Liquid crystal composition and liquid crystal display device

Abstract

The present invention provides a liquid crystal composition and a liquid crystal display device. The liquid crystal composition comprises at least one compound of general formula I, at least one compound of general formula II and at least one compound of general formula III. The liquid crystal composition provided in the present invention has appropriate optical anisotropy, appropriate clearing point, appropriate absolute value of dielectric anisotropy, larger K value, smaller rotational viscosity, shorter response time, higher transmittance, higher contrast and longer low-temperature storage time. The liquid crystal display device prepared thereby has excellent performance and is suitable for fast response, high contrast VA, IPS, NFFS and other display modes.

Description

Technical Field

[0001] The present invention belongs to the technical field of liquid crystal materials, and specifically relates to a liquid crystal display device, and more specifically to a liquid crystal composition containing an olefinic benzothiophene compound and a liquid crystal display device. Background Art

[0002] Liquid Crystal Display (LCD) has developed rapidly due to its small size, light weight, low power consumption and excellent display quality, and has been widely used in portable electronic information products. As the size of LCD screens used in portable computers, office applications, and video applications increases, LCDs can be used for large-screen displays and eventually replace cathode ray tube (CRT) displays.

[0003] Compared with traditional display devices and display materials, liquid crystal display materials have obvious advantages: low driving voltage, low power consumption, high reliability, large amount of displayed information, color display, no flicker, no harm to the human body, automated production process, low cost, can be made into various specifications and types of liquid crystal displays, easy to carry, etc. Due to these advantages, liquid crystal display technology has had a profound impact on the display and imaging field, and promoted the development of microelectronics technology and optoelectronic information technology. Liquid crystal materials have been widely used in many display occasions due to their good optical properties and photoelectric effects. Therefore, the research on liquid crystal materials has become more and more in-depth.

[0004] 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, higher dielectric constant and low-temperature reliability, and the improvement of these performances requires the improvement of liquid crystal materials.

[0005] According to the transmittance formula of IPS mode, T∝|Δε| / ε ⊥ (T represents transmittance, “∝” represents the “inverse proportional” relationship, ε ⊥ Indicates the dielectric constant perpendicular to the molecular axis). To increase the transmittance of liquid crystal, we can try to reduce the Δε of the liquid crystal medium, 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 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 is to be improved, increasing Δn*d can also be considered, but the delay design of each product is fixed.

[0006] On the other hand, based on the traditional IPS-LCD light leakage performance test, it was found that the main causes of light leakage problems in liquid crystal display devices are: light scattering (LC scattering), rubbing uniformity, color filter film leakage (CF / TFT scattering) and polarization ability. Among them, light scattering accounts for 63% of the factors affecting light leakage performance.

[0007] According to the following relationship: LC Scattering∝

[0008] Where d is the spacing of the liquid crystal cell, n e is the extraordinary refractive index, n o represents the ordinary refractive index.

[0009] To improve the light scattering of liquid crystal materials, it is necessary to increase the average elastic constant K ave (Among them, K ave =(K 11 +K 22 +K 33 ) / 3) to improve light scattering and increase K ave In this case, light leakage of the liquid crystal material can be reduced.

[0010] In addition, the relationship between contrast (CR) and brightness (L) is as follows:

[0011] CR=L 255 / L 0 ×100%,

[0012] Among them, L 255 is the on-state brightness, L 0 is the off-state brightness. It can be seen that the one that significantly affects CR should be L 0 In the off state, L 0 It has nothing to do with the dielectric properties of liquid crystal molecules, but is related to the LC Scattering of the liquid crystal material itself; the smaller the LC Scattering, the higher the L 0 The smaller it is, the higher the CR will be.

[0013] In view of the above situation, the common methods for improving contrast and transmittance can be considered from the following two aspects: (1) keeping the dielectric anisotropy Δε of the liquid crystal composition unchanged by increasing ε ⊥ It can effectively improve the transmittance; (2) increase the average elastic constant K of the liquid crystal composition ave The value of ε can make the liquid crystal molecules more orderly and leak less light, thereby improving the transmittance. ⊥ / △ε ratio is small, K ave The value is small, resulting in insufficient transmittance, slow response, poor low-temperature storage performance, etc. Therefore, how to provide a liquid crystal composition that can solve the above problems is still a technical problem to be solved in the art. Summary of the invention

[0014] In view of the deficiencies of the prior art, the object of the present invention is to provide a liquid crystal composition and a liquid crystal display device. In the present invention, by designing the specific composition of the liquid crystal composition, and further by using the compound of the general formula I containing a cycloalkenyl group in combination with the compound of the general formula II and the compound of the general formula III, the prepared liquid crystal composition has appropriate optical anisotropy, appropriate clearing point, appropriate absolute value of dielectric anisotropy, larger K value, smaller rotational viscosity, shorter response time, higher transmittance, higher contrast and longer low-temperature storage time, so that the liquid crystal display device containing the liquid crystal composition of the present invention has a wider temperature use range, lower threshold voltage, better contrast, faster response speed, faster refresh speed and higher transmittance, and is suitable for fast response, high contrast VA, IPS, NFFS and other display modes.

[0015] To achieve this object, the present invention adopts the following technical solutions:

[0016] In a first aspect, the present invention provides a liquid crystal composition, comprising at least one compound of formula I, at least one compound of formula II and at least one compound of formula III:

[0017]

[0018] Among them, R 1represents -H, a halogenated or unhalogenated straight-chain alkyl group having 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, a halogenated or unhalogenated branched-chain alkyl group having 3 to 12 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, a halogenated or unhalogenated alkoxy group having 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, a halogenated or unhalogenated alkenyl group having 2 to 12 (e.g., 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, a halogenated or unhalogenated alkenyloxy group having 2 to 12 (e.g., 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms,

[0019] R 2 ~R 5 each independently represents a straight-chain alkyl group having 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms, a branched-chain alkyl group having 3 to 12 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms, an alkoxy group having 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms, an alkenyl group having 2 to 12 (e.g., 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms, an alkenyloxy group having 2 to 12 (e.g., 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms,

[0020] ring express

[0021] ring express in One or at least two of the 2 - may be replaced by -O-, and the single bonds in one or at least two rings may be replaced by double bonds; One or at least two of the -H in the above-mentioned may be independently replaced by -F, -Cl, -CN, -CH 3 or -OCH 3 Replacement, -CH= in one or at least two rings may be replaced by -N=;

