# US 11,910,686 B2 · Array substrate, method for preparing array substrate, display panel and display apparatus

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- Number: US 11,910,686 B2
- Document ID: US11910686B2
- Status: Granted
- Kind: B2
- Application number: 17/414,546
- Filed: 2020-12-29
- Published: 2023-11-09
- Granted: 2024-02-20
- Earliest claimed: 2020-03-16
- Assignees: Boe Technology Group Co., Ltd.
- Applicants: BOE Technology Group Co., Ltd.
- Inventors: Juanjuan You; Guang Yan; Linlin Wang
- Web page: https://patentgrep.com/patent/US11910686B2

## CPC

- H10K 59/38: comprising colour filters or colour changing media [CCM]
- H10K 59/875: {Arrangements for extracting light from the devices}
- H10K 59/877: {comprising scattering means}
- H10K 59/879: {comprising refractive means, e.g. lenses}
- H10K 71/00: Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K 2102/331: {Nanoparticles used in non-emissive layers, e.g. in packaging layer}
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

An array substrate is disclosed and includes: a base substrate (1); an excitation light source (2) on a side of the base substrate (1); and a sub pixel on a side of the excitation light source (2) facing away from the base substrate (1). The sub pixel at least includes a first-kind sub pixel (3). The first-kind sub pixel (3) includes a first quantum dot conversion layer (31), a first recycling component layer (32) and a first color film layer (33) sequentially located on the side of the excitation light source (2) facing away from the base substrate (1), and the first recycling component layer (32) is configured to limit at least part of light with a wavelength smaller than a wavelength of emergent light of the first-kind sub pixel (3) into the first recycling component layer (32) and the first quantum dot conversion layer (31).

## Claims

### Claim 1

An array substrate, comprising:
a base substrate;
an excitation light source on a side of the base substrate; and
a sub pixel on a side, facing away from the base substrate, of the excitation light source;
wherein the sub pixel at least comprises:
a first-kind sub pixel;
wherein the first-kind sub pixel comprises:
a first quantum dot conversion layer, a first recycling component layer and a first color film layer sequentially located on the side, facing away from the base substrate, of the excitation light source;
wherein the first recycling component layer is configured to limit at least part of light with a wavelength, smaller than a wavelength of emergent light of the first-kind sub pixel, into the first quantum dot conversion layer;
a refractive index of the first recycling component layer is equal to a refractive index of the first color film layer;
in a wave band smaller than the wavelength of the emergent light of the first-kind sub pixel, a refractive index of the first quantum dot conversion layer is greater than the refractive index of the first recycling component layer; and
in a wave band greater than or equal to the wavelength of the emergent light of the first-kind sub pixel, the refractive index of the first quantum dot conversion layer is smaller than the refractive index of the first recycling component layer.

### Claim 2 (depends on 1)

The array substrate according to claim 1, wherein the first-kind sub pixel is a red sub pixel and/or a green sub pixel.

### Claim 3 (depends on 2)

The array substrate according to claim 2, wherein the first quantum dot conversion layer comprises:
red quantum dots and scattering particles; and/or
green quantum dots and the scattering particles.

### Claim 4 (depends on 1)

The array substrate according to claim 1, wherein the sub pixel further comprises:
a second-kind sub pixel;
wherein the second-kind sub pixel comprises:
a scattering layer, a planarization layer and a second color film layer sequentially located on the side, facing away from the base substrate, of the excitation light source; and
wherein a wavelength of emergent light of the second-kind sub pixel is smaller than the wavelength of the emergent light of the first-kind sub pixel.

### Claim 5 (depends on 4)

The array substrate according to claim 4, wherein:
a refractive index of the scattering layer is smaller than or equal to a refractive index of the planarization layer; and
the refractive index of the planarization layer is smaller than or equal to a refractive index of the second color film layer.

### Claim 6 (depends on 4)

The array substrate according to claim 4, wherein:
the first quantum dot conversion layer is arranged on a layer same as the scattering layer;
the first recycling component layer is arranged on a layer same as the planarization layer; and
the first color film layer is arranged on a layer same as the second color film layer.

