A dielectric negative liquid crystal composition and display device thereof

Abstract

The present invention relates to a dielectric negative 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 represented by general formula I: at least one dielectric negative compound represented by general formula M: at least one compound represented by general formula G: and at least one compound represented by general formula II: The liquid crystal composition of the present invention has a large vertical dielectric constant and a large parallel dielectric constant, high storage capacitance, good transmittance, good low temperature performance, and fast response time. The liquid crystal composition of the present invention has a large ε⊥ / |Δε ratio, low rotational viscosity, fast response time, and has good pre-tilt angle forming ability when applied to PSVA.

Description

Technical Field

[0001] The invention relates to a liquid crystal composition and application, in particular to a dielectric 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] 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, which makes the liquid crystal storage capacitance small and the liquid crystal transmittance low. At the same time, the response time of negative liquid crystal displays is generally slow. In addition, for PSVA type liquid crystal displays, it is hoped that they have good pre-tilt angle forming ability. Therefore, it is necessary to provide a liquid crystal material with large dielectric, fast response and stable low temperature performance, which has good pre-tilt angle forming ability when applied to PSVA type displays. Summary of the invention

[0004] In view of the problems existing in the prior art, in order to improve the small parallel dielectric constant ε∥ and vertical dielectric constant ε⊥ of negative liquid crystal, resulting in small liquid crystal storage capacitance, low liquid crystal transmittance, and slow response time of negative liquid crystal display, the present invention discloses a negative liquid crystal composition, which has a negative dielectric constant, comprises a dibenzofuran / thiophene component, a positive component, a bicyclohexane derivative, and comprises a negative component and a positive component at the same time, but the overall dielectric is negative. The material has a large dielectric constant, a rapid response, and stable low temperature performance.

[0005] The liquid crystal composition of the present invention comprises a dibenzofuran / thiophene component and a bicyclohexane compound. Such a 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 the components, thereby improving low-temperature performance.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A dielectric negative liquid crystal composition, comprising: at least one dielectric negative compound represented by general formula I as a first component:

[0008]

[0009] Among them, R11 , R 12 Each independently represents an alkyl group of 1 to 12 carbon atoms, an alkoxy group of 1 to 12 carbon atoms, an alkenyl group of 2 to 12 carbon atoms, or a cycloalkyl group of 3 to 8 carbon atoms, one or more carbon atoms in the cycloalkyl group may be substituted by an oxygen atom, and one or more C—C single bonds in the cycloalkyl group may be substituted by a C═C double bond;

[0010] Ring A1 represents

[0011] Z 11 represents a CC single bond, -CH2CH2-, -CF2O-, -OCF2-, -CH2O-, -OCH2-, -CO-O-, -C2F4-, or -CF=CF-;

[0012] X represents O or S;

[0013] a represents 0, 1 or 2;

[0014] Contains at least one dielectric negative compound represented by the general formula M as the second component:

[0015]

[0016] 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, M2, and M3 each independently represent

[0017] Z M1 , Z M2 Each independently represents a CC single bond, -CH2CH2-, -CF2O-, -OCF2-, -CH2O-, -OCH2-, -CO-O-, -C2F4-, or -CF=CF-;

[0018] b and c represent 0, 1 or 2;

[0019] It also contains at least one compound represented by the general formula G as a third component:

[0020]

[0021] Among them, rings B1 and B2 are independent of each other. One or more H on the molecule may be replaced by F;

[0022] 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;

[0023] R B2 represents F, Cl, CF3 or -OCF3;

[0024] L B1 , L B2 Each independently represents F or H;

[0025] Z2 represents a CC single bond or -CH2CH2-;

[0026] d represents 0 or 1;

[0027] And at least one compound of general formula II as the fourth component:

[0028]

[0029] 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.

[0030] Furthermore, the compound represented by general formula I is selected from one or more of the following groups of compounds:

[0031]

[0032] Here, m and n each independently represent an integer of 1-6.

[0033] Furthermore, the compound of general formula I is selected from a combination of compounds represented by any two or more of general formulae I-1, I-3, I-4, I-6, I-9 and I-12.