[0022] ring express One or at least two of the 2- may be replaced by -O-, a single bond in one or at least two rings may be replaced by a double bond, and at least one ring One or at least two of the rings have single bonds replaced by double bonds;

[0023] ring ring Each independently expresses One or at least two of the -H in the above-mentioned may be independently replaced by -F, -Cl, -CN, -CH 3 or -OCH 3 Replacement, -CH= in one or at least two rings may be replaced by -N=;

[0024] L 1 -L 6 each independently represents a halogen atom;

[0025] X 1 , X 2 Each independently represents -O- or -S-;

[0026] Z 1 Represents a single bond, -CO-O-, -O-CO-, -CH 2 O-、-OCH 2 -、-CH=CH-、-C≡C-、-CH 2 CH 2 -、-CF 2 CF 2 -、-(CH 2 ) 4 -、-CF 2 O- or -OCF 2 -;

[0027] n 1 Represents 0, 1, or 2. When n 1 When it indicates 2, the ring Same or different, Z 1 Same or different;

[0028] n 2 represents 1 or 2, when n 2 When it indicates 2, the ring the same or different; and

[0029] n 3 Represents 0, 1, 2, or 3, n 4 Represents 0 or 1, and 2≤n 3 +n 4 ≤3; when n 3 When it means 2 or 3, the ring Same or different.

[0030] Negative liquid crystal monomer compounds containing cycloalkenyl groups are a relatively new type of liquid crystal monomer materials in recent years. Compared with conventional negative monomers, negative monomers with cycloalkenyl groups have advantages such as good mutual solubility, fast response, and large K value in liquid crystal mixtures, and usually have moderate refractive index and clearing point, and have excellent effects in both positive and negative liquid crystal materials.

[0031] In the present invention, the liquid crystal composition prepared by using the negative compound containing a cycloalkenyl group (the compound of general formula I) in combination with the compound of general formula II and / or the compound of general formula III has appropriate optical anisotropy, appropriate clearing point, appropriate absolute value of dielectric anisotropy, and a large K value (K 11 , K 33 ), smaller rotational viscosity, shorter response time, higher transmittance, higher contrast, longer low-temperature storage time and excellent mutual solubility, so that the liquid crystal display device containing the liquid crystal composition of the present invention has a wider temperature use range, lower threshold voltage, better contrast, faster response speed, faster refresh speed and higher transmittance, and is suitable for fast-response display modes such as VA, IPS, NFFS, etc.

[0032] In the present invention, the halogen atom includes a fluorine atom, a chlorine atom, a bromine atom and an iodine atom (the same below).

[0033] The following are preferred technical solutions of the present invention, but are not intended to limit the technical solutions provided by the present invention. Through the following preferred technical solutions, the objectives and beneficial effects of the present invention can be better achieved and realized.

[0034] In some embodiments of the present invention, the compound of formula I is any one or a combination of at least two of the compounds having the following structures:

[0035]

[0036] as well as

[0037] Among them, the ring R 1 , X 1 , X 2 , L 1 , L 2 , Z 1 Has the same protection scope as above.

[0038] In some embodiments of the present invention, the ring express

[0039] In some embodiments of the present invention, the L 1 , L 2 represents a fluorine atom.

[0040] In some embodiments of the present invention, the compound of formula I is compound I-1.

[0041] In some embodiments of the present invention, the liquid crystal composition comprises at least two compounds of the general formula I.

[0042] In some embodiments of the present invention, in the liquid crystal composition, the weight percentage of the compound of formula I is 0.1% to 30%, for example, it can be 0.1%, 0.2%, 0.5%, 1%, 2%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28% or 30%, etc., further preferably 1% to 20%, and further preferably 4% to 16%.

[0043] In some embodiments of the present invention, it is preferred to adjust the content of the compound of formula I so that the liquid crystal composition containing it has appropriate optical anisotropy, appropriate clearing point, appropriate absolute value of dielectric anisotropy, and a larger K value (K 11 , K 33 ), smaller rotational viscosity, shorter response time, higher transmittance, higher contrast and longer low-temperature storage time.

[0044] In some embodiments of the present invention, the compound of formula II is any one or a combination of at least two of the following compounds:

[0045]

[0046] as well as

[0047] Among them, the R 2 , R 3 , L 3 , L 4 Has the same protection scope as above.

[0048] In some embodiments of the present invention, the L 3 , L 4 All represent fluorine atoms.

[0049] In some embodiments of the present invention, the liquid crystal composition includes at least two (eg, three or four) compounds of the general formula II.

[0050] In some embodiments of the present invention, in the liquid crystal composition, the weight percentage of the compound of formula II is 0.1% to 50%, for example, it can be 0.1%, 0.2%, 0.5%, 1%, 2%, 5%, 10%, 15%, 20%, 25%, 30%, 36%, 40%, 45% or 50%, etc., and is more preferably 15% to 36%.

[0051] In some embodiments of the present invention, it is preferred to adjust the content of the compound of formula II so that the liquid crystal composition containing it has appropriate optical anisotropy, appropriate clearing point, appropriate absolute value of dielectric anisotropy, and a larger K value (K 11 , K 33 ), smaller rotational viscosity, shorter response time, higher transmittance, higher contrast and longer low-temperature storage time.

[0052] In some embodiments of the present invention, the compound of formula III is any one or a combination of at least two of the compounds having the following structures:

[0053]

[0054]

[0055] as well as

[0056] Among them, the R 4 , R 5 , L 5 , L 6 Has the same scope of protection as above;

[0057] In some embodiments of the present invention, the L 5 , L 6 All represent fluorine atoms.

[0058] In some embodiments of the present invention, the liquid crystal composition includes at least two (eg, three or four) compounds of the general formula III.

[0059] In some embodiments of the present invention, the liquid crystal composition comprises at least one (eg, two or three) R 4 represents a compound of the general formula III containing an alkenyl group having 2 to 12 (e.g. 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms.

[0060] In some embodiments of the present invention, in the liquid crystal composition, the weight percentage of the compound of formula III is 0.1% to 30%, for example, it can be 0.1%, 0.2%, 0.5%, 1%, 3%, 5%, 7%, 10%, 12%, 15%, 18%, 20%, 23%, 25%, 27% or 30%, etc., and more preferably 3% to 15%.

