JPWO2019013003A1 - Composition and liquid crystal display device using the same - Google Patents

Abstract

The problem to be solved by the present invention is that the composition has a positive Δε, has a liquid crystal phase in a wide temperature range, has a low viscosity, has good solubility at low temperatures, and has a specific resistance and a voltage holding ratio. It is an object of the present invention to provide a liquid crystal composition which is high, stable to heat and light, and has a high elastic constant and a relatively high ε⊥. As the first component, a compound having a positive dielectric anisotropy selected from the group represented by the general formula (A1) and the general formula (A2), and as the second component, a compound represented by the general formula (B) A compound having a selected negative dielectric anisotropy, a compound having a dielectrically neutral property selected from the group represented by formula (C) as a third component, and a positive dielectric anisotropy as a whole mixture. Provided is a liquid crystal composition having properties. In addition, a liquid crystal display device using the composition is provided.

Description

  The present invention relates to a liquid crystal composition suitable for an active matrix device and an active matrix device containing the composition. In particular, the present invention relates to a liquid crystal composition having a positive dielectric anisotropy and an element containing the liquid crystal composition such as an IPS mode, an FFS mode, an ECB mode, a TN mode, an OCB mode, and a PSA mode.

  The liquid crystal display device is used for various measuring instruments such as watches and calculators, panels for automobiles, word processors, electronic organizers, printers, computers, televisions, watches, advertising boards, and the like. Typical classifications based on the display method are TN (twisted nematic) type, STN (super twisted nematic) type, VA (vertical alignment) type using TFT, PSA (polymer sustained alignment) type, and horizontal alignment mode as IP. (In-plane switching) type, FFS (fringe field switching) type, and the like. The liquid crystal compositions used in these liquid crystal display devices are stable against external stimuli such as moisture, air, heat, and light. And it can be driven at a low voltage.

  VA and PSA displays mainly use a liquid crystal composition having a negative Δε, and TN, STN, IPS and FFS types mainly use a liquid crystal composition having a positive dielectric anisotropy (Δε). Is used. These liquid crystal compositions are composed of several to several tens of compounds in order to optimize Δε and refractive index anisotropy (Δn) for each display element. In order to achieve high-speed response, low operating voltage, wide operating temperature range, and high reliability as a device, the liquid crystal composition has a low viscosity (η) while maintaining the absolute value of Δε, Δn, and the like at optimal values. It must have a high nematic phase-isotropic liquid phase transition temperature (Tni), excellent storage stability that does not cause precipitation or phase change at low temperatures, and is also resistant to heat, light, moisture and the like. Must be stable. Further, the IPS type or FFS type of the horizontal alignment type display has a problem that the contrast is inferior to the VA type or the PSA type display in principle, and there is a continuous demand for improvement of the contrast. That is, in the FFS type and IPS type displays, a liquid crystal composition capable of realizing a high contrast when used as a display element is required in addition to various characteristics as a liquid crystal composition conventionally required.

  The black luminance (black level at the time of OFF display) in the FFS type or IPS type display mainly depends on the element configuration. On the other hand, it is known that the liquid crystal composition is also affected by the physical properties of the liquid crystal composition. Generally, a liquid crystal composition having a small Δn and a high elastic constant is effective for improving black display (reducing black luminance). Things are known. However, if a liquid crystal composition having an excessively small Δn is used, a thick cell gap is required to keep the product of the cell gap (d) constant, and the response speed is deteriorated, which is not preferable. On the other hand, when a liquid crystal composition having a high elastic constant is used, the return response speed is increased, and the thickness gap is not required, which is more preferable as a method of reducing black luminance.

  It is known that the transmittance of an FFS or IPS display can be improved by changing the ratio of two component values (ε // and ε⊥) constituting the dielectric anisotropy of the liquid crystal composition. . In particular, in the case of an FFS type display element using a dielectrically positive liquid crystal composition, the liquid crystal molecules immediately above tilt up due to an electric field in a substantially vertical direction generated on a pixel electrode, and thus the transmittance is reduced. There is. As a method for solving this, a method using a dielectrically negative liquid crystal composition, a method using a dielectrically positive liquid crystal composition having a relatively large ε⊥ value, and the like have been proposed. However, in the former, the viscosity of the liquid crystal composition is increased, which is disadvantageous in response speed. For the latter, various liquid crystal compositions have been developed in recent years, but the physical and chemical properties of the liquid crystal composition are in a trade-off relationship, and it is difficult to improve all of them. That is, the absolute value of Δε, Δn, etc. can be adjusted to optimal values, η is small, has high Tni, has excellent storage stability in which precipitation and phase change do not occur at low temperatures, and has heat and light. There is a strong demand for a specific liquid crystal composition that is stable against stimuli such as water and moisture, has a high elastic constant, and exhibits high transmittance when formed into an IPS or FFS type liquid crystal display device. Exist continuously.

  As a liquid crystal composition intended for a lateral electric field type liquid crystal display such as an IPS type or an FFS type, for example, a liquid crystal composition using a dielectrically neutral alkenyl compound represented by the formula (1) or (2) is used. It is disclosed (Patent Documents 1 to 3).

  However, these inventions have not sufficiently responded to the current demands for sophistication, and there has been a demand for the development of liquid crystal compositions that can simultaneously solve the above-mentioned problems.

Table 2004-529214 JP 2009-191264 A JP 2006-328399

  The problem to be solved by the present invention is a composition having a positive Δε, a liquid crystal phase in a wide temperature range, a small viscosity, good storage stability without causing precipitation or phase change at low temperatures, It is an object of the present invention to provide a liquid crystal composition which has high specific resistance and voltage holding ratio, is stable against heat and light, and has a high elastic constant and a relatively high ε⊥. Another object of the present invention is to provide an FFS-type or IPS-type liquid crystal display device which is excellent in high-speed response and reliability, has a wide operating temperature range, and is excellent in contrast.

  The present inventor has studied various liquid crystal compounds and various chemical substances, and found that the above problem can be solved by combining specific liquid crystal compounds, thereby completing the present invention.

  That is, the present invention contains, as a first component, at least one compound having a positive dielectric anisotropy selected from the group represented by the general formulas (A1) and (A2), Contains at least one compound having a negative dielectric anisotropy selected from the group represented by the general formula (B), and has a dielectric component selected from the group represented by the general formula (C) as a third component. It is an object of the present invention to provide a liquid crystal composition which contains a neutral compound and has a positive dielectric anisotropy as a whole mixture.

(Wherein, R ^A1 , R ^A2 , R ^B1 , R ^B2 , R ^C1 and R ^C2 each independently represent an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, a carbon atom Represents an alkenyl group having 2 to 8 carbon atoms or an alkenyloxy group having 2 to 8 carbon atoms,
n ^A1 , n ^A2 and n ^C1 independently of one another, represent 1, 2 or 3;
n ^B1 and n ^B2 independently represent 0, 1, 2 or 3; however, n ^B1 + n ^B2 is 3 or less;
G ^A1 , G ^A2 , G ^B1 and G ^B2 are independent of each other,
(A) 1,4-cyclohexylene group (this is present in the group one -CH ₂ - or nonadjacent two or more -CH ₂ - may be replaced by -O- or -S- And (b) a 1,4-phenylene group (one -CH = or two or more non-adjacent -CH = present in this group may be replaced by -N =)
A hydrogen atom on the group (a) and the group (b) may be independently substituted with a cyano group, a fluorine atom or a chlorine atom;
G ^C1 and G ^C2 independently represent 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,
K is a group selected from the group represented by the following (K-1) to (K-5),

