Organic light emitting device

Patent metadata

Field	Value
Publication number	US-9721997-B2
Application number	US-201514713879-A
Country	US
Kind code	B2
Filing date	May 15, 2015
Priority date	May 16, 2014
Publication date	Aug 1, 2017
Grant date	Aug 1, 2017

Abstract

Provided is an organic light emitting device including: an organic emission layer disposed between a first electrode and a second electrode and in a plurality of sub-pixel areas; a plurality of electroluminescence units which include the organic emission layer and are formed by stacking; and a charge generation layer between the plurality of electroluminescence units, where the charge generation layers respectively disposed in the plurality of sub-pixel areas have a step and are formed at different positions, and the second electrodes respectively disposed in the multiple sub-pixel areas have a step and are formed at different positions.

First claim

What is claimed is:

1. An organic light emitting device comprising:
a charge generation layer in red, green, and blue sub-pixel areas between a first electrode and a second electrode;
a first electroluminescence unit which includes an organic emission layer fanned in the red, green, and blue sub-pixel areas and formed between the first electrode and the charge generation layer; and
a second electroluminescence unit which includes an organic emission layer formed in the red, green, and blue sub-pixel areas and formed between the charge generation layer and the second electrode,
wherein the charge generation layer is disposed in each of the red, green, and blue sub-pixel areas in a disconnected manner such that the charge generation layer does not function as a lateral current path between the red, green, and blue sub-pixel areas.

2. The organic light emitting device according to claim 1 , wherein the organic emission layers in the first electroluminescence unit and the second electroluminescence unit include a red emission layer corresponding to the red sub-pixel area, a green emission layer corresponding to the green sub-pixel area, and a blue emission layer corresponding to the blue sub-pixel area, respectively.

3. The organic light emitting device according to claim 2 , wherein a thickness of the red emission layer, a thickness of the green emission layer, and a thickness of the blue emission layer in the first electroluminescence unit are different from each other.

4. The organic light emitting device according to claim 3 , wherein the thickness of the green emission layer in the first electroluminescence unit is smaller than the thickness of the red emission layer in the first electroluminescence unit and greater than the thickness of the blue emission layer in the first electroluminescence unit.

5. The organic light emitting device according to claim 4 , the thickness of the red emission layer in the first electroluminescence unit is greater than the thickness of the red emission layer in the second electroluminescence unit.

6. The organic light emitting device according to claim 5 , wherein the thickness of the blue emission layer in the first electroluminescence unit is smaller than the thickness of the blue emission layer in the second electroluminescence unit.

7. The organic light emitting device according to claim 4 , wherein a thickness difference of the green emission layer in the first electroluminescence unit and the red emission layer in the first electroluminescence unit and a thickness difference of the green emission layer in the first electroluminescence unit and the blue emission layer in the first electroluminescence unit are equal to or larger than 200 Å.

8. The organic light emitting device according to claim 4 , further comprising:
a first hole transporting layer under the organic emission layer of the first electroluminescence unit; and
a second hole transporting layer under the organic emission layer of the second electroluminescence unit,
wherein a thickness of the first hole transporting layer in the red sub-pixel area, a thickness of the first hole transporting layer in the green sub-pixel area, and a thickness of the first hole transporting layer in the blue sub-pixel area are different from each other.

9. The organic light emitting device according to claim 8 , wherein the thickness of the first hole transporting layer in the green sub-pixel area is smaller than the thickness of the first hole transporting layer in the red sub-pixel area and greater than the thickness of the first hole transporting layer in the blue sub-pixel area.

10. The organic light emitting device according to claim 9 , wherein a thickness of the second hole transporting layer in the green sub-pixel area is greater than a thickness of the second hole transporting layer in the red sub-pixel area and smaller than a thickness of the second hole transporting layer in the blue sub-pixel area.

11. The organic light emitting device according to claim 9 , wherein a thickness difference of the first hole transporting layer in the red sub-pixel area and the first hole transporting layer in the green sub-pixel area, and a thickness difference of the first hole transporting layer in the green sub-pixel area and the first hole transporting layer in the blue sub-pixel area are equal to or larger than 200 Å.

12. The organic light emitting device according to claim 3 , wherein the thickness of the green emission layer in the first electroluminescence unit is greater than the red emission layer in the first electroluminescence unit and smaller than the thickness of the blue emission layer in the first electroluminescence unit.

13. The organic light emitting device according to claim 12 , wherein the thickness of the red emission layer in the first electroluminescence unit is smaller than the thickness of the red emission layer in the second electroluminescence unit.

14. The organic light emitting device according to claim 13 , wherein the thickness of the blue emission layer in the first electroluminescence unit is greater than the thickness of the blue emission layer in the second electroluminescence unit.

15. An organic light emitting device comprising:
a plurality of electroluminescence units between a first electrode and a second electrode, each of the plurality of electroluminescence units including an organic emission layer being disposed in a plurality of sub-pixel areas; and
a charge generation layer interposed between two adjacent electroluminescence units of the plurality of electroluminescence units, the charge generation layer being disposed in the plurality of sub-pixel areas,
wherein the charge generation layer has a step in each boundary between adjacent sub-pixel areas, such that the charge generation layer is disconnected between the adjacent sub-pixel areas.

16. The organic light emitting device according to claim 15 , wherein the organic emission layer in each of the electroluminescence units includes a red emission layer, a green emission layer, and a blue emission layer.

17. The organic light emitting device according to claim 16 , wherein a thickness of the red emission layer, a thickness of the green emission layer, and a thickness of the blue emission layer are different from each other.

18. The organic light emitting device according to claim 17 , wherein the thickness of the red emission layer in the electroluminescence unit is greater than the thickness of the green emission layer in the electroluminescence unit, and the thickness of the green emission layer in the electroluminescence unit is greater than the thickness of the blue emission layer in the electroluminescence unit.

19. The organic light emitting device according to claim 15 , wherein a height of the step of the charge generation layer is equal to or larger than 200 Å.

20. An organic light emitting device comprising:
a plurality of sub-pixel areas, each sub-pixel area comprising at least a first organic emission layer and a second organic emission layer; and
a charge generation layer between the first and second organic emission layers in each sub-pixel area, the charge generation layer having a configuration that minimizes current flow between one or more charge generation layers in an adjacent sub-pixel area,
wherein the configuration is achieved by thickness differences of layers under each charge generation layer in each sub-pixel area such that adjacent charge generation layers are non-continuous.

21. The organic ligh

Assignees

• Lg Display Co Ltd

Inventors

• Lee Sehee

Classifications

• H01L51/504

  Electricity · mapped topic

• H01L51/5278

  Electricity · mapped topic

• H01L51/5064

  Electricity · mapped topic

• H01L27/3211 Primary

  Electricity · mapped topic

• H01L27/3216

  Electricity · mapped topic