Liquid crystal composition and liquid crystal display device

Abstract

The invention provides a liquid crystal composition and a 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 F. According to the liquid crystal composition disclosed by the invention, through cooperation of the compounds as shown in the general formula I and the general formula F, the composition has a relatively large K value, relatively high contrast ratio, relatively low Flicker and relatively long low-temperature storage time, so that a liquid crystal display device containing the liquid crystal composition disclosed by the invention has relatively high contrast ratio and relatively high response speed.

Description

Technical Field

[0001] This invention belongs to the field of liquid crystal material technology, specifically relating to a liquid crystal composition and a liquid crystal display device, and more particularly to a liquid crystal composition and a liquid crystal display device comprising a dioxane-cyclohexene structure compound. Background Technology

[0002] Liquid crystal displays (LCDs) have experienced rapid development due to their small size, light weight, low power consumption, and excellent display quality, especially in portable electronic information products. With the increasing size of LCD screens used in portable computers, office applications, and video applications, LCDs have been able to be used for large-screen displays and have ultimately replaced cathode ray tube (CRT) displays.

[0003] Compared to traditional display devices and materials, liquid crystal display (LCD) materials have significant advantages: low driving voltage, minimal power consumption, high reliability, large display information capacity, color display, flicker-free operation, no harm to the human body, automated production process, low cost, and the ability to be manufactured into various specifications and types of LCD displays, making them portable. Due to these advantages, LCD technology has profoundly impacted the field of display imaging, promoting the development of microelectronics and optoelectronic information technology. Liquid crystal materials, with their excellent optical properties and photoelectric effects, have found widespread application in numerous display scenarios.

[0004] In recent years, the market demand for LCD monitors has increasingly focused on high-quality display effects in certain aspects to meet specific display requirements, such as ultra-high contrast ratio, low power consumption and long battery life, realistic saturation, ultra-high definition, and ultra-fast response speed. Ultra-high contrast ratio displays are among the most important applications, with significant value in commercial fields such as high-specification home displays, building flaw detection, surgical projection, and public display screens. Low power consumption and long battery life have also been a major focus in recent years. One method is to reduce the monitor's refresh rate to save power; however, LCD monitors are prone to flickering at low frequencies, thus requiring methods such as increasing the K-value to improve low-frequency display and achieve low power consumption. Therefore, the industry urgently needs to find a liquid crystal hybrid suitable for manufacturing ultra-high contrast ratio monitors and with a large K-value. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a liquid crystal composition with negative dielectric anisotropy and a liquid crystal display device. Compared to existing technologies, the liquid crystal composition provided by the present invention can significantly improve the K value (K0). 11 K 33It improves contrast, reduces flicker, enhances compatibility and low-temperature storage performance, and is suitable for fast-response, high-contrast display modes such as IPS, NFFS, and VA.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a liquid crystal composition comprising:

[0008] At least one compound of general formula I:

[0009] as well as

[0010] At least one compound of general formula F:

[0011]

[0012] Wherein, R1 and R2 each independently represent -H, a straight-chain or branched alkyl group containing 1-12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, In the alkyl group containing 1-12 carbon atoms, one or more of the -CH2- groups (either straight-chain or branched) can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-, and in the alkyl group containing 1-12 carbon atoms, one or more of the -H groups (either straight-chain or branched) can be independently replaced by -F.

[0013] ring ring Each represents independently At least one ring or ring express

[0014] ring ring Each represents independently

[0015] n1 is either 0 or 1;

[0016] R F1 and R F2 Each independently represents -H, halogen, or a straight-chain or branched alkyl group containing 1-12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms. The alkyl group containing 1-12 carbon atoms, whether straight-chain or branched, One or more non-adjacent -CH2- can be independently replaced by -CH=CH-, -C≡C-, -O-, -S-, -CO-, -CO-O- or -O-CO-, and one or more -H in the straight-chain or branched alkyl group containing 1-12 carbon atoms can be independently replaced by -F or -Cl.

[0017] ring and ring Each represents independently in One or more non-adjacent -CH2- bonds in one or more rings can be replaced by -O- bonds, and at most two non-adjacent single bonds in one or more rings can be replaced by double bonds. One or more -H can be independently replaced by -CN, -F or -Cl, and -CH= in one or more rings can be replaced by -N=;

[0018] X F Indicates -O-, -S-, or -CO-;

[0019] L F1 and L F2 Each can be independently represented as -H, -F, -Cl, -CF3, or -OCF3;

[0020] Z F1 and Z F2 Each can independently represent a single bond, -O-, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -(CH2)2O-, -O(CH2)2-, -CH=CH-, -C≡C-, -CH2CH2-, -CF2CF2-, -(CH2)3-, -(CH2)4-, -CF2O-, or -OCF2-;

[0021] n F1 and n F2 Each can be independently represented as 0, 1, or 2, where when n F1 When 2 is represented, the ring They can be the same or different, where when n F2 When 2 is represented, the ring They can be the same or different, Z F2 They can be the same or different; and

[0022] n F4 Represents an integer between 0 and 4 (e.g., 0, 1, 2, 3, or 4).

[0023] The liquid crystal composition provided by this invention contains a dioxane-cyclohexene structure. Compared to conventional liquid crystal mixtures composed of benzene rings, cyclohexane, fluorobenzenes, monooxane, etc., the monomers containing dioxane and cyclohexene exhibit higher elastic strength due to the high structural strength of ether bonds and double bonds. Furthermore, the lone pair electrons contained in the two oxygen atoms can form conjugations with cyclohexene, greatly enhancing the K value (K0) of the entire compound. 11 K 33 This makes it less prone to elastic deformation when molecules are driven in an electric field, thereby improving the contrast and flicker of the display; liquid crystal compounds with a dioxane-cyclohexene structure also have advantages such as good miscibility, strong stability and fast response in liquid crystal mixtures, and perform well in both positive and negative liquid crystal materials.

