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

Abstract

The invention provides a positive 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 II selected from the group consisting of a compound of general formula II-A and / or a compound of general formula II-B; the compound III is selected from a group consisting of a compound as shown in a general formula III-1 and / or a compound as shown in a general formula III-2. The liquid crystal composition provided by the invention has proper dielectric anisotropy, proper clearing point, better optical anisotropy, lower rotary viscosity, higher response speed, larger elastic constant, better contrast ratio, better low-temperature storage property and wider nematic phase temperature range, and is suitable for fast-response display modes such as VA, PSVA, IPS and NFFS. # imgabs0 #

Description

Technical Field

[0001] The present invention belongs to the technical field of liquid crystal materials, and particularly relates to a positive 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 have been widely applied at present. 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] In the early 1970s, experimental studies were conducted on the basic electro-optical properties of nematic liquid crystal IPS modes with homogeneous alignment and twisted alignment. Its characteristic is that a pair of electrodes are fabricated on the same substrate, while there are no electrodes on the other substrate, and the alignment of liquid crystal molecules is controlled by the transverse electric field applied between this pair of electrodes. Therefore, this mode can also be called the transverse field mode. In the IPS mode, nematic liquid crystal molecules are uniformly and parallelly aligned between the two substrates, and two polarizers are placed orthogonally. When no electric field is applied in the IPS mode, incident light is blocked by the two orthogonal polarizers and appears in a dark state. When an electric field is applied, the liquid crystal molecules rotate to cause a delay, and thus light leaks out from the two orthogonal polarizers. The advantages of a panel adopting the IPS mode are a large viewing angle and accurate color reproduction, but the disadvantages are relatively serious light leakage and a slow response speed.

[0004] 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. In addition, higher contrast and transmittance are also needed, especially for the IPS type liquid crystal display mode. This means that liquid crystal materials need to have higher contrast and transmittance, higher elastic constants, higher dielectric constants, and low-temperature reliability. The improvement of these performances requires the improvement of liquid crystal materials.

[0005] The relationship between contrast ratio (CR) and luminance (L) is as follows:

[0006] CR = L 255 / L0 × 100%, where L 255 is the on-state luminance and L0 is the off-state luminance.

[0007] It can be seen that the change of L0 should significantly affect CR; in the off-state, L0 has nothing to do with the dielectric of 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.

[0008] In addition, the most important factor affecting the contrast ratio of liquid crystal display elements is the light leakage of liquid crystal materials, and the main factor affecting light leakage is light scattering (LC Scattering). The relationship between LC Scattering and the average elastic constant K ave is as follows:

[0009] LC Scattering ∝ dΔn 2 (n e + n o ) 2 / K ave , where d represents the cell gap 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 . In the case of increasing K ave , the light leakage of liquid crystal materials can be reduced.

[0010] Response speed is an important parameter for 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 cell gap of the liquid crystal cell in the liquid crystal display device, and K 22is the elastic constant related to liquid crystal; a liquid crystal composition with a small rotational viscosity can improve the response speed of a liquid crystal display element, and a liquid crystal composition with a small rotational viscosity at low temperature can improve the response speed of a liquid crystal display element at low temperature.

[0011] When the delay amount Δnd is constant, having a high optical refractive anisotropy Δn, the display device can be made thinner, thereby improving the response speed. When the response speed of the liquid crystal display element is fast, it can be applied to animated displays.

[0012] The elastic constant K value of the liquid crystal composition can affect the change in the driving voltage of the liquid crystal display element. The K value changes with temperature, and different liquid crystal compositions have different K value change rates.

[0013] Therefore, developing a liquid crystal composition with appropriate dielectric anisotropy, appropriate clearing point, good optical anisotropy, low rotational viscosity, fast response speed, high elastic constant, high contrast and transmittance, good low-temperature storage property and wide nematic phase temperature range is an urgent problem to be solved in this field. Summary of the Invention

[0014] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a positive dielectric liquid crystal composition and a liquid crystal display device containing the same. The liquid crystal composition of the present invention has appropriate dielectric anisotropy, appropriate clearing point, good optical anisotropy, low rotational viscosity, fast response speed, large elastic constant, good contrast, good low-temperature storage property and wide nematic phase temperature range, and is applicable to fast-response display modes such as VA, PSVA, IPS, and NFFS.

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

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

[0017] At least one compound of general formula I:

[0018]

[0019] At least one 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 type III compound, and the type III compound is selected from the group consisting of compounds of general formula III-1 and / or compounds of general formula III-2:

[0022]

[0023] Among them,

[0024] R N1 represents a straight-chain or branched alkoxy group having 1 to 12 (for example, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, or a straight-chain or branched alkenyl group having 2 to 12 (for example, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms;

[0025] R B11 , R B21 , R B12 and R B22 each independently represents a straight-chain or branched alkyl group having 1 to 12 (for example, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, a straight-chain or branched alkenyl group having 2 to 12 (for example, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, one or more non-adjacent -CH2- in the straight-chain or branched alkyl group having 1 to 12 carbon atoms can be independently replaced by -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-, and at least one of R B11 and R B21 represents a straight-chain or branched alkenyl group having 2 to 12 carbon atoms, and at least one of R B12 and R B22 represents a straight-chain or branched alkenyl group having 2 to 12 carbon atoms;

