JP6269832B2 - Liquid crystal composition and liquid crystal display device using the same - Google Patents

Description

  The present invention relates to a nematic liquid crystal composition having a positive dielectric anisotropy (Δε) useful as a liquid crystal display material, and a liquid crystal display device using the same.

  Liquid crystal display elements are used in various measuring instruments, automobile panels, word processors, electronic notebooks, printers, computers, televisions, watches, advertisement display boards, as well as watches and calculators. Typical liquid crystal display methods include TN (twisted nematic) type, STN (super twisted nematic) type, vertical alignment type using TFT (thin film transistor), and IPS (in-plane switching) type. Alternatively, there are FFS (fringe field switching) type and the like. The main characteristics required of the liquid crystal composition are (1) being stable against external stimuli such as moisture, air, heat, and light, and (2) the liquid crystal phase in the widest possible temperature range centering on room temperature. And (4) low viscosity and (4) low driving voltage. For each display element, dielectric anisotropy (Δε) and refractive index anisotropy (Δn) In general, the liquid crystal composition is composed of several to several tens of kinds of compounds in order to obtain an optimal value. In addition, liquid crystal compositions exhibiting low voltage driving, high-speed response, and a wide operating temperature range in all driving methods such as vertical alignment (VA) type display as well as horizontal alignment type such as TN type, STN type, IPS type and FFS type. Things are sought. Furthermore, in order to set Δn × d, which is the product of Δn and the cell gap (d), to a predetermined value, it is necessary to adjust Δn of the liquid crystal composition to an appropriate range according to the cell gap. When a liquid crystal display element is applied to a television, a display, or the like, high-speed response is important, and therefore a liquid crystal composition having a larger Δn and a smaller rotational viscosity (γ1) than the current one is required. In particular, IPS type and FFS type displays tend to require a wide operating temperature range for mobile applications. Therefore, development of a liquid crystal composition that achieves a high refractive index anisotropy (Δn) and a high nematic-isotropic transition temperature (TNI) with a relatively low viscosity is currently desired.

  Patent document 1 is mentioned as this prior art. Patent Document 1 discloses that a compound having a terphenyl skeleton represented by general formula (I) as an essential component has an extremely low rotational viscosity γ1 and a relatively high optical anisotropy value Δn. ing. Also, in Patent Document 2 which is another prior art, by using the same terphenyl skeleton compound as Patent Document 1 as an essential component, a high upper limit temperature of the nematic phase, a lower lower limit temperature of the nematic phase, a low viscosity, an appropriate There is a description that a plurality of characteristics such as a good optical anisotropy, a low threshold voltage, and a large specific resistance are satisfied.

International Publication No. 2005/007775 Pamphlet International Publication No. 2006/038443 Pamphlet

  As shown in the Examples of Patent Document 1 and Patent Document 2 described above, the conventional compound (D) having the terphenyl skeleton as shown below, and the following formula (B) or the following formula (C In combination with a compound represented by (), the liquid crystal composition has been increased in Δn.

  However, the compound of the formula (B) has a transition temperature of around 0 ° C., and the compound of the formula (C) has a drawback that it has a relatively high transition temperature of around 160 ° C. but has a low compatibility with other liquid crystal compositions. is there. In addition, Δn of the compound of the formula (D), which is an essential component of the above-mentioned patent documents (1) and (2), is as large as around 0.24, but the compatibility with other liquid crystal compositions is poor, and the transition temperature is also low. Since the temperature is around 120 ° C., the physical properties of the liquid crystal composition having a wide nematic temperature range are not sufficient.

  Therefore, the conventional liquid crystal composition simultaneously satisfies the characteristics of the liquid crystal composition necessary for simultaneously achieving high-speed response and a wide operating temperature range, that is, low viscosity, high compatibility, high transition temperature, and high Δn. I couldn't. Therefore, the present invention provides a liquid crystal composition that simultaneously satisfies a high transition temperature and a high Δn while maintaining characteristics required for high-speed response and high compatibility.

  In order to solve the above problems, the present inventors provide a liquid crystal composition containing a phenylnaphthalene compound represented by the general formula (N).

  The liquid crystal composition according to the present invention has low viscosity, high isotropic transition temperature, high compatibility, high refractive index anisotropy, and low deterioration due to heat and light. In addition, it is possible to provide a fast response liquid crystal display element using the liquid crystal composition according to the present invention.

FIG. 1 is a diagram schematically showing an example of the configuration of a liquid crystal display element according to the present invention. FIG. 2 is a diagram schematically showing an example of the configuration of the liquid crystal display element according to the present invention. FIG. 3 is an exploded perspective view schematically showing the structure of one aspect of the liquid crystal display element. 4 is an enlarged plan view of a region II of an electrode layer (also referred to as a thin film transistor layer) including a thin film transistor formed on the substrate in FIG. FIG. 5 is an example of a cross-sectional view of the liquid crystal display element taken along the line III-III in FIG. FIG. 6 is another form of a plan view in which a region II of an electrode layer including a thin film transistor (or also referred to as a thin film transistor layer) formed on the substrate in FIG. 3 is enlarged. 6 is another example of a cross-sectional view of the liquid crystal display element cut at a position in the III-III direction similar to FIG.

  The liquid crystal composition according to the present invention essentially contains a compound represented by the general formula (N). The general formula (N);

(In the general formula (N), L ¹ , L ² , L ³ , L ⁴ and L ⁵ each independently represents a hydrogen atom, a halogen atom or a cyano group,
R ¹ⁿ and R ²ⁿ are each independently an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, a hydrogen atom, a fluorine atom, Represents a cyano group, —CF ₃ or —OCF ₃ ;
Z ¹ⁿ and Z ²ⁿ each independently represent a divalent linking group,
Ring A ¹ and Ring A ² are each independently
(A) a 1,4-cyclohexylene group (one —CH ₂ — present in this group or at least two non-adjacent —CH ₂ — may be replaced by —O—), and ,
(B) a 1,4-phenylene group (one -CH = present in the group or at least two non-adjacent -CH = may be replaced by -N =),
Each of the groups (a) and (b) may be independently substituted with a cyano group, a fluorine atom or a chlorine atom,
a and b each independently represents 0, 1, 2 or 3; ) Is included.

  When the compound represented by the general formula (N) is contained in the liquid crystal composition, it is preferable from the viewpoint of compatibility with other liquid crystal compounds and a transition temperature. The liquid crystal composition containing the compound represented by the general formula (N) is preferably a nematic liquid crystal composition.

In the general formula (N), L ¹ , L ² , L ³ , L ⁴ and L ⁵ are each independently preferably a hydrogen atom or a fluorine atom. Moreover, it is preferable that at least one of L ¹ , L ² , L ³ , L ⁴ and L ⁵ is substituted with a fluorine atom, and either L ¹ or L ^{2 in} the same ring Or any one of L ³ , L ⁴ and L ⁵ is more preferably substituted with a fluorine atom.

In the general formula (N), each of the ring A ¹ⁿ and the ring A ²ⁿ is preferably independently a 1,4-cyclohexylene group or a 1,4-phenylene group.

  The liquid crystal composition according to the present invention can satisfy the low viscosity, high compatibility, high transition temperature, and high Δn at the same time by essentially including the phenylnaphthalene compound represented by the general formula (N). In addition, the fluorinated phenyl naphthalene compound of the present invention has a wide nematic temperature range, a high isotropic transition temperature, and an extremely large refractive index anisotropy. Therefore, the fluorinated phenyl naphthalene compound is particularly suitable for a liquid crystal composition for a mobile FFS type liquid crystal display. Can do. In addition, the novel compound containing the naphthalene skeleton exhibits a nematic phase alone in the range of 40 to 250 ° C., Δn is in the vicinity of 0.24 to 0.38, and when used as a component of a liquid crystal composition Good compatibility.

  In the general formula (N), a + b ≦ 2 is preferable, and b = 0 is more preferable. The compound represented by the general formula (N) under these conditions exhibits a nematic phase alone in the range of 90 to 200 ° C., Δn is near 0.33, and is good when used as a component of a liquid crystal composition. Have good compatibility.

In the general formula (N), Z ¹ⁿ and Z ²ⁿ each independently represent a divalent linking group, specifically, —CH ₂ O—, —OCH ₂ —, —CF ₂ O—, — OCF ₂ —, —CH═CH—, —CF═CF—, —C≡C— or a single bond is preferred, —CH═CH—, —CF═CF—, —C≡C— or a single bond It is more preferable that ^Further, it is preferable that either one of ^{Z 1n} and ^{Z 2n} is a single ^bond, and more preferably ^{Z 1n} and ^{Z 2n} is a single bond.

In the general formula (N) according to the present invention, R ¹ⁿ and R ²ⁿ are each independently preferably an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 8 carbon atoms. The alkyl group is more preferably a straight chain alkyl having 1 to 5 carbon atoms. The alkenyl group is preferably a straight chain alkenyl group having 2 to 8 carbon atoms, more preferably a butenyl group or a pentenyl group. However, when the ring A ¹ or A ² is a cyclohexane ring, an ethenyl group or a propenyl group is more preferable. In the general formula (N) according to the present invention, a nematic liquid crystal phase is stably formed when R ¹ⁿ and R ²ⁿ are linear having 5 or less carbon atoms.

  Alkyl groups are preferred in that they are excellent in heat resistance and light resistance, and the use of a compound having an alkenyl group contributes to improvement in solubility, reduction in viscosity, and increase in elastic constant. Useful for improving.

  In the present specification, examples of the alkenyl group having 2 to 10 carbon atoms include vinyl group, allyl group, 1-propenyl group, isopropenyl group, 2-butenyl group, 3-butenyl group, 1,3-butadienyl group, A 2-pentenyl group, a 3-pentenyl group, a 2-hexenyl group and the like can be mentioned, and a straight chain or branched chain is preferable, and a straight chain is more preferable.

  Examples of the “alkyl group having 1 to 10 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. Group, neopentyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, dodecyl group, pentadecyl group and the like. In the present specification, examples of alkyl groups are common and are appropriately selected from the above examples depending on the number of carbon atoms of each alkyl group. In the present specification, examples of the alkenyl group are common, and the alkenyl group having 2 to 10 carbon atoms according to the present invention is preferably linear or branched, and more preferably linear. More preferable alkenyl groups according to the present invention include the following formula (xi) (vinyl group), formula (xii) (1-propenyl group), formula (xiii) (3-butenyl group) and formula (xiv). ) (3-pentenyl group):

(In the above formulas (i) to (iv), * represents a binding site to the ring structure.)
Examples of the “alkyl group having 1 to 10 carbon atoms” according to the present invention are methyl group, ethyl group, propyl group, butyl group, isopropyl group, isobutyl group, t-butyl group, 3- Examples include a pentyl group, an isopentyl group, a neopentyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, a nonyl group, and a decyl group. In the present specification, examples of alkyl groups are common and are appropriately selected from the above examples depending on the number of carbon atoms of each alkyl group. Further, the alkyl group having 1 to 10 carbon atoms according to the present invention is preferably linear or branched, and more preferably linear.

In the general formula (N), the compound represented by the general formula (N) according to the present invention is preferably such that L ³ , L ⁴ , and L ⁵ are hydrogen atoms.

As the compound represented by the general formula (N) according to the present invention, in the general formula (N), any one of L ^{1 and} L ² is preferably a fluorine atom, and L ³ , L ⁴ , and It is more preferable that L ⁵ is a hydrogen atom, and in the general formula (N), any one of L ^{1 and} L ² is a fluorine atom. A liquid crystal compound having a phenylnaphthalene structure has a very high refractive index anisotropy. However, there is a problem that the viscosity is high when applied to a liquid crystal composition and the compatibility is extremely low. Therefore, the phenylnaphthalene compound according to the present invention, by monofluorination of the benzene ring adjacent to the naphthalene ring, remarkably improves the solubility and further reduces the viscosity without impairing the original excellent characteristics of the phenylnaphthalene skeleton. It is characterized by that.

  The content of the compound represented by the general formula (N) in the liquid crystal composition including the compound represented by the general formula (N) according to the present invention is 0.5 to 23% with respect to the entire liquid crystal composition. Preferably, 0.8-20 mass% is more preferable, 1-18 mass% is further more preferable, and 2-16 mass% is still more preferable.

  Although there is no restriction | limiting in particular in the kind of compound represented by general formula (N), It combines according to desired performance, such as solubility at low temperature, transition temperature, electrical reliability, dielectric constant, birefringence. use. The kind of the compound used is, for example, one kind as one embodiment of the present invention. Or in another embodiment of the present invention, there are two types. Furthermore, in another embodiment of this invention, they are three types. Furthermore, in another embodiment of the present invention, there are four types. Furthermore, in another embodiment of this invention, they are five types. Furthermore, in another embodiment of the present invention, there are six types. Furthermore, in another embodiment of this invention, they are seven or more types.

  Examples of the compound represented by the general formula (N) according to the present invention include at least one compound selected from the group consisting of compounds represented by the following general formulas (N-1) to (N-6). preferable.

(In the above general formulas (N-1) to (N-6), R ¹ⁿ and R ²ⁿ are each independently an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or Represents an alkoxy group having 1 to 10 carbon atoms.)
A liquid crystal compound having a phenylnaphthalene structure has a very high refractive index anisotropy and a high nematic-isotropic transition temperature, but has a problem of high viscosity when applied in a liquid crystal composition and extremely low compatibility. It was. Therefore, the phenylnaphthalene compound according to the present invention, by monofluorination of the benzene ring adjacent to the naphthalene ring, remarkably improves the solubility and further reduces the viscosity without impairing the original excellent characteristics of the phenylnaphthalene skeleton. It is characterized by that.

  When compatibility as a liquid crystal composition is required, it is preferable to use the formula (N-1) and / or the formula (N-2). When a high liquid crystal upper limit temperature range is required, the formula (N-5) ) And / or formula (N-6) is preferred, and in addition to these, when high refractive index anisotropy and low viscosity are required, formula (N-3) and / or formula (N-4) Among them, it is preferable to include at least one compound from the compound group represented by formula (N-3), and to use a compound other than formula (N-3) in combination according to the required physical properties.

  Among these, the formula (N-2), the formula (N-3) and the formula (N-4) are more preferable, and the formula (N-2), the formula (N-3) and the formula are more preferable. (N-4), and most preferred are formula (N-3) and formula (N-4).

  Specific examples of the compound represented by the general formula (N) include the following formulas (n.1-1) to (n.5-6).

  The content of the compound represented by the formula (n.1) in the liquid crystal composition according to the present invention is preferably 0.5 to 20% by mass, more preferably 1 to 18% by mass, and further 2 to 16% by mass. Preferably, 3-15 mass% is further more preferable, and 4-12 mass% is especially preferable.

  The content of the compound represented by the formula (n.2) in the liquid crystal composition according to the present invention is preferably 0.5 to 20% by mass, more preferably 1 to 18% by mass, and further 2 to 16% by mass. Preferably, 3-15 mass% is further more preferable, and 4-12 mass% is especially preferable.

  The content of the compound represented by the formula (n.3) in the liquid crystal composition according to the present invention is preferably 0.5 to 20% by mass, more preferably 1 to 18% by mass, and further 2 to 16% by mass. Preferably, 3-15 mass% is further more preferable, and 4-12 mass% is especially preferable.

  The content of the compound represented by the formula (n.4) in the liquid crystal composition according to the present invention is preferably 0.5 to 20% by mass, more preferably 1 to 18% by mass, and further 2 to 16% by mass. Preferably, 3-15 mass% is further more preferable, and 4-12 mass% is especially preferable.

  The liquid crystal composition according to the present invention may further contain a compound represented by the following general formula (M), and the compound represented by the general formula (M) is a polar compound (with a dielectric anisotropy of +5 to +5). +30) is preferred.

  The general formula (M) according to the present invention is

(In the general formula (M), R ^M1 is an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an alkenyl having 2 to 8 carbon atoms. Represents an oxy group, and one or more hydrogen atoms in the alkyl group, alkenyl group, alkoxy group or alkenyloxy group may be substituted with a fluorine atom, the alkyl group, alkenyl group, alkoxy group or alkenyloxy group One or two or more non-adjacent —CH ₂ — therein are each independently replaced by —CH═CH—, —C≡C—, —O—, —CO—, —COO— or —OCO—. May have been
PM represents 0, 1, 2, 3 or 4;
C ^M1 and C ^M2 are each independently
(D) 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- And (e) a 1,4-phenylene group (one —CH═ present in this group or two or more —CH═ not adjacent to each other may be replaced by —N═).
Represents a group selected from the group consisting of the above-mentioned groups (d) and (e) each independently substituted with a cyano group, a fluorine atom or a chlorine atom,
K ^M1 and K ^M2 are each independently a single bond, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —OCH ₂ —, —CH ₂ O—, —OCF ₂ —, —CF ₂ O—, -COO-, -OCO- or -C≡C-
When PM is 2, 3 or 4 and there are a plurality of K ^M1 , they may be the same or different, and when PM is 2, 3 or 4 and there are a plurality of C ^M2 They may be the same or different,
X ^M1 and X ^M3 each independently represent a hydrogen atom, a chlorine atom or a fluorine atom,
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. However, the compound represented by the general formula (L) is excluded. ).

  There is no particular limitation on the type of compound represented by the general formula (M) that can be combined as the second component, but solubility at low temperatures, transition temperature, electrical reliability, dielectric constant, birefringence, etc. Are used in combination according to the desired performance. The kind of the compound used is, for example, one kind as one embodiment of the present invention. Or in another embodiment of the present invention, there are two types. Furthermore, in another embodiment of this invention, they are three types. Furthermore, in another embodiment of the present invention, there are four types. Furthermore, in another embodiment of this invention, they are five types. Furthermore, in another embodiment of the present invention, there are six types. Furthermore, in another embodiment of this invention, they are seven or more types.

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

  Content of the compound represented by the said general formula (M) is 0.5-70 mass% as one embodiment of this invention with respect to the total mass of the liquid-crystal composition of this invention. Further, for example, in another embodiment of the present invention, the content of the compound is 1% to 65% by mass. For example, in still another embodiment of the present invention, the content of the compound is 1% to 60% by mass. For example, in still another embodiment of the present invention, the content of the compound is 1% to 55% by mass. For example, in still another embodiment of the present invention, the content of the compound is 1% to 47% by mass. For example, in still another embodiment of the present invention, the content of the compound is 1% to 40% by mass. For example, in still another embodiment of the present invention, the content of the compound is 1% to 35% by mass. For example, in still another embodiment of the present invention, the content of the compound is 1% to 30% by mass. For example, in still another embodiment of the present invention, the content of the compound is 1% to 25% by mass. For example, in still another embodiment of the present invention, the content of the compound is 1% to 20% by mass. For example, in still another embodiment of the present invention, the content of the compound is 1% to 10% by mass. For example, in still another embodiment of the present invention, the content of the compound is 1% to 9% by mass. For example, in still another embodiment of the present invention, the content of the compound is 3% to 54% by mass. For example, in still another embodiment of the present invention, the content of the compound is 9% to 54% by mass. For example, in still another embodiment of the present invention, the content of the compound is 19% to 54% by mass. For example, in still another embodiment of the present invention, the content of the compound is 26% to 54% by mass. For example, in still another embodiment of the present invention, the content of the compound is 31% to 54% by mass. For example, in still another embodiment of the present invention, the content of the compound is 39% to 54% by mass. For example, in still another embodiment of the present invention, the content of the compound is 46% to 54% by mass. For example, in still another embodiment of the present invention, the content of the compound is 3% to 8% by mass. For example, in still another embodiment of the present invention, the content of the compound is 19% to 25% by mass. For example, in still another embodiment of the present invention, the content of the compound is 28% to 35% by mass. For example, in still another embodiment of the present invention, the content of the compound is 33% to 42% by mass.

  When the liquid crystal composition of the present invention maintains a low viscosity and a liquid crystal composition having a high response speed is required, it is preferable to lower the lower limit and lower the upper limit. Furthermore, when the liquid crystal composition of the present invention maintains a high Tni and a liquid crystal composition with good temperature stability is required, it is preferable to lower the lower limit and lower the upper limit. Further, when it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable to increase the upper limit value while increasing the lower limit value.

R ^M1 is a linear alkyl group having 1 to 5 carbon atoms or a linear alkoxy group having 1 to 4 carbon atoms when the ring structure to which R ^M1 is bonded is a phenyl group (aromatic). And when the ring structure to which it is bonded is a saturated ring structure such as cyclohexane, pyran and dioxane, a linear alkyl group having 1 to 5 carbon atoms, A straight-chain alkoxy group having 1 to 4 carbon atoms and a straight-chain alkenyl group having 2 to 5 carbon atoms are preferred.

  The compound represented by the general formula (M) according to the present invention preferably has no chlorine atom in the molecule when chemical stability of the liquid crystal composition is required. Further, the compound having a chlorine atom in the liquid crystal composition is preferably 5% or less, preferably 3% or less, preferably 1% or less, preferably 0.5% or less, It is preferable not to contain substantially. “Substantially not contained” means that only a compound containing a chlorine atom is mixed into the liquid crystal composition without intentionally forming a compound or the like generated as an impurity during the production of the compound.

  The compound represented by the general formula (M) according to the present invention is represented by the general formula (B):

(In the general formula (B), R ³ is an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an alkenyl having 2 to 8 carbon atoms. Represents an oxy group, and one or more hydrogen atoms in the alkyl group, alkenyl group, alkoxy group or alkenyloxy group may be substituted with a fluorine atom, the alkyl group, alkenyl group, alkoxy group or alkenyloxy group The methylene group therein may be substituted with an oxygen atom as long as the oxygen atoms are not continuously bonded, and may be substituted with a carbonyl group unless the carbonyl group is bonded continuously,
A ² is each independently 1,4-cyclohexylenecyclohexylene group, 1,4-phenylene group, tetrahydropyran-2,5-diyl group, dioxane-2,5-diyl group or pyrimidine-2,5- Represents a diyl group, and when A ¹ represents a 1,4-phenylene group, one or more hydrogen atoms in the 1,4-phenylene group may be substituted with fluorine atoms,
Each Z ² independently represents a single bond, —OCH ₂ —, —OCF ₂ —, —CH ₂ O— or —CF ₂ O—;
Y ¹ and Y ² each independently represent a fluorine atom or a hydrogen atom, X ¹ represents a fluorine atom, a —CN group or a —OCF ₃ group,
m ¹ represents ¹ , 2, 3 or 4. )
It is preferable that it is a compound represented by these. In the compound represented by formula (B) according to the present invention, m ¹ is preferably 2 or 3. When m ¹ is 2, there is a characteristic of a lower driving voltage. Further, when m ¹ is 3, there is a characteristic of a higher transition temperature.

  The compound represented by the general formula (M) according to the present invention is preferably a compound represented by the general formula (X).

(In the general formula (X), X ¹⁰¹ to X ¹⁰⁴ each independently represents a fluorine atom or a hydrogen atom, Y ¹⁰ represents a fluorine atom, a chlorine atom, or —OCF ₃ , and Q ¹⁰ represents a single bond or —CF ₂ O- represents, R ¹⁰ 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 A ¹⁰¹ and A ¹⁰² are each independently 1,4-cyclohexylene group, 1,4-phenylene group or

In this case, the hydrogen atom on the 1,4-phenylene group may be substituted with a fluorine atom. )
The compounds that can be combined in the compound represented by the general formula (X) are not particularly limited, but are appropriately combined in consideration of solubility at low temperature, transition temperature, electrical reliability, birefringence, and the like. For example, in one embodiment of the present invention, there is one. In another embodiment of the present invention, there are two types. In yet another embodiment, there are three types. In still another embodiment, there are four types. In still another embodiment, there are five or more types.

  The content of the compound represented by the general formula (X) is appropriately adjusted for each embodiment in consideration of properties such as solubility at low temperatures, transition temperature, electrical reliability, and birefringence. For example, the content of the compound represented by the general formula (X) is 1 to 35% by mass in one embodiment of the present invention with respect to the total mass of the liquid crystal composition of the present invention, and in another embodiment. 1-30% by weight in yet another embodiment, 1-25% by weight in yet another embodiment, 1-24% by weight in yet another embodiment, 1-20% by weight in yet another embodiment, and yet another embodiment 1 to 19% by weight, yet another embodiment 1 to 16% by weight, yet another embodiment 1 to 12% by weight, yet another embodiment 1 to 10% by weight, yet another In an embodiment, the content is 1 to 8% by mass, and in still another embodiment, the content is 1 to 3% by mass. In still another embodiment, the content is 3 to 24% by mass, and still another embodiment. Then, the content is 6 to 24% by mass, and yet another In the form, the content is 11-24% by weight, in still another embodiment the content is 13-24% by weight, in yet another embodiment the content is 15-24% by weight, and in yet another embodiment The content is 17 to 24% by weight, and in still another embodiment, the content is 3 to 7% by weight. In still another embodiment, the content is 5 to 10% by weight, and in still another embodiment, the content is 6-9% by weight, in yet another embodiment F the content is 8-11% by weight, in yet another embodiment the content is 11-19% by weight, and in yet another embodiment the content Is 15-19% by weight, and in yet another embodiment the content is 17-20% by weight.

  When the liquid crystal composition of the present invention maintains a low viscosity and a liquid crystal composition having a high response speed is required, it is preferable to lower the lower limit and lower the upper limit. Furthermore, when a liquid crystal composition that does not easily cause burn-in 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 driving voltage low, it is preferable to increase the upper limit value while increasing the lower limit value.

  The compound represented by the general formula (M) according to the present invention is preferably a compound represented by the general formula (X-1).

(In the general formula (X-1), X ¹⁰¹ to X ¹⁰³ and R ¹⁰ have the same meaning as in the general formula (X).)
Although there is no restriction | limiting in particular in the compound which can be combined, It combines suitably for every embodiment in consideration of solubility at low temperature, transition temperature, electrical reliability, birefringence, etc. For example, in one embodiment of the present invention, there is one. In another embodiment of the present invention, there are two types. In yet another embodiment, there are three types. In still another embodiment, there are four types. In still another embodiment, there are five or more types.

  The content of the compound represented by the general formula (X-1) is appropriately adjusted in consideration of properties such as solubility at low temperatures, transition temperature, electrical reliability, and birefringence.

  For example, the content of the compound represented by the general formula (X-1) is 1 to 20% by mass in one embodiment of the present invention with respect to the total mass of the liquid crystal composition of the present invention. 1-15% by weight in a form, 1-10% by weight in yet another embodiment, 1-7% by weight in yet another embodiment, 2-7% by weight in yet another embodiment, and yet another 2 to 57% by weight in an embodiment, 1 to 3% by weight in yet another embodiment, 3 to 9% by weight in yet another embodiment, 6 to 9% by weight in yet another embodiment, and further In another embodiment it is 3-7% by weight, and in yet another embodiment 6-7% by weight.

  Furthermore, the compound represented by General Formula (X-1) according to the present invention is preferably a compound represented by General Formula (X-1-1).

(In the general formula (X-1-1), R ¹⁰ represents the same meaning as in the general formula (X).)
The content of the compound represented by the general formula (X-1-1) is appropriately adjusted in consideration of properties such as solubility at low temperatures, transition temperature, electrical reliability, and birefringence.

  The content of the compound represented by the general formula (X-1-1) is 1 to 25% by mass in one embodiment of the present invention relative to the total mass of the liquid crystal composition of the present invention. 1 to 20% by weight in a form, 1 to 15% by weight in yet another embodiment, 1 to 10% by weight in yet another embodiment, 3 to 10% by weight in yet another embodiment, and yet another In embodiment, it is 5-10 mass%.

  Furthermore, the compound represented by the general formula (X-1-1) used in the liquid crystal composition of the present invention is specifically a compound represented by the formula (36.1) to the formula (36.4). Among them, it is preferable to contain a compound represented by formula (36.1) and / or formula (36.2). The content of the compound represented by the formula (36.2) is preferably 2% by mass to 5% by mass with respect to the total mass of the liquid crystal composition of the present invention.

  Furthermore, it is preferable that the compound represented by general formula (X-1) used for the liquid-crystal composition of this invention is a compound represented by general formula (X-1-2).

(In the general formula (X-1-2), R ¹⁰ 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.)
The content of the compound represented by the general formula (X-1-2) is preferably 1% by mass or more, more preferably 2% by mass or more, based on the total amount of the liquid crystal composition of the present invention. The mass% or more is more preferable. In consideration of solubility at low temperatures, transition temperature, electrical reliability, etc., the maximum ratio is preferably 20% by mass or less, more preferably 16% by mass or less, and even more preferably 12% by mass or less. 10 mass% or less is especially preferable.

  Further, the compound represented by the general formula (X-1-2) is specifically preferably a compound represented by the formula (37.1) to the formula (37.4). It is preferable to contain the compound represented by 37.2). The content of the compound represented by the formula (37.2) is preferably 2% by mass or more and 7% by mass or less with respect to the total mass of the liquid crystal composition of the present invention.

  Furthermore, the compound represented by General Formula (X-1) according to the present invention is preferably a compound represented by General Formula (X-1-3).

(In the general formula (X-1-3), R ¹⁰ 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.)
There are no particular limitations on the compounds that can be combined, but it is preferable to combine one or more of them in consideration of solubility at low temperatures, transition temperature, electrical reliability, birefringence, and the like.

