JPH09151373A - Nematic liquid crystal composition and liquid crystal display using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a nematic liquid crystal composition which comprises two liquid crystal components containing a plurality of compounds each having specific dielectric anisotropy respectively at a specific ratio, satisfies specific conditions, realizes the rapid response and is useful as an electrooptical display material. SOLUTION: This liquid crystal composition comprises (A) 40-80wt.% a liquid crystal component containing at least >=5 kinds of tolan compounds with a dielectric anisotropy of -2-+2 [preferably of formula I (R<11> is a 2-5C straight chain alkyl; R<14> is a 1-5C straight chain alkyl; Y<11> is H, F, CH3 )] and (B) 5-60wt.% of a liquid crystal component containing two or more compounds with a dielectric anisotropy of >=+2 [preferably a compound of formula II (R<21> is a 2-7C straight chain alkyl; Z<21> and Z<22> are each a single bond; Y<21> and Y<22> are each H, F; (k) is 0, 1)], and shows the dielectric anisotropy of >=3, an optical birefringence of >=0.15, the phase transition point from the nematic phase to the isotropic phase at >=70 deg.C, while that from the crystal phase or the smectic phase to the nematic phase at >=-10 deg.C.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nematic liquid crystal composition useful as an electro-optical display material and a liquid crystal display using the same.

[0002]

2. Description of the Related Art A typical liquid crystal display element is a TN-LCD.
(Twisted nematic liquid crystal display element)
It is used in watches, calculators, electronic organizers, pocket computers, word processors, personal computers and the like. On the other hand, the amount of information displayed on one screen is increasing with the increase in processing information of OA devices.
ffer) et al. [SID '85 Digest, p. 120 (1985)] or Kinugawa et al. [SID '86 Digest, p. 122 (1986)]
STN (Super Twisted Nematic) -LCD has been developed and is beginning to be widely used in displays for high information processing such as word processors and personal computers.

Recently, an active addressing drive system has been proposed for the purpose of improving response characteristics in STN-LCD. (Proc. 12th International Display Research Con
ference p.503 1992) As such a liquid crystal material, the elastic constant ratio K33 / K11 is around 1.5, and the dielectric anisotropy Δε
In addition to the relatively low viscosity and birefringence Δn
What is big is required. Further, as a method capable of performing color display without using a color filter layer, a novel reflection type color liquid crystal display system utilizing the birefringence of a liquid crystal and a retardation plate has been proposed. (Technical Report of the Institute of Television Engineers of Japan vol.14 No10.p.51 1990) As such a liquid crystal material, one having a larger phase difference due to the difference in the wavelength of light is preferable, and thus the birefringence Δn is particularly large. However, new liquid crystal compounds or liquid crystal compositions are still being proposed.

[0004]

[Problems to be Solved by the Invention] STN-LCD as described above
In order to improve the electro-optical characteristics of (3), a liquid crystal material having a large birefringence Δn is required. There is also a need for improved electro-optical properties, higher chemical stability of the liquid crystal material, faster response of the liquid crystal display, and wider operating temperature range. However, problems still remain. More specifically, since a smectic phase or a crystalline phase tends to appear, there is a problem in manufacturing a liquid crystal display device which is excellent in electro-optical characteristics and can be driven in a wide temperature range, and compensates for dark image quality. It is required to have excellent heat resistance against a backlight or the like added for the purpose.

The problem to be solved by the present invention is to solve or improve the above problems, and has a large birefringence Δn, a wide drivable temperature range, and a nematic liquid crystal composition excellent in responsiveness. Another object of the present invention is to provide a liquid crystal display device using the liquid crystal composition as a constituent material and having improved electro-optical characteristics.

[0006]

In order to solve the above-mentioned problems, the present invention comprises 40-80% by weight of a liquid crystal component A containing at least 5 or more tolan compounds having a dielectric anisotropy of -2 to +2. 5 to 60% by weight of the liquid crystal component B contained in the range and containing at least two kinds of compounds having a dielectric constant anisotropy of +2 or more.
A nematic liquid crystal composition having a dielectric anisotropy (Δε) of 3 or more and a birefringence (Δn) of 0.15 or more. Phase-isotropic liquid phase transition temperature (T _NI ) is 70 ° C. or higher, crystalline phase or smectic phase-nematic phase transition temperature (T → _N )
Is −10 ° C. or lower, and a nematic liquid crystal composition is provided.

