Back plate, backlight module, display device, and assembly method of backlight module

Patent metadata

Field	Value
Publication number	US-10506673-B2
Application number	US-201715548521-A
Country	US
Kind code	B2
Filing date	Jan 25, 2017
Priority date	Apr 27, 2016
Publication date	Dec 10, 2019
Grant date	Dec 10, 2019

Abstract

A back plate, a backlight module, a display device, and an assembly method of the backlight module are provided. The backlight module includes: a back plate, including a main body portion, the main body portion having a first main surface and a second main surface opposite to each other; and the main body portion being provided with a hollow structure; a light source, passing through the hollow structure from a second main surface side of the main body portion; a light guide plate, provided on the first main surface side of the main body portion of the back plate, wherein, the light-emitting portion of the light source includes a light emergent surface, and the light emergent surface faces a light incident surface of the light guide plate.

First claim

The invention claimed is:

1. A backlight module, comprising:
a back plate, comprising a main body portion, the main body portion having a first main surface and a second main surface opposite to each other; and the main body portion, being provided with a hollow structure;
a light source, passing through the hollow structure from a second main surface side of the main body portion, and a light-emitting portion of the light source being exposed on a first main surface side of the main body portion;
a light guide plate, provided on the first main surface side of the main body portion of the back plate,
wherein, the light-emitting portion of the light source includes a light emergent surface, and the light emergent surface faces a light incident surface of the light guide plate,
the hollow structure is provided at a portion of the main body portion close to a first edge thereof, and the back plate further comprises a first bent portion bent from the first edge of the main body portion toward the first main surface side, and a second bent portion bent from an edge of the first bent portion away from the main body portion toward a middle portion of the main body portion, the second bent portion and the main body portion are spaced apart from each other and at least partially overlap in a direction perpendicular to the first main surface,
the hollow structure extends parallel to the first edge, a portion of the main body portion close to the first edge includes a step structure, so that the main body portion is divided into a first portion and a second portion that are staggered in a direction perpendicular to the first main surface, and the hollow structure is located in the first portion.

2. The backlight module according to claim 1 , wherein, the light incident surface of the light guide plate is at least one side surface of the light guide plate.

3. The backlight module according to claim 1 , wherein, the light source includes a strip base and a light-emitting portion provided on the strip base, and the strip base is located on the second main surface side of the main body portion, the light-emitting portion passes through the hollow structure so that the light emergent surface is exposed on the first main surface side of the main body portion.

4. The backlight module according to claim 3 , wherein, the light emergent surface of the light-emitting portion of the light source is located on a side surface of the light-emitting portion facing the light incident surface of the light guide plate.

5. The backlight module according to claim 1 , wherein, an end portion of the light guide plate provided with the light incident surface is located between the second bent portion and the main body portion.

6. The backlight module according to claim 1 , wherein, a distance between the first portion and the second portion of the main body portion in the direction perpendicular to the first main surface is substantially the same as a thickness of the strip base of the light source.

7. The backlight module according to claim 1 , wherein, as seen from a plan-view diagram parallel to the first main surface of the main body portion, the hollow structure includes a strip structure extending along the first edge of the main body portion, and a plurality of protrusion structures protruding from the strip structure toward the first edge and arranged at intervals in a direction parallel to the first edge.

8. The backlight module according to claim 7 , wherein, the light-emitting portion of the light source includes a plurality of sub-light-emitting portions arranged at intervals in an extending direction of the strip base, and the plurality of sub-light-emitting portions are respectively embedded into the plurality of protrusion structures of the hollow structure.

9. The backlight module according to claim 1 ,
wherein, a portion of the strip base of the light source extending beyond the hollow structure in a direction parallel to the first edge is fixed onto the second main surface of the main body portion.

10. The backlight module according to claim 1 , wherein, the first bent portion is perpendicular to the first main surface, and the second bent portion is parallel to the first main surface.

11. A display device comprising the backlight module according to claim 1 .

12. An assembly method of the backlight module according to claim 1 , comprising:
providing the back plate, the light source, and the light guide plate;
providing the light guide plate on the first main surface side of the back plate,
making the light source pass through the hollow structure from the second main surface side of the main body portion of the back plate, so that the light-emitting portion of the light source is exposed on the first main surface side of the main body portion, and the light emergent surface of the light-emitting portion faces the light incident surface of the light guide plate.

13. A back plate for a backlight module, comprising a main body portion, the main body portion having a first main surface and a second main surface opposite to each other,
wherein, the main body portion is provided with a hollow structure, the hollow structure is used for making a light source of the backlight module pass through the hollow structure from the second main surface side of the main body portion, and a light-emitting portion of the light source is exposed on a first main surface side of the main body portion,
the hollow structure is provided at a portion of the main body portion close to a first edge thereof, and the back plate further comprises a first bent portion bent from the first edge of the main body portion toward the first main surface side, and a second bent portion bent from an edge of the first bent portion away from the main body portion toward a middle portion of the main body portion, the second bent portion and the main body portion are spaced apart from each other and at least partially overlap in a direction perpendicular to the first main surface,
the hollow structure extends parallel to the first edge, a portion of the main body portion close to the first edge includes a step structure, so that the main body portion is divided into a first portion and a second portion that are staggered in a direction perpendicular to the first main surface, and the hollow structure is located in the first portion.

14. The back plate according to claim 13 , wherein, the first bent portion is perpendicular to the first main surface, and the second bent portion is parallel to the first main surface.

15. The back plate according to claim 13 , wherein, the back plate comprises an un-hollowed portion on both sides in an extending direction of the hollow structure, respectively.

16. The back plate according to claim 13 , wherein, as seen from a plan-view diagram parallel to the first main surface of the main body portion, the hollow structure includes a strip structure extending along the first edge of the main body portion, and a plurality of protrusion structures protruding from the strip structure toward the first edge and arranged at intervals in a direction parallel to the first edge.

Assignees

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

Inventors

• Kang Yaling
• Zhang Xiaochu
• Shi Zuchuan
• He Shuyong
• Wu Bo
• Liu Xiang
• Wang Peina

Classifications

• G02B6/009

  of the light source in the package (G02B6/0021 takes precedence) · CPC title

• F21S8/00 Primary

  Lighting devices intended for fixed installation (F21S9/00, F21S10/00 take precedence; using a string or strip of light sources F21S4/00) · CPC title

• F21V19/001

  the light sources being semiconductors devices, e.g. LEDs · CPC title

• F21V17/10

  characterised by specific fastening means or way of fastening (F21V17/02 - F21V17/08 take precedence) · CPC title

• G02B6/0011

  the light guides being planar or of plate-like form · CPC title