TWI792023B - Liquid crystal composition containing methoxy bridging negative liquid crystal compound and its application - Google Patents

Abstract

The present invention relates to a liquid crystal composition containing a methoxy bridged negative liquid crystal compound and applications thereof, the liquid crystal composition comprising at least one or more compounds represented by general formula I and one or more compounds represented by general formula II , one or more compounds represented by general formula III and one or more compounds represented by general formula IV. The liquid crystal composition of the invention has a large elastic constant and a fast response time, and can improve the contrast of the liquid crystal display when used in a liquid crystal display.

Description

Liquid crystal composition containing methoxy bridging negative liquid crystal compound and its application

The invention relates to the field of liquid crystal material and its application, in particular to a liquid crystal composition containing a methoxy bridging negative liquid crystal compound and its application.

At present, LCD display, as the most mainstream display, has been widely used in various products. Among them, IPS and FFS mode displays are widely used in mobile phones, notebook computers, and tablets because of their unique hard screen characteristics and very wide viewing angle characteristics. Computers, computer monitors, televisions, etc.

The planar arrangement of IPS and FFS liquid crystals leads to light leakage easily in the dark state, and the contrast performance is obviously inferior to VA (MVA, PVA, UV2A, PSVA) displays. After research, it is found that when the liquid crystal molecules are initially aligned, due to the alignment debris on the surface of the alignment layer, the alignment of the liquid crystal molecules will be disordered, resulting in light leakage in the dark state; how to improve the liquid crystal alignment disorder has become an important issue for how to improve IPS and FFS mode displays. It is found through research that the increase of the elastic constant of the liquid crystal helps to improve the arrangement of the liquid crystal molecules.

For IPS and FFS modes, both positive liquid crystals and negative liquid crystals can be used. Since the negative liquid crystal molecules are arranged perpendicular to the direction of the electric field line under the action of the electric field, relative to the positive liquid crystal molecules along the direction of the electric field under the action of the electric field. Arranged in the line direction, the use of negative polarity avoids the transmittance sacrifice and flicker problems caused by the bending electric field in the IPS and FFS modes, thereby improving the transmittance and flicker of the LCD.

The object of the present invention is to provide a liquid crystal composition with a large elastic constant, so as to achieve the purpose of improving the contrast of liquid crystal displays, and simultaneously the liquid crystal composition has negative dielectric anisotropy, which is used in liquid crystal displays with higher The transmittance and the effect of improving the flicker of the liquid crystal display.

It is well known in the art that increasing the clearing point of the liquid crystal composition can achieve the purpose of increasing the elastic constant, but as the clearing point increases, the rotational viscosity of the liquid crystal composition increases, resulting in a slow response time of the liquid crystal display. Surprisingly, this The liquid crystal composition provided by the invention has large The elastic constant, on the other hand, has a low rotational viscosity, which enables high contrast and fast response LCDs. To achieve the above object, the present invention adopts the following technical solutions:

A liquid crystal composition containing a methoxy bridged negative liquid crystal compound, comprising at least one or more compounds represented by general formula I, one or more compounds represented by general formula II, one or more compounds represented by general formula III And one or more compounds represented by general formula IV.

Described general formula I is specifically:

In the general formula I, R ₁ and R ₂ each independently represent a C ₁ -C ₁₂ straight-chain alkyl group, a straight-chain alkoxy group or a C ₂ -C ₁₂ straight-chain alkenyl group.

The general formula II is specifically:

In the general formula II, R ₃ and R ₄ each independently represent a C ₁ ~C ₁₂ straight-chain alkyl group, a straight-chain alkoxy group or a C ₂ ~C ₁₂ straight-chain alkenyl group; n ₁ is 0 or 1 ; A ₁ each independently represents any of the following:

The general formula III is specifically:

In the general formula III, R ₅ and R ₆ each independently represent a C ₁ -C ₁₂ straight-chain alkyl group, a straight-chain alkoxy group or a C ₂ -C ₁₂ straight-chain alkenyl group; n ₂ is 0 or 1 .

The general formula IV is specifically:

In the general formula IV, R ₇ and R ₈ each independently represent a C ₁ -C ₁₂ straight-chain alkyl group, a straight-chain alkoxy group or a C ₂ -C ₁₂ straight-chain alkenyl group, and each of A ₂ and A ₃ independently represent trans-1,4-cyclohexyl or 1,4-phenylene.

