JP2006206887A - Liquid crystal composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal composition having negative dielectric anisotropy of a large absolute value and low viscosity, and a liquid crystal display device of a VA type or the like using the same. <P>SOLUTION: The liquid crystal composition comprises a compound represented by general formula (I) and a compound represented by general formula (II). The combination of the liquid crystalline compounds gives the lowly viscous liquid crystalline composition having negative dielectric anisotropy while practically maintaining physical properties such as refractive index anisotropy or the like. The use of the composition provides the excellently reliable liquid crystal display device capable of maintaining high electric voltage holding ratio to a high temperature range. The display is very practical as a liquid crystal display for a VA method, an ECB method, an IPS method or the like. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a nematic liquid crystal composition having a negative dielectric anisotropy Δε useful as an electro-optical liquid crystal display material, and a liquid crystal display device using the same.

  The liquid crystal display element is used in various electric appliances for home use, measuring instruments, automobile panels, word processors, electronic notebooks, printers, computers, televisions, etc., including clocks and calculators. Typical liquid crystal display methods include TN (twisted nematic), STN (super twisted nematic), DS (dynamic light scattering), GH (guest / host), and IPS (in-plane switching). Type, OCB (optical compensation birefringence) type, ECB (voltage controlled birefringence) type, VA (vertical alignment) type, CSH (color super homeotropic) type, FLC (ferroelectric liquid crystal), etc. . As a driving method, multiplex driving is generally used instead of conventional static driving, and the active matrix (AM) method driven by a TFT (thin film transistor), TFD (thin film diode) or the like has become mainstream recently. ing.

In these display systems, the IPS type, ECB type, VA type, CSH type, and the like have a feature that a liquid crystal material having a negative dielectric anisotropy (Δε) is used, unlike currently used TN type and STN type. . Among these, VA type display by AM driving is currently most expected in application to a display element that requires a high speed and a wide viewing angle, such as a television.
A liquid crystal material used in a display method such as a VA type is required to have low voltage driving, high speed response, and a wide operating temperature range. That is, the dielectric anisotropy is negative, the absolute value is large, the viscosity is low, and a high nematic phase-isotropic liquid phase transition temperature (Tni) is required. In addition, it is necessary to adjust the refractive index anisotropy of the liquid crystal material to an appropriate range according to the cell gap from the setting of Δn × d, which is the product of the refractive index anisotropy (Δn) and the cell gap (d). is there. When applying a liquid crystal display element to a television or the like, high-speed response is important, and a liquid crystal material having a low viscosity is required.

  As a liquid crystal material having a negative dielectric anisotropy, a liquid crystal compound having the following 2,3-difluorophenylene skeleton (see Patent Document 1) is disclosed.

（式中、R及びR'は炭素数１から１０のアルキル基又はアルコキシ基を表す。）
しかし、これらの化合物を用いた誘電率異方性が負の液晶組成物は、液晶テレビ等の高速応答が要求される液晶組成物においては十分に低い粘性を実現するに至っていない。

(In the formula, R and R ′ represent an alkyl group having 1 to 10 carbon atoms or an alkoxy group.)
However, a liquid crystal composition having a negative dielectric anisotropy using these compounds has not yet achieved a sufficiently low viscosity in a liquid crystal composition that requires a high-speed response such as a liquid crystal television.

On the other hand, the compounds represented by the general formula (I) of the present invention have already been disclosed (see Patent Document 2). However, by using these compounds and any other compounds, the dielectric anisotropy is negative. There is no specific disclosure about whether the characteristics of the nematic liquid crystal composition can be improved.
Therefore, development of a liquid crystal composition having a negative dielectric anisotropy and a large absolute value has been desired.

JP-A-8-104869 Special table hei 11-508890

  The problem to be solved by the present invention is to provide a liquid crystal composition having a large absolute value and a negative dielectric anisotropy without improving or deteriorating physical properties such as refractive index anisotropy and viscosity. Another object is to provide a VA type liquid crystal display element using the same.

