Patent ID: 7354185

Claim:
A light guiding plate, comprising: a light incident surface; a light emitting surface; and a bottom surface parallel and opposite to the light emitting surface, the bottom surface defining a plurality of dissymmetric protrusions, and a common reference line shared by the protrusions, each of the protrusions comprising a first side close to the light incident surface, and a second side away from the light incident surface, and each of the protrusions defining an angle Î± between the first side and the reference line, and an angle Î² between the second side and the reference line, wherein the angle Î± of the protrusions progressively decreases along a direction away from the light incident surface, the angle Î² of the protrusions progressively increases along the direction away from the light incident surface, and for the protrusion nearest to the light incident surface, the angle Î± is four times the value of the angle Î².