JP2007091796A - Nematic liquid crystal composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal composition for an active matrix-type liquid crystal display element, having a small Δn (refractive index anisotropy) a wide liquid crystal phase temperature range, enabling low-voltage driving, and having a large Δε (dielectric anisotropy) and excellent reliability, and to provide an active matrix-type liquid crystal display element having a wide operating temperature range using the same. <P>SOLUTION: The liquid crystal composition comprises a compound represented by the formula shown in the figure. There are provided a liquid crystal display element and an active matrix liquid crystal display element using the nematic liquid crystal composition. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

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

  Due to the excellent display quality, active matrix liquid crystal display devices are put on the market for portable terminals, liquid crystal televisions, projectors, computers and the like. In the active matrix display method, TFT (thin film transistor) or MIM (metal insulator metal) is used for each pixel, and high voltage holding ratio is regarded as important in this method. Also, in order to obtain a wider viewing angle characteristic, a TFT display combined with IPS and OCB modes and a reflection type of ECB mode have been proposed to obtain a brighter display. In order to cope with such display elements, new liquid crystal compounds or liquid crystal compositions have been proposed (Patent Document 1 and Patent Document 2).

  In twisted nematic liquid crystal display elements (TN-LCD) and super twisted nematic liquid crystal display elements (STN-LCD), the retarder is the product of the refractive index anisotropy (Δn) of the liquid crystal and the thickness (d) of the liquid crystal medium. The foundation (R; R = Δn · d) is set to a certain value (0.4 to 0.45 is often set for TN-LCD).

  In a reflective or transflective LCD, light enters the liquid crystal medium, reflects off the back reflector, and passes through the liquid crystal medium again, so the actual optical path length is doubled compared to the transmissive LCD. Therefore, in order to obtain the same retardation value, it is necessary to reduce Δn of the liquid crystal medium to about half.

  A low Δn liquid crystal composition can be obtained by increasing the content of a bicyclohexane derivative composed only of a cyclohexane ring having a small Δn value. However, these compounds generally have a large Δε, and it has been difficult to reduce the voltage.

  A liquid crystal composition using a phenylcyclohexyldioxane compound has been proposed as a method of increasing Δε that is small in Δn and can be driven at a low voltage (Patent Documents 3 and 4). However, in these examples, ester compounds are used, and there are problems such that defects are likely to occur during long-term operation, and a liquid crystal composition having excellent reliability has not been provided.

  On the other hand, a liquid crystal composition having a small refractive index anisotropy in which a bicyclohexane derivative and a phenylcyclohexyldioxane compound are combined is already known, and a specific example of a preferable compound is disclosed (Patent Document 5). However, since this composition has a narrow liquid crystal phase temperature range, it cannot be used as a practical liquid crystal composition.

  From the above, it has been difficult to obtain a liquid crystal composition having a wide liquid crystal phase temperature range, a small Δn, a large Δε, a low viscosity, and excellent reliability.

JP-A-2-233626 Special Publication 4-501575 Publication JP-A-10-231482 (Example 7 on page 16) JP 2004-149691 A (Example 1 on page 15) JP 2002-533526 A (Example 56 on page 72)

  The problem to be solved by the present invention is to provide a liquid crystal composition for an active matrix liquid crystal display device having a wide liquid crystal phase temperature range, a small Δn, a large Δε, a low viscosity, and excellent reliability. It is another object of the present invention to provide an active matrix liquid crystal display element using this liquid crystal composition and having a wide operating temperature range.

  As a result of intensive studies to solve the above problems, the present invention has the general formula (1) as the first component,

(式中mは0、1又は2であり、nは0、1又は2であり、pは0又は1であり、
環Aは
(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個以上のCH₂基は -O- 及び又は -S- に置き換えられてもよい)
(b) 1,4-フェニレン基(この基中に存在する1個のCH₂基又は隣接していない2個以上のCH₂基は -N- に置き換えられてもよい)
からなる群より選ばれる基であり、上記の基(a)、基(b)はCH₃又はハロゲンで置換されていても良く、
Z¹はそれぞれ独立的には、-CH₂O-、-OCH₂-、-CF₂O-、-OCF₂-、-CH₂CH₂-、-CF₂CF₂-、-CH=CH-、-(CH₂)₄-、-CH=CH-CH₂CH₂-、-CH₂CH₂-CH=CH- 又は単結合であり、
Q¹は-OCH2-、-OCF2-、-OCHF-、-CF2-、または単結合であり、
X¹〜X³はそれぞれ独立してH、F又はClである。)で表される化合物群から選ばれる1種又は2種以上の化合物を含有することを特徴とするアクティブマトリクス型液晶表示素子用液晶組成物及び当該液晶組成物を構成部材とする液晶表示素子を提供する。

