Liquid crystal composition and liquid crystal display device comprising same

Abstract

The invention provides a liquid crystal composition and a liquid crystal display device comprising the same. The liquid crystal composition comprises at least one compound with an alkenyl terminal group as shown in a general formula I and at least one compound with a dibenzo pentacyclic structure as shown in a general formula II. The liquid crystal composition provided by the invention has larger elastic constant, smaller rotary viscosity, smaller ratio of rotary viscosity to elastic constant, better contrast ratio, higher response speed and wider nematic phase temperature range under the condition of maintaining a proper clearing point and proper absolute values of optical anisotropy and dielectric anisotropy; the overall performance of the liquid crystal material is effectively improved, and the liquid crystal material is suitable for 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 liquid crystal composition and a liquid crystal display device comprising the same. Background Art

[0002] Liquid Crystal Displays (LCDs) have developed rapidly due to their small size, light weight, low power consumption and excellent display quality, and have been widely used especially in portable electronic information products. With the increase in the size of liquid crystal screens for portable computers, office applications and video applications, liquid crystal displays can be used for large-screen displays and finally replaced the Cathode Ray Tube (CRT) displays.

[0003] Liquid crystal materials are mixtures composed of organic rod-shaped small molecule compounds that have both the fluidity of a liquid and the anisotropy of a crystal at a certain temperature. Liquid crystal display devices work by utilizing the optical anisotropy and dielectric anisotropy inherent in the liquid crystal materials.

[0004] Compared with traditional display devices and display materials, liquid crystal display materials have obvious advantages: low driving voltage, tiny power consumption, high reliability, large display information capacity, color display, no flicker, harmless to humans, automated production process, low cost, can be made into various specifications and types of liquid crystal displays, easy to carry, etc. Due to these advantages, liquid crystal display technology has had a profound impact on the field of display and imaging, and promoted the development of microelectronics technology and optoelectronic information technology. Liquid crystal materials have been widely used in many display applications due to their good optical properties and photoelectric effects.

[0005] Currently, there are still some problems that need to be solved urgently in liquid crystal display materials, such as, the absolute value of the dielectric anisotropy is not large enough, the viscosity is not low enough, and there is still a large room for improvement in the contrast and elastic constant.

[0006] 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. For example, a liquid crystal display device containing a liquid crystal composition with a large absolute value of dielectric anisotropy can reduce the threshold voltage value, reduce the driving voltage, and further reduce the power consumption. At the same time, a large absolute value of dielectric anisotropy will result in a relatively large viscosity and poor stability of the liquid crystal. A liquid crystal composition with a small viscosity can improve the response speed of the liquid crystal display device. When the response speed of the liquid crystal display device is fast, it can be applied to animation display. In addition, when injecting the liquid crystal composition into the liquid crystal cell of the liquid crystal display element, the injection time can be shortened, and the workability can be improved. The rotational viscosity directly affects the response time of the liquid crystal composition after power-on. Therefore, preparing a liquid crystal material with suitable properties in all aspects often requires creative labor. Summary of the Invention

[0007] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a liquid crystal composition and a liquid crystal display device containing the same. The liquid crystal composition of the present invention has a large elastic constant (K 11 and K ave ), a small rotational viscosity γ1, a smaller ratio of rotational viscosity to elastic constant (γ1 / K 11 ), good contrast, fast response speed, and a wide nematic phase temperature range while maintaining an appropriate clearing point, appropriate optical anisotropy, and absolute value of dielectric anisotropy, effectively improving the overall performance of the liquid crystal material, and is applicable to display modes such as VA, PSVA, IPS, and NFFS.

[0008] To achieve this purpose, the present invention adopts the following technical solutions:

[0009] In the first aspect, the present invention provides a liquid crystal composition, which comprises at least one (for example, it can be two, three, four) compound represented by general formula I and at least one (for example, it can be two, three, four) compound represented by general formula II:

[0010] and

[0011]

[0012] wherein, R1 represents a straight-chain or branched-chain alkenyl group containing 2-12 (for example, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms;

[0013] R2 represents a straight-chain or branched-chain alkyl group containing 1-12 (for example, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, One or at least two non - adjacent -CH2- in the straight - chain or branched - chain alkyl group containing 1 - 12 carbon atoms can each independently be replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO - O- or -O - CO-;

[0014] ring and ring each independently represents ring and ring at least one of which is

[0015] R3 and R4 each independently represent -H, halogen, a straight - chain or branched - chain alkyl group containing 1 - 12 (such as 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms, the straight - chain or branched - chain alkyl group containing 1 - 12 carbon atoms, one or at least two non - adjacent -CH2- in which can each independently be replaced by -CH=CH-, -C≡C-, -O-, -S-, -CO-, -CO - O- or -O - CO-, and one or at least two -H in the foregoing groups can each independently be replaced by -F or -Cl;

