Light guide plates having a two-dimensional pattern comprising substantially identical micro-lenses
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United States of America Patent
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Dec 10, 2013
Grant Date -
Jun 13, 2013
app pub date -
Dec 9, 2011
filing date -
Dec 9, 2011
priority date (Note) -
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Abstract
The present invention provides 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 consisting of a plurality of substantially identical micro-lenses, each micro-lens having a width, a length, and an orientation angle. The light guide plate further provides an area density D(x, y) of the micro-lenses varies 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 for y between starting line y0 and ending line, the area density D(x, y=y0) at the starting line y0 varying between a minimal value Dmin and a maximum value Dmax such that Dmin≧1% and 100≧Dmax/Dmin≧2, and wherein the area density D(x,y) repeats in pitch P in the x-axis such that D(x,y)=D(x+P,y).
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