(In the formula, m is 0, 1 or 2, n is 0, 1 or 2, p is 0 or 1,
Ring A is
(a) trans-1,4-cyclohexylene group (one CH ₂ group present in this group or two or more non-adjacent CH ₂ groups are replaced by -O- and / or -S- (May be)
(b) 1,4-phenylene group (one CH ₂ group present in this group or two or more non-adjacent CH ₂ groups may be replaced by -N-)
A group selected from the group consisting of: the group (a), the group (b) may be substituted with CH ₃ or halogen,
Z ¹ is each independently -CH ₂ O-, -OCH _2- , -CF ₂ O-, -OCF _2- , -CH ₂ CH _2- , -CF ₂ CF _2- , -CH = CH- _{, - (CH 2) 4 -} , - CH = CH-CH 2 CH 2 -, - a CH ₂ CH ₂ -CH = CH- or a single bond,
Q ¹ is -OCH2-, -OCF2-, -OCHF-, -CF2-, or a single bond,
X ^{1 to} X ³ are each independently H, F or Cl. A liquid crystal composition for an active matrix type liquid crystal display element comprising one or two or more compounds selected from the group of compounds represented by the formula: and a liquid crystal display element comprising the liquid crystal composition as a constituent member provide.

  The present invention finds an even-odd effect of the alkylene chain length of a liquid crystal compound, maintains a low refractive index anisotropy (Δn = 0.05 to 0.13), has a stable nematic phase at a low temperature, and has a wide liquid crystal phase temperature range. Thus, a liquid crystal composition for an active matrix liquid crystal display device having a high dielectric anisotropy, low viscosity and excellent reliability was obtained. By using this composition, an active matrix liquid crystal display element having a wide operating temperature range is provided, which is very practical as a liquid crystal display in a reflective or transflective mode.

In the liquid crystal composition of the present invention, the first component contains one or two or more types from the compound group represented by the general formula (1), preferably 1 to 5 types, more preferably 1 to 3 types. preferable.
The content of one or more compounds selected from the compound group represented by the general formula (1) as the first component is preferably in the range of 5 to 30% by mass, and 10 to 20% by mass. More preferably, it is the range. M is 0, 1 or 2, but 0 or 1 is preferable, and n is 0, 1 or 2, but 0 or 1 is preferable.

Z ¹ _{is, -CH 2 O -, - OCH} 2 -, - CF 2 O -, - OCF 2 -, - CH 2 CH 2 -, - CF 2 CF 2 -, - CH = CH -, - (CH 2 _{) 4 -, - CH = CH} -CH 2 CH 2 -, - CH 2 CH 2 -CH = CH- , or is a single _{bond, -CF 2 O -, - OCF} 2 -, - CH 2 CH 2 -, -CF ₂ CF _2- , -CH = CH- or a single bond is preferred, -CF ₂ O-, -OCF _2- , -CH ₂ CH ₂ -or a single bond is more preferred, -CH ₂ CH _2- or a single bond Bonding is particularly preferred. Q ¹ is _{-OCH 2 -, - OCF 2 -} , - OCHF -, - CF 2 -, or is a single _{bond, -OCF 2 -, - CF 2} -, or a single bond, more preferably a single bond is more preferable . X ^{1 to} X ³ are each independently H, F or Cl, but —H and —F are preferred, and X ² is preferably F.
More specifically, as a specific structure of the general formula (1), the following general formula (1a)

(式中m、n及びX³は一般式(1)におけると同じ意味を表す。) が好ましく、次の化合物が特に好ましい。

(Wherein m, n and X ³ represent the same meaning as in general formula (1)), and the following compounds are particularly preferred.

