TW202028436A - Liquid crystal composition and liquid crystal display element - Google Patents

Abstract

Provided are: a liquid crystal composition in which a large amount of polymerizable monomer is dissolved, the liquid crystal composition capable of forming a pre-tilt angle in a shorter time by sufficiently increasing the rate of polymerization thereof; and a liquid crystal display which uses a related liquid crystal composition, has a sufficient pre-tilt angle, has little or no change in pre-tilt angle, and is excellent in terms of voltage holding ratio (VHR) and response performance. A liquid crystal composition according to the present invention is characterized by containing: a liquid crystal molecule; a polymerizable monomer A which has a mesogenic skeleton and at least two polymerizable groups bonded to the mesogenic skeleton, wherein all of the polymerizable groups are directly bonded to the mesogenic skeleton; and a polymerizable monomer B which has a mesogenic skeleton and at least two polymerizable groups bonded to the mesogenic skeleton, wherein all of the polymerizable groups are bonded to the mesogenic skeleton via spacer groups.

Description

Liquid crystal composition and liquid crystal display element

The present invention relates to a liquid crystal composition and a liquid crystal display element.

In order to improve the characteristics of liquid crystal display elements, polymerizable monomers such as PSA (Polymer Sustained Alignment) are mixed into the liquid crystal composition constituting the liquid crystal layer to control the alignment state of the liquid crystal molecules (for example, refer to Patent Documents 1 to 5). ).

When the polymerizable monomer does not have a spacer in the molecule, the polymer obtained by the polymerization of the polymerizable monomer becomes rigid. Therefore, the generation of IS (Image Sticking) in the liquid crystal display element can be reduced. However, the polymerizable monomer may have low solubility in the liquid crystal composition. [Prior Technical Literature] [Patent Literature]

Patent Document 1: Specification of U.S. Patent Application Publication No. 2010/0124623 Patent Document 2: Japanese Patent No. 6087815 Patent Document 3: International Publication No. 2017/008884 Patent Document 4: Japanese Special Publication No. 2015-513577 Patent Document 5: Specification of US Patent No. 9139775

[The problem to be solved by the invention]

The object of the present invention is to provide a liquid crystal composition, which can form a pretilt angle in a shorter time by dissolving a large amount of polymerizable monomers to sufficiently increase the polymerization rate; and to provide a liquid crystal display element using the The liquid crystal composition has a sufficient pretilt angle, does not produce a change in the pretilt angle or rarely changes the pretilt angle, and is excellent in voltage retention (VHR) or response performance. [Technical means to solve the problem]

This object is achieved by the present invention of the following (1) to (13).

(1) A liquid crystal composition containing: Liquid crystal molecules Polymerizable monomer A, which has a mesogen skeleton and at least two polymerizable groups bonded to the mesogen skeleton, and all of the polymerizable groups are directly bonded to the mesogen skeleton; and The polymerizable monomer B has a mesogen skeleton and at least two polymerizable groups bonded to the mesogen skeleton, and all the polymerizable groups are bonded to the mesogen skeleton via spacers.

(2) The liquid crystal composition as described in (1) above, wherein, in the polymerizable monomer A, the two polymerizable groups are bonded to almost symmetrical ones of both ends of the mesogen skeleton in the longitudinal direction. position.

(3) The liquid crystal composition as described in (1) or (2) above, wherein in the polymerizable monomer A, the mesogen skeleton has 2 to 4 ring structures.

(4) The liquid crystal composition according to the above (3), wherein in the polymerizable monomer A, the ^mesogen skeleton further includes the following substituent K ^i1A bonded to the ring structure.

Substituent K ^i1A represents a halogen atom, a linear or branched alkyl group with 1-40 carbon atoms, a linear or branched halogenated alkyl group with 1-40 carbon atoms, a linear or A branched cyanide alkyl group having 1 to 40 carbon atoms, or a linear or branched alkoxy group having 1 to 40 carbon atoms. (Two or more secondary carbon atoms in the above-mentioned alkyl group can be substituted by -C(=X ⁱ¹ )- and/or -(CH-CN)-, and the secondary carbon atoms in the above-mentioned alkyl group can be replaced by oxygen atoms. Adjacent methods are -C (=CH ₂ ) -, -C (=CHR ⁱ³ ) -, -C (=CR ⁱ³ ₂ ) -, -CH=CH-, -C≡C-, -O-,- NH-, -COO- or -OCO- substituted, the end of the above-mentioned alkyl group may be substituted by OH, NH ₂ or CN. In the formula, X ⁱ¹ represents oxygen atom, sulfur atom, NH or NR ⁱ³ , and R ⁱ³ represents linear Or a branched alkyl group with 1 to 20 carbon atoms (wherein, the secondary carbon atoms in the alkyl group can be -O-, -CH=CH- or -C≡C so that oxygen atoms are not directly adjacent -replace))

(5) The liquid crystal composition according to any one of (1) to (4) above, wherein in the polymerizable monomer B, the mesogen skeleton contains 2 to 4 ring structures.

(6) The liquid crystal composition according to (5) above, wherein in the polymerizable monomer B, the 2 to 4 ring structures in the mesogen skeleton form a bonded polycyclic structure.

(7) The liquid crystal composition as described in (6) above, wherein in the polymerizable monomer B, the ^mesogen skeleton further includes the following substituent K ^i1B bonded to the ring structure.

Substituent K ^i1B represents a halogen atom, a linear or branched alkyl group with 1 to 40 carbon atoms, a linear or branched haloalkyl group with 1 to 40 carbon atoms, a linear or A branched cyanide alkyl group having 1 to 40 carbon atoms, or a linear or branched alkoxy group having 1 to 40 carbon atoms. (Two or more secondary carbon atoms in the above-mentioned alkyl group can be substituted by -C(=X ⁱ¹ )- and/or -(CH-CN)-, and the secondary carbon atoms in the above-mentioned alkyl group can be replaced by oxygen atoms. Adjacent methods are -C (=CH ₂ ) -, -C (=CHR ⁱ³ ) -, -C (=CR ⁱ³ ₂ ) -, -CH=CH-, -C≡C-, -O-,- NH-, -COO- or -OCO- substitution, the hydrogen atom in the above-mentioned alkyl group may be substituted by P-Sp-, and the end of the above-mentioned alkyl group may be substituted by OH, NH ₂ or CN. In the formula, X ⁱ¹ represents an oxygen atom , Sulfur atom, NH or NR ⁱ³ , R ⁱ³ represents a linear or branched alkyl group with 1 to 20 carbon atoms (wherein the secondary carbon atoms in the alkyl group can be such that oxygen atoms are not directly adjacent Substituted by -O-, -CH=CH- or -C≡C-), P represents a polymerizable group, Sp represents a spacer group)

(8) The liquid crystal composition according to any one of (1) to (7) above, wherein the amount of the polymerizable monomer A is relative to the total of the polymerizable monomer A and the polymerizable monomer B The amount is 25 to 75% by mass.

(9) The liquid crystal composition according to any one of (1) to (8) above, wherein the total amount of the polymerizable monomer A and the polymerizable monomer B contained in the liquid crystal composition is relative to It is 0.1-3 parts by mass based on 100 parts by mass of the liquid crystal molecules.

(10) A liquid crystal display element comprising two substrates and a liquid crystal layer provided between the two substrates, the liquid crystal layer containing the liquid crystal composition described in any one of (1) to (9) above.

(11) The liquid crystal display element according to the above (10), wherein the liquid crystal layer contains a polymer of the polymerizable monomer A and the polymerizable monomer B.

(12) The liquid crystal display element described in (10) or (11) above, which is used for active matrix driving.

(13) The liquid crystal display element described in any one of (10) to (12) above, which is a PSA type, PSVA type, VA type, IPS type, FFS type, or ECB type. [Effects of Invention]

According to the present invention, by using a polymerizable monomer having a spacer and a polymerizable monomer not having a spacer together, a liquid crystal composition can be obtained in which a large amount of polymerizable monomer is dissolved and the polymerization rate is sufficiently increased Therefore, a liquid crystal composition with a pretilt angle can be formed in a shorter time. In addition, by using the liquid crystal composition, a liquid crystal display device having a sufficient pretilt angle, no change in the pretilt angle or very little change in the pretilt angle, and excellent voltage retention (VHR) or response performance can be obtained.

Hereinafter, the liquid crystal composition and the liquid crystal display element of the present invention will be described in detail based on preferred embodiments.

(Liquid crystal composition) It contains a liquid crystal molecule, a polymerizable monomer A directly bonded to all polymerizable groups and the mesogen skeleton, and a polymerizable monomer B where all polymerizable groups are bonded to the mesogen skeleton via spacers.

The polymerizable monomer A in which the polymerizable group is directly bonded to the mesogen skeleton without the spacer group is rigid, and therefore generally has low solubility in the liquid crystal composition.

In contrast, the polymerizable monomer B, in which the polymerizable group is bonded to the mesogen skeleton via the spacer, is flexible due to the presence of the spacer, and has high solubility in the liquid crystal composition.

In the present invention, by using the polymerizable monomer A and the polymerizable monomer B together, the content of the polymerizable monomer A in the liquid crystal composition can be increased. Therefore, a liquid crystal composition in which a polymerizable monomer containing a large amount of polymerizable monomer A is dissolved can be obtained. This liquid crystal composition can complete the polymerization reaction in a shorter time, and therefore can optimize energy consumption.

In addition, the liquid crystal composition of the present invention does not lower the refractive index anisotropy (Δn) and the nematic-isotropic liquid phase transition temperature (Tni), and exhibits low viscosity (η) and small rotational viscosity (γ1). ), and a large bending elastic constant (K33).

In view of this, the liquid crystal display element (liquid crystal layer) using the liquid crystal composition of the present invention can impart a sufficient pretilt angle to the liquid crystal molecules and can also reduce the residual amount of polymerizable monomers. As a result, the liquid crystal display element exhibits high voltage retention (VHR) and high-speed responsiveness, and exhibits excellent display quality such as prevention or suppression of poor alignment or generation of IS (after-image).

((Polymerizable monomer A)) The polymerizable monomer A has a mesogen skeleton and at least two polymerizable groups bonded to the mesogen skeleton. Then, all the polymerizable groups are directly bonded to the mesogen skeleton.

The mesogen skeleton preferably has 2 to 4 ring structures, and more preferably has 2 to 3 ring structures. By having the mesogen skeleton having this number of ring structures, the function of the polymerizable monomer A to impart a pretilt angle to liquid crystal molecules can be further improved.

As a specific example of the mesogen skeleton, the following formula (B ⁱ¹¹ ), formula (B ⁱ¹² ), or formula (B ⁱ⁴¹ ) can be ^cited , for example.

One or more hydrogen atoms in the ring structure may be substituted by a halogen atom, an alkoxy group having 1 to 8 carbon atoms, or an alkyl group having 1 to 8 carbon atoms.

The polymerizable monomer A has at least two polymerizable groups. By polymerizing the polymerizable groups of polymerizable monomer A and polymerizable monomer B with each other, the polymer of polymerizable monomer A and polymerizable monomer B can be more firmly fixed to the substrate, and the liquid crystal molecules can be increased The retention. As a result, peeling of the liquid crystal layer from the substrate can be prevented or suppressed. In addition, the ability to impart a pretilt angle to liquid crystal molecules can also be improved.

Furthermore, the number of polymerizable groups may be two or three or more. By having two or more polymerizable groups, the crosslinking density of the polymer can be increased. Therefore, these can be more firmly fixed to the substrate, and the retention of liquid crystal molecules or the ability to impart a pretilt angle can be further improved.

The polymerizable group can be selected from the group represented by the following general formulas (P-1) to (P-13), for example.

(In the formula, the black dot on the right indicates the bonding key)

Since these polymerizable groups are highly reactive, they can be fully and reliably polymerized even at relatively low energy (for example, light energy, thermal energy). Therefore, when polymerizing the polymerizable monomer A and the polymerizable monomer B, it is possible to prevent or suppress the deterioration of the liquid crystal molecules due to adverse effects.

Among these, the polymerizable group is preferably a group represented by formula (P-1) to formula (P-3), and more preferably a group represented by formula (P-1) (acryloyl group) Or the group represented by formula (P-2) (methacryloyl group).

The two or more polymerizable groups possessed by the polymerizable monomer A may be the same or different from each other.

In addition, the two polymerizable groups are preferably bonded to almost symmetrical positions at both ends of the mesogen skeleton in the longitudinal direction. Thereby, the effect of imparting a pretilt angle to the liquid crystal molecules is further improved.

As said general polymerizable monomer A, the compound represented by following general formula (i-1-1)-(i-4-14) is mentioned.

In the formula, P ⁱ¹¹ , P ⁱ¹² , P ⁱ²¹ , P ⁱ²² , P ⁱ⁴¹ and P ⁱ⁴² each independently represent the aforementioned polymerizable group.

In addition, the ^mesogen skeleton may further have a substituent K ^{i1A bonded} to the ring structure instead of the substituent in the general formula (i-1-1) to (i-4-14), or not only these The substituent further has a substituent K ^i1A bonded to the ring structure.

Substituent K ^i1A represents halogen atom, linear or branched alkyl group with 1-40 carbon atoms, linear or branched haloalkyl group with 1-40 carbon atoms, linear or branched Chain cyanide alkyl group with 1-40 carbon atoms, or linear or branched alkoxy group with 1-40 carbon atoms, preferably halogen atom, linear or branched carbon Alkyl groups with 3-40 atoms, linear or branched halogenated alkyl groups with 3-40 carbon atoms, linear or branched cyanide alkyl groups with 3-40 carbon atoms, or straight A chain or branched alkoxy group having 3 to 40 carbon atoms, preferably a linear alkyl group having 3 to 40 carbon atoms, a linear halogenated alkyl group having 3 to 40 carbon atoms, Or a linear alkoxy group having 3 to 40 carbon atoms, preferably a linear alkyl group having 3 to 18 carbon atoms or a linear alkoxy group having 3 to 18 carbon atoms, preferably It is a straight-chain alkyl group with 3-12 carbon atoms or a straight-chain alkoxy group with 3-12 carbon atoms, preferably a straight-chain alkyl group with 3-8 carbon atoms or a straight-chain The alkoxy group with 3-8 carbon atoms.

Two or more secondary carbon atoms in this alkyl group can be substituted by -C(=X ⁱ¹ )- and/or -(CH-CN)-. The secondary carbon atoms in the above-mentioned alkyl group can not directly interact with oxygen atoms. The adjacent method is -C(=CH ₂ )-, -C(=CHR ⁱ³ )-, -C(=CR ⁱ³ ₂ )-, -CH=CH-, -C≡C-, -O-, -NH -, -COO- or -OCO- substitution, the end of the above-mentioned alkyl group can also be substituted by OH, NH ₂ or CN.

In the formula, X ⁱ¹ represents an oxygen atom, a sulfur atom, NH or NR ⁱ³ , and R ⁱ³ represents a linear or branched alkyl group with 1 to 20 carbon atoms (wherein, the secondary carbon atoms in this alkyl group can be The oxygen atoms are not directly adjacent to each other by -O-, -CH=CH- or -C≡C-).

