WO2017010346A1 - Liquid crystal composition and liquid crystal display element using same - Google Patents

Abstract

Provided are: a liquid crystal composition that contains one or more compounds represented by general formula (a) and one or more compounds represented by general formula (ii), that does not cause a reduction in the refractive index anisotropy (Δn) and in the nematic phase - isotropic liquid phase transition temperature (Tni), that has a sufficiently low viscosity (η), that has a sufficiently low rotation viscosity (γ1), that cancels or suppresses flickering from occurring, and that has a negative dielectric anisotropy (Δε) of which the absolute value is high; and an excellent display-quality liquid crystal display element that uses the composition, and having a high response speed and being free of, or suppressing malfunction in display such as drop marks, image sticking (IS), or unevenness in display, etc.

Description

Liquid crystal composition and liquid crystal display device using the same

The present invention relates to a liquid crystal composition and a liquid crystal display element that are useful as components for liquid crystal display devices and the like.

Liquid crystal display elements are used in various electric appliances for home use, measuring instruments, automobile panels, word processors, electronic notebooks, printers, computers, televisions, etc., including watches and calculators. Typical liquid crystal display methods include TN (twisted nematic), STN (super twisted nematic), DS (dynamic light scattering), GH (guest / host), and IPS (in-plane switching). Type, FFS type (fringe field switching) type, OCB (optical compensation birefringence) type, ECB (voltage controlled birefringence) type, VA (vertical alignment) type, CSH (color super homeotropic) type or FLC (ferroelectric) Liquid crystal).

Among these, as liquid crystal displays for smartphones and tablets, IPS type having high quality and excellent visual characteristics and FFS type liquid crystal display elements which are one type thereof are widely used. In particular, an FFS display device using a liquid crystal material in which Δε has a negative value can obtain high transmittance, and thus has been actively developed in recent years.

The IPS type and FFS type are transverse electric field types that use an electric field generated in the horizontal direction with respect to the substrate surface, but a strong electric field is likely to be generated at the edge portion of the transparent electrode, and accordingly, flexopolarization of the liquid crystal occurs. As a result, the display flickers and the transmittance decreases.

In recent years, liquid crystal driving elements using an oxide semiconductor such as IGZO capable of reducing the refresh frequency compared to conventional active driving have been actively developed in order to demand further power saving. The driving method for reducing the refresh frequency is more likely to cause flicker than the conventional 60 Hz driving method, and the display quality and transmittance are significantly reduced. Therefore, in addition to the high-speed response and high reliability usually required for liquid crystal compositions used for televisions and the like, there is a need for liquid crystal compositions that reduce the occurrence of flicker and decrease in transmittance.
On the other hand, as a liquid crystal material having a negative Δε and a large absolute value, for example, a liquid crystal composition using the following compound (A), compound (B), compound (C) and the like is known (Patent Document 1). However, development of a liquid crystal composition capable of suppressing the occurrence of flicker has been demanded.

In view of the above, there is a demand for a liquid crystal composition having a small rotational viscosity (γ1) of the liquid crystal composition and free from flicker, and a liquid crystal display device using the liquid crystal display device has a high response speed, dripping marks and image sticking. There has been a demand for a display with excellent display quality free from display defects such as (IS) and display unevenness.

International Publication No. 2010/084823

The problem to be solved by the present invention is that the viscosity (η) is sufficiently small without reducing the refractive index anisotropy (Δn) and the nematic phase-isotropic liquid phase transition temperature (Tni), and the rotational viscosity ( Provided is a liquid crystal composition having a negative dielectric anisotropy (Δε) having a large absolute value, in which γ ₁ ) is sufficiently small and occurrence of flicker is suppressed or eliminated, and a response speed using the same It is an object of the present invention to provide a liquid crystal display element having excellent display quality that is fast and free from display defects such as dripping marks, image sticking (IS), and display unevenness.

In order to solve the above-mentioned problems, the present inventors have studied the constitution of various liquid crystal compositions, found that the problems can be solved by using a specific liquid crystal compound, and completed the present invention. .

The present invention has the general formula (a)

(Wherein R ^a1 and R ^a2 each independently represents an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms, and one —CH ₂ — or Two or more non-adjacent —CH ₂ — may be each independently substituted with —O— or —S—, and one or more hydrogen atoms present in the group are each May be independently substituted with a fluorine atom or a chlorine atom,
M ^a1 is (b) a 1,4-phenylene group (one —CH═ present in the group or two or more non-adjacent —CH═ may be replaced by —N═) and (C) Naphthalene-2,6-diyl group (one —CH═ present in this group or two or more non-adjacent —CH═ may be replaced by —N═)
The group (b) and the group (c) are each independently substituted with a cyano group, a fluorine atom or a chlorine atom,
Z ^a1 is a single bond, —CH═CH—, —C≡C—, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —COO—, —OCO—, —OCH ₂ —, —CH ₂ O —, —OCF ₂ — or —CF ₂ O—, wherein one or more Z ^a1 represents —CH ₂ CH ₂ —,
m ^a1 represents 1, 2 or 3, and when M ^a1 and a plurality of Z ^a1 are present, they may be the same or different. )
And one or more compounds represented by
Formula (ii)

(In the formula, R ⁱⁱ¹ and R ⁱⁱ² each independently represent an alkyl group having 1 to 10 carbon atoms, and one or non-adjacent two or more —CH ₂ — in the alkyl group is directly bonded to an oxygen atom. Substituted with —O—, —S—, —CH═CH—, —CO—, —OCO—, —COO—, —C≡C—, —CF ₂ O— or —OCF ₂ — so that they are not adjacent. You can.)
A liquid crystal composition containing one or more compounds represented by the formula:

The liquid crystal composition of the present invention has a sufficiently small viscosity (η) and a rotational viscosity (γ ₁ ) without lowering the refractive index anisotropy (Δn) and the nematic phase-isotropic liquid phase transition temperature (Tni). ) Is sufficiently small, the occurrence of flicker is suppressed or eliminated, and has a negative dielectric anisotropy (Δε) having a large absolute value, and an IPS type or FFS type liquid crystal display element using the same Has a high response speed and is excellent in display quality with no or no display defects such as dripping marks, image sticking (IS) or display unevenness.

The figure which shows typically an example of a structure of the liquid crystal display element of this invention. The top view which expanded the area | region enclosed with the II line of the electrode layer 3 formed on the board | substrate 2 in FIG. FIG. 2 is a cross-sectional view of the liquid crystal display element shown in FIG. 1 taken along the line III-III in FIG. The figure which shows typically the orientation direction of the liquid crystal induced by the orientation film 4 The top view which expanded the other example of the area | region enclosed by the II line of the electrode layer 3 formed on the board | substrate 2 in FIG. Sectional drawing of the other example which cut | disconnected the liquid crystal display element shown in FIG. 1 in the III-III line direction in FIG. An enlarged plan view of the electrode configuration of a liquid crystal display element

The liquid crystal composition of the present invention contains one or more compounds represented by the general formula (a).

The compound represented by the general formula (a) is preferably a compound having a negative Δε and an absolute value larger than 3.

In the general formula (a), R ^a1 is an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, or an alkenyloxy group having 2 to 8 carbon atoms. Preferred is 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, and has 1 carbon atom. More preferably an alkyl group having 5 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, more preferably an alkyl group having 1 to 3 carbon atoms or an alkenyl group having 3 to 5 carbon atoms, and an alkyl group having 1 carbon atom ( Methyl group), an alkyl group having 2 carbon atoms (ethyl group), an alkyl group having 3 carbon atoms (propyl group), an alkenyl group having 4 carbon atoms (butenyl group), or an alkenyl group having 5 carbon atoms (pen Tenenyl group) is particularly preferable, and it is preferably linear. R ^a2 is preferably an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, or an alkenyloxy group having 2 to 8 carbon atoms. An alkyl group having 5 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 is preferable, and an alkoxy group having 1 to 4 carbon atoms is more preferable. Preferably, it is linear.

The alkenyl group is preferably selected from groups represented by any one of formulas (R1) to (R9), and particularly preferably formula (R8) or formula (R9). (The black spot in each formula represents a carbon atom in the ring structure to which R ^a1 or R ^a2 is bonded.)

The alkenyloxy group is preferably selected from groups represented by any of the formulas (OR1) to (OR9), and particularly preferably the formula (OR6), the formula (OR8) or the formula (OR9). (The black spot in each formula represents a carbon atom in the ring structure to which R ^a1 or R ^a2 is bonded.)

At least one of Z ^a1 represents —CH ₂ CH ₂ —. When m ^a1 represents 2 or 3, a plurality of Z ^a1 preferably represents a single bond or —CH ₂ CH ₂ —, and one Z ^a1 represents —CH ₂ CH ₂ —, and the remaining one or It is preferable that two Z ^a1 represent a single bond.

M ^a1 represents a 1,4-phenylene group or a naphthalene-2,6-diyl group, and when one hydrogen atom present in these groups is independently substituted with a fluorine atom or a chlorine atom, It is preferable to represent the following structure.

One or more M ^a1 is preferably an unsubstituted 1,4-phenylene group or an unsubstituted naphthalene-2,6-diyl ^group, all the ^{M a1} case ^{where M a1} there are multiple More preferably, it represents an unsubstituted 1,4-phenylene group or an unsubstituted naphthalene-2,6-diyl group. ^Further, preferably represents one or two or more 1,4-phenylene group ^{M a1, M a1} it is more preferable that represents the case where there are a plurality every ^{M a1} is 1,4-phenylene group.

m ^a1 preferably represents 1 or 2.
The liquid crystal composition of the present invention preferably contains a compound having m ^a1 of 1.
The liquid crystal composition of the present invention preferably contains a compound having m ^a1 of 2.

The liquid crystal composition of the present invention particularly preferably contains a compound having m ^a1 of 1 and a compound having m ^a1 of 2 simultaneously.

The compound represented by the general formula (a) is preferably a compound represented by the following general formula (a1).

( ^Wherein X ^a1 and X ^a2 each independently represents a hydrogen atom or a fluorine atom, at least one of X ^a1 and X ^a2 represents a hydrogen atom, and R ^a1 , R ^a2 , Z ^a1 and m ^a1 Each independently represents the same meaning as R ^a1 , R ^a2 , Z ^a1 and m ^a1 in formula (a).
X ^a1 and X ^a2 are more preferably hydrogen atoms.

Further, the compound represented by the general formula (a1) is preferably a compound represented by the general formula (a11).

(In the formula, R ^a3 represents an alkyl group having 1 to 8 carbon atoms, and X ^a1 and X ^a2 each independently represent a hydrogen atom or a fluorine atom, but at least one of X ^a1 and X ^a2 is hydrogen. R ^a1 , R ^a2 , Z ^a1 and m ^a1 each independently represent the same meaning as R ^a1 , R ^a2 , Z ^a1 and m ^a1 in the general formula (a).
It is preferable to contain 1 type, or 2 or more types of compounds represented by these.

Further, the compound represented by the general formula (a) is preferably a compound represented by the following general formula (a2).

(In the formula, M ^a21 and M ^a22 each independently represent a 1,4-phenylene group or a naphthalene-2,6-diyl group, and one hydrogen atom present in the group is each independently fluorine. Z ^a2 is a single bond, —CH═CH—, —C≡C—, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —COO—, —OCO -, -OCH _2- , -CH ₂ O-, -OCF ₂ -or -CF ₂ O-, m ⁱ¹ represents 0 or 1, and R ^a1 and R ^a2 each independently represent the general formula (a) Represents the same meaning as R ^a1 and R ^{a2 in FIG} .
More specifically, the compound represented by the general formula (a) preferably contains one or more compounds represented by the following general formulas (a-1) to (a-10).

(In the formula, R ^a1 and R ^a2 each independently represent the same meaning as R ^a1 and R ^a2 in the general formula (a).)
The liquid crystal composition of the present invention contains one or more compounds represented by the general formula (a), but preferably contains 2 to 10 compounds.

The liquid crystal composition of the present invention preferably contains one or more compounds represented by the general formula (a-1).

The liquid crystal composition of the present invention preferably contains one or more compounds represented by the general formula (a-3).

The liquid crystal composition of the present invention preferably contains one or more compounds represented by the general formula (a-7).

The liquid crystal composition of the present invention contains one or more compounds represented by general formula (a-1) and one or more compounds represented by general formula (a-3). More preferably.

The liquid crystal composition of the present invention contains one or more compounds represented by general formula (a-3) and one or more compounds represented by general formula (a-7). More preferably.

The liquid crystal composition of the present invention contains one or more compounds represented by general formula (a-1) and one or more compounds represented by general formula (a-7). It is preferable.

The total amount of the compound represented by the general formula (a) is preferably 0.1% by mass or less (hereinafter,% in the composition represents% by mass) as a lower limit in the composition. 0.5% or more, preferably 1% or more, preferably 3% or more, preferably 4% or more, preferably 5% or more, 7% It is preferable to contain 10% or more, preferably 13% or more, preferably 15% or more, preferably 18% or more, and 20% or more. Preferably, it contains 23% or more, preferably contains 25% or more, preferably contains 28% or more, preferably contains 30% or more, contains 33% or more It is preferred, is preferably contained 35% or more, preferably it contains more than 38%, it is preferable to contain 40% or more. Further, the upper limit is preferably 70% or less, preferably 68% or less, preferably 65% or less, preferably 63% or less, and preferably 60% or less. 55% or less, preferably 50% or less, preferably 40% or less, preferably 38% or less, preferably 35% or less, 33% or less Preferably 30% or less, preferably 28% or less, preferably 25% or less, preferably 23% or less, preferably 20% or less, It is preferable to contain 18% or less, preferably 15% or less, and preferably 10% or less.

The liquid crystal composition of the present invention contains one or more compounds represented by the general formula (ii).

