Granted Patent B2

US 12,317,731 · App. 17/455,042 · Granted May 27, 2025

Inventors: Sho Yanagisawa (Tokyo, JP); Tetsuo Morita (Tokyo, JP); Kenji Harada (Tokyo, JP); Hiroshi Tabatake (Tokyo, JP); Hideyuki Takahashi (Tokyo, JP)

Assignee: Japan Display Inc.

H10K59/88H10K59/122H10K59/131

Abstract

Claims (73)

1. A display device comprising:

a base;

a first insulating layer disposed on the base;

a first pixel electrode disposed on the first insulating layer in a pixel located in a display area;

a second pixel electrode disposed on the first insulating layer in a dummy pixel located in a peripheral area on an outer side of the display area;

a second insulating layer disposed on the first insulating layer and comprising an opening overlapping the first pixel electrode;

a first organic layer disposed in the pixel and in contact with the first pixel electrode via the opening;

a second organic layer disposed in the dummy pixel;

a partition wall disposed on the second insulating layer and between the first organic layer and the second organic layer; and

a common electrode covering the first organic layer, the second organic layer and the partition wall,

wherein

an end portion of the first organic layer is in contact with a side surface of the partition wall.

2. The display device of claim 1 , wherein

the partition wall has such a shape that a width of an upper portion is less than a width of a lower portion.

3. The display device of claim 1 , wherein

the common electrode includes a first portion covering the first organic layer, a second portion covering the second organic layer, and a third portion covering the partition wall, and

the third portion is connected to the first portion and the second portion.

4. The display device of claim 3 , wherein

the common electrode comprises a first layer covering the first organic layer and the partition wall, and a second layer covering the first layer.

5. The display device of claim 4 , wherein

the first layer in the first portion and the first layer in the third portion are separated from each other, and

the second layer in the first portion and the second layer in the third portion are connected to each other.

6. The display device of claim 4 , wherein

the second portion includes the second layer and does not include the first layer.

7. The display device of claim 3 , wherein

a thickness of the first portion is greater than a thickness of the second portion.

8. The display device of claim 1 , further comprising:

a power feed line disposed on the partition wall,

wherein

the common electrode includes a first portion covering the first organic layer and a second portion covering the second organic layer, and

the power feed line is in contact with the first portion and the second portion.

9. The display device of claim 8 , wherein

the common electrode further comprises a third portion covering the partition wall, and

the third portion is located between the partition wall and the power feed line, and is separated from the first portion and the second portion.

10. The display device of claim 1 , wherein

the second pixel electrode and the second organic layer oppose each other via the second insulating layer.

11. A display device comprising:

a base;

a first insulating layer disposed on the base;

a first pixel electrode disposed on the first insulating layer in a pixel located in a display area;

a second pixel electrode disposed on the first insulating layer in a dummy pixel located in a peripheral area on an outer side of the display area;

a second insulating layer disposed on the first insulating layer and comprising an opening overlapping the first pixel electrode;

a first organic layer disposed in the pixel and in contact with the first pixel electrode via the opening;

a second organic layer disposed in the dummy pixel;

a partition wall disposed on the second insulating layer and between the first organic layer and the second organic layer;

a common electrode covering the first organic layer, the second organic layer and the partition wall; and

a first conductive layer located between the first insulating layer and the second insulating layer,

wherein

an end portion of the first organic layer is in contact with a side surface of the partition wall,

the second insulating layer comprises a first contact hole in the peripheral area,

the common electrode includes a fourth portion in the peripheral area, and

the fourth portion is in contact with the first conductive layer via the first contact hole.

12. The display device of claim 11 , further comprising:

a third organic layer disposed on the second insulating layer and covered by the fourth portion.

13. The display device of claim 12 , wherein

the third organic layer is formed into a ring shape in the peripheral area.

14. The display device of claim 12 , wherein

the dummy pixel is located between the display area and the third organic layer.

15. The display device of claim 11 , wherein

the first conductive layer is formed into a ring shape in the peripheral area.

16. The display device of claim 11 , wherein

the dummy pixel is located between the display area and the first conductive layer in planar view.

17. The display device of claim 11 , further comprising:

a second conductive layer located between the base and the first insulating layer,

wherein

the first insulating layer comprises a second contact hole in the peripheral area, and

the first conductive layer is in contact with the second conductive layer via the second contact hole.

18. The display device of claim 17 , wherein

the second conductive layer is formed into a ring shape in the peripheral area.

19. The display device of claim 17 , wherein

the dummy pixel is located between the display area and the second conductive layer in planar view.

20. The display device of claim 17 , wherein

an edge of the common electrode is located between the first contact hole and the second contact hole in planar view.

Assignments (2)

Priority Claims (1)

Continuity (1)

References Cited (24)