Patent Publication Number: US-9411185-B2

Title: Splicing backplane for backlight module and backlight module employing same

Description:
FIELD OF THE INVENTION 
     The invention relates to a backlight module, in particular to a splicing backplane applicable for supporting the backlight module. 
     BACKGROUND OF THE INVENTION 
     With the development of LCD technology, the production of large-size liquid-crystal-display televisions (LCD TV) and modules has become a trend. In large-size backlight modules, due to the relatively large size, backlight backplanes are hard to be subjected to one-step punch forming, so that two or more sets of moulds are usually adopted for the punch forming of a plurality of accessories to complete assembly. In addition, due to the relatively large weight of the large-size LCD modules, the splicing mode of the backplanes is particularly important and directly affects the reliability and the economy of the backplanes. 
     Therefore, it&#39;s necessary to provide a splicing backplane for a backlight module, having the advantages of simple structure, easy assembly and steady support. 
     SUMMARY OF THE INVENTION 
     In order to achieve the objective, the invention provides a splicing backplane for a backlight module, arranged on the backside of the backlight module. The splicing backplane comprises a mounting portion and a supporting portion, wherein the horizontal height of the mounting portion is level with or lower than that of the supporting portion; and a plurality of the splicing backplanes are assembled together by the mutual superposition of various mounting portions. 
     Preferably, a stepped surface is formed between the mounting portion and the supporting portion of the backplane; and the height difference of the stepped surface of one backplane between adjacent backplanes is more than that of the stepped surface of the other backplane. In addition, the height differences of the stepped surfaces between the mounting portions and the supporting portions of the adjacent backplanes are twice of each other, and the inclination angle of the stepped surfaces is between 90 and 150 degrees. Therefore, the overall thickness of the mutually superposed backplanes in pairs is invariable, and thus the smoothness can be guaranteed. 
     Preferably, for the further fixing of the mounting portions, the mounting portions are assembled together by a fastener. When the fastener is arranged on side faces of the mounting portions, end portions of the fastener are fastened onto surfaces of the mounting portions to assemble both the mounting portions together. In addition, the horizontal height of the end portions is lower than or level with that of the supporting portions. 
     Preferably, in order to reinforce the overall intensity of the splicing backplane, a plurality of reinforced edges are projected on the backplane and staggered to form a frame body so as to reinforce the intensity of two splicing backplanes. 
     Preferably, horizontal reinforcing supports and vertical reinforcing supports may be also additionally arranged on the backside of the splicing backplane and are respectively provided with a plurality of clamping grooves. By the mutual clamping of the clamping grooves and the reinforced edges of the backplane, the horizontal reinforcing supports and the vertical reinforcing supports are arranged on the backside of the backplane to further reinforce the overall intensity of the splicing backplane. In addition, the vertical reinforcing supports and the horizontal reinforcing supports are staggered and superposed with each other to form a frame body structure, symmetrically arranged in the middle of the backside of the splicing backplane, and arranged on the backplane by screws. 
     Preferably, one splicing backplane is superposed with the other splicing backplane, and the mutually superposed mounting portions of the two splicing backplanes are staggered in such a way that upper portions and lower portions of the splicing backplanes are balanced. 
     The invention also provides a backlight module, wherein the backlight modules are combined into one by the mutual superposition of splicing backplanes on the backsides of the backlight modules; the splicing backplane comprises a mounting portion and a supporting portion; the horizontal height of the mounting portion is level with or lower than that of the supporting portion; and a plurality of the splicing backplanes are assembled together by the mutual superposition of various mounting portions. Preferably, a stepped surface is formed between the mounting portion and the supporting portion of the backplane, and the height difference of the stepped surface of one backplane between adjacent backplanes is more than that of the stepped surface of the other backplane. 
