JPH10287875A - Liquid crystal composition and liquid crystal display element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a liquid crystal composition capable of exhibiting small refractive index anisotropy and negative dielectric anisotropy and useful as an active matrix liquid crystal display element, etc., having broad angle of visibility by including specific plural kinds of fluorine-containing compound component. SOLUTION: This liquid crystal composition contains (A) a component comprising a compound of formula I [R<1> and R<2> are each a 1-10C alkyl; (p) is 1-5], (B) a component comprising a compound of formula II [(q) is (p)] or a compound of formula III [R<3> and R<4> are each R<1> ; Y is H or F; (r) is (p)] and as necessary, further, (C) a compound, etc., of formula IV (R<5> and R<6> are each R<1> , wherein methylene which is not mutually adjacent may be replaced with 0), a compound, etc., of formula V. For example, the components A, O and C are each contained in an amount of 3-25 wt.%, 3-70 wt.% and 0-90 wt.% based on total weight of the composition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a nematic liquid crystal composition having a negative dielectric anisotropy and a liquid crystal display device using the liquid crystal composition. More specifically, the present invention relates to a liquid crystal composition having a negative dielectric anisotropy for an active matrix liquid crystal display device and a liquid crystal display device using the composition.

[0002]

2. Description of the Related Art A liquid crystal display (LCD) has a lower power consumption, a smaller size, and a lighter weight than a CRT (CRT), and thus has a twisted nematic (TN) type and a super twisted nematic (STN) type. Various LCDs such as a thin film transistor (TFT) method have been put to practical use. Among them, active matrix LCDs (AM-LCDs) of the (TFT) type and the like have been attracting attention as the favorite of flat displays as colorization and definition have progressed.
The characteristics required of the liquid crystal composition for AM-LCD include: 1) a high voltage holding ratio (VHR) in order to maintain a high contrast of the LCD. 2) The nematic liquid crystal phase range is large depending on the use environment. 3) An appropriate refractive index anisotropy (Δn) can be obtained depending on the cell thickness. 4) An appropriate threshold voltage can be obtained according to the drive circuit. Can be mentioned. As the operation method of the AM-LCD, the TN display method in which the orientation of liquid crystal molecules between the upper and lower electrode substrates is twisted by 90 ° is the mainstream, but there is a drawback that it is difficult to apply to a large screen due to a narrow viewing angle. Was.
Therefore, as a mode for improving the viewing angle, a) an IPS display system (R. Kiefer, B. Weber) in which a liquid crystal phase shows a homogeneous alignment state when no voltage is applied and liquid crystal molecules rotate 45 to 90 ° in a plane when a voltage is applied. , F. Windscheid
And G. Baur's "In-Plane Switching of Nematic"
Liquid Crystals ", JAPAN DISPLAY '92, p. 547) and b) a display system in which the liquid crystal phase shows a homeotropic alignment state when no voltage is applied, and changes to a horizontal unidirectional alignment state when a voltage is applied (Japanese Unexamined Patent Publication No. These display systems are characterized by high response speed and high contrast in addition to realizing a wide viewing angle, and a liquid crystal composition having a negative dielectric anisotropy (Δε). It has the major feature of being able to apply objects, and these modes of operation are birefringent modes (Electrically Controlled
Since birefringence mode is used, in order to obtain an optimum contrast, the product Δnd of the refractive index anisotropy (Δn) and the cell thickness (d) is set to a certain value (for example, Δnd =
(Approximately half the value of the TN display method such as 0.275 μm). Therefore, a practical cell thickness of 3 to 6
μm, the value of Δn is 0.05 to
A small value of about 0.10, especially about 0.06 to 0.09 is required. Since the response time (hereinafter sometimes abbreviated as τ) is proportional to the viscosity of the liquid crystal composition (hereinafter sometimes abbreviated as η), a liquid crystal composition having a small η is required. With this background, Japanese Patent Application Laid-Open No. 6-228037 discloses a novel compound having a negative Δε and an example of a composition using the compound. However, the disclosed compositions have the disadvantage that the value of Δε is positive and the value of Δn is too large. In addition, a compound having a cyano group is included, and the voltage holding ratio (VHR) becomes small, so that it cannot be applied to AM-LCD. As described above, although the liquid crystal composition has been intensively studied for various purposes, it is presently demanding a new improvement.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide the liquid crystal composition for AM-LCD with the above-mentioned a) and b) which can realize a wide viewing angle while satisfying various characteristics. An object of the present invention is to provide a liquid crystal composition having a relatively small value of Δn and having a negative dielectric anisotropy, which can be applied to a display system.

