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 liquid crystal composition comprises at least one compound having a structure represented by General Formula I: at least one dielectric negative compound M, and the compound M is selected from the compounds represented by General Formula M-I and / or M-II: at least one compound represented by General Formula II: and at least one compound represented by General Formula III: The liquid crystal composition of the present invention has a very low rotational viscosity, a short response time, good phase properties and good low-temperature properties. The obtained liquid crystal composition can effectively improve the response speed of a liquid crystal display when used in a liquid crystal display device. The obtained liquid crystal composition has a low residual DC voltage, and can reduce the risk of image sticking caused by the residual DC voltage when used in a liquid crystal display device.

Description

Technical Field

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

[0002] These liquid crystal display elements prepared by utilizing the refractive index anisotropy, dielectric anisotropy, etc. of liquid crystal compounds are widely used in display devices such as televisions and monitors. Among them, negative liquid crystal displays are widely 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 those for e-sports still have an increasing demand for display time. Compared with lower refresh rates, high refresh rates have some advantages in motion clarity, but the response time is too slow to meet the requirements of high refresh rate displays. Therefore, the need to improve the response time is still very urgent. In addition, performance such as good low-temperature stability must be maintained, so it is necessary to provide a liquid crystal material with rapid response and stable low-temperature performance.

[0003] For liquid crystal displays, it is also required that the liquid crystal material has a low residual DC voltage to improve image sticking.

[0004] The performance of liquid crystal materials is determined by multiple factors, involving the refractive index, dielectric constant, rotational viscosity, etc. of liquid crystal materials. These characteristics affect and restrict each other, and it is difficult to change only one parameter without changing other performances. Therefore, multiple factors need to be considered during the development of liquid crystals.

[0005] The properties in liquid crystal materials will affect the properties of liquid crystal displays. The presence of DC voltage and the action of impurities in liquid crystals easily form residual DC voltage, and the effect manifested on liquid crystal displays is the formation of image sticking. Currently, the problem of large residual DC voltage and image sticking still easily occurs in negative liquid crystal compositions. Therefore, it is still necessary to develop a negative liquid crystal composition with a small residual DC voltage and not easily forming image sticking. Summary of the Invention

[0006] Aiming at the problems existing in the prior art, in order to improve the slow response speed and poor low-temperature stability of negative liquid crystal materials, the present invention has developed a negative liquid crystal composition, which includes negative liquid crystal compound I, negative liquid crystal compound M, neutral compound II, and dicyclohexane compound III. Such a liquid crystal composition has a low rotational viscosity when used as a liquid crystal material, can shorten the response time, and at the same time, the components have good mutual solubility and improve the low-temperature performance.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A negative liquid crystal composition comprising: at least one compound having a structure represented by General Formula I as a first component:

[0009]

[0010] Wherein, R A1 , R A2 each independently represents an alkyl group having 1 to 12 carbon atoms or an alkenyl group having 2 to 12 carbon atoms;

[0011] L1 and L2 each independently represent H or -CH3;

[0012] Z1 represents -CH2O- or -OCH2-;

[0013] a represents 0 or 1; b represents 1 or 2;

[0014] at least one dielectric negative compound M as a second component, and the compound M is selected from the compounds represented by the following General Formulas M-I and / or M-II:

[0015]

[0016] Wherein, 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; the rings M1 and M2 each independently represent

[0017] Z M represents a C-C single bond, -CH2CH2-, -CF2O-, -OCF2-, -CH2O-, -OCH2-, -CO-O-, -C2F4-, or -CF=CF-;

[0018] m represents 0, 1 or 2;

[0019] at least one compound having a structure represented by General Formula II as a third component:

[0020]

[0021] Wherein, 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;

[0022] the rings C1, C2, and C3 each independently represent And at most one H on can be substituted by F;

[0023] c represents 0, 1, 2, and when c represents 2, the rings C2 can be the same or different;

[0024] d represents 0 or 1;

[0025] and at least one compound represented by General Formula III:

[0026]

[0027] wherein, 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.

[0028] The liquid crystal compound represented by General Formula I is preferably a compound represented by Structural Formulas I-A to I-J below:

[0029]

[0030] wherein, R A1 , R A2 each independently represents an alkyl group having 1 to 12 carbon atoms, or an alkenyl group having 2 to 12 carbon atoms.

