Liquid crystal composition, liquid crystal display device comprising same, and use thereof

Abstract

The present invention provides a liquid crystal composition, a liquid crystal display device comprising same, and the use thereof. The liquid crystal composition of the present invention comprises at least one compound of general formula I and at least one compound of general formula II. In the liquid crystal composition of the present invention, on the basis of maintaining an appropriate dielectric anisotropy, a relatively good optical anisotropy, and a relatively good clearing point, by means of the mutual compounding of the specific structures and contents of compounds, the composition has a relatively large elastic constant, a relatively high transmittance, a relatively low rotational viscosity, and a relatively good Flicker value, has the performance advantages of a compound containing a cyclohexene structure, and can also compensate for defects such as low-temperature storage stability, and has good low-temperature storage stability, such that the liquid crystal display device comprising the liquid crystal composition has a relatively high response speed, a relatively large contrast ratio and a relatively wide temperature usage range. The liquid crystal display device is used in a high-contrast and fast-response NFFS liquid crystal display mode.

Description

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

[0001] The present invention belongs to the technical field of liquid crystal materials, and in particular 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, finding widespread application, particularly in portable electronic information products. As the size of LCD screens used in portable computers, office applications, and video applications increased, LCDs became suitable for larger screens and eventually replaced cathode ray tube (CRT) displays.

[0003] Liquid crystal material is a mixture of organic rod-shaped small molecular compounds that have both liquid fluidity and crystal anisotropy at a certain temperature. Liquid crystal display devices operate by utilizing the optical anisotropy and dielectric anisotropy of the liquid crystal material itself.

[0004] Compared to traditional display devices and materials, liquid crystal display materials offer significant advantages: low driving voltage, minimal power consumption, high reliability, large amounts of displayed information, color display, flicker-free display, no harmful effects on the human body, automated production processes, low cost, the ability to manufacture LCDs of various specifications 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 numerous display applications.

[0005] Compounds containing cyclohexene structures are a relatively new type of liquid crystal monomer material in recent years. They have performance advantages such as fast response speed and large K value. This type of liquid crystal monomer material has some typical applications in negative liquid crystal materials. However, compounds containing cyclohexene structures also have some disadvantages in application, namely, their usage is limited, and an excessive proportion can easily lead to a decrease in mutual solubility, affecting performance such as low-temperature storage stability.

[0006] In LCD applications, contrast is crucial to visual quality. Generally speaking, a higher contrast ratio results in a sharper, more eye-catching image and more vibrant colors. Conversely, a lower contrast ratio results in a grayish, hazy image. High contrast significantly enhances image clarity, detail, and grayscale gradation. High-contrast products offer advantages in black-white contrast, clarity, and integrity. Contrast also significantly impacts the display quality of dynamic video. Because dynamic images experience rapid transitions between light and dark, higher contrast makes it easier for the human eye to discern these transitions.

[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] To improve the response speed of liquid crystal display devices, it is necessary to minimize the rotational viscosity of the liquid crystal material. However, low-viscosity liquid crystal materials generally have lower clearing points and optical anisotropy. Therefore, when formulating liquid crystal compositions, it is necessary to consider other performance requirements while reducing viscosity.

[0009] Adjusting the formulation of a liquid crystal composition involves simultaneously adjusting numerous performance parameters of the composition. Adjusting one performance parameter of a liquid crystal composition without affecting another is nearly impossible. Sometimes, adjusting one performance parameter of a liquid crystal composition by adding a certain monomeric liquid crystal may benefit one or more other properties, but may also negatively impact the improvement of yet other properties. Therefore, obtaining liquid crystal compositions that fully or partially address these issues remains an urgent challenge in the art.

[0010] Summary of the Invention

[0011] In view of the deficiencies in the prior art, the object of the present invention is to provide a liquid crystal composition, a liquid crystal display device comprising the same, and applications thereof. Compared with the prior art, the liquid crystal composition provided by the present invention has a larger elastic constant, a higher transmittance, a smaller rotational viscosity, and a better Flicker flicker value on the basis of maintaining appropriate dielectric anisotropy, good optical anisotropy, and a good clearing point. While taking into account the performance advantages of compounds containing cyclohexene structures, it can also make up for the defects in low-temperature storage stability and other aspects, and has good low-temperature storage stability, so that the liquid crystal display device comprising the same has a faster response speed, a larger contrast, and a wider temperature range of use, which helps to improve low-frequency display and enhance the display effect of liquid crystal materials, and is suitable for application in high-contrast, fast-response NFFS liquid crystal display mode.

