Liquid crystal composition, liquid crystal display device containing liquid crystal composition, and use thereof

Abstract

The present application relates to a liquid crystal composition, a liquid crystal display device containing the liquid crystal composition, and a use thereof. The liquid crystal composition comprises at least one compound of general formula I containing a cyclohexene structure and at least one positive-polarity N-type compound containing an oxygen-substituted cyclohexane structure, wherein the N-type compound is selected from the group consisting of a compound of general formula N-1 and a compound of general formula N-2. The liquid crystal composition of the present application has a large elastic constant, high contrast, and a good flicker value while maintaining a high clearing point, appropriate optical anisotropy, and appropriate dielectric anisotropy, can effectively improve the display effect of a liquid crystal material so that a liquid crystal display device comprising the liquid crystal composition has a small threshold voltage and a wide temperature application range, and can be widely applied to IPS liquid crystal display modes with high contrast and a quick response.

Description

Liquid crystal composition, liquid crystal display device containing the same and application thereof Technical Field

[0001] The present application belongs to the technical field of liquid crystal materials, and specifically relates to a liquid crystal composition, a liquid crystal display device containing the same, and applications thereof. Background Art

[0002] Liquid crystal displays (LCDs) have experienced rapid development due to their compact size, light weight, low power consumption, and excellent display quality. Compared to traditional display devices and materials, LCDs offer significant advantages: low driving voltage, minimal power consumption, high reliability, large amounts of displayed information, color display, flicker-free operation, no harmful effects on the human body, automated production processes, low cost, the ability to manufacture LCDs in a variety of sizes and types, and portability. These advantages have profoundly impacted the display and imaging fields, promoting the development of microelectronics and optoelectronic information technologies. Liquid crystal materials, with their excellent optical properties and photoelectric effect, have found widespread application in a wide range of display applications. However, several challenges remain, such as improving viewing angle characteristics, enhancing contrast, and increasing elastic constants.

[0003] Studies have shown that the most important factor affecting the contrast of liquid crystal display elements is light leakage of liquid crystal materials, and the main factor affecting light leakage is light scattering (LC Scattering), in which LC Scattering is closely related to the average elastic constant K ave The relationship is as follows:

[0004] Where d represents the spacing of the liquid crystal cell, n e represents the extraordinary refractive index, n o represents the ordinary light refractive index. From this relationship, we can see that LC Scattering and K ave Inversely proportional to the K ave In the case of , the light leakage of the liquid crystal material can be reduced. In addition, the relationship between contrast (CR) and brightness (L) is as follows: CR = L 255 / L0×100%,

[0005] Among them, L 255 L0 represents the brightness in the on-state, and L0 represents the brightness in the off-state. It can be seen that the change in L0 significantly affects CR. In the off-state, L0 is not related to the dielectric properties of the liquid crystal molecules, but rather to the LC scattering of the liquid crystal material itself. The smaller the LC scattering, the smaller L0, and the significantly improved CR.

[0006] In view of the above situation, the common method used to improve the transmittance of liquid crystal materials in the positive IPS mode is to increase the value of the elastic constant K of the liquid crystal composition, so that the liquid crystal molecules are better ordered and less light leakage occurs, thereby increasing the contrast and improving the transmittance. On the other hand, due to the increase in the K value, the Flicker value of the liquid crystal can also be improved.

[0007] During the use of the liquid crystal panel, the polarity switching of the common electrode signal (Vcom) generates a flickering phenomenon of horizontal stripes, which is generally referred to as the Flicker phenomenon in the industry. Among them, the numerical value of the Flicker flicker value also directly reflects the quality and reliability of the liquid crystal panel. Generally, the larger the value of the Flicker flicker value, the more likely the liquid crystal panel will produce image sticking (IS), and vice versa. When the Flicker phenomenon is severe, it will lead to increased image sticking of the liquid crystal panel, reduce the display quality, and cause physiological discomfort to the viewer (such as eye fatigue, decreased vision, and dizziness, etc.). Therefore, during the production process of the liquid crystal display, it is necessary to detect its Flicker flicker value and control its Flicker flicker value within a predetermined range.

[0008] Contrast is an important parameter of liquid crystal display devices. The contrast of liquid crystal display devices is actually the ratio of brightness, that is, the division of the blackest and whitest brightness units. More precisely, contrast is the value obtained by subtracting the saturation of the white signal at 100% and 0%, and then dividing it by the 0% white value (0% white signal is actually black) measured in Lux (illuminance, i.e. lux). Therefore, the brighter the white and the darker the black, the higher the contrast. At a reasonable brightness value, the higher the contrast of the liquid crystal display device, the richer the color gradation it can display. Summary of the Invention

[0009] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

[0010] The present application provides a liquid crystal composition, a liquid crystal display device containing the same, and applications thereof. The liquid crystal composition provided in the present application has a large elastic constant, a high contrast ratio, and a good Flicker value while maintaining a high clearing point, appropriate optical anisotropy, and appropriate dielectric anisotropy. It can effectively improve the display effect of the liquid crystal material, so that the liquid crystal display device containing the same has a low threshold voltage and a wide temperature operating range.

