JPH0931462A - Liquid crystal composition and liquid crystal display element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a liquid crystal composition, having a low threshold voltage and a wide nematic phase, excellent in low-temperature compatibility and useful as a active matrix type liquid crystal display element, etc. by blending a specific phenyl ester with a trifluorophenyl compound. SOLUTION: This liquid crystal composition is obtained by blending (A) 3-40wt.% at least one or more phenyl ester compounds of formula I [R<1> is a 1-10C alkyl; X is OCF3 or CF3 ; Y is H or F; (n) is 0 or 1], formula II (A<1> is trans-1,4-cyclohexylene or 1,4-phenylene) and formula III (A<2> is the same kind as that of A<1> ) as the first component with (B) 60-97wt.% at least one or more hydrocarbon compounds of formulas IV, V, etc. containing 3,4,5- trifluorophenyl group as the second component. The resultant liquid crystal composition has a low threshold voltage and a wide range of nematic phase and is excellent in low-temperature compatibility and useful for an active matrix liquid crystal display element, etc.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a novel nematic liquid crystal composition, and more particularly to a liquid crystal composition for an active matrix LCD and a liquid crystal display device formed using the same.

[0002]

2. Description of the Related Art A liquid crystal display element (LCD) is obtained by enclosing a liquid crystal composition in a closed cell formed between two substrates provided with transparent electrodes. This LCD is
It consumes less power than a CRT (cathode ray tube display) and can be miniaturized and lightened. Therefore, various methods such as twisted nematic (TN) method, super twisted nematic (STN) method, and thin film transistor (TFT) method are available. It has been put to practical use below. Among them, particularly active matrix LCDs (AM-LCDs) such as thin film transistors (TFTs) have attracted attention as a favorite of flat displays in accordance with the progress of colorization and high definition.

In this liquid crystal composition for AM-LCD, 1) an appropriate refractive index anisotropy (Δn) can be taken according to the cell thickness 2) voltage holding ratio (in order to maintain high contrast of LCD ( VHR) is high 3) An appropriate threshold voltage (V _th ) can be taken according to the drive circuit 4) Nematic liquid crystal phase range is wide (wide range) depending on the operating environment There is. That is, AM-LCD
Adopts a TN display method in which the molecular orientation of the liquid crystal enclosed in the upper and lower substrates is twisted at 90 ° as the operation method. In this TN display method, coloring due to interference of the liquid crystal cell that occurs when no voltage is applied is a problem, and in order to prevent this and obtain optimum contrast, Δn and cell thickness d
The product Δn · d of (μm) is set to a certain value, for example, 0.5μ
m must be set. Because of this limitation,
The Δn of the liquid crystal composition for TFT currently in practical use is 1
st. Min. In the system, generally about 0.07 to 0.11, and especially 0.08 to 0.10. Further, as seen in recent years with the advent of small and lightweight notebook personal computers, the development of LCDs for portable use is also active. Regarding such a portable LCD, there are many restrictions in terms of driving power supply, but further reduction in weight and size as well as reduction in manufacturing cost are desired. One of the means to meet such demand is low power consumption, that is, V
_A liquid crystal material having a small _th is considered and its development is desired. Furthermore, along with the portability, the development of LCDs for outdoor use has been studied. In order for the liquid crystal composition to withstand outdoor use, it is necessary to exhibit a nematic phase even in a region exceeding the temperature range under the use environment. From this point of view, the TF currently in practical use
The mainstream liquid crystal composition for T has a nematic-isotropic phase transition temperature (clearing point: T _NI ) of 60 ° C. or higher and a lower limit of the nematic phase transition temperature ( _TL ) of −20 ° C. or lower. ing.

In order to meet such demands, various liquid crystal compounds and liquid crystal compositions containing the same have been conventionally developed. For example, Japanese Patent Application Laid-Open No. 2-233626 discloses Application Example 2 thereof, which is an example of a composition containing 15% by weight of a trifluoro compound and 85% by weight of a difluoro compound having a relatively large dielectric anisotropy (Δε). There is. However, this composition has a drawback that V _th is large, the compatibility of the contained components is deteriorated especially at low temperature, and the nematic phase range is small. Further, WO94 / 03558 discloses an example of a composition containing a trifluoro compound and a difluoro compound. However, the materials disclosed in Examples 1 and 2 have a low clearing point of 50 ° C. or lower and Δn.
Is 0.06 or less, which is not practical. As described above, liquid crystal compositions have been earnestly studied according to various purposes, but they are still insufficient, and under the present circumstances, new improvements are always required.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned drawbacks of the prior art and to satisfy various characteristics required for a liquid crystal composition for AM-LCD, and in particular, have a small V _th and a low temperature phase. It is to provide a liquid crystal composition having excellent solubility and a wide range of nematic phase.

