CN105295956A - Positive dielectric liquid crystal composition - Google Patents

Abstract

The invention discloses a positive dielectric liquid crystal composition. The positive dielectric liquid crystal composition comprises a component A which consists of one or more liquid crystal compounds shown in a general formula I, and an additive component D which consists of one or more compounds shown in a general formula S-1, a structural formula S-2, a structural formula S-3 and a general formula S-4. The positive dielectric liquid crystal composition does not change under the conditions of high temperature and ultraviolet radiation, so that the liquid crystal quality is improved; the positive dielectric liquid crystal composition is applicable to an active matrix electric optical element and a liquid crystal display, and can be applied to civil use and practical TFT-LCDs (Thin-Film Transistor Liquid Crystal Displays) under special severe conditions.

Description

- specific positive dielectric liquid crystal composition

FIELD

[0001] The field of the present invention and the liquid crystal material is provided, in particular a positive liquid crystal composition.

Background technique

[0002] The liquid crystal display element according to the display mode is divided into the following modes: twisted nematic (TN) mode, super twisted nematic (STN) mode, a coplanar mode (the IPS), vertical alignment (VA) mode. Are required regardless of the display mode of the liquid crystal composition have the characteristic W.

[000 Primer (1) chemical and physical stability properties.

[0004] The low viscosity like.

[000 lead (3) having a suitable Ae.

[0006] (4) suitable reflectance demolition An.

[0007] (5) compatibility with other liquid crystal compounds is good

[0008] With the maturation early nineties TFT technology, the rapid development of the color liquid crystal flat panel displays, less than 10 years, TFT-LCD display rapid growth of the mainstream, and it has the advantage that transport is inseparable. The advantage is divided into five points:

[0009] - good usage characteristics. Application of low voltage, low driving voltage; flat-panel, and very thin, saving a lot of raw materials and the use of space; low power consumption; display quality from the most simple monochrome character pattern to a high resolution, high color fidelity, high brightness, high contrast, various models of high response speed of a video display; display mode has a variety of direct-view display, projection, perspective and reflective like.

[0010] two good environmental characteristics. TFT-LCD no blessing shoot, no flicker, no harm to the health of users, especially the emergence of TFT-LCD e-books, will mankind into a paperless office, paperless printing times, lead to human learning, communication, and remember planted revolution civilized way.

[0011] S broad scope of application: from -20 ° c to a temperature in the range of 50 ° C can be used normally W, the temperature after the TFT-LCD reinforcement low working temperature can reach minus 80 ° C. As the mobile terminal can display a desktop terminal display, but also for large-screen projection TV W, excellent performance is the full-size video display terminal.

[0012] four high degree of automated manufacturing technology.

[0013] V. TFT-LCD easy integration and replacement.

[0014] The main features of the liquid crystal panel display, so the quality characteristics of the liquid crystal material used in liquid crystal flat panel display also requires a higher liquid crystal composition itself should have a high charge holding ratio, high resistivity, low ion concentration, low power, low rotational viscosity.

[0015] As the liquid crystal material is required to have good chemical and thermal stability and W Four electric and electromagnetic emission stability. As a thin film transistor technology (TFT-LCD) with liquid crystal material is required to have not only the above stability, but also have a wider temperature range of a nematic phase, a suitable birefringence anisotropy, a very high resistivity, good UV resistance, high charge holding ratio W, and low vapor pressure properties.

[0016] The thin film transistor technology (TFT-LCD) applications, although in recent years, the market has been very great, mature technology, the same time, since the liquid crystal material technology continues to progress, it requires the display technology is constantly improved, especially in terms of fast response, reduce the driving voltage W to reduce power consumption.

