Organic electroluminescence display device

Patent metadata

Field	Value
Publication number	US-11871597-B2
Application number	US-202218148194-A
Country	US
Kind code	B2
Filing date	Dec 29, 2022
Priority date	Apr 24, 2018
Publication date	Jan 9, 2024
Grant date	Jan 9, 2024

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. A light emitting display device comprising:
a display panel; and
a touch sensing unit on the display panel,
wherein the display panel comprises:
a substrate including a first light emitting region, a second light emitting region, and a non-light emitting region;
a first electrode comprising 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 comprising 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 comprises 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.

2. The light emitting display device of claim 1 , 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.

3. The light emitting display device of claim 1 , wherein the non-light emitting region is between the first light emitting region and the second light emitting region, and
wherein the light emitting display device further comprises a partition part on the substrate corresponding to the non-light emitting region.

4. The light emitting display device of claim 3 , wherein the partition part comprises a polyacrylate resin or a polyimide resin.

5. The light emitting display device of claim 4 , wherein the partition part further comprises at least one selected from an inorganic material, a light absorbing material, a black pigment, or a black dye.

6. The light emitting display device of claim 1 , wherein
the substrate further comprises a third light emitting region spaced from the first light emitting region and the second light emitting region,
the first electrode further comprises a third sub-electrode spaced from the first sub-electrode and the second sub-electrode,
the first light emitting unit further comprises a fifth light emitting layer correspondingly on the third sub-electrode, and
the second light emitting unit further comprises a sixth light emitting layer correspondingly on the fifth light emitting layer.

7. The light emitting display device of claim 6 , wherein the n-type charge generation layer is arranged as a common layer on the first light emitting region, the second light emitting region, the third light emitting region, and the non-light emitting region, and
wherein the p-type charge generation layer comprises a first p-type charge generation layer arranged as a pattern layer corresponding to the first light emitting region, a second p-type charge generation layer arranged as a pattern layer corresponding to the second light emitting region, and a third p-type charge generation layer arranged as a pattern layer corresponding to the third light emitting region.

8. The light emitting display device of claim 7 , wherein each of the first p-type charge generation layer, the second p-type charge generation layer, and the third p-type charge generation layer does not overlap with the non-light emitting region.

9. The light emitting display device of claim 6 , 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.

10. The light emitting display device of claim 9 , wherein the fifth light emitting layer is configured to emit a first blue light having a first central wavelength, and the sixth light emitting layer is configured to emit a second blue light having a second central wavelength different from the first central wavelength.

11. The light emitting display device of claim 6 , 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.

12. The light emitting display 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 %.

13. A light emitting display device comprising:
a display panel; and
an input sensing unit on the display panel,
wherein the display panel comprises:
a substrate including a first light emitting region, a second light emitting region, a third light emitting region, and a non-light emitting region;
a first electrode comprising a first sub-electrode on the first light emitting region; a second sub-electrode on the second light emitting region; and a third sub-electrode on the third light emitting region;
a first light emitting unit on the first electrode;
a charge generation unit comprising 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 red light emitting layer on the first sub-electrode, a first green light emitting layer on the second sub-electrode, and a first blue light emitting layer on the third sub-electrode,
wherein the n-type charge generation layer comprises an electron transport material and a n-type dopant, and the p-type charge generation layer comprises a hole transport material and a p-type dopant,
wherein the second light emitting unit comprises a second red light emitting layer on the first red light emitting layer, a second green light emitting layer on the first green light emitting layer; and a second blue light emitting layer on the first blue light emitting layer,
wherein the n-type charge generation layer is arranged on the first light emitting region, the second light emitting region, the third light emitting region, and the non-light emitting region,
wherein the p-type charge generation layer comprises a first p-type charge generation layer corresponding to the first light emitting region, a second p-type charge generation layer corresponding to the second light emitting region, and a third p-type charge generation layer corresponding to the third light emitting region, and the p-type charge generation layer is on the n-type charge generation layer, and
wherein a doping ratio of the p-type dopant is 2 wt % to 15 wt %.

14. The light emitting display device of claim 13 , wherein

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

• H10K59/12

  Active-matrix OLED [AMOLED] displays · CPC title

• H10K50/805 Primary

  Electrodes · CPC title

• H10K59/35 Primary

  comprising red-green-blue [RGB] subpixels · CPC title

• H10K50/15

  Hole transporting layers · CPC title

• H10K50/16

  Electron transporting layers · CPC title