A negative liquid crystal composition and use thereof

Abstract

The application provides a negative liquid crystal composition and application thereof, and belongs to the technical field of liquid crystal materials. The negative liquid crystal composition comprises at least one compound represented by general formula I, at least one compound represented by general formula II and at least one compound represented by general formula III. The negative liquid crystal composition provided by the application has low rotational viscosity, large elastic constant, large optical anisotropy, good low-temperature mutual solubility and fast response speed, can effectively improve the contrast ratio of a liquid crystal display, simultaneously takes into account the response speed of the liquid crystal display, and can obviously improve the display effect of the liquid crystal display in a VA, IPS or FFS mode display.

Description

Technical Field

[0001] This invention belongs to the field of liquid crystal material technology, specifically relating to a negative liquid crystal composition and its application. Background Technology

[0002] With the advancement of the information age, liquid crystal display technology is also constantly developing. People have increasingly higher requirements for the performance of liquid crystal displays, which has also stimulated people's research interest in liquid crystal materials, making liquid crystal technology a hot topic and continuing to develop.

[0003] Currently, LCD monitors are developing towards larger sizes, wider viewing angles, higher contrast ratios, and faster response times, with the performance of negative liquid crystals playing a crucial role. Among them, IPS (In-Plane Switching) and FFS (Fringe Field Switching) monitors are widely used in mobile phones, laptops, tablets, computer monitors, and televisions due to their unique hard screen characteristics and very wide viewing angles. However, the unique planar alignment of IPS and FFS displays also makes them prone to light leakage in dark conditions, resulting in significantly inferior contrast performance compared to VA (Vertical Alignment) type (MVA, PVA, UV2A, PSVA) monitors. Research has found that during the initial alignment of liquid crystal molecules, alignment defects on the surface of the alignment layer material can cause disordered liquid crystal molecule alignment, leading to light leakage in dark conditions. Therefore, improving the disordered liquid crystal alignment has become an important issue in improving IPS and FFS monitors.

[0004] Research has shown that increasing the elastic constant of liquid crystals helps to make the liquid crystal molecules more orderly arranged, effectively improving the light leakage problem of liquid crystal displays (LCDs) and thus improving contrast. However, as the elastic constant increases, the rotational viscosity of the liquid crystal composition also increases, resulting in a slower response speed for the LCD. Therefore, how to increase the elastic constant of liquid crystals without significantly sacrificing the response speed of LCDs has become one of the research directions in the field of liquid crystal displays. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a negative liquid crystal composition and its applications. This liquid crystal composition possesses low rotational viscosity, high elastic constant, high optical anisotropy, good low-temperature miscibility, and fast response speed, effectively improving the contrast of liquid crystal displays while maintaining their response speed.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a negative liquid crystal composition comprising at least one compound represented by general formula I, at least one compound represented by general formula II, and at least one compound represented by general formula III.

[0008]

[0009] In the general formula I, R1 and R2 each independently represent an alkyl group with 1-7 carbon atoms (e.g., 1, 2, 3, 4, 5, 6, or 7) or an alkenyl group with 2-7 carbon atoms (e.g., 2, 3, 4, 5, 6, or 7). represent

[0010] In the general formula II, R3 and R4 each independently represent an alkyl group with 1 to 7 carbon atoms (e.g., 1, 2, 3, 4, 5, 6 or 7), an alkoxy group with 1 to 7 carbon atoms (e.g., 1, 2, 3, 4, 5, 6 or 7), or an alkenyl group with 2 to 7 carbon atoms (e.g., 2, 3, 4, 5, 6 or 7).

[0011] In general formula III, R5 and R6 each independently represent an alkyl group with 1-7 carbon atoms (e.g., 1, 2, 3, 4, 5, 6, or 7), an alkoxy group with 1-7 carbon atoms (e.g., 1, 2, 3, 4, 5, 6, or 7), or an alkenyl group with 2-7 carbon atoms (e.g., 2, 3, 4, 5, 6, or 7), and n represents 1 or 2. represent And the n terms in general formula III They are independent of each other;

[0012] Where -* represents the linking bond of a group.

