Liquid crystal composition and liquid crystal display device

Abstract

The present invention provides a liquid crystal composition and a liquid crystal display device. The liquid crystal composition includes at least one compound represented by general formula I, at least one compound represented by general formula II, and at least one compound represented by general formula III. The liquid crystal composition according to the present invention has suitable optical anisotropy, a suitable clearing point, a suitable absolute value of dielectric anisotropy, a large K value, a small rotational viscosity, a short response time, high transmittance, high contrast, and a long low-temperature storage time. The liquid crystal display device manufactured using the composition has excellent performance, a fast response, and a high contrast, and is applicable to display modes such as VA, IPS, and NFFS.

Description

[Technical Field]

[0001] The present invention relates to the technical field of liquid crystal materials, specifically to a liquid crystal display device, and more specifically to a liquid crystal composition containing an alkenylbenzothiophene compound and a liquid crystal display device. [Background technology]

[0002] Liquid crystal displays (LCDs) have developed rapidly and are widely used in portable electronic information products due to their small size, light weight, low power consumption, and excellent display quality. As the size of LCD screens used in portable computers, office applications, and video applications has increased, LCDs have become usable for large-screen displays and have eventually replaced cathode ray tube (CRT) displays.

[0003] Compared with conventional display devices and display materials, liquid crystal display materials have obvious advantages, such as low driving voltage, low power consumption, high reliability, large display information capacity, color display, no flicker, harmless to the human body, automated manufacturing process, low cost, the ability to be manufactured into various specifications and types of liquid crystal displays, and portability. Due to these advantages, liquid crystal display technology has had a profound impact on the fields of display and development, and promoted the development of microelectronics technology and optoelectronic information technology. Due to their excellent optical performance and photoelectric effect, liquid crystal materials are widely used in many display situations. Therefore, research on liquid crystal materials is becoming increasingly in-depth.

[0004] As TFT LCDs are increasingly used, the demand for their performance is constantly increasing. To achieve high-quality display, faster response speeds, lower power consumption, and higher low-temperature reliability are required. In particular, in IPS LCD display mode, higher contrast and transmittance are also required. This means that liquid crystal materials are required to have higher contrast and transmittance, higher elastic constants, higher dielectric constants, and higher low-temperature reliability. To improve these properties, liquid crystal materials must be improved.

[0005] IPS mode transmittance formula T∝|Δε| / ε ⊥ (T represents the transmittance, "∝" represents the "inverse proportional" relationship, and ε ⊥ Based on the principle that Δε represents the dielectric constant in the direction perpendicular to the molecular axis, it is possible to try to reduce the Δε of the liquid crystal medium to improve the transmittance of the liquid crystal, but this generally limits the adjustable range of the driving voltage of the same product. In addition, the liquid crystal molecules tilt in the Z-axis direction under the action of the perpendicular component of the fringe field, which changes their optical anisotropy and leads to the formula

number

[0006] Meanwhile, based on measurements of the light leakage performance of conventional IPS-LCDs, it was discovered that the main causes of light leakage problems in LCD displays are light scattering (LC scattering), rubbing uniformity, light leakage from color filter films (CF / TFT scattering), and polarize ability, with light scattering accounting for 63% of the factors affecting light leakage performance. The relation LC Scattering ∝

number

[0007] The relationship between contrast (CR) and brightness (L) is CR=L 255 / L0 × 100%, where L 255 is the on-state luminance, and L0 is the off-state luminance. It can be seen that the change in L0 has a significant effect on CR. In the off-state, L0 is not related to the dielectric constant characteristics of the liquid crystal molecules, but is related to the LC scattering of the liquid crystal material itself. The smaller the LC scattering, the smaller L0 becomes, which significantly improves CR.

[0008] In view of the above situation, a general method for improving contrast and transmittance is to: (1) maintain the dielectric anisotropy Δε of the liquid crystal composition as it is, and to change ε ⊥ (2) The average elastic constant K of the liquid crystal composition can be increased. ave By increasing the value of ε, the degree of order of the liquid crystal molecules is increased, and light leakage is reduced, thereby improving the transmittance. However, the liquid crystal compositions provided by the prior art have a low ε ⊥ / △ε ratio is small, K ave Therefore, how to provide a liquid crystal composition that can solve the above problems remains a technical problem that needs to be solved urgently in this field. Summary of the Invention [Problem to be solved by the invention]

[0009] In view of the shortcomings of the prior art, the object of the present invention is to provide a liquid crystal composition and a liquid crystal display device.In the present invention, by designing a specific composition of the liquid crystal composition, and further by combining the compound of general formula I containing a cycloalkenyl group with the compound of general formula II and the compound of general formula III, the prepared liquid crystal composition has suitable optical anisotropy, suitable clearing point, suitable absolute value of dielectric anisotropy, large K value, small rotational viscosity, short response time, high transmittance, high contrast and long low-temperature storage time, so that the liquid crystal display device comprising the liquid crystal composition of the present invention has a wide temperature range, low threshold voltage, good contrast, fast response speed, fast refresh rate and high transmittance, and is applicable to display modes such as VA, IPS and NFFS, which have fast response and high contrast. [Means for solving the problem]

[0010] To achieve this objective, the present invention employs the following technical means.

[0011] In a first aspect, the present invention provides a liquid crystal composition, the liquid crystal composition comprising at least one compound of general formula I, at least one compound of general formula II and at least one compound of general formula III, [ka] In the formula, R1 is -H, a halogenated or non-halogenated straight chain alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, a halogenated or non-halogenated branched chain alkyl group containing 3 to 12 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, a halogenated or non-halogenated branched chain alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, a halogenated or non-halogenated alkoxy group containing 2 to 12 (for example, which may be 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms; a halogenated or non-halogenated alkenyl group containing 2 to 12 (for example, which may be 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms; a halogenated or non-halogenated alkenyloxy group containing 2 to 12 (for example, which may be 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms; [ka] represents R2 to R5 each independently represent a linear alkyl group containing 1 to 12 (for example, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, a branched alkyl group containing 3 to 12 (for example, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, an alkoxy group containing 1 to 12 (for example, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, an alkenyl group containing 2 to 12 (for example, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, an alkenyloxy group having 2 to 12 (for example, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, [ka] represents [ka] teeth, [ka] represents [ka] teeth, [ka] represents [ka] one or at least two -CH2- in the ring may be replaced by -O-, and one or at least two single bonds in the ring may be replaced by a double bond; [ka] one or at least two -H in the ring may each independently be replaced by -F, -Cl, -CN, -CH3, or -OCH3, and one or at least two -CH= in the ring may be replaced by -N=; [ka] teeth, [ka] represents [ka] One or at least two -CH2- in the ring may be replaced by -O-, one or at least two single bonds in the ring may be replaced by a double bond, and at least one [ka] wherein one or at least two single bonds may be replaced by a double bond; [ka] are each independently, [ka] represents [ka] one or at least two -H in the ring may each independently be replaced by -F, -Cl, -CN, -CH3, or -OCH3, and one or at least two -CH= in the ring may be replaced by -N=; L1 to L6 each independently represent a halogen atom; X1 and X2 each independently represent -O- or -S-; Z1 represents a single bond, -CO-O-, -O-CO-, -CHO-, -OCH-, -CH=CH-, -C≡C-, -CHCH-, -CFCF-, -(CH)-, -CFO- or -OCF-; n1 represents 0, 1 or 2, and when n1 represents 2, [ka] may be the same or different, Z1 may be the same or different, n2 represents 1 or 2, and when n2 represents 2, [ka] may be the same or different, and n3 represents 0, 1, 2 or 3, n4 represents 0 or 1, and 2≦n3+n4≦3, and when n3 represents 2 or 3, [ka] may be the same or different.