  The content of the compound represented by the general formula (X-1-3) is preferably 1% by mass or more, more preferably 2% by mass or more, based on the total amount of the liquid crystal composition of the present invention. The mass% or more is more preferable. In consideration of solubility at low temperatures, transition temperature, electrical reliability, etc., the maximum ratio is preferably 20% by mass or less, more preferably 16% by mass or less, and even more preferably 12% by mass or less. 10 mass% or less is especially preferable.

Furthermore, the compound represented by the general formula (X-1-3) used in the liquid crystal composition of the present invention is specifically a compound represented by the formula (38.1) to the formula (38.4). In particular, it is preferable to contain a compound represented by the formula (38.2). The content of the compound represented by the formula (38.2) is preferably 2% by mass or more and 7% by mass or less with respect to the total mass of the liquid crystal composition of the present invention.

  Furthermore, the compound represented by General Formula (X-1) according to the present invention is preferably a compound represented by General Formula (X-1-4).

(In the general formula (X-1-4), R ¹⁰ 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.)
Furthermore, the compound represented by the general formula (X-1-4) used in the liquid crystal composition of the present invention is specifically a compound represented by the formula (38.5) to the formula (38.8). It is preferable that

  The compound represented by the general formula (X) according to the liquid crystal composition of the present invention is preferably a compound represented by the general formula (X-2).

(In the general formula ^(X-2), represents the ^{X 103} from ^{X 102} each independently a fluorine atom or a hydrogen ^{atom, Y 10} represents a fluorine atom, a chlorine atom, a -OCF ^{_3, R 10} is the number of carbon atoms Represents an alkyl group having 1 to 5, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.)
There are no particular limitations on the compounds that can be combined, but it is preferable to combine one or more of them in consideration of solubility at low temperatures, transition temperature, electrical reliability, birefringence, and the like.

  Furthermore, the compound represented by General Formula (X-2) according to the present invention is preferably a compound represented by General Formula (X-2-1).

(In the general formula (X-2-1), R ¹⁰ 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.)
There are no particular limitations on the compounds that can be combined, but it is preferable to combine one or more types in consideration of solubility at low temperatures, transition temperature, electrical reliability, birefringence, etc. It is more preferable to combine more than one type.

  The content of the compound represented by the general formula (X-2-1) is preferably 1% by mass or more, more preferably 2% by mass or more, based on the total amount of the liquid crystal composition of the present invention. The mass% or more is more preferable. In consideration of solubility at low temperatures, transition temperature, electrical reliability, etc., the maximum ratio is preferably 20% by mass or less, more preferably 16% by mass or less, and even more preferably 12% by mass or less. 10 mass% or less is especially preferable.

  Furthermore, the compound represented by the general formula (X-2-1) used in the liquid crystal composition of the present invention is specifically a compound represented by the formula (39.1) to the formula (39.4). In particular, it is preferable to contain a compound represented by the formula (39.2). The content of the compound represented by the formula (39.2) is preferably 2% by mass or more and 7% by mass or less with respect to the total mass of the liquid crystal composition of the present invention.

  Furthermore, the compound represented by General Formula (X-2) according to the present invention is preferably a compound represented by General Formula (X-2-2).

(In the general formula (X-2-2), R ¹⁰ 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.)
There are no particular limitations on the compounds that can be combined, but it is preferable to combine one or more of them in consideration of solubility at low temperatures, transition temperature, electrical reliability, birefringence, and the like. The content of the compound represented by the general formula (X-2-2) is preferably 1% by mass or more, more preferably 2% by mass or more, more preferably 3% by mass with respect to the total amount of the liquid crystal composition of the present invention. % Or more is more preferable. In consideration of solubility at low temperatures, transition temperature, electrical reliability, etc., the maximum ratio is preferably 20% by mass or less, more preferably 16% by mass or less, and even more preferably 12% by mass or less. 10 mass% or less is especially preferable.

  Furthermore, the compound represented by the general formula (X-2-2) used in the liquid crystal composition of the present invention is specifically a compound represented by the formula (40.1) to the formula (40.4). In particular, it is preferable to contain a compound represented by the formula (40.2). The content of the compound represented by the formula (40.2) is preferably 2% by mass or more and 7% by mass or less with respect to the total mass of the liquid crystal composition of the present invention.

  The compound represented by the general formula (M) according to the present invention is preferably a compound represented by the general formula (IIb).

(In the general formula (IIb), R ^3b represents an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or 2 to 8 carbon atoms. Represents an alkenyloxy group, and one or more hydrogen atoms in the alkyl group, alkenyl group, alkoxy group or alkenyloxy group may be substituted with a fluorine atom, the alkyl group, alkenyl group, alkoxy group or alkenyloxy The methylene group in the group may be substituted with an oxygen atom unless oxygen atoms are continuously bonded, and may be substituted with a carbonyl group unless a carbonyl group is bonded continuously;
A ^2b is each independently 1,4-cyclohexylenecyclohexylene group, 1,4-phenylene group, tetrahydropyran-2,5-diyl group, dioxane-2,5-diyl group or pyrimidine-2,5- Represents a diyl group, and when A ^2b represents a 1,4-phenylene group, one or more hydrogen atoms in the 1,4-phenylene group may be substituted with fluorine atoms,
Each Z ^2b independently represents a single bond, —OCH ₂ —, —OCF ₂ —, —CH ₂ O—, or —CF ₂ O—;
m ^2b represents 1, 2, 3 or 4, Y ^3b independently represents a fluorine atom or a hydrogen atom, and X ^1b represents a fluorine atom, a —CN group or a —OCF ₃ group. It is preferable that at least one compound is selected from the compound group represented by (2), and the m ^2b is more preferably 2 or 3.

  The content of the compound represented by the general formula (IIb) is an upper limit value and a lower limit value for each embodiment in consideration of properties such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. There is. For example, in one embodiment of the present invention, the lower limit of the content of the compound is 0.01% with respect to the total amount of the liquid crystal composition of the present invention, 0.05% in another embodiment, and yet another implementation. 0.1% in form, 0.2% in yet another embodiment, 0.3% in yet another embodiment, 0.4% in yet another embodiment, and in yet another embodiment 0.5%. The upper limit of the content of the compound represented by the general formula (IIb) is, for example, 10% in one embodiment of the present invention, 8% in another embodiment, and 2% in another embodiment. In yet another embodiment, it is 1%, in yet another embodiment 0.8%, and in yet another embodiment 0.7%.

  When the compound represented by the general formula (IIa) is included in the liquid crystal composition, not only dielectric properties such as Δε can be secured, but also compatibility with the general formula (L) is not impaired.

  The compound represented by the general formula (X) according to the present invention is preferably a compound represented by the general formula (X-3).

(In the general formula (X-3), X ¹⁰² to X ¹⁰³ each independently represents a fluorine atom or a hydrogen atom, and R ¹⁰ represents an alkyl group having 1 to 5 carbon atoms and an alkenyl having 2 to 5 carbon atoms. Represents a group or an alkoxy group having 1 to 4 carbon atoms.)
There are no particular limitations on the compounds that can be combined, but it is preferable to combine one or more of them in consideration of solubility at low temperatures, transition temperature, electrical reliability, birefringence, and the like. When the compound represented by the general formula (X-3) is included in the liquid crystal composition, not only the dielectric property such as Δε can be secured, but also the compatibility with the first component such as the general formula (L) is not impaired. .

  The content of the compound represented by the general formula (X-3) is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, based on the total amount of the liquid crystal composition of the present invention. 0.3 mass% or more is more preferable. In consideration of solubility at low temperatures, transition temperature, electrical reliability, etc., the maximum ratio is preferably 8% by mass or less, more preferably 5% by mass or less, and even more preferably 2% by mass or less. 1% by mass or less is particularly preferable.

  Furthermore, the compound represented by General Formula (X-3) used in the liquid crystal composition of the present invention is preferably a compound represented by General Formula (X-3-1).

(In the general formula (X-3-1), R ¹⁰ 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.)
In the compound satisfying the general formula (X-3-1), there is no particular limitation on the compound that can be combined, but 1 is considered in consideration of solubility at low temperature, transition temperature, electrical reliability, birefringence and the like. It is preferable to combine two or more species.

  The content of the compound represented by the general formula (X-3-1) is preferably 0.05% by mass or more, more preferably 0.2% by mass or more with respect to the total amount of the liquid crystal composition of the present invention. Preferably, 0.3 mass% or more is more preferable. In consideration of solubility at low temperatures, transition temperature, electrical reliability, etc., the maximum ratio is preferably 5% by mass or less, more preferably 3% by mass or less, and even more preferably 2% by mass or less. 1% by mass or less is particularly preferable.

Furthermore, the compound represented by the general formula (X-3-1) used in the liquid crystal composition of the present invention is specifically a compound represented by the formula (41.1) to the formula (41.4). In particular, it is preferable to contain a compound represented by the formula (41.2). When the compound represented by the above formulas (41.1) to (41.4) is included in the liquid crystal composition, not only dielectric properties such as Δε can be secured, but also compatibility with the nonpolar first component is impaired. Absent. The content of the compound represented by the formula (41.2) is preferably 0.5% by mass or more and 5% by mass or less with respect to the total mass of the liquid crystal composition of the present invention.

  Furthermore, the compound represented by General Formula (X-3) used in the liquid crystal composition of the present invention is preferably a compound represented by General Formula (X-3-1).

(In the general formula (X-3-2), R ¹⁰ 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.)
In the compound satisfying the general formula (X-3-2), there is no particular limitation on the compounds that can be combined, but 1 is considered in consideration of solubility at low temperature, transition temperature, electrical reliability, birefringence and the like. It is preferable to combine two or more species.

  The content of the compound represented by the general formula (X-3-2) is preferably 0.05% by mass or more, more preferably 0.2% by mass or more with respect to the total amount of the liquid crystal composition of the present invention. Preferably, 0.3 mass% or more is more preferable. In consideration of solubility at low temperatures, transition temperature, electrical reliability, etc., the maximum ratio is preferably 5% by mass or less, more preferably 3% by mass or less, and even more preferably 2% by mass or less. 1.5% by mass or less is particularly preferable.

  Furthermore, the compound represented by General Formula (X-3-2) used in the liquid crystal composition of the present invention is specifically a compound represented by Formula (41.5) to Formula (41.8). In particular, it is preferable to contain a compound represented by the formula (41.6). When the compound represented by formula (41.5) to formula (41.7) is included in the liquid crystal composition, not only dielectric properties such as Δε can be secured, but also compatibility with the nonpolar first component is impaired. Absent.

  Furthermore, it is preferable that the compound represented by general formula (X) is a compound represented by general formula (X-4).

In (the general formula ^(X-4), X ¹⁰² represents a fluorine atom or a hydrogen ^{atom, R 10} is an alkyl group having 1 to 5 carbon atoms, 1 alkenyl group or number of carbon atoms of 2 to 5 carbon atoms 4 represents an alkoxy group.)
There are no particular limitations on the compounds that can be combined, but it is preferable to combine one or more types in consideration of solubility at low temperatures, transition temperature, electrical reliability, birefringence, etc. It is more preferable to combine more than one type.

  Furthermore, the compound represented by General Formula (X-4) according to the present invention is preferably a compound represented by General Formula (X-4-1).

(In the general formula (X-4-1), R ¹⁰ 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.)
There are no particular limitations on the compounds that can be combined, but it is preferable to combine one or more types in consideration of solubility at low temperatures, transition temperature, electrical reliability, birefringence, etc. It is more preferable to combine more than one type.

  The content of the compound represented by the general formula (X-4-1) is preferably 2% by mass or more, more preferably 5% by mass or more, based on the total amount of the liquid crystal composition of the present invention. The mass% or more is more preferable. In consideration of solubility at low temperature, transition temperature, electrical reliability, etc., the maximum ratio is preferably 20% by mass or less, more preferably 17% by mass or less, and even more preferably 15% by mass or less. 13 mass% or less is particularly preferable.

  Furthermore, the compound represented by the general formula (X-4-1) used in the liquid crystal composition of the present invention is specifically a compound represented by the formula (42.1) to the formula (42.4). In particular, it is preferable to contain a compound represented by the formula (42.3).

  The compound represented by the general formula (M) according to the present invention is at least one selected from the group consisting of compounds represented by the following general formulas (X-6-1) and (X-6-2). It is preferable that

(In the above general formulas (X-6-1) and (X-6-2), RM1, X ^M12 , X ^M13 , X ^M14 , X ^M15 , X ^M16 , X ^M17, and Y ^M11 represent the above general formula (X Same as -6).)
In the liquid crystal composition according to the present invention, the compound that can be combined in the general formula (X-6-1) is not particularly limited, but solubility at low temperature, transition temperature, electrical reliability, birefringence Considering the rate and the like, for example, one embodiment of the present invention has 1 to 5 types. Or in another embodiment of the present invention, it is 1-4 kinds. Moreover, in another embodiment of this invention, it is 1-3 types. Furthermore, in another embodiment of this invention, it is 1-2 types. Furthermore, in another embodiment of this invention, they are 2-5 types. Furthermore, in another embodiment of this invention, it is 2-4 types. Furthermore, in another embodiment of the present invention, there are two to three types.

  In the liquid crystal composition according to the present invention, the content of the compound represented by the general formula (X-6-1) has characteristics such as low temperature solubility, transition temperature, electrical reliability, and birefringence. Considering each embodiment, there is an upper limit value and a lower limit value. For example, in one embodiment of the present invention, the lower limit of the content is 1% with respect to the total amount of the liquid crystal composition of the present invention, 3% in another embodiment, 4% in yet another embodiment, and further 5% in another embodiment, 6% in yet another embodiment, 7% in yet another embodiment, and 8% in yet another embodiment. In still another embodiment, it is 9%.

  In the liquid crystal composition according to the present invention, the upper limit of the content of the compound represented by the general formula (X-6-1) is, for example, 30% in one embodiment of the present invention, and another embodiment. 28%, yet another embodiment 27%, yet another embodiment 26%, yet another embodiment 7%, and yet another embodiment 25%.

  In the above general formula (X-6-2), there are no particular limitations on the compounds that can be combined, but in consideration of solubility at low temperatures, transition temperature, electrical reliability, birefringence, etc. One embodiment of the invention is 1 to 5 types. Or in another embodiment of the present invention, it is 1-4 kinds. Moreover, in another embodiment of this invention, it is 1-3 types. Furthermore, in another embodiment of this invention, it is 1-2 types. Furthermore, in another embodiment of this invention, they are 2-5 types. Furthermore, in another embodiment of this invention, it is 2-4 types. Furthermore, in another embodiment of the present invention, there are two to three types.

  The content of the compound represented by the general formula (X-6-2) is an upper limit for each embodiment in consideration of properties such as solubility at low temperatures, transition temperature, electrical reliability, and birefringence. There is a lower limit. The lower limit of the content is, for example, 1% of the total amount of the liquid crystal composition of the present invention in one embodiment of the present invention, 2% in another embodiment, 3% in yet another embodiment, and further 4% in another embodiment, 5% in yet another embodiment, 6% in yet another embodiment, and 8% in yet another embodiment. In still another embodiment, it is 10%.

  The upper limit of the content is, for example, 30% in one embodiment of the present invention, 20% in another embodiment, 13% in yet another embodiment, 10% in yet another embodiment, In yet another embodiment it is 7% and in yet another embodiment 3%.

  Preferable examples of the compound represented by the general formula (X-6-1) according to the present invention are preferably at least one selected from the group consisting of the following formulas (m.1) to (m.20). .

  Preferable examples of the compound represented by the general formula (X-6-2) according to the present invention are preferably at least one selected from the group consisting of the following formulas (m.21) to (m.28). .

  The compound represented by the general formula (M) used in the liquid crystal composition of the present invention is preferably a compound represented by the general formula (IIa).

(In the general formula (IIa), R ^3a is an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an alkyl group having 2 to 8 carbon atoms. Represents an alkenyloxy group, and one or more hydrogen atoms in the alkyl group, alkenyl group, alkoxy group or alkenyloxy group may be substituted with a fluorine atom, the alkyl group, alkenyl group, alkoxy group or alkenyloxy The methylene group in the group may be substituted with an oxygen atom unless oxygen atoms are continuously bonded, and may be substituted with a carbonyl group unless a carbonyl group is bonded continuously;
A ^2a is each independently 1,4-cyclohexylenecyclohexylene group, 1,4-phenylene group, tetrahydropyran-2,5-diyl group, dioxane-2,5-diyl group or pyrimidine-2,5- Represents a diyl group, and when A ^2a represents a 1,4-phenylene group, one or more hydrogen atoms in the 1,4-phenylene group may be substituted with fluorine atoms,
Each Z ^2a independently represents a single bond, —OCH ₂ —, —OCF ₂ —, —CH ₂ O—, or —CF ₂ O—;
m ^2a represents 1, 2, 3 or 4, Y ^3a independently represents a fluorine atom or a hydrogen atom, and X ^1a represents a fluorine atom, a —CN group or a —OCF ₃ group. It is preferable that at least one kind of compound is selected from the compound group represented by the formula (IIa), and it is more preferable that at least two kinds of compounds are selected from the compound represented by the general formula (IIa). In the general formula (IIa), m ^2a is more preferably ² , 3 or 4, more preferably m ^2a is 2 or 3, and particularly preferably m ^2a is 3.

  It was confirmed that the compatibility was remarkably improved by the combination of the compounds having the common chemical skeleton or the chemical skeleton characteristics.

  The content of the compound represented by the general formula (IIa) is an upper limit value and a lower limit value for each embodiment in consideration of properties such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. There is. The lower limit of the content of the compound is, for example, 2% with respect to the total amount of the liquid crystal composition of the present invention in one embodiment of the present invention, 3% in another embodiment, and 4% in yet another embodiment. In yet another embodiment, 5%, in yet another embodiment 6%, in yet another embodiment 7%, and in yet another embodiment 8%. In other embodiments, it is 9%. 11% in yet another embodiment, 15% in yet another embodiment, and 18% in yet another embodiment. The upper limit of the content of the compound represented by the general formula (IIa) is, for example, 30% in one embodiment of the present invention, 20% in another embodiment, and 13% in still another embodiment. In yet another embodiment, it is 10%, in yet another embodiment 7%, and in yet another embodiment 3%.

  Furthermore, the compound represented by the general formula (X) is preferably a compound selected from the group represented by the general formula (XI).

(In the above general formula (XI), X ¹¹¹ to X ¹¹⁷ each independently represents a fluorine atom or a hydrogen atom, at least one of X ¹¹¹ to X ¹¹⁷ represents a fluorine atom, and R ¹¹ has 1 to 1 carbon atoms. 5 represents an alkyl group, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and Y ¹¹ represents a fluorine atom or —OCF _3. )
There are no particular limitations on the compounds that can be combined, but it is preferable to combine one to three or more in consideration of solubility at low temperatures, transition temperature, electrical reliability, birefringence, and the like.

  When the compound represented by the general formula (XI) is present in the liquid crystal composition, it was confirmed that a high transition point, a large Δε dielectric constant, a high Δn, and a tetracyclic compound exhibit low viscosity.

  The content of the compound represented by the general formula (XI) is an upper limit value and a lower limit value for each embodiment in consideration of properties such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. There is. For example, in one embodiment of the present invention, the lower limit of the content is 2% with respect to the total amount of the liquid crystal composition of the present invention, 4% in another embodiment, 5% in still another embodiment, Yet another embodiment is 7%, yet another embodiment is 9%, yet another embodiment is 10%, and yet another embodiment is 12%. In still another embodiment, it is 13%. In still another embodiment, it is 15%. In yet another embodiment, it is 18%.

  The upper limit of the content is, for example, 30% in one embodiment of the present invention, 25% in another embodiment, 20% in still another embodiment, 15% in yet another embodiment, In yet another embodiment it is 10% and in yet another embodiment 5%.

  When the liquid crystal composition of the present invention is used for a liquid crystal display device having a small cell gap, it is suitable to increase the content of the compound represented by the general formula (XI). When used for a liquid crystal display element with a low driving voltage, it is suitable to increase the content of the compound represented by the general formula (XI). 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 (XI). In the case of a liquid crystal composition 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 (XI).

  Note that the cell gap in this specification refers to an average distance between opposing alignment layers, in other words, an average thickness of a liquid crystal layer filled with a liquid crystal composition (for example, the thickness is calculated by an average of 10 points). .

  Furthermore, it is preferable that the compound represented by general formula (XI) used for the liquid-crystal composition of this invention is a compound represented by general formula (XI-1).

(In the general formula (XI-1), R ¹¹ 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.)
Although there is no restriction | limiting in particular in the compound which can be combined, In consideration of solubility at low temperature, transition temperature, electrical reliability, birefringence, etc., it combines suitably for every embodiment. For example, in one embodiment of the present invention, one type is combined, in another embodiment, two types, and in another embodiment, three or more types are combined.

  In the compound represented by the general formula (XI-1), it is considered that the fluorine in the second benzene ring from the left particularly contributes to the compatibility, and has a high transition point, a large Δε dielectric constant, It was confirmed that a high Δn and a tetracyclic compound showed low viscosity. Therefore, it was confirmed that the compound represented by the general formula (XI-1) exhibits good compatibility with the composition containing the compound represented by the general formula (i) or the general formula (M-1). It was.

  The content of the compound represented by the general formula (XI-1) is preferably 1% by mass or more, more preferably 2% by mass or more, and more preferably 3% by mass or more with respect to the total amount of the liquid crystal composition of the present invention. Is more preferable, more preferably 4% by mass or more, and particularly preferably 5% by mass or more. In consideration of solubility at low temperature, transition temperature, electrical reliability, etc., the maximum ratio is preferably 20% by mass or less, more preferably 15% by mass or less, and even more preferably 12% by mass or less. 10 mass% or less is especially preferable.

  Furthermore, the compound represented by the general formula (XI-1) used in the liquid crystal composition of the present invention is specifically a compound represented by the formula (45.1) to the formula (45.4). Among them, it is preferable to contain the compounds represented by the formulas (45.2) to (45.4), and the compounds represented by the formulas (45.2) and (45.3) are preferably contained. It is more preferable. The content of the compounds represented by the formulas (45.2) and (45.3) is preferably 2% by mass or more and 8% by mass or less based on the total mass of the liquid crystal composition of the present invention.

  The content of the compounds represented by the above formulas (45.1) to (45.4) is preferably 1% by mass or more, and 1.5% by mass with respect to the total amount of the liquid crystal composition of the present invention. The above is more preferable, 2% by mass or more is further preferable, 2.5% by mass or more is further preferable, and 3% by mass or more is particularly preferable. In consideration of solubility at low temperatures, transition temperature, electrical reliability, etc., the maximum ratio is preferably limited to 18% by mass or less, more preferably 15% by mass or less, and even more preferably 12% by mass or less. 10 mass% or less is especially preferable.

  Furthermore, the compound represented by the general formula (X) is preferably a compound selected from the group represented by the general formula (XII).

(In the general formula (XII), X ¹²¹ to X ¹²⁶ each independently represents a fluorine atom or a hydrogen atom, and R ¹² represents an alkyl group having 1 to 5 carbon atoms and an alkenyl group having 2 to 5 carbon atoms. Or represents an alkoxy group having 1 to 4 carbon atoms, and Y ¹² represents a fluorine atom or —OCF _3. )
There are no particular limitations on the compounds that can be combined, but it is preferable to combine one to three or more in consideration of solubility at low temperatures, transition temperature, electrical reliability, birefringence, and the like. It is more preferable to combine more than one type.

  Furthermore, it is preferable that the compound represented by general formula (XII) used for the liquid-crystal composition of this invention is a compound represented by general formula (XII-1).

(In the general formula (XII-1), R ¹² 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.)
There are no particular limitations on the compounds that can be combined, but it is preferable to combine one or more types in consideration of solubility at low temperatures, transition temperature, electrical reliability, birefringence, etc. It is more preferable to combine more than one type.

  The content of the compound represented by the general formula (XII-1) is preferably 1% by mass or more, more preferably 2% by mass or more, and more preferably 3% by mass or more with respect to the total amount of the liquid crystal composition of the present invention. Is more preferable, and 4% by mass or more is particularly preferable. In consideration of solubility at low temperatures, transition temperature, electrical reliability, etc., the maximum ratio is preferably 15% by mass or less, more preferably 10% by mass or less, and even more preferably 8% by mass or less. 6 mass% or less is particularly preferable.

  Furthermore, the compound represented by the general formula (XII-1) used in the liquid crystal composition of the present invention is specifically a compound represented by the formula (46.1) to the formula (46.4). Among them, it is preferable to contain a compound represented by formula (46.2) to formula (46.4).

  Furthermore, it is preferable that the compound represented by general formula (XII) is a compound represented by general formula (XII-2).

(In the general formula (XII-2), R ¹² 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.)
There are no particular limitations on the compounds that can be combined, but it is preferable to combine one or more types in consideration of solubility at low temperatures, transition temperature, electrical reliability, birefringence, etc. It is more preferable to combine more than one type.

  The content of the compound represented by the general formula (XII-2) is preferably 1% by mass or more, more preferably 3% by mass or more, with respect to the total amount of the liquid crystal composition of the present invention, and 4% by mass or more. Is more preferably 6% by mass or more, and particularly preferably 9% by mass or more. In consideration of solubility at low temperature, transition temperature, electrical reliability, etc., the maximum ratio is preferably 20% by mass or less, more preferably 17% by mass or less, and even more preferably 15% by mass or less. 13 mass% or less is particularly preferable.

  Furthermore, the compound represented by the general formula (XII-2) used in the liquid crystal composition of the present invention is specifically a compound represented by the formula (47.1) to the formula (47.4). Among them, it is preferable to contain a compound represented by formula (47.2) to formula (47.4).

  Furthermore, the compound represented by General Formula (XII) according to the present invention is preferably a compound represented by General Formula (X-5).

(In the general formula ^(X-5), X ¹⁰² represents a fluorine atom or a hydrogen ^{atom, R 10} is an alkyl group having 1 to 5 carbon atoms, 1 alkenyl group or number of carbon atoms of 2 to 5 carbon atoms 4 represents an alkoxy group.)
There are no particular limitations on the compounds that can be combined, but it is preferable to combine one or more types in consideration of solubility at low temperatures, transition temperature, electrical reliability, birefringence, etc. It is more preferable to combine more than one type.

  Furthermore, the compound represented by General Formula (X-5) used in the liquid crystal composition of the present invention is preferably a compound represented by General Formula (X-5-1).

(In the general formula (X-5-1), R ¹⁰ 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.)
There are no particular limitations on the compounds that can be combined, but it is preferable to combine one or more types in consideration of solubility at low temperatures, transition temperature, electrical reliability, birefringence, etc. It is more preferable to combine more than one type.

  Furthermore, the compounds represented by the general formula (X-5-1) used in the liquid crystal composition of the present invention are specifically compounds represented by the formulas (43.1) to (43.4). In particular, it is preferable to contain a compound represented by the formula (43.2).

  The content of the compounds represented by the formulas (43.1) to (43.4) is preferably 1% by mass or more, and preferably 2% by mass or more with respect to the total amount of the liquid crystal composition of the present invention. More preferred is 3% by mass or more. In consideration of solubility at low temperatures, transition temperature, electrical reliability, etc., the maximum ratio is preferably limited to 18% by mass or less, more preferably 15% by mass or less, and even more preferably 12% by mass or less. 10 mass% or less is especially preferable.

  The compound represented by the general formula (M) according to the present invention is preferably, for example, a compound selected from the group of compounds represented by the general formula (VIII).

(In the general formula (VIII), R ⁸ 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 ⁸¹ to X ⁸⁵ are Each independently represents a hydrogen atom or a fluorine atom, and Y ⁸ represents a fluorine atom or —OCF _3. )
Although there is no restriction | limiting in particular in the kind of compound which can be combined, According to desired performances, such as low temperature solubility, transition temperature, electrical reliability, birefringence, it uses suitably combining. The kind of the compound used is, for example, one kind as one embodiment of the present invention. Or in another embodiment of the present invention, there are two types. Furthermore, in another embodiment of this invention, they are three or more types. When the compound represented by the general formula (VIII) is present in the liquid crystal composition, it exhibits high Δn, and has an effect that the transition point can be easily controlled by adjusting the ratio with other tetracyclic compounds.

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

  The content of the compound represented by the general formula (VIII) with respect to the total mass of the liquid crystal composition of the present invention is, for example, 1 to 25% by mass in one embodiment of the present invention. Furthermore, for example, in another embodiment of the present invention, the content of the compound is 1% to 20% by mass. For example, in still another embodiment of the present invention, the content of the compound is 1% to 15% by mass. For example, in still another embodiment of the present invention, the content of the compound is 1% to 10% by mass. For example, in still another embodiment of the present invention, the content of the compound is 1% to 5% by mass. For example, in still another embodiment of the present invention, the content of the compound is 3% to 7% by mass. For example, in still another embodiment of the present invention, the content of the compound is 4% to 7% by mass.

  When the liquid crystal composition of the present invention maintains a low viscosity and a liquid crystal composition having a high response speed is required, it is preferable to lower the lower limit and lower the upper limit. Furthermore, when the liquid crystal composition of the present invention maintains a high Tni and a liquid crystal composition with good temperature stability is required, it is preferable to lower the lower limit and lower the upper limit. Further, when it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable to increase the upper limit value while increasing the lower limit value.

