JP6690782B2 - Alignment aid, liquid crystal composition and liquid crystal display device - Google Patents

Description

  The present invention relates to an alignment aid, a liquid crystal composition and a liquid crystal display device.

  Conventionally, in a VA type liquid crystal display, a polyimide (PI) layer that functions as an alignment layer is formed on an electrode in order to induce vertical alignment of liquid crystal molecules when no voltage is applied and to achieve horizontal alignment of liquid crystal molecules when voltage is applied. It is provided. However, since the film formation of the PI layer requires a great deal of cost, in recent years, methods for realizing the alignment of liquid crystal molecules while omitting the PI layer have been investigated.

  For example, Patent Document 1 discloses a liquid crystal medium which is based on a mixture of polar compounds having negative dielectric anisotropy and contains at least one kind of spontaneous alignment additive. Is preferably used in a display that does not include an alignment layer. And in patent document 1, the specific compound which has a hydroxyl group is used as a spontaneous orientation additive.

Special table 2014-524951 gazette

  However, according to the study by the present inventors, when the self-aligning additive described in Patent Document 1 is used, the alignment regulating force for vertically aligning the liquid crystal molecules is not sufficient, and a PI layer is included. When a liquid crystal display device without a liquid crystal display device is produced, alignment unevenness occurs due to the liquid crystal molecules not exhibiting a predetermined alignment state at the end of the liquid crystal display device, and improvement is required. It has been found that there is room for improvement in storage stability because crystals are precipitated during storage of the liquid crystal composition containing the.

  Therefore, an object of the present invention is to ensure the storage stability of a liquid crystal composition containing an alignment aid (self-alignment additive) and liquid crystal molecules, and even if the PI layer is omitted, the liquid crystal molecules will spontaneously move. It is to provide an alignment aid for vertical alignment. Another object of the present invention is to provide a liquid crystal composition which is excellent in storage stability and can realize a liquid crystal display device of PSA type, PSVA type, VA type or the like even if the PI layer is omitted, and the liquid crystal composition. It is to provide a liquid crystal display device using the same.

The present invention is an alignment aid, which is disposed between two substrates together with liquid crystal molecules and spontaneously aligns the liquid crystal molecules,
A first compound comprising at least one first affinity group having an affinity for said substrate;
A second compound having at least one second affinity group having an affinity for the substrate and having a polarity lower than that of the first affinity group, and an alignment aid comprising: provide.

  The present invention also provides a liquid crystal composition containing the alignment aid of the present invention and liquid crystal molecules and having a negative dielectric anisotropy (Δε).

  Furthermore, the present invention provides a liquid crystal display device comprising two substrates and a liquid crystal layer provided between the two substrates and containing the liquid crystal composition of the present invention.

  ADVANTAGE OF THE INVENTION According to this invention, it is excellent in storage stability, and even if the PI layer is omitted, an alignment aid capable of uniform vertical alignment of liquid crystal molecules, a liquid crystal composition containing the alignment aid, and the liquid crystal composition. It is possible to provide a liquid crystal display element using the.

It is a figure which shows one Embodiment of a liquid crystal display element typically. It is the top view which expanded the area | region enclosed by the I line in FIG.

Hereinafter, the alignment aid, the liquid crystal composition, and the liquid crystal display device of the present invention will be described in detail based on preferred embodiments.
(Alignment aid)
The alignment aid of the present invention can spontaneously align the liquid crystal molecules by being arranged between the two substrates together with the liquid crystal molecules. The alignment aid has a first compound having at least one first affinity group having an affinity for the substrate, and at least one having an affinity for the substrate and a polarity lower than that of the first affinity group. A second compound containing two second affinity groups.

  The first compound and the second compound each include an affinity group having an affinity for the substrate and another portion (another structure) having a lower affinity for the substrate than the affinity group.

  Therefore, when a liquid crystal composition containing an alignment aid and liquid crystal molecules is supplied between two substrates to form a liquid crystal layer, both the first compound and the second compound are treated with an affinity group. It can be adsorbed (attached) to the substrate and the other part can be arranged (oriented) away from the substrate. Due to the presence of the first compound and the second compound thus arranged, the liquid crystal molecules can be held in the liquid crystal layer in a state of being vertically aligned.

  Here, since the affinity group has a function of adsorbing (adhering) to the substrate and fixing the first compound and the second compound to the substrate, the adsorptive group (adhesive group), peg group, sinker It can also be called a group (sinker group) or an anchor group.

  According to such an alignment aid of the present invention, liquid crystal molecules are aligned even if the PI layer is omitted (the vertical alignment of liquid crystal molecules is induced when no voltage is applied, and the horizontal alignment of liquid crystal molecules is realized when voltage is applied. Can be done). Therefore, both the first compound and the second compound are preferably used to help the spontaneous alignment of the liquid crystal molecules in the liquid crystal layer.

  The polarities of the first affinity group and the second affinity group are different from each other, and in particular, the polarity of the first affinity group is higher than that of the second affinity group. Therefore, when the liquid crystal composition is supplied onto the substrate, the first affinity group is adsorbed to the substrate earlier than the second affinity group. As a result, the first compound is fixed to the substrate more preferentially than the second compound.

  On the other hand, the second compound is evenly spread on the substrate and then fixed on the substrate. At this time, the second compound can be aligned (oriented) with the first compound fixed on the substrate as a reference (base point).

  Therefore, the alignment aid of the present invention has a polar affinity containing a first compound containing at least one first affinity group and a second compound containing a second affinity group. By containing the second compound having a functional group, a more reliable alignment regulating force of liquid crystal molecules (effect of preventing alignment unevenness) can be exhibited.

  In addition, since the first compound has a first affinity group having a relatively high polarity, increasing the amount contained in the liquid crystal composition tends to facilitate precipitation.

  The alignment aid of the present invention contains the second compound having the second affinity group having a relatively low polarity, thereby preventing or suppressing the precipitation of the first compound in the liquid crystal composition. it can. As a result, the storage stability of the liquid crystal composition (particularly the stability during storage at low temperature) can be ensured.

  Even if the amount of the first compound is reduced, the alignment aid of the present invention can exert a sufficient alignment regulating force of the liquid crystal molecules due to the synergistic effect with the second compound.

  The ratio of the first compound to the second compound in the alignment aid is not particularly limited, but the weight ratio is preferably about 1: 0.1 to 1:10, and 1: 0.5. More preferably, it is about 1: 5. By containing the first compound and the second compound in such a ratio, the alignment aid has both an effect of enhancing the alignment regulating force of liquid crystal molecules and an effect of ensuring the storage stability of the liquid crystal composition. Can be demonstrated reliably.

  The specific amounts of the first compound and the second compound used can be defined in relation to the amount of liquid crystal molecules in the liquid crystal composition.

  The amount of the first compound is preferably about 0.1 to 1.5% by weight, and more preferably about 0.3 to 1.3% by weight, based on 100% by weight of liquid crystal molecules.

  On the other hand, the amount of the second compound is preferably about 0.1 to 1.5% by weight, and more preferably about 0.3 to 1.3% by weight, based on 100% by weight of the liquid crystal molecule. preferable.

  The total amount of the first and second compounds is as small as possible (per 100% by weight of liquid crystal molecules, preferably 1. 4 wt% or less, more preferably about 0.5 to 1 wt%). Thereby, the storage stability of the liquid crystal composition can be further improved.

  The first affinity group and the second affinity group each include a group selected from the following group and are designed so that the polarity of the second affinity group is lower than the polarity of the first affinity group. It is preferred that

(In the formula, a black dot represents a bond.)

  If the substituent contains a group selected from the above group, the polarity of the first affinity group and the second affinity group of the second affinity group becomes lower than the polarity of the first affinity group. It can be easily designed.

  The first affinity group preferably contains a group selected from the group represented by the following chemical formula 2, more preferably selected from the group represented by the following general formulas (K1-1) to (K1-3). preferable.

In formulas (K1-1) to (K1-3), the black dot at the left end represents a bond,
W ^K2 represents a methine group, C—CH ₃ , C—C ₂ H ₅ , a nitrogen atom or a silicon atom,
W ^K3 represents a carbon atom,
X _{1 to} X ₅ each independently represent a hydrogen atom, an —OH group or CH ₂ ═C (CH ₃ ) COO—,
At least one of X ₁ and X ₂ represents an —OH group,
At least one of X ₃ , X ₄ and X ₅ represents an —OH group,
Sp ₁ , Sp ₂ and Sp ₃ each represent a single bond or a spacer group.

Here, as the spacer group, for example, —CH═CH—, —CF═CF—, —C≡C—, —COO—, —OCO—, —OCOO—, —OOCO—, —CF ₂ O—, _{-OCF 2 -, - CH = CHCOO} -, - OCOCH = CH -, - CH 2 -CH 2 COO -, - OCOCH 2 -CH 2 -, - CH = C (CH 3) COO -, - OCOC (CH 3 _{) = CH -, - CH 2} -CH (CH 3) COO -, - OCOCH (CH 3) -CH 2 -, - OCH 2 CH 2 O- or branched or straight-chain alkylene group having 1 to 20 carbon atoms (However, one or two or more non-adjacent —CH ₂ — in the alkylene group may be substituted with —O—, —COO— or —OCO—).

  Since such a first affinity group has a sufficiently high polarity, it exerts a higher affinity (adsorption force) for the substrate.

Each of Sp ₁ , Sp ₂ and Sp ₃ is particularly preferably a single bond or a methylene group.

  Specific examples of the first affinity group include, for example, the substituents shown in the following group.

(In the formula, a black dot represents a bond.)

  Among the above groups, when importance is attached to the chemical stability as the alignment aid, the first affinity group is K1-1, K1-2-1, K1-2-2 and K1-2-3. Is preferred. When the orientation of the liquid crystal molecules is important, K1-2-1, K1-2-2 and K1-2-3 are preferable as the first affinity group.

  When importance is attached to the solubility in the liquid crystal composition, the first affinity group may be K1-2-4, K1-3-1, K1-3-2, K1-3-3, K1. -3-4 and K1-3-5 are preferred. Furthermore, in the case where these balances are considered important, the first affinity group is K1-2-1, K1-2-2, K1-2-3, K1-3-1, K1-3-2, K1-3-3 and K1-3-4 are more preferable.

  On the other hand, the second affinity group preferably contains a group selected from the group represented by the following chemical formula 5, and is selected from the group represented by the following general formulas (K2-1) to (K2-14). Is more preferable.

In formulas (K2-1) to (K2-14), the black dot at the left end represents a bond,
The arbitrary methylene groups are each independently a linear or branched alkyl group having 1 to 5 carbon atoms, a linear or branched alkyloxy group having 1 to 5 carbon atoms, or an alkyl group having 1 to 5 carbon atoms. It may be substituted with a linear or branched perfluoroalkyl group,
W ^K1 represents a methine group, C—CH ₃ , C—C ₂ H ₅ or a nitrogen atom,
X ^K1 and Y ^K1 each independently represent —CH ₂ —, an oxygen atom or a sulfur atom,
Z ^K1 represents an oxygen atom or a sulfur atom.

U ^K1 , V ^K1 and S ^K1 each independently represent a methine group or a nitrogen atom (provided that U ^K1 is a methine group, V ^K1 is a methine group, and S ^K1 is a combination of nitrogen atoms);
R ^K1 represents a hydrogen atom, a linear or branched alkyl group having 1 to 5 carbon atoms, a linear or branched alkyloxy group having 1 to 5 carbon atoms, or a linear or branched chain having 1 to 5 carbon atoms. Represents a perfluoroalkyl group.

  The second compound containing such a second affinity group tends to spread evenly and uniformly on the substrate.

Among the above groups, when importance is attached to chemical stability as the alignment aid, the second affinity group is (K2-1), (K2-3), (K2-8), (K2-9). ) And (K2-13) are preferred. Further, when the orientation of the liquid crystal molecules is important, (K2-1) and (K2-3) are preferable as the second affinity group.
When importance is attached to the solubility in the liquid crystal composition, the second affinity group is preferably (K2-1), (K2-9) and (K2-13). Furthermore, when importance is placed on these balances, (K2-1) and (K2-3) are more preferable as the second affinity group.

  There are various combinations of the first affinity group and the second affinity group, but the first affinity group containing a hydroxyl group and the second affinity group containing an ether group or a carbonate group. A combination with is preferred. By using such a combination of the first affinity group and the second affinity group, the polarity of the second affinity group can be made sufficiently high while the polarity of the first affinity group can be made sufficiently high. It can be sufficiently lower than the polarity of the functional group. Therefore, both the effect of increasing the alignment control force of liquid crystal molecules and the effect of ensuring the storage stability of the liquid crystal composition can be further improved.

  The number of the first affinity group and the number of the second affinity group may each be one, or may be two or more. By setting the numbers of the first affinity group and the second affinity group, the fixing force of the first compound and the second compound on the substrate can be adjusted.

  Further, each of the first compound and the second compound preferably contains at least one polymerizable group. By polymerizing the polymerizable groups with each other, the first compound and the second compound can be more firmly fixed to the substrate, and the holding power of the liquid crystal molecules can be increased. As a result, separation of the liquid crystal layer from the substrate can be prevented or suppressed.

  The number of polymerizable groups may be one or may be plural. By having a plurality of polymerizable groups, the crosslink density of the first compound and the second compound can be increased. Therefore, these can be more firmly fixed to the substrate, and the holding power of the liquid crystal molecules can be further enhanced.

  Such a polymerizable group is, for example, selected from the group represented by the following general formulas (P-1) to (P-13).

(In the formula, the black dot at the right end represents a bond.)

Since these polymerizable groups have high reactivity, they can be polymerized sufficiently and reliably even with relatively low energy (for example, light energy or heat energy). Therefore, when polymerizing the first compound and the second compound, it is possible to prevent or suppress the liquid crystal molecules from being adversely affected and deteriorated.
Among these, as the polymerizable group, groups represented by formulas (P-1) to (P-3) are preferable, and groups represented by formulas (P-1) and (P-3) are more preferable. .

  Each of the first compound and the second compound preferably contains a mesogenic group. As a result, the first affinity group and the second affinity group having a higher polarity than the mesogen group can be adsorbed on the substrate, and the mesogenic group having a low polarity can be more reliably arranged (oriented) away from the substrate.

  When the first compound and the second compound contain a mesogenic group, the affinity between the first compound and the second compound and the liquid crystal molecule becomes higher. Therefore, the alignment regulating force of the liquid crystal molecules by the first compound and the second compound can be further improved.

  The first affinity group, the second affinity group, and the polymerizable group may each be directly bonded to the mesogen group, or may be bonded via the same spacer group as described above. . Further, the position of the mesogenic group to which the polymerizable group is bonded is not particularly limited, but a position close to the first affinity group or the second affinity group is preferable. Thereby, the first compound and the second compound can be polymerized and more firmly fixed to the substrate without adversely affecting the alignment of the liquid crystal molecules. Further, the polymerizable group is preferably bonded laterally to the mesogenic group.

  This mesogenic group is represented by, for example, the following general formula (i).

In the formula (i), the leftmost black dot and the rightmost black dot represent a bond,
A ⁱ¹ represents a divalent 6-membered ring aromatic group, a divalent 6-membered ring heteroaromatic group, a divalent 6-membered ring aliphatic group or a divalent 6-membered ring heteroaliphatic group,
The hydrogen atom in these ring structures is a halogen atom, a linear or branched alkyl group having 1 to 10 carbon atoms, a linear or branched halogenated alkyl group having 1 to 10 carbon atoms, or 1 to 10 carbon atoms. 10 linear or branched alkoxy or ^P i1 ^{-Sp i1} - may be substituted with, ^{where, P i1} is a group represented by the general formula (P-1) ~ (P -13) Represents a polymerizable group selected from the following, Sp ⁱ¹ represents the same meaning as Z ⁱ¹ ,
Z ⁱ¹ is a single bond, —CH═CH—, —CF═CF—, —C≡C—, —COO—, —OCO—, —OCOO—, —OOCO—, —CF ₂ O—, —OCF _{2 -, - CH = CHCOO -,} - OCOCH = CH -, - CH 2 -CH 2 COO -, - OCOCH 2 -CH 2 -, - CH = C (CH 3) COO -, - OCOC (CH 3) = CH _{-, - CH 2 -CH (CH} 3) COO -, - OCOCH (CH 3) -CH 2 -, - OCH 2 CH 2 O- or C2-20 alkylene group (provided that 1 in the alkylene radical Or two or more non-adjacent —CH ₂ — may be substituted with —O—, —COO— or —OCO—),
m ⁱ¹ represents an integer of 1 to 5,
When m ⁱ¹ is 2 or more, the plurality of A ⁱ¹ may be the same or different from each other.

Preferably, Z ⁱ¹ in formula (i) is a single bond, —CH═CH—, —C≡C—, —COO—, —OCO—, —OCOO—, —OOCO—, —CH═CHCOO—, _{-OCOCH = CH -, - CH 2} -CH 2 COO -, - OCOCH 2 -CH 2 -, - CH = C (CH 3) COO -, - OCOC (CH 3) = CH -, - CH 2 -CH ( _{CH 3) COO -, - OCOCH} (CH 3) -CH 2 -, - OCH 2 CH 2 O- or a linear or branched alkylene group having 2 to 20 carbon atoms (provided that 1 in the alkylene radical or 2 nonadjacent or more -CH ₂ - represents may) be replaced by -O-..

More preferably, ^{Z i1} in formula (i) is a single bond, -COO -, - OCO -, - CH = CHCOO -, - OCOCH = CH -, - CH 2 -CH 2 COO -, - OCOCH 2 - _{CH 2 -, - CH = C} (CH 3) COO -, - OCOC (CH 3) = CH -, - CH 2 -CH (CH 3) COO -, - OCOCH (CH 3) -CH 2 -, - OCH ₂ CH ₂ O-, or a linear or branched alkylene group having a carbon number of 2 to 15 (however, not one or adjacent in the alkylene group two or more -CH ₂ - is replaced by -O- May be used).

