TWI670360B - Liquid crystal composition with negative dielectric anisotropy and application thereof - Google Patents

Abstract

The invention provides a liquid crystal composition comprising: a compound of formula I; one or more compounds selected from the group consisting of compounds of general formulae II-1, II-2, II-3 and II-4; one or more general formulas Compounds of III; one or more compounds selected from the group consisting of compounds of general formulae IV-1 and IV-2; and one or more compounds of general formula V. The liquid crystal composition of the present invention has suitably large optical anisotropy and dielectric anisotropy, a suitably high clearing point, good low-temperature storage stability, low rotational viscosity, and good reliability, and is suitable for liquid crystal display devices. in.

Description

   Liquid crystal composition with negative dielectric anisotropy and application thereof   

The invention relates to a liquid crystal composition, in particular to a liquid crystal composition with a dielectric anisotropy having a negative value. The present invention also relates to a liquid crystal display device including the liquid crystal composition.

The liquid crystal display device uses the optical anisotropy and the dielectric anisotropy of the liquid crystal material to work, and has been widely used. Using the different characteristics and working methods of liquid crystal materials, the device can be designed into various working modes. Among them, TN mode is commonly used in conventional displays (that is, twisted nematic mode-liquid crystal compounds have a nematic structure twisted by about 90 degrees). STN mode (i.e. super twisted nematic mode), SBE mode (i.e. super twisted birefringence mode), ECB mode (i.e. electronically controlled birefringence mode), VA mode (i.e. vertical alignment mode), IPS mode (i.e. in-plane conversion) Mode), etc., there are many improved modes based on the above various modes. Devices working in TN, STN, and SBE modes generally use positive dielectric anisotropic liquid crystals, devices working in ECB and VA modes use negative dielectric anisotropic liquid crystals, and IPS mode can use both positive dielectric anisotropic liquid crystals. Negative dielectric anisotropic liquid crystals can also be used.

Among these display methods, IPS type, ECB type, VA type, and the like have a feature that a liquid crystal material that displays a negative value using Δε. Among these display methods, in particular, the VA type display method driven by AM is used for display elements that require high speed and wide viewing angles, such as televisions.

Nematic liquid crystal compositions used for display modes such as VA require low voltage driving, high response speed, and a wide operating temperature range. That is, it is required that Δε is negative and has a large absolute value, low viscosity, and high nematic phase-isotropic liquid phase transition temperature (T _ni ). In addition, by setting the product of the refractive index anisotropy (Δn) and the cell gap (d), that is, Δn × d, it is necessary to adjust Δn of the liquid crystal composition to an appropriate range in accordance with the cell gap. In addition, when a liquid crystal display element is applied to a display device such as a television, a high response speed is required. Therefore, a liquid crystal material is required to have a low viscosity (η).

In addition to the pursuit of response speed for LCD, especially IPS mode, liquid crystal displays will experience visible UV radiation, high temperature, and long-term addressing during manufacturing and use. For liquid crystal materials after these processes, Reliability has high requirements, so the weather resistance of liquid crystal materials, thermal stability, high and low temperature storage performance, and UV stability have also been the direction that needs to be improved.

As a liquid crystal material with a negative Δε, many similar examples of liquid crystal use have been disclosed, such as US7390539B2, EP1840186B1, and liquid crystal compositions using a negative dielectric liquid crystal component such as CWO, CCWO, or CPWO as shown below .

Here, R is an alkyl group.

For matching the thickness of the small cell, a larger Δn is required for the liquid crystal material. The prior art documents CN104342165A, JP5678554B2, US8673411, CN104428396A disclose the use of a CPWO-type liquid crystal composition with a moderate refractive index or use as a medium refractive index as shown below. Components of PP, PWP or CPP to increase the mixed liquid crystal Δn.

Here, R is an alkyl group or an alkoxy group.

However, due to the negative dielectric constant of CWO, CCWO, and CPWO-based liquid crystal components, and the refractive indices of PP, PWP, CPWO, and PP are only moderate and not large enough, the response speed of such currently disclosed liquid crystal compositions has not yet reached Demand, or there is a lot of room for improvement.

In order to make up for the lack of response speed, some examples of liquid crystal use have also been disclosed, such as KR10118293B1, JP4712137B2, TW1247793B, CN101864318B, CN103382392B, which disclose the use of olefin-terminated neutral bicyclohexane monomer liquid crystal components to reduce the viscosity of liquid crystals. However, the common disadvantages of these components are their sensitivity to UV and high temperature, and poor reliability, especially the realization that VHR has obvious disadvantages after initial and UV high temperature.

