PLANAR ILLUMINATING DEVICE
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United States of America Patent
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Issued Date -
Apr 25, 2013
app pub date -
Nov 20, 2011
filing date -
Oct 25, 2011
priority date (Note) -
Abandoned
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Abstract
A planar illuminating device includes a number of light sources and an optical sheet positioned at a side of the light sources. The optical sheet includes an incident surface facing the light sources and an emergent surface opposite to the incident surface. The incident surface includes a number of protruding prism structures. The emergent surface includes a number of concave diffusing micro-structures.
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