More preferably, Z ⁱ¹ in formula (i) is a single bond, —CH ₂ —CH ₂ COO—, —OCOCH ₂ —CH ₂ —, —CH═C (CH ₃ ) COO—, —OCOC (CH _{3 ) = CH -, - CH 2} -CH (CH 3) COO -, - OCOCH (CH 3) -CH 2 -, - OCH 2 CH 2 O-, or an alkylene group (ethylene group having a carbon number of 2 (-CH ₂ CH ₂ -)) or -CH ₂ in the ethylene group - one is substituted with -O- group _{(-CH 2 O -, - OCH} 2 -), or a straight chain of carbon atoms from 3 to 13 (Wherein one or two or more non-adjacent —CH ₂ — in the alkylene group may be substituted with —O—).

Preferably, A ⁱ¹ in formula (i) represents a divalent 6-membered aromatic group or a divalent 6-membered aliphatic group. Here, the divalent 6-membered ring aromatic group or the divalent 6-membered ring aliphatic group is a divalent unsubstituted 6-membered ring aromatic group or a divalent unsubstituted 6-membered ring aliphatic group. A hydrogen atom in a group or a ring structure thereof is a halogen atom, a linear or branched alkyl group having 1 to 10 carbon atoms, a linear or branched halogenated alkyl group having 1 to 10 carbon atoms, or 1 carbon atom. 10 linear or branched alkoxy or ^P i1 ^{-Sp i1} - include substituted groups. Here, P ⁱ¹ represents a polymerizable group selected from the group represented by the general formulas (P-1) to (P-13), and Sp ⁱ¹ has the same meaning as Z ⁱ¹ .

Among these, A ⁱ¹ in the formula (i) is a divalent unsubstituted 6-membered aromatic group, a hydrogen atom in the ring structure is a halogen atom (particularly, a fluorine atom), or a C 1-10 carbon atom. linear or branched alkyl group, a linear or branched alkoxy or P ^{i1 -Sp} i1 having 1 to 10 carbon atoms ^- a divalent 6-membered ring aromatic group substituted by, divalent unsubstituted 6 Membered ring aliphatic groups, hydrogen atoms in the ring structure are halogen atoms (especially fluorine atoms), straight-chain or branched alkyl groups having 1 to 10 carbon atoms, straight-chain or branched alkoxy groups having 1 to 10 carbon atoms. Group or a divalent 6-membered cycloaliphatic group substituted with P ⁱ¹ -Sp ⁱ¹ — is preferable, and a hydrogen atom in the ring structure is a halogen atom (particularly, a fluorine atom), the alkyl group, the alkoxy group or P ^i1. -sp ⁱ¹ - it may be replaced by 1,4-off An enylene group, a 2,6-naphthalene group or a 1,4-cyclohexyl group is more preferable.

In addition, ^mi1 preferably represents an integer of 2 to 5, and more preferably an integer of 2 to 4.

Further, the mesogenic group represented by the general formula (i) has a branched structure of trivalent or tetravalent, or trivalent or tetravalent in the middle of the repeating ^unit- (A ⁱ¹ -Z ⁱ¹ )-. It may include an aliphatic or aromatic ring structure of any of the above. In this case, the first compound and the second compound each have a branched structure as a whole.

  Furthermore, it is preferable that the first compound and the second compound each include an end group bonded to the side opposite to the first affinity group or the second affinity group of the mesogenic group. The first compound and the second compound containing the terminal group can be easily arranged (orientated) so that the portion other than the affinity group is separated from the substrate while adsorbing the affinity group on the substrate.

Examples of such an end group include a linear or branched alkyl group having 1 to 40 carbon atoms, a linear or branched halogenated alkyl group having 1 to 40 carbon atoms (provided that the alkyl group or the halogenated alkyl group is is, -CH = CH - - -CH ₂ of, - C≡C -, - O - , - NH -, - COO- or -OCO- may be substituted Although, -O- is not a continuous .) Or a polymerizable group bonded to a mesogenic group directly or via a spacer group.

  The polymerizable group and the spacer group are the same as the above-mentioned polymerizable group and the spacer group, respectively. Since each of the first compound and the second compound contains a polymerizable group as a terminal group, the crosslink density of the first compound and the second compound can be further increased, and the holding power of the liquid crystal molecules in the liquid crystal layer can be increased. Can be further improved.

  Specific examples of the first compound include compounds represented by any of the following formulas (PJ-I-1) to (PJ-I-45).

  On the other hand, specific examples of the second compound include compounds represented by any of the following formulas (PJ-II-1) to (PJ-II-18).

(Liquid crystal composition)
The liquid crystal composition of the present invention contains an alignment aid (first compound and second compound) and liquid crystal molecules, and has a negative dielectric anisotropy (Δε).

  The liquid crystal molecule preferably contains a compound selected from the group represented by the following general formulas (N-1) to (N-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 have 1 to 1 carbon atoms. 8 alkyl groups (provided that one or two or more non-adjacent —CH ₂ — in the alkyl groups are each independently —CH═CH—, —C≡C—, —O—, — CO-, -COO- or -OCO- may be substituted).

A ^N11 , A ^N12 , A ^N21 , A ^N22 , A ^N31 and A ^N32 are each independently,
(A) 1,4-cyclohexylene group (however, one —CH ₂ — present in this group or two or more —CH ₂ — not adjacent to each other may be substituted with —O—. ),
(B) 1,4-phenylene group (however, one -CH = present in this group or two or more -CH = which are not adjacent to each other may be replaced by -N =),
(C) Naphthalene-2,6-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or decahydronaphthalene-2,6-diyl group (however, naphthalene-2,6-diyl group One -CH = present in a group or a 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or two or more non-adjacent -CH = may be substituted with -N = And (d) represents a group selected from the group consisting of 1,4-cyclohexenylene groups,
The group (a), the group (b), the group (c) and the group (d) may each independently be 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 Represents −,
X ^N21 represents a hydrogen atom or a fluorine atom,
T ^N31 is, -CH ₂ - represents an 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 respectively Independently 1, 2 or 3;
When a plurality of A ^{N11 to} A ^N32 and a plurality of Z ^{N11 to} Z ^N32 are present, they may be the same or different from each other.

  The compound of any one of the general formulas (N-1), (N-2) and (N-3) is preferably a compound 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 have 1 to 1 carbon atoms. An alkyl group having 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 is preferable, and an alkyl group having 1 to 5 carbon atoms and a carbon atom More preferably, it is 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 an alkyl group having 1 to 5 carbon atoms or an alkenyl having 2 to 5 carbon atoms. A group is more preferable, an alkyl group having 2 to 5 carbon atoms or an alkenyl group having 2 to 3 carbon atoms is particularly preferable, and an alkenyl group having 3 carbon atoms (propenyl group) is most preferable.

In addition, R ^N11 , R ^N12 , R ^N21 , R ^N22 , R ^N31, and R ^N32 have a linear carbon number of 1 to 5 when the ring structure to which they are bonded is a phenyl group (aromatic). Preferred are alkyl groups, linear alkoxy groups having 1 to 4 carbon atoms and alkenyl groups having 4 to 5 carbon atoms, and the ring structure to which they are bonded is a saturated ring structure such as cyclohexane, pyran and dioxane. Of these, 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 are preferable. In order to stabilize the nematic phase, the total number of carbon atoms and oxygen atoms, if present, is preferably 5 or less, and preferably linear.

  The alkenyl group is preferably selected from the groups represented by any of the formulas (R1) to (R5).

(The black dots in each formula represent a bond.)

A ^N11 , A ^N12 , A ^N21 , A ^N22 , A ^N31 and A ^N32 are each independently preferably an aromatic group for increasing Δn, and an aliphatic group for improving the response speed. It is preferably a group.

  Examples of the aromatic group or aliphatic group include 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 Is more preferable, and the structure represented by the following chemical formula 24 is more preferable, and trans-1,4-cyclohexylene group, 1,4-cyclohexenylene group, or 1,4-phenylene group is more preferable.

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

X ^N21 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 each independently preferably 1 or 2, a combination in which n ^N11 is 1 and n ^N12 is 0, n ^N11 is 2 and n ^N12 is A combination of 0, a combination of n ^N11 of 1 and n ^N12 of 1, a combination of n ^N11 of 2 and n ^N12 of 1, a combination of n ^N21 of 1 and n ^N22 of 0, n ^N21 of More preferred are a combination of 2 and n ^N22 of 0, a combination of n ^N31 of 1 and n ^N32 of 0, and a combination of n ^N31 of 2 and n ^N32 of 0.

  The lower limit of the preferred content of the compound represented by formula (N-1) based on the total amount of the liquid crystal composition is 1% by mass or more, 10% by mass or more, and 20% by mass or more, 30 mass% or more, 40 mass% or more, 50 mass% or more, 55 mass% or more, 60 mass% or more, 65 mass% or more, 70 mass% or more, 75 It is not less than mass% and not less than 80 mass%.

  On the other hand, the upper limit of the preferable content is 95 mass% or less, 85 mass% or less, 75 mass% or less, 65 mass% or less, 55 mass% or less, 45 mass% or less. Is 35 mass% or less, 25 mass% or less, and 20 mass% or less.

  The lower limit of the preferred content of the compound represented by formula (N-2) based on the total amount of the liquid crystal composition is 1% by mass or more, 10% by mass or more, and 20% by mass or more, 30 mass% or more, 40 mass% or more, 50 mass% or more, 55 mass% or more, 60 mass% or more, 65 mass% or more, 70 mass% or more, 75 It is not less than mass% and not less than 80 mass%.

  On the other hand, the upper limit of the preferable content is 95 mass% or less, 85 mass% or less, 75 mass% or less, 65 mass% or less, 55 mass% or less, 45 mass% or less. Is 35 mass% or less, 25 mass% or less, and 20 mass% or less.

  The lower limit of the preferred content of the compound represented by formula (N-3) based on the total amount of the liquid crystal composition is 1% by mass or more, 10% by mass or more, and 20% by mass or more, 30 mass% or more, 40 mass% or more, 50 mass% or more, 55 mass% or more, 60 mass% or more, 65 mass% or more, 70 mass% or more, 75 It is not less than mass% and not less than 80 mass%.

  On the other hand, the upper limit of the preferable content is 95 mass% or less, 85 mass% or less, 75 mass% or less, 65 mass% or less, 55 mass% or less, 45 mass% or less. Is 35 mass% or less, 25 mass% or less, and 20 mass% or less.

  When a liquid crystal composition that keeps the viscosity of the liquid crystal composition low and has a high response speed is required, it is preferable that the lower limit value and the upper limit value are low. Further, when a nematic phase-isotropic liquid phase transition temperature (Tni) of the liquid crystal composition is kept high and a liquid crystal composition having good temperature stability is required, it is preferable that the lower limit value is low and the upper limit value is low. . Further, 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 high and the upper limit value is high.

  Examples of the compound represented by the general formula (N-1) include compounds represented by the following general formulas (N-1a) to (N-1g).

In formulas (N-1a) to (N-1g), R ^N11 and R ^N12 represent the same meaning as R ^N11 and R ^N12 in formula (N-1), n ^Na11 represents 0 or 1, and n ^{Nb11. Represents} 0 or 1, n ^Nc11 represents 0 or 1, n ^Nd11 represents 0 or 1, n ^Ne11 represents 1 or 2, n ^Nf11 represents 1 or 2, and n ^Ng11 represents 1 or 2. A ^Ne11 represents a trans-1,4-cyclohexylene group or a 1,4-phenylene group, and A ^Ng11 represents a trans-1,4-cyclohexylene group, a 1,4-cyclohexenylene group or 1, At least one represents a 4-phenylene group and represents a 1,4-cyclohexenylene group, and Z ^Ne11 represents a single bond or an ethylene group, but at least one represents an ethylene group.

  More specifically, the compound represented by the general formula (N-1) is a compound selected from the group of compounds represented by the general formulas (N-1-1) to (N-1-21). Is preferred.

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

(In the formula, R ^N111 and R ^N112 each independently represent the same meaning as R ^N11 and R ^N12 in the general 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 more preferably a propyl group, a pentyl group or a vinyl group. R ^N112 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 more 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. The kinds of compounds that can be combined are not particularly limited, but they are appropriately combined and used according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, three types, four types, and five or more types in one embodiment.

  When the improvement of Δε is important, it is preferable to set the content higher, when the solubility at low temperature is important, the effect is high when the content is set high, and when the Tni is important, the content is set high. The effect is high when set to a small amount. Further, in the case of improving the dripping mark and the seizure property, it is preferable to set the content range to the middle.

  The lower limit of the preferred content of the compound represented by formula (N-1-1) is 5% by mass or more, 10% by mass or more, and 13% by mass or more based on the total amount of the liquid crystal composition. Yes, 15 mass% or more, 17 mass% or more, 20 mass% or more, 23 mass% or more, 25 mass% or more, 27 mass% or more, 30 mass% or more , 33% by mass or more, and 35% by mass or more.

  On the other hand, the upper limit of the preferable content is 50 mass% or less, 40 mass% or less, 38 mass% or less, 35 mass% or less, 33 mass% or less, 30 mass% or less. 28 mass% or less, 25 mass% or less, 23 mass% or less, 20 mass% or less, 18 mass% or less, 15 mass% or less, 13 mass% or less Yes, 10% by mass or less, 8% by mass or less, 7% by mass or less, 6% by mass or less, 5% by mass or less, and 3% by mass or less.

  Furthermore, the compound represented by the general formula (N-1-1) is a compound selected from the compound group represented by the formula (N-1-1.1) to the formula (N-1-1.22). It is preferable that the compounds represented by formulas (N-1-1.1) to (N-1-1.4) are more preferable, and formulas (N-1-1.1) and formula (N-1-1.1) The compound represented by N-1-1.3) is more preferable.

The compounds represented by the formulas (N-1-1.1) to (N-1-1.22) can be used alone or in combination.
The lower limit of the preferable content of the compounds represented by the formulas (N-1-1.1) to (N-1-1.22) (alone or in combination) is 5 mass with respect to the total amount of the liquid crystal composition. % Or more, 10% by mass or more, 13% by mass or more, 15% by mass or more, 17% by mass or more, 20% by mass or more, 23% by mass or more, 25% by mass It is above, is 27 mass% or more, is 30 mass% or more, is 33 mass% or more, and is 35 mass% or more.

  On the other hand, the upper limit of the preferable content is 50 mass% or less, 40 mass% or less, 38 mass% or less, 35 mass% or less, 33 mass% or less, 30 mass% or less. 28 mass% or less, 25 mass% or less, 23 mass% or less, 20 mass% or less, 18 mass% or less, 15 mass% or less, 13 mass% or less Yes, 10% by mass or less, 8% by mass or less, 7% by mass or less, 6% by mass or less, 5% by mass or less, and 3% by mass or less.

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

R ^N121 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and more preferably an ethyl group, a propyl group, a butyl group or a pentyl group. R ^N122 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 a methyl group, a propyl group, a methoxy group, an ethoxy group or a propoxy group. More 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. The kinds of compounds that can be combined are not particularly limited, but they are appropriately combined and used according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, three types, four types, and five or more types in one embodiment.

  When the improvement of Δε is important, it is preferable to set the content higher. When the solubility at low temperature is important, the effect is high when the content is set low. When the Tni is important, the content is set high. The effect is high when set to a large amount. Further, in the case of improving the dripping mark and the seizure property, it is preferable to set the content range to the middle.

  The lower limit of the preferred content of the compound represented by formula (N-1-2) based on the total amount of the liquid crystal composition is 5% by mass or more, 7% by mass or more, and 10% by mass or more. Yes, 13 mass% or more, 15 mass% or more, 17 mass% or more, 20 mass% or more, 23 mass% or more, 25 mass% or more, 27 mass% or more , 30 mass% or more, 33 mass% or more, 35 mass% or more, 37 mass% or more, 40 mass% or more, 42 mass% or more.

  On the other hand, the upper limit of the preferable content is 50 mass% or less, 48 mass% or less, 45 mass% or less, 43 mass% or less, 40 mass% or less, 38 mass% or less. 35 mass% or less, 33 mass% or less, 30 mass% or less, 28 mass% or less, 25 mass% or less, 23 mass% or less, 20 mass% or less Yes, 18 mass% or less, 15 mass% or less, 13 mass% or less, 10 mass% or less, 8 mass% or less, 7 mass% or less, 6 mass% or less It is 5 mass% or less.

  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-1-2.22). Preferably, there are formula (N-1-2.3) to formula (N-1-2.7), formula (N-1-2.10), formula (N-1-2.11), formula More preferably, it is a compound represented by (N-1-2.13) and formula (N-1-2.20).

  The compounds represented by formulas (N-1-2.3) to (N-1-2.7) are preferable when the improvement of Δε is important, and the compounds of the formula (N-1-2.3) to (N-1-2.7) are preferable when the improvement of Tni is important. (N-1-2.10), compounds represented by formula (N-1-2.11) and formula (N-1-2.13) are preferable, and when importance is attached to improvement in response speed. Is preferably a compound represented by the formula (N-1-2.20).

  The compounds represented by formula (N-1-2.1) to formula (N-1-2.22) can be used alone or in combination.

  The lower limit of the preferable content of the compound represented by formula (N-1-2.1) to formula (N-1-2.22) (alone or in combination) is 5 with respect to the total amount of the liquid crystal composition. Mass% or more, 10 mass% or more, 13 mass% or more, 15 mass% or more, 17 mass% or more, 20 mass% or more, 23 mass% or more, 25 mass % Or more, 27% by mass or more, 30% by mass or more, 33% by mass or more, and 35% by mass or more.