     Compared with the prior art, a plurality of the splicing backplanes are superposed with each other and combined into one, and the height differences between the mounting portions and the supporting portions of two adjacent backplanes are unequal, so that one backplane can be accommodated into the other backplane; and meanwhile, after the superposition, the overall thickness of the backplanes is invariable. In addition, by adoption of the fastener to fix the two superposed backplanes together, the splicing backplane for the backlight module has the advantages of not destroying the structure of the backplanes, being convenient in assembly and disassembly, reducing the splicing difficulty and the production cost and improving the assembly efficiency and the product yield. Moreover, by the mutual superposition of a plurality of the backplanes, a large-size backplane is not required to be prepared. Furthermore, due to the splicing structure, the supporting intensity of the backplane may be also improved. Meanwhile, the horizontal reinforcing supports and the vertical reinforcing supports which are mutually staggered are additionally arranged and integrated into a whole with the backplane so as to further reinforce the overall intensity of the backplane. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an overall view of a first embodiment of a splicing backplane for a backlight module, provided by the invention; 
         FIG. 2  is a schematic view of a single backplane of the splicing backplane for the backlight module, provided by the invention; 
         FIG. 3  is an assembly drawing illustrating the state after the superposition of the backplanes of the splicing backplane for the backlight module, provided by the invention; 
         FIG. 4  is an overall view of a second embodiment of the splicing backplane for the backlight module, provided by the invention; 
         FIG. 5  is a schematic structural view of a horizontal backplane support of the splicing backplane for the backlight module, provided by the invention; and 
         FIG. 6  is a schematic structural view of a vertical backplane support of the splicing backplane for the backlight module, provided by the invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     As illustrated in  FIGS. 1 and 2 , the invention provides a splicing backplane  100  for a backlight module, which is arranged on the backside of the backlight module  200 . The splicing backplane  100  comprises a mounting portion  10  and a supporting portion  12 , wherein the horizontal height of the mounting portion  10  is level with or lower than that of the supporting portion  12 ; and a plurality of the splicing backplanes  100  are assembled together by the mutual superposition of various mounting portions  10 . 
     The splicing backplane  100 , taken as a supporting mechanism for the large-size backlight module  200 , is arranged on the backside of the backlight module  200 , formed by the mutual superposition and splicing of a plurality of sets of spliced backplanes  1 , and used for supporting the whole backlight module  200  by the extension of a plurality of sets of the spliced backplanes  1 . As such, a large-size backplane  1  is not required to be formed to support the backlight module, and the backplane formed by partitioning has the advantages of small size, easy forming, more steady combined support, uniform force exertion and incapability of being easily deformed. 
     As illustrated in  FIGS. 2 and 3 , a mutually superposed part of two adjacent backplanes  1  is taken as the mounting portion  10 , and the other part is taken as the supporting portion  12 ; a stepped surface  14  is formed between the mounting portion  10  and the supporting portion  12  of the backplane  1  and is at a right angle; and the horizontal height of the mounting portion  10  is lower than that of the supporting portion  12 , namely the height difference of the stepped surface of one backplane between the adjacent backplanes is more than that of the stepped surface of the other backplane. Supposing that the two adjacent superposed backplanes are a first backplane  1   a  and a second backplane  1   b , a first mounting portion  101  of the first backplane  1   a  is lower than a first supporting portion  121  thereof; a first stepped surface  141  is formed between the first mounting portion  101  and the first supporting portion  121  in the first backplane  1   a ; a second mounting portion  102  of the second backplane  1   b  is lower than a second supporting portion  122  thereof; and a second stepped surface  142  is formed between the second mounting portion  102  and the second supporting portion  122  in the second backplane  1   b . Moreover, when the first backplane  1   a  is superposed with the second backplane  1   b , the height difference between the first mounting portion  101  and the first supporting portion  121  of the first backplane  1   a  is more than that between the second mounting portion  102  and the second supporting portion  122  of the second backplane  1   b , namely the height difference of the first stepped surface  141  is more than that of the second stepped surface  142 , so that the second backplane  1   b  is superposed on the first stepped surface  141  of the first backplane  1   a  during the mutual superposition of the two backplanes. At this point, the first mounting portion  101  and the second mounting portion  102  are aligned and superposed with each other, and thus the first backplane  1   a  and the second backplane  1   b  are assembled together. In addition, due to the arrangement of the stepped surfaces, the overall projection of the splicing backplane cannot be caused by the mounting portions, and thus the smoothness of the whole splicing backplane  1  can be guaranteed. 
