Backlight module

• US 8,113,706 B2
• Filed: 06/24/2009
• Issued: 02/14/2012
• Est. Priority Date: 07/02/2008
• Status: Expired due to Fees

• Current Assignee: Chunghwa Picture Tubes Limited (Tatung Co., Ltd.)
• Original Assignee: Chunghwa Picture Tubes Limited (Tatung Co., Ltd.)
• Inventors: Lin, Hsiu-Yu
• Primary Examiner(s): Sawhney, Hargobind S
• Application Number:
  US12/457,857
• Publication Number:
  US 20100002418A1
• Time in Patent Office: 965 Days
• Field of Search: 362/33, 362/97.1, 362/97.2, 362/97.3, 362/367, 362/368, 362/373, 362/612, 362/613, 362/623, 362/633, 362/634, 349/58, 349/61, 349/62, 349/64, 349/65, 349/67, 349/70
• US Class Current: 362/633
• CPC Class Codes: G02B 6/0055 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0073 Light emitting diode [LED]
• 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: G02F 1/133615 Edge-illuminating devices, i.e. illuminating from the side
• CPC Class Codes: G02F 1/133628 with cooling means

Abstract

A backlight module, especially a side-edge type backlight module is disclosed. The backlight module comprises: a back plate having plural side walls, plural supporting elements locating on the connecting parts of the plural side walls, and a reflective sheet locating on the plural supporting elements. Therefore, an air space is maintained between the reflective sheet and the back plate of the backlight module. As a result, when the backlight module is operating, the heat produced by the light emitting units will not be transmitted to the reflective sheet of the backlight module during the operation. That is, even after long-term operation, the temperature of the reflective sheet of the backlight module can be maintained at a stable level.

Claims

1. A backlight module comprising:

a back plate, having plural side walls;

plural supporting elements, located on connecting parts of the plural side walls;

a reflective sheet, located on the plural supporting elements; and

a light emitting unit, located on one of the plural side walls.

2. The backlight module as claimed in claim 1, wherein the plural supporting elements are fixed to the side walls of the back plate, for fixing their position on the back plate.

3. The backlight module as claimed in claim 1, wherein each of the plural supporting elements is fixed on back plate by means of a screw.

4. The backlight module as claimed in claim 1, further comprising a heat guide sheet located on the back plate.

5. The backlight module as claimed in claim 4, wherein the heat guide sheet is sandwiched between the back plate and the reflective sheet.

6. The backlight module as claimed in claim 4, wherein the heat guide sheet is a graphite sheet.

7. The backlight module as claimed in claim 4, wherein the size of the heat guide sheet is the same as the size of the reflective sheet.

8. The backlight module as claimed in claim 1, wherein the light emitting unit is a light emitting diode light bar.

9. The backlight module as claimed in claim 8, wherein light emitting diode light bar includes plural light emitting diodes.

10. The backlight module as claimed in claim 1, further comprising an optical film set locating above the reflective sheet.