[0034] Further, the general formula I can be selected from at least one compound of the general formula I-1 and at least one compound of the general formula I-9;

[0035] Further, the general formula I can be selected from at least one compound of the general formula I-6 and at least one compound of the general formula I-9;

[0036] Further, the general formula I can be selected from at least one compound of the general formula I-3 and at least one compound of the general formula I-12;

[0037] Furthermore, the compound of formula I can be selected from at least one compound of formula I-4 and at least one compound of formula I-12.

[0038] Relative to the total weight of the liquid crystal composition of the present invention, the weight percentage of the compound of formula I is 1%-20%, preferably 1.5%-20%, 2%-18%, 3%-16%, 4%-15%, 5%-14%, 6%-12% or 7%-20%. 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 I is 1%, 1.5%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, or 9%; the upper limit of the weight percentage of the compound of formula I is 20%, 18%, 16%, 15%, 14%, 12% or 10%.

[0039] Furthermore, the compound represented by the general formula M is selected from one or more of the compounds represented by the following general formulae MA to ML:

[0040]

[0041] 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.

[0042] 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, MF, MG, MJ and ML.

[0043] 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;

[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 MC, at least one compound of ME and at least one compound of MJ;

[0045] Further, the general formula M may be selected from 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 the general formula MJ;

[0046] 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 ME and at least one compound of MF;

[0047] 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 ME, at least one compound of MJ and at least one compound of ML;

[0048] Further, the general formula M may be selected from at least one compound of the general formula MB, at least one compound of the general formula MC, at least one compound of MD and at least one compound of ME;

[0049] Further, the general formula M may be selected from at least one compound of the general formula MB, at least one compound of the general formula MC, at least one compound of MF and at least one compound of MG;

[0050] Further, the general formula M can be selected from at least one compound of the general formula MB, at least one compound of the general formula MC, at least one compound of ME, at least one compound of MG and at least one compound of ML.

[0051] In some embodiments of the present invention, the compound of formula M is selected from one or more of the following compounds:

[0052]

[0053]

[0054]

[0055]

[0056]

[0057] Relative to the total weight of the liquid crystal composition of the present invention, the weight percentage of the compound of the general formula M is 40%-70%, preferably 41%-69%, 42%-66%, 43%-64%, 44%-62%, 45%-60% or 46%-58%. 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 M is 40%, 41%, 42%, 43%, 44%, 45%, 46%; the upper limit of the weight percentage of the compound of the general formula M is 70%, 69%, 66%, 64%, 62%, 60%, 58%, 56%, 54%, 52% or 50%.

[0058] Furthermore, the compound of general formula G is selected from one or more compounds represented by the following general formulae G-1 to G-14:

[0059]

[0060] 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.

[0061] 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.

[0062] 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-6;

[0063] 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-7;

[0064] 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-7;

[0065] 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.

[0066] Relative to the total weight of the liquid crystal composition of the present invention, the weight percentage of the compound of 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 formula G is 1%, 1.5%, 2%, 3%, 4%, 5%, 6%, 7%, 8% or 9%; the upper limit of the weight percentage of the compound of formula G is 20%, 18%, 16%, 15%, 14%, 12% or 10%.

[0067] In some embodiments of the present invention, preferably, the compound represented by the general formula II is one or more compounds selected from the group consisting of the following compounds II-1 to II-19:

[0068]

[0069]

[0070] 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.

[0071] 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;

[0072] Further, the general formula II can be selected from at least one compound of formula II-18 and at least one compound of formula II-19;

[0073] 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;

[0074] Furthermore, 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.

[0075] 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%, further preferably 1%-58%, 1%-57%, 1%-56%, 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%.

[0076] In the liquid crystal composition, calculated by mass percentage, the content of the compound represented by general formula I is 1-20%, the content of the compound represented by general formula G is 1-20%, the content of the compound represented by general formula M is 40-70%, and the content of the compound represented by general formula II is 1-58%.

[0077] In some embodiments of the present invention, one or more compounds of formula III may be added:

[0078]

[0079] 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;

[0080] Rings C1, C2, and C3 are each independently low and At most one H on can be replaced by F;

[0081] e represents 0, 1, 2. When e represents 2, the ring C2 may be the same or different;

[0082] f represents 0 or 1.

[0083] Furthermore, the compound of general formula III is selected from one or more of the compounds represented by the following general formulae III-A to III-H:

[0084]

[0085] 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.

