Provided are liquid crystalline compounds having an extremely large dielectric anisotropy value, liquid crystal compositions comprising the compound and having a low driving voltage, and liquid crystal display devices fabricated by using the liquid crystal composition; and the liquid crystalline compounds are expressed by the general formula (1)
wherein Ra represents a straight chain or branched alkyl group having 1 to 20 carbon atoms; Rb represents a group selected from Ra, a halogen atom, or cyano group; Rc and Rd each independently represent hydrogen atom or an alkyl group having 1 to 3 carbon atoms; A1, A2, A3, and A4 each independently represent pyridine oxide, pyrimidine dioxide, trans-1,4-cyclohexylene, or 1,4-phenylene provided that at least one of A1, A2, A3, and A4 is pyridine oxide ring or pyrimidine dioxide ring; Re represents hydrogen atom, a halogen atom, or an alkyl group having 1 to 3 carbon atoms; Z1, Z2, and Z3 each independently represent single bond or an alkylene group having 1 to 4 carbon atoms one or more hydrogen atoms in which group may be replaced by halogen atoms; m, n, and p are each independently 0 or 1 provided that p is 0 when A4 is pyridine oxide ring bonded, at its position 4, to Z3; and the atom which constitutes these compounds may be replaced by its isotope.
本发明提供了具有极大介电各向异性值的液晶化合物、包含该化合物且具有低驱动电压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;该液晶化合物由通式(1)表示
其中 Ra 代表具有 1 至 20 个碳原子的直链或支链烷基;Rb 代表选自 Ra、卤素原子或
氰基的基团;Rc 和 Rd 各自独立地代表氢原子或具有 1 至 3 个碳原子的烷基;A1、A2、A3 和 A4 各自独立地代表氧化
吡啶、二氧化
嘧啶、反式-1,4-
环己烯或 1,4-亚苯基,条件是 A1、A2、A3 和 A4 中至少有一个是氧化
吡啶环或二氧化
嘧啶环;Re代表氢原子、卤素原子或具有 1 至 3 个碳原子的烷基;Z1、Z2 和 Z3 各自独立地代表单键或具有 1 至 4 个碳原子的亚烷基,其中的一个或多个氢原子可由卤素原子取代;m、n 和 p 各自独立地为 0 或 1,条件是当 A4 是氧化
吡啶环,在其第 4 位与 Z3 键合时,p 为 0;构成这些化合物的原子可由其同位素取代。