Liquid crystal composition and liquid crystal display device thereof

Abstract

The present application provides a liquid crystal composition and a liquid crystal display device thereof. The liquid crystal composition of the present application comprises at least one compound of general formula I and at least one compound of general formula B. The liquid crystal composition of the present application has a higher clearing point, a higher absolute value of dielectric anisotropy, a higher K value (K 11 and K 33 ), a smaller rotational viscosity, a shorter response time, a higher transmittance, a higher contrast ratio and a longer low-temperature storage time, i.e. the performance requirements of higher contrast ratio and shorter response speed are met.

Description

Technical Field

[0001] This invention relates to the field of liquid crystals, and more particularly to liquid crystal compositions and liquid crystal display devices comprising said liquid crystal compositions. 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. Based on display mode, LCDs can be classified into PC (phase change), TN (twist nematic), STN (super twisted nematic), ECB (electrically controlled birefringence), OCB (optically compensated bend), IPS (in-plane switching), FFS (fringe field switching), VA (vertical alignment), and PSA (polymer stable alignment). Based on the driving method of the components, LCD elements can be classified into PM (passive matrix) and AM (active matrix) types. PM is further divided into static and multiplex types. AM is divided into TFT (thin film transistor) and MIM (metal-insulator-metal) types. TFTs include amorphous silicon and polycrystalline silicon. The latter is further divided into high-temperature and low-temperature types based on the manufacturing process.

[0003] Liquid crystal display elements contain a nematic liquid crystal composition with suitable properties. By improving the properties of the liquid crystal composition, AM elements with good properties can be obtained. The relationship between the properties of the liquid crystal composition and the AM element is summarized in Table A below. The properties of the liquid crystal composition are further explained based on commercially available AM ​​elements. The temperature range of the nematic phase is related to the temperature range of the element. The viscosity of the liquid crystal composition is related to the response time of the element. For the element to display dynamic images, a shorter response time is preferred.

[0004] Table A: Characteristics of the liquid crystal composition and characteristics of AM elements

[0005] 1 Nematic phases have a wide temperature range Wide range of temperature applications 2 Low viscosity Short response time 3 Large optical anisotropy High contrast 4 Large absolute value of dielectric anisotropy Low threshold voltage, low power consumption, and high contrast. 5 High resistivity High voltage retention and high contrast 6 Stable to ultraviolet light and heat Long lifespan 7 Large elastic constant High contrast, short response time, and fast response speed

[0006] In the application of liquid crystal display devices, contrast ratio is crucial to visual effects. Generally speaking, the higher the contrast ratio, the clearer and more striking the image, and the more vivid and vibrant the colors; conversely, if the contrast ratio is low, the entire image appears hazy and dull. High contrast ratio greatly improves image clarity, detail, and grayscale performance. High-contrast products have advantages in terms of black-and-white contrast, clarity, and image integrity. Contrast ratio also significantly affects the display effect of dynamic video. Because the transitions between light and dark in dynamic images are relatively rapid, the higher the contrast ratio, the easier it is for the human eye to distinguish these transitions.

[0007] To improve the response speed of liquid crystal display devices, it is necessary to minimize the rotational viscosity of the liquid crystal material. However, low-viscosity liquid crystal materials generally have lower clearing points and optical anisotropy. Therefore, when formulating liquid crystal compositions, other performance requirements must be considered while reducing viscosity.

[0008] The threshold voltage of a mixed liquid crystal mainly depends on the Δε of the liquid crystal. A larger Δε is beneficial for reducing the threshold voltage. By mixing liquid crystal monomers of different polarities, the Δε of the mixed liquid crystal can be modulated to a suitable value to meet the operating voltage requirements of display devices. However, increasing the Δε of the liquid crystal may increase its viscosity and reduce its stability.

[0009] According to the transmittance formula T in IPS mode r ∝|Δε| / ε ⊥ (where T) r Indicates transmittance, "∝" indicates an inverse proportional relationship, Δε represents dielectric anisotropy, and ε ⊥ (This represents the dielectric constant perpendicular to the molecular axis). To improve the transmittance of a liquid crystal medium, one can try to reduce its |Δε|, but the adjustment range of the driving voltage for a given product is generally limited. Furthermore, under the influence of the perpendicular component of the edge electric field, liquid crystal molecules will tilt towards the Z-axis, causing a change in their optical anisotropy, according to the formula... (Where, χ is the angle between the optical axis of the liquid crystal layer and the optical axis of the polarizer, Δn is the optical anisotropy, d is the spacing of the liquid crystal cells, and λ is the wavelength.) It can be seen that the effective Δn*d will affect T. r Therefore, if the transmittance of positive liquid crystal media is to be increased, Δn*d can also be considered, but the delay amount of each product is designed to be fixed.

[0010] On the other hand, based on traditional IPS-LCD light leakage performance testing, those skilled in the art have found that the main causes of light leakage problems in liquid crystal display devices are: light scattering (LC scattering), rubbing uniformity, color filter light leakage (CF / TFT scattering), and polarization ability, among which light scattering accounts for 63% of the factors affecting light leakage performance.

[0011] According to the following relationship: (where d represents the spacing between the liquid crystal cells, n) e n represents the unusual refractive index. o K represents the ordinary refractive index. ave The average elastic constant (K) ave =13(K) 11 +K 22 +K 33 ), K 11 K is the elastic constant of the development. 22 K is the torsional elastic constant. 33 (where K is the bending elastic constant). To improve light scattering in liquid crystal materials, it is necessary to increase K. ave In improving K ave In certain situations, light leakage from the liquid crystal material can be reduced.

[0012] Furthermore, the relationship between contrast ratio (CR) and luminance (L) is as follows:

[0013] CR=L 255 / L0×100%,

[0014] Among them, L 255 L1 represents the luminance in the on-state, and L0 represents the luminance in the off-state. It can be seen that the change in L0 significantly affects CR. In the off-state, L0 is independent of the dielectric properties of the liquid crystal molecules, but is related to the LC scattering of the liquid crystal material itself; the smaller the LCScattering, the smaller L0, and thus the CR will significantly increase.

[0015] In view of the above, common methods to improve contrast and transmittance can be considered from the following two aspects: (1) Keep the dielectric anisotropy Δε of the liquid crystal composition constant, and improve ε ⊥ It can effectively improve transmittance; (2) improve the average elastic constant K of the liquid crystal composition. ave The value of ...

