CN107227159A - One kind has big dielectric anisotropy liquid crystal composition and its application - Google Patents
One kind has big dielectric anisotropy liquid crystal composition and its application Download PDFInfo
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- CN107227159A CN107227159A CN201610173527.3A CN201610173527A CN107227159A CN 107227159 A CN107227159 A CN 107227159A CN 201610173527 A CN201610173527 A CN 201610173527A CN 107227159 A CN107227159 A CN 107227159A
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Abstract
There is big dielectric anisotropy liquid crystal composition the present invention relates to one kind, the compound that the compound and at least one general formula III that compound of the liquid-crystal composition comprising at least one formula I representatives, at least one formula II are represented are represented.Liquid-crystal composition of the present invention has low rotary viscosity, big elastic constant, good low temperature intersolubility and fast response speed, available for the fast-response liquid crystal display of plurality of display modes, its use in TN, IPS or FFS mode display can be obviously improved liquid crystal display display effect.
Description
Technical field
The present invention relates to a kind of liquid-crystal composition, specifically a kind of nematic phase liquid crystal composition, exactly institute of the present invention
The liquid-crystal composition of offer has big dielectric anisotropy, and more specifically liquid-crystal composition provided by the present invention has non-
The often fast response time.Belong to liquid crystal material and its application field.
Background technology
At present, liquid crystal is widely applied in field of information display, at the same the application in optical communication also achieve it is certain
Progress (S.T.Wu, D.K.Yang.Reflective Liquid Crystal Displays.Wiley, 2001).In recent years, liquid-crystalized
The application field of compound significantly widens kinds of displays part, electro-optical device, electronic component, sensor etc., nematic
Liquid-crystal compounds obtains most commonly used application in flat-panel monitor, particularly in the system of tft active matrix.
Liquid crystal display experienced very long road for development with the discovery of liquid crystal.Austrian botanist Friedrich in 1888
Reinitzer is found that the first liquid crystal material benzoic acid cholesterol (cholesteryl benzoate).Manguin hairs in 1917
Rubbing is understood, to make single domain liquid crystal and research optical anisotropy.E.Bose establishes moving within 1909
(Swarm) theory, and L.S.Ormstein and F.Zernike et al. experiment support (1918) are obtained, by De Gennes
It is discussed as statistical fluctuation.G.W.Oseen and H.Zocher founded continuum theory in 1933, and it is complete to obtain F.C.Frank
Kind (1958).M.Born (1916) and K.Lichtennecker (nineteen twenty-six) find and have studied liquid crystal dielectric it is each
Anisotropy.1932, nematic phase was divided into the positive and negative major class of property two by W.Kast accordingly.Nineteen twenty-seven, V.Freedericksz and
V.Zolinao has found nematic liquid crystal under electric field or magnetic fields, deforms upon and there is (Freederichsz turns of voltage threshold
Become).This making for being found to be liquid crystal display provides foundation.
Nineteen sixty-eight RCA Corp. of U.S. R.Williams has found that nematic liquid crystal forms striped farmland under electric field action, and has light scattering
Phenomenon.With dynamic scattering display pattern is developed into and first liquid crystal display in the world is made in G.H.Heilmeir
(LCD).Early seventies, Helfrich and Schadt have invented TN principles, and people utilize TN photoelectric effect and integrated circuit
It is combined, is made display device (TN-LCD), is that wide prospect has been opened up in the application of liquid crystal.Since the seventies,
Due to the development of large scale integrated circuit and liquid crystal material, application of the liquid crystal in terms of display achieves breakthrough development,
1983~1985 years T.Scheffer et al. successively propose super-twist nematic (Super Twisred Nematic：STN) pattern
And active matrix (the Active matrix that P.Brody was proposed in 1972：AM) mode is used again.Traditional
TN-LCD technologies have developed into STN-LCD and TFT-LCD technologies, although STN number of scanning lines up to 768 rows more than,
It is the problems such as remaining response speed, visual angle and gray scale when the temperature increases, therefore large area, high information quantity, coloured silk
Color is shown uses Active Matrix LCD At mode mostly.TFT-LCD be widely used for direct viewing type TV, large-curtain projecting TV set,
Terminal is shown and some military instrument are shown, it is believed that TFT-LCD technologies have more wide application prospect.