Preferably, in the above liquid crystal composition, the compound represented by the general formula I is formula IA or IB:

In the formulas IA-IC, R ₁ and R ₂ each independently represent a C ₁ -C ₇ linear alkyl group or a C ₂ -C ₇ linear alkenyl group.

More preferably, the compound represented by the general formula I is selected from one or more of the compounds represented by formula IA1~IA63 or formula IB1~IB45:

Further preferably, the compound represented by the general formula I is selected from one of IA3, IA12, IA21, IA23, IA24, IA25, IA39, IA43, IB3, IB5, IB8, IB10, IB26, IB27, IB30, IB31 or Multiple; Still further preferably, the compound represented by the general formula I is selected from one of IA3, IA21, IA23, IA24, IA25, IA39, IA43, IB3, IB5, IB8, IB10, IB26, IB27, IB30, IB31 or more; most preferably, the compound represented by the general formula I The substance is selected from one or more of IA3, IA21, IA23, IA39, IB3, IB5, IB8, IB10, IB26, IB27, IB30, and IB31.

Preferably, in the above-mentioned liquid crystal composition, the compound represented by the general formula II is selected from one or more of the structures shown in the formulas IIA~IIF:

In the formulas IIA~IIF, the definitions of R3 and R4 are the same as above;

More preferably, the compound represented by the general formula II is selected from one or more of formulas IIA1~IIA48, formulas IIB1~IIB48, formulas IIC1~IIC48, formulas IID1~IID48, formulas IIE1~IIE48 or formulas IIF1~IIF48:

Further preferably, the compound represented by the general formula II is selected from one or more of formulas IIA14, IIA16, IIA22, IIC14, IIC15, IID10, IID13, IID14, IID15, IID16, IID18, IIE14, IIE18, IIF13, IIF14 .

Preferably, in the above liquid crystal composition, the compound represented by the general formula III is formula IIIA or IIIB:

In the formulas IIIA and IIIB, R5 and R6 are as defined above;

More preferably, the compound represented by general formula III is selected from one or more of formulas IIIA1~IIIA42 or formulas IIIB1~IIIB42:

Further preferably, the compound represented by the general formula III is selected from one or more of IIIA13, IIIA17, IIIA18, IIIA20, IIIB17, IIIB18, IIIB20; most preferably, the compound represented by the general formula III is selected from IIIA17 , IIIA18, IIIB17, IIIB18, IIIB20 in one or more.

Preferably, in the above-mentioned liquid crystal composition, the compound represented by the general formula IV is selected from one or more of the structures shown in the formulas IVA~IVC:

In the formulas IVA~IVC, the definitions of R ₇ and R ₈ are the same as above;

More preferably, the compound represented by general formula IV is selected from one or more of the compounds represented by formula IVA1~IVA39, formula IVB1~IVB24 or formula IVC1~IVC24:

Further preferably, the compound represented by the general formula IV is selected from one or more of IVA3, IVA7, IVA11, IVA12, IVA25, IVA29, IVA31, IVA37, IVB18, IVB22, IVC2, IVC4, IVC15, IVC20; most preferably Preferably, the compound represented by the general formula IV is selected from one or more of IVA25, IVA29, IVA37, IVB18, IVB22, IVC2, IVC4, IVC15, and IVC20.

Preferably, the above liquid crystal composition also includes one or more compounds represented by the general formula V:

In the general formula V, R ₉ and R ₁₀ each independently represent a C ₁ -C ₁₂ straight-chain alkyl group, a straight-chain alkoxy group, or a C ₂ -C ₁₂ straight-chain alkenyl group; each A ₄ independently represents Trans 1,4-cyclohexyl or 1,4-phenylene.

And/or, also include one or more compounds represented by general formula VI:

In the general formula VI, R ₁₁ and R ₁₂ each independently represent a C ₁ to C ₁₂ straight-chain alkyl group, a straight-chain alkoxy group or a C ₂ to C ₁₂ straight-chain alkenyl group; L ₁ , L ₂ , L ₃ each independently represent H or F.

More preferably, the compound represented by the general formula V is the formula VA or VB:

In the general formula VA or VB, R ₉ and R ₁₀ each independently represent a C ₁ -C ₇ straight-chain alkyl group, a straight-chain alkoxy group or a C ₂ -C ₇ straight-chain alkenyl group.