[0011] In a first aspect, the present application provides a liquid crystal composition, comprising: at least one compound of formula I:

[0012] as well as

[0013] At least one N-type compound, wherein the N-type compound is selected from the group consisting of compounds of formula N-1 and compounds of formula N-2:

[0014] Among them, R X1 and R X2 each independently represents a straight or branched chain alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms, One or more non-adjacent -CH2- in the linear or branched alkyl group containing 1 to 12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-;

[0015] ring and Ring Each independently expresses And ring and Ring At least one of the

[0016] R N1 and R N2 Each independently represents -H, a straight or branched chain alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms, One or more non-adjacent -CH2- in the straight or branched alkyl group containing 1 to 12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-; one or more -H in the aforementioned groups may be independently replaced by -F or -Cl;

[0017] ring ring ring and Ring Each independently expresses described One or more -CH2- in the ring may be replaced by -O-, and one or more single bonds in the ring may be replaced by double bonds; -CH= in one or more rings may be replaced by -N=; one or more -H in the aforementioned groups may be independently replaced by -F, -Cl or -CN;

[0018] Wherein, the compound of the general formula N-1 comprises at least one (for example, two)

[0019] The compound of formula N-2 comprises at least one (for example, two)

[0020] Z N11 、Z N21 and Z N22 each independently represents a single bond, -CH2CH2-, -CF2CF2-, -CO-O-, -O-CO-, -O-CO-O-, -CH=CH-, -CF=CF-, -CH2O- or -OCH2-;

[0021] L N11 , L N12 , L N13 , L N21 and L N22 each independently represents -H, halogen, or an unsubstituted or halogenated straight-chain alkyl group containing 1 to 3 (e.g., 1, 2, or 3) carbon atoms;

[0022] X N1 and X N2 each independently represents halogen, 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;

[0023] n N11 Indicates 0, 1, 2, or 3; when n N11 =2 or 3, the ring Can be the same or different, Z N11 Can be the same or different;

[0024] n N12 is 1 or 2; n N12 =2, the ring Can be the same or different;

[0025] n N2 Indicates 0, 1, 2, or 3; when n N2 =2 or 3, the ring Can be the same or different, Z N21 Can be the same or different.

[0026] In the present application, the 1-12 carbon atoms can be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12 carbon atoms.

[0027] The alkenyl group in the present application is preferably a group represented by any one of formula (V1) to formula (V9), and is particularly preferably formula (V1), formula (V2), formula (V8) or formula (V9). The groups represented by formula (V1) to formula (V9) are as follows:

[0028] Here, "X" represents a carbon atom in the ring structure to which it is bonded.

[0029] The alkenyloxy group in the present application is preferably a group represented by any one of formula (OV1) to formula (OV9), and is particularly preferably a group represented by formula (OV1), formula (OV2), formula (OV8) or (OV9). The groups represented by formula (OV1) to formula (OV9) are as follows:

[0030] "X" represents a carbon atom in a ring structure to which it is bonded.

[0031] When n N11 =2, there are two rings in the compound of the general formula N-1 These two rings They may have the same structure or different structures. For example, one may be Another one is When the application involves the expression "same or different", they all have the same meaning.

[0032] In the present application, “can be replaced by…” means that it can be replaced or not replaced, that is, replacement or not replacement falls within the scope of protection of the present application. The same applies to “can be replaced by…”, and the positions of “replacement” and “replacement” can be arbitrary.

[0033] In this application, the short straight lines on one or both sides of the group structure represent access bonds, not methyl groups, e.g. The short straight line on the left, Short straight lines on both sides.

[0034] In the present application, the halogens may be F, Cl, Br or I, etc.; when the same descriptions are mentioned below, they have the same meanings.

[0035] The following are preferred technical solutions of this application, but are not intended to limit the technical solutions provided in this application. Through the following preferred technical solutions, the objectives and beneficial effects of this application can be better achieved and realized.

[0036] In some embodiments of the present application, the R X1 and R X2Each independently 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, a straight-chain alkoxy group containing 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms, a branched-chain alkoxy group containing 3 to 8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms, a straight-chain alkenyl group containing 2 to 8 (e.g., 2, 3, 4, 5, 6, 7 or 8) carbon atoms, or a branched-chain alkenyl group containing 3 to 8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms.

[0037] In some embodiments of the present application, the compound of formula I is selected from the group consisting of the following compounds:

[0038] as well as

[0039] Among them, R X1 and R X2 It has the same definition as that in the general formula I.

[0040] In some embodiments of the present application, on the basis of maintaining a higher clearing point, appropriate optical anisotropy and appropriate dielectric anisotropy, in order to obtain a larger elastic constant, a higher contrast and a better Flicker flicker value, the compound of general formula I contains at least one (for example, two, three, four or five) compounds of general formula I-1.

[0041] In some embodiments of the present application, in order to obtain a larger elastic constant, a higher contrast ratio, and a better Flicker flicker value while maintaining a relatively high clearing point, appropriate optical anisotropy, and appropriate dielectric anisotropy, the compound of general formula I comprises at least one (e.g., two, three, four, or five) compound selected from the group consisting of the following compounds:

[0042] as well as

[0043] Among them, R X1 and R X2 each independently 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;

[0044] R X11 and R X21each independently represents a straight-chain alkenyl group containing 2 to 8 (e.g., 2, 3, 4, 5, 6, 7, or 8) carbon atoms or a branched-chain alkenyl group containing 3 to 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms;

[0045] R X12 and R X22 Each independently represents a straight-chain alkoxy group containing 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms or a branched-chain alkoxy group containing 3 to 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms.

[0046] In some embodiments of the present application, the content of the compound of formula I is preferably adjusted so that the liquid crystal composition containing the compound has a larger elastic constant, a higher contrast ratio, and a better Flicker value.

[0047] In some embodiments of the present application, the mass percentage of the compound of general formula I in the liquid crystal composition is 0.1%-40% (including any numerical value or sub-range between this range), for example, 0.1%, 1%, 2%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, or a range between any two of the numerical values.

[0048] Preferably, the mass percentage of the compound of formula I in the liquid crystal composition is 0.1%-20%.

[0049] In some embodiments of the present application, the mass percentage of at least one compound selected from the general formula I-1 is 1%-20% (including any numerical value or sub-range between this range), for example, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 13%, 15%, 17%, 19%, 20%, or a range between any two values ​​therein.