[0024] Liquid crystal compounds containing a dioxane-cyclohexene structure (general formula I) can achieve large K values ​​(K0) when used in combination with negative dibenzoxanone compounds. 11 K 33 It features fast response speed, high transmittance and high contrast, as well as excellent compatibility and a wide operating temperature range. It is suitable for fast response, high contrast display modes such as IPS, NFFS and VA, and has good application prospects in high-specification home display, building engineering flaw detection, surgical projection, and low-power laptops, monitors, notebooks and other fields.

[0025] In some embodiments of the present invention, the compound of general formula I accounts for 1%-30% by weight of the liquid crystal composition, for example 1%, 2%, 3%, 4%, 5%, 6%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%, 10.5%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, or 30%, preferably 3%-15%, and more preferably 5%-12%.

[0026] In some embodiments of the present invention, the compounds of general formula I are selected from the group consisting of:

[0027]

[0028]

[0029]

[0030] as well as

[0031]

[0032] Wherein, R1 and R2 each independently represent a straight-chain or branched alkyl group containing 1-10 carbon atoms, wherein one or more non-adjacent -CH2- groups of the straight-chain or branched alkyl group containing 1-10 carbon atoms can be independently replaced by -CH=CH- or -O-.

[0033] In some embodiments of the invention, R1 and R2 each independently represent a straight-chain or branched alkyl group containing 1-10 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10) carbon atoms, a straight-chain or branched alkoxy group containing 1-9 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, or 9) carbon atoms, or a straight-chain or branched alkenyl group containing 2-9 (e.g., 2, 3, 4, 5, 6, 7, 8, or 9) carbon atoms.

[0034] In some embodiments of the present invention, the compound of general formula I comprises at least one (e.g., two) compound selected from the group consisting of the compound of general formula I-1, the compound of general formula I-2, the compound of general formula I-4, the compound of general formula I-10, and the compound of general formula I-11.

[0035] In some embodiments of the present invention, the compound of general formula I comprises at least one (e.g., two) compound selected from the group consisting of compounds of general formula I-1-1, general formula I-1-2, general formula I-1-3, general formula I-2-1, general formula I-2-2, general formula I-2-3, general formula I-4-1, general formula I-4-2, general formula I-4-3, general formula I-10-1, general formula I-10-2, general formula I-10-3, general formula I-11-1, general formula I-11-2, and general formula I-11-3.

[0036]

[0037]

[0038] as well as

[0039]

[0040] in,

[0041] R 21 It refers to a straight-chain or branched alkyl group containing 1-8 carbon atoms; and

[0042] R 22 It refers to a straight-chain or branched alkenyl group containing 2-8 carbon atoms.

[0043] In some embodiments of the present invention, the compound contains at least one (e.g., two) selected from general formula I-1-1, general formula I-1-2, general formula I-1-3, general formula I-2-1, general formula I-2-2, general formula I-2-3, general formula I-4-1, general formula I-4-2, general formula I-4-3, general formula I-10-1, general formula I-10-2, general formula I-10-3, and general formula I-10-3. The compounds of general formula I, which constitute the group consisting of compounds of general formula I-11-1, compounds of general formula I-11-2, and compounds of general formula I-11-3, account for 1%-25% by weight of the liquid crystal composition, for example, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 8.5%, 9%, 9.5%, 10%, 10.5%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, etc.

[0044] In some embodiments of the present invention, the compound of general formula F accounts for 1%-30% by weight of the liquid crystal composition, for example 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 8.5%, 9%, 9.5%, 10%, 10.5%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, or 30%, preferably 5%-20%, and more preferably 7-16%.

[0045] In some embodiments of the present invention, compounds of general formula F are selected from the group consisting of:

[0046]

[0047]

[0048]

[0049]

[0050] as well as

[0051]

[0052] Among them, R F1 and R F2Each of the following independently represents -H, halogen, or a straight-chain or branched alkyl group containing 1-10 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10) carbon atoms, wherein one or more of the -CH2- in the straight-chain or branched alkyl group containing 1-10 carbon atoms can be independently replaced by -C≡C-, -O-, -S-, -CO-, -CO-O-, or -O-CO-, and one or more of the -H in the straight-chain or branched alkyl group containing 1-10 carbon atoms can be independently replaced by -F or -Cl;

[0053] Z F1 This indicates single bonds, -O-, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-,

[0054] -CF2CF2-, -(CH2)4-, -CF2O- or -OCF2-;

[0055] R F2 'Indicates a straight-chain or branched alkoxy group containing 1-11 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or 11) carbon atoms;

[0056] R F2 "" indicates a straight-chain or branched alkyl group containing 1-10 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10) carbon atoms;

[0057] X F1 and X F2 Each can be represented independently as -CH2- or -O-;

[0058] n F3 Representing integers from 1 to 5; and

[0059] R F3 It refers to a straight-chain or branched alkyl group containing 1-5 (e.g., 1, 2, 3, 4 or 5) carbon atoms, a straight-chain or branched alkoxy group containing 1-4 (e.g., 1, 2, 3 or 4) carbon atoms, or a straight-chain or branched alkenyl group containing 2-5 (e.g., 2, 3, 4 or 5) carbon atoms.

[0060] In some embodiments of the present invention, the compound of general formula F comprises at least one (e.g., two or three) compound selected from the group consisting of compounds of general formula F-1, general formula F-3, general formula F-4, general formula F-5, general formula F-32, general formula F-33, general formula F-36, general formula F-37, general formula F-38, general formula F-39, general formula F-40, general formula F-41, general formula F-46, general formula F-47, general formula F-48, and general formula F-49.