[0004]

Means for Solving the Problems The present inventors have intensively studied compositions using various liquid crystal compounds in order to solve these problems. As a result, the compound represented by the general formula (I) and the compound represented by the general formula (I) It has been found that the intended purpose can be achieved by a liquid crystal composition containing the compound represented by (II-1) or (II-2). Hereinafter, the present invention will be described in detail. A first aspect of the present invention comprises, as a first component, at least one compound selected from the group of compounds represented by the general formula (I), and as a second component, a general formula (II-1) or ( II−
A liquid crystal composition comprising at least one compound selected from the compound group represented by 2).

[0005]

Embedded image

(Wherein R ¹ , R ² , R ³ and R ⁴ each independently represent an alkyl group having 1 to 10 carbon atoms, and Y is H
Or F, and p, q and r are each independently 1
Represents an integer of from 1 to 5, and each atom constituting these compounds may be substituted with its isotope. A second aspect of the present invention is directed to the first aspect, wherein the first component is 3 to 25% by weight and the second component is 3 to 70% by weight based on the total weight of the liquid crystal composition. It is a liquid crystal composition of the description. A third aspect of the present invention is to provide, as a first component, a compound represented by the general formula (I):
At least one compound selected from the compound group represented by the general formula (II-1) or (II-2) as the second component. Wherein the compound further comprises at least one compound selected from the group of compounds represented by formulas (III-1) to (III-6) as a third component. 3. The liquid crystal composition according to any one of 1. to 2.

[0007]

Embedded image

(Wherein R ⁵ and R ⁶ each independently represent an alkyl group having 1 to 10 carbon atoms, provided that any non-adjacent methylene group (CH 2) in the alkyl group is an oxygen atom (O) And Y represents H or F, and each atom constituting these compounds may be substituted with its isotope.) A fourth aspect of the present invention is that the total weight of the liquid crystal composition is On the other hand, the first component is 3 to 25% by weight, the second component is 3 to 70% by weight,
The third component, wherein the component is 90% by weight or less.
The invention relates to a liquid crystal composition according to the invention. A fifth aspect of the present invention is
The present invention relates to a liquid crystal display device using the liquid crystal composition according to any one of the first to fourth inventions.

Hereinafter, the compounds constituting the liquid crystal composition of the present invention will be described. The compound represented by the general formula (I) has a dielectric anisotropy (Δε) in a range of approximately −4 to −1 and a clearing point (Tc) of approximately 60 to 80 ° C.
And has excellent thermal stability and chemical stability, and thus plays a role in reducing the threshold voltage and the viscosity of the liquid crystal composition for TFT, which is particularly required to have high reliability. However, the refractive index anisotropy (△ n) is approximately 0.05
Since the composition is adjusted to 0.07 to 0.07, Δn of the composition is slightly reduced, which is not preferable. On the other hand, general formulas (II-1) and (II-2)
Have a dielectric anisotropy (Δε) in the range of about −6 to −1, a clearing point (Tc) in the range of about 70 to 140 ° C., and have thermal stability and chemical stability. Since it has excellent thermal stability, it plays a role in further reducing the threshold voltage of the liquid crystal composition. However, since the refractive index anisotropy (Δn) is approximately in the range of 0.08 to 0.18, if the composition is adjusted only with these compounds,
Δn of the composition is undesirably increased slightly. By appropriately combining several kinds of compounds represented by the general formula (I) and several kinds of compounds represented by the general formulas (II-1) and (II-2), the object of the present invention, particularly, a cell A liquid crystal composition for AM-LCD having a suitable value of Δn according to the thickness and having a negative dielectric anisotropy can be adjusted.

