Negative dielectric liquid crystal composition and liquid crystal display device comprising same

Abstract

The invention provides a negative dielectric liquid crystal composition and a liquid crystal display device comprising the same. The liquid crystal composition comprises at least one compound as shown in a general formula I, at least one compound as shown in a general formula II and at least one compound as shown in a general formula III, wherein the compound as shown in the general formula II is selected from a group consisting of a compound as shown in a general formula II-A and / or a compound as shown in a general formula II-B. According to the present invention, the liquid crystal composition has characteristics of appropriate clearing point, appropriate dielectric anisotropy absolute value and good optical anisotropy, can effectively reduce the rotary viscosity, especially the low-temperature rotary viscosity, of the liquid crystal composition, and can improve the low-temperature response speed of the liquid crystal composition, the liquid crystal composition has the advantages of lower rotary viscosity, higher response speed, higher contrast ratio, larger elastic constant, better low-temperature storage time and wider nematic phase temperature range. # imgabs0 #

Description

Technical Field

[0001] The present invention belongs to the technical field of liquid crystal materials, and particularly relates to a negative dielectric liquid crystal composition and a liquid crystal display device comprising the same. Background Art

[0002] Liquid crystal materials are mixtures of organic rod-shaped small molecule compounds that have the fluidity of a liquid and the anisotropy of a crystal at a certain temperature. Liquid crystal display devices utilize the optical anisotropy and dielectric anisotropy inherent in liquid crystal materials to operate and are currently widely used. Liquid crystal display elements are classified based on the operation mode of liquid crystal molecules into: PC (phase change), TN (twist nematic), STN (super twisted nematic), DS (dynamic scattering), FLC (ferroelectric liquid crystal), GH (guest-host), ECB (electrically controlled birefringence), OCB (optically compensated bend), IPS (in-plane switching), VA (vertical alignment), FFS (fringe field switching), FPA (field-induced photo-reactive alignment), etc.

[0003] With the wide application of TFT (thin film transistor) type liquid crystal displays (LCDs), the requirements for their performance are constantly increasing. High display image quality requires faster response speed, lower power consumption, and higher low-temperature reliability. Additionally, higher contrast and transmittance are also needed. This means that liquid crystal materials need to have higher contrast and transmittance, higher elastic constants, higher dielectric constants, and low-temperature reliability, and improving these properties requires improving the liquid crystal materials.

[0004] The relationship between contrast ratio (CR) and luminance (L) is as follows:

[0005] CR = L 255 / L0 × 100%, where L 255 is the on-state luminance and L0 is the off-state luminance.

[0006] It can be seen that the change of L0 should significantly affect CR; in the off state, L0 is independent of the dielectric of the liquid crystal molecules and is related to the light scattering (LC Scattering) of the liquid crystal material itself. The smaller the LC Scattering, the smaller L0, and thus CR will be significantly improved.

[0007] In addition, the most important factor affecting the contrast of the liquid crystal display element is the light leakage of the liquid crystal material, and the main factor affecting the light leakage is the light scattering (LC Scattering). The relationship between LC Scattering and the average elastic constant K ave is as follows:

[0008] LC Scattering ∝ dΔn 2 (n e +n o ) 2 / K ave , where d represents the spacing of the liquid crystal cell, n e represents the extraordinary light refractive index, and n o represents the ordinary light refractive index. From this relationship, it can be seen that LC Scattering is inversely proportional to K ave , and in the case of increasing K ave , the light leakage of the liquid crystal material can be reduced.

[0009] The response speed is also an important parameter for liquid crystal display devices. The response time: τ off ∝ γ1d 2 / (π 2 K 22 ), where γ1 is the rotational viscosity of the liquid crystal, d is the spacing of the liquid crystal cell in the liquid crystal display device, and K 22 is the liquid crystal related elastic constant; a liquid crystal composition with a small rotational viscosity can improve the response speed of the liquid crystal display element, and a liquid crystal composition with a small low-temperature rotational viscosity can improve the response speed of the liquid crystal display element at low temperatures.

[0010] When the retardation amount Δnd is constant, with a higher optical refractive anisotropy Δn, the display device can achieve a smaller thickness, thereby improving the response speed. When the response speed of the liquid crystal display element is fast, it can be applied to animated displays.

[0011] The elastic constant K value of the liquid crystal composition can affect the change of the driving voltage of the liquid crystal display element.

[0012] The elastic constant K value changes with temperature, and different liquid crystal compositions have different K value change rates.

[0013] From the perspective of the preparation of liquid crystal materials, the various properties of liquid crystal materials are mutually restrictive and affect each other. The improvement of certain performance parameters may cause corresponding changes in other properties. Therefore, developing a liquid crystal composition that has a low rotational viscosity, a fast response speed, a high contrast ratio, a large elastic constant, and better low-temperature storage properties while ensuring appropriate clearing points, appropriate absolute values of dielectric anisotropy, and good optical anisotropy often requires creative labor. Summary of the Invention

[0014] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a negative dielectric liquid crystal composition and a liquid crystal display device comprising the same. In the present invention, on the premise of ensuring appropriate clearing points, appropriate absolute values of dielectric anisotropy, and good optical anisotropy, the liquid crystal composition can effectively reduce the rotational viscosity of the liquid crystal composition, especially the low-temperature rotational viscosity, improve the low-temperature response speed of the liquid crystal composition, so that it has a low rotational viscosity, a fast response speed, a high contrast ratio, a large elastic constant, better low-temperature storage properties, and a wider nematic phase temperature range.

