Patent ID: 8708541

Claim:
A backlight module comprising: a light guiding plate, having a emitting surface, a bottom surface opposite to the emitting surface, and a plurality of side surfaces; an optical film, stuck on the emitting surface of the light guiding plate; and at least two positioning structures, placed on two side surfaces opposite to each other, wherein each of the two positioning structures comprises a main positioning member and a sub positioning member, the main positioning member and the sub positioning member are integrally manufactured in a piece, and the sub positioning member is formed by extending an end or all of the main positioning member; wherein the main positioning member is fixed on the side surface of the light guiding plate, a reflection material is spread on an inner side of the main positioning member, the sub positioning member extends for a fixing distance along the main positioning member, and the at least two sub positioning members placed oppositely fix the optical film on the emitting surface of the light guiding plate.