[0061] In some embodiments of the present invention, it is preferred to adjust the content of the compound of formula III so that the liquid crystal composition containing it has appropriate optical anisotropy, appropriate clearing point, appropriate absolute value of dielectric anisotropy, and a larger K value (K 11 , K 33 ), smaller rotational viscosity, shorter response time, higher transmittance, higher contrast and longer low-temperature storage time.

[0062] In some embodiments of the present invention, the liquid crystal composition further comprises at least one compound of the general formula N:

[0063]

[0064] Among them, R N1 and R N2 Each independently represents a straight chain alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms, a branched chain alkyl group containing 3 to 12 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms, Among them, one or at least two non-adjacent -CH 2 - may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-;

[0065] ring and ring Each independently expresses in One or at least two of the 2 - can be replaced by -O-; One or at least two -H in the ring may be independently replaced by -F, -Cl or -CN, and one or at least two -CH= in the ring may be replaced by -N=;

[0066] Z N1 and Z N2 Each independently represents a single bond, -CO-O-, -O-CO-, -CH 2 O-、-OCH 2-、-CH=CH-、-C≡C-、-CH 2 CH 2 -、-CF 2 CF 2 -、-(CH 2 ) 4 -、-CF 2 O- or -OCF 2 -;

[0067] L N1 and L N2 Each independently represents -H, an alkyl group containing 1 to 3 carbon atoms or a halogen atom;

[0068] n N1 Represents 0, 1, 2, or 3, n N2 Represents 0 or 1, and 0≤n N1 +n N2 ≤3, where n N1 When it means 2 or 3, the ring Same or different, Z N1 the same or different; and

[0069] The compound of the general formula N does not contain a substituted or unsubstituted terphenyl structure, and the substituted substituent is selected from -F, -Cl or -CN.

[0070] In some embodiments of the present invention, the compound of the general formula N is any one or a combination of at least two of the compounds having the following structures:

[0071]

[0072]

[0073] as well as

[0074] Among them, the R N1 and R N2 Has the same protection scope as above.

[0075] In some embodiments of the present invention, the compound of the general formula N is selected from the group consisting of compounds of the general formula N-2, compounds of the general formula N-5, compounds of the general formula N-10, compounds of the general formula N-14, compounds of the general formula N-16, and compounds of the general formula N-19. In some embodiments of the present invention, in the liquid crystal composition, the weight percentage of the compound of the general formula N is 0.1% to 30%, for example, it can be 0.1%, 0.2%, 0.5%, 1%, 2%, 5%, 7%, 10%, 12%, 15%, 18%, 20%, 23%, 25%, 27% or 30%, and more preferably 5% to 25%.

[0076] In some embodiments of the present invention, it is preferred to adjust the content of the compound of the general formula N so that the liquid crystal composition containing it has appropriate optical anisotropy, appropriate clearing point, appropriate absolute value of dielectric anisotropy, and a larger K value (K 11 , K 33 ), smaller rotational viscosity, shorter response time, higher transmittance, higher contrast and longer low-temperature storage time.

[0077] In some embodiments of the present invention, the liquid crystal composition further comprises at least one compound of the general formula M:

[0078]

[0079] Among them, R M1 , R M2 Each independently represents a straight chain alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms, a branched chain alkyl group containing 3 to 12 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms, Among them, one or at least two non-adjacent -CH 2 - may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-;

[0080] ring ring and ring Each independently expresses in One or at least two of the 2 - may be replaced by -O-, and the single bonds in one or at least two rings may be replaced by double bonds; At most one -H in can be replaced by a halogen atom;

[0081] ZM1 and Z M2 Each independently represents a single bond, -CO-O-, -O-CO-, -CH 2 O-、-OCH 2 -、-C≡C-、-CH=CH-、-CH 2 CH 2 -or-(CH 2 ) 4 -;and

[0082] n M represents 0, 1, or 2, where n M When it indicates 2, the ring Same or different, Z M2 Same or different.

[0083] In some embodiments of the present invention, the compound of the general formula M is any one or a combination of at least two of the compounds having the following structures:

[0084]

[0085] as well as

[0086] Among them, the R M1 and R M2 Has the same protection scope as above.

[0087] In some embodiments of the present invention, the compound of general formula M is selected from the group consisting of compounds of general formula M-1, compounds of general formula M-2, compounds of general formula M-4, compounds of general formula M-13, compounds of general formula M-15, and compounds of general formula M-28.

[0088] In some embodiments of the present invention, in the liquid crystal composition, the weight percentage of the compound of the general formula M is 0.1% to 60%, for example, it can be 0.1%, 0.2%, 0.5%, 1%, 2%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55% or 60%, etc., and more preferably 30% to 50%.

[0089] In some embodiments of the present invention, the liquid crystal composition further comprises at least one compound of formula B:

[0090]

[0091] Among them, R B1 and R B2Each independently represents a halogen atom, a halogenated or unhalogenated straight-chain alkyl group having 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms, a halogenated or unhalogenated branched-chain alkyl group having 3 to 12 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms, The halogenated or unhalogenated straight-chain alkyl group containing 1 to 12 carbon atoms, the halogenated or unhalogenated branched-chain alkyl group containing 3 to 12 carbon atoms, One or more non-adjacent -CH 2 - may be independently replaced by -CH=CH-, -CH=CF-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-;

[0092] ring ring Each independently expresses in One or at least two non-adjacent -CH 2 - may be replaced by -O-, and the single bonds in one or at least two rings may be replaced by double bonds; One or at least two -H in the ring may be independently replaced by -CN, -F or -Cl, and -CH= in one or at least two rings may be replaced by -N=;

[0093] X B represents -O-, -S-, or -CO-;

[0094] L B1 and L B2 Each independently represents -H, -F, -Cl, -CF 3 or -OCF 3 ;

[0095] Z B1 and Z B2 Each independently represents a single bond, -CO-O-, -O-CO-, -CH 2 O-、-OCH 2 -、-CH=CH-、-C≡C-、-CH 2 CH 2 -、-CF 2 CF 2 -、-(CH 2 ) B4 -、-(CH 2 ) B4 O-、-(CH 2 ) B4 S-、-CF 2 O- or -OCF 2 -, where nB4 represents an integer from 0 to 5 (for example, it can be 0, 1, 2, 3, 4 or 5);

[0096] n B1 and n B2 Each independently represents 0, 1 or 2, where n B1 When it indicates 2, the ring Same or different; when n B2 When it indicates 2, the ring Same or different, Z B2 Same or different.

