A liquid crystal composition and a liquid crystal display device comprising the same

Abstract

This invention provides a liquid crystal composition and a liquid crystal display device comprising the same. The liquid crystal composition comprises at least one compound of general formula I containing a side methyl or side ethyl structure, at least one compound of general formula II, and at least one compound of general formula III containing a cyano terminal group. The liquid crystal composition provided by this invention can effectively improve low-temperature miscibility, reduce dielectric loss of liquid crystal at high frequencies, and increase tunability of liquid crystal at high frequencies.

Description

Technical Field

[0001] This invention relates to the field of liquid crystal materials technology, and more specifically to a liquid crystal composition and a liquid crystal display device comprising the same. Background Technology

[0002] With the rapid development of modern communication technology, frequency congestion has become increasingly prominent. Solving this problem requires communication devices to have higher frequency tunability, wider bandwidth, and greater versatility. Existing ferroelectric microwave devices made of metals are no longer sufficient to meet the needs of modern communication development due to their large size, small capacity, slow tuning speed, complex manufacturing process, and high cost. In the past two decades, research has focused on low-voltage, fast-tuning, wide-bandwidth, miniaturized, and portable microwave communication devices to overcome these shortcomings and promote the upgrading of communication technology; this is also a common pursuit of communication terminal platforms in military, vehicle-mounted, shipborne, airborne, and aviation applications.

[0003] Research by Merck in Germany shows that various liquid crystal materials with optical anisotropy (i.e., birefringence) greater than 0.3 have been developed to date. However, existing technologies using K15 or E7 have Δn values ​​below 0.2, very small Δεr values ​​at high frequencies, high dielectric loss, and problems such as excessively thick LC cells (d = 254 μm) and response times exceeding 350 ms. Merck's GT3-23001 liquid crystal has a Δn value of around 0.3, a Δεr reaching 0.8 at high frequencies, significantly reduced dielectric loss, and increased phase shift. In recent years, Merck has reported high Δn value mixed liquid crystal materials based on isothiocyanate-polycyclic aromatic acetylene groups, with Δn values ​​reaching around 0.35–0.38, which improves the dielectric properties of microwave devices, but dielectric loss remains relatively high. In 2018, Kowerdziej R. et al. reported the temperature-dependent optical tunability of fluorinated diphenylacetylene isothiocyanate-based liquid crystal assemblies in the 6 GHz band. They found that the microwave phase tunability (τ) and dielectric properties of these liquid crystals did not change significantly with temperature, indicating that the isothiocyanate and acetylene-based structural units are relatively stable to microwaves. Recently, Lapanik V. et al., building on Kowerdziej R.'s work, used isothiocyanate-polyaromatic ring mixed liquid crystal materials, which reduced dielectric loss and increased microwave phase shift, but the melting point of their liquid crystal materials was still above 0°C. To date, liquid crystals that can withstand extreme low temperatures, have a wide operating temperature range, low dielectric loss at the microwave end, high tunability, and excellent performance in all aspects remain extremely rare. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a liquid crystal composition with a high refractive index and a liquid crystal display device comprising the same. The liquid crystal composition of the present invention, while maintaining a high clearing point, large optical anisotropy, and large dielectric anisotropy, can also effectively improve low-temperature miscibility, reduce dielectric loss of the liquid crystal at high frequencies, and increase the tunability of the liquid crystal at high frequencies, making it suitable for high-frequency components.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] In a first aspect, the present invention provides a liquid crystal composition comprising at least one (e.g., two, three, or four) compounds of general formula I, at least one (e.g., two, three, or four) compounds of general formula II, and at least one (e.g., two, three, or four) compounds of general formula III:

[0007] as well as

[0008] Wherein, R1 represents a straight-chain or branched alkyl group containing 1-12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12) carbon atoms. One or at least two non-adjacent -CH2- groups of the straight-chain or branched alkyl group containing 1-12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12) carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-;

[0009] R2 is represented as -NCS;

[0010] R3 indicates a straight-chain or branched alkyl group containing 1-12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12) carbon atoms. One or at least two non-adjacent -CH2- groups of the straight-chain or branched alkyl group containing 1-12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12) carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-;

[0011] R4 is represented as -NCS;

[0012] R5 indicates a straight-chain or branched alkyl group containing 1-12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12) carbon atoms. One or at least two non-adjacent -CH2- groups of the straight-chain or branched alkyl group containing 1-12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12) carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-;

[0013] ring ring or ring Whether they are the same or different, they are expressed independently. Among them rings One or more -CH2- bonds can be replaced by -O- bonds, and one or more single bonds in a ring can be replaced by double bonds;

[0014] ring ring or ring Whether they are the same or different, they are expressed independently. Among them rings One or more -CH2- bonds can be replaced by -O- bonds, and one or more single bonds in a ring can be replaced by double bonds;

[0015] ring ring Whether they are the same or different, they are expressed independently. Among them rings One or more -CH2- bonds can be replaced by -O- bonds, and one or more single bonds in a ring can be replaced by double bonds;

[0016] X1~X 12 The same or different, each independently representing H, halogen, alkyl group containing 1-3 carbon atoms, alkoxy group containing 1-3 (e.g., 1, 2, 3) carbon atoms; X1~X 12 At least one of them represents methyl or ethyl;

[0017] X 13 ~X 24 Each can independently represent H, halogen, or alkoxy group containing 1-3 (e.g., 1, 2, 3) carbon atoms;

[0018] X 25 ~X 28 Each can be independently represented as H, halogen, alkyl group containing 1-3 (e.g., 1, 2, 3) carbon atoms, or alkoxy group containing 1-3 (e.g., 1, 2, 3) carbon atoms;

[0019] Z1 and Z2 independently represent single bonds, -O-, -S-, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, -CF2CF2-, -(CH2)4-, -CF2O-, or -OCF2-;

[0020] Z3 and Z4 independently represent single bonds, -O-, -S-, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, -CF2CF2-, -(CH2)4-, -CF2O-, or -OCF2-;

[0021] Z5 represents a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, -CF2CF2-, -(CH2)4-, -CF2O-, or -OCF2-;

[0022] n represents 0, 1, 2, m represents 0, 1, 2, and 1 represents 1, 2. When n = 2, Whether the same or different, for example, one can be... The other is

[0023] When m = 2 Whether the same or different, for example, one can be... The other is

[0024] When 1 = 2, Whether the same or different, for example, one can be... The other is

[0025] p represents 0, 1, 2, q represents 0, 1, 2, e represents 1, 2, when p = 2, Same or different, for example, one can be The other is

[0026] When q = 2 Same or different, for example, one can be The other is

[0027] When e = 2 Same or different, for example, one can be The other is

[0028] f represents 0, 1, 2, and h represents 1, 2. When f = 2, Same or different, for example, one can be The other is

[0029] When h = 2, Same or different, for example, one can be The other is Z5 is the same as or different from Z5.

