Organic light emitting diode display device

Patent metadata

Field	Value
Publication number	US-10079365-B2
Application number	US-201615252030-A
Country	US
Kind code	B2
Filing date	Aug 30, 2016
Priority date	Aug 31, 2015
Publication date	Sep 18, 2018
Grant date	Sep 18, 2018

Abstract

An organic light emitting diode display device is provided. The organic light emitting diode display device includes a first insulating layer disposed on a substrate and having a first refractive index, a refraction inducing layer disposed on the first insulating layer having a second refractive index, a second insulating layer disposed on the refraction inducing layer and having a third refractive index, a first electrode disposed on the second insulating layer and having a fourth refractive index, and an organic light emitting layer and a second electrode disposed on the first electrode. The second insulating layer, the first electrode, the organic light emitting layer, and the second electrode include a plurality of convex parts and a plurality of concave parts.

First claim

What is claimed is:

1. An organic light emitting diode display device having an emission area and a non-emission area, comprising:
a substrate including a plurality of sub pixels;
a first insulating layer disposed on the substrate;
a refraction inducing layer formed only of an inorganic material disposed on the first insulating layer;
a second insulating layer disposed on the refraction inducing layer; and
a first electrode, an organic light emitting layer, and a second electrode of an organic light emitting diode disposed on the second insulating layer,
wherein the second insulating layer, the first electrode, the organic light emitting layer, and the second electrode include a plurality of micro lenses having a plurality of concave parts and a plurality of convex parts.

2. The organic light emitting diode display device according to claim 1 , wherein a refractive index of the first electrode is higher than a refractive index of the second insulating layer.

3. The organic light emitting diode display device according to claim 1 , wherein a refractive index of the second insulating layer is lower than a refractive index of the refraction inducing layer.

4. The organic light emitting diode display device according to claim 1 , wherein a refractive index of the refractive inducing layer is higher than a refractive index of the first insulating layer.

5. The organic light emitting diode display device according to claim 1 , wherein a refractive index of the first insulating layer is equal to a refractive index of the second insulating layer.

6. The organic light emitting diode display device according to claim 1 , wherein a refractive index of the refraction inducing layer is equal to a refractive index of the first electrode.

7. The organic light emitting diode display device according to claim 1 , wherein refractive indexes of the refraction inducing layer and the first electrode are 1.7 to 2.0.

8. The organic light emitting diode display device according to claim 1 , wherein the refraction inducing layer and the first electrode are formed by the same material.

9. The organic light emitting diode display device according to claim 1 , wherein the refraction inducing layer is any one of indium tin oxide (ITO), indium zinc oxide (IZO), and silicon nitride SiNx.

10. The organic light emitting diode display device according to claim 1 , wherein the refraction inducing layer is formed of a plurality of layers having different refractive indexes.

11. The organic light emitting diode display device according to claim 10 , wherein a refractive index of the refraction inducing layer, which is formed of a plurality of layers, increases as the layer is closer to the second insulating layer.

12. The organic light emitting diode display device according to claim 1 , wherein in the plurality of sub pixels, a maximum width of a concave part or a convex part of a micro lens disposed in at least one sub pixel is smaller than a maximum width of a concave part or a convex part of a micro lens disposed in another sub pixel.

13. The organic light emitting diode display device according to claim 1 , wherein in the plurality of sub pixels, a maximum width of a concave part or a convex part of at least one of the plurality of micro lenses disposed in a sub pixel having lower emission efficiency, is smaller than a maximum width of a concave part or a convex part of at least one of the plurality of micro lenses disposed in a sub pixel having higher emission efficiency.

14. The organic light emitting diode display device according to claim 1 , wherein an upper portion and a side portion of each of the plurality of micro lenses is in contact with the first electrode, and
a lower portion of each of the plurality of micro lenses is in contact with the refraction inducing layer.

15. The organic light emitting diode display device according to claim 1 , wherein the plurality of micro lenses are spaced apart from each other.

16. The organic light emitting diode display device according to claim 1 , wherein the plurality of micro lenses is disposed to expose a part of the refraction inducing layer.

17. The organic light emitting diode display device according to claim 1 , wherein when an incident angle of light incident on the second insulating layer is larger than a critical angle of total reflection, and
the light is incident on the second insulating layer at least once after an initial incidence via the refraction inducing layer.

18. The organic light emitting diode display device according to claim 1 , wherein the refraction inducing layer is disposed on an emission area.

19. The organic light emitting diode display device according to claim 1 , wherein a bank pattern is disposed on the first insulating layer.

20. An organic light emitting diode display device, comprising:
a substrate including a plurality of sub pixels;
a first insulating layer disposed on the substrate;
a refraction inducing layer formed only of an inorganic material disposed on the first insulating layer;
a second insulating layer disposed on the refraction inducing layer; and
a first electrode, an organic light emitting layer, and a second electrode of an organic light emitting diode disposed on the second insulating layer,
wherein the organic light emitting diode comprises a plurality of concave parts and a plurality of convex parts, and
wherein a refractive index of the first insulating layer is equal to a refractive index of the second insulating layer, and a refractive index of the refraction inducing layer is equal to a refractive index of the first electrode.

21. The organic light emitting diode display device according to claim 20 , wherein the refractive index of the refraction inducing layer and the first electrode is higher than the refractive index of the first insulating layer and the second insulating layer.

Assignees

• Lg Display Co Ltd

Inventors

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

Classifications

• H01L51/5275 Primary

  Electricity · mapped topic

• H01L27/3258

  Electricity · mapped topic

• H01L27/3246

  Electricity · mapped topic

• H01L27/326

  Electricity · mapped topic

• H01L27/3248

  Electricity · mapped topic