[0016] Chinese patent CN113881444A discloses a liquid crystal medium containing a negative compound with a cyclohexene ring. It also discloses a liquid crystal medium with a high elastic constant, good contrast, and fast response time. However, its rotational viscosity value remains at the level of 120-250 mPa·s, and it still fails to solve the problem of achieving a fast response of the liquid crystal composition.

[0017] Japanese Patent JP2019147859A discloses a liquid crystal composition of dibenzothiophene containing 3-5 carbon atoms in a cycloalkyl group. It aims to provide a liquid crystal composition with a high upper limit temperature of the nematic phase, a low lower limit temperature of the nematic phase, low viscosity, appropriate optical anisotropy, high resistivity, and high stability. However, it cannot meet the requirements of liquid crystal display devices for high contrast and fast response speed.

[0018] The modulation of mixed liquid crystal formulations requires the simultaneous adjustment of many physical properties of the liquid crystal. It is impossible to adjust one performance parameter without affecting the value of another. Sometimes, adding a certain monomeric liquid crystal to adjust a certain performance parameter of the mixed liquid crystal may be beneficial to one or more other performance parameters, but may be detrimental to the improvement of other performance parameters. Therefore, how to obtain a liquid crystal composition that can solve or partially solve the above problems remains an urgent problem to be solved in this field. Summary of the Invention

[0019] Objective of the Invention: The objective of this invention is to provide a solution that, while maintaining considerable optical anisotropy, exhibits a high clearing point, a high absolute value of dielectric anisotropy, and a high K value (K0). 11 and K 33 Liquid crystal compositions with lower rotational viscosity, shorter response time, higher transmittance, higher contrast, and longer low-temperature storage time.

[0020] Another objective of this invention is to provide a liquid crystal display device comprising the above-described liquid crystal composition.

[0021] Technical solution: To achieve the above-mentioned objectives, the present invention provides a liquid crystal composition comprising...

[0022] At least one compound of general formula I:

[0023]

[0024] At least one compound of general formula B:

[0025]

[0026] in,

[0027] R 01The -H, straight-chain alkyl group containing 1-12 (e.g., 2, 3, 4, 5, 6, 7, 8, 9, 10, or 11) carbon atoms, and branched alkyl group containing 3-12 (e.g., 4, 5, 6, 7, 8, 9, 10, or 11) carbon atoms, wherein one or more of the straight-chain alkyl group containing 1-12 carbon atoms and the branched alkyl group containing 3-12 carbon atoms, or two or more non-adjacent -CH2-, may be independently replaced by -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-;

[0028] R 02 This indicates a straight-chain alkyl group containing 1-12 (e.g., 2, 3, 4, 5, 6, 7, 8, 9, 10, or 11) carbon atoms, or a branched alkyl group containing 3-12 (e.g., 4, 5, 6, 7, 8, 9, 10, or 11) carbon atoms, wherein one or more of the -CH2- groups in the straight-chain alkyl group containing 1-12 carbon atoms or the branched alkyl group containing 3-12 carbon atoms can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-.

[0029] R B1 and R B2 Each of the following independently represents a halogen: a halogenated or unhalogenated straight-chain alkyl group containing 1-12 (e.g., 2, 3, 4, 5, 6, 7, 8, 9, 10, or 11) carbon atoms; or a halogenated or unhalogenated branched alkyl group containing 3-12 (e.g., 4, 5, 6, 7, 8, 9, 10, or 11) carbon atoms. or Among them are halogenated or non-halogenated straight-chain alkyl groups containing 1-12 carbon atoms, and halogenated or non-halogenated branched alkyl groups containing 3-12 carbon atoms. or One or more non-adjacent -CH2- can be independently replaced by -CH=CH-, -CH=CF-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-;

[0030] ring and ring Each represents independently or in One or more -CH2- bonds can be replaced by -O- bonds, and one or more single bonds in the ring can be replaced by double bonds, wherein One or more -H can be replaced by -F, -Cl or -CN, and -CH= in one or more rings can be replaced by -N=, at least one ring express or

[0031] ring and ring Each represents independently or in and One or more -CH2- bonds can be replaced by -O- bonds, and one or more single bonds in the ring can be replaced by double bonds, wherein and 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=;

[0032] L 01 and L 02 Each can be independently represented as -F, -Cl, -CF3, or -OCF3;

[0033] L B1 and L B2 Each can be independently represented as -H, -F, -Cl, -CF3, or -OCF3;

[0034] n 01 It represents 0, 1, 2, 3, or 4;

[0035] n 02 n represents an integer from 1 to 2. 03 Represents 0, 1, or 2, where when n 02 When 2 is represented, the ring They can be the same or different, when n 03 When 2 is represented, the ring They can be the same or different;

[0036] X B Indicates -O-, -S-, or -CO-;

[0037] X B2 and X B3 Each can be represented independently as -O- or -S-;

[0038] Z B1 and Z B2 Each can be independently represented as -CO-O-, -O-CO-, -OCH2-, -CH=CH-, -C≡C-, -CF2CF2-, -(CH2)n B3 -、-(CH2)n B3 O-、-(CH2)n B3 S-, -CF2O-, or -OCF2-, where n B3 Represents integers from 0 to 5 (e.g., 1, 2, 3, or 4); and

[0039] nB1 and n B2 Each can be independently represented as 0, 1, or 2, where when n B1 When 2 is represented, the ring They can be the same or different, where when n B2 When 2 is represented, the ring They can be the same or different.

[0040] In some embodiments of the present invention, the compounds of general formula I are selected from the group consisting of the following compounds:

[0041]

[0042] as well as

[0043]

[0044] In some embodiments of the present invention, n 01 It represents 0 or 1.

[0045] In some embodiments of the present invention, R 01 It represents -H, or a straight-chain alkyl group containing 1-5 carbon atoms.

[0046] In some embodiments of the present invention, in order to maintain a considerable optical anisotropy while having a high clearing point, a high absolute value of dielectric anisotropy, and a high K value (K0), the liquid crystal composition is designed to achieve these properties. 11 and K 33 The compounds of general formula I are selected from the group consisting of compounds of general formula I-1 and general formula I-7, which have lower rotational viscosity, shorter response time, higher transmittance, higher contrast and longer low-temperature storage time.

[0047] In some embodiments of the present invention, it is preferable to adjust the content of the compound of general formula I such that the liquid crystal composition containing it has a higher clearing point, a higher absolute value of dielectric anisotropy, and a higher K value (K0) while maintaining considerable optical anisotropy. 11 and K 33 It has lower rotational viscosity, shorter response time, higher transmittance, higher contrast, and longer low-temperature storage time.