[0026] R N2 represents a straight-chain or branched alkyl group having 1 to 12 (for example, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms,

[0027]

[0028] R A1 and R A2 each independently represents -H, a straight-chain or branched alkyl group having 1 to 12 (for example, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, one or more non-adjacent -CH2- in the straight-chain or branched alkyl group having 1 to 12 carbon atoms can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-, and one or more -H in the foregoing groups can be independently replaced by -F or -Cl;

[0029] Ring and Ring Each independently represents and ring and ring at least one of which represents

[0030] ring ring or ring Each independently represents the One or more -CH2- in the above may be replaced by -O-, one or at most two single bonds in the rings may be replaced by double bonds, and at least one ring or ring represents

[0031] ring ring ring and ring Each independently represents the One or more -CH2- in the above may be replaced by -O-, the One or at most two single bonds in the rings may be replaced by double bonds, the One or more -CH= in one or more rings may be replaced by -N=, and one or more -H in the foregoing groups may be independently replaced by -F, -Cl or -CN respectively;

[0032] Z A11 and Z A21 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-;

[0033] Z A22 represents a single bond, -CH2CH2-, -(CH2)4-, -CF2CF2-, -CO-O-, -O-CO-, -O-CO-O-, -CH=CH-, -CF=CF-, -CH2O- or -OCH2-;

[0034] L0 represents -H or a halogen;

[0035] L A11 、L A12 、L A13 、L A21 or L A22Each independently represents -H, a straight-chain alkyl group having 1 to 3 (e.g., 1, 2, or 3) carbon atoms that is unsubstituted or halogenated with halogen;

[0036] X A1 and X A2 Each independently represents a halogen, a haloalkyl group having 1 to 5 (e.g., 1, 2, 3, 4, or 5) carbon atoms, a haloalkoxy group having 1 to 5 (e.g., 1, 2, 3, 4, or 5) carbon atoms, a haloalkenyl group having 2 to 5 (e.g., 2, 3, 4, or 5) carbon atoms, or a haloalkenyloxy group having 2 to 5 (e.g., 2, 3, 4, or 5) carbon atoms;

[0037] n B1 and n B2 Each independently represents 0 or 1;

[0038] n A11 represents 0, 1, 2, or 3; when n A11 = 2 or 3, the rings may be the same or different, and Z A11 may be the same or different;

[0039] n A12 is 1 or 2; when n A12 = 2, the rings may be the same or different;

[0040] n A2 represents 0, 1, 2, or 3; when n A2 = 2 or 3, the rings may be the same or different, and Z A21 may be the same or different.

[0041] The alkenyl group in the present invention is preferably a group represented by any one of formulas (V1) to (V9), and particularly preferably formulas (V1), (V2), (V8), or (V9). The groups represented by formulas (V1) to (V9) are as follows:

[0042] Among them, "X" represents a carbon atom in the ring structure to which it is bonded.

[0043] The alkenyloxy group in the present invention is preferably a group represented by any one of formulas (OV1) to (OV9), and particularly preferably formulas (OV1), (OV2), (OV8), or (OV9). The groups represented by formulas (OV1) to (OV9) are as follows:

[0044] "X" represents a carbon atom in the ring structure to which it is bonded.

[0045] When n A11 = 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 refers to the expression "the same or different", it has the same meaning

[0046] 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 is within 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

[0047] In the present invention, the short straight lines on one or both sides of the group structure represent the access keys and do not represent methyl groups. For example The short straight lines on both sides

[0048] In the present invention, the halogen includes fluorine, chlorine, bromine, iodine, etc.; when the same description is involved below, it has the same meaning

[0049] In some embodiments of the present invention, the R N1 represents a straight-chain alkoxy group containing 1-8 (for example, 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched-chain alkoxy group containing 3-8 (for example, 3, 4, 5, 6, 7, or 8) carbon atoms, a straight-chain alkenyl group containing 2-8 (for example, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, or a branched-chain alkenyl group containing 3-8 (for example, 3, 4, 5, 6, 7, or 8) carbon atoms; further preferably, a straight-chain alkoxy group containing 1-8 carbon atoms and a straight-chain alkenyl group containing 2-8 carbon atoms

[0050] In some embodiments of the present invention, the R N2 represents a straight-chain alkyl group containing 1-8 (for example, 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms or a branched-chain alkyl group containing 3-8 (for example, 3, 4, 5, 6, 7, or 8) carbon atoms

[0051] In some embodiments of the present invention, the compound of general formula I is selected from the group consisting of at least one (for example, two or three) of the following compounds

[0052]

[0053] and

[0054]

[0055] In some embodiments of the present invention, the compound of general formula I is selected from the group consisting of at least one (e.g., two, three) of the following compounds:

[0056]

[0057]

[0058] wherein, R N11 represents a straight-chain alkoxy group having 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms;

[0059] R N12 represents a straight-chain alkenyl group having 2-8 (e.g., 2, 3, 4, 5, 6, 7, or 8) carbon atoms;

[0060] R N2 represents a straight-chain alkyl group having 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms.