Z ^A1 represents —OCH ₂ —, —CH ₂ O— or a single bond, but at least one Z ^A1 present in the general formula (A1) is not a single bond,
Z ^A2 , Z ^B1 and Z ^B2 independently of one another are —CH ₂ CH ₂ —, —OCH ₂ —, —CH ₂ O—, —OCF ₂ —, —CF ₂ O—, —COO—, —OCO— , -C≡C- or a single bond;
Z ^C1 _{is, -OCH 2 -, - CH 2} O -, - OCF 2 -, - CF 2 O -, - COO -, - OCO -, - CH 2 CH 2 -, - CH = CH -, - C≡ C-, = N-N = or a single bond;
Y ^A11 , Y ^A12 , Y ^A21 and Y ^A22 independently represent a hydrogen atom or a fluorine atom, and X ^A1 and X ^A2 independently represent a fluorine atom, a chlorine atom, a cyano group, a trifluoromethyl Represents a group or a trifluoromethoxy group,
When a plurality of G ^A1 and Z ^A1 are present, they may be the same or different, and when a plurality of G ^A2 and Z ^A2 exist, they may be the same or different;
If G ^B1 and Z ^B1 there are a plurality thereof may be the same or different and they if G ^B2 and Z ^B2 there are a plurality may be the same or different and G ^C1 and Z ^{When a} plurality of ^C1 are present, they may be the same or different. However, the compound represented by the general formula (C) excludes the compound represented by the general formula (B). )
Further, a display element of a TN type (Twisted Nematic), an ECB type (Electrically Controlled Birefringence), an IPS type (In Plane Switching), or an FFS type (Fringe Field Switching) using the composition is provided.

  The liquid crystal composition of the present invention has a wide liquid crystal temperature range, low viscosity, good storage stability without causing precipitation or phase change at low temperatures, and a change in specific resistance and voltage holding ratio which is received by heat or light is extremely small. Therefore, the practicality of the product is high. In addition, a liquid crystal display device using the composition has a wide operating temperature range, high-speed response, excellent reliability, and good storage stability. Further, since the liquid crystal composition has a high elastic constant and a relatively high ε⊥, particularly when used in an FFS type or IPS type display element, the transmittance is high and the black luminance is improved. That is, a high contrast can be realized, which is very useful.

It is the figure which showed (DELTA) (epsilon) and (epsilon) (psi) / (DELTA) (epsilon) of this Example and a comparative example. FIG. 9 is a diagram showing the maximum transmittance in the FFS cells of the example of the present application and the comparative example.

  The present invention provides a compound having a positive dielectric anisotropy (having a value of Δε greater than 1.5) selected from the group represented by the general formulas (A1) and (A2) as a first component. Contains at least one compound having at least one compound having a negative dielectric anisotropy (value of Δε is smaller than −1.5) selected from the group represented by formula (B) as the second component And a compound having a dielectric neutrality (having a value of -1.5 to 1.5) selected from the group represented by the general formula (C) as a third component. It is a liquid crystal composition characterized by having anisotropic anisotropy, and a liquid crystal display device using the same.

  The composition of the present invention contains, as the first component, a dielectrically positive compound selected from the group represented by formulas (A1) and (A2), but one kind may be used. However, two or more kinds can be used in combination. When two or more compounds are used, they may be selected from only the general formula (A1), or may be selected from only the general formula (A2), or at least one compound may be selected from each and combined. May be.

  The preferable content of the compound of the first component is 3% by mass, 6% by mass, 9% by mass, 12% by mass, 15% by mass, and 60% by mass as the lower limit. % By mass, 55% by mass, 50% by mass, 45% by mass, and 40% by mass.

  The compound represented by the general formula (A1) increases the dielectric anisotropy of the liquid crystal composition, appropriately adjusts the refractive index anisotropy, increases the compatibility (low-temperature stability), and further improves the composition. It can be used for increasing the value of ε⊥, and preferred compounds are given by compounds represented by the following formulas (A1-1) to (A1-4).

(Wherein, R ^A1 , G ^A1 and X ^A1 have the same meaning as R ^A1 , G ^A1 and X ^A1 in the general formula (A1) of claim 1, and W ^A1 represents a hydrogen atom, a cyano group, or a fluorine atom. Or represents a chlorine atom.)
The compounds represented by the general formulas (A1-1) and (A1-3) are preferable in terms of improving the compatibility of the liquid crystal composition, and the compounds represented by the general formulas (A1-2) and (A1-4) The compound represented by the formula (A1-3) and the compound represented by the formula (A1-4) are preferable in that they can extend the nematic maximum temperature range of the liquid crystal composition. This is preferable in that it can be increased. Further, for the purpose of increasing the elastic constant of the ^composition, also preferably ^{G A1} is a heterocyclic ring containing an oxygen atom.

The preferable content of the compound represented by the general formula (A1-1) is 3% by mass as a lower limit, 6% by mass, 9% by mass, and 30% by mass as an upper limit, and 25% by mass. % By mass and 20% by mass.
The preferable content of the compound represented by the general formula (A1-2) is 2% by mass as a lower limit, 4% by mass, 6% by mass, and 24% by mass as an upper limit, and 22% by mass. % By mass, 20% by mass and 18% by mass.

  The preferred content of the compound represented by the general formula (A1-3) is 3% by mass as a lower limit, 5% by mass, 7% by mass, 9% by mass, and 25% as an upper limit. % By mass, 20% by mass and 15% by mass.

  The preferred content of the compound represented by the general formula (A1-4) is 2% by mass as a lower limit, 4% by mass, 6% by mass, and 20% by mass as an upper limit, and 18% by mass. % By mass, 16% by mass, and 14% by mass.

  Specific examples of particularly preferable compounds are represented by formulas (A1-1-1) to (A1-1-2), (A1-2-1) to (A1-2-6), (A1-3-1) to (A1-3-1). A1-3-3) and compounds represented by (A1-4-1) to (A1-4-6).

(In the formula, R ^A1 represents the meaning described above.)
Among these, general formulas (A1-2-4), (A1-2-5), (A1-2-6), (A1-3-2), (A1-3-3), (A1-4) -3), (A1-4-4), (A1-4-5), and the compounds represented by (A1-4-6) are compatible with the liquid crystal composition, dielectric anisotropy, ε⊥, It is preferable because characteristics such as viscosity and nematic temperature range can be compatible at a high level.

  Preferred compounds represented by the general formula (A2) are given by compounds represented by the following general formulas (A2-1) to (A2-3).

(Wherein, R ^A2 , G ^A2 and X ^A2 represent the same meaning as R ^A2 , G ^A2 and X ^A2 in the general formula (A1) of claim 1, and W ^A21 and W ^A22 independently of each other, Represents a hydrogen atom, a cyano group, a fluorine atom or a chlorine atom, and ^nA21 represents 0, 1 or 2.)
The compound represented by the general formula (A2-1) is preferable in that the refractive index anisotropy of the composition can be increased, and the compound represented by the general formula (A2-2) and the general formula (A2-3) Is preferred in that the dielectric anisotropy of the composition can be further increased. Further, for the purpose of increasing the elastic constant of the ^composition, also preferably ^{G A2} is a heteroaryl ring containing an oxygen atom.

  The preferable content of the compound represented by the general formula (A2-1) is 3% by mass as a lower limit, 6% by mass, 9% by mass, and 20% by mass as an upper limit, and 17% by mass. % By mass and 14% by mass.

  The preferable content of the compound represented by the general formula (A2-2) is 2% by mass as a lower limit, 4% by mass, 6% by mass, and 18% by mass as an upper limit, and 15% by mass. % By mass and 12% by mass.

  The preferred content of the compound represented by the formula (A2-3) is 2% by mass as a lower limit, 5% by mass, 7% by mass, 9% by mass, and 22% as an upper limit. % By mass, 18% by mass, and 15% by mass.

  Specific examples of particularly preferred compounds are represented by formulas (A2-1-1) to (A2-1-6), (A2-2-1) to (A2-2-2), (A2-3-1) to (A2-3-1). A2-3-6).