[0016] Z1 and Z2 each independently represent a single bond, -O-, -S-, -CO - O-, -O - CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, -CF2CF2-, -(CH2)4-, -CF2O- or -OCF2-;

[0017] Z3 represents a single bond, -O(CH2) a - or -S(CH2) a -; a represents an integer from 0 to 3, for example, it can be 0, 1, 2 or 3;

[0018] ring and ring each independently represents the one or at least two -CH2- in which can be replaced by -O-, and one or at most two non - adjacent single bonds in the ring can be replaced by double bonds; the one or at least two -H in which can be replaced by -F, -Cl, -CN, -CH3 or -OCH3, and one or at least two -CH= in the ring can be replaced by -N=;

[0019] G represents -O-, -S-, -CF2-, -NH-, -NF- or -CO-;

[0020] X1 and X2 each independently represent -H, a halogen, a halogenated or unhalogenated alkyl group having 1 to 3 (e.g., 1, 2, or 3) carbon atoms, or a halogenated or unhalogenated alkoxy group having 1 to 3 (e.g., 1, 2, or 3) carbon atoms;

[0021] n1 and n2 each independently represent 0, 1, or 2; when n1 = 2, there are two rings in the compound which may be the same or different, and Z1 may be the same or different; when n2 = 2, the rings which may be the same or different, and Z2 may be the same or different.

[0022] The alkenyl group in the present invention is preferably a group represented by any one of formulas (V1) to (V9), particularly preferably formula (V1), formula (V2), formula (V8), or (V9). The groups represented by formulas (V1) to (V9) are shown as follows:

[0023] wherein, "x" represents a carbon atom in the ring structure to which it is bonded.

[0024] The alkenyloxy group in the present invention is preferably a group represented by any one of formulas (OV1) to (OV9), particularly preferably formula (OV1), formula (OV2), formula (OV8), or (OV9). The groups represented by formulas (OV1) to (OV9) are shown as follows:

[0025]

[0026] wherein, "x" represents a carbon atom in the ring structure to which it is bonded.

[0027] In the present invention, the 1 to 12 carbon atoms may be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12 carbon atoms.

[0028] When n1 = 2, there are two rings in the compound These two rings may have the same structure or different structures. Exemplarily, one may be and the other may be When the present invention relates to the expression "the same or different", it has the same meaning.

[0029] In the present invention, "may be each independently substituted by..." means that it may be substituted or may not be substituted, that is, both substitution and non-substitution are within the protection scope of the present invention. The same applies to "may be each independently replaced by...", and the positions of "substitution" and "replacement" can be arbitrary.

[0030] 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 line on the left, the short straight lines on both sides.

[0031] In the present invention, the halogen includes fluorine, chlorine, bromine, iodine, etc.; when the same description is involved hereinafter, it has the same meaning.

[0032] The following are the preferred technical solutions of the present invention, but do not limit the technical solutions provided by the present invention. Through the following preferred technical solutions, the objectives and beneficial effects of the present invention can be better achieved and realized.

[0033] In some embodiments of the present invention, the compound represented by the general formula I is selected from the group consisting of the following compounds:

[0034] and

[0035]

[0036] Among them, R1 has the same defined range as the compound represented by the above general formula I;

[0037] R2 represents a straight-chain alkyl group containing 1-10 (such as 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10) carbon atoms, a straight-chain alkoxy group containing 1-10 (such as 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10) carbon atoms, and

[0038] R 21 represents a straight-chain alkenyl group containing 2-10 (such as 2, 3, 4, 5, 6, 7, 8, 9 or 10) carbon atoms.

[0039] In some embodiments of the present invention, R1 represents a straight-chain alkenyl group containing 2-8 carbon atoms, and is further preferably any one of the groups represented by formulas (V1) to (V9).

[0040] In some embodiments of the present invention, R1 represents "x" represents the carbon atom in the ring structure to which it is bonded.

[0041] In some embodiments of the present invention, R2 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 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched-chain alkenyl group having 2-8 (e.g., 2, 3, 4, 5, 6, 7, or 8) carbon atoms.

[0042] In some embodiments of the present invention, in order to obtain a larger elastic constant, a smaller rotational viscosity, a smaller ratio of rotational viscosity to elastic constant, a better contrast, and a faster response speed, the compound represented by General Formula I comprises at least one (e.g., one, two, three, four, or five) compound selected from the group consisting of the compounds represented by General Formula I-1 and General Formula I-4.

[0043] In some embodiments of the present invention, in order to obtain a larger elastic constant, a smaller rotational viscosity, a smaller ratio of rotational viscosity to elastic constant, a better contrast, and a faster response speed, the compound represented by General Formula I comprises at least one (e.g., one, two, three, four, or five) compound selected from the group consisting of the following compounds:

[0044] and

[0045]

[0046] wherein, R2 represents a straight-chain alkyl group having 1-10 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10) carbon atoms, a straight-chain alkoxy group having 1-10 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10) carbon atoms.

