JPH01193389A - Liquid crystal composition and liquid crystal display element using said composition - Google Patents

Abstract

PURPOSE:To obtain a liquid crystal composition, consisting of a liquid crystal compound consisting of a specific pyrimidine based compound, liquid crystal compound having negative or zero dielectric anisotropy, etc., and suitable for time-shearing driving. CONSTITUTION:The aimed liquid crystal composition, containing (A) 20-70wt.% liquid crystal compound expressed by the formula (R1 is 2-9C straight-chain alkyl; R2 is 2-9C straight-chain alkyl or alkoxy), (B) 30-80wt.% liquid crystal compound having a negative or substantially zero value of anisotropy ( epsilon) and, as necessary, (C) <=10wt.% liquid crystal compound with a positive anisotropy ( epsilon) and having a positive dielectric anisotropy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a liquid crystal composition suitable for time-division driving and a liquid crystal display element using the same.

[Conventional technology and issues]

M) Liquid crystal display devices having a plurality of pixels arranged in an IJ hook pattern are applied to image display devices such as computer terminal display devices and television receivers. In recent years, image display devices have been particularly required to be larger in size and have higher image quality, and therefore, it is desired to increase the number of pixels and improve contrast. A liquid crystal display device applied to such an image display device has a plurality of electrodes arranged on each inner surface of a pair of opposing substrates, and the opposing portions of these electrodes form a plurality of pixels arranged in a matrix. A simple matrix type twisted nematic liquid crystal display element (hereinafter referred to as matrix TN, LC,
(referred to as an element). This matrix TN
, LC, the elements are driven in a time-division manner.

In such a matrix TN, LC, element,
If an attempt is made to increase the number of pixels in order to increase the resolution or enlarge the display area, the number of scanning lines will inevitably increase, making it necessary to perform high time division driving. However, in this case, as the number of time divisions increases, the difference in effective voltage between the on electric field applied to the liquid crystal to turn on each pixel and the off electric field applied to the liquid crystal to turn off each pixel increases. As a result, the operating margin of the drive voltage becomes smaller, the contrast deteriorates, and the viewing angle characteristics also deteriorate.

The operating margin and contrast of a liquid crystal display element depend on voltage-luminance characteristics. That is, the steeper the change in transmittance with respect to the change in the strength of the electric field applied to the liquid crystal, the larger the operating margin and margin, and the higher the contrast. The steepness of the voltage-luminance characteristic is
As shown in FIG. 1, it is expressed as the ratio between the voltage v5o at which the transmittance becomes 50% and the threshold voltage V (hereinafter referred to as the γ value).

The closer the γ value is to 1, the steeper the change in the transmittance described above, the larger the operating margin, and the higher the contrast.

Furthermore, a MA+JTx display element driven in a high time division manner has a large number of time divisions, and one selection period is short, so it is required to respond at high speed.

As mentioned above, the IJTx display element, which is driven in a high time division manner, has the following characteristics: (1) The γ characteristic is close to 1.

■ Wide viewing angle.

■ Fast response speed.

is required.

The γ characteristic has been studied by M. Chadt et al. According to this research, it is known that the γ value representing the steepness of the voltage-luminance characteristic is expressed by the following formula CI), and it closely matches the characteristics exhibited by an actual element.

Here, v: applied voltage when transmittance becomes 50%.

1. to vc rainbow threshold voltage. : Spray elastic constant of liquid crystal 33 : Bending elastic constant of liquid crystal Δε : Dielectric anisotropy of liquid crystal ε : Transmittance in the direction perpendicular to the liquid crystal molecular axis Δn : Refractive index anisotropy of liquid crystal d : Liquid crystal layer Thickness λ: Likelihood wavelength According to this formula (CI), it is clear that in order to make the γ value close to 1, the first, second, and third terms of the same size should each be close to 1. be. Therefore, in order to improve the γ value characteristics, (,) the ratio between the liquid crystal spray elastic constant 11 and the bending elastic constant Kss (hereinafter referred to as elastic constant ratio K, y/4.) should be small.

(b) Ratio between the dielectric constant in the direction perpendicular to the molecular axis of the liquid crystal and the dielectric anisotropy Δε (hereinafter referred to as the dielectric constant ratio Δε/ξ)
is small.

(e) The value of the product Δn−d of the refractive index anisotropy Δn of the liquid crystal and the liquid crystal layer thickness d is 1.1 (μm) when the wavelength of the incident light is 550 nm.

All you have to do is satisfy both of them at the same time.

In addition, the dependence of contrast on the observation direction (hereinafter referred to as viewing angle characteristics) was studied by G. BAUR, and
d 1quid crystals, Volume 631
Nosl to4, 1981 + “TheInfl
uenec of Matsreal and Dev
ice Parameterson the 0pti
cal Characteristics of Li
QuidCrystal Displays J. According to this report, the viewing angle characteristics depend on the liquid crystal layer thickness d of the liquid crystal display element and the refractive index anisotropy Δn of the liquid crystal. That is, the product Δn of the liquid crystal layer thickness d and the refractive index anisotropy Δn of the liquid crystal
-d (hereinafter referred to as Δn-d) is a large liquid crystal display element,
The viewing angle characteristics are poor because the rate of change in the apparent Δnod is large when the liquid crystal element is viewed from the front and when viewed from an oblique direction. On the contrary, a liquid crystal display element with a small Δnod has good viewing angle characteristics. Furthermore, when comparing liquid crystal display elements with the same Δnod, the smaller the refractive index anisotropy Δn of the liquid crystal, the better the viewing angle characteristics. In other words, good viewing angle characteristics mean that contrast changes little with changes in viewing direction. Therefore, in order to improve viewing angle characteristics, (d) Δn-d should be made small.

(e) Reduce Δn.

All you have to do is satisfy.

Furthermore, regarding the response characteristics, the response time t when the liquid crystal display element turns on. N, and response time t when turning off. 22 are respectively expressed by the following logical formula J1(m), and it is known that there is good agreement with actual measured values.

toN=η/(ε.ΔεE2−Kq2) −
(I[)toFF=η/)(q2- (III)K2S
-2 to 22 However, q=π/d, K=1. 10-1, -1 where η: viscosity ε. : Permittivity in vacuum E : Electric field strength 2 □ : Torsional elastic constant According to these 2, (■), the filtration speed mainly depends on the viscosity η and the electric field strength E. That is, to increase the response speed, (f) reduce the viscosity η.

(g) Increasing the electric field strength.

All you have to do is satisfy.

Therefore, conventional liquid crystal display elements have been designed to satisfy requirement (c) regarding Δn-d among requirements (a) to (c) in order to make the γ characteristic steep. That is, the value of Δn−d was set to 1.1 (μm) in accordance with the wavelength of 550 nm, which is approximately in the center of the wavelength band of visible light. However, the requirements (a) and (b) have not been sufficiently considered. This is because in order to reduce Δε/ε in requirement (b), the value of Δε can be reduced, but in this case, the response speed becomes slower. This is because a liquid crystal composition with a small value of 11 has a high viscosity and tends to form a smectic phase, resulting in a slow response speed and a narrow operating temperature range.

