Organic light emitting diode display and manufacturing method thereof

• US 10,529,957 B2
• Filed: 08/03/2018
• Issued: 01/07/2020
• 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
• Primary Examiner(s): Shamsuzzaman, Mohammed
• Application Number:
  US16/054,095
• Publication Number:
  US 20180342709A1
• Time in Patent Office: 522 Days
• 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;

a hole injection layer disposed in 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;

assistance layers comprising a first assistance layer disposed on the hole injection layer of the first organic light emitting element and a second assistance layer disposed on the hole injection layer of the fourth organic light emitting element,

wherein;

the first assistance layer and the second assistance layer comprise a same conductive material and have a same thickness;

the fourth organic light emitting element comprises a first hole transporting layer disposed on the hole injection layer; and

the first hole transporting layer comprises a different material from the first assistance layer and the second assistance layer and has a different thickness from the first assistance layer and the second assistance 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 in the second organic light emitting element.

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

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

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

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

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

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

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

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

8. 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.

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

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

the second wavelength region is 440 nm to 458 nm.

10. The organic light emitting diode display of claim 9, 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.

11. 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 in 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;

each of the first organic light emitting element and the fourth organic light emitting element comprises an assistance layer on the hole injection layer;

the fourth organic light emitting element comprises a hole transporting layer disposed on the hole injection layer; and

the assistance layer of the first organic light emitting element and the assistance layer of the fourth organic light emitting element comprise a same conductive material and have a same thickness.

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

the assistance layer is disposed between a substrate and a common electrode of the first organic light emitting element and the fourth organic light emitting element.

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

the hole transporting layer comprises a different material from the assistance layer in the fourth organic light emitting element and has a different thickness from the assistance layer in the fourth organic light emitting element.

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

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

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

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

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

16. The organic light emitting diode display of claim 15, wherein:

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

the second wavelength region is 440 nm to 458 nm.

17. The organic light emitting diode display of claim 16, 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.