[0017] The liquid crystal material is a liquid crystal display as one of the important optoelectronic material, to improve the performance of liquid crystal displays play an important role. Any liquid crystal composition for display are required to have a broad liquid crystalline temperature, high stability, more suitable viscosity, the electric field has a faster response speed. However, so far no single crystal material in liquid crystal displays used alone, without the development of other performance characteristics of the compositions can meet the performance requirements. Therefore, to develop new high performance liquid crystal material is of great significance for the development of a liquid crystal display. Liquid crystal during use, will continue to be affected by heat and light W emitted fu-fu emitted, while it is inevitably subject to light and heat in the production process of the contact, the contact is not the kind of operation will cause the liquid crystal molecules in terms of impurities the change, which affects the change in liquid crystal wrong given ability, thereby affecting the display panel, though rapid panel technology, OL Di than the LCD has outstanding advantages in transportation aspect, the present invention is directed to a liquid crystal being in manufacturing production W and use Effects of W light and heat, corresponding solutions proposed, after the experiment show that, by improving its degree of reliability dramatically, W may be subjected to the liquid crystal material to avoid the adverse effect upon contact with high-temperature and different wavelengths W

SUMMARY

[0018] The present invention is a technical problem to be solved is to provide a positive dielectric liquid crystal composition, in the case where W subjected to elevated temperatures and UV-fu emitted itself does not change, so as to enhance the quality of the liquid crystal, for active-matrix and a liquid crystal electro-optical display element, can be used under harsh conditions and special civil W practical TFT-LCD.

[0019] To solve the above technical problem, the technical solution employed in the present invention:

[0020] - specific positive dielectric liquid crystal composition, the liquid crystal composition comprising a liquid crystal component A one or several compounds of formula I as composition, comprising one or more of the general formula II shown in the liquid crystal component B composed of compounds containing one or more of the general formula III shown in the liquid crystal component C composed of compounds, further comprising one or more of the general formula S-1, of formula S-2, S-3 of formula , a compound of formula S-4 additive component consisting of D,

[0021]

[Wherein lead 002,

[0023] Cut CleaA ^ is selected from cyclopentyl, the group, cyclopropyl ring of any one,

[0024] Ri is selected from the following ①, ②, ③, any one of the groups shown in ④,

[00 clever] ①H, C1, F, CN, 0CN, OCF3, CFs, CHFz, CHzF, OCHFz, SCN, NCS, SFs,

[0026] ② carbon atoms, a straight-chain alkyl group having a carbon number of I ~ I ~ 15 linear alkoxy group, carbon atoms or a group association 2 to 15 carbon atoms, a straight-chain having 2 to 15 linear associative group 15,

[0027] ③ ② above one or more - (¾- W each independently may be substituted with -CH = Di -, - (: tris (: -, - square) 0 -, - 00 (: - the ring burn, burn cyclopentyl, alternatively -0- or -5- ^ group and instead form the oxygen atoms are not directly connected to be formed,

[0028] ④ ② one or more of the above-described at least one independently H by F, Cl substituted formed radicals;

[002 Primer 1? 2,33,35,36 number of carbon atoms independently selected from Mountain linear alkyl group having 1 to 10 carbon atoms, a straight-chain alkyl group having 1 to 10 carbon atoms is 2 to 10 or a straight-chain associative group having 3 to 8 carbon atoms, straight-chain associative group, any of which H may be substituted with F;

[0030] Ra is selected from

Carbon atoms, a straight-chain alkyl group having 1 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms, a straight-chain linear to any one associative group of 2 to 10;

[Cited 00] Xi, X2, X3, X4 are independently selected from H, F, any one of;

[0032] Yi selected from F, carbon atoms, straight-chain alkyl group having 1 to 6, or a linear alkoxy group having carbon atoms any one of linear associative group of 2 to 6, wherein H is not F is unsubstituted or mono-substituted or multi-substituted with F;

[0033] Zi, Zz are independently selected from a single bond, -CH2 _, - Di Di 2- 2 -, - (Di 2) ​​plant, - (Di 2) ​​wide, -CH = CH -, - C three C -, - C 00 -, - 00C -, - CFzO -, - 0 _ 2 Di - Di 2〇 -, - OCFz -, - CF2CH2 -, - CH2CF2 -, - CzF wide or -CF = CF- any one of;