( ^RA2 represents the meaning described above.)
Among these, particularly preferred compounds that can be used for the purpose of increasing the compatibility of the composition are those represented by formulas (A2-1-1), (A2-1-2), (A2-2-1), and (A2-2-1). -2), compounds represented by (A2-3-1) and (A2-3-2), particularly preferred compounds which can be used for the purpose of extending the nematic upper limit temperature range are represented by the general formula (A2-1-3) ), (A2-1-4), (A2-1-5), (A2-3-4), (A2-3-5) and (A2-3-6). Particularly preferred compounds which can increase the dielectric anisotropy of the product and further increase the value of ε⊥ are those represented by formulas (A2-3-2), (A2-3-3), and (A2-3-3). 5) and (A2-3-6).

  The composition of the present invention contains, as the second component, a dielectrically negative compound selected from the group represented by the general formula (B). One type may be used, or two or more types may be used. They can be used in combination. The compound of the general formula (B) is used mainly for the purpose of relatively increasing ε⊥ of the composition, and the preferred content in the composition is 3% by mass as a lower limit, and 4% by mass, 5% by mass, 8% by mass, 10% by mass, and as an upper limit, 50% by mass, 45% by mass, 40% by mass, 35% by mass, and 30% by mass. And 25% by mass.

  The compound represented by the general formula (B) needs to simultaneously satisfy high reliability, a wide nematic temperature range, a low viscosity and a high elastic constant when used in the composition, and can be suitably used for those purposes. The compound is given by a compound represented by the following general formulas (B1) to (B6).

^{(Wherein, R B1, R B2, G} B1, Z B1, Z B2, n B1 and ^{n B2 is, R} B1, ^{R B2} in the general formula of claim ^{1 (B), G B1,} Z B1, n B1 and represent the same meaning as ^{n B2, W B31, W B32} , W B33 and ^{W B34} are independently of each other, hydrogen atom, a cyano group, a fluorine atom or a chlorine ^atom, a ^{n B12} is 0, 1 or 2 represents but, ^W B31 a plurality present in the ^{molecule, W B32,} W ^B33 and ^{W B34} may or may not be the same.)
The compounds represented by the general formulas (B1) to (B3) are preferable in terms of improving the compatibility of the composition and giving high reliability, and the compounds represented by the general formulas (B2) and (B3) are more preferable. It is more preferable in that the refractive index anisotropy of the composition can be increased. Since the compounds represented by the general formulas (B4) to (B6) significantly increase ε⊥ of the composition, a desired value of ε⊥ can be obtained with a small amount of addition, and the viscosity of the composition can be reduced. It is preferable in that it contributes. Further, for the purpose of increasing the elastic constant of the ^composition, also preferably ^{G B1} is a heterocyclic containing oxygen atoms.

  The preferred content of the compound represented by the general formula (B1) is 3% by mass as a lower limit, 4% by mass, 6% by mass, 8% by mass, and 35% by mass as an upper limit. , 30% by mass, 28% by mass, 26% by mass, and 24% by mass.

  The preferable content of the compound represented by the general formula (B2) is 3% by mass as a lower limit, 4% by mass, 6% by mass, 8% by mass, and 30% by mass as an upper limit. , 28% by mass, 26% by mass, and 24% by mass.

  The preferred content of the compound represented by the general formula (B3) is 3% by mass as a lower limit, 5% by mass, 7% by mass, 9% by mass, and 20% by mass as an upper limit. And 18% by mass, 16% by mass and 14% by mass.

  The preferable content of the compound represented by the general formula (B4) is 3% by mass as a lower limit, 5% by mass, 7% by mass, and 18% by mass as an upper limit, 16% by mass. And 14% by mass and 12% by mass.

  The preferable content of the compound represented by the formula (B5) is 3% by mass as a lower limit, 5% by mass, 7% by mass, and 18% by mass as an upper limit, 16% by mass. And 14% by mass and 12% by mass.

  The preferable content of the compound represented by the general formula (B6) is 3% by mass as a lower limit, 5% by mass, 7% by mass, and 16% by mass as an upper limit, and 14% by mass. And 12% by mass and 10% by mass.

  Specific examples of particularly preferable compounds are represented by formulas (B1-1) to (B1-8), (B2-1) to (B2-4), (B3-1) to (B3-5), and (B4-1). To (B4-2), (B5-1) to (B5-2), and (B6-1).

^{(R B1} and ^{R B2} represents the abovementioned ^{meaning, R B21} represents an alkyl group having 1 to 8 carbon atoms.)
What constitutes the second component? It can be appropriately selected from the compounds represented by formulas (B1-1) to (B6-1) according to the physical properties required for the composition.

  In the case where a liquid crystal composition having low refractive index anisotropy is required, the compounds represented by formulas (B1-1) to (B1-8) can be preferably used. Can be suitably used the compounds represented by formulas (B1-1) to (B1-6). In addition, ε⊥ of the composition is increased, and excellent compatibility and a wide nematic temperature range are obtained. For this purpose, the compounds represented by formulas (B1-1) to (B1-4) can be suitably used.

  When the viscosity of the composition is important, 1. 1. A method using a compound having a large negative dielectric anisotropy in order to avoid excessively increasing the content of the second component. In order to increase the content of the third component having low viscosity, there is a method of using a compound having a relatively large refractive index anisotropy. Compounds that can be preferably used from the viewpoint of 1 include compounds represented by general formulas (B1-3) and ( B1-4), compounds represented by (B4-1) to (B6-1), and compounds that can be suitably used from the viewpoint of 2 are represented by general formulas (B2-1) to (B3-5). Compounds which can be suitably used when reliability is emphasized are compounds represented by general formulas (B2-1), (B2-2) and (B3-1) to (B3-5). is there.

  The composition of the present invention contains, as the third component, a dielectrically neutral compound selected from the group represented by the general formula (C). One type may be used, or two or more types may be used. Can also be used in combination.

  Preferred compounds represented by the general formula (C) are given by compounds represented by the following formulas (C1) to (C3).

(Wherein, R ^C1 and R ^C2 represent the same meaning as R ^C1 and R ^C2 in the general formula (C) of claim 1;
G ^{C11 to} G ^C12 , G ^{C21 to} G ^C23 , and G ^{C31 to} G ^C34 are independently of each other, 1,4-cyclohexylene group, 1,4-phenylene group, 2-fluoro-1,4 phenylene group or 3 - represents a fluoro-1,4-phenylene ^{group, G C11 ~G C12, G C21} ~G C23, G C31 hydrogen atom on ^{~G C34} may be substituted by fluorine atoms. However, the compounds represented by the general formulas (C1) to (C3) exclude the compounds represented by the general formula (B). )
The preferred content of the compound of the third component is, as a lower limit, 10% by mass, 14% by mass, 18% by mass, 22% by mass, and an upper limit of 90% by mass, 85% by mass. % By mass, 80% by mass, 75% by mass, and 70% by mass.

  The compound represented by the general formula (C1) can be used for the purpose of reducing the viscosity of the liquid crystal composition, appropriately adjusting the refractive index anisotropy, and increasing the compatibility (low-temperature stability). Is given by compounds represented by the following general formulas (C1-1) to (C1-3).

(In the formula, R ^C1 and R ^C2 each independently represent an alkyl group having 1 to 8 carbon atoms, an alkoxy group, an alkenyl group having 2 to 8 carbon atoms, or an alkenyloxy group.)
The compound represented by the general formula (C1-1) is preferable in that the viscosity of the composition can be significantly reduced and the compatibility can be improved, and the compound represented by the general formula (C1-2) is preferably the compatibility of the composition. Is significantly improved, and the compound represented by the general formula (C1-3) is preferable since the viscosity of the composition can be reduced and the refractive index anisotropy can be further increased. These compounds can be used alone or in combination depending on the properties required.

In the compound represented by the general formula (C1-1), one of R ^C1 and R ^C2 is preferably an alkyl group and the other is an alkyl group or an alkoxy group, and more preferably at least one is an alkenyl group. It is particularly preferred that one is an alkyl group and the other is an alkenyl group.

