Abstract:
The present invention discloses a backlight module and LCD module, the backlight module comprises a back cover, a positioning assembly and a backlight assembly, wherein the backlight assembly is connected with the back cover by the positioning assembly, the positioning assembly comprises a positioning component located at the corner of the back cover and a bending portion provided on the back cover. By means of the bending portion on the back cover, the light guide plate and optical films can be fixed easily and expediently, especially for the assembling and reworking of module. In addition, the other parts disposed close to the light guide plate, for example LED, can be protected effectively from being crushed because of the expansion of light guide plate.

Description:
TECHNICAL FIELD OF THE INVENTION 
       [0001]    The present invention relates to the manufacturing technology of liquid crystal displays, and more particularly to a backlight module and LCD module. 
       BACKGROUND OF THE INVENTION 
       [0002]    The statements in this section merely provide background information related to the present invention and may or may not constitute prior art. 
         [0003]    LCD (liquid crystal display) TV, PC, Monitors, display devices are widely used. In general, a LCD module comprises three main assemblies, i.e. a backlight module, a LCD panel and a front frame. The backlight module comprises a back cover, a positioning assembly and a backlight assembly. The backlight assembly may comprise reflecting sheet, a light guiding plate and optical membranes. The reflecting sheet, the light guiding plate and the optical membranes (optical films) are fixed by four positioning components located at the four corner of the back cover respectively. As shown in  FIG. 1 , the end portions of the positioning components  104  are provided with a hook  101 . By means of the hook  101  the positioning components  104  is connected to the back cover  108 . Furthermore, the light guiding plate  106  is positioned by the stepping portions of the positioning components  104 . And the positioning components  104  are provided with pins  105  and the optical membranes  103  are provided with holes. The pins  105  penetrate through the holes on the optical membranes  103  so as to guarantee the mechanical strength of the optical membranes  103 . In this way, the optical membranes  103  are fixed on by the positioning components  104  securely. Since the light guiding plate  106  may expand when it is heated, the positioning components  104  is usually formed of elastic material such as rubber. However, the light guiding plate  106  may expand and exert pressure on other parts (such as the light bar of the backlight module). There is a risk that the other parts will be compressed and damaged by the light guiding plate. 
       SUMMARY OF THE INVENTION 
       [0004]    The present invention provides a backlight module to solve the mentioned problem above. 
         [0005]    The present invention is realized in such a way that: a backlight module, which comprises a back cover, a positioning assembly and a backlight assembly, wherein the backlight assembly is connected with the back cover by the positioning assembly, the positioning assembly comprises a positioning component located at the corner of the back cover and a bending portion provided on the back cover, the positioning component is adhered onto the back cover. 
         [0006]    According to an embodiment disclosed herein, the bending portion is formed on the side wall of the back cover in an integral manner and extends inwards. 
         [0007]    According to another embodiment disclosed herein, the bending portion comprises a first bending section extending inwards and a second bending section extending upwards from the first bending section, the second bending section penetrates through the positioning component. 
         [0008]    According to another embodiment disclosed herein, the backlight assembly comprises a reflecting sheet, a light guiding plate and optical membranes, the reflecting sheet, the light guiding plate and the optical membranes are overlapped on the positioning component. 
         [0009]    According to another embodiment disclosed herein, the optical membranes are provided with through holes, the second bending section penetrates through the through holes. 
         [0010]    According to another embodiment disclosed herein, the positioning assembly further comprises an additional bending portion, the additional bending portion is formed on the side wall of the back cover in an integral manner, the additional bending portion extends inwards and then upwards, the additional bending portion is located at the same side with the light source of the backlight module, so as to prevent the light source from being pressed by the expansion of light guide plate. 
         [0011]    According to another embodiment disclosed herein, the additional bending portion and the bending portion are located at the different sides of the back cover; the additional bending portion and the bending portion have the same shape. 
         [0012]    According to another aspect of the present invention, a LCD module is also provided, which comprises a backlight module, a LCD panel and a front frame, the backlight module is connected with the front frame, the backlight module comprises a back cover, a positioning assembly and a backlight assembly, wherein the backlight assembly is connected with the back cover by the positioning assembly, the positioning assembly comprises a positioning component located at the corner of the back cover and a bending portion provided on the back cover, the positioning component is adhered onto the back cover. 
         [0013]    According to another embodiment disclosed herein, the LCD module further comprises a plastic frame between the backlight module and the front frame, the LCD panel is received between the front frame and the plastic frame. 
