Display device

Patent metadata

Field	Value
Publication number	US-10490603-B2
Application number	US-201815943826-A
Country	US
Kind code	B2
Filing date	Apr 3, 2018
Priority date	Apr 13, 2017
Publication date	Nov 26, 2019
Grant date	Nov 26, 2019

Abstract

A display device may include an insulation layer having openings, the insulation layer having opening edges around the respective openings; pixel electrodes in the respective openings and on the respective opening edges; an electroluminescence layer continuously on the pixel electrodes, the electroluminescence layer consisting of some layers including a bottom layer thereof, the electroluminescence layer including a light emitting layer in one of the layers except for at least the bottom layer, the light emitting layer overlapping with a corresponding one of the pixel electrodes; and a counter electrode on the electroluminescence layer.

First claim

What is claimed is:

1. A display device comprising:
an insulation layer having a plurality of openings, the insulation layer having a plurality of opening edges around the respective openings;
a plurality of pixel electrodes in the respective openings and on the respective opening edges;
an electroluminescence layer continuously on the plurality of pixel electrodes, the electroluminescence layer consisting of some layers including a bottom layer thereof, the electroluminescence layer including a light emitting layer in one of the layers except for at least the bottom layer, the light emitting layer overlapping with a corresponding one of the pixel electrodes;
a counter electrode on the electroluminescence layer; and
a plurality of underlying electrodes under the respective pixel electrodes and the insulation layer, wherein
the plurality of underlying electrodes are connected to the respective pixel electrodes in the respective openings, and
each of the plurality of opening edges of the insulation layer is interposed between a periphery of a corresponding one of the underlying electrodes and a periphery of a corresponding one of the pixel electrodes.

2. The display device according to claim 1 , wherein the plurality of underlying electrodes have a thickness greater than the plurality of pixel electrodes.

3. The display device according to claim 1 , wherein at least one of each of the plurality of pixel electrodes and each of the plurality of underlying electrodes includes a light reflective layer.

4. The display device according to claim 3 , wherein
each of the plurality of underlying electrodes includes the light reflective layer, and
none of the plurality of pixel electrodes includes the light reflective layer.

5. The display device according to claim 3 , wherein
each of the plurality of underlying electrodes includes the light reflective layer, and
each of the plurality of pixel electrodes includes the light reflective layer so as not to overlap with a corresponding one of the openings.

6. The display device according to claim 1 , wherein
the periphery of each of the plurality of pixel electrodes has a less thickness at a position closer to a tip thereof.

7. The display device according to claim 1 , wherein the bottom layer of the electroluminescence layer is a carrier injection transport layer continuously on the plurality of pixel electrodes.

8. The display device according to claim 1 , wherein the light emitting layer protrudes from a corresponding one of the pixel electrodes.

9. The display device according to claim 1 , wherein the light emitting layer is each of light emitting layers disposed to be separated from one another in response to the respective pixel electrodes.

10. The display device according to claim 9 , wherein an adjacent pair of the light emitting layers have end portions overlapping with each other.

11. A display device comprising:
an insulation layer having a plurality of openings, the insulation layer having a plurality of opening edges around the respective openings;
a plurality of pixel electrodes in the respective openings and on the respective opening edges;
an electroluminescence layer continuously on the plurality of pixel electrodes, the electroluminescence layer consisting of some layers including a bottom layer thereof, the electroluminescence layer including a light emitting layer in one of the lavers except for at least the bottom layer, the light emitting layer overlapping with a corresponding one of the pixel electrodes; and
a counter electrode on the electroluminescence layer,
wherein the electroluminescence layer has a low conductive portion, with lower conductivity than other portions, between an adjacent pair of the pixel electrodes.

12. The display device according to claim 11 , wherein the light emitting layer has a portion, which is included in the low conductive portion, between the adjacent pair of the pixel electrodes.

13. The display device according to claim 11 , wherein the low conductive portion continuously surrounds at least a central portion of each of the plurality of pixel electrodes.

14. The display device according to claim 11 , wherein
the plurality of pixel electrodes fall into some groups in response to respective colors,
the light emitting layer is configured to emit light in a corresponding one of the colors in response to the respective groups, and
the low conductive portion is between an adjacent pair of the pixel electrodes included in different two of the groups.

Assignees

• Japan Display Inc

Inventors

• Ma Chunche
• Akimoto Hajime
• Gunji Masakazu

Classifications

• H01L27/3211 Primary

  Electricity · mapped topic

• H01L27/3246

  Electricity · mapped topic

• H01L51/5215

  Electricity · mapped topic

• H01L27/3248

  Electricity · mapped topic

• H01L27/3258

  Electricity · mapped topic