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 shown as a formula I and at least one compound shown as a formula II. Through the design and mutual compounding of liquid crystal components, the liquid crystal composition has a proper clearing point, optical anisotropy and dielectric anisotropy absolute value; the liquid crystal material has the advantages of higher elastic constant, lower rotary viscosity, lower ratio of the rotary viscosity to the elastic constant, higher penetration rate, higher response speed, better low-temperature storage stability, wider nematic phase temperature range and higher contrast ratio, the use effect of the liquid crystal material is favorably improved, and the application range of the liquid crystal material is widened. The method is suitable for fast-response VA, PSVA, IPS, NFFS and other display modes.

Description

Technical Field

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

[0002] Liquid Crystal Display (LCD) has developed rapidly due to its small size, light weight, low power consumption and excellent display quality, and has been widely used in portable electronic information products. With the increase in the size of LCD screens for portable computer applications, office applications, and video applications, LCDs can be used for large-screen displays and eventually replaced cathode ray tube displays (CRT).

[0003] Compared with traditional display devices and display materials, liquid crystal display materials have obvious advantages: low driving voltage, low power consumption, high reliability, large amount of displayed information, color display, no flicker, no harm to the human body, 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 display and imaging field, and promoted the development of microelectronics technology and optoelectronic information technology. Liquid crystal materials have been widely used in many display occasions due to their good optical properties and photoelectric effects.

[0004] In recent years, researchers have developed different liquid crystal display modes. Among them, the most important liquid crystal display modes include TN (twisted nematic) mode, STN (super twisted nematic) mode, IPS (in-plane switching) mode, OCB (optically controlled birefringence) mode and VA (vertical alignment) mode. All modes use electric fields, among which the electric fields of TN (twisted nematic), STN (super twisted nematic), OCB (optically controlled birefringence) and VA (vertical alignment) modes are basically perpendicular to the substrate, or perpendicular to the liquid crystal layer. In addition to these modes, there are also electro-optical modes that use electric fields that are basically parallel to the substrate or the liquid crystal layer, such as IPS (in-plane switching) mode.

[0005] The VA (vertical alignment) mode uses a liquid crystal molecule arranged vertically to the substrate, and uses a liquid crystal medium with negative dielectric anisotropy, which has a very good dark state and high contrast. However, there are still some problems to be solved, such as the absolute value of the negative dielectric anisotropy of the liquid crystal medium is not large enough, resulting in a driving voltage that is not low enough, the viscosity of the liquid crystal medium is not low enough, and it is impossible to cope with the demand for rapid response, the low-temperature storage stability of the liquid crystal is insufficient, and there is also a large room for improvement in contrast and elastic constants. Therefore, the development of liquid crystal materials with excellent dielectric anisotropy, low viscosity, better low-temperature storage, elastic constants, response speed and contrast is a problem to be solved in this field. Summary of the invention

[0006] In view of the deficiencies in the prior art, the object of the present invention is to provide a liquid crystal composition and a liquid crystal display device comprising the same, wherein the liquid crystal composition has lower viscosity, larger elastic constant, faster response speed, higher transmittance, better low-temperature storage stability, wider nematic phase temperature range and better contrast while maintaining appropriate clearing point, optical anisotropy and absolute value of dielectric anisotropy.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] In a first aspect, the present invention provides a liquid crystal composition, comprising:

[0009] At least one compound of formula I:

[0010] as well as

[0011] At least one compound of formula II:

[0012]

[0013] Among them, R 1 represents a straight-chain or branched alkenyl group containing 2 to 12 (e.g. 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms;

[0014] R 2 represents a straight or branched alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms, One or at least two non-adjacent -CH 2 - may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-;

[0015] R 3 and R 4 Each independently represents -H, halogen, a straight or branched chain alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms, The straight or branched alkyl group containing 1 to 12 carbon atoms, One or at least two non-adjacent -CH 2- may be independently replaced by -CH=CH-, -C≡C-, -O-, -S-, -CO-, -CO-O- or -O-CO-, and one or at least two -H in the aforementioned groups may be independently replaced by -F or -Cl;

[0016] ring and ring Each independently expresses Said One or at least two of the 2 - may be replaced by -O-, and the single bonds in one or at most two rings may be replaced by double bonds; One or at least two of the -H in the 3 or -OCH 3 Substitution, -CH= in one or at least two rings may be replaced by -N=;

[0017] L 1 , L 2 and L 3 Each independently represents -F or -CH 3 ;

[0018] G represents -O-, -S-, -CO-, -CF 2 -, -NH- or -NF-;

[0019] X 1 and X 2 Each independently represents -H, halogen, a halogenated or unhalogenated alkyl group containing 1 to 3 (e.g., 1, 2 or 3) carbon atoms, or a halogenated or unhalogenated alkoxy group containing 1 to 3 (e.g., 1, 2 or 3) carbon atoms;

[0020] Z 1 and Z 2 Each independently represents a single bond, -O-, -S-, -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 -;

[0021] Z 3 Indicates a single bond, -O(CH 2 ) a -or-S(CH2 ) a -; a represents an integer from 0 to 3, for example, it can be 0, 1, 2 or 3;

[0022] n 1 and n 2 Each independently represents 0, 1 or 2; when n 1 =2, ring Same or different, Z 1 Same or different; when n 2 =2, ring Same or different, Z 2 Same or different.

