Nematic liquid crystal composition and liquid crystal display element using same
A liquid crystal composition of the present invention is used for a liquid crystal display device of an active matrix driving method, which requires fast response. The liquid crystal composition has negative dielectric anisotropy and a large absolute value thereof, and low viscosity. The liquid crystal composition is chemically stable to heat, light, water, and the like, and is suitable as a liquid crystal composition capable of low-voltage driving and practicable and having high reliability. A liquid crystal display device using the liquid crystal composition can be preferably used for a liquid crystal display device of a VA mode, a PASV mode, a PSA mode, or the like.
1. A liquid crystal composition comprising;
as a first component, one or two or more compounds selected from a compound group represented by general formula (I),
where R 11 and R 12 each independently represent an alkyl group having 1 to 10 carbon atoms, an alkoxyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkenyloxy group having 2 to 10 carbon atoms, one —CH 2 — or two or more nonadjacent —CH 2 — present in R 11 and R 12 may be each independently substituted by —O— and/or —S—, one or two or more hydrogen atoms present in R 11 and R 12 may be independently substituted by a fluorine atom or a chlorine atom, and p represents 0 or 1; and
as a second component, a compound group represented by general formula (II-E):
where R 21 and R 22 each independently represent an alkyl group having 1 to 10 carbon atoms, or an alkenyl group having 2 to 10 carbon atoms, and one or two or more hydrogen atoms present in R 21 and R 22 may be each independently substituted by a fluorine atom or a chlorine atom,
as a third component, a compounds represented by general formula (III-H),
where R 31 and R 32 each independently represent an alkyl group having 1 to 10 carbon atoms, an alkoxyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkenyloxy group having 2 to 10 carbon atoms.
2. The liquid crystal composition according to claim 1 , wherein as the second component, the liquid crystal composition further comprises one or two or more compounds selected from a compound group represented by general formula (II-A) to general formula (II-D), and general formula (II-F) to general formula (II-H),
where R 21 and R 22 each independently represent an alkyl group having 1 to 10 carbon atoms, an alkoxyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkenyloxy group having 2 to 10 carbon atoms, one —CH 2 — or two or more nonadjacent —CH 2 —present in R 11 and R 12 may be each independently substituted by —O— and/or —S—, and one or two or more hydrogen atoms present in R 21 and R 22 may be each independently substituted by a fluorine atom or a chlorine atom.
3. The liquid crystal composition according to claim 1 , wherein the content of the first component is 5% to 60% by mass, and the content of the second component is 2% to 30% by mass.
4. The liquid crystal composition according to claim 1 , wherein as the third component, the liquid crystal composition further comprises one or two or more compounds selected from a compound group represented by general formula (III-A) to general formula (III-G), and general formula (III-I) and general formula (III-J),
where R 31 and R 32 each independently represent an alkyl group having 1 to 10 carbon atoms, an alkoxyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkenyloxy group having 2 to 10 carbon atoms.
5. The liquid crystal composition according to claim 1 , wherein the content of the third component is 10% to 90% by mass.
6. The liquid crystal composition according to claim 1 , wherein dielectric anisotropy Δ∈ at 25° C. is within a range of −2.0 to −6.0, refractive index anisotropy Δn at 25° C. is within a range of 0.08 to 0.13, and a nematic-isotropic liquid phase transition temperature (Tni) is within a range of 60° C. to 120° C.
7. The liquid crystal composition according to claim 1 , comprising a polymerizable compound.
8. The liquid crystal composition according to claim 7 , wherein the polymerizable compound is a compound represented by general formula (IV),
where R 41 and R 42 each independently represent any one of formula (R-1) to formula (R-15) below,
X 1 to X 12 each independently represent a trifluoromethyl group, a trifluoromethoxy group, a fluorine atom, a hydrogen atom, or an alkyl group having 1 to 3 carbon atoms, and q represents 0 or 1.
9. A liquid crystal display device comprising the liquid crystal composition according to claim 1 .
10. A liquid crystal display device for active matrix driving, comprising the liquid crystal composition according to claim 1 .
11. A liquid crystal display device for a VA mode, a PSA mode, a PSVA mode, an IPS mode, or an ECB mode, the liquid crystal display device comprising the liquid crystal composition according to claim 1 .