The optical switching time of twisted-nematic liquid-crystal cells using the liquid crystals, 5CB, 50CB, and PCH5 have been characterized as a function of temperature, prebias voltage and switching voltage, V. The transition time from 90 % to 10 % transmission scales as V-1.9 and is limited to 30 to 50 ns by the liquid-crystal breakdown electric field. The time from the initial switching voltage step to 90 % transmission, delay ...
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