Wherein " active matrix " includes two types：1st, the OMS on the silicon wafer as substrate (partly lead by metal oxide
Body) or other diodes.2nd, on the glass plate as substrate thin film transistor (TFT) (TFT).
Monocrystalline silicon limits display size as substrate material, because each several part display device even module assembled is in its junction
There are many problems.Thus, second of thin film transistor (TFT) is the promising active matrix type of tool, the photoelectric effect utilized
Typically TN effects.TFT includes compound semiconductor, such as Cdse, or the TFT based on polycrystalline or amorphous silicon.
At present, mobile device requires more and more higher, the lightening main flow as current product, mobile device for display performance
Cruising time annoying equipment manufacturer as a problem, for mobile device, the energy that display is consumed accounts for main portion
Point, so the power consumption for how reducing liquid crystal display turns into the target of new generation product, the driving voltage of liquid crystal depends on liquid crystal
Dielectric anisotropy (Δ ε), dielectric anisotropy is bigger, and driving voltage is smaller.But as dielectric anisotropy increases,
The response time of liquid crystal display is more and more slower, influences display effect, specifically, the response type of liquid crystal display, which is shown in, to be depended on
The rotary viscosity of liquid crystal, rotary viscosity is lower, and the response time is faster.
Liquid-crystal composition proposed by the invention has big dielectric anisotropy and low rotary viscosity, efficiently solves low
The problem of voltage driving and response time.
The content of the invention
In order to overcome the defect of prior art, the present invention provides a kind of big dielectric anisotropy liquid crystal composition.
Specifically, the liquid-crystal composition includes the compound representated by least one formula I.The formula I that the present invention is provided
Representative compound is containing 2- methyl -3,4,5- trifluoro-benzenes structure and the polar compound of difluoro-methoxy bridged bond, structure tool
There is big dielectric anisotropy.In the liquid-crystal composition that the present invention is provided, each liquid crystal components sum is 100%；Change described in formula I
The content of compound in the composition be 20%~50%, preferably 25%~45%, more preferably 27%~43%, 27%~42%,
36%~42%, 27%~39% or 39%~43%.
The formula I is specially：
In the formula I, R1Represent C1~C12Straight chained alkyl, wherein one or more non-conterminous CH2Can by O, S or
CH=CH is replaced；
N represents 0 or 1；
L1For H or F；
Ring A is represented：
Preferably, the compound representated by formula I is selected from the one or more of the compound representated by formula IA~IG：
In the formula IA~IG, R1Represent C1~C7Straight chained alkyl.
It is further preferred that the compound representated by formula I is selected from the one or more of the compound representated by formula IA1~IG4：
It is highly preferred that compound representated by formula I of the present invention be selected from IA1, IA2, IB2, IB3, IC1, IC2, ID1,
One or more in ID2, IE2, IE3.
Liquid-crystal composition of the present invention is simultaneously comprising the compound representated by least one formula II；The formula II that the present invention is provided
Representative compound twin nuclei, the structure has low rotary viscosity.In the liquid-crystal composition that the present invention is provided, each liquid
Brilliant component sum is 100%；The content of compound in the composition described in formula II is 30%~60%, preferably 35%~55%,
More preferably 40%~54%, 43%~47%, 40%~54%, 40%~47% or 42%~52%.
The formula II is specially：
In the formula II, R2、R3C is represented independently of one another1~C12Straight chained alkyl, wherein one or more non-conterminous CH2
It can be replaced by O, S or CH=CH；Ring B, ring C represent trans 1,4- cyclohexyl or 1,4- phenylenes independently of one another.
Preferably, the compound representated by the formula II is selected from the one or more of formula IIA~compound shown in IIC：
In the formula IIA~IIC, R2Represent C1~C7Straight chained alkyl；R3Represent C1~C7Straight chained alkyl, unbranched alkoxy
Or C2~C7Straight-chain alkenyl.
It is further preferred that the compound representated by formula II is selected from one kind or several of the compound representated by Formula II A1~IIC24
Kind：
It is highly preferred that one or both of compound preferred IIA1, IIA2 representated by formula II provided by the present invention.