And/or, the compound represented by the general formula VI is VIA or VIB:

In the general formula VIA or VIB, R ₁₁ each independently represents a C ₁ ~C ₇ straight chain alkyl or a C ₂ ~C ₇ straight chain alkenyl; R ₁₂ each independently represents a C ₁ ~C ₇ straight chain Alkanyl or straight-chain alkoxy.

Further preferably, the compound represented by the general formula V is selected from one or more of the compounds represented by the general formula VA1~VA38 or the formula VB1~VB38:

And/or, the compound represented by general formula VI is selected from one or more of the compounds represented by formula VIA1 ~ VIA24 or formula VIB1 ~ VIB24:

Preferably, the above liquid crystal composition also includes one or more compounds represented by the general formula VII:

In the general formula VII, R ₁₃ and R ₁₄ each independently represent a C ₁ -C ₁₂ linear alkyl group or linear alkoxy group; n ₃ is 0 or 1.

And/or, also include one or more compounds represented by general formula VIII:

In the general formula VIII, R ₁₅ and R ₁₆ each independently represent a C ₁ -C ₁₂ linear alkyl group; L ₄ represents H or F.

More preferably, the compound represented by the general formula VII is the formula VIIA or VIIB:

In the formula VIIA or VIIB, each R ₁₃ independently represents a C ₁ -C ₇ linear alkyl group; each R ₁₄ independently represents a C ₁ -C ₇ linear alkyl group or linear alkoxy group.

And/or, the compound represented by the general formula VIII is formula VIII A or VIII B:

In the formula VIII A or VIII B, R ₁₅ and R ₁₆ each independently represent a straight-chain C ₁ -C ₅ alkyl group.

Further preferably, the compound represented by general formula VII is selected from one or more of the compounds represented by formula VIIA1 ~ VIIA24 or formula VIIB1 ~ VIIB24:

Preferably, in the above liquid crystal composition, the liquid crystal composition contains 2-20 wt% of the compound represented by the general formula I.

Or, the liquid crystal composition comprises 5~55wt% of the compound represented by the general formula II;

Or, the liquid crystal composition comprises 10~50wt% of the compound represented by the general formula III;

Or, the liquid crystal composition comprises 10~55wt% of the compound represented by the general formula IV;

More preferably, the liquid crystal composition comprises 4~15wt% of the compound represented by the general formula I;

Or, the liquid crystal composition comprises 5~15wt% of the compound represented by the general formula I;

Or, the liquid crystal composition comprises 10~50wt% of the compound represented by the general formula II;

Or, the liquid crystal composition comprises 10~30wt% of the compound represented by the general formula II;

Or, the liquid crystal composition comprises 10~25wt% of the compound represented by the general formula II;

Or, the liquid crystal composition comprises 15-40wt% of the compound represented by the general formula III;

Or, the liquid crystal composition comprises 25-40wt% of the compound represented by the general formula III;

Or, the liquid crystal composition comprises 30~38wt% of the compound represented by the general formula III;

Or, the liquid crystal composition comprises 15-50wt% of the compound represented by the general formula IV;

Or, the liquid crystal composition comprises 25~50wt% of the compound represented by the general formula IV;

Or, the liquid crystal composition comprises 30~50wt% of the compound represented by the general formula IV;

Further preferably, the liquid crystal composition comprises 5-12wt% of the compound represented by the general formula I;

Or, the liquid crystal composition comprises 5~10wt% of the compound represented by the general formula I;

Or, the liquid crystal composition comprises 6~12wt% of the compound represented by the general formula I;

Or, the liquid crystal composition comprises 12~46wt% of the compound represented by the general formula II;

Or, the liquid crystal composition comprises 12~30wt% of the compound represented by the general formula II;

Or, the liquid crystal composition comprises 13~23wt% of the compound represented by the general formula II;

Or, the liquid crystal composition comprises 18~35wt% of the compound represented by the general formula III;

Or, the liquid crystal composition comprises 28~35wt% of the compound represented by the general formula III;

Or, the liquid crystal composition comprises 32~35wt% of the compound represented by the general formula III;

Or, the liquid crystal composition comprises 19~47wt% of the compound represented by the general formula IV;

Or, the liquid crystal composition comprises 27~47wt% of the compound represented by the general formula IV;

Or, the liquid crystal composition comprises 19~44wt% of the compound represented by the general formula IV;

Or, the liquid crystal composition contains 32-47wt% of the compound represented by the general formula IV.