The liquid crystal composition of the present invention has a dielectric anisotropy of −
The liquid crystal component A contains at least five or more liquid crystal components A in the range of 2 to +2 and at least two liquid crystal components B having a dielectric constant anisotropy of +2 or more. It is possible to enhance the optical anisotropy of the liquid crystal layer, obtain a predetermined color display, and widen the drivable temperature range, particularly in the low temperature side. Tolan compounds are
At least 5 or more kinds are required, the range of 6 to 20 kinds is preferable, and the range of 6 to 13 kinds is particularly preferable. The compound having a dielectric anisotropy of +2 or more requires at least two types, and the range of 3 to 15 types is preferable. In addition, a compound having a dielectric anisotropy of +8 to +13, a compound of +14 to +18, +
It is preferable to appropriately select and contain from 18 or more compounds, and a predetermined driving voltage and response characteristics can be obtained.
In this case, the compound having a dielectric anisotropy of +8 to +13 is 1 to
Mixing in the range of 10 kinds is preferable, and +14 to +1
The compound of 8 is preferably mixed in the range of 1 to 8 kinds, and the compounds of +18 or more are preferably mixed in the range of 1 to 10 kinds. The effect is that the liquid crystal component A is 40 to 80
By adding the liquid crystal component B in the range of 50% by weight, preferably in the range of 40 to 70% by weight, and in the range of 5 to 60% by weight, preferably in the range of 20 to 60% by weight. Become.

The crystal phase or smectic phase-nematic phase transition temperature T → _N is -10 ° C or lower, preferably -20 ° C.
The temperature is below, more preferably -30 ° C or below. The nematic phase-isotropic liquid phase transition temperature T _NI is 70 ° C. or higher, preferably 80 ° C. or higher, more preferably 90 ° C. or higher.
The liquid crystal composition of the present invention requires a dielectric anisotropy of 3 or more, preferably 5 or more, and more preferably 6 to 16 or 17 to 28. Further, the birefringence Δn needs to be 0.15 or more, and the range of 0.18 to 0.28 is particularly preferable.

The nematic liquid crystal composition of the present invention can be used in an active matrix type, twisted nematic or super twisted nematic liquid crystal display device, and the present invention also provides such a liquid crystal display device. It is a thing.

Further, the liquid crystal composition is characterized in that the molecules of the liquid crystal composition of the present invention have a twisted orientation in the range of 30 ° to 360 ° between two substrates having at least one transparent electrode layer having a transparent electrode layer. A display device is also provided. The twist orientation can be selected in the range of 30 ° to 360 ° depending on the purpose, preferably in the range of 90 ° to 270 °, and in the range of 45 ° to 135 ° or 180 ° to 260.
It is particularly preferable to select in the range of °. In this case, the pretilt angle obtained by the alignment film provided on the transparent electrode substrate is preferably selected in the range of 1 ° to 20 °, and the pretilt angle of 1 ° to 4 ° when the twist angle is 30 ° to 100 °. Is preferred, 2 ° to 100 ° to 180 °
A pretilt angle of 6 ° is preferable, and a pretilt angle of 3 ° to 12 ° is preferable for 180 ° to 260 ° and 260 ° to
At 360 °, a pretilt angle of 6 ° -20 ° is preferred.

Further, the nematic liquid crystal composition of the present invention is
It is useful for high-speed response TN-LCD and STN-LCD, and is useful for a liquid crystal display element that can display a color by the birefringence of the liquid crystal layer and the retardation plate without using a color filter layer. Therefore, it can be used for a transmissive or reflective liquid crystal display element. The present invention also provides such a liquid crystal display device.

Further, in the above liquid crystal display device, in order to obtain the characteristics of high speed response and low driving voltage, the liquid crystal layer of the liquid crystal composition of the present invention can be used with the thickness of 1 to 5 μm. The present invention also provides such a liquid crystal display device.