The polymerizable monomer A has a ^mesogen skeleton having the substituent K ^i1A , so that a sufficient pretilt angle can be imparted to the liquid crystal molecules more reliably, and the change of the pretilt angle can be made more difficult to generate.

((Polymerizable monomer B)) The polymerizable monomer B has a mesogen skeleton and at least two polymerizable groups bonded to the mesogen skeleton. Then, all the polymerizable groups are bonded to the mesogen skeleton via the spacer.

By using the polymerizable monomer B in combination, the content of the polymerizable monomer A in the liquid crystal composition can be increased.

Here, as spacers, 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 carbon atoms 1～ 20 alkylene groups (wherein one of the alkylene groups or two or more non-adjacent -CH ₂ -can be substituted by -O-, -COO- or -OCO-).

Among them, the spacer is preferably a branched or linear alkylene group having 2 to 15 carbon atoms, and more preferably a branched or linear alkylene group having 3 to 10 carbon atoms. The polymerizable monomer B having a spacer has higher molecular mobility, so more polymerizable monomer A can be dissolved in the liquid crystal composition.

The mesogen skeleton preferably has 2 to 4 ring structures, and more preferably has 2 to 3 ring structures. By having the mesogen skeleton with this number of ring structures, the function of the polymerizable monomer B to impart a pretilt angle to the liquid crystal molecules can be further improved.

The plural ring structures contained in the mesogen skeleton may form a condensed polycyclic structure, and preferably form a connected polycyclic structure in which the ring structures are connected (bonded) by a single bond. Thereby, the mobility of the molecules of the polymerizable monomer B is further improved.

The polymerizable monomer B has at least two polymerizable groups. By polymerizing the polymerizable groups of polymerizable monomer A and polymerizable monomer B with each other, the polymer of polymerizable monomer A and polymerizable monomer B can be more firmly fixed to the substrate, and the liquid crystal molecules can be increased The retention. As a result, the ability to impart a pretilt angle can also be improved.

Furthermore, the number of polymerizable groups may be two or three or more. By having two or more polymerizable groups, the crosslinking density of the polymer can be increased. Therefore, these can be more firmly fixed to the substrate, and the retention of liquid crystal molecules or the ability to impart a pretilt angle can be further improved.

This polymerizable group is selected from the group represented by the said general formula (P-1)-(P-13), for example. Among these, the polymerizable group is preferably a group represented by formula (P-1) to formula (P-3), more preferably a group represented by formula (P-1) (acryloyl group) or The group represented by formula (P-2) (methacryloyl group).

The two or more polymerizable groups possessed by the polymerizable monomer B may be the same or different from each other.

The polymerizable monomer B preferably contains, for example, at least one selected from compounds represented by the following general formula (i-6-1).

In the formula, X represents a ring structure (aliphatic ring structure or aromatic ring structure), P represents a polymerizable group, Sp represents a spacer, a represents an integer from 0 to 2, and m, n, and o each independently represent 0 to 3 An integer, but m+n+o is 2 or more.

In addition, the polymerizable group P and the spacer Sp are the same as the aforementioned groups, respectively.

In addition, the ^mesogen skeleton may further have a substituent K ^i1B bonded to the ring structure X.

Substituent K ^i1B represents a halogen atom, a linear or branched alkyl group with 3 to 40 carbon atoms, a linear or branched halogenated alkyl group with 3 to 40 carbon atoms, a linear or branched A chain-shaped cyanide alkyl group with 3-40 carbon atoms, or a straight-chain or branched-chain alkoxy group with 3-40 carbon atoms.

Two or more secondary carbon atoms in this alkyl group can be substituted by -C(=X ⁱ¹ )- and/or -(CH-CN)-, the secondary carbon atoms in the alkyl group can be oxygen atoms not directly adjacent The method is -C(=CH ₂ )-, -C(=CHR ⁱ³ )-, -C(=CR ⁱ³ ₂ )-, -CH=CH-, -C≡C-, -O-, -NH- , -COO- or -OCO- substitution, the hydrogen atom in the alkyl group can be replaced by P-Sp-, and the end of the alkyl group can be replaced by OH, NH ₂ or CN.

In the formula, X ⁱ¹ represents an oxygen atom, a sulfur atom, NH or NR ⁱ³ , and R ⁱ³ represents a linear or branched alkyl group with 1 to 20 carbon atoms (wherein, the secondary carbon atoms in this alkyl group can be The oxygen atoms are not directly adjacent to each other by -O-, -CH=CH- or -C≡C-), P represents a polymerizable group, and Sp represents a spacer group) The polymerizable monomer B has this substituent The ^mesogen skeleton of K ^i1B can more reliably impart a sufficient pretilt angle to the liquid crystal molecules, and make the change of the pretilt angle more difficult to generate.

Substituent K ^i1B represents halogen atom, linear or branched alkyl group with 1-40 carbon atoms, linear or branched haloalkyl group with 1-40 carbon atoms, linear or branched Chain cyanide alkyl group with 1-40 carbon atoms, or linear or branched alkoxy group with 1-40 carbon atoms, preferably halogen atom, linear or branched carbon Alkyl groups with 3-40 atoms, linear or branched halogenated alkyl groups with 3-40 carbon atoms, linear or branched cyanide alkyl groups with 3-40 carbon atoms, or straight A chain or branched alkoxy group having 3 to 40 carbon atoms, preferably a linear alkyl group having 3 to 40 carbon atoms, a linear halogenated alkyl group having 3 to 40 carbon atoms, Or a linear alkoxy group having 3 to 40 carbon atoms, preferably a linear alkyl group having 3 to 18 carbon atoms or a linear alkoxy group having 3 to 18 carbon atoms, preferably It is a straight-chain alkyl group with 3-12 carbon atoms or a straight-chain alkoxy group with 3-12 carbon atoms, preferably a straight-chain alkyl group with 3-8 carbon atoms or a straight-chain The alkoxy group with 3-8 carbon atoms.

In addition, the polymerizable group P and the spacer Sp are the same as the aforementioned groups, respectively.

The polymerizable monomer B may be a compound having a spacer between the mesogen skeleton and each polymerizable group in the general formulas (i-1-1) to (i-4-14) (ie, two A compound in which a polymerizable group is bonded at almost symmetrical positions at both ends of the mesogen skeleton in the long axis direction), which may also be represented by the following formulas (i-6-11) to (i-6-13) Compound (that is, a compound in which two polymerizable groups are biased at one end of the long axis direction of the mesogen skeleton to bond).

The latter polymerizable monomer B is also preferable in that it can function in a manner of assisting the alignment control of liquid crystal molecules.

The amount of polymerizable monomer A relative to the total amount of polymerizable monomer A and polymerizable monomer B is preferably about 25 to 75% by mass, more preferably about 40 to 60% by mass. By using the polymerizable monomer A and the polymerizable monomer B in such a ratio, the pretilt angle imparted to the liquid crystal molecules can be larger, and the generation of IS can be appropriately prevented or suppressed.

The total amount of the polymerizable monomer A and the polymerizable monomer B contained in the liquid crystal composition is preferably about 0.1 to 3 parts by mass, more preferably about 0.2 to 2 parts by mass relative to 100 parts by mass of liquid crystal molecules. By setting the total amount of polymerizable monomer A and polymerizable monomer B in the above range, excellent VHR or high-speed response can be maintained.

((Liquid crystal molecules)) The liquid crystal molecules preferably contain at least one of the compounds represented by general formulas (N-1) to (N-3).

In the formula, R ^N11 , R ^N12 , R ^N21 , R ^N22 , R ^N31 and R ^N32 each independently represent an alkyl group having 1 to 8 carbon atoms, and any one of the alkyl groups or any two that are not adjacent More than one -CH ₂ -can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-.

A ^N11 , A ^N12 , A ^N21 , A ^N22 , A ^N31 and A ^N32 each independently represent a group selected from the group consisting of (a) ~ (d): (a) 1,4-cyclohexylene (the Any one or two or more non-adjacent ones in the group -CH ₂ -can be substituted by -O-), (b) 1,4-phenylene (any one or Two or more non-adjacent -CH= can be substituted by -N=), (c) naphthalene-2,6-diyl, 1,2,3,4-tetrahydronaphthalene-2,6-diyl or Decahydronaphthalene-2,6-diyl (any one or more than two non-adjacent ones present in the group-CH = can be replaced by -N =), and (d) 1,4- ring extension Hexenyl: The above-mentioned group (a), group (b), group (c) and group (d) may be independently substituted with a cyano group, a fluorine atom or a chlorine atom.

Z ^N11 , Z ^N12 , Z ^N21 , Z ^N22 , Z ^N31 and Z ^N32 each independently represent 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-.

X ^N21 represents a hydrogen atom or a fluorine atom.

T ^N31 represents -CH ₂ -or an oxygen atom.

n ^N11 , n ^N12 , n ^N21 , n ^N22 , n ^N31 and n ^N32 each independently represent an integer from 0 to 3, and n ^N11 +n ^N12 , n ^N21 +n ^N22 and n ^N31 +n ^N32 each independently represent 1, 2 or 3, when there are a plurality of A ^N11 to A ^N32 and Z ^N11 to Z ^N32 , they may be the same or different.

R ^N11 , R ^N12 , R ^N21 , R ^N22 , R ^N31 and R ^{N32 are} preferably each independently an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, and 2 to 8 alkenyl or C 2-8 alkenyloxy, more preferably C 1-5 alkyl, C 1-5 alkoxy, C 2-5 alkenyl or Alkenyloxy having 2 to 5 carbon atoms, more preferably alkyl having 1 to 5 carbon atoms or alkenyl having 2 to 5 carbon atoms, particularly preferably alkyl having 2 to 5 carbon atoms or carbon atoms The alkenyl group having 2 to 3 is most preferably an alkenyl group having 3 carbon atoms (propenyl).

In addition, when it is bonded to a benzene ring (aromatic ring) such a ring structure, it is preferably a linear alkyl group with 1 to 5 carbon atoms, and a linear alkyl group with 1 to 4 carbon atoms. An oxy group or an alkenyl group with 4 to 5 carbon atoms is preferably a straight-chain carbon when it is bonded to a saturated ring structure such as a cyclohexane ring, a pyran ring, or a dioxane ring. An alkyl group having 1 to 5 atoms, a linear alkoxy group having 1 to 4 carbon atoms, or a linear alkenyl group having 2 to 5 carbon atoms. Furthermore, in order to stabilize the nematic phase, the number of carbon atoms (when oxygen atoms are contained, the sum of the number of carbon atoms and the number of oxygen atoms) is preferably 5 or less, and it is also preferable to be linear.

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

The black dots in each formula represent the carbon atoms in the ring structure.

When an increase in Δn is required, A ^N11 , A ^N12 , A ^N21 , A ^N22 , A ^N31 and A ^{N32 are} preferably independently aromatic, and in order to improve the response speed, they are preferably aliphatic.

Specifically, A ^N11 , A ^N12 , A ^N21 , A ^N22 , A ^N31 and A ^{N32 are} preferably trans-1,4-cyclohexylene, 1,4-phenylene, 2-fluoro -1,4-phenylene, 3-fluoro-1,4-phenylene, 3,5-difluoro-1,4-phenylene, 2,3-difluoro-1,4-phenylene , 1,4-cyclohexenyl, 1,4-bicyclo[2.2.2]octyl, piperidine-1,4-diyl, naphthalene-2,6-diyl, decalin-2, 6-diyl or 1,2,3,4-tetrahydronaphthalene-2,6-diyl, more preferably any of the following groups, still more preferably trans-1,4-cyclohexylene , 1,4-cyclohexenylene or 1,4-phenylene.

Preferably, Z ^N11 , Z ^N12 , Z ^N21 , Z ^N22 , Z ^N31 and Z ^N32 are independently -CH ₂ O -, -CF ₂ O -, -CH ₂ CH ₂ -, -CF ₂ CF ₂ -or A single bond is more preferably -CH ₂ O-, -CH ₂ CH ₂ -or a single bond, and still more preferably -CH ₂ O- or a single bond.

X ^{N21 is} preferably a fluorine atom.

T ^{N31 is} preferably an oxygen atom.

Preferably, n ^N11 +n ^N12 , n ^N21 +n ^N22 and n ^N31 +n ^N32 are 1 or 2. Specifically, it is preferably a combination of n ^N11 being 1 and n ^N12 being 0, a combination of n ^N11 being 2 and n ^N12 being 0, a combination of n ^N11 being 1 and n ^N12 being 1, n ^N21 being 1 and n ^N22 It is a combination of 0, n ^N21 is 2 and n ^N22 is 0, n ^N31 is 1 and n ^N32 is 0, n ^N31 is 2 and n ^N32 is 0.

The amounts of the compounds represented by the general formulas (N-1) to (N-3) contained in the liquid crystal composition are preferably as follows, respectively. That is, the preferable lower limit is 1% by mass, 10% by mass, 20% by mass, 30% by mass, 40% by mass, 50% by mass, 55% by mass, 60% by mass, 65% by mass, 70% by mass, 75% by mass. Mass%, 80% by mass. On the other hand, the preferable upper limit is 95% by mass, 85% by mass, 75% by mass, 65% by mass, 55% by mass, 45% by mass, 35% by mass, 25% by mass, and 20% by mass.

In the case of keeping the viscosity (η) of the liquid crystal composition low and increasing the response speed, the amount of the compound represented by the general formula (N-1)~(N-3) is preferably such that the lower limit is low and the upper limit is lower The value is also low. Furthermore, when the nematic phase-isotropic liquid phase transition temperature (Tni) of the liquid crystal composition is maintained high to improve temperature stability, the amount is preferably lower in the lower limit and lower in the upper limit. Also, in the case of increasing the dielectric anisotropy (∆ε) of the liquid crystal composition in order to keep the driving voltage of the liquid crystal display element low, the amount is preferably such that the lower limit is high and the upper limit is also high .

As the compound represented by the general formula (N-1), compounds represented by the following general formulas (N-1a) to (N-1g) can be cited.

In the formula, R ^N11 and R ^N12 have the same meaning as R ^N11 and R ^N12 in the general formula (N-1).

n ^Na11 represents 0 or 1.

n ^Nb11 represents 1 or 2.

n ^Nc11 represents 0 or 1.

n ^Nd11 represents 1 or 2.

n ^Ne11 represents 1 or 2.

n ^Nf12 represents 1 or 2.

n ^Ng11 represents 1 or 2.

A ^Ne11 represents trans-1,4-cyclohexylene or 1,4-phenylene.

A ^Ng11 represents trans-1,4-cyclohexenylene, 1,4-cyclohexenylene or 1,4-phenylene, and at least one represents 1,4-cyclohexenylene.

Z ^Ne11 represents a single bond or an ethylene group, and at least one represents an ethylene group.

Among them, when there are a plurality of A ^Ne11 , Z ^Ne11 and/or A ^Ng11 , they may be the same or different.

More specifically, the compound represented by the general formula (N-1) is preferably selected from compounds represented by the following general formulas (N-1-1) to (N-1-21).

