Liquid crystal composition and liquid crystal display device thereof

Abstract

The invention provides a liquid crystal composition and a liquid crystal display device thereof. The liquid crystal composition comprises at least one compound as shown in a general formula I and at least one compound as shown in a general formula N, wherein the compound as shown in the general formula I accounts for 0.1-50% of the liquid crystal composition in percentage by weight. The invention also provides a liquid crystal display device containing the liquid crystal composition. The liquid crystal composition provided by the invention has relatively high optical anisotropy, relatively high clearing point, relatively high transmittance, relatively high epsilon perpendicular to / delta epsilon, relatively large Kave and good low-temperature stability, so that a liquid crystal display device comprising the liquid crystal composition provided by the invention has relatively high transmittance and relatively low light scattering; according to the liquid crystal composition disclosed by the invention, a liquid crystal display device containing the liquid crystal composition can obtain a good display effect. # imgabs0 #

Description

[0001] This application is a divisional application of the invention patent application with application number 201811272265.1 filed on October 30, 2018 and invention name “Liquid crystal composition and liquid crystal display device thereof”. Technical Field

[0002] The present invention relates to the field of liquid crystal materials, and in particular to a liquid crystal composition and a liquid crystal display device thereof. Background Art

[0003] Liquid crystal materials are mixtures of organic rod-shaped small molecular compounds that have both the fluidity of liquid and the anisotropy of crystal at a certain temperature. Liquid crystal display devices work by utilizing the optical anisotropy and dielectric anisotropy of liquid crystal materials themselves, and have been widely used. Liquid crystal display elements are classified based on the operation mode of liquid crystal molecules as follows: phase change (PC), twisted nematic (TN), super twisted nematic (STN), dynamic scattering (DS), ferroelectric liquid crystal (FLC), guest-host (GH), electrically controlled birefringence (ECB), optically compensated bend (OCB), in-plane switching (IPS), vertical alignment (VA), fringe fields switching (FFS), field-induced photo-reactive alignment (FPA) and other modes.

[0004] These liquid crystal display elements include a liquid crystal composition having appropriate physical properties. The general physical properties required of the liquid crystal compound as a component of the liquid crystal composition are as follows:

[0005] (1) Stable chemical and physical properties;

[0006] (2) It has a high clearing point (nematic-isotropic phase transition temperature);

[0007] (3) The lower limit temperature of the liquid crystal phase (such as the nematic phase, cholesteric phase, lamellar phase, blue phase and other optically isotropic liquid crystal phases) is low;

[0008] (4) Excellent compatibility with other liquid crystal compounds;

[0009] (5) having a dielectric anisotropy of appropriate magnitude; and

[0010] (6) Having an appropriate optical anisotropy.

[0011] In modern technology, liquid crystal displays (LCD) have developed rapidly due to their small size, light weight, low power consumption and excellent display quality, and have been widely used in portable electronic information products. With the increase in the size of LCD screens used in portable computers, office applications, and video applications, there are still some problems to be solved in order to enable LCDs to be used for large-screen displays and eventually replace cathode ray tubes (CRTs), such as improving viewing angle characteristics, increasing response speed, increasing contrast, increasing transmittance, and improving low-temperature stability. The narrow viewing angle of LCD means that when observing away from the direction perpendicular to the normal of the liquid crystal box, the contrast is significantly reduced, and grayscale and color inversion will occur when the viewing angle is large, which seriously affects the display quality of LCD.

[0012] In the early 1970s, experimental research on the basic electro-optical properties of uniformly arranged and twistedly arranged nematic liquid crystal IPS mode has been carried out. Its characteristics are that a pair of electrodes are made on the same substrate, while there is no electrode on the other substrate. The arrangement of liquid crystal molecules is controlled by applying a lateral electric field between the pair of electrodes. Therefore, this mode can also be called a lateral field mode. In the IPS mode, the nematic phase liquid crystal molecules are arranged uniformly and parallel between the two substrates, and the two polarizers are placed orthogonally. When the IPS mode is not applied with an electric field, the incident light is blocked by the two orthogonal polarizers and is in a dark state. When the electric field is applied, the liquid crystal molecules rotate and cause a delay, so light leaks from the two orthogonal polarizers. The advantages of the panel using the IPS mode are a large viewing angle and accurate color reproduction, but the disadvantages are serious light leakage, slow response speed, and high energy consumption.

[0013] With the widespread application of TFT LCD, the requirements for its performance are also constantly increasing. High display image quality requires faster response speed, lower energy consumption, and higher low-temperature reliability. In addition, higher contrast and transmittance are required, especially for IPS liquid crystal display mode. This means that liquid crystal materials need to have higher contrast and transmittance, higher elastic constant, faster response speed, higher dielectric constant and low-temperature reliability, and the improvement of these performances requires the improvement of liquid crystal materials.

[0014] According to the transmittance formula of IPS mode, Transmittance (transmittance, T) ∝ |Δε| / ε ⊥(“∝” indicates an “inversely proportional” relationship). To increase the transmittance of liquid crystal materials, one can try to reduce the Δε of the liquid crystal materials, but generally the adjustment range of the driving voltage of the same product is limited. In addition, the liquid crystal molecules will tilt toward the Z axis under the action of the vertical component of the fringe electric field, causing their optical anisotropy Δn to change. According to the formula (where χ is the angle between the optical axis of the liquid crystal layer and the optical axis of the polarizer, Δn is the optical anisotropy, d is the cell spacing, and λ is the wavelength) It can be seen that the effective Δn*d will affect T. If the transmittance of the positive liquid crystal material is to be improved, increasing Δn*d can also be considered, but the delay design of each product is fixed.

[0015] On the other hand, based on the traditional IPS-LCD light leakage test, technicians in this field found that the main factors causing the light leakage problem of liquid crystal display devices are: light scattering (LC scattering), rubbing uniformity, color filter film leakage (CF / TFT scattering) and polarization ability, among which light scattering accounts for 63% of the factors affecting light leakage.

[0016] According to the following relationship:

[0017]

[0018] To improve the light scattering of liquid crystal materials, it is necessary to increase the average elastic constant K ave (in, ) to improve light scattering; ave In this case, light leakage of the liquid crystal material can be reduced.

[0019] In addition, the relationship between contrast (CR) and brightness (L) is as follows:

[0020] CR=L 255 / L0×100%,

[0021] Among them, L 255 L0 is the brightness of the on state, and L0 is the brightness of the off state. It can be seen that the change of L0 significantly affects CR. In the off state, L0 has nothing to do with the dielectric of the liquid crystal molecules, but is related to the light scattering (LC scattering) of the liquid crystal material itself. The smaller the light scattering (LC scattering), the smaller L0 is, and the contrast ratio (CR) will be significantly improved.

[0022] In view of the above situation, the following two aspects can be considered to improve the transmittance of liquid crystal materials: (1) by increasing ε ⊥ / Δε to increase transmittance; (2) increase the average elastic constant K of the liquid crystal compositionave The value of makes the liquid crystal molecules more ordered and less light leaks, thereby improving the transmittance.

[0023] Therefore, there is a need for a liquid crystal composition that can ensure that the liquid crystal composition has a high transmittance while also having properties such as a suitably high clearing point, a high optical anisotropy, and a high dielectric anisotropy. Summary of the invention

[0024] Purpose of the invention: The purpose of the present invention is to provide a high optical anisotropy, high clearing point, high transmittance, high ε ⊥ / Δε, larger K ave The present invention also aims to provide a liquid crystal display device comprising the liquid crystal composition.