[0030] In this invention, the 1-12 carbon atoms can be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12 carbon atoms.

[0031] In this invention, short straight lines on one or both sides of a group structure represent an access bond, not a methyl group, for example... The short straight line on the left, The short straight lines on both sides represent the connecting bonds that connect to the main structure of the compound.

[0032] In this invention, the halogen includes halogen elements such as fluorine, chlorine, bromine, or iodine; the same descriptions used below have the same meaning.

[0033] The following are preferred technical solutions of the present invention, but are not intended to limit the technical solutions provided by the present invention. The purpose and beneficial effects of the present invention can be better achieved and realized through the following preferred technical solutions.

[0034] In some embodiments of the present invention, the compound of general formula I is selected from the group consisting of the following compounds:

[0035]

[0036] as well as

[0037]

[0038] In some embodiments of the invention, R1 represents an alkyl or alkoxy group containing 1-10 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10) carbon atoms. R1 is further preferably an alkyl group containing 2-5 (e.g., 2, 3, 4, 5) carbon atoms.

[0039] In some embodiments of the present invention, X6, X7, X 10 X 11 The same or different, each independently representing -H, halogen, alkyl group containing 1-3 carbon atoms, alkoxy group containing 1-3 carbon atoms; X6, X7, X 10 X 11 At least one of them is methyl or ethyl. X6, X7, X 10 X11 Further preferred are -H, -F, alkyl groups containing 1-3 carbon atoms, and alkoxy groups containing 1-3 carbon atoms, respectively; X6, X7, X 10 X 11 At least one of them is methyl or ethyl.

[0040] In some embodiments of the present invention, in order to enable the liquid crystal composition containing it to effectively improve low-temperature miscibility, reduce dielectric loss of the liquid crystal at high frequencies, and increase the tunability of the liquid crystal at high frequencies, the compound of general formula I comprises at least one (e.g., one, two, three, four, or five) compound selected from the group consisting of compounds of general formula I-1, general formula I-2, general formula I-3, general formula I-4, general formula I-5, general formula I-6, and general formula I-7.

[0041] In some embodiments of the present invention, the compound of general formula I is selected from the group consisting of the following compounds:

[0042]

[0043]

[0044]

[0045]

[0046] as well as

[0047]

[0048] In some embodiments of the invention, R1 represents an alkyl or alkoxy group containing 1-10 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10) carbon atoms. R1 is further preferably an alkyl group containing 2-5 (e.g., 2, 3, 4, 5) carbon atoms.

[0049] In some embodiments of the present invention, in order to enable the liquid crystal composition containing it to effectively improve low-temperature miscibility, reduce dielectric loss of the liquid crystal at high frequencies, and increase the tunability of the liquid crystal at high frequencies, the compound of general formula I comprises at least one (e.g., one, two, three, four, or five) compound selected from the group consisting of the compound of general formula I-1-1, the compound of general formula I-1-4, the compound of general formula I-2-3, the compound of general formula I-2-6, the compound of general formula I-3-3, the compound of general formula I-3-6, the compound of general formula I-3-9, the compound of general formula I-3-12, the compound of general formula I-4-6, the compound of general formula I-5-3, the compound of general formula I-6-3, the compound of general formula I-6-6, the compound of general formula I-7-1, and the compound of general formula I-7-3.

[0050] In some embodiments of the present invention, it is preferable to adjust the content of the compound of general formula I so that the liquid crystal composition containing it can effectively improve low-temperature miscibility, reduce the dielectric loss of the liquid crystal at high frequencies, and increase the tunability of the liquid crystal at high frequencies.

[0051] In some embodiments of the present invention, the compound of general formula I accounts for 0.1%-70% (inclusive of any value or subrange within this range) of the weight percentage of the liquid crystal composition, for example, 0.1%, 0.5%, 1%, 2%, 3%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 13%, 14%, 16%, 17%, 19%, 20%, 22%, 23%, 24%, 25%, 26%. The percentages are 27%, 28%, 30%, 31%, 33%, 35%, 37%, 38%, 40%, 42%, 44%, 45%, 46%, 47%, 49%, 50%, 52%, 54%, 56%, 58%, 60%, 65%, 68%, 69%, 70%, or any two of these values. Preferably, the compound of general formula I accounts for 10%-68% of the weight percentage of the liquid crystal composition.

[0052] In some embodiments of the present invention, at least one (e.g., one, two, three, four, or five) compound selected from the group consisting of compounds of general formula I-1, general formula I-2, general formula I-3, general formula I-4, general formula I-5, general formula I-6, and general formula I-7 constitutes 10% to 65% (inclusive of any value or subrange within this range) of the weight percentage of the liquid crystal composition. For example, 10%, 12%, 13%, 14%, 16%, 17%, 19%, 20%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 30%, 31%, 33%, 35%, 37%, 38%, 40%, 42%, 44%, 45%, 46%, 47%, 49%, 50%, 52%, 54%, 56%, 58%, 60%, 65%, or a range between any two of these values. Preferably, the compounds selected from the group consisting of compounds of general formula I-1, general formula I-2, general formula I-3, general formula I-4, general formula I-5, general formula I-6, and general formula I-7 account for 12% to 62% by weight of the liquid crystal composition.

