Light Guide Plate and Fabrication Method Thereof, Extrusion Equipment, Backlight Module and Display Device

Abstract

The present invention discloses a light guide plate (LGP) capable of bidirectional focusing via a bidirectional micro-transmissive layer, a fabrication method of the LGP, an extrusion equipment, a backlight module and a display device. The LGP comprises a LGP substrate, the LGP substrate comprises at least one incident surface for receiving a light beam and one outgoing surface connected to the at least one incident surface, a bidirectional micro-transmissive layer is provided in the LGP substrate, the bidirectional micro-transmissive layer comprises a plurality of micro-transmissive points having biconvex surfaces. According to the principle that convex lens converges light, the design of micro-transmissive points having biconvex surfaces causes several scattered light beams having different directions that enter the micro-transmissive points to be converged, which effectively improves the brightness of the outgoing surface of the LGP, thereby improving the brightness and definition of images displayed in the liquid crystal panel.

1 . A light guide plate comprising a light guide plate (LGP) substrate, the LGP substrate comprises at least one incident surface for receiving a light beam and one outgoing surface connected to the at least one incident surface, wherein a bidirectional micro-transmissive layer is arranged in the LGP substrate, the bidirectional micro-transmissive layer comprises a plurality of micro-transmissive points having biconvex surfaces. 
     
     
         2 . The light guide plate of  claim 1 , wherein the bidirectional micro-transmissive layer is an array bidirectional micro-transmissive layer. 
     
     
         3 . The light guide plate of  claim 1 , wherein the micro-transmissive points are hollow spheres or quasi-spheres. 
     
     
         4 . The light guide plate of  claim 1 , wherein the LGP is made from polyethylene terephthalate, polycarbonate, polymethylmethacrylate, polyether ether ketone, polyethylene naphthalate, poly ethylene succinate, and/or polypropylene oxidant. 
     
     
         5 . The light guide plate of  claim 3 , wherein the LGP is made from polyethylene terephthalate, polycarbonate, polymethylmethacrylate, polyether ether ketone, polyethylene naphthalate, poly ethylene succinate, and/or polypropylene oxidant. 
     
     
         6 . A fabrication method of a light guide plate, wherein the light guide plate comprising an LGP substrate, the LGP substrate comprises at least one incident surface for receiving a light beam and one outgoing surface connected to the at least one incident surface, wherein a bidirectional micro-transmissive layer is provided in the LGP substrate, the bidirectional micro-transmissive layer comprises a plurality of micro-transmissive points having biconvex surfaces, the fabrication method comprises the following steps:
 S1: loading light guide material into a heating device;   S2: heating the light guide material into molten state by the heating device;   S3: extruding the molten light guide material into molten light guide raw plate by an extrusion equipment;   S4: injecting bubbles into the molten light guide raw plate by controlling a bubbler during the process of extruding the molten light guide material into the molten light guide raw plate; and   S5: shaping to form the light guide plate after extruding the molten light guide raw plate out of a mould mouth.   
     
     
         7 . The method of  claim 6 , wherein step S4 comprises the following steps:
 S41: presetting a distribution pattern of the micro-transmissive points in an automatic control circuit; and   S42: automatically controlling the bubbler to release bubble in accordance with the distribution pattern of the micro-transmissive points by the automatic control circuit.   
     
     
         8 . The method of  claim 7 , wherein step S42 comprises the following steps:
 S421: adjusting sizes of the bubbles through controlling pressure of a pressure holder for injecting gas by the automatic control circuit;   S422: adjusting arrangement density of the bubbles through controlling rotation velocity of a rotating barrel by the automatic control circuit.   
     
     
         9 . The method of  claim 6 , wherein step S5 further comprises:
 S51: forming plastic light guide raw plate after cooling the molten light guide raw plate with circulating water through a cooling device connected to the mould mouth;   S52: rolling the plastic light guide raw plate into plastic light guide sheet by a rolling device;   S53: leading out the plastic light guide sheet by a conveying device and forming light guide sheet after naturally cooling the plastic light guide sheet during the leading-out process;   S54: cutting the light guide sheet into the LGPs by a cutting device.   
     
     
         10 . An extrusion equipment for implementing the fabrication method of a LGP of  claims 6 , the extrusion equipment comprises: a heating device for heating the light guide material, an extrusion device for extruding the molten light guide material, a bubbler for arranging the bubble layer in the molten light guide raw plate, a cooling device for cooling the molten light guide raw plate to the plastic light guide raw plate, a rolling device for rolling the plastic light guide raw plate to the plastic light guide sheet, a conveying device for leading out the plastic light guide sheet, and a cutting device for cutting the naturally cooled light guide sheet into the LGPs according to specification. 
     
     
         11 . The extrusion equipment of  claim 10 , wherein the extrusion equipment further comprises a screw feeding device and a mould mouth connected to an output terminal of the screw feeding device. 
     
     
         12 . The extrusion equipment of  claim 11 , wherein the bubbler is disposed inside the mould mouth of the extrusion equipment. 
     
     
         13 . The extrusion equipment of  claim 12 , wherein the bubbler has an outer barrel, a rotating barrel is provided in the outer barrel, the rotating barrel is fitted in the outer barrel  116  with its rotation shaft  117  passing perpendicularly through both end sides of the outer barrel  116 ; a plurality columns of venting holes is uniformly disposed on the wall of the rotating barrel, and a single column of venting holes corresponding to the positions of the plurality columns of venting holes is disposed on the outer barrel. 
     
     
         14 . The extrusion equipment of  claim 13 , wherein a pressure-holder is provided in the rotating barrel; the pressure-holder comprises a pump that continuously injects gases into the rotating barrel. 
     
     
         15 . The extrusion equipment of  claim 14 , wherein a drive motor for driving the rotating barrel is provided on the rotation shaft and an electric valve is connected to the pressure holder; both the motor and the electric valve are connected to the automatic control circuit through wires. 
     
     
         16 . The extrusion equipment of  claim 15 , wherein the bubbler is horizontally erected inside the mould mouth, and releasing direction of the single column of bubbles by the bubbler is the same as a out - feed direction of the mould mouth. 
     
     
         17 . A backlight module, comprising a LGP. wherein the light guide plate comprises a LGP substrate, the LGP substrate comprises at least one incident surface for receiving a light beam and one outgoing surface connected to the at least one incident surface, wherein a bidirectional micro-transmissive layer is provided in the LGP substrate, the bidirectional micro-transmissive layer comprises a plurality of micro-transmissive points having biconvex surfaces. 
     
     
         18 . The backlight module of  claim 17 , wherein the micro-transmissive points are hollow spheres or quasi-spheres. 
     
     
         19 . The backlight module of  claim 18 , wherein the LGP is made from polyethylene terephthalate, polycarbonate, polymethylmethacrylate, polyether ether ketone, polyethylene naphthalate, poly ethylene succinate, and/or polypropylene oxidant. 
     
     
         20 . A display device, comprising a backlight module, wherein the backlight module comprises a LGP, the LGP comprises a LGP substrate, the LGP substrate comprises at least one incident surface for receiving a light beam and one outgoing surface connected to the at least one incident surface, wherein a bidirectional micro-transmissive layer is provided in the LGP substrate, the bidirectional micro-transmissive layer comprises a plurality of micro-transmissive points having biconvex surfaces.