R ⁱⁱ¹ and R ⁱⁱ² are each independently a linear alkyl group having 1 to 10 carbon atoms, a linear alkoxy group having 1 to 9 carbon atoms and a linear group in order to reduce the viscosity. An alkenyl group having 2 to 10 carbon atoms is preferable, a linear alkyl group having 1 to 8 carbon atoms, a linear alkoxy group having 1 to 7 carbon atoms, and a straight chain carbon number of 2 to 8 And a straight-chain alkyl group having 1 to 5 carbon atoms, a straight-chain alkoxy group having 1 to 4 carbon atoms, and a straight-chain alkenyl group having 2 to 5 carbon atoms are preferable.

Either one or both of R ⁱⁱ¹ and R ⁱⁱ² is preferably a straight chain alkenyl group having 2 to 8 carbon atoms, and preferably a straight chain alkenyl group having 2 to 5 carbon atoms. More preferred. ^{More preferably} , one of R ⁱⁱ¹ and R ^{ii2 represents} a linear alkenyl group having 2 to 5 carbon atoms, and the other represents a linear alkyl group having 1 to 5 carbon atoms.

The compound represented by the general formula (ii) can be used alone, or two or more compounds can be used in combination. There are no particular restrictions on the types of compounds that can be combined, but they are used in appropriate combinations according to the required properties such as solubility at low temperatures, transition temperatures, electrical reliability, and birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention, two kinds, three kinds, four kinds, and five kinds or more. The lower limit of the preferable content is 1%, 2%, 3%, 5%, 7%, 10%, and 13% with respect to the total amount of the composition of the present invention. %, 15%, 18%, 20%, 21%, 23%, 25%, 28%, 30%, 35%, 36% %, 37%, 38%, 39%, 40%, 45%, 50%, 55%. The upper limit of the preferable content is 95%, 90%, 85%, 80%, 75%, 70%, 65%, based on the total amount of the composition of the present invention. %, 60%, 55%, 50%, 45%, 40%, 35%, 32%, 30%, 28%, 25% %, 23%, and 20%.

When the viscosity of the composition of the present invention is kept low and a composition having a high response speed is required, the above lower limit value is preferably high and the upper limit value is preferably high. Furthermore, when the composition of the present invention requires a high Tni and a composition having good temperature stability, it is preferable that the lower limit value is moderate and the upper limit value is moderate. When it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable that the lower limit value is low and the upper limit value is low.

The compound represented by the general formula (ii) is preferably a compound represented by the general formula (ii-1).

^{(Wherein, R ii11} represents a hydrogen atom or a methyl ^{group, R ii2} has the same meaning as ^{R ii2} in the general formula (ii).)
The lower limit of the preferable content of the compound represented by the formula (ii-1) with respect to the total amount of the composition of the present invention is 1%, 5%, 10%, 15% 17%, 20%, 23%, 25%, 27%, 30%, 35%. The upper limit of the preferable content is 60%, 55%, 50%, 45%, 42%, 40%, and 38% with respect to the total amount of the composition of the present invention. %, 35%, 33%, and 30%.

The compound represented by the general formula (ii-1) is preferably a compound selected from the group consisting of compounds represented by the formulas (ii-1.11) to (ii-1.13). -1.12) or a compound represented by formula (ii-1.13) is preferred, and a compound represented by formula (ii-1.13) is particularly preferred.

The lower limit of the preferred content of the compound represented by formula (ii-1.13) or formula (ii-1.12) with respect to the total amount of the composition of the present invention is 1%, Yes, 3%, 5%, 7%, 10%, 13%, 15%. The upper limit of the preferable content is 30%, 25%, 20%, 15%, 13%, 10%, and 8% with respect to the total amount of the composition of the present invention. %, 7%, 6%, 5%, 3%.

Further, the compound represented by the general formula (ii-1) is preferably a compound selected from the group of compounds represented by the formulas (ii-1.21) to (ii-1.24). The compound represented by formula (ii-1.24) to (ii-1.22) is preferable. In particular, the compound represented by formula (ii-1.22) is preferable because the response speed of the composition of the present invention is particularly improved. When obtaining Tni higher than the response speed, it is preferable to use a compound represented by the formula (ii-1.23) or the formula (ii-1.24). The content of the compounds represented by formula (ii-1.23) and formula (ii-1.24) is not preferably 30% or more in order to improve solubility at low temperatures.

The lower limit of the preferable content of the compound represented by formula (ii-1.22) with respect to the total amount of the composition of the present invention is 10%, 15%, 16%, 17% 18%, 20%, 21%, 22%, 23%, 25%, 27%, 30%, 33%, 35% 38% and 40%. The upper limit of the preferable content is 60%, 55%, 50%, 45%, 43%, 40%, and 38% with respect to the total amount of the composition of the present invention. %, 35%, 32%, 30%, 27%, 25%, and 22%.

In addition, the compound represented by the general formula (ii-1) is preferably a compound selected from the compound group represented by the formula (ii-1.31) and the formula (ii-1.41).

The liquid crystal composition of the present invention particularly preferably contains a compound represented by formula (ii-1.4.1).

It a compound represented by the general formula (ii-1) may contain at least one or more compounds ^{R Ii11} represents a hydrogen atom in the general formula (ii-1) and ^{R Ii11} of compounds represents a methyl group One or more of each may be contained. More specifically, in order to obtain a low viscosity or a low rotational viscosity, it is preferable that R ⁱⁱ¹¹ contains more compounds in which a hydrogen atom is represented, and in order to obtain a large elastic constant, a compound in which R ⁱⁱ¹¹ represents a methyl group. In order to obtain a liquid crystal display element having a high response speed, it is preferable to contain as much of these as possible.

The composition of the present invention preferably contains a compound represented by the formula (ii-1.13) and a compound represented by the formula (ii-1.22), and is based on the total amount of the composition of the present invention. The lower limit value of the total content of all the compounds represented by the formula (ii-1.13) and the compound represented by the formula (ii-1.22) is 10%, 15%, 20%, 25%, 27%, 30%, 33%, 35%, 37%, and 40%. The upper limit of the preferable content is 60%, 55%, 50%, 45%, 43%, 40%, and 38% with respect to the total amount of the composition of the present invention. %, 35%, 32%, 30%, 27%, 25%, and 22%.

The compound represented by the general formula (ii) is preferably a compound selected from the group of compounds represented by the general formula (ii-2).

( ^Wherein R ⁱⁱ²¹ and R ⁱⁱ²² each independently represents an alkyl group having 1 to 8 carbon atoms or an alkoxy group having 1 to 8 carbon atoms)
R ⁱⁱ²¹ and R ⁱⁱ²² are preferably a linear alkyl group having 1 to 5 carbon atoms and a linear alkoxy group having 1 to 4 carbon atoms.

The lower limit of the preferable content of the compound represented by formula (ii-2) with respect to the total amount of the composition of the present invention is 1%, 5%, 10%, 13% 15%, 17%, 20%, 23%, 25%, 30%, and the preferable upper limit of the content is 60%, 55%, 50% %, 45%, 40%, 37%, 35%, 33%, 30%, 27%, 25%, 23%, 20% %, 17%, 15%, 13%, and 10%.

Further, the compound represented by the general formula (ii-2) is preferably a compound selected from the group of compounds represented by the formula (ii-2.1) to the formula (ii-2.12) A compound represented by (ii-2.1), formula (ii-2.3) or formula (ii-2.4) is preferable. In particular, the compound represented by formula (ii-2.1) is preferable because the response speed of the composition of the present invention is particularly improved. Further, when obtaining Tni higher than the response speed, it is expressed by the equations (ii-2.3), (ii-2.4), (ii-2.11), and (ii-2.12). It is preferable to use the compound. The total content of the compounds represented by formula (ii-2.3), formula (ii-2.4), formula (ii-2.11) and formula (ii-2.12) is It is not preferable to make it 20% or more in order to improve solubility.

The lower limit of the preferable content of the compound represented by the formula (ii-2.1) with respect to the total amount of the composition of the present invention is 1%, 2%, 3%, 5% 7%, 10%, 13%, 15%, 18%, 20%. The upper limit of the preferable content is 20%, 17%, 15%, 13%, 10%, 8%, and 7% with respect to the total amount of the composition of the present invention. % And 6%.

The compound represented by the general formula (ii) is preferably a compound selected from the group of compounds represented by the general formula (ii-3) and / or (ii-4).

(In the formula, R ⁱⁱ³¹ and R ⁱⁱ⁴¹ each independently represent the same meaning as R ⁱⁱ² in general formula (ii).)
R ⁱⁱ³¹ and R ⁱⁱ³² are preferably a linear alkyl group having 1 to 5 carbon atoms, a linear alkoxy group having 1 to 4 carbon atoms, and a linear alkenyl group having 2 to 5 carbon atoms. .

The lower limit of the preferable content of the compound represented by the formula (ii-3) with respect to the total amount of the composition of the present invention is 1%, 5%, 10%, 13% 15%, 17%, and 20%. The upper limit of the preferable content is 25%, 23%, 20%, 17%, 15%, 13%, and 10% with respect to the total amount of the composition of the present invention. %.

The lower limit of the preferable content of the compound represented by the formula (ii-4) with respect to the total amount of the composition of the present invention is 1%, 5%, 10%, 13% 15%, 17%, and 20%. The upper limit of the preferable content is 25%, 23%, 20%, 17%, 15%, 13%, and 10% with respect to the total amount of the composition of the present invention. %.

Further, the compounds represented by the general formulas (ii-3) and (ii-4) are compounds selected from the group of compounds represented by the formulas (ii-3.1) to (ii-4.3). Preferably, it is a compound represented by formula (ii-3.2) or formula (ii-4.2).

The lower limit of the preferable content of the compound represented by the formula (ii-3.2) with respect to the total amount of the composition of the present invention is 1%, 2%, 3%, 5% 7%, 10%, 13%, 15%, 18%, 20%. The upper limit of the preferable content is 20%, 17%, 15%, 13%, 10%, 8%, and 7% with respect to the total amount of the composition of the present invention. % And 6%.

Formula (ii-1.13), Formula (ii-1.22), Formula (ii-2.1), Formula (ii-2.3), Formula (ii-2.4), Formula (ii-2) .11) and two or more compounds selected from the compounds represented by formula (ii-2.12) are preferably combined, and the compounds represented by formula (ii-1.13), formula (ii-1.22), formula Combining two or more compounds selected from compounds represented by (ii-2.1), formula (ii-2.3), formula (ii-2.4) and formula (ii-3.2) The lower limit of the preferred content of the total content of these compounds is 1%, 2%, 3%, 5% with respect to the total amount of the composition of the present invention, 7%, 10%, 13%, 15%, 18%, 20%, 23%, 25%, 2% %, 30%, 33%, 35%, and the upper limit is 80%, 70%, 60%, and 50% with respect to the total amount of the composition of the present invention. %, 45%, 40%, 37%, 35%, 33%, 30%, 28%, 25%, 23%, 20% %. When emphasizing the reliability of the composition, two or more selected from compounds represented by formula (ii-2.1), formula (ii-2.3) and formula (ii-2.4)) It is preferable to combine these compounds, and when importance is attached to the response speed of the composition, two or more compounds selected from the compounds represented by the formula (ii-1.13) and the formula (ii-1.22) Are preferably combined.

The liquid crystal composition of the present invention preferably further contains one or more compounds selected from the compound group represented by formulas (N-1) to (N-3).

(Wherein, R ^N11 , R ^N12 , R ^N21 , R ^N22 , R ^N31 and R ^N32 each independently represents an alkyl group having 1 to 8 carbon atoms, and one or non-adjacent 2 in the alkyl group _Two or more —CH ₂ — may be each independently substituted by —CH═CH—, —C≡C—, —O—, —CO—, —COO— or —OCO—,
A ^N11 , A ^N12 , A ^N21 , A ^N22 , A ^N31, and A ^N32 are each independently (a) a 1,4-cyclohexylene group (one —CH ₂ — or adjacent to each other in this group). And two or more —CH ₂ — may be replaced by —O—) and (b) a 1,4-phenylene group (one —CH═ present in this group or not adjacent 2 More than one -CH = may be replaced by -N =.)
(C) (c) Naphthalene-2,6-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or decahydronaphthalene-2,6-diyl group (naphthalene-2,6- One —CH═ present in a diyl group or 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or two or more non-adjacent —CH═ are replaced by —N═. Is also good.)
The group (a), the group (b) and the group (c) may be each independently substituted with a cyano group, a fluorine atom or a chlorine atom,
Z ^N11 , Z ^N12 , Z ^N21 , Z ^N22 , Z ^N31 and Z ^N32 are each independently a single bond, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —OCH ₂ —, —CH ₂ O—. , —COO—, —OCO—, —OCF ₂ —, —CF ₂ O—, —CH═N—N═CH—, —CH═CH—, —CF═CF— or —C≡C—,
^XN21 represents a hydrogen atom or a fluorine atom,
T ^N31 represents —CH ₂ — or an oxygen atom,
n ^N11 , n ^N12 , n ^N21 , n ^N22 , n ^N31, and n ^N32 each independently represent an integer of 0 to 3, but n ^N11 + n ^N12 , n ^N21 + n ^N22, and n ^N31 + n ^N32 are each independently When there are a plurality of A ^N11 to A ^N32 and Z ^N11 to Z ^N32 , they may be the same or different. However, in general formula (N-1) and general formula (N-2), the compound represented by general formula (a) is excluded, and in general formula (N-2) and general formula (N-3) The compound represented by the general formula (N-1) is excluded, and the compound represented by the general formula (N-1) in the general formula (N-3) is further excluded. )
The compounds represented by the general formulas (N-1), (N-2) and (N-3) are preferably compounds having a negative Δε and an absolute value larger than 3.

In the general formulas (N-1), (N-2) and (N-3), R ^N11 , R ^N12 , R ^N21 , R ^N22 , R ^N31 and R ^N32 each independently represent 1 to 8 carbon atoms. An alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, or an alkenyloxy group having 2 to 8 carbon atoms, preferably 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 is preferable, and an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms is preferable. More preferably, an alkyl group having 2 to 5 carbon atoms or an alkenyl group having 2 to 3 carbon atoms is more preferable, and an alkenyl group having 3 carbon atoms (propenyl group) is particularly preferable.