An object of the present invention is to provide a liquid crystal composition having negative dielectric anisotropy. The liquid crystal composition has a negative dielectric anisotropy having a relatively large absolute value, a large optical anisotropy, and an appropriate clearing point. , Low rotational viscosity and good ultraviolet and high temperature reliability, suitable for use in liquid crystal display devices, liquid crystal displays containing the negative dielectric anisotropic liquid crystal composition of the present invention can meet the requirements of The case of bicyclohexane monomers keeps responding quickly to demand.

Another object of the present invention is to provide a liquid crystal display device including the liquid crystal composition.

An aspect of the present invention provides a liquid crystal composition, wherein the liquid crystal composition comprises: a compound of formula I One or more compounds selected from the group consisting of compounds of the general formulae II-1, II-2, II-3 and II-4 One or more compounds of formula III One or more compounds selected from the group consisting of compounds of the formulae IV-1 and IV-2 One or more compounds of formula V Among them, R ₁ independently represents H and a straight or branched alkyl or alkoxy group having 1 to 10 carbon atoms; R ₂ independently represents H and a straight or branched alkyl group having 1 to 10 carbon atoms R ₃ , R ₄ , R ₅ , R ₆ , R ₉ and R ₁₀ each independently represent H, a straight or branched chain alkyl or alkoxy group having 1 to 10 carbon atoms, or a carbon number of 2-10 alkenyl or alkenyloxy.

The liquid crystal composition according to the present invention does not include compounds of the general structure A and B: Among them, R ₁ ¹ , R ₁ ² , R ₂ ¹ and R ₁ ² each independently represent an alkyl or alkoxy group of 1 to 10 carbon atoms.

In some embodiments of the present invention, it is preferred that each of R ₁ and R ₂ independently represents a linear or branched alkyl group having 1 to 7 carbon atoms; further preferably, a linear alkyl group having 1 to 5 carbon atoms base.

In some embodiments of the invention, it is preferred that the R ₃ , R ₄ , R ₅ , R ₆ , R ₉ and R ₁₀ each independently represent a straight or branched chain alkyl or alkane having 1 to 7 carbon atoms. Oxygen, or alkenyl or alkenyloxy having 2 to 7 carbon atoms, more preferably straight or branched alkyl or alkoxy having 1 to 5 carbon atoms, or 2 to 5 carbon atoms Alkenyl or alkenyloxy.

In some embodiments of the present invention, the liquid crystal composition further comprises: 1-20% of one or more compounds of the general formula VI, which accounts for 1-20% of the total weight of the liquid crystal composition. Among them, R ₁₁ and R ₁₂ each independently represent H, a straight or branched chain halogenated or unhalogenated alkyl or alkoxy group having 1 to 10 carbon atoms, or 2 to 10 carbon atoms Linear or branched halogenated or unhalogenated alkenyl or alkenyloxy; , with Each independently or ,among them, One or more of -CH ₂ -may be replaced by O, One or more H may be replaced by F, provided that the substitution positions are not adjacent; Z- ₁ represents a single bond, -CH ₂ O-, -O CH _2- , -COO-, or -OCO-; m represents 0 Or 1.

In some embodiments of the present invention, the liquid crystal composition further comprises: 0-10% of the total weight of the liquid crystal composition, one or more compounds of the general formula Ⅶ Wherein, R ₁₃ and R ₁₄ each independently represent H, a linear or branched alkyl or alkoxy group having 1 to 10 carbon atoms, or an alkenyl or alkenyl group having 2 to 10 carbon atoms; Y ₁ means H or F.

In some embodiments of the present invention, the compound of the general formula I accounts for 5-25% of the total weight of the liquid crystal composition; the compound of the general formula II accounts for 10-40% of the total weight of the liquid crystal composition The compound of the general formula III accounts for 5-30% of the total weight of the liquid crystal composition; the compound of the general formula IV accounts for 15-45% of the total weight of the liquid crystal composition; the compound of the general formula V It accounts for 1-15% of the total weight of the liquid crystal composition.

