Abstract:
A back plate assembly with variable curvatures is disclosed. It comprises a flexible back plate, a connecting component, and an adjustment mechanism, and the adjustment mechanism comprises a connecting shaft disposed on the back plate, and the connecting component connects to the connecting shaft and abuts to the back plate, and the adjustment mechanism adjusts the connecting component on the connecting shaft to modulate clamping force of the back plate received from the connecting component. The back plate assembly can adapt to the backlight units and the display devices with different curvatures based on the requirement of the bend degree. Many kind of the back plate assemblies do not need to be manufactured to fit the backlight unit and the display device having different curvatures.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to the display field; in particular, to a backlight assembly and a backlight unit thereof. 
         [0003]    2. Description of the Prior Art 
         [0004]    With the development of the display technology, major electronic display device and display panel manufacturers gradually purse the curved display technology. The display equipment employs the curved display penal that enable the distance between the whole panel and the viewer&#39;s eye to be the same to insure the clarity of the viewer watching the images on the two sides of the panel. At the same time, the viewer easily has an immersive experience when they watch the curved display equipment. 
         [0005]    A Nowadays, the two methods of the curved module achieving curved surface of the panel is that one is to use a frame to bend the back plate to form the target curve and then to fix the backlight module; the other one is to form the curved structure of the back plate and then to fix the backlight module. However, the two structures of the back plate cannot achieve the modulation of the curvature of the curved module, only for one single curvature. 
       SUMMARY OF THE INVENTION 
       [0006]    In light of the shortcoming in the conventional art, the present invention provides a backlight assembly with variable curvatures and a backlight unit thereof. In order to achieve the purpose, the present invention adopts the following technical solution: 
         [0007]    A back plate assembly with variable curvatures, comprising a flexible back plate, a connecting component, and an adjustment mechanism, and the adjustment mechanism comprises a connecting shaft disposed on the back plate, and the connecting component connects to the connecting shaft and abuts to the back plate, and the adjustment mechanism adjusts the connecting component on the connecting shaft to modulate clamping force of the back plate received from the connecting component. 
         [0008]    Further, the middle portion of the connecting component connects to the connecting shaft and two ends of the connecting component abuts to back side of the back plate, and the adjustment mechanism adjusts position where the middle portion of the connecting component is located on the connecting shaft. 
         [0009]    Further, the connecting component comprises two connecting arms, a fixing plate, two moving plates and a moving block, and the fixing plate is set on the connecting shaft to fix on back side of the back plate; the two moving plates are respectively hinged with two opposite side faces of the fixing plate; the moving block is set on the connecting shaft and moves along an axial of the moving plates; one end of the connecting arm is hinged with the moving block and another end of the connecting arm is hinged with the movable plate. 
         [0010]    Further, the connecting component comprises two connecting arms and a moving block, and the movable block is set on the connecting shaft and moves along an axial of the moving plates; one end of the connecting arm fixes to the movable block relatively and two of the connecting arms have a certain included angle. 
         [0011]    Further, the connecting component further comprises two moving plates, and the two moving plates respectively is fixed slidably to back side of the back plate, and another ends of two of the connecting arms are hinged with the moving plate. 
         [0012]    Further, a plurality of elongated slide holes are disposed on the moving plate, and limiting nails penetrate through the elongated slide holes to fix on the back plate, and the moving plate slides relatively to the limiting nails. 
         [0013]    Further, one end of the connecting shaft is attached rotatably to the back plate, and another end of the connecting shaft is attached to a thread of the moving block, and the adjustment mechanism further comprises a driven module connecting to the connecting shaft, and the driven module powers the connecting shaft turning to move the moving block along an axial of the connecting shaft. 
         [0014]    Further, the driven mechanism comprises a driving gear, and a driven gear is disposed on the connecting shaft, and the driven mechanism drives the driven gear rotating. 
         [0015]    A backlight unit, comprising a backlight module and a back plate assembly with variable curvatures, the back plate assembly comprises a flexible back plate, a connecting component, and an adjustment mechanism, and the adjustment mechanism comprises a connecting shaft disposed on the back plate, and the connecting component connects to the connecting shaft and abuts to the back plate, and the adjustment mechanism adjusts the connecting component on the connecting shaft to modulate clamping force of the back plate received from the connecting component. 
         [0016]    Further, the middle portion of the connecting component connects to the connecting shaft and two ends of the connecting component abuts to back side of the back plate, and the adjustment mechanism adjusts position where the middle portion of the connecting component is located on the connecting shaft. 
         [0017]    Further, the connecting component comprises two connecting arms, a fixing plate, two moving plates and a moving block, and the fixing plate is set on the connecting shaft to fix on back side of the back plate; the two moving plates are respectively hinged with two opposite side faces of the fixing plate; the moving block is set on the connecting shaft and moves along an axial of the moving plates; one end of the connecting arm is hinged with the moving block and another end of the connecting arm is hinged with the movable plate. 