[0034] Zs is selected from a single bond, -CH plant, - Di Di 2- 2 -, - (Di 2) ​​plant, - (Di 2) ​​wide, -CH = CH -, - C three C -, - COO- , -00 C -, - 0 Di 2 -, - Di 2〇 -, - CF2CH2 -, - CH2CF2 -, - CzF wide or -CF = CF- any one of;

[003 Cited

Selected from the following (A), any one of the groups represented),

[0037] (a) trans-1,4-cyclohexylene group, 1,4-cyclohexanediol associative group, wherein one or more non-adjacent -CH plant group is -0- or -S- or replaced;

[0038] of) 1,4-phenylene radical, in which one or two -CH- substituted or unsubstituted N, substituted with one or two F is H or unsubstituted;

[0039] a, b, d respectively denote not 0,1,2,3, C no Table 1 or 2, e is not 0, 1 table, and a + b + c "5.

[0040] Further aspect of the present invention is improved in that: the liquid crystal composition, the weight percentage of component A is 1 to 50%, weight percent of component B is 1 to 70%, Component C the weight percentage of about 0 to 40%, component a, component B, component C content of the sum of two hundred to 100%.

[0041] Preferably, the liquid crystal composition, the weight percentage of component A is from 5 to 50%, weight percent of component B is 10 to 70%, the weight percentage of component C is 5 to 40%, component a, component B, component C content of the sum of two hundred to 100%.

[0042] Further preferably, the liquid crystal composition, the weight percentage of the component A is 15 to 45%, weight percent of component B is 20 to 60% by weight percentage of component C 15 to 35%, component a, component B, component C in the percentage is 100%.

[0043] Further aspect of the present invention is improved in that: the content of the liquid crystal composition of the additive component D is 1 to 3000ppm〇

[0044] Preferably, the content of the liquid crystal composition additive component D is 1 ~ lOOOppm.

[0045] Further preferably, the content of the liquid crystal composition component D of 1 to 50 pm.

[0046] and most preferably 1 ~ 200ppm.

Further improved [0047] This aspect of the present invention in that: said liquid crystal composition is added at a weight percent of 0.0% to 0.5% of active component.

[0048] Further aspect of the present invention is improved in that: the compound of formula I as illustrated in the following specific formulas II ~ Formula 1-3,

[0050] wherein,

[0051] Ri is selected from the following ①, ②, ③, any one of the groups shown in ④,

[0052] ①H, C1, F, CN, 0CN, OCF3, CFs, CHFz, CHzF, OCHFz, SCN, NCS, SFs,

[0053] ② carbon atoms, a straight-chain alkyl group having a carbon number of I ~ I ~ 15 linear alkoxy group, carbon atoms or a group association 2 to 15 carbon atoms, a straight-chain having 2 to 15 linear associative group 15,

[0054] ③ ② above one or more - (¾- W each independently may be substituted with -CH = CH -, - CS〇, -〇) 0 -, - 00 (: - burning the ring, cyclopentyl, burning, form a group -0- or -5- ^ and instead replace the oxygen atoms are not directly connected to be formed,

[00 Qiao] ② ④ above one or more H are each independently F, Cl substituent at least one group is formed;

[0056] Xi, Xz are independently selected from any one of H, F in;

[0057] Zi, Zz are independently selected from a single bond, -CH2 _, - Di Di 2- 2 -, - (Di 2) ​​3 _, - (Di 2) ​​4 _, - CH = CH -, - C three C -, - C 00 -, - 00C -, - CFzO -, - 0 _ 2 Di - Di 2〇 -, - OCFz -, - CF2CH2 -, - CH2CF2 -, - CzF wide or -CF = CF- any one of;

Any one of the groups;

[0059] a, b respectively represent 0,1,2,3, C represents 1 or 2, and a + b + c "5.