  On the other hand, the upper limit of the preferable content is 50 mass% or less, 40 mass% or less, 38 mass% or less, 35 mass% or less, 33 mass% or less, 30 mass% or less. 28 mass% or less, 25 mass% or less, 23 mass% or less, 20 mass% or less, 18 mass% or less, 15 mass% or less, 13 mass% or less Yes, 10% by mass or less, 8% by mass or less, 7% by mass or less, 6% by mass or less, 5% by mass or less, and 3% by mass or less.

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

(In the formula, R ^N131 and R ^N132 each independently represent the same meaning as R ^N11 and R ^N12 in the general 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 more 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 3 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms, and more preferably a 1-propenyl group, an ethoxy group, a propoxy group or a butoxy group. preferable.

  The compound represented by the general formula (N-1-3) can be used alone, or two or more compounds can be used in combination. The kinds of compounds that can be combined are not particularly limited, but they are appropriately combined and used according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, three types, four types, and five or more types in one embodiment.

  When the improvement of Δε is important, it is preferable to set the content higher, when the solubility at low temperature is important, the effect is high when the content is set high, and when the Tni is important, the content is set high. The effect is high when set to a large amount. Further, in the case of improving the dripping mark and the seizure property, it is preferable to set the content range to the middle.

  The lower limit of the preferred content of the compound represented by formula (N-1-3) based on the total amount of the liquid crystal composition is 5% by mass or more, 10% by mass or more, and 13% by mass or more. Yes, 15% by mass or more, 17% by mass or more, and 20% by mass or more.

  On the other hand, the upper limit of the preferable content is 35% by mass or less, 30% by mass or less, 28% by mass or less, 25% by mass or less, 23% by mass or less, and 20% by mass or less. And 18% by mass or less, 15% by mass or less, and 13% by mass or less.

  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-1-3.21). It is preferable that it is a compound represented by Formula (N-1-3.1) to (N-1-3.7) and Formula (N-1-3.21), N-1-3.1), formula (N-1-3.2), formula (N-1-3.3), formula (N-1-3.4) and formula (N-1-3. The compound represented by 6) is more preferable.

  The compounds represented by formula (N-1-3.1) to formula (N-1-3.4), formula (N-1-3.6) and formula (N-1-3.21) are independent. Although it can be used in combination with each other, it is possible to use a combination of formula (N-1-3.1) and formula (N-1-3.2), formula (N-1-3.3). ), A combination of two or three kinds selected from the formula (N-1-3.4) and the formula (N-1-3.6).

Formula (N-1-3.1) to formula (N-1-3.4), formula (N-1-3.6) and formula (N-1-3. 21) The lower limit of the preferred content of the compound (alone or in combination) is 5% by mass or more, 10% by mass or more, 13% by mass or more, 15% by mass or more, and 17% by mass or more. Yes, and is 20% by mass or more.
On the other hand, the upper limit of the preferable content is 35% by mass or less, 30% by mass or less, 28% by mass or less, 25% by mass or less, 23% by mass or less, and 20% by mass or less. And 18% by mass or less, 15% by mass or less, and 13% by mass or less.

  The compound represented by 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).)

Independently R ^N141 and ^{R N142} are each an alkyl group having 1 to 5 carbon atoms, preferably an alkenyl group or an alkoxy group having 1 to 4 carbon atoms carbon atoms 4-5, methyl group, propyl group, ethoxy More preferred is a group or butoxy group.

  The compound represented by the general formula (N-1-4) can be used alone, or two or more compounds can be used in combination. The kinds of compounds that can be combined are not particularly limited, but they are appropriately combined and used according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, three types, four types, and five or more types in one embodiment.

  When the improvement of Δε is important, it is preferable to set the content higher, when the solubility at low temperature is important, the effect is high when the content is set high, and when the Tni is important, the content is set high. The effect is high when set to a small amount. Further, in the case of improving the dripping mark and the seizure property, it is preferable to set the content range to the middle.

  The lower limit of the preferred content of the compound represented by formula (N-1-4) based on the total amount of the liquid crystal composition is 3% by mass or more, 5% by mass or more, and 7% by mass or more. Yes, 10 mass% or more, 13 mass% or more, 15 mass% or more, 17 mass% or more, 20 mass% or more.

  On the other hand, the upper limit of the preferable content is 35% by mass or less, 30% by mass or less, 28% by mass or less, 25% by mass or less, 23% by mass or less, and 20% by mass or less. , 18 mass% or less, 15 mass% or less, 13 mass% or less, 11 mass% or less, 10 mass% or less, and 8 mass% or less.

  Furthermore, the compound represented by formula (N-1-4) is a compound selected from the group of compounds represented by formula (N-1-4.1) to formula (N-1-4.14). It is preferable that the compounds represented by formulas (N-1-4.1) to (N-1-4.4) are more preferable, and compounds represented by formula (N-1-4.1) and formula (N-1-4.1) are also preferable. N-1 -4.2) and the compounds represented by formula (N-1 -4.4) are more preferable.

  The compounds represented by the formulas (N-1-4.1) to (N-1-4.14) can be used alone or in combination.

  The lower limit of the preferred content of the compounds represented by the formulas (N-1-4.1) to (N-1-4.14) (alone or in combination) is 3 mass with respect to the total amount of the liquid crystal composition. % Or more, 5% by mass or more, 7% by mass or more, 10% by mass or more, 13% by mass or more, 15% by mass or more, 17% by mass or more, 20% by mass That is all.

  On the other hand, the upper limit of the preferable content is 35% by mass or less, 30% by mass or less, 28% by mass or less, 25% by mass or less, 23% by mass or less, and 20% by mass or less. , 18 mass% or less, 15 mass% or less, 13 mass% or less, 11 mass% or less, 10 mass% or less, and 8 mass% or less.

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

R ^N151 and R ^N152 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 , and an ethyl group, a propyl group or butyl. More preferred are groups.

  The compound represented by the general formula (N-1-5) can be used alone, or two or more compounds can be used in combination. The kinds of compounds that can be combined are not particularly limited, but they are appropriately combined and used according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, three types, four types, and five or more types in one embodiment.

  When the improvement of Δε is important, it is preferable to set the content higher. When the solubility at low temperature is important, the effect is high when the content is set low. When the Tni is important, the content is set high. The effect is high when set to a large amount. Further, in the case of improving the dripping mark and the seizure property, it is preferable to set the content range to the middle.

  The lower limit of the preferred content of the compound represented by formula (N-1-5) based on the total amount of the liquid crystal composition is 5% by mass or more, 8% by mass or more, and 10% by mass or more. Yes, 13 mass% or more, 15 mass% or more, 17 mass% or more, 20 mass% or more.

  On the other hand, the upper limit of the preferable content is 35% by mass or less, 33% by mass or less, 30% by mass or less, 28% by mass or less, 25% by mass or less, and 23% by mass or less. 20 mass% or less, 18 mass% or less, 15 mass% or less, and 13 mass% or less.

  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 the compounds are represented by the formula (N-1-5.1), the formula (N-1-5.2) and the compound represented by the formula (N-1-5.4).

The compounds represented by formula (N-1-5.1), formula (N-1-5.2) and formula (N-1-5.4) may be used alone or in combination. Is also possible.
Compounds represented by formula (N-1-5.1), formula (N-1-5.2) and formula (N-1-5.4) with respect to the total amount of the liquid crystal composition (alone or in combination) The lower limit of the preferable content of) is 5 mass% or more, 8 mass% or more, 10 mass% or more, 13 mass% or more, 15 mass% or more, and 17 mass% or more. Yes, and is 20% by mass or more.
On the other hand, the upper limit of the preferable content is 35% by mass or less, 33% by mass or less, 30% by mass or less, 28% by mass or less, 25% by mass or less, and 23% by mass or less. 20 mass% or less, 18 mass% or less, 15 mass% or less, and 13 mass% or less.

  The compound represented by 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 the general 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 more preferably an ethyl group, a propyl group, a butyl group, a vinyl group or a 1-propenyl 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 more 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. The kinds of compounds that can be combined are not particularly limited, but they are appropriately combined and used according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type in one embodiment of the present embodiment, two types, three types, four types, and five or more types.

  When the improvement of Δε is important, it is preferable to set the content higher, when the solubility at low temperature is important, the content is set high to have a high effect, and when the Tni is important, the content is set high. The higher the setting, the better the effect. Further, in the case of improving the dripping mark and the seizure property, it is preferable to set the content range to the middle.

  The lower limit of the preferred content of the compound represented by formula (N-1-10) based on the total amount of the liquid crystal composition is 5% by mass or more, 10% by mass or more, and 13% by mass or more. Yes, 15% by mass or more, 17% by mass or more, and 20% by mass or more.

  On the other hand, the upper limit of the preferable content is 35% by mass or less, 30% by mass or less, 28% by mass or less, 25% by mass or less, 23% by mass or less, and 20% by mass or less. And 18% by mass or less, 15% by mass or less, and 13% by mass or less.

  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-1-10.14). It is preferable that the compounds represented by Formulas (N-1-10.1) to (N-1-10.5) are more preferable, and Formulas (N-1-10.1) and ( N-1-10.2) is more preferable.

The compounds represented by formula (N-1-10.1) and formula (N-1-10.2) can be used alone or in combination.
The lower limit of the preferred content of the compound represented by formula (N-1-10.1) and formula (N-1-10.2) (alone or in combination) is 5 with respect to the total amount of the liquid crystal composition. It is at least mass%, at least 10 mass%, at least 13 mass%, at least 15 mass%, at least 17 mass%, and at least 20 mass%.
On the other hand, the upper limit of the preferable content is 35% by mass or less, 30% by mass or less, 28% by mass or less, 25% by mass or less, 23% by mass or less, and 20% by mass or less. And 18% by mass or less, 15% by mass or less, and 13% by mass or less.

  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 the general 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 more preferably an ethyl group, a propyl group, a butyl group, a vinyl group or a 1-propenyl 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 more 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. The kinds of compounds that can be combined are not particularly limited, but they are appropriately combined and used according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, three types, four types, and five or more types in one embodiment.

  When the improvement of Δε is important, it is preferable to set the content higher, when the solubility at low temperature is important, the content is low, the effect is high, and when the Tni is important, the content is set high. The higher the setting, the better the effect. Further, in the case of improving the dripping mark and the seizure property, it is preferable to set the content range to the middle.

  The lower limit of the preferred content of the compound represented by formula (N-1-11) based on the total amount of the liquid crystal composition is 5% by mass or more, 10% by mass or more, and 13% by mass or more. Yes, 15% by mass or more, 17% by mass or more, and 20% by mass or more.

  On the other hand, the upper limit of the preferable content is 35% by mass or less, 30% by mass or less, 28% by mass or less, 25% by mass or less, 23% by mass or less, and 20% by mass or less. And 18% by mass or less, 15% by mass or less, and 13% by mass or less.

  Furthermore, the compound represented by general formula (N-1-11) is a compound selected from the group of compounds represented by formula (N-1-11.1) to formula (N-1-11.14). The compound represented by formula (N-1-11.2) and formula (N-1-11.4) is more preferable.

  The compounds represented by formula (N-1-11.2) and formula (N-1-11.4) can be used alone or in combination.

  The lower limit of the preferred content of the compound represented by formula (N-1-11.2) and formula (N-1-11.4) (alone or in combination) is 5 with respect to the total amount of the liquid crystal composition. It is at least mass%, at least 10 mass%, at least 13 mass%, at least 15 mass%, at least 17 mass%, and at least 20 mass%.

  On the other hand, the upper limit of the preferable content is 35% by mass or less, 30% by mass or less, 28% by mass or less, 25% by mass or less, 23% by mass or less, and 20% by mass or less. And 18% by mass or less, 15% by mass or less, and 13% by mass or less.

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

(In the formula, R ^N1121 and R ^N1122 each independently represent the same meaning as R ^N11 and R ^N12 in the general formula (N-1).)

R ^N1121 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and more preferably an ethyl group, a propyl group or a butyl group. R ^N1122 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 more 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 in combination of two or more compounds. The kinds of compounds that can be combined are not particularly limited, but they are appropriately combined and used according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, three types, four types, and five or more types in one embodiment.

  When the improvement of Δε is important, it is preferable to set the content higher, when the solubility at low temperature is important, the effect is high when the content is set high, and when the Tni is important, the content is set high. The effect is high when set to a large amount. Further, in the case of improving the dripping mark and the seizure property, it is preferable to set the content range to the middle.

  The lower limit of the preferred content of the compound represented by formula (N-1-12) based on the total amount of the liquid crystal composition is 5% by mass or more, 10% by mass or more, and 13% by mass or more. Yes, 15% by mass or more, 17% by mass or more, and 20% by mass or more.

  On the other hand, the upper limit of the preferable content is 35% by mass or less, 30% by mass or less, 28% by mass or less, 25% by mass or less, 23% by mass or less, and 20% by mass or less. And 18% by mass or less, 15% by mass or less, and 13% by mass or less.

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

(In the formula, R ^N1131 and R ^N1132 each independently represent the same meaning as R ^N11 and R ^N12 in the general 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 more 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 more 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. The kinds of compounds that can be combined are not particularly limited, but they are appropriately combined and used according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, three types, four types, and five or more types in one embodiment.

  When the improvement of Δε is important, it is preferable to set the content higher, when the solubility at low temperature is important, the effect is high when the content is set high, and when the Tni is important, the content is set high. The effect is high when set to a large amount. Further, in the case of improving the dripping mark and the seizure property, it is preferable to set the content range to the middle.

  The lower limit of the preferred content of the compound represented by formula (N-1-13) based on the total amount of the liquid crystal composition is 5% by mass or more, 10% by mass or more, and 13% by mass or more. Yes, 15% by mass or more, 17% by mass or more, and 20% by mass or more.

  On the other hand, the upper limit of the preferable content is 35% by mass or less, 30% by mass or less, 28% by mass or less, 25% by mass or less, 23% by mass or less, and 20% by mass or less. And 18% by mass or less, 15% by mass or less, and 13% by mass or less.

  The compound represented by formula (N-1-14) is the following compound.

(In the formula, R ^N1141 and R ^N1142 each independently represent the same meaning as R ^N11 and R ^N12 in the general formula (N-1).)

R ^N1141 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and more preferably an ethyl group, a propyl group or a butyl group. R ^N1142 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 more preferably an ethoxy group, a propoxy group or a butoxy group.

  The compound represented by the general formula (N-1-14) can be used alone, or two or more compounds can be used in combination. The kinds of compounds that can be combined are not particularly limited, but they are appropriately combined and used according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type in one embodiment of the present embodiment, two types, three types, four types, and five or more types.

  When the improvement of Δε is important, it is preferable to set the content higher, when the solubility at low temperature is important, the effect is high when the content is set high, and when the Tni is important, the content is set high. The effect is high when set to a large amount. Further, in the case of improving the dripping mark and the seizure property, it is preferable to set the content range to the middle.

  The lower limit of the preferred content of the compound represented by formula (N-1-14) based on the total amount of the liquid crystal composition is 5% by mass or more, 10% by mass or more, and 13% by mass or more. Yes, 15% by mass or more, 17% by mass or more, and 20% by mass or more.

  On the other hand, the upper limit of the preferable content is 35% by mass or less, 30% by mass or less, 28% by mass or less, 25% by mass or less, 23% by mass or less, and 20% by mass or less. And 18% by mass or less, 15% by mass or less, and 13% by mass or less.

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

(In the formula, R ^N1151 and R ^N1152 each independently represent the same meaning as R ^N11 and R ^N12 in the general formula (N-1).)

R ^N1151 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and more 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 more 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 in combination of two or more compounds. The kinds of compounds that can be combined are not particularly limited, but they are appropriately combined and used according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, three types, four types, and five or more types in one embodiment.

  When the improvement of Δε is important, it is preferable to set the content higher, when the solubility at low temperature is important, the effect is high when the content is set high, and when the Tni is important, the content is set high. The effect is high when set to a large amount. Further, in the case of improving the dripping mark and the seizure property, it is preferable to set the content range to the middle.

  The lower limit of the preferred content of the compound represented by formula (N-1-15) based on the total amount of the liquid crystal composition is 5% by mass or more, 10% by mass or more, and 13% by mass or more. Yes, 15% by mass or more, 17% by mass or more, and 20% by mass or more.

  On the other hand, the upper limit of the preferable content is 35% by mass or less, 30% by mass or less, 28% by mass or less, 25% by mass or less, 23% by mass or less, and 20% by mass or less. And 18% by mass or less, 15% by mass or less, and 13% by mass or less.

  The compound represented by formula (N-1-16) is the following compound.

(In the formula, R ^N1161 and R ^N1162 each independently represent the same meaning as R ^N11 and R ^N12 in the general formula (N-1).)

R ^N1161 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and more preferably an ethyl group, a propyl group or a butyl group. R ^N1162 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 more preferably an ethoxy group, a propoxy group or a butoxy group.

  The compound represented by formula (N-1-16) can be used alone, or two or more compounds can be used in combination. The kinds of compounds that can be combined are not particularly limited, but they are appropriately combined and used according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, three types, four types, and five or more types in one embodiment.

  When the improvement of Δε is important, it is preferable to set the content higher, when the solubility at low temperature is important, the effect is high when the content is set high, and when the Tni is important, the content is set high. The effect is high when set to a large amount. Further, in the case of improving the dripping mark and the seizure property, it is preferable to set the content range to the middle.

The lower limit of the preferred content of the compound represented by formula (N-1-16) based on the total amount of the liquid crystal composition is 5% by mass or more, 10% by mass or more, and 13% by mass or more. Yes, 15% by mass or more, 17% by mass or more, and 20% by mass or more.
On the other hand, the upper limit of the preferable content is 35% by mass or less, 30% by mass or less, 28% by mass or less, 25% by mass or less, 23% by mass or less, and 20% by mass or less. And 18% by mass or less, 15% by mass or less, and 13% by mass or less.

