阅读说明：本技术 显示装置 (Display device ) 是由 朴度昤 金璟陪 朴鲁卿 于 2021-02-23 设计创作，主要内容包括：一种显示装置包括：子像素,子像素包括在第一方向上彼此相邻并且交替且重复地设置的多个第一类型子像素和多个第二类型子像素；多个电极,每个电极包括被布置在子像素中的每一个中并在第二方向上延伸的电极主干部分以及连接到电极主干部分并被布置于在第一方向相邻的另一子像素之上的至少一个电极突出部分；多个发光元件,多个发光元件具有在一个方向上延伸的形状,并且被布置在一个电极的电极主干部分和另一电极的电极突出部分上；以及接触发光元件的第一端的多个第一接触电极和接触发光元件的第二端的多个第二接触电极。(A display device includes: a sub-pixel including a plurality of first type sub-pixels and a plurality of second type sub-pixels adjacent to each other in a first direction and alternately and repeatedly disposed; a plurality of electrodes, each electrode including an electrode stem portion arranged in each of the sub-pixels and extending in the second direction and at least one electrode protrusion portion connected to the electrode stem portion and arranged over another sub-pixel adjacent in the first direction; a plurality of light emitting elements having a shape extending in one direction and arranged on the electrode stem portion of one electrode and the electrode protruding portion of the other electrode; and a plurality of first contact electrodes contacting the first ends of the light emitting elements and a plurality of second contact electrodes contacting the second ends of the light emitting elements.)

1. A display device, comprising:

a sub-pixel including a plurality of first-type sub-pixels and a plurality of second-type sub-pixels adjacent to each other in a first direction and alternately and repeatedly disposed;

a plurality of electrodes, each electrode including an electrode stem portion arranged in each of the sub-pixels and extending in a second direction, and at least one electrode protrusion portion connected to the electrode stem portion and arranged over another sub-pixel adjacent in the first direction;

a plurality of light emitting elements having a shape extending in one direction and arranged on the electrode stem portion of one electrode and the electrode protruding portion of the other electrode; and

A plurality of first contact electrodes contacting a first end of the light emitting element and a plurality of second contact electrodes contacting a second end of the light emitting element,

wherein the light emitting elements include a first type light emitting element and a second type light emitting element, the first type light emitting element is arranged in each of the first type sub-pixels and the first end of the first type light emitting element is arranged on the electrode trunk portion, the second type light emitting element is arranged in each of the second type sub-pixels and the first end of the second type light emitting element is arranged on the electrode protruding portion, and

the first end of the first type light emitting element and the first end of the second type light emitting element face opposite directions.

2. The display device according to claim 1, wherein the plurality of electrodes include a first electrode and a second electrode, the electrode stem portion of the first electrode is arranged in each of the first-type sub-pixels, the electrode stem portion of the second electrode is arranged in each of the second-type sub-pixels,

Wherein the electrode protrusion portion of the first electrode is spaced apart from the electrode stem portion of the second electrode in each of the second-type sub-pixels, and

the electrode protrusion portion of the second electrode is spaced apart from the electrode stem portion of the first electrode in each of the first type sub-pixels.

3. The display device according to claim 2,

of the plurality of first contact electrodes, a first contact electrode arranged in each of the first-type sub-pixels is arranged on the electrode trunk portion of the first electrode, and a first contact electrode arranged in each of the second-type sub-pixels is arranged on the electrode protrusion portion of the first electrode, and

among the plurality of second contact electrodes, a second contact electrode disposed in each of the first-type sub-pixels is disposed on the electrode protruding portion of the second electrode, and a second contact electrode disposed in each of the second-type sub-pixels is disposed on the electrode trunk portion of the second electrode.

4. The display device according to claim 3, wherein each of the first contact electrodes directly contacts the first electrode, and each of the second contact electrodes does not contact the second electrode.

5. The display device according to claim 2, further comprising a plurality of electrode contact portions, each electrode contact portion being arranged in each of the first-type sub-pixels and the second-type sub-pixels and spaced apart from the first electrodes and the second electrodes.

6. The display device according to claim 5, wherein each of the first contact electrode and the second contact electrode includes a portion extending in the second direction, and

each of the second contact electrodes further includes a portion contacting each of the electrode contact portions.

7. The display device according to claim 6, wherein a first power supply voltage is applied to each of the electrode contact portions,

a second power supply voltage is applied to the first electrode,

the first power supply voltage is transmitted to the second terminal of the light emitting element through each of the second contact electrodes, and

The second power supply voltage is transmitted to the first terminal of the light emitting element through each of the first contact electrodes.

8. The display device according to claim 2, wherein the at least one electrode protrusion portion includes a first electrode protrusion portion protruding toward a first side of the first direction and a second electrode protrusion portion protruding toward a second side of the first direction,

wherein the first electrode protruding portion of the first electrode is spaced apart from the electrode trunk portion of the second electrode in each of the second-type sub-pixels,

the second electrode protruding portion of the second electrode is spaced apart from the electrode trunk portion of the first electrode in each of the first type sub-pixels, and

the first electrode protruding portion of the first electrode is spaced apart from the second electrode protruding portion of the second electrode in the second direction.

9. The display device according to claim 8, wherein the first type light-emitting element comprises a first light-emitting element and a second light-emitting element, the second end of the first light-emitting element is arranged on the first electrode protruding portion of the second electrode, and the second end of the second light-emitting element is arranged on the second electrode protruding portion of the second electrode, and

The second type light emitting elements include a third light emitting element and a fourth light emitting element, the first end of the third light emitting element is disposed on the first electrode protrusion portion of the first electrode, and the first end of the fourth light emitting element is disposed on the second electrode protrusion portion of the first electrode.

10. The display device according to claim 9, wherein the first contact electrode arranged in each of the first-type sub-pixels is arranged on the electrode trunk portion of the first electrode and contacts the first end of the second light-emitting element,

the second contact electrode arranged in each of the first type sub-pixels is arranged on the first electrode protruding portion of the second electrode and contacts the second end of the first light emitting element, and

the display device further includes a third contact electrode arranged to contact the first end of the first light emitting element and the second end of the second light emitting element.

11. The display device according to claim 10, wherein the third contact electrode is arranged over the electrode trunk portion of the first electrode and the second electrode protruding portion of the second electrode.

12. The display device according to claim 9, wherein the at least one electrode protrusion further comprises a third electrode protrusion protruding toward the first side of the first direction,

the first type light emitting element further includes a fifth light emitting element, the second end of the fifth light emitting element is disposed on the third electrode protrusion portion of the second electrode, and

the second type light emitting element further includes a sixth light emitting element, the first end of the sixth light emitting element being disposed on the third electrode protrusion portion of the first electrode.

13. The display device according to claim 12, wherein the first contact electrode arranged in each of the first-type sub-pixels is arranged on the electrode trunk portion of the first electrode and contacts the first end of the fifth light-emitting element,

the second contact electrode arranged in each of the first type sub-pixels is arranged on the first electrode protruding portion of the second electrode and contacts the second end of the first light emitting element, and

the display device further includes a third contact electrode arranged to contact the first end of the first light emitting element and the second end of the second light emitting element, and a fourth contact electrode arranged to contact the first end of the second light emitting element and the second end of the fifth light emitting element.

14. A display device, comprising:

a plurality of first sub-pixels and a plurality of second sub-pixels adjacent to each other in a first direction and alternately and repeatedly disposed;

a first electrode including a first electrode trunk portion arranged in each of the first sub-pixels and extending in a second direction, a first electrode facing portion arranged in each of the second sub-pixels and extending in the second direction, and an electrode connecting portion connecting the first electrode trunk portion and the first electrode facing portion;

a second electrode including a second electrode trunk portion arranged in each of the second sub-pixels and extending in the second direction, a second electrode facing portion arranged in each of the first sub-pixels and extending in the second direction, and an electrode separating portion connected to but separated from the second electrode facing portion;

a plurality of light emitting elements having first ends disposed on the first electrode and second ends disposed on the second electrode; and

A plurality of first contact electrodes disposed on the first electrodes and contacting the first ends of the light emitting elements, and a plurality of second contact electrodes disposed on the second electrodes and contacting the second ends of the light emitting elements,

wherein the light emitting element includes a first light emitting element and a second light emitting element, the first light emitting element is disposed in each of the first sub-pixels, the first end of the first light emitting element is disposed on the first electrode trunk portion, and the second end of the first light emitting element is disposed on the second electrode facing portion, the second light emitting element is disposed in each of the second sub-pixels, the first end of the second light emitting element is disposed on the first electrode facing portion, and the second end of the second light emitting element is disposed on the second electrode trunk portion.

15. The display device according to claim 14,

of the plurality of first contact electrodes, a first contact electrode arranged in each of the first sub-pixels is arranged on the first electrode trunk portion, and a first contact electrode arranged in each of the second sub-pixels is arranged on the first electrode facing portion, and

Among the plurality of second contact electrodes, a second contact electrode disposed in each of the first sub-pixels is disposed on the second electrode facing portion, and a second contact electrode disposed in each of the second sub-pixels is disposed on the second electrode trunk portion.

16. The display device according to claim 15, wherein each of the first contact electrodes directly contacts the first electrode trunk portion or the first electrode facing portion, and

each of the second contact electrodes directly contacts the second electrode trunk portion or the second electrode facing portion.

17. The display device according to claim 14, wherein the first electrode includes a plurality of electrode connection portions and a plurality of first electrode facing portions, the plurality of electrode connection portions are respectively connected to first and second sides of the first electrode stem portion in the first direction, the plurality of first electrode facing portions are respectively connected to the electrode connection portions and are respectively arranged at the first and second sides of the first electrode stem portion in the first direction, and

The second electrode includes a plurality of second electrode facing portions that are respectively arranged on first and second sides of the second electrode stem portion in the first direction and are spaced apart from the second electrode stem portion.

18. The display device according to claim 17, wherein the light-emitting element further comprises a third light-emitting element arranged in each of the first sub-pixels, and the first end of the third light-emitting element is arranged on the first electrode trunk portion, and the second end of the third light-emitting element is arranged on the second electrode facing portion arranged on the second side of the second electrode trunk portion in the first direction.

19. The display device according to claim 18, further comprising a third contact electrode arranged to contact the first end of the first light-emitting element and the second end of the third light-emitting element.

20. The display device according to claim 19, wherein the third contact electrode directly contacts the second electrode facing portion arranged on the second side of the second electrode trunk portion in the first direction.

Technical Field

The technical field relates to a display device.

Background

The display device may display an image according to an input signal. Modern display devices include light emitting display devices and liquid crystal display devices.

A light emitting display device generally includes a light emitting display panel. The light emitting display panel may include light emitting elements such as Light Emitting Diodes (LEDs). The LED may be an Organic Light Emitting Diode (OLED) including an organic fluorescent material, or may be an inorganic LED including an inorganic fluorescent material.

Disclosure of Invention

Embodiments may relate to an inorganic light emitting element display device including an electrode structure configured to prevent a potential short circuit between wirings and/or to maximize an emission area per pixel.

According to an embodiment, a display device includes: a sub-pixel including a plurality of first type sub-pixels and a plurality of second type sub-pixels adjacent to each other in a first direction and alternately and repeatedly disposed; a plurality of electrodes, each electrode including an electrode stem portion arranged in each of the sub-pixels and extending in the second direction and at least one electrode protrusion portion connected to the electrode stem portion and arranged over another sub-pixel adjacent in the first direction; a plurality of light emitting elements having a shape extending in one direction and arranged on the electrode stem portion of one electrode and the electrode protruding portion of the other electrode; and a plurality of first contact electrodes contacting first ends of the light emitting elements and a plurality of second contact electrodes contacting second ends of the light emitting elements, wherein the light emitting elements include first type light emitting elements and second type light emitting elements, the first type light emitting elements are arranged in each of the first type sub-pixels, and first ends of the first type light emitting elements are arranged on the electrode trunk portions, the second type light emitting elements are arranged in each of the second type sub-pixels, and first ends of the second type light emitting elements are arranged on the electrode protrusion portions, and the first ends of the first type light emitting elements and the first ends of the second type light emitting elements face opposite directions.

The plurality of electrodes may include a first electrode and a second electrode, the electrode stem portion of the first electrode being disposed in each of the first type sub-pixels, the electrode stem portion of the second electrode being disposed in each of the second type sub-pixels, wherein the electrode protrusion portion of the first electrode may be spaced apart from the electrode stem portion of the second electrode in each of the second type sub-pixels, and the electrode protrusion portion of the second electrode may be spaced apart from the electrode stem portion of the first electrode in each of the first type sub-pixels.

Among the plurality of first contact electrodes, the first contact electrode disposed in each of the first-type sub-pixels may be disposed on an electrode trunk portion of the first electrode, the first contact electrode disposed in each of the second-type sub-pixels may be disposed on an electrode protrusion portion of the first electrode, and among the plurality of second contact electrodes, the second contact electrode disposed in each of the first-type sub-pixels may be disposed on an electrode protrusion portion of the second electrode, and the second contact electrode disposed in each of the second-type sub-pixels may be disposed on an electrode trunk portion of the second electrode.

Each of the first contact electrodes may directly contact the first electrode, and each of the second contact electrodes may not contact the second electrode.

The display device may further include a plurality of electrode contact portions, each of which is disposed in each of the first and second type sub-pixels and spaced apart from the first and second electrodes.

Each of the first and second contact electrodes may include a portion extending in the second direction, and each of the second contact electrodes may further include a portion contacting each of the electrode contact portions.

A first power supply voltage may be applied to each of the electrode contact portions, a second power supply voltage may be applied to the first electrode, the first power supply voltage may be transmitted to the second terminal of the light emitting element through each of the second contact electrodes, and the second power supply voltage may be transmitted to the first terminal of the light emitting element through each of the first contact electrodes.

The at least one electrode protrusion may include a first electrode protrusion protruding toward a first side of the first direction and a second electrode protrusion protruding toward a second side of the first direction, wherein the first electrode protrusion of the first electrode may be spaced apart from the electrode stem portion of the second electrode in each of the second type sub-pixels, the second electrode protrusion of the second electrode may be spaced apart from the electrode stem portion of the first electrode in each of the first type sub-pixels, and the first electrode protrusion of the first electrode may be spaced apart from the second electrode protrusion of the second electrode in the second direction.

The first type light emitting element may include a first light emitting element and a second light emitting element, a second end of the first light emitting element is disposed on the first electrode protrusion portion of the second electrode, a second end of the second light emitting element is disposed on the second electrode protrusion portion of the second electrode, and the second type light emitting element may include a third light emitting element and a fourth light emitting element, a first end of the third light emitting element is disposed on the first electrode protrusion portion of the first electrode, and a first end of the fourth light emitting element is disposed on the second electrode protrusion portion of the first electrode.

The first contact electrode disposed in each of the first type sub-pixels may be disposed on the electrode trunk portion of the first electrode and contact the first end of the second light emitting element, the second contact electrode disposed in each of the first type sub-pixels may be disposed on the first electrode protrusion portion of the second electrode and contact the second end of the first light emitting element, and the display device may further include a third contact electrode disposed to contact the first end of the first light emitting element and the second end of the second light emitting element.

The third contact electrode may be disposed over the electrode stem portion of the first electrode and the second electrode protrusion portion of the second electrode.

The at least one electrode protrusion may further include a third electrode protrusion protruding toward the first side of the first direction, the first type light emitting element may further include a fifth light emitting element of which a second end is disposed on the third electrode protrusion of the second electrode, and the second type light emitting element may further include a sixth light emitting element of which a first end is disposed on the third electrode protrusion of the first electrode.

The first contact electrode disposed in each of the first type sub-pixels may be disposed on the electrode trunk portion of the first electrode and contact the first end of the fifth light emitting element, the second contact electrode disposed in each of the first type sub-pixels may be disposed on the first electrode protrusion portion of the second electrode and contact the second end of the first light emitting element, and the display device may further include a third contact electrode disposed to contact the first end of the first light emitting element and the second end of the second light emitting element and a fourth contact electrode disposed to contact the first end of the second light emitting element and the second end of the fifth light emitting element.

According to an embodiment, a display device includes: a plurality of first and second sub-pixels adjacent to each other in a first direction and alternately and repeatedly disposed; a first electrode including a first electrode trunk portion arranged in each of the first sub-pixels and extending in the second direction, a first electrode facing portion arranged in each of the second sub-pixels and extending in the second direction, and an electrode connecting portion connecting the first electrode trunk portion and the first electrode facing portion; a second electrode including a second electrode trunk portion arranged in each of the second sub-pixels and extending in the second direction, a second electrode facing portion arranged in each of the first sub-pixels and extending in the second direction, and an electrode separating portion connected to the second electrode facing portion but separated from the second electrode trunk portion; a plurality of light emitting elements having first ends disposed on the first electrodes and second ends disposed on the second electrodes; and a plurality of first contact electrodes disposed on the first electrodes and contacting first ends of the light emitting elements, and a plurality of second contact electrodes disposed on the second electrodes and contacting second ends of the light emitting elements, wherein the light emitting elements include first light emitting elements disposed in each of the first sub-pixels and second light emitting elements disposed in each of the second sub-pixels, first ends of the first light emitting elements are disposed on the first electrode trunk portions, and second ends of the first light emitting elements are disposed on the second electrode facing portions, first ends of the second light emitting elements are disposed on the first electrode facing portions, and second ends of the second light emitting elements are disposed on the second electrode trunk portions.

The first contact electrode disposed in each of the first sub-pixels may be disposed on the first electrode trunk portion, the first contact electrode disposed in each of the second sub-pixels may be disposed on the first electrode facing portion, the second contact electrode disposed in each of the first sub-pixels may be disposed on the second electrode facing portion, and the second contact electrode disposed in each of the second sub-pixels may be disposed on the second electrode trunk portion.

Each of the first contact electrodes may directly contact the first electrode stem portion or the first electrode facing portion, and each of the second contact electrodes may directly contact the second electrode stem portion or the second electrode facing portion.

The first electrode may include a plurality of electrode connection portions connected to first and second sides of the first electrode stem portion in the first direction, respectively, and a plurality of first electrode facing portions connected to the electrode connection portions, respectively, and disposed at the first and second sides of the first electrode stem portion in the first direction, respectively, and the second electrode may include a plurality of second electrode facing portions disposed at the first and second sides of the second electrode stem portion in the first direction, respectively, and spaced apart from the second electrode stem portion.

The light emitting element may further include a third light emitting element disposed in each of the first sub-pixels, a first end of the third light emitting element being disposed on the first electrode trunk portion, and a second end of the third light emitting element being disposed on the second electrode facing portion disposed on a second side of the second electrode trunk portion in the first direction.

