Twisted nematic field effect refers to a configuration commonly used in liquid crystal displays (LCDs) that involves a specific arrangement of liquid crystal molecules. In particular, the "twisted nematic" (TN) structure is characterized by the orientation of liquid crystal molecules being twisted at an angle across a thin layer of liquid crystal material. Here's a breakdown of the concepts involved: 1. **Liquid Crystals**: These materials have properties between those of liquids and solid crystals.
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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.