CN-122003026-A - Display device, display system, and method of manufacturing display device

Abstract

A display device, a method of manufacturing the display device, and a display system are disclosed. The display device includes a substrate on which first to third sub-pixels are defined, a plurality of sidewalls disposed on the substrate, an anode electrode disposed on the substrate to correspond to the first to third sub-pixels, a first emission structure disposed on the anode electrode of the first sub-pixel, a second emission structure disposed on the anode electrode of the second sub-pixel, a third emission structure disposed on the anode electrode of the third sub-pixel, a cathode electrode disposed on the first, second and third emission structures, and a capping layer disposed on the cathode electrode. Each of the plurality of sidewalls includes a first sidewall and a second sidewall disposed on the first sidewall and having a width greater than a width of the first sidewall. The capping layer does not overlap at least one of the first to third emission structures in a plan view.

Inventors

• Pu Ximin
• Jin Arong
• JIN ZAIYI
• Wen Yingmin
• LIANG XI
• LI SIMIN
• ZHAO YUANJI

Assignees

• 三星显示有限公司

Dates

Publication Date

20260508

Application Date

20250916

Priority Date

20241101

Claims (20)

1. 1. A display device, wherein the display device comprises: A substrate on which the first, second and third sub-pixels are defined; A plurality of sidewalls disposed on the substrate; an anode electrode disposed on the substrate to correspond to each of the first, second, and third sub-pixels; a first emission structure disposed on the anode electrode of the first subpixel; a second emission structure disposed on the anode electrode of the second subpixel; a third emission structure disposed on the anode electrode of the third sub-pixel, and A cathode electrode disposed on each of the first, second and third emission structures, Wherein each of the plurality of side walls comprises: a first side wall, and And a second sidewall disposed on the first sidewall and having a width greater than a width of the first sidewall.
2. 2. The display device according to claim 1, wherein the display device further comprises: A capping layer disposed on the cathode electrode, and A pixel defining layer disposed under the plurality of sidewalls, Wherein the capping layer does not overlap at least one selected from the first emission structure, the second emission structure, and the third emission structure in a plan view, Wherein the pixel defining layer exposes at least a portion of the anode electrode, and Wherein the plurality of sidewalls are located in regions between the first, second and third emission structures, respectively.
3. 3. The display device according to claim 1, wherein the display device further comprises: a capping layer disposed on the cathode electrode, Wherein the capping layer does not overlap at least one selected from the first emission structure, the second emission structure, and the third emission structure in a plan view, and Wherein the anode electrode is disposed on the plurality of side walls.
4. 4. A display device according to claim 3, wherein the display device further comprises: A pixel defining layer surrounding a side surface of the anode electrode, Wherein the pixel defining layer is disposed on the second sidewall, and Wherein the anode electrode has a surface area smaller than a surface area of the second side wall in the plan view.
5. 5. A display device according to claim 3, Wherein the cathode electrode includes: A first cathode electrode contacting the first, second and third emission structures, and And a second cathode electrode disposed on the first cathode electrode.
6. 6. The display device according to claim 5, Wherein the second cathode electrode comprises a transparent conductive oxide, and Wherein the second cathode electrode surrounds the second sidewall.
7. 7. The display device according to claim 5, Wherein the capping layer has a first transmittance and a first refractive index with respect to light in the visible light range, Wherein the second cathode electrode has a second transmittance and a second refractive index with respect to the light in the visible light range, Wherein the first transmittance is in the range of 0.9 to 1.1 times the second transmittance, and Wherein the first refractive index is in the range of 0.9 to 1.1 times the second refractive index.
8. 8. The display device according to claim 5, Wherein the capping layer does not overlap one of the first, second, and third emission structures in the plan view, and the capping layer overlaps the remaining two of the first, second, and third emission structures in the plan view.
9. 9. The display device according to claim 5, Wherein the capping layer does not overlap with two of the first, second, and third emission structures in the plan view, and the capping layer overlaps with the remaining one of the first, second, and third emission structures in the plan view.
10. 10. A display device according to claim 3, wherein the display device further comprises: the packaging layer is arranged on the sealing layer, Wherein the capping layer contacts the encapsulation layer.