[0013] In the liquid crystal composition provided by this invention, the compound represented by general formula I is a compound containing dibenzothiophene, which has a large dielectric constant and a large elastic constant; the compound represented by general formula II is a compound containing dicyclohexane, which has good low-temperature solubility; and the compound represented by general formula III has negative dielectric anisotropy, which, when added to the liquid crystal composition, can further improve the dielectric anisotropy of the liquid crystal composition. Through the synergistic effect of the above components, this invention results in a negative liquid crystal composition with low rotational viscosity, a large elastic constant, large optical anisotropy, good low-temperature miscibility, and a fast response speed.

[0014] In some embodiments of the present invention, in general formula I, R1 and R2 each independently represent an alkyl group with 1-5 carbon atoms or a monoalkenyl group with 2-5 carbon atoms.

[0015] In some embodiments of the present invention, the compound represented by general formula I includes one or more of the compounds represented by formulas IA1-IA10, IB1-IB10 and IC1-IC10.

[0016]

[0017]

[0018] In some embodiments of the present invention, in general formula II, R3 and R4 each independently represent an alkyl group with 1-5 carbon atoms or a monoalkenyl group with 2-5 carbon atoms.

[0019] In some embodiments of the present invention, the compound represented by general formula II includes one or more of the compounds represented by formulas IIA1-IIA12, IIB1-IIB14 and IIC1-IIC4;

[0020]

[0021]

[0022] In some embodiments of the present invention, in general formula III, R5 represents an alkyl group with 1-5 carbon atoms or an alkoxy group with 1-5 carbon atoms, and R6 represents an alkyl group with 1-5 carbon atoms or a monoalkenyl group with 2-5 carbon atoms.

[0023] In some embodiments of the present invention, the compounds represented by general formula III include one or more of the compounds represented by formulas IIIA1-IIIA48, IIIB1-IIIB48, IIIC1-IIIC48, IIID1-IIID48, IIIE1-IIIE48 and IIIF1-IIIF48.

[0024]

[0025]

[0026]

[0027]

[0028]

[0029]

[0030]

[0031]

[0032]

[0033] In some embodiments of the present invention, the negative liquid crystal composition further includes one or more of the compounds represented by general formula IV, general formula V, and general formula VI.

[0034]

[0035] In the general formula IV, R7 and R8 each independently represent an alkyl group with 1-7 carbon atoms (e.g., 1, 2, 3, 4, 5, 6 or 7), an alkoxy group with 1-7 carbon atoms (e.g., 1, 2, 3, 4, 5, 6 or 7), or an alkenyl group with 2-7 carbon atoms (e.g., 2, 3, 4, 5, 6 or 7), and m represents 1 or 2;

[0036] In the general formula V, R9, R 10 Each of the following groups independently represents an alkyl group with 1-7 carbon atoms (e.g., 1, 2, 3, 4, 5, 6, or 7), an alkoxy group with 1-7 carbon atoms (e.g., 1, 2, 3, 4, 5, 6, or 7), or an alkenyl group with 2-7 carbon atoms (e.g., 2, 3, 4, 5, 6, or 7), where p represents 1 or 2. represent And the p items in the general formula V They are independent of each other;

[0037] In the general formula VI, R 11 R 12 Alkyl groups, alkoxy groups, or alkenyl groups, each independently representing 1 to 7 carbon atoms (e.g., 1, 2, 3, 4, 5, 6, or 7), respectively;

[0038] Where -* represents the linking bond of a group.

[0039] Among them, the compound represented by general formula IV is a compound containing methoxy bridges. When added to the liquid crystal composition, in combination with the compounds represented by general formulas I to III, it can further improve the negative dielectric anisotropy of the liquid crystal composition. The compound represented by general formula V is a tricyclic neutral compound. This compound has a high clearing point and good low-temperature solubility. In combination with the compounds represented by general formulas I to III, it helps to further improve the clearing point of the liquid crystal composition. The compound represented by general formula VI has a large elastic constant and low rotational viscosity. In combination with the compounds represented by general formulas I to III, it helps to further improve the contrast of the liquid crystal display.

[0040] In some embodiments of the present invention, in general formula IV, R7 represents an alkyl group of 1-5 carbon atoms or an alkoxy group of 1-5 carbon atoms, and R8 represents an alkyl group of 1-5 carbon atoms.

[0041] In some embodiments of the present invention, the compound represented by general formula IV includes one or more of the compounds represented by formulas IVA1-IVA12, IVB1-IVB12, IVC1-IVC12 and IVD1-IVD12.