[0023] The present invention provides a liquid crystal composition with negative dielectric anisotropy, which comprises a combination of a compound of formula I with an alkenyl terminal group and a compound of formula II containing a dibenzo pentacyclic structure. Through the design and mutual compounding of liquid crystal components, the liquid crystal composition has a high elastic constant (K) under the condition of having appropriate clearing point, optical anisotropy and absolute value of dielectric anisotropy. 11 and K 33 ), smaller rotational viscosity γ 1 , smaller ratio of rotational viscosity to elastic constant (γ 1 / K 33 ), higher transmittance, faster response speed and better low-temperature storage stability, wider nematic phase temperature range and better contrast, which help to improve the overall performance of liquid crystal materials and are suitable for VA, PSVA, IPS, NFFS and other display modes.

[0024] In the present invention, the 2-12 carbon atoms can be 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12 carbon atoms.

[0025] The alkenyl group in the present invention is preferably a group represented by any one of formula (V1) to formula (V9), and is particularly preferably formula (V1), formula (V2), formula (V8) or (V9). The groups represented by formula (V1) to formula (V9) are as follows:

[0026] Here, * represents the carbon atom in the ring structure to which it is bonded.

[0027] The alkenyloxy group in the present invention is preferably a group represented by any one of formula (OV1) to formula (OV9), and is particularly preferably a group represented by formula (OV1), formula (OV2), formula (OV8) or (OV9). The groups represented by formula (OV1) to formula (OV9) are as follows:

[0028] Here, * represents the carbon atom in the ring structure to which it is bonded.

[0029] In the present invention, the 1-12 carbon atoms can be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12 carbon atoms.

[0030] When n 1 =2, there are two These two They may have the same structure or different structures. For example, one may be Another one is When the present invention refers to the expression "same or different", they all have the same meaning.

[0031] In the present invention, “may be independently replaced by…” means that it may be replaced or not replaced, that is, replacement or not replacement falls within the protection scope of the present invention, and the same applies to “may be independently replaced by…”, and the positions of “replacement” and “replacement” can be arbitrary.

[0032] In the present invention, the short straight lines on one or both sides of the group structure represent access bonds, not methyl groups, e.g. The short straight line on the left, Short straight lines on both sides.

[0033] In the present invention, the halogen includes fluorine, chlorine, bromine or iodine, etc.; when the same description is mentioned below, they have the same meaning.

[0034] In some embodiments of the present invention, the L 1 , L 2 and L 3 Indicates -F.

[0035] In some embodiments of the present invention, the compound of formula I is selected from the group consisting of:

[0036] as well as

[0037]

[0038] Among them, the R 1 and R 2 has the same definition as in Formula I.

[0039] In some embodiments of the present invention, the R 1 It represents a straight-chain alkenyl group having 2 to 8 carbon atoms, and is more preferably a group represented by any one of formula (V1) to formula (V9).

[0040] In some embodiments of the present invention, the R1 express * indicates the carbon atom in the ring structure to which it is bonded.

[0041] In some embodiments of the present invention, the R 2 It represents a straight-chain alkyl group containing 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms, a straight-chain alkoxy group containing 1-6 (e.g., 1, 2, 3, 4, 5 or 6) carbon atoms, or a straight-chain alkenyl group containing 2-6 (e.g., 2, 3, 4, 5 or 6) carbon atoms, and a straight-chain alkoxy group containing 1-6 carbon atoms is further preferred.

[0042] In some embodiments of the present invention, said G represents -O- or -S-.

[0043] In some embodiments of the present invention, the X 1 and X 2 Indicates -F.

[0044] In some embodiments of the present invention, the compound of formula II is selected from the group consisting of:

[0045]

[0046]

[0047] as well as

[0048]

[0049] Among them, the R 3 , R 4 , Z 1 and Z 3 Having the same definition as in Formula II;

[0050] Y 1 , Y 2 Each independently represents -O- or -CH 2 -.

[0051] In some embodiments of the present invention, the compound of formula II is selected from the group consisting of:

[0052] as well as

[0053]

[0054] In some embodiments of the present invention, the R 3It 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 6 (e.g., 1, 2, 3, 4, 5 or 6) carbon atoms, and more preferably a straight-chain alkoxy group having 1 to 6 carbon atoms.

[0055] In some embodiments of the present invention, the Z 3 Represents a single bond, -O- or -OCH 2 -.

[0056] In some embodiments of the present invention, the R 4 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 alkenyl group having 2 to 6 (e.g. 2, 3, 4, 5 or 6) carbon atoms, a straight-chain alkoxy group having 1 to 6 (e.g. 1, 2, 3, 4, 5 or 6) carbon atoms, a straight-chain alkenyloxy group having 2 to 6 (e.g. 2, 3, 4, 5 or 6) carbon atoms, One or at least two -H groups in the aforementioned groups may be independently substituted by -F or -Cl.

[0057] In some embodiments of the present invention, the R 4 represents a straight-chain alkyl group containing 1 to 8 carbon atoms, a straight-chain alkoxy group containing 1 to 6 carbon atoms,

[0058] In some embodiments of the present invention, the compound of formula II is selected from the group consisting of:

[0059]

[0060] as well as

[0061]

[0062] Among them, R 3 represents a straight-chain alkyl group containing 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms or a straight-chain alkoxy group containing 1 to 6 (e.g., 1, 2, 3, 4, 5 or 6) carbon atoms, and more preferably a straight-chain alkoxy group containing 1 to 6 carbon atoms;

[0063] R 4 ' represents a straight chain alkyl group containing 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms;

[0064] ring express

[0065] In some embodiments of the present invention, the mass percentage of the compound of formula I in the liquid crystal composition is 1%-30%, for example, it can be 3%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 25% or 28%, etc., and more preferably 2%-25%.