[0050] In some embodiments of the present application, the mass percentage of at least one compound of general formula I selected from the group consisting of compounds of general formula I-1-1, compounds of general formula I-1-2, compounds of general formula I-1-4 and compounds of general formula I-1-5 is 2%-20% (including any values ​​and sub-ranges between this range), for example, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 13%, 15%, 17%, 19%, 20%, or a range between any two values.

[0051] In some embodiments of the present application, the R N1 and R N2Each independently 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, a straight-chain alkoxy group containing 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms, a branched-chain alkoxy group containing 3 to 8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms, a straight-chain alkenyl group containing 2 to 8 (e.g., 2, 3, 4, 5, 6, 7 or 8) carbon atoms, or a branched-chain alkenyl group containing 3 to 8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms.

[0052] In some embodiments of the present application, the Z N11 、Z N21 and Z N22 Each independently represents a single bond, -CH2CH2-, -CH=CH-, -CH2O- or -OCH2-.

[0053] In some embodiments of the present application, the L N11 , L N12 , L N13 , L N21 and L N22 Each independently represents -CH3, -CF3, -H or halogen.

[0054] In some embodiments of the present application, the X N1 、X N2 Each independently represents -F, -CF3 or -OCF3.

[0055] In some embodiments of the present application, the compound of formula N-1 is selected from the group consisting of the following compounds:

[0056] as well as

[0057] Among them, R N1 Having the same defined range as in the general formula N-1;

[0058] L N11 , L N12 , L N11 '、L N12 '、L N14 , L N15 and L N16 Each independently represents -H or -F;

[0059] L N13 and L N13 'Each independently represents -H or -CH3;

[0060] X N1 represents -F, -CF3 or -OCF3;

[0061] R v and R w Each independently represents -CH2- or -O-; and v and w each independently represent 0 or 1.

[0062] In some embodiments of the present application, the compound of formula N-2 is selected from the group consisting of the following compounds:

[0063] as well as

[0064] Among them, R N2 Having the same defined range as in the general formula N-2;

[0065] L N21 , L N22 , L N23 , L N24 and L N25 Each independently represents -H or -F;

[0066] X N2 Indicates -F, -CF3 or -OCF3.

[0067] In some embodiments of the present application, on the basis of maintaining a higher clearing point, appropriate optical anisotropy and appropriate dielectric anisotropy, in order to obtain a larger elastic constant, a higher contrast and a better Flicker flicker value, the N-type compound contains at least one (for example, two, three, four or five) N-type compounds selected from the group consisting of compounds of general formula N-1 and compounds of general formula N-2.

[0068] In some embodiments of the present application, on the basis of maintaining a higher clearing point, appropriate optical anisotropy and appropriate dielectric anisotropy, in order to obtain a larger elastic constant, a higher contrast and a better Flicker flicker value, the N-type compound contains at least one (for example, two, three, four or five) N-type compounds selected from the group consisting of compounds of the general formula N-1-1, compounds of the general formula N-1-2, compounds of the general formula N-1-11, compounds of the general formula N-2-1, compounds of the general formula N-2-4, compounds of the general formula N-2-9 and compounds of the general formula N-2-10.

[0069] In some embodiments of the present application, the compound of formula N-1 is selected from the group consisting of the following compounds:

[0070] as well as

[0071] Among them, R N1 Having the same defined range as in the general formula N-1;

[0072] X N1 Each independently represents -F, -CF3 or -OCF3.

[0073] In some embodiments of the present application, R N1 It represents a straight-chain alkyl group containing 1 to 5 carbon atoms.

[0074] In some embodiments of the present application, X N1 Indicates -F.

[0075] In some embodiments of the present application, the compound of formula N-2 is selected from the group consisting of the following compounds:

[0076] as well as

[0077] Among them, R N2 Having the same defined range as in the general formula N-2;

[0078] X N2 Indicates -F, -CF3 or -OCF3.

[0079] In some embodiments of the present application, R N2 It represents a straight-chain alkyl group containing 1 to 5 carbon atoms.

[0080] In some embodiments of the present application, X N2 Indicates -F.

[0081] In some embodiments of the present application, on the basis of maintaining a higher clearing point, appropriate optical anisotropy and appropriate dielectric anisotropy, in order to obtain a larger elastic constant, a higher contrast and a better Flicker flicker value, the N-type compound contains at least one (for example, two, three, four or five) N-type compounds selected from the group consisting of compounds of the general formula N-1-1C, compounds of the general formula N-1-2C, compounds of the general formula N-1-2D, compounds of the general formula N-1-11A, compounds of the general formula N-2-1A, compounds of the general formula N-2-4B, compounds of the general formula N-2-9A and compounds of the general formula N-2-10A.

[0082] In some embodiments of the present application, it is preferred to adjust the content of the N-type compound so that the liquid crystal composition containing it has a larger elastic constant, a higher contrast ratio, and a better Flicker value.

[0083] In some embodiments of the present application, the mass percentage of the N-type compound in the liquid crystal composition is 0.1%-40% (including any numerical value or sub-range between this range), for example, 0.1%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, or a range between any two of the numerical values.

[0084] Preferably, the mass percentage of the N-type compound in the liquid crystal composition is 0.1%-25%.

[0085] In some embodiments of the present application, the mass percentage of at least one N-type compound selected from the group consisting of compounds of general formula N-1 and compounds of general formula N-2 is 0.1%-30% (including any numerical value or sub-range between this range), for example, 0.1%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 13%, 15%, 17%, 19%, 20%, 22%, 24%, 26%, 28%, 30%, or a range between any two of the numerical values.