  As a result of intensive studies to solve the above problems, the present invention has the general formula (I)

(In the formula, R ¹ represents an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms, and one CH ₂ group present in these groups or two or more non-adjacent CHs. _Two groups may be substituted with O and / or S, and one or more hydrogen atoms present in these groups may be substituted with F or Cl, and R ² has 1 to Represents an alkyl group having 10 carbon atoms, an alkoxyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkenyloxy group having 3 to 10 carbon atoms,
X represents a hydrogen atom or a fluorine atom,
J _{is, -CH 2 CH 2 -, -} CH = CH -, - CH (CH 3) CH 2 -, - CH 2 CH (CH 3) -, - CH (CH 3) CH (CH 3) -, - CF ₂ CF _2- , -CF = CF-, -CH ₂ O-, -OCH _2- , -OCH (CH ₃ )-, -CH (CH ₃ ) O-,-(CH ₂ ) ₄ -,-( _{CH 2) 3 O -, -} O (CH 2) 3 -, - C≡C -, - CF 2 O -, - OCF 2 -, - COO -, - OCO -, - COS -, - SCO- or single Represents a bond,
A represents a trans-1,4-cyclohexylene group, a 1,4-phenylene group which may be substituted with a fluorine atom, or a single bond. )
Containing one or more compounds represented by:
Formula (II)

(式中、R³及びR⁴はそれぞれ独立的に一般式(I)におけるR²と同じ意味を表し、
B¹及びB²はそれぞれ独立的に
(a) トランス-1,4-シクロへキシレン基(この基中に存在する1個のCH₂基又は隣接していない2個のCH₂基は酸素原子又は硫黄原子に置換されてもよい)
(b) (この基中に存在する1個又は2個以上のCH基は窒素原子に置換されてもよい)
(c) 1,4-シクロヘキセニレン基、1,4-ビシクロ[2.2.2]オクチレン基、ピペリジン-1,4-ジイル基、ナフタレン-2,6-ジイル基、デカヒドロナフタレン-2,6-ジイル基及び1,2,3,4-テトラヒドロナフタレン-2,6-ジイル基
からなる群より選ばれる基を表し、上記の基(a)、基(b)又は基(c)はCN又はハロゲンで置換されていてもよく、

(Wherein R ³ and R ⁴ each independently represent the same meaning as R ² in formula (I),
B ¹ and B ² are each independently
(a) trans-1,4-cyclohexylene group (two CH ₂ groups not one CH ₂ group or adjacent present in this group may be substituted with an oxygen atom or a sulfur atom)
(b) (One or more CH groups present in this group may be substituted with a nitrogen atom)
(c) 1,4-cyclohexenylene group, 1,4-bicyclo [2.2.2] octylene group, piperidine-1,4-diyl group, naphthalene-2,6-diyl group, decahydronaphthalene-2,6 Represents a group selected from the group consisting of a -diyl group and a 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, and the group (a), the group (b) or the group (c) is CN or May be substituted with halogen,

Y ¹ and Y ² are independently
-CH ₂ CH _2- , -CH = CH-, -CH (CH ₃ ) CH _2- , -CH ₂ CH (CH ₃ )-, -CH (CH ₃ ) CH (CH ₃ )-, -CF ₂ CF _2- , -CF = CF-, -CH ₂ O-, -OCH _2- , -OCH (CH ₃ )-, -CH (CH ₃ ) O-,-(CH ₂ ) ₄ -,-(CH ₂ ) _{3 O -, - O (CH} 2) 3 -, - C≡C -, - CF 2 O -, - OCF 2 -, - COO -, - OCO -, - COS -, - SCO- or a single bond ,
When there are a plurality of Y ² and B ² , they may be the same or different,
p represents 0, 1 or 2. )
A nematic liquid crystal composition having a negative dielectric anisotropy containing one or more compounds represented by formula (1) is provided, and a liquid crystal display device using the liquid crystal composition is further provided.

  By the combination of the liquid crystal compounds of the present invention, a liquid crystal composition having a low viscosity and a negative dielectric anisotropy was obtained while substantially maintaining the refractive index anisotropy. By using this composition, a highly reliable liquid crystal display element capable of maintaining a high voltage holding ratio up to a high temperature range is provided, and this display is very practical as a liquid crystal display of VA mode, ECB mode, IPS mode, etc. In particular, it is effective for high-speed response without reducing the cell gap.