In order to improve the synergistic effect between various types of compounds and to make the liquid crystal composition meet different requirements, the present invention optimizes the percentage of each component in the provided liquid crystal composition.

Specifically, the liquid crystal composition of the present invention contains the following components by weight percentage: (1) 2-20% of the compound represented by the general formula I; (2) 5-55% of the compound represented by the general formula II; (3) 10~50% of the compound represented by the general formula III; (4) 10~55% of the compound represented by the general formula IV; (5) 0~25% of the compound represented by the general formula V~VIII.

Or, the liquid crystal composition comprises the following components by weight percentage: (1) 4~15% of the compound represented by the general formula I; (2) 10~50% of the compound represented by the general formula II; (3) 15~ 40% of the compound represented by the general formula III; (4) 15~50% of the compound represented by the general formula IV; (5) 0~20% of the compound represented by the general formula V~VIII; preferably, comprising: (1) 5~12% of the compound represented by the general formula I; (2) 12~46% of the compound represented by the general formula II; (3) 18~35% of the compound represented by the general formula III; (4) 19~47% of the compound represented by the general formula The compound represented by formula IV; (5) the compound represented by 0 ~ 16% general formula V ~ VIII.

Or, the liquid crystal composition comprises the following components by weight percentage: (1) 4~15% of the compound represented by the general formula I; (2) 10~30% of the compound represented by the general formula II; (3) 25~ 40% of the compound represented by the general formula III; (4) 25~50% of the compound represented by the general formula IV; (5) 0~20% of the compound represented by the general formula V~VIII; preferably, comprising: (1) 5~12% of the compound represented by the general formula I; (2) 12~30% of the compound represented by the general formula II; (3) 28~35% of the compound represented by the general formula III; (4) 27~47% of the compound represented by the general formula The compound represented by formula IV; (5) the compound represented by 0 ~ 16% general formula V ~ VIII.

Or, the liquid crystal composition comprises the following components by weight percentage: (1) 4~15% of the compound represented by the general formula I; (2) 10~50% of the compound represented by the general formula II; (3) 15~ 40% of the compound represented by the general formula III; (4) 15 ~ 50% of the compound represented by the general formula IV; (5) 1 ~ 20% of the compound represented by the general formula V ~ VIII; preferably, comprising: (1) 5~10% of the compound represented by the general formula I; (2) 12~46% of the compound represented by the general formula II; (3) 18~35% of the compound represented by the general formula III; (4) 19~44% of the compound represented by the general formula The compound represented by formula IV; (5) 2 ~ 16% of the compound represented by general formula V ~ VIII.

Or, the liquid crystal composition comprises the following components by weight percentage: (1) 5~15% of the compound represented by the general formula I; (2) 10~25% of the compound represented by the general formula II; (3) 30~ 38% of the compound represented by the general formula III; (4) 30~50% of the compound represented by the general formula IV; preferably, including: (1) 6~12% of the compound represented by the general formula I; (2) 13~ 23% of the compound represented by the general formula II; (3) 32~35% of the compound represented by the general formula III; (4) 32~47% of the compound represented by the general formula IV.

The compounds of general formula I provided by the present invention have large elastic constants, the compounds of general formula II and III provided by the present invention have negative dielectric anisotropy, and the compounds represented by general formula IV provided by the present invention With low rotational viscosity, the present invention increases the elastic constant by adding the compound of general formula I, improves the dielectric anisotropy by adding the compound of general formula II and III at the same time, reduces the rotational viscosity by increasing or decreasing the IV compound, and realizes low rotational viscosity Viscosity and large elastic constants enhance the contrast performance of liquid crystal displays.

The preparation method of the liquid crystal composition of the present invention is not particularly limited, and two or more compounds can be produced by mixing two or more compounds by a conventional method, such as by mixing different components at high temperature and dissolving each other, wherein the liquid crystal composition Dissolve in the solvent that is used for this compound and mix, then this solvent is distilled off under reduced pressure; Or the liquid crystal composition of the present invention can be prepared according to conventional method, as wherein the component with smaller content in higher It can be obtained by dissolving in the main component with relatively large content at high temperature, or dissolving each component in an organic solvent, such as acetone, chloroform or methanol, etc., and then mixing the solutions to remove the solvent.

