JP6870217B2 - Liquid crystal display element - Google Patents

Description

The present invention relates to a liquid crystal display element.

In recent years, liquid crystal display devices with unprecedented designs have been developed for practical use. For example, a transparent display, a flexible display and the like can be mentioned.

Further, liquid crystal display elements used in liquid crystal display devices have also been diversified. For example, polymer-dispersed liquid crystal display elements in which a liquid crystal composition is held in a polymer network have been put into practical use. Such a polymer-dispersed liquid crystal display element does not require a polarizing plate and has an advantage that a bright display can be easily obtained (for example, Patent Document 1).

Japanese Patent No. 5099396

Since the conventional polymer-dispersed liquid crystal display element is a display element using light scattering, it cannot be applied to applications requiring high transparency, particularly a transmissive liquid crystal display device. For example, a polymer-dispersed liquid crystal display element is suitable for a flexible display due to its high stress resistance, but cannot be applied to a transmissive flexible display.

The present invention provides a liquid crystal display element capable of solving the above problems and realizing a new display medium.

In the present invention, a first transparent insulating substrate having a pixel electrode and a second transparent insulating substrate having a common electrode are arranged to face each other at regular intervals, and the two substrates or the pixel electrode and the common electrode are placed between the two substrates. A dimming layer containing a polymer matrix and a liquid crystal composition is arranged on the first transparent insulating substrate having the polymer matrix, and the polymer matrix has nanovoids of 20 nm or more and 400 nm or less. G)

It is a liquid crystal display element characterized by containing a compound represented by.

The liquid crystal display element of the present invention has a high transmittance for visible light. The liquid crystal display element of the present invention can be applied to display elements such as liquid crystal TVs and monitors that require high transmittance.

Further, the liquid crystal display element of the present invention has high stress resistance, and even if it receives stress due to pressing pressure or bending, display defects due to misalignment of liquid crystal compounds like a conventional liquid crystal display device using a liquid crystal composition Is hard to cause.

Therefore, the display element using the composite resin particles of the present invention is particularly suitable as a display element for a flexible display.

The figure which shows typically an example of the structure of the liquid crystal display element of this invention. An enlarged plan view of the region of the electrode layer 3 formed on the substrate 2 in FIG. 1 surrounded by the line II. A cross-sectional view of the liquid crystal display element shown in FIG. 1 cut in the direction of lines III-III in FIG. An enlarged plan view of another example of the region surrounded by the line II of the electrode layer 3 formed on the substrate 2 in FIG. Cross-sectional view of another example in which the liquid crystal display element shown in FIG. 1 is cut in the direction of lines III-III in FIG. Enlarged plan view of the electrode configuration of the liquid crystal display element

The liquid crystal display device of the present invention includes a dimming layer containing a polymer matrix in which the size of voids is controlled in a specific range.
(Composition of polymer matrix)
The polymer matrix is a polymer or copolymer containing one or more polymerizable compounds as a monomer unit.

The polymerizable compound has the following general formula (P).

(In the general formula (P), Z ^p1 is an alkyl group having 1 to 15 carbon atoms in which a fluorine atom, a cyano group, a hydrogen atom, or a hydrogen atom may be replaced with a halogen atom, and a hydrogen atom is a halogen atom. An alkoxy group having 1 to 15 carbon atoms which may be substituted, an alkenyl group having 1 to 15 carbon atoms whose hydrogen atom may be substituted by a halogen atom, and a hydrogen atom may be substituted by a halogen atom. Represents an alkenyloxy group having 1 to 15 carbon atoms or -Sp ^p2 -R ^p2 .
R ^p1 and R ^p2 are independently derived from the following equations (RI) to (R-IX):

Represents either, in the formula (R-I) ~ (R -IX), R 2 ~R 6 are independently of each other, hydrogen atom, the number 1-5 alkyl group or a number of carbon atoms of carbon atoms 1 to 5 alkyl halide groups, W is a single bond, -O- or methylene group, T is a single bond or -COO-, and p, t and q are independently 0, respectively. Represents 1 or 2
Sp ^p1 and Sp ^p2 represent spacer groups, and Sp ^p1 and Sp ^p2 are independently single bonds, alkylene groups having 1 to 12 carbon atoms, or —O— (CH ₂ ) _s − (in the formula, s is). It represents an integer of 1 to 11 and the oxygen atom is bound to the aromatic ring.) L ^p1 and L ^p2 are independently single-bonded, -O-, -S-, -CH _2- , respectively. _{-OCH 2 -, - CH 2 O} -, - CO -, - C 2 H 4 -, - COO -, - OCO -, - OCOOCH 2 -, - CH 2 OCOO -, - OCH 2 CH 2 O -, - CO-NR ^a −, −NR ^a −CO−, −SCH _2- , −CH ₂ S−, −CH = CR ^a −COO−, −CH = CR ^a −OCO−, −COO-CR ^a = CH− ^{, -OCO-CR a = CH -} , - COO-CR a = CH-COO -, - COO-CR a = CH-OCO -, - OCO-CR a = CH-COO -, - OCO-CR a = CH -OCO-,-(CH ₂ ) _z- C (= O) -O-,-(CH ₂ ) z-O- (C = O)-, -O- (C = O)-(CH ₂ ) z -,-(C = O) -O- (CH ₂ ) z-, -CH = CH-, -CF = CF-, -CF = CH-, -CH = CF-, -CF _2- , -CF ₂ O-, -OCF _2- , -CF ₂ CH _2- , -CH ₂ CF _2- , -CF ₂ CF _2- or -C ≡ C- (In the formula, ^Ra is an independent hydrogen atom or carbon atom, respectively. Represents an alkyl group of numbers 1 to 4, and in the above formula, z represents an integer of 1 to 4).
M ^p2 is 1,4-phenylene group, 1,4-cyclohexylene group, anthracene-2,6-diyl group, phenanthrene-2,7-diyl group, pyridine-2,5-diyl group, pyrimidin-2, 5-diyl group, naphthalene-2,6-diyl group, indan-2,5-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or 1,3-dioxane-2,5 -Representing a diyl group, M ^p2 is unsubstituted or an alkyl group having 1 to 12 carbon atoms, an alkyl halide group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, and a carbon atom. It may be substituted with a halogenated alkoxy group of numbers 1 to 12, a halogen atom, a cyano group, a nitro group or -R ^p1.
M ^p1 is expressed by the following equations (i-11) to (ix-11):

(In the formula, ★ ^{binds to Sp p1} and ★★ binds to L ^p1 or L ^p2 .)
M ^p3 is expressed by the following equations (i-13) to (ix-13):

(In the formula, ★ ^{binds to Z p1} and ★★ binds to L ^p2 .)
m ^{p2 to} m ^p4 independently represent 0, 1, 2 or 3, and m ^p1 and m ^p5 independently represent 1, 2 or 3, respectively, but when there are a plurality of ^{Z p1, they represent. May} be the same or different, if there are a plurality of R ^{p1, they may be the same or different, and if there are a plurality of R p2} , they may be the same. They may be different, they may be the same or different when there are a plurality of Sp ^p1, and they may be the same or different when there are a plurality of ^{Sp p2.} When ^{there are a plurality of L p1} , they may be the same or different, and ^{when there are a plurality of M p2} , they may be the same or different. ) Is preferable. Moreover, it is preferable that the polymer matrix contains one kind or two or more kinds of the polymerizable compound.

In the general formula (P) according to the present invention, Z ^p1 is ^{preferably −Sp p2-} R ^p2 , and R ¹¹ and R ¹² are independently of formulas (R-1) to (R-3), respectively. It is preferably either.

Further, in the general formula (P), ^{it is preferable that m p1} + m ^p5 is 2 or more.

Further, in the general formula ^{(P), L p1} represents a single _{bond, -OCH 2 -, - CH 2} O -, - CO -, - C 2 H 4 -, - COO -, - OCO -, - COOC 2 _{H 4 -, - OCOC 2 H} 4 -, - C 2 H 4 OCO -, - C 2 H 4 COO -, - CH = CH -, - CF 2 -, - CF 2 O -, - (CH 2) z -C (= O) -O-,-(CH ₂ ) z-O- (C = O)-, -O- (C = O)-(CH ₂ ) z-, -CH = CH-COO-, -COO-CH = CH-, -OCOCH = CH-,-(C = O) -O- (CH ₂ ) z-, -OCF _2- or -C ≡ C-, where L ^p2 is -OCH _{2 CH 2 O -, - COOC 2} H 4 -, - OCOC 2 H 4 -, - (CH 2) z -C (= O) -O -, - (CH 2) z-O- (C = O) - , -O- (C = O)-(CH ₂ ) z-,-(C = O) -O- (CH ₂ ) z-, -CH = CH-COO-, -COO-CH = CH-,- OCOCH = CH-, -C ₂ H ₄ OCO- or -C ₂ H ₄ COO-, and z in the above formula is preferably an integer of 1 to 4.

^{Further, at least one of L p1} and L ^p2 of the general formula (P) is − (CH ₂ ) _z −C (= O) −O−, − (CH ₂ ) z−O− (C = O). It is preferably at least one selected from the group consisting of − and −O− (C = O) − (CH ₂ ) z−, − (C = O) −O− (CH _{2) z−.}

Further, in the general formula (P), R ^p1 and R ^p2 are independently derived from the following formulas (R-1) to formulas (R-15):

Is more preferable.

^{Further, m p3} of the general formula (P) represents 0, 1, 2 or 3, and when m ^p2 is 1, L ^p1 is a single bond, and when m ^p2 is 2 or 3, there are a plurality of L ^p1 . At least one is preferably a single bond.

^{Further, m p3} of the general formula (P) represents 0, 1, 2 or 3, and when m ^p3 is 1, M ^p2 is a 1,4-phenylene group, and when m ^p3 is 2 or 3, there are a plurality of them. ^{M p2} adjacent to ^{M p1} through at least ^{L p1} of ^{M p2} which is preferably a 1,4-phenylene group.

^{Further, m p3} of the general formula (P) represents 0, 1, 2 or 3, and ^{at least one of M p2} is a 1,4-phenylene group substituted with one or more fluorines. Is preferable.

Further, the ^{m p4} of general formula (P) represents 0, 1, 2 or ^3, at least one of ^{M p3,} is one or more fluorine are substituted 1,4-phenylene group Is preferable.

Further, as the spacer group (Sp ^p1 , Sp ^p2 , Sp ^p4 ) in the general formula (P), a single bond, -OCH ₂ -,-(CH ₂ ) _z O-, -CO-, -C ₂ H _{4 -, - COO -, - OCO} -, - COOC 2 H 4 -, - OCOC 2 H 4 -, - (CH 2) z -, - C 2 H 4 OCO -, - C 2 H 4 COO -, - CH = CH-, -CF _2- , -CF ₂ O-,-(CH ₂ ) _z- C (= O) -O-,-(CH ₂ ) _z- O- (C = O)-, -O- _{(C = O) - (CH} 2) z -, - (C = O) -O- (CH 2) z -, - O- (CH 2) z -O -, - OCF 2 -, - CH = CH -COO-, -COO-CH = CH-, -OCOCH = CH- or -C≡C- are preferable, and Z is preferably an integer of 1 or more and 10 or less.

The polymerizable compound of the general formula (P) according to the present invention is represented by the general formula (P-a), the general formula (P-b), the general formula (P-c) and the general formula (P-d). It is preferably at least one compound selected from the group consisting of compounds.

In the general formulas (P-a) to (P-d), R ^p1 and R ^p2 are independently derived from the following formulas (RI) to formula (R-IX):

Represents either, in the formula (R-I) ~ (R -IX), R 2 ~R 6 are independently of each other, hydrogen atom, the number 1-5 alkyl group or a number of carbon atoms of carbon atoms 1 to 5 alkyl halide groups, W is a single bond, -O- or methylene group, T is a single bond or -COO-, and p, t and q are independently 0, respectively. Represents 1 or 2
Rings A and B are independently 1,4-phenylene group, 1,4-cyclohexylene group, anthracene-2,6-diyl group, phenanthrene-2,7-diyl group, pyridine-2,5- Diyl group, pyrimidin-2,5-diyl group, naphthalene-2,6-diyl group, indan-2,5-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or 1, Represents a 3-dioxane-2,5-diyl group, which is unsubstituted or an alkyl group having 1 to 12 carbon atoms, an alkyl halide group having 1 to 12 carbon atoms, and an alkoxy having 1 to 12 carbon atoms. It is preferably substituted with a group, a halogenated alkoxy group having 1 to 12 carbon atoms, a halogen atom, a cyano group, a nitro group or −R ^p1.
Ring C has the following equations (ci) to (c-ix):

(In the formula, ★ ^{binds to Sp p1} and ★★ binds to L ^p5 or L ^p6 .)
It is preferable that Sp ^p1 and Sp ^p4 represent a spacer group, and X ^{p1 to} X ^p4 each independently represent a hydrogen atom or a halogen atom.
L ^{p4, L p5} and ^{L p6} each independently represent a single _{bond, -OCH 2 -, - CH 2} O -, - CO -, - C 2 H 4 -, - COO -, - OCO -, - COOC 2 _{H 4 -, - OCOC 2 H} 4 -, - C 2 H 4 OCO -, - C 2 H 4 COO -, - CH = CH -, - CF 2 -, - CF 2 O -, - (CH 2) z -C (= O) -O-,-(CH ₂ ) _z- O- (C = O)-, -O- (C = O)-(CH ₂ ) _z -,-(C = O) -O -(CH ₂ ) _z- , -O- (CH ₂ ) _z- O-, -OCF _2- , -CH = CHCOO-, -COOCH = CH-, -OCOCH = CH- or -C≡C-. It is preferable that z in the above formula is an integer of 1 to 4.

L ^p3 is preferably -CH = CHCOO-, -COOCH = CH- or -OCOCH = CH-.

In the compound represented by the general formula (P-a), m ^p6 and m ^p7 preferably independently represent 0, 1, 2 or 3, respectively. Further, it is more preferable that ^{m p6} + m ^{p7 = 2 to 5.}

In the compound represented by the general formula (Pd), m ^p12 and m ^p15 preferably independently represent ^{1, 2 or 3, respectively, and m p13} preferably represents 0, 1, 2 or 3. m ^p14 preferably represents 0 or 1. Further, it is more preferable that ^{m p12} + m ^{p15 = 2 to 5.} When ^{there are a plurality of R p1} , they may be the same or different, and ^{when there are a plurality of R p1} , they may be the same or different, and there are a plurality of ^{R p2.} In some cases, they may be the same or different, ^{if there are multiple Sp p1} , they may be the same or different, and ^{if there are multiple Sp p4} , they may be the same. They may be the same or different when there are a plurality of L ^p4 and L ^p5, and they may be the same when there are a plurality of rings A to C. It may be different.

Hereinafter, preferred structures of the compounds represented by the general formulas (Pa) to (Pd) according to the present invention will be illustrated.

Preferred examples of the compound represented by the general formula (P-a) according to the present invention include polymerizable compounds represented by the following formulas (P-a-1) to (P-a-31).

Preferred examples of the compound represented by the general formula (P-b) according to the present invention include polymerizable compounds represented by the following formulas (P-b-1) to (P-b-34).

Preferred examples of the compound represented by the general formula (P-c) according to the present invention include polymerizable compounds represented by the following formulas (P-c-1) to (P-c-52).

The compound represented by the general formula (Pd) according to the present invention is preferably a compound represented by the following general formula (Pd').

(In the compound represented by the general formula (P-d'), ^mp10 more preferably represents 2 or 3. Other symbols are the same as the general formula (pd) and are omitted.)
Preferred examples of the compound represented by the general formula (Pd) according to the present invention include polymerizable compounds represented by the following formulas (Pd-1) to (Pd-31).

The "alkyl group having 1 to 15 carbon atoms" according to the present invention is preferably a linear or branched alkyl group, and more preferably a linear alkyl group. Further, in the general formula (1), R ¹ and R ² are independently alkyl groups having 1 to 15 carbon atoms, and R ¹ and R ² are independent of each other and have 1 to 1 carbon atoms. Eight alkyl groups are preferable, and alkyl groups having 1 to 6 carbon atoms are more preferable.

Examples of the "alkyl group having 1 to 15 carbon atoms" according to the present invention include a methyl group, an ethyl group, a propyl group, a butyl group, an isopropyl group, an isobutyl group, a t-butyl group, a 3-pentyl group, and an isopentyl group. Examples thereof include a group, a neopentyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, a nonyl group, a decyl group, a dodecyl group, and a pentadecyl group. In the present specification, examples of alkyl groups are common, and are appropriately selected from the above examples according to the number of carbon atoms of each alkyl group.

The example of the "alkoxy group having 1 to 15 carbon atoms" according to the present invention preferably exists at a position where at least one oxygen atom in the substituent is directly bonded to the ring structure, and is preferably a methoxy group or an ethoxy group. Groups, propoxy groups (n-propoxy group, i-propoxy group), butoxy groups, pentyloxy groups, octyloxy groups and decyloxy groups are more preferable. In the present specification, examples of alkoxy groups are common, and they are appropriately selected from the above examples according to the number of carbon atoms of each alkoxy group.

Examples of the "alkenyl group having 2 to 15 carbon atoms" according to the present invention include a vinyl group, an allyl group, a 1-propenyl group, an isopropenyl group, a 2-butenyl group, a 3-butenyl group, and a 1,3-butadienyl group. Examples thereof include a group, a 2-pentenyl group, a 3-pentenyl group, a 2-hexenyl group and the like. Further, more preferable alkenyl groups according to the present invention include the following formulas (i) (vinyl group), formula (ii) (1-propenyl group), formula (iii) (3-butenyl group) and formula (iv). ) (3-Pentenyl group):

(In the above formulas (i) to (iv), * indicates a binding site to the ring structure.)
However, when the liquid crystal composition of the present invention contains a polymerizable monomer, the structures represented by the formulas (ii) and (iv) are preferable, and the structure represented by the formula (ii) is more preferable. preferable. In the present specification, examples of alkenyl groups are common, and are appropriately selected from the above examples according to the number of carbon atoms of each alkenyl group.

In addition, the polymerizable compound has the following general formula (i).

(I)
(In the formula, R represents an alkyl group having 3 to 40 carbon atoms, except that the carbon atom in the alkyl group is
a) Replaced with -O-, -CO-O-, -OCO-, -NHCO-O-, -OCONH-, or arylene groups with 6-12 carbon atoms as oxygen atoms do not bond directly to each other. May be
b) It may have an alkyl group having 1 to 15 carbon atoms as a substituent, and A ₁ is -O-, -CO-O-, -OCO-, -NHCO-O-, -OCONH-, Alternatively, an alkylene group (however, the carbon atoms in the alkylene group are -O-, -CO-O-, -OCO-, -NHCO-O-, and -OCONH- as those in which oxygen atoms are not directly bonded to each other. , It may be replaced with an alicyclic group having 6 to 12 carbon atoms or an arylene group having 6 to 12 carbon atoms), and when tracing the bond between two carbon atoms to which _{A 1 is bonded.} It represents a linking group in which the number of bonds Na1 contained is 3 to 40, and A ₂ is an -O-, -CO-O-, -OCO-, -NHCO-O-, -OCONH-, or an alkylene group (provided that it is an alkylene group. The carbon atoms in the alkylene group are -O-, -CO-O-, -OCO-, -NHCO-O-, -OCONH-, and have 6 to 6 carbon atoms, assuming that the oxygen atoms are not directly bonded to each other. It represents 12 alicyclic group, or may) be replaced by an arylene group having 6 to 12 carbon atoms _of, a 3 is, -O -, - CO-O -, - OCO -, - NHCO-O- , -OCONH-, an alkylene group, an alkyltriyl group, or an alkyltetrayl group (provided that the carbon atoms in the alkylene group, the alkyltriyl group, or the alkyltetrayl group have oxygen atoms directly with each other. As non-bonded groups, -O-, -CO-O-, -OCO-, -NHCO-O-, -OCONH-, an alicyclic group having 6 to 12 carbon atoms, or an arylene group having 6 to 12 carbon atoms. It may be replaced), and represents a linking group in which the number of bonds Na _{2 contained in −A 2} −A ₃ −A _{2 − is 3 to 40.}
B ₁ represents a hydrogen atom or a methyl group, B ₂ represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, and a plurality of R, A ₁ , A ₂ , A ₃ , B ₁ and B ₂ are the same. It may be different, and m represents an integer of 2 to 4). The polymer matrix preferably contains one or more of the polymerizable compounds.
(Liquid crystal composition)
The liquid crystal composition has a general formula (G).