[0015] To achieve this purpose, the present invention adopts the following technical solutions:

[0016] In a first aspect, the present invention provides a negative dielectric liquid crystal composition, which comprises:

[0017] At least one (for example, two, three, four, five) compounds of general formula I

[0018]

[0019] At least one (for example, two, three, four, five) type II compound, and the type II compound is selected from the group consisting of compounds of general formula II-A and / or compounds of general formula II-B:

[0020]

[0021] At least one (for example, two, three, four, five, six) compounds of general formula III:

[0022]

[0023] Wherein,

[0024] R A1represents a straight-chain or branched alkoxy group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms, or a straight-chain or branched alkenyl group containing 2 to 12 (e.g., 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms;

[0025] R A2 represents a straight or branched alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms, One or more non-adjacent -CH2- in the straight or branched alkyl group containing 1 to 12 carbon atoms can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-;

[0026] R B11 , R B21 , R B12 and R B22 Each independently represents a straight chain or branched chain alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms, a straight chain or branched chain alkenyl group containing 2 to 12 (e.g., 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms, One or more non-adjacent -CH2- in the straight or branched alkyl group containing 1 to 12 carbon atoms may be independently replaced by -C≡C-, -O-, -CO-, -CO-O- or -O-CO-, and R B11 and R B21 At least one of them represents a straight or branched alkenyl group containing 2 to 12 carbon atoms, R B12 and R B22 At least one of them represents a straight or branched alkenyl group containing 2 to 12 carbon atoms;

[0027] R N1 and R N2 each independently represents a straight or branched alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms, wherein one or more non-adjacent -CH2- in the straight or branched alkyl group containing 1 to 12 carbon atoms can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-;

[0028] ring and ring Each independently expresses or And the ring And ring At least one represents

[0029] Ring Ring And ring Each independently represents The One or more -CH2- in the said can be replaced by -O-, one or at most two single bonds in the rings can be replaced by double bonds, at least one ring Or ring Represents

[0030] Ring And ring Each independently represents Wherein the One or more -CH2- in the said can be replaced by -O-, wherein the One or more -H in the said can be replaced by -F, -Cl, or -CN, and one or more -CH= in the rings can be replaced by -N=;

[0031] Z N1 And Z N2 Each independently represents a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, -CF2CF2-, -(CH2)4-, -CF2O- or -OCF2-;

[0032] L N1 And L N2 Each independently represents -H, a halogen, an alkyl group containing 1 - 3 (e.g., 1, 2 or 3) carbon atoms, or an alkoxy group containing 1 - 3 (e.g., 1, 2 or 3) carbon atoms;

[0033] n B1 And n B2 Each independently represents 0 or 1;

[0034] n N1 Represents 0, 1, 2 or 3, n N2 Represents 0 or 1, and 0 ≤ n N1 +n N2 ≤ 3; when n N1 Represents 2 or 3, the rings Are the same or different, Z N1 Are the same or different.

[0035] The alkenyl group in the present invention is preferably any one of the groups represented by formula (V1) to formula (V9), particularly preferably formula (V1), formula (V2), formula (V8) or formula (V9). The groups represented by formula (V1) to formula (V9) are as follows:

[0036] Among them, "x" represents a carbon atom in the ring structure to which it is bonded.

[0037] The alkenyloxy group in the present invention is selected from any one of the groups represented by formula (OV1) to formula (OV9), particularly preferably formula (OV1), formula (OV2), formula (OV8) or formula (OV9). The groups represented by formula (OV1) to formula (OV9) are as follows:

[0038]

[0039] Among them, "x" represents a carbon atom in the ring structure to which it is bonded.

[0040] When n N1 = 2, there are two rings in the compound These two rings can have the same structure or different structures. Exemplarily, one can be and the other can be When the present invention relates to the expression "the same or different", it has the same meaning.

[0041] In the present invention, "can be independently substituted by... respectively, can be substituted by..." means that it can be substituted or not substituted, that is, whether substituted or not substituted, it belongs to the protection scope of the present invention. The same applies to "can be independently substituted by... respectively", and the positions of "substituted" and "replaced" can be arbitrary.

[0042] In the present invention, the short straight lines on one or both sides of the group structure represent the access bond and do not represent methyl. For example the short straight lines on both sides.

[0043] In the present invention, the halogen includes fluorine, chlorine, bromine, iodine, etc.; when the same description is involved hereinafter, it has the same meaning.

[0044] In some embodiments of the present invention, the R A1represents a straight-chain alkoxy group having 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched-chain alkoxy group having 3 to 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms, a straight-chain alkenyl group having 2 to 8 (e.g., 2, 3, 4, 5, 6, 7, or 8) carbon atoms, or a branched-chain alkenyl group having 3 to 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms; more preferably, a straight-chain alkoxy group having 1 to 8 carbon atoms or a straight-chain alkenyl group having 2 to 8 carbon atoms.

[0045] In some embodiments of the present invention, the R A2 represents a straight-chain alkyl group having 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched-chain alkyl group having 3 to 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms, a straight-chain alkoxy group having 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched-chain alkoxy group having 3 to 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms, a straight-chain alkenyl group having 2 to 8 (e.g., 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched-chain alkenyl group having 3 to 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms, more preferably, a straight-chain alkyl group having 1 to 8 carbon atoms, a straight-chain alkoxy group having 1 to 8 carbon atoms, a straight-chain alkenyl group having 2 to 8 carbon atoms,

[0046] In some embodiments of the present invention, the compound of Formula I is selected from the group consisting of at least one (e.g., two, three, four, five) of the following compounds:

[0047]

[0048]

[0049] wherein, R A2 represents a straight-chain alkyl group having 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms or a branched-chain alkyl group having 3 to 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms.

[0050] In some embodiments of the present invention, the compound of Formula I is selected from the group consisting of at least one (e.g., two, three, four, five) of the following compounds:

[0051]

[0052] wherein, R A11 represents a straight-chain alkoxy group having 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms;

[0053] R A12 represents an alkenyl group having a straight chain of 2 to 8 (e.g., 2, 3, 4, 5, 6, 7, or 8) carbon atoms;

[0054] R A2 represents an alkyl group having a straight chain of 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms.