[0012] Negative liquid crystal monomer compounds containing cycloalkenyl groups are a new type of liquid crystal monomer material in recent years. Compared with traditional negative monomers, negative monomers containing cycloalkenyl groups have the advantages of good mutual solubility in liquid crystal mixtures, fast response, and large K value, and generally have suitable refractive index and clearing point, and have excellent effects in both positive and negative liquid crystal materials.

[0013] In the present invention, a liquid crystal composition produced by using a negative compound containing a cycloalkenyl group (a compound of general formula I) in combination with a compound of general formula II and / or a compound of general formula III has suitable optical anisotropy, a suitable clearing point, a suitable absolute value of dielectric anisotropy, a large K value (K 11 , K. 33 ), small rotational viscosity, short response time, high transmittance, high contrast, long low-temperature storage time, and excellent mutual solubility. Therefore, a liquid crystal display device including the liquid crystal composition of the present invention has a wide temperature range, a low threshold voltage, good contrast, a fast response speed, a fast refresh rate, and high transmittance, and is applicable to display modes such as VA, IPS, and NFFS, which have fast response times.

[0014] In the present invention, halogen atoms include fluorine atoms, chlorine atoms, bromine atoms and iodine atoms (the same applies hereinafter).

[0015] The following are preferred technical means of the present invention, but are not intended to limit the technical means provided by the present invention, and the objectives and beneficial effects of the present invention can be better achieved and realized by the following preferred technical means.

[0016] In some embodiments of the present invention, the compound of general formula I is [ka] Any one or a combination of at least two of the compounds having the structure wherein [ka] , R1, X1, X2, L1, L2 and Z1 have the same protection scope as above.

[0017] In some embodiments of the present invention, [ka] teeth, [ka] Represents.

[0018] In some embodiments of the present invention, both L1 and L2 represent a fluorine atom.

[0019] In some embodiments of the present invention, the compound of general formula I is compound I-1.

[0020] In some embodiments of the present invention, the liquid crystal composition comprises at least two compounds of general formula I above.

[0021] In some embodiments of the present invention, the weight percentage of the compound of general formula I in the liquid crystal composition is 0.1% to 30%, and may be, for example, 0.1%, 0.2%, 0.5%, 1%, 2%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, or 30%, more preferably 1% to 20%, and even more preferably 4% to 16%.

[0022] In some embodiments of the present invention, preferably, by adjusting the content of the compound of general formula I, a liquid crystal composition containing it has suitable optical anisotropy, suitable clearing point, suitable absolute value of dielectric anisotropy, large K value (K 11 , K. 33 ), has a small rotational viscosity, a short response time, a high transmittance, a high contrast and a long low-temperature storage time.

[0023] In some embodiments of the present invention, the compound of general formula II is [ka] Any one or a combination of at least two compounds having the structure wherein R2, R3, L3 and L4 have the same protection ranges as above.

[0024] In some embodiments of the present invention, both L3 and L4 represent a fluorine atom.

[0025] In some embodiments of the present invention, the liquid crystal composition comprises at least two (eg, may be three or four) compounds of general formula II.

[0026] In some embodiments of the present invention, the weight percentage of the compound of general formula II in the liquid crystal composition is 0.1% to 50%, and may be, for example, 0.1%, 0.2%, 0.5%, 1%, 2%, 5%, 10%, 15%, 20%, 25%, 30%, 36%, 40%, 45%, or 50%, and more preferably 15% to 36%.

[0027] In some embodiments of the present invention, preferably, by adjusting the content of the compound of general formula II, a liquid crystal composition containing it has a suitable optical anisotropy, a suitable clearing point, a suitable absolute value of dielectric anisotropy, a large K value (K 11 , K. 33 ), has a small rotational viscosity, a short response time, a high transmittance, a high contrast and a long low-temperature storage time.

[0028] In some embodiments of the present invention, the compound of general formula III is [ka] [ka] [ka] Any one or a combination of at least two compounds having the structure wherein R4, R5, L5 and L6 have the same protection ranges as above. In some embodiments of the present invention, both L5 and L6 represent a fluorine atom.

[0029] In some embodiments of the present invention, the liquid crystal composition comprises at least two (eg, may be three or four) compounds of the general formula III.

[0030] In some embodiments of the present invention, the liquid crystal composition comprises at least one (e.g., may be two or three) compound of general formula III, wherein R4 comprises an alkenyl group containing 2 to 12 (e.g., may be 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms.

[0031] In some embodiments of the present invention, the weight percentage of the compound of general formula III in the liquid crystal composition is 0.1% to 30%, and may be, for example, 0.1%, 0.2%, 0.5%, 1%, 3%, 5%, 7%, 10%, 12%, 15%, 18%, 20%, 23%, 25%, 27%, or 30%, and more preferably 3% to 15%.

[0032] In some embodiments of the present invention, preferably, by adjusting the content of the compound of general formula III, a liquid crystal composition containing it has a suitable optical anisotropy, a suitable clearing point, a suitable absolute value of dielectric anisotropy, a large K value (K 11 , K. 33 ), has a small rotational viscosity, a short response time, a high transmittance, a high contrast and a long low-temperature storage time.