The liquid-crystal composition is simultaneously comprising the compound representated by least one general formula III, and the compound representated by general formula III is
Nonpolar tricyclic compound, such monomer has high clearing point and big elastic constant, is conducive to improving liquid-crystal composition
Elastic constant.In the liquid-crystal composition that the present invention is provided, each liquid crystal components sum is 100%；Compound is in group described in general formula III
Content in compound is 1%~35%, preferably 1%~30%, more preferably 2%~25%, more preferably 3%~19%,
15%~17%, 11%~19%, 11%~13% or 3%~17%.
The general formula III is specially：
In the general formula III, R4Represent C1~C12Straight chained alkyl or C2~C12Straight-chain alkenyl, R5Represent C1~C12Straight chain alkane
Base；Ring D represents trans 1,4- cyclohexyl or 1,4- phenylenes.
Preferably, the compound representated by general formula III is selected from the one or more of the compound representated by general formula III A~IIIB：
In the general formula III A~IIIB, R4Represent C2~C7Straight chained alkyl or straight-chain alkenyl；R5Represent C1~C7Straight chain
Alkyl.
It is further preferred that one kind in general formula III A1~compound shown in IIIB20 of compound representated by general formula III or
It is a variety of：
It is highly preferred that compound representated by general formula III be selected from formula III A1, IIIA2, IIIA8, IIIA12, IIIA16, IIIB3,
One or more in IIIB12, IIIB16.
Liquid-crystal composition provided by the present invention can be further comprising the compound representated by one or more formula IV.This hair
Compound representated by the formula IV of bright offer is fluoro terphenyl structure, with big optical anisotropy and stronger polarity.
In the liquid-crystal composition that the present invention is provided, each liquid crystal components sum is 100%；Compound described in formula IV containing in the composition
Measure as 0%~20%, preferably 0%~15%, more preferably 0%~10%, more preferably 3%~10% or 3%~6%.
The formula IV is specially：
In the formula IV, R6Represent C1~C12Straight chained alkyl or C2~C12Straight-chain alkenyl.
Preferably, the compound representated by formula IV is selected from the one or more of formula IVA~compound shown in IVB：
In shown formula IVA, R6Represent C2~C7Straight chained alkyl；In the formula IVB, K represents H or CH3。
It is further preferred that one or more of the compound in formula IVA1~IVB2 representated by formula IV：
It is highly preferred that one or more of the compound in formula IV A1, IVA2, IVB1 representated by formula IV.
Liquid-crystal composition provided by the present invention can be further comprising the compound representated by one or more formula V.The present invention
The compound representated by formula V provided is Fourth Ring neutral compound, with very high clearing point and larger optics it is each to
The opposite sex.In the liquid-crystal composition that the present invention is provided, each liquid crystal components sum is 100%；Compound is in composition described in formula V
In content be 0%~20%, preferably 0%~15%, more preferably 0%~9%, more preferably 1%~9% or 3%~4%.
The formula V is specially：
In the formula V, R7、R8C is represented independently of one another1~C12Straight chained alkyl；L2Represent H or F.
Preferably, one or more of the compound representated by formula V in formula VA~compound shown in VB：
In the formula VA~VB, R7、R8C is represented independently of one another1~C7Straight chained alkyl.
It is further preferred that one or more of the compound in Formula V A1~VB16 representated by formula V：
It is highly preferred that the compound that formula V is represented is selected from one or both of VA5 or VB6.
In order to realize low driving voltage and fast response time, liquid-crystal composition of the invention, by weight percentage, including
Following components：
(1) compound representated by 20-50% formulas I；
(2) compound representated by 30-60% formulas II；
Compound representated by (3) 1~35% general formula IIIs.
Specifically, in order that liquid-crystal composition meets different demands, liquid-crystal composition provided by the present invention includes following
Weight percent composition：
Compound representated by (1) 20%~50% one or more formula I；
Compound representated by (2) 30%~60% one or more formula II；
Compound representated by (3) 1%~30% one or more general formula IIIs；
Compound representated by (4) 0%~20% one or more formula IV；
Compound representated by (5) 0%~20% one or more formula V；
Preferably, liquid-crystal composition provided by the present invention includes following components in percentage by weight：
Compound representated by (1) 25%~45% one or more formula I；
Compound representated by (2) 35%~55% one or more formula II；
Compound representated by (3) 2%~25% one or more general formula IIIs；
Compound representated by (4) 0%~15% one or more formula IV；
Compound representated by (5) 0%~15% one or more formula V.