11. 11. A display device according to claim 3, Wherein the first sub-pixel provides light in a wavelength range of 600nm to 750nm, Wherein the second sub-pixel provides light in a wavelength range of 480nm to 560nm, Wherein the third sub-pixel provides light in a wavelength range of 370nm to 460nm, Wherein, in the plan view, the capping layer overlaps the first and second emission structures and does not overlap the third emission structure, and Wherein each of the first, second and third emissive structures comprises an organic emissive material.
12. 12. The display device according to claim 1, Wherein the cathode electrode includes: A first cathode electrode contacting the first, second and third emission structures, and A second cathode electrode disposed on the first cathode electrode, and Wherein portions of the second cathode electrode overlapping the first, second, and third emission structures, respectively, have different thicknesses from each other.
13. 13. The display device according to claim 12, wherein the display device further comprises: an encapsulation layer disposed on the second cathode electrode, Wherein the second cathode electrode contacts the encapsulation layer.
14. 14. The display device of claim 13, wherein the display device further comprises a pixel defining layer disposed under the plurality of sidewalls, Wherein the pixel defining layer exposes at least a portion of the anode electrode, and Wherein the plurality of sidewalls are located in regions between the first, second and third emission structures, respectively.
15. 15. The display device according to claim 13, wherein the display device further comprises: A pixel defining layer surrounding a side surface of the anode electrode, Wherein the anode electrode and the pixel defining layer are disposed on the second sidewall, an Wherein the anode electrode has a surface area smaller than that of the second side wall in a plan view.
16. 16. A method of manufacturing a display device, wherein the method comprises: Forming a plurality of sidewalls on a substrate, a first sub-pixel region, a second sub-pixel region, and a third sub-pixel region being defined on the substrate; forming a first light emitting element on the substrate in the first sub-pixel region; forming a second light emitting element on the substrate in the second sub-pixel region; Forming a third light emitting element on the substrate in the third sub-pixel region, and Forming a capping layer on at least one selected from the first light emitting element, the second light emitting element and the third light emitting element, Wherein the forming the first light emitting element includes forming a first light emitting structure, Wherein the forming the second light emitting element includes forming a second emission structure, Wherein the forming the third light emitting element includes forming a third emission structure, Wherein the first, second and third emission structures are formed by different processes, Wherein each of the plurality of side walls comprises: a first side wall, and A second side wall provided on the first side wall and having a width larger than that of the first side wall, and Wherein the capping layer overlaps with the at least one selected from the first light emitting element, the second light emitting element, and the third light emitting element in a plan view.
17. 17. The method according to claim 16, Wherein each of the forming the first light emitting element, the forming the second light emitting element, and the forming the third light emitting element includes forming a cathode electrode, Wherein the cathode electrode includes: A first cathode electrode contacting the first, second and third emission structures, and A second cathode electrode disposed on the first cathode electrode, and Wherein, in the plan view, the capping layer overlaps one or both of the first emission structure, the second emission structure, and the third emission structure.
18. 18. The method of claim 17, wherein the method further comprises: An anode electrode is formed on the substrate, Wherein the anode electrode is disposed on the plurality of side walls.
19. 19. A display system, wherein the display system comprises: processor, and A display device comprising pixels, wherein the display device displays an image through the pixels under control of the processor, Wherein the display device includes: A substrate on which the first, second and third sub-pixels are defined; A plurality of sidewalls disposed on the substrate; an anode electrode disposed on the substrate to correspond to each of the first, second, and third sub-pixels; a first emission structure disposed on the anode electrode of the first subpixel; a second emission structure disposed on the anode electrode of the second subpixel; a third emission structure disposed on the anode electrode of the third sub-pixel, and A cathode electrode disposed on each of the first, second and third emission structures, Wherein each of the plurality of side walls comprises: a first side wall, and And a second sidewall disposed on the first sidewall and having a width greater than a width of the first sidewall.
20. 20. The display system of claim 19, Wherein the cathode electrode includes: A first cathode electrode contacting the first, second and third emission structures, and A second cathode electrode disposed on the first cathode electrode, and Wherein portions of the second cathode electrode overlapping the first, second, and third emission structures, respectively, have different thicknesses from each other.

