Recycling backlights with semi-specular components
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United States of America Patent
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Jul 28, 2015
Grant Date -
Mar 13, 2014
app pub date -
Nov 18, 2013
filing date -
May 20, 2007
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Abstract
A recycling cavity such as used in a backlight or similar extended area source includes a front and back reflector, the front reflector being partially transmissive to provide an output illumination area. The recycling cavity also includes a component that provides the cavity with a balance of specular and diffuse characteristics so as to balance cavity efficiency and brightness uniformity over the output area. The component can be characterized by a transport ratio of greater than 15% for a 15 degree incidence angle, and less than 95% for a 45 degree incidence angle.
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