LED backlight module and the corresponding liquid crystal display

Patent metadata

Field	Value
Publication number	US-9389356-B2
Application number	US-201314122676-A
Country	US
Kind code	B2
Filing date	Oct 18, 2013
Priority date	Oct 9, 2013
Publication date	Jul 12, 2016
Grant date	Jul 12, 2016

Abstract

The present invention discloses a LED backlight module, which comprises a backplane; a side-type backlight source, which comprises a backlight source substrate and multiple light emitting diodes provided on the backlight light source substrate; a reflector, which is provided on the backplane; multiple light guides provided on the reflector in parallel, each light guide being provided with at least one light-incident surface and one light-emitting surface, the light-incident surface of the light guide being opposite to the LED; diffusers provided on the multiple light guides, which are opposite to the light-emitting surface of the light guide; and an optical film set, which is located above the diffuser. The embodiment of the present invention further discloses the corresponding liquid crystal display. According to the embodiment of the present invention, it can save the amount of LEDs, which is beneficial for the narrow frame of the liquid crystal display panel.

First claim

What is claimed is:

1. A light-emitting diode (LED) backlight module, comprising:
a backplane having a horizontal plate and a vertical plate extending from the horizontal plate;
a side-type backlight source, which comprises a backlight source substrate and multiple LEDs provided on the backlight source substrate;
a reflector, which is provided on the horizontal plate of the backplane;
multiple light guides provided on the reflector and parallel with each other, each light guide being provided with at least one light-incident surface and one light-emitting surface, the light-incident surface of the light guide being opposite to one of the LEDs of the side-type backlight source, the light guide transforming spot light emitted from the LED of the side-type backlight source into line light, which is transmitted out from the light-emitting surface;
a diffuser, which is provided above the multiple light guides and opposite to the light-emitting surface of each light guide; and
an optical film set, which is located above the diffuser;
wherein the LEDs of the side-type backlight source that are mounted on the backlight source substrate are spaced from each other and respectively corresponding to the light guides so that the LEDs are separate from and respectively corresponding to the light-incident surfaces of the light guides; and
wherein the diffuser is supported on a step formed in the vertical plate and spaced from the horizontal plate such that the diffuser is spaced from the light-emitting surfaces of the light guides by a light mixing distance.

2. The LED backlight module as claimed in claim 1 , wherein the light guide is a cuboid structure, the light-incident surface of each light guide is located on at least one end surface of the cuboid, the light-emitting surface is the upper surface of the cuboid, the upper surface of the cuboid is a plane or a prism structure parallel to the longitudinal direction of the cuboid; the multiple light guides are provided with an interval.

3. The LED backlight module as claimed in claim 2 , wherein the side-type backlight source is provided on an inner wall of the vertical plate, and wherein the end surface of each of the light guides facing the side-type backlight source provided on the inner wall of the vertical plate is the light-incident surface and the end surface away from the side-type backlight source is affixed with a reflective film.

4. The LED backlight module as claimed in claim 2 , wherein the backplane comprises two vertical plates in parallel, the inner wall of each vertical plate is provided with the side-type backlight source, two ends of the light guide are provided as the light-incident surface, which respectively face the two side-type backlight sources.

5. The LED backlight module as claimed in claim 3 , wherein the bottom of each light guide is provided with multiple lattice points, the lattice points are used to reflect the spot light from the LED of the side-type backlight source to the light-emitting surface of the light guide and then transmit out.

6. The LED backlight module as claimed in claim 5 , wherein the lattice points are obtained by printing or injection molding, the lattice points are selected from the groups consisting of concave lattice points, convex lattice points, printing lattice points and V-shaped cutting groove lattice points.

7. The LED backlight module as claimed in claim 6 , wherein there is an interval between the two adjacent light guides.

8. A light-emitting diode (LED) backlight module, comprising:
a backplane having a horizontal plate and a vertical plate extending from the horizontal plate;
a side-type backlight source, which comprises a backlight source substrate and multiple LEDs provided on the backlight source substrate;
a reflector, which is provided on the horizontal plate of the backplane;
multiple light guides provided on the reflector and parallel with each other, each light guide being provided with at least one light-incident surface and one light-emitting surface, the light-incident surface of the light guide being opposite to one of the LEDs of the side-type backlight source, the light guide transforming spot light emitted from the LED of the side-type backlight source into line light, which is transmitted out from the light-emitting surface;
a diffuser, which is provided above the multiple light guides and opposite to the light-emitting surface of each light guide; and
an optical film set, which is located above the diffuser;
wherein the light guide is a cuboid structure, the light-incident surface of each light guide is located on at least one end surface of the cuboid, the light-emitting surface is the upper surface of the cuboid, the upper surface of the cuboid is a plane or a prism structure parallel to the longitudinal direction of the cuboid, the bottom of each light guide is provided with multiple lattice points, the lattice points are used to reflect the spot light from the LED of the side-type backlight source to the light-emitting surface of the light guide and then transmit out;
wherein the LEDs of the side-type backlight source that are mounted on the backlight source substrate are spaced from each other and respectively corresponding to the light guides so that the LEDs are separate from and respectively corresponding to the light-incident surfaces of the light guides; and
wherein the diffuser is supported on a step formed in the vertical plate and spaced from the horizontal plate such that the diffuser is spaced from the light-emitting surfaces of the light guides by a light mixing distance.

9. The LED backlight module as claimed in claim 8 , wherein the side-type backlight source is provided on an inner wall of the vertical plate, and wherein the end surface of the light guide facing the side-type backlight source provided on the inner wall of the vertical plate is the light-incident surface and the end surface away from the side-type backlight source is affixed with a reflective film.

10. The LED backlight module as claimed in claim 9 , wherein the backplane comprises two vertical plates in parallel, the inner wall of each vertical plate is provided with the side-type backlight source, two ends of the light guide are provided as the light-incident surface, which respectively face the two side-type backlight sources.

11. The LED backlight module as claimed in claim 9 , wherein the lattice points are obtained by printing or injection molding, the lattice points are selected from the groups consisting of concave lattice points, convex lattice points, printing lattice points and V-shaped cutting groove lattice points.

12. The LED backlight module as claimed in claim 11 , wherein there is an interval between the two adjacent light guides.

13. A liquid crystal display, comprising a light-emitting diode (LED) backlight module, which comprises:
a backplane having a horizontal plate and a vertical plate extending from the horizontal plate;
a side-type backlight source, which comprises a backlight source substrate and multiple LEDs provided on the backlight source substrate;
a reflector, which is provided on the horizontal plate of the backplane;
multiple light guides provided on the reflector and parallel with each other, each light guide being provided with at least one light-incident surface and one light-emitting surface, the light-incident surface of the light guide being opposite to one of the LEDs of the side-type backlight source, the light guide transforming spot light emitted from the LED of the side-type backlight source into line light, which is transmitted out from the light-emitting surface;
a diffuser, which is provided abov

Assignees

• Shenzhen China Star Optoelect
• Shenzhen China Star Optoelect

Inventors

• He Hu

Classifications

• G02B6/0051

  Diffusing sheet or layer · CPC title

• G02B6/0036

  2-D arrangement of prisms, protrusions, indentations or roughened surfaces · CPC title

• G02B6/0075 Primary

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

• G02B6/0061

  to provide homogeneous light output intensity · CPC title