# US 12,181,703 B2 · Display device with light sources and display method thereof

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- Number: US 12,181,703 B2
- Document ID: US12181703B2
- Status: Granted
- Kind: B2
- Application number: 17/780,034
- Filed: 2022-05-18
- Published: 2023-10-26
- Granted: 2024-12-31
- Earliest claimed: 2022-04-20
- Assignees: Wuhan China Star Optoelectronics Technology Co., Ltd.
- Applicants: Wuhan China Star Optoelectronics Technology Co., Ltd.
- Inventors: Peng Zhang
- Web page: https://patentgrep.com/patent/US12181703B2

## CPC

- G02B 6/0055: {Reflecting element, sheet or layer}
- G02F 1/1336: {Illuminating devices}
- G02B 6/0021: {for housing at least a part of the light source, e.g. by forming holes or recesses}
- G02B 6/0025: {Diffusing sheet or layer; Prismatic sheet or layer}
- G02B 6/0068: {Arrangements of plural sources, e.g. multi-colour light sources}
- G02F 1/133514: {Colour filters}
- G02B 6/002: {by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces}
- G02F 1/133388: {with constructional differences between the display region and the peripheral region}
- G02F 1/133512: {Light shielding layers, e.g. black matrix (G02F1/136209 takes precedence)}
- G02F 1/133615: {Edge-illuminating devices, i.e. illuminating from the side}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- 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

A display device has a main display area and a function-adding area and includes a backlight module and a display panel. The backlight module includes an optical film set and light sources. The light sources are disposed on at least one end of the optical film set that is perpendicular to a light-emitting side of the backlight module, and include first light groups and second light groups. When the display device is in a functional mode, the first light groups are turned off, the second light groups are turned on, a first dark zone is formed on the optical film set, and the function-adding area is located within the first dark zone.

## Claims

### Claim 1

A display device, having a main display area and a function-adding area and comprising a backlight module and a display panel disposed on a light-emitting side of the backlight module, and the function-adding area is configured for sending and receiving channel of ambient light for an under-screen camera, wherein the backlight module comprises:
an optical film set comprising at least one optical film; and
a plurality of light sources disposed on at least one end of the optical film set that is perpendicular to the light-emitting side of the backlight module, wherein the light sources comprise first light groups and second light groups;
wherein edges of light-emitting surfaces of the second light groups adjacent to both sides of the first light groups meet at a vertex, an area of the optical film set surrounded by the edges of the light-emitting surfaces is defined as a first dark zone, and the function-adding area is located within the first dark zone; each of the first light groups is disposed between every adjacent two of the second light groups; a spacing is defined between each of the first light groups and one of the second light groups adjacent to the each of the first light groups, the spacing gradually decreases along a direction away from the function-adding area;
a light-emitting angle of the second light groups is greater than or equal to 90 degrees and is less than or equal to 120 degrees, and a light-emitting angle of the first light groups is greater than the light-emitting angle of the second light groups.

### Claim 2 (depends on 1)

The display device according to claim 1, wherein the first light groups and the second light groups are disposed at a same end of the optical film set, and the second light groups are arranged on both sides of the first light groups.

### Claim 3 (depends on 1)

The display device according to claim 1, wherein light-emitting angles of the second light groups arranged on the both sides of the first light groups are symmetrical about the function-adding area.

### Claim 4 (depends on 2)

The display device according to claim 2, wherein the light sources comprise third light groups, and the third light groups and the first light groups are disposed at two different ends of the optical film set, respectively.

### Claim 5 (depends on 1)

The display device according to claim 1, wherein the first light groups and the second light groups are disposed at a same end of the optical film set, the function-adding area is disposed at an intersection of two borders of the display device, the first light groups are disposed adjacent to the function-adding area, and the second light groups are disposed on one side of the first light groups.

### Claim 6 (depends on 5)

The display device according to claim 5, wherein a light-emitting angle of the first light groups is greater than a light-emitting angle of the second light groups.

### Claim 7 (depends on 5)

The display device according to claim 5, wherein the light sources comprise third light groups, and the third light groups and the first light groups are disposed at two different ends of the optical film set, respectively.