In the liquid crystal composition of the present invention, the content of the first component is preferably 3 to 25% by weight. More preferably, it is 5 to 20% by weight. If the content of the first component is less than 3% by weight, Δn of the liquid crystal composition may be undesirably increased, and if it exceeds 25% by weight, the clearing point of the liquid crystal composition becomes too low. Not preferred.
In the liquid crystal composition of the present invention, the content of the second component is 3
~ 60% by weight is preferred. More preferably, it is 5 to 60% by weight. If the content of the second component is less than 3% by weight, Δn of the liquid crystal composition may be undesirably small. On the other hand, if it exceeds 40% by weight, the compatibility of the liquid crystal composition at low temperatures may deteriorate, and Δn of the liquid crystal composition may increase, which is not preferable. The compounds represented by formulas (III-1) and (III-2) play a role in lowering the viscosity of the liquid crystal composition. However, when used in a large amount, the threshold voltage of the liquid crystal composition may be increased, and the clearing point may be too low. The compounds represented by the general formulas (III-3) to (III-6) play a role particularly to increase the clearing point. However, when used in a large amount, the compatibility of the liquid crystal composition at low temperatures may deteriorate. In the liquid crystal composition of the present invention, the content of the third component is preferably from 24 to 97% by weight. More preferably 30 to
90% by weight. If the content of the third component is less than 24% by weight, the compatibility of the liquid crystal composition at low temperatures may deteriorate, which is not preferable. On the other hand, when the content exceeds 97% by weight, the threshold voltage of the liquid crystal composition is increased, and Δn may be undesirably reduced.

The liquid crystal composition of the present invention is prepared by a conventional method. Generally, a method of dissolving various components at a high temperature is used. Further, a dichroic dye such as a merocyanine-based, styryl-based, azo-based, azomethine-based, azoxy-based, quinophthalone-based, anthraquinone-based, and tetrazine-based dye is added to the liquid crystal composition of the present invention.
It can also be used as a liquid crystal composition for a guest host (GH) mode. Alternatively, NCAP prepared by microencapsulating a nematic liquid crystal or a polymer network liquid crystal display device (PN) prepared by forming a three-dimensional network polymer in a liquid crystal.
Polymer-dispersed liquid crystal display device (P
It can also be used as a liquid crystal composition for DLCD). Further, it can be used as a liquid crystal composition to which a chiral compound is added. In addition, it can be used as a liquid crystal composition for a birefringence control (ECB) mode or a dynamic scattering (DS) mode.

[0012]

EXAMPLES The present invention will be described in detail below with reference to examples, but the present invention is not limited to these examples. The composition ratios of Comparative Examples and Examples are all shown in% by weight, and the compounds are represented by symbols based on the definitions shown in Table 1.

[0013]

[Table 1]

The characteristic data of the liquid crystal composition include a clearing point (T _NI ), a lower limit of the nematic phase transition temperature (T _SN ),
Viscosity at 0 ° C. (η ₂₀ ), refractive index anisotropy at 25 ° C. (Δn), threshold voltage at 20 ° C. (Vth),
It was represented by a voltage holding ratio (VHR) at 25 ° C. In addition,
Voltage holding ratio (VHR) is measured have not a group in the method (area method) described in JP-A-5-331464, the lower limit value of nematic phase transition temperature (T _SN) is, 0 ° C., -10
C., -20.degree. C., -30.degree. C., and -40.degree.

Comparative Example 1 The following composition (composition A) disclosed in Example 26 of JP-A-6-228037 was prepared. 3-HBB (2F, 3F) -1O1 10.0% ZLI-1132 90.0% T _NI = 75 (° C.) T _SN <−20 ° C. η ₂₀ = 29.0 (mPa · s) Δn = 0.139 Vth = 1.79 (V) VHR = 71.3% This liquid crystal composition has a low voltage holding ratio and is not suitable for AM-LCD. Comparative Example 2 The following composition (composition B) disclosed in Example A of JP-A-2-4724 was prepared. 5-HB-F 15.0% 7-HB-F 15.0% 3-HB-O1 10.0% 3-HH2B-F 5.0% 5-HH2B-F 5.0% 3-HHEB-F 5.0% 5-HHEB-F 5.0% 3-HHEB-3 5.0% 5-HHEB-5 5.0% 3-HHEB (2F, 3F) -F 6.0% 5-HHEB (2F , 3F) -F 6.0% 7-HHEB (2F, 3F) -F 5.0% 3-HB (F) BH-3 4.0% 5-HB (F) BH-3 4.0% T _NI = 70.8 (° C.) T _SN <−20 ° C. Δn = 0.069 Δε = 5.1 η ₂₀ = 14.9 (mPa · s) VHR = 98.7% In this liquid crystal composition, Δε is It is different from the present invention because it is positive.

