阅读说明：本技术 一种显示面板、显示装置及显示面板制作方法 (Display panel, display device and display panel manufacturing method ) 是由 覃宗伟 于 2018-09-13 设计创作，主要内容包括：本发明实施例公开了一种显示面板、显示装置及显示面板制作方法。该显示面板包括：阵列基板,以及设置于所述阵列基板上的多个发光单元；所述发光单元包括蓝色发光单元,所述蓝色发光单元采用无机发光二极管结构；所述发光单元还包括红色发光单元和绿色发光单元,所述红色发光单元和绿光单元采用有机发光二极管结构；所述蓝色发光单元为倒装结构。本发明实施例的方案提升了OLED显示面板的显示效果。(The embodiment of the invention discloses a display panel, a display device and a display panel manufacturing method. The display panel includes: the array substrate and the plurality of light-emitting units are arranged on the array substrate; the light emitting unit comprises a blue light emitting unit, and the blue light emitting unit adopts an inorganic light emitting diode structure; the light-emitting unit also comprises a red light-emitting unit and a green light-emitting unit, and the red light-emitting unit and the green light-emitting unit adopt organic light-emitting diode structures; the blue light emitting unit is of a flip-chip structure. The scheme of the embodiment of the invention improves the display effect of the OLED display panel.)

1. A display panel, comprising:

the array substrate and the plurality of light-emitting units are arranged on the array substrate;

the light emitting unit comprises a blue light emitting unit, and the blue light emitting unit adopts an inorganic light emitting diode structure;

the light-emitting unit also comprises a red light-emitting unit and a green light-emitting unit, and the red light-emitting unit and the green light-emitting unit adopt organic light-emitting diode structures;

the blue light emitting unit is of a flip-chip structure.

2. The display panel according to claim 1, characterized in that:

the blue light emitting unit includes a first electrode, an inorganic light emitting functional layer, and a second electrode;

the first electrode and the second electrode are both arranged on the surface of the array substrate, and the inorganic light-emitting functional layer is arranged on one side, far away from the array substrate, of the first electrode and the second electrode.

3. The display panel according to claim 2, characterized in that:

the inorganic light-emitting functional layer comprises a first inorganic layer, an inorganic light-emitting layer and a second inorganic layer which are sequentially stacked, the first electrode is connected with the first inorganic layer, and the second electrode is connected with the second inorganic layer.

4. The display panel according to claim 2, characterized in that:

the red light-emitting unit and the green light-emitting unit comprise a third electrode, an organic light-emitting functional layer and a fourth electrode which are sequentially stacked; the third electrode is arranged on one side of the organic light-emitting functional layer close to the array substrate.

5. The display panel according to claim 4, wherein:

the first electrode and the second electrode are arranged in the same layer with the third electrode.

6. The display panel according to claim 4, wherein:

the organic light-emitting functional layer comprises a hole injection layer, a hole transport layer, an organic light-emitting layer, an electron transport layer and an electron injection layer which are sequentially stacked; the hole injection layer is arranged on one side of the hole transport layer close to the third electrode.

7. A display device characterized by comprising the display panel according to any one of claims 1 to 6.

8. A method for manufacturing a display panel is characterized by comprising the following steps:

providing an array substrate;

arranging a plurality of light emitting units on the array substrate;

the light emitting unit comprises a blue light emitting unit, and the blue light emitting unit adopts an inorganic light emitting diode structure;

the light-emitting unit also comprises a red light-emitting unit and a green light-emitting unit, and the red light-emitting unit and the green light-emitting unit adopt organic light-emitting diode structures;

the blue light emitting unit is of a flip-chip structure.

9. The method of claim 8, wherein disposing a plurality of light emitting cells on the array substrate comprises:

arranging a first electrode, a second electrode and a third electrode on the array substrate;

arranging an inorganic light-emitting functional layer on one side of the first electrode and the second electrode, which is far away from the array substrate;

arranging an organic light-emitting functional layer on one side of the third electrode, which is far away from the array substrate;

a fourth electrode is arranged on one side, far away from the array substrate, of the organic light-emitting functional layer;

wherein the first electrode and the second electrode are formed in the same process as the third electrode.

