# US 9,039,249 B2 · Backlight module

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- Number: US 9,039,249 B2
- Document ID: US9039249B2
- Status: Granted
- Kind: B2
- Application number: 14/067,977
- Filed: 2013-10-31
- Published: 2015-04-23
- Granted: 2015-05-26
- Earliest claimed: 2013-10-21
- Assignees: Hon Hai Precision Industry Co., Ltd.
- Applicants: Hon Hai Precision Industry Co., Ltd.
- Inventors: Po-Chou Chen
- Web page: https://patentgrep.com/patent/US9039249B2

## CPC

- G02B 6/003: {Lens or lenticular sheet or layer}
- G02B 6/002: {by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces}
- G02B 6/0036: {2-D arrangement of prisms, protrusions, indentations or roughened surfaces}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A backlight module includes a laser light source, a light guiding board located at a side of the laser light source, a first lens and a second lens both located at a light path of light beams emitted from the laser light source. The laser light source includes one laser diode or a plurality of laser diodes. The light guiding board includes a light incident face and a light emerging face. The first lens firstly converges and then diverges the light beams emitted from the laser light source. The second lens changes the light beams passed through the first lens to be parallel light beams. The parallel light beams have a larger width than that of the light beams just emitted from the laser light source. The parallel light beams enter the light guiding board via the light incident face of the light guiding board.

## Claims

### Claim 1

A backlight module, comprising:
a laser light source comprising one laser diode or a plurality of laser diodes;
a light guiding board located at a side of the laser light source, the light guiding board comprising a light incident face and a light emerging face; and
a first lens and a second lens both located at a light path of light beams emitted from the laser light source, the first lens firstly converging and then diverging the light beams emitted from the laser light source, the second lens changing the light beams passed through the first lens to be parallel light beams, the parallel light beams having a larger width than that of the light beams just emitted from the laser light source, the parallel light beams entering the light guiding board via the light incident face of the light guiding board.

### Claim 2 (depends on 1)

The backlight module of claim 1, wherein the first lens is a planar-convex cylindrical lens.

### Claim 3 (depends on 2)

The backlight module of claim 2, wherein the first lens comprises a first convex cylinder face and a first plane opposite to the first convex cylinder face, the first convex cylinder face facing the laser light source, the first plane facing the second lens.

### Claim 4 (depends on 1)

The backlight module of claim 1, wherein the second lens is a planar-convex cylindrical lens.

### Claim 5 (depends on 4)

The backlight module of claim 4, wherein the second lens comprises a second convex cylinder face and a second plane opposite to the second convex cylinder face, the second plane facing the first lens.

### Claim 6 (depends on 5)

The backlight module of claim 5, wherein the second convex cylinder face of the second lens faces the light incident face of the light guiding board.

### Claim 7 (depends on 6)

The backlight module of claim 6, wherein the first lens and the second lens are located between the laser light source and the light incident face of the light guiding board.

### Claim 8 (depends on 5)

The backlight module of claim 5 further comprising a light deflecting prism, wherein deflecting prism comprises a light incident face and a light exiting face, the second convex cylinder face of the second lens facing the light incident face of the light deflecting prism, the light exiting face of the light deflecting prism facing the light incident face of the light guiding board.

### Claim 9 (depends on 1)

The backlight module of claim 1, wherein the light incident face of the light guiding board is perpendicular to the light emerging face of the light guiding board.

### Claim 10 (depends on 1)

The backlight module of claim 1, wherein the light guiding board further comprises a light reflecting face opposite to the light incident face of the light guiding board.

### Claim 11 (depends on 10)

The backlight module of claim 10, wherein the light reflecting face of the light guiding board forms a plurality of projecting ribs projecting outwardly.

### Claim 12 (depends on 11)

The backlight module of claim 11, wherein the projecting ribs are spaced from each other.

### Claim 13 (depends on 11)

The backlight module of claim 11, wherein each of the projecting ribs has an arced cross section.

### Claim 14 (depends on 1)

The backlight module of claim 1, wherein the laser light source emits red light beams, green light beams and blue light beams.

### Claim 15 (depends on 1)

The backlight module of claim 1, wherein the second lens is larger than the first lens in size.