Further, when the ring structure to which it is bonded is a phenyl group (aromatic), a linear alkyl group having 1 to 5 carbon atoms, a linear alkoxy group having 1 to 4 carbon atoms and carbon An alkenyl group having 4 to 5 atoms is preferable, and when the ring structure to which the alkenyl group is bonded is a saturated ring structure such as cyclohexane, pyran and dioxane, a linear alkyl group having 1 to 5 carbon atoms, a straight chain A straight-chain alkoxy group having 1 to 4 carbon atoms and a straight-chain alkenyl group having 2 to 5 carbon atoms are preferred. In order to stabilize the nematic phase, the total of carbon atoms and oxygen atoms, if present, is preferably 5 or less, and is preferably linear.

The alkenyl group is preferably selected from groups represented by any of the formulas (R1) to (R9). (The black dots in each formula represent carbon atoms in the ring structure.)

A ^N11 , A ^N12 , A ^N21 , A ^N22 , A ^N31, and A ^N32 are preferably aromatic when it is required to increase Δn independently, and in order to improve the response speed, fat Preferably a trans-1,4-cyclohexylene group, 1,4-phenylene group, 2-fluoro-1,4-phenylene group, 3-fluoro-1,4-phenylene group, 3,5 -Difluoro-1,4-phenylene group, 2,3-difluoro-1,4-phenylene group, 1,4-cyclohexenylene group, 1,4-bicyclo [2.2.2] octylene group, piperidine-1 , 4-diyl group, naphthalene-2,6-diyl group, decahydronaphthalene-2,6-diyl group or 1,2,3,4-tetrahydronaphthalene-2,6-diyl group Preferred, it is more preferable that represents the following structures,

More preferably, it represents a trans-1,4-cyclohexylene group or a 1,4-phenylene group.

^{Z N11, Z N12, Z N21} , Z N22, Z N31 and ^{Z N32} _-CH 2 each _{independently O -, - CF 2 O -} , - CH 2 CH 2 -, - CF 2 CF 2 - or a single bond preferably represents _{an, -CH 2 O -, - CH} 2 CH 2 - or a single bond is more preferable, _-CH 2 O-or a single bond is particularly preferred.

^XN21 is preferably a fluorine atom.

T ^N31 is preferably an oxygen atom.

n ^N11 + n ^N12 , n ^N21 + n ^N22 and n ^N31 + n ^N32 are preferably 1 or 2, a combination in which n ^N11 is 1 and n ^N12 is 0, a combination in which n ^N11 is 2 and n ^N12 is 0, n ^A combination in which ^N11 is 1 and n ^N12 is 1, a combination in which n ^N11 is 2 and n ^N12 is 1, a combination in which n ^N21 is 1 and n ^N22 is 0, n ^N21 is 2 and n ^N22 is n A combination in which n ^N31 is 1 and n ^N32 is 0, and a combination in which n ^N31 is 2 and n ^N32 is 0 are preferable.

The total content of the compounds represented by the formulas (N-1) to (N-3) with respect to the total amount of the composition of the present invention is 3% by mass to 100% by mass in the liquid crystal composition. preferable. More specifically, the lower limit of the preferable content of the compound selected from formula (N-1) to formula (N-3) with respect to the total amount of the composition of the present invention is 1%, %, 10%, 20%, 30%, 40%, 50%, 55%, 60%, 65%, 70%, 75 % And 80%. The upper limit of the preferred content is 95%, 85%, 75%, 65%, 55%, 50%, 45%, 35%, 25% And 20%.

The lower limit of the preferable content of the compound represented by the formula (N-1) with respect to the total amount of the composition of the present invention is 1%, 10%, 20%, 30% , 40%, 50%, 55%, 60%, 65%, 70%, 75%, and 80%. The upper limit of the preferred content is 95%, 85%, 75%, 65%, 55%, 45%, 35%, 25%, 20% It is.

The lower limit of the preferable content of the compound represented by the formula (N-2) with respect to the total amount of the composition of the present invention is 1%, 10%, 20%, 30% , 40%, 50%, 55%, 60%, 65%, 70%, 75%, and 80%. The upper limit of the preferred content is 95%, 85%, 75%, 65%, 55%, 45%, 35%, 25%, 20% It is.

The lower limit of the preferable content of the compound represented by the formula (N-3) with respect to the total amount of the composition of the present invention is 1%, 10%, 20%, 30% , 40%, 50%, 55%, 60%, 65%, 70%, 75%, and 80%. The upper limit of the preferred content is 95%, 85%, 75%, 65%, 55%, 45%, 35%, 25%, 20% It is.

When the viscosity of the composition of the present invention is kept low and a composition having a high response speed is required, the above lower limit value is preferably low and the upper limit value is preferably low. Furthermore, when the composition of the present invention keeps Tni high and a composition having good temperature stability is required, the above lower limit value is preferably low and the upper limit value is preferably low. When it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable that the above lower limit value is increased and the upper limit value is high.

It is preferable that the compound represented by the general formula (N-1) contains one or more compounds represented by the general formula (Ni).

( ^Wherein R ^Ni1 and R ^Ni2 each independently represent an alkyl group having 1 to 8 carbon atoms or an alkenyl group having 2 to 10 carbon atoms, and one or more —CH _{2 in the group)} -Or two or more non-adjacent —CH ₂ — may be each independently substituted with —O— or —S—, and one or more hydrogen atoms present in the group Each independently may be substituted with a fluorine atom or a chlorine atom, and A ^Ni1 and A ^Ni2 are each independently (a) a 1,4-cyclohexylene group (one —CH ₂ present in this group). Or two or more non-adjacent —CH ₂ — may be replaced by —O—.
(B) a 1,4-phenylene group (one —CH═ present in the group or two or more non-adjacent —CH═ may be replaced by —N═) and (c) Naphthalene-2,6-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or decahydronaphthalene-2,6-diyl group (naphthalene-2,6-diyl group or 1,2 , 3,4-tetrahydronaphthalene-2,6-diyl, one —CH═ or two or more non-adjacent —CH═ may be replaced by —N═.
The group (a), the group (b) and the group (c) are each independently substituted with a cyano group, a fluorine atom or a chlorine atom, and m ^Ni1 is a group selected from the group consisting of 1 represents an integer of 1 to 3, m ^Ni2 represents an integer of 0 to 3, m ^Ni1 + m ^Ni2 is 1, 2 or 3, and when a plurality of A ^Ni1 and A ^Ni2 are present, they are the same May be different. )
m ^Ni1 is 1 or ^{2, m Ni @ 2} represents 0 or ^{1, m} Ni1 ⁺ m ^Ni2 is preferably 1 or 2. The liquid crystal composition of the present invention preferably contains one or more compounds represented by the general formula (Ni).

The compounds represented by the general formula (N-1) and the general formula (Ni) are compounds selected from the group of compounds represented by the general formulas (N-1-1) to (N-1-5). It is preferable.

The compound represented by the general formula (N-1-1) is the following compound.

( ^Wherein , R ^N111 and R ^N112 each independently represent the same meaning as R ^N11 and R ^N12 in formula (N-1)).
R ^N111 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and preferably a propyl group or a pentyl group. ^RN112 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and preferably an ethoxy group or a butoxy group.

The compound represented by the general formula (N-1-1) can be used alone, or two or more compounds can be used in combination. There are no particular restrictions on the types of compounds that can be combined, but they are used in appropriate combinations according to the required properties such as solubility at low temperatures, transition temperatures, electrical reliability, and birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention, two kinds, three kinds, four kinds, and five kinds or more.

It is preferable to set a higher content in the case of emphasizing improved [Delta] [epsilon], to emphasize the solubility at low temperature highly effective when larger amount to set the content, when importance is attached to T _NI content Setting to a small value is highly effective. Furthermore, when improving dripping marks and image sticking characteristics, it is preferable to set the content range in the middle.

The lower limit of the preferable content of the compound represented by the formula (N-1-1) with respect to the total amount of the composition of the present invention is 5%, 10%, 13%, 15% 17%, 20%, 23%, 25%, 27%, 30%, 33%, 35%. The upper limit of the preferable content is 50%, 40%, 38%, 35%, 33%, 30%, and 28% with respect to the total amount of the composition of the present invention. %, 25%, 23%, 20%, 18%, 15%, 13%, 10%, 8%, 7%, 6% %, 5%, 3%.

Further, the compound represented by the general formula (N-1-1) is a compound selected from the group of compounds represented by the formula (N-1-1.1) to the formula (N-1-1.14). Preferably, it is a compound represented by the formulas (N-1-1.1) to (N-1-1.4), and the formula (N-1-1.1) and the formula (N The compound represented by -1-1.3) is preferable.

The compounds represented by the formulas (N-1-1.1) to (N-1-1.4) can be used alone or in combination. The lower limit of the preferred content of these compounds alone or with respect to the total amount is 5%, 10%, 13%, 15%, 17%, 20%, 23% 25% 27% 30% 33% 35% The upper limit of the preferable content is 50%, 40%, 38%, 35%, 33%, 30%, and 28% with respect to the total amount of the composition of the present invention. %, 25%, 23%, 20%, 18%, 15%, 13%, 10%, 8%, 7%, 6% %, 5%, 3%.

The compound represented by the general formula (N-1-2) is the following compound.

(In the formula, R ^N121 and R ^N122 each independently represent the same meaning as R ^N11 and R ^N12 in formula (N-1)).
^RN121 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and preferably an ethyl group, a propyl group, a butyl group or a pentyl group. ^RN122 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and includes a methyl group, a propyl group, a methoxy group, an ethoxy group, or a propoxy group. preferable.

The compound represented by the general formula (N-1-2) can be used alone, or two or more compounds can be used in combination. There are no particular restrictions on the types of compounds that can be combined, but they are used in appropriate combinations according to the required properties such as solubility at low temperatures, transition temperatures, electrical reliability, and birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention, two kinds, three kinds, four kinds, and five kinds or more.

When emphasizing the improvement of Δε, it is preferable to set the content higher. When emphasizing the solubility at low temperature, it is more effective to set the content lower. When emphasizing T _NI , the content is preferable. Setting a large number of is highly effective. Furthermore, when improving dripping marks and image sticking characteristics, it is preferable to set the content range in the middle.

The lower limit of the preferable content of the compound represented by the formula (N-1-2) with respect to the total amount of the composition of the present invention is 5%, 7%, 10%, 13% 15%, 17%, 20%, 23%, 25%, 27%, 30%, 33%, 35%, 37% 40% and 42%. The upper limit of the preferable content is 50%, 48%, 45%, 43%, 40%, 38%, and 35% with respect to the total amount of the composition of the present invention. %, 33%, 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% %, 8%, 7%, 6%, 5%.

Further, the compound represented by the general formula (N-1-2) is a compound selected from the group of compounds represented by the formula (N-1-2.1) to the formula (N-1-2.13). Preferably, the formula (N-1-2.3) to the formula (N-1-2.7), the formula (N-1-2.10), the formula (N-1-2.11) and the formula The compound represented by (N-1-2.13) is preferable, and when importance is placed on the improvement of Δε, the formula (N-1-2.3) to the formula (N-1-2.7) in the compounds _represented, when emphasizing improvements in _{T NI} formula (N-1-2.10), formula (N-1-2.11) and formula (N-1-2.13) It is preferable that it is a compound represented by these.

The compounds represented by the formula (N-1-2.1) to the formula (N-1-2.13) can be used alone or in combination. The lower limit of the preferable content of these compounds alone or with respect to the total amount of is 5%, 10%, 13%, 15%, 17%, 20%, 23 %, 25%, 27%, 30%, 33%, and 35%. The upper limit of the preferable content is 50%, 40%, 38%, 35%, 33%, 30%, and 28% with respect to the total amount of the composition of the present invention. %, 25%, 23%, 20%, 18%, 15%, 13%, 10%, 8%, 7%, 6% %, 5%, 3%.

The compound represented by the general formula (N-1-3) is the following compound.

( ^Wherein , R ^N131 and R ^N132 each independently represent the same meaning as R ^N11 and R ^N12 in formula (N-1)).
R ^N131 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and preferably an ethyl group, a propyl group or a butyl group. R ^N132 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and preferably an ethoxy group, a propoxy group, or a butoxy group.

The compound represented by the general formula (N-1-3) can be used alone, or two or more compounds can be used in combination. There are no particular restrictions on the types of compounds that can be combined, but they are used in appropriate combinations according to the required properties such as solubility at low temperatures, transition temperatures, electrical reliability, and birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention, two kinds, three kinds, four kinds, and five kinds or more.

It is preferable to set a higher content in the case of emphasizing improved [Delta] [epsilon], to emphasize the solubility at low temperature highly effective when larger amount to set the content, when importance is attached to T _NI content Highly effective when set to. Furthermore, when improving dripping marks and image sticking characteristics, it is preferable to set the content range in the middle.

The lower limit of the preferable content of the compound represented by the formula (N-1-3) with respect to the total amount of the composition of the present invention is 5%, 10%, 13%, 15% 17% and 20%. The upper limit of the preferable content is 35%, 30%, 28%, 25%, 23%, 20%, and 18% with respect to the total amount of the composition of the present invention. %, 15%, and 13%.

Further, the compound represented by the general formula (N-1-3) is a compound selected from the group of compounds represented by the formula (N-1-3.1) to the formula (N-1-3.11). Preferably, it is a compound represented by the formulas (N-1-3.1) to (N-1-3.7), and the formula (N-1-3.1) and the formula (N -1-3.2), formula (N-1-3.3), formula (N-1-3.4) and compounds represented by formula (N-1-3.6) are preferred.