  In order to adjust the physical properties of the composition and to achieve lower viscosity and lower voltage, as a second component, the general formula (2)

(式中、R¹、R²はそれぞれ独立的に炭素数1〜15のアルキル基又は炭素数2〜15のアルケニル基であり、この基は非置換であるか、あるいは置換基として少なくとも1個のハロゲン基を有しており、そしてこれらの基中に存在する1個又は2個以上のCH₂基はそれぞれ独立してO原子が相互に直接結合しないものとして-O-、-S-、-CO-により置き換えられても良く、
B¹〜B³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個以上のCH₂基は -O- 及び又は -S- に置き換えられてもよい)
(b) 1,4-フェニレン基(この基中に存在する1個のCH₂基又は隣接していない2個以上のCH₂基は -N- に置き換えられてもよい)
からなる群より選ばれる基であり、上記の基(a)、基(b)はCH₃又はハロゲンで置換されていても良く、
qは0、1又は2であり、
L¹、L²はそれぞれ独立的に単結合、-CH₂CH₂-、-(CH₂)₄-、-OCH₂-、-CH₂O-、-OCF₂-、-CF₂O-又は-C≡C-を表し、
B¹及びL¹が複数存在する場合はそれらは同一でも良く異なっていても良い。)で表される化合物群から選ばれる1種もしくは2種以上の化合物と、第三成分としてとして一般式(3)

(Wherein R ¹ and R ² are each independently an alkyl group having 1 to 15 carbon atoms or an alkenyl group having 2 to 15 carbon atoms, and this group is unsubstituted or has at least one substituent. And one or two or more CH ₂ groups present in these groups are each independently -O-, -S-, May be replaced by -CO-
B ^{1 to} B ³ are each independently
(a) trans-1,4-cyclohexylene group (one CH ₂ group present in this group or two or more non-adjacent CH ₂ groups are replaced by -O- and / or -S- (May be)
(b) 1,4-phenylene group (one CH ₂ group present in this group or two or more non-adjacent CH ₂ groups may be replaced by -N-)
A group selected from the group consisting of: the group (a), the group (b) may be substituted with CH ₃ or halogen,
q is 0, 1 or 2;
L ¹ and L ² are each independently a single bond, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —OCH ₂ —, —CH ₂ O—, —OCF ₂ —, —CF ₂ O—, or -C≡C-
When a plurality of B ¹ and L ¹ are present, they may be the same or different. ) Or one or more compounds selected from the group of compounds represented by the general formula (3) as the third component

(式中、R³はR¹と同じ意味を表し、
B⁴、B⁵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個以上のCH₂基は -O- 及び又は -S- に置き換えられてもよい)
(b) 1,4-フェニレン基(この基中に存在する1個のCH₂基又は隣接していない2個以上のCH₂基は -N- に置き換えられてもよい)
(c)ナフタレン-2,6-ジイル、デカヒドロナフタレン-2,6-ジイル及び1,2,3,4-テトラヒドロナフタレン-2,6-ジイル
からなる群より選ばれる基であり、上記の基(a)、基(b)、基(c)はCH₃又はハロゲンで置換されていても良く、
rは1又は2であり、
L³、L⁴はそれぞれ独立的に単結合、-CH₂CH₂-、-(CH₂)₄-、-OCH₂-、-CH₂O-、-OCF₂-、-CF₂O-又は-C≡C-を表し、
B⁴及びL³が複数存在する場合はそれらは同一でも良く異なっていても良く、
Q²はQ¹と同じ意味を表し、
X⁴〜X⁶はそれぞれ独立してH、F又はClである。)で表される化合物群から選ばれる化合物を1種又は2種以上を含有することが好ましい。

(Wherein R ³ represents the same meaning as R ¹ ,
B ⁴ and B ⁵ are each independently
(a) trans-1,4-cyclohexylene group (one CH ₂ group present in this group or two or more non-adjacent CH ₂ groups are replaced by -O- and / or -S- (May be)
(b) 1,4-phenylene group (one CH ₂ group present in this group or two or more non-adjacent CH ₂ groups may be replaced by -N-)
(c) a group selected from the group consisting of naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl and 1,2,3,4-tetrahydronaphthalene-2,6-diyl, (a), group (b), group (c) may be substituted with CH ₃ or halogen,
r is 1 or 2,
L ³ and L ⁴ are each independently a single bond, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —OCH ₂ —, —CH ₂ O—, —OCF ₂ —, —CF ₂ O—, or -C≡C-
When a plurality of B ⁴ and L ³ are present, they may be the same or different,
Q ² has the same meaning as Q ¹
X ^{4 to} X ⁶ are each independently H, F or Cl. It is preferable to contain one or more compounds selected from the group of compounds represented by

