Back cover for backlight source, backlight source, and display apparatus

Patent metadata

Field	Value
Publication number	US-9285517-B2
Application number	US-201314104014-A
Country	US
Kind code	B2
Filing date	Dec 12, 2013
Priority date	Dec 14, 2012
Publication date	Mar 15, 2016
Grant date	Mar 15, 2016

Abstract

The present invention provides a back cover for a backlight source, a backlight source and a display apparatus. The back cover includes at least one reflection surface arranged on one surface of the back cover. The reflection surface includes a first reflection region and a second reflection region, each of which includes a plurality of concave arc-shaped regions. The concave arc-shaped regions of the first reflection region have curvature increasing toward the second reflection region, and the concave arc-shaped regions of the second reflection region have curvatures decreasing in a direction away from the first reflection region. The concave arc-shaped region having a maximum curvature in the first reflection region is connected with the concave arc-shaped region having a maximum curvature in the second reflection region.

First claim

What is claimed is:

1. A back cover for a backlight source, comprising:
at least one reflection surface arranged on one surface of the back cover, wherein:
the reflection surface includes a first reflection region and a second reflection region;
the first reflection region includes a plurality of concave arc-shaped regions whose curvatures gradually increase in a direction toward the second reflection region;
the second reflection region includes a plurality of concave arc-shaped regions whose curvatures gradually decrease in a direction away from the first reflection region; and
the concave arc-shaped region having a maximum curvature in the first reflection region is connected with the concave arc-shaped region having a maximum curvature in the second reflection region.

2. The back cover according to claim 1 , wherein:
the first reflection region includes a first concave arc-shaped region having a curvature within a range of 0.004 to 0.007 mm −1 , a second concave arc-shaped region having a curvature within a range of 0.008 to 0.011 mm −1 , and a third concave arc-shaped region having a curvature within a range of 0.03 to 0.06 mm −1 ; and
the second reflection region includes a fourth concave arc-shaped region having a curvature within a range of 0.008 to 0.01 mm −1 , a fifth concave arc-shaped region having a curvature within a range of 0.005 to 0.007 mm −1 , a sixth concave arc-shaped region having a curvature within a range of 0.002 to 0.004 mm −1 , and a seventh concave arc-shaped region having a curvature within a range of 0.0006 to 0.001 mm −1 .

3. The back cover according to claim 2 , wherein:
the first concave arc-shaped region has a central angle α1 within a range of 2 to 4 degrees;
the second concave arc-shaped region has a central angle α2 within a range of 5 to 8 degrees;
the third concave arc-shaped region has a central angle α3 within a range of 7 to 9 degrees;
the fourth concave arc-shaped region has a central angle α4 within a range of 8 to 11 degrees;
the fifth concave arc-shaped region has a central angle α5 within a range of 3 to 5 degrees;
the sixth concave arc-shaped region has a central angle α6 within a range of 3 to 6 degrees; and
the seventh concave arc-shaped region has a central angle α7 within a range of 2 to 4 degrees.

4. The back cover according to claim 3 , wherein:
the reflection surface further includes a third reflection region;
the third reflection region includes an eighth concave arc-shaped region having a curvature within a range of 0.001 to 0.004 mm −1 and a ninth concave arc-shaped region having a curvature within a range of 0.001 to 0.003 mm −1 ; and
the eighth concave arc-shaped region is connected with the seventh concave arc-shaped region.

5. The back cover according to claim 4 , wherein:
the eighth concave arc-shaped region has a central angle α8 within a range of 2 to 4 degrees; and
the ninth concave arc-shaped region has a central angle α9 within a range of 1 to 3 degrees.

6. The back cover according to claim 4 , wherein:
the reflection surface further includes a convex arc-shaped region;
the convex arc-shaped region is connected with the ninth concave arc-shaped region; and
the convex arc-shaped region has a curvature within a range of 0.004 to 0.007 mm −1 and a central range α10 within a range of 4 to 7 degrees.

7. The back cover according to claim 6 , wherein:
the back plate includes two pieces of the reflection surface which are axial-symmetrically arranged and referred to as a first reflection surface and a second reflection surface respectively.

