Light guide plate, method of manufacturing same, and backlight module having same

A backlight module comprising:

• a light guide plate comprising:
• a main body comprising a light emitting surface, a bottom surface opposite to the light emitting surface, and a light incident surface connecting the light emitting surface to the bottom surface;
• and
• a plurality of spaced micro-rods on the light emitting surface, each of the micro-rods comprising a top surface on its distal end and a side surface connecting the top surface to the light emitting surface, and comprising a number of layers arranged in an order from the light emitting surface to the top surface, a refraction index of each layer being smaller than a refraction index of previous layer along the direction from the light emitting surface to the top surface, a maximum refraction index of each of the micro-rods being not greater than a refraction index of the main body, each of the micro-rods comprising the first layer, a second layer, a third layer, and a fourth layer;
• a reflection plate adjacent to the bottom surface;
• and
• a light source facing the light incident surface.

A method for manufacturing a light guide plate, comprising:

• providing a main body and a plate, the main body comprising a light emitting surface, the plate defining an array of holes, the plate touching the light emitting surface;
• coating multiple layers of transparent glue in the holes;
• curing the glue to obtain a number of micro-rods directly formed on the light emitting surface, wherein along a direction away from the light emitting surface, a refraction index of each layer of the transparent glue is smaller than a refraction index of a previous layer of the transparent glue, and a maximum refraction index of the transparent glue is not greater than a refraction index of the main body;
• and
• removing the plate to obtain the light guide plate.