The display device may further include a third contact electrode arranged to contact the first end of the first light emitting element and the second end of the third light emitting element.

The third contact electrode may directly contact the second electrode facing portion disposed at a second side of the second electrode stem portion in the first direction.

Embodiments may relate to a display device. The display device may include a first electrode, a second electrode, a first light emitting element, and a second light emitting element. The first electrode may include a first stem and a first protrusion protruding from the first stem in a first direction. The second electrode may include a second stem and a second protrusion protruding from the second stem in the first direction. The first light emitting element may include a first electrode portion and a first semiconductor portion spaced apart from each other. The first semiconductor portion may overlap the first stem. The first electrode part may be spaced apart from the first stem in a plan view of the display device. The second light emitting element may include a second electrode portion and a second semiconductor portion spaced apart from each other. The second electrode portion may overlap the second stem. The second semiconductor portion may overlap the first protrusion.

A portion of the second semiconductor portion may be located between the first protrusion and the second stem.

The display device may include a first contact electrode overlapping the first stem and directly contacting at least one of the first stem and the first light emitting element.

The display device may include a second contact electrode spaced apart from the first contact electrode and directly contacting the first light emitting element.

The display device may include a first electrode contact portion electrically connected to the first light emitting element and spaced apart from the first electrode.

The first electrode contact portion may be electrically connected to the first light emitting element through the second contact electrode.

The first power voltage may be applied to the first electrode part through the first electrode contact part. The second power supply voltage may be applied to the first semiconductor portion through the first electrode.

The display device may include a third light emitting element. The third light emitting element may include a third electrode portion and a third semiconductor portion spaced apart from each other. The first electrode may include a third protrusion protruding from the first stem. The first stem may be located between the first protrusion and the third protrusion in the first direction. The third semiconductor portion may overlap the first stem. The third electrode portion may be spaced apart from the first electrode in a plan view of the display device.

The second electrode may include a fourth protrusion protruding from the second stem. The second stem may be located between the second protrusion and the fourth protrusion in the first direction. The third electrode portion may overlap the fourth protrusion.

The display device may include a contact electrode directly contacting each of the first semiconductor portion and the third electrode portion.

The contact electrode may overlap each of the first stem and the fourth protrusion.

The display device may include a fourth light emitting element. The fourth light emitting element may include a fourth electrode portion and a fourth semiconductor portion spaced apart from each other. The first electrode may include a fifth protrusion protruding from the first stem. The first stem may be located between the third protrusion and the fifth protrusion in the first direction. The third protrusion may be located between the first protrusion and the fifth protrusion in a second direction different from the first direction. The fourth semiconductor portion may overlap the fifth protrusion.

The display device may include a contact electrode. The contact electrode may be spaced apart from the first stem, may partially overlap the fifth protrusion, and may directly contact the fourth semiconductor portion.

Embodiments may relate to a display device. The display device may include the following elements: a first trunk electrode; a first connection electrode spaced apart from the first trunk electrode in a first direction and shorter than the first trunk electrode in a second direction different from the first direction; a first intermediate electrode located between the first trunk electrode and the first connection electrode and directly connected to each of the first trunk electrode and the first connection electrode; a second trunk electrode; a second connection electrode spaced apart from the second trunk electrode in the first direction and shorter than the second trunk electrode in the second direction; a second intermediate electrode positioned between the second trunk electrode and the second connection electrode, spaced apart from the second trunk electrode, and directly connected to the second connection electrode; a first light emitting element including a first electrode portion and a first semiconductor portion spaced apart from each other, wherein the first semiconductor portion may overlap the first trunk electrode, and wherein the first electrode portion may be spaced apart from the first trunk electrode in a plan view of the display device; and a second light emitting element including a second electrode portion and a second semiconductor portion spaced apart from each other, wherein the second electrode portion may overlap the second trunk electrode, and wherein the second semiconductor portion may overlap the first connection electrode.

The display device may include the following elements: a first contact electrode spaced apart from the first connection electrode, overlapping the first trunk electrode, and directly contacting the first semiconductor portion in a plan view of the display device; and a second contact electrode spaced apart from each of the first and second connection electrodes, overlapping the second trunk electrode, and directly contacting the second electrode portion.

The first contact electrode may directly contact the first trunk electrode. The second contact electrode may directly contact the second stem electrode.

The display device may include a third light emitting element and a first contact electrode. The third light emitting element may include a third electrode portion and a third semiconductor portion spaced apart from each other. The third semiconductor portion may overlap the first trunk electrode. The third electrode portion may be spaced apart from the first stem electrode in a plan view of the display device. In a plan view of the display device, the first contact electrode may be spaced apart from the first light emitting element, may overlap the first trunk electrode, and may directly contact the third semiconductor portion.

The display device may include the following elements: a third connection electrode spaced apart from the first trunk electrode in the first direction and shorter than the first trunk electrode in the second direction, wherein the first electrode portion may overlap the third connection electrode; and a second contact electrode spaced apart from the first trunk electrode, overlapping the third connection electrode, and directly contacting the first electrode portion in a plan view of the display device.

The display device may include a third contact electrode spaced apart from the first contact electrode, overlapping the first trunk electrode, directly contacting the first semiconductor portion, and directly contacting the third electrode portion.

The display device may include the following elements: a third intermediate electrode directly connected to the first trunk electrode, wherein the first trunk electrode may be located between the first intermediate electrode and the third intermediate electrode in the first direction; a fourth connection electrode located between the first trunk electrode and the second trunk electrode and shorter than the second trunk electrode, wherein the third electrode portion overlaps the fourth connection electrode; and a fourth intermediate electrode between the fourth connection electrode and the second trunk electrode, directly connected to the fourth connection electrode, and spaced apart from the second trunk electrode, wherein the third contact electrode may overlap the fourth connection electrode and directly contact the fourth connection electrode.

Drawings

Fig. 1 is a plan view of a display device according to an embodiment.

Fig. 2 is a plan view of a pixel of a display device according to an embodiment.

Fig. 3 is a plan view of a first sub-pixel and a second sub-pixel of a display device according to an embodiment.

Fig. 4 is a cross-sectional view taken along lines Q1-Q1 ', Q2-Q2 ', and Q3-Q3 ' of fig. 2, under an embodiment.

Fig. 5 is a schematic (perspective) view of a light emitting element according to an embodiment.

Fig. 6 and 7 are plan views illustrating some operations in a process of manufacturing a display device according to an embodiment.

Fig. 8 is a plan view of a pixel of a display device according to an embodiment.

Fig. 9 is a cross-sectional view of a display device according to an embodiment.

Fig. 10 is a plan view of a pixel of a display device according to an embodiment.

Fig. 11 is a plan view illustrating an operation in a process of manufacturing the display device of fig. 10 according to an embodiment.

Fig. 12 is a plan view of a pixel of a display device according to an embodiment.

Fig. 13 is a plan view of a first type sub-pixel and a second type sub-pixel of the display device of fig. 12 according to an embodiment.

Fig. 14 is a plan view illustrating an operation in a process of manufacturing the display device of fig. 12 according to an embodiment.

Fig. 15 is a plan view of a pixel of a display device according to an embodiment.

Fig. 16 is a plan view of a pixel of a display device according to an embodiment.

Fig. 17 is a plan view of a pixel of a display device according to an embodiment.

Fig. 18 is a plan view of a pixel of a display device according to an embodiment.

Fig. 19 is a plan view of a pixel of a display device according to an embodiment.

Fig. 20 is a plan view of a pixel of a display device according to an embodiment.

Fig. 21 is a plan view of a pixel of a display device according to an embodiment.

Detailed Description

Example embodiments are described with reference to the drawings. The actual embodiments may be embodied in different forms and should not be construed as limited to the example embodiments.

Although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used to distinguish one element from another. For example, a first element discussed below could be termed a second element without departing from the teachings of the present disclosure. Similarly, a second element may also be referred to as a first element. The description of an element as a "first" element may not require or imply the presence of a second element or other elements. The terms "first," "second," and the like may be used to distinguish different classes or groups of elements. For brevity, the terms "first", "second", etc. may denote "a first type (or first group)", "a second type (or second group)" etc. respectively.

The term "connected" may mean "electrically connected" or "not electrically connected through an intermediate transistor". The term "insulating" may refer to "electrical insulation" or "electrical isolation". The term "electrically conductive" may refer to "electrically conductive". The term "driving" may refer to "operation" or "control". The term "extending" may refer to "protruding".

Fig. 1 is a schematic plan view of a display device 10 according to an embodiment.

The display device 10 may display moving images or still images. The display device 10 may represent an electronic device including a display screen. Examples of the display device 10 may include a television, a notebook computer, a monitor, a billboard, an internet of things (IoT), a mobile phone, a smart phone, a tablet Personal Computer (PC), an electronic watch, a smart watch, a watch phone, a head-mounted display, a mobile communication terminal, an electronic notebook, an electronic book, a Portable Multimedia Player (PMP), a navigation device, a game machine, a digital camera, and a camcorder.

The display device 10 includes a display panel that provides a display screen. Examples of the display panel include an inorganic Light Emitting Diode (LED) display panel, an organic light emitting display panel, a quantum dot light emitting display panel, a plasma display panel, and a field emission display panel. Inorganic LED display panels are described as examples.

Various modifications may be made to the shape of the display device 10. For example, the display device 10 may have various shapes such as a horizontally long rectangle, a vertically long rectangle, a square, a quadrangle having rounded corners (top corners), other polygons, and a circle. The shape of the display area DPA of the display device 10 may also be similar to the overall shape of the display device 10. In fig. 1, each of the display device 10 and the display area DPA is shaped like a horizontally long rectangle.

The display device 10 may include a display area DPA and a non-display area NDA. The display area DPA may be an area capable of displaying a screen, and the non-display area NDA may be an area where a screen is not displayed. The display area DPA may also be referred to as an effective area, and the non-display area NDA may also be referred to as an ineffective area. The display area DPA may generally occupy the center of the display apparatus 10.

The display area DPA may include a plurality of pixels PX. The pixels PX may be arranged in a matrix form. In the plan view of the display region DPA, each of the pixels PX may be rectangular or square. Each of the pixels PX may also have a rhomboid planar shape having sides inclined with respect to a direction. The pixels PX may be alternately arranged in a stripe or honeycomb (TM) configuration. Each of the pixels PX may include one or more light emitting elements ED (see fig. 2) emitting light of a specific wavelength band to display a specific color.

The non-display area NDA may be disposed around the display area DPA. The non-display area NDA may completely or partially surround the display area DPA. The display area DPA may be rectangular, and the non-display area NDA may be disposed adjacent to four sides of the display area DPA. The non-display area NDA may form a bezel of the display device 10. In each non-display area NDA, a wiring or a circuit driver included in the display device 10 may be arranged, or an external device may be mounted.

Fig. 2 is a plan view of a pixel PX of the display device 10 according to the embodiment.

Referring to fig. 2, each of the pixels PX may include a plurality of subpixels PXn (where n is an integer of 1 to 3). For example, one pixel PX may include a first sub-pixel PX1, a second sub-pixel PX2, and a third sub-pixel PX 3. The first sub-pixel PX1 may emit light of a first color, the second sub-pixel PX2 may emit light of a second color, and the third sub-pixel PX3 may emit light of a third color. For example, the first color may be blue, the second color may be green, and the third color may be red. The subpixels PXn may emit the same color light. The pixel PX may include more subpixels PXn.

Each subpixel PXn of the display apparatus 10 may include an emission area EMA and a non-emission area (not shown). The emission region EMA may be a region in which the light emitting elements ED are arranged to output light of a specific wavelength band, and the non-emission region may be a region in which the light emitting elements ED are not arranged and light is not output therefrom because light emitted from the light emitting elements ED does not reach the region. The emission region EMA may include a region in which the light emitting element ED is arranged and in which light emitted from the light emitting element ED is output to a region adjacent to the light emitting element ED.

The emission region EMA may include a region from which light emitted from the light emitting element ED is output after being reflected or refracted by other members. A plurality of light emitting elements ED may be arranged in each subpixel PXn, and a region in which the light emitting elements ED are arranged and a region adjacent to the region may form the emission region EMA.

Each subpixel PXn may include a cutting area CBA disposed in the non-emission area. The cutting region CBA may be disposed on one side of the emission region EMA in the second direction DR 2. The cutting regions CBA may be arranged between the emission regions EMA of the subpixels PXn adjacent to each other in the second direction DR 2. That is, a plurality of emission regions EMA and a plurality of cutting regions CBA may be disposed in the display region DPA of the display device 10. For example, the emission regions EMA and the cutting regions CBA may be repeatedly disposed in the first direction DR1, but may be alternately disposed in the second direction DR 2. The second bank BNL2 may be arranged between the cutting region CBA and the emission region EMA, and the gap between the cutting region CBA and the emission region EMA may vary according to the width of the second bank BNL 2. Since the light emitting element ED is not arranged in the cutting area CBA, light may not be output from the cutting area CBA, but a part of the electrode RME arranged in each sub-pixel PXn may be arranged in the cutting area CBA. The electrodes RME arranged in some of the subpixels PXn may be separated from each other in the cutting area CBA. The electrodes RME may not be separated from each other in the cutting region CBA.

Fig. 3 is a plan view of the first sub-pixel PX1 and the second sub-pixel PX2 of fig. 2. FIG. 4 is a cross-sectional view taken along lines Q1-Q1 ', Q2-Q2 ', and Q3-Q3 ' of FIG. 2. Fig. 4 illustrates a cross section across one end and the other end of the light emitting element ED arranged in the third sub-pixel PX 3.

Referring to fig. 3 and 4 in conjunction with fig. 2, the display device 10 may include a first substrate 11, and a semiconductor layer, a plurality of conductive layers, and a plurality of insulating layers disposed on the first substrate 11. The semiconductor layer, the conductive layer, and the insulating layer may constitute a circuit layer and a light emitting element layer of the display device 10.

Specifically, the first substrate 11 may be an insulating substrate. The first substrate 11 may be made of an insulating material such as glass, quartz, or polymer resin. In addition, the first substrate 11 may be a rigid substrate, but may also be a flexible substrate that can be bent, folded, and rolled.

The light shielding layer BML may be disposed on the first substrate 11. The light-shielding layer BML overlaps the active layer ACT1 of the first transistor T1 of the display device 10. The light shielding layer BML may include a light shielding material for preventing light from entering the active layer ACT1 of the first transistor T1. For example, the light blocking layer BML may be made of an opaque metal material that blocks light transmission. The light shielding layer BML may be optional.

The buffer layer 12 may be disposed on the entire surface of the first substrate 11 having the light-shielding layer BML. The buffer layer 12 may be formed on the first substrate 11 to protect the first transistor T1 of the pixel PX from moisture introduced through the first substrate 11, which is vulnerable to moisture penetration, and may perform a surface planarization function. The buffer layer 12 may be composed of a plurality of inorganic layers alternately stacked. For example, the buffer layer 12 may be a silicon oxide (SiO) layer including silicon oxide therein_x) Silicon nitride (SiN)_x) And silicon oxynitride (SiO)_xN_y) A plurality of layers in which inorganic layers of at least one of (are alternately) stacked.

The semiconductor layer is disposed on the buffer layer 12. The semiconductor layer may include the active layer ACT1 of the first transistor T1. The active layer ACT1 may partially overlap with the gate electrode G1 of the first gate conductive layer.

The display device 10 may also comprise further transistors. For example, the display apparatus 10 may include two or three transistors by including one or more transistors other than the first transistor T1 in each subpixel PXn.

The semiconductor layer may include polycrystalline silicon, single crystal silicon, an oxide semiconductor, or the like. When the semiconductor layer includes an oxide semiconductor, each active layer ACT1 may include a plurality of conductive regions ACTa and ACTb and a channel region ACTc disposed between the plurality of conductive regions ACTa and ACTb. The oxide semiconductor may be an oxide semiconductor containing indium (In). For example, the oxide semiconductor may be Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), Indium Gallium Oxide (IGO), Indium Zinc Tin Oxide (IZTO), Indium Gallium Tin Oxide (IGTO), or Indium Gallium Zinc Tin Oxide (IGZTO).

In an embodiment, the semiconductor layer may include polysilicon. The polycrystalline silicon may be formed by crystallizing amorphous silicon. In this case, each of the conductive regions ACTa and ACTb of the active layer ACT1 may be a doped region doped with impurities.

The first gate insulating layer 13 is disposed on the semiconductor layer and the buffer layer 12. The first gate insulating layer 13 may be disposed on the buffer layer 12 having the semiconductor layer. The first gate insulating layer 13 may function as a gate insulating film of each transistor. The first gate insulating layer 13 may be a layer including, for example, silicon oxide (SiO)_x) Silicon nitride (SiN)_x) Or silicon oxynitride (SiO)_xN_y) Or may have a structure in which the above materials are stacked.

The first gate conductive layer is disposed on the first gate insulating layer 13. The first gate conductive layer may include the gate electrode G1 of the first transistor T1 and the first capacitance electrode CSE1 of the storage capacitor. The gate electrode G1 may overlap the channel region ACTc of the active layer ACT1 in the thickness direction. The first capacitance electrode CSE1 may overlap with a second capacitance electrode CSE2, which will be described later, in the thickness direction. In an embodiment, the first capacitance electrode CSE1 may be integrally connected to the gate electrode G1. The first capacitance electrode CSE1 may overlap the second capacitance electrode CSE2, and a storage capacitor may be formed therebetween.

The first gate conductive layer may be a single layer structure or a multi-layer structure made of one or more of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), copper (Cu), and an alloy of some of these metals, or include one or more of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), copper (Cu), and an alloy of some of these metals.

The first interlayer insulating layer 15 is disposed on the first gate conductive layer. The first interlayer insulating layer 15 may function as an insulating film between the first gate conductive layer and other layers disposed on the first gate conductive layer. The first interlayer insulating layer 15 may cover and protect the first gate conductive layer. The first interlayer insulating layer 15 may be a layer including, for example, silicon oxide (SiO)_x) Silicon nitride (SiN)_x) Or silicon oxynitride (SiO)_xN_y) Or may have a structure in which the above materials are stacked.

The first data conductive layer is disposed on the first interlayer insulating layer 15. The first data conductive layer may include the first source electrode S1 and the first drain electrode D1 of the first transistor T1, the data line DTL, and the second capacitance electrode CSE 2.

The first source electrode S1 and the first drain electrode D1 of the first transistor T1 may contact the conductive regions ACTa and ACTb of the active layer ACT1, respectively, through contact holes penetrating the first interlayer insulating layer 15 and the first gate insulating layer 13. The first source electrode S1 of the first transistor T1 may be electrically connected to the light-shielding layer BML through another contact hole.

