Patent Publication Number: US-2018046029-A1

Title: Backlight Module And Liquid Crystal Display Device

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a display field, and more particularly to a backlight module and a liquid crystal display device. 
     2. Description of Related Art 
     A liquid crystal display device has features of low radiation, thin thickness, low power consumption and so on such that the device is widely applied in desktop computers, laptops, personal digital assistants, cell phones, television, etc. Because the liquid crystal display panel cannot emit light, in order to achieve a display effect, a surface light source is required for the liquid crystal display panel for achieving the display function. For example, a backlight module, used for providing a surface light source which is evenly distributed and having a sufficient brightness. 
     The backlight module usually includes a back frame, a light source, a light guide plate and multiple optical films, the light source, the light guide plate and multiple optical films are all fixed to the back frame. In other words, the light source, the light guide plate and multiple optical films are fixed relatively through the back frame. 
     In the conventional art, the back frame is made of a plastic material. However, the anti-disturbance stiffness of the plastic material is smaller, and easily to generate bending and deformation when assembling so as to affect the assembly precision. Besides, the heat conduction performance of the plastic material is poor so that the back frame adopting the plastic material cannot effectively dissipate heat for the light source. 
     SUMMARY OF THE INVENTION 
     The technology problem mainly solved by the present invention is to provide a back frame of a backlight module and a liquid crystal display device having larger anti-disturbance stiffness and better heat conduction performance. 
     In order to solve the above technology problem, a technology solution adopted by the present invention is: a backlight module for providing a backlight source to a display panel, comprising: a back frame including a plastic frame and a reinforcement member; wherein, a stiffness of the reinforcement member is greater than a stiffness of the plastic frame; the plastic frame includes four side walls connected in an end-to-end arrangement, sequentially as a first side wall, a second side wall, a third side wall and a fourth side wall; the first side wall is adjacent to a light source of a backlight module; the reinforcement member is disposed at outside of an inner side surface of the first side wall and an outside of a bottom surface of the first side wall connected with the inner side surface such that through the reinforcement member, a heat generated by the light source is conducted to an exterior of the backlight module, and the bottom surface is a surface that is away from the display panel. 
     Wherein, the reinforcement member is further disposed at the third side wall. 
     Wherein, the reinforcement member includes two “-” shaped sub-reinforcement members respectively extended along the first side wall and the third side wall. 
     Wherein, the reinforcement member is further disposed at the second side wall and the fourth side wall. 
     Wherein, the reinforcement member includes three “-” shaped sub-reinforcement members; or one “L” shaped and one “-” shaped sub-reinforcement members; or the reinforcement member is “[” shaped. 
     Wherein, the reinforcement member is further disposed at the second side wall and the fourth side wall, and the reinforcement member includes four “-” shaped sub-reinforcement members; or the reinforcement includes two “L” shaped sub-reinforcement members; or the reinforcement member includes one “[” shaped sub-reinforcement member and one “-” shaped sub-reinforcement member; or the reinforcement member is “□” shaped matching with the plastic frame. 
     Wherein, the reinforcement member is further disposed at an outer side surface of the first side wall, wherein, the outer side surface is opposite to the inner side surface. 
     Wherein, the reinforcement member and the plastic frame are formed integrally. 
     Wherein, the reinforcement member is a metal material. 
     In order to solve above technology problem, a technology solution adopted by the present invention is: a liquid crystal display device, wherein, the liquid crystal display device includes a backlight module and a display panel which are overlapped, and the backlight module comprises: a back frame including a plastic frame and a reinforcement member; wherein, a stiffness of the reinforcement member is greater than a stiffness of the plastic frame; the plastic frame includes four side walls connected in an end-to-end arrangement, sequentially as a first side wall, a second side wall, a third side wall and a fourth side wall; the first side wall is adjacent to a light source of a backlight module; the reinforcement member is disposed at outside of an inner side surface of the first side wall and an outside of a bottom surface of the first side wall connected with the inner side surface such that through the reinforcement member, a heat generated by the light source is conducted to an exterior of the backlight module, and the bottom surface is a surface that is away from the display panel. 
     Wherein, the reinforcement member is further disposed at the third side wall. 
     Wherein, the reinforcement member includes two “-” shaped sub-reinforcement members respectively extended along the first side wall and the third side wall. 
     Wherein, the reinforcement member is further disposed at the second side wall and the fourth side wall. 
     Wherein, the reinforcement member includes three “-” shaped sub-reinforcement members; or one “L” shaped and one “-” shaped sub-reinforcement members; or the reinforcement member is “[” shaped. 
