1. Field of the Invention
The present invention relates to a liquid crystal displaying technology field, and more particularly to a backlight module and a liquid crystal display.
2. Description of the Prior Art
With the continuous development of a liquid crystal display, the demand for the function of every component of the liquid crystal display becomes more and more high.
Please refer to
Wherein, the optical collimator 12 adopts a paraboloidal reflector, the light source 11 is mounted within the optical collimator 12 and is enclosed by the optical collimator 12, and an exit of the optical collimator 12 is aligned with a light guide region formed between the optical film 13 and the reflection sheet 14. The optical collimator 12 approximately collimates the lights of the light source 11 to directly project into the light guide region between the optical film 13 and the reflection sheet 14. For the lights entering into the light guide region, one part thereof is directly incident to the optical film 13, and the other part thereof is reflected by the reflection sheet 14 to enter into the optical film 13.
Because the size of the optical collimator 12 is large and the length L′ thereof is generally over 15 millimeter, it takes up more space and limits the developing trend of the narrow frame of the backlight module.
One object of the present invention is to provide a backlight module to solve the technical problems of taking up more space and limiting the developing trend of the narrow frame of the backlight module because of the presence of the optical collimator and the length of optical collimator being longer in the prior art.
For solving above problems, the present invention provides a backlight module, comprising at least one light source, an optical film and a reflection plate being parallel to each other. There forms a light guide region between the optical film and the reflection plate. The length of the light guide region is equal to that of one having the longer length of the optical film and the reflection plate.
The backlight module also comprises a curved reflection sheet. One end of the curved reflection sheet extends into the light guide region along a length direction of the optical film and is connected to the reflection plate, and the other end of the curved reflection sheet and the optical film are respectively located at two opposite sides of the light source.
The light source is long bar-shaped. A center line along a length direction of the light source is located in a plane of the optical film. The light source includes a light-emitting surface. The light-emitting surface faces the curved reflection sheet and the reflection plate. All the lights emitted by the light source are projected to the curved reflection sheet and the reflection plate, and then reflected by the curved reflection sheet and the reflection plate to enter into the optical film.
In the backlight module of the present invention, the light-emitting surface of the light source is located on the plane of the optical film.
Wherein the length of the optical film is greater than that of the reflection plate, the one end of the curved reflection sheet extending into the light guide region is connected to one end of the reflection plate near the light source.
In the backlight module of the present invention, the curved reflection sheet is a half paraboloidal reflection cover, which has a center line defined by a top point and a focus thereof, the center line has a default angle relative to the light-emitting surface of the light source, and a range of the default angle is 0 degree to 20 degrees.
In the backlight module of the present invention, the center line of the curved reflection sheet rotates relative to the optical film to form the default angle.
In the backlight module of the present invention, the light source rotates relative to the optical film to form the default angle.
In the backlight module of the present invention, the light guide module comprises two light sources being oppositely symmetrical to the optical film.
If the default angle is formed by the clockwise rotation of the light source, a middle position of the reflection plate disposes a concave structure.
If the default angle is fanned by the anticlockwise rotation of the center line of the curved reflection sheet relative to the optical film, the middle position of the reflection plate disposes a convex structure.
In the backlight module of the present invention, the curved reflection sheet is constructed by multiple plane bending sections, and one plane bending section thereof near the light source is perpendicular to the optical film.
In the backlight module of the present invention, the curved reflection sheet is a smooth curved surface, the slope of which is gradually increased along the length direction of the optical film.
In the backlight module of the present invention, the curved reflection sheet and the reflection plate are integrally formed.
Another object of the present invention is to provide a backlight module to solve the technical problems of taking up more space and limiting the developing trend of the narrow frame of the backlight module because of the presence of the optical collimator and the length of optical collimator being longer in the prior art.
For solving above problems, the present invention provides a backlight module comprising at least one light source, an optical film and a reflection plate being parallel to each other. There forms a light guide region between the optical film and the reflection plate. The length of the light guide region is equal to that of one having the longer length of the optical film and the reflection plate.
The backlight module also comprises a curved reflection sheet. One end of the curved reflection sheet extends into the light guide region along a length direction of the optical film and is connected to the reflection plate, and the other end of the curved reflection sheet and the optical film are respectively located at two opposite sides of the light source.
