ORGANIC LIGHT EMITTING DIODE DISPLAY AND MANUFACTURING METHOD THEREOF

• US 20170033309A1
• Filed: 12/11/2015
• Published: 02/02/2017
• Est. Priority Date: 07/28/2015
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: SONG, A Ree, WON, Byeong-Hee, BAEK, Jong In, PARK, Won Sang
• Granted Patent: US 10,044,004 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H10K 2102/351 Thickness
• CPC Class Codes: H10K 50/156 comprising a multilayered structure
• CPC Class Codes: H10K 50/17 Carrier injection layers
• 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 59/352 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
• CPC Class Codes: H10K 71/166 using selective deposition, e.g. using a mask

Abstract

A method for manufacturing an organic light emitting diode display includes: forming a hole injection layer on a substrate formed with a pixel circuit; forming a first assistance layer and a second assistance layer on the hole injection layer, the first assistance layer and the second assistance layer being disposed on different positions of the hole injection layer; forming a first organic emission layer on the first assistance layer; and forming a first hole transporting layer on the second assistance layer

Claims

1. An organic light emitting diode display comprising:

a first organic light emitting element configured to emit light corresponding to a first wavelength region;

a second organic light emitting element configured to emit light corresponding to a second wavelength region, a center wavelength of the second wavelength region being shorter than a center wavelength of the first wavelength region;

a third organic light emitting element configured to emit light corresponding to a third wavelength region, a center wavelength of the third wavelength region being longer than the center wavelength of the first wavelength region;

a fourth organic light emitting element configured to emit light corresponding to a fourth wavelength region, a center wavelength of the fourth wavelength region being longer than the center wavelength of the third wavelength region; and

a hole injection layer disposed under the first organic light emitting element, the second organic light emitting element, the third organic light emitting element, and the fourth organic light emitting element,

wherein the first organic light emitting element comprises a first assistance layer disposed on the hole injection layer, and

the fourth organic light emitting element comprises a second assistance layer disposed on the hole injection layer.

2. The organic light emitting diode display of claim 1, wherein:

the first organic light emitting element comprises a first organic emission layer disposed on the first assistance layer, and

the second organic light emitting element comprises a second organic emission layer disposed on the hole injection layer.

3. The organic light emitting diode display of claim 2, wherein:

the first organic emission layer and the second organic emission layer comprise a same material.

4. The organic light emitting diode display of claim 1, wherein:

a thickness of the first assistance layer is substantially the same as a thickness of the second assistance layer.

5. The organic light emitting diode display of claim 1, wherein:

the first assistance layer and the second assistance layer comprise a same material.

6. The organic light emitting diode display of claim 1, wherein:

the fourth organic light emitting element comprises a first hole transporting layer disposed on the second assistance layer, and

the third organic light emitting element comprises a second hole transporting layer disposed on the hole injection layer.

7. The organic light emitting diode display of claim 6, wherein:

a thickness of the first hole transporting layer is substantially the same as a thickness of the second hole transporting layer.

8. The organic light emitting diode display of claim 6, wherein:

the fourth organic light emitting element comprises a third assistance layer disposed on the first hole transporting layer.

9. The organic light emitting diode display of claim 8, wherein:

a thickness of the third assistance layer is 10 nm or less.

10. The organic light emitting diode display of claim 1, wherein:

the first organic light emitting element and the second organic light emitting element are configured to emit different blue light.

11. The organic light emitting diode display of claim 10, wherein:

the first wavelength region is 459 nm to 490 nm, and

the second wavelength region is 440 nm to 458 nm.

12. The organic light emitting diode display of claim 1, wherein:

the third organic light emitting element is configured to emit green light, and

the fourth organic light emitting element is configured to emit red light.

13. The organic light emitting diode display of claim 1, wherein:

the hole injection layer is integrally formed to be positioned under the first organic light emitting element, the second organic light emitting element, the third organic light emitting element, and the fourth organic light emitting element.

14. A method for manufacturing an organic light emitting diode display comprising:

forming a hole injection layer on a substrate formed with a pixel circuit;

forming a first assistance layer and a second assistance layer on the hole injection layer, the first assistance layer and the second assistance layer being disposed on different positions of the hole injection layer;

forming a first organic emission layer on the first assistance layer; and

forming a first hole transporting layer on the second assistance layer.

15. The method of claim 14, wherein:

when forming the first organic emission layer,

a second organic emission layer is simultaneously formed on the hole injection layer, at a position separate from the first organic emission layer.

16. The method of claim 15, wherein:

when forming the first hole transporting layer,

a second hole transporting layer is simultaneously formed on the hole injection layer, at a position separate from the first organic emission layer, the second organic emission layer, and the first hole transporting layer.

17. The method of claim 16, further comprising:

forming a third organic emission layer on the second hole transporting layer.

18. The method of claim 14, further comprising:

forming a third assistance layer on the first hole transporting layer.

19. The method of claim 18, further comprising:

forming a fourth organic emission layer on the third assistance layer.

20. An organic light emitting diode display comprising:

a first organic light emitting element configured to emit light corresponding to a first wavelength region;

a second organic light emitting element configured to emit light corresponding to a second wavelength region, a center wavelength of the second wavelength region being shorter than a center wavelength of the first wavelength region;

a third organic light emitting element configured to emit light corresponding to a third wavelength region, a center wavelength of the third wavelength region being longer than the center wavelength of the first wavelength region;

a fourth organic light emitting element configured to emit light corresponding to a fourth wavelength region, a center wavelength of the fourth wavelength region being longer than the center wavelength of the third wavelength region; and

a hole injection layer disposed under the first organic light emitting element, the second organic light emitting element, the third organic light emitting element, and the fourth organic light emitting element,

wherein the first organic light emitting element and the fourth organic light emitting element each comprises an assistance layer, and

the fourth organic light emitting element comprises a hole transporting layer.