[0086] Furthermore, the liquid crystal compound represented by the general formula III is selected from a combination of compounds represented by any two or more of the general formulae III-A, III-B, III-C, III-D and III-E.

[0087] Further, the general formula III is selected from at least one compound of the general formula III-A and at least one compound of the general formula III-C;

[0088] Further, the general formula III is selected from at least one compound of the general formula III-B and at least one compound of the general formula III-D;

[0089] Further, the general formula III is selected from at least one compound of the general formula III-B and at least one compound of the general formula III-C;

[0090] Further, the general formula III is selected from at least one compound of the general formula III-B and at least one compound of the general formula III-D;

[0091] Further, Formula III is selected from at least one compound of Formula III-D and at least one compound of Formula III-E;

[0092] Further, the general formula III is selected from at least one compound of the general formula III-A, at least one compound of the general formula III-D and at least one compound of the general formula III-E.

[0093] In some embodiments of the present invention, preferably, the compound of formula III is one or more compounds selected from the group consisting of the following compounds III-1 to III-68:

[0094]

[0095]

[0096]

[0097] Relative to the total weight of the liquid crystal composition of the present invention, the weight percentage of the compound of general formula III is 1%-60%, preferably 1-57%, 1-56%, 1-55%, 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 III 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 III is 60%, 58%, 56%, 54%, 52%, 50%, 48%, 45%, 40%, 38%, 35%, 30%, 28%, 26%, 24%, 20%, 18%, 16%, 15%, 14%, 12% or 10%.

[0098] In some embodiments of the present invention, one or more compounds of the general formula P may also be added:

[0099]

[0100] Wherein, ring D1, ring D2, and ring D3 are each independently represented by Said One or more H on the may be replaced by -F, -Cl or -OCH3;

[0101] Z1 and Z2 each independently represent a carbon-carbon single bond, -CH2CH2-, -CH=CH-, -CF2O-, -OCF2-, -CH2O-, -OCH2-, -CO-O-, CF2CF2- or -CF=CF-;

[0102] P1 and P2 each independently represent a polymerizable group, and the polymerizable group is a methacrylate group or an acrylate group;

[0103] 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;

[0104] g and h are each independently an integer of 0-4.

[0105] Further: the compound represented by the general formula P is selected from one or more compounds represented by the general formulae PA to PK:

[0106]

[0107]

[0108] Wherein, Sp2 represents a spacer group or a single bond. The spacer group is defined as a straight or branched alkyl chain group of 1 to 6 carbon atoms, and P1 and P2 each independently represent a methacrylate group or an acrylate group.

[0109] 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.

[0110] 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.

[0111] Further, the general formula P can be selected from at least one compound of the general formula PA, at least one compound of the general formula PF;

[0112] Further, the general formula P can be selected from at least one compound of the general formula PB, at least one compound of the general formula PF;

[0113] Further, the general formula P can be selected from at least one compound of the general formula PD, at least one compound of the general formula PF;

[0114] Further, the general formula P can be selected from at least one compound of the general formula PG, at least one compound of the general formula PF;

[0115] Further, the general formula P can be selected from at least one compound of the general formula PE, at least one compound of the general formula PF;

[0116] Furthermore, 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.

[0117] Furthermore, the compound represented by the general formula P is selected from one or more of the following compounds P-1 to P-50:

[0118]

[0119]

[0120]

[0121]

[0122] In the present invention, the weight percentage of the compound represented by the general formula P in the liquid crystal composition is 0.001% to 3%, for example, 0.005%, 0.01%, 0.05%, 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%.

[0123] 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.

[0124] For example, one or more chiral agents having the following structures may be added to the liquid crystal mixture of the present invention:

[0125]

[0126]

[0127] as well as

[0128]

[0129] 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:

[0130]

[0131]

[0132]

[0133]

[0134] Preferably, the stabilizer is selected from one or more stabilizers having the following structures:

[0135]

[0136] 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. Specific examples are as follows:

[0137]

[0138] 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.

[0139] The dielectric negative liquid crystal composition of the present invention has a Δε less than or equal to -2.5 when measured at 25° C. The negative liquid crystal composition of the present invention can be used in the preparation of liquid crystal display devices.

