The present application claims a priority of the Chinese patent application No. 201210537487.8 entitled “backlight module and display device”, which is incorporated herein by reference in its entirety.
1. Field of the Invention
The present invention relates to a field of liquid crystal display technology, in particular to a backlight module and a display device.
2. Description of the Prior Art
Currently, liquid crystal display (LCD) is a commonly used flat panel display, and it includes a backlight module as an important part for serving as a light source for a liquid crystal panel during the operation of the LCD. According to different incident positions of the light, the backlight module includes side-type backlight module and direct-type backlight module. For the direct-type backlight module, a light source such as a CCFL (Cold Cathode Fluorescent Lamp) or LED (Light Emitting Diode) is positioned behind the liquid crystal panel, so as to directly provide the area light to the liquid crystal panel. For the side-type backlight module, a LED light bar is positioned at an edge of a back plate of the liquid crystal panel. The light from the LED light bar enters a light guide plate (LGP) from a light-entering surface at a side of the LGP, emerges out from a light-exiting surface of the LGP upon reflection and diffusion, and then passes through optical films to form the area light to be provided to the liquid crystal panel.
The traditional side-type backlight module comprises a outer frame, a rubber frame, a back plate, a LED light bar and a light guide plate, and so on.
An object of the present invention is to provide a backlight module, so as to increase the brightness of a light guide plate, prevent a brightness loss of the light from a LED light source, and improve the utilization rate of the LED light source.
In one aspect, the technical solution (1) according to the present invention provides a backlight module comprises a light guide plate including a light-entering surface, a light-exiting surface adjacent to the light-entering surface, and a back surface opposite to the light-exiting surface; a LED light bar including a plurality of LED lamps arranged at intervals. The LED light bar is arranged at a side of the light guide plate so as to emit the light to the light-entering surface of the light guide plate, and a gap is provided between the LED light bar and the light guide plate; and a reflection member is arranged outside the gap. A reflection. surface of the reflection member faces the gap so as to reflect the light from the LED light bar toward the light-entering surface of the light guide plate. First regions and second regions are arranged on the reflection surface of the reflection member at intervals, and a position. of each first region corresponds to a position of each LED lamp, and a position of each second region corresponds to a position between two adjacent LED lamps or a position outside of the LED lamps on the end of the LED light bar, and the first region has a reflective index less than the second region.
In a preferable backlight module, the reflection member includes a first reflector arranged at a side of the light-exiting surface of the light guide plate, and an end of the first reflector adjacent to the light guide plate is inclined toward the light-exiting surface of the light guide plate, and there is a first inclination angle between a reflection surface of the first reflector and the light-exiting surface of the light guide plate.
In a further preferable backlight module, the first inclination angle is about 8° to 28°.
In a further preferable backlight module, further comprises a rubber frame, at least a part of which is arranged at a side of the light-exiting surface of the light guide plate and covers the gap, and the first reflector is fixed to a position where the rubber frame covers the gap.
In a further preferable backlight module, a sealing sheet is provided at a slit between the end of the first reflector adjacent to the light guide plate and the light-exiting surface of the light guide plate, so as to prevent the light from the LED light bar from passing through the slit between the first reflector and the light guide plate.
In a further preferable backlight module, the reflection member further includes a second reflector arranged opposite to the first reflector, an end of the second reflector adjacent to the light guide plate is inclined toward the back surface of the light guide plate, and there is a second inclination angle between a reflection surface of the second reflector and the back surface of the light guide plate.
In a further preferable backlight module, the second inclination angle is about 8° to 28°.
In a further preferable backlight module, a bottom reflection sheet is arranged at a side of the back surface of the light guide plate, and the second reflector is fixed to an end of the bottom reflection sheet adjacent to the LED Light bar, or is integrally formed with the bottom reflection sheet.
In a further preferable backlight module, each first region is formed by an adhesive belt provided between the second regions of the reflection member or by a coating coated between the second regions of the reflection member.
In a further preferable backlight module, the color of the adhesive belt or the coating is black.
In a further preferable backlight module, a distance between luminescent centers of the adjacent LED lamps in the LED Light bar is about 6.9 to 9 mm and the width of each first region is about 2 to 3 mm.
In a further preferable backlight module, the reflection member comprises a main body formed by a black body, and reflection sheets arranged at intervals on the main body at the positions corresponding to the second regions, and the regions without the reflection sheets are the first regions.
In another aspect, the present invention provides a display device comprising the above-mentioned backlight module.
The present invention has the following advantageous effects. According to the backlight module of the present invention, the reflection member is arranged outside the gap between the LED light bar and the light guide plate, so as to meet the requirement of a large gap between the LED Light bar and the light guide plate in terms of thermology, and to improve the utilization rate of the light source. In addition, a position of each first region corresponds to a position of each LED lamp, and a position of each second region corresponds to a position between two adjacent LED lamps or a position outside of the LED lamps on the end of the LED light bar, and the first region has a reflective index less than the second region, so as to reflect the light at the intervals between the LED lamps and/or outside the LED lamps at the end of the LED light bar to the light guide plate as much as possible, thereby to achieve even light intensity and reduce hot spots.
To make the objects, the technical solutions and the advantages of the present invention more apparent, the present invention will be described hereinafter in conjunction with the drawings and the embodiments.