[0086] In some embodiments of the present application, the mass percentage of at least one N-type compound selected from the group consisting of compounds of general formula N-1-1, compounds of general formula N-1-2, compounds of general formula N-1-11, compounds of general formula N-2-1, compounds of general formula N-2-4, compounds of general formula N-2-9 and compounds of general formula N-2-10 is 1%-30% (including any numerical value or sub-range between this range), for example, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 13%, 15%, 17%, 19%, 20%, 22%, 24%, 25%, 26%, 28%, 30%, or a range between any two of the numerical values.

[0087] In some embodiments of the present application, the mass percentage of at least one N-type compound selected from the group consisting of compounds of general formula N-1-1C, compounds of general formula N-1-2C, compounds of general formula N-1-2D, compounds of general formula N-1-11A, compounds of general formula N-2-1A, compounds of general formula N-2-4B, compounds of general formula N-2-9A and compounds of general formula N-2-10A is 1%-25% (including any numerical value or sub-range between this range), for example, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, or a range between any two of the numerical values.

[0088] In some embodiments of the present application, the liquid crystal composition further comprises at least one compound of formula M:

[0089] Among them, R M1 and R M2 each independently represents a straight or branched chain alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms, One or more non-adjacent -CH2- in the linear or branched alkyl group containing 1 to 12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-;

[0090] ring ring and Ring Each independently expresses described One or more -CH2- in the ring may be replaced by -O-, and one or at most two single bonds in the ring may be replaced by double bonds; At most one -H in may be replaced by halogen;

[0091] Z M1 and Z M2 Each independently represents a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CF2CF2-, -CF2O-, -OCF2-, -CH2CH2- or -(CH2)4-;

[0092] n M Indicates 0, 1, 2, or 3; when n M =2 or 3, the ring Same or different, ZM2 Same or different; when n M = 0, the ring and Ring Not for

[0093] In some embodiments of the present application, the R M1 and R M2 and each independently 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, a straight-chain alkoxy group containing 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms, a branched-chain alkoxy group containing 3 to 8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms, a straight-chain alkenyl group containing 2 to 8 (e.g., 2, 3, 4, 5, 6, 7 or 8) carbon atoms, a branched-chain alkenyl group containing 3 to 10 (e.g., 3, 4, 5, 6, 7, 8, 9 or 10) carbon atoms,

[0094] In some embodiments of the present application, the R M1 and R M2 Any one of them is a straight-chain alkoxy group containing 1 to 8 carbon atoms, a straight-chain alkenyl group containing 2 to 8 carbon atoms, a branched-chain alkenyl group containing 3 carbon atoms, or a branched-chain alkoxy group containing 3 to 8 carbon atoms, and the other is a straight-chain alkyl group containing 1 to 8 carbon atoms or a branched-chain alkyl group containing 3 to 8 carbon atoms.

[0095] In some embodiments of the present application, the compound of formula M is selected from the group consisting of the following compounds:

[0096] as well as

[0097] Among them, the R M1 and R M2 It has the same definition as that in the general formula M.

[0098] In some embodiments of the present application, on the basis of maintaining a higher clearing point, appropriate optical anisotropy and appropriate dielectric anisotropy, in order to obtain a larger elastic constant, a higher contrast and a better Flicker flicker value, the compound of general formula M contains at least one (for example, two, three, four or five) compounds selected from the group consisting of compounds of general formula M-1, compounds of general formula M-10, compounds of general formula M-18, compounds of general formula M-26, compounds of general formula M-34, compounds of general formula M-44, compounds of general formula M-46 and compounds of general formula M-47.

[0099] In some embodiments of the present application, in order to obtain a larger elastic constant, a higher contrast ratio, and a better Flicker flicker value while maintaining a relatively high clearing point, appropriate optical anisotropy, and appropriate dielectric anisotropy, the compound of the general formula M comprises at least one (e.g., two, three, four, or five) selected from the group consisting of the following compounds:

[0100] Among them, R M1 and R M2 each independently 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;

[0101] R M11 and R M21 each independently represents a straight-chain alkenyl group containing 2 to 8 (e.g., 2, 3, 4, 5, 6, 7, or 8) carbon atoms or a branched-chain alkenyl group containing 3 to 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms;

[0102] R M22 represents a straight-chain alkoxy group containing 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms or a branched-chain alkoxy group containing 3 to 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms.

[0103] In some embodiments of the present application, the content of the compound of formula M is preferably adjusted so that the liquid crystal composition containing the compound has a larger elastic constant, a higher contrast ratio, and a better Flicker value.

[0104] In some embodiments of the present application, the mass percentage of the compound of formula M in the liquid crystal composition is 0.1%-90% (including any numerical value or sub-range between this range), for example, 0.1%, 1%, 2%, 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%, 60%, 62%, 64%, 66%, 68%, 70%, 72%, 74%, 76%, 78%, 80%, 82%, 84%, 86%, 88%, 90%, or the range between any two values.

[0105] Preferably, the mass percentage of the compound of formula M in the liquid crystal composition is 30%-80%.

[0106] In some embodiments of the present application, the mass percentage of at least one compound of the general formula M selected from the group consisting of the compound of the general formula M-1, the compound of the general formula M-10, the compound of the general formula M-18, the compound of the general formula M-26, the compound of the general formula M-34, the compound of the general formula M-44, the compound of the general formula M-46 and the compound of the general formula M-47 is 1%-80% (including any numerical value or sub-range between the ranges), for example, 1%, 2%, 4%, 6%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 77%, 78%, 79%, 80%, 80%, 80%, 80%, 80%, 80%, 80%, 80%, 80%, 80%, 80%, %, 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%, 60%, 62%, 64%, 66%, 68%, 70%, 72%, 74%, 76%, 78%, 80%, or a range between any two values.