[0033] In some embodiments of the present invention, the liquid crystal composition further comprises at least one compound of general formula N, [ka] In the formula, R N1 and R N2 are each independently a linear alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, a branched alkyl group containing 3 to 12 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, [ka] wherein one or at least two non-adjacent —CH— groups in the linear alkyl group containing 1 to 12 carbon atoms or the branched alkyl group containing 3 to 12 carbon atoms may each independently be replaced by —CH═CH—, —C≡C—, —O—, —CO—, —CO—O—, or —O—CO—; [ka] are each independently, [ka] represents [ka] one or at least two -CH2- groups may be replaced by -O-; [ka] one or at least two -H in the ring may each independently be replaced by -F, -Cl, or -CN, and one or at least two -CH= in the ring may each independently be replaced by -N=; Z N1 and Z N2 each independently represents a single bond, -CO-O-, -O-CO-, -CHO-, -OCH-, -CH=CH-, -C≡C-, -CHCH-, -CFCF-, -(CH)-, -CFO-, or -OCF-, L N1 and L N2each independently represents -H, an alkyl group containing 1 to 3 carbon atoms, or a halogen atom; n N1 represents 0, 1, 2 or 3, and n N2 represents 0 or 1, and 0≦n N1 +n N2 ≦3, and n N1 If represents 2 or 3, [ka] may be the same or different, and Z N1 may be the same or different, and The compound of general formula N does not contain a substituted or unsubstituted triphenyl group structure, and the substitution substituents are selected from -F, -Cl, or -CN.

[0034] In some embodiments of the present invention, the compound of general formula N is [ka] [ka] Any one or a combination of at least two compounds having the structure In the formula, R N1 and R N2 has the same scope of protection as above.

[0035] In some embodiments of the present invention, the compound of general formula N is selected from the group consisting of compounds of general formula N-2, compounds of general formula N-5, compounds of general formula N-10, compounds of general formula N-14, compounds of general formula N-16, and compounds of general formula N-19. In some embodiments of the present invention, the weight percentage of the compound of general formula III in the liquid crystal composition is 0.1% to 30%, and may be, for example, 0.1%, 0.2%, 0.5%, 1%, 2%, 5%, 7%, 10%, 12%, 15%, 18%, 20%, 23%, 25%, 27%, or 30%, and more preferably 5% to 25%.

[0036] In some embodiments of the present invention, preferably, by adjusting the content of the compound of general formula N, a liquid crystal composition containing it has a suitable optical anisotropy, a suitable clearing point, a suitable absolute value of dielectric anisotropy, a large K value (K 11 , K. 33 ), has a small rotational viscosity, a short response time, a high transmittance, a high contrast and a long low-temperature storage time.

[0037] In some embodiments of the present invention, the liquid crystal composition further comprises at least one compound of general formula M, [ka] In the formula, R M1 and R M2 are each independently a linear alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, a branched alkyl group containing 3 to 12 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, [ka] wherein one or at least two non-adjacent —CH— groups in the linear alkyl group containing 1 to 12 carbon atoms or the branched alkyl group containing 3 to 12 carbon atoms may each independently be replaced by —CH═CH—, —C≡C—, —O—, —CO—, —CO—O—, or —O—CO—; [ka] are each independently, [ka] represents [ka] one or at least two -CH2- in the ring may be replaced by -O-, and one or at least two single bonds in the ring may be replaced by a double bond; [ka] wherein at most one -H may be replaced by a halogen atom; Z M1 and Z M2 each independently represent a single bond, —CO—O—, —O—CO—, —CHO—, —OCH—, —C≡C—, —CH═CH—, —CHCH—, or —(CH)—; and n M represents 0, 1 or 2, n M If represents 2, [ka] may be the same or different, and Z M2 may be the same or different.

[0038] In some embodiments of the present invention, the compound of general formula M is [ka] [ka] Any one or a combination of at least two of the compounds having the structure In the formula, R M1 and R M2 has the same scope of protection as above.

[0039] In some embodiments of the invention, the compound of general formula M is selected from the group consisting of a compound of general formula M-1, a compound of general formula M-2, a compound of general formula M-4, a compound of general formula M-13, a compound of general formula M-15, and a compound of general formula M-28.

[0040] In some embodiments of the present invention, the weight percentage of the compound of general formula M in the liquid crystal composition is 0.1% to 60%, and may be, for example, 0.1%, 0.2%, 0.5%, 1%, 2%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, or 60%, and more preferably 30% to 50%.

[0041] In some embodiments of the present invention, the liquid crystal composition further comprises at least one compound of general formula B: [ka] In the formula, R B1 and R B2 each independently represents a halogen atom, a halogenated or non-halogenated straight-chain alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, a halogenated or non-halogenated branched-chain alkyl group containing 3 to 12 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, [ka] and the halogenated or non-halogenated linear alkyl group containing 1 to 12 carbon atoms, the halogenated or non-halogenated branched alkyl group containing 3 to 12 carbon atoms, [ka] one or two or more non-adjacent -CH2- groups may each independently be replaced by -CH=CH-, -CH=CF-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-; [ka] are each independently, [ka] represents [ka] one or at least two non-adjacent -CH2- groups in the ring may be replaced with -O-, and one or at least two single bonds in the ring may be replaced with a double bond; [ka] one or at least two -H in the ring may each independently be replaced by -CN, -F or -Cl, and one or at least two -CH= in the ring may each independently be replaced by -N=; X B represents -O-, -S- or -CO-; L B1 and L B2 each independently represents -H, -F, -Cl, -CF3, or -OCF3; Z B1 and Z B2 each independently represents a single bond, -CO-O-, -O-CO-, -CHO-, -OCH-, -CH=CH-, -C≡C-, -CHCH-, -CFCF-, or -(CH) B4 -, -(CH2)n B4 O-, -(CH2)n B4 represents S-, -CF2O- or -OCF2-, n B4 represents an integer of 0 to 5 (for example, it may be 0, 1, 2, 3, 4, or 5), n B1 and n B2 each independently represents 0, 1 or 2, B1 If represents 2, [ka] may be the same or different, and n B2 If represents 2, [ka] may be the same or different, and Z B2 may be the same or different.

[0042] In some embodiments of the present invention, the compound of general formula B is [ka] Any one or a combination of at least two of the compounds having the structure In the formula, R B1 ' represents an alkyl group containing 1 to 8 (for example, 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, an alkoxy group containing 1 to 8 (for example, 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, or an alkenyl group containing 2 to 8 (for example, 2, 3, 4, 5, 6, 7, or 8) carbon atoms; X B1 represents -O- or -CH2-, R B2 , X B and Z B1 has the same scope of protection as above.

[0043] In some embodiments of the present invention, the compound of general formula B-1 is [ka] Any one or a combination of at least two of the compounds having the structure In the formula, R B2 ' represents an alkyl group containing 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms; R B1 ', X B and n B4 has the same scope of protection as above. n B3 represents 1, 2, 3 or 4, n B5 represents 0, 1, 2, 3 or 4.