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

In the formula, R ^N111 and R ^N112 respectively 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, 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, more preferably an ethoxy group or a butoxy group.

The compound represented by general formula (N-1-1) may be used individually by 1 type, and may use 2 or more types together.

The type of compound that can be used in combination is not particularly limited, and is appropriately selected according to the required properties such as solubility at low temperature, transition temperature, electrical reliability, and birefringence.

The types of compounds used are, for example, 1, 2, 3, 4, 5 or more in one embodiment of the present invention.

The amount of the compound represented by the general formula (N-1-1) contained in the liquid crystal composition is preferably set to be larger when the improvement of ∆ε is important, and when the solubility at low temperature is important If it is set more, the effect will be higher, and if Tni is important, if it is set less, the effect will be higher. Furthermore, in the case of improving dripping or afterimage characteristics, it is preferable to set the range of the amount in the middle.

The preferred lower limit values are 5% by mass, 10% by mass, 13% by mass, 15% by mass, 17% by mass, 20% by mass, 23% by mass, 25% by mass, 27% by mass, 30% by mass, 33% by mass, 35 mass%. On the other hand, the preferred upper limit values are 50% by mass, 40% by mass, 38% by mass, 35% by mass, 33% by mass, 30% by mass, 28% by mass, 25% by mass, 23% by mass, 20% by mass, 18 mass%, 15 mass%, 13 mass%, 10 mass%, 8 mass%, 7 mass%, 6 mass%, 5 mass%, 3 mass%.

Furthermore, the compound represented by the general formula (N-1-1) is preferably selected from compounds represented by the following formulas (N-1-1.1) to (N-1-1.25), and more preferably selected from the following The compounds represented by the formulas (N-1-1.1) to (N-1-1.4) are more preferably selected from compounds represented by the following formulas (N-1-1.1) and (N-1-1.3).

The compounds represented by the formulas (N-1-1.1) to (N-1-1.25) may be used singly or in combination of two or more.

The amount of the compounds represented by formulas (N-1-1.1) to (N-1-1.25) contained in the liquid crystal composition when used alone or in combination is preferably as follows. That is, the preferred lower limit values are 5 mass%, 10 mass%, 13 mass%, 15 mass%, 17 mass%, 20 mass%, 23 mass%, 25 mass%, 27 mass%, 30 mass%, 33 Mass%, 35 mass%. On the other hand, the preferred upper limit values are 50% by mass, 40% by mass, 38% by mass, 35% by mass, 33% by mass, 30% by mass, 28% by mass, 25% by mass, 23% by mass, 20% by mass, 18 mass%, 15 mass%, 13 mass%, 10 mass%, 8 mass%, 7 mass%, 6 mass%, 5 mass%, 3 mass%.

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

In the formula, ^RN121 and ^RN122 independently represent the same meaning as ^RN11 and ^RN12 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, propyl, butyl or pentyl group.

R ^{N122 is} preferably an alkyl group with 1 to 5 carbon atoms, an alkenyl group with 4 to 5 carbon atoms, or an alkoxy group with 1 to 4 carbon atoms, more preferably methyl, propyl, methoxy, ethyl Oxy or propoxy.

The compound represented by general formula (N-1-2) may be used individually by 1 type, and may use 2 or more types together.

The type of compound that can be used in combination is not particularly limited, and is appropriately selected according to the required properties such as solubility at low temperature, transition temperature, electrical reliability, and birefringence.

The types of compounds used are, for example, 1, 2, 3, 4, 5 or more in one embodiment of the present invention.

The amount of the compound represented by the general formula (N-1-2) contained in the liquid crystal composition is preferably set to be larger when the improvement of ∆ε is important, and when the solubility at low temperature is important If it is set to less, the effect is higher, and when Tni is important, if it is set to more, the effect is higher. Furthermore, in the case of improving dripping or afterimage characteristics, it is preferable to set the range of the amount in the middle.

The preferred lower limit values are 5% by mass, 7% by mass, 10% by mass, 13% by mass, 15% by mass, 17% by mass, 20% by mass, 23% by mass, 25% by mass, 27% by mass, 30% by mass, 33 mass%, 35 mass%, 37 mass%, 40 mass%, 42 mass%. On the other hand, the preferred upper limit values are 50% by mass, 48% by mass, 45% by mass, 43% by mass, 40% by mass, 38% by mass, 35% by mass, 33% by mass, 30% by mass, 28% by mass, 25 mass%, 23 mass%, 20 mass%, 18 mass%, 15 mass%, 13 mass%, 10 mass%, 8 mass%, 7 mass%, 6 mass%, 5 mass%.

Furthermore, the compound represented by the general formula (N-1-2) is preferably selected from the compounds represented by the following formulas (N-1-2.1) to (N-1-2.25), and more preferably selected from the formula ( N-1－2.3)～(N－1－2.7), formula (N－1-2.10), formula (N－1-2.11), formula (N－1-2.13) and formula (N－1-2.20) The compound represented.

Furthermore, when the compound represented by the general formula (N-1-2) emphasizes the improvement of Δε, it is preferably selected from the compounds represented by the formula (N-1-2.3) to (N-1-2.7) When the improvement of Tni is emphasized, it is preferable to select compounds represented by formula (N-1-2.10), formula (N-1-2.11) and formula (N-1-2.13), and the response speed is important In the case of improvement, it is preferably a compound represented by formula (N-1-2.20).

The compounds represented by formulas (N-1-2.1) to (N-1-2.25) may be used alone or in combination of two or more.

The amount of the compound represented by formula (N-1-2.1) to (N-1-2.25) contained in the liquid crystal composition when used alone or in combination is preferably as follows. That is, the preferred lower limit values are 5 mass%, 10 mass%, 13 mass%, 15 mass%, 17 mass%, 20 mass%, 23 mass%, 25 mass%, 27 mass%, 30 mass%, 33 Mass%, 35 mass%. On the other hand, the preferred upper limit values are 50% by mass, 40% by mass, 38% by mass, 35% by mass, 33% by mass, 30% by mass, 28% by mass, 25% by mass, 23% by mass, 20% by mass, 18 mass%, 15 mass%, 13 mass%, 10 mass%, 8 mass%, 7 mass%, 6 mass%, 5 mass%, 3 mass%.

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

In the formula, R ^N131 and R ^N132 respectively 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 with 1 to 5 carbon atoms, an alkenyl group with 3 to 5 carbon atoms, or an alkoxy group with 1 to 4 carbon atoms, more preferably 1-propenyl, ethoxy, or propoxy基 or butoxy.

The compound represented by general formula (N-1-3) may be used individually by 1 type, and may use 2 or more types together.

The type of compound that can be used in combination is not particularly limited, and is appropriately selected according to the required properties such as solubility at low temperature, transition temperature, electrical reliability, and birefringence.

The types of compounds used are, for example, 1, 2, 3, 4, 5 or more in one embodiment of the present invention.

The amount of the compound represented by the general formula (N-1－3) contained in the liquid crystal composition is preferably set to be larger when the improvement of Δε is important, and when the solubility at low temperature is important If it is set more, the effect will be higher, and if Tni is important, if it is set more, the effect will be higher. Furthermore, in the case of improving dripping or afterimage characteristics, it is preferable to set the range of the amount in the middle.

The preferred lower limit values are 5 mass%, 10 mass%, 13 mass%, 15 mass%, 17 mass%, and 20 mass%. On the other hand, the preferable upper limit values are 35% by mass, 30% by mass, 28% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass, 15% by mass, and 13% by mass.

Furthermore, the compound represented by the general formula (N-1-3) is preferably selected from the compounds represented by the formulas (N-1-3.1) to (N-1-3.21), more preferably selected from the formula (N- 1-3.1) ~ (N-1-3.7) and the compound represented by formula (N-1-3.21), more preferably selected from formula (N-1-3.1), formula (N-1-3.2), Compounds represented by formula (N-1-3.3), formula (N-1-3.4) and formula (N-1-3.6).

The compounds represented by formula (N-1-3.1)～(N-1-3.4), formula (N-1-3.6) and formula (N-1-3.21) can be used alone or in combination of two or more, It is preferably a combination of a compound represented by formula (N-1-3.1) and a compound represented by formula (N-1-3.2), selected from formula (N-1-3.3), formula (N-1-3.4) And a combination of 2 or 3 of the formula (N-1-3.6).

When the compounds represented by the formulas (N-1-3.1) to (N-1-3.4), (N-1-3.6) and (N-1-3.21) contained in the liquid crystal composition are used alone or in combination The amount is preferably as shown below. That is, the preferable lower limit values are 5 mass%, 10 mass%, 13 mass%, 15 mass%, 17 mass%, and 20 mass%. On the other hand, the upper limit value is 35 mass%, 30 mass%, 28 mass%, 25 mass%, 23 mass%, 20 mass%, 18 mass%, 15 mass%, 13 mass%.

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

In the formula, R ^N141 and R ^N142 independently represent the same meaning as R ^N11 and R ^N12 in the general formula (N-1).

R ^N141 and R ^{N142 are} preferably each independently an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, more preferably a methyl group or a propyl group. Group, ethoxy or butoxy.

The compound represented by general formula (N-1-4) may be used individually by 1 type, and may use 2 or more types together.

The type of compound that can be used in combination is not particularly limited, and is appropriately selected according to the required properties such as solubility at low temperature, transition temperature, electrical reliability, and birefringence.

The types of compounds used are, for example, 1, 2, 3, 4, 5 or more in one embodiment of the present invention.

The amount of the compound represented by the general formula (N-1－4) contained in the liquid crystal composition is preferably set to be larger when the improvement of Δε is important, and when the solubility at low temperature is important If it is set more, the effect will be higher, and if Tni is important, if it is set less, the effect will be higher. Furthermore, in the case of improving dripping or afterimage characteristics, it is preferable to set the range of the amount in the middle.

The preferred lower limit values are 3% by mass, 5% by mass, 7% by mass, 10% by mass, 13% by mass, 15% by mass, 17% by mass, and 20% by mass. On the other hand, the preferable upper limit values are 35% by mass, 30% by mass, 28% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass, 15% by mass, 13% by mass, 11% by mass, 10% by mass, 8% by mass.

Furthermore, the compound represented by general formula (N-1-4) is preferably selected from compounds represented by formulas (N-1-4.1) to (N-1-4.24), and more preferably selected from compounds represented by formula (N- The compound represented by 1-4.1) ~ (N-1-4.4) is preferably selected from the group consisting of formula (N-1-4.1), formula (N-1-4.2) and formula (N-1-4.4) The compound.

The compounds represented by formulas (N-1-4.1) to (N-1-4.24) may be used alone or in combination of two or more.

The amount of the compounds represented by formulas (N-1-4.1) to (N-1-4.24) contained in the liquid crystal composition when used alone or in combination is preferably as follows. That is, the preferred lower limit values are 3% by mass, 5% by mass, 7% by mass, 10% by mass, 13% by mass, 15% by mass, 17% by mass, and 20% by mass. On the other hand, the upper limit value is 35% by mass, 30% by mass, 28% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass, 15% by mass, 13% by mass, 11% by mass, 10 Mass%, 8 mass%.

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

In the formula, R ^N151 and R ^N152 respectively independently represent the same meaning as R ^N11 and R ^N12 in the general formula (N-1).

R ^N151 and R ^{N152 are} preferably each independently an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, preferably ethyl or propylene.基 or butyl.

The compound represented by general formula (N-1-5) may be used individually by 1 type, and may use 2 or more types together.

The type of compound that can be used in combination is not particularly limited, and is appropriately selected according to the required properties such as solubility at low temperature, transition temperature, electrical reliability, and birefringence.

The types of compounds used are, for example, 1, 2, 3, 4, 5 or more in one embodiment of the present invention.

The amount of the compound represented by the general formula (N-1-5) contained in the liquid crystal composition is preferably set to be larger when the improvement of ∆ε is important, and when the solubility at low temperature is important If it is set to less, the effect is higher, and when Tni is important, if it is set to more, the effect is higher. Furthermore, in the case of improving dripping or afterimage characteristics, it is preferable to set the range of the amount in the middle.

The preferred lower limit values are 5% by mass, 8% by mass, 10% by mass, 13% by mass, 15% by mass, 17% by mass, and 20% by mass. The preferred upper limit of the content is 35% by mass, 33% by mass, 30% by mass, 28% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass relative to the total amount of the composition of the present invention %, 15% by mass, and 13% by mass.

Furthermore, the compound represented by general formula (N-1-5) is preferably selected from compounds represented by formulas (N-1-5.1) to (N-1-5.12), and more preferably selected from compounds represented by formula (N- 1-5.1), the compound represented by the formula (N-1-5.2) and the formula (N-1-5.4).

The compounds represented by the formula (N-1-5.1), the formula (N-1-5.2) and the formula (N-1-5.4) may be used alone or in combination of two or more.

The amount of the compound represented by formula (N-1-5.1), formula (N-1-5.2) and formula (N-1-5.4) contained in the liquid crystal composition when used alone or in combination is preferably as follows . That is, the preferred lower limit values are 5 mass%, 8 mass%, 10 mass%, 13 mass%, 15 mass%, 17 mass%, and 20 mass%. On the other hand, the preferable upper limit values are 35% by mass, 33% by mass, 30% by mass, 28% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass, 15% by mass, and 13% by mass.

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

In the formula, R ^N1101 and R ^N1102 respectively 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, propyl, butyl, vinyl, or 1-propenyl group.

R ^{N1102 is} preferably an alkyl group with 1 to 5 carbon atoms, an alkenyl group with 4 to 5 carbon atoms, or an alkoxy group with 1 to 4 carbon atoms, more preferably ethoxy, propoxy or butoxy .

The compound represented by general formula (N-1-10) may be used individually by 1 type, and may use 2 or more types together.

The type of compound that can be used in combination is not particularly limited, and is appropriately selected according to the required properties such as solubility at low temperature, transition temperature, electrical reliability, and birefringence.

The types of compounds used are, for example, 1, 2, 3, 4, 5 or more in one embodiment of the present invention.

The amount of the compound represented by the general formula (N-1-10) contained in the liquid crystal composition is preferably set to be more when the improvement of ∆ε is important, and when the solubility at low temperature is important If it is set more, the effect will be higher, and if Tni is important, if it is set less, the effect will be higher. Furthermore, in the case of improving dripping or afterimage characteristics, it is preferable to set the range of the amount in the middle.

The preferred lower limit values are 5 mass%, 10 mass%, 13 mass%, 15 mass%, 17 mass%, and 20 mass%. On the other hand, the preferable upper limit values are 35% by mass, 30% by mass, 28% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass, 15% by mass, and 13% by mass.

Furthermore, the compound represented by general formula (N-1-10) is preferably selected from compounds represented by formulas (N-1-10.1) to (N-1-10.14), and more preferably selected from compounds represented by formula (N- The compounds represented by 1-10.1) to (N-1-10.5) are more preferably selected from compounds represented by formula (N-1-10.1) and formula (N-1-10.2).

The compound represented by formula (N-1-10.1) and formula (N-1-10.2) may be used individually by 1 type, and may use 2 or more types together.