         [0014]    According to another embodiment disclosed herein, the bending portion is formed on the side wall of the back cover in an integral manner and extends inwards. 
         [0015]    According to another embodiment disclosed herein, the bending portion comprises a first bending section extending inwards and a second bending section extending upwards from the first bending section, the second bending section penetrates through the positioning component. 
         [0016]    According to another embodiment disclosed herein, the backlight assembly comprises a reflecting sheet, a light guiding plate and optical membranes, the reflecting sheet, the light guiding plate and optical membranes are overlapped on the positioning component. 
         [0017]    According to another embodiment disclosed herein, the optical membranes are provided with through holes, the second bending section penetrates through the through holes. 
         [0018]    According to yet another embodiment disclosed herein, the positioning assembly further comprises an additional bending portion, the additional bending portion is formed on the side wall of the back cover in an integral manner, the additional bending portion extends inwards and then upwards, the additional bending portion is located at the same side with the light source of the LCD module, so as to prevent the light source from being pressed by the expansion of light guide plate. 
         [0019]    According to another embodiment disclosed herein, the additional bending portion and the bending portion are located at the different sides of the back cover; the additional bending portion and the bending portion have the same shape. 
         [0020]    According to the present invention, a backlight module comprises a back cover, a positioning assembly and a backlight assembly, wherein the backlight assembly is connected with the back cover by the positioning assembly, the positioning assembly comprises a positioning component located at the corner of the back cover and a bending portion provided on the back cover, the positioning component is adhered onto the back cover. By means of the bending portion on the back cover, the light guide plate and optical films can be fixed easily and expediently, especially for the assembling and reworking of module. In addition, the other parts disposed close to the light guide plate, for example LED, can be protected effectively from being crushed because of the expansion of light guide plate. 
         [0021]    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. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0022]    The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. 
           [0023]      FIG. 1  is a schematic sectional view of traditional backlight module; 
           [0024]      FIG. 2  is a schematic exploded view of the backlight module according to an embodiment of the present invention; 
           [0025]      FIG. 3  is a schematic view of the backlight module of  FIG. 2  in assembled state; 
           [0026]      FIG. 4  is a schematic sectional view of the backlight module in  FIG. 3 ; 
           [0027]      FIG. 5  is a schematic view of the bending portion of the backlight module in  FIG. 3 ; 
           [0028]      FIG. 6  is a schematic exploded view of the backlight module according to another embodiment of the present invention; and 
           [0029]      FIG. 7  is a schematic view of the backlight module of  FIG. 6  in assembled state. 
       
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
       [0030]    The following detailed 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. Directional terms mentioned in the present invention, such as “upwards”, “inwards”, “front”, “rear”, “left”, “right”, “up”, “down”, “inside”, “outside”, “side” etc., are only used with reference to the orientation of the accompanying drawings. Therefore, the used directional terms are intended to illustrate, but not to limit, the present invention. Also the following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or uses. 
         [0031]    The backlight module comprises a back cover  205 , a positioning assembly and a backlight assembly. As shown in  FIG. 2  through  FIG. 4 , the backlight assembly is connected with the back cover  205  by the positioning assembly. The positioning assembly comprises a positioning component  204  located at the corner of the back cover  205  and a bending portion  206  provided on the back cover  205 . Although there is only a positioning component  204  shown in figures, there may be two or more positioning components  204  at the corners. The positioning component(s)  204  is used to connect the backlight assembly to the back cover  205 . 
         [0032]    It is should be noted that the positioning component  204  is adhered onto the back cover  205  by adhesive tapes. For example, the positioning component  204  is fixed to the bottom surface of the back cover  205  by double faced adhesive tapes. Compared with the traditional backlight module, the positioning component  204  has no hook and thus does not penetrate through the back cover  205 . Therefore, the backlight module in the present invention is more beautiful and easier to assemble. 
         [0033]    As shown in  FIG. 5 , the bending portion  206  is formed on the side wall  2051  of the back cover  205  in an integral manner and extends inwards. Since the bending portion  206  is formed on the side wall  2051  of the back cover  205  integrally, the mechanical strength of bending portion  206  is high. In particular, the bending portion  206  comprises a first bending section  2061  extending inwards and a second bending section  2062  extending upwards from the first bending section  2061 . The bending portion  206  may be formed by punching the side wall  2051  of the back cover  205 . As shown in  FIG. 5 , the bending portion  206  is joined with the back cover  205  at the joining portion  2060 . The second bending section  2062  penetrates through the positioning component  204 . The positioning component  204  is provided with a suspending hole, the second bending section  2062  is inserted into the second bending section  2062 . In this way, the positioning component  204  is positioned by the bending portion  206 . 