[0061] In some embodiments of the present invention, the R N11 represents a straight-chain alkoxy group having 1-5 carbon atoms.

[0062] In some embodiments of the present invention, the R N12 represents a straight-chain alkenyl group having 2-5 carbon atoms.

[0063] In some embodiments of the present invention, the R N2 represents a straight-chain alkyl group having 1-5 carbon atoms.

[0064] In some embodiments of the present invention, in order to maintain appropriate dielectric anisotropy, appropriate clearing point, good optical anisotropy, while having a lower rotational viscosity, faster response speed, larger elastic constant, better contrast, better low-temperature storage property, and a wider nematic phase temperature range, the compound of general formula I comprises at least one (e.g., two, three, four, or five, etc.) compound selected from the group consisting of the compound of general formula I-1 and the compound of general formula I-2.

[0065] In some embodiments of the present invention, in order to have a lower rotational viscosity, a faster response speed, a larger elastic constant, a better contrast ratio, better low-temperature storage properties, and a wider nematic phase temperature range while maintaining appropriate dielectric anisotropy, an appropriate clearing point, and good optical anisotropy, the compound of general formula I comprises at least one (e.g., two, three, four, five, etc.) 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.

[0066] In some embodiments of the present invention, it is preferred to adjust the content of the compound of general formula I such that the liquid crystal composition containing the same has a lower rotational viscosity, a faster response speed, a larger elastic constant, a better contrast ratio, better low-temperature storage properties, and a wider nematic phase temperature range.

[0067] 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 0.1 - 30%.

[0068] In some embodiments of the present invention, the mass percentage content of at least one (e.g., two, three, four, five, etc.) 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.

[0069] In some embodiments of the present invention, the mass percentage content of at least one (e.g., two, three, four, five, etc.) 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 0.1% - 30% (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%, or the range between any two of these values.

[0070] In some embodiments of the present invention, said R B11 , R B21 , R B12 and R B22 each independently represents a straight-chain alkyl group containing 1 - 8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched-chain alkyl group containing 3 - 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms, a straight-chain or branched-chain alkenyl group containing 2 - 8 (e.g., 2, 3, 4, 5, 6, 7, or 8) carbon atoms, and at least one of R B11 and R B21 represents a straight-chain or branched-chain alkenyl group containing 2 - 8 carbon atoms; at least one of R B12 and R B22 represents a straight-chain or branched-chain alkenyl group containing 2 - 8 carbon atoms.

[0071] In some embodiments of the present invention, the type II compounds are selected from the group consisting of at least one (e.g., two, three, or four) of the following compounds:

[0072]

[0073] and

[0074]

[0075] In some embodiments of the present invention, the type II compounds are selected from the group consisting of at least one (e.g., two, three, or four) of the following compounds:

[0076]

[0077]

[0078] and

[0079]

[0080] Among them,

[0081] R B11 、R B21 、R B12 and R B22 each independently represents a straight-chain or branched-chain alkyl group having 1 to 10 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10) carbon atoms, a straight-chain or branched-chain alkoxy group having 1 to 10 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10) carbon atoms,

[0082] R B110 、R B210 、R B120 and R B220 each independently represents a straight-chain or branched-chain alkenyl group having 2 to 10 (e.g., 2, 3, 4, 5, 6, 7, 8, 9, or 10) carbon atoms.

[0083] In some embodiments of the present invention, in order to have a lower rotational viscosity, a faster response speed, a larger elastic constant, a better contrast ratio, a better low-temperature storage property, and a wider nematic phase temperature range on the basis of maintaining appropriate dielectric anisotropy, an appropriate clearing point, and better optical anisotropy, the class II compound comprises at least one (e.g., two, three, four, or five, etc.) selected from the group consisting of the compound of general formula II-A-1, the compound of general formula II-A-2, the compound of general formula II-A-3, and the compound of general formula II-B-1.

[0084] In some embodiments of the present invention, in order to have a lower rotational viscosity, a faster response speed, a larger elastic constant, a better contrast ratio, a better low-temperature storage property, and a wider nematic phase temperature range on the basis of maintaining appropriate dielectric anisotropy, an appropriate clearing point, and better optical anisotropy, the class II compound comprises at least one (e.g., two, three, four, or five, etc.) selected from the group consisting of the compound of general formula II-A-1-1, the compound of general formula II-A-2-2, the compound of general formula II-A-3-1, the compound of general formula II-A-3-2, and the compound of general formula II-B-1-2.

[0085] In some embodiments of the present invention, it is preferred to adjust the content of the class II compound such that the liquid crystal composition containing it has a lower rotational viscosity, a faster response speed, a larger elastic constant, a better contrast ratio, a better low-temperature storage property, and a wider nematic phase temperature range.

[0086] In some embodiments of the present invention, the mass percentage content of the compound of Class II in the liquid crystal composition is 0.1% - 40% (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%, or the range between any two of these values. Preferably, the mass percentage content of the compound of Class II is 1% - 35%.