[0107] In some embodiments of the present application, at least one compound selected from the group consisting of compounds of formula M-1-1, compounds of formula M-1-3, compounds of formula M-10-2, compounds of formula M-18-1, compounds of formula M-18-3, compounds of formula M-26-1, compounds of formula M-26-2, compounds of formula M-26-3, compounds of formula M-34-2, compounds of formula M-44-1, compounds of formula M-46-1, and compounds of formula M-47-1. The mass percentage of the compound of formula M in the group consisting of the compounds is 30%-80% (including any values ​​and subranges between the ranges), for example, 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, 50%, 52%, 54%, 56%, 58%, 60%, 62%, 64%, 66%, 68%, 70%, 72%, 74%, 76%, 78%, 80%, or the range between any two values.

[0108] In some embodiments of the present application, the liquid crystal composition further comprises at least one type A compound, wherein the type A compound is selected from the group consisting of a compound of formula A-1 and a compound of formula A-2:

[0109] as well as

[0110] Among them, R A1 、R A2 Each independently represents -H, a straight or branched chain alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms, One or more non-adjacent -CH2- in the straight or branched alkyl group containing 1 to 12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-; one or more -H in the aforementioned group may be independently replaced by -F or -Cl;

[0111] ring ring ring and Ring Each independently expresses described One or more -CH2- in the can be replaced by -O-; One or more single bonds in the ring may be replaced by double bonds; -CH= in one or more rings may be replaced by -N=; one or more -H in the aforementioned groups may be independently replaced by -F, -Cl or -CN;

[0112] 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-;

[0113] L A11 、L A12 、L A13 、L A21 and L A22 each independently represents -H, halogen, or an unsubstituted or halogenated straight-chain alkyl group containing 1 to 3 (e.g., 1, 2, or 3) carbon atoms;

[0114] X A1 and X A2 each independently represents halogen, 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;

[0115] n A11 Indicates 0, 1, 2, or 3; when n A11 =2 or 3, the ring Can be the same or different, Z A11 Can be the same or different;

[0116] n A12 is 1 or 2; when n A12 =2, the ring Can be the same or different;

[0117] n A2 Indicates 0, 1, 2, or 3; when n A2 =2 or 3, the ring Can be the same or different, Z A21 Can be the same or different.

[0118] In some embodiments of the present application, the compound of formula A-1 is selected from the group consisting of the following compounds:

[0119] as well as

[0120] Among them, R A1 Having the same defined range as in the general formula A-1;

[0121] L A11 , L A12 , L A14 , L A15 and L A16 Each independently represents -H or -F;

[0122] L A13 Indicates -H or -CH3;

[0123] X A1 Indicates -F, -CF3 or -OCF3.

[0124] In some embodiments of the present application, the compound of formula A-2 is selected from the group consisting of the following compounds:

[0125] as well as

[0126] Among them, R A2 Having the same defined range as in the general formula N-2;

[0127] L A21 , L A22 , L A23 , L A24 and L A25 Each independently represents -H or -F;

[0128] X A2 It represents -F, -CF3, -OCF3 or -CH2CH2CH=CF2.

[0129] In some embodiments of the present application, on the basis of maintaining a higher clearing point, appropriate optical anisotropy and appropriate dielectric anisotropy, in order to obtain a larger elastic constant, a higher contrast and a better Flicker flicker value, the Class A compound contains at least one (for example, two, three, four or five) Class A compounds selected from the group consisting of compounds of the general formula A-1 and compounds of the general formula A-2.

[0130] In some embodiments of the present application, on the basis of maintaining a higher clearing point, appropriate optical anisotropy and appropriate dielectric anisotropy, in order to obtain a larger elastic constant, a higher contrast and a better Flicker flicker value, the Class A compound contains at least one (for example, two, three, four or five) Class A compounds selected from the group consisting of compounds of the general formula A-1-5, compounds of the general formula A-1-10, compounds of the general formula A-1-12, compounds of the general formula A-2-5, compounds of the general formula A-2-6, compounds of the general formula A-2-14 and compounds of the general formula A-2-15.

[0131] In some embodiments of the present application, in order to obtain a larger elastic constant, higher contrast, and better Flicker flicker value while maintaining a relatively high clearing point, appropriate optical anisotropy, and appropriate dielectric anisotropy, the compound of general formula A-1 comprises at least one (e.g., two, three, four, or five) compounds of general formula A-1 selected from the group consisting of the following compounds:

[0132] as well as

[0133] 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 or a branched-chain alkyl group containing 3 to 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms;

[0134] X A1 Indicates -F, -CF3 or -OCF3.

[0135] In some embodiments of the present application, R A1 It represents a straight-chain alkyl group containing 1 to 5 carbon atoms.

[0136] In some embodiments of the present application, in order to obtain a larger elastic constant, higher contrast, and better Flicker flicker value while maintaining a relatively high clearing point, appropriate optical anisotropy, and appropriate dielectric anisotropy, the compound of general formula A-2 comprises at least one (e.g., two, three, four, or five) compounds of general formula A-2 selected from the group consisting of the following compounds:

[0137] as well as

[0138] Among them, R A2represents 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;

[0139] X A2 It represents -F, -CF3, -OCF3 or -CH2CH2CH=CF2.

[0140] In some embodiments of the present application, R A2 It represents a straight-chain alkyl group containing 1 to 5 carbon atoms.

[0141] In some embodiments of the present application, on the basis of maintaining a higher clearing point, appropriate optical anisotropy and appropriate dielectric anisotropy, in order to obtain a larger elastic constant, higher contrast and better Flicker flicker value, the Class A compound contains at least one (for example, two, three, four or five) Class A compounds selected from the group consisting of compounds of the general formula A-1-5-1, compounds of the general formula A-1-10-1, compounds of the general formula A-1-12-1, compounds of the general formula A-2-5-1, compounds of the general formula A-2-6-1, compounds of the general formula A-2-14-1, compounds of the general formula A-2-14-2, compounds of the general formula A-2-15-1 and compounds of the general formula A-2-15-2.

