Brightness enhancement method and apparatus of light emitting diodes
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United States of America Patent
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Aug 30, 2011
Grant Date -
Apr 8, 2010
app pub date -
Sep 22, 2007
filing date -
Sep 23, 2006
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Abstract
A light source with enhanced brightness includes an angle-selective optical filter and a light emitting diode (LED) having a high reflective layer. The angle-selective filter is located on the top surface of emitting diode to pass lights at specified angles. According to one embodiment, the angle-selective filter includes index-alternating layers. With a reflective polarizer, the light source can produce polarized light with enhanced brightness.
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