It is highly preferred that liquid-crystal composition provided by the present invention includes following components in percentage by weight：
Compound representated by (1) 27%~43% one or more formula I；
Compound representated by (2) 40%~54% one or more formula II；
Compound representated by (3) 3%~19% one or more general formula IIIs；
Compound representated by (4) 0%~10% one or more formula IV；
Compound representated by (5) 0%~9% one or more formula V.
The preferably liquid-crystal composition of the invention includes following weight percent composition：
Compound representated by (1) 36%~42% one or more formula I；
Compound representated by (2) 43%~47% one or more formula II；
Compound representated by (3) 15%~17% one or more general formula IIIs；
Or：
Compound representated by (1) 27%~39% one or more formula I；
Compound representated by (2) 40%~54% one or more formula II；
Compound representated by (3) 11%~19% one or more general formula IIIs；
Compound representated by (4) 3%~10% one or more formula IV；
Or：
Compound representated by (1) 39%~43% one or more formula I；
Compound representated by (2) 40%~47% one or more formula II；
Compound representated by (3) 11%~13% one or more general formula IIIs；
Compound representated by (4) 3%~4% one or more formula V；
Or：
Compound representated by (1) 27%~42% one or more formula I；
Compound representated by (2) 42%~52% one or more formula II；
Compound representated by (3) 3%~17% one or more general formula IIIs；
Compound representated by (4) 3%~6% one or more formula IV；
Compound representated by (5) 1%~9% one or more formula V.
In the preferably liquid-crystal composition of the invention, each component consumption sum is 100%.
As a preferred embodiment of the present invention, the liquid-crystal composition includes following components in percentage by weight：
As a preferred embodiment of the present invention, the liquid-crystal composition includes following components in percentage by weight：
As a preferred embodiment of the present invention, the liquid-crystal composition includes following components in percentage by weight：
Compound representated by liquid-crystal composition formula of I provided by the present invention is to contain 2- methyl -3,4,5- trifluoro-benzenes and difluoro
The connected compound of methoxyl group bridged bond, such compound has strong polarity and good intersolubility feature, and second introduces first
The intersolubility feature of such compound can be effectively improved after base, it is surprising that compound I provided by the present invention with
Not methylic compound phase ratio, the amplitude that its intersolubility improves is more than 30%, and is more beneficial for improving the low temperature of mixed liquid crystal
Intersolubility feature；Compound representated by formula II is twin nuclei, with low rotary viscosity and excellent intersolubility feature,
It is the essential component of fast-response liquid crystal display；Compound representated by general formula III is nonpolar tricyclic compound, such list
Body has high clearing point and big elastic constant, is conducive to improving the elastic constant of liquid-crystal composition；Representated by formula IV
Compound is fluoro terphenyl structure, with big optical anisotropy and stronger polarity；Compound representated by formula V is
Tetracyclic structure, such compound has very high clearing point and larger optical anisotropy.
The preparation method of liquid-crystal composition of the present invention can use conventional method by two or more compounds without specifically limited
Mixing is produced, such as by mixing different component at high temperature and method soluble in one another preparation, wherein, by liquid crystal combination
Thing is dissolved in the solvent for the compound and mixed, and the solvent is then distilled out under reduced pressure；Or liquid of the present invention
Crystal composite can be prepared conventionally, such as will wherein the less component of content be dissolved at a higher temperature content compared with
In big key component, or each affiliated component dissolved in organic solvent, such as acetone, chloroform or methanol then will be molten
Liquid mixing is obtained after removing solvent.
Liquid-crystal composition of the present invention has low rotary viscosity, big elastic constant, good low temperature intersolubility and fast
Response speed, available for the fast-response liquid crystal display of plurality of display modes, it is in TN, IPS or FFS mode display
Use can be obviously improved liquid crystal display display effect.
Embodiment
Following examples are used to illustrate the present invention, but are not limited to the scope of the present invention.