[0006]

The present inventors have arrived at the present invention as a result of extensive studies on compositions using various liquid crystal compounds in order to achieve the above-mentioned objects. The liquid crystal composition of the present invention has the formula (1-1) to (1-3) as the first component.

[0007]

[Chemical 6]

(Wherein R ¹ is an alkyl group having 1 to 10 carbon atoms, A ¹ and A ² are independently trans-1,4-cyclohexylene or 1,4-phenylene, X is OCF ₃ or CF ₃ , Y represents H or F, and n is 0 or 1.) containing at least one compound represented by
As the second component, general formulas (2-1) to (2-7)

[Chemical 7]

(Wherein R ² represents an alkyl group having 1 to 10 carbon atoms) and at least one compound represented by the formula is contained. In the above liquid crystal composition of the present invention, the content of the first component and the second component is based on the total weight of the liquid crystal composition, the former 3 to 40% by weight and the latter 60 to 97% by weight.
It is preferred that The liquid crystal composition of the present invention further comprises a compound of the first group represented by the following formula (3):
1) and / or the compound of the second group represented by the formula (4-2) and the formula (5-1) and / or the general formula (5-
A compound selected from the compound of the third group represented by 2) can be contained.

Group 1 compounds:

[0011]

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(In the formula, R ³ represents an alkyl group having 1 to 10 carbon atoms.)

Group 2 compounds:

[0014]

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(In the formula, R ⁴ represents an alkyl group having 1 to 10 carbon atoms.)

Group 3 compounds:

[0017]

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(In the formula, R ⁵ represents an alkyl group having 1 to 10 carbon atoms.) By using these liquid crystal compositions of the present invention, a liquid crystal display device satisfying the object of the present invention can be obtained. As a preferred example of the first component used in the liquid crystal composition of the present invention,
Regarding formula (1-1), formulas (1-1-1) to (1-1-)
8) and formula (1-2), formulas (1-2-1) to (1
-2-8), and for the formula (1-3), the formula (1-3-1)
To (1-3-8) can be mentioned.

[0019]

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[0020]

[Chemical 12]

[0021]

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(In each of the above formulas, R represents 1 to 10 carbon atoms.
Is an alkyl group. ) Among these, in particular, formulas (1-1-2) and (1-1-)
7), (1-2-2), (1-2-3), (1-2
6), (1-2-8), (1-3-2) and (1-3
The compound represented by -6) is preferably used. The compound of the first component generally has Δε in the range of 10 to 35 and is also excellent in thermal stability and chemical stability.
It plays a role of reducing V _{th of the} liquid crystal composition for T.
In addition, since the compound represented by the formula (1-3) is a tetracyclic compound, it also plays a role of further increasing the clearing point of the liquid crystal composition. The content of the first component is 3 to 40% by weight, preferably 5 to 20% by weight based on the total amount of the liquid crystal composition.
It is. That is, when the content is less than 3% by weight, it is difficult to obtain the effect of low V _th among the objects of the present invention, and conversely, when the content exceeds 40% by weight, the low temperature compatibility of the liquid crystal composition deteriorates. In some cases, it is not preferable.

The compounds represented by the formulas (2-1) to (2-7) as the second component and the compounds of the first and second groups are all trifluoro compounds, which are the same as those mentioned above. As is clear from Kaihei 2-233626, .DELTA..epsilon. Is in the range of about 7 to 12, and since it is also excellent in thermal stability and chemical stability, it is well known as a compound for low voltage TFT. (R. Tarao et al., S
ID 94 Digest, p233). Among them, the compound of the second component has an upper limit of T _NI of about 50 to 10
It is in the range of 0 ° C. and is most suitable as the base compound of the composition for low voltage TFT. The content is 60 to 97% by weight, preferably 70 to 95% based on the total amount of the liquid crystal composition.
% By weight. That is, if the content is less than 60% by weight, the compatibility of the liquid crystal composition may be deteriorated especially at low temperature, and conversely, if the content exceeds 97% by weight, it is one of the objects of the present invention. This is because it becomes difficult to obtain the low voltage effect of the composition.