In the liquid crystal composition of the present invention, the first component contains one or more compounds represented by the general formula (I), preferably 1 to 20 types, more preferably 1 to 15 types. 1 to 10 types are more preferable, and 1 to 8 types are particularly preferable.
The content of the compound represented by the general formula (I) is preferably 3 to 40% by mass, more preferably 5 to 40% by mass, and 5 to 30% by mass. Is particularly preferred. These compounds have a negative dielectric anisotropy with a large absolute value, but when the content is large, there is a tendency to increase the viscosity. Therefore, when low viscosity is important, it is preferable that the content is low. When the negative dielectric anisotropy having a large absolute value is important, it is preferable that the content is large.

In general formula (I), R ¹ and R ² are each independently an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkoxyl group having 1 to 10 carbon atoms, or 3 to C carbon atoms. It preferably represents 10 alkenyloxy groups, but represents an alkyl group having 1 to 5 primes, an alkenyl group having 2 to 5 carbons, an alkoxyl group having 1 to 5 carbons or an alkenyloxy group having 3 to 5 carbons. The alkoxyl group having 1 to 5 carbon atoms is particularly preferable, and the structure of the following formulas (a) to (e) is more preferable for the alkenyl group.

(構造式は右端で環に連結しているものとする。)
Aは、トランス-1,4-シクロヘキシレン基、無置換の1,4-フェニレン基又は単結合を表すことが好ましい。
Xはフッ素原子を表すことが好ましい。

(The structural formula shall be connected to the ring at the right end.)
A preferably represents a trans-1,4-cyclohexylene group, an unsubstituted 1,4-phenylene group or a single bond.
X preferably represents a fluorine atom.

J _{is, -CH 2 CH 2 -, -} CH = CH- (E _{bodies), - CH (CH 3)} CH 2 -, - CH 2 CH (CH 3) -, - CH (CH 3) CH (CH 3 )-, -CF ₂ CF _2- , -CF = CF- (E-form), -CH ₂ O-, -OCH _2- , -OCH (CH ₃ )-, -CH (CH ₃ ) O-,-( CH ₂ ) ₄ -,-(CH ₂ ) ₃ O-, -O (CH ₂ ) _3- , -C≡C-, -CF ₂ O-, -OCF _2- , -COO-, -OCO- or simple Although it is preferable to represent a bond, -CH ₂ CH _2- , -CH = CH- (E form), -CH (CH ₃ ) CH _2- , -CH ₂ CH (CH ₃ )-, -CF ₂ CF ₂ -, -CF = CF- (E form), -CH ₂ O-, -OCH _2- , -OCH (CH ₃ )-, -CH (CH ₃ ) O-, -C≡C-, -CF ₂ O —, —OCF ₂ — or a single bond is more preferable, —OCH ₂ —, —CH ₂ CH ₂ —, —CH═CH— (E form) or a single bond is more preferable.

  More specifically, the general formula (I) is preferably a compound represented by the following general formula (I-A) to general formula (I-E) as a specific structure:

(Wherein, R ¹ and R ² have the same meanings as R ¹ and R ² in the general formula (I).)
As the second component, one or more compounds represented by the general formula (II) are contained, preferably 1 to 12 types, more preferably 1 to 8 types, and more preferably 1 to 6 types. Further preferred.

  The content of general formula (II) is more preferably in the range of 20 to 70% by mass. These compounds have little effect of increasing the absolute value of the dielectric anisotropy, but have the effect of lowering the viscosity. When importance is attached to increasing the absolute value of the property, it is preferable that these contents are small.