[0097] In some embodiments of the present invention, the compound of general formula B is any one or a combination of at least two of the compounds having the following structures:

[0098] as well as

[0099] Among them, R B1 ' represents an alkyl group containing 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms, an alkoxy group containing 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms, or an alkenyl group containing 2-8 (e.g., 2, 3, 4, 5, 6, 7 or 8) carbon atoms;

[0100] X B1 Indicates -O- or -CH 2 -;

[0101] The R B2 , X B , Z B1 Has the same protection scope as above.

[0102] In some embodiments of the present invention, the compound of formula B-1 is any one or a combination of at least two of the compounds having the following structures:

[0103]

[0104] as well as

[0105] Among them, R B2 ' represents an alkyl group containing 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms;

[0106] The RB1 ′、X B 、n B4 Has the same protection scope as above.

[0107] n B3 Indicates 1, 2, 3, or 4;

[0108] n B5 Indicates 0, 1, 2, 3, or 4.

[0109] In some embodiments of the present invention, in the liquid crystal composition, the weight percentage of the compound of general formula B is 0.1% to 20%, for example, it can be 0.1%, 0.2%, 0.5%, 1%, 2%, 4%, 5%, 7%, 8%, 10%, 12%, 14%, 16%, 18% or 20%, etc., and more preferably 1% to 10%.

[0110] In some embodiments of the present invention, in order to apply the liquid crystal composition of the present invention to a high-transmittance liquid crystal display, the liquid crystal composition further comprises at least one compound of the general formula A-1 and / or at least one compound of the general formula A-2:

[0111]

[0112] Among them, R A1 and R A2 Each independently represents a straight chain alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms, a branched chain alkyl group containing 3 to 12 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms, Among them, the straight chain alkyl group containing 1 to 12 carbon atoms, the branched chain alkyl group containing 3 to 12 carbon atoms, One or at least two non-adjacent -CH 2 - may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-, and one or at least two -H in the straight-chain alkyl group containing 1 to 12 carbon atoms or the branched-chain alkyl group containing 3 to 12 carbon atoms may be independently replaced by -F or -Cl;

[0113] ring ring ring and ring Each independently expresses in One or at least two of the 2 - may be replaced by -O-, and the single bonds in one or at least two rings may be replaced by double bonds; One or at least two -H in the ring may be independently replaced by -F, -Cl or -CN, and one or at least two -CH= in the ring may be replaced by -N=;

[0114] Z A11 , Z A21 and Z A22 Each independently represents a single bond, -CH 2 CH 2 -、-CF 2 CF 2 -, -CO-O-, -O-CO-, -O-CO-O-, -CH=CH-, -CF=CF-, -CH 2 O- or -OCH 2 -;

[0115] L A11 , L A12 , L A13 , L A21 and L A22 Each independently represents -H, an alkyl group containing 1 to 3 (e.g., 1, 2 or 3) carbon atoms, or a halogen atom;

[0116] X A1 and X A2 Each independently represents a halogen atom, a haloalkyl group having 1 to 5 (e.g., 1, 2, 3, 4 or 5) carbon atoms, a haloalkoxy group having 1 to 5 (e.g., 1, 2, 3, 4 or 5) carbon atoms, a haloalkenyl group having 2 to 5 (e.g., 2, 3, 4 or 5) carbon atoms, or a haloalkenyloxy group having 2 to 5 (e.g., 2, 3, 4 or 5) carbon atoms;

[0117] n A11 represents 0, 1, 2, or 3, where n A11 When it means 2 or 3, the ring Same or different, Z A11 Same or different;

[0118] n A12 represents 1 or 2, where n A12 When it indicates 2, the ring Same or different;

[0119] n A2 represents 0, 1, 2, or 3, where n A2 When it means 2 or 3, the ring Same or different, Z A21 Same or different.

[0120] In some embodiments of the present invention, the compound of the general formula A-1 is any one or a combination of at least two of the compounds having the following structures:

[0121]

[0122]

[0123] as well as

[0124] Among them, R A1 represents a straight-chain alkyl group containing 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms, a branched-chain alkyl group containing 3 to 8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms, Among them, one or at least two non-adjacent -CH 2 - may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-, and the straight-chain alkyl group containing 1 to 8 carbon atoms, the branched-chain alkyl group containing 3 to 8 carbon atoms, One or at least two -H in the group may be independently replaced by -F or -Cl;

[0125] R v and R w Each independently represents -CH 2 -or-O-;

[0126] v and w each independently represent 0 or 1;

[0127] L A11 , L A12 , L A11 ',L A12 ',L A14 , L A15 and L A16 Each independently represents -H or -F;

[0128] L A13 and L A13 'Each independently represents -H or -CH 3 ;and

[0129] X A1 Indicates -F, -CF 3 or -OCF 3 .

[0130] In some embodiments of the present invention, in the liquid crystal composition, the weight percentage of the compound of the general formula A-1 is 0.1% to 50%, for example, it can be 0.1%, 1%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 46%, 48% or 50%, etc.

[0131] In some embodiments of the present invention, the compound of formula A-2 is any one or a combination of at least two of the compounds having the following structures:

[0132]

[0133] as well as

[0134] Among them, R A2 represents a straight-chain alkyl group containing 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms, or a branched-chain alkyl group containing 3 to 8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms, wherein one or at least two non-adjacent -CH 2 - may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-, and one or at least two -H in a straight-chain alkyl group containing 1 to 8 carbon atoms or a branched-chain alkyl group containing 3 to 8 carbon atoms may be independently replaced by -F or -Cl;

[0135] L A21 , L A22 , L A23 , L A24 and L A25 each independently represents -H or -F; and

[0136] X A2 Indicates -F, -CF 3 、-OCF 3 or -CH 2 CH 2 CH=CF 2 .

[0137] In some embodiments of the present invention, in the liquid crystal composition, the weight percentage of the compound of the general formula A-2 is 0.1% to 50%, for example, it can be 0.1%, 1%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 46%, 48% or 50%, etc.

[0138] In some embodiments of the present invention, in the liquid crystal composition, the sum of the weight percentages of the compound of the general formula A-1 and the compound of the general formula A-2 is 0.1% to 60%, for example, it can be 0.1%, 1%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, 50%, 52%, 54%, 56%, 58% or 60%, etc.

