= Twisted nematic field effect
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The <twisted nematic field effect> switches a <nematic liquid crystal> between a twisted optically rotating state and a largely field-aligned state. With <adiabatic optical following in a twisted nematic> and crossed <polarizers> aligned to the two planar surface directors, a quarter-turn cell passes light at low voltage and suppresses it at high voltage. A rear reflector permits reflective operation with little power expended on light generation.
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