Backlight system

• US 20070189032A1
• Filed: 08/23/2006
• Published: 08/16/2007
• Est. Priority Date: 02/10/2006
• Status: Abandoned Application

• Current Assignee: Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Hon Hai Precision Industry Co., Ltd.
• Inventors: Chang, Shao-Han
• Application Number:
  US11/508,541
• Publication Number:
  US 20070189032A1
• Time in Patent Office: Days
• US Class Current: 362/600
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133611 including means for improving the brightness uniformity

Abstract

A backlight system includes a light diffusion plate and at least one light source module. The light source module is disposed under the light diffusion plate. The light source module includes a base, a sidewall extending from a longitudinal edge of the base, a protrusion formed on an edge of the base opposite the first sidewall, the protrusion having a reflective surface facing the sidewall, and at least a light source fixed on an inner surface of the sidewall facing the reflective surface of the protrusion. Light rays from the light source being reflected at the reflective surface toward the light diffusion plate. The present backlight system has a good optical performance, lightweight and thin body.

Claims

1. A backlight system comprising:

a light diffusion plate; and

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

a base;

a first sidewall extending from a longitudinal edge of the base;

a protrusion formed on an edge of the base opposite the first sidewall, the protrusion having a first reflective surface facing the first sidewall; and

at least a light source fixed on or adjacent the sidewall facing the reflective surface of the protrusion in a manner so as to allow light rays from the light source to be reflected at the reflective surface toward the light diffusion plate.

2. The backlight system according to claim 1, wherein the light source module further comprises an upper reflective unit positioned on a top of the first sidewall.

3. The backlight system according to claim 2, wherein the upper reflective unit comprises a first protruding portion extending from a top the first sidewall towards an inner area of the base, 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 the first reflective surface of the protrusion.

4. The backlight system according to claim 2, wherein the upper reflective unit comprises a first protruding portion extending from a top the first sidewall towards an inner area of the base, the first protruding portion and the sidewall cooperatively forming a second reflective surface facing the light source.

5. The backlight system according to claim 1, wherein each light source module further comprises a bottom reflective unit each positioned on the base adjacent to the first sidewall, the bottom reflective unit having a third protruding portion extending from the base toward the light diffusion plate, the third protruding portion and the base cooperatively forming a third reflective surface interconnecting the first reflective surface.

6. The backlight system according to claim 1, wherein the first sidewall and the base cooperatively forming a third reflective surface interconnecting the first reflective surface.

7. The backlight system according to claim 1, wherein the protrusion extends out along the opposite edge of the first base, the first reflective surface of the protrusion being selected from one of a curved surface, a flat surface, a stepped surface and a combination thereof.

8. The backlight system according to claim 1, wherein inner surface of the first sidewall of the light source module is slanted to the base, an inclination angle defined by the inner surface of the sidewall with respect to the base being configured to be in a range from about 45 to about 90 degrees.

9. The backlight system according to claim 1, wherein the light source is selected from a group consisting of light emitting diode and cold cathode fluorescent lamp.

10. The backlight system according to claim 9, wherein the light source is a light emitting diode, and the light emitting diode are adhered to the inner surfaces of the two opposite sidewalls.

11. The backlight system according to claim 9, wherein the light source is a light emitting diode, and the light emitting diode is fixed on an electric circuit board, the electric circuit board with the light emitting diode are fixed to the inner surface of the first sidewall.

12. The backlight system according to claim 1, wherein the backlight system comprises a plurality of light source modules, the light source modules being aligned regularly beneath the light diffusion plate, and each first sidewall of the light source module being in contact with the protrusion of the adjacent light source module.

13. The backlight system according to claim 1, wherein the backlight system comprises a plurality of light source modules, the light source modules being aligned regularly under the light diffusion plate, and each first sidewall of the light source module being in contact with first sidewall of the adjacent light source module, or each protrusion of the light source module being in contact with the protrusion of the adjacent light source module.

14. The backlight system according to claim 1, further comprising a frame to receive the light source module, the frame having a rectangular substrate, a plurality of second sidewalls extending from the peripheral of the substrate to define an opening, the light diffusion plate positioned on the opening.

15. The backlight system according to claim 1, further comprising a prism sheet and a reflective polarizer stacked on the light diffusion plate in that order, for increasing optical brightness.

16. The backlight system according to claim 1, further comprising a highly reflective film deposited on the reflective surface of the protrusion.

17. A backlight system comprising:

a supporting substrate;

a light diffusion plate separate from and oriented in a direction substantially parallel to the supporting substrate; and

a plurality of light source modules evenly distributed on a surface of the supporting substrate opposing the light diffusion plate, each of the light source modules including opposing first and second protruding portions and a light source fixed to or adjacent the first protruding portion, the second protruding portion forming a slanted reflective surface structured for reflecting light rays from the light source toward the light diffusion plate.

18. The backlight system of claim 17, wherein the first protruding portion of each light source module contacts the first protruding portion of one adjacent light source module.

19. The backlight system of claim 17, wherein the first protruding portion of each light source module contacts the second protruding portion of one adjacent light source module.