Display apparatus

• US 10,269,872 B2
• Filed: 07/22/2016
• Issued: 04/23/2019
• Est. Priority Date: 01/12/2016
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Group)
• Original Assignee: Samsung Display Company Limited (Samsung Group)
• Inventors: Sung, Eunjin, Baek, Jongin, Won, Byeonghee, Park, Wonsang
• Primary Examiner(s): Malsawma, Lex H
• Application Number:
  US15/217,106
• Publication Number:
  US 20170200771A1
• Time in Patent Office: 1,005 Days
• Field of Search: None
• CPC Class Codes: H10K 2102/351 Thickness
• CPC Class Codes: H10K 50/8445 multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers
• CPC Class Codes: H10K 50/852 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 59/351 comprising more than three subpixels, e.g. red-green-blue-white [RGBW]
• CPC Class Codes: H10K 59/8731 multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers
• CPC Class Codes: H10K 59/876 comprising a resonant cavity structure, e.g. Bragg reflector pair

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.

Claims

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 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, and the first intermediate layer, the second intermediate layer, the third intermediate layer, and the fourth intermediate layer are respectively disposed interposing the first electrode and the second electrode therebetween,

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, and

wherein the first blue sub pixel and the second blue sub pixel have different thicknesses.

20. The display apparatus of claim 19, wherein the first electrode of the first blue sub pixel and the first electrode of the second sub pixel have a same thickness.