Organic light emitting display device

Patent metadata

Field	Value
Publication number	US-11917856-B2
Application number	US-202117405948-A
Country	US
Kind code	B2
Filing date	Aug 18, 2021
Priority date	Aug 28, 2020
Publication date	Feb 27, 2024
Grant date	Feb 27, 2024

Abstract

An organic light-emitting display device includes first to third color filters disposed respectively in first to third sub-pixel areas, a planarization layer disposed on the first to third color filters, and a bank layer disposed on the planarization layer and between adjacent sub-pixel areas, wherein a portion of the second color filter protrudes upwardly beyond a top face of the planarization layer, wherein the bank layer covers the portion of the second color filter protruding upwardly beyond the top face of the planarization layer. The display device has a stack structure of the portion of the blue color filter protruding upwardly beyond a top face of the planarization layer and the bank layer covering the portion, thereby suppressing light leakage between adjacent sub-pixel areas, and improving a lifetime of an organic light emitting element.

First claim

What is claimed is:

1. An organic light-emissive display device comprising:
a substrate including a first sub-pixel area, a second sub-pixel area, and a third sub-pixel area;
a first color filter disposed in the first sub-pixel area;
a second color filter disposed in the second sub-pixel area;
a third color filter disposed in the third sub-pixel area;
a planarization layer disposed on the first, second, and third color filters; and
a bank layer disposed on the planarization layer and between adjacent ones of the first, second, and third sub-pixel areas,
wherein a portion of the second color filter protrudes upwardly beyond a top face of the planarization layer, and
wherein the bank layer covers the portion of the second color filter protruding upwardly beyond the top face of the planarization layer.

2. The device of claim 1 , wherein opposite portions of the second color filter are disposed respectively between the first sub-pixel area and the second sub-pixel area and between the second sub-pixel area and the third sub-pixel area, and protrude upwardly beyond the top face of the planarization layer.

3. The device of claim 1 , wherein a dummy second color filter is further disposed between the third sub-pixel area and the first sub-pixel area.

4. The device of claim 3 , wherein the dummy second color filter protrudes upwardly beyond the top face of the planarization layer while covering both an end of the third color filter and an end of the first color filter.

5. The device of claim 1 , wherein the first color filter is a red color filter, the second color filter is a blue color filter, and the third color filter is a green color filter.

6. The device of claim 1 , wherein the bank layer contains a black pigment, wherein a transmittance of the bank layer is in a range of 40% to 60% in a 380 nm to 650 nm wavelength range.

7. The device of claim 1 , wherein the bank layer blocks blue light having a wavelength below 480 nm.

8. An organic light-emissive display device comprising:
a substrate including a first sub-pixel area, a second sub-pixel area, a third sub-pixel area, and a fourth sub-pixel area;
a first color filter disposed in the first sub-pixel area;
a second color filter disposed in the third sub-pixel area;
a third color filter disposed in the fourth sub-pixel area;
a planarization layer covering the first, second, and third color filters; and
a bank layer disposed on the planarization layer and between adjacent ones of the first, second, third, and fourth sub-pixel areas, and
wherein a portion of the second color filter protrudes upwardly beyond a top face of the planarization layer, and is inserted into the bank layer.

9. The device of claim 8 , wherein opposite portions of the second color filter are disposed respectively between the second sub-pixel area and the third sub-pixel area and between the third sub-pixel area and the fourth sub-pixel area, and protrude upwardly beyond the top face of the planarization layer.

10. The device of claim 8 , wherein a dummy second color filter is further disposed between the first sub-pixel area and the second sub-pixel area, and covers an end of the first color filter and protrudes upwardly beyond a top face of the planarization layer.

11. The device of claim 10 , wherein an additional dummy second color filter is disposed between the fourth sub-pixel area and the first sub-pixel area, and covers both an end of the third color filter and an end of the first color filter and protrudes upwardly beyond a top face of the planarization layer.

12. The device of claim 8 , wherein the first color filter is a red color filter, the second color filter is a blue color filter, and the third color filter is a green color filter.

13. The device of claim 8 , wherein the bank layer contains a black pigment, wherein a transmittance of the bank layer is in a range of 40% to 60% in a 380 nm to 650 nm wavelength range.

14. The device of claim 1 , wherein the bank layer blocks blue light having a wavelength below 480 nm.

15. An organic light-emissive display device comprising:
a substrate including a plurality of sub-pixel areas;
a plurality of color filters respectively disposed in the plurality of sub-pixel areas;
a planarization layer covering the plurality of color filters; and
a bank layer disposed on the planarization layer and between two adjacent ones of the sub-pixel areas,
wherein a portion of the first color filter among the plurality of color filters protrudes upwardly beyond a top face of the planarization layer and is inserted into the bank layer.

16. The device of claim 15 , wherein the portion of the first color filter protruding upwardly beyond the top face of the planarization layer covers an end of the second color filter among the plurality of color filters.

17. The device of claim 15 , wherein a dummy color filter made of the same material as the first color filter covers an end of a third color filter among the plurality of color filters.

18. The device of claim 15 , wherein a transmittance of the bank layer is in a range of 40% to 60% in a 380 nm to 650 nm wavelength range.

19. The device of claim 15 , wherein the bank layer blocks blue light having a wavelength below 480 nm.

Assignees

• Lg Display Co Ltd

Inventors

• Hwang Seonghan
• Kim Wonrae

Classifications

• H10K59/131

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

• H10K59/8792

  comprising light absorbing layers, e.g. black layers · CPC title

• H10K50/865 Primary

  comprising light absorbing layers, e.g. light-blocking layers · CPC title

• H10K59/38 Primary

  comprising colour filters or colour changing media [CCM] · CPC title

• H10K59/122 Primary

  Pixel-defining structures or layers, e.g. banks · CPC title