Organic light emitting display apparatus reducing reflection of external light

Patent metadata

Field	Value
Publication number	US-9692018-B2
Application number	US-201514699258-A
Country	US
Kind code	B2
Filing date	Apr 29, 2015
Priority date	Sep 11, 2014
Publication date	Jun 27, 2017
Grant date	Jun 27, 2017

Abstract

An organic light emitting display apparatus includes: a substrate divided into an emission area and a non-emission area; a pixel electrode disposed in the emission area; an intermediate layer disposed on the pixel electrode, including an organic emission layer; a counter electrode covering the intermediate layer; an external light reflection layer disposed on the counter electrode, the external light reflection layer being configured to reflect a portion of incident visible rays; and absorb and transmit another portion of the incident visible rays; a phase control layer disposed between the counter electrode and the external light reflection layer, being configured to control a phase of a light reflected by the counter electrode to destructive interfere with light reflected by the external light reflection layer; a thin-film encapsulating layer disposed on the external light reflection layer; and a black matrix disposed on the thin-film encapsulating layer in the non-emission area.

First claim

What is claimed is:

1. An organic light emitting display apparatus comprising:
a substrate divided into an emission area and a non-emission area;
a pixel electrode disposed in the emission area;
an intermediate layer disposed on the pixel electrode, the intermediate layer comprising an organic emission layer;
a counter electrode disposed in the emission area and the non-emission area, the counter electrode covering the intermediate layer;
an external light reflection layer disposed on the counter electrode in the emission area and the non-emission area, the external light reflection layer being configured to:
reflect a portion of incident visible rays; and
absorb and transmit another portion of the incident visible rays;

a phase control layer disposed between the counter electrode and the external light reflection layer, the phase control layer being configured to control a phase of light reflected by the counter electrode to destructively interfere with light reflected by the external light reflection layer;
a thin-film encapsulating layer disposed on the external light reflection layer; and
a black matrix disposed on the thin-film encapsulating layer in the non-emission area.

2. The organic light emitting display apparatus of claim 1 , wherein:
the black matrix is partially disposed over the phase control layer and the external light reflection layer; and
the black matrix is about 0.01 μm to about 3 μm thick.

3. The organic light emitting display apparatus of claim 2 , wherein the external light reflection layer is less than or equal to 0.01 μm thick.

4. The organic light emitting display apparatus of claim 2 , wherein:
the thin-film encapsulating layer comprises an inorganic layer and an organic layer; and
a maximum thickness of the thin-film encapsulating layer is about 2 μm to about 20 μm.

5. The organic light emitting display apparatus of claim 1 , wherein a product of an index of refraction of the external light reflection layer and an extinction coefficient of the external light reflection layer is equal to or greater than 1.

6. The organic light emitting display apparatus of claim 5 , wherein:
the external light reflection layer comprises at least one of chrome (Cr), molybdenum (Mo), titanium (Ti), cobalt (Co), nickel (Ni), aluminum (Al), tungsten (W), CrN x , TiN x , TiAIN x , MoO x , and CuO x , “x” being an integer greater than or equal to 1.

7. The organic light emitting display apparatus of claim 1 , wherein the phase control layer comprises at least one of SiN x , SiO 2 , SiCN, LiF, MgF 2 , CaF 2 , SiON, Ta x O y , and TiO x , “x” being an integer greater than or equal to 1.

8. The organic light emitting display apparatus of claim 1 , further comprising:
a protection layer disposed between the phase control layer and the external light reflection layer.

9. The organic light emitting display apparatus of claim 8 , wherein the protection layer comprises at least one of LiF, MoO x , WoO x , and SiN x , “x” being an integer greater than or equal to 1.

10. The organic light emitting display apparatus of claim 1 , further comprising:
an interface reflection reducing layer disposed between the external light reflection layer and the thin-film encapsulating layer.

11. The organic light emitting display apparatus of claim 1 , further comprising:
a touch layer disposed between the thin-film encapsulating layer and the black matrix.

12. The organic light emitting display apparatus of claim 1 , wherein:
the counter electrode is semi-transparent; and
a product of an index of refraction of the counter electrode and an extinction coefficient of the counter electrode is less than or equal to 10.

13. The organic light emitting display apparatus of claim 1 , wherein a micro cavity structure is disposed between the pixel electrode and the counter electrode.

14. The organic light emitting display apparatus of claim 13 , wherein the micro cavity is configured to:
amplify incident light of a determined wavelength; and
emit the amplified light toward the counter electrode.

15. The organic light emitting display apparatus of claim 11 , wherein the touch layer comprises a conductive material.

16. The organic light emitting display apparatus of claim 15 , wherein the touch layer is disposed directly on the thin-film encapsulating layer.

Assignees

• Samsung Display Co Ltd

Inventors

• Cho Sanghwan
• Choi Chungsock
• Kim Seunghun
• Jang Cheol

Classifications

• H10K2102/351

  Thickness · CPC title

• H10K2102/311

  Flexible OLED · CPC title

• H10K59/40

  OLEDs integrated with touch screens · CPC title

• H10K50/8445

  multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers · CPC title

• H10K59/8731 Primary

  multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers · CPC title