Nightvision compatible display with electrically activated infrared filter
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United States of America Patent
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Mar 25, 1997
Grant Date -
N/A
app pub date -
Aug 12, 1994
filing date -
Aug 12, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electrically activated infrared filter utilizes a mixture of infrared absorbing dyes in liquid crystal which normally presents a substantial cross section of dye to absorb the infrared component of impinging light. Polarizing light to be parallel to the direction of liquid crystal alignment enhances the absorption of infrared components. In an alternative embodiment, a chiral additive to the liquid crystal solution increases the dye cross section density which, by absorption, attenuates a higher proportion of the infrared wavelengths. A predetermined voltage differential across the cell aligns the liquid crystal and dye molecules to the voltage gradient, presenting a substantially non-absorptive path to the infrared components of impinging light.
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