[0139] In some embodiments of the present invention, the liquid crystal composition further comprises at least one polymerizable compound of the general formula RM:

[0140]

[0141] Among them, R P1 Indicates -H, halogen atom, -CN, -Sp 2 -P 2 , a straight chain alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms, a branched chain alkyl group containing 3 to 12 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms, Among them, the straight chain alkyl group containing 1 to 12 carbon atoms, the branched chain alkyl group containing 3 to 12 carbon atoms, One or at least two non-adjacent -CH 2 - may be each independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-, and one or at least two -H may each independently be replaced by -F or -Cl;

[0142] ring and ring Each independently expresses in One or at least two non-adjacent -CH 2 - may be replaced by -O-, and the single bonds in one or at least two rings may be replaced by double bonds; One or at least two of the -H in the above-mentioned may be independently replaced by -F, -Cl, -CN, -Sp 3 -P 3 , a halogenated or unhalogenated straight-chain alkyl group having 1 to 12 carbon atoms (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12), a halogenated or unhalogenated straight-chain alkoxy group having 1 to 11 carbon atoms (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or 11), Replacement, -CH= in one or at least two rings can be replaced by -N= independently;

[0143] ring express Among them, the ring One or at least two of the -H in the above-mentioned may be independently replaced by -F, -Cl, -CN, -Sp 3 -P 3 , a halogenated or unhalogenated straight-chain alkyl group having 1 to 12 carbon atoms (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12), a halogenated or unhalogenated straight-chain alkoxy group having 1 to 11 carbon atoms (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or 11), In one or at least two rings, -CH= can be replaced by -N= independently, X 0 Indicates -O-, -S-, -CO-, -CF 2 -, -NH- or -NF-;

[0144] P 1 , P 2 and P 3 each independently represents a polymerizable group;

[0145] Sp 1 、Sp 2 and Sp 3 each independently represents a spacer group or a single bond;

[0146] Z C1 and Z C2 Each independently represents -O-, -S-, -CO-, -CO-O-, -O-CO-, -O-CO-O-, -CH 2 O-、-OCH 2 -、-CH 2 S-、-SCH 2 -、-CF 2 O-、-OCF 2 -、-CF 2 S-, -SCF 2-、-(CH 2 ) d -、-CF 2 CH 2 -、-CH 2 CF 2 -、-(CF 2 ) d -, -CH=CH-, -CF=CF-, -CH=CF-, -CF=CH-, -C≡C-, -CH=CH-CO-O-, -O-CO-CH=CH-, -CH 2 CH 2 -CO-O-, -O-CO-CH 2 CH 2 -、-CHR 1 -、-CR 1 R 2 - or a single bond, where R 1 and R 2 Each independently represents a straight-chain alkyl group containing 1-12 (for example, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms, a branched-chain alkyl group containing 3-12 (for example, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms, and d represents an integer of 1-4 (for example, 1, 2, 3 or 4);

[0147] a represents 0, 1 or 2, b represents 0 or 1, wherein when a represents 2, the ring Same or different, Z C1 Same or different.

[0148] The polymerizable groups involved in the present invention are groups suitable for polymerization reactions (e.g., free radical or ionic polymerization, addition polymerization or condensation polymerization), or groups suitable for addition or condensation on the polymer backbone. For chain polymerization, polymerizable groups containing -CH=CH- or -C≡C- are particularly preferred, and for ring-opening polymerization, for example, oxetane or epoxy groups are particularly preferred.

[0149] In some embodiments of the present invention, the polymerizable group P 1 , P 2 and P 3 Each independently expresses or -SH, preferably or -SH; more preferably

[0150] It should be noted that the term "spacer group" is known to those skilled in the art and is described in the literature (e.g., Pure Appl. Chem. 2001, 73 (5), 888 and C. Tschierske, G. Pelzl, S. Diele, Angew. Chem. 2004, 116, 6340-6368). As used herein, the term "spacer group" refers to a flexible group that connects the mesogen group and the polymerizable group in a polymerizable compound. A typical spacer group is, for example, -(CH 2 ) 1 -、-(CH 2 CH 2 O)q 1 -CH 2 CH 2 -、-(CH 2 CH 2 S)q 1 -CH 2 CH 2 -、-(CH 2 CH 2 NH)q 1 -CH 2 CH 2 -、-CR0R 00 -(CH 2 ) 1 -or-(SiR 0 R 00 -O)p 1 -, where p 1 Integer from 1 to 12, q 1 Integers from 1 to 3, R0 and R 00 Each independently represents -H, a straight or branched alkyl group containing 1 to 12 carbon atoms, or a cyclic alkyl group containing 3 to 12 carbon atoms. In the present invention, the spacer group is preferably -(CH 2 ) 1 -、-(CH 2 ) 1 -O-、-(CH 2 ) 1 -O-CO-, -(CH 2 ) 1 -CO-O-, -(CH 2 ) 1 -O-CO-O-or-CR0R 00 -(CH 2 ) 1 -.

[0151] In some embodiments of the present invention, the compound of the general formula RM is any one or a combination of at least two of the compounds having the following structures:

[0152]

[0153]

[0154]

[0155] as well as

[0156] Among them, X 1 -X 10 and X 12 Each independently represents -F, -Cl, -Sp 3 -P 3 , a straight chain alkyl group containing 1 to 5 (e.g., 1, 2, 3, 4 or 5) carbon atoms, an alkoxy group containing 1 to 5 (e.g., 1, 2, 3, 4 or 5) carbon atoms,

[0157] In some embodiments of the present invention, in the liquid crystal composition, the weight percentage of the polymerizable compound of the general formula RM is 0.001%-5%, for example, 0.001%, 0.002%, 0.004%, 0.005%, 0.006%, 0.008%, 0.01%, 0.02%, 0.04%, 0.06%, 0.08%, 0.1%, 0.2%, 0.25%, 0.26%, 0.27%, 0.28%, 0.29%, 0.3%, 0.32%, 0.33%, 0.34%, 0.35%, 0.4%, 0.5%, 0.6%, 0.8%, 1%, 1.2%, 1.6%, 1.8%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5% or 5%, etc.

[0158] In some embodiments of the present invention, the liquid crystal composition further comprises at least one additive.

[0159] The additives include nematic liquid crystal, smectic liquid crystal, cholesteric liquid crystal, dopant, antioxidant, ultraviolet absorber, infrared absorber, polymerizable monomer or light stabilizer.