The data line DTL may transmit a data signal to other transistors (not shown) included in the display device 10. Although not illustrated in the drawings, the data line DTL may be connected to source/drain electrodes of other transistors and may transmit a received signal to the source/drain electrodes.

The second capacitance electrode CSE2 overlaps the first capacitance electrode CSE1 in the thickness direction. In an embodiment, the second capacitive electrode CSE2 may be integrally connected to the first source electrode S1.

The first data conductive layer may be a single-layer structure or a multi-layer structure made of one or more of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), copper (Cu), and an alloy of some of these metals, or include one or more of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), copper (Cu), and an alloy of some of these metals.

The second interlayer insulating layer 17 is disposed on the first data conductive layer. The second interlayer insulating layer 17 may function as an insulating film between the first data conductive layer and other layers disposed on the first data conductive layer. The second interlayer insulating layer 17 may cover and protect the first data conductive layer. The second interlayer insulating layer 17 may be a layer including, for example, silicon oxide (SiO) _x) Silicon nitride (SiN)_x) Or silicon oxynitride (SiO)_xN_y) Or may have a structure in which the above materials are stacked.

The second data conductive layer is disposed on the second interlayer insulating layer 17. The second data conductive layer may include the first voltage wiring VL1, the second voltage wiring VL2, and the first conductive pattern CDP. A high potential voltage (or a first power supply voltage) supplied to the first transistor T1 may be applied to the first voltage wiring VL1, and a low potential voltage (or a second power supply voltage) supplied to the first electrode RME1 may be applied to the second voltage wiring VL 2. An alignment signal required to align the light emitting elements ED may be transmitted to the second voltage wiring VL2 during the manufacturing process of the display device 10.

The first conductive pattern CDP may be connected to the second capacitor electrode CSE2 through a contact hole formed in the second interlayer insulating layer 17. The second capacitor electrode CSE2 may be integral with the first source electrode S1 of the first transistor T1, and the first conductive pattern CDP may be electrically connected to the first source electrode S1. The first conductive pattern CDP may also contact an electrode RME to be described later, and the first transistor T1 may transmit the first power supply voltage received from the first voltage wiring VL1 to the second electrode RME2 through the first conductive pattern CDP. The second data conductive layer may include more first voltage wiring VL1 and more second voltage wiring VL 2.

The second data conductive layer may be a single-layer structure or a multi-layer structure made of one or more of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), copper (Cu), and an alloy of some of these metals, or include one or more of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), copper (Cu), and an alloy of some of these metals.

The first planarization layer 19 is disposed on the second data conductive layer. The first planarization layer 19 may include an organic insulating material such as Polyimide (PI) and perform a surface planarization function.

The plurality of first banks BNL1, the plurality of electrodes RME, the light emitting element ED, the plurality of contact electrodes CNE1 and CNE2, and the second bank BNL2 are arranged on the first planarizing layer 19. A plurality of insulating layers PAS1 to PAS3 may be disposed on the first planarizing layer 19.

The first bank BNL1 may be arranged directly on the first planarization layer 19. The first bank BNL1 may extend in the second direction DR2 in each subpixel PXn, but may be disposed within the emission area EMA without extending to other subpixels PXn adjacent in the second direction DR 2. The first banks BNL1 may be spaced apart from each other in the first direction DR1, and the light emitting element ED may be disposed between the first banks BNL 1. The first bank BNL1 may be arranged in each subpixel PXn in the display area DPA of the display device 10 to form a line pattern. More first banks BNL1 may be arranged according to the number of regions in each subpixel PXn where the light emitting element ED is arranged.

At least a portion of each of the first banks BNL1 may protrude from the upper surface of the first planarization layer 19. The protruding portion of each of the first banks BNL1 may have an inclined side surface, and light emitted from the light emitting element ED may be reflected by the electrode RME disposed on the first bank BNL1 to propagate toward above the first planarization layer 19. The first bank BNL1 may provide a region in which the light emitting element ED is arranged while serving as a reflective barrier that reflects light emitted from the light emitting element ED in an upward direction. The outer surface of the first dike BNL1 may also have a curved semi-circular or semi-elliptical shape. The first bank BNL1 may include an organic insulating material such as Polyimide (PI).

Each of the electrodes RME (RME1, RME2) includes a portion extending in one direction, and the extending portion is arranged in each sub-pixel PXn. According to an embodiment, each of the electrodes RME includes an electrode stem portion RM _ S extending in the second direction DR2 and an electrode extension portion (or electrode protrusion portion) RM _ E connected to the electrode stem portion RM _ S and having a larger width. The electrode extension portion RM _ E protrudes from one side of the electrode stem portion RM _ S in the first direction DR1 in the first direction DR1, and extends to another adjacent subpixel PXn. Each electrode RME may be disposed across the boundary between the sub-pixels PXn adjacent to each other. For example, the electrode stem portion RM _ S of the electrode RME extends in the second direction DR2 in the middle of each subpixel PXn to be located above the emission area EMA and the cutting area CBA. The electrode extension portion RM _ E is connected to a portion of the electrode stem portion RM _ S that is arranged in the emission region EMA, and has a larger width in the first direction DR 1. The electrode extension portion RM _ E may be connected to the electrode trunk portion RM _ S of the electrode RME disposed in one sub-pixel PXn, and may be spaced apart from the electrode trunk portion RM _ S of another sub-pixel PXn adjacent to the sub-pixel PXn in the first direction DR 1. That is, the electrode extension portion RM _ E may be disposed over the sub-pixel PXn adjacent in the first direction DR 1.

The electrode RME of the display device 10 may include a first electrode RME1 and a second electrode RME2, an electrode trunk portion RM _ S of the first electrode RME1 being disposed in each odd-column sub-pixel PXn, and an electrode trunk portion RM _ S of the second electrode RME2 being disposed in each even-column sub-pixel PXn. The electrode trunk portion RM _ S disposed in each of the first sub-pixel PX1 and the third sub-pixel PX3 may be the electrode trunk portion RM _ S of the first electrode RME1, and the electrode trunk portion RM _ S disposed in the second sub-pixel PX2 may be the electrode trunk portion RM _ S of the second electrode RME 2. The first and second electrodes RME1 and RME2 may be alternately and repeatedly disposed along the first direction DR1, and their electrode trunk portions RM _ S and electrode extension portions RM _ E may be spaced apart from each other in the emission area EMA of each sub-pixel PXn.

The second electrode RME2 may extend in the second direction DR2 in the subpixel PXn, but may be spaced apart from another second electrode RME2 in the cutting area CBA. For example, the cut region CBA may be disposed between the emission regions EMA of the subpixels PXn adjacent in the second direction DR2, and the electrode trunk portion RM _ S of the second electrode RME2 may be separated in the cut region CBA from the electrode trunk portion RM _ S of another second electrode RME2 disposed in the subpixels PXn adjacent in the second direction DR 2. The electrode trunk portion RM _ S of the electrode RME disposed in each subpixel PXn may not be separated, but may extend to the subpixel PXn adjacent in the second direction DR 2.

Each of the first electrode RME1 and the second electrode RME2 covers the first bank BNL 1. Each electrode RME may be wider than the first bank BNL1 and may cover the first bank BNL1 arranged in the different subpixels PXn. For example, the electrode trunk portion RM _ S of the first electrode RME1 may cover one first bank BNL1 disposed in the first sub-pixel PX1, and the electrode extension portion RM _ E of the first electrode RME1 may cover one first bank BNL1 disposed in the second sub-pixel PX 2. The first electrode RME1 and the second electrode RME2 may cover the first banks BNL1 spaced apart from each other within one subpixel PXn, respectively. That is, the first electrode RME1 and the second electrode RME2 may cover different first banks BNL1 arranged in one subpixel PXn, and thus may be spaced apart from each other. The first and second electrodes RME1 and RME2 may be disposed on side surfaces of the first bank BNL1, respectively, and a gap between the first and second electrodes RME1 and RME2 may be smaller than a gap between the first banks BNL 1. At least a portion of each of the first and second electrodes RME1 and RME2 may be directly disposed on the first planarizing layer 19 such that they are located on the same plane. In some cases, each electrode RME may be narrower than the first bank BNL 1. Each electrode RME may cover at least one side surface of the first bank BNL1 to reflect light emitted from the light emitting element ED.

According to an embodiment, the electrode contact portion EP disposed on the same layer as the electrode RME may be disposed in the emission area EMA of each subpixel PXn. The electrode contact portion EP may be spaced apart from the electrode trunk portion RM _ S of the electrode RME in the first direction DR1 and spaced apart from the electrode extension portion RM _ E in the second direction DR 2.

A portion of the electrode RME and the electrode contact portion EP may be electrically connected to the light emitting element ED, and a predetermined voltage may be applied so that the light emitting element ED may emit light. The electrode RME and the electrode contact portion EP may be electrically connected to the light emitting element ED through the contact electrodes CNE1 and CNE2, and an electrical signal transmitted to the electrode RME and the electrode contact portion EP may be transmitted to the light emitting element ED through the contact electrodes CNE1 and CNE 2.

The electrode contact portion EP may contact the first conductive pattern CDP by penetrating the first contact hole CT1 of the first planarization layer 19 disposed below the electrode contact portion EP. The electrode contact portion EP may be electrically connected to the first transistor T1 through the first conductive pattern CDP, and may also be electrically connected to a second contact electrode CNE2, which will be described later. The electrode contact portion EP may serve as a connection electrode through which the second contact electrode CNE2 is electrically connected to the first transistor T1 under the second contact electrode CNE 2. Since the electrode contact portion EP is spaced apart from each of the electrodes RME, the electrode contact portion EP may transmit the electrical signal transmitted to the first transistor T1 to the second contact electrode CNE2 regardless of the signal transmitted to the electrodes RME. The electrode contact portion EP may be integral with one of the electrodes RME.

The first electrode RME1 of the electrodes RME may contact the second voltage wiring VL2 by penetrating the second contact hole CT2 of the first planarization layer 19 disposed under the first electrode RME 1. The first electrode RME1 may be electrically connected to the second voltage wiring VL2 through an electrode trunk portion RM _ S formed in the second contact hole CT2, and may also be electrically connected to a first contact electrode CNE1, which will be described later. The positions of the first contact hole CT1 and the second contact hole CT2 may be configured according to embodiments.

Each of the electrodes RME may include a conductive material having a high reflectivity. For example, each electrode RME may include a metal as a material having high reflectivity, such as silver (Ag), copper (Cu), or aluminum (Al), or may be an alloy including aluminum (Al), nickel (Ni), or lanthanum (La). Each electrode RME may reflect light traveling toward the side surface of the first bank BNL1 after being emitted from the light emitting element ED toward above each sub-pixel PXn.

Each electrode RME may further comprise a transparent conductive material. For example, each electrode RME may include ITO, IZO, or ITZO. In some embodiments, each electrode RME may have a structure in which a transparent conductive material and a metal layer having a high reflectivity are stacked, or may be formed as a single layer including the transparent conductive material and/or the metal layer. For example, each electrode RME may have a stacked structure of ITO-Ag-ITO, ITO-Ag-IZO, or ITO-Ag-ITZO-IZO.

Each of the first and second electrodes RME1 and RME2 may include more electrode extension portions RM _ E, or may further include a connection portion or a sub-extension portion connected to the electrode trunk portion RM _ S. The electrode RME may further include an electrode having a different shape from the first and second electrodes RME1 and RME 2.

The electrode RME may be used to form an electric field in each sub-pixel PXn so as to align the light emitting element ED. The light emitting element ED may be placed on the first and second electrodes RME1 and RME2 by an electric field formed between the first and second electrodes RME1 and RME 2. The light emitting elements ED may be jetted onto the electrodes RME by an ink jet printing process. When the ink including the light emitting elements ED is ejected onto the electrodes RME, an electric field is generated by transmitting an alignment signal to the electrodes RME. The light emitting elements ED dispersed in the ink may be aligned on the electrodes RME by a dielectrophoretic force due to an electric field generated on the electrodes RME.

Each of the light emitting elements ED may include a semiconductor layer doped to have a different conductive type, and one end of each of the light emitting elements ED may be oriented to face a specific direction according to a direction of an electric field generated on the electrode RME. The light emitting element ED arranged in each subpixel PXn may be oriented by an electric field generated by an alignment signal of a different symbol. Since the electrodes RME to which alignment signals of different signs are transmitted are disposed in each subpixel PXn, the light emitting element ED may be disposed between the electrodes RME.

When the electrodes RME to which the alignment signals of different symbols are transmitted are arranged in each sub-pixel PXn, the number of the electrodes RME arranged per unit area of each sub-pixel PXn may increase. The electrode stem portion RM _ S of the electrode RME may extend in one direction, and may be disposed in a wiring region located in a non-display region NDA located outside the display region DPA. When a plurality of electrodes RME are arranged in each sub-pixel PXn of the display area DPA, a large number of electrode stem portions RM _ S may be arranged in the wiring area, and gaps between the electrode stem portions RM _ S may be reduced, thereby causing some of the electrodes RME to be short-circuited with each other. In particular, the ultra-high resolution display apparatus 10 may have a large number of sub-pixels PXn per unit area, and a minimum gap required between the electrodes RME to which different alignment signals are transmitted may be more insufficient.

In the display apparatus 10 according to this embodiment, the shape of each electrode RME is designed such that a part of one electrode RME is arranged over two adjacent sub-pixels PXn, thereby reducing the number of electrodes RME arranged in the display area DPA. In one subpixel PXn, electrodes RME (for example, a first electrode RME1 and a second electrode RME2) that are transmitted different alignment signals are arranged. However, since the electrode extension portion RM _ E of each electrode RME is disposed in one or more sub-pixels PXn, it is possible to have different electrodes RME1 and RME2 disposed in each sub-pixel PXn with only a small number of electrodes RME. Accordingly, the number of electrode trunk portions RM _ S arranged outside the display area DPA may be reduced, and a short circuit between the electrodes RME may be prevented, which may be advantageous for implementing the ultra-high resolution display device 10.

Since the electrodes RME1 and RME2, which transmit different alignment signals, are arranged across the boundary of each sub-pixel PXn, the directions of electric fields generated by the alignment signals transmitted to the electrodes RME1 and RME2 may be different during the manufacturing process of the display device 10. For example, in the first sub-pixel PX1, the second electrode RME2 is disposed on the left side of the center of the emission area EMA, and the first electrode RME1 is disposed on the right side of the center of the emission area EMA. On the other hand, in the second sub-pixel PX2, the first electrode RME1 is disposed on the left side of the center of the emission area EMA, and the second electrode RME2 is disposed on the right side of the center of the emission area EMA. Therefore, in the first sub-pixel PX1 and the second sub-pixel PX2, the directions of the electric fields generated by the electrodes RME1 and RME2 may be different, and the direction of the first end of each light emitting element ED oriented according to the direction of the electric field may also be different. In the display apparatus 10 according to this embodiment, one electrode RME may be disposed over adjacent sub-pixels PXn, and the direction of the first end of each light emitting element ED may be different in different sub-pixels PXn. This will be described in more detail later.

The first insulation layer PAS1 is disposed on the first planarization layer 19. The first insulating layer PAS1 may cover the first bank BNL1, the electrode RME, and the electrode contact portion EP. The first insulating layer PAS1 may protect the electrodes RME while insulating the electrodes RME from each other. In addition, the first insulating layer PAS1 may prevent the light emitting element ED disposed on the first insulating layer PAS1 from directly contacting other members and thus being damaged.

In an embodiment, the first insulating layer PAS1 may include openings OP1 and OP2 partially exposing the first electrode RME1 and the electrode contact portion EP, respectively. For example, the first opening OP1 may partially expose a portion of the electrode trunk portion RM _ S of the first electrode RME1 disposed on the upper surface of the first bank BNL 1. The second opening OP2 may expose a portion of the upper surface of the electrode contact portion EP. A portion of each of the contact electrodes CNE1 and CNE2, which will be described later, may contact the electrode RME or the electrode contact portion EP exposed through the opening OP1 or OP 2. In addition, the openings OP1 and OP2 may simultaneously penetrate the first insulating layer PAS1 and a second insulating layer PAS2, which will be described later.

The first insulating layer PAS1 may be stepped such that a portion of the upper surface of the first insulating layer PAS1 is recessed between the first electrode RME1 and the second electrode RME 2. For example, since the first insulating layer PAS1 covers the first and second electrodes RME1 and RME2, the upper surface of the first insulating layer PAS1 may be stepped according to the shape of the electrode RME disposed under the first insulating layer PAS 1.

The second bank BNL2 may be disposed on the first insulating layer PAS 1. In a plan view of the display device 10, the second bank BNL2 may include portions extending in the first direction DR1 and the second direction DR2 to form a lattice pattern over the entire display area DPA. The second bank BNL2 may be disposed between the boundaries of the subpixels PXn to separate adjacent subpixels PXn.

The second bank BNL2 may surround the emission area EMA and the cut area CBA arranged in each subpixel PXn to separate the emission area EMA and the cut area CBA from each other. The first and second electrodes RME1 and RME2 may extend in the second direction DR2 to cross a portion of the second bank BNL2 extending in the first direction DR 1.

The second bank BNL2 may be formed to have a height higher than that of the first bank BNL 1. The second bank BNL2 may prevent the ink from overflowing to the adjacent sub-pixels PXn in the inkjet printing process of the manufacturing process of the display device 10. Therefore, the second bank BNL2 can separate the inks in which the different light emitting elements ED are dispersed for the different sub-pixels PXn so as to prevent the inks from being mixed with each other. Like the first bank BNL1, the second bank BNL2 may include Polyimide (PI).

The light emitting element ED may be disposed on the first insulating layer PAS 1. The light emitting elements ED may be spaced apart from each other along the second direction DR2 in which each electrode RME extends, and may be aligned substantially parallel to each other. The light emitting elements ED may extend in one direction, and a direction in which each of the electrodes RME extends and a direction in which the light emitting elements ED extend may be substantially perpendicular to each other. The light emitting elements ED may extend in a direction not perpendicular but inclined to the direction in which each electrode RME extends.

The light emitting element ED disposed in each of the subpixels PXn may include a light emitting layer 36 (see fig. 5), and the light emitting layer 36 includes different materials to emit light of different wavelength bands. Accordingly, light of the first color, light of the second color, and light of the third color may be output from the first subpixel PX1, the second subpixel PX2, and the third subpixel PX3, respectively. The subpixels PXn may include the same type of light emitting elements ED to emit substantially the same color of light.