In addition, since the refractive index anisotropy Δn of conventional liquid crystal compositions is generally in the range of 0.13 to 0.16, when the value of Δn-d is set to 1.1 (μm), the liquid crystal layer thickness (interelectrode gap 7°), d is in the range of 7.0 to 8.8 (μm).

In this case, since the liquid crystal layer thickness d is large, the electric field strength is weakened, so the response speed is slow, and the viewing angle characteristics are poor because Δnad is large.

The liquid crystal composition used in the above-mentioned conventional liquid crystal display element has a cyan group at the terminal and a large amount of a liquid crystal compound having a positive dielectric anisotropy Δ6 value to increase the response speed. , the value of the dielectric anisotropy Δε of the liquid crystal composition is increased, and a large amount of a liquid crystal compound having a large value of the refractive index anisotropy Δn is blended. It's getting bigger. Then, by decreasing the value of the liquid crystal layer thickness d of the liquid crystal display element, the electric field strength is increased, and the value of Δn-d is set to 1.1 (μm) (λ = 550 nm).
By setting .gamma., the contrast and wJ image quality can be increased.

However, since the above-described conventional liquid crystal composition has a small value of ε, the value of Δε/ε is, for example, 1.1 or more. In addition, in order to prevent low viscosity and the appearance of smectic phase, we have increased the blending ratio of liquid crystal compounds with low viscosity and stable nematic phase, so the elastic constant ratio K
The value of ss/n is, for example, 1.2 to 1.3 or more.

Such conventional liquid crystal compositions have Δt/ε and 53/ε.
Since the value of KN is large, it is difficult to improve the γ characteristics of a liquid crystal display element using this liquid crystal composition, and the Δ
Since the value of nod was large, it was also difficult to improve the viewing angle characteristics.

The present invention has been made in order to solve the above-mentioned problems, and its purpose is to improve the gamma characteristics, viewing angle characteristics, and/or response speed of a liquid crystal display element driven in a time-division manner by reducing the gamma characteristics to small values. to the elastic constant ratio of! The object of the present invention is to provide a liquid crystal composition having a dielectric constant ratio of Δε/ε of 53/11 and above, and a liquid crystal display element using this liquid crystal composition.

[Means to solve the problem]

In order to achieve this object, the present invention has the following formula: A first liquid crystal material consisting of at least one liquid crystal compound represented by: 20i to 70% by weight; at least one liquid crystal compound having a dielectric anisotropy Δε of negative or substantially rOJ; A third liquid crystal material consisting of 3
0% to 80% by weight; depending on the case, 10% by weight or less of a second liquid crystal material comprising at least one liquid crystal compound having a positive dielectric anisotropy Δε value. do.

Further, the liquid crystal display element of the present invention comprises: a pair of substrates having electrodes provided on opposing inner surfaces thereof so as to face each other; and the liquid crystal composition of the present invention interposed between the pair of substrates. It is configured.

The liquid crystal composition of the present invention described above has a spray elastic constant of
Since the proportion of the pyrimidine liquid crystal compound having a large value of 1 and a small value of 3y/1C11 in the elastic constant ratio was increased, the value of 11 in the elastic constant ratio Kss/ of the entire liquid crystal composition was small. Further, the liquid crystal composition of the present invention has dielectric anisotropy Δε
A pyrimidine-based liquid crystal compound with a slightly positive value of Contains a viscous liquid crystal compound and a high temperature liquid crystal compound. and,
Further, a liquid crystal compound having a positively large value of dielectric anisotropy Δε is not blended at all, or if necessary, is blended only in a very small amount. Therefore, the liquid crystal composition of the present invention has a small value of the dielectric constant ratio Δε/ε and also has a low viscosity.

The liquid crystal display element using the liquid crystal composition of the present invention is
Since the elastic constant ratio Ks37'Fc,1 and the dielectric constant ratio Δε/ε□ of the liquid crystal composition are small, the γ characteristics are best in the range where the value of Δn-d is smaller than 1.1. As a result, high contrast and large operating margins can be obtained, and the response speed is also fast. Furthermore, Δn−
Since the value of d is small, viewing angle characteristics can be improved, and furthermore, since the liquid crystal layer thickness d can be reduced, response speed can be improved.

Preferred embodiments of the liquid crystal composition of the present invention will be described in detail below.

The liquid crystal composition of the present invention mainly contains a pyrimidine-based liquid crystal compound having a small value of elastic constant ratio KssA<, and a value of dielectric anisotropy Δε of O or a slightly positive value; A Nn liquid crystal compound having a dielectric anisotropy Δε of approximately O or a negative value, comprising at least one of a high temperature liquid crystal for expanding the temperature range in which a nematic phase is exhibited, a low viscosity liquid crystal for reducing viscosity, etc. , the composition is blended so that the dielectric anisotropy Δe as a whole becomes a positive value of less than 3. In addition to the above-mentioned composition, the liquid crystal composition of the present invention further includes a small amount of Np71 crystal having a positive dielectric anisotropy Δε so that the dielectric anisotropy Δε of the entire composition is positive. This can also be achieved by blending. The liquid crystal composition formulated in this manner has a spray elastic constant of 1. By using a large amount of liquid crystal compounds that have a particularly large value of The value of the dielectric constant ratio Δε/l is made small.

As in the liquid crystal composition of the present invention, the elastic constant ratio is 33.
/' is 11 and the dielectric constant ratio Δε/e is small.A liquid crystal display element using a liquid crystal composition with a small value of the dielectric constant ratio Δε/e has the best value of γ characteristics in the range of Δn-d that does not conform to the above-mentioned formula (1). It is possible to obtain excellent characteristics such as high contrast, large operating margin, wide viewing angle characteristics, and high speed response.

The liquid crystal composition of the present invention will be explained in further detail.

The pyrimidine-based liquid crystal compound has an alkyl group or an alkoxy group at the end, and has an elastic constant ratio of 33/1. The value of is as small as approximately 0.55, and K11 is thick (1
It is about 8X10-12. As such a liquid crystal compound, a liquid crystal compound represented by the following general formula (1) can be used, and its physical properties are shown in Table 1.

(Here, R1 is a straight-chain alkyl group having 2 to 9 carbon atoms, and R2 is a straight-chain alkyl group or alkoxy group having 2 to 9 carbon atoms.) - Table 1 The liquid crystal compound has a slightly positive dielectric anisotropy Δε, and at least one of these compounds is blended to form the first liquid crystal.

The N,Q crystal compound is a liquid crystal compound having a cyan group at the end and having a positive dielectric anisotropy ΔC value, and is a pyrimidine-based, phenylcyclohexane-based, dioxane-based, or
A biphenyl-based liquid crystal compound is used. These liquid crystal compounds have a particularly large Δe value of 10 to 30, and are used to make the dielectric anisotropy ΔC of the liquid crystal composition positive, and their physical properties are shown in Table 2. . As the liquid crystal compound, liquid crystal compounds shown in Table 2 can be used.

