Display device and method of fabricating the same

Patent metadata

Field	Value
Publication number	US-11211534-B2
Application number	US-201916698834-A
Country	US
Kind code	B2
Filing date	Nov 27, 2019
Priority date	Dec 4, 2018
Publication date	Dec 28, 2021
Grant date	Dec 28, 2021

Abstract

A display device includes: a pixel circuit disposed on a base layer; an insulating layer disposed on the base layer covering the pixel circuit; a first electrode disposed on the insulating layer; a second electrode disposed on the insulating layer, the second electrode being spaced apart from the first electrode in a first direction; a light-emitting element disposed between the first electrode and the second electrode; a connection electrode connecting the first electrode and the light-emitting element and connecting the second electrode and the light-emitting element; a first auxiliary insulating layer disposed on the light-emitting element; and a second auxiliary insulating layer disposed on the first auxiliary insulating layer. The second auxiliary insulating layer includes a first insulating portion overlapped with the first auxiliary insulating layer, and a second insulating portion disposed outwardly from the first insulating portion and not overlapping the first auxiliary insulating layer.

First claim

What is claimed is:

1. A display device, comprising:
a base layer;
a pixel circuit disposed on the base layer;
an insulating layer disposed on the base layer covering the pixel circuit;
a first electrode electrically connected to the pixel circuit and disposed on the insulating layer;
a second electrode electrically connected to the pixel circuit and disposed on the insulating layer, the second electrode being spaced apart from the first electrode in a first direction;
a light-emitting element disposed between the first electrode and the second electrode and electrically connected to the first electrode and the second electrode;
a connection electrode connecting the first electrode and the light-emitting element and connecting the second electrode and the light-emitting element;
a first auxiliary insulating layer disposed on the light-emitting element; and
a second auxiliary insulating layer made of a different material than the first auxiliary insulating layer, the second auxiliary insulating layer being disposed on the first auxiliary insulating layer such that the first auxiliary insulating layer is disposed between the second auxiliary insulating layer and the light-emitting element,
wherein the second auxiliary insulating layer comprises a first insulating portion overlapped with the first auxiliary insulating layer, and a second insulating portion disposed outwardly from the first insulating portion and not overlapping the first auxiliary insulating layer.

2. The display device of claim 1 , wherein a width of the first auxiliary insulating layer is smaller than a width of the second auxiliary insulating layer.

3. The display device of claim 2 , wherein the width of the second auxiliary insulating layer is smaller than a width of the light-emitting element,
the first auxiliary insulating layer is entirely overlapped by the second auxiliary insulating layer, and
the second auxiliary insulating layer is entirely overlapped by the light-emitting element.

4. The display device of claim 1 , wherein the first auxiliary insulating layer comprises SiOx, and the second auxiliary insulating layer comprises SiNx.

5. The display device of claim 1 , wherein, when measured in a thickness direction of the base layer, a distance separating the first insulating portion from the light-emitting element is substantially equal to a distance separating the second insulating portion and the light-emitting element.

6. The display device of claim 1 , wherein the connection electrode comprises:
a dummy connection electrode disposed on the second auxiliary insulating layer;
a first connection electrode connecting the first electrode and the light-emitting element; and
a second connection electrode connecting the second electrode and the light-emitting element, the first and second connection electrodes being spaced apart from each other,
wherein the dummy connection electrode is spaced apart from the first connection electrode and the second connection electrode.

7. The display device of claim 6 , wherein the first connection electrode and the second connection electrode are spaced apart from each other with the first auxiliary insulating layer being interposed therebetween, and
wherein the dummy connection electrode, the first connection electrode, and the second connection electrode comprise a same conductive material.

8. The display device of claim 6 , wherein, when measured in a thickness direction of the base layer, a distance separating the second auxiliary insulating layer and the first connection electrode disposed on the light-emitting element is substantially equal to a distance separating the second auxiliary insulating layer and the second connection electrode disposed on the light-emitting element.

9. The display device of claim 6 , wherein the dummy connection electrode covers at least three intersecting surfaces of the second auxiliary insulating layer.

10. The display device of claim 1 , wherein, the connection electrode overlaps the light-emitting element.

11. The display device of claim 1 , further comprising:
a first partition wall disposed between the first electrode and the insulating layer; and
a second partition wall disposed between the second electrode and the insulating layer,
wherein the light-emitting element is disposed between the first partition wall and the second partition wall.

12. The display device of claim 1 , wherein the first electrode comprises a first reflective electrode, which is electrically connected to the pixel circuit and includes a reflective material, and a first capping electrode, which covers the first reflective electrode, and
the second electrode comprises a second reflective electrode, which receives a power voltage and includes a reflective material, and a second capping electrode, which covers the second reflective electrode.

13. The display device of claim 1 , further comprising a third auxiliary insulating layer disposed on the light-emitting element and the insulating layer,
wherein a portion of the third auxiliary insulating layer is recessed in a thickness direction of the base layer.

14. The display device of claim 1 , wherein the connection electrode is disposed on the first electrode and the second electrode.

15. The display device of claim 1 , wherein the connection electrode is directly disposed on a top surface and a side surface of the light-emitting element.

16. A display device, comprising:
a base layer;
a pixel circuit disposed on the base layer;
an insulating layer disposed on the base layer to cover the pixel circuit;
a first electrode electrically connected to the pixel circuit and disposed on the insulating layer;
a second electrode electrically connected to the pixel circuit and disposed on the insulating layer, the second electrode being spaced apart from the first electrode in a first direction;
a light-emitting element disposed between the first electrode and the second electrode and electrically connected to the first electrode and the second electrode;
a first auxiliary insulating layer disposed on the light-emitting element;
a second auxiliary insulating layer made of a different material than the first auxiliary insulating layer, the second auxiliary insulating layer being disposed on the first auxiliary insulating layer such that the first auxiliary insulating layer is disposed between the second auxiliary insulating layer and the light-emitting element; and
a connection electrode comprising a dummy connection electrode disposed on the second auxiliary insulating layer, a first connection electrode connecting the first electrode and the light-emitting element, and a second connection electrode connecting the second electrode and the light-emitting element, the second connection electrode being spaced apart from the first connection electrode.

17. The display device of claim 14 , wherein the dummy connection electrode is spaced apart from the first connection electrode and the second connection electrode and is substantially disposed over the second auxiliary insulating layer, and
wherein the dummy connection electrode, the first connection electrode, and the second connection electrode comprise a same conductive material.

18. The display device of claim 14 , wherein a width of the first auxiliary insulating layer is smaller than a width of the second auxiliary insulating layer, and the width of the second auxiliary insulating layer is smaller than a width of the light-emitting element.

19. The display device of claim 16 , wherein t

Assignees

• Samsung Display Co Ltd

Inventors

• Bae Subin
• Cho Sungwon
• Jeong Yu-Gwang
• Kim Sanggab

Classifications

• H10W90/00

  Package configurations · CPC title

• H10H20/835

  Reflective materials · CPC title

• H10H20/01

  Manufacture or treatment · CPC title

• H10H29/142 Primary

  Two-dimensional arrangements, e.g. asymmetric LED layout · CPC title

• H10H20/0364

  of interconnections · CPC title