Edge Type Back Light Module and Display Device Using the Same

• US 20100124075A1
• Filed: 11/18/2009
• Published: 05/20/2010
• Est. Priority Date: 11/18/2008
• Status: Abandoned Application

• Current Assignee: Wintek Corporation
• Original Assignee: Wintek Corporation
• Inventors: Ye, Zhi-Ting, Huang, Kuo-Jui, Huang, Chun-Chih, Hsiao, Wen-Chia, Huang, Wen-Hsiao, Qiu, Zhan-Wei
• Application Number:
  US12/620,731
• Publication Number:
  US 20100124075A1
• Time in Patent Office: Days
• US Class Current: 362/606
• CPC Class Codes: C08J 2327/16 Homopolymers or copolymers of vinylidene fluoride
• CPC Class Codes: C08J 5/18 Manufacture of films or sheets
• CPC Class Codes: G02B 6/0038 Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
• CPC Class Codes: G02B 6/0055 Reflecting element, sheet or layer

Abstract

An edge type back light module and a display device using the same are provided. The edge type back light module includes a light guide plate (LGP), a light source and a frame. The LGP has a light-receiving surface, a light-emitting surface and a light-reflecting surface opposite to the light-emitting surface. The light-emitting surface faces the display panel. The light source is adjacent to the light-receiving surface for emitting a light. The frame has a frame surface and a light guide portion. After a portion of the light contacts the light guide portion, the light guide portion disposed on the frame surface guides the portion of the light to be emitted from the light-emitting surface. A predetermined angle is contained between the outgoing direction of the portion of the light emitted from the light-emitting surface and the normal direction of the light-emitting surface.

Claims

1. An edge type back light module adjacent to a display panel of a display device, wherein the edge type back light module comprises:

a light guide plate (LGP) having a light-receiving surface, a light-emitting surface and a light-reflecting surface opposite to the light-emitting surface, wherein the light-emitting surface faces the display panel;

a light source adjacent to the light-receiving surface for emitting the light to enter the LGP; and

a frame having a frame surface and a plurality of light guide portions, wherein the frame surface faces the light-reflecting surface of the LGP, the light guide portions are disposed on the frame surface, so that after the light leaked from the light-reflecting surface contacts the light guide portions, the light leakage is guided to enter the LGP again;

wherein, the frame is made from a material whose reflection rate of the light ranges from 65% to 100%, and a predetermined angle is contained between the outgoing direction of the light emitted from the light-emitting surface and a normal direction of the light-emitting surface.

2. The edge type back light module according to claim 1, wherein the cross-section of each light guide portion is a triangle.

3. The edge type back light module according to claim 2, wherein each light guide portion is projected from the frame surface, and the vertex angle of an apex of the triangle ranges from 30 to 175 degrees.

4. The edge type back light module according to claim 2, wherein each light guide portion is a recess, the vertex angle of an apex of the triangle ranges form 30 to 175 degrees, the apex faces the direction away from the light-reflecting surface of the light guide plate.

5. The edge type back light module according to claim 1, wherein the cross-section of each light guide portion is a trapezoid.

6. The edge type back light module according to claim 5, wherein each light guide portion is projected from the frame surface, and the angle contained between a lateral side of the trapezoid and the bottom side of the trapezoid ranges from 5 to 90 degrees.

7. The edge type back light module according to claim 5, wherein each light guide portion is a recess, and the angle contained between a lateral side of the trapezoid and the bottom side of the trapezoid ranges from 90 to 175 degrees.

8. The edge type back light module according to claim 1, wherein the cross-section of each light guide portion is a polygon.

9. The edge type back light module according to claim 1, wherein a portion of the cross-sectional silhouette of each light guide portion is a curve, the curve is a portion of an elliptical curve, and the ratio of width to height of the elliptical curve ranges from 0.1 to 10.

10. The edge type back light module according to claim 1, wherein a portion of the cross-sectional silhouette of each light guide portion is a curve, the curve is a portion of a circular curve, and the ratio of width to height ranges from 0.1 to 10.

11. The edge type back light module according to claim 1, wherein the frame surface is a curved surface.

12. The edge type back light module according to claim 11, wherein the light-reflecting surface of the LGP is a curved surface.

13. The edge type back light module according to claim 1, wherein the extension path of each light guide portion is a straight line.

14. A display device having a display panel and the edge type back light module according to claim 1, wherein the edge type back light module is disposed adjacent to the display panel.

15. The display device according to claim 14, wherein the cross-section of each light guide portion is a triangle, and a vertex angle of the triangle ranges from 30 to 175 degrees.

16. The display device according to claim 14, further comprises:

a dual brightness enhancement film (DBEF) disposed adjacent to the light-emitting surface of the LGP;

wherein, the predetermined angle is 0 degree.

17. The display device according to claim 14, wherein the predetermined angle ranges from 35 to 65 degrees inclusive of 35 and 65 degrees.

18. The display device according to claim 17, further comprises:

a first brightness enhancement film (BEF) disposed adjacent to the light-emitting surface of the LGP; and

a diffusion film located between the LGP and the first BEF;

wherein, the predetermined angle ranges from 15 to 45 degrees.

19. The display device according to claim 18, further comprising a second BEF located between the first BEF and the diffusion film.

20. The display device according to claim 18, further comprising a brightness enhancement film-reflective polarizer (BEF-RP) located between the display panel and the diffusion film.