Among the compounds of groups 1 to 3 which can be further added to the liquid crystal composition of the present invention, the compound of the formula (3) of the first group is a bicyclic trofluoro compound. In particular, it plays a role of reducing V _{th of the} liquid crystal composition.
The content is generally 20% by weight based on the total amount of the liquid crystal composition in order to prevent the T _{NI of the} liquid crystal composition from being excessively lowered.
It is preferably 15% by weight or less.

Next, the second group of equations (4-1) and (4-
The compound represented by 2) is a tricyclic trifluoro compound, and particularly has a role of increasing T _{NI of the} liquid crystal composition. However, since it is a four-ring compound, if it is used in a large amount, the V _{th of the} liquid crystal composition may be increased or the low temperature compatibility may be deteriorated. Therefore, its content is 20% by weight or less, preferably 15% by weight or less, based on the total amount of the liquid crystal composition.

The compounds represented by the formulas (5-1) and (5-2) of the third group are 2- or 3-ring chloro (Cl) compounds, and mainly serve to lower the viscosity of the liquid crystal composition. Carry. Since Δε of these compounds is as small as 4 to 5,
When used in a large amount, V _{th of the} liquid crystal composition may be increased. Therefore, its content is 30% by weight or less, preferably 20% by weight or less, based on the total amount of the liquid crystal composition.

The composition of the present invention contains, in addition to the compounds of the first to third groups, further compounds for the purpose of the present invention, for example, improvement of V _th , low temperature compatibility, nematic phase range and the like. Can be included. The liquid crystal composition of the present invention can be prepared by a conventional method, for example, by dissolving various components with each other at a high temperature, or by dissolving each component in an organic solvent and mixing them, and then distilling off the solvent under reduced pressure. Is prepared. Further, if necessary, appropriate additives are added to improve and optimize according to the intended use. Such additives are well known to those skilled in the art and are described in detail in the literature and the like. In general, a spiral structure of liquid crystal is induced to adjust a required twist angle and reverse twist is applied.
chiral dope material (chir)
al dopant) or the like is added.

If a dichroic dye such as merocyanine-based, styryl-based, azo-based, azomethine-based, azoxy-based, quinophthalone-based, anthraquinone-based or tetrazine-based is added, a guest-host (GH) mode liquid crystal composition. Can also be used as The liquid crystal composition of the present invention,
NC manufactured by encapsulating nematic liquid crystal
It can be used as a liquid crystal composition for a polymer dispersed liquid crystal display device (PDLCD) represented by a polymer network liquid crystal display device (PNLCD) in which a three-dimensional network polymer is formed in AP or liquid crystal, and birefringence control ( It can also be used as a liquid crystal composition for ECB mode and dynamic scattering (DS) mode.

[0029]

EXAMPLES The present invention will be described in detail below with reference to examples, but the present invention is not limited to these examples. In the compositions shown in the respective Examples and Comparative Examples, the compounds are represented by the definitions shown in Table 1 below, and the left terminal group is n-, nO-, nOm-, V-, Vn-,
nVm- and nVmVk- (n, m and k are integers greater than or equal to 1) give 2, 4, E, T
Due to V, CF2O and OCF2, B, B (F), B (F, F), H, Py, D and Ch for ring structures
Thus, for the right end group, -F, -CL, -CF3,
-OCF3, -OCF2H, -n, -On, -EMe,
It is shown by -nV and -mVn (n and m are integers of 1 or more), respectively. The characteristic data of the liquid crystal composition is T
_NI (clearing point), _TL (lower limit of nematic phase transition temperature), η ₂₀ (viscosity at 20 ° C), Δn (refractive index anisotropy at 25 ° C), Δε (dielectric anisotropy at 25 ° C) , V _th (threshold voltage at 20 ° C.) and 25
It was shown by VHR (voltage holding ratio obtained based on the area method) at 0 ° C., but the _TL was 0 ° C., −10 ° C., −2.
Add the composition to each freezer at 0 ° C and -30 ° C.
The liquid crystal phase after standing for 0 days was judged.

[0030]

[Table 1]

Comparative Example 1 The following composition is disclosed in Application Example 2 of the above-mentioned JP-A-2-233626. 3-HHB (F, F) -F 15.0% 2-HHB (F) -F 28.4% 3-HHB (F) -F 28.3% 5-HHB (F) -F 28.3% The properties of this composition were determined and were as follows. T _NI = 110.7 ° C. T _L <0 ° C. η ₂₀ = 25.0 mPa · s Δn = 0.077 V _th = 2.32 (V) VHR = 98.8% As is clear from the above results, this liquid crystal It is known that the composition has a large V _{th and poor} low temperature compatibility (high T _L ).