The preferred liquid crystal compounds having a dielectric anisotropy larger than 2 described in the present invention are shown below. That is, the chemical structure of the liquid crystal compound is rod-shaped, and the central part has a core structure having 1 to 4 six-membered rings, and the six-membered rings located at both ends in the central part major axis direction are liquid crystal molecules. It has a terminal group substituted at a position corresponding to the long axis direction, and at least one of the terminal groups present at both ends is a polar group, that is, for example, -CN, -OCN, -NC.
_{S, -F, -Cl, -NO 2} , -CF 3, -OCF 3, -OCH
Is a compound which is F _2.

In the present invention, as a compound suitable for obtaining the above liquid crystal composition, as the liquid crystal component A, (1) the general formulas (I-1) to (I-3)

[0015]

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(In the formula, R ^{11 to} R ¹³ each independently represent a linear alkyl group or alkenyl group having 2 to 5 carbon atoms, and R ^{14 to} R ¹⁶ each independently represent 1 to 1 carbon atoms.
5 linear alkyl group, an alkoxy group, an alkenyl group or a _{C q H 2q + 1 -O-} C r H 2r, q and r are each independently an integer of 1 to 5, Y ¹¹ to Y ¹³ each independently represents a hydrogen atom, a fluorine atom or —CH ₃ ,
^{14 to} Y ¹⁶ each independently represent a hydrogen atom or a fluorine atom, Z ¹¹ represents —COO—, —C ₂ H ₄ — or a single bond, and the hydrogen atom (H) of the cyclohexane ring in each compound is deuterium. It may be substituted with an atom (D). )
It is preferable to contain a compound selected from the first group consisting of the compounds represented by the following formula (2) as the liquid crystal component B:
General formulas (II-1) to (II-3)

[0017]

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(In the formula, R ^{21 to} R ²³ each independently represent a linear alkyl group having 2 to 7 carbon atoms, an alkenyl group or C _s H _{2s + 1} -O-C _t H _2t , and s And t each independently represent an integer of 1 to 5, and X ^{21 to} X ²³ each independently represent a fluorine atom, a chlorine atom, —OCF ₃ , —OCHF ₂ ,
-CF ₃ or represents -CN, Y ²¹ ~Y ²⁸ represents each independently H or F, Z ²¹ ~Z ²³ are each independently a single _{bond, -COO -, - C 2 H} 4 -, - C≡C − or —C ₄ H ₈ —, Z ²⁴ and Z ²⁵ are each independently a single bond, —CO
O- or -C≡C- is represented, k and l are each independently an integer of 0 or 1, and the hydrogen atom (H) of the cyclohexane ring in each compound is substituted with a deuterium atom (D). Is also good. ) It is preferable to contain a compound selected from the second group consisting of the compounds represented by

The compounds represented by the general formulas (I-1) to (I-3) according to the present invention are more specifically represented by the general formulas (I-4) to (I-4).
(I-11)

[0020]

[Chemical 6]

(Wherein R ^{11 to} R ¹⁶ have the same meanings as described above), and it is more preferable to use a compound selected from these. The dielectric anisotropy of these compounds is in the range of -2 to +2.
In Table 1 below, the representative compound examples (No. 1-1 to 1)
-6) shows the phase transition temperature.

In the table below, mp is the temperature at which the crystal phase changes to the liquid crystal phase or the isotropic liquid phase, and cp is the temperature at which the liquid crystal phase changes to the isotropic liquid phase. Respectively,
All represent "° C". Further, each compound used was sufficiently purified after removing impurities by a method such as distillation, column purification, and recrystallization.

[0023]

[Table 1]

The liquid crystal composition of the present invention contains, as the liquid crystal component A, a compound selected from the first group consisting of the compounds represented by the general formulas (I-1) to (I-3) (1). ,
The birefringence Δn is large, the viscosity is small, and the specific resistance and the voltage holding ratio are high. In particular, the general formula (I-4)
The compounds (I-8) are excellent in this effect. Specifically, a compound in which R ¹¹ is an alkyl group and R ¹⁴ is an alkyl group or an alkoxy group having 1 to 5 carbon atoms is preferable. Also, R
¹² is an alkyl group or an alkenyl group and R ¹⁵ has 1 carbon atom
Compounds of alkyl groups or alkoxy groups of ~ 5 are preferred. The compound having a large birefringence Δn and a small viscosity is a compound in which an alkenyl group is CH ₂ = CH _2- (CH ₂ ) _u (u = 0, 2) and a compound in which the linking group Z ¹¹ is a single bond, These are particularly preferred. The same applies to the liquid crystal components B and C.