         [0018]    Further, the connecting component comprises two connecting arms and a moving block, and the movable block is set on the connecting shaft and moves along an axial of the moving plates; one end of the connecting arm fixes to the movable block relatively and two of the connecting arms have a certain included angle. 
         [0019]    Further, the connecting component further comprises two moving plates, and the two moving plates respectively is fixed slidably to back side of the back plate, and another ends of two of the connecting arms are hinged with the moving plate. 
         [0020]    Further, a plurality of elongated slide holes are disposed on the moving plate, and limiting nails penetrate through the elongated slide holes to fix on the back plate, and the moving plate slides relatively to the limiting nails. 
         [0021]    Further, one end of the connecting shaft is attached rotatably to the back plate and another end of the connecting shaft is attached to a thread of the moving block, and the adjustment mechanism further comprises a driven module connecting to the connecting shaft, and the driven module powers the connecting shaft turning to move the moving block along an axial of the connecting shaft. 
         [0022]    Further, the driven mechanism comprises a driving gear, and a driven gear is disposed on the connecting shaft, and the driven mechanism drives the driven gear rotating. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0023]      FIG. 1  is the schematic diagram of the flat state back plate of the back plate assembly of the first embodiment of the present invention. 
           [0024]      FIG. 2  is the schematic diagram of  FIG. 1  in the main view direction 
           [0025]      FIG. 3  is the schematic diagram of the curved state back plate of the back plate assembly of the first embodiment of the present invention. 
           [0026]      FIG. 4  is the schematic diagram of  FIG. 3  in the main view direction 
           [0027]      FIG. 5  is the schematic diagram of the curved state back plate of the back plate assembly of the second embodiment of the present invention. 
           [0028]      FIG. 6  is the schematic diagram of  FIG. 5  in the main view direction 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0029]    In order to understand the present invention well, the following examples combining with the accompanying drawings in detail. 
       1st Embodiment 
       [0030]    Please refer to  FIG. 1 . The embodiment of the present invention provides a back plate with variable curvatures used to fix a backlight module having a light guide structure such as a light guide plate and an optical film. It comprises a flexible back plate  10 , a connecting component  20  and an adjustment mechanism  30 . The adjustment mechanism  30  comprises a connecting shaft  301  disposed on the back plate  10 , and the middle portion of the connecting component  20  attaches to the connecting shaft  301 , and the two ends of the connecting component  20  abuts to the back side of the back plate  10 . The adjustment mechanism  30  adjusts the position on the connecting shaft  301  and in the medium of the connecting component  20  to control the clamping force of the two ends of the connecting component  20  and to change the bending degree of the back plate  10 . 
         [0031]    Specifically, the connecting component  20  comprises two connecting arms  201 , a fixing plate  202 , two moving plates  203  and a moving block  204 . The fixing plate  202  is set on the connecting shaft  301  and fixed on the back side of the connecting shaft  301 . The fixing plate  202  is disposed on the back plate  10  by two fixing screws. The two moving plates  203  can be respectively hinged with two opposite side faces of the fixing plate  202  to fix the two moving plates  203  to the sides of the fixing plate  202  slidably. The moving block  204  is set on the connecting shaft  301  and moves along an axial of the moving plates. One end of each of the connecting arms  201  is hinged to the moving block  204 , and the other end is hinged to the moving plate  203 . 
         [0032]    A pin is used to connect slidably between the two moving plates  203  and the fixing plate  203 , between the moving plates  203  and the two connecting arms  201 , and between the two connecting arms  201  and the moving block  204 . The connecting structure is simple and reliable. Specifically, the moving block  204  comprises grooves  204   a  and a central hole (not shown in figures).One end of the connecting arm  201  embeds into the groove  204   a  and then the shaft is positioned by the pin. The connecting arm  201  can be rotated relatively to the moving block  204  and the central hole of the moving block  204  is used to be penetrated by the connecting shaft  301 . Similarly, the other groove (not shown in figures) is disposed on the moving plate  203  connecting to the connecting arm  201  rotatably. The other end of the connecting arm  201  is embedded into the other notch and then the shaft is positioned by the pin. 
         [0033]    As shown in  FIG. 2 ,  FIG. 3 , and  FIG. 4 , one end of the connecting shaft  301  is rotatable connected to the back plate  10 , and the other end of the connecting shaft  301  is connected to the thread of the moving block  204 , i.e. the central hole of the moving block  204  has an inner thread. The adjustment mechanism  30  further comprises a driven mechanism  302  connecting to the connecting shaft  301 . The driven mechanism  302  is used for rotating the driven mechanism  301  to move the moving block  204  along the axial direction of the connecting shaft  301 . Specifically, the connecting shaft  301  is positioned on the back plate  10  by the connecting component  301   a  to make the connecting shaft  301  rotate on the back plate  10  without escaping. 
