Patent ID: 8033709

Claim:
A light guide plate comprising: a light incidence face, the light guide plate being tapered from the light incidence face to a side opposite the light incidence face; a plurality of incidence areas, each incidence area comprising a plurality of surfaces formed by a plurality of elliptically-shaped closed curves defining protrusions or recesses having different sizes arranged alternately in a matrix arrangement along a first direction and a second direction which is substantially perpendicular to the first direction, wherein each of plurality of incidence areas is spaced apart from adjacent incidence areas by areas devoid of the elliptically-shaped closed curves, and wherein the plurality of incidence areas collectively cover more than half a surface area of the light incidence face, and wherein each incidence area further comprises spacing between the protrusions or recesses where the protrusions or recesses and the spacing are distributed such that the protrusions or recesses cover more than half a surface area of each incidence area; and a light emission face substantially perpendicular to the light incidence face, wherein the first direction is perpendicular to the emission face.