Method and apparatus for the reduction of LCD flicker in micropol based projection systems
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United States of America Patent
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N/A
Issued Date -
Dec 5, 2002
app pub date -
May 8, 2002
filing date -
May 9, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The object of the present invention is to eliminate the flicker of an LCD/Micropol assembly by reducing the excess heat caused by the attachment of the Micropol to the LCD. The present invention solves the problem of LCD flicker caused by excess heating of the LCD/Micropol assembly by reducing the amount of heat transferred to the LCD from the projection lamp. This solution is realized through the use of a special wide-band IR filter that prevents IR radiation from reaching the LCD/Micropol assembly. The IR filter used in the preferred embodiment is based on cholesterol liquid crystal reflectors that are made to reflect IR radiation back into the projection lamp. The excess heat is removed by the projection cooling system and is not transmitted to the LCD display.
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