In general formula (II), R ³ and R ⁴ are each independently an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, an alkoxyl group having 1 to 10 carbon atoms, or 3 to 10 carbon atoms. R ³ represents an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms, R ⁴ represents an alkyl group having 1 to 10 carbon atoms, and 1 to carbon atoms. More preferably, it represents 10 alkoxyl groups or alkenyl groups having 2 to 10 carbon atoms,
Specifically, R ³ is -CH ₃ , -CH ₂ CH ₃ ,-(CH ₂ ) ₂ CH ₃ ,-(CH ₂ ) ₃ CH ₃ ,-(CH ₂ ) ₄ CH ₃ ,-(CH ₂ ) ₅ CH ₃ ,-(CH ₂ ) ₆ CH ₃ ,-(CH ₂ ) ₇ CH ₃ , -CH = CH ₂ , -CH = CHCH ₃ (E form),-(CH ₂ ) ₂ CH = CH ₂ ,-( CH ₂ ) ₂ CH = CHCH ₃ (E form),-(CH ₂ ) ₄ CH = CH ₂ ,-(CH ₂ ) ₄ CH = CHCH ₃ (E form) or-(CH ₂ ) ₆ CH = CH ₂ Represent,
R ⁴ _{is, -CH 3, -CH 2 CH 3} , - (CH 2) 2 CH 3, - (CH 2) 3 CH 3, - (CH 2) 4 CH 3, - (CH 2) 5 CH 3, -(CH ₂ ) ₆ CH ₃ ,-(CH ₂ ) ₇ CH ₃ , -OCH ₃ , -OCH ₂ CH ₃ , -O (CH ₂ ) ₂ CH ₃ , -O (CH ₂ ) ₃ CH ₃ , -O (CH ₂ ) ₄ CH ₃ , -O (CH ₂ ) ₅ CH ₃ , -O (CH ₂ ) ₆ CH ₃ , -O (CH ₂ ) ₇ CH _3, -CH = CH ₂ , -CH = CHCH ₃ ( E-form),-(CH ₂ ) ₂ CH = CH ₂ ,-(CH ₂ ) ₂ CH = CHCH ₃ (E-form),-(CH ₂ ) ₄ CH = CH ₂ ,-(CH ₂ ) ₄ CH = CHCH More preferably, it represents ₃ (E form) or — (CH ₂ ) ₆ CH═CH ₂ .

B ¹ and B ² are each independently a trans-1,4-cyclohexylene group (one CH ₂ group present in this group or _two non-adjacent CH ₂ groups are substituted with oxygen atoms). 1,4-phenylene group (including one or more CH groups substituted by nitrogen atoms), 1,4-cyclohexenylene group 1,4-bicyclo [2.2.2] octylene group, piperidine-1,4-diyl group, naphthalene-2,6-diyl group, decahydronaphthalene-2,6-diyl group, or 1,2,3,4 -It preferably represents a tetrahydronaphthalene-2,6-diyl group or a substituent in which these hydrogen atoms are substituted with fluorine atoms, trans-1,4-cyclohexylene group, 1,4-phenylene group, fluorine-substituted A 1,4-phenylene group or a 1,4-bicyclo [2.2.2] octylene group is more preferable.

Y ¹ and Y ² are each independently -CH ₂ CH _2- , -CH = CH- (E form), -CH (CH ₃ ) CH _2- , -CH ₂ CH (CH ₃ )-, -CH (CH ₃ ) CH (CH ₃ )-, -CF ₂ CF _2- , -CF = CF- (E form), -CH ₂ O-, -OCH _2- , -OCH (CH ₃ )-, -CH ( CH ₃ ) O-,-(CH ₂ ) ₄ -,-(CH ₂ ) ₃ O-, -O (CH ₂ ) _3- , -C≡C-, -CF ₂ O-, -OCF ₂ -,- COO-, -OCO-, -COS-, -SCO- or a single bond is preferred, but -CH ₂ CH _2- , -CH = CH- (E form), -CH (CH ₃ ) CH _2- , -CH ₂ CH (CH ₃ )-, -CF ₂ CF _2- , -CF = CF- (E form), -CH ₂ O-, -OCH _2- , -OCH (CH ₃ )-, -CH ( CH ₃ ) O—, —C≡C—, —CF ₂ O—, —OCF ₂ — or a single bond is more preferable, and —CH ₂ CH ₂ —, —CH═CH— (E form) or a single bond is further preferable.

  More specifically, the general formula (II) is preferably a compound represented by the following general formula (II-A) to general formula (II-H) as a specific structure.