[0053] In some embodiments of the present invention, in order to enable the liquid crystal composition containing it to effectively improve low-temperature miscibility, reduce dielectric loss of the liquid crystal at high frequencies, and increase the tunability of the liquid crystal at high frequencies, the compound of general formula I-1 accounts for 1%-50% (inclusive of any value or subrange within this range) of the liquid crystal composition, for example, 1%, 2%, 3%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 13%, 14%, 16%, 17%, 19%, 20%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 30%, 31%, 33%, 35%, 37%, 38%, 40%, 42%, 44%, 45%, 46%, 47%, 49%, 50%, or a range between any two of these values. Preferably, the compound of general formula I-1 accounts for 5%-30% of the weight percentage of the liquid crystal composition.

[0054] In some embodiments of the present invention, in order to enable the liquid crystal composition containing it to effectively improve low-temperature miscibility, reduce dielectric loss of the liquid crystal at high frequencies, and increase the tunability of the liquid crystal at high frequencies, the compound of general formula I-2 accounts for 1%-20% (inclusive of any value or subrange within this range) of the liquid crystal composition, for example, 1%, 2%, 3%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 13%, 14%, 16%, 17%, 19%, 20%, or any two of these values. Preferably, the compound of general formula I-2 accounts for 5%-15% of the weight of the liquid crystal composition.

[0055] In some embodiments of the present invention, in order to enable the liquid crystal composition containing it to effectively improve low-temperature miscibility, reduce dielectric loss of the liquid crystal at high frequencies, and increase the tunability of the liquid crystal at high frequencies, the compound of general formula I-3 accounts for 1%-20% (inclusive of any value or subrange within this range) of the liquid crystal composition, for example, 1%, 2%, 3%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 13%, 14%, 16%, 17%, 19%, 20%, or any two of these values. Preferably, the compound of general formula I-3 accounts for 5%-15% of the weight of the liquid crystal composition.

[0056] In some embodiments of the present invention, in order to enable the liquid crystal composition containing it to effectively improve low-temperature miscibility, reduce dielectric loss of the liquid crystal at high frequencies, and increase the tunability of the liquid crystal at high frequencies, the compound of general formula I-4 accounts for 1%-15% of the weight percentage of the liquid crystal composition (inclusive of any value or subrange within this range), for example, 1%, 2%, 3%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 13%, 14%, 15%, or any two of these values. Preferably, the compound of general formula I-4 accounts for 2%-8% of the weight percentage of the liquid crystal composition.

[0057] In some embodiments of the present invention, in order to enable the liquid crystal composition containing it to effectively improve low-temperature miscibility, reduce dielectric loss of the liquid crystal at high frequencies, and increase the tunability of the liquid crystal at high frequencies, the compound of general formula I-5 accounts for 1%-20% (inclusive of any value or subrange within this range) of the liquid crystal composition, for example, 1%, 2%, 3%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 13%, 14%, 16%, 17%, 19%, 20%, or any two of these values. Preferably, the compound of general formula I-5 accounts for 2%-15% of the weight of the liquid crystal composition.

[0058] In some embodiments of the present invention, in order to enable the liquid crystal composition containing it to effectively improve low-temperature miscibility, reduce dielectric loss of the liquid crystal at high frequencies, and increase the tunability of the liquid crystal at high frequencies, the compound of general formula I-6 accounts for 1%-30% (inclusive of any value or subrange within this range) of the liquid crystal composition, for example, 1%, 2%, 3%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 13%, 14%, 16%, 17%, 19%, 20%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 30%, or any two of these values. Preferably, the compound of general formula I-6 accounts for 5%-20% of the weight of the liquid crystal composition.

[0059] In some embodiments of the present invention, in order to enable the liquid crystal composition containing it to effectively improve low-temperature miscibility, reduce dielectric loss of the liquid crystal at high frequencies, and increase the tunability of the liquid crystal at high frequencies, the compound of general formula I-7 accounts for 1%-15% of the weight percentage of the liquid crystal composition (inclusive of any value or subrange within this range), for example, 1%, 2%, 3%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 13%, 14%, 15%, or any two of these values. Preferably, the compound of general formula I-7 accounts for 2%-6% of the weight percentage of the liquid crystal composition.

[0060] In some embodiments of the present invention, in order to enable the liquid crystal composition containing it to effectively improve low-temperature miscibility, reduce dielectric loss of the liquid crystal at high frequencies, and increase tunability of the liquid crystal at high frequencies, at least one (e.g., one, two, three, four, or five) is selected from compounds of general formula I-1-1, compounds of general formula I-1-4, compounds of general formula I-2-3, compounds of general formula I-2-6, compounds of general formula I-3-3, compounds of general formula I-3-6, compounds of general formula I-3-9, compounds of general formula I-3-12, compounds of general formula I-4-6, compounds of general formula I-5-3, compounds of general formula I-6-3, and compounds of general formula I-4-6. The compounds of the group consisting of compounds of formula I-6-6, compounds of general formula I-7-1, and compounds of general formula I-7-3 constitute 13% to 60% by weight of the liquid crystal composition (inclusive of any value or subrange within this range), for example, 13%, 14%, 16%, 17%, 19%, 20%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 30%, 31%, 33%, 35%, 37%, 38%, 40%, 42%, 44%, 45%, 46%, 47%, 49%, 50%, 52%, 54%, 56%, 58%, 60%, or any two of these values.

[0061] In some embodiments of the present invention, the compound of general formula II is selected from the group consisting of the following compounds:

[0062] as well as

[0063]

[0064] In some embodiments of the invention, R3 represents an alkyl or alkoxy group containing 1-10 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10) carbon atoms. R3 is further preferably an alkyl or alkoxy group containing 2-7 (e.g., 2, 3, 4, 5, 6, 7) carbon atoms.

[0065] In some embodiments of the present invention, the X 18 X 19 X 22 X 23 Whether the X and X are the same or different, they can each independently represent H, halogen, or alkoxy group containing 1-3 carbon atoms. Preferably, the X... 18 X 19 X 22 X 23 Whether the X and X are the same or different, they each independently represent H or halogen. Preferably, the X... 18 X 19 X 22 X 23 Each can be represented independently as H or F.