Comparative Example 2 In Example 1 of the above-mentioned WO94 / 03558,
The following compositions are disclosed. 7-HB (F, F) -F 10.0% 2-HHB (F, F) -F 25.0% 3-HHB (F, F) -F 35.0% 5-HHB (F, F) -F 18.0% 7-HB (F) -F 12.0% The properties of this composition were determined as follows. T _NI = 42.9 ° C. T _L <0 ° C. η ₂₀ = 22.2 mPa · s Δn = 0.059 V _th = 1.07 V VHR = 98.7% As is clear from the above results, this liquid crystal composition Although V _th is small, T _NI (clearing point) is low, low-temperature compatibility is not good (T _L is high), and Δn shows a small value, which is known to be impractical.

Comparative Example 3 In Example 2 of WO94 / 03558 shown in Comparative Example 2, the following composition is disclosed. 2-HHB (F, F) -F 26.0% 3-HHB (F, F) -F 26.0% 5-HHB (F, F) -F 26.0% 7-HB (F) -F 12.0% 5-H2B (F) -F 10.0% The properties of this composition were determined as follows. T _NI = 46.0 ° C. T _L <0 ° C. η ₂₀ = 21.6 mPa · s Δn = 0.058 V _th = 1.17 V VHR = 98.5% As is clear from the above results, this liquid crystal composition Although V _th is small, T _NI (clearing point) is low, low-temperature compatibility is not good (T _L is high), and Δn shows a small value, which is known to be impractical.

Comparative Example 4 The following composition is disclosed in Example 4 of the above-mentioned WO94 / 03558. 2-HHB (F, F) -F 10.0% 3-HHB (F, F) -F 10.0% 5-HHB (F, F) -F 10.0% 5-H2B (F) -F 10.0% 5-HEB-F 7.5% 7-HEB-F 7.5% 2-HHB (F) -F 11.7% 3-HHB (F) -F 11.7% 5-HHB ( F) -F 11.6% 3-HHB-F 5.0% 5-HHEB-F 2.5% 7-HHEB-F 2.5% When the characteristic of this composition was calculated | required, it was as follows. It was T _NI = 71.3 ° C. T _L <−20 ° C. η ₂₀ = 19.2 mPa · s Δn = 0.070 V _th = 1.77 V VHR = 98.2% As apparent from the above results, this liquid crystal composition was obtained. _{Has a} high clearing point of about 70 ° C. and a large V _th , and Δn
Is known to have a slightly smaller value.

Example 1 A liquid crystal composition having the following compound contents was prepared. 3O1-BEB (F) -OCF3 5.0% 3O1-HBEB (F) -OCF3 5.0% 4O1-HBEBB (F, F) -CF3 10.0% 3-H2HB (F, F) -F 11. 0% 4-H2HB (F, F) -F 10.0% 3-HHB (F, F) -F 10.0% 3-HH2B (F, F) -F 15.0% 5-HH2B (F, F) -F 10.0% 3-HBB (F, F) -F 12.0% 5-HBB (F, F) -F 12.0% The properties of this composition were determined as follows. there were. T _NI = 76.9 ° C. T _L <−30 ° C. η ₂₀ = 41.9 mPa · s Δn = 0.097 Δε = 14.3 V _th = 1.24 V VHR = 98.7% This liquid crystal composition is The low temperature compatibility is superior to that of Comparative Examples 1 to 4. Further, the nematic phase range is large enough to have no problem in practical use (T _NI is high), and V _th also shows a small value. It is well known that it has a good balance and is highly practical. To be

Example 2 A liquid crystal composition having the following compound contents was prepared. 3O1-BEBB (F, F) -CF3 3.0% 1O1-HHEBB (F, F) -CF3 2.0% 3-H2HB (F, F) -F 5.0% 5-H2HB (F, F) -F 5.0% 3-HH2B (F, F) -F 5.0% 3-HBB (F, F) -F 27.0% 5-HBB (F, F) -F 27.0% 5- H2BB (F, F) -F 3.0% 3-HBEB (F, F) -F 5.0% 5-HBEB (F, F) -F 3.0% 3-HHEB (F, F) -F 10.0% 5-HHEB (F, F) -F 5.0% When the characteristic of this composition was calculated | required, it was as follows. T _NI = 71.6 ° C. _TL <−30 ° C. η ₂₀ = 38.2 mPa · s Δn = 0.110 Δε = 12.1 V _th = 1.24 V VHR = 98.4%

