Patent attributes
A light guide plate (2) into which light beams are introduced from a light source has a light incident surface (21) receiving the light beams, a light emitting surface (22) transmitting the light beams therethrough, and a bottom surface (23) opposite to the light emitting surface. 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 (231, 232) for diffusing and reflecting light beams toward the light emitting surface. Each set forms a continuous region at the bottom surface, and the at least two sets totally cover the bottom surface. The at least two sets of include diffusing elements that are formed along two different directions. By utilization of the at least two sets of diffusing elements, the light guide plate provides a uniform luminance over the whole of the light emitting surface.