Further, a larger pretilt angle is formed by containing a compound in which R ¹⁴ and R ¹⁵ of the compounds represented by the general formulas (I-4) to (I-8) have an alkoxyalkyl group. A liquid crystal display device capable of being provided can be provided. The nematic liquid crystal composition of the present invention having an improved pretilt angle as described above can remarkably suppress the occurrence of reverse tilt due to heat dissipation of the backlight or the occurrence of stripe domains in STN-LCD, and thus display quality and production yield can be improved. Can be improved.

The liquid crystal composition of the present invention is characterized by containing at least five tolan compounds as the liquid crystal component A. This is because compatibility problems occur when the number of tolan compounds is 4 or less. For example, the crystal phase or smectic phase-nematic phase transition temperature T → _N is-
Even if the temperature is as low as 25 ° C. or lower, precipitation is likely to occur at low temperature storage at −25 ° C., making it difficult to form a stable nematic phase. The present invention is particularly useful for such problems.

(2) General formula (II-1) to
Specific examples of the compound selected from the second group consisting of the compound represented by (II-3) include general formulas (II-4) to
(II-21)

[0028]

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[0029]

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(In the formula, R ^{21 to} R ²³ , Y ^{21 to} Y ²⁸ , and X ²¹ to
X ²³ has the same meaning as described above. ), The dielectric anisotropy of which is +2 or more. Table 2 shows typical examples of the compounds (No. 2-1 to 2-1).
6) and shows its phase transition temperature.

In the table below, mp is the temperature at which the crystal phase changes to the liquid crystal phase or the isotropic liquid phase, and cp is the temperature at which the liquid crystal phase changes to the isotropic liquid phase. Respectively,
All represent "° C". Further, each compound used was sufficiently purified after removing impurities by a method such as distillation, column purification, and recrystallization.

[0032]

[Table 2]

[0033]

[Table 3]

The liquid crystal composition of the present invention comprises (2) the general formula (II
By containing a compound selected from the second group consisting of the compounds (1) to (II-3), the driving voltage can be reduced, the viscosity is relatively small, and the specific resistance and the voltage holding ratio are relatively small. It has the characteristic of being expensive. In particular, general formulas (II-4) to (II
-10) and the compounds of general formulas (II-12) to (II-16) are excellent in this effect. In addition, the general formula (II-13), (II-15),
The compounds of (II-17) to (II-21) are excellent in that this effect can be obtained by adding a small amount of 0.5 to 30%.

More specifically, R ²¹ has from 2 to 2 carbon atoms.
5 alkyl groups or alkenyl groups are preferable, and it is particularly preferable that at least one compound having an alkenyl group is contained. R ²² is preferably a compound of an alkyl group, alkenyl group or alkoxy group having 2 to 5 carbon atoms.

In the nematic liquid crystal composition, the present invention further comprises (3) the general formulas (III-1) to (I) as the liquid crystal component C which can be added in addition to the liquid crystal component A and the liquid crystal component B.
II-3)

[0037]

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(In the formula, R ^{31 to} R ³³ each independently represent a linear alkyl group or alkenyl group having 2 to 7 carbon atoms, and R ^{34 to} R ³⁶ each independently represent 1 to 1 carbon atoms.
7 represents a linear alkyl group, an alkoxy group, an alkenyl group or an alkenyloxy group, wherein Z ^{31 to} Z ³⁴ are each independently a single bond, —COO—, —C ₂ H ₄ — or —C ₄ H ₈ —. Z ³⁵ represents a single bond or —COO—, ring A represents a cyclohexane ring or a cyclohexene ring, and m, n and p each independently represent an integer of 0 or 1. ) And a compound selected from the third group consisting of compounds represented by

The liquid crystal composition of the present invention contains, as the liquid crystal component C, a compound selected from the third group consisting of the compounds of (3) general formulas (III-1) to (III-3), and And has a relatively high specific resistance and voltage holding ratio. In particular, the following general formula (III-4)
(III-15)

[0040]

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A compound represented by the formula (wherein R ^{31 to} R ³⁶ have the same meanings as described above) is preferable, and R ^{31 is}
A preferable effect can be obtained by incorporating at least one compound in which R ³³ is an alkenyl group. The compounds of the general formulas (III-4) to (III-11) and the general formula (III-13) can obtain this effect by adding a small amount of 3 to 30%.

