Liquid crystal composition, liquid crystal display device containing liquid crystal composition and application of liquid crystal display device

Abstract

The invention provides a liquid crystal composition, a liquid crystal display device containing the liquid crystal composition and application of the liquid crystal display device. The liquid crystal composition comprises at least one compound as shown in a general formula I and at least one compound as shown in a general formula II. According to the liquid crystal composition disclosed by the invention, through mutual compounding of specific structures and contents of the compounds, the liquid crystal composition has relatively large elastic constant, relatively high penetration rate, relatively small rotary viscosity and relatively good Flicker value on the basis of maintaining proper dielectric anisotropy, relatively good optical anisotropy and relatively good clearing point; the performance advantages of a compound containing a cyclohexene structure are considered, the defects of low-temperature storage stability and the like can be overcome, and the low-temperature storage stability is relatively good; a 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 application range; the liquid crystal display panel is applied to a high-contrast fast-response NFFS liquid crystal display mode. # imgabs0 #

Description

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 liquid crystal composition, and applications thereof. Background Art

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

[0003] 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 work by utilizing the optical anisotropy and dielectric anisotropy of the liquid crystal material itself.

[0004] Compared with traditional display devices and display materials, liquid crystal display materials have obvious advantages: low driving voltage, low power consumption, high reliability, large amount of displayed information, color display, no flicker, no harm to the human body, automated production process, low cost, can be made into various specifications and types of liquid crystal displays, easy to carry, etc. Due to these advantages, liquid crystal display technology has had a profound impact on the display and imaging field, and promoted the development of microelectronics technology and optoelectronic information technology. Liquid crystal materials have been widely used in many display occasions due to their good optical properties and photoelectric effects.

[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 dosage is limited, and excessive proportion can easily lead to decreased mutual solubility, affecting performance such as low-temperature storage stability.

[0006] In the application of liquid crystal display devices, the contrast has a critical impact on visual effects. Generally speaking, the greater the contrast, the clearer and more eye-catching the image, and the brighter the color; on the contrary, if the contrast is small, the whole picture will be gray. High contrast is of great help to the clarity, detail and grayscale performance of the image. High-contrast products have advantages in black and white contrast, clarity, integrity and other aspects. Contrast also has a great impact on the display effect of dynamic video. Since the light and dark conversion in dynamic images is relatively fast, the higher the contrast, the easier it is for the human eye to distinguish such a conversion process.

[0007] During the use of a liquid crystal panel, due to the polarity switching of the common electrode signal (Vcom), a horizontal stripe flickering phenomenon occurs, 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 reliability of the liquid crystal panel. Usually, the larger the numerical value of the Flicker flicker value, the more likely the liquid crystal panel is to generate image sticking (IS), and vice versa, it reduces / prevents image sticking. When the Flicker phenomenon is severe, it will lead to increased image sticking of the liquid crystal panel, reduce the display quality, and cause physical discomfort to viewers (such as eye fatigue, vision decline, and dizziness, etc.). Therefore, during the production process of liquid crystal displays, it is necessary to detect its Flicker flicker value and control its Flicker flicker value within a predetermined range.

[0008] At the same time, in order to improve the response speed of liquid crystal display devices, it is necessary to minimize the rotational viscosity of liquid crystal materials. However, generally, the clearing point, optical anisotropy, etc. of low-viscosity liquid crystal materials are relatively low. Therefore, when formulating the liquid crystal composition, other performance requirements need to be considered while reducing the viscosity.

[0009] The formulation of the liquid crystal composition involves simultaneously adjusting many performance parameters of the liquid crystal composition. It is almost impossible to adjust one performance parameter of the liquid crystal composition without affecting the value of another performance parameter. Sometimes, adding a certain monomer liquid crystal to adjust a certain performance parameter of the liquid crystal composition may be beneficial to one or more other performances, but it may also be detrimental to the improvement of some other performances. Therefore, how to obtain a liquid crystal composition that can fully or partially solve the above problems remains an urgent problem in this field. Summary of the Invention

[0010] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a liquid crystal composition, a liquid crystal display device containing the same, and its application. Compared with the prior art, the liquid crystal composition provided by the present invention has a large elastic constant, a high transmittance, a small rotational viscosity, a good Flicker flicker value while maintaining an appropriate dielectric anisotropy, a 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 defects in aspects such as low-temperature storage stability, and has good low-temperature storage stability, enabling the liquid crystal display device containing the same to have a fast response speed, a large contrast ratio, and a wide 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 the high-contrast fast-response NFFS liquid crystal display mode.

