2,3-DIFLUOROPHENYL DERIVATIVES HAVING NEGATIVE VALUE OF PERMITTIVITY ANISOTROPY, LIQUID-CRYSTAL COMPOSITION, AND LIQUID-CRYSTAL DISPLAY ELEMENT
申请人:CHISSO CORPORATION
公开号:EP1026142A1
公开(公告)日:2000-08-09
The invention is to provide liquid crystalline compounds having a negative and large dielectric anisotropy value and a small optical anisotropy value; liquid crystal compositions comprising the compound; and liquid crystal display devices fabricated by using the liquid crystal composition; the liquid crystalline compounds have 2,3-difluorophenyl moiety and are expressed by the general formula (1)
wherein Ra and Rb represent an alkyl group or alkoxy group having 1 to 10 carbon atoms, but any one or more methylene groups in at least one of the Ra and Rb are replaced by cyclopropane-1,2-diyl, -CF2-, or -CFH-; ring A1 to ring A4 represent cyclohexane-1,4-diyl or 1,4-phenylene, but at least one of the ring A3 and ring A4 represents 2,3-difluoro-1,4-phenylene; Z1, Z2, and Z3 represent single bond, -(CH2)p-, -CO2-, -CF2O-, or -CH2O-; p is an integer of 2 to 4; and m and n are 0 or 1.
本发明旨在提供具有负的、大的介电各向异性值和小的光学各向异性值的液晶化合物;包含该化合物的液晶组合物;以及使用该液晶组合物制造的液晶显示设备;该液晶化合物具有 2,3-二氟苯基分子,并由通式 (1) 表示
其中 Ra 和 Rb 代表具有 1 至 10 个碳原子的烷基或烷氧基,但至少 Ra 和 Rb 中的一个或多个亚甲基被环丙烷-1,2-二基、-CF2-或-CFH-取代;环 A1 至环 A4 代表环己烷-1,4-二基或 1,4-亚苯基,但环 A3 和环 A4 中至少有一个代表 2,3-二氟-1,4-亚苯基; Z1、Z2 和 Z3 代表单键、-(CH2)p-、-CO2-、-CF2O-或-CH2O-;p 为 2 至 4 的整数;m 和 n 为 0 或 1。