Patent ID: 7967493
Filing Date: 2011-06-28
Classification: G02B

Abstract:
1. A light guide plate having a light incident surface, a light emitting surface and a bottom surface, the bottom surface being opposite to the light emitting surface, the light incident surface being connected between the light emitting surface and the bottom surface, the bottom surface having a plurality of light guide units disposed thereon, the light guide units being protruded out from the bottom surface, each of the light guide units having a first curved surface and a second curved surface connected with the first curved surface, both of the first curved surface and the second curved surface being convex surfaces, in a cross section perpendicular to the light incident surface and the bottom surface and passing through the first curved surface and the second curved surface, the first curved surface and the cross section intersecting in a first curved line, the second curved surface and the cross section intersecting in a second curved line, a curvature radius of the first curved line being greater than a curvature radius of the second curved line, in each of the light guide units, the second curved line being nearer to the light incident surface relative to the first curved line, and both of the first curved line and the second curved line being convex lines, wherein, a joint of the first curved surface and the second curved surface is located at a first reference plane parallel with the light incident surface, the curvature radius of the first curved line is R