Display backlight unit having reflecting structure for reducing hotspots

Patent metadata

Field	Value
Publication number	US-9400348-B2
Application number	US-201314103792-A
Country	US
Kind code	B2
Filing date	Dec 11, 2013
Priority date	Dec 11, 2012
Publication date	Jul 26, 2016
Grant date	Jul 26, 2016

Abstract

A light-emitting device including a lampshade and a light-source set arranged within the lampshade. The lampshade includes a light-reflecting structure set for respectively reflecting rays in a middle portion of light emitted from a corresponding light source, towards two sides of the corresponding light source. A backlight unit including the light-emitting device and a display device including the backlight unit are provided.

First claim

What is claimed is:

1. A light-emitting device comprising:
a lampshade including a bottom wall and two sidewalls arranged at two opposite sides of the bottom wall;
a plurality of light sources arranged within the lampshade, at least two of the plurality of light sources being arranged separately from one another; and
a plurality of light-reflecting structures arranged in the lampshade such that at least one of the plurality of light-reflecting structures corresponds to at least one of the plurality of light sources, and configured to reflect light rays at the central region of light emitted from a corresponding light source towards two sides of the corresponding light source,
wherein the plurality of light sources are arranged on the bottom wall, and the plurality of light-reflecting structures are arranged on an inner edge of one of the two sidewalls, such that
a central axis of each light-reflecting structure coincides with a central axis of a light source corresponding to the light-reflecting structure, or a central axis of each light-reflecting structure is parallel to a central axis of a light source corresponding to the light-reflecting structure.

2. The light-emitting device according to claim 1 , wherein in a case where the central axis of each light-reflecting structure is parallel to the central axis of the light source corresponding to the light-reflecting structure, a plane determined by the central axis of the light-reflecting structure and the central axis of the light source corresponding to the light-reflecting structure is perpendicular to a sidewall on which the light-reflecting structure is arranged.

3. The light-emitting device according to claim 1 , wherein
both of the two sidewalls are flat sidewalls; or
a sidewall of the two sidewalls on which no light-reflecting structure is arranged is a flat sidewall, and an edge of a sidewall on which a light-reflecting structure is arranged bends towards the flat sidewall.

4. The light-emitting device according to claim 1 , wherein a sidewall of the lampshade on which a light-reflecting structure is arranged and the light-reflecting structure are integrally formed, or are separately formed and then the light-reflecting structure is attached to the sidewall.

5. The light-emitting device according to claim 1 , wherein
the lampshade is formed of reflective material; or
the light source is a light emitting diode or an electroluminescent sheet.

6. The light-emitting device according to claim 1 , wherein when being viewed in a direction perpendicular to the bottom wall, a shape of each of the light-reflecting structures itself is mirror-symmetrical with respect to a central axis of the shape.

7. The light-emitting device according to claim 6 , wherein
each light-reflecting structure of the light-reflecting structures is a prism, one bottom of the prism is close to a light source corresponding to the light-reflecting structure, and the other bottom of the prism is far away from the light source corresponding to the light-reflecting structure; or
each light-reflecting structure of the light-reflecting structures is a semi-cylinder, one bottom of the semi-cylinder is close to a light source corresponding to the light-reflecting structure, and the other bottom of the semi-cylinder is far away from the light source corresponding to the light-reflecting structure; or
each light-reflecting structure of the light-reflecting structures is a pyramid, a vertex of the pyramid is close to a light source corresponding to the light-reflecting structure, and a bottom of the pyramid is far away from the light source corresponding to the light-reflecting structure; or
each light-reflecting structure of the light-reflecting structures is a semi-cone, a vertex of the semi-cone is close to a light source corresponding to the light-reflecting structure, and a bottom of the semi-cone is far away from the light source corresponding to the light-reflecting structure.

8. A backlight unit comprising the light-emitting device according to claim 1 .

9. A display device comprising the backlight unit according to claim 8 .

10. A light-emitting device comprising:
a lampshade including a bottom wall and two sidewalls arranged at two opposite sides of the bottom wall;
a plurality of light sources arranged within the lampshade, at least two of the plurality of light sources being arranged separately from one another; and
a plurality of light-reflecting structures arranged in the lampshade such that at least two of the plurality of light-reflecting structures correspond to at least one of the plurality of light sources, and configured to reflect light rays at the central region of light emitted from a corresponding light source towards two sides of the corresponding light source,
wherein the plurality of light sources are arranged on the bottom wall, at least two light-reflecting structures corresponding to the at least one light source are respectively arranged on inner edges of the two sidewalls, such that
a central axis of one of the two light-reflecting structures coincides with a central axis of the corresponding light source, a central axis of the other light-reflecting structure is parallel to the central axis of the corresponding light source; or central axes of the two light-reflecting structures are respectively parallel to the central axis of the corresponding light source.

11. The light-emitting device according to claim 10 , wherein the central axis of one of the two light-reflecting structures coincides with the central axis of the corresponding light source, the central axis of the other light-reflecting structure is parallel to the central axis of the corresponding light source as well as a plane determined by the central axis of the other light-reflecting structure and the central axis of the corresponding light source is perpendicular to the sidewall on which the other light-reflecting structure is arranged; or the central axes of the two light-reflecting structures are respectively parallel to the central axis of the corresponding light source as well as a plane determined by the central axis of one of the two light-reflecting structures and the central axis of the corresponding light source and a plane determined by the central axis of the other light-reflecting structure and the central axis of the corresponding light source are respectively perpendicular to two sidewalls on which the two light-reflecting structures are arranged.

12. The light-emitting device according to claim 10 , wherein
both of the two sidewalls are flat sidewalls; or
an edge of each of the two sidewalls bends towards the other sidewall.

13. The light-emitting device according to claim 10 , wherein a sidewall of the lampshade on which a light-reflecting structure is arranged and the light-reflecting structure are integrally formed, or are separately formed and then the light-reflecting structure is attached to the sidewall.

14. The light-emitting device according to claim 10 , wherein
the lampshade is formed of reflective material; or
the light source is a light emitting diode or an electroluminescent sheet.

15. The light-emitting device according to claim 10 , wherein when being viewed in a direction perpendicular to the bottom wall, a shape of each of the light-reflecting structures itself is mirror-symmetrical with respect to a central axis of the shape.

16. The light-emitting device according to claim 15 , wherein
each light-reflecting structure of the light-reflecting structures is a prism, one bottom of the prism is close to a light source corresponding to th

Assignees

• Boe Technology Group Co Ltd
• Hefei Boe Display Light Co Ltd

Inventors

• He Shuyong
• Chen Guohui
• Wang Peina

Classifications

• G02F1/133615

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

• G02B6/0031 Primary

  Reflecting element, sheet or layer · CPC title