[0012] Technical Solution

[0013] To achieve this object, the present invention adopts the following technical solutions:

[0014] In a first aspect, the present invention provides a liquid crystal composition comprising:

[0015] At least one compound of the general formula I:

[0016] as well as

[0017] At least one compound of formula II:

[0018] in,

[0019] R A1 and R A2 Each independently represents a straight-chain alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, a branched-chain alkyl group containing 3 to 12 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, wherein one or more non-adjacent -CH2- in the linear alkyl group containing 1-12 carbon atoms or the branched alkyl group containing 3-12 carbon atoms can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-;

[0020] R B1 and R B2 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 more non-adjacent -CH2- in the linear alkyl group containing 1-12 carbon atoms or the branched alkyl group containing 3-12 carbon atoms can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-;

[0021] ring and Ring Each independently expresses At least one ring or ring for

[0022] ring and Ring Each independently expresses wherein One or more -H in the ring may be replaced by -F, -Cl, or -CN, and one or more -CH= in the ring may be replaced by -N=. One or more -CH2- in the compound may be replaced by -O-, and the compound of formula II contains at least one ring

[0023] Z B1 and Z B2 Each independently represents a single bond, -CO-O-, -O-CO-, -O-CO-O-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, -CF2CF2-, -CF=CF-, -(CH2)4-, -CF2O- or -OCF2-;

[0024] n B1 Indicates 1, 2, or 3, n B2 Represents 0 or 1, where n B1 When it means 2 or 3, the ring Same or different, Z B1 the same or different; and,

[0025] L B1 and L B2 Each independently represents -H, halogen, an alkyl group containing 1 to 3 (e.g., 1, 2, or 3) carbon atoms, or an alkoxy group containing 1 to 3 (e.g., 1, 2, or 3) carbon atoms.

[0026] In some embodiments of the present invention, R A1 and R A2Each 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.

[0027] In some embodiments of the present invention, R B1 and R B2 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, or a branched-chain alkenyl group containing 3 to 8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms.

[0028] In some embodiments of the present invention, Z B1 and Z B2 Each independently represents a single bond, -CO-O-, -CH2O-, -OCH2-, -CH=CH-, -CH2CH2- or -(CH2)4-.

[0029] In some embodiments of the present invention, L B1 and L B2 Each independently represents -H.

[0030] The alkenyl group of the present invention is preferably a group represented by any one of formulas (V1) to (V9), and is particularly preferably represented by formula (V1), formula (V2), formula (V8), or (V9). The groups represented by formulas (V1) to (V9) are as follows: in," X ” indicates the carbon atom in the ring structure to which it is bonded.

[0031] In the present invention, when n B1 =2, there are two rings in the compound These two rings They may have the same structure or different structures. For example, one may be Another one is When the expression "same or different" is used in the present invention, it has the same meaning.

[0032] In some embodiments of the present invention, the compound of formula I is selected from the group consisting of:

[0033] as well as

[0034] In some embodiments of the present invention, in order to obtain a larger elastic constant, a higher permeability, a smaller rotational viscosity, a better Flicker flicker value, a better low-temperature storage stability and a better low-temperature miscibility, the compound of general formula I contains at least one (for example, two, three, four or five) compounds selected from the group consisting of compounds of general formula I-1 and compounds of general formula I-3.

[0035] In some embodiments of the present invention, in order to obtain a larger elastic constant, a higher permeability, a smaller rotational viscosity, a better Flicker flicker value, better low-temperature storage stability, and better low-temperature miscibility, the compound of general formula I preferably contains at least one (e.g., two, three, four, or five) compounds selected from the group consisting of the following compounds:

[0036]

[0037] as well as

[0038]

[0039] in,

[0040] R A1 and R A2 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;

[0041] R A11 and R A21 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;

[0042] R A12 and R A22Each 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.

[0043] In some embodiments of the present invention, the content of the compound of general formula I is preferably adjusted so that the liquid crystal composition containing it has a larger elastic constant, higher transmittance, smaller rotational viscosity, better Flicker flicker value, better low-temperature storage stability and better low-temperature miscibility.

[0044] In some embodiments of the present invention, the weight percentage of the compound of formula I in the liquid crystal composition is 0.1%-50% (including any value or sub-range between the ranges), for example, 0.1%, 0.3%, 0.5%, 0.7%, 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%, 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%, or a range between any two of these values. Preferably, the weight percentage of the compound of formula I in the liquid crystal composition is 0.1%-30%.

[0045] In some embodiments of the present invention, the liquid crystal composition contains at least one (e.g., two, three, four, or five) compound selected from the group consisting of compounds of formula I-1 and compounds of formula I-3, which account for 0.1%-30% (including any value or sub-range between this range) of the liquid crystal composition, for example, 0.1%, 0.3%, 0.5%, 0.7%, 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%, 26%, 27%, 28%, 29%, 30%, or a range between any two values.