The compounds represented by formula (N-1-3.1) to formula (N-1-3.4) and formula (N-1-3.6) may be used alone or in combination. Is possible, but the combination of formula (N-1-3.1) and formula (N-1-3.2), formula (N-1-3.3), formula (N-1-3.4) ) And a combination of two or three selected from formula (N-1-3.6) are preferred. The lower limit of the preferred content of these compounds alone or with respect to the total amount of the composition of the present invention is 5%, 10%, 13%, 15%, 17%, 20% %. The upper limit of the preferable content is 35%, 30%, 28%, 25%, 23%, 20%, and 18% with respect to the total amount of the composition of the present invention. %, 15%, and 13%.

The compound represented by the general formula (N-1-4) is the following compound.

^{(Wherein, R N141} and ^{R N142} each independently represents the same meaning as ^{R N11} and ^{R N12} in the general formula (N-1).)
R ^N141 and ^{R N142} are each independently an alkyl group having 1 to 5 carbon atoms, an alkenyl group or an alkoxy group having 1 to 4 carbon atoms carbon atoms 4-5 preferably a methyl group, a propyl group, an ethoxy Group or butoxy group is preferred.

The compound represented by the general formula (N-1-4) can be used alone, or two or more compounds can be used in combination. There are no particular restrictions on the types of compounds that can be combined, but they are used in appropriate combinations according to the required properties such as solubility at low temperatures, transition temperatures, electrical reliability, and birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention, two kinds, three kinds, four kinds, and five kinds or more.

It is preferable to set a higher content in the case of emphasizing improved [Delta] [epsilon], to emphasize the solubility at low temperature highly effective when larger amount to set the content, when importance is attached to T _NI content Setting to a small value is highly effective. Furthermore, when improving dripping marks and image sticking characteristics, it is preferable to set the content range in the middle.

The lower limit of the preferable content of the compound represented by the formula (N-1-4) with respect to the total amount of the composition of the present invention is 3%, 5%, 7%, 10% 13%, 15%, 17%, 20%. The upper limit of the preferable content is 35%, 30%, 28%, 25%, 23%, 20%, and 18% with respect to the total amount of the composition of the present invention. %, 15%, 13%, 11%, 10%, and 8%.

Further, the compound represented by the general formula (N-1-4) is a compound selected from the group of compounds represented by the formula (N-1-4.1) to the formula (N-1-4.14). Preferably, it is a compound represented by the formulas (N-1-4.1) to (N-1-4.4), and the formula (N-1-4.1) and the formula (N The compound represented by -1-4.2) is preferable.

The compounds represented by formulas (N-1-4.1) to (N-1-4.4) can be used singly or in combination, but the compounds of the present invention The lower limit of the preferable content of these compounds alone or with respect to the total amount is 3%, 5%, 7%, 10%, 13%, 15%, 17% And 20%. The upper limit of the preferable content is 35%, 30%, 28%, 25%, 23%, 20%, and 18% with respect to the total amount of the composition of the present invention. %, 15%, 13%, 11%, 10%, and 8%.

The compound represented by the general formula (N-1-5) is the following compound.

(In the formula, R ^N151 and R ^N152 each independently represent the same meaning as R ^N11 and R ^N12 in formula (N-1).)
R ^N151 and R ^N152 are each independently an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and preferably an ethyl group, a propyl group, or a butyl group. Is preferred.

The compound represented by the general formula (N-1-5) can be used alone, or two or more compounds can be used in combination. There are no particular restrictions on the types of compounds that can be combined, but they are used in appropriate combinations according to the required properties such as solubility at low temperatures, transition temperatures, electrical reliability, and birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention, two kinds, three kinds, four kinds, and five kinds or more.

When emphasizing the improvement of Δε, it is preferable to set the content higher. When emphasizing the solubility at low temperature, it is more effective to set the content lower. When emphasizing T _NI , the content is preferable. Setting a large number of is highly effective. Furthermore, when improving dripping marks and image sticking characteristics, it is preferable to set the content range in the middle.

The lower limit of the preferable content of the compound represented by the formula (N-1-5) with respect to the total amount of the composition of the present invention is 5%, 8%, 10%, 13% 15%, 17%, 20%. The upper limit of the preferable content is 35%, 33%, 30%, 28%, 25%, 23%, and 20% with respect to the total amount of the composition of the present invention. %, 18%, 15% and 13%.

Further, the compound represented by the general formula (N-1-5) is a compound selected from the group of compounds represented by the formula (N-1-5.1) to the formula (N-1-5.6). It is preferable that a compound represented by the formula (N-1-3.2 and the formula (N-1-3.4) is preferable.

The compounds represented by formula (N-1-3.2) and formula (N-1-3.4) can be used alone or in combination, but the composition of the present invention The lower limit value of the preferred content of these compounds alone or with respect to the total amount of is 5%, 8%, 10%, 13%, 15%, 17%, 20% %. The upper limit of the preferable content is 35%, 33%, 30%, 28%, 25%, 23%, and 20% with respect to the total amount of the composition of the present invention. %, 18%, 15% and 13%.

The compound represented by the general formula (N-1) may be a compound selected from the group of compounds represented by the general formulas (N-1-10) to (N-1-21).

The compound represented by the general formula (N-1-10) is the following compound.

(In the formula, R ^N1101 and R ^N1102 each independently represent the same meaning as R ^N11 and R ^N12 in formula (N-1).)
R ^N1101 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and preferably an ethyl group, a propyl group or a butyl group. R ^N1102 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and preferably an ethoxy group, a propoxy group, or a butoxy group.

The compound represented by the general formula (N-1-10) can be used alone, or two or more compounds can be used in combination. There are no particular restrictions on the types of compounds that can be combined, but they are used in appropriate combinations according to the required properties such as solubility at low temperatures, transition temperatures, electrical reliability, and birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention, two kinds, three kinds, four kinds, and five kinds or more.

It is preferable to set a higher content in the case of emphasizing improved [Delta] [epsilon], to emphasize the solubility at low temperature highly effective when larger amount to set the content, when importance is attached to T _NI content Highly effective when set to. Furthermore, when improving dripping marks and image sticking characteristics, it is preferable to set the content range in the middle.

The lower limit of the preferable content of the compound represented by the formula (N-1-10) with respect to the total amount of the composition of the present invention is 5%, 10%, 13%, 15% 17% and 20%. The upper limit of the preferable content is 35%, 30%, 28%, 25%, 23%, 20%, and 18% with respect to the total amount of the composition of the present invention. %, 15%, and 13%.

Further, the compound represented by the general formula (N-1-10) is a compound selected from the group of compounds represented by the formula (N-1-10.1) to the formula (N-1-10.11). Preferably, it is a compound represented by the formulas (N-1-10.1) to (N-1-10.5), and the formula (N-1-10.1) and the formula (N The compound represented by (1-10.2) is preferable.

The compounds represented by the formula (N-1-10.1) and the formula (N-1-10.2) can be used alone or in combination. The lower limit of the preferable content of these compounds alone or with respect to the total amount is 5%, 10%, 13%, 15%, 17%, and 20%. The upper limit of the preferable content is 35%, 30%, 28%, 25%, 23%, 20%, and 18% with respect to the total amount of the composition of the present invention. %, 15%, and 13%.

The compound represented by the general formula (N-1-11) is the following compound.

(In the formula, R ^N1111 and R ^N1112 each independently represent the same meaning as R ^N11 and R ^N12 in formula (N-1).)
R ^N1111 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and preferably an ethyl group, a propyl group or a butyl group. R ^N1112 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms, and preferably an ethoxy group, a propoxy group or a butoxy group.

The compound represented by the general formula (N-1-11) can be used alone, or two or more compounds can be used in combination. There are no particular restrictions on the types of compounds that can be combined, but they are used in appropriate combinations according to the required properties such as solubility at low temperatures, transition temperatures, electrical reliability, and birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention, two kinds, three kinds, four kinds, and five kinds or more.

It is preferable to set a higher content in the case of emphasizing improved [Delta] [epsilon], to emphasize the solubility at low temperature highly effective when larger amount to set the content, when importance is attached to T _NI content Highly effective when set to. Furthermore, when improving dripping marks and image sticking characteristics, it is preferable to set the content range in the middle.

The lower limit of the preferable content of the compound represented by the formula (N-1-11) with respect to the total amount of the composition of the present invention is 5%, 10%, 13%, 15% 17% and 20%. The upper limit of the preferable content is 35%, 30%, 28%, 25%, 23%, 20%, and 18% with respect to the total amount of the composition of the present invention. %, 15%, and 13%.

Further, the compound represented by the general formula (N-1-11) is a compound selected from the group of compounds represented by the formula (N-1-11.1) to the formula (N-1-11.15). Preferably, it is a compound represented by the formulas (N-1-11.1) to (N-1-11.15), and is preferably a compound represented by the formula (N-1-11.2) or the formula (N-- The compound represented by 1-11.4) is preferable.

The compounds represented by the formula (N-1-11.2) and the formula (N-1-11.4) can be used alone or in combination. The lower limit of the preferable content of these compounds alone or with respect to the total amount is 5%, 10%, 13%, 15%, 17%, and 20%. The upper limit of the preferable content is 35%, 30%, 28%, 25%, 23%, 20%, and 18% with respect to the total amount of the composition of the present invention. %, 15%, and 13%.

The compound represented by the general formula (N-1-12) is the following compound.

( ^Wherein , R ^N1121 and R ^N1122 each independently represent the same meaning as R ^N11 and R ^N12 in formula (N-1)).
^RN1121 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and preferably an ethyl group, a propyl group or a butyl group. ^RN1122 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and preferably an ethoxy group, a propoxy group, or a butoxy group.

The compound represented by the general formula (N-1-12) can be used alone, or two or more compounds can be used in combination. There are no particular restrictions on the types of compounds that can be combined, but they are used in appropriate combinations according to the required properties such as solubility at low temperatures, transition temperatures, electrical reliability, and birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention, two kinds, three kinds, four kinds, and five kinds or more.

It is preferable to set a higher content in the case of emphasizing improved [Delta] [epsilon], to emphasize the solubility at low temperature highly effective when larger amount to set the content, when importance is attached to T _NI content Highly effective when set to. Furthermore, when improving dripping marks and image sticking characteristics, it is preferable to set the content range in the middle.

The lower limit of the preferable content of the compound represented by the formula (N-1-12) with respect to the total amount of the composition of the present invention is 5%, 10%, 13%, 15% 17% and 20%. The upper limit of the preferable content is 35%, 30%, 28%, 25%, 23%, 20%, and 18% with respect to the total amount of the composition of the present invention. %, 15%, and 13%.

The compound represented by the general formula (N-1-13) is the following compound.

( ^Wherein , R ^N1131 and R ^N1132 each independently represent the same meaning as R ^N11 and R ^N12 in formula (N-1)).
R ^N1131 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and preferably an ethyl group, a propyl group or a butyl group. R ^N1132 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and preferably an ethoxy group, a propoxy group, or a butoxy group.

The compound represented by the general formula (N-1-13) can be used alone, or two or more compounds can be used in combination. There are no particular restrictions on the types of compounds that can be combined, but they are used in appropriate combinations according to the required properties such as solubility at low temperatures, transition temperatures, electrical reliability, and birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention, two kinds, three kinds, four kinds, and five kinds or more.

It is preferable to set a higher content in the case of emphasizing improved [Delta] [epsilon], to emphasize the solubility at low temperature highly effective when larger amount to set the content, when importance is attached to T _NI content Highly effective when set to. Furthermore, when improving dripping marks and image sticking characteristics, it is preferable to set the content range in the middle.

The lower limit of the preferable content of the compound represented by the formula (N-1-13) with respect to the total amount of the composition of the present invention is 5%, 10%, 13%, 15% 17% and 20%. The upper limit of the preferable content is 35%, 30%, 28%, 25%, 23%, 20%, and 18% with respect to the total amount of the composition of the present invention. %, 15%, and 13%.

The compound represented by the general formula (N-1-15) is the following compound.

( ^Wherein , R ^N1151 and R ^N1152 each independently represent the same meaning as R ^N11 and R ^N12 in formula (N-1)).
^RN1151 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and preferably an ethyl group, a propyl group or a butyl group. R ^N1152 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and preferably an ethoxy group, a propoxy group, or a butoxy group.

The compound represented by the general formula (N-1-15) can be used alone, or two or more compounds can be used in combination. There are no particular restrictions on the types of compounds that can be combined, but they are used in appropriate combinations according to the required properties such as solubility at low temperatures, transition temperatures, electrical reliability, and birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention, two kinds, three kinds, four kinds, and five kinds or more.

It is preferable to set a higher content in the case of emphasizing improved [Delta] [epsilon], to emphasize the solubility at low temperature highly effective when larger amount to set the content, when importance is attached to T _NI content Highly effective when set to. Furthermore, when improving dripping marks and image sticking characteristics, it is preferable to set the content range in the middle.

The lower limit of the preferable content of the compound represented by the formula (N-1-15) with respect to the total amount of the composition of the present invention is 5%, 10%, 13%, 15% 17% and 20%. The upper limit of the preferable content is 35%, 30%, 28%, 25%, 23%, 20%, and 18% with respect to the total amount of the composition of the present invention. %, 15%, and 13%.

The compound represented by the general formula (N-1-17) is the following compound.

( ^Wherein , R ^N1171 and R ^N1172 each independently represent the same meaning as R ^N11 and R ^N12 in formula (N-1)).
^RN1171 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and preferably an ethyl group, a propyl group or a butyl group. R ^N1172 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and preferably an ethoxy group, a propoxy group, or a butoxy group.

The compound represented by the general formula (N-1-17) can be used alone, or two or more compounds can be used in combination. There are no particular restrictions on the types of compounds that can be combined, but they are used in appropriate combinations according to the required properties such as solubility at low temperatures, transition temperatures, electrical reliability, and birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention, two kinds, three kinds, four kinds, and five kinds or more.

