IP Library › Granted Patent US 12,707,820
Granted Patent B2
US 12,707,820 · App. 18/276,078 · Granted Aug 11, 2026

Display device comprising partition covering adjacent pixel electrodes and manufacturing method of display device

Inventors: Rai Sato (Tochigi, JP); Masahiro Katayama (Tochigi, JP); Naoto Goto (Tochigi, JP); Yasutaka Nakazawa (Tochigi, JP); Kenichi Okazaki (Atsugi, JP)
Assignee: Semiconductor Energy Laboratory Co., Ltd.
H10K59/122H10K59/1201
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Quick Facts
Patent No.
US 12,707,820
App. No.
18/276,078
Granted
Aug 11, 2026
Kind
B2
Abstract

A high-resolution display device is provided. A display device with both high display quality and high resolution is provided. The display device includes a first display element including a first pixel electrode, a first EL layer, and a common electrode; a second display element including a second pixel electrode, a second EL layer, and the common electrode; a first insulating layer covering an end portion of the first pixel electrode and an end portion of the second pixel electrode; a second insulating layer over the first insulating layer; and a third insulating layer over the second insulating layer. The first EL layer is placed over the first pixel electrode and the third insulating layer. The second EL layer is placed over the second pixel electrode and the third insulating layer.

Claims (44)

1 . A display device comprising:

a first display element comprising a first pixel electrode, a first EL layer, and a common electrode;

a second display element comprising a second pixel electrode, a second EL layer, and the common electrode;

a first insulating layer covering an end portion of the first pixel electrode and an end portion of the second pixel electrode;

a second insulating layer over the first insulating layer; and

a third insulating layer over the second insulating layer,

wherein the first EL layer is placed over the first pixel electrode and the third insulating layer, and

wherein the second EL layer is placed over the second pixel electrode and the third insulating layer.

2 . The display device according to claim 1 ,

wherein the third insulating layer comprises a region in contact with the first insulating layer over the first pixel electrode.

3 . The display device according to claim 1 ,

wherein the first insulating layer and the third insulating layer comprise an inorganic material, and

wherein the second insulating layer comprises an organic material.

4 . A display device comprising:

a first display element comprising a first pixel electrode, a first EL layer, and a common electrode;

a second display element comprising a second pixel electrode, a second EL layer, and the common electrode;

a first insulating layer covering an end portion of the first pixel electrode and an end portion of the second pixel electrode; and

a second insulating layer over the first insulating layer,

wherein the first EL layer is placed over the first pixel electrode and the second insulating layer,

wherein the second EL layer is placed over the second pixel electrode and the second insulating layer,

wherein the first insulating layer comprises an inorganic material,

wherein the second insulating layer comprises an organic material,

wherein the first insulating layer and the second insulating layer are part of a first partition, and

wherein each layer of the first partition overlaps with the end portion of the first pixel electrode and the end portion of the second pixel electrode.

5 . The display device according to claim 4 ,

wherein the first EL layer comprises a region in contact with the first insulating layer over the first pixel electrode, and

wherein the second EL layer comprises a region in contact with the first insulating layer over the second pixel electrode.

6 . The display device according to claim 4 ,

wherein the second insulating layer comprises a region in contact with the first pixel electrode and a region in contact with the second pixel electrode.

7 . A method for manufacturing a display device, comprising steps of:

forming a pixel electrode;

forming a first insulating film over the pixel electrode;

forming a second insulating layer over the first insulating film to cover an end portion of the pixel electrode;

forming a first insulating layer covering the end portion of the pixel electrode by etching the first insulating film using a resist mask;

forming an EL layer over the pixel electrode and the second insulating layer; and

forming a common electrode over the EL layer,

wherein the first insulating layer comprises an inorganic material,

wherein the second insulating layer comprises an organic material, and

wherein the common electrode is not in contact with the first insulating layer and the second insulating layer.

8 . The display device according to claim 4 , wherein the first EL layer is not in contact with the second insulating layer.

9 . The display device according to claim 4 , wherein the common electrode is not in contact with the first insulating layer and the second insulating layer.

10 . The method according to claim 7 , wherein the EL layer is not in contact with the second insulating layer.

11 . The method according to claim 7 , wherein the second insulating layer has a curved top surface.

12 . The display device according to claim 4 , wherein the second insulating layer has a curved top surface.