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Liquid crystal display (LCD) modes associated with the rotation of the secondary director in nontilted, biaxial smectic phase of an achiral bent-core compound are demonstrated. For LCDs, we ﬁnd that at least four display modes are possible using SmAPA phase of the studied material, in which the minor directors in adjacent layers are aligned antiferroelectrically. The advantages of these modes include low driving ﬁeld (1–2 V/ µm), high contrast ratio 1000:1, relatively fast switching time of 0.5 ms and continuous gray scale. The molecular short axis or the polar axis in a negative dielectric, biaxial material is oriented by the in-plane electric ﬁeld by a combination dielectric biaxiality and polarity at low electric ﬁelds and polarity at higher ﬁelds.
Keith, C. et al. (2010). Liquid crystal display modes in a nontilted bent-core biaxial smectic liquid crystal. Applied Physics Letters , vol. 97, pp. 1-3. doi:10.1063/1.3513832