The amount of the compound represented by formula (N-1-10.1) and formula (N-1-10.2) contained in the liquid crystal composition when used alone or in combination is preferably as follows. That is, the preferable lower limit values are 5 mass%, 10 mass%, 13 mass%, 15 mass%, 17 mass%, and 20 mass%. On the other hand, the preferable upper limit values are 35% by mass, 30% by mass, 28% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass, 15% by mass, and 13% by mass.

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

In the formula, R ^N1111 and R ^N1112 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, propyl, butyl, vinyl, or 1-propenyl group.

R ^{N1112 is} preferably an alkyl group with 1 to 5 carbon atoms, an alkenyl group with 4 to 5 carbon atoms, or an alkoxy group with 1 to 4 carbon atoms, more preferably ethoxy, propoxy or butoxy .

The compound represented by general formula (N-1-11) may be used individually by 1 type, and may use 2 or more types together.

The type of compound that can be used in combination is not particularly limited, and is appropriately selected according to the required properties such as solubility at low temperature, transition temperature, electrical reliability, and birefringence.

The types of compounds used are, for example, 1, 2, 3, 4, 5 or more in one embodiment of the present invention.

The amount of the compound represented by the general formula (N-1-11) contained in the liquid crystal composition is preferably set to be larger when the improvement of ∆ε is important, and when the solubility at low temperature is important If it is set to less, the effect is higher, and when Tni is important, if it is set to more, the effect is higher. Furthermore, in the case of improving dripping or afterimage characteristics, it is preferable to set the range of the amount in the middle.

The preferred lower limit values are 5 mass%, 10 mass%, 13 mass%, 15 mass%, 17 mass%, and 20 mass%. On the other hand, the preferable upper limit values are 35% by mass, 30% by mass, 28% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass, 15% by mass, and 13% by mass.

Furthermore, the compound represented by the general formula (N-1-11) is preferably selected from the compounds represented by the formulas (N-1-11. 1) to (N-1-11.14), and more preferably is selected from the formula (N- The compounds represented by 1-11.1) to (N-1-11.14) are more preferably selected from compounds represented by formula (N-1-11.2) and formula (N-1-11.4).

The compounds represented by the formula (N-1-11.2) and the formula (N-1-11.4) may be used singly, or two or more of them may be used in combination.

The amount of the compound represented by formula (N-1-11.2) and formula (N-1-11.4) contained in the liquid crystal composition when used alone or in combination is preferably as follows. That is, the preferable lower limit values are 5 mass%, 10 mass%, 13 mass%, 15 mass%, 17 mass%, and 20 mass%. On the other hand, the preferable upper limit values are 35% by mass, 30% by mass, 28% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass, 15% by mass, and 13% by mass.

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

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

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, propyl or butyl group.

R ^{N1122 is} preferably an alkyl group with 1 to 5 carbon atoms, an alkenyl group with 4 to 5 carbon atoms, or an alkoxy group with 1 to 4 carbon atoms, more preferably ethoxy, propoxy or butoxy .

The compound represented by general formula (N-1-12) may be used individually by 1 type, and may use 2 or more types together.

The type of compound that can be used in combination is not particularly limited, and is appropriately selected according to the required properties such as solubility at low temperature, transition temperature, electrical reliability, and birefringence.

The types of compounds used are, for example, 1, 2, 3, 4, 5 or more in one embodiment of the present invention.

The amount of the compound represented by the general formula (N-1-12) contained in the liquid crystal composition is preferably set to be larger when the improvement of ∆ε is important, and when the solubility at low temperature is important If it is set more, the effect will be higher, and if Tni is important, if it is set less, the effect will be higher. Furthermore, in the case of improving dripping or afterimage characteristics, it is preferable to set the range of the amount in the middle.

The preferred lower limit values are 5 mass%, 10 mass%, 13 mass%, 15 mass%, 17 mass%, and 20 mass%. On the other hand, the preferable upper limit values are 35% by mass, 30% by mass, 28% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass, 15% by mass, and 13% by mass.

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

^Wherein, R N1131 and ^R N1132 each independently represent the same as in the general formula (N-1) in the meaning of R ^N11 and R ^N12.

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 with 1 to 5 carbon atoms, an alkenyl group with 4 to 5 carbon atoms, or an alkoxy group with 1 to 4 carbon atoms, more preferably ethoxy, propoxy or butoxy .

The compound represented by general formula (N-1-13) may be used individually by 1 type, and may use 2 or more types together.

The type of compound that can be used in combination is not particularly limited, and is appropriately selected according to the required properties such as solubility at low temperature, transition temperature, electrical reliability, and birefringence.

The types of compounds used are, for example, 1, 2, 3, 4, 5 or more in one embodiment of the present invention.

The amount of the compound represented by the general formula (N-1-13) contained in the liquid crystal composition is preferably set to be larger when the improvement of ∆ε is important, and when the solubility at low temperature is important If it is set more, the effect will be higher, and if Tni is important, if it is set more, the effect will be higher. Furthermore, in the case of improving dripping or afterimage characteristics, it is preferable to set the range of the amount in the middle.

The preferred lower limit values are 5 mass%, 10 mass%, 13 mass%, 15 mass%, 17 mass%, and 20 mass%. On the other hand, the preferable upper limit values are 35% by mass, 30% by mass, 28% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass, 15% by mass, and 13% by mass.

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

In the formula, R ^N1141 and R ^N1142 respectively 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, more preferably a methyl group, an ethyl group, a propyl group or a butyl group.

R ^{N1142 is} preferably an alkyl group with 1 to 5 carbon atoms, an alkenyl group with 4 to 5 carbon atoms, or an alkoxy group with 1 to 4 carbon atoms, more preferably ethoxy, propoxy or butoxy .

The compound represented by general formula (N-1-14) may be used individually by 1 type, and may use 2 or more types together.

The type of compound that can be used in combination is not particularly limited, and is appropriately selected according to the required properties such as solubility at low temperature, transition temperature, electrical reliability, and birefringence.

The types of compounds used are, for example, 1, 2, 3, 4, 5 or more in one embodiment of the present invention.

The amount of the compound represented by the general formula (N-1-14) contained in the liquid crystal composition is preferably set to be more when the improvement of ∆ε is important, and when the solubility at low temperature is important If it is set more, the effect will be higher, and if Tni is important, if it is set more, the effect will be higher. Furthermore, in the case of improving dripping or afterimage characteristics, it is preferable to set the range of the amount in the middle.

The preferred lower limit values are 5 mass%, 10 mass%, 13 mass%, 15 mass%, 17 mass%, and 20 mass%. On the other hand, the preferable upper limit values are 35% by mass, 30% by mass, 28% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass, 15% by mass, and 13% by mass.

Furthermore, the compound represented by the general formula (N-1-14) is preferably selected from compounds represented by the formulas (N-1-14.1) to (N-1-14.5), and more preferably selected from the formula (N- The compounds represented by 1-14.1) to (N-1-14.3) are more preferably selected from the compounds represented by formula (N-1-14.2) and formula (N-1-14.3).

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

In the formula, R ^N1201 and R ^N1202 respectively independently represent the same meaning as R ^N11 and R ^N12 in the general formula (N-1).

R ^N1201 and R ^{N1202 are} preferably each independently 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 general formula (N-1-20) may be used individually by 1 type, and may use 2 or more types together.

The type of compound that can be used in combination is not particularly limited, and is appropriately selected according to the required properties such as solubility at low temperature, transition temperature, electrical reliability, and birefringence.

The types of compounds used are, for example, 1, 2, 3, 4, 5 or more in one embodiment of the present invention.

The amount of the compound represented by the general formula (N-1-20) contained in the liquid crystal composition is preferably set to be more when the improvement of ∆ε is important, and when the solubility at low temperature is important If it is set more, the effect will be higher, and if Tni is important, if it is set more, the effect will be higher. Furthermore, in the case of improving dripping or afterimage characteristics, it is preferable to set the range of the amount in the middle.

The preferred lower limit values are 5 mass%, 10 mass%, 13 mass%, 15 mass%, 17 mass%, and 20 mass%. On the other hand, the preferable upper limit values are 35% by mass, 30% by mass, 28% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass, 15% by mass, and 13% by mass.

The compound represented by the general formula (N-1-21) is the following compound.

In the formula, R ^N1211 and R ^N1212 independently represent the same meaning as R ^N11 and R ^N12 in the general formula (N-1).

R ^N1211 and R ^{N1212 are} preferably independently 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 general formula (N-1-21) may be used individually by 1 type, and may use 2 or more types together.

The type of compound that can be used in combination is not particularly limited, and is appropriately selected according to the required properties such as solubility at low temperature, transition temperature, electrical reliability, and birefringence.

The types of compounds used are, for example, 1, 2, 3, 4, 5 or more in one embodiment of the present invention.

The amount of the compound represented by the general formula (N-1-21) contained in the liquid crystal composition is preferably set to be larger when the improvement of ∆ε is important, and when the solubility at low temperature is important If it is set more, the effect will be higher, and if Tni is important, if it is set more, the effect will be higher. Furthermore, in the case of improving dripping or afterimage characteristics, it is preferable to set the range of the amount in the middle.

The preferred lower limit values are 5 mass%, 10 mass%, 13 mass%, 15 mass%, 17 mass%, and 20 mass%. On the other hand, the preferable upper limit values are 35% by mass, 30% by mass, 28% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass, 15% by mass, and 13% by mass.

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

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

R ^N1221 and R ^{N1222 are} preferably each independently 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 general formula (N-1-22) may be used individually by 1 type, and may use 2 or more types together.

The type of compound that can be used in combination is not particularly limited, and is appropriately selected according to the required properties such as solubility at low temperature, transition temperature, electrical reliability, and birefringence.

The types of compounds used are, for example, 1, 2, 3, 4, 5 or more in one embodiment of the present invention.

The amount of the compound represented by the general formula (N-1-22) contained in the liquid crystal composition is preferably set to be larger when the improvement of ∆ε is important, and when the solubility at low temperature is important If it is set more, the effect will be higher, and if Tni is important, if it is set more, the effect will be higher. Furthermore, in the case of improving dripping or afterimage characteristics, it is preferable to set the range of the amount in the middle.

The preferred lower limit values are 1% by mass, 5% by mass, 10% by mass, 13% by mass, 15% by mass, 17% by mass, and 20% by mass. On the other hand, the preferable upper limit values are 35% by mass, 30% by mass, 28% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass, 15% by mass, 13% by mass, 10% by mass, 5 mass%.

Furthermore, the compound represented by general formula (N-1-22) is preferably selected from compounds represented by formulas (N-1-22.1) to (N-1-22.12), and more preferably selected from formula (N- The compounds represented by 1-22.1) to (N-1-22.5) are more preferably selected from compounds represented by formulas (N-1-22.1) to (N-1-22.4).

The liquid crystal composition may further contain at least one compound (liquid crystal molecule) selected from the group consisting of the following general formula (L). The compound represented by the general formula (L) does not have dielectric anisotropy or is extremely low. Therefore, by blending the compound into the liquid crystal composition, various characteristics of the liquid crystal composition can be adjusted.

In the formula, R ^L1 and R ^L2 each independently represent an alkyl group with 1 to 8 carbon atoms, and any one or two or more non-adjacent -CH ₂ -existing in the alkyl group can be independently -CH=CH-, -C≡C-, -O-, -CO-, -COO- or -OCO- replaced.

n ^L1 represents 0, 1, 2 or 3.

A ^L1 , A ^L2 and A ^L3 each independently represent a group selected from the group consisting of (a)～(c): (a) 1,4-cyclohexylene (any one or Two or more non-adjacent -CH ₂ -can be substituted by -O-)), (b) 1,4-phenylene (any one or more than two non-adjacent existing in the group -CH= can be substituted by -N=), and (c) naphthalene-2,6-diyl, 1,2,3,4-tetrahydronaphthalene-2,6-diyl or decalin-2,6 -Diyl group (any one or two or more of the groups that are not adjacent to each other-CH = can be substituted by -N =) The above group (a), group (b) and group (c) can be independent Ground is substituted by a cyano group, a fluorine atom or a chlorine atom.

Z ^L1 and Z ^L2 each independently represent 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-.

When n ^L1 is 2 or 3 and there are a plurality of A ^L2s , they may be the same or different.

When n ^L1 is 2 or 3 and there are a plurality of Z ^L3s , they may be the same or different.

Among them, the compounds represented by general formulas (N-1), (N-2) and (N-3) are not included.

The compound represented by the general formula (L) may be used singly or in combination of two or more kinds.

The type of compound that can be used in combination is not particularly limited, and is appropriately selected according to the 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 of the present invention. Alternatively, the type of compound used is 2, 3, 4, 5, 6, 7, 8, 9, 10 or more in another embodiment of the present invention.

The amount of the compound represented by the general formula (L) contained in the liquid crystal composition is based on the solubility at low temperature, transition temperature, electrical reliability, birefringence, process adaptability, drip marks, residual image, and dielectric. The required performance such as guidance is adjusted appropriately.

The preferred lower limit values are 1% by mass, 10% by mass, 20% by mass, 30% by mass, 40% by mass, 50% by mass, 55% by mass, 60% by mass, 65% by mass, 70% by mass, 75% by mass, 80% by mass. On the other hand, the preferable upper limit values are 95% by mass, 85% by mass, 75% by mass, 65% by mass, 55% by mass, 45% by mass, 35% by mass, and 25% by mass.

When it is necessary to keep the viscosity of the liquid crystal composition low and increase the response speed, it is preferable that the above-mentioned lower limit value is higher and the upper limit value is higher. Furthermore, when it is necessary to keep the Tni of the liquid crystal composition high and improve the temperature stability, it is preferable that the above-mentioned lower limit value is higher and the upper limit value is also higher. Moreover, when it is desired to increase the dielectric anisotropy of the liquid crystal composition in order to keep the driving voltage of the liquid crystal composition low, it is preferable that the above-mentioned lower limit value is lower and the upper limit value is also lower.

When reliability is important, it is preferable that both R ^L1 and R ^L2 are alkyl groups. When reducing volatility is important, it is preferable that both R ^L1 and R ^L2 are alkoxy groups. In the case of the viscosity of the composition, it is preferable that at least one of R ^L1 and R ^L2 is an alkenyl group.

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

When R ^L1 and R ^L2 are bonded to a benzene ring (aromatic ring) such a ring structure, it is preferably a linear alkyl group with 1 to 5 carbon atoms, and a linear chain with 1 to carbon atoms. The alkoxy group of 4 or the alkenyl group with 4 to 5 carbon atoms, when it is bonded to a saturated ring structure such as a cyclohexane ring, a pyran ring, or a dioxane ring, is preferably A straight-chain alkyl group with 1 to 5 carbon atoms, a straight-chain alkoxy group with 1 to 4 carbon atoms, or a straight-chain alkenyl group with 2 to 5 carbon atoms. Furthermore, in order to stabilize the nematic phase, the number of carbon atoms (in the case of containing oxygen atoms, the sum of the number of carbon atoms and the number of oxygen atoms) is preferably 5 or less, and it is also preferred to be linear .