[0066] In some embodiments of the present invention, in order to enable the liquid crystal composition containing it to effectively improve low-temperature miscibility, reduce dielectric loss of liquid crystal at high frequencies, and increase tunability of liquid crystal at high frequencies, the compound of general formula II comprises at least one (e.g., one, two, three, four or five) compound selected from the group consisting of compounds of general formula II-1, II-2, II-3, II-5 and II-7.

[0067] In some embodiments of the present invention, the compound of general formula II is selected from the group consisting of the following compounds:

[0068]

[0069]

[0070] as well as

[0071]

[0072] In some embodiments of the invention, R3 represents an alkyl or alkoxy group containing 1-10 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10) carbon atoms. R3 is further preferably an alkyl or alkoxy group containing 2-7 (e.g., 2, 3, 4, 5, 6, 7) carbon atoms.

[0073] In some embodiments of the present invention, in order to enable the liquid crystal composition containing it to effectively improve low-temperature miscibility, reduce dielectric loss of the liquid crystal at high frequencies, and increase the tunability of the liquid crystal at high frequencies, the compound of general formula II comprises at least one (e.g., one, two, three, four, or five) compound selected from the group consisting of compounds of general formula II-1-2, compounds of general formula II-1-3, compounds of general formula II-2-3, compounds of general formula II-3-3, compounds of general formula II-5-3, compounds of general formula II-5-6, compounds of general formula II-5-9, compounds of general formula II-7-2, and compounds of general formula II-7-3.

[0074] In some embodiments of the present invention, it is preferable to adjust the content of the compound of general formula II so that the liquid crystal composition containing it can effectively improve low-temperature miscibility, reduce the dielectric loss of the liquid crystal at high frequencies, and increase the tunability of the liquid crystal at high frequencies.

[0075] In some embodiments of the invention, the compound of general formula II constitutes 0.1% to 80% (inclusive of any value or subrange within this range) of the weight percentage of the liquid crystal composition, for example, 0.1%, 0.5%, 1%, 2%, 3%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 13%, 14%, 16%, 17%, 19%, 20%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 30%, 31%, 33%. The percentages are 35%, 37%, 38%, 40%, 42%, 44%, 45%, 46%, 47%, 49%, 50%, 52%, 54%, 56%, 58%, 60%, 65%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, or a range between any two of these values. Preferably, the compound of general formula II accounts for 20%-80% of the weight percentage of the liquid crystal composition.

[0076] In some embodiments of the present invention, in order to enable the liquid crystal composition containing it to effectively improve low-temperature miscibility, reduce dielectric loss of the liquid crystal at high frequencies, and increase the tunability of the liquid crystal at high frequencies, at least one (e.g., one, two, three, four, or five) compound selected from the group consisting of compounds of general formula II-1, general formula II-2, general formula II-3, general formula II-5, and general formula II-7 accounts for 22%-80% (inclusive of any compound within this range) of the weight percentage of the liquid crystal composition. (A numerical value or sub-range), for example, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 30%, 31%, 33%, 35%, 37%, 38%, 40%, 42%, 44%, 45%, 46%, 47%, 49%, 50%, 52%, 54%, 56%, 58%, 60%, 65%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, or a range between any two of these numerical values. Preferably, the compounds of the group consisting of compounds of general formula II-1, general formula II-2, general formula II-3, general formula II-5, and general formula II-7 constitute 23%-78% by weight of the liquid crystal composition.

[0077] In some embodiments of the present invention, in order to enable the liquid crystal composition containing it to effectively improve low-temperature miscibility, reduce dielectric loss of the liquid crystal at high frequencies, and increase the tunability of the liquid crystal at high frequencies, the compound of general formula II-1 accounts for 1%-40% (inclusive of any value or subrange within this range) of the liquid crystal composition, for example, 1%, 2%, 3%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 13%, 14%, 16%, 17%, 19%, 20%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 30%, 31%, 33%, 35%, 37%, 38%, 40%, or a range between any two of these values. Preferably, the compound of general formula II-1 accounts for 10%-40% of the liquid crystal composition by weight.

[0078] In some embodiments of the present invention, in order to enable the liquid crystal composition containing it to effectively improve low-temperature miscibility, reduce dielectric loss of the liquid crystal at high frequencies, and increase the tunability of the liquid crystal at high frequencies, the compound of general formula II-2 accounts for 1%-10% (inclusive of any value or subrange within this range) of the liquid crystal composition, for example, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, or a range between any two of these values. Preferably, the compound of general formula II-2 accounts for 2%-8% of the weight of the liquid crystal composition.

[0079] In some embodiments of the present invention, in order to enable the liquid crystal composition containing it to effectively improve low-temperature miscibility, reduce dielectric loss of the liquid crystal at high frequencies, and increase the tunability of the liquid crystal at high frequencies, the compound of general formula II-3 accounts for 2%-20% (inclusive of any value or subrange within this range) of the liquid crystal composition, for example, 2%, 3%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 13%, 14%, 16%, 17%, 19%, 20%, or any two of these values. Preferably, the compound of general formula II-3 accounts for 5%-15% of the weight of the liquid crystal composition.

[0080] In some embodiments of the present invention, in order to enable the liquid crystal composition containing it to effectively improve low-temperature miscibility, reduce dielectric loss of the liquid crystal at high frequencies, and increase the tunability of the liquid crystal at high frequencies, the compound of general formula II-5 accounts for 1%-40% (inclusive of any value or subrange within this range) of the liquid crystal composition, for example, 1%, 2%, 3%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 13%, 14%, 16%, 17%, 19%, 20%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 30%, 31%, 33%, 35%, 37%, 38%, 40%, or any two of these values. Preferably, the compound of general formula II-5 accounts for 5%-30% of the weight of the liquid crystal composition.