### Claim 8 (depends on 1)

The display device according to claim 1, wherein the first light groups and the second light groups are disposed at a same end of the optical film set.

### Claim 9 (depends on 8)

The display device according to claim 8, wherein the light sources comprise third light groups, and the third light groups and the first light groups are disposed at two different ends of the optical film set, respectively.

### Claim 10 (depends on 1)

The display device according to claim 1, wherein the display panel comprises an array substrate, a color filter substrate, and a liquid crystal layer, the liquid crystal layer is disposed between the array substrate and the color filter substrate, and the liquid crystal layer comprises a plurality of liquid crystal molecules; and
wherein a second dark zone is formed on the display panel, an orthographic projection of the first dark zone on the display panel is within the second dark zone, the liquid crystal molecules in the second dark zone are in a non-light-transmitting state, and the liquid crystal molecules in the function-adding area are in a light-transmitting state.

### Claim 11 (depends on 10)

The display device according to claim 10, further comprising a supplementary light source disposed in the function-adding area, wherein the supplementary light source is disposed on one side of the backlight module away from the display panel.

### Claim 12 (depends on 1)

The display device according to claim 1, wherein the at least one optical film comprises a light guide plate, and an area of the light guide plate corresponding to the function-adding area is formed with a through-hole.

### Claim 13 (depends on 12)

The display device according to claim 12, wherein the at least one optical film further comprises a reflective film, a diffusion film, and a brightness enhancement film, the reflective film is disposed on one side of the light guide plate away from the display panel, the diffusion film is disposed between the light guide plate and the display panel, and the brightness enhancement film is disposed between the diffusion film and the display panel; and
areas of the reflective film, the diffusion film, and the brightness enhancement film corresponding to the function-adding area are all formed with the through-hole.

### Claim 14 (depends on 1)

The display device according to claim 1, wherein the at least one optical film comprises a light guide plate, and a surface roughness of the light guide plate in the function-adding area is less than a surface roughness of the light guide plate in the main display area.

### Claim 15 (depends on 14)

The display device according to claim 14, wherein the at least one optical film further comprises a reflective film, a diffusion film, and a brightness enhancement film, the reflective film is disposed on one side of the light guide plate away from the display panel, the diffusion film is disposed between the light guide plate and the display panel, and the brightness enhancement film is disposed between the diffusion film and the display panel; and
areas of the reflective film, the diffusion film, and the brightness enhancement film corresponding to the function-adding area are all formed with a through-hole.

### Claim 16

A display method of a display device, comprising following steps:
providing a display device, wherein the display device has a main display area and a function-adding area and comprises a backlight module and a display panel disposed on a light-emitting side of the backlight module, the function-adding area is configured for sending and receiving channel of ambient light for an under-screen camera, the backlight module comprises an optical film set and light sources, the optical film set comprises at least one optical film, the light sources are disposed on at least one end of the optical film set that is perpendicular to the light-emitting side of the backlight module, and the light sources comprise first light groups and second light groups; each of the first light groups is disposed between every adjacent two of the second light groups; a spacing is defined between each of the first light groups and one of the second light groups adjacent to the each of the first light groups, the spacing gradually decreases along a direction away from the function-adding area; and
entering a functional mode, controlling the first light groups to be turned off, controlling the second light groups to be turned on, and forming a first dark zone on the optical film set, wherein the function-adding area is located within the first dark zone; edges of light-emitting surfaces of the second light groups adjacent to both sides of the first light groups meet at a vertex, an area of the optical film set surrounded by the edges of the light-emitting surfaces is defined as the first dark zone; a light-emitting angle of the second light groups is greater than or equal to 90 degrees and is less than or equal to 120 degrees, and a light-emitting angle of the first light groups is greater than the light-emitting angle of the second light groups.

### Claim 17 (depends on 16)

The display method of the display device according to claim 16, wherein the step of entering the functional mode further comprises:
controlling a second dark zone to be formed on the display panel, wherein an orthographic projection of the first dark zone on the display panel is within the second dark zone.