Display apparatus

Patent metadata

Field	Value
Publication number	US-10269872-B2
Application number	US-201615217106-A
Country	US
Kind code	B2
Filing date	Jul 22, 2016
Priority date	Jan 12, 2016
Publication date	Apr 23, 2019
Grant date	Apr 23, 2019

Abstract

A display apparatus includes a unit pixel comprising a red sub pixel, a green sub pixel, a first blue sub pixel, and a second blue sub pixel. Each of the sub pixels include a first electrode, an intermediate layer comprising an organic emission layer disposed on the first electrode, and a second electrode disposed on the intermediate layer. The first blue sub pixel includes a first intermediate layer including a first blue organic emission layer, the second blue sub pixel includes a second intermediate layer including a second blue organic emission layer, the green sub pixel includes a third intermediate layer including a green organic emission layer, and the red sub pixel includes a fourth intermediate layer including a red organic emission layer. The first intermediate layer and the second intermediate layer have different thicknesses, and the third intermediate layer and the fourth intermediate layer have different thicknesses.

First claim

What is claimed is:

1. A display apparatus comprising a unit pixel, the unit pixel comprising:
a first blue sub pixel comprising a first intermediate layer, the first intermediate layer comprising a first blue organic emission layer;
a second blue sub pixel comprising a second intermediate layer, the second intermediate layer comprising a second blue organic emission layer;
a green sub pixel comprising a third intermediate layer, the third intermediate layer comprising a green organic emission layer; and
a red sub pixel comprising a fourth intermediate layer, the fourth intermediate layer comprising a red organic emission layer,
wherein each of the first blue sub pixel, the second blue sub pixel, the red sub pixel, and the green sub pixel comprises a first electrode and a second electrode, the first intermediate layer, the second intermediate layer, the third intermediate layer, and the fourth intermediate layer respectively disposed interposing the first electrode and the second electrode,
wherein the first intermediate layer and the second intermediate layer have different thicknesses, and the third intermediate layer and the fourth intermediate layer have different thicknesses,
wherein the first intermediate layer comprises a first blue auxiliary layer, and the second intermediate layer comprises a second blue auxiliary layer,
wherein the first blue auxiliary layer comprises at least one sub layer additional to the same structure of the second blue auxiliary layer, and
wherein the first blue sub pixel is configured to generate a sky blue color and the second blue sub pixel is configured to generate a deep blue color.

2. The display apparatus of claim 1 , wherein a thickness of the first intermediate layer is greater than a thickness of the second intermediate layer.

3. The display apparatus of claim 1 , wherein
the first blue auxiliary layer is disposed between the first blue organic emission layer and the first electrode, between the first blue organic emission layer and the second electrode, or both between the first blue organic emission layer and the first electrode and between the first blue organic emission layer and the second electrode, and
the second blue auxiliary layer is disposed between the second blue organic emission layer and the first electrode, between the second blue organic emission layer and the second electrode, or both between the second blue organic emission layer and the first electrode and between the second blue organic emission layer and the second electrode.

4. The display apparatus of claim 3 , wherein a thickness of the first blue auxiliary layer is different from a thickness of the second blue auxiliary layer.

5. The display apparatus of claim 4 , wherein a thickness of the first blue organic emission layer is same as a thickness of the second blue organic emission layer.

6. The display apparatus of claim 4 , wherein a thickness of the first blue organic emission layer is different from a thickness of the second blue organic emission layer.

7. The display apparatus of claim 3 , wherein the first blue auxiliary layer comprises at least one of a first hole injection layer, a first hole transport layer, a first electron injection layer, a first electron transport layer, and a first functional layer.

8. The display apparatus of claim 3 , wherein the second blue auxiliary layer comprises at least one of a second hole injection layer, a second hole transport layer, a second electron injection layer, a second electron transport layer, and a second functional layer.

9. The display apparatus of claim 3 , wherein a thickness of the first blue organic emission layer is different from a thickness of the second blue organic emission layer.

10. The display apparatus of claim 9 , wherein the thickness of the first blue auxiliary layer is same as the thickness of the second blue auxiliary layer.

11. The display apparatus of claim 1 , wherein the first blue organic emission layer and the second blue organic emission layer are formed of a same material.

12. The display apparatus of claim 1 , wherein the first blue organic emission layer and the second blue organic emission layer comprise different materials.

13. The display apparatus of claim 12 , wherein the first blue organic emission layer comprises a material having a light-emission peak within a photoluminescence wavelength range of 460 nm to 480 nm.

14. The display apparatus of claim 12 , wherein the second blue organic emission layer comprises a material having a light-emission peak within a photoluminescence wavelength range of 440 nm to 460 nm.

15. The display apparatus of claim 1 , wherein, when a current is applied, the first intermediate layer and the second intermediate layer are configured to emit light with wavelengths having different light-emission peaks, respectively.

16. The display apparatus of claim 15 , wherein the first intermediate layer emits a blue color having a light-emission peak within a photoluminescence wavelength range of 460 nm to 490 nm.

17. The display apparatus of claim 15 , wherein the second intermediate layer emits a blue color having a light-emission peak within a photoluminescence wavelength range of 460 nm or less.

18. A display apparatus that comprises a unit pixel, the unit pixel comprising:
a first blue sub pixel comprising a first blue organic emission layer and a first blue auxiliary layer;
a second blue sub pixel comprising a second blue organic emission layer and a second blue auxiliary layer;
a green sub pixel comprising a green organic emission layer and a green auxiliary layer; and
a red sub pixel comprising a red organic emission layer and a red auxiliary layer,
wherein each of the first blue sub pixel, the second blue sub pixel, the red sub pixel, and the green sub pixel comprises a first electrode and a second electrode, the first blue organic emission layer and the first blue auxiliary layer, the second blue organic emission layer and the second auxiliary layer, the green organic emission layer and the green auxiliary layer, and the red organic emission layer and the red auxiliary layer respectively disposed between the first electrode and the second electrode,
wherein the first blue auxiliary layer and the second blue auxiliary layer have different thicknesses,
wherein the first blue auxiliary layer comprises at least one sub layer additional to the same structure of the second blue auxiliary layer,
wherein the first electrode and the second electrode of the first blue sub pixel respectively have the same structure as the first electrode and the second electrode of the second blue sub pixel,
wherein the first blue organic emission layer and the second blue organic emission layer are formed of a same material, and
wherein the first blue sub pixel is configured to generate a sky blue color and the second blue sub pixel is configured to generate a deep blue color.

19. A display apparatus comprising a unit pixel, the unit pixel comprising:
a first blue sub pixel comprising a first intermediate layer, the first intermediate layer comprising a first blue organic emission layer;
a second blue sub pixel comprising a second intermediate layer, the second intermediate layer comprising a second blue organic emission layer;
a green sub pixel comprising a third intermediate layer, the third intermediate layer comprising a green organic emission layer; and
a red sub pixel comprising a fourth intermediate layer, the fourth intermediate layer comprising a red organic emission layer,
wherein each of the fi

Assignees

• Samsung Display Co Ltd

Inventors

• Sung Eunjin
• Baek Jongin
• Won Byeonghee
• Park Wonsang

Classifications

• H01L51/5265

  Electricity · mapped topic

• H01L27/3213 Primary

  Electricity · mapped topic

• H01L51/5056

  Electricity · mapped topic

• H01L27/3246

  Electricity · mapped topic

• H01L51/5088

  Electricity · mapped topic