The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention. Unless otherwise specified, percentages in the present invention are percentages by weight; temperature units are degrees Celsius; Δn represents optical anisotropy (25°C); ε _∥ and ε _⊥ represent parallel and perpendicular dielectric constants (25°C, 1000Hz), respectively; △ε represents dielectric anisotropy (25°C, 1000Hz); γ1 represents rotational viscosity (mPa.s, 25°C); Cp represents clearing point of liquid crystal composition (°C); K ₁₁ , K ₂₂ , K ₃₃ represent Spread, torsion and bending elastic constants (pN, 25°C); Kavg represents the average elastic constant ((K11+K22+K33)/3, pN, 25°C).

In the following examples, the group structures in liquid crystal compounds are represented by the codes shown in Table 1.

Take the following compound structure as an example:

Expressed as: 3CLP1

Expressed as: 3CC1OW1

In each of the following examples, the preparation of the liquid crystal composition adopts the thermal dissolution method, including the following steps: use a balance to weigh the liquid crystal compound by weight percentage, wherein there is no specific requirement for the order of weighing and adding, and the melting point of the liquid crystal compound is usually measured from high to low. Sequentially weigh and mix, heat and stir at 60~100°C to make each component melt evenly, then filter, rotary steam, and finally package to obtain the target sample.

In the following examples, the weight percentage of each component in the liquid crystal composition and the performance parameters of the liquid crystal composition are shown in the following tables.

Example 1

Example 2

Table 3: Weight percent and performance parameters of each component in the liquid crystal composition

Example 3

Example 4

Table 5: Weight percent and performance parameters of each component in the liquid crystal composition

Example 5

Example 6

Example 7

Example 8

Example 9

Example 10

Example 11

Example 12

Example 13

Example 14

Example 15

Example 16

Example 17

Example 18

Example 19

Example 20

Example 21

Example 22

Example 23

Table 24: Weight percent and performance parameters of each component in the liquid crystal composition

Example 24

Example 25

Example 26

Example 27

Example 28

Example 29

Example 30

Example 31

Example 32

Example 33

Table 34: Weight percent and performance parameters of each component in the liquid crystal composition

Example 34

Example 35

Comparative example 1

The values of various performance parameters of the liquid crystal compositions obtained in Example 1 and Comparative Example 1 were summarized and compared, see Table 38.

Table 38: Comparison of performance parameters of liquid crystal compositions

After comparison, it can be seen that compared with Comparative Example 1, the liquid crystal composition provided by Example 1 has a larger elastic constant. Compared with Comparative Example 1, the elastic constant of Example 1 is increased by about 10%, that is, it can be used in liquid crystal displays. Increase the contrast by around 10%.

It can be seen from the above examples that the liquid crystal composition provided by the present invention has a large elastic constant, and can effectively improve the contrast of liquid crystal displays when used in IPS and FFS mode displays. Therefore, the liquid crystal composition provided by the present invention is suitable for IPS or FFS type TFT liquid crystal display devices, can significantly improve the problem of light leakage in the dark state of the liquid crystal display, and then improve the contrast of the liquid crystal display, and can improve the contrast characteristics of the IPS or FFS mode liquid crystal display .

Although the present invention has been described in detail with general descriptions and specific embodiments above, it is obvious to those skilled in the art that some modifications or improvements can be made on the basis of the present invention. Therefore, the modifications or improvements made on the basis of not departing from the spirit of the present invention all belong to the protection scope of the present invention.

Claims (12)

A liquid crystal composition containing a methoxy bridge negative liquid crystal compound, characterized in that it comprises at least one compound represented by general formula I, at least one compound represented by general formula II, at least one or more compounds represented by general formula III and at least one compound represented by general formula IV; said general formula I is specifically:

In the general formula I, R ₁ represents C ₁ ~C ₁₂ straight-chain alkyl, straight-chain alkoxy or C ₂ ~C ₁₂ straight-chain alkenyl, R ₂ represents C ₃ ~C ₁₂ straight-chain alkane Oxygen; The general formula II is specifically:

In the general formula II, R ₃ and R ₄ each independently represent a C ₁ ~C ₁₂ straight-chain alkyl group, a straight-chain alkoxy group or a C ₂ ~C ₁₂ straight-chain alkenyl group; n ₁ is 0 or 1 ; A ₁ each independently represents any of the following:

