ILLUMINATION DEVICE WITH SPACED-APART DIFFRACTIVE MEDIA
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United States of America Patent
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Issued Date -
Apr 9, 2015
app pub date -
Oct 9, 2013
filing date -
Oct 9, 2013
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
This disclosure provides systems, methods and apparatus for an illumination system. In one aspect, the illumination system is a light guide that includes spaced-apart regions of medium containing diffractive features. For example, the medium may include holographic medium having holograms that are configured to redirect light, propagating through the light guide, out of the light guide. The spaces between the spaced-apart regions of media may be filled with a material having a lower refractive index than the light guide, thereby functioning as a reflective cladding in those spaces.
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