10. The method of claim 9, wherein disposing an organic light-emitting functional layer on a side of the third electrode away from the array substrate comprises:

and sequentially evaporating a hole injection layer, a hole transport layer, an organic light-emitting layer, an electron transport layer and an electron injection layer on the surface of the third electrode.

Technical Field

The present invention relates to display technologies, and in particular, to a display panel, a display device, and a method for manufacturing the display panel.

Background

An Organic Light Emitting Diode (OLED) display panel is a self-luminous display panel, and compared with a Liquid Crystal Display (LCD), the OLED display does not need a backlight source, so that the OLED display panel is thinner and lighter.

However, the lifetime of the blue sub-pixel of the conventional OLED display panel is much shorter than the lifetimes of the red sub-pixel and the green sub-pixel, which may cause the white color coordinate to shift after the OLED display panel is used for a period of time, thereby affecting the display effect of the OLED display panel.

Disclosure of Invention

The invention provides a display panel, a display device and a display panel manufacturing method, which aim to improve the display effect of an OLED display panel.

In a first aspect, an embodiment of the present invention provides a display panel, including:

the array substrate and the plurality of light-emitting units are arranged on the array substrate;

the light emitting unit comprises a blue light emitting unit, and the blue light emitting unit adopts an inorganic light emitting diode structure;

the light-emitting unit also comprises a red light-emitting unit and a green light-emitting unit, and the red light-emitting unit and the green light-emitting unit adopt organic light-emitting diode structures;

the blue light emitting unit is of a flip-chip structure.

Optionally, the blue light emitting unit includes a first electrode, an inorganic light emitting functional layer and a second electrode

The first electrode and the second electrode are both arranged on the surface of the array substrate, and the inorganic light-emitting functional layer is arranged on one side, far away from the array substrate, of the first electrode and the second electrode.

Optionally, the inorganic light emitting functional layer includes a first inorganic layer, an inorganic light emitting layer, and a second inorganic layer, which are sequentially stacked, the first electrode is connected to the first inorganic layer, and the second electrode is connected to the second inorganic layer.

Optionally, the red light emitting unit and the green light emitting unit include a third electrode, an organic light emitting functional layer, and a fourth electrode that are sequentially stacked; the third electrode is arranged on one side of the organic light-emitting functional layer close to the array substrate.

Optionally, the first electrode and the second electrode are both disposed in the same layer as the third electrode.

Optionally, the organic light emitting functional layer includes a hole injection layer, a hole transport layer, an organic light emitting layer, an electron transport layer, and an electron injection layer, which are sequentially stacked; the hole injection layer is arranged on one side of the hole transport layer close to the third electrode.

In a second aspect, an embodiment of the present invention further provides a display device, where the display device includes the display panel according to any embodiment of the present invention.

In a third aspect, an embodiment of the present invention further provides a method for manufacturing a display panel, where the method includes:

providing an array substrate;

arranging a plurality of light emitting units on the array substrate;

the light emitting unit comprises a blue light emitting unit, and the blue light emitting unit adopts an inorganic light emitting diode structure;

the light-emitting unit also comprises a red light-emitting unit and a green light-emitting unit, and the red light-emitting unit and the green light-emitting unit adopt organic light-emitting diode structures;

the blue light emitting unit is of a flip-chip structure.

Optionally, a plurality of light emitting units are disposed on the array substrate, including:

arranging a first electrode, a second electrode and a third electrode on the array substrate;

arranging an inorganic light-emitting functional layer on one side of the first electrode and the second electrode, which is far away from the array substrate;

arranging an organic light-emitting functional layer on one side of the third electrode, which is far away from the array substrate;

a fourth electrode is arranged on one side, far away from the array substrate, of the organic light-emitting functional layer;

wherein the first electrode and the second electrode are formed in the same process as the third electrode.

