Liquid crystal composition and display device thereof

Abstract

The present invention relates to a liquid crystal composition and a display device thereof, and belongs to the field of liquid crystal materials. The liquid crystal composition comprises at least one dielectric negative compound M, and the compound M is selected from compounds represented by the general formula M-I and / or M-II: at least one compound represented by the general formula G: at least one compound represented by the general formula I: and at least one compound represented by the general formula P: The liquid crystal composition of the present invention has large vertical dielectric and parallel dielectric of the liquid crystal, high storage capacitance, and high transmittance and contrast. The PSVA mixture prepared by the present invention has good pre-tilt angle forming ability, and the liquid crystal composition of the present invention has good low-temperature storage stability, low rotational viscosity, and can reduce the response time of the liquid crystal display.

Description

Technical Field

[0001] The invention relates to a liquid crystal composition and a display device thereof, in particular to a negative liquid crystal composition and application 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] However, due to the influence of the characteristics of liquid crystal materials, the ε∥ of negative liquid crystal monomers is generally small, and the ε⊥ of 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.

[0004] Meanwhile, PSVA (polymer stabilized vertical alignment) display technology is to add a certain amount of polymerizable liquid crystal compound (RM) to the nematic liquid crystal host, then fill the liquid crystal between two glass substrates with electrodes, apply a certain voltage, and the liquid crystal molecules rotate under the action of the electric field to form a certain initial pre-tilt angle, and then irradiate with ultraviolet light of a certain energy to polymerize the polymerizable monomers therein to form a cross-linked network. When the applied voltage is removed, the formed pre-tilt angle is maintained due to the cross-linked network. In actual processes, not all polymerizable monomers and liquid crystal hosts are suitable for PSVA technology. In the prior art, after the mixed liquid crystal is irradiated with UV light, some polymerizable monomers will remain. During the image display process, it is triggered by the environment or backlight and uncontrolled polymerization occurs, resulting in a change in the pre-tilt angle of the region. During the process of switching the screen of the liquid crystal display, the transmittance of the region changes unexpectedly, resulting in the occurrence of afterimages. Another problem that has been observed in the use of PSVA displays is the stability of the pre-tilt angle. The reason is that the pretilt angle generated by the polymerized RM during display manufacturing cannot remain constant after a long period of charge and discharge operation. As a result, the pretilt angle of the LCD will change, thereby reducing the performance of the LCD.

[0005] Therefore, a liquid crystal composition having the following characteristics is particularly desired: during UV light irradiation, the RM polymerization in the liquid crystal mixture is controllable, the pretilt angle formed is uniform and can be stably maintained, and the RM residue after polymerization is as small as possible. In addition, this type of liquid crystal composition should have a lower rotational viscosity to achieve the purpose of reducing the response time. Summary of the invention

[0006] In view of the problems existing in the prior art, in order to improve the problems that the parallel dielectric ε∥ and the vertical dielectric ε⊥ of the negative liquid crystal are small, so that the liquid crystal storage capacitance is small, the liquid crystal transmittance is low, and the stability of the pretilt angle is poor, the present invention discloses a negative liquid crystal composition, which has a negative dielectric, comprises a polymerizable monomer, a negative component and a positive monomer. The material has a large dielectric, a rapid response, stable low-temperature performance, and a stable pretilt angle.

[0007] The liquid crystal composition of the present invention comprises a dielectric negative compound M and a bicyclohexane compound. The liquid crystal composition is used as a liquid crystal material with low rotational viscosity, which can shorten the response time. At the same time, the components have good mutual solubility and improve low-temperature performance. The liquid crystal composition of the present invention has good low-temperature storage stability and low rotational viscosity, and can reduce the response time of a liquid crystal display.

[0008] To achieve the above object, the present invention adopts the following technical solutions:

[0009] A liquid crystal composition comprises: at least one dielectric negative compound M as a first component, wherein the compound M is selected from the compounds represented by the following general formula MI and / or M-II:

[0010]

[0011] Among them, R M1 , R M2 Each 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

[0012] Z M represents a CC single bond, -CH2CH2-, -CF2O-, -OCF2-, -CH2O-, -OCH2-, -CO-O-, -C2F4-, or -CF=CF-;

[0013] m represents 0, 1 or 2;

[0014] It also contains at least one compound represented by the general formula G as a second component:

[0015]

[0016] Among them, rings B1 and B2 are independent of each other. One or more H on the molecule may be replaced by F;

[0017] R B1 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;

[0018] R B2 represents F, Cl, CF3 or -OCF3;

[0019] L B1 , L B2 Each independently represents F or H;

[0020] Z2 represents a CC single bond or -CH2CH2-;

[0021] a represents 0 or 1;

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

[0023]

[0024] 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;

