Light guide plate having uniform light emission and backlight module including same

A backlight module, comprising:

• a light guide plate comprising:
• a light incident surface;
• a bottom plate;
• a light emitting surface opposite to the bottom plate;
• and
• a side surface opposite to the light incident surface;
• wherein the light incident surface and the side plate are connected between the light emitting surface and the bottom surface, the bottom surface is imaginarily divided into a plurality of rectangular sub-portions, the sub-portions are continuously and uniformly distributed, the shapes and the areas of the sub-portions are the same as each other, a long side of each of the sub-portions is parallel to the light incident surface, each of the sub-portions uniformly distributes a plurality of micro protrusions, the shapes of the micro protrusions are the same as each other, a portion of the sub-portions close to the side surface constitutes a first main portion, the micro protrusion densities of the sub-portions in the first main portion gradually ascend along a direction from the light incident surface to the side surface;
• the difference values of the micro protrusion densities of any two adjacent sub-portions of the first main portion gradually ascend along the direction from the light incident surface to the side surface;
• and
• a light source device facing the light incident surface.