Table 2 (where R3 is a straight chain alkyl group having 4 to 7 carbon atoms,
R4 is a propyl group, R5 is a straight chain alkyl group having 3 to 5 carbon atoms, and R6 is an ethyl group. ) Among the liquid crystal compounds shown in Table 2, especially the sewing machine type liquid crystal compounds represented by the general formula (m) have a small value of 1. in the elastic constant ratio 3y/', and the Elastic constant ratio Ksy”tr
This is effective in reducing the value of At least one of the liquid crystal compounds shown in Table 2 is used to form the second liquid crystal material.

As the Nnd crystal compound, a liquid crystal compound such as an ester cyclohexane type, phenylcyclohexane type, or piphenylcyclohexane type is used. These liquid crystal compounds are
It consists of a low-viscosity liquid crystal compound to adjust the viscosity, a high-temperature liquid crystal compound to widen the temperature range in which it exhibits a nematic phase, etc. As the low-viscosity liquid crystal compound, a liquid crystal compound having a viscosity of 20 to 10 or less, which is shown in Table WJ3 along with its physical properties, can be used.

Table 3 (where R7 is a straight chain alkyl group having 2 to 5 carbon atoms,
R8 is a straight chain alkyl group or alkoxy group having 1 to 5 carbon atoms, R9 is an alkyl group having 3 to 5 carbon atoms, R1° is a straight chain alkyl group or alkoxy group having 1 to 4 carbon atoms,
R25 is a globyl group, and R26 is an ethoxy group. ) Among the liquid crystal compounds in Table 3 above, the liquid crystal compound represented by the general formula (b) has a particularly large value of C, and is effective in reducing the value of Δa/l. All of these liquid crystal compounds have a small Δn and do not increase the Δn of the liquid crystal composition.

A high-temperature liquid crystal compound is a liquid crystal compound that exhibits a transition temperature between a nematic phase and an isotropic liquid, c, p, and temperature (clearing point temperature) of about 60°C to 190°C. Liquid crystal compounds shown in Table 4 can be used.

(Here, R4 is a propyl group, R1□ and R13 are linear alkyl groups having 4 to 5 carbon atoms, and R14 is a straight chain alkyl group having 5 carbon atoms.
to 7 straight chain alkyl groups, R15 is a propyl group, R16
is a straight chain alkyl group having 1 to 3 carbon atoms, R17 is a straight chain alkyl group having 3 to 5 carbon atoms, R48 is an alkoxy group having 1 to 2 carbon atoms, R1 is a pentyl ° group, and R2o is an ethyl group. , R2, is a straight chain alkyl group having 3 to 4 carbon atoms,
R22 represents a straight chain alkyl group having 3 to 5 carbon atoms, R23 represents a straight chain alkyl group having 3 to 4 carbon atoms, and R24 represents a straight chain alkyl group having 2 to 4 carbon atoms. ) Among the liquid crystal compounds shown in Tables 3 and 4,
At least one kind is used to form a third liquid crystal material.

The liquid crystal composition of the present invention comprises the above-mentioned No. 1. The second degree is achieved by blending at least the first liquid crystal material and the third liquid crystal material among the third liquid crystal materials. The first liquid crystal material has an elastic constant ratio Kss/5. In order to fully exhibit the effect of reducing the However, since the viscosity of the first liquid crystal material alone is too high and the operating temperature range is narrow, a third liquid crystal material of 30%
Add at least 3i amount. That is, the first liquid crystal material is 20~
70% by weight. Preferably, the first liquid crystal material has a weight of 26 to 54 mm, and the third liquid crystal material has a weight of 46 to 7 mm.
The blending ratio is 4 by weight.

In this case, the third liquid crystal material includes at least one kind of liquid crystal compound represented by the general formula (b) and the general formula, ω, (
At least one liquid crystal compound represented by at least one general formula among the liquid crystal compounds represented by . The desirable compounding proportions of these general liquid crystal compounds represented by M, (B), am, (IX), (IX) and (TO) are 8 to 60% by weight, 15 to 22% by weight, 12 to 18% by weight, and 4% by weight, respectively. -8% by weight, 7-25% by weight, and 2-4% by weight.

To describe a more desirable embodiment, the third liquid crystal material contains at least one liquid crystal compound represented by the general formula M and at least one liquid crystal compound represented by the general formula
Seeds are blended, and, if necessary, a liquid crystal compound represented by a negative maximum Δε is blended. At this time, the blending ratio of each liquid crystal compound is as follows: 2 liquid crystal compounds of general formula (1)
It is desirable that the liquid crystal compound of general formula 2 is 6 to 30% by weight, the liquid crystal compound of general formula 2 is 50 to 60% by weight, the liquid crystal compound of general formula 1 is 12 to 18t3%, and the liquid crystal compound of general formula . In addition to the general 2M liquid crystal compound, the third liquid crystal material may include the general 2M liquid crystal compound and, if necessary, a low viscosity liquid crystal compound of the general formula (to), a general formula (to) with a large Δn, etc. ) liquid crystal compound is blended. At that time, the general formula (
The liquid crystal compound of I) is 42 to 54% by weight and has the general formula (b)
The liquid crystal compound of general formula (1) is 7 to 25 ft[-H], the liquid crystal compound of general formula (2) is 22 to 35% by weight, and the liquid crystal compound of general formula It is desirable that each of these components be blended in an amount of 4% by weight or less.

Further, the liquid crystal composition of the present invention has an elastic constant ratio of 35/1 to 1.
1, a second liquid crystal material to make the dielectric anisotropy Δε of the entire liquid crystal composition positive, and a second liquid crystal material to lower the viscosity and widen the operating temperature range. This is achieved by blending a third liquid crystal material, respectively. In this case, the first liquid crystal material has an elastic constant ratio of 3 sA
c4. 20 to 6 in order to have a sufficient effect of reducing
In a proportion of 5% by weight, the second liquid crystal material has a dielectric anisotropy Δε
The third liquid crystal material is blended in a proportion of 1Of, which is such that the value of Δ171 does not become smaller than necessary, and the third liquid crystal material is blended in a proportion of 30 to 75% by weight. As the second liquid crystal material, a pyrimidine-based liquid crystal compound has a small elastic constant ratio of 33/, so it is preferable to use a liquid crystal compound represented by the general formula (ID) having a cyano group at the end. , the liquid crystal compound of general formula (II) is desirably blended in a proportion of 5% by weight or less.