[0066] In some embodiments of the present invention, the mass percentage of the compound of formula II in the liquid crystal composition is 1%-30%, for example, it can be 2%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 25% or 28%, etc., and more preferably 3%-20%.

[0067] In some embodiments of the present invention, the liquid crystal composition further comprises at least one compound of formula M:

[0068]

[0069] Among them, R M1 and R M2 each independently represents a straight or branched alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms, 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-;

[0070] ring ring and ring Each independently expresses Said One or at least two of the 2 - can be replaced by -O-, At most one -H in may be replaced by halogen;

[0071] Z M1 and Z M2 Each independently represents a single bond, -CO-O-, -O-CO-, -CH 2 O-、-OCH 2 -、-CH=CH-、-CH 2 CH 2 -or-(CH 2 ) 4 -;

[0072] n M1 represents 0, 1, 2, or 3, where n M1 =2 or 3, the ring Same or different, Z M2 Same or different.

[0073] In some embodiments of the present invention, the compound of formula M is selected from the group consisting of:

[0074]

[0075]

[0076]

[0077]

[0078]

[0079] as well as

[0080]

[0081] Among them, R M1 and R M2 Each independently represents a straight-chain or branched alkyl group containing 1 to 10 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10) carbon atoms, wherein one or two or more non-adjacent -CH 2 - may be replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-, respectively and independently.

[0082] In some embodiments of the present invention, the R M1 and R M2 Each independently represents a straight-chain alkyl group having 1 to 10 (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10) carbon atoms, a straight-chain alkoxy group having 1 to 9 (e.g. 1, 2, 3, 4, 5, 6, 7, 8 or 9) carbon atoms or a straight-chain alkenyl group having 2 to 9 (e.g. 2, 3, 4, 5, 6, 7, 8 or 9) carbon atoms.

[0083] In some embodiments of the present invention, the compound of formula M comprises at least one (for example, 1, 2, 3 or 4, etc.) selected from the group consisting of a compound of formula M-1, a compound of formula M-5, a compound of formula M-14, a compound of formula M-22, a compound of formula M-29, a compound of formula M-30, a compound of formula M-37, a compound of formula M-39, a compound of formula M-42, a compound of formula M-45, a compound of formula M-47, a compound of formula M-48, a compound of formula M-49, a compound of formula M-50, a compound of formula M-51, a compound of formula M-57, and a compound of formula M-58.

[0084] In some embodiments of the present invention, the compound of formula M comprises at least one (for example, 1, 2, 3 or 4, etc.) selected from the group consisting of compounds of formula M-1, compounds of formula M-5, compounds of formula M-14, compounds of formula M-22, compounds of formula M-30, compounds of formula M-45, and compounds of formula M-47.

[0085] In a preferred embodiment of the present invention, in order to further reduce the viscosity of the liquid crystal composition, the liquid crystal composition preferably comprises at least one (e.g., 1, 2, or 3, etc.) R M1 and / or R M2 A compound of formula M-1, a compound of formula M-14, a compound of formula M-22, or a compound of formula M-30 that is a straight-chain alkenyl group containing 2 to 6 (eg, 2, 3, 4, 5, or 6) carbon atoms.

[0086] In some embodiments of the present invention, the mass percentage of the compound of formula M in the liquid crystal composition is 1%-80%, for example, it can be 2%, 5%, 8%, 10%, 12%, 15%, 20%, 25%, 30%, 35%, 38%, 40%, 45%, 50%, 55%, 60%, 65%, 70% or 75%, etc., and more preferably 30%-75%.

[0087] In some embodiments of the present invention, the mass percentage of at least one (for example, 1, 2 or 3, etc.) compound of formula M selected from the group consisting of compounds of formula M-1, compounds of formula M-5, compounds of formula M-14, compounds of formula M-22, compounds of formula M-30, compounds of formula M-45, and compounds of formula M-47 is 1%-75%, for example, it can be 2%, 5%, 8%, 10%, 12%, 15%, 20%, 25%, 30%, 35%, 38%, 40%, 45%, 50%, 55%, 60%, 65%, 70% or 75%, etc.

[0088] In some embodiments of the present invention, the liquid crystal composition further comprises at least one N-type compound, wherein the N-type compound is selected from the group consisting of a compound of formula N1, a compound of formula N2, and a compound of formula N3:

[0089]

[0090] Among them, R N11 , R N12 , R N21 , R N22 , R N31 and R N32 each independently represents a straight or branched alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms, 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-;

[0091] ring ring and ring Each independently expresses in One or at least two of the 2 - may be replaced by -O-, and one or at most two single bonds in the ring may be replaced by double bonds, wherein One or at least two -H in the ring may be independently replaced by -F, -Cl or -CN, and -CH= in one or at least two rings may be replaced by -N=;

[0092] ring express in One or at least two of the 2 - may be replaced by -O-, and one or at most two single bonds in the ring may be replaced by double bonds, wherein -CH= in one or at least two rings may be replaced by -N=;

