Display apparatus having a bank layer including a first bank portion and a second bank portion

Patent metadata

Field	Value
Publication number	US-12433129-B2
Application number	US-202217853985-A
Country	US
Kind code	B2
Filing date	Jun 30, 2022
Priority date	Jul 1, 2021
Publication date	Sep 30, 2025
Grant date	Sep 30, 2025

Abstract

A display apparatus includes: a display substrate including a first substrate and a light-emitting element disposed on the first substrate; and a color filter substrate arranged to face the display substrate, wherein the color filter substrate includes: a second substrate; a color filter layer disposed on the second substrate and including a first color filter, a second color filter, and a third color filter; a bank layer disposed on the color filter layer and including a first bank portion that defines a first opening corresponding to the light-emitting element and a second bank portion that defines a second opening around the first opening.

First claim

What is claimed is:

1. A display apparatus comprising:
a display substrate comprising a first substrate and a light-emitting element disposed on the first substrate; and
a color filter substrate disposed to face the display substrate,
wherein the color filter substrate comprises:
a second substrate;
a color filter layer disposed on the second substrate and comprising a first color filter, a second color filter, and a third color filter;
a bank layer disposed on the color filter layer and comprising a first bank portion that defines a first opening corresponding to the light-emitting element and a second bank portion that defines a second opening around the first opening and is disposed not to be overlapped with the first bank portion, wherein a second height from an upper surface of the second substrate to an upper surface of at least part of the second bank portion is less than a first height from the upper surface of the second substrate to an upper surface of the first bank portion; and
a color conversion layer disposed in the first opening.

2. The display apparatus of claim 1 , wherein the first color filter, the second color filter, and the third color filter are disposed between the second substrate and the first bank portion.

3. The display apparatus of claim 1 , wherein at least part of the second bank portion is disposed directly on the second substrate.

4. The display apparatus of claim 1 , wherein at least one of the first color filter, the second color filter, and the third color filter is not disposed between the second substrate and the second bank portion.

5. The display apparatus of claim 4 , wherein the third color filter is disposed between the second substrate and the second bank portion.

6. The display apparatus of claim 1 , wherein an area of the second opening is less than an area of the first opening.

7. The display apparatus of claim 1 , wherein at least one of the first color filter, the second color filter, and the third color filter is exposed through the first opening.

8. The display apparatus of claim 7 , wherein the color conversion layer comprises a first color conversion layer, a second color conversion layer, and a transmissive layer, and
wherein the first color conversion layer is disposed on the first color filter, the second color conversion layer is disposed on the second color filter, and the transmissive layer is disposed on the third color filter.

9. The display apparatus of claim 8 , wherein the first color conversion layer comprises a first quantum dot and the second color conversion layer comprises a second quantum dot.

10. The display apparatus of claim 1 , wherein the second opening comprises a plurality of second openings,
wherein the second bank portion comprises a branch portion in which second bank portions extending in different directions cross each other, and
wherein a height from the upper surface of the second substrate to an upper surface of the branch portion is less than a height from the upper surface of the second substrate to the upper surface of the first bank portion.

11. The display apparatus of claim 10 , wherein a height from the upper surface of the second substrate to the upper surface of the branch portion is less than a height from the upper surface of the second substrate to an upper surface of the second bank portion except the branch portion.

12. The display apparatus of claim 10 , wherein a step between the upper surface of the branch portion and the upper surface of the first bank portion is about 3.5 μm or more.

13. The display apparatus of claim 1 , wherein at least one of the first color filter, the second color filter, and the third color filter is disposed in the second opening.

14. The display apparatus of claim 1 , wherein the color filter layer has a step between the second substrate and the bank layer.

15. The display apparatus of claim 14 , wherein at least one of the first color filter, the second color filter, and the third color filter has a portion having a reduced thickness and disposed between the second substrate and the second bank portion.

16. The display apparatus of claim 14 , wherein a thickness of at least one of the first color filter, the second color filter and the third color filter disposed in a region corresponding to the second bank portion is less than a thickness of at least one of the first color filter, the second color filter, and the third color filter disposed in a region corresponding to the first bank portion.

17. The display apparatus of claim 14 , wherein the second opening comprises a plurality of second openings,
wherein the second bank portion comprises a branch portion in which second bank portions extending in different directions cross each other, and
wherein a thickness of at least one of the first color filter, the second color filter, and the third color filter in a region corresponding to the branch portion is less than the thickness of the at least one of the first color filter, the second color filter, and the third color filter in a remaining second bank portion except the branch portion.

18. The display apparatus of claim 1 , wherein the light-emitting element comprises an organic light-emitting diode configured to emit blue light.

19. The display apparatus of claim 1 , wherein the display substrate further comprises a thin film encapsulation layer that is disposed to cover the light-emitting element, and
a distance from an upper surface of the thin film encapsulation layer to an upper surface of the second bank portion is greater than a distance from the upper surface of the thin film encapsulation layer to the upper surface of the first bank portion.

20. The display apparatus of claim 19 , wherein the second opening comprises a plurality of second openings,
wherein the second bank portion comprises a branch portion in which second bank portions extending in different directions cross each other, and
a distance from the upper surface of the thin film encapsulation layer to an upper surface of the branch portion is greater than the distance from the upper surface of the thin film encapsulation layer to the upper surface of the first bank portion.

21. The display apparatus of claim 20 , wherein the second opening comprises a plurality of second openings,
wherein the second bank portion comprises a branch portion in which second bank portions extending in different directions cross each other, and
wherein the distance from the upper surface of the thin film encapsulation layer to the upper surface of the branch portion is greater than a distance from the upper surface of the thin film encapsulation layer to the surface of the second bank portion except the branch portion.

22. A display apparatus comprising:
a first substrate and a second substrate disposed to face the first substrate;
a light-emitting element disposed on the first substrate;
a thin film encapsulation layer disposed to cover the light-emitting element, an upper surface of the thin film encapsulation layer having a flat surface;
a bank layer disposed above the thin film encapsulation layer and having a first opening corresponding to the light-emitting element and a second opening disposed around the first opening;
a color conversion layer disposed in the first opening; and
a color filter layer disposed between the second substrate and the color conversion layer, and between the second substrate and the bank layer,
wherein the bank layer comprises a first bank p

Assignees

• Samsung Display Co Ltd

Inventors

• Lee Kyeuk
• Kim Sunkwang
• Lee Geunho

Classifications

• H10K59/122

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

• H10K59/873

  Encapsulations · CPC title

• H10K50/84

  Passivation; Containers; Encapsulations · CPC title

• H10K50/844

  Encapsulations · CPC title

• H10K50/125

  specially adapted for multicolour light emission, e.g. for emitting white light · CPC title