[0081] In some embodiments of the present invention, in order to enable the liquid crystal composition containing it to effectively improve low-temperature miscibility, reduce dielectric loss of the liquid crystal at high frequencies, and increase the tunability of the liquid crystal at high frequencies, the compound of general formula II-7 accounts for 1%-10% of the weight percentage of the liquid crystal composition (inclusive of any value or subrange within this range), for example, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, or a range between any two of these values. Preferably, the compound of general formula II-7 accounts for 2%-6% of the weight percentage of the liquid crystal composition.

[0082] In some embodiments of the present invention, at least one (e.g., one, two, three, four, or five) compound selected from the group consisting of compounds of general formula II-1-2, general formula II-1-3, general formula II-2-3, general formula II-3-3, general formula II-5-3, general formula II-5-6, general formula II-5-9, general formula II-7-2, and general formula II-7-3 constitutes 23%-78% by weight of the liquid crystal composition. (Including any values ​​or subranges within the range), for example, 23%, 24%, 25%, 26%, 27%, 28%, 30%, 31%, 33%, 35%, 37%, 38%, 40%, 42%, 44%, 45%, 46%, 47%, 49%, 50%, 52%, 54%, 56%, 58%, 60%, 65%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, or a range between any two of these values.

[0083] In some embodiments of the present invention, the compound of general formula III is selected from the group consisting of the following compounds:

[0084]

[0085] as well as

[0086] In some embodiments of the invention, R5 represents an alkyl or alkoxy group containing 1-10 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10) carbon atoms. R5 is further preferably an alkyl group containing 1-5 (e.g., 1, 2, 3, 4, 5) carbon atoms.

[0087] In some embodiments of the present invention, the X 25 X 26 X 27 X 28 The same or different, each independently representing H, halogen, alkyl group containing 1-3 carbon atoms, or alkoxy group containing 1-3 carbon atoms. X 25 X 26 X 27 X 28 Further preferably, each of the X elements independently represents H or a halogen. 25 X 26 X 27 X 28 Further preferably, each H or F is independent.

[0088] In some embodiments of the present invention, in order to enable the liquid crystal composition containing it to effectively improve low-temperature miscibility, reduce dielectric loss of the liquid crystal at high frequencies, and increase the tunability of the liquid crystal at high frequencies, the compound of general formula III comprises at least one (e.g., one, two, three, four, or five) compound selected from the group consisting of compounds of general formula III-1, general formula III-2, general formula III-3, general formula III-4, general formula III-5, general formula III-6, and general formula III-7.

[0089] In some embodiments of the present invention, the compound of general formula III is selected from the group consisting of the following compounds:

[0090]

[0091]

[0092] as well as

[0093]

[0094] In some embodiments of the invention, R5 represents an alkyl or alkoxy group containing 1-10 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10) carbon atoms. R5 is further preferably an alkyl or alkoxy group containing 1-5 (e.g., 1, 2, 3, 4, 5) carbon atoms.

[0095] In some embodiments of the present invention, in order to enable the liquid crystal composition containing it to effectively improve low-temperature miscibility, reduce dielectric loss of the liquid crystal at high frequencies, and increase the tunability of the liquid crystal at high frequencies, the compound of general formula III comprises at least one (e.g., one, two, three, four, or five) compound selected from the group consisting of compounds of general formula III-1-1, general formula III-2-1, general formula III-3-1, general formula III-4-1, general formula III-5-1, general formula III-6-1, and general formula III-7-1.

[0096] In some embodiments of the present invention, it is preferable to adjust the content of the compound of general formula III so that the liquid crystal composition containing it can effectively improve low-temperature miscibility, reduce the dielectric loss of the liquid crystal at high frequencies, and increase the tunability of the liquid crystal at high frequencies.

[0097] In some embodiments of the invention, the compound of general formula III constitutes 0.1% to 50% (inclusive of any value or subrange within this range) of the liquid crystal composition by weight, 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%. The percentages are 1%, 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 any range between two of these values. Preferably, the compound of general formula III accounts for 1% to 15% of the weight percentage of the liquid crystal composition.

[0098] In some embodiments of the present invention, in order to enable the liquid crystal composition containing it to effectively improve low-temperature miscibility, reduce dielectric loss of the liquid crystal at high frequencies, and increase the tunability of the liquid crystal at high frequencies, at least one (e.g., one, two, three, four, or five) compound selected from the group consisting of compounds of general formula III-1, general formula III-2, general formula III-3, general formula III-4, general formula III-5, general formula III-6, and general formula III-7 accounts for 1% to 14% (inclusive of any value or subrange within this range) of the weight of the liquid crystal composition, for example, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, or a range between any two of these values. Preferably, the compounds of the group consisting of compounds of general formula III-1, general formula III-2, general formula III-3, general formula III-4, general formula III-5, general formula III-6, and general formula III-7 account for 1%-13% by weight of the liquid crystal composition.

[0099] In some embodiments of the present invention, in order to enable the liquid crystal composition containing it to effectively improve low-temperature miscibility, reduce dielectric loss of the liquid crystal at high frequencies, and increase the tunability of the liquid crystal at high frequencies, the compound of general formula III-1 accounts for 1%-10% (inclusive of any value or subrange within this range) of the liquid crystal composition, for example, 1%, 2%, 3%, 4%, 4.5%, 5%, 6%, 7%, 8%, 9%, 10%, or a range between any two of these values. Preferably, the compound of general formula III-1 accounts for 2%-5% of the weight of the liquid crystal composition.

[0100] In some embodiments of the present invention, in order to enable the liquid crystal composition containing it to effectively improve low-temperature miscibility, reduce dielectric loss of the liquid crystal at high frequencies, and increase the tunability of the liquid crystal at high frequencies, the compound of general formula III-2 accounts for 1%-10% (inclusive of any value or subrange within this range) of the liquid crystal composition, for example, 1%, 2%, 3%, 4%, 4.5%, 5%, 6%, 7%, 8%, 9%, 10%, or a range between any two of these values. Preferably, the compound of general formula III-2 accounts for 2%-5% of the weight of the liquid crystal composition.