[0140] A liquid crystal display device comprising the dielectric negative liquid crystal composition of the present invention, wherein the display device comprises VA, MVA, PVA, PSVA, IPS and FFS mode liquid crystal display devices.

[0141] Advantages of the present invention:

[0142] The liquid crystal composition of the present invention has large vertical dielectric and parallel dielectric properties, high storage capacitance, good transmittance, good low-temperature performance and fast response time.

[0143] The present invention uses a dibenzofuran / thiophene derivative with a large vertical dielectric to provide a large vertical dielectric, uses a positive monomer to provide a parallel dielectric, and uses a dicyclohexane monomer to reduce the viscosity of the system. The obtained liquid crystal composition has a large vertical dielectric and a large parallel dielectric. The liquid crystal composition of the present invention has a large ε⊥ / |Δε ratio, low rotational viscosity, fast response time, and has good pre-tilt angle forming ability when applied to PSVA. DETAILED DESCRIPTION

[0144] 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.

[0145] Table 1 Group structure codes of liquid crystal compounds

[0146]

[0147]

[0148] Take the following compound as an example:

[0149]

[0150] Expressed using the code in Table 1, it is 3PGP2.

[0151] Another example:

[0152]

[0153] Expressed as 3PGUQUF.

[0154] The abbreviated codes for the test items in the following embodiments are as follows:

[0155] Cp (℃): clearing point (nematic-isotropic phase transition temperature);

[0156] Δn: refractive index anisotropy (589nm, 25℃);

[0157] Δε: dielectric anisotropy (1KHz, 25℃);

[0158] 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;

[0159] 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%;

[0160] γ1: represents the rotational viscosity [mPa·s] measured at 25°C, which is measured by the rotation method in a magnetic field;

[0161] LTS: Low temperature storage stability, the liquid crystal mixture is stored in a glass bottle under low temperature conditions.

[0162] K11: splay elastic constant;

[0163] K33: Bending elastic constant.

[0164] VHR: Voltage holding ratio. Liquid crystal is filled between two glass substrates and measured with TOYO LCM-2. The higher the voltage holding ratio, the fewer mobile ions in the liquid crystal display component, and the better the stability of the liquid crystal display component.

[0165] 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.

[0166] Table 2 Composition (wt%) and test performance of the liquid crystal composition of Example 1

[0167]

[0168] 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.

[0169] Table 3 Composition (weight %) and test performance of the liquid crystal composition of Comparative Example 1

[0170]

[0171] 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.

[0172] Table 4 Composition (weight %) and test performance of the liquid crystal composition of Example 2

[0173]

[0174]

[0175] 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.

[0176] Table 5 Composition (weight %) and test performance of the liquid crystal composition of Example 3

[0177]

[0178] 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.

[0179] Table 6 Composition (weight %) and test performance of the liquid crystal composition of Example 4

[0180]

[0181]

[0182] 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.

[0183] Table 7 Composition (wt%) and test performance of the liquid crystal composition of Example 5

[0184]

[0185] 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.

[0186] Table 8 Composition (weight %) and test performance of the liquid crystal composition of Example 6

[0187]

[0188]

[0189] 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.

[0190] Table 9 Composition (weight %) and test performance of the liquid crystal composition of Example 7

[0191]

[0192] To the above mixture, an additional 400 ppm of additives were added:

[0193]

[0194] 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.

[0195] Table 10 Composition (weight %) and test performance of the liquid crystal composition of Example 8

[0196]

[0197]

[0198] Example 9: To prepare a PSVA mixture, the polymerizable compound P-1 was mixed with the mixture M1 in Example 1 in the following proportions to obtain a mixture PSA-1, which was filled in a test box with a vertical orientation. After applying a voltage of 18 V, a UV light with a wavelength of 313 nm at 5 mW / cm 2 The box is irradiated with a power of 100 s for 110 s to form a pretilt angle.

[0199] Table 11 Composition (wt%) and pretilt angle of liquid crystal mixture PSA-1

[0200]

[0201] Comparative Example 2: To prepare a PSVA mixture, the polymerizable compound P-1 was mixed with the mixture D1 in Comparative Example 1 in the following proportions to obtain a mixture PSA-D1, which was filled in a test box with a vertical orientation. After applying a voltage of 18 V, a UV light with a wavelength of 313 nm at 5 mW / cm 2 The box is irradiated with a power of 100 s for 110 s to form a pretilt angle.