Optionally, an organic light emitting function layer is disposed on a side of the third electrode away from the array substrate, and the organic light emitting function layer includes:

and sequentially evaporating a hole injection layer, a hole transport layer, an organic light-emitting layer, an electron transport layer and an electron injection layer on the surface of the third electrode.

According to the embodiment of the invention, the blue light-emitting unit of the display panel is arranged to adopt the inorganic light-emitting diode structure with slow attenuation and long service life, so that the attenuation of the blue light-emitting unit can be remarkably slowed down, the service life of the blue light-emitting unit is prolonged, the service life of the whole display panel is prolonged, the color cast of the display panel is prevented, and the display effect of the display panel is improved. In addition, because the electrode can not shelter from in the inorganic structure of flip-chip structure and give out light, adopt the flip-chip structure through setting up blue luminescence unit, can effectively promote blue luminescence unit's luminous efficacy, further improve display panel's life-span.

Drawings

Fig. 1 is a schematic diagram of a display panel according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of another display panel according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of another display panel according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of another display panel according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a display device according to an embodiment of the present invention;

fig. 6 is a flowchart of a method for manufacturing a display panel according to an embodiment of the present invention;

FIG. 7 is a flowchart illustrating a method for fabricating a display panel according to another embodiment of the present invention;

fig. 8 is a flowchart of a method for manufacturing a display panel according to another embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

Fig. 1 is a schematic diagram of a display panel according to an embodiment of the present invention, and referring to fig. 1, the display panel includes:

an array substrate 10, and a plurality of light emitting units 20 disposed on the array substrate 10;

the light emitting unit 20 includes a blue light emitting unit 21, and the blue light emitting unit 21 adopts an inorganic light emitting diode structure;

the light emitting unit further includes a red light emitting unit 22 and a green light emitting unit 23; the red light emitting unit 22 and the green light emitting unit 23 adopt an organic light emitting diode structure;

the blue light emitting unit 21 is a flip-chip structure.

The blue light-emitting unit of this embodiment adopts decay slow, longe-lived inorganic light-emitting diode structure, can show and slow down blue light-emitting unit decay, improves blue light-emitting unit life-span to improve whole display panel's life-span, prevent display panel colour cast, promote display panel's display effect. In addition, the red and green organic light emitting diode structures have longer service life, and the organic light emitting diode structures can be made smaller than the inorganic light emitting diode structures, which is beneficial to improving the pixel density of the display panel, so the red light emitting unit 22 and the green light emitting unit 23 adopt the organic light emitting diode structures. In addition, because the electrodes in the inorganic structure of the flip structure do not shield light emission, the blue light emitting unit 21 is arranged to adopt the flip structure, so that the light emitting efficiency of the blue light emitting unit 21 can be effectively improved.

Alternatively, the blue light emitting unit 21 includes a first electrode 31, an inorganic light emitting function layer 32, and a second electrode 33 with reference to fig. 1; the first electrode 31 and the second electrode 33 are used for providing a driving voltage to the inorganic light emitting functional layer 32, and the inorganic light emitting functional layer 32 emits blue light under the action of the driving voltage provided by the first electrode 31 and the second electrode 33.

In addition, the blue light emitting unit 21 adopts a flip-chip type inorganic light emitting diode structure; the first electrode 31 and the second electrode 33 are both disposed on the surface of the array substrate 10, and the inorganic luminescent functional layer 32 is disposed on a side of the first electrode 31 and the second electrode 33 away from the array substrate 10.