[0025] The technical solution of the present invention:

[0026] In order to achieve the above-mentioned object of the invention, the present invention provides a liquid crystal composition, characterized in that the liquid crystal composition comprises:

[0027] At least one compound of formula I

[0028] as well as

[0029] At least one compound of the general formula N

[0030]

[0031] in,

[0032] R1 represents a straight or branched alkyl group containing 1 to 12 carbon atoms, one or more non-adjacent -CH2- in the straight or branched alkyl group containing 1 to 12 carbon atoms can be independently replaced by -C=C-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-, and one or more -H in the straight or branched alkyl group containing 1 to 12 carbon atoms can be independently replaced by -F or -Cl;

[0033] R N1 and R N2 Each independently represents a straight-chain or branched alkyl group containing 1 to 12 carbon atoms, and one or more non-adjacent -CH2- in the straight-chain or branched alkyl group containing 1 to 12 carbon atoms can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-;

[0034] ring express One or more -H in the ring may be replaced by -CN, -F or -Cl, and one or more -CH= in the ring may be replaced by -N=;

[0035] ring and ring Each independently expresses in, One or more -CH2- in the ring may be replaced by -O-, and one or at most two single bonds in the ring may be replaced by double bonds, One or more -H in the ring may be replaced by -F or -Cl, and one or more -CH= in the ring may be replaced by -N=;

[0036] Z N1 and Z N2 Each independently represents a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, -(CH2)4-, -CF2O-, -OCF2- or -CF2CF2-; and

[0037] n N1 Represents 0, 1, 2, or 3, n N2 Represents 0 or 1, and 0≤n N1 +n N2 ≤3, when n N1 =2 or 3, the ring Can be the same or different, Z N1 Can be the same or different.

[0038] In some embodiments of the present invention, the liquid crystal composition of the present invention further comprises at least one compound of formula II

[0039]

[0040] in,

[0041] R A2 represents a straight or branched alkyl group containing 1 to 12 carbon atoms, One or more non-adjacent -CH2- in the straight or branched alkyl group containing 1 to 12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-, and one or more -H in these groups may be independently replaced by -F or -Cl;

[0042] ring and ring Each independently expresses in, and One or more -CH2- in the ring may be replaced by -O-, and one or more single bonds in the ring may be replaced by double bonds, One or more -H in the ring may be replaced by -CN, -F or -Cl, and one or more -CH= in the ring may be replaced by -N=;

[0043] Z A21 and Z A22 Each independently represents a single bond, -CH2CH2-, -CF2CF2-, -CO-O-, -O-CO-, -O-CO-O-, -CH=CH-, -C≡C-, -CF=CF-, -CH2O- or -OCH2-;

[0044] L A21 , L A22 , L A23 and L A24 Each independently represents -H, -F, -CH3 or -Cl;

[0045] X A2 represents halogen, a haloalkyl or haloalkoxy group having 1 to 5 carbon atoms, a haloalkenyl or haloalkenyloxy group having 2 to 5 carbon atoms;

[0046] n A2 Represents 0, 1, 2, or 3. When n A2 =2 or 3, the ring Can be the same or different, Z A21 may be the same or different; and

[0047] The compounds of general formula II do not include the compounds of general formula I.

[0048] In some embodiments of the present invention, in the compound of formula II, when Z A21 and Z A22 represents a single bond and n A2 When it indicates 1, the ring and ring Not at the same time

[0049] In some embodiments of the present invention, the liquid crystal composition of the present invention further comprises at least one compound of the general formula M

[0050]

[0051] in,

[0052] R M1 and R M2 Each independently represents -H, a straight chain or branched chain alkyl group containing 1 to 12 carbon atoms, a straight chain or branched chain alkenyl group containing 2 to 12 carbon atoms, One or more non-adjacent -CH2- in the straight or branched alkyl group containing 1 to 12 carbon atoms may be independently replaced by -C≡C-, -O-, -CO-, -CO-O- or -O-CO-;

[0053] ring ring and ring Each independently expresses in, One or more -CH2- in may be replaced by -O-, At most one -H in may be replaced by halogen;

[0054] Z M1 and Z M2 Each independently represents a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2- or -(CH2)4-; and

[0055] n M1 represents 0, 1, 2, or 3, and when n M1 =2 or 3, the ring Can be the same or different, Z M2 Can be the same or different.

[0056] In some embodiments of the present invention, the dielectric anisotropy of the compound of formula I and the compound of formula II are both positive.

[0057] In some embodiments of the present invention, the absolute value of the dielectric anisotropy of the compound of general formula M is no more than 3; preferably, the absolute value of the dielectric anisotropy of the compound of general formula M is no more than 2.

[0058] In some embodiments of the present invention, the dielectric anisotropy of the compound of Formula N is negative.

[0059] In some embodiments of the present invention, the compound of general formula I has a strong rigid biphenyl structure, which can effectively adjust the birefringence, elastic constant, contrast and other properties of the liquid crystal composition; the content of the compound of general formula I needs to be appropriately adjusted according to the required performance such as transmittance, contrast, birefringence, process adaptability, drip marks, screen burn-in, dielectric anisotropy, etc.

[0060] Regarding the weight percentage of the compound of general formula I in the liquid crystal composition of the present invention, it is preferred that: relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of general formula I in the liquid crystal composition of the present invention is 0.1%, 0.5%, 1%, 2%, 3%, 4%, 5%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 20% or 30%; relative to the total weight of the liquid crystal composition of the present invention, the preferred upper limit of the weight percentage of the compound of general formula I in the liquid crystal composition of the present invention is 50%, 45%, 40%, 35%, 30%, 28%, 27%, 26%, 25.5%, 25%, 24.5%, 24%, 22%, 20%, 18%, 16% or 15%.

[0061] In some embodiments of the present invention, the weight percentage of the compound of formula I in the liquid crystal composition is 0.1%-50%.

[0062] In some embodiments of the present invention, in the compounds of formula I, R1 is preferably an alkyl or alkoxy group containing 1 to 8 carbon atoms, an alkenyl or alkenyloxy group containing 2 to 8 carbon atoms.

[0063] In a preferred embodiment of the present invention, the ring It can be expressed as

[0064] Preferably More preferably Particularly preferred

[0065] In some embodiments of the present invention, the compound of formula I is selected from the group consisting of:

[0066]

[0067]

[0068] In some embodiments of the present invention, the liquid crystal composition of the present invention preferably contains at least one compound of the general formula I; more preferably contains at least one compound of the general formula I-1; and particularly preferably contains 2 to 10 compounds of the general formula I-1.

[0069] In some embodiments of the present invention, in the compounds of general formula I, R1 is preferably an alkyl or alkoxy group containing 2-8 carbon atoms, an alkenyl or alkenyloxy group containing 2-8 carbon atoms; in particular, the compounds of general formula I in which R1 is preferably an alkyl group containing 2-8 carbon atoms can make the liquid crystal composition containing the compounds of general formula I have higher optical anisotropy.