In some embodiments of the present invention, the compound of the general formula I accounts for 5-25% of the total weight of the liquid crystal composition; the compound of the general formula II accounts for 10-40% of the total weight of the liquid crystal composition The compound of the general formula III accounts for 5-30% of the total weight of the liquid crystal composition; the compound of the general formula IV accounts for 15-45% of the total weight of the liquid crystal composition; the compound of the general formula V 1-15% of the total weight of the liquid crystal composition; the compound of the general formula VI accounts for 1-15% of the total weight of the liquid crystal composition; and the compound of the general formula IX accounts for the total weight of the liquid crystal composition 0-10% by weight.

In some embodiments of the present invention, it is preferred that the compound of formula I accounts for 10-25% of the total weight of the liquid crystal composition; and the compound selected from the general formulae II-1, II-2, II-3, and II- The compound of the group 4 comprises 15-35% of the total weight of the liquid crystal composition; the compound of the general formula III accounts for 10-25% of the total weight of the liquid crystal composition; and the compound selected from the general formula IV Compounds of the group consisting of compounds of -1 and IV-2 account for 25-45% of the total weight of the liquid crystal composition; the compound of the general formula V accounts for 1-15% of the total weight of the liquid crystal composition; the The compound of the general formula VI accounts for 1-15% of the total weight of the liquid crystal composition; and the compound of the general formula VII accounts for 0-10% of the total weight of the liquid crystal composition.

In some embodiments of the present invention, it is particularly preferred that the compound of Formula I accounts for 10-20% of the total weight of the liquid crystal composition; and the compound selected from the general formulae II-1, II-2, II-3, and II The compound of the group consisting of compounds of -4 accounts for 20-35% of the total weight of the liquid crystal composition; the compound of the general formula III accounts for 10-20% of the total weight of the liquid crystal composition; Compounds of the group consisting of compounds of IV-1 and IV-2 account for 25-40% of the total weight of the liquid crystal composition; the compound of the general formula V accounts for 1-10% of the total weight of the liquid crystal composition; The compound of the general formula VI accounts for 1-10% of the total weight of the liquid crystal composition; and the compound of the general formula VII accounts for 0-10% of the total weight of the liquid crystal composition.

In some embodiments of the invention, the compound of formula II-1 is selected from the group consisting of: ;as well as

In some embodiments of the invention, the compound of formula II-2 is selected from the group consisting of: ;as well as

In some embodiments of the invention, it is preferred that the compound of formula II-3 is selected from the group consisting of the following compounds: ;as well as

In some embodiments of the invention, it is preferred that the compound of formula II-4 is selected from the group consisting of: ;as well as

In some embodiments of the invention, the compound of Formula III is selected from the group consisting of: ;as well as

In some embodiments of the invention, the compound of formula IV-1 is selected from the group consisting of: ;as well as

In some embodiments of the invention, the compound of formula IV-2 is selected from the group consisting of: ;as well as

In some embodiments of the invention, the compound of general formula V is selected from the group consisting of: ;as well as

In some embodiments of the invention, the compound of Formula VI is selected from the group consisting of: ;as well as Wherein, R ₁₁ and R ₁₂ each independently represent H, a straight or branched chain halogenated or unhalogenated alkyl or alkoxy group having 1 to 6 carbon atoms, or a carbon atom having 2 to 6 carbon atoms. Linear or branched halogenated or unhalogenated alkenyl or alkenyloxy.

In some embodiments of the invention, it is preferred that the compound of formula VI is selected from the group consisting of: ;as well as Wherein, R ₁₁ and R ₁₂ each independently represent H, a straight or branched chain halogenated or unhalogenated alkyl or alkoxy group having 1 to 6 carbon atoms, or a carbon atom having 2 to 6 carbon atoms. Linear or branched halogenated or unhalogenated alkenyl or alkenyloxy.

In some embodiments of the invention, it is preferred that the compound of formula VI-1 is selected from the group consisting of the following compounds: ;as well as

In some embodiments of the invention, it is preferred that the compound of formula VI-2 is selected from the group consisting of: ;as well as

In some embodiments of the invention, it is preferred that the compound of formula VI-3 is selected from the group consisting of the following compounds: ;as well as

In some embodiments of the invention, it is preferred that the compound of formula VI-4 is selected from the group consisting of the following compounds: ;as well as

In some embodiments of the invention, it is preferred that the compound of the general formula VI-5 is selected from the group consisting of: ;as well as

In some embodiments of the invention, it is preferred that the compound of the general formula VI-7 is selected from the group consisting of: ;as well as

In some embodiments of the invention, it is preferred that the compound of formula VI-9 is selected from the group consisting of: ;as well as