[0047]

[0048] 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 it has a larger elastic constant, a smaller rotational viscosity, a smaller ratio of rotational viscosity to elastic constant, a better contrast, and a faster response speed while maintaining an appropriate clearing point, an appropriate optical anisotropy, and an absolute value of dielectric anisotropy.

[0049] In some embodiments of the present invention, the weight percentage of the compound represented by the 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%, 0.5%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 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 weight percentage of the compound represented by the general formula I in the liquid crystal composition is 1% - 35%.

[0050] In some embodiments of the present invention, the weight percentage of the compound containing at least one (e.g., one, two, three, four, or five) compound selected from the group consisting of the compound represented by the general formula I-1, the compound represented by the general formula I-4, and the compound represented by the general formula I-6 in the liquid crystal composition is 1% - 35% (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%, or the range between any two of these values.

[0051] In some embodiments of the present invention, the weight percentage of the compound containing at least one (e.g., one, two, three, four, or five) compound selected from the group consisting of the compound represented by the general formula I-1-1, the compound represented by the general formula I-1-2, the compound represented by the general formula I-4-1, the compound represented by the general formula I-4-2, the compound represented by the general formula I-6-1, the compound represented by the general formula I-6-2, and the compound represented by the general formula I-6-3 in the liquid crystal composition 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.

[0052] In some embodiments of the present invention, G represents -O- or -S-.

[0053] In some embodiments of the present invention, X1 and X2 represent -F.

[0054] In some embodiments of the present invention, the compound represented by General Formula II is selected from the group consisting of the following compounds:

[0055]

[0056] and

[0057]

[0058] wherein, R3, R4, Z1 and Z3 have the same defined ranges as those in the compound represented by General Formula II above;

[0059] Y1 and Y2 each independently represent -O- or -CH2-.

[0060] In some embodiments of the present invention, R3 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 straight-chain alkoxy group having 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms, and is further preferably a straight-chain alkoxy group having 1 to 6 carbon atoms.

[0061] In some embodiments of the present invention, Z3 represents a single bond, -O-, -OCH2- or -OCH2CH2-.

[0062] In some embodiments of the present invention, R4 represents a straight-chain alkyl group having 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms, a straight-chain alkoxy group having 1 to 6 (e.g., 1, 2, 3, 4, 5 or 6) carbon atoms,

[0063] In some embodiments of the present invention, in order to obtain a larger elastic constant, a smaller rotational viscosity, a smaller ratio of rotational viscosity to elastic constant, a better contrast, and a faster response speed, the compound represented by General Formula II comprises at least one (e.g., one, two, three, four or five) compound selected from the group consisting of the compounds represented by General Formula II-1 and the compounds represented by General Formula II-2.

[0064] In some embodiments of the present invention, in order to obtain a larger elastic constant, a smaller rotational viscosity, a smaller ratio of rotational viscosity to elastic constant, a better contrast, and a faster response speed, the compound represented by General Formula II comprises at least one (e.g., one, two, three, four or five) compound selected from the group consisting of the following compounds:

[0065]

[0066] and

[0067]

[0068] wherein, R4' represents a straight-chain alkyl group having 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms, and is further preferably a straight-chain alkyl group having 1 to 4 carbon atoms;

[0069] ring represents

[0070] In some embodiments of the present invention, it is preferred to adjust the content of the compound of general formula II such that the liquid crystal composition containing it has a large elastic constant, a small rotational viscosity, a smaller ratio of rotational viscosity to elastic constant, a good contrast, and a fast response speed while maintaining an appropriate clearing point, an appropriate optical anisotropy, and an absolute value of dielectric anisotropy.

[0071] In some embodiments of the present invention, the weight percentage of the compound represented by general formula II in the liquid crystal composition is 0.1% - 40% (including any value or sub-range within this range), for example, 0.1%, 0.5%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, or the range between any two of these values. Preferably, the weight percentage of the compound of general formula I in the liquid crystal composition is 1% - 30%.

[0072] In some embodiments of the present invention, the weight percentage of the compound containing at least one (e.g., one, two, three, four or five) compound selected from the group consisting of the compounds represented by general formula II-1 and general formula II-2 in the liquid crystal composition is 1% - 25% (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%, or the range between any two of these values.

[0073] In some embodiments of the present invention, the compound(s) comprising at least one (e.g., two, three, four, or five) selected from the group consisting of the compounds represented by General Formula II-1A, the compounds represented by General Formula II-1B, the compounds represented by General Formula II-1C, the compounds represented by General Formula II-2A, the compounds represented by General Formula II-2B, and the compounds represented by General Formula II-2C accounts for 1%-20% (including any value or sub-range within this range) of the weight of the liquid crystal composition, for example, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, or the range between any two of these values.

