Direct type backlight module

Patent metadata

Field	Value
Publication number	US-9223075-B2
Application number	US-201414496581-A
Country	US
Kind code	B2
Filing date	Sep 25, 2014
Priority date	Nov 8, 2013
Publication date	Dec 29, 2015
Grant date	Dec 29, 2015

Abstract

A backlight module includes a light guide assembly and a light source assembly. The light guide assembly includes a back cover, a reflective sheet, a light guide plate, and an optical film. The light source assembly includes a lamp cover, a light plate, and a plurality of light sources. The back cover and the reflective sheet define a first opening and a second opening. The light guide plate includes two prism shaped protrusion portions parallel to each other, and two surfaces of the two protrusion portions facing each other are a first incident portion and a second incident portion inclined to the light guide plate, and an area between the first incident surface and the second incident surface is third incident surface. The protrusion portions extend into the lamp cover, and the light source assembly is positioned below the third incident portion.

First claim

What is claimed is:

1. A backlight module comprising:
a light guide assembly comprising:
a back cover having a first opening;
a reflective sheet coupled to the back cover, the reflective sheet having a second opening overlapping with the first opening
a light guide plate including two prism shaped protrusion portions parallel and spaced apart from each other, the two protrusion shaped portions having a first incident portion and a second incident portion that face each other and are inclined relative to a central axis of the light guide plate;
an optical film mounted in the back cover, and
a plastic frame fixedly coupled to the back cover;

a light source assembly including a lamp cover, a light plate, and a plurality of light sources mounted on the light plate, and the light source assembly being positioned on the central portion of the light guide assembly; and
a third incident portion formed between the first incident portion and the second incident surface, wherein two prism shaped protrusion portions extend out of the back cover and extend into the lamp cover, and the light source assembly is positioned below the third incident portion.

2. The backlight module as claimed in claim 1 , wherein the protrusion portions are positioned in the central portion of the light guide plate, and the cross section of the protrusion portion is V-shaped.

3. The backlight module as claimed in claim 1 , wherein the protrusion portions are integrated with the light guide plate.

4. The backlight module as claimed in claim 1 , wherein the first opening and the second opening are formed in the central portion of the back cover and the reflective sheet and the first opening having a size and a shape that is the same as that of the second opening.

5. The backlight module as claimed in claim 1 , wherein the light source comprises a first light source pattern positioned in a long direction of the light plate, and a second light source pattern positioned in a short direction of the light plate.

6. The backlight module as claimed in claim 5 , wherein the first light source pattern is used as the main incident light source of the light guide plate, and the second light source pattern is used as the main incident light source of the light guide pipe.

7. The backlight module as claimed in claim 5 , wherein the light source assembly further comprises a bracket between the light sources and the light guide pipe, and the bracket is integrated with the light guide pipe of a material of high reflectance.

8. The backlight module as claimed in claim 5 , wherein two end surfaces of the light guide pipe in the long direction are inclined surfaces.

9. The backlight module as claimed in claim 8 , wherein the inclined surfaces are attached with a reflective film.

10. The backlight module as claimed in claim 1 , wherein the light source assembly further comprises a strip shaped thermal gasket attached in the lamp cover.

Assignees

• Hon Hai Prec Ind Co Ltd

Inventors

• Chang Shao-Han

Classifications

• G02B6/0055

  Reflecting element, sheet or layer · CPC title

• G02B6/0028

  Light guide, e.g. taper · CPC title

• G02B6/0031 Primary

  Reflecting element, sheet or layer · CPC title

• G02B6/0075

  Arrangements of multiple light guides (G02B6/0028 takes precedence) · CPC title