Method and apparatus to minimize lamp flicker and increase contrast ratio in projection devices
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United States of America Patent
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Aug 4, 2009
Grant Date -
Jun 29, 2006
app pub date -
Aug 25, 2005
filing date -
Dec 16, 2004
priority date (Note) -
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Abstract
A variable retarder is inserted in a polarized light beam. The retardance of the variable retarder is increased when the light beam increases in brightness and is decreased when the light beam decreases in brightness. The amount of increase and/or decrease in retardance is calculated to stabilize the brightness of the light beam. The variable retarder may be used in conjunction with an auto-iris and share a same brightness detector.
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