| 摘要 |
An antiferroelectric mixture comprising first and second components is provided, the mixing proportions of the first and second components being 60-97 wt. % and 3-40 wt. % based upon the total weight of the two components, respectively, the first component being selected from the group consisting of compounds expressed by the formula (I) and the second component being selected from the group consisting of compounds expressed by the formula (II): are C1-18 alkyl or alkoxy, R2 and R4 are C2-18 alkyl or alkoxy, X and Y are -CH3, -CF3 or -C2F5, rings A, B, C, D and E are 1,4-cyclohexylene, 1,4-phenylene an H atom of which may be replaced by a halogen atom or a cyano group, pyridine-2,5-diyl, pyrimidine-2,5-diyl, pyrazine-2,5-diyl or pyridazine-3,6-diyl, Z is -COO-, -CH2O- or -OCH2-, m and n each are 1 or 2, (m+n) is 3, and Z is 0 or 1. Using the above antiferroelectric liquid crystal composition, a light-switching element having improved the temperature-dependency of threshold electric field and capable of effecting a tristable switching at a high is obtained.
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