The third liquid crystal material includes at least one liquid crystal compound represented by the general formulas cv, ve, and (XV), and a liquid crystal compound represented by the general formulas cv, ve, (X), CG, and (5). At least one of the above is blended. in this case,
The liquid crystal compound of general formula (II) is in a proportion of 6 to 62% by weight, the liquid crystal compound of general formula (b) is in a proportion of 8 to 27% by weight, the liquid crystal compound of general formula (ii) is in a proportion of 10 to 20% by weight, The liquid crystal compound of general formula (■) has a ratio of 3 to 22 parts to 1 part,
The liquid crystal compound has a proportion of 2 to 25% by weight and has the general formula (to)
The liquid crystal compound of the general formula (Korean) has a proportion of 1 to 22% by weight, the liquid crystal compound of the general formula (XV) has a proportion of 5 to 12% by weight, and the liquid crystal compound of the general formula (XV) has a proportion of 15 to 20% by weight, respectively. That is, the third liquid crystal material has the general formula (
It is desirable that the liquid crystal compound of (b) and/or the liquid crystal compound of general formula (a) be blended, and in addition, the liquid crystal compound of general formula (1) and/or general formula (2) to be blended. Further, when only the liquid crystal compound of the general formula M among the general 2M and ① is used, the liquid crystal compound of the general formula 幡, (material) or the liquid crystal compound of the general formula 2 and ＠ is selectively blended. When using both liquid crystal compounds of the general formula 2M and (6), the liquid crystal compound of the general formula 2M and Formula Bond, 00.OG and, if necessary, a liquid crystal compound of general formula (XIV) is selectively blended. In this case, the liquid crystal compound of general formula The liquid crystal compound of formula (2) has a proportion of 8 to 27% by weight, the liquid crystal compound of the general formula (■) has a proportion of 10 to 20% by weight, and the liquid crystal compound of the general formula has a proportion of 3 to 22% by weight. The liquid crystal compound of the formula (2) has a proportion of 2.5 to 22% by weight, the liquid crystal compound of the general formula (to) has a proportion of 1 to 13% by weight, and the liquid crystal compound of the general formula (7) has a proportion of 5 to 22% by weight. It is desirable that they are blended at a ratio of 11 gk, respectively.More preferably, the general formulas (1) and (2).

The proportions of the liquid crystal compounds (XIV:) are 2.5 to 22% by weight, 1 to 13% by weight, and 5 to 11% by weight, respectively.

When the second liquid crystal material represented by the general formula (■) is blended in a proportion of 5 to 10% by weight, the liquid crystal material of the general formula (I) is blended in a proportion of 20 to 30% by weight, 3
The liquid crystal material of general formula (b) is blended in a proportion of 0 to 45% by weight, and the liquid crystal material of general formula (b) is blended in a proportion of 14 to 20% by weight, and the liquid crystal compound of general formula (b) is blended in a proportion of 10 to 21% by weight. It is preferable that the liquid crystal compounds of the general formula (2) are selectively blended in a proportion of 5 to 11% by weight.

When a liquid crystal material represented by general formula (2) is used as the second liquid crystal material, the third liquid crystal material includes a liquid crystal compound of general formula (b), a liquid crystal compound of general formula (2), and a liquid crystal compound of general formula (2). The first liquid crystal material represented by general formula (1) has a weight of 20 to 320 to 32, and the second liquid crystal material represented by general formula (2) has a weight of 20 to 320 to 32. The liquid crystal compound of the general formula (B) of the third liquid crystal material is in a proportion of 42 to 52 weight%, and the liquid crystal compound of the general formula It is desirable that the product compound (2) be blended in a proportion of 18 to 25% by weight.

When a liquid crystal compound represented by the general formula (2) is used as the second liquid crystal material, the third liquid crystal material is a liquid crystal compound represented by the general formula (2) and a general formula (b), (W), or (X).

Liquid crystal compounds (XI[) and (Xll/) are selectively blended.

At that time, the first liquid crystal material is used in a proportion of 40 to 45% by weight, the second liquid crystal material in a proportion of 2 to 7% by weight, and the general formula of the third liquid crystal material (the liquid crystal compound of Toshi is 20 to 45% by weight). It is blended at a ratio of 22% by weight, and is also a general 2M.

(W), 00, 0aI), (XR/) od crystal compound C, smoothness 10-12% by weight, approximately 19% by weight,
It is desirable that the amount is 18 to 22% by weight, approximately 2% by weight, or approximately 10% by weight.

When a liquid crystal compound represented by the general formula (7) is used as the second liquid crystal material, the third liquid crystal material is a liquid crystal compound represented by the general formula (VD
, MD, (XIl), (2) liquid crystal compounds are blended. At that time, the first liquid crystal material is blended at a ratio of approximately 36% by weight, the second liquid crystal material is blended at approximately 1% by weight, and the maximum IMI of the third liquid crystal material, (n, (Xll), (XI)
[[)+7) The l-crystalline compounds are desirably blended in proportions of approximately 15% by weight, approximately 24% by weight, 8 to 11% by weight, and 13 to 16% by weight, respectively.

Further, as a second liquid crystal material, the general formula (ID,
When using a liquid crystal compound represented by general formula (2) and general formula (2), the third liquid crystal material is general formula (2), (2), oO.

The liquid crystal compound (■) is blended. In this case, the first liquid crystal material has a proportion of approximately 44% by weight, the second liquid crystal material has a liquid crystal compound of general formulas (IQ, (V)) in a proportion of approximately 2% by weight, and the third The liquid crystal material is general 2M.

The liquid crystal compounds of (b), (X), and (XD are each about 17
It is preferable to mix it in a proportion of approximately 20% by weight, approximately 14% by weight, or approximately 1% by weight.

〔Example〕

Hereinafter, specific examples of the liquid crystal composition of the present invention will be described.

First, Examples 1 to 9 in which only the first liquid crystal material and the third liquid crystal material were blended are shown in Tables 5 and 6. In this table, MIX-11 and MIX-12 are mixtures of a plurality of liquid crystal compounds represented by general formula (I) as shown in Table 7, respectively. The compositions of Examples 1 to 4 were
A low-viscosity liquid crystal compound of the general formula M and a high-temperature liquid crystal compound of the general formula (■) are blended as liquid crystal materials, and the liquid crystal compound of the general formula (■) with a large negative dielectric anisotropy has a value of Δ6 and Δε/e In order to adjust the General formula (
Since the liquid crystal compound b) has a large value of ε□, it is possible to reduce the value of Δε/e□ without extremely reducing the value of ΔC. Further, the compositions of Examples 5 to 8 contain low-viscosity liquid crystal compounds of the general formulas (to) and (to) as the third liquid crystal material, and high-temperature liquid crystal compounds of the general formula ω, and have refractive index anisotropy. A liquid crystal compound of the general formula (to) with a large Δn is
It is selectively blended to adjust n.

Since the liquid crystal compound of general formula (2) has particularly low viscosity, it can significantly reduce the viscosity of the composition.

Furthermore, the composition of Example 9, as a third liquid crystal material,
A large amount of the liquid crystal compound of the general formula (to) with a large value of ε is blended, and among the high temperature liquid crystal compounds, the general formula (to) with a large value of Δn is blended.
Contains liquid crystal compounds (to). Therefore, the liquid crystal composition of Example 9 has a large Δn and a small value of Δε/C.

The liquid crystal compositions of Examples 1 to 9 described above have a positive dielectric anisotropy Δε because the liquid crystal compound of general formula (1) used for the first liquid crystal material has a positive dielectric anisotropy Δε. It has a dielectric anisotropy Δε of .

Next, the first liquid crystal material, the second liquid crystal material, and the third
Examples of compositions of the present invention in which liquid crystal materials are blended are shown in Examples 10 to 78. Here, MIX-21 is
MIX-22 is a mixture of three types of pyrimidine-based liquid crystal compounds as shown in Table 8, MIX-31 is a mixture of three types of dioxane-based liquid crystal compounds as shown in Table 10, and MIX-31 is an ester cyclohexane system as shown in Table 10. It is a mixture of seven types of liquid crystal compounds.

