Patent ID: 8388159
Filing Date: 2013-03-05
Classification: G02B,G02F

Abstract:
1. A light guide plate, comprising: a bottom surface, a top surface opposite to the bottom surface, and at least one lateral side; and a recess defined at the top surface, the recess is concaved toward the bottom surface and has a reflective surface, and only one part of the reflective surface has reflective structure located thereon, wherein the reflective surface comprises a first area and a second area, and the reflective structure is located on the second area; a first light incident angle in the first area is greater than a total reflection critical angle of the light guide plate, and a second light incident angle in the second area is smaller than the total reflection critical angle of the light guide plate; the recess is a cone, and a semidiameter ‘R’ of the cone satisfies the following formula: R=H*tanθ