[0048] In some embodiments of the invention, the compound of general formula I accounts for 0.1% to 40% by weight of the liquid crystal composition (inclusive of any value or subrange within this range), for example, 0.1%, 1%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, or a range between any two of these values.

[0049] In some embodiments of the present invention, the compounds of general formula B are selected from the group consisting of the following compounds:

[0050] as well as

[0051]

[0052] Among them, R B1 'Indicates a straight-chain alkyl or alkoxy group containing 1-8 carbon atoms, or a straight-chain alkenyl or alkenyloxy group containing 2-8 carbon atoms; and

[0053] X B1 It represents -O- or -CH2-.

[0054] In some embodiments of the present invention, the compound of general formula B-1 is selected from the group consisting of the following compounds:

[0055] as well as

[0056]

[0057] Among them, R B2 'Indicates a straight-chain alkyl group containing 1-5 carbon atoms;

[0058] n B4 Represents an integer from 1 to 5 (e.g., 1, 2, 3, or 4); and

[0059] n B5 It represents 0, 1, 2, 3 or 4.

[0060] In some embodiments of the present invention, the compound of general formula B is selected from the group consisting of compounds of general formula B-1-1, compounds of general formula B-1-4, compounds of general formula B-4, and compounds of general formula B-5; preferably, in order to maintain a considerable optical anisotropy, the liquid crystal composition has a high clearing point, a high absolute value of dielectric anisotropy, and a high K value (K0). 11 and K 33The compounds of general formula B are selected from the group consisting of compounds of general formulas B-1-4, B-4, and B-5, which have lower rotational viscosity, shorter response time, higher transmittance, higher contrast, and longer low-temperature storage time.

[0061] In some embodiments of the present invention, it is preferable to adjust the content of the compound of general formula B so that the liquid crystal composition containing it has a higher clearing point, a higher absolute value of dielectric anisotropy, and a higher K value (K0) while maintaining considerable optical anisotropy. 11 and K 33 It has lower rotational viscosity, shorter response time, higher transmittance, higher contrast, and longer low-temperature storage time.

[0062] In some embodiments of the invention, the compound of general formula B accounts for 0.1% to 30% by weight of the liquid crystal composition (inclusive of any value or subrange within this range), for example, 0.1%, 1%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, or a range between any two of these values.

[0063] In some embodiments of the present invention, the liquid crystal composition comprises at least one compound of general formula M:

[0064]

[0065] in,

[0066] R M1 and R M2 Each of these terms independently represents a straight-chain alkyl group containing 1-12 (e.g., 2, 3, 4, 5, 6, 7, 8, 9, 10, or 11) carbon atoms, or a branched alkyl group containing 3-12 (e.g., 4, 5, 6, 7, 8, 9, 10, or 11) carbon atoms. or One or more of the straight-chain alkyl groups containing 1-12 carbon atoms or the branched alkyl groups containing 3-12 carbon atoms, or two or more non-adjacent -CH2-, can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-.

[0067] ring

[0068] Rings and rings Each represents independently or in 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. At most one -H in the halogen can be replaced by a halogen;

[0069] Z M1 and Z M2 Each can independently represent a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -C≡C-, -CH=CH-, -CH2CH2-, or -(CH2)4-; and

[0070] 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.

[0071] In some embodiments of the present invention, preferably, R M1 and R M2 Each of these terms independently represents a straight-chain alkyl group containing 1-10 carbon atoms, a branched alkyl group containing 3-10 carbon atoms, a straight-chain alkoxy group containing 1-9 carbon atoms, a branched alkoxy group containing 3-9 carbon atoms, a straight-chain alkenyl group containing 2-10 carbon atoms, or a branched alkenyl group containing 4-10 carbon atoms; more preferably, R M1 and R M2 Each can be independently represented as a straight-chain alkyl group containing 1-8 carbon atoms, a straight-chain alkoxy group containing 1-7 carbon atoms, or a straight-chain alkenyl group containing 2-8 carbon atoms.

[0072] In some embodiments of the present invention, R M1 and R M2 Preferably, each represents a straight-chain alkenyl group containing 2-8 carbon atoms independently; R M1 and R M2 Further, each of the linear alkenyl groups containing 2-5 carbon atoms is preferred.

[0073] In some embodiments of the present invention, preferably, R M1 and R M2 One of them is a straight-chain alkenyl group containing 2-5 carbon atoms, while the other is a straight-chain alkyl group containing 1-5 carbon atoms.

[0074] In some embodiments of the present invention, preferably, R M1 and R M2 Each independently represents a straight-chain alkoxy group containing 1-8 carbon atoms; more preferably, R M1 and R M2 Each can be used independently to represent a straight-chain alkoxy group containing 1-5 carbon atoms.

[0075] In some embodiments of the present invention, preferably, R M1 and R M2 One of them is a straight-chain alkoxy group containing 1-5 carbon atoms, and the other is a straight-chain alkyl group containing 1-5 carbon atoms.

[0076] In some embodiments of the present invention, when reliability is a priority, R is preferred. M1 and R M2 All are alkyl groups; when reducing the volatility of the compound is of priority, R is preferred. M1 and R M2 All are alkoxy groups; when viscosity reduction is a priority, R is preferred. M1 and R M2 At least one of them is an alkenyl group.

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

[0078]

[0079]

[0080] as well as

[0081]

[0082] In some embodiments of the present invention, in order to maintain a considerable optical anisotropy while having a high clearing point, a high absolute value of dielectric anisotropy, and a high K value (K0), the liquid crystal composition is designed to achieve these properties. 11 and K 33 The compounds of general formula M are selected from the group consisting of compounds of general formula M-1, general formula M-4, general formula M-11 and general formula M-13, which have lower rotational viscosity, shorter response time, higher transmittance, higher contrast and longer low temperature storage time.

[0083] In some embodiments of the present invention, the compounds of general formula M-11 are selected from the group consisting of the following compounds:

[0084]

[0085]

[0086] In some embodiments of the present invention, the compound of general formula M is selected from the group consisting of compounds of general formula M-1, compounds of general formula M-4, and compounds of general formula M-111.

[0087] In some embodiments of the present invention, the content of the compound of general formula M must be appropriately adjusted according to the required properties such as solubility at low temperature, transition temperature, electrical reliability, birefringence, process adaptability, drip marks, burn-in, and dielectric anisotropy.

[0088] In some embodiments of the present invention, it is preferable to adjust the content of the compound of general formula M such that the liquid crystal composition containing it has a higher clearing point, a higher absolute value of dielectric anisotropy, and a higher K value (K0) while maintaining considerable optical anisotropy. 11 and K 33 It has lower rotational viscosity, shorter response time, higher transmittance, higher contrast, and longer low-temperature storage time.