[0055] In some embodiments of the present invention, in order to enable the liquid crystal composition to have a lower rotational viscosity, a faster response speed, a higher contrast ratio, a larger elastic constant, and better low-temperature storage stability while ensuring that it has an appropriate clearing point, an appropriate absolute value of dielectric anisotropy, and a good optical anisotropy, the compound of general formula I comprises at least one (e.g., two, three, four, or five) compound selected from the group consisting of the compounds of general formula I-1 and the compounds of general formula I-2.

[0056] In some embodiments of the present invention, in order to enable the liquid crystal composition to have a lower rotational viscosity, a faster response speed, a higher contrast ratio, a larger elastic constant, and better low-temperature storage stability while ensuring that it has an appropriate clearing point, an appropriate absolute value of dielectric anisotropy, and a good optical anisotropy, the compound of general formula I comprises at least one (e.g., two, three, four, or five) compound selected from the group consisting of the compounds of general formula I-1-1, the compounds of general formula I-1-2, the compounds of general formula I-2-1, and the compounds of general formula I-2-2.

[0057] In some embodiments of the present invention, it is preferred to adjust the content of the compound of general formula I so that the liquid crystal composition has a lower rotational viscosity, a faster response speed, a higher contrast ratio, a larger elastic constant, and better low-temperature storage stability while ensuring that it has an appropriate clearing point, an appropriate absolute value of dielectric anisotropy, and a good optical anisotropy.

[0058] In some embodiments of the present invention, the mass percentage content of the compound of general formula I in the liquid crystal composition is 0.1% - 50% (including any value or sub-range within this range), for example, 0.1%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, or the range between any two of these values. Preferably, the mass percentage content of the compound of general formula I is 1% - 30%.

[0059] In some embodiments of the present invention, the mass percentage content of at least one (for example, two, three, four, or five) compound selected from the group consisting of the compounds of general formula I-1 and the compounds of general formula I-2 is 0.1% - 35% (including any value or sub-range within this range), for example, 0.1%, 0.3%, 0.5%, 0.7%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, or the range between any two of these values.

[0060] In some embodiments of the present invention, the mass percentage content of at least one (for example, two, three, four, or five) compound selected from the group consisting of the compounds of general formula I-1-1, the compounds of general formula I-1-2, the compounds of general formula I-2-1, and the compounds of general formula I-2-2 is 1% - 30% (including any value or sub-range within this range), for example, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, or the range between any two of these values.

[0061] In some embodiments of the present invention, the R B11 、R B21 、R B12 and R B22Each independently represents a straight-chain alkyl group having 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched-chain alkyl group having 3 to 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms, a straight-chain alkenyl group having 2 to 8 (e.g., 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched-chain alkenyl group having 3 to 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms, and R B11 and R B21 at least one of which represents a straight-chain alkenyl group having 2 to 8 carbon atoms or a branched-chain alkenyl group having 3 to 8 carbon atoms, R B12 and R B22 at least one of which represents a straight-chain alkenyl group having 2 to 8 carbon atoms or a branched-chain alkenyl group having 3 to 8 carbon atoms; further, said R B11 , R B21 , R B12 and R B22 each independently represents a straight-chain alkyl group having 1 to 5 carbon atoms or a straight-chain alkenyl group having 2 to 5 carbon atoms, and R B11 and R B21 at least one of which represents a straight-chain alkenyl group having 2 to 5 carbon atoms, R B12 and R B22 at least one of which represents a straight-chain alkenyl group having 2 to 5 carbon atoms.

[0062] In some embodiments of the present invention, the class II compound is selected from the group consisting of at least one (e.g., two, three, four, five) of the following compounds:

[0063]

[0064] In some embodiments of the present invention, the class II compound is selected from the group consisting of at least one (e.g., two, three, four, five) of the following compounds:

[0065]

[0066] Wherein,

[0067] R B11 , R B21 , R B12 and R B22 each independently represents a straight-chain or branched-chain alkyl group having 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a straight-chain or branched-chain alkoxy group having 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms,

[0068] RB110 , R B210 , R B120 and R B220 Each independently represents a straight-chain or branched alkenyl group having 2 to 8 (e.g., 2, 3, 4, 5, 6, 7, or 8) carbon atoms.

[0069] In some embodiments of the present invention, in order for the liquid crystal composition to have a lower rotational viscosity, a faster response speed, a higher contrast ratio, a larger elastic constant, and better low-temperature storage stability while ensuring appropriate clearing point, appropriate absolute value of dielectric anisotropy, and good optical anisotropy, the class II compound comprises at least one (e.g., two, three, four, or five) compound selected from the group consisting of compounds of general formula II-A-1, compounds of general formula II-A-2, compounds of general formula II-A-3, and compounds of general formula II-B-1.

[0070] In some embodiments of the present invention, in order for the liquid crystal composition to have a lower rotational viscosity, a faster response speed, a higher contrast ratio, a larger elastic constant, and better low-temperature storage stability while ensuring appropriate clearing point, appropriate absolute value of dielectric anisotropy, and good optical anisotropy, the class II compound comprises at least one (e.g., two, three, four, or five) compound selected from the group consisting of compounds of general formula II-A-1-1, compounds of general formula II-A-2-2, compounds of general formula II-A-3-1, compounds of general formula II-A-3-2, and compounds of general formula II-B-1-2.

[0071] In some embodiments of the present invention, it is preferred to adjust the content of the class II compound so that the liquid crystal composition has a lower rotational viscosity, a faster response speed, a higher contrast ratio, a larger elastic constant, and better low-temperature storage stability while ensuring appropriate clearing point, appropriate absolute value of dielectric anisotropy, and good optical anisotropy.

[0072] In some embodiments of the present invention, the mass percentage content of the class II compound in the liquid crystal composition is 0.1% - 40% (including any value or sub-range within this range), e.g., 0.1%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, or the range between any two of these values. Preferably, the mass percentage content of the compound of general formula II is 1% - 30%.