[0046] In some embodiments of the present invention, the liquid crystal composition contains at least one (for example, two, three, four or five) compound 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-1-3, compounds of general formula I-1-4 and compounds of general formula I-1-5, and the weight percentage of the liquid crystal composition is 1%-20% (including any 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%, or a range between any two of the values.

[0047] In some embodiments of the present invention, the compound of formula II is selected from the group consisting of:

[0048]

[0049] as well as

[0050] as well as

[0051]

[0052] in,

[0053] Z B11 and Z B12 Each independently represents a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -CH2CH2- or -(CH2)4-.

[0054] In some embodiments of the present invention, in order to obtain a larger elastic constant, a higher permeability, a smaller rotational viscosity, a better Flicker flicker value, better low-temperature storage stability, and better low-temperature miscibility, the compound of formula II preferably comprises at least one (e.g., two, three, four, or five) compound selected from the group consisting of the following compounds:

[0055] in,

[0056] R B11 and R B2represents 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, or a branched-chain alkoxy group containing 3 to 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms;

[0057] R B12 It 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.

[0058] In some embodiments of the present invention, the content of the compound of general formula II is preferably adjusted so that the liquid crystal composition containing it has a larger elastic constant, higher transmittance, smaller rotational viscosity, better Flicker flicker value, better low-temperature storage stability and better low-temperature miscibility.

[0059] In some embodiments of the present invention, the weight percentage of the compound of formula II in the liquid crystal composition is 0.1%-60% (including any value or sub-range between the ranges), for example, 0.1%, 0.3%, 0.5%, 0.7%, 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%, 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%, or a range between any two of these values. Preferably, the weight percentage of the compound of formula II in the liquid crystal composition is 0.1%-45%.

[0060] In some embodiments of the present invention, in order to obtain a larger elastic constant, a higher transmittance, a smaller rotational viscosity, a better Flicker flicker value, a better low-temperature storage stability and a better low-temperature miscibility, the liquid crystal composition comprises at least one (e.g., two, three, four or five) compound selected from the group consisting of compounds of formula II-1, compounds of formula II-3, compounds of formula II-4, compounds of formula II-6, compounds of formula II-8 and compounds of formula II-10, which account for 0.1% to 40% by weight of the liquid crystal composition (including %, 34%, 35%, 36%, 37%, 38%, 39%, 40%, or a range between any two values ​​therein.

[0061] In some embodiments of the present invention, the liquid crystal composition comprises at least one (e.g., two, three, four, or five) compound selected from the group consisting of compounds of formula II-1-1-2, compounds of formula II-1-2-1, compounds of formula II-3-1-1, compounds of formula II-4-1-1, compounds of formula II-6-1-1, compounds of formula II-8-1-1, compounds of formula II-10-1-1, compounds of formula II-10-2-1, and compounds of formula II-10-2-2, which accounts for 10% by weight of the liquid crystal composition. The amount percentage is 1%-40% (including any value or sub-range therebetween), 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%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, or a range between any two values.

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

[0063] in,

[0064] R M1 and R M2Each 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 more non-adjacent -CH2- in the linear alkyl group containing 1-12 carbon atoms or the branched alkyl group containing 3-12 carbon atoms can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-;

[0065] ring ring and Ring Each independently expresses in One or more -CH2- in the ring may be replaced by -O-, and one or at most two single bonds in the ring may be replaced by double bonds, At most one -H in may be replaced by halogen;

[0066] Z M1 and Z M2 Each independently represents a single bond, -CH2CH2-, -C≡C-, -CH=CH-, -(CH2)3-, -(CH2)4-, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CF2CF2-, -CF2O- or -OCF2-; and,

[0067] n M represents 0, 1 or 2, where n M When it indicates 0, the ring and Ring Not for When n M When it means 2, the ring Can be the same or different, Z M2 Can be the same or different.

[0068] In some embodiments of the present invention, preferably, R M1 and R M2and 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 8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms,

[0069] In some embodiments of the present invention, preferably, 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 alkenyl group containing 3 to 8 carbon atoms, or a branched 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 alkyl group containing 3 to 8 carbon atoms.

[0070] In some embodiments of the present invention, the compound of formula M is selected from the group consisting of:

[0071] In some embodiments of the present invention, in order to obtain a larger elastic constant, a higher permeability, a smaller rotational viscosity, a better Flicker flicker value, a better low-temperature storage stability and a better low-temperature miscibility, the compound of general formula M contains at least one (for example, two, three, four or five) compound selected from the group consisting of compounds of general formula M-1, compounds of general formula M-12, compounds of general formula M-13, compounds of general formula M-16, compounds of general formula M-17 and compounds of general formula M-18.