  Furthermore, the compound represented by General Formula (VIII) according to the present invention is preferably a compound represented by General Formula (VIII-1).

(In the above general formula (VIII-1), R ⁸ represents the same meaning as in general formula (VIII).)
Further, the compound represented by the general formula (VIII-1) is specifically preferably a compound represented by the formula (26.1) to the formula (26.4), and the formula (26.1) Or the compound represented by Formula (26.2) is preferable, and the compound represented by Formula (26.2) is more preferable.

  The content of the compounds represented by the above formulas (26.1) to (26.4) is determined according to the present invention in consideration of solubility at low temperatures, transition temperature, electrical reliability, birefringence and the like. It is preferably 1% by mass or more and 25% by mass or less, more preferably 1% by mass or more and 15% by mass or less, still more preferably 1% by mass or more and 10% by mass or less, and more preferably 1% by mass or more and 25% by mass or less. The mass% is preferably 7% by mass or less. In other embodiments, the content is preferably 1% by mass or more and 25% by mass or less.

  Furthermore, it is preferable that the compound represented by general formula (VIII) which concerns on this invention is a compound represented by general formula (VIII-2).

(In the above general formula (VIII-2), R ⁸ represents the same meaning as in general formula (VIII).)
Although there is no restriction | limiting in particular in the kind of compound which can be combined as general formula (VIII-2), It combines suitably according to desired performances, such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. To use. The kind of the compound used is, for example, one kind as one embodiment of the present invention. Or in another embodiment of the present invention, there are two types. Or in another embodiment of this invention, they are three or more types.

  The content of the compound represented by the general formula (VIII-2) is the total mass of the liquid crystal composition of the present invention in consideration of solubility at a low temperature, transition temperature, electrical reliability, birefringence, and the like. Is preferably 2.5% by mass or more and 25% by mass or less, more preferably 8% by mass or more and 25% by mass or less, and preferably 10% by mass or 20% by mass or less, and 12% by mass. It is preferable that it is 15 mass% or less.

  Furthermore, the compound represented by the general formula (VIII-2) is preferably a compound represented by the formula (27.1) to the formula (27.4), and is represented by the formula (27.2). It is preferable that it is a compound.

  Furthermore, it is preferable that the compound represented by general formula (M) which concerns on this invention is a compound chosen from the compound group represented, for example by general formula (IX).

(In the general formula (IX), R ⁹ 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 ⁹¹ and X ⁹² are Each independently represents a hydrogen atom or a fluorine atom, Y ⁹ represents a fluorine atom, a chlorine atom or —OCF ₃ , and U ⁹ represents a single bond, —COO— or —CF ₂ O—.
There are no particular restrictions on the types of compounds that can be combined, but they are used in appropriate combinations according to desired properties such as solubility at low temperatures, transition temperatures, electrical reliability, and birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention. Or in another embodiment of the present invention, it is two or more types.

  The content of the compound represented by the general formula (VIII-3) is the total mass of the liquid crystal composition of the present invention in consideration of solubility at a low temperature, transition temperature, electrical reliability, birefringence, and the like. Is preferably 0.5% by mass or more and 15% by mass or less, preferably 0.5% by mass or more and 10% by mass or less, and more preferably 0.5% by mass or less and 5% by mass or less. It is preferable that they are 1 mass% or more and 5 mass% or less.

  When the liquid crystal composition of the present invention maintains a low viscosity and a liquid crystal composition having a high response speed is required, it is preferable to lower the lower limit and lower the upper limit. Furthermore, when the liquid crystal composition of the present invention requires a high Tni and a liquid crystal composition that does not easily cause burn-in, it is preferable to lower the lower limit and lower the upper limit. Further, when it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable to increase the upper limit value while increasing the lower limit value.

  Furthermore, the compound represented by General Formula (IX) according to the present invention is preferably a compound represented by General Formula (IX-1).

(In the general formula (IX-1), R ⁹ and X ⁹² represent the same meaning as in the general formula (IX).)
Furthermore, it is preferable that the compound represented by general formula (IX-1) which concerns on this invention is a compound represented by general formula (IX-1-1).

(In the above general formula (IX-1-1), R ⁹ represents the same meaning as in general formula (IX).)
There are no particular restrictions on the types of compounds that can be combined, but they are used in appropriate combinations according to desired properties such as solubility at low temperatures, transition temperatures, electrical reliability, and birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention. Or in another embodiment of the present invention, there are two types. Furthermore, in another embodiment of this invention, they are three or more types.

  The content of the compound represented by the general formula (IX-1-1) is appropriately adjusted according to the embodiment in consideration of solubility at a low temperature, transition temperature, electrical reliability, birefringence, and the like. The

  The content of the compound represented by the general formula (IX-1-1) with respect to the total mass of the liquid crystal composition of the present invention is, for example, 1 to 30% by mass as one embodiment of the present invention. . Furthermore, for example, in another embodiment of the present invention, the content of the compound is 2% to 25% by mass. For example, in still another embodiment of the present invention, the content of the compound is 3% to 20% by mass. For example, in still another embodiment of the present invention, the content of the compound is 9% to 15% by mass. For example, in still another embodiment of the present invention, the content of the compound is 12% to 20% by mass.

  Furthermore, the compound represented by the general formula (IX-1-1) is preferably a compound represented by the formula (28.1) to the formula (28.5), and the formula (28.3) or / And a compound represented by formula (28.5). The content of the compound represented by the formula (28.1) to the formula (28.5) with respect to the total mass of the liquid crystal composition of the present invention is, for example, 3 to 15 as one embodiment of the present invention. % By mass.

  Furthermore, the compound represented by General Formula (IX-1) according to the present invention is preferably a compound represented by General Formula (IX-1-2).

(In the above (IX-1-2), R ⁹ represents the same meaning as in general formula (IX).)
Although there is no restriction | limiting in the kind of compound which can be combined, It is preferable to combine 1 type to 3 types in consideration of solubility at low temperature, transition temperature, electrical reliability, birefringence, etc. It is more preferable to combine the four types.

  The content of the compound represented by the general formula (IX-1-2) is based on the total mass of the liquid crystal composition of the present invention in consideration of solubility at a low temperature, transition temperature, electrical reliability, and the like. On the other hand, it is preferably 1% by mass or more and 30% by mass or less, preferably 5% by mass or more and 25% by mass or less, and more preferably 8% by mass or more and 20% by mass or less.

  Further, the compound represented by the general formula (IX-1-2) is preferably a compound represented by the formula (29.1) to the formula (29.4), and the formula (29.2) or / And a compound represented by Formula (29.4).

  Furthermore, the compound represented by General Formula (IX) is preferably a compound represented by General Formula (IX-2).

(In the general formula (IX-2), R ⁹ , X ⁹¹ and X ⁹² represent the same meaning as in the general formula (IX).)
Furthermore, the compound represented by General Formula (IX-2) according to the present invention is preferably a compound represented by General Formula (IX-2-1).

(In the above general formula (IX-2-1), R ⁹ represents the same meaning as in general formula (IX).)
For example, in one embodiment of the present invention, the content of the compound represented by the general formula (IX-2-1) is 1 to 25% by mass with respect to the total mass of the liquid crystal composition of the present invention. is there. In another embodiment, the content of the compound is 1% to 20% by mass. In still another embodiment, the content of the compound is 1% to 15% by mass. In still another embodiment, the content of the compound is 1% to 10% by mass. In still another embodiment, the content of the compound is 1% to 5% by mass. In still another embodiment, the content of the compound is 1% to 4% by mass.

  Further, the compound represented by the general formula (IX-2-1) is preferably a compound represented by the formula (30.1) to the formula (30.4), from the formula (30.1) It is preferable that it is a compound represented by Formula (30.2).

  Furthermore, the compound represented by General Formula (IX-2) according to the present invention is preferably a compound represented by General Formula (IX-2-2).

(In the above general formula (IX-2-2), R ⁹ represents the same meaning as in general formula (IX).)
The content of the compound represented by the general formula (IX-2-2) is appropriately determined for each embodiment in consideration of properties such as solubility at low temperatures, transition temperature, electrical reliability, and birefringence. Adjusted.

  The content of the compound represented by the general formula (IX-2-2) with respect to the total mass of the liquid crystal composition of the present invention is 1 to 30% by mass in one embodiment of the present invention, and another embodiment. 1 to 25% by weight, yet another embodiment 1 to 20% by weight, yet another embodiment 1 to 16% by weight, yet another embodiment 1 to 11% by weight, yet another embodiment. 2 to 17% by weight, yet another embodiment 6 to 17% by weight, yet another embodiment 9 to 17% by weight, yet another embodiment 14 to 17% by weight, yet another 14 to 16% by weight in embodiments, 2 to 9% by weight in yet another embodiment, 6 to 10% by weight in still another embodiment, 8 to 11% by weight in yet another embodiment, and still more In another embodiment, 9-12% by weight. .

  Further, the compound represented by the general formula (IX-2-2) is preferably a compound represented by the formula (31.1) to the formula (31.4), from the formula (31.1) It is preferable that it is a compound represented by Formula (31.4).

  Furthermore, the compound represented by the general formula (IX-2) is preferably a compound represented by the general formula (IX-2-3).

(In the general formula (IX-2-3), R ⁹ represents the same meaning as in the general formula (IX).)
Although there is no restriction | limiting in the kind of compound which can be combined, It is preferable to combine 1-2 types in consideration of solubility at low temperature, transition temperature, electrical reliability, birefringence, etc.

  The content of the compound represented by the general formula (IX-2-3) is based on the total mass of the liquid crystal composition of the present invention in consideration of solubility at a low temperature, transition temperature, electrical reliability, and the like. On the other hand, it is preferably 1% by mass to 30% by mass, more preferably 3% by mass to 20% by mass, further preferably 6% by mass to 15% by mass, and more preferably 8% by mass to 10% by mass. Further preferred.

  Furthermore, the compound represented by the general formula (IX-2-3) is preferably a compound represented by the formula (32.1) to the formula (32.4), and the formula (32.2) and A compound represented by the formula (32.4) is preferable.

  Furthermore, the compound represented by General Formula (IX-2) according to the present invention is preferably a compound represented by General Formula (IX-2-4).

(In the above general formula (IX-2-4), R ⁹ represents the same meaning as in general formula (IX).)
The content of the compound represented by the general formula (IX-2-4) is based on the total mass of the liquid crystal composition of the present invention in consideration of solubility at a low temperature, transition temperature, electrical reliability, and the like. On the other hand, it is preferably 1% by mass to 25% by mass, preferably 1% by mass to 20% by mass, preferably 1% by mass to 15% by mass, and preferably 1% by mass to 12% by mass, 5 mass% or more and 12 mass% or less are preferable, and 7 mass% or more and 12 mass% or less are preferable.

  Further, the compound represented by the general formula (IX-2-4) is preferably a compound represented by the formula (33.1) to the formula (33.8), and the formula (33.1), the formula (33.8) and a compound represented by formula (33.2) to formula (33.5) are more preferable. The content of the compound represented by the formula (33.1) is preferably 3% by mass to 15% by mass with respect to the total mass of the liquid crystal composition of the present invention. The content of the compound represented by the formula (33.3) is preferably 3% by mass or more and 25% by mass or less based on the total mass of the liquid crystal composition of the present invention.

In the above formula (33.8), R ²⁵ is preferably an alkenyl group having 2 to 6 carbon atoms.

  Furthermore, it is preferable that the compound represented by general formula (IX-2) which concerns on this invention is a compound represented by general formula (IX-2-5).

(In the above general formula (IX-2-5), R ⁹ represents the same meaning as in general formula (IX).)
Although there is no restriction | limiting in the kind of compound which can be combined, Considering solubility at low temperature, transition temperature, electrical reliability, birefringence, etc., it uses combining suitably for every embodiment. For example, one embodiment of the present invention has one type, another embodiment has two types, yet another embodiment has three types, and yet another embodiment has four or more types.

  The content of the compound represented by the general formula (IX-2-5) is appropriately determined for each embodiment in consideration of properties such as solubility at low temperatures, transition temperature, electrical reliability, and birefringence. Adjusted.

  For example, the content of the compound represented by the general formula (IX-2-5) is 0.1 to 30% by mass in one embodiment of the present invention with respect to the total mass of the liquid crystal composition of the present invention. , In another embodiment 0.3 to 25% by weight, in yet another embodiment 0.5 to 20% by weight, in yet another embodiment 1 to 15% by weight, and in yet another embodiment 2 to 14 wt%, in yet another embodiment 2.5 to 15 wt%, and in yet another embodiment 3 to 12 wt%.

  When the liquid crystal composition of the present invention maintains a low viscosity and a liquid crystal composition having a high response speed is required, it is preferable to lower the lower limit and lower the upper limit. Furthermore, when the liquid crystal composition of the present invention requires a high Tni and a liquid crystal composition that does not easily cause burn-in, it is preferable to lower the lower limit and lower the upper limit. Further, when it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable to increase the upper limit value while increasing the lower limit value.

  Furthermore, the compound represented by the general formula (IX-2-5) is preferably a compound represented by the formula (34.1) to the formula (34.5), and the formula (34.1), the formula A compound represented by (34.2), formula (34.3) and / or formula (34.5) is preferable. The content of the compounds represented by the formulas (34.3) and (34.6) is preferably 3% by mass to 15% by mass with respect to the total mass of the liquid crystal composition of the present invention.

  Furthermore, the compound represented by General Formula (IX) according to the present invention is preferably a compound represented by General Formula (IX-3).

(In the general formula (IX-3), R ⁹ , X ⁹¹ and X ⁹² represent the same meaning as in the general formula (IX).)
Furthermore, the compound represented by the general formula (IX-3) is preferably a compound represented by the general formula (IX-3-1).

(In the general formula (IX-3-1), R ⁹ represents the same meaning as in the general formula (IX).)
Although there is no restriction | limiting in the kind of compound which can be combined, It is preferable to combine 1-2 types in consideration of solubility at low temperature, transition temperature, electrical reliability, birefringence, etc.

  The content of the compound represented by the general formula (IX-3-1) is based on the total mass of the liquid crystal composition of the present invention in consideration of solubility at a low temperature, transition temperature, electrical reliability, and the like. On the other hand, it is preferably 3% by mass or more and 30% by mass or less, preferably 7% by mass or more and 30% by mass or less, preferably 13% by mass or more and 20% by mass or less, and more preferably 15% by mass or more and 18% by mass or less.

  Furthermore, the compound represented by the general formula (IX-3-1) is preferably a compound represented by the formula (35.1) to the formula (35.4), and the formula (35.1) and / or Or it is preferable that it is a compound represented by Formula (35.2).

  Furthermore, the compound represented by General Formula (M) according to the present invention is preferably a compound selected from the group of compounds represented by General Formula (XIII).

(In the general formula (XIII), X ¹³¹ to X ¹³⁵ each independently represent a fluorine atom or a hydrogen atom, and R ¹³ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or Represents an alkoxy group having 1 to 4 carbon atoms, and Y ¹³ represents a fluorine atom or —OCF _3. )
Although there is no restriction | limiting in particular in the kind of compound which can be combined, It is preferable to contain 1 type-2 types from these compounds, It is more preferable to contain 1 type-3 types, It contains 1 type-4 types. More preferably.

  The content of the compound represented by the general formula (XIII) has an upper limit value and a lower limit value for each embodiment in consideration of properties such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. is there. For example, in one embodiment of the present invention, the lower limit of the content is 2% with respect to the total amount of the liquid crystal composition of the present invention, 4% in another embodiment, 5% in still another embodiment, Yet another embodiment is 7%, yet another embodiment is 9%, yet another embodiment is 11%, and yet another embodiment is 13%. In yet another embodiment, it is 14%. In still another embodiment, it is 16%. In still another embodiment, it is 20%.

  The upper limit of the content is, for example, 30% in one embodiment of the present invention, 25% in another embodiment, 20% in still another embodiment, 15% in yet another embodiment, In yet another embodiment it is 10% and in yet another embodiment 5%.

  When the liquid crystal composition of the present invention is used for a liquid crystal display device having a small cell gap, it is suitable to increase the content of the compound represented by the general formula (XIII). When used for a liquid crystal display element having a low driving voltage, it is suitable to increase the content of the compound represented by the general formula (XIII). In addition, 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 (XIII). In the case of a liquid crystal composition 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 (XIII).

  Furthermore, the compound represented by the general formula (XIII) according to the present invention is preferably a compound represented by the general formula (XIII-1).

(In the general formula (XIII-1), R ¹³ 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.)
The compound represented by the general formula (XIII-1) is preferably contained in an amount of 1% by mass or more, more preferably 3% by mass or more, more preferably 5% by mass or more, based on the total amount of the liquid crystal composition of the present invention. It is more preferable to contain 10% by mass or more. Moreover, as a ratio which can be contained at the maximum, 25 mass% or less is preferable, 20 mass% or less is more preferable, and 15 mass% or less is further more preferable.

  Furthermore, the compound represented by the general formula (XIII-1) is preferably a compound represented by the formula (48.1) to the formula (48.4), and is represented by the formula (48.2). A compound is preferred.

  Furthermore, the compound represented by General Formula (XIII) according to the present invention is preferably a compound represented by General Formula (XIII-2).

(In the general formula (XIII-2), R ¹³ 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.)
Although there is no restriction | limiting in particular in the kind of compound which can be combined, It is preferable to contain 1 type or 2 types or more from these compounds.

  The compound represented by the general formula (XIII-2) is preferably contained in an amount of 5% by mass or more, more preferably 6% by mass or more, and more preferably 8% by mass or more based on the total amount of the liquid crystal composition of the present invention. It is more preferable to contain 10% by mass or more. Moreover, as a ratio which can be contained at the maximum, 25 mass% or less is preferable, 20 mass% or less is more preferable, and 15 mass% or less is further more preferable.

Further, the compound represented by the general formula (XIII-2) is preferably a compound represented by the formula (49.1) to the formula (49.4), and the formula (49.1) or / and the formula A compound represented by (49.2) is preferable. The content of the compound represented by the formula (49.2) is preferably 3% by mass or more and 15% by mass or less with respect to the total mass of the liquid crystal composition of the present invention.

  Furthermore, the compound represented by General Formula (XIII) according to the present invention is preferably a compound represented by General Formula (XIII-3).

(In the general formula (XIII-3), R ¹³ 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.)
Although there is no restriction | limiting in particular in the kind of compound which can be combined, It is preferable to contain 1 type-2 types from these compounds.

  The compound represented by the general formula (XIII-3) is preferably contained in an amount of 2% by mass or more, more preferably 4% by mass or more, more preferably 9% by mass or more based on the total amount of the liquid crystal composition of the present invention. More preferably, it is more preferably 11% by mass or more. Moreover, as a ratio which can be contained at the maximum, 20 mass% or less is preferable, 17 mass% or less is more preferable, and 14 mass% or less is further more preferable.

  Further, the compound represented by the general formula (XIII-3) is preferably a compound represented by the formula (50.1) to the formula (50.4), and the formula (50.1) or / and the formula A compound represented by (50.2) is preferred.

  Furthermore, it is preferable that the compound represented by general formula (M) which concerns on this invention is a compound chosen from the compound group represented by general formula (XIV).

(In the general formula (XIV), R ¹⁴ represents an alkyl group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, or an alkoxy group having 1 to 7 carbon atoms, and X ¹⁴¹ to X ¹⁴⁴ each independently represents a fluorine atom or a hydrogen atom; Y ¹⁴ represents a fluorine atom, a chlorine atom or —OCF ₃ ; Q ¹⁴ represents a single bond, —COO— or —CF ₂ O—, and m ¹⁴ represents 0 or 1)
Although there is no restriction | limiting in the kind of compound which can be combined, It combines suitably for every embodiment in consideration of solubility at low temperature, transition temperature, electrical reliability, birefringence, etc. For example, in one embodiment of the present invention, there is one. Furthermore, in another embodiment of this invention, they are two types. Or in another embodiment of this invention, they are three types. In still another embodiment of the present invention, there are four types. Or in another embodiment of this invention, they are five types. Or in another embodiment of this invention, they are six or more types.

  The content of the compound represented by the general formula (XIV) has an upper limit value and a lower limit value for each embodiment in consideration of properties such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. is there. For example, in one embodiment of the present invention, the lower limit of the content is 3% with respect to the total amount of the liquid crystal composition of the present invention, 7% in another embodiment, 8% in still another embodiment, Yet another embodiment is 11%, yet another embodiment is 12%, yet another embodiment is 16%, and yet another embodiment is 18%. In still another embodiment, it is 19%. In still another embodiment, it is 22%. In still another embodiment, it is 25%.

  The upper limit of the content is, for example, 40% in one embodiment of the present invention, 35% in another embodiment, 30% in yet another embodiment, and 25% in yet another embodiment. In yet another embodiment it is 20% and in yet another embodiment it is 15%.

  When the liquid crystal composition of the present invention is used for a liquid crystal display element having a low driving voltage, it is suitable to increase the content of the compound represented by the general formula (XIV). In the case of a liquid crystal composition 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 (XIV).

  Furthermore, the compound represented by General Formula (XIV) according to the present invention is preferably a compound represented by General Formula (XIV-1).

(In the general formula (XIV-1), R ¹⁴ represents an alkyl group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, or an alkoxy group having 1 to 7 carbon atoms, and Y ¹⁴ represents fluorine. Represents an atom, a chlorine atom or —OCF ₃ )
Although there is no restriction | limiting in the kind of compound which can be combined, It is preferable to combine 1 type to 3 types in consideration of solubility at low temperature, transition temperature, electrical reliability, birefringence, etc.

  Furthermore, it is preferable that the compound represented by general formula (XIV-1) is a compound represented by general formula (XIV-1-1).

(In the general formula (XIV-1), R ¹⁴ represents an alkyl group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, or an alkoxy group having 1 to 7 carbon atoms.)
The content of the compound represented by the general formula (XIV-1) is preferably 2% by mass or more, more preferably 4% by mass or more, and more preferably 7% by mass with respect to the total amount of the liquid crystal composition of the present invention. The above is more preferable, 10% by mass or more is more preferable, and 18% by mass or more is particularly preferable. In consideration of solubility at low temperatures, transition temperature, electrical reliability, etc., the maximum ratio is preferably limited to 30% by mass or less, more preferably 27% by mass or less, and more preferably 24% by mass or less. , Less than 21% by mass is particularly preferable.

  Further, the compound represented by the general formula (XIV-1-1) is specifically preferably a compound represented by the formula (51.1) to the formula (51.4). It is more preferable to contain the compound represented by this.

  Furthermore, it is preferable that the compound represented by general formula (XIV-1) is a compound represented by general formula (XIV-1-2).

(In the general formula (XIV-1-2), R ¹⁴ represents an alkyl group having 1 to 7 carbon atoms, an alkenyl group having 2 to 7 carbon atoms, or an alkoxy group having 1 to 7 carbon atoms.)
The content of the compound represented by the general formula (XIV-1-2) is preferably 1% by mass or more, more preferably 3% by mass or more, more preferably 5% by mass with respect to the total amount of the liquid crystal composition of the present invention. % Or more is more preferable, and 7 mass% or more is particularly preferable. In consideration of solubility at low temperatures, transition temperature, electrical reliability, etc., the maximum ratio is preferably 15% by mass or less, more preferably 13% by mass or less, and even more preferably 11% by mass or less. , Less than 9% by mass is particularly preferable.

  Furthermore, the compound represented by the general formula (XIV-1-2) is specifically preferably a compound represented by the formula (52.1) to the formula (52.4), among which the formula (5 It is preferable to contain the compound represented by 52.4).

  Furthermore, the compound represented by General Formula (XIV) according to the present invention is preferably a compound represented by General Formula (XIV-2).

(In the general formula ^{(XIV-2), R 14} represents an alkyl group, an alkenyl group or an alkoxy group having 1 to 4 carbon atoms 2 to 5 carbon atoms of 1 to 5 carbon ^atoms, from ^{X 141} X ¹⁴⁴ each independently represents a fluorine atom or a hydrogen atom, and Y ¹⁴ represents a fluorine atom, a chlorine atom or —OCF ₃ ).
Although there is no restriction | limiting in the kind of compound which can be combined, It combines suitably for every embodiment in consideration of solubility at low temperature, transition temperature, electrical reliability, birefringence, etc. For example, in one embodiment of the present invention, there is one. Furthermore, in another embodiment of this invention, they are two types. Or in another embodiment of this invention, they are three types. In still another embodiment of the present invention, there are four types. Or in another embodiment of this invention, they are five or more types.

  The content of the compound represented by the general formula (XIV-2) is an upper limit and a lower limit for each embodiment in consideration of properties such as solubility at low temperatures, transition temperature, electrical reliability, and birefringence. There is a value. For example, in one embodiment of the present invention, the lower limit of the content is 0.1% with respect to the total amount of the liquid crystal composition of the present invention, 0.5% in another embodiment, and in another embodiment. 1%, yet another embodiment is 1.2%, yet another embodiment is 1.5%, yet another embodiment is 2%, and yet another embodiment is 2.5%. . In still another embodiment, it is 3%.

  The upper limit of the content is, for example, 25% in one embodiment of the present invention, 20% in another embodiment, 15% in yet another embodiment, 10% in yet another embodiment, In yet another embodiment it is 8% and in yet another embodiment 7%.

  When the liquid crystal composition of the present invention is used for a liquid crystal display device having a low driving voltage, it is suitable to increase the content of the compound represented by the general formula (XIV-2). In the case of a liquid crystal 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 (XIV-2).

  Furthermore, it is preferable that the compound represented by general formula (XIV-2) which concerns on this invention is a compound represented by general formula (XIV-2-1).

(In the general formula (XIV-2-1), R ¹⁴ 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.)
The content of the compound represented by the general formula (XIV-2-1) is preferably 1% by mass or more, more preferably 3% by mass or more, more preferably 5% by mass with respect to the total amount of the liquid crystal composition of the present invention. % Or more is more preferable, and 7 mass% or more is particularly preferable. In consideration of solubility at low temperatures, transition temperature, electrical reliability, etc., the maximum ratio is preferably 15% by mass or less, more preferably 13% by mass or less, and even more preferably 11% by mass or less. , Less than 9% by mass is particularly preferable.

  Furthermore, the compound represented by the general formula (XIV-2-1) is specifically preferably a compound represented by the formula (53.1) to the formula (53.4), among which the formula (53. It is preferable to contain the compound represented by 4).

  Furthermore, the compound represented by General Formula (XIV-2) is preferably a compound represented by General Formula (XIV-2-2).

(In the general formula (XIV-2-2), R ¹⁴ 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.)
The content of the compound represented by the general formula (XIV-2-2) is preferably 3% by mass or more, more preferably 6% by mass or more, and 9% by mass with respect to the total amount of the liquid crystal composition of the present invention. % Or more is more preferable, and 12% by mass or more is particularly preferable. In consideration of solubility at low temperature, transition temperature, electrical reliability, etc., the maximum ratio is preferably 20% by mass or less, more preferably 17% by mass or less, and even more preferably 15% by mass or less. 14 mass% or less is particularly preferable.

  Further, the compound represented by the general formula (XIV-2-2) is specifically preferably a compound represented by the formula (54.1) to the formula (54.4), among which the formula (54. It is preferable to contain the compound represented by 2) and / or Formula (54.4).

  Furthermore, it is preferable that the compound represented by general formula (XIV-2) is a compound represented by general formula (XIV-2-3).

(In the general formula (XIV-2-3), R ¹⁴ 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.)
The content of the compound represented by the general formula (XIV-2-3) is preferably 5% by mass or more, more preferably 9% by mass or more, and more preferably 12% by mass with respect to the total amount of the liquid crystal composition of the present invention. % Or more is particularly preferable. In consideration of solubility at low temperatures, transition temperature, electrical reliability, etc., the maximum ratio is preferably limited to 30% by mass or less, more preferably less than 27% by mass, and even more preferably 24% by mass or less. , Less than 20% by mass is particularly preferable.

  Further, the compound represented by the general formula (XIV-2-3) is specifically preferably a compound represented by the formula (55.1) to the formula (55.4), among which the formula (55. It is preferable to contain the compound represented by 2) and / or Formula (55.4).

  Furthermore, the compound represented by General Formula (XIV-2) is preferably a compound represented by General Formula (XIV-2-4).

(In the general formula (XIV-2-4), R ¹⁴ 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.)
Although there is no restriction | limiting in the kind of compound which can be combined, It combines suitably for every embodiment in consideration of solubility at low temperature, transition temperature, electrical reliability, birefringence, etc. For example, in one embodiment of the present invention, there is one. Furthermore, in another embodiment of this invention, they are two types. Or in another embodiment of this invention, they are three or more types.

  The content of the compound represented by the general formula (XIV-2-4) is an upper limit for each embodiment in consideration of properties such as solubility at low temperatures, transition temperature, electrical reliability, and birefringence. There is a lower limit. For example, in one embodiment of the present invention, the lower limit of the content is 0.1% with respect to the total amount of the liquid crystal composition of the present invention, 0.5% in another embodiment, and in another embodiment. 0.7%, yet another embodiment is 1%, yet another embodiment is 1.2%, yet another embodiment is 1.8%, and yet another embodiment is 2%. . In still another embodiment, it is 2.5%. In still another embodiment, it is 3%.