[0101] In some embodiments of the present invention, in order to enable the liquid crystal composition containing it to effectively improve low-temperature miscibility, reduce dielectric loss of the liquid crystal at high frequencies, and increase the tunability of the liquid crystal at high frequencies, the compound of general formula III-3 accounts for 1%-10% (inclusive of any value or subrange within this range) of the liquid crystal composition, for example, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, or a range between any two of these values. Preferably, the compound of general formula III-3 accounts for 1%-5% of the weight of the liquid crystal composition.

[0102] In some embodiments of the present invention, in order to enable the liquid crystal composition containing it to effectively improve low-temperature miscibility, reduce dielectric loss of the liquid crystal at high frequencies, and increase the tunability of the liquid crystal at high frequencies, the compound of general formula III-4 accounts for 1%-10% (inclusive of any value or subrange within this range) of the liquid crystal composition, for example, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, or a range between any two of these values. Preferably, the compound of general formula III-4 accounts for 1%-5% of the weight of the liquid crystal composition.

[0103] In some embodiments of the present invention, in order to enable the liquid crystal composition containing it to effectively improve low-temperature miscibility, reduce dielectric loss of the liquid crystal at high frequencies, and increase the tunability of the liquid crystal at high frequencies, the compound of general formula III-5 accounts for 1%-10% of the weight percentage of the liquid crystal composition (inclusive of any value or subrange within this range), for example, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, or a range between any two of these values. Preferably, the compound of general formula III-5 accounts for 1%-5% of the weight percentage of the liquid crystal composition.

[0104] In some embodiments of the present invention, in order to enable the liquid crystal composition containing it to effectively improve low-temperature miscibility, reduce dielectric loss of the liquid crystal at high frequencies, and increase the tunability of the liquid crystal at high frequencies, the compound of general formula III-6 accounts for 1%-10% (inclusive of any value or subrange within this range) of the liquid crystal composition, for example, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, or a range between any two of these values. Preferably, the compound of general formula III-6 accounts for 2%-5% of the weight of the liquid crystal composition.

[0105] In some embodiments of the present invention, in order to enable the liquid crystal composition containing it to effectively improve low-temperature miscibility, reduce dielectric loss of the liquid crystal at high frequencies, and increase the tunability of the liquid crystal at high frequencies, the compound of general formula III-7 accounts for 1%-10% (inclusive of any value or subrange within this range) of the liquid crystal composition, for example, 1%, 2%, 3%, 4%, 4.5%, 5%, 6%, 7%, 8%, 9%, 10%, or a range between any two of these values. Preferably, the compound of general formula III-7 accounts for 2%-5% of the weight of the liquid crystal composition.

[0106] In some embodiments of the present invention, in order to enable the liquid crystal composition containing it to effectively improve low-temperature miscibility, reduce dielectric loss of the liquid crystal at high frequencies, and increase the tunability of the liquid crystal at high frequencies, at least one (e.g., one, two, three, four, or five) compound selected from the group consisting of compounds of general formula III-1-1, general formula III-2-1, general formula III-3-1, general formula III-4-1, general formula III-5-1, general formula III-6-1, and general formula III-7-1 accounts for 2% to 7% (inclusive of any value or subrange within this range) of the weight of the liquid crystal composition, for example, 2%, 3%, 4%, 4.5%, 5%, 6%, 7%, or a range between any two of these values.

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

[0108]

[0109] Among them, R M1 and R M2 Each independently represents a straight-chain or branched alkyl, alkoxy, or [organism / structure] containing 1-12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms. One or at least two non-adjacent -CH2- groups of 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-;

[0110] ring ring and ring Each represents independently The One or more of the -CH2- bonds can be replaced by -O- bonds, and one or at most two single bonds in the ring can be replaced by double bonds. One or both -H can be substituted by halogens, alkyl groups containing 1-3 carbon atoms, or alkoxy groups containing 1-3 carbon atoms;

[0111] Z M1 and Z M2 Each can independently represent a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CF2CF2-, -CF2O-, -CH2CH2-, or -(CH2)4-;

[0112] n M Represents 0, 1, 2, or 3, where when n M When = 2 or 3, the ring Same or different, Z M2 Same or different.

[0113] In some embodiments of the present invention, the compound of general formula M is selected from the group consisting of the following compounds:

[0114]

[0115]

[0116] as well as

[0117]

[0118] Among them, R M1 and R M2 Each of the following independently represents a straight-chain or branched alkyl group containing 1 to 10 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10) carbon atoms, wherein one or at least two 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-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-.

[0119] In some embodiments of the present invention, the R M1 and R M2 Each of these terms independently represents a straight-chain alkyl group containing 2-5 (e.g., 2, 3, 4, or 5) carbon atoms, or a straight-chain alkoxy group containing 1-4 (e.g., 1, 2, 3, or 4) carbon atoms.

[0120] In some embodiments of the present invention, it is preferable to adjust the content of the compound of general formula M so that the liquid crystal composition containing it can effectively improve low-temperature miscibility, reduce the dielectric loss of the liquid crystal at high frequencies, and increase the tunability of the liquid crystal at high frequencies.

[0121] In some embodiments of the present invention, in order to enable the liquid crystal composition containing it to effectively improve low-temperature miscibility, reduce dielectric loss of liquid crystal at high frequencies, and increase tunability of liquid crystal at high frequencies, the compound of general formula M contains at least one (e.g., one, two, three, four, or five) compound selected from the group consisting of compounds of general formula M-1, general formula M-3, general formula M-10, general formula M-21, and general formula M-24.

[0122] In some embodiments of the invention, the compound of general formula M constitutes 0.1% to 60% (inclusive of any value or subrange within this range) of the weight percentage of the liquid crystal composition, 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%. The percentages are 1%, 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 any range between any two of these values. Preferably, the compound of general formula M accounts for 1%-30% of the weight percentage of the liquid crystal composition.