[0044] In some embodiments of the present invention, the weight percentage of the compound of general formula B in the liquid crystal composition is 0.1% to 20%, and may be, for example, 0.1%, 0.2%, 0.5%, 1%, 2%, 4%, 5%, 7%, 8%, 10%, 12%, 14%, 16%, 18%, or 20%, and more preferably 1% to 10%.

[0045] In some embodiments of the present invention, in order to apply the liquid crystal composition of the present invention to a high-transmission liquid crystal display, the liquid crystal composition further comprises at least one compound represented by general formula A-1 and / or at least one compound represented by general formula A-2, [ka] In the formula, R A1 and R A2 are each independently a linear alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, a branched alkyl group containing 3 to 12 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, [ka] and the linear alkyl group containing 1 to 12 carbon atoms, the branched alkyl group containing 3 to 12 carbon atoms, [ka] one or at least two non-adjacent -CH2- groups may each independently be substituted with -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-; one or at least two -H groups in the linear alkyl group containing 1 to 12 carbon atoms or branched alkyl group containing 3 to 12 carbon atoms may each independently be substituted with -F or -Cl; [ka] are each independently, [ka] represents [ka] one or at least two -CH2- in the ring may be replaced by -O-, and one or at least two single bonds in the ring may be replaced by a double bond; [ka] one or at least two -H in the ring may each independently be replaced by -F, -Cl, or -CN, and one or at least two -CH= in the ring may each independently be replaced by -N=; Z A11 , Z A21 and Z A22 each independently represents a single bond, -CH2CH2-, -CF2CF2-, -CO-O-, -O-CO-, -O-CO-O-, -CH=CH-, -CF=CF-, -CHO- or -OCH2-, L A11 , L A12 , L A13 , L A21 and L A22 each independently represents -H, an alkyl group containing 1 to 3 (for example, 1, 2, or 3) carbon atoms, or a halogen atom; X A1 and X A2 each independently represents a halogen atom, a halogenated alkyl group containing 1 to 5 (for example, 1, 2, 3, 4, or 5) carbon atoms, a halogenated alkoxy group containing 1 to 5 (for example, 1, 2, 3, 4, or 5) carbon atoms, a halogenated alkenyl group containing 2 to 5 (for example, 2, 3, 4, or 5) carbon atoms, or a halogenated alkenyloxy group containing 2 to 5 (for example, 2, 3, 4, or 5) carbon atoms; n A11 represents 0, 1, 2 or 3, and n A11 If represents 2 or 3, [ka] may be the same or different, and Z A11 may be the same or different, n A12 represents 1 or 2, and n A12 If represents 2, [ka] may be the same or different, n A2 represents 0, 1, 2 or 3, and n A2 If represents 2 or 3, [ka] may be the same or different, and Z A21 may be the same or different.

[0046] In some embodiments of the present invention, the compound of general formula A-1 is [ka] [ka] [ka] Any one or a combination of at least two of the compounds having the structure In the formula, R A1 is a linear alkyl group containing 1 to 8 (for example, 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms; a branched alkyl group containing 3 to 8 (for example, 3, 4, 5, 6, 7, or 8) carbon atoms; [ka] wherein one or at least two non-adjacent —CH2— groups in the linear alkyl group containing 1 to 8 carbon atoms or the branched alkyl group containing 3 to 8 carbon atoms may be each independently replaced by —CH═CH—, —C≡C—, —O—, —CO—, —CO-O— or —O-CO-; and [ka] one or at least two -H in each group may be independently replaced with -F or -Cl; R v and R w each independently represents -CH2- or -O-, v and w each independently represent 0 or 1; L A11 , L A12 , L A11 ', L A12 ′, L A14 , L A15 and L A16 each independently represents -H or -F, L A13 and L A13 ' each independently represent -H or -CH3, and X A1 represents -F, -CF3 or -OCF3.

[0047] In some embodiments of the present invention, the weight percentage of the compound of general formula A-1 in the liquid crystal composition is 0.1% to 50%, and may be, for example, 0.1%, 1%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, or 50%.

[0048] In some embodiments of the present invention, the compound of general formula A-2 is [ka] [ka] Any one or a combination of at least two of the compounds having the structure In the formula, R A2 represents a linear alkyl group containing 1 to 8 (for example, 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms or a branched alkyl group containing 3 to 8 (for example, 3, 4, 5, 6, 7, or 8) carbon atoms, wherein one or at least two non-adjacent —CH— groups in the linear alkyl group containing 1 to 8 carbon atoms or branched alkyl group containing 3 to 8 carbon atoms are each independently optionally substituted with —CH═CH—, —C≡C—, —O—, —CO—, —CO-O—, or —O-CO-, and one or at least two —H groups in the linear alkyl group containing 1 to 8 carbon atoms or branched alkyl group containing 3 to 8 carbon atoms are each independently optionally substituted with —F or —Cl, L A21 , L A22 , L A23 , L A24 and L A25 each independently represents -H or -F, X A2 represents -F, -CF3, -OCF3 or -CH2CH2CH=CF2.

[0049] In some embodiments of the present invention, the weight percentage of the compound of general formula A-2 in the liquid crystal composition may be 0.1% to 50%, for example, 0.1%, 1%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, or 50%.

[0050] In some embodiments of the present invention, in the liquid crystal composition, the total weight percentage of the compound of general formula A-1 and the compound of general formula A-2 is 0.1% to 60%, and may be, for example, 0.1%, 1%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, 50%, 52%, 54%, 56%, 58%, or 60%, etc.