[0073] In some embodiments of the present invention, the mass percentage content of at least one (e.g., two, three, four, or five) compound selected from the group consisting of the compounds of general formula II-A-1, the compounds of general formula II-A-2, the compounds of general formula II-A-3, and the compounds of general formula II-B-1 is 0.1%-35% (including any value or sub-range within this range), for example, 0.1%, 0.3%, 0.5%, 0.7%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, or the range between any two of these values.

[0074] In some embodiments of the present invention, the mass percentage content of at least one (e.g., two, three, four, or five) compound selected from the group consisting of the compounds of general formula II-A-1-1, the compounds of general formula II-A-2-2, the compounds of general formula II-A-3-1, the compounds of general formula II-A-3-2, and the compounds of general formula II-B-1-2 is 1%-30% (including any value or sub-range within this range), for example, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, or the range between any two of these values.

[0075] In some embodiments of the present invention, said R N1 and R N2 each independently represents a straight-chain alkyl group having 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched-chain alkyl group having 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms, a straight-chain alkoxy group having 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched-chain alkoxy group having 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms, a straight-chain alkenyl group having 2-8 (e.g., 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched-chain alkenyl group having 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms.

[0076] In some embodiments of the present invention, said Z N1 and Z N2Each independently represents a single bond, -CO-O-, -CH2O-, -OCH2-, -CH=CH-, -CH2CH2-, or -(CH2)4-.

[0077] In some embodiments of the present invention, the L N1 and L N2 both represent -H.

[0078] In some embodiments of the present invention, the compound of general formula III is selected from the group consisting of at least one (e.g., two, three, four, five) of the following compounds:

[0079]

[0080]

[0081]

[0082]

[0083]

[0084] In some embodiments of the present invention, in order for the liquid crystal composition to have a lower rotational viscosity, a faster response speed, a higher contrast, a larger elastic constant, and better low-temperature storage properties on the premise of ensuring that it has an appropriate clearing point, an appropriate absolute value of dielectric anisotropy, and good optical anisotropy, the compound of general formula III comprises at least one (e.g., two, three, four, or five) compound selected from the group consisting of the compound of general formula III-1, the compound of general formula III-2, the compound of general formula III-7, the compound of general formula III-15, the compound of general formula III-16, the compound of general formula III-21, and the compound of general formula III-27.

[0085] In some embodiments of the present invention, the compound of general formula III is selected from the group consisting of at least one (e.g., two, three, four, five) of the following compounds:

[0086]

[0087]

[0088] Wherein, R N11 and R N21Each independently represents a straight-chain alkyl group having 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched-chain alkyl group having 3 to 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms, a straight-chain alkoxy group having 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, or a branched-chain alkoxy group having 3 to 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms;

[0089] R N12 represents a straight-chain alkenyl group having 2 to 8 (e.g., 2, 3, 4, 5, 6, 7, or 8) carbon atoms or a straight-chain alkenyl group having 3 to 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms.

[0090] In some embodiments of the present invention, R N11 represents a straight-chain alkyl group having 1 to 5 carbon atoms or a straight-chain alkoxy group having 1 to 5 carbon atoms.

[0091] In some embodiments of the present invention, R N21 represents a straight-chain alkoxy group having 1 to 5 carbon atoms.

[0092] In some embodiments of the present invention, R N12 represents a straight-chain alkenyl group having 2 to 5 carbon atoms.

[0093] In some embodiments of the present invention, in order to enable the liquid crystal composition to have a lower rotational viscosity, a faster response speed, a higher contrast ratio, a larger elastic constant, and better low-temperature storage stability on the premise of ensuring appropriate clearing point, appropriate absolute value of dielectric anisotropy, and better optical anisotropy, the compound of General Formula III contains at least one (e.g., two, three, four, or five) compound selected from the group consisting of the compounds of General Formula III-1A, General Formula III-2A, General Formula III-7A, General Formula III-15A, General Formula III-16A, General Formula III-21A, General Formula III-21B, and General Formula III-27A.

[0094] In some embodiments of the present invention, it is preferred to adjust the content of the compound of General Formula III so that the liquid crystal composition has a lower rotational viscosity, a faster response speed, a higher contrast ratio, a larger elastic constant, and better low-temperature storage stability on the premise of ensuring appropriate clearing point, appropriate absolute value of dielectric anisotropy, and better optical anisotropy.

[0095] In some embodiments of the present invention, the mass percentage content of the compound of general formula III in the liquid crystal composition is 0.1% - 70% (including any value or sub-range within this range), for example, 0.1%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 62%, 64%, 66%, 68%, 70%, or the range between any two of these values. Preferably, the mass percentage content of the compound of general formula II is 1% - 55%.

[0096] In some embodiments of the present invention, the mass percentage content of at least one (e.g., two, three, four, or five) compound selected from the group consisting of the compound of general formula III-1, the compound of general formula III-2, the compound of general formula III-7, the compound of general formula III-15, the compound of general formula III-16, the compound of general formula III-21, and the compound of general formula III-27 is 0.1% - 55% (including any value or sub-range within this range), for example, 0.1%, 0.3%, 0.5%, 0.7%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, or the range between any two of these values.

[0097] In some embodiments of the present invention, the mass percentage content of at least one (e.g., two, three, four, or five) compound selected from the group consisting of compounds of general formula III-1A, compounds of general formula III-2A, compounds of general formula III-7A, compounds of general formula III-15A, compounds of general formula III-16A, compounds of general formula III-21A, compounds of general formula III-21B, and compounds of general formula III-27A is 1% - 55% (including any value or sub-range within this range), for example, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, or the range between any two of these values.