[0089] In some embodiments of the invention, the compound of general formula M accounts for 0.1% to 70% by weight of the liquid crystal composition (inclusive of any value or subrange within this range), for example, 0.1%, 1%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, 50%, 52%, 54%, 56%, 58%, 60%, 62%, 64%, 66%, 68%, 70%, or a range between any two of these values.

[0090] In some embodiments of the present invention, the liquid crystal composition further comprises at least one compound of general formula N:

[0091]

[0092] in,

[0093] R N1 and R N2 Each of these terms independently represents a straight-chain alkyl group containing 1-12 (e.g., 2, 3, 4, 5, 6, 7, 8, 9, 10, or 11) carbon atoms, or a branched alkyl group containing 3-12 (e.g., 4, 5, 6, 7, 8, 9, 10, or 11) carbon atoms. or One or more of the straight-chain alkyl groups containing 1-12 carbon atoms or the branched alkyl groups containing 3-12 carbon atoms, or two or more of the -CH2- groups, can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-.

[0094] ring and ring Each represents independently or in One or more of the -CH2- can be replaced by -O-, where One or more -H can be replaced by -F, -Cl or -CN, and one or more -CH= in a ring can be replaced by -N=;

[0095] 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-;

[0096] L N1 and L N2 Each independently represents -H, a halogen, or an alkyl group containing 1-3 (e.g., 1, 2, or 3) carbon atoms; and

[0097] 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.

[0098] In some embodiments of the present invention, L N1 and L N2 Both represent -H.

[0099] In some embodiments of the present invention, the compounds of general formula N are selected from the group consisting of the following compounds:

[0100]

[0101]

[0102] as well as

[0103]

[0104] In some embodiments of the present invention, preferably, R N1 and R N2 Each of these terms independently represents a straight-chain alkyl group containing 1-10 carbon atoms, a branched alkyl group containing 3-10 carbon atoms, a straight-chain alkoxy group containing 1-9 carbon atoms, a branched alkoxy group containing 3-9 carbon atoms, a straight-chain alkenyl group containing 2-10 carbon atoms, or a branched alkenyl group containing 3-10 carbon atoms; more preferably, RN1 and R N2 Each can be independently represented as a straight-chain alkyl group containing 1-8 carbon atoms, a straight-chain alkoxy group containing 1-7 carbon atoms, or a straight-chain alkenyl group containing 2-8 carbon atoms.

[0105] In some embodiments of the present invention, in order to maintain a considerable optical anisotropy while having a high clearing point, a high absolute value of dielectric anisotropy, and a high K value (K0), the liquid crystal composition is designed to achieve these properties. 11 and K 33 The compounds of general formula N are selected from the group consisting of compounds of general formula N-2, general formula N-5, general formula N-14, general formula N-16, general formula N-22, and general formula N-25, which have lower rotational viscosity, shorter response time, higher transmittance, higher contrast and longer low-temperature storage time.

[0106] In some embodiments of the present invention, it is preferable to adjust the content of the compound of general formula N so that the liquid crystal composition containing it has a higher clearing point, a higher absolute value of dielectric anisotropy, and a higher K value (K0) while maintaining considerable optical anisotropy. 11 and K 33 It has lower rotational viscosity, shorter response time, higher transmittance, higher contrast, and longer low-temperature storage time.

[0107] In some embodiments of the invention, the compound of general formula N accounts for 0.1% to 60% by weight of the liquid crystal composition (inclusive of any value or subrange within this range), for example, 0.1%, 1%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, 50%, 52%, 54%, 56%, 58%, 60%, or a range between any two of these values.

[0108] In some embodiments of the present invention, the liquid crystal composition comprises at least one compound of general formula L:

[0109]

[0110] in,

[0111] R L1 and R L2Each of these terms independently represents a straight-chain alkyl group containing 1-12 (e.g., 2, 3, 4, 5, 6, 7, 8, 9, 10, or 11) carbon atoms, or a branched alkyl group containing 3-12 (e.g., 4, 5, 6, 7, 8, 9, 10, or 11) carbon atoms. or One or more of the -CH2- groups of straight-chain alkyl groups containing 1-12 carbon atoms or branched alkyl groups containing 3-12 carbon atoms may be independently replaced by -O-, -CO-, -CO-O- or -O-CO-.

[0112] ring and ring Each represents independently or in One or more -CH2- bonds can be replaced by -O- bonds, and one or more single bonds in the ring can be replaced by double bonds, wherein One or more -H can be replaced by -F, -Cl or -CN, and one or more -CH= in a ring can be replaced by -N=;

[0113] Z L1 and Z L2 Each can independently represent a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, -CF2CF2-, -(CH2)4-, -CF2O-, or -OCF2-;

[0114] n L1 Indicates 1, 2, or 3, n L2 Represents 0 or 1, and 0 < n L1 +n L2 ≤3, when n L1 When = 2 or 3, the ring They can be the same or different, Z L1 They can be the same or different; and

[0115] At least one ring express or

[0116] In some embodiments of the present invention, the compounds of general formula L are selected from the group consisting of the following compounds:

[0117]

[0118] as well as

[0119]

[0120] In some embodiments of the present invention, preferably, R L1 and R L2 Each of these terms independently represents a straight-chain alkyl group containing 1-10 carbon atoms, a branched alkyl group containing 3-10 carbon atoms, a straight-chain alkoxy group containing 1-9 carbon atoms, or a branched alkoxy group containing 3-9 carbon atoms; more preferably, R N1 and R N2 Each can be independently represented as a straight-chain alkyl group containing 1-8 carbon atoms, or a straight-chain alkoxy group containing 1-7 carbon atoms.

[0121] In some embodiments of the present invention, in order to maintain a considerable optical anisotropy while having a high clearing point, a high absolute value of dielectric anisotropy, and a high K value (K0), the liquid crystal composition is designed to achieve these properties. 11 and K 33 The compounds of general formula L are selected from the group consisting of compounds of general formula L-1 and general formula L-3, and have lower rotational viscosity, shorter response time, higher transmittance, higher contrast and longer low-temperature storage time.

[0122] In some embodiments of the present invention, it is preferable to adjust the content of the compound of general formula L so that the liquid crystal composition containing it has a higher clearing point, a higher absolute value of dielectric anisotropy, and a higher K value (K0) while maintaining considerable optical anisotropy. 11 and K 33 It has lower rotational viscosity, shorter response time, higher transmittance, higher contrast, and longer low-temperature storage time.

