Patent ID: 9223077
Filing Date: 2015-12-29
Classification: G02B

Abstract:
1. A light guide plate, comprising: a first surface; a second surface opposite to the first surface; at least one light incident surface connecting the first surface and the second surface; and a plurality of groove sets, each groove set separately disposed from the other groove set on the second surface, wherein each of the groove sets comprises a plurality of curved grooves, each of the curved grooves has a curved inclined reflective surface, a curved back-to-light surface, and a bottom surface connected to the curved inclined reflective surface and the curved back-to-light surface, the curved inclined reflective surface is inclined with respect to the first surface, the curved grooves of each of the groove sets curve toward a same curving direction, the curved inclined reflective surface of one of two adjacent curved grooves is connected to the curved back-to-light surface of the other one of the two adjacent curved grooves through a connection surface, and an absolute value of a slope of any tangent line of any point on the connection surface relative to the first surface is less than 1.7, wherein the curved grooves of the groove sets have a plurality of different curvature radii, a number density on an end of the light guide plate away from the light incident surface is greater than a number density on an end of the light guide plate close to the light incident surface for the groove sets with a largest curvature radius, a number density on the end of the light guide plate away from the light incident surface is smaller than a number density on the end of the light guide plate close to the light incident surface for the groove sets with a smallest curvature radius, and the groove sets having a middle curvature radius are distributed entirely on the light guide plate, wherein the middle curvature radius is between the largest curvature radius and the smallest curvature radius.