Provided are liquid crystalline compounds which have an extremely high voltage holding ratio, are considerably small in its alteration caused by the change of temperature, and have a low threshold voltage and a high Δn; liquid crystal compositions comprising the liquid crystalline compound; and liquid crystal display devices fabricated by using the liquid crystal composition;
the liquid crystalline compound is expressed by the general formula (1)
wherein R represents an alkyl group having 1 to 20 carbon atoms in which alkyl group any not-adjacent methylene group (-CH2-) may be replaced by oxygen (-O-) atom; Y1 to Y16 independently represent hydrogen atom or fluorine atom, but at least three of them are fluorine atoms, provided that in no case three or more hydrogen atoms of one 1,4-phenylene group are replaced by fluorine atom; X represents a halogen atom or an alkyl group having 1 to 20 carbon atoms in which alkyl group any not-adjacent methylene group may be replaced by oxygen atom, and any hydrogen atom in the alkyl group may be replaced by fluorine atom; Z1, Z2, and Z3 independently represent -(CH2)2-, -(CH2)4-, -CH2O-, -OCH2-, -(CH2)3O-, -O(CH2)3-, or single bond; and any atom which constitutes this compound may be replaced by its isotope; provided that when X = -OCF2CF2H, Z1 = Z3 = single bond, and Z2 = -(CH2)2-, in no case
Y6 = Y10 = Y12 = F, and Y1 to Y5 = Y7 to Y9 = Y11 = Y13 to Y16 = H;
Y2 = Y10 = Y12 = F, and Y1 = Y3 to Y9 = Y11 = Y13 to Y16 = H; or
Y2 = Y4 = Y10 = Y12 = F, and Y1 = Y3 = Y5 to Y9 = Y11 = Y13 to Y16 = H.
本发明提供了具有极高电压保持率、温度变化对其影响极小、阈值电压低且Δn 高的液晶化合物;包含该液晶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;
液晶化合物由通式(1)表示
其中 R 代表具有 1 至 20 个碳原子的烷基,在该烷基中,任何不相邻的亚甲基(-
CH2-)可被氧原子(-O-)取代;Y1 至 Y16 独立地代表氢原子或
氟原子,但其中至少有三个是
氟原子,条件是在任何情况下,一个 1,4-亚苯基基团的三个或三个以上氢原子都不能被
氟原子取代;X 代表卤素原子或具有 1 至 20 个碳原子的烷基,在该烷基中,任何不相邻的亚甲基可被氧原子取代,烷基中的任何氢原子可被
氟原子取代;Z1、Z2 和 Z3 独立地代表-( )2-、-( )4-、- O-、-O -、-( )3O-、-O( )3- 或单键;构成该化合物的任何原子可被其同位素取代;但当 X = -O
CF2CF2H、Z1 = Z3 = 单键和 Z2 = -( )2- 时,在任何情况下均不得
Y6 = Y10 = Y12 = F,Y1 至 Y5 = Y7 至 Y9 = Y11 = Y13 至 Y16 = H;
Y2 = Y10 = Y12 = F,且 Y1 = Y3 至 Y9 = Y11 = Y13 至 Y16 = H;或
Y2 = Y4 = Y10 = Y12 = F,Y1 = Y3 = Y5 至 Y9 = Y11 = Y13 至 Y16 = H。