[0123] In some embodiments of the present invention, the compound of general formula L accounts for 0.1% to 30% by weight of the liquid crystal composition (inclusive of any value or subrange within this range), for example, 0.1%, 1%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, or a range between any two of these values.

[0124] In some embodiments of the present invention, the liquid crystal composition of the present invention comprises at least one polymerizable compound of general formula RM:

[0125]

[0126] in,

[0127] R1 represents -H, halogen, -CN, -Sp2-P2, a straight-chain alkyl group containing 1-12 (e.g., 2, 3, 4, 5, 6, 7, 8, 9, 10, or 11) carbon atoms, or a branched alkyl group containing 3-12 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, or 11) carbon atoms. or Among them are straight-chain alkyl groups containing 1-12 carbon atoms, and branched alkyl groups containing 3-12 carbon atoms. or 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;

[0128] ring and ring Each represents independently or in and One or more -CH2- bonds can be replaced by -O- bonds, and one or more single bonds in the ring can be replaced by double bonds, wherein and One or more -H atoms may be independently replaced by -F, -Cl, -CN, -Sp3-P3, a halogenated or unhalogenated straight-chain alkyl group containing 1-12 carbon atoms, or a halogenated or unhalogenated straight-chain alkoxy group containing 1-11 carbon atoms. or Replacement, and in one or more rings -CH= can be replaced by -N=;

[0129] ring express or in or One or more -H atoms may be independently replaced by -F, -Cl, -CN, -Sp3-P3, a halogenated or unhalogenated straight-chain alkyl group containing 1-12 carbon atoms, or a halogenated or unhalogenated straight-chain alkoxy group containing 1-11 carbon atoms. or Replacement, and in one or more rings -CH= can be replaced by -N=;

[0130] P1, P2, and P3 each independently represent polymerizable groups;

[0131] X0 represents -O-, -S-, or -CO-;

[0132] Sp1, Sp2, and Sp3 each independently represent a spacer group or a single bond;

[0133] 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 terms independently represents a straight-chain or branched alkyl group containing 1-12 carbon atoms, and d represents an integer from 1 to 4; and

[0134] 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.

[0135] In some embodiments of the present invention, the polymerizable compound of general formula RM is selected from the group consisting of the following compounds:

[0136]

[0137]

[0138]

[0139] as well as

[0140]

[0141] in,

[0142] X1-X 10 and X 12 Each can independently represent -F, -Cl, -Sp3-P3, or straight-chain alkyl or alkoxy groups containing 1-5 carbon atoms. or

[0143] In some embodiments of the present invention, X1-X 10 and X 12Each can be independently represented as -F, -Cl, -Sp3-P3, -CH3, or -OCH3.

[0144] In some embodiments of the present invention, Sp1 and Sp2 both represent single bonds.

[0145] In some embodiments of the present invention, in order to obtain a suitable clearing point, suitable optical anisotropy, suitable absolute value of dielectric anisotropy, a large K value, a small rotational viscosity, a small residue concentration, a small roughness, and a good alignment effect, the polymerizable compound of general formula RM is selected from the group consisting of compounds of general formula RM-1, compounds of general formula RM-2, and compounds of general formula RM-20.

[0146] 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.

[0147] In some embodiments of the present invention, polymerizable groups P1, P2, and P3 are each independently represented. Or -SH; preferably, 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. or

[0148] In some embodiments of the present invention, the polymerizable compound of general formula RM-1 is selected from the group consisting of the following compounds:

[0149] as well as

[0150]

[0151] As used herein, the term "spacer group" is known to those skilled in the art and is described in the literature (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. A typical spacer group is, 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 these 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. A particularly preferred spacer group is -(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 -

[0152] 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.

[0153] As used in this article, -CO- and -C(O)- both represent carbonyl groups.

[0154] As used herein, the term "containing 1-r carbon atoms" (where r is an integer greater than 1) can mean containing any integer between 1 and r (inclusive), such as containing 2 carbon atoms, (r-1) carbon atoms, or r carbon atoms. For example, "containing 1-12 carbon atoms" can mean containing 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12 carbon atoms.

[0155] As used herein, the term "integer between y1 and y2" can be any integer within that range (including the endpoints y1 and y2). For example, "integer between 0 and 12" can be, for example, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12.

[0156] In some embodiments of the present invention, the liquid crystal composition of the present invention further comprises at least one compound selected from the group consisting of compounds of general formula A-1 and compounds of general formula A-2:

[0157]

[0158] in,

[0159] R A1 and R A2 Each of these terms independently represents a straight-chain alkyl group containing 1-12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, or a branched alkyl group containing 3-12 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms. or One or more of the -CH2- groups in the straight-chain alkyl group containing 1-12 carbon atoms and the branched alkyl group containing 3-12 carbon atoms can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-, and the straight-chain alkyl group containing 1-12 carbon atoms and the branched alkyl group containing 3-12 carbon atoms can be replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-, respectively. or One or more -H can be independently replaced by -F or -Cl;

[0160] ring ring ring and ring Each represents independently or in and One or more -CH2- bonds can be replaced by -O- bonds, and one or more single bonds in the ring can be replaced by double bonds, wherein and One or more -H can be replaced by -F, -Cl or -CN, and one or more -CH= in a ring can be replaced by -N=;

[0161] Z A11 It represents a single bond, -CH2CH2-, -CF2CF2-, -CO-O-, -O-CO-, -O-CO-O-, -CH=CH-, -CF=CF-, -CF2O-, -OCF2-, -CH2O-, or -OCH2-;

[0162] Z A21 and Z A22 Each can independently represent a single bond, -CH2CH2-, -CF2CF2-, -CO-O-, -O-CO-, -O-CO-O-, -CH=CH-, -CF=CF-, -CH2O-, or -OCH2-;

[0163] L A11 L A12 L A13 L A21 and L A22 Each can independently represent -H, halogen, or alkyl group containing 1-3 carbon atoms;

[0164] X A1 and X A2 Each can independently represent a halogen, a haloalkyl or haloalkoxy group containing 1-5 carbon atoms, or a haloalkenyl or haloalkenoxy group containing 2-5 carbon atoms.

[0165] n A11 Represents 0, 1, 2, or 3, where when n A11 When = 2 or 3, the ring They can be the same or different, Z A11 They can be the same or different;

[0166] n A12 Represents 1 or 2, where when n A12 When = 2, ring They can be the same or different; and

[0167] n A2 Represents 0, 1, 2, or 3, where when n A2 When = 2 or 3, the ring They can be the same or different, Z A21 They can be the same or different.

