Backlight module and liquid crystal display module

• US 8,508,684 B2
• Filed: 10/06/2010
• Issued: 08/13/2013
• Est. Priority Date: 04/14/2010
• Status: Active Grant

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Pan, Chih-Liang, Hsu, Jeng-Bin, Yeh, Yen-Po, Chen, Yu-Yu, Chen, Ching-Feng, Chang, Yu-Hsiu
• Primary Examiner(s): Vu, Phu
• Application Number:
  US12/898,729
• Publication Number:
  US 20110255026A1
• Time in Patent Office: 1,042 Days
• Field of Search: 349 58- 60
• US Class Current: 349/58
• CPC Class Codes: G02B 6/0088 of the light guide or other optical sheets in the package
• CPC Class Codes: G02B 6/0091 of the light source relative to the light guide G02B6/0021 takes precedence

Abstract

A backlight module includes a tray, a light guide plate, a lighting device, and an optical film set. The tray includes a bottom plate and a side wall connecting an edge of the bottom plate. The side wall includes a plurality of wall portions connected to one another. Some of the wall portions are perpendicular to the bottom plate, and the others are parallel to the bottom plate. The light guide plate is disposed on the bottom plate. The lighting device is disposed at a light incident side of the light guide plate. The optical film set disposed on the light guide plate leans against the side wall.

Claims

1. A backlight module comprising:

a tray comprising a bottom plate and a side wall connecting an edge of the bottom plate, the side wall comprising;

a first wall portion substantially perpendicular to the bottom plate;

a second wall portion substantially parallel to the bottom plate, the second wall portion extending out of the tray;

a third wall portion substantially perpendicular to the bottom plate, the second wall portion being connected between the first wall portion and the third wall portion;

a fourth wall portion substantially parallel to the bottom plate, the fourth wall portion extending out of the tray;

a fifth wall portion substantially perpendicular to the bottom plate, the fourth wall portion being connected between the third wall portion and the fifth wall portion;

a light guide plate disposed on the bottom plate of the tray;

a back frame surrounding the tray, the back frame and the tray leaning against each other, a bottom surface of the tray and a bottom surface of the back frame being substantially coplanar;

a lighting device disposed at a light incident side of the light guide plate; and

an optical film set disposed on the light guide plate, the second wall portion leaning against the optical film set.

2. The backlight module as claimed in claim 1, wherein the side wall of the tray surrounds the light guide plate but exposes the light incident side of the light guide plate.

3. The backlight module as claimed in claim 1, the back frame comprising:

a bottom plate substantially coplanar with the bottom plate of the tray, the bottom plate of the back frame surrounding the bottom plate of the tray; and

a side wall perpendicular to the bottom plate of the back frame, the side wall of the back frame connecting the bottom plate of the back frame and surrounding the side wall of the tray.

4. The backlight module as claimed in claim 3, further comprising a cushion material leaning between the bottom plate of the back frame and the second wall portion of the side wall of the tray or between the bottom plate of the back frame and the fourth wall portion of the side wall of the tray.

5. The backlight module as claimed in claim 4, wherein the cushion material is adhesive, so as to adhere the bottom plate of the back frame and the side wall of the tray.

6. The backlight module as claimed in claim 3, wherein a side of the side wall of the back frame away from the bottom plate of the back frame is bent toward the light guide plate and forms a supporting wall portion, and the supporting wall portion is substantially parallel to the bottom plate of the back frame and leans against the second wall portion or the fourth wall portion of the side wall of the tray.

7. The backlight module as claimed in claim 3, wherein the side wall of the back frame has a first portion corresponding to the light incident side of the light guide plate, a side of the first portion away from the bottom plate of the back frame is bent toward the light guide plate and forms a clamping wall portion, a light source accommodation space is formed between the clamping wall portion and the bottom plate of the back frame, and the light incident side of the light guide plate is inserted into the light source accommodation space.

8. The backlight module as claimed in claim 7, wherein the lighting device is located in the light source accommodation space and disposed on the clamping wall portion.