Example 1 3-HB (2F, 3F) -1O1 9.0% 5-HB (2F, 3F) -1O1 9.0% 3-HHB (2F, 3F) -1O1 12.0% 5- HHB (2F, 3F) -1O1 14.0% 3-HBB (2F, 3F) -1O1 10.0% 5-HBB (2F, 3F) -1O1 5.0% 3-HH-4 10.0% 3 -HH-2 5.0% 3-HH-O1 5.0% 3-HH-O3 6.0% 5-HH-O1 5.0% T _NI = 66.1 (° C.) T _SN <−30 ° C. Δn = 0.076 Δε = −3.6 η ₂₀ = 22.6 (mPa · s) VHR (25 ° C.) = 99.0% In this liquid crystal composition, the value of Δn is preferable, and at 25 ° C. The value of the voltage holding ratio was also high.

Example 2 3-HB (2F, 3F) -1O1 12.0% 5-HB (2F, 3F) -1O1 11.0% 3-HHB (2F, 3F) -1O1 14.0% 5- HHB (2F, 3F) -1O1 15.0% 3-HBB (2F, 3F) -1O1 6.0% 5-HBB (2F, 3F) -1O1 6.0% 3-HBB (2F) -1O1 6.0. 0% 5-HBB (2F) -1O1 6.0% 3-HH-4 6.0% 3-HH-2 5.0% 3-HH-O1 4.0% 3-HH-O3 5.0% 5-HH-O1 4.0% T _NI = 69.0 (° C.) T _SN <−30 ° C. Δn = 0.081 Δε = −3.4 η ₂₀ = 25.2 (mPa · s) VHR = 99. 1% This liquid crystal composition had a suitable value of Δn and a high value of the voltage holding ratio at 25 ° C.

Example 3 3-HB (2F, 3F) -1O1 4.0% 5-HB (2F, 3F) -1O1 4.0% 3-HHB (2F, 3F) -1O1 12.0% 5- HHB (2F, 3F) -1O1 13.0% 3-HBB (2F, 3F) -1O1 10.0% 5-HBB (2F, 3F) -1O1 10.0% 3-HHEH-3 5.0% 3 -HHEH-5 5.0% 4-HHEH-3 5.0% 3-HH-4 5.0% 3-HH-5 5.0% 3-HH-O1 6.0% 3-HH-O36 0.0% 3-HB-O1 5.0% 3-HB-O2 5.0% T _NI = 61.5 (° C.) T _SN <−20 ° C. Δn = 0.066 Δε = −2.3 η ₂₀ = 26.5 (mPa · s) VHR = 98.5% This liquid crystal composition preferably has a value of Δn and a high voltage holding ratio at 25 ° C. won.

Example 4 3-HB (2F, 3F) -1O1 12.0% 5-HB (2F, 3F) -1O1 11.0% 3-HHB (2F, 3F) -1O1 14.0% 5- HHB (2F, 3F) -1O1 15.0% 3-HBB (2F, 3F) -1O1 14.0% 5-HBB (2F, 3F) -1O1 10.0% 3-HH-4 6.0% 3 -HH-5 5.0% 3-HH-O1 4.0% 3-HH-O3 5.0% 5-HH-O1 4.0% T _NI = 67.3 (° C.) T _SN <−20 ° C. Δn = 0.080 Δε = −3.6 η ₂₀ = 24.7 (mPa · s) VHR = 99.3% In this liquid crystal composition, the value of Δn is preferable, and the voltage holding ratio at 25 ° C. Was also high.

Example 5 3-HB (2F, 3F) -1O1 7.0% 5-HB (2F, 3F) -1O1 7.0% 3-HHB (2F, 3F) -1O1 14.0% 5- HHB (2F, 3F) -1O1 15.0% 3-HBB (2F, 3F) -1O1 12.0% 5-HBB (2F, 3F) -1O1 11.0% 3-HBB (2F) -1O1 5. 0% 5-HBB (2F) -1O1 5.0% 3-HH-4 6.0% 3-HH-5 5.0% 3-HH-O1 4.0% 3-HH-O3 5.0% 5-HH-O1 4.0% T _NI = 77.2 (° C.) T _SN <−30 ° C. Δn = 0.090 Δε = −3.4 η ₂₀ = 29.5 (mPa · s) VHR = 99. 0% This liquid crystal composition had a suitable value of Δn and a high voltage holding ratio at 25 ° C.

