Electroluminescent display device

Patent metadata

Field	Value
Publication number	US-11024685-B2
Application number	US-201816213238-A
Country	US
Kind code	B2
Filing date	Dec 7, 2018
Priority date	Dec 11, 2017
Publication date	Jun 1, 2021
Grant date	Jun 1, 2021

Abstract

An electroluminescent display device includes a substrate including a plurality of pixel regions; an air gap over the substrate and configured to separate the plurality of pixel regions; a first electrode in each of the plurality of pixel regions; an insulating pattern covering an edge of the first electrode; a light emitting portion on the first electrode and the insulating pattern; and a second electrode on the light emitting portion.

First claim

What is claimed is:

1. An electroluminescent display device, comprising:
a substrate;
a plurality of pixel regions on the substrate;
an air gap over the substrate and configured to separate the plurality of pixel regions;
a first electrode in each of the plurality of pixel regions;
a light emitting portion in each of the plurality of pixel regions and on the first electrode; and
a second electrode on the light emitting portion,
wherein the light emitting portion includes a first light-emitting layer, a carrier generation layer, and a second light-emitting layer which are sequentially stacked, and
wherein the carrier generation layer of each of the plurality of pixel regions is separated by the air gap.

2. The electroluminescent display device of claim 1 , wherein the first light-emitting layer and the carrier generation layer of each of the plurality of pixel regions are completely separated by the air gap.

3. The electroluminescent display device of claim 1 , wherein:
the first electrode, the first light-emitting layer, and the carrier generation layer of each of the plurality of pixel regions are separated; and
the second light-emitting layer and the second electrode of each of the plurality of pixel regions are connected.

4. The electroluminescent display device of claim 1 , wherein at least one portion of the light emitting portion in a direction perpendicular to the substrate is disposed separately due to the air gap.

5. The electroluminescent display device of claim 1 , wherein the carrier generation layer is disposed separately in each of the plurality of pixel regions spaced apart by the air gap.

6. The electroluminescent display device of claim 1 , further comprising:
an insulating pattern covering an edge of the first electrode,
wherein the light emitting portion is further disposed on the first electrode and the insulating pattern.

7. The electroluminescent display device of claim 6 , wherein the light emitting portion is formed on a surface of the insulating pattern facing each other at one air gap.

8. The electroluminescent display device of claim 6 , wherein the insulating pattern is disposed separately in each of the plurality of pixel regions spaced apart by the air gap.

9. The electroluminescent display device of claim 7 , wherein:
the air gap includes a first portion contacting the insulating pattern and a second portion contacting the second light-emitting layer; and
a width of the second portion is decreased toward an upper portion of the second portion.

10. The electroluminescent display device of claim 9 , wherein a width of the first portion of the air gap is constant.

11. The electroluminescent display device of claim 9 , wherein:
the second light-emitting layer includes a protrusion; and
the protrusion covers an upper portion of the air gap, is formed on entire surfaces of the plurality of pixel regions, and is formed to correspond to each of boundaries of the plurality of pixel regions.

12. The electroluminescent display device of claim 11 , further comprising a first encapsulation layer on the second electrode.

13. The electroluminescent display device of claim 12 , wherein the second electrode and the first encapsulation layer follow a morphology of the second light-emitting layer including the protrusion.

14. The electroluminescent display device of claim 13 , further comprising:
a second encapsulation layer having a flat upper surface and on the first encapsulation layer; and
a color filter layer on the second encapsulation layer.

15. The electroluminescent display device of claim 1 , further comprising:
a passivation layer between the substrate and the first electrode; and
an interlayer insulating layer between the substrate and the passivation layer,
wherein each of the passivation layer and the interlayer insulating layer is disposed separately in each of the plurality of pixel regions spaced apart by the air gap.

16. The electroluminescent display device of claim 1 , wherein the first light-emitting layer has a concave shape.

17. The electroluminescent display device of claim 1 , wherein the second light-emitting layer has a concave shape.

18. The electroluminescent display device of claim 1 , wherein the second electrode has a concave shape.

19. The electroluminescent display device of claim 14 , wherein:
the color filter layer includes color filter patterns corresponding to each of the plurality of pixel regions; and
there is no black matrix between the color filter patterns.

20. The electroluminescent display device of claim 6 , wherein a path of light, which is obliquely output from the light-emitting portion of each of the plurality of pixel regions, is changed in a direction perpendicular to the substrate by the insulating pattern and the air gap.

Assignees

• Lg Display Co Ltd

Inventors

• Lim Hyeong-Jun
• Park Ji-Yeon
• Park Han-Sun

Classifications

• H10W10/021 Primary

  of air gaps · CPC title

• H10W10/20 Primary

  Air gaps · CPC title

• H10K59/879

  comprising refractive means, e.g. lenses · CPC title

• H10K59/873

  Encapsulations · CPC title

• H10K59/8723

  Vertical spacers, e.g. arranged between the sealing arrangement and the OLED · CPC title