# US 2015/0146136 A1 · Side-light type backlight module

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- Number: US 2015/0146136 A1
- Document ID: US20150146136A1
- Status: Published application
- Kind: A1
- Application number: 14/509,401
- Filed: 2014-10-08
- Published: 2015-05-28
- Earliest claimed: 2013-11-28
- Assignees: Hon Hai Precision Industry Co., Ltd.
- Applicants: Hon Hai Precision Industry Co., Ltd.
- Inventors: SHAO-HAN CHANG
- Web page: https://patentgrep.com/patent/US20150146136A1

## CPC

- G02F 1/133308: {Support structures for LCD panels, e.g. frames or bezels}
- G02B 6/0001: {specially adapted for lighting devices or systems (lighting or signalling on vehicles using light guides B60Q1/00; lighting devices for vehicle dashboards B60Q3/10; lighting devices for vehicle interior using light guides B60Q3/62; lighting devices mounted on the vehicle rear part using light guides F21S43/235; measuring arrangements having light conducting pointers G01D13/265; illumination of liquid crystal displays G02F1/1336; illuminated signs G09F13/00)}
- G02B 6/0036: {2-D arrangement of prisms, protrusions, indentations or roughened surfaces}
- G02B 6/0065: {Manufacturing aspects; Material aspects}
- G02B 6/0088: {of the light guide or other optical sheets in the package}
- G02F 1/133314: {Back frames}
- G02F 1/133628: {with cooling means}
- 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
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A side-light type backlight module includes a front bezel, an optical film, a light guide plate, a box-shaped back cover, and a light source board. The optical film is positioned on the light guide plate. The back cover is connected to the front bezel, and the light guide plate is positioned in the back cover and integrated with the back cover by insert-molding. The back cover includes a bottom plate and a plurality of side walls perpendicular to the bottom plate, and the inner surfaces of the bottom plate and the plurality of side walls have high reflectivity. The bottom plate of the back cover defines a number of micro indentations.

## Claims

### Claim 1

A side-light type backlight module comprising:
a back cover having a bottom plate and a plurality of side walls extending substantially perpendicular to the bottom plate from the edges of the bottom plate to form a back cover cavity;
a light guide plate having an inner face and an outer face opposite to and substantially parallel to the inner face, the light guide plate positioned in the back cover cavity with the inner face toward the bottom plate;
a light source panel positioned in the back cover cavity;
an optical film positioned over the outer face of the light guide plate; and
a front bezel attached to the back cover and the optical film;
wherein, the bottom plate and each of the plurality of side walls have an inner surface facing the back cover cavity and the inner surfaces of the bottom plate and each of the side walls have high reflectivity; and
wherein, the inner surface of the bottom plate of the back cover includes a plurality of micro indentations.

### Claim 2 (depends on 1)

The side-light type backlight module as claimed in claim 1, wherein the plurality of micro indentations are uniformly distributed on the bottom plate, and each of the plurality of micro indentations is rectangular.

### Claim 3 (depends on 1)

The side-light type backlight module as claimed in claim 1, wherein the back cover is made of a metal.

### Claim 4 (depends on 1)

The side-light type backlight module as claimed in claim 1, wherein the plurality of the micro indentations are distributed randomly on the bottom plate.

### Claim 5 (depends on 1)

The side-light type backlight module as claimed in claim 1, wherein the front bezel defines a first groove and a second groove, the first groove partially receives the plurality of side walls, and the second groove partially receives the optical film.

### Claim 6 (depends on 1)

The side-light type backlight module as claimed in claim 1, wherein the front bezel defines a receiving portion, and the receiving portion is step-shaped.

### Claim 7 (depends on 1)

The side-light type backlight module as claimed in claim 1, wherein the light source panel is attached to at least one of the side walls.

### Claim 8 (depends on 1)

The side-light type backlight module as claimed in claim 1, wherein the light source panel comprises a plurality of light sources, the plurality of light sources are uniformly distributed on a surface of the light source panel.

### Claim 9 (depends on 8)

The side-light type backlight module as claimed in claim 8, wherein the light sources are light emitting diodes.

### Claim 10 (depends on 1)

The side-light type backlight module as claimed in claim 1, wherein the optical film comprises a first diffusion sheet, a first prism lens, a second prism lens, and a second diffusion sheet arranged on top of each other in that order.