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

The black dots in each formula represent the carbon atoms in the ring structure.

When the response speed is important, n ^{L1 is} preferably 0, in order to improve the upper limit temperature of the nematic phase, it is preferably 2 or 3, and in order to obtain a balance of these, it is preferably 1. Moreover, in order to satisfy the characteristics required as a liquid crystal composition, it is preferable to use a plurality of compounds represented by the general formula (L) in which n ^L1 has different values.

When it is required to increase Δn, it is preferable that A ^L1 , A ^{L 2} and A ^L3 are each independently aromatic. In order to improve the response speed, it is preferable to be aliphatic.

Specifically, it is preferable that A ^L1 , A ^L2 and A ^L3 are each independently trans-1,4-cyclohexylene, 1,4-phenylene, 2-fluoro-1,4-phenylene, 3-fluoro-1,4-phenylene, 3,5-difluoro-1,4-phenylene, 1,4-cyclohexenylene, 1,4-bicyclo[2.2.2]octylene , Piperidine-1,4-diyl, naphthalene-2,6-diyl, decalin-2,6-diyl, or 1,2,3,4-tetrahydronaphthalene-2,6-diyl , More preferably any one of the following groups, and still more preferably trans-1,4-cyclohexylene or 1,4-phenylene.

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

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

More specifically, the compound represented by the general formula (L) is preferably selected from compounds represented by the following general formulas (L-1) to (L-7).

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

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

Preferably, R ^L11 and R ^L12 are each independently a linear alkyl group with 1 to 5 carbon atoms, a linear chain alkoxy group with 1 to 4 carbon atoms, or a linear chain with 2 to carbon atoms. 5 of alkenyl.

The compound represented by the general formula (L-1) may be used alone or in combination of two or more.

The type of compound that can be used in combination is not particularly limited, and is appropriately selected according to the required properties such as solubility at low temperature, transition temperature, electrical reliability, and birefringence.

The types of compounds used are, for example, 1, 2, 3, 4, 5 or more in one embodiment of the present invention.

The amount of the compound represented by the general formula (L-1) contained in the liquid crystal composition is set as follows. That is, the preferred lower limit values are 1% by mass, 2% by mass, 3% by mass, 5% by mass, 7% by mass, 10% by mass, 15% by mass, 20% by mass, 25% by mass, 30% by mass, 35 Mass%, 40 mass%, 45 mass%, 50 mass%, 55 mass%. On the other hand, the preferred upper limit values are 95% by mass, 90% by mass, 85% by mass, 80% by mass, 75% by mass, 70% by mass, 65% by mass, 60% by mass, 55% by mass, 50% by mass, 45 mass%, 40 mass%, 35 mass%, 30 mass%, 25 mass%.

When it is necessary to keep the viscosity of the liquid crystal composition low and increase the response speed, it is preferable that the above-mentioned lower limit value is higher and the upper limit value is higher. Furthermore, when it is necessary to keep the Tni of the liquid crystal composition high and improve the temperature stability, it is preferable that the above-mentioned lower limit is moderate and the upper limit is moderate. Furthermore, in the case of increasing the dielectric anisotropy of the liquid crystal composition in order to keep the driving voltage of the liquid crystal composition low, it is preferable that the above-mentioned lower limit is lower and the upper limit is lower.

The compound represented by the general formula (L-1) is preferably selected from compounds represented by the general formula (L-1-1).

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

The compound represented by general formula (L-1-1) is preferably selected from compounds represented by formulas (L-1-1.1) to (L-1-1.3), and more preferably selected from compounds represented by formulas (L-1- 1.2) and the compound represented by the formula (L-1-1.3), and more preferably the compound represented by the formula (L-1-1.3).

The amount of the compound represented by formula (L-1-1.3) contained in the liquid crystal composition is preferably as follows. That is, the preferred lower limit values are 1% by mass, 2% by mass, 3% by mass, 5% by mass, 7% by mass, and 10% by mass. On the other hand, the preferred upper limit values are 20% by mass, 15% by mass, 13% by mass, 10% by mass, 8% by mass, 7% by mass, 6% by mass, 5% by mass, and 3% by mass.

The compound represented by the general formula (L-1) is preferably selected from compounds represented by the general formula (L-1-2).

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

The amount of the compound represented by formula (L-1-2) contained in the liquid crystal composition is preferably as follows. That is, the preferred lower limit values are 1% by mass, 5% by mass, 10% by mass, 15% by mass, 17% by mass, 20% by mass, 23% by mass, 25% by mass, 27% by mass, 30% by mass, 35 quality%. On the other hand, the preferable upper limit values are 60% by mass, 55% by mass, 50% by mass, 45% by mass, 42% by mass, 40% by mass, 38% by mass, 35% by mass, 33% by mass, and 30% by mass.

The amount of the compound represented by formula (L-1-2) contained in the liquid crystal composition is preferably as follows. That is, the preferred lower limit values are 1% by mass, 5% by mass, 10% by mass, 15% by mass, 17% by mass, 20% by mass, 23% by mass, 25% by mass, 27% by mass, 30% by mass, 35 quality%. On the other hand, the preferable upper limit values are 60% by mass, 55% by mass, 50% by mass, 45% by mass, 42% by mass, 40% by mass, 38% by mass, 35% by mass, 33% by mass, and 30% by mass.

Furthermore, the compound represented by general formula (L-1-2) is preferably selected from compounds represented by formulas (L-1-2.1) to (L-1-2.4), and more preferably selected from compounds represented by formula (L- 1－2.2)~(L－1－2.4) The compound represented.

In particular, the compound represented by the formula (L-1-2.2) is particularly preferable because it can improve the response speed of the liquid crystal composition. Moreover, when a higher Tni is required than the response speed, it is preferable to use the compound represented by the formula (L-1-2.3) or the formula (L-1-2.4). Furthermore, in order to improve the solubility at low temperatures, the total amount of the compound represented by the formula (L-1-2.3) and the compound represented by the formula (L-1-2.4) contained in the liquid crystal composition is set to 30 Mass% or more is not good.

The amount of the compound represented by formula (L-1-2.2) contained in the liquid crystal composition is preferably as follows. That is, the preferred lower limit values are 10% by mass, 15% by mass, 18% by mass, 20% by mass, 23% by mass, 25% by mass, 27% by mass, 30% by mass, 33% by mass, 35% by mass, 38 Mass%, 40% by mass. On the other hand, the preferred upper limit values are 60% by mass, 55% by mass, 50% by mass, 45% by mass, 43% by mass, 40% by mass, 38% by mass, 35% by mass, 32% by mass, 30% by mass, 27% by mass, 25% by mass, and 22% by mass.

The total amount of the compound represented by the formula (L-1-1.3) and the compound represented by the formula (L-1-2.2) contained in the liquid crystal composition is preferably as follows. That is, the preferred lower limit values are 10% by mass, 15% by mass, 20% by mass, 25% by mass, 27% by mass, 30% by mass, 35% by mass, and 40% by mass. On the other hand, the preferred upper limit values are 60% by mass, 55% by mass, 50% by mass, 45% by mass, 43% by mass, 40% by mass, 38% by mass, 35% by mass, 32% by mass, 30% by mass, 27% by mass, 25% by mass, and 22% by mass.

The compound represented by general formula (L-1) is preferably selected from compounds represented by general formula (L-1-3).

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

Preferably, R ^L13 and R ^L14 are each independently a linear alkyl group with 1 to 5 carbon atoms, a linear chain alkoxy group with 1 to 4 carbon atoms, or a linear chain with 2 to carbon atoms. 5 of alkenyl.

The amount of the compound represented by formula (L-1-3) contained in the liquid crystal composition is preferably as follows. That is, the lower limit values are 1% by mass, 5% by mass, 10% by mass, 13% by mass, 15% by mass, 17% by mass, 20% by mass, 23% by mass, 25% by mass, and 30% by mass. On the other hand, the preferred upper limit values are 60% by mass, 55% by mass, 50% by mass, 45% by mass, 40% by mass, 37% by mass, 35% by mass, 33% by mass, 30% by mass, 27% by mass, 25% by mass, 23% by mass, 20% by mass, 17% by mass, 15% by mass, 13% by mass, and 10% by mass.

Furthermore, the compound represented by general formula (L-1-3) is preferably selected from compounds represented by formulas (L-1-3.1) to (L-1-3.13), and more preferably selected from compounds represented by formula (L- 1-3.1), the compound represented by the formula (L-1-3.3) and the formula (L-1-3.4).

In particular, the compound represented by the formula (L-1-3.1) is particularly preferable because it can improve the response speed of the liquid crystal composition. In addition, when higher Tni is required than the response speed, it is better to use the formula (L-1－3.3), formula (L-1－3.4), formula (L-1－3.11) or formula (L-1 －3.12) The compound indicated. Furthermore, in order to improve the solubility at low temperatures, the compound represented by the formula (L-1-3.3), the compound represented by the formula (L-1-3.4), and the compound represented by the formula (L-1) contained in the liquid crystal composition It is not preferable that the total amount of the compound represented by -3.11) and the compound represented by the formula (L-1-3.13) is 20% by mass or more.

The amount of the compound represented by formula (L-1-3.1) contained in the liquid crystal composition is preferably as follows. That is, the preferred lower limit values are 1% by mass, 2% by mass, 3% by mass, 5% by mass, 7% by mass, 10% by mass, 13% by mass, 15% by mass, 18% by mass, and 20% by mass. On the other hand, the preferred upper limit values are 20% by mass, 17% by mass, 15% by mass, 13% by mass, 10% by mass, 8% by mass, 7% by mass, and 6% by mass.

The compound represented by general formula (L-1) is preferably selected from compounds represented by general formula (L1-4) 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 or an alkoxy group having 1 to 8 carbon atoms.

Preferably, R ^L15 and R ^L16 are each independently a linear alkyl group with 1 to 5 carbon atoms, a linear chain alkoxy group with 1 to 4 carbon atoms, or a linear chain with 2 to carbon atoms. 5 of alkenyl.

The amount of the compound represented by formula (L-1-4) contained in the liquid crystal composition is preferably as follows. That is, the preferred lower limit values are 1% by mass, 5% by mass, 10% by mass, 13% by mass, 15% by mass, 17% by mass, and 20% by mass. On the other hand, the preferable upper limit values are 25% by mass, 23% by mass, 20% by mass, 17% by mass, 15% by mass, 13% by mass, and 10% by mass.

The amount of the compound represented by formula (L-1-5) contained in the liquid crystal composition is preferably as follows. That is, the preferred lower limit values are 1% by mass, 5% by mass, 10% by mass, 13% by mass, 15% by mass, 17% by mass, and 20% by mass. On the other hand, the preferable upper limit values are 25% by mass, 23% by mass, 20% by mass, 17% by mass, 15% by mass, 13% by mass, and 10% by mass.

Furthermore, the compounds represented by the general formulas (L-1-4) and (L-1-5) are preferably selected from the compounds represented by the formulas (L-1-4.1) to (L-1-5.3), and more Preferably, it is selected from the compound represented by formula (L-1-4.2) and formula (L-1-5.2).

The amount of the compound represented by formula (L-1-4.2) contained in the liquid crystal composition is preferably as follows. That is, the preferred lower limit values are 1% by mass, 2% by mass, 3% by mass, 5% by mass, 7% by mass, 10% by mass, 13% by mass, 15% by mass, 18% by mass, and 20% by mass. On the other hand, the preferred upper limit values are 20% by mass, 17% by mass, 15% by mass, 13% by mass, 10% by mass, 8% by mass, 7% by mass, and 6% by mass.

Combined use is selected from 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), formula ( Two or more of the compounds represented by L-1—3.11) and formula (L-1—3.12), or a combination selected from formula (L-1—1.3), formula (L-1—2.2), and formula ( Two or more of the compounds represented by L-1—3.1), formula (L-1—3.3), formula (L-1—3.4) and formula (L-1—4.2) are also preferable.

The total amount of these compounds contained in the liquid crystal composition is preferably as follows. That is, the preferred lower limit values are 1% by mass, 2% by mass, 3% by mass, 5% by mass, 7% by mass, 10% by mass, 13% by mass, 15% by mass, 18% by mass, 20% by mass, 23 Mass%, 25% by mass, 27% by mass, 30% by mass, 33% by mass, and 35% by mass. On the other hand, the preferred upper limit values are 80% by mass, 70% by mass, 60% by mass, 50% by mass, 45% by mass, 40% by mass, 37% by mass, 35% by mass, 33% by mass, 30% by mass, 28% by mass, 25% by mass, 23% by mass, and 20% by mass.

When the reliability of the liquid crystal composition is important, it is preferable to use a compound selected from among the compounds represented by the formula (L-1-3.1), the formula (L-1-3.3) and the formula (L-1-3.4) in combination Two or more types, when the response speed of the liquid crystal composition is important, it is preferable to use two or more types selected from the compounds represented by the formula (L-1-1.3) and the formula (L-1-2.2) in combination.

The compound represented by the general formula (L-1) is preferably selected from compounds represented by the general formula (L-1-6).

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

The amount of the compound represented by formula (L-1-6) contained in the liquid crystal composition is preferably as follows. That is, the preferred lower limit values are 1% by mass, 5% by mass, 10% by mass, 15% by mass, 17% by mass, 20% by mass, 23% by mass, 25% by mass, 27% by mass, 30% by mass, 35 quality%. On the other hand, the preferable upper limit values are 60% by mass, 55% by mass, 50% by mass, 45% by mass, 42% by mass, 40% by mass, 38% by mass, 35% by mass, 33% by mass, and 30% by mass.

Furthermore, it is preferable that the compound represented by general formula (L-1-6) is selected from the compound represented by formula (L-1-6.1)-(L-1-6.3).

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

In the formula, R ^L21 and R ^L22 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.

R ^{L22 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.

The compound represented by the general formula (L-2) may be used alone or in combination of two or more.

The type of compound that can be used in combination is not particularly limited, and is appropriately selected according to the required properties such as solubility at low temperature, transition temperature, electrical reliability, and birefringence.

The types of compounds used are, for example, 1, 2, 3, 4, 5 or more in one embodiment of the present invention.

Regarding the amount of the compound represented by the general formula (L-2) contained in the liquid crystal composition, when the solubility at low temperature is important, the effect is higher if it is set more, and on the contrary, when the response speed is important When setting less, the effect is higher. Furthermore, in the case of improving drip marks or residual image characteristics, it is preferable to set the range of the amount to the middle.

The preferred lower limit values are 1% by mass, 2% by mass, 3% by mass, 5% by mass, 7% by mass, and 10% by mass. On the other hand, the preferred upper limit values are 20% by mass, 15% by mass, 13% by mass, 10% by mass, 8% by mass, 7% by mass, 6% by mass, 5% by mass, and 3% by mass.

Furthermore, the compound represented by general formula (L-2) is preferably selected from compounds represented by formulas (L-2.1) to (L-2.6), more preferably selected from formula (L-2.1), formula (L -2.3), the compound represented by formula (L-2.4) and formula (L-2.6).