[0074] In some embodiments of the present invention, the liquid crystal composition further comprises at least one (e.g., two, three, four, or five) compound represented by General Formula M:

[0075]

[0076] Wherein, R M1 and R M2 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 at least two non-adjacent -CH2- in the straight-chain or branched-chain alkyl group containing 1-12 carbon atoms may each independently be replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-;

[0077] ring ring and ring each independently represents the one or at least two -CH2- in which may be replaced by -O-, one or at most two single bonds in the ring may be replaced by double bonds, and at most one -H in the may be replaced by a halogen;

[0078] Z M1 and Z M2 each independently represents a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CF2CF2-, -CF2O-, -CH2CH2-, or -(CH2)4-;

[0079] n M represents 0, 1, 2, or 3, where when n M = 2 or 3, the rings are the same or different, ZM2 are the same or different, when n M represents 0, the ring and the ring is not

[0080] In some embodiments of the present invention, the compound represented by the general formula M is selected from the group consisting of the following compounds:

[0081]

[0082]

[0083]

[0084]

[0085] and

[0086]

[0087] wherein, R M1 and R M2 each independently represents a straight-chain or branched-chain alkyl group containing 1-10 (such as 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10) carbon atoms, and one or at least two non-adjacent -CH2- in the straight-chain or branched-chain alkyl group containing 1-10 carbon atoms can each independently be replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-.

[0088] In some embodiments of the present invention, the R M1 and R M2 each independently represents a straight-chain alkyl group containing 1-8 (such as 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms, a branched-chain alkyl group containing 3-8 (such as 3, 4, 5, 6, 7 or 8) carbon atoms, a straight-chain alkoxy group containing 1-8 (such as 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms, a branched-chain alkoxy group containing 3-8 (such as 3, 4, 5, 6, 7 or 8) carbon atoms, a straight-chain alkenyl group containing 2-8 (such as 2, 3, 4, 5, 6, 7 or 8) carbon atoms or a branched-chain alkenyl group containing 3-8 (such as 3, 4, 5, 6, 7 or 8) carbon atoms.

[0089] In some embodiments of the present invention, in order to obtain a larger elastic constant, a smaller rotational viscosity, a smaller ratio of rotational viscosity to elastic constant, a better contrast, and a faster response speed, the compound represented by general formula M comprises at least one (e.g., one, two, three, four, or five) compound selected from the group consisting of the compounds represented by general formula M-1, general formula M-10, general formula M-18, general formula M-26, and general formula M-43.

[0090] In some embodiments of the present invention, in order to obtain a larger elastic constant, a smaller rotational viscosity, a smaller ratio of rotational viscosity to elastic constant, a better contrast, and a faster response speed, the compound represented by general formula M comprises at least one (e.g., one, two, three, four, or five) compound selected from the group consisting of the following compounds:

[0091]

[0092] and

[0093]

[0094] wherein, R M1 and R M2 each independently represents a straight-chain alkyl group having 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, or a branched-chain alkyl group having 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms;

[0095] R M11 and R M21 each independently represents 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;

[0096] R M22 represents 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.

[0097] In some embodiments of the present invention, it is preferred to adjust the content of the compound of general formula M such that the liquid crystal composition containing it has a larger elastic constant, a smaller rotational viscosity, a smaller ratio of rotational viscosity to elastic constant, a better contrast, and a faster response speed while maintaining an appropriate clearing point, appropriate optical anisotropy, and absolute value of dielectric anisotropy.

[0098] In some embodiments of the present invention, the weight percentage of the compound represented by the general formula M in the liquid crystal composition is 0.1% - 60% (including any value or sub-range within this range), for example, 0.1%, 1%, 3%, 5%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 17%, 18%, 20%, 22%, 23%, 24%, 25%, 27%, 28%, 30%, 31%, 32%, 33%, 35%, 37%, 38%, 40%, 42%, 44%, 45%, 46%, 48%, 50%, 52%, 55%, 56%, 58%, 60%, or the range between any two of these values. Preferably, the weight percentage of the compound represented by the general formula M in the liquid crystal composition is 1% - 45%.

[0099] In some embodiments of the present invention, the weight percentage of the compound containing at least one (for example, two, three, four, or five) selected from the group consisting of the compounds represented by the general formula M-1, the general formula M-10, the general formula M-18, the general formula M-26, and the general formula M-43 in the liquid crystal composition is 0.1% - 45% (including any value or sub-range within this range), for example, 0.1%, 1%, 3%, 5%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 17%, 18%, 20%, 22%, 23%, 24%, 25%, 27%, 28%, 30%, 31%, 32%, 33%, 35%, 37%, 38%, 40%, 42%, 44%, 45%, or the range between any two of these values.