^{(Wherein, R G1} is one or two or more CH ₂ groups in. The alkyl group represents an alkyl group having 1 to 15 carbon atoms, as the oxygen atoms are not directly adjacent, -O-, It may be substituted with −CH = CH−, −CO−, −OCO−, −COO− or −C≡C−, and one or more hydrogen atoms in the alkyl group are optionally substituted with halogen atoms. May have been
A ^G1 and A ^G2 are independent of each other.
(A) Trans-1,4-cyclohexylene group (one CH ₂ group existing in this group or two or more CH _two groups not adjacent to each other may be substituted with an oxygen atom or a sulfur atom. .),
(B) 1,4-phenylene group (one CH group existing in this group or two or more CH groups not adjacent to each other may be substituted with a nitrogen atom), and (c) 1 , 4-Bicyclo (2.2.2) octylene group, naphthalene-2,6-diyl group, naphthalene-3,7-diyl group, decahydronaphthalene-2,6-diyl group, 1,2,3,4 Represents a group selected from the group consisting of a −tetrahydronaphthalene-2,6-diyl group or a chroman-2,6-diyl group, which is included in the above group (a), group (b) or group (c). One or more hydrogen atoms may be substituted with _{fluorine atom, chlorine atom, -CF 3} or -OCF _{3, respectively.}
Z ^G1 is a single bond, -CH = CH -, - CF = CF -, - C≡C -, - CH 2 CH 2 -, - (CH 2) 4 -, - OCH 2 -, - CH 2 O-, Represents -OCF _2- , -CF ₂ O-, -COO- or -OCO-
Y ^G1 represents a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, and an alkyl group having 1 to 15 carbon atoms, and one or more CH ₂ groups in the alkyl group have an oxygen atom directly. It may be replaced with −O−, −CH = CH−, −CO−, −OCO−, −COO−, −C≡C−, −CF ₂ O−, −OCF _{2− so as not to be adjacent to each other.} One or more hydrogen atoms in the alkyl group may optionally be substituted with halogen atoms.
n ^G1 represents an integer from 0 to 4. When n ^G1 represents 2, 3 or 4, and a ^{plurality of AG1s} are present in the general formula (G), the plurality of ^AG1s may be the same or different, and a ^{plurality of ZG1s} are present. In this case, a plurality of Z ^G1s may be the same or different. ) Is preferably included.

The liquid crystal composition has a general formula (L).

(Wherein, R ^L1 and R ^L2 represent each independently an alkyl group having 1 to 8 carbon atoms, one or non-adjacent two or more -CH 2 in the alkyl group _- is independently It may be replaced by −CH = CH−, −C≡C−, −O−, −CO−, −COO− or −OCO−.
n ^L1 represents 0, 1, 2 or 3
A ^{L1, A L2,} and ^{A L3} each independently (a) 1,4-cyclohexylene group (this is present in the group one -CH ₂ - or nonadjacent two or more -CH ₂ - May be replaced with -O-) and (b) 1,4-phenylene group (one -CH = present in this group or two or more non-adjacent -CH = -N = May be replaced with)
(C) Naphthalene-2,6-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or decahydronaphthalene-2,6-diyl group (naphthalene-2,6-diyl group or One -CH = existing in the 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or two or more non-adjacent -CH = may be replaced with -N =)
Represents a group selected from the group consisting of, and the above groups (a), groups (b) and groups (c) may be independently substituted with cyano groups, fluorine atoms or chlorine atoms, respectively.
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 Represents −, −CF ₂ O−, −CH = NN = CH−, −CH = CH−, −CF = CF− or −C≡C−.
If n ^L1 is 2 or 3 and there ^{are a plurality of A L2s} , they may be the same or different, and if n ^L1 is 2 or 3 and there are a plurality of ^{Z L2s, they may be the same or different.} May be the same or different).

The liquid crystal composition preferably contains one or more compounds selected from the compounds represented by the general formulas (N-1), (N-2) and (N-3). These compounds are dielectrically negative compounds (the sign of Δε is negative and their absolute value is greater than 2).

(In the formula, ^RN11 , ^RN12 , ^RN21 , ^RN22 , ^RN31 and ^RN32 each independently represent an alkyl group having 1 to 8 carbon atoms, and one or two non-adjacent alkyl groups in the alkyl group. More than one −CH ₂₋ may be independently substituted by −CH = CH−, −C≡C−, −O−, −CO−, −COO− or −OCO−.
A ^N11 , A ^N12 , A ^N21 , A ^N22 , A ^N31 and A ^N32 are independently (a) 1,4-cyclohexylene groups (one -CH _2- or adjacent to each other in this group). No two or more -CH _2- may be replaced by -O-) and (b) 1,4-phenylene group (one -CH = or non-adjacent 2 present in this group) More than one -CH = may be replaced with -N =.)
(C) Naphthalene-2,6-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or decahydronaphthalene-2,6-diyl group (naphthalene-2,6-diyl group or One -CH = existing in the 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or two or more non-adjacent -CH = may be replaced with -N =. )
(D) Represents a group selected from the group consisting of 1,4-cyclohexenylene groups, and the above groups (a), group (b), group (c) and group (d) are independently cyano groups, respectively. It may be replaced with a fluorine atom or a chlorine atom.
^{Z N11, Z N12, Z N21} , Z N22, Z N31 and ^{Z N32} are each independently a single _{bond, -CH 2 CH 2 -, -} (CH 2) 4 -, - OCH 2 -, - CH 2 O- , -COO-, -OCO-, -OCF _2- , -CF ₂ O-, -CH = NN = CH-, -CH = CH-, -CF = CF- or -C≡C-
X ^N21 represents a hydrogen atom or a fluorine atom.
^TN31 represents −CH _2- or an oxygen atom and represents
n ^N11 , n ^N12 , n ^N21 , n ^N22 , n ^N31 and n ^N32 each independently represent an integer of 0 to 3, but n ^N11 + n ^N12 , n ^N21 + n ^N22 and n ^N31 + n ^N32 are independent of each other. If it is 1, 2 or 3, and ^{there are a plurality of A N11 to} A ^N32 and Z ^{N11 to} Z ^N32 , they may be the same or different. )
The compounds represented by the general formulas (N-1), (N-2) and (N-3) are preferably compounds having a negative Δε and an absolute value of more than 3.

In the general formulas (N-1), (N-2) and (N-3), ^RN11 , ^RN12 , ^RN21 , ^RN22 , ^RN31 and ^RN32 are independent of each other and have 1 to 8 carbon atoms. Alkyl group, alkoxy group having 1 to 8 carbon atoms, alkenyl group having 2 to 8 carbon atoms or alkenyloxy group having 2 to 8 carbon atoms is preferable, and alkyl group having 1 to 5 carbon atoms and carbon atom number of carbon atoms are preferable. Alkoxy groups 1 to 5, alkenyl groups having 2 to 5 carbon atoms, or alkenyloxy groups having 2 to 5 carbon atoms are preferable, and alkyl groups having 1 to 5 carbon atoms or alkenyl groups having 2 to 5 carbon atoms are preferable. More preferably, an alkyl group having 2 to 5 carbon atoms or an alkoxy group having 2 to 3 carbon atoms is further preferable, and an alkenyl group (propenyl group) having 3 carbon atoms is particularly preferable.

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

The alkenyl group is preferably selected from the groups represented by any of the formulas (R1) to (R5). (The black dots in each equation represent carbon atoms in the ring structure.)

^AN11 , ^AN12 , ^AN21 , ^AN22 , ^AN31 and ^AN32 are preferably aromatics when it is required to increase Δn independently, and fats are used to improve the response rate. It is preferably a group, and is preferably a trans-1,4-cyclohexylene group, a 1,4-phenylene group, a 2-fluoro-1,4-phenylene group, a 3-fluoro-1,4-phenylene group, 3,5. -Difluoro-1,4-phenylene group, 2,3-difluoro-1,4-phenylene group, 1,4-cyclohexenylene group, 1,4-bicyclo [2.2.2] octylene group, piperidine-1 , 4-Diyl group, naphthalene-2,6-diyl group, decahydronaphthalene-2,6-diyl group or 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, which are preferably represented as follows. It is more preferable to represent the structure of

It is more preferable to represent a trans-1,4-cyclohexylene group, a 1,4-cyclohexenylene group or a 1,4-phenylene group.

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

Fluorine atom is preferable for X ^N21.

Oxygen atom is preferable for ^TN31.

n ^N11 + n ^N12 , n ^N21 + n ^N22 and n ^N31 + n ^N32 are preferably 1 or 2, n ^N11 is 1 and n ^N12 is 0, n ^N11 is 2 and n ^N12 is 0, n ^{A combination of N11} being 1 and n ^N12 being 1, a combination of n ^N11 being 2 and n ^N12 being 1, a combination of n ^N21 being 1 and n ^N22 being 0, n ^N21 being 2 and n ^N22 being A combination of 0, a combination of n ^N31 being 1 and n ^N32 being 0, and a combination of n ^N31 being 2 and n ^N32 being 0 are preferred.

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

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

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

When a composition that keeps the viscosity of the liquid crystal composition low and has a high response speed is required, it is preferable that the above lower limit value is low and the upper limit value is low. Further, when a composition having a high Tni of the liquid crystal composition and good temperature stability is required, it is preferable that the above lower limit value is low and the upper limit value is low. Further, when it is desired to increase the dielectric anisotropy in order to keep the drive voltage low, it is preferable that the above lower limit value is high and the upper limit value is high.

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

^{(Wherein, R N11} and ^{R N12} are as defined ^{R N11} and ^{R N12} in the general formula ^{(N-1), n Na11} represents 0 or ^{1, n NB11} represents 0 or ^{1, n NC11} is ^{Represents 0 or 1, n Nd11} represents 0 or 1, n Ne11 represents 1 or 2, n ^Nf11 represents 1 or 2, n ^{Ng 11} represents 1 or 2, and A ^{Ne 11} represents trans-1,4. ^{-Represents a} cyclohexylene group or a 1,4-phenylene group, and A Ng11 represents a trans-1,4-cyclohexylene group, a 1,4-cyclohexenylene group or a 1,4-phenylene group, but at least one. Represents a 1,4-cyclohexenylene group, Z ^{Ne 11} represents a single bond or ethylene, but at least one represents ethylene.)
More specifically, the compound represented by the general formula (N-1) may be a compound selected from the compound group represented by the general formulas (N-1-1) to (N-1-21). preferable.

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

^{(Wherein, R N111} and ^{R N112} each independently represents the same meaning as ^{R N11} and ^{R N12} in the general formula (N).)
^RN111 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and preferably a propyl group, a pentyl group or a vinyl group. ^RN112 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and preferably an ethoxy group or a butoxy group.

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

When the improvement of Δε is emphasized, it is preferable to set the content high, when the solubility at low temperature is emphasized, the effect is high when the content is set high, and _{when the TNI} is emphasized, the content is set high. The effect is high when set to a small value. Further, when improving the dripping marks and the seizure characteristics, it is preferable to set the content range in the middle.

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

Further, the compound represented by the general formula (N-1-1) is a compound selected from the compound group represented by the formulas (N-1-1.1) to (N1-1.23). It is preferable that the compound is represented by the formulas (N-1-1.1) to (N-1-1.4), and the formulas (N-1-1.1) and the formula (N-1-1.4) are preferable. The compound represented by -1-1.3) is preferable.

The compounds represented by the formulas (N-1-1.1) to (N-1-1.22) can be used alone or in combination, but the total amount of the liquid crystal composition may be increased. On the other hand, the lower limit of the preferable content of these compounds alone or of these compounds is 5%, 10%, 13%, 15%, 17%, 20%, and 23%. , 25%, 27%, 30%, 33%, 35%. The upper limit of the preferable content is 50%, 40%, 38%, 35%, 33%, 30%, and 28% with respect to the total amount of the liquid crystal composition. Yes, 25%, 23%, 20%, 18%, 15%, 13%, 10%, 8%, 7%, 6% Yes, 5%, and 3%.

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

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

The compound represented by the general formula (N-1-2) can be used alone, or two or more compounds can be used in combination. The types of compounds that can be combined are not particularly limited, but they are appropriately combined and used according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, three types, four types, and five or more types as one embodiment of the present invention.

It is preferable to set a higher content in the case of emphasizing improved [Delta] [epsilon], to emphasize the solubility at low temperature highly effective when fewer to set the content, when importance is attached to T _NI content The effect is high if you set a large amount. Further, when improving the dripping marks and the seizure characteristics, it is preferable to set the content range in the middle.

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

Further, the compound represented by the general formula (N-1-2) is a compound selected from the compound group represented by the formulas (N-1-2.1) to (N-1-2.22). It is preferable that there are formulas (N-1-2.3) to formulas (N-1-2.7), formulas (N1-2.10), formulas (N-1-2.11), and formulas. It is preferable that the compound is represented by (N-1-2.13) and the formula (N1-2.20), and when the improvement of Δε is emphasized, the formula (N-1-2.3) is used. is preferably a compound represented by the formula (N-1-2.7) _from when emphasizing improvements in _{T NI} formula (N-1-2.10), formula (N-1-2.11) And the compound represented by the formula (N-1-2.13) is preferable, and the compound represented by the formula (N-1-2.20) is used when the improvement of the response speed is emphasized. Is preferable.

The compounds represented by the formulas (N-1-2.1) to (N-1-2.22) can be used alone or in combination, but the total amount of the liquid crystal composition. The lower limit of the preferred content of alone or of these compounds is 5%, 10%, 13%, 15%, 17%, 20%, 23%. Yes, 25%, 27%, 30%, 33%, 35%. The upper limit of the preferable content is 50%, 40%, 38%, 35%, 33%, 30%, and 28% with respect to the total amount of the liquid crystal composition. Yes, 25%, 23%, 20%, 18%, 15%, 13%, 10%, 8%, 7%, 6% Yes, 5%, and 3%.

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

^{(Wherein, R N131} and ^{R N132} each independently represents the same meaning as ^{R N11} and ^{R N12} in the general formula (N).)
^RN131 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, preferably an ethyl group, a propyl group or a butyl group. ^RN132 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 3 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms, and preferably a 1-propenyl group, an ethoxy group, a propoxy group or a butoxy group. ..

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

When the improvement of Δε is emphasized, it is preferable to set the content high, when the solubility at low temperature is emphasized, the effect is high when the content is set high, and _{when the TNI} is emphasized, the content is set high. The effect is high when is set to a large extent. Further, when improving the dripping marks and the seizure characteristics, it is preferable to set the content range in the middle.

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

Further, the compound represented by the general formula (N-1--3) is a compound selected from the compound group represented by the formulas (N-1-3.21) to (N-1-3.21). It is preferable that the compound is represented by the formulas (N-1-3.1) to (N-1-3.7) and (N-1-3.21), and is preferably the compound represented by the formula (N-1-3.21). -1-3.1), Eq. (N-1-3.2), Eq. (N-1-3.3), Eq. (N-1-3.4) and Eq. (N-1-3.6) ) Is preferable.

The compounds represented by the formulas (N-1-3.1) to (N-1-3.4), the formula (N-1-3.6) and the formula (N-1-3.21) are independent. It can be used in the above or in combination, but it is a combination of the formulas (N-1-3.1) and (N-1-3.2) and the formula (N-1-3.3). ), Formula (N-1-3.4) and formula (N-1-3.6), 2 or 3 combinations are preferred. The lower limit of the preferred content of the liquid crystal composition alone or of these compounds is 5%, 10%, 13%, 15%, 17%, 20%. is there. The upper limit of the preferable content is 35%, 30%, 28%, 25%, 23%, 20%, and 18% with respect to the total amount of the liquid crystal composition. Yes, 15%, 13%.

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

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

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

When the improvement of Δε is emphasized, it is preferable to set the content high, when the solubility at low temperature is emphasized, the effect is high when the content is set high, and _{when the TNI} is emphasized, the content is set high. The effect is high when set to a small value. Further, when improving the dripping marks and the seizure characteristics, it is preferable to set the content range in the middle.

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

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

The compounds represented by the formulas (N-1-4.1) to (N-1-4.14) can be used alone or in combination, but the total amount of the liquid crystal composition may be increased. On the other hand, the lower limit of the preferable content of these compounds alone or these compounds is 3%, 5%, 7%, 10%, 13%, 15%, and 17%. , 20%. The upper limit of the preferable content is 35%, 30%, 28%, 25%, 23%, 20%, and 18% with respect to the total amount of the liquid crystal composition. Yes, 15%, 13%, 11%, 10%, 8%.

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

^{(Wherein, R N151} and ^{R N152} each independently represents the same meaning as ^{R N11} and ^{R N12} in the general formula (N).)
^RN151 and ^RN152 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, preferably an ethyl group, a propyl group, or a butyl group. Is preferable.

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

It is preferable to set a higher content in the case of emphasizing improved [Delta] [epsilon], to emphasize the solubility at low temperature highly effective when fewer to set the content, when importance is attached to T _NI content The effect is high if you set a large amount. Further, when improving the dripping marks and the seizure characteristics, it is preferable to set the content range in the middle.

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

Further, the compound represented by the general formula (N-1-5) is a compound selected from the compound group represented by the formulas (N-1-5.1) to (N-1-5.6). It is preferable that the compound is represented by the formula (N-1-5.1), the formula (N-1-5.2) and the formula (N-1-5.4).

The compounds represented by the formulas (N-1-5.1), (N-1-5.2) and (N-1-5.4) may be used alone or in combination. However, the lower limit of the preferable content of the single compound or these compounds with respect to the total amount of the liquid crystal composition is 5%, 8%, 10%, 13%, and 15%. It is 17% and 20%. The upper limit of the preferable content is 35%, 33%, 30%, 28%, 25%, 23%, and 20% with respect to the total amount of the liquid crystal composition. Yes, 18%, 15%, 13%.

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

^{(Wherein, R N1101} and ^{R N1102} independently represents the same meaning as ^{R N11} and ^{R N12} in the general formula (N).)
^RN1101 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and preferably an ethyl group, a propyl group, a butyl group, a vinyl group or a 1-propenyl group. ^RN1102 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and preferably an ethoxy group, a propoxy group, or a butoxy group.

The compound represented by the general formula (N-1-10) can be used alone, or two or more compounds can be used in combination. The types of compounds that can be combined are not particularly limited, but they are appropriately combined and used according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, three types, four types, and five or more types as one embodiment of the present invention.

It is preferable to set the content higher when the improvement of Δε is emphasized, the effect is higher when the content is set higher when the solubility at low temperature is emphasized, and the content is set _{when the TNI} is emphasized. The effect is high when is set high. Further, when improving the dripping marks and the seizure characteristics, it is preferable to set the content range in the middle.

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

Further, the compound represented by the general formula (N-1-10) is a compound selected from the compound group represented by the formulas (N-1-10.1) to (N-1-10.21). It is preferably represented by the formulas (N-1-10.1) to (N-1-10.5), (N-1-10.20) and (N-1-10.21). It is preferably a compound, preferably of formula (N-1-10.1), formula (N-1-10.2), formula (N-1-10.20) and formula (N-1-10.21). The compound represented by is preferable.

The compounds represented by the formulas (N-1-10.1), (N-1-10.2), (N-1-10.20) and (N-1-10.21) are used alone. However, the lower limit of the preferable content of these compounds alone or in combination with respect to the total amount of the liquid crystal composition is 5%, 10%, and 13 %, 15%, 17%, 20%. The upper limit of the preferable content is 35%, 30%, 28%, 25%, 23%, 20%, and 18% with respect to the total amount of the liquid crystal composition. Yes, 15%, 13%.

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

^{(Wherein, R N1111} and ^{R N1112} independently represents the same meaning as ^{R N11} and ^{R N12} in the general formula (N).)
^RN1111 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and preferably an ethyl group, a propyl group, a butyl group, a vinyl group or a 1-propenyl group. ^RN1112 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms, and preferably an ethoxy group, a propoxy group or a butoxy group.

The compound represented by the general formula (N-1-11) can be used alone, or two or more compounds can be used in combination. The types of compounds that can be combined are not particularly limited, but they are appropriately combined and used according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, three types, four types, and five or more types as one embodiment of the present invention.