[0202] Table 12 Composition (wt%) and pretilt angle of liquid crystal mixture PSA-D1

[0203]

[0204] Example 10: To prepare a PSVA mixture, the polymerizable compound P-11 was mixed with the mixture M2 in Example 2 in the following proportions to obtain a mixture PSA-2, which was filled in a test box with a vertical orientation. After applying a voltage of 18 V, a UV light with a wavelength of 313 nm at a power of 5 mW / cm 2 The box is irradiated with a power of 100 s for 110 s to form a pretilt angle.

[0205] Table 13 Composition (wt%) and pretilt angle of liquid crystal mixture PSA-2

[0206]

[0207] Example 11: To prepare a PSVA mixture, the polymerizable compound P-18 was mixed with the mixture M5 in Example 5 in the following proportions to obtain a mixture PSA-3, which was filled in a test box with a vertical orientation. After applying a voltage of 18 V, a UV light with a wavelength of 313 nm was used at a power of 5 mW / cm 2 The box is irradiated with a power of 100 s for 110 s to form a pretilt angle.

[0208] Table 14 Composition (weight %) and pretilt angle of liquid crystal mixture PSA-3

[0209]

[0210] It can be seen from the above examples and comparative examples 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, with higher transmittance and contrast.

[0211] 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.

Claims

1. A dielectric negative liquid crystal composition, characterized in that: Contains at least one dielectric negative compound represented by general formula I: Among them, R 11 , R 12 Each independently represents an alkyl group of 1 to 12 carbon atoms, an alkoxy group of 1 to 12 carbon atoms, an alkenyl group of 2 to 12 carbon atoms, or a cycloalkyl group of 3 to 8 carbon atoms, one or more carbon atoms in the cycloalkyl group may be substituted by an oxygen atom, and one or more C—C single bonds in the cycloalkyl group may be substituted by a C═C double bond; Ring A1 represents Z 11 represents a CC single bond, -CH2CH2-, -CF2O-, -OCF2-, -CH2O-, -OCH2-, -CO-O-, -C2F4-, or -CF=CF-; X represents O or S; a represents 0, 1 or 2; At least one dielectrically negative compound represented by the general formula M: 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; Rings M1, M2, and M3 are represented independently Z M1 , Z M2 Each independently represents a CC single bond, -CH2CH2-, -CF2O-, -OCF2-, -CH2O-, -OCH2-, -CO-O-, -C2F4-, or -CF=CF-; b and c represent 0, 1 or 2; At least one compound represented by the general formula G, wherein the compound of the general formula G is selected from one or more compounds represented by the general formulas G-1 to G-12 and G-14: Among them, 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; 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 dielectric negative liquid crystal composition according to claim 1, characterized in that: The compound represented by general formula I is selected from one or more of the following groups of compounds: Here, m and n each independently represent an integer of 1-6.

3. The dielectric negative liquid crystal composition according to claim 1, characterized in that: The compound represented by the general formula M is selected from one or more compounds represented by the general formulae MA to ML:

4. The dielectric 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 general formula I is 1-20%, the content of the compound represented by general formula G is 1-20%, the content of the compound represented by general formula M is 40-70%, and the content of the compound represented by general formula II is 1-58%.

5. The dielectric negative liquid crystal composition according to claim 1, characterized in that: It also contains one or more compounds of formula III: 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; e represents 0, 1, 2, when c represents 2, the ring C2 may be the same or different; f represents 0 or 1; The weight percentage of the compound of formula III is 1%-60%.

6. The dielectric negative liquid crystal composition according to claim 1, characterized in that: It also contains one or more compounds represented by the general formula P: Wherein, ring D1, ring D2, and ring D3 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; g and h are each independently an integer from 0 to 4; The weight percentage of the compound represented by the general formula P in the liquid crystal composition is 0.001% to 3%.

7. The dielectric negative liquid crystal composition according to any one of claims 1 to 6, 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.

8. The dielectric negative liquid crystal composition according to any one of claims 1 to 6, characterized in that: One or more stabilizers are also added to the liquid crystal mixture, and the content of the stabilizer is 0-5%.

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

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