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

In the formula, R ^L31 and R ^L32 independently represent the same meaning as R ^L1 and R ^L2 in the general formula (L).

Preferably, R ^L31 and R ^L32 are each independently an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

The compounds represented by the general formula (L-3) may be used alone or in combination of two or more.

The type of compound that can be used in combination is not particularly limited, and is appropriately selected according to the required properties such as solubility at low temperature, transition temperature, electrical reliability, and birefringence.

The types of compounds used are, for example, 1, 2, 3, 4, 5 or more in one embodiment of the present invention.

The amount of the compound represented by formula (L-3) contained in the liquid crystal composition is preferably as follows. That is, the preferred lower limit values are 1% by mass, 2% by mass, 3% by mass, 5% by mass, 7% by mass, and 10% by mass. On the other hand, the preferred upper limit values are 20% by mass, 15% by mass, 13% by mass, 10% by mass, 8% by mass, 7% by mass, 6% by mass, 5% by mass, and 3% by mass.

Regarding the amount of the compound represented by the general formula (L-3) contained in the liquid crystal composition, when a high birefringence is obtained, the effect is high if it is set more, and on the contrary, when a high Tni is important , The effect is higher if the setting is less. Furthermore, in the case of improving drip marks or residual image characteristics, it is preferable to set the range of the amount to the middle.

Furthermore, the compound represented by general formula (L-3) is preferably selected from compounds represented by formulas (L-3.1) to (L-3.7), more preferably selected from formulas (L-3.2) to (L- 3.5) The compound indicated.

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

In the formula, R ^L41 and R ^L42 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.

R ^{L42 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.

The compounds represented by the general formula (L-4) may be used alone or in combination of two or more.

The type of compound that can be used in combination is not particularly limited, and is appropriately selected according to the required properties such as solubility at low temperature, transition temperature, electrical reliability, and birefringence.

The types of compounds used are, for example, 1, 2, 3, 4, 5 or more in one embodiment of the present invention.

The amount of the compound represented by the general formula (L-4) contained in the liquid crystal composition can be based on solubility at low temperature, transition temperature, electrical reliability, birefringence, process adaptability, drip marks, and residual image , Dielectric conductivity and other required performance and adjust appropriately.

The preferred lower limit values are 1 mass%, 2 mass%, 3 mass%, 5 mass%, 7 mass%, 10 mass%, 14 mass%, 16 mass%, 20 mass%, 23 mass%, 26 mass%, 30% by mass, 35% by mass, and 40% by mass. On the other hand, the preferred upper limit values are 50% by mass, 40% by mass, 35% by mass, 30% by mass, 20% by mass, 15% by mass, 10% by mass, and 5% by mass.

Furthermore, the compound represented by general formula (L-4) is preferably selected from compounds represented by formulas (L-4.1) to (L-4.3).

According to the required properties such as solubility at low temperature, transition temperature, electrical reliability, birefringence, etc., the liquid crystal composition may contain the compound represented by the formula (L-4.1) and the compound represented by the formula (L-4.2) The compound may contain both the compound represented by formula (L-4.1) and the compound represented by formula (L-4.2), or may contain all the compounds represented by formula (L-4.1) to (L-4.3).

The amount of the compound represented by formula (L-4.1) or formula (L-4.2) contained in the liquid crystal composition is preferably as follows. That is, the preferred lower limit values are 3% by mass, 5% by mass, 7% by mass, 9% by mass, 11% by mass, 12% by mass, 13% by mass, 18% by mass, and 21% by mass. On the other hand, the preferred upper limit values are 45% by mass, 40% by mass, 35% by mass, 30% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass, 15% by mass, 13% by mass, 10% by mass, 8% by mass.

When the liquid crystal composition contains both the compound represented by formula (L-4.1) and the compound represented by formula (L-4.2), the total amount contained in the liquid crystal composition is preferably as follows. That is, the preferred lower limit values are 15% by mass, 19% by mass, 24% by mass, and 30% by mass. On the other hand, the preferable upper limit values are 45% by mass, 40% by mass, 35% by mass, 30% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass, 15% by mass, and 13% by mass.

In addition, the compound represented by general formula (L-4) is preferably selected from compounds represented by formulas (L-4.4) to (L-4.6), and more preferably selected from compounds represented by formula (L-4.4) .

According to the required properties such as solubility at low temperature, transition temperature, electrical reliability, birefringence, etc., the liquid crystal composition may contain the compound represented by the formula (L-4.4) and the compound represented by the formula (L-4.5) The compound may also contain both the compound represented by formula (L-4.4) and the compound represented by formula (L-4.5).

The amount of the compound represented by formula (L-4.4) or formula (L-4.5) in the liquid crystal composition is preferably as follows. That is, the preferred lower limit values are 3% by mass, 5% by mass, 7% by mass, 9% by mass, 11% by mass, 12% by mass, 13% by mass, 18% by mass, and 21% by mass. On the other hand, the preferred upper limit values are 45% by mass, 40% by mass, 35% by mass, 30% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass, 15% by mass, 13% by mass, 10% by mass, 8% by mass.

When the liquid crystal composition contains both the compound represented by formula (L-4.4) and the compound represented by formula (L-4.5), the total amount contained in the liquid crystal composition is preferably as follows. That is, the preferred lower limit values are 15% by mass, 19% by mass, 24% by mass, and 30% by mass. On the other hand, the preferable upper limit values are 45% by mass, 40% by mass, 35% by mass, 30% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass, 15% by mass, and 13% by mass.

Moreover, the compound represented by general formula (L-4) is preferably selected from compounds represented by formulas (L-4.7) to (L-4.10), and particularly preferably a compound represented by formula (L-4.9).

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

In the formula, R ^L51 and R ^L52 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.

R ^{L52 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.

The compounds represented by the general formula (L-5) may be used alone or in combination of two or more.

The type of compound that can be used in combination is not particularly limited, and is appropriately selected according to the required properties such as solubility at low temperature, transition temperature, electrical reliability, and birefringence.

The types of compounds used are, for example, 1, 2, 3, 4, 5 or more in one embodiment of the present invention.

The amount of the compound represented by the general formula (L-5) contained in the liquid crystal composition can be based on solubility at low temperature, transition temperature, electrical reliability, birefringence, process adaptability, drip marks, residual image, media The required performance such as electrical conductivity etc. is adjusted appropriately.

The preferred lower limit values are 1 mass%, 2 mass%, 3 mass%, 5 mass%, 7 mass%, 10 mass%, 14 mass%, 16 mass%, 20 mass%, 23 mass%, 26 mass%, 30% by mass, 35% by mass, and 40% by mass. On the other hand, the preferred upper limit values are 50% by mass, 40% by mass, 35% by mass, 30% by mass, 20% by mass, 15% by mass, 10% by mass, and 5% by mass.

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

The amount of each compound contained in the liquid crystal composition is preferably as follows. That is, the preferable lower limit values are 1% by mass, 2% by mass, 3% by mass, 5% by mass, and 7% by mass. On the other hand, the preferable upper limit values are 20% by mass, 15% by mass, 13% by mass, 10% by mass, and 9% by mass.

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

The amount of each compound contained in the liquid crystal composition is preferably as follows. That is, the preferable lower limit values are 1% by mass, 2% by mass, 3% by mass, 5% by mass, and 7% by mass. On the other hand, the preferable upper limit values are 20% by mass, 15% by mass, 13% by mass, 10% by mass, and 9% by mass.

In addition, the compound represented by general formula (L-5) is preferably selected from compounds represented by formulas (L-5.5) to (L-5.7), and is particularly preferably a compound represented by formula (L-5.7).

The amount of each compound contained in the liquid crystal composition is preferably as follows. That is, the preferable lower limit values are 1% by mass, 2% by mass, 3% by mass, 5% by mass, and 7% by mass. On the other hand, the preferable upper limit values are 20% by mass, 15% by mass, 13% by mass, 10% by mass, and 9% by mass.

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

In the formula, R ^L61 and R ^L62 respectively independently represent the same meaning as R ^L1 and R ^L2 in general formula (L).

X ^L61 and X ^L62 each independently represent a hydrogen atom or a fluorine atom.

Preferably, R ^L61 and R ^L62 are each independently an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms.

Preferably, one of X ^L61 and X ^L62 is a fluorine atom, and the other is a hydrogen atom.

The compound represented by the general formula (L-6) may be used alone or in combination of two or more.

The type of compound that can be used in combination is not particularly limited, and is appropriately selected according to the required properties such as solubility at low temperature, transition temperature, electrical reliability, and birefringence.

The types of compounds used are, for example, 1, 2, 3, 4, 5 or more in one embodiment of the present invention.

The amount of the compound represented by general formula (L-6) contained in the liquid crystal composition is preferably as follows. That is, the preferred lower limit values are 1% by mass, 2% by mass, 3% by mass, 5% by mass, 7% by mass, 10% by mass, 14% by mass, 16% by mass, 20% by mass, 23% by mass, 26 Mass%, 30 mass%, 35 mass%, 40 mass%. On the other hand, the preferred upper limit values are 50% by mass, 40% by mass, 35% by mass, 30% by mass, 20% by mass, 15% by mass, 10% by mass, and 5% by mass. Furthermore, the amount of the compound represented by the general formula (L-6) is better when the emphasis is placed on increasing Δn, and when the emphasis is placed on precipitation at low temperature, it is better to be smaller.

Furthermore, the compound represented by general formula (L-6) is preferably selected from compounds represented by formulas (L-6.1) to (L-6.9).

The types of compounds that can be used in combination are not particularly limited, and it is preferable to select 1 to 3 types from the compounds represented by formulas (L-6.1) to (L-6.9), more preferably 1 to 4 types.

In addition, the compound used in combination has a wide molecular weight distribution and is also effective for solubility. For example, it is preferable to select one of the compounds represented by formula (L-6.1) and formula (L-6.2), formula (L-6.4 ) And one of the compounds represented by formula (L-6.5), one of the compounds represented by formula (L-6.6) and formula (L-6.7), and one of the compounds represented by formula (L-6.8) and formula (L-6.8) -6.9) One of the compounds indicated, and appropriate combination of these.

Among them, it is preferable to contain a compound represented by formula (L-6.1), formula (L-6.3), formula (L-6.4), formula (L-6.6), and formula (L-6.9).

Moreover, the compound represented by general formula (L-6) is preferably selected from compounds represented by formulas (L-6.10) to (L-6.17), and is preferably a compound represented by formula (L-6.11).

The amount of each compound contained in the liquid crystal composition is preferably as follows. That is, the preferable lower limit values are 1% by mass, 2% by mass, 3% by mass, 5% by mass, and 7% by mass. On the other hand, the preferable upper limit values of the content are 20% by mass, 15% by mass, 13% by mass, 10% by mass, and 9% by mass.

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

In the formula, R ^L71 and R ^L72 respectively independently represent the same meaning as R ^L1 and R ^L2 in the general formula (L).

A ^L71 and A ^L72 respectively independently represent the same meaning as A ^L2 and A ^L3 in the general formula (L), but the hydrogen atoms present in A ^L71 and A ^L72 may be independently substituted by fluorine atoms.

Z ^L71 means the same meaning as Z ^L2 in general 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} preferably 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.

Preferably, A ^L71 and A ^L72 are each independently 1,4-cyclohexylene or 1,4-phenylene. Furthermore, the hydrogen atoms present in A ^L71 and A ^L7 may be independently substituted by fluorine atoms.

Z ^{L71 is} preferably a single bond or COO-, more preferably a single bond.

X ^L71 and X ^{L72 are} preferably hydrogen atoms.

The type of compound that can be used in combination is not particularly limited, and is appropriately selected according to the required properties such as solubility at low temperature, transition temperature, electrical reliability, and birefringence.

The types of compounds used are, for example, one, two, three, or four in one embodiment of the present invention.

The amount of the compound represented by the general formula (L-7) contained in the liquid crystal composition can be based on solubility at low temperature, transition temperature, electrical reliability, birefringence, process adaptability, drip marks, residual image, medium The required performance such as electrical conductivity etc. is adjusted appropriately.

The preferred lower limit values are 1% by mass, 2% by mass, 3% by mass, 5% by mass, 7% by mass, 10% by mass, 14% by mass, 16% by mass, and 20% by mass. On the other hand, the preferred upper limit values are 30% by mass, 25% by mass, 23% by mass, 20% by mass, 18% by mass, 15% by mass, 10% by mass, and 5% by mass.

Furthermore, with regard to the amount of the compound represented by the general formula (L-7), when a liquid crystal composition with a high Tni is required, it is better to set a larger amount, and when a liquid crystal composition with a low viscosity is required, set Less is better.

Furthermore, the compound represented by general formula (L-7) is preferably selected from compounds represented by formulas (L-7.1) to (L-7.4), and more preferably a compound represented by formula (L-7.2).

Moreover, the compound represented by general formula (L-7) is preferably selected from compounds represented by formulas (L-7.11) to (L-7.13), and is preferably a compound represented by formula (L-7.11).

In addition, the compound represented by general formula (L-7) is preferably selected from compounds represented by formulas (L-7.21) to (L-7.23), and more preferably compounds represented by formula (L-7.21).

Furthermore, the compound represented by general formula (L-7) is preferably selected from compounds represented by formulas (L-7.31) to (L-7.34), more preferably formula (L-7.31) and/or formula (L-7.31) －7.32) The compound indicated.

In addition, the compound represented by the general formula (L-7) is preferably selected from compounds represented by the formulas (L-7.41) to (L-7.44), more preferably the formula (L-7.41) and/or the formula (L-7.41) －7.42) The compound indicated.

Moreover, the compound represented by general formula (L-7) is preferably selected from compounds represented by formulas (L-7.51) to (L-7.53).

The above-mentioned 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.

Furthermore, when the reliability and long-term stability of the liquid crystal composition are important, the amount of the compound having a carbonyl group contained in the liquid crystal composition is preferably 5% by mass or less, more preferably 3% by mass Hereinafter, it is more preferably set to 1% by mass or less, and particularly preferably set to be substantially 0% by mass.

When the stability by UV irradiation is important, the amount of the compound substituted by the chlorine atom in the liquid crystal composition is preferably 15% by mass or less, more preferably 10% by mass or less, and even more preferably 8% by mass or less, more preferably 5% by mass or less, particularly preferably 3% by mass or less, and most preferably substantially 0% by mass.

In addition, it is preferable that the compound in which the ring structure in the molecule is all 6-membered rings is contained in a larger amount in the liquid crystal composition. Specifically, it is preferably 80% by mass or more, more preferably 90% by mass or more , More preferably 95% by mass or more, and most preferably substantially 100% by mass.

In order to prevent or suppress the degradation caused by the oxidation of the liquid crystal composition, it is preferable that the amount of the compound having a cyclohexene ring as a ring structure contained in the liquid crystal composition is small, and specifically, it is preferably 10 Mass% or less, more preferably 8 mass% or less, still more preferably 5 mass% or less, particularly preferably 3 mass% or less, and most preferably substantially 0 mass%.