Both ends of each light emitting element ED may be respectively disposed on the electrodes RME between the first banks BNL 1. Each light emitting element ED may extend a length greater than a gap between the first and second electrodes RME1 and RME 2. One end of each light emitting element ED may be disposed on the electrode trunk portion RM _ S of one electrode RME, and the other end may be disposed on the electrode extension portion RM _ E of the other electrode RME. In addition, both ends of each light emitting element ED may be disposed on the first and second electrodes RME1 and RME2, respectively. For example, one end of each light emitting element ED arranged in the second sub-pixel PX2 is arranged on the electrode extension portion RM _ E of the first electrode RME1, and the other end is arranged on the electrode stem portion RM _ S of the second electrode RME 2.

Each light emitting element ED may include a plurality of layers arranged in a direction parallel to the upper surface of the first substrate 11 or the first planarizing layer 19. A direction in which each light emitting element ED extends may be parallel to the upper surface of the first planarization layer 19, and the plurality of semiconductor layers included in each light emitting element ED may be sequentially arranged in a direction parallel to the upper surface of the first planarization layer 19. When each of the light emitting elements ED has a different structure, the semiconductor layers may be arranged in a direction perpendicular to the upper surface of the first planarizing layer 19.

Both ends of each light emitting element ED may contact the contact electrodes CNE1 and CNE2, respectively. For example, the insulating film 38 (see fig. 5) may not be formed on the end surface of each light emitting element ED in the direction in which each light emitting element ED extends, thereby partially exposing the semiconductor layer. The exposed semiconductor layer may contact the contact electrodes CNE1 and CNE 2. At least a portion of the insulating film 38 of each light emitting element ED may be removed to partially expose side surfaces of both ends of the semiconductor layer. The exposed side surfaces of the semiconductor layer may directly contact the contact electrodes CNE1 and CNE 2.

As will be described later, each light emitting element ED includes a first semiconductor layer 31 (see fig. 5), a second semiconductor layer 32 (see fig. 5), and a light emitting layer 36 (see fig. 5) arranged between the first semiconductor layer 31 and the second semiconductor layer 32. The first semiconductor layer 31 may be longer than the second semiconductor layer 32, and a first end of each light emitting element ED where the first semiconductor layer 31 is disposed and a second end where the second semiconductor layer 32 is disposed may be defined. The light emitting layer 36 may be arranged closer to the second end based on the longitudinal center of each light emitting element ED, and may be arranged farther from the first end.

In the display device 10, one electrode RME may be disposed over the adjacent sub-pixels PXn, and different electrodes RME1 and RME2 may be partially disposed in one sub-pixel PXn. In some sub-pixels PXn of the display apparatus 10, the first electrode RME1 may be disposed at the left side of the center of the emission area EMA. In the other subpixels PXn, the second electrode RME2 may be disposed on the left side of the center of the emission area EMA. According to the embodiment, the display apparatus 10 may be divided into the first and second type subpixels PXA and PXB according to the positions of the first and second electrodes RME1 and RME2, and the light emitting element ED may include a first type light emitting element ED1 disposed in the first type subpixel PXA and a second type light emitting element ED2 disposed in the second type subpixel PXB.

During the manufacturing process of the display device 10, each light emitting element ED may be oriented such that the first end faces the direction of the electric field generated on the electrodes RME1 and RME2 to which different alignment signals are transmitted. A first end of each light emitting element ED may be disposed on the first electrode RME1, and a second end may be disposed on the second electrode RME 2. The first end of the first type light emitting element ED1 and the first end of the second type light emitting element ED2 arranged in the different types of subpixels PXn may face opposite directions.

For example, a first sub-pixel PX1 as a first type sub-pixel PXA and a second sub-pixel PX2 as a second type sub-pixel PXB are illustrated in fig. 3. Like the first subpixel PX1, the third subpixel PX3 of fig. 2 is the first type subpixel PXA. In the first-type subpixel PXA, since the first electrode RME1 is disposed at the right side of the center of the emission area EMA, each first-type light emitting element ED1 of the first-type subpixel PXA may be disposed such that the first end faces the first side of the first direction DR1 or the right side in the drawing. In the second-type sub-pixel PXB, since the first electrode RME1 is disposed at the left side of the center of the emission area EMA, each of the second-type light emitting elements ED2 of the second-type sub-pixel PXB may be disposed such that the first end faces the second side of the first direction DR1 or the left side in the drawing. The display apparatus 10 may include electrodes RME1 and RME2 partially disposed over adjacent subpixels PXn, and may include different types of subpixels PXA and PXB according to the types of electrodes RME1 and RME2 disposed in each emission area EMA. The different types of sub-pixels PXA and PXB may include light emitting elements ED1 and ED2 whose respective first ends are oriented in different directions.

Although not illustrated in the drawings, the sub-pixel arranged at one side or the right side of the third sub-pixel PX3 in the first direction DR1 may be a second-type sub-pixel PXB, which is the same as the second sub-pixel PX2 in the direction of the first ends of the electrodes RME1 and RME 2. However, since the first to third sub-pixels PX1 to PX3 emitting light of different colors may be repeatedly disposed in the display device 10, the sub-pixel disposed at the right side of the third sub-pixel PX3 may emit light of the same color as the color of the light emitted from the first sub-pixel PX 1. In other words, although the sub-pixel arranged at the right side of the third sub-pixel PX3 is classified as the second-type sub-pixel PXB based on the structures of the electrodes RME1 and RME2 and the direction of the first end of the light emitting element ED, the color of light emitted from the light emitting element ED of the sub-pixel may be the same as the color of light emitted from the first sub-pixel PX 1. In the display device 10, the first-type subpixel PXA and the second-type subpixel PXB, which are distinguished from each other by the structure of the electrodes RME1 and RME2 and the direction of the first end of the light emitting element ED, may be alternately and repeatedly disposed, and at the same time, may be repeatedly disposed as the first subpixel PX1 to the third subpixel PX3 which emit light of different colors. That is, the first-type sub-pixel PXA does not necessarily correspond to the first sub-pixel PX1 or the third sub-pixel PX3, and the second-type sub-pixel PXB does not necessarily correspond to the second sub-pixel PX 2.

The second insulating layer PAS2 may be disposed on the first insulating layer PAS1 and the light emitting elements ED to expose both ends of each light emitting element ED. For example, the second insulating layer PAS2 may be entirely disposed on the first insulating layer PAS1 and the light emitting elements ED, but a portion of the second insulating layer PAS2 may be disposed on the light emitting elements ED to expose both ends of each light emitting element ED. During the manufacturing process of the display device 10, the second insulating layer PAS2 may be disposed to cover the light emitting elements ED, the electrodes RME, and the first insulating layer PAS1, and then removed to expose both ends of each light emitting element ED. In a plan view, the second insulating layer PAS2 may extend in the second direction DR2 on the first insulating layer PAS1, and a line-shaped or island-shaped pattern may be formed in each sub-pixel PXn. The second insulating layer PAS2 may protect the light emitting elements ED while fixing the light emitting elements ED in the manufacturing process of the display device 10.

A plurality of contact electrodes CNE1 and CNE2 may be disposed on the second insulating layer PAS 2. Each of the contact electrodes CNE1 and CNE2 may include a portion extending in one direction, and may be disposed on the electrode RME, respectively. The contact electrodes CNE1 and CNE2 may include a first contact electrode CNE1 disposed on the first electrode RME1 and a second contact electrode CNE2 disposed on the second electrode RME 2. Each of the first and second contact electrodes CNE1 and CNE2 may be disposed on the electrode trunk portion RM _ S or the electrode extension portion RM _ E of the first or second electrode RME1 or RME 2. For example, the first contact electrode CNE1 disposed in the first sub-pixel PX1 may be disposed on the electrode trunk portion RM _ S of the first electrode RME1, and the first contact electrode CNE1 disposed in the second sub-pixel PX2 may be disposed on the electrode extension portion RM _ E of the first electrode RME 1.

In an embodiment, the first contact electrode CNE1 may extend in one direction. Unlike the first contact electrode CNE1, the second contact electrode CNE2 may include: a contact electrode trunk portion CN _ S arranged on each electrode RME and extending in one direction; a contact electrode extension portion CN _ E disposed on the electrode contact portion EP disposed in the emission area EMA of each subpixel PXn; and a contact electrode connecting portion CN _ B connecting the contact electrode extension portion CN _ E and the contact electrode trunk portion CN _ S. In the second contact electrode CNE2 arranged in the first-type subpixel PXA, since the contact electrode trunk portion CN _ S and the contact electrode extension portion CN _ E are arranged side by side, the contact electrode connection portion CN _ B may be short. On the other hand, in the second contact electrode CNE2 disposed in the second-type subpixel PXB, the contact electrode connecting portion CN _ B may extend in the first direction DR1 and the second direction DR2 and may be bent. The second contact electrode CNE2 may have substantially the same shape as the first contact electrode CNE 1.

The contact electrodes CNE1 and CNE2 may be spaced apart from each other or may face each other. For example, the contact electrode stem portions CN _ S of the first and second contact electrodes CNE1 and CNE2 may be disposed on the first and second electrodes RME1 and RME2, respectively, and may be spaced apart from each other in the first direction DR 1.

Each of the contact electrodes CNE1 and CNE2 may contact the light emitting element ED. The first contact electrode CNE1 may contact a first end of the light emitting element ED, and the second contact electrode CNE2 may contact a second end of the light emitting element ED. The semiconductor layer may be exposed on both end surfaces of each light emitting element ED in a direction in which each light emitting element ED extends, and the contact electrodes CNE1 and CNE2 may directly contact the exposed semiconductor layer of each light emitting element ED, respectively, and thus be electrically connected to the exposed semiconductor layer of each light emitting element ED. Respective sides of the contact electrodes CNE1 and CNE2, which are in contact with both ends of each light emitting element ED, may be disposed on the second insulating layer PAS 2.

The width of each contact electrode CNE1 or CNE2 measured in one direction may be smaller than the width of each electrode RME measured in that direction. The contact electrodes CNE1 and CNE2 may be disposed to contact one end and the other end of each light emitting element ED, respectively, while partially covering the upper surfaces of the first electrode RME1 and the second electrode RME2, respectively. The contact electrodes CNE1 and CNE2 may be wider than the electrodes RME to cover both sides of each electrode RME.

The contact electrodes CNE1 and CNE2 may transmit an electrical signal received from a circuit layer disposed below the first planarization layer 19 to the light emitting element ED. Each of the contact electrodes CNE1 and CNE2 may be electrically connected to the first transistor T1 or the second voltage wiring VL2 through the electrode RME or the electrode contact portion EP. For example, the first contact electrode CNE1 may contact the first electrode RME1 through the first opening OP1 penetrating the first insulating layer PAS1 and the second insulating layer PAS 2. The second power voltage may be transmitted to the first electrode RME1 through the second voltage wiring VL2, and the first contact electrode CNE1 may transmit the second power voltage to the first terminal of each light emitting element ED. The contact electrode extension portion CN _ E of the second contact electrode CNE2 may contact the electrode contact portion EP through the second opening OP2 penetrating the first insulating layer PAS1 and the second insulating layer PAS 2. The first power voltage may be transmitted to the electrode contact portion EP through the first transistor T1, and the second contact electrode CNE2 may transmit the first power voltage to the second terminal of each light emitting element ED. The electrode trunk portion RM _ S of the second electrode RME2 of the second-type subpixel PXB may be separated from the electrode trunk portion RM _ S of another second electrode RME2 in the cut part CB of the cut region CBA, may not be electrically connected to a circuit layer therebelow through the first contact hole CT1 or the second contact hole CT2, and may not contact the second contact electrode CNE 2. That is, the second electrode RME2 disposed in each of the second-type subpixels PXB may be a floating electrode to which no electrical signal is transmitted when the display device 10 is driven. The second electrode RME2 may receive an alignment signal during a manufacturing process of the display device 10 and may be in a floating state in each subpixel PXn during driving of the display device 10. The second contact electrode CNE2 disposed on the second electrode RME2 may receive the first power voltage through the electrode contact portion EP and transmit the first power voltage to the second terminal of each light emitting element ED without passing through the second electrode RME 2.

Since the display device 10 includes the first and second type subpixels PXA and PXB, the positions of the first and second electrodes RME1 and RME2 and the directions of the first ends of the light emitting elements ED1 and ED2 may be different in the first and second type subpixels PXA and PXB. Similarly, according to the embodiment, the contact electrodes CNE1 and CNE2 arranged in the first type subpixel PXA and the second type subpixel PXB may be arranged at different positions based on the center of the emission area EMA. For example, in the first type subpixel PXA, the first contact electrode CNE1 may be disposed at the right side of the center of the emission area EMA, and the second contact electrode CNE2 may be disposed at the left side of the center of the emission area EMA. The contact electrodes CNE1 and CNE2 of the second type subpixel PXB may be disposed at positions opposite to the positions of the contact electrodes CNE1 and CNE2 of the first type subpixel PXA.

The contact electrodes CNE1 and CNE2 may include a transparent conductive material. For example, the contact electrodes CNE1 and CNE2 may include ITO, IZO, ITZO, or aluminum (Al). Light emitted from the light emitting element ED may pass through the contact electrodes CNE1 and CNE2 and travel toward the electrode RME.

The number of the contact electrodes CNE1 and CNE2 may vary according to the number of the electrodes RME arranged in each subpixel PXn.

The third insulating layer PAS3 may be entirely disposed on the entire display area DPA of the first substrate 11. The third insulating layer PAS3 may protect the members disposed on the first substrate 11 from the external environment. However, the third insulating layer PAS3 may be omitted.

Each of the first, second, and third insulating layers PAS1, PAS2, and PAS3 described above may include an inorganic insulating material or an organic insulating material. For example, each of the first, second, and third insulating layers PAS1, PAS2, and PAS3 may include an inorganic insulating material, such as silicon oxide (SiO)_x) Silicon nitride (SiN)_x) Silicon oxynitride (SiO)_xN_y) Alumina (Al)₂O₃) Or aluminum nitride (AlN). Each of the first, second, and third insulating layers PAS1, PAS2, and PAS3 may include an organic insulating material such as acrylic resin, epoxy resin, phenol resin, polyamide resin, or the like,Polyimide resin, unsaturated polyester resin, polyphenyl resin, polyphenylene sulfide resin, benzocyclobutene, cardo resin, siloxane resin, silsesquioxane resin, polymethyl methacrylate, polycarbonate, or polymethyl methacrylate-polycarbonate synthetic resin.

In the display apparatus 10, since different electrodes RME1 and RME2 are arranged in each sub-pixel PXn, the light emitting element ED and the contact electrodes CNE1 and CNE2 may have different arrangement structures in the first-type sub-pixel PXA and the second-type sub-pixel PXB described above. During the manufacturing process of the display apparatus 10, different alignment signals may be transmitted to the electrode RME disposed in each sub-pixel PXn, and even if the same-shaped electrode RME is disposed over the adjacent sub-pixels PXn, the arrangement of the light emitting element ED and the contact electrodes CNE1 and CNE2 may be different in the first-type and second-type sub-pixels PXA and PXB. Since the display device 10 includes the electrodes RME configured to reduce the number of the electrodes RME arranged per unit area of the display device 10, short circuits between the adjacent electrodes RME may be prevented. In addition, the display apparatus 10 may include the first-type and second-type sub-pixels PXA and PXB, and the arrangement of the light emitting element ED and the contact electrodes CNE1 and CNE2 is different in each of the first-type and second-type sub-pixels PXA and PXB.

Fig. 5 is a schematic diagram of a light emitting element ED according to an embodiment.

The light emitting elements ED may be LEDs. Specifically, the light emitting element ED may be an inorganic LED having a micro or nano size and made of an inorganic material. When an electric field is formed in a specific direction between two electrodes facing each other, the inorganic LED may be aligned between the two electrodes in which polarities are formed. The LED may be aligned between the electrodes by an electric field formed on both electrodes.

The light emitting element ED according to the embodiment may extend in one direction. The light emitting element ED may be shaped as a cylinder, a rod, a wire or a tube, etc. The light emitting element ED may have various shapes including a polygonal prism such as a cube, a rectangular parallelepiped, and a hexagonal prism and a shape extending in one direction and having a partially inclined outer surface. The plurality of semiconductors included in the light emitting element ED may be sequentially arranged or stacked along the one direction.

The light emitting element ED may include a semiconductor layer doped with impurities of any conductivity type (e.g., p-type or n-type). The semiconductor layer may receive an electrical signal from an external power source and emit light of a specific wavelength band.

Referring to fig. 5, the light emitting element ED may include a first semiconductor layer 31, a second semiconductor layer 32, a light emitting layer 36, an electrode layer 37, and an insulating film 38.

The first semiconductor layer 31 may be an n-type semiconductor. When the light emitting element ED emits light in the blue wavelength band, the first semiconductor layer 31 may include Al having a chemical formula_xGa_yIn_1-x-yN (x is more than or equal to 0 and less than or equal to 1, y is more than or equal to 0 and less than or equal to 1, and x + y is more than or equal to 0 and less than or equal to 1). For example, the semiconductor material included in the first semiconductor layer 31 may be one or more of n-type doped AlGaInN, GaN, AlGaN, InGaN, AlN, and InN. The first semiconductor layer 31 may be doped with an n-type dopant, and the n-type dopant may be Si, Ge, Sn, or the like. For example, the first semiconductor layer 31 may be n-GaN doped with n-type Si. The length of the first semiconductor layer 31 may be in the range of 1.5 μm to 5 μm. The first end of the light emitting element ED may be a portion where the first semiconductor layer 31 is arranged based on the light emitting layer 36.

The second semiconductor layer 32 is disposed on a light emitting layer 36 which will be described later. The second semiconductor layer 32 may be a p-type semiconductor. When the light emitting element ED emits light in a blue wavelength band or a green wavelength band, the second semiconductor layer 32 may include Al having a chemical formula_xGa_yIn_1-x-yN (x is more than or equal to 0 and less than or equal to 1, y is more than or equal to 0 and less than or equal to 1, and x + y is more than or equal to 0 and less than or equal to 1). For example, the semiconductor material included in the second semiconductor layer 32 may be one or more of p-type doped AlGaInN, GaN, AlGaN, InGaN, AlN, and InN. The second semiconductor layer 32 may be doped with a p-type dopant, and the p-type dopant may be Mg, Zn, Ca, Se, Ba, or the like. For example, the second semiconductor layer 32 may be p-GaN doped with p-type Mg. The length of the second semiconductor layer 32 may be in the range of 0.05 μm to 0.10 μm. Light-emitting element E The second end of D may be a portion where the second semiconductor layer 32 is disposed based on the light emitting layer 36.

