Abstract:
A backlight module has a light guide plate and a frame, wherein the light guide plate includes at least a bump or at least a breach, and at least a pin is arranged on the frame, so as to the bump or the breach may be engaged with the pin. The pin on the frame not only fixes and positions the light guide plate but also prevents the light guide plate from leaking light and enhances the structure strength.

Description:
BACKGROUND 
     1. Field of the Invention 
     The present invention generally relates to a backlight module, and more especially, to an orientation structure of light guide plate (LGP). 
     2. Description of the Prior Art 
     With the progress of science and technology, because the superiority of the liquid crystal display is light, thin, and low power consumption, the application of the liquid crystal display expands rapidly. Owing to the liquid crystal display is not a radiation device, the backlight module plays a great role in liquid crystal display. Wherein, generally speaking, the orientation of light guide plate can be achieved by utilizing the plastic frame or a plank which is backplate-stamping. The advantage of utilizing the plastic frame is the shape of the frame can be varied by mold. But the light guide plate must be assembled reversely if the plastic frame is used to position the light guide plate. The drawback of the type is it may cost a long time to fabricate and the accuracy of the assembly is low. Besides, refer to  FIG. 1 ,  FIG. 1  is a schematic top view of the architecture of the backlight module  100 ′ in accordance with the prior art, stamping plank  410 ′ punched from back plate  400 ′ is utilized to position the light guide plate  300 ′, the structure of the type is strong enough but the light easily leaked out from corner  330 ′ of the protrusion  320 ′ of the light guide plate  300 ′. A modified method is to make an arc between the light guide plate and protrusion. However, the contact area of the protrusion and back plate may be decreased when the radius of the arc increases, so as to the protrusion is easy to be broken. So it is an important issue to enlarge the size of the protrusion without changing the contact area between light guide plate and back plate and to prevent the light guide plate from leaking light. 
     Hence, the main spirit of the present invention is to provide a backlight module, and then some disadvantages of well-known technology are overcome. 
     SUMMARY OF THE INVENTION 
     In order to solve the problems mentioned above, the present invention provides an orientation structure of the light guide plate applied to backlight module. 
     The leaking light issue on the light guide plate is resolved by providing a blocker structure applied to backlight module. The pins on the back plate and the breaches of the light guide plate engaged with each other, so as to increase the contact area and enhance the accuracy of assembly. 
     A plurality of pins is applied to the backlight module to make the frame and the back plate assemble together. The pins are capable of fixing and positioning the light guide plate, so as to enhance the assembly structure and provide the backlight module with supporting. 
     Accordingly, a backlight module according to an embodiment of the present invention includes a light guide plate and a frame. A light guide plate has at least a first side and at least a second side and a chamfer formed between the border of the first side and the second side. A frame has at least a pin partially surrounds in the first side and the second side. And the chamfer of the light guide plate and the pin on the frame are engaged with each other closely. 
     Other advantages of the present invention will become apparent from the following description taken in conjunction with the accompanying drawings wherein are set forth, by way of illustration and example, certain embodiments of the present invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The foregoing aspects and many of the accompanying advantages of this invention will become more readily appreciated as the same becomes better understood by reference to the following detailed description, when taken in conjunction with the accompanying drawings, wherein: 
         FIG. 1  is a schematic top view of the architecture of the backlight module, in accordance with the prior art; 
         FIG. 2  is a three-dimensional view of the architecture of backlight plate of an embodiment, in accordance with the present invention; 
         FIG. 3  is a three-dimensional view of the architecture of backlight plate of an embodiment, in accordance with the present invention; and 
         FIG. 4  is three-dimensional view of the architecture of backlight plate of an embodiment, in accordance with the present invention. 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring to  FIG. 2  is a schematic three-dimensional view of the backlight module  100  of an embodiment in accordance with the present invention. Shown in  FIG. 2 , the backlight module  100  includes a light guide plate  300  and a relative frame  400 . Wherein, the light guide plate  300  has at least a first side  310  and a second side  311 , and a chamfer  330 , for example an arc chamfer, is formed between the first side  310  and the second side  311 , in one embodiment, the second side  311  and the chamfer  330  cooperate to define a bump  320  protruded from the first side  310 . Moreover, a frame  400 , for example a back plate, having at least a pin  410  surrounds at least the first side  310  and the second side  311  of the light guide plate  300 , wherein the pin  410  may be a cylinder or an elliptic cylinder for instance. In one embodiment, the number of the pin  410  and the chamfer  330  are match, furthermore, the shape of the pin  410  is match to the shape of the chamfer  330  so as to make the pin  410  and the chamfer  330  engaged with each other closely when the light guide plate  300  is placed above the frame  400 . Such the structure can increase the contact area between light guide plate  300  and the pin  410  on the frame  400 , provide a supporting, and prevent the light guide plate  300  from leaking light. In one embodiment, the pin  410  fixed on the frame  400  by utilizing rivet or weld, and the pin  410 , not limited to, may be a screw element, for example the screw or the column made by metal materials or even the other materials enabling to be manufactured and all should not limit the scope of the invention. Moreover, the pin  410  may be applied to screw and fix the plastic frame (not shown) and frame  402  in order to enhance the structure strength. 