[0031] Furthermore, the liquid crystal compound represented by General Formula I is selected from at least one compound represented by General Formula I-A, and at least one compound represented by General Formulas I-B, I-C, I-F, and / or I-H.

[0032] Furthermore, General Formula I can be selected from at least one compound of General Formula I-A and at least one compound of General Formula I-B;

[0033] Furthermore, General Formula I can be selected from at least one compound of General Formula I-A and at least one compound of General Formula I-C;

[0034] Furthermore, General Formula I can be selected from at least one compound of General Formula I-A and at least one compound of General Formula I-H;

[0035] Furthermore, General Formula I can be selected from at least one compound of General Formula I-A and at least one compound of General Formula I-F.

[0036] In some embodiments of the present invention, preferably, the compound represented by General Formula I is selected from one or more of the group consisting of the following Compounds I-1 to I-64:

[0037]

[0038]

[0039]

[0040] Based on the total weight of the liquid crystal composition of the present invention, the weight percentage of the compound of general formula I is 1% - 60%, preferably 1% - 58%, 1% - 50%, 1% - 48%, 2% - 50%, 2% - 48%, 3% - 48%, 3% - 45% or 4% - 45%. Based on the total weight of the liquid crystal composition of the present invention, the lower limit value 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 value 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%.

[0041] In some embodiments of the present invention, the compound of general formula M is selected from one or more of the compounds represented by the following general formulas M-A to M-L:

[0042]

[0043] Wherein, RM1 and RM2 each independently represent an alkyl group having 1 - 12 carbon atoms or an alkoxy group having 1 - 12 carbon atoms.

[0044] Furthermore, the compound represented by general formula M is selected from a combination of any two, three or more than four general formulas among general formulas M-A, M-B, M-C, M-D, M-E and M-J.

[0045] Furthermore, general formula M can be selected from at least one compound of general formula M-B, at least one compound of general formula M-C and at least one compound of M-J;

[0046] Furthermore, general formula M can be selected from at least one compound of general formula M-A, at least one compound of general formula M-C, at least one compound of M-F and at least one compound of M-J;

[0047] Furthermore, general formula M can be selected from at least one compound of general formula M-A, at least one compound of M-C and at least one compound of general formula M-J;

[0048] Furthermore, general formula M can be selected from at least one compound of general formula M-C and at least one compound of general formula M-E;

[0049] Furthermore, general formula M can be selected from at least one compound of general formula M-B, at least one compound of general formula M-C, at least one compound of M-D and at least one compound of M-E;

[0050] Further, the general formula M can be selected from at least one compound of general formula M-C, at least one compound of general formula M-D, and at least one compound of M-J;

[0051] Further, the general formula M can be selected from at least one compound of general formula M-C and at least one compound of general formula M-D;

[0052] Further, the general formula M can be selected from at least one compound of general formula M-A, at least one compound of general formula M-B, at least one compound of M-C, and at least one compound of M-J.

[0053] Preferably, the compound represented by the general formula M is selected from one or more of the compounds M-1 to M-96:

[0054]

[0055]

[0056]

[0057]

[0058] Relative to the total weight of the liquid crystal composition of the present invention, the weight percentage of the compound of general formula M is 1% - 60%, preferably 1% - 58%, 1% - 50%, 1% - 48%, 1% - 45%, 2% - 50%, 2% - 45%, or 3% - 40%. Relative to the total weight of the liquid crystal composition of the present invention, the lower limit value of the weight percentage of the compound of general formula M is 1%, 1.5%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 14%, 16%, 20%, 22%, 24%, or 26%; the upper limit value of the weight percentage of the compound of general formula M is 50%, 48%, 45%, 40%, 38%, 35%, 30%, 28%, 26%, 24%, 20%, 18%, 16%, 15%, 14%, 12%, or 10%.

[0059] In some embodiments of the present invention, preferably the compound of general formula II is selected from one or more of the compounds represented by general formula II-A to II-H:

[0060]

[0061] Wherein, R C1 , R C2 each independently represents an alkyl group having 1 - 12 carbon atoms, an alkoxy group having 1 - 12 carbon atoms, or an alkenyl group having 2 - 12 carbon atoms.