Each of the first semiconductor layer 31 and the second semiconductor layer 32 may include more layers depending on the material of the light emitting layer 36, and for example, may further include a clad layer or a Tensile Strain Barrier Reduction (TSBR) layer.

The light emitting layer 36 is disposed between the first semiconductor layer 31 and the second semiconductor layer 32. The light emitting layer 36 may include a material having a single or multiple quantum well structure. When the light emitting layer 36 includes a material having a multiple quantum well structure, the light emitting layer 36 may have a structure in which multiple quantum layers and multiple well layers are alternately stacked. The light emitting layer 36 may emit light by combination of electron-hole pairs according to an electrical signal received through the first and second semiconductor layers 31 and 32. When the light emitting layer 36 emits light in the blue wavelength band, the light emitting layer 36 may include a material such as AlGaN or AlGaInN. Specifically, when the light emitting layer 36 has a multiple quantum well structure in which quantum layers and well layers are alternately stacked, the quantum layers may include a material such as AlGaN or AlGaInN, and the well layers may include a material such as GaN or AlInN. For example, the light emitting layer 36 may include AlGaInN as a quantum layer and AlInN as a well layer to emit blue light having a central band in the range of 450nm to 495 nm.

The light emitting layer 36 may have a structure in which a semiconductor material having a large band gap energy and a semiconductor material having a small band gap energy are alternately stacked, or may include different group 3 to 5 semiconductor materials depending on a wavelength band of emitted light. The light emitted from the light emitting layer 36 is not limited to light in the blue wavelength band. In some cases, the light emitting layer 36 may emit light in the red or green wavelength bands. The length of the light emitting layer 36 may be in the range of 0.05 μm to 0.10 μm.

The light emitted from the light-emitting layer 36 can be radiated not only through the outer surface of the light-emitting element ED in the longitudinal direction but also through both side surfaces. The direction of light emitted from the light-emitting layer 36 is not limited to one direction.

The electrode layer 37 may be an ohmic contact electrode. The electrode layer 37 may be a schottky contact electrode. The light emitting element ED may include at least one electrode layer 37. The light emitting element ED may include more electrode layers 37, or the electrode layers 37 may be optional. The following description of the light emitting element ED may be equally applicable even when the light emitting element ED includes a different number of electrode layers 37 or further includes another structure.

When the light emitting element ED is electrically connected to the electrode RME or the contact electrodes CNE1 and CNE2 in the display device 10 according to this embodiment, the electrode layer 37 can reduce the resistance between the light emitting element ED and the electrode RME or the contact electrodes CNE1 and CNE 2. The electrode layer 37 may include a conductive metal. For example, the electrode layer 37 may include at least one of aluminum (Al), titanium (Ti), indium (In), gold (Au), silver (Ag), Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), and Indium Tin Zinc Oxide (ITZO). In addition, the electrode layer 37 may comprise an n-type or p-type doped semiconductor material.

The insulating film 38 surrounds the outer surfaces of the semiconductor layer and the electrode layer described above. For example, the insulating film 38 may surround at least the outer surface of the light emitting layer 36 and extend in the direction in which the light emitting elements ED extend. The insulating film 38 may protect the above members. The insulating film 38 may surround the side surfaces of the above members, but may expose both ends of the light emitting element ED in the longitudinal direction.

In the drawing, the insulating film 38 extends in the longitudinal direction of the light emitting element ED to cover from the side surface of the first semiconductor layer 31 to the side surface of the electrode layer 37. The insulating film 38 may cover only some of the semiconductor layers and the outer surface of the light emitting layer 36, or may cover only a part of the outer surface of the electrode layer 37 to partially expose the outer surface of each electrode layer 37. In a cross section in a region adjacent to at least one end of the light emitting element ED, the upper surface of the insulating film 38 may be circular.

The thickness of the insulating film 38 may be in the range of 10nm to 1.0 μm. The thickness of the insulating film 38 may preferably be about 40 nm.

The insulating film 38 may include, for example, silicon oxide (SiO)_x) Silicon nitride (SiN)_x) Silicon oxynitride (SiO)_xN_y) Aluminum nitride (AlN) or aluminum oxide (Al)₂O₃) Of (4) an insulating material. Therefore, can prevent An electrical short which may occur when the light emitting layer 36 directly contacts an electrode for transmitting an electrical signal to the light emitting element ED is stopped. In addition, since the insulating film 38 protects the outer surface of the light emitting element ED including the light emitting layer 36, a decrease in light emission efficiency can be prevented.

The outer surface of the insulating film 38 may be processed. The light emitting elements ED dispersed in a predetermined ink may be ejected onto the electrodes and then aligned. Here, the surface of the insulating film 38 may be treated with hydrophobicity or hydrophilicity so that the light emitting elements ED remain separated in the ink without being aggregated with other adjacent light emitting elements ED. For example, the outer surface of the insulating film 38 may be treated with a material such as stearic acid or 2, 3-naphthalenedicarboxylic acid.

The length h of the light emitting element ED may be in the range of 1 μm to 10 μm or in the range of 2 μm to 6 μm, and may preferably be in the range of 3 μm to 5 μm. The diameter of the light emitting element ED may be in a range of 30nm to 700nm, and the aspect ratio of the light emitting element ED may be 1.2 to 100. The light emitting elements ED included in the display device 10 may have different diameters according to the composition of the light emitting layer 36. The diameter of the light emitting element ED may preferably be about 500 nm.

In the light emitting element ED, the first semiconductor layer 31 and the second semiconductor layer 32 may be semiconductor layers doped to have different conductive types, and a dipole moment facing a longitudinal direction of the light emitting element ED may be formed between the first and second ends of the light emitting element ED. When the light emitting elements ED are placed in electric fields generated on the electrodes RME to which different alignment signals are transmitted, the light emitting elements ED having dipole moments may be disposed on the electrodes RME because their positions and orientation directions are changed by dielectrophoretic forces applied to the light emitting elements ED. The direction in which the first end of the light emitting element ED faces may vary depending on the direction of the dipole moment and the direction of the electric field. Since the sub-pixels PXn include different types of sub-pixels PXA and PXB, electric fields generated in the different types of sub-pixels PXA and PXB may face different directions during a manufacturing process of the display apparatus 10, and a direction of the first end of the light emitting element ED may be different in each type of sub-pixel PXA or PXB.

Fig. 6 and 7 are plan views illustrating some operations in a process of manufacturing the display device 10 according to the embodiment.

First, referring to fig. 6, a process of manufacturing the display device 10 may include: forming a first bank BNL1, a plurality of electrodes RME, and an electrode contact portion EP in each subpixel PXn; and forming a second bank BNL2 arranged at the boundary of each subpixel PXn. The shapes of the first bank BNL1 and the second bank BNL2 are the same as those described above.

The electrodes RME may each include an electrode trunk portion RM _ S and an electrode extension portion RM _ E, and thus may have substantially the same shape. The electrode stem portion RM _ S extends beyond the emission area EMA and the cutting area CBA in the second direction DR 2. The electrode trunk portions RM _ S of the electrodes RME arranged in the sub-pixels PXn adjacent in the second direction DR2 may be connected to each other. The electrode extension portion RM _ E may be connected to the electrode trunk portion RM _ S in the emission area EMA, and may be arranged across the boundaries of different subpixels PXn adjacent in the first direction DR 1. The electrode contact portion EP may be spaced apart from each of the electrode trunk portion RM _ S and the electrode extension portion RM _ E arranged in the emission area EMA.

The odd-column sub-pixels PXn such as the first sub-pixel PX1 or the third sub-pixel PX3 may be the first-type sub-pixel PXA in which the electrode trunk portion RM _ S of the first electrode RME1 is arranged. The even column sub-pixel PXn such as the second sub-pixel PX2 may be the second type sub-pixel PXB in which the electrode trunk portion RM _ S of the second electrode RME2 is arranged. However, the same electrode RME may be disposed in each subpixel PXn during the manufacturing process of the display device 10, and the first and second electrodes RME1 and RME2 may be arbitrarily defined regardless of their shapes and positions.

Next, referring to fig. 7, the light emitting element ED is disposed in the emission area EMA of each sub-pixel PXn. In an embodiment, the light emitting elements ED may be dispersed in an ink and then ejected onto the emission areas EMA by an inkjet printing process. The second bank BNL2 may prevent ink from overflowing to the emission area EMA of other adjacent subpixels PXn.

When ink is ejected onto the emission area EMA, an electric field EF1 or EF2 is generated on the electrode RME by transmitting the alignment signals Signal1 and Signal2 to the electrode RME, respectively. The light emitting elements ED dispersed in the ink can receive a dielectrophoretic force due to the electric field EF1 or EF 2. Therefore, both ends of each light emitting element ED may be disposed on different electrodes RME1 and RME 2.

Different alignment signals Signal1 and Signal2 may be transmitted to the electrodes RME1 and RME2 disposed in each sub-pixel PXn, and an electric field EF1 or EF2 may be generated by a voltage difference between the alignment signals Signal1 and Signal 2. To generate the electric field EF1 or EF2 between the first and second electrodes RME1 and RME2 spaced apart from each other, a first alignment Signal1 may be transmitted to the first electrode RME1, and a second alignment Signal2 may be transmitted to the second electrode RME 2.

Each of the alignment signals Signal1 and Signal2 may be transmitted to the electrode extension RM _ E of the electrode RME1 or RME2 through the electrode stem portion RM _ S. The electric field EF1 or EF2 may be generated in each subpixel PXn by an alignment signal transmitted to the electrode trunk portion RM _ S and an alignment signal transmitted to the electrode extension portion RM _ E. Based on the electrode stem portion RM _ S, different alignment signals Signal1 and Signal2 are transmitted to the sub-pixels PXn adjacent in the first direction DR 1. For example, in the odd column subpixels PXn, the first alignment Signal1 is transmitted to the electrode trunk portion RM _ S of the first electrode RME1, and the second alignment Signal2 is transmitted to the electrode extension portion RM _ E of the second electrode RME 2. In the even column subpixel PXn, the second alignment Signal2 is transmitted to the electrode stem portion RM _ S of the second electrode RME2, and the first alignment Signal1 is transmitted to the electrode extension portion RM _ E of the first electrode RME 1. Since the electrode extension portion RM _ E is disposed at the left side of the center of the emission area EMA and the electrode trunk portion RM _ S is disposed at the right side in each sub-pixel PXn, the arrangement of the electrode trunk portion RM _ S and the electrode extension portion RM _ E may be the same in the sub-pixel PXn, but the alignment signals Signal1 and Signal2 transmitted to the sub-pixel PXn may be opposite to each other. When the direction of the electric fields EF1 or EF2 generated by the alignment signals Signal1 and Signal2 is defined as a direction from the electrode to which the first alignment Signal1 is transmitted toward the electrode to which the second alignment Signal2 is transmitted, the directions of the electric fields EF1 and EF2 generated in the subpixel PXn may be opposite to each other.

In the odd-numbered column subpixels PXn, the first electric field EF1 is generated facing the electrode extension RM _ E to which the second alignment Signal2 is transmitted. In the even-numbered column subpixels PXn, the second electric field EF2 is generated facing the electrode trunk portion RM _ S to which the second alignment Signal2 is transmitted. Therefore, electric fields EF1 and EF2 of opposite directions may be generated in the odd column sub-pixels PXn and the even column sub-pixels PXn, and the directions of the first ends of the light emitting elements ED arranged in the odd column sub-pixels PXn and the even column sub-pixels PXn may be opposite to each other.

According to an embodiment, in the display apparatus 10, the first alignment Signal1 may be transmitted to the electrode trunk portion RM _ S of the first-type sub-pixel PXA in which the electrode trunk portion RM _ S of the first electrode RME1 is disposed, and the second alignment Signal2 may be transmitted to the electrode trunk portion RM _ S of the second-type sub-pixel PXB in which the electrode trunk portion RM _ S of the second electrode RME2 is disposed. Since the first electric field EF1 is generated in the first-type subpixel PXA and the second electric field EF2 is generated in the second-type subpixel PXB, the first-type light-emitting element ED1 may be disposed in the first-type subpixel PXA with the first end of the first-type light-emitting element ED1 oriented to face the first side of the first direction DR1, and the second-type light-emitting element ED2 may be disposed in the second-type subpixel PXB with the first end of the second-type light-emitting element ED2 oriented to face the second side of the first direction DR 1. Since the display device 10 includes the electrodes RME1 and RME2 designed to minimize the number of the electrodes RME1 and RME2 arranged per unit area, the display device 10 may include the subpixels PXn in which the first ends of the light emitting elements ED face different directions.

Next, although not illustrated in the drawings, after the light emitting element ED is disposed, the second insulating layer PAS2 is formed, and the electrode stem portion RM _ S of the second electrode RME2 disposed in the second-type sub-pixel PXB is divided in the cut region CBA. Then, the openings OP1 and OP2 and the contact electrodes CNE1 and CNE2 are formed to complete the display device 10. The shapes and the arrangement of the openings OP1 and OP2 and the contact electrodes CNE1 and CNE2 are the same as those described above.

Fig. 8 is a plan view of a pixel of the display device 10 according to the embodiment.

Referring to fig. 8, in the display device 10, the electrode trunk portion RM _ S of the second electrode RME2 disposed in the second-type sub-pixel PXB may also be connected without being divided in the cutting area CBA. During the manufacturing process of the display device 10, the alignment signals Signal1 and Signal2 transmitted to the first and second electrodes RME1 and RME2 may be directly transmitted to the electrodes RME1 and RME2, respectively, through separate alignment means. Therefore, the second electrode RME2 may not be connected to an underlying circuit layer, and the second electrode RME2 disposed in each sub-pixel PXn may be in a floating state even if the electrode trunk portion RM _ S is not separated by the cut portion CB. Since the second contact electrode CNE2 does not directly contact the second electrode RME2, the second electrodes RME2 arranged in the sub-pixels PXn adjacent in the second direction DR2 may be connected to each other. In the display device 10, since a process of separating the second electrode RME2 is omitted, the number of manufacturing processes can be reduced. Other details are the same as those of the embodiment of fig. 2 described above.

Fig. 9 is a partial sectional view of the display device 10 according to the embodiment.

Referring to fig. 9, in the display device 10, the second voltage wiring VL2 may be omitted, and the second contact hole CT2 may not be formed in the first planarization layer 19. The electrode stem portions RM _ S of the first electrodes RME1 may be connected to each other, and thus directly connected to voltage pads (not shown) disposed in the non-display area NDA. The second power supply voltage may be directly applied to the first electrode RME1, and the second voltage wiring VL2 may be omitted. Even when the second power voltage is simultaneously applied to the plurality of subpixels PXn because the second power voltage is applied to the first electrode RME1, the light emitting element ED may emit light in response to the first power voltage received from the first transistor T1 through the second contact electrode CNE 2. Since the second contact electrode CNE2 receives the first power supply voltage through the electrode contact part EP disposed in each subpixel PXn, the subpixels PXn can be driven individually even if the second power supply voltage is simultaneously applied to the first electrodes RME1 of the subpixels PXn. In the display device 10, since the second voltage wiring VL2 is omitted, the number of processes for manufacturing a circuit layer can be reduced, and if the first voltage wiring VL1 is disposed on another layer, the second data conductive layer can be omitted. The present embodiment is different from the embodiment of fig. 4 in that the second voltage wiring VL2 is omitted. Other details are the same as those described above.

If the number of the electrodes RME1 and RME2 to which the alignment signals Signal1 and Signal2 are transmitted can be reduced during the manufacturing process of the display device 10, the structure of each electrode RME1 or RME2 can be variously designed. For example, as long as each of the electrodes RME1 or RME2 includes an electrode trunk portion RM _ S and a portion connected to the electrode trunk portion RM _ S and arranged over the sub-pixels PXn adjacent in the first direction DR1, the portion may have a different shape from the electrode extension portion RM _ E. In addition, if the electrodes RME1 and RME2 are separated such that the first power voltage applied to the light emitting element ED can be individually applied to each subpixel PXn, the first power voltage and the second power voltage may be transmitted through each electrode RME1 or RME2, and the electrode contact portion EP may be optional or may be connected to one of the electrodes RME1 and RME 2.

Fig. 10 is a plan view of a pixel of the display device 10 according to the embodiment. Fig. 11 is a plan view illustrating one operation in a process of manufacturing the display device 10 of fig. 10. Fig. 11 is a plan view illustrating an operation of aligning the light emitting elements ED during a manufacturing process of the display device 10 of fig. 10, and illustrates a state in which each of the electrodes RME1_1 or RME2_1 is not separated in the cut part CB.

Referring to fig. 10 and 11, even though the first and second electrodes RME1_1 and RME2_1 do not necessarily include the electrode extension portion RM _ E having a wide width, the first and second electrodes RME1_1 and RME2_1 may be disposed over the sub-pixels PXn adjacent in the first direction DR 1. For example, the first electrode RME1_1 includes a first electrode trunk portion RM _ S1, a first electrode facing portion RM _ F1, and an electrode connecting portion RM _ B connecting the first electrode trunk portion RM _ S1 and the first electrode facing portion RM _ F1. The second electrode RME2_1 includes a second electrode stem portion RM _ S2, a second electrode facing portion RM _ F2, and an electrode separating portion RM _ D connected to the second electrode facing portion RM _ F2 but separated from the second electrode stem portion RM _ S2. In the display device 10, each electrode RME1_1 or RME2_1 is arranged over the sub-pixels PXn adjacent in the first direction DR1, but some of each electrode RME1_1 or RME2_1 may be separated after alignment of the light emitting elements ED. Therefore, different types of sub-pixels PXA and PXB in which different electrode trunk portions RM _ S1 and RM _ S2 are arranged may be different in the structure of the electrodes RME1_1 and RME2_1 arranged in the emission area EMA. The embodiment of fig. 10 and 11 is different from the embodiment of fig. 2 and 7 in the shapes of the first electrode RME1_1 and the second electrode RME2_ 1. Hereinafter, any redundant description will be omitted, and differences will be mainly described.

The first electrode RME1_1 includes a first electrode trunk portion RM _ S1 extending in the second direction DR2, a first electrode facing portion RM _ F1 disposed in the emission area EMA of the other sub-pixel PXn and spaced apart from the second electrode RME2_1 to face the second electrode RME2_1, and an electrode connecting portion RM _ B connecting the first electrode trunk portion RM _ S1 and the first electrode facing portion RM _ F1. The first electrode trunk portion RM _ S1 is arranged in the first type subpixel PXA and extends in the second direction DR 2. The first electrode trunk portions RM _ S1 extend beyond the boundaries of the sub-pixels PXn adjacent in the second direction DR2, and one first electrode trunk portion RM _ S1 may be arranged in the first type sub-pixels PXA arranged in the same odd column. The first electrode trunk portion RM _ S1 may be electrically connected to the second voltage wiring VL2 therebelow through the second contact hole CT 2. That is, the first electrode stem portion RM _ S1 may have substantially the same shape as the electrode stem portion RM _ S included in the first electrode RME1 of fig. 2.