[0060] Further aspect of the present invention is improved in that: the compound of Formula I as illustrated in the following specific compounds of formula I-1-a ~ of formula I-3-t,

[Wherein lead 006,

[0069] Ri is selected from the following ①, ②, ③, any one of the groups shown in ④,

[0070] ①H, C1, F, CN, 0CN, OCF3, CFs, CHFz, CHzF, OCHFz, SCN, NCS, SFs,

[0071] ② carbon atoms, a straight-chain alkyl group having a carbon number of I ~ I ~ 15 linear alkoxy group, carbon atoms or a group association 2 to 15 carbon atoms, a straight-chain having 2 to 15 linear associative group 15,

[0072] ③ ② above one or more - (¾- W each independently may be substituted with -CH = Di -, - (: tris (: -, - square) 0 -, - 00 (: - the ring burn, burn cyclopentyl, alternatively -0- or -5- ^ group and instead form the oxygen atoms are not directly connected to be formed,

[0073] ④ ② one or more of the above-described at least one independently H by F, Cl substituted formed radicals;

[0074] (Qiao represents any one of H or F;

[Cited 007 (0) represents 0 or - any one of Di 2-.

[0076] Preferably, the compound of the general formula I as specifically shown in the following formula I-1-al ~ of formula I-3-t-6,

[0077]

Further improved [0095] This aspect of the invention, wherein: the compound is a compound represented by Formula II specifically the following formula II-a ~ of formula II-i,

[0097] wherein,

[009 primer R2, R3 are independently selected from H, straight chain carbon atoms, alkyl group having 1 to 10 carbon atoms, a linear burn group having 1 to 10 carbon atoms, a straight-chain associative group having 2 to 10 or having 3 to 8 carbon atoms, straight-chain associative group, any of which H may be substituted with F;

[0099] (Qiao represents any one of H or F.

[0100] Preferably, the compound represented by the general formula II is represented by the following formula particular II-a-1 ~ of formula II-i-3,

[0103] Further aspect of the present invention is improved in that: the compound represented by the general formula III as shown in the following specific formula III-a ~ of formula III-U,

[0104]

[0114] wherein,

[0115] Ra is selected from

Carbon atoms, a straight-chain alkyl group having 1 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms, a straight-chain linear to any one associative group having 2 to 10 in.

[0116] The present invention also discloses a positive dielectric above liquid crystal composition is applied to the liquid crystal display element and a liquid crystal display.

[0117] By adopting the technical solution of the present invention, technological advances are made:

[0118] A according to the present invention, the positive dielectric liquid crystal composition having a high charge holding ratio, low power consumption, low rotational viscosity, fast response time, suitable for the electro-optical element and active matrix liquid crystal display device, and in particular a twisted nematic (TN), in-plane switching (IP coincidence or a fringe field switching (FF clever type of display.

[0119] n is excellent in dielectric properties of liquid crystal composition provided by the present invention, can satisfy the high reliability requirements of W, having a stability against oxidation, and UV stability W high and low temperature stability. Also has a very low total response time, has a low voltage, high resistivity and voltage holding ratio. By adjusting the content of the individual components, according to the present invention, nematic liquid crystal composition W may have a different threshold voltage and birefringence, W may be made of various client systems commonly used to facilitate cell thickness at different and the use of different driving voltages. And the liquid crystal mixture still exhibits a high resistivity at high temperature, the liquid crystal mixture exhibits excellent high temperature and have excellent UV stability. Meanwhile, the liquid crystal mixture of the present invention also exhibit a low viscosity, fast response time, a suitable optical anisotropy and a suitable dielectric anisotropy, and thus can be an active matrix addressing electro-optical display.

[0120] positive dielectric liquid crystal composition of the present invention, W for an active matrix display, the thin film transistor through the lamp FT) matrix addressing preferred, particularly for active matrix TN-TFT fabrication of fast response, the IPS -TFT liquid crystal display element and a liquid crystal display, also belong to the scope of the present invention.