9. The backlight module as claimed in claim 1, the side wall of the tray surrounding the light guide plate, the side wall of the tray located at the light incident side comprising a sixth wall portion substantially perpendicular to the bottom plate of the tray, a height of a top of the sixth wall portion relative to a height of the bottom plate of the tray being substantially less than a height of a top of the third wall portion relative to the height of the bottom plate of the tray, the backlight module further comprising a holder located at the light incident side and leaning against the sixth wall portion.

10. The backlight module as claimed in claim 9, the holder comprising:

a first leaning wall substantially parallel to the sixth wall portion, the first leaning wall leaning against the sixth wall portion; and

a second leaning wall extending from the first leaning wall to the light incident side of the light guide plate, the second leaning wall and the fourth wall portion of the tray together holding a liquid crystal display panel, a light source accommodation space being formed between the second leaning wall, the bottom plate of the tray, and the sixth wall portion, the light incident side of the light guide plate being clamped by the second leaning wall and the bottom plate of the tray.

11. The backlight module as claimed in claim 10, wherein the lighting device comprises a holding board and a light emitting device, the holding board is disposed on the second leaning wall, and the light emitting device is disposed on the holding board and emits a light beam into the light guide plate.

12. The backlight module as claimed in claim 1, the second wall portion having a first surface and a second surface opposite to the first surface, the optical film set being located on the first surface, the backlight module further comprising a positioning element disposed between the optical film set and the first surface, wherein the positioning element has a positioning protrusion, the optical film set has a positioning hole, and the positioning protrusion is located in the positioning hole.

13. The backlight module as claimed in claim 1, the second wall portion having a first surface, a second surface opposite to the first surface, and a through hole communicating the first surface and the second surface, the optical film set being located on the first surface, the backlight module further comprising:

a positioning element disposed on the second surface and having a positioning protrusion passing through the through hole and protruding from the first surface, the positioning protrusion being located in a positioning hole of the optical film set.

14. A liquid crystal display module comprising:

a tray comprising a bottom plate and a side wall connecting an edge of the bottom plate, the side wall comprising;

a first wall portion substantially perpendicular to the bottom plate;

a second wall portion substantially parallel to the bottom plate, the second wall portion extending out of the tray;

a third wall portion substantially perpendicular to the bottom plate, the second wall portion being connected between the first wall portion and the third wall portion;

a fourth wall portion substantially parallel to the bottom plate, the fourth wall portion extending out of the tray;

a fifth wall portion substantially perpendicular to the bottom plate, the fourth wall portion being connected between the third wall portion and the fifth wall portion;

a light guide plate disposed on the bottom plate of the tray;

a lighting device disposed at a light incident side of the light guide plate;

an optical film set disposed on the light guide plate, the second wall portion leaning against the optical film set;

a liquid crystal display panel disposed over the optical film set, the fourth wall portion leaning against the liquid crystal display panel; and

a flexible encapsulating material covering a portion of the liquid crystal display panel and a portion of the bottom plate of the tray, so as to fix the liquid crystal display panel and the tray together.

15. The liquid crystal display module as claimed in claim 14, wherein the side wall of the tray surrounds the light guide plate but exposes the light incident side of the light guide plate, and the backlight module further comprises:

a back frame surrounding the tray, the back frame and the tray leaning against each other, a bottom surface of the tray and a bottom surface of the back frame being substantially coplanar, wherein the flexible encapsulating material surrounds the back frame and fixes the liquid crystal display panel, the back frame, and the tray together.

16. The liquid crystal display module as claimed in claim 15, the back frame comprising:

a bottom plate substantially coplanar with the bottom plate of the tray, the bottom plate of the back frame surrounding the bottom plate of the tray; and

a side wall perpendicular to the bottom plate of the back frame, the side wall of the back frame connecting the bottom plate of the back frame and surrounding the side wall of the tray.

17. The liquid crystal display module as claimed in claim 16, further comprising a first cushion material leaning between the bottom plate of the back frame and the second wall portion of the side wall of the tray or between the bottom plate of the back frame and the fourth wall portion of the side wall of the tray.

18. The liquid crystal display module as claimed in claim 17, wherein the first cushion material is adhesive, so as to adhere the bottom plate of the back frame and the side wall of the tray.