The first electrode facing portion RM _ F1 may be arranged in the emission area EMA of the second-type sub-pixel PXB adjacent in the first direction DR1, and may extend in the second direction DR 2. The first electrode facing portion RM _ F1 may be spaced apart from the second electrode trunk portion RM _ S2 of the second electrode RME2_1, and the first end of the second-type light emitting element ED2 arranged in the second-type subpixel PXB may be arranged on the first electrode facing portion RM _ F1.

The electrode connection portion RM _ B may extend in the first direction DR1 to connect the first electrode trunk portion RM _ S1 and the first electrode facing portion RM _ F1, and may be arranged across a boundary between the first-type subpixel PXA and the second-type subpixel PXB. Unlike the electrode extension portion RM _ E, the first electrode facing portion RM _ F1 and the electrode connecting portion RM _ B may have the same width as the first electrode stem portion RM _ S1. In the first electrode RME1_1, the first electrode trunk portion RM _ S1, the first electrode facing portion RM _ F1 and the electrode connecting portion RM _ B may become one electrode, and may transmit the second power supply voltage received through the second voltage wiring VL 2. For example, the first electrode RME1_1 may be electrically connected to the second voltage wiring VL2 through the second contact hole CT2 formed to overlap the first electrode trunk portion RM _ S1 of the first-type subpixel PXA. As in the embodiment of fig. 9, the second power voltage may be directly applied to the first electrode RME1_1, in which case the second contact hole CT2 may be optional.

The second electrode RME2_1 includes a second electrode trunk portion RM _ S2 extending in the second direction DR2, a second electrode facing portion RM _ F2 disposed in the emission area EMA of the other sub-pixel PXn and spaced apart from the first electrode RME1_1 to face the first electrode RME1_1, and an electrode separating portion RM _ D connected to the second electrode facing portion RM _ F2 but separated from the second electrode trunk portion RM _ S2. The second electrode trunk portion RM _ S2 may be arranged in the second-type subpixel PXB to extend in the second direction DR2, but may be separated from the second electrode trunk portion RM _ S2 of the subpixel PXn adjacent in the second direction DR2 in the cut portion CB of the cut region CBA. One second electrode trunk portion RM _ S2 may be arranged in the second-type subpixels PXB arranged in the same even column.

The second electrode facing portion RM _ F2 may be arranged in the emission area EMA of the first-type sub-pixel PXA adjacent in the first direction DR1, and may extend in the second direction DR 2. The second electrode facing portion RM _ F2 may be spaced apart from the first electrode trunk portion RM _ S1 of the first electrode RME1_1, and the second end of the first-type light emitting element ED1 disposed in the first-type subpixel PXA may be disposed on the second electrode facing portion RM _ F2.

The electrode separating portion RM _ D may be connected to the second electrode facing portion RM _ F2 to extend in the first direction DR1, and may be arranged across a boundary between the first-type subpixel PXA and the second-type subpixel PXB. The electrode separating portion RM _ D may be connected to the second electrode trunk portion RM _ S2 during the manufacturing process of the display device 10, and then separated in the cutting portion CB after the alignment process of the light emitting element ED. The electrode separating portion RM _ D and the second electrode facing portion RM _ F2 may receive the same alignment signal during the manufacturing process of the display apparatus 10, but may receive different signals when the display apparatus 10 is driven because they are arranged in different types of sub-pixels PXA and PXB. Unlike the electrode extension portion RM _ E, the second electrode facing portion RM _ F2 and the electrode separating portion RM _ D may also have the same width as the second electrode stem portion RM _ S2. The second electrode RME2_1 may include a second electrode trunk portion RM _ S2, a second electrode facing portion RM _ F2, and an electrode separating portion RM _ D separated from the second electrode trunk portion RM _ S2, and may transmit the first power supply voltage received through the first transistor T1.

The second electrode RME2_1 may receive the first power voltage through the first transistor T1. According to an embodiment, each of the second electrode trunk portion RM _ S2 and the electrode separating portion RM _ D of the second electrode RME2_1 may contact the first conductive pattern CDP therebelow through the first contact hole CT 1. The first contact hole CT1 may be formed to overlap the electrode separating portion RM _ D in the first-type subpixel PXA and may be formed to overlap the second electrode trunk portion RM _ S2 in the second-type subpixel PXB. In the different types of sub-pixels PXA and PXB, the positions of the first conductive patterns CDP of the circuit layer disposed under the first and second electrodes RME1_1 and RME2_1 may be designed according to the shapes of the first and second electrodes RME1_1 and RME2_1 to transmit the first power voltage to the second electrode RME2_ 1. The first contact hole CT1 may also be formed at a position different from that of fig. 10. In some embodiments, an electrode contact portion EP may be disposed in each subpixel PXn, and the first power supply voltage may be applied through the electrode contact portion EP.

The first bank BNL1 may be disposed below the electrode trunk portion RM _ S1 or RM _ S2 or the electrode facing portion RM _ F1 or RM _ F2 in the emission area EMA of each sub-pixel PXn. The first banks BNL1 may be spaced apart from each other, and the electrode trunk portion RM _ S1 or RM _ S2 and the electrode facing portion RM _ F1 or RM _ F2, which are disposed on the first bank BNL1, may also be spaced apart from each other. Accordingly, the light emitting element ED may be disposed on the electrode trunk portion RM _ S1 or RM _ S2 and the electrode facing portion RM _ F1 or RM _ F2.

The light emitting element ED includes a first-type light emitting element ED1 arranged in the first-type subpixel PXA and a second-type light emitting element ED2 arranged in the second-type subpixel PXB. The first-type light emitting element ED1 has a first end disposed on the first electrode trunk portion RM _ S1 and a second end disposed on the second electrode facing portion RM _ F2. The second-type light emitting element ED2 has a first end disposed on the first electrode facing portion RM _ F1 and a second end disposed on the second electrode stem portion RM _ S2. The first type light emitting element ED1 and the second type light emitting element ED2 are arranged such that their first ends face opposite directions.

The first contact electrode CNE1 is disposed on the first electrode trunk portion RM _ S1 or the first electrode facing portion RM _ F1 of the first electrode RME1_ 1. The first contact electrode CNE1 arranged in the first-type subpixel PXA is arranged on the first electrode trunk portion RM _ S1 to contact the first end of the first-type light emitting element ED 1. In addition, the first contact electrode CNE1 of the first-type subpixel PXA may contact the first electrode stem portion RM _ S1 through the second opening OP2 and transmit the second power voltage transmitted to the first electrode RME1_1 to the first end of the first-type light emitting element ED 1. The first contact electrode CNE1 disposed in the second-type subpixel PXB is disposed on the first electrode facing portion RM _ F1 to contact the first end of the second-type light emitting element ED 2. The first contact electrode CNE1 of the second-type subpixel PXB may contact the first electrode facing portion RM _ F1 through the first opening OP1 and transmit the second power voltage supplied to the first electrode RME1_1 to the first end of the second-type light emitting element ED 2.

The second contact electrode CNE2 is disposed on the second electrode trunk portion RM _ S2 or the second electrode facing portion RM _ F2 of the second electrode RME2_ 1. The second contact electrode CNE2 disposed in the first-type subpixel PXA is disposed on the second electrode facing portion RM _ F2 to contact the second end of the first-type light emitting element ED 1. In addition, the second contact electrode CNE2 of the first-type subpixel PXA may contact the second electrode facing portion RM _ F2 through the first opening OP1 and transmit the first power voltage transmitted to the second electrode facing portion RM _ F2 to the second end of the first-type light emitting element ED 1. The second contact electrode CNE2 disposed in the second-type subpixel PXB is disposed on the second electrode trunk portion RM _ S2 to contact the second end of the second-type light emitting element ED 2. The second contact electrode CNE2 of the second-type subpixel PXB may contact the second electrode stem portion RM _ S2 through the second opening OP2 and transmit the first power voltage transmitted to the second electrode RME2_1 to the second end of the second-type light emitting element ED 2.

Unlike the embodiment of fig. 2 and 3, the second contact electrode CNE2 according to the current embodiment may extend in one direction and directly contact the second electrode RME2_1, instead of contacting the electrode contact portion EP. The first and second electrodes RME1_1 and RME2_1 designed to be disposed over the adjacent sub-pixels PXn may directly contact the contact electrodes CNE1 and CNE2 to transmit the first and second power supply voltages to the contact electrodes CNE1 and CNE2, respectively. Even if the electrode contact portion EP is omitted, the second contact electrode CNE2 may receive the first power supply voltage through the second electrode trunk portion RM _ S2 or the second electrode facing portion RM _ F2. However, the second electrode RME2_1 may not be in a floating state, but may receive the first power voltage through the first transistor T1 and may individually apply a signal for each subpixel PXn. For this reason, the second electrode facing portion RM _ F2 of the first-type subpixel PXA and the second electrode trunk portion RM _ S2 of the second-type subpixel PXB need to be separated from each other. In the display device 10, the first electrode RME1_1 and the second electrode RME2_1 may be formed in substantially the same structure, and then a process of partially separating the second electrode RME2_1 may be performed after aligning the light emitting elements ED.

Referring to fig. 11, the first and second electrodes RME1_1 and RME2_1 include electrode trunk portions RM _ S1 and RM _ S2 and electrode facing portions RM _ F1 and RM _ F2, respectively. The first electrode RME1_1 includes an electrode connecting portion RM _ B, and the second electrode RME2_1 includes an electrode separating portion RM _ D. In the operation of aligning the light emitting element ED, the electrode separating portion RM _ D is in a state of being connected to the second electrode trunk portion RM _ S2.

The first alignment Signal1 is transmitted to the first electrode RME1_1, the first electrode trunk portion RM _ S1 of the first electrode RME1_1 is disposed in the first-type sub-pixel PXA, and the second alignment Signal2 is transmitted to the second electrode RME2_1, the second electrode trunk portion RM _ S2 of the second electrode RME2_1 is disposed in the second-type sub-pixel PXB. When the direction of the electric field EF1 or EF2 is defined as a direction from the electrode to which the first alignment Signal1 is transmitted toward the electrode to which the second alignment Signal2 is transmitted, the first electric field EF1 is generated in the first-type subpixel PXA, and the second electric field EF2 is generated in the second-type subpixel PXB. Accordingly, the light emitting element ED is aligned such that the first end is disposed on the first electrode RME1_1, and the first end of the first type light emitting element ED1 and the first end of the second type light emitting element ED2 face opposite directions.

The second power voltage applied to the first electrode RME1_1 may be transmitted from the first electrode trunk portion RM _ S1 and the first electrode facing portion RM _ F1 to the first end of each light emitting element ED1 or ED2 through the first contact electrode CNE 1. The second power voltage may be applied to a first terminal of each light emitting element ED1 or ED2 in each subpixel PXn. Since each subpixel PXn may emit light in response to the first power supply voltage applied to the second electrode RME2_1, the second electrode RME2_1 needs to be separated so that adjacent subpixels PXn may individually emit light. According to an embodiment, in the second electrode RME2_1, the second electrode stem portion RM _ S2 and the electrode separating portion RM _ D may be separated from each other in the cutting portion CB, and the second electrode stem portion RM _ S2 may be separated in the cutting portion CB of the cutting region CBA. The second electrode trunk portion RM _ S2 and the electrode separating portion RM _ D of the second electrode RME2_1 may be separated from each other, and the first power voltage may be separately transmitted to each of the second electrode trunk portion RM _ S2 and the second electrode facing portion RM _ F2 arranged in the emission area EMA of the sub-pixel PXn.

Unlike in the embodiments of fig. 2 and 7, in the display device 10, each electrode RME1_1 or RME2_1 may be partially disposed over different types of sub-pixels PXA and PXB even if the electrode extension RM _ E is not included. Since the number of electrodes RME1_1 and RME2_1 transmitted for alignment signals Signal1 and Signal2 aligned with the light emitting element ED is reduced, the display device 10 may prevent a short circuit between the electrodes RME1_1 and RME2_1, and may have various electrode structures.

In each of the electrodes RME1 and RME2 of the display device 10, the portion disposed in each of the emission areas EMA may be designed in various modified structures as long as one electrode trunk portion RM _ S is disposed in each of the sub-pixels PXn. In each of the electrodes RME1 and RME2 of the display device 10 according to this embodiment, the structure and the number of the electrode extending portions RM _ E or the electrode facing portions RM _ F1 or RM _ F2 arranged in each emission area EMA may be changed, and a plurality of light emitting elements ED connected in series to each other may be included in one sub-pixel PXn.

Fig. 12 is a plan view of a pixel of the display device 10 according to the embodiment. Fig. 13 is a plan view of the first and second type subpixels PXA and PXB of fig. 12. Fig. 14 is a plan view illustrating one operation in the process of manufacturing the display device 10 of fig. 12. Fig. 14 illustrates an operation of aligning the light emitting elements ED during the manufacturing process of the display device 10.

Referring to fig. 12 to 14, each electrode RME _2(RME1_2 or RME2_2) of the display device 10 may include an electrode stem portion RM _ S and a plurality of electrode extension portions RM _ E1 and RM _ E2 connected to the electrode stem portion RM _ S. Since one electrode RME _2 includes more electrode extension portions RM _ E1 and RM _ E2, more space in which the light emitting element ED can be arranged can be secured in each sub-pixel PXn. Each subpixel PXn may include the light emitting element ED whose ends are disposed on different electrode extensions RM _ E1 and RM _ E2, and the structures of the contact electrodes CNE1_2, CNE2_2, and CNE3_2 may be designed to connect the light emitting elements ED in series. The present embodiment is different from the embodiment of fig. 8 in the structures of the electrodes RME1_2 and RME2_2 and the contact electrodes CNE1_2, CNE2_2 and CNE3_2 and the arrangement of the light emitting element ED. Hereinafter, any redundant description will be omitted, and differences will be mainly described.

Each of the first and second electrodes RME1_2 and RME2_2 includes an electrode trunk portion RM _ S and first and second electrode extension portions RM _ E1 and RM _ E2 connected to the electrode trunk portion RM _ S. According to an embodiment, one electrode RME1_2 or RME2_2 includes an electrode trunk portion RM _ S and a plurality of electrode extension portions RM _ E1 and RM _ E2 arranged over different sub-pixels PXn.

The electrode stem portions RM _ S are arranged in substantially the same manner as in the embodiment of fig. 8. The electrode trunk portion RM _ S of the first electrode RME1_2 extends in the second direction DR2 in the first-type sub-pixel PXA, and the electrode trunk portion RM _ S of the second electrode RME2_2 extends in the second direction DR2 in the second-type sub-pixel PXB. The electrode stem portion RM _ S of the first electrode RME1_2 may be connected to the second voltage wiring VL2 through the second contact hole CT2, and the electrode stem portion RM _ S of the second electrode RME2_2 may be arranged in a floating state.

The first electrode extensions RM _ E1 may be arranged in the same manner as in the embodiment of fig. 8, but the length of the first electrode extensions RM _ E1 measured in the second direction DR2 may be short. The first electrode extension portion RM _ E1 is connected to one side of the electrode stem portion RM _ S in the first direction DR1 and has a wider width. The first electrode extension portion RM _ E1 may protrude from the side of the electrode stem portion RM _ S toward the first side of the first direction DR1, and may be arranged over another sub-pixel PXn adjacent in the first direction DR 1.

The second electrode extension RM _ E2 may be arranged in an opposite direction to the first electrode extension RM _ E1. The second electrode extension portion RM _ E2 is connected to the other side of the electrode stem portion RM _ S and protrudes toward the second side of the first direction DR 1. For example, in the case of the second sub-pixel PX2, the electrode trunk portion RM _ S of the second electrode RME2_2 is arranged in the second sub-pixel PX2 and extends in the second direction DR 2. The first electrode extension portion RM _ E1 of the second electrode RME2_2 protrudes toward the first side of the first direction DR1 and is disposed across the boundary with the third subpixel PX3, and the second electrode extension portion RM _ E2 protrudes toward the second side of the first direction DR1 and is disposed across the boundary with the first subpixel PX 1. In a plan view, the first electrode extension parts RM _ E1 and the second electrode extension parts RM _ E2 may protrude toward different subpixels PXn and may be staggered in one subpixel PXn. The first electrode extension portion RM _ E1 of the second electrode RME2_2 may be spaced apart from the electrode stem portion RM _ S of the first electrode RME1_2 disposed in the third sub-pixel PX3, and the second electrode extension portion RM _ E2 may be spaced apart from the electrode stem portion RM _ S of the first electrode RME1_2 disposed in the first sub-pixel PX 1. In each emission region EMA, a first electrode extension portion RM _ E1 and a second electrode extension portion RM _ E2 spaced apart from each other in the second direction DR2 may be arranged.

The plurality of first banks BNL1 may be arranged to overlap the electrode trunk portion RM _ S of each sub-pixel PXn or the protruding sides of the electrode extension portions RM _ E1 and RM _ E2. The first bank BNL1 overlapping the electrode trunk portion RM _ S may have a length in the second direction DR2 greater than the first bank BNL1 overlapping the protruding sides of the electrode extension portions RM _ E1 and RM _ E2.

In the emission area EMA of each sub-pixel PXn, one electrode trunk portion RM _ S and two electrode extension portions RM _ E1 and RM _ E2 are spaced apart from each other. The electrode trunk portion RM _ S and the first electrode extension portion RM _ E1 of the other electrode are spaced apart from each other on the upper side of the center of the emission area EMA, and the light emitting element ED _ a or ED _ B is arranged between the electrode trunk portion RM _ S and the first electrode extension portion RM _ E1 of the other electrode. In addition, the electrode stem portion RM _ S and the second electrode extension portion RM _ E2 of the other electrode are spaced apart from each other on the lower side of the center of the emission area EMA, and the light emitting element ED _ C or ED _ D may also be disposed between the electrode stem portion RM _ S and the second electrode extension portion RM _ E2 of the other electrode.