[0070] In some embodiments of the present invention, the and ring Each independently expresses

[0071]

[0072] In some embodiments of the present invention, the compound of formula II is selected from the group consisting of the following compounds:

[0073]

[0074]

[0075]

[0076]

[0077] as well as

[0078]

[0079] in,

[0080] R A2 It represents a straight-chain or branched alkyl group containing 1-8 carbon atoms, wherein one or more non-adjacent -CH2- groups in the straight-chain or branched alkyl group containing 1-8 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-, and one or more -H groups present in these groups may be independently replaced by -F or -Cl.

[0081] In some embodiments of the present invention, the compound of Formula II preferably has an absolute value of dielectric anisotropy greater than 4.

[0082] The liquid crystal composition of the present invention preferably contains at least one compound of general formula II; more preferably contains at least one compound of general formula II-1 to II-3, II-15 to II-20, II-24, II-26, II-28 to II-33; further preferably contains 2 to 12 compounds of general formula II-1 to II-3, II-15 to II-20, II-24, II-26, II-28 to II-33; further preferably contains 2 to 10 compounds of general formula II-1 to II-3, II-15 to II-20, II-24, II-26, II-28 to II-33; further preferably contains 2 to 8 compounds of general formula II-1 to II-3, II-15 to II-20, II-24, II-26, II-28 to II-33.

[0083] In some embodiments of the present invention, the compound of general formula II is preferably a group consisting of compounds of general formula II-1, general formula II-2, general formula II-3, general formula II-15, general formula II-16, general formula II-17, general formula II-24, general formula II-27, general formula II-28 and general formula II-29.

[0084] Regarding the weight percentage of the compound of general formula II in the liquid crystal composition of the present invention, it is preferred that: relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of general formula II in the liquid crystal composition of the present invention is 1%, 3%, 5%, 10%, 13%, 14%, 15%, 18%, 20%, 23%, 25%, 28%, 30%, 33%, 35% or 38%; relative to the total weight of the liquid crystal composition of the present invention, the preferred upper limit of the weight percentage of the compound of general formula II in the liquid crystal composition of the present invention is 85%, 80%, 75%, 70%, 65%, 60%, 55%, 50%, 40%, 38%, 35%, 33%, 30%, 28%, 25%, 23%, 20%, 18%, 15% or 10%.

[0085] In some embodiments of the present invention, the weight percentage of the compound of formula II in the liquid crystal composition is 1%-85%.

[0086] In some embodiments of the present invention, when it is necessary to keep the viscosity of the liquid crystal composition of the present invention low and the response time short, it is preferred that the lower limit of the weight percentage of the compound of formula II is slightly lower and the upper limit is slightly lower, wherein the lower limit is preferably: 3%, 5%, 10%, 13%, 14%, 15%, 18%, 20%, 23%, 25%, 28%, 30%, 33%, 35%, 38% or 40%, and the upper limit is preferably: 50%, 48%, 46%, 43%, 40%, 38%, 35%, 33% , 30%, 28%, 25%, 23% or 20%; further, when it is necessary to maintain a high clearing point and good temperature stability of the liquid crystal composition of the present invention, it is preferred that the lower limit of the weight percentage of the compound of general formula II is slightly lower and the upper limit is slightly lower, wherein the lower limit is preferably: 5%, 10%, 13%, 14%, 15%, 18%, 20%, 23%, 25%, 28% or 30%, and the upper limit is preferably: 50%, 45%, 40%, 38%, 35%, 33%, 30%, 28% or 25%. In addition, in order to keep the driving voltage low and increase the dielectric anisotropy, it is preferred to increase the lower limit of the weight percentage of the compound of general formula II and the upper limit, wherein the lower limit is preferably: 10%, 13%, 14%, 15%, 18%, 20%, 23%, 25%, 28% or 30%, and the upper limit is preferably: 85%, 80%, 75%, 70%, 68%, 65%, 63%, 60%, 55%, 50%, 40%, 38%, 35%, 33%, 30%, 28% or 25%.

[0087] In some embodiments of the present invention, the compound of formula M can effectively improve the clearing point, response time, contrast and low temperature stability of the liquid crystal composition.

[0088] In some embodiments of the present invention, in the compound of formula M, R M1 and R M2 Each is independently preferably a straight chain or branched chain alkyl group containing 1 to 10 carbon atoms, a straight chain or branched chain alkoxy group containing 1 to 9 carbon atoms, a straight chain or branched chain alkenyl group containing 2 to 10 carbon atoms, or a straight chain or branched chain alkenyloxy group containing 2 to 10 carbon atoms; further preferably a straight chain or branched chain alkyl group containing 1 to 8 carbon atoms, a straight chain or branched chain alkoxy group containing 1 to 7 carbon atoms, or a straight chain or branched chain alkenyl group containing 2 to 8 carbon atoms; further preferably a straight chain or branched chain alkyl group containing 1 to 5 carbon atoms, a straight chain or branched chain alkoxy group containing 1 to 5 carbon atoms, or a straight chain or branched chain alkenyl group containing 2 to 5 carbon atoms.

[0089] In some embodiments of the present invention, preferably, R M1 and R M2One or both of them are straight-chain or branched alkenyl groups containing 2 to 8 carbon atoms; further preferably, R M1 and R M2 One or both of them are straight-chain or branched alkenyl groups having 2 to 5 carbon atoms.

[0090] In some embodiments of the present invention, preferably, R M1 and R M2 One of them is a straight chain or branched alkenyl group having 2 to 5 carbon atoms, and the other is a straight chain or branched alkyl group having 1 to 5 carbon atoms.

[0091] In some embodiments of the present invention, preferably, R M1 and R M2 Both are straight-chain or branched alkyl groups containing 1 to 8 carbon atoms, or straight-chain or branched alkoxy groups containing 1 to 7 carbon atoms; more preferably, they are straight-chain or branched alkyl groups containing 1 to 5 carbon atoms, or straight-chain or branched alkoxy groups containing 1 to 4 carbon atoms.

[0092] In some embodiments of the present invention, preferably, R M1 and R M2 One of them is a straight-chain or branched alkyl group containing 1 to 5 carbon atoms, and the other is a straight-chain or branched alkyl group containing 1 to 5 carbon atoms, or a straight-chain or branched alkoxy group containing 1 to 4 carbon atoms; further preferably, R M1 and R M2 Both are straight-chain or branched-chain alkyl groups having 1 to 5 carbon atoms.

[0093] The alkenyl group in the present invention is preferably selected from the group represented by any one of formula (V1) to formula (V9), and is particularly preferably formula (V1), formula (V2), formula (V8) or (V9). The groups represented by formula (V1) to formula (V9) are as follows:

[0094]

[0095] Here, * represents the carbon atom in the ring structure to which it is bonded.

[0096] The alkenyloxy group in the present invention is preferably selected from the group represented by any one of formula (OV1) to formula (OV9), and is particularly preferably the group represented by formula (OV1), formula (OV2), formula (OV8) or (OV9). The groups represented by formula (OV1) to formula (OV9) are as follows:

[0097]

[0098] Here, * represents the carbon atom in the ring structure to which it is bonded.

[0099] In some embodiments of the present invention, the compound of formula M is selected from the group consisting of:

[0100]

[0101]

[0102] as well as

[0103]

[0104] In some embodiments of the present invention, the content of the compound of formula M must be appropriately adjusted depending on the required properties such as solubility at low temperature, transition temperature, electrical reliability, birefringence, process adaptability, drip marks, screen burn-in, dielectric anisotropy, etc.