[0061] In some embodiments of the present invention, the compound of general formula F comprises at least one (e.g., two, three) compound selected from the group consisting of compounds of general formula F-1, general formula F-3, general formula F-4, general formula F-5, general formula F-32, general formula F-33, general formula F-37, general formula F-39, general formula F-40, general formula F-46, and general formula F-49.

[0062] In some embodiments of the present invention, the compound of general formula F, selected from the group consisting of compounds of general formula F-1, general formula F-3, general formula F-4, general formula F-5, general formula F-32, general formula F-33, general formula F-37, general formula F-39, general formula F-40, general formula F-46, and general formula F-49, accounts for 1%-25% by weight of the liquid crystal composition, for example, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 8.5%, 9%, 9.5%, 10%, 10.5%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, etc.

[0063] The alkenyl group in this invention is preferably selected from any group represented by formula (V1) to (V9), and particularly preferably formula (V1), formula (V2), formula (V8), or formula (V9). The groups represented by formulas (V1) to (V9) are shown below:

[0064]

[0065] In this context, * represents a carbon atom in the bonded ring structure.

[0066] 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:

[0067]

[0068] Among them, R M1 and R M2 Each independently represents a straight-chain or branched alkyl group containing 1-12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms. One or more non-adjacent -CH2- in the straight-chain or branched alkyl group containing 1-12 carbon atoms can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-;

[0069] ring ring and ring Each represents independently in At most one -CH2- can be replaced by -O-, and in at most two non-adjacent rings, a single bond can be replaced by a double bond. At most one -H in the halogen can be replaced by a halogen;

[0070] Z M1 and Z M2 Each can independently represent a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -CH2CH2-, or -(CH2)4-; and

[0071] n M Represents 0, 1, or 2, where when n M When = 2, ring They can be the same or different, Z M2 They can be the same or different.

[0072] In some embodiments of the present invention, the compound of general formula M accounts for 1%-70% by weight of the liquid crystal composition, for example 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17.5%, 18%, 19%, 20%, 21%, 21.5%, 22%, 23%, 24%, 26%, 27%, 27.5%, 28.5%. The percentages are 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37.5%, 38%, 38.5%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 48%, 49%, 50%, 52%, 54%, 56%, 58%, 60%, 62%, 64%, 67%, 68%, 70%, etc., preferably 10%-60%, and more preferably 20-50%.

[0073] In some embodiments of the present invention, compounds of general formula M are selected from the group consisting of:

[0074]

[0075]

[0076]

[0077]

[0078]

[0079] as well as

[0080]

[0081] Among them, R M1 and R M2 Each of the following independently represents a straight-chain or branched alkyl group containing 1-10 carbon atoms, wherein one or more non-adjacent -CH2- groups of the straight-chain or branched alkyl group containing 1-10 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-.

[0082] In some embodiments of the present invention, R M1 and R M2 Each of these terms independently represents a straight-chain or branched alkyl group containing 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a straight-chain or branched alkoxy group containing 1 to 7 (e.g., 1, 2, 3, 4, 5, 6, or 7) carbon atoms, or a straight-chain or branched alkenyl group containing 2 to 8 (e.g., 2, 3, 4, 5, 6, 7, or 8) carbon atoms.

[0083] In some embodiments of the present invention, the compound of general formula M comprises at least one (e.g., two, three, four, or five) compound selected from the group consisting of compounds of general formula M-1, general formula M-5, general formula M-14, general formula M-22, general formula M-30, general formula M-34, and general formula M-51.

[0084] In some embodiments of the present invention, compounds of general formula M contain at least one (e.g., two, three, or four) R. M1 Or R M2 This refers to the group of compounds of general formula M-1, general formula M-22, general formula M-30, and general formula M-34 containing straight-chain alkenyl groups with 2 to 8 carbon atoms.

[0085] In some embodiments of the present invention, the liquid crystal composition of the present invention further comprises at least one compound of general formula N:

[0086]

[0087] Among them, R N1 and R N2 Each independently represents a straight-chain or branched alkyl group containing 1-12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms. One or more non-adjacent -CH2- in the straight-chain or branched alkyl group containing 1-12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-;

[0088] ring and ring Each represents independently in One or more non-adjacent -CH2- bonds can be replaced by -O- bonds, and at most two non-adjacent single bonds in one ring can be replaced by double bonds. One or more -H can be independently replaced by -F, -Cl or -CN, and -CH= in one or more rings can be replaced by -N=;

[0089] Z N1 and Z N2 Each can independently represent a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, -CF2CF2-, -(CH2)4-, -CF2O-, or -OCF2-;

[0090] L N1 and L N2 Each independently represents -H, halogen, alkyl group containing 1-3 (e.g., 1, 2, or 3) carbon atoms, or alkoxy group containing 1-3 (e.g., 1, 2, or 3) carbon atoms; and

[0091] n N1 n represents 0, 1, 2, or 3. N2 Represents 0 or 1, and 0 ≤ n N1 +n N2 ≤3, when n N1 When = 2 or 3, the ring They can be the same or different, Z N1 They can be the same or different.

[0092] In some embodiments of the present invention, the compound of general formula N accounts for 1%-80% by weight of the liquid crystal composition, for example 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17.5%, 18%, 19%, 20%, 21%, 21.5%, 22%, 23%, 24%, 26%, 27%, 27.5%, 28.5%, 30%, 31%, 32%, and 33%. The percentages are 34%, 35%, 36%, 37.5%, 38%, 38.5%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47.5%, 48%, 49%, 50%, 52%, 54%, 56%, 58%, 59.5%, 60%, 62%, 64%, 67%, 68%, 70%, 72%, 74%, 76%, 77%, 78%, 80%, etc., preferably 20%-70%, and more preferably 30-65%.