Detailed ways

[0121] The present invention discloses a positive dielectric liquid crystal composition, characterized in that: the liquid crystal composition comprises one or several liquid crystal compounds of formula I as component A, comprising one or component B shown several liquid crystal compounds of formula II, comprising one or more of the general formula III in the liquid crystal component C composed of compounds, further comprising one or more S-1, several structural formula of formula S-2,, the compound represented by the general formula of formula S-3 S-4 additive component consisting of D,

[0124] wherein,

[01 Qiao] cut CleaA ^ is selected from cyclopentyl, the group, any one of cyclopropyl,

[0126] Ri is selected from the following ①, ②, ③, any one of the groups shown in ④,

[0127] ①H, C1, F, CN, 0CN, OCF3, CFs, CHFz, CHzF, OCHFz, SCN, NCS, SFs,

[0128] ② carbon atoms, a straight-chain alkyl group having a carbon number of I ~ I ~ 15 linear alkoxy group, carbon atoms or a group association 2 to 15 carbon atoms, a straight-chain having 2 to 15 linear associative group 15,

[0129] ③ ② one or more of the above-described -CHz- W each independently may be substituted with -CH = CH -, - CS〇, -〇) 0 -, - 00 (: -, cycloalkyl lower burn, burn cyclopentyl after, alternatively -0- or -5- ^ group and instead form oxygen atoms are not directly connected to be formed,

[0130] ④ ② above one or more H are each independently by F, Cl substituted by at least one group is formed;? Male 131] 1 2,1 3,1 5,36 independently selected?? since the number of carbon atoms and Mount linear alkyl group having 1 to 10 carbon atoms, a straight-chain alkyl group having 1 to 10 carbon atoms, 2 to 10, or a linear associative group having 3 to 8 carbon atoms, straight-chain associative group, any of which H may be substituted with F;

[0132] Ra is selected from

Carbon atoms, a straight-chain alkyl group having 1 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms, a straight-chain linear to any one associative group of 2 to 10;

[013 cited Xi, X2, X3, X4 are independently selected from any one of H, F in;

[0134] Yi selected from F, carbon atoms, straight-chain alkyl group having 1 to 6, or a linear alkoxy group having carbon atoms any one of linear associative group of 2 to 6, wherein H is not F is unsubstituted or mono-substituted or multi-substituted with F;

[013 primers 21 and 22 are independently selected from a single bond, - Di 2 -, - 2- Di Di 2 -, - (Di 2) ​​3 -, - (Di 2) ​​wide - Di = Di -, - (: three (: -, - 0 00 -, - 00C -, - CFzO -, - 0 2 _ Di - Di 20 -, - OCFz -, - CF2CH2 -, - CH2CF2 -, - CzF in wide or -CF = CF- any one;

[0136] Zs is selected from a single bond, -CH2 _, - Di Di 2- 2 -, - (Di 2) ​​3 _, - (Di 2) ​​4 _, - CH = CH -, - C three C -, - C00-, -00C -, - 0 Di 2 -, - Di 2〇 -, - CF2CH2 -, - CH2CF2 -, - C2F4- or -CF = CF- any one of;

In any one of;

[0138]

Selected from the following (A), any one of the groups represented),

[01 test (a) trans-1,4-cyclohexylene group, 1,4-cyclohexanediol associative group, wherein one or more non-adjacent - Di-2-yl group is -0- or -S- substituted or unsubstituted;

[0140] of) 1,4-phenylene radical, in which one or two -CH- substituted or unsubstituted N, substituted with one or two F is H or unsubstituted;

[0141] a, b, d respectively denote not 0,1,2,3, C no Table 1 or 2, e is not 0, 1 table, and a + b + c "5. The present invention also discloses a liquid crystal composition, the weight percentage of component A is 1 to 50%, weight percent of component B is 1 to 70%, weight percent of component C is from 0 to 40 %, component a, component B, component C content of the two hundred up to 100%.

[0142] The present invention also discloses a liquid crystal composition, the content of Component D is 1 ~ 3000ppm.

[0143] The present invention also discloses a liquid crystal composition, further adding a weight percent of 0.0 - 0.5% of optically active components.

[0144] The liquid crystal composition of the present invention may employ two or more conventional methods for the production of liquid crystal compounds are mixed and dissolved each other preparation methods such as mixing the various components at an elevated temperature, wherein the liquid crystal composition is dissolved in a the compound solvent and mixed, and then fed out at the solvent was distilled off under reduced pressure; or a liquid crystal composition of the present invention may be prepared according to a conventional production method.

