A negative liquid crystal composition and display device thereof

Abstract

The present invention relates to a negative liquid crystal composition and a display device thereof, belonging to the field of liquid crystal materials. The negative liquid crystal composition comprises at least one compound represented by a general formula P: at least one dielectric negative compound M, the compound M being selected from compounds represented by general formulas M-I and / or M-II: at least one compound represented by general formula F: and at least one compound represented by general formula I: The liquid crystal composition of the present invention has a large ε ∥ , thus having a larger liquid crystal capacitance, having a larger ε ⊥ , a higher ε ⊥ / |Δε|, its ε ⊥ / |Δε| ratio>2, with high transmittance and contrast. The PSVA liquid crystal device obtained by UV has good pre-tilt angle stability. At the same time, the liquid crystal composition has good low-temperature storage stability and low rotational viscosity, which can reduce the response time of the liquid crystal display.

Description

Technical Field

[0001] The invention relates to a liquid crystal composition and application, in particular to a negative liquid crystal composition and a display device thereof, belonging to the field of liquid crystal materials. Background Art

[0002] These liquid crystal display elements made by utilizing the refractive index anisotropy and dielectric anisotropy of liquid crystal compounds are widely used in display devices such as televisions and monitors. Among them, negative liquid crystal displays are popular due to their high contrast and good viewing angle characteristics. VA panels are very suitable for black content and scenes, with very high contrast and deep black. In recent years, with the continuous increase in display applications, display devices such as e-sports continue to increase their demand for display time. Compared with lower refresh rates, high refresh rates have some motion clarity advantages.

[0003] PSVA technology is also known as polymer stable vertical alignment. It is to add a small amount of polymerizable monomers into the liquid crystal body. Through the irradiation of ultraviolet light, the polymerizable monomers are polymerized to form a certain initial pre-tilt angle, thereby achieving the alignment of liquid crystal molecules.

[0004] However, due to the influence of the characteristics of liquid crystal materials, the parallel dielectric ε∥ of negative liquid crystal monomers is generally small, and the ε∥ of mixed liquid crystals is also relatively small, resulting in a small liquid crystal storage capacitor and a low liquid crystal transmittance. Therefore, it is necessary to provide a liquid crystal material with a large dielectric, a fast response and stable low-temperature performance.

[0005] At the same time, the existing PSVA technology also has the problem of stability of the pre-tilt angle formed by the polymer. Especially after long-term use, the change of the pre-tilt angle will cause the change of the optical performance of the liquid crystal panel and cause the decline of image quality. Therefore, it is also necessary to form a pre-tilt angle with sufficient stability. Summary of the invention

[0006] In view of the problems existing in the prior art, in order to improve the problems of low storage capacitance and low liquid crystal transmittance caused by small vertical dielectric ε⊥ and parallel dielectric ε∥ of liquid crystal in negative liquid crystal materials, and changes in the optical properties of liquid crystal panels and degradation of image quality caused by poor pretilt angle stability, the present invention discloses a negative liquid crystal composition, which has a large dielectric, a rapid response and stable low-temperature performance, and the pretilt angle formed has sufficient stability.

[0007] The liquid crystal composition of the present invention comprises a polymerizable component, a negative component, and a dielectrically positive difluoroether component, and has an overall negative dielectric property and large perpendicular dielectric property and parallel dielectric property.

[0008] The negative liquid crystal composition of the present invention comprises compound P, compound M, compound F and bicyclohexane compound I. The liquid crystal composition has low rotational viscosity when used as a liquid crystal material, can shorten the response time, and has good mutual solubility between components, thereby improving low-temperature performance.