[0105] Regarding the weight percentage of the compound of general formula M in the liquid crystal composition of the present invention, it is preferred that: relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of general formula M in the liquid crystal composition of the present invention is 0%, 0.1%, 0.5%, 1%, 2%, 3%, 5%, 7%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, 42%, 45%, 48% or 50%; relative to the total weight of the liquid crystal composition of the present invention, the preferred upper limit of the weight percentage of the compound of general formula M in the liquid crystal composition of the present invention is 80%, 75%, 70%, 65%, 60%, 55%, 50%, 45%, 40%, 38%, 35%, 33%, 30%, 28%, 25%, 22% or 20%.

[0106] In some embodiments of the present invention, the compound of formula M accounts for 1-80% of the total weight of the liquid crystal composition.

[0107] In some embodiments of the present invention, the compound of general formula M is particularly preferably selected from the group consisting of compounds of general formula M1, general formula M2, general formula M3, general formula M7, general formula M8, general formula M9, ​​general formula M11, general formula M12, general formula M13, general formula M14, general formula M17, general formula M18, general formula M19, general formula M20 and general formula M21.

[0108] In some embodiments of the present invention, the compound of general formula M is particularly preferably selected from the group consisting of compounds of general formula M1, general formula M2, general formula M3, general formula M7, general formula M8, general formula M9, ​​general formula M11, general formula M12, general formula M17, general formula M18, general formula M19 and general formula M20.

[0109] When reliability is important, the group consisting of compounds of formula M1, formula M2, formula M3, formula M7, formula M8, formula M9, ​​formula M11, formula M12, formula M13, formula M14, formula M17, formula M18, formula M19, formula M20 and formula M21 includes R M1 and R M2 Where the volatility of the compound is reduced, the group consisting of the compounds of the general formula M1, the general formula M2, the general formula M3, the general formula M7, the general formula M8, the general formula M9, ​​the general formula M11, the general formula M12, the general formula M13, the general formula M14, the general formula M17, the general formula M18, the general formula M19, the general formula M20 and the general formula M21 includes R M1 and R M2 and when the viscosity reduction is important, the group consisting of compounds of the general formula M1, the general formula M2, the general formula M3, the general formula M7, the general formula M8, the general formula M9, ​​the general formula M11, the general formula M12, the general formula M13, the general formula M14, the general formula M17, the general formula M18, the general formula M19, the general formula M20 and the general formula M21 includes R M1 and R M2 A compound wherein at least one of the groups is an alkenyl group.

[0110] In some embodiments of the present invention, the compound of the general formula M1 is particularly preferably selected from the group consisting of the following compounds:

[0111]

[0112] as well as

[0113]

[0114] in,

[0115] R M1 independently represent a straight chain or branched alkyl or alkoxy group containing 1 to 8 carbon atoms, or a straight chain or branched alkenyl or alkenyloxy group containing 2 to 8 carbon atoms;

[0116] R M11 and R M21 Each independently represents a straight chain or branched chain alkyl or alkoxy group containing 1 to 8 carbon atoms.

[0117] Regarding the weight percentage of the compound of general formula M1 in the liquid crystal composition of the present invention, it is preferred that: relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of general formula M1 in the liquid crystal composition of the present invention is 0%, 1%, 2%, 3%, 5%, 7%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50% or 55%; relative to the total weight of the liquid crystal composition of the present invention, the preferred upper limit of the weight percentage of the compound of general formula M1 in the liquid crystal composition of the present invention is 70%, 65%, 60%, 55%, 50%, 45%, 40%, 35%, 30% or 25%.

[0118] In some embodiments of the present invention, the compound of formula M1 is preferably selected from the group consisting of compounds of formula M1-a, formula M1-b and formula M1-h.

[0119] In some embodiments of the present invention, R M1 Preferably, it is a straight-chain or branched alkyl group having 1 to 5 carbon atoms, or a straight-chain or branched alkenyl group having 2 to 5 carbon atoms; more preferably, it is a straight-chain or branched alkyl group or alkenyl group having 2 to 5 carbon atoms.

[0120] In some embodiments of the present invention, in order to particularly improve the response time, the compound R in the general formula M1-a and / or the general formula M1-b is particularly preferred. M1 A compound which is ethyl or n-propyl.

[0121] Relative to the total weight of the liquid crystal composition of the present invention, R M1 The preferred lower limit of the weight percentage of the compound representing ethyl or n-propyl in the liquid crystal composition of the present invention is 0%, 1%, 5%, 10%, 15%, 17%, 20%, 23%, 25%, 27% or 30%; relative to the total weight of the liquid crystal composition of the present invention, R in the compound of general formula M1-a M1 The preferred upper limit value of the weight percentage of the compound representing ethyl or n-propyl in the liquid crystal composition of the present invention is 60%, 55%, 50%, 45%, 42%, 40%, 38%, 35%, 33%, 30%, 28% or 25%.

[0122] Relative to the total weight of the liquid crystal composition of the present invention, R M1 The preferred lower limit of the weight percentage of the compound representing n-propyl in the liquid crystal composition of the present invention is 0%, 1%, 2%, 3%, 5%, 7% or 10%; relative to the total weight of the liquid crystal composition of the present invention, R in the compound of general formula M1-b M1The preferred upper limit of the weight percentage of the compound representing n-propyl in the liquid crystal composition of the present invention is 30%, 25%, 20%, 15%, 13%, 10%, 8%, 7%, 6%, 5% or 3%.

[0123] In some embodiments of the present invention, when it is necessary to obtain a higher clearing point through the compound of the general formula M1, it is preferred that R M1 A compound represented by butyl or pentyl; further preferably, R M1 Compounds expressed as n-butyl or n-pentyl.

[0124] Relative to the total weight of the liquid crystal composition of the present invention, R M1 The preferred lower limit of the weight percentage of the compound representing n-butyl or n-pentyl in the liquid crystal composition of the present invention is 0%, 1%, 3%, 5%, 8%, 10%, 15%, 17%, 20%, 23%, 25%, 27% or 30%; relative to the total weight of the liquid crystal composition of the present invention, the compound of general formula M1-a and / or M1-b R M1 The preferred upper limit value of the weight percentage of the compound representing n-butyl or n-pentyl in the liquid crystal composition of the present invention is 60%, 55%, 50%, 45%, 42%, 40%, 38%, 35%, 33%, 30%, 28%, 25%, 23% or 20%.

[0125] Relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of general formula M1-c in the liquid crystal composition of the present invention is 0%, 1%, 5%, 10%, 13%, 15%, 17% or 20%; relative to the total weight of the liquid crystal composition of the present invention, the preferred upper limit of the weight percentage of the compound of general formula M1-c in the liquid crystal composition of the present invention is 25%, 23%, 20%, 17%, 15%, 13% or 10%.

[0126] Relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of general formula M1-d in the liquid crystal composition of the present invention is 0%, 1%, 5%, 10%, 13%, 15%, 17% or 20%; relative to the total weight of the liquid crystal composition of the present invention, the preferred upper limit of the weight percentage of the compound of general formula M1-d in the liquid crystal composition of the present invention is 25%, 23%, 20%, 17%, 15%, 13% or 10%.

