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. In the present invention, by designing the components of the liquid crystal composition, the prepared liquid crystal composition has a larger K value, a faster response speed, a higher transmittance, a higher contrast, a smaller rotational viscosity, and appropriate optical anisotropy, dielectric anisotropy and clearing point. At the same time, the liquid crystal composition provided by the present invention has good mutual solubility, low-temperature storage performance and a wider range of use, and is suitable for fast-response, high-contrast IPS, VA, 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 composition and a liquid crystal display device, and more specifically relates 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 requirements and research on liquid crystal materials are becoming 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 represents 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 / L0×100%,

[0012] 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 should significantly affect CR. In the off state, L0 has nothing to do with the dielectric properties of the liquid crystal molecules, but is related to the LC Scattering of the liquid crystal material itself; the smaller the LC Scattering, the smaller the L0, and the CR will be significantly improved.

[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 compositionave 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 shortcomings of the prior art, the object of the present invention is to provide a liquid crystal composition and a liquid crystal display device, and more specifically to provide a liquid crystal composition and a liquid crystal display device comprising an olefinic benzothiophene compound. In the present invention, by designing the components of the liquid crystal composition, and further by using a negative liquid crystal monomer compound comprising a cycloalkenyl group and a negative liquid crystal monomer compound comprising an alkenyl group, the prepared liquid crystal composition has excellent performance and is suitable for fast response, high contrast IPS, VA, 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] wherein R1 represents -H, 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 branched-chain alkyl group having 3 to 12 carbon atoms (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12), a halogenated or unhalogenated branched-chain alkyl group having 1 to 12 carbon atoms (e.g., 1, 2, 3, 4, 5 , 6, 7, 8, 9, 10, 11 or 12) carbon atoms, halogenated or unhalogenated alkoxy containing 2-12 (for example, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms, halogenated or unhalogenated alkenyl containing 2-12 (for example, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms, halogenated or unhalogenated alkenyloxy containing 2-12 (for example, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms,

[0019] R2, R3, R4, and R5 each independently represent 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, and at least one of R4 and R5 represents an alkenyl group containing 2 to 12 carbon atoms or an alkenyloxy group containing 2 to 12 carbon atoms;

[0020] ring express

[0021] ring ring ring Each independently expresses or Among them, the One or at least two -CH2- in the ring can be independently replaced by -O-, and one or at least two single bonds in the ring can be independently replaced by double bonds; One or at least two -H in the ring can be independently replaced by -F, -Cl, -CN, -CH3 or -OCH3, and one or at least two -CH= in the ring can be independently replaced by -N=;

[0022] ring express Said 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 Representation ring A group in which the single bonds in one or at least two rings are replaced by double bonds;

[0023] L1-L6 each independently represents a halogen atom;

[0024] X1 and X2 each independently represent -O- or -S-;

[0025] Z1, Z2 and Z3 each independently represent a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, -CF2CF2-, -(CH2)4-, -CF2O- or -OCF2-;

[0026] n1 represents 0, 1 or 2. When n1 represents 2, the ring Same or different, Z1 is the same or different;

[0027] n2 represents 1 or 2. When n2 represents 2, the ring the same or different; and

[0028] n3 represents 0, 1, 2 or 3, n4 represents 0 or 1, and 0≤n3+n4≤3, wherein when n3 represents 2 or 3, the ring The same or different, Z2 the same or different.

[0029] In the present invention, by designing the components of the liquid crystal composition and further by using a negative liquid crystal monomer compound containing a cycloalkenyl group in combination with a negative liquid crystal monomer compound containing a chain alkenyl group, the prepared liquid crystal composition has a larger K value, a faster response speed, a higher transmittance, a higher contrast, a smaller rotational viscosity, and appropriate optical anisotropy, dielectric anisotropy and clearing point. At the same time, the liquid crystal composition provided by the present invention has good mutual solubility, low-temperature storage performance and a wider range of use, and is suitable for fast-response, high-contrast IPS, VA, NFFS and other display modes.

