Liquid crystal composition and liquid crystal display element using the same
The liquid crystal composition of the present invention can be used in a liquid crystal display element of an IPS type or a TN type in which display defects such as burn-in and dropping marks in high speed response are unlikely to be generated. Since the liquid crystal composition contains a component which is a dielectrically positive component including a dielectrically positive compound and a dielectrically neutral component of which dielectric anisotropy is greater than −2 and less than +2, the liquid crystal composition has excellent characteristics that the liquid crystal composition has a liquid crystal phase in a wide temperature range, low viscosity, excellent solubility at a low temperature, high specific resistance and a high voltage holding ratio, and is stable with respect to heat and light.
1. A liquid crystal composition having positive dielectric anisotropy, comprising:
a component (A) which is a dielectrically positive component containing a compound represented by formula (1), a compound represented by general formula (2), and a compound represented by formula (12.2); and
a dielectrically neutral component (B) of which dielectric anisotropy is greater than −2 and less than +2 including a compound represented by formula (40), two or more types of compounds represented by general formula (9), and a compound represented by formula (4.4),
wherein the compound represented by general formula (40) is contained in an amount of 29% by mass or more with respect to the total amount of the liquid crystal composition:
(wherein in formula (2), R 2 represents an alkyl group having 2 to 5 carbon atoms, A 2 represents a 1 ,4-phenylene group or a 1 ,4-cyclohexylene group, each of X 21 to X 24 independently represents a hydrogen atom or a fluorine atom, U 2 represents a single bond, and Y 2 represents a fluorine atom or —OCF 3 ),
(wherein, each of R 91 and R 92 independently represents an alkyl group having 2 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and each of X 91 and X 92 independently represents a hydrogen atom or a fluorine atom).
2. The liquid crystal composition according to claim 1 , comprising:
one type or two or more types of compounds represented by general formula (6) as the dielectrically positive component (A):
(wherein, R 6 represents an alkyl group having 2 to 5 carbon atoms, each of X 65 to X 66 independently represents a hydrogen atom or a fluorine atom, Y 6 represents a fluorine atom or —OCF 3 , and U 6 represents a single bond or —CF 2 O—).
3. The liquid crystal composition according to claim 1 , comprising:
one type or two or more types of compounds represented by general formula (8) as the dielectrically positive component (A):
(wherein, R 8 represents an alkyl group having 2 to 5 carbon atoms, A 8 represents a 1,4-phenylene group or a 1,4-cyclohexylene group, and each of X 86 to X 89 independently represents a hydrogen atom or a fluorine atom).
4. The liquid crystal composition according to claim 1 , comprising:
a compound represented by formula (10):
5. The liquid crystal composition according to claim 1 , comprising:
one type or two or more types of compounds represented by general formula (16) as the dielectrically neutral component (B):
(wherein, R 164 represents an alkyl group having 2 to 5 carbon atoms, R 165 represents an alkyl group or an alkoxy group having 1 to 5 carbon atoms, each of X 161 and X 162 independently represents a hydrogen atom or a fluorine atom, A 16 represents a 1,4-phenylene group or a 1,4-cyclohexylene group, and m 16 represents 0 or 1).
6. A liquid crystal display element for active matrix driving using the liquid crystal composition according to claim 1 .