Further, in order to prevent or suppress degradation caused by oxidation of the liquid crystal composition, it is preferable that the amount of the compound having -CH=CH- as the linking group contained in the liquid crystal composition is small, and specifically, it is preferable It is 10% by mass or less, more preferably 5% by mass or less, and still more preferably substantially 0% by mass.

When paying attention to improving the viscosity (η) of the liquid crystal composition and improving the nematic-isotropic liquid phase transition temperature (Tni), it is preferable to have a hydrogen atom in the molecule that can be substituted with a halogen atom. The amount of the benzene-1,4-diyl compound contained in the liquid crystal composition is relatively small. Specifically, it is preferably 10% by mass or less, more preferably 5% by mass or less, and still more preferably It is substantially 0% by mass.

When the compound (liquid crystal molecule, etc.) contained in the liquid crystal composition has an alkenyl group-bonded cyclohexylene group as a side chain, the number of carbon atoms of the alkenyl group is preferably 2-5. In addition, when the compound contained in the liquid crystal composition has a phenylene group bonded with an alkenyl group as a side chain, the number of carbon atoms of the alkenyl group is preferably 4 to 5, and the alkenyl group is preferred. Unsaturated bonds and phenylene are not directly bonded.

In addition, when the stability of the liquid crystal composition is important, it is preferred that a compound having an alkenyl group as a side chain and a 2,3-difluorobenzene-1,4-diyl group be contained in the liquid crystal composition The amount is small, and specifically, it is preferably 10% by mass or less, more preferably 5% by mass or less, and still more preferably substantially 0% by mass.

The average elastic constant (K _AVG ) of the liquid crystal composition is preferably 10-25. Among them, the preferred lower limit values are 10, 10.5, 11, 11.5, 12, 12.3, 12.5, 12.8, 13, 13.3, 13.5, 13.8, 14, 14.3, 14.5, 14.8, 15, 15.3, 15.5, 15.8, 16, 16.3, 16.5, 16.8, 17, 17.3, 17.5, 17.8, 18. On the other hand, its preferred upper limit is 25, 24.5, 24, 23.5, 23, 22.8, 22.5, 22.3, 22, 21.8, 21.5, 21.3, 21, 20.8, 20.5, 20.3, 20, 19.8, 19.5, 19.3, 19, 18.8, 18.5, 18.3, 18, 17.8, 17.5, 17.3, 17.

When focusing on reducing power consumption, it is effective to suppress the amount of light from the backlight. Therefore, it is preferable to increase the light transmittance of the liquid crystal display element 1. Therefore, it is preferable to set the value of K _{AVG to} be low. When it is important to improve the response speed, it is better to set the value of K _{AVG to} be higher.

The refractive index anisotropy (Δn) (hereinafter, also referred to simply as "refractive index anisotropy") of the liquid crystal composition at 25°C is preferably about 0.08 to 0.13, more preferably about 0.09 to 0.12.

The rotational viscosity (γ1) of the liquid crystal composition at 25°C (hereinafter, also referred to as "rotational viscosity") is preferably less than 165mPa･s, more preferably about 80～145mPa･s, and still more preferably 90～130mPa ･S around. By using the liquid crystal composition having the rotational viscosity, the response speed of the liquid crystal layer 4 (liquid crystal display element 1) can be prevented from decreasing.

Furthermore, in the liquid crystal composition, it is preferable that in the liquid crystal composition of the present invention, Z, which is a coefficient of the value of rotational viscosity and refractive index anisotropy, represents a specific value.

In the formula, γ1 represents rotational viscosity, and Δn represents refractive index anisotropy.

Z is preferably 13,000 mPa･s or less, more preferably 12,000 mPa･s or less, and still more preferably 11,000 mPa･s or less.

The nematic-isotropic liquid phase transition temperature (Tni) of the liquid crystal composition is preferably 60°C or higher, more preferably 75°C or higher, and still more preferably 80°C or higher. By using the liquid crystal composition having the Tni, the liquid crystal layer 4 (liquid crystal display element 1) that can be stably driven in the actual temperature range can be obtained.

The specific resistance of the liquid crystal composition is preferably 10 ¹² Ω･m or more, more preferably 10 ¹³ Ω･m or more, and still more preferably 10 ¹⁴ Ω･m or more.

The absolute value of the dielectric anisotropy (Δε) of the liquid crystal composition at 25°C is preferably about 2.5-5, more preferably about 2.6-4.5, still more preferably about 2.7-4, still more preferably 2.8- Around 3.5. By using a liquid crystal composition having this dielectric anisotropy, it becomes possible to drive the liquid crystal layer 4 (liquid crystal display element 1) with a lower voltage.

Furthermore, the liquid crystal composition described above may contain other compounds (molecules) such as normal nematic liquid crystals, smectic liquid crystals, cholesteric liquid crystals, antioxidants, ultraviolet absorbers, etc., depending on the application. .

Among them, when the chemical stability of the liquid crystal composition is required, other compounds preferably do not have a chlorine atom in their structure. In addition, when stability of the liquid crystal composition to light such as ultraviolet light is required, other compounds preferably do not have a condensed ring with a long conjugation length represented by a naphthalene ring and the like and an absorption peak in the ultraviolet region. .

(Liquid crystal display element) Next, a liquid crystal display element including a liquid crystal layer formed of the above liquid crystal composition will be described.

FIG. 1 is an exploded perspective view schematically showing an embodiment of a liquid crystal display element, and FIG. 2 is an enlarged plan view of the area enclosed by the line I in FIG. 1.

Furthermore, in FIGS. 1 and 2, for the convenience of description, there are cases where the size of each part and the ratio thereof are exaggerated and different from the actual situation. In addition, the materials, dimensions, etc. shown below are just an example, and the present invention is not limited to them, and can be appropriately changed without departing from the gist.

The liquid crystal display element 1 shown in FIG. 1 includes an active matrix substrate AM and a color filter substrate CF arranged in an opposing manner, and a liquid crystal layer 4 sandwiched between the active matrix substrate AM and the color filter substrate CF.

The active matrix substrate AM has a first substrate 2, a pixel electrode layer 5 provided on the surface of the first substrate 2 on the liquid crystal layer 4 side, and a first polarizing plate provided on the surface of the first substrate 2 opposite to the liquid crystal layer 4 7.

On the other hand, the color filter substrate CF has a second substrate 3, a common electrode layer 6 provided on the liquid crystal layer 4 side of the second substrate 3, and a second substrate 3 provided on the surface opposite to the liquid crystal layer 4 The polarizing plate 8 and the color filter 9 provided between the second substrate 3 and the common electrode layer 6.

That is, the liquid crystal display element 1 of this embodiment has a first polarizer 7, a first substrate 2, a pixel electrode layer 5, a liquid crystal layer 4, a common electrode layer 6, a color filter 9, a second substrate 3, and a second polarizer. The plates 8 are laminated in sequence.

The first substrate 2 and the second substrate 3 are respectively formed of a flexible (flexible) material such as a glass material or a plastic material.

Both the first substrate 2 and the second substrate 3 may have light transmittance, or only one of them may have light transmittance. In the latter case, the other substrate can be made of an opaque material such as a metal material or a silicon material.

As shown in FIG. 2, the pixel electrode layer 5 has a plurality of gate bus lines 11 for supplying scanning signals, a plurality of data bus lines 12 for supplying display signals, and a plurality of pixel electrodes 13. Furthermore, a pair of gate bus lines 11 and 11 and a pair of data bus lines 12 and 12 are shown in FIG. 2.

A plurality of gate bus lines 11 and a plurality of data bus lines 12 are arranged in a matrix to cross each other, and the unit pixels of the liquid crystal display element 1 are formed by the enclosed areas. One pixel electrode 13 is formed in each unit pixel.

The pixel electrode 13 has a structure (a so-called fishbone structure) having two stem portions orthogonal to each other to form a cross shape, and a plurality of branches branching from each stem portion and extending toward the outside.

Between the pair of gate bus lines 11 and 11, a Cs electrode 14 is provided substantially parallel to the gate bus line 11. In addition, a thin film transistor including a source electrode 15 and a drain electrode 16 is provided near the intersection where the gate bus line 11 and the data bus line 12 cross each other. The drain electrode 16 is provided with a contact hole 17.

The gate bus line 11 and the data bus line 12 are preferably formed of, for example, Al, Cu, Au, Ag, Cr, Ta, Ti, Mo, W, Ni, or alloys containing them, and more preferably, Mo , Al or alloys containing them.

In order to increase the light transmittance, the pixel electrode 13 is composed of, for example, a transparent electrode. The transparent electrode is sputtered by compounds such as ZnO, InGaZnO, SiGe, GaAs, IZO (Indium Zinc Oxide), ITO (Indium Tin Oxide), SnO, TiO, AZTO (AlZnSnO), etc. Formed by plating, etc.

The average thickness of the transparent electrode is preferably about 10 to 200 nm. In addition, in order to reduce resistance, a transparent electrode can be formed in the form of a polycrystalline ITO film by firing an amorphous ITO film.

On the other hand, the common electrode layer 6 has, for example, a plurality of striped common electrodes (transparent electrodes) arranged together. The common electrode may be formed in the same manner as the pixel electrode 13.

The color filter 9 can be produced by, for example, a pigment dispersion method, a printing method, an electrodeposition method, or a dyeing method.

In the pigment dispersion method, the curable coloring composition for color filters is supplied onto the second substrate 3 in a specific pattern, and then cured by heating or light irradiation. This operation is performed for the three colors of red, green, and blue, whereby the color filter 9 can be obtained.

Furthermore, the color filter 9 may be arranged on the side of the first substrate 2.

In addition, from the viewpoint of preventing light leakage, the liquid crystal display element 1 may be provided with a black matrix (not shown). The black matrix is preferably formed in a portion corresponding to the thin film transistor.

Furthermore, the black matrix can be arranged on the second substrate 3 side together with the color filter 9, or on the first substrate 2 side together with the color filter 9, or the black matrix can be separately arranged on the first substrate 2 side. On the substrate 2 side, the color filter 9 is arranged on the second substrate 3 side. In addition, the black matrix may be formed by overlapping the colors of the color filter 9 to reduce the transmittance.

The active matrix substrate AM and the color filter substrate CF are bonded to each other in the peripheral area thereof by a sealing material (sealing material) composed of an epoxy-based thermosetting composition or the like.

Furthermore, spacers that maintain the same distance between the active matrix substrate AM and the color filter substrate CF may also be arranged. Examples of the spacer include granular spacers such as glass particles, plastic particles, and alumina particles, and resin spacers formed by photolithography.

The average separation distance between the active matrix substrate AM and the color filter substrate CF (ie, the average thickness of the liquid crystal layer 4) is preferably about 1-100 μm.

The first polarizing plate 7 and the second polarizing plate 8 can be designed in such a way that the viewing angle or the contrast becomes good by adjusting the positional relationship of their transmission axes. Specifically, the first polarizing plate 7 and the second polarizing plate 8 are preferably arranged such that their transmission axes operate in a normally black mode and are orthogonal to each other. It is particularly preferable that any one of the first polarizing plate 7 and the second polarizing plate 8 is arranged such that its penetration axis is parallel to the alignment direction of the liquid crystal molecules when no voltage is applied.

In addition, when the first polarizing plate 7 and the second polarizing plate 8 are used, it is preferable to adjust the refractive index anisotropy (∆n) of the liquid crystal layer 4 and the average thickness of the liquid crystal layer 4 so that the contrast becomes maximum. product. Furthermore, the liquid crystal display element 1 may be equipped with the retardation film for expanding the viewing angle.

Furthermore, in the liquid crystal display element 1, an alignment film such as a polyimide alignment film may be provided on the liquid crystal layer 4 side of at least one of the active matrix substrate AM and the color filter substrate CF in contact with the liquid crystal layer 4 membrane.

(Method of manufacturing liquid crystal display element) Next, a method of manufacturing such a liquid crystal display element 1 will be described.

The manufacturing method of the liquid crystal display element of this embodiment has: a preparation step [1], which prepares a substrate and a liquid crystal composition; an assembly step [2], which assembles the liquid crystal display element 1; and a polymerization step [3], which polymerizes The monomers A and B are polymerized; and the hardening step [4], which hardens the sealing material.

[1] Preparation steps First, the active matrix substrate AM, the color filter substrate CF, and the above-mentioned liquid crystal composition are prepared.

[2] Assembly steps Then, along the edge of at least one of the active matrix substrate AM and the color filter substrate CF, a dispenser is used to draw the sealing material into a closed-loop bank shape.

After that, a specific amount of the liquid crystal composition is dropped into the inner side of the sealing material, and the active matrix substrate AM and the color filter substrate CF are arranged to face each other so as to be in contact with the liquid crystal composition under reduced pressure.

In this drop filling (ODF: One Drop Fill) method, the optimum filling amount must be dropped according to the size of the liquid crystal display element 1. The above-mentioned liquid crystal composition, for example, the rapid pressure change in the dripping device generated during dripping or the impact on impact is less, and the dripping can be continued stably for a long time. Therefore, the yield of the liquid crystal display element 1 can be maintained high.

In particular, small liquid crystal display elements often used in smart phones have a small optimal injection amount of liquid crystal composition, so it is difficult to control the deviation amount within a certain range. However, by using the above-mentioned liquid crystal composition, even in a small liquid crystal display element, a stable and optimal injection amount can be accurately dropped.

In addition, the ODF method can suppress the occurrence of drip marks when the liquid crystal composition is dropped onto the substrate. Furthermore, the so-called dripping mark refers to the phenomenon that the traces of the liquid crystal composition dripped appear white when the display is black.

[3] Polymerization step Next, the liquid crystal composition is irradiated with active energy rays such as ultraviolet rays and electron beams to polymerize the polymerizable monomers A and B.

Thereby, a polymer layer for controlling the alignment of the liquid crystal is formed on the interface of the liquid crystal layer 4 to obtain the liquid crystal display element 1.

In order to give a sufficient pretilt angle to the liquid crystal molecules, a moderate polymerization speed is desirable. Therefore, during polymerization, it is preferable to irradiate active energy rays singly, in combination, or sequentially. When using ultraviolet light, either a polarized light source or a non-polarized light source can be used.

Furthermore, when polymerizing two substrates facing each other in contact with the liquid crystal composition as in this embodiment, at least the substrate on the side of the irradiation surface must have a proper penetration of active energy rays Sex.

In addition, the polymerization can be carried out in several stages as described below. Specifically, the electric field, magnetic field, or temperature are adjusted to change the alignment state of the liquid crystal molecules. In this state, the liquid crystal composition is irradiated with active energy rays to polymerize the polymerizable monomer A and the polymerizable monomer B. Then, without applying an electric field or a magnetic field, the liquid crystal composition is irradiated with active energy rays to polymerize the remaining polymerizable monomer A and polymerizable monomer B.

Especially when ultraviolet rays are used, it is preferable to apply an AC electric field to the liquid crystal composition while irradiating ultraviolet rays.

The frequency of the AC applied is preferably about 10 Hz to 10 kHz, more preferably about 60 Hz to 10 kHz.

The applied AC voltage is selected depending on the desired pretilt angle of the liquid crystal display element 1. That is, by adjusting the applied AC voltage, the pretilt angle of the liquid crystal display element 1 can be controlled.

