Backlight module and liquid crystal display having the same

Patent metadata

Field	Value
Publication number	US-9798187-B2
Application number	US-201514905172-A
Country	US
Kind code	B2
Filing date	Dec 22, 2015
Priority date	Nov 27, 2015
Publication date	Oct 24, 2017
Grant date	Oct 24, 2017

Abstract

A backlight module, having: a light source, a first light reflection portion located above the light source, and a second light reflection portion located below the light source; the first light reflection portion includes a groove concaved towards the light source; an inner surface of the groove includes a first reflection parabolic surface and a second reflection parabolic surface interconnected with each other and having a focal point at the light source; the first reflection parabolic surface performs horizontal reflection on the light emitted from the light source; the second reflection parabolic surface reflects the light emitted from the light source to the second light reflection portion; the second light reflection portion performs horizontal reflection on the light reflected thereto. A liquid crystal display having the backlight module is also disclosed.

First claim

The invention claimed is:

1. A backlight module, comprising: a light source, a first light reflection portion located above the light source, and a second light reflection portion located below the light source;
the first light reflection portion comprises a groove concaved toward the light source;
an inner surface of the groove comprises a first reflection parabolic surface and a second reflection parabolic surface interconnected with each other and having a focal point which is the light source;
the first reflection parabolic surface performs horizontal reflection on the light emitted from the light source, and the second reflection parabolic surface reflects the light emitted from the light source to the second light reflection portion;
the second light reflection portion performs horizontal reflection on the light reflected thereto;
wherein the inner surface of the groove further comprises a third reflection parabolic surface having a focal point which is the light source and connected with the first reflection parabolic surface;
the third reflection parabolic surface reflects the light emitted from the light source to the second reflection parabolic surface; the second reflection parabolic surface reflects the light, which is reflected from the third reflection parabolic surface to the second reflection parabolic surface, to the second light reflection portion;
the second light reflection portion performs horizontal reflection or diffuse reflection on the light reflected thereto.

2. The backlight module of claim 1 , wherein the second light reflection portion comprises: a bottom surface, a vertical surface extending perpendicularly upward from a side of the bottom surface, a first inclined surface extending obliquely upward from a side of the vertical surface, and a second inclined surface extending obliquely downward from a side of the first inclined surface, an angle between the first inclined surface and the bottom surface is an acute angle, an angle between the second inclined surface and the bottom surface is an obtuse angle, and the second inclined surface is used to reflect the light horizontally.

3. The backlight module of claim 2 , wherein the second light reflection portion comprises: an uneven surface extending from a side of the second inclined surface, which is used to perform diffuse reflection on the light.

4. The backlight module of claim 1 , wherein the first light reflection portion comprises:
a first flat plate and a second flat plate provided parallel with each other; wherein the second flat plate is positioned above the first flat plate, and one end of the first flat plate is aligned with one end of the second flat plate, and the other end of the second flat plate goes beyond the other end of the first flat plate;
a connecting member connecting the other end of the second flat plate and the other end of the first flat plate; wherein the connecting member has the groove concaved toward the light source.

5. The backlight module of claim 4 , wherein the connecting member extends to connect one end of the first flat plate and one end of the second flat plate.

6. The backlight module of claim 4 , wherein the third reflection parabolic surface, the first reflection parabolic surface and the second reflection parabolic surface are connected sequentially from the other end of the first flat plate to the other end of the second flat plate.

7. The backlight module of claim 5 , wherein the third reflection parabolic surface, the first reflection parabolic surface and the second reflection parabolic surface are connected sequentially from the other end of the first flat plate to the other end of the second flat plate.

8. The backlight module of claim 6 , wherein the backlight module further comprises a support portion;
the support portion comprises: a support plate, a vertical side plate extending vertically upward from a side of the support plate, and an inclined side plate extending obliquely upward from a side of the vertical side plate;
the other end of the first flat plate is connected to the vertical side plate, so that a connection portion between the third reflection parabolic surface and the other end of the first flat plate is positioned at a connection portion between the vertical side plate and the inclined side plate;
the inclined side plate and the support plate form an acute angle, and the light source is provided on the inclined side plate.

9. The backlight module of claim 7 , wherein the backlight module further comprises a support portion;
the support portion comprises: a support plate, a vertical side plate extending perpendicularly upward from a side of the support plate, and an inclined side plate extending obliquely upward from a side of the vertical side plate;
the other end of the first flat plate is connected to the vertical side plate, so that a connection portion between the third reflection parabolic surface and the other end of the first flat plate is positioned at a connection portion between the vertical side plate and the inclined side plate;
the inclined side plate and the support plate form an acute angle, and the light source is provided on the inclined side plate.

10. The backlight module of claim 8 , wherein an angle between the inclined side plate and the support plate is 45°.

11. The backlight module of claim 9 , wherein an angle between the inclined side plate and the support plate is 45°.

12. A liquid crystal display, comprising a backlight module and a liquid crystal panel provided opposite to each other, wherein the backlight module comprises: a light source, a first light reflection portion located above the light source, and a second light reflection portion located below the light source;
the first light reflection portion comprises a groove concaved toward the light source;
an inner surface of the groove comprises a first reflection parabolic surface and a second reflection parabolic surface interconnected with each other and having a focal point which is the light source;
the first reflection parabolic surface performs horizontal reflection on the light emitted from the light source, and the second reflection parabolic surface reflects the light emitted from the light source to the second light reflection portion;
the second light reflection portion performs horizontal reflection on the light reflected thereto;
wherein the inner surface of the groove further comprises a third reflection parabolic surface having a focal point which is the light source and connected with the first reflection parabolic surface;
the third reflection parabolic surface reflects the light emitted from the light source to the second reflection parabolic surface; the second reflection parabolic surface reflects the light, which is reflected from the third reflection parabolic surface to the second reflection parabolic surface, to the second light reflection portion;
the second light reflection portion performs horizontal reflection or diffuse reflection on the light reflected thereto.

Assignees

• Shenzhen China Star Optoelect

Inventors

• Qiu Yongyuan

Classifications

• G02F1/133605 Primary

  including specially adapted reflectors · CPC title

• G02F1/133608

  including particular frames or supporting means · CPC title

• G02F1/133603

  with LEDs · CPC title

• G02B6/0031

  Reflecting element, sheet or layer · CPC title

• F21V7/0008

  providing for indirect lighting · CPC title