In the compound represented by the general formula (C1-2), each of R ^C1 and R ^C2 is preferably an alkyl group, R ^C1 is an alkyl group or an alkenyl group, and R ^C2 is an alkoxy group. Is more preferred.

In the compound represented by the general formula (C1-3), R ^C1 and R ^C2 are preferably both alkyl groups, and one is an alkyl group and the other is an alkoxy group, or at least one is an alkenyl group and the other is an alkyl group. Is more preferably an alkyl group.

  Preferred specific examples of the compounds represented by the general formulas (C1-1) to (C1-3) include the following general formulas (C1-1-1) to (C1-1-10) and (C1-2-1). ) To (C1-2-6), (C1-3-1) to (C1-3-6).

  Among them, the compounds represented by the general formulas (C1-1-4), (C1-1-7), and (C1--1) as compounds represented by the general formula (C1-1) in order to give the composition a high elastic constant and a low viscosity. It is more preferable to contain any one or more of the compounds represented by 1-9) or (C1-1-10), and particularly preferable to contain the compound represented by the general formula (C1-1-4). It is most preferable that the compounds represented by formulas (C1-1-4) and (C1-1-7) are simultaneously contained. The preferred content of the compound represented by the general formula (C1-1) is 10%, 15%, or 20% as a lower limit, and 70% or 65% as an upper limit. , 60%, 55%, 50%, 45%, and 40%. Further, the compound represented by the general formula (C1-1) generally has a smaller refractive index anisotropy than that of a target liquid crystal composition. Therefore, when selecting the components of the first component and / or the second component, it is preferable to use a compound having a relatively high refractive index anisotropy within a range that does not give a fatal increase in the viscosity of the composition. . Specific examples thereof are as described in the exemplified compounds of the first component and the second component.

  The compound represented by the general formula (C2) can be used for the purpose of reducing the viscosity of the liquid crystal composition, appropriately adjusting the refractive index anisotropy, and expanding the nematic temperature range. It is provided by compounds represented by formulas (C2-1) to (C2-3).

(Wherein R ^C1 and R ^C2 independently represent an alkyl group having 1 to 8 carbon atoms, an alkoxy group, an alkenyl group or an alkenyloxy group having 2 to 8 carbon atoms, and Y ^C1 and Y ^C2 are each One of them represents a fluorine atom and the other represents a hydrogen atom.)
The compound represented by the general formula (C2-1) is preferable in that it can reduce the viscosity of the composition, and achieve both excellent low-temperature stability and a wide nematic temperature range. The compound represented by the general formula (C2-2) Is preferable in that the range of the maximum nematic temperature of the composition can be expanded and a high refractive index anisotropy can be obtained, and the compounds represented by the general formulas (C2-3) and (2-4) are preferably those having a refractive index of This is preferable in that the anisotropy can be significantly increased and the nematic temperature range can be further expanded. These compounds can be used alone or in combination depending on various properties required.

In the compounds represented by formulas (C2-1) and (C2-2), R ^C1 is preferably an alkyl group and R ^C2 is an alkyl group or an alkoxy group, R ^C1 is an alkenyl group, and R ^C2 is an alkyl group. More preferably, it is a group.

In the compound represented by the formula (C2-3), R ^C1 and R ^C2 are preferably both alkyl groups, more preferably one is an alkenyl group and the other is an alkyl group.

  Preferred specific examples of the compounds represented by formulas (C2-1) to (C2-3) include the following formulas (C2-1-1) to (C2-1-6) and (C2-2-1). ) To (C2-2-7), (C2-3-1) to (C2-3-16).

  The compound represented by the general formula (C3) can be used for the purpose of significantly expanding the nematic upper limit temperature range of the liquid crystal composition and appropriately adjusting the refractive index anisotropy. It is provided by compounds represented by (C3-1) to (C3-3).

(R ^C1 and R ^C2 independently represent an alkyl group having 1 to 8 carbon atoms, an alkoxy group, an alkenyl group having 2 to 8 carbon atoms or an alkenyloxy group.)
The compounds represented by the general formulas (C3-1) and (C3-2) are preferable in that they significantly expand the nematic upper limit temperature range of the composition, and the compounds represented by the general formula (C3-3) are preferable. Is preferable in that the range of the maximum temperature of the nematic can be expanded to obtain a higher refractive index anisotropy. These compounds can be used alone or in combination depending on the properties required, but in order to maintain the compatibility of the liquid crystal composition, about 0 to 3 kinds are combined. It is preferably used, and its content is preferably in the range of 0 to 15% by mass, more preferably in the range of 0 to 10% by mass.

In the compounds represented by the general formulas (C3-1) and (C3-2), both R ^C1 and R ^C2 are preferably alkyl groups, and it is also preferable that one or both of them are alkenyl groups.

In the compound represented by the general formula (C3-3), both R ^C1 and R ^C2 are preferably an alkyl group, but it is also preferable that R ^C1 is an alkenyl group and R ^C2 is an alkyl group.

  Preferred specific examples of the compounds represented by formulas (C3-1) to (C3-3) include the following formulas (C3-1-1) to (C3-1-5) and (C3-2-5). 1) to (C3-2-3) and compounds represented by (C3-3-1) to (C3-3-4).

  The composition of the present invention can optionally contain, as the fourth component, a dielectrically positive compound selected from the group represented by the general formula (M). As the compound represented by the general formula (M), one type may be used, or two or more types may be used in combination.

(Wherein, R ^M represents an alkyl group having 1 to 8 carbon atoms, an alkoxy group or an alkenyl group having 2 to 8 carbon atoms, an alkenyloxy group,
n ^M represents 1, 2, or 3;
G ^M is (a) 1,4-cyclohexylene group (this is present in the group one -CH ₂ - or nonadjacent two or more -CH ₂ - is replaced by -O- or -S- And (b) a 1,4-phenylene group (one -CH = or two or more non-adjacent -CH = present in the group may be replaced by -N = Good.)
A hydrogen atom on the group (a) and the group (b) may be each independently substituted with a cyano group, a fluorine atom or a chlorine atom;
Z ^M represents —CH ₂ CH ₂ —, —CF ₂ O—, —COO—, —C≡C—, or a single bond;
When a plurality of G ^M and Z ^M are present, they may be the same or different,
Y ^M1 and Y ^M2 independently represent a fluorine atom or a hydrogen atom,
^XM represents a fluorine atom, a chlorine atom, a trifluoromethyl group, a trifluoromethoxy group, a cyano group, or an alkenyloxy group having 2 to 5 carbon atoms. )
Preferred compounds represented by formula (M) are given by compounds represented by the following formulas (M1) to (M3).

^(Wherein, R ^M, Y ^{M1, Y M2} and ^{X M} represent the same meaning in the general formula (M) and ^{R M,} Y ^{M1, Y M2} and ^{X M, Y M3} is Y in the general formula (M) represents the same meaning as ^{M1, G M1} are as defined ^{G M} in the general formula (M).)
It is preferable to use a compound represented by the general formula (M1) when importance is placed on reliability, and it is preferable to use a compound represented by the general formula (M2) when importance is placed on high refractive index anisotropy. When importance is placed on high dielectric anisotropy, it is preferable to use a compound represented by the general formula (M3). In order to maintain a large value of ε⊥ as a liquid crystal composition, it is preferable to use compounds represented by general formulas (M2) and (M3). As the compound represented by the general formula (M) as the fourth component, one kind of the compounds represented by the general formulas (M1) to (M3) may be used alone in consideration of the above-mentioned various properties. , May be used in combination.

  The preferred content of the compound of the fourth component is 0% by mass, 3% by mass, 6% by mass, 9% by mass, 12% by mass, and 40% by mass as a lower limit. % By mass, 35% by mass, 30% by mass, 25% by mass and 20% by mass.

  Preferred compounds represented by the general formula (M1) are given by compounds represented by the following general formulas (M1-1) to (M1-5).