It is preferable to set a higher content in the case of emphasizing improved [Delta] [epsilon], to emphasize the solubility at low temperature highly effective when larger amount to set the content, when importance is attached to T _NI content Highly effective when set to. Furthermore, when improving dripping marks and image sticking characteristics, it is preferable to set the content range in the middle.

The lower limit of the preferable content of the compound represented by the formula (N-1-17) with respect to the total amount of the composition of the present invention is 5%, 10%, 13%, 15% 17% and 20%. The upper limit of the preferable content is 35%, 30%, 28%, 25%, 23%, 20%, and 18% with respect to the total amount of the composition of the present invention. %, 15%, and 13%.

The compound represented by the general formula (N-1-20) is the following compound.

(In the formula, R ^N1201 and R ^N1202 each independently represent the same meaning as R ^N11 and R ^N12 in formula (N-1).)
The compound represented by the general formula (N-1-21) is the following compound.

(In the formula, R ^N1211 and R ^N1212 each independently represent the same meaning as R ^N11 and R ^N12 in formula (N-1).)
The compound represented by the general formula (N-2) is preferably a compound selected from the group of compounds represented by the general formulas (N-2-1) to (N-2-3).

The compound represented by the general formula (N-2-1) is the following compound.

^{(Wherein, R N211} and ^{R N212} each independently represents the same meaning as ^{R N11} and ^{R N12} in the general formula (N-2).)
The compound represented by the general formula (N-2-2) is the following compound.

^{(Wherein, R N221} and ^{R N222} each independently represents the same meaning as ^{R N11} and ^{R N12} in the general formula (N-2).)
The compound represented by the general formula (N-2-3) is the following compound.

^{(Wherein, R N231} and ^{R N232} each independently represents the same meaning as ^{R N11} and ^{R N12} in the general formula (N-2).)
The compound represented by the general formula (N-3) is preferably a compound selected from the group of compounds represented by the general formulas (N-3-1) to (N-3-2).

The compound represented by the general formula (N-3-1) is the following compound.

(In the formula, R ^N311 and R ^N312 each independently represent the same meaning as R ^N11 and R ^N12 in formula (N-3).)
The compound represented by the general formula (N-3-2) is the following compound.

(In the formula, R ^N321 and R ^N322 each independently represent the same meaning as R ^N11 and R ^N12 in formula (N-3).)
The liquid crystal composition in the present invention preferably further contains one or more compounds represented by the general formula (L). The compound represented by the general formula (L) corresponds to a dielectrically neutral compound (Δε value is −2 to 2).

(Wherein R ^L1 and R ^L2 each independently represents an alkyl group having 1 to 8 carbon atoms, and one or two or more non-adjacent —CH ₂ — in the alkyl group are each independently Optionally substituted by —CH═CH—, —C≡C—, —O—, —CO—, —COO— or —OCO—,
n ^L1 represents 0, 1, 2 or 3,
A ^L1 , A ^L2 and A ^L3 each independently represent (a) a 1,4-cyclohexylene group (one —CH ₂ — present in the group or two or more —CH ₂ — not adjacent to each other). May be replaced by -O-.)
(B) a 1,4-phenylene group (one —CH═ present in the group or two or more non-adjacent —CH═ may be replaced by —N═) and (c) Naphthalene-2,6-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or decahydronaphthalene-2,6-diyl group (naphthalene-2,6-diyl group or 1,2 , 3,4-tetrahydronaphthalene-2,6-diyl, one —CH═ or two or more non-adjacent —CH═ may be replaced by —N═.
The group (a), the group (b) and the group (c) are each independently substituted with a cyano group, a fluorine atom or a chlorine atom,
Z ^L1 and Z ^L2 are each independently a single bond, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —OCH ₂ —, —CH ₂ O—, —COO—, —OCO—, —OCF ₂ -, -CF ₂ O-, -CH = NN-CH-, -CH = CH-, -CF = CF- or -C≡C-
When a plurality of A ^L2 and Z ^L3 are present, they may be the same or different. However, in the general formula (L), the compounds represented by the general formula (a), the general formula (ii), the general formula (N-1), the general formula (N-2), and the general formula (N-3) except. )
Although the compound represented by general formula (L) may be used independently, it can also be used in combination. There are no particular restrictions on the types of compounds that can be combined, but they are used in appropriate combinations according to desired properties such as solubility at low temperatures, transition temperatures, electrical reliability, and birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention. Alternatively, in another embodiment of the present invention, there are two types, three types, four types, five types, six types, seven types, eight types, nine types, 10 types, More than types.

In the composition of the present invention, the content of the compound represented by the general formula (L) is low-temperature solubility, transition temperature, electrical reliability, birefringence, process compatibility, dripping marks, image sticking, It is necessary to appropriately adjust according to required performance such as dielectric anisotropy.

The lower limit of the preferable content of the compound represented by the formula (L) with respect to the total amount of the composition of the present invention is 1%, 10%, 20%, 30%, 40 %, 50%, 55%, 60%, 65%, 70%, 75%, 80%. The upper limit of the preferable content is 95%, 85%, 75%, 65%, 55%, 45%, 35%, and 25%.

When the viscosity of the composition of the present invention is kept low and a composition having a high response speed is required, the above lower limit value is preferably high and the upper limit value is preferably high. Furthermore, when the composition of the present invention maintains a high Tni and requires a composition having good temperature stability, the above lower limit value is preferably high and the upper limit value is preferably high. Further, when it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable that the above lower limit value is lowered and the upper limit value is low.

When importance is attached to reliability, R ^L1 and R ^L2 are preferably both alkyl groups, and when importance is placed on reducing the volatility of the compound, it is preferably an alkoxy group, and importance is placed on viscosity reduction. In this case, at least one is preferably an alkenyl group.

R ^L1 and R ^L2 are each a linear alkyl group having 1 to 5 carbon atoms or a linear alkyl group having 1 to 4 carbon atoms when the ring structure to which R ^L1 is bonded is a phenyl group (aromatic). When the ring structure to which it is bonded is a saturated ring structure such as cyclohexane, pyran and dioxane, a straight-chain C 1-5 carbon atom is preferred. Alkyl groups, linear alkoxy groups having 1 to 4 carbon atoms and linear alkenyl groups having 2 to 5 carbon atoms are preferred. In order to stabilize the nematic phase, the total of carbon atoms and oxygen atoms, if present, is preferably 5 or less, and is preferably linear.

The alkenyl group is preferably selected from groups represented by any of the formulas (R1) to (R9). (The black dots in each formula represent carbon atoms in the ring structure.)

n ^L1 is preferably 0 when importance is attached to the response speed, 2 or 3 is preferred for improving the upper limit temperature of the nematic phase, and 1 is preferred for balancing these. In order to satisfy the properties required for the composition, it is preferable to combine compounds having different values.

A ^L1 , A ^L2, and A ^L3 are preferably aromatic when it is required to increase Δn, and are preferably aliphatic for improving the response speed, and are each independently trans- 1,4-cyclohexylene group, 1,4-phenylene group, 2-fluoro-1,4-phenylene group, 3-fluoro-1,4-phenylene group, 3,5-difluoro-1,4-phenylene group 1,4-cyclohexenylene group, 1,4-bicyclo [2.2.2] octylene group, piperidine-1,4-diyl group, naphthalene-2,6-diyl group, decahydronaphthalene-2,6 -It preferably represents a diyl group or a 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, and more preferably represents the following structure:

More preferably, it represents a trans-1,4-cyclohexylene group or a 1,4-phenylene group.

Z ^L1 and Z ^L2 are preferably single bonds when the response speed is important.

The number of halogen atoms in the molecule is preferably 0 or 1.

The compound represented by the general formula (L) is preferably a compound selected from the group of compounds represented by the general formulas (L-2) to (L-7).

The compound represented by the general formula (L-2) is the following compound.

(In the formula, R ^L21 and R ^L22 each independently represent the same meaning as R ^L1 and R ^L2 in the general formula (L).)
R ^L21 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and R ^L22 is an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, or a carbon atom. An alkoxy group of 1 to 4 is preferable.

The compound represented by the general formula (L-2) can be used alone, or two or more compounds can be used in combination. There are no particular restrictions on the types of compounds that can be combined, but they are used in appropriate combinations according to the required properties such as solubility at low temperatures, transition temperatures, electrical reliability, and birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention, two kinds, three kinds, four kinds, and five kinds or more.

When emphasizing solubility at low temperatures, it is highly effective to set a large amount of content. Conversely, when emphasizing response speed, setting a small amount of content is highly effective. Furthermore, when improving dripping marks and image sticking characteristics, it is preferable to set the content range in the middle.

The lower limit of the preferable content of the compound represented by the formula (L-2) with respect to the total amount of the composition of the present invention is 1%, 2%, 3%, 5% 7% and 10%. The upper limit of the preferable content is 20%, 15%, 13%, 10%, 8%, 7%, and 6% with respect to the total amount of the composition of the present invention. %, 5%, 3%.

Further, the compound represented by the general formula (L-2) is preferably a compound selected from the group of compounds represented by the formulas (L-2.1) to (L-2.6). A compound represented by formula (L-2.1), formula (L-2.3), formula (L-2.4) and formula (L-2.6) is preferred.

The compound represented by the general formula (L-3) is the following compound.

(In the formula, R ^L31 and R ^L32 each independently represent the same meaning as R ^L1 and R ^L2 in General Formula (L).)
R ^L31 and R ^L32 are each independently preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

The compound represented by the general formula (L-3) can be used alone, or two or more compounds can be used in combination. There are no particular restrictions on the types of compounds that can be combined, but they are used in appropriate combinations according to the required properties such as solubility at low temperatures, transition temperatures, electrical reliability, and birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention, two kinds, three kinds, four kinds, and five kinds or more.

The lower limit of the preferable content of the compound represented by the formula (L-3) with respect to the total amount of the composition of the present invention is 1%, 2%, 3%, 5% 7% and 10%. The upper limit of the preferable content is 20%, 15%, 13%, 10%, 8%, 7%, and 6% with respect to the total amount of the composition of the present invention. %, 5%, 3%.

When a high birefringence is obtained, the effect is high when the content is set to be large. On the other hand, when high Tni is emphasized, the effect is high when the content is set low. Furthermore, when improving dripping marks and image sticking characteristics, it is preferable to set the content range in the middle.

Further, the compound represented by the general formula (L-3) is preferably a compound selected from the group of compounds represented by the formulas (L-3.1) to (L-3.9) A compound represented by formula (L-3.1) to formula (L-3.7) is preferred, and formula (L-3.1), formula (L-3.2), formula (L-3 .6) and (L-3.4) are preferred.

The compound represented by the general formula (L-4) is the following compound.

(In the formula, R ^L41 and R ^L42 each independently represent the same meaning as R ^L1 and R ^L2 in General Formula (L).)
R ^L41 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and R ^L42 is an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, or a carbon atom. An alkoxy group of 1 to 4 is preferable. )
The compound represented by the general formula (L-4) can be used alone, or two or more compounds can be used in combination. There are no particular restrictions on the types of compounds that can be combined, but they are used in appropriate combinations according to the required properties such as solubility at low temperatures, transition temperatures, electrical reliability, and birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention, two kinds, three kinds, four kinds, and five kinds or more.

In the composition of the present invention, the content of the compound represented by the general formula (L-4) is low-temperature solubility, transition temperature, electrical reliability, birefringence, process compatibility, dripping marks, It is necessary to adjust appropriately according to required performance such as image sticking and dielectric anisotropy.

The lower limit of the preferable content of the compound represented by the formula (L-4) with respect to the total amount of the composition of the present invention is 1%, 2%, 3%, 5% 7%, 10%, 14%, 16%, 20%, 23%, 26%, 30%, 35%, 40% . The upper limit of the preferable content of the compound represented by the formula (L-4) with respect to the total amount of the composition of the present invention is 50%, 40%, 35%, and 30%. 20%, 15%, 10%, 5%.

The compound represented by general formula (L-4) is preferably a compound represented by formula (L-4.1) to formula (L-4.3), for example.

Depending on the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence, even if the compound represented by the formula (L-4.1) is contained, the formula (L -4.2) Even if it contains a compound represented by formula (L-4.1), it contains both a compound represented by formula (L-4.1) and a compound represented by formula (L-4.2). Or all the compounds represented by formula (L-4.1) to formula (L-4.3) may be included. The lower limit of the preferable content of the compound represented by formula (L-4.1) or formula (L-4.2) with respect to the total amount of the composition of the present invention is 3%, Yes, 7%, 9%, 11%, 12%, 13%, 18%, 21%, and the preferred upper limit is 45, 40% , 35%, 30%, 25%, 23%, 20%, 18%, 15%, 13%, 10%, 8% .

When both the compound represented by formula (L-4.1) and the compound represented by formula (L-4.2) are contained, the amount of both compounds relative to the total amount of the composition of the present invention is The lower limit of the preferred content is 15%, 19%, 24%, and 30%, and the preferred upper limit is 45, 40%, 35%, and 30%. Yes, 25%, 23%, 20%, 18%, 15%, 13%.

The compound represented by the general formula (L-4) is preferably, for example, a compound represented by the formula (L-4.4) to the formula (L-4.6). It is preferable that it is a compound represented by this.

Depending on the required performance such as solubility at low temperature, transition temperature, electrical reliability, birefringence and the like, even if the compound represented by the formula (L-4.4) is contained, the formula (L -4.5) contains both the compound represented by formula (L-4.4) and the compound represented by formula (L-4.5). It may be.

The lower limit of the preferable content of the compound represented by the formula (L-4.4) or the formula (L-4.5) with respect to the total amount of the composition of the present invention is 3%, Yes, 7%, 9%, 11%, 12%, 13%, 18%, 21%. Preferred upper limit values are 45, 40%, 35%, 30%, 25%, 23%, 20%, 18%, 15%, 13% %, 10%, and 8%.