[0009] To achieve the above object, the present invention adopts the following technical solutions:

[0010] A negative liquid crystal composition, comprising: at least one compound represented by the general formula P:

[0011]

[0012] Wherein, Ring A1, Ring A2, and Ring A3 each independently represent Said One or more H on the 3 replace;

[0013] Z 1 , Z 2 Each independently represents a carbon-carbon single bond, -CH 2 CH 2 -、-CH=CH-、-CF 2 O-、-OCF 2 -、-CH 2 O-、-OCH 2 -、-CO-O-、CF 2 CF 2 -or-CF=CF-;

[0014] P 1 , P 2 each independently of one another represents a polymerizable group, the polymerizable group being a methacrylate group or an acrylate group;

[0015] Sp 1 、Sp 2 Each independently represents a spacer group or a CC single bond; a spacer group is defined as a straight or branched alkyl chain group of 1 to 6 carbon atoms;

[0016] a and b are each independently an integer from 0 to 4;

[0017] At least one dielectric negative compound M, as the second component, the compound M is selected from the compounds represented by the following general formula MI and / or M-II:

[0018]

[0019] Among them, R M1 , R M2Each independently represents an alkyl group of 1 to 12 carbon atoms, or an alkoxy group of 1 to 12 carbon atoms; rings M1 and M2 each independently represent

[0020] Z M Indicates CC single bond, -CH 2 CH 2 -、-CF 2 O-、-OCF 2 -、-CH 2 O-、-OCH 2 -、-CO-O-、-C 2 F 4 -, or -CF=CF-;

[0021] m represents 0, 1 or 2;

[0022] At least one compound represented by general formula F is used as the third component:

[0023]

[0024] Among them, rings B1 and B2 are independent of each other. One or more H on the molecule may be replaced by F;

[0025] R B1 , R B2 Each independently represents an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, or an alkenyl group having 2 to 12 carbon atoms;

[0026] L B1 , L B2 Each independently represents F, Cl, CH 3 or CF 3 ;

[0027] e represents 0 or 1;

[0028] And at least one compound represented by general formula I as the fourth component:

[0029]

[0030] Among them, R D1 , R D2 Each independently represents an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, or an alkenyl group having 2 to 12 carbon atoms.

[0031] Furthermore, the compound of general formula P is selected from one or more compounds represented by the following general formulae PA to PK:

[0032]

[0033] Among them, P 1 , P 2 Each independently represents a methacrylate group or an acrylate group; Sp 2 It represents a spacer group or a single bond. The spacer group is a straight or branched alkyl chain group of 1 to 6 carbon atoms, and the single bond is a carbon-carbon single bond.

[0034] Furthermore, the compound of general formula P is selected from a combination of compounds represented by any two or more of the general formulae PA, PB, PD, PE, PF, PG and PH.

[0035] Furthermore, the compound of general formula P is selected from at least one compound represented by general formula PA, PB, PD, PE, PG and / or PH, and at least one compound represented by general formula PF.

[0036] Further, the general formula P may be selected from at least one compound of the general formula PA and at least one compound of the general formula PF;

[0037] Further, the general formula P may be selected from at least one compound of the general formula PB and at least one compound of the general formula PF;

[0038] Further, the general formula P may be selected from at least one compound of the general formula PD and at least one compound of the general formula PF;

[0039] Further, the general formula P may be selected from at least one compound of the general formula PG and at least one compound of the general formula PF;

[0040] Further, the general formula P may be selected from at least one compound of the general formula PE and at least one compound of the general formula PF;

[0041] Further, the general formula P can be selected from at least one compound of the general formula PH and at least one compound of the general formula PF.

[0042] Furthermore, the compound represented by the general formula P is selected from one or more of the following compounds P-1 to P-50:

[0043]

[0044]

[0045]

[0046]

[0047] In the present invention, the weight percentage of the compound represented by the general formula P in the liquid crystal composition is 0.01% to 3%, for example, 0.1%, 0.15%, 0.2%, 0.25%, 0.3%, 0.35%, 0.4%, 0.45%, etc.; preferably, the weight percentage of the compound represented by the general formula P in the liquid crystal composition is 0.01% to 2%; further preferably, the weight percentage of the compound represented by the general formula P in the liquid crystal composition is 0.25% to 0.50%.

[0048] Furthermore, the compound of general formula M is selected from one or more of the compounds represented by the following general formulae MA to ML:

[0049]

[0050]

[0051] Among them, R M1 , R M2 Each independently represents an alkyl group having 1 to 12 carbon atoms or an alkoxy group having 1 to 12 carbon atoms.

[0052] Furthermore, the compound represented by the general formula M is selected from a combination of any three or more compounds represented by the general formulae MA, MB, MC, MD, ME and MJ.