Unless otherwise indicated, percentage is weight percentage in the present invention；Temperature unit for degree Celsius；△ n represent optics it is each to
Different in nature (25 DEG C)；ε∥And ε⊥Parallel and vertical dielectric constant (25 DEG C, 1000Hz) is represented respectively；It is each to different that △ ε represent dielectric
Property (25 DEG C, 1000Hz)；γ 1 represents rotary viscosity (mPa.s, 25 DEG C)；Cp represents the clearing point (DEG C) of liquid-crystal composition；
K11、K22、K33Splay, distortion and bend elastic constant (pN, 25 DEG C) are represented respectively.
In following embodiment, unit structure is represented with code shown in table 1 in liquid-crystal compounds.
Table 1：The group structure code of liquid-crystal compounds
By taking following compound structure as an example：
It is expressed as：4CDUQKF
It is expressed as：5CCPUF
In following embodiment, the preparation of liquid-crystal composition uses heat of solution method, comprises the following steps：With balance by weight
Measure percentage and weigh liquid-crystal compounds, wherein weigh addition sequence without particular requirement, generally with liquid-crystal compounds fusing point by height to
Low order weighs mixing successively, and heating stirring causes each component to melt uniformly at 60~100 DEG C, then through filtering, revolving,
Finally encapsulation produces target sample.
In following embodiment, the performance parameter of the weight percent of each component when liquid-crystal composition is seen below in liquid-crystal composition
Form.
Embodiment 1
Table 2：The weight percent of each component when performance parameter in liquid-crystal composition
Embodiment 2
Table 3：The weight percent of each component when performance parameter in liquid-crystal composition
Embodiment 3
Table 4：The weight percent of each component when performance parameter in liquid-crystal composition
Embodiment 4
Table 5：The weight percent of each component when performance parameter in liquid-crystal composition
Embodiment 5
Table 6：The weight percent of each component when performance parameter in liquid-crystal composition
Embodiment 6
Table 7：The weight percent of each component when performance parameter in liquid-crystal composition
Embodiment 7
Table 8：The weight percent of each component when performance parameter in liquid-crystal composition
Embodiment 8
Table 9：The weight percent of each component when performance parameter in liquid-crystal composition
Embodiment 9
Table 10：The weight percent of each component when performance parameter in liquid-crystal composition
Embodiment 10
Table 11：The weight percent of each component when performance parameter in liquid-crystal composition
Embodiment 11
Table 12：The weight percent of each component when performance parameter in liquid-crystal composition
Embodiment 12
Table 13：The weight percent of each component when performance parameter in liquid-crystal composition
Embodiment 13
Table 14：The weight percent of each component when performance parameter in liquid-crystal composition
Embodiment 14
Table 15：The weight percent of each component when performance parameter in liquid-crystal composition
Embodiment 15
Table 16：The weight percent of each component when performance parameter in liquid-crystal composition
Embodiment 16
Table 17：The weight percent of each component when performance parameter in liquid-crystal composition
Comparative example 1
Table 18：The weight percent of each component when performance parameter in liquid-crystal composition
Embodiment 6 collect being compared with each performance parameter value of the gained liquid-crystal composition of comparative example 1, referring to table 19.
Table 19：The performance parameter of liquid-crystal composition compares
| Δn | △ε | Cp | γ1 | K11 | K22 | K33 | |
| Embodiment 6 | 0.101 | +12.1 | 80 | 82 | 11.2 | 5.6 | 14.4 |
| Comparative example 1 | 0.101 | +12.0 | 80 | 85 | 10.4 | 5.2 | 14.6 |
Understood through comparing：Compared with comparative example 1, the liquid-crystal composition that embodiment 6 is provided has low rotary viscosity and big
Elastic constant, i.e., with the faster response time.
In addition, the stability of comparative example 6 and comparative example 1, test data is shown in Table 20：
Table 20：The Reliability comparotive of liquid-crystal composition
Note：Test temperature is 60 ± 1 DEG C
Understood through comparing：Compared with comparative example 1, the liquid-crystal composition that embodiment 6 is provided has high voltage retention and low
Ion concentration, especially with good photostability and heat endurance, lifted liquid crystal display display quality and the life-span.
