Organic electroluminescence display device

Patent metadata

Field	Value
Publication number	US-11545643-B2
Application number	US-202117352111-A
Country	US
Kind code	B2
Filing date	Jun 18, 2021
Priority date	Apr 24, 2018
Publication date	Jan 3, 2023
Grant date	Jan 3, 2023

Abstract

An organic electroluminescence display device includes: a substrate; a first electrode including a first sub-electrode and a second sub-electrode spaced apart from each other and on the substrate; a first light emitting unit on the first electrode; a charge generation unit on the first light emitting unit; a second light emitting unit on the charge generation unit; and a second electrode on the second light emitting unit, wherein the first light emitting unit comprises a first light emitting layer correspondingly on the first sub-electrode; and a second light emitting layer correspondingly on the second sub-electrode, wherein the second light emitting unit comprises a third light emitting layer correspondingly on the first light emitting layer; and a fourth light emitting layer correspondingly on the second light emitting layer.

First claim

What is claimed is:

1. An organic electroluminescence display device comprising:
a substrate including a first light emitting region, a second light emitting region, and a non-light emitting region between the first light emitting region and the second light emitting region;
a first electrode including a first sub-electrode on the first light emitting region and a second sub-electrode on the second light emitting region;
a pixel defining layer on the non-light emitting region;
a first light emitting unit on the first electrode;
a charge generation unit including an n-type charge generation layer on the first light emitting unit and a p-type charge generation layer on the n-type charge generation layer;
a second light emitting unit on the charge generation unit; and
a second electrode on the second light emitting unit,
wherein the first light emitting unit comprises a first light emitting layer on the first sub-electrode; and a second light emitting layer on the second sub-electrode,
wherein the second light emitting unit comprises a third light emitting layer on the first light emitting layer; and a fourth light emitting layer on the second light emitting layer,
wherein the n-type charge generation layer is arranged as a common layer on the first light emitting region, the second light emitting region, and the non-light emitting region; and
the p-type charge generation layer includes a first p-type charge generation layer arranged as a pattern layer corresponding to the first light emitting region and a second p-type charge generation layer arranged as a pattern layer corresponding to the second light emitting region.

2. The device of claim 1 , wherein
the first light emitting layer and the third light emitting layer emit light of a same color,
the second light emitting layer and the fourth light emitting layer emit light of a same color, and
the first light emitting layer and the second light emitting layer emit light of different colors.

3. The device of claim 1 , wherein the first p-type charge generation layer and the second p-type charge generation layer are spaced apart from each other.

4. The device of claim 1 , wherein
the first p-type charge generation layer is on the first light emitting layer, and
the second p-type charge generation layer is on the second light emitting layer.

5. The device of claim 4 , wherein
the substrate further comprises a third light emitting region spaced apart from the first light emitting region and the second light emitting region,
the first electrode further comprises a third sub-electrode on the third light emitting region, and the third sub-electrode is spaced apart from the first sub-electrode and the second sub-electrode,
the first light emitting unit further comprises a fifth light emitting layer on the third sub-electrode,
the second light emitting unit further comprises a sixth light emitting layer on the fifth light emitting layer, and
the p-type charge generation layer further comprises a third p-type charge generation layer on the fifth light emitting layer.

6. The device of claim 5 , wherein the fifth light emitting layer and the sixth light emitting layer emit light of a same color, and the fifth light emitting layer emits light of a different color from each of the first light emitting layer and the second light emitting layer.

7. The device of claim 5 , wherein
each of the first light emitting layer and the third light emitting layer is a red light emitting layer,
each of the second light emitting layer and the fourth light emitting layer is a green light emitting layer, and
each of the fifth light emitting layer and the sixth light emitting layer is a blue light emitting layer.

8. The device of claim 7 , wherein the fifth light emitting layer emits a first blue light having a first central wavelength, and the sixth light emitting layer emits a second blue light having a second central wavelength different from the first central wavelength.

9. The device of claim 5 , wherein a thickness of the first light emitting layer is greater than a thickness of the second light emitting layer, and the thickness of the second light emitting layer is greater than a thickness of the fifth light emitting layer, and
a thickness of the third light emitting layer is greater than a thickness of the fourth light emitting layer and the thickness of the fourth light emitting layer is greater than a thickness of the sixth light emitting layer.

10. The device of claim 1 , wherein the pixel defining layer comprises a polyacrylate resin or a polyimide resin.

11. The device of claim 1 , wherein the n-type charge generation layer has a step difference, and each of the first p-type charge generation layer and the second p-type charge generation layer has no step difference.

12. The device of claim 1 , wherein
the first light emitting unit further comprises:
a first hole transport layer below the first light emitting layer and the second light emitting layer, and on the first sub-electrode and the second sub-electrode; and
a first electron transport layer on the first light emitting layer and on the second light emitting layer, and below the charge generation unit,
wherein
the second light emitting unit further comprises:
a second hole transport layer below the third light emitting layer and the fourth light emitting layer, and on the charge generation unit; and
a second electron transport layer on the third light emitting layer and the fourth light emitting layer, and below the second electrode.

13. The device of claim 1 , wherein a thickness of the n-type charge generation layer is 50 Å to 300 Å, and a thickness of the p-type charge generation layer is 50 Å to 200 Å.

14. The device of claim 1 , wherein
the n-type charge generation layer comprises an n-type dopant, and the p-type charge generation layer comprises a p-type dopant,
a doping ratio of the n-type dopant is 1 wt % to 10 wt %, and
a doping ratio of the p-type dopant is 2 wt % to 15 wt %.

15. An organic electroluminescence display device comprising:
a substrate including a first light emitting region, a second light emitting region, and a non-light emitting region;
a first electrode including a first sub-electrode on the first light emitting region and a second sub-electrode on the second light emitting region;
a first light emitting unit on the first electrode;
a charge generation unit including an n-type charge generation layer on the first light emitting unit and a p-type charge generation layer on the n-type charge generation layer;
a second light emitting unit on the charge generation unit; and
a second electrode on the second light emitting unit,
wherein the first light emitting unit comprises a first light emitting layer on the first sub-electrode; and a second light emitting layer on the second sub-electrode,
wherein the second light emitting unit comprises a third light emitting layer on the first light emitting layer; and a fourth light emitting layer on the second light emitting layer,
wherein one of the n-type charge generation layer and the p-type charge generation layer includes a first sub charge generation layer on the first light emitting region and a second sub charge generation layer on the second light emitting region.

16. The device of claim 15 , wherein another of the n-type charge generation layer and the p-type charge generation layer overlaps the first light emitting region, the second light emitting region, and the non-light emitting region.

17. The device of claim 15 , wherein the non-light emitting re

Assignees

• Samsung Display Co Ltd

Inventors

• Yang Jungjin
• Kim Myunghwan
• Kim Seohyun
• Kim Ji-Young
• Park Jinwoo
• Song Wonjun
• Yoo Taewoong
• Youn Soojung
• Lee Kwanhee
• Lee Seokjae

Classifications

• H01L27/3209

  Electricity · mapped topic

• H01L51/5072

  Electricity · mapped topic

• H01L51/5203 Primary

  Electricity · mapped topic

• H01L51/5056

  Electricity · mapped topic

• H10K59/12

  Active-matrix OLED [AMOLED] displays · CPC title