[0072] In some embodiments of the present invention, in order to obtain a larger elastic constant, a higher permeability, a smaller rotational viscosity, a better Flicker flicker value, a better low-temperature storage stability and a better low-temperature miscibility, preferably, the compound of the general formula M comprises at least one (e.g., two, three, four or five) compounds selected from the group consisting of the following compounds:

[0073]

[0074] as well as

[0075]

[0076] in,

[0077] 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;

[0078] 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;

[0079] R M22 It 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.

[0080] In some embodiments of the present invention, it is preferred to adjust the content of the compound of general formula M so that the liquid crystal composition containing it has a larger elastic constant, higher transmittance, smaller rotational viscosity, better Flicker flicker value, better low-temperature storage stability and better low-temperature miscibility.

[0081] In some embodiments of the present invention, the weight percentage of the compound of general formula M in the liquid crystal composition is 0.1%-60% (including any numerical value or sub-range between this range), for example, 0.1%, 1%, 3%, 5%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 17%, 18%, 20%, 22%, 23%, 24%, 25%, 27%, 28%, 30%, 31%, 32%, 33%, 35%, 37%, 38%, 40%, 42%, 44%, 45%, 46%, 48%, 50%, 52%, 55%, 56%, 58%, 60%, or a range between any two values ​​therein. Preferably, the weight percentage of the compound of general formula M in the liquid crystal composition is 0.1%-45%.

[0082] In some embodiments of the present invention, the liquid crystal composition contains at least one (for example, two, three, four or five) compound selected from the group consisting of compounds of the general formula M-1, compounds of the general formula M-12, compounds of the general formula M-13, compounds of the general formula M-16, compounds of the general formula M-17 and compounds of the general formula M-18, and the weight percentage of the compound in the liquid crystal composition is 0.1%-45% (including any numerical value or sub-range between the range), for example, 0.1%, 0.5%, 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%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, or a range between any two of the values.

[0083] In some embodiments of the present invention, the liquid crystal composition comprises at least one (e.g., two, three, four, or five) compound selected from the group consisting of a compound of formula M-1-3, a compound of formula M-12-1, a compound of formula M-12-3, a compound of formula M-13-1, a compound of formula M-13-2, a compound of formula M-16-3, a compound of formula M-17-2, and a compound of formula M-18-3, which accounts for 1% to 45% by weight of the liquid crystal composition (including any value or sub-range between the ranges). ), 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%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, or a range between any two values.

[0084] In some embodiments of the present invention, the liquid crystal composition of the present invention further comprises at least one compound of the general formula N:

[0085] in,

[0086] R N1 and R N2Each 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 more non-adjacent -CH2- in the linear alkyl group containing 1-12 carbon atoms or the branched alkyl group containing 3-12 carbon atoms can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-;

[0087] ring and Ring Each independently expresses wherein One or more -CH2- in the group may be replaced by -O-, wherein the One or more -H in the ring may be replaced by -F, -Cl, or -CN, and one or more -CH= in the ring may be replaced by -N=;

[0088] 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-;

[0089] L N1 and L N2 each independently represents -H, halogen, an alkyl group containing 1 to 3 (e.g., 1, 2, or 3) carbon atoms, or an alkoxy group containing 1 to 3 (e.g., 1, 2, or 3) carbon atoms; and

[0090] n N1 Indicates 0, 1, 2, or 3, n N2 Represents 0 or 1, and 0≤n N1 +n N2 ≤3; when n N1 When it means 2 or 3, the ring Same or different, Z N1 Same or different.

[0091] In some embodiments of the present invention, preferably, 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.

[0092] In some embodiments of the present invention, preferably, Z N1 and Z N2 Each independently represents a single bond, -CO-O-, -CH2O-, -CH=CH-, -C≡C-, or -CH2CH2-.

[0093] In some embodiments of the present invention, preferably, L N1 and L N2 All represent -H.

[0094] In some embodiments of the present invention, the compound of formula N is selected from the group consisting of:

[0095] In some embodiments of the present invention, in order to obtain a larger elastic constant, a higher permeability, a smaller rotational viscosity, a better Flicker flicker value, a better low-temperature storage stability and a better low-temperature miscibility, the compound of general formula N contains at least one (for example, two, three, four or five) compound selected from the group consisting of compounds of general formula N-1, compounds of general formula N-2, compounds of general formula N-6, compounds of general formula N-7, compounds of general formula N-13, compounds of general formula N-15, compounds of general formula N-17, compounds of general formula N-21, compounds of general formula N-23, compounds of general formula N-24, compounds of general formula N-27, compounds of general formula N-28, compounds of general formula N-29 and compounds of general formula N-30.

