Organic light emitting display device

Patent metadata

Field	Value
Publication number	US-10199594-B2
Application number	US-201615361282-A
Country	US
Kind code	B2
Filing date	Nov 25, 2016
Priority date	Nov 30, 2015
Publication date	Feb 5, 2019
Grant date	Feb 5, 2019

Abstract

An organic light emitting display device according to an embodiment includes: a first anode electrode, a second anode electrode, and a third anode electrode, each anode electrode being spaced apart from each other; a bank disposed on edges of the first to third anode electrodes; a third hole transporting layer disposed on the first to third anode electrodes and the bank, and having a third hole mobility; a first hole transporting layer disposed on the third hole transporting layer and having a first hole mobility higher than the third hole mobility; and a second hole transporting layer disposed next to the first hole transporting layer on the third hole transporting layer and having a second hole mobility higher than the third hole mobility.

First claim

What is claimed is:

1. An organic light emitting display device comprising:
a first anode electrode, a second anode electrode, and a third anode electrode, each anode electrode being laterally spaced apart from each other;
a third hole transporting layer disposed on the first anode electrode, the second anode electrode, and the third anode electrode, and having a third hole mobility;
a first hole transporting layer disposed on the third hole transporting layer and having a first hole mobility; and
a second hole transporting layer disposed next to the first hole transporting layer on the third hole transporting layer and having a second hole mobility,
wherein a thickness of the third hole transporting layer is greater than a thickness of the first hole transporting layer, and
wherein the third hole mobility of the third hole transporting layer is lower than the first hole mobility of the first hole transporting layer and the second hole mobility of the second hole transporting layer to reduce a lateral current between the first, second and third hole transporting layers.

2. The organic light emitting display device according to claim 1 , wherein the first hole transporting layer is disposed on the first anode electrode, and the second hole transporting layer is disposed on the second anode electrode.

3. The organic light emitting display device according to claim 2 , wherein the first hole transporting layer and the second hole transporting layer are disposed not to be overlapped with each other.

4. The organic light emitting display device according to claim 2 , further comprising:
a red organic emission layer disposed on the first anode electrode and the first hole transporting layer;
a green organic emission layer overlapped with the second anode electrode and disposed on the second hole transporting layer; and
a blue organic emission layer overlapped with the third anode electrode and disposed on the third hole transporting layer.

5. The organic light emitting display device according to claim 4 , wherein the third hole mobility is higher than hole mobilities of the red organic emission layer, the green organic emission layer, and the blue organic emission layer.

6. The organic light emitting display device according to claim 4 , further comprising:
an electron transporting layer disposed on the red organic emission layer, the green organic emission layer, and the blue organic emission layer, respectively.

7. The organic light emitting display device according to claim 6 , further comprising:
a translucent cathode electrode disposed on the electron transporting layer; and
a capping layer disposed on the translucent cathode electrode.

8. The organic light emitting display device according to claim 6 , wherein the third hole mobility is higher than a hole mobility of the electron transporting layer.

9. The organic light emitting display device according to claim 1 , wherein the third hole mobility of the third hole transporting layer is in the range of 10 −10 (m 2 V −1 s −1 ) to 10 −3 (m 2 V −1 s −1 ).

10. The organic light emitting display device according to claim 1 , wherein the thickness of the first hole transporting layer is greater than a thickness of the second hole transporting layer.

11. The organic light emitting display device according to claim 1 , wherein the thickness of the third hole transporting layer is in the range of 500 Å to 1500 Å.

12. The organic light emitting display device according to claim 11 , wherein a sum of the thicknesses of the first hole transporting layer and the third hole transporting layer disposed on the first anode electrode is 3500 Å or less.

13. The organic light emitting display device according to claim 7 , wherein a distance between a top surface of the first anode electrode and a bottom surface of the translucent cathode electrode is a first optical distance,
a distance between a top surface of the second anode electrode and the bottom surface of the translucent cathode electrode is a second optical distance, and
a distance between a top surface of the third anode electrode and the bottom surface of the translucent cathode electrode is a third optical distance.

14. The organic light emitting display device according to claim 1 , further comprising:
a bank disposed on edges of the first anode electrode, the second anode electrode, and the third anode electrode.

15. The organic light emitting display device according to claim 14 , wherein the second hole transporting layer is spaced apart from the first hole transporting layer disposed on an area overlapped with the bank and is insulated from the first hole transporting layer.

16. The organic light emitting display device according to claim 1 , wherein the first hole transporting layer is entirely overlapped with the third hole transporting layer, and the second hole transporting layer is entirely overlapped with the third hole transporting layer.

17. The organic light emitting display device according to claim 1 , wherein the first hole transporting layer is stacked on the third hole transporting layer, and the second hole transporting layer is stacked on the third hole transporting layer.

18. The organic light emitting display device according to claim 17 , wherein the third hole transporting layer is disposed between the first anode electrode and the first hole transporting layer, and between the second anode electrode and the second hole transporting layer.

19. The organic light emitting display device according to claim 18 , wherein the thickness of the third hole transporting layer is at least 500 Å.

20. The organic light emitting display device according to claim 18 , wherein the thickness of the third hole transporting layer is in a range of 1200 Å to 1500 Å.

Assignees

• Lg Display Co Ltd

Inventors

• Kim Hyunsuk
• Choi Sunghoon
• YOON SungJi

Classifications

• H01L51/5234

  Electricity · mapped topic

• H01L27/3211

  Electricity · mapped topic

• H01L51/5036

  Electricity · mapped topic

• H01L51/5072

  Electricity · mapped topic

• H01L2251/5315

  Electricity · mapped topic