[0025] Rings C1, C2, and C3 are represented independently and At most one H on can be replaced by F;

[0026] b represents 0, 1 or 2. When b represents 2, the ring C2 may be the same or different;

[0027] c represents 0 or 1;

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

[0029]

[0030] Wherein, Ring A1, Ring A2, and Ring A3 are each independently represented by Said One or more H on the may be replaced by -F, -Cl or -OCH3;

[0031] Z1 and Z2 each independently represent a carbon-carbon single bond, -CH2CH2-, -CH=CH-, -CF2O-, -OCF2-, -CH2O-, -OCH2-, -CO-O-, CF2CF2- or -CF=CF-;

[0032] P1 and P2 each independently represent a polymerizable group, and the polymerizable group is a methacrylate group or an acrylate group;

[0033] 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;

[0034] d and e are each independently an integer of 0-4.

[0035] Further, the compound of general formula M is selected from one or more of the following compounds MA to ML:

[0036]

[0037]

[0038] 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.

[0039] 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.

[0040] 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;

[0041] 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;

[0042] 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;

[0043] 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;

[0044] 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;

[0045] 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;

[0046] 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;

[0047] 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.

[0048] 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:

[0049]

[0050]

[0051]

[0052]

[0053]

[0054] 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%-76%, preferably 40%-70%, 41%-68%, 42%-66%, 43%-64%, 44%-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% or 46%; the upper limit of the weight percentage of the compound represented by the general formula M is 70%, 68%, 66%, 64%, 62% or 60%.

[0055] Furthermore, the compound of formula I is selected from one or more of the compounds represented by the following formulas IA to IH:

[0056]

[0057] Among them, R C1 , R C2Each 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.

[0058] Furthermore, the compound of formula I is selected from a combination of compounds represented by any two or more of formulae IA, IB, IC, ID and IE.

[0059] Further, the general formula I can be selected from at least one compound of the general formula IA, at least one compound of the general formula IC;

[0060] Further, Formula I can be selected from at least one compound of Formula IB, at least one compound of Formula ID;

[0061] Further, the general formula I can be selected from at least one compound of the general formula IB, at least one compound of the general formula IC;

[0062] Further, Formula I can be selected from at least one compound of Formula IB, at least one compound of Formula ID;

[0063] Further, Formula I can be selected from at least one compound of Formula ID, at least one compound of Formula IE;

[0064] Furthermore, the compound of formula I can be selected from at least one compound of formula IA, at least one compound of formula ID, and at least one compound of formula IE.

[0065] 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-68:

[0066]

[0067]

[0068]

[0069] 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%-50%, preferably 1.5%-48%, 2%-45%, 3%-40%, 4%-38%, 5%-35%, 6%-30%, 7%-28%, 8%-26%, 9%-24%, 10%-20%, 12%-18% or 14%-16%. 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 50%, 48%, 45%, 40%, 38%, 35%, 30%, 28%, 26%, 24%, 20%, 18%, 16%, 15%, 14%, 12% or 10%.

[0070] Furthermore, the compound of general formula G is selected from one or more of the compounds represented by the following general formulae G-1 to G-14:

[0071]

[0072] Among them, R B1 It 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.

[0073] Furthermore, the compound represented by general formula G is selected from a combination of compounds represented by any two or more of general formulae G-1, G-3, G-5, G-6, G-7, G-13 and G-14.

[0074] Further, the general formula G can be selected from at least one compound of the general formula G-1 and at least one compound of the general formula G-5;

[0075] Further, the general formula G can be selected from at least one compound of the general formula G-3 and at least one compound of the general formula G-5;

[0076] Further, the general formula G can be selected from at least one compound of the general formula G-5 and at least one compound of the general formula G-13;

[0077] Further, the general formula G is selected from at least one compound of the general formula G-13 and at least one compound of the general formula G-14;

[0078] Further, the general formula G can be selected from at least one compound of the general formula G-1 and at least one compound of the general formula G-6;

[0079] Furthermore, the general formula G can be selected from at least one compound of the general formula G-6 and at least one compound of the general formula G-7.

[0080] Relative to the total weight of the liquid crystal composition of the present invention, the weight percentage of the compound of the general formula G is 1%-20%, preferably 1.5%-20%, 2%-20%, 3%-20%, 3%-18%, 4%-16%, 5%-15%, 6%-14%, 7%-12% or 8%-10%. 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 the general formula G is 1%, 1.5%, 2%, 3%, 4%, 5%, 6%, 7% or 8%; the upper limit of the weight percentage of the compound of the general formula G is 20%, 18%, 16%, 15%, 14%, 12% or 10%.