Examples 10 to 6 using a pyrimidine liquid crystal compound having a cyan group at the end as the second liquid crystal material
6 are shown in Tables 11 to 16. In Examples 10 to 17, general formula (6), (
'119. (Company, Ship 2)'s liquid crystal compound is selectively blended. In Example 1, the proportion of the liquid crystal material having the general formula (XIV) with a negative dielectric anisotropy Δε of the third liquid crystal material is increased, and the proportion of the second liquid crystal material is compared accordingly. It's hitting a lot of targets. In Example 11, the blending ratio of the first liquid crystal material was particularly increased, and the elastic constant ratio was 33/4. This is a composition in which the value of is particularly small. In Examples 12 to 17, as the third liquid crystal material, the compounding ratio of the liquid crystal compound having the general formula (to) with a large value of ε was increased, and ΔC/ε
This is a liquid crystal composition with a small value of

In Examples 18 to 25 shown in Table 12, liquid crystal compounds of the general formulas (-), (2), and Oo are respectively blended as the third liquid crystal material. Since the liquid crystal compound of general formula (6) has a particularly low viscosity, a low viscosity liquid crystal composition can be obtained.

Examples 26 to 30 shown in Table 13 use liquid crystal compounds of the general formulas (b) and (ii) as the third liquid crystal material, and in addition, compounds of the general formula (2) with a negative dielectric anisotropy Δε. ,
The liquid crystal compound (XIV) is selectively blended, and accordingly, the proportion of the second liquid crystal compound having a positive dielectric anisotropy Δε is relatively increased. In this way, when a material with a large negative ΔC and a material with a large positive ΔC are mixed, the value of Δε/8cm becomes small.

Examples 31 to 51 shown in Table 14 are liquid crystal compositions in which general 2M, (to), oo, and (to) liquid crystal compounds are blended in different proportions as the third liquid crystal material. . In these Examples, since the liquid crystal compound of the general formula (to) having a large refractive index anisotropy Δn is blended, the refractive index anisotropy Δn as a composition is relatively large.

Examples 52 to 61 shown in Table 15 use liquid crystal compounds of general 2M, ■ and (to) as the third liquid crystal material, and in addition to these, general formulas 00, (XIV)
A selection of liquid crystal compounds are included. These liquid crystal compositions have a large refractive index anisotropy Δn because they contain a liquid crystal compound of the general formula (to) having a large refractive index anisotropy Δn.

Examples 62 to 66 shown in Table 16 use general formulas (to), (to), (■), 00 as the third liquid crystal material.
The liquid crystal compounds ゜(X), @, and (XV) are selectively blended. These liquid crystal compositions have their refractive index anisotropy Δn, viscosity, and dielectric constant anisotropy Δn adjusted respectively.

Table 8 Table 9 Examples using a phenylcyclohexane liquid crystal compound having a cyan group at the end as the liquid crystal material in Table 2 are shown in Table 1.
It is shown in Table 7. In Examples 67 to 71, a liquid crystal compound represented by the general formula @) was used as the second liquid crystal material, and a liquid crystal compound represented by the general formula (Vl), (■) was used as the third liquid crystal material.
and (to)) liquid crystal compounds are blended in different proportions. General size used as the second liquid crystal material
) is a liquid crystal compound.

Since the viscosity is lower than that of the liquid crystal compound of the general formula (II), the viscosity of the liquid crystal composition can be lowered.

Table 18 shows all examples in which a dioxane liquid crystal compound having a cyano group at the end was used as the second liquid crystal material. In Examples 72 to 74, a liquid crystal compound of the general formula (F) was used as the second liquid crystal material, and a liquid crystal compound of the general formula (B), (VII), (■), (X) was used as the third liquid crystal material. .

The liquid crystal compounds (Xll) and (XIV) are selectively blended. A common liquid crystal compound used as the second liquid crystal material has a larger value of Δε than other liquid crystal compounds used as the second liquid crystal material.

Table 19 shows examples in which a piphenyl-based liquid crystal compound having a cyan group at the end was used as the second liquid crystal material.

In Examples 75 to 77, a liquid crystal compound of general formula M was used as the first liquid crystal material, and general formulas (b), (VII), and (XIl) were used as the third liquid crystal material.

and (Xllll) liquid crystal compounds are blended in different proportions.

A plurality of liquid crystal compounds having different chemical structures can also be used as the second liquid crystal material. Table 20 shows Example 78 in which a liquid crystal compound represented by general formula ([1) and general formula M was used as the second liquid crystal material.
The liquid crystal material has the general formula M.

It is desirable to blend the liquid crystal compounds (■), (X), and (XI).

In each of Examples 1 to 78 described above, a relatively large amount of the liquid crystal compound represented by the general formula (1) of the pirimi-sin type having a small value of 53/KN is blended in the elastic constant ratio. Therefore, the elastic constant ratio values of the fc liquid crystal compositions shown in these Examples are each less than 1.0.

In addition, in these examples, the value of the dielectric anisotropy Δε is positively small and a comparatively large amount of the liquid crystal compound of general formula (1) is blended, or a second compound having a positively large dielectric anisotropy is blended. The blending ratio of the liquid crystal material is appropriately small, and the other liquid crystal materials of WE and 3 contain liquid crystal compounds whose dielectric anisotropy Δε is negative or almost 0. Therefore, the ratio of Δε/ε of the liquid crystal compositions shown in these Examples is 0.5 or less.

Table 21 shows the physical characteristic values of the main compositions of the Examples described above.

The liquid crystal composition of the present invention is used in a twisted nematic mode liquid crystal display element for time-division driving as shown in FIGS. 2 and 3. This liquid crystal display element is constructed as described below.

2 and 3, on a lower substrate 1 made of a transparent glass plate or an optically isotropic glass base, there are first electrodes 2, 2 extending vertically in FIG. ．． ... are arranged, and these first electrodes 2, 2 . An alignment film 3 is formed to cover the surface of the substrate on which the . . . are arranged. On the upper substrate 4 made of the same material as the lower substrate 1, there are second electrodes 5, 5 extending laterally in FIG.
．． ... are arranged, and these second electrodes 5, 5 .
An alignment film 6 that has been subjected to alignment treatment is formed to cover the substrate surface on which the... are arranged. These lower substrate 1 and upper substrate 4 have first electrodes 2, 2 . . . . and second electrode 5.
5. . . are formed on the inside, facing each other with a predetermined gap maintained, and bonded with a sealing material 7. The above-mentioned nematic liquid crystal 8 is sealed in the gap between the lower substrate 1 and the upper substrate 4. This nematic liquid crystal 8
are the first electrode 2 and the second electrode 5, 5 . ···Between,
A liquid crystal layer with a thickness of d is formed.

A pair of polarizing plates 9 and 10 are disposed on the outer sides of the lower substrate 1 and the upper substrate 4, respectively.

