CN-122003000-A - Display device

Abstract

According to one aspect of the present disclosure, a display device includes a first substrate, a planarization layer disposed on the first substrate and including a first top surface, a second top surface having a height lower than the first top surface, and an inclined surface, a first reflective electrode at least partially disposed on the inclined surface of the planarization layer, a light emitting element on the first reflective electrode, and a second reflective electrode disposed to cover the light emitting element. The light emitting element is disposed on either one of the first top surface and the second top surface. Accordingly, the first reflective electrode is disposed on the inclined surface to more easily extract light emitted from the light emitting element to the outside.

Inventors

• JIANG DAYI
• JIN SHENGWU

Assignees

• 乐金显示有限公司

Dates

Publication Date

20260508

Application Date

20250829

Priority Date

20241108

Claims (18)

1. 1. A display device, comprising: a first substrate; a planarization layer disposed on the first substrate and including a first top surface, a second top surface having a height lower than that of the first top surface, and an inclined surface; a first reflective electrode at least partially disposed on the inclined surface of the planarization layer; A light emitting element on the first reflective electrode, and A second reflective electrode provided so as to cover the light emitting element; wherein the light emitting element is disposed on any one of the first top surface and the second top surface.
2. 2. The display device according to claim 1, further comprising: a light conversion layer provided on the first reflective electrode and surrounding the light emitting element; Wherein the second reflective electrode covers a portion of the light conversion layer.
3. 3. The display device according to claim 2, further comprising: a bank disposed on the planarization layer and surrounding the light emitting element and the light conversion layer; Wherein at least a portion of the area in the bank overlaps the inclined surface.
4. 4. A display device according to claim 3, wherein the light emitting element is provided on the first top surface in the region in the bank, and a part of the light conversion layer overlaps the inclined surface and another part of the light conversion layer overlaps the first top surface.
5. 5. The display device according to claim 4, wherein the second reflective electrode extends from a region on the first top surface toward a region on the inclined surface to cover the light emitting element, and wherein a portion of the light conversion layer provided on the inclined surface is exposed from the second reflective electrode.
6. 6. The display device according to claim 4, wherein the thickness of the light conversion layer is larger as the distance from the light emitting element is larger.
7. 7. A display device according to claim 3, wherein the dike comprises: A first bank disposed on the planarization layer, and And a second bank disposed on the first bank.
8. 8. The display device according to claim 7, wherein the first bank is provided on the first top surface and the second top surface, and a thickness of a portion of the first bank provided on the second top surface is greater than a thickness of another portion of the first bank provided on the first top surface.
9. 9. The display device according to claim 7, wherein the first reflective electrode is in contact with a top surface and a side surface of the first bank, and the first reflective electrode is disposed between the first bank and the second bank.
10. 10. A display device according to claim 3, wherein the light emitting element is provided on the second top surface, and a part of the light conversion layer overlaps the second top surface and another part of the light conversion layer overlaps the inclined surface.
11. 11. The display device according to claim 4, further comprising: And a black matrix provided in the remaining region except for the region where the light conversion layer is provided.
12. 12. The display device according to claim 10, wherein the second reflective electrode comprises: a reflective layer provided on the light emitting element and provided in a part of the second reflective electrode, and And a transparent layer disposed on the reflective layer and disposed throughout the second reflective electrode.
13. 13. The display device according to claim 12, wherein the reflective layer of the second reflective electrode extends from a region on the second top surface toward a region on the inclined surface to cover the light emitting element, and wherein a portion of the light conversion layer provided on the inclined surface is exposed from the reflective layer of the second reflective electrode.
14. 14. The display device according to claim 13, wherein a portion of the light conversion layer exposed from the reflection layer is an edge portion of the light conversion layer.
15. 15. The display device according to claim 12, wherein a cross-sectional shape of the reflective layer is a step shape.
16. 16. The display device according to claim 12, wherein the reflective layer is formed in a stepped structure widened upward.
17. 17. The display device according to claim 12, further comprising: a black matrix disposed on the second reflective electrode to overlap the reflective layer; Wherein the black matrix is disposed to be spaced apart from a portion of the light conversion layer exposed from the reflective layer.
18. 18. The display device according to any one of claims 1 to 17, further comprising: a plurality of irregular patterns disposed between the inclined surface of the planarization layer and the first reflective electrode, Wherein the portion of the first reflective electrode disposed on the inclined surface has a surface along the shape of the plurality of irregular patterns.