The light of the light emitting diode with the flip-chip structure is emitted from one side of the inorganic light emitting functional layer 32, which is far away from the array substrate 10, and the first electrode 31 and the second electrode 33 do not shield light, so that the light emitting efficiency can be improved; and the areas of the first electrode 31 and the second electrode 33 can be made large, which is beneficial to heat dissipation of the chip. And the first electrode 31 and the second electrode 33 can be arranged on the same layer, so that the size of the device can be reduced, and the cost can be saved. In addition, for the flip-chip type inorganic light emitting diode structure, a Thin Film Transistor (TFT) driving circuit (not shown) is disposed in the array substrate 10, an output terminal of the driving circuit is connected to the first electrode 31, a connection circuit connected to the second electrode 33 is further disposed in the array substrate 10, and the second electrode 33 is connected to an integrated circuit for providing a set voltage signal through the connection circuit, which may be, for example, an integrated circuit for providing a constant voltage signal to a cathode of the organic light emitting diode structure.

Fig. 2 is a schematic view of another display panel according to an embodiment of the present invention, and optionally, referring to fig. 2, the inorganic light emitting functional layer 32 includes a first inorganic layer 321, an inorganic light emitting layer 322, and a second inorganic layer 323 sequentially stacked, the first electrode 31 is connected to the first inorganic layer 321, and the second electrode 33 is connected to the second inorganic layer 323.

Specifically, under the driving voltage supplied from the first electrode 31 and the second electrode 33, the first inorganic layer 321 and the second inorganic layer 323 generate holes and electrons, and the holes and the electrons excite the inorganic light emitting layer 322 to emit blue light. The first electrode 31 may be an anode, the second electrode 33 may be a cathode, the first inorganic layer 321 may be a P-type gan material, and the second inorganic layer 323 may be an N-type gan material.

Fig. 1 and 2 show only an exemplary connection manner between the inorganic luminescent functional layer and the second electrode, and do not limit the present invention. Specifically, because a certain distance is formed between the second inorganic layer and the second electrode along a direction perpendicular to the array substrate, the second electrode may be manufactured to have a larger thickness to be connected to the second inorganic layer, and a conductive structure may also be manufactured on the second electrode, and the second electrode and the second inorganic layer are connected through the conductive structure, which is not limited in this embodiment. In addition, the blue light emitting unit adopting the flip-chip type inorganic light emitting diode structure may further include a sapphire substrate, the sapphire substrate is located on one side of the second inorganic layer far away from the inorganic light emitting layer, and since the inorganic light emitting functional layer is formed on the sapphire substrate and then disposed on the array substrate, the sapphire substrate may or may not be removed, and this embodiment is not particularly limited.

Fig. 3 is a schematic diagram of another display panel according to an embodiment of the present invention, and referring to fig. 3, alternatively, the blue light emitting unit 21 may also adopt a vertical inorganic light emitting diode structure; the first electrode 31, the inorganic luminescent functional layer 32 and the second electrode 33 are sequentially stacked, and the first electrode 31 is disposed on one side of the inorganic luminescent functional layer 32 adjacent to the array substrate 10.

The light of the vertical inorganic light emitting diode is emitted from one side of the second electrode 33, and the vertical inorganic light emitting diode is characterized in that the current path is short, and the current path of the vertical inorganic light emitting diode is not required to be bent like a plane and a diode with an inverted structure, so that the current crowding phenomenon does not exist, and the photoelectric efficiency is improved; and the first electrode 31 can be made into a whole surface, so that the heat dissipation area is increased, and the heat dissipation performance is better.

Alternatively, referring to fig. 3, the red light emitting unit 22 and the green light emitting unit 23 include a third electrode 41, an organic light emitting function layer 42, and a fourth electrode 43 sequentially stacked; the third electrode 41 is disposed on a side of the organic light emitting function layer 42 adjacent to the array substrate 10.

Wherein the third electrode 41 may be an anode, the fourth electrode 43 may be a cathode, and the organic light emitting functional layer 42 emits red or green light under the driving voltage provided by the third electrode 41 and the fourth electrode 43.

Alternatively, referring to fig. 3, the first electrode 31 and the third electrode 41 are disposed in the same layer, and the second electrode 33 and the fourth electrode 43 are disposed in the same layer. In this way, the first electrode 31 and the third electrode 41 can be fabricated in the same process, and the second electrode 33 and the fourth electrode 43 can be fabricated in the same process, which is beneficial to simplifying the fabrication process of the display panel and reducing the fabrication cost of the display panel.