[0087] In some embodiments of the present invention, the mass percentage content of at least one (e.g., two, three, four, five, etc.) compound selected from the group consisting of the compound of general formula II-A-1, the compound of general formula II-A-2, the compound of general formula II-A-3, and the compound 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.

[0088] In some embodiments of the present invention, the mass percentage content of at least one (e.g., two, three, four, five, etc.) compound selected from the group consisting of the compound of general formula II-A-1-1, the compound of general formula II-A-2-2, the compound of general formula II-A-3-1, the compound of general formula II-A-3-2, and the compound of general formula II-B-1-2 is 1% - 30% (including any value or sub-range within this range), for example, 0.3%, 0.5%, 0.7%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, or the range between any two of these values.

[0089] In some embodiments of the present invention, the compound of Formula III-1 is selected from the group consisting of at least one (e.g., two, three, four, five, six, seven) of the following compounds:

[0090]

[0091]

[0092] and

[0093]

[0094] wherein R A1 has the same defined range as in Formula III-1;

[0095] R v and R w each independently represents -CH2- or -O-;

[0096] L A11 , L A12 , L A14 , L A15 and L A16 each independently represents -H or -F;

[0097] L A13 represents -H or -CH3;

[0098] X A1 represents -F, -CF3 or -OCF3; and

[0099] v and w each independently represent 0 or 1.

[0100] In some embodiments of the present invention, the compound of Formula III-1 comprises at least one (e.g., two, three, four, five, six or seven) selected from the group consisting of the compound of Formula III-1-5, the compound of Formula III-1-12, and the compound of Formula III-1-14.

[0101] In some embodiments of the present invention, the compound of Formula III-1 comprises at least one (e.g., two, three, four, five, six or seven) of the following compounds:

[0102]

[0103] and

[0104]

[0105] In some embodiments of the present invention, the compound of Formula III-2 is selected from the group consisting of at least one (e.g., two, three, four, five, six, or seven) of the following compounds:

[0106]

[0107]

[0108]

[0109] and

[0110]

[0111] wherein R A2 has the same defined range as in Formula III-2;

[0112] L A21 、L A22 、L A23 、L A24 and L A25 each independently represents -H or -F;

[0113] X A2 represents -F, -CF3, or -OCF3.

[0114] In some embodiments of the present invention, the compound of Formula III-2 comprises at least one (e.g., two, three, four, five, six, or seven) selected from the group consisting of the compound of Formula III-2-5, the compound of Formula III-2-10, the compound of Formula III-2-14, the compound of Formula III-2-15, and the compound of Formula III-2-19.

[0115] In some embodiments of the present invention, the compound of Formula III-2 is selected from the group consisting of at least one (e.g., two, three, four, five, six, or seven) of the following compounds:

[0116]

[0117]

[0118] and

[0119]

[0120] In some embodiments of the present invention, in order to have a lower rotational viscosity, a faster response speed, a larger elastic constant, a better contrast ratio, a better low-temperature storage property, and a wider nematic phase temperature range while maintaining appropriate dielectric anisotropy, an appropriate clearing point, and good optical anisotropy, the class III compound comprises at least one (e.g., two, three, four, or five, etc.) compound selected from the group consisting of the compounds of general formula III-1 and the compounds of general formula III-2.

[0121] In some embodiments of the present invention, in order to have a lower rotational viscosity, a faster response speed, a larger elastic constant, a better contrast ratio, a better low-temperature storage property, and a wider nematic phase temperature range while maintaining appropriate dielectric anisotropy, an appropriate clearing point, and good optical anisotropy, the class III compound comprises at least one (e.g., two, three, four, or five, etc.) compound selected from the group consisting of the compounds of general formula III-1-5, the compounds of general formula III-1-12, the compounds of general formula III-1-14, the compounds of general formula III-2-5, the compounds of general formula III-2-10, the compounds of general formula III-2-14, the compounds of general formula III-2-15, and the compounds of general formula III-2-19.

[0122] In some embodiments of the present invention, in order to have a lower rotational viscosity, a faster response speed, a larger elastic constant, a better contrast ratio, a better low-temperature storage property, and a wider nematic phase temperature range while maintaining appropriate dielectric anisotropy, an appropriate clearing point, and good optical anisotropy, the class III compound comprises at least one (e.g., two, three, four, or five, etc.) compound selected from the group consisting of the compounds of general formula III-1-5A, the compounds of general formula III-1-12A, the compounds of general formula III-1-14B, the compounds of general formula III-2-5A, the compounds of general formula III-2-5B, the compounds of general formula III-2-10A, the compounds of general formula III-2-10B, the compounds of general formula III-2-14A, the compounds of general formula III-2-15A, the compounds of general formula III-2-15B, the compounds of general formula III-2-19A, and the compounds of general formula III-2-19B.

[0123] In some embodiments of the present invention, it is preferred to adjust the content of the class III compound such that the liquid crystal composition containing it has a lower rotational viscosity, a faster response speed, a larger elastic constant, a better contrast ratio, a better low-temperature storage property, and a wider nematic phase temperature range.