  The upper limit of the content is, for example, 15% in one embodiment of the present invention, 12% in another embodiment, 11% in still another embodiment, 10% in yet another embodiment, In yet another embodiment it is 8%, and in yet another embodiment 6%.

  The upper limit of the content is, for example, 35% in one embodiment of the present invention, 30% in another embodiment, 25% in still another embodiment, and 20% in yet another embodiment. In yet another embodiment it is 15% and in yet another embodiment 10%.

  When the liquid crystal composition of the present invention is used for a liquid crystal display element having a low driving voltage, it is suitable to increase the content of the compound represented by the general formula (XIV-2-4). In the case of a liquid crystal composition 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 (XIV-2-4).

  Furthermore, the compound represented by the general formula (XIV-2-4) is specifically preferably a compound represented by the formula (56.1) to the formula (56.4), among which the formula (56. It is preferable to contain the compound represented by 1), Formula (56.2), and Formula (56.4). The content of the compound represented by the formula (56.2) is preferably 3% by mass or more and 15% by mass or less based on the total mass of the liquid crystal composition of the present invention.

  Furthermore, it is preferable that the compound represented by general formula (XIV-2) is a compound represented by general formula (XIV-2-5).

(In the general formula (XIV-2-5), R ¹⁴ 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.)
The content of the compound represented by the general formula (XIV-2-5) is preferably 5% by mass or more, more preferably 10% by mass or more, and 13% by mass with respect to the total amount of the liquid crystal composition of the present invention. % Or more is particularly preferable. In consideration of solubility at low temperatures, transition temperature, electrical reliability, etc., the maximum ratio is preferably limited to 25% by mass or less, more preferably less than 22% by mass, and even more preferably 18% by mass or less. , Less than 15% by mass is particularly preferable.

  Furthermore, the compound represented by the general formula (XIV-2-5) is specifically a compound represented by the formula (57.1) to the formula (57.4). Among these, it is preferable to contain compounds represented by formulas (57.1) and (57.2). The content of the compound represented by the formula (57.2) is preferably 3% by mass or more and 20% by mass or less with respect to the total mass of the liquid crystal composition of the present invention.

  Furthermore, the compound represented by General Formula (XIV-2) is preferably a compound represented by General Formula (XIV-2-6).

(In the formula, R ¹⁴ 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.)
The content of the compound represented by the general formula (XIV-2-6) is preferably 5% by mass or more, more preferably 10% by mass or more, and 15% by mass with respect to the total amount of the liquid crystal composition of the present invention. % Or more is particularly preferable. In consideration of solubility at low temperature, transition temperature, electrical reliability, etc., the maximum ratio is preferably limited to 25% by mass or less, more preferably 22% by mass or less, and even more preferably 20% by mass or less. , Less than 17% by mass is particularly preferable.

  Furthermore, the compound represented by the general formula (XIV-2-6) is specifically preferably a compound represented by the formula (58.1) to the formula (58.4), among which the formula (58. It is preferable to contain the compound represented by 2).

    The liquid crystal composition according to the present invention has a general formula (K):

(In the general formula (K), each R ^k1 independently represents an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms, and one or non-adjacent 2 in the group) _Two or more —CH ₂ — may be independently substituted by —C≡C—, —O—, —CO—, —COO— or —OCO—, and one or two in the group The above hydrogen atoms may be independently substituted with fluorine atoms,
Ring K ¹ and Ring K ² are each independently a 1,4-cyclohexylene group (one or two or more non-adjacent —CH ₂ — in the group is substituted by —O— or —S—). Or a 1,4-phenylene group (one or two or more non-adjacent —CH═ in the group may be substituted by —N═), and hydrogen in the group Each atom may be independently substituted with a cyano group, a fluorine atom or a chlorine atom,
K ⁰ represents a naphthalene-2,6-diyl group or a 1,4-phenylene group, and each hydrogen atom in the group may be independently substituted with a fluorine atom,
Z ^k1 , Z ^k2 and Z ^k3 are each independently a single bond, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —OCH ₂ —, —CH ₂ O—, —OCF ₂ —, — CF ₂ O—, —CH ₂ CH ₂ CF ₂ O—, —COO—, —OCO— or —C≡C—
n ^k1 and n ^k2 each independently represent 0, 1, 2, 3 or 4, but when n ^k1 and n ^{k2 are} 2 or more, ring K ² and ring K ² may be the same or different. Z ^k1 and Z ^k3 may be the same or different,
X ^k1 and X ^k2 each independently represent a hydrogen atom, a chlorine atom or a fluorine atom,
Y ^k1 independently represents a chlorine atom, a fluorine atom, a cyano group, a trifluoromethyl group, a fluoromethoxy group, a difluoromethoxy group, a trifluoromethoxy group, or a 2,2,2-trifluoroethyl group, A fluorine atom, a trifluoromethyl group, a fluoromethoxy group, a difluoromethoxy group or a trifluoromethoxy group is represented. It is preferable that the compound chosen from the compound group represented by this is included.

  The compound represented by the general formula (K) according to the present invention is preferably at least one selected from the group consisting of compounds represented by the following general formula (K1) to general formula (K3).

(In the general formula (K1), R ^k1 , ring K ¹ , ring K ² , n ^k1 , X ^k1 , X ^k2 , Y ^k1 , Z ^k1 , Z ^k2 and Z ^k3 are the same as those in the general formula (K). And X ^k3 and X ^k4 each independently represents a hydrogen atom, a chlorine atom or a fluorine atom.)

(In the general formula (K2), R ^k1 , ring K ¹ , ring K ² , n ^k1 , X ^k1 , X ^k2 , X ^k3 , X ^k4 , Y ^k1 , Z ^k1 , Z ^k2, and Z ^k3 are the same as those described above. (It is omitted here because it is as in general formula (K1))

(In the above general formula (K3), R ^k1 , X ^k1 , X ^k2 , X ^k3 , X ^k4 , Y ^k1 , and Z ^k1 are the same as those in the general formula (K) described above, and are omitted here.)
In the liquid crystal composition according to the present invention, the content of the compound represented by the general formula (K1) is preferably 1% by mass or more, preferably 3% by mass or more, and 5% by mass or more. Is more preferably 10% by mass or more. More specifically, it is preferably 3% by mass to 70% by mass, more preferably 5% by mass to 60% by mass, further preferably 10% by mass to 60% by mass, and further preferably 10% by mass. To 50% by mass is more preferable.

  In the liquid crystal composition according to the present invention, the content of the compound represented by the general formula (K2) is preferably 1% by mass or more, preferably 3% by mass or more, and 5% by mass or more. Is more preferably 10% by mass or more. More specifically, it is preferably 3% by mass to 70% by mass, more preferably 5% by mass to 60% by mass, further preferably 10% by mass to 60% by mass, and further preferably 10% by mass. To 50% by mass is more preferable.

  In the liquid crystal composition according to the present invention, the content of the compound represented by the general formula (K3) is preferably 1% by mass or more, preferably 2% by mass or more, and 3% by mass or more. Is more preferable, and it is still more preferable that it is 4 mass% or more. More specifically, it is preferably 1% by mass to 30% by mass, more preferably 1.5% by mass to 20% by mass, and further preferably 1.8% by mass to 15% by mass. More preferably, the content is 2.2% by mass to 12% by mass.

  In the liquid crystal composition according to the invention, at least one selected from the group consisting of a compound represented by the general formula (K1), a compound that can be fished from the general formula (K2), and a compound represented by the general formula (K3). Preferably it contains seeds.

  In the liquid crystal composition according to the present invention, it is preferable to include one or more compounds represented by formula (K1), and it is more preferable to include two to five compounds.

  In the liquid crystal composition according to the present invention, it is preferable to include one or more compounds represented by the general formula (K2), and it is more preferable to include two to five compounds.

  In the liquid crystal composition according to the present invention, it is preferable to include one or more compounds represented by formula (K3), and it is more preferable to include 2 to 5 compounds.

  In the liquid crystal composition according to the present invention, the compounds represented by the general formula (K1), the general formula (K2), and the general formula (K3) are preferably contained in a total of one kind or two or more kinds. It is preferable to contain species, more preferably 1 to 8 species, still more preferably 2 to 8 species, and particularly preferably 2 to 5 species.

  The compound represented by the general formula (K) according to the present invention is preferably a compound selected from the group of compounds represented by the following general formulas (K11) to (K28), from the general formula (K11) to ( More preferred are compounds selected from the group of compounds represented by K17) and general formulas (K25) to (K28), and compounds selected from the group of compounds represented by general formulas (K11) to (K17). It is particularly preferred.

(In the above general formulas (K11) to (K24), R ^k1 , ring K ² , Z ^k2 , Z ^k3 , n ^k1 , X ^k1 , X ^k2 , X ^k3 , X ^k4 and Y ^k1 are as described above. .)

In the general formulas (K11) to (K28), R ^k1 , X ^k1 , X ^k2 , Z ^k2 , Ring K ² , Z ^k3 , n ^k1 , X ^k3 , X ^k4 and Y ^k1 are as described above. , X ^k1 and X ^k2 are particularly preferably a fluorine atom, Z ^k2 and Z ^k3 are particularly preferably a single bond, and ring K ² is a 1,4-phenylene group, 3-fluoro-1,4- A phenylene group or a 3,5-difluoro-1,4-phenylene group is preferable, a 3,5-difluoro-1,4-phenylene group is particularly preferable, and n ^k1 is 0 or 1. preferably, particularly preferably from 1, particularly preferably X ^k3 and X ^k4 is a fluorine atom, it is preferred that Y ^k1 is a fluorine atom or a trifluoromethoxy group, it is fluorine atom Preferred.

  In the liquid crystal composition according to the present invention, the content of the compounds represented by the general formulas (K11) to (K17) is preferably 1% by mass or more, preferably 3% by mass or more, and 5% by mass. More preferably, it is more preferably 10% by mass or more. More specifically, it is preferably 3% by mass to 70% by mass, more preferably 5% by mass to 60% by mass, further preferably 10% by mass to 60% by mass, and further preferably 10% by mass. To 50% by mass is more preferable.

  In the liquid crystal composition according to the present invention, the content of the compounds represented by the general formulas (K25) to (K28) is preferably 1% by mass or more, preferably 3% by mass or more, and 5% by mass. More preferably, it is more preferably 10% by mass or more. More specifically, it is preferably 3% by mass to 70% by mass, more preferably 5% by mass to 60% by mass, further preferably 10% by mass to 60% by mass, and further preferably 10% by mass. To 50% by mass is more preferable.

  In the liquid crystal composition according to the present invention, the compounds represented by the general formulas (K11) to (K17) are preferably contained in one kind or two or more kinds, and preferably 1 to 10 kinds are contained. -8 types are more preferably contained, 2-8 types are more preferably contained, and 2-5 types are particularly preferably contained.

  In the liquid crystal composition according to the present invention, the compounds represented by the general formulas (K25) to (K28) are preferably contained in one kind or two or more kinds, and preferably 1 to 10 kinds are contained. -8 types are more preferably contained, 2-8 types are more preferably contained, and 2-5 types are particularly preferably contained.

  The liquid crystal composition according to the present invention may contain a compound represented by the general formula (PN) as a liquid crystal compound having a positive dielectric anisotropy having an absolute value of 4 or more.

In the above general formula (PN), R ⁿ¹ represents an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms, and one in the group or two or more non-adjacent —CH _2- is each independently substituted by -C≡C-, -O-, -CO-, -COO- or -OCO-, and is one or more hydrogen atoms in the group Each independently may be substituted with a fluorine atom.

In the above general formula (PN), ring N ¹ is a 1,4-cyclohexylene group (one or two or more non-adjacent —CH ₂ — in the group is substituted by —O— or —S—). Or a 1,4-phenylene group (one or two or more non-adjacent —CH═ may be substituted by —N═) in the group, Each hydrogen atom may be independently substituted with a cyano group or a fluorine atom.

In the above general formula (PN), Z ⁿ¹ and Z ⁿ² are each independently a single bond, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —OCH ₂ —, —CH ₂ O—, —OCF ₂ —, —CF ₂ O—, —CH ₂ CH ₂ CF ₂ O—, —COO—, —OCO— or —C≡C— is represented.

In the above general formula (N1), n ⁿ¹ each independently represents an integer of 0 to 4, and when n ⁿ¹ is 2 or more, the rings N ¹ may be the same or different, and Z ⁿ¹ may be the same or different.

In the above general formula (PN), X ⁿ¹ , X ⁿ² , X ⁿ³ , X ⁿ⁴ and X ⁿ⁵ each independently represent a hydrogen atom or a fluorine atom.

In the above general formula (PN), Y ⁿ¹ represents a fluorine atom, a cyano group, a trifluoromethyl group, a fluoromethoxy group, a difluoromethoxy group, a trifluoromethoxy group, or a 2,2,2-trifluoroethyl group. Represents a fluorine atom, a trifluoromethyl group, a fluoromethoxy group, a difluoromethoxy group or a trifluoromethoxy group.

  The liquid crystal composition according to the present invention further includes a compound represented by the general formula (PN), and is more preferable in that it maintains high refractive index anisotropy (Δn) and is excellent in reliability.

  In the liquid crystal composition according to the present invention, the content of the compound represented by the general formula (PN) is preferably 0 to 60% by mass, more preferably 1 to 50% by mass, and 1 to 40% by mass. % Is more preferable, 5 to 40% by mass is further preferable, and 10 to 40% by mass is particularly preferable.

  In the liquid crystal composition according to the present invention, the compound represented by the general formula (PN) is contained in one kind or two or more kinds, preferably 1 to 10 kinds are contained, and 1 to 8 kinds are contained. Is more preferable, 2 to 8 types are more preferably included, and 2 to 5 types are particularly preferable.

  The compound represented by the general formula (PN) according to the present invention is preferably a compound selected from the group consisting of compounds represented by the general formulas (PN1) and (PN2), and represented by the general formula (PN2). More preferably, it is a compound.

In the general formula (PN1) and general formula (PN2), R ⁿ¹ , ring N ¹ , Z ⁿ¹ , n ⁿ¹ , X ⁿ¹ , X ⁿ² , X ⁿ⁴ , X ⁿ⁵ and Y ⁿ¹ are as described above. Ring N ¹ is 1,4-cyclohexylene group, tetrahydropyran-2,5-diyl group, 1,4-phenylene group, 3-fluoro-1,4-phenylene group or 3,5-difluoro-1,4. -A phenylene group or a dioxane group is preferable, and a 1,4-phenylene group, a 3-fluoro-1,4-phenylene group, or a 3,5-difluoro-1,4-phenylene group is more preferable. ⁿ¹ is particularly preferably a single bond, it is preferred that n ⁿ¹ is 0 or 1, preferably X ⁿ¹ and X ⁿ² is a hydrogen atom or a fluorine atom, this least one is a fluorine atom It is preferable, more preferably, at least one of a fluorine atom, both fluorine atoms but more preferably, particularly preferably both are fluorine atom, X ⁿ⁴ and X ⁿ⁵ is a hydrogen atom or a fluorine atom It is particularly preferable that Y ⁿ¹ is a fluorine atom or a trifluoromethoxy group.

  In the liquid crystal composition according to the present invention, the content of the compound represented by the general formula (N1) is preferably 0 to 60% by mass, more preferably 1 to 50% by mass, and 1 to 40% by mass. % Is more preferable, 5 to 40% by mass is further preferable, and 10 to 40% by mass is particularly preferable.

  In the liquid crystal composition according to the present invention, the content of the compound represented by the general formula (N2) is preferably 0 to 60% by mass, more preferably 1 to 50% by mass, and 1 to 40% by mass. % Is more preferable, 5 to 40% by mass is further preferable, and 10 to 40% by mass is particularly preferable.

  The compound represented by the general formula (PN) according to the present invention is also preferably the following general formula (PN3).

In the general formula (PN3), R ⁿ¹ , ring N ¹ , X ⁿ¹ , X ⁿ² , X ⁿ⁴ , X ⁿ⁵ and Y ⁿ¹ are as described above.

In the general formula (PN3), X ¹ and X ² each independently represent a hydrogen atom or a fluorine atom, but at least one is preferably a fluorine atom, and both are preferably fluorine atoms.

In the above general formula (PN3), ring N ¹ is 1,4-cyclohexylene group, tetrahydropyran-2,5-diyl group, 1,4-phenylene group, 3-fluoro-1,4-phenylene group, 3 , 5-difluoro-1,4-phenylene group or dioxane group is 1,4-phenylene group, 3-fluoro-1,4-phenylene group or 3,5-difluoro-1,4-phenylene group More preferably.

  In the general formula (PN3), n represents an integer of 0 or more and 2 or less, and is preferably 0 or 1.

  In the liquid crystal composition according to the present invention, the content of the compound represented by the general formula (PN3) is preferably 0 to 60% by mass, more preferably 1 to 50% by mass, and 1 to 40% by mass. % Is more preferable, 5 to 40% by mass is further preferable, and 10 to 40% by mass is particularly preferable.

  In the liquid crystal composition according to the present invention, the compound represented by the general formula (PN3) is contained in one or more types, preferably 1 to 10 types, and preferably 1 to 8 types. More preferably, it is more preferably 2 to 8 types, and particularly preferably 2 to 5 types.

  As the compound represented by the general formula (PN3) according to the present invention, the following (PN11) to (PN14) are preferable.

  In the liquid crystal composition according to the present invention, the content of the compounds represented by the general formulas (PN11) to (PN14) is preferably 0 to 60% by mass, more preferably 1 to 50% by mass, It is more preferably 1 to 40% by mass, further preferably 5 to 40% by mass, and particularly preferably 10 to 40% by mass.

Moreover, as a compound represented by general formula (PN), at least 1 sort (s) selected from the group which consists of the following formula | equation (PN15) and formula (PN16) is preferable.

  The liquid crystal composition according to the present invention may further contain a compound represented by the following general formula (L) as an optional component, and the compound represented by the general formula (L) is a nonpolar compound (dielectric anisotropy). Is preferably -1.0 to +1.0).

  The general formula (L) is

(In the above general formula (L), R ^L1 and R ^L2 each independently represent an alkyl group having 1 to 8 carbon atoms, and one or non-adjacent at least two —CH in the alkyl group. Each ₂ -may be independently substituted by -CH = CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-,
OL represents 0, 1, 2 or 3;
B ^L1 , B ^L2 and B ^L3 are each independently
(A) a 1,4-cyclohexylene group (one —CH ₂ — present in this group or at least two non-adjacent —CH ₂ — may be replaced by —O—), and ,
(B) a 1,4-phenylene group (one -CH = present in the group or at least two non-adjacent -CH = may be replaced by -N =),
Each of the groups (a) and (b) may be independently substituted with a cyano group, a fluorine atom or a chlorine atom,
L ^L1 and L ^L2 each independently represent a single bond, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —OCH ₂ —, —CH ₂ O—, —COO—, —OCO—, — OCF ₂ —, —CF ₂ O—, —CH═N—N═CH—, —CH═CH—, —CF═CF— or —C≡C—
When OL is 2 or 3 and a plurality of L ^L2 are present, they may be the same or different, and when OL is 2 or 3 and a plurality of B ^L3 is present, they are the same Or a different compound, but it is preferable to include a compound represented by the above general formula (N).

  The liquid crystal composition according to the present invention may contain one or more compounds represented by the general formula (L). There are no particular restrictions on the types of compounds that can be combined, but they are used in appropriate combinations according to desired properties such as solubility at low temperatures, transition temperatures, electrical reliability, and birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention. Or in another embodiment of the present invention, there are two types. In another embodiment of the present invention, there are three types. Furthermore, in another embodiment of this invention, they are five types. Furthermore, in another embodiment of the present invention, there are six types. Furthermore, in another embodiment of the present invention, there are seven types. Furthermore, in another embodiment of this invention, they are eight types. Furthermore, in another embodiment of the present invention, there are nine types. Furthermore, in another embodiment of this invention, it is ten types. Furthermore, in another embodiment of this invention, they are 12 or more types. Moreover, it is preferable that 1-15 types of compounds represented by general formula (L) are contained, and it is preferable that 3-14 types of compounds represented by general formula (L) are contained. More preferably, the compound represented by formula (L) is more preferably contained in 5 to 12 types.

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

  The content of the compound represented by the general formula (L) with respect to the total mass of the liquid crystal composition of the present invention is, for example, 20 to 98% by mass in one embodiment of the present invention. In still another embodiment of the present invention, the content is 30% to 90% by mass. Furthermore, in another embodiment of this invention, the said content is 40-85 mass%. Furthermore, in another embodiment of this invention, the said content is 45-85 mass%. Furthermore, in another embodiment of this invention, the said content is 50-75 mass%. Furthermore, in another embodiment of this invention, the said content is 55-70 mass%. Furthermore, in another embodiment of this invention, the said content is 56-65 mass%. Furthermore, in another embodiment of this invention, the said content is 25-85 mass%. Furthermore, in another embodiment of this invention, the said content is 30-80 mass%. Furthermore, in another embodiment of this invention, the said content is 47-75 mass%. Furthermore, in another embodiment of this invention, the said content is 53-70 mass%. Furthermore, in another embodiment of this invention, the said content is 60-98 mass%. Furthermore, in another embodiment of this invention, the said content is 62-95 mass%. Furthermore, in another embodiment of this invention, the said content is 58-78 mass%. Furthermore, in another embodiment of this invention, the said content is 65-85 mass%. Furthermore, in another embodiment of this invention, the said content is 70-98 mass%. Furthermore, in another embodiment of this invention, the said content is 47-97.5 mass%.

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

R ^L1 and R ^L2 are a linear alkyl group having 1 to 5 carbon atoms or a linear alkyl group having 1 to 4 carbon atoms when the ring structure to which R ^L1 is bonded is a phenyl group (aromatic). (Or more) alkoxy groups and alkenyl groups having 4 to 5 carbon atoms are preferred, and when the ring structure to which they are bonded is a saturated ring structure such as cyclohexane, pyran and dioxane, a linear carbon atom An alkyl group having 1 to 5 carbon atoms, a linear alkoxy group having 1 to 4 (or more) carbon atoms, and a linear alkenyl group having 2 to 5 carbon atoms are preferable.

  The compound represented by the general formula (L) according to the present invention preferably has no chlorine atom in the molecule when the chemical stability of the liquid crystal composition is required.

  The compound represented by the general formula (L) according to the present invention is preferably, for example, a compound selected from the compound group represented by the general formula (I).

(In the general formula (I), R ¹¹ and R ¹² each independently represents an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an alkenyl group having 2 to 8 carbon atoms. One or more hydrogen atoms in the alkyl group, alkenyl group, alkoxy group or alkenyloxy group may be substituted with a fluorine atom, and the methylene group in the alkyl group, alkenyl group, alkoxy group or alkenyloxy group May be substituted with an oxygen atom as long as the oxygen atoms are not continuously bonded, and may be substituted with a carbonyl group unless the carbonyl group is continuously bonded;
A ¹¹ and A ¹² each independently represents a 1,4-cyclohexylene group, a 1,4-phenylene group, a 2-fluoro-1,4-phenylene group or a 3-fluoro-1,4-phenylene group. )
There are no particular restrictions on the types of compounds that can be combined in the compound group represented by the general formula (I). However, the solubility at low temperatures, viscosity, transition temperature, electrical reliability, birefringence, and the like are required. Depending on the performance to be used, it is combined appropriately. The kind of the compound used is, for example, one kind as one embodiment of the present invention. Or in another embodiment of the present invention, there are two types. In another embodiment of the present invention, there are three types. Furthermore, in another embodiment of this invention, they are four types. Furthermore, in another embodiment of this invention, they are five types. Furthermore, in another embodiment of this invention, they are six or more types.

  The content of the so-called bicyclic compound represented by the general formula (I) in the liquid crystal composition of the present invention is the solubility at low temperature, viscosity, transition temperature, electrical reliability, birefringence, process suitability. In addition, it is necessary to appropriately adjust according to required performance such as dripping marks, image sticking, and dielectric anisotropy.

  The content of the compound represented by the general formula (I) with respect to the total mass of the liquid crystal composition of the present invention is, for example, 10 to 75% by mass in one embodiment of the present invention. Or in another embodiment of this invention, the said content is 10-70 mass%. In still another embodiment of the present invention, the content is 10% to 65% by mass. Furthermore, in another embodiment of this invention, the said content is 10-60 mass%. Furthermore, in another embodiment of this invention, the said content is 15-60 mass%. Furthermore, in another embodiment of this invention, the said content is 15-59 mass%. Furthermore, in another embodiment of this invention, the said content is 15-56 mass%. In still another embodiment of the present invention, the content is 15% to 52% by mass. Furthermore, in another embodiment of this invention, the said content is 15-51 mass%. Furthermore, in another embodiment of this invention, the said content is 15-49 mass%. In still another embodiment of the present invention, the content is 15% to 48% by mass. In still another embodiment of the present invention, the content is 15% to 47% by mass. Furthermore, in another embodiment of this invention, the said content is 15-45 mass%. In still another embodiment of the present invention, the content is 15% to 44% by mass. In still another embodiment of the present invention, the content is 15% to 43% by mass. Furthermore, in another embodiment of this invention, the said content is 15-41 mass%. In still another embodiment of the present invention, the content is 15% to 39% by mass. Furthermore, in another embodiment of this invention, the said content is 15-38 mass%. Furthermore, in another embodiment of this invention, the said content is 15-35 mass%. In still another embodiment of the present invention, the content is 15% to 33% by mass. In still another embodiment of the present invention, the content is 15% to 31% by mass. Furthermore, in another embodiment of this invention, the said content is 15-30 mass%. Furthermore, in another embodiment of this invention, the said content is 15-29 mass%. Furthermore, in another embodiment of this invention, the said content is 15-28 mass%. Furthermore, in another embodiment of this invention, the said content is 15-20 mass%. Furthermore, in another embodiment of this invention, the said content is 17-60 mass%. Furthermore, in another embodiment of this invention, the said content is 20-60 mass%. Furthermore, in another embodiment of this invention, the said content is 27-60 mass%. Furthermore, in another embodiment of this invention, the said content is 28-60 mass%. Furthermore, in another embodiment of this invention, the said content is 30-60 mass%. Furthermore, in another embodiment of this invention, the said content is 31-60 mass%. Furthermore, in another embodiment of this invention, the said content is 32-60 mass%. Furthermore, in another embodiment of this invention, the said content is 33-60 mass%. Furthermore, in another embodiment of this invention, the said content is 34-60 mass%. Furthermore, in another embodiment of this invention, the said content is 35-60 mass%. Furthermore, in another embodiment of this invention, the said content is 36-60 mass%. Furthermore, in another embodiment of this invention, the said content is 37-60 mass%. Furthermore, in another embodiment of this invention, the said content is 39-60 mass%. Furthermore, in another embodiment of this invention, the said content is 41-60 mass%. Furthermore, in another embodiment of this invention, the said content is 42-60 mass%. Furthermore, in another embodiment of this invention, the said content is 43-60 mass%. Furthermore, in another embodiment of this invention, the said content is 44-60 mass%. Furthermore, in another embodiment of this invention, the said content is 46-60 mass%. Furthermore, in another embodiment of this invention, the said content is 47-60 mass%. Furthermore, in another embodiment of this invention, the said content is 48-60 mass%. Furthermore, in another embodiment of this invention, the said content is 49-60 mass%. Furthermore, in another embodiment of this invention, the said content is 51-60 mass%. Furthermore, in another embodiment of this invention, the said content is 17-45 mass%. Furthermore, in another embodiment of this invention, the said content is 27-29 mass%. In still another embodiment of the present invention, the content is 32% to 43% by mass. Furthermore, in another embodiment of this invention, the said content is 34-38 mass%. Furthermore, in another embodiment of this invention, the said content is 36-45 mass%. In still another embodiment of the present invention, the content is 37% to 48% by mass. Furthermore, in another embodiment of this invention, the said content is 42-56 mass%. In still another embodiment of the present invention, the content is 43% to 52% by mass. In still another embodiment of the present invention, the content is 43% to 49% by mass. In still another embodiment of the present invention, the content is 43% to 44% by mass. In still another embodiment of the present invention, the content is 44% to 48% by mass. Furthermore, in another embodiment of this invention, the said content is 47-51 mass%.

  The liquid crystal composition according to the present invention preferably includes the compound group represented by the general formula (I) from the viewpoint of maintaining a low viscosity and providing a liquid crystal composition having a high response speed.

  When the liquid crystal composition of the present invention is kept low and a liquid crystal composition having a high response speed is required, the lower limit value of the content of the compound (group) represented by the general formula (I) is high and the upper limit value is high. High is preferred.

  Furthermore, the compound represented by the general formula (I) is preferably a compound selected from the group of compounds represented by the general formula (I-1).

(In the general formula (I-1), R ¹¹ and R ¹² have the same meaning as in the general formula (I).)
In the liquid crystal composition of the present invention, the compound represented by formula (I-1) is 1 to 10 types, 1 to 9 types, 1 to 8 types, 1 to 7 types, 1 to 6 types, 2 to 9 It is preferable to contain 2-8 types, 2-6 types, 3-9 types, 3-7 types, 3-6 types, or 4-6 types mixed.

