# US 9,435,935 B2 · Light guide plate, backlight module and display device

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- Number: US 9,435,935 B2
- Document ID: US9435935B2
- Status: Granted
- Kind: B2
- Application number: 14/079,832
- Filed: 2013-11-14
- Published: 2014-05-15
- Granted: 2016-09-06
- Earliest claimed: 2012-11-15
- Assignees: Boe Technology Group Co., Ltd.
- Applicants: Boe Technology Group Co., Ltd.
- Inventors: Shanshan Zhou
- Web page: https://patentgrep.com/patent/US9435935B2

## CPC

- G02B 6/0061: {to provide homogeneous light output intensity}
- G02B 6/0038: {Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide}
- G02B 6/0068: {Arrangements of plural sources, e.g. multi-colour light sources}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A light guide plate for the edge-lit backlight module comprises a first recessed portion and a second recessed portion. The first recessed portion is provided at the bottom of a light incident end of the light guide plate for accommodating a light source. The second recessed portion is provided at the top of the light incident end of the light guide plate, corresponding to the first recessed portion.

## Claims

### Claim 1

A light guide plate for an edge-lit backlight module comprises a first recessed portion and a second recessed portion, wherein the first recessed portion is provided at a bottom of a light incident end of the light guide plate for accommodating a light source, and the second recessed portion is provided at a top of the light incident end of the light guide plate, corresponding to the first recessed portion, the light guide plate has a light incident surface at the light incident end, a light exit surface perpendicular to the light incident surface and a third surface perpendicular to the light incident surface and opposite to the light exit surface, the first recessed portion is formed at the light incident surface and the third surface, and the second recessed portion is formed at the light exit surface,
wherein, in a direction perpendicular to the light exit surface, a sum of a depth of the first recessed portion and a depth of the second recessed portion is larger than a maximal thickness of the light guide plate.

### Claim 2 (depends on 1)

The light guide plate of claim 1, wherein a light converging structure is provided at a bottom surface of the first recessed portion.

### Claim 3 (depends on 2)

The light guide plate of claim 2, wherein the light converging structure is a spherical cap structure.

### Claim 4 (depends on 3)

The light guide plate of claim 3, wherein the second recessed portion is a cone having an apex adjacent to the apex of the spherical cap structure at the bottom surface of the first recessed portion.

### Claim 5 (depends on 4)

The light guide plate of claim 4, wherein the base of the second recessed portion has a radius larger than or equal to a radius of the spherical cap structure at the bottom surface of the first recessed portion.

### Claim 6 (depends on 1)

The light guide plate of claim 1, wherein the light source is a light emitting diode light source.

### Claim 7 (depends on 6)

The light guide plate of claim 6, wherein the thickness of the light emitting diode light source is 0.4 mm to 1.2 mm, the light guide plate has a thickness of 4 mm to 8 mm, the second recessed portion is a cone having an apex adjacent to the first recessed portion and a base parallel to a bottom surface of the light guide plate, an apex angle of the second recessed portion ranges from 125° to 130°.

### Claim 8 (depends on 1)

A backlight module including the light guide plate according to claim 1.

### Claim 9 (depends on 8)

A display device including the backlight module according to claim 8.

### Claim 10 (depends on 1)

The light guide plate of claim 1, wherein the second recessed portion is a cone having an apex adjacent to the first recessed portion and a base parallel to a bottom surface of the light guide plate.

### Claim 11 (depends on 1)

The light guide plate of claim 1, wherein the first recessed portion is formed to have an accommodation space larger than the volume of a light source to be located.

### Claim 12 (depends on 1)

The light guide plate of claim 1, wherein, the second recessed portion is further formed at the light incident surface.