As seen from the above embodiment, liquid-crystal composition provided by the present invention has big dielectric to anisotropy, low viscosity, height
Voltage retention, low ion concentration, suitable optical anisotropy, good low temperature intersolubility, big elastic constant with
And excellent photostability and heat endurance, it is possible to decrease the driving voltage of liquid crystal display, so as to solve the continuation of the journey of mobile device
Problem.Therefore, liquid-crystal composition provided by the present invention is applied to TN, IPS and FFS type TFT liquid crystal display devices,
Be particularly suitable for use in IPS and FFS liquid crystal display devices, is particularly suitable for use in the liquid crystal display device of Notebook class mobile devices.
Although above the present invention is described in detail with a general description of the specific embodiments, in this hair
On the basis of bright, it can be made some modifications or improvements, this will be apparent to those skilled in the art.Therefore,
These modifications or improvements, belong to the scope of protection of present invention without departing from theon the basis of the spirit of the present invention.
Claims (10)
1. one kind has big dielectric anisotropy liquid crystal composition, it is characterised in that the liquid-crystal composition bag
Compound, the compound of at least one formula II representatives and at least one formula represented containing at least one formula I
The compound that III is represented；
The formula I is specially：
In the formula I, R1Represent C1~C12Straight chained alkyl, wherein one or more non-conterminous CH2Can be with
Replaced by O, S or CH=CH；
N represents 0 or 1；
L1For H or F；
Ring A is represented：
The formula II is specially：
In the formula II, R2、R3C is represented independently of one another1~C12Straight chained alkyl, one of them or it is many
Individual non-conterminous CH2It can be replaced by O, S or CH=CH；Ring B, ring C are represented instead independently of one another
Formula 1,4- cyclohexyl or 1,4- phenylenes；
The general formula III is specially：
In the general formula III, R4Represent C1~C12Straight chained alkyl or C2~C12Straight-chain alkenyl, R5Represent
C1~C12Straight chained alkyl；Ring D represents trans 1,4- cyclohexyl or 1,4- phenylenes.
2. liquid-crystal composition according to claim 1, it is characterised in that the chemical combination representated by formula I
Thing is selected from the one or more of the compound representated by formula IA~IG：
In the formula IA~IG, R1Represent C1~C7Straight chained alkyl；
Preferably, the compound representated by formula I is selected from one kind or several of the compound representated by formula IA1~IG4
Kind：
It is highly preferred that compound representated by formula I be selected from IA1, IA2, IB2, IB3, IC1, IC2, ID1,
One or more in ID2, IE2, IE3.
3. liquid-crystal composition according to claim 1 or 2, it is characterised in that representated by the formula II
Compound be selected from formula IIA~compound shown in IIC one or more：
In the formula IIA~IIC, R2Represent C1~C7Straight chained alkyl；R3Represent C1~C7Straight chained alkyl,
Unbranched alkoxy or C2~C7Straight-chain alkenyl；
Preferably, the compound representated by formula II be selected from Formula II A1~IIC24 representated by compound one kind or
It is several：
It is highly preferred that one or both of compound preferred IIA1, IIA2 representated by formula II.
4. the liquid-crystal composition according to claims 1 to 3 any one, it is characterised in that general formula III institute's generation
The compound of table is selected from the one or more of the compound representated by general formula III A~IIIB：
In the general formula III A~IIIB, R4Represent C2~C7Straight chained alkyl or straight-chain alkenyl；R5Represent C1~C7
Straight chained alkyl；
Preferably, the one kind of compound representated by general formula III in general formula III A1~compound shown in IIIB20
Or it is a variety of：
It is highly preferred that compound representated by general formula III be selected from formula III A1, IIIA2, IIIA8, IIIA12, IIIA16,
One or more in IIIB3, IIIB12, IIIB16.
5. the liquid-crystal composition according to Claims 1 to 4 any one, it is characterised in that the liquid crystal
The compound of at least one Formula IVIV is also included in composition；
The formula IV is specially：
In the formula IV, R6Represent C1~C12Straight chained alkyl or C2~C12Straight-chain alkenyl；
Preferably, the compound representated by formula IV is selected from formula IVA~one kind of compound or many shown in IVB
Kind：
In shown formula IVA, R6Represent C2~C7Straight chained alkyl；
In the formula IVB, K represents H or CH3；
It is further preferred that the one kind or many of compound in formula IVA1~IVB2 representated by formula IV
Kind：
It is highly preferred that one kind in formula IV A1, IVA2, IVB1 of the compound representated by formula IV or
It is a variety of.
