LED HEAD AND PHOTON EXTRACTOR
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United States of America Patent
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Issued Date -
Jul 18, 2013
app pub date -
Mar 7, 2011
filing date -
Mar 6, 2010
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The invention concerns a semiconductor based light source comprising a back part, a front side and at least one semiconductor chip having an emitting surface, at least one reflective optical element being arranged below said at least one semiconductor chip, a material with low refractive index being disposed on a side of said reflective optical element facing said front side, wherein said semiconductor based light source comprises on said front side a compound material with high refractive index having at least one diffractive optical element embedded therein, such as to direct light incident on said diffractive optical element towards preferred directions.
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