[0062] Further, the compound represented by General Formula II is selected from a combination of any two or more compounds represented by General Formulae II-A, II-B, II-C, II-D, and II-F.

[0063] Further, General Formula II is selected from at least one compound of General Formula II-A and at least one compound of General Formula II-B;

[0064] Further, General Formula II is selected from at least one compound of General Formula II-A and at least one compound of General Formula II-D;

[0065] Further, General Formula II is selected from at least one compound of General Formula II-B and at least one compound of General Formula II-C;

[0066] Further, General Formula II is selected from at least one compound of General Formula II-B and at least one compound of General Formula II-D;

[0067] Further, General Formula II is selected from at least one compound of General Formula II-B, at least one compound of General Formula II-D, and at least one compound of General Formula F;

[0068] Further, General Formula II is selected from at least one compound of General Formula II-A, at least one compound of General Formula II-C, and at least one compound of General Formula D;

[0069] Further, General Formula II is selected from at least one compound of General Formula II-B, at least one compound of General Formula II-C, and at least one compound of General Formula D;

[0070] Further, General Formula II is selected from at least one compound of General Formula II-A, at least one compound of General Formula II-B, at least one compound of General Formula C, and at least one compound of II-D.

[0071] In some embodiments of the present invention, preferably, the compound of General Formula II is selected from one or more compounds consisting of the following compounds II-1 to II-68:

[0072]

[0073]

[0074]

[0075] Based on 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 - 58%, 1 - 56%, 1 - 54%, 1% - 50%, 1% - 48%, 2% - 60%, 2% - 50%, 3% - 60%, 3% - 52% or 4% - 48%. Based on the total weight of the liquid crystal composition of the present invention, the lower limit value 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 value 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 some embodiments of the present invention, preferably, the compound of general formula III is selected from one or more compounds consisting of the following compounds III-1 to III-18:

[0077]

[0078] Based on 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 - 58%, 1 - 56%, 1 - 54%, 1% - 50%, 1% - 48%, 2% - 60%, 2% - 50%, 3% - 60%, 3% - 52% or 4% - 48%. Based on the total weight of the liquid crystal composition of the present invention, the lower limit value 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 value 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%.

[0079] In the described liquid crystal composition, calculated by mass percentage, the content of the compound represented by general formula I is 1 - 60%, the content of the compound represented by general formula M is 1 - 60%, the content of the compound represented by general formula II is 1 - 50%, and the content of the compound represented by general formula III is 1 - 60%.

[0080] In some aspects of the present invention, in the described liquid crystal composition, one or more compounds having the structure of general formula IV may further be included:

[0081]

[0082] Among them, R G1 and R G2 each independently represents an alkyl group having 1 to C 12 or an alkoxy group having 1 to C 12 ; at least one hydrogen atom in the alkyl group having 1 to C 12 and the alkoxy group having 1 to C 12 can also be independently substituted by a halogen atom; or, one -CH2- or at least two non - adjacent -CH2- in the alkyl group having 1 to C 12 and the alkoxy group having 1 to C 12 can also be independently substituted by -O-, -CH = CH-, -C≡C-, -CO - O- or -O - CO- in a non - directly - connected manner;

[0083] X1 and X2 each independently represent -F or -CF3.

[0084] In some embodiments of the present invention, the compound represented by the general formula IV is selected from one or more of the following compounds IV - 1 to IV - 40:

[0085]

[0086]

[0087]

[0088] In some embodiments of the present invention, the compound of the general formula IV accounts for 0.1 - 20% of the total weight of the liquid crystal composition, such as 1%, 2%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, etc. Further preferably, the compound of the general formula IV accounts for 1 - 20% of the total weight of the liquid crystal composition, and is preferably 3 - 20%.