[0168] In some embodiments of the invention, the compound selected from the group consisting of compounds of general formula A-1 and compounds of general formula A-2 accounts for 0.1% to 60% (inclusive of any value within this range) of the weight percentage of the liquid crystal composition, for example, 0.1%, 1%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, 50%, 52%, 54%, 56%, 58%, 60%, or a range between any two of these values.

[0169] In some embodiments of the present invention, the compounds of general formula A-1 are selected from the group consisting of the following compounds:

[0170]

[0171]

[0172]

[0173] as well as

[0174]

[0175] in,

[0176] R A1 Indicates a straight-chain alkyl group containing 1-8 carbon atoms. or One or more non-adjacent -CH2- groups of straight-chain alkyl groups containing 1-8 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-, and one or more -H groups present in these groups may be independently replaced by -F or -Cl.

[0177] R v and R w Each can be represented independently as -CH2- or -O-;

[0178] L A11 L A12 L A11 '、L A12 '、L A14 L A15 L A16 L A17 and L A18 Each can be represented independently as -H or -F;

[0179] L A13 and LA13 Each can be represented independently as -H or -CH3;

[0180] X A1 It indicates -F, -CF3, or -OCF3; and

[0181] v and w each represent 0 or 1 independently.

[0182] In some embodiments of the invention, the compound of general formula A-1 accounts for 0.1% to 50% by weight of the liquid crystal composition (inclusive of any value or subrange within this range), for example, 0.1%, 1%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, 50%, or a range between any two of these values.

[0183] Regarding the preferred content of the compound of general formula A-1, in order to keep the viscosity of the liquid crystal composition of the present invention low and the response speed fast, it is preferable to keep the lower limit value slightly low and the upper limit value slightly low; furthermore, in order to keep the clearing point of the liquid crystal composition of the present invention high and the temperature stability good, it is preferable to keep the lower limit value slightly low and the upper limit value slightly low; in addition, in order to keep the driving voltage low and to increase the absolute value of dielectric anisotropy, it is preferable to keep the lower limit value slightly high and the upper limit value slightly high.

[0184] In some embodiments of the present invention, the compounds of general formula A-2 are selected from the group consisting of the following compounds:

[0185]

[0186]

[0187] as well as

[0188]

[0189] in,

[0190] R A2 It indicates a straight-chain alkyl group containing 1-8 carbon atoms, wherein one or more non-adjacent -CH2- groups may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-, and one or more -H groups present in these groups may be independently replaced by -F or -Cl;

[0191] L A21 LA22 L A23 L A24 and L A25 Each can be independently represented as -H or -F; and

[0192] X A2 It represents -F, -CF3, -OCF3, or -CH2CH2CH=CF2.

[0193] In some embodiments of the invention, the compound of general formula A-2 accounts for 0.1% to 50% (inclusive of any value within this range) of the weight percentage of the liquid crystal composition, for example, 0.1%, 1%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, 50%, or a range between any two of these values.

[0194] Regarding the preferred content of the compound of general formula A-2, in order to keep the viscosity of the liquid crystal composition of the present invention low and the response speed fast, it is preferable to keep the lower limit value slightly low and the upper limit value slightly low; furthermore, in order to keep the clearing point of the liquid crystal composition of the present invention high and the temperature stability good, it is preferable to keep the lower limit value slightly low and the upper limit value slightly low; in addition, in order to keep the driving voltage low and to increase the absolute value of dielectric anisotropy, it is preferable to keep the lower limit value slightly high and the upper limit value slightly high.

[0195] In some embodiments of the present invention, the liquid crystal composition further comprises at least one additive.

[0196] In addition to the compounds mentioned above, the liquid crystal compositions of the present invention may also contain conventional nematic liquid crystals, smectic liquid crystals, cholesterol liquid crystals, dopants, antioxidants, ultraviolet absorbers, infrared absorbers, polymerizable monomers, or light stabilizers.

[0197] The following shows possible dopants that are preferably added to the liquid crystal composition according to the invention:

[0198] as well as

[0199]

[0200] In some embodiments of the present invention, the dopant accounts for 0%-5% of the weight percentage of the liquid crystal composition; preferably, the dopant accounts for 0.01%-1% of the weight percentage of the liquid crystal composition.

[0201] Furthermore, the antioxidants, light stabilizers, ultraviolet absorbers, and other additives used in the liquid crystal composition of the present invention are preferably the following substances:

[0202]

[0203]

[0204]

[0205] Where n represents a positive integer from 1 to 12.

[0206] Preferably, the antioxidant is selected from the compounds listed below:

[0207]

[0208] In some embodiments of the present invention, the additive accounts for 0%-5% of the total weight percentage of the liquid crystal composition; preferably, the additive accounts for 0.01%-1% of the total weight percentage of the liquid crystal composition.

[0209] Even in the absence of a polymerization initiator, the liquid crystal composition containing the polymerizable compound of the present invention can undergo polymerization; however, a polymerization initiator may also be included to promote polymerization. Examples of polymerization initiators include benzoin ethers, benzophenones, acetophenones, benzoin ketals, and phosphine oxides.

[0210] In another aspect, the present invention also provides a liquid crystal display device comprising the above-described liquid crystal composition.

[0211] In some embodiments of the present invention, the above-described liquid crystal composition is particularly suitable for liquid crystal display devices of VA, PSVA, IPS, and NFFS.

[0212] Beneficial effects: Compared with the prior art, the liquid crystal composition of the present invention, while maintaining comparable optical anisotropy, has a higher clearing point, a higher absolute value of dielectric anisotropy, and a higher K value (K0). 11 and K 33 It has lower rotational viscosity, shorter response time, higher transmittance, higher contrast, and longer low-temperature storage time. Detailed Implementation

[0213] The present invention will be described below with reference to specific embodiments. It should be noted that the following embodiments are examples of the present invention and are used only to illustrate the invention, not to limit it. Other combinations and various modifications within the scope of the present invention can be made without departing from its spirit or scope.

[0214] Unless otherwise specified, all proportions in this invention are weight ratios, and all temperatures are in degrees Celsius.

[0215] For ease of explanation, the group structures of each compound in the following embodiments are represented by the codes listed in Table 1:

[0216] Table 1. Group structure codes of compounds

[0217]

[0218]

[0219] Take the following compound with the following structural formula as an example:

[0220]

[0221] 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 substituent.