[0124] In some embodiments of the present invention, the mass percentage content of the compound of Class III in the liquid crystal composition is 0.1% - 60% (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%, or the range between any two of these values. Preferably, the mass percentage content of the compound of Class III is 1% - 55%.

[0125] In some embodiments of the present invention, the mass percentage content of at least one (e.g., two, three, four, five, etc.) compound selected from the group consisting of the compound of general formula III-1 and the compound of general formula III-2 is 0.1% - 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.

[0126] In some embodiments of the present invention, the mass percentage content of at least one (e.g., two, three, four, five, etc.) compound selected from the group consisting of compounds of general formula III-1-5, compounds of general formula III-1-12, compounds of general formula III-1-14, compounds of general formula III-2-5, compounds of general formula III-2-10, compounds of general formula III-2-14, compounds of general formula III-2-15, and compounds of general formula III-2-19 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.

[0127] In some embodiments of the present invention, the mass percentage content of at least one (e.g., two, three, four, five, etc.) compound selected from the group consisting of compounds of general formula III-1-5A, compounds of general formula III-1-12A, compounds of general formula III-1-14B, compounds of general formula III-2-5A, compounds of general formula III-2-5B, compounds of general formula III-2-10A, compounds of general formula III-2-10B, compounds of general formula III-2-14A, compounds of general formula III-2-15A, compounds of general formula III-2-15B, compounds of formula III-2-19A, and compounds of general formula III-2-19B is 2% - 55% (including any value or sub-range within this range), for example, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 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.

[0128] In some embodiments of the present invention, the liquid crystal composition further comprises at least one (e.g., two, three, four, five, etc.) type M compound, and the type M compound is selected from the group consisting of at least one of the compounds of general formula M1, the compounds of general formula M2, and the compounds of general formula M3:

[0129]

[0130] Wherein, R M1 、R M2 、R M3 、R M4 、R M5 and R M6 each independently represents a straight-chain or branched-chain alkyl group containing 1-12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, one or more non-adjacent -CH2- in the straight-chain or branched-chain alkyl group containing 1-12 carbon atoms can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO- respectively;

[0131] 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-, -CH2O-, or -OCH2-;

[0132] Ring and ring each independently represents The one or more -CH2- in it can be replaced by -O-. When ring and ring are both , R M1 or R M2 is not an alkenyl group;

[0133] Ring and ring each independently represents The one or more -CH2- in it can be replaced by -O-, and at most one -H in the can be replaced by a halogen;

[0134] Ring represents The One or more of the -CH2- in it may be replaced by -O-, and one or at most two single bonds in the rings may be replaced by double bonds. The At most one -H in it may be replaced by a halogen;

[0135] Ring and ring Each independently represents The One or more of the -CH2- in it may be replaced by -O-, and one or at most two single bonds in the rings may be replaced by double bonds;

[0136] n M Represents 1, 2 or 3; when n M = 2 or 3, the rings Are the same or different, and Z M5 Are the same or different.

[0137] In some embodiments of the present invention, the R M1 , R M2 , R M3 , R M4 , R M5 and R M6 Each independently is selected from straight-chain alkyl groups having 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms, branched-chain alkyl groups having 3-8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms, straight-chain alkenyl groups having 2-8 (e.g., 2, 3, 4, 5, 6, 7 or 8) carbon atoms, branched-chain alkenyl groups having 3-8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms, straight-chain alkoxy groups having 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms, branched-chain alkoxy groups having 3-8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms,

[0138] 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-.

[0139] In some embodiments of the present invention, the n M Represents 1 or 2.

[0140] 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, six or seven) of the following compounds:

[0141]

[0142]

[0143]

[0144]

[0145] and

[0146]

[0147] wherein, R M11 , R M21 , R M31 and R M41 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, or a branched-chain alkoxy group having 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms;

[0148] R M1 , R M2 , R M3 , R M4 , R M5 and R M6 each independently represents a straight-chain alkyl group having 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched-chain alkyl group having 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms, a straight-chain alkoxy group having 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched-chain alkoxy group having 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms, a straight-chain alkenyl group having 2-8 (e.g., 2, 3, 4, 5, 6, 7, or 8) carbon atoms, or a branched-chain alkenyl group having 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms.

[0149] In some embodiments of the present invention, the M-type compound is selected from the group consisting of at least one of the following compounds:

[0150]

[0151] and

[0152]

[0153] wherein, R M1 、R M2 、R M11 and R M21 each independently represents a straight-chain alkyl group having 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms; R M20 represents a straight-chain alkenyl group having 2-8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms; and R M200 represents a straight-chain alkoxy group having 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms.

[0154] In some embodiments of the present invention, in order to have a lower rotational viscosity, a faster response speed, a larger elastic constant, a better contrast ratio, a better low-temperature storage property, and a wider nematic phase temperature range while maintaining appropriate dielectric anisotropy, an appropriate clearing point, and better optical anisotropy, the M-type compound comprises at least one (e.g., two, three, four, or five, etc.) compound selected from the group consisting of the compounds of general formula M1-1, the compounds of general formula M1-5, and the compounds of general formula M1-10.