[0053] Further, the general formula M can be selected from at least one compound of the general formula MA, at least one compound of the general formula MB and at least one compound of MC;

[0054] Further, the general formula M can be selected from at least one compound of the general formula MA, at least one compound of the general formula MB, at least one compound of MC and at least one compound of MD;

[0055] Further, the general formula M may be selected from at least one compound of the general formula MA, at least one compound of the general formula MB, at least one compound of MC and at least one compound of ME;

[0056] Further, the general formula M can be selected from at least one compound of the general formula MA, at least one compound of the general formula MB, at least one compound of MC and at least one compound of MJ;

[0057] Further, the general formula M may be selected from at least one compound of the general formula MA, at least one compound of the general formula MB, at least one compound of MC, at least one compound of MD and at least one compound of ME;

[0058] Further, the general formula M may be selected from at least one compound of the general formula MA, at least one compound of the general formula MC, at least one compound of MD, at least one compound of ME and at least one compound of MJ;

[0059] Further, the general formula M may be selected from at least one compound of the general formula MC, at least one compound of the general formula MD and at least one compound of ME;

[0060] Furthermore, the general formula M can be selected from at least one compound of the general formula MC, at least one compound of the general formula MD, at least one compound of ME and at least one compound of MJ.

[0061] In some embodiments of the present invention, the compound of formula M is selected from one or more of the following compounds M-1 to M-96:

[0062]

[0063]

[0064]

[0065]

[0066]

[0067] Relative to the total weight of the liquid crystal composition of the present invention, the weight percentage of the compound represented by the general formula M is 40%-75%, preferably 40-70%, 41%-68%, 42%-67%, 43%-66%, 44%-64%, 45%-62%, 46%-60%. Relative to the total weight of the liquid crystal composition of the present invention, the lower limit of the weight percentage of the compound represented by the general formula M is 40%, 41%, 42%, 43%, 44%, 45% or 46%; the upper limit of the weight percentage of the compound represented by the general formula M is 70%, 68%, 67%, 66%, 64%, 62% or 60%.

[0068] Furthermore, the compound of general formula F is selected from one or more of the compounds represented by the following general formulae F-1 to F-22:

[0069]

[0070]

[0071] Among them, R B1 , R B2 Each independently represents an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, or an alkenyl group having 2 to 12 carbon atoms.

[0072] Furthermore, the compound of general formula F is selected from a combination of compounds represented by any two or more of general formulae F-1, F-4, F-6, F-9, F-18, F-19 and F-22.

[0073] Furthermore, the compound of general formula F is selected from at least one compound represented by general formula F-1, F-4, F-6, F-9, F-18 and / or F-19, and at least one compound represented by F-22.

[0074] Further, the general formula F can be selected from at least one compound of the general formula F-1 and at least one compound of the general formula F-22;

[0075] Further, the general formula F can be selected from at least one compound of the general formula F-18 and at least one compound of the general formula F-22;

[0076] Further, the general formula F can be selected from at least one compound of the general formula F-9 and at least one compound of the general formula F-22;

[0077] Further, the general formula F can be selected from at least one compound of the general formula F-4 and at least one compound of the general formula F-22;

[0078] Further, the general formula F can be selected from at least one compound of the general formula F-6 and at least one compound of the general formula F-22.

[0079] Relative to the total weight of the liquid crystal composition of the present invention, the lower limit of the weight percentage of the compound of formula F is 1%-20%, and more preferably 1.5%-18%, 2%-16%, 3%-15%, 4%-14%, 5%-12%, 6%-10%, 7%-10%, 8%-10% or 9%-10%. The lower limit of the weight percentage of the compound of formula F is 1%, 1.5%, 2%, 3%, 4%, 5%, 6%, 7%, 8% or 9%; relative to the total weight of the liquid crystal composition of the present invention, the upper limit of the weight percentage of the compound of formula F is 20%, 18%, 16%, 15%, 14%, 12% or 10%.