Description

Display device Cross Reference to Related Applications The present application claims priority from korean patent application No. 10-2024-0157746 filed on 8 th 11 of 2024 to the korean intellectual property office, the disclosure of which is incorporated herein by reference. Technical Field The present disclosure relates to display devices, and more particularly, to display devices using light emitting elements (LEDs). Background As display devices for monitors of computers, televisions, or cellular phones, there are organic light emitting display devices (OLEDs) as self-luminous devices and liquid crystal display devices (LCDs) requiring a separate light source. The application range of display devices is diversified to personal digital assistants and monitors and televisions of computers, and display devices having a large display area and reduced volume and weight are being studied. Further, in recent years, a display device including an LED has been attracting attention as a next-generation display device. Since the LED is formed of an inorganic material instead of an organic material, reliability is excellent such that its lifetime is longer than that of a liquid crystal display device or an organic light emitting display device. Further, the LED has a fast lighting speed, excellent light emitting efficiency, and strong impact resistance, so that stability is excellent, and an image having high brightness can be displayed. Disclosure of Invention An object to be achieved by the present disclosure is to provide a display device including an inorganic light emitting element having excellent light emitting efficiency which is driven at low power. Another object to be achieved by the present disclosure is to provide a display device having improved light conversion efficiency and improved light extraction efficiency. It is still another object of the present disclosure to provide a display device in which the thickness of a light conversion layer is easily controlled. It is still another object of the present disclosure to provide a display device that improves light extraction efficiency by forming an irregular structure in a region where light emitted from a light emitting element is released. The objects of the present disclosure are not limited to the above-mentioned objects, and other objects not mentioned above will be clearly understood by those skilled in the art from the following description. According to one aspect of the present disclosure, a display device includes a first substrate, a planarization layer disposed on the first substrate and including a first top surface, a second top surface having a height lower than that of the first top surface, and an inclined surface, a first reflective electrode at least partially disposed on the inclined surface of the planarization layer, a light emitting element on the first reflective electrode, and a second reflective electrode disposed to cover the light emitting element. The light emitting element is disposed on either one of the first top surface and the second top surface. Accordingly, the first reflective electrode is disposed on the inclined surface to more easily extract light emitted from the light emitting element to the outside. Other details of the exemplary embodiments are included in the detailed description and the accompanying drawings. According to the present disclosure, a high-resolution display device including an inorganic light emitting element having excellent light emission efficiency to display an image at low power with high efficiency and high luminance can be realized. According to the present disclosure, reflective electrodes are formed above and below the light emitting element and the light conversion layer to improve light conversion efficiency and light extraction efficiency. According to the present disclosure, an inclined surface is formed in a region in which the light conversion layer is disposed to easily control the thickness of the light conversion layer. According to the present disclosure, an irregular structure is formed in a region where light is released to improve light extraction efficiency. Effects according to the present disclosure are not limited to the above-exemplified ones, and more various effects are included in the present specification. Drawings The above and other aspects, features and advantages of the present disclosure will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings in which: FIG. 1 is a schematic diagram of a display device according to an exemplary embodiment of the present disclosure; fig. 2A is a partial cross-sectional view of a display device according to an exemplary embodiment of the present disclosure; fig. 2B is a perspective view of a tiled (tiling) display device, according to an example embodiment of the present disclosure; fig. 3 is an enlarged plan view of a display device according to an exemplary e