[0011] Technical solution

[0012] To achieve this object, the present invention adopts the following technical solutions:

[0013] In a first aspect, the present invention provides a liquid crystal composition, which comprises:

[0014] At least one compound of general formula I:

[0015] And

[0016] At least one compound of general formula II:

[0017]

[0018] Wherein,

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

[0020] R B1 and R B2 each independently represents a straight-chain alkyl group containing 1-12 (for example, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms, a branched-chain alkyl group containing 3-12 (for example, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms, wherein one or more non-adjacent -CH2- in the straight-chain alkyl group containing 1-12 carbon atoms and the branched-chain alkyl group containing 3-12 carbon atoms can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO- respectively;

[0021] Ring and Ring each independently represents At least one ring or Ring is

[0022] Ring and Ring each independently represents wherein said one or more of the -H therein may be replaced by -F, -Cl, or -CN, and one or more of the -CH= in the ring may be replaced by -N=, and one or more of the -CH2- in the ring may be replaced by -O-, and the compound of general 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 represents 1, 2 or 3, and n B2 represents 0 or 1, wherein when n B1 represents 2 or 3, the rings are the same or different, and Z B1 are the same or different; and

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

[0026] In some embodiments of the present invention, R A1 and R A2 each independently represents a straight-chain alkyl group having 1 - 8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms, a branched-chain alkyl group having 3 - 8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms, a straight-chain alkoxy group having 1 - 8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms, a branched-chain alkoxy group having 3 - 8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms, a straight-chain alkenyl group having 2 - 8 (e.g., 2, 3, 4, 5, 6, 7 or 8) carbon atoms, or a branched-chain alkenyl group having 3 - 8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms.

[0027] In some embodiments of the present invention, R B1 and R B2Each independently represents a straight-chain alkyl group having 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched-chain alkyl group having 3 to 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms, a straight-chain alkoxy group having 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched-chain alkoxy group having 3 to 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms, a straight-chain alkenyl group having 2 to 8 (e.g., 2, 3, 4, 5, 6, 7, or 8) carbon atoms, or a branched-chain alkenyl group having 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) - (V9), and particularly preferably formulas (V1), (V2), (V8), or (V9). The groups represented by formulas (V1) to (V9) are as follows:

[0031] Wherein, " X " represents a carbon atom in the ring structure to which it is bonded.

[0032] In the present invention, when n B1 = 2, there are two rings in the compound These two rings Can have the same structure or different structures. Exemplarily, one can be The other can be When the expression "the same or different" is involved in the present invention, it has the same meaning.

[0033] In some embodiments of the present invention, the compounds of general formula I are selected from the group consisting of the following compounds:

[0034]

[0035] And

[0036]

[0037] In some embodiments of the present invention, in order to obtain a relatively large elastic constant, a relatively high transmittance, a relatively small rotational viscosity, a relatively good Flicker value, relatively good low-temperature storage stability, and relatively good low-temperature miscibility, 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 compounds of general formula I-1 and the compounds of general formula I-3.

[0038] In some embodiments of the present invention, in order to obtain a relatively large elastic constant, a relatively high transmittance, a relatively small rotational viscosity, a relatively good Flicker value, relatively good low-temperature storage stability, and relatively good low-temperature miscibility, the compound of general formula I preferably comprises at least one (e.g., two, three, four, or five) compound selected from the group consisting of the following compounds:

[0039]

[0040]

[0041] and

[0042]

[0043] wherein,

[0044] R A1 and R A2 each independently represents a straight-chain alkyl group containing 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, or a branched-chain alkyl group containing 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms;

[0045] R A11 and R A21 each independently represents a straight-chain alkenyl group containing 2-8 (e.g., 2, 3, 4, 5, 6, 7, or 8) carbon atoms, or a branched-chain alkenyl group containing 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms;

[0046] R A12 and R A22 each independently represents a straight-chain alkoxy group containing 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, or a branched-chain alkoxy group containing 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms.