For example, in the first sub-pixel PX1, which is the first-type sub-pixel PXA, a first light emitting element ED _ a having a first end disposed on the electrode trunk portion RM _ S of the first electrode RME1_2 and a second end disposed on the first electrode extension portion RM _ E1 of the second electrode RME2_2 may be disposed. In the second sub-pixel PX2 as the second-type sub-pixel PXB, a second light emitting element ED _ B having a first end disposed on the first electrode extension portion RM _ E1 of the first electrode RME1_2 and a second end disposed on the electrode trunk portion RM _ S of the second electrode RME2_2 may be disposed. In addition, in the first sub-pixel PX1, a third light emitting element ED _ C may be disposed, the third light emitting element ED _ C having a first end disposed on the electrode trunk portion RM _ S of the first electrode RME1_2 and a second end disposed on the second electrode extension portion RM _ E2 of the second electrode RME2_ 2. In the second sub-pixel PX2, a fourth light emitting element ED _ D may be disposed, the fourth light emitting element ED _ D having a first end disposed on the second electrode extension portion RM _ E2 of the first electrode RME1_2 and a second end disposed on the electrode trunk portion RM _ S of the second electrode RME2_ 2.

The first-type light emitting element ED1 arranged in the first-type subpixel PXA includes a first light emitting element ED _ a and a third light emitting element ED _ C, and the second-type light emitting element ED2 arranged in the second-type subpixel PXB includes a second light emitting element ED _ B and a fourth light emitting element ED _ D. According to an embodiment, since the different electrode extension portions RM _ E1 and RM _ E2 are disposed at both sides of the electrode stem portion RM _ S and spaced apart from each other, the first end of the first light emitting element ED _ a and the first end of the third light emitting element ED _ C may face opposite directions. In addition, the first end of the second light emitting element ED _ B and the first end of the fourth light emitting element ED _ D may face opposite directions. Similar to the interleaving of the electrode extension portions RM _ E1 and RM _ E2, the different light emitting elements ED _ a or ED _ B and ED _ C or ED _ D arranged in each sub-pixel PXn may be interleaved in the emission area EMA in a plan view. That is, the region where the first light emitting elements ED _ a and the region where the third light emitting elements ED _ C are arranged may be staggered with each other in the second direction DR 2.

As illustrated in fig. 14, when the first alignment Signal1 is transmitted to the first electrode RME1_2 of the first-type sub-pixel PXA and the second alignment Signal2 is transmitted to the second electrode RME2_2 of the second-type sub-pixel PXB, electric fields EF1 and EF2 may be generated between each electrode trunk portion RM _ S and the electrode extension portions RM _ E1 and RM _ E2 in a direction toward the electrode to which the second alignment Signal2 is transmitted. Since the electrode extension portions RM _ E1 and RM _ E2 are disposed at one side and the other side of the electrode trunk portion RM _ S in the first direction DR1 in each subpixel PXn, the first electric field EF1 and the second electric field EF2 may be generated in each subpixel PXn. When the electric fields EF1 and EF2 facing opposite directions are generated in one subpixel PXn, the light emitting element ED of each subpixel PXn may include a plurality of light emitting elements ED _ a or ED _ B and ED _ C or ED _ D whose first ends face opposite directions.

When the light emitting elements ED in each sub-pixel PXn are arranged in different spaces, the arrangement of the contact electrodes CNE1_2, CNE2_2, and CNE3_2 connecting the light emitting elements ED may be designed to connect the light emitting elements ED in series. According to the embodiment, each subpixel PXn may include a first contact electrode CNE1_2 contacting the first electrode RME1_2 and a first end of one group of light emitting elements, a second contact electrode CNE2_2 contacting the electrode contact portion EP and a second end of another group of light emitting elements, and a third contact electrode CNE3_2 contacting a second end and a first end of a different group of light emitting elements.

For example, in the first-type subpixel PXA, the first contact electrode CNE1_2 may contact the electrode stem portion RM _ S of the first electrode RME1_2 through the first opening OP1 and contact the first end of the third light emitting element ED _ C. The second contact electrode CNE2_2 may contact the electrode contact portion EP through the second opening OP2 and may contact the second end of the first light emitting element ED _ a. The first power voltage may be transmitted to the second terminal of the first light emitting element ED _ a through the second contact electrode CNE2_2, and the second power voltage may be transmitted to the first terminal of the third light emitting element ED _ C through the first contact electrode CNE1_ 2.

The third contact electrode CNE3_2 may contact a first end of the first light emitting element ED _ a and a second end of the third light emitting element ED _ C. The third contact electrode CNE3_2 may include a portion disposed on the electrode trunk portion RM _ S of the first electrode RME1_2 and a portion disposed on the second electrode extension portion RM _ E2 of the second electrode RME2_2, and further include a connection portion connecting them. The third contact electrode CNE3_2 may not directly contact each electrode RME1_2 or RME2_2, but may contact only the light emitting element ED. The first and second power supply voltages respectively applied to the second and first contact electrodes CNE2_2 and CNE1_2 may flow through the third contact electrode CNE3_2, and the light emitting element ED _ a or ED _ B and ED _ C or ED _ D arranged in each sub-pixel PXn may be connected in series to each other.

According to the present embodiment, since the light emitting elements ED arranged in each sub-pixel PXn are connected in series, the amount of light emitted per unit area can be increased, and luminance and light emitting efficiency can be improved. In addition, since the electrode extension portions RM _ E1 and RM _ E2 of each electrode RME1_2 or RME2_2 are interleaved, the regions where the light emitting elements ED _ a or ED _ B and ED _ C or ED _ D are arranged may also be interleaved. Due to the staggered arrangement of the electrode extension portions RM _ E1 and RM _ E2, the first end of the first light emitting element ED _ a and the second end of the third light emitting element ED _ C may be arranged to face the same direction, and the third contact electrode CNE3_2 may contact the ends of the different light emitting elements ED _ a or ED _ B and ED _ C or ED _ D without crossing the electrode stem portion RM _ S. In the display device 10 according to this embodiment, the structure of each electrode RME1_2 or RME2_2 may be designed as in the current embodiment to connect a plurality of light emitting elements ED in series in each sub-pixel PXn and to minimize the space wasted by the contact electrodes connecting the light emitting elements ED. That is, a contact electrode for series connection or a space required due to the contact electrode is not required in each sub-pixel PXn, and a region where the light emitting element ED is not arranged can be sufficiently secured in each emission region EMA.

Fig. 15 is a plan view of a pixel of the display device 10 according to the embodiment.

Referring to fig. 15, in the display device 10 according to this embodiment, the first electrode RME1_3 includes a first electrode trunk portion RM _ S1, a plurality of first electrode facing portions RM _ F1, and a plurality of electrode connecting portions RM _ B connecting the first electrode facing portions RM _ F1 to the first electrode trunk portion RM _ S1. The second electrode RME2_3 includes a second electrode trunk portion RM _ S2, a plurality of second electrode facing portions RM _ F2, and a plurality of electrode separating portions RM _ D connected to the second electrode facing portion RM _ S2 but separated from the second electrode trunk portion RM _ S2. The current embodiment is similar to the embodiment of fig. 10 in the shape of each electrode RME1_3 or RME2_3, but each electrode RME1_3 or RME2_3 may include a plurality of electrode facing portions RM _ F1 or RM _ F2 and a plurality of electrode connecting portions RM _ B or a plurality of electrode separating portions RM _ D, as in the embodiment of fig. 12. Accordingly, each subpixel PXn may include a plurality of light emitting elements ED _ a or ED _ B and ED _ C or ED _ D, and the light emitting elements ED _ a or ED _ B and ED _ C or ED _ D may be connected in series through the third contact electrode CNE3_ 3. The present embodiment can be derived by combining the embodiment of fig. 10 and the embodiment of fig. 12. Hereinafter, any redundant description will be omitted, and differences will be mainly described.

The first electrode RME1_3 includes a first electrode trunk portion RM _ S1, a first electrode facing portion RM _ F1, and an electrode connecting portion RM _ B connecting the first electrode trunk portion RM _ S1 and the first electrode facing portion RM _ F1. The first electrode facing portion RM _ F1 may be spaced apart from the second electrode stem portion RM _ S2 of the second electrode RME2_ 3.

The second electrode RME2_3 may include a second electrode stem portion RM _ S2, a second electrode facing portion RM _ F2, and an electrode separating portion RM _ D separated from the second electrode stem portion RM _ S2. The second electrode facing portion RM _ F2 may be spaced apart from the first electrode stem portion RM _ S1 of the first electrode RME1_ 3.

The second electrode facing portion RM _ F2 disposed in the first-type subpixel PXA may be connected to and integrated with the electrode contact portion EP. The second electrode trunk portion RM _ S2 arranged in the second-type subpixel PXB may also be connected to and integrated with the electrode contact portion EP. The electrode contact portion EP may be electrically connected to the first transistor T1 to receive a first power supply voltage, and the first power supply voltage may be transmitted to the second electrode facing portion RM _ F2 or the second electrode stem portion RM _ S2. Since the second electrode trunk part RM _ S2 is divided in the cut part CB of the cut region CBA, the first power supply voltage applied to the electrode contact part EP may not be transmitted to another subpixel PXn.

The first and third light emitting elements ED _ a and ED _ C of the first type light emitting element ED1 have a first end disposed on the first electrode trunk portion RM _ S1 and a second end disposed on the second electrode facing portion RM _ F2. The second and fourth light emitting elements ED _ B and ED _ D of the second type light emitting element ED2 have first ends disposed on the first electrode facing portion RM _ F1 and second ends disposed on the second electrode trunk portion RM _ S2.

The first contact electrode CNE1_3 may be disposed on the first electrode stem portion RM _ S1 to contact the first end of the third light emitting element ED _ C and contact the first electrode stem portion RM _ S1 through the first opening OP 1. The first contact electrode CNE1_3 may be disposed on the first electrode facing portion RM _ F1 to contact the first end of the fourth light emitting element ED _ D and contact the first electrode facing portion RM _ F1 through the first opening OP 1. The second contact electrode CNE2_3 may be disposed on the second electrode facing portion RM _ F2 to contact the second end of the first light emitting element ED _ a and contact the second electrode facing portion RM _ F2 through the second opening OP 2. The second contact electrode CNE2_3 may be disposed on the second electrode stem portion RM _ S2 to contact the second end of the second light emitting element ED _ B and contact the second electrode stem portion RM _ S2 through the second opening OP 2.

The second power supply voltage may be applied to the first contact electrode CNE1_3 through the first electrode RME1_3, and the first power supply voltage may be applied to the second contact electrode CNE2_3 through the second electrode trunk portion RM _ S2 or the second electrode facing portion RM _ F2 connected to or integrated with the electrode contact portion EP.

The third contact electrode CNE3_3 may contact a first end of the first light emitting element ED _ a and a second end of the third light emitting element ED _ C. The third contact electrode CNE3_3 may contact a first end of the second light emitting element ED _ B and a second end of the fourth light emitting element ED _ D. The third contact electrode CNE3_3 may be disposed on the second electrode facing portion RM _ F2 disposed in the first type subpixel PXA, and may contact the second electrode facing portion RM _ F2 through the third opening OP 3. The second electrode facing portion RM _ F2 may be separated from the second electrode stem portion RM _ S2, and thus may be in a floating state. However, since the second electrode facing portion RM _ F2 is connected to the third contact electrode CNE3_3, the second electrode facing portion RM _ F2 may not float when the first-type sub-pixel PXA emits light. In contrast, a predetermined voltage may be applied to the second electrode facing portion RM _ F2. Other details are substantially the same as those described above.

Fig. 16 is a plan view of a pixel of the display device 10 according to the embodiment.

Referring to fig. 16, in the display device 10, each electrode RME _4(RME1_4 or RME2_4) may further include more electrode extensions RM _ E1, RM _ E2, and RM _ E3, and each sub-pixel PXn may include more light emitting elements ED and more contact electrodes CNE1_4, CNE2_4, CNE3_4, and CNE4_ 4. The current embodiment is different from the embodiment of fig. 12 in that the electrode RME1_4 or RME2_4 further includes a third electrode extension RM _ E3. Hereinafter, any redundant description will be omitted, and the added third electrode extension portion RM _ E3, fourth contact electrode CNE4_4, and fifth and sixth light emitting elements ED _ E and ED _ F will be described.

The third electrode extension RM _ E3 is arranged in substantially the same shape as the first electrode extension RM _ E1. In a plan view, the first, second, and third electrode extension portions RM _ E1, RM _ E2, and RM _ E3 may be sequentially arranged along a direction in which the electrode stem portion RM _ S extends, but may be staggered in the second direction DR 2. That is, the first and third electrode extension portions RM _ E1 and RM _ E3 may protrude toward a first side of the first direction DR1, and the second electrode extension portion RM _ E2 may protrude toward a second side of the first direction DR 1.

The plurality of first banks BNL1 may be arranged to overlap the electrode trunk portion RM _ S of each sub-pixel PXn or the protruding sides of the electrode extension portions RM _ E1, RM _ E2, and RM _ E3. The first bank BNL1 overlapping the electrode trunk portion RM _ S may have a length in the second direction DR2 greater than the first bank BNL1 overlapping the protruding sides of the electrode extensions RM _ E1, RM _ E2, and RM _ E3.

In the first type subpixel PXA, the third electrode extension portion RM _ E3 of the second electrode RME2_4 is spaced apart from the electrode trunk portion RM _ S of the first electrode RME1_4, and the fifth light emitting element ED _ E is disposed thereon. A first end of the fifth light emitting element ED _ E is disposed on the electrode stem portion RM _ S of the first electrode RME1_4, and a second end is disposed on the third electrode extension portion RM _ E3 of the second electrode RME2_ 4. In the second-type sub-pixel PXB, the third electrode extension portion RM _ E3 of the first electrode RME1_4 is spaced apart from the electrode trunk portion RM _ S of the second electrode RME2_4, and the sixth light emitting element ED _ F is disposed thereon. A first end of the sixth light emitting element ED _ F is disposed on the third electrode extension portion RM _ E3 of the first electrode RME1_4, and a second end is disposed on the electrode stem portion RM _ S of the second electrode RME2_ 4.

The first contact electrode CNE1_4 is disposed on the electrode trunk portion RM _ S or the third electrode extension portion RM _ E3 of the first electrode RME1_ 4. The first contact electrode CNE1_4 may contact the first end of the fifth light emitting element ED _ E and contact the electrode stem portion RM _ S of the first electrode RME1_4 through the first opening OP 1. The first contact electrode CNE1_4 may contact the first end of the sixth light emitting element ED _ F and contact the third electrode extension portion RM _ E3 of the first electrode RME1_4 through the first opening OP 1.

The second contact electrode CNE2_4 is disposed on the electrode trunk portion RM _ S or the first electrode extension portion RM _ E1 of the second electrode RME2_ 4. The second contact electrode CNE2_4 may contact the second end of the first light emitting element ED _ a and contact the electrode contact portion EP through the second opening OP 2. The second contact electrode CNE2_4 may contact the second end of the second light emitting element ED _ B and contact the electrode contact portion EP through the second opening OP 2.

The third contact electrode CNE3_4 may be disposed over the electrode stem portion RM _ S of the first electrode RME1_4 and the second electrode extension portion RM _ E2 of the second electrode RME2_4, or may be disposed over the first electrode extension portion RM _ E1 of the first electrode RME1_4 and the electrode stem portion RM _ S of the second electrode RME2_ 4. The third contact electrode CNE3_4 is arranged to contact the first end of the first light emitting element ED _ a and the second end of the third light emitting element ED _ C. The third contact electrode CNE3_4 is arranged to contact a first end of the second light emitting element ED _ B and a second end of the fourth light emitting element ED _ D.

The fourth contact electrode CNE4_4 may be disposed over the electrode stem portion RM _ S of the first electrode RME1_4 and the third electrode extension portion RM _ E3 of the second electrode RME2_4, or may be disposed over the electrode stem portion RM _ S of the second electrode RME2_4 and the second electrode extension portion RM _ E2 of the first electrode RME1_ 4. The fourth contact electrode CNE4_4 is arranged to contact a first end of the third light emitting element ED _ C and a second end of the fifth light emitting element ED _ E. The fourth contact electrode CNE4_4 is arranged to contact a first end of the fourth light emitting element ED _ D and a second end of the sixth light emitting element ED _ F.

In the display device 10 according to this embodiment, since each electrode RME1_4 or RME2_4 further includes the third electrode extension RM _ E3, the light emitting elements ED may be arranged in a 3-series structure in each sub-pixel PXn. The luminance per unit area of the display device 10 can be further improved.

Fig. 17 is a plan view of a pixel of the display device 10 according to the embodiment.

Referring to fig. 17, the display device 10 according to this embodiment is different from the embodiment of fig. 16 in that the second electrode RME2_5 includes a plurality of electrode patterns RM _ P1, RM _ P2, and RM _ P3 separated from the second electrode stem portion RM _ S2. The current embodiment is the same as the embodiment of fig. 16 in that the first electrode RME1_5 includes a first electrode trunk portion RM _ S1 and a plurality of electrode extension portions RM _ E1, RM _ E2, and RM _ E3, but is different from the embodiment of fig. 16 in that the second electrode RME2_5 has a shape similar to that of the embodiment of fig. 15. Hereinafter, any redundant description will be omitted, and the second electrode RME2_5 will be described.

The second electrode RME2_5 includes a second electrode stem portion RM _ S2 and electrode patterns RM _ P1, RM _ P2, and RM _ P3 separated from the second electrode stem portion RM _ S2. The second electrode trunk portion RM _ S2 is arranged in the second-type subpixel PXB to extend in the second direction DR2, but is divided in the cut part CB of the cut region CBA. The second electrode trunk portion RM _ S2 may be connected to the electrode contact portion EP, but the first power voltage applied to the electrode contact portion EP may not be transmitted to another subpixel PXn.

The first and third electrode patterns RM _ P1 and RM _ P3 of the second electrode RME2_5 are separated from one side of the second electrode trunk portion RM _ S2 and are disposed over another subpixel PXn positioned at the first side of the first direction DR 1. The second electrode pattern RM _ P2 of the second electrode RME2_5 is separated from the other side of the second electrode trunk portion RM _ S2 and is disposed over the other sub-pixel PXn located at the second side of the first direction DR 1. In the case of the second sub-pixel PX2, the first and third electrode patterns RM _ P1 and RM _ P3 may be disposed in the third sub-pixel PX3, and the second electrode pattern RM _ P2 may be disposed in the first sub-pixel PX 1. Each of the electrode patterns RM _ P1, RM _ P2, and RM _ P3 may be spaced apart from the first electrode stem portion RM _ S1 of the first electrode RME1_ 5. However, the first electrode pattern RM _ P1 of the second electrode RME2_5 may be connected to or integrated with the electrode contact portion EP arranged in the first type subpixel PXA to receive the first power supply voltage.