[0155] In some embodiments of the present invention, in order to have a lower rotational viscosity, a faster response speed, a larger elastic constant, a better contrast ratio, a better low-temperature storage property, and a wider nematic phase temperature range while maintaining appropriate dielectric anisotropy, an appropriate clearing point, and better optical anisotropy, the M-type compound comprises at least one (e.g., two, three, four, or five, etc.) compound selected from the group consisting of the compounds of general formula M1-1-1, the compounds of general formula M1-1-2, the compounds of general formula M1-5-2, and the compounds of general formula M1-10.

[0156] In some embodiments of the present invention, it is preferred to adjust the content of the M-type compound such that the liquid crystal composition containing it has a lower rotational viscosity, a faster response speed, a larger elastic constant, a better contrast ratio, a better low-temperature storage property, and a wider nematic phase temperature range.

[0157] In some embodiments of the present invention, the mass percentage content of the compound of type M 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 compound of type M is 1% - 60%.

[0158] In some embodiments of the present invention, the mass percentage content of at least one (for example, two, three, four, five, etc.) compound selected from the group consisting of the compound of general formula M1-1, the compound of general formula M1-5, and the compound 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.

[0159] In some embodiments of the present invention, the mass percentage content of at least one (e.g., two, three, four, five, etc.) 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% - 50% (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%, or the range between any two of these values.

[0160] 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.

[0161] In a preferred technical solution, the liquid crystal composition further includes at least one additive.

[0162] 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.

[0163] The possible dopants preferably added to the liquid crystal composition of the present invention are shown as follows:

[0164]

[0165]

[0166] And

[0167]

[0168] Among them, "*" represents a chiral site.

[0169] 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%.

[0170] In addition, additives such as antioxidants and light stabilizers used in the liquid crystal composition of the present invention are preferably the following substances:

[0171]

[0172]

[0173]

[0174]

[0175] Among them, n represents a positive integer from 1 to 12; n2 represents a positive integer from 1 to 18; " + " represents a free radical.

[0176] Preferably, the light stabilizer is selected from the light stabilizers shown below:

[0177]

[0178] In some embodiments of the present invention, the total mass percentage 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%, or the range between any two of these values; preferably 0.01 - 1%.

[0179] 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.

[0180] In a preferred technical solution, the liquid crystal display device is any one of VA display mode, PSVA display mode, IPS display mode, and NFFS display mode.

[0181] The numerical ranges described in the present invention not only include the above-listed point values, but also include 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 ranges.

[0182] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0183] The liquid crystal composition provided by the present invention has appropriate dielectric anisotropy, appropriate clearing point, good optical anisotropy, low rotational viscosity, fast response speed, large elastic constant, good contrast, good low-temperature storage property, and a wider nematic phase temperature range, and is applicable to fast-response display modes such as VA, PSVA, IPS, and NFFS. Detailed Embodiments

[0184] The technical solution of the present invention will be further described below through specific embodiments. Those skilled in the art should understand that the embodiments are only for helping to understand the present invention and should not be regarded as specific limitations on the present invention.

[0185] For the 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:

[0186] Table 1

[0187]

[0188] Taking the compound with the following structural formula as an example:

[0189]

[0190] 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 the alkyl group is -C3H7; C in the code represents 1,4-cyclohexylene, G represents 2-fluoro-1,4-phenylene, and F represents fluorine.

[0191] The abbreviated codes for the test items in the embodiments of the present invention are as follows:

[0192] Cp Clearing point (transition temperature from nematic phase to isotropic phase, °C)

[0193] Δn Optical anisotropy (589 nm, 25 °C)

[0194] n o Refractive index of ordinary light

[0195] n e Refractive index of extraordinary light

[0196] Δε Dielectric anisotropy (1 kHz, 25 °C)

[0197] K ave Average elastic constant (20 °C)

[0198] K 11 Splay elastic constant (25 °C)

[0199] K 22 Twist elastic constant (25 °C)

[0200] K 33 Bend elastic constant (25 °C)

[0201] γ1(25 °C) Rotational viscosity (mPa·s, 25 °C)

[0202] τd(25 °C) Decay time (ms, 25 °C)

[0203] γ1 (-10°C) Rotational viscosity (mPa·s, -10°C)

[0204] τd (-10°C) Decay time (ms, -10°C)

[0205] CR Contrast ratio (25°C)

[0206] LTS (-40°C) Low-temperature storage time (-40°C, h)

[0207] Among them,

[0208] Cp: Obtained by testing with a melting point instrument.

[0209] Δn: Δn = n e -n o , and obtained by testing with an Abbe refractometer under the light source of a sodium lamp (589 nm) at 25°C.

[0210] 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: TN90 type test cell at 25°C, 1 KHz, and cell thickness of 7 μm.