[0142] In some embodiments of the present application, the mass percentage of the type A compound in the liquid crystal composition is 0.1%-60% (including any numerical value or sub-range between this range), for example, 0.1%, 1%, 2%, 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%, 60%, or a range between any two of the numerical values.

[0143] Preferably, the mass percentage of the type A compound in the liquid crystal composition is 0.1%-30%.

[0144] In some embodiments of the present application, the mass percentage of at least one Class A compound selected from the group consisting of compounds of general formula A-1 and compounds of general formula A-2 is 0.1%-40% (including any numerical value or sub-range between this range), for example, 0.1%, 1%, 2%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, or a range between any two of the numerical values.

[0145] In some embodiments of the present application, the mass percentage of at least one Class A compound selected from the group consisting of compounds of general formula A-1-5, compounds of general formula A-1-10, compounds of general formula A-1-12, compounds of general formula A-2-5, compounds of general formula A-2-6, compounds of general formula A-2-14 and compounds of general formula A-2-15 is 0.1%-30% (including any numerical value or sub-range between this range), for example, 0.1%, 1%, 2%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, or a range between any two of the numerical values.

[0146] In some embodiments of the present application, the mass percentage of at least one Class A compound selected from the group consisting of compounds of general formula A-1-5-1, compounds of general formula A-1-10-1, compounds of general formula A-1-12-1, compounds of general formula A-2-5-1, compounds of general formula A-2-6-1, compounds of general formula A-2-14-1, compounds of general formula A-2-14-2, compounds of general formula A-2-15-1 and compounds of general formula A-2-15-2 is 1%-30% (including any numerical value or sub-range between this range), for example, 1%, 2%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, or a range between any two of the numerical values.

[0147] In addition to the above compounds, the liquid crystal composition of the present application may also include any one or a combination of at least two of common nematic liquid crystals, smectic liquid crystals, cholesteric liquid crystals, polymerizable monomers or additives.

[0148] In a preferred embodiment, the liquid crystal composition further comprises at least one additive.

[0149] In some embodiments of the present application, the mass percentage of the additive in the liquid crystal composition is 0.01-5%; preferably, the mass weight percentage of the additive in the liquid crystal composition is 0.01%-1%.

[0150] In a preferred embodiment, the additive includes any one or a combination of at least two of a dopant, an antioxidant, an ultraviolet absorber, an infrared absorber or a light stabilizer.

[0151] Possible dopants that are preferably added to the liquid crystal composition of the present application are shown below:

[0152] as well as

[0153] Wherein, “*” indicates a chiral site.

[0154] In addition, the antioxidants, light stabilizers and other additives used in the liquid crystal composition of the present application are preferably the following:

[0155] Here, n represents an integer from 1 to 12.

[0156] In a second aspect, the present application provides a liquid crystal display device, comprising the liquid crystal composition as described in the first aspect.

[0157] In a third aspect, the present application provides an application of the aforementioned liquid crystal composition in a liquid crystal display device, wherein the aforementioned liquid crystal composition is particularly suitable for a high-contrast, fast-response IPS liquid crystal display mode.

[0158] Compared with the related art, this application has the following beneficial effects:

[0159] The liquid crystal composition provided in the present application has a large elastic constant, a high contrast ratio and a good Flicker value on the basis of maintaining a high clearing point, appropriate optical anisotropy and appropriate dielectric anisotropy, which helps to improve the display effect of the liquid crystal material, so that the liquid crystal display device containing it has a small threshold voltage and a wide temperature operating range, and can be widely used in high-contrast and fast-response IPS liquid crystal display mode.

[0160] Still other aspects will become apparent upon reading and understanding the detailed description. DETAILED DESCRIPTION

[0161] To facilitate understanding of the present application, the present application lists the following examples. Those skilled in the art should understand that the examples are only provided to help understand the present application and should not be considered as specific limitations of the present application.

[0162] For ease of expression, in the following examples and comparative examples, the group structures of the compounds are represented by the codes listed in Table 1:

[0163] Table 1

[0164] Take the following compound as an example: 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 carbon atoms in the left-hand alkyl group. For example, if n is "3", it means that the alkyl group is -C3H7; C in the code represents 1,4-cyclohexylene, G represents 2-fluoro-1,4-phenylene, and F represents fluorine.

[0165] The abbreviations of the test items in the following examples and comparative examples are as follows: Cp clearing point (nematic-isotropic phase transition temperature, °C) Δn optical anisotropy (589 nm, 25 °C) n o The refractive index of ordinary light n e Refractive index of extraordinary light Δε Dielectric anisotropy (1KHz, 25℃) K ave Average elastic constant (20℃) K 11 Splay elastic constant (25℃) K 22 Torsional elastic constant (25℃) K 33 Bending spring constant (25℃) CR Contrast ratio (25℃) Flicker value (dB)

[0166] (1) Cp: obtained by melting point test;

[0167] (2) Δn: Δn = n e -n0, measured using an Abbe refractometer under a sodium lamp (589 nm) at 25°C;

[0168] (3) Δε: Δε=ε ∥ -ε ⊥ , where ε ∥ is the dielectric constant parallel to the molecular axis, ε ⊥ is the dielectric constant perpendicular to the molecular axis; test conditions: 25°C, 1 kHz, TN type test cell with a cell thickness of 7 μm;

[0169] (4) Flicker value: The test was performed using a DMS 505 tester in Flicker mode, and the logarithm of the test value was obtained; the test conditions were: 25°C, 40 Hz, V22 voltage drive, and a FFS test cell with a cell thickness of 3 μm;

[0170] (5)K ave :K ave =(K 11 +K 22 +K 33 ), where K11 , K 22 and K 33 The capacitance-voltage characteristic curve (CV curve) of the liquid crystal material is measured and calculated using an LCR meter and an anti-parallel friction cell. The test conditions are: anti-parallel friction cell with a cell thickness of 7 μm, V = 0.1 to 20 V.

