Nematic liquid crystal composition, liquid crystal display element using same
A nematic liquid crystal composition according to the invention is used for a liquid crystal display element for an active matrix drive for TV applications or the like for which a quick switching and a wide viewing angle are required. The liquid crystal composition has a negative dielectric anisotropy having a large absolute value and also has a sufficiently low viscosity. Therefore, the liquid crystal composition has excellent characteristic properties, that is, a quick switching, good display quality and a suppressed display defect, and is therefore suitable as a practical liquid crystal composition. Further, a liquid crystal display element produced using the liquid crystal composition can be used favorably as a liquid crystal display element of a VA type or the like.
1. A liquid crystal composition comprising:
a first compound represented by formula (I) with a content of 5% to 25%,
a second compound having a negative dielectric anisotropy (Δ∈) with an absolute value of greater than 3 and a content of 20% to 80% by mass, containing at least one compound represented by formula (II-1A):
and one or more of compounds selected from a group of compounds represented by formulas (II-1B), and (II-2A):
wherein R 3 and R 4 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 3 and R 4 may be each independently substituted with a fluorine atom or a chlorine atom;
wherein Δ∈ at 25° C. is in a range of −2.0 to −6.0, a refractive index anisotropy (Δn) at 25° C. is in a range of 0.08 to 0.13, viscosity (η) at 20° C. is in a range of 10 to 30 mPa·s, and a nematic phase-isotropic liquid phase transition temperature (T ni ) is in a range of 60° C. to 120° C.
2. The liquid crystal composition according to claim 1 further comprising: a third compound, which is one or more of compounds selected from a group of compounds represented by formula (III-A) to formula (III-J):
wherein, R 5 represents an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms and R 6 represents an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkenyloxy group having 2 to 5 carbon atoms, with the proviso that, cases in which R 5 is a methyl group and R 6 is a propyl group, and in which R 5 is a propyl group and R 6 is a methyl group in formula (III-F) are excluded.
3. The liquid crystal composition according to claim 2 , wherein the liquid crystal composition comprises formula (I), formulas (II-1A), (II-2A), and formula (III-A).
4. The liquid crystal composition according to claim 2 , wherein the liquid crystal composition comprises formula (I), formulas (II-1A), (II-1B), (II-2A), and formula (III-A).
5. The liquid crystal composition according to claim 1 , wherein
the second compound having a chlorine group is less than 10% of the liquid crystal composition.
6. The liquid crystal composition according to claim 1 , wherein at least one of R 3 or R 4 is the alkenyl group having 2 to 10 carbon atoms; and,
the second compound comprising the alkenyl group having 2 to 10 carbon is less than 10% of the liquid crystal composition.
7. The liquid crystal composition according to claim 1 additionally comprising a polymerizable compound.
8. A liquid crystal display element using the liquid crystal composition described in claim 1 .
9. A liquid crystal display element for an active matrix drive using the liquid crystal composition described in claim 1 .
10. A liquid crystal display element for a VA mode, a PSA mode, a PSVA mode, an IPS mode, or an ECB mode using the liquid crystal composition described in claim 1 .