The liquid crystal composition of the present invention has the above general formula (I-
In addition to the compounds represented by 1) to (III-3), in order to improve the characteristics of the liquid crystal composition, a normal nematic liquid crystal, a smectic liquid crystal, a cholesteric liquid crystal or the like which is recognized as a liquid crystal compound may be contained. Good. However,
Since the characteristics of the nematic liquid crystal composition are reduced by using a large amount of these compounds, the addition amount is limited according to the required characteristics of the obtained nematic liquid crystal composition.

[0043]

EXAMPLES The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. Moreover, "%" in the composition of the following examples means "weight%."

The chemical stability of the composition is 2 g of the liquid crystal composition.
Was placed in an ampoule tube, vacuum-degassed, and then subjected to a process of purging with nitrogen and sealed. A heating promotion test at 150 ° C. for 1 hour was performed to measure a voltage holding ratio of the liquid crystal composition. The characteristics measured in the examples are as follows.

T _NI : Nematic phase-isotropic liquid phase transition temperature (° C.) T → _N : Solid phase or smectic phase-nematic phase transition temperature (° C.) V _th : When a TN-LCD having a cell thickness of 6 μm is constructed Threshold voltage (V) γ: Ratio of saturation voltage (V _sat ) to V _th Δε: Dielectric anisotropy Δn: Birefringence η: Viscosity at 20 ° C. (cp)

(Example 1)

[0047]

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A nematic liquid crystal composition No. 3-
No. 1 was prepared and the properties of this composition were measured. The results were as follows. T _NI : 92.0 ° C. T → _N : −40. ° C _Vth : 2.28 Vγ: 1.12 Δε: 6.0 Δn: 0.220 η: 17.8 c. p.

This nematic liquid crystal composition has a low threshold voltage and steepness is also described in the document "High-speed liquid crystal technology" (Page 63,
The value is the same as 1.12 which is the limit value of the optical steepness of the liquid crystal display shown in CMC Co., Ltd.). Therefore, this No. It can be understood that the liquid crystal composition of 3-1 is useful for high time division driving.

Furthermore, a TN-LCD having a cell thickness d of 2.3 μm
The display characteristics of the liquid crystal display device were measured, and a liquid crystal display device having a threshold voltage of 1.89 V and a response speed of 0.8 msec was obtained.

(Example 2)

[0052]

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A nematic liquid crystal composition No. 3-
2 was prepared, and various properties of the composition were measured. The results were as follows. T _NI : 80.1 ° C. T → _N : −60. ° C V _th : 1.31 V Δε: 13.4 Δn: 0.200

When the display characteristics of a TN-LCD having a cell thickness d of 2.5 μm were measured, a liquid crystal display device having a threshold voltage of 1.10 V and a response speed of 0.6 msec was obtained. Was given.

A chiral substance "S-811" (manufactured by Merck) was added to this nematic liquid crystal composition to prepare a mixed liquid crystal. On the other hand, "San Ever
An alignment film was formed by rubbing an organic film of "610" (manufactured by Nissan Chemical Industries, Ltd.) to produce an STN-LCD display cell having a twist angle of 220 degrees. The mixed liquid crystal was injected into this cell to construct a liquid crystal display, and the display characteristics were measured. As a result, a liquid crystal display device exhibiting STN-LCD display characteristics with a low threshold voltage, excellent high time division characteristics, and improved fast response was obtained.

The chiral substance is added so that the inherent helical pitch P of the mixed liquid crystal and the cell thickness d of the display cell due to the addition of the chiral substance are Δn · d = 0.85 and d / P = 0.53. did.

