摘要 |
Liquid crystal compositions which comprise as a first component at least one compound selected from the group of compounds represented by the formula (I) and as a second component at least one compound selected from the group of compounds represented by the formula (II), the content of the first component being not less than 30% by weight based on the total weight of the composition wherein R1 and R3 are independently an alkyl of 1 to 10 carbon atoms and any -CH2- in the alkyl may be replaced by -O- or -CH=CH-; R2 is an alkyl of 1 to 10 carbon atoms, -F or -Cl; X1, X2, X3, X4, X5, X6, X7, X8 and X10 are independently -F or -H; X9 is -F, -Cl, -CF3, -OCF3 or -OCF2H; A1 and A2 are independently 1,4-cyclohexylene, pyrimidine-2,5-diyl or 1,4-phenylene in which any -H may be replaced by -F; Z1 and Z3 are independently a single bond, -(CH2)2- or -(CH2)4-; Z2 is a single bond or -CF2O-; and Z4 is a single bond, -COO- or -CF2O-. These compositions have reduced response time and low threshold voltage, and are used in a liquid crystal display device, especially that of an OCB mode.
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