When the improvement of Δε is emphasized, it is preferable to set the content high, when the solubility at low temperature is emphasized, the content is set low, and _{when the TNI} is emphasized, the content is high. The effect is high when is set high. Further, when improving the dripping marks and the seizure characteristics, it is preferable to set the content range in the middle.

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

Further, the compound represented by the general formula (N-1-11) is a compound selected from the compound group represented by the formulas (N-1-11.1) to (N-1-1.15). It is preferable that the compound is represented by the formulas (N-1-11.1) to (N-1-1.15), and the formula (N-1-11.2 and N- The compound represented by 1-11.4) is preferable.

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

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

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

The compound represented by the general formula (N-1-12) can be used alone, or two or more compounds can be used in combination. The types of compounds that can be combined are not particularly limited, but they are appropriately combined and used according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, three types, four types, and five or more types as one embodiment of the present invention.

When the improvement of Δε is emphasized, it is preferable to set the content high, when the solubility at low temperature is emphasized, the effect is high when the content is set high, and _{when the TNI} is emphasized, the content is set high. The effect is high when is set to a large extent. Further, when improving the dripping marks and the seizure characteristics, it is preferable to set the content range in the middle.

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

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

^{(Wherein, R N1131} and ^{R N1132} independently represents the same meaning as ^{R N11} and ^{R N12} in the general formula (N).)
^RN1131 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, preferably an ethyl group, a propyl group or a butyl group. ^RN1132 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and preferably an ethoxy group, a propoxy group, or a butoxy group.

The compound represented by the general formula (N-1-13) can be used alone, or two or more compounds can be used in combination. The types of compounds that can be combined are not particularly limited, but they are appropriately combined and used according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, three types, four types, and five or more types as one embodiment of the present invention.

When the improvement of Δε is emphasized, it is preferable to set the content high, when the solubility at low temperature is emphasized, the effect is high when the content is set high, and _{when the TNI} is emphasized, the content is set high. The effect is high when is set to a large extent. Further, when improving the dripping marks and the seizure characteristics, it is preferable to set the content range in the middle.

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

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

^{(Wherein, R N1141} and ^{R N1142} independently represents the same meaning as ^{R N11} and ^{R N12} in the general formula (N).)
^RN1141 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, preferably an ethyl group, a propyl group or a butyl group. ^RN1142 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms, and preferably an ethoxy group, a propoxy group or a butoxy group.

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

When the improvement of Δε is emphasized, it is preferable to set the content high, when the solubility at low temperature is emphasized, the effect is high when the content is set high, and _{when the TNI} is emphasized, the content is set high. The effect is high when is set to a large extent. Further, when improving the dripping marks and the seizure characteristics, it is preferable to set the content range in the middle.

The lower limit of the preferable content of the compound represented by the formula (N-1-14) with respect to the total amount of the liquid crystal composition is 5%, 10%, 13%, and 15%. , 17% and 20%. The upper limit of the preferable content is 35%, 30%, 28%, 25%, 23%, 20%, and 18% with respect to the total amount of the liquid crystal composition. Yes, 15%, 13%.

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

^{(Wherein, R N1151} and ^{R N1152} independently represents the same meaning as ^{R N11} and ^{R N12} in the general formula (N).)
^RN1151 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, preferably an ethyl group, a propyl group or a butyl group. ^RN1152 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and preferably an ethoxy group, a propoxy group, or a butoxy group.

The compound represented by the general formula (N-1-15) can be used alone, or two or more compounds can be used in combination. The types of compounds that can be combined are not particularly limited, but they are appropriately combined and used according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, three types, four types, and five or more types as one embodiment of the present invention.

When the improvement of Δε is emphasized, it is preferable to set the content high, when the solubility at low temperature is emphasized, the effect is high when the content is set high, and _{when the TNI} is emphasized, the content is set high. The effect is high when is set to a large extent. Further, when improving the dripping marks and the seizure characteristics, it is preferable to set the content range in the middle.

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

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

^{(Wherein, R N1161} and ^{R N1162} independently represents the same meaning as ^{R N11} and ^{R N12} in the general formula (N).)
^RN1161 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, preferably an ethyl group, a propyl group or a butyl group. ^RN1162 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and preferably an ethoxy group, a propoxy group, or a butoxy group.

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

When the improvement of Δε is emphasized, it is preferable to set the content high, when the solubility at low temperature is emphasized, the effect is high when the content is set high, and _{when the TNI} is emphasized, the content is set high. The effect is high when is set to a large extent. Further, when improving the dripping marks and the seizure characteristics, it is preferable to set the content range in the middle.

The lower limit of the preferable content of the compound represented by the formula (N-1-16) with respect to the total amount of the liquid crystal composition is 5%, 10%, 13%, and 15%. , 17% and 20%. The upper limit of the preferable content is 35%, 30%, 28%, 25%, 23%, 20%, and 18% with respect to the total amount of the liquid crystal composition. Yes, 15%, 13%.

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

^{(Wherein, R N1171} and ^{R N1172} independently represents the same meaning as ^{R N11} and ^{R N12} in the general formula (N).)
^RN1171 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, preferably an ethyl group, a propyl group or a butyl group. ^RN1172 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms, and preferably an ethoxy group, a propoxy group or a butoxy group.

The compound represented by the general formula (N-1-17) can be used alone, or two or more compounds can be used in combination. The types of compounds that can be combined are not particularly limited, but they are appropriately combined and used according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, three types, four types, and five or more types as one embodiment of the present invention.

When the improvement of Δε is emphasized, it is preferable to set the content high, when the solubility at low temperature is emphasized, the effect is high when the content is set high, and _{when the TNI} is emphasized, the content is set high. The effect is high when is set to a large extent. Further, when improving the dripping marks and the seizure characteristics, it is preferable to set the content range in the middle.

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

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

^{(Wherein, R N1181} and ^{R N1182} independently represents the same meaning as ^{R N11} and ^{R N12} in the general formula (N).)
^RN1181 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, preferably a methyl group, an ethyl group, a propyl group or a butyl group. ^RN1182 is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms, and preferably an ethoxy group, a propoxy group or a butoxy group.

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

When the improvement of Δε is emphasized, it is preferable to set the content high, when the solubility at low temperature is emphasized, the effect is high when the content is set high, and _{when the TNI} is emphasized, the content is set high. The effect is high when is set to a large extent. Further, when improving the dripping marks and the seizure characteristics, it is preferable to set the content range in the middle.

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

Further, the compound represented by the general formula (N-1-18) is a compound selected from the compound group represented by the formulas (N-1-18.1) to (N-1-18.5). It is preferable that the compound is represented by the formulas (N-1-18.1) to (N-1-11.3), and the compounds are preferably represented by the formulas (N-1-18.2) and (N-1-11.3). The compound represented by 1-18.3) is preferable.

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

^{(Wherein, R N1201} and ^{R N1202} independently represents the same meaning as ^{R N11} and ^{R N12} in the general formula (N).)
^RN1201 and ^RN1202 are each independently preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, preferably an ethyl group, a propyl group or a butyl group.

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

When the improvement of Δε is emphasized, it is preferable to set the content high, when the solubility at low temperature is emphasized, the effect is high when the content is set high, and _{when the TNI} is emphasized, the content is set high. The effect is high when is set to a large extent. Further, when improving the dripping marks and the seizure characteristics, it is preferable to set the content range in the middle.

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

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

^{(Wherein, R N1211} and ^{R N1212} independently represents the same meaning as ^{R N11} and ^{R N12} in the general formula (N).)
^RN1211 and ^RN1212 are each independently preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, preferably an ethyl group, a propyl group or a butyl group.

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

When the improvement of Δε is emphasized, it is preferable to set the content high, when the solubility at low temperature is emphasized, the effect is high when the content is set high, and _{when the TNI} is emphasized, the content is set high. The effect is high when is set to a large extent. Further, when improving the dripping marks and the seizure characteristics, it is preferable to set the content range in the middle.

The lower limit of the preferable content of the compound represented by the formula (N-1-21) with respect to the total amount of the liquid crystal composition is 5%, 10%, 13%, and 15%. , 17% and 20%. The upper limit of the preferable content is 35%, 30%, 28%, 25%, 23%, 20%, and 18% with respect to the total amount of the liquid crystal composition. Yes, 15%, 13%.

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

^{(Wherein, R N1221} and ^{R N1222} independently represents the same meaning as ^{R N11} and ^{R N12} in the general formula (N).)
^RN1221 and ^RN1222 are each independently preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, preferably an ethyl group, a propyl group or a butyl group.

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

When the improvement of Δε is emphasized, it is preferable to set the content high, when the solubility at low temperature is emphasized, the effect is high when the content is set high, and _{when the TNI} is emphasized, the content is set high. The effect is high when is set to a large extent. Further, when improving the dripping marks and the seizure characteristics, it is preferable to set the content range in the middle.

The lower limit of the preferable content of the compound represented by the formula (N-2-1) with respect to the total amount of the liquid crystal composition is 1%, 5%, 10%, and 13%. , 15%, 17% and 20%. The upper limit of the preferable content is 35%, 30%, 28%, 25%, 23%, 20%, and 18% with respect to the total amount of the liquid crystal composition. Yes, 15%, 13%, 10%, 5%.

Further, the compound represented by the general formula (N-1-22) is a compound selected from the compound group represented by the formulas (N-1-22.1) to (N-1-2.12.2). It is preferable that the compound is represented by the formulas (N-1-22.1) to (N-1-22.5), and the compounds are preferably represented by the formulas (N-1-22.1) to (N-). The compound represented by 1-22.4) is preferable.

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

^{(Wherein, R N321} and ^{R N322} each independently represents the same meaning as ^{R N11} and ^{R N12} in the general formula (N).)
^RN321 and ^RN322 are preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and preferably a propyl group or a pentyl group.

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

When the improvement of Δε is emphasized, it is preferable to set the content high, when the solubility at low temperature is emphasized, the effect is high when the content is set high, and _{when the TNI} is emphasized, the content is set high. The effect is high when set to a small value. Further, when improving the dripping marks and the seizure characteristics, it is preferable to set the content range in the middle.

The lower limit of the preferable content of the compound represented by the formula (N-3-2) with respect to the total amount of the liquid crystal composition is 3%, 5%, 10%, and 13%. , 15%, 17%, 20%, 23%, 25%, 27%, 30%, 33%, 35%. The upper limit of the preferable content is 50%, 40%, 38%, 35%, 33%, 30%, and 28% with respect to the total amount of the liquid crystal composition. Yes, 25%, 23%, 20%, 18%, 15%, 13%, 10%, 8%, 7%, 6% Yes, it is 5%.

Further, the compound represented by the general formula (N-3-2) is a compound selected from the compound group represented by the formulas (N-3-2.1) to (N-3-2.3). It is preferable to have.

The liquid crystal composition preferably contains one or more compounds represented by the general formula (J). These compounds are dielectrically positive compounds (Δε is greater than 2).

(In the formula, R ^J1 represents an alkyl group having 1 to 8 carbon atoms, and one or two or more non-adjacent −CH ₂ − in the alkyl group are independently −CH = CH−, −. It may be replaced by C≡C−, −O−, −CO−, −COO− or −OCO−.
n ^J1 represents 0, 1, 2, 3 or 4
A ^J1 , A ^J2 and A ^J3 are independent of each other.
(A) 1,4-cyclohexylene group (this is present in the group one -CH ₂ - or nonadjacent two or more -CH ₂ - may be replaced by -O-.)
(B) 1,4-phenylene group (one -CH = existing in this group or two or more -CH = not adjacent to each other may be replaced with -N =) and (c). Naphthalene-2,6-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or decahydronaphthalene-2,6-diyl group (naphthalene-2,6-diyl group or 1,2) , 3,4-Tetrahydronaphthalene-2,6-Diyl Group, one -CH = or two or more non-adjacent -CH = may be replaced with -N =).
Represents a group selected from the group consisting of, and the above groups (a), group (b) and group (c) are independently cyano groups, fluorine atoms, chlorine atoms, methyl groups, trifluoromethyl groups or trifluoro groups. It may be substituted with a methoxy group,
Z ^J1 and ^{Z J2} each independently represent a single _{bond, -CH 2 CH 2 -, -} (CH 2) 4 -, - OCH 2 -, - CH 2 O -, - OCF 2 -, - CF 2 O-, Represents -COO-, -OCO- or -C≡C-
When n ^J1 is 2, 3 or 4 and there ^{are a plurality of A J2s} , they may be the same or different, and when n ^J1 is 2, 3 or 4 and there are a plurality of ^{Z J1s.} If so, they may be the same or different,
^XJ1 represents a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, a trifluoromethyl group, a fluoromethoxy group, a difluoromethoxy group, a trifluoromethoxy group or a 2,2,2-trifluoroethyl group. )
In the general formula ^{(J), R J1} is an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, alkenyloxy of alkenyl or 2 to 8 carbon atoms having from 2 to 8 carbon atoms The group is preferable, an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkenyloxy group having 2 to 5 carbon atoms is preferable. Alkyl groups having 1 to 5 or alkoxy groups having 2 to 5 carbon atoms are more preferable, alkyl groups having 2 to 5 carbon atoms or alkoxy groups having 2 to 3 carbon atoms are more preferable, and alkoxy groups having 3 carbon atoms are more preferable. (Propenyl group) is particularly preferable.

Preferably R ^J1 is an alkyl group in the case of emphasizing reliability, it is preferred when emphasizing a reduction in viscosity is an alkenyl group.

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

The alkenyl group is preferably selected from the groups represented by any of the formulas (R1) to (R5). (The black dots in each formula represent carbon atoms in the ring structure to which the alkenyl group is bonded.)

A ^J1 , A ^J2 and A ^J3 are preferably aromatic when it is required to increase Δn independently, and are preferably aliphatic in order to improve the response rate, and trans-. 1,4-Cyclohexylene group, 1,4-phenylene group, 1,4-cyclohexenylene group, 1,4-bicyclo [2.2.2] octylene group, piperidine-1,4-diyl group, naphthalene It preferably represents a -2,6-diyl group, a decahydronaphthalene-2,6-diyl group or a 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, which are substituted with fluorine atoms. It may be preferable, and it is more preferable to represent the following structure.

It is more preferable to represent the following structure.

Z ^J1 and Z ^J2 independently represent -CH ₂ O-, -OCH _2- , -CF ₂ O-, -CH ₂ CH _2- , -CF ₂ CF _2- or single bond, respectively. OCH _2- , -CF ₂ O-, -CH ₂ CH _2- or single bond is more preferred, and -OCH _2- , -CF ₂ O- or single bond is particularly preferred.

^XJ1 is preferably a fluorine atom or a trifluoromethoxy group, preferably a fluorine atom.

n ^J1 is preferably 0, 1, 2 or 3, preferably 0, 1 or 2, preferably 0 or 1 when focusing on improvement of Δε, and preferably 1 or 2 when focusing on Tni. ..

The types of compounds that can be combined are not particularly limited, but they are used in combination according to desired performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, and three types as one embodiment of the present invention. Furthermore, in another embodiment of the present invention, there are four types, five types, six types, and seven or more types.

In the liquid crystal composition, the content of the compound represented by the general formula (J) includes solubility at low temperature, transition temperature, electrical reliability, birefringence, process compatibility, dripping marks, seizure, and dielectric constant. It is necessary to make appropriate adjustments according to the required performance such as anisotropy.

The lower limit of the preferable content of the compound represented by the general formula (J) with respect to the total amount of the liquid crystal composition is 1%, 10%, 20%, 30%, and 40%. , 50%, 55%, 60%, 65%, 70%, 75%, 80%. The preferred upper limit of the content is, for example, 95%, 85%, 75%, 65%, 55% in one embodiment of the present invention, based on the total amount of the liquid crystal composition. It is 45%, 35%, and 25%.

When a composition having a low viscosity and a high response speed is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when the Tni of the liquid crystal composition is kept high and a composition having good temperature stability is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when it is desired to increase the dielectric anisotropy in order to keep the drive voltage low, it is preferable to raise the above lower limit value and raise the upper limit value.

Preferably R ^J1 is an alkyl group in the case of emphasizing reliability, it is preferred when emphasizing a reduction in viscosity is an alkenyl group.

As the compound represented by the general formula (J), the compound represented by the general formula (M) and the compound represented by the general formula (K) are preferable.

The liquid crystal composition preferably contains one or more compounds represented by the general formula (M). These compounds are dielectrically positive compounds (Δε is greater than 2).

^{(Wherein, R M1} represents an alkyl group having 1 to 8 carbon atoms, one or non-adjacent two or more -CH ₂ in the alkyl group - are each independently -CH = CH -, - It may be replaced by C≡C−, −O−, −CO−, −COO− or −OCO−.
n ^M1 represents 0, 1, 2, 3 or 4
^AM1 and ^AM2 are independent of each other
(A) 1,4-cyclohexylene group (this is present in the group one -CH ₂ - or nonadjacent two or more -CH ₂ - may be replaced by -O- or -S- (May be) and (b) 1,4-phenylene group (one -CH = existing in this group or two or more -CH = not adjacent to each other may be replaced with -N =).
Represents a group selected from the group consisting of, and the hydrogen atoms on the above groups (a) and (b) may be independently substituted with cyano groups, fluorine atoms or chlorine atoms, respectively.
Z ^M1 and ^{Z M2} each independently represent a single _{bond, -CH 2 CH 2 -, -} (CH 2) 4 -, - OCH 2 -, - CH 2 O -, - OCF 2 -, - CF 2 O-, Represents −COO−, −OCO− or −C≡C−
When n ^M1 is 2, 3 or 4 and there ^{are a plurality of A M2s} , they may be the same or different, and when n ^M1 is 2, 3 or 4 and there are a plurality of ^{Z M1s.} If so, they may be the same or different,
X ^M1 and X ^M3 independently represent a hydrogen atom, a chlorine atom or a fluorine atom, respectively.
X ^M2 represents a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, a trifluoromethyl group, a fluoromethoxy group, a difluoromethoxy group, a trifluoromethoxy group or a 2,2,2-trifluoroethyl group.

In the general formula (M), ^RM1 is an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, or an alkenyloxy having 2 to 8 carbon atoms. The group is preferable, an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkenyloxy group having 2 to 5 carbon atoms is preferable. Alkyl groups having 1 to 5 or alkoxy groups having 2 to 5 carbon atoms are more preferable, alkyl groups having 2 to 5 carbon atoms or alkoxy groups having 2 to 3 carbon atoms are more preferable, and alkoxy groups having 3 carbon atoms are more preferable. (Propenyl group) is particularly preferable.

Preferably R ^M1 is an alkyl group in the case of emphasizing reliability, it is preferred when emphasizing a reduction in viscosity is an alkenyl group.

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

The alkenyl group is preferably selected from the groups represented by any of the formulas (R1) to (R5). (The black dots in each formula represent carbon atoms in the ring structure to which the alkenyl group is bonded.)

Preferably when it is desired A ^M1 and A ^M2 is to increase the Δn each independently is an aromatic, preferably to improve the response speed is an aliphatic, trans-1,4 -Cyclohexylene group, 1,4-phenylene group, 2-fluoro-1,4-phenylene group, 3-fluoro-1,4-phenylene group, 3,5-difluoro-1,4-phenylene group, 2, 3-Difluoro-1,4-phenylene group, 1,4-cyclohexenylene group, 1,4-bicyclo [2.2.2] octylene group, piperidine-1,4-diyl group, naphthalene-2,6- It is preferable to represent a diyl group, a decahydronaphthalene-2,6-diyl group or a 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, and more preferably to represent the following structure.

It is more preferable to represent the following structure.

Z ^M1 and ^{Z M2} each _{independently -CH 2 O -, - CF 2} O -, - CH 2 CH 2 -, - CF 2 CF 2 - or preferably a single bond, _-CF 2 O-, -CH ₂ CH _2- or single bond is more preferred, and -CF ₂ O- or single bond is particularly preferred.

n ^M1 is preferably 0, 1, 2 or 3, preferably 0, 1 or 2, preferably 0 or 1 when focusing on improvement of Δε, and preferably 1 or 2 when focusing on Tni. ..

The types of compounds that can be combined are not particularly limited, but they are used in combination according to desired performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, and three types as one embodiment of the present invention. Furthermore, in another embodiment of the present invention, there are four types, five types, six types, and seven or more types.