[0098] In some embodiments of the present invention, the liquid crystal composition further comprises at least one (e.g., two, three, four, five) M-type compound, and the M-type compound is selected from the group consisting of compounds of general formula M1, compounds of general formula M2, and compounds of general formula M3:

[0099]

[0100] Wherein, R M1 、R M2 、R M3 、R M4 、R M5 and R M6 are each independently selected from linear or branched alkyl groups containing 1 - 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, one or more non-adjacent -CH2- in the linear or branched alkyl group containing 1 - 12 carbon atoms can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO- respectively;

[0101] Z M1 、Z M2 、Z M3 、Z M4 and Z M5Each independently represents a single bond, -CH2CH2-, -(CH2)4-, -CF2CF2-, -CO-O-, -O-CO-, -O-CO-O-, -CH=CH-, -CF=CF-, -CF2O-, -OCF2-, -CH2O- or -OCH2-;

[0102] ring and ring each independently represents or the one or more -CH2- in can be replaced by -O-; when ring and ring are both R M1 and R M2 are not alkenyl;

[0103] ring and ring each independently represents the one or more -CH2- in can be replaced by -O-, and at most one -H in the can be replaced by a halogen;

[0104] ring represents the one or more -CH2- in can be replaced by -O-, one or at most two single bonds in the ring can be replaced by double bonds, and at most one -H in the can be replaced by a halogen;

[0105] ring and ring each independently represents the one or more -CH2- in can be replaced by -O-, one or at most two single bonds in the ring can be replaced by double bonds;

[0106] n M represents 1, 2 or 3; when n M = 2 or 3, rings are the same or different, and Z M5 are the same or different.

[0107] In some embodiments of the present invention, the R M1 , R M2 , R M3 , R M4 , R M5 and R M6Each independently selected from a straight-chain alkyl group having 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched-chain alkyl group having 3 to 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms, a straight-chain alkenyl group having 2 to 8 (e.g., 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched-chain alkenyl group having 3 to 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms, a straight-chain alkoxy group having 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched-chain alkoxy group having 3 to 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms,

[0108] In some embodiments of the present invention, the Z M1 、Z M2 、Z M3 、Z M4 and Z M5 each independently represents a single bond, -CH2CH2-, -(CH2)4-, -CO-O-, -CH=CH-, -CH2O- or -OCH2-.

[0109] In some embodiments of the present invention, the n M represents 1 or 2.

[0110] In some embodiments of the present invention, the M-type compounds are selected from the group consisting of at least one (e.g., two, three, four, five) of the following compounds:

[0111]

[0112]

[0113]

[0114]

[0115] wherein, R M11 、R M21 、R M31 and R M41 each independently represents a straight-chain alkyl group having 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched-chain alkyl group having 3 to 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms, a straight-chain alkoxy group having 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms or a branched-chain alkoxy group having 3 to 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms;

[0116] R M1 、R M2 、R M3 、RM4 , R M5 and R M6 each independently represents a straight-chain alkyl group having 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched-chain alkyl group having 3 to 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms, a straight-chain alkoxy group having 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched-chain alkoxy group having 3 to 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms, a straight-chain alkenyl group having 2 to 8 (e.g., 2, 3, 4, 5, 6, 7, or 8) carbon atoms, or a branched-chain alkenyl group having 3 to 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms.

[0117] In some embodiments of the present invention, the M-type compounds are selected from the group consisting of at least one (e.g., two, three, four, or five) of the following compounds:

[0118]

[0119] wherein, R M1 and R M2 each independently represents a straight-chain alkyl group having 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms;

[0120] R M11 and R M21 each independently represents a straight-chain alkyl group having 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms;

[0121] R M20 represents a straight-chain alkenyl group having 2 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms; and

[0122] R M200 represents a straight-chain alkoxy group having 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms.

[0123] In some embodiments of the present invention, in order to enable the liquid crystal composition to have a lower rotational viscosity, a faster response speed, a higher contrast ratio, a larger elastic constant, and better low-temperature storage stability on the premise of ensuring appropriate clearing point, appropriate absolute value of dielectric anisotropy, and good optical anisotropy, the M-type compounds include at least one (e.g., two, three, four, or five) of the compounds selected from the group consisting of the compounds of general formula M1, the compounds of general formula M2, and the compounds of general formula M3.

[0124] In some embodiments of the present invention, in order to enable the liquid crystal composition to have a lower rotational viscosity, a faster response speed, a higher contrast ratio, a larger elastic constant, and better low-temperature storage properties on the premise of ensuring appropriate clearing points, appropriate absolute values of dielectric anisotropy, and better optical anisotropy, the M-type compound comprises at least one (for example, two, three, four, or five) compound selected from the group consisting of compounds of general formula M1-1, compounds of general formula M1-5, and compounds of general formula M1-10.

[0125] In some embodiments of the present invention, in order to enable the liquid crystal composition to have a lower rotational viscosity, a faster response speed, a higher contrast ratio, a larger elastic constant, and better low-temperature storage properties on the premise of ensuring appropriate clearing points, appropriate absolute values of dielectric anisotropy, and better optical anisotropy, the M-type compound comprises at least one (for example, two, three, four, or five) compound selected from the group consisting of compounds of general formula M1-1-1, compounds of M1-1-2, compounds of general formula M1-5-2, and compounds of general formula M1-10.

[0126] In some embodiments of the present invention, it is preferable to adjust the content of the M-type compound so that the liquid crystal composition has a lower rotational viscosity, a faster response speed, a higher contrast ratio, a larger elastic constant, and better low-temperature storage properties on the premise of ensuring appropriate clearing points, appropriate absolute values of dielectric anisotropy, and better optical anisotropy.

[0127] In some embodiments of the present invention, the mass percentage content of the M-type compound in the liquid crystal composition is 0.1%-80% (including any value or sub-range within this range), for example, 0.1%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, or the range between any two of these values. Preferably, the mass percentage content of the M-type compound is 1%-55%.

[0128] In some embodiments of the present invention, the mass percentage content of at least one (e.g., two, three, four, or five) compound selected from the group consisting of compounds of general formula M1-1, compounds of general formula M1-5, and compounds of general formula M1-10 is 1% - 60% (including any value or sub-range within this range), for example, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, or the range between any two of these values.