     Preferably, the height differences of the stepped surfaces  14  between the mounting portions  10  and the supporting portions  12  of the adjacent backplanes are twice of each other, so that the thickness of the splicing backplane after assembly is relatively small. Moreover, the inclination angle of the stepped surfaces is between 90 and 150 degrees. 
     For better fixing of the two backplanes together, when the adjacent backplanes are superposed with each other, a fastener  300  must be sleeved into side faces of the mounting portions to assemble the two mounting portions together. Preferably, the fastener  300  is a screw; end portions  30  at both ends of the fastener  300  extend inwards; the fastener  300  is fastened onto the second mounting portion  102  through an inner end portion  30 ; and the horizontal height of the inner end portion  30  is lower than or level with that of the supporting portion. As such, the two mounting portions are fastened and fixed together. By adoption of the fastener with the structure for assembly, the backplanes are convenient in assembly and disassembly without destroying the structure thereof. 
     In order to achieve more steady overall structure of the splicing backplane, a plurality of reinforced edges  132  are projected on the backplane  1 . The reinforced edges  132  are staggered to form a frame body so as to reinforce the intensity of the backplane. 
     As illustrated in  FIGS. 4 to 6 , in order to further reinforce the intensity of the splicing backplane, horizontal reinforcing supports  400  are additionally arranged on the backside of the splicing backplane to reinforce the intensity of the backplane in the horizontal direction, are parallel to a major axis of the splicing backplane, and are respectively provided with a plurality of clamping grooves  402 . By the mutual clamping of the clamping grooves  402  and the reinforced edges  132  of the backplane  1 , the horizontal reinforcing supports  400  are arranged on the backside of the backplane  1 . Moreover, various clamping grooves  402  are parallel to each other, are cross-shaped, and are correspondingly arranged according to the distribution spacing of the reinforced edges  132 . Furthermore, a plurality of the horizontal reinforcing supports  400  are arranged in the middle of the backside of the backplane. 
     As illustrated in  FIG. 1 , as the overall structure of the splicing backplane for the backlight module is large, the problem of center-of-gravity offset may be caused in the case of superposition on the same side. In order to achieve balanced and steady overall structure of the splicing backplane, one splicing backplane is superposed with the other splicing backplane, and the mutually superposed mounting portions of the two splicing backplanes are staggered in such a way that upper portions and lower portions of the splicing backplanes are balanced, and thus the problem of imbalance due to the problem of center-of-gravity offset can be avoided. 
     In order to further fix the whole splicing backplane, vertical reinforcing supports  500  are additionally arranged on the backside of the splicing backplane to reinforce the intensity of the backplane in the vertical direction. The vertical reinforcing supports  500  and the horizontal reinforcing supports  400  are staggered and superposed with each other to form a frame body structure. In the embodiment, the vertical reinforcing supports  500  and the horizontal reinforcing supports  400  are symmetrically arranged on the backside of the splicing backplane, wherein the vertical reinforcing supports  500  are arranged at the bottom of the horizontal reinforcing supports  400 ; each vertical reinforcing support  500  is provided with a plurality of clamping grooves  502 ; and by the mutual clamping of the clamping grooves  502  and the reinforced edges  132  of the backplane  1 , the vertical reinforcing supports  500  are arranged on the backside of the backplane  1 . In the embodiment, the number of the vertical reinforcing supports  500  is 6. The overall intensity of the splicing backplane can be further reinforced by the mutual staggering and superposition of the horizontal reinforcing supports  400  and the vertical reinforcing supports  500 . 
     During the assembly, firstly, the two splicing backplanes  1  to be assembled are mutually superposed and the two mounting portions  10  are mutually superposed; secondly, the fastener  300  is used for locking the two mounting portions together on the side faces thereof; thirdly, a plurality of the horizontal reinforcing supports  400  are arranged on the backside of the backplane  1  to reinforce the intensity of the backplane in the horizontal direction, and the vertical reinforcing supports  500  are arranged on the horizontal reinforcing supports  400 ; and fourthly, all the reinforcing supports are integrally arranged and fixed on the backplane by screws to reinforce the overall intensity of the backplane.