[0127] Relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of general formula M1-e in the liquid crystal composition of the present invention is 0%, 1%, 5%, 10%, 13%, 15%, 17% or 20%; relative to the total weight of the liquid crystal composition of the present invention, the preferred upper limit of the weight percentage of the compound of general formula M1-e in the liquid crystal composition of the present invention is 25%, 23%, 20%, 17%, 15%, 13% or 10%.

[0128] Relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of general formula M1-f in the liquid crystal composition of the present invention is 0%, 1%, 5%, 10%, 13%, 15%, 17% or 20%; relative to the total weight of the liquid crystal composition of the present invention, the preferred upper limit of the weight percentage of the compound of general formula M1-f in the liquid crystal composition of the present invention is 25%, 23%, 20%, 17%, 15%, 13% or 10%.

[0129] Relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of general formula M1-g in the liquid crystal composition of the present invention is 0%, 1%, 5%, 10%, 13%, 15%, 17% or 20%; relative to the total weight of the liquid crystal composition of the present invention, the preferred upper limit of the weight percentage of the compound of general formula M1-g in the liquid crystal composition of the present invention is 25%, 23%, 20%, 17%, 15%, 13% or 10%.

[0130] In some embodiments of the present invention, it is preferred that R M1 A compound which is ethyl or n-propyl.

[0131] Relative to the total weight of the liquid crystal composition of the present invention, R M1 The preferred lower limit of the weight percentage of the compound in which R is ethyl or n-propyl in the liquid crystal composition of the present invention is 0%, 1%, 2%, 3%, 5%, 7%, 10%, 13%, 15%, 18% or 20%; relative to the total weight of the liquid crystal composition of the present invention, the compound of the general formula M1-f and / or the general formula M1-g is M1 The preferred upper limit of the weight percentage of the ethyl or n-propyl compound in the liquid crystal composition of the present invention is 20%, 17%, 15%, 13%, 10%, 8%, 7% or 6%.

[0132] In some embodiments of the present invention, in the compound of formula M1-h, R M1 Preferably, it is a straight chain or branched chain alkyl or alkoxy group having 1 to 7 carbon atoms; more preferably, it is a straight chain or branched chain alkyl or alkoxy group having 1 to 5 carbon atoms.

[0133] Relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of the general formula M1-h in the liquid crystal composition of the present invention is 0%, 1%, 3%, 5%, 7%, 10%, 13%, 15%, 17%, 20%, 23%, 25% or 30%; relative to the total weight of the liquid crystal composition of the present invention, the preferred upper limit of the weight percentage of the compound of the general formula M1-h in the liquid crystal composition of the present invention is 60%, 55%, 50%, 45%, 40%, 37%, 35%, 33%, 30%, 27%, 25%, 23%, 20%, 17%, 15%, 13% or 10%.

[0134] In order to particularly improve the response time of the liquid crystal composition of the present invention, it is preferred that R M11 is ethyl, n-propyl, butyl or pentyl, and R M21 is a compound of methyl or methoxy; in the compound of the general formula M1-h, R M11 is ethyl, n-propyl, butyl or pentyl, and R M21 is an ethyl or ethoxy compound; or a compound of the general formula M1-h wherein R M11 is n-propyl, butyl or pentyl, and R M21 A compound which is n-propyl or propoxy.

[0135] Relative to the total weight of the liquid crystal composition of the present invention, R M11 is n-propyl and R M21 The preferred lower limit of the weight percentage of the compound in which ethyl is present in the liquid crystal composition of the present invention is 0%, 1%, 2%, 3%, 5%, 7%, 10%, 13%, 15%, 18% or 20%; relative to the total weight of the liquid crystal composition of the present invention, R in the general formula M1-h M11 is n-propyl and R M21 The preferred upper limit of the weight percentage of the ethyl compound in the liquid crystal composition of the present invention is 20%, 17%, 15%, 13%, 10%, 8%, 7% or 6%.

[0136] Regarding the weight percentage of the compound of general formula M2 in the liquid crystal composition of the present invention, it is preferred that: relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of general formula M2 in the liquid crystal composition of the present invention is 0%, 1%, 2%, 3%, 5%, 7% or 10%; relative to the total weight of the liquid crystal composition of the present invention, the preferred upper limit of the weight percentage of the compound of general formula M2 in the liquid crystal composition of the present invention is 20%, 15%, 13%, 10%, 8%, 7%, 6%, 5% or 3%.

[0137] Regarding the weight percentage of the compound of general formula M3 in the liquid crystal composition of the present invention, it is preferred that: relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of general formula M3 in the liquid crystal composition of the present invention is 0%, 1%, 2%, 3%, 5%, 7% or 10%; relative to the total weight of the liquid crystal composition of the present invention, the preferred upper limit of the weight percentage of the compound of general formula M3 in the liquid crystal composition of the present invention is 20%, 15%, 13%, 10%, 8%, 7%, 6%, 5% or 3%.

[0138] Regarding the weight percentage of the compound of general formula M7 in the liquid crystal composition of the present invention, it is preferred that: relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of general formula M7 in the liquid crystal composition of the present invention is 0%, 1%, 2%, 3%, 5%, 7%, 10%, 14%, 16%, 20%, 23%, 26%, 30%, 35% or 40%; relative to the total weight of the liquid crystal composition of the present invention, the preferred upper limit of the weight percentage of the compound of general formula M7 in the liquid crystal composition of the present invention is 50%, 40%, 35%, 30%, 20%, 15%, 10% or 5%.

[0139] In some embodiments of the present invention, depending on the required properties such as solubility at low temperature, transition temperature, electrical reliability, birefringence, etc., it is preferred that R M1 is a straight or branched alkenyl group containing 2 to 4 carbon atoms, and R M2 The compound is CH3-, and the straight-chain or branched alkenyl group containing 2 to 4 carbon atoms is further preferably

[0140]

[0141] Relative to the total weight of the liquid crystal composition of the present invention, R M1 for And R M2The preferred lower limit of the weight percentage of the compound of CH3- in the liquid crystal composition of the present invention is 0%, 1%, 3%, 5%, 7%, 9%, 11%, 12%, 13%, 18% or 21%, and the preferred upper limit is 45%, 40%, 35%, 30%, 25%, 23%, 20%, 18%, 15%, 13%, 10% or 8%. When the two compounds are contained at the same time, relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the two compounds in the liquid crystal composition of the present invention is 2%, 3%, 5%, 7%, 9%, 11%, 13%, 15%, 19%, 24% or 30%, and the preferred upper limit is 45%, 40%, 35%, 30%, 25%, 23%, 20%, 18%, 15%, 13%, 11%, 9%, 7% or 5%.

[0142] Regarding the weight percentage of the compound of general formula M8 in the liquid crystal composition of the present invention, it is preferred that: relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of general formula M8 in the liquid crystal composition of the present invention is 0%, 1%, 2%, 3%, 4%, 5%, 7%, 10%, 14%, 16% or 20%; relative to the total weight of the liquid crystal composition of the present invention, the preferred upper limit of the weight percentage of the compound of general formula M8 in the liquid crystal composition of the present invention is 40%, 35%, 30%, 20%, 15%, 10% or 5%.