Example 3 A liquid crystal composition having the following compound contents was prepared. 1O1-HHEB (F) -OCF3 4.0% 1O1-HHEB (F, F) -CF3 2.0% 7-HB (F, F) -F 7.0% 3-H2HB (F, F) -F 12.0% 4-H2HB (F, F) -F 10.0% 5-H2HB (F, F) -F 10.0% 3-HHB (F, F) -F 10.0% 3-HH2B ( F, F) -F 12.0% 5-HH2B (F, F) -F 10.0% 3-HBB (F, F) -F 12.0% 5-HBB (F, F) -F 11. 0% The properties of this composition were determined and were as follows. T _NI = 70.4 ° C. _TL <−30 ° C. η ₂₀ = 27.1 mPa · s Δn = 0.081 Δε = 8.7 V _th = 1.51 V VHR = 98.6%

Example 4 A liquid crystal composition having the following compound contents was prepared. 4O1-HBEBB (F, F) -CF3 6.0% 3-HHB (F, F) -F 7.0% 3-H2HB (F, F) -F 9.0% 4-H2HB (F, F) -F 9.0% 3-HH2B (F, F) -F 10.0% 3-HBB (F, F) -F 28.0% 5-HBB (F, F) -F 25.0% 2- HHBB (F, F) -F 2.0% 5-HHBB (F, F) -F 4.0% The properties of this composition were determined as follows. T _NI = 82.0 ° C. _TL <−30 ° C. η ₂₀ = 37.7 mPa · s Δn = 0.112 Δε = 11.3 V _th = 1.44 V VHR = 98.5%

Example 5 A liquid crystal composition having the following compound contents was prepared. 3O1-BEB (F) -OCF3 3.0% 1O1-HHEB (F) -OCF3 5.0% 4O1-HBEBB (F, F) -CF3 5.0% 5-HB-CL 10.0% 3-HHB (F, F) -F 10.0% 3-H2HB (F, F) -F 12.0% 4-H2HB (F, F) -F 10.0% 5-H2HB (F, F) -F 10 0.0% 5-HBB (F, F) -F 28.0% 2-HHB-CL 4.0% 5-HHB-CL 3.0% The properties of this composition were determined as follows. It was T _NI = 76.5 ° C. _TL <−30 ° C. η ₂₀ = 31.6 mPa · s Δn = 0.095 Δε = 9.4 V _th = 1.55 V VHR = 98.8%

Example 6 A liquid crystal composition having the following compound contents was prepared. 1O1-HHEB (F) -OCF3 10.0% 7-HB (F, F) -F 10.0% 3-H2HB (F, F) -F 10.0% 4-H2HB (F, F) -F 10.0% 5-H2HB (F, F) -F 10.0% 3-HHB (F, F) -F 10.0% 4-HHB (F, F) -F 5.0% 3-HH2B ( F, F) -F 10.0% 3-HBB (F, F) -F 10.0% 5-HBB (F, F) -F 5.0% 3-HHBB (F, F) -F 5. 0% 3-HH2BB (F, F) -F 5.0% When the characteristic of this composition was calculated | required, it was as follows. T _NI = 77.3 ° C. T _L <−30 ° C. η ₂₀ = 30.9 mPa · s Δn = 0.086 Δε = 9.3 V _th = 1.53 V V. H. R = 98.4%

Example 7 A liquid crystal composition having the following compound contents was prepared. 3O1-BEBB (F, F) -CF3 2.0% 2O1-HBEB (F, F) -OCF3 4.0% 7-HB-CL 5.0% 7-HB (F, F) -F 5.0 % 3-HHB (F, F) -F 10.0% 4-HHB (F, F) -F 5.0% 3-H2HB (F, F) -F 10.0% 4-H2HB (F, F ) -F 10.0% 5-H2HB (F, F) -F 10.0% 3-HH2B (F, F) -F 5.0% 3-HBB (F, F) -F 14.0% 5 -HBB (F, F) -F 14.0% 3-HHBB (F, F) -F 6.0% The properties of this composition were determined as follows. T _NI = 74.7 ° C. _TL <−30 ° C. η ₂₀ = 30.0 mPa · s Δn = 0.105 Δε = 10.4 V _th = 1.53 V VHR = 98.6%