[0051] In some embodiments of the present invention, the liquid crystal composition further comprises at least one polymerizable compound of the general formula RM, [ka] In the formula, R P1 represents -H, a halogen atom, -CN, -Sp2-P2, a linear alkyl group containing 1 to 12 (for example, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, a branched alkyl group containing 3 to 12 (for example, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, [ka] and the linear alkyl group containing 1 to 12 carbon atoms, the branched alkyl group containing 3 to 12 carbon atoms, [ka] wherein one or at least two non-adjacent -CH2- groups may each independently be replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-; and one or at least two -H groups may each independently be replaced by -F or -Cl; [ka] are each independently, [ka] represents [ka] one or at least two non-adjacent -CH2- groups in the ring may be replaced with -O-, and one or at least two single bonds in the ring may be replaced with a double bond; [ka] wherein one or at least two -H are each independently -F, -Cl, -CN, -Sp3-P3, a halogenated or non-halogenated straight-chain alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, a halogenated or non-halogenated straight-chain alkoxy group containing 1 to 11 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or 11) carbon atoms, [ka] and one or at least two -CH= in the ring may each independently be replaced with -N=; [ka] teeth, [ka] represents [ka] wherein one or at least two -H are each independently -F, -Cl, -CN, -Sp3-P3, a halogenated or non-halogenated straight-chain alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, a halogenated or non-halogenated straight-chain alkoxy group containing 1 to 11 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or 11) carbon atoms, [ka] one or at least two -CH= in the ring may each independently be replaced by -N=; X0 represents -O-, -S-, -CO-, -CF2-, -NH-, or -NF-; P1, P2, and P3 each independently represent a polymerizable group. Sp1, Sp2, and Sp3 each independently represent a spacer group or a single bond; Z C1 and Z C2 are each independently -O-, -S-, -CO-, -CO-O-, -O-CO-, -O-CO-O-, -CHO-, -OCHS-, -CHS-, -CFO-, -OCF-, -CFS-, -SCF-, -(CH) d -, -CF2CH2-, -CH2CF2-, -(CF2) d -, -CH=CH-, -CF=CF-, -CH=CF-, -CF=CH-, -C≡C-, -CH=CH-CO-O-, -O-CO-CH=CH-, -CH2CH2-CO-O-, -O-CO-CH2CH2-, -CHR 1 -, -CR 1 R 2 - or a single bond, R 1 and R 2 each independently represents a linear alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, or a branched alkyl group containing 3 to 12 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, and d represents an integer of 1 to 4 (e.g., it may be 1, 2, 3, or 4), a represents 0, 1 or 2, b represents 0 or 1, and when a represents 2, [ka] may be the same or different, and Z C1 may be the same or different.

[0052] Polymerizable groups according to the present invention are groups adapted for polymerization reactions (e.g. free radical or ionic polymerization, addition polymerization or condensation polymerization) or for addition or condensation in the polymer backbone. For chain polymerization, polymerizable groups containing -CH=CH- or -C≡C- are particularly preferred, and for ring-opening polymerization, for example, oxetanyl or epoxy groups are particularly preferred.

[0053] In some embodiments of the present invention, the polymerizable groups P1, P2, and P3 are each independently: [ka] or -SH, preferably [ka] or -SH, more preferably [ka] is.

[0054] The term "spacer group" is known to those skilled in the art and is described in the literature (e.g., Pure Appl. Chem. 2001, 73(5), 888 and C. Tschierske, G. Pelzl, S. Diele, Angew. Chem. 2004, 116, 6340-6368). As used herein, the term "spacer group" refers to a flexible group that connects a mesogenic group and a polymerizable group in a polymerizable compound. Typical spacer groups include, for example, -(CH)p1-, -(CHCHO)q1-CHCH2-, -(CHCHS)q1-CHCH2-, -(CHCHNH)q1-CHCH2-, -CR 0 R 00 -(CH2)p1- or -(SiR 0 R 00 -O)p1-, where p1 represents an integer of 1 to 12, q1 represents an integer of 1 to 3, and R 0 and R 00each independently represents -H, a linear or branched alkyl group containing 1 to 12 carbon atoms, or a cyclic alkyl group containing 3 to 12 carbon atoms. In the present invention, the spacer group is preferably -(CH2)p1-, -(CH2)p1-O-, -(CH2)p1-O-CO-, -(CH2)p1-CO-O-, -(CH2)p1-O-CO-O-, or -CR 0 R 00 -(CH2)p1-.

[0055] In some embodiments of the present invention, the compound of the general formula RM is [ka] [ka] [ka] [ka] Any one or a combination of at least two of the compounds having the structure In the formula, X1~X 10 and X 12 are each independently -F, -Cl, -Sp3-P3, a linear alkyl group containing 1 to 5 (for example, which may be 1, 2, 3, 4, or 5) carbon atoms, an alkoxy group containing 1 to 5 (for example, which may be 1, 2, 3, 4, or 5) carbon atoms, [ka] Represents.

[0056] In some embodiments of the present invention, the weight percentage of the polymerizable compound of general formula RM in the liquid crystal composition is 0.001% to 5%, for example, 0.001%, 0.002%, 0.004%, 0.005%, 0.006%, 0.008%, 0.01%, 0.02%, 0.04%, 0.06%, 0.08%, 0.1%, 0.2%, 0.25%, 0.26%, 0.27%, 0.28%, 0.29%, 0.3%, 0.32%, 0.33%, 0.34%, 0.35%, 0.4%, 0.5%, 0.6%, 0.8%, 1%, 1.2%, 1.6%, 1.8%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, or 5%.

[0057] In some embodiments of the present invention, the liquid crystal composition further comprises at least one additive.

[0058] The additives include nematic liquid crystals, smectic liquid crystals, cholesteric liquid crystals, dopants, antioxidants, ultraviolet absorbers, infrared absorbers, polymerizable monomers, and light stabilizers.

[0059] In some embodiments of the present invention, the dopant is [ka] [ka] The compound may comprise any one or a combination of at least two of the following compounds:

[0060] In some embodiments of the present invention, the weight percentage of the dopant in the liquid crystal composition is 0% to 5%, and may be, for example, 0%, 0.01%, 0.05%, 0.1%, 0.2%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, or 5%, and more preferably 0.01% to 1%.

[0061] In some embodiments of the present invention, the additives such as antioxidants, light stabilizers, UV absorbers, etc. are preferably [ka] [ka] [ka] It is a compound called In the formula, n represents a positive integer of 1 to 12, and may be, for example, 1, 2, 4, 6, 8, 9, 10, 11, or 12.

[0062] In some embodiments of the present invention, the antioxidant is [ka] The compound is any one or a combination of at least two selected from the following compounds:

[0063] In some embodiments of the present invention, the weight percentage of the light stabilizer in the liquid crystal composition is 0% to 5%, and may be, for example, 0%, 0.01%, 0.05%, 0.1%, 0.2%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, or 5%, and more preferably 0.01% to 1%.

[0064] For ease of calculation, in the present invention, the total weight percentage of compounds having different general formulas in the liquid crystal composition is a percentage, and the content of the additive is not included in the total content of the liquid crystal composition; that is, the addition of the additive makes the total content of each component in the liquid crystal composition > 100%.

[0065] In some embodiments of the present invention, the liquid crystal composition further comprises a polymerization initiator, and examples of the polymerization initiator include, but are not limited to, benzoin ethers, benzophenones, acetophenones, benzil ketals, acylphosphine oxides, and the like.