[0093] Z N1 Represents -CO-O-, -O-CO-, -CH 2 O-、-OCH 2 -、-CH=CH-、-C≡C-、-CH 2 CH 2 -、-CF 2 CF 2 -、-(CH 2 ) 4 -、-CF2 O- or -OCF 2 -;

[0094] Z N2 and Z N3 Each independently 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 -;

[0095] L N11 , L N12 , L N21 , L N22 , L N31 and L N32 Each independently represents -H, halogen, a straight-chain or branched alkyl group containing 1 to 3 (e.g., 1, 2 or 3) carbon atoms, or a straight-chain or branched alkoxy group containing 1 to 3 (e.g., 1, 2 or 3) carbon atoms;

[0096] n N1 Indicates 0 or 1;

[0097] n N2 Indicates 1, 2, or 3, n N3 Represents 0 or 1, and 2≤n N2 +n N3 ≤3, when n N2 When it means 2 or 3, the ring Same or different, Z N2 Same or different.

[0098] In some embodiments of the present invention, the compound of formula N1 is selected from the group consisting of the following compounds:

[0099]

[0100] as well as

[0101]

[0102] Among them, R N11 and R N12 has the same defined range as in Formula N1.

[0103] In some embodiments of the present invention, the compound of formula N2 is selected from the group consisting of the following compounds:

[0104]

[0105] as well as

[0106]

[0107] Among them, R N21 and R N22 has the same defined range as in Formula N2.

[0108] In some embodiments of the present invention, the compound of formula N3 is selected from the group consisting of the following compounds:

[0109]

[0110]

[0111]

[0112] as well as

[0113]

[0114] Among them, R N31 and R N32 has the same defined range as in Formula N3.

[0115] In some embodiments of the present invention, the R N11 , R N12 , R N21 , R N22 , R N31 and R N32 Each independently represents a straight-chain alkyl group having 1 to 10 (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10) carbon atoms, a straight-chain alkoxy group having 1 to 9 (e.g. 1, 2, 3, 4, 5, 6, 7, 8 or 9) carbon atoms or a straight-chain alkenyl group having 2 to 9 (e.g. 2, 3, 4, 5, 6, 7, 8 or 9) carbon atoms.

[0116] In some embodiments of the present invention, the R N12 , R N22 and R N32 Each independently represents a straight-chain alkoxy group containing 1 to 9 carbon atoms.

[0117] In some embodiments of the present invention, the N-type compound comprises at least one (for example, 1, 2, 3 or 4, etc.) compound selected from the group consisting of a compound of formula N1-1, a compound of formula N1-2, a compound of formula N2-1, a compound of formula N3-1, a compound of formula N3-2, a compound of formula N3-6, a compound of formula N3-7, a compound of formula N3-8, and a compound of formula N3-19.

[0118] In some embodiments of the present invention, the mass percentage of N-type compounds in the liquid crystal composition is 1%-70%, for example, it can be 5%, 10%, 15%, 20%, 25%, 30%, 35%, 38%, 40%, 45%, 50%, 55%, 60%, 65%, 70% or 75%, etc., and 10%-50% is more preferred.

[0119] In some embodiments of the present invention, the mass percentage of at least one N-type compound selected from the group consisting of compounds of formula N1-1, compounds of formula N1-2, compounds of formula N2-1, compounds of formula N3-1, compounds of formula N3-2, compounds of formula N3-6, compounds of formula N3-7, compounds of formula N3-8, and compounds of formula N3-19 is 1%-50%, for example, it can be 5%, 10%, 15%, 20%, 25%, 30%, 35%, 38%, 40% or 45%, etc.

[0120] In some embodiments of the present invention, the liquid crystal composition further comprises at least one compound of formula A-1 and / or formula A-2:

[0121]

[0122] Among them, R A1 and R A2 Each independently represents -H, a linear or branched alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms, One or at least two non-adjacent -CH 2 - may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-; one or at least two -H in the aforementioned groups may be independently replaced by -F or -Cl;

[0123] ring ring ring and ring Each independently expresses Said One or at least two of the 2 - may be replaced by -O-, and the single bonds in one or at most two rings may be replaced by double bonds; -CH= in one or at least two rings of the group may be replaced by -N=; one or at least two -H in the aforementioned group may be independently replaced by -F, -Cl or -CN;

[0124] Z A11 , Z A21 and Z A22 Each independently represents a single bond, -CH 2 CH 2 -、-CF 2 CF 2 -, -CO-O-, -O-CO-, -O-CO-O-, -CH=CH-, -CF=CF-, -CH 2 O- or -OCH 2 -;

[0125] L A11 , L A12 , L A13 , L A21 and L A22 Each independently represents -H, halogen, unsubstituted or halogenated straight-chain alkyl containing 1 to 3 (e.g. 1, 2 or 3) carbon atoms;

[0126] X A1 and X A2 each independently represents halogen, haloalkyl containing 1-5 (e.g. 1, 2, 3, 4 or 5) carbon atoms, haloalkoxy containing 1-5 (e.g. 1, 2, 3, 4 or 5) carbon atoms, haloalkenyl containing 2-5 (e.g. 2, 3, 4 or 5) carbon atoms or haloalkenyloxy containing 2-5 (e.g. 2, 3, 4 or 5) carbon atoms;

[0127] n A11 Represents 0, 1, 2, or 3; when n A11 =2 or 3, the ring Same or different, Z A11 Same or different;

[0128] n A12 Indicates 1 or 2; when n A12 =2, ring the same or different; and

[0129] n A2 Represents 0, 1, 2, or 3; when n A2 =2 or 3, the ring Same or different, Z A21 Same or different.