Example 8 A liquid crystal composition having the following compound contents was prepared. 3O1-HBEB (F, F) -OCF3 6.0% 3O1-HHEB (F, F) -OCF3 6.0% 7-HB (F, F) -F 6.0% 3-HBB (F, F) -F 9.0% 5-HBB (F, F) -F 9.0% 3-HHB (F, F) -F 6.0% 4-HHB (F, F) -F 5.0% 3- HH2B (F, F) -F 10.0% 5-HH2B (F, F) -F 5.0% 3-H2HB (F, F) -F 9.0% 4-H2HB (F, F) -F 8.0% 5-H2HB (F, F) -F 8.0% 3-HHEB (F, F) -F 10.0% 2-HBEB (F, F) -F 3.0% The properties were as follows. T _NI = 74.1 ° C. _TL <−30 ° C. η ₂₀ = 29.1 mPa · s Δn = 0.084 Δε = 10.4 V _th = 1.37 V VHR = 98.4%

Example 9 A liquid crystal composition having the following compound contents was prepared. 2O1-HBEB (F, F) -OCF3 9.0% 7-HB (F, F) -F 10.0% 3-HBB (F, F) -F 12.0% 3-HH2B (F, F) -F 9.0% 5-HH2B (F, F) -F 4.0% 3-H2HB (F, F) -F 10.0% 4-H2HB (F, F) -F 10.0% 5- H2HB (F, F) -F 10.0% 3-HHEB (F, F) -F 10.0% 4-HHEB (F, F) -F 3.0% 5-HHEB (F, F) -F 3.0% 2-HHBB (F, F) -F 5.0% 3-HHBB (F, F) -F 5.0% The properties of this composition were determined as follows. T _NI = 82.0 ° C. _TL <−30 ° C. η ₂₀ = 30.0 mPa · s Δn = 0.086 Δε = 10.7 V _th = 1.40 V VHR = 98.5%

[0044]

As described above, according to the present invention, the AM
It is possible to provide a liquid crystal composition having a particularly small _Vth , excellent low temperature compatibility, and a large nematic phase range while satisfying various characteristics required for a liquid crystal composition for LCD.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuhiro Haseba 3-27-2 Tatsumidai Higashi, Ichihara-shi, Chiba (72) Inventor Norihisa Hachiya 2-5 Aobadai, Ichihara-shi, Chiba (72) Inventor Nakao Etsuo Chiba 8890 Goi, Ichihara, Ibaraki Prefecture (72) Inventor Kazutoshi Miyazawa 3-27-7 Chiharadai, Ichihara, Chiba

Claims (10)

[Claims] 1. As the first component, formulas (1-1) to (1-
3) [Chemical 1] (In the formula, R ¹ is an alkyl group having 1 to 10 carbon atoms, A ¹ and A ² are independently trans-1,4-cyclohexylene or 1,4-phenylene, X is OCF ₃ or CF ₃ , and Y is H. Or F, and n is 0 or 1.) at least one compound represented by the formula (2-1) to (2-7) (In the formula, R ² represents an alkyl group having 1 to 10 carbon atoms.)
A liquid crystal composition comprising at least one compound represented by: 2. The first component and the second component are 3-40% by weight and 60-9, respectively, based on the total weight of the liquid crystal composition.
The liquid crystal composition according to claim 1, wherein the liquid crystal composition is contained in an amount of 7% by weight. (3) Formula (3) (In the formula, R ³ represents an alkyl group having 1 to 10 carbon atoms.)
The liquid crystal composition according to claim 1, further comprising a compound represented by: 4. A formula (4-1) and / or a formula (4-2): (In the formula, R ⁴ represents an alkyl group having 1 to 10 carbon atoms.)
The liquid crystal composition according to claim 1, further comprising a compound represented by: 5. The formula (5-1) and / or the general formula (5-
2) [Chemical 5] (In the formula, R ⁵ represents an alkyl group having 1 to 10 carbon atoms.)
The liquid crystal composition according to claim 1, further comprising a compound represented by: 6. A liquid crystal display device constituted by using the liquid crystal composition according to claim 1. 7. A liquid crystal display device constituted by using the liquid crystal composition according to claim 2. 8. A liquid crystal display device constituted by using the liquid crystal composition according to claim 3. 9. A liquid crystal display device constituted by using the liquid crystal composition according to claim 4. 10. A liquid crystal display device constituted by using the liquid crystal composition according to claim 5.