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

(In the formula, R ^N1171 and R ^N1172 each independently represent the same meaning as R ^N11 and R ^N12 in the general formula (N-1).)

R ^N1171 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and more 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 more 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. The kinds of compounds that can be combined are not particularly limited, but they are appropriately combined and used according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, three types, four types, and five or more types in one embodiment.

  When the improvement of Δε is important, it is preferable to set the content higher, when the solubility at low temperature is important, the effect is high when the content is set high, and when the Tni is important, the content is set high. The effect is high when set to a large amount. Further, in the case of improving the dripping mark and the seizure property, it is preferable to set the content range to the middle.

  The lower limit of the preferred content of the compound represented by formula (N-1-17) based on the total amount of the liquid crystal composition is 5% by mass or more, 10% by mass or more, and 13% by mass or more. Yes, 15% by mass or more, 17% by mass or more, and 20% by mass or more.

  On the other hand, the upper limit of the preferable content is 35% by mass or less, 30% by mass or less, 28% by mass or less, 25% by mass or less, 23% by mass or less, and 20% by mass or less. And 18% by mass or less, 15% by mass or less, and 13% by mass or less.

  The compound represented by the general formula (N-1-18) is the following compound.

(In the formula, R ^N1181 and R ^N1182 each independently represent the same meaning as R ^N11 and R ^N12 in the general formula (N-1).)

R ^N1181 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and more preferably a methyl group, an ethyl group, a propyl group or a butyl group. R ^N1182 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 more preferably an ethoxy group, a propoxy group or a butoxy group.

  The compound represented by the general formula (N-1-18) can be used alone, or two or more compounds can be used in combination. The kinds of compounds that can be combined are not particularly limited, but they are appropriately combined and used according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, three types, four types, and five or more types in one embodiment.

  When the improvement of Δε is important, it is preferable to set the content higher, when the solubility at low temperature is important, the effect is high when the content is set high, and when the Tni is important, the content is set high. The effect is high when set to a large amount. Further, in the case of improving the dripping mark and the seizure property, it is preferable to set the content range to the middle.

  The lower limit of the preferred content of the compound represented by formula (N-1-18) based on the total amount of the liquid crystal composition is 5% by mass or more, 10% by mass or more, and 13% by mass or more. Yes, 15% by mass or more, 17% by mass or more, and 20% by mass or more.

  On the other hand, the upper limit of the preferable content is 35% by mass or less, 30% by mass or less, 28% by mass or less, 25% by mass or less, 23% by mass or less, and 20% by mass or less. And 18% by mass or less, 15% by mass or less, and 13% by mass or less.

  Furthermore, the compound represented by the general formula (N-1-18) is a compound selected from the compound group represented by the formula (N-1-18.1) to the formula (N-1-18.5). It is preferable that the compounds represented by formulas (N-1-18.1) to (N-1-18.3) are more preferable, and formulas (N-1-18.2) and (N-1-18.2) The compound represented by N-1-18.3) is more preferable.

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

R ^N1201 and R ^N1202 are each independently preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and more preferably an ethyl group, a propyl group or a butyl group.

  The compound represented by the general formula (N-1-20) can be used alone, or two or more compounds can be used in combination. The kinds of compounds that can be combined are not particularly limited, but they are appropriately combined and used according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, three types, four types, and five or more types in one embodiment.

  When the improvement of Δε is important, it is preferable to set the content higher, when the solubility at low temperature is important, the effect is high when the content is set high, and when the Tni is important, the content is set high. The effect is high when set to a large amount. Further, in the case of improving the dripping mark and the seizure property, it is preferable to set the content range to the middle.

  The lower limit of the preferred content of the compound represented by formula (N-1-20) based on the total amount of the liquid crystal composition is 5% by mass or more, 10% by mass or more, and 13% by mass or more. Yes, 15% by mass or more, 17% by mass or more, and 20% by mass or more.

  On the other hand, the upper limit of the preferable content is 35% by mass or less, 30% by mass or less, 28% by mass or less, 25% by mass or less, 23% by mass or less, and 20% by mass or less. And 18% by mass or less, 15% by mass or less, and 13% by mass or less.

  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 the general formula (N-1).)

R ^N1211 and R ^N1212 are each independently preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and more preferably an ethyl group, a propyl group or a butyl group.

  The compound represented by formula (N-1-21) may be used alone, or may be used in combination of two or more compounds. The kinds of compounds that can be combined are not particularly limited, but they are appropriately combined and used according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, three types, four types, and five or more types in one embodiment.

  When the improvement of Δε is important, it is preferable to set the content higher, when the solubility at low temperature is important, the effect is high when the content is set high, and when the Tni is important, the content is set high. The effect is high when set to a large amount. Further, in the case of improving the dripping mark and the seizure property, it is preferable to set the content range to the middle.

  The lower limit of the preferred content of the compound represented by formula (N-1-21) is 5% by mass or more, 10% by mass or more, and 13% by mass or more based on the total amount of the liquid crystal composition. Yes, 15% by mass or more, 17% by mass or more, and 20% by mass or more.

  On the other hand, the upper limit of the preferable content is 35% by mass or less, 30% by mass or less, 28% by mass or less, 25% by mass or less, 23% by mass or less, and 20% by mass or less. And 18% by mass or less, 15% by mass or less, and 13% by mass or less.

  The compound represented by the general formula (N-1-22) is the following compound.

(In the formula, R ^N1221 and R ^N1222 each independently represent the same meaning as R ^N11 and R ^N12 in the general formula (N-1).)

R ^N1221 and R ^N1222 are each independently preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and more preferably an ethyl group, a propyl group or a butyl group.

  The compound represented by the general formula (N-1-22) can be used alone, or two or more compounds can be used in combination. The kinds of compounds that can be combined are not particularly limited, but they are appropriately combined and used according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, three types, four types, and five or more types in one embodiment.

  When the improvement of Δε is important, it is preferable to set the content higher, when the solubility at low temperature is important, the effect is high when the content is set high, and when the Tni is important, the content is set high. The effect is high when set to a large amount. Further, in the case of improving the dripping mark and the seizure property, it is preferable to set the content range to the middle.

  The lower limit of the preferred content of the compound represented by formula (N-1-21) is 1% by mass or more, 5% by mass or more, and 10% by mass or more based on the total amount of the liquid crystal composition. Yes, 13% by mass or more, 15% by mass or more, 17% by mass or more, and 20% by mass or more.

  On the other hand, the upper limit of the preferable content is 35% by mass or less, 30% by mass or less, 28% by mass or less, 25% by mass or less, 23% by mass or less, and 20% by mass or less. Is 18 mass% or less, 15 mass% or less, 13 mass% or less, 10 mass% or less, and 5 mass% or less.

  Further, the compound represented by the general formula (N-1-22) is a compound selected from the group of compounds represented by the formula (N-1-22.1) to the formula (N-1-22.12). It is preferable that the compounds are represented by the formulas (N-1-22.1) to (N-1-22.5), and the compounds represented by the formulas (N-1-22.1) to (N-1-22.1) are more preferable. The compound represented by −1−22.4) is more preferable.

  The compound represented by formula (N-3) is preferably a compound selected from the group of compounds represented by formula (N-3-2).

(In the formula, R ^N321 and R ^N322 each independently represent the same meaning as R ^N11 and R ^N12 in the general formula (N-3).)

R ^N321 and R ^N322 are each independently preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and more preferably a propyl group or a pentyl group.

  The compound represented by the general formula (N-3-2) can be used alone, or two or more compounds can be used in combination. The kinds of compounds that can be combined are not particularly limited, but they are appropriately combined and used according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, three types, four types, and five or more types in one embodiment.

  When the improvement of Δε is important, it is preferable to set the content higher, when the solubility at low temperature is important, the effect is high when the content is set high, and when the Tni is important, the content is set high. The effect is high when set to a small amount. Further, in the case of improving the dripping mark and the seizure property, it is preferable to set the content range to the middle.

  The lower limit of the preferred content of the compound represented by formula (N-3-2) based on the total amount of the liquid crystal composition is 3% by mass or more, 5% by mass or more, and 10% by mass or more. Yes, 13 mass% or more, 15 mass% or more, 17 mass% or more, 20 mass% or more, 23 mass% or more, 25 mass% or more, 27 mass% or more , 30 mass% or more, 33 mass% or more, and 35 mass% or more.

  On the other hand, the upper limit of the preferable content is 50 mass% or less, 40 mass% or less, 38 mass% or less, 35 mass% or less, 33 mass% or less, 30 mass% or less. 28 mass% or less, 25 mass% or less, 23 mass% or less, 20 mass% or less, 18 mass% or less, 15 mass% or less, 13 mass% or less Yes, 10% by mass or less, 8% by mass or less, 7% by mass or less, 6% by mass or less, and 5% by mass or less.

  Furthermore, the compound represented by the general formula (N-3-2) is a compound selected from the group of compounds represented by the formula (N-3-2.1) to the formula (N-3-2.3). Preferably there is.

  The liquid crystal molecule may include a compound represented by the following general formula (L).

In formula (L), R ^L1 and R ^L2 are each independently an alkyl group having 1 to 8 carbon atoms (provided that one or two or more —CH ₂ — which are not adjacent to each other in the alkyl group are: Each independently, may be 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 are each independently
(A) 1,4-cyclohexylene group (however, one —CH ₂ — present in this group or two or more —CH ₂ — not adjacent to each other may be substituted with —O—. ),
(B) 1,4-phenylene group (however, one -CH = present in this group or two or more -CH = which are not adjacent to each other may be substituted with -N =), and (C) Naphthalene-2,6-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or decahydronaphthalene-2,6-diyl group (however, naphthalene-2,6-diyl group One -CH = present in a group or a 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or two or more non-adjacent -CH = may be substituted with -N = Good.)
Represents a group selected from the group consisting of
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 = N-N = CH -, - CH = CH -, - represents CF = CF- or -C≡C-,
When n ^L1 is 2 or 3 and a plurality of A ^L2 are present, they may be the same or different from each other, and when n ^L1 is 2 or 3 and a plurality of Z ^L2 are present, They may be the same or different from each other, except for the compounds represented by the general formulas (N-1), (N-2) and (N-3).

  The compound represented by the general formula (L) corresponds to a substantially dielectrically neutral compound (Δε value is −2 to 2). The compounds represented by formula (L) may be used alone or in combination. The kinds of compounds that can be combined are not particularly limited, but they are appropriately combined and used according to desired properties such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The type of compound used is, for example, one type in one embodiment. Alternatively, in another embodiment, there are two types, three types, four types, five types, six types, seven types, eight types, nine types, and ten or more types. is there.

  The amount of the compound represented by the general formula (L) contained in the liquid crystal composition depends on the solubility at low temperature, the transition temperature, the electrical reliability, the birefringence, the process compatibility, the dripping mark, the burn-in, the dielectric property. It is necessary to adjust it appropriately according to the required performance such as rate anisotropy.

  The lower limit of the preferred content of the compound represented by formula (L) relative to the total amount of the liquid crystal composition is 1% by mass or more, 10% by mass or more, 20% by mass or more, and 30% by mass. % Or more, 40% by mass or more, 50% by mass or more, 55% by mass or more, 60% by mass or more, 65% by mass or more, 70% by mass or more, 75% by mass It is above, and is 80 mass% or more.

  On the other hand, the upper limit of the preferable content is 95 mass% or less, 85 mass% or less, 75 mass% or less, 65 mass% or less, 55 mass% or less, 45 mass% or less. And 35% by mass or less and 25% by mass or less.

  When a liquid crystal composition that keeps the viscosity of the liquid crystal composition low and has a high response speed is required, it is preferable that the lower limit value is high and the upper limit value is high. Further, when a liquid crystal composition that maintains a high Tni of the liquid crystal composition and has good temperature stability is required, it is preferable that the lower limit value is high and the upper limit value is high. 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.

Both R ^L1 and R ^L2 are preferably alkyl groups when the reliability is important, and alkoxy groups are preferable when the volatility of the compound is important, and the decrease in viscosity is important. In that case, at least one is preferably an alkenyl group.

  The number of halogen atoms present in the molecule is preferably 0, 1, 2 or 3, and 0 or 1 is preferable, and one is preferable when the compatibility with other liquid crystal molecules is important.

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

  The alkenyl group is preferably selected from the groups represented by any of the formulas (R1) to (R5).

(The black dots in each formula represent a bond.)

n ^L1 is preferably 0 when the response speed is important, 2 or 3 is preferable in order to improve the upper limit temperature of the nematic phase, and 1 is preferable in order to balance these. Further, in order to satisfy the properties required for the liquid crystal 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 in order to improve the response speed, and they 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 -Diyl group or 1,2,3,4-tetrahydronaphthalene-2,6-diyl group is preferable, more preferably the structure of the following chemical formula 56 is represented, and trans-1,4-cyclohexyl is preferable. It is further preferred that represent emissions group or 1,4-phenylene group.

Z ^L1 and Z ^L2 are preferably single bonds when importance is attached to the response speed.

  The compound represented by the general formula (L) preferably has 0 or 1 halogen atom in the molecule.

  The compound represented by formula (L) is preferably a compound selected from the group of compounds represented by formulas (L-1) to (L-7).

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

(In the formula, R ^L11 and R ^L12 each independently represent the same meaning as R ^L1 and R ^L2 in the general formula (L).)

R ^L11 and R ^L12 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 compound represented by the general formula (L-1) can be used alone, or two or more compounds can be used in combination. The kinds of compounds that can be combined are not particularly limited, but they are appropriately combined and used according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, three types, four types, and five or more types in one embodiment.

  The lower limit of the preferred content of the compound represented by formula (L-1) based on the total amount of the liquid crystal composition is 1% by mass or more, 2% by mass or more, and 3% by mass or more, 5 mass% or more, 7 mass% or more, 10 mass% or more, 15 mass% or more, 20 mass% or more, 25 mass% or more, 30 mass% or more, 35 It is at least 40% by mass, at least 40% by mass, at least 45% by mass, at least 50% by mass, and at least 55% by mass.

  On the other hand, the upper limit of the preferable content is 95 mass% or less, 90 mass% or less, 85 mass% or less, 80 mass% or less, 75 mass% or less, 70 mass% or less. , 65 mass% or less, 60 mass% or less, 55 mass% or less, 50 mass% or less, 45 mass% or less, 40 mass% or less, 35 mass% or less Yes, 30% by mass or less and 25% by mass or less.

When a liquid crystal composition that keeps the viscosity of the liquid crystal composition low and has a high response speed is required, it is preferable that the lower limit value is high and the upper limit value is high. Moreover, maintaining high Tni of the liquid crystal composition, it is preferred if a good liquid crystal composition having a temperature stability is required is the upper limit value in the lower limit of the above is moderate is moderate. Further, 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 General Formula (L-1) is preferably a compound selected from the group of compounds represented by General Formula (L-1-1).

(In the formula, R ^L12 has the same meaning as in the general formula (L-1).)

  The compound represented by General Formula (L-1-1) is a compound selected from the group of compounds represented by Formula (L-1-1.1) to Formula (L-1-1.3). Is more preferable, and a compound represented by the formula (L-1-1.2) or the formula (L-1-1.3) is more preferable, and a compound represented by the formula (L-1-1.3) is particularly preferable. Preferably, the compound is

  The lower limit of the preferred content of the compound represented by formula (L-1-1.3) based on the total amount of the liquid crystal composition is 1% by mass or more, 2% by mass or more, and 3% by mass. The above is 5% by mass or more, 7% by mass or more, and 10% by mass or more.

  On the other hand, the upper limit of the preferable content is 20 mass% or less, 15 mass% or less, 13 mass% or less, 10 mass% or less, 8 mass% or less, 7 mass% or less. And 6% by mass or less, 5% by mass or less, and 3% by mass or less.

  The compound represented by General Formula (L-1) is preferably a compound selected from the group of compounds represented by General Formula (L-1-2).

(In the formula, R ^L12 has the same meaning as in the general formula (L-1).)

  The lower limit of the preferred content of the compound represented by formula (L-1-2) based on the total amount of the liquid crystal composition is 1% by mass or more, 5% by mass or more, and 10% by mass or more. Yes, 15 mass% or more, 17 mass% or more, 20 mass% or more, 23 mass% or more, 25 mass% or more, 27 mass% or more, 30 mass% or more , 35 mass% or more.

  On the other hand, the upper limit of the preferable content is 60 mass% or less, 55 mass% or less, 50 mass% or less, 45 mass% or less, 42 mass% or less, 40 mass% or less. Is 38 mass% or less, 35 mass% or less, 33 mass% or less, and 30 mass% or less.

Furthermore, the compound represented by General Formula (L-1-2) is a compound selected from the group of compounds represented by Formula (L-1-2.1) to Formula (L-1-2.4). The compound represented by formula (L-1-2.2) to formula (L-1-2.4) is more preferable. In particular, the compound represented by the formula (L-1-2.2) is preferable because it improves the response speed of the liquid crystal composition. Moreover, when obtaining Tni higher than a response speed, it is preferable to use the compound represented by Formula (L-1-2.3) or Formula (L-1-2.4).
The amount of the compound represented by the formula (L-1-2.3) and the formula (L-1-2.4) contained in the liquid crystal composition is 30% by mass in order to improve the solubility at low temperature. % Or more is not preferable.

  The lower limit of the preferred content of the compound represented by formula (L-1-2.2) is 10% by mass or more, 15% by mass or more, and 18% by mass with respect to the total amount of the liquid crystal composition. Or more, 20% by mass or more, 23% by mass or more, 25% by mass or more, 27% by mass or more, 30% by mass or more, 33% by mass or more, 35% by mass or more And 38% by mass or more and 40% by mass or more.