[0100] In some embodiments of the present invention, the weight percentage of the compound containing at least one (for example, two, three, four, or five) selected from the group consisting of the compounds represented by the general formula M-1-2, the general formula M-10-2, the general formula M-18-1, the general formula M-26-2, and the general formula M-43-1 in the liquid crystal composition is 1% - 45% (including any value or sub-range within this range), for example, 1%, 3%, 5%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 17%, 18%, 20%, 22%, 23%, 24%, 25%, 27%, 28%, 30%, 31%, 32%, 33%, 35%, 37%, 38%, 40%, 42%, 44%, 45%, or the range between any two of these values.

[0101] In some embodiments of the present invention, the liquid crystal composition further comprises at least one compound represented by the general formula N:

[0102]

[0103] Among them, R E1 and R E2 each independently represent a straight-chain or branched-chain alkyl group having 1 to 12 (such as 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, one or at least two non-adjacent -CH2- in the straight-chain or branched-chain alkyl group having 1 to 12 carbon atoms can each independently be replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-;

[0104] Ring and Ring each independently represent wherein one or at least two -CH2- in the can be replaced by -O-, one or at most two single bonds in the ring can be replaced by double bonds, wherein one or at least two -H in the can each independently be replaced by -F, -Cl, or -CN, and one or at least two -CH= in the ring can be replaced by -N=;

[0105] Z E1 and Z E2 each independently represent a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, -CF2CF2-, -(CH2)4-, -CF2O-, or -OCF2-;

[0106] L E1 and L E2 each independently represent -H, a halogen, an alkyl group having 1 to 3 (such as 1, 2, or 3) carbon atoms, an alkoxy group having 1 to 3 (such as 1, 2, or 3) carbon atoms;

[0107] n E1 represents 0, 1, 2, or 3, n E2 represents 0 or 1, and 0 ≤ n E1 + n E2 ≤ 3; when n E1 represents 2 or 3, Ring are the same or different, Z E1 are the same or different.

[0108] In some embodiments of the present invention, the L E1 and L E2 both represent -H.

[0109] In some embodiments of the present invention, the Z E1 and Z E2Each independently represents a single bond, -CO-O-, -CH2O-, -C≡C-, -CH=CH- or -CH2CH2-.

[0110] In some embodiments of the present invention, the compound represented by the general formula N is selected from the group consisting of the following compounds:

[0111]

[0112]

[0113]

[0114]

[0115] and

[0116]

[0117] wherein, the R E1 and R E2 have the same defined range as R E1 and R E2 in the compound represented by the general formula N.

[0118] In some embodiments of the present invention, the R E1 and R E2 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., 1, 2, 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.

[0119] In some embodiments of the present invention, the R E1 represents a straight-chain alkyl group having 1-5 carbon atoms, a straight-chain alkoxy group having 1-5 carbon atoms or a straight-chain alkenyl group having 2-5 carbon atoms.

[0120] In some embodiments of the present invention, the R E2 represents a straight-chain alkyl group having 1-5 carbon atoms or a straight-chain alkoxy group having 1-5 carbon atoms.

[0121] In some embodiments of the present invention, in order to obtain a larger elastic constant, a smaller rotational viscosity, a smaller ratio of rotational viscosity to elastic constant, a better contrast, and a faster response speed, the compound represented by the general formula N contains at least one (e.g., one, two, three, four, or five) compound selected from the group consisting of the compounds represented by the general formula N-1, the compound represented by the general formula N-2, the compound represented by the general formula N-3, the compound represented by the general formula N-8, the compound represented by the general formula N-9, the compound represented by the general formula N-13, the compound represented by the general formula N-16, the compound represented by the general formula N-20, the compound represented by the general formula N-23, the compound represented by the general formula N-25, the compound represented by the general formula N-27, the compound represented by the general formula N-34, and the compound represented by the general formula N-43.

[0122] In some embodiments of the present invention, it is preferred to adjust the content of the compound of the general formula N such that the liquid crystal composition containing it has a larger elastic constant, a smaller rotational viscosity, a smaller ratio of rotational viscosity to elastic constant, a better contrast, and a faster response speed while maintaining an appropriate clearing point, an appropriate optical anisotropy, and an absolute value of dielectric anisotropy.

[0123] In some embodiments of the present invention, the weight percentage of the compound of the general formula N in the liquid crystal composition is 0.1%-70% (including any value or sub-range within this range), e.g., 0.1%, 1%, 2%, 4%, 6%, 8%, 10%, 11%,

[0124] 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, 50%, 52%, 54%, 56%, 58%, 60%, 62%, 64%, 66%,

[0125] 68%, 70%, or the range between any two of these values. Preferably, the weight percentage of the compound of the general formula I in the liquid crystal composition is 1%-60%.