[0030] The negative liquid crystal monomer compound containing a cycloalkenyl group has the advantages of good mutual solubility, fast response, large K value, etc., and at the same time has a moderate refractive index and clearing point, and has excellent effects in both positive and negative liquid crystal materials; the negative liquid crystal monomer compound containing a cycloalkenyl group is used in combination with the negative liquid crystal monomer compound containing a chain alkenyl group to obtain an excellent K value, response speed, transmittance and contrast, and has excellent mutual solubility, thereby ensuring low-temperature storage performance and a liquid crystal composition with a wide range of uses.

[0031] The halogen atom includes a fluorine atom, a halogen atom, a bromine atom and an iodine atom (the same below).

[0032] 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.

[0033] 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:

[0034]

[0035] as well as

[0036]

[0037] Among them, the ring R1, X1, X2, L1, L2, Z1 have 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, L1 and L2 both represent fluorine atoms.

[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 (eg, two or three) 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 general 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 5% 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]

[0048] Among them, R2, R3, L3, and L4 have the same protection scope as above.

[0049] In some embodiments of the present invention, L3 and L4 both represent fluorine atoms.

[0050] In some embodiments of the present invention, the compound of formula II comprises at least one (for example, two, three, or four) compound selected from the group consisting of compounds of formula II-1, compounds of formula II-2, and compounds of formula II-3.

[0051] 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%, 12%, 15%, 20%, 25%, 30%, 36%, 40%, 45% or 50%, etc., and more preferably 12% to 36%.

[0052] 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.

[0053] 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:

[0054]

[0055]

[0056]

[0057] as well as

[0058]

[0059] In some embodiments of the present invention, L5 and L6 both represent fluorine atoms.

[0060] In some embodiments of the present invention, the compound of general formula III contains at least one (for example, three or four) compound selected from the group consisting of compounds of general formula III-6, compounds of general formula III-7, compounds of general formula III-20, compounds of general formula III-21, compounds of general formula III-26, and compounds of general formula III-32.

[0061] 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%, 2%, 4%, 5%, 7%, 10%, 12%, 15%, 18%, 20%, 23%, 25%, 27% or 30%, etc., and more preferably 4% to 15%.

[0062] 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.

[0063] In some embodiments of the present invention, the liquid crystal composition further comprises at least one compound of the general formula N:

[0064]

[0065] Among them, R N1 , 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 any two or more 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 -O-, -CO-, -CO-O- or -O-CO-;

[0066] 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=;

[0067] 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-;

[0068] L N1 and L N2 Each independently represents -H, an alkyl group containing 1 to 3 (e.g., 1, 2, or 3) carbon atoms, or a halogen atom; and

[0069] 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 Same or different.

[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]

[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 general formula N is selected from the group consisting of the compound of general formula N-2, the compound of general formula N-5, the compound of general formula N-10, the compound of general formula N-14, the compound of general formula N-16, and the compound of general formula N-22.

[0076] In some embodiments of the present invention, the R N2 It represents an alkoxy group having 1 to 8 carbon atoms.

[0077] 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%, etc., and is more preferably 10% to 30%.

[0078] 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.

[0079] In some embodiments of the present invention, the liquid crystal composition further comprises at least one compound of the general formula M:

[0080]

[0081] 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, 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-;

[0082] ring ring and 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;

[0083] 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

[0084] n M represents 0, 1, or 2, where n M When it indicates 2, the ring Same or different, Z M2 Same or different.

[0085] 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:

[0086]

[0087]

[0088] Among them, the R M1 and R M2 Has the same protection scope as above.

[0089] 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-11, compounds of general formula M-27, and compounds of general formula M-28.

[0090] 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%, 39%, 45%, 50%, 55% or 60%, etc., and more preferably 35% to 50%.

[0091] In some embodiments of the present invention, the liquid crystal composition further comprises at least one compound of formula B:

[0092]

[0093] Among them, R B1 and R B2 Each independently represents a halogen atom, -CF3, -OCF3, a 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 carbon atoms), a branched chain alkyl group having 3 to 12 carbon atoms (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 -CH2- in the above-mentioned group may be independently replaced by -O-, -CO-, -CO-O-, or -O-CO-; One or at least two non-adjacent -CH2- in the above-mentioned group may be independently replaced by -CH=CH- or -C≡C-; wherein n B5 represents an integer from 0 to 4 (e.g., it can be 0, 1, 2, 3, or 4);

[0094] 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 -CH= in one or at least two rings may be replaced by -N=;

[0095] X B represents -O-, -S-, or -CO-;

[0096] L B1 and L B2 Each independently represents -H, -F, -Cl, -CF3 or -OCF3;

[0097] 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 (e.g., it can be 0, 1, 2, 3, 4, or 5); and

[0098] 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.