[0145] Test conditions and the specific meaning of the present invention, the following symbols:

[0146]%: weight percent;

[0147] ° C: temperature unit Celsius;

[Cited 014 Cp: crystal clear table does not see point (° C).

[0149] SN: indicates the liquid crystalline to the nematic phase branded point rC).

[0150] An: optical anisotropy, NO is the refractive index of ordinary light, ne is the refractive index of ordinary light non-test conditions, 589nm, 25 ° C.

[0151] Ae: the dielectric anisotropy, Ae = wherein, // £ is the dielectric constant parallel to the molecular axis, Shang E is the dielectric constant, the test conditions are perpendicular to the molecular axis is 25 ° C; of of ; HP4284A point L 2 microns TN cartridge.

[Cited 015 T: response time Hong S], test equipment as DMS-501, test condition is 25 + 0. 5 ° C, 5.2 micron cartridge TN left cartridge.

[0153] Vi. Liquid crystal optical threshold voltage [V], Vw of the liquid crystal saturation voltage [V], the test condition is left cartridge TN 5.2 microns, 25 ° C.

[0154] Ah 1: Rainbow rotational viscosity Pa • S], the test condition is 25 + 0. 5 ° C.

[0155] The following embodiments in conjunction with specific embodiments of the present invention is further illustrated, but the following exemplary embodiment of the present invention, the present invention is not limited to the embodiments W. Without departing from the spirit or scope of the present invention, the liquid crystal composition in the present invention may also W by adjusting the content of each component, modifications or improvements having different width values, the clearing point, the birefringence of the liquid crystal the mixture was transported to those skilled in the art will be apparent. The method according to a conventional method are not particularly described. As the material is not particularly described can obtained from commercial sources disclosed.

[0156] In an embodiment the respective components employed in the W, W can be synthesized by known methods, or are commercially available. These operation are conventional synthesis techniques, the resulting liquid crystal compound tested in accordance with standard electronic compounds.

[0157] Example respective predetermined proportion of the liquid crystal composition W according to the following embodiment, the liquid crystal composition was prepared. Preparation of the liquid crystal composition is carried out according to conventional methods in the art, such as taking heat, ultrasonic waves, etc. mixed suspension was prepared in accordance with a predetermined ratio.

[0158] The liquid crystal compound is percentage by weight of the liquid crystal composition disposed W taken, prepared and studied a liquid crystal composition set forth in the following embodiment. The following shows the composition of each of the liquid crystal composition and performance parameters of the test results.

[0159] Example 1

[0160]

[0201] Examples 1-10 and test results of basic performance parameters of Comparative Examples 1-4

[0202]

[0203] Example 1-2 and true performance testing results of Comparative Examples 1-4

[0204]

Trust performance testing results of Example 3-10 [0205] Embodiment

[0207] 1 to 10 W can be seen from the examples, this patent refers to a mixture having good low-temperature reliability, W, and the response time significantly improve the contrast, significantly lower rotational viscosity of advantages compared to Comparative Examples 1 to 4 at the same time W contrast and dark state luminance is significantly improved. In particular the ability to significantly improve the heat and light.

[020 cited in Examples 1 to 10 above, in this nematic liquid crystal composition may be maintained at a low temperature region fast response time, widens the TN, IPS mode liquid crystal temperature, and has a faster response time and a wider the range of viewing angles, W and have outstanding advantages in terms of contrast and reliability

[0209] While the present invention include only the above-described specific ratio, and mass percentage of material in Example 10, the composition and properties of the liquid crystal composition were tested, but the liquid crystal composition of the present invention may be in the above-described embodiments W based on the use of the present invention and the established formula I, II, III, IV, a compound represented by,, II, III, W, and preferred compounds of formula I IV for further development and modification can achieve this the object of the invention.