  On the other hand, the upper limit of the preferable content is 60 mass% or less, 55 mass% or less, 50 mass% or less, 45 mass% or less, 43 mass% or less, 40 mass% or less. , 38 mass% or less, 35 mass% or less, 32 mass% or less, 30 mass% or less, 27 mass% or less, 25 mass% or less, 22 mass% or less is there.

  The lower limit of the preferable total content of the compound represented by the formula (L-1-2.3) and the compound represented by the formula (L-1-2.4) with respect to the total amount of the liquid crystal composition is 10 mass% or more, 15 mass% or more, 20 mass% or more, 25 mass% or more, 27 mass% or more, 30 mass% or more, 35 mass% or more, It is 40% by mass or more.

  On the other hand, the upper limit of the preferable content is 60 mass% or less, 55 mass% or less, 50 mass% or less, 45 mass% or less, 43 mass% or less, 40 mass% or less. , 38 mass% or less, 35 mass% or less, 32 mass% or less, 30 mass% or less, 27 mass% or less, 25 mass% or less, 22 mass% or less is there.

  The compound represented by formula (L-1) is preferably a compound selected from the group of compounds represented by formula (L-1-3).

(In the formula, R ^L13 and R ^L14 each independently represent an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an alkenyl group having 2 to 8 carbon atoms.)

R ^L13 and R ^L14 each independently represent a linear alkyl group having 1 to 5 carbon atoms, a linear alkoxy group having 1 to 4 carbon atoms, or a linear alkyl group having 2 to 5 carbon atoms. Alkenyl groups are preferred.

  The lower limit of the preferred content of the compound represented by formula (L-1-3) based on the total amount of the liquid crystal composition is 1% by mass or more, 5% by mass or more, and 10% by mass or more. Yes, 13 mass% or more, 15 mass% or more, 17 mass% or more, 20 mass% or more, 23 mass% or more, 25 mass% or more, 30 mass% or more .

  On the other hand, the upper limit of the preferable content is 60% by mass or less, 55% by mass or less, 50% by mass or less, 45% by mass or less, 40% by mass or less, and 37% by mass or less. 35 mass% or less, 33 mass% or less, 30 mass% or less, 27 mass% or less, 25 mass% or less, 23 mass% or less, 20 mass% or less Yes, 17% by mass or less, 15% by mass or less, 13% by mass or less, and 10% by mass or less.

Furthermore, the compound represented by General Formula (L-1-3) is a compound selected from the group of compounds represented by Formula (L-1-3.1) to Formula (L-1-3.13). It is preferable that it is a compound represented by Formula (L-1-3.1), Formula (L-1-3.3), or Formula (L-1-3.4). In particular, the compound represented by the formula (L-1-3.1) is preferable because it improves the response speed of the liquid crystal composition. Further, when obtaining Tni higher than the response speed, the equation (L-1-3.3), the equation (L-1-3.4), the equation (L-1-3.11) and the equation (L- It is preferable to use the compound represented by 1-3.12).
Note that the formula (L-1-3.3), the formula (L-1-3.4), the formula (L-1-3.11), and the formula (L-1-3. The total amount of the compounds represented by 12) is not preferably 20% or more in order to improve the solubility at low temperature.

  The lower limit of the preferred content of the compound represented by formula (L-1-3.1) based on the total amount of the liquid crystal composition is 1% by mass or more, 2% by mass or more, and 3% by mass. Or more, 5% by mass or more, 7% by mass or more, 10% by mass or more, 13% by mass or more, 15% by mass or more, 18% by mass or more, 20% by mass or more Is.

  On the other hand, the upper limit of the preferable content is 20 mass% or less, 17 mass% or less, 15 mass% or less, 13 mass% or less, 10 mass% or less, 8 mass% or less. And 7% by mass or less and 6% by mass or less.

  The compound represented by formula (L-1) is preferably a compound selected from the group of compounds represented by formula (L-1-4) and / or (L-1-5).

(In the formula, R ^L15 and R ^L16 each independently represent an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an alkenyl group having 2 to 8 carbon atoms.)

R ^L15 and R ^L16 each independently represent a linear alkyl group having 1 to 5 carbon atoms, a linear alkoxy group having 1 to 4 carbon atoms, or a linear alkyl group having 2 to 5 carbon atoms. Alkenyl groups are preferred.

  The lower limit of the preferred content of the compound represented by formula (L-1-4) based on the total amount of the liquid crystal composition is 1% by mass or more, 5% by mass or more, and 10% by mass or more. Yes, 13 mass% or more, 15 mass% or more, 17 mass% or more, 20 mass% or more.

  On the other hand, the upper limit of the preferable content is 25 mass% or less, 23 mass% or less, 20 mass% or less, 17 mass% or less, 15 mass% or less, 13 mass% or less. And is 10 mass% or less.

  The lower limit of the preferred content of the compound represented by formula (L-1-5) based on the total amount of the liquid crystal composition is 1% by mass or more, 5% by mass or more, and 10% by mass or more. Yes, 13 mass% or more, 15 mass% or more, 17 mass% or more, 20 mass% or more.

  On the other hand, the upper limit of the preferable content is 25 mass% or less, 23 mass% or less, 20 mass% or less, 17 mass% or less, 15 mass% or less, 13 mass% or less. And is 10 mass% or less.

  Furthermore, the compounds represented by the general formulas (L-1-4) and (L-1-5) are represented by the formula (L-1-4.1) to the formula (L-1-4.3) and the formula (L-1-4.3). It is preferably a compound selected from the group of compounds represented by L-1-5.1) to formula (L-1-5.3), and is represented by formula (L-1-4.2) or formula (L- The compound represented by 1-5.2) is more preferable.

  The lower limit of the preferred content of the compound represented by formula (L-1-4.2) is 1% by mass or more, 2% by mass or more, and 3% by mass with respect to the total amount of the liquid crystal composition. Or more, 5% by mass or more, 7% by mass or more, 10% by mass or more, 13% by mass or more, 15% by mass or more, 18% by mass or more, 20% by mass or more Is.

  On the other hand, the upper limit of the preferable content is 20 mass% or less, 17 mass% or less, 15 mass% or less, 13 mass% or less, 10 mass% or less, 8 mass% or less. And 7% by mass or less and 6% by mass or less.

  Formula (L-1-1.3), Formula (L-1-2.2), Formula (L-1-3.1), Formula (L-1-3.3), Formula (L-1-) It is preferable to combine two or more compounds selected from the compounds represented by formula 3.4), formula (L-1-3.11) and formula (L-1-3.12), and formula (L-1 -1.3), formula (L-1-2.2), formula (L-1-3.1), formula (L-1-3.3), formula (L-1-3.4) and It is more preferable to combine two or more compounds selected from the compounds represented by formula (L-1-4.2).

The lower limit of the preferred total content of these compounds relative to the total amount of the liquid crystal composition is 1% by mass or more, 2% by mass or more, 3% by mass or more, and 5% by mass or more, 7 mass% or more, 10 mass% or more, 13 mass% or more, 15 mass% or more, 18 mass% or more, 20 mass% or more, 23 mass% or more, 25 It is at least mass%, at least 27 mass%, at least 30 mass%, at least 33 mass%, and at least 35 mass%.
On the other hand, the upper limit of the preferable total content is 80 mass% or less, 70 mass% or less, 60 mass% or less, 50 mass% or less, 45 mass% or less, 40 mass% % Or less, 37% by mass or less, 35% by mass or less, 33% by mass or less, 30% by mass or less, 28% by mass or less, 25% by mass or less, 23% by mass It is below, and it is below 20 mass%.

  When importance is placed on the reliability of the liquid crystal composition, the compounds represented by formula (L-1-3.1), formula (L-1-3.3) and formula (L-1-3.4) It is preferable to combine two or more compounds selected from the following, and when importance is attached to the response speed of the liquid crystal composition, the compounds are represented by the formula (L-1-1.3) and the formula (L-1-2.2). It is preferable to combine two or more compounds selected from the above compounds.

  The compound represented by General Formula (L-1) is preferably a compound selected from the group of compounds represented by General Formula (L-1-6).

(In the formula, R ^L17 and R ^L18 each independently represent a methyl group or a hydrogen atom.)

  The lower limit of the preferred content of the compound represented by formula (L-1-6) based on the total amount of the liquid crystal composition is 1% by mass or more, 5% by mass or more, and 10% by mass or more. Yes, 15 mass% or more, 17 mass% or more, 20 mass% or more, 23 mass% or more, 25 mass% or more, 27 mass% or more, 30 mass% or more , 35 mass% or more.

  On the other hand, the upper limit of the preferable content is 60 mass% or less, 55 mass% or less, 50 mass% or less, 45 mass% or less, 42 mass% or less, 40 mass% or less. Is 38 mass% or less, 35 mass% or less, 33 mass% or less, and 30 mass% or less.

  Further, the compound represented by the general formula (L-1-6) is a compound selected from the group of compounds represented by the formula (L-1-6.1) to the formula (L-1-6.3). Preferably there is.

  The compound represented by 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. The alkoxy groups of the numbers 1 to 4 are preferred.

  The compound represented by the general formula (L-2) can be used alone, or two or more compounds can be used in combination. The kinds of compounds that can be combined are not particularly limited, but they are appropriately combined and used according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, three types, four types, and five or more types in one embodiment.

  When the solubility at low temperature is important, a large content is effective, and when the response speed is important, a small content is effective. Further, in the case of improving the dripping mark and the seizure property, it is preferable to set the content range to the middle.

  The lower limit of the preferred content of the compound represented by formula (L-2) based on the total amount of the liquid crystal composition is 1% by mass or more, 2% by mass or more, and 3% by mass or more, It is 5 mass% or more, 7 mass% or more, and 10 mass% or more.

  On the other hand, the upper limit of the preferable content is 20 mass% or less, 15 mass% or less, 13 mass% or less, 10 mass% or less, 8 mass% or less, 7 mass% or less. And 6% by mass or less, 5% by mass or less, and 3% by mass or less.

  Furthermore, the compound represented by General Formula (L-2) is preferably a compound selected from the group of compounds represented by Formula (L-2.1) to Formula (L-2.6), The compounds represented by formula (L-2.1), formula (L-2.3), formula (L-2.4) and formula (L-2.6) are more preferred.

  The compound represented by 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 the 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. The kinds of compounds that can be combined are not particularly limited, but they are appropriately combined and used according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, three types, four types, and five or more types in one embodiment.

  The lower limit of the preferred content of the compound represented by formula (L-3) based on the total amount of the liquid crystal composition is 1% by mass or more, 2% by mass or more, and 3% by mass or more, It is 5 mass% or more, 7 mass% or more, and 10 mass% or more.

  On the other hand, the upper limit of the preferable content is 20 mass% or less, 15 mass% or less, 13 mass% or less, 10 mass% or less, 8 mass% or less, 7 mass% or less. And 6% by mass or less, 5% by mass or less, and 3% by mass or less.

  When a high birefringence is obtained, the effect is high when the content is set high. On the contrary, when the high Tni is important, the effect is high when the content is set low. Further, in the case of improving the dripping mark and the seizure property, it is preferable to set the content range to the middle.

  Furthermore, the compound represented by the general formula (L-3) is preferably a compound selected from the group of compounds represented by the formula (L-3.1) to the formula (L-3.7), More preferably, it is a compound represented by formula (L-3.2) to formula (L-3.7).

  The compound represented by 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 the 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. The alkoxy groups of the numbers 1 to 4 are preferred.

  The compound represented by the general formula (L-4) can be used alone, or two or more compounds can be used in combination. The kinds of compounds that can be combined are not particularly limited, but they are appropriately combined and used according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, three types, four types, and five or more types in one embodiment.

  In the liquid crystal composition, the content of the compound represented by the general formula (L-4) is such that the solubility at low temperature, the transition temperature, the electrical reliability, the birefringence, the process compatibility, the dripping mark, the burn-in, It is necessary to appropriately adjust according to the required performance such as dielectric anisotropy.

  The lower limit of the preferred content of the compound represented by formula (L-4) based on the total amount of the liquid crystal composition is 1% by mass or more, 2% by mass or more, and 3% by mass or more, 5 mass% or more, 7 mass% or more, 10 mass% or more, 14 mass% or more, 16 mass% or more, 20 mass% or more, 23 mass% or more, 26 It is at least mass%, at least 30 mass%, at least 35 mass%, and at least 40 mass%.

  On the other hand, the upper limit of the preferable content is 50 mass% or less, 40 mass% or less, 35 mass% or less, 30 mass% or less, 20 mass% or less, 15 mass% or less. And 10% by mass or less and 5% by mass or less.

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

  Depending on the required properties such as solubility at low temperature, transition temperature, electrical reliability, and birefringence, even if the compound represented by formula (L-4.1) is contained, -4.2), it contains both the compound represented by formula (L-4.1) and the compound represented by formula (L-4.2). Or may include all the compounds represented by Formula (L-4.1) to Formula (L-4.3).

  The lower limit of the preferred content of the compound represented by formula (L-4.1) or formula (L-4.2) is 3% by mass or more and 5% by mass with respect to the total amount of the liquid crystal composition. Or more, 7% by mass or more, 9% by mass or more, 11% by mass or more, 12% by mass or more, 13% by mass or more, 18% by mass or more, 21% by mass or more Is.

  On the other hand, the upper limit of the preferable content is 45% by mass or less, 40% by mass or less, 35% by mass or less, 30% by mass or less, 25% by mass or less, and 23% by mass or less. 20% by mass or less, 18% by mass or less, 15% by mass or less, 13% by mass or less, 10% by mass or less, and 8% by mass or less.

  When both the compound represented by the formula (L-4.1) and the compound represented by the formula (L-4.2) are contained, it is preferable that both compounds are contained with respect to the total amount of the liquid crystal composition. The lower limit of the amount is 15% by mass or more, 19% by mass or more, 24% by mass or more, and 30% by mass or more.

  On the other hand, the upper limit of the preferable content is 45% by mass or less, 40% by mass or less, 35% by mass or less, 30% by mass or less, 25% by mass or less, and 23% by mass or less. 20 mass% or less, 18 mass% or less, 15 mass% or less, and 13 mass% or less.

  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), and the compound represented by the formula (L-4.4). It is more preferable that the compound is

  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-4.4) is contained, -4.5), it contains both the compound represented by formula (L-4.4) and the compound represented by formula (L-4.5). May be.

  The lower limit of the preferred content of the compound represented by formula (L-4.4) or formula (L-4.5) is 3% by mass or more and 5% by mass with respect to the total amount of the liquid crystal composition. Or more, 7% by mass or more, 9% by mass or more, 11% by mass or more, 12% by mass or more, 13% by mass or more, 18% by mass or more, 21% by mass or more Is.

  On the other hand, the preferable upper limit value is 45 mass% or less, 40 mass% or less, 35 mass% or less, 30 mass% or less, 25 mass% or less, 23 mass% or less, It is 20 mass% or less, 18 mass% or less, 15 mass% or less, 13 mass% or less, 10 mass% or less, and 8 mass% or less.

  When both the compound represented by the formula (L-4.4) and the compound represented by the formula (L-4.5) are contained, the both compounds are preferably contained in the total amount of the liquid crystal composition. The lower limit of the amount is 15% by mass or more, 19% by mass or more, 24% by mass or more, and 30% by mass or more.

  On the other hand, the preferable upper limit value is 45 mass% or less, 40 mass% or less, 35 mass% or less, 30 mass% or less, 25 mass% or less, 23 mass% or less, It is 20 mass% or less, 18 mass% or less, 15 mass% or less, and 13 mass% or less.

  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 compound represented by the formula (L-4. The compound represented by 9) is preferable.

  The compound represented by 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. The alkoxy groups of the numbers 1 to 4 are preferred.

  The compound represented by the general formula (L-5) can be used alone, or two or more compounds can be used in combination. The kinds of compounds that can be combined are not particularly limited, but they are appropriately combined and used according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, three types, four types, and five or more types in one embodiment.

  In the liquid crystal composition, the content of the compound represented by the general formula (L-5) is such that the solubility at low temperature, the transition temperature, the electrical reliability, the birefringence, the process compatibility, the dripping mark, the burn-in, It is necessary to appropriately adjust according to the required performance such as dielectric anisotropy.

  The lower limit of the preferred content of the compound represented by formula (L-5) based on the total amount of the liquid crystal composition is 1% by mass or more, 2% by mass or more, and 3% by mass or more, 5 mass% or more, 7 mass% or more, 10 mass% or more, 14 mass% or more, 16 mass% or more, 20 mass% or more, 23 mass% or more, 26 It is at least mass%, at least 30 mass%, at least 35 mass%, and at least 40 mass%.

  On the other hand, the upper limit of the preferable content is 50 mass% or less, 40 mass% or less, 35 mass% or less, 30 mass% or less, 20 mass% or less, 15 mass% or less. And 10% by mass or less and 5% by mass or less.

  The compound represented by the general formula (L-5) is preferably a compound represented by the formula (L-5.1) or the formula (L-5.2), and particularly, the compound represented by the formula (L-5. It is preferably a compound represented by 1).

The lower limit of the preferred content of these compounds relative to the total amount of the liquid crystal composition is 1% by mass or more, 2% by mass or more, 3% by mass or more, 5% by mass or more, 7% by mass. % Or more.
On the other hand, the upper limit of the preferable content is 20 mass% or less, 15 mass% or less, 13 mass% or less, 10 mass% or less, and 9 mass% or less.

  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 preferred content of these compounds relative to the total amount of the liquid crystal composition is 1% by mass or more, 2% by mass or more, 3% by mass or more, 5% by mass or more, 7% by mass. % Or more.

  On the other hand, the upper limit of the preferable content is 20 mass% or less, 15 mass% or less, 13 mass% or less, 10 mass% or less, and 9 mass% or less.