[0099] In some embodiments of the present invention, the compound of formula B is any one or a combination of at least two of the compounds having the following structures:

[0100]

[0101] 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;

[0102] X B1 represents -O- or -CH2-;

[0103] The R B2 , X B , Z B1 Has the same protection scope as above.

[0104] 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:

[0105]

[0106] as well as

[0107]

[0108] Among them, the R B2 ' represents an alkyl group containing 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms;

[0109] n B3 Indicates 1, 2, 3, or 4;

[0110] X B It represents -O-, -S- or -CO-.

[0111] 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%.

[0112] 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:

[0113]

[0114] Among them, RA1 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 -CH2- in the group may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-; 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 -H in the group may be independently replaced by -F or -Cl;

[0115] ring 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; 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=;

[0116] Z A11 , Z A21 and Z A22 each independently represents a single bond, -CH2CH2-, -CF2CF2-, -CO-O-, -O-CO-, -O-CO-O-, -CH=CH-, -CF=CF-, -CH2O- or -OCH2-;

[0117] 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;

[0118] X A1 and X A2each 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;

[0119] 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;

[0120] n A12 represents 1 or 2, where n A12 When it indicates 2, the ring the same or different; and

[0121] 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.

[0122] 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:

[0123]

[0124]

[0125] as well as

[0126]

[0127] 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, wherein one or at least two non-adjacent -CH2- in the straight-chain alkyl group containing 1 to 8 carbon atoms or the branched-chain alkyl group containing 3 to 8 carbon atoms can 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;

[0128] R v and R w Each independently represents -CH2- or -O-;

[0129] v and w each independently represent 0 or 1;

[0130] L A11 , L A12 , L A11 ', L A12 ', L A14 , L A15 and L A16 Each independently represents -H or -F;

[0131] L A13 and L A13 ' each independently represents -H or -CH3; and

[0132] X A1 It represents -F, -CF3 or -OCF3.

[0133] 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.

[0134] 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:

[0135]

[0136]

[0137] as well as

[0138]

[0139] Among them, R A2represents a straight-chain alkyl group containing 1-8 (for example, 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms, or a branched-chain alkyl group containing 3-8 (for example, 3, 4, 5, 6, 7 or 8) carbon atoms, wherein one or at least two non-adjacent -CH2- in the straight-chain alkyl group containing 1-8 carbon atoms or the branched-chain alkyl group containing 3-8 carbon atoms can 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 1-8 carbon atoms or the branched-chain alkyl group containing 3-8 carbon atoms can be independently replaced by -F or -Cl;

[0140] L A21 , L A22 , L A23 , L A24 and L A25 each independently represents -H or -F; and

[0141] X A2 It represents -F, -CF3, -OCF3 or -CH2CH2CH=CF2.

[0142] 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.

[0143] 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.

[0144] In some embodiments of the present invention, the liquid crystal composition further comprises at least one polymerizable compound of the general formula RM:

[0145]

[0146] Among them, R P1represents -H, a halogen atom, -CN, -Sp2-P2, 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, 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 -CH2- in the group may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-, and one or at least two -H groups may be independently replaced by -F or -Cl;

[0147] ring and 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 of the -H in the above-mentioned group may be independently replaced by -F, -Cl, -CN, -Sp3-P3, a halogenated or unhalogenated straight-chain alkyl group having 1-12 carbon atoms (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12 carbon atoms), a halogenated or unhalogenated straight-chain alkoxy group having 1-11 carbon atoms (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or 11 carbon atoms), Replacement, -CH= in one or at least two rings can be replaced by -N= independently;

[0148] ring express Among them, the ring One or at least two of the -H in the above-mentioned group may be independently replaced by -F, -Cl, -CN, -Sp3-P3, a halogenated or unhalogenated straight-chain alkyl group having 1-12 carbon atoms (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12 carbon atoms), a halogenated or unhalogenated straight-chain alkoxy group having 1-11 carbon atoms (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or 11 carbon atoms), Replacement, -CH= in one or at least two rings can be independently replaced by -N=, and X0 represents -O-, -S-, -CO-, -CF2-, -NH- or -NF-;