In some embodiments of the invention, the compound of the general formula XI is selected from the group consisting of: as well as

In some embodiments of the present invention, it is preferred that the compound of general formula VII is selected from the group consisting of: as well as

The present invention has found that the liquid crystal composition comprising the general formula III and the general formulas IV-1 and / or IV-2 has a larger absolute dielectric anisotropy in the liquid crystal composition according to the present invention. In order to match the general formula V with large optical anisotropy in the present invention, compared to the use of a direct ethylenically-terminated neutral bicyclohexane monomer in the prior art to reduce the viscosity of the composition, the present invention is formulated with an alkyl-terminated The neutral bicyclic monomer is used to reduce the viscosity of the liquid crystal composition. The purpose of reducing the viscosity of the liquid crystal composition is also achieved. At the same time, it is matched with the formula I and the compounds of the general formulas II-1, II-2, II-3 and II-4. The preferred protective group stabilizes the substance, and achieves the effect of improving the response speed and reliability of the current negative liquid crystal composition.

Another aspect of the present invention provides a liquid crystal composition, further comprising one or more additives known to those skilled in the art and described in the literature. For example, 0-15% multicolor dyes and / or chiral dopants can be added.

Possible dopants which are preferably added to the mixture according to the invention are shown below.

;as well as

In the embodiment of the present invention, the dopant preferably accounts for 0-5% of the total weight of the liquid crystal composition; more preferably, the dopant accounts for 0-1% of the total weight of the liquid crystal composition. ; Particularly preferably, the dopant accounts for 0.001-0.8% of the total weight of the liquid crystal composition.

The following mentions, for example, stabilizers which can be added to the mixture according to the invention.

Preferably, the stabilizer is selected from the stabilizers shown below.

In the embodiment of the present invention, preferably, the stabilizer accounts for 0-5% of the total weight of the liquid crystal composition; more preferably, the stabilizer accounts for 0-1% of the total weight of the liquid crystal composition; as In a particularly preferred solution, the stabilizer accounts for 0.001-0.1% of the total weight of the liquid crystal composition.

Another aspect of the present invention provides a liquid crystal display device including the liquid crystal composition of the present invention.

The liquid crystal display device of the present invention may adopt an IPS, VA, NFFS, FFS, PSVA, PSA, or PALC display mode.

Compared with the prior art, the liquid crystal composition of the present invention has a lower viscosity without using an ethylenically-terminated neutral bicyclohexane monomer, and the liquid crystal composition of the present invention has a suitably large optical Anisotropy, proper clearing point, and good reliability are suitable for liquid crystal display devices.

In the present invention, unless otherwise specified, the ratios are all weight ratios, all temperatures are in degrees Celsius, and the box thickness selected for the test of the response time data is 3.7 μm.

The present invention will be described below with reference to specific embodiments. It should be noted that the following embodiments are examples of the present invention, and are only used to illustrate the present invention, but not to limit the present invention. Other combinations and various modifications within the concept of the present invention may be made without departing from the spirit or scope of the present invention.

The liquid crystal displays used in the following embodiments are all negative liquid crystal display devices with a cell thickness d = 4 μm, and are composed of a polarizer (polarizer), an electrode substrate, and the like. The display device is in a normally white mode, that is, when no voltage difference is applied between the row and column electrodes, the observer observes a white pixel color. The axes of the upper and lower polarizers on the substrate are at a 90-degree angle to each other. The space between the two substrates is filled with an optical liquid crystal material.

For ease of expression, in the following examples, the group structure of the liquid crystal composition is represented by the codes listed in Table 1:

Take a compound of the following structural formula as an example:

If the structural formula is expressed by the codes listed in Table 2, it can be expressed as: nCPUF, where n represents the number of C atoms of the left alkyl group, for example, n is "3", which means that the alkyl group is -C ₃ H ₇ ; C in the code represents cyclohexane.

The abbreviations of the test projects in the following examples are as follows:

Cp: clear point (nematic-isotropic phase transition temperature, ℃)

△ n: optical anisotropy (589nm, 25 ° C)

△ ε dielectric anisotropy (1KHz, 25 ℃)

γ1: Rotational viscosity (mPa * s, at 25 ° C)

T _cn : lower limit temperature of nematic phase

Vth threshold voltage (V, 1KHZ, 25 ° C)

VHR (UV) Voltage holding rate (365nm 5mw / cm ² UV light irradiation for 20min)

Among them, the optical anisotropy was measured using an Abbe refractometer under a sodium light (589 nm) light source at 25 ° C.

