# US 11,910,688 B2 · Organic light emitting diode display substrate having band gap layer, manufacturing method thereof, and display device

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- Number: US 11,910,688 B2
- Document ID: US11910688B2
- Status: Granted
- Kind: B2
- Application number: 17/742,194
- Filed: 2022-05-11
- Published: 2022-09-01
- Granted: 2024-02-20
- Earliest claimed: 2018-11-29
- Assignees: Boe Technology Group Co., Ltd.
- Applicants: Boe Technology Group Co., Ltd.
- Inventors: Guang Yan; Changyen Wu; Li Sun; Juanjuan You; Chengyuan Luo; Ling Wang; Dongfang Yang
- Web page: https://patentgrep.com/patent/US11910688B2

## CPC

- H10K 59/38: comprising colour filters or colour changing media [CCM]
- H10K 59/875: {Arrangements for extracting light from the devices}
- H10K 59/1201: {Manufacture or treatment}
- H10K 2102/3026: {Top emission}
- H10K 2102/351: {Thickness}
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

An organic light emitting diode display substrate includes a light emitting unit layer, a first band gap layer and a color conversion layer. The first band gap layer and the color conversion layer are on a light exit path of the light emitting unit layer. The light emitting unit layer includes first, second and third light emitting units periodically arranged on a driving substrate and emitting light of a first color. The color conversion layer converts a part of the light of the first color into light of a second color and a third color. The first band gap layer is between the light emitting unit layer and the color conversion layer. The first band gap layer transmits the light of the first color in a light exit direction, and reflects the light of the second color and the light of the third color.

## Claims

### Claim 1

An organic light emitting diode display substrate, comprising:
a light emitting unit layer;
a first band gap layer; and
a color conversion layer,
wherein the first band gap layer and the color conversion layer are on a light exit path of the light emitting unit layer,
wherein the light emitting unit layer comprises a first light emitting unit, a second light emitting unit, and a third light emitting unit periodically arranged on a driving substrate and configured to emit light of a first color,
wherein the color conversion layer is configured to convert a part of the light of the first color into light of a second color and light of a third color, respectively,
wherein the first band gap layer is between the light emitting unit layer and the color conversion layer and overlaps the second light emitting unit and the third light emitting unit, and
wherein the first band gap layer comprises a stacked structure layer, the stacked structure layer comprises a first inorganic layer, a first organic layer, and a second inorganic layer stacked in sequence, and a refractive index of any one of the first inorganic layer, the first organic layer, and the second inorganic layer is in a range of 1.3 to 2.4.

### Claim 2 (depends on 1)

The organic light emitting diode display substrate according to claim 1,
wherein the color conversion layer comprises a second color conversion unit on a light exit path of the second light emitting unit and is configured to convert the light of the first color into the light of the second color, and a third color conversion unit on a light exit path of the third light emitting unit and is configured to convert the light of the first color into the light of the third color.

### Claim 3 (depends on 2)

The organic light emitting diode display substrate according to claim 2, further comprising:
a color filter layer on a light exit path of the second color conversion unit and the third color conversion unit,
wherein the color filter layer is configured to transmit the light of the second color and the light of the third color in a light exit direction and absorb the light of the first color.

### Claim 4 (depends on 3)

The organic light emitting diode display substrate according to claim 3,
wherein the color filter layer comprises a second filter unit and a third filter unit,
wherein the second filter unit corresponds to a position of the second color conversion unit, and is configured to transmit the light of the second color in the light exit direction and absorb the light of the first color, and
wherein the third filter unit corresponds to a position of the third color conversion unit, and is configured to transmit the light of the third color in the light exit direction and absorb the light of the first color.

### Claim 5 (depends on 2)

The organic light emitting diode display substrate according to claim 2, wherein the color conversion layer further comprises a first color conversion unit configured to transmit the light of the first color emitted from the first light emitting unit.

### Claim 6 (depends on 2)

The organic light emitting diode display substrate according to claim 2, further comprising:
a second band gap layer on a light exit path of the second color conversion unit and the third color conversion unit,
wherein the second band gap layer is configured to transmit the light of the second color and the light of the third color in a light exit direction and reflect the light of the first color in a direction opposite to the light exit direction.

### Claim 7 (depends on 6)

The organic light emitting diode display substrate according to claim 6,
wherein the second band gap layer is on a planarization layer on the second color conversion unit and the third color conversion unit, and comprises a second band gap unit and a third band gap unit,
wherein the second band gap unit corresponds to a position of the second color conversion unit, and is configured to transmit the light of the second color in the light exit direction and reflect the light of the first color in the direction opposite to the light exit direction, and
wherein the third band gap unit corresponds to a position of the third color conversion unit, and is configured to transmit the light of the third color in the light exit direction and reflect the light of the first color in the direction opposite to the light exit direction.

### Claim 8 (depends on 2)

The organic light emitting diode display substrate according to claim 2,
wherein the first band gap layer is a stacked structure layer,
wherein the stacked structure layer comprises three to five sequentially stacked dielectric layers, and
wherein refractive indexes of adjacent dielectric layers of the sequentially stacked dielectric layers are different from each other.