[0149] P1, P2 and P3 each independently represent a polymerizable group;

[0150] Sp1, Sp2 and Sp3 each independently represent a spacer group or a single bond;

[0151] Z C1 and Z C2 Each independently represents -O-, -S-, -CO-, -CO-O-, -O-CO-, -O-CO-O-, -CH2O-, -OCH2-, -CH2S-, -SCH2-, -CF2O-, -OCF2-, -CF2S-, -SCF2-, -(CH2) d -, -CF2CH2-, -CH2CF2-, -(CF2) d -, -CH=CH-, -CF=CF-, -CH=CF-, -CF=CH-, -C≡C-, -CH=CH-CO-O-, -O-CO-CH=CH-, -CH2CH2-CO-O-, -O-CO-CH2CH2-, -CHR 1 -、-CR 1 R 2 - or a single bond, where R 1 and R 2 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, or a branched-chain alkyl group having 3 to 12 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms, and d represents an integer of 1 to 4 (e.g., 1, 2, 3 or 4);

[0152] 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.

[0153] 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.

[0154] In some embodiments of the present invention, the polymerizable groups P1, P2 and P3 each independently represent

[0155] or -SH, preferably or -SH; more preferably

[0156] 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 a mesogen group and a polymerizable group in a polymerizable compound. Typical spacer groups are, for example, -(CH2)p1-, -(CH2CH2O)q1-CH2CH2-, -(CH2CH2S)q1-CH2CH2-, -(CH2CH2NH)q1-CH2CH2-, -CR 0 R 00 -(CH2)p1- or -(SiR 0 R 00 -O)p1-, wherein p1 represents an integer from 1 to 12, q1 represents an integer from 1 to 3, and R 0 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 -(CH2)p1-, -(CH2)p1-O-, -(CH2)p1-O-CO-, -(CH2)p1-CO-O-, -(CH2)p1-O-CO-O- or -CR 0 R 00 -(CH2)p1-.

[0157] 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:

[0158]

[0159]

[0160]

[0161]

[0162] Among them, X1-X 10 and X 12 Each independently represents -F, -Cl, -Sp3-P3, a straight-chain alkyl group containing 1-5 (e.g., 1, 2, 3, 4 or 5) carbon atoms, an alkoxy group containing 1-5 (e.g., 1, 2, 3, 4 or 5) carbon atoms,

[0163] 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.

[0164] In some embodiments of the present invention, the liquid crystal composition further comprises at least one additive.

[0165] The additives include nematic liquid crystal, smectic liquid crystal, cholesteric liquid crystal, dopant, antioxidant, ultraviolet absorber, infrared absorber, polymerizable monomer or light stabilizer.

[0166] In some embodiments of the present invention, the dopant comprises any one or a combination of at least two of the following compounds:

[0167]

[0168] as well as

[0169]

[0170] 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%.

[0171] In some embodiments of the present invention, the antioxidant, light stabilizer, ultraviolet absorber and other additives are preferably the following compounds:

[0172]

[0173]

[0174]

[0175] 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.

[0176] 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:

[0177]

[0178] 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%.

[0179] 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%.

[0180] In a second aspect, the present invention provides a liquid crystal display device, comprising the liquid crystal composition as described in the first aspect.

[0181] Compared with the prior art, the present invention has the following beneficial effects:

[0182] In the present invention, by designing the components of the liquid crystal composition and further by using a negative liquid crystal monomer compound containing a cycloalkenyl group in combination with a negative liquid crystal monomer compound containing a chain alkenyl group, the prepared liquid crystal composition has a larger K value, a faster response speed, a higher transmittance, a higher contrast, a smaller rotational viscosity, and appropriate optical anisotropy, dielectric anisotropy and clearing point. At the same time, the liquid crystal composition provided by the present invention has good mutual solubility, low-temperature storage performance and a wider range of use, and is suitable for fast-response, high-contrast IPS, VA, NFFS and other display modes. DETAILED DESCRIPTION

[0183] 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.

[0184] 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:

[0185] Table 1

[0186]

[0187]

[0188] In Table 1, the dotted lines represent the insertion sites of the groups.

