Cholesteric liquid crystal screen which reflects substantially all of the projected light
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United States of America Patent
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Mar 9, 1993
Grant Date -
N/A
app pub date -
Oct 5, 1990
filing date -
Oct 5, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A screen for use in a front projection system includes a section capable of reflecting light of certain, predetermined wavelengths more than light of other wavelengths. The screen appears black or dark gray when viewed in broadband light. The screen provides for enhanced contrast between incident projected and ambient light. A projector for use with the screen has a light source capable of emitting the predetermined wavelengths.
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