In one embodiment of the present invention, the reflection member 400 arranged outside the gap G (i.e., at upper and lower sides thereof as shown in
As shown in
According to the backlight module of the present invention, the reflection member 400 is arranged at the gap between the LED light bar 200 and the light guide plate 100, so as to meet the requirement of a large gap between the LED light bar 200 and the light guide plate 100 in terms of thermology, and to improve the utilization rate of the light source. In addition, the first regions 4001 corresponding to the positions of the LED lamps 201 and the second regions 4002 corresponding to the positions of the intervals between. the LED lamps 201 and/or a position outside the LED lamps 201 at the end of the LED light bar 200 and having a reflective index greater than the first regions 4001 are arranged on the reflection surface of the reflection member 400, so as to reflect the light at the intervals between the LED lamps 201 and/or outside the LED lamps 201 at the end of the LED light bar 200 to the light guide plate 100 as much as possible, thereby to achieve even light intensity and reduce hot spots.
Preferably, the reflection member 400 may be arranged at an upper side of the gap G, i.e., at a side of the light-exiting surface 102 of the light guide plate 100, and cover the gap G. Also, the reflection member 400 may be arranged at a lower side of the gap G, i.e., at a side of the back surface 103 of the light guide plate 100, and cover the gap G. Further, the reflection member 400 may be arranged at the side of the light-exiting surface 102 of the light guide plate 100 and the side of the back surface 103 of the light guide plate 100 respectively, and cover the gap, as shown in
In a preferred embodiment, as shown in
An end of the second reflector 402 adjacent to the light guide plate 100 is inclined toward the back surface 103 of the light guide plate 100, so that there is a second inclination angle β between the reflection surface of the second reflector 402 and the back surface 103 of the light guide plate 100. In other words, the first reflector 401 and the second reflector 402 form a reflection cover between the LED light bar 200 and the light guide plate 100 so as to surround the light source, and the reflection cover converges to an end adjacent to the light guide plate 100 from an end adjacent to the LED light bar 200. As a result, it is able to maximally reflect the light from the LED light bar 200 to the light-entering surface 101 of the light guide plate 100, and to improve the light incidence rate.
The first inclination angle α is preferably 8° to 28°, and more preferably, 10° to 20°, so as to reflect the light to the light-entering surface 101 of the light guide plate 100 as much as possible.
The second inclination angle β is preferably 8° to 28°, and more preferably, 10° to 20°, so as to reflect the light to the light-entering surface 101 of the light guide plate 100 as much as possible.
In a further preferred embodiment, the first reflector 401 and the second reflector 402 are preferably fixed by the following ways.
As shown in
Further preferably, a bottom reflector 600 is arranged at the back surface 103 of the guide light plate 100, and the second reflector 402 is fixed to an end of the bottom reflector 600 adjacent to the LEI) light bar 200. The second reflector 402 may also be integrally formed with the bottom reflector 600.
It is to be noted that, the fixation of the first reflector 401 and the second reflector 402 is not limited to the above-mentioned ways.
More preferably, a face of the outer frame 300 to which the first reflector 401 is fixed is an oblique surface, so that the obliquely arranged first reflector 401 can be fixed thereto.
More preferably, a sealing sheet 500 is provided at a slit between the end of the first reflector 401 adjacent to the light guide plate 100 and the light-exiting surface 102 of the light guide plate 100, so as to prevent a bright line formed when the light from the LED light bar 200 passes through the slit between the first reflector 401 and the light-exiting surface 102 of the light guide plate 100.
In a further preferred embodiment, it is to be noted that, the first region 4001 may be formed by an adhesive belt provided between the second regions 4002 of the reflection member 400 (i.e. the first reflector 401 and/or the second reflector 402) or by a coating coated between the second regions 4002 of the reflection member 400. It should be appreciated that, in practical application, the first region 4001 may be formed by the other ways, which are not listed herein.
Preferably, the first region 4001 is formed by a black adhesive belt provided between the second regions 4002 of the reflection member 400 or by a black coating coated between the second regions 4002 of the reflection member 400, so as to form a non-reflective region with a black surface. Such a non-reflective region has an excellent light absorption property, and can reflect the light from the LED lamps 201 as little as possible. As a result, it is able to achieve even light intensity.
In a further preferred embodiment, the first reflector 401 and the second reflector 402 may have a main body formed by a black body, such as a black adhesive belt or black coating, with small reflectors arranged at intervals on the main body at the positions corresponding to the positions of the intervals between the LED lamps 201. Each small reflector is just a second region 4002, and the regions without the small reflectors are just the first regions 4001 arranged at intervals.
In addition, the main body formed by the black adhesive belt preferably has a thickness of 0.1 to 0.2 mm, and the black adhesive belt may be made of Mylar or silicon-rubber.
A width of the black adhesive belt may be preferably selected according to the type of the LED lamp 201. For example, when the LED lamp 201 is of a type 5630, the black adhesive belt may have a width of 1 to 4 mm, preferably 2 to 3 mm.
In addition, the widths of the second region 4002 and the first region 4001 on the first reflector 401 and the second reflector 402 may be adjusted according to the positions and sizes of the LED lamps 201 in the LED light bar 200, so as to achieve an optimal effect.
For example, in a further preferred embodiment, if a distance H1 between luminescent centers of the adjacent LED lamps 201 in the LED Light bar 200 is 6.9 to 9 mm and a distance H2 between the adjacent LED lamps 201 is 1 to 3.4 mm, the width W of the first region 4001 will be 2 to 3 mm.
The above are merely the preferred embodiments of the present invention. It should be noted that, a person skilled in the art may further make improvements and modifications without departing from the principle of the present invention, and these improvements and modifications shall also be considered as the scope of the present invention.
Number | Date | Country | Kind |
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2012 10 537487.8 | Dec 2012 | CN | national |