When both the compound represented by the formula (L-4.4) and the compound represented by the formula (L-4.5) are contained, the amount of both compounds relative to the total amount of the composition of the present invention is The lower limit of the preferred content is 15%, 19%, 24%, and 30%, and the preferred upper limit is 45, 40%, 35%, and 30%. Yes, 25%, 23%, 20%, 18%, 15%, 13%.

The compound represented by the general formula (L-4) is preferably a compound represented by the formula (L-4.7) to the formula (L-4.10), and particularly the formula (L-4. The compound represented by 9) is preferred.

The compound represented by the general formula (L-5) is the following compound.

(In the formula, R ^L51 and R ^L52 each independently represent the same meaning as R ^L1 and R ^L2 in the general formula (L).)
R ^L51 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and R ^L52 is an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, or a carbon atom. An alkoxy group of 1 to 4 is preferable.

The compound represented by the general formula (L-5) can be used alone, or two or more compounds can be used in combination. There are no particular restrictions on the types of compounds that can be combined, but they are used in appropriate combinations according to the required properties such as solubility at low temperatures, transition temperatures, electrical reliability, and birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention, two kinds, three kinds, four kinds, and five kinds or more.

In the composition of the present invention, the content of the compound represented by the general formula (L-5) includes solubility at low temperature, transition temperature, electrical reliability, birefringence index, process suitability, dripping marks, It is necessary to adjust appropriately according to required performance such as image sticking and dielectric anisotropy.

The lower limit of the preferable content of the compound represented by the formula (L-5) with respect to the total amount of the composition of the present invention is 1%, 2%, 3%, 5% 7%, 10%, 14%, 16%, 20%, 23%, 26%, 30%, 35%, 40% . The upper limit of the preferable content of the compound represented by the formula (L-5) with respect to the total amount of the composition of the present invention is 50%, 40%, 35%, and 30%. , 20%, 15%, 10%, 5% The compound represented by the general formula (L-5) is represented by the formula (L-5.1) or the formula (L-5.2). The compound represented by formula (L-5.1) is particularly desirable.

The lower limit of the preferable content of these compounds with respect to the total amount of the composition of the present invention is 1%, 2%, 3%, 5%, and 7%. The upper limit of the preferable content of these compounds is 20%, 15%, 13%, 10%, and 9%.

The compound represented by the general formula (L-5) is preferably a compound represented by the formula (L-5.3) or the formula (L-5.4).

The lower limit of the preferable content of these compounds with respect to the total amount of the composition of the present invention is 1%, 2%, 3%, 5%, and 7%. The upper limit of the preferable content of these compounds is 20%, 15%, 13%, 10%, and 9%.

The compound represented by the general formula (L-5) is preferably a compound selected from the group of compounds represented by the formulas (L-5.5) to (L-5.7). The compound represented by L-5.7) is preferred.

The lower limit of the preferable content of these compounds with respect to the total amount of the composition of the present invention is 1%, 2%, 3%, 5%, and 7%. The upper limit of the preferable content of these compounds is 20%, 15%, 13%, 10%, and 9%.

The compound represented by the general formula (L-6) is the following compound.

(In the formula, R ^L61 and R ^L62 each independently represent the same meaning as R ^L1 and R ^L2 in the general formula (L), and X ^L61 and X ^L62 each independently represent a hydrogen atom or a fluorine atom. )
R ^L61 and R ^L62 are each independently preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and one of X ^L61 and X ^L62 is a fluorine atom and the other is a hydrogen atom. Is preferred.

The compound represented by the general formula (L-6) can be used alone, or two or more compounds can be used in combination. There are no particular restrictions on the types of compounds that can be combined, but they are used in appropriate combinations according to the required properties such as solubility at low temperatures, transition temperatures, electrical reliability, and birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention, two kinds, three kinds, four kinds, and five kinds or more.

The lower limit of the preferable content of the compound represented by the formula (L-6) with respect to the total amount of the composition of the present invention is 1%, 2%, 3%, 5% 7%, 10%, 14%, 16%, 20%, 23%, 26%, 30%, 35%, 40% . The upper limit of the preferable content of the compound represented by the formula (L-6) with respect to the total amount of the composition of the present invention is 50%, 40%, 35%, and 30%. 20%, 15%, 10%, 5%. When emphasizing to increase Δn, it is preferable to increase the content, and when emphasizing the precipitation at low temperature, it is preferable to decrease the content.

The compound represented by the general formula (L-6) is preferably a compound represented by the formula (L-6.1) to the formula (L-6.9).

There are no particular restrictions on the types of compounds that can be combined, but 1 to 3 types of these compounds are preferably contained, more preferably 1 to 4 types. Further, since the wide molecular weight distribution of the selected compound is also effective for the solubility, for example, one type of the compound represented by the formula (L-6.1) or (L-6.2), the formula (L- 6.4) or one type from the compound represented by (L-6.5), one type from the compound represented by formula (L-6.6) or formula (L-6.7), It is preferable to select one compound from the compounds represented by -6.8) or (L-6.9) and combine them as appropriate. Among them, represented by formula (L-6.1), formula (L-6.3), formula (L-6.4), formula (L-6.6) and formula (L-6.9). It is preferable to include a compound.

Further, the compound represented by the general formula (L-6) is preferably, for example, a compound represented by the formula (L-6.10) to the formula (L-6.17). A compound represented by L-6.11) is preferable.

The lower limit of the preferable content of these compounds with respect to the total amount of the composition of the present invention is 1%, 2%, 3%, 5%, and 7%. The upper limit of the preferable content of these compounds is 20%, 15%, 13%, 10%, and 9%.

The compound represented by the general formula (L-7) is the following compound.

^{(Wherein, R L71} and ^{R L72} each independently represent the same meaning as ^{R L1} and ^{R L2} in Formula ^{(L), A L71} and ^{A L72} is ^{A L2} and in the general formula (L) independently A ^L3 represents the same meaning, but the hydrogen atoms on A ^L71 and A ^L72 may be each independently substituted with a fluorine atom, Z ^L71 represents the same meaning as Z ^L2 in formula (L), X ^L71 and X ^L72 each independently represent a fluorine atom or a hydrogen atom.)
In the formula, R ^L71 and R ^L72 are each independently preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and A ^L71 and A ^L72 Are each independently preferably a 1,4-cyclohexylene group or a 1,4-phenylene group, the hydrogen atoms on A ^L71 and A ^L72 may be each independently substituted with a fluorine atom, and Q ^L71 is a single group. A bond or COO- is preferable, a single bond is preferable, and X ^L71 and X ^L72 are preferably a hydrogen atom.

There are no particular restrictions on the types of compounds that can be combined, but they are combined according to the required performance, such as solubility at low temperatures, transition temperature, electrical reliability, and birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention, two kinds, three kinds, and four kinds.

In the composition of the present invention, the content of the compound represented by the general formula (L-7) includes solubility at low temperature, transition temperature, electrical reliability, birefringence index, process suitability, dripping marks, It is necessary to adjust appropriately according to required performance such as image sticking and dielectric anisotropy.

The lower limit of the preferable content of the compound represented by the formula (L-7) with respect to the total amount of the composition of the present invention is 1%, 2%, 3%, 5% 7%, 10%, 14%, 16%, 20%. The upper limit of the preferable content of the compound represented by the formula (L-7) with respect to the total amount of the composition of the present invention is 30%, 25%, 23%, and 20%. 18%, 15%, 10%, 5%.

When an embodiment with high Tni is desired for the composition of the present invention, the content of the compound represented by formula (L-7) is preferably increased, and when an embodiment with low viscosity is desired, the content is It is preferable to reduce the amount.

Further, the compound represented by the general formula (L-7) is preferably a compound represented by the formula (L-7.1) to the formula (L-7.4), and the formula (L-7. It is preferable that it is a compound represented by 2).

Further, the compound represented by the general formula (L-7) is preferably a compound represented by the formula (L-7.11) to the formula (L-7.13). It is preferable that it is a compound represented by 11).

Furthermore, the compound represented by the general formula (L-7) is a compound represented by the formula (L-7.21) to the formula (L-7.23). A compound represented by formula (L-7.21) is preferable.

Further, the compound represented by the general formula (L-7) is preferably a compound represented by the formula (L-7.31) to the formula (L-7.34), and the formula (L-7. 31) or / and a compound represented by the formula (L-7.32).

Further, the compound represented by the general formula (L-7) is preferably a compound represented by the formula (L-7.41) to the formula (L-7.44), and the formula (L-7. 41) or / and a compound represented by formula (L-7.42).

The liquid crystal composition of the present invention contains the compounds represented by the general formula (a) and the general formula (ii), and the total content of these compounds is 5% ( % In the composition represents% by mass.) It is preferably contained in an amount of preferably 10% or more, preferably 13% or more, preferably 15% or more, and 18% or more. It is preferable to contain 20% or more, preferably 23% or more, preferably 25% or more, preferably 28% or more, and preferably 30% or more. 33% or more, preferably 35% or more, preferably 38% or more, and preferably 40% or more. Further, the upper limit value is preferably 95% or less, preferably 90% or less, preferably 88% or less, preferably 85% or less, and preferably 83% or less. 80% or less, preferably 78% or less, preferably 75% or less, preferably 73% or less, preferably 70% or less, preferably 68% or less Preferably 65% or less, preferably 63% or less, preferably 60% or less, preferably 55% or less, preferably 50% or less, It is preferable to contain 40% or less.

In the liquid crystal composition of the present invention, the content of the compounds represented by general formula (a), general formula (ii) and general formula (N-1) to general formula (N-3) is the lower limit in the composition. The value is preferably 5% or more, preferably 10% or more, preferably 13% or more, preferably 15% or more, preferably 18% or more, 20% It is preferably contained, preferably 23% or more, preferably 25% or more, preferably 28% or more, preferably 30% or more, and 33% or more. Preferably, it contains 35% or more, preferably 38% or more, and preferably 40% or more. Further, the upper limit value is preferably 95% or less, preferably 90% or less, preferably 88% or less, preferably 85% or less, and preferably 83% or less. 80% or less, preferably 78% or less, preferably 75% or less, preferably 73% or less, preferably 70% or less, preferably 68% or less Preferably 65% or less, preferably 63% or less, preferably 60% or less, preferably 55% or less, preferably 50% or less, It is preferable to contain 40% or less.

The liquid crystal composition of the present invention preferably contains compounds represented by general formula (a), general formula (ii) and general formula (N-1), and the total content of these compounds is The lower limit of the content is preferably 5% or more, preferably 10% or more, preferably 13% or more, preferably 15% or more, and 18% or more. Preferably, 20% or more is contained, preferably 23% or more, preferably 25% or more, preferably 28% or more, preferably 30% or more, 33% or more It is preferable to contain, it is preferable to contain 35% or more, it is preferable to contain 38% or more, and it is preferable to contain 40% or more. Further, the upper limit value is preferably 100% or less, preferably 99% or less, preferably 95% or less, preferably 90% or less, and preferably 85% or less. 80% or less, preferably 75% or less, preferably 70% or less, preferably 65% or less, preferably 60% or less, preferably 55% or less Preferably 50% or less, preferably 40% or less, preferably 38% or less, preferably 35% or less, preferably 33% or less, It is preferable to contain 30% or less, preferably 28% or less, and preferably 25% or less. Preferably contains 23% or less, preferably contains 20% or less, preferably contains 18% or less, preferably it contains less than 15%, and preferably 10% or less.

In the liquid crystal composition of the present invention, it is preferable to contain compounds represented by general formula (a), general formula (ii) and general formula (L), and the content of these compounds is the lower limit in the composition. The value is preferably 5% or more, preferably 10% or more, preferably 13% or more, preferably 15% or more, preferably 18% or more, 20% It is preferably contained, preferably 23% or more, preferably 25% or more, preferably 28% or more, preferably 30% or more, and 33% or more. Preferably, it contains 35% or more, preferably 38% or more, and preferably 40% or more. Further, the upper limit value is preferably 95% or less, preferably 90% or less, preferably 88% or less, preferably 85% or less, and preferably 83% or less. 80% or less, preferably 78% or less, preferably 75% or less, preferably 73% or less, preferably 70% or less, preferably 68% or less Preferably 65% or less, preferably 63% or less, preferably 60% or less, preferably 55% or less, preferably 50% or less, It is preferable to contain 40% or less.

The liquid crystal composition of the present invention contains the total of the compounds represented by general formula (a), general formula (ii), general formula (N-1) to general formula (N-3) and general formula (L). The amount is preferably 5% or more, preferably 80% or more, preferably 85% or more, preferably 88% or more, preferably 90% or more, as the lower limit in the composition. It is preferable to contain, preferably 92% or more, preferably 95% or more, preferably 97% or more, preferably 98% or more, preferably 99% or more. It is preferable that substantially no other compound is contained. Further, the upper limit value is preferably 90% or less, preferably 95% or less, preferably 98% or less, preferably 99% or less, and substantially contains other compounds. Preferably not. The term “substantially” means that an unintentionally contained compound such as impurities inevitably generated during production is excluded.

In the liquid crystal composition of the present invention, the total content of the compounds represented by general formula (a), general formula (ii), general formula (N-1) and general formula (L) is the lower limit in the composition. The content is preferably 5% or more, preferably 80% or more, preferably 85% or more, preferably 88% or more, preferably 90% or more, 92% It is preferable to contain 95% or more, preferably 97% or more, preferably 98% or more, preferably 99% or more, and substantially contain other compounds. It is preferable not to contain. Further, the upper limit value is preferably 90% or less, preferably 95% or less, preferably 98% or less, preferably 99% or less, and substantially contains other compounds. Preferably not.

The liquid crystal composition of the present invention has a dielectric anisotropy (Δε) at 25 ° C. of −1.5 to −8.0, preferably −2.5 to −6.0, -5.5 is more preferable, and -3.0 to -5.0 is particularly preferable.

