PRISM LIGHT GUIDE PLATE AND CORRESPONDING BACKLIGHT MODULE

• US 20130279192A1
• Filed: 05/24/2012
• Published: 10/24/2013
• Est. Priority Date: 04/18/2012
• Status: Abandoned Application

• Current Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Original Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Inventors: Chang, Kuangyao, Fan, Wei
• Application Number:
  US13/636,644
• Publication Number:
  US 20130279192A1
• Time in Patent Office: Days
• US Class Current: 362/607
• 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 6/005 provided by one optical element, or plurality thereof, placed on the light output side of the light guide
• CPC Class Codes: G02B 6/0053 Prismatic sheet or layer; Brightness enhancement element, sheet or layer
• CPC Class Codes: G02B 6/0088 of the light guide or other optical sheets in the package

Abstract

The present invention relates a prism light guide plate and a corresponding backlight module. The prism light guide plate includes a plate body. The plate body has a plurality of bar-shaped prisms disposed on a light-exiting surface of the plate body and at least one light-absorption layer disposed on at least one side surface of the plate body. The present invention disposes the light-absorption layer on the side surface of the plate body to reduce or eliminate the bright lines at the side surfaces of the prism light guide plate so that the technical problem of bright lines occurring at the side surfaces of a conventional prism light guide plate can be effectively solved.

Claims

1. A prism light guide plate comprising:

a plate body having a light-exiting surface, a plurality of bar-shaped prisms, an incident surface and two side surfaces, wherein the bar-shaped prisms are mounted on the light-exiting surface and parallel to each other, the incident surface is perpendicular to a length direction of the bar-shaped prisms, and the side surfaces are parallel to the length direction of the bar-shaped prisms; and

two light-absorption layers being respectively disposed on the side surfaces of the plate body;

wherein

the light absorption rate of the light-absorption layers is ranged between 30% and 80%; and

the light-absorption layers are directly attached to the side surfaces.

2. The prism light guide plate as claimed in claim 1, wherein each of the side surfaces includes a fixing portion for fixing the plate body;

and each of the light-absorption layers is mounted at the fixing portion on each of the side surfaces.

3. A prism light guide plate comprising:

a plate body having a light-exiting surface, a plurality of bar-shaped prisms, an incident surface and two side surfaces, wherein the bar-shaped prisms are mounted on the light-exiting surface and parallel to each other, the incident surface is perpendicular to a length direction of the bar-shaped prisms, and the side surfaces are parallel to the length direction of the bar-shaped prisms; and

two light-absorption layers being respectively disposed on the side surfaces of the plate body.

4. The prism light guide plate as claimed in claim 3, wherein the light absorption rate of the light-absorption layers is ranged between 30% and 80%.

5. The prism light guide plate as claimed in claim 3, wherein the light-absorption layers are directly attached to the side surfaces.

6. The prism light guide plate as claimed in claim 5, wherein each of the light-absorption layers is a light-absorption coating.

7. The prism light guide plate as claimed in claim 5, wherein each of the light-absorption layers is a light-absorption adhesive tape.

8. The prism light guide plate as claimed in claim 5, wherein each of the light-absorption layers is a combination of a light-absorption coating and a light-absorption adhesive tape.

9. The prism light guide plate as claimed in claim 8, wherein the light-absorption adhesive tape is directly attached to the side surface, and the light-absorption coating is coated on the light-absorption adhesive tape.

10. The prism light guide plate as claimed in claim 3, wherein each of the side surfaces includes a fixing portion for fixing the plate body.

11. The prism light guide plate as claimed in claim 10, wherein each of the light-absorption layers is mounted at the fixing portion on each of the side surfaces.

12. A backlight module comprising:

a light source; and

a prism light guide plate mounted at a side of a light-emitting surface of the light source and having;

a plate body having a light-exiting surface, a plurality of bar-shaped prisms, an incident surface and two side surfaces, wherein the bar-shaped prisms are mounted on the light-exiting surface and parallel to each other, the incident surface is perpendicular to a length direction of the bar-shaped prisms and facing the light-emitting surface of the light source, and the side surfaces are parallel to the length direction of the bar-shaped prisms; and

two light-absorption layers being respectively disposed on the side surfaces of the plate body.

13. The backlight module as claimed in claim 12, wherein the light absorption rate of the light-absorption layers is ranged between 30% and 80%.

14. The backlight module as claimed in claim 12, wherein the light-absorption layers are directly attached to the side surfaces.

15. The backlight module as claimed in claim 14, wherein each of the light-absorption layers is a light-absorption coating.

16. The backlight module as claimed in claim 14, wherein each of the light-absorption layers is a light-absorption adhesive tape.

17. The backlight module as claimed in claim 14, wherein each of the light-absorption layers is a combination of a light-absorption coating and a light-absorption adhesive tape.

18. The backlight module as claimed in claim 17, wherein the light-absorption adhesive tape is directly attached to the side surface, and the light-absorption coating is coated on the light-absorption adhesive tape.

19. The backlight module as claimed in claim 12, wherein each of the side surfaces includes a fixing portion for fixing the plate body.

20. The backlight module as claimed in claim 19, wherein each of the light-absorption layers is mounted at the fixing portion on each of the side surfaces.