Organic light emitting diode display and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-9257674-B2
Application number	US-201113297133-A
Country	US
Kind code	B2
Filing date	Nov 15, 2011
Priority date	Apr 5, 2011
Publication date	Feb 9, 2016
Grant date	Feb 9, 2016

Abstract

An OLED display includes: a substrate; an organic light emitting element formed on the substrate and including a first electrode, an emission layer, and a second electrode; and an encapsulation layer formed on the substrate while covering the organic light emitting element. The encapsulation layer includes an organic layer and an inorganic layer, and a protrusion and depression structure is formed in an interface between the organic layer and the inorganic layer.

First claim

What is claimed is:

1. An organic light emitting diode (OLED) display comprising:
a substrate;
an organic light emitting element on the substrate and comprising a first electrode, an emission layer, and a second electrode; and
an encapsulation layer on the substrate while covering the organic light emitting element,
wherein the encapsulation layer comprises alternately stacked organic layers and inorganic layers,
wherein a protrusion and depression structure, with an irregular pattern, is formed in interfaces between the organic layers and the inorganic layers,
wherein the protrusion and depression structure has a root mean square (RMS) roughness in a range between 30 Å to 1000 Å,
wherein each of the organic layers has a refractive index between 1.2 and 2.0,
wherein each of the inorganic layers has a refractive index between 1.3 and 2.2,
wherein the protrusion and depression structure is formed in a surface of the organic layer,
wherein the inorganic layer is formed on the organic layer, and
wherein the protrusion and depression structure consists of the same material as the organic layer.

2. The OLED display of claim 1 , wherein a surface roughness of the protrusion and depression structure has a maximum height (Rmax) in a range between 50 Å to 200 nm.

3. The OLED display of claim 1 , wherein a surface roughness of the protrusion and depression structure has a maximum height (Rmax) in a range between 50 Å to 200 nm.

4. The OLED display of claim 1 , wherein the organic layer and the inorganic layer are respectively provided in plural, and the protrusion and depression structure is formed at each interface where the inorganic layer is layered on the organic layer.

5. The OLED display of claim 1 , wherein the organic layer comprises at least one material selected from a group consisting of a carbide-based material, a carbonate-based material, an acryl-based resin, a methacryl-based resin, polyisoprene, a vinyl-based resin, an epoxy-based resin, a urethane-based resin, a cellulous-based resin, and a perylene-based resin.

6. The OLED display of claim 1 , wherein the inorganic layer comprises at least one material selected from a group consisting of silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, titanium oxide, tin oxide, cerium oxide, and silicon oxynitride.

7. The OLED display of claim 1 , wherein a refractive index difference between the organic layer and the inorganic layer is higher than 0.1.

Assignees

• Lee So-Young
• Cho Yoon-Hyeung
• Oh Min-Ho
• Lee Byoung-Duk
• Kim Yong-Tak
• Cho Sang-Hwan
• Chung Yun-Ah
• Song Seung-Yong
• Lee Jong-Hyuk
• Samsung Display Co Ltd

Inventors

• Lee So-Young
• Cho Yoon-Hyeung
• Oh Min-Ho
• Lee Byoung-Duk
• Kim Yong-Tak
• Cho Sang-Hwan
• Chung Yun-Ah
• Song Seung-Yong
• Lee Jong-Hyuk

Classifications

• H10K2102/302

  of OLED structures · CPC title

• H10K71/00

  Manufacture or treatment specially adapted for the organic devices covered by this subclass · CPC title

• H10K59/805

  Electrodes · CPC title

• H10K59/877 Primary

  comprising scattering means · CPC title

• H10K59/8731 Primary

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