JP4639621B2 - Nematic liquid crystal composition and liquid crystal display device using the same - Google Patents

Description

  The present invention relates to a nematic liquid crystal composition having a 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 general-purpose 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 for 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. In application to televisions and the like, high-speed response is important, so it is necessary to reduce the cell gap, and in order to maintain the value of Δn × d, it is necessary to increase the refractive index anisotropy of the liquid crystal material. is there.

  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.

(In the formula, R and R ′ represent an alkyl group having 1 to 10 carbon atoms or an alkoxy group.)
However, these compounds have a problem that the refractive index anisotropy is not necessarily sufficiently large.
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 also disclosed.

(In the formula, R and R ′ represent an alkyl group having 1 to 10 carbon atoms or an alkoxy group.)
Although these compounds have a large refractive index anisotropy, the compatibility is not so good, so that the nematic stability of the liquid crystal composition at a low temperature is deteriorated.
A liquid crystal composition containing a condensed ring compound having a negative dielectric anisotropy (see Patent Document 2) is also disclosed, but there is no description regarding nematic stability and viscosity at low temperatures. Accordingly, it has been desired to develop a liquid crystal composition having a large refractive index anisotropy having a negative dielectric anisotropy and an excellent nematic stability at a low temperature.

JP-A-8-104869 JP 2002-69449 A

  The problem to be solved by the present invention is to provide a liquid crystal composition having a large refractive index anisotropy having a negative dielectric anisotropy and an excellent nematic stability at a low temperature, and further using this VA type It is in providing a liquid crystal display element.

  As a result of intensive studies to solve the above-mentioned problems, the present invention includes compounds represented by general formula (ID) to general formula (ID) as the first component.

(In the formula, R ¹ to R ⁸ 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 CH ₂ groups that are not present may be substituted with O and / or S, and one or more hydrogen atoms present in these groups may be substituted with fluorine atoms or chlorine atoms. Often,
Z ¹ to Z ⁶ are each 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, and when there are a plurality of Z ¹ to Z ⁶ , they may be the same or different. 30 to 80% by mass of one or more compounds selected from the formula (II) as a second component

(Wherein R ⁹ and R ¹⁰ each independently represent the same meaning as R ¹ in formula (IA),
A represents a 1,4-phenylene group, 2-methyl-1,4-phenylene group, 3-methyl-1,4-phenylene group or trans-1,4-cyclohexylene group which may be substituted with a fluorine atom. Represent,
B and C each independently represent a 1,4-phenylene group, a 2-methyl-1,4-phenylene group, or a 3-methyl-1,4-phenylene group that may be substituted with a fluorine atom;
Z ⁷ and Z ⁸ represent the same meaning as Z ¹ in the general formula (IA),
m is 0 or 1. )
A nematic liquid crystal composition having a negative dielectric anisotropy Δε, characterized by containing 10 to 70% by mass of one or more compounds selected from the compounds represented by: The liquid crystal display element used is provided.

  By combining the liquid crystal compounds of the present invention, a liquid crystal composition having a negative dielectric anisotropy and a large refractive index anisotropy excellent in nematic stability at low temperatures was obtained. 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, this is effective for high-speed response with a thin cell gap.

  In the liquid crystal composition of the present invention, the first component contains one or more compounds from the compound groups represented by general formula (IA) to general formula (ID), but preferably 2 to 20 types. 15 to 15 species are more preferred, and 2 to 12 species are even more preferred.

  The content of one or more compounds selected from the group of compounds represented by formula (IA) to formula (ID) is more preferably in the range of 35 to 75% by mass, and 40 to 70. More preferably, it is in the range of mass%. These compounds have negative dielectric anisotropy with a large absolute value but tend to increase the viscosity. Therefore, when importance is placed on a low viscosity, it is preferable that the content of these compounds is small, and a negative with a large absolute value. When importance is attached to the dielectric anisotropy, it is preferable that these contents are large.

In the compounds represented by general formula (IA) to general formula (ID), R ¹ to R ⁸ are each independently an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or 1 carbon atom. Represents an alkoxyl group having 1 to 10 carbon atoms, an alkyl group having 1 to 7 carbon atoms substituted by an alkoxyl group having 1 to 4 carbon atoms, or an alkenyl group having 2 to 7 carbon atoms substituted by an alkoxyl group having 1 to 5 carbon atoms R ¹ , R ³ , R ⁵ and R ⁷ each independently represents an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms, and R ² , R ⁴ , R ⁶ and R ⁸ More preferably, each independently represents an alkyl group having 1 to 10 carbon atoms or an alkoxyl group having 1 to 10 carbon atoms.

