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twisted nematic phase

A form of liquid crystal widely used in displays, achieved by sandwiching a liquid crystal material between two substrates whose inside surfaces have been prepared with a special coating that aligns the molecular axes. The direction of alignment of one of the substrates is placed perpendicular to that of the second substrate, creating a 90° twist in the liquid crystal molecules. An applied voltage untwists the molecules as they align parallel to the direction of the electrical field, cutting off light transmission through the cell.
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