[0123] In some embodiments of the present invention, in order to enable the liquid crystal composition containing it to effectively improve low-temperature miscibility, reduce dielectric loss of the liquid crystal at high frequencies, and increase the tunability of the liquid crystal at high frequencies, at least one (e.g., one, two, three, four, or five) compound selected from the group consisting of compounds of general formula M-2, general formula M-3, general formula M-10, general formula M-21, and general formula M-24 accounts for 2% to 30% by weight of the liquid crystal composition (inclusive of any value or subrange within this range), for example, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, or a range between any two of these values. Preferably, the compounds of the group consisting of compounds of general formula M-2, general formula M-3, general formula M-21, general formula M-30, general formula M-31, and general formula M-32 account for 2%-25% by weight of the liquid crystal composition.

[0124] In addition to the compounds described above, the liquid crystal compositions of the present invention may also contain any one or a combination of at least two of the following: conventional nematic liquid crystals, smectic liquid crystals, cholesteric liquid crystals, polymerizable monomers, dyes, and additives.

[0125] In some embodiments of the present invention, in order to further reduce dielectric loss at high frequencies, the liquid crystal composition further includes at least one dye molecule.

[0126] In a preferred embodiment, the dye molecule comprises any one or a combination of at least two of anthraquinone, azo, arylmethane, phthalocyanine, or thiophene.

[0127] In some embodiments of the present invention, the liquid crystal composition further includes at least one additive.

[0128] In a preferred embodiment, the additive includes any one or a combination of at least two of nitrogen-oxygen additives, dopants, antioxidants, ultraviolet absorbers, infrared absorbers, and light stabilizers.

[0129] In some embodiments of the present invention, the nitrogen-oxygen additive is selected from any one or a combination of at least two of the following compounds:

[0130]

[0131]

[0132] Where n2 represents a positive integer from 1 to 18; "+" represents a free radical.

[0133] In a second aspect, the present invention provides a liquid crystal display device, the liquid crystal display device comprising the liquid crystal composition as described in the first aspect.

[0134] Compared with the prior art, the present invention has the following beneficial effects:

[0135] The liquid crystal composition provided by the present invention can effectively improve low-temperature miscibility, reduce dielectric loss of liquid crystal at high frequency, and increase the tunability of liquid crystal at high frequency, while maintaining appropriate clearing point, appropriate optical anisotropy and absolute value of dielectric anisotropy. Detailed Implementation

[0136] To facilitate understanding of the present invention, the following embodiments are provided. Those skilled in the art should understand that these embodiments are merely illustrative and should not be construed as limiting the scope of the invention.

[0137] For ease of explanation, in the following embodiments, the group structures of each component in the liquid crystal composition are represented by the codes listed in Table 1:

[0138] Table 1. Structural codes of compound groups in liquid crystal compositions

[0139]

[0140]

[0141] In Table 1, short bonds represent access sites for functional groups.

[0142] Take the following compound with the following structural formula as an example:

[0143]

[0144] 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 cyclohexyl, G represents 2-fluoro-1,4-phenylene, and F represents fluorine.

[0145] In the following examples and comparative examples, the abbreviated codes for the performance test items are shown in Table 2:

[0146] Table 2. Abbreviations for Performance Test Items

[0147]

[0148]

[0149] in:

[0150] Cp: ​​Obtained by testing with a melting point apparatus.

[0151] Δn: Δn = n e -n0 was obtained by testing with an Abbe refractometer under a sodium lamp (589nm) light source at 25°C.

[0152] 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.

[0153] Δεr: The dielectric constant is divided into a component parallel to the long axis of the liquid crystal, “εr∥”, and a component perpendicular to it, “εr⊥”. The dielectric constant value is Δεr=εr / / -εr⊥.

[0154] tanδεr⊥, tanδεr / / : In physics, the quantitative expression of microwave "dielectric loss" is: the tangent of dielectric loss (tanδεr⊥, tanδεr / / ), which is a key dielectric performance parameter reflecting the liquid crystal material in a microwave field. Generally, the maximum dielectric loss is tanδεr max=max(tanδεr⊥, tanδεr / / ).

[0155] τ:τ≡(Δεr / εr||)

[0156] t: The time recorded when the nematic liquid crystal medium is placed in a low-temperature box or bottle, stored at different low temperatures, and when crystal precipitation is observed.

[0157] η: η≡(τ / tanδεr, max.), where the maximum dielectric loss is tanδεr, max.max.{tanδεr⊥;tanδεr||}.

[0158] The dielectric constants εr / / and εr⊥, as well as the tangent values ​​of dielectric loss (tanδεr⊥ and tanδεr∥) at high frequencies, can be tested using a vector network analyzer combined with the resonant cavity perturbation method.

[0159] The compounds used in the following examples can be synthesized using well-known methods or obtained commercially. These synthesis techniques are conventional, and the resulting liquid crystal compositions have been tested and found to meet electronic compound standards.

[0160] Liquid crystal compositions were prepared according to the proportions of the liquid crystal compositions in the following examples. The liquid crystal compositions were prepared according to conventional methods in the art, such as mixing in a specified proportion by heating, ultrasound, suspension, etc.

[0161] Comparative Example 1

[0162] This comparative example provides a liquid crystal composition comprising the components shown in the table below by weight percentage, and the composition is filled between two substrates of a liquid crystal display for performance testing:

[0163]

[0164]

[0165] Example 1

[0166] This embodiment provides a liquid crystal composition comprising the components shown in the table below by weight percentage, and the composition is filled between two substrates of a liquid crystal display for performance testing:

[0167]

[0168] Example 2

[0169] This embodiment provides a liquid crystal composition comprising the components shown in the table below by weight percentage, and the composition is filled between two substrates of a liquid crystal display for performance testing:

[0170]

[0171] Example 3

[0172] This embodiment provides a liquid crystal composition comprising the components shown in the table below by weight percentage, and the composition is filled between two substrates of a liquid crystal display for performance testing:

[0173]

[0174]

[0175] Example 4

[0176] This embodiment provides a liquid crystal composition comprising the components shown in the table below by weight percentage, and the composition is filled between two substrates of a liquid crystal display for performance testing:

[0177]

[0178]

[0179] Example 5

[0180] This embodiment provides a liquid crystal composition comprising the components shown in the table below by weight percentage, and the composition is filled between two substrates of a liquid crystal display for performance testing:

[0181]

[0182] Example 6

[0183] This embodiment provides a liquid crystal composition comprising the components shown in the table below by weight percentage, and the composition is filled between two substrates of a liquid crystal display for performance testing:

[0184]

[0185]

[0186] Example 7

[0187] This embodiment provides a liquid crystal composition comprising the components shown in the table below by weight percentage, and the composition is filled between two substrates of a liquid crystal display for performance testing:

[0188]

[0189]

[0190] Example 8

[0191] This embodiment provides a liquid crystal composition comprising the components shown in the table below by weight percentage, and the composition is filled between two substrates of a liquid crystal display for performance testing:

[0192]

[0193] As can be seen from the comparison of the embodiments and comparative examples of this application, by the relevant compounding of specific structures and contents of the compounds, the liquid crystal composition can effectively improve low-temperature miscibility, reduce the dielectric loss of the liquid crystal at high frequencies, and increase the tunability of the liquid crystal at high frequencies.