Fig. 4 is a schematic diagram of another display panel according to an embodiment of the present invention, and optionally, referring to fig. 4, the first electrode 31 and the second electrode 33 are disposed in the same layer as the third electrode 41. In this way, the first electrode 31 and the second electrode 33 can be manufactured in the same process as the third electrode 41, thereby further simplifying the manufacturing process of the display panel and reducing the manufacturing cost of the display panel.

Alternatively, referring to fig. 4, the organic light emitting function layer 42 includes a hole injection layer 421, a hole transport layer 422, an organic light emitting layer 423, an electron transport layer 424, and an electron injection layer 425, which are sequentially stacked; the hole injection layer 421 is disposed on a side of the hole transport layer 422 adjacent to the third electrode 41.

Specifically, the organic light emitting function layer 42 may further include an electron blocking layer between the organic light emitting layer 423 and the hole transport layer 422, and a hole blocking layer between the organic light emitting layer 423 and the electron transport layer 424. The display panel may further include spacers 50 for defining the respective light emitting cells.

Fig. 5 is a schematic diagram of a display device according to an embodiment of the present invention, and referring to fig. 5, the display device 100 includes a display panel 200 according to any embodiment of the present invention. The display device 100 may be an electronic device such as a mobile phone and a tablet computer.

Fig. 6 is a flowchart of a method for manufacturing a display panel according to an embodiment of the present invention, and with reference to fig. 6, the method includes:

step 110, an array substrate is provided.

Step 120, arranging a plurality of light emitting units on the array substrate; the plurality of light emitting units comprise blue light emitting units, and the blue light emitting units adopt an inorganic light emitting diode structure; the light emitting unit further comprises a red light emitting unit and a green light emitting unit; the red light-emitting unit and the green light-emitting unit adopt an organic light-emitting diode structure; the blue light emitting unit is in a flip-chip structure.

The blue light-emitting unit of this embodiment adopts decay slow, longe-lived inorganic light-emitting diode structure, can show and slow down blue light-emitting unit decay, improves blue light-emitting unit life-span to improve whole display panel's life-span, prevent display panel colour cast, promote display panel's display effect. In addition, because the electrode can not shelter from in the inorganic structure of flip-chip structure and give out light, adopt the flip-chip structure through setting up blue luminescence unit, can effectively promote blue luminescence unit's luminous efficacy, further improve display panel's life-span.

Optionally, the disposing a plurality of light emitting units on the array substrate includes:

arranging a first electrode and a third electrode on the array substrate;

arranging an inorganic luminous functional layer on one side of the first electrode, which is far away from the array substrate;

an organic light-emitting functional layer is arranged on one side of the third electrode, which is far away from the array substrate;

a second electrode and a fourth electrode are respectively arranged on one sides of the inorganic light-emitting functional layer and the organic light-emitting functional layer, which are far away from the array substrate;

the first electrode and the third electrode are formed in the same process, and the second electrode and the fourth electrode are formed in the same process.

Specifically, a first electrode, an inorganic light emitting functional layer and a second electrode which are arranged in a stacked manner form a vertical inorganic light emitting diode structure, and a third electrode, an organic light emitting functional layer and a fourth electrode which are arranged in a stacked manner form an organic light emitting diode structure, wherein a blue light emitting unit adopts an inorganic light emitting diode structure, and red and green light emitting units adopt organic light emitting diode structures. When the inorganic light emitting diode structure with the vertical structure is manufactured, a finished light emitting function layer can be directly adopted, the light emitting function layer is arranged on the first electrode, the first inorganic layer of the light emitting function layer is in bonding connection with the first electrode, the second electrode is directly manufactured on the second inorganic layer of the inorganic light emitting function layer, and the second electrode is connected with the integrated circuit in a mode of connecting leads or bonding and the like.