[0171] (6) 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 , CR by T r255 / T r0 The test conditions were: 25°C, a positive FFS test box with a thickness of 3 μm;

[0172] The compounds used in the following examples can be synthesized by known methods or obtained through commercial channels. These synthesis techniques are conventional, and the resulting liquid crystal compositions have been tested to meet the standards of electronic compounds.

[0173] Liquid crystal compositions were prepared according to the proportions of the liquid crystal compositions in the following examples and comparative examples. The liquid crystal compositions were prepared according to conventional methods in the art, such as mixing in a prescribed proportion by heating, ultrasonication, suspension, etc.

[0174] Example 1

[0175] A liquid crystal composition comprising the components in the percentages by mass shown in the following table was filled between two substrates of a liquid crystal display for performance testing:

[0176] Example 2

[0177] A liquid crystal composition comprising the components in the percentages by mass shown in the following table was filled between two substrates of a liquid crystal display for performance testing:

[0178] Comparative Example 1

[0179] A liquid crystal composition comprising the components in the percentages by mass shown in the following table was filled between two substrates of a liquid crystal display for performance testing:

[0180] According to the comparison between Example 2 and Comparative Example 1, the preferred structure and content of the compound of general formula I and the type N compound in the present application enable the liquid crystal composition of the present application to have a larger elastic constant (K ) while maintaining a higher clearing point (81.2 vs. 81.2), appropriate optical anisotropy (0.115 vs. 0.114) and appropriate dielectric anisotropy (8.4 vs. 7.9). ave : 13.1 VS 12.3), higher contrast (1500 VS 1320) and better Flicker value (-43.56 VS -38.56).

[0181] Example 3

[0182] A liquid crystal composition comprising the components in the percentages by mass shown in the following table was filled between two substrates of a liquid crystal display for performance testing:

[0183] Example 4

[0184] A liquid crystal composition comprising the components in the percentages by mass shown in the following table was filled between two substrates of a liquid crystal display for performance testing:

[0185] Example 5

[0186] A liquid crystal composition comprising the components in the percentages by mass shown in the following table was filled between two substrates of a liquid crystal display for performance testing:

[0187] Example 6

[0188] A liquid crystal composition comprising the components in the percentages by mass shown in the following table was filled between two substrates of a liquid crystal display for performance testing:

[0189] Example 7

[0190] A liquid crystal composition comprising the components in the percentages by mass shown in the following table was filled between two substrates of a liquid crystal display for performance testing:

[0191] Example 8

[0192] A liquid crystal composition comprising the components in the percentages by mass shown in the following table was filled between two substrates of a liquid crystal display for performance testing:

[0193] From the comparison of the embodiments of the present application and the comparative examples, it can be seen that the present application compounded the compound containing the cyclohexene structure (the compound of the general formula I) and the N-type compound, so that the liquid crystal composition has a larger elastic constant (13.1-17.2), a higher contrast (1500-2150) and a better Flicker value (-43.56--53.51) while maintaining a higher clearing point (81.2-105.5), an appropriate optical anisotropy (0.0976-0.115) and an appropriate dielectric anisotropy (2.7-8.4), which helps to improve the display effect of the liquid crystal material, so that the liquid crystal display device containing it has a lower threshold voltage and a wider temperature range, and can be widely used in high-contrast and fast-response IPS liquid crystal display mode.

[0194] The applicant declares that while the above-mentioned embodiments are used to illustrate the detailed process equipment and process flow of the present application, the present application is not limited to the above-mentioned detailed process equipment and process flow, which does not mean that the present application must rely on the above-mentioned detailed process equipment and process flow in order to be implemented. Those skilled in the art should understand that any improvements to the present application, equivalent replacements for the raw materials of the present application's products, addition of auxiliary ingredients, and selection of specific methods, etc., fall within the scope of protection and disclosure of the present application.

Claims

1. A liquid crystal composition, comprising: At least one compound of general formula I: And At least one type of N compound, said N compound being selected from the group consisting of compounds of general formula N-1 and compounds of general formula N-2: wherein, R X1 and R X2 each independently represents a straight-chain or branched-chain alkyl group having 1 to 12 carbon atoms, One or more non-adjacent -CH2- in the straight-chain or branched-chain alkyl group having 1 to 12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO- respectively; Ring Sum ring Each independently represents and ring Ring at least one of which represents R N1 and R N2 each independently represents -H, a straight-chain or branched alkyl group having 1 to 12 carbon atoms, One or more non-adjacent -CH2- in the straight-chain or branched-chain alkyl group having 1 to 12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO- respectively; one or more -H in the foregoing groups may be independently replaced by -F or -Cl; Ring Ring Ring Sum ring Each independently represents The said One or more of the -CH2- in it can be replaced by -O-, and one or more of the single bonds in the ring can be replaced by double bonds; the -CH= in one or more of the rings may be replaced by -N=; one or more -H in the foregoing groups may be independently replaced by -F, -Cl or -CN; wherein, the compound of general formula N-1 comprises at least one The compound of general formula N-2 comprises at least one Z N11 , Z N21 and Z N22 each independently represents a single bond, -CH2CH2-, -CF2CF2-, -CO-O-, -O-CO-, -O-CO-O-, -CH=CH-, -CF=CF-, -CH2O- or -OCH2-; L N11 、L N12 、L N13 、L N21 and L N22 each independently represents -H, a halogen, or an unsubstituted or halogenated straight-chain alkyl group having 1 to 3 carbon atoms; X N1 and X N2 each independently represents a halogen, a haloalkyl having 1 to 5 carbon atoms, a haloalkoxy having 1 to 5 carbon atoms, a haloalkenyl having 2 to 5 carbon atoms or a haloalkenyloxy having 2 to 5 carbon atoms; n N11 represents 0, 1, 2 or 3; when n N11 = 2 or 3, the ring may be the same or different, Z N11 may be the same or different; n N12 is 1 or 2; n N12 When = 2, the ring May be the same or different; n N2 represents 0, 1, 2 or 3; when n N2 = 2 or 3, the ring may be the same or different, Z N21 may be the same or different.

