Organic light emitting display device

Patent metadata

Field	Value
Publication number	US-2016181562-A1
Application number	US-201514873414-A
Country	US
Kind code	A1
Filing date	Oct 2, 2015
Priority date	Dec 17, 2014
Publication date	Jun 23, 2016
Grant date	—

Abstract

An organic light emitting display device comprises two emission portions between first and second electrodes, wherein at least one among the two emission portions includes two emitting layers, whereby efficiency and a color reproduction ratio may be improved.

First claim

What is claimed is:

1 . An organic light emitting display device, comprising:
first and second electrodes facing each other on a substrate; a first emission portion on the first electrode; and a second emission portion on the first emission portion, wherein the first emission portion or the second emission portion includes one among a green emitting layer and a yellow-green emitting layer and a red emitting layer to improve any one among green efficiency, red efficiency, and a color shift rate property.

2 . The organic light emitting display device of claim 1 , wherein the first emission portion includes the green emitting layer and the red emitting layer.

3 . The organic light emitting display device of claim 2 , wherein the second emission portion includes a dark blue emitting layer.

4 . The organic light emitting display device of claim 2 , wherein the green emitting layer is closer to the first electrode than the red emitting layer.

5 . The organic light emitting display device of claim 4 , further comprising organic layers between the first electrode and the second electrode, wherein the organic layers have a thickness in the range of 200 nm to 230 nm to improve red efficiency.

6 . The organic light emitting display device of claim 4 , further comprising organic layers between the first electrode and the second electrode, wherein the organic layers have a thickness in the range of 320 nm to 350 nm to improve the color shift rate property.

7 . The organic light emitting display device of claim 2 , wherein the red emitting layer is closer to the first electrode than the green emitting layer.

8 . The organic light emitting display device of claim 7 , further comprising organic layers between the first electrode and the second electrode, wherein the organic layers have a thickness in the range of 200 nm to 230 nm to improve green efficiency.

9 . The organic light emitting display device of claim 1 , wherein the second emission portion includes the green emitting layer and the red emitting layer.

10 . The organic light emitting display device of claim 9 , wherein the red emitting layer is closer to the second electrode than the green emitting layer.

11 . The organic light emitting display device of claim 9 , wherein the first emission portion includes a dark blue emitting layer.

12 . The organic light emitting display device of claim 9 , further comprising organic layers between the first electrode and the second electrode, wherein the organic layers have a thickness in the range of 320 nm to 350 nm to improve green efficiency.

13 . The organic light emitting display device of claim 1 , wherein the first emission portion includes the yellow-green emitting layer and the red emitting layer.

14 . The organic light emitting display device of claim 13 , wherein the second emission portion includes a blue emitting layer.

15 . The organic light emitting display device of claim 13 , wherein the yellow-green emitting layer is closer to the first electrode than the red emitting layer.

16 . The organic light emitting display device of claim 13 , further comprising organic layers between the first electrode and the second electrode, wherein the organic layers have a thickness in the range of 200 nm to 240 nm to improve red efficiency.

17 . The organic light emitting display device of claim 13 , further comprising organic layers between the first electrode and the second electrode, wherein the organic layers have a thickness in the range of 340 nm to 370 nm to improve the color shift rate property.

18 . The organic light emitting display device of claim 1 , wherein each of the first electrode and the second electrode includes one among reflective electrode and transflective electrode.

19 . The organic light emitting display device of claim 1 , wherein each of the first emission portion and the second emission portion includes electroluminescence (EL) peaks in the ranges of 440 nm to 480 nm, 530 nm to 580 nm, and 600 nm to 650 nm.

20 . An organic light emitting display device, comprising:
first and second electrodes facing each other on a substrate; a first emission portion on the first electrode; and a second emission portion on the first emission portion, wherein at least one among the first emission portion and the second emission portion includes two emitting layers, and the first emission portion and the second emission portion have emission characteristics that exhibit three EL peaks.

21 . The organic light emitting display device of claim 20 , wherein the first emission portion includes the two emitting layers, and the second emission portion includes a single emitting layer.

22 . The organic light emitting display device of claim 21 , wherein the two emitting layers in the first emission portion includes a green emitting layer and a red emitting layer, and the single emitting layer in the second emission portion includes a dark blue emitting layer.

23 . The organic light emitting display device of claim 21 , wherein the two emitting layers in the first emission portion include a yellow-green emitting layer and a red emitting layer, and the single emitting layer in the second emission portion includes a blue emitting layer.

24 . The organic light emitting display device of claim 20 , wherein the first emission portion includes a single emitting layer, and the second emission portion includes two emitting layers.

25 . The organic light emitting display device of claim 24 , wherein the single emitting layer in the first emission portion includes a dark blue emitting layer, and the two emitting layers in the second emission portion include a green emitting layer and a red emitting layer.

26 . The organic light emitting display device of claim 20 , wherein each of the first electrode and the second electrode includes one among a reflective electrode and transflective electrode.

27 . The organic light emitting display device of claim 20 , wherein the three EL peaks have wavelengths in the ranges of 440 nm to 480 nm, 530 nm to 580 nm, and 600 nm to 650 nm.

Assignees

• Lg Display Co Ltd

Inventors

• Pieh Sung Hoon
• Han Chang Wook
• Choi Hong Seok
• Song Ki-Woog
• Ahn So Yeon
• Kim Seung Hyun

Classifications

• H10K59/12 Primary

  Active-matrix OLED [AMOLED] displays · CPC title

• H10K59/80524

  Transparent cathodes, e.g. comprising thin metal layers · CPC title

• H10K50/13

  comprising stacked EL layers within one EL unit · CPC title

• H10K59/32 Primary

  Stacked devices having two or more layers, each emitting at different wavelengths · CPC title

• H01L2251/558

  Electricity · mapped topic