[0089] In the described liquid crystal composition, one or more compounds represented by the following general formula V can also be included:

[0090]

[0091] Among them, R 51 and R 52 each independently represents an alkyl group having 1 to C 12 or an alkoxy group having 1 to C 12 ; at least one hydrogen atom in the alkyl group having 1 to C 12 and the alkoxy group having 1 to C 12 can also be independently substituted by a halogen atom; or, the C1 - C 12An alkyl group, C1-C 12 One -CH2- or at least two non - adjacent -CH2- in the alkoxy group of can also be independently replaced by -O-, -CH=CH-, -C≡C-, -CO - O- or -O - CO- in a non - directly - connected manner;

[0092] Ring E1, E2, E3 each independently represent

[0093] Z 51 Represents -CH2CH2-, -CF2O-, -OCF2-, -CH2O-, -OCH2-, -CO - O-, -C2F4-, or -CF=CF-;

[0094] q represents 0 or 1.

[0095] Furthermore, the compound of general formula V is selected from one or more of the group consisting of the following compounds V - 1 to V - 7:

[0096]

[0097] In some embodiments of the present invention, the compound of general formula V accounts for 0.1 - 20% of the total weight of the liquid crystal composition, such as 1%, 2%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, etc. Furthermore, the compound of general formula V accounts for 1 - 20% of the total weight of the liquid crystal composition, preferably 3 - 20%.

[0098] 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 stabilizers, etc.

[0099] For example, one or more of the stabilizers with the following structures can be added to the liquid crystal mixture of the present invention:

[0100]

[0101]

[0102]

[0103] Preferably, the stabilizer is selected from one or more of the stabilizers with the following structures:

[0104]

[0105] In the stabilizer, n represents an integer from 1 to 12, for example, n represents 1, 2, 3, 4, 5, 6, 8, 10 or 11, etc. Specific examples are as follows:

[0106]

[0107] In an embodiment of the present invention, preferably, the stabilizer 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.

[0108] On the other hand, the invention provides a liquid crystal composition, which further comprises one or more additives known to those skilled in the art and described in the literature. For example, 0-15% of a polychromatic dye and / or a chiral dopant can be added.

[0109] The following shows the possible dopants preferably added to the mixture according to the present invention:

[0110]

[0111]

[0112] and

[0113]

[0114] In an embodiment of the present invention, preferably, the dopant accounts for 0-5% of the total weight of the liquid crystal composition; more preferably, the dopant accounts for 0-1% of the total weight of the liquid crystal composition.

[0115] A liquid crystal display device comprising the negative liquid crystal composition of the present invention, the display device including VA, MVA, PVA, PSVA, IPS and FFS mode liquid crystal display devices.

[0116] The liquid crystal composition of the present invention can be applied to liquid crystal display devices, preferably applied to VA-type liquid crystal display devices such as VA, MVA, PVA, PSVA, etc. and / or IPS and FFS mode liquid crystal display devices, more preferably applied to MVA, PVA, and PSVA mode liquid crystal displays.

[0117] Advantages of the present invention:

[0118] The compound adopted in the present invention has stable chemical and physical properties, good low-temperature miscibility, low rotational viscosity, large elastic constant, moderate dielectric anisotropy and refractive index anisotropy, and has wide applicability.

[0119] When used as a liquid crystal material, the liquid crystal composition has low rotational viscosity, can shorten the response time, and at the same time, the components have good mutual solubility, improving the low-temperature performance. The residual DC voltage of the product is low, improving the afterimage.

[0120] The liquid crystal composition of the present invention has a very low rotational viscosity, a short response time, good phase properties and good low-temperature properties. The obtained liquid crystal composition can effectively improve the response speed of a liquid crystal display device when used in the liquid crystal display device. The obtained liquid crystal composition has a low residual DC voltage, and can reduce the risk of image sticking caused by the residual DC voltage when used in the liquid crystal display device. Description of the Drawings

[0121] Figure 1 It is the test result of the residual DC voltage of the liquid crystal compositions of Examples 1-2 and Comparative Examples 1-2. Detailed Description of the Invention

[0122] For the sake of easy expression, in the following examples, the group structures of the liquid crystal compositions are represented by the codes listed in Table 1.

[0123] Table 1 Group Structure Codes of Liquid Crystal Compounds

[0124]

[0125]

[0126] Taking the following compound as an example:

[0127]

[0128] Represented by the code in Table 1, it is 3PGP2.