2. The liquid crystal composition according to claim 1, wherein The compound of general formula I is selected from the group consisting of the following compounds: and Among them, R X1 and R X2 have the same defined ranges as those in the general formula I.

3. The liquid crystal composition according to claim 1, wherein The compound of general formula N-1 is selected from the group consisting of the following compounds: and wherein, R N1 has the same defined scope as in the general formula N-1; L N11 、L N12 、L N11 '、L N12 '、L N14 、L N15 and L N16 each independently represents -H or -F; L N13 and L N13 each independently represents -H or -CH3; X N1 each independently represents -F, -CF3 or -OCF3; R v and R w each independently represents -CH2- or -O-; and v and w each independently represent 0 or 1.

4. The liquid crystal composition according to claim 1, wherein The compound of general formula N-2 is selected from the group consisting of the following compounds: and wherein, R N2 has the same defined range as in the general formula N-2; L N21 、L N22 、L N23 、L N24 and L N25 each independently represents -H or -F; X N2 represents -F, -CF3 or -OCF3.

5. The liquid crystal composition according to claim 1, wherein The mass percentage content of the compound of general formula I in the liquid crystal composition is 0.1% - 40%; the mass percentage content of the N-type compound in the liquid crystal composition is 0.1% - 40%.

6. The liquid crystal composition according to claim 1, wherein The liquid crystal composition further comprises at least one compound of general formula M: wherein, R M1 and R M2 each independently represents a straight-chain or branched-chain alkyl group having 1 to 12 carbon atoms, One or more non-adjacent -CH2- in the straight-chain or branched-chain alkyl group having 1 to 12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO- respectively; Ring Ring Sum ring Each independently represents The One or more of the -CH2- therein may be replaced by -O-, and one or at most two single bonds in the rings may be replaced by double bonds; the At most one -H may be substituted by a halogen; Z M1 and Z M2 each independently represents a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CF2CF2-, -CF2O-, -OCF2-, -CH2CH2- or -(CH2)4-; n M represents 0, 1, 2, or 3; when n M = 2 or 3, the ring identical or different, Z M2 identical or different; when n M = 0, the ring Sum ring Not Preferably, the mass percentage content of the compound of general formula M in the liquid crystal composition is 0.1% - 90%.

7. The liquid crystal composition according to claim 1, wherein The liquid crystal composition further comprises at least one type A compound, and the type A compound is selected from the group consisting of a compound of general formula A-1 and a compound of general formula A-2: and wherein, R A1 , R A2 each independently represents -H, a straight-chain or branched alkyl group having 1 to 12 carbon atoms, One or more non-adjacent -CH2- in the straight-chain or branched-chain alkyl group having 1 to 12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO- respectively; one or more -H in the foregoing groups may be independently replaced by -F or -Cl; Ring Ring Ring Sum ring Each independently represents The One or more of the -CH2- in it may be replaced by -O-; the one or more single bonds in the ring(s) may be replaced by double bonds; said -CH= in one or more of the rings may be replaced by -N=; one or more -H in the foregoing groups may be independently replaced by -F, -Cl or -CN; 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-; L A11 、L A12 、L A13 、L A21 and L A22 each independently represents -H, a halogen, or an unsubstituted or halogenated straight-chain alkyl group having 1 to 3 carbon atoms; X A1 and X A2 each independently represents a halogen, a haloalkyl group having 1 to 5 carbon atoms, a haloalkoxy group having 1 to 5 carbon atoms, a haloalkenyl group having 2 to 5 carbon atoms or a haloalkenyloxy group having 2 to 5 carbon atoms; n A11 represents 0, 1, 2, or 3; when n A11 = 2 or 3, the ring may be the same or different, Z A11 may be the same or different; n A12 is 1 or 2; when n A12 = 2, the ring May be the same or different; n A2 represents 0, 1, 2, or 3; when n A2 = 2 or 3, the ring may be the same or different, Z A21 may be the same or different; Preferably, the mass percentage content of the A-type compound in the liquid crystal composition is 0.1% - 60%.

8. The liquid crystal composition according to claim 7, wherein The compound of general formula A-1 is selected from the group consisting of the following compounds: and wherein, R A1 has the same defined range as in the general formula A-1; L A11 、L A12 、L A14 、L A15 and L A16 each independently represents -H or -F; L A13 represents -H or -CH3; X A1 represents -F, -CF3 or -OCF3; Preferably, the compound of general formula A-2 is selected from the group consisting of the following compounds: and wherein, R A2 has the same defined range as in the general formula N-2; L A21 、L A22 、L A23 、L A24 and L A25 each independently represents -H or -F; X A2 represents -F, -CF3, -OCF3 or -CH2CH2CH=CF2.

9. A liquid crystal display device, comprising the liquid crystal composition according to any one of claims 1 - 8.

10. An application of a liquid crystal display device as described in claim 9, wherein, Use of the liquid crystal display device in an IPS liquid crystal display mode.

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