  The liquid crystal composition according to the present invention particularly preferably includes a compound group represented by the general formula (I-1) from the viewpoint of maintaining a low viscosity and providing a liquid crystal composition having a high response speed.

  The content of the compound represented by the general formula (I-1) with respect to the total mass of the liquid crystal composition of the present invention is, for example, 2 to 70% by mass in one embodiment of the present invention. Or in another embodiment of this invention, the said content is 3-60 mass%. Moreover, in another embodiment of this invention, the said content is 15-60 mass%. In still another embodiment of the present invention, the content is 15% to 52% by mass. In still another embodiment of the present invention, the content is 15% to 46% by mass. In still another embodiment of the present invention, the content is 15% to 39% by mass. Furthermore, in another embodiment of this invention, the said content is 3-30 mass%. Furthermore, in another embodiment of this invention, the said content is 15-30 mass%. Furthermore, in another embodiment of this invention, the said content is 3-20 mass%. In still another embodiment of the present invention, the content is 17% to 60% by mass. In still another embodiment of the present invention, the content is 20% to 60% by mass. In still another embodiment of the present invention, the content is 26% to 60% by mass. In still another embodiment of the present invention, the content is 2% to 60% by mass. In still another embodiment of the present invention, the content is 30% to 60% by mass. In still another embodiment of the present invention, the content is 33% to 60% by mass. In still another embodiment of the present invention, the content is 38% to 60% by mass. In still another embodiment of the present invention, the content is 42% to 60% by mass. In still another embodiment of the present invention, the content is 47% to 60% by mass. In still another embodiment of the present invention, the content is 17% to 45% by mass. In still another embodiment of the present invention, the content is 27% to 38% by mass. In still another embodiment of the present invention, the content is 23% to 46% by mass. In still another embodiment of the present invention, the content is 36% to 45% by mass. In still another embodiment of the present invention, the content is 37% to 48% by mass. In still another embodiment of the present invention, the content is 38% to 49% by mass. In still another embodiment of the present invention, the content is 42% to 56% by mass. In still another embodiment of the present invention, the content is 42% to 50% by mass. In still another embodiment of the present invention, the content is 43% to 52% by mass.

  When the liquid crystal composition of the present invention has a low viscosity and a liquid crystal composition having a high response speed is required, the above lower limit value is preferably high and the upper limit value is preferably high.

  Furthermore, the compound represented by the general formula (I-1) is preferably a compound selected from the group of compounds represented by the general formula (I-1-1).

(In the general formula (I-1-1), R ¹² represents the same meaning as in the general formula (I), and R ^a1 is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms)
In particular, the liquid crystal composition according to the present invention includes the compound group represented by the general formula (I-1-1) from the viewpoint of maintaining a low viscosity and providing a liquid crystal composition having a high response speed. preferable.

  The content of the compound represented by the general formula (I-1-1) with respect to the total mass of the liquid crystal composition of the present invention is, for example, 1 to 60% by mass in one embodiment of the present invention. . Moreover, as one Embodiment of this invention, it is 1-45 mass%. Or in another embodiment of this invention, the said content is 1-35 mass%. In still another embodiment of the present invention, the content is 1% to 26% by mass. Furthermore, in another embodiment of this invention, the said content is 1-21 mass%. Furthermore, in another embodiment of this invention, the said content is 1-16 mass%. Furthermore, in another embodiment of this invention, the said content is 1-11 mass%. Furthermore, in another embodiment of this invention, the said content is 3-60 mass%. Furthermore, in another embodiment of this invention, the said content is 3-30 mass%. Furthermore, in another embodiment of this invention, the said content is 8-30 mass%. Furthermore, in another embodiment of this invention, the said content is 12-30 mass%. In still another embodiment of the present invention, the content is 3% to 26% by mass. Furthermore, in another embodiment of this invention, the said content is 3-20 mass%. Furthermore, in another embodiment of this invention, the said content is 3-12 mass%. Furthermore, in another embodiment of this invention, the said content is 5-12 mass%. Furthermore, in another embodiment of this invention, the said content is 6-16 mass%. Furthermore, in another embodiment of this invention, the said content is 7-16 mass%. Furthermore, in another embodiment of this invention, the said content is 8-26 mass%. Furthermore, in another embodiment of this invention, the said content is 8-15 mass%. Furthermore, in another embodiment of this invention, the said content is 8-13 mass%. Furthermore, in another embodiment of this invention, the said content is 9-25 mass%. Furthermore, in another embodiment of this invention, the said content is 10-21 mass%. Furthermore, in another embodiment of this invention, the said content is 12-21 mass%. Furthermore, in another embodiment of this invention, the said content is 11-26 mass%.

  Furthermore, the compound represented by the general formula (I-1-1) is preferably a compound selected from the group of compounds represented by formula (1.1) to formula (1.5). 1.2) or a compound represented by formula (1.3) is preferred, and a compound represented by formula (1.3) is particularly preferred.

  When the compound represented by the formula (1.2) or the formula (1.3) is used alone, the response is that the content of the compound represented by the formula (1.2) is high. The content of the compound represented by the formula (1.3) is effective in improving the speed, and the following range is preferable because a liquid crystal composition having a high response speed and high electrical and optical reliability can be obtained.

  The content of the compounds represented by the formulas (1.3) and (1.5) is, for example, 1 to 45 mass as one embodiment of the present invention with respect to the total mass of the liquid crystal composition of the present invention. %. Moreover, as one Embodiment of this invention, it is 1-35 mass%. Or in another embodiment of this invention, the said content is 1-30 mass%. Or in another embodiment of this invention, the said content is 1-25 mass%. Or in another embodiment of this invention, the said content is 1-21 mass%. Or in another embodiment of this invention, the said content is 1-18 mass%. Or in another embodiment of this invention, the said content is 1-13 mass%. Or in another embodiment of this invention, the said content is 1-12 mass%. Or in another embodiment of this invention, the said content is 1-11 mass%. Or in another embodiment of this invention, the said content is 1-10 mass%. Or in another embodiment of this invention, the said content is 3-20 mass%. Or in another embodiment of this invention, the said content is 4-21 mass%. Or in another embodiment of this invention, the said content is 7-21 mass%. Or in another embodiment of this invention, the said content is 10-21 mass%. Or in another embodiment of this invention, the said content is 11-21 mass%. Or in another embodiment of this invention, the said content is 12-21 mass%. Or in another embodiment of this invention, the said content is 13-21 mass%. Or in another embodiment of this invention, the said content is 3-13 mass%. Or in another embodiment of this invention, the said content is 4-7 mass%. Or in another embodiment of this invention, the said content is 5-12 mass%. Or in another embodiment of this invention, the said content is 6-16 mass%. Or in another embodiment of this invention, the said content is 10-16 mass%. Or in another embodiment of this invention, the said content is 7-16 mass%. Or in another embodiment of this invention, the said content is 7-10 mass%. Or in another embodiment of this invention, the said content is 8-18 mass%. Or in another embodiment of this invention, the said content is 8-15 mass%. Or in another embodiment of this invention, the said content is 8-13 mass%. Or in another embodiment of this invention, the said content is 9-13 mass%.

  Furthermore, it is preferable that the compound represented by general formula (I-1) which concerns on this invention is a compound chosen from the compound group represented by general formula (I-1-2).

(In the above general formula (I-1-2), R ¹² represents the same meaning as in general formula (I).)
The kind of compound used as the said general formula (I-1-2) is one kind as one embodiment of this invention, for example. Or in another embodiment of the present invention, there are two types. In another embodiment of the present invention, there are three types.

  In the liquid crystal composition of the present invention, the content of the compound represented by the general formula (I-1-2) includes solubility at low temperature, viscosity, transition temperature, electrical reliability, birefringence, and process compatibility. It is necessary to adjust appropriately according to required properties such as property, dripping marks, image sticking, and dielectric anisotropy.

  The content of the compound represented by the general formula (I-1-2) with respect to the total mass of the liquid crystal composition of the present invention is, for example, 1 to 70% by mass as one embodiment of the present invention. . Moreover, it is 1-65 mass% as one embodiment of this invention. Furthermore, it is 1-55 mass% as one embodiment of this invention. Or in another embodiment of this invention, the said content is 1-50 mass%. In still another embodiment of the present invention, the content is 1% to 49% by mass. In still another embodiment of the present invention, the content is 1% to 47% by mass. Furthermore, in another embodiment of this invention, the said content is 1-45 mass%. Furthermore, in another embodiment of this invention, the said content is 1-44 mass%. Furthermore, in another embodiment of this invention, the said content is 1-40 mass%. Furthermore, in another embodiment of this invention, the said content is 1-39 mass%. In still another embodiment of the present invention, the content is 1% to 38% by mass. Furthermore, in another embodiment of this invention, the said content is 1-36 mass%. Furthermore, in another embodiment of this invention, the said content is 1-35 mass%. Furthermore, in another embodiment of this invention, the said content is 1-32 mass%. Furthermore, in another embodiment of this invention, the said content is 1-30 mass%. Furthermore, in another embodiment of this invention, the said content is 1-28 mass%. Furthermore, in another embodiment of this invention, the said content is 1-27 mass%. Furthermore, in another embodiment of this invention, the said content is 1-26 mass%. Furthermore, in another embodiment of this invention, the said content is 1-24 mass%. Furthermore, in another embodiment of this invention, the said content is 1-21 mass%. Furthermore, in another embodiment of this invention, the said content is 1-20 mass%. Furthermore, in another embodiment of this invention, the said content is 1-19 mass%. Furthermore, in another embodiment of this invention, the said content is 1-16 mass%. Furthermore, in another embodiment of this invention, the said content is 1-15 mass%. Furthermore, in another embodiment of this invention, the said content is 3-60 mass%. Furthermore, in another embodiment of this invention, the said content is 3-30 mass%. In still another embodiment of the present invention, the content is 13% to 49% by mass. Furthermore, in another embodiment of this invention, the said content is 15-49 mass%. Furthermore, in another embodiment of this invention, the said content is 16-49 mass%. In still another embodiment of the present invention, the content is 17% to 49% by mass. Furthermore, in another embodiment of this invention, the said content is 20-49 mass%. In still another embodiment of the present invention, the content is 23% to 49% by mass. Furthermore, in another embodiment of this invention, the said content is 24-49 mass%. In still another embodiment of the present invention, the content is 25% to 49% by mass. Furthermore, in another embodiment of this invention, the said content is 28-49 mass%. In still another embodiment of the present invention, the content is 30% to 49% by mass. Furthermore, in another embodiment of this invention, the said content is 33-49 mass%. Furthermore, in another embodiment of this invention, the said content is 35-49 mass%. In still another embodiment of the present invention, the content is 38% to 49% by mass. Furthermore, in another embodiment of this invention, the said content is 39-49 mass%. In still another embodiment of the present invention, the content is 45% to 49% by mass. In still another embodiment of the present invention, the content is 11% to 44% by mass. Furthermore, in another embodiment of this invention, the said content is 12-24 mass%. Furthermore, in another embodiment of this invention, the said content is 13-16 mass%. In still another embodiment of the present invention, the content is 15% to 32% by mass. Furthermore, in another embodiment of this invention, the said content is 15-21 mass%. Furthermore, in another embodiment of this invention, the said content is 16-27 mass%. In still another embodiment of the present invention, the content is 17% to 28% by mass. Furthermore, in another embodiment of this invention, the said content is 20-35 mass%. Furthermore, in another embodiment of this invention, the said content is 24-40 mass%. Furthermore, in another embodiment of this invention, the said content is 28-38 mass%. Furthermore, in another embodiment of this invention, the said content is 25-36 mass%. Furthermore, in another embodiment of this invention, the said content is 30-40 mass%. Furthermore, in another embodiment of this invention, the said content is 30-39 mass%. Furthermore, in another embodiment of this invention, the said content is 35-44 mass%. Furthermore, in another embodiment of this invention, the said content is 35-40 mass%. Furthermore, in another embodiment of this invention, the said content is 33-47 mass%. Furthermore, in another embodiment of this invention, the said content is 39-47 mass%. Furthermore, in another embodiment of this invention, the said content is 38-45 mass%.

  Furthermore, the compound represented by the general formula (I-1-2) is preferably a compound selected from the group of compounds represented by the formula (2.1) to the formula (2.8). .2) to the compound represented by formula (2.4). In particular, the compound represented by the formula (2.2) is preferable because the response speed of the liquid crystal composition of the present invention is particularly improved. Moreover, when calculating | requiring Tni higher than a response speed, it is preferable to use the compound represented by Formula (2.3) or Formula (2.4). The content of the compounds represented by formula (2.3) and formula (2.4) is preferably less than 30% in order to improve solubility at low temperatures.

  In the liquid crystal composition of the present invention, the content of the compound represented by the formula (2.2) is preferably 1% by mass or more and 70% by mass or less with respect to the total mass of the liquid crystal composition of the present invention. It is preferably 1% by mass or more and 65% by mass or less, preferably 1% by mass or more and 60% by mass or less, more preferably 1% by mass or more and 55% by mass or less, and preferably 1% by mass or more and 50% by mass or less. Or less, preferably 3% by mass or more and 60% by mass or less, and more preferably 5% by mass or more and 50% by mass or less. Among these, 9% by mass to 47% by mass, 9% by mass to 15% by mass, 11% by mass to 44% by mass, 15% by mass to 32% by mass, 20% by mass to 35% by mass, 23 % By mass to 26% by mass, 24% by mass to 40% by mass, 25% by mass to 36% by mass, 28% by mass to 38% by mass, 30% by mass to 40% by mass, 30% by mass to 39% by mass % Or less, 33% to 47% by weight, 35% to 44% by weight, 35% to 40% by weight, 38% to 45% by weight, 39% to 47% by weight are preferable. .

  In the liquid crystal composition of the present invention, the content of the compound represented by the formula (2.3) is preferably 1% by mass or more and 30% by mass or less based on the total mass of the liquid crystal composition of the present invention. It is preferably 1% by mass or less and 25% by mass or less, preferably 3% by mass or more and 25% by mass or less, preferably 4% by mass or more and 22% by mass or less, and more preferably 5% by mass or more and 22% by mass or less. It is preferably 11% by mass or more and 22% by mass or less, preferably 13% by mass or more and 22% by mass or less, preferably 4% by mass or more and 16% by mass or less, and preferably 4% by mass. It is preferably 15% by mass or less, preferably 4% by mass or more and 10% by mass or less, preferably 5% by mass or more and 10% by mass or less, and 12% by mass or more and 15% by mass or less. Preferably, it is preferably not more than 13 wt% or more 16 wt%.

  In the liquid crystal composition of the present invention, the content of the compound represented by the formula (2.4) is preferably 1% by mass or more and 30% by mass or less with respect to the total mass of the liquid crystal composition of the present invention. It is more preferably 1% by mass or less and 25% by mass or less, preferably 3% by mass or more and 30% by mass or less, preferably 4% by mass or more and 25% by mass or less, and more preferably 12% by mass or more and 25% by mass or less. It is preferably 17% by mass or more and 25% by mass or less, more preferably 20% by mass or more and 25% by mass or less, and preferably 4% by mass or more and 20% by mass or less. % To 13% by mass, preferably 12% to 24% by mass, and preferably 17% to 20% by mass.

  The liquid crystal composition of the present invention may further contain a compound represented by the formula (2.5) having a structure similar to that of the compound represented by the general formula (I-1-2).

  It is preferable to adjust the content of the compound represented by the formula (2.5) according to required performance such as solubility at low temperature, transition temperature, electrical reliability, birefringence, etc., and preferable content The range is as shown in the table below.

  It is preferable to adjust the content of the compound represented by the formula (2.5) according to required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. Is preferably contained in an amount of 0 to 40% by mass, preferably 1 to 35% by mass, and preferably 1 to 30% by mass, based on the total mass of the liquid crystal composition of the present invention. It is preferable to contain 10% by mass, preferably 10 to 30% by mass, preferably 15 to 30% by mass, preferably 20 to 30% by mass, and preferably 25 to 30% by mass. preferable.

  Furthermore, it is preferable that the compound represented by general formula (I) based on this invention is a compound chosen from the compound group represented by general formula (I-2).

(In the general formula (I-2), R ¹³ and R ¹⁴ each independently represents an alkyl group having 1 to 5 carbon atoms.)
Although there is no restriction | limiting in particular in the kind of compound which can be combined, It combines according to performance requested | required, such as solubility at low temperature, transition temperature, electrical reliability, birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention. Or in another embodiment of the present invention, there are two types. In another embodiment of the present invention, there are three types.

  In the liquid crystal composition of the present invention, the content of the compound represented by the general formula (I-2) is low temperature solubility, transition temperature, electrical reliability, birefringence index, process suitability, dropping trace. Therefore, it is necessary to adjust appropriately according to required performance such as image sticking and dielectric anisotropy.

  The content of the compound represented by the general formula (I-2) with respect to the total mass of the liquid crystal composition of the present invention is, for example, 1 to 30% by mass in one embodiment of the present invention. Or in another embodiment of this invention, the said content is 2-30 mass%. In still another embodiment of the present invention, the content is 4% to 30% by mass. Furthermore, in another embodiment of this invention, the said content is 4-25 mass%. Furthermore, in another embodiment of this invention, the said content is 3-20 mass%.

  Furthermore, it is preferable that the compound represented by general formula (I-2) is a compound chosen from the compound group represented by Formula (3.1) to Formula (3.4), and Formula (3.1). ), A compound represented by formula (3.3) or formula (3.4). In particular, the compound represented by the formula (3.2) is preferable because the response speed of the liquid crystal composition of the present invention is particularly improved. Moreover, when calculating | requiring Tni higher than a response speed, it is preferable to use the compound represented by Formula (3.3) or Formula (3.4). The content of the compounds represented by formula (3.3) and formula (3.4) is preferably less than 20% in order to improve the solubility at low temperatures.

  Furthermore, it is preferable that the compound represented by general formula (I-2) is a compound chosen from the compound group represented by Formula (3.1) to Formula (3.4), and Formula (3.1). ), A compound represented by formula (3.3) and / or formula (3.4).

  In the liquid crystal composition of the present invention, the content of the compounds represented by the formulas (3.1) and (3.3) is 1% by mass or more and 25% by mass with respect to the total mass of the liquid crystal composition of the present invention. It is preferably 1% by mass or less, preferably 1% by mass or more and 20% by mass or less, more preferably 3% by mass or more and 2% by mass or less, and preferably 1% by mass or more and 15% by mass or less. It is preferably 10% by mass or less, and more preferably 1% by mass to 5% by mass.

  Furthermore, it is preferable that the compound represented by general formula (I) which concerns on this invention is a compound chosen from the compound group represented by general formula (I-3).

(In the general formula (I-3), R ¹³ represents the same meaning as in the general formula (I-2).)
Although there is no restriction | limiting in particular in the kind of compound which can be combined, It combines according to performance requested | required, such as solubility at low temperature, transition temperature, electrical reliability, birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention. Or in another embodiment of the present invention, there are two types. In another embodiment of the present invention, there are three types.

In the liquid crystal composition of the present invention, the content of the compound represented by the general formula (I-3) is the solubility at a low temperature, the transition temperature, the electrical reliability, the birefringence, the process suitability, the dropping trace. Therefore, it is necessary to adjust appropriately according to required performance such as image sticking and dielectric anisotropy.
The preferable range of the content is as shown in the following table.

  The content of the compound represented by the general formula (I-3) with respect to the total mass of the liquid crystal composition of the present invention is, for example, 3 to 30% by mass in one embodiment of the present invention. Or in another embodiment of this invention, the said content is 4-30 mass%. In still another embodiment of the present invention, the content is 15% to 30% by mass. Furthermore, in another embodiment of this invention, the said content is 25-30 mass%. In still another embodiment of the present invention, the content is 3% to 25% by mass. Furthermore, in another embodiment of this invention, the said content is 3-20 mass%. Furthermore, in another embodiment of this invention, the said content is 3-15 mass%. Furthermore, in another embodiment of this invention, the said content is 3-5 mass%.

  When emphasizing solubility at low temperatures, the effect is high when the content is set to be large. On the other hand, when the response speed is important, the effect is high when the content is set low. Furthermore, when improving dripping marks and image sticking characteristics, it is preferable to set the content range in the middle.

  Furthermore, the compound represented by the general formula (I-3) is preferably a compound selected from the group of compounds represented by the formula (4.1) to the formula (4.3). It is preferable that it is a compound represented by this.

  The content of the compound represented by the formula (4.3) is preferably 2% by mass or more and 30% by mass or less, and preferably 4% by mass or more and 30% by mass with respect to the total mass of the liquid crystal composition of the present invention. % Or less, preferably 6% by mass or more and 30% by mass or less, preferably 8% by mass or more and 30% by mass or less, and preferably 10% by mass or more and 30% by mass or less, It is preferably 12% by mass to 30% by mass, preferably 14% by mass to 30% by mass, more preferably 16% by mass to 30% by mass, and 18% by mass to 25% by mass. It is preferable that it is 20 mass% or more and 24 mass% or less, and it is especially preferable that it is 22 mass% or more and 23 mass% or less.

  Furthermore, the compound represented by the general formula (I) according to the present invention is preferably a compound selected from the group of compounds represented by the general formula (I-0).

(In the general formula (I-0), R ^1b represents the same meaning as R ¹ in the general formula (L), R ^2b represents the same meaning as R ² in the general formula (L), and n ^1b represents 1 Or A ^1b represents the same meaning as A ¹ in the general formula (L), and Z ^1b represents the same meaning as Z ¹ in the general formula (L). Preferably one type is selected.

  In the liquid crystal composition of the present invention, the content of the compound represented by the general formula (I-0) is from 1% by mass to 55% by mass with respect to the total mass of the liquid crystal composition of the present invention. It is preferably 1% by mass or more and 50% by mass or less, and preferably 5% by mass or more and 50% by mass or less. Among these, 9% by mass to 47% by mass, 9% by mass to 15% by mass, 11% by mass to 44% by mass, 15% by mass to 32% by mass, 20% by mass to 35% by mass, 23 % By mass to 26% by mass, 24% by mass to 40% by mass, 25% by mass to 36% by mass, 28% by mass to 38% by mass, 30% by mass to 40% by mass, 30% by mass to 39% by mass % Or less, 30% to 38% by mass, 33% to 47% by mass, 35% to 44% by mass, 35% to 40% by mass, 38% to 45% by mass, 39% by mass % To 47% by mass is preferable.

  In the liquid crystal composition of the present invention, the content of the compound represented by the formula (2.3) is preferably 1% by mass or more and 30% by mass or less with respect to the total mass of the liquid crystal composition of the present invention. It is preferably 1% by mass or less and 25% by mass or less, preferably 3% by mass or more and 25% by mass or less, preferably 4% by mass or more and 22% by mass or less, and more preferably 5% by mass or more and 22% by mass or less. It is preferably 11% by mass or more and 22% by mass or less, preferably 13% by mass or more and 22% by mass or less, preferably 4% by mass or more and 16% by mass or less, and preferably 4% by mass. It is preferably 15% by mass or less, preferably 4% by mass or more and 10% by mass or less, preferably 5% by mass or more and 10% by mass or less, and 12% by mass or more and 15% by mass or less. DOO is preferred, it is preferably at most 13 mass% or more 16 wt%.

  In the liquid crystal composition of the present invention, the content of the compound represented by the general formula (I-0) is low temperature solubility, transition temperature, electrical reliability, birefringence, process compatibility, viscosity, It is necessary to adjust appropriately according to required performance such as dripping marks, image sticking, and dielectric anisotropy.

  In particular, a compound represented by the general formula (II-2) described later is preferably contained in the composition from the viewpoint of increasing the response speed of the liquid crystal composition.

  Furthermore, the compound represented by the general formula (I) according to the present invention is preferably a compound selected from the compound group represented by the general formula (I-4).

(In the general formula (I-4), R ¹¹ and R ¹² represent the same meaning as in the general formula (L).)
Although there is no restriction | limiting in particular in the kind of compound which can be combined, It combines according to performance requested | required, such as solubility at low temperature, transition temperature, electrical reliability, birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention. Or in another embodiment of the present invention, there are two types.

  In the liquid crystal composition of the present invention, the content of the compound represented by the general formula (I-4) is the solubility at a low temperature, the transition temperature, the electrical reliability, the birefringence, the process suitability, and the dropping trace. Therefore, it is necessary to adjust appropriately according to required performance such as image sticking and dielectric anisotropy.

In particular, the formula (5.4) described later is preferably contained in the composition from the viewpoint of increasing the response speed of the liquid crystal composition. Further, it preferred in view of the even-odd effect and elastic constant _{(K 33).}

  The content of the compound represented by the general formula (I-4) with respect to the total mass of the liquid crystal composition of the present invention is, for example, 2 to 30% by mass in one embodiment of the present invention. Or in another embodiment of this invention, the said content is 5-30 mass%. In still another embodiment of the present invention, the content is 6% to 30% by mass. Furthermore, in another embodiment of this invention, the said content is 8-30 mass%. Furthermore, in another embodiment of this invention, the said content is 10-30 mass%. Furthermore, in another embodiment of this invention, the said content is 12-30 mass%. Furthermore, in another embodiment of this invention, the said content is 15-30 mass%. Furthermore, in another embodiment of this invention, the said content is 20-30 mass%. Furthermore, in another embodiment of this invention, the said content is 25-30 mass%. In still another embodiment of the present invention, the content is 2% to 25% by mass. Furthermore, in another embodiment of this invention, the said content is 2-20 mass%. In still another embodiment of the present invention, the content is 2% to 15% by mass. Furthermore, in another embodiment of this invention, the said content is 2-10 mass%. Furthermore, in another embodiment of this invention, the said content is 3-10 mass%.

  In the liquid crystal composition according to the present invention, the type of the compound that can be combined with the compound represented by the general formula (I-4) is not particularly limited, but the solubility at low temperatures, the transition temperature, and the electrical reliability. Combined according to required performance such as properties and birefringence. The kind of compound to be used is 1-10 types as one embodiment of this invention, for example. Or it is 1-8 types in another embodiment of this invention. Moreover, in another embodiment of this invention, it is 1-5 types. In another embodiment, there are 1-3.

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

  Furthermore, the compound represented by General Formula (I-4) is preferably a compound selected from the group of compounds represented by Formula (5.1) to Formula (5.4), and Formula (5.2) To a compound represented by formula (5.7), more preferably at least one compound selected from the group consisting of formula (5.2) to formula (5.4). .

  One of the substituents at the end of the skeleton represented by the general formula (I-4) preferably contains an alkenyl group having 1 to 8 carbon atoms from the viewpoint of high-speed response of the liquid crystal composition.

  In particular, the content of the compounds represented by the formulas (5.1) to (5.7) is preferably 1% by mass or more and 30% by mass or less with respect to the total mass of the liquid crystal composition of the present invention. . Among these, for example, 3 to 10% by mass, 4 to 30% by mass, 6 to 30% by mass, 8 to 30% by mass, 10 to 30% by mass 12 mass% to 30 mass%, 14 mass% to 30 mass%, 16 mass% to 30 mass%, 18 mass% to 30 mass%, 20 mass% to 30 mass%, 22 mass% or more 30% by mass or less, 23% by mass to 30% by mass, 24% by mass to 30% by mass, 25% by mass to 30% by mass, or 4% by mass to 6% by mass, 4% by mass to 8% by mass 4% to 10% by mass 4% to 12% by mass 4% to 14% by mass 4% to 16% by mass 4% to 18% by mass 4% to 4% by mass 20% by mass or less, 4 The amount% or more and 25 mass% or less, 2 wt% to 25 wt% or less, 20 wt% or more than 2 mass%, 15 mass% 2 mass% or more or less.

  Furthermore, the compound represented by the general formula (I) according to the present invention is preferably a compound selected from the group of compounds represented by the general formula (I-5).

(In the general formula (I-5), R ¹¹ and R ¹² have the same meaning as in general formula (I).)
Although there is no restriction | limiting in particular in the kind of compound which can be combined, It combines according to performance requested | required, such as solubility at low temperature, transition temperature, electrical reliability, birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention. Or in another embodiment of the present invention, there are two types.

In the liquid crystal composition of the present invention, the content of the compound represented by the general formula (I-5) is low temperature solubility, transition temperature, electrical reliability, birefringence index, process suitability, dropping trace. Therefore, it is necessary to adjust appropriately according to required performance such as image sticking and dielectric anisotropy.
The preferable range of the content is as shown in the following table.

  The content of the compound represented by the general formula (I-5) with respect to the total mass of the liquid crystal composition of the present invention is, for example, 1 to 30% by mass in one embodiment of the present invention. Or in another embodiment of this invention, the said content is 1-25 mass%. In still another embodiment of the present invention, the content is 1% to 20% by mass. Furthermore, in another embodiment of this invention, the said content is 1-15 mass%. Furthermore, in another embodiment of this invention, the said content is 1-11 mass%. Furthermore, in another embodiment of this invention, the said content is 1-8 mass%. Furthermore, in another embodiment of this invention, the said content is 1-5 mass%. Furthermore, in another embodiment of this invention, the said content is 3-15 mass%. Furthermore, in another embodiment of this invention, the said content is 3-10 mass%. Furthermore, in another embodiment of this invention, the said content is 5-11 mass%. Furthermore, in another embodiment of this invention, the said content is 8-11 mass%. Furthermore, in another embodiment of this invention, the said content is 10-11 mass%.