As for the compound represented by General formula (2), 1 type-10 types are preferable, 1 type-5 types are more preferable, 1 type-3 types are more preferable. The content of one or more compounds selected from the compound group represented by the general formula (2) is preferably in the range of 5 to 40% by mass, and in the range of 10 to 35% by mass. It is more preferable. R ¹ and R ² are preferably an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms, an unsubstituted linear alkyl group having 1 to 8 carbon atoms or an alkyl group having 2 to 8 carbon atoms. An alkenyl group is more preferable, and the structure of the following formulas (a) to (e) is more preferable as the alkenyl group.

(構造式は右端で環に連結しているものとする。)

(The structural formula shall be connected to the ring at the right end.)

B ¹ , B ² and B ³ are trans-1,4-cyclohexylene group, 1,4-phenylene group, 3-fluoro-1,4-phenylene group or 3,5-difluoro-1,4-phenylene group 1,4-phenylene group or trans-1,4-cyclohexylene group is more preferable. L ¹ and L ² are each independently a single bond, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —OCH ₂ —, —CH ₂ O—, —OCF ₂ —, —CF ₂ O— Or, —C≡C—, —CH ₂ CH ₂ —, —CH═CH— or a single bond is preferable, and —CH ₂ CH ₂ — or a single bond is more preferable. q is 0, 1 or 2, but is preferably 0 or 1.
More specifically, the following compounds are particularly preferred as the specific structure of the general formula (2).

（式中R¹、R²は炭素数1〜15のアルキル基又は炭素数2〜15のアルケニル基を表す。）

(Wherein R ¹ and R ² represent an alkyl group having 1 to 15 carbon atoms or an alkenyl group having 2 to 15 carbon atoms.)

  It is preferable to contain 2-15 types of compound groups represented by General formula (3) as a 3rd component, 2-10 types are more preferable, and 4-7 types are more preferable.

The content of one or more compounds selected from the compound group represented by the general formula (3) or the general formula (4) as the third component is more preferably in the range of 20 to 70% by mass. More preferably, it is in the range of 35 to 65% by mass. R ^{3 to} R ⁵ are preferably an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms, an unsubstituted linear alkyl group having 1 to 8 carbon atoms or an alkyl group having 2 to 8 carbon atoms. Alkenyl groups are more preferred, and structures of formulas (a) to (e) are more preferred for alkenyl groups.

B ⁴ and B ⁵ are preferably trans-1,4-cyclohexylene group, 1,4-phenylene group, 3-fluoro-1,4-phenylene group or 3,5-difluoro-1,4-phenylene group, A 1,4-phenylene group or a trans-1,4-cyclohexylene group is more preferred. L ³ and L ⁴ are a single bond, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —OCH ₂ —, —CH ₂ O—, —OCF ₂ —, —CF ₂ O—, or —C≡. C—, —CH ₂ CH ₂ —, —OCF ₂ —, —CF ₂ O— or a single bond is preferred, —CH ₂ CH ₂ —, —CF ₂ O— or a single bond is more preferred, —CH 2 ₂ CH ₂ — or a single bond is particularly preferred. r is 0, 1 or 2, with 1 or 2 being preferred.

  More specifically, the general formula (3) is preferably a compound represented by the following general formula as a specific structure.

（式中R⁴はそれぞれ独立して、炭素数1〜15のアルキル基又は炭素数2〜15のアルケニル基を表す。）

(In the formula, each R ⁴ independently represents an alkyl group having 1 to 15 carbon atoms or an alkenyl group having 2 to 15 carbon atoms.)

In the present invention, the nematic phase-isotropic liquid phase transition temperature (T _NI ) is more preferably 80 ° C. or higher, and further preferably 90 ° C. or higher. The solid phase or smectic phase-nematic phase transition temperature (T _{→ N} ) is preferably −20 ° C. or lower, and more preferably −30 ° C. or lower. The dielectric anisotropy (Δε) at 25 ° C. is preferably 4.5 to 10.0, and more preferably 5.0 to 8.0. The refractive index anisotropy (Δn) at 25 ° C. is preferably 0.05 to 0.13.

  The nematic liquid crystal composition is useful for a liquid crystal display element, particularly useful for a liquid crystal display element for driving an active matrix, and can be used for a liquid crystal display element for a reflection mode or a transflective mode.

