Variable transmittance birefringent device

摘要: A variable reflectance mirror employing a super-twisted nematic (STN) liquid crystal cell to control reflectivity. The STN includes layer of material formed between pair transparent electrodes, where polymer alignment is over the electrodes so as orient possess twist angle approximately 180° and 270°. crossed polarizers are respectively positioned on outer surfaces front rear plates. reflective further adjacent surface polarizer plate. connected voltage source apply an electrical bias across layer, transmitivity light can be varied by varying applied vary birefringence layer. degree reflection provided adjusted adjusting stacked IC circuit for controlling