     Besides,  FIG. 3  is a schematic three-dimensional view of the backlight module  102  of an embodiment in accordance with the present invention. Such as shown in the  FIG. 3 , the backlight module  102  includes a light guide plate  302  and a frame  402 . Wherein, the light guide plate  302  has at least a first side  312  and a second side  313 , and a chamfer  332 , for example an arc chamfer, is formed between the first side  312  and the second side  313 , in one embodiment, the second side  313  and the chamfer  332  cooperate to define a breach  340  concaved from the first side  312 . In one embodiment, the breach  340  may be arranged symmetrically in the first side  312 . Then a frame  402 , for example a back plate, having at least a pin  412 , may be any one of cylinder and elliptic cylinder for instance, surrounds at least the first side  312  and the second side  313  of the light guide plate  302 . In one embodiment, the number of the pin  412  and the chamfer  332  are match, furthermore, the shape of the pin  412  is match to the shape of the chamfer  332  so as to make the pin  412  and the chamfer  332  engaged closely when the light guide plate  302  is placed above the frame  402 . Such the structure can increase the contact area between light guide plate  302  and the pin  412  on the frame  402 , provide a supporting, and prevent the light guide plate from leaking light. In one embodiment, the pin  412  fixed on the frame  402  by utilizing rivet or weld, and the pin  412 , not limited to, may be screw element, for example the screw or the column made by metal materials or even the other materials enabling to be manufactured and all should not limit the scope of the invention. Moreover, the pin  412  may be applied to screw and fix the plastic frame (not shown) and frame  402  in order to enhance the structure strength. 
     Moreover,  FIG. 4  is a schematically three-dimensional view of an embodiment of the present invention, the elaboration is as follows. Refer to the  FIG. 4 , in the embodiment, the light guide plate  304  has at least a chamfer  334 , for example an arc chamfer, in at least a side  314 . In one embodiment, the chamfer  334  may be arranged symmetrically in the side  314 . Furthermore, referring to  FIG. 4  again, in the embodiment, a frame  404 , for example a back plate, having at least a pin  414 , may be any one of cylinder and elliptic cylinder for instance, surrounds the light guide plate  304 . In one embodiment, the number of the pin  414  and the chamfer  334  are match, furthermore, the shape of the pin  414  is match to the shape of the chamfer  334  so as to make the pin  414  and the chamfer  334  engaged with each other closely when the light guide plate  304  is placed above the frame  404 . Such the structure can increase the contact area between light guide plate  304  and the pin  414  on the frame  404 , provide a supporting, and prevent the back light module from leaking light, such as shown in the  FIG. 4-3 . In one embodiment, the pin  414  fixed on the frame  404  by utilizing rivet or weld, and the pin  414 , not limited to, may be screw element, for example the screw or the column made by metal materials or even the other materials enabling to be manufactured and all should not limit the scope of the invention. Moreover, the pin  414  may be applied to screw and fix the plastic frame (not shown) and frame  404  in order to enhance the structure strength. 
     Accordingly, one of features is to provide pins to keep the contact area of the light guide plate with pins on back plate be plane, so as to prevent light guide plate from leaking light. Another feature is the arc of arc chamfer of the light guide plate may vary up, just utilizes the corresponding pins to fit the arc chamfer. Furthermore, the pins can provide the support to enhance the assembly strength. 
     Although the present invention has been explained in relation to its preferred embodiment, it is to be understood that other modifications and variation can be made without departing the spirit and scope of the invention as hereafter claimed.