### Claim 9 (depends on 1)

The organic light emitting diode display substrate according to claim 1, wherein the first band gap layer further overlaps the first light emitting unit.

### Claim 10 (depends on 1)

The organic light emitting diode display substrate according to claim 1, further comprising:
a protective layer on a side of the first light emitting unit, the second light emitting unit, and the third light emitting unit facing the first band gap layer.

### Claim 11 (depends on 1)

The organic light emitting diode display substrate according to claim 1,
wherein the light of the first color comprises blue light, and
wherein the color conversion layer comprises a quantum dot conversion layer.

### Claim 12 (depends on 1)

A display device comprising the organic light emitting diode display substrate according to claim 1.

### Claim 13

An organic light emitting diode display substrate, comprising:
a light emitting unit layer;
a color conversion layer; and
a second band gap layer,
wherein the color conversion layer and the second band gap layer are on a light exit path of the light emitting unit layer,
wherein the light emitting unit layer comprises a first light emitting unit, a second light emitting unit, and a third light emitting unit periodically arranged on a driving substrate and configured to emit light of a first color,
wherein the color conversion layer is configured to convert a part of the light of the first color into light of a second color and light of a third color, respectively,
wherein the second band gap layer is on a side of the color conversion layer away from the light emitting unit layer, and
wherein the second band gap layer comprises a stacked structure layer, the stacked structure layer comprises a first inorganic layer, a first organic layer, and a second inorganic layer stacked in sequence, and a refractive index of any one of the first inorganic layer, the first organic layer, and the second inorganic layer is in a range of 1.3 to 2.4.

### Claim 14 (depends on 13)

The organic light emitting diode display substrate according to claim 13,
wherein the color conversion layer comprises a second color conversion unit on a light exit path of the second light emitting unit and is configured to convert the light of the first color into the light of the second color, and
wherein a third color conversion unit on a light exit path of the third light emitting unit is configured to convert the light of the first color into the light of the third color.

### Claim 15 (depends on 14)

The organic light emitting diode display substrate according to claim 14, wherein the second band gap layer is on a planarization layer on the second color conversion unit and the third color conversion unit, and comprises a second band gap unit and a third band gap unit,
wherein the second band gap unit corresponds to a position of the second color conversion unit, and is configured to transmit the light of the second color in a light exit direction and reflect the light of the first color in a direction opposite to the light exit direction,
wherein the third band gap unit corresponds to a position of the third color conversion unit, and is configured to transmit the light of the third color in the light exit direction and reflect the light of the first color in the direction opposite to the light exit direction,
wherein the second band gap unit has a transmittance of ≥80% for the light of the second color and a reflectivity of ≥85% for the light of the first color, and
wherein the third band gap unit has a transmittance of ≥80% for the light of the third color and a reflectivity of ≥85% for the light of the first color.

### Claim 16 (depends on 13)

The organic light emitting diode display substrate according to claim 13,
wherein the second band gap layer is one of a photonic band gap layer or a stacked structure layer,
wherein a thickness of the photonic band gap layer is 0.5 μm to 2.0 μm,
wherein a thickness of the stacked structure layer is 0.5 μm to 10.0 μm,
wherein the stacked structure layer comprises three to five sequentially stacked dielectric layers, and
wherein refractive indexes of adjacent dielectric layers of the sequentially stacked dielectric layers are different from each other.

### Claim 17 (depends on 13)

The organic light emitting diode display substrate according to claim 13,
wherein the light of the first color comprises blue light, and
wherein the color conversion layer comprises a quantum dot conversion layer.

### Claim 18 (depends on 13)

A method for manufacturing the organic light emitting diode display substrate according to claim 13, comprising:
forming the light emitting unit layer that is configured to emit light of the first color; and
forming the color conversion layer and the second band gap layer.

### Claim 19

A method for manufacturing an organic light emitting diode display substrate, comprising:
forming a light emitting unit layer that is configured to emit light of a first color, the light emitting unit layer comprising a first light emitting unit, a second light emitting unit, and a third light emitting unit periodically arranged on a driving substrate; and
forming a first band gap layer and a color conversion layer,
wherein the first band gap layer is between the light emitting unit layer and the color conversion layer and overlaps the second light emitting unit and the third light emitting unit,
wherein the color conversion layer is configured to convert a part of the light of the first color into light of a second color and light of a third color, respectively, and
wherein the first band gap layer comprises a stacked structure layer forming a two-dimensional photonic crystal structure, the stacked structure layer comprises a first inorganic layer, a first organic layer, and a second inorganic layer stacked in sequence, and a refractive index of any one of the first inorganic layer, the first organic layer, and the second inorganic layer is in a range of 1.3 to 2.4.

### Claim 20 (depends on 19)

The method according to claim 19, further comprising:
forming a second band gap layer,
wherein the second band gap layer is on a side of the color conversion layer away from the light emitting unit layer, and
wherein the second band gap layer is configured to transmit the light of the second color and the light of the third color in a light exit direction and reflect the light of the first color in a direction opposite to the light exit direction.