[0042]

[0043]

[0044]

[0045] In some embodiments of the present invention, in general formula V, R9 represents an alkyl group with 1-5 carbon atoms or an alkoxy group with 1-5 carbon atoms, R 10 Represents an alkyl group with 1-5 carbon atoms or a monoalkenyl group with 2-5 carbon atoms, where p is 1.

[0046] In some embodiments of the present invention, the compound represented by general formula V includes one or more of the compounds represented by formulas VA1-VA48, VB1-VB48 and VC1-VC48.

[0047]

[0048]

[0049]

[0050]

[0051]

[0052] In some embodiments of the present invention, in general formula VI, R11 R represents an alkyl group or an alkoxy group with 1-5 carbon atoms. 12 Alkyl groups representing 1-5 carbon atoms or monoalkenyl groups representing 2-5 carbon atoms.

[0053] In some embodiments of the present invention, the compound represented by general formula VI includes one or more of the compounds represented by formulas ⅥA1-ⅥA20, ⅥB1-ⅥB18 and ⅥC1-ⅥC14;

[0054]

[0055]

[0056] In this invention, unless otherwise specified, "-C" refers to... n H 2n+1 " indicates an alkyl group (e.g., -C3H7, -C4H9, -C5H) 11 、) both refer to straight-chain alkyl groups.

[0057] In some embodiments of the present invention, the negative liquid crystal composition comprises the following components by mass percentage:

[0058] The compound represented by general formula I is 1% to 30%, for example, it can be 1%, 2%, 3%, 5%, 6%, 8%, 10%, 12%, 13%, 15%, 16%, 18%, 20%, 22%, 23%, 25%, 26%, 28%, or 30%, etc.;

[0059] The compounds represented by general formula II range from 1% to 60%, for example, they can be 1%, 2%, 3%, 5%, 6%, 8%, 10%, 12%, 13%, 15%, 16%, 18%, 20%, 22%, 23%, 25%, 26%, 28%, 30%, 32%, 33%, 35%, 36%, 38%, 40%, 42%, 43%, 45%, 46%, 48%, 50%, 52%, 53%, 55%, 56%, 58%, or 60%, etc.

[0060] The compounds represented by general formula III range from 1% to 60%, for example, they can be 1%, 2%, 3%, 5%, 6%, 8%, 10%, 12%, 13%, 15%, 16%, 18%, 20%, 22%, 23%, 25%, 26%, 28%, 30%, 32%, 33%, 35%, 36%, 38%, 40%, 42%, 43%, 45%, 46%, 48%, 50%, 52%, 53%, 55%, 56%, 58%, or 60%, etc.

[0061] The compound represented by general formula IV is 0% to 30%, for example, it can be 0%, 1%, 2%, 3%, 5%, 6%, 8%, 10%, 12%, 13%, 15%, 16%, 18%, 20%, 22%, 23%, 25%, 26%, 28%, or 30%, etc.;

[0062] The compound represented by general formula V is 0% to 30%, for example, it can be 0%, 1%, 2%, 3%, 5%, 6%, 8%, 10%, 12%, 13%, 15%, 16%, 18%, 20%, 22%, 23%, 25%, 26%, 28%, or 30%, etc.;

[0063] The compound represented by general formula VI is 0% to 30%, for example, it can be 0%, 1%, 2%, 3%, 5%, 6%, 8%, 10%, 12%, 13%, 15%, 16%, 18%, 20%, 22%, 23%, 25%, 26%, 28%, or 30%, etc.

[0064] In some preferred embodiments of the present invention, the negative liquid crystal composition comprises the following components by mass percentage:

[0065] Compounds represented by general formula I account for 5-25%;

[0066] Compounds represented by general formula II account for 10-60%;

[0067] Compounds represented by general formula III account for 20-60%;

[0068] Compounds represented by general formula IV account for 0–25%;

[0069] Compounds represented by general formula V account for 0–25%;

[0070] Compounds represented by general formula VI account for 0–25%.

[0071] In some preferred embodiments of the present invention, the negative liquid crystal composition comprises the following components by mass percentage:

[0072] Compounds represented by general formula I account for 5-15%;

[0073] Compounds represented by general formula II account for 25-60%;

[0074] Compounds represented by general formula III account for 25-60%;

[0075] Compounds represented by general formula IV account for 0–15%;

[0076] Compounds represented by general formula V account for 0–15%;

[0077] Compounds represented by general formula VI account for 0–15%.