[0126] In some embodiments of the present invention, the compound(s) comprising at least one (e.g., two, three, four, or five) selected from the group consisting of the compounds represented by general formula N-1, the compounds represented by general formula N-2, the compounds represented by general formula N-3, the compounds represented by general formula N-8, the compounds represented by general formula N-9, the compounds represented by general formula N-13, the compounds represented by general formula N-16, the compounds represented by general formula N-20, the compounds represented by general formula N-23, the compounds represented by general formula N-25, the compounds represented by general formula N-27, the compounds represented by general formula N-34, and the compounds represented by general formula N-43 accounts for 1% - 60% (including any value or sub-range within this range) of the weight of the liquid crystal composition. For example, 1%, 2%, 4%, 6%, 8%, 10%, 11%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, 50%, 52%, 54%, 56%, 58%, 60%, or the range between any two of these values.

[0127] 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 a nematic liquid crystal, a smectic liquid crystal, a cholesteric liquid crystal, a polymerizable monomer, and an additive.

[0128] In some embodiments of the present invention, the liquid crystal composition further includes at least one additive.

[0129] 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.

[0130] In some embodiments of the present invention, the dopant is selected from any one or a combination of at least two of the following compounds:

[0131]

[0132] And

[0133]

[0134] wherein, * represents a chiral site.

[0135] In some embodiments of the present invention, the weight percentage of the dopant in the liquid crystal composition is 0% - 5%; preferably, the weight percentage of the dopant in the liquid crystal composition is 0.01% - 1%.

[0136] In some embodiments of the present invention, the additives such as the antioxidant, the light stabilizer, and the ultraviolet absorber are preferably the following compounds:

[0137]

[0138]

[0139]

[0140] Among them, n represents a positive integer from 1 to 12, and n2 represents a positive integer from 1 to 18; "+" represents a free radical. Preferably, the light stabilizer is selected from the light stabilizers shown below:

[0141]

[0142] In some embodiments of the present invention, the weight percentage of the light stabilizer in the liquid crystal composition is 0% - 5%; preferably, the weight percentage of the light stabilizer in the liquid crystal composition is 0.01% - 1%, and more preferably 0.01% - 0.1%.

[0143] In a second aspect, the present invention provides a liquid crystal display device, and the liquid crystal display device includes the liquid crystal composition as described in the first aspect.

[0144] 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.

[0145] Compared with the prior art, the present invention has the following beneficial effects:

[0146] In the liquid crystal composition provided by the present invention, through the relevant compounding of the specific structure and content of the compound, the liquid crystal composition has a large elastic constant, a small rotational viscosity, a smaller ratio of rotational viscosity to elastic constant, a good contrast, a fast response speed, and a wide nematic phase temperature range while maintaining an appropriate clearing point, appropriate optical anisotropy, and absolute value of dielectric anisotropy, which helps to improve the overall performance of the liquid crystal material and is applicable to display modes such as VA, PSVA, IPS, and NFFS. Detailed Embodiments

[0147] To facilitate the understanding of the present invention, the following examples are listed for the present invention. Those skilled in the art should understand that the examples are only for helping to understand the present invention and should not be regarded as specific limitations on the present invention.

[0148] For the convenience of expression, in the following examples, the group structures of the components in the liquid crystal composition are represented by the codes listed in Table 1:

[0149] Table 1

[0150]

[0151]

[0152] In Table 1, the short keys represent the attachment sites of the groups.

[0153] Taking the compound with the following structural formula as an example:

[0154]

[0155] 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 cyclohexyl, G represents 2-fluoro-1,4-phenylene, and F represents fluorine.

[0156] In the following examples and comparative examples, the abbreviated codes for the performance test items are shown in Table 2:

[0157] Table 2 Abbreviated Codes for Performance Test Items

[0158]

[0159]

[0160] Among them:

[0161] Cp: Obtained by testing with a melting point instrument.

[0162] Δn: Δn = n e -n0, obtained by testing with an Abbe refractometer under the light source of a sodium lamp (589 nm) at 25°C.

[0163] 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: VA type test cell at 25°C, 1 KHz, and cell thickness of 6 μm.

[0164] 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 with an LCR meter and a VA test cell and performing calculations. Test conditions: VA type test cell with a thickness of 6 μm, V = 0.1 - 20 V.

[0165] γ1: Obtained by testing with an LCM-2 type liquid crystal physical property evaluation system; test conditions: 25°C, 160 - 240 V, and cell thickness of 20 μm.

[0166] CR: The transmittance of the liquid crystal cell, namely T, is measured using a DMS 505 tester at 255 gray-scale voltage and 0 gray-scale voltage respectively. r255 and T r0 , is obtained from T r255 / T r0 ; Test conditions: a negative FFS type test cell with 25 stripes and a cell thickness of 3 μm.

[0167] The compounds used in the following examples can all be synthesized by known methods or obtained through commercial channels. These synthetic techniques are conventional, and the obtained liquid crystal compositions are tested to meet the standards of electronic compounds.

[0168] Prepare the liquid crystal composition according to the ratio of each liquid crystal composition in the following examples. The preparation of the liquid crystal composition is carried out according to the conventional methods in the art, such as by heating, ultrasonic waves, suspension, etc. and mixing in accordance with the specified ratio.