6. the liquid-crystal composition according to Claims 1 to 5 any one, it is characterised in that the liquid crystal
The compound also represented in composition comprising at least one formula V；
The formula V is specially：
In the formula V, R7、R8C is represented independently of one another1~C12Straight chained alkyl；L2Represent H or F；
Preferably, the one kind or many of the compound representated by formula V in formula VA~compound shown in VB
Kind：
In the formula VA~VB, R7、R8C is represented independently of one another1~C7Straight chained alkyl；
It is further preferred that one or more of the compound in Formula V A1~VB16 representated by formula V：
It is highly preferred that the compound that formula V is represented is selected from one or both of VA5 or VB6.
7. the liquid-crystal composition according to claim 1~6 any one, it is characterised in that the liquid crystal
Composition includes following components in percentage by weight：
Compound representated by (1) 20%~50% one or more formula I；
Compound representated by (2) 30%~60% one or more formula II；
Compound representated by (3) 1%~35% one or more general formula IIIs；
Preferably, the liquid-crystal composition includes following components in percentage by weight：
Compound representated by (1) 20%~50% one or more formula I；
Compound representated by (2) 30%~60% one or more formula II；
Compound representated by (3) 1%~30% one or more general formula IIIs；
Compound representated by (4) 0%~20% one or more formula IV；
Compound representated by (5) 0%~20% one or more formula V；
It is further preferred that the liquid-crystal composition includes following components in percentage by weight：
Compound representated by (1) 25%~45% one or more formula I；
Compound representated by (2) 35%~55% one or more formula II；
Compound representated by (3) 2%~25% one or more general formula IIIs；
Compound representated by (4) 0%~15% one or more formula IV；
Compound representated by (5) 0%~15% one or more formula V；
It is highly preferred that the liquid-crystal composition includes following components in percentage by weight：
Compound representated by (1) 27%~43% one or more formula I；
Compound representated by (2) 40%~54% one or more formula II；
Compound representated by (3) 3%~19% one or more general formula IIIs；
Compound representated by (4) 0%~10% one or more formula IV；
Compound representated by (5) 0%~9% one or more formula V.
8. the liquid-crystal composition according to claim 1~6 any one, it is characterised in that the liquid crystal
Composition includes following components in percentage by weight：
Compound representated by (1) 36%~42% one or more formula I；
Compound representated by (2) 43%~47% one or more formula II；
Compound representated by (3) 15%~17% one or more general formula IIIs；
Or include following components in percentage by weight：
Compound representated by (1) 27%~39% one or more formula I；
Compound representated by (2) 40%~54% one or more formula II；
Compound representated by (3) 11%~19% one or more general formula IIIs；
Compound representated by (4) 3%~10% one or more formula IV；
Or include following components in percentage by weight：
Compound representated by (1) 39%~43% one or more formula I；
Compound representated by (2) 40%~47% one or more formula II；
Compound representated by (3) 11%~13% one or more general formula IIIs；
Compound representated by (4) 3%~4% one or more formula V；
Or include following components in percentage by weight：
Compound representated by (1) 27%~42% one or more formula I；
Compound representated by (2) 42%~52% one or more formula II；
Compound representated by (3) 3%~17% one or more general formula IIIs；
Compound representated by (4) 3%~6% one or more formula IV；
Compound representated by (5) 1%~9% one or more formula V；
It is preferred that each component consumption sum is 100% in the liquid-crystal composition.
9. a kind of big dielectric anisotropy liquid crystal composition, it is characterised in that include following percentage by weight
Composition：
Or, include following components in percentage by weight：
Or, include following components in percentage by weight：
10. application of the liquid-crystal composition described in claim 1~9 any one in liquid crystal display device, excellent
The application in TN, IPS, FFS or TFT liquid crystal display device is elected as, more preferably in IPS or FFS
Application in liquid crystal display device.
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