[0143] In some embodiments of the present invention, depending on the required properties such as solubility at low temperature, transition temperature, electrical reliability, birefringence, etc., it is preferred that R M1 is a straight or branched alkenyl group containing 2 to 4 carbon atoms, and R M2 The compound is CH3-, and the straight-chain or branched alkenyl group containing 2 to 4 carbon atoms is further preferably

[0144]

[0145] Relative to the total weight of the liquid crystal composition of the present invention, R M1 for And R M2The preferred lower limit of the weight percentage of the compound of CH3- in the liquid crystal composition of the present invention is 0%, 1%, 3%, 4%, 5%, 7%, 9%, 11%, 12%, 13%, 18% or 20%, and the preferred upper limit is 40%, 35%, 30%, 25%, 23%, 20%, 18%, 15%, 13%, 10% or 8%. When the two compounds are contained at the same time, relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the two compounds in the liquid crystal composition of the present invention is 3%, 5%, 7%, 9%, 11%, 13%, 15%, 19%, 24% or 30%, and the preferred upper limit is 40%, 35%, 30%, 25%, 23%, 20%, 18%, 15% or 13%.

[0146] Regarding the weight percentage of the compound of general formula M9 in the liquid crystal composition of the present invention, it is preferred that: relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of general formula M9 in the liquid crystal composition of the present invention is 0%, 1%, 2%, 3%, 5%, 7%, 10%, 14%, 16%, 20%, 23%, 26%, 30%, 35% or 40%; relative to the total weight of the liquid crystal composition of the present invention, the preferred upper limit of the weight percentage of the compound of general formula M9 in the liquid crystal composition of the present invention is 50%, 40%, 35%, 30%, 20%, 15%, 10% or 5%.

[0147] In some embodiments of the present invention, the compound of formula M9 is preferably R M1 is ethyl, propyl, butyl or pentyl, and R M2 is a compound in which R M1 for And R M2 is a compound wherein R M1 is n-propyl, n-butyl or n-pentyl, and R M2 A compound containing CH3O-.

[0148] Regarding the weight percentage of the compound of general formula M11 in the liquid crystal composition of the present invention, it is preferred that: relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of general formula M11 in the liquid crystal composition of the present invention is 0%, 1%, 2%, 3%, 5%, 7%, 10%, 14%, 16%, 20%, 23%, 26%, 30%, 35% or 40%; relative to the total weight of the liquid crystal composition of the present invention, the preferred upper limit of the weight percentage of the compound of general formula M11 in the liquid crystal composition of the present invention is 50%, 40%, 35%, 30%, 20%, 15%, 10% or 5%.

[0149] In some embodiments of the present invention, the compound of formula M11 is preferably R M1 and R M2 Each independently represents a compound containing a straight or branched alkyl group of 2 to 5 carbon atoms, or preferably R M1 and R M2 One of them is The other is a compound of CH3- or C2H5-.

[0150] Regarding the weight percentage of the compound of general formula M12 in the liquid crystal composition of the present invention, it is preferred that: relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of general formula M12 in the liquid crystal composition of the present invention is 0%, 1%, 2%, 3%, 5%, 7%, 10%, 12%, 14%, 16%, 18%, 20%, 23%, 26%, 30%, 35% or 40%; relative to the total weight of the liquid crystal composition of the present invention, the preferred upper limit of the weight percentage of the compound of general formula M12 in the liquid crystal composition of the present invention is 50%, 40%, 35%, 30%, 25%, 22%, 20%, 18%, 15%, 12%, 10%, 8% or 5%.

[0151] Regarding the weight percentage of the compound of general formula M13 in the liquid crystal composition of the present invention, it is preferred that: relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of general formula M13 in the liquid crystal composition of the present invention is 0%, 1%, 2%, 3%, 5%, 7%, 10%, 12%, 14%, 16%, 18%, 20%, 23%, 26%, 30%, 35% or 40%; relative to the total weight of the liquid crystal composition of the present invention, the preferred upper limit of the weight percentage of the compound of general formula M13 in the liquid crystal composition of the present invention is 50%, 40%, 35%, 30%, 25%, 22%, 20%, 18%, 15%, 12%, 10%, 8% or 5%.

[0152] Regarding the weight percentage of the compound of general formula M14 in the liquid crystal composition of the present invention, it is preferred that: relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of general formula M14 in the liquid crystal composition of the present invention is 0%, 1%, 2%, 3%, 5%, 7%, 10%, 12%, 14%, 16%, 18%, 20%, 23%, 26%, 30%, 35% or 40%; relative to the total weight of the liquid crystal composition of the present invention, the preferred upper limit of the weight percentage of the compound of general formula M14 in the liquid crystal composition of the present invention is 50%, 40%, 35%, 30%, 25%, 22%, 20%, 18%, 15%, 12%, 10%, 8% or 5%.

[0153] Regarding the weight percentage of the compound of general formula M15 in the liquid crystal composition of the present invention, it is preferred that: relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of general formula M15 in the liquid crystal composition of the present invention is 0%, 1%, 2%, 3%, 5%, 7%, 10%, 12%, 14%, 16%, 18%, 20%, 23%, 26%, 30%, 35% or 40%; relative to the total weight of the liquid crystal composition of the present invention, the preferred upper limit of the weight percentage of the compound of general formula M15 in the liquid crystal composition of the present invention is 50%, 40%, 35%, 30%, 25%, 22%, 20%, 18%, 15%, 12%, 10%, 8% or 5%.

[0154] Regarding the weight percentage of the compounds of the general formula M17 to M21 in the liquid crystal composition of the present invention, it is preferred that: relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the total weight percentage of the compounds of the general formula M17 to M21 is 0%, 1%, 2%, 3%, 5%, 7%, 10%, 14%, 16% or 20%; relative to the total weight of the liquid crystal composition of the present invention, the preferred upper limit of the total weight percentage of the compounds of the general formula M17 to M21 is 30%, 25%, 23%, 20%, 18%, 15%, 12%, 10% or 5%.

[0155] In some embodiments of the present invention, in the compound of formula N, R N1 and R N2 Preferably, it is an alkyl or alkoxy group containing 1 to 8 carbon atoms, or an alkenyl or alkenyloxy group containing 2 to 8 carbon atoms, and more preferably, it is an alkyl or alkoxy group containing 1 to 5 carbon atoms, or an alkenyl or alkenyloxy group containing 2 to 5 carbon atoms;

[0156] R N1 More preferably, it is an alkyl group containing 1 to 5 carbon atoms, or an alkenyl group containing 2 to 5 carbon atoms, and still more preferably, it is an alkyl group containing 2 to 5 carbon atoms, or an alkenyl group containing 2 to 3 carbon atoms;

[0157] R N2 More preferably, it is an alkoxy group containing 1 to 4 carbon atoms;

[0158] ring and ring Preferably

[0159] In some embodiments of the present invention, the compound of Formula N has a negative dielectric anisotropy.

[0160] In some embodiments of the present invention, the compound of formula N is selected from the group consisting of:

[0161]

[0162]

[0163]

[0164] as well as

[0165]

[0166] The liquid crystal composition of the present invention preferably contains at least one compound of the general formula N; further preferably contains at least one compound of the general formulas N2 to N7 and N10 to N19; more preferably contains 2 to 10 compounds of the general formulas N2 to N7 and N10 to N19.

[0167] In some embodiments of the present invention, the compound of formula N is preferably selected from the group consisting of compounds of formula N5, formula N6, formula N11, formula N18 and formula N23.