[0222] The abbreviated codes for the test items in the following examples are as follows:

[0223] Cp (Clearing point, nematic-isotropic phase transition temperature, °C)

[0224] Δn Optical anisotropy (589nm, 20℃)

[0225] Δε dielectric anisotropy (1 kHz, 20 °C)

[0226] K 11 Elastic constant of the stretching curve (20℃)

[0227] K 33 Bending elastic constant (20℃)

[0228] CR contrast

[0229] γ1 Rotational viscosity (mPa·s, 20℃)

[0230] t -40℃ Low-temperature storage time (days, -40℃)

[0231] T r Penetration rate (%)

[0232] τ Response time (ms)

[0233] in,

[0234] Cp: ​​Obtained by testing with a melting point apparatus.

[0235] Δn: Measured using an Abbe refractometer under a sodium lamp (589nm) light source at 20℃.

[0236] 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: 20℃, 1KHz, VA type test box with a thickness of 6μm.

[0237] γ1: Measured using the LCM-2 type liquid crystal property evaluation system; test conditions: 20℃, 160-260V, test cell thickness 20μm.

[0238] K 11 and K 33 The CV curve of the liquid crystal was obtained by testing and calculating using an LCR meter and a VA test cell; test conditions: cell thickness 6μm, V = 0.1~20V, 20℃.

[0239] t -40℃ The time when crystal precipitation is observed is recorded when the nematic liquid crystal medium is placed in a glass bottle and stored at -40°C.

[0240] T r The VT curve of the dimming device was tested using a DMS 505 optoelectronic comprehensive tester. The maximum transmittance on the VT curve was taken as the transmittance of the liquid crystal. The test cell was a negative IPS type with a cell thickness of 3.5μm.

[0241] τ: Measured using a DMS505 tester under the following conditions: 20℃, V100 drive, and a negative IPS test box with a thickness of 3.5μm.

[0242] 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: 20℃ and 3.5μm thickness of negative IPS test box.

[0243] All components used in the following examples can be synthesized using known methods or obtained commercially. These synthesis techniques are conventional, and the resulting liquid crystal compounds have been tested and found to meet electronic compound standards.

[0244] Liquid crystal compositions were prepared according to the proportions specified in the following examples. The liquid crystal compositions were prepared using conventional methods in the art, such as mixing in proportions by heating, ultrasound, or suspension.

[0245] Comparative Example 1

[0246] Liquid crystal compositions were prepared according to the compounds and their weight percentages listed in Table 2, and 0.3% by weight of... and 0.03% by weight The liquid crystal composition shown in Table 2 was added as Comparative Example 1, and its performance was tested by filling it between two substrates of a liquid crystal display.

[0247] Table 2. Formulation and performance parameter test results of liquid crystal compositions

[0248]

[0249] Example 1

[0250] Liquid crystal compositions were prepared according to the compounds and their weight percentages listed in Table 3, and 0.3% by weight of...

[0251] As Example 1, the liquid crystal composition shown in Table 3 was added and filled between two substrates of a liquid crystal display for performance testing.

[0252] Table 3. Formulation and performance parameter test results of the liquid crystal composition.

[0253]

[0254]

[0255] As can be seen from the comparison between Example 1 and Comparative Example 1, while maintaining comparable optical anisotropy, the liquid crystal composition of this application has a higher clearing point, a higher absolute value of dielectric anisotropy, and a higher K value (K0). 11 and K 33 It features lower rotational viscosity, shorter response time, higher transmittance, higher contrast, and longer low-temperature storage time, thus balancing the performance requirements of higher contrast and shorter response speed.

[0256] Comparative Example 2

[0257] Liquid crystal compositions were prepared according to the compounds and their weight percentages listed in Table 4, and 0.3% by weight of... and 0.03% by weight The liquid crystal composition shown in Table 4 was added as Comparative Example 2, and its performance was tested by filling it between two substrates of a liquid crystal display.

[0258] Table 4. Formulation and performance parameter test results of liquid crystal compositions

[0259]

[0260]

[0261] Example 2

[0262] Liquid crystal compositions were prepared according to the compounds and their weight percentages listed in Table 5, and 0.3% by weight of... and 0.03% by weight As Example 2, the liquid crystal composition shown in Table 5 was added and filled between the two substrates of the liquid crystal display for performance testing.

[0263] Table 5. Formulation and performance parameter test results of the liquid crystal composition.

[0264]

[0265] As can be seen from the comparison between Example 2 and Comparative Example 2, while maintaining comparable optical anisotropy, the liquid crystal composition of this application has a higher clearing point, a higher absolute value of dielectric anisotropy, and a higher K value (K0). 11 and K 33 It features lower rotational viscosity, shorter response time, higher transmittance, higher contrast, and longer low-temperature storage time, thus balancing the performance requirements of higher contrast and shorter response speed.

[0266] Example 3

[0267] Liquid crystal compositions were prepared according to the compounds and their weight percentages listed in Table 6, and 0.3% by weight of... and 0.03% by weight As Example 3, the liquid crystal composition shown in Table 6 was added and filled between the two substrates of the liquid crystal display for performance testing.

[0268] Table 6. Formulation and performance parameter test results of the liquid crystal composition

[0269]

[0270] Example 4

[0271] Liquid crystal compositions were prepared according to the compounds and their weight percentages listed in Table 7, and 0.3% by weight of... and 0.03% by weight As Example 4, the liquid crystal composition shown in Table 7 was added and filled between the two substrates of the liquid crystal display for performance testing.

[0272] Table 7. Formulation and performance parameter test results of the liquid crystal composition.

[0273]

[0274] As can be seen from Examples 3 and 4, when the compound of general formula B-1 is selected from one of the compounds of general formulas B-1-4, the liquid crystal composition containing it has a higher clearing point, a higher absolute value of dielectric anisotropy, and a higher K value (K0) while maintaining considerable optical anisotropy. 11 and K 33 It features lower rotational viscosity, shorter response time, higher transmittance, higher contrast, and longer low-temperature storage time, thus balancing the performance requirements of higher contrast and shorter response speed.

[0275] Comparative Example 3

[0276] Liquid crystal compositions were prepared according to the compounds and their weight percentages listed in Table 8, and 0.3% by weight of... And 0.25% by weight As Comparative Example 3, the liquid crystal composition shown in Table 8 was added and filled between two substrates of a liquid crystal display for performance testing.

[0277] Table 8. Formulation and performance parameter test results of the liquid crystal composition.

[0278]

[0279] Example 5

[0280] Liquid crystal compositions were prepared according to the compounds and their weight percentages listed in Table 9, and 0.3% by weight of... And 0.025% by weight As Example 5, the liquid crystal composition shown in Table 9 was added and filled between the two substrates of the liquid crystal display for performance testing.