[0047] In some embodiments of the present invention, it is preferred to adjust the content of the compound of general formula I such that the liquid crystal composition containing the same has a relatively large elastic constant, a relatively high transmittance, a relatively small rotational viscosity, a relatively good Flicker value, relatively good low-temperature storage stability, and relatively good low-temperature miscibility.

[0048] In some embodiments of the present invention, the compound of general formula I accounts for 0.1% - 50% by weight of the liquid crystal composition (including any value or sub-range within this range), 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 the range between any two of these values. Preferably, the compound of general formula I accounts for 0.1% - 30% by weight of the liquid crystal composition.

[0049] 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 the compounds of general formula I-1 and the compounds of general formula I-3, which accounts for 0.1% - 30% by weight of the liquid crystal composition (including any value or sub-range within this range), 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 the range between any two of these values.

[0050] 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 the compounds of general formula I-1-1, the compounds of general formula I-1-2, the compounds of general formula I-1-3, the compounds of general formula I-1-4 and the compounds of general formula I-1-5, which accounts for 1% - 20% by weight of the liquid crystal composition (including any value or sub-range within 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 the range between any two of these values.

[0051] In some embodiments of the present invention, the compounds of general formula II are selected from the group consisting of the following compounds:

[0052]

[0053] and

[0054] and

[0055]

[0056] wherein

[0057] Z B11 and Z B12 each independently represents a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -CH2CH2- or -(CH2)4-.

[0058] 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 value, a better low-temperature storage stability, and a 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:

[0059]

[0060]

[0061] wherein

[0062] R B11 and R B2 represent a straight-chain alkyl group having 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms, a branched-chain alkyl group having 3-8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms, a straight-chain alkoxy group having 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms, or a branched-chain alkoxy group having 3-8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms;

[0063] R B12 represents a straight-chain alkenyl group having 2-8 (e.g., 2, 3, 4, 5, 6, 7 or 8) carbon atoms, or a branched-chain alkenyl group having 3-8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms.

[0064] In some embodiments of the present invention, it is preferred to adjust the content of the compound of formula II such that the liquid crystal composition containing it has a larger elastic constant, a higher transmittance, a smaller rotational viscosity, a better Flicker value, a better low-temperature storage stability, and a better low-temperature miscibility.

[0065] In some embodiments of the present invention, the compound of general formula II accounts for 0.1% - 60% by weight of the liquid crystal composition (including any value or sub-range within this range), 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 the range between any two values therein. Preferably, the compound of general formula II accounts for 0.1% - 45% by weight of the liquid crystal composition.

[0066] 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 value, a better low-temperature storage stability, and a better low-temperature miscibility, the liquid crystal composition comprises at least one (for example, two, three, four, or five) compound selected from the group consisting of the compound of general formula II-1, the compound of general formula II-3, the compound of general formula II-4, the compound of general formula II-6, the compound of general formula II-8, and the compound of general formula II-10, which accounts for 0.1% - 40% by weight of the liquid crystal composition (including any value or sub-range within this range), 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%, or the range between any two values therein.

[0067] 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 general formula II-1-1-2, compounds of general formula II-1-2-1, compounds of general formula II-3-1-1, compounds of general formula II-4-1-1, compounds of general formula II-6-1-1, compounds of general formula II-8-1-1, compounds of general formula II-10-1-1, compounds of general formula II-10-2-1, and compounds of general formula II-10-2-2, and the weight percentage thereof in the liquid crystal composition is 1% - 40% (including any value or sub-range within this range), e.g., 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 the range between any two of these values.

[0068] In some embodiments of the present invention, the liquid crystal composition of the present invention further comprises at least one compound of general formula M:

[0069]

[0070] Wherein,

[0071] R M1 and R M2 each independently represents a straight-chain alkyl group containing 1 - 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 - 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 straight-chain alkyl group containing 1 - 12 carbon atoms and the branched-chain alkyl group containing 3 - 12 carbon atoms can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO- respectively;

[0072] Ring Ring and Ring each independently represents Wherein one or more -CH2- therein can be replaced by -O-, and one or at most two single bonds in the ring can be replaced by double bonds, at most one -H therein can be replaced by a halogen;

[0073] 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,

[0074] n M represents 0, 1 or 2, where when n M represents 0, the ring and the ring is not When n M represents 2, the rings may be the same or different, and Z M2 may be the same or different.