[0129] In some embodiments of the present invention, the mass percentage content of at least one (e.g., two, three, four, or five) compound selected from the group consisting of compounds of general formula M1-1-1, compounds of general formula M1-1-2, compounds of general formula M1-5-2, and compounds of general formula M1-10 is 1% - 55% (including any value or sub-range within this range), for example, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, or the range between any two of these values.

[0130] In addition to the above compounds, the liquid crystal composition of the present invention may also contain any one or a combination of at least two of ordinary nematic liquid crystals, smectic liquid crystals, cholesteric liquid crystals, polymerizable monomers, and additives.

[0131] In a preferred technical solution, the liquid crystal composition further includes at least one additive.

[0132] In a preferred technical solution, the additive includes any one or a combination of at least two of a dopant, an antioxidant, an ultraviolet absorber, an infrared absorber, and a light stabilizer.

[0133] The following shows the possible dopants preferably added to the liquid crystal composition of the present invention:

[0134]

[0135]

[0136] Among them, * represents a chiral site.

[0137] In some embodiments of the present invention, the mass percentage content of the dopant in the liquid crystal composition is 0%-5%, such as 0%, 0.1%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, etc.; preferably, the mass percentage content of the dopant in the liquid crystal composition is 0.01%-1%.

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

[0139]

[0140]

[0141]

[0142]

[0143] Among them, n represents a positive integer from 1 to 12; n2 represents a positive integer from 1 to 18; " + " represents a free radical.

[0144] Preferably, the light stabilizer is selected from the light stabilizers shown below:

[0145]

[0146] In some embodiments of the present invention, the total mass percentage content of the additive in the liquid crystal composition is 0-5%, such as 0%, 0.1%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, etc.; preferably 0.01-1%.

[0147] In a second aspect, the present invention provides a liquid crystal display device, and the liquid crystal display device includes the liquid crystal composition according to the first aspect.

[0148] In a preferred technical solution, the liquid crystal display device is any one of a VA display mode, a PSVA display mode, an IPS display mode, and an NFFS display mode.

[0149] The numerical ranges described in the present invention include not only the above-listed point values, but also any point values between the above numerical ranges that are not listed. Due to space limitations and for the sake of brevity, the present invention does not exhaustively list the specific point values included in the said ranges.

[0150] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0151] The liquid crystal composition provided by the present invention is compounded with compounds having a specific structure. On the premise of ensuring that it has an appropriate clearing point, an appropriate absolute value of dielectric anisotropy, and good optical anisotropy, it can effectively reduce the rotational viscosity of the liquid crystal composition, especially the low-temperature rotational viscosity, so that it has a low rotational viscosity, a fast response speed, a high contrast ratio, a large elastic constant, and a better low-temperature storage time, and is applicable to fast-response display modes such as VA, PSVA, IPS, and NFFS. Detailed implementation manners

[0152] The technical solutions of the present invention will be further described below through specific implementation manners. Those skilled in the art should understand that the said embodiments are only for helping to understand the present invention and should not be regarded as specific limitations on the present invention.

[0153] For the sake of convenience of expression, in the following examples and comparative examples, the group structures of each compound are represented by the codes listed in Table 1:

[0154] Table 1

[0155]

[0156] Taking the compound with the following structural formula as an example:

[0157]

[0158] If this structural formula is represented by the codes listed in Table 1, it can be expressed as: nCCGF. In the code, n represents the number of C atoms of the alkyl group at the left end. For example, when n is "3", it means that the alkyl group is -C3H7; C in the code represents 1,4-cyclohexylene, G represents 2-fluoro-1,4-phenylene, and F represents fluorine.

[0159] The abbreviated codes for the test items in the embodiments of the present invention are as follows:

[0160]

[0161] Among them,

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

[0163] Δn: Δn = n e -n o, measured using an Abbe refractometer under a sodium lamp (589 nm) light source at 25 °C.

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

[0165] K ave : where K 11 , K 22 and K 33 are obtained by testing the capacitance-voltage characteristic curve (C-V curve) of the liquid crystal material using an LCR meter and an anti-parallel friction cell, test conditions: VA type test cell, cell thickness 6 μm, V = 0.1 - 20 V, Kave = 1 / 3(K

[0166] + K 11 + K 22 + K 33 ).

[0167] CR: The transmittance of the liquid crystal cell, i.e., T r255 and T r0 , are respectively measured using a DMS 505 tester at 255 gray-scale voltage and 0 gray-scale voltage, and obtained from T r255 / T r0 , FFS type test cell with cell thickness 3.0 μm, V = 0 - 20 V.

[0168] γ1 at 25 °C: Measured using a TOYO6254 type liquid crystal physical property evaluation system; test conditions: 25 °C, 90 V, test cell thickness 20 μm.

[0169] τd at 25 °C: τd(25 °C) = γ1(25 °C) * d 2 / K 22 * π 2 .

[0170] γ1 at -10 °C: Measured using a TOYO6254 type liquid crystal physical property evaluation system; test conditions: -10 °C, 90 V, test cell thickness 20 μm.

[0171] τd at -10 °C: τd(-10 °C) = γ1(-10 °C) * d 2 / K 22 * π 2 .

[0172] LTS (-40°C): The time recorded when the nematic liquid crystal medium is placed in a glass bottle, stored at a constant temperature of -40°C, and crystals are observed to precipitate.

[0173] Comparative Example 1

[0174] The liquid crystal composition DB-1 of Comparative Example 1 was prepared according to the compounds listed in Table 2 and their mass percentage contents in the liquid crystal composition, and it was filled between the two substrates of the liquid crystal display for performance testing.

[0175] Table 2 Formulation and Performance Parameter Test Results of Liquid Crystal Composition DB-1

[0176]

[0177]

[0178] Comparative Example 2

[0179] The liquid crystal composition DB-2 of Comparative Example 2 was prepared according to the compounds listed in Table 3 and their mass percentage contents in the liquid crystal composition, and it was filled between the two substrates of the liquid crystal display for performance testing.