[0080] In some embodiments of the present invention, preferably, the compound of formula I is one or more compounds selected from the group consisting of the following compounds I-1 to I-18:

[0081]

[0082] Relative to the total weight of the liquid crystal composition of the present invention, the weight percentage of the compound of general formula I is 1%-58.99%, and further preferably 1.5%-58.5%, 2%-56%, 3%-54%, 4%-52%, 5%-50%, 6%-48%, 7%-45%, 8%-40%, 9%-38%, 10%-35%, 12%-30%, 14%-28%, 16%-26%, 20%-24% or 22%-24%. Relative to the total weight of the liquid crystal composition of the present invention, the lower limit of the weight percentage of the compound of general formula I is 1%, 1.5%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 14%, 16%, 20%, 22%, 24% or 26%; the upper limit of the weight percentage of the compound of general formula I is 58.5%, 58%, 56%, 54%, 52%, 50%, 48%, 45%, 40%, 38%, 35%, 30%, 28%, 26%, 24%, 20%, 18%, 16%, 15%, 14%, 12% or 10%.

[0083] In the liquid crystal composition, calculated by mass percentage, the content of the compound represented by general formula P is 0.01-3%, the content of the compound represented by general formula M is 40-75%, the content of the compound represented by general formula F is 1-20%, and the content of the compound represented by general formula I is 1-58.5%.

[0084] In some embodiments of the present invention, the liquid crystal composition of the present invention further comprises one or more compounds represented by general formula II:

[0085]

[0086] Among them, R C1 , R C2 Each independently represents an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, or an alkenyl group having 2 to 12 carbon atoms;

[0087] Rings C1, C2, and C3 are each independently low and At most one H on can be replaced by F;

[0088] c represents 0, 1, 2. When c represents 2, the ring C2 may be the same or different;

[0089] d represents 0 or 1.

[0090] In some embodiments of the present invention, the compound of formula II is preferably selected from the compounds represented by formula II-A to formula II-H:

[0091]

[0092] Among them, R C1 , R C2 Each independently represents an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, or an alkenyl group having 2 to 12 carbon atoms.

[0093] Furthermore, the compound represented by general formula II is selected from a combination of compounds represented by any two or more of general formulae II-A, II-B, II-C, II-D, II-G and II-H.

[0094] Further, Formula II may be selected from at least one compound of Formula II-A and at least one compound of Formula II-C;

[0095] Further, Formula II may be selected from at least one compound of Formula II-B and at least one compound of Formula II-C;

[0096] Further, Formula II may be selected from at least one compound of Formula II-B and at least one compound of Formula II-D;

[0097] Further, Formula II may be selected from at least one compound of Formula II-B and at least one compound of Formula II-G;

[0098] Further, the general formula II can be selected from at least one compound of the general formula II-B and at least one compound of the general formula II-H.

[0099] In some embodiments of the present invention, preferably, the compound of formula II is one or more compounds selected from the group consisting of the following compounds II-1 to II-68:

[0100]

[0101]

[0102]

[0103] Relative to the total weight of the liquid crystal composition of the present invention, the weight percentage of the compound of general formula II is 1%-60%, preferably 1.5%-58%, 2%-56%, 3%-54%, 4%-52%, 5%-50%, 6%-48%, 7%-45%, 8%-40%, 9%-38%, 10%-35%, 12%-30%, 14%-28%, 16%-26%, 20%-24% or 22%-24%. Relative to the total weight of the liquid crystal composition of the present invention, the lower limit of the weight percentage of the compound of general formula II is 1%, 1.5%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 14%, 16%, 20%, 22%, 24% or 26%; the upper limit of the weight percentage of the compound of general formula II is 60%, 58%, 56%, 54%, 52%, 50%, 48%, 45%, 40%, 38%, 35%, 30%, 28%, 26%, 24%, 20%, 18%, 16%, 15%, 14%, 12% or 10%.

[0104] After adding the compound of general formula II, in the liquid crystal composition, calculated by mass percentage, the content of the compound of general formula P is 0.01-3%, the content of the compound represented by general formula M is 40-75%, the content of the compound represented by general formula F is 1-20%, the content of the compound represented by general formula I is 1-57.5%, and the weight percentage of the compound of general formula II is 1%-57.5%.

[0105] Furthermore, one or more chiral agents are added to the liquid crystal mixture of the present invention, and the content of the chiral agent accounts for 0-5% by mass of the entire liquid crystal composition.