[0075] In some embodiments of the present invention, preferably, R M1 and R M2 each independently represents a straight-chain alkyl group having 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms, a branched-chain alkyl group having 3-8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms, a straight-chain alkoxy group having 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms, a branched-chain alkoxy group having 3-8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms, a straight-chain alkenyl group having 2-8 (e.g., 2, 3, 4, 5, 6, 7 or 8) carbon atoms, a branched-chain alkenyl group having 3-8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms,

[0076] In some embodiments of the present invention, preferably, any one of R M1 and R M2 is a straight-chain alkoxy group having 1-8 carbon atoms, a straight-chain alkenyl group having 2-8 carbon atoms, a branched-chain alkenyl group having 3-8 carbon atoms, or a branched-chain alkoxy group having 3-8 carbon atoms, and the other is a straight-chain alkyl group having 1-8 carbon atoms, or a branched-chain alkyl group having 3-8 carbon atoms.

[0077] In some embodiments of the present invention, the compounds of formula M are selected from the group consisting of the following compounds:

[0078]

[0079]

[0080]

[0081] In some embodiments of the present invention, in order to obtain a relatively large elastic constant, a relatively high transmittance, a relatively small rotational viscosity, a relatively good Flicker value, a relatively good low-temperature storage stability, and a relatively good low-temperature miscibility, the compound of general formula M comprises at least one (e.g., two, three, four, or five) compound selected from the group consisting of the compounds of general formula M-1, the compounds of general formula M-12, the compounds of general formula M-13, the compounds of general formula M-16, the compounds of general formula M-17, and the compounds of general formula M-18.

[0082] In some embodiments of the present invention, in order to obtain a relatively large elastic constant, a relatively high transmittance, a relatively small rotational viscosity, a relatively good Flicker value, a relatively good low-temperature storage stability, and a relatively good low-temperature miscibility, preferably, the compound of general formula M comprises at least one (e.g., two, three, four, or five) compound selected from the group consisting of the following compounds:

[0083]

[0084]

[0085] and

[0086]

[0087] wherein,

[0088] R M1 and R M2 each independently represents a straight-chain alkyl group having 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, or a branched-chain alkyl group having 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms;

[0089] R M11 and R M21 each independently represents a straight-chain alkenyl group having 2-8 (e.g., 2, 3, 4, 5, 6, 7, or 8) carbon atoms, or a branched-chain alkenyl group having 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms;

[0090] R M22 represents a straight-chain alkoxy group having 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, or a branched-chain alkoxy group having 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms.

[0091] In some embodiments of the present invention, it is preferred to adjust the content of the compound of general formula M such that the liquid crystal composition containing the same has a large elastic constant, a high transmittance, a small rotational viscosity, a good Flicker value, a good low-temperature storage stability, and a good low-temperature miscibility.

[0092] 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 value or sub-range within 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 the range between any two of these values. Preferably, the weight percentage of the compound of general formula M in the liquid crystal composition is 0.1% - 45%.

[0093] 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 the compounds of general formula M-1, general formula M-12, general formula M-13, general formula M-16, general formula M-17, and general formula M-18, and the weight percentage thereof in the liquid crystal composition is 0.1% - 45% (including any value or sub-range within this 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 the range between any two of these values.

[0094] In some embodiments of the present invention, the liquid crystal composition comprises at least one (e.g., two, three, four, or five) compound of the general formula M-1-3, a compound of the general formula M-12-1, a compound of the general formula M-12-3, a compound of the general formula M-13-1, a compound of the general formula M-13-2, a compound of the general formula M-16-3, a compound of the general formula M-17-2, and a compound of the general formula M-18-3, which accounts for 1%-45% (including any value or sub-range within this range) by weight of the liquid crystal composition, e.g., 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 the range between any two of these values.

