Backlight module and display device having the same

• US 9,304,241 B2
• Filed: 12/03/2013
• Issued: 04/05/2016
• Est. Priority Date: 12/04/2012
• Status: Active Grant

• Current Assignee: Beijing BOE Display Technology Co Ltd (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Original Assignee: Beijing BOE Display Technology Co Ltd (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Inventors: Wang, Fei, Bu, Zhanchang
• Primary Examiner(s): Kim, Dennis Y
• Application Number:
  US14/095,380
• Publication Number:
  US 20140152940A1
• Time in Patent Office: 854 Days
• US Class Current: 1/1
• CPC Class Codes: G02B 6/0011 the light guides being planar or of plate-like form
• CPC Class Codes: G02B 6/0085 Means for removing heat created by the light source from the package heat extraction or cooling elements for semiconductor light sources in general H01L33/64
• CPC Class Codes: G02B 6/0088 of the light guide or other optical sheets in the package
• CPC Class Codes: G02F 1/133308 Support structures for LCD panels, e.g. frames or bezels
• CPC Class Codes: G02F 1/133314 Back frames
• CPC Class Codes: G02F 1/133628 with cooling means

Abstract

A backlight module includes: a frame; a backboard configured to support the frame; a radiator provided in the backboard and connected to an inner wall of the frame; a light source fixed to an inner wall of the radiator; a light guide plate relatively slidably mounted on the radiator and configured to guide light emitted by the light source; and at least one buffer mounted on the radiator and configured so that the radiator is moveable relative to the backboard against an elastic force of the buffer. The backlight module can effectively eliminate the phenomenon in which a shadow of the light source is present in pictures coming from the backlight module since the light guide plate presses against the light source after it is heated to expand. The present invention further provides a display device including the above backlight module.

Claims

1. A backlight module, including:

a frame;

a backboard directly connected to the frame to support the frame;

a radiator provided in the backboard and connected to an inner wall of the frame;

a light source fixed to an inner wall of the radiator;

a light guide plate relatively slidably mounted on the radiator and configured to guide light emitted by the light source;

at least one buffer mounted on the radiator,

wherein each buffer includes a bolt by which the radiator is provided on the backboard and a flexible gasket provided between a screw rod of the bolt and the radiator, a receiving hole for receiving the flexible gasket is provided in a portion of the radiator where the bolt is mounted, and

there is further provided a washer between a screw cap of the bolt and the radiator, and

a flexible pad provided between a vertical wall of the radiator and a vertical portion of the frame,

wherein the light guide plate is constructed to apply a pressing force on the light source when the light guide plate is expanded after being heated, the pressing force is transmitted to the radiator, the flexible pad and the flexible gasket is compressed and deformed by the radiator while the radiator is displaced with respect to the backboard and the light guide plate in a direction in which the light guide plate is expanded, so that a contraction of the flexible pad and the flexible gasket absorb the pressing force generated by a deformation of the light guide plate due to heat.

2. The backlight module according to claim 1, wherein the flexible gasket is made of silica gel or foam.

3. The backlight module according to claim 1, wherein the washer is made of ABS or nylon.

4. The backlight module according to claim 1, wherein the buffer is uniformly distributed on the radiator.

5. The backlight module according to claim 1, wherein the light source is fixed on the radiator by bolts.

6. The backlight module according to claim 1, wherein the radiator is made of aluminum.

7. The backlight module according to claim 1, wherein,

the backboard includes a first body and a first vertical wall extending vertically from a periphery of the first body;

the radiator includes a second body mounted on the first body and the vertical wall extending vertically from one edge of the second body; and

the vertical portion of the frame is clamped between the first vertical wall and the vertical wall.

8. The backlight module according to claim 7, wherein the receiving hole is formed in the second body of the radiator.

9. A display device, including:

a display screen; and

a backlight module, the display screen being supported on the frame of the backlight module and the backlight including;

a frame;

a backboard directly connection to the frame to support the frame;

a radiator provided in the backboard and connected to an inner wall of the frame;

a light source fixed to an inner wall of the radiator;

a light guide plate relatively slidably mouted on the radiator and configured to guide light emitted by the source;

at least one buffer mounted on the radiator,

wherein each buffer includes a bolt by which the radiator is provided on the backboard and a flexible gasket provided between a screw rod of the bolt and the radiator, a receiving hole of receiving the flexible gasket is provided in a portion of the radiator where the bolt is mounted, and

there is further provided a washer between a screw cap of the bolt and the radiator; and

a flexible pad provided between a vertical wall of the radiator and a vertical portion of the frame,

wherein the light guide plate is constructed to apply a pressing force on the light source when the light guide plate is expanded after being heated, the pressing force is transmitted to the radiator, the flexible pad and the flexible gasket is compressed and deformed by the radiator while the radiator is displaced with respect to the backboard and the light guide plate in a direction in which the light guide plate is expanded, so that a contraction of the flexible pad and the flexible gasket absorb the pressing force generated by a deformation of the light guide plate due to heat.

10. The display device according to claim 9, wherein the flexible gasket is made of silica gel or foam.

11. The display device according to claim 9, wherein the buffer is uniformly distributed on the radiator.

12. The display device according to claim 9, wherein,

the backboard includes first body and a first vertical wall extending vertically from a periphery of the first body;

the radiator includes a second body mounted on the first body and the vertical wall extending vertically from one edge of the second body; and

the vertical portion of the frame is clamped between the first vertical wall and the vertical wall.

13. The display device according to claim 12, wherein the receiving hole is formed in the second body of the radiator.