In the liquid crystal composition, the content of the compound represented by the general formula (M) includes solubility at low temperature, transition temperature, electrical reliability, birefringence, process compatibility, dripping marks, seizure, and dielectric constant. It is necessary to make appropriate adjustments according to the required performance such as anisotropy.

The lower limit of the preferable content of the compound represented by the formula (M) with respect to the total amount of the liquid crystal composition is 1%, 10%, 20%, 30%, and 40%. Yes, 50%, 55%, 60%, 65%, 70%, 75%, 80%. The preferred upper limit of the content is, for example, 95%, 85%, 75%, 65%, 55% in one embodiment of the present invention, based on the total amount of the liquid crystal composition. It is 45%, 35%, and 25%.

When a composition having a low viscosity and a high response speed is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when the Tni of the liquid crystal composition is kept high and a composition having good temperature stability is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when it is desired to increase the dielectric anisotropy in order to keep the drive voltage low, it is preferable to raise the above lower limit value and raise the upper limit value.

The compound represented by the general formula (M) is preferably a compound selected from the compound group represented by the general formula (M-1), for example.

(In the formula, ^RM11 represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and X ^M11 to X ^M15 are independently hydrogens. Represents an atom or a fluorine atom, and Y ^M11 represents a fluorine atom or an OCI _3.)
The types of compounds that can be combined are not particularly limited, but they are used in combination according to desired performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, and three or more types as one embodiment of the present invention.

The lower limit of the preferable content of the compound represented by the formula (M-1) with respect to the total amount of the liquid crystal composition is 1%, 2%, 5%, 8%, and 10%. %, 13%, 15%, 18%, 20%, 22%, 25%, 30%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

When a composition having a low viscosity and a high response speed is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when the Tni of the liquid crystal composition is kept high and a composition having good temperature stability is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when it is desired to increase the dielectric anisotropy in order to keep the drive voltage low, it is preferable to raise the above lower limit value and raise the upper limit value.

Further, the compound represented by the general formula (M-1) is preferably a compound represented by the formulas (M-1.1) to (M-1.4), and the formula (M-1) is preferable. The compound represented by M-1.1) or the formula (M-1.2) is preferable, and the compound represented by the formula (M-1.2) is more preferable. It is also preferable to use the compounds represented by the formula (M-1.1) or the formula (M-1.2) at the same time.

The lower limit of the preferable content of the compound represented by the formula (M-1.1) with respect to the total amount of the liquid crystal composition is 1%, 2%, 5%, and 6%. .. The preferred upper limit of the content is 15%, 13%, 10%, 8% and 5%.

The lower limit of the preferable content of the compound represented by the formula (M-1.2) with respect to the total amount of the liquid crystal composition is 1%, 2%, 5%, and 6%. .. The preferred upper limit of content is 30%, 25%, 23%, 20%, 18%, 15%, 13%, 10%, 8%. Is.

The lower limit of the total preferable content of the compounds represented by the formulas (M-1.1) and (M-1.2) with respect to the total amount of the liquid crystal composition is 1%, which is 2%. Yes, 5%, 6%. The preferred upper limit of content is 30%, 25%, 23%, 20%, 18%, 15%, 13%, 10%, 8%. Is.

Further, the compound represented by the general formula (M) is preferably a compound selected from the compound group represented by the general formula (M-2), for example.

(In the formula, ^RM21 represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and X ^M21 and X ^M22 are independently hydrogens. Represents an ^{atom or a fluorine atom, where Y M21} represents a fluorine atom, a chlorine atom or an OCI _3.)
The lower limit of the preferable content of the compound represented by the formula (M-1) with respect to the total amount of the liquid crystal composition is 1%, 2%, 5%, 8%, and 10%. %, 13%, 15%, 18%, 20%, 22%, 25%, 30%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

When a composition having a low viscosity and a high response speed is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when a composition that keeps the Tni of the liquid crystal composition high and is less likely to cause seizure is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when it is desired to increase the dielectric anisotropy in order to keep the drive voltage low, it is preferable to raise the above lower limit value and raise the upper limit value.

Further, the compound represented by the general formula (M-2) is preferably a compound represented by the formulas (M-2.1) to (M-2.5), and the compound represented by the formula (M-2. It is preferably a compound represented by 3) or / and the formula (M-2.5).

The lower limit of the preferable content of the compound represented by the formula (M-2.2) with respect to the total amount of the liquid crystal composition is 1%, 2%, 5%, and 6%. .. The preferred upper limit of the content is 15%, 13%, 10%, 8% and 5%.

The lower limit of the preferable content of the compound represented by the formula (M-2.3) with respect to the total amount of the liquid crystal composition is 1%, 2%, 5%, and 6%. .. The preferred upper limit of content is 30%, 25%, 23%, 20%, 18%, 15%, 13%, 10%, 8%. Is.

The lower limit of the preferable content of the compound represented by the formula (M-2.5) with respect to the total amount of the liquid crystal composition is 1%, 2%, 5%, and 6%. .. The preferred upper limit of content is 30%, 25%, 23%, 20%, 18%, 15%, 13%, 10%, 8%. Is.

The lower limit of the preferred total content of the compounds represented by the formulas (M-2.2), (M-2.3) and (M-2.5) with respect to the total amount of the liquid crystal composition is It is 1%, 2%, 5%, and 6%. The preferred upper limit of content is 30%, 25%, 23%, 20%, 18%, 15%, 13%, 10%, 8%. Is.

The content is preferably 1% or more, more preferably 5% or more, further preferably 8% or more, further preferably 10% or more, further preferably 14% or more, 16%, based on the total amount of the liquid crystal composition. % Or more is particularly preferable. Further, in consideration of solubility at low temperature, transition temperature, electrical reliability, etc., the maximum ratio is preferably kept at 30% or less, more preferably 25% or less, more preferably 22% or less, and 20%. Less than is particularly preferred.

The compound represented by the general formula (M) used in the liquid crystal composition is preferably a compound represented by the general formula (M-3).

(In the formula, ^RM31 represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and X ^M31 to X ^M36 are independently hydrogens. Represents an ^{atom or a fluorine atom, where Y M31} represents a fluorine atom, a chlorine atom or an OCI _3.)
The compounds that can be combined are not particularly limited, but it is preferable to combine one to two or more in consideration of solubility at low temperature, transition temperature, electrical reliability, birefringence and the like.

The content of the compound represented by the general formula (M-3) is an upper limit value and a lower limit value for each embodiment in consideration of characteristics such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. There is a value.

The lower limit of the preferable content of the compound represented by the formula (M-3) with respect to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%, and 8%. %, 10%, 13%, 15%, 18%, 20%. The preferred upper limit of the content is 20%, 18%, 15%, 13%, 10%, 8% and 5%.

Further, the compound represented by the general formula (M-3) used in the liquid crystal composition is specifically a compound represented by the formulas (M-3.1) to (M-3.8). It is preferable to contain a compound represented by the formula (M-3.1) and / or the formula (M-3.2).

The lower limit of the preferable content of the compound represented by the formula (M-3.1) with respect to the total amount of the liquid crystal composition is 1%, 2%, 4%, and 5%. , 8%, 10%, 13%, 15%, 18%, 20%. The preferred upper limit of the content is 20%, 18%, 15%, 13%, 10%, 8% and 5%.

The lower limit of the preferable content of the compound represented by the formula (M-3.2) with respect to the total amount of the liquid crystal composition is 1%, 2%, 4%, and 5%. , 8%, 10%, 13%, 15%, 18%, 20%. The preferred upper limit of the content is 20%, 18%, 15%, 13%, 10%, 8% and 5%.

The lower limit of the total preferable content of the compounds represented by the formulas (M-3.1) and (M-3.2) with respect to the total amount of the liquid crystal composition is 1%, which is 2%. Yes, 4%, 5%, 8%, 10%, 13%, 15%, 18%, 20%. The preferred upper limit of the content is 20%, 18%, 15%, 13%, 10%, 8% and 5%.

Further, the compound represented by the general formula (M) is preferably a compound selected from the group represented by the general formula (M-4).

(In the formula, ^RM41 represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and X ^M41 to X ^M48 are independently fluorine. Represents an atom or a hydrogen atom, where Y ^M41 represents a fluorine atom, a chlorine atom or an OCI _3.)
The compounds that can be combined are not particularly limited, but it is preferable to combine one, two, or three or more in consideration of solubility at low temperature, transition temperature, electrical reliability, birefringence, and the like.

The content of the compound represented by the general formula (M-4) is an upper limit value and a lower limit value for each embodiment in consideration of characteristics such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. There is a value.

The lower limit of the preferable content of the compound represented by the formula (M-4) with respect to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%, and 8%. %, 10%, 13%, 15%, 18%, 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

When the liquid crystal composition is used for a liquid crystal display element having a small cell gap, it is suitable to increase the content of the compound represented by the general formula (M-4). When used for a liquid crystal display element having a small drive voltage, it is suitable to increase the content of the compound represented by the general formula (M-4). Further, when used for a liquid crystal display element used in a low temperature environment, it is suitable to reduce the content of the compound represented by the general formula (M-4). When the composition is used for a liquid crystal display device having a high response speed, it is suitable to reduce the content of the compound represented by the general formula (M-4).

Further, the compound represented by the general formula (M-4) used in the liquid crystal composition is specifically a compound represented by the formulas (M-4.1) to (M-4.4). It is preferable that the compound represented by the formulas (M-4.2) to (M-4.4) is contained, and the compound represented by the formula (M-4.2) is contained. It is more preferable to do so.

Further, the compound represented by the general formula (M) is preferably a compound represented by the general formula (M-5).

(In the formula, ^RM51 represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and X ^M51 and X ^{M 52} are independently hydrogens. Represents an ^{atom or a fluorine atom, where Y M51} represents a fluorine atom, a chlorine atom or an OCI _3.)
The types of compounds that can be combined are not limited, but they are appropriately combined and used for each embodiment in consideration of solubility at low temperature, transition temperature, electrical reliability, birefringence, and the like. For example, one embodiment of the present invention has one type, another embodiment has two types, yet another embodiment has three types, yet another embodiment has four types, and yet another embodiment has five types. In yet another embodiment, six or more types are combined.

The lower limit of the preferable content of the compound represented by the formula (M-5) with respect to the total amount of the liquid crystal composition is 1%, 2%, 5%, 8%, and 10%. %, 13%, 15%, 18%, 20%, 22%, 25%, 30%. The preferred upper limit of content is 50%, 45%, 40%, 35%, 33%, 30%, 28%, 25%, 23%. , 20%, 18%, 15%, 13%, 10%, 8%, 5%.

When a composition having a low viscosity and a high response speed is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when a composition that keeps the Tni of the liquid crystal composition high and is less likely to cause seizure is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when it is desired to increase the dielectric anisotropy in order to keep the drive voltage low, it is preferable to raise the above lower limit value and raise the upper limit value.

Further, the compound represented by the general formula (M-5) is preferably a compound represented by the formulas (M-5.1) to (M-5.4), and the compound represented by the formula (M-5. It is preferable that the compound is represented by the formula (M-5.4) from 1).

The lower limit of the preferred content of these compounds relative to the total amount of the liquid crystal composition is 1%, 2%, 5%, 8%, 10%, 13%. It is 15%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

Further, the compound represented by the general formula (M-5) is preferably a compound represented by the formulas (M-5.11) to (M-5.17), and the compound represented by the formula (M-5.17) is preferable. 11), the compound represented by the formula (M-5.13) and the formula (M-5.17) is preferable.

The lower limit of the preferred content of these compounds relative to the total amount of the liquid crystal composition is 1%, 2%, 5%, 8%, 10%, 13%. It is 15%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

Further, the compound represented by the general formula (M-5) is preferably a compound represented by the formulas (M-5.21) to (M-5.28), and the compound represented by the formula (M-5. 21), the compound represented by the formula (M-5.22), the formula (M-5.23) and the formula (M-5.25) is preferable.

The lower limit of the preferred content of these compounds relative to the total amount of the liquid crystal composition is 1%, 2%, 5%, 8%, 10%, 13%. It is 15%, 18%, 20%, 22%, 25%, and 30%. The preferred upper limit of content is 40%, 35%, 33%, 30%, 28%, 25%, 23%, 20%, 18%. , 15%, 13%, 10%, 8%, 5%.

Further, the compound represented by the general formula (M) is preferably a compound represented by the general formula (M-6).

(In the formula, ^RM61 represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and X ^M61 to X ^M64 are independently fluorine. Represents an atom or a hydrogen atom, where Y ^M61 represents a fluorine atom, a chlorine atom or an OCI _3.)
There is no limitation on the types of compounds that can be combined, but they are appropriately combined for each embodiment in consideration of solubility at low temperature, transition temperature, electrical reliability, birefringence, and the like.

The lower limit of the preferable content of the compound represented by the formula (M-6) with respect to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%, and 8%. %, 10%, 13%, 15%, 18%, 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

When the liquid crystal composition is used for a liquid crystal display element having a small driving voltage, it is suitable to increase the content of the compound represented by the general formula (M-6). Further, in the case of a composition used for a liquid crystal display element having a high response speed, it is suitable to reduce the content of the compound represented by the general formula (M-6).

Further, the compound represented by the general formula (M-6) is preferably a compound represented by the formulas (M-6.1) to (M-6.4), and above all, the compound represented by the formula (M-6). It is preferable to contain a compound represented by M-6.2) and the formula (M-6.4).

The lower limit of the preferred content of these compounds relative to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%, 8%, 10%. It is 13%, 15%, 18%, and 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

Further, the compound represented by the general formula (M-6) is preferably a compound represented by the formulas (M-6.11) to (M-6.14), and above all, the compound represented by the formula (M-6.14). It is preferable to contain a compound represented by M-6.12) and the formula (M-6.14).

The lower limit of the preferred content of these compounds relative to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%, 8%, 10%. It is 13%, 15%, 18%, and 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

Further, the compound represented by the general formula (M-6) is preferably a compound represented by the formulas (M-6.21) to (M-6.24), and above all, the compound represented by the formula (M-6.24). It is preferable to contain the compounds represented by M-6.21), the formula (M-6.22) and the formula (M-6.24).

The lower limit of the preferred content of these compounds relative to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%, 8%, 10%. It is 13%, 15%, 18%, and 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

Further, the compound represented by the general formula (M-6) is preferably a compound represented by the formulas (M-6.31) to (M-6.34). Among them, it is preferable to contain the compounds represented by the formulas (M-6.31) and (M-6.32).

The lower limit of the preferred content of these compounds relative to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%, 8%, 10%. It is 13%, 15%, 18%, and 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

Further, the compound represented by the general formula (M-6) is preferably a compound represented by the formulas (M-6.41) to (M-6.44), and above all, the compound represented by the formula (M-6.44) is preferable. It is preferable to contain the compound represented by M-6.42).

The lower limit of the preferred content of these compounds relative to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%, 8%, 10%. It is 13%, 15%, 18%, and 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

Further, the compound represented by the general formula (M) is preferably a compound selected from the compound group represented by the general formula (M-7).

(In the formula, X ^M71 to X ^M76 independently represent a fluorine atom or a hydrogen atom, and ^RM71 is an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 2 to 5 carbon atoms, or 1 to 1 carbon atoms. Represents an alkoxy group of 4, and Y ^M71 represents a hydrogen atom or OCF _3.)
The types of compounds that can be combined are not particularly limited, but it is preferable to contain 1 to 2 types of these compounds, more preferably 1 to 3 types, and 1 to 4 types to be contained. Is even more preferable.

The content of the compound represented by the general formula (M-7) is an upper limit value and a lower limit value for each embodiment in consideration of characteristics such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. There is a value.

The lower limit of the preferable content of the compound represented by the formula (M-7) with respect to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%, and 8%. %, 10%, 13%, 15%, 18%, 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

When the liquid crystal composition is used for a liquid crystal display element having a small cell gap, it is suitable to increase the content of the compound represented by the general formula (M-7). When used for a liquid crystal display element having a small drive voltage, it is suitable to increase the content of the compound represented by the general formula (M-7). Further, when it is used for a liquid crystal display element used in a low temperature environment, it is suitable to reduce the content of the compound represented by the general formula (M-7). When the composition is used for a liquid crystal display device having a high response speed, it is suitable to reduce the content of the compound represented by the general formula (M-7).

Further, the compound represented by the general formula (M-7) is preferably a compound represented by the formulas (M-7.1) to (M-7.4), and the compound represented by the formula (M-7. It is preferably a compound represented by 2).

The lower limit of the preferred content of these compounds relative to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%, 8%, 10%. It is 13%, 15%, 18%, and 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

Further, the compound represented by the general formula (M-7) is preferably a compound represented by the formulas (M-7.11) to (M-7.14), and the compound represented by the formula (M-7. 11) and the compound represented by the formula (M-7.12) are preferable.

The lower limit of the preferred content of these compounds relative to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%, 8%, 10%. It is 13%, 15%, 18%, and 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

Further, the compound represented by the general formula (M-7) is preferably a compound represented by the formulas (M-7.21) to (M-7.24), and the compound represented by the formula (M-7. It is preferably a compound represented by 21) and the formula (M-7.22).

The lower limit of the preferred content of these compounds relative to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%, 8%, 10%. It is 13%, 15%, 18%, and 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

Further, the compound represented by the general formula (M) is preferably a compound represented by the general formula (M-8).

(In the formula, X ^M81 to X ^M84 independently represent a fluorine atom or a hydrogen atom, Y ^M81 represents a fluorine atom, a chlorine atom or −OCF ₃ , and ^RM81 is an alkyl group having 1 to 5 carbon atoms. Represents an alkenyl group having 2 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms, and ^{AM81 and AM82} are independently 1,4-cyclohexylene groups, 1,4-phenylene groups or

However, the hydrogen atom on the 1,4-phenylene group may be substituted with a fluorine atom. )
The lower limit of the preferable content of the compound represented by the general formula (M-8) with respect to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%. It is 8%, 10%, 13%, 15%, 18%, and 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

When a composition having a low viscosity and a high response speed is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when a composition in which seizure is unlikely to occur is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when it is desired to increase the dielectric anisotropy in order to keep the drive voltage low, it is preferable to raise the above lower limit value and raise the upper limit value.

Further, the compound represented by the general formula (M-8) used in the liquid crystal composition is specifically a compound represented by the formulas (M-8.1) to (M-8.4). It is preferable to contain a compound represented by the formula (M-8.1) and the formula (M-8.2).

The lower limit of the preferred content of these compounds relative to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%, 8%, 10%. It is 13%, 15%, 18%, and 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

Further, the compound represented by the general formula (M-8) used in the liquid crystal composition is specifically a compound represented by the formulas (M-8.11) to (M-8.14). It is preferable to contain a compound represented by the formula (M-8.12).

The lower limit of the preferred content of these compounds relative to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%, 8%, 10%. It is 13%, 15%, 18%, and 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

Further, the compound represented by the general formula (M-8) used in the liquid crystal composition is specifically a compound represented by the formulas (M-8.21) to (M-8.24). It is preferable to contain a compound represented by the formula (M-8.22).

The lower limit of the preferred content of these compounds relative to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%, 8%, 10%. It is 13%, 15%, 18%, and 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

Further, the compound represented by the general formula (M-8) used in the liquid crystal composition is specifically a compound represented by the formulas (M-8.31) to (M-8.34). It is preferable to contain a compound represented by the formula (M-8.32).

The lower limit of the preferred content of these compounds relative to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%, 8%, 10%. It is 13%, 15%, 18%, and 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

Further, the compound represented by the general formula (M-8) used in the liquid crystal composition is specifically a compound represented by the formulas (M-8.41) to (M-8.44). It is preferable to contain a compound represented by the formula (M-8.42).

The lower limit of the preferred content of these compounds relative to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%, 8%, 10%. It is 13%, 15%, 18%, and 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

Further, the compound represented by the general formula (M-8) used in the liquid crystal composition is specifically a compound represented by the formulas (M-8.51) to (M-8.54). It is preferable to contain a compound represented by the formula (M-8.52).

The lower limit of the preferred content of these compounds relative to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%, 8%, 10%. It is 13%, 15%, 18%, and 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

Further, the compound represented by the general formula (M) may have the following partial structure in its structure.

(The black dots in the formula represent carbon atoms in the ring structure to which the above partial structures are bonded.)
As the compound having the above partial structure, it is preferable that the compound is represented by the general formulas (M-10) to (M-18).

The compound represented by the general formula (M-10) is as follows.