The temperature when irradiating ultraviolet rays is preferably within a temperature range that maintains the liquid crystal state of the liquid crystal composition. The specific temperature is preferably a temperature close to room temperature, that is, typically about 15 to 35°C.

As a lamp that generates ultraviolet rays, metal halide lamps, high-pressure mercury lamps, ultra-high pressure mercury lamps, fluorescent tubes, etc. can be used.

In addition, the ultraviolet rays to be irradiated are preferably ultraviolet rays having a wavelength that is not the absorption wavelength region of the liquid crystal composition, and it is more preferable to use a specific wavelength cut off as necessary.

The intensity of the irradiated ultraviolet rays is preferably about 0.1 mW/cm ² ˜100 W/cm ² , more preferably about 2 mW/cm ² ˜50 W/cm ² . Furthermore, it is also possible to irradiate ultraviolet rays while changing the intensity.

The energy of the irradiated ultraviolet rays can be adjusted appropriately, preferably about 10 mJ/cm ² ˜500 J/cm ² , more preferably about 100 mJ/cm ² ˜200 J/cm ² .

In addition, the time for irradiating ultraviolet rays is appropriately selected according to its intensity, and is preferably about 10 to 3600 seconds, and more preferably about 10 to 600 seconds.

Furthermore, in the assembly step [2], the vacuum injection method can also be used instead of the drop injection (ODF) method. For example, in the vacuum injection method, firstly, the sealing material is screen-printed along the edge of at least one of the active matrix substrate AM and the color filter substrate CF while leaving the injection port. After that, the sealing material is thermally cured by bonding and heating the two substrates AM and CF. Then, the liquid crystal composition is injected into the space partitioned by the sealing material between the two substrates AM and CF through the injection port under vacuum, and the injection port is sealed. Then, move to [3] polymerization step.

The liquid crystal display element 1 obtained in the above manner is preferably a PSA type, PSVA type, VA type, IPS type, FFS type or ECB type liquid crystal display element, and more preferably a PSA type liquid crystal display element.

Above, the liquid crystal composition and liquid crystal display element of the present invention have been described based on the illustrated embodiment, but the present invention is not limited to this, and each configuration can be replaced with any configuration having the same function, and other arbitrary configurations may be added. Example

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

The characteristics measured for the liquid crystal composition are as follows.

Tni: nematic phase-isotropic liquid phase transition temperature (℃) Δn: Refractive index anisotropy of 293 K Δε: Dielectric conductivity of 293 K γ1: Rotational viscosity of 293 K (mPa·s) K11: Elastic constant of diffusion of 293 K (pN) K33: Bending elastic constant of 293 K (pN)

1. Preparation of liquid crystal mixture Hereinafter, for the description of the compound, the following abbreviation is used. The n in the abbreviation is a natural number.

(Side chain) -n -C _n H _2n+1 : Linear alkyl group with n carbon atoms n- C _n H _2n+1 -: Linear alkyl group with n carbon atoms -On- -OC _n H _2n+1 ：Straight-chain alkoxy group with n carbon atoms

(Link structure)

(Ring structure)

The composition and physical properties of the liquid crystal mixture LC-1 are shown in Table 1 below.

[Table 1] LC-1 Liquid crystal molecules [mass%] 3-Cy-Cy-2 16.5 3-Cy-Cy-4 3 3-Cy-Ph-O1 15 3-Ph-Ph-1 9 3-Cy-Ph-Ph-2 8 3－Cy－1O－Ph5－O1 8.5 3－Cy－Cy－1O－Ph5－O2 17 2－Cy－Ph－Ph5－O2 6.5 3-Cy-Ph-Ph5-O2 8 3-Cy-Ph-Ph5-O4 8.5 total 100 Property value Tni[℃] 75 Δn 0.112 Δε -3.0 γ1[mPa·s] 122 K11[pN] 14.1 K33[pN] 13.9

2. Preparation of liquid crystal composition (Example 1) First, the following polymerizable monomer A and the following polymerizable monomer B1 are mixed so that the mass ratio becomes 75:25 to obtain a polymerizable monomer mixture.

Next, 0.3 parts by mass of the polymerizable monomer mixture was mixed with 100 parts by mass of the liquid crystal mixture LC-1, and the mixture was heated and dissolved, thereby obtaining a liquid crystal composition.

(Example 2) Except that the polymerizable monomer A and the polymerizable monomer B1 were mixed in a mass ratio of 50:50 to obtain a polymerizable monomer mixture, a liquid crystal composition was obtained in the same manner as in Example 1 above.

(Example 3) Except that the polymerizable monomer A and the polymerizable monomer B1 were mixed so that the mass ratio became 25:75 to obtain a polymerizable monomer mixture, a liquid crystal composition was obtained in the same manner as in Example 1 above.

(Examples 11-13) Except for using the following polymerizable monomer B2 instead of the polymerizable monomer B1, a liquid crystal composition was obtained in the same manner as in Examples 1 to 3 above.

(Examples 21-23) Except for using the following polymerizable monomer B3 instead of the polymerizable monomer B1, a liquid crystal composition was obtained in the same manner as in Examples 1 to 3 above.

(Comparative example 1) A liquid crystal composition was obtained in the same manner as in Example 1 above except that the polymerizable monomer A was used alone.

(Comparative example 2) A liquid crystal composition was obtained in the same manner as in Example 1 above except that the polymerizable monomer B1 was used alone.

(Comparative example 3) A liquid crystal composition was obtained in the same manner as in Example 1 above except that the polymerizable monomer B2 was used alone.

(Comparative Example 4) A liquid crystal composition was obtained in the same manner as in Example 1 above except that the polymerizable monomer B3 was used alone.

3. Production of liquid crystal display elements First, after coating the polyimide film on the ITO substrate, the polyimide film is rubbed to form an alignment film. Then, an empty liquid crystal cell (cell gap 3.5 μm) containing an ITO substrate with an alignment film was produced.

Next, the liquid crystal composition of each example and each comparative example was injected into the empty liquid crystal cell by a vacuum injection method.

Next, under the condition that an AC electric field (AC voltage) with a frequency of 100 Hz and 10 V is applied, the liquid crystal cell injected with the liquid crystal composition is irradiated with a high-pressure mercury lamp with a high-pressure mercury lamp through a filter that cuts off ultraviolet rays with a wavelength below 325 nm.

At this time, set the illuminance measured under the condition of the center wavelength of 365nm to be 100mW/cm ² , and irradiate ultraviolet rays with a cumulative light amount of 10J/cm ² . Thereby, a pretilt angle is given to the liquid crystal molecules in the liquid crystal composition.

4. Evaluation The following evaluation was performed on the liquid crystal display element using the liquid crystal composition of each Example and each comparative example.

4-1. Evaluation of the effect of pretilt angle In the obtained liquid crystal display element, a pretilt angle measurement system (manufactured by SYMTEC, "OPTIPRO") was used to measure the pretilt angle of the liquid crystal molecules, and the evaluation was performed based on the following criteria.

[Evaluation criteria] A: More than 4° B: 2～4° C: Less than 2°

4-2. Evaluation of pretilt angle change Set the pretilt angle in the evaluation of "4-1" as the initial value.

Next, a rectangular voltage with a frequency of 100 Hz and 30 V was applied to the liquid crystal display element, and the backlight was continuously illuminated for 10 hours. Then, the pretilt angle was measured again and set as the pretilt angle (value after the test).

The measured pretilt angle (initial value) minus the pretilt angle (post-test value) is set as the pretilt angle change amount (= the absolute value of the pretilt angle change) [°], and the evaluation is based on the following criteria.

[Evaluation criteria] A: Change of less than 0.5° B: Change of 0.5～1° C: Change of more than 1° The closer the pretilt angle change amount is to 0[°], the lower the possibility of poor display caused by the pretilt angle change becomes.

The results of these evaluations are shown in Tables 2 to 4.

[Table 2] Polymerizable monomer A [mass%] Polymerizable monomer B1 [mass%] Pretilt Pretilt angle change Comparative example 1 100 0 C A Example 1 75 25 B A Example 2 50 50 A A Example 3 25 75 A B Comparative example 2 0 100 A C

[table 3] Polymerizable monomer A [mass%] Polymerizable monomer B2 [mass%] Pretilt Pretilt angle change Comparative example 1 100 0 C A Example 11 75 25 B A Example 12 50 50 A A Example 13 25 75 A B Comparative example 3 0 100 A C

[Table 4] Polymerizable monomer A [mass%] Polymerizable monomer B3 [mass%] Pretilt Pretilt angle change Comparative example 1 100 0 C A Example 21 75 25 B B Example 22 50 50 A B Example 23 25 75 A B Comparative example 4 0 100 A C

As shown in Tables 2 to 4, in each example, the effect of imparting the pretilt angle and the effect of reducing the amount of change thereof are excellent.

On the other hand, in each comparative example, either the effect of imparting the pretilt angle and the effect of reducing the amount of change are poor.

Furthermore, in this embodiment, although all polymerizable monomers are mixed with 0.3 parts by mass relative to 100 parts by mass of liquid crystal molecules, it is not limited to this, and can be in the range of 0.1 to 3 parts by mass (preferably It is 0.2-2 mass parts) to mix. As long as the usage amount is in this range, the same tendency effect as the above can be obtained.

1: liquid crystal display element AM: active matrix substrate CF: Color filter substrate 2: The first substrate 3: The second substrate 4: Liquid crystal layer 5: Pixel electrode layer 6: Common electrode layer 7: The first polarizer 8: The second polarizer 9: Color filter 11: Gate bus line 12: Data bus line 13: Pixel electrode 14: Cs electrode 15: Source electrode 16: Drain electrode 17: Contact hole

[Fig. 1] A diagram schematically showing an embodiment of a liquid crystal display element. [Figure 2] An enlarged top view of the area enclosed by line I in Figure 1.

1: liquid crystal display element

AM: active matrix substrate

CF: Color filter substrate

2: The first substrate

3: The second substrate

4: Liquid crystal layer

5: Pixel electrode layer

6: Common electrode layer

7: The first polarizer

8: The second polarizer

9: Color filter

Claims (13)

A liquid crystal composition, which contains: Liquid crystal molecules Polymerizable monomer A, which has a mesogen skeleton and at least two polymerizable groups bonded to the mesogen skeleton, and all of the polymerizable groups are directly bonded to the mesogen skeleton; and The polymerizable monomer B has a mesogen skeleton and at least two polymerizable groups bonded to the mesogen skeleton, and all the polymerizable groups are bonded to the mesogen skeleton via spacers. The liquid crystal composition according to claim 1, wherein in the polymerizable monomer A, the two polymerizable groups are bonded to almost symmetrical positions at both ends in the long axis direction of the mesogen skeleton. The liquid crystal composition according to claim 1 or 2, wherein in the polymerizable monomer A, the mesogen skeleton has 2 to 4 ring structures. The liquid crystal composition according to claim 3, wherein, in the polymerizable monomer A, the ^mesogen skeleton further includes the following substituent K ^i1A bonded to the ring structure; the substituent K ^i1A represents a halogen atom , Linear or branched alkyl group with 1-40 carbon atoms, linear or branched halogenated alkyl group with 1-40 carbon atoms, linear or branched chain with 1 carbon atom ～40 cyanide alkyl group, or linear or branched alkoxy group with 1-40 carbon atoms, (2 or more secondary carbon atoms in the above-mentioned alkyl group can be -C(=X ⁱ¹ )-And/or-(CH-CN)-substitution, the secondary carbon atom in the above alkyl group can be -C (=CH ₂ ) -, -C (=CHR ⁱ³ )-in a way that oxygen atoms are not directly adjacent to each other. , -C (=CR ⁱ³ ₂ ) -, -CH=CH-, -C≡C-, -O-, -NH-, -COO- or -OCO- substituted, the end of the above alkyl group can be OH, NH ₂ or CN substitution; in the formula, X ⁱ¹ represents an oxygen atom, a sulfur atom, NH or NR ⁱ³ , and R ⁱ³ represents a linear or branched alkyl group with 1 to 20 carbon atoms (wherein the alkyl group Secondary carbon atoms can be replaced by -O-, -CH=CH- or -C≡C- in a way that oxygen atoms are not directly adjacent to each other)). The liquid crystal composition according to any one of claims 1 to 4, wherein in the polymerizable monomer B, the mesogen skeleton contains 2 to 4 ring structures. The liquid crystal composition according to claim 5, wherein in the polymerizable monomer B, the 2 to 4 ring structures in the mesogen skeleton form a bonded polycyclic structure. The liquid crystal composition according to claim 6, wherein, in the polymerizable monomer B, the ^mesogen skeleton further includes the following substituent K ^i1B bonded to the ring structure; the substituent K ^i1B represents a halogen atom , Linear or branched alkyl group with 1-40 carbon atoms, linear or branched halogenated alkyl group with 1-40 carbon atoms, linear or branched chain with 1 carbon atom ～40 cyanide alkyl group, or linear or branched alkoxy group with 1-40 carbon atoms, (2 or more secondary carbon atoms in the above-mentioned alkyl group can be -C(=X ⁱ¹ )-And/or-(CH-CN)-substitution, the secondary carbon atom in the above alkyl group can be -C (=CH ₂ ) -, -C (=CHR ⁱ³ )-in a way that oxygen atoms are not directly adjacent to each other. , -C (=CR ⁱ³ ₂ ) -, -CH=CH-, -C≡C-, -O-, -NH-, -COO- or -OCO- substituted, the hydrogen atom in the above alkyl group can be replaced by P -Sp- substitution, the end of the above-mentioned alkyl group can be substituted by OH, NH ₂ or CN; in the formula, X ⁱ¹ represents an oxygen atom, a sulfur atom, NH or NR ⁱ³ , and R ⁱ³ represents a linear or branched carbon atom An alkyl group of 1 to 20 (wherein, the secondary carbon atom in the alkyl group can be substituted by -O-, -CH=CH- or -C≡C- in a way that oxygen atoms are not directly adjacent to each other), P means polymerization Sex base, Sp stands for spacer base). The liquid crystal composition according to any one of claims 1 to 7, wherein the amount of the polymerizable monomer A is 25 to 75 mass relative to the total amount of the polymerizable monomer A and the polymerizable monomer B %. The liquid crystal composition according to any one of claims 1 to 8, wherein the total amount of the polymerizable monomer A and the polymerizable monomer B contained in the liquid crystal composition is relative to 100 masses of the liquid crystal molecules Parts, 0.1 to 3 parts by mass. A liquid crystal display element is provided with two substrates, and a liquid crystal layer provided between the two substrates, the liquid crystal layer containing the liquid crystal composition according to any one of claims 1 to 9. The liquid crystal display element according to claim 10, wherein the liquid crystal layer contains a polymer of the polymerizable monomer A and the polymerizable monomer B. The liquid crystal display device according to claim 10 or 11, which is used for active matrix driving. The liquid crystal display element according to any one of claims 10 to 12, which is a PSA type, PSVA type, VA type, IPS type, FFS type or ECB type.

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