     Wherein, the reinforcement member is further disposed at the second side wall and the fourth side wall, and the reinforcement member includes four “-” shaped sub-reinforcement members; or the reinforcement includes two “L” shaped sub-reinforcement members; or the reinforcement member includes one “[” shaped sub-reinforcement member and one “-” shaped sub-reinforcement member; or the reinforcement member is “□” shaped matching with the plastic frame. 
     Wherein, the reinforcement member is further disposed at an outer side surface of the first side wall, wherein, the outer side surface is opposite to the inner side surface. 
     Wherein, the reinforcement member and the plastic frame are formed integrally. 
     Wherein, the reinforcement member is a metal material. 
     The beneficial effect of the present invention is: comparing to the conventional art, the back frame of the backlight module of the present invention includes a plastic frame and a reinforcement member. the reinforcement member is disposed at outside of an inner side surface of the first side wall and an outside of a bottom surface of the first side wall connected with the inner side surface such that through the reinforcement member, a heat generated by the light source is conducted to an exterior of the backlight module, and the backlight module has a better heat dissipation effect. At the same time, because the stiffness of the reinforcement member is greater than the stiffness of the plastic frame, the anti-disturbance stiffness of the back frame is increased so as to avoid generating bending and deformation when assembling, and the assembly precision is higher. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is schematic diagram of a liquid crystal display device of the present invention; 
         FIG. 2  is a schematic diagram of a back frame of a backlight module of the liquid crystal display device shown in  FIG. 1  of a first embodiment; 
         FIG. 3  is a cross-sectional view of the back frame along an A-A direction; 
         FIG. 4  is a schematic diagram of a back frame of a backlight module of the liquid crystal display device shown in  FIG. 1  of a second embodiment; 
         FIG. 5  is a cross-sectional view of the back frame along a B-B direction; 
         FIG. 6  is a schematic diagram of a back frame of a backlight module of the liquid crystal display device shown in  FIG. 1  of a third embodiment; 
         FIG. 7  is a schematic diagram of a back frame of a backlight module of the liquid crystal display device shown in  FIG. 1  of a fourth embodiment; 
         FIG. 8  is a schematic diagram of a back frame of a backlight module of the liquid crystal display device shown in  FIG. 1  of a fifth embodiment; 
         FIG. 9  is a schematic diagram of a back frame of a backlight module of the liquid crystal display device shown in  FIG. 1  of a sixth embodiment; 
         FIG. 10  is a schematic diagram of a back frame of a backlight module of the liquid crystal display device shown in  FIG. 1  of a seventh embodiment; 
         FIG. 11  a schematic diagram of a back frame of a backlight module of the liquid crystal display device shown in  FIG. 1  of an eighth embodiment; 
         FIG. 12  a schematic diagram of a back frame of a backlight module of the liquid crystal display device shown in  FIG. 1  of a ninth embodiment; and 
         FIG. 13  a schematic diagram of a back frame of a backlight module of the liquid crystal display device shown in  FIG. 1  of a tenth embodiment. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     With reference to  FIG. 1 , a liquid crystal display device  100  of the present invention includes a backlight module  1  and a display panel D, and the display panel D and the backlight module  1  are overlapped. 
     The backlight module  1  includes a back frame, a light source (not shown), a light guide plate (not shown) and multiple optical films (not shown). The back frame  10  is used for fixing the light source, a light guide plate and multiple optical films. 
       FIG. 2  is a schematic diagram of a back frame of a backlight module of the liquid crystal display device shown in  FIG. 1  of a first embodiment. In the present embodiment, the back frame  10  includes a plastic frame  11  and a reinforcement member  12 . The stiffness of the reinforcement member  12  is greater than the stiffness of the plastic frame  11 . A heat dissipation performance of the reinforcement member  12  is better than a heat dissipation performance of the plastic frame  11 . Preferably, the reinforcement member  12  is made of a metal material such as aluminum or stainless steel. 
     The plastic frame  11  includes four side walls connected in an end-to-end arrangement, sequentially as a first side wall  111 , a second side wall  112 , a third side wall  113  and a fourth side wall  114 . Wherein, the first side wall  111  and the third side wall  113  are parallel with each other. The second side wall  112  and the fourth side wall  114  are parallel with each other. Two terminals of the first side wall  111  and the third side wall  113  are respectively perpendicularly connected with two terminals of the second side wall  112  and the fourth side wall  113 . In the above side walls, each side wall includes four surfaces of an inner side surface  101 , a bottom surface  102 , a top surface  103  and an outer side surface  104 . Wherein, the inner side surface  101  is a surface that is faced toward an opposite side wall, and the outer side surface  104  is a surface that is away from the opposite side wall. In a same side wall, the inner side surface  101  and the outer side surface  104  are disposed oppositely. The top surface  103  is a surface adjacent to the display panel D, the bottom surface  102  is a surface that is away from the display panel, and the top surface  103  and the bottom surface  102  are disposed oppositely. 
