2-fluorobenzonitrile derivatives and their use in optical display devices
申请人:Merck Patent Gesellschaft Mit Beschrankter Haftung
公开号:US04784471A1
公开(公告)日:1988-11-15
The instant invention relates to compounds of the following formula: ##STR1## wherein R.sup.0 is H or linear alkyl of 1 to 7 C atoms, p is 1 or 2 and n is 0 or 2. The compounds are useful as liquid crystalline compositions in electrooptical display devices.
Liquid crystal compound exhibiting a low driving voltage, a liquid crystal phase within a broad temperature range and a good compatibility with other known liquid crystal compounds at low temperatures is provided, which compound is expressed by the formula
wherein R is H or a linear or branched alkyl group of 1-10C, X is H or F, and a vinyl group has a transconfiguration, and which compound has a high dielectric anisotropy value for its relatively low viscosity and can drive liquid crystal display elements under a low voltage, and further exhibits a liquid crystal phase within a broad temperature range of about room temperature to about 200°C, and exhibits a good compatibility with many other liquid crystalline compounds.
本发明提供的液晶化合物具有低驱动电压、宽温度范围内的液晶相以及在低温下与其他已知液晶化合物的良好兼容性,该化合物的表达式为
其中 R 是 H 或 1-10C 的直链或支链烷基,X 是 H 或 F,乙烯基具有反式构型,该化合物因其相对较低的粘度而具有较高的介电各向异性值,可在低电压下驱动液晶显示元件,还可在约室温至约 200°C 的宽温度范围内显示液晶相,并与许多其他液晶化合物具有良好的兼容性。