[0096] In some embodiments of the present invention, it is preferred to adjust the content of the compound of general formula N so that the liquid crystal composition containing it has a larger elastic constant, higher transmittance, smaller rotational viscosity, better Flicker flicker value, better low-temperature storage stability and better low-temperature miscibility.

[0097] In some embodiments of the present invention, the weight percentage of the compound of formula N in the liquid crystal composition is 0.1%-70% (including any value or sub-range between the ranges), for example, 0.1%, 0.3%, 0.5%, 0.7%, 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%, 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%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 100%, 101%, 102%, 103%, 104%, 105%, 106%, 107%, 108%, 109%, 111%, %, 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%, 66%, 67%, 68%, 69%, 70%, or a range between any two of these values. Preferably, the compound of formula N accounts for 0.1%-60% by weight of the liquid crystal composition.

[0098] In some embodiments of the present invention, the liquid crystal composition comprises at least one (e.g., two, three, four, or five) compound selected from the group consisting of a compound of formula N-1, a compound of formula N-2, a compound of formula N-6, a compound of formula N-7, a compound of formula N-13, a compound of formula N-15, a compound of formula N-17, a compound of formula N-21, a compound of formula N-23, a compound of formula N-24, a compound of formula N-27, a compound of formula N-28, a compound of formula N-29, and a compound of formula N-30, and the weight percentage of the compound in the liquid crystal composition is 0.1%-60% (including any numerical value or sub-range between the ranges), for example, 0.1%, 0.3%, 0.4%, 0.6%, 0.7%, 0.8%, 0.9%, 10.1%, 11.2%, 12.3%, 13.4%, 14.6%, 15.8%, 16.9%, 17.9%, 18.1%, 19.2%, 20.3%, 21.4%, 22.4%, 23. 0.5%, 0.7%, 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%, 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%, or a range between any two of the values.

[0099] In the present invention, “may be replaced by…” means that it may (can) be replaced or not replaced, that is, being replaced or not being replaced falls within the scope of protection of the present invention; the same applies to “may be replaced by…”; moreover, the positions of “replace” and “replace” are arbitrary.

[0100] In the present invention, the short straight lines on one or both sides of the group represent access bonds and do not represent methyl groups (e.g. The short straight line on the left and short straight lines on either side).

[0101] In the present invention, the halogen includes halogen elements such as fluorine, chlorine, bromine or iodine; when the same description is mentioned below, they have the same meaning.

[0102] In the present invention, the halogenated group means that at least one hydrogen atom in the group is replaced by a halogen atom (fluorine, chlorine, bromine or iodine, etc.).

[0103] In the present invention, the numerical range involved in limiting the number of carbon atoms in a group means that the number of carbon atoms can be all optional integers within the limited range, for example, the number of carbon atoms in 1-10 can be 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10, and so on.

[0104] In addition to the above compounds, the liquid crystal composition of the present invention 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, and additives.

[0105] In a preferred technical solution, the liquid crystal composition further includes at least one additive.

[0106] In a preferred technical solution, the additive includes any one or a combination of at least two of a dopant, an antioxidant, an ultraviolet absorber, an infrared absorber, and a light stabilizer.

[0107] Possible dopants that are preferably added to the liquid crystal composition of the present invention are shown below:

[0108] as well as

[0109]

[0110] Wherein, * represents the chiral site.

[0111] In some embodiments of the present invention, the weight percentage of the dopant in the liquid crystal composition is 0%-5%; preferably, the weight percentage of the dopant in the liquid crystal composition is 0.01%-1%.

[0112] In addition, the antioxidants, light stabilizers and other additives used in the liquid crystal composition of the present invention are preferably the following:

[0113] Where n represents a positive integer from 1 to 12; n2 represents a positive integer from 1 to 18; + ” indicates free radicals.

[0114] In some embodiments of the present invention, the weight percentage of the light stabilizer in the liquid crystal composition is 0%-5%; preferably, the weight percentage of the light stabilizer in the liquid crystal composition is 0.01%-1%, more preferably 0.01%-0.1%.

[0115] In a second aspect, the present invention provides a liquid crystal display device comprising the aforementioned liquid crystal composition, which has a faster response speed, a larger contrast ratio, and a wider temperature operating range.

[0116] In a third aspect, the present invention 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 NFFS liquid crystal display mode.