[0160] In some embodiments of the present invention, the dopant comprises any one or a combination of at least two of the following compounds:

[0161]

[0162] as well as

[0163] In some embodiments of the present invention, in the liquid crystal composition, the weight percentage of the dopant is 0% to 5%, for example, it can be 0%, 0.01%, 0.05%, 0.1%, 0.2%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5% or 5%, etc., and more preferably 0.01%-1%.

[0164] In some embodiments of the present invention, the antioxidant, light stabilizer, ultraviolet absorber and other additives are preferably the following compounds:

[0165]

[0166]

[0167]

[0168] Herein, n represents a positive integer of 1-12, for example, it can be 1, 2, 4, 6, 8, 9, 10, 11 or 12, etc.

[0169] In some embodiments of the present invention, the antioxidant is selected from any one or a combination of at least two of the following compounds:

[0170]

[0171] In some embodiments of the present invention, in the liquid crystal composition, the weight percentage of the light stabilizer is 0% to 5%, for example, it can be 0%, 0.01%, 0.05%, 0.1%, 0.2%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5% or 5%, etc., and more preferably 0.01% to 1%.

[0172] It should be noted that, for the convenience of calculation, in the present invention, the sum of the weight percentages of compounds with different general formulas in the liquid crystal composition is 100%, and the content of additives is not included in the total content of the liquid crystal composition, that is, the addition of additives will make the total content of each component in the liquid crystal composition greater than 100%.

[0173] In some embodiments of the present invention, the liquid crystal composition further includes a polymerization initiator, which illustratively includes but is not limited to: benzoin ethers, benzophenones, acetophenones, benzil ketals, acylphosphine oxides, and the like.

[0174] In a second aspect, the present invention provides a liquid crystal display device, comprising the liquid crystal composition as described in the first aspect.

[0175] Compared with the prior art, the present invention has the following beneficial effects:

[0176] In the present invention, the specific composition of the liquid crystal composition is designed, and further, the compound of the general formula I containing a cycloalkenyl group is used in combination with the compound of the general formula II and the compound of the general formula III, so that the prepared liquid crystal composition has appropriate optical anisotropy, appropriate clearing point, appropriate absolute value of dielectric anisotropy, larger K value, smaller rotational viscosity, shorter response time, higher transmittance, higher contrast and longer low-temperature storage time, so that the liquid crystal display device containing the liquid crystal composition of the present invention has a wider temperature use range, lower threshold voltage, better contrast, faster response speed, faster refresh speed and higher transmittance, and is suitable for fast response, high contrast VA, IPS, NFFS and other display modes. DETAILED DESCRIPTION

[0177] For the convenience of understanding the present invention, the present invention lists the following embodiments. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0178] For ease of expression, in the following examples, the group structures of the liquid crystal compositions are represented by the codes listed in Table 1:

[0179] Table 1

[0180]

[0181]

[0182] In Table 1, the dotted lines represent the insertion sites of the groups.

[0183] Take the following compound as an example:

[0184]

[0185] The structural formula can be expressed as follows: nCCGF, where n represents the number of carbon atoms in the left alkyl group. For example, if n is "3", it means that the alkyl group is -C 3 H 7 ; In the code, C represents cyclohexyl, G represents 2-fluoro-1,4-phenylene, and F represents fluorine.

[0186] In the following examples and comparative examples, the abbreviations of the performance test items are shown in Table 2:

[0187] Table 2 Abbreviation codes for performance test items

[0188]

[0189]

[0190] Wherein, Δn: measured using an Abbe refractometer under a sodium lamp (589 nm) at 20°C;

[0191] Cp (℃): Tested by melting point instrument quantitative method;

[0192] Δε: Δε=ε∥-ε⊥, where ε∥ is the dielectric constant parallel to the molecular axis, and ε⊥ is the dielectric constant perpendicular to the molecular axis; test conditions: 20℃, 1KHz, VA type test box with a box thickness of 6μm;

[0193] K 11 , K 33 :K 11 and K 33 It is obtained by using an LCR meter and a VA test box to test the capacitance-voltage characteristic curve (CV curve) of the liquid crystal material and then calculating it. The test conditions are: 6μmVA test box, V=0.1~20V;

[0194] γ 1 : Tested using LCM-2 liquid crystal property evaluation system; test conditions: 20℃, 160-240V, test box thickness 20μm;

[0195] τ: measured using a DMS505 tester at 25°C, test conditions: 20°C, V100 drive, negative IPS test box with a box thickness of 3.5μm;

[0196] T r :Use DMS 505 photoelectric comprehensive tester to test the VT curve of the dimming device, take the maximum transmittance on the VT curve as the transmittance of the liquid crystal, the test box is a negative IPS type, and the box thickness is 3.5μm;

[0197] CR: Use DMS 505 tester to test the transmittance of the liquid crystal cell at 255 grayscale voltage and 0 grayscale voltage, that is, T r255 and T r0 , by T r255 / T r0 The test conditions are: 20°C, 3.5 μm thick negative IPS test box;

[0198] LTS: The nematic liquid crystal medium is placed in a 6umVA test box and stored at a constant temperature of -40°C. The time is recorded when crystal precipitation is observed.

[0199] Comparative Example 1

[0200] This comparative example provides a liquid crystal composition, which includes components in weight percentage as shown in the following table, and is filled between two substrates of a liquid crystal display for performance testing:

[0201]

[0202]

[0203] Comparative Example 2

[0204] This comparative example provides a liquid crystal composition, which includes components in weight percentage as shown in the following table, and is filled between two substrates of a liquid crystal display for performance testing:

[0205]

[0206] Comparative Example 3

[0207] This comparative example provides a liquid crystal composition, which includes components in weight percentage as shown in the following table, and is filled between two substrates of a liquid crystal display for performance testing:

[0208]

[0209] Example 1

[0210] This embodiment provides a liquid crystal composition, which includes components in weight percentage as shown in the following table, and is filled between two substrates of a liquid crystal display for performance testing:

[0211]

[0212]

[0213] From the comparison between Comparative Examples 1-3 and Example 1, it can be seen that the liquid crystal composition of the present invention has better optical anisotropy, higher clearing point, appropriate absolute value of dielectric anisotropy, larger K value (K 11 , K 33 ), appropriate rotational viscosity, shorter response time, higher transmittance, better contrast and comparable or even better low-temperature storage stability.

