Patent ID: 7178966

Claim:
A light guide plate into which light beams can be introduced from a light source, comprising: a light incident surface receiving the light beams from the light source; a light emitting surface for emitting the light beams therefrom; and a bottom surface opposite to the light emitting surface; wherein the light incident surface is between the bottom surface and the light emitting surface, the bottom surface has at least two sets of diffusing elements for diffusing and reflecting light beams toward the light emitting surface, each set of diffusing elements forms a continuous region at the bottom surface, the at least two sets of diffusing elements together totally cover the bottom surface, the at least two sets of diffusing elements comprise V-shaped grooves that are oriented in at least two different directions respectively, the V-shaped grooves of all the sets of diffusing elements lie in a same horizontal plane, and the regions formed by the different sets of diffusing elements are adjacent to each other but do not overlap; wherein the at least two sets of diffusing elements comprise three sets of adjacent V-shaped grooves, each of which spans across said bottom surface along a selective direction from a first direction defined from said incident surface to an opposite surface of said light guide member to said incident surface, and a second direction defined between two side surfaces of said light guide member neighboring said incident surface respectively.