(Wherein, ^{R M} and ^{X M} represent the same meaning as ^{R M} and ^{X M} in the general formula (M).)
All of the compounds represented by formulas (M1-1) to (M1-6) are preferable in that they do not reduce the reliability of the liquid crystal composition, but emphasis is placed on the compatibility (low-temperature stability) of the liquid crystal composition. In this case, it is preferable to use the compounds represented by the general formulas (M1-1) to (M1-3). When emphasizing a high nematic maximum temperature range, the compounds represented by the general formulas (M1-4) to (M1-5) are preferable. It is preferable to use the compound represented by

  Preferred compounds represented by the general formula (M2) are given by compounds represented by the following general formulas (M2-1) to (M2-7).

(Wherein, R ^M has the same meaning as R ^M in formula (M), and Alkenyl represents an alkenyl group having 2 to 8 carbon atoms.)
All of the compounds represented by formulas (M2-1) to (M2-7) are preferable in that the refractive index anisotropy of the liquid crystal composition can be increased, but the compatibility of the liquid crystal composition (low-temperature stability). When it is important to use the compounds represented by the general formulas (M2-1) and (M2-2), and when a high nematic maximum temperature range is important, the compounds represented by the general formulas (M2-3) to (M2-) It is preferable to use the compound represented by the formula (7). Among them, in order to keep the value of ε⊥ large as the liquid crystal composition, it is preferable to use the compound represented by the general formula (M2-4). On the other hand, in order to stabilize the liquid crystal composition, it is preferable to use a compound represented by the general formula (M2-7).

  Preferred compounds represented by the general formula (M3) are given by compounds represented by the following general formulas (M3-1) to (M3-5).

(Wherein, R ^M has the same meaning as R ^M in formula (M).)
Any of the compounds represented by formulas (M3-1) to (M3-5) is preferable in that the dielectric anisotropy of the liquid crystal composition can be increased, but the compatibility (low-temperature stability) of the liquid crystal composition is high. When emphasizing is preferred, a compound represented by the general formula (M3-1) is preferably used. When emphasizing a high nematic maximum temperature range, the compound is represented by the general formulas (M3-2) to (M3-5). It is preferable to use a compound. In particular, in order to maintain a large value of ε⊥ as a liquid crystal composition, it is preferable to use a compound represented by any one of formulas (M3-3) to (M3-5). In order to increase the anisotropy, it is preferable to use a compound represented by the general formula (M3-2).

  The composition of the present invention can further contain a compound having a terminal group represented by the general formula (Q). These compounds are used for the purpose of increasing the stability of the liquid crystal composition to light and heat.

(The wavy line in the formula means a bond)
Specifically, the compound having a terminal group represented by the general formula (Q) is preferably a compound represented by the following general formulas (Qa) to (Qe).

In the formula, R ^Q1 is preferably a linear alkyl group or a branched alkyl group having 1 to 10 carbon atoms, R ^Q2 is preferably a linear alkyl group or a branched alkyl group having 1 to 20 carbon atoms, R ^Q3 , R ^Q4 is preferably a linear alkyl group having 1 to 8 carbon atoms, a branched alkyl group, a linear alkoxy group or a branched alkoxy group, and L ^Q is a linear alkylene group having 1 to 8 carbon atoms or a branched alkylene group. Preferably, the groups are preferred, and W ¹ and W ² are preferably —CH 2 — or O atoms, preferably exclusively —CH 2 — or exclusively O atoms. Among the compounds represented by the general formulas (Qa) to (Qe), the compounds represented by the general formulas (Qa), (Qc) and (Qe) further include: preferable.

  The composition of the present invention preferably contains one compound represented by the general formula (Q), but may contain two or more compounds. The content is preferably 0.001 to 1%, more preferably 0.001 to 0.1%, and particularly preferably 0.001 to 0.05%.

  The composition according to the present invention may further contain a compound having a terminal group represented by the general formula (R). These compounds can be used for the purpose of increasing the stability of the liquid crystal composition to light and heat, and are used particularly for increasing the stability to ultraviolet light and visible light.

(In the formula, R represents H, O. or an alkyl group or an alkoxy group having 1 to 5 carbon atoms, and a wavy line means a bond.)
Specifically, the compound having a terminal group represented by the general formula (R) is preferably a compound represented by the following general formulas (Ra) to (R-e).

  The composition of the present invention preferably contains one compound having a terminal group represented by the general formula (R), and more preferably contains one to three compounds. The content is preferably 0.001 to 0.5%, more preferably 0.001 to 0.2%, and particularly preferably 0.001 to 0.1%.

  The composition of the present invention can also contain an ultraviolet absorber. The ultraviolet absorber that can be used is not particularly limited, but commercially available ultraviolet absorbers such as benzophenone, benzotriazole, cyanoacrylate, and triazine can be used. It is preferable that one ultraviolet absorber is contained, but two or more ultraviolet absorbers may be contained. The content is preferably 0.001 to 1%, more preferably 0.001 to 0.1%, and particularly preferably 0.001 to 0.05%.

  The composition of the present invention can contain a polymerizable compound in order to produce a polymer-stabilized liquid crystal display device. Examples of the polymerizable compound that can be used include a photopolymerizable monomer that undergoes polymerization by energy rays such as light, and have a liquid crystal skeleton in which a plurality of six-membered rings such as biphenyl derivatives and terphenyl derivatives are connected. And a polymerizable compound. More specifically, general formula (XX)

(Wherein X ²⁰¹ and X ²⁰² each independently represent a hydrogen atom or a methyl group;
Sp ²⁰¹ and Sp ²⁰² are each independently a single bond, an alkylene group having 1 to 8 carbon atoms or —O— (CH ₂ ) _s — (wherein, s represents an integer of 2 to 7, and an oxygen atom is Is preferably bonded to an aromatic ring),
Z ²⁰¹ is _{-OCH 2 -, - CH 2 O} -, - COO -, - OCO -, - CF 2 O -, - OCF 2 -, - CH 2 CH 2 -, - CF 2 CF 2 -, - CH = CH-COO -, - CH = CH-OCO -, - COO-CH = CH -, - OCO-CH = CH -, - COO-CH 2 CH 2 -, - OCO-CH 2 CH 2 -, - CH 2 _{CH 2 -COO -, - CH 2} CH 2 -OCO -, - COO-CH 2 -, - OCO-CH 2 -, - CH 2 -COO -, - CH 2 -OCO -, - CY 1 = CY 2 - (Wherein, Y ¹ and Y ² each independently represent a fluorine atom or a hydrogen atom), —C≡C— or a single bond;
M ²⁰¹ represents a 1,4-phenylene group, a trans-1,4-cyclohexylene group or a single bond, and all 1,4-phenylene groups in the formula have an arbitrary hydrogen atom substituted by a fluorine atom. Is also good. )) Are preferred.

Each of X ²⁰¹ and X ²⁰² is preferably a diacrylate derivative each representing a hydrogen atom, and each is preferably a dimethacrylate derivative having a methyl group, and a compound wherein one represents a hydrogen atom and the other represents a methyl group is also preferred. The polymerization rate of these compounds is the fastest for the diacrylate derivative, the slowest for the dimethacrylate derivative, and the middle for the asymmetric compound, and a preferred embodiment can be used depending on the application. In a PSA display element, a dimethacrylate derivative is particularly preferred.

Sp ²⁰¹ and Sp ²⁰² each independently represent a single bond, an alkylene group having 1 to 8 carbon atoms or —O— (CH ₂ ) _s —, but at least one of them is a single bond in a PSA display element. preferably, the compound or one of the other by a single bond or an alkylene group having 1 to 8 carbon atoms -O- (CH ₂₎ both represent a single bond s _- aspects that represent preferred. In this case, 1 to 4 alkyl groups are preferable, and s is preferably 1 to 4.

