| 摘要 |
Novel ferroelectric and antiferroelectric liquid crystal compounds of the invention, which comprise those showing optically tristable states in phase S*(3), have a wide range of phase transition temperature so as to be not only preferably used solely as display element material but also mixed with any other liquid crystal to desiredly expand the above range wider and make optical response time faster. Typical compounds are represented by <IMAGE> +TR <IMAGE> <IMAGE> +TR <IMAGE> <IMAGE> +TR <IMAGE> in which Z means CF3, C2F5, CHF2, CH2F, CClF2, CCl2F, CF3CCl2 or C3F7, m' and n' are same or different with each other and each is an integer of 1-20.
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