| 摘要 |
Liquid crystalline compounds which have large dielectric anisotropy, high electrical insulation properties (high specific resistance or high voltage holding ratio), small temperature dependence, broad liquid crystal phase temperature range, excellent compatibility and low viscosity and which are represented by formula (1) A4 each independently represent 1,4-cyclohexylene, 1,4-phenylene, etc.; R1 represents C1-C20 alkyl in which any methylene may be replaced by -O-, etc.; R2 represents halogen, cyano or C1-C10, alkyl in which at least one hydrogen is replaced by halogen; and at least one of Z1, Z2 and Z3 represents -SiH2CH2- or -CH2SiH2-. Further, liquid crystal compositions comprising at least one liquid crystalline compound of formula (1) and liquid crystal display devices composed of the compositions, which can exhibit low threshold voltage, high electrical insulation properties and low viscosity.
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