The liquid crystal composition of the present invention has a refractive index anisotropy (Δn) at 20 ° C. of 0.08 to 0.14, more preferably 0.09 to 0.13, and 0.09 to 0.12. Particularly preferred. More specifically, it is preferably 0.10 to 0.13 when dealing with a thin cell gap, and preferably 0.08 to 0.10 when dealing with a thick cell gap.

The liquid crystal composition of the present invention has a viscosity (η) at 20 ° C. of 10 to 50 mPa · s, preferably 10 to 45 mPa · s, preferably 10 to 40 mPa · s, and preferably 10 to 35 mPa · s. S is preferable, 10 to 30 mPa · s is preferable, 10 to 25 mPa · s is preferable, and 10 to 22 mPa · s is particularly preferable.

The liquid crystal composition of the present invention has a rotational viscosity (γ ₁ ) at 20 ° C. of 60 to 230 mPa · s, and the lower limit is preferably 60 mPa · s, preferably 65 mPa · s, and preferably 75 mPa · s. 230 mPa · s is preferred, 200 mPa · s is preferred, 190 mPa · s is preferred, 180 mPa · s is preferred, 170 mPa · s is preferred, 160 mPa · s is preferred, 150 mPa · s is preferred, 140 mPa · s is preferred, 130 mPa · s is preferred · S is preferable, 120 mPa · s is preferable, and 110 mPa · s is particularly preferable.

The liquid crystal composition of the present invention has a nematic phase-isotropic liquid phase transition temperature (T _ni ) of 60 ° C. to 120 ° C., more preferably 75 ° C. to 110 ° C., and particularly preferably 80 ° C. to 105 ° C.

The liquid crystal composition of the present invention may contain a normal nematic liquid crystal, a smectic liquid crystal, a cholesteric liquid crystal, an antioxidant, an ultraviolet absorber, an infrared absorber, a polymerizable monomer, or a light stabilizer in addition to the above-described compounds. Good.

The liquid crystal composition of the present invention may contain a compound called HALS as a light stabilizer. For example, it is preferable to contain commercially available Tinuvin770 or LA-57 in the range of 100 ppm to 2000 ppm. In addition to the light stabilizer, a hindered phenol-based antioxidant may be appropriately contained in the range of 1 ppm to 1000 ppm. Commercially available light stabilizers and antioxidants may be used as they are, but higher effects can be obtained by improving the purity.

The liquid crystal display device using the liquid crystal composition of the present invention has excellent display quality and high response speed, and is applied to active matrix drive VA type, PSVA type, PSA type, FFS type, IPS type or ECB type. However, it is particularly preferable to apply to the FFS type or IPS type.
Hereinafter, examples of FFS type and IPS type liquid crystal display elements will be described with reference to FIGS.

FIG. 1 is a diagram schematically showing a configuration of a liquid crystal display element. In FIG. 1, for convenience of explanation, each component is illustrated separately. As shown in FIG. 1, the liquid crystal display element 10 according to the present invention has a liquid crystal composition sandwiched between a first transparent insulating substrate 2 and a second transparent insulating substrate 7 that are arranged to face each other. An FFS mode liquid crystal display element having a product (or liquid crystal layer 5), characterized in that the liquid crystal composition of the present invention is used as the liquid crystal composition. The first transparent insulating substrate 2 has an electrode layer 3 formed on the surface on the liquid crystal layer 5 side. In addition, a pair of alignments that directly contact the liquid crystal composition constituting the liquid crystal layer 5 and induce homogeneous alignment between the liquid crystal layer 5 and the first transparent insulating substrate 2 and the second transparent insulating substrate 7. The film 4 is provided, and the liquid crystal molecules in the liquid crystal composition are aligned so as to be substantially parallel to the substrates 2 and 7 when no voltage is applied. As shown in FIGS. 1 and 3, the first substrate 2 and the second substrate 7 may be sandwiched between a pair of polarizing plates 1 and 8. Further, in FIG. 1, a color filter 6 is provided between the second substrate 7 and the alignment film 4.

That is, the liquid crystal display element 10 according to the present invention includes a first polarizing plate 1, a first substrate 2, an electrode layer 3 including a thin film transistor, an alignment film 4, a liquid crystal layer 5 including a liquid crystal composition, The alignment film 4, the color filter 6, the second substrate 7, and the second polarizing plate 8 are sequentially stacked. The first substrate 2 and the second substrate 7 can be made of a transparent material having flexibility such as glass or plastic, and one of them can be an opaque material such as silicon. The two substrates 2 and 7 are bonded together by a sealing material and a sealing material such as an epoxy thermosetting composition disposed in the peripheral region, and in order to maintain the distance between the substrates, for example, Spacer columns made of resin formed by granular spacers such as glass particles, plastic particles, alumina particles, or a photolithography method may be arranged.

FIG. 2 is an enlarged plan view of a region surrounded by the II line of the electrode layer 3 formed on the substrate 2 in FIG. FIG. 3 is a cross-sectional view of the liquid crystal display element shown in FIG. 1 cut along the line III-III in FIG. As shown in FIG. 2, the electrode layer 3 including thin film transistors formed on the surface of the first substrate 2 includes a plurality of gate bus lines 26 for supplying scanning signals and a plurality of gate bus lines 26 for supplying display signals. Data bus lines 25 are arranged in a matrix so as to cross each other. In FIG. 2, only a pair of gate bus lines 25 and a pair of data bus lines 24 are shown.

A unit pixel of the liquid crystal display device is formed by a region surrounded by the plurality of gate bus lines 26 and the plurality of data bus lines 25, and a pixel electrode 21 and a common electrode 22 are formed in the unit pixel. . A thin film transistor including a source electrode 27, a drain electrode 24, and a gate electrode 28 is provided in the vicinity of an intersection where the gate bus line 26 and the data bus line 25 intersect each other. The thin film transistor is connected to the pixel electrode 21 as a switch element that supplies a display signal to the pixel electrode 21. A common line 29 is provided in parallel with the gate bus line 26. The common line 29 is connected to the common electrode 22 in order to supply a common signal to the common electrode 22.

A preferred embodiment of the structure of the thin film transistor is provided, for example, as shown in FIG. 3 so as to cover the gate electrode 11 formed on the surface of the substrate 2 and the gate electrode 11 and cover the substantially entire surface of the substrate 2. A protective film provided to cover a part of the surface of the gate insulating layer 12, the semiconductor layer 13 formed on the surface of the gate insulating layer 12 so as to face the gate electrode 11, and the semiconductor layer 17. 14, a drain electrode 16 provided so as to cover one side end of the protective layer 14 and the semiconductor layer 13 and to be in contact with the gate insulating layer 12 formed on the surface of the substrate 2, and the protection A source electrode 17 which covers the film 14 and the other side end of the semiconductor layer 13 and is in contact with the gate insulating layer 12 formed on the surface of the substrate 2; Has an insulating protective layer 18 provided to cover the electrode 16 and the source electrode 17, a. An anodic oxide film (not shown) may be formed on the surface of the gate electrode 11 for reasons such as eliminating a step with the gate electrode.

Amorphous silicon, polycrystalline polysilicon, or the like can be used for the semiconductor layer 13, but when a transparent semiconductor film such as ZnO, IGZO (In—Ga—Zn—O), ITO, or the like is used, it results from light absorption. It is also preferable from the viewpoint of suppressing the adverse effect of optical carriers and increasing the aperture ratio of the element.

Furthermore, an ohmic contact layer 15 may be provided between the semiconductor layer 13 and the drain electrode 16 or the source electrode 17 for the purpose of reducing the width and height of the Schottky barrier. For the ohmic contact layer, a material in which an impurity such as phosphorus such as n-type amorphous silicon or n-type polycrystalline polysilicon is added at a high concentration can be used.

The gate bus line 26, the data bus line 25, and the common line 29 are preferably metal films, more preferably Al, Cu, Au, Ag, Cr, Ta, Ti, Mo, W, Ni, or an alloy thereof, Al or Cu The case of using the alloy wiring is particularly preferable. The insulating protective layer 18 is a layer having an insulating function, and is formed of silicon nitride, silicon dioxide, silicon oxynitride film, or the like.

In the embodiment shown in FIGS. 2 and 3, the common electrode 22 is a flat electrode formed on almost the entire surface of the gate insulating layer 12, while the pixel electrode 21 is an insulating protective layer 18 covering the common electrode 22. It is a comb-shaped electrode formed on the top. That is, the common electrode 22 is disposed at a position closer to the first substrate 2 than the pixel electrode 21, and these electrodes are disposed so as to overlap each other via the insulating protective layer 18. The pixel electrode 21 and the common electrode 22 are formed of a transparent conductive material such as ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), IZTO (Indium Zinc Tin Oxide), and the like. Since the pixel electrode 21 and the common electrode 22 are formed of a transparent conductive material, the area opened by the unit pixel area increases, and the aperture ratio and transmittance increase.

In order to form a fringe electric field between these electrodes, the pixel electrode 21 and the common electrode 22 have a horizontal inter-electrode distance: R on the substrate between the pixel electrode 21 and the common electrode 22. The distance between 2 and the second substrate 7 is smaller than G. Here, the distance between electrodes: R represents the distance in the horizontal direction on the substrate between the electrodes. FIG. 3 shows an example in which the plate-like common electrode 22 and the comb-shaped pixel electrode 21 overlap with each other, and therefore an inter-electrode distance: R = 0 is shown, and the inter-electrode distance: R is the first substrate. The distance between the second substrate 7 and the second substrate 7 (ie, the cell gap) is smaller than G, so that a fringe electric field E is formed. Therefore, the FFS type liquid crystal display element can use a horizontal electric field formed in a direction perpendicular to a line forming the comb shape of the pixel electrode 21 and a parabolic electric field. The electrode width of the comb-shaped portion of the pixel electrode 21: l and the width of the gap of the comb-shaped portion of the pixel electrode 21: m are such that all the liquid crystal molecules in the liquid crystal layer 5 can be driven by the generated electric field. It is preferable to form.

The color filter 6 preferably forms a black matrix (not shown) in a portion corresponding to the thin film transistor and the storage capacitor 23 from the viewpoint of preventing light leakage.

On the electrode layer 3 and the color filter 6, a pair of alignment films 4 that directly contact the liquid crystal composition constituting the liquid crystal layer 5 and induce homogeneous alignment are provided. The alignment film 4 is, for example, a rubbed polyimide film, and the alignment directions of the alignment films are parallel. Here, the rubbing direction (alignment direction of the liquid crystal composition) of the alignment film 4 in the present embodiment will be described with reference to FIG. FIG. 4 is a diagram schematically showing the alignment direction of the liquid crystal induced by the alignment film 4. In the present invention, a liquid crystal composition having negative dielectric anisotropy is used. Therefore, when the direction perpendicular to the line forming the comb shape of the pixel electrode 21 (the direction in which the horizontal electric field is formed) is the x-axis, the angle θ formed by the x-axis and the major axis direction of the liquid crystal molecules 30. However, the orientation is preferably approximately 0 to 45 °. In the example shown in FIG. 3, an example in which the angle θ formed by the x-axis and the major axis direction of the liquid crystal molecules 30 is approximately 0 ° is shown. The reason for inducing the alignment direction of the liquid crystal is to increase the maximum transmittance of the liquid crystal display device.

In addition, the polarizing plate 1 and the polarizing plate 8 can be adjusted so that the viewing angle and the contrast are good by adjusting the polarizing axis of each polarizing plate, and the transmission axes thereof operate in the normally black mode. In addition, it is preferable to have transmission axes perpendicular to each other. In particular, any one of the polarizing plate 1 and the polarizing plate 8 is preferably arranged so as to have a transmission axis parallel to the alignment direction of the liquid crystal molecules 30. Further, it is preferable to adjust the product of the refractive index anisotropy Δn of the liquid crystal and the cell thickness d so that the contrast is maximized. Furthermore, a retardation film for widening the viewing angle can also be used.

The FFS type liquid crystal display device 10 configured as described above generates a fringe electric field between the pixel electrode 21 and the common electrode 22 by supplying an image signal (voltage) to the pixel electrode 21 via the thin film TFT. The liquid crystal is driven by this electric field. That is, in a state where no voltage is applied, the liquid crystal molecules 30 are arranged so that the major axis direction thereof is parallel to the alignment direction of the alignment film 4. When a voltage is applied, an equipotential line of a parabolic electric field is formed between the pixel electrode 21 and the common electrode 22 up to the upper part of the pixel electrode 21 and the common electrode 22, and the liquid crystal molecules 30 in the liquid crystal layer 5 are formed. The liquid crystal layer 5 is rotated along the generated electric field. In the present invention, since the liquid crystal molecules 30 having negative dielectric anisotropy are used, the major axis direction of the liquid crystal molecules 30 rotates so as to be perpendicular to the generated electric field direction. Although the liquid crystal molecules 30 located near the pixel electrode 21 are easily affected by the fringe electric field, the liquid crystal molecules 30 having a negative dielectric anisotropy have a polarization direction on the minor axis of the molecule, so Does not rotate in a direction perpendicular to the alignment film 4, and the major axis direction of all the liquid crystal molecules 30 in the liquid crystal layer 5 can be maintained parallel to the alignment film 4. Therefore, excellent transmittance characteristics can be obtained as compared with the FFS type liquid crystal display element using the liquid crystal molecules 30 having positive dielectric anisotropy.

The FFS type liquid crystal display element described with reference to FIGS. 1 to 4 is an example, and can be implemented in various other forms without departing from the technical idea of the present invention. For example, FIG. 5 is another example of a plan view in which the region surrounded by the II line of the electrode layer 3 formed on the substrate 2 in FIG. 1 is enlarged. As shown in FIG. 5, the pixel electrode 21 may have a slit. Further, the slit pattern may be formed to have an inclination angle with respect to the gate bus line 26 or the data bus line 25.

