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Abstract
A set of symmetry properties of a 90° twisted nematic (TN) cell under rotation of polarizers has been observed both cxpcrimentally and theoretically for the first time. These symmetry properties can he explained by an argument based on rotation and time reversal transformations. The use of these symmetry properties allows one to answer the long time puzzle as to whether the e-mode TN cell, in which the transmission axis of the entrance polarizer is parallel to the entrance rubbing direction, is superior to the o-mode TN cell, in which the transmission axis of the entrance polarizer is perpendicular to the entrance rubbing direction, for both normally white and normally black cases. In addition, these symmetry propertics provide us with a useful test for any existing TN LCD computer simulation program.