     The light source of a backlight module usually includes a direct-light type light source and a side-light type light source. The meaning of the direct-light type light source is that the light source is disposed right below the light guide plate. The meaning of the side-light type light source is that the light source is disposed at a side surface of the light guide plate. Using the backlight module adopting the side-light type light source as an example, the light source is disposed adjacent to a side wall of the back frame. In the present embodiment, the first side wall  111  is adjacent to the light source of the backlight module. 
     In the present embodiment, the reinforcement member  12  is only disposed at the first side wall  111 . The reinforcement member  12  is extended along the first side wall  111  and is as “-” shape. Specifically refer to  FIG. 2 . with further reference to  FIG. 3 , the reinforcement member  12  is disposed at outside of the inner side surface  101  of the first side wall  111  and an outside of the bottom surface  102  connected with the inner side surface  101 . In other words, the reinforcement member  12  surrounds the inner side surface  101  and the bottom surface  102  of the first side wall  111 . Because the light source is disposed adjacent to the first side wall  111 , the reinforcement member  12  is thermally contacted with the light source, besides, the reinforcement member  12  is not only disposed at the outside of the inner side surface  101  of the first side wall  111  but also disposed at the outside of the bottom surface  102  of the first side wall  111 , the bottom surface  102  is disposed away from the display panel D, a portion of the reinforcement member  12  disposed at the outside of the bottom surface  102  is not only located at the exterior of the backlight module but also located at the exterior of the entire liquid crystal display device after assembled with the display panel D, accordingly, the reinforcement member  12  thermally contacted with the light source can conduct the heat of the light source to the exterior of the backlight module so as to effectively dissipate the heat of the light source. 
     The disposition of the reinforcement member  12  can obviously improve the heat dissipation effect of the backlight module. At the same time, because the stiffness of the reinforcement member  12  is greater than the stiffness of the plastic frame  11 , the anti-disturbance stiffness of the backlight module can be obviously increased in order to effectively avoid the bending and deformation in the assembly process such that the backlight module has a higher assembly precision. 
       FIG. 4  and  FIG. 5  show a back frame of a backlight module of the liquid crystal display device of a second embodiment. Comparing to the first embodiment, a reinforcement member  12 ′ of a back frame  10 ′ of the present embodiment is not only disposed at the outsides of the inner side surface  101  and the bottom surface  102  of the first side wall  111  but also disposed at an outside of the outer side surface  104  of the first side wall  111 . In other words, the reinforcement member  12 ′ surrounds the inner side surface  101 , the bottom surface  102  and the outer side surface  104  of the first side wall  111 . Because the heat conduction path is further expanded, the heat dissipation effect of the present embodiment is also improved comparing to the previous embodiment. 
       FIG. 6  is a schematic diagram of a back frame of a backlight module of the liquid crystal display device of a third embodiment. Comparing with the back frame of the second embodiment shown in  FIG. 4 , the reinforcement member  22  of the back frame  20  includes two sub-reinforcement members  221  and  222 . The sub-reinforcement member  221  is as “-” shape and surrounds the first side wall  111 . The sub-reinforcement member  222  is as “-” shape and surrounds the third side wall  113 . Comparing with the back frame shown in  FIG. 5 , disposing the sub-reinforcement members at the first side wall  111  and the third side wall  113  at the same time can further improve the stiffness of the back frame. 
       FIG. 7  is a schematic diagram of a back frame of a backlight module of the liquid crystal display device of a fourth embodiment. Comparing with the back frame of the third embodiment shown in  FIG. 6 , the reinforcement member  32  of the back frame  30  includes three sub-reinforcement members  321 ,  322  and  323 . The sub-reinforcement member  321  is as “-” shape and surrounds the first side wall  111 . The sub-reinforcement member  322  is as “-” shape and surrounds the second side wall  112 . The sub-reinforcement member  323  is as “-” shape and surrounds the third side wall  113 . Comparing with the back frame shown in  FIG. 6 , disposing the sub-reinforcement members at the first side wall  111 , the second side wall  112  and the third side wall  113  at the same time can further improve the stiffness of the back frame. 
     As an alternative embodiment, the three sub-reinforcement members  321 ,  322  and  323  can also respectively surround the first side wall  111 , the fourth side wall  114  and the third side wall  113 . 