[0130] In some embodiments of the present invention, the compound of formula A-1 is selected from the group consisting of the following compounds:

[0131]

[0132]

[0133]

[0134]

[0135] as well as

[0136]

[0137] Among them, R v and R w Each independently represents -CH 2 -or-O-;

[0138] L A11 , L A12 , L A11 ', L A12 ',L A14 , L A15 and L A16 Each independently represents -H or -F;

[0139] L A13 and L A13 'Each independently represents -H or -CH 3 ;

[0140] X A1 Indicates -F, -CF 3 or -OCF 3 ;and

[0141] v and w each independently represent 0 or 1.

[0142] In some embodiments of the present invention, the compound of formula A-2 is selected from the group consisting of the following compounds:

[0143]

[0144]

[0145]

[0146]

[0147] as well as

[0148]

[0149] Among them, L A21 , L A22 , L A23 , L A24 and L A25 Each independently represents -H or -F;

[0150] X A2 Indicates -F, -CF 3 、-OCF 3 or -CH 2 CH 2 CH=CF 2 .

[0151] In some embodiments of the present invention, the mass percentage of the compound of formula A-1 and / or the compound of formula A-2 in the liquid crystal composition is 0.1%-60%, for example, it can be 0.5%, 1%, 3%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 25%, 28%, 30%, 35%, 40%, 45%, 50% or 55%, etc.

[0152] In some embodiments of the present invention, the mass percentage of the compound of formula A-1 in the liquid crystal composition is 0.1%-30%, for example, it can be 0.5%, 1%, 3%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 25% or 28%, etc.

[0153] In some embodiments of the present invention, the mass percentage of the compound of formula A-2 in the liquid crystal composition is 0.1%-30%, for example, it can be 0.5%, 1%, 3%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 25% or 28%, etc.

[0154] In addition to the above compounds, the liquid crystal composition of the present invention may also include any one of common nematic liquid crystals, smectic liquid crystals, cholesteric liquid crystals, polymerizable monomers, and additives, or a combination of at least two thereof.

[0155] In a preferred technical solution, the liquid crystal composition further includes at least one additive.

[0156] In a preferred technical solution, the additive includes any one of a dopant, an antioxidant, an ultraviolet absorber, an infrared absorber, and a light stabilizer, or a combination of at least two of them.

[0157] Possible dopants which are preferably added to the liquid crystal composition of the present invention are shown below:

[0158]

[0159]

[0160] as well as

[0161]

[0162] In some embodiments of the present invention, the mass percentage of the dopant in the liquid crystal composition is 0%-5%; preferably, the mass percentage of the dopant in the liquid crystal composition is 0.01%-1%.

[0163] In addition, the antioxidants, light stabilizers and other additives used in the liquid crystal composition of the present invention are preferably the following:

[0164]

[0165]

[0166]

[0167] Here, n represents a positive integer from 1 to 12.

[0168] Preferably, the light stabilizer is selected from the light stabilizers shown below:

[0169]

[0170]

[0171] In some embodiments of the present invention, the mass percentage of the light stabilizer in the liquid crystal composition is 0%-5%; preferably, the mass percentage of the light stabilizer in the liquid crystal composition is 0.01%-1%, and more preferably 0.01%-0.1%.

[0172] In a second aspect, the present invention provides a liquid crystal display device, wherein the liquid crystal display device comprises the liquid crystal composition as described in the first aspect.

[0173] In a preferred technical solution, the liquid crystal display device is any one of a VA display mode, a PSVA display mode, an IPS display mode, and a NFFS display mode.

[0174] Compared with the prior art, the present invention has the following beneficial effects:

[0175] The liquid crystal composition provided by the present invention has a high elastic constant K under the condition of having appropriate clearing point, optical anisotropy and absolute value of dielectric anisotropy through the design and mutual compounding of liquid crystal components. 11 and K 33, smaller rotational viscosity γ 1 , the smaller ratio of rotational viscosity to elastic constant γ 1 / K 33 , higher transmittance, faster response speed and better low-temperature storage stability, with a wider nematic phase temperature range and higher contrast, which helps to improve the use effect of liquid crystal materials and is suitable for fast-response VA, PSVA, IPS, NFFS and other display modes. DETAILED DESCRIPTION

[0176] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0177] For ease of expression, in the following embodiments and comparative examples, the group structures of the components in the liquid crystal composition are represented by the codes listed in Table 1:

[0178] Table 1

[0179]

[0180]

[0181] Take the following compound as an example:

[0182] The structure is represented by the codes listed in Table 1, which can be expressed as: nCLWO2; where C represents 1,4-cyclohexylene, L represents 1,4-cyclohexenylene, W represents 2,3-difluoro-1,4-phenylene, and n represents the number of carbon atoms of the left-end alkyl group. For example, n is "3", which means that the alkyl group is n-propyl, and OC 2 H 5 Stands for ethoxy.