4A and 4B show the orientation treatment direction of the orientation film 3.6 and the direction of the polarization axes of the pair of polarizing plates 9, 100. The alignment films 3.6 formed on the electrode formation surfaces of the lower substrate 1 and the upper substrate 4 are subjected to a rubbing treatment, as shown in FIG. 4A. That is, the three alignment films on the lower substrate 1 are rubbed in the alignment treatment direction 11 indicated by the broken line arrow, and the alignment film 6 on the upper substrate 4 is rubbed in the alignment treatment direction 11 at approximately 90'', indicated by the solid line arrow. The nematic liquid crystal 8 is sealed between the upper and lower substrates, which are rubbed in a direction 12 that is aligned by 90 inches.
In this case, the liquid crystal molecules are twisted by approximately 90 degrees. As shown in FIG. 4A, the polarizing axes of the pair of polarizing plates 9 and 10 are the polarizing axis 13 (indicated by a broken arrow) of the lower polarizing plate 9 and the polarizing axis 14 (indicated by a solid arrow) of the upper polarizing plate 10. are substantially parallel to each other and substantially parallel to the alignment treatment direction 12 of the alignment film 6 formed on the upper substrate 4. In addition, the upper and lower polarizing plates are 10°9
As shown in FIG. 4B, the polarizing axis of the lower polarizing plate 9 and the polarizing axis 14 of the upper polarizing plate 10 are substantially parallel to each other,
In addition, it may be substantially parallel to the alignment treatment direction 11 of the alignment film 3 formed on the lower substrate 1.

The above-mentioned liquid crystal display element has a lower substrate 1 as shown in FIG.
The first electrodes 2,2. Terminal 2 of...
h, 2h, . 5m, 5m are connected to the drive circuit 16 via lead wires 17, 17, . In such a liquid crystal display element, the first electrodes 2.2... formed on the lower substrate 1 constitute the column electrodes 18, and the second electrodes 5.5... formed on the upper substrate constitute the column electrodes 18. ... constitutes the row electrode 19.

A portion where these column electrodes 18 and row electrodes 19 intersect with each other via a nematic liquid crystal forms one pixel. The row electrodes 19 are provided with respective first electrodes 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5 from the drive circuit 16, respectively. A scanning signal is supplied to sequentially apply a voltage to the column electrodes 18, and a data signal corresponding to image data is supplied to the column electrode 18 in synchronization with the scanning signal. In this way, the lighting state of each pixel is controlled by applying an electric field to the nematic liquid crystal at the intersection of the row electrode 19 and the column electrode 18 and causing the liquid crystal molecules of the nematic liquid crystal to behave. That is, this liquid crystal display element is time-divisionally driven.

The liquid crystal composition of the present invention described above was used in the liquid crystal display element described above, and the electro-optical characteristics of the liquid crystal display element were measured. Tables 22 and 23 show electro-optical characteristics of liquid crystal display elements using main liquid crystal compositions among the examples of the present invention. Here, the refractive index anisotropy Δ shown in Table 22 is
n is the measured value at λ=589nm, and the contrast is 1/
Transmittance value Y when on in each viewing angle direction when driven with a drive signal of 64 duty. It is the maximum value of the 9 value (YoN/YoFF) obtained by dividing N by the transmittance value when off. The threshold voltage Vth is the applied voltage when the contrast shows the maximum value.

In addition, the response speed is as follows: where T is the time required for the brightness to rise from 10 to 90%, and TD is the time taken to fall from 90 to 10%. T
, +TD)/2. The viewing angle characteristics shown in Table 23 are the threshold voltage when observed from a direction P tilted 10'' in the viewing angle direction from the Z axis perpendicular to the substrate surface of the liquid crystal display element A, as shown in FIG. Let vth (θ = 10') be the threshold voltage vth (θ = 30') when observed from the direction Q tilted 30'' in the viewing angle direction from the Z axis, and let The threshold voltage when observed from the direction Q tilted 10 degrees to vth (θ=-10'
), then vth at a temperature of 25°C (θ=3
0°)/vth(θ=10') or vth(θ=-10
') /"th (θ=10°). Furthermore,
The closer the value is to 1, the better the viewing angle characteristic is, that is, the wider the viewing angle is.

As shown in Tables 22 and 23, the contrast at a viewing angle of 10 d is 11 to 26 reeds.

The response speed is less than 63 m5ec. Regarding the viewing angle characteristics, the viewing angle characteristics at a viewing angle of 110 degrees are 1.15 or less, and the viewing angle characteristics at a viewing angle of 30 degrees are 0.921 or more.

In these liquid crystal display elements, the product Δn-d of the liquid crystal layer thickness d and the refractive index anisotropy of the liquid crystal composition is set to a value smaller than 1.1. That is, the value of Δn-d of these liquid crystal display elements is 0.51 to 0.76, and in this way, the value of Δn-d is different from 1.1, and the liquid crystal display element has good contrast. is obtained. In addition, a liquid crystal display element using a liquid crystal composition having an elastic constant ratio of 55/1 and a dielectric constant ratio Δε/ε of a small value as in the present invention has an elastic constant ratio of 33/ 11 is less than 0.8, and the value of the dielectric constant ratio Δξ/ε is smaller than 0.5, indicating better electro-optical characteristics.

That is, a liquid crystal composition having a small value of Δε/l, which is the ratio between the conductive anisotropy Δε and the dielectric constant ε in the direction perpendicular to the liquid crystal molecular axis,
There is little change in the dielectric constant in response to changes in the alignment state of liquid crystal molecules, and there is little change in the isometric impedance of the liquid crystal, so!
Contrast is improved because the linearity of the electric field applied to the liquid crystal with respect to the voltage applied between the electrodes is improved. Mayu, the response speed of the liquid crystal display element is expressed by the above-mentioned formula (2),
This is expressed as (3).

When transformed as , it becomes . As is clear from these equations (5) and (3), the Sougerei elastic constant of nematic liquid crystal is 1. A liquid crystal display element using a liquid crystal composition in which the elastic constant ratio is decreased by 53/K11k by increasing the rise time t. n and falling time t. Both FFs are small and respond at high speed.

Δ like this. - A liquid crystal display element with a small value of d has better viewing angle characteristics, and since the liquid crystal layer thickness d can be reduced, the electric field strength applied to the liquid crystal composition can be increased to achieve high-speed response.

In particular, when the above-mentioned liquid crystal display element is used as a liquid crystal display element for displaying moving images such as 217 images on a television, the response speed is 30%.
ms@c or less is required. In this case, the Δn-dO value is 0.7 as in Example 20.25°63.
3, 0.76, 0.71, the response speed is slow; When it is 53, the contrast decreases. Therefore, the ΔnodO value is 0.5
It is set in the range of 4 to 0.70. And the liquid crystal layer thickness d
If d is large, the response speed will be slow and the viewing angle characteristics will also be degraded, so the liquid crystal layer thickness d is set to 7 (μm) or less. Further, when the value of the refractive index anisotropy Δn is large, the viewing angle characteristics are deteriorated, so the value of the refractive index anisotropy Δn of the liquid crystal composition is set to 0.
14 or less.

