Patent ID: 8641215

Claim:
A backlight module, comprising: a light guide plate comprising a bottom surface, a first light incident surface, and a second light incident surface, wherein the first light incident surface and the second light incident surface are disposed at two opposite ends of the bottom surface; a plurality of first optical structures, formed on the bottom surface, extending along the first light incident surface, each of the first optical structures including a first inclined surface and a second inclined surface, wherein the first inclined surface and the second inclined surface respectively correspond to the first light incident surface and the second light incident surface and are connected to each other at an angle, a first angle between the first inclined surface and the bottom surface is smaller than a second angle between the second inclined surface and the bottom surface; a reflector disposed on the bottom surface; a first light source disposed along the first light incident surface a second light source disposed along the second light incident surface; and at least one optical film, wherein the light guide plate comprises a light exit surface opposite to the bottom surface, the optical film is disposed on the light exit surface, and on a surface of the optical film, a plurality of second optical structures are disposed abreast with each other and parallel to the first optical structures of the light guide plate, wherein lights emitted from the first light source and the second light source respectively enter into the light guide plate from the first light incident surface and the second light incident surface, then are refracted by the first inclined surface and the second inclined surface to the reflector and reflected by the reflector back to the light guide plate from the first inclined surface or the second inclined surface.