Backlight module and display device

Patent metadata

Field	Value
Publication number	US-10976602-B2
Application number	US-201916662856-A
Country	US
Kind code	B2
Filing date	Oct 24, 2019
Priority date	Nov 23, 2018
Publication date	Apr 13, 2021
Grant date	Apr 13, 2021

Abstract

A backlight module and a display device are provided. The backlight module includes a backing plate. The backing plate includes a first surface and a second surface disposed oppositely to the first surface. First surface of the backing plate includes a first region and a second region surrounding the first region. The backlight module also includes a plurality of light sources disposed on the first surface of the backing plate and arranged in an array. The plurality of light sources includes a plurality of first light sources in the first region and a plurality of second light sources in the second region. The backlight module also includes a plurality of reflection structures. Each of the reflection structures is disposed at periphery of one second light source, and reflects light emitted by the second light source to a side of the second light source facing away from the backing plate.

First claim

What is claimed is:

1. A backlight module, comprising:
a backing plate, wherein the backing plate includes a first surface and a second surface disposed oppositely to the first surface, and the first surface of the backing plate includes a first region and a second region surrounding the first region;
a plurality of light sources disposed on the first surface of the backing plate and arranged in an array, wherein the plurality of light sources includes a plurality of first light sources located in the first region and a plurality of second light sources located in the second region; and
a plurality of reflection structures, wherein each of the reflection structures is disposed at periphery of one of the second light sources, and reflects light emitted by the one of the second light sources to a side of the one of the second light sources facing away from the backing plate, while there is no reflection structure disposed at periphery of the first light sources in the first region, such that a luminous flux from the second region is increased to match a luminous flux from the first region,
wherein each of the reflection structures includes an inclined reflection surface having an angle with the first surface of the backing plate,
the inclined reflection surface has a tubular structure continuously disposed around periphery of the one of the second light sources,
the tubular structure includes a first end, a second end opposite to the first end, and a sidewall connecting the first end and the second end,
the first end of the tubular structure is located on the first surface of the backing plate, and the second end is located at a side of the backing plate where the plurality of light sources is disposed, and
an orthographic projection of the first end on the backing plate is within an orthographic projection of the second end on the backing plate.

2. The backlight module according to claim 1 , wherein:
the first ends of all the tubular structures enclose a same area on the first surface, and all the tubular structures have a same sidewall length in a plane perpendicular to the first surface; and
in a direction from the first light sources to the second light sources, areas enclosed by the second ends of the tubular structures in a plane parallel to the first surface gradually decrease.

3. The backlight module according to claim 1 , wherein:
the first ends of all the tubular structures enclose a same area on the first surface, and in a plane perpendicular to the first surface, the sidewalls of all the tubular structures have a same angle with the first surface; and
in a direction from the first light sources to the second light sources, lengths of the tubular structures in a plane perpendicular to the first surface gradually increases.

4. The backlight module according to claim 1 , wherein a shape enclosed by the first end on the first surface is same as a shape enclosed by the second end on the plane parallel to the first surface.

5. The backlight module according to claim 4 , wherein the shape enclosed by the first end on the first surface and the shape enclosed by the second end on the plane parallel to the first surface are both circular or polygonal.

6. The backlight module according to claim 1 , wherein a width of the second region in a direction from the first region to the second region is in a range of approximately 1 mm-5 mm.

7. The backlight module according to claim 1 , wherein all the tubular structures have a same shape and a same size.

8. A backlight module, comprising:
a backing plate, wherein the backing plate includes a first surface and a second surface disposed oppositely to the first surface, and the first surface of the backing plate includes a first region and a second region surrounding the first region;
a plurality of light sources disposed on the first surface of the backing plate and arranged in an array, wherein the plurality of light sources includes a plurality of first light sources located in the first region and a plurality of second light sources located in the second region; and
a plurality of reflection structures, wherein each of the reflection structures is disposed at periphery of one of the second light sources, and reflects light emitted by the one of the second light sources to a side of the one of the second light sources facing away from the backing plate, while there is no reflection structure disposed at periphery of the first light sources in the first region, such that a luminous flux from the second region is increased to match a luminous flux from the first region,
wherein each of the reflection structures includes an inclined reflection surface having an angle with the first surface of the backing plate;
the inclined reflection surface includes a plurality of separated sub-reflection surfaces; and
the plurality of sub-reflection surfaces is evenly distributed around one of the second light sources, and have a same angle with the first surface of the backing plate.

9. The backlight module according to claim 8 , wherein:
all the sub-reflection surfaces have a same shape and a same size, and have a same angle with the first surface of the backing plate; and
along a direction from the first light sources to the second light sources, number of sub-reflection surfaces disposed around one of the second light sources gradually increases.

10. The backlight module according to claim 9 , wherein a shape of the sub-reflection surfaces is an isosceles trapezoid, the upper base of the isosceles trapezoid is located at the first surface of the backing plate, and the lower base of the isosceles trapezoid is located at a side of the backing plate where the plurality of light sources is disposed.

11. The backlight module according to claim 9 , wherein the sub-reflection surfaces are curved surfaces, and a plurality of the separated sub-reflection surfaces around one of the second light sources form a portion of a sidewall of a truncated cone.

12. The backlight module according to claim 1 , wherein the light sources are Mini LED lights.

13. The backlight module according to claim 1 , wherein the reflection structure and the backing plate are formed into one single piece.

14. The backlight module according to claim 13 , wherein:
the reflection structures and the backing plate are formed into one single piece by injection molding;
the backing plate is made of a material including polyethylene terephthalate; and
the reflection structures are made of a material including polyethylene terephthalate doped with barium sulfate particles.

15. The backlight module according to claim 1 , wherein the reflection structures are formed on the backing plate by a bonding or damascene process.

16. The backlight module according to claim 15 , wherein one of the reflection structures includes compressed reflection layers including at least approximately 600 reflection layers.

17. A display device, comprising a liquid crystal display panel and a backlight module on the back of the liquid crystal display panel, wherein the backlight module includes:
a backing plate, wherein the backing plate includes a first surface and a second surface disposed oppositely to the first surface, and the first surface of the backing plate includes a first region and a second region surrounding the first region;
a plurality of light sources disposed on the first surface of the backing plate and arranged in an array, wherein the plurality of light sources includes a plurality of first light sources located in the first region and a plurality of second light sources lo

Assignees

• Xiamen Tianma Micro Electronics Co Ltd

Inventors

• Zheng Zeyuan
• Yu Yanping
• Ling Ankai
• Zhou Ting
• Shen Boping

Classifications

• G02F1/133608 Primary

  including particular frames or supporting means · CPC title

• G02F1/133603 Primary

  with LEDs · CPC title

• G02F1/133613

  characterized by the sequence of light sources · CPC title

• G02F1/133605 Primary

  including specially adapted reflectors · CPC title