Example 6 3-HB (2F, 3F) -1O1 5.0% 5-HB (2F, 3F) -1O1 5.0% 3-HHB (2F, 3F) -1O1 12.0% 5- HHB (2F, 3F) -1O1 8.0% 3-HBB (2F, 3F) -1O1 10.0% 5-HBB (2F, 3F) -1O1 8.0% 3-HHB-O2 10.0% 3 -HBB-2 11.0% 5-HB-3 13.0% 3-HB-O2 10.0% 3-HB (F) BH-3 4.0% 5-HB (F) BH-3 0% T _NI = 91.6 (° C.) T _SN <−20 ° C. Δn = 0.09 Δε = −2.7 η ₂₀ = 23.9 (mPa · s) VHR = 99.3% , Δn were suitable, and the value of the voltage holding ratio at 25 ° C. was also high.

Example 7 3-HB (2F, 3F) -1O1 4.0% 3-HHB (2F, 3F) -1O1 12.0% 5-HHB (2F, 3F) -1O1 13.0% 3- HBB (2F, 3F) -1O1 10.0% 5-HBB (2F, 3F) -1O1 10.0% 3-HBB (2F) -1O1 4.0% 3-HHEH-3 5.0% 3-HHEH -5 5.0% 3-HHB-1 5.0% 3-HH-4 5.0% 3-HH-5 5.0% 3-HH-O1 6.0% 3-HH-O3 6.0 % 3-HB-O1 5.0% 3-HB-O2 5.0% T _NI = 65.1 (° C.) T _SN <−20 ° C. Δn = 0.076 Δε = −2.2 η ₂₀ = 26. 6 (mPa · s) VHR = 98.5% In this liquid crystal composition, the value of Δn was suitable, and the value of the voltage holding ratio at 25 ° C. was also high. .

Example 8 3-HB (2F, 3F) -1O1 5.0% 3-HHB (2F, 3F) -1O1 12.0% 5-HHB (2F, 3F) -1O1 8.0% 3- HBB (2F, 3F) -1O1 10.0% 5-HBB (2F, 3F) -1O1 8.0% 5-HBB (2F) -1O1 5.0% 3-HHB-O2 10.0% 3-HBB -2 11.0% 5-HB-3 13.0% 3-HB-O2 10.0% 3-HB (F) BH-3 4.0% 1O1-HBBH-5 4.0% T _NI = 97 6.6 (° C.) T _SN <−20 ° C. Δn = 0.115 Δε = −2.2 η ₂₀ = 26.1 (mPa · s) VHR = 99.3% In this liquid crystal composition, the value of Δn is It was suitable, and the value of the voltage holding ratio at 25 ° C. was also high.

Example 9 5-HB (2F, 3F) -1O1 5.0% 3-HHB (2F, 3F) -1O1 3.0% 3-HBB (2F) -1O1 3.0% 3-HH- 2 6.0% 3-HH-4 6.0% 5-HH-O1 5.0% 3-HB-O2 10.0% 3-HB-O4 10.0% 3-HHB-3 6.0% 3-HHB-O1 8.0% 3-HHB-O2 8.0% 3-HBB-2 10.0% 3-HHEH-3 5.0% 3-HHEH-5 5.0% 4-HHEH-3 5.0% 3-HB (F) BH-3 4.0% 5-HB (F) BH-3 4.0% T _NI = 80.9 (° C.) T _SN <−20 ° C. Δn = 0.081 _{Δε = -0.4 η 20 = 14.4 (} mPa · s) VHR = 98.8% this liquid crystal composition is suitably a value of △ n, the voltage holding ratio at 25 ° C. The value was also high.