[0066] In a second aspect, the present invention provides a liquid crystal display device, the liquid crystal display device comprising the liquid crystal composition according to the first aspect. [Effects of the Invention]

[0067] Compared with the prior art, the present invention has the following beneficial effects:

[0068] In the present invention, by designing the specific composition of the liquid crystal composition, and further by using a compound of general formula I containing a cycloalkenyl group in combination with a compound of general formula II and a compound of general formula III, the liquid crystal composition prepared has suitable optical anisotropy, suitable clearing point, suitable absolute value of dielectric anisotropy, large K value, small rotational viscosity, short response time, high transmittance, high contrast and long low-temperature storage time. As a result, the liquid crystal display device comprising the liquid crystal composition of the present invention has a wide temperature operating range, low threshold voltage, good contrast, fast response speed, fast refresh speed and high transmittance, and is applicable to display modes such as VA, IPS and NFFS, which have fast response and high contrast. DETAILED DESCRIPTION OF THE INVENTION

[0069] In order to facilitate understanding of the present invention, examples of the present invention are listed below. Those skilled in the art should understand that the examples are only for understanding the present invention and should not be considered as specifically limiting the present invention.

[0070] For ease of explanation, in the following examples, the group structures of the liquid crystal compositions are represented by the codes shown in Table 1. [Table 1(1)] [Table 1(2)] In Table 1, the dashed lines represent the access sites of the groups.

[0071] Take the following structural formula as an example: [ka] When the structural formula is represented by the code shown in Table 1, it can be represented as nCCGF, where n in the code represents the number of C atoms in the alkyl group at the left end. For example, when n is "3", this represents that the alkyl group is -C3H7, and C in the code represents a cyclohexanyl group, G represents a 2-fluoro-1,4-phenylene group, and F represents fluorine.

[0072] In the following Examples and Comparative Examples, the abbreviations for the performance measurement items are as shown in Table 2. [Table 2] The formula is obtained by measuring at 20°C using an Abbe refractometer under a sodium lamp (589 nm) light source. Cp (°C): Measured using a quantitative method using a melting point measuring apparatus. 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, and the measurement conditions are 20°C, 1 kHz, and a VA-type measurement cell with a cell thickness of 6 μm. K 11 , K. 33 :K 11 and K. 33 was calculated by measuring the capacitance-voltage characteristic curve (CV curve) of the liquid crystal material using an LCR meter and a VA measurement cell, and the measurement conditions were a 6 μm VA measurement cell, V=0.1 to 20V. γ1: Obtained by measurement using an LCM-2 type liquid crystal property evaluation system. Measurement conditions: 20° C., 160 to 240 V, and a measurement cell thickness of 20 μm. τ: Obtained by measurement at 25°C using a DMS505 measurement device, measurement conditions: 20°C, V100 drive, negative IPS type measurement cell with a cell thickness of 3.5 μm. T r The VT curve of the dimming device was measured using a DMS 505 photoelectric integrated measuring instrument, and the maximum transmittance value in the VT curve was taken as the transmittance of the liquid crystal. The measurement cell was a negative IPS type, and the cell thickness was 3.5 μm. Using a CR:DMS 505 measuring device, the transmittance of the liquid crystal cell was measured at 255 grayscale voltage and 0 grayscale voltage, respectively, i.e., T r255 and T r0 Measure T r255 / T r0 The measurement conditions were 20°C and a negative IPS type measurement cell with a cell thickness of 3.5 μm. LTS: A liquid crystal medium in a nematic phase is placed in a 6 μm VA measurement cell and stored at a low temperature of −40° C., and the time when crystal precipitation is observed is recorded. [Comparative Example 1]

[0073] In this comparative example, a liquid crystal composition is provided, which contains components in the weight percentages shown in the table below, and is filled between two substrates of a liquid crystal display to measure its performance. [Table 3] Comparative Example 2

[0074] In this comparative example, a liquid crystal composition is provided, which contains components in the weight percentages shown in the table below, and is filled between two substrates of a liquid crystal display to measure its performance. [Table 4] Comparative Example 3

[0075] In this comparative example, a liquid crystal composition is provided, which contains components in the weight percentages shown in the table below, and is filled between two substrates of a liquid crystal display to measure its performance. [Table 5] [Example]

[0076] In this example, a liquid crystal composition is provided, which contains components in the weight percentages shown in the table below, and is filled between two substrates of a liquid crystal display to measure its performance. [Table 6]

[0077] As can be seen from the comparison between Comparative Examples 1 to 3 and Example 1, the liquid crystal composition of the present invention has good optical anisotropy, a high clearing point, an appropriate absolute value of dielectric anisotropy, a large K value (K 11 , K. 33 ), have suitable rotational viscosity, short response time, high transmittance, good contrast, and equivalent or even better low-temperature storage stability. [Example]

[0078] In this example, a liquid crystal composition is provided, which contains components in the weight percentages shown in the table below, and is filled between two substrates of a liquid crystal display to measure its performance. [Table 7] [Example]

[0079] In this example, a liquid crystal composition is provided, which contains components in the weight percentages shown in the table below, and is filled between two substrates of a liquid crystal display to measure its performance. [Table 8] [Example]

[0080] In this example, a liquid crystal composition is provided, which contains components in the weight percentages shown in the table below, and is filled between two substrates of a liquid crystal display to measure its performance. [Table 9] [Example]

[0081] In this example, a liquid crystal composition is provided, which contains components in the weight percentages shown in the table below, and is filled between two substrates of a liquid crystal display to measure its performance. [Table 10] [Example]

[0082] In this example, a liquid crystal composition is provided, which contains components in the weight percentages shown in the table below, and is filled between two substrates of a liquid crystal display to measure its performance. [Table 11] [Example]

[0083] In this example, a liquid crystal composition is provided, which contains components in the weight percentages shown in the table below, and is filled between two substrates of a liquid crystal display to measure its performance. [Table 12] [Example]

[0084] In this example, a liquid crystal composition is provided, which contains components in the weight percentages shown in the table below, and is filled between two substrates of a liquid crystal display to measure its performance. [Table 13] [Example]

[0085] In this example, a liquid crystal composition is provided, which contains components in the weight percentages shown in the table below, and is filled between two substrates of a liquid crystal display to measure its performance. [Table 14] [Example]

[0086] In this example, a liquid crystal composition is provided, which contains components in the weight percentages shown in the table below, and is filled between two substrates of a liquid crystal display to measure its performance. [Table 15] [Example]

[0087] In this example, a liquid crystal composition is provided, which contains components in the weight percentages shown in the table below, and is filled between two substrates of a liquid crystal display to measure its performance. [Table 16] [Example]

[0088] In this example, a liquid crystal composition is provided, which contains components in the weight percentages shown in the table below, and is filled between two substrates of a liquid crystal display to measure its performance. [Table 17]

[0089] As described above, the liquid crystal composition provided by the present invention has good optical anisotropy, a good clearing point, an appropriate absolute value of dielectric anisotropy, and a large K value (K 11 , K. 33 ), small rotational viscosity, short response time, high transmittance, high contrast and long low-temperature storage time, and the liquid crystal display device including the liquid crystal composition of the present invention has a wide temperature range, low threshold voltage, good contrast, fast response speed, fast refresh rate and high transmittance, and is particularly suitable for display modes such as VA, IPS and NFFS.

