IP Library › Granted Patent US 10,873,057

Granted Patent B2

US 10,873,057 · App. 16/212,533 · Granted Dec 22, 2020

Electroluminescence display apparatus

Inventors: JunHo Youn (Paju-si, KR); Heumell Baek (Paju-si, KR)

Assignee: LG Display Co., Ltd.

H01L51/5278 H01L27/322 H01L27/3211 H01L27/3223 H01L27/3246 H01L51/504 H01L51/5056 H01L51/5072 H01L51/5092 H01L2251/558

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Quick Facts

Patent No.: US 10,873,057
App. No.: 16/212,533
Granted: Dec 22, 2020
Kind: B2

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Abstract

An electroluminescence display includes a substrate, a bank defining a first light emitting area, a second light emitting area, and a third light emitting area on the substrate, a first light emitting layer provided in the first light emitting area, a second light emitting layer provided in the second light emitting area, a third light emitting layer provided in the third light emitting area, and a fourth light emitting layer provided on the first light emitting layer, the second light emitting layer, the third light emitting layer, and the bank, wherein the fourth light emitting layer emits light having the same color light of the third light emitting layer. If red light is emitted from the first light emitting layer, green light is emitted from the second light emitting layer, and blue light is emitted from the third light emitting layer and the fourth light emitting layer, the luminous efficiency of blue light can be improved.

Claims (91)

1. An electroluminescence display apparatus comprising:

a substrate including an active area and a dummy area provided on an outer side of the active area;

a bank on the substrate, the bank defining a first light emitting area, a second light emitting area, and a third light emitting area of the substrate;

a first light emitting layer provided in the first light emitting area, the first light emitting layer configured to emit light of a first color;

a second light emitting layer provided in the second light emitting area, the second light emitting layer configured to emit light of a second color;

a third light emitting layer provided in the third light emitting area, the third light emitting layer configured to emit light of a third color;

a fourth light emitting layer provided on the first light emitting layer, the second light emitting layer, the third light emitting layer, and the bank; and

an electrode covering and contacting the fourth light emitting layer, the electrode overlapping the active area and the dummy area,

wherein the fourth light emitting layer is configured to emit light of the third color that is also emitted by the third light emitting layer,

wherein the electrode covers and contacts the dummy light emitting layer,

wherein the fourth light emitting layer is provided in the active area without being provided in the dummy area, and

wherein the dummy light emitting layer includes a first dummy light emitting layer, a second dummy light emitting layer, and a third dummy light emitting layer, the first dummy light emitting layer has a same structure as that of the first light emitting layer, the second dummy light emitting layer has a same structure as that of the second light emitting layer, and the third dummy light emitting layer has a same structure as that of the third light emitting layer.

2. The electroluminescence display apparatus of claim 1 , wherein

a thickness of the first light emitting layer is greater than a thickness of the second light emitting layer and a thickness of the third light emitting layer, and the thickness of the second light emitting layer is greater than the thickness of the third light emitting layer, and

the fourth light emitting layer comprises a substantially uniform thickness in the first light emitting area, the second light emitting area, and the third light emitting area.

3. The electroluminescence display apparatus of claim 1 , wherein

the first light emitting layer comprises a first hole transporting layer and a first light emitting material layer configured to emit light of the first color, wherein the first color is red,

the second light emitting layer comprises a first hole transporting layer and a second light emitting material layer configured to emit light of the second color, wherein the second color is green,

the third light emitting layer comprises a first hole transporting layer and a third light emitting material layer configured to emit light of the third color, wherein the third color is blue, and

the fourth light emitting layer comprises at least one of a first electron injecting layer and a first electron transporting layer, a charge generation layer, a second hole transporting layer, a fourth light emitting material layer configured to emit light of the third color, and a second electron transporting layer.

4. The electroluminescence display apparatus of claim 1 , wherein

the first light emitting layer comprises a first hole transporting layer, a first light emitting material layer configured to emit light of the first color, wherein the first color is red, and at least one of a first electron injecting layer and a first electron transporting layer,

the second light emitting layer comprises a first hole transporting layer, a second light emitting material layer configured to emit light of the second color, wherein the second color is green, and at least one of a first electron injecting layer and a first electron transporting layer,

the third light emitting layer comprises a first hole transporting layer, a third light emitting material layer configured to emit light of the third color, wherein the third color is blue, and at least one of a first electron injecting layer and a first electron transporting layer, and

the fourth light emitting layer comprises a charge generation layer, a second hole transporting layer, a fourth light emitting material layer configured to emit light of the third color, and a second electron transporting layer.

5. The electroluminescence display apparatus of claim 1 , further comprising:

a first color filter overlapping the first light emitting layer; and

a second color filter overlapping the second light emitting layer,

wherein each of the first color filter and the second color filter at least partially block transmission of light emitted from the fourth light emitting layer.

6. The electroluminescence display apparatus of claim 1 , further comprising:

a first color conversion material overlapping the first light emitting layer and a second color conversion material overlapping the second light emitting layer,

wherein the first color conversion material converts light emitted from the fourth light emitting layer having the third color into the first color, and

the second color conversion material converts light emitted from the fourth light emitting layer having the third color into the second color.