  The compound represented by formula (L-5) is preferably a compound selected from the group of compounds represented by formula (L-5.5) to formula (L-5.7), and particularly preferably a compound represented by formula (L-5.5): It is preferably a compound represented by L-5.7).

The lower limit of the preferred content of these compounds relative to the total amount of the liquid crystal composition is 1% by mass or more, 2% by mass or more, 3% by mass or more, 5% by mass or more, 7% by mass. % Or more.
On the other hand, the upper limit of the preferable content is 20 mass% or less, 15 mass% or less, 13 mass% or less, 10 mass% or less, and 9 mass% or less.

  The compound represented by 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 ^{XL 62} is a fluorine atom and the other is a hydrogen atom. It is preferable.

  The compound represented by the general formula (L-6) can be used alone, or two or more compounds can be used in combination. The kinds of compounds that can be combined are not particularly limited, but they are appropriately combined and used according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, three types, four types, and five or more types in one embodiment.

  The lower limit of the preferred content of the compound represented by formula (L-6) based on the total amount of the liquid crystal composition is 1% by mass or more, 2% by mass or more, and 3% by mass or more, 5 mass% or more, 7 mass% or more, 10 mass% or more, 14 mass% or more, 16 mass% or more, 20 mass% or more, 23 mass% or more, 26 It is at least mass%, at least 30 mass%, at least 35 mass%, and at least 40 mass%.

  On the other hand, the upper limit of the preferable content is 50 mass% or less, 40 mass% or less, 35 mass% or less, 30 mass% or less, 20 mass% or less, 15 mass% or less. And 10% by mass or less and 5% by mass or less.

  It should be noted that when the emphasis is placed on increasing Δn, the content is preferably increased, and when the focus is on precipitation at low temperature, the content is preferably small.

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

  The kinds of compounds that can be combined are not particularly limited, but it is preferable to contain 1 to 3 kinds of these compounds, and it is more preferable to contain 1 to 4 kinds. In addition, since the compound having a wide molecular weight distribution is also effective for solubility, for example, one kind of the compound represented by the formula (L-6.1) or (L-6.2) or the compound represented by the formula (L-6.2) is used. 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 the formula (L-6.7), and one type represented by the formula (L It is preferable to select one kind of compound from the compounds represented by -6.8) or (L-6.9) and combine these appropriately. Among them, it is represented by the formula (L-6.1), the formula (L-6.3), the formula (L-6.4), the formula (L-6.6) and the formula (L-6.9). It is preferable to include a compound.

  Further, the compound represented by the general formula (L-6) is preferably a compound represented by the formula (L-6.10) to the formula (L-6.17), and among them, More preferably, it is the compound represented by L-6.11).

The lower limit of the preferred content of these compounds relative to the total amount of the liquid crystal composition is 1% by mass or more, 2% by mass or more, 3% by mass or more, 5% by mass or more, 7% by mass. % Or more.
On the other hand, the upper limit of the preferable content is 20 mass% or less, 15 mass% or less, 13 mass% or less, 10 mass% or less, and 9 mass% or less.

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

(In the formula, R ^L71 and R ^L72 each independently represent the same meaning as R ^L1 and R ^L2 in the general formula (L), and A ^L71 and A ^L72 are each independently A ^L2 in the general formula (L) and It has the same meaning as A ^L3 , but the hydrogen atoms on A ^L71 and A ^L72 may each independently be replaced by a fluorine atom, and Z ^L71 has 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 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 by a fluorine atom, and Z ^L71 is a single group. A bond or COO- is preferred, a single bond is preferred, and X ^L71 and ^{XL 72} are preferably hydrogen atoms.

  The types of compounds that can be combined are not particularly limited, but they are combined according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, three types, and four types in one embodiment.

  The amount of the compound represented by the general formula (L-7) contained in the liquid crystal composition depends on the solubility at low temperature, the transition temperature, the electrical reliability, the birefringence, the process compatibility, the dripping mark, and the burn-in. It is necessary to appropriately adjust according to the required performance such as dielectric anisotropy.

  The lower limit of the preferred content of the compound represented by formula (L-7) based on the total amount of the liquid crystal composition is 1% by mass or more, 2% by mass or more, and 3% by mass or more, It is 5 mass% or more, 7 mass% or more, 10 mass% or more, 14 mass% or more, 16 mass% or more, and 20 mass% or more.

  On the other hand, the upper limit of the preferable content is 30 mass% or less, 25 mass% or less, 23 mass% or less, 20 mass% or less, 18 mass% or less, 15 mass% or less. And 10% by mass or less and 5% by mass or less.

  When a high Tni of the liquid crystal composition is desired, the content of the compound represented by the formula (L-7) is preferably increased, and when a low viscosity liquid crystal composition is desired, the content is decreased. It is preferable.

  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 compound represented by the formula (L-7. More preferably, it is the 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), and the compound represented by the formula (L-7. The compound represented by 11) is more preferable.

  Furthermore, the compound represented by the general formula (L-7) is preferably a compound represented by the formula (L-7.21) to the formula (L-7.23), and the compound represented by the formula (L-7. The compound represented by 21) is more preferable.

  Furthermore, the compound represented by General Formula (L-7) is preferably a compound represented by Formula (L-7.31) to Formula (L-7.34), and formula (L-7. 31) or / and a compound represented by the formula (L-7.32) are more preferable.

  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 compound represented by the formula (L-7. 41) and / or a compound represented by the formula (L-7.42) is more preferred.

  Furthermore, the compound represented by General Formula (L-7) is preferably a compound represented by Formula (L-7.51) to Formula (L-7.53).

  The liquid crystal composition of the present invention may further contain a polymerizable compound. Examples of the polymerizable compound include various compounds, but it is preferable that the polymerizable compound contains at least one compound represented by the following general formula (P).

In formula (P), Z ^p1 is a fluorine atom, a cyano group, a hydrogen atom, an alkyl group having 1 to 15 carbon atoms in which the hydrogen atom may be replaced by a halogen atom, or a hydrogen atom is replaced by a halogen atom. Optionally an alkoxy group having 1 to 15 carbon atoms, an alkenyl group having 1 to 15 carbon atoms in which a hydrogen atom may be replaced by a halogen atom, and a number of carbon atoms in which a hydrogen atom may be replaced by a halogen atom. 1 to 15 represents an alkenyloxy group or -Sp ^p2- R ^p2 .

R ^p1 and R ^p2 each represent any of the following formulas (R-I) to formula (R-IX).

(In the formula,
Binds to Sp ^p1 or Sp ^p2 at *,
R ^{2 to} R ⁶ each independently represent a hydrogen atom, an alkyl group having 1 to 5 carbon atoms or a halogenated alkyl group having 1 to 5 carbon atoms,
W represents a single bond, -O- or a methylene group,
T represents a single bond or -COO-,
p, t, and q each independently represent 0, 1, or 2. )

Sp ^p1 and Sp ^p2 each represent a spacer group,
L ^p1 and L ^p2 are each independently a single bond, —O—, —S—, —CH ₂ —, —OCH ₂ —, —CH ₂ O—, —CO—, —C ₂ H ₄ —, _{-COO -, - OCO -, -} OCOOCH 2 -, - CH 2 OCOO -, - OCH 2 CH 2 O -, - CO-NR a -, - NR a -CO -, - SCH 2 -, - CH 2 S ^{-, - CH = CR a -COO} -, - CH = CR a -OCO -, - COO-CR a = CH -, - OCO-CR a = CH -, - COO-CR a = CH-COO -, - ^{COO-CR a = CH-OCO} -, - OCO-CR a = CH-COO -, - OCO-CR a = CH-OCO -, - (CH 2) z -C (= O) -O -, - ( _{CH 2) z -O- (C =} O) -, - O- (C = O) - (CH 2) z -, - (C = O _{-O- (CH 2) z -,} - CH 2 (CH 3) C-C (= O) -O -, - CH 2 (CH 3) C-O- (C = O) -, - O- ( _{C = O) -C (CH 3} ) CH 2, - (C = O) -O-C (CH 3) -CH 2, -CH = CH -, - CF = CF -, - CF = CH -, - _{CH = CF -, - CF 2} -, - CF 2 O -, - OCF 2 -, - CF 2 CH 2 -, - CH 2 CF 2 -, - CF 2 CF 2 - or -C≡C- (provided that In the formula, each R ^a independently represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and z represents an integer of 1 to 4).

M ^p2 is a 1,4-phenylene group, a 1,4-cyclohexylene group, an anthracene-2,6-diyl group, a phenanthrene-2,7-diyl group, a pyridine-2,5-diyl group, a pyrimidine-2, 5-diyl group, naphthalene-2,6-diyl group, indane-2,5-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, 1,3-dioxane-2,5 Represents a diyl group or a single bond, M ^p2 is unsubstituted or is an alkyl group having 1 to 12 carbon atoms, a halogenated alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms. It may be substituted with a halogenated alkoxy group having 1 to 12 carbon atoms, a halogen atom, a cyano group, a nitro group or -R ^p1 .

M ^p1 represents any one of the following formulas (i-11) to (ix-11).

(In the formula, * binds to Sp ^p1 and ** binds to L ^p1 , L ^p2, or Z ^p1 .)

M ^p3 represents any one of the following formulas (i-13) to (ix-13).

(In the formula, * binds to Z ^p1 and ** binds to L ^p2 .)

m ^{p2 to} m ^p4 each independently represent 0, 1, 2 or 3.
m ^p1 and m ^p5 each independently represent 1, 2 or 3,
When there are a plurality of Z ^p1 , they may be the same or different from each other, and when there are a plurality of R ^p1 , they may be the same or different from each other, R ^p2 When there are a plurality of them, they may be the same as or different from each other, and when there are a plurality of Sp ^p1 , they may be the same as or different from each other, and a plurality of Sp ^p2 are present. When present, they may be the same or different from each other, and when plural L ^p1 are present, they may be the same or different from each other, and a plurality of M ^p2 are present. In some cases, they may be the same or different from each other.

When the liquid crystal composition further contains a polymerizable compound in addition to the alignment aid (the first compound and the second compound), the pretilt angle of liquid crystal molecules can be appropriately formed.
The liquid crystal composition preferably does not contain a compound having a structure in which oxygen atoms are bonded to each other, such as a peracid (—CO—OO—) structure, in the molecule.

  When importance is placed on the reliability and long-term stability of the liquid crystal composition, the content of the compound having a carbonyl group relative to the total amount of the liquid crystal composition is preferably 5% by mass or less, and 3% by mass or less. It is more preferable that the content be 1 mass% or less, and it is most preferable that the content be substantially absent.

  When importance is attached to stability by UV irradiation, the content of the compound in which the chlorine atom is substituted is preferably 15% by mass or less, and more preferably 10% by mass or less, based on the total amount of the liquid crystal composition. More preferably, it is more preferably 8 mass% or less, further preferably 5 mass% or less, particularly preferably 3 mass% or less, and most preferably substantially not contained.

  It is preferable to increase the content of the compound having all 6-membered ring structures in the molecule, and to increase the content of the compound having all 6-membered ring structures in the molecule with respect to the total amount of the liquid crystal composition, The amount is preferably 80% by mass or more, more preferably 90% by mass or more, further preferably 95% by mass or more, and most preferably substantially 100% by weight.

  In order to suppress the deterioration of the liquid crystal composition due to oxidation, it is preferable to reduce the content of the compound having a cyclohexenylene group as a ring structure, and the amount of the compound having a cyclohexenylene group relative to the total amount of the liquid crystal composition The content is preferably 10% by mass or less, more preferably 8% by mass or less, further preferably 5% by mass or less, particularly preferably 3% by mass or less, and substantially Most preferably, it does not contain.

  When importance is attached to the improvement of viscosity and the improvement of Tni, the content of a compound having a 2-methylbenzene-1,4-diyl group in which a hydrogen atom may be replaced by a halogen in the molecule may be reduced. The content of the compound having a 2-methylbenzene-1,4-diyl group in the molecule is preferably 10% by mass or less, and more preferably 8% by mass or less, based on the total amount of the liquid crystal composition. Is more preferable, 5% by mass or less is more preferable, 3% by mass or less is particularly preferable, and substantially no content is most preferable.

  In the present specification, that the liquid crystal composition does not substantially contain “Compound X” means that the liquid crystal composition does not contain “Compound X” in an amount unintentionally (unavoidably) included. is there.

The preferred lower limit of the average elastic constant (K _AVG ) of the liquid crystal composition is 10 or more, 10.5 or more, 11 or more, 11.5 or more, 12 or more, 12.3 or more. , 12.5 or more, 12.8 or more, 13 or more, 13.3 or more, 13.5 or more, 13.8 or more, 14 or more, 14. 3 or more, 14.5 or more, 14.8 or more, 15 or more, 15.3 or more, 15.5 or more, 15.8 or more, 16 or more, 16.3 or above, 16.5 or above, 16.8 or above, 17 or above, 17.3 or above, 17.5 or above, 17.8 or above, 18 or above is there.

On the other hand, the preferable upper limit of the average elastic constant (K _AVG ) of the liquid crystal composition is 25 or less, 24.5 or less, 24 or less, 23.5 or less, 23 or less, 22. 8 or less, 22.5 or less, 22.3 or less, 22 or less, 21.8 or less, 21.5 or less, 21.3 or less, 21 or less, 20.8 or less, 20.5 or less, 20.3 or less, 20 or less, 19.8 or less, 19.5 or less, 19.3 or less, 19 or less Yes, 18.8 or less, 18.5 or less, 18.3 or less, 18 or less, 17.8 or less, 17.5 or less, 17.3 or less, 17.3 or less, 17 It is the following.

When importance is placed on reduction of power consumption, it is effective to suppress the light amount of the backlight, and it is preferable that the liquid crystal display element has improved light transmittance. For that purpose, the value of K _AVG should be set low. preferable. When the improvement of the response speed is important, it is preferable to set the value of K _AVG higher.

(Liquid crystal display element)
The liquid crystal composition of the present invention is applied to a liquid crystal display device. Hereinafter, an example of the liquid crystal display element according to the present embodiment will be described with reference to FIGS.

  FIG. 1 is a diagram schematically showing the configuration of a liquid crystal display element. In FIG. 1, for convenience of description, the respective constituent elements are shown separated from each other.

  As shown in FIG. 1, the liquid crystal display element 1 according to the present embodiment is provided between the first substrate 2 and the second substrate 3, which are arranged to face each other, and between the first substrate 2 and the second substrate 3. The liquid crystal layer 4 is formed of the liquid crystal composition described above.

  A pixel electrode layer 5 is formed on the surface of the first substrate 2 on the liquid crystal layer 4 side. The common electrode layer 6 is formed on the liquid crystal layer 4 side of the second substrate 3. The first substrate 2 and the second substrate 3 may be sandwiched by a pair of polarizing plates 7 and 8. A color filter 9 may be further provided on the liquid crystal layer 4 side of the second substrate 3.

  That is, the liquid crystal display element 1 according to one embodiment includes a first polarizing plate 7, a first substrate 2, a pixel electrode layer 5, a liquid crystal layer 4 containing a liquid crystal composition, a common electrode layer 6, and a color filter. 9, the second substrate 3, and the second polarizing plate 8 are laminated in this order.

  The first substrate 2 and the second substrate 3 are formed of a flexible material such as glass or plastic. At least one of the first substrate 2 and the second substrate 3 is formed of a transparent material, and the other may be formed of a transparent material or an opaque material such as metal or silicon.

  The first substrate 2 and the second substrate 3 are bonded to each other by a sealing material and a sealing material such as an epoxy thermosetting composition arranged in the peripheral region, and in order to maintain the distance between the substrates between them. For example, granular spacers such as glass particles, plastic particles, and alumina particles, or spacer columns made of a resin formed by a photolithography method may be arranged.

  The first polarizing plate 7 and the second polarizing plate 8 can be adjusted so that the viewing angle and the contrast are improved by adjusting the polarization axes of the respective polarizing plates, and their transmission axes operate in the normally black mode. As such, it is preferable to have the transmission axes perpendicular to each other. In particular, it is preferable that either the first polarizing plate 7 or the second polarizing plate 8 is arranged so as to have a transmission axis parallel to the alignment direction of the liquid crystal molecules when no voltage is applied.

  From the viewpoint of preventing light leakage, the color filter 9 preferably forms a black matrix, and a black matrix (not shown) is preferably formed in a portion corresponding to the thin film transistor.

  The black matrix may be installed together with the color filter on the substrate opposite to the array substrate, or may be installed together with the color filter on the array substrate side. The black matrix is provided on the array substrate and the color filter is provided on the other substrate. It may be installed separately. Further, the black matrix may be installed separately from the color filter, but may be one that reduces the transmittance by superimposing each color of the color filter.

  FIG. 2 is an enlarged plan view of a region surrounded by I line which is a part of the pixel electrode layer 5 formed on the first substrate 2 in FIG.

  As shown in FIG. 2, in the pixel electrode layer 5 including the thin film transistor formed on the surface of the first substrate 2, a plurality of gate bus lines 11 for supplying a scanning signal and a plurality of gate bus lines 11 for supplying a display signal are provided. The data bus lines 12 are arranged in a matrix so as to intersect each other. Note that FIG. 2 shows only the pair of gate bus lines 11, 11 and the pair of data bus lines 12, 12.

  A region surrounded by the plurality of gate bus lines 11 and the plurality of data bus lines 12 forms a unit pixel of the liquid crystal display element, and a pixel electrode 13 is formed in the unit pixel. The pixel electrode 13 has a so-called fishbone structure including two trunk portions that are orthogonal to each other and have a cross shape, and a plurality of branch portions that extend from each trunk portion.

