# US 10,873,057 B2 · Electroluminescence display apparatus

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- Number: US 10,873,057 B2
- Document ID: US10873057B2
- Status: Granted
- Kind: B2
- Application number: 16/212,533
- Filed: 2018-12-06
- Published: 2019-06-20
- Granted: 2020-12-22
- Earliest claimed: 2017-12-14
- Assignees: LG Display Co., Ltd.
- Applicants: LG Display Co., Ltd.
- Inventors: JunHo Youn; Heumell Baek
- Web page: https://patentgrep.com/patent/US10873057B2

## CPC

- H10K 59/88: Dummy elements, i.e. elements having non-functional features
- H10K 50/13: comprising stacked EL layers within one EL unit
- H10K 50/15: Hole transporting layers
- H10K 50/16: Electron transporting layers
- H10K 50/17: Carrier injection layers
- H10K 50/171: {Electron injection layers}
- H10K 50/19: Tandem OLEDs
- H10K 59/122: Pixel-defining structures or layers, e.g. banks
- H10K 59/35: comprising red-green-blue [RGB] subpixels
- H10K 59/38: comprising colour filters or colour changing media [CCM]
- H10K 59/12: Active-matrix OLED [AMOLED] displays
- H10K 59/876: {comprising a resonant cavity structure, e.g. Bragg reflector pair}
- H10K 2102/351: {Thickness}
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## 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

### Claim 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.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 1)

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.

### Claim 4 (depends on 1)

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.

### Claim 5 (depends on 1)

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.

### Claim 6 (depends on 1)

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.

### Claim 7 (depends on 1)

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.

### Claim 8 (depends on 1)

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.

### Claim 9 (depends on 1)

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.

### Claim 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
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.

### Claim 11 (depends on 10)

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.

### Claim 12 (depends on 11)

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

### Claim 13 (depends on 10)

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.

### Claim 14 (depends on 13)

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.

### Claim 15 (depends on 10)

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
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.

### Claim 16 (depends on 10)

The electroluminescence display apparatus of claim 10, 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.

### Claim 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
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.

### Claim 18 (depends on 17)

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

### Claim 19 (depends on 17)

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.

### Claim 20 (depends on 17)

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.