The light source includes a light-emitting surface. The light-emitting surface faces the curved reflection sheet and the reflection plate. All the lights emitted by the light source are projected to the curved reflection sheet and the reflection plate, and then reflected by the curved reflection sheet and the reflection plate to enter into the optical film.
In the backlight module of the present invention, the light-emitting surface of the light source is located on the plane of the optical film.
Wherein the length of the optical film is greater than that of the reflection plate, the one end of the curved reflection sheet extending into the light guide region is connected to one end of the reflection plate near the light source.
In the backlight module of the present invention, the curved reflection sheet is a half paraboloidal reflection cover, which has a center line defined by a top point and a focus thereof, the center line has a default angle relative to the light-emitting surface of the light source, and a range of the default angle is 0 degree to 20 degrees.
In the backlight module of the present invention, the center line of the curved reflection sheet rotates relative to the optical film to form the default angle.
In the backlight module of the present invention, the light source rotates relative to the optical film to form the default angle.
In the backlight module of the present invention, the light guide module comprises two light sources being oppositely symmetrical to the optical film.
If the default angle is formed by the clockwise rotation of the light source, a middle position of the reflection plate disposes a concave structure.
If the default angle is formed by the anticlockwise rotation of the center line of the curved reflection sheet relative to the optical film, the middle position of the reflection plate disposes a convex structure.
In the backlight module of the present invention, the curved reflection sheet is constructed by multiple plane bending sections, and one plane bending section thereof near the light source is perpendicular to the optical film.
In the backlight module of the present invention, the curved reflection sheet is a smooth curved surface, the slope of which is gradually increased along the length direction of the optical film.
In the backlight module of the present invention, the curved reflection sheet and the reflection plate are integrally formed.
Another object of the present invention is to provide a liquid crystal display to solve the technical problems of taking up more space and limiting the developing trend of the narrow frame of the backlight module because of the presence of the optical collimator and the length of optical collimator being longer in the prior art.
For solving above problems, the present invention provides a liquid crystal display. The liquid crystal display comprises a backlight module. The backlight module comprises at least one light source, an optical film and a reflection plate being parallel to each other. There forms a light guide region between the optical film and the reflection plate. The length of the light guide region is equal to that of one having the longer length of the optical film and the reflection plate.
The backlight module also comprises a curved reflection sheet. One end of the curved reflection sheet extends into the light guide region along a length direction of the optical film and is connected to the reflection plate, and the other end of the curved reflection sheet and the optical film are respectively located at two opposite sides of the light source.
The light source includes a light-emitting surface. The light-emitting surface faces the curved reflection sheet and the reflection plate. All the lights emitted by the light source are projected to the curved reflection sheet and the reflection plate, and then reflected by the curved reflection sheet and the reflection plate to enter into the optical film.
Comparing with the prior art, the present invention employs the curved reflection sheet to replace the optical collimator of the prior art. One end of the curved reflection sheet may extend into the light guide region, and the other end thereof is disposed near the light source. The light-emitting surface of the light source faces the curved reflection sheet and the reflection plate. The lights emitted by the light source are all projected to the curved reflection sheet and the reflection plate. Obviously, because the curved reflection sheet may extend into the light guide region along the length direction of the optical film, the present invention can reduce the length of the backlight module and can assure the light guide effect.
For more clearly and easily understanding above content of the present invention, the following text will take a preferred embodiment of the present invention with reference to the accompanying drawings for detail description as follows.
The following description of every embodiment with reference to the accompanying drawings is used to exemplify a specific embodiment, which may be carried out in the present invention.
The backlight module comprises an optical film. 21, a reflection plate 22, a light source 23 and a curved reflection sheet 24. The optical film 21 and the reflection plate 22 are parallel to each other. There forms a light guide region Q between the optical film 21 and the reflection plate 22. The light source 23 includes a light-emitting surface 231.
Wherein, along a length direction A of the optical film 21, the light guide region Q has a length (not shown in drawings). The length of the light guide region Q is determined by one having the longer length of the optical film 21 and the reflection plate 22. For example, if the length of the optical film 21 is greater than that of the reflection plate 22, the length of the light guide region Q is the length of the optical film 21.