[0090] The applicant claims that the present invention has described the liquid crystal composition and liquid crystal display device of the present invention through the above examples, but the present invention is not limited to the above examples, i.e., it does not mean that the present invention cannot be implemented without relying on the above examples. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of each raw material of the product of the present invention, addition of auxiliary components, selection of specific methods, etc. are all within the protection scope and disclosure scope of the present invention. [Industrial Applicability]

[0091] The liquid crystal composition according to the present invention can be applied to the field of liquid crystals.

Claims

1. at least one compound of general formula I, at least one compound of general formula II, and at least one compound of general formula III, 【Chemistry 1】 In the formula, R １ represents -H, a halogenated or non-halogenated straight-chain alkyl group containing 1 to 12 carbon atoms, a halogenated or non-halogenated branched-chain alkyl group containing 3 to 12 carbon atoms, a halogenated or non-halogenated alkoxy group containing 1 to 12 carbon atoms, a halogenated or non-halogenated alkenyl group containing 2 to 12 carbon atoms, a halogenated or non-halogenated alkenyloxy group containing 2 to 12 carbon atoms, 【Chemistry 2】 represents R ２ ~R ５ each independently represents a linear alkyl group containing 1 to 12 carbon atoms, a branched alkyl group containing 3 to 12 carbon atoms, an alkoxy group containing 1 to 12 carbon atoms, an alkenyl group containing 2 to 12 carbon atoms, an alkenyloxy group having 2 to 12 carbon atoms, 【Transformation 3】 represents 【Chemistry 4】 teeth, 【Transformation 5】 represents 【Transformation 6】 teeth, 【Transformation 7】 represents 【Transformation 8】 One or at least two -CH ２ - may be replaced by -O-, and one or at least two single bonds in the ring may be replaced by a double bond; 【Chemistry 9】 In the formula (I), one or at least two —H are each independently —F, —Cl, —CN, or —CH ３ or -OCH ３ and one or at least two -CH= in the ring may be replaced by -N=; 【Chemistry 10】 teeth, 【Chemistry 11】 represents 【Chemistry 12】 One or at least two -CH ２ - may be replaced by -O-, one or at least two single bonds in the ring may be replaced by a double bond, and at least one 【Chemistry 13】 wherein one or at least two single bonds may be replaced by a double bond; 【Chemistry 14】 are each independently, 【Chemistry 15】 represents 【Chemistry 16】 In the formula (I), one or at least two —H are each independently —F, —Cl, —CN, or —CH ３ or -OCH ３ and one or at least two -CH= in the ring may be replaced by -N=; L １ ~L ６ each independently represents a halogen atom, X １ and X ２ each independently represents —O— or —S—, Z １ represents a single bond, —CO—O—, —O—CO—, —CH ２ O-, -OCH ２ -, -CH=CH-, -C≡C-, -CH ２ CH ２ -, -CF ２ CF ２ -, -(CH ２ ) ４ -, -CF ２ O- or -OCF ２ represents -, n １ represents 0, 1 or 2, n １ If represents 2, 【Chemistry 17】 may be the same or different, Z １ may be the same or different, n ２ represents 1 or 2, n ２ If represents 2, [Chemistry 18] may be the same or different, and n ３ represents 0, 1, 2 or 3; n ４ represents 0 or 1, and 2≦n ３ +n ４ ≦3, and n ３ When represents 2 or 3, 【Chemistry 19】 may be the same or different.

2. The compound of general formula I is 【Chemistry 20】 any one or a combination of at least two of the compounds having the structure wherein 【Chemistry 21】 R １ , X １ , X ２ , L １ , L ２ and Z １ has the same scope of protection as claim 1, Preferably, the 【Chemistry 22】 teeth, 【Chemistry 23】 represents Preferably, the L １ , L ２ represents a fluorine atom, Preferably, the compound of general formula I is compound I-1, Preferably, the liquid crystal composition comprises at least two compounds of the general formula II, The liquid crystal composition according to claim 1, characterized in that the weight percentage of the compound of general formula I in the liquid crystal composition is preferably 0.1% to 30%, more preferably 1% to 20%, and even more preferably 4% to 16%.

3. The compound of general formula II is 【Chemistry 24】 any one or a combination of at least two compounds having the structure In the formula, R ２ , R ３ , L ３ and L ４ has the same scope of protection as claim 1, Preferably, the L ３ , L ４ represent a fluorine atom, Preferably, the liquid crystal composition comprises at least two compounds of the general formula II, The liquid crystal composition according to claim 1 or 2, characterized in that the weight percentage of the compound of general formula II in the liquid crystal composition is preferably 0.1% to 50%, more preferably 15% to 36%.

4. The compound of general formula III is 【Chemistry 25(1)】 【Chemistry 25(2)】 【Chemistry 25(3)】 any one or a combination of at least two compounds having the structure In the formula, R ４ , R ５ , L ５ and L ６ has the same scope of protection as claim 1, Preferably, the L ５ , L ６ represent a fluorine atom, Preferably, the liquid crystal composition comprises at least two compounds of the general formula III, The liquid crystal composition according to any one of claims 1 to 3, characterized in that the weight percentage of the compound of general formula III in the liquid crystal composition is preferably 0.1% to 30%, more preferably 3% to 15%.