(In the formula, R ¹³ , R ¹⁵ , R ¹⁷ , R ¹⁹ , R ²¹ , R ²³ , R ²⁵ and R ²⁷ are —CH ₃ , —CH ₂ CH ₃ , — (CH ₂ ) ₂ CH ₃ , — (CH ₂ ) ₃ CH ₃ ,-(CH ₂ ) ₄ CH ₃ ,-(CH ₂ ) ₅ CH ₃ ,-(CH ₂ ) ₆ CH ₃ ,-(CH ₂ ) ₇ CH ₃ , -CH = CH ₂ , -CH = CHCH ₃ (E-form),-(CH ₂ ) ₂ CH = CH ₂ ,-(CH ₂ ) ₂ CH = CHCH ₃ (E-form),-(CH ₂ ) ₄ CH = CH ₂ ,-(CH ₂ ) ₄ CH = CHCH ₃ (E form) or-(CH ₂ ) ₆ CH = CH ₂ is represented, R ¹⁴ , R ¹⁶ , R ¹⁸ , R ²⁰ , R ²² , R ²⁴ , R ²⁶ and R ²⁸ are -CH ₃ , -CH ₂ CH ₃ ,-(CH ₂ ) ₂ CH ₃ ,-(CH ₂ ) ₃ CH ₃ ,-(CH ₂ ) ₄ CH ₃ ,-(CH ₂ ) ₅ CH ₃ ,-(CH ₂ ) ₆ CH ₃ ,,-(CH ₂ ) ₇ CH ₃ , -OCH ₃ , -OCH ₂ CH ₃ , -O (CH ₂ ) ₂ CH ₃ , -O (CH ₂ ) ₃ CH ₃ , -O (CH ₂ ) ₄ CH ₃ , -O (CH ₂ ) ₅ CH ₃ , -O (CH ₂ ) ₆ CH ₃ , -O (CH ₂ ) ₇ CH _3, -CH = CH ₂ , -CH = CHCH ₃ (E form),-(CH ₂ ) ₂ CH = CH ₂ ,-(CH ₂ ) ₂ CH = CHCH ₃ (E form),-(CH ₂ ) ₄ CH = CH ₂ ,-(CH ₂ ) ₄ CH = CHCH ₃ (E form) or- (CH ₂ ) ₆ CH = CH ₂ is represented.)
In the present invention, as an additional component, one or more compounds selected from the compound group consisting of general formula (III-A) to general formula (III-J) having negative dielectric anisotropy are contained. It is also preferable to do.

(Wherein R ²⁹ and R ³⁰ each independently represents an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms, and one CH ₂ group present in these groups or adjacent thereto. Two or more non-CH ₂ groups may be substituted with O and / or S, and one or more hydrogen atoms present in these groups may be substituted with F or Cl, R ³¹ represents an alkyl group having 1 to 10 carbon atoms, even the one CH ₂ group or not adjoining two or more CH ₂ groups present in the group is replaced with O and / or S And one or more hydrogen atoms present in these groups may be replaced by F or Cl.)
Of the compounds consisting of general formula (III-A) to general formula (III-J), compounds represented by general formula (III-A) to general formula (III-F) are more preferred, and general formula (III Particularly preferred are compounds represented by general formula (III-F) from -E).

  The nematic liquid crystal composition of the present invention contains 5 to 40% by mass of one or more compounds selected from the general formula (I), from the general formula (II-A) to the general formula (II-H). It is preferable to contain 20 to 70% by mass of one or more compounds selected from the group consisting of:

  Contains from 5 to 40% by mass of one or more compounds selected from the group consisting of general formula (IA) and general formula (IB), from general formula (II-A) to general formula (II-H) It is more preferable to contain 20 to 70% by mass of one or more compounds selected from the group consisting of:

  Contains from 5 to 40% by mass of one or more compounds selected from the group consisting of general formula (IA) and general formula (IB), from general formula (II-A) to general formula (II-H) One or two compounds selected from the group consisting of general formula (III-A) to general formula (III-J), containing 20 to 70% by mass of one or more compounds selected from the group consisting of It is particularly preferable to contain 10 to 60% by mass of the above compound.