[0194] The applicant declares that the detailed process flow of this invention is illustrated by the above embodiments, but this invention is not limited to the above detailed process flow, that is, it does not mean that this invention must rely on the above detailed process flow to be implemented. Those skilled in the art should understand that any improvements to this invention, equivalent substitutions of raw materials for the product of this invention, addition of auxiliary components, and selection of specific methods, etc., all fall within the protection scope and disclosure scope of this invention.

Claims

1. A liquid crystal composition, characterized in that, The liquid crystal composition comprises at least one compound of general formula I, at least one compound of general formula II, and at least one compound of general formula III: as well as Wherein, R1 represents a straight-chain or branched alkyl group containing 1-12 carbon atoms. One or at least two non-adjacent -CH2- groups of 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-; R2 is represented as -NCS; R3 indicates a straight-chain or branched alkyl group containing 1-12 carbon atoms. One or at least two non-adjacent -CH2- groups of 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-; R4 is represented as -NCS; R5 indicates a straight-chain or branched alkyl group containing 1-12 carbon atoms. One or at least two non-adjacent -CH2- groups of 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 ring or ring Whether they are the same or different, they are expressed independently. Among them rings One or more -CH2- bonds can be replaced by -O- bonds, and one or more single bonds in a ring can be replaced by double bonds; ring ring or ring Whether they are the same or different, they are expressed independently. Among them rings One or more -CH2- bonds can be replaced by -O- bonds, and one or more single bonds in a ring can be replaced by double bonds; ring ring Whether they are the same or different, they are expressed independently. Among them rings One or more -CH2- bonds can be replaced by -O- bonds, and one or more single bonds in a ring can be replaced by double bonds; X1~X 12 The same or different, each independently representing H, halogen, alkyl group containing 1-3 carbon atoms, alkoxy group containing 1-3 carbon atoms; X1~X 12 At least one of them represents methyl or ethyl; X 13 ~X 24 Each can independently represent H, halogens, or alkoxy groups containing 1-3 carbon atoms; X 25 ~X 28 Each can be independently represented by H, halogen, alkyl group containing 1-3 carbon atoms, or alkoxy group containing 1-3 carbon atoms; Z1 and Z2 independently represent single bonds, -O-, -S-, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, -CF2CF2-, -(CH2)4-, -CF2O-, or -OCF2-; Z3 and Z4 independently represent single bonds, -O-, -S-, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, -CF2CF2-, -(CH2)4-, -CF2O-, or -OCF2-; Z5 represents a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, -CF2CF2-, -(CH2)4-, -CF2O-, or -OCF2-; n represents 0, 1, 2, m represents 0, 1, 2, and 1 represents 1, 2. When n = 2, Whether they are the same or different, when m=2, Same or different; when 1 = 2, Same or different; p represents 0, 1, 2, q represents 0, 1, 2, e represents 1, 2, when p = 2, Same or different; when q = 2, Same or different; when e = 2, the ring Same or different; f represents 0, 1, 2, and h represents 1, 2. When f = 2, Same or different; when h = 2, Same or different, Z5 is the same or different.

2. The liquid crystal composition according to claim 1, characterized in that, The compounds of general formula I are selected from the group consisting of the following compounds: as well as 3. The liquid crystal composition according to claim 1 or 2, characterized in that, The compounds of general formula I are selected from the group consisting of the following compounds: as well as 4. The liquid crystal composition according to any one of the preceding claims, characterized in that, The compounds of general formula II are selected from the group consisting of the following compounds: as well as 5. The liquid crystal composition according to any one of the preceding claims, characterized in that, The compounds of general formula II are selected from the group consisting of the following compounds:

6. The liquid crystal composition according to any one of the preceding claims, characterized in that, The compounds of general formula III are selected from the group consisting of the following compounds: as well as 7. The liquid crystal composition according to any one of the preceding claims, characterized in that, The compounds of general formula III are selected from the group consisting of the following compounds: as well as 8. The liquid crystal composition according to any one of the preceding claims, 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 at least two non-adjacent -CH2- groups of 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 ring and ring Each represents independently The One or more of the -CH2- bonds can be replaced by -O- bonds, and one or at most two single bonds in the ring can be replaced by double bonds. One or both -H can be substituted by halogens, alkyl groups containing 1-3 carbon atoms, or alkoxy groups containing 1-3 carbon atoms; Z M1 and Z M2 Each can independently represent a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CF2CF2-, -CF2O-, -CH2CH2-, or -(CH2)4-; n M Represents 0, 1, 2, or 3, where when n M When = 2 or 3, the ring Same or different, Z M2 Same or different; The compound of general formula M accounts for 0.1%-60% of the weight percentage of the liquid crystal composition.

9. The liquid crystal composition according to claim 8, characterized in that, The compounds of general formula M are selected from the group consisting of the following compounds: as well as 10. The liquid crystal composition according to any one of the preceding claims, characterized in that, The compound of general formula I accounts for 0.1%-70% of the liquid crystal composition by weight; the compound of general formula II accounts for 0.1%-80% of the liquid crystal composition by weight; and the compound of general formula III accounts for 0.1%-50% of the liquid crystal composition by weight.

11. 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 1-10.

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