[0106] The chiral compound is selected from one or more of the following compounds:

[0107]

[0108]

[0109] as well as

[0110]

[0111] On the other hand, the liquid crystal composition provided by the present invention further comprises one or more additives known to those skilled in the art and described in the literature, such as a stabilizer.

[0112] For example, one or more stabilizers having the following structures may be added to the liquid crystal mixture of the present invention:

[0113]

[0114]

[0115]

[0116] Preferably, the stabilizer is selected from one or more stabilizers having the following structures:

[0117]

[0118] In the stabilizer, n represents an integer of 1-12, for example, n represents 1, 2, 3, 4, 5, 6, 8, 10 or 11, etc.

[0119] In an embodiment of the present invention, the stabilizer preferably accounts for 0-5% of the total weight of the liquid crystal composition; more preferably, the stabilizer accounts for 0-1% of the total weight of the liquid crystal composition; as a particularly preferred embodiment, the stabilizer accounts for 0.01-0.2% of the total weight of the liquid crystal composition.

[0120] The negative liquid crystal composition of the present invention can be used in the preparation of liquid crystal display devices. The present invention provides a liquid crystal display device comprising the negative liquid crystal composition of the present invention, wherein the display device includes VA, MVA, PVA, PSVA, IPS and FFS mode liquid crystal display devices.

[0121] Advantages of the present invention:

[0122] The liquid crystal composition of the present invention has large vertical dielectric and parallel dielectric properties, high storage capacitance and good transmittance.

[0123] The liquid crystal composition of the present invention has a large ε ∥ , thus having a larger liquid crystal capacitance, and also having a larger ε ⊥ , with a higher ε ⊥ / |Δε|, its ε ⊥ / |Δε| ratio>2, with high transmittance and contrast. The PSVA liquid crystal device obtained by UV has good pre-tilt angle stability. At the same time, the liquid crystal composition of the present invention has good low-temperature storage stability and low rotational viscosity, which can reduce the response time of the liquid crystal display. DETAILED DESCRIPTION

[0124] For ease of expression, in the following embodiments, the group structures of the liquid crystal compositions are represented by the codes listed in Table 1.

[0125] Table 1 Group structure codes of liquid crystal compounds

[0126]

[0127]

[0128] Take the following compound as an example:

[0129]

[0130] Expressed using the code in Table 1, it is 3PGP2.

[0131] Another example:

[0132]

[0133] Expressed as 3PGUQUF.

[0134] The abbreviated codes for the test items in the following embodiments are as follows:

[0135] Cp (℃): clearing point (nematic-isotropic phase transition temperature);

[0136] Δn: refractive index anisotropy (589nm, 25℃);

[0137] Δε: dielectric anisotropy (1KHz, 25℃);

[0138] ε⊥ / |Δε|: The ratio of the vertical dielectric to the absolute value of the dielectric, which is proportional to the contrast of the VA type display device;

[0139] t(ms): response time (25±0.5℃); Liquid crystal is filled between two glass substrates and measured with LCT-5016 t=t on +t off :t on It represents the time required for the relative transmittance to change from 10% to 90%, t off It indicates the time required for the relative transmittance to change from 90% to 10%;

[0140] γ 1 : represents the rotational viscosity [mPa·s] measured at 25°C, which is measured by the rotation method in a magnetic field;

[0141] Where Δε=ε || -ε ⊥ , where ε || is the dielectric constant parallel to the molecular axis, ε ⊥ is the dielectric constant perpendicular to the molecular axis, test conditions: 25°C, 1KHz;

[0142] LTS: Low temperature storage stability, the liquid crystal mixture is stored in a glass bottle at low temperature;

[0143] Pitch: When a chiral agent is added to a nematic liquid crystal compound, a liquid crystal with a certain pitch is formed. The pitch is measured by filling the liquid crystal between the wedge-shaped box and using a reading microscope.

[0144] Pretilt Angle: The angle between the long axis of the liquid crystal molecule and the glass substrate. The liquid crystal is filled between two glass substrates and measured using OPTIPRO.

[0145] Example 1: A mixture M1 was prepared according to the compounds and weight percentages listed in Table 2, and filled between two substrates of a liquid crystal display for performance testing. The composition and test data of the mixture M1 are shown in Table 2 below.