Claims (9)

A positive dielectric liquid crystal composition, characterized in that: said liquid crystal component A liquid crystal composition comprising one or more compounds of general formula I in a composition comprising one or more of the general formula II liquid crystal component B composed of a compound shown, comprising one or more of the general formula III in the liquid crystal component C composed of compounds, further comprising one or more S-1, of formula S-2, several structural formula of formula S-3, a compound of formula S-4 additive component consisting of D,

Wherein, Cyclealkyl is selected from cyclopentyl, cyclobutyl, cyclopropyl any of one, Sapporo selected from ①, ②, ③, any one of the groups shown in ④, ① H, Cl, F, CN, OCN, 0CF3, CF3, CHF2, CH2F, 0CHF2, SCN, NCS, SF5, ② the number of carbon atoms in a linear alkyl group having 1 to 15 carbon atoms, a straight-chain alkyl group having 1 to 15 carbon atoms, carbon atoms, or an alkenyl group having 2 to 15 straight-chain alkylene group having a straight chain of 2 to 15, ③ ② above in one or more -CH2- may be independently substituted with -CH = CH -, - CΞC -, - COO -, - OOC-, cyclobutane, cyclopentane, or form the group -0- -S- and instead to replace the oxygen atoms are not linked directly formed, the above ② ④ one or Η plurality are each independently F, C1 substituent at least one group of the formed;?? personal, private, 1 5, 1 6 are independently selected from! 1, carbon atoms, straight-chain alkyl group having 1 to 10 carbon atoms, a straight-chain alkyl group having 1 to 10 carbon atoms, 2 to 10, or straight-chain alkenyl group having 3 to 8 carbon atoms, straight-chain alkenyl group, any of which may be replaced by F Η;

Carbon atoms, straight-chain alkyl group having 1 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms, a straight-chain alkenyl is either straight-chain group of 2 to 10; Χρ Χ2, Χ3 parent 4 is independently selected from H, F, any one of; Yi is selected from F, carbon atoms, straight-chain alkyl group having 1 to 6 straight-chain alkoxy or straight-chain carbon atoms, alkenyl having 2 to 6 any one group, wherein the F Η is unsubstituted or mono-substituted or multi-substituted with F; 21 are independently selected from a single bond, -〇12 -, - 2- 〇12 〇1 -, - ( 〇12) 3 -, - (〇12) 4 -, - 〇1 = 〇1 -, - three square (: -, - (: 00 -, - ooc -, - cf2o -, - och2 -, - ch2o- , -ocf2 -, - cf2ch2 -, - CH2CF2 -, - C2F4- or -CF = CF- any one of; 23 is selected from a single bond, _012_, _012_012 _, _ (012) 3 _, _ (012) 4 _, _ _ = 01 01, _ (] tris (] _, _ (] 〇0_, _00 (] _, _ 0CH2 -, - CH20 -, - CF2CH2 -, - CH2CF2 -, - C2F4- or -CF = CF- in any one of;

> Are independently selected from a single bond

Any one of the groups;

Selected from the following (a), (b) a group shown in any one of, (A) trans-1,4-cyclohexylene, 1,4-cyclohexylene group, wherein one or more non- adjacent -CH2- groups are substituted or unsubstituted -〇- or -S-; (b) 1,4- phenylene group in which one or two -CH- substituted or unsubstituted N, a Η F or two substituted or unsubstituted; a, b, d respectively denote not 0,1,2,3, c is not 1 or table 2, e table is not 0, and a + b + c < 5.

A positive dielectric 2. The liquid crystal composition according to claim 1, wherein: the liquid crystal composition, the weight percentage of component A is 1 to 50%, by weight percentage of component B content of 1 to 70% weight percent of component C is square to 40%, component a, component B, component C content of the sum of two hundred to 100%.

A dielectrically positive liquid crystal composition according to claim 2, wherein: the content of the liquid crystal composition of the additive component D is 1 ~ 3000ppm.

4. A positive, liquid crystal composition according to claim 1, wherein: the liquid crystal composition further adding a weight percent of 0.0 ~ 05% of the optically active component.

