Backlight module and liquid crystal display device

• US 9,482,811 B2
• Filed: 06/25/2013
• Issued: 11/01/2016
• Est. Priority Date: 04/22/2013
• Status: Active Grant

• Current Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Original Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Inventors: Hsiao, Yuchun, Huang, Chong
• Primary Examiner(s): Arendt, Paisley L
• Assistant Examiner(s): Davison, Angela
• Application Number:
  US14/000,628
• Publication Number:
  US 20140313457A1
• Time in Patent Office: 1,225 Days
• Field of Search: 349/65, 349/58, 349/60, 349/64, 349/62, 361/679.01, 361/679.26, 361/679.3, 361/679.55, 361/679.56, 362/615, 362/632, 362/633, 362/634, 362/97.1, 362/97.2, 362/97.4, 362/606, 345/905
• US Class Current: 1/1
• CPC Class Codes: G02B 6/0023 provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
• CPC Class Codes: G02B 6/0088 of the light guide or other optical sheets in the package
• CPC Class Codes: G02F 1/133317 Intermediate frames, e.g. between backlight housing and front frame
• CPC Class Codes: G02F 1/1336 Illuminating devices
• CPC Class Codes: G02F 1/133606 including a specially adapted diffusing, scattering or light controlling members
• CPC Class Codes: G02F 2201/503 Arrangements improving the resistance to shock
• CPC Class Codes: G02F 2201/54 Arrangements for reducing warping-twist

Abstract

The invention provides a backlight module, including: an optical plate and an optical film, wherein at least one edge of optical film being disposed with a protruding ear, protruding ear having a via hole; backlight module further comprising at least a hanging element; wherein a side of the optical plate corresponding to edge of optical film with protruding ear being fixedly connected to hanging element; optical film being disposed on top of optical plate and via hole hanging on hanging element so as to fasten optical film. The backlight module improves the fix reliability of optical plate and prevents from arching up caused by thermal expansion. Because optical plate and optical film expand simultaneously due to heat, the wavy curve of the optical film is avoided and optical quality is improved. The present invention also discloses a liquid crystal display device with the backlight module.

Claims

1. A backlight module, which comprises an optical plate and an optical film, wherein at least one edge of the optical film being disposed with a protruding ear, the protruding ear having a via hole;

the backlight module further comprising at least a hanging element;

wherein a side of the optical plate corresponding to the at least one edge of the optical film with the protruding ear is directly contacted with the hanging element;

the optical film is disposed on top of the optical plate, and the hanging element is inserted through the via hole so as to fasten the optical film.

2. The backlight module as claimed in claim 1, wherein the backlight module further comprises a backboard and at least a stopping element;

the hanging element is of an L-shape formed monolithically by a first board and a second board, with the second board having a width greater than a width of the first board;

the stopping element is of an L-shape formed monolithically by a third board and a fourth board;

wherein the fourth board is perpendicularly fixed to the backboard and forms a stopping space with the third board;

the second board is inserted into the stopping space so that the hanging element moves towards an upper side of the backlight module with respect to the stopping element in response to an expansion of the optical film and of the optical plate upon being subjected to a heat source; and

the first board is fixedly connected to the side of the optical plate and is extended through the via hole of the protruding ear.

3. The backlight module as claimed in claim 2, wherein two sides of an end of the third board extend outwards to form two extending parts;

the width of the second board is greater than the distance between the two extending parts;

the first board is stopped between the two extending parts to restrict the hanging element from moving towards any side of the two sides neighboring the upper side of the backlight module.

4. The backlight module as claimed in claim 3, wherein one side of the optical plate is fixedly adhered to the hanging element.

5. The backlight module as claimed in claim 4, wherein one side of the optical plate is fixedly adhered to the hanging element by double-sided duct tape.

6. The backlight module as claimed in claim 2, wherein the side of the optical plate is fixedly adhered to the hanging element.

7. The backlight module as claimed in claim 2, wherein the hanging element is made of metal and the stopping element is made of plastic.

8. The backlight module as claimed in claim 2, wherein the hanging element is made of metal and the stopping element is made of rubber.

9. The backlight module as claimed in claim 1, wherein the optical plate is a light-guiding plate.

10. The backlight module as claimed in claim 1, wherein the optical plate is a diffuser.

11. A liquid crystal display device, which comprises:

a backlight module and a liquid crystal display panel disposed opposite to the backlight module, wherein the backlight module further comprising;

an optical plate and an optical film, wherein at least one edge of the optical film being disposed with a protruding ear, the protruding ear having a via hole;

the backlight module further comprising at least a hanging element;

wherein a side of the optical plate corresponding to the at least one edge of the optical film with the protruding ear is directly contacted with the hanging element;

the optical film is disposed on top of the optical plate, and the hanging element is inserted through the via hole so as to fasten the optical film.

12. The liquid crystal display device as claimed in claim 11, wherein the backlight module further comprises a backboard and at least a stopping element;

the hanging element is of an L-shape formed monolithically by a first board and a second board, with the second board having a width greater than a width of the first board;

the stopping element is of an L-shape formed monolithically by a third board and a fourth board;

wherein the fourth board is perpendicularly fixed to the backboard and forms a stopping space with the third board;

the second board is inserted into the stopping space so that the hanging element moves towards an upper side of the backlight module with respect to the stopping element in response to an expansion of the optical film and of the optical plate upon being subjected to a heat source; and

the first board is fixedly connected to the side of the optical plate and is extended through the via hole of the protruding ear.

13. The liquid crystal display device as claimed in claim 12, wherein two sides of an end of the third board extend outwards to form two extending parts;

the width of the second board is greater than the distance between the two extending parts;

the first board is stopped between the two extending parts to restrict the hanging element from moving towards any side of the two sides neighboring the upper side of the backlight module.

14. The liquid crystal display device as claimed in claim 13, wherein one side of the optical plate is fixedly adhered to the hanging element.

15. The liquid crystal display device as claimed in claim 14, wherein one side of the optical plate is fixedly adhered to the hanging element by double-sided duct tape.

16. The liquid crystal display device as claimed in claim 12, wherein the side of the optical plate is fixedly adhered to the hanging element.

17. The liquid crystal display device as claimed in claim 12, wherein the hanging element is made of metal and the stopping element is made of plastic.

18. The liquid crystal display device as claimed in claim 12, wherein the hanging element is made of metal and the stopping element is made of rubber.

19. The liquid crystal display device as claimed in claim 11, wherein the optical plate is a light-guiding plate.

20. The liquid crystal display device as claimed in claim 11, wherein the optical plate is a diffuser.