Organic light emitting diode display device for improving light extraction efficiency of pixels

Patent metadata

Field	Value
Publication number	US-10903455-B2
Application number	US-201916672476-A
Country	US
Kind code	B2
Filing date	Nov 3, 2019
Priority date	Jun 30, 2017
Publication date	Jan 26, 2021
Grant date	Jan 26, 2021

Abstract

Disclosed is a light emitting display device which facilitates to improve light-extraction efficiency of pixels, and to maximize light-extraction efficiency of each pixel, wherein the light emitting display device includes a substrate having a first area and a second area, a planarization coating layer prepared on the substrate and configured to have a first curve pattern prepared on the first area, and a second curve pattern prepared on the second area, and an emission device prepared on the first curve pattern and the second curve pattern, wherein a thickness of the planarization coating layer overlapping the first curve pattern is different from a thickness of the planarization coating layer overlapping the second curve pattern, and each of the first curve pattern and the second curve pattern includes a plurality of protruding portions having an aspect ratio of 0.4˜0.6.

First claim

What is claimed is:

1. A light emitting display device comprising:
a substrate having a first area and a second area;
a coating layer disposed on the substrate and having a plurality of protruding portions in each of the first area and the second area; and
an emission element disposed on the plurality of protruding portions,
wherein a pitch between two adjacent protruding portions disposed in the first area is different from a pitch between two adjacent protruding portions disposed in the second area.

2. The light emitting display device of claim 1 , wherein a thickness of the coating layer vertically overlapping the first area is different from a thickness of the coating layer vertically overlapping the second area.

3. The light emitting display device of claim 1 , wherein the pitch between two adjacent protruding portions disposed in the first area is greater than the pitch between two adjacent protruding portions disposed in the second area.

4. The light emitting display device of claim 1 , further comprising:
red, green and blue subpixels at the first area; and
a white subpixel at the second area.

5. The light emitting display device of claim 4 , wherein the pitch between two adjacent protruding portions disposed in the white subpixel is different from the pitch between two adjacent protruding portions disposed in at least one subpixel of the red, green and blue subpixels.

6. The light emitting display device of claim 1 ,
wherein the plurality of protruding portions includes a bottom portion adjacent to the substrate, and an apex portion disposed at a predetermined height from the bottom portion, and
wherein a thickness of the emission element disposed between the bottom portion and the apex portion of each of the plurality of protruding portions is less than a thickness of the emission element disposed between the bottom portion and/or the apex portion of each of the plurality of protruding portions.

7. The light emitting display device of claim 1 ,
wherein the plurality of protruding portions includes a bottom portion adjacent to the substrate, and an apex portion disposed at a predetermined height from the bottom portion, and
wherein a luminance of the emission element disposed on the apex portion of each of the plurality of protruding portions is greater than a luminance of the emission element disposed on the bottom portion of each of the plurality of protruding portions.

8. The light emitting display device of claim 1 , further comprising a color filter layer disposed at the first area between the substrate and the plurality of protruding portions,
wherein an end of the color filter layer extends pass through an end of an area overlapping the plurality of protruding portions.

9. The light emitting display device of claim 1 , further comprising a plurality of recess portions surrounded by the plurality of protruding portions, and
wherein the plurality of recess portions are arranged in a line along a first direction and a zigzag type along a second direction.

10. The light emitting display device of claim 1 , further comprising a plurality of recess portions surrounded by the plurality of protruding portions, and
wherein the plurality of protruding portions has a honeycomb structure or a hexagonal shape in plan view.

11. A light emitting display device comprising:
a substrate;
a pixel disposed on the substrate and including a plurality of subpixels;
a coating layer disposed on the substrate and having a plurality of protruding portions in each of the plurality of subpixels; and
an emission element disposed on the plurality of protruding portions,
wherein a pitch between two adjacent protruding portions disposed in at least one subpixel of the plurality of subpixels is different from a pitch between two adjacent protruding portions disposed in the adjacent subpixels.

12. The light emitting display device of claim 11 , wherein the pitch between two adjacent protruding portions disposed in at least one subpixel of the plurality of subpixels is greater than the pitch between two adjacent protruding portions disposed in the adjacent subpixels.

13. The light emitting display device of claim 11 ,
wherein the pixel comprise a red subpixel, a green subpixel, a blue subpixel, and a white subpixel, and
wherein the pitch between two adjacent protruding portions disposed in the white subpixel is different from the pitch between two adjacent protruding portions disposed in at least one subpixel of the red, green and blue subpixels.

14. The light emitting display device of claim 11 ,
wherein the pixel comprise a red subpixel, a green subpixel, a blue subpixel, and a white subpixel, and
wherein the pitch between two adjacent protruding portions disposed in the white subpixel is greater than the pitch between two adjacent protruding portions disposed in at least one subpixel of the red, green and blue subpixels.

15. The light emitting display device of claim 11 ,
wherein the pixel comprise a red subpixel, a green subpixel, a blue subpixel, and a white subpixel, and
wherein a thickness of the coating layer disposed on the white subpixel is different from a thickness of the coating layer disposed on at least one subpixel of the red, green and blue subpixels.

16. The light emitting display device of claim 11 ,
wherein the plurality of protruding portions includes a bottom portion adjacent to the substrate, and an apex portion disposed at a predetermined height from the bottom portion, and
wherein a thickness of the emission element disposed between the bottom portion and the apex portion of each of the plurality of protruding portions is less than a thickness of the emission element disposed between the bottom portion and/or the apex portion of each of the plurality of protruding portions.

17. The light emitting display device of claim 11 ,
wherein the plurality of protruding portions includes a bottom portion adjacent to the substrate, and an apex portion disposed at a predetermined height from the bottom portion, and
wherein a luminance of the emission element disposed on the apex portion of each of the plurality of protruding portions is greater than a luminance of the emission element disposed on the bottom portion of each of the plurality of protruding portions.

18. The light emitting display device of claim 11 , further comprising a color filter layer disposed at the first area between the substrate and the plurality of protruding portions,
wherein an end of the color filter layer extends pass through an end of an area overlapping the plurality of protruding portions.

19. The light emitting display device of claim 11 , further comprising a plurality of recess portions surrounded by the plurality of protruding portions, and
wherein the plurality of recess portions are arranged in a line along a first direction and a zigzag type along a second direction.

20. The light emitting display device of claim 11 , further comprising a plurality of recess portions surrounded by the plurality of protruding portions, and
wherein the plurality of protruding portions has a honeycomb structure or a hexagonal shape in plan view.

Assignees

• Lg Display Co Ltd

Inventors

• Kim Soo-Kang
• Koo Won-Hoe
• Jang Ji-Hyang
• Jo So-Young

Classifications

• H10K59/131

  Interconnections, e.g. wiring lines or terminals · CPC title

• H10K59/8791

  Arrangements for improving contrast, e.g. preventing reflection of ambient light · CPC title

• H10K59/879

  comprising refractive means, e.g. lenses · CPC title

• H10K59/873

  Encapsulations · CPC title

• H10K59/80521

  characterised by their shape · CPC title