[0095] 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:

[0096]

[0097] Wherein,

[0098] R N1 and R N2 each independently represents a straight-chain alkyl group containing 1-12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, a branched-chain alkyl group containing 3-12 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, wherein one or more non-adjacent -CH2- in the straight-chain alkyl group containing 1-12 carbon atoms and the branched-chain alkyl group containing 3-12 carbon atoms can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO- respectively;

[0099] Ring and Ring each independently represents wherein one or more -CH2- in the can be replaced by -O-, and one or more -H in the can be replaced by -F, -Cl, or -CN, and one or more -CH= in the ring can be replaced by -N=;

[0100] Z N1 and ZN2 Each independently represents a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, -CF2CF2-, -(CH2)4-, -CF2O- or -OCF2-;

[0101] L N1 and L N2 Each independently represents -H, a halogen, an alkyl group having 1 - 3 (e.g., 1, 2 or 3) carbon atoms, or an alkoxy group having 1 - 3 (e.g., 1, 2 or 3) carbon atoms; and,

[0102] n N1 represents 0, 1, 2 or 3, n N2 represents 0 or 1, and 0 ≤ n N1 + n N2 ≤ 3; when n N1 represents 2 or 3, the rings are the same or different, Z N1 are the same or different.

[0103] In some embodiments of the present invention, preferably, R N1 and R N2 Each independently represents a straight-chain alkyl group having 1 - 8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms, a branched-chain alkyl group having 3 - 8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms, a straight-chain alkoxy group having 1 - 8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms, a branched-chain alkoxy group having 3 - 8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms, a straight-chain alkenyl group having 2 - 8 (e.g., 2, 3, 4, 5, 6, 7 or 8) carbon atoms, or a branched-chain alkenyl group having 3 - 8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms.

[0104] 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-.

[0105] In some embodiments of the present invention, preferably, L N1 and L N2 both represent -H.

[0106] In some embodiments of the present invention, the compounds of general formula N are selected from the group consisting of the following compounds:

[0107]

[0108]

[0109]

[0110] N-19。

[0111] In some embodiments of the present invention, in order to obtain a relatively large elastic constant, a relatively high transmittance, a relatively small rotational viscosity, a relatively good Flicker value, relatively good low-temperature storage stability, and relatively good low-temperature miscibility, the compound of general formula N comprises at least one (e.g., two, three, four, or five) compound selected from the group consisting of the compounds of general formula N-1, the compounds of general formula N-2, the compounds of general formula N-6, the compounds of general formula N-7, the compounds of general formula N-13, the compounds of general formula N-15, the compounds of general formula N-17, the compounds of general formula N-21, the compounds of general formula N-23, the compounds of general formula N-24, the compounds of general formula N-27, the compounds of general formula N-28, the compounds of general formula N-29, and the compounds of general formula N-30.

[0112] In some embodiments of the present invention, it is preferable to adjust the content of the compound of general formula N such that the liquid crystal composition containing the same has a relatively large elastic constant, a relatively high transmittance, a relatively small rotational viscosity, a relatively good Flicker value, relatively good low-temperature storage stability, and relatively good low-temperature miscibility.

[0113] In some embodiments of the present invention, the weight percentage of the compound of general formula N in the liquid crystal composition is 0.1% - 70% (including any value or sub-range within this range), e.g., 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%, or the range between any two of these values. Preferably, the weight percentage of the compound of general formula N in the liquid crystal composition is 0.1% - 60%.

[0114] 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 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, compounds of general formula N-30, and the weight percentage of the compound in the liquid crystal composition is 0.1%-60% (including any value or sub-range within this range), 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 the range between any two of these values.

[0115] In the present invention, "can be independently substituted by..." means that it can be substituted or not, that is, both being substituted and not being substituted are within the protection scope of the present invention; the same applies to "can be independently replaced by..."; moreover, the positions of "substitution" and "replacement" are arbitrary.

[0116] In the present invention, the short straight lines on one or both sides of the group represent the bonding keys and do not represent methyl groups (e.g., the short straight line on the left and the short straight lines on both sides).

[0117] In the present invention, the halogen includes halogen elements such as fluorine, chlorine, bromine, or iodine; when the same description is involved hereinafter, it has the same meaning.

[0118] In the present invention, "halogenated" means that at least one hydrogen in the group is substituted by a halogen (such as fluorine, chlorine, bromine, or iodine).

[0119] In the present invention, the numerical range involved when defining the number of carbon atoms in the group means that the number of carbon atoms can be all optional integers within the defined range. For example, the number of carbon atoms from 1 to 10 can be 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10, and so on.

[0120] In addition to the above compounds, the liquid crystal composition of the present invention may also contain any one or a combination of at least two of ordinary nematic liquid crystals, smectic liquid crystals, cholesteric liquid crystals, polymerizable monomers, and additives.