  In addition, a Cs electrode 14 is provided between the pair of gate bus lines 11, 11 substantially in parallel with the gate bus line 11. Further, a thin film transistor including a source electrode 15 and a drain electrode 16 is provided in the vicinity of an intersection where the gate bus line 11 and the data bus line 12 intersect each other. A contact hole 17 is provided in the drain electrode 16.

  Each of the gate bus line 11 and the data bus line 12 is preferably formed of a metal film, and more preferably formed of Al, Cu, Au, Ag, Cr, Ta, Ti, Mo, W, Ni or an alloy thereof. And more preferably Mo, Al or an alloy thereof.

The pixel electrode 13 is preferably a transparent electrode in order to improve the transmittance. The transparent electrode is formed by sputtering an oxide semiconductor (ZnO, InGaZnO, SiGe, GaAs, IZO (Indium Zinc Oxide), ITO (Indium Tin Oxide), SnO, TiO, AZTO (AlZnSnO), etc.).
At this time, the film thickness of the transparent electrode may be 10 to 200 nm. Further, in order to reduce the electric resistance, a transparent electrode can be formed as a polycrystalline ITO film by baking an amorphous ITO film.

  In the liquid crystal display element of the present embodiment, for example, wiring is formed on the first substrate 2 and the second substrate 3 by sputtering a metal material such as Al or an alloy thereof, and the pixel electrode layer 5 and the common electrode layer 6 are formed. Each can be formed. Further, the color filter 9 can be produced by, for example, a pigment dispersion method, a printing method, an electrodeposition method, a dyeing method, or the like.

  The method for producing a color filter by the pigment dispersion method will be described as an example. A curable coloring composition for a color filter is applied on the transparent substrate, subjected to patterning treatment, and cured by heating or light irradiation. By performing this step for each of the three colors of red, green, and blue, a pixel portion for a color filter can be created. Further, the color filter 9 may be installed on the side of the substrate having a TFT or the like.

  The first substrate 2 and the second substrate 3 are opposed to each other so that the pixel electrode layer 5 and the common electrode layer 6 are on the inner side. At that time, the space between the first substrate 2 and the second substrate 3 is interposed via a spacer. May be adjusted. At this time, it is preferable to adjust the thickness of the liquid crystal layer 4 to be, for example, 1 to 100 μm.

  When the polarizing plates 7 and 8 are used, it is preferable to adjust the product of the refractive index anisotropy Δn of the liquid crystal layer 4 and the thickness of the liquid crystal layer 4 so as to maximize the contrast. Further, when there are two polarizing plates 7 and 8, it is possible to adjust the polarization axis of each polarizing plate so that the viewing angle and contrast are good. Furthermore, a retardation film for expanding the viewing angle can also be used. Then, a sealing agent such as an epoxy thermosetting composition is screen-printed on the substrates with a liquid crystal injection port provided, the substrates are attached to each other, and the sealing agent is thermally cured by heating.

  As a method for sandwiching the composition between the two substrates 2 and 3, a usual vacuum injection method or a drop injection (ODF: One Drop Fill) method or the like can be used. Although it does not occur, it has a problem that a trace of injection remains, but in the present embodiment, it can be preferably used for a display element manufactured by using the ODF method.

  In the liquid crystal display element manufacturing process of the ODF method, a sealant such as an epoxy-based heat and heat curable resin is drawn on either one of the backplane and frontplane in a closed-loop bank shape using a dispenser, and the sealant is removed into it. A liquid crystal display device can be manufactured by dropping a predetermined amount of the composition under air and then joining the front plane and the back plane.

  In the present embodiment, it is possible to suppress the generation of drop marks when the liquid crystal composition is dropped on the substrate in the ODF method. Note that a drop mark is defined as a phenomenon in which a drop mark of a liquid crystal composition appears white when black is displayed.

  Further, in the manufacturing process of the liquid crystal display element by the ODF method, it is necessary to drop an optimum liquid crystal injection amount according to the size of the liquid crystal display element. However, the liquid crystal composition of the present embodiment is produced when the liquid crystal is dropped, for example. Since there is little influence on a sudden pressure change or impact in the dropping device and the liquid crystal can be stably dropped for a long time, the yield of the liquid crystal display element can be kept high.

  In particular, the small liquid crystal display element that is widely used in smartphones that has recently become popular is difficult to control the deviation from the optimum value within a certain range because the optimum liquid crystal injection amount is small. By using the composition, a stable discharge amount of the liquid crystal material can be realized even in a small liquid crystal display device.

  When the first compound and the second compound each contain a polymerizable group and the liquid crystal composition contains a polymerizable compound, a method of polymerizing these compounds is to obtain good alignment performance of liquid crystal molecules. Since a moderate polymerization rate is desirable, a method of polymerizing by irradiating with active energy rays such as ultraviolet rays or electron rays singly or in combination or sequentially is preferable. When ultraviolet rays are used, a polarized light source or a non-polarized light source may be used.

  Further, when the liquid crystal composition is sandwiched between two substrates to carry out polymerization in a state, at least the substrate on the irradiation surface side must be provided with appropriate transparency with respect to active energy rays. Moreover, after polymerizing only a specific part using a mask at the time of light irradiation, the orientation state of the unpolymerized part is changed by changing conditions such as electric field, magnetic field or temperature, and further irradiation with active energy rays is performed. It is also possible to use a means of polymerizing.

  In particular, when exposing to ultraviolet light, it is preferable to apply ultraviolet light while applying an alternating electric field to the liquid crystal composition. The applied AC electric field is preferably an AC having a frequency of 10 Hz to 10 kHz, more preferably a frequency of 60 Hz to 10 kHz, and the voltage is selected depending on the desired pretilt angle of the liquid crystal display element. That is, the pretilt angle of the liquid crystal display element can be controlled by the applied voltage. In the horizontal electric field type MVA mode liquid crystal display element, it is preferable to control the pretilt angle to 80 degrees to 89.9 degrees from the viewpoint of alignment stability and contrast.

  The temperature during irradiation is preferably within a temperature range in which the liquid crystal state of the liquid crystal composition is maintained. The liquid crystal composition is preferably polymerized at a temperature close to room temperature, that is, a temperature of typically 15 to 35 ° C.

  A metal halide lamp, a high-pressure mercury lamp, an ultrahigh-pressure mercury lamp, or the like can be used as the lamp that generates ultraviolet rays. Further, as the wavelength of the ultraviolet rays to be irradiated, it is preferable to irradiate the ultraviolet rays in a wavelength range other than the absorption wavelength range of the liquid crystal composition, and it is preferable to use the ultraviolet rays after cutting the ultraviolet rays if necessary.

Intensity of ultraviolet irradiation is ^preferably from ^{0.1mW / cm 2 ~100W / cm 2} , 2mW / cm 2 ~50W / cm 2 is more preferable. Energy of ultraviolet light irradiation, can be appropriately ^adjusted, preferably ^{10mJ / cm 2 ~500J / cm 2} , 100mJ / cm 2 ~200J / cm 2 is more preferable. The intensity may be changed when the ultraviolet rays are irradiated.

  The time of irradiation with ultraviolet rays is appropriately selected depending on the intensity of ultraviolet rays to be irradiated, but is preferably 10 seconds to 3600 seconds, more preferably 10 seconds to 600 seconds.

  In the liquid crystal composition of the present invention, the alignment aids (the first compound and the second compound) do not inhibit the polymerization reaction of the above-mentioned polymerizable compounds, so that the polymerizable compounds are preferably polymerized with each other and the unreacted polymerization is performed. Of the active compound remaining in the liquid crystal composition can be suppressed.

When a compound represented by the above general formula (P) is used as the polymerizable compound, the obtained liquid crystal display element 1 is provided between the two substrates 2 and 3 and the two substrates 2 and 3. And a liquid crystal layer 4 containing a polymer of the first compound, the second compound and the compound represented by the general formula (P). In this case, it is considered that the polymer of the first compound, the second compound and the compound represented by the general formula (P) is unevenly distributed on the substrates 2 and 3 side in the liquid crystal layer 4.
When the polymerizable compound is not used, the liquid crystal layer 4 contains the polymer of the first compound and the second compound.

  The liquid crystal display element 1 may be an active matrix driving liquid crystal display element. The liquid crystal display element 1 may be a PSA type, PSVA type, VA type, IPS type, FFS type or ECB type liquid crystal display element, and is preferably a PSA type liquid crystal display element.

  In the liquid crystal display element of the present embodiment, since the liquid crystal composition containing the alignment aid (first compound and second compound) is used, the liquid crystal layer 4 side of the first substrate 2 and the second substrate 3 It is not necessary to provide an alignment film such as a polyimide alignment film. That is, the liquid crystal display element of the present embodiment can have a configuration in which at least one of the two substrates does not have an alignment film such as a polyimide alignment film.

  Although the alignment aid, the liquid crystal composition and the liquid crystal display device of the present invention have been described above based on the illustrated embodiments, the present invention is not limited to these, and each configuration has an arbitrary function having the same function. The configuration may be replaced with any other configuration, and any other configuration may be added.

  Examples of the present invention will be described below, but the present invention is not limited to the following examples.

  The characteristics measured in the examples are as follows.

T _ni : Nematic phase-isotropic liquid phase transition temperature (° C.)
Δn: refractive index anisotropy at 20 ° C η: viscosity at 20 ° C (mPa · s)
γ ₁ : rotational viscosity at 20 ° C (mPa · s)
Δ∈: Dielectric anisotropy at 20 ° C. K ₃₃ : Elastic constant K _{33 at} 20 ° C. (pN)

1. Preparation of liquid crystal mixture In the following, the following abbreviations are used for the description of compounds.

  <Ring structure>

  <Side chain structure>

  (However, n in the table is a natural number.)

  <Connection structure>

  (However, n in the table is a natural number.)

(Liquid crystal mixture LC-1)
First, a mixture HLC-1 having a formulation shown in Table 3 below was prepared. To 100% by weight of this mixture HLC-1, 0.3% by weight of the following polymerizable compound (R-1-0) was added and dissolved by heating to obtain a liquid crystal mixture LC-1.

(Liquid crystal mixture LC-1 to LC-8)
First, mixtures HLC-2 to HLC-8 having the formulations shown in Table 4 below were prepared. To 100% by weight of each of these mixtures HLC-2 to HLC-8, 0.3% by weight of the above-mentioned polymerizable compound (R-1-0) was added and dissolved by heating to give liquid crystal mixtures LC-2 to LC. -8 was obtained.

(Liquid crystal mixture LC-9 to LC-16)
In each 100% by weight of the mixture HLC-1 to HLC-8, 0.3% by weight of the above polymerizable compound (R-1-0) and 0.5% by weight of the following polymerizable compound (R-1-1). %, And dissolved by heating to obtain liquid crystal mixtures LC-9 to LC-16.

2. Preparation of liquid crystal composition (Example 1)
With respect to 100% by weight of the liquid crystal mixture LC-1, 0.3% by weight of the compound (PJ-I-1) as the first compound and 0.3% by weight of the compound (PJ-II-1) as the second compound. % And were added to prepare a liquid crystal composition.

(Example 2)
The liquid crystal composition was prepared by adding 0.5% by weight of the compound (PJ-I-1) and 0.5% by weight of the compound (PJ-II-1) to 100% by weight of the liquid crystal mixture LC-1. Was prepared.

(Example 3)
The liquid crystal composition was prepared by adding 0.5% by weight of the compound (PJ-I-1) and 1.0% by weight of the compound (PJ-II-1) to 100% by weight of the liquid crystal mixture LC-1. Was prepared.

(Examples 4 to 6)
A liquid crystal composition was prepared in the same manner as in Examples 1 to 3 except that the first compound was changed from the compound (PJ-I-1) to the compound (PJ-I-2).

(Examples 7 to 9)
A liquid crystal composition was prepared in the same manner as in Examples 1 to 3 except that the first compound was changed from the compound (PJ-I-1) to the compound (PJ-I-3).

(Examples 10 to 12)
A liquid crystal composition was prepared in the same manner as in Examples 1 to 3 except that the first compound was changed from the compound (PJ-I-1) to the compound (PJ-I-4).

(Examples 13 to 15)
A liquid crystal composition was prepared in the same manner as in Examples 1 to 3 except that the first compound was changed from the compound (PJ-I-1) to the compound (PJ-I-5).

(Examples 16-18)
A liquid crystal composition was prepared in the same manner as in Examples 7 to 9 except that the compound (PJ-II-1) was changed to the compound (PJ-II-2) as the second compound.

(Examples 19 to 21)
A liquid crystal composition was prepared in the same manner as in Examples 7 to 9 except that the compound (PJ-II-1) was changed to the compound (PJ-II-3) as the second compound.

(Examples 22 to 24)
Liquid crystal compositions were prepared in the same manner as in Examples 7 to 9 except that the compound (PJ-II-1) was changed to the compound (PJ-II-4) as the second compound.

(Examples 25 to 27)
A liquid crystal composition was prepared in the same manner as in Examples 4 to 6 except that the compound (PJ-II-1) was changed to the compound (PJ-II-2) as the second compound.

(Examples 28 to 30)
A liquid crystal composition was prepared in the same manner as in Examples 4 to 6 except that the compound (PJ-II-1) was changed to the compound (PJ-II-3) as the second compound.

(Examples 31 to 33)
A liquid crystal composition was prepared in the same manner as in Examples 4 to 6 except that the compound (PJ-II-1) was changed to the compound (PJ-II-4) as the second compound.

(Examples 34 to 43)
A liquid crystal composition was prepared in the same manner as in Example 23 except that the liquid crystal composition LC-1 was changed to the liquid crystal compositions LC-2 to LC-8.

(Comparative Example 1)
A liquid crystal composition was prepared in the same manner as in Example 1 except that the compound (PJ-I-1) and the compound (PJ-II-1) were not used.

(Comparative Examples 2 to 4)
A liquid crystal composition was prepared in the same manner as in Example 1 except that the following compounds Ref-1 to Ref-3 were added in an amount of 1.0% by weight based on 100% by weight of the liquid crystal mixture LC-1.

(Comparative Examples 5 to 13)
The above compounds (PJ-I-1) to (PJ-I-5) and compounds (PJ-II-1) to (PJ-II-4) were each added to 1% of 100% by weight of the liquid crystal mixture LC-1. A liquid crystal composition was prepared in the same manner as in Example 1 except that 0.0% by weight was added.

(Comparative Examples 14 to 20)
A liquid crystal composition was prepared in the same manner as in Example 1 except that the compound (PJ-I-3) was added in an amount of 1.0% by weight based on 100% by weight of each of the liquid crystal mixtures LC-1 to LC-8. Was prepared.

3. Evaluation The following evaluation tests were performed on each liquid crystal composition of Examples and Comparative Examples.

3-1. Evaluation Test of Low Temperature Stability The liquid crystal composition was filtered through a membrane filter (PTFE 13 mm-0.2 μm, manufactured by Agilent Technologies), and dissolved air was removed by allowing it to stand for 15 minutes under vacuum reduced pressure conditions. 0.5 g of this was weighed in a vial bottle that was washed with acetone and dried sufficiently, and allowed to stand in a low temperature environment of -25 ° C for 14 days. After that, the presence or absence of precipitation was visually observed and judged according to the following four stages.

  A: No precipitation was confirmed even after standing for 14 days.

  B: Precipitation was confirmed after standing for 7 days.

  C: Precipitation was confirmed after standing for 3 days.

  D: Precipitation was confirmed after standing for 1 day.

3-2. Vertical orientation evaluation test 1
First, it has a first substrate (common electrode substrate) having a transparent common electrode layer but no alignment film, and a pixel electrode layer including a transparent pixel electrode driven by an active element, but no alignment film. A second substrate (pixel electrode substrate) was prepared. Next, a sealing material was arranged along the outer peripheral edge of the first substrate, and the liquid crystal composition was dropped on the first substrate and inside the sealing material.

  Then, the second substrate was arranged so as to face the first substrate with a sealant interposed therebetween, and the liquid crystal composition was sandwiched between the first substrate and the second substrate. In this state, the seal material was cured under normal pressure at 110 ° C. for 2 hours. As a result, a liquid crystal cell having a cell gap of 3.2 μm was obtained.

  At this time, the vertical alignment property and alignment unevenness such as a drop mark were observed using a polarization microscope, and evaluated in the following four stages.

A: Vertical alignment uniformly over the entire surface including the edges, etc. B: Level with a slight amount of alignment defects that is acceptable C: Level with many alignment defects, including edges, that is unacceptable D: Poor alignment failure

3-3. Vertical orientation evaluation test 2
First, a first substrate (filter substrate) having a color filter layer but no alignment film and a pixel electrode layer including a transparent pixel electrode driven by an active element, but having no alignment film. A second substrate (pixel electrode substrate) was prepared. Next, a sealing material was arranged along the outer peripheral edge of the first substrate, and the liquid crystal composition was dropped on the first substrate and inside the sealing material.

  Then, the second substrate was arranged so as to face the first substrate with a sealant interposed therebetween, and the liquid crystal composition was sandwiched between the first substrate and the second substrate. In this state, the seal material was cured under normal pressure at 110 ° C. for 2 hours. As a result, a liquid crystal cell having a cell gap of 3.2 μm was obtained.

  At this time, the vertical alignment property and alignment unevenness such as a drop mark were observed using a polarization microscope, and evaluated in the following four stages.

A: Vertical alignment uniformly over the entire surface including the edges, etc. B: Level with a slight amount of alignment defects that is acceptable C: Level with many alignment defects, including edges, that is unacceptable D: Poor alignment failure

3-4. Evaluation test 3 of vertical orientation
First, the first substrate (electrode filter substrate), which has both the patterned transparent common electrode layer portion and the color filter layer portion and has no alignment film, and the transparent pixel electrode portion driven by the active element. A second substrate (pixel electrode substrate) having a pixel electrode layer and a color filter layer portion partially, but not having an alignment film was prepared. Next, a sealing material was arranged along the outer peripheral edge of the first substrate, and the liquid crystal composition was dropped on the first substrate and inside the sealing material.