  When emphasizing solubility at low temperatures, the effect is high when the content is set to be large. On the other hand, when the response speed is important, the effect is high when the content is set low. Furthermore, when improving dripping marks and image sticking characteristics, it is preferable to set the content range in the middle.

  Furthermore, the compound represented by General Formula (I-5) is preferably a compound selected from the group of compounds represented by Formula (6.1) to Formula (6.6), and is represented by Formula (6.3). It is preferable that it is a compound represented by Formula (6.6).

  Content of the compound represented by said Formula (6.1)-(6.6) is 1-30 mass% as one embodiment of this invention, for example. Or in another embodiment of this invention, the said content is 1-25 mass%. In still another embodiment of the present invention, the content is 1% to 20% by mass. Furthermore, in another embodiment of this invention, the said content is 1-15 mass%. Furthermore, in another embodiment of this invention, the said content is 3-15 mass%. Furthermore, in another embodiment of this invention, the said content is 3-10 mass%. Furthermore, in another embodiment of this invention, the said content is 1-4 mass%. Furthermore, in another embodiment of this invention, the said content is 4-11 mass%. Furthermore, in another embodiment of this invention, the said content is 5-11 mass%. Furthermore, in another embodiment of this invention, the said content is 8-11 mass%.

  The liquid crystal composition of the present invention further contains a compound represented by the formula (6.7) to the formula (6.11) having a structure similar to that of the compound represented by the general formula (I-5). You can also.

  Adjusting the content of the compounds represented by the formulas (6.7) to (6.10) according to required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. Is preferred.

  Content of the compound represented by said Formula (6.7)-(6.10) is 1-15 mass% as one embodiment of this invention, for example. Or in another embodiment of this invention, the said content is 1-14 mass%. In still another embodiment of the present invention, the content is 1% to 12% by mass. Furthermore, in another embodiment of this invention, the said content is 1-11 mass%. Furthermore, in another embodiment of this invention, the said content is 1-10 mass%. Furthermore, in another embodiment of this invention, the said content is 1-9 mass%. Furthermore, in another embodiment of this invention, the said content is 1-5 mass%. Furthermore, in another embodiment of this invention, the said content is 1-4 mass%. Furthermore, in another embodiment of this invention, the said content is 3-11 mass%. Furthermore, in another embodiment of this invention, the said content is 4-11 mass%. Furthermore, in another embodiment of this invention, the said content is 5-11 mass%. Furthermore, in another embodiment of this invention, the said content is 6-11 mass%.

  Furthermore, the compound represented by the general formula (A) according to the present invention is preferably a compound selected from the compound group represented by the general formula (I-6).

(In the general formula (I-6), R ¹¹ and R ¹² have the same meaning as in general formula (I).)
The content of the compound represented by the general formula (I-6) is preferably 2% by mass or more and 30% by mass or less, and preferably 4% by mass or more and 30% by mass with respect to the total mass of the liquid crystal composition of the present invention. % Or less, preferably 5% by mass or more and 30% by mass or less, preferably 6% by mass or more and 30% by mass or less, and preferably 9% by mass or more and 30% by mass or less, It is preferably 12% by mass to 30% by mass, preferably 14% by mass to 30% by mass, more preferably 16% by mass to 30% by mass, and 18% by mass to 25% by mass. It is preferable that it is 20 mass% or more and 24 mass% or less, and it is preferable that it is 22 mass% or more and 23 mass% or less. Furthermore, the compound represented by the general formula (I-6) is preferably a compound represented by the formula (7.1).

  Furthermore, it is preferable that the compound represented by general formula (I) is a compound chosen from the compound group represented by general formula (I-7).

(Wherein R ¹¹ and R ¹² represent the same meaning as in general formula (I).)
The content of the compound represented by the general formula (I-7) with respect to the total mass of the liquid crystal composition of the present invention is preferably 1% by mass to 20% by mass, and preferably 1% by mass to 15% by mass. It is preferable that it is 1 mass% or more and 10 mass% or less, and it is preferable that it is 1 mass% or more and 5 mass% or less.

  Furthermore, the compound represented by the general formula (I-7) is preferably a compound represented by the formula (8.1).

  Furthermore, it is preferable that the compound represented by general formula (I) is a compound chosen from the compound group represented by general formula (I-8).

(In the formula, R ¹⁶ and R ¹⁷ each independently represents an alkenyl group having 2 to 5 carbon atoms.)
Although there is no restriction | limiting in particular in the kind of compound which can be combined, According to performance requested | required, such as solubility at low temperature, transition temperature, electrical reliability, birefringence, it is preferable to combine 1 type to 3 types. . In addition, the content of the compound represented by the general formula (I-8) includes solubility at low temperature, transition temperature, electrical reliability, birefringence, process compatibility, dripping marks, image sticking, dielectric constant. Depending on the required performance such as anisotropy, it is preferably 1 to 30% by mass, preferably 1 to 25% by mass, and 1 to 20% by mass with respect to the total mass of the liquid crystal composition of the present invention. %, Preferably 1 to 18% by weight, preferably 3 to 18% by weight, preferably 4 to 9% by weight, and preferably 4 to 6% by weight. .

  Furthermore, the compound represented by the general formula (I-8) is preferably a compound selected from the group of compounds represented by the formula (9.1) to the formula (9.10), and represented by the formula (9.2). ), A compound represented by formula (9.4) and formula (9.7) is preferable.

  Furthermore, the compound represented by the general formula (L) according to the present invention is preferably a compound selected from, for example, compounds represented by the general formula (II).

(In the general formula (II), R ²¹ and R ²² each independently represents an alkenyl group having 2 to 5 carbon atoms, an alkyl group having 1 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms. It represents, ^{a 2} represents a 1,4-cyclohexylene group or 1,4-phenylene group, ^{Q 2} is a single _{bond, -COO -, - CH 2 -CH} 2 - or an _-CF 2 O-).
Although there is no restriction | limiting in particular in the kind of compound which can be combined, It combines according to performance requested | required, such as solubility at low temperature, transition temperature, electrical reliability, birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention. Or in another embodiment of the present invention, there are two types. Moreover, in another embodiment of this invention, they are three types. Furthermore, in another embodiment of this invention, they are four or more types.

  In the liquid crystal composition of the present invention, the content of the compound represented by the general formula (II) includes solubility at low temperature, transition temperature, electrical reliability, birefringence, process suitability, dripping marks, and burn-in. Therefore, it is necessary to appropriately adjust according to required performance such as dielectric anisotropy.

  The content of the compound represented by the general formula (II) with respect to the total mass of the liquid crystal composition of the present invention is, for example, 3 to 35% by mass as one embodiment of the present invention. Or in another embodiment of this invention, the said content is 3-30 mass%. In still another embodiment of the present invention, the content is 3% to 25% by mass. Furthermore, in another embodiment of this invention, the said content is 3-21 mass%. Furthermore, in another embodiment of this invention, the said content is 3-20 mass%. Furthermore, in another embodiment of this invention, the said content is 3-18 mass%. Furthermore, in another embodiment of this invention, the said content is 3-15 mass%. Furthermore, in another embodiment of this invention, the said content is 3-12 mass%. Furthermore, in another embodiment of this invention, the said content is 4-21 mass%. Furthermore, in another embodiment of this invention, the said content is 11-21 mass%. In still another embodiment of the present invention, the content is 13% to 21% by mass. Furthermore, in another embodiment of this invention, the said content is 15-21 mass%. Furthermore, in another embodiment of this invention, the said content is 16-21 mass%. Furthermore, in another embodiment of this invention, the said content is 4-12 mass%. Furthermore, in another embodiment of this invention, the said content is 11-20 mass%. Furthermore, in another embodiment of this invention, the said content is 13-15 mass%. Furthermore, in another embodiment of this invention, the said content is 15-18 mass%.

  Furthermore, it is preferable that the compound represented by the said general formula (II) is a compound chosen from the compound group represented, for example by general formula (II-1).

(In the general formula (II-1), R ²¹ and R ²² have the same meaning as in general formula (II).)
The content of the compound represented by the general formula (II-1) is preferably adjusted according to required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence.
The preferable range of the content is as shown in the following table.

  The content of the compound represented by the general formula (II-1) is preferably adjusted according to required performance such as solubility at low temperature, transition temperature, electrical reliability, birefringence, 4 mass% or more and 24 mass% or less are preferable, it is preferable that they are 8 mass% or more and 18 mass% or less, and it is still more preferable that they are 12 mass% or more and 14 mass% or less.

  Furthermore, it is preferable that the compound represented by general formula (II-1) is a compound represented, for example by Formula (10.1) and Formula (10.2).

  Furthermore, it is preferable that the compound represented by general formula (II) which concerns on this invention is a compound chosen from the compound group represented, for example by general formula (II-2).

(In the above general formula (II-2), R ²³ represents an alkenyl group having 2 to 5 carbon atoms, and R ²⁴ represents an alkyl group having 1 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms. .)
Although there is no restriction | limiting in particular in the kind of compound which can be combined, It combines according to performance requested | required, such as solubility at low temperature, transition temperature, electrical reliability, birefringence.

  In the liquid crystal composition of the present invention, the preferable content of the compound represented by the general formula (II-2) is, for example, 0.01 to 50% by mass with respect to the total mass of the liquid crystal composition of the present invention. It is done. Among these, for example, 0.05 to 45 mass%, 0.07 to 44 mass%, 0.1 to 42 mass%, 0.2 to 40 mass%, 0.5 to 38 mass%, 0.7 to 35 mass% or 1-33 mass% is preferable. Moreover, in other embodiment, 1.5-28 mass%, 2-29 mass%, or 2.5-45 mass%, 3-40 mass%, 3-15 mass%, 4-35 mass%, 5- 25 mass%, 6-24 mass%, 7-45 mass%, 8-50 mass%, and 9-23 mass% are preferable.

  Furthermore, it is preferable that the compound represented by general formula (II-2) which concerns on this invention is a compound represented, for example by Formula (11.1) to Formula (11.9).

  Although there is no restriction | limiting in particular in the kind of compound which can be combined, It combines according to performance requested | required, such as solubility at low temperature, transition temperature, electrical reliability, birefringence. When the formulas (11.1) and (11.2) are included in the liquid crystal composition, it contributes to the improvement of parameters relating to the high-speed response of the liquid crystal composition. Moreover, the kind of compound to be used is one kind as one embodiment of this invention, for example. Or in another embodiment of the present invention, it is two or more types.

  Contains one of the compounds represented by the formulas (11.1) to (11.9) according to required performance such as solubility at low temperature, transition temperature, electrical reliability, birefringence and the like. Even if two compounds represented by formulas (11.1) to (11.9) are contained, three compounds represented by formulas (11.1) to (11.9) are contained. Furthermore, even if it contains one type of compound represented by the formula (11.1) or one type of compound represented by the formula (11.2), 11. The compound represented by 11.1) and the compound represented by formula (11.2) may be contained, or represented by formula (11.1) to formula (11.3). All compounds may be included. It is more preferable that the compound represented by Formula (11.1) and / or Formula (11.2) is included, and the preferable range of each content is as shown below.

  In the liquid crystal composition of the present invention, the content of each compound represented by formula (11.1) is from 1% by mass to 55% by mass with respect to the total mass of the liquid crystal composition of the present invention. Is preferably 1% by mass or more and 35% by mass or less, and more preferably 1% by mass or more and 25% by mass or less. Among these, 1% by mass to 20% by mass or less, 2% to 19% by mass, 3% to 18% by mass, 3% to 15% by mass, 4% to 15% by mass are preferable. .

  In the liquid crystal composition of the present invention, the content of each compound represented by formula (11.2) is from 1% by mass to 55% by mass with respect to the total mass of the liquid crystal composition of the present invention. Is preferably 1% by mass or more and 35% by mass or less, and more preferably 1% by mass or more and 25% by mass or less. Among these, 1% by mass to 20% by mass or less, 2% to 19% by mass, 3% to 18% by mass, 3% to 15% by mass, 4% to 15% by mass are preferable. .

  In the liquid crystal composition according to the present invention, the case where both the compound represented by the formula (11.1) and the compound represented by the formula (11.2) are contained is preferable from the viewpoint of compatibility. When both the compound represented by the formula (11.1) and the compound represented by the formula (11.2) are contained, the preferred range of the total content of both compounds is the liquid crystal of the present invention. It is preferably 5% by mass to 35% by mass, preferably 6% by mass to 30% by mass, and preferably 7% by mass to 28% by mass with respect to the total mass of the composition. . In these, 8 mass% and 27 mass% or less, 9 mass% or more and 28 mass% or less, 10 mass% or more and 25 mass% or less are preferable.

  In the liquid crystal composition according to the present invention, there is no particular limitation on the types of compounds that contain at least one compound represented by the general formula (II-2), and can be combined. They can be combined according to required performance such as temperature, electrical reliability, and birefringence. The kind of the compound represented by the general formula (II-2) contained in the liquid crystal composition according to the present invention is, for example, one kind as one embodiment of the present invention. Or in another embodiment of the present invention, it is one or two kinds. Moreover, in another embodiment of this invention, it is 1-3 types. Furthermore, in another embodiment of this invention, it is 1-5 types. Furthermore, in another embodiment of this invention, they are 2-5 types. Furthermore, in another embodiment of this invention, it is 2-4 types. Furthermore, in another embodiment of the present invention, there are two to three types.

  The content of the compound represented by the general formula (II-2) according to the present invention includes solubility at low temperature, transition temperature, electrical reliability, birefringence, process compatibility, dripping marks, burn-in, dielectric It is necessary to appropriately adjust according to required performance such as rate anisotropy. For example, the content (total) of the compound represented by the general formula (i) is preferably 1 to 50% by mass with respect to the total mass of the liquid crystal composition of the present invention. More preferable content is 0.01 to 45% by mass, 0.05 to 42% by mass, 0.1 to 38% by mass, 0.7 to 35% by mass, 1 to 33% by mass, and 1.2 to 32%. It is preferable in order of mass%.

  Furthermore, it is preferable that the compound represented by the said general formula (II) is a compound chosen from the compound group represented, for example by general formula (II-3).

(In the general formula (II-3), R ²⁵ represents an alkyl group having 1 to 5 carbon atoms, and R ²⁴ represents an alkyl group having 1 to 5 carbon atoms or an alkoxy group having 1 to 4 carbon atoms. .)
Although there is no restriction | limiting in particular in the kind of compound which can be combined, According to performance requested | required, such as solubility at low temperature, transition temperature, electrical reliability, birefringence, it is 1 type-from among these compounds. It is preferable to contain three types.

  The content of the compound represented by the general formula (II-3) is solubility at low temperature, transition temperature, electrical reliability, birefringence, process compatibility, dripping marks, image sticking, dielectric anisotropy. It is necessary to adjust appropriately according to the required performance.

  The preferable content of the compound represented by the general formula (II-3) is, for example, 2 to 45% by mass with respect to the total mass of the liquid crystal composition of the present invention. Among these, for example, 5-45 mass%, 8-45 mass%, 11-45 mass%, 14-45 mass%, 17-45 mass%, 20-45 mass%, 23-45 mass%, 26- 45 mass%, 29-45 mass%, or 2-45 mass%, 2-40 mass%, 2-35 mass%, 2-30 mass%, 2-25 mass%, 2-20 mass%, 2-15 The mass% is preferably 2 to 10 mass%.

  Furthermore, the compound represented by the general formula (II-3) is preferably a compound represented by the formula (12.1) to the formula (12.3), 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 formula (12.1) is contained, the formula (12.2) Or a compound represented by formula (12.1) and a compound represented by formula (12.2). The compound represented by the formula (12.3) may be an optically active compound.

  The preferable content of the compounds represented by the formulas (12.1) to (12.3) is, for example, 1 to 15% by mass with respect to the total mass of the liquid crystal composition of the present invention. Among these, 1-13 mass%, 1-10 mass%, 2-15 mass%, 2-14 mass%, 2-11 mass%, 3-10 mass% are preferable, for example.

  Furthermore, it is preferable that the compound represented by general formula (II-3) which concerns on this invention is a compound chosen from the compound group represented, for example by general formula (II-3-1).

(In the above general formula (II-3-1), R ²⁵ represents an alkyl group having 1 to 5 carbon atoms, and R ²⁶ represents an alkoxy group having 1 to 4 carbon atoms.)
The content of the compound represented by the general formula (II-3-1) can be adjusted according to required performance such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. It is preferably 1% by mass or more and 24% by mass or less, preferably 4% by mass or more and 18% by mass or less, and more preferably 6% by mass or more and 14% by mass or less.

  Further, the compound represented by the general formula (II-3-1) is preferably, for example, a compound represented by the formula (13.1) to the formula (13.4), in particular, the formula (13.3). It is preferable that it is a compound represented by this.

  Furthermore, it is preferable that the compound represented by general formula (II) which concerns on this invention is a compound chosen from the compound group represented, for example by general formula (II-4).

(In the general formula (II-4), R ²¹ and R ²² are each independently an alkenyl group having 2 to 5 carbon atoms, an alkyl group having 1 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms. Represents.)
Of these compounds, only one kind or two or more kinds may be contained, but it is preferable to combine them appropriately according to the required performance. Although there is no restriction | limiting in particular in the kind of compound which can be combined, Depending on performance requested | required, such as solubility at low temperature, transition temperature, electrical reliability, birefringence, it is 1-2 from these compounds. It is preferable to contain a kind, and it is more preferred to contain 1-3 kinds.

  The content of the compound represented by the general formula (II-4) is preferably 1% by mass to 15% by mass with respect to the total mass of the liquid crystal composition of the present invention, and is preferably 2% by mass to 15% by mass. % Or less, preferably 3% by mass or more and 15% by mass or less, preferably 4% by mass or more and 12% by mass or less, and more preferably 5% by mass or more and 7% by mass or less.

  Further, the compound represented by the general formula (II-4) is preferably, for example, a compound represented by the formula (14.1) to the formula (14.5), and in particular, the formula (14.2) or / And a compound represented by the formula (14.5) is preferable.

  Furthermore, it is preferable that the compound represented by general formula (II) which concerns on this invention is a compound chosen from the compound group represented, for example by general formula (II-5).

(In the general formula (II-5), R ²⁵ represents an alkenyl group having 2 to 5 carbon atoms, an alkyl group having 1 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, Y ²⁶ Represents a hydrogen atom, a fluorine atom, CF ₃ , OCF ₃ , an alkenyl group having 2 to 8 carbon atoms, an alkyl group having 1 to 8 carbon atoms or an alkoxy group having 1 to 8 carbon atoms, X ²¹ and X ²² each independently represents a hydrogen atom or a fluorine atom.)
In the compound represented by general formula (II-5) according to the present ^invention, it is preferable that either one of ^{X 21} and ^{X 22} is a fluorine ^{atom, X 22} is a fluorine atom, and ^{X 21} is a hydrogen atom It is more preferable that

  Of these compounds, only one kind or two or more kinds may be contained, but it is preferable to combine them appropriately according to the required performance. Although there is no restriction | limiting in particular in the kind of compound which can be combined, Depending on performance requested | required, such as solubility at low temperature, transition temperature, electrical reliability, birefringence, it is 1-2 from these compounds. It is preferable to contain a kind, and it is more preferred to contain 1-3 kinds.

  The content of the compound represented by the general formula (II-5) is preferably 1% by mass or more and 30% by mass or less, and preferably 2% by mass or more and 28% by mass with respect to the total mass of the liquid crystal composition of the present invention. % Or less, preferably 3% by mass or more and 27% by mass or less, preferably 4% by mass or more and 26% by mass or less, and more preferably 5% by mass or more and 25% by mass or less.

  Furthermore, the compound represented by the general formula (L) according to the present invention is preferably a compound selected from the compound group represented by the general formula (III).

(In the general formula (III), R ³¹ and R ³² each independently represents an alkenyl group having 2 to 5 carbon atoms, an alkyl group having 1 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms. Represents.)
The content of the compound represented by the general formula (III) is 1% by mass or more and 25% by mass or less based on the total mass of the liquid crystal composition of the present invention in consideration of required solubility and birefringence. It is preferable to contain 2 to 20% by weight, preferably 2 to 15% by weight, preferably 2 to 10% by weight, preferably 4% by weight. % To 6% by mass is preferable.

  Further, the compound represented by the general formula (III) is preferably, for example, a compound represented by the formula (15.1) or the formula (15.2), and particularly represented by the formula (15.1). It is preferable that it is a compound. The content of the compound represented by the formula (15.1) is 3% by mass or more and 10% by mass with respect to the total mass of the liquid crystal composition of the present invention in consideration of required solubility and birefringence. It is preferable to contain below.

  Furthermore, it is preferable that the compound represented by the said general formula (III) is a compound chosen from the compound group represented by general formula (III-1).

(In the above general formula (III-1), R ³³ represents an alkenyl group having 2 to 5 carbon atoms. R ³² each independently represents an alkyl group having 1 to 5 carbon atoms or an alkyl group having 1 to 4 carbon atoms. Represents an alkoxy group.)
The content of the compound represented by the general formula (III-1) is preferably adjusted according to required properties such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. . 4 mass% or more and 23 mass% or less are preferable with respect to the total mass of the liquid-crystal composition of this invention, 6 mass% or more and 18 mass% or less are preferable, and it is 10 mass% or more and 13 mass% or less. preferable.

  The compound represented by the general formula (III-1) is preferably, for example, a compound represented by the formula (16.1) to the formula (16.10). The content of the compound represented by the formula (16.2) to the formula (16.3) is preferably 3% by mass to 10% by mass with respect to the total mass of the liquid crystal composition of the present invention.

  Furthermore, it is preferable that the compound represented by general formula (III) is a compound chosen from the compound group represented by general formula (III-2).

(In the above general formula (III-2), R ³¹ represents the same meaning as in general formula (III).)
The content of the compound represented by the general formula (III-2) is preferably adjusted according to required performance such as solubility at low temperature, transition temperature, electrical reliability, birefringence, 4 mass% or more and 23 mass% or less are preferable with respect to the total mass of the liquid-crystal composition of this invention, 6 mass% or more and 18 mass% or less are preferable, and it is 10 mass% or more and 13 mass% or less. preferable.

  Further, the compound represented by the general formula (III-2) is preferably a compound selected from the group of compounds represented by the formula (17.1) to the formula (17.3). It is preferable that it is a compound represented by 17.3).

  The compound represented by the general formula (L) according to the present invention is preferably selected from the group represented by the general formula (IV).

(In the general formula (IV), R ⁴¹ and R ⁴² each independently represent an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and X ⁴¹ and X ⁴² are each independently Represents a hydrogen atom or a fluorine atom.)
Furthermore, it is preferable that the compound represented by general formula (IV) is a compound chosen from the compound group represented, for example by general formula (IV-1).

(In the general formula (IV), R ⁴³ and R ⁴⁴ each independently represents an alkyl group having 1 to 5 carbon atoms.)
The content of the compound represented by the general formula (IV-1) is solubility at low temperature, transition temperature, electrical reliability, birefringence, process compatibility, dripping marks, image sticking, dielectric anisotropy. It is necessary to adjust appropriately according to the required performance.

  The content of the compound represented by the general formula (IV-1) with respect to the total mass of the liquid crystal composition of the present invention is, for example, 1 to 35% by mass in one embodiment. Furthermore, in another embodiment of this invention, the said content is 1-30 mass%. Furthermore, in another embodiment of this invention, the said content is 1-26 mass%. In still another embodiment of the present invention, the content is 1% to 22% by mass. Furthermore, in another embodiment of this invention, the said content is 1-10 mass%. Furthermore, in another embodiment of this invention, the said content is 1-8 mass%. Furthermore, in another embodiment of this invention, the said content is 1-6 mass%. Furthermore, in another embodiment of this invention, the said content is 2-26 mass%. In still another embodiment of the present invention, the content is 3% to 26% by mass. Furthermore, in another embodiment of this invention, the said content is 11-26 mass%. Furthermore, in another embodiment of this invention, the said content is 20-26 mass%. Furthermore, in another embodiment of this invention, the said content is 2-8 mass%. Furthermore, in another embodiment of this invention, the said content is 2-6 mass%. Furthermore, in another embodiment of this invention, the said content is 11-22 mass%.

  Furthermore, the compound represented by the general formula (IV-1) is preferably a compound represented by, for example, the formula (18.1) to the formula (18.9).

  Although there is no restriction | limiting in particular in the kind of compound which can be combined in the compound represented by the said general formula (IV-1), It is preferable to contain 1 type-3 types from these compounds, and 1 type-4 It is more preferable to contain the types. In addition, since the wide molecular weight distribution of the compound selected from the compound group represented by the general formula (IV-1) is also effective for solubility, for example, in the formula (18.1) or (18.2) 1 type from the compound represented, 1 type from the compound represented by Formula (18.4) or (18.5), 1 type from the compound represented by Formula (18.6) or Formula (18.7) It is preferable to select one compound from the compounds represented by formula (18.8) or (18.9) and combine them as appropriate. Among them, the compounds represented by formula (18.1), formula (18.2), formula (18.3), formula (18.4), formula (18.6) and formula (18.9) are included. It is preferable. The content of the compounds represented by the formulas (18.1) to (18.2) is preferably 3% by mass or more and 8% by mass or less based on the total mass of the liquid crystal composition of the present invention.

  Furthermore, it is preferable that the compound represented by general formula (IV) is a compound chosen from the compound group represented, for example by general formula (IV-2).

(In the general formula (IV), R ⁴³ and R ⁴⁴ each independently represents an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, or an alkenyl group having 2 to 8 carbon atoms. .)
Furthermore, the compound represented by the general formula (IV-2) is preferably, for example, a compound represented by the formula (18.10) to the formula (18.29), among which the formula (18.10) , (18.11), (18.14), (18.15), (18.20), and (18.21) are preferred. The content of the compound represented by the formula (18.10) to the formula (18.29) is preferably 3% by mass or more and 10% by mass or less based on the total mass of the liquid crystal composition of the present invention.

  The kind of the compound represented by the general formula (IV-2) contained in the liquid crystal composition according to the present invention is, for example, one kind as one embodiment of the present invention. Or in another embodiment of the present invention, it is one or two kinds. Moreover, in another embodiment of this invention, it is 1-3 types. Furthermore, in another embodiment of this invention, it is 1-5 types. Furthermore, in another embodiment of this invention, they are 2-5 types. Furthermore, in another embodiment of this invention, it is 2-4 types. Furthermore, in another embodiment of the present invention, there are two to three types.

  Since the wide molecular weight distribution of the compound selected as the component of the liquid crystal composition is also effective for the solubility, for example, one type of the compound represented by the formula (18.10) or (18.11), the formula (18 .14) or (18.15), and selecting one kind from the compounds represented by formula (18.20) or formula (i.12), respectively, and combining these appropriately preferable.

  The compound represented by the general formula (IV-2) according to the present invention preferably has a dielectric anisotropy at 25 ° C. of more than −2.0 and not more than +2.0, and anisotropy of dielectric constant at 25 ° C. More preferably, the property is more than −1.5 and not more than +1.5, and the dielectric anisotropy at 25 ° C. is more preferably more than −1.0 and not more than +1.0.

  Furthermore, the compound represented by the general formula (L) according to the present invention is preferably a compound selected from the group represented by the general formula (V).

(In the general formula (V), R ⁵¹ and R ⁵² each independently 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. A ⁵¹ and A ⁵² each independently represents a 1,4-cyclohexylene group or a 1,4-phenylene group, Q ⁵ represents a single bond or —COO—, and X ⁵¹ and X ⁵² each independently represent Represents a fluorine atom or a hydrogen atom.)
There are no particular limitations on the types of compounds that can be combined, but they are appropriately combined according to required performance such as solubility at low temperatures, transition temperature, electrical reliability, and birefringence. The kind of compound to be used is, for example, one kind in one embodiment of the present invention. Or in another embodiment of the present invention, there are two types. Furthermore, in another embodiment of the present invention, there are three types. Furthermore, in another embodiment of this invention, they are four types.

  The content of the compound represented by the general formula (V) with respect to the total mass of the liquid crystal composition according to the present invention is, for example, 1 to 25% by mass in one embodiment. Furthermore, in another embodiment of this invention, the said content is 1-20 mass%. Furthermore, in another embodiment of this invention, the said content is 1-19 mass%. Furthermore, in another embodiment of this invention, the said content is 1-10 mass%. Furthermore, in another embodiment of this invention, the said content is 1-9 mass%. Furthermore, in another embodiment of this invention, the said content is 1-8 mass%. Furthermore, in another embodiment of this invention, the said content is 1-7 mass%. In still another embodiment of the present invention, the content is 1% to 5% by mass. Furthermore, in another embodiment of this invention, the said content is 1-3 mass%. Furthermore, in another embodiment of this invention, the said content is 1-2 mass%. Furthermore, in another embodiment of this invention, the said content is 2-19 mass%. In still another embodiment of the present invention, the content is 5% to 19% by mass. Furthermore, in another embodiment of this invention, the said content is 9-19 mass%. Furthermore, in another embodiment of this invention, the said content is 2-8 mass%. Furthermore, in another embodiment of this invention, the said content is 6-8 mass%.