The general formula III is specifically:

In the general formula III, R ₅ and R ₆ each independently represent a C ₁ -C ₁₂ straight-chain alkyl group, a straight-chain alkoxy group or a C ₂ -C ₁₂ straight-chain alkenyl group; n ₂ is 0 or 1 ; The general formula IV is specifically:

In the general formula IV, R ₇ and R ₈ each independently represent a C ₁ -C ₁₂ straight-chain alkyl group, a straight-chain alkoxy group or a C ₂ -C ₁₂ straight-chain alkenyl group, and each of A ₂ and A ₃ independently represent trans-1,4-cyclohexyl or 1,4-phenylene. The liquid crystal composition according to Claim 1, wherein the compound represented by the general formula I is selected from one or more of the following compounds:

The liquid crystal composition as claimed in item 1, wherein the compound represented by the general formula II is selected from one or more of the structures shown in the formulas IIA~IIF:

In the formulas IIA~IIF, R ₃ and R ₄ are as defined in Claim 1. The liquid crystal composition according to Claim 1, wherein the compound represented by the general formula III is the formula IIIA or IIIB:

In the formulas IIIA and IIIB, R ₅ and R ₆ are as defined in Claim 1. The liquid crystal composition as claimed in item 1, wherein the compound represented by the general formula IV is selected from one or more of the structures shown in the formulas IVA~IVC:

In the formulas IVA~IVC, R ₇ and R ₈ are as defined in Claim 1. The liquid crystal composition as claimed in claim 1, further comprising one or more compounds represented by the general formula V:

In the general formula V, R ₉ and R ₁₀ each independently represent a C ₁ -C ₁₂ straight-chain alkyl group, a straight-chain alkoxy group, or a C ₂ -C ₁₂ straight-chain alkenyl group; each A ₄ independently represents trans 1,4-cyclohexyl or 1,4-phenylene; and/or, also include one or more compounds represented by general formula VI:

In the general formula VI, R ₁₁ and R ₁₂ each independently represent a C ₁ to C ₁₂ straight-chain alkyl group, a straight-chain alkoxy group or a C ₂ to C ₁₂ straight-chain alkenyl group; L ₁ , L ₂ , L ₃ each independently represent H or F. The liquid crystal composition as claimed in claim 1, further comprising one or more compounds represented by the general formula VII:

In the general formula VII, R ₁₃ and R ₁₄ each independently represent a C ₁ to C ₁₂ straight-chain alkyl or straight-chain alkoxy; n ₃ is 0 or 1; and/or, it also includes one or more general The compound represented by formula VIII:

In the general formula VIII, R ₁₅ and R ₁₆ each independently represent a C ₁ -C ₁₂ linear alkyl group; L ₄ represents H or F. The liquid crystal composition as claimed in claim 6, further comprising one or more compounds represented by the general formula VII:

In the general formula VII, R ₁₃ and R ₁₄ each independently represent a C ₁ to C ₁₂ straight-chain alkyl or straight-chain alkoxy; n ₃ is 0 or 1; and/or, it also includes one or more general The compound represented by formula VIII:

In the general formula VIII, R ₁₅ and R ₁₆ each independently represent a C ₁ -C ₁₂ linear alkyl group; L ₄ represents H or F. The liquid crystal composition as described in claim 1, wherein the liquid crystal composition comprises 5-20wt% of the compound represented by the general formula I, and the liquid crystal composition comprises 5-55wt% of the compound represented by the general formula II The compound, the liquid crystal composition contains 10-50wt% of the compound represented by the general formula III and the liquid crystal composition contains 10-55wt% of the compound represented by the general formula IV. The liquid crystal composition as described in Claim 8, is characterized in that, the liquid crystal composition comprises the following components by weight percentage: (1) 5~20% of the compound represented by general formula I, (2) 5~55% of the compound represented by the general formula II, (3) 10~50% of the compound represented by the general formula III, (4) 10~55% of the compound represented by the general formula IV and (5) 0~ 25% the compound represented by general formula V～VIII. An application of the liquid crystal composition as described in Claim 9 in a liquid crystal display device, which is an application in an IPS or FFS type liquid crystal display device. An application of the liquid crystal composition as described in Claim 10 in a liquid crystal display device, which is an application in an IPS or FFS type liquid crystal display device.