Z ²⁰¹ represents —OCH ₂ —, —CH ₂ O—, —COO—, —OCO—, —CF ₂ O—, —OCF ₂ —, —CH ₂ CH ₂ —, —CF ₂ CF ₂ — or a single bond. Is preferable, -COO-, -OCO- or a single bond is more preferable, and a single bond is particularly preferable.

M ²⁰¹ represents a 1,4-phenylene group, a trans-1,4-cyclohexylene group or a single bond, in which an arbitrary hydrogen atom may be substituted by a fluorine atom, wherein the 1,4-phenylene group or the single bond is preferable. When C represents a ring structure other than a single bond, Z ²⁰¹ is preferably a linking group other than a single bond, and when M ²⁰¹ is a single bond, Z ²⁰¹ is preferably a single bond.

From these points, in the general formula (XX), the ring structure between Sp ²⁰¹ and Sp ²⁰² is specifically preferably the following structure.

In Formula (XX), when M ²⁰¹ represents a single bond, and the ring structure is formed with two rings, it is preferable to represent Formula (XXa-1) to Formula (XXa-5) below, It is more preferable to represent the formula (XXa-3) from (XXa-1), and it is particularly preferable to represent the formula (XXa-1).

(In the formula, both ends are bonded to Sp ²⁰¹ or Sp ^202. )
The polymerizable compound having such a skeleton has an alignment regulating force after polymerization that is optimal for a PSA-type liquid crystal display element, and a good alignment state is obtained, so that display unevenness is suppressed or does not occur at all.

  From the above, as the polymerizable monomer, general formulas (XX-1) to (XX-4) are particularly preferable, and among them, general formula (XX-2) is most preferable.

(In the formula, benzene may be substituted by a fluorine atom, and Sp ²⁰ represents an alkylene group having 2 to 5 carbon atoms.)
When a monomer is added to the composition of the present invention, the polymerization proceeds even in the absence of a polymerization initiator, but may contain a polymerization initiator to promote the polymerization. Examples of the polymerization initiator include benzoin ethers, benzophenones, acetophenones, benzyl ketals, acylphosphine oxides, and the like.

The composition containing the polymerizable compound of the present invention is provided with a liquid crystal alignment ability by polymerizing the polymerizable compound contained therein by ultraviolet irradiation, and controls the amount of transmitted light using the birefringence of the composition. Used for a liquid crystal display device. As liquid crystal display elements, AM-LCD (active matrix liquid crystal display element), TN (nematic liquid crystal display element), STN-LCD (super twisted nematic liquid crystal display element), OCB-LCD and IPS-LCD (in-plane switching liquid crystal display element) ), But particularly useful for AM-LCDs, and can be used for transmissive or reflective liquid crystal display devices.

  The liquid crystal display device using the composition of the present invention is excellent in high-speed response and reliability, is useful in realizing a wide operating temperature range, and can be suitably used for a liquid crystal display device for driving an active matrix. In addition, when used for an FFS or IPS display device, it is particularly suitable as a liquid crystal composition for IPS and FFS display devices because it can realize high transmittance and excellent contrast due to reduced black luminance.

  Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples. Further, “%” in the compositions of the following Examples and Comparative Examples means “% by mass”.

  The characteristics measured in the examples are as follows.

T _NI : Nematic phase-isotropic liquid phase transition temperature (° C)
T _-N : Smectic phase (or solid layer) -nematic phase transition temperature (° C)
[Delta] n: 25 refractive index anisotropy n at ° C. _o: using ordinary refractive index Abbe refractometer at 25 ° C., the refractive index was measured for the 589nm light source.

Δε: dielectric anisotropy at 25 ° C. ε⊥: dielectric constant in the vertical direction at 25 ° C. Liquid crystal is sealed in two types of cells (homeotropic alignment, homogeneous alignment, inter-substrate thickness 10 μm) having different alignment treatments, and 1 KHz. Δε was obtained from the difference between εll and ε⊥ obtained by measuring the capacitance by applying the AC electric field of.

η: Bulk viscosity at 20 ° C. (mPa · s)
γ ₁ : rotational viscosity coefficient at 25 ° C. (mPa · s)
Vth: A liquid crystal was sealed in a TN cell having a thickness of 6 μm, and a voltage at which the transmittance changed 10% under a crossed Nicol polarizing plate was measured at 25 ° C.

_{K 11,} K _33:
The liquid crystal is sealed in a homogeneous alignment cell having a thickness of 30 μm, a voltage (V) of 1 KHz is applied from 0 to 30 V, and a change in electric capacity (C) at 25 ° C. is measured. to determine the _{K 11} and _{K 33} from the fitting.

K ₂₂ : A change in electric capacity (C) at 25 ° C. obtained by applying a voltage (V) of 1 KHz from 0 to 30 V to a TN cell having a thickness of 20 μm and measuring a C-V curve obtained. from the threshold voltage (Vc), it was determined _{K 22} according to the following equation.
K ₂₂ = [K ₃₃ -4 [(Vc / π) ² × ε ₀・ Δε-K ₁₁ ]] / 2
Transmittance (T): FFS cell enclosing a liquid crystal composition (cell gap: 3.5 μm, electrode width: 3 μm, distance between electrodes: 4 μm, SiN _x insulating layer thickness: 4000 °, alignment film inclined at 5 ° from the electrode longitudinal direction) Rubbing treatment), the maximum transmittance was measured from the luminance change when a voltage was applied under a crossed Nicol polarizing plate at 25 ° C.

  VHR: A glass cell with an alignment film enclosing a liquid crystal composition (cell gap 3.5 μm, anti-parallel, alignment film using SE-7492 manufactured by Nissan Chemical Co., Ltd.), frequency 60 Hz, applied voltage 5 V, applied pulse 64 μs, Voltage holding ratio (%) measured at 60 ° C.

  VHR after heat resistance test: Voltage holding ratio (%) when the above-mentioned liquid crystal cell was held in a thermostat at 120 ° C. for 1 hour and then measured in the same manner as described above.

Low temperature storage (LTS):
For the evaluation of the storage stability at low temperature, after the composition was prepared, the composition was sealed in an FFS cell having a thickness of 3.5 μm, and this was subjected to a temperature of −20 ° C., −25 ° C., −30 ° C., −40 ° C., etc. The composition was stored in a controlled test tank, and the composition was periodically visually observed for phase change or generation of precipitate. “240 hr” means that no phase change and no precipitation were confirmed after 240 hours.
(Ring structure)

(Side chain structure and connection structure)

(Comparative Examples 1-2)
The liquid crystal composition described in Example 33 of JP-A-2006-328329 and the liquid crystal composition described in Example 2 of JP-A-2009-191624 were prepared. The reason for selecting these is that the composition is described as being suitable for use in IPS-type liquid crystal display devices. The physical property values were transcribed as they were in the literature, and ε⊥ / Δε was newly calculated. In addition, the content rate in a table | surface represents the mass% with respect to a composition.

(Examples 1 to 14)
Hereinafter, a composition satisfying the constitutional requirements of the present application was prepared, and the effect was confirmed. In addition, the content rate in a table | surface represents the mass% with respect to a composition.

  The liquid crystal compositions shown in Table 1 were prepared, and the physical properties thereof were measured. The composition of Example 1 had a wide liquid crystal temperature range, a large? / ?, a small? 1, and a high Kavg. In addition, VHR and VHR after the heat resistance test showed almost no change and high values. When the FFS cell in which the liquid crystal was sealed was measured using an electro-optical property measuring device (Shintech, OPTIPRO), high transmittance and high contrast were exhibited, and the response speed was sufficiently high. Therefore, the liquid crystal composition of Example 1 can be suitably used for an IPS type or FFS type liquid crystal display device.