Optionally, the disposing a plurality of light emitting units on the array substrate includes:

arranging a first electrode, a second electrode and a third electrode on an array substrate;

arranging an inorganic light-emitting functional layer on the first electrode and the second electrode far away from the array;

an organic light-emitting functional layer is arranged on the third electrode away from the array substrate;

a fourth electrode is arranged on one side of the organic light-emitting functional layer, which is far away from the array substrate;

and the first electrode, the second electrode and the third electrode are formed in the same process.

Specifically, the first electrode, the second electrode and the inorganic light-emitting functional layer form a flip-chip type inorganic light-emitting diode structure, when the inorganic light-emitting diode with the flip-chip structure is manufactured, the finished inorganic light-emitting functional layer can be directly arranged on the surfaces of the first electrode and the second electrode, the first electrode is in bonding connection with the first inorganic layer of the inorganic light-emitting functional layer, and the second electrode is in bonding connection with the second inorganic layer of the inorganic light-emitting functional layer.

Optionally, an organic light emitting function layer is disposed on a side of the third electrode away from the array substrate, and the organic light emitting function layer includes:

and sequentially evaporating a hole injection layer, a hole transport layer, an organic light emitting layer, an electron transport layer and an electron injection layer on the surface of the third electrode.

Fig. 7 is a flowchart of a method for manufacturing a display panel according to another embodiment of the present invention, where the present embodiment provides a specific example based on the foregoing embodiment, and referring to fig. 7, the method includes:

step 210, a TFT driving circuit is fabricated on the glass substrate, wherein a cathode connection circuit is also fabricated in the blue light emitting unit region.

The cathode connecting circuit made in the blue light-emitting unit area is used for connecting the cathode of the blue light-emitting unit and the integrated circuit for providing a set voltage signal for the cathode.

Step 220, manufacturing an isolation column on the TFT driving circuit, manufacturing anodes in the red light emitting unit area and the green light emitting unit area, and manufacturing an anode and a cathode in the blue light emitting unit area.

The anode of each light-emitting unit is electrically connected with the output end of the corresponding TFT drive circuit, and the cathode of the blue light-emitting unit is connected with the cathode connecting circuit.

And step 230, bonding the blue LED chip with the flip structure on the cathode and the anode of the blue light-emitting unit area.

The blue LED chip can be an inorganic light emitting function layer of a blue inorganic light emitting diode structure.

Step 240, evaporating a hole injection layer and a hole transport layer in the red light emitting unit and the green light emitting unit areas.

Step 250, using a Fine Metal Mask (FMM) as a barrier layer, respectively evaporating the red and green organic light emitting layers.

And step 260, evaporating an electron transport layer and an electron injection layer in the red light-emitting unit region and the green light-emitting unit region.

And 270, evaporating transparent cathodes in the red light-emitting unit and the green light-emitting unit areas.

Step 280, packaging the device.

Specifically, a cover plate package may be used, or a film package may be used.

Fig. 8 is a flowchart of a method for manufacturing a display panel according to another embodiment of the present invention, where the present embodiment provides a specific example based on the foregoing embodiment, and referring to fig. 8, the method includes:

step 310, manufacturing a TFT driving circuit on the glass substrate.

And step 320, manufacturing an isolation column and an anode on the TFT driving circuit.

And step 330, bonding the blue LED chip with the vertical structure on the blue light emitting unit anode.

And 340, evaporating a hole injection layer and a hole transport layer in the red light-emitting unit and the green light-emitting unit areas.

And step 350, respectively evaporating the red organic light-emitting layer and the green organic light-emitting layer by using FMM as a blocking layer.

And 360, evaporating an electron transport layer and an electron injection layer in the red light-emitting unit and the green light-emitting unit areas.

Step 370, evaporating the common transparent cathode.

Wherein the common transparent cathode is shared by the red light emitting unit, the green light emitting unit and the blue light emitting unit, and cathode driving signals are supplied to the red light emitting unit, the green light emitting unit and the blue light emitting unit by inputting a set voltage signal to the common transparent cathode.

And 380, packaging the device.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.