Light emitting device and display
阅读说明:本技术 发光装置和显示器 (Light emitting device and display ) 是由 片冈祐亮 大桥达男 琵琶刚志 大前晓 于 2018-04-26 设计创作,主要内容包括:一种发光装置,该发光装置包括:发光层,该发光层设置在第一面与第二面之间;第一电极,该第一电极设置在第一面上并且电耦合至发光层;第二电极,该第二电极设置在第二面上并且电耦合至发光层;以及非选择电极,该非选择电极设置在第一面上并且处于未电耦合至电位供应源的状态中。(A light emitting device, comprising: a light emitting layer disposed between the first face and the second face; a first electrode disposed on the first face and electrically coupled to the light emitting layer; a second electrode disposed on the second face and electrically coupled to the light emitting layer; and a non-selection electrode provided on the first face and in a state of not being electrically coupled to the potential supply source.)
1. A light emitting device, comprising:
a light emitting layer disposed between the first face and the second face;
a first electrode disposed on the first face and electrically coupled to the light emitting layer;
a second electrode disposed on the second face and electrically coupled to the light emitting layer; and
a non-selection electrode disposed on the first face and in a state of not being electrically coupled to a potential supply source.
2. The light-emitting device according to claim 1, wherein the first electrode and the non-selection electrode are different from each other in electrode area.
3. The light-emitting device according to claim 1, wherein the first electrode and the non-selection electrode are different from each other in a planar shape.
4. The light-emitting device according to claim 1, wherein the first electrode and the non-selective electrode are different from each other in constituent material.
5. The light emitting device of claim 1, further comprising:
a first semiconductor layer between the first electrode and the light emitting layer; and
a second semiconductor layer between the second electrode and the light emitting layer.
6. The light-emitting device according to claim 5, wherein the first electrode and the non-selection electrode are provided in respective regions of the first face that are different from each other.
7. The light-emitting device according to claim 6, wherein a portion overlapping with the first electrode and a portion overlapping with the non-selection electrode are electrically isolated in the light-emitting layer and the first semiconductor layer.
8. The light-emitting device according to claim 1, wherein the first electrode and the non-selection electrode have respective rotationally symmetrical shapes in a plan view.
9. The light-emitting device according to claim 1, wherein a planar shape of one of the first electrode and the non-selection electrode is a quadrangle.
10. The light-emitting device according to claim 9, wherein the other of the first electrode and the non-selection electrode surrounds the quadrangle.
11. The light-emitting device according to claim 1, wherein a planar shape of one of the first electrode and the non-selection electrode is a circular shape.
12. The light emitting device of claim 1, wherein the light emitting layer comprises InGaN.
13. The light emitting device of claim 1, further comprising: a switching device coupled to the first electrode and the non-select electrode,
wherein the switching device is operable to supply an electrical potential to the first electrode.
14. The light-emitting device according to claim 1, wherein the first electrode, the non-selective electrode, or both comprise a plurality of conductive films.
15. A display includes a display panel including a mounting substrate, and a plurality of light emitting devices disposed on the mounting substrate,
the light emitting devices respectively include:
a light emitting layer disposed between the first face and the second face,
a first electrode disposed on the first face and electrically coupled to the light emitting layer,
a second electrode disposed on the second face and electrically coupled to the light emitting layer, an
A non-selection electrode disposed on the first face and in a state of not being electrically coupled to a potential supply source.
16. The display of claim 15, wherein all of the light emitting devices disposed on the mounting substrate include the same shape of the first electrode.
17. The display of claim 15, wherein all of the light emitting devices disposed on the mounting substrate comprise the first electrode comprising the same constituent material.
18. The display of claim 15, wherein a portion of the plurality of light emitting devices disposed on the mounting substrate have a shape of the first electrode different from a shape of the first electrode of another light emitting device.
19. The display of claim 15, wherein the plurality of display panels are placed closely together in a tile pattern.
Technical Field
The present technology relates to a light-emitting device and a display, which are suitable for, for example, a tiled display or the like.