[0078] In some preferred embodiments of the present invention, the total mass percentage of the compound represented by formula IV, the compound represented by formula V, and the compound represented by formula VI in the negative liquid crystal composition is 5% or more.

[0079] In a second aspect, the present invention provides an application of the negative liquid crystal composition as described in the first aspect, wherein the negative liquid crystal composition is used in a liquid crystal display, preferably in a VA, IPS or FFS mode display, and more preferably in an IPS or FFS mode liquid crystal display.

[0080] The present invention does not impose any particular limitation on the preparation method of the negative liquid crystal composition, and conventional methods can be used to prepare it by mixing two or more compounds. For example, it can be prepared by mixing different components at high temperature and dissolving them in each other; or, the component with a smaller content can be dissolved in the main component with a larger content at a higher temperature; or, the components can be dissolved in an organic solvent (such as acetone, chloroform, or methanol), and then the solutions are mixed and the solvent is removed.

[0081] Compared with the prior art, the present invention has the following beneficial effects:

[0082] The negative liquid crystal composition provided by this invention has low rotational viscosity, large elastic constant, large optical anisotropy, good low-temperature miscibility and fast response speed. It can be used for fast-response liquid crystal displays in various display modes. It can significantly improve the display effect of liquid crystal displays in VA, IPS or FFS mode displays, while improving contrast and response speed. It is especially suitable for IPS and FFS mode liquid crystal displays. Detailed Implementation

[0083] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention are described clearly and completely below. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0084] In this embodiment of the invention, the performance of the liquid crystal compound was tested using the following method:

[0085] △n: Represents optical anisotropy (25℃, wavelength: 589nm), measured using an Abbe refractometer;

[0086] △ε: Represents dielectric anisotropy (25℃, 1000Hz), measured using an INSTEC liquid crystal testing instrument;

[0087] γ1: Represents rotational viscosity (mPa·s, 25℃), measured using a viscometer;

[0088] Cp: ​​Represents the clearing point (°C) of the liquid crystal composition, measured using a polarizing microscope;

[0089] K 11 K 22 K 33 The values ​​represent the elastic constants (pN, 25℃) for development, torsion, and bending, respectively, and were measured using an Instec property measuring instrument.

[0090] In this embodiment of the invention, the liquid crystal composition is prepared by a thermal dissolution method, which includes the following steps: weighing the liquid crystal compound by weight percentage using a balance, wherein there is no specific requirement for the order of weighing and adding, usually weighing and mixing in order of the melting point of the liquid crystal compound from high to low, heating and stirring at 60 to 100°C to make the components evenly mixed, then filtering, and finally encapsulating to obtain the target sample.

[0091] Example 1

[0092] This embodiment provides a negative liquid crystal composition, the composition and properties of which are as follows:

[0093]

[0094] Example 2

[0095] This embodiment provides a negative liquid crystal composition, the composition and properties of which are as follows:

[0096]

[0097] Example 3

[0098] This embodiment provides a negative liquid crystal composition, the composition and properties of which are as follows:

[0099]

[0100] Example 4

[0101] This embodiment provides a negative liquid crystal composition, the composition and properties of which are as follows:

[0102]

[0103] Example 5

[0104] This embodiment provides a negative liquid crystal composition, the composition and properties of which are as follows:

[0105]

[0106]

[0107] Example 6

[0108] This embodiment provides a negative liquid crystal composition, the composition and properties of which are as follows:

[0109]

[0110] Example 7

[0111] This embodiment provides a negative liquid crystal composition, the composition and properties of which are as follows:

[0112]

[0113]

[0114] Example 8

[0115] This embodiment provides a negative liquid crystal composition, the composition and properties of which are as follows:

[0116]

[0117] Example 9

[0118] This embodiment provides a negative liquid crystal composition, the composition and properties of which are as follows:

[0119]

[0120]

[0121] Example 10

[0122] This embodiment provides a negative liquid crystal composition, the composition and properties of which are as follows:

[0123]

[0124] Example 11

[0125] This embodiment provides a negative liquid crystal composition, the composition and properties of which are as follows:

[0126]