[0093] In some embodiments of the present invention, compounds of general formula N are selected from the group consisting of:

[0094]

[0095]

[0096]

[0097] as well as

[0098]

[0099] Among them, R N1 and R N2 Each of the above refers independently to a straight-chain or branched alkyl group containing 1 to 10 carbon atoms, wherein one or more non-adjacent -CH2- groups of the straight-chain or branched alkyl group containing 1 to 10 carbon atoms may be independently replaced by -CH=CH- or -O-.

[0100] In some embodiments of the present invention, R N1 and R N2 Each of these terms independently represents a straight-chain or branched alkyl group containing 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a straight-chain or branched alkoxy group containing 1 to 7 (e.g., 1, 2, 3, 4, 5, 6, or 7) carbon atoms, or a straight-chain or branched alkenyl group containing 2 to 8 (e.g., 2, 3, 4, 5, 6, 7, or 8) carbon atoms.

[0101] In some embodiments of the present invention, the compound of general formula N comprises at least one (e.g., two, three, four, five, six, seven, eight, nine, or ten) compound selected from the group consisting of compounds of general formula N-1, general formula N-2, general formula N-3, general formula N-5, general formula N-6, general formula N-7, general formula N-10, general formula N-11, general formula N-12, general formula N-25, general formula N-27, general formula N-37, general formula N-38, general formula N-39, general formula N-40, and general formula N-41.

[0102] In some embodiments of the present invention, the compound of general formula N comprises at least one (e.g., two, three, or four) compound selected from the group consisting of compounds of general formula N-25, general formula N-27, general formula N-37, general formula N-38, and general formula N-40.

[0103] In some embodiments of the present invention, at least one (e.g., two, three, four) compound of general formula N selected from the group consisting of compound of general formula N-25, compound of general formula N-27, compound of general formula N-37, compound of general formula N-38, and compound of general formula N-40 accounts for 1%-30% by weight of the liquid crystal composition, for example 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17.5%, 18%, 19%, 20%, 21%, 21.5%, 22%, 23%, 24%, 26%, 27%, 27.5%, 28.5%, 30%, etc.

[0104] In some embodiments of the present invention, the compound of general formula N contains at least one R. N1 Or R N2 This refers to compounds of general formula N-5, general formula N-11, or general formula N-25 containing straight-chain or branched alkenyl groups with 2 to 8 carbon atoms.

[0105] In some embodiments of the present invention, the compound of general formula N comprises at least one (e.g., two, three, or four) compound selected from the group consisting of compounds of general formula N-3, compounds of general formula N-6, and compounds of general formula N-7.

[0106] In some embodiments of the present invention, at least one (e.g., two, three, four) compound of general formula N selected from the group consisting of compounds of general formula N-3, compounds of general formula N-6, and compounds of general formula N-7 accounts for 1%-30% by weight of the liquid crystal composition, for example 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17.5%, 18%, 19%, 20%, 21%, 21.5%, 22%, 23%, 24%, 26%, 27%, 27.5%, 28.5%, 30%, etc.

[0107] In some embodiments of the present invention, the liquid crystal composition of the present invention further comprises at least one polymerizable compound of general formula RM:

[0108]

[0109] in,

[0110] ring and ring Each represents independently in One or more non-adjacent -CH2- bonds in one or more rings can be replaced by -O- bonds, and at most two non-adjacent single bonds in one or more rings can be replaced by double bonds. One or more -H atoms may be independently replaced by -F, -Cl, -CN, -Sp3-P3, a halo- or non-halogenated straight-chain alkyl group containing 1-12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, or a halo- or non-halogenated straight-chain alkoxy group containing 1-11 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or 11) carbon atoms. Substitution, and in one or more rings -CH= can be replaced by -N=;

[0111] ring express in One or more -H atoms may be independently replaced by -F, -Cl, -CN, -Sp3-P3, a halo- or non-halogenated straight-chain alkyl group containing 1-12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, or a halo- or non-halogenated straight-chain alkoxy group containing 1-11 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or 11) carbon atoms. Substitution, and in one or more rings -CH= can be replaced by -N=;

[0112] R RM Represents -H, halogen, -CN, -Sp2-P2, straight-chain or branched alkyl groups containing 1-12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms. Alkyl groups containing 1-12 carbon atoms, either straight-chain or branched. One or more non-adjacent -CH2- can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-, and one or more -H can be independently replaced by -F or -Cl;

[0113] P1, P2, and P3 each independently represent polymerizable groups;

[0114] Sp1, Sp2, and Sp3 each independently represent a spacer group or a single bond;

[0115] X0 represents -O-, -S-, or -CO-;

[0116] Z1 and Z2 independently represent -O-, -S-, -CO-, -CO-O-, -O-CO-, -O-CO-O-, -CH2O-, -OCH2-, -CH2S-, -SCH2-, -CF2O-, -OCF2-, -CF2S-, -SCF2-, and -(CH2). d -, -CF2CH2-, -CH2CF2-, -(CF2) d -, -CH=CH-, -CF=CF-, -CH=CF-, -CF=CH-, -C≡C-, -CH=CH-CO-O-, -O-CO-CH=CH-, -CH2CH2-CO-O-, -O-CO-CH2CH2-, -CHR 1 -、-CR 1 R 2 - or a single bond, where R 1 and R 2 Each of these independently represents a straight-chain or branched alkyl group containing 1-12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, and d represents an integer from 1 to 4 (e.g., 1, 2, 3, or 4); and

[0117] a represents 0, 1, or 2, b represents 0 or 1, where when a represents 2, the ring... They can be the same or different; Z1 can be the same or different.