         [0034]    As shown in  FIG. 2  and  FIG. 4 , the backlight assembly comprises a reflecting sheet  203 , a light guiding plate  202  and optical membranes  201 , the reflecting sheet  203 . The light guiding plate  202  and the optical membranes  201  are overlapped on the positioning component  204 . The optical membranes  201  have three layers in this embodiment. The optical membranes  201  are above the light guiding plate  202  and the reflecting sheet  203 . The light guiding plate  202  is above the reflecting sheet  203 . The light guiding plate  202  is located between the optical membranes  201  and the reflecting sheet  203 . The light guiding plate  202  and the reflecting sheet  203  is supported on the stepping portion of the positioning component  204 . As described above, the second bending section  2062  penetrates through the positioning component  204 . Moreover, the optical membranes  201  are provided with through holes  207 , the second bending section  2062  penetrates through the through holes  207 . In other words, the second bending section  2062  firstly penetrates through the positioning component  204 , and then penetrates through the optical membranes  201  upwards. The free end of the second bending section  2062  is higher than the optical membranes  201  in the figure. The free end of the second bending section  2062  is higher than the light source (such as LED light bar). Also, the mechanical strength of bending portion  206  is high. There is no need to worry that the light guiding plate  202  expands and exerts pressure on other parts (such as the light source of the backlight module). 
         [0035]    In this way, the light guiding plate  202  and the optical membranes  201  are positioned by the positioning component  204  and the bending portion  206 . Also, the free end of the second bending section is higher than the optical membranes  201  and the light source (such as LED light bar) in vertical direction. The positioning component  204  and the optical membranes  201  can be fixed securely by the second bending section  2062  of the bending portion  206 . Additionally, the mechanical strength of bending portion  206  is high. Accordingly, there is no need to worry that the light guiding plate  202  expands and exerts pressure on other parts (such as the light source of the backlight module). 
         [0036]    A modified embodiment will be described with reference to  FIG. 6  and  FIG. 7 . The positioning assembly further comprises an additional bending portion  306  compared with the embodiment in  FIG. 1 . The additional bending portion  306  is formed on the side wall of the back cover  205  in an integral manner. The additional bending portion  306  also extends inwards and then upwards. The additional bending portion  306  is located at the same side with the light source  400  of the backlight module, so as to prevent the light source from being pressed by the expansion of light guide plate  400 . In this embodiment, the light source  400  is a LED light bar. The additional bending portion  306  and the bending portion  206  are located at the different sides of the back cover  205  as shown in  FIG. 6  and  FIG. 7 . The additional bending portion  306  and the bending portion  206  have the same shape. The additional bending portion  306  and the bending portion  206  can be formed in one punching at the same time. 
         [0037]    Although only one additional bending portion  306  and only one bending portion  206  are shown in figures, there can be two or more additional bending portion and bending portion. 
         [0038]    As shown in  FIG. 7 , the additional bending portion  306  is located at the inside of the positioning component  204 . The additional bending portion  306  is located at the outside of the light guiding plate  202 . In other words, the additional bending portion  306  is located between the positioning component  204  and the light guiding plate  202 . In this way, the additional bending portion  306  can resist the expansion movement of the light guiding plate  202 . Accordingly, there is no need to worry that the light guiding plate  202  expands and exerts pressure on the light source  400 . 
         [0039]    According to another aspect of the present invention, a LCD module is provided. The LCD module comprises the backlight module described above, a LCD panel  210  and a front frame  208 . The backlight module is connected with the front frame  208 . The backlight module comprises a back cover  205 , a positioning assembly and a backlight assembly. As described above, the backlight assembly is connected with the back cover  205  by the positioning assembly. The positioning assembly comprises a positioning component  204  located at the corner of the back cover  205  and a bending portion  206  provided on the back cover  205 , the positioning component  204  is adhered onto the back cover  205 . The LCD module further comprises a plastic frame  209  between the backlight module and the front frame  208 , the LCD panel  210  is received between the front frame  208  and the plastic frame  209 . 
         [0040]    While the present invention has been described with reference to certain embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the present invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the present invention without departing from its scope. Therefore, it is intended that the present invention not be limited to the 3 particular embodiment disclosed, but that the present invention will include all embodiments falling within the scope of the appended claims.