Liquid crystalline compounds having a silane diyl group, liquid crystal compositions comprising the same and liquid crystal display devices
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United States of America Patent
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Issued Date -
Apr 25, 2002
app pub date -
May 31, 2001
filing date -
Jun 1, 2000
priority date (Note) -
Abandoned
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Abstract
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) 1 A.sup.4 each independently represent 1,4-cyclohexylene, 1,4-phenylene, etc.; R.sup.1 represents C.sub.1-C.sub.20 alkyl in which any methylene may be replaced by --O--, etc.; R.sup.2 represents halogen, cyano or C.sub.1-C.sub.10, alkyl in which at least one hydrogen is replaced by halogen; and at least one of Z.sup.1, Z.sup.2 and Z.sup.3 represents --SiH.sub.2CH.sub.2-- or --CH.sub.2SiH.sub.2--. 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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