       FIG. 8  is a schematic diagram of a back frame of a backlight module of the liquid crystal display device of a fifth embodiment. Comparing with the back frame of the fourth embodiment shown in  FIG. 7 , the reinforcement member  42  of the back frame  40  of the present embodiment includes two sub-reinforcement members  421  and  422 . The sub-reinforcement member  421  is as “-” shape and surrounds the first side wall  111 . The sub-reinforcement member  422  is as “L” shape and surrounds outsides of the second side wall  112  and the third wall  113 . 
     As an alternative embodiment, the “L” shaped sub-reinforcement member  422  can surrounds the outsides of the first side wall  111  and the second side wall  112  connected as “L” shape. The “-” shaped sub-reinforcement member surrounds the third side wall  113 . 
       FIG. 9  is a schematic diagram of a back frame of a backlight module of the liquid crystal display device of a sixth embodiment. Comparing with the back frame of the fifth embodiment shown in  FIG. 8 , the reinforcement member  52  of the back frame  50  is as “[” shape, and is extended to surround the outsides of the first side wall  111 , the second side wall  112  and the third side wall  113 . In an actual application, the “[” shaped reinforcement member  52  can also surround the first side wall  111 , the fourth side wall  114  and the third side wall  113 . 
       FIG. 10  is a schematic diagram of a back frame of a backlight module of the liquid crystal display device of a seventh embodiment. Comparing with the back frame of the sixth embodiment shown in  FIG. 9 , the reinforcement member  62  of the back frame  60  of the present embodiment is a “□” shape, and is extended to surround the outsides of the first side wall  111 , the second side wall  112 , the third side wall  113  and the fourth side wall  114 . Comparing the reinforcement member disposed at one side wall, two side walls and three side walls, the reinforcement member disposed at four side walls has a strongest stiffness in the back frame in the embodiments. 
       FIG. 11  a schematic diagram of a back frame of a backlight module of the liquid crystal display device of an eighth embodiment. Comparing with the back frame of the seventh embodiment shown in  FIG. 10 , the reinforcement member  72  of the back frame includes four sub-reinforcement members  721 ,  722 ,  723  and  724 . The sub-reinforcement member  721  is as “-” shape and surrounds the first side wall  111 . The sub-reinforcement member  722  is as “-” shape and surrounds the second side wall  112 . The sub-reinforcement member  723  is as “-” shape and surrounds the third side wall  113 . The sub-reinforcement member  724  is as “-” shape and surrounds the fourth side wall  114 . 
       FIG. 12  a schematic diagram of a back frame of a backlight module of the liquid crystal display device of a ninth embodiment. Comparing with the back frame of the eighth embodiment shown in  FIG. 11 , the reinforcement member  82  of the back frame  80  of the present embodiment includes two “L” shaped sub-reinforcement members  821  and  822 . The sub-reinforcement member  821  surrounds the first side wall  111  and the second side wall  112 . The sub-reinforcement member  822  is extended to surround the outsides of the third side wall  113  and the fourth side wall  114  connected as “L” shape. 
       FIG. 13  a schematic diagram of a back frame of a backlight module of the liquid crystal display device of a tenth embodiment. Comparing with the back frame of the ninth embodiment shown in  FIG. 12 , the reinforcement member  92  of the back frame  90  of the present embodiment includes two sub-reinforcement members  921  and  922 . Wherein, the sub-reinforcement member  921  is as “[” shape and is extended to surround the outsides of the fourth side wall  113 , the first side wall  111  and the second side wall  112 . The sub-reinforcement member  922  is as “-” shape and is extended to surround the outside of the third side wall  113 . In an actual application, the “[” shaped sub-reinforcement member can also surround the first side wall  111 , the second side wall  112  and the third side wall  113 . The “-” shaped sub-reinforcement member can surround the outside of the fourth side wall  114 . 
     In all embodiments described above, preferably, the reinforcement member and the plastic frame are formed integrally. In an actual application, the reinforcement member can also adopt an embedded method to fix the plastic frame relatively. 
     The beneficial effect of the present invention is: comparing to the conventional art, the back frame of the backlight module of the present invention includes a plastic frame and a reinforcement member. the reinforcement member is disposed at outside of an inner side surface of the first side wall and an outside of a bottom surface of the first side wall connected with the inner side surface such that through the reinforcement member, a heat generated by the light source is conducted to an exterior of the backlight module, and the backlight module has a better heat dissipation effect. At the same time, because the stiffness of the reinforcement member is greater than the stiffness of the plastic frame, the anti-disturbance stiffness of the back frame is increased so as to avoid generating bending and deformation when assembling, and the assembly precision is higher. 
     The above embodiments of the present invention are not used to limit the claims of this invention. Any use of the content in the specification or in the drawings of the present invention which produces equivalent structures or equivalent processes, or directly or indirectly used in other related technical fields is still covered by the claims in the present invention.