### Claim 7 (depends on 4)

The array substrate according to claim 4, wherein a thickness of the first-kind sub pixel is equal to a thickness of the second-kind sub pixel in a direction perpendicular to the base substrate.

### Claim 8 (depends on 4)

The array substrate according to claim 4, wherein the second-kind sub pixel is a blue sub pixel.

### Claim 9 (depends on 4)

The array substrate according to claim 4, wherein the excitation light source is configured to emit white light or blue light.

### Claim 10 (depends on 1)

A method for preparing the array substrate according to claim 1, comprising:
providing a base substrate;
forming an excitation light source on the base substrate; and
forming a first-kind sub pixel on a side of a light emergent surface of the excitation light source;
wherein the first-kind sub pixel comprises a first quantum dot conversion layer, a first recycling component layer and a first color film layer sequentially located on the excitation light source.

### Claim 11 (depends on 10)

The method according to claim 10, further comprising:
forming a second-kind sub pixel on the side of the light emergent surface of the excitation light source;
wherein an orthographic projection of the second-kind sub pixel on the base substrate is not overlapped with an orthographic projection of the first-kind sub pixel on the base substrate; and
the second-kind sub pixel comprises a scattering layer, a planarization layer and a second color film layer sequentially located on the excitation light source.

### Claim 12 (depends on 1)

A display panel, comprising the array substrate according to claim 1, and an encapsulation cover plate on a side of a light emergent surface of the array substrate.

### Claim 13 (depends on 12)

A display apparatus, comprising the display panel according to claim 12, and a protective shell surrounding the display panel.

### Claim 14

An array substrate, comprising:
a base substrate;
an excitation light source on a side of the base substrate; and
a sub pixel on a side, facing away from the base substrate, of the excitation light source;
wherein the sub pixel at least comprises:
a first-kind sub pixel;
wherein the first-kind sub pixel comprises:
a first quantum dot conversion layer, a first recycling component layer and a first color film layer sequentially located on the side, facing away from the base substrate, of the excitation light source;
wherein the first recycling component layer is configured to limit at least part of light with a wavelength, smaller than a wavelength of emergent light of the first-kind sub pixel, into the first quantum dot conversion layer;
a refractive index of the first quantum dot conversion layer is equal to a refractive index of the first recycling component layer;
in a wave band smaller than a wavelength of the emergent light of the first-kind sub pixel, the refractive index of the first recycling component layer is greater than a refractive index of the first color film layer; and
in a wave band greater than or equal to the wavelength of the emergent light of the first-kind sub pixel, the refractive index of the first recycling component layer is smaller than the refractive index of the first color film layer.

### Claim 15 (depends on 14)

The array substrate according to claim 14, wherein the first-kind sub pixel is a red sub pixel and/or a green sub pixel.

### Claim 16 (depends on 15)

The array substrate according to claim 15, wherein the first quantum dot conversion layer comprises:
red quantum dots and scattering particles; and/or
green quantum dots and the scattering particles.

### Claim 17 (depends on 14)

The array substrate according to claim 14, wherein the sub pixel further comprises:
a second-kind sub pixel;
wherein the second-kind sub pixel comprises:
a scattering layer, a planarization layer and a second color film layer sequentially located on the side, facing away from the base substrate, of the excitation light source; and
wherein a wavelength of emergent light of the second-kind sub pixel is smaller than the wavelength of the emergent light of the first-kind sub pixel.

### Claim 18 (depends on 17)

The array substrate according to claim 17, wherein:
a refractive index of the scattering layer is smaller than or equal to a refractive index of the planarization layer; and
the refractive index of the planarization layer is smaller than or equal to a refractive index of the second color film layer.

### Claim 19 (depends on 17)

The array substrate according to claim 17, wherein:
the first quantum dot conversion layer is arranged on a layer same as the scattering layer;
the first recycling component layer is arranged on a layer same as the planarization layer; and
the first color film layer is arranged on a layer same as the second color film layer.

### Claim 20 (depends on 17)

The array substrate according to claim 17, wherein a thickness of the first-kind sub pixel is equal to a thickness of the second-kind sub pixel in a direction perpendicular to the base substrate.