Backlight module with a heat conductive block

• US 8,194,208 B2
• Filed: 09/13/2010
• Issued: 06/05/2012
• Est. Priority Date: 12/23/2005
• Status: Active Grant

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Wu, Meng-chai, Lo, Chi-chung, Hsieh, Chin-kun, Lai, Cheng-chih, Cheng, Chi-chen
• Primary Examiner(s): Robinson, Mark
• Assistant Examiner(s): Arendt, Paisley L
• Application Number:
  US12/881,145
• Publication Number:
  US 20110007521A1
• Time in Patent Office: 631 Days
• Field of Search: 349/58, 349 60- 62, 349/65, 349/161, 362/612, 362/631, 362/632
• US Class Current: 349/65
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21V 29/87 Organic material, e.g. filled polymer composites; Thermo-conductive additives or coatings therefor
• CPC Class Codes: F21V 29/89 Metals
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02F 1/133628 with cooling means

Abstract

A backlight module includes a bezel having at least one edge, a circuit board, one or more light emitting diodes connected to the circuit board for emitting light. Each light emitting diode has a light axis which is neither parallel nor vertical to the edge of the bezel. The backlight module utilizes a heat conductive block disposed between the bezel and the light emitting diode for transferring heat generated by the light emitting diode to the bezel.

Claims

1. A backlight module for use in an LCD, comprising:

a metal bezel having a bottom surface, a first edge surface perpendicular to the bottom surface, a second edge surface perpendicular to the bottom surface and the first edge surface, and a corner jointing the bottom surface, the first edge surface and the second edge surface;

a heat conductive block disposed at the corner;

a flexible circuit board disposed on the second edge surface of the metal bezel and the heat conductive block, wherein the flexible circuit board comprises a first surface and a second surface opposite to the first surface, and the second surface faces to the first edge surface and the second edge surface and contacts with the heat conductive block; and

a light emitting diode disposed on the flexible circuit board and corresponding to the heat conductive block, and contacting with the first surface of the flexible circuit board.

2. The backlight module of claim 1, wherein the light emitting diode comprises a light axis neither parallel nor perpendicular to the first edge surface and the second edge surface of the metal bezel.

3. The backlight module of claim 1, wherein the heat conductive block, the flexible circuit board, and the metal bezel are adhered with a high polymer having high thermal conductivity.

4. The backlight module of claim 1, wherein the heat conductive block is attached to the metal bezel.

5. The backlight module of claim 1, wherein the heat conductive block directly contacts the bottom surface, the first edge surface, or the second edge surface.

6. A backlight module for use in an LCD, comprising:

a metal bezel having a first edge surface, a second edge surface perpendicular to the first edge surface, and a bottom surface connecting the first edge surface and the second edge surface;

a heat conductive block connecting a first area of the first edge surface;

a flexible circuit board having a first portion connecting the heat conductive block and a second portion laid on a second area of the second edge surface, wherein the flexible circuit board comprises a first surface and a second surface opposite to the first surface, and the second surface faces to the first edge surface and the second edge surface and contacts with the heat conductive block; and

a light emitting diode disposed on the first portion of the flexible circuit board and contacting with the first surface of the flexible circuit board, wherein the first portion of the flexible circuit board is connected between the heat conductive block and the light emitting diode, and the light emitting diode comprises a light axis neither parallel nor perpendicular to the first edge and the second edge of the bezel.

7. The backlight module according to claim 6, wherein the heat conductive block connects the second area of the second edge surface.

8. The backlight module according to claim 6, wherein the heat conductive block connects a contact area of the bottom surface.

9. The backlight module according to claim 6, wherein the second portion is parallel to the second area.

10. A backlight module for use in an LCD, comprising:

a metal bezel having a first edge surface, a second edge surface perpendicular to the first edge surface, and a bottom surface connecting the first edge surface and the second edge surface;

a heat conductive block connecting a contact area of the bottom surface;

a flexible circuit board having a first portion connecting the heat conductive block and a second portion laid on a second area of the second edge surface, wherein the flexible circuit board comprises a first surface and a second surface opposite to the first surface, and the second surface faces to the first edge surface and the second edge surface and contacts with the heat conductive block; and

a light emitting diode disposed on the first portion of the flexible circuit board and contacting with the first surface of the flexible circuit board, wherein the first portion of the flexible circuit board is connected between the heat conductive block and the light emitting diode, and the light emitting diode comprises a light axis neither parallel nor perpendicular to the first edge and the second edge of the bezel.

11. The backlight module according to claim 10, wherein the heat conductive block connects a first area of the first edge surface neither parallel nor vertical to the first portion.

12. A backlight module for use in an LCD, comprising:

a metal bezel having a first edge surface, a second edge surface perpendicular to the first edge surface, and a bottom surface connecting the first edge surface and the second edge surface;

a heat conductive block connecting a second area of the second edge surface;

a flexible circuit board having a first portion connecting the heat conductive block and a second portion laid on the second area of the second edge surface, wherein the flexible circuit board comprises a first surface and a second surface opposite to the first surface, and the second surface faces to the first edge surface and the second edge surface; and

a light emitting diode disposed on the first portion of the flexible circuit board and the light emitting diode contacting with the first surface, wherein the first portion of the flexible circuit board is connected between the heat conductive block and the light emitting diode, and the light emitting diode comprises a light axis neither parallel nor perpendicular to the first edge and the second edge of the bezel.

13. A backlight module for use in an LCD, comprising:

a metal bezel having a bottom surface, a first edge surface perpendicular to the bottom surface, and a second edge surface perpendicular to the bottom surface and the first edge surface;

a flexible circuit board disposed on the metal bezel, wherein the flexible circuit board comprises a first surface and a second surface opposite to the first surface, and the second surface faces to the first edge surface and the second edge surface;

a light emitting diode contacting with the first surface and disposed on the flexible circuit board for generating light; and

a heat conductive block contacting with the second surface, for transferring heat generated by the light emitting diode,

wherein a space surrounded by the first edge surface, the second edge surface, and the flexible circuit board fits the heat conductive block.

14. The backlight module of claim 13, wherein the heat conductive block contacts to the first edge surface, the second edge surface, and the flexible circuit board.

15. The backlight module of claim 13, wherein the flexible circuit board is perpendicular to the bottom surface.