Patent ID: 8821002

Claim:
A light guide plate, characterized in that: the light guide plate comprises: a light-incident surface; and a plurality of elongated microstructures disposed on one side which is opposite to a light-emitting surface of the light guide plate, and parallel to the light-incident surface, wherein at least one curve parameter of profiles of the elongated microstructures is altered according to a position variation in an extending direction of the elongated microstructures, so as to adjust a brightness distribution in the extending direction of the elongated microstructures; wherein the at least one curve parameter of the profiles of the elongated microstructures is a curvature radius, an arc length, a tangential edge angle between a profile curve and the light guide plate, a base angle, a width or a height; wherein the curve parameter of each of the microstructures is symmetrically varied in the extending direction; wherein the curve parameter of each of the microstructures is varied discontinuously or continuously; wherein the profiles of the elongated microstructures are arcs, and when a curvature radius of the profiles is altered according to the position variation in the extending direction of the elongated microstructures, the curvature radius of the profiles at the middle position of the elongated microstructures is less than the curvature radius of the profiles at both sides of the elongated microstructures.