γ1 is obtained by testing with a LCM-2 liquid crystal physical property evaluation system; the test temperature is 25 ° C, and the test voltage is 300V-400V.

Comparative Example 1

The liquid crystal composition of Comparative Example 1 was formulated according to the compounds and weight percentages listed in Table 2, which was filled between two substrates of a liquid crystal display for performance testing. The test data is shown in the following table:

Comparative Example 2

The liquid crystal composition of Comparative Example 2 was formulated according to the compounds and weight percentages listed in Table 3, which was filled between the two substrates of the liquid crystal display for performance testing. The test data is shown in the following table:

Comparative Example 3

The liquid crystal composition of Comparative Example 3 was prepared according to the compounds and weight percentages listed in Table 4, which was filled between the two substrates of the liquid crystal display for performance testing. The test data is shown in the following table: Table 4 Liquid crystal composition formula and Its test performance

Example 1

The liquid crystal composition of Example 1 was prepared according to the compounds and weight percentages listed in Table 5. The liquid crystal composition was filled between two substrates of a liquid crystal display for performance testing. The test data is shown in the following table:

By comparing the performance of the negative liquid crystals disclosed in Comparative Example 1 with Comparative Example 1, Comparative Example 2, and Comparative Example 3, it can be seen that the CPWO or PWP types used in Comparative Example 1, Comparative Example 2, and Comparative Example 3 Or CWO / CCWO-based negative liquid crystal monomers, the dielectric constant of such monomers is not large enough, resulting in a significant room for improvement in the response of the liquid crystal composition. The liquid crystal composition of the present invention has a significantly low viscosity without using CPWO or PWP or CWO / CCWO negative liquid crystal monomers and alkenyl-terminated bicyclohexane monomers. The response is faster on the display.

Comparative Example 4

The liquid crystal composition of Comparative Example 4 was prepared according to the compounds and weight percentages listed in Table 6, which was filled between the two substrates of the liquid crystal display for performance testing. The test data is shown in the following table:

Comparative Example 5

The liquid crystal composition of Comparative Example 5 was prepared according to the compounds and weight percentages listed in Table 7, which was filled between the two substrates of the liquid crystal display for performance testing. The test data is shown in the following table:

Example 2

The liquid crystal composition of Example 2 was prepared according to the compounds and weight percentages listed in Table 8. The liquid crystal composition was filled between two substrates of a liquid crystal display for performance testing.

Add 250 PPM stabilizer to the liquid crystal composition in Table 8 .

Example 3

The liquid crystal composition of Example 3 was prepared according to the compounds and weight percentages listed in Table 9, which was filled between the two substrates of the liquid crystal display for performance testing. The test data is shown in the following table:

Add 200 PPM stabilizer to the liquid crystal composition in Table 9 .

Comparative Examples 4 and 5 disclose the use of alkenyl-terminated neutral bicyclohexane monomers, and the liquid crystal composition has a lower γ1. By comparing Example 2, Example 3, Comparative Example 4, and Comparative Example 5, From the VHR data under UV light irradiation, it can be found that the VHR index in Comparative Examples 4 and 5 is low, and there is a problem of poor reliability after UV light irradiation. Although the compositions of Examples 2 and 3 of the present invention are not The alkenyl-terminated neutral bicyclohexane monomer is used, but has a lower viscosity and a significantly higher VHR after UV light irradiation. Therefore, the liquid crystal composition according to the present invention has a significant reliability advantage.

It can be known from the performance test parameters of the liquid crystal composition in Comparative Example 1, Comparative Example 2, Comparative Example 3, Comparative Example 4, Comparative Example 5, Example 1, Example 2 and Example 3 that the present invention passes between the components The synergistic effect makes the provided liquid crystal composition have a suitably high optical anisotropy value, a reasonably high dielectric anisotropy, a reasonably high clearing point, and a good low temperature performance. In particular, the invention improves After the alkenyl-terminated neutral bicyclohexane monomer having a viscosity, the liquid crystal composition of the present invention still has a prominently low viscosity, and at the same time, the liquid crystal composition of the present invention has a suitable clear point and optical anisotropy Value and dielectric anisotropy, and good reliability, suitable for PS, VA, NFFS, FFS, PSVA, PSA, or PALC and other display mode liquid crystal displays, and by adjusting the different proportions of liquid crystal composition components to ensure The need for a liquid crystal display comprising the liquid crystal composition of the present invention to be able to maintain a rapid response without using an ethylenically-terminated neutral bicyclohexane monomer.

