Light source module and backlight system using the same

• US 20070189015A1
• Filed: 08/23/2006
• Published: 08/16/2007
• Est. Priority Date: 02/10/2006
• Status: Active Grant

• Current Assignee: Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. (Hon Hai Precision Industry Co., Ltd.), Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Hon Hai Precision Industry Co., Ltd.
• Inventors: Chen, Fen, Chang, Shao-Han
• Granted Patent: US 7,600,908 B2
• Time in Patent Office: Days
• US Class Current: 362/341
• CPC Class Codes: F21V 29/74 with fins or blades
• CPC Class Codes: F21V 29/76 with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133611 including means for improving the brightness uniformity

Abstract

A light source module includes at least a light source and a housing. The housing includes a base having a slanted reflective surface, a plurality of sidewalls extending out of a peripheral of the base cooperatively defining an opening with the base, the sidewall aligned with a trough of the slanted reflective surface having an inner surface and an outer surface opposite to the inner surface, and a plurality of fin structures formed on the outer surface of the sidewall. The light source is fixed on the inner surface of the sidewall. Light rays emitted from the light source being reflected at the slanted reflective surface toward the opening. A backlight system using the light source module is also provided. The present backlight system has a good heat dissipation capability due to an employment of the present light source module, and can be configured to be a thin body.

Claims

1. A light source module comprising:

at least a light source; and

a housing having;

a base having a slanted reflective surface; and

a plurality of sidewalls extending out of a peripheral of the base cooperatively defining an opening with the base, the sidewall aligned with a trough of the slanted reflective surface having an inner surface facing the slanted reflective surface and an outer surface opposite to the inner surface, the light source being fixed on the inner surface, and a plurality of fin structures formed on the outer surface of the sidewall, light rays emitted from the light source being reflected at the slanted reflective surface toward the opening.

2. The light source module according to claim 1, wherein the slanted reflective surface is configured to be one of a curved surface, a slanted flat surface, a stepped surface or a combination thereof.

3. The light source module according to claim 1, wherein the inner surface of the sidewall where the light source is fixed, is slanted with respect to a horizontal portion of a base.

4. The light source module according to claim 3, wherein an inclination angle defined by the inner surface of the sidewall that fixes the light source thereon with respect to the base is configured to be in a range from about 30 degrees to about 150 degrees.

5. The light source module according to claim 1, wherein the housing further comprises an upper reflective portion positioned on a top of the sidewall where the light source is fixed, the upper reflective unit having a first protruding portion extending perpendicularly from a top the sidewall towards an inner area of the base and a second protruding portion extending from an interior portion of the first protruding portion towards the base, the first protruding portion and the second protruding portion cooperatively forming a second reflective surface facing a slanted reflective surface of the base.

6. The light source module according to claim 1, wherein the housing further comprises a bottom reflective unit positioned on the base adjacent to the sidewall that fixes the light source thereon, the bottom reflective unit having a third protruding portion extending from the base toward the opening of the housing, the third protruding portion and the base cooperatively forming a third reflective surface interconnecting the slanted reflective surface.

7. The light source module according to claim 1, wherein the light source is selected from one of light emitting diode and cold cathode fluorescent lamp.

8. The light source module according to claim 1, wherein a material of the housing is selected from a group comprising of aluminum, magnesium, copper or their alloys.

9. The light source module according to claim 1, wherein the housing further comprises a first heat dissipation layer and an aluminum based printed circuit board sandwiched between the light source and the inner surface of the sidewall.

10. The light source module according to claim 9, wherein the housing further comprises a second heat conductive layer sandwiched between the aluminum base printed circuit board and the light source.

11. The light source module according to claim 1, wherein the housing further comprises a highly reflective film deposited on the slanted reflective surface of the base.

12. A backlight system comprising:

a light diffusion plate; and

at least a light source module disposed under the light diffusion plate, each light source module having;

at least a light source; and

a housing having a base having a slanted reflective surface, a plurality of sidewalls extending out of a peripheral of the base cooperatively defining an opening with the base, the sidewall aligned with a trough of the slanted reflective surface having an inner surface facing the slanted reflective surface and an outer surface opposite to the inner surface, the light source being fixed on the inner surface, and a plurality of fin structures formed on the outer surface of the sidewall, light rays emitted from the light source being reflected at the slanted reflective surface toward the opening.

13. The backlight system according to claim 12, wherein the slanted reflective surface is configured to be one of a curved surface, a slanted flat surface, a stepped surface or a combination thereof.

14. The backlight system according to claim 12, wherein the inner surface of the sidewall where the light source is fixed, is slanted with respect to the base.

15. The backlight system according to claim 12, wherein the housing further comprises an upper reflective portion positioned on a top of the sidewall where the light source is fixed, the upper reflective unit having a first protruding portion extending perpendicularly from a top the sidewall towards an inner area of the base and a second protruding portion extending from an interior portion of the first protruding portion towards the base, the first protruding portion and the second protruding portion cooperatively forming a second reflective surface facing a slanted reflective surface of the base.

16. The backlight system according to claim 12, wherein the housing further comprises a bottom reflective unit positioned on the base adjacent to the sidewall that fixes the light source thereon, the bottom reflective unit having a third protruding portion extending from the base toward the opening of the housing, the third protruding portion and the base cooperatively forming a third reflective surface interconnecting the slanted reflective surface.

17. The backlight system according to claim 12, wherein the backlight system comprises two same light source module disposed under the light diffusion plate, the two light source module being back to back of each other, such that each sidewall where the light source is fixed is disposed at an adjacent the edge of the light diffusion plate.

18. A backlight system comprising:

a housing including a housing base and a plurality of housing sidewalls integrally extending from an periphery of the housing base thus forming an upper opening of the housing, the housing base having a slanted upper reflective surface rising from one of the sidewalls toward an opposing one of the sidewalls;

a first light source disposed on the one of the sidewalls; and

a light diffusion plate covering the upper opening so that light rays emitted from the first light source is reflected toward the light diffusion plate by the reflective surface.

19. The backlight system of claim 18, wherein heat dissipation fins integrally extend outwardly from the one of the sidewalls.