Organic light emitting display device

Patent metadata

Field	Value
Publication number	US-11049919-B2
Application number	US-202016802386-A
Country	US
Kind code	B2
Filing date	Feb 26, 2020
Priority date	Sep 23, 2015
Publication date	Jun 29, 2021
Grant date	Jun 29, 2021

Abstract

An organic light emitting display device includes an overcoating layer on a substrate; a first electrode on the overcoating layer; a bank layer on the overcoating layer and the first electrode, the bank layer including an opening through which the first electrode is exposed; a pattern layer having an island shape on the exposed portion of the first electrode; an organic emission layer on the first electrode and the pattern layer; and a second electrode on the organic emission layer.

First claim

What is claimed is:

1. An organic light emitting display device, comprising:
a substrate;
a thin film transistor on the substrate;
a passivation layer on the thin film transistor;
an overcoating layer on the passivation layer;
a color filter between the passivation layer and the overcoating layer;
a first electrode on the overcoating layer, the first electrode being electrically connected to the thin film transistor;
an organic emission layer on the first electrode; and
a second electrode on the organic emission layer,
wherein the overcoating layer includes a plurality of concave portions between the color filter and the first electrode.

2. The organic light emitting display device according to claim 1 , wherein:
the overcoating layer further includes a connection portion between the plurality of concave portions; and
at least one of the connection portion and the concave portions is configured to have a hexagonal shape in a plan view.

3. The organic light emitting display device according to claim 1 , wherein:
the overcoating layer further includes a connection portion between the plurality of concave portions; and
the connection portion is a higher portion between the concave portions adjacent to each other.

4. The organic light emitting display device according to claim 1 , wherein the plurality of concave portions is configured to have a hexagonal honeycomb structure in a plan view.

5. The organic light emitting display device according to claim 1 , wherein:
the overcoating layer further includes an opening to expose a portion of the color filter; and
the first electrode includes a plurality of concave portions contacted with the color filter through the opening of the overcoating layer.

6. The organic light emitting display device according to claim 5 , further comprising a pattern layer interposed between each of the plurality of concave portions of the first electrode and the organic emission layer.

7. The organic light emitting display device according to claim 6 , wherein:
the pattern layer is filled in each of the concave portions of the first electrode by more than half;
the pattern layer has an island shape; or
a lower surface of the pattern layer has a curved surface shape, and an upper surface of the pattern layer has a flat surface shape; or
an upper surface of the pattern layer in contact with the organic emission layer is planar.

8. The organic light emitting display device according to claim 1 , further comprising:
a pattern layer interposed between each of the plurality of concave portions of the first electrode and the organic emission layer; and
an emission area overlapping with the color filter,
wherein the overcoating layer further includes a connection portion between the plurality of concave portions, and
wherein the emission area includes:
an effective emission area overlapping with the connection portion and configured to have a convex surface shape, and
a non-effective emission area overlapping with the pattern layer and configured to have a flat surface shape.

9. The organic light emitting display device according to claim 1 , further comprising:
a bank layer disposed on the overcoating layer and the first electrode, the bank layer including an opening through which the first electrode is exposed; and
a pattern layer interposed between the first electrode and the organic emission layer overlapping with each of the plurality of concave portions,
wherein the pattern layer includes a same material as the bank layer, or
wherein a thickness of the pattern layer is thinner rather than a thickness the bank layer.

10. The organic light emitting display device according to claim 1 , wherein the plurality of concave portions are arranged in honeycomb structure in a plane view.

11. An organic light emitting display device, comprising:
a substrate; and
a plurality of pixels disposed on the substrate,
wherein each of the plurality of pixels includes:
a thin film transistor on the substrate;
a passivation layer on the thin film transistor;
a color filter on the passivation layer;
an overcoating layer on the passivation layer and the color filter, the overcoating layer including a plurality of concave portions on the color filter; and
an organic light emitting diode on the overcoating layer.

12. The organic light emitting display device according to claim 11 , wherein:
the each of the plurality of pixels includes an emission area on the color filter; and
the emission area includes:
an effective emission area on each of the plurality of concave portions, the effective emission area being configured to have a convex surface shape; and
a non-effective emission area disposed between the effective emission areas, the non-effective emission area being configured to have a flat surface shape.

13. The organic light emitting display device according to claim 11 , wherein:
the overcoating layer further includes a connection portion between the plurality of concave portions; and
at least one of the connection portion and the concave portions is configured to have a hexagonal shape; or
the plurality of concave portions is configured to have a hexagonal honeycomb structure in a plan view.

14. The organic light emitting display device according to claim 11 , wherein:
the overcoating layer further includes a connection portion between the plurality of concave portions; and
the connection portion is a higher portion between the concave portions adjacent to each other.

15. The organic light emitting display device according to claim 12 , wherein:
the organic light emitting diode includes an organic emission layer; and
in the emission area, a surface morphology of the organic emission layer differs from a surface morphology of the overcoating layer.

16. The organic light emitting display device according to claim 15 , wherein:
the organic light emitting diode further includes a first electrode interposed between the overcoating layer and the organic emission layer, the first electrode being electrically connected to the thin film transistor;
the overcoating layer further includes an opening to expose a portion of the color filter overlapping with the non-effective emission area; and
the first electrode includes a plurality of concave portions contacted with the color filter through the opening of the overcoating layer.

17. The organic light emitting display device according to claim 15 , wherein the organic light emitting diode includes a pattern layer on the non-effective emission area.

18. The organic light emitting display device according to claim 17 , wherein:
the pattern layer has an island shape; or
a lower surface of the pattern layer has a curved surface shape, and an upper surface of the pattern layer has a flat surface shape; or an upper surface of the pattern layer in contact with the organic emission layer is planar.

19. The organic light emitting display device according to claim 17 , wherein:
the organic light emitting diode further includes a first electrode interposed between the overcoating layer and the organic emission layer, the first electrode being electrically connected to the thin film transistor;
the pattern layer is interposed between the first electrode and the organic emission layer overlapping each of the plurality of concave portions in the emission area; and
a surface morphology of the organic emission layer differs from a surface morphology of the first electrode.

20. The organic light emi

Assignees

• Lg Display Co Ltd

Inventors

• Jang Jihyang
• Kim Sookang
• Jo Soyoung
• Koo Wonhoe
• Lim Hyunsoo
• Choi Mingeun

Classifications

• H10K59/879

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

• H10K59/875

  Arrangements for extracting light from the devices · CPC title

• H10K59/80521

  characterised by their shape · CPC title

• H10K59/80515

  characterised by their shape · CPC title

• H10K59/122 Primary

  Pixel-defining structures or layers, e.g. banks · CPC title