(Example 3)

[0058]

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A nematic liquid crystal composition No. 3-
No. 3 was prepared, and various properties of this composition were measured. The results were as follows. T _NI : 88.0 ° C. T → _N : −50. C. V _th : 2.27 V Δε: 5.0 Δn: 0.200 η: 16.5 c. p. Voltage holding ratio before test: 99.5% Voltage holding ratio after heating acceleration test: 98.0%

Since the nematic liquid crystal composition has a high voltage holding ratio after the heat acceleration test, it can be understood that it is stable to heat. Further, when an active matrix liquid crystal display device using this composition as a constituent material was produced, it was confirmed that the device was excellent in that the leakage current was small and flicker did not occur.

(Example 4)

[0062]

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A nematic liquid crystal composition No. 3-
No. 4 was prepared, and various properties of this composition were measured. The results were as follows. T _NI : 98.1 ° C. T → _N : −35. ° C _Vth : 1.99 Vγ: 1.12 Δε: 7.9 Δn: 0.230 η: 23.0 c. p. Voltage holding ratio before test: 99.4% Voltage holding ratio after heating acceleration test: 98.1%

Since the nematic liquid crystal composition has a high voltage holding ratio after the heat acceleration test, it can be understood that it is stable to heat. Further, when an active matrix liquid crystal display device using this composition as a constituent material was produced, it was confirmed that the device was excellent in that the leakage current was small and flicker did not occur.

This nematic liquid crystal composition has a low threshold voltage and steepness is also described in the document "High-speed liquid crystal technology" (Page 63,
The value is the same as 1.12 which is the limit value of the optical steepness of the liquid crystal display shown in CMC Co., Ltd.). Therefore, it can be understood that it is useful for high time division driving.

(Example 5)

[0067]

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A nematic liquid crystal composition No. 3-
5 was prepared and the properties of this composition were measured. The results were as follows. T _NI : 90.3 ° C. T → _N : −40. C. V _th : 2.40 V Δε: 3.9 Δn: 0.222 η: 14.9 c. p. Voltage holding ratio before test: 99.6% Voltage holding ratio after heating acceleration test: 98.4%

Since this nematic liquid crystal composition has a high voltage holding ratio after the heating acceleration test, it can be understood that it is stable to heat. Further, when an active matrix liquid crystal display device using this composition as a constituent material was produced, it was confirmed that the device was excellent in that the leakage current was small and flicker did not occur.

Further, when TN-LCD having a cell thickness d of 2.2 μm was constructed and its display characteristics were measured, a liquid crystal display device having a threshold voltage of 2.01 V and a response speed of 0.5 msec was obtained. Was given.

Example 6 No. When the wavelength dispersion of the birefringence of the nematic liquid crystal compositions 3-1 to 3-5 was measured, the ratio of light at 400 nm to 650 nm was 1.15 or more. Because this liquid crystal material shows a larger phase difference due to the difference in the wavelength of light, a new reflective color that uses the birefringence of the liquid crystal and the phase difference plate to perform color display without using a color filter layer This is useful for a liquid crystal display system.

[0072]

The nematic liquid crystal composition of the present invention has a large birefringence Δn, exhibits a nematic phase over a wide temperature range, and has a high voltage holding ratio and high chemical stability. Therefore, the nematic liquid crystal composition of the present invention can be used for an active matrix type, twisted nematic or super twisted nematic liquid crystal display device. In addition, it is possible to provide a liquid crystal display element that performs color display due to the birefringence of the liquid crystal layer and the retardation plate. In particular, a large birefringence can reduce the thickness d of the liquid crystal layer, improve response characteristics, and provide display characteristics with a large amount of information.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location G02F 1/13 500 G02F 1/13 500

Claims (9)