[0168] In some embodiments of the present invention, the compound of formula N is preferably selected from the group consisting of compounds of formula N2, formula N3, formula N5, formula N6, formula N10, formula N11, formula N12, formula N17 and formula N18.

[0169] Regarding the preferred weight percentage of the compound of general formula N in the liquid crystal composition of the present invention: relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of general formula N in the liquid crystal composition of the present invention is 0.1%, 0.5%, 1%, 3%, 5%, 10%, 13%, 14%, 15%, 18%, 20%, 23%, 25%, 28% or 30%; relative to the total weight of the liquid crystal composition of the present invention, the preferred upper limit of the weight percentage of the compound of general formula N in the liquid crystal composition of the present invention is 40%, 38%, 35%, 33%, 30%, 28%, 25%, 23%, 20%, 18%, 15% or 10%.

[0170] In some embodiments of the present invention, the compound of formula N accounts for 0.1% to 40% of the total weight of the liquid crystal composition.

[0171] In some embodiments of the present invention, when it is necessary to keep the viscosity of the liquid crystal composition of the present invention low and the response time short, it is preferred that the lower limit of the content of the compound of the general formula N is low and the upper limit is low. Further, when it is necessary to keep the clearing point of the liquid crystal composition of the present invention high and the temperature stability is good, it is preferred that the lower limit of the content of the compound of the general formula N is low and the upper limit is low. In addition, when the dielectric anisotropy is increased in order to keep the driving voltage low, it is preferred that the lower limit of the content of the compound of the general formula N is increased and the upper limit is increased.

[0172] The present invention further provides a liquid crystal composition, characterized in that the liquid crystal composition comprises:

[0173] At least one compound of formula I

[0174] as well as

[0175] At least one compound of the general formula N, the compound of the general formula N is selected from the group consisting of the following compounds:

[0176]

[0177]

[0178] and

[0179]

[0180] in,

[0181] R1 represents a straight or branched alkyl group containing 1 to 12 carbon atoms, one or more non-adjacent -CH2- in the straight or branched alkyl group containing 1 to 12 carbon atoms can be independently replaced by -C=C-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-, and one or more -H in the straight or branched alkyl group containing 1 to 12 carbon atoms can be independently replaced by -F or -Cl;

[0182] R N1 and R N2 Each independently represents a straight-chain or branched alkyl group containing 1 to 12 carbon atoms, and one or more non-adjacent -CH2- in the straight-chain or branched alkyl group containing 1 to 12 carbon atoms can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-;

[0183] ring express in, One or more -H in the ring may be replaced by -CN, -F or -Cl, and one or more -CH= in the ring may be replaced by -N=;

[0184] The weight percentage of the compound of general formula I in the liquid crystal composition is 0.1%-50%.

[0185] In addition to the above compounds, the liquid crystal composition of the present invention may also contain conventional nematic liquid crystals, smectic liquid crystals, cholesteric liquid crystals, antioxidants, ultraviolet absorbers, infrared absorbers, polymerizable monomers or light stabilizers.

[0186] Possible dopants which are preferably added to the liquid crystal composition according to the invention are shown below.

[0187]

[0188]

[0189] as well as

[0190]

[0191] In some embodiments of the present invention, preferably, the weight percentage of the dopant in the liquid crystal composition is 0-5%; more preferably, the weight percentage of the dopant in the liquid crystal composition is 0-1%.

[0192] In addition, the antioxidants, light stabilizers and other additives used in the liquid crystal composition of the present invention are preferably the following:

[0193]

[0194]

[0195]

[0196]

[0197] Here, n represents a positive integer from 1 to 20.

[0198] Preferably, the light stabilizer is selected from the light stabilizers shown below:

[0199]

[0200] In some embodiments of the present invention, preferably, the weight percentage of the light stabilizer in the liquid crystal composition is 0-5%; more preferably, the weight percentage of the light stabilizer in the liquid crystal composition is 0-1%; particularly preferably, the weight percentage of the light stabilizer in the liquid crystal composition is 0-0.1%.

[0201] Another aspect of the present invention provides a liquid crystal display device comprising the liquid crystal composition.

[0202] Beneficial effects:

[0203] The liquid crystal composition of the present invention has high optical anisotropy, high clearing point, high transmittance, high ε ⊥ / Δε, larger K ave , and good low temperature stability, so that the liquid crystal display device containing the liquid crystal composition of the present invention has a high transmittance and relatively less light scattering, and the liquid crystal composition of the present invention can enable the liquid crystal display device containing the liquid crystal composition to obtain a good display effect. In particular, in the liquid crystal composition of the present invention, when the compound of general formula I is added, the liquid crystal composition has a high optical anisotropy and a high elastic constant, so the compound of general formula I can achieve the technical effect of effectively adjusting the transmittance; and when the compound of general formula N is added, the ε of the liquid crystal composition can be effectively improved. ⊥ The inventors of the present invention surprisingly found that the compounds of formula I and formula N, when used as components of a liquid crystal composition, can effectively adjust the ε of the liquid crystal composition. ⊥ / Δε and K ave , so that the liquid crystal composition can obtain a larger ε ⊥ / Δε and K ave , which can enable the liquid crystal display device of the present invention to obtain relatively high transmittance and less light scattering, so the liquid crystal display device using the liquid crystal composition of the present invention can obtain good display effects. DETAILED DESCRIPTION

[0204] The present invention will be described below in conjunction with specific embodiments. It should be noted that the following embodiments are examples of the present invention and are only used to illustrate the present invention, but not to limit the present invention. Other combinations and various modifications within the concept of the present invention may be performed without departing from the spirit or scope of the present invention.

[0205] For ease of expression, in the following embodiments, the group structure of the liquid crystal composition is represented by the codes listed in Table 1:

[0206] Table 1 Group structure codes of liquid crystal compounds

[0207]

[0208]

[0209] Take the following compound as an example:

[0210]

[0211] If the structural formula is represented by the codes listed in Table 1, it can be expressed as: nCCGF, where n in the code represents the number of C atoms in the left-end alkyl group, for example, n is "3", which means that the alkyl group is -C3H7; C in the code represents cyclohexyl, G represents 2-fluoro-1,4-phenylene, and F represents fluorine.

[0212] The abbreviated codes for the test items in the following embodiments are as follows:

[0213] Cp clearing point (nematic-isotropic phase transition temperature, °C)

[0214] Δn optical anisotropy (589nm, 25℃)

[0215] Δε Dielectric anisotropy (1KHz, 25℃)

[0216] ε ⊥ Dielectric constant perpendicular to the molecular axis

[0217] ε ⊥ / Δε Ratio of perpendicular dielectric to dielectric

[0218] K 11 Elastic constant (“slope”, pN at 20°C)

[0219] K 22 Elastic constant ("distortion", pN at 20°C)

[0220] K 33 Elastic constant ("bending", pN at 20°C)

[0221] K ave Average elastic constant (K 11 +K 22 +K 33 Average value of

[0222] T Transmittance (DMS 505 tester, cell thickness 6μm)

[0223] LTS Low Temperature Stability

[0224] in,

[0225] The optical anisotropy was measured using an Abbe refractometer under a sodium lamp (589 nm) at 25°C.

[0226] 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, TN90 test box, 7μm thickness.