[0127] Example 12

[0128] This embodiment provides a negative liquid crystal composition, the composition and properties of which are as follows:

[0129]

[0130] Example 13

[0131] This embodiment provides a negative liquid crystal composition, the composition and properties of which are as follows:

[0132]

[0133] Example 14

[0134] This embodiment provides a negative liquid crystal composition, the composition and properties of which are as follows:

[0135]

[0136] Example 15

[0137] This embodiment provides a negative liquid crystal composition, the composition and properties of which are as follows:

[0138]

[0139]

[0140] Comparative Example 1

[0141] This comparative example provides a liquid crystal composition with the following composition and properties:

[0142]

[0143] The structural formula of compound I'-1 is as follows: Comparative Example 2

[0144] This comparative example provides a liquid crystal composition with the following composition and properties:

[0145]

[0146] The structural formula of compound I'-2 is as follows: Comparative Example 3

[0147] This comparative example provides a liquid crystal composition with the following composition and properties:

[0148]

[0149] Comparative Example 4

[0150] This comparative example provides a liquid crystal composition with the following composition and properties:

[0151]

[0152] Comparative Example 5

[0153] This comparative example provides a liquid crystal composition that differs from Example 1 only in that it does not contain the compound represented by general formula I (the mass ratio between other components remains unchanged).

[0154] Comparative Example 6

[0155] This comparative example provides a liquid crystal composition that differs from Example 1 only in that it does not contain the compound represented by general formula II (the mass ratio between other components remains unchanged).

[0156] Comparative Example 7

[0157] This comparative example provides a liquid crystal composition that differs from Example 1 only in that it does not contain the compound represented by general formula III (the mass ratio between other components remains unchanged).

[0158] The performance parameters of the liquid crystal compositions provided in the examples and comparative examples were statistically compared, as shown in Table 1.

[0159] Table 1

[0160] Group Cp Δε △n K11 γ1 γ1 / K11 Example 1 112.0 -3.52 0.103 25.12 138.1 5.50 Example 2 112.1 -3.58 0.103 24.86 136.7 5.50 Example 3 111.6 -3.41 0.103 24.20 133.0 5.50 Example 4 114.2 -3.51 0.103 25.32 142.9 5.64 Example 5 111.6 -3.55 0.103 24.22 131.8 5.44 Example 6 114.0 -3.50 0.103 25.86 138.9 5.37 Example 7 109.5 -3.43 0.103 24.76 135.7 5.48 Example 8 109.7 -3.39 0.103 24.68 137.9 5.59 Example 9 109.6 -3.40 0.103 24.42 136.4 5.59 Example 10 110.4 -3.41 0.103 25.22 140.1 5.56 Example 11 113.2 -5.54 0.108 24.68 138.6 5.62 Example 12 109.8 -2.68 0.103 24.22 134.6 5.56 Example 13 115.3 -4.32 0.103 25.24 140.2 5.55 Example 14 113.9 -4.62 0.103 24.84 141.3 5.69 Example 15 110.2 -3.36 0.104 25.42 141.6 5.57 Comparative Example 1 109.2 -3.54 0.102 22.32 134.1 6.01 Comparative Example 2 114.2 -3.51 0.104 26.22 162.1 6.18 Comparative Example 3 124.3 -3.42 0.103 22.82 174.4 7.64 Comparative Example 4 124.1 -3.36 0.103 23.48 180.4 7.68 Comparative Example 5 108.6 -2.98 0.098 20.32 114.8 5.65 Comparative Example 6 / / / / / / Comparative Example 7 96.8 -1.68 0.076 18.65 98.6 5.29

[0161] As shown in Table 1, compared with Example 1, in Comparative Example 1, compound I'-1 was used instead of the compound represented by general formula I, and in Comparative Example 2, compound I'-2 was used instead of the compound represented by general formula I. While the dielectric anisotropy (Δε), optical anisotropy (Δn), and rotational viscosity (γ1) of the liquid crystal composition provided in Comparative Example 1 were essentially the same as those in Example 1, its elastic constant (K11) decreased by 11%, and its response time (γ1 / K11) increased by 9.3%, which resulted in a slower response speed and decreased contrast of the liquid crystal display. While the dielectric anisotropy (Δε), optical anisotropy (Δn), and elastic constant (K11) of the liquid crystal composition provided in Comparative Example 2 were essentially the same as those in Example 1, its rotational viscosity (γ1) increased by 17.4%, and its response time (γ1 / K11) increased by 12.4%, which also resulted in a slower response speed of the liquid crystal display. Compared to compound IB3 used in Example 1, the structural differences between compound I'-1 used in Comparative Example 1 and compound I'-2 used in Comparative Example 2 lie in the different intermediate bridging bonds. This indicates that the compound represented by general formula I represents the optimal structure for this type of compound.