[0183] The abbreviations of the test items in the following embodiments and comparative examples are as follows:

[0184] Cp clearing point (nematic-isotropic phase transition temperature, °C)

[0185] Δn optical anisotropy (589nm, 25℃)

[0186] Δε Dielectric anisotropy (1kHz, 25℃)

[0187] K 11 Splay elastic constant (25℃)

[0188] K 33 Bending elastic constant (25℃)

[0189] γ 1Rotational viscosity (mPa·s, 25°C)

[0190] γ 1 / K 33 Ratio of rotational viscosity to bending elastic constant

[0191] Tr penetration rate (%)

[0192] LTS(-30℃) Low temperature storage time (-30℃, h)

[0193] Wherein, Cp: measured by MP70 melting point instrument;

[0194] Δn: Δn=n e -n 0 , measured using an Abbe refractometer under a sodium lamp (589nm) at 25°C;

[0195] Δε:Δε=ε ∥ -ε ⊥ , where ε ∥ is the dielectric constant parallel to the molecular axis, ε ⊥ is the dielectric constant perpendicular to the molecular axis, test conditions: 25°C, 1KHz, VA type test box with a box thickness of 6μm;

[0196] K 11 and K 33 : Calculated by testing the CV curve of the liquid crystal using an LCR meter and a VA test box. Test conditions: 6μm VA test box, V=0.1-20V;

[0197] γ 1 : Tested using LCM-2 liquid crystal property evaluation system; test conditions: 25°C, 160-240V, test box thickness 20μm;

[0198] LTS (-30℃): The nematic liquid crystal medium is placed in a glass bottle and stored at a constant temperature of -30℃, and the time recorded when crystal precipitation is observed;

[0199] Tr: Use DMS 505 photoelectric comprehensive tester to test the VT curve of the dimming device, take the maximum transmittance on the VT curve as the transmittance of the liquid crystal, the test box is negative VA type, and the box thickness is 3.5μm.

[0200] The compounds used in the following examples can be synthesized by known methods or obtained through commercial channels. These synthesis techniques are conventional, and the obtained liquid crystal compositions meet the standards of electronic compounds after testing.

[0201] Liquid crystal compositions are prepared according to the proportions of the liquid crystal compositions in the following examples. The preparation of the liquid crystal compositions is carried out according to conventional methods in the art, such as mixing in a prescribed proportion by heating, ultrasonic waves, suspension, etc.

[0202] Example 1

[0203] A liquid crystal composition comprises components in percentage by mass as shown in the following table, and performance test results are listed in the following table:

[0204]

[0205] Comparative Example 1

[0206] A liquid crystal composition comprises components in percentage by mass as shown in the following table, and performance test results are listed in the following table:

[0207]

[0208] Example 2

[0209] A liquid crystal composition comprises components in percentage by mass as shown in the following table, and performance test results are listed in the following table:

[0210]

[0211] Comparative Example 2

[0212] A liquid crystal composition comprises components in percentage by mass as shown in the following table, and performance test results are listed in the following table:

[0213]

[0214] According to the comparison between Example 2 and Comparative Example 2, the liquid crystal composition of the present invention has a higher elastic constant K while maintaining appropriate optical anisotropy, appropriate clearing point, appropriate absolute value of dielectric anisotropy and faster response speed. 11 and K 33 , smaller rotational viscosity γ 1 , the smaller ratio of rotational viscosity to elastic constant γ 1 / K 33 , higher transmittance Tr, higher contrast and better low-temperature storage stability.

[0215] Example 3

[0216] A liquid crystal composition comprises components in percentage by mass as shown in the following table, and performance test results are listed in the following table:

[0217]

[0218]

[0219] Example 4

[0220] A liquid crystal composition comprises components in percentage by mass as shown in the following table, and performance test results are listed in the following table:

[0221]

[0222] Example 5

[0223] A liquid crystal composition comprises components in percentage by mass as shown in the following table, and performance test results are listed in the following table:

[0224]

[0225]

[0226] Example 6

[0227] A liquid crystal composition comprises components in percentage by mass as shown in the following table, and performance test results are listed in the following table:

[0228]

[0229] Example 7

[0230] A liquid crystal composition comprises components in percentage by mass as shown in the following table, and performance test results are listed in the following table:

[0231]

[0232] Example 8

[0233] A liquid crystal composition comprises components in percentage by mass as shown in the following table, and performance test results are listed in the following table:

[0234]

[0235]

[0236] Example 9

[0237] A liquid crystal composition comprises components in percentage by mass as shown in the following table, and performance test results are listed in the following table:

[0238]

[0239] Example 10

[0240] A liquid crystal composition comprises components in percentage by mass as shown in the following table, and performance test results are listed in the following table:

[0241]

[0242]

[0243] Embodiment 11

[0244] A liquid crystal composition comprises components in percentage by mass as shown in the following table, and performance test results are listed in the following table:

[0245]

[0246] Example 12

[0247] A liquid crystal composition comprises components in percentage by mass as shown in the following table, and performance test results are listed in the following table:

[0248]

[0249]

[0250] Example 13

[0251] A liquid crystal composition comprises components in percentage by mass as shown in the following table, and performance test results are listed in the following table:

[0252]

[0253] According to the comparison between Example 1 and Example 13 and Comparative Example 1, the liquid crystal composition of the present invention has a relatively high elastic constant K while maintaining appropriate optical anisotropy, appropriate clearing point, and appropriate absolute value of dielectric anisotropy. 11 and K 33 , smaller rotational viscosity γ 1 , the smaller ratio of rotational viscosity to elastic constant γ 1 / K 33 , higher transmittance Tr, faster response speed and better low-temperature storage stability.

