Patent ID: 7845840

Claim:
A light guide plate used for receiving and spreading out the emitting light of at least one point light source, the light guide plate comprising: a light-receiving surface next to the point light source for receiving the emitting light of the point light source; a plurality of first arc-shaped longitudinal structures arranged on the light-receiving surface with their longitudinal directions being substantially parallel with each other; a light-emitting surface through which the light propagating in the light guide plate exits formed at an angle with the light-receiving surface; a plurality of second arc-shaped longitudinal structures arranged on the light-emitting surface with their longitudinal directions being substantially parallel with each other, wherein the longitudinal directions of the second arc-shaped longitudinal structures are substantially parallel with the normal of the light-receiving surface and substantially perpendicular to the longitudinal directions of the first arc-shaped longitudinal structures; a light-reflecting surface opposite to the light-emitting surface for guiding the light passing through the light-receiving surface to the light-emitting surface, the light-reflecting surface being shaped to form a plurality of prismatic structures; and a luminance-adjusting structure formed on part of the light-reflecting surface near the point light source and interlaced with the prismatic structures.