[0121] In a preferred technical solution, the liquid crystal composition further includes at least one additive.

[0122] 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.

[0123] The following shows the possible dopants preferably added to the liquid crystal composition of the present invention:

[0124]

[0125]

[0126] And

[0127]

[0128] Among them, * represents a chiral site.

[0129] In some embodiments of the present invention, the weight percentage content of the dopant in the liquid crystal composition is 0% - 5%; preferably, the weight percentage content of the dopant in the liquid crystal composition is 0.01% - 1%.

[0130] In addition, additives such as antioxidants and light stabilizers used in the liquid crystal composition of the present invention are preferably the following substances:

[0131]

[0132]

[0133]

[0134]

[0135] Among them, n represents a positive integer from 1 to 12; n2 represents a positive integer from 1 to 18; "+" represents a radical.

[0136] In some embodiments of the present invention, the weight percentage content of the light stabilizer in the liquid crystal composition is 0% - 5%; preferably, the weight percentage content of the light stabilizer in the liquid crystal composition is 0.01% - 1%, and more preferably 0.01% - 0.1%.

[0137] 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 range of use.

[0138] Third aspect, the present invention provides an application of the aforementioned liquid crystal composition in a liquid crystal display device. The aforementioned liquid crystal composition is particularly suitable for the NFFS liquid crystal display mode with high contrast and fast response.

[0139] Compared with the prior art, the present invention has the following beneficial effects:

[0140] In the liquid crystal composition provided by the present invention, through the mutual compounding of the specific structures and contents of the compounds, while maintaining appropriate dielectric anisotropy, good optical anisotropy, and good clearing point, it has a large elastic constant, a high transmittance, a small rotational viscosity, and a good Flicker flicker value. While taking into account the performance advantages of the compound containing a cyclohexene structure, it can also make up for the defects in aspects such as low-temperature storage stability, and has good low-temperature storage stability; enabling the liquid crystal display device containing it to have a faster response speed, a larger contrast ratio, 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 applied to the NFFS liquid crystal display mode with high contrast and fast response. Specific Embodiments

[0141] The technical solutions of the present invention will be further described below through specific embodiments. Those skilled in the art should understand that the embodiments are only for helping to understand the present invention and should not be regarded as specific limitations on the present invention.

[0142] For the convenience 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:

[0143] Table 1

[0144]

[0145]

[0146] Taking the compound with the following structural formula as an example:

[0147]

[0148] If this structural formula is represented by the codes listed in Table 1, it can be expressed as: nCCGF. The n in the code represents the number of C atoms of the alkyl group at the left end. For example, when n is "3", it means that the alkyl group is -C3H7; the C in the code represents 1,4-cyclohexylene, G represents 2-fluoro-1,4-phenylene, and F represents a fluorine substituent.

[0149] The abbreviated codes for the test items in the following examples and comparative examples are as follows:

[0150] Cp Clearing point (nematic-isotropic phase transition temperature, °C)

[0151] Δn Optical anisotropy (589 nm, 25 °C)

[0152] Δε Dielectric anisotropy (1 kHz, 25 °C)

[0153] K 11 Splay elastic constant (25 °C)

[0154] K 33 Bend elastic constant (25 °C)

[0155] γ1 Rotational viscosity (25 °C)

[0156] RT Response time (ms)

[0157] Tr Transmittance (%)

[0158] CR Contrast ratio

[0159] Flicker Flicker value (dB)

[0160] LTS(-30 °C) Low temperature storage stability (-30 °C, days)

[0161] Among them,

[0162] Cp: Obtained by testing with a melting point instrument;

[0163] Δn: Obtained by testing with an Abbe refractometer under a sodium lamp (589 nm) light source at 25 °C;

[0164] Δε: Δε = ε ∥ -ε ⊥ where ε ∥ is the dielectric constant parallel to the molecular axis, and ε ⊥ is the dielectric constant perpendicular to the molecular axis. Test conditions: 25 °C, 1 kHz, VA type test cell, cell thickness 6 μm;

[0165] K 11 and K 33 : Obtained by testing the C-V curve of the liquid crystal with an LCR meter and an antiparallel friction cell and performing calculations; Test conditions: VA type test cell, cell thickness 6 μm, V = 0.1 - 20 V;

[0166] γ1: Obtained by testing with an LCM-2 type liquid crystal physical property evaluation system; Test conditions: 25 °C, 160 - 260 V, test cell thickness 20 μm;

[0167] RT: Measured at 25 °C using a DMS505 optoelectronic comprehensive tester; test conditions: a negative FFS-type test cell at 25 °C, V100 drive, and a cell thickness of 3.0 μm.