[0081] Furthermore, the compound represented by the general formula P is selected from one or more of the following compounds of the general formulae PA to PK:

[0082]

[0083] Wherein, Sp2 represents a spacer group or a single bond. The spacer group is defined as a linear or branched alkyl linking group of 1 to 6 carbon atoms, and P1 and P2 each independently represent a methacrylate group or an acrylate group.

[0084] 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.

[0085] 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.

[0086] Further, the general formula P can be selected from at least one compound of the general formula PA and at least one compound of the general formula PF; further, the general formula P can be selected from at least one compound of the general formula PB and at least one compound of the general formula PF; further, the general formula P can be selected from at least one compound of the general formula PD and at least one compound of the general formula PF; further, the general formula P can be selected from at least one compound of the general formula PG and at least one compound of the general formula PF; further, the general formula P can be selected from at least one compound of the general formula PE and at least one compound of the general formula PF; 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. Further, the compound represented by the general formula P is selected from one or more of the following compounds P-1 to P-50:

[0087]

[0088]

[0089]

[0090] In the present invention, the weight percentage of the compound represented by the general formula P in the liquid crystal composition is 0.1% 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 0.1% 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%.

[0091] In the liquid crystal composition, calculated by mass percentage, the content of the compound represented by general formula G is 1-20%, the content of the compound represented by general formula M is 40-76%, the content of the compound represented by general formula I is 1-50%, and the content of the compound represented by general formula P is 0.1-3%.

[0092] In some embodiments of the present invention, the liquid crystal composition further comprises a compound represented by general formula II:

[0093]

[0094] 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.

[0095] 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-19:

[0096]

[0097]

[0098] 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-2, II-4, II-8, II-12, II-16, II-18 and II-19.

[0099] Further, the general formula II can be selected from at least one compound of formula II-2 and at least one compound of formula II-4;

[0100] Further, the general formula II can be selected from at least one compound of formula II-16 and at least one compound of formula II-19;

[0101] Further, the general formula II can be selected from at least one compound of the general formula II-2, at least one compound of the formula II-4 and at least one compound of the formula II-8;

[0102] Further, the general formula II can be selected from at least one compound of formula II-2 and at least one compound of formula II-16;

[0103] Further, the general formula II can be selected from at least one compound of formula II-12 and at least one compound of formula II-16;

[0104] Furthermore, the general formula II can be selected from at least one compound of formula II-16 and at least one compound of formula II-18.

[0105] 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%, and further 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%.

[0106] In the liquid crystal composition, calculated by mass percentage, the content of the compound represented by general formula G is 1-20%, the content of the compound represented by general formula M is 40-76%, the content of the compound represented by general formula I is 1-50%, the content of the compound represented by general formula P is 0.1-3%, and the weight percentage of the compound represented by general formula II is 1%-57.9%.

[0107] On the other hand, the liquid crystal composition provided by the present invention further comprises one or more chiral agents, and the content of the chiral agent accounts for 0-5% by weight of the entire liquid crystal composition.

[0108] Furthermore, the chiral compound is selected from one or more of the following compounds:

[0109]

[0110]

[0111] On the other hand, the liquid crystal composition provided by the present invention further comprises one or more additives, such as stabilizers, etc. For example, one or more stabilizers having the following structures may be added to the liquid crystal mixture of the present invention:

[0112]

[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| ratio, with higher transmittance and contrast.

[0124] The PSVA mixture prepared by the invention has good pre-tilt angle forming ability, and the liquid crystal composition of the invention has good low-temperature storage stability and low rotational viscosity, and can reduce the response time of the liquid crystal display. DETAILED DESCRIPTION

[0125] 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.

[0126] Table 1 Group structure codes of liquid crystal compounds

[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 3PGUF.

[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] 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;

[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] γ1: represents the rotational viscosity [mPa·s] measured at 25°C, which is measured by the rotation method in a magnetic field;

[0141] LTS: Low temperature storage stability, the liquid crystal mixture is stored in a glass bottle under low temperature conditions.

[0142] 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.

[0143] 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.

[0144] Example 1: A mixture M1 was prepared according to the weight percentage of each compound listed in Table 2, and filled in a test box with a vertical orientation for performance testing. After applying a voltage of 18 V, a UV light with a wavelength of 313 nm and a power of 5 mW / cm 2 The box was irradiated with a power of and an irradiation time of 110 s to form a pretilt angle. The composition and test data of the mixture M1 are shown in Table 2 below.

