METHOD FOR REDUCING HOT SPOTS IN LIGHT GUIDE PLATES
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United States of America Patent
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Issued Date -
Dec 12, 2013
app pub date -
Jun 12, 2012
filing date -
Jun 12, 2012
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Abstract
The present invention provides a method of reducing hot spots in a light guide plate, the light guide plate comprising an input surface for receiving light from a plurality of discrete light sources, an output surface for emitting light, a bottom surface opposing to the output surface, and an end surface opposing to the input surface. The method further provides distributing a set of lenses in the core zone and a set of micro-lenses in the mixing zone, wherein the density of the set of micro-lenses stays constant in the X-axis, and a size and density of the micro-lenses is selected to redirect the light from the discrete light sources toward the Y-axis and provide a ratio L1/L0 that is between 0.9 and 1.1 for any Y≧Y1.
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