Description

Display device, display system, and method of manufacturing display device Cross Reference to Related Applications The present application claims priority from korean patent application No. 10-2024-0153755 filed on 1 month 11 of 2024, and the entire contents of this korean patent application are incorporated herein by reference. Technical Field Various embodiments of the present disclosure relate to a display device, a display system including the display device, and a method of manufacturing the display device. Background With the development of information technology, importance of a display device as a medium for connecting a user and information has become more and more important. Accordingly, research and development of display devices have been continuously conducted. Organic Light Emitting Diodes (OLEDs) are active emissive display elements characterized by wide viewing angles, high contrast, low voltage operation, and relatively high response speeds. The display device may include a plurality of layers, and light emitted from the OLED may pass through the plurality of layers and be provided outward. Thus, the plurality of layers included in the display device may change the optical characteristics of the emitted light. Disclosure of Invention Embodiments of the present disclosure relate to a display device having improved light efficiency and lifetime, a display system including the display device, and a method of manufacturing the display device. Embodiments of the present disclosure relate to a method of manufacturing a display device capable of simplifying a manufacturing process. Embodiments of the present disclosure provide a display device including a substrate on which a first subpixel, a second subpixel, and a third subpixel are defined, a plurality of sidewalls disposed on the substrate, an anode electrode disposed on the substrate to correspond to each of the first subpixel, the second subpixel, and the third subpixel, a first emission structure disposed on the anode electrode of the first subpixel, a second emission structure disposed on the anode electrode of the second subpixel, a third emission structure disposed on the anode electrode of the third subpixel, a cathode electrode disposed on the first emission structure, the second emission structure, and the third emission structure, and a capping layer disposed on the cathode electrode. In such an embodiment, each of the plurality of sidewalls includes a first sidewall and a second sidewall disposed on the first sidewall and having a width greater than a width of the first sidewall. In such an embodiment, the capping layer does not overlap at least one of the first emission structure, the second emission structure, and the third emission structure in a plan view. In an embodiment, a display device may include a pixel defining layer disposed under a plurality of sidewalls. In such embodiments, the pixel defining layer may expose at least a portion of the anode electrode. In such an embodiment, the plurality of sidewalls may be located in regions between the first, second and third emission structures, respectively. In an embodiment, the anode electrode may be disposed on a plurality of sidewalls. In an embodiment, the display device may further include a pixel defining layer surrounding the anode electrode. In such an embodiment, the pixel defining layer may be disposed on the second sidewall. In such an embodiment, the anode electrode may have a surface area smaller than that of the second sidewall in a plan view. In an embodiment, the cathode electrode may include a first cathode electrode contacting the first, second, and third emission structures, and a second cathode electrode disposed on the first cathode electrode. In an embodiment, the second cathode electrode may include a Transparent Conductive Oxide (TCO). In such an embodiment, the second cathode electrode may surround the second sidewall. In an embodiment, the capping layer may have a first transmittance and a first refractive index with respect to light in the visible light range. In such an embodiment, the second cathode electrode may have a second transmittance and a second refractive index with respect to light in the visible light range. In such an embodiment, the first transmittance may be in the range of 0.9 to 1.1 times the second transmittance. In such an embodiment, the first refractive index may be in the range of 0.9 to 1.1 times the second refractive index. In an embodiment, the capping layer may not overlap one of the first, second, and third emission structures in a plan view, and the capping layer may overlap the remaining two of the first, second, and third emission structures in a plan view. In an embodiment, the capping layer may not overlap with two of the first, second, and third emission structures in a plan view, and the capping layer may overlap with the remaining one of the first, second, and third emission structures in a plan view. In an embodimen