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We developed a bistable cholesteric reflective display using a dual-frequency cholesteric liquid crystal. The material exhibits two stable states at zero field: Bragg reflecting planar texture and nonreflecting (weakly scattering) focal conic texture. It can be switched directly from the planar texture to the focal conic texture by a low-frequency voltage and back to the planar texture by a high-frequency voltage. We have designed a drive scheme for the display, which uses simultaneous application of both low- and high-frequency voltages and cumulative effect of the cholesteric liquid crystals.
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Xu et al. (1999) studied this question.
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