[0117] Compared with the prior art, the present invention has the following beneficial effects:

[0118] The liquid crystal composition provided by the present invention has a large elastic constant, a high transmittance, a low rotational viscosity, and a good Flicker value while maintaining appropriate dielectric anisotropy, good optical anisotropy, and a good clearing point through the mutual compounding of the specific structures and contents of the compounds. While taking into account the performance advantages of compounds containing a cyclohexene structure, it can also make up for defects in low-temperature storage stability and other aspects, and has good low-temperature storage stability; the liquid crystal display device containing it has a faster response speed, a larger contrast, and a wider temperature operating range, which helps to improve low-frequency display and enhance the display effect of liquid crystal materials; and is applied to the high-contrast and fast-response NFFS liquid crystal display mode. DETAILED DESCRIPTION

[0119] The technical solution of the present invention is further described below by way of specific embodiments. It should be understood by those skilled in the art that the embodiments are merely to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0120] For ease of expression, in the following examples and comparative examples, the group structures of the components in the liquid crystal composition are represented by the codes listed in Table 1:

[0121] Table 1

[0122] Take the following compound as an example:

[0123] 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-end 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 a fluorine substituent.

[0124] 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) Δε dielectric anisotropy (1 kHz, 25 °C) K 11 Splay elastic constant (25℃) K 33 Bending elastic constant (25℃) γ1 Rotational viscosity (25℃) RT Response time (ms) Tr Transmittance (%) CR Contrast Ratio Flicker Flicker value (dB) LTS (-30℃) Low temperature storage stability (-30℃, days)

[0125] in,

[0126] Cp: ​​obtained by melting point test;

[0127] Δn: measured using an Abbe refractometer under a sodium lamp (589 nm) at 25°C.

[0128] 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, tested at 25°C, 1 kHz, VA test box, 6 μm thickness;

[0129] K 11 and K 33 : Calculated using an LCR meter and an antiparallel rubbing cell to measure the CV curve of the liquid crystal. Test conditions: VA type test cell, cell thickness 6μm, V = 0.1-20V.

[0130] γ1: measured using the LCM-2 liquid crystal property evaluation system; test conditions: 25°C, 160-260V, test cell thickness 20μm;

[0131] RT: Measured at 25°C using a DMS505 integrated photoelectric tester. Test conditions: 25°C, V100 drive, negative FFS test cell with a cell thickness of 3.0 μm.

[0132] Tr: Use the DMS505 photoelectric integrated 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 FFS type with a thickness of 3.0μm.

[0133] 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, FFS test box with a thickness of 3.0 μm;

[0134] Flicker value: Tested using a DMS505 tester in Flicker mode, and the logarithm of the test value is obtained. Test conditions: 25°C, 60Hz, V22 voltage drive, negative FFS test cell with a cell thickness of 3.0μm.

[0135] LTS (-30°C): The nematic liquid crystal medium is placed in a glass bottle and stored at a constant temperature of -30°C. The time recorded when crystal precipitation is observed.

[0136] 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 dye liquid crystal compositions obtained meet the standards of electronic compounds after testing.

[0137] The dye liquid crystal composition was prepared according to the ratio of each dye liquid crystal composition in the following examples. The dye liquid crystal composition was prepared according to conventional methods in the art, such as mixing in a prescribed ratio by heating, ultrasonication, suspension, etc.

[0138] Example 1

[0139] The liquid crystal composition of Example 1 was prepared according to the compounds listed in Table 2 and their weight percentages in the liquid crystal composition, and then filled between two substrates of a liquid crystal display for performance testing.

[0140] Table 2 Formulation of liquid crystal composition and test results of performance parameters

[0141] Example 2

[0142] The liquid crystal composition of Example 2 was prepared according to the compounds listed in Table 3 and their weight percentages in the liquid crystal composition, and then filled between two substrates of a liquid crystal display for performance testing.

[0143] Table 3 Formulation of liquid crystal composition and test results of performance parameters

[0144] Example 3

[0145] The liquid crystal composition of Example 3 was prepared according to the compounds listed in Table 4 and their weight percentages in the liquid crystal composition, and was filled between two substrates of a liquid crystal display for performance testing.

[0146] Table 4 Formulation and performance parameter test results of liquid crystal composition

[0147] Comparative Example 1

[0148] The liquid crystal composition of Comparative Example 1 was prepared according to the compounds listed in Table 5 and their weight percentages in the liquid crystal composition, and was filled between two substrates of a liquid crystal display for performance testing.

[0149] Table 5 Formulation and performance parameter test results of liquid crystal composition

[0150] From the comparison between Example 3 and Comparative Example 1, it can be seen that the present invention optimizes the structure and content of the compound of Formula I and the compound of Formula II, so that the liquid crystal composition of the present invention has a larger elastic constant (K 11 :14.1VS13.8;K 33 : 15.1VS14.5), higher transmittance (Tr: 15.9VS15.7), better Flicker value (Flicker: -55VS-53), taking into account the performance advantages of compounds containing cyclohexene structure, but also can make up for the defects in low-temperature storage stability and other aspects, with good low-temperature storage stability (LTS (-30℃): 192h VS168h), so that the liquid crystal display device containing it has faster response speed (RT (ms): 19.1VS20.1), larger contrast (CR: 1577VS1530), and wider temperature range of use.