Specifically, R ¹ , R ³ , R ⁵ and R ⁷ are each independently -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 represents - (CH _{2) ^{6 CH = CH 2, R 2}} , R 4, R 6 and R ⁸ are each independently _{-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 More preferably, it represents ₆ CH ₃ or —O (CH ₂ ) ₇ CH ₃ .

Z ¹ to Z ⁶ 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, -CH ₂ CH _2- , -CH = CH- (E form) or a single bond is more preferable. .

  More specifically, the general formulas (IA) to (ID) are preferably compounds represented by the following general formula as specific structures.

(In the formula, R ¹⁵ 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 represents, R ¹⁶ 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 or —O (CH ₂ ) ₇ CH ₃ is represented.
As the second component, the compound represented by the general formula (II) contains one or more compounds, preferably 1 to 15 compounds, more preferably 2 to 12 compounds, and more preferably 3 to 10 compounds. Further preferred.
The content of the general formula (II) is more preferably 15 to 60% by mass, and further preferably 20 to 50% by mass. Since these compounds have an effect of increasing the refractive index anisotropy, it is preferable that the content of these compounds is large when a large refractive index anisotropy is important.

In the general formula (II), R ⁹ and R ¹⁰ 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 1 to 5 carbon atoms. R ⁹ is preferably an alkyl group having 1 to 7 carbon atoms substituted by an alkoxyl group or an alkenyl group having 2 to 7 carbon atoms substituted by an alkoxyl group having 1 to 5 carbon atoms. R ¹⁰ represents an alkyl group having 1 to 10 carbon atoms, an alkoxyl group having 1 to 10 carbon atoms, or an alkenyl group having 2 to 10 carbon atoms. ,
Specifically, R ⁹ 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 ¹⁰ _{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 .

A is a 1,4-phenylene group, 2-methyl-1,4-phenylene group, 3-methyl-1,4-phenylene group or trans-1,4-cyclohexylene group which may be substituted by a fluorine atom Is preferably represented.
B and C each independently represent a 1,4-phenylene group, a 2-methyl-1,4-phenylene group, or a 3-methyl-1,4-phenylene group that may be substituted with a fluorine atom. preferable.

Z ⁷ and Z ⁸ are -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-,- It preferably represents OCO-, -COS-, -SCO- or a single bond, 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 —, —COO— or a single bond is more preferable.

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

(In the formula, R ¹⁷ represents —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 represents, R ¹⁸ 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 ₃ (E form) or — (CH ₂ ) ₆ CH═CH ₂ is represented.)
The nematic liquid crystal composition of the present invention comprises one or more compounds selected from general formula (IA-1) and general formula (IA-2), and from general formula (IC-1) to general formula (IC- It is preferable to contain one or more compounds selected from the group consisting of 4) and one or more compounds selected from general formula (IIA) and general formula (IIB).

  In the present invention, the nematic phase-isotropic liquid phase transition temperature (Tni) is more preferably 75 ° C. or higher, and further preferably 85 ° C. or higher. The smectic phase-nematic phase transition temperature (Tsn) is preferably −20 ° C. or lower, and more preferably −30 ° C. or lower. The dielectric anisotropy (Δε) at 25 ° C. is more preferably −2.5 or less, and further preferably −3.5 or less. The refractive index anisotropy (Δn) at 25 ° C. is more preferably 0.10 or more, and further preferably 0.13 or more.

  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.

Tni: Nematic phase-isotropic liquid phase transition temperature (° C)
Tsn: Smectic phase-nematic phase transition temperature (℃)
Δn: Refractive index anisotropy at 25 ° C. Δε: Dielectric anisotropy at 25 ° C. (Example 1)

The characteristics of Example 1 were Tni: 77 ° C, Tsn: -44 ° C, Δn: 0.109, and Δε: -3.8.
Moreover, the comparative example 1 which does not contain general formula (I) and general formula (II) as a comparative example was prepared.
(Comparative Example 1)

比較例１の特性は、Tni：59℃、Tsn：-46℃、Δn：0.076、Δε：-2.8であった。
実施例１の方が、ネマチック相-等方性液体相転移温度が高く、Δnが大きく、絶対値が大きい負のΔεを有することがわかる。
（実施例２）

The characteristics of Comparative Example 1 were Tni: 59 ° C, Tsn: -46 ° C, Δn: 0.076, Δε: -2.8.
It can be seen that Example 1 has a negative nematic phase-isotropic liquid phase transition temperature, a large Δn, and a large negative Δε.
(Example 2)

実施例２の特性は、Tni：82.6℃、Tsn：-49℃、Δn：0.107、Δε：-3.2であった。
（実施例３）

The characteristics of Example 2 were Tni: 82.6 ° C, Tsn: -49 ° C, Δn: 0.107, and Δε: -3.2.
(Example 3)

The characteristics of Example 3 were Tni: 90 ° C., Tsn: −40 ° C., Δn: 0.145, Δε: −3.8.
Example 4

The characteristics of Example 4 were Tni: 100 ° C., Tni: −25 ° C., Δn: 0.153, Δε: −7.3.
(Comparative Example 2)
As a comparative example, a comparison was made of a liquid crystal composition outside the scope of the present invention as a result of substituting a part of the compound represented by the general formula (I) with a compound having a 2,3-difluoro-1,4-phenylene group. Example 2 was prepared.