Background
Self-luminous display panels using light emitting devices such as Light Emitting Diodes (LEDs) have been developed (see, for example, patent document 1). It has been proposed to couple a plurality of such self-luminous display panels to provide a tiled display (display).
Reference list
Patent document
Patent document 1: japanese unexamined patent application publication No. 2015-92529
Disclosure of Invention
Such displays are expected to improve image quality.
Therefore, it is desirable to provide a light emitting device and a display capable of improving image quality.
A light emitting device according to an embodiment of the present technology includes: a light emitting layer disposed between the first face and the second face; a first electrode disposed on the first face and electrically coupled to the light emitting layer; a second electrode disposed on the second face and electrically coupled to the light emitting layer; and a non-selection electrode provided on the first face and in a state of not being electrically coupled to the potential supply source.
A display according to one embodiment of the present technology includes a light emitting device according to one embodiment of the present technology.
A light-emitting device and a display according to one embodiment of the present technology each include a plurality of electrically isolated conductive films provided on a first face, and a conductive film (first electrode) to which a potential is supplied is selected in accordance with a state of a light-emitting layer. The conductive film to which no potential is supplied among the plurality of conductive films is a non-selective electrode.
A light-emitting device and a display according to one embodiment of the present technology select a first electrode according to a state of a light-emitting layer, and thus can adjust a wavelength of light emitted from the light-emitting device. This makes it possible to suppress variations between wavelengths of light emitted from the plurality of light emitting devices and improve image quality. It is worth noting that the effects described herein are not necessarily limited, and may be any of the effects described in this disclosure that may be provided.
Drawings
Fig. 1 is an exploded perspective view illustrating a schematic configuration of a display according to an embodiment of the present technology.
Fig. 2 is a perspective view illustrating a schematic configuration of a substrate of the device shown in fig. 1.
Fig. 3 is a perspective view illustrating a schematic configuration of the unit shown in fig. 2.
Fig. 4 is a cross-sectional view illustrating a schematic configuration of the unit shown in fig. 3.
Fig. 5A is a plan view schematically (1) illustrating a schematic configuration of the display panel shown in fig. 3.
Fig. 5B is a plan view schematically (2) illustrating a schematic configuration of the display panel shown in fig. 3.
Fig. 6A is a schematic sectional view illustrating a common configuration between the light emitting devices shown in fig. 5A and 5B.
Fig. 6B is a schematic plan view of a first face of the light emitting device shown in fig. 6A.
Fig. 6C is a schematic plan view of the second face of the light emitting device shown in fig. 6A.
Fig. 7A is a schematic sectional view illustrating the configuration of the light emitting device shown in fig. 5A.
Fig. 7B is a schematic plan view of a first face of the light emitting device shown in fig. 7A.
Fig. 8A is a schematic sectional view illustrating the configuration of the light emitting device shown in fig. 6A.
Fig. 8B is a schematic plan view of a first face of the light emitting device shown in fig. 8A.
Fig. 9 is a perspective view illustrating a schematic configuration of a unit according to a comparative example.
Fig. 10A is a schematic sectional view illustrating a configuration of a light emitting device of the display panel shown in fig. 9.
Fig. 10B is a schematic plan view illustrating a first face of the light emitting device shown in fig. 10A.
Fig. 11 is a schematic plan view illustrating one example of a display state of the unit shown in fig. 9.
Fig. 12 is a schematic plan view illustrating another example of the light emitting device shown in fig. 5A and 5B.
Fig. 13 is a diagram for explaining the wavelength of light emitted by the light emitting device shown in each of fig. 7B, 8B, and 12.
Fig. 14 is a diagram illustrating an example of the relationship between the number of manufactured light emitting devices and the emission wavelength of the manufactured light emitting devices.
Fig. 15A is a schematic sectional view illustrating a configuration of a light emitting device according to modified example 1.
Fig. 15B is a schematic plan view of a first face of the light-emitting device shown in fig. 15A.
Fig. 16A is a schematic sectional view illustrating a configuration of a light emitting device according to modified example 2.
Fig. 16B is a schematic plan view of a first face of the light-emitting device shown in fig. 16A.
