Organic light emitting diode display and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-10529957-B2
Application number	US-201816054095-A
Country	US
Kind code	B2
Filing date	Aug 3, 2018
Priority date	Jul 28, 2015
Publication date	Jan 7, 2020
Grant date	Jan 7, 2020

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.

First claim

What is claimed is:

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.

Assignees

• Samsung Display Co Ltd

Inventors

• SONG A Ree
• Won Byeong-Hee
• Baek Jong In
• Park Won Sang

Classifications

• H01L51/5265

  Electricity · mapped topic

• H01L2251/558

  Electricity · mapped topic

• H01L27/3216

  Electricity · mapped topic

• H01L27/3213

  Electricity · mapped topic

• H01L51/56 Primary

  Electricity · mapped topic