  Then, the second substrate was arranged so as to face the first substrate with a sealant interposed therebetween, and the liquid crystal composition was sandwiched between the first substrate and the second substrate. In this state, the sealing material was cured under normal pressure at 110 ° C. for 2 hours to obtain a liquid crystal cell having a cell gap of 3.5 μm.

  At this time, the vertical alignment property and alignment unevenness such as a drop mark were observed using a polarization microscope, and evaluated in the following four stages.

A: Vertical alignment uniformly over the entire surface including the boundary and edges of the patterned substrate B: Level where a slight amount of alignment defects is acceptable C: Level where many alignment defects are not acceptable including edges D: Poor orientation

3-5. Evaluation test of pretilt angle formation While applying a rectangular alternating current wave of 10 V and 100 Hz to the liquid crystal cell used in the above “3-2. Vertical alignment property evaluation test 1”, the illuminance at 365 nm was measured using a high pressure mercury lamp. UV light of 100 m / cm ² was irradiated for 200 seconds. Thereafter, the stability of white display was evaluated by applying the physical external force to the cell while applying a rectangular alternating current wave of 10 V and 100 Hz and observing in the crossed Nicols state, and evaluated in the following four stages.

A: Vertical alignment uniformly over the entire surface including the edges, etc. B: Level with a slight amount of alignment defects that is acceptable C: Level with many alignment defects, including edges, that is unacceptable D: Poor alignment failure

3-6. Evaluation test of residual monomer amount The cell used in the above “3-5. Pretilt angle formation evaluation test” was further irradiated with a UV fluorescent lamp manufactured by Toshiba Lighting & Technology Co., Ltd. for 60 minutes (illuminance at 313 nm was 1.7 mW / cm. The residual amount of the polymerizable compound (R1-1-0) after ² ) was quantified by HPLC to determine the residual monomer amount. The following four grades were evaluated according to the residual amount of the monomer.

A: less than 300 ppm B: 300 ppm or more and less than 500 ppm.

C: 500 ppm or more and less than 1500 ppm D: 1500 ppm or more

3-7. Evaluation Test of Response Characteristics The cell having a cell gap of 3.2 μm used in the above “3-5. Evaluation test of pretilt angle formation” was further irradiated with a UV fluorescent lamp manufactured by Toshiba Lighting & Technology Co., Ltd. for 60 minutes (illuminance at 313 nm. 1.7 mW / cm ² ). The response speed of the cell thus obtained was measured. The response speed was measured by measuring Voff at 6 V under a temperature condition of 25 ° C. using DMS703 manufactured by AUTORONIC-MELCHERS. The response characteristics were evaluated according to the following 4 grades.

A: Less than 5 ms B: 5 ms or more and less than 15 ms C: 15 ms or more and less than 25 ms D: 25 ms or more

  As described above, it was found that the alignment aid and the liquid crystal composition of the present invention have excellent alignment regulating force of liquid crystal molecules and high storage stability. It was also found that the liquid crystal display device of the present invention has excellent response characteristics.

  Further, in the same manner as in Examples 1 to 40 and Comparative Examples 1 to 20, various alignment aids were added to the liquid crystal mixtures LC-9 to LC-16 and dissolved by heating to obtain liquid crystal compositions. The vertical alignment of these liquid crystal compositions was evaluated in the same manner as above, and it was confirmed that the Examples had better alignment than the Comparative Examples.

1 Liquid Crystal Display Element 2 First Substrate 3 Second Substrate 4 Liquid Crystal Layer 5 Pixel Electrode Layer 6 Common Electrode Layer 7, 8 Polarizing Plate 9 Color Filter 11 Gate Bus Line 12 Data Bus Line 13 Pixel Electrode 14 Cz Electrode 15 Source Electrode 16 Drain Electrode 17 Contact hole

Claims (20)

An alignment aid that is disposed between two substrates together with liquid crystal molecules and that spontaneously aligns the liquid crystal molecules,
A first compound comprising at least one first affinity group having an affinity for said substrate;
A second compound having at least one second affinity group having an affinity for the substrate and having a lower polarity than the first affinity group,
The first affinity group is a group represented by the following general formulas (K1-1) to (K1-3):

(In the formula,
The black dot at the left end represents the bond,
W ^K2 represents a methine group, C—CH ₃ , C—C ₂ H ₅ , a nitrogen atom or a silicon atom,
W ^K3 represents a carbon atom,
X _{1 to} X ₅ each independently represent a hydrogen atom, an —OH group or CH ₂ ═C (CH ₃ ) COO—,
At least one of X ₁ and X ₂ represents an —OH group,
At least one of X ₃ , X ₄ and X ₅ represents an —OH group,
Sp ₁ , Sp ₂ and Sp ₃ each represent a single bond or a spacer group. )
Selected from
The second affinity group is a group represented by the following general formulas (K2-1 ), (K2-3), (K2-8) and (K2-9) :

(In the formula,
The black dot at the left end represents the bond,
The arbitrary methylene groups are each independently a linear or branched alkyl group having 1 to 5 carbon atoms, a linear or branched alkyloxy group having 1 to 5 carbon atoms, or an alkyl group having 1 to 5 carbon atoms. It may be substituted with a linear or branched perfluoroalkyl group,
W ^K1 represents a methine group, C—CH ₃ , C—C ₂ H ₅ or a nitrogen atom,
X ^K1 and Y ^K1 each independently represent —CH ₂ —, an oxygen atom or a sulfur atom,
Z ^K1 represents an oxygen atom or a sulfur atom. )
Alignment aid selected from The aligning agent according to claim 1, wherein the second compound contains a second affinity group represented by the general formula (K2-1). Orientation aid according to claim 1 or 2 including the first compound and the second compound, each of the at least one polymerizable group. The alignment aid according to claim 3 , wherein the polymerizable group is selected from the group represented by the following general formulas (P-1) to (P-13).

(In the formula, the black dot at the right end represents a bond.) It said first affinity group comprises a hydroxyl group, the second affinity group, the orientation aid according to any one of claims 1-4 ether group or containing a carbonate group. The first compound and the second compound each include a mesogenic group,
Said first affinity group, the second affinity group and the polymerizable group, according to any one of claims 1 to 5 attached to the mesogenic group directly or via a spacer group, respectively Alignment aid. 7. The orientation according to claim 6 , wherein the first compound and the second compound each include an end group bonded to the mesogenic group on the opposite side of the first affinity group or the second affinity group. Auxiliary agent. The terminal group is a linear or branched alkyl group having 1 to 40 carbon atoms, a linear or branched halogenated alkyl group having 1 to 40 carbon atoms (provided that the alkyl group or -CH in the halogenated alkyl group is _2- may be substituted by -CH = CH-, -C≡C-, -O-, -NH-, -COO- or -OCO-, but -O- is not continuous) or The alignment aid according to claim 7 , which is represented by a polymerizable group bonded to the mesogen group directly or through a spacer group. The spacer group includes —CH═CH—, —CF═CF—, —C≡C—, —COO—, —OCO—, —OCOO—, —OOCO—, —CF ₂ O—, —OCF ₂ —, _{-CH = CHCOO -, - OCOCH =} CH -, - CH 2 -CH 2 COO -, - OCOCH 2 -CH 2 -, - CH = C (CH 3) COO -, - OCOC (CH 3) = CH-, _{-CH 2 -CH (CH 3) COO} -, - OCOCH (CH 3) -CH 2 -, - OCH 2 CH 2 O- or branched or straight-chain alkylene group having 1 to 20 carbon atoms (provided that the alkylene group one or not adjacent two or more -CH ₂ in the - is -O -, -. the COO- or -OCO- in may be substituted) described in any one of claims 6-8 is Alignment aid. The mesogen group has the following general formula (i):

(In the formula,
The leftmost black dot and the rightmost black dot represent a bond,
A ⁱ¹ represents a divalent 6-membered ring aromatic group, a divalent 6-membered ring heteroaromatic group, a divalent 6-membered ring aliphatic group or a divalent 6-membered ring heteroaliphatic group,
The hydrogen atom in these ring structures is a halogen atom, a linear or branched alkyl group having 1 to 10 carbon atoms, a linear or branched halogenated alkyl group having 1 to 10 carbon atoms, or 1 to 10 carbon atoms. 10 linear or branched alkoxy or ^P i1 ^{-Sp i1} - may be substituted with, ^{where, P i1} is a group represented by the general formula (P-1) ~ (P -13) Represents a polymerizable group selected from the following, Sp ⁱ¹ represents the same meaning as Z ⁱ¹ ,
Z ⁱ¹ is a single bond, —CH═CH—, —CF═CF—, —C≡C—, —COO—, —OCO—, —OCOO—, —OOCO—, —CF ₂ O—, —OCF _{2 -, - CH = CHCOO -,} - OCOCH = CH -, - CH 2 -CH 2 COO -, - OCOCH 2 -CH 2 -, - CH = C (CH 3) COO -, - OCOC (CH 3) = CH _{-, - CH 2 -CH (CH} 3) COO -, - OCOCH (CH 3) -CH 2 -, - OCH 2 CH 2 O- or C2-20 alkylene group (provided that 1 in the alkylene radical Or two or more non-adjacent —CH ₂ — may be substituted with —O—, —COO— or —OCO—),
m ⁱ¹ represents an integer of 1 to 5,
When m ⁱ¹ is 2 or more, the plurality of A ⁱ¹ may be the same or different from each other. )
The alignment aid according to any one of claims 6 to 9 , represented by: And an alignment aid according to any one of claims 1-10, containing a liquid crystal molecule, liquid crystal composition characterized in that the dielectric anisotropy ([Delta] [epsilon]) is negative. The liquid crystal molecules are represented by the following general formulas (N-1) to (N-3):

(In the formula,
R ^N11 , R ^N12 , R ^N21 , R ^N22 , R ^N31 and R ^N32 are each independently an alkyl group having 1 to 8 carbon atoms (provided that one or two or more of the alkyl groups are not adjacent to each other). of -CH ₂ - are each independently, -CH = CH -, - C≡C -, - O -, - CO -, -. the COO- or may be substituted by -OCO-) represents ,
A ^N11 , A ^N12 , A ^N21 , A ^N22 , A ^N31 and A ^N32 are each independently,
(A) 1,4-cyclohexylene group (however, one —CH ₂ — present in this group or two or more —CH ₂ — not adjacent to each other may be substituted with —O—. ),
(B) 1,4-phenylene group (however, one -CH = present in this group or two or more -CH = which are not adjacent to each other may be replaced by -N =),
(C) Naphthalene-2,6-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or decahydronaphthalene-2,6-diyl group (however, naphthalene-2,6-diyl group One -CH = present in a group or a 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or two or more non-adjacent -CH = may be substituted with -N = And (d) represents a group selected from the group consisting of 1,4-cyclohexenylene groups,
The group (a), group (b), group (c) and group (d) may each independently be 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- the Represents
X ^N21 represents a hydrogen atom or a fluorine atom,
T ^N31 is, -CH ₂ - represents an 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 respectively Independently 1, 2 or 3;
When a plurality of A ^{N11 to} A ^N32 and a plurality of Z ^{N11 to} Z ^N32 are present, they may be the same or different from each other. )
The liquid crystal composition according to claim 11 , comprising a compound selected from the group consisting of: The liquid crystal composition according to claim 11 , wherein the liquid crystal molecule contains a compound represented by the following general formula (L).

(In the formula,
R ^L1 and R ^L2 are each independently an alkyl group having 1 to 8 carbon atoms (provided that one or two or more —CH ₂ — which are not adjacent to each other in the alkyl group are independently — CH = CH-, -C [identical to] C-, -O-, -CO-, -COO- or -OCO-).
n ^L1 represents 0, 1, 2 or 3,
A ^L1 , A ^L2 and A ^L3 are each independently
(A) 1,4-cyclohexylene group (however, one —CH ₂ — present in this group or two or more —CH ₂ — not adjacent to each other may be substituted with —O—. ),
(B) 1,4-phenylene group (however, one -CH = present in this group or two or more -CH = which are not adjacent to each other may be substituted with -N =), and (C) Naphthalene-2,6-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or decahydronaphthalene-2,6-diyl group (however, naphthalene-2,6-diyl group One -CH = present in a group or a 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or two or more non-adjacent -CH = may be substituted with -N = Good.)
Represents a group selected from the group consisting of
The group (a), the group (b) and the group (c) may each independently be 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 = N-N = CH -, - CH = CH -, - represents CF = CF- or -C≡C-,
When n ^L1 is 2 or 3 and a plurality of A ^L2 are present, they may be the same or different from each other, and when n ^L1 is 2 or 3 and a plurality of Z ^L2 are present, They may be the same or different from each other, except for the compounds represented by the general formulas (N-1), (N-2) and (N-3). ) The liquid crystal composition according to claim 11 , further comprising a polymerizable compound. The liquid crystal composition according to claim 14 , wherein the polymerizable compound contains at least one compound represented by the following general formula (P).

(In the formula,
Z ^p1 represents a fluorine atom, a cyano group, a hydrogen atom, an alkyl group having 1 to 15 carbon atoms in which a hydrogen atom may be replaced by a halogen atom, and a number of carbon atoms in which a hydrogen atom may be replaced by a halogen atom. An alkoxy group having 1 to 15 carbon atoms, an alkenyl group having 1 to 15 carbon atoms in which a hydrogen atom may be replaced by a halogen atom, an alkenyloxy having 1 to 15 carbon atoms in which a hydrogen atom may be replaced by a halogen atom. A group or -Sp ^p2- R ^p2 ,
R ^p1 and R ^p2 are each represented by the following formula (R-I) to formula (R-IX):

(In the formula,
Binds to Sp ^p1 or Sp ^p2 at *,
R ^{2 to} R ⁶ each independently represent a hydrogen atom, an alkyl group having 1 to 5 carbon atoms or a halogenated alkyl group having 1 to 5 carbon atoms,
W represents a single bond, -O- or a methylene group,
T represents a single bond or -COO-,
p, t, and q each independently represent 0, 1, or 2. )
Represents either
Sp ^p1 and Sp ^p2 each represent a spacer group,
L ^p1 and L ^p2 are each independently a single bond, —O—, —S—, —CH ₂ —, —OCH ₂ —, —CH ₂ O—, —CO—, —C ₂ H ₄ —, _{-COO -, - OCO -, -} OCOOCH 2 -, - CH 2 OCOO -, - OCH 2 CH 2 O -, - CO-NR a -, - NR a -CO -, - SCH 2 -, - CH 2 S ^{-, - CH = CR a -COO} -, - CH = CR a -OCO -, - COO-CR a = CH -, - OCO-CR a = CH -, - COO-CR a = CH-COO -, - ^{COO-CR a = CH-OCO} -, - OCO-CR a = CH-COO -, - OCO-CR a = CH-OCO -, - (CH 2) z -C (= O) -O -, - ( _{CH 2) z -O- (C =} O) -, - O- (C = O) - (CH 2) z -, - (C = O _{-O- (CH 2) z -,} - CH 2 (CH 3) C-C (= O) -O -, - CH 2 (CH 3) C-O- (C = O) -, - O- ( _{C = O) -C (CH 3} ) CH 2, - (C = O) -O-C (CH 3) -CH 2, -CH = CH -, - CF = CF -, - CF = CH -, - _{CH = CF -, - CF 2} -, - CF 2 O -, - OCF 2 -, - CF 2 CH 2 -, - CH 2 CF 2 -, - CF 2 CF 2 - or -C≡C- (provided that In the formula, each R ^a independently represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and z represents an integer of 1 to 4),
M ^p2 is 1,4-phenylene group, 1,4-cyclohexylene group, anthracene-2,6-diyl group, phenanthrene-2,7-diyl group, pyridine-2,5-diyl group, pyrimidine-2, 5-diyl group, naphthalene-2,6-diyl group, indane-2,5-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, 1,3-dioxane-2,5 Represents a diyl group or a single bond, M ^p2 is unsubstituted or is an alkyl group having 1 to 12 carbon atoms, a halogenated alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms. ^May be substituted with a halogenated alkoxy group having 1 to 12 carbon atoms, a halogen atom, a cyano group, a nitro group or -R ^p1 .
M ^p1 is represented by the following formulas (i-11) to (ix-11):

(In the formula, * binds to Sp ^p1 and ** binds to L ^p1 , L ^p2, or Z ^p1 .)
Represents either
M ^p3 is represented by the following formulas (i-13) to (ix-13):

(In the formula, * binds to Z ^p1 and ** binds to L ^p2 .)
Represents either
m ^{p2 to} m ^p4 each independently represent 0, 1, 2 or 3.
m ^p1 and m ^p5 each independently represent 1, 2 or 3,
When there are a plurality of Z ^p1 , they may be the same or different from each other, and when there are a plurality of R ^p1 , they may be the same or different from each other, R ^p2 When there are a plurality of them, they may be the same as or different from each other, and when there are a plurality of Sp ^p1 , they may be the same as or different from each other, and a plurality of Sp ^p2 are present. When present, they may be the same or different from each other, and when plural L ^p1 are present, they may be the same or different from each other, and a plurality of M ^p2 are present. In some cases, they may be the same or different from each other. ) A liquid crystal display device comprising two substrates and a liquid crystal layer provided between the two substrates and containing the liquid crystal composition according to any one of claims 11 to 15 . The liquid crystal display device according to claim 16 , wherein the liquid crystal layer contains a polymer of the first compound and the second compound. The liquid crystal display device according to claim 16 , which is for driving an active matrix. The liquid crystal display device according to claim 16 , which is a PSA type, a PSVA type, a VA type, an IPS type, an FFS type, or an ECB type. The liquid crystal display element according to claim 16 , wherein at least one of the two substrates does not have an alignment film.

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