Patent ID: 7677783

Claim:
A backlight module, comprising: a light guide plate having uniform thickness and a light incident surface having a height substantially the same as said uniform thickness; and at least one point light source having a light emitting body and a light guide portion configured for guiding light beams into the light guide plate through the light incident surface; wherein the light guide portion has a generally wedged-shaped or pyramidal frustum structure, a thin end of the light guide portion is configured as a light emission end and faces the light incident surface of the light guide plate, and a thick end opposite to the thin end of the light guide portion is adjacent to the light emitting body, the light guide portion comprises a first side surface, a second side surface, a third side surface, and a fourth side surface, and the first side surface, the second side surface, the third side surface, and the fourth side surface are arranged end-to-end; the light emitting body comprises an illuminating portion configured for providing the light beams, and a shell packaging the illuminating portion; and the shell has a cuboidal structure comprising a first sidewall, a second sidewall, a third sidewall, and a fourth sidewall, and the first side surface, the second side surface, the third side surface, and the fourth side surface of the light guide portion respectively extend from the first sidewall, the second sidewall, the third sidewall, and the fourth sidewall.