[0146] Table 2 Composition (wt%) and test performance of the liquid crystal composition of Example 1

[0147]

[0148] Comparative Example 1: A mixture D1 was prepared according to the compounds and weight percentages listed in Table 3, and filled between two substrates of a liquid crystal display for performance testing. The composition and test data of the mixture D1 are shown in Table 3 below.

[0149] Table 3 Composition (weight %) and test performance of the liquid crystal composition of Comparative Example 1

[0150]

[0151] Example 2: A mixture M2 was prepared according to the compounds and weight percentages listed in Table 4, and filled between two substrates of a liquid crystal display for performance testing. The composition and test data of the mixture M2 are shown in Table 4 below.

[0152] Table 4 Composition (weight %) and test performance of the liquid crystal composition of Example 2

[0153]

[0154] Example 3: A mixture M3 was prepared according to the compounds and weight percentages listed in Table 5, and filled between two substrates of a liquid crystal display for performance testing. The composition and test data of the mixture M3 are shown in Table 5 below.

[0155] Table 5 Composition (weight %) and test performance of the liquid crystal composition of Example 3

[0156]

[0157] Example 4: A mixture M4 was prepared according to the compounds and weight percentages listed in Table 6, and filled between two substrates of a liquid crystal display for performance testing. The composition and test data of the mixture M4 are shown in Table 6 below.

[0158] Table 6 Composition (weight %) and test performance of the liquid crystal composition of Example 4

[0159]

[0160]

[0161] To the above mixture, an additional 100 ppm of additives were added:

[0162]

[0163] Example 5: A mixture M5 was prepared according to the compounds and weight percentages listed in Table 7, and filled between two substrates of a liquid crystal display for performance testing. The composition and test data of the mixture M5 are shown in Table 7 below.

[0164] Table 7 Composition (wt%) and test performance of the liquid crystal composition of Example 5

[0165]

[0166] To the above mixture, an additional 200 ppm of additives were added:

[0167]

[0168] Example 6: A mixture M6 was prepared according to the compounds and weight percentages listed in Table 8, and filled between two substrates of a liquid crystal display for performance testing. The composition and test data of the mixture M6 are shown in Table 8 below.

[0169] Table 8 Composition (weight %) and test performance of the liquid crystal composition of Example 6

[0170]

[0171] To the above mixture, an additional 300 ppm of additives were added:

[0172]

[0173] Example 7: A mixture M7 was prepared according to the compounds and weight percentages listed in Table 9, and filled between two substrates of a liquid crystal display for performance testing. The composition and test data of the mixture M7 are shown in Table 9 below.

[0174] Table 9 Composition (weight %) and test performance of the liquid crystal composition of Example 7

[0175]

[0176]

[0177] Example 8: A mixture M8 was prepared according to the compounds and weight percentages listed in Table 10, and filled between two substrates of a liquid crystal display for performance testing. The composition and test data of the mixture M8 are shown in Table 10 below.

[0178] Table 10 Composition (weight %) and test performance of the liquid crystal composition of Example 8

[0179]

[0180] 0.3% of chiral compound S811 was additionally added to the above mixture, and its helical pitch was measured to be 49 μm.

[0181] To test the PSVA pretilt angle generation and its stability, a voltage of 16V was applied to the two glass substrates filled with liquid crystals, and UV light with a wavelength of 313nm and an intensity of 5mw / cm 2 Irradiate for 120 s, then use 0.5 mw / cm 2 After irradiating with UV light for 60 minutes, the pretilt angle is measured to obtain the initial pretilt angle. Then the glass substrate is placed in an oven with a set temperature of 60°C. After 168 hours, the pretilt angle is tested and the degree of change in the pretilt angle is calculated.

[0182] Table 11 Pretilt Angle Changes of Liquid Crystal Compositions of Examples and Comparative Examples

[0183] Initial pretilt angle / ° Pretilt angle after 168h / ° Pretilt angle change / ° M1 88.5 88.6 0.1 D1 88.4 88.8 0.4 M2 88.6 88.7 0.1 M3 88.3 88.5 0.2 M4 88.8 88.8 0 M5 88.5 88.6 0.1 M6 88.4 88.5 0.1 M7 88.5 88.7 0.2 M8 88.7 88.8 0.1

[0184] It can be seen from the above Examples 1-8 and Comparative Example 1 that the liquid crystal composition of the present invention has a large ε ∥ , thus having a larger liquid crystal capacitance, and also having a larger ε ⊥ , with a higher ε ⊥ / |Δε|, its ε ⊥ / |Δε| ratio>2, with high transmittance and contrast. The PSVA liquid crystal device obtained by UV has good pre-tilt angle stability. At the same time, the liquid crystal composition of the present invention has good low-temperature storage stability and low rotational viscosity, which can reduce the response time of the liquid crystal display.