[0129] Another example:

[0130]

[0131] It is represented as 3PGUQUF.

[0132] The following are the abbreviated codes for the test items in the examples: Cp (°C): clearing point (nematic-isotropic phase transition temperature); Δn: refractive index anisotropy (589 nm, 25 °C);

[0133] Δε: dielectric anisotropy (1 kHz, 25 °C);

[0134] Among them, Δε = ε || -ε ⊥ where ε || is the dielectric constant parallel to the molecular axis, and ε ⊥ is the dielectric constant perpendicular to the molecular axis, test conditions: 25 °C, 1 kHz;

[0135] t (ms): response time (25 ± 0.5 °C); The liquid crystal is filled between two glass substrates and measured with LCT-5016;

[0136] t = ton +t off : t on represents the time required for the relative transmittance to change from 10% to 90%, t off represents the time required for the relative transmittance to change from 90% to 10%;

[0137] γ1: represents the rotational viscosity [mPa·s] measured at 25°C, which is measured by the rotational method in a magnetic field;

[0138] LTS: Low-temperature storage stability. The liquid crystal mixture is stored in a glass bottle under low-temperature conditions;

[0139] Pitch: The pitch. After adding a chiral agent to the nematic liquid crystal compound, a liquid crystal with a certain pitch is formed. The measurement method is to fill the liquid crystal between a wedge cell and measure it with a reading microscope.

[0140] Example 1: A mixture M1 was prepared according to the compounds and weight percentages listed in Table 2, and it was filled between two substrates of a liquid crystal display for performance testing. The test data are shown in Table 2 below.

[0141] Table 2 Composition (weight %) and test performance of the liquid crystal composition in Example 1

[0142]

[0143] Comparative Example 1: A mixture D1 was prepared according to the compounds and weight percentages listed in Table 3, and it was filled between two substrates of a liquid crystal display for performance testing. The test data are shown in Table 3 below.

[0144] Table 3 Composition (weight %) and test performance of the liquid crystal composition in Comparative Example 1

[0145]

[0146] Example 2:

[0147] A mixture M2 was prepared according to the compounds and weight percentages listed in Table 4, and it was filled between two substrates of a liquid crystal display for performance testing. The test data are shown in Table 4 below.

[0148] Table 4 Composition (weight %) and test performance of the liquid crystal composition in Example 2

[0149]

[0150]

[0151] Comparative Example 2:

[0152] A mixture D2 was prepared by mixing the compounds listed in Table 5 according to the weight percentages, and it was filled between the two substrates of a liquid crystal display for performance testing. The test data are shown in Table 5 below.

[0153] Table 5 Composition (weight %) and test performance of the liquid crystal composition of Comparative Example 2

[0154]

[0155] Example 3: A mixture M3 was prepared by mixing the compounds listed in Table 6 according to the weight percentages, and it was filled between the two substrates of a liquid crystal display for performance testing. The test data are shown in Table 6 below.

[0156] Table 6 Composition (weight %) and test performance of the liquid crystal composition of Example 3

[0157]

[0158] Example 4: A mixture M4 was prepared by mixing the compounds listed in Table 7 according to the weight percentages, and it was filled between the two substrates of a liquid crystal display for performance testing. The test data are shown in Table 7 below.

[0159] Table 7 Composition (weight %) and test performance of the liquid crystal composition of Example 4

[0160]

[0161]

[0162] Example 5: A mixture M5 was prepared by mixing the compounds listed in Table 8 according to the weight percentages, and it was filled between the two substrates of a liquid crystal display for performance testing. The test data are shown in Table 8 below.

[0163] Table 8 Composition (weight %) and test performance of the liquid crystal composition of Example 5

[0164]

[0165] Example 6: A mixture M6 was prepared by mixing the compounds listed in Table 9 according to the weight percentages, and it was filled between the two substrates of a liquid crystal display for performance testing. The test data are shown in Table 9 below.

[0166] Table 9 Composition (weight %) and test performance of the liquid crystal composition of Example 6

[0167]

[0168]

[0169] Example 7: A mixture M7 was prepared from the compounds and weight percentages listed in Table 10, filled between the two substrates of a liquid crystal display for performance testing, and the test data are shown in Table 10 below.

