OPTICAL FILM, BACKLIGHT MODULE AND LIQUID CRYSTAL DISPLAY DEVICE

Abstract

The present disclosure discloses an optical film, a backlight module and a liquid crystal display device and relates to the liquid crystal display field. It solves the problem that the edge of an optical film in the prior art can be easily warped. An optical film is provided and comprises an optical film body, and at a position of the optical film body that is close to a heat source, a thermal expansion stretchable structure is provided and is capable of releasing a thermal expansion amount of the optical film body.

Claims

1. An optical film comprising an optical film body, wherein at a position of the optical film body that is close to a heat source, a thermal expansion stretchable structure is provided and is capable of releasing a thermal expansion amount of the optical film body.

2. The optical film according to claim 1, wherein the heat expansion stretchable structure is a through hole arranged in the optical film body.

3. The optical film according to claim 1, wherein the heat expansion stretchable structure is a notch arranged in the optical film body.

4. The optical film according to claim 2, wherein the through hole is in a regular or irregular shape.

5. The optical film according to claim 2, wherein the through hole is in an inverted trapezoidal, a rectangular or a circular shape.

6. The optical film according to claim 3, wherein the notch comprises one or more slots.

7. The optical film according to claim 1, wherein the heat expansion stretchable structure further comprises a thermally conductive depression bar press fitted on the thermal expansion stretchable structure.

8. A backlight module, wherein the backlight module comprises the optical film according to claim 1.

9. A liquid crystal display device, wherein the liquid crystal display device comprises the optical film according to claim 1.

10. The liquid crystal display device according to claim 9, wherein the thermal expansion stretchable structure extends into a visible area of the liquid crystal display device.

11. The optical film according to claim 4, wherein the through hole is in an inverted trapezoidal, a rectangular or a circular shape.

12. A backlight module, wherein the backlight module comprises the optical film according to claim 2.

13. A backlight module, wherein the backlight module comprises the optical film according to claim 3.

14. A backlight module, wherein the backlight module comprises the optical film according to claim 4.

15. A backlight module, wherein the backlight module comprises the optical film according to claim 5.

16. A backlight module, wherein the backlight module comprises the optical film according to claim 11.

17. A backlight module, wherein the backlight module comprises the optical film according to claim 6.

18. A backlight module, wherein the backlight module comprises the optical film according to claim 7.

19. A liquid crystal display device, wherein the liquid crystal display device comprises the optical film according to claim 2.

20. A liquid crystal display device, wherein the liquid crystal display device comprises the optical film according to claim 3.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG. 1 is a schematic diagram of the structure of an optical film provided by an embodiment of the present disclosure;

[0020] FIG. 2 is a schematic diagram of the structure of another optical film provided by an embodiment of the present disclosure;

[0021] FIG. 3 is a schematic diagram of the structure of a further optical film provided by an embodiment of the present disclosure.

DETAILED DESCRIPTION

[0022] The embodiments of the present disclosure are described below in detail in conjunction with the accompanying drawings.

[0023] In an embodiment of the present disclosure, an optical film is provided and comprises an optical film body, and at a position of the optical film body that is close to a heat source, a thermal expansion stretchable structure is provided and is capable of releasing a thermal expansion amount of the optical film body, such that the thermal expansion amount of the optical film body is released, whereby the edge of the optical film at a position close to the heat source receives a better flatness thus avoiding warps that may occur to the edge of the optical film.

[0024] Referring to FIG. 1, in the above embodiment, the thermal expansion stretchable structure may be a notch 103 arranged in the optical film body 102. The notch 103 is capable of releasing a thermal expansion amount of the optical film close to the heat source, such that the optical film can be maintained with a better flatness. The shape of the notch 103 can be trapezoidal, rectangular or others. Therein, the notch 103 may extend to a visible area 101.

[0025] Referring to FIG. 2, in the above embodiment, the notch 103 may comprise slots 203, the width of which can be set according to practical circumstances. The slots 203 may have a length that extends to a visible area 201, so that the slots 203 can better release the thermal expansion amount of the optical film body 202. Since the viewing distance of a larger sized liquid crystal display or television set is larger, the part of the slots 203 that extends to the visible area 201 would not cause serious impact on the display image.

[0026] In order to enhance the thermal expansion amount releasing effect of the slot, there may be provided a plurality of the slots 203.

[0027] Referring to FIG. 3, in the above embodiment, the thermal expansion stretchable structure may be a through hole 303 arranged in the optical film body 302. When the optical film body 302 gets close to the heat source, the through hole 303 thereon can accelerate the releasing for the thermal expansion of the optical film body 302, so as to realize as soon as possible the release of the optical film thermal expansion amount and thereby avoid warps that may occur to the edge of the optical film. Specifically, the through hole 303 may be an inverted trapezoidal or a rectangular shape. Of course, the shape of the through hole 303 is not limited to the inverted trapezoid or rectangle, and it may have other shapes as well, such as a circular shape. The through hole 303 may be in a regular or irregular shape. For example, the through hole 303 may be a polygon.

[0028] It should be clear that the thermal expansion stretchable structure may further comprise a thermally conductive depression bar press fitted on the thermal expansion stretchable structure. The thermally conductive depression bar is capable of absorbing and releasing the thermal expansion amount of the optical film body. Moreover, the thermally conductive depression bar can play a function of tightening the edge of the optical film that is close to the heat source, to thus avoid deformations or warps that may occur to the edge of the optical film due to thermal expansion.

[0029] In an embodiment of the present disclosure, a backlight module is also provided and comprises the above optical film. The optical film comprises an optical film body, and at a position of the optical film body that is close to a heat source, a thermal expansion stretchable structure is provided and is capable of releasing a thermal expansion amount of the optical film body, such that the thermal expansion amount of the optical film body is released, whereby the edge of the optical film at a position close to the heat source receives a better flatness thus avoiding warps that may occur to the edge of the optical film.

[0030] In an embodiment of the present disclosure, a liquid crystal display device is also provided and comprises the above optical film. The optical film comprises an optical film body, and at a position of the optical film body that is close to a heat source, a thermal expansion stretchable structure is provided and is capable of releasing a thermal expansion amount of the optical film body, such that the thermal expansion amount of the optical film body is released, whereby the edge of the optical film at a position close to the heat source receives a better flatness thus avoiding warps that may occur to the edge of the optical film.

[0031] In this description, the specific features, structures, materials or characteristics can be combined in any appropriate manner(s) in any one or more embodiments or examples.

[0032] The above are the specific embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto. Various of variations or replacements within the technical scope revealed by the present disclosure easily occur to any skilled persons in the art, and this should also be included in the scope of the present disclosure. Therefore, the scope of the present disclosure should be according to the scope of the claims.