[0180] Table 3 Formulation and Performance Parameter Test Results of Liquid Crystal Composition DB-2

[0181]

[0182] Example 1

[0183] The liquid crystal composition B-1 of Example 1 was prepared according to the compounds listed in Table 4 and their mass percentage contents in the liquid crystal composition, and it was filled between the two substrates of the liquid crystal display for performance testing.

[0184] Table 4 Formulation and Performance Parameter Test Results of Liquid Crystal Composition B-1

[0185]

[0186] Example 2

[0187] The liquid crystal composition B-2 of Example 2 was prepared according to the compounds listed in Table 5 and their mass percentage contents in the liquid crystal composition, and it was filled between the two substrates of the liquid crystal display for performance testing.

[0188] Table 5 Formulation and Performance Parameter Test Results of Liquid Crystal Composition B-2

[0189]

[0190] Example 3

[0191] The liquid crystal composition B-3 of Example 3 was prepared according to the compounds listed in Table 6 and their mass percentages in the liquid crystal composition, and it was filled between two substrates of a liquid crystal display for performance testing.

[0192] Table 6 Formulation of Liquid Crystal Composition B-3 and Test Results of Performance Parameters

[0193]

[0194] Example 4

[0195] The liquid crystal composition B-4 of Example 4 was prepared according to the compounds listed in Table 7 and their mass percentages in the liquid crystal composition, and it was filled between two substrates of a liquid crystal display for performance testing.

[0196] Table 7 Formulation of Liquid Crystal Composition B-4 and Test Results of Performance Parameters

[0197]

[0198]

[0199] Example 5

[0200] The liquid crystal composition B-5 of Example 5 was prepared according to the compounds listed in Table 8 and their mass percentages in the liquid crystal composition, and it was filled between two substrates of a liquid crystal display for performance testing.

[0201] Table 8 Formulation of Liquid Crystal Composition B-5 and Test Results of Performance Parameters

[0202]

[0203] Example 6

[0204] The liquid crystal composition B-6 of Example 6 was prepared according to the compounds listed in Table 9 and their mass percentages in the liquid crystal composition, and it was filled between two substrates of a liquid crystal display for performance testing.

[0205] Table 9 Formulation of Liquid Crystal Composition B-6 and Test Results of Performance Parameters

[0206]

[0207]

[0208] Example 7

[0209] The liquid crystal composition B-7 of Example 7 was prepared according to the compounds listed in Table 10 and their mass percentages in the liquid crystal composition, and it was filled between two substrates of a liquid crystal display for performance testing.

[0210] Formulation of Liquid Crystal Composition B-7 and Test Results of Performance Parameters

[0211]

[0212] Example 8

[0213] The liquid crystal composition B-8 of Example 8 was formulated according to the compounds listed in Table 11 and their mass percentage contents in the liquid crystal composition, and it was filled between two substrates of a liquid crystal display for performance testing.

[0214] Formulation of Liquid Crystal Composition B-8 and Test Results of Performance Parameters

[0215]

[0216]

[0217] Example 9

[0218] The liquid crystal composition B-9 of Example 9 was formulated according to the compounds listed in Table 12 and their mass percentage contents in the liquid crystal composition, and it was filled between two substrates of a liquid crystal display for performance testing.

[0219] Formulation of Liquid Crystal Composition B-9 and Test Results of Performance Parameters

[0220]

[0221] Example 10

[0222] The liquid crystal composition B-10 of Example 10 was formulated according to the compounds listed in Table 13 and their mass percentage contents in the liquid crystal composition, and it was filled between two substrates of a liquid crystal display for performance testing.

[0223] Formulation of Liquid Crystal Composition B-10 and Test Results of Performance Parameters

[0224]

[0225]

[0226] From Comparative Examples 1 and 2 and Examples 1-10, it can be seen that the liquid crystal composition provided by the present invention, through the compounding of specific structures and contents of compounds, while ensuring that it has an appropriate clearing point (Cp: 76-83 °C), an appropriate absolute value of dielectric anisotropy (Δε: 1.8-3), and good optical anisotropy (Δn: 0.105-0.114), can effectively reduce the rotational viscosity of the liquid crystal composition, especially the low-temperature rotational viscosity, improve the low-temperature response speed of the liquid crystal composition, so that it has a low rotational viscosity (γ1(25 °C): 83-103 mPa·s; γ1(-10 °C): 128.3-170 mPa·s), a fast response speed (τd(25 °C): 13.8-19.1 ms; τd(-10 °C): 61.7-86.3 ms), a high contrast ratio (CR: 1700-2100), a large elastic constant (K ave : 13.3-15.1), and better low-temperature storage stability (≥15 days at -40 °C), and is applicable to fast-response display modes such as VA, PSVA, IPS, and NFFS.

