CHLOROFLUOROBENZENE LIQUID CRYSTALLINE COMPOUND, LIQUID CRYSTAL COMPOSITION, AND LIQUID CRYSTAL DISPLAY ELEMENT
申请人:Chisso Corporation
公开号:EP1873134A1
公开(公告)日:2008-01-02
Such a liquid crystal compound is provided that has stability to heat, light and so forth, has a nematic phase in a wide temperature range, has a small viscosity, a suitable optical anisotropy, and suitable elastic constants K33 and K11 (K33: bend elastic constant, K11: splay elastic constant), and has suitable negative dielectric anisotropy and excellent compatibility with other liquid crystal compounds. A liquid crystal composition containing the liquid crystal compound, and a liquid crystal display device containing the liquid crystal composition are also provided.
The liquid crystal compound is represented by one of formulas (a) to (d), the liquid crystal composition contains the liquid crystal compound, and the liquid crystal display device contains the liquid crystal composition:
wherein Ra and Rb are independently linear alkyl or linear alkoxy, rings A1, A2, B and C are independently trans-1,4-cyclohexylene or 1,4-phenylene, Z11, Z12, Z2 and Z3 are independently a single bond or alkylene, and one of X1 and X2 is fluorine, and the other thereof is chlorine.
所提供的这种液晶化合物对热、光等具有稳定性,在宽温度范围内具有向列相,粘度小,具有适当的光学各向异性和适当的弹性常数 K33 和 K11(K33:弯曲弹性常数,K11:平展弹性常数),并具有适当的负介电常数和与其他液晶化合物的良好兼容性。此外,还提供了一种含有该液晶化合物的液晶组合物和一种含有该液晶组合物的液晶显示设备。
液晶化合物由式(a)至(d)之一表示,液晶组合物包含该液晶化合物,液晶显示装置包含该液晶组合物:
其中 Ra 和 Rb 独立地为直链烷基或直链烷氧基,环 A1、A2、B 和 C 独立地为反式-1,4-环己烯或 1,4-亚苯基,Z11、Z12、Z2 和 Z3 独立地为单键或亚烷基,X1 和 X2 中的一个为氟,另一个为氯。