  Furthermore, the compound represented by the general formula (V) according to the present invention is preferably a compound represented by the general formula (V-1).

(In the general formula (V-1), R ⁵¹ and R ⁵² , X ⁵¹ and X ⁵² represent the same meaning as in the general formula (V)).
Furthermore, the compound represented by the general formula (V-1) is preferably a compound represented by the general formula (V-1-1).

(In the general formula (V-1-1), R ⁵¹ and R ⁵² represent the same meaning as in the general formula (V).)
The compound represented by the general formula (V-1-1) is preferably contained in an amount of 1% by mass to 15% by mass with respect to the total mass of the liquid crystal composition of the present invention, and is preferably 1% by mass to 10% by mass. It is further preferable to contain 2 to 5% by weight, preferably 3 to 10% by weight, preferably 3 to 7% by weight, It is preferable to contain 3 mass% or more and 5 mass% or less, and it is preferable to contain 3 mass% or more and 4 mass% or less.

Further, the compound represented by the general formula (V-1-1) is preferably a compound represented by the formula (20.1) to the formula (20.4). It is preferable that it is a compound represented. The content of the compound represented by the formula (20.2) is preferably 2% by mass or more and 5% by mass or less based on the total mass of the liquid crystal composition of the present invention.

  Furthermore, the compound represented by General Formula (V-1) according to the present invention is preferably a compound represented by General Formula (V-1-2).

(In the general formula (V-1-2), R ⁵¹ and R ⁵² represent the same meaning as in the general formula (V).)
The compound represented by the general formula (V-1-2) is preferably contained in an amount of 1% by mass to 15% by mass with respect to the total mass of the liquid crystal composition of the present invention. The content is preferably 1% by mass or more and 7% by mass or less, and more preferably 1% by mass or more and 5% by mass or less.

  Further, the compound represented by the general formula (V-1-2) is preferably a compound represented by the formula (21.1) to the formula (21.3), in the formula (21.1) It is preferable that it is a compound represented.

  Furthermore, the compound represented by General Formula (V-1) according to the present invention is preferably a compound represented by General Formula (V-1-3).

(In the general formula (V-1-3), R ⁵¹ and R ⁵² represent the same meaning as in the general formula (V).)
The compound represented by the general formula (V-1-3) is preferably contained in an amount of 1% by mass to 15% by mass with respect to the total mass of the liquid crystal composition of the present invention, and is preferably 2% by mass to 15% by mass. The content is preferably 3% by mass or more and 10% by mass or less, and more preferably 4% by mass or more and 8% by mass or less.

  Furthermore, the compound represented by the general formula (V-1-3) is a compound represented by the formula (22.1) to the formula (22.3). It is preferable that it is a compound represented by Formula (22.1). The content of the compound represented by the formula (22.1) is preferably 2% by mass or more and 5% by mass or less based on the total mass of the liquid crystal composition of the present invention.

  Furthermore, the compound represented by the general formula (V) according to the present invention is preferably a compound represented by the general formula (V-2).

(In the general formula (V-2), R ⁵¹ and R ⁵² , X ⁵¹ and X ⁵² represent the same meaning as in the general formula (V).)
There are no particular limitations on the types of compounds that can be combined, but they are appropriately combined depending on required performance such as solubility at low temperatures, transition temperature, electrical reliability, and birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention. Or in another embodiment of the present invention, it is two or more types.

  The content of the compound represented by the general formula (V-2) with respect to the total mass of the liquid crystal composition of the present invention is, for example, 1 to 30% by mass in one embodiment. Furthermore, in another embodiment of this invention, content of the said compound is 2-25 mass%. Furthermore, in another embodiment of this invention, content of the said compound is 5-19 mass%. Furthermore, in another embodiment of this invention, content of the said compound is 6-10 mass%. Furthermore, in another embodiment of this invention, content of the said compound is 10-19 mass%. Furthermore, in another embodiment of this invention, content of the said compound is 4-8 mass%.

  When an embodiment with high Tni is desired for the liquid crystal composition of the present invention, it is preferable to increase the content of the compound represented by formula (V-2), and when an embodiment with low viscosity is desired It is preferable to reduce the amount.

  Furthermore, the compound represented by General Formula (V-2) according to the present invention is preferably a compound represented by General Formula (V-2-1).

(In the general formula (V-2), R ⁵¹ and R ⁵² represent the same meaning as in the general formula (V).)
Further, the compound represented by the general formula (V-2-1) is preferably a compound represented by the formula (23.1) to the formula (23.4), and the formula (23.1) or / And a compound represented by the formula (23.2) is preferable. The content of the compounds represented by the formulas (23.1) and (23.2) is preferably 2% by mass or more and 5% by mass or less with respect to the total mass of the liquid crystal composition of the present invention.

  Furthermore, it is preferable that the compound represented by general formula (V-2) which concerns on this invention is a compound represented by general formula (V-2-2).

(In the general formula (V-2-2), R ⁵¹ and R ⁵² represent the same meaning as in the general formula (V).)
Furthermore, the compound represented by the general formula (V-2-2) is preferably a compound represented by the formula (24.1) to the formula (24.4), and the formula (24.1) or / And a compound represented by the formula (24.2) is preferable.

  Furthermore, the compound represented by the general formula (V) according to the present invention is preferably a compound represented by the general formula (V-3).

(In the general formula (V-3), R ⁵¹ and R ⁵² represent the same meaning as in the general formula (V).)
There are no particular limitations on the types of compounds that can be combined, but they are appropriately combined according to required performance such as solubility at low temperatures, transition temperature, electrical reliability, and birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention. Or in another embodiment of the present invention, there are two types. Furthermore, in another embodiment of this invention, they are three or more types.

  The compound represented by the general formula (V-3) is preferably contained in an amount of 1% by mass to 16% by mass with respect to the total mass of the liquid crystal composition of the present invention, and preferably 1% by mass to 13% by mass. It is preferable to contain 1 mass% or more and 9 mass% or less, and it is preferable to contain 3 mass% or more and 9 mass% or less.

  Furthermore, the compound represented by the general formula (V-3) is preferably a compound represented by the formula (25.1) to the formula (24.3). The content of the compound represented by the formula (25.1) or the formula (25.2) is preferably 2% by mass or more and 5% by mass or less based on the total mass of the liquid crystal composition of the present invention.

  The compound represented by the general formula (V) according to the present invention is preferably a compound represented by the general formula (V-4).

(In said general formula (V-4), ^R51 and ^R52 are respectively independently a C1-C5 alkyl group, a C2-C5 alkenyl group, or C1-C4. Represents an alkoxy group.)
The compound represented by the general formula (V-4) is preferably contained in an amount of 1% by mass to 15% by mass with respect to the total mass of the liquid crystal composition of the present invention, and preferably 2% by mass or more and 15% by mass or less. It is preferable to contain 3 mass% or more and 10 mass% or less, and it is preferable to contain 4 mass% or more and 8 mass% or less.

  Furthermore, the compound represented by the general formula (V-4) is preferably at least one compound selected from the group of compounds represented by formula (25.11) to formula (25.13), It is more preferable that it is a compound represented by Formula (25.13).

  The compound represented by the general formula (L) according to the present invention is preferably a compound represented by the general formula (V′-5).

(In the general formula ^{(V'-5), R 51} and ^{R 52} are each independently an alkyl group having 1 to 5 carbon atoms, C1-4 alkenyl group or a carbon atom of 2 to 5 carbon atoms Represents an alkoxy group of
The compound represented by the general formula (V′-5) is preferably contained in an amount of 1% by mass to 15% by mass with respect to the total mass of the liquid crystal composition of the present invention, and preferably 2% by mass to 15% by mass. It is preferable to contain, it is preferable to contain 2 to 10 mass%, and it is preferable to contain 5 to 10 mass%.

  Furthermore, the compound represented by the general formula (V′-5) is preferably at least one compound selected from the group of compounds represented by formula (25.21) to formula (25.24). More preferably, it is a compound represented by formula (25.21) and / or formula (25.23).

  The liquid crystal composition of the present invention preferably further contains at least one selected from the group consisting of a compound represented by the general formula (VI) and a compound represented by the general formula (VII). In addition, the compound represented by the general formula (L) according to the present invention is preferably a compound represented by the general formula (VI) and / or a compound represented by the general formula (VII).

(In the above general formulas (VI) and (VII), R ⁶¹ R ⁶² , R ⁷¹ and R ⁷² are each independently a linear alkyl group having 1 to 10 carbon atoms and a linear alkoxy group having 1 to 10 carbon atoms. Represents a group or a straight-chain alkenyl group having 2 to 10 carbon atoms.)
As the compound represented by the general formula (VI), specifically, the following compounds can be preferably used.

  As the compound represented by the general formula (VII), specifically, the following compounds can be preferably used.

  In each of the compounds represented by the general formula (VI) or the general formula (VII), there is no particular limitation on the types of compounds that can satisfy the respective structural formulas, but the solubility at low temperatures, the transition temperature, Depending on the required performance, such as electrical reliability and birefringence, it is preferable to blend 1 to 3 types of compounds satisfying the respective formulas, more preferably 1 to 4 types, It is particularly preferable to contain 1 to 5 or more types.

  The content of the compound represented by the general formula (VI) is preferably 0 to 35% by mass, and preferably 0 to 25% by mass with respect to the total mass of the liquid crystal composition of the present invention. 0 to 15% by mass is preferable.

  The content of the compound represented by the general formula (VII) is preferably 0 to 35% by mass, more preferably 0 to 25% by mass, and 0 to 15% by mass with respect to the total mass of the liquid crystal composition of the present invention. % Is preferred.

  The liquid crystal composition of the present invention preferably does not contain a compound having a structure in which oxygen atoms such as a peracid (—CO—OO—) structure are bonded in the molecule.

  When importance is attached to the reliability and long-term stability of the liquid crystal composition, the content of the compound having a carbonyl group is preferably 5% by mass or less with respect to the total mass of the composition, and 3% by mass or less. More preferably, it is more preferable to set it as 1 mass% or less, and it is most preferable not to contain substantially.

  When importance is attached to stability by UV irradiation, the content of the compound substituted with chlorine atoms is preferably 15% by mass or less, more preferably 10% by mass or less, based on the total mass of the composition. Preferably, it is more preferable to set it as 5 mass% or less, and it is most preferable not to contain substantially.

  It is preferable to increase the content of a compound in which all the ring structures in the molecule are 6-membered rings, and the content of the compound in which all the ring structures in the molecule are 6-membered rings is 80 It is preferably at least mass%, more preferably at least 90 mass%, even more preferably at least 95 mass%, and the liquid crystal is composed only of a compound having substantially all 6-membered ring structures in the molecule. Most preferably it constitutes a composition.

  In order to suppress deterioration due to oxidation of the liquid crystal composition, 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 determined based on the total mass of the composition. The content is preferably 10% by mass or less, more preferably 5% by mass or less, and still more preferably substantially not contained.

  When importance is attached to improvement of viscosity and improvement of Tni, the content of a compound having a 2-methylbenzene-1,4-diyl group in the molecule, in which a hydrogen atom may be substituted with a halogen, may be reduced. Preferably, the content of the compound having a 2-methylbenzene-1,4-diyl group in the molecule is preferably 10% by mass or less, and preferably 5% by mass or less based on the total mass of the composition. Is more preferable, and it is still more preferable not to contain substantially.

  The liquid crystal composition according to the present invention includes a compound represented by the general formula (N) and a compound represented by the general formula (L), and the total content thereof is 10.5 to 95% by mass. It is preferably 20 to 92% by mass, preferably 30 to 90% by mass, and preferably 40 to 88% by mass. Moreover, in another embodiment, it is preferable that it is 30-75 mass%, and it is more preferable that it is 35-70 mass%.

  The liquid crystal composition according to the present invention includes a compound represented by the general formula (N), a compound represented by the general formula (L), and a compound represented by the general formula (M). The content is preferably 10 to 100% by mass in some embodiments, preferably 11 to 98% by mass in other embodiments, and 20 to 95% by mass in other embodiments. In another embodiment, it is preferably 30 to 85 mass%, and in another embodiment, it is preferably 40 to 80 mass%.

  The liquid crystal composition according to the present invention includes a compound represented by the general formula (N), a compound represented by the general formula (L), and a compound represented by the general formula (K). In some embodiments, the content is preferably 10 to 100 mass%, in other embodiments, preferably 13.5 to 98 mass%, and in other embodiments, 20 to 95 mass%. In another embodiment, it is preferably 30 to 85 mass%, and in another embodiment, it is preferably 40 to 80 mass%.

  The liquid crystal composition according to the present invention includes a compound represented by the general formula (N), a compound represented by the general formula (L), a compound represented by the general formula (K), and a general formula (M). The total content of these compounds is preferably 14 to 100% by mass, more preferably 25 to 99% by mass, and preferably 35 to 98% by mass. It is preferable that it is 97 mass%, and it is preferable that it is 50-80 mass%.

  The liquid crystal composition according to the present invention includes a compound represented by the general formula (N), a compound represented by the general formula (I-0), and a compound represented by the general formula (IIa). The total content of is preferably 3.5 to 90% by mass, preferably 6 to 80% by mass, preferably 10 to 70% by mass, and 15 to 60% by mass. preferable.

  In the liquid crystal composition according to the invention, the compound represented by the general formula (N), the compound represented by the general formula (I-0), the compound represented by the general formula (IIa), and the general formula ( K) is included, and the total content thereof is preferably 6.5 to 95% by mass, more preferably 10 to 85% by mass, and 15 to 75% by mass. Preferably, it is 20-65 mass%.

  Preferred embodiments of the liquid crystal composition according to the present invention include a compound represented by the general formula (N), a compound represented by the general formula (I-1-1), and a general formula (I-2). Compound represented by general formula (I-4), compound represented by general formula (I-5), compound represented by general formula (II-2), general formula (II-3) A compound represented by general formula (III), a compound represented by general formula (IV), a compound represented by general formula (V-1), and a compound represented by general formula (V-2). And at least one compound formed from the group consisting of the compound represented by formula (V-3) and the compound represented by formula (X-1), represented by formula (X-2) A compound represented by general formula (X-3), a compound represented by general formula (XI), a compound represented by general formula (X-5), Compound represented by general formula (VIII), compound represented by general formula (IX-1), compound represented by general formula (IX-2), compound represented by general formula (XIII), general formula The group consisting of the compound represented by (M-2), the compound represented by General Formula (M-3), the compound represented by General Formula (K) and the compound represented by General Formula (XIV-2) It is preferable that at least 1 sort formed from these is included. Moreover, it is preferable that these compounds occupy 85-100 mass% in a liquid-crystal composition, and 90-100 mass% is more preferable.

The liquid crystal display device according to the present invention is useful for an AM-LCD (active matrix liquid crystal display device) and can be used for a transmissive or reflective liquid crystal display device.
Further, as a driving method (or mode) of the liquid crystal display element according to the present invention, ECB-LCD, VA-LCD, VA-IPS-LCD, FFS (fringe field switching) -LCD, TN (nematic) It is useful for liquid crystal display elements), STN-LCDs (super twisted nematic liquid crystal display elements), OCB-LCDs and IPS-LCDs (in-plane switching liquid crystal display elements), but IPS mode or FFS mode liquid crystal display elements are particularly preferred. .

  The two substrates of the liquid crystal cell used in the liquid crystal display element can be made of a transparent material having flexibility such as glass or plastic, and one of them can be an opaque material such as silicon. A transparent substrate having a transparent electrode layer can be obtained, for example, by sputtering indium tin oxide (ITO) on a transparent substrate such as a glass plate.

  The color filter can be produced by, for example, a pigment dispersion method, a printing method, an electrodeposition method, or a dyeing method. A method for producing a color filter by a pigment dispersion method will be described as an example. A curable coloring composition for a color filter is applied on the transparent substrate, subjected to patterning treatment, and cured by heating or light irradiation. By performing this process for each of the three colors red, green, and blue, a pixel portion for a color filter can be manufactured. In addition, a pixel electrode provided with an active element such as a TFT or a thin film diode may be provided on the substrate.

  The said board | substrate is made to oppose so that a transparent electrode layer may become an inner side. In that case, you may adjust the space | interval of a board | substrate through a spacer. At this time, it is preferable to adjust so that the thickness of the light control layer (liquid crystal layer) obtained may be 1-100 micrometers. More preferably, the thickness is 1.5 to 10 μm. When a polarizing plate is used, it is preferable to adjust the product of the refractive index anisotropy Δn of the liquid crystal and the cell thickness G so that the contrast is maximized. In addition, when there are two polarizing plates, the polarizing axis of each polarizing plate can be adjusted so that the viewing angle and contrast are good. Furthermore, a retardation film for widening the viewing angle can also be used. Examples of the spacer include columnar spacers made of glass particles, plastic particles, alumina particles, a photoresist material, and the like. Thereafter, a sealant such as an epoxy thermosetting composition is screen-printed on the substrates with a liquid crystal inlet provided, the substrates are bonded together, and heated to thermally cure the sealant.

  As a method for sandwiching a liquid crystal composition (containing a polymerizable compound as necessary) between two substrates, a normal vacuum injection method or an ODF method can be used. However, in the vacuum injection method, there is a problem that an injection mark remains instead of a drop mark. In this invention, it can use more suitably for the display element manufactured using ODF method. In the ODF liquid crystal display device manufacturing process, a sealant such as epoxy photothermal curing is drawn on a backplane or frontplane substrate using a dispenser in a closed-loop bank shape, and then removed. A liquid crystal display element can be manufactured by bonding a front plane and a back plane after dropping a predetermined amount of the liquid crystal composition in the air. The liquid crystal composition of the present invention can be preferably used because the liquid crystal composition can be stably dropped in the ODF process.

  As a method for polymerizing a polymerizable compound, an appropriate polymerization rate is desirable in order to obtain good alignment performance of liquid crystals. Therefore, active energy rays such as ultraviolet rays or electron beams are irradiated singly or in combination or sequentially. The method of polymerizing by is preferred. When ultraviolet rays are used, a polarized light source or a non-polarized light source may be used. In addition, when the polymerization is performed in a state where the polymerizable compound-containing liquid crystal composition is sandwiched between two substrates, at least the substrate on the irradiation surface side must be given appropriate transparency to the active energy rays. I must. Moreover, after polymerizing only a specific part using a mask during light irradiation, the orientation state of the unpolymerized part is changed by changing conditions such as an electric field, a magnetic field, or temperature, and further irradiation with active energy rays is performed. Then, it is possible to use a means for polymerization. In particular, when ultraviolet exposure is performed, it is preferable to perform ultraviolet exposure while applying an alternating electric field to the polymerizable compound-containing liquid crystal composition. The alternating electric field to be applied is preferably an alternating current having a frequency of 10 Hz to 10 kHz, more preferably a frequency of 60 Hz to 10 kHz, and the voltage is selected depending on a desired pretilt angle of the liquid crystal display element. That is, the pretilt angle of the liquid crystal display element can be controlled by the applied voltage. In a horizontal electric field type MVA mode liquid crystal display element, the pretilt angle is preferably controlled from 80 degrees to 89.9 degrees from the viewpoint of alignment stability and contrast.

The temperature during irradiation is preferably within a temperature range in which the liquid crystal state of the liquid crystal composition of the present invention is maintained. Polymerization is preferably performed at a temperature close to room temperature, that is, typically at a temperature of 15 to 35 ° C. As a lamp for generating ultraviolet rays, a metal halide lamp, a high-pressure mercury lamp, an ultra-high pressure mercury lamp, or the like can be used. Moreover, as a wavelength of the ultraviolet-rays to irradiate, it is preferable to irradiate the ultraviolet-ray of the wavelength range which is not the absorption wavelength range of a liquid crystal composition, and it is preferable to cut and use an ultraviolet-ray as needed. Intensity of ultraviolet irradiation is ^preferably from ^{0.1mW / cm 2 ~100W / cm 2} , 2mW / cm 2 ~50W / cm 2 is more preferable. The amount of energy of ultraviolet rays to be irradiated can be adjusted as appropriate, but is preferably 10 mJ / cm ² to 500 J / cm ^{2, and} more preferably 100 mJ / cm ² to 200 J / cm ² . When irradiating with ultraviolet rays, the intensity may be changed. The time for irradiating with ultraviolet rays is appropriately selected depending on the intensity of the irradiating ultraviolet rays.

  The liquid crystal display device using the liquid crystal composition of the present invention is useful for achieving both high-speed response and suppression of display failure, and is particularly useful for a liquid crystal display device for active matrix driving, including VA mode, PSVA mode, It can be applied to liquid crystal display elements for PSA mode, IPS (in-plane switching) mode, VA-IPS mode, FFS (fringe field switching) mode or ECB mode.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a liquid crystal display element (an example of a liquid crystal display) according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a cross-sectional view showing a liquid crystal display element including two substrates facing each other, a sealing material provided between the substrates, and liquid crystal sealed in a sealing region surrounded by the sealing material. It is.

  Specifically, the TFT layer 102 and the pixel electrode 103 are provided on the first substrate 100, the backplane on which the passivation film 104 and the first alignment film 105 are provided, and the black matrix on the second substrate 200. 202, a color filter 203, a planarization film (overcoat layer) 201, and a transparent electrode 204 are provided, and a second alignment film 205 is provided thereon, provided between the front plane facing the back plane and the substrate. A sealing material 301 and a liquid crystal layer 303 sealed in a sealing region surrounded by the sealing material, and protrusions (columnar spacers) 302 and 304 are provided on a substrate surface in contact with the sealing material 301. The specific aspect of a liquid crystal display element is shown.

  The first substrate or the second substrate is not particularly limited as long as it is substantially transparent, and glass, ceramics, plastics, or the like can be used. Examples of plastic substrates include cellulose derivatives such as cellulose, triacetyl cellulose, diacetyl cellulose, polycycloolefin derivatives, polyesters such as polyethylene terephthalate and polyethylene naphthalate, polypropylene, and polyethylene. Polyolefin, polycarbonate, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polyamide, polyimide, polyimide amide, polystyrene, polyacrylate, polymethyl methacrylate, polyether sulfone, polyarylate, and glass fiber-epoxy resin Inorganic-organic composite materials such as glass fiber and acrylic resin can be used.

  When a plastic substrate is used, it is preferable to provide a barrier film. The function of the barrier film is to reduce the moisture permeability of the plastic substrate and to improve the reliability of the electrical characteristics of the liquid crystal display element. The barrier film is not particularly limited as long as it has high transparency and low water vapor permeability. Generally, vapor deposition, sputtering, chemical vapor deposition method (CVD method) using an inorganic material such as silicon oxide is used. ) Is used.

  In the present invention, the same material or different materials may be used as the first substrate or the second substrate, and there is no particular limitation. Use of a glass substrate is preferable because a liquid crystal display element having excellent heat resistance and dimensional stability can be manufactured. In addition, a plastic substrate is preferable because it is suitable for a manufacturing method using a roll-to-roll method and is suitable for weight reduction or flexibility. For the purpose of imparting flatness and heat resistance, good results can be obtained by combining a plastic substrate and a glass substrate.

  In the embodiments described later, a substrate is used as the material of the first substrate 100 or the second substrate 200.

  In the backplane, the TFT layer 102 and the pixel electrode 103 are provided on the first substrate 100. These are manufactured by a normal array process. A backplane is obtained by providing a passivation film 104 and a first alignment film 105 thereon.

  A passivation film 104 (also referred to as an inorganic protective film) is a film for protecting the TFT layer. Usually, a nitride film (SiNx), an oxide film (SiOx), or the like is formed by a chemical vapor deposition (CVD) technique or the like.

  The first alignment film 105 is a film having a function of aligning liquid crystals, and a polymer material such as polyimide is usually used in many cases. As the coating solution, an alignment agent solution composed of a polymer material and a solvent is used. Since the alignment film may hinder the adhesive force with the sealing material, a pattern is applied in the sealing region. For the application, a printing method such as a flexographic printing method or a droplet discharge method such as an ink jet is used. The applied alignment agent solution is crosslinked and cured by baking after the solvent is evaporated by temporary drying. Thereafter, an alignment process is performed to provide an alignment function.

  The alignment treatment is usually performed by a rubbing method. The polymer film formed as described above is rubbed in one direction using a rubbing cloth made of fibers such as rayon, thereby producing liquid crystal alignment ability.

  Moreover, the photo-alignment method may be used. The photo-alignment method is a method of generating alignment ability by irradiating polarized light on an alignment film containing an organic material having photosensitivity, and does not cause the generation of scratches or dust on the substrate due to the rubbing method. Examples of the organic material in the photo-alignment method include a material containing a dichroic dye. Dichroic dyes include molecular orientation induction or isomerization reaction (eg, azobenzene group), dimerization reaction (eg, cinnamoyl group), photocrosslinking reaction (eg, benzophenone group) due to Weigert effect resulting from photodichroism. Alternatively, those having a group (hereinafter abbreviated as a photo-alignment group) that causes a photoreaction that causes liquid crystal alignment ability, such as a photolysis reaction (eg, polyimide group), can be used. After the solvent is evaporated by temporary drying, the applied alignment agent solution is irradiated with light having an arbitrary deflection (polarized light), whereby an alignment film having alignment ability in an arbitrary direction can be obtained.

  One front plane is provided with a black matrix 202, a color filter 203, a planarization film 201, a transparent electrode 204, and a second alignment film 205 on a second substrate 200.

  The black matrix 202 is produced by, for example, a pigment dispersion method. Specifically, a color resin solution in which a black colorant is uniformly dispersed for forming a black matrix is applied on the second substrate 200 provided with the barrier film 201 to form a colored layer. Subsequently, the colored layer is baked and cured. A photoresist is applied on this and prebaked. After exposing the photoresist through a mask pattern, development is performed to pattern the colored layer. Thereafter, the photoresist layer is peeled off and the colored layer is baked to complete the black matrix 202.

  Alternatively, a photoresist type pigment dispersion may be used. In this case, a photoresist-type pigment dispersion is applied, pre-baked, exposed through a mask pattern, and then developed to pattern the colored layer. Thereafter, the photoresist layer is peeled off and the colored layer is baked to complete the black matrix 202.

  The color filter 203 is manufactured by a pigment dispersion method, an electrodeposition method, a printing method, a dyeing method, or the like. Taking the pigment dispersion method as an example, a color resin liquid in which a pigment (for example, red) is uniformly dispersed is applied onto the second substrate 200, and after baking and curing, a photoresist is applied thereon and prebaked. After the photoresist is exposed through a mask pattern, development is performed and patterning is performed. Thereafter, the photoresist layer is peeled off and baked again to complete the (red) color filter 203. There is no particular limitation on the order of colors to be produced. Similarly, a green color filter 203 and a blue color filter 203 are formed.

  The transparent electrode 204 is provided on the color filter 203 (if necessary, an overcoat layer (201) is provided on the color filter 203 for surface flattening). The transparent electrode 204 preferably has a high transmittance, and preferably has a low electrical resistance. The transparent electrode 204 is formed by sputtering an oxide film such as ITO.

  In addition, a passivation film may be provided on the transparent electrode 204 for the purpose of protecting the transparent electrode 204.

  The second alignment film 205 is the same as the first alignment film 105 described above.

  As mentioned above, although the specific aspect about the said back plane and the said front plane used by this invention was described, it is not limited to this specific aspect in this application, The aspect according to the liquid crystal display element desired is desired. Changes are free.

  The shape of the columnar spacer is not particularly limited, and the horizontal cross section can be various shapes such as a circle and a polygon such as a quadrangle. A polygonal shape is particularly preferable. The protrusion shape is preferably a truncated cone or a truncated pyramid.

  The material of the columnar spacer is not particularly limited as long as it is a sealing material, an organic solvent used for the sealing material, or a material that does not dissolve in liquid crystal, but it may be a synthetic resin (curable resin) in terms of processing and weight reduction. preferable. On the other hand, the protrusion can be provided on the surface of the first substrate in contact with the sealing material by a photolithography method or a droplet discharge method. For these reasons, it is preferable to use a photocurable resin suitable for a photolithography method or a droplet discharge method.

  As an example, a case where the columnar spacer is obtained by a photolithography method will be described. FIG. 2 is a diagram of an exposure process using a columnar spacer preparation pattern formed on a black matrix as a photomask pattern.

  On the transparent electrode 204 of the front plane, a resin solution for forming columnar spacers (not containing a colorant) is applied. Subsequently, the resin layer 402 is baked and cured. A photoresist is applied on this and prebaked. After exposing the photoresist through the mask pattern 401, development is performed to pattern the resin layer. Thereafter, the photoresist layer is peeled off, and the resin layer is baked to complete columnar spacers (302 and 304 in FIG. 1).

  The formation position of the columnar spacer can be determined at a desired position by a mask pattern. Therefore, both the inside of the sealing region of the liquid crystal display element and the outside of the sealing region (sealed material application portion) can be manufactured simultaneously. The columnar spacer is preferably formed so as to be positioned on the black matrix so that the quality of the sealing region does not deteriorate. A columnar spacer manufactured by a photolithography method in this way is sometimes called a column spacer or a photospacer.