[0227] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A negative dielectric liquid crystal composition, characterized in that, The liquid crystal composition comprises: at least one compound of general formula I at least one type II compound selected from the group consisting of compounds of general formula II-A and / or compounds of general formula II-B: at least one compound of general formula III: wherein, R A1 represents a straight-chain or branched alkoxy group having 1 to 12 carbon atoms, or a straight-chain or branched alkenyl group having 2 to 12 carbon atoms; R A2 represents an alkyl group having a straight or branched chain of 1 to 12 carbon atoms, one or more non-adjacent -CH2- in the straight or branched alkyl group having 1 to 12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO- respectively; R B11 、R B21 、R B12 and R B22 each independently represents a straight-chain or branched-chain alkyl group having 1 to 12 carbon atoms, a straight-chain or branched-chain alkenyl group having 2 to 12 carbon atoms, in the straight-chain or branched-chain alkyl group having 1 to 12 carbon atoms, one or more non-adjacent -CH2- can be independently replaced by -C≡C-, -O-, -CO-, -CO-O- or -O-CO-, and R B11 and R B21 at least one of which represents a straight-chain or branched-chain alkenyl group having 2 to 12 carbon atoms, R B12 and R B22 at least one of which represents a straight-chain or branched-chain alkenyl group having 2 to 12 carbon atoms; R N1 and R N2 each independently represents a straight-chain or branched-chain alkyl group having 1 to 12 carbon atoms, wherein one or more non-adjacent -CH2- in the straight-chain or branched-chain alkyl group having 1 to 12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-; Ring and the ring each independently represents and the ring and the ring at least one of which represents Ring Ring and Ring each independently represents the one or more of the -CH2- in can be replaced by -O-, one or at most two single bonds in the rings can be replaced by double bonds, and at least one ring or Ring represents Ring and the ring each independently represents wherein one or more of the -CH2- in may be replaced by -O-, wherein one or more of the -H in may be replaced by -F, -Cl, or -CN, and one or more -CH= in the rings may be replaced by -N=; Z N1 and Z N2 each independently represents a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, -CF2CF2-, -(CH2)4-, -CF2O- or -OCF2-; L N1 and L N2 each independently represents -H, a halogen, an alkyl group having 1 to 3 carbon atoms, or an alkoxy group having 1 to 3 carbon atoms; n B1 and n B2 each independently represents 0 or 1; n N1 represents 0, 1, 2 or 3, n N2 represents 0 or 1, and 0 ≤ n N1 + n N2 ≤ 3; when n N1 represents 2 or 3, the rings are the same or different, Z N1 are the same or different.

2. The liquid crystal composition according to claim 1, characterized in that, the mass percentage content of the compound of general formula I in the liquid crystal composition is 0.1% - 50%; the mass percentage content of the type II compound in the liquid crystal composition is 0.1% - 40%; the mass percentage content of the compound of general formula III in the liquid crystal composition is 0.1% - 70%.

3. The liquid crystal composition according to claim 1, wherein The liquid crystal composition further comprises at least one type M compound selected from the group consisting of at least one of compounds of general formula M1, compounds of general formula M2, and compounds of general formula M3: Among them, R M1 , R M2 , R M3 , R M4 , R M5 and R M6 are each independently selected from straight-chain or branched-chain alkyl groups having 1 to 12 carbon atoms, one or more non-adjacent -CH2- in the straight-chain or branched-chain alkyl group having 1 to 12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO- respectively; Z M1 、Z M2 、Z M3 、Z M4 and Z M5 each independently represents a single bond, -CH2CH2-, -(CH2)4-, -CF2CF2-, -CO-O-, -O-CO-, -O-CO-O-, -CH=CH-, -CF=CF-, -CF2O-, -OCF2-, -CH2O- or -OCH2-; Ring and the ring each independently represents the one or more -CH2- in the above can be replaced by -O-; when the ring and the ring are both R M1 and R M2 are not alkenyl; Ring and the ring each independently represent the one or more of -CH2- in may be replaced by -O-, and the at most one -H in may be replaced by a halogen; Ring represents the one or more of the -CH2- in may be replaced by -O-, and the single bond in one or at most two rings may be replaced by a double bond, the at most one -H in may be replaced by a halogen; Ring and the ring each independently represents said one or more of the -CH2- in may be replaced by -O-, and the single bond in one or at most two rings may be replaced by a double bond; n M represents 1, 2 or 3; when n M = 2 or 3, the rings are the same or different, Z M5 are the same or different; the mass percentage content of the type M compound in the liquid crystal composition is 0.1% - 80%.

4. The liquid crystal composition according to claim 1, wherein The compound of general formula I is selected from the group consisting of at least one of the following compounds: and Among them, R A2 represents a straight-chain alkyl group having 1 to 8 carbon atoms or a branched-chain alkyl group having 3 to 8 carbon atoms.

5. The liquid crystal composition according to claim 4, wherein The compound of general formula I is selected from the group consisting of at least one of the following compounds: and Among them, R A11 represents a straight-chain alkoxy group having 1 to 8 carbon atoms; R A12 represents a straight-chain alkenyl group having 2 to 8 carbon atoms; R A2 represents a straight-chain alkyl group having 1 to 8 carbon atoms.

6. The liquid crystal composition according to claim 1, characterized in that, The type II compound is selected from the group consisting of at least one of the following compounds: and 7. The liquid crystal composition according to claim 6, wherein The type II compound is selected from the group consisting of at least one of the following compounds: and wherein, R B11 , R B21 , R B12 and R B22 Each independently represents a straight chain or branched chain alkyl group containing 1 to 8 carbon atoms, a straight chain or branched chain alkoxy group containing 1 to 8 carbon atoms, R B110 、R B210 、R B120 and R B220 each independently represents a straight-chain or branched alkenyl group having 2 to 8 carbon atoms.

8. The liquid crystal composition according to claim 1, characterized in that The compound of general formula III is selected from the group consisting of at least one of the following compounds: and 9. The liquid crystal composition according to claim 3, characterized in that, The type M compound is selected from the group consisting of at least one of the following compounds: and Among them, R M11 , R M21 , R M31 and R M41 each independently represents a straight-chain alkyl group having 1 to 8 carbon atoms, a branched-chain alkyl group having 3 to 8 carbon atoms, a straight-chain alkoxy group having 1 to 8 carbon atoms, or a branched-chain alkoxy group having 3 to 8 carbon atoms; R M1 、R M2 、R M3 、R M4 、R M5 and R M6 each independently represents a straight-chain alkyl group having 1 to 8 carbon atoms, a branched-chain alkyl group having 3 to 8 carbon atoms, a straight-chain alkoxy group having 1 to 8 carbon atoms, a branched-chain alkoxy group having 3 to 8 carbon atoms, a straight-chain alkenyl group having 2 to 8 carbon atoms or a branched-chain alkenyl group having 3 to 8 carbon atoms.

10. A liquid crystal display device, characterized in that, The liquid crystal display device comprises the liquid crystal composition according to any one of claims 1 to 9.

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