[0151] Example 4

[0152] The liquid crystal composition of Example 4 was prepared according to the compounds listed in Table 6 and their weight percentages in the liquid crystal composition, and was filled between two substrates of a liquid crystal display for performance testing.

[0153] Table 6 Formulation and performance parameter test results of liquid crystal composition

[0154] Example 5

[0155] The liquid crystal composition of Example 5 was prepared according to the compounds listed in Table 7 and their weight percentages in the liquid crystal composition, and was filled between two substrates of a liquid crystal display for performance testing.

[0156] Table 7 Formulation and performance parameter test results of liquid crystal composition

[0157] Example 6

[0158] The liquid crystal composition of Example 6 was prepared according to the compounds listed in Table 8 and their weight percentages in the liquid crystal composition, and was filled between two substrates of a liquid crystal display for performance testing.

[0159] Table 8 Formulation and performance parameter test results of liquid crystal composition

[0160] Example 7

[0161] The liquid crystal composition of Example 7 was prepared according to the compounds listed in Table 9 and their weight percentages in the liquid crystal composition, and was filled between two substrates of a liquid crystal display for performance testing.

[0162] Table 9 Formulation and performance parameter test results of liquid crystal composition

[0163] Example 8

[0164] The liquid crystal composition of Example 8 was prepared according to the compounds listed in Table 10 and their weight percentages in the liquid crystal composition, and was filled between two substrates of a liquid crystal display for performance testing.

[0165] Table 10 Formulation and performance parameter test results of liquid crystal composition

[0166] Example 9

[0167] The liquid crystal composition of Example 9 was prepared according to the compounds listed in Table 11 and their weight percentages in the liquid crystal composition, and was filled between two substrates of a liquid crystal display for performance testing.

[0168] Table 11 Formulation and performance parameter test results of liquid crystal composition

[0169] Example 10

[0170] The liquid crystal composition of Example 10 was prepared according to the compounds listed in Table 12 and their weight percentages in the liquid crystal composition, and was filled between two substrates of a liquid crystal display for performance testing.

[0171] Table 12 Formulation and performance parameter test results of liquid crystal composition

[0172] Comparative Example 2

[0173] The liquid crystal composition of Comparative Example 2 was prepared according to the compounds listed in Table 13 and their weight percentages in the liquid crystal composition, and was filled between two substrates of a liquid crystal display for performance testing.

[0174] Table 13 Formulation and performance parameter test results of liquid crystal composition

[0175] Comparative Example 3

[0176] The liquid crystal composition of Comparative Example 3 was prepared according to the compounds listed in Table 14 and their weight percentages in the liquid crystal composition, and was filled between two substrates of a liquid crystal display for performance testing.

[0177] Table 14 Formulation and performance parameter test results of liquid crystal composition

[0178] From the comparison between the examples and comparative examples of the present application, it can be seen that the present invention optimizes the structure and content of the compound of formula I and the compound of formula II, so that the liquid crystal composition of the present invention has a large elastic constant (K 11 :14.1~17.9;K 33: 14.9-19.1), higher transmittance (Tr(%): 15.8-16.6), smaller rotational viscosity (γ1: 76-117), better Flicker value (Flicker: -67--51), while taking into account the performance advantages of compounds containing cyclohexene structure, it can also make up for the defects in low-temperature storage stability and other aspects, and has good low-temperature storage stability (LTS (-30°C): 192h); so that the liquid crystal display device containing it has faster response speed (RT: 17.5-20.5), larger contrast (CR: 1567-1823), and a wider temperature range of use.

[0179] In summary, the present invention, through the mutual compounding of the specific structure and content of the compounds, enables the liquid crystal composition to have a larger elastic constant, higher transmittance, smaller rotational viscosity, and better Flicker flicker value on the basis of maintaining appropriate dielectric anisotropy, better optical anisotropy, and better clearing point. While taking into account the performance advantages of compounds containing cyclohexene structure, it can also make up for the defects in low-temperature storage stability and have better low-temperature storage stability, so that the liquid crystal display device containing it has a faster response speed, a larger contrast, and a wider temperature range of use, which helps to improve low-frequency display and enhance the display effect of liquid crystal materials, and is suitable for application in high-contrast and fast-response NFFS liquid crystal display mode.