[0162] Compared to the examples, Comparative Examples 3 and 4 lacked the compound represented by General Formula I. The resulting liquid crystal compositions, while maintaining essentially the same dielectric anisotropy (Δε) and optical anisotropy (Δn), exhibited a decreased stretch elastic constant (K11), a significantly increased rotational viscosity (γ1), and a significantly increased response time (γ1 / K11). This resulted in a slower response speed and decreased contrast in the liquid crystal display. This indicates that the compound represented by General Formula I is an essential component of the liquid crystal composition provided by this invention.

[0163] Compared to Example 1, Comparative Examples 5-7 lack compounds represented by General Formula I, General Formula II, and General Formula III, respectively. The liquid crystal composition obtained in Comparative Example 6 is solid at room temperature, making it impossible to test relevant parameters and thus lacking practical application value. The liquid crystal compositions obtained in Comparative Examples 5 and 7 have significantly higher dielectric constants, significantly lower refractive indices, and significantly lower elastic constants than those in Example 1. This results in higher driving voltages, lower transmittance, lower contrast, and a significant decrease in display performance in liquid crystal displays using these compositions. This indicates that the three components in the liquid crystal composition of this invention have a synergistic relationship; the absence of any one component will lead to a significant decrease in the display performance and characteristics of the liquid crystal composition.

[0164] As can be seen from the above embodiments, the liquid crystal composition provided by the present invention has low rotational viscosity, high elastic constant, high optical anisotropy, and good low-temperature miscibility, which can significantly improve the contrast of liquid crystal displays while maintaining the response speed of the liquid crystal displays. Therefore, the liquid crystal composition provided by the present invention is suitable for high-contrast VA, IPS, and FFS type liquid crystal displays, and is especially suitable for IPS and FFS liquid crystal displays.

[0165] The above description is merely a specific embodiment of this disclosure, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A negative liquid crystal composition, characterized in that, It comprises the following components in mass percentage: 5-25% of at least one compound represented by general formula I, 10-60% of at least one compound represented by general formula II, and 20-60% of at least one compound represented by general formula III; I； II; III; In the general formula I, R1 and R2 each independently represent an alkyl group with 1-7 carbon atoms or an alkenyl group with 2-7 carbon atoms. represent , or ; In the general formula II, R3 and R4 each independently represent an alkyl group with 1-7 carbon atoms, an alkoxy group with 1-7 carbon atoms, or an alkenyl group with 2-7 carbon atoms; In general formula III, R5 and R6 each independently represent an alkyl group with 1-7 carbon atoms, an alkoxy group with 1-7 carbon atoms, or an alkenyl group with 2-7 carbon atoms, and n represents 1 or 2. represent , or And the n terms in general formula III They are independent of each other; in Represents the connecting bond of a group.

2. The negative liquid crystal composition according to claim 1, characterized in that, In the general formula I, R1 and R2 each independently represent an alkyl group with 1-5 carbon atoms or a monoalkenyl group with 2-5 carbon atoms.

3. The negative liquid crystal composition according to claim 2, characterized in that, The compounds represented by general formula I include one or more of the compounds represented by formulas IA1-IA10, IB1-IB10 and IC1-IC10; 4. The negative liquid crystal composition according to claim 1, characterized in that, In the general formula II, R3 and R4 each independently represent an alkyl group with 1-5 carbon atoms or a monoalkenyl group with 2-5 carbon atoms.

5. The negative liquid crystal composition according to claim 4, characterized in that, The compounds represented by general formula II include one or more of the compounds represented by formulas IIA1-IIA12, IIB1-IIB14 and IIC1-IIC4; 6. The negative liquid crystal composition according to claim 1, characterized in that, In the general formula III, R5 represents an alkyl group with 1-5 carbon atoms or an alkoxy group with 1-5 carbon atoms, and R6 represents an alkyl group with 1-5 carbon atoms or a monoalkenyl group with 2-5 carbon atoms.