[0170] Table 10 Composition (wt%) and test performance of the liquid crystal composition of Example 7

[0171]

[0172] In Example 7 above, 300 ppm of the following additives were additionally added:

[0173]

[0174] Example 8: A mixture M8 was prepared from the compounds and weight percentages listed in Table 11, filled between the two substrates of a liquid crystal display for performance testing, and the test data are shown in Table 11 below.

[0175] Table 11 Composition (wt%) and test performance of the liquid crystal composition of Example 8

[0176]

[0177] Example 9: A mixture M9 was prepared from the compounds and weight percentages listed in Table 12, filled between the two substrates of a liquid crystal display for performance testing, and the test data are shown in Table 12 below.

[0178] Table 12 Composition (wt%) and test performance of the liquid crystal composition of Example 9

[0179]

[0180]

[0181] Example 10: A mixture M10 was prepared from the compounds and weight percentages listed in Table 13, filled between the two substrates of a liquid crystal display for performance testing, and the test data are shown in Table 13 below.

[0182] Table 13 Composition (wt%) and test performance of the liquid crystal composition of Example 10

[0183]

[0184] Example 11: A mixture M11 was prepared from the compounds and weight percentages listed in Table 14, filled between the two substrates of a liquid crystal display for performance testing, and the test data are shown in Table 14 below.

[0185] Table 14 Composition (wt%) and test performance of the liquid crystal composition of Example 11

[0186]

[0187]

[0188] Example 12: Compounds and weight percentages listed in Table 15 were formulated into a mixture M12, which was filled between two substrates of a liquid crystal display for performance testing. The test data are shown in Table 15 below.

[0189] Table 15 Composition (weight %) and test performance of the liquid crystal composition of Example 12

[0190]

[0191] Example 13: Compounds and weight percentages listed in Table 16 were formulated into a mixture M13, which was filled between two substrates of a liquid crystal display for performance testing. The test data are shown in Table 16 below.

[0192] Table 16 Composition (weight %) and test performance of the liquid crystal composition of Example 13

[0193]

[0194] An additive AD-32 of 0.04% was additionally added to the above mixture.

[0195] Example 14: Compounds and weight percentages listed in Table 17 were formulated into a mixture M14, which was filled between two substrates of a liquid crystal display for performance testing. The test data are shown in Table 17 below.

[0196] Table 17 Composition (weight %) and test performance of the liquid crystal composition of Example 14

[0197]

[0198]

[0199] Example 15: Compounds and weight percentages listed in Table 18 were formulated into a mixture M15, which was filled between two substrates of a liquid crystal display for performance testing. The test data are shown in Table 18 below.

[0200] Table 18 Composition (weight %) and test performance of the liquid crystal composition of Example 15

[0201]

[0202] Example 16: Compounds and weight percentages listed in Table 19 were formulated into a mixture M16, which was filled between two substrates of a liquid crystal display for performance testing. The test data are shown in Table 19 below.

[0203] Table 19 Composition (wt%) and Test Performance of Liquid Crystal Composition of Example 16

[0204]

[0205] D1, D2, and mixed liquid crystals M1 and M2 were subjected to a residual DC voltage test at 60 °C using a TOYO LCM-2 comprehensive liquid crystal parameter tester. The results are as Figure 1 shown. It can be seen that the mixed liquid crystals M1 and M2 have a low residual DC voltage, and when used in a liquid crystal display device, the risk of image sticking caused by the residual DC voltage can be significantly reduced.

[0206] From the examples and comparative examples, it can be seen that the liquid crystal composition of the present invention is a liquid crystal mixture with a very low rotational viscosity, a short response time, good phase properties, and good low-temperature properties. The obtained liquid crystal composition can effectively improve the response speed of a liquid crystal display device when used in the liquid crystal display device. The obtained liquid crystal composition has a low residual DC voltage, and when used in a liquid crystal display device, the risk of image sticking caused by the residual DC voltage can be reduced.