[0227] K 11 , K 22 , K 33 It is calculated by using an LCR meter and an anti-parallel friction cell to test the CV curve of the liquid crystal. The test conditions are: 7μm anti-parallel friction cell, V = 0.1 ~ 20V;

[0228] Test conditions for T transmittance: The transmittance of the dimming device at a clearing point ±10°C is tested using a DMS 505 tester, and the dimming device is an IPS type liquid crystal test box with a thickness of 3.5 μm.

[0229] Each component used in the following examples can be synthesized by a known method or obtained through commercial channels. These synthesis techniques are conventional, and each liquid crystal compound obtained meets the standards of electronic compounds after testing.

[0230] According to the ratios of the liquid crystal compositions specified in the following examples, the liquid crystal compositions are prepared. The preparation of the liquid crystal compositions is carried out according to conventional methods in the art, such as mixing in a specified ratio by heating, ultrasonic waves, suspension, etc.

[0231] The liquid crystal compositions given in the following examples were prepared and studied. The composition of each liquid crystal composition and the test results of its performance parameters are shown below.

[0232] Comparative Example 1

[0233] A liquid crystal composition of Comparative Example 1 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.

[0234] Table 2 Liquid crystal composition formula and performance parameter test

[0235]

[0236]

[0237] Example 1

[0238] The liquid crystal composition of Example 1 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.

[0239] Table 3 Liquid crystal composition formula and performance parameter test

[0240]

[0241] Example 2

[0242] The liquid crystal composition of Example 2 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.

[0243] Table 4 Liquid crystal composition formula and performance parameter test

[0244]

[0245]

[0246] Example 3

[0247] The liquid crystal composition of Example 3 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.

[0248] Table 5 Liquid crystal composition formula and performance parameter test

[0249]

[0250] Example 4

[0251] The liquid crystal composition of Example 4 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.

[0252] Table 6 Liquid crystal composition formula and performance parameter test

[0253]

[0254] Example 5

[0255] The liquid crystal composition of Example 5 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.

[0256] Table 7 Liquid crystal composition formula and performance parameter test

[0257]

[0258]

[0259] Example 6

[0260] The liquid crystal composition of Example 6 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.

[0261] Table 8 Liquid crystal composition formula and performance parameter test

[0262]

[0263]

[0264] Example 7

[0265] The liquid crystal composition of Example 7 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.

[0266] Table 9 Liquid crystal composition formula and performance parameter test

[0267]

[0268] It can be seen from the above comparative example 1 and examples 1-7 that the liquid crystal composition provided by the present invention has higher optical anisotropy, higher clearing point, higher transmittance, higher ε ⊥ / Δε, larger K ave , and good low-temperature stability, so that the liquid crystal display device containing the liquid crystal composition of the present invention has a higher transmittance and relatively less light scattering, and the liquid crystal composition of the present invention can enable the liquid crystal display device containing the liquid crystal composition to obtain a good display effect.

[0269] The above implementation modes are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A liquid crystal composition, characterized in that: The liquid crystal composition comprises: At least one compound of formula I and at least one compound of the general formula N selected from the group consisting of: and in, R1 represents a straight or branched alkyl group containing 1 to 12 carbon atoms, one or more non-adjacent -CH2- in the straight or branched alkyl group containing 1 to 12 carbon atoms can be independently replaced by -C=C-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-, and one or more -H in the straight or branched alkyl group containing 1 to 12 carbon atoms can be independently replaced by -F or -Cl; R N1 and R N2 Each independently represents a straight-chain or branched alkyl group containing 1 to 12 carbon atoms, and one or more non-adjacent -CH2- in the straight-chain or branched alkyl group containing 1 to 12 carbon atoms can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-; ring express in, One or more -H in the ring may be replaced by -CN, -F or -Cl, and one or more -CH= in the ring may be replaced by -N=; The weight percentage of the compound of general formula I in the liquid crystal composition is 0.1%-50%.

2. The liquid crystal composition according to claim 1, characterized in that: The liquid crystal composition further comprises at least one compound of formula II in, R A2 represents a straight or branched alkyl group containing 1 to 12 carbon atoms, One or more non-adjacent -CH2- in the straight or branched alkyl group containing 1 to 12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-, and one or more -H in these groups may be independently replaced by -F or -Cl; ring and ring Each independently expresses in, and One or more -CH2- in the ring may be replaced by -O-, and one or more single bonds in the ring may be replaced by double bonds, One or more -H in the ring may be replaced by -CN, -F or -Cl, and one or more -CH= in the ring may be replaced by -N=; Z A21 and Z A22 Each independently represents a single bond, -CH2CH2-, -CF2CF2-, -CO-O-, -O-CO-, -O-CO-O-, -CH=CH-, -C≡C-, -CF=CF-, -CH2O- or -OCH2-; L A21 , L A22 , L A23 and L A24 Each independently represents -H, -F, -CH3 or -Cl; X A2 represents halogen, a haloalkyl or haloalkoxy group having 1 to 5 carbon atoms, a haloalkenyl or haloalkenyloxy group having 2 to 5 carbon atoms; n A2 Represents 0, 1, 2, or 3. When n A2 =2 or 3, the ring Can be the same or different, Z A21 can be the same or different, and The compound of the general formula II does not include the compound of the general formula I.

3. The liquid crystal composition according to claim 1, characterized in that: The liquid crystal composition further comprises at least one compound of the general formula M in, R M1 and R M2 Each independently represents -H, a straight chain or branched chain alkyl group containing 1 to 12 carbon atoms, a straight chain or branched chain alkenyl group containing 2 to 12 carbon atoms, One or more non-adjacent -CH2- in the straight or branched alkyl group containing 1 to 12 carbon atoms may be independently replaced by -C≡C-, -O-, -CO-, -CO-O- or -O-CO-; ring ring and ring Each independently expresses in, One or more -CH2- in may be replaced by -O-, At most one -H in may be replaced by halogen; Z M1 and Z M2 Each independently represents a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2- or -(CH2)4-; and n M1 represents 0, 1, 2, or 3, and when n M1 =2 or 3, the ring Can be the same or different, Z M2 Can be the same or different.

4. The liquid crystal composition according to claim 1, characterized in that: The compound of formula I is selected from the group consisting of the following compounds: as well as 5. The liquid crystal composition according to claim 2, characterized in that: The compound of formula II is selected from the group consisting of the following compounds: as well as in, R A2 It represents a straight-chain or branched alkyl group containing 1-8 carbon atoms, wherein one or more non-adjacent -CH2- groups in the straight-chain or branched alkyl group containing 1-8 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-, and one or more -H groups present in these groups may be independently replaced by -F or -Cl.

6. The liquid crystal composition according to claim 2 or 5, characterized in that: The weight percentage of the compound of general formula II in the liquid crystal composition is 1%-85%.

7. The liquid crystal composition according to claim 3, characterized in that: The compound of formula M is selected from the group consisting of the following compounds: as well as 8. The liquid crystal composition according to claim 3 or 7, characterized in that: The compound of the general formula M accounts for 1-80% of the total weight of the liquid crystal composition.

9. The liquid crystal composition according to claim 1, characterized in that: The compound of the general formula N accounts for 0.1%-40% of the total weight of the liquid crystal composition.

10. A liquid crystal display device comprising the liquid crystal composition according to any one of claims 1 to 9.

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