7. The negative liquid crystal composition according to claim 6, characterized in that, The compounds represented by general formula III include one or more of the compounds represented by formulas IIIA1-IIIA48, IIIB1-IIIB48, IIIC1-IIIC48, IIID1-IIID48, IIIE1-IIIE48 and IIIF1-IIIF48.

8. The negative liquid crystal composition according to any one of claims 1-7, characterized in that, The negative liquid crystal composition further includes one or more of the compounds represented by general formula IV, general formula V, and general formula VI. IV; V； WE; In the general formula IV, R7 and R8 each independently represent an alkyl group with 1-7 carbon atoms, an alkoxy group with 1-7 carbon atoms, or an alkenyl group with 2-7 carbon atoms, and m represents 1 or 2. In the general formula V, R9, R 10 Each can independently represent an alkyl group with 1-7 carbon atoms, an alkoxy group with 1-7 carbon atoms, or an alkenyl group with 2-7 carbon atoms, where p represents 1 or 2. represent , or And the p elements in the general formula V They are independent of each other; In the general formula VI, R 11 R 12 Each can independently represent an alkyl group with 1-7 carbon atoms, an alkoxy group with 1-7 carbon atoms, or an alkenyl group with 2-7 carbon atoms; in Represents the connecting bond of a group.

9. The negative liquid crystal composition according to claim 8, characterized in that, In the general formula IV, R7 represents an alkyl group with 1-5 carbon atoms or an alkoxy group with 1-5 carbon atoms, and R8 represents an alkyl group with 1-5 carbon atoms.

10. The negative liquid crystal composition according to claim 9, characterized in that, The compounds represented by general formula IV include one or more of the compounds represented by formulas IVA1-IVA12, IVB1-IVB12, IVC1-IVC12 and IVD1-IVD12; 11. The negative liquid crystal composition according to claim 8, characterized in that, In the general formula V, R9 represents an alkyl group with 1-5 carbon atoms or an alkoxy group with 1-5 carbon atoms, R 10 Represents an alkyl group with 1-5 carbon atoms or a monoalkenyl group with 2-5 carbon atoms, where p is 1.

12. The negative liquid crystal composition according to claim 11, characterized in that, The compounds represented by the general formula V include one or more of the compounds represented by formulas VA1-VA48, VB1-VB48, and VC1-VC48.

13. The negative liquid crystal composition according to claim 8, characterized in that, In the general formula VI, R 11 R represents an alkyl group or an alkoxy group with 1-5 carbon atoms. 12 Alkyl groups representing 1-5 carbon atoms or monoalkenyl groups representing 2-5 carbon atoms.

14. The negative liquid crystal composition according to claim 13, characterized in that, The compounds represented by general formula VI include one or more of the compounds represented by formulas ⅥA1-ⅥA20, ⅥB1-ⅥB18 and ⅥC1-ⅥC14; 15. The negative liquid crystal composition according to claim 8, characterized in that, The negative liquid crystal composition comprises the following components by mass percentage: Compounds represented by general formula I account for 5-25%; Compounds represented by general formula II account for 10-60%; Compounds represented by general formula III account for 20-60%; Compounds represented by formula IV account for 0-25%; Compounds represented by general formula V account for 0-25%; Compounds represented by general formula VI account for 0-25%.

16. The negative liquid crystal composition according to claim 15, characterized in that, The negative liquid crystal composition comprises the following components by mass percentage: Compounds represented by general formula I account for 5-15%; Compounds represented by general formula II account for 25-60%; Compounds represented by general formula III account for 25-60%; Compounds represented by formula IV account for 0-15%; Compounds represented by general formula V account for 0-15%; Compounds represented by general formula VI account for 0-15%.

17. The negative liquid crystal composition according to claim 15 or 16, characterized in that, In the negative liquid crystal composition, the total mass percentage of the compound represented by formula IV, the compound represented by formula V, and the compound represented by formula VI is more than 5%.

18. An application of the negative liquid crystal composition according to any one of claims 1-17, characterized in that, The negative liquid crystal composition is used in liquid crystal displays.

19. The application according to claim 18, characterized in that, The negative liquid crystal composition is used in VA, IPS or FFS mode displays.

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