The fifth light emitting element ED _ E of the first-type subpixel PXA has a first end disposed on the first electrode trunk portion RM _ S1 of the first electrode RME1_5 and a second end disposed on the third electrode pattern RM _ P3 of the second electrode RME2_ 5. The sixth light emitting element ED _ F of the second-type subpixel PXB has a first end disposed on the third electrode extension RM _ E3 of the first electrode RME1_5 and a second end disposed on the second electrode trunk portion RM _ S2 of the second electrode RME2_ 5.

The first contact electrode CNE1_5 is disposed on the first electrode trunk portion RM _ S1 or the third electrode extension portion RM _ E3 of the first electrode RME1_ 5. The second contact electrode CNE2_5 is disposed on the second electrode stem portion RM _ S2 or the first electrode pattern RM _ P1 of the second electrode RME2_ 5.

The third contact electrode CNE3_5 may be disposed over the first electrode stem portion RM _ S1 of the first electrode RME1_5 and the second electrode pattern RM _ P2 of the second electrode RME2_5, or may be disposed over the first electrode extension portion RM _ E1 of the first electrode RME1_5 and the second electrode stem portion RM _ S2 of the second electrode RME2_ 5. The fourth contact electrode CNE4_5 may be disposed over the first electrode stem portion RM _ S1 of the first electrode RME1_5 and the third electrode pattern RM _ P3 of the second electrode RME2_5, or may be disposed over the second electrode stem portion RM _ S2 of the second electrode RME2_5 and the second electrode extension portion RM _ E2 of the first electrode RME1_ 5.

The contact relationship between the contact electrode and the light emitting element ED is substantially the same as that of the embodiment of fig. 16.

In the display device 10 including the electrode stem portion RM _ S and the electrode extension portions RM _ E1, RM _ E2, and RM _ E3 or the electrode patterns RM _ P1, RM _ P2, and RM _ P3 connected to the electrode stem portion RM _ S, portions of the electrodes RME1_5 or RME2_5 arranged in each subpixel PXn may be interleaved with each other. When each of the electrodes RME1_5 or RME2_5 includes the electrode extension portions RM _ E1, RM _ E2, and RM _ E3 as in the embodiment of fig. 16, the electrode extension portions RM _ E1, RM _ E2, and RM _ E3 may protrude in opposite directions, and the electrode extension portions RM _ E1, RM _ E2, and RM _ E3 of each of the first and second electrodes RME1_5 and RME2_5 may be interleaved with each other in a plan view. The structure of each electrode RME may be designed such that more light emitting elements ED and more contact electrodes CNE are arranged per unit area of the sub-pixel PXn. The display device 10 according to this embodiment may be designed such that the electrode trunk portion RM _ S of each of the first electrode RME1 and the second electrode RME2 is arranged in one sub-pixel PXn, and more light emitting elements ED and more contact electrodes CNE are arranged with respect to the area of the sub-pixel PXn.

Fig. 18 is a plan view of a pixel of the display device 10 according to the embodiment.

Referring to fig. 18, in the display device 10 according to this embodiment, the respective electrode trunk portions RM _ S1 and RM _ S2 of the first and second electrodes RME1_6 and RME2_6 may be disposed in the same subpixel PXn. The first and second electrodes RME1_6 and RME2_6 may include electrode extension portions RM _ E1, RM _ E2, RM _ E3, and RM _ E4. Some of the electrode extensions RM _ E1, RM _ E2, RM _ E3, and RM _ E4 may be arranged in the corresponding subpixel PXn, and the other extension portions may be arranged in another subpixel PXn adjacent in the first direction DR 1. The present embodiment is different from the other embodiments in that, as the structures and the arrangements of the electrodes RME1_6 and RME2_6 are changed, the arrangements of the light emitting elements ED and the contact electrodes are also changed. Hereinafter, any redundant description will be omitted, and the disposition relationship between the light emitting element ED and the contact electrode will be described based on the structures of the first electrode RME1_6 and the second electrode RME2_ 6.

The first electrode trunk portion RM _ S1 of the first electrode RME1_6 and the second electrode trunk portion RM _ S2 of the second electrode RME2_6 may be arranged in each subpixel PXn to extend in the second direction DR 2. The first electrode stem portion RM _ S1 and the second electrode stem portion RM _ S2 may be disposed above the emission region EMA and the cutting region CBA. The first and second electrode stem portions RM _ S1 and RM _ S2 may be spaced apart from each other in the first direction DR 1. Some of the electrode extension portions RM _ E1, RM _ E2, RM _ E3, and RM _ E4 may be disposed between the first and second electrode stem portions RM _ S1 and RM _ S2, and the light emitting element ED may be disposed between the electrode extension portions RM _ E1, RM _ E2, RM _ E3, and RM _ E4 and the electrode stem portions RM _ S1 and RM _ S2.

The first electrode stem portion RM _ S1 may be electrically connected to the second voltage wiring VL2 through the second contact hole CT2, and the second electrode stem portion RM _ S2 may be arranged in a floating state without being connected to a circuit layer therebelow. The first electrode trunk portion RM _ S1 may not be connected to the circuit layer therebelow.

The first electrode extension portion RM _ E1 of the first electrode RME1_6 protrudes from a first side of the first electrode stem portion RM _ S1 in the first direction DR1, and is disposed between the first electrode stem portion RM _ S1 and the second electrode stem portion RM _ S2. The second electrode extension portion RM _ E2 of the first electrode RME1_6 protrudes from a second side of the first electrode trunk portion RM _ S1 in the first direction DR1, and is disposed between the first electrode trunk portion RM _ S1 and the second electrode trunk portion RM _ S2 disposed in another subpixel PXn. The second electrode extension portion RM _ E2 may be arranged over the sub-pixels PXn adjacent in the first direction DR 1. The first electrode extension RM _ E1 and the second electrode extension RM _ E2 may protrude in a staggered manner so as not to overlap each other in the second direction DR 2.

The third electrode extension portion RM _ E3 of the second electrode RME2_6 protrudes from a second side of the second electrode stem portion RM _ S2 in the first direction DR1, and is disposed between the first electrode stem portion RM _ S1 and the second electrode stem portion RM _ S2. The third electrode extension RM _ E3 may be spaced apart from the first electrode extension RM _ E1 in the second direction DR 2. The fourth electrode extension portion RM _ E4 of the second electrode RME2_6 protrudes from the first side of the second electrode trunk portion RM _ S2 in the first direction DR1, and is disposed between the second electrode trunk portion RM _ S2 and the first electrode trunk portion RM _ S1 disposed in another subpixel PXn. The fourth electrode extension RM _ E4 may be arranged over the sub-pixels PXn adjacent in the first direction DR 1. The third electrode extension RM _ E3 and the fourth electrode extension RM _ E4 may protrude in a staggered manner so as not to overlap each other in the second direction DR 2.

In the first direction DR1, the widths of the first and third electrode extension portions RM _ E1 and RM _ E3 may be smaller than the widths of the second and fourth electrode extension portions RM _ E2 and RM _ E4. In addition, the first and fourth electrode extensions RM _ E1 and RM _ E4 may be staggered from each other in the first direction DR 1.

The first electrode extension portion RM _ E1 and the second electrode stem portion RM _ S2 may be spaced apart from each other, the second electrode extension portion RM _ E2 and the second electrode stem portion RM _ S2 may be spaced apart from each other, and the light emitting element ED may be disposed therebetween. In addition, the third electrode extension portion RM _ E3 and the first electrode stem portion RM _ S1 may be spaced apart from each other, the fourth electrode extension portion RM _ E4 and the first electrode stem portion RM _ S1 may be spaced apart from each other, and the light emitting element ED may be disposed therebetween.

An electrode contact portion EP spaced apart from each of the first electrode trunk portion RM _ S1 and the second electrode extension portion RM _ E2 is arranged in each sub-pixel PXn. The position of the electrode contact portion EP is the same as described above.

The light emitting element ED has a first end disposed on the first electrode RME1_6 and a second end disposed on the second electrode RME2_ 6. For example, the first end of the light emitting element ED may be disposed on the first electrode stem portion RM _ S1, the first electrode extension portion RM _ E1, or the second electrode extension portion RM _ E2, and the second end may be disposed on the second electrode stem portion RM _ S2, the third electrode extension portion RM _ E3, or the fourth electrode extension portion RM _ E4.

The first light emitting element ED _ a is disposed on the first electrode trunk portion RM _ S1 and the fourth electrode extension portion RM _ E4. The second light emitting element ED _ B is disposed on the first electrode extension portion RM _ E1 and the second electrode stem portion RM _ S2, the third light emitting element ED _ C is disposed on the first electrode stem portion RM _ S1 and the third electrode extension portion RM _ E3, and the fourth light emitting element ED _ D is disposed on the second electrode extension portion RM _ E2 and the second electrode stem portion RM _ S2.

The first contact electrode CNE1_6 may be disposed on the first electrode extension RM _ E1 to contact the first end of the second light emitting element ED _ B. In addition, the first contact electrode CNE1_6 may directly contact the first electrode extension portion RM _ E1 through the first opening OP1 and transmit the second power voltage received through the first electrode RME1_6 to the second light emitting element ED _ B.

The second contact electrode CNE2_6 may be disposed on the fourth electrode extension RM _ E4 to contact the second end of the first light emitting element ED _ a. In addition, the second contact electrode CNE2_6 may directly contact the electrode contact portion EP through the second opening OP2 and transmit the first power voltage received through the electrode contact portion EP to the first light emitting element ED _ a.

The third contact electrode CNE3_6 may be disposed over the first electrode stem portion RM _ S1 and the third electrode extension portion RM _ E3 and may contact the first end of the first light emitting element ED _ a and the second end of the third light emitting element ED _ C. The fourth contact electrode CNE4_6 may be disposed over the first and second electrode stem portions RM _ S1 and RM _ S2 and may contact the first end of the third and fourth light emitting elements ED _ C and ED _ D. The fourth contact electrode CNE4_6 may bypass the portion of the third contact electrode CNE3_6 disposed on the third electrode extension portion RM _ E3 to surround the portion. The fifth contact electrode CNE5_6 may be disposed over the second electrode extension portion RM _ E2 and the second electrode stem portion RM _ S2, and may contact the first end of the fourth light emitting element ED _ D and the second end of the second light emitting element ED _ B.

The first, second, third, and fourth light emitting elements ED _ a, ED _ B, ED _ C, and ED _ D may be connected to each other through contact electrodes CNE1_6, CNE2_6, CNE3_6, CNE4_6, and CNE5_ 6. The display device 10 including the electrodes RME1_6 and RME2_6 and the contact electrodes CNE1_6, CNE2_6, CNE3_6, CNE4_6, and CNE5_6 may have a 4-series structure in each subpixel PXn.

Fig. 19 is a plan view of a pixel of the display device 10 according to the embodiment.

Referring to fig. 19, in the display device 10, the second electrode stem portion RM _ S2 of the second electrode RME2_7 may be divided in the cut part CB of the cut region CBA, and the second electrode RME2_7 may include a first electrode pattern RM _ P1, the first electrode pattern RM _ P1 being separated from the second electrode stem portion RM _ S2 and being disposed over the sub-pixels PXn adjacent in the first direction DR 1. The current embodiment is different from the embodiment of fig. 18 in that the fourth electrode extending portion RM _ E4 of the second electrode RME2_7 is replaced with a first electrode pattern RM _ P1 separated from the second electrode trunk portion RM _ S2. The arrangement of the first electrode RME1_7, the plurality of contact electrodes CNE1_7, CNE2_7, CNE3_7, CNE4_7, and CNE5_7, and the light emitting element ED are substantially the same as those of the embodiment of fig. 18. Therefore, any redundant description will be omitted, and the structure of the second electrode RME2_7 will be described below.

The first electrode pattern RM _ P1 of the second electrode RME2_7 may be integrated with the electrode contact portion EP disposed in each sub-pixel PXn. A first power voltage may be applied to the first electrode pattern RM _ P1 through the electrode contact portion EP. The second contact electrode CNE2_7 may be disposed on the first electrode pattern RM _ P1 to directly contact the first electrode pattern RM _ P1 through the second opening OP 2. The first power voltage applied to the first electrode pattern RM _ P1 may be transmitted to the second terminal of the first light emitting element ED _ a through the second contact electrode CNE2_ 7.

Since the second electrode stem portion RM _ S2 is divided in the cutting portion CB of the cutting region CBA and the cutting portion CB of the transmission region EMA, an electrical signal may not be directly transmitted from the circuit layer. However, the portion of the third contact electrode CNE3_7 disposed on the third electrode extension portion RM _ E3 may directly contact the third electrode extension portion RM _ E3 through the third opening OP3, and an electrical signal flowing through the third contact electrode CNE3_7 may be transmitted to the second electrode stem portion RM _ S2. In the current embodiment, a first power voltage and a second power voltage for driving the light emitting element ED may flow through the second electrode RME2_7 and the first electrode RME1_7, respectively. Therefore, unlike in the embodiment of fig. 18, each electrode in each subpixel PXn may not be arranged in a floating state.

Fig. 20 is a plan view of a pixel of the display device 10 according to the embodiment.

Referring to fig. 20, the display device 10 is the same as the embodiment of fig. 18 in the structure of each electrode RME1_8 or RME2_8, but the contact electrodes CNE1_8, CNE2_8, and CNE3_8 arranged in each sub-pixel PXn may simultaneously contact different light emitting elements ED. The light emitting elements ED arranged in each subpixel PXn may be partially connected in series or in parallel with each other. The present embodiment is different from the embodiment of fig. 18 in that some of the light emitting elements ED are connected in parallel by changing the structures and arrangements of the contact electrodes CNE1_8, CNE2_8, and CNE3_ 8.

The first electrode extension portion RM _ E1 of the first electrode RME1_8 and the fourth electrode extension portion RM _ E4 of the second electrode RME2_8 may be arranged side by side in the first direction DR 1.

The light emitting element ED includes a first light emitting element ED _ a, a first end of which is disposed on the first electrode extension portion RM _ E1 or on the opposite side of the first electrode trunk portion RM _ S1 from the first electrode extension portion RM _ E1. The second ends of some of the first light emitting elements ED _ a are disposed on the fourth electrode extension portion RM _ E4, and the second ends of other first light emitting elements ED _ a are disposed on the second electrode stem portion RM _ S2. In addition, the light emitting element ED includes a second light emitting element ED _ B, a second end of which is disposed on the third electrode extension RM _ E3 or on the opposite side of the second electrode trunk portion RM _ S2 from the third electrode extension RM _ E3. First ends of some of the second light emitting elements ED _ B are disposed on the first electrode trunk portion RM _ S1, and first ends of other second light emitting elements ED _ B are disposed on the second electrode extension portion RM _ E2.

The first contact electrode CNE1_8 may be disposed on the first electrode stem portion RM _ S1 or the second electrode extension portion RM _ E2 to contact the first end of the second light emitting element ED _ B. The first contact electrode CNE1_8 may directly contact the first electrode stem portion RM _ S1 or the second electrode extension portion RM _ E2 through the first opening OP 1. The second power voltage applied to the first electrode RME1_8 may be transmitted to the first terminal of the second light emitting element ED _ B through the first contact electrode CNE1_ 8.

The second contact electrode CNE2_8 may be disposed over the second electrode stem portion RM _ S2 and the fourth electrode extension portion RM _ E4 and may contact the second end of the first light emitting element ED _ a. The second contact electrode CNE2_8 may be disposed on the electrode contact portion EP, and may contact the electrode contact portion EP through the second opening OP 2. The first power voltage applied to the electrode contact portion EP may be transmitted to the second terminal of the first light emitting element ED _ a through the second contact electrode CNE2_ 8.

The third contact electrode CNE3_8 may be disposed over the first electrode stem portion RM _ S1, the first electrode extension portion RM _ E1, the third electrode extension portion RM _ E3, and the second electrode stem portion RM _ S2, and may contact the first end of the first light emitting element ED _ a and the second end of the second light emitting element ED _ B.

Since the first and second light emitting elements ED _ a and ED _ B are connected through the third contact electrode CNE3_8, they may be connected in series with each other. The second ends of some of the first light emitting elements ED _ a may be disposed on the second electrode trunk portion RM _ S2 or the fourth electrode extension portion RM _ E4, but may simultaneously contact the second contact electrode CNE2_ 8. The first ends of some of the second light emitting elements ED _ B may be disposed on the first electrode trunk portion RM _ S1 or the second electrode extension portion RM _ E2, but may simultaneously contact the first contact electrode CNE1_ 8. Accordingly, the second power voltage may be applied through the first electrode RME1_ 8. Accordingly, the first light emitting elements ED _ a may be connected in parallel to each other, and the second light emitting elements ED _ B may be connected in parallel to each other. In the display device 10 according to this embodiment, by changing the structures of the electrodes RME1_8 and RME2_8 and the contact electrodes CNE1_8, CNE2_8 and CNE3_8, the light emitting elements ED can be connected in a 2-series 2-parallel structure.

Fig. 21 is a plan view of a pixel of the display device 10 according to the embodiment.

Referring to fig. 21, the display apparatus 10 is the same as the embodiment of fig. 19 in the structure of each electrode RME1_9 or RME2_9, but may be the same as the embodiment of fig. 20 in the arrangement of the contact electrodes CNE1_9, CNE2_9, and CNE3_9 arranged in each sub-pixel PXn. That is, the display device 10 of fig. 21 is different from the embodiment of fig. 19 in that some light emitting elements ED are connected in parallel by changing the structures and arrangements of the contact electrodes CNE1_9, CNE2_9, and CNE3_ 9. The embodiment of fig. 21 is different from the embodiment of fig. 20 in that the fourth electrode extension portion RM _ E4 of the second electrode RME2_9 is separated from the second electrode stem portion RM _ S2 and arranged as the first electrode pattern RM _ P1, and the second contact electrode CNE2_9 contacts each of the second electrode stem portion RM _ S2 and the first electrode pattern RM _ P1 through the third opening OP 3. Other details are the same as those described above.

In the display device according to the embodiment, one electrode is arranged over the adjacent sub-pixels. Accordingly, the number of electrode lines arranged over the entire display area of the display device may be reduced, thereby preventing potential short circuits between wirings.

In the display device, an emission area can be maximized, and light emitting elements can be connected in series. In the display device according to the embodiment, even if the unit area of each sub-pixel is minimized, the light emitting efficiency of each sub-pixel may be optimized. Therefore, a display device with ultra-high resolution can be realized.

Many variations and modifications may be made to the example embodiments without departing from the scope thereof as defined in the claims.