  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”.

T _NI : Nematic phase-isotropic liquid phase transition temperature (° C) is the liquid crystal phase upper limit temperature
T _{→ N} : Solid phase or smectic phase-nematic phase transition temperature (° C) is the lower limit of liquid crystal phase temperature
And
Δε: dielectric anisotropy Δn: refractive index anisotropy
HR: Retention rate at 80 ° C (%) (Injected into TN-LCD with 6μm cell thickness, 5V applied, flame
Between the measured voltage and the initial applied voltage when measured at 200 ms and a pulse width of 64 μs.
Value expressed as a percentage. )
The following abbreviations are used in compound descriptions.
Terminal n (number) C _n H _{2n + 1-}
2 -CH ₂ CH _2-
On -OC _n H _{2n + 1}
F -F
CFFF -CF ₃
OCFFF -OCF ₃
ndm- C _n H _{2n + 1} -C = C- (CH ₂ ) _m-1-
nOm- C _n H _{2n + 1} -O- (CH ₂ ) _m-1-
-E- -COO-
-1O- -CH ₂ O-

(Examples 1 to 3) Adjustment of liquid crystal composition Nematic liquid crystal compositions (No. 1) to (No. 4) shown below were prepared and their physical properties were measured, and the results are shown in Table 1.

The nematic liquid crystal compositions (No. 1) to (No. 4) of Examples 1 to 4 have the following characteristics: nematic phase-isotropic liquid phase transition temperature (T _NI ), solid phase or smectic phase-nematic phase transition temperature ( T _{→ N} ), dielectric anisotropy (Δε), and refractive index anisotropy (Δn) showed desired values. In addition, the viscosity was low, the response speed of the panel was good, and the retention after 1 hour of heating at 150 ° C. kept the initial value, and the reliability was good.

(Comparative Examples 1 to 4) Adjustment of Liquid Crystal Composition As comparative examples, nematic liquid crystal compositions (R1) to (R4) shown below were prepared and their physical properties were measured. The results are shown in Table 2.

The nematic liquid crystal compositions (R1) to (R4) of Comparative Examples 1 to 4 have the following characteristics: nematic phase-isotropic liquid phase transition temperature (T _NI ), solid phase or smectic phase-nematic phase transition temperature (T _{→ N} ) The dielectric anisotropy (Δε) and the refractive index anisotropy (Δn) all showed desired values. However, the viscosity was higher than that of the example and the panel response speed was slow. The retention rate after 1 hour of heating at 150 ° C. maintained the initial value as in the example, and the reliability was good.

(Comparative Example 5) Adjustment of Liquid Crystal Composition As a comparative example, the nematic liquid crystal composition (R5) shown below was prepared and measured for physical properties. The results are shown in Table 3.

The nematic liquid crystal composition (R5) of Comparative Example 5 contains the first component and the third component, but does not contain the second component. For this reason, the viscosity was high as an example, and the response speed of the panel was not sufficiently high. In addition, the nematic phase-isotropic liquid phase transition temperature (T _NI ) is as low as 75.2 ° C, the smectic phase-nematic phase transition temperature (T _{→ N} ) is high, and the temperature range of the liquid crystal phase is narrow. It could not be used as. Furthermore, the retention after 1 hour of heating at 150 ° C. also decreased from the initial value, and the reliability was not sufficient.

(Comparative Example 6) Preparation of liquid crystal composition As a comparative example, the nematic liquid crystal composition (R6) shown below was prepared and measured for physical properties. The results are shown in Table 4.

The characteristics of the nematic liquid crystal composition (R6) of Comparative Example 6 are practical liquid crystal compositions because the nematic phase-isotropic liquid phase transition temperature (T _NI ) is as low as 81.4 ° C and the temperature range of the liquid crystal phase is somewhat narrow. As it was not enough. Although it contains all of the first component, the second component, and the third component, an ester compound is contained as the other component, and the retention after heating at 150 ° C. for 1 hour decreases from the initial value, It was not reliable enough.

(Comparative Example 7) Preparation of liquid crystal composition As a comparative example, the nematic liquid crystal composition (R7) shown below was prepared and measured for physical properties. The results are shown in Table 5.