5. The liquid crystal composition further comprises at least one compound of general formula N, 【Chemistry 26】 In the formula, R Ｎ１ and R Ｎ２ are each independently a straight-chain alkyl group containing 1 to 12 carbon atoms, a branched-chain alkyl group containing 3 to 12 carbon atoms, 【Chemistry 27】 and one or at least two non-adjacent —CH ２ - may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-; 【Chemistry 28】 are each independently, 【Chemistry 29】 represents 【Transformation 30】 One or at least two -CH ２ - may be replaced by -O-, 【Chemistry 31】 one or at least two -H in the ring may each independently be replaced by -F, -Cl, or -CN, and one or at least two -CH= in the ring may each independently be replaced by -N=; Z Ｎ１ and Z Ｎ２ each independently represents a single bond, —CO—O—, —O—CO—, or —CH ２ O-, -OCH ２ -, -CH=CH-, -C≡C-, -CH ２ CH ２ -, -CF ２ CF ２ -, -(CH ２ ) ４ -, -CF ２ O- or -OCF ２ represents -, L Ｎ１ and L Ｎ２ each independently represents —H, an alkyl group containing 1 to 3 carbon atoms, or a halogen atom; n Ｎ１ represents 0, 1, 2 or 3; n Ｎ２ represents 0 or 1, and 0≦n Ｎ１ +n Ｎ２ ≦3, and n Ｎ１ When represents 2 or 3, the ring 【Chemistry 32】 may be the same or different, Z Ｎ１ may be the same or different, and The liquid crystal composition according to any one of claims 1 to 4, wherein the compound of general formula N does not contain a substituted or unsubstituted triphenyl group structure, and the substituted substituent is selected from -F, -Cl, or -CN.

6. The compound of general formula N is 【Chemistry 33(1)】 【Chemistry 33(2)】 any one or a combination of at least two compounds having the structure In the formula, R Ｎ１ and R Ｎ２ has the same scope of protection as claim 5, Preferably, the compound of general formula N is 【Transformation 34】 any one or a combination of at least two compounds having the structure The liquid crystal composition according to claim 5, wherein the weight percentage of the compound of general formula N in the liquid crystal composition is preferably 0.1% to 30%, more preferably 5% to 25%.

7. The liquid crystal composition further comprises at least one compound of general formula M, 【Chemistry 35】 In the formula, R Ｍ１ and R Ｍ２ are each independently a straight-chain alkyl group containing 1 to 12 carbon atoms, a branched-chain alkyl group containing 3 to 12 carbon atoms, 【Transformation 36】 and one or at least two non-adjacent —CH ２ - may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-; 【Chemistry 37】 are each independently, 【Transformation 38】 represents 【Chemistry 39】 One or at least two -CH ２ - may be replaced by -O-, and one or at least two single bonds in the ring may be replaced by a double bond; 【Chemistry 40】 wherein at most one —H may be replaced by a halogen atom; Z Ｍ１ and Z Ｍ２ each independently represents a single bond, —CO—O—, —O—CO—, or —CH ２ O-, -OCH ２ -, -C≡C-, -CH=CH-, -CH ２ CH ２ - or - (CH ２ ) ４ represents - and n Ｍ represents 0, 1 or 2, n Ｍ If represents 2, 【Chemistry 41】 may be the same or different, Z Ｍ２ may be the same or different, Preferably, the compound of general formula M is 【Chemistry 42(1)】 【Chemistry 42(2)】 any one or a combination of at least two of the compounds having the structure In the formula, R Ｍ１ and R Ｍ２ has the same scope of protection as above, Preferably, the compound of general formula M is 【Chemistry 43】 any one or a combination of at least two of the compounds having the structure The liquid crystal composition according to any one of claims 1 to 6, characterized in that, in the liquid crystal composition, the weight percentage of the compound of general formula M is preferably 0.1% to 60%, more preferably 30% to 50%.

8. The liquid crystal composition further comprises at least one compound of general formula B, 【Chemistry 44】 In the formula, R Ｂ１ and R Ｂ２ each independently represents a halogen atom, a halogenated or non-halogenated straight-chain alkyl group containing 1 to 12 carbon atoms, a halogenated or non-halogenated branched-chain alkyl group containing 3 to 12 carbon atoms, 【Chemistry 45】 wherein the halogenated or non-halogenated linear alkyl group containing 1 to 12 carbon atoms, the halogenated or non-halogenated branched alkyl group containing 3 to 12 carbon atoms, 【Chemistry 46】 one or more non-adjacent —CH ２ - may be independently replaced by -CH=CH-, -C≡C-, -CH=CF-, -O-, -CO-, -CO-O- or -O-CO-; 【Chemistry 47】 are each independently, 【Chemistry 48】 represents 【Chemistry 49】 one or at least two non-adjacent —CH ２ - may be replaced by -O-, and one or at least two single bonds in the ring may be replaced by a double bond; [Transformation 50] one or at least two -H in the ring may each independently be replaced by -CN, -F or -Cl, and one or at least two -CH= in the ring may each independently be replaced by -N=; X Ｂ represents —O—, —S—, or —CO—; L Ｂ１ and L Ｂ２ are each independently —H, —F, —Cl, or —CF ３ or -OCF ３ represents Z Ｂ１ and Z Ｂ２ each independently represents a single bond, —CO—O—, —O—CO—, or —CH ２ O-, -OCH ２ -, -CH=CH-, -C≡C-, -CH ２ CH ２ -, -CF ２ CF ２ -, -(CH ２ ) n Ｂ４ -, -(CH ２ ) n Ｂ４ O-, -(CH ２ ) n Ｂ４ S-, -CF ２ O- or -OCF ２ represents -, n Ｂ４ represents an integer from 0 to 5, n Ｂ１ and n Ｂ２ each independently represents 0, 1 or 2; n Ｂ１ If represents 2, 【Chemistry 51】 may be the same or different, and n Ｂ２ If represents 2, 【Chemistry 52】 may be the same or different, Z Ｂ２ The liquid crystal composition according to any one of claims 1 to 7, wherein may be the same or different.

9. The compound of the general formula B is 【Chemistry 53】 any one or a combination of at least two of the compounds having the structure In the formula, R Ｂ１ ' represents an alkyl group containing 1 to 8 carbon atoms, an alkoxy group containing 1 to 8 carbon atoms, or an alkenyl group containing 2 to 8 carbon atoms; X Ｂ１ is —O— or —CH ２ represents -, The R Ｂ２ , X Ｂ and Z Ｂ１ has the same scope of protection as claim 8, Preferably, the compound of general formula B-1 is 【Chemistry 54】 any one or a combination of at least two of the compounds having the structure In the formula, R Ｂ２ ' represents an alkyl group containing 1 to 8 carbon atoms; The R Ｂ１ ', X Ｂ and n Ｂ４ has the same scope of protection as above, n Ｂ３ represents 1, 2, 3 or 4, n Ｂ５ represents 0, 1, 2, 3 or 4, The liquid crystal composition according to claim 8, wherein the weight percentage of the compound of general formula B in the liquid crystal composition is preferably 0.1% to 20%, more preferably 1% to 10%.

10. A liquid crystal display device comprising the liquid crystal composition according to any one of claims 1 to 9.

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