Fig. 17A is a schematic sectional view illustrating a configuration of a light emitting device according to modified example 3.
Fig. 17B is a schematic plan view of a first face of the light-emitting device shown in fig. 17A.
Fig. 18 is a schematic plan view illustrating another example of the configuration of the light emitting device shown in fig. 17B.
Fig. 19 is a schematic plan view illustrating a configuration of a light emitting device according to a modified example 4.
Fig. 20 is a schematic plan view illustrating a configuration of a display panel according to a modified example 5.
Fig. 21 is a diagram illustrating a configuration of an electronic apparatus (television apparatus) according to an application example.
Fig. 22 is a schematic plan view illustrating another example (1) of the configuration of the light-emitting device shown in fig. 6B.
Fig. 23 is a schematic plan view illustrating another example (2) of the configuration of the light-emitting device shown in fig. 6B.
Detailed Description
Embodiments of the present technology will be described in detail below with reference to the accompanying drawings. In this regard, the embodiments will be described in the following order.
1. Example (display including light emitting device including non-selection electrode)
2. Modified example 1 (example of light emitting device coupled to switching device)
3. Modified example 2 (example of light-emitting device with groove)
4. Modified example 3 (example of light-emitting device in which first electrode or non-selective electrode includes a plurality of conductive films)
5. Modified example 4 (example of light-emitting device in which planar shape of first electrode or non-selective electrode is circular)
6. Modified example 5 (example of display panel including light-emitting device in which conductive film a is used as a first electrode and light-emitting device in which conductive film B is used as a first electrode)
< example >
Fig. 1 schematically illustrates an overall configuration of a display (display 1) according to an embodiment of the present technology. The
Fig. 2 schematically illustrates one example of the configuration of the
Fig. 3 schematically illustrates one example of the configuration of the unit U. The unit U includes, for example, a plurality of display panels (
Fig. 4 schematically illustrates one example of a configuration between the
Fig. 5A illustrates a schematic planar configuration of the
Fig. 6A to 6C schematically illustrate a common configuration between the light-emitting
The conductive film a121A and the conductive film B121B are provided in regions of the first face S1 that are different from each other, and are electrically isolated. The conductive film a121A and the conductive film B121B differ in one or more of shape (including size), electrode area, constituent material, and the like. The current density of the current flowing through the conductive film a121A is different from the current density of the current flowing through the conductive film B121B. The conductive film a121A and the conductive film B121B preferably have a planar shape with rotational symmetry. The center of symmetry is preferably located at the center of the first face S1. This enables to improve light distribution characteristics. The conductive film a121A is provided, for example, in the middle of the first face S1. The planar shape of the conductive film a121A is a square (fig. 6B). The planar shape of the conductive film B121B is, for example, a frame-like square surrounding the periphery of the conductive film a 121A. That is, for example, the conductive film a121A and the conductive film B121B have a four-fold symmetrical planar shape. The conductive film a121A and the conductive film B121B may have a quadrangular planar shape such as a rectangle. For example, the electrode area of the conductive film B121B is larger than that of the conductive film a 121A. The current density of the current flowing through the conductive film B121B is smaller than that of the current flowing through the conductive film a 121A.
