Liquid crystal display and backlight module thereof

• US 7,641,378 B2
• Filed: 12/01/2006
• Issued: 01/05/2010
• Est. Priority Date: 10/03/2006
• Status: Active Grant

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Hsieh, Tsung-Hsien, Li, Szu-Han, Tien, Cheng-Hua, Tien, Ching-Fu, Chuang, Yung-Pin, Lin, Keng-Ju
• Primary Examiner(s): Lee; Jong-Suk (James)
• Assistant Examiner(s): Shallenberger; Julie A
• Application Number:
  US11/565,629
• Publication Number:
  US 20080080211A1
• Time in Patent Office: 1,131 Days
• Field of Search: 349 61- 71, 362632-634, 362/600, 362623-625, 362/609
• US Class Current: 362/633
• CPC Class Codes: G02B 6/0031 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0051 Diffusing sheet or layer
• CPC Class Codes: G02B 6/0088 of the light guide or other optical sheets in the package

Abstract

A backlight module including a first frame, a light guide plate, and a light source is provided. The inner surface of the first frame has at least a first reflection area. In addition, the light guide plate is disposed in the first frame and located beside the first reflection area, and the light guide plate has a light incident surface. Moreover, the light source is disposed in the first frame and between the first reflection area and the light incident surface. The first reflection area is suitable for reflecting a part of the light emitted from the light source to the light incident surface. A liquid crystal display using the backlight module is also provided.

Claims

1. A backlight module, comprising:

a first frame, comprising at least a first reflection area on an inner surface thereof;

a light guide plate, disposed in the first frame and located beside to the first reflection area, wherein the light guide plate has a light incident surface;

a light source, disposed in the first frame and between the first reflection area and the light incident surface;

a positioning metal piece, disposed on the first reflection area of the first frame, wherein the positioning metal piece is adopted for reflecting the light emitted from the light source to the light incident surface; and

a second frame, disposed on the first frame, wherein the second frame comprises;

an opening to expose the light guide plate, wherein an inner surface of the second frame comprises at least a second reflection area, and the second reflection area is adopted for reflecting the light emitted from the light source to the light incident surface; and

a retaining recess, wherein the positioning metal piece extends into the retaining recess, so as to position the first frame and the second frame.

2. The backlight module of claim 1, wherein the material of the first frame comprises a high reflectivity material.

3. The backlight module of claim 1, wherein the first frame has at least a first positioning portion located at an edge of the first reflection area for positioning the light guide plate.

4. The backlight module of claim 1, wherein the second frame comprises at least a second positioning portion located at an edge of the second reflection area for positioning the light guide plate.

5. The backlight module of claim 1, further comprising an optical film disposed on the first reflection area of the first frame and the second reflection area of the second frame.

6. The backlight module of claim 5, wherein the optical film comprises at least a reflector, a brightness enhancement film or a prism sheet, or a combination thereof.

7. The backlight module of claim 5, wherein the positioning metal piece is disposed between the first reflection area of the first frame and the optical film.

8. The backlight module of claim 1, wherein the material of the second frame comprises a high reflectivity material.

9. The backlight module of claim 1, further comprising an optical film set disposed above the light guide plate.

10. The backlight module of claim 9, wherein the optical film set at least comprises a diffuser film, a prism sheet or a brightness enhancement film, or a combination thereof.

11. The backlight module of claim 1, further comprising a reflector disposed at a bottom of the light guide plate.

12. A liquid crystal display, comprising:

a backlight module, comprising;

a first frame, comprising at least a first reflection area on an inner surface thereof;

a light guide plate, disposed in the first frame and located beside to the first reflection area, wherein the light guide plate has a light incident surface;

a light source, disposed in the first frame and between the first reflection area and the light incident surface;

a positioning metal piece, disposed on the first reflection area of the first frame, wherein the positioning metal piece is adopted for reflecting the light emitted from the light source to the light incident surface; and

a second frame, disposed on the first frame, wherein the second frame comprises;

an opening to expose the light guide plate, wherein an inner surface of the second frame comprises at least a second reflection area, and the second reflection area is adopted for reflecting the light emitted from the light source to the light incident surface; and

a retaining recess, wherein the positioning metal piece extends into the retaining recess, so as to position the first frame and the second frame; and

a liquid crystal panel, disposed above the light guide plate.

13. The liquid crystal display of claim 12, wherein the material of the first frame comprises a high reflectivity material.

14. The liquid crystal display of claim 12, wherein the first frame has at least a first positioning portion located at an edge of the first reflection area for positioning the light guide plate.

15. The liquid crystal display of claim 12, wherein the second frame has at least a second positioning portion located at an edge of the second reflection area for positioning the light guide plate.

16. The liquid crystal display of claim 12, further comprising an optical film disposed on the first reflection area of the first frame and the second reflection area of the second frame.

17. The liquid crystal display of claim 16, wherein the optical film comprises at least a reflector, a brightness enhancement film or a prism sheet, or a combination thereof.

18. The liquid crystal display of claim 16, wherein the positioning metal piece is disposed between the first reflection area of the first frame and the optical film.

19. The liquid crystal display of claim 12, wherein the material of the second frame comprises a high reflectivity material.

20. The liquid crystal display of claim 12, further comprising an optical film set disposed above the light guide plate.

21. The liquid crystal display of claim 20, wherein the optical film set at least comprises a diffuser film, a prism sheet or a brightness enhancement film, or a combination thereof.

22. The liquid crystal display of claim 12, further comprising a reflector disposed at a bottom of the light guide plate.