[0118] In some embodiments of the present invention, the polymerizable compound of general formula RM is selected from the group consisting of the following compounds:

[0119]

[0120]

[0121]

[0122]

[0123] as well as

[0124]

[0125] The definitions of P1, P2, Sp1, Sp2, Z1, and Z2 are the same as those in the general formula RM;

[0126] X1-X 10 and X 12 Each can independently represent -F, -Cl, -Sp3-P3, or a straight-chain alkyl or alkoxy group containing 1-5 (e.g., 1, 2, 3, 4, or 5) carbon atoms.

[0127] In some embodiments of the present invention, Sp1 and Sp2 both represent single bonds.

[0128] The polymerizable groups involved in this invention are groups suitable for polymerization reactions (e.g., free radical or ionic polymerization, addition polymerization, or condensation polymerization), or groups suitable for addition or condensation on the polymer backbone. For chain polymerization, polymerizable groups containing -CH=CH- or -C≡C- are particularly preferred; for ring-opening polymerization, oxetyl or epoxy groups are particularly preferred, for example.

[0129] In some embodiments of the present invention, polymerizable groups P1, P2, and P3 are each independently represented. Or -SH; preferably, the polymerizable groups P1, P2, and P3 are each represented independently. Or -SH; more preferably, the polymerizable groups P1, P2, and P3 are each independently represented.

[0130] As used herein, the term "spacer group" is known to those skilled in the art and is described in references (e.g., Pure Appl. Chem. 2001, 73(5), 888 and C. Tschierske, G. Pelzl, S. Diele, Angew. Chem. 2004, 116, 6340-6368). As used herein, the term "spacer group" refers to a flexible group that connects a mesocrystalline group and a polymerizable group in a polymerizable compound. Typical spacer groups include, for example, -(CH2)p1-, -(CH2CH2O)q1-CH2CH2-, -(CH2CH2S)q1-CH2CH2-, -(CH2CH2NH)q1-CH2CH2-, -CR 0 R 00 -(CH2) p1 -or-(SiR) 0 R 00 -O)p1-, where p1 represents an integer from 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12), q1 represents an integer from 1 to 3 (e.g., 1, 2, or 3), and R 0 and R 00 Each of the following can independently represent -H, a straight-chain or branched alkyl group containing 1-12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, or a cycloalkyl group containing 3-12 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms. Particularly preferred spacer groups are -(CH2)p1-, -(CH2)p1-O-, -(CH2)p1-O-CO-, -(CH2)p1-CO-O-, -(CH2)p1-O-CO-O-, or -CR. 0 R 00 -(CH2) p1 -

[0131] In some embodiments of the invention, the polymerizable compound of general formula RM accounts for 0.001%-5% (inclusive of any value or subrange within this range) of the weight percentage of the liquid crystal composition, for example, 0.001%, 0.002%, 0.004%, 0.005%, 0.006%, 0.008%, 0.01%, 0.02%, 0.04%, 0.06%, 0.08%, 0.1%. 0.2%, 0.25%, 0.26%, 0.27%, 0.28%, 0.29%, 0.3%, 0.32%, 0.33%, 0.34%, 0.35%, 0.4%, 0.5%, 0.6%, 0.8%, 1%, 1.2%, 1.6%, 1.8%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, or a range between any two of these values.

[0132] In some embodiments of the present invention, the liquid crystal composition of the present invention further comprises one or at least two of the following dopants:

[0133]

[0134]

[0135] as well as

[0136]

[0137] In addition to the compounds mentioned above, the liquid crystal compositions of the present invention may also contain conventional antioxidants, ultraviolet absorbers, infrared absorbers, photoinitiators, polymerizable monomers, or light stabilizers.

[0138] Furthermore, the antioxidants, light stabilizers, and other additives used in the liquid crystal composition of the present invention are preferably the following substances:

[0139]

[0140]

[0141]

[0142] Where n represents a positive integer from 1 to 12.

[0143] Preferably, the light stabilizer is selected from the following compounds:

[0144]

[0145] In some embodiments of the present invention, the additive accounts for 0%-5% of the total weight percentage of the liquid crystal composition, for example, 0.1%, 0.5%, 0.8%, 1%, 2%, 3%, 4%, 5%, etc.; preferably, the additive accounts for 0.01%-1% of the total weight percentage of the liquid crystal composition.

[0146] In some embodiments of the present invention, the liquid crystal composition of the present invention further comprises a photoinitiator as shown below:

[0147]

[0148] In a second aspect, the present invention provides a liquid crystal display device comprising the liquid crystal composition as described in the first aspect.

[0149] In some embodiments of the present invention, the liquid crystal display device is an IPS type, an NFFS type, or a VA type.

[0150] Compared with the prior art, the present invention has at least the following beneficial effects:

[0151] This invention, through the combination of compounds of general formula I and general formula F, enables the composition to have a large K value, high contrast, low flicker, and long low-temperature storage time, thereby enabling liquid crystal display devices containing the liquid crystal composition of this invention to have high contrast and fast response speed. Detailed Implementation

[0152] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0153] For ease of explanation, in the following embodiments, the group structures of the liquid crystal compositions are represented by the codes listed in Table 1:

[0154] Table 1. Structure codes of compound groups in liquid crystal compositions.

[0155]

[0156]

[0157] Take the following compound with the following structural formula as an example:

[0158]

[0159] If the structural formula is represented by the codes listed in Table 1, it can be expressed as: nCCGF, where n in the code represents the number of C atoms in the alkyl group at the left end. For example, if n is "3", it means that the alkyl group is -C3H7. In the code, C represents 1,4-cyclohexylene, G represents 2-fluoro-1,4-phenyleneene, and F represents fluorine.

[0160] In the following embodiments, the abbreviated codes for performance test items are shown in Table 2.