Fig. 7A and 7B schematically illustrate the configuration of the light-emitting
As described in detail below, according to the present embodiment, a plurality of electrically isolated conductive films (the conductive film a121A and the conductive film B121B) are provided on the first face S1 in this manner. This enables selection of the conductive film to be used as the first electrode. This enables adjustment of the wavelength of the light (light LA and light LB) generated in the
As an example, fig. 3 illustrates a case where one unit U includes the
The conductive film a121A and the conductive film B121B are provided in contact with the
The
The
The
The
In the case where a predetermined voltage is applied between the conductive film a121A or the conductive film B121B and the
Fig. 9 illustrates a schematic configuration of a unit (unit U100) according to a comparative example. The unit U100 includes a plurality of display panels (display panels 100) closely placed in a tile pattern. The same configuration is adopted for all the
Fig. 10A and 10B schematically illustrate the configuration of a light-emitting device (light-emitting device 120) included in the
Fig. 11 schematically illustrates a display state of the unit U100. In the case where one of the
A method of selecting and using the
In contrast to this, the
As shown in fig. 12, the
Fig. 13 illustrates a relationship between the current density and the dominant wavelength of the light-emitting
Further, by adjusting the wavelengths of the light LA and the light LB, the number of the light-emitting
Fig. 14 illustrates a relationship between the wavelength of light emitted from the manufactured light emitting devices and the number of the manufactured light emitting devices. As described above, using a light-emitting device whose emission wavelength range after manufacture is a range RS on the shorter wavelength side than the acceptable range R and a light-emitting device whose emission wavelength range after manufacture is a range RL on the longer wavelength side than the acceptable range R greatly reduces the image quality. Further, in the case where only the light emitting device within the acceptable range R is selected, the number of processes increases, and the cost increases. In contrast, by selecting which of the conductive film a121A and the conductive film B121B is used as the first electrode, the emission wavelength of the light-emitting device in the range RS and the range RL can be made to fall within the acceptable range R. Therefore, the
As described above, according to the present embodiment, the first electrode is selected from the conductive film a121A and the conductive film B121B according to the state of the light-emitting
Further, the conductive film a121A and the conductive film B121B have rotationally symmetric planar shapes. This enables to improve light distribution characteristics.
Further, the same conductive film a121A (or conductive film B121B) in all the light emitting
Modified examples of the above-described embodiments will be described below, and in the following description, the same components as those in the above-described embodiments will be assigned the same reference numerals, and descriptions thereof will be omitted as appropriate.
< modified example 1>
Fig. 15A and 15B schematically illustrate the configuration of light emitting
fig. 15B illustrates a planar configuration of the
The
< modified example 2>
Fig. 16A and 16B schematically illustrate the configuration of light emitting
fig. 16B illustrates a planar configuration of the light-emitting
The
Current is injected from the conductive film a121A to the light-emitting
As in the present modified example, the semiconductor layer may be electrically isolated at a portion overlapping with the conductive film a121A and a portion overlapping with the conductive film B121B in a plan view. In this case, the same effects as those of the above-described embodiment can be obtained. Further, it is possible to suppress diffusion of current from the conductive film a121A and the conductive film B121B to the light-emitting
< modified example 3>
Fig. 17A and 17B schematically illustrate the configuration of a light-emitting
The light-emitting
The
In addition to the
Fig. 18 illustrates one example of a schematic planar configuration of the light-emitting
As in the present modified example, the first face S1 of the
< modified example 4>
Fig. 19 schematically illustrates a planar configuration of a light-emitting
The conductive film a121A is provided, for example, in the middle of the first face S1. The planar shape of the conductive film a121A is circular. The planar shape of the conductive film B121B is, for example, a frame-like circle surrounding the periphery of the conductive film a 121A. The centers of the conductive film a121A and the conductive film B121B are disposed, for example, at the center of the first face S1 in plan view. That is, the conductive film a121A and the conductive film B121B have high symmetry. This enables higher light distribution characteristics to be obtained. For example, the electrode area of the conductive film B121B is larger than that of the conductive film a 121A. The current density of the current flowing through the conductive film B121B is smaller than that of the current flowing through the conductive film a 121A.
As in the present modified example, the planar shapes of the conductive film a121A and the conductive film B121B may be circular. In this case, the same effects as those of the above-described embodiment can be obtained. Further, by enhancing the symmetry of the planar shapes of the conductive film a121A and the conductive film B121B, the light distribution characteristics can be further enhanced.
< modified example 5>
Fig. 20 schematically illustrates a planar configuration of a display panel (
< application example >
The
Fig. 21 illustrates the appearance of a television apparatus to which the
The present technology has been described above with reference to the embodiment and the modified examples. However, the present technology is not limited to the embodiments and the like, and various modifications can be made. For example, the material and thickness of each portion described in the above-described embodiments and the like are not limited thereto, and may be other materials and other thicknesses.