[0185] Although several exemplary embodiments have been described above in detail, the disclosed embodiments are exemplary and non-restrictive only, and those skilled in the art will readily appreciate that many other modifications, alterations and / or substitutions are possible in the exemplary embodiments without materially departing from the novel teachings and advantages of the present disclosure. Therefore, all such modifications, alterations and / or substitutions are intended to be included within the scope of the present disclosure as defined by the appended claims.

Claims

1. A negative liquid crystal composition, characterized in that: Contains at least one compound represented by the general formula P: Wherein, Ring A1, Ring A2, and Ring A3 each independently represent Said One or more H on the may be replaced by -F, -Cl or -OCH3; Z 1、 Z2 each independently represents a carbon-carbon single bond, -CH2CH2-, -CH=CH-, -CF2O-, -OCF2-, -CH2O-, -OCH2-, -CO-O-, CF2CF2- or -CF=CF-; P1 and P2 each independently represent a methacrylate group or an acrylate group; Sp1 and Sp2 each independently represent a spacer group or a CC single bond; the spacer group is a straight or branched alkyl chain group of 1 to 6 carbon atoms; a and b each independently represent an integer from 0 to 4; At least one dielectric negative compound M, the compound of general formula M is selected from the combination of any three or more compounds of general formulae MA, MB, MC, MD, ME and MJ: Among them, R M1 , R M2 Each independently represents an alkyl group having 1 to 12 carbon atoms, or an alkoxy group having 1 to 12 carbon atoms; At least one compound represented by the general formula F, the compound of the general formula F is selected from one or more of the compounds represented by the following general formulas F-1, F-4, F-6, F-9, F-18, F-19 and F-22: in, R B1 , R B2 Each independently represents an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, or an alkenyl group having 2 to 12 carbon atoms; At least one compound of formula I: Among them, R D1 , R D2 Each independently represents an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, or an alkenyl group having 2 to 12 carbon atoms; And one or more compounds of general formula II: Among them, R C1 , R C2 Each independently represents an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, or an alkenyl group having 2 to 12 carbon atoms; Rings C1, C2, and C3 are each independently low and At most one H on can be replaced by F; c represents 0, 1, 2. When c represents 2, the ring C2 may be the same or different; d represents 0 or 1.

2. The negative liquid crystal composition according to claim 1, characterized in that: The compound of general formula P is selected from one or more compounds represented by the following general formulae PA to PK:

3. The negative liquid crystal composition according to claim 1, characterized in that: The compound of general formula II is selected from the compounds shown in general formula II-A to general formula II-H:

4. The negative liquid crystal composition according to claim 1, characterized in that: In the liquid crystal composition, calculated by mass percentage, the content of the compound represented by the general formula P is 0.01-3%, the content of the compound represented by the general formula M is 40-75%, the content of the compound represented by the general formula F is 1-20%, the content of the compound represented by the general formula I is 1-57.5%, and the weight percentage of the compound represented by the general formula II is 1%-57.5%.

5. The negative liquid crystal composition according to any one of claims 1 to 4, characterized in that: The liquid crystal composition further comprises one or more chiral agents, and the mass percentage of the chiral agents in the entire liquid crystal composition is 0-5%.

6. The negative liquid crystal composition according to any one of claims 1 to 4, characterized in that: The liquid crystal composition further comprises one or more stabilizers, and the mass percentage content of the stabilizers is 0-5%.

7. A liquid crystal display device, characterized in that: The negative liquid crystal composition comprises the negative liquid crystal composition described in any one of claims 1 to 6, wherein the liquid crystal display device comprises VA, MVA, PVA, PSVA, IPS and FFS mode liquid crystal display devices.

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