[0168] Tr: The V-T curve of the dimming device was measured using a DMS505 optoelectronic comprehensive tester. The maximum value of the transmittance on the V-T curve was taken as the transmittance of the liquid crystal. The test cell was of the negative FFS type with a cell thickness of 3.0 μm.

[0169] CR: The transmittance of the liquid crystal cell was measured using a DMS 505 tester at 255 gray-scale voltages and 0 gray-scale voltage, namely T r255 and T r0 , and CR was obtained from T r255 / T r0 ; test conditions: an FFS-type test cell at 25 °C with a cell thickness of 3.0 μm.

[0170] Flicker value: Measured using a DMS505 tester in the Flicker mode and taking the logarithm of the measured value; test conditions: a negative FFS-type test cell at 25 °C, 60 Hz, V22 voltage drive, and a cell thickness of 3.0 μm.

[0171] LTS(-30 °C): The nematic liquid crystal medium was placed in a glass bottle and stored at a constant temperature of -30 °C. The time was recorded when crystal precipitation was observed.

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

[0173] The dye liquid crystal compositions were prepared according to the ratios of the dye liquid crystal compositions in the following examples. The preparation of the dye liquid crystal compositions was carried out according to the conventional methods in the art, such as by heating, ultrasonic waves, suspension, etc., and mixing in accordance with the specified ratios.

[0174] Example 1

[0175] 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 it was filled between the two substrates of the liquid crystal display for performance testing.

[0176] Table 2 Formulation of the liquid crystal composition and test results of performance parameters

[0177]

[0178] Example 2

[0179] 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 it was filled between two substrates of a liquid crystal display for performance testing.

[0180] Table 3 Formulation of Liquid Crystal Composition and Test Results of Performance Parameters

[0181]

[0182]

[0183] Example 3

[0184] 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 it was filled between two substrates of a liquid crystal display for performance testing.

[0185] Table 4 Formulation of Liquid Crystal Composition and Test Results of Performance Parameters

[0186]

[0187] Comparative Example 1

[0188] 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 it was filled between two substrates of a liquid crystal display for performance testing.

[0189] Table 5 Formulation of Liquid Crystal Composition and Test Results of Performance Parameters

[0190]

[0191]

[0192] From the comparison between Example 3 and Comparative Example 1, it can be seen that through the optimization of the structures and contents of the compounds of General Formula I and General Formula II in the present invention, the liquid crystal composition of the present invention has a larger elastic constant (K 11 : 14.1 VS 13.8; K 33: (15.1 VS 14.5), higher transmittance (Tr: 15.9 VS 15.7), better Flicker value (Flicker: -55 VS -53). While taking into account the performance advantages of the compound containing cyclohexene structure, it can also make up for defects in aspects such as low-temperature storage stability and has good low-temperature storage stability (LTS(-30°C): 192h VS 168h), enabling the liquid crystal display device containing it to have a faster response speed (RT(ms): 19.1 VS 20.1), a larger contrast ratio (CR: 1577 VS 1530), and a wider temperature range of use.

[0193] Example 4

[0194] 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 it was filled between two substrates of a liquid crystal display for performance testing.

[0195] Table 6 Formulation of Liquid Crystal Composition and Test Results of Performance Parameters

[0196]

[0197]

[0198] Example 5

[0199] 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 it was filled between two substrates of a liquid crystal display for performance testing.

[0200] Table 7 Formulation of Liquid Crystal Composition and Test Results of Performance Parameters

[0201]

[0202] Example 6

[0203] 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 it was filled between two substrates of a liquid crystal display for performance testing.

[0204] Table 8 Formulation of Liquid Crystal Composition and Test Results of Performance Parameters

[0205]

[0206]

[0207] Example 7

[0208] 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 it was filled between two substrates of a liquid crystal display for performance testing.

[0209] Table 9 Formulation of Liquid Crystal Composition and Test Results of Performance Parameters

[0210]

[0211] Example 8

[0212] 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 it was filled between two substrates of a liquid crystal display for performance testing.