Further, the arrangement of the conductive film a121A and the conductive film B121B on the first face S1 is not limited to the arrangement illustrated in fig. 6B and other drawings. For example, as shown in fig. 22, each side of the first face S1 and each vertex of the conductive film a121A and the conductive film B121B may be opposed in a plan view.
Further, the planar shape of the conductive film B121B may not be a frame shape. For example, as shown in fig. 23, the conductive film a121A may be provided between a plurality of conductive films B121B (two conductive films B121B in fig. 23).
Further, the
Further, the
It is to be noted that the effects disclosed in the present specification are merely examples and are not restrictive, and further, other effects may be provided.
Note that the present technology can also adopt the following configuration.
(1)
A light emitting device, comprising:
a light emitting layer disposed between the first face and the second face;
a first electrode disposed on the first face and electrically coupled to the light emitting layer;
a second electrode disposed on the second face and electrically coupled to the light emitting layer; and
a non-selection electrode disposed on the first face and in a state of not being electrically coupled to the potential supply source.
(2)
The light-emitting device according to (1), wherein the first electrode and the non-selection electrode are different from each other in electrode area.
(3)
The light-emitting device according to (1), wherein the first electrode and the non-selection electrode are different from each other in planar shape.
(4)
The light-emitting device according to (1), wherein the first electrode and the non-selective electrode are different from each other in constituent material.
(5)
The light-emitting device according to any one of (1) to (4), further comprising:
a first semiconductor layer between the first electrode and the light emitting layer; and
a second semiconductor layer between the second electrode and the light emitting layer.
(6)
The light-emitting device according to (5), wherein the first electrode and the non-selection electrode are provided in respective regions of the first face that are different from each other.
(7)
The light-emitting device according to (6), wherein in the light-emitting layer and the first semiconductor layer, a portion overlapping with the first electrode and a portion overlapping with the non-selection electrode are electrically isolated.
(8)
The light-emitting device according to any one of (1) to (7), wherein the first electrode and the non-selection electrode have respective rotationally symmetrical shapes in a plan view.
(9)
The light-emitting device according to any one of (1) to (8), wherein a planar shape of one of the first electrode and the non-selection electrode is a quadrangle.
(10)
The light-emitting device according to (9), wherein the other of the first electrode and the non-selection electrode surrounds a quadrangle.
(11)
The light-emitting device according to any one of (1) to (8), wherein a planar shape of one of the first electrode and the non-selection electrode is a circular shape.
(12)
The light-emitting device according to any one of (1) to (11), wherein the light-emitting layer comprises InGaN.
(13)
The light-emitting device according to any one of (1) to (12), further comprising: a switching device coupled to the first electrode and the non-select electrode,
wherein the switching means is operable to supply an electrical potential to the first electrode.
(14)
The light-emitting device according to any one of (1) to (13), wherein the first electrode, the non-selective electrode, or both include a plurality of conductive films.
(15)
A display includes a display panel including a mounting substrate, and a plurality of light emitting devices disposed on the mounting substrate,
the light emitting devices respectively include:
a light emitting layer disposed between the first face and the second face,
a first electrode disposed on the first face and electrically coupled to the light emitting layer,
a second electrode disposed on the second face and electrically coupled to the light-emitting layer, an
A non-selection electrode disposed on the first face and in a state of not being electrically coupled to the potential supply source.
(16)
The display according to (15), wherein all of the light emitting devices provided on the mounting substrate include the same shaped first electrode.
(17)
The display according to (15), wherein all of the light emitting devices provided on the mounting substrate include the first electrode including the same constituent material.
(18)
The display according to (15), wherein a part of the plurality of light emitting devices provided on the mounting substrate has a shape of the first electrode different from a shape of the first electrode of another light emitting device.
(19)
The display according to any one of (15) to (18), wherein the plurality of display panels are closely placed in a tile pattern.
This application is based on and claims priority from japanese patent application No. 2017-111525 filed by 6/2017 at the japan patent office, the entire contents of which are incorporated herein by reference.
It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and alterations may occur depending on design requirements and other factors insofar as they come within the scope of the appended claims or the equivalents thereof.
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