(In the formula, X ^M101 and X ^M102 independently represent a fluorine atom or a hydrogen atom, Y ^M101 represents a fluorine atom, a chlorine atom or −OCF ₃ , and ^RM101 is an alkyl group having 1 to 5 carbon atoms. Represents an alkenyl group having 2 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms, and ^{WM101 and WM102} independently _{represent -CH 2-} or -O-).
The lower limit of the preferable content of the compound represented by the general formula (M-10) with respect to the total amount of the liquid crystal composition is 1%, 2%, 4%, and 5%. It is 8%, 10%, 13%, 15%, 18%, and 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

When a composition having a low viscosity and a high response speed is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when a composition in which seizure is unlikely to occur is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when it is desired to increase the dielectric anisotropy in order to keep the drive voltage low, it is preferable to raise the above lower limit value and raise the upper limit value.

Further, the compound represented by the general formula (M-10) used in the liquid crystal composition is specifically a compound represented by the formulas (M-10.12) to (M-10.12). It is preferable to contain a compound represented by the formulas (M-10.52) to (M-10.12).

The lower limit of the preferred content of these compounds relative to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%, 8%, 10%. It is 13%, 15%, 18%, and 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

The compound represented by the general formula (M-11) is as follows.

(In the formula, X ^{M111 to} X ^M114 independently represent a fluorine atom or a hydrogen atom, Y ^M111 represents a fluorine atom, a chlorine atom or −OCF ₃ , and ^RM111 is an alkyl group having 1 to 5 carbon atoms. Represents an alkenyl group having 2 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms.)
The lower limit of the preferable content of the compound represented by the general formula (M-11) with respect to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%. It is 8%, 10%, 13%, 15%, 18%, and 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

When a composition having a low viscosity and a high response speed is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when a composition in which seizure is unlikely to occur is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when it is desired to increase the dielectric anisotropy in order to keep the drive voltage low, it is preferable to raise the above lower limit value and raise the upper limit value.

Further, the compound represented by the general formula (M-11) used in the liquid crystal composition is specifically a compound represented by the formulas (M-11.1) to (M-11.8). It is preferable to contain a compound represented by the formulas (M-11.1) to (M-11.4).

The lower limit of the preferred content of these compounds relative to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%, 8%, 10%. It is 13%, 15%, 18%, and 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

The compound represented by the general formula (M-12) is as follows.

(In the formula, X ^M121 and X ^M122 independently represent a fluorine atom or a hydrogen atom, Y ^M121 represents a fluorine atom, a chlorine atom or −OCF ₃ , and ^RM121 is an alkyl group having 1 to 5 carbon atoms. an alkenyl group or an alkoxy group having 1 to 4 carbon atoms 2 to 5 carbon ^{atoms, W M121} and ^{W M122} are each independently, -CH ₂ - represents a or -O-).
The lower limit of the preferable content of the compound represented by the general formula (M-12) with respect to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%. It is 8%, 10%, 13%, 15%, 18%, and 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

When a composition having a low viscosity and a high response speed is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when a composition in which seizure is unlikely to occur is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when it is desired to increase the dielectric anisotropy in order to keep the drive voltage low, it is preferable to raise the above lower limit value and raise the upper limit value.

Further, the compound represented by the general formula (M-12) used in the liquid crystal composition is specifically a compound represented by the formulas (M-12.12) to (M-12.12). It is preferable to contain a compound represented by the formulas (M-12.5) to (M-12.8).

The lower limit of the preferred content of these compounds relative to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%, 8%, 10%. It is 13%, 15%, 18%, and 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

The compound represented by the general formula (M-13) is as follows.

(In the formula, X ^{M131 to} X ^M134 independently represent a fluorine atom or a hydrogen atom, Y ^M131 represents a fluorine atom, a chlorine atom or −OCF ₃ , and ^RM131 represents an alkyl group having 1 to 5 carbon atoms. an alkenyl group or an alkoxy group having 1 to 4 carbon atoms 2 to 5 carbon ^{atoms, W M131} and ^{W M132} are each independently, -CH ₂ - represents a or -O-).
The lower limit of the preferable content of the compound represented by the general formula (M-13) with respect to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%. It is 8%, 10%, 13%, 15%, 18%, and 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

When a composition having a low viscosity and a high response speed is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when a composition in which seizure is unlikely to occur is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when it is desired to increase the dielectric anisotropy in order to keep the drive voltage low, it is preferable to raise the above lower limit value and raise the upper limit value.

Further, the compound represented by the general formula (M-13) used in the liquid crystal composition is specifically a compound represented by the formulas (M-13.1) to (M-13.28). Among them, the formulas (M-13.1) to (M-13.4), (M-13.11) to (M-13.14), and (M-13.25) to (M-) are preferable. It preferably contains the compound represented by 13.28).

The lower limit of the preferred content of these compounds relative to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%, 8%, 10%. It is 13%, 15%, 18%, and 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

The compound represented by the general formula (M-14) is as follows.

(In the formula, X ^{M141 to} X ^M144 independently represent a fluorine atom or a hydrogen atom, Y ^M141 represents a fluorine atom, a chlorine atom or −OCF ₃ , and ^RM141 is an alkyl group having 1 to 5 carbon atoms. an alkenyl group or an alkoxy group having 1 to 4 carbon atoms 2 to 5 carbon ^{atoms, W M 141} and ^{W M142} are each independently, -CH ₂ - represents a or -O-).
The lower limit of the preferable content of the compound represented by the general formula (M-14) with respect to the total amount of the liquid crystal composition is 1%, 2%, 4%, and 5%. 8%, 10%, 13%, 15%, 18%, 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

When a composition having a low viscosity and a high response speed is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when a composition in which seizure is unlikely to occur is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when it is desired to increase the dielectric anisotropy in order to keep the drive voltage low, it is preferable to raise the above lower limit value and raise the upper limit value.

Further, the compound represented by the general formula (M-14) used in the liquid crystal composition is specifically a compound represented by the formulas (M-14.1) to (M-14.8). It is preferable to contain a compound represented by the formula (M-14.5) and the formula (M-14.8).

The lower limit of the preferred content of these compounds relative to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%, 8%, 10%. It is 13%, 15%, 18%, and 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

The compound represented by the general formula (M-15) is as follows.

(In the formula, X ^M151 and X ^M152 independently represent a fluorine atom or a hydrogen atom, Y ^M151 represents a fluorine atom, a chlorine atom or −OCF ₃ , and ^RM151 is an alkyl group having 1 to 5 carbon atoms. an alkenyl group or an alkoxy group having 1 to 4 carbon atoms 2 to 5 carbon ^{atoms, W M151} and ^{W M152} are each independently, -CH ₂ - represents a or -O-).
The lower limit of the preferable content of the compound represented by the general formula (M-15) with respect to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%. It is 8%, 10%, 13%, 15%, 18%, and 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

When a composition having a low viscosity and a high response speed is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when a composition in which seizure is unlikely to occur is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when it is desired to increase the dielectric anisotropy in order to keep the drive voltage low, it is preferable to raise the above lower limit value and raise the upper limit value.

Further, the compound represented by the general formula (M-15) used in the liquid crystal composition is specifically a compound represented by the formulas (M-15.1) to (M-15.14). It preferably contains compounds represented by formulas (M-15.5) to (M-15.8) and formulas (M-15.11) to (M-15.14). Is preferable.

The lower limit of the preferred content of these compounds relative to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%, 8%, 10%. It is 13%, 15%, 18%, and 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

The compound represented by the general formula (M-16) is as follows.

(In the formula, X ^{M161 to} X ^M164 independently represent a fluorine atom or a hydrogen atom, Y ^M161 represents a fluorine atom, a chlorine atom or −OCF ₃ , and ^RM161 is an alkyl group having 1 to 5 carbon atoms. Represents an alkenyl group having 2 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms.)
The lower limit of the preferable content of the compound represented by the general formula (M-16) with respect to the total amount of the liquid crystal composition is 1%, 2%, 4%, and 5%. 8%, 10%, 13%, 15%, 18%, 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

When a composition having a low viscosity and a high response speed is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when a composition in which seizure is unlikely to occur is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when it is desired to increase the dielectric anisotropy in order to keep the drive voltage low, it is preferable to raise the above lower limit value and raise the upper limit value.

Further, the compound represented by the general formula (M-16) used in the liquid crystal composition is specifically a compound represented by the formulas (M-16.1) to (M-16.8). It is preferable to contain a compound represented by the formulas (M-16.1) to (M-16.4).

The lower limit of the preferred content of these compounds relative to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%, 8%, 10%. It is 13%, 15%, 18%, and 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

The compound represented by the general formula (M-17) is as follows.

^{(Wherein, X M171 ~X M174} independently represents a fluorine atom or a hydrogen ^{atom, Y M171} fluorine atom, a chlorine atom or -OCF ^{_3, R M171} is an alkyl group having 1 to 5 carbon atoms, an alkenyl group or an alkoxy group having 1 to 4 carbon atoms 2 to 5 carbon ^{atoms, W M171} and ^{W M172} are each independently, -CH ₂ - represents a or -O-).
The lower limit of the preferable content of the compound represented by the general formula (M-17) with respect to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%. It is 8%, 10%, 13%, 15%, 18%, and 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

When a composition having a low viscosity and a high response speed is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when a composition in which seizure is unlikely to occur is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when it is desired to increase the dielectric anisotropy in order to keep the drive voltage low, it is preferable to raise the above lower limit value and raise the upper limit value.

Further, the compound represented by the general formula (M-17) used in the liquid crystal composition is specifically a compound represented by the formulas (M-17.1) to (M-17.52). Among them, the formulas (M-17.9) to (M-17.12), the formulas (M-17.21) to the formulas (M-17.28), and the formulas (M-17.45) are preferable. It is preferable to contain a compound represented by the formula (M-17.48).

The lower limit of the preferred content of these compounds relative to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%, 8%, 10%. It is 13%, 15%, 18%, and 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

The compound represented by the general formula (M-18) is as follows.

(In the formula, X ^{M181 to} X ^M186 independently represent a fluorine atom or a hydrogen atom, Y ^M181 represents a fluorine atom, a chlorine atom or −OCF ₃ , and ^RM181 is an alkyl group having 1 to 5 carbon atoms. Represents an alkenyl group having 2 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms.)
The lower limit of the preferable content of the compound represented by the general formula (M-18) with respect to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%. It is 8%, 10%, 13%, 15%, 18%, and 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

When a composition having a low viscosity and a high response speed is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when a composition in which seizure is unlikely to occur is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when it is desired to increase the dielectric anisotropy in order to keep the drive voltage low, it is preferable to raise the above lower limit value and raise the upper limit value.

Further, the compound represented by the general formula (M-18) used in the liquid crystal composition is specifically a compound represented by the formulas (M-18.1) to (M-18.12). It is preferable to contain a compound represented by the formulas (M-18.5) to (M-18.8).

The lower limit of the preferred content of these compounds relative to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%, 8%, 10%. It is 13%, 15%, 18%, and 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

The liquid crystal composition preferably contains one or more compounds represented by the general formula (K). These compounds are dielectrically positive compounds (Δε is greater than 2).

(In the formula, ^RK1 represents an alkyl group having 1 to 8 carbon atoms, and one or two or more non-adjacent −CH ₂ −s in the alkyl group are independently −CH = CH−, −. It may be replaced by C≡C−, −O−, −CO−, −COO− or −OCO−.
n ^K1 represents 0, 1, 2, 3 or 4
^AK1 and ^AK2 are independent of each other
(A) 1,4-cyclohexylene group (this is present in the group one -CH ₂ - or nonadjacent two or more -CH ₂ - may be replaced by -O- or -S- (May be) and (b) 1,4-phenylene group (one -CH = existing in this group or two or more -CH = not adjacent to each other may be replaced with -N =).
Represents a group selected from the group consisting of, and the hydrogen atoms on the above groups (a) and (b) may be independently substituted with cyano groups, fluorine atoms or chlorine atoms, respectively.
Z ^K1 and ^{Z K2} each independently represent a single _{bond, -CH 2 CH 2 -, -} (CH 2) 4 -, - OCH 2 -, - CH 2 O -, - OCF 2 -, - CF 2 O-, Represents −COO−, −OCO− or −C≡C−
When n ^K1 is 2, 3 or 4 and there ^{are a plurality of AK2} , they may be the same or different, and when ^nK1 is 2, 3 or 4 and there are a plurality of ^{Z K1s.} If so, they may be the same or different,
X ^K1 and X ^K3 independently represent a hydrogen atom, a chlorine atom or a fluorine atom, respectively.
X ^K2 represents a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, a trifluoromethyl group, a fluoromethoxy group, a difluoromethoxy group, a trifluoromethoxy group or a 2,2,2-trifluoroethyl group.

In the general formula (K), ^RK1 is an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, or an alkenyloxy having 2 to 8 carbon atoms. The group is preferable, an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkenyloxy group having 2 to 5 carbon atoms is preferable. Alkyl groups having 1 to 5 or alkoxy groups having 2 to 5 carbon atoms are more preferable, alkyl groups having 2 to 5 carbon atoms or alkoxy groups having 2 to 3 carbon atoms are more preferable, and alkoxy groups having 3 carbon atoms are more preferable. (Propenyl group) is particularly preferable.

Preferably R ^K1 is an alkyl group in the case of emphasizing reliability, it is preferred when emphasizing a reduction in viscosity is an alkenyl group.

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

The alkenyl group is preferably selected from the groups represented by any of the formulas (R1) to (R5). (The black dots in each formula represent carbon atoms in the ring structure to which the alkenyl group is bonded.)

Preferably when it is desired A ^K1 and A ^K2 is to increase the Δn each independently is an aromatic, preferably to improve the response speed is an aliphatic, trans-1,4 -Cyclohexylene group, 1,4-phenylene group, 2-fluoro-1,4-phenylene group, 3-fluoro-1,4-phenylene group, 3,5-difluoro-1,4-phenylene group, 2, 3-Difluoro-1,4-phenylene group, 1,4-cyclohexenylene group, 1,4-bicyclo [2.2.2] octylene group, piperidine-1,4-diyl group, naphthalene-2,6- It is preferable to represent a diyl group, a decahydronaphthalene-2,6-diyl group or a 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, and more preferably to represent the following structure.

It is more preferable to represent the following structure.

Z ^K1 and ^{Z K2} are each _{independently -CH 2 O -, - CF 2} O -, - CH 2 CH 2 -, - CF 2 CF 2 - or preferably a single bond, _-CF 2 O-, -CH ₂ CH _2- or single bond is more preferred, and -CF ₂ O- or single bond is particularly preferred.

n ^K1 is preferably 0, 1, 2 or 3, preferably 0, 1 or 2, preferably 0 or 1 when focusing on improvement of Δε, and preferably 1 or 2 when focusing on Tni. ..

The types of compounds that can be combined are not particularly limited, but they are used in combination according to desired performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, and three types as one embodiment of the present invention. Furthermore, in another embodiment of the present invention, there are four types, five types, six types, and seven or more types.

In the liquid crystal composition, the content of the compound represented by the general formula (K) includes solubility at low temperature, transition temperature, electrical reliability, birefringence, process compatibility, dripping marks, seizure, and dielectric constant. It is necessary to make appropriate adjustments according to the required performance such as anisotropy.

The lower limit of the preferable content of the compound represented by the formula (K) with respect to the total amount of the liquid crystal composition is 1%, 10%, 20%, 30%, and 40%. Yes, 50%, 55%, 60%, 65%, 70%, 75%, 80%. The preferred upper limit of the content is, for example, 95%, 85%, 75%, 65%, 55% in one embodiment of the present invention, based on the total amount of the liquid crystal composition. It is 45%, 35%, and 25%.

When a composition having a low viscosity and a high response speed is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when the Tni of the liquid crystal composition is kept high and a composition having good temperature stability is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when it is desired to increase the dielectric anisotropy in order to keep the drive voltage low, it is preferable to raise the above lower limit value and raise the upper limit value.

The compound represented by the general formula (K) is preferably a compound selected from the compound group represented by the general formula (K-1), for example.

(In the formula, ^RK11 represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and X ^{K11 to} X ^K14 are independently hydrogens. represents an atom or a fluorine ^{atom, Y K11} represents a fluorine atom or OCF _3.)
The types of compounds that can be combined are not particularly limited, but they are used in combination according to desired performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, and three or more types as one embodiment of the present invention.

The lower limit of the preferable content of the compound represented by the formula (K-1) with respect to the total amount of the liquid crystal composition is 1%, 2%, 5%, 8%, and 10%. %, 13%, 15%, 18%, 20%, 22%, 25%, 30%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

When a composition having a low viscosity and a high response speed is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when the Tni of the liquid crystal composition is kept high and a composition having good temperature stability is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when it is desired to increase the dielectric anisotropy in order to keep the drive voltage low, it is preferable to raise the above lower limit value and raise the upper limit value.

Further, the compound represented by the general formula (K-1) is preferably a compound represented by the formulas (K-1.1) to (K-1.4), and is preferably a compound represented by the formula (K-1.4). The compound represented by K-1.1) or the formula (K-1.2) is preferable, and the compound represented by the formula (K-1.2) is more preferable. It is also preferable to use the compounds represented by the formula (K-1.1) or the formula (K-1.2) at the same time.

The lower limit of the preferred content of these compounds relative to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%, 8%, 10%. It is 13%, 15%, 18%, and 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

The compound represented by the general formula (K) is preferably a compound selected from the compound group represented by the general formula (K-2), for example.

(In the formula, ^RK21 represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and X ^{K21 to} X ^K24 are independently hydrogens. Represents an atom or a fluorine atom, and ^YK21 represents a fluorine atom or OCF ₃₎
The types of compounds that can be combined are not particularly limited, but they are used in combination according to desired performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, and three or more types as one embodiment of the present invention.

The lower limit of the preferable content of the compound represented by the formula (K-2) with respect to the total amount of the liquid crystal composition is 1%, 2%, 5%, 8%, and 10%. %, 13%, 15%, 18%, 20%, 22%, 25%, 30%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

When a composition having a low viscosity and a high response speed is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when the Tni of the liquid crystal composition is kept high and a composition having good temperature stability is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when it is desired to increase the dielectric anisotropy in order to keep the drive voltage low, it is preferable to raise the above lower limit value and raise the upper limit value.

Further, the compound represented by the general formula (K-2) is preferably a compound represented by the formulas (K-2.1) to (K-2.6), and the compound represented by the formula (K-2.6) is preferable. The compound represented by K-2.5) or the formula (K-2.6) is preferable, and the compound represented by the formula (K-2.6) is more preferable. It is also preferable to use the compounds represented by the formula (K-2.5) or the formula (K-2.6) at the same time.

The lower limit of the preferred content of these compounds relative to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%, 8%, 10%. It is 13%, 15%, 18%, and 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

The compound represented by the general formula (K) is preferably a compound selected from the compound group represented by the general formula (K-3), for example.

(In the formula, ^RK31 represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and X ^{K31 to} X ^K36 are independently hydrogens. Represents an atom or a fluorine atom, and ^YK31 represents a fluorine atom or an OCI _3).
The types of compounds that can be combined are not particularly limited, but they are used in combination according to desired performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, and three or more types as one embodiment of the present invention.

The lower limit of the preferable content of the compound represented by the formula (K-3) with respect to the total amount of the liquid crystal composition is 1%, 2%, 5%, 8%, and 10%. %, 13%, 15%, 18%, 20%, 22%, 25%, 30%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

When a composition having a low viscosity and a high response speed is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when the Tni of the liquid crystal composition is kept high and a composition having good temperature stability is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when it is desired to increase the dielectric anisotropy in order to keep the drive voltage low, it is preferable to raise the above lower limit value and raise the upper limit value.

Further, the compound represented by the general formula (K-3) is preferably a compound represented by the formulas (K-3.1) to (K-3.4), and is preferably a compound represented by the formula (K-3.4). It is more preferable that the compound is represented by K-3.1) or the formula (K-3.2). It is also preferable to use the compounds represented by the formulas (K-3.1) and (K-3.2) at the same time.

The lower limit of the preferred content of these compounds relative to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%, 8%, 10%. It is 13%, 15%, 18%, and 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

The compound represented by the general formula (K) is preferably a compound selected from the compound group represented by the general formula (K-4), for example.

