Wide band variable transmittance optical device
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United States of America Patent
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Dec 6, 2016
Grant Date -
Mar 10, 2016
app pub date -
Sep 14, 2015
filing date -
Oct 4, 2010
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Abstract
We describe a wide band variable transmission optical device having an electronically active cell comprising a guest-host mixture of a liquid crystal host and a dichroic guest dye material contained between a pair of plastic substrates. The liquid crystal host has an axis orientation that is alterable between a clear state orientation and a dark state orientation and the dichroic guest dye material includes one or more dichroic dyes. The optical device is characterized in that it exhibits a wide absorption band that is greater than 175 nm within a visible wavelength range of 400-700 nm, has a clear state transmission equal to or above 30% and a dark state transmission equal to or below 40%.
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