  The liquid crystal compositions described in Table 2 were prepared, and the physical properties thereof were measured. The composition of Example 2 had a wide liquid crystal temperature range, a large ε⊥ / Δε, an extremely small γ1, and a high Kavg. In addition, VHR and VHR after the heat resistance test showed almost no change and high values. When the FFS cell in which the liquid crystal was sealed was measured using an electro-optical property measuring device (Shintech, OPTIPRO), high transmittance and high contrast were exhibited, and the response speed was sufficiently high. Therefore, the liquid crystal composition of Example 2 can be suitably used for an IPS type or FFS type liquid crystal display device.

  The liquid crystal compositions described in Table 3 were prepared, and the physical properties thereof were measured. The composition of Example 3 had a wide liquid crystal temperature range, a large? / ?, an extremely small? 1, and a high Kavg. In addition, VHR and VHR after the heat resistance test showed almost no change and high values. When the FFS cell in which the liquid crystal was sealed was measured using an electro-optical property measuring device (Shintech, OPTIPRO), high transmittance and high contrast were exhibited, and the response speed was sufficiently high. Therefore, the liquid crystal composition of Example 3 can be suitably used for an IPS type or FFS type liquid crystal display device.

The liquid crystal compositions described in Table 4 were prepared, and the physical properties thereof were measured. The composition of Example 4 had a wide liquid crystal temperature range, a relatively large ε⊥ / Δε, a low driving voltage, and a high Kavg. In addition, VHR and VHR after the heat resistance test showed almost no change and high values. When the FFS cell in which the liquid crystal was sealed was measured using an electro-optical property measuring device (Shintech, OPTIPRO), high transmittance and high contrast were exhibited, and the response speed was sufficiently high. Therefore, the liquid crystal composition of Example 4 can be suitably used for an IPS type or FFS type liquid crystal display device.

  The liquid crystal compositions described in Table 5 were prepared, and the physical properties thereof were measured. The composition of Example 5 had a wide liquid crystal temperature range, a large? / ?, an extremely small? 1, and a high Kavg. In addition, VHR and VHR after the heat resistance test showed almost no change and high values. When the FFS cell in which the liquid crystal was sealed was measured using an electro-optical property measuring device (Shintech, OPTIPRO), high transmittance and high contrast were exhibited, and the response speed was sufficiently high. Therefore, the liquid crystal composition of Example 5 can be suitably used for an IPS type or FFS type liquid crystal display device.

  Liquid crystal compositions described in Table 6 were prepared, and physical properties thereof were measured. The composition of Example 6 had a wide liquid crystal temperature range, a large ε⊥ / Δε, an extremely small γ1, and a high Kavg. In addition, VHR and VHR after the heat resistance test showed almost no change and high values. When the FFS cell in which the liquid crystal was sealed was measured using an electro-optical property measuring device (Shintech, OPTIPRO), high transmittance and high contrast were exhibited, and the response speed was sufficiently high. Therefore, the liquid crystal composition of Example 6 can be suitably used for an IPS type or FFS type liquid crystal display device.

  The liquid crystal compositions described in Table 7 were prepared, and the physical properties thereof were measured. The composition of Example 1 had a wide liquid crystal temperature range, a large? / ?, a small? 1, and a high Kavg. In addition, VHR and VHR after the heat resistance test showed almost no change and high values. When the FFS cell in which the liquid crystal was sealed was measured using an electro-optical property measuring device (Shintech, OPTIPRO), high transmittance and high contrast were exhibited, and the response speed was sufficiently high. Therefore, the liquid crystal composition of Example 7 can be suitably used for an IPS type or FFS type liquid crystal display device.

  Liquid crystal compositions described in Table 8 were prepared, and physical properties thereof were measured. The composition of Example 8 had a wide liquid crystal temperature range, a relatively large ⊥ / Δε, a low driving voltage, and a high Kavg. In addition, VHR and VHR after the heat resistance test showed almost no change and high values. When the FFS cell in which the liquid crystal was sealed was measured using an electro-optical property measuring device (Shintech, OPTIPRO), high transmittance and high contrast were exhibited, and the response speed was sufficiently high. Therefore, the liquid crystal composition of Example 8 can be suitably used for an IPS type or FFS type liquid crystal display device.

  The liquid crystal compositions described in Table 9 were prepared, and the physical properties thereof were measured. The composition of Example 9 had a wide liquid crystal temperature range, a large ε⊥ / Δε, an extremely small γ1, and a high Kavg. In addition, VHR and VHR after the heat resistance test showed almost no change and high values. When the FFS cell in which the liquid crystal was sealed was measured using an electro-optical property measuring device (Shintech, OPTIPRO), high transmittance and high contrast were exhibited, and the response speed was sufficiently high. Therefore, the liquid crystal composition of Example 9 can be suitably used for an IPS type or FFS type liquid crystal display device.

  Liquid crystal compositions shown in Table 10 were prepared, and physical properties thereof were measured. The composition of Example 10 had a wide liquid crystal temperature range, a relatively large ε⊥ / Δε, a small γ1, a low driving voltage, and a high Kavg. In addition, VHR and VHR after the heat resistance test showed almost no change and high values. When the FFS cell in which the liquid crystal was sealed was measured using an electro-optical property measuring device (Shintech, OPTIPRO), high transmittance and high contrast were exhibited, and the response speed was sufficiently high. Therefore, the liquid crystal composition of Example 10 can be suitably used for an IPS type or FFS type liquid crystal display device.

  Liquid crystal compositions described in Table 11 were prepared, and physical properties thereof were measured. The composition of Example 11 had a wide liquid crystal temperature range, a large ε⊥ / Δε, an extremely small γ1, and a high Kavg. In addition, VHR and VHR after the heat resistance test showed almost no change and high values. When the FFS cell in which the liquid crystal was sealed was measured using an electro-optical property measuring device (Shintech, OPTIPRO), high transmittance and high contrast were exhibited, and the response speed was sufficiently high. Therefore, the liquid crystal composition of Example 11 can be suitably used for an IPS type or FFS type liquid crystal display device.

  The liquid crystal compositions described in Table 12 were prepared, and the physical properties thereof were measured. The composition of Example 12 had a wide liquid crystal temperature range, a relatively large ⊥ / Δε, a low driving voltage, and a high Kavg. In addition, VHR and VHR after the heat resistance test showed almost no change and high values. When the FFS cell in which the liquid crystal was sealed was measured using an electro-optical property measuring device (Shintech, OPTIPRO), high transmittance and high contrast were exhibited, and the response speed was sufficiently high. Therefore, the liquid crystal composition of Example 12 can be suitably used for an IPS type or FFS type liquid crystal display device.

  The liquid crystal compositions described in Table 13 were prepared, and the physical properties thereof were measured. The composition of Example 13 had a wide liquid crystal temperature range, a large ε⊥ / Δε, an extremely small γ1, and a high Kavg. In addition, VHR and VHR after the heat resistance test showed almost no change and high values. When the FFS cell in which the liquid crystal was sealed was measured using an electro-optical property measuring device (Shintech, OPTIPRO), high transmittance and high contrast were exhibited, and the response speed was sufficiently high. Therefore, the liquid crystal composition of Example 13 can be suitably used for an IPS type or FFS type liquid crystal display device.

  Liquid crystal compositions described in Table 14 were prepared, and physical properties thereof were measured. The composition of Example 14 had a wide liquid crystal temperature range, a large ε⊥ / Δε, an extremely small γ1, and a high Kavg. In addition, VHR and VHR after the heat resistance test showed almost no change and high values. When the FFS cell in which the liquid crystal was sealed was measured using an electro-optical property measuring device (Shintech, OPTIPRO), high transmittance and high contrast were exhibited, and the response speed was sufficiently high. Therefore, the liquid crystal composition of Example 14 can be suitably used for an IPS type or FFS type liquid crystal display device.