8. The back cover according to claim 7 , wherein;
the convex arc-shaped region of the first reflection region is connected with the convex arc-shaped region of the second reflection region.

9. A backlight source, comprising:
the back cover according to claim 1 ; and
a light emitting diode (LED) light arranged adjacent to one side of the back cover.

10. The backlight source according to claim 9 , wherein
the LED light is arranged adjacent to the first reflection region of the reflection surface.

11. The backlight source according to claim 9 , wherein
the first reflection region includes a first concave arc-shaped region having a curvature within a range of 0.004 to 0.007 mm −1 , a second concave arc-shaped region having a curvature within a range of 0.008 to 0.011 mm −1 , and a third concave arc-shaped region having a curvature within a range of 0.03 to 0.06 mm −1 ; and
the second reflection region includes a fourth concave arc-shaped region having a curvature within a range of 0.008 to 0.01 mm −1 , a fifth concave arc-shaped region having a curvature within a range of 0.005 to 0.007 mm −1 , a sixth concave arc-shaped region having a curvature within a range of 0.002 to 0.004 mm −1 , and a seventh concave arc-shaped region having a curvature within a range of 0.0006 to 0.001 mm −1 .

12. The backlight source according to claim 11 , wherein
the first concave arc-shaped region has a central angle α1 within a range of 2 to 4 degrees;
the second concave arc-shaped region has a central angle α2 within a range of 5 to 8 degrees;
the third concave arc-shaped region has a central angle α3 within a range of 7 to 9 degrees;
the fourth concave arc-shaped region has a central angle α4 within a range of 8 to 11 degrees;
the fifth concave arc-shaped region has a central angle α5 within a range of 3 to 5 degrees;
the sixth concave arc-shaped region has a central angle α6 within a range of 3 to 6 degrees; and
the seventh concave arc-shaped region has a central angle α7 within a range of 2 to 4 degrees.

13. The backlight source according to claim 12 , wherein
the reflection surface further includes a third reflection region;
the third reflection region includes an eighth concave arc-shaped region having a curvature within a range of 0.001 to 0.004 mm −1 and a ninth concave arc-shaped region having a curvature within a range of 0.001 to 0.003 mm −1 ; and
the eighth concave arc-shaped region is connected with the seventh concave arc-shaped region.

14. The backlight source according to claim 13 , wherein
the eighth concave arc-shaped region has a central angle α8 within a range of 2 to 4 degrees; and
the ninth concave arc-shaped region has a central angle α9 within a range of 1 to 3 degrees.

15. The backlight source according to claim 13 , wherein
the reflection surface further includes a convex arc-shaped region;
the convex arc-shaped region is connected with the ninth concave arc-shaped region; and
the convex arc-shaped region has a curvature within a range of 0.004 to 0.007 mm −1 and a central range α10 within a range of 4 to 7 degrees.

16. The backlight source according to claim 15 , wherein
the back plate includes two pieces of the reflection surface which are axial-symmetrically arranged and referred to as a first reflection surface and a second reflection surface respectively.

17. The backlight source according to claim 16 , wherein
the convex arc-shaped region of the first reflection region is connected with the convex arc-shaped region of the second reflection region.

18. A display apparatus, comprising
the backlight source according to claim 10 .

19. A display apparatus, comprising a display panel, a back cover and a light source; wherein the back cover comprises at least one reflection surface facing the display panel;
the reflection surface comprises a first reflection region and a second reflection region adjoining the first reflection region;
the first reflecti

Assignees

• Boe Technology Group Co Ltd
• Beijing Boe Display Tech Co

Inventors

• Sun Lingyu
• Zhu Hongli
• Chen Xiuyun
• Yoon Dae Keun

Classifications

• F21V7/09

  with a combination of different curvatures · CPC title

• G02F1/133615

  Edge-illuminating devices, i.e. illuminating from the side · CPC title

• G02B6/0096

  the lights guides being of the hollow type · CPC title

• G02B6/0061

  to provide homogeneous light output intensity · CPC title

• G02B5/10 Primary

  with curved faces · CPC title