(In the formula, ^RK41 represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms, and X ^{K41 to} X ^K46 are independently hydrogens. Represents an atom or a fluorine atom, Y ^K41 represents a fluorine atom or OCF ₃ , and Z ^K41 represents -OCH _2- , -CH ₂ O-, -OCF _2- or -CF ₂ O-).
The types of compounds that can be combined are not particularly limited, but they are used in combination according to desired performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, and three or more types as one embodiment of the present invention.

The lower limit of the preferable content of the compound represented by the formula (K-4) with respect to the total amount of the liquid crystal composition is 1%, 2%, 5%, 8%, and 10%. %, 13%, 15%, 18%, 20%, 22%, 25%, 30%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

When a composition having a low viscosity and a high response speed is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when the Tni of the liquid crystal composition is kept high and a composition having good temperature stability is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when it is desired to increase the dielectric anisotropy in order to keep the drive voltage low, it is preferable to raise the above lower limit value and raise the upper limit value.

Further, the compound represented by the general formula (K-4) is preferably a compound represented by the formulas (K-4.1) to (K-4.18), and is preferably a compound represented by the formula (K-4.18). Compounds represented by K-4.1), formula (K-4.2), formula (K-4.11), and (K-4.12) are more preferable. It is also preferable to use the compounds represented by the formulas (K-4.1), (K-4.2), (K-4.11) and (K-4.12) at the same time.

The lower limit of the preferred content of these compounds relative to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%, 8%, 10%. It is 13%, 15%, 18%, and 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

The compound represented by the general formula (K) is preferably a compound selected from the compound group represented by the general formula (K-5), for example.

(In the formula, ^RK51 represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and X ^{K51 to} X ^K56 are independently hydrogens. Represents an atom or a fluorine atom, Y ^K51 represents a fluorine atom or OCF ₃ , and Z ^K51 represents -OCH _2- , -CH ₂ O-, -OCF _2- or -CF ₂ O-).
The types of compounds that can be combined are not particularly limited, but they are used in combination according to desired performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, and three or more types as one embodiment of the present invention.

The lower limit of the preferable content of the compound represented by the formula (K-5) with respect to the total amount of the liquid crystal composition is 1%, 2%, 5%, 8%, and 10%. %, 13%, 15%, 18%, 20%, 22%, 25%, 30%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

When a composition having a low viscosity and a high response speed is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when the Tni of the liquid crystal composition is kept high and a composition having good temperature stability is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when it is desired to increase the dielectric anisotropy in order to keep the drive voltage low, it is preferable to raise the above lower limit value and raise the upper limit value.

Further, the compound represented by the general formula (K-5) is preferably a compound represented by the formulas (K-5.1) to (K-5.18), and is preferably a compound represented by the formula (K-5.18). The compounds represented by the formulas (K-5.14) from K-5.11) are preferable, and the compounds represented by the formula (K-5.12) are more preferable.

The lower limit of the preferred content of these compounds relative to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%, 8%, 10%. It is 13%, 15%, 18%, and 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

The compound represented by the general formula (K) is preferably a compound selected from the compound group represented by the general formula (K-6), for example.

(In the formula, ^RK61 represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and X ^{K61 to} X ^K68 are independently hydrogens. represents an atom or a fluorine ^{atom, Y K61} represents a fluorine atom or OCF ^{_3, Z K61} is _{-OCH 2 -, - CH 2 O} -, - OCF 2 - or an _-CF 2 O-).
The types of compounds that can be combined are not particularly limited, but they are used in combination according to desired performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, and three or more types as one embodiment of the present invention.

The lower limit of the preferable content of the compound represented by the formula (K-6) with respect to the total amount of the liquid crystal composition is 1%, 2%, 5%, 8%, and 10%. %, 13%, 15%, 18%, 20%, 22%, 25%, 30%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.

When a composition having a low viscosity and a high response speed is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when the Tni of the liquid crystal composition is kept high and a composition having good temperature stability is required, it is preferable to lower the lower limit value and lower the upper limit value. Further, when it is desired to increase the dielectric anisotropy in order to keep the drive voltage low, it is preferable to raise the above lower limit value and raise the upper limit value.

Further, the compound represented by the general formula (K-6) is preferably a compound represented by the formulas (K-6.1) to (K-6.18), and the compound represented by the formula (K-6.18) is preferable. The compounds represented by the formulas (K-6.18) from K-6.15) are preferable, and the compounds represented by the formulas (K-6.16) and (K-6.17) are more preferable. It is also preferable to use the compounds represented by the formulas (K-6.16) and the formula (K-6.17) at the same time.

The lower limit of the preferred content of these compounds relative to the total amount of the liquid crystal composition is 1%, 2%, 4%, 5%, 8%, 10%. It is 13%, 15%, 18%, and 20%. The preferred upper limit of content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10%. It is 8% and 5%.








The liquid crystal composition preferably contains one or more compounds represented by the general formula (L). The compound represented by the general formula (L) corresponds to a dielectrically substantially neutral compound (the value of Δε is -2 to 2).

(Wherein, R ^L1 and R ^L2 represent each independently an alkyl group having 1 to 8 carbon atoms, one or non-adjacent two or more -CH 2 in the alkyl group _- is independently It may be replaced by −CH = CH−, −C≡C−, −O−, −CO−, −COO− or −OCO−.
n ^L1 represents 0, 1, 2 or 3
A ^{L1, A L2,} and ^{A L3} each independently (a) 1,4-cyclohexylene group (this is present in the group one -CH ₂ - or nonadjacent two or more -CH ₂ - May be replaced with -O-) and (b) 1,4-phenylene group (one -CH = present in this group or two or more non-adjacent -CH = -N May be replaced with =)
(C) Naphthalene-2,6-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or decahydronaphthalene-2,6-diyl group (naphthalene-2,6-diyl group or One -CH = existing in the 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or two or more non-adjacent -CH = may be replaced with -N =. )
Represents a group selected from the group consisting of, and the above groups (a), groups (b) and groups (c) may be independently substituted with cyano groups, fluorine atoms or chlorine atoms, respectively.
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 Represents −, −CF ₂ O−, −CH = NN = CH−, −CH = CH−, −CF = CF− or −C≡C−.
If n ^L1 is 2 or 3 and there ^{are a plurality of A L2s} , they may be the same or different, and if n ^L1 is 2 or 3 and there are a plurality of ^{Z L2s, they may be the same or different.} May be the same or different, except for the compounds represented by the general formulas (N-1), (N-2), (N-3) and (J). )
The compound represented by the general formula (L) may be used alone or in combination. The types of compounds that can be combined are not particularly limited, but they are appropriately combined and used according to desired performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The type of compound used is, for example, one type as one embodiment of the present invention. Alternatively, in another embodiment of the present invention, there are two types, three types, four types, five types, six types, seven types, eight types, nine types, and ten. More than a kind.

In the liquid crystal composition, the content of the compound represented by the general formula (L) includes solubility at low temperature, transition temperature, electrical reliability, birefringence, process compatibility, dripping marks, seizure, and dielectric constant. It is necessary to make appropriate adjustments according to the required performance such as anisotropy.

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

When a composition having a low viscosity and a high response speed is required, it is preferable that the above lower limit value is high and the upper limit value is high. Further, when a composition having a high Tni of the liquid crystal composition and good temperature stability is required, it is preferable that the above lower limit value is high and the upper limit value is high. Further, when it is desired to increase the dielectric anisotropy in order to keep the drive voltage low, it is preferable that the above lower limit value is low and the upper limit value is low.

When reliability is important, ^{both RL1} and ^RL2 are preferably alkyl groups, and when reducing the volatility of the compound is important, they are preferably alkoxy groups, and reduction of viscosity is important. It is preferable that at least one of them is an alkenyl group.

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

^RL1 and ^RL2 are linear alkyl groups having 1 to 5 carbon atoms and linear carbon atoms 1 to 4 when the ring structure to which they are bonded is a phenyl group (aromatic). The alkoxy group and the alkenyl group having 4 to 5 carbon atoms are preferable, and when the ring structure to which the alkoxy group is bonded is a saturated ring structure such as cyclohexane, pyran and dioxane, the linear carbon atom number is 1 to 5. Alkyl groups, linear alkoxy groups having 1 to 4 carbon atoms and linear alkenyl groups having 2 to 5 carbon atoms are preferable. In order to stabilize the nematic phase, the total of carbon atoms and oxygen atoms, if present, is preferably 5 or less, and is preferably linear.

The alkenyl group is preferably selected from the groups represented by any of the formulas (R1) to (R5). (The black dots in each equation represent carbon atoms in the ring structure.)

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

Preferably A ^L1, A ^L2, and A ^L3 if it is required to increase the Δn is aromatic, preferably to improve the response speed is an aliphatic, independently trans - 1,4-Cyclohexylene group, 1,4-phenylene group, 2-fluoro-1,4-phenylene group, 3-fluoro-1,4-phenylene group, 3,5-difluoro-1,4-phenylene group , 1,4-Cyclohexenylene group, 1,4-bicyclo [2.2.2] octylene group, piperidine-1,4-diyl group, naphthalene-2,6-diyl group, decahydronaphthalene-2,6 It preferably represents a −diyl group or 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, more preferably the following structure.

It is more preferable to represent a trans-1,4-cyclohexylene group or a 1,4-phenylene group.

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

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

The compound represented by the general formula (L) is preferably a compound selected from the compound group represented by the general formulas (L-1) to (L-8).

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

^{(Wherein, R L11} and ^{R L12} are each independently the same meaning as ^{R L1} and ^{R L2} in Formula (L).)
^RL11 and ^RL12 are preferably a linear alkyl group having 1 to 5 carbon atoms, a linear alkoxy group having 1 to 4 carbon atoms, and a linear alkenyl group having 2 to 5 carbon atoms. ..

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

The lower limit of the preferable content is 1%, 2%, 3%, 5%, 7%, 10%, and 15% with respect to the total amount of the liquid crystal composition. Yes, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%. The upper limit of the preferable content is 95%, 90%, 85%, 80%, 75%, 70%, and 65% with respect to the total amount of the liquid crystal composition. Yes, 60%, 55%, 50%, 45%, 40%, 35%, 30%, 25%.

When a composition having a low viscosity and a high response speed is required, it is preferable that the above lower limit value is high and the upper limit value is high. Further, when a composition having a high Tni of the liquid crystal composition and good temperature stability is required, it is preferable that the lower limit value is moderate and the upper limit value is moderate. Further, when it is desired to increase the dielectric anisotropy in order to keep the drive voltage low, it is preferable that the above lower limit value is low and the upper limit value is low.

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

(In the formula, ^RL12 has the same meaning as in the general formula (L-1).)
The compound represented by the general formula (L-1-1) is a compound selected from the compound group represented by the formulas (L-1-1.1) to (L-1-1.3). Is preferable, and the compound is preferably represented by the formula (L-1-1.2) or the formula (L-1-1.3), and in particular, the compound is represented by the formula (L-1-1.3). It is preferably a compound.

The lower limit of the preferable content of the compound represented by the formula (L-1-1.3) with respect to the total amount of the liquid crystal composition is 1%, 2%, 3%, and 5%. It is 7% and 10%. The upper limit of the preferable content is 20%, 15%, 13%, 10%, 8%, 7%, and 6% with respect to the total amount of the liquid crystal composition. Yes, 5%, and 3%.

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

(In the formula, ^RL12 has the same meaning as in the general formula (L-1).)
The lower limit of the preferable content of the compound represented by the formula (L-1-2) with respect to the total amount of the liquid crystal composition is 1%, 5%, 10%, and 15%. , 17%, 20%, 23%, 25%, 27%, 30%, 35%. The upper limit of the preferable content is 60%, 55%, 50%, 45%, 42%, 40%, and 38% with respect to the total amount of the liquid crystal composition. Yes, 35%, 33%, 30%.

Further, the compound represented by the general formula (L-1-2) is a compound selected from the compound group represented by the formulas (L-1-2.1) to (L-1-2.4). It is preferable that the compound is represented by the formulas (L-1-2.2) to (L-1-2.4). In particular, the compound represented by the formula (L-1-2.2) is preferable because it particularly improves the response speed of the liquid crystal composition. Further, when obtaining Tni higher than the response speed, it is preferable to use a compound represented by the formula (L-1-2.3) or the formula (L-1-2.4). The content of the compounds represented by the formulas (L-1-2.3) and (L-1-2.4) is not preferably 30% or more in order to improve the solubility at a low temperature.

The lower limit of the preferable content of the compound represented by the formula (L-1-2.2) with respect to the total amount of the liquid crystal composition is 10%, 15%, 18%, and 20%. , 23%, 25%, 27%, 30%, 33%, 35%, 38%, 40%. The upper limit of the preferable content is 60%, 55%, 50%, 45%, 43%, 40%, and 38% with respect to the total amount of the liquid crystal composition. Yes, 35%, 32%, 30%, 27%, 25%, 22%.

The lower limit of the total preferable content of the compound represented by the formula (L-1-1.3) and the compound represented by the formula (L-1-2.2) with respect to the total amount of the liquid crystal composition is 10%, 15%, 20%, 25%, 27%, 30%, 35%, 40%. The upper limit of the preferable content is 60%, 55%, 50%, 45%, 43%, 40%, and 38% with respect to the total amount of the liquid crystal composition. Yes, 35%, 32%, 30%, 27%, 25%, 22%.

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

(In the formula, ^RL13 and ^RL14 independently represent an alkyl group having 1 to 8 carbon atoms or an alkoxy group having 1 to 8 carbon atoms.)
^RL13 and ^RL14 are preferably a linear alkyl group having 1 to 5 carbon atoms, a linear alkoxy group having 1 to 4 carbon atoms, and a linear alkenyl group having 2 to 5 carbon atoms. ..

The lower limit of the preferable content of the compound represented by the formula (L-1-3) with respect to the total amount of the liquid crystal composition is 1%, 5%, 10%, and 13%. , 15%, 17%, 20%, 23%, 25%, 30%. The upper limit of the preferable content is 60%, 55%, 50%, 45%, 40%, 37%, and 35% with respect to the total amount of the liquid crystal composition. Yes, 33%, 30%, 27%, 25%, 23%, 20%, 17%, 15%, 13%, 10% is there.
Further, the compound represented by the general formula (L-1--3) is a compound selected from the compound group represented by the formulas (L-1-3.1) to (L-1-3.12). It is preferable that the compound is represented by the formula (L-1-3.1), the formula (L-1-3.3) or the formula (L-1-3.4). In particular, the compound represented by the formula (L-1-3.1) is preferable because it particularly improves the response speed of the liquid crystal composition. Further, when obtaining Tni higher than the response speed, the formula (L-1-3.3), the formula (L-1-3.4), the formula (L-1-3.11) and the formula (L-) are obtained. It is preferable to use the compound represented by 1-3.12). Total of compounds represented by formula (L-1-3.3), formula (L-1-3.4), formula (L-1-3.11) and formula (L-1-3.12). The content of is not preferably 20% or more in order to improve the solubility at low temperature.

The lower limit of the preferable content of the compound represented by the formula (L-1-3.1) with respect to the total amount of the liquid crystal composition is 1%, 2%, 3%, and 5%. , 7%, 10%, 13%, 15%, 18%, 20%. The upper limit of the preferable content is 20%, 17%, 15%, 13%, 10%, 8%, and 7% with respect to the total amount of the liquid crystal composition. Yes, it is 6%.

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

(In the formula, ^RL15 and ^RL16 independently represent an alkyl group having 1 to 8 carbon atoms or an alkoxy group having 1 to 8 carbon atoms.)
^RL15 and ^RL16 are preferably a linear alkyl group having 1 to 5 carbon atoms, a linear alkoxy group having 1 to 4 carbon atoms, and a linear alkenyl group having 2 to 5 carbon atoms. ..

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

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

Further, the compounds represented by the general formulas (L-1-4) and (L-1-5) are represented by the formulas (L-1-5.3) from the formulas (L-1-4.1). It is preferable that the compound is selected from the above-mentioned compound group, and the compound represented by the formula (L-1-4.2) or the formula (L-1-5.2) is preferable.

The lower limit of the preferable content of the compound represented by the formula (L-1-4.2) with respect to the total amount of the liquid crystal composition is 1%, 2%, 3%, and 5%. , 7%, 10%, 13%, 15%, 18%, 20%. The upper limit of the preferable content is 20%, 17%, 15%, 13%, 10%, 8%, and 7% with respect to the total amount of the liquid crystal composition. Yes, it is 6%.

Equation (L-1-1.3), Equation (L-1-2.2), Equation (L-1-3.1), Equation (L-1-3.3), Equation (L-1- It is preferable to combine two or more compounds selected from the compounds represented by 3.4), the formula (L-1-3.11) and the formula (L-1-3.12), and the formula (L-1). -1.3), formula (L-1-2.2), formula (L-1-3.1), formula (L-1-3.3), formula (L-1-3.4) and It is preferable to combine two or more compounds selected from the compounds represented by the formula (L-1-4.2), and the lower limit of the preferable content of the total content of these compounds is the total amount of the liquid crystal composition. On the other hand, 1%, 2%, 3%, 5%, 7%, 10%, 13%, 15%, 18%, 20 %, 23%, 25%, 27%, 30%, 33%, 35%, and the upper limit is 80% with respect to the total amount of the liquid crystal composition. Yes, 70%, 60%, 50%, 45%, 40%, 37%, 35%, 33%, 30%, 28% Yes, 25%, 23%, 20%. When the reliability of the composition is emphasized, the compounds represented by the formulas (L-1-3.1), (L-1-3.3) and (L-1-3.4)) are used. It is preferable to combine two or more compounds selected from the above, and when the response speed of the composition is important, it is represented by the formulas (L-1-1.3) and (L-1-2.2). It is preferable to combine two or more compounds selected from the above compounds.
The compound represented by the general formula (L-1) is preferably a compound selected from the compound group represented by the general formula (L-1-6).

(In the formula, ^RL17 and ^RL18 each independently represent a methyl group or a hydrogen atom.)
The lower limit of the preferable content of the compound represented by the formula (L-1-6) with respect to the total amount of the liquid crystal composition is 1%, 5%, 10%, and 15%. , 17%, 20%, 23%, 25%, 27%, 30%, 35%. The upper limit of the preferable content is 60%, 55%, 50%, 45%, 42%, 40%, and 38% with respect to the total amount of the liquid crystal composition. Yes, 35%, 33%, 30%.

Further, the compound represented by the general formula (L-1-6) is a compound selected from the compound group represented by the formulas (L-1-6.1) to (L-1-6.3). It is preferable to have.

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

^{(Wherein, R L21} and ^{R L22} are each independently the same meaning as ^{R L1} and ^{R L2} in Formula (L).)
^RL21 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and ^RL22 is an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms or a carbon atom. Alkoxy groups of numbers 1 to 4 are preferable.

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

When the solubility at low temperature is emphasized, the effect is high when the content is set high, and conversely, when the response speed is emphasized, the effect is high when the content is set low. Further, when improving the dripping marks and the seizure characteristics, it is preferable to set the content range in the middle.

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

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

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

^{(Wherein, R L31} and ^{R L32} are each independently the same meaning as ^{R L1} and ^{R L2} in Formula (L).)
^RL31 and ^RL32 are preferably alkyl groups having 1 to 5 carbon atoms, alkenyl groups having 4 to 5 carbon atoms, or alkoxy groups having 1 to 4 carbon atoms, respectively.

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

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

When obtaining a high birefringence, setting a large content is highly effective, and conversely, when emphasizing a high Tni, setting a low content is highly effective. Further, when improving the dripping marks and the seizure characteristics, it is preferable to set the content range in the middle.

Further, the compound represented by the general formula (L-3) is preferably a compound selected from the compound group represented by the formulas (L-3.1) to (L-3.4), preferably the formula. It is preferably a compound represented by the formulas (L-3.7) from (L-3.2).

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

^{(Wherein, R L41} and ^{R L42} are each independently the same meaning as ^{R L1} and ^{R L2} in Formula (L).)
^RL41 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and ^RL42 is an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms or a carbon atom. Alkoxy groups of numbers 1 to 4 are preferable. )
The compound represented by the general formula (L-4) can be used alone, or two or more compounds can be used in combination. The types of compounds that can be combined are not particularly limited, but they are appropriately combined and used according to the required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. The types of compounds used are, for example, one type, two types, three types, four types, and five or more types as one embodiment of the present invention.