Although the liquid crystal display device using the liquid crystal composition of the above example is excellent in contrast, viewing angle characteristics, and response speed, the threshold voltage is relatively high. This means that the value of Δe/ε is 0
．． In order to make it 5 or less, the value of ε of the liquid crystal compound commonly used is 3 to 5, so the value of Δ8 of the composition can only be increased to about 3 at most. Therefore, as expressed by equation (4), when Δε is small, the threshold voltage V becomes high. The high threshold voltage v0 increases the voltage of the drive signal for driving the liquid crystal display element. However, this drive signal can be arbitrarily set by the drive circuit.

〔Effect of the invention〕

As mentioned above, the liquid crystal composition of the present invention has a high elastic constant ratio! The value of 5g/11 is smaller than that of conventional liquid crystal compositions, and the value of Δ-/e is 0.5 or less.

The value of Δn-d in the time-division driving liquid crystal display element is 1.
A liquid crystal display element having a value smaller than 1 and having excellent characteristics such as contrast could be obtained. and.

A liquid crystal element using the liquid crystal composition of the present invention has a character.

It is most suitable for use in a matrix type display device that displays figures etc. in a large number of plots. In particular, for use in liquid crystal display elements that require high-speed response in order to display television 17 images, etc., it is necessary to have low viscosity and a refractive index anisotropy Δn of 0.
Liquid crystal compositions of 14 or less are suitable.

[Brief explanation of the drawing]

FIG. 1 is a brightness-voltage characteristic diagram for defining the γ characteristics of a liquid crystal display element; FIG. 2 is a cross-sectional view of a liquid crystal display element in which the liquid crystal composition of the present invention is used; FIG. An exploded perspective view showing the schematic structure of the liquid crystal display element shown in the figure; Figures 4A and 4B show the alignment processing direction of the alignment film and the polarization axis of the polarizing plate in the liquid crystal display element shown in Figure 2. FIG. 5 is a perspective view showing the definition of viewing angle characteristics. 1.4... Substrate, 2,5... Electrode, 3,6... Compound film, 7... Seal material, 8... Nematic liquid crystal, 9
．． 10...Polarizing plate. Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 3 Figure 5

Claims (20)