The characteristics of Comparative Example 2 were Tni: 67 ° C., Tsn: + 0 ° C., Δn: 0.157, Δε: −2.4.
Comparative Example 2 has a large Δn, but does not have sufficient characteristics as a liquid crystal composition having a negative dielectric anisotropy because Tni is low, Tsn is high, and the absolute value of Δε is small.
Example 4 has Δn equivalent to that of Comparative Example 2, but has high Tni, low Tsn, and large Δε in absolute value.

Claims (9)

As a first component, a group consisting of compounds represented by general formula (IA) to general formula (ID)

(In the formula, R ¹ to R ⁸ 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 CH ₂ groups that are not present may be substituted with O and / or S, and one or more hydrogen atoms present in these groups may be substituted with fluorine atoms or chlorine atoms. Often,
Z ¹ to Z ⁶ are each 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- , -C≡ C—, —CF ₂ O—, —OCF ₂ — or a single bond is represented, and when there are a plurality of Z ¹ to Z ⁶ , they may be the same or different. 1) or two or more compounds selected from the group consisting of 30 to 80% by mass, and the second component is represented by the general formula (II)

(Wherein R ⁹ and R ¹⁰ each independently represent the same meaning as R ¹ in formula (IA),
A is 1,4-phenylene group, 2-fluoro-1,4-phenylene group, 3-fluoro-1,4-phenylene group, 2-methyl-1,4-phenylene group, 3-methyl-1,4- Represents a phenylene group or trans-1,4-cyclohexylene group,
B and C are each independently 1,4-phenylene group, 2-fluoro-1,4-phenylene group, 3-fluoro-1,4-phenylene group , 2-methyl-1,4-phenylene group, 3 -Represents a methyl-1,4-phenylene group,
Z ⁷ and Z ⁸ represent the same meaning as Z ¹ in the general formula (IA),
m represents 0 or 1. )
A nematic liquid crystal composition having a negative dielectric anisotropy, containing one or more compounds represented by the formula (1), wherein the content is 10 to 70% by mass. General formula (IA-1) and general formula (IA-2)

(Wherein R ¹ represents the same meaning as R ¹ in formula (IA), R ¹¹ represents an alkyl group having 1 to 10 carbon atoms, an alkoxyl group having 1 to 10 carbon atoms, and an alkenyl group having 2 to 10 carbon atoms. Or an alkenyloxy group having 3 to 10 carbon atoms.) The nematic liquid crystal composition according to claim 1, comprising one or more compounds selected from the group of compounds represented by: From general formula (IC-1) to general formula (IC-4)

(Wherein R ⁵ represents the same meaning as R ⁵ in formula (IC), R ¹² represents an alkyl group having 1 to 10 carbon atoms, an alkoxyl group having 1 to 10 carbon atoms, and an alkenyl group having 2 to 10 carbon atoms. Or an alkenyloxy group having 3 to 10 carbon atoms.) The nematic liquid crystal composition according to claim 1 or 2, comprising one or more compounds selected from the group of compounds represented by: General formula (IIA) and general formula (IIB)

(In the formula, R ¹³ and R ¹⁴ have the same meaning as R ⁹ in formula (II).)
The nematic liquid crystal composition according to any one of claims 1 to 3, comprising one or more compounds selected from the group of compounds represented by: 1 type or 2 or more types of compounds chosen from the compound group represented by general formula (IA-1) and general formula (IA-2) are contained, and general formula (IC- 4) 1 type or 2 types or more selected from the compound group which contains 1 type, or 2 or more types of compounds chosen from the compound group represented by 4), and is represented by general formula (IIA) and general formula (IIB) The nematic liquid crystal composition of Claim 4 containing the compound of. The dielectric anisotropy Δε at 25 ° C. is in the range of −8 to −2, the refractive index anisotropy Δn at 25 ° C. is in the range of 0.09 to 0.22, and the nematic phase-isotropic liquid phase 6. The nematic liquid crystal composition according to claim 1, wherein the transition temperature (Tni) is in the range of 70 to 130.degree. 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.