Organic light emitting display apparatus

Patent metadata

Field	Value
Publication number	US-10115924-B2
Application number	US-201615221434-A
Country	US
Kind code	B2
Filing date	Jul 27, 2016
Priority date	Sep 18, 2015
Publication date	Oct 30, 2018
Grant date	Oct 30, 2018

Abstract

An OLED apparatus that may include a reflection-anode, a transparent-cathode, and a plurality of stacks between the reflection-anode and the transparent-cathode, wherein, among the plurality of stacks, a thickness of the stack disposed relatively close to the transparent-cathode is larger than a thickness of the stack disposed relatively close to the reflection-anode so that it is possible to optimize a micro-cavity of light emitted from the plurality of stacks, thereby improving a light-emission efficiency and a color reproduction ratio and reducing a color change rate in accordance with a viewing angle.

First claim

What is claimed is:

1. An organic light emitting display (OLED) apparatus comprising:
a reflection-anode;
a transparent layer directly on the reflection-anode;
a first stack directly on the transparent layer, wherein the first stack includes an electron transport layer and at least one organic layer having light-emitting dopant of an arylamine-based compound for emitting blue light;
a first charge generation layer on the first stack, wherein the first charge generation layer includes a first N-type charge generation layer doped with alkali-based metal, and a first P-type charge generation layer;
a second stack on the first charge generation layer, wherein the second stack includes at least one organic layer having light-emitting dopant of an iridium-based compound for yellow-green light;
a second charge generation layer on the second stack, wherein the second charge generation layer includes a second N-type charge generation layer doped with alkali-based metal, and a second P-type charge generation layer;
a third stack on the second charge generation layer, wherein the third stack includes at least one organic layer having light-emitting dopant of the arylamine-based compound for emitting blue light; and
a transparent-cathode on the third stack;
wherein, T 1 indicates a distance from a lower surface of the transparent layer to an interface between the first N-type charge generation layer and the first P-type charge generation layer, T 2 indicates a distance from the interface between the first N-type charge generation layer and the first P-type charge generation layer to an interface between the second N-type charge generation layer and the second P-type charge generation layer, and T 3 indicates a distance from the interface between the second N-type charge generation layer and the second P-type charge generation layer to an upper surface of the transparent-cathode, the T 1 , T 2 and T 3 satisfy a thickness ratio of T 1 :T 2 :T 3 =16%:36%:48%,
wherein the light emitting device has a color reproduction ratio of 99% or more than 99%, and a color change value (Δu′v′) of 0.05 or less than 0.05 within a viewing angle range from 0° to 60°.

2. The OLED apparatus according to claim 1 , wherein a peak wavelength of light emitted from the first stack is within a range from 440 nm to 480 nm, a peak wavelength of light emitted from the second stack is within a range from 540 nm to 580 nm, and a a peak wavelength of light emitted from the third stack is within a range from 440 nm to 480 nm.

3. The OLED apparatus according to claim 1 , wherein at least one among the first stack, the second stack and the third stack includes an auxiliary emission layer, and the auxiliary emission layer includes a light-emitting dopant for emitting light.

4. The OLED apparatus according to claim 1 , wherein at least one of among the first stack, the second stack and the third stack includes at least one among a hole injecting layer (HIL), a hole transporting layer (HTL), an electron transporting layer (ETL), an electron injecting layer (EIL), a hole blocking layer (HBL), an electron blocking layer (EBL).

5. The OLED apparatus according to claim 1 , wherein light emitted from at least one among the first stack, the second stack and the third stack passes through the transparent-cathode.

Assignees

• Lg Display Co Ltd

Inventors

• Kum Taell
• Song Ki-Woog
• Ahn Soyeon
• Choi Yongjoong
• Lee Mingyu

Classifications

• H01L51/504 Primary

  Electricity · mapped topic

• H01L2251/558

  Electricity · mapped topic

• H01L51/5265

  Electricity · mapped topic

• H01L51/5278

  Electricity · mapped topic

• H01L2251/5315

  Electricity · mapped topic