[0161] Table 2 Abbreviated Codes for Performance Test Items

[0162] Test Project Code meaning Δn Optical anisotropy (589nm, 25℃) Cp Clearing point (nematic-isotropic phase transition temperature, °C) Δε Dielectric anisotropy (1kHz, 25℃) <![CDATA[K 11 ,K 33 ]]> Flexural elastic constant / Bending elastic constant (25℃) γ1 Rotational viscosity (mPa·s, 25℃) CR Contrast ratio (bright state transmittance / dark state transmittance, 25℃) Flicker (Flicker value of the LCD screen) LTS (-30℃) Low-temperature storage stability (h)

[0163] in,

[0164] Δn: Δn = n e -n0 was obtained by measuring with an Abbe refractometer under a sodium lamp (589nm) light source at 25°C.

[0165] Cp: ​​Measured using an MP70 melting point apparatus.

[0166] Δε: Δε = ε ∥ -ε ⊥ , where ε∥ ε is the dielectric constant parallel to the molecular axis. ⊥ The dielectric constant is perpendicular to the molecular axis; test conditions: 25℃, 1KHz, VA type test box with a thickness of 6μm.

[0167] K 11 and K 33 The CV curve of the liquid crystal was calculated using an LCR meter and a VA test box. Test conditions: 6μm VA type test box, V = 0.1~20V.

[0168] γ1: Measured using the LCM-2 type liquid crystal property evaluation system; test conditions: 25℃, 160-240V, test cell thickness 20μm.

[0169] CR: The transmittance of the liquid crystal cell was measured using a DMS 505 tester at 255 grayscale voltage and 0 grayscale voltage, respectively, i.e., T. r255 and T r0 , by T r255 / T r0 The test conditions were: 25℃ and 3μm thick negative FFS test box.

[0170] Flicker value: Tested using a DMS505 tester in Flicker mode, and the logarithm of the test value was obtained. Test conditions: 25℃, 60HZ, V22 voltage drive, negative FFS type test box with a box thickness of 3μm.

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

[0172] All components used in the liquid crystal compositions of the following embodiments can be synthesized by known methods or obtained commercially, and the components of the resulting liquid crystal compositions have been tested and found to meet the standards for electronic compounds.

[0173] The liquid crystal compositions in the following examples are prepared by mixing according to the proportions of each component (the parentheses at the end of each component in each example are the general formulas for the components) and by conventional preparation methods such as heating, ultrasonication, suspension, etc.

[0174] Example 1

[0175] In this embodiment, the liquid crystal composition comprises components in the following table by mass percentage, and its performance test results are listed in the table below:

[0176]

[0177] Comparative Example 1

[0178] In this comparative example, the liquid crystal composition comprises the components in the following table by mass percentage, and its performance test results are listed in the table below:

[0179]

[0180] Comparative Example 2

[0181] In this comparative example, the liquid crystal composition comprises the components in the following table by mass percentage, and its performance test results are listed in the table below:

[0182]

[0183]

[0184] As can be seen from the comparison of Comparative Example 1, Comparative Example 2 and Example 1, the liquid crystal composition of the present invention, through the optimization of the structure of each component, enables the liquid crystal composition of the present invention to have a larger K value, higher contrast, lower flicker, and a comparable or longer low-temperature storage time.

[0185] Example 2

[0186] In this embodiment, the liquid crystal composition comprises components in the following table by mass percentage, and its performance test results are listed in the table below:

[0187]

[0188] Example 3

[0189] In this embodiment, the liquid crystal composition comprises components in the following table by mass percentage, and its performance test results are listed in the table below:

[0190]

[0191] Example 4

[0192] In this embodiment, the liquid crystal composition comprises components in the following table by mass percentage, and its performance test results are listed in the table below:

[0193]

[0194]

[0195] Example 5

[0196] In this embodiment, the liquid crystal composition comprises components in the following table by mass percentage, and its performance test results are listed in the table below:

[0197]

[0198] Example 6

[0199] In this embodiment, the liquid crystal composition comprises components in the following table by mass percentage, and its performance test results are listed in the table below:

[0200]

[0201] Example 7

[0202] In this embodiment, the liquid crystal composition comprises components in the following table by mass percentage, and its performance test results are listed in the table below:

[0203]

[0204] Example 8

[0205] In this embodiment, the liquid crystal composition comprises components in the following table by mass percentage, and its performance test results are listed in the table below:

[0206]

[0207] Example 9

[0208] In this embodiment, the liquid crystal composition comprises components in the following table by mass percentage, and its performance test results are listed in the table below:

[0209]

[0210]

[0211] In summary, the liquid crystal composition of the present invention has a large K value, high contrast, low flicker, and long low-temperature storage time, which makes the liquid crystal display device containing the liquid crystal composition of the present invention have high contrast and fast response speed.