19. The liquid crystal display module as claimed in claim 16, wherein a side of the side wall of the back frame away from the bottom plate of the back frame is bent toward the light guide plate and forms a supporting wall portion, and the supporting wall portion is substantially parallel to the bottom plate of the back frame and leans against the second wall portion or the fourth wall portion of the side wall of the tray.

20. The liquid crystal display module as claimed in claim 16, wherein the side wall of the back frame has a first portion corresponding to the light incident side of the light guide plate, a side of the first portion away from the bottom plate of the back frame is bent toward the light guide plate and forms a clamping wall portion, a light source accommodation space is formed between the clamping wall portion and the bottom plate of the back frame, the light incident side of the light guide plate is inserted into the light source accommodation space, and the liquid crystal display panel is disposed on the clamping wall portion.

21. The liquid crystal display module as claimed in claim 20, wherein the lighting device is located in the light source accommodation space and disposed on the clamping wall portion.

22. The liquid crystal display module as claimed in claim 20, further comprising:

a holder disposed on the back frame and located at the light incident side of the light guide plate; and

a second cushion material disposed on the clamping wall portion of the side wall of the back frame and leaning between the holder and the liquid crystal display panel.

23. The liquid crystal display module as claimed in claim 22, wherein the holder has a holding board extending toward a direction away from the lighting device, and the second cushion material is located between the stop board and the liquid crystal display panel.

24. The liquid crystal display module as claimed in claim 14, the side wall of the tray surrounding the light guide plate, the side wall of the tray located at the light incident side comprising a sixth wall portion substantially perpendicular to the bottom plate of the tray, a height of a top of the sixth wall portion relative to a height of the bottom plate of the tray being substantially less than a height of a top of the third wall portion relative to the height of the bottom plate of the tray, the backlight module further comprising a holder located at the light incident side and leaning against the sixth wall portion, the flexible encapsulating material encapsulating and fixing the liquid crystal display panel, the back frame, and the tray together.

25. The liquid crystal display module as claimed in claim 24, the holder comprising:

a first leaning wall being substantially parallel to and leaning against the sixth wall portion; and

a second leaning wall extending from the first leaning wall to the light incident side of the light guide plate, the second leaning wall and the fourth wall portion of the tray together holding the liquid crystal display panel, a light source accommodation space being formed between the second leaning wall, the bottom plate of the tray, and the sixth wall portion, the light incident side of the light guide plate being clamped by the second leaning wall and the bottom plate of the tray, the lighting device being located in the light source accommodation space.

26. The liquid crystal display module as claimed in claim 25, wherein the lighting device comprises a holding board and a light emitting device, the holding board is disposed on the second leaning wall, and the light emitting device is disposed on the holding board and emits a light beam into the light guide plate.

27. The liquid crystal display module as claimed in claim 25, the holder further comprising an adhesive layer disposed between the second leaning wall and the liquid crystal display panel.

28. The liquid crystal display module as claimed in claim 24, wherein the holder has a holding board extending toward a direction away from the lighting device and located around the liquid crystal display panel.

29. The liquid crystal display module as claimed in claim 28, further comprising a cushion material disposed between the stop board and the liquid crystal display panel.

30. The liquid crystal display module as claimed in claim 24, wherein the holder further comprises a holding portion parallel to the second leaning wall and extending toward a direction away from the liquid crystal display panel, and the liquid crystal display module further comprises a circuit board electrically connected to the liquid crystal display panel and disposed on the holding portion.

31. The liquid crystal display module as claimed in claim 14, the second wall portion having a first surface and a second surface opposite to the first surface, the optical film set being located on the first surface, the backlight module further comprising:

a positioning element disposed between the optical film set and the first surface, the positioning element having a positioning protrusion, the optical film set having a positioning hole, the positioning protrusion being located in the positioning hole.

32. The liquid crystal display module as claimed in claim 14, the second wall portion having a first surface, a second surface opposite to the first surface, and a through hole communicating the first surface and the second surface, the optical film set being located on the first surface, the backlight module further comprising:

a positioning element disposed on the second surface and having a positioning protrusion passing through the through hole and protruding from the first surface, the positioning protrusion being located in a positioning hole of the optical film set.