Light guide plate and fabrication method thereof, extrusion equipment, backlight module and display device

A fabrication method of a light guide plate, wherein the 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 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 by the extrusion equipment, wherein the extrusion equipment extrudes the molten light guide material to the bubbler and the bubbler separates the molten light guide material into an upper layer and a lower layer and starts to inject said bubbles at this point;
• and
• S5:
• shaping to form the light guide plate after extruding the molten light guide raw plate out of a mould mouth.