Patent ID: 7448786

Claim:
A backlight module, comprising: a light guide plate having: an emitting surface; a bottom surface opposite to the emitting surface; a plurality of side surfaces interconnecting the emitting surface and the bottom surface; an incident surface disposed at a corner portion thereof adjoining to two adjacent side surfaces, the incident surface having at least two incident portions, and the incident portions respectively facing different directions, each incident portion defines a plurality of first microstructures adjacent to the corresponding side surfaces and a plurality of second microstructures adjacent to a center portion of the incident surface only; and a through hole defined in the corner portion adjacent to the incident surface, a plurality of third microstructures are defined on inside wall of the through hole adjacent to the incident surface, the third microstructures are defined at a side adjacent to the incident surface and are positioned corresponding to a position behind an area between the first microstructures adjacent to the corresponding side surfaces and the second microstructures adjacent to a center portion of the incident surface only; and at least two light emitters being disposed adjacent to the incident surface, each of the light emitters positioned corresponding to a respective one of the incident portions and configured for emitting light into the light guide plate via said respective one of the incident portions.