  As the material of the spacer, a negative water-soluble resin such as PVA-stilbazo photosensitive resin, a mixture of a polyfunctional acrylic monomer, an acrylic acid copolymer, a triazole initiator, or the like is used. Alternatively, there is a method using a color resin in which a colorant is dispersed in a polyimide resin. In the present invention, there is no particular limitation, and a spacer can be obtained from a known material in accordance with the compatibility with the liquid crystal or the sealing material to be used.

  Thus, after providing a columnar spacer on the surface to be a sealing region on the front plane, a seal material (301 in FIG. 1) is applied to the surface of the back plane that contacts the seal material.

  The material of the sealing material is not particularly limited, and a curable resin composition in which a polymerization initiator is added to an epoxy or acrylic photocurable, thermosetting, or photothermal combination curable resin is used. In order to control moisture permeability, elastic modulus, viscosity, etc., fillers made of inorganic or organic substances may be added. The shape of these fillers is not particularly limited, and includes a spherical shape, a fiber shape, and an amorphous shape. Furthermore, in order to control the cell gap satisfactorily, a spherical or fibrous gap material having a monodisperse diameter is mixed, or in order to further strengthen the adhesive force with the substrate, a fibrous substance that is easily entangled with the protrusions on the substrate is used. You may mix. The diameter of the fibrous material used at this time is desirably about 1/5 to 1/10 or less of the cell gap, and the length of the fibrous material is desirably shorter than the seal coating width.

  The material of the fibrous substance is not particularly limited as long as a predetermined shape can be obtained, and synthetic fibers such as cellulose, polyamide and polyester, and inorganic materials such as glass and carbon can be appropriately selected.

  As a method for applying the sealing material, there are a printing method and a dispensing method, but a dispensing method with a small amount of the sealing material used is desirable. The application position of the sealing material is usually on the black matrix so as not to adversely affect the sealing area. In order to form a liquid crystal dropping region in the next step (so that the liquid crystal does not leak), the sealing material application shape is a closed loop shape.

  Liquid crystal is dropped onto the closed loop shape (sealing region) of the front plane to which the sealing material is applied. Usually a dispenser is used. Since the amount of liquid crystal to be dropped coincides with the volume of the liquid crystal cell, the amount is basically the same as the volume obtained by multiplying the height of the column spacer and the seal application area. However, in order to optimize liquid crystal leakage and display characteristics in the cell bonding process, the amount of liquid crystal to be dropped may be adjusted as appropriate, or the liquid crystal dropping position may be dispersed.

  Next, a back plane is bonded to the front plane on which the sealing material is applied and liquid crystal is dropped. Specifically, the front plane and the back plane are adsorbed on a stage having a mechanism for adsorbing a substrate such as an electrostatic chuck, and the second alignment film on the front plane and the first alignment film on the back plane face each other. In the meantime, it is arranged at a position (distance) where the sealing material does not contact the other substrate. In this state, the system is depressurized. After decompression is completed, the positions of both substrates are adjusted while confirming the bonding position between the front plane and the back plane (alignment operation). When the adjustment of the bonding position is completed, the substrate is brought close to a position where the sealing material on the front plane and the back plane are in contact with each other. In this state, the system is filled with an inert gas, and the pressure is gradually returned to normal pressure while releasing the reduced pressure. At this time, the front plane and the back plane are bonded together by atmospheric pressure, and a cell gap is formed at the height of the columnar spacer. In this state, the sealing material is irradiated with ultraviolet rays to cure the sealing material, thereby forming a liquid crystal cell. Thereafter, a heating step is added in some cases to promote curing of the sealing material. A heating process is often added to enhance the adhesive strength of the sealing material and improve the reliability of electrical characteristics.

  Hereinafter, more preferable embodiments of the liquid crystal display element of the present invention will be described.

  The present invention is a liquid crystal display device comprising a liquid crystal composition containing the compound represented by the general formula (N) and having a dielectric anisotropy at 25 ° C. of greater than 0 and 5 or less.

  In addition, the liquid crystal display element includes a compound represented by the general formula (N) and a compound represented by the general formula (M), the general formula (PN), the general formula (K), and the general formula (L). It is preferable to include a liquid crystal composition including at least one selected from the group and having a dielectric anisotropy at 25 ° C. of greater than 0 and 10 or less (preferably 5 or less).

  A second preferred embodiment of the liquid crystal display device according to the present invention includes a first substrate having an electrode layer including a first alignment layer and a thin film transistor on the surface, and a second substrate having a second alignment layer on the surface. Are arranged so as to face each other and the liquid crystal layer containing the liquid crystal composition is filled between the first substrate and the second substrate, and includes the thin film transistor. The electrode layer includes a plurality of gate wirings and data wirings arranged in a mesh pattern, a thin film transistor provided at each intersection of the gate wiring and the data wiring, a pixel electrode connected to the thin film transistor, and the pixel And a common electrode provided on the first substrate apart from the electrode. The first alignment layer and the second alignment layer provided in the vicinity of the liquid crystal layer are preferably alignment films that induce homogeneous alignment with respect to the liquid crystal composition.

  That is, the liquid crystal display element includes a second polarizing plate, a second substrate, an electrode layer including a thin film transistor (also referred to as a thin film transistor layer), an alignment film, a liquid crystal layer including a liquid crystal composition, and an alignment film. It is preferable that the color filter, the first substrate, and the first polarizing plate are sequentially stacked.

  By providing the common electrode and the pixel electrode separately on the same substrate (or electrode layer), an electric field (E) generated between the common electrode and the pixel electrode can have a planar component. Therefore, for example, when an alignment film that induces homogeneous alignment with respect to the liquid crystal composition is used for the alignment layer, the alignment layer is aligned in the plane direction that is the alignment direction of the alignment film before voltage is applied between the common electrode and the pixel electrode. The liquid crystal molecules that block light, and when a voltage is applied, the liquid crystal molecules rotate horizontally by the electric field (E) applied in the plane direction, and can be arranged along the electric field direction to provide an element that blocks light. .

  Further, the liquid crystal display element according to the present invention may be a so-called color filter on array (COA), or a color filter may be provided between an electrode layer including a thin film transistor and a liquid crystal layer, or the thin film transistor. A color filter may be provided between the electrode layer containing and the second substrate. That is, in the configuration of the liquid crystal display element according to the invention, it is preferable that the color filter 6 is formed on the same substrate side as the first substrate on which the electrode layer 3 including a thin film transistor is formed.

  In the present specification, “on the substrate” includes not only directly contacting the substrate but also indirectly contacting the substrate, which is supported by a so-called substrate.

  Another more preferable embodiment (FFS) of the second embodiment in the liquid crystal display composition according to the present invention includes a first substrate having an electrode layer including a first alignment layer and a thin film transistor on the surface, and a second alignment layer. A liquid crystal display element in which a liquid crystal layer containing a liquid crystal composition is filled between the first substrate and the second substrate. The electrode layer including the thin film transistor includes a plurality of gate wirings and data wirings arranged in a mesh pattern, a thin film transistor provided at each intersection of the gate wiring and the data wiring, and connected to the thin film transistor And a common electrode that is spaced apart from the pixel electrode and arranged in parallel on the first substrate, and the shortest separation distance d between the adjacent common electrode and the pixel electrode It is preferably shorter than the shortest distance G between the alignment layer.

  Note that in this specification, a liquid crystal display element in which the shortest separation distance d between the common electrode and the pixel electrode is longer than the shortest separation distance G between the alignment layers is referred to as an IPS liquid crystal display element. An element in which the shortest distance d from the electrode is shorter than the shortest distance G between the alignment layers is referred to as FFS. Accordingly, the only requirement for the FFS method is that the shortest separation distance d between the adjacent common electrode and the pixel electrode is shorter than the shortest separation distance G between the alignment layers. Therefore, the surface of the common electrode and the surface of the pixel electrode There is no limitation on the positional relationship in the thickness direction. Therefore, as the FSS type liquid crystal display element according to the present invention, as shown in FIGS. 3 to 7, the pixel electrode may be provided on the liquid crystal layer side from the common electrode, and the pixel electrode and the common electrode are on the same plane. May be provided.

  The liquid crystal composition according to the present invention can reduce the induced polarization of the liquid crystal layer, particularly when used for a liquid crystal display element of an FFS driving system (FFS-LCD). Moreover, it is preferable from a viewpoint of a high-speed response and reduction of image sticking.

  An example of a more preferred embodiment of the second embodiment according to the present invention will be described below with reference to FIGS. FIG. 3 is an exploded perspective view schematically showing a structure of one embodiment of the liquid crystal display element, which is a so-called FFS type liquid crystal display element. A liquid crystal display element 10 according to the present invention includes a second polarizing plate 8, a second substrate 7, a color filter 6, an alignment film 4, a liquid crystal layer 5 containing a liquid crystal composition, an alignment film 4, An electrode layer (also referred to as a thin film transistor layer) 3 including a thin film transistor, a first substrate 2 and a first polarizing plate 1 are preferably laminated in sequence. Further, as shown in FIG. 3, the second substrate 7 and the first substrate 2 may be sandwiched between a pair of polarizing plates 1 and 8. Further, in FIG. 3, a color filter 6 is provided between the second substrate 7 and the alignment film 4. Further, a pair of alignment films 4 may be formed on the (transparent) electrode (layer) 3 so as to be close to the liquid crystal layer 5 according to the present invention and to directly contact the liquid crystal composition constituting the liquid crystal layer 5.

  As another suitable form of the liquid crystal display element 10 according to the present invention, a so-called color filter on array (COA) may be used, and the color filter 6 may be provided between the thin film transistor layer 3 and the liquid crystal layer 5. Alternatively, a color filter 6 may be provided between the thin film transistor layer 3 and the first substrate 2.

  The FFS mode liquid crystal display element uses a fringe electric field. When the shortest separation distance d between the adjacent common electrode and the pixel electrode is shorter than the shortest separation distance G between the alignment layers, the common electrode and the pixel electrode A fringe electric field is formed between them, and the horizontal and vertical alignments of the liquid crystal molecules can be used efficiently. That is, in the case of the FFS liquid crystal display element, a horizontal electric field formed in a direction perpendicular to a line forming the comb-teeth of the pixel electrode 21 and a parabolic electric field can be used.

  4 is an enlarged plan view of a region II of the electrode layer 3 (or also referred to as the thin film transistor layer 3) including the thin film transistor formed on the substrate in FIG. In the vicinity of the intersection where the gate line 26 and the data line 25 intersect each other, the thin film transistor 20 including the source electrode 27, the drain electrode 24, and the gate electrode 28 serves as a switch element that supplies a display signal to the pixel electrode 21. 21 is provided. As an example, FIG. 4 shows a configuration in which a flat plate-like common electrode 22 is formed on the back surface of an interdigital pixel electrode 21 via an insulating layer (not shown). The surface of the pixel electrode 21 may be covered with a protective insulating film and an alignment film layer. Note that a storage capacitor 23 for storing a display signal supplied through the data wiring 25 may be provided in a region surrounded by the plurality of gate wirings 26 and the plurality of data wirings 25. Further, a common line 29 is provided in parallel with the gate wiring 26. The common line 29 is connected to the common electrode 22 in order to supply a common signal to the common electrode 22.

  FIG. 5 is an example of a cross-sectional view of the liquid crystal display element taken along the line III-III in FIG. The first substrate 2 on which the electrode layer 3 including the alignment layer 4 and the thin film transistor 20 (11, 12, 13, 14, 15, 16, 17) is formed on the surface, and the second on which the alignment layer 4 is formed on the surface The substrate 7 is spaced apart from the alignment layer at a predetermined gap G, and the liquid crystal layer 5 containing a liquid crystal composition is filled in this space. A gate insulating film 12 is formed on a part of the surface of the first substrate 2, a common electrode 22 is formed on a part of the surface of the gate insulating film 12, and the common electrode 22 and the thin film transistor 20 are further formed. An insulating film 18 is formed so as to cover it. A pixel electrode 21 is provided on the insulating film 18, and the pixel electrode 21 is in contact with the liquid crystal layer 5 through the alignment layer 4. Therefore, the minimum distance d between the pixel electrode and the common electrode can be adjusted as the (average) film thickness of the gate insulating film 12. In other words, in the embodiment of FIG. 5, the distance in the horizontal direction on the substrate between the pixel electrode and the common electrode is zero. The electrode width of the comb-like portion of the pixel electrode 21: l and the width of the gap of the comb-like portion of the pixel electrode 21: m are such that all the liquid crystal molecules in the liquid crystal layer 5 can be driven by the generated electric field. It is preferable to form the width.

  As shown in FIGS. 3 to 7, in the case of the FFS mode liquid crystal display element in which the shortest separation distance d between the adjacent common electrode and the pixel electrode is shorter than the shortest separation distance G between the alignment layers, the major axis direction is When a voltage is applied to the liquid crystal molecules arranged parallel to the alignment direction of the alignment layer, an equipotential line of a parabolic electric field is formed between the pixel electrode 21 and the common electrode 22 between the pixel electrode 21 and the common electrode 22. The liquid crystal molecules in the liquid crystal layer 5 rotate in the liquid crystal layer 5 along the formed electric field and function as a switching element. More specifically, for example, when an alignment film that induces homogeneous alignment with respect to the liquid crystal composition is used for the alignment layer, the plane direction that is the alignment direction of the alignment film before voltage is applied between the common electrode and the pixel electrode When the liquid crystal molecules arranged in the light block and block the light, the common electrode and the pixel electrode are separated from each other on the same substrate (or electrode layer). And the vertical component electric field (fringe field) derived from the edges of these electrodes is generated when the shortest separation distance d between the adjacent common electrode and the pixel electrode is shorter than the shortest separation distance G between the alignment layers. Even liquid crystal molecules having a low dielectric anisotropy can be driven. Therefore, the amount of the compound having a high dielectric anisotropy (Δε), which has a high characteristic of the liquid crystal composition itself, can be reduced as much as possible, so that the liquid crystal composition itself can contain a large amount of a low-viscosity compound. .

  Further, regarding the problems relating to low temperature stability such as precipitation of liquid crystal compounds that occur when a large amount of low viscosity compound is contained as in the liquid crystal composition according to the present invention, general formulas (i) and (M-1) ), More preferably by employing a combination of general formula (i), general formula (M-1), and general formula (L), the liquid crystal according to the present invention can be solved. When the composition is applied to FFS, its characteristics can be exhibited to the maximum extent.

  Since the liquid crystal composition according to the present invention uses a liquid crystal molecule having a relatively low dielectric anisotropy of Δε of 5 or less, the major axis direction of the liquid crystal molecule is aligned along the generated electric field direction. Compared with, liquid crystal molecules having a relatively low dielectric anisotropy with Δε of 5 or less can be driven from the viewpoint that a low voltage drive is possible because the distance between the electrodes is short. Therefore, superior characteristics can be obtained as compared with liquid crystal display elements of drive systems other than the FFS system using liquid crystal molecules having a large dielectric anisotropy.

  The configuration of another preferred embodiment of the second embodiment in the liquid crystal display composition according to the present invention is (FFS), a first substrate having an electrode layer including a first alignment layer and a thin film transistor on the surface, and a second A liquid crystal in which a liquid crystal layer containing a liquid crystal composition is filled between the first substrate and the second substrate. The electrode layer including the thin film transistor, which is a display element, includes a common electrode, a plurality of gate wirings and data wirings arranged in a mesh shape, and a thin film transistor provided at each intersection of the gate wiring and the data wiring And a pixel electrode connected to the thin film transistor, and the pixel electrode is preferably provided so as to protrude from the common electrode toward the second substrate. The first alignment layer and the second alignment layer provided in the vicinity of the liquid crystal layer are preferably alignment films that induce homogeneous alignment with respect to the liquid crystal composition.

  FIG. 6 is another form of a plan view in which a region II of the electrode layer 3 including a thin film transistor (or also referred to as a thin film transistor layer 3) formed on the substrate in FIG. 3 is enlarged. In the vicinity of the intersection where the gate line 26 and the data line 25 intersect each other, the thin film transistor 20 including the source electrode 27, the drain electrode 24, and the gate electrode 28 serves as a switch element that supplies a display signal to the pixel electrode 21. 21 is provided. Further, the pixel electrode 21 may have a structure cut out by at least one notch, and an example thereof is shown in FIG. The pixel electrode 21 has a shape in which the center and both ends of a rectangular flat plate are cut out by a triangular cutout, and the remaining region is cut out by eight rectangular cutouts. Reference numeral 22 denotes a comb tooth body (not shown). The surface of the pixel electrode may be covered with a protective insulating film and an alignment film layer. Note that a storage capacitor 23 for storing a display signal supplied through the data wiring 24 may be provided in a region surrounded by the plurality of gate wirings 25 and the plurality of data wirings 24. Note that the shape and number of the notches are not particularly limited.

  7 is an example of another embodiment of a cross-sectional view of the liquid crystal display element taken along the line III-III in FIG. 6 at the same position in the III-III direction. That is, the difference from the structure of the liquid crystal display element shown in FIG. 5 is that the liquid crystal display element shown in FIG. 5 has a common electrode as a flat plate and a pixel electrode as a comb. On the other hand, as described above, in the liquid crystal display element shown in FIG. 7, the pixel electrode 21 has a rectangular flat plate whose center and both ends are cut out by a triangular cutout, and a remaining area is 8. It has a shape cut out by two rectangular cutouts, and the common electrode has a comb-like structure. Therefore, the minimum separation distance d between the pixel electrode and the common electrode is equal to or greater than the (average) film thickness of the gate insulating film 12 and less than the alignment layer separation distance G. In FIG. 7, the common electrode has a comb-like structure, but the common electrode may be a flat plate in this embodiment. In any case, the FFS mode liquid crystal display element according to the present invention only needs to satisfy the condition that the shortest separation distance d between the adjacent common electrode and the pixel electrode is shorter than the shortest separation distance G between the alignment layers. Further, in the configuration of the liquid crystal display element shown in FIG. 7, the pixel electrode 21 is covered with the protective film 18, but in the configuration of the liquid crystal display element shown in FIG. 5, the pixel electrode 21 is covered with the alignment layer 4. . In the present invention, the pixel electrode may be covered with either a protective film or an alignment film.

  In FIG. 7, a polarizing plate is formed on one surface of the first substrate 2, and a gate insulating film 12 is formed so as to cover the comb-like common electrode 22 formed on a part of the other surface. A pixel electrode 21 is formed on a part of the surface of the gate insulating film 12, and an insulating film 18 is formed so as to cover the pixel electrode 21 and the thin film transistor 20. Further, an alignment layer 4, a liquid crystal layer 5, an alignment layer 4, a color filter 6, a second substrate 7 and a polarizing plate 8 are laminated on the insulating film 18. Therefore, the minimum separation distance d between the pixel electrode and the common electrode is adjusted by both electrode positions, the electrode width of the comb-like portion of the pixel electrode 21: l, or the width of the gap of the comb-like portion of the pixel electrode 21: m. can do.

  As shown in FIG. 7, when the pixel electrode protrudes from the common electrode to the second substrate side and both are provided in parallel on the first substrate, the pixel electrode is provided between the common electrode and the pixel electrode. Therefore, an electric field (E) having a thickness direction component can be applied at the same time because an electric field having a planar direction component is formed and the height in the thickness direction is different between the surface of the pixel electrode and the surface of the common electrode.

  Note that the FFS mode liquid crystal display element uses a fringe electric field, and is particularly limited as long as the shortest distance d between the adjacent common electrode and the pixel electrode is shorter than the shortest distance G between the alignment layers. For example, the plurality of teeth of the comb-shaped pixel electrode and the plurality of teeth of the comb-shaped common electrode are provided on the substrate in a state of being separated and engaged with each other. Also good. In this case, a fringe electric field can be used if the distance between the teeth of the common electrode and the teeth of the pixel electrode is shorter than the shortest distance G between the alignment layers.

  When the composition of the present invention and the liquid crystal composition are used in an FFS mode liquid crystal display device, the effect of high-speed response and reduction of image sticking can be obtained from the viewpoint that Δε of the liquid crystal composition to be used is low.

  EXAMPLES The present invention will be described in further detail with reference to examples below, but the present invention is not limited to these examples. Further, “%” in the compositions of the following Examples and Comparative Examples means “mass%”.

  In the examples, the measured characteristics are as follows.

Tni: Nematic phase-isotropic liquid phase transition temperature (° C.)
Δn: Refractive index anisotropy at 298K (also known as birefringence)
Δε: Dielectric anisotropy at 298K η: Viscosity at 293K (mPa · s)
γ1: rotational viscosity at 298K (mPa · s)
Solubility at low temperature:
For the evaluation of solubility at low temperature, after preparing the liquid crystal composition, 0.5 g of the liquid crystal composition was weighed in a 1 mL sample bottle, and the following was performed in a temperature-controlled test tank for one cycle “−20 ° C. ( 1 hour hold) → temperature rise (0.2 ° C./min)→0° C. (1 hour hold) → temperature rise (0.2 ° C./min)→20° C. (1 hour hold) → temperature drop (−0. 2 ° C./min)→0° C. (1 hour hold) → Cooling temperature (−0.2 ° C./min)→−20° C. ”, and visually generate precipitates from the liquid crystal composition Were observed over time.

  The following abbreviations are used for the description of compounds in the examples.

(Side chain structure and linking structure)
-N -C _n H _{2n + 1} linear alkyl group with n carbon atoms -On -OC _n H _{2n + 1} linear alkoxy group with n carbon atoms -V (or V0) -C = CH ₂ vinyl group -Vn- C = C—C _n H _{2n + 1} 1-alkene of carbon number (n + 1) -F -F fluorine atom F- -F fluorine atom n- CnH _{2n + 1-} linear alkyl group of n carbon atoms nO- CnH _{2n + 1} O - a linear alkoxyl group of carbon number n V- CH ₂ = CH-
-V1 -CH = CH-CH ₃
1V- CH ₃ -CH = CH-
_{-2V -CH 2 -CH 2 -CH = CH} 3
_{V2- CH 3 = CH-CH 2} -CH 2 -
_{-2V1 -CH 2 -CH 2 -CH = CH} -CH 3
_{1V2- CH 3 -CH = CH-CH} 2 -CH 2
-COO- -COO- (ester group)
—CF ₂ O— —CF ₂ O— group (ring structure)

Examples 1 to 9, Comparative Example 1 and Comparative Example 2 As shown in the following table as liquid crystal compositions, the liquid crystal compositions of Examples 1 to 9 and Comparative Examples 1 and 2 were prepared with the compositions shown in the following table. . The measurement of these physical property values and the evaluation of the measurement of low temperature stability were as follows.

  The liquid crystal composition according to the present invention is widely applicable to the fields of liquid crystal display elements and liquid crystal displays.

Claims (8)

The following general formula (N);

(In the general formula ^(N), independently L 1, ^{L 2} Waso respectively, represent a hydrogen atom or a halogen atom, one of ^L 1, ^{L 2} represents a halogen atom, the other is a hydrogen atom Represents
L ³ , L ⁴ and L ⁵ represent a hydrogen atom,
R ¹ⁿ and R ²ⁿ each independently represent an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms,
Z ¹ⁿ and Z ²ⁿ each independently represent a divalent linking group, and ring A ¹ and ring A ² are each independently
(A) a 1,4-cyclohexylene group (one —CH ₂ — present in this group or at least two non-adjacent —CH ₂ — may be replaced by —O—), and ,
(B) a 1,4-phenylene group (one -CH = present in the group or at least two non-adjacent -CH = may be replaced by -N =),
Each of the groups (a) and (b) may be independently substituted with a cyano group, a fluorine atom or a chlorine atom,
a and b each independently represents 0, 1, 2 or 3 ; At least one compound represented by
Formula (L):

(In the above general formula (L), R ^L1 and R ^L2 each independently represent an alkyl group having 1 to 8 carbon atoms, and one or non-adjacent at least two —CH in the alkyl group. Each ₂ -may be independently substituted by -CH = CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-,
OL represents 0, 1, 2 or 3;
B ^L1 , B ^L2 and B ^L3 are each independently
(A) a 1,4-cyclohexylene group (one —CH ₂ — present in this group or at least two non-adjacent —CH ₂ — may be replaced by —O—), and ,
(B) a 1,4-phenylene group (one -CH = present in the group or at least two non-adjacent -CH = may be replaced by -N =),
Each of the groups (a) and (b) may be independently substituted with a cyano group, a fluorine atom or a chlorine atom,
L ^L1 and L ^L2 each independently represent a single bond, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —OCH ₂ —, —CH ₂ O—, —COO—, —OCO—, — OCF ₂ —, —CF ₂ O—, —CH═N—N═CH—, —CH═CH—, —CF═CF— or —C≡C—
When OL is 2 or 3 and a plurality of L ^L2 are present, they may be the same or different, and when OL is 2 or 3 and a plurality of B ^L3 is present, they are the same Or at least one compound represented by the general formula (N), which may be different from or different from each other. General formula (M):

(In the general formula (M), R ^M1 represents an alkyl group having 1 to 8 carbon atoms, and at least one non-adjacent —CH ₂ — in the alkyl group is independently selected. , -CH = CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-,
PM represents 0, 1, 2, 3 or 4;
C ^M1 and C ^M2 are each independently
(D) 1,4-cyclohexylene group (in this group, one —CH ₂ — or at least two —CH ₂ — which are not adjacent to each other may be replaced by —O— or —S—). Good) and
(E) a 1,4-phenylene group (one -CH = present in the group or at least two non-adjacent -CH = may be replaced by -N =),
The group (d) and the group (e) are each independently substituted with a cyano group, a fluorine atom or a chlorine atom,
K ^M1 and K ^M2 are each independently a single bond, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —OCH ₂ —, —CH ₂ O—, —OCF ₂ —, —CF ₂ O. -, -COO-, -OCO- or -C≡C-
When PM is 2, 3 or 4 and there are a plurality of K ^M1 , they may be the same or different, and when PM is 2, 3 or 4 and there are a plurality of C ^M2 They may be the same or different,
X ^M1 and X ^M3 each independently represent a hydrogen atom, a chlorine atom or a fluorine atom,
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, (N) and the compound represented by the general formula (L) are excluded. The liquid crystal composition according to claim 1, further comprising at least one compound represented by the formula: Formula (K):

(In the general formula (K), each R ^k1 independently represents an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms, and one or non-adjacent 2 in the group) _Two or more —CH ₂ — may be independently substituted by —C≡C—, —O—, —CO—, —COO— or —OCO—, and one or two in the group The above hydrogen atoms may be independently substituted with fluorine atoms,
Ring K ¹ and Ring K ² are each independently a 1,4-cyclohexylene group (one or two or more non-adjacent —CH ₂ — in the group is substituted by —O— or —S—). Or a 1,4-phenylene group (one or two or more non-adjacent —CH═ in the group may be substituted by —N═), and hydrogen in the group Each atom may be independently substituted with a cyano group, a fluorine atom or a chlorine atom,
K ⁰ represents a naphthalene-2,6-diyl group or a 1,4-phenylene group, and each hydrogen atom in the group may be independently substituted with a fluorine atom,
Z ^k1 , Z ^k2 and Z ^k3 are each independently a single bond, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —OCH ₂ —, —CH ₂ O—, —OCF ₂ —, — CF ₂ O—, —CH ₂ CH ₂ CF ₂ O—, —COO—, —OCO— or —C≡C—
n ^k1 and n ^k2 each independently represent 0, 1, 2, 3 or 4, but when n ^k1 and n ^{k2 are} 2 or more, ring K ² and ring K ² may be the same or different. Z ^k1 and Z ^k3 may be the same or different,
X ^k1 and X ^k2 each independently represent a hydrogen atom, a chlorine atom or a fluorine atom,
Y ^k1 independently represents a chlorine atom, a fluorine atom, a cyano group, a trifluoromethyl group, a fluoromethoxy group, a difluoromethoxy group, a trifluoromethoxy group, or a 2,2,2-trifluoroethyl group, A fluorine atom, a trifluoromethyl group, a fluoromethoxy group, a difluoromethoxy group or a trifluoromethoxy group is represented. The liquid crystal composition according to claim 1, comprising a compound selected from the group of compounds represented by:   The liquid crystal composition according to any one of claims 1 to 3, comprising a compound selected from the group of compounds represented by formula (I-1).

(In the general formula (I-1), R ¹¹ Represents an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an alkenyl group having 2 to 8 carbon atoms, and 1 in the alkyl group, alkenyl group, alkoxy group or alkenyloxy group. One or more hydrogen atoms may be substituted with a fluorine atom, and the methylene group in the alkyl group, alkenyl group, alkoxy group or alkenyloxy group is substituted with an oxygen atom unless the oxygen atoms are continuously bonded. It may be substituted with a carbonyl group as long as the carbonyl group is not continuously bonded,
R ¹² Represents an alkenyl group having 2 to 8 carbon atoms. )   The liquid crystal composition according to claim 1, wherein b is 0 in the general formula (N).   The liquid crystal display element which uses the liquid-crystal composition of any one of Claims 1-4.   A liquid crystal display element for IPS mode, OCB mode, ECB mode, VA mode or FFS mode, wherein the liquid crystal composition according to claim 1 is used.   A liquid crystal display using the liquid crystal display element according to claim 6.

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