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How thick is the liquid crystal layer in a typical twisted-nematic cell?
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liquid crystal display
Liquid crystal arrangements
In nematic arrangements the crystals are randomly positioned with all their long axes pointing in essentially the same direction, given by a vector known as the director. In smectic arrangements the crystals are further constrained to parallel planes; in smectic A the director is perpendicular to these planes, while in smectic C the director is at some other angle to the planes.
In a typical twisted-nematic cell, the liquid crystal layer is contained within a narrow gap between two substrate plates that measures approximately 5 to 10 micrometres in thickness.1