[0254] Embodiment 14

[0255] A liquid crystal composition comprises components in percentage by mass as shown in the following table, and performance test results are listed in the following table:

[0256]

[0257]

[0258] In summary, the present invention, through the compounding of liquid crystal components with specific structures, enables the liquid crystal composition to have a larger elastic constant K value, K while maintaining appropriate clearing point, optical anisotropy and absolute value of dielectric anisotropy. 11 13.53-25.8, K 33 16.27-26.93, lower rotational viscosity, γ 1 66.5-155mPa·s, smaller ratio of rotational viscosity to elastic constant, γ 1 / K 33 It is 3.95-5.76, has a faster response speed, a higher transmittance, Tr is 24.27%-25.28%, can be stably stored at -30°C for more than 720h, has better low-temperature storage stability, a wider nematic phase temperature range and better contrast.

[0259] The applicant declares that the present invention illustrates the liquid crystal composition of the present invention and the liquid crystal display device containing the same through the above-mentioned embodiments, but the present invention is not limited to the above-mentioned embodiments, that is, it does not mean that the present invention must rely on the above-mentioned embodiments to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of various raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A liquid crystal composition, It is characterized in that The liquid crystal composition comprises: At least one compound of formula I: At least one compound of formula II: Among them, R 1 represents a straight or branched alkenyl group containing 2 to 12 carbon atoms; R 2 represents a straight or branched alkyl group containing 1 to 12 carbon atoms, 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-; R 3 and R 4 Each independently represents -H, halogen, a linear or branched alkyl group containing 1 to 12 carbon atoms, The straight or branched alkyl group containing 1 to 12 carbon atoms, One or at least two non-adjacent -CH 2 - may be independently replaced by -CH=CH-, -C≡C-, -O-, -S-, -CO-, -CO-O- or -O-CO-, and one or at least two -H in the aforementioned groups may be independently replaced by -F or -Cl; ring and ring Each independently expresses Said One or at least two of the 2 - may be replaced by -O-, and the single bonds in one or at most two rings may be replaced by double bonds; One or at least two of the -H in the 3 or -OCH 3 Substitution, -CH= in one or at least two rings may be replaced by -N=; L 1 , L 2 and L 3 Each independently represents -F or -CH 3 ; G represents -O-, -S-, -CO-, -CF 2 -, -NH- or -NF-; X 1 and X 2 Each independently represents -H, 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; Z 1 and Z 2 Each independently represents a single bond, -O-, -S-, -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 -; Z 3 Indicates a single bond, -O(CH 2 ) a -or-S(CH 2 ) a -; a represents an integer from 0 to 3; n 1 and n 2 Each independently represents 0, 1 or 2; when n 1 =2, ring Same or different, Z 1 Same or different; when n 2 =2, ring Same or different, Z 2 Same or different.

2. The liquid crystal composition according to claim 1, It is characterized in that The L 1 , L 2 and L 3 Indicates -F; Preferably, the compound of formula I is selected from the group consisting of the following compounds: as well as Among them, the R 1 and R 2 has the same definition as in Formula I.

3. The liquid crystal composition according to claim 1 or 2, It is characterized in that The R 1 express * indicates the carbon atom in the bonded ring structure; Preferably, the R 2 It represents a straight-chain alkyl group having 1 to 8 carbon atoms, a straight-chain alkoxy group having 1 to 6 carbon atoms, or a straight-chain alkenyl group having 2 to 6 carbon atoms, and more preferably a straight-chain alkoxy group having 1 to 6 carbon atoms.

4. The liquid crystal composition according to any one of claims 1 to 3, It is characterized in that The G represents -O- or -S-; Preferably, the X 1 and X 2 Indicates -F; Preferably, the compound of formula II is selected from the group consisting of the following compounds: as well as Further preferably, the compound of formula II is selected from the group consisting of the following compounds: as well as Among them, the R 3 , R 4 and Z 3 Having the same definition as in Formula II; Preferably, the R 3 represents a straight-chain alkyl group containing 1 to 8 carbon atoms or a straight-chain alkoxy group containing 1 to 6 carbon atoms, and more preferably a straight-chain alkoxy group containing 1 to 6 carbon atoms; Preferably, the Z 3 Represents a single bond, -O- or -OCH 2 -; Preferably, the R 4 represents a straight-chain alkyl group containing 1 to 8 carbon atoms, a straight-chain alkenyl group containing 2 to 6 carbon atoms, a straight-chain alkoxy group containing 1 to 6 carbon atoms, a straight-chain alkenyloxy group containing 2 to 6 carbon atoms, One or at least two -H in the aforementioned groups may be independently substituted by -F or -Cl; Preferably, the R 4 represents a straight-chain alkyl group containing 1 to 8 carbon atoms, a straight-chain alkoxy group containing 1 to 6 carbon atoms, 5. The liquid crystal composition according to any one of claims 1 to 4, It is characterized in that The mass percentage of the compound of formula I in the liquid crystal composition is 1%-30%, preferably 2%-25%; Preferably, the mass percentage of the compound of formula II in the liquid crystal composition is 1%-30%, more preferably 3%-20%.

