Patent ID: 8602629

Claim:
A light guide plate comprising: an input surface for receiving light from a plurality of discrete light sources, an output surface for emitting light, and a bottom surface opposing to the output surface, wherein at least one of the output surface and the bottom surface has a micro-pattern, the micro-pattern comprising micro-lenses distributed in a first direction y-axis that is parallel to the length direction and in a second direction x-axis that is parallel to the width direction; and wherein the micro-lenses have an area density function D I (y) that varies only with y in a first region, an area density function D II (y) that varies only with y in a second region, and an area density function D II (x, y) that varies with both x and y in a third region, area density functions D I (y), D II (y) having minimum values D Imin , D IImin at a first same y value and maximum values D Imax , D IImax at a second same y value, respectively; wherein 1.08≧ D IImin /D Imin ≧1.02, D IImax /D Imax ≧1.20, and D II ( y )> D III ( x,y )> D I ( y ) for a given x.