In the liquid crystal composition, the content of the compound represented by the general formula (L-4) includes solubility at low temperature, transition temperature, electrical reliability, birefringence, process compatibility, dripping marks, seizure, and the like. It is necessary to make appropriate adjustments according to the required performance such as dielectric anisotropy.

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

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

Depending on the required performance such as solubility at low temperature, transition temperature, electrical reliability, birefringence, etc., even if the compound represented by the formula (L-4.1) is contained, the formula (L) is contained. Even if it contains the compound represented by 4.2), it contains both the compound represented by the formula (L-4.1) and the compound represented by the formula (L-4.2). It may contain all the compounds represented by the formulas (L-4.1) to (L-4.3). The lower limit of the preferable content of the compound represented by the formula (L-4.1) or the formula (L-4.2) with respect to the total amount of the liquid crystal composition is 3% and 5%. 7%, 9%, 11%, 12%, 13%, 18%, 21%, and preferred upper limits are 45, 40%, 35. %, 30%, 25%, 23%, 20%, 18%, 15%, 13%, 10%, 8%.

When both the compound represented by the formula (L-4.1) and the compound represented by the formula (L-4.2) are contained, the content of both compounds is preferable with respect to the total amount of the liquid crystal composition. The lower limit of the amount is 15%, 19%, 24%, 30%, and the preferred upper limit is 45, 40%, 35%, 30%, and so on. It is 25%, 23%, 20%, 18%, 15%, and 13%.

The compound represented by the general formula (L-4) is preferably a compound represented by the formulas (L-4.4) to (L-4.6), for example, preferably the compound represented by the formula (L-4.4). ) Is preferable.

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

The lower limit of the preferable content of the compound represented by the formula (L-4.4) or the formula (L-4.5) with respect to the total amount of the liquid crystal composition is 3% and 5%. It is 7%, 9%, 11%, 12%, 13%, 18%, and 21%. Preferred upper limits are 45, 40%, 35%, 30%, 25%, 23%, 20%, 18%, 15%, 13 %, 10%, 8%.

When both the compound represented by the formula (L-4.4) and the compound represented by the formula (L-4.5) are contained, the content of both compounds is preferable with respect to the total amount of the liquid crystal composition. The lower limit of the amount is 15%, 19%, 24%, 30%, and the preferred upper limit is 45, 40%, 35%, 30%, and so on. It is 25%, 23%, 20%, 18%, 15%, and 13%.

The compound represented by the general formula (L-4) is preferably a compound represented by the formulas (L-4.7) to (L-4.10), and in particular, the compound represented by the formula (L-4. The compound represented by 9) is preferable.

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

^{(Wherein, R L51} and ^{R L52} are each independently the same meaning as ^{R L1} and ^{R L2} in Formula (L).)
^RL51 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and ^RL52 is an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms or a carbon atom. Alkoxy groups of numbers 1 to 4 are preferable.

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

In the liquid crystal composition, the content of the compound represented by the general formula (L-5) includes solubility at low temperature, transition temperature, electrical reliability, birefringence, process compatibility, dripping marks, seizure, and the like. It is necessary to make appropriate adjustments according to the required performance such as dielectric anisotropy.

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

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

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

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

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

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

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

^{(Wherein, R L61} and ^{R L62} each independently represent the same meaning as ^{R L1} and ^{R L2} in Formula ^{(L), X L61} and ^{X L62} each independently represents a hydrogen atom or a fluorine atom. )
^{Each of RL61} and ^RL62 is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and ^{one of XL61 and XL62} is a fluorine atom and the other is a hydrogen atom. Is preferable.

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

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

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

The types of compounds that can be combined are not particularly limited, but it is preferable to contain 1 to 3 types of these compounds, and even more preferably 1 to 4 types. Further, since the wide molecular weight distribution of the selected compound is also effective for solubility, for example, one kind from the compounds represented by the formula (L-6.1) or (L-6.2), the formula (L-). One type from the compound represented by 6.4) or (L-6.5), one type from the compound represented by the formula (L-6.6) or the formula (L-6.7), one type from the compound represented by the formula (L-6.7), the formula (L). It is preferable to select one kind of compound from the compounds represented by −6.8) or (L-6.9) and combine these appropriately. Among them, it is represented by the formula (L-6.1), the formula (L-6.3), the formula (L-6.4), the formula (L-6.6) and the formula (L-6.9). It preferably contains a compound.

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

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

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

^{(Wherein, R L71} and ^{R L72} each independently represent the same meaning as ^{R L1} and ^{R L2} in Formula ^{(L), A L71} and ^{A L72} is ^{A L2} and in the general formula (L) independently Although it has the same meaning as ^{A L3 , the hydrogen atoms on A L71} and A ^L72 may be independently substituted with fluorine atoms, and Z ^L71 has the same meaning as ^{Z L2} in the general formula (L). X ^L71 and ^{XL 72} independently represent a fluorine atom or a hydrogen atom.)
In the formula, ^RL71 and ^RL72 are preferably alkyl groups having 1 to 5 carbon atoms, alkenyl groups having 2 to 5 carbon atoms, or alkoxy groups having 1 to 4 carbon atoms, respectively, and ^{AL71 and AL72.} Are each independently preferably a 1,4-cyclohexylene group or a 1,4-phenylene group ^{, the hydrogen atoms on AL71} and ^AL72 may be independently substituted with fluorine atoms, and Z L71 is ^simply. Bonds or COO− are preferred, single bonds are preferred, and ^{XL71 and XL72} are preferably hydrogen atoms.

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

In the liquid crystal composition, the content of the compound represented by the general formula (L-7) includes solubility at low temperature, transition temperature, electrical reliability, birefringence, process compatibility, dripping marks, seizure, and the like. It is necessary to make appropriate adjustments according to the required performance such as dielectric anisotropy.

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

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

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

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

Further, the compound represented by the general formula (L-7) is a compound represented by the formulas (L-7.21) to (L-7.23). It is preferably a compound represented by the formula (L-7.21).

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

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

Further, the compound represented by the general formula (L-7) is preferably a compound represented by the formulas (L-7.51) to (L-7.53).

The compound represented by the general formula (L-8) is the following compound.

^{(Wherein, R L81} and ^{R L82} each independently represent the same meaning as ^{R L1} and ^{R L2} in Formula ^{(L), A L81} represents the same meaning or a single bond and ^{A L1} in formula (L) but the hydrogen atoms on a ^L81 may be substituted independently by fluorine atom, X ^L81 to X ^L86 each independently represents a fluorine atom or a hydrogen atom.)
In the formula, ^RL81 and ^RL82 are each independently preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms, and ^AL81 is 1, A 4-cyclohexylene group or a 1,4-phenylene group is preferable, and ^{hydrogen atoms on AL71 and AL72} may be independently substituted with fluorine atoms, and the same in the general formula (L-8). The number of fluorine atoms on the ring structure is preferably 0 or 1, and the number of fluorine atoms in the molecule is preferably 0 or 1.

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

In the liquid crystal composition, the content of the compound represented by the general formula (L-8) includes solubility at low temperature, transition temperature, electrical reliability, birefringence, process compatibility, dripping marks, seizure, and the like. It is necessary to make appropriate adjustments according to the required performance such as dielectric anisotropy.

The lower limit of the preferable content of the compound represented by the formula (L-8) with respect to the total amount of the liquid crystal composition is 1%, 2%, 3%, 5%, and 7%. %, 10%, 14%, 16%, 20%. The upper limit of the preferable content of the compound represented by the formula (L-8) with respect to the total amount of the liquid crystal composition is 30%, 25%, 23%, 20%, and 18%. %, 15%, 10%, 5%.

When an embodiment of Tni having a high liquid crystal composition is desired, the content of the compound represented by the formula (L-8) is preferably increased, and when an embodiment having a low viscosity is desired, the content is decreased. Is preferable.

Further, the compound represented by the general formula (L-8) is preferably a compound represented by the formulas (L-8.1) to (L-8.4), and the compound represented by the formula (L-8. 3), Equation (L-8.5), Equation (L-8.6), Equation (L-8.13), Equation (L-8.16) to Equation (L-8.18), Equation (L-8.18) More preferably, it is a compound represented by the formulas (L-8.28) from L-8.23).

The lower limit of the total preferable content of the compounds represented by the general formulas (L), (N) and (J) with respect to the total amount of the liquid crystal composition is 80%, 85% and 88%. 90%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 100%. Is. The preferred upper limit of the content is 100%, 99%, 98% and 95%. However, from the viewpoint of obtaining a composition having a large absolute value of Δε, it is preferable that either one of the compounds represented by the general formula (N) or (J) is 0%.

Compounds represented by general formulas (L-1) to (L-7), general formulas (M-1) to (M-8), and general formulas (N-1) with respect to the total amount of the liquid crystal composition. The lower limit of the total preferred content is 80%, 85%, 88%, 90%, 92%, 93%, 94%, 95%. It is 96%, 97%, 98%, 99%, and 100%. The preferred upper limit of the content is 100%, 99%, 98% and 95%.

The composition of the present invention preferably does not contain a compound having a structure in which oxygen atoms are bonded to each other, such as a peracid (-CO-OO-) structure, in the molecule.

When the reliability and long-term stability of the composition are emphasized, the content of the compound having a carbonyl group is preferably 5% or less, more preferably 3% or less, based on the total mass of the composition. It is preferably 1% or less, and most preferably not substantially contained.

When the stability by UV irradiation is emphasized, the content of the compound substituted with chlorine atoms is preferably 15% or less, preferably 10% or less, and 8%, based on the total mass of the composition. % Or less, more preferably 5% or less, more preferably 3% or less, and even more preferably substantially no content.

It is preferable to increase the content of the compound having all 6-membered ring structures in the molecule, and the content of the compound having all 6-membered ring structures in the molecule is 80 with respect to the total mass of the composition. % Or more, more preferably 90% or more, further preferably 95% or more, and the composition is composed only of a compound in which substantially all the ring structures in the molecule are 6-membered rings. It is most preferable to do so.

In order to suppress deterioration of the composition due to oxidation, it is preferable to reduce the content of the compound having a cyclohexenylene group as a ring structure, and the content of the compound having a cyclohexenylene group is added to the total mass of the composition. On the other hand, it is preferably 10% or less, preferably 8% or less, more preferably 5% or less, preferably 3% or less, and further preferably substantially not contained.

When the improvement of viscosity and the improvement of Tni are emphasized, the content of the compound having a 2-methylbenzene-1,4-diyl group in which the hydrogen atom may be substituted with halogen may be reduced. Preferably, the content of the compound having a 2-methylbenzene-1,4-diyl group in the molecule is preferably 10% or less, preferably 8% or less, based on the total mass of the composition. It is more preferably 5% or less, more preferably 3% or less, and further preferably substantially not contained.

In the present application, substantially not contained means that it is not contained except for an unintentionally contained substance.

When the compound contained in the composition of the first embodiment of the present invention has an alkenyl group as a side chain, and the alkenyl group is bonded to cyclohexane, the number of carbon atoms of the alkenyl group is 2 to 5. When the alkenyl group is bonded to benzene, the number of carbon atoms of the alkenyl group is preferably 4 to 5, and the unsaturated bond of the alkenyl group and benzene are directly bonded. It is preferable that there is no such thing.

_{The average elastic constant (KAVG} ) of the liquid crystal composition used in the present invention is preferably 10 to 25, but the lower limit thereof is preferably 10 is preferable, 10.5 is preferable, 11 is preferable, and 11.5 is preferable. , 12 is preferred, 12.3 is preferred, 12.5 is preferred, 12.8 is preferred, 13 is preferred, 13.3 is preferred, 13.5 is preferred, 13.8 is preferred, 14 is preferred, 14 .3 is preferred, 14.5 is preferred, 14.8 is preferred, 15 is preferred, 15.3 is preferred, 15.5 is preferred, 15.8 is preferred, 16 is preferred, 16.3 is preferred, 16 .5 is preferable, 16.8 is preferable, 17, is preferable, 17.3 is preferable, 17.5 is preferable, 17.8 is preferable, 18 is preferable, and 25 is preferable and 24.5 is preferable as the upper limit value thereof. Is preferable, 24 is preferable, 23.5 is preferable, 23 is preferable, 22.8 is preferable, 22.5 is preferable, 22.3 is preferable, 22 is preferable, 21.8 is preferable, and 21.5 is preferable. , 21.3 is preferable, 21 is preferable, 20.8 is preferable, 20.5 is preferable, 20.3 is preferable, 20 is preferable, 19.8 is preferable, 19.5 is preferable, and 19.3 is preferable. , 19 is preferred, 18.8 is preferred, 18.5 is preferred, 18.3 is preferred, 18 is preferred, 17.8 is preferred, 17.5 is preferred, 17.3 is preferred, and 17 is preferred. When emphasizing power reduction, it is effective to suppress the amount of light of the backlight, it is preferred that the liquid crystal display device to improve the light transmittance, it To achieve this the set lower value of K _AVG preferable. When the improvement of the response speed is emphasized, it is preferable to set the value of _{KAVG to a high value.}
(Composite liquid crystal composition)
In producing the liquid crystal display device of the present invention, it is preferable to use a composite liquid crystal composition containing the polymerizable compound and the liquid crystal compound. By encapsulating such a composite liquid crystal composition in an element and polymerizing the polymerizable compound in the element, the liquid crystal display element of the present invention can be efficiently produced.

From the viewpoint of obtaining a polymer matrix having the desired nanovoids, the composite liquid crystal composition has a mass ratio [polymerizable compound / liquid crystal compound] of the polymerizable compound contained in the composition to the liquid crystal compound of 10/90 to 70 /. It is preferably 30, more preferably 20/80 to 60/40, even more preferably 30/70 to 50/50, and particularly preferably 35/65 to 45/55.

Examples of the polymerization method of the polymerizable compound include radical polymerization, anionic polymerization, cationic polymerization and the like, but radical polymerization is preferable.

As the radical polymerization initiator, a thermal polymerization initiator and a photopolymerization initiator can be used, but it is preferable to use a photopolymerization initiator.

Preferred photopolymerization initiators include, for example, diethoxyacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, benzyldimethyl ketal (2,2-dimethoxy-1,2-diphenylethane-1-. On), 1- (4-isopropylphenyl) -2-hydroxy-2-methylpropan-1-one, 4- (2-hydroxyethoxy) phenyl- (2-hydroxy-2-propyl) ketone, 1-hydroxycyclohexyl -Initiation of acetophenone-based photopolymerization of phenyl ketone, 2-methyl-2-morpholino (4-thiomethylphenyl) propan-1-one, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butanone, etc. Agent;
Benzoin-based photopolymerization initiators such as benzoin, benzoin isopropyl ether, and benzoin isobutyl ether;
Acylphosphine oxide-based photopolymerization initiators such as 2,4,6-trimethylbenzoyldiphenylphosphine oxide;
Benzyl, methylphenylgrioxy ester-based photopolymerization initiator;
Benzophenone, o-benzoyl methyl benzoate, 4-phenylbenzophenone, 4,'-dichlorobenzophenone, hydroxybenzophenone, 4-benzoyl-4'-methyl-diphenylsulfide, acrylicized benzophenone, 3,3', 4,4'- Benzophenone-based photopolymerization initiators such as tetra (tert-butylperoxycarbonyl) benzophenone and 3,3'-dimethyl-4-methoxybenzophenone;
Thioxantone-based photopolymerization initiators such as 2-isopropylthioxanthone, 2,4-dimethylthioxanthone, 2,4-diethylthioxanthone, and 2,4-dichlorothioxanthone;
Aminobenzophenone-based photopolymerization initiators such as Michler ketone and 4,4'-diethylaminobenzophenone;
Examples thereof include 10-butyl-2-chloroacridone; 2-ethylanthraquinone; 9,10-phenanthrenequinone; camphorquinone and the like.

Among these, benzyl dimethyl ketal is most preferable as the photopolymerization initiator.

When the composite liquid crystal composition is for driving a TFT, it is preferable to use a purified polymerization initiator.

In the composite liquid crystal composition, the content of the polymerization initiator is not particularly limited, but is preferably 0.1 to 2% by mass from the viewpoint that the polymerization proceeds more smoothly.

In addition to the liquid crystal compound, the polymerizable compound and the polymerization initiator, the composite liquid crystal composition contains, if necessary, other components (arbitrary components) other than these as long as the effects of the present invention are not impaired. You may.

Examples of the other components include antioxidants, ultraviolet absorbers, non-reactive oligomers, inorganic fillers, organic fillers, polymerization inhibitors, defoamers, leveling agents, plasticizers, silane coupling agents and the like. Can be mentioned.

When the composite liquid crystal composition is for driving a TFT, it is preferable to use the purified other components.

The content of the other components in the composite liquid crystal composition is preferably 10% by mass or less, and more preferably 5% by mass or less.

The composite liquid crystal composition has a birefringence of 0.05 to 0.5, but a high birefringence of 0.16 or more is also possible.

In the composite liquid crystal composition, the polymerizable compound contained therein is polymerized by heat or active energy rays such as ultraviolet rays, which causes phase separation from the liquid crystal composition, and the polymer matrix and the liquid crystal composition are separated from each other. (For example, a polymer / liquid crystal composite film) is formed. The composite liquid crystal functions as a light control layer in the liquid crystal display element. At this time, the size of the voids in the polymer matrix can be adjusted to 20 nm or more and 400 nm or less by appropriately adjusting the polymerization conditions. As a condition at the time of polymerization, generally, the larger the reaction rate, the smaller the size of the voids can be reduced. The reaction rate at the time of polymerization can be adjusted by known means, for example, the type and number of polymerizable groups of the polymerizable compound, the amount of the polymerization initiator added, the amount of energy for polymerization such as heat and ultraviolet rays, or these means. It is possible by adjusting by the combination of.

This composite liquid crystal has a structure in which the liquid crystal composition is highly dispersed as nano-order droplets in the polymer matrix. As a result, the light control layer made of the composite liquid crystal has high transparency by suppressing scattering of visible light at the droplet interface of the liquid crystal composition.

Next, a method for manufacturing the liquid crystal display element of the present invention using the composite liquid crystal composition will be described.

The liquid crystal display element of the present invention is two substrates having electrodes, and the composite liquid crystal composition which is an isotropic phase is sandwiched between two substrates which are transparent substrates having at least one transparent electrode. After that, the polymerizable compound is polymerized by heating or irradiation with active energy rays to induce phase separation from the liquid crystal composition, whereby a layer composed of the liquid crystal composition and the polymer matrix is formed. ..

As the two substrates, a transparent material having flexibility such as glass or plastic can be used, and one of the substrates may be an opaque material such as silicon.

A transparent substrate having a transparent electrode layer can be produced, for example, by sputtering indium tin oxide (ITO) on a transparent substrate such as a glass plate. Further, by using a transparent substrate having a low wavelength dispersion, the light scattering ability of the device is enhanced, and the reflectance and contrast are improved, which is more preferable. Examples of the low wavelength dispersion transparent substrate include glass borosilicate, a plastic transparent film such as polyethylene terephthalate or polycarbonate, and a transparent substrate coated with a dielectric multilayer film using a 1 / 4λ optical interference condition. ..

Further, a polymer film, an alignment film or a color filter can be arranged on the substrate, if necessary.

Examples of the alignment film include a polyimide alignment film and a photoalignment film. As a method for forming the alignment film, for example, in the case of a polyimide alignment film, a polyimide resin composition is applied onto a transparent substrate, thermosetting at a temperature of 180 ° C. or higher, and further rubbing treatment with a cotton cloth or rayon cloth. There is a way to do it. Further, a polymer film such as a polyimide film which has not been subjected to a rubbing treatment can also be used. These films are useful for modifying the surface of the substrate to improve the adhesiveness with the polymer transparent substance in the composite liquid crystal phase, and for taking measures against uneven light scattering and the like.

The color filter can be produced by, for example, a pigment dispersion method, a printing method, an electrodeposition method, a dyeing method, or the like. As an example, a method for producing a color filter by a pigment dispersion method will be described. First, a curable coloring composition for a color filter is applied onto a transparent substrate, patterned, and cured by heating or light irradiation. By performing this step for each of the three colors of red, green, and blue, a pixel portion for a color filter can be produced. In addition, a pixel electrode provided with an active element such as a TFT, a thin film diode, or a metal insulator metal resistivity element may be provided on the substrate.

