Back light module

• US 6,814,456 B1
• Filed: 05/15/2003
• Issued: 11/09/2004
• Est. Priority Date: 05/15/2003
• Status: Expired due to Fees

• Current Assignee: InnoLux Corporation
• Original Assignee: Toppoly Optoelectronics Corporation (InnoLux Corporation)
• Inventors: Huang, Hua-Nan, Mai, Che-Kuei
• Primary Examiner(s): Cariaso, Alan
• Assistant Examiner(s): Tsidulko, Mark
• Application Number:
  US10/249,889
• Publication Number:
  US 20040228105A1
• Time in Patent Office: 544 Days
• Field of Search: 362/30, 362/29, 362/218, 362/224, 362/225, 362/245-248, 362/294, 362/330, 362/345, 362/26, 362/31, 362/27, 362/351, 362/559, 362/355, 362/558
• US Class Current: 362/30
• CPC Class Codes: G02B 6/0013 Means for improving the coupling-in of light from the light source into the light guide coupling light into light guides in general G02B6/42
• CPC Class Codes: G02B 6/0051 Diffusing sheet or layer

Abstract

A back light module disposed under a display panel has at least a light source generator for generating light beams, a diffusing plate for scattering the light beams to the display panel, a light guide plate for scattering the light beams to the diffusing plate, at least a light shading sheet with a plurality of light holes, and a reflecting sheet for scattering the light beams to the light guide plate.

Claims

1. A direct-type back light module disposed under a display panel comprising:

at least one direct-type light source generator for providing light;

a diffusing plate disposed between the direct-type light source generator and the display panel for scattering light to the display panel;

a prism disposed on a surface of the diffusing plate;

a light guide plate disposed between the direct-type light source generator and the diffusing plate for scattering light to the diffusing plate;

at least one light shading sheet disposed between the direct-type light source generator and the light guide plate, the light shading sheet comprising a plurality of light holes; and

a reflecting sheet disposed under the direct-type light source generator for reflecting light to the light guide plate.

2. The direct-type back light module of claim 1 wherein the direct-type back light module further comprises a housing disposed under the reflecting sheet to surround the reflecting sheet.

3. The direct-type back light module of claim 1 wherein the reflecting sheet comprises at least one opening for dissipating heat during the operation of the direct-type back light module.

4. The direct-type back light module of claim 1 wherein the direct-type light source generator is a lamp.

5. The direct-type back light module of claim 4 wherein the lamps are arranged in parallel.

6. The direct-type back light module of claim 1 wherein the light shading sheet is an arc-shaped sheet.

7. The direct-type back light module of claim 6 wherein the light shading sheet is a semi-transparent sheet.

8. The direct-type back light module of claim 6 wherein the light shading sheet is a reflecting film for reflecting light to the reflecting sheet, and further reflecting light to the light guide plate through the reflecting sheet.

9. The direct-type back light module of claim 8 wherein the reflecting film is a metal sheet.

10. A direct-type back light module disposed under a display panel comprising:

at least one direct-type light source generator for generating light;

a diffusing plate disposed between the direct-type light source generator and the display panel for scattering light to the display panel;

a prism disposed on a surface of the diffusing plate;

a light guide plate disposed between the direct-type light source generator and the diffusing plate for scattering light to the diffusing plate;

at least one arc-shaped light shading sheet disposed between the direct-type light source generator and the light guide plate;

a reflecting sheet disposed under the direct-type light source generator for reflecting light to the light guide plate; and

a housing disposed under the reflecting sheet for surrounding the reflecting sheet.

11. The direct-type back light module of claim 10 wherein the reflecting sheet comprises at least one opening for dissipating heat during the operation of the direct-type back light module.

12. The direct-type back light module of claim 10 wherein the direct-type light source generator is a lamp.

13. The direct-type back light module of claim 12 wherein the lamps are arranged in parallel.

14. The direct-type back light module of claim 10 wherein the light shading sheet is a semi-transparent sheet.