  Contains 5 to 40% by mass of one or more compounds selected from the group consisting of general formula (IA) and general formula (IB), general formula (II-A), general formula (II-D) , Containing 20 to 70% by mass of one or more compounds selected from the group consisting of general formula (II-G) and general formula (II-H), from general formula (III-E) to general formula ( It is particularly preferable to contain 10 to 60% by mass of one or more compounds selected from the compound group consisting of III-F).

  In the present invention, the nematic phase-isotropic liquid phase transition temperature (Tni) is preferably 60 ° C. or higher, more preferably 70 ° C. or higher, and particularly preferably 80 ° C. or higher. The dielectric anisotropy (Δε) at 25 ° C. is preferably −2 or less, more preferably −2.5 or less, and further preferably −3.0 or less. The refractive index anisotropy (Δn) at 25 ° C. is more preferably 0.10 or more, and further preferably 0.12 or more when it corresponds to a thin cell gap. In the case of dealing with a thick cell gap, it is more preferably 0.095 or less, and further preferably 0.085 or less. The viscosity is preferably 40 mPa · s or less, more preferably 30 mPa · s or less, and particularly preferably 20 mPa · s or less.

The nematic liquid crystal composition is useful for a liquid crystal display element, particularly useful for an active matrix driving liquid crystal display element, and can be used for a VA mode, IPS mode or ECB mode liquid crystal display element.
The nematic liquid crystal composition of the present invention may contain a normal nematic liquid crystal, a smectic liquid crystal, a cholesteric liquid crystal and the like in addition to the above compounds.

  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 “% by mass”.

In the examples, the measured characteristics are as follows.
T _NI : Nematic-isotropic phase transition temperature (° C)
Δn: Birefringence at 25 ° C. Δε: Dielectric anisotropy at 25 ° C. η: Viscosity (mPa · s) (20 ° C.)
Example 1
A liquid crystal composition represented by the following structure was prepared and measured for physical properties.

The characteristics of Example 1 were Tni: 84 ° C., Δn: 0.106, Δε: -3.2, and η: 20 mPa · s.
(Comparative Example 1)
As Comparative Example 1, a liquid crystal composition represented by the following structure not containing the compound represented by the general formula (I) was prepared, and the physical properties thereof were measured.

The characteristics of Comparative Example 1 were Tni: 93 ° C., Δn: 0.098, Δε: −2.6, and η: 18 mPa · s.
It can be seen that Example 1 is an excellent liquid crystal composition having a viscosity equal to that of Comparative Example 1 but having a negative Δε having a larger absolute value than Comparative Example 1.
(Example 2)
A liquid crystal composition represented by the following structure was prepared and measured for physical properties.

The characteristics of Example 2 were Tni: 95 ° C., Δn: 0.098, Δε: −3.3, and η: 21 mPa · s.
The liquid crystal composition of Example 2 also has a negative Δε having a large absolute value.

Claims (9)

Formula (I)

(In the formula, R ¹ represents an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms, and one CH ₂ group present in these groups or two or more non-adjacent CHs. _Two groups may be substituted with O and / or S, and one or more hydrogen atoms present in these groups may be substituted with F or Cl, and R ² has 1 to Represents an alkyl group having 10 carbon atoms, an alkoxyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkenyloxy group having 3 to 10 carbon atoms,
X represents a hydrogen atom or a fluorine atom,
J _{is, -CH 2 CH 2 -, -} CH = CH -, - CH (CH 3) CH 2 -, - CH 2 CH (CH 3) -, - CH (CH 3) CH (CH 3) -, - CF ₂ CF _2- , -CF = CF-, -CH ₂ O-, -OCH _2- , -OCH (CH ₃ )-, -CH (CH ₃ ) O-,-(CH ₂ ) ₄ -,-( _{CH 2) 3 O -, -} O (CH 2) 3 -, - C≡C -, - CF 2 O -, - OCF 2 -, - COO -, - OCO -, - COS -, - SCO- or single Represents a bond,
A represents a trans-1,4-cyclohexylene group, a 1,4-phenylene group which may be substituted with a fluorine atom, or a single bond. )
Containing one or more compounds represented by:
Formula (II)