[0180] The applicant declares that the present invention uses the above-described embodiments to illustrate a liquid crystal composition, a liquid crystal display device containing the same, and its applications. However, the present invention is not limited to the above-described embodiments, and this does not necessarily mean that the present invention must rely on the above-described embodiments for implementation. Those skilled in the art should understand that any improvements to the present invention, equivalent replacements for various raw materials in the present invention's products, additions of auxiliary components, and selection of specific methods, etc., fall within the scope of protection and disclosure of the present invention. Industrial Applicability

[0181] The liquid crystal composition and the liquid crystal display device containing the same according to the present invention can be applied to the field of liquid crystal material technology.

Claims

1. A liquid crystal composition, characterized in that, The liquid crystal composition comprises: at least one compound of general formula I: and At least one compound of general formula II: wherein, R A1 and R A2 each independently represents a straight-chain alkyl group having 1 to 12 carbon atoms, a branched-chain alkyl group having 3 to 12 carbon atoms, wherein one or more non-adjacent -CH2- in the straight-chain alkyl group having 1 to 12 carbon atoms or the branched-chain alkyl group having 3 to 12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO- respectively; R B1 and R B2 each independently represents a straight-chain alkyl group having 1 to 12 carbon atoms, a branched-chain alkyl group having 3 to 12 carbon atoms, wherein one or more non-adjacent -CH2- in the straight-chain alkyl group having 1 to 12 carbon atoms or the branched-chain alkyl group having 3 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 At least one loop Or a ring For Ring Sum ring Each independently represents wherein the One or more of the -H therein may be replaced by -F, -Cl, or -CN, and one or more of the -CH= in the rings may be replaced by -N=, the rings One or more of the -CH2- in it may be replaced by -O-, and the compound of Formula II contains at least one ring Z B1 and Z B2 each independently represents a single bond, -CO-O-, -O-CO-, -O-CO-O-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, -CF2CF2-, -CF=CF-, -(CH2)4-, -CF2O- or -OCF2-; n B1 represents 1, 2, or 3, n B2 represents 0 or 1, where when n B1 represents 2 or 3, the ring Same or different, Z B1 Same or different; and, L B1 and L B2 each independently represents -H, a halogen, an alkyl group having 1 to 3 carbon atoms, or an alkoxy group having 1 to 3 carbon atoms.

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 3. The liquid crystal composition according to claim 1, characterized in that, The compound of general formula I accounts for 0.1% - 50% by weight of the liquid crystal composition.

4. The liquid crystal composition according to claim 1, wherein The compound of general formula II is selected from the group consisting of the following compounds: and wherein, Z B11 and Z B12 each independently represents a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -CH2CH2- or -(CH2)4-.

5. The liquid crystal composition according to claim 1, characterized in that, The compound of general formula II accounts for 0.1% - 60% by weight of the liquid crystal composition.

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 alkyl group having 1 to 12 carbon atoms, a branched-chain alkyl group having 3 to 12 carbon atoms, wherein one or more non-adjacent -CH2- in the straight-chain alkyl group having 1 to 12 carbon atoms or the branched-chain alkyl group having 3 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 Among them One or more of the -CH2- therein 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 substituted by a halogen; Z M1 and Z M2 each independently represents a single bond, -CH2CH2-, -C≡C-, -CH=CH-, -(CH2)3-, -(CH2)4-, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CF2CF2-, -CF2O- or -OCF2-; and, n M represents 0, 1, or 2, where when n M represents 0, the ring Sum ring not be When n M represents 2, the ring may be the same or different, Z M2 may be the same or different; The compound of general formula M accounts for 0.1% - 60% by weight of the liquid crystal composition.

7. The liquid crystal composition according to claim 1, characterized in that, The liquid crystal composition further contains at least one compound of general formula N: wherein, R N1 and R N2 each independently represents a straight-chain alkyl group having 1 to 12 carbon atoms, a branched-chain alkyl group having 3 to 12 carbon atoms, wherein one or more non-adjacent -CH2- in the straight-chain alkyl group having 1 to 12 carbon atoms or the branched-chain alkyl group having 3 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 wherein the One or more of the -CH2- therein may be replaced by -O-, wherein the one or more -H in may be substituted by -F, -Cl, or -CN, and one or more -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, a halogen, an alkyl group having 1 to 3 carbon atoms, or an alkoxy group having 1 to 3 carbon atoms; and, n N1 represents 0, 1, 2, or 3, and n N2 represents 0 or 1, and 0 ≤ n N1 + n N2 ≤ 3; when n N1 represents 2 or 3, the ring Same or different, Z N1 Same or different; The compound of general formula N accounts for 0.1% - 70% by weight of the liquid crystal composition.

8. The liquid crystal composition according to claim 7, characterized in that, The compound of general formula N is selected from the group consisting of the following compounds: and 9. 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 - 8.

10. Use of the liquid crystal composition according to any one of claims 1 - 8 in a liquid crystal display device, particularly in an NFFS liquid crystal display mode.

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