Light emitting display device

Patent metadata

Field	Value
Publication number	US-10522789-B2
Application number	US-201816023106-A
Country	US
Kind code	B2
Filing date	Jun 29, 2018
Priority date	Jun 30, 2017
Publication date	Dec 31, 2019
Grant date	Dec 31, 2019

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 planarization coating layer disposed on the substrate and having a first curve pattern at the first area, and a second curve pattern at the second area; and
an emission element disposed on the first curve pattern and the second curve pattern,
wherein a thickness of the planarization coating layer vertically overlapping the first curve pattern is different from a thickness of the planarization coating layer vertically 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 in a range of 0.4˜0.6.

2. The light emitting display device according to claim 1 , further comprising:
red, green and blue pixels at the first area; and
a white pixel at the second area.

3. The light emitting display device according to claim 2 , wherein the plurality of protruding portions has a half-height aspect ratio in a range of 0.45˜0.7.

4. The light emitting display device according to claim 2 , wherein the plurality of protruding portions has a pitch in a range of 4˜12 micrometer (μm), and a height in a range of 0.8˜3.6 micrometer (μm).

5. The light emitting display device according to claim 2 , wherein the plurality of protruding portions includes:
a bottom portion adjacent to the substrate;
an apex portion disposed at a predetermined height from the bottom portion; and
a lateral portion disposed between the bottom portion and the apex portion.

6. The light emitting display device according to claim 5 , wherein the lateral portion has a curved-line shape including an inflection point.

7. The light emitting display device according to claim 5 , wherein the first curve pattern and the second curve pattern further comprise a plurality of recess portions,
wherein the plurality of protruding portions having bottom portions connected with each other, and each of the plurality of recess portions is surrounded by the plurality of protruding portions.

8. The light emitting display device according to claim 6 , wherein the emission device includes a first electrode, an emission layer and a second electrode sequentially disposed on the first curve pattern and the second curve pattern, and
each of the first electrode, the emission layer and the second electrode has a shape matching a contour of each of the first curve pattern and the second curve pattern.

9. The light emitting display device according to claim 8 , wherein the lateral portion includes:
an inflection point portion including the inflection point;
a first curved-line portion between the inflection point portion and the bottom portion; and
a second curved-line portion between the inflection point portion and the apex portion,
wherein a thickness of the emission device for covering the inflection point portion is smaller than a thickness of the emission device for covering each of the first curved-line portion and the second curved-line portion.

10. The light emitting display device according to claim 9 , wherein the first curved-line portion, the inflection point portion and the second curved-line portion having a ratio of a height of 1:3:1 with respect to a height of the protruding portion.

11. The light emitting display device according to claim 2 , further comprising a color filter layer disposed between the substrate and the first curve pattern,
wherein the first area includes a red sub area having the red pixel, a green sub area having the green pixel, and a blue sub area having the blue pixel, and
the color filter layer includes a red color filter disposed at the red sub area, a green color filter disposed at the green sub area, and a blue color filter disposed at the blue sub area.

12. The light emitting display device according to claim 11 , wherein a thickness of the planarization coating layer disposed between the bottom surface of the first curve pattern and the color filter layer is smaller than a thickness of the planarization coating layer disposed between the bottom surface of the second curve pattern and the substrate.

13. The light emitting display device according to claim 11 , wherein a minimum distance between the first curve pattern and the color filter layer is in a range of 0.1 to 3 micrometer (μm).

14. The light emitting display device according to claim 11 , further comprising a barrier layer on the substrate,
wherein the barrier layer is disposed between the first curve pattern and the color filter layer in the first area, and between the second curve pattern and the substrate in the second area.

15. The light emitting display device according to claim 14 , wherein the barrier layer has a thickness in a range of 0.1 to 3 micrometer (μm).

16. The light emitting display device according to claim 14 , further comprising:
a thin film transistor layer disposed at the first area and the second area; and
an insulating layer disposed on the substrate and covering the thin film transistor layer and supporting the color filter layer,
wherein the barrier layer covers the color filter layer and the insulating layer.

17. The light emitting display device according to claim 16 , wherein the barrier layer is formed of a same material as that of the insulating layer.

18. A light emitting display device comprising:
a substrate having a first area and a second area;
a planarization coating layer disposed on the substrate and having a first curve pattern at the first area, and a second curve pattern at the second area, wherein a thickness of the planarization coating layer vertically overlapping the first curve pattern is different from a thickness of the planarization coating layer vertically 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 in a range of 0.4 to 0.6; and
an emission element disposed on the first curve pattern and the second curve pattern,
wherein the plurality of protruding portions includes a bottom portion adjacent to the substrate, an apex portion disposed at a predetermined height from the bottom portion, and a lateral portion disposed between the bottom portion and the apex portion.

19. The light emitting display device according to claim 18 , wherein the lateral portion has a curved-line shape including an inflection point.

20. The light emitting display device according to claim 18 , wherein the first curve pattern and the second curve pattern further comprise a plurality of recess portions, and
wherein the plurality of protruding portions having bottom portions connected with each other, and each of the plurality of recess portions is surrounded by the plurality of protruding portions.

Assignees

• Lg Display Co Ltd

Inventors

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

Classifications

• G09G3/3275

  Details of drivers for data electrodes · CPC title

• G09G3/3258

  with pixel circuitry controlling the voltage across the light-emitting element · CPC title

• G09G3/2003

  Display of colours (specific for liquid crystal displays G09G3/3607) · CPC title

• G09G3/3266

  Details of drivers for scan electrodes · CPC title

• H01L51/5209

  Electricity · mapped topic