(Wherein R ³ and R ⁴ each independently represent the same meaning as R ² in formula (I),
B ¹ and B ² are each independently
(a) trans-1,4-cyclohexylene group (two CH ₂ groups not one CH ₂ group or adjacent present in this group may be substituted with an oxygen atom or a sulfur atom)
(b) (One or more CH groups present in this group may be substituted with a nitrogen atom)
(c) 1,4-cyclohexenylene group, 1,4-bicyclo [2.2.2] octylene group, piperidine-1,4-diyl group, naphthalene-2,6-diyl group, decahydronaphthalene-2,6 Represents a group selected from the group consisting of a -diyl group and a 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, and the group (a), the group (b) or the group (c) is CN or May be substituted with halogen,
Y ¹ and Y ² are independently
-CH ₂ CH _2- , -CH = CH-, -CH (CH ₃ ) CH _2- , -CH ₂ CH (CH ₃ )-, -CH (CH ₃ ) CH (CH ₃ )-, -CF ₂ CF _2- , -CF = CF-, -CH ₂ O-, -OCH _2- , -OCH (CH ₃ )-, -CH (CH ₃ ) O-,-(CH ₂ ) ₄ -,-(CH ₂ ) _{3 O -, - O (CH} 2) 3 -, - C≡C -, - CF 2 O -, - OCF 2 -, - COO -, - OCO -, - COS -, - SCO- or a single bond ,
When there are a plurality of Y ² and B ² , they may be the same or different,
p represents 0, 1 or 2. )
A nematic liquid crystal composition having a negative dielectric anisotropy containing one or more compounds represented by the formula: General formula (IA) to general formula (IE)

(Wherein, R ¹ and R ² have the same meanings as R ¹ and R ² in the general formula (I).)
The nematic liquid crystal composition of Claim 1 containing the 1 type, or 2 or more types of compound chosen from the compound group represented by these. From general formula (II-A) to general formula (II-H)

(In the formula, R ¹³ , R ¹⁴ , R ¹⁵ , R ¹⁶ , R ¹⁷ , R ¹⁸ , R ¹⁹ , R ²⁰ , R ²¹ , R ²² , R ²³ , R ²⁴ , R ²⁵ , R ²⁶ , R ²⁷ and R ²⁸ represents the same meaning as R ² in formula (I). 3. The nematic liquid crystal composition according to claim 1, comprising one or more compounds selected from the group of compounds represented by formula (I). Contains from 5 to 40% by mass of one or more compounds selected from the group consisting of general formula (IA) and general formula (IB), from general formula (II-A) to general formula (II-G) The nematic liquid crystal composition according to claim 3, wherein the nematic liquid crystal composition contains 20 to 70% by mass of one or more compounds selected from the compound group consisting of: From general formula (III-A) to general formula (III-J)

(Wherein R ²⁹ and R ³⁰ each independently represents an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms, and one CH ₂ group present in these groups or adjacent thereto. Two or more non-CH ₂ groups may be substituted with O and / or S, and one or more hydrogen atoms present in these groups may be substituted with F or Cl, R ³¹ represents an alkyl group having 1 to 10 carbon atoms, even the one CH ₂ group or not adjoining two or more CH ₂ groups present in the group is replaced with O and / or S And one or more hydrogen atoms present in these groups may be replaced by F or Cl.)
The nematic liquid crystal composition according to claim 4, further comprising one or more compounds selected from the group consisting of: Dielectric anisotropy Δε at 25 ° C. is in the range of −2.0 to −10.0, refractive index anisotropy Δn at 25 ° C. is in the range of 0.06 to 0.3, and viscosity at 20 ° C. is in the range of 10 to 40 mPa · s. 6. The nematic liquid crystal composition according to claim 1, wherein the nematic phase-isotropic liquid phase transition temperature Tni is in the range of 70 ° C. to 130 ° C. 6. A liquid crystal display device using the nematic liquid crystal composition according to claim 1. A liquid crystal display element for active matrix driving using the nematic liquid crystal composition according to claim 1. A liquid crystal display element for VA mode, IPS mode or ECB mode, using the nematic liquid crystal composition according to claim 1.