[0189] Take the following compound as an example:

[0190]

[0191] 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.

[0192] In the following examples and comparative examples, the abbreviations of the performance test items are shown in Table 2:

[0193] Table 2 Abbreviation codes for performance test items

[0194] Test project code meaning Cp Clearing point (nematic-isotropic phase transition temperature, °C) Δn Optical anisotropy (589nm, 20℃) Δε Dielectric anisotropy (1KHz, 20℃) <![CDATA[K 11 ]]> Elastic constant of the exhibition area <![CDATA[K 33 ]]> Bending elastic constant <![CDATA[γ1]]> Rotational viscosity (20℃) / mPa·s Τ Response time (ms) <![CDATA[T r ]]> Penetration rate (%) CR Contrast LTS(-40℃) Low temperature storage stability (stored at -40°C and observed crystal precipitation time, h)

[0195] Wherein, Δn: measured using an Abbe refractometer under a sodium lamp (589 nm) at 20°C;

[0196] Cp (℃): Tested by melting point quantitative method;

[0197] 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;

[0198] 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;

[0199] γ1 (mPa·s): obtained by testing using the LCM-2 liquid crystal property evaluation system; test conditions: 20°C, 160-240V, test box thickness 20μm;

[0200] τ(ms): measured using a DMS505 tester at 25°C, test conditions: 20°C, V100 drive, negative IPS test cell with a cell thickness of 3.5μm;

[0201] 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 with a box thickness of 3.5μm.

[0202] 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;

[0203] LTS: The nematic liquid crystal medium is placed in a 6 μm VA test box and stored at a constant temperature of -40°C. The time is recorded when crystal precipitation is observed.

[0204] Comparative Example 1

[0205] 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:

[0206]

[0207] Comparative Example 2

[0208] 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:

[0209]

[0210] Comparative Example 3

[0211] 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:

[0212]

[0213]

[0214] Example 1

[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] From the comparison between Example 1 and Comparative Examples 1-3, it can be seen that the liquid crystal composition of the present invention optimizes the structures of the compound of Formula I, the compound of Formula II and the compound of Formula III, so that the liquid crystal composition containing the compound has appropriate optical anisotropy, appropriate clearing point, appropriate absolute value of dielectric anisotropy, and a 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.

[0218] Example 2

[0219] 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:

[0220]

[0221]

[0222] From the comparison between Example 2 and Comparative Examples 1-3, it can be seen that the liquid crystal composition of the present invention optimizes the structures of the compound of Formula I, the compound of Formula II and the compound of Formula III, so that the liquid crystal composition containing the compound has appropriate optical anisotropy, appropriate clearing point, appropriate absolute value of dielectric anisotropy, and a 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.

[0223] Example 3

[0224] 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:

[0225]

[0226] From the comparison between Example 3 and Comparative Examples 1-3, it can be seen that the liquid crystal composition of the present invention optimizes the structures of the compound of Formula I, the compound of Formula II and the compound of Formula III, so that the liquid crystal composition containing the compound has appropriate optical anisotropy, appropriate clearing point, appropriate absolute value of dielectric anisotropy, and a 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.

[0227] Example 4

[0228] 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:

[0229]

[0230]

[0231] Example 5

[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 6

[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 7

[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 8

[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] Example 9

[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] Example 10

[0248] 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:

[0249]

[0250] Embodiment 11

[0251] 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:

[0252]

[0253] In summary, the present invention designs the components of the liquid crystal composition, and further uses a negative liquid crystal monomer compound containing a cycloalkenyl group in combination with a negative liquid crystal monomer compound containing a chain alkenyl group to prepare a liquid crystal composition having a larger K value, a faster response speed, a higher transmittance, a higher contrast, a smaller rotational viscosity, and appropriate optical anisotropy, dielectric anisotropy, and clearing point. At the same time, the liquid crystal composition provided by the present invention has good mutual solubility, low-temperature storage performance, and a wider range of use, and is suitable for fast-response, high-contrast IPS, VA, NFFS and other display modes.

