BACKLIGHT MODULE

• US 20070165420A1
• Filed: 11/16/2006
• Published: 07/19/2007
• Est. Priority Date: 01/13/2006
• Status: Active Grant

• Current Assignee: Coretronic Corporation
• Original Assignee: Coretronic Corporation
• Inventors: HWANG, PING-FENG, WENG, LIN-CHU, TSENG, KUN-MING
• Granted Patent: US 7,422,358 B2
• Time in Patent Office: Days
• US Class Current: 362/609
• CPC Class Codes: G02B 6/0031 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0046 Tapered light guide, e.g. wedge-shaped light guide
• CPC Class Codes: G02B 6/0055 Reflecting element, sheet or layer
• 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

Abstract

A backlight module including a light source, a light guide plate, a lamp reflector and a frame is provided. The light source is disposed at a first side of the light guide plate, and surrounded by the lamp reflector and the light guide plate. The lamp reflector includes a metal substrate and a reflective material layer, and the metal substrate includes a main body and an extended part. The extended part is connected to the main body and disposed under the light guide plate. The reflective material layer is disposed on the main body, and between the main body and the light source, and the light source is surrounded by the reflective material layer and the light guide plate. The light guide and the lamp reflector are disposed on the frame. The backlight module has a better heat dissipation efficiency and lower manufacturing cost.

Claims

1. A backlight module, comprising:

a light guide plate, having a first end and a second end corresponding to the first end;

a light source, disposed adjacent to the first end;

a lamp reflector, the light source surrounded by the lamp reflector and the light guide plate, the lamp reflector comprising;

a metal substrate, comprising a main body and an extended part, wherein the extended part is disposed under the light guide plate, a fixing end of the extended part is connected to the main body, a free end corresponding to the fixing end extends toward a direction away from the light source, and a distance exists between the free end and the second end of the light guide plate;

a reflective material layer, disposed on the main body and between the main body and the light source, wherein the light source is surrounded by the reflective material layer and the light guide plate; and

a frame, disposed under the lamp reflector.

2. The backlight module according to claim 1, wherein the main body and the extended part are integrally formed.

3. The backlight module according to claim 1, wherein a material of the metal substrate comprises aluminum, stainless steel or galvanized steel sheet.

4. The backlight module according to claim 1, wherein a material of the frame comprises plastic.

5. The backlight module according to claim 1, wherein the frame comprises a plurality of ribs and a plurality of heat dissipation openings arranged between the ribs, and the ribs are suitable for supporting the lamp reflector.

6. The backlight module according to claim 1, further comprising a reflection sheet, the light guide plate having a light emitting surface, the reflection sheet being arranged on a surface of the light guide plate corresponding to the light emitting surface, and the extended part of the metal substrate being suitable for supporting the reflection sheet.

7. The backlight module according to claim 1, wherein the extended part extended along a direction of the free end comprises a bending part which bends toward the light guide plate, and the bending part is near the fixing end.

8. A backlight module, comprising:

a light guide plate, having a first end and a second end corresponding to the first end;

two light sources, disposed adjacent to the first end and the second end, respectively;

two lamp reflectors, disposed adjacent to the first end and the second end, respectively, the light sources surrounded by the lamp reflectors and the light guide plate, each of the lamp reflectors comprising;

a metal substrate, comprising a main body and an extended part, wherein the extended part is disposed under the light guide plate, a fixing end of the extended part is connected to the main body, a free end is corresponding to the fixing end, and a distance exists between each of the free ends;

a reflective material layer, disposed on the main body and between the main body and the corresponding light source, wherein the light source is surrounded by the reflective material layers and the light guide plate; and

a frame, disposed under the lamp reflectors.

9. The backlight module according to claim 8, further comprising a reflection sheet, the light guide plate having a light emitting surface, the reflection sheet being arranged on a surface of the light guide plate corresponding to the light emitting surface, and the extended part of the metal substrate being suitable for supporting the reflection sheet.

10. The backlight module according to claim 8, wherein a material of the main body and the extended parts comprises metal.

11. The backlight module according to claim 8, wherein a material of the frame comprises plastic.

12. The backlight module according to claim 8, wherein the main body and the extended part of each of the metal substrate are integrally formed.

13. The backlight module according to claim 8, wherein the light sources are cathode cold fluorescent lamps.

14. The backlight module according to claim 8, wherein the extended part extended along a direction of the free end comprises a bending part which bends toward the light guide plate, and the bending part is near the fixing end.

15. The backlight module according to claim 8, wherein the frame comprises a plurality of ribs and a plurality of heat dissipation openings arranged between the ribs, and the ribs being suitable for supporting the lamp reflector.