Organic light emitting device display and method of manufacturing the same

• US 20110180825A1
• Filed: 01/26/2011
• Published: 07/28/2011
• Est. Priority Date: 01/27/2010
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Lee, Sang-Pil, Song, Young-Rok, Choi, Beohm-Rock, Song, Jung-Bae
• Granted Patent: US 8,471,275 B2
• Time in Patent Office: Days
• US Class Current: 257/89
• CPC Class Codes: H10K 2102/351 Thickness
• CPC Class Codes: H10K 50/14 Carrier transporting layers
• CPC Class Codes: H10K 50/852 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 59/30 Devices specially adapted for multicolour light emission
• CPC Class Codes: H10K 59/352 the areas of the RGB subpixels being different
• CPC Class Codes: H10K 59/353 characterised by the geometrical arrangement of the RGB subpixels
• CPC Class Codes: H10K 59/876 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass

Abstract

An organic light emitting device display, including a first electrode in red, green, and blue sub-pixels on a substrate, a hole injection layer above the substrate so as to cover the first electrode, a hole transport layer above the hole injection layer, an auxiliary layer between the hole injection layer and the hole transport layer in the red sub-pixel, a red light emission layer and a green light emission layer above the hole transport layer in the red sub-pixel and the green sub-pixel, the red light emission layer being between the green light emission layer and the hole transport layer, and a blue light emission layer above the hole transport layer in the blue sub-pixel.

Claims

1. An organic light emitting device display, comprising:

a first electrode in red, green, and blue sub-pixels on a substrate;

a hole injection layer above the substrate so as to cover the first electrode;

a hole transport layer above the hole injection layer;

an auxiliary layer between the hole injection layer and the hole transport layer in the red sub-pixel;

a red light emission layer and a green light emission layer above the hole transport layer in the red sub-pixel and the green sub-pixel, the red light emission layer being between the green light emission layer and the hole transport layer; and

a blue light emission layer above the hole transport layer in the blue sub-pixel.

2. The organic light emitting device display as claimed in claim 1, wherein the red light emission layer has a hole transport ability, and the green light emission layer has an electron transport ability.

3. The organic light emitting device display as claimed in claim 1, wherein the auxiliary layer has a hole transport ability.

4. The organic light emitting device display as claimed in claim 3, wherein the auxiliary layer includes the same material as the hole transport layer.

5. The organic light emitting device display as claimed in claim 1, wherein the thickness of the auxiliary layer is between about 300 Å

and about 1,500 Å

.

6. The organic light emitting device display as claimed in claim 1, wherein the thickness of the red light emission layer is between about 500 Å

and about 2,000 Å

, and the thickness of the green light emission layer is between about 100 Å and

about 1,000 Å

.

7. The organic light emitting device display as claimed in claim 1, wherein the blue light emission layer is on the green light emission layer whereby the blue light emission layer is common to at least the blue sub-pixel and the green sub-pixel.

8. The organic light emitting device display as claimed in claim 7, wherein the thickness of the blue light emission layer is between about 100 Å

and about 500 Å

.

9. A method of manufacturing an organic light emitting device display, the method comprising:

forming a first electrode for each of red, green, and blue sub-pixels on a substrate;

forming a hole injection layer above the substrate so as to cover the first electrode;

forming an auxiliary layer above the hole injection layer in the red sub-pixel;

forming a hole transport layer above the hole injection layer so as to cover the auxiliary layer; and

sequentially forming a red light emission layer and a green light emission layer above the hole transport layer in the red sub-pixel and the green sub-pixel.

10. The method as claimed in claim 9, wherein the red light emission layer has a hole transport ability, and the green light emission layer has an electron transport ability.

11. The method as claimed in claim 10, wherein the auxiliary layer has a hole transport ability.

12. The method as claimed in claim 11, wherein the auxiliary layer includes the same material as the hole transport layer.

13. The method as claimed in claim 9, wherein the thickness of the auxiliary layer is between about 300 Å

and about 1,500 Å

.

14. The method as claimed in claim 9, wherein the thickness of the red light emission layer is between about 500 Å

and about 2,000 Å

, and the thickness of the green light emission layer is between about 100 Å and

about 1,000 Å

.

15. The method as claimed in claim 9, further comprising forming a blue light emission layer on the hole transport layer in the blue sub-pixel.

16. The method as claimed in claim 15, wherein the blue light emission layer is formed by being patterned by using a fine metal mask.

17. The method as claimed in claim 9, further comprising forming a blue light emission layer on the green light emission layer and the hole transport layer so as to form the blue light emission layer as a common layer above a front surface of the substrate.

18. The method as claimed in claim 17, wherein the thickness of the blue light emission layer is between about 100 Å

and about 500 Å

.

19. The method as claimed in claim 17, wherein the auxiliary layer, the red light emission layer, and the green light emission layer are formed by being patterned by using a fine metal mask.

20. The method as claimed in claim 19, wherein the blue light emission layer is formed by being patterned by using an open mask.