[0169] Comparative Example 1

[0170] This comparative example provides a liquid crystal composition, which includes components with the weight percentages shown in the following table, and is filled between two substrates of a liquid crystal display for performance testing:

[0171]

[0172] Comparative Example 2

[0173] This comparative example provides a liquid crystal composition, which includes components with the weight percentages shown in the following table, and is filled between two substrates of a liquid crystal display for performance testing:

[0174]

[0175]

[0176] Example 1

[0177] This example provides a liquid crystal composition, which includes components with the weight percentages shown in the following table, and is filled between two substrates of a liquid crystal display for performance testing:

[0178]

[0179] Example 2

[0180] This example provides a liquid crystal composition, which includes components with the weight percentages shown in the following table, and is filled between two substrates of a liquid crystal display for performance testing:

[0181]

[0182]

[0183] Example 3

[0184] This example provides a liquid crystal composition. The liquid crystal composition comprises components in the weight percentages shown in the following table, and it is filled between two substrates of a liquid crystal display for performance testing:

[0185]

[0186] Example 4

[0187] This example provides a liquid crystal composition. The liquid crystal composition comprises components in the weight percentages shown in the following table, and it is filled between two substrates of a liquid crystal display for performance testing:

[0188]

[0189] Example 5

[0190] This example provides a liquid crystal composition. The liquid crystal composition comprises components in the weight percentages shown in the following table, and it is filled between two substrates of a liquid crystal display for performance testing:

[0191]

[0192]

[0193] Example 6

[0194] This example provides a liquid crystal composition. The liquid crystal composition comprises components in the weight percentages shown in the following table, and it is filled between two substrates of a liquid crystal display for performance testing:

[0195]

[0196] Example 7

[0197] This example provides a liquid crystal composition. The liquid crystal composition comprises components in the weight percentages shown in the following table, and it is filled between two substrates of a liquid crystal display for performance testing:

[0198]

[0199]

[0200] Example 8

[0201] This embodiment provides a liquid crystal composition. The liquid crystal composition comprises components in the weight percentages shown in the following table, and is filled between two substrates of a liquid crystal display for performance testing:

[0202]

[0203] Example 9

[0204] This embodiment provides a liquid crystal composition. The liquid crystal composition comprises components in the weight percentages shown in the following table, and is filled between two substrates of a liquid crystal display for performance testing:

[0205]

[0206]

[0207] From the comparison between the embodiments and comparative examples of this application, it can be seen that through the relevant compounding of the specific structure and content of the compound, the liquid crystal composition has a large elastic constant (K 11 : 15.7 - 18.9, K ave : 14.8 - 17.8), a small rotational viscosity γ1 (83 - 102), a smaller ratio of rotational viscosity to elastic constant (γ1 / K 11 )(4.83 - 5.58), a good contrast ratio (1730 - 2410), and a fast response speed while maintaining an appropriate clearing point (74.9 - 92.4 °C), an appropriate optical anisotropy (0.0975 - 0.1169), and an absolute value of dielectric anisotropy (3.1 - 5.6). The nematic phase temperature range is wider and the contrast ratio is better, which helps to improve the overall performance of the liquid crystal material and is applicable to display modes such as VA, PSVA, IPS, and NFFS.

[0208] The applicant declares that the present invention uses the above embodiments to illustrate the detailed process flow of the present invention, but the present invention is not limited to the above detailed process flow, that is, it does not mean that the present invention must rely on the above detailed process flow to be implemented. Those skilled in the art should understand that any improvement to the present invention, the equivalent substitution of each raw material of the product of the present invention, the addition of auxiliary components, the selection of specific methods, etc., all fall within the protection scope and the disclosure scope of the present invention.

Claims

1. A liquid crystal composition, characterized in that, The liquid crystal composition contains at least one compound represented by General Formula I and at least one compound represented by General Formula II: and Wherein, R1 represents a straight-chain or branched alkenyl group containing 2 to 12 carbon atoms; R2 represents a straight-chain or branched alkyl group having 1 to 12 carbon atoms, one or at least two non-adjacent -CH2- in the straight-chain or branched alkyl group having 1 to 12 carbon atoms may each independently be replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-; Ring and a ring each independently represents a ring and a ring at least one of which is R3 and R4 each independently represent -H, halogen, a straight-chain or branched alkyl group having 1 to 12 carbon atoms, the straight-chain or branched alkyl group having 1 to 12 carbon atoms, one or at least two non-adjacent -CH2- in the above can each independently be replaced by -CH=CH-, -C≡C-, -O-, -S-, -CO-, -CO-O- or -O-CO-, and one or at least two -H in the foregoing groups can each independently be replaced by -F or -Cl; Z1 and Z2 each independently represent a single bond, -O-, -S-, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH═CH-, -C≡C-, -CH2CH2-, -CF2CF2-, -(CH2)4-, -CF2O- or -OCF2-; Z3 represents a single bond, -O(CH2) a - or -S(CH2) a -; a represents an integer from 0 to 3; Ring and the ring each independently represents the one or at least two -CH2- in the said can be replaced by -O-, and the single bond in one or at most two non-adjacent rings can be replaced by a double bond; the one or at least two -H in the said can be replaced by -F, -Cl, -CN, -CH3 or -OCH3, and -CH= in one or at least two rings can be replaced by -N=; G represents -O-, -S-, -CF2-, -NH-, -NF- or -CO-; X1 and X2 each independently represent -H, a halogen, a halogenated or unhalogenated alkyl group containing 1 to 3 carbon atoms, or a halogenated or unhalogenated alkoxy group containing 1 to 3 carbon atoms; n1 and n2 each independently represent 0, 1 or 2; when n1 = 2, the ring are the same or different, and Z1 are the same or different; when n2 = 2, the ring are the same or different, and Z2 are the same or different.