[0213] Table 10 Formulation of Liquid Crystal Composition and Test Results of Performance Parameters

[0214]

[0215]

[0216] Example 9

[0217] 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 it was filled between two substrates of a liquid crystal display for performance testing.

[0218] Table 11 Formulation of Liquid Crystal Composition and Test Results of Performance Parameters

[0219]

[0220] Example 10

[0221] 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 it was filled between two substrates of a liquid crystal display for performance testing.

[0222] Table 12 Formulation of Liquid Crystal Composition and Test Results of Performance Parameters

[0223]

[0224]

[0225] Comparative Example 2

[0226] 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 it was filled between two substrates of a liquid crystal display for performance testing.

[0227] Table 13 Formulation of Liquid Crystal Composition and Test Results of Performance Parameters

[0228]

[0229] Comparative Example 3

[0230] 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 it was filled between two substrates of a liquid crystal display for performance testing.

[0231] Table 14 Formulation of Liquid Crystal Composition and Test Results of Performance Parameters

[0232]

[0233]

[0234] From the comparison between the examples and comparative examples of the present application, it can be seen that by optimizing the structures and contents of the compounds of General Formula I and General Formula II, 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), a high transmittance (Tr(%): 15.8 - 16.6), a small rotational viscosity (γ1: 76 - 117), a good Flicker value (Flicker: -67 - 51), while maintaining an appropriate dielectric anisotropy (Δε: -4.7 to -3.2), a good optical anisotropy (Δn: 0.105 to 0.117), and a good clearing point (Cp: 75 to 92). While taking into account the performance advantages of the compound containing a cyclohexene structure, it can also make up for defects in aspects such as low-temperature storage stability and has good low-temperature storage stability (LTS(-30°C): 192h); enabling the liquid crystal display device containing it to have a fast response speed (RT: 17.5 - 20.5), a large contrast ratio (CR: 1567 - 1823), and a wide temperature range of use.

[0235] In summary, through the mutual compounding of the specific structures and contents of the compounds, the liquid crystal composition of the present invention has a large elastic constant, a high transmittance, a small rotational viscosity, and a good Flicker value while maintaining an appropriate dielectric anisotropy, a good optical anisotropy, and a good clearing point. While taking into account the performance advantages of the compound containing a cyclohexene structure, it can also make up for defects in aspects such as low-temperature storage stability and has good low-temperature storage stability, enabling the liquid crystal display device containing it to have a fast response speed, a large contrast ratio, and a wide 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 the NFFS liquid crystal display mode with high contrast and fast response.

[0236] The applicant declares that the present invention illustrates a liquid crystal composition, a liquid crystal display device comprising the same, and its application through the above embodiments, but the present invention is not limited to the above embodiments, that is, it does not mean that the present invention must rely on the above embodiments to be implemented. Those skilled in the art should understand that any improvement of the present invention, the equivalent substitution of each raw material of the product of the present invention, the addition of auxiliary components, the selection of specific methods, etc. all fall within the protection scope and the disclosure scope of the present invention.

Claims

1. A liquid crystal composition, characterized in that, The liquid crystal composition comprises: at least one compound of general formula I: 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 and 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-; 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 and 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-; Ring and a ring each independently represents at least one ring or a ring is Ring and the ring each independently represents wherein one or more of the -H therein may be replaced by -F, -Cl, or -CN, and one or more of the >CH= in the ring may be replaced by >N=, and one or more of the -CH2- in the ring 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, wherein when n B1 represents 2 or 3, the ring are the same or different, Z B1 are the 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, characterized in that, 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, wherein 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, characterized in that, 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 and 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-; Ring Ring and the ring each independently represents wherein 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 therein may be replaced 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 rings and the rings are not When n M represents 2, the rings can be the same or different, and Z M2 can 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 comprises 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 and 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-; Ring and the ring each independently represents wherein one or more of the -CH2- therein may be replaced by -O-, and one or more of the -H therein may be replaced by -F, -Cl, or -CN, and -CH= in one or more rings 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, n N2 represents 0 or 1, and 0 ≤ n N1 + n N2 ≤ 3; when n N1 represents 2 or 3, the rings are the same or different, Z N1 are the 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 the NFFS liquid crystal display mode.

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