# US 10,481,428 B2 · Display substrate and display device

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- Number: US 10,481,428 B2
- Document ID: US10481428B2
- Status: Granted
- Kind: B2
- Application number: 15/787,888
- Filed: 2017-10-19
- Published: 2018-09-06
- Granted: 2019-11-19
- Earliest claimed: 2017-03-01
- Assignees: Boe Technology Group Co., Ltd.; Hefei Xinsheng Optoelectronics Technology Co., Ltd.
- Applicants: Boe Technology Group Co., Ltd.; Hefei Xinsheng Optoelectronics Technology Co., Ltd.
- Inventors: Liangliang Jiang; Chengpeng Yao; Ke Dai; Yongjun Yoon
- Web page: https://patentgrep.com/patent/US10481428B2

## CPC

- G02F 1/133514: {Colour filters}
- G02F 1/133617: {Illumination with ultraviolet light; Luminescent elements or materials associated to the cell}
- G02F 1/133621: {providing coloured light (G02F1/133617, G02F1/133533 take precedence)}
- G02F 1/133603: {with LEDs}
- G02F 1/133609: {including means for improving the color mixing, e.g. white}
- G02F 1/133614: {using photoluminescence, e.g. phosphors illuminated by UV or blue light}
- G02F 1/133624: {characterised by their spectral emissions}
- G02F 1/1362: Active matrix addressed cells {(G02F1/134336, G02F1/134363 take precedence)}
- G02F 1/136222: {Colour filters incorporated in the active matrix substrate}
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS

## Abstract

The present disclosure provides a display substrate and a display device. Each pixel unit includes: a blue sub-pixel, a transparent color filter layer being arranged in the blue subpixel and configured to allow a blue light beam to be transmitted therethrough toward the display substrate; a red subpixel, a red fluorescent powder layer being arranged in the red subpixel and configured to emit a red light beam under the excitation of the blue light beam; a green subpixel, a green fluorescent powder layer being arranged in the green subpixel and configured to emit a green light beam under the excitation of the blue light beam; and a yellow subpixel, a yellow fluorescent powder layer being arranged in the yellow subpixel and configured to emit a yellow light beam under the excitation of the blue light beam.

## Claims

### Claim 1

A display substrate, comprising a plurality of pixel units and a protection layer covering the plurality of pixel units, wherein each pixel unit comprises:
a blue subpixel; a transparent color filter layer being arranged in the blue subpixel and configured to allow a blue light beam to be transmitted therethrough toward the display substrate;
a red subpixel; a red fluorescent powder layer being arranged in the red subpixel and configured to emit a red light beam under the excitation of the blue light beam;
a green subpixel; a green fluorescent powder layer being arranged in the green subpixel and configured to emit a green light beam under the excitation of the blue light beam; and
a yellow subpixel; a yellow fluorescent powder layer being arranged in the yellow subpixel and configured to emit a yellow light beam under the excitation of the blue light beam;
wherein the transparent color filter layer arranged in the blue subpixel is formed integrally with the protection layer.

### Claim 2 (depends on 1)

The display substrate according to claim 1, wherein a transparent color filter layer is further arranged in the red subpixel, and the transparent color filter layer and the red fluorescent powder layer are arranged one on another; or the red fluorescent powder layer is made of a transparent color filter layer doped with a red fluorescent powder.

### Claim 3 (depends on 2)

The display substrate according to claim 2, wherein the red fluorescent powder layer or the red fluorescent powder is made of Ru-doped Y2O3.

### Claim 4 (depends on 1)

The display substrate according to claim 1, wherein a transparent color filter layer is further arranged in the green subpixel, and the transparent color filter layer and the green fluorescent powder layer are arranged one on another; or the green fluorescent powder layer is made of a transparent color filter layer doped with a green fluorescent powder.

### Claim 5 (depends on 4)

The display substrate according to claim 4, wherein the green fluorescent powder layer or the green fluorescent powder is made of Ru-doped SrGa2S4.

### Claim 6 (depends on 1)

The display substrate according to claim 1, wherein a transparent color filter layer is further arranged in the yellow subpixel, and the transparent color filter layer and the yellow fluorescent powder layer are arranged one on another; or the yellow fluorescent powder layer is made of a transparent color filter layer doped with a yellow fluorescent powder.

### Claim 7 (depends on 6)

The display substrate according to claim 6, wherein the yellow fluorescent powder is made of Ce-doped (Y1-aGda)3(Al1-bGab)O12.

### Claim 8 (depends on 1)

The display substrate according to claim 1, wherein the transparent color filter layer is made of transparent resin, polymethyl methacrylate or polycarbonate.

### Claim 9 (depends on 1)

The display substrate according to claim 1, wherein the display substrate is a color filter substrate or a color filter on array (COA) substrate.

### Claim 10 (depends on 1)

A display device, comprising the display substrate according to claim 1 and a blue backlight source arranged at a light-entering side of the display substrate.

### Claim 11 (depends on 10)

The display device according to claim 10, wherein the blue backlight source is a blue-light Light-Emitting Diode (LED) chip.

### Claim 12 (depends on 10)

The display device according to claim 10, wherein a blue light beam from the blue backlight source has a wavelength of (440±30) nm.

### Claim 13 (depends on 12)

The display device according to claim 12, wherein a red light beam emitted by the red subpixel under the excitation of the blue light beam has a wavelength of (700±30) nm.

### Claim 14 (depends on 12)

The display device according to claim 12, wherein a green light beam emitted by the green subpixel under the excitation of the blue light beam has a wavelength of (530±30) nm.

### Claim 15 (depends on 12)

The display device according to claim 12, wherein a yellow light beam emitted by the yellow subpixel under the excitation of the blue light beam has a wavelength of (580±30) nm.