The characteristics of the nematic liquid crystal composition (R7) of Comparative Example 7 are practical liquid crystal compositions because the nematic phase-isotropic liquid phase transition temperature (T _NI ) is as low as 80.0 ° C and the temperature range of the liquid crystal phase is somewhat narrow. As it was not enough.

Claims (6)

General formula (1) as the first component,

(In the formula, m is 0, 1 or 2, n is 0, 1 or 2, p is 0 or 1,
Ring A is
(a) trans-1,4-cyclohexylene group (one CH ₂ group present in this group or two or more non-adjacent CH ₂ groups are replaced by -O- and / or -S- (May be)
(b) 1,4-phenylene group (one CH ₂ group present in this group or two or more non-adjacent CH ₂ groups may be replaced by -N-)
A group selected from the group consisting of the above group (a), the group (b) may be substituted with CH ₃ or halogen,
Z ¹ is each independently -CH ₂ O-, -OCH _2- , -CF ₂ O-, -OCF _2- , -CH ₂ CH _2- , -CF ₂ CF _2- , -CH = CH- _{, - (CH 2) 4 -} , - CH = CH-CH 2 CH 2 -, - a CH ₂ CH ₂ -CH = CH- or a single bond,
Q ¹ is —OCH ₂ —, —OCF ₂ —, —OCHF—, —CF ₂ —, or a single bond,
X ^{1 to} X ³ are each independently H, F or Cl. A liquid crystal composition for an active matrix liquid crystal display device, comprising one or more compounds selected from the group of compounds represented by General formula (2) as the second component,

(Wherein R ¹ and R ² are each independently an alkyl group having 1 to 15 carbon atoms or an alkenyl group having 2 to 15 carbon atoms, and this group is unsubstituted or has at least one substituent. And one or two or more CH ₂ groups present in these groups are each independently -O-, -S-, May be replaced by -CO-
B ^{1 to} B ³ are each independently
(a) trans-1,4-cyclohexylene group (one CH ₂ group present in this group or two or more non-adjacent CH ₂ groups are replaced by -O- and / or -S- (May be)
(b) 1,4-phenylene group (one CH ₂ group present in this group or two or more non-adjacent CH ₂ groups may be replaced by -N-)
A group selected from the group consisting of: the group (a), the group (b) may be substituted with CH ₃ or halogen,
q is 0, 1 or 2;
L ¹ and L ² are each independently a single bond, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —OCH ₂ —, —CH ₂ O—, —OCF ₂ —, —CF ₂ O—, or -C≡C-
When a plurality of B ¹ and L ¹ are present, they may be the same or different. ) Or one or more compounds selected from the group of compounds represented by the general formula (3) as the third component

(Wherein R ³ represents the same meaning as R ¹ ,
B ⁴ and B ⁵ are each independently
(a) trans-1,4-cyclohexylene group (one CH ₂ group present in this group or two or more non-adjacent CH ₂ groups are replaced by -O- and / or -S- (May be)
(b) 1,4-phenylene group (one CH ₂ group present in this group or two or more non-adjacent CH ₂ groups may be replaced by -N-)
(c) a group selected from the group consisting of naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl and 1,2,3,4-tetrahydronaphthalene-2,6-diyl, (a), group (b), group (c) may be substituted with CH ₃ or halogen,
r is 1 or 2,
L ³ and L ⁴ are each independently a single bond, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —OCH ₂ —, —CH ₂ O—, —OCF ₂ —, —CF ₂ O—, or -C≡C-
When a plurality of B ⁴ and L ³ are present, they may be the same or different,
Q ² has the same meaning as Q ¹
X ^{4 to} X ⁶ are each independently H, F or Cl. 2. The nematic liquid crystal composition according to claim 1, wherein the nematic liquid crystal composition is composed of one or more compounds selected from the group of compounds represented by: Nematic-isotropic transition temperature is 85 ° C to 120 ° C, crystal or smectic-nematic transition temperature is -80 ° C to -30 ° C, refractive index anisotropy Δn is 0.05 to 0.13, anisotropic dielectric constant The liquid crystal composition according to claim 1, wherein the property Δε is 4.5 to 10.0. General formula (1) is general formula (1a)

2. The nematic liquid crystal composition according to claim 1, wherein m, n, and X ³ are as defined in general formula (1). A liquid crystal display device using the nematic liquid crystal composition according to claim 1. An active matrix liquid crystal display device using the nematic liquid crystal composition according to claim 1.