Light guide plate and manufacturing method thereof, backlight module, and display apparatus

Patent metadata

Field	Value
Publication number	US-10254471-B2
Application number	US-201615232875-A
Country	US
Kind code	B2
Filing date	Aug 10, 2016
Priority date	Jan 4, 2016
Publication date	Apr 9, 2019
Grant date	Apr 9, 2019

Abstract

Embodiments of the present invention provide a light guide plate for a backlight module. The light guide plate includes: a body comprising: a first surface; a second surface which is opposite to the first surface and serves as a light output surface; and a side face; and a groove formed inside the body and having an opening located in the side face. The groove is configured to accommodate an optical film.

First claim

What is claimed is:

1. A light guide plate for a backlight module, comprising:
a body comprising: a first surface; a second surface which is opposite to the first surface and serves as a light output surface; and a side face; and
a groove formed inside the body and having an opening located in the side face, wherein the groove is configured to accommodate an optical film,
wherein a distance from the groove to the second surface of the light guide plate is less than a distance from the groove to the first surface of the light guide plate.

2. A light guide plate for a backlight module, comprising:
a body comprising: a first surface; a second surface which is opposite to the first surface and serves as a light output surface; and a side face; and
a groove formed inside the body and having an opening located in the side face, wherein the groove is configured to accommodate an optical film,
wherein at least one of a first inner surface of the groove close to the second surface of the light guide plate and a second inner surface of the groove close to the first surface of the light guide plate comprises a light diffusion surface.

3. The light guide plate of claim 1 , wherein:
a volume of the groove is not less than a volume of the optical film.

4. A light guide plate for a backlight module, comprising:
a body comprising: a first surface; a second surface which is opposite to the first surface and serves as a light output surface; and a side face;
a groove formed inside the body and having an opening located in the side face, wherein the groove is configured to accommodate an optical film; and
a lamp recess formed in the side face and configured for placing a backlight source,
wherein an opening of the lamp recess and the opening of the groove are located in the same side face of the light guide plate.

5. The light guide plate of claim 4 , wherein:
the opening of the lamp recess is positioned closer to the first surface of the light guide plate than the opening of the groove.

6. The light guide plate of claim 5 , wherein:
the opening of the lamp recess in the side face adjoins, or is separated by a preset distance from the opening of the groove in the side face.

7. The light guide plate of claim 1 , wherein:
the optical film comprises one or more of:
a brightness enhancement film for condensing light to enhance brightness, a protection film for preventing the brightness enhancement film from being scratched, and a diffusion film for diffusing light.

8. The light guide plate of claim 1 , wherein:
a first inner surface of the groove close to the second surface of the light guide plate and a second inner surface of the groove close to the first surface of the light guide plate have a rectangular shape, a circular shape, an elliptical shape, a sectorial shape, or a triangular shape.

9. The light guide plate of claim 1 , wherein:
the first surface comprises a light diffusion surface.

10. The light guide plate of claim 2 , wherein:
at least one of the first inner surface of the groove close to the second surface of the light guide plate and the second inner surface of the groove close to the first surface of the light guide plate has a concavo-convex microstructure formed thereon, so as to be formed into a light diffusion surface.

11. The light guide plate of claim 9 , wherein:
the first surface has a concavo-convex microstructure formed thereon, so as to be formed into a light diffusion surface.

12. A backlight module comprising:
a light guide plate according to claim 1 .

13. A display apparatus comprising:
a backlight module according to claim 12 .

14. A method of manufacturing a light guide plate according to claim 1 , the method comprising:
forming the groove inside the body, wherein the groove is configured to accommodate an optical film and has the opening located in the side face.

15. The method of claim 14 , wherein:
the forming the groove comprises:
assembling a first mold for forming the body of the light guide plate, with a second mold for forming the groove, to form an injection molding cavity;
injecting plastic for forming the light guide plate into the injection molding cavity; and
removing the second mold and taking out the light guide plate having the groove, after the plastic is solidified.

16. The method of claim 15 , wherein:
at least one of a first inner surface of the groove of the light guide plate close to the second surface of the light guide plate and a second inner surface of the groove close to the first surface of the light guide plate comprises a light diffusion surface, and
the second mold is provided with a plate and the plate has a surface having a surface structure for forming a light diffusion surface.

17. The method of claim 14 , wherein:
the forming the groove comprises:
cutting a hole in the body by feeding a cutting tool a first preset distance from a point of the side face of the light guide plate along a first direction perpendicular to the side face of the light guide plate; and
cutting the groove in the body by feeding the cutting tool a second preset distance along a second direction parallel to the first surface of the light guide plate and perpendicular to the first direction.

18. The method of claim 17 , wherein:
at least one of a first inner surface of the groove of the light guide plate close to the second surface of the light guide plate and a second inner surface of the groove close to the first surface of the light guide plate comprises a light diffusion surface, and
a surface of the cutting tool has a rough structure so that the at least one of the first inner surface and the second inner surface of the groove is formed into a light diffusion surface during the cutting.

19. A backlight module comprising:
a light guide plate according to claim 2 .

20. A backlight module comprising:
a light guide plate according to claim 4 .

Assignees

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

Inventors

• Zhang Xiaochu
• Kang Yaling
• Shi Zuchuan

Classifications

• G02B6/0036

  2-D arrangement of prisms, protrusions, indentations or roughened surfaces · CPC title

• G02B6/0065

  Manufacturing aspects; Material aspects · CPC title

• G02B6/0088 Primary

  of the light guide or other optical sheets in the package · CPC title

• G02B6/0053

  Prismatic sheet or layer; Brightness enhancement element, sheet or layer · CPC title

• G02B6/0021

  for housing at least a part of the light source, e.g. by forming holes or recesses · CPC title