[0212] The applicant declares that the present invention is illustrated by the above embodiments to demonstrate the liquid crystal composition and liquid crystal display device of the present invention, 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 improvements to the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A liquid crystal composition, characterized in that, The liquid crystal composition comprises: At least one compound of general formula I: as well as At least one compound of general formula F: Wherein, R1 and R2 independently represent -H, a straight-chain or branched alkyl group containing 1-12 carbon atoms, In the alkyl group containing 1-12 carbon atoms, one or more of the -CH2- groups (either straight-chain or branched) can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-, and in the alkyl group containing 1-12 carbon atoms, one or more of the -H groups (either straight-chain or branched) can be independently replaced by -F. ring ring Each represents independently At least one ring or ring express ring ring Each represents independently n1 is either 0 or 1; R F1 and R F2 Each can independently represent -H, halogen, or straight-chain or branched alkyl groups containing 1-12 carbon atoms. The alkyl group containing 1-12 carbon atoms, whether straight-chain or branched, One or more non-adjacent -CH2- can be independently replaced by -CH=CH-, -C≡C-, -O-, -S-, -CO-, -CO-O- or -O-CO-, and one or more -H in the straight-chain or branched alkyl group containing 1-12 carbon atoms can be independently replaced by -F or -Cl. ring and ring Each represents independently in One or more non-adjacent -CH2- bonds in one or more rings can be replaced by -O- bonds, and at most two non-adjacent single bonds in one or more rings can be replaced by double bonds. One or more -H can be independently replaced by -CN, -F or -Cl, and -CH= in one or more rings can be replaced by -N=; X F Indicates -O-, -S-, or -CO-; L F1 and L F2 Each can be independently represented as -H, -F, -Cl, -CF3, or -OCF3; Z F1 and Z F2 Each can independently represent a single bond, -O-, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -(CH2)2O-, -O(CH2)2-, -CH=CH-, -C≡C-, -CH2CH2-, -CF2CF2-, -(CH2)3-, -(CH2)4-, -CF2O-, or -OCF2-; n F1 and n F2 Each can be independently represented as 0, 1, or 2, where when n F1 When 2 is represented, the ring They can be the same or different, where when n F2 When 2 is represented, the ring They can be the same or different, Z F2 They can be the same or different; and n F4 Represents integers from 0 to 4.

2. The liquid crystal composition according to claim 1, characterized in that, The compound of general formula I accounts for 1%-30% of the weight of the liquid crystal composition, preferably 3%-15%, and more preferably 5%-12%; Preferably, the compound of general formula I is selected from the group consisting of: as well as Wherein, R1 and R2 each independently represent a straight-chain or branched alkyl group containing 1-10 carbon atoms, wherein one or more non-adjacent -CH2- of the straight-chain or branched alkyl group containing 1-10 carbon atoms can be independently replaced by -CH=CH- or -O-. Preferably, R1 and R2 each independently represent a straight-chain or branched alkyl group containing 1-10 carbon atoms, a straight-chain or branched alkoxy group containing 1-9 carbon atoms, or a straight-chain or branched alkenyl group containing 2-9 carbon atoms. Preferably, the compound of general formula I comprises at least one compound selected from the group consisting of compounds of general formula I-1, general formula I-2, general formula I-4, general formula I-10, and general formula I-11. Preferably, the compound of general formula I comprises at least one compound selected from the group consisting of compounds of general formula I-1-1, general formula I-1-2, general formula I-1-3, general formula I-2-1, general formula I-2-2, general formula I-2-3, general formula I-4-1, general formula I-4-2, general formula I-4-3, general formula I-10-1, general formula I-10-2, general formula I-10-3, general formula I-11-1, general formula I-11-2, and general formula I-11-3. as well as in, R 21 It refers to a straight-chain or branched alkyl group containing 1-8 carbon atoms; and R 22 It represents a straight-chain or branched alkenyl group containing 2-8 carbon atoms; Preferably, the compound of general formula I, comprising at least one compound selected from the group consisting of general formula I-1-1, general formula I-1-2, general formula I-1-3, general formula I-2-1, general formula I-2-2, general formula I-2-3, general formula I-4-1, general formula I-4-2, general formula I-4-3, general formula I-10-1, general formula I-10-2, general formula I-10-3, general formula I-11-1, general formula I-11-2, and general formula I-11-3, accounts for 1%-25% by weight of the liquid crystal composition.

3. The liquid crystal composition according to claim 1 or 2, characterized in that, The compound of general formula F accounts for 1%-30% of the weight percentage of the liquid crystal composition, preferably 5%-20%, and more preferably 7-16%; Preferably, the compound of general formula F is selected from the group consisting of: as well as Among them, R F1 and R F2 Each of the following can independently represent -H, halogen, or a straight-chain or branched alkyl group containing 1-10 carbon atoms, wherein one or more of the -CH2- groups of the straight-chain or branched alkyl group containing 1-10 carbon atoms can be independently replaced by -C≡C-, -O-, -S-, -CO-, -CO-O-, or -O-CO-, and one or more of the -H groups of the straight-chain or branched alkyl group containing 1-10 carbon atoms can be independently replaced by -F or -Cl; Z F1 This indicates single bonds, -O-, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, -CF2CF2-, -(CH2)4-, -CF2O- or -OCF2-; R F2 'Indicates a straight-chain or branched alkoxy group containing 1-11 carbon atoms; R F2 "Indicates a straight-chain or branched alkyl group containing 1-10 carbon atoms; X F1 and X F2 Each can be represented independently as -CH2- or -O-; n F3 Representing integers from 1 to 5; and R F3 It refers to a straight-chain or branched alkyl group containing 1-5 carbon atoms, a straight-chain or branched alkoxy group containing 1-4 carbon atoms, or a straight-chain or branched alkenyl group containing 2-5 carbon atoms. Preferably, the compound of general formula F comprises at least one compound selected from the group consisting of compounds of general formula F-1, general formula F-3, general formula F-4, general formula F-5, general formula F-32, general formula F-33, general formula F-36, general formula F-37, general formula F-38, general formula F-39, general formula F-40, general formula F-41, general formula F-46, general formula F-47, general formula F-48, and general formula F-49. Preferably, the compound of general formula F comprises at least one compound selected from the group consisting of compounds of general formula F-1, general formula F-3, general formula F-4, general formula F-5, general formula F-32, general formula F-33, general formula F-37, general formula F-39, general formula F-40, general formula F-46, and general formula F-49. Preferably, the compound of general formula F, selected from the group consisting of compounds of general formula F-1, general formula F-3, general formula F-4, general formula F-5, general formula F-32, general formula F-33, general formula F-37, general formula F-39, general formula F-40, general formula F-46, and general formula F-49, accounts for 1%-25% by weight of the liquid crystal composition.

