Asymmetric serrated edge light guide film having elliptical base segments
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United States of America Patent
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Jul 9, 2013
Grant Date -
Mar 14, 2013
app pub date -
Sep 12, 2011
filing date -
Sep 12, 2011
priority date (Note) -
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Abstract
The present invention provides a planar light guide film for a backlight unit having at least one point light source, the light guide film comprising a light input surface for receiving light from the point light source, a light redirecting surface for redirecting light received from the light input surface and a light output surface for outputting at least the light redirected from the light redirecting surface. The light input surface further comprises a composite lens structure having a circular tip segment with a first contact angle, and a first and second elliptical base segments with a second contact angle, the second contact angle being less than the first contact angle and the second contact angle being equal to each other.
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