2. In the liquid crystal composition according to claim 1, wherein The compound represented by General Formula I is selected from the group consisting of the following compounds: and Wherein, R1 has the same defined range as that in the compound represented by General Formula I in Claim 1; R2 represents a straight-chain alkyl group having 1 to 10 carbon atoms, a straight-chain alkoxy group having 1 to 10 carbon atoms, R 21 represents a linear alkenyl group having 2 to 10 carbon atoms.

3. The liquid crystal composition according to claim 1, characterized in that, The compound represented by General Formula I accounts for 0.1% - 50% by weight of the liquid crystal composition.

4. The liquid crystal composition according to claim 1, characterized in that, The compound represented by General Formula II is selected from the group consisting of the following compounds: and Wherein, R3, R4, Z1 and Z3 have the same defined ranges as those in Claim 1; Y1 and Y2 each independently represent -O- or -CH2-.

5. The liquid crystal composition according to claim 1, wherein The compound represented by General Formula II accounts for 0.1% - 40% by weight of the liquid crystal composition.

6. The liquid crystal composition according to claim 1, wherein The liquid crystal composition further contains at least one compound represented by General Formula M: wherein, R M1 and R M2 each independently represents a straight-chain or branched-chain alkyl group having 1 to 12 carbon atoms, one or at least two non-adjacent -CH2- in the straight-chain or branched-chain alkyl group having 1 to 12 carbon atoms may each independently be replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-; Ring Ring and the ring each independently represents the one or at least two -CH2- in the said 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 said can be replaced by a halogen; Z M1 and Z M2 each independently represents a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH═CH-, -C≡C-, -CF2CF2-, -CF2O-, -CH2CH2- or -(CH2)4-; n M represents 0, 1, 2 or 3, where when n M = 2 or 3, the rings are the same or different, Z M2 are the same or different, when n M represents 0, the rings and the rings are not The compound represented by General Formula M accounts for 0.1% - 60% by weight of the liquid crystal composition.

7. The liquid crystal composition according to claim 6, wherein The compound represented by General Formula M is selected from the group consisting of the following compounds: and Wherein, R M1 and R M2 each independently represents a straight-chain or branched-chain alkyl group having 1 to 10 carbon atoms, and one or at least two non-adjacent -CH2- in the straight-chain or branched-chain alkyl group having 1 to 10 carbon atoms may each independently be replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-.

8. The liquid crystal composition according to claim 1, characterized in that, The liquid crystal composition further contains at least one compound represented by General Formula N: Wherein, R E1 and R E2 each independently represents a straight-chain or branched-chain alkyl group having 1 to 12 carbon atoms, one or at least two non-adjacent -CH2- in the straight-chain or branched-chain alkyl group having 1 to 12 carbon atoms may each independently be replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-; Ring and the ring each independently represents wherein one or at least two of the -CH2- can be replaced by -O-, and one or at most two single bonds in the ring can be replaced by double bonds, wherein one or at least two of the -H can each independently be replaced by -F, -Cl, or -CN, and one or at least two -CH= in the ring can be replaced by -N=; Z E1 and Z E2 each independently represents a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH═CH-, -C≡C-, -CH2CH2-, -CF2CF2-, -(CH2)4-, -CF2O- or -OCF2-; L E1 and L E2 each independently represents -H, halogen, an alkyl group having 1 to 3 carbon atoms, or an alkoxy group having 1 to 3 carbon atoms; n E1 represents 0, 1, 2, or 3, and n E2 represents 0 or 1, and 0 ≤ n E1 + n E2 ≤ 3; when n E1 represents 2 or 3, the rings are the same or different, and Z E1 are the same or different; The compound represented by General Formula N accounts for 0.1% - 70% by weight of the liquid crystal composition.

9. The liquid crystal composition according to claim 8, characterized in that, The compound represented by General Formula N is selected from the group consisting of the following compounds: and Among them, the said R E1 and R E2 have the same defined scope as that of claim 8.

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

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