4. The liquid crystal composition according to any one of claims 1-3, characterized in that, The liquid crystal composition further comprises at least one compound of general formula M: Among them, R M1 and R M2 Each independently represents a straight-chain or branched alkyl group containing 1-12 carbon atoms. One or more non-adjacent -CH2- in the straight-chain or branched alkyl group containing 1-12 carbon atoms can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-; ring ring and ring Each represents independently in At most one -CH2- can be replaced by -O-, and in at most two non-adjacent rings, a single bond can be replaced by a double bond. At most one -H in the halogen can be replaced by a halogen; Z M1 and Z M2 Each can independently represent a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -CH2CH2-, or -(CH2)4-; and n M Represents 0, 1, or 2, where when n M When = 2, ring They can be the same or different, Z M2 They can be the same or different.

5. The liquid crystal composition according to claim 4, characterized in that, The compound of general formula M accounts for 1%-70% of the weight percentage of the liquid crystal composition, preferably 10%-60%, and more preferably 20-50%. Preferably, the compound of general formula M is selected from the group consisting of: as well as Among them, R M1 and R M2 Each of the following independently represents a straight-chain or branched alkyl group containing 1-10 carbon atoms, wherein one or more non-adjacent -CH2- groups of the straight-chain or branched alkyl group containing 1-10 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-. Preferably, R M1 and R M2 Each can be independently represented as a straight-chain or branched alkyl group containing 1-8 carbon atoms, a straight-chain or branched alkoxy group containing 1-7 carbon atoms, or a straight-chain or branched alkenyl group containing 2-8 carbon atoms. Preferably, the compound of general formula M comprises at least one compound selected from the group consisting of compounds of general formula M-1, general formula M-5, general formula M-14, general formula M-22, general formula M-30, general formula M-34, and general formula M-51. Preferably, the compound of general formula M contains at least one R. M1 Or R M2 This refers to the group of compounds of general formula M-1, general formula M-22, general formula M-30, and general formula M-34 containing straight-chain alkenyl groups with 2 to 8 carbon atoms.

6. The liquid crystal composition according to any one of claims 1-5, characterized in that, The liquid crystal composition further comprises at least one compound of the general formula N: Among them, R N1 and R N2 Each independently represents a straight-chain or branched alkyl group containing 1-12 carbon atoms. One or more non-adjacent -CH2- in the straight-chain or branched alkyl group containing 1-12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-; ring and ring Each represents independently in One or more non-adjacent -CH2- bonds can be replaced by -O- bonds, and at most two non-adjacent single bonds in one ring can be replaced by double bonds. One or more -H can be independently replaced by -F, -Cl or -CN, and -CH= in one or more rings can be replaced by -N=; Z N1 and Z N2 Each can independently represent 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 can independently represent -H, halogen, alkyl group containing 1-3 carbon atoms, or alkoxy group containing 1-3 carbon atoms; and n N1 n represents 0, 1, 2, or 3. N2 Represents 0 or 1, and 0 ≤ n N1 +n N2 ≤3, when n N1 When = 2 or 3, the ring They can be the same or different, Z N1 They can be the same or different.

7. The liquid crystal composition according to claim 6, characterized in that, The compound of general formula N accounts for 1%-80% of the weight percentage of the liquid crystal composition, preferably 20%-70%, and more preferably 30%-65%.

8. The liquid crystal composition according to claim 6 or 7, characterized in that, The compounds of general formula N are selected from the group consisting of the following compounds: as well as Among them, R N1 and R N2 Each of the above independently represents a straight-chain or branched alkyl group containing 1 to 10 carbon atoms, wherein one or more non-adjacent -CH2- of the straight-chain or branched alkyl group containing 1 to 10 carbon atoms may be independently replaced by -CH=CH- or -O-. Preferably, R N1 and R N2 Each can be independently represented as a straight-chain or branched alkyl group containing 1-8 carbon atoms, a straight-chain or branched alkoxy group containing 1-7 carbon atoms, or a straight-chain or branched alkenyl group containing 2-8 carbon atoms. Preferably, the compound of general formula N comprises at least one compound selected from the group consisting of compounds of general formula N-1, general formula N-2, general formula N-3, general formula N-5, general formula N-6, general formula N-7, general formula N-10, general formula N-11, general formula N-12, general formula N-25, general formula N-27, general formula N-37, general formula N-38, general formula N-39, general formula N-40, and general formula N-41. Preferably, the compound of general formula N comprises at least one compound selected from the group consisting of compounds of general formula N-25, general formula N-27, general formula N-37, general formula N-38, and general formula N-40. Preferably, the at least one compound of general formula N selected from the group consisting of compounds of general formula N-25, general formula N-27, general formula N-37, general formula N-38, and general formula N-40 accounts for 1%-30% of the weight percentage of the liquid crystal composition. Preferably, the compound of general formula N contains at least one R. N1 Or R N2 This refers to compounds of general formula N-5, general formula N-11, or general formula N-25 containing straight-chain or branched alkenyl groups with 2 to 8 carbon atoms. Preferably, the compound of general formula N comprises at least one compound selected from the group consisting of compounds of general formula N-3, compounds of general formula N-6, and compounds of general formula N-7; Preferably, the at least one compound of general formula N selected from the group consisting of compounds of general formula N-3, compounds of general formula N-6, and compounds of general formula N-7 accounts for 1%-30% of the weight percentage of the liquid crystal composition.

9. A liquid crystal display device, characterized in that, The liquid crystal display device comprises the liquid crystal composition as described in any one of claims 1-8.

10. The liquid crystal display device according to claim 9, characterized in that, The liquid crystal display device can be IPS, NFFS, or VA type.

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