[0211] K ave : (K 11 + K 22 + K 33 ), 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 with an LCR meter and an antiparallel rubbing cell and performing calculations; test conditions: 7 μm antiparallel rubbing cell, V = 0.1 - 20 V, Kave = 1 / 3(K 11 + K 22 + K 33 )

[0212] γ1 at 25°C: Obtained by testing with a TOYO6254 type liquid crystal physical property evaluation system; test conditions: 25°C, 90 V, and cell thickness of 20 μm.

[0213] τd at 25°C: τd(25°C) = γ1(25°C) * d 2 / K 22 * π 2 .

[0214] γ1 at -10°C: Obtained by testing with a TOYO6254 type liquid crystal physical property evaluation system; Test conditions: -10°C, 90V, test cell thickness 20μm.

[0215] τd at -10°C: τd(-10°C) = γ1(-10°C) * d 2 / K 22 *π 2 。

[0216] CR: The transmittance of the liquid crystal cell is measured using a DMS 505 tester at 255 gray-scale voltage and 0 gray-scale voltage, namely T r255 and T r0 , obtained from T r255 / T r0 ; Test conditions: Positive FFS type test cell at 25°C, cell thickness 3μm.

[0217] LTS(-40°C): The nematic liquid crystal medium is placed in a glass bottle, stored at a constant temperature of -40°C, and the time is recorded when crystals are observed to precipitate.

[0218] Comparative Example 1

[0219] The liquid crystal composition DB-1 of Comparative Example 1 is prepared according to the compounds listed in Table 2 and their mass percentage contents in the liquid crystal composition, and it is filled between the two substrates of the liquid crystal display for performance testing.

[0220] Table 2 Formulation of liquid crystal composition DB-1 and test results of performance parameters

[0221]

[0222]

[0223] Comparative Example 2

[0224] The liquid crystal composition DB-2 of Comparative Example 2 is prepared according to the compounds listed in Table 3 and their mass percentage contents in the liquid crystal composition, and it is filled between the two substrates of the liquid crystal display for performance testing.

[0225] Table 3 Formulation of liquid crystal composition DB-2 and test results of performance parameters

[0226]

[0227] Example 1

[0228] The liquid crystal composition B-1 of Example 1 is prepared according to the compounds listed in Table 4 and their mass percentage contents in the liquid crystal composition, and it is filled between the two substrates of the liquid crystal display for performance testing.

[0229] Formulation of Liquid Crystal Composition B-1 and Test Results of Performance Parameters

[0230]

[0231] Example 2

[0232] 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 two substrates of a liquid crystal display for performance testing.

[0233] Formulation of Liquid Crystal Composition B-2 and Test Results of Performance Parameters

[0234]

[0235]

[0236] Example 3

[0237] The liquid crystal composition B-3 of Example 3 was prepared according to the compounds listed in Table 6 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.

[0238] Formulation of Liquid Crystal Composition B-3 and Test Results of Performance Parameters

[0239]

[0240] Example 4

[0241] The liquid crystal composition B-4 of Example 4 was prepared according to the compounds listed in Table 7 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.

[0242] Formulation of Liquid Crystal Composition B-4 and Test Results of Performance Parameters

[0243]

[0244]

[0245] Example 5

[0246] The liquid crystal composition B-5 of Example 5 was prepared according to the compounds listed in Table 8 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.

[0247] Formulation of Liquid Crystal Composition B-5 and Test Results of Performance Parameters

[0248]

[0249] Example 6

[0250] 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.

[0251] Table 9 Formulation of Liquid Crystal Composition B-6 and Test Results of Performance Parameters

[0252]

[0253] Example 7

[0254] 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.

[0255] Table 10 Formulation of Liquid Crystal Composition B-7 and Test Results of Performance Parameters

[0256]

[0257] Example 8

[0258] The liquid crystal composition B-8 of Example 8 was prepared according to the compounds listed in Table 11 and their mass percentages in the liquid crystal composition, and it was filled between two substrates of a liquid crystal display for performance testing.

[0259] Table 11 Formulation of Liquid Crystal Composition B-8 and Test Results of Performance Parameters

[0260]

[0261] Example 9

[0262] The liquid crystal composition B-9 of Example 9 was prepared according to the compounds listed in Table 12 and their mass percentages in the liquid crystal composition, and it was filled between two substrates of a liquid crystal display for performance testing.

[0263] Table 12 Formulation of Liquid Crystal Composition B-9 and Test Results of Performance Parameters

[0264]

[0265]

[0266] Example 10

[0267] The liquid crystal composition B-10 of Example 10 was prepared according to the compounds listed in Table 13 and their mass percentages in the liquid crystal composition, and it was filled between two substrates of a liquid crystal display for performance testing.

[0268] Formulation of Liquid Crystal Composition B-10 and Test Results of Performance Parameters

[0269]

[0270] From Comparative Examples 1 and 2 and Examples 1-10, it can be seen that for the liquid crystal composition provided by the present invention, through the compounding of specific structures and contents of the compounds, the liquid crystal composition has a lower rotational viscosity (γ1(25 °C): 71-88; γ1(-10 °C): 120-153), a faster response speed (τd(25 °C): 10.2-14; τd(-10 °C): 45-67), a larger elastic constant (K ave : 12-13.9), a better contrast ratio (CR: 1600-2100), a better low-temperature storage property (≥15 days at -40 °C), and a wider nematic phase temperature range while maintaining an appropriate dielectric anisotropy (Δε: 3.3-5.3), an appropriate clearing point (Cp: 70-86), and a good optical anisotropy (Δn: 0.098-0.112).