Claims (11)

A liquid crystal composition, characterized in that the liquid crystal composition comprises: a compound of formula I One or more compounds selected from the group consisting of compounds of the general formulae II-1, II-2, II-3 and II-4 One or more compounds of formula III One or more compounds selected from the group consisting of compounds of the formulae IV-1 and IV-2 One or more compounds of formula V Among them, R ₁ independently represents H and a straight or branched alkyl or alkoxy group having 1 to 10 carbon atoms; R ₂ independently represents H and a straight or branched alkyl group having 1 to 10 carbon atoms R ₃ , R ₄ , R ₅ , R ₆ , R ₉ and R ₁₀ each independently represent H, a straight or branched alkyl or alkoxy group having 1 to 10 carbon atoms, or a carbon number of 2-10 alkenyl or alkenyloxy; and the liquid crystal composition does not include compounds of the general formulae A and B: Among them, R ₁ ¹ , R ₁ ² , R ₂ ¹ and R ₁ ² each independently represent an alkyl or alkoxy group of 1 to 10 carbon atoms. The liquid crystal composition according to item 1 of the scope of application for patent, the liquid crystal composition further comprising: 1-20% of one or more compounds of the general formula VI accounting for 1-20% of the total weight of the liquid crystal composition Among them, R ₁₁ and R ₁₂ each independently represent H, a straight or branched chain halogenated or unhalogenated alkyl or alkoxy group having 1 to 10 carbon atoms, or 2 to 10 carbon atoms Linear or branched halogenated or unhalogenated alkenyl or alkenyloxy; , with Each independently or ,among them, One or more of -CH ₂ -may be replaced by O, One or more H may be replaced by F, provided that the substitution positions are not adjacent; Z- ₁ represents a single bond, -CH ₂ O-, -OCH _2- , -COO- or -OCO-; m represents 0 or 1. The liquid crystal composition according to item 1 of the scope of application for patent, the liquid crystal composition, further comprising: 0-10% of one or more compounds of the general formula Ⅶ accounting for 0-10% of the total weight of the liquid crystal composition Wherein, R ₁₃ and R ₁₄ each independently represent H, a linear or branched alkyl or alkoxy group having 1 to 10 carbon atoms, or an alkenyl or alkenyl group having 2 to 10 carbon atoms; Y ₁ means H or F. The liquid crystal composition according to any one of claims 1 to 3 in the application, wherein the compound of formula I accounts for 5-25% of the total weight of the liquid crystal composition; Compounds of the group consisting of compounds of -2, II-3 and II-4 account for 10-40% of the total weight of the liquid crystal composition; the compound of the general formula III accounts for 5-30% of the total weight of the liquid crystal composition; the The compound selected from the group consisting of compounds of the formulae IV-1 and IV-2 accounts for 15-45% of the total weight of the liquid crystal composition; the compound of the general formula V accounts for 1-15% of the total weight of the liquid crystal composition. The liquid crystal composition according to item 1 of the scope of patent application, wherein the compound of the general formula II-1 is selected from the group consisting of the following compounds: ;as well as The compound of the general formula II-2 is selected from the group consisting of the following compounds: ;as well as The compound of the general formula II-3 is selected from the group consisting of the following compounds: ;as well as The compound of the general formula II-4 is selected from the group consisting of the following compounds: ;as well as The liquid crystal composition according to item 1 of the scope of patent application, wherein the compound of the general formula III is selected from the group consisting of the following compounds: ;as well as The liquid crystal composition according to item 1 of the scope of patent application, wherein the compound of the general formula IV-1 is selected from the group consisting of the following compounds: ;as well as The liquid crystal composition according to item 1 of the scope of patent application, wherein the compound of the general formula IV-2 is selected from the group consisting of the following compounds: ;as well as The liquid crystal composition according to item 1 of the patent application scope, wherein the compound of the general formula V is selected from the group consisting of the following compounds: ;as well as The liquid crystal composition according to item 3 of the patent application scope, wherein the liquid crystal composition further comprises a stabilizer of 0-5% of the total weight of the liquid crystal composition. A liquid crystal display device includes the liquid crystal composition according to item 1 of the scope of patent application.