[Claims] 1. A liquid crystal component A containing at least 5 or more tol-type compounds having a dielectric anisotropy of −2 to +2 and 40 to 80.
A liquid crystal composition containing 5% to 60% by weight of a liquid crystal component B containing at least two compounds having a dielectric constant anisotropy of +2 or more in the range of 5% by weight. The product has a dielectric anisotropy (Δε) of 3 or more, a birefringence (Δn) of 0.15 or more, and a nematic phase-isotropic liquid phase transition temperature (T _NI ) of 70 ° C. or more. And the crystal phase or smectic phase-nematic phase transition temperature (T → _N )
Is −10 ° C. or lower, a nematic liquid crystal composition. 2. As the liquid crystal component A, (1) the general formula (I-
1) ~ (I-3) [Chemical formula 1] (In the formula, each of R ^{11 to} R ¹³ independently has 2 to 2 carbon atoms.
5 represents a linear alkyl group or an alkenyl group represented by R ^14,
To R ¹⁶ are each independently a linear alkyl group having 1 to 5 carbon atoms, an alkoxy group, an alkenyl group or C _q H _{2q + 1-.
Represents} O—C _r H _2r , and q and r each independently represent 1 to
5 represents an integer, Y ¹¹ to Y ¹³ are each independently a hydrogen atom, a fluorine atom or -CH _3, Y ¹⁴ ~Y ¹⁶ each independently represent a hydrogen atom or a fluorine atom, Z ¹¹
Represents —COO—, —C ₂ H ₄ — or a single bond, and the hydrogen atom (H) of the cyclohexane ring in each compound may be replaced with a deuterium atom (D). The nematic liquid crystal composition according to claim 1, further comprising a compound selected from the first group consisting of compounds represented by the formula (1). 3. As the liquid crystal component B, (2) the general formula (II-
1) ~ (II-3) [Chemical formula 2] (In the formula, R ^{21 to} R ²³ each independently have 2 to 2 carbon atoms.
7 linear alkyl group, alkenyl group or C _s H _{2s + 1} -O
-C _t H _2t , s and t are each independently 1 to 5
Of an integer, X ²¹ to X ²³ each independently fluorine atom, a chlorine _{atom, -OCF 3, -OCHF 2, -CF} 3 or -
Represents CN, and Y ^{21 to} Y ²⁸ each independently represent H or F.
And Z ^{21 to} Z ²³ each independently represent a single bond, -C
_{OO -, - C 2 H 4} -, - C≡C- or -C ₄ H ₈ - represents, Z
²⁴ and Z ²⁵ are each independently a single bond, —COO— or —C.
Represents ≡C-, and k and l are each independently 0 or 1.
The hydrogen atom (H) of the cyclohexane ring in each compound may be replaced with a deuterium atom (D). The nematic liquid crystal composition according to claim 1 or 2, further comprising a compound selected from the second group consisting of the compounds represented by the formula (1). 4. In addition to the liquid crystal component A and the liquid crystal component B, a liquid crystal component C that can be added includes (3) the general formula (III-
1) to (III-3) (In the formula, R ^{31 to} R ³³ each independently have 2 to 2 carbon atoms.
7 represents a linear alkyl group or an alkenyl group represented by R ³⁴
To R ³⁶ each independently represent a linear alkyl group having 1 to 7 carbon atoms, an alkoxy group, an alkenyl group or an alkenyloxy group, and Z ^{31 to} Z ³⁴ each independently represent a single bond, —COO—, Represents —C ₂ H ₄ — or —C ₄ H ₈ —, Z ³⁵ represents a single bond or —COO—, ring A represents a cyclohexane ring or a cyclohexene ring, and m, n and p are each independently 0. Or represents an integer of 1. 4. The nematic liquid crystal composition according to claim 1, containing a compound selected from the third group consisting of the compounds represented by the formula (1). 5. The nematic liquid crystal composition according to claim 1, 2, 3 or 4 is twisted and aligned in the range of 30 ° to 360 ° between two substrates having a transparent electrode layer and at least one of which is transparent. A liquid crystal display device comprising: 6. An active matrix type liquid crystal display device using the nematic liquid crystal composition according to claim 1. 7. A twisted nematic or super twisted nematic liquid crystal display device using the nematic liquid crystal composition according to claim 1. Description: 8. The liquid crystal display device according to claim 5, 6 or 7, wherein the liquid crystal layer and the retardation plate do not have a color filter layer for color display. 9. The liquid crystal display device according to claim 5, wherein the thickness of the liquid crystal layer is 1 to 5 μm.