Example 10 5-HB (2F, 3F) -1O1 5.0% 3-HBB (2F, 3F) -1O1 3.0% 3-HH-2 5.0% 3-HH-4 0% 3-HH-O1 5.0% 3-HH-O3 6.0% 5-HH-O1 5.0% 3-HB-O4 10.0% 5-HB-3 12.0% 3-HHB -1 8.0% 3-HHB-3 5.0% 3-HHB-O2 5.0% 3-HBB-2 2.0% 3-HHEH-3 5.0% 3-HHEH-5 5.0 % 3-HB (F) BH-3 5.0% 101-HBBH-5 4.0% T _NI = 65.8 (° C.) T _SN <−20 ° C. Δn = 0.066 Δε = −0.3 η ₂₀ = 11.3 (mPa · s) VHR = 99.0% In this liquid crystal composition, the value of Δn was suitable, and the value of the voltage holding ratio at 25 ° C. was also high.

Example 11 3-HB (2F, 3F) -1O1 9.0% 5-HB (2F, 3F) -1O1 9.0% 3-HHB (2F, 3F) -1O1 12.0% 5- HHB (2F, 3F) -1O1 14.0% 3-HBB (2F) -1O1 15.0% 5-HBB (2F) -1O1 10.0% 3-HH-4 5.0% 3-HH-5 10.0% 3-HB-O4 5.0% 3-HHB-1 5.0% 3-HHB-O1 6.0% T _NI = 82.7 (° C.) T _SN <−20 ° C. Δn = 0. 112 Δε = −3.0 η ₂₀ = 26.1 (mPa · s) VHR = 99.3% In this liquid crystal composition, the value of Δn is suitable, and the value of the voltage holding ratio at 25 ° C. is high. Was.

Example 12 3-HB (2F, 3F) -1O1 10.0% 5-HB (2F, 3F) -1O1 8.0% 3-HHB (2F, 3F) -1O1 12.0% 3- HBB (2F, 3F) -1O1 8.0% 3-HBB (2F) -1O1 5.0% 5-HBB (2F) -1O1 5.0% 3-HH-4 5.0% 3-HH-O3 5.0% 5-HB-3 13.0% 3-HHB-1 10.0% 3-HHB-3 11.0% 3-HB (F) BH-3 4.0% 5-HB (F) BH-3 4.0% T _NI = 86.4 (° C.) T _SN <−20 ° C. Δn = 0.081 Δε = −2.5 η ₂₀ = 19.1 (mPa · s) VHR = 99.1% In this liquid crystal composition, the value of Δn was suitable, and the value of the voltage holding ratio at 25 ° C. was also high.

[0028]

As shown in the comparative examples and examples, the present invention can satisfy the various characteristics required for the liquid crystal composition for AM-LCD, and can provide a suitable value of Δn particularly depending on the cell thickness. Thus, a liquid crystal composition having a negative and dielectric anisotropy can be provided.

Claims (5)

[Claims] Claims: 1. A first component containing at least one compound selected from the group of compounds represented by the general formula (I), and a second component comprising a compound represented by the general formula (II-1) or (II)
At least one selected from the group of compounds represented by -2)
A liquid crystal composition comprising: Embedded image (Wherein, R ¹ , R ² , R ³ and R ⁴ each independently represent an alkyl group having 1 to 10 carbon atoms, Y represents H or F, and p, q and r each independently represent 1 And each atom constituting these compounds may be substituted with its isotope.) 2. The liquid crystal according to claim 1, wherein the first component is 3 to 25% by weight and the second component is 3 to 70% by weight based on the total weight of the liquid crystal composition. Composition 3. A compound comprising at least one compound selected from the group of compounds represented by formula (I) as a first component, and a compound represented by formula (II-1) or (I) as a second component:
It contains at least one compound selected from the group of compounds represented by I-2), and is further selected from the group of compounds represented by general formulas (III-1) to (III-6) as a third component. The liquid crystal composition according to claim 1, wherein the liquid crystal composition contains at least one compound. Embedded image (Wherein, R ⁵ and R ⁶ each independently represent a carbon number of 1 to 1)
0 represents an alkyl group, wherein any non-adjacent methylene group (CH2) in the alkyl group is an oxygen atom (O)
Y represents H or F, and each atom constituting these compounds may be substituted with its isotope. ) 4. The liquid crystal composition according to claim 1, wherein the first component is 3 to 25% by weight, the second component is 3 to 70% by weight, and the third component is 90% by weight or less based on the total weight of the liquid crystal composition. The liquid crystal composition according to claim 3. 5. A liquid crystal display device using the liquid crystal composition according to claim 1.