Liquid crystal composition and liquid crystal display device containing same

Abstract

Provided in the present application are a liquid crystal composition and a liquid crystal display device containing same. The liquid crystal composition contains at least one compound of formula I, and at least one stabilizer. A stabilizer having a specific structure is compounded with a compound of formula I having a dibenzo structure, such that on the basis of maintaining appropriate clearing points, an appropriate optical anisotropy and an appropriate dielectric anisotropy, the liquid crystal composition has higher elastic constants K11 and K33, a lower rotational viscosity γ1, a shorter response time RT, a faster response speed, a higher transmittance Tr, a higher contrast ratio CR and a better low-temperature storage stability, a wider nematic phase temperature range is achieved, image sticking is reduced or image sticking decay is accelerated, a higher voltage holding ratio (VHR) is achieved, the improvement to the overall use effect of a liquid crystal material is facilitated, and the liquid crystal composition is applicable to fast-response display modes such as VA, PSVA, IPS and NFFS.

Description

Liquid crystal composition and liquid crystal display device containing the same Technical Field

[0001] The present application belongs to the technical field of liquid crystal materials, and specifically relates to a liquid crystal composition and a liquid crystal display device containing the same. Background Art

[0002] Liquid crystal displays (LCDs) have experienced rapid development due to their compact size, light weight, low power consumption, and excellent display quality, finding widespread application, particularly in portable electronic information products. As the size of LCD screens for portable computers, office applications, and video applications increased, LCDs became suitable for larger screens and eventually replaced cathode ray tube (CRT) displays.

[0003] Compared to traditional display devices and materials, liquid crystal display materials offer significant advantages: low driving voltage, minimal power consumption, high reliability, large amounts of displayed information, color display, flicker-free display, no harmful effects on the human body, automated production processes, low cost, the ability to manufacture LCDs of various specifications and types, and portability. These advantages have profoundly impacted the display and imaging fields, promoting the development of microelectronics and optoelectronic information technologies. Liquid crystal materials, with their excellent optical properties and photoelectric effect, have found widespread application in numerous display applications.

[0004] Dibenzoylmethane These are a relatively new class of liquid crystal monomer materials, where R and R' represent hydrogen, alkyl, cycloalkyl, alkoxy, tetrahydrofuran, or tetrahydrothiophene groups; and M represents an oxygen or sulfur atom. Due to their characteristic benzofuran or benzothiophene structures, dibenzofuran compounds offer advantages such as high elastic constants, high dielectric constants, and structural stability. They offer excellent performance in TFT liquid crystals requiring fast response, high transmittance, and high contrast.

[0005] Although dibenzofuran compounds offer advantages such as lower threshold voltage and faster response time in liquid crystal display devices due to their larger dielectric constants, they are highly electronegative. When liquid crystal mixtures containing them are exposed to external stress (especially one-drop filling, liquid crystal droplet injection (ODF)), sealant curing, UV / backlight irradiation, and other conditions, they are susceptible to adsorption of impurity ions in the device and free radicals in the polyimide alignment layer. This can lead to reduced reliability of the liquid crystal mixture, such as resistivity and voltage holding ratio (VHR). This can also cause image stickiness, poor dissipation, and image retention after prolonged power-on operation, reducing the stability of the liquid crystal mixture. Therefore, there is an urgent need for a liquid crystal material that can combine the advantages of dibenzofuran compounds while compensating for the reduced reliability and image retention caused by external stress. Summary of the Invention

[0006] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

[0007] The present application provides a liquid crystal composition and a liquid crystal display device containing the same. The liquid crystal composition has low viscosity, large elastic constant, fast response speed, high transmittance, good low-temperature storage stability, wider nematic phase temperature range and better contrast while maintaining appropriate clearing point, optical anisotropy and dielectric anisotropy, and can eliminate image viscosity residue or accelerate the dissipation of image residue.

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

[0009] At least one compound of formula I:

[0010] as well as

[0011] At least one stabilizer selected from the group consisting of:

[0012] wherein R1 represents -H, halogen, 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, The straight or branched alkyl group containing 1 to 12 carbon atoms, One or at least two non-adjacent -CH2- in the group 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 group may be independently replaced by -F or -Cl;

[0013] R2 represents a haloalkyl group containing 1 to 3 (e.g., 1, 2 or 3) carbon atoms, in One or at most two single bonds in the ring may be replaced by double bonds;

[0014] ring and Ring Each independently expresses described One or at least two -CH2- in the ring may be replaced by -O-, and one or at most two single bonds in the ring may be replaced by double bonds; One or at least two -H in the ring may be replaced by -F, -Cl, -CN, -CH3 or -OCH3, and one or at least two -CH= in the ring may be replaced by -N=;