[0214] Example 2

[0215] This embodiment provides a liquid crystal composition, which includes components in weight percentage as shown in the following table, and is filled between two substrates of a liquid crystal display for performance testing:

[0216]

[0217] Example 3

[0218] This embodiment provides a liquid crystal composition, which includes components in weight percentage as shown in the following table, and is filled between two substrates of a liquid crystal display for performance testing:

[0219]

[0220]

[0221] Example 4

[0222] This embodiment provides a liquid crystal composition, which includes components in weight percentage as shown in the following table, and is filled between two substrates of a liquid crystal display for performance testing:

[0223]

[0224] Example 5

[0225] This embodiment provides a liquid crystal composition, which includes components in weight percentage as shown in the following table, and is filled between two substrates of a liquid crystal display for performance testing:

[0226]

[0227]

[0228] Example 6

[0229] This embodiment provides a liquid crystal composition, which includes components in weight percentage as shown in the following table, and is filled between two substrates of a liquid crystal display for performance testing:

[0230]

[0231] Example 7

[0232] This embodiment provides a liquid crystal composition, which includes components in weight percentage as shown in the following table, and is filled between two substrates of a liquid crystal display for performance testing:

[0233]

[0234] Example 8

[0235] This embodiment provides a liquid crystal composition, which includes components in weight percentage as shown in the following table, and is filled between two substrates of a liquid crystal display for performance testing:

[0236]

[0237] Example 9

[0238] This embodiment provides a liquid crystal composition, which includes components in weight percentage as shown in the following table, and is filled between two substrates of a liquid crystal display for performance testing:

[0239]

[0240]

[0241] Example 10

[0242] This embodiment provides a liquid crystal composition, which includes components in weight percentage as shown in the following table, and is filled between two substrates of a liquid crystal display for performance testing:

[0243]

[0244] Embodiment 11

[0245] This embodiment provides a liquid crystal composition, which includes components in weight percentage as shown in the following table, and is filled between two substrates of a liquid crystal display for performance testing:

[0246]

[0247]

[0248] Example 12

[0249] This embodiment provides a liquid crystal composition, which includes components in weight percentage as shown in the following table, and is filled between two substrates of a liquid crystal display for performance testing:

[0250]

[0251] In summary, the liquid crystal composition provided by the present invention has good optical anisotropy, good clearing point, appropriate absolute value of dielectric anisotropy, large K value (K 11 , K 33), smaller rotational viscosity, shorter response time, higher transmittance, higher contrast and longer low-temperature storage time, so that the liquid crystal display device containing the liquid crystal composition of the present invention has a wider temperature use range, lower threshold voltage, better contrast, faster response speed, faster refresh speed and higher transmittance, and is particularly suitable for display modes such as VA, IPS, and NFFS.

[0252] The applicant declares that the present invention illustrates the liquid crystal composition and liquid crystal display device of the present invention through the above-mentioned embodiments, but the present invention is not limited to the above-mentioned embodiments, that is, it does not mean that the present invention must rely on the above-mentioned embodiments to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of various raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A liquid crystal composition, characterized in that: The liquid crystal composition comprises at least one compound of general formula I-1, at least two compounds of general formula II and at least two compounds of general formula III: wherein R1 represents -H, a halogenated or unhalogenated straight-chain alkyl group containing 1 to 12 carbon atoms, a halogenated or unhalogenated branched-chain alkyl group containing 3 to 12 carbon atoms, a halogenated or unhalogenated alkoxy group containing 1 to 12 carbon atoms, a halogenated or unhalogenated alkenyl group containing 2 to 12 carbon atoms, a halogenated or unhalogenated alkenyloxy group containing 2 to 12 carbon atoms, R2 to R5 each independently represent a straight chain alkyl group containing 1 to 12 carbon atoms, a branched chain alkyl group containing 3 to 12 carbon atoms, an alkoxy group containing 1 to 12 carbon atoms, an alkenyl group containing 2 to 12 carbon atoms, an alkenyloxy group containing 2 to 12 carbon atoms, ring express ring express One or at least two -CH2- in the ring may be replaced by -O-, a single bond in one or at least two rings may be replaced by a double bond, and at least one ring One or at least two of the rings have single bonds replaced by double bonds; ring ring Each independently expresses One or at least two -H in the ring may be independently replaced by -F, -Cl, -CN, -CH3 or -OCH3, and -CH= in one or at least two rings may be replaced by -N=; L1-L6 each independently represents a halogen atom; X1 and X2 each independently represent -O- or -S-; n2 represents 1 or 2. When n2 represents 2, the ring the same or different; and n3 represents 0, 1, 2 or 3, n4 represents 0 or 1, and 2≤n3+n4≤3; when n3 represents 2 or 3, the ring Same or different; In the liquid crystal composition, the weight percentage of the compound of formula I-1 is 0.1% to 30%; In the liquid crystal composition, the weight percentage of the compound of formula II is 0.1% to 50%; In the liquid crystal composition, the weight percentage of the compound of formula III is 0.1% to 30%; The liquid crystal composition further comprises at least one compound of the general formula N: Among them, R N1 and R N2 Each independently represents a straight chain alkyl group containing 1 to 12 carbon atoms, a branched chain alkyl group containing 3 to 12 carbon atoms, wherein one or at least two non-adjacent -CH2- in the straight-chain alkyl group containing 1 to 12 carbon atoms or the branched-chain alkyl group containing 3 to 12 carbon atoms can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-; ring and ring Each independently expresses in One or at least two -CH2- in the mixture may be replaced by -O-; One or at least two -H in the ring may be independently replaced by -F, -Cl or -CN, and one or at least two -CH= in the ring may be replaced by -N=; Z N1 and Z N2 Each independently represents a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, -CF2CF2-, -(CH2)4-, -CF2O- or -OCF2-; L N1 and L N2 Each independently represents -H, an alkyl group containing 1 to 3 carbon atoms or a halogen atom; n N1 Indicates 0, 1, 2, or 3, n N2 Represents 0 or 1, and 0≤n N1 +n N2 ≤3, where n N1 When it means 2 or 3, the ring Same or different, Z N1 the same or different; and The compound of the general formula N does not contain a substituted or unsubstituted terphenyl structure, and the substituted substituent is selected from -F, -Cl or -CN; In the liquid crystal composition, the weight percentage of the compound of the general formula N is 0.1% to 30%; The liquid crystal composition further comprises at least one compound of the general formula M: Among them, R M1 , R M2 Each independently represents a straight chain alkyl group containing 1 to 12 carbon atoms, a branched chain alkyl group containing 3 to 12 carbon atoms, wherein one or at least two non-adjacent -CH2- in the straight-chain alkyl group containing 1 to 12 carbon atoms or the branched-chain alkyl group containing 3 to 12 carbon atoms can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-; ring ring and ring Each independently expresses in One or at least two -CH2- in the ring may be replaced by -O-, and one or at least two single bonds in the ring may be replaced by double bonds; At most one -H in can be replaced by a halogen atom; Z M1 and Z M2 Each independently represents a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -C≡C-, -CH=CH-, -CH2CH2- or -(CH2)4-; and n M represents 0, 1, or 2, where n M When it indicates 2, the ring Same or different, Z M2 Same or different; In the liquid crystal composition, the weight percentage of the compound of the general formula M is 0.1% to 60%.