7. The electroluminescence display apparatus of claim 1 , further comprising:

a first color conversion material overlapping the first light emitting layer, a first color filter overlapping the first color conversion material, a second color conversion material overlapping the second light emitting layer, and a second color filter overlapping the second color conversion material,

wherein the first color conversion material converts light emitted from the fourth light emitting layer having the third color into the first color, and

the second color conversion material converts light emitted from the fourth light emitting layer having the third color into the second color of light emitted from the second light emitting layer.

8. The electroluminescence display apparatus of claim 1 , wherein

a thickness of a first portion of the first light emitting layer at a center of the first light emitting area is less than a thickness of a second portion of the first light emitting layer that is in contact with the bank.

9. The electroluminescence display apparatus of claim 1 , further comprising:

an additional electrode provided below the first light emitting layer, the second light emitting layer, and the third light emitting layer;

and

a capping layer provided on the electrode.

10. An electroluminescence display apparatus comprising:

a substrate including an active area and a dummy area provided on an outer side of the active area;

a bank on the substrate, the bank defining a plurality of light emitting areas in the active area on the substrate and defining a plurality of dummy light emitting areas in the dummy area on the substrate, wherein the plurality of light emitting areas are configured to emit light and the plurality of dummy light emitting areas do not emit light;

a first light emitting layer, a second light emitting layer, and a third light emitting layer respectively provided in the plurality of light emitting areas, the first light emitting layer configured to emit light of a first color, the second light emitting layer configured to emit light of a second color, and the third light emitting layer configured to emit light of a third color;

a fourth light emitting layer on the first light emitting layer, the second light emitting layer, the third light emitting layer, and the bank in the active area, the fourth light emitting layer configured to emit light of the third color that is also emitted by the third light emitting layer;

a dummy light emitting layer provided in each of the plurality of dummy light emitting areas; and

an electrode covering and contacting each of the fourth light emitting layer and the dummy light emitting layer, the electrode overlapping the active area and the dummy area,

wherein the fourth light emitting layer is provided in the plurality of light emitting areas without being provided in the dummy area, and

11. The electroluminescence display apparatus of claim 10 , further comprising:

a first color filter overlapping the first light emitting layer and a second color filter overlapping the second light emitting layer in the active area,

wherein each of the first color filter and the second color filter at least partially block transmission of light emitted from the fourth light emitting layer.

12. The electroluminescence display apparatus of claim 11 , wherein the first color filter and the second color filter are not provided in the dummy area.

13. The electroluminescence display apparatus of claim 10 , further comprising:

a first color conversion material overlapping the first light emitting layer and a second color conversion material overlapping the second light emitting layer in the active area,

wherein the first color conversion material converts light emitted from the fourth light emitting layer having the third color into the first color, and

the second color conversion material converts light emitted from the fourth light emitting layer having the third color into the second color.

14. The electroluminescence display apparatus of claim 13 , wherein the first color conversion material and the second color conversion material are not provided in the dummy area.

15. The electroluminescence display apparatus of claim 10 , wherein

the first light emitting layer comprises a first hole transporting layer and a first light emitting material layer configured to emit light of the first color, wherein the first color is red,

the second light emitting layer comprises a first hole transporting layer and a second light emitting material layer configured to emit light of the second color, wherein the second color is green,

the third light emitting layer comprises a first hole transporting layer and a third light emitting material layer configured to emit light of the third color, wherein the third color is blue, and

16. The electroluminescence display apparatus of claim 10 , wherein

17. A display device, comprising:

a substrate including an active area and a dummy area provided on an outer side of the active area; and

a plurality of pixels arranged on the substrate, at least one pixel including:

a first subpixel configured to emit light of a first color;

a second subpixel configured to emit light of a second color;

a third subpixel configured to emit light of a third color; and

a fourth subpixel overlapping the first subpixel, the second subpixel, and the third subpixel, wherein the fourth subpixel is configured to emit light that is of a same color as one of the first subpixel, the second subpixel, or the third subpixel, and

an electrode covering and contacting the fourth subpixel, the electrode overlapping the active area and the dummy area,

wherein the electrode covers and contacts the dummy light emitting layer,

wherein the fourth light emitting layer is provided in the active area without being provided in the dummy area, and

18. The display device of claim 17 , wherein the fourth subpixel emits light of the third color.

19. The display device of claim 17 ,

wherein a first light emitting area of the first subpixel, a second light emitting area of the second subpixel, and a third light emitting area of the third subpixel are defined by a bank, and

wherein a size of the first light emitting area, a size of the second light emitting area, and a size of the third light emitting area are substantially the same.

20. The display device of claim 17 , further comprising:

a first color filter overlapping the first subpixel and the fourth subpixel;

a second color filter overlapping the second subpixel and the fourth subpixel; and

a third color filter overlapping the third subpixel and the fourth subpixel,

wherein each of the first color filter and the second color filter at least partially block transmission of light emitted from the fourth subpixel.

Assignments (1)

ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Dec 7, 2018

From: YOUN, JUNHO; BAEK, HEUMEIL

To: LG DISPLAY CO., LTD.

Reel/Frame 048918/0728 →

Priority Claims (1)

KR 10-2017-0172048 · Dec 14, 2017 · national

Continuity (1)

Related Publication 20190189969A1 · Jun 20, 2019

Cited By (1)

US 12,349,547