Claims

1. A negative liquid crystal composition, characterized in that: Comprising at least one compound having the structure shown in General Formula I-A: Among them, R A1 , R A2 each independently represents an alkyl group having 1 to 12 carbon atoms or an alkenyl group having 2 to 12 carbon atoms; At least one dielectric negative compound M, and the compound M is selected from the compounds represented by General Formula M-I and / or M-II: Wherein, R M1 and R M2 each independently represent an alkyl group having 1 to 12 carbon atoms or an alkoxy group having 1 to 12 carbon atoms; The rings M1 and M2 each independently represent Z M represents a C-C single bond, -CH2CH2-, -CF2O-, -OCF2-, -CH2O-, -OCH2-, -CO-O-, -C2F4-, or -CF═CF-; m represents 0, 1 or 2; At least one compound having the structure shown in General Formula II: wherein, 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; Ring C1, C2, C3 each independently represent and at most one H on it may be replaced by F; c represents 0, 1, 2. When c represents 2, the rings C2 may be the same or different; d represents 0 or 1; And at least one compound having the structure shown in General Formula III: Wherein, 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 negative liquid crystal composition according to claim 1, wherein: In the negative liquid crystal composition described above, it further comprises at least one compound represented by General Formula I-B, I-C, I-F and / or I-H, 3. The negative liquid crystal composition according to claim 1, wherein: The compound of General Formula M is selected from one or more of the compounds represented by General Formula M-A to M-L:

4. The negative liquid crystal composition according to claim 1, characterized in that: The compound of General Formula II is selected from one or more of the compounds represented by General Formula II-A to II-H:

5. The negative liquid crystal composition according to claim 1, characterized in that: In the liquid crystal composition described above, calculated by mass percentage, the content of the compound represented by General Formula I is 1-60%, the content of the compound represented by General Formula M is 1-60%, the content of the compound represented by General Formula II is 1-50%, and the content of the compound represented by General Formula III is 1-60%.

6. The negative liquid crystal composition according to claim 1, characterized in that: The liquid crystal composition described above further comprises one or more compounds having the structure shown in General Formula IV: Among them, R G1 and R G2 each independently represents an alkyl group having 1 to 12 carbons or an alkoxy group having 1 to 12 carbons; at least one hydrogen atom in the alkyl group having 1 to 12 carbons or the alkoxy group having 1 to 12 carbons may also be independently substituted by a halogen atom; or, one -CH2- or at least two non-adjacent -CH2- in the alkyl group having 1 to 12 carbons or the alkoxy group having 1 to 12 carbons may also be independently substituted by -O-, -CH=CH-, -C≡C-, -CO-O- or -O-CO- in a non-directly connected manner; X1 and X2 each independently represent -F or -CF3.

7. The negative liquid crystal composition according to claim 1 or 6, characterized in that: The liquid crystal composition described above further comprises one or more compounds having the structure shown in General Formula V: Among them, R 51 and R 52 each independently represents an alkyl group having 1 to 12 carbons or an alkoxy group having 1 to 12 carbons; at least one hydrogen atom in the alkyl group having 1 to 12 carbons or the alkoxy group having 1 to 12 carbons may also be independently substituted by a halogen; or, one -CH2- or at least two non-adjacent -CH2- in the alkyl group having 1 to 12 carbons or the alkoxy group having 1 to 12 carbons may also be independently substituted by -O-, -CH=CH-, -C≡C-, -CO-O- or -O-CO- in a non-directly connected manner; The rings E1, E2, and E3 each independently represent Z 51 represents -CH2CH2-, -CF2O-, -OCF2-, -CH2O-, -OCH2-, -CO-O-, -C2F4-, or -CF=CF-; q represents 0 or 1.

8. The negative liquid crystal composition according to any one of claims 1-7, characterized in that: In the liquid crystal mixture described above, it further comprises one or more stabilizers, and the content of the stabilizer is 0-5%.

9. The negative liquid crystal composition according to any one of claims 1-7, characterized in that: In the liquid crystal composition described above, it further comprises one or more chiral dopants, and the content of the chiral dopant accounts for 0-5% of the total mass of the liquid crystal composition.

10. A liquid crystal display device, characterized in that: Comprising the negative liquid crystal composition according to any one of claims 1-9, and the liquid crystal display device includes VA, MVA, PVA, PSVA, IPS and FFS mode liquid crystal display devices.

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