[0145] Table 2 Composition (wt%) and test performance of the liquid crystal composition of Example 1

[0146]

[0147]

[0148] Comparative Example 1: A mixture D1 was prepared according to the compounds and weight percentages listed in Table 3, and filled into a test box with a vertical orientation for performance testing. After applying a voltage of 18 V, a UV light with a wavelength of 313 nm and a power of 5 mW / cm 2 The box was irradiated with a power of and an irradiation time of 110 s to form a pretilt angle. 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 into a test box with a vertical orientation for performance testing. Referring to the method of Example 1, a pretilt angle was formed. 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]

[0155] Example 3: A mixture M3 was prepared according to the compounds and weight percentages listed in Table 5, and filled into a test box with a vertical orientation for performance testing. Referring to the method of Example 1, a pretilt angle was formed. The composition and test data of the mixture M3 are shown in Table 5 below.

[0156] Table 5 Composition (weight %) and test performance of the liquid crystal composition of Example 3

[0157]

[0158] Example 4: A mixture M4 was prepared according to the compounds and weight percentages listed in Table 6, and filled into a test box with a vertical orientation for performance testing. Referring to the method of Example 1, a pretilt angle was formed. The composition and test data of the mixture M4 are shown in Table 6 below.

[0159] Table 6 Composition (weight %) and test performance of the liquid crystal composition of Example 4

[0160]

[0161]

[0162] Example 5: A mixture M5 was prepared according to the compounds and weight percentages listed in Table 7, and filled into a test box with a vertical orientation for performance testing. Referring to the method of Example 1, a pretilt angle was formed. The composition and test data of the mixture M5 are shown in Table 7 below.

[0163] Table 7 Composition (wt%) and test performance of the liquid crystal composition of Example 5

[0164]

[0165] Example 6: A mixture M6 was prepared according to the compounds and weight percentages listed in Table 8, and filled into a test box with a vertical orientation for performance testing. Referring to the method of Example 1, a pretilt angle was formed. The composition and test data of the mixture M6 are shown in Table 8 below.

[0166] Table 8 Composition (weight %) and test performance of the liquid crystal composition of Example 6

[0167]

[0168] Example 7: A mixture M7 was prepared according to the compounds and weight percentages listed in Table 9, and filled into a test box with a vertical orientation for performance testing. Referring to the method of Example 1, a pretilt angle was formed. The composition and test data of the mixture M7 are shown in Table 9 below.

[0169] Table 9 Composition (weight %) and test performance of the liquid crystal composition of Example 7

[0170]

[0171] To the above mixture, an additional 400 ppm of additives were added:

[0172]

[0173] Example 8: A mixture M8 was prepared according to the compounds and weight percentages listed in Table 10, and filled into a test box with a vertical orientation for performance testing. Referring to the method of Example 1, a pretilt angle was formed. The composition and test data of the mixture M8 are shown in Table 10 below.

[0174] Table 10 Composition (weight %) and test performance of the liquid crystal composition of Example 8

[0175]

[0176] 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| ratio, having higher transmittance and contrast. Through Examples 1-8, the liquid crystal composition of the present invention has good low-temperature storage stability, lower rotational viscosity, and can reduce the response time of the liquid crystal display.

[0177] The prepared PSVA mixture has good pre-tilt angle forming ability, and the liquid crystal composition of the invention has good low-temperature storage stability and low rotational viscosity, and can reduce the response time of the liquid crystal display.

[0178] 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 liquid crystal composition, characterized in that: Containing at least one dielectrically negative compound M, compound M is selected from one or more of compounds MD to ME, and one or more of compounds MA to MC, MF to ML: 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 G: Among them, rings B1 and B2 are independently represented One or more H on the molecule may be replaced by F; R B1 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; R B2 represents F, Cl, CF3 or -OCF3; L B1 , L B2 Each independently represents F or H; Z2 represents a CC single bond or -CH2CH2-; a represents 0 or 1; At least one compound of formula I: 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 represented independently and At most one H on can be replaced by F; b represents 0, 1 or 2. When b represents 2, the ring C2 may be the same or different; c represents 0 or 1; At least one compound represented by the general formula P: Wherein, Ring A1, Ring A2, and Ring A3 are each independently represented by 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 polymerizable group, and the polymerizable group is 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; d and e are each independently an integer from 0 to 4; And at least one compound of general formula II: 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.

2. The liquid crystal composition according to claim 1, characterized in that: The compound of general formula I is selected from one or more compounds represented by general formula IA to general formula IH:

3. The liquid crystal composition according to claim 1, characterized in that: The compound of general formula G is selected from one or more compounds represented by general formulae G-1 to G-14:

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

5. The 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 general formula G is 1-20%, the content of the compound represented by general formula M is 40-76%, the content of the compound represented by general formula I is 1-50%, the content of the compound represented by general formula P is 0.1-3%, and the weight percentage of the compound represented by general formula II is 1%-57.9%.

6. The liquid crystal composition according to any one of claims 1 to 5, characterized in that: The liquid crystal composition further comprises one or more chiral agents, and the content of the chiral agents accounts for 0-5% by mass of the entire liquid crystal composition.

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

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

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