  10 shows the results of measuring the maximum transmittance and the contrast of the FFS cells in which the liquid crystal compositions of Example 7 and Comparative Example 1 are sealed. Note that the maximum transmittance was standardized by setting the transmittance of Comparative Example 1 to 100%. The contrast was calculated as a ratio of the maximum transmittance to the transmittance when the voltage was turned off (black display). It was found that the liquid crystal composition of Example 7 exhibited higher transmittance and higher contrast than the liquid crystal composition of Comparative Example 1 having similar physical properties.

  10 shows the results of measuring the maximum transmittance and contrast of the FFS cells in which the liquid crystal compositions of Example 10 and Comparative Example 2 are sealed. The maximum transmittance was normalized by setting the transmittance of Comparative Example 2 to 100%. The contrast was calculated in the same manner as described above. It was found that the liquid crystal composition of Example 10 exhibited higher transmittance and contrast than the liquid crystal composition of Comparative Example 2 having similar physical properties.

10 shows VHR measurement results of the liquid crystal compositions of Example 7 and Example 10. It was found that the liquid crystal composition of the present invention maintained a high VHR even after the heat test, and was excellent in reliability.

  As described above, the composition of the present invention has a liquid crystal phase in a wide temperature range, has low viscosity, has good solubility at low temperatures, has high specific resistance and voltage holding ratio, and is stable to heat and light. In addition, it has a high elastic constant and relatively high ε⊥ and εε / Δε, and the FFS or IPS type liquid crystal display device using it has excellent high-speed response and reliability, It was found that the temperature range was wide and excellent transmittance and contrast were exhibited.

Claims (10)

As the first component, at least one compound having a positive dielectric anisotropy selected from the group represented by the general formulas (A1) and (A2) is contained,
As a second component, at least one compound having a negative dielectric anisotropy selected from the group represented by the general formula (B) is contained,
A liquid crystal composition containing at least one dielectrically neutral compound selected from the group represented by formula (C) as a third component, and having a positive dielectric anisotropy as a whole mixture.

(Wherein, R ^A1 , R ^A2 , R ^B1 , R ^B2 , R ^C1 and R ^C2 each independently represent an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, a carbon atom Represents an alkenyl group having 2 to 8 carbon atoms or an alkenyloxy group having 2 to 8 carbon atoms,
n ^A1 , n ^A2 and n ^C1 independently of one another, represent 1, 2 or 3;
n ^B1 and n ^B2 independently represent 0, 1, 2 or 3; however, n ^B1 + n ^B2 is 3 or less;
G ^A1 , G ^A2 , G ^B1 and G ^B2 are independent of each other,
(A) 1,4-cyclohexylene group (this is present in the group one -CH ₂ - or nonadjacent two or more -CH ₂ - may be replaced by -O- or -S- And (b) a 1,4-phenylene group (one -CH = or two or more non-adjacent -CH = present in this group may be replaced by -N =)
A hydrogen atom on the group (a) and the group (b) may be independently substituted with a cyano group, a fluorine atom or a chlorine atom;
G ^C1 and G ^C2 independently represent 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,
K is a group selected from the group represented by the following (K-1) to (K-5),

Z ^A1 represents —OCH ₂ —, —CH ₂ O— or a single bond, but at least one Z ^A1 present in the general formula (A1) is not a single bond,
Z ^A2 , Z ^B1 and Z ^B2 independently of one another are —CH ₂ CH ₂ —, —OCH ₂ —, —CH ₂ O—, —OCF ₂ —, —CF ₂ O—, —COO—, —OCO— , -C≡C- or a single bond;
Z ^C1 _{is, -OCH 2 -, - CH 2} O -, - OCF 2 -, - CF 2 O -, - COO -, - OCO -, - CH 2 CH 2 -, - CH = CH -, - C≡ C-, = N-N = or a single bond;
Y ^A11 , Y ^A12 , Y ^A21 and Y ^A22 independently represent a hydrogen atom or a fluorine atom, and X ^A1 and X ^A2 independently represent a fluorine atom, a chlorine atom, a cyano group, a trifluoromethyl Represents a group or a trifluoromethoxy group,
When a plurality of G ^A1 and Z ^A1 are present, they may be the same or different, and when a plurality of G ^A2 and Z ^A2 are present, they may be the same or different;
If G ^B1 and Z ^B1 there are a plurality thereof may be the same or different and they if G ^B2 and Z ^B2 there are a plurality may be the same or different and G ^C1 and Z ^{When a} plurality of ^C1 are present, they may be the same or different. However, the compound represented by the general formula (C) excludes the compound represented by the general formula (B). ) The liquid crystal composition according to claim 1, wherein the first component contains at least one compound having a positive dielectric anisotropy represented by the general formula (A1). The compound according to claim 2, wherein the compound represented by the general formula (A1) contains one or more compounds selected from the compounds represented by the general formulas (A1-1) to (A1-4). Liquid crystal composition.

(Wherein, R ^A1 , G ^A1 and X ^A1 represent the same meaning as R ^A1 , G ^A1 and X ^A1 in the general formula (A1) of claim 1, and W ^A1 represents a hydrogen atom, a cyano group, or a fluorine atom Or represents a chlorine atom.) The liquid crystal composition according to claim 1, wherein the liquid crystal composition contains at least one compound having a positive dielectric anisotropy represented by the general formula (A2) as a first component. The compound according to claim 4, wherein the compound represented by the general formula (A2) contains one or more compounds selected from the compounds represented by the general formulas (A2-1) to (A2-3). Liquid crystal composition.

(Wherein, R ^A2 , G ^A2 and X ^A2 represent the same meaning as R ^A2 , G ^A2 and X ^A2 in the general formula (A1) of claim 1, and W ^A21 and W ^A22 independently of each other, Represents a hydrogen atom, a cyano group, a fluorine atom or a chlorine atom, and ^nA21 represents 0, 1 or 2.) The compound represented by the general formula (B) contains at least one dielectrically negative compound selected from the group represented by the following general formulas (B-1) to (B-6). 6. The liquid crystal composition according to any one of 5.

^{(Wherein, R B1, R B2, G} B1, Z B1, Z B2, n B1 and ^{n B2 is, R} B1, ^{R B2} in the general formula of claim ^{1 (B), G B1,} Z B1, n B1 and represent the same meaning as ^{n B2, W B31, W B32} , W B33 and ^{W B34} are independently of each other, hydrogen atom, a cyano group, a fluorine atom or a chlorine ^atom, a ^{n B12} is 0, 1 or 2 represents but, ^W B31 a plurality present in the ^{molecule, W B32,} W ^B33 and ^{W B34} may or may not be the same.) The compound represented by the following general formulas (C1) to (C3) as the compound represented by the general formula (C), which contains at least one compound that is dielectrically neutral. Liquid crystal composition.

(Wherein, R ^C1 and R ^C2 represent the same meaning as R ^C1 and R ^C2 in the general formula (C) of claim 1;
G ^{C11 to} G ^C12 , G ^{C21 to} G ^C23 , and G ^{C31 to} G ^C34 are independently of each other, 1,4-cyclohexylene group, 1,4-phenylene group, 2-fluoro-1,4 phenylene group or 3 - represents a fluoro-1,4-phenylene ^{group, G C11 ~G C12, G C21} ~G C23, G C31 hydrogen atom on ^{~G C34} may be substituted by fluorine atoms. However, the compounds represented by the general formulas (C1) to (C3) exclude the compounds represented by the general formula (B). ) The compound represented by the general formula (C) contains at least one dielectrically neutral compound represented by the following general formulas (C1-1) to (C3-3). Item 2. The liquid crystal composition according to item 1.

(In the formula, R ^C1 and R ^C2 represent the same meaning as R ^C1 and R ^C2 in the general formula (C) of claim 1, one of Y ^C1 and Y ^C2 represents a fluorine atom, and the other represents a hydrogen atom. Represents.) The liquid crystal composition according to any one of claims 1 to 8, wherein an average value of elastic constants K11 and K33 at 25 ° C is 12 pN or more. An IPS-type or FFS-type liquid crystal display device using the liquid crystal composition according to claim 1.

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