Please refer to
Please refer to
Specifically, in the embodiment shown by
In this embodiment, the light-emitting surface 231 of the light source 23 faces the curved reflection sheet 24 and the reflection plate 22. The present invention may control the orientation of the light-emitting surface 231 so that the lights emitted from the light-emitting surface 231 are all projected to the curved reflection sheet 24 and the reflection plate 22, and are reflected by the curved reflection sheet 24 and the reflection plate 22 to enter into the optical film 21.
In the first preferred embodiment of
In the specific implementation process, above default angle θ is obtained by the following two ways:
first, controlling the light-emitting surface 231 of the light source 23 and the optical film 21 to be coplanar, and controlling the center line OF of the curved reflection sheet 24 to anticlockwise rotate the angle θ relative to the optical film 21, please refer to
second, maintaining the center line OF of the curved reflection sheet 24 to be invariable along the direction A shown by
The present invention can control the default angle θ of the curved reflection sheet 24 relative to the light-emitting surface 231 of the light source 23, so the lights emitted by the light source 23 are all projected to the curved reflection sheet 24 and the reflection plate 22, and the curved reflection sheet 24 and the reflection plate 22 can reflect the lights coining from the light source 23 into the light guide region Q, thereby realizing a preferred light-coupling effect.
Wherein, the first preferred embodiment of
When the backlight module works, because the light-emitting surface 231 of the light source 23 faces the curved reflection sheet 24 and the reflection plate 22, the lights emitted from the light source 23 are projected to the curved reflection sheet 24 and the reflection plate 22, and are reflected by the curved reflection sheet 24 and the reflection plate 22 to enter into the optical film 21.
The center line M of the light-emitting surface 231 of the light source 23 along the length direction B thereof shown in
One end 241 of the curved reflection sheet 24 extends into the light guide region Q, and the other end 242 is located one side of the light source 23. Accordingly, the light source 23 and the curved reflection sheet 24 may be freely moved along the direction A shown in
Moreover, after the lights emitted from the light source 23 are reflected by the curved reflection sheet 24 and the reflection plate 22, the lights all can enter into the optical film 21, thereby better assuring the light guide effect of the backlight module.
The difference with the first preferred embodiment shown in
In detail, the backlight module comprises the optical film 21, the reflection plate 22, two curved reflection sheets 24 respectively located two ends of the reflection plate 22, and two light sources 23 respectively located at two sides of the optical film 21. The optical film 21 and the reflection plate 22 are parallel to each other. There forms the light guide region Q between the optical film 21 and the reflection plate 22. The two light sources 23 both include the light-emitting surface 231. The light-emitting surface 231 faces to the curved reflection sheet 24 and the reflection plate 22.
As shown in
In the second embodiment shown by
Please refer to
Certainly, if the light-emitting surface 231 of each light source 23 clockwise rotates the angle θ relative to the optical film 21, the middle position of the reflection plate 22 forms a concave structure. Of course, the concave structure is a gradient-type concave, so no more given a drawing herein.
The difference with the first preferred embodiment shown in
Of course, the curved reflection sheet 24 also may be used in the double side-light mode, so no more repeated herein.
The difference with the first preferred embodiment shown in
The working principle of the backlight module of the second to fourth preferred embodiments can refer to the above description of the working principle of the backlight module of the first preferred embodiment of
The present invention also provides a liquid crystal display, which comprises the backlight module provided by the present invention. Because the backlight module has been described in detail in the above text, no more repeated it herein.
In a word, the present invention employs the curved reflection sheet to replace the paraboloidal reflector of the prior art. One end of the curved reflection sheet may extend into the light guide region, and the other end thereof is disposed at one side of the light source. The light-emitting surface of the light source faces the curved reflection sheet and the reflection plate. The lights emitted by the light source are all projected to the curved reflection sheet and the reflection plate. Obviously, because the curved reflection sheet may extend into the light guide region along the length direction of the optical film, the present invention can reduce the length of the backlight module and can assure the light guide effect.
In conclusion, although the present invention has been disclosed by above preferred embodiments, above preferred embodiments are not used to limit the present invention. One of ordinary skills in the art also can make all sorts of improvements and amendments within the principles of the present invention. Therefore, the protection scope of the present invention should be based on the scope defined by the appended claims.
Number | Date | Country | Kind |
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201210110850.8 | Apr 2012 | CN | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/CN12/74588 | 4/24/2012 | WO | 00 | 5/24/2012 |