6. The liquid crystal composition according to any one of claims 1 to 5, It is characterized in that The liquid crystal composition further comprises at least one compound of formula M: Among them, R M1 and R M2 Each independently represents a straight or branched alkyl group containing 1 to 12 carbon atoms, 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-; ring ring and ring Each independently expresses Said One or at least two of the 2 - can be replaced by -O-, At most one -H in may be replaced by halogen; Z M1 and Z M2 Each independently represents a single bond, -CO-O-, -O-CO-, -CH 2 O-、-OCH 2 -、-CH=CH-、-CH 2 CH 2 -or-(CH 2 ) 4 -; n M1 represents 0, 1, 2, or 3, where n M1 =2 or 3, the ring Same or different, Z M2 Same or different.

7. The liquid crystal composition according to claim 6, It is characterized in that The compound of formula M is selected from the group consisting of the following compounds: as well as Among them, R M1 and R M2 Each independently represents a straight-chain or branched alkyl group containing 1 to 10 carbon atoms, wherein one or two or more non-adjacent -CH 2 - may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-; Preferably, the R M1 and R M2 Each independently represents a straight-chain alkyl group containing 1 to 10 carbon atoms, a straight-chain alkoxy group containing 1 to 9 carbon atoms, or a straight-chain alkenyl group containing 2 to 9 carbon atoms; Preferably, the compound of formula M comprises at least one compound selected from the group consisting of a compound of formula M-1, a compound of formula M-5, a compound of formula M-14, a compound of formula M-22, a compound of formula M-29, a compound of formula M-30, a compound of formula M-37, a compound of formula M-39, a compound of formula M-42, a compound of formula M-45, a compound of formula M-47, a compound of formula M-48, a compound of formula M-49, a compound of formula M-50, a compound of formula M-51, a compound of formula M-57, and a compound of formula M-58; Further preferably, the compound of formula M comprises at least one compound selected from the group consisting of a compound of formula M-1, a compound of formula M-5, a compound of formula M-14, a compound of formula M-22, a compound of formula M-30, a compound of formula M-45, and a compound of formula M-47; Preferably, the mass percentage of the compound of formula M in the liquid crystal composition is 1%-80%, more preferably 30%-75%; Preferably, the mass percentage of at least one compound of formula M selected from the group consisting of compounds of formula M-1, compounds of formula M-5, compounds of formula M-14, compounds of formula M-22, compounds of formula M-30, compounds of formula M-45, and compounds of formula M-47 is 1%-75%.

8. The liquid crystal composition according to any one of claims 1 to 7, It is characterized in that The liquid crystal composition further comprises at least one N-type compound, wherein the N-type compound is selected from the group consisting of a compound of formula N1, a compound of formula N2, and a compound of formula N3: Among them, R N11 , R N12 , R N21 , R N22 , R N31 and R N32 Each independently represents a straight or branched alkyl group containing 1 to 12 carbon atoms, 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-; ring ring and ring Each independently expresses in One or at least two of the 2 - may be replaced by -O-, and one or at most two single bonds in the ring may be replaced by double bonds, wherein One or at least two -H in the ring may be independently replaced by -F, -Cl or -CN, and -CH= in one or at least two rings may be replaced by -N=; ring express in One or at least two of the 2 - may be replaced by -O-, and one or at most two single bonds in the ring may be replaced by double bonds, wherein -CH= in one or at least two rings may be replaced by -N=; Z N1 represents -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 -; Z N2 and Z N3 Each independently 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 -; L N11 , L N12 , L N21 , L N22 , L N31 and L N32 Each independently represents -H, halogen, a straight-chain or branched alkyl group containing 1 to 3 carbon atoms, or a straight-chain or branched alkoxy group containing 1 to 3 carbon atoms; n N1 Indicates 0 or 1; n N2 Indicates 1, 2, or 3, n N3 Represents 0 or 1, and 2≤n N2 +n N3 ≤3, when n N2 When it means 2 or 3, the ring Same or different, Z N2 Same or different.

9. The liquid crystal composition according to claim 8, It is characterized in that The compound of formula N1 is selected from the group consisting of the following compounds: as well as Among them, R N11 and R N12 Having the same defined range as in formula N1; Preferably, the compound of formula N2 is selected from the group consisting of the following compounds: as well as Among them, R N21 and R N22 Having the same defined range as in formula N2; Preferably, the compound of formula N3 is selected from the group consisting of the following compounds: as well as Among them, R N31 and R N32 Having the same defined range as in formula N3; Preferably, the R N11 , R N12 , R N21 , R N22 , R N31 and R N32 Each independently represents a straight-chain alkyl group containing 1 to 10 carbon atoms, a straight-chain alkoxy group containing 1 to 9 carbon atoms, or a straight-chain alkenyl group containing 2 to 9 carbon atoms; Preferably, the R N12 , R N22 and R N32 Each independently represents a straight chain alkoxy group containing 1 to 9 carbon atoms; Preferably, the N-type compound comprises at least one compound selected from the group consisting of a compound of formula N1-1, a compound of formula N1-2, a compound of formula N2-1, a compound of formula N3-1, a compound of formula N3-2, a compound of formula N3-6, a compound of formula N3-7, a compound of formula N3-8, and a compound of formula N3-19; Preferably, the mass percentage of the N-type compound in the liquid crystal composition is 1%-70%, more preferably 10%-50%; Preferably, the mass percentage of at least one N-type compound selected from the group consisting of compounds of formula N1-1, compounds of formula N1-2, compounds of formula N2-1, compounds of formula N3-1, compounds of formula N3-2, compounds of formula N3-6, compounds of formula N3-7, compounds of formula N3-8, and compounds of formula N3-19 is 1%-50%.

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

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