Display device comprising a first partition wall and a second partition wall

Patent metadata

Field	Value
Publication number	US-11296159-B2
Application number	US-202016734980-A
Country	US
Kind code	B2
Filing date	Jan 6, 2020
Priority date	Apr 10, 2019
Publication date	Apr 5, 2022
Grant date	Apr 5, 2022

Abstract

An embodiment of the present disclosure provides a display device including a substrate, a thin film transistor on the substrate, a first electrode electrically connected to the thin film transistor, a light emitting layer and a second electrode overlapping the first electrode, a first partition wall between the first electrode and the second electrode, and a second partition wall overlapping the first partition wall, wherein the first partition wall includes at least one of a black pigment and a black dye, wherein the second partition wall includes an organic insulating material, and wherein a portion of the second partition wall overlaps the first electrode.

First claim

What is claimed is:

1. A display device comprising:
a substrate;
a thin film transistor on the substrate;
a first electrode electrically connected to the thin film transistor;
a light emitting layer and a second electrode overlapping the first electrode;
a first partition wall between the first electrode and the second electrode;
a second partition wall overlapping the first partition wall; and
a third partition wall on the second partition wall,
wherein the first partition wall comprises at least one of a black pigment and a black dye,
wherein the second partition wall comprises an organic insulating material,
wherein a portion of the second partition wall overlaps the first electrode, and
wherein a first maximum distance from the substrate to the second electrode in a thickness direction on a first side of the light emitting layer is different than a second maximum distance from the substrate to the second electrode in a thickness direction on a second side of the light emitting layer due to the third partition wall being on only one of the first side or the second side, or due to the third partition wall having different respective thicknesses on the first side and on the second side.

2. The display device of claim 1 , wherein an end of the second partition wall contacts the first electrode, and
wherein a width of an area at which the second partition wall and the first electrode contact each other is about 2 micrometers or more.

3. The display device of claim 1 , wherein the second partition wall comprises a first region and a second region that have different thicknesses.

4. The display device of claim 3 , wherein the display device further comprises an encapsulation layer on the second electrode, and
wherein the second region supports the encapsulation layer.

5. The display device of claim 1 , wherein the first electrode comprises a first layer, a second layer, and a third layer,
wherein each of the first layer and the third layer comprises ITO, IZO, ZnO, In 2 O 3 , IGO, or AZO, and
wherein the second layer comprises Ag, Mg, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, or a compound thereof.

6. The display device of claim 5 , wherein a surface of the first electrode defines a groove exposing the second layer.

7. The display device of claim 1 , wherein the second partition wall is on the first electrode, and
wherein the first partition wall is on the second partition wall.

8. The display device of claim 7 , wherein the second partition wall comprises a first region and a second region that have different thicknesses.

9. The display device of claim 7 , wherein the first partition wall is on an upper surface of the second partition wall.

10. The display device of claim 9 , wherein the first partition wall overlaps the upper surface and two lateral surfaces of the second partition wall.

11. The display device of claim 1 , wherein the third partition wall and the second partition wall comprise a same material.

12. The display device of claim 1 , wherein the third partition wall contacts an upper surface of the second partition wall.

13. The display device of claim 1 , further comprising an insulating layer between the thin film transistor and the first electrode,
wherein the first partition wall and the second partition wall contact the insulating layer.

14. A display device comprising:
a substrate;
a thin film transistor on the substrate;
a first electrode connected to the thin film transistor;
an insulating layer between the first electrode and the thin film transistor;
a first partition wall and a second partition wall overlapping the insulating layer the second partition wall comprising a first region and a second region having different thicknesses; and
a light emitting layer and a second electrode overlapping the first electrode,
wherein an end of the second partition wall contacts an upper surface of the first electrode, and
wherein a first maximum distance from the substrate to the second electrode in a thickness direction on a first side of the light emitting layer is different than a second maximum distance from the substrate to the second electrode in a thickness direction on a second side of the light emitting layer due to the first region and the second region having different thicknesses.

15. The display device of claim 14 , wherein an amount of at least one of a black pigment and a black dye in the first partition wall is greater than an amount of at least one of a black pigment and a black dye comprised in the second partition wall.

16. The display device of claim 14 , further comprising an encapsulation layer,
wherein a thickness of the second region is greater than that of the first region, and
wherein the second region supports the encapsulation layer.

17. The display device of claim 14 , wherein the light emitting layer comprises a quantum dot.

18. The display device of claim 14 , wherein the second partition wall contacts a lateral surface of the first partition wall and an upper surface of the first electrode.

19. The display device of claim 14 , wherein the first partition wall is spaced apart from the first electrode.

20. A display device comprising:
a substrate;
a thin film transistor on the substrate;
a first electrode connected to the thin film transistor;
an insulating layer between the first electrode and the thin film transistor;
a first partition wall and a second partition wall overlapping the insulating layer; and
a light emitting layer and a second electrode overlapping the first electrode,
wherein an end of the second partition wall contacts an upper surface of the first electrode, and
wherein an amount of sulfur (S) in the first partition wall is less than an amount of sulfur (S) in the second partition wall.

Assignees

• Samsung Display Co Ltd

Inventors

• Choi Nak Cho
• Kweon Dae-Gi
• Kim Ji Hee
• Nam Kie Hyun
• Ryu Min Yeul
• Yu Sang Hee
• Lee Jun Hee
• Jung Da-Young

Classifications

• H10K50/805

  Electrodes · CPC title

• H10K50/865

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

• H10K50/844

  Encapsulations · CPC title

• H10K59/1275

  Electrical connections of the two substrates · CPC title

• H10K59/8792

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