[0254] 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 formula I-1, at least one compound of formula II and at least one compound of formula III: wherein R1 represents -H, a halogenated or unhalogenated straight-chain alkyl group having 1 to 12 carbon atoms, a halogenated or unhalogenated branched-chain alkyl group having 3 to 12 carbon atoms, a halogenated or unhalogenated alkoxy group having 1 to 12 carbon atoms, a halogenated or unhalogenated alkenyl group having 2 to 12 carbon atoms, a halogenated or unhalogenated alkenyloxy group having 2 to 12 carbon atoms, R2, R3, R4, and 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, and at least one of R4 and R5 represents an alkenyl group containing 2 to 12 carbon atoms or an alkenyloxy group containing 2 to 12 carbon atoms; ring express ring ring Each independently expresses Among them, the One or at least two -CH2- in the ring can be independently replaced by -O-, and one or at least two single bonds in the ring can be independently replaced by double bonds; One or at least two -H in the ring can be independently replaced by -F, -Cl, -CN, -CH3 or -OCH3, and one or at least two -CH= in the ring can be independently replaced by -N=; ring express Said 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 Representation ring A group in which the single bonds in one or at least two rings are replaced by double bonds; L1 and L2 both represent fluorine atoms; L3-L6 each independently represents a halogen atom; X1 represents -O-; X2 represents -O- or -S-; Z2 and Z3 each independently represent a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, -CF2CF2-, -(CH2)4-, -CF2O- or -OCF2-; 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 0≤n3+n4≤3, wherein when n3 represents 2 or 3, the ring Same or different, Z2 same or different; The weight percentage of the compound of formula I-1 is 0.1% to 30%; The weight percentage of the compound of formula II is 0.1% to 50%; The weight percentage of the compound of general formula III is 0.1% to 30%.

2. 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.

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

4. The liquid crystal composition according to claim 3, characterized in that: In the liquid crystal composition, the weight percentage of the compound of formula I-1 is 5% to 16%.

5. The liquid crystal composition according to claim 1, characterized in that: The compound of 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.

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

7. The liquid crystal composition according to claim 1, characterized in that: The liquid crystal composition comprises at least two compounds of the general formula II.

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 12% 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 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: The liquid crystal composition includes at least two compounds of the general formula III.

12. 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 4% to 15%.

13. 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 N: Among them, R N1 , 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, Among them, one or any two or more 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 -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; and 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 Same or different.

14. The liquid crystal composition according to claim 13, 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 13.

15. The liquid crystal composition according to claim 14, 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 16. The liquid crystal composition according to claim 13, characterized in that: In the liquid crystal composition, the weight percentage of the compound of the general formula N is 0.1% to 30%.

17. The liquid crystal composition according to claim 16, characterized in that: In the liquid crystal composition, the weight percentage of the compound of the general formula N is 10% to 30%.

18. 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: 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 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.

19. The liquid crystal composition according to claim 18, 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 18.

20. The liquid crystal composition according to claim 19, 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 21. The liquid crystal composition according to claim 18, characterized in that: In the liquid crystal composition, the weight percentage of the compound of the general formula M is 0.1% to 60%.

22. The liquid crystal composition according to claim 21, characterized in that: In the liquid crystal composition, the weight percentage of the compound of the general formula M is 35% to 50%.

23. 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, -CF3, -OCF3, A straight chain alkyl group containing 1 to 12 carbon atoms, a branched chain alkyl group containing 3 to 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 -CH2- in the above-mentioned group may be independently replaced by -O-, -CO-, -CO-O-, or -O-CO-; One or at least two non-adjacent -CH2- in the above-mentioned group may be independently replaced by -CH=CH- or -C≡C-; wherein n B5 Represents an integer from 0 to 4; ring ring Each independently expresses in, and 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; and 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.

24. The liquid crystal composition according to claim 23, 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 23.

25. The liquid crystal composition according to claim 24, 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: Among them, the R B2 ' represents an alkyl group containing 1 to 8 carbon atoms; n B3 Indicates 1, 2, 3, or 4; X B It represents -O-, -S- or -CO-.

26. The liquid crystal composition according to claim 23, characterized in that: In the liquid crystal composition, the weight percentage of the compound of general formula B is 0.1% to 20%.

27. The liquid crystal composition according to claim 26, characterized in that: In the liquid crystal composition, the weight percentage of the compound of general formula B is 1% to 10%.

28. 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 27.

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