[0271] The above specific embodiments 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 positive 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 a compound of general formula II-A and / or a compound of general formula II-B: at least one type III compound selected from the group consisting of a compound of general formula III-1 and / or a compound of general formula III-2: wherein, R N1 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 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- groups 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 N2 represents an alkyl group with a straight or branched chain having 1 to 12 carbon atoms, R A1 and R A2 each independently represents -H, a linear or branched alkyl group having 1 to 12 carbon atoms, one or more non-adjacent -CH2- in the linear 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-, and one or more -H in the foregoing groups may be independently replaced by -F or -Cl; Ring and the ring each independently represents and the ring and the ring at least one of which represents ring ring or ring each independently represents the one or more of the -CH2- in may be replaced by -O-, the single bond in one or at most two rings may be replaced by a double bond, and at least one ring or ring represents Ring Ring Ring and Ring each independently represents the one or more -CH2- in the above can be replaced by -O-, the single bond in one or at most two rings in the above can be replaced by a double bond, the -CH= in one or more rings in the above can be replaced by -N=, and one or more -H in the foregoing groups can be independently replaced by -F, -Cl or -CN respectively; Z A11 and Z A21 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-; Z A22 represents a single bond, -CH2CH2-, -(CH2)4-, -CF2CF2-, -CO-O-, -O-CO-, -O-CO-O-, -CH=CH-, -CF=CF-, -CH2O- or -OCH2-; L0 represents -H or a halogen; L A11 、L A12 、L A13 、L A21 and L A22 each independently represents -H, a halogen, or an unsubstituted or halogenated straight-chain alkyl group having 1 to 3 carbon atoms; X A1 and X A2 each independently represents a halogen, a haloalkyl having 1 to 5 carbon atoms, a haloalkoxy having 1 to 5 carbon atoms, a haloalkenyl having 2 to 5 carbon atoms or a haloalkenyloxy having 2 to 5 carbon atoms; n B1 and n B2 each independently represents 0 or 1; n A11 represents 0, 1, 2 or 3; when n A11 = 2 or 3, the rings may be the same or different, and Z A11 may be the same or different; n A12 is 1 or 2; when n A12 = 2, the rings may be the same or different; n A2 represents 0, 1, 2 or 3; when n A2 = 2 or 3, the rings can be the same or different, and Z A21 can be the same or different.

2. The liquid crystal composition according to claim 1, characterized in that, the compound of general formula I is selected from the group consisting of at least one of the following compounds: and 3. 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 4. The liquid crystal composition according to claim 1, characterized in that, the compound of general formula III-1 is selected from the group consisting of at least one of the following compounds: and wherein, R A1 has the same defined scope as in General Formula III-1; R v and R w each independently represents -CH2- or -O-; L A11 、L A12 、L A14 、L A15 and L A16 each independently represents -H or -F; L A13 represents -H or -CH3; X A1 represents -F, -CF3 or -OCF3; and v and w each independently represent 0 or 1.

5. The liquid crystal composition according to claim 1, characterized in that, the compound of general formula III-2 is selected from the group consisting of at least one of the following compounds: and wherein, R A2 has the same defined scope as in General Formula III-2; L A21 、L A22 、L A23 、L A24 and L A25 each independently represents -H or -F; X A2 represents -F, -CF3 or -OCF3.

6. 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 a compound of general formula M1, a compound of general formula M2, and a compound of general formula M3: Among them, R M1 , R M2 , R M3 , R M4 , R M5 and R M6 each independently represents a straight-chain or branched-chain alkyl group 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-, -CH2O- or -OCH2-; Ring and the ring each independently represents said one or more of -CH2- therein may be replaced by -O-. When the ring and the ring are both then R M1 or R M2 is not an alkenyl group; Ring and the ring each independently represents the one or more of -CH2- in the said can be replaced by -O-, and at most one -H in the said Ring 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, said at most one -H in may be substituted 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, and Z M5 are the same or different.

7. The liquid crystal composition according to claim 6, wherein 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.

8. The liquid crystal composition according to claim 2, characterized in that, the compound of general formula I is selected from the group consisting of at least one of the following compounds: and Among them, R N11 represents a straight-chain alkoxy group having 1 to 8 carbon atoms; R N12 represents a straight-chain alkenyl group having 2 to 8 carbon atoms; R N2 represents a straight-chain alkyl group having 1 to 8 carbon atoms.

9. The liquid crystal composition according to claim 3, 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 having 1 to 10 carbon atoms, a straight-chain or branched-chain alkoxy group having 1 to 10 carbon atoms, R B110 、R B210 、R B120 and R B220 each independently represents a linear or branched alkenyl group having 2 to 10 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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