         [0034]    The driven mechanism  302  of the first embodiment employs a gear to rotate and the driven mechanism  302  drives by the gear hereto. The connecting shaft  301  connects with a driven gear  3011 . The power source of the driven mechanism  302  is the rotation of the driven gear  3011 . 
         [0035]    It can be understood that the driven mechanism  302  of the first embodiment can be other driven mechanism, such as a belt transmission structure, a worm and gear structure and so on 
         [0036]    In practice, when to change the shape of the back plate demands the specific curvature, the driven mechanism  302  drives the connecting shaft  301  relatively to the back plate  10  such that the moving block  204  moves toward the back plate  10 . Because the fixing plate  202  does not move around, the moving block  204  drives the connecting arm  201  and the two sides of the moving plate  203  rotating, and then the included angles between the connecting arm  201  and the back plate  10  and between the moving plate  203  and the back plate  10  gradually decrease to press the two side of the back plate  10  and bend the back plate with the specific curvature. When the flat shape of the back plate is demanded, the driven mechanism  302  drives the connecting shaft  301  rotating with the opposite direction. The pressure of the back plate from the connecting arm  201  and two sides of the moving plate  203  gradually decreases until it return to the flat shape. 
         [0037]    The backlight unit of the present invention comprises a backlight module and a back plate assembly. Because the back plate assembly requires the curvature modulation according to the backlight module, it solves a problem that one single back plate cannot adapt to many kinds of the backlight unit in the manufacture process, and it reduces the amount of the share part and the manufacture cost. 
       2nd Embodiment 
       [0038]    As shown in  FIG. 5  and  FIG. 6 , the difference from the first embodiment is that the connecting component  20  of the back plate assembly of the second embodiment comprises two connecting arms  201  and moving block  204 , where the moving block  204  is set on the connecting shaft  301  and moves along the axial direction of the connecting shaft  301 . One end of the connecting arms  201  is fixed relatively to the moving block  204 , and the two connecting arms  201  have a fixed included angle. The end of the connecting shaft  301  is rotatable attached to the back plate  10 , and the other end of the connecting shaft  301  is connected to the thread of the moving block  204 . The moving block  204  moves on the connecting shaft  301  and drives the two connecting arms  201  to press the back plate  10  to form distortion. Further, the connecting component  20  of the present embodiment further comprises two moving plates  203  and the two moving plates  203  are respectively and slid ably fixed on the back side of the back plate and at the same time are hinged to the other end of the two connecting arm  201  respectively; the moving block  204  moves on the connecting shaft  301  and at the same time drives the two moving plates  203  by the two connecting arms  201  to press the back plate  10  to form distortion. The back plate  10  is pressed more uniformly to form the curvature more smoothly. In the first embodiment, the connecting arm  201  is attached with the moving block  204  by the screw to ensure that the included angle between the two connecting arms  201  is constant. It can be understood that the two connecting arm  201  and the moving block  204  can be formed in one piece as well. 
         [0039]    Specifically, a plurality of elongated slide holes  2030  are disposed on the moving plate  203 , and limiting nails  400  penetrate through the slide holes  2030  to fix on the back plate  10 . The moving plate  203  slides relatively to the limiting nails. Specifically, the limiting nails  400  are screws comprising nuts (not shown in figures) and threaded ends (not shown in figures). The limiting nails  400  penetrates through the elongated slide holes  2030  on the moving plate  203  and the threaded ends is fixed on the back plate  10 . The moving plate  203  is positioned by the nuts to prevent the moving plate  203  on escaping. The slide holes  2030  of the moving plate  203  slide along the limiting nails  400 . It can be understood that the amount of the slide holes  2030  and the amount of the limiting nails  400  are designed based on the practical requirement for leading the moving plate  203  to slide relatively to the back plate  10  without escaping in the second embodiment. 
         [0040]    In practice, when to change the shape of the back plate demands the specific curvature, the driven mechanism  302  drives the connecting shaft  301  relatively to the back plate  10  such that the moving block  204  moves toward the back plate  10 . Because the two connecting arms  201  is attached to the moving block  204  relatively, the two connecting arms  201  moves with the moving block  204  toward the back plate  10  such that they drives the moving plate  204  to press the back plate  10 . During the process of pressing the back plate, the curvature of the back plate  10  becomes large and the limit nail  400  slides toward the slide holes  2030  and closely to the end of the connecting shaft  301  such that the two sides of the back plate  10  is pressed to bend the back plate  10  with the specific curvature. When the flat shape of the back plate  10  is demanded, the driven mechanism  302  drives the connecting shaft  301  rotating with the opposite direction. The pressure of the back plate  10  from the connecting arm  201  and two sides of the moving plate  203  gradually decreases until it return to the flat shape. 
         [0041]    The above are only specific embodiments of the present invention, it should be noted that those of ordinary skill in the art, in the present invention without departing from the principles of the premise, further improvements and modifications may be made, these improvements and modifications should also be regarded as the protection scope of the present invention.