Abstract
Abstract The influence of materials and cell parameters on the hysteresis effect in a supertwisted nematic LCD composed of chiral nematic layers is theoretically investigated. The variation of tilt angle of the director in a midplane of the LC layer with an applied voltage change is numerically calculated. Transition voltage Vn1 , recovery voltage Vn2 and reduced hysteresis width H=(Vn1 - Vn2)/Vn1 are evaluated under the different combinations of such parameters as the elastic constant ratios k = k33/k11 and ξ = k33/k22 , dielectric anisotropy Δe, pretilt angles θo on the electrode surfaces, total twist angle φ and the thickness of the LC layer d. The lower limits of the cell thickness and the pretilt angle, as well as the total twist angle, below which the bistable range completely disappears, are found to exist. The influence of various parameters on those characters are investigated.
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