6 is another example of a cross-sectional view of the liquid crystal display element shown in FIG. 1 cut along the line III-III in FIG. In the example shown in FIG. 6, the common electrode 22 having a comb shape or a slit is used, and the distance between the pixel electrode 21 and the common electrode 22 is R = α. Further, FIG. 3 shows an example in which the common electrode 22 is formed on the gate insulating film 12. However, as shown in FIG. 6, the common electrode 22 is formed on the first substrate 2, The pixel electrode 21 may be provided via the gate insulating film 12. The electrode width of the pixel electrode 21: l, the electrode width of the common electrode 22: n, and the interelectrode distance: R are appropriately adjusted to such a width that all liquid crystal molecules in the liquid crystal layer 5 can be driven by the generated electric field. It is preferable.

The IPS liquid crystal display element is formed on the substrate between the pixel electrode and the common electrode so that the inter-electrode distance R in the horizontal direction is smaller than the distance G between the first substrate and the second substrate facing each other. Is done. Therefore, in the IPS liquid crystal display element, the pixel electrode may be provided on the liquid crystal layer side from the common electrode as shown in FIG. 6, and the pixel electrode 41 and the common electrode 42 are on the same surface as shown in FIG. May be provided in a state of being engaged with each other.

EXAMPLES The present invention will be described in further detail with reference to examples below, but the present invention is not limited to these examples. Further, “%” in the compositions of the following Examples and Comparative Examples means “% by mass”.
The following abbreviations are used for the description of compounds in the examples. Note that n represents a natural number.
(Side chain)
-N -C _n H _{2n + 1} linear alkyl group with n carbon atoms n- C _n H _{2n + 1} -linear alkyl group with n carbon atoms -On -OC _n H _{2n + 1} linear chain with n carbon atoms -Like alkoxyl group nO- C _n H _{2n + 1} O- linear alkoxyl group having n carbon atoms -V -CH = CH ₂
V- CH ₂ = CH-
-V1 -CH = CH-CH ₃
1V- CH ₃ —CH═CH—
-2V -CH ₂ -CH ₂ -CH = CH ₂
V2- CH ₂ = CH-CH ₂ -CH _2-
-2V1 -CH ₂ -CH ₂ -CH = CH-CH ₃
1V2- CH ₃ —CH═CH—CH ₂ —CH ₂ —
(Linking group)
-N- -C _n H _2n-
—NO— —C _n H _2n —O—
—On— —O—C _n H _2n —
—COO— —C (═O) —O—
-OCO- -OC (= O)-
—CF ₂ O——CF ₂ —O—
-OCF2- -O-CF _2-
(Ring structure)

In the examples, the measured characteristics are as follows.

T _ni : Nematic phase-isotropic liquid phase transition temperature (° C.)
Δn: refractive index anisotropy at 20 ° C. γ ₁ : rotational viscosity at 20 ° C. (mPa · s)
Δε: Dielectric anisotropy flicker evaluation at 20 ° C .: Flickers (flickering) of the FFS type liquid crystal display element shown in FIGS. 1 to 4 are performed by using a liquid crystal display electro-optical characteristic evaluation apparatus DMS series manufactured by autonic-MELCHERS. It was expressed as a flicker rate (%) when a rectangular wave electric field having a frequency of 60 Hz and an applied voltage of 5 V was applied at 25 ° C.

: Flicker rate is 1% or less (very good)
○: Flicker rate 1-2% (acceptable level)
Δ: Flicker rate 2% to 5% (unacceptable level)
×: Flicker rate of 5% or more (very bad)
VHR: Injected into a cell with ITO coated with a polyimide alignment film that induces homeotropic alignment by a vacuum injection method, and adjusted with a high-pressure mercury lamp so that the irradiation intensity of the cell surface was 100 mW / cm ² and irradiated with UV. Thereafter, the voltage holding ratio (VHR) was measured using a 6254 model manufactured by Toyo Corporation. The cell thickness is 3.5 μm, and the measurement conditions of VHR are a voltage of 1 V, a frequency of 60 Hz, and a temperature of 65 ° C.
Burn-in evaluation: After the predetermined fixed pattern was displayed in the display area for 100 hours, the afterimage level of the fixed pattern when the entire screen was uniformly displayed was visually evaluated by the following four-step evaluation.
◎: No afterimage ○: Level of afterimage is slightly acceptable but acceptable: △: Afterimage is unacceptable level ×: Afterimage is fairly poor (Example 1 and Comparative Example 1)
Liquid crystal compositions of Example 1 (LC-1) and Comparative Example 1 (LC-A) shown in Table 1 below were prepared. Table 1 shows the composition of the liquid crystal composition, T _ni , Δn, γ ₁ , Δε, flicker evaluation, VHR, and burn-in evaluation.

The liquid crystal composition LC-1 of Example 1 has a small rotational viscosity (γ ₁ ), and the FFS mode liquid crystal display device produced using the liquid crystal composition LC-1 has less flicker than the liquid crystal composition LC-A of Comparative Example 1. Excellent results were obtained for VHR and display defects (burn-in). Further, when the electro-optical characteristics were evaluated using a liquid crystal display electro-optical characteristic evaluation apparatus DMS series manufactured by autonomic-MELCHERS, it was confirmed that LC-1 has a sufficiently faster response speed than LC-A.
(Example 2 and Comparative Example 2)
The liquid crystal compositions of Example 2 and Comparative Example 2 (LC-B) shown in Table 2 below were prepared. The composition of the liquid crystal composition, T _ni , Δn, γ ₁ , Δε, flicker evaluation, VHR, and burn-in evaluation were as shown in Table 2.

LC-2 has a small rotational viscosity (γ ₁ ), and the FFS mode liquid crystal display device manufactured using LC-2 has better flickering than LC-B, and is superior in VHR and display defects (burn-in). Met. Further, when the electro-optical characteristics were evaluated using a liquid crystal display electro-optical characteristic evaluation apparatus DMS series manufactured by autonic-MELCHERS, it was confirmed that LC-2 had a sufficiently faster response speed than LC-B.
(Example 3, Example 4, Example 5 and Example 6)
The liquid crystal compositions of Example 3 (LC-3), Example 4 (LC-4), Example 5 (LC-5) and Example 6 (LC-6) shown in Table 3 were prepared. The composition of the liquid crystal composition, T _ni , Δn, γ ₁ , Δε, flicker evaluation, VHR, and burn-in evaluation were as shown in Table 3.

LC-3, LC-4, LC-5, and LC-6 have a small rotational viscosity (γ ₁ ), and the FFS mode liquid crystal display device manufactured using LC-3 eliminates flicker and causes VHR, display failure ( The image was also excellent. Further, when the electro-optical characteristics were evaluated using the DMS series liquid crystal display electro-optical characteristics evaluation apparatus manufactured by autonic-MELCHERS, it was confirmed that the response speed was high.
In Examples 1 to 5, the rotational viscosity (γ ₁ ) was smaller, the response speed was sufficiently fast and excellent, and the burn-in evaluation was also excellent.

1, 8 Polarizing plate 2 First substrate 3 Electrode layer 4 Alignment film 5 Liquid crystal layer 6 Color filter 7 Second substrate 11 Gate electrode 12 Gate insulating film 13 Semiconductor layer 14 Insulating layer 15 Ohmic contact layer 16 Drain electrode 17 Source electrode 18 Insulating protective layer 21 Pixel electrode 22 Common electrode 23 Storage capacitor 25 Data bus line 27 Source bus line 29 Common line

Claims (10)

Formula (a)

(Wherein R ^a1 and R ^a2 each independently represents an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms, and one —CH ₂ — or Two or more non-adjacent —CH ₂ — may be each independently substituted with —O— or —S—, and one or more hydrogen atoms present in the group are each May be independently substituted with a fluorine atom or a chlorine atom,
M ^a1 is (b) a 1,4-phenylene group (one —CH═ present in the group or two or more non-adjacent —CH═ may be replaced by —N═) and (C) Naphthalene-2,6-diyl group (one —CH═ present in this group or two or more non-adjacent —CH═ may be replaced by —N═)
The group (b) and the group (c) are each independently substituted with a cyano group, a fluorine atom or a chlorine atom,
Z ^a1 is a single bond, —CH═CH—, —C≡C—, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —COO—, —OCO—, —OCH ₂ —, —CH ₂ O —, —OCF ₂ — or —CF ₂ O—, wherein one or more Z ^a1 represents —CH ₂ CH ₂ —,
m ^a1 represents 1, 2 or 3, and when M ^a1 and a plurality of Z ^a1 are present, they may be the same or different. )
And one or more compounds represented by
Formula (ii)

(In the formula, R ⁱⁱ¹ and R ⁱⁱ² each independently represent an alkyl group having 1 to 10 carbon atoms, and one or non-adjacent two or more —CH ₂ — in the alkyl group is directly bonded to an oxygen atom. Substituted with —O—, —S—, —CH═CH—, —CO—, —OCO—, —COO—, —C≡C—, —CF ₂ O— or —OCF ₂ — so that they are not adjacent. You can.)
A liquid crystal composition containing one or more compounds represented by the formula: 2. The liquid crystal composition according to claim 1, which contains one or more compounds wherein m ⁱ¹ is 1 in the general formula (a). The liquid crystal composition according to claim 1 or 2, which contains one or more compounds in which ^mi1 is 2 in the general formula (a). The liquid crystal composition according to any one of claims 1 to 3, wherein the content of the compound represented by the general formula (a) is 5% by mass or more in the liquid crystal composition. The compound represented by the general formula (ii) is represented by the general formula (ii-1)

^{(Wherein, R ii11} represents a hydrogen atom or a methyl ^{group, R ii2} has the same meaning as ^{R ii2} in the general formula (ii).)
The liquid crystal composition according to any one of claims 1 to 4, wherein: 6. The liquid crystal composition according to claim 1, wherein the content of the compound represented by the general formula (ii) is 20% by mass or more in the liquid crystal composition. Furthermore, the general formula (N-1) to the general formula (N-3)

(Wherein, R ^N11 , R ^N12 , R ^N21 , R ^N22 , R ^N31 and R ^N32 each independently represents an alkyl group having 1 to 8 carbon atoms, and one or non-adjacent 2 in the alkyl group _Two or more —CH ₂ — may be each independently substituted by —CH═CH—, —C≡C—, —O—, —CO—, —COO— or —OCO—,
A ^N11 , A ^N12 , A ^N21 , A ^N22 , A ^N31, and A ^N32 are each independently (a) a 1,4-cyclohexylene group (one —CH ₂ — or adjacent to each other in this group). And two or more —CH ₂ — may be replaced by —O—) and (b) a 1,4-phenylene group (one —CH═ present in this group or not adjacent 2 More than one -CH = may be replaced by -N =.)
(C) (c) Naphthalene-2,6-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or decahydronaphthalene-2,6-diyl group (naphthalene-2,6- One —CH═ present in a diyl group or 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or two or more non-adjacent —CH═ are replaced by —N═. Is also good.)
The group (a), the group (b) and the group (c) may be each independently substituted with a cyano group, a fluorine atom or a chlorine atom,
Z ^N11 , Z ^N12 , Z ^N21 , Z ^N22 , Z ^N31 and Z ^N32 are each independently a single bond, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —OCH ₂ —, —CH ₂ O—. , —COO—, —OCO—, —OCF ₂ —, —CF ₂ O—, —CH═N—N═CH—, —CH═CH—, —CF═CF— or —C≡C—,
^XN21 represents a hydrogen atom or a fluorine atom,
T ^N31 represents —CH ₂ — or an oxygen atom,
n ^N11 , n ^N12 , n ^N21 , n ^N22 , n ^N31, and n ^N32 each independently represent an integer of 0 to 3, but n ^N11 + n ^N12 , n ^N21 + n ^N22, and n ^N31 + n ^N32 are each independently When there are a plurality of A ^N11 to A ^N32 and Z ^N11 to Z ^N32 , they may be the same or different. However, in general formula (N-1) and general formula (N-2), the compound represented by general formula (a) is excluded, and in general formula (N-2) and general formula (N-3) The compound represented by the general formula (N-1) is excluded, and the compound represented by the general formula (N-1) in the general formula (N-3) is further excluded. )
The liquid crystal composition according to claim 1, comprising one or more compounds selected from the group of compounds represented by formula (1): Furthermore, the general formula (L)

(Wherein R ^L1 and R ^L2 each independently represents an alkyl group having 1 to 10 carbon atoms, and one or two or more non-adjacent —CH ₂ — in the alkyl group are each independently Optionally substituted by —CH═CH—, —C≡C—, —O—, —CO—, —COO— or —OCO—,
n ^L1 represents 0, 1, 2 or 3,
A ^L1 , A ^L2 and A ^L3 each independently represent (a) a 1,4-cyclohexylene group (one —CH ₂ — present in the group or two or more —CH ₂ — not adjacent to each other). May be replaced by -O-.)
(B) a 1,4-phenylene group (one —CH═ present in the group or two or more non-adjacent —CH═ may be replaced by —N═) and (c) Naphthalene-2,6-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or decahydronaphthalene-2,6-diyl group (naphthalene-2,6-diyl group or 1,2 , 3,4-tetrahydronaphthalene-2,6-diyl group, one —CH═ or two or more non-adjacent —CH═ may be replaced by —N═.
The group (a), the group (b) and the group (c) may be each independently substituted with a cyano group, a fluorine atom or a chlorine atom,
Z ^L1 and Z ^L2 are each independently a single bond, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —OCH ₂ —, —CH ₂ O—, —COO—, —OCO—, —OCF ₂ -, -CF ₂ O-, -CH = NN-CH-, -CH = CH-, -CF = CF- or -C≡C-
When a plurality of A ^L2 or Z ^L3 are present, they may be the same or different. However, in the general formula (L), the compounds represented by the general formula (a), the general formula (ii), and the general formula (LC3) are excluded. )
The liquid crystal composition according to any one of claims 1 to 7, comprising one or more compounds represented by the formula: The liquid crystal display element using the liquid-crystal composition of any one of Claim 1 to 8. An FFS type or IPS type liquid crystal display element using the liquid crystal composition according to claim 1.

Images