[0281] Table 9. Formulation and Performance Parameter Test Results of Liquid Crystal Compositions

[0282]

[0283]

[0284] As can be seen from the comparison between Example 5 and Comparative Example 3, while maintaining comparable optical anisotropy, the liquid crystal composition of this application has a higher clearing point, a higher absolute value of dielectric anisotropy, and a higher K value (K0). 11 and K 33 It features lower rotational viscosity, shorter response time, higher transmittance, higher contrast, and longer low-temperature storage time, thus balancing the performance requirements of higher contrast and shorter response speed.

[0285] Example 6

[0286] Liquid crystal compositions were prepared according to the compounds and their weight percentages listed in Table 10, and 0.3% by weight of... and 0.03% by weight As Example 6, the liquid crystal composition shown in Table 10 was added and filled between the two substrates of the liquid crystal display for performance testing.

[0287] Table 10. Formulation and performance parameter test results of liquid crystal compositions

[0288]

[0289]

[0290] Example 7

[0291] Liquid crystal compositions were prepared according to the compounds and their weight percentages listed in Table 11, and 0.3% by weight of... And 0.05% by weight As Example 7, the liquid crystal composition shown in Table 11 was added and filled between the two substrates of the liquid crystal display for performance testing.

[0292] Table 11 Formulation and Performance Parameter Test Results of Liquid Crystal Compositions

[0293]

[0294] In summary, the liquid crystal composition of the present invention, while maintaining considerable optical anisotropy, has a higher clearing point, a higher absolute value of dielectric anisotropy, and a higher K value (K0). 11 and K 33 It features lower rotational viscosity, shorter response time, higher transmittance, higher contrast, and longer low-temperature storage time, thus balancing the performance requirements of higher contrast and shorter response speed.

[0295] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A liquid crystal composition, characterized in that, The liquid crystal composition includes At least one compound of general formula I, said compound of general formula I being selected from the group consisting of: I-1; and I-7； At least one compound of general formula B, said compound of general formula B being selected from the group consisting of: B-1； B-4; and B-5； At least one compound of general formula M, said compound of general formula M being selected from the group consisting of: M-1； M-2； M-3； M-4； M-11； M-12； M-13， At least one compound of general formula N, said compound of general formula N being selected from the group consisting of: N-2； N-5； N-6； N-7； N-10； N-11； N-14； N-16； N-18； N-19； N-21； N-22； N-23； N-24； N-25； in, R 01 The -H, straight-chain alkyl group containing 1-12 carbon atoms, and branched alkyl group containing 3-12 carbon atoms are indicated, wherein one or more non-adjacent -CH2- groups of straight-chain alkyl group containing 1-12 carbon atoms and branched alkyl group containing 3-12 carbon atoms can be independently replaced by -O-. R 02 This indicates a straight-chain alkyl group containing 1-12 carbon atoms or a branched alkyl group containing 3-12 carbon atoms, wherein one or more non-adjacent -CH2- in the straight-chain alkyl group containing 1-12 carbon atoms or the branched alkyl group containing 3-12 carbon atoms can be independently replaced by -CH=CH- or -O-. R B2 The terms "halogen", "halogenated or non-halogenated straight-chain alkyl group" containing 1-12 carbon atoms, and "halogenated or non-halogenated branched alkyl group" containing 3-12 carbon atoms are used to indicate halogens. , , , or One or more of the -CH2- groups, which are halogenated or unhalogenated straight-chain alkyl groups containing 1-12 carbon atoms or halogenated or unhalogenated branched alkyl groups containing 3-12 carbon atoms, may be independently replaced by -CH=CH-, -CH=CF-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-. R B1 'Indicates a straight-chain alkyl or alkoxy group containing 1-8 carbon atoms, or a straight-chain alkenyl or alkenyloxy group containing 2-8 carbon atoms; n 01 Represents 0 or 1; X B Indicates -O- or -S-; X B2 and X B3 Each can be represented independently as -O- or -S-; n B3 Represents integers from 0 to 5; R M1 and R M2 Each can be independently represented as a straight-chain alkyl group containing 1-8 carbon atoms, a straight-chain alkoxy group containing 1-7 carbon atoms, or a straight-chain alkenyl group containing 2-8 carbon atoms; R N1 and R N2 Each of these can be independently represented as a straight-chain alkyl group containing 1-8 carbon atoms, a straight-chain alkoxy group containing 1-7 carbon atoms, or a straight-chain alkenyl group containing 2-8 carbon atoms; and The compound of general formula I accounts for 10%-40% of the weight percentage of the liquid crystal composition; the compound of general formula B accounts for 5%-30% of the weight percentage of the liquid crystal composition; the compound of general formula M accounts for 0.1%-70% of the weight percentage of the liquid crystal composition; and the compound of general formula N accounts for 0.1%-60% of the weight percentage of the liquid crystal composition.

2. The liquid crystal composition according to claim 1, characterized in that, The liquid crystal composition comprises at least one compound of general formula L: L， in, R L1 and R L2 Each can be independently represented as a straight-chain alkyl group containing 1-12 carbon atoms, or a branched alkyl group containing 3-12 carbon atoms. , or One or more non-adjacent -CH2- of a straight-chain alkyl group containing 1-12 carbon atoms or a branched alkyl group containing 3-12 carbon atoms may be independently replaced by -O-, -CO-, -CO-O- or -O-CO-. ring and ring Each represents independently or ,in One or more -CH2- bonds can be replaced by -O- bonds, and one or more single bonds in the ring can be replaced by double bonds, wherein One or more -H can be replaced by -F, -Cl or -CN, and one or more -CH= in a ring can be replaced by -N=; Z L1 and Z L2 Each can independently represent a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, -CF2CF2-, -(CH2)4-, -CF2O-, or -OCF2-; n L1 Indicates 1, 2, or 3, n L2 Represents 0 or 1, and 0 < n L1 +n L2 ≤3, when n L1 When =2 or 3, the ring They can be the same or different, Z L1 They can be the same or different; and At least one ring express , or .

3. The liquid crystal composition according to claim 2, characterized in that, The compounds of general formula L are selected from the group consisting of the following compounds: L-1； L-2； L-3； L-4； L-5； L-6； L-7; and L-8。 4. The liquid crystal composition according to claim 2, characterized in that, The compound of general formula L accounts for 0.1%-30% of the weight percentage of the liquid crystal composition.

5. A liquid crystal display device comprising the liquid crystal composition according to any one of claims 1-4.

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