2. The liquid crystal composition according to claim 1, characterized in that: The above-mentioned L1 and L2 represent fluorine atoms.

3. The liquid crystal composition according to claim 1, characterized in that: The liquid crystal composition includes at least two compounds of the general formula I-1.

4. The liquid crystal composition according to claim 1, characterized in that: In the liquid crystal composition, the weight percentage of the compound of the general formula I-1 is 1% to 20%.

5. The liquid crystal composition according to claim 4, characterized in that: In the liquid crystal composition, the weight percentage of the compound of formula I-1 is 4% to 16%.

6. The liquid crystal composition according to claim 1, characterized in that: The compound of the general formula II is any one or a combination of at least two of the following compounds: as well as Wherein, R2, R3, L3, and L4 have the same protection scope as claim 1.

7. The liquid crystal composition according to claim 1, characterized in that: The above-mentioned L3 and L4 both represent fluorine atoms.

8. The liquid crystal composition according to claim 1, characterized in that: In the liquid crystal composition, the weight percentage of the compound of formula II is 15% to 36%.

9. The liquid crystal composition according to claim 1, characterized in that: The compound of the general formula III is any one or a combination of at least two of the compounds having the following structures: as well as Wherein, R4, R5, L5, and L6 have the same protection scope as that of claim 1.

10. The liquid crystal composition according to claim 1, characterized in that: The above-mentioned L5 and L6 both represent fluorine atoms.

11. The liquid crystal composition according to claim 1, characterized in that: In the liquid crystal composition, the weight percentage of the compound of formula III is 3% to 15%.

12. The liquid crystal composition according to claim 1, characterized in that: The compound of the general formula N is any one or a combination of at least two of the compounds having the following structures: as well as Among them, the R N1 and R N2 It has the same protection scope as claim 1.

13. The liquid crystal composition according to claim 12, characterized in that: The compound of the general formula N is any one or a combination of at least two of the compounds having the following structures: as well as 14. The liquid crystal composition according to claim 1, characterized in that: In the liquid crystal composition, the weight percentage of the compound of the general formula N is 5% to 25%.

15. The liquid crystal composition according to claim 1, characterized in that: The compound of the general formula M is any one or a combination of at least two of the compounds having the following structures: as well as Among them, the R M1 and R M2 It has the same protection scope as claim 1.

16. The liquid crystal composition according to claim 15, characterized in that: The compound of the general formula M is any one or a combination of at least two of the compounds having the following structures: as well as 17. The liquid crystal composition according to claim 1, characterized in that: In the liquid crystal composition, the weight percentage of the compound of the general formula M is 30% to 50%.

18. The liquid crystal composition according to claim 1, characterized in that: The liquid crystal composition further comprises at least one compound of general formula B: Among them, R B1 and R B2 Each independently represents a halogen atom, a halogenated or unhalogenated straight-chain alkyl group containing 1 to 12 carbon atoms, a halogenated or unhalogenated branched-chain alkyl group containing 3 to 12 carbon atoms, The halogenated or unhalogenated straight-chain alkyl group containing 1 to 12 carbon atoms, the halogenated or unhalogenated branched-chain alkyl group containing 3 to 12 carbon atoms, One or more non-adjacent -CH2- can be independently replaced by -CH=CH-, -C≡C-, -CH=CF-, -O-, -CO-, -CO-O- or -O-CO-; ring ring Each independently expresses in One or at least two non-adjacent -CH2- in the ring may be replaced by -O-, and one or at least two single bonds in the ring may be replaced by double bonds; One or at least two -H in the ring may be independently replaced by -CN, -F or -Cl, and one or at least two -CH= in the ring may be replaced by -N=; X B represents -O-, -S-, or -CO-; L B1 and L B2 Each independently represents -H, -F, -Cl, -CF3 or -OCF3; Z B1 and Z B2 Each independently represents a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, -CF2CF2-, -(CH2)n B4 -、-(CH2)n B4 O-、-(CH2)n B4 S-, -CF2O- or -OCF2-, where n B4 Represents an integer from 0 to 5; n B1 and n B2 Each independently represents 0, 1 or 2, where n B1 When it indicates 2, the ring Same or different; when n B2 When it indicates 2, the ring Same or different, Z B2 Same or different.

19. The liquid crystal composition according to claim 18, characterized in that: The compound of the general formula B is any one or a combination of at least two of the compounds having the following structures: as well as Among them, R B1 ' represents an alkyl group containing 1 to 8 carbon atoms, an alkoxy group containing 1 to 8 carbon atoms, or an alkenyl group containing 2 to 8 carbon atoms; X B1 represents -O- or -CH2-; The R B2 , X B , Z B1 It has the same protection scope as claim 18.

20. The liquid crystal composition according to claim 19, characterized in that: The compound of the general formula B-1 is any one or a combination of at least two of the compounds having the following structures: as well as Among them, R B2 ' represents an alkyl group containing 1 to 8 carbon atoms; R B1 ' represents an alkyl group containing 1 to 8 carbon atoms, an alkoxy group containing 1 to 8 carbon atoms, or an alkenyl group containing 2 to 8 carbon atoms; X B1 represents -O- or -CH2-; n B4 Represents an integer from 0 to 5; n B3 Indicates 1, 2, 3, or 4; n B5 Indicates 0, 1, 2, 3, or 4.

21. The liquid crystal composition according to claim 18, characterized in that: In the liquid crystal composition, the weight percentage of the compound of general formula B is 0.1% to 20%.

22. The liquid crystal composition according to claim 21, characterized in that: In the liquid crystal composition, the weight percentage of the compound of general formula B is 1% to 10%.

23. A liquid crystal display device, characterized in that: The liquid crystal display device comprises the liquid crystal composition according to any one of claims 1 to 22.

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