Next, the substrates are opposed to each other so that the transparent electrode layer is on the inside. At this time, the distance between the substrates may be adjusted via a spacer. Examples of the spacer include glass particles, plastic particles, alumina particles, photoresist material and the like.

Next, a sealant such as an epoxy-based thermosetting composition is screen-printed on the substrate in the form of providing a liquid crystal injection port, the substrates are bonded to each other, and the sealant is thermoset by heating.

Examples of the method for sandwiching the composite liquid crystal composition between the two substrates include a normal vacuum injection method, an ODF method, and the like. At this time, it is preferable that the composite liquid crystal composition is in a uniform isotropic state.

The radically polymerizable polymerizable compound is preferably polymerized by irradiation with ultraviolet rays.

As the lamp that generates ultraviolet rays, a metal halide lamp, a high-pressure mercury lamp, an ultra-high pressure mercury lamp, or the like can be used. Further, the wavelength of the ultraviolet rays to be irradiated is preferably a wavelength region that is in the absorption wavelength region of the photopolymerization initiator contained in the composite liquid crystal composition and is not in the absorption wavelength region of the liquid crystal composition contained in the composite liquid crystal composition. For example, a metal halide lamp, a high-pressure mercury lamp, an ultra-high-pressure mercury lamp, or the like may be used to cut ultraviolet rays having a wavelength of 330 nm or less, more preferably 350 nm or less, and irradiate the ultraviolet rays.

The irradiation intensity of ultraviolet rays is preferably 25 to 200 mW / cm ² , more preferably 30 to 150 mW / cm ² , and further ^{preferably 40 to 100 mW / cm 2} from the viewpoint of obtaining the nanovoids. preferable.

The ultraviolet irradiation time may be appropriately set according to the ultraviolet irradiation intensity, but is usually preferably 10 to 600 seconds. The ultraviolet exposure device has a shutter function, and at the start of exposure, the shutter is opened to uniformly and simultaneously apply ultraviolet rays to the entire surface of an element (hereinafter referred to as a composite liquid crystal element) in which the composite liquid crystal composition is enclosed. It is preferable to irradiate, and it is preferable to expose so that the ultraviolet intensity becomes constant while the shutter is open.

The temperature at the time of ultraviolet irradiation is, for example, preferably a temperature slightly higher than the isotropic-nematic transition point of the composite liquid crystal composition, preferably the transition point + 0.1 ° C. to 10 ° C., and the transition point +0. More preferably, it is 1 ° C. to 3 ° C. When the temperature of the composite liquid crystal element rises due to ultraviolet exposure, it is exposed through an infrared cut filter, and further, an ultraviolet exposure device equipped with a temperature-controllable plate is used so that the temperature of the composite liquid crystal element does not rise. Is preferable.
(Dimming layer)
The dimming layer made of a composite liquid crystal formed by using the composite liquid crystal composition has a structure in which the liquid crystal composition is dispersed as fine droplets in a three-dimensional network structure of a polymer matrix formed at high density. Is preferable. From the viewpoint of ease of production, the size of the droplets preferably has a lower limit of 20 nm or more, more preferably 40 nm or more, further preferably 60 nm or more, and particularly preferably 80 nm or more. From the viewpoint of maintaining high transmittance, the upper limit value is preferably 400 nm or less, more preferably 300 nm or less, further preferably 200 nm or less, and particularly preferably 150 nm or less.

In the liquid crystal display element, the polymer matrix has nanovoids of 20 nm or more and 400 nm or less. From the viewpoint of ease of production, the lower limit of the size of the nanovoids is preferably 40 nm or more, more preferably 60 nm or more, further preferably 80 nm or more, and from the viewpoint of maintaining high transmittance. The upper limit is preferably 300 nm or less, more preferably 200 nm or less, and even more preferably 150 nm or less.

From the viewpoint of obtaining a display element having excellent transparency, the proportion of nanovoids of at least 20 nm or more and 400 nm or less in the total voids contained in the polymer matrix is preferably 80% or more, and is preferably 90% or more. Is preferable, and 95% or more is preferable.

Whether or not the polymer matrix in the dimming layer satisfies the nanovoid distribution can also be determined by measuring the transmittance of the dimming layer in a state where no voltage is applied to the pixel electrode and the common electrode. Can be done. That is, when the measured value of the transmittance is 100 to 60%, the voids exceeding 400 nm, which cause light scattering, are few or substantially absent, so that the voids contained in the polymer matrix are at least substantial. It is 400 nm or less.

The display element of the present invention preferably has a transmittance of 100 to 60%, more preferably 100 to 70%, and even more preferably 100 to 80%.

The nano-void may be a substantially spherical hole or a connecting hole formed by connecting a plurality of the holes.

The polymer matrix preferably has a random network structure in which the polymer has no orientation from the viewpoint of maintaining optical isotropic properties.

The liquid crystal display element of the present invention enables color display by aligning and arranging light absorption layers having different light absorption wavelengths such as cyan, magenta, and yellow on pixel electrodes formed by dividing each color.

Further, the liquid crystal display element of the present invention can be added with functions such as specular reflection, diffuse reflection, retroreflective reflection, and hologram reflection.

The liquid crystal display element of the present invention can be used for the same purpose as a liquid crystal display element having a dimming layer of a type that changes the orientation state of the liquid crystal by a conventional electric field. The driving method of the liquid crystal display element is not particularly limited, and for example, it can be applied to any driving method of VA type, PSVA type, PSA type, FFS type, IPS type or ECB type driven by an active matrix. That is, the liquid crystal display element is roughly classified according to the arrangement of the electrodes in the element, and is a so-called vertical electric field type in which one of the two substrates facing the dimming element has a pixel electrode and the other has a common electrode, and one substrate. A so-called lateral / oblique electric field type having both a pixel electrode and a common electrode is known, but any method can be adopted for the liquid crystal display element of the present invention.

Further, since the liquid crystal display element of the present invention has high stress resistance, it can be applied to a liquid crystal display in which the liquid crystal display surface is curved or the liquid crystal display surface can be freely curved.
(Embodiment of liquid crystal display element)
Next, a specific embodiment of the liquid crystal display element of the present invention will be described by taking a lateral / oblique electric field type as an example.

The liquid crystal display element of the present invention is preferably applied to the FFS type or the IPS type. Hereinafter, examples of FFS type and IPS type liquid crystal display elements will be described with reference to FIGS. 1 to 7.

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

That is, the liquid crystal display element 10 according to the present invention includes a first polarizing plate 1, a first substrate 2, an electrode layer 3 including a thin film transistor, an alignment film 4, and a liquid crystal layer 5 containing a liquid crystal composition. The alignment film 4, the color filter 6, the second substrate 7, and the second polarizing plate 8 are sequentially laminated. For the first substrate 2 and the second substrate 7, a transparent material having flexibility such as glass or plastic can be used, and one of them may be an opaque material such as silicon. The two substrates 2 and 7 are bonded by a sealing material and a sealing material such as an epoxy-based thermosetting composition arranged in a peripheral region, and in order to maintain a distance between the substrates, for example, Granular spacers such as glass particles, plastic particles, and alumina particles, or spacer columns made of resin formed by a photolithography method may be arranged. Further, the liquid crystal display element 10 may be interposed with other layers (not shown here), and examples of such layers include a passivation film and a flattening film.

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

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

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

Amorphous silicon, polycrystalline polysilicon, and the like can be used for the semiconductor layer 13, but if a transparent semiconductor film such as ZnO, IGZO (In-Ga-Zn-O), or ITO is used, it is caused by light absorption. It is also preferable from the viewpoint of suppressing the harmful effects of optical carriers and increasing the opening ratio of the device.

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

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

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

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

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

On the electrode layer 3 and the color filter 6, a pair of alignment films 4 that directly contact with the liquid crystal composition constituting the liquid crystal layer 5 to induce homogenous orientation are provided. The alignment film 4 is, for example, a rubbing-treated polyimide film, and the orientation directions of the alignment films are parallel to each other.

Further, the polarizing plate 1 and the polarizing plate 8 can be adjusted so that the viewing angle and the contrast are good by adjusting the polarization axes of the respective polarizing plates so that the transmission axes thereof operate in the normal black mode. It is preferable to have transmission axes that are orthogonal to each other. In particular, it is preferable that either the polarizing plate 1 or the polarizing plate 8 is arranged so as to have a transmission axis parallel to the orientation direction of the liquid crystal molecules 30. Further, it is preferable to adjust the product of the refractive index anisotropy Δn of the liquid crystal and the cell thickness d so that the contrast is maximized. Further, a retardation film for widening the viewing angle can also be used.

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

The FFS type liquid crystal display element described with reference to FIGS. 1 to 3 is an example, and can be implemented in various other forms as long as it does not deviate from the technical idea of the present invention. For example, FIG. 5 is another example of an enlarged plan view of the region of the electrode layer 3 formed on the substrate 2 in FIG. 1 surrounded by the line II. As shown in FIG. 5, the pixel electrode 21 may have a slit. Further, the slit pattern may be formed so as to have an inclination angle with respect to the gate bus line 26 or the data bus line 25.

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

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

As described above, when the liquid crystal display element of the present invention is desired to be an FFS type display element, R ≧ G may be set, and when it is desired to be an IPS type display element, R <G may be set.

The present invention will be described in more detail with reference to Examples below, but the present invention is not limited to these Examples. In addition, "%" in the compositions of the following Examples and Comparative Examples means "mass%". The transmittance in the liquid crystal display element is a value when the transmittance of the element after forming the polymer matrix is measured, assuming that the transmittance of the element before injecting the composite liquid crystal composition is 100%.
(Example 1)
Each liquid crystal compound having a content (% by mass) of the value shown in Table 1 (total amount of 60 parts by mass) and each polymerizable compound having a content (% by mass) of the value shown in Table 2 (total amount: 39.22 parts by mass). Irgacure 651 (benzyl dimethyl ketal, 0.78 parts by mass) was further mixed as a polymerization initiator to prepare a composite liquid crystal composition.

The content of each liquid crystal compound in Table 1 is a value with respect to the total content (100% by mass) of the liquid crystal compounds. The content of each polymerizable compound in Table 2 is a value with respect to the total content (100% by mass) of the polymerizable compound.

The structure of the liquid crystal compound with each abbreviation in Table 1 is shown below. In these liquid crystal compounds, all the alkyl groups bonded to the ends are linear (n−).

The ^{compounds represented by the general formula (Ia) in which C 1} is a 1,4-cyclohexylene group are compounds having abbreviations LC4, LC5, and LC7-13.

The structures of the polymerizable compounds shown in Table 2 are shown below.
Here, the compound represented by the general formula (II-a) was used after being adjusted so that the average value of ^{n 2 was 7.}

CH ₂ = CH-CO-O (CH _2- CH ₂ O) _n OC-CH = CH ₂
(II-a2)
(In the formula, n represents an integer of 3 to 14.)

(II-b)
(In the formula, B ¹ represents a hydrogen atom or a methyl group, and represents
B ² represents a single bond or an alkylene group having 1 to 3 carbon atoms, and one or two or more methylene groups present in the alkylene group are independent as if oxygen atoms are not directly bonded to each other. It may be substituted with an oxygen atom, -CO-, -COO- or -OCO-, and one or more hydrogen atoms present in the alkylene group are independently substituted with a fluorine atom. May be
B ³ and B ⁴ each independently represent an alkyl group having 3 to 11 carbon atoms, and one or more methylene groups present in the alkyl group assume that oxygen atoms do not directly bond to each other. They may be independently substituted with an oxygen atom, -CO-, -COO- or -OCO-, and one or more hydrogen atoms present in the alkyl group are independently fluorine atoms. It may be replaced. )

This composite liquid crystal composition was injected into a glass cell with an ITO electrode having a cell thickness of 10 μm by a vacuum injection method, and the injection port was sealed.

Next, ultraviolet rays were irradiated at a temperature of 1 ° C. to 2 ° C. higher than the isotropic-nematic transition point at an intensity of 50 mW / cm2 for 60 seconds to polymerize the polymerizable compound, and the polymer matrix was obtained from the composite liquid crystal composition. A liquid crystal display element was manufactured by forming a liquid crystal composite film.

Next, the transmittance T0 of the obtained liquid crystal display element was measured in the state where no voltage was applied, and an AC voltage of 60 Hz was applied at a rate of 0.2 V / 3 seconds from this state in which no voltage was applied, and the applied voltage was applied. The voltage-transmittance characteristic was measured as the transmittance T100 (%) when the transmittance did not change any more even if it was increased. The measurement results were T0: 64% and V90: 45V, and as a result, the liquid crystal display element of this example showed good transparency even when no voltage was applied.
(Comparative Example 1)
Each liquid crystal compound having a content (% by mass) of the value shown in Table 1 (total amount of 60 parts by mass) and each polymerizable compound having a content (% by mass) of the value shown in Table 2 (total amount: 39.22 parts by mass). Irgacure 651 (benzyl dimethyl ketal, 0.78 parts by mass) was further mixed as a polymerization initiator to prepare a composite liquid crystal composition.

This composite liquid crystal composition was injected into a glass cell with an ITO electrode having a cell thickness of 10 μm by a vacuum injection method, and the injection port was sealed.

Next, ultraviolet rays are irradiated at a temperature of 1 to 2 ° C. higher than the isotropic-nematic transition point at an intensity of 10 mW / cm2 for 60 seconds to polymerize the polymerizable compound, and the polymer matrix liquid crystal is obtained from the composite liquid crystal composition. A liquid crystal display element was manufactured by forming a composite film.

Next, the voltage-transmittance characteristic of the obtained liquid crystal display element was measured by the method described above. The measurement results were T0: 16% and V90: 9.2V.

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

Claims (6)

A first transparent insulating substrate having a pixel electrode and a second transparent insulating substrate having a common electrode are arranged opposite to each other at regular intervals, and the first transparent insulating substrate having a common electrode and a pixel electrode is placed between the two substrates. On the transparent insulating substrate of
A dimming layer containing a polymer matrix and a liquid crystal composition is arranged and
Place at least one polarizing plate and place
The polymer matrix has nanovoids of 20 nm or more and 400 nm or less.
As the liquid crystal composition, the following general formula (G)

^{(Wherein, R G1} is one or two or more CH ₂ groups in. The alkyl group represents an alkyl group having 1 to 15 carbon atoms, as the oxygen atoms are not directly adjacent, -O-, It may be substituted with −CH = CH−, −CO−, −OCO−, −COO− or −C≡C−, and one or more hydrogen atoms in the alkyl group are optionally substituted with halogen atoms. May have been
A ^G1 and A ^G2 are independent of each other.
(A) Trans-1,4-cyclohexylene group (one CH ₂ group existing in this group or two or more CH _two groups not adjacent to each other may be substituted with an oxygen atom or a sulfur atom. .),
(B) 1,4-phenylene group (one CH group existing in this group or two or more CH groups not adjacent to each other may be substituted with a nitrogen atom), and (c) 1 , 4-Bicyclo (2.2.2) octylene group, naphthalene-2,6-diyl group, naphthalene-3,7-diyl group, decahydronaphthalene-2,6-diyl group, 1,2,3,4 Represents a group selected from the group consisting of a −tetrahydronaphthalene-2,6-diyl group or a chroman-2,6-diyl group, which is included in the above group (a), group (b) or group (c). One or more hydrogen atoms may be substituted with _{fluorine atom, chlorine atom, -CF 3} or -OCF _{3, respectively.}
Z ^G1 is a single bond, -CH = CH -, - CF = CF -, - C≡C -, - CH 2 CH 2 -, - (CH 2) 4 -, - OCH 2 -, - CH 2 O-, Represents -OCF _2- , -CF ₂ O-, -COO- or -OCO-
Y ^G1 represents a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, and an alkyl group having 1 to 15 carbon atoms, and one or more CH ₂ groups in the alkyl group have an oxygen atom directly. It may be replaced with −O−, −CH = CH−, −CO−, −OCO−, −COO−, −C≡C−, −CF ₂ O−, −OCF _{2− so as not to be adjacent to each other.} One or more hydrogen atoms in the alkyl group may optionally be substituted with halogen atoms.
n ^G1 represents an integer from 0 to 4. When n ^G1 represents 2, 3 or 4, and a ^{plurality of AG1s} are present in the general formula (G), the plurality of ^AG1s may be the same or different, and a ^{plurality of ZG1s} are present. In this case, a plurality of Z ^G1s may be the same or different. ) Is contained, and one or more compounds represented by the following general formula (M) are contained as essential components as the compound represented by the general formula (G).

^{(Wherein, R M1} represents an alkyl group having 1 to 8 carbon atoms, one or non-adjacent two or more -CH ₂ in the alkyl group - are each independently -CH = CH -, - It may be replaced by C≡C−, −O−, −CO−, −COO− or −OCO−.
n ^M1 represents 0, 1, 2, 3 or 4
A ^M1 and ^{A M2} are each independently
(A) 1,4-cyclohexylene group (this is present in the group one -CH ₂ - or nonadjacent two or more -CH ₂ - may be replaced by -O- or -S- Good.) And
(B) 1,4-Phenylene group (one -CH = existing in this group or two or more -CH = not adjacent to each other may be replaced with -N =).
Represents a group selected from the group consisting of, and the hydrogen atoms on the above groups (a) and (b) may be independently substituted with cyano groups, fluorine atoms or chlorine atoms, respectively.
Z ^M1 and ^{Z M2} each independently represent a single _{bond, -CH 2 CH 2 -, -} (CH 2) 4 -, - OCH 2 -, - CH 2 O -, - OCF 2 -, - CF 2 O-, Represents −COO−, −OCO− or −C≡C−
When n ^M1 is 2, 3 or 4 and there ^{are a plurality of A M2s} , they may be the same or different, and when n ^M1 is 2, 3 or 4 and there are a plurality of ^{Z M1s.} If so, they may be the same or different,
X ^M1 and X ^M3 independently represent a hydrogen atom, a chlorine atom or a fluorine atom, respectively.
X ^M2 represents a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, a trifluoromethyl group, a fluoromethoxy group, a difluoromethoxy group, a trifluoromethoxy group or a 2,2,2-trifluoroethyl group. )
Used above with the polymerizable compound used for obtaining the polymer matrix, a compound represented by the following general formula (II-b) 1 or two or more,

(In the formula, B ¹ represents a hydrogen atom or a methyl group, and represents
B ² represents a single bond or an alkylene group having 1 to 3 carbon atoms, and one or two or more methylene groups present in the alkylene group are independent as if oxygen atoms are not directly bonded to each other. It may be substituted with an oxygen atom, -CO-, -COO- or -OCO-, and one or more hydrogen atoms present in the alkylene group are independently substituted with a fluorine atom. May be
B ³ and B ⁴ each independently represent an alkyl group having 3 to 11 carbon atoms, and one or more methylene groups present in the alkyl group assume that oxygen atoms do not directly bond to each other. They may be independently substituted with an oxygen atom, -CO-, -COO- or -OCO-, and one or more hydrogen atoms present in the alkyl group are independently fluorine atoms. It may be replaced. )
Said polymer wherein the matrix and polymerizable compound used to obtain the mass ratio of the liquid crystal compounds contained in the liquid crystal composition [Polymerizable compound / liquid crystal compound] is 20 / 80-60 / 40, common to the pixel electrode A liquid crystal display element characterized in that the transmittance of the dimming layer is 100% to 60% when no voltage is applied to the electrodes. A plurality of gate bus lines and data bus lines arranged in a matrix for driving the pixel electrodes on the first substrate,
The liquid crystal display device according to claim 1 and a thin film transistor provided in intersections of the gate bus lines and data bus lines for each pixel. The liquid crystal display element according to claim 1 or 2, wherein the refractive index anisotropy (Δn) of the liquid crystal composition is 0.05 to 0.5. When the pixel electrode and the common electrode are provided on the first transparent insulating substrate, the distance between the electrodes in the horizontal direction to the first transparent insulating substrate: R is opposed to the first transparent insulating substrate and the second transparent insulating substrate. Distance from: The liquid crystal display element according to any one of claims 1 to 3 , wherein G satisfies the relationship of R ≧ G. The invention according to any one of claims 1 to 4 , wherein a passivation film is provided between the first substrate and the dimming layer, or at least one between the second substrate and the dimming layer. Liquid crystal display element. The invention according to any one of claims 1 to 5 , wherein a flattening film is provided between the first substrate and the dimming layer, or at least one between the second substrate and the dimming layer. Liquid crystal display element.

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