One kind according to claim any one of claims 1 to 4, the positive dielectric liquid crystal composition, characterized in that: the particular compound of formula I the following Formula 1-1 to Formula 1-3 exemplified compound,

Wherein XY is selected from the following ①, ②, ③, any one of the groups shown in ④, ① H, Cl, F, CN, OCN, 0CF3, CF3, CHF2, CH2F, 0CHF2, SCN, NCS, SF5, alkenyl group or a C 1-8 carbon atoms, ② a straight-chain alkyl group having 1 to 15 carbon atoms, a straight-chain alkyl group having 1 to 15 carbon atoms and 2 to 15 is a linear straight chain having 2 to 15 alkenyloxy, ③ ② above in one or more -CH2- may be independently substituted with -CH = CH -, - CΞC -, - C00 -, - 00C-, cyclobutane, cyclopentane, -0 - the form of a group or -S- and instead oxygen atoms are not linked directly formed, ④ ② above one or more of Η each independently substituted with F, C1 substituted formed by at least one group species; Xi, X2 * not selected from H, F, any one of; 21, 22 is selected from a single bond, -〇12 -, - 2- 〇12 〇1 -, - (〇12) 3 -, - (〇12) 4 -, - 〇1 = 〇1 - - ONE THOUSAND AND THIRTY (: -, - (: 00 -, - ooc -, - cf2o -, - och2 -, - ch2o -, - ocf2 -, - cf2ch2 -, - CH2CF2 -, - C2F4- or -CF = CF- any one of;

They are independently selected from a single bond,

Any one of; a, b respectively denote not 0,1,2,3, c is not 1 or Table 2, and a + b + c <5.

6. A positive dielectric liquid crystal composition according to claim 5, wherein: said compound of Formula I is illustrated in the following specific formula I-1-a ~ formula I-3-t compound of,

Wherein, Ri is selected from the following ①, ②, ③, the groups represented by any one kind of ④, ① H, Cl, F, CN, OCN, 0CF3, CF3, CHF2, CH2F, 0CHF2, SCN, NCS, SF5, alkenyl group or a C 1-8 carbon atoms, ② a straight-chain alkyl group having 1 to 15 carbon atoms, a straight-chain alkyl group having 1 to 15 carbon atoms and 2 to 15 is a linear straight chain having 2 to 15 alkenyloxy, ③ ② above in one or more -CH2- may be independently substituted with -CH = CH -, - CΞC -, - COO -, - OOC-, cyclobutane, cyclopentane, -0 - the form of a group or -S- and instead oxygen atoms are not linked directly formed, ④ ② above one or more of Η each independently substituted with F, C1 substituted formed by at least one group species; table 0 or not any one of -CH2- (0); (F) Η table or not any one of F.

7. A positive dielectric liquid crystal composition according to any one of claims 1 to 4, wherein: the compound represented by Formula II is specifically shown by the following formula II_a ~ of formula II-i compound,

Wherein, R2, private independently selected from H, straight chain carbon atoms, alkyl group having 1 to 10 carbon atoms, a straight-chain alkyl group having 1 to 10 carbon atoms, or straight-chain alkenyl group having 2 to 10 carbons 3 to 8 atoms, straight-chain alkylene group, any of which may be replaced by F Η; (F) Η table or not any one of F.

In particular the following compounds of formula III-a ~ of formula III-u as shown in the general formula III: A positive according to claim ferroelectric liquid crystal composition according to any one of claims 1 to 4, characterized in that exemplified compound,

among them,

; Carbon atoms, straight-chain alkyl group having 1 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms, a straight-chain alkenyl is either straight-chain group of 2 to 10; Υ: selected F, the number of carbon atoms in a linear alkyl group having 1 to 6, or a linear alkoxy group having carbon atoms any one of a straight chain alkenyl group of 2 to 6, wherein Η is unsubstituted or mono F F polysubstituted or unsubstituted; (F) Η table or not any one of F.

9. A member according to claim one of the positive dielectric liquid crystal composition according to any claim 1 to 4, is applied to the liquid crystal display element and a liquid crystal display.