[Claims] (1) General formula ▲ Numerical formula, chemical formula, table, etc. ▼... (I) (Here, R_1 is a straight chain alkyl group with 2 to 9 carbon atoms, R_2 is a straight chain alkyl group with 2 to 9 carbon atoms. 20% to 70% by weight of a first liquid crystal material consisting of at least one liquid crystal compound represented by a linear alkyl group or an alkoxy group; negative or substantially "0" dielectric anisotropy Δε; A third liquid crystal material comprising at least one liquid crystal compound having a value of 3
0% by weight to 80% by weight; depending on the case, positive dielectric anisotropy including 10% by weight or less of a second liquid crystal material consisting of at least one liquid crystal compound having a positive dielectric anisotropy Δε value; A liquid crystal composition with properties. (2) The total of the blending ratio of the first liquid crystal material and the blending ratio of the third liquid crystal material is 100% by weight, and the value of the overall dielectric anisotropy Δε is smaller than 3. The liquid crystal composition described. (3) The third liquid crystal material has a general formula ▲ Numerical formula, chemical formula, table, etc. ▼... (VI) (Here, R_7 is a linear alkyl group having 3 to 5 carbon atoms, R_8 is a carbon 8% to 60% by weight of at least one liquid crystal compound represented by a straight-chain alkyl group or alkoxy group having a number of 1 to 5; Depending on the case, there are general formulas▲mathematical formulas, chemical formulas, tables, etc.▼ ...(VII) ▲There are mathematical formulas, chemical formulas, tables, etc.▼...(VIII) ▲There are mathematical formulas, chemical formulas, tables, etc.▼...(IX) ▲There are mathematical formulas, chemical formulas, tables, etc.▼...・(X) ▲There are mathematical formulas, chemical formulas, tables, etc.▼...(X I) (Here, R_9 is a straight chain alkyl group with 3 to 5 carbon atoms, and R_1_0 is a straight chain with 1 to 4 carbon atoms. Alkyl group or alkoxy group, R_1_1 is a propyl group, R_1_2 and R_1_3 are linear alkyl groups having 4 to 5 carbon atoms, R
_1_4 is a straight chain alkyl group having 5 to 7 carbon atoms, R_1
_5 is a propyl group, R_1_6 is a straight chain alkyl group having 1 to 3 carbon atoms, R_1_7 is a straight chain alkyl group having 3 to 5 carbon atoms, and R_1_8 is an alkoxy group having 1 to 2 carbon atoms. ) and at least one liquid crystal compound represented by
The liquid crystal compound of general formula (VII) is in the range of 15% by weight to 22% by weight, and the liquid crystal compound of general formula (VIII) is 12% by weight.
The liquid crystal compound of general formula (IX) is in the range of 4 to 8 weight%, the liquid crystal compound of general formula (X) is in the range of 7 to 25 weight%, and 3. The liquid crystal composition according to claim 2, wherein the liquid crystal compound of formula (X I ) is blended in an amount of 2% to 4% by weight. (4) The first liquid crystal material contains at least one liquid crystal compound represented by the general formula (I) in a proportion of 20 to 65% by weight, and the second liquid crystal material contains a liquid crystal compound represented by the general formula (II). 2. The liquid crystal composition according to claim 1, wherein at least one liquid crystal compound is blended in a proportion of 10% or less, and the third liquid crystal material is blended in a proportion of 30 to 75% by weight. (5) The first liquid crystal material is 20% by weight to 65% by weight.
The second liquid crystal material has a general formula ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼... (II) ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼... (III) ▲ Mathematical formulas , chemical formulas, tables, etc.▼...(IV) ▲Mathematical formulas, chemical formulas, tables, etc.▼...(V) (Here, R_3 is a straight-chain alkyl group with 4 to 7 carbon atoms, and R_4 is Propyl group, R_5 is a linear alkyl group having 3 to 5 carbon atoms, and R_6 is an ethyl group.
The third liquid crystal material has a general formula ▲ has a mathematical formula, a chemical formula, a table, etc. ▼... (VIII) ▲ has a mathematical formula, a chemical formula, a table, etc. ▼... (IX) ▲ There are mathematical formulas, chemical formulas, tables, etc.▼...(X) ▲There are mathematical formulas, chemical formulas, tables, etc.▼...(X I) ▲There are mathematical formulas, chemical formulas, tables, etc.▼...(XIV) (Here In, R_1_1 is a propyl group, R_1_2 and R
_1_3 is a straight chain alkyl group having 4 to 5 carbon atoms, R_1
_4 is a straight chain alkyl group having 5 to 7 carbon atoms, R_1_5
is a propyl group, R_1_6 is a straight chain alkyl group having 1 to 3 carbon atoms, R_1_7 is a straight chain alkyl group having 3 to 5 carbon atoms, R_1_8 is an alkoxy group having 1 to 2 carbon atoms,
R_2_3 is a straight chain alkyl group having 3 to 4 carbon atoms, R_
2_4 is a straight chain alkyl group having 2 to 4 carbon atoms. )
At least one type of liquid crystal compound represented by ▲ General formula ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼...(VI) ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼... (VII ) ▲There are mathematical formulas, chemical formulas, tables, etc.▼...(XV) (Here, R_7 is a straight chain alkyl group with 3 to 5 carbon atoms, and R_8 is a straight chain alkyl group with 1 to 5 carbon atoms or alkoxy group, R_9 is a linear alkyl group having 3 to 5 carbon atoms, R_1_0 is a linear alkyl group or alkoxy group having 1 to 4 carbon atoms, R_2_5 is a propyl group, and R_2_6 is an ethoxy group). 30% by weight of this third liquid crystal material.
The liquid crystal composition according to claim 1, wherein the liquid crystal composition is blended in a proportion of 75% by weight. (6) General formula (VIII), (IX), (X), (X I
) and (XIV) are respectively 10% to 20% by weight, 3% to 22% by weight,
Liquid crystal compounds compounded in the ranges of 2% to 25% by weight, 1% to 22% by weight, and 5% to 12% by weight and represented by general formulas (VI), (VII) and (XV) are , 6% by weight to 62% by weight, 8% by weight, respectively.
6. The liquid crystal composition according to claim 5, wherein the liquid crystal composition is blended in a range of 27% by weight and 15% by weight to 20% by weight. (7) The liquid crystal composition according to claim 5, wherein the second liquid crystal compound contains at least one liquid crystal compound represented by general formula (II) in a range of 0.5% to 5% by weight. thing. (8) The first liquid crystal compound contains at least one liquid crystal compound represented by the general formula (I) in an amount of 20% to 30% by weight; the second liquid crystal material has the general formula (I) At least one liquid crystal compound represented by (II) exceeds 5% by weight and 10% by weight
The third liquid crystal material is formulated in the following proportions; and the third liquid crystal material has the general formula (VI), (VII), (IX).
and (XIV) are each 3
0% to 45% by weight, 14% to 20% by weight,
6. The liquid crystal composition according to claim 5, wherein the liquid crystal composition is blended in proportions of 10% to 21% by weight and 5% to 11% by weight. (9) The third liquid crystal material has the general formula (VI) or (VIII)
The liquid crystal composition according to claim 5, comprising a liquid crystal compound represented by (IX). (10) The third liquid crystal material has the general formula (VI), (X)
The liquid crystal composition according to claim 5, comprising a liquid crystal compound represented by (X I ) and (X I ). (11) The third liquid crystal material has the general formula (VIII), (I
At least one liquid crystal compound selected from the liquid crystal compounds represented by
20% by weight to 20% by weight, 2.5% to 22% by weight, 1% to 13% by weight, and 5% to 11% by weight, and with general formulas (VI) and (VII). Both of the liquid crystal compounds represented range from 6% to 5% by weight, respectively.
6. The liquid crystal composition according to claim 5, wherein the content is in the range of 0% by weight, 8% by weight to 27% by weight. (12) Claim 11, wherein the third liquid crystal material has a liquid crystal compound represented by general formulas (VIII) and (IX).
The liquid crystal composition described. (13) The liquid crystal composition according to claim 11, wherein the third liquid crystal material has a liquid crystal compound represented by general formula (X). (14) The third liquid crystal material has the general formula (X) and (
Claim 1 comprising a liquid crystal compound represented by X I)
1. The liquid crystal composition according to 1. (15) The third liquid crystal material has the general formula (IX), (X)
The liquid crystal composition according to claim 11, comprising a liquid crystal compound represented by and (X I ). (16) The liquid crystal composition according to claim 11, wherein the third liquid crystal material has a liquid crystal compound represented by general formula (VIII). (17) The liquid crystal composition according to claim 11, wherein the third liquid crystal material has a liquid crystal compound represented by general formula (XIV). (18) A pair of substrates having electrodes provided on opposing inner surfaces so as to face each other; and a liquid crystal composition interposed between the pair of substrates, the liquid crystal composition having the general formula ▲There are mathematical formulas, chemical formulas, tables, etc.▼・・・(
I) At least one liquid crystal compound represented by a first liquid crystal material consisting of 20% to 70% by weight; a third liquid crystal material consisting of at least one liquid crystal compound having a dielectric anisotropy Δε value of negative or substantially “0”;
0% to 80% by weight; Depending on the case, 10% by weight or less of a second liquid crystal material made of at least one liquid crystal compound having a positive dielectric anisotropy Δε value. A liquid crystal display element featuring: (19) The liquid crystal composition consists of only the first liquid crystal material and the third liquid crystal material, and has a dielectric anisotropy Δε smaller than 3 and a dielectric constant ratio Δε/ε of 0.5 or less. The value of ⊥ and the elastic constant ratio K_3_3/K_1_1 of 0.8 or less
19. The liquid crystal display element according to claim 18, having a value of . (20) The liquid crystal composition comprises 20 to 65% by weight of the first liquid crystal material; 10% by weight or less of the second liquid crystal material, and has a general formula ▲ mathematical formula, chemical formula, table, etc. ▼ ...(II) ▲There are mathematical formulas, chemical formulas, tables, etc.▼...(III) ▲There are mathematical formulas, chemical formulas, tables, etc.▼...(IV) ▲There are mathematical formulas, chemical formulas, tables, etc.▼... (V) (Here, R_3 is a straight-chain alkyl group having 4 to 7 carbon atoms, R_4 is a propyl group, R_5 is a straight-chain alkyl group having 3 to 5 carbon atoms, and R_6 is an ethyl group.) 30 to 75% by weight of a third liquid crystal material, which has a general formula ▲Mathematical formula, chemical formula, table, etc.▼...(VIII) ▲Mathematical formula, chemical formula, There are tables, etc.▼...(IX) ▲There are mathematical formulas, chemical formulas, tables, etc.▼...(X) ▲There are mathematical formulas, chemical formulas, tables, etc.▼...(X I) ▲Mathematical formulas, chemical formulas, tables, etc. etc.▼...(XIV) (Here, R_1_1 is a propyl group, R_1_2 and R
_1_3 is a straight chain alkyl group having 4 to 5 carbon atoms, R_1
_4 is a straight chain alkyl group having 5 to 7 carbon atoms, R_1_5
is a propyl group, R_1_6 is a straight chain alkyl group having 1 to 3 carbon atoms, R_1_7 is a straight chain alkyl group having 3 to 5 carbon atoms, R_1_8 is an alkoxy group having 1 to 2 carbon atoms,
R_2_3 is a straight chain alkyl group having 3 to 4 carbon atoms, R_
2_4 is a straight chain alkyl group having 2 to 4 carbon atoms. )
A compound consisting of at least one of the liquid crystal compounds represented by the formula and, depending on the case, a general formula ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼...(VI) ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼...・(VII) ▲There are mathematical formulas, chemical formulas, tables, etc.▼...(XV) (Here, R_7 is a straight-chain alkyl group with 3 to 5 carbon atoms, and R_8 is a straight-chain alkyl group with 1 to 5 carbon atoms. group or alkoxy group, R_9 is a straight chain alkyl group having 3 to 5 carbon atoms, R_1_0 is a straight chain alkyl group or alkoxy group having 1 to 4 carbon atoms, R_2_5 is a propyl group, and R_2_6 is an ethoxy group). 19. The liquid crystal display element according to claim 18, comprising at least one of the liquid crystal compounds shown below.