[0015] Z1 and Z2 each independently represent a single bond, -O-, -S-, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, -CF2CF2-, -(CH2)4-, -CF2O- or -OCF2-;

[0016] Z3 represents a single bond, -O(CH2) a -or-S(CH2) a -; a represents an integer from 0 to 5, for example, 0, 1, 2, 3, 4 or 5;

[0017] L1 and L2 each independently represent -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;

[0018] G represents -O-, -S-, -CO-, -CF2-, -NH- or -NF-;

[0019] X represents -H, -OH, -O* or a linear or branched alkyl group containing 1 to 5 (e.g., 1, 2, 3, 4 or 5) carbon atoms; one or at least two non-adjacent -CH2- in the linear or branched alkyl group containing 1 to 5 carbon atoms may be independently replaced by -O- or -CO-; -O* represents an oxygen free radical;

[0020] n1 represents 0 or 1;

[0021] n2 represents 0, 1 or 2; when n2 = 2, the ring Same or different, Z2 same or different;

[0022] n represents an integer of 1-20, for example, it can be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 or 20.

[0023] The present application has found that in the process of applying an oversaturation voltage, the ions in the liquid crystal and the device continue to gather near the upper and lower electrode plates under the action of the DC bias. After the power is removed, the ions are not easy to dissipate and the internal electric field formed causes the liquid crystal to still deflect, the brightness slowly decreases, and image residue is formed. The liquid crystal composition provided by the present application contains at least one stabilizer, and the stabilizer is selected from the group consisting of the compound of formula II-1, the compound of formula II-2, the compound of formula II-3, and the compound of formula II-4, which is a hindered amine light stabilizer that can adsorb ions / free radicals, eliminate the internal electric field, and quickly dissipate the residual image. In the present application, a stabilizer of a specific structure is compounded with a compound of formula I having a dibenzo structure, so that the liquid crystal composition has a higher elastic constant (K 11 and K 33 ), smaller rotational viscosity γ1, shorter response time RT and faster response speed, higher transmittance Tr, higher contrast CR and better low-temperature storage stability, which make the nematic phase temperature range wider, and reduce image viscosity residue or accelerate the dissipation of image residue, have a higher voltage holding rate VHR, which helps to improve the overall use effect of liquid crystal materials and is suitable for fast-response VA, PSVA, IPS, NFFS and other display modes.

[0024] The following are preferred technical solutions of this application, but are not intended to limit the technical solutions provided in this application. Through the following preferred technical solutions, the objectives and beneficial effects of this application can be better achieved and realized.

[0025] The 1-12 carbon atoms in the present application may be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12 carbon atoms; the 1-3 carbon atoms may be 1, 2 or 3 carbon atoms; the 1-5 carbon atoms may be 2, 3, 4 or 5 carbon atoms; the halogen includes F, Cl, Br or I; when the same description is referred to below, they have the same meaning; the "halogenated" means that at least one -H in the group is replaced by a halogen (-F, -Cl, -Br or -I); when the same description is referred to below, they have the same meaning; when n2=2 in the present application, there are 2 rings in the compound These two They may have the same structure or different structures. For example, one may be Another one is The expressions "same or different" in this application have the same meaning; in this application, "can be replaced by..." means that it can be replaced or not replaced, that is, replacement or non-replacement falls within the scope of protection of this application. The same applies to "can be replaced by...", and the positions of "replacement" and "replacement" can be arbitrary; the short straight lines on one or both sides of the group structure represent access bonds, not methyl groups, for example The short straight line on the left, Short straight lines on both sides.

[0026] In some embodiments of the present application, the G represents -O- or -S-.

[0027] In some embodiments of the present application, L1 and L2 represent -F.

[0028] In some embodiments of the present application, the compound of formula I is selected from the group consisting of the following compounds:

[0029] as well as

[0030] wherein said R1, R2 and Z3 have the same defined ranges as in formula I;

[0031] Y1 and Y2 each independently represent -O- or -CH2-.

[0032] In some preferred embodiments of the present application, the compound of formula I is selected from at least one (eg, 1, 2, 3 or 4, etc.) group consisting of compounds of formula I-1 and compounds of formula I-2:

[0033] as well as

[0034] In some embodiments of the present application, R1 represents a straight-chain alkyl group containing 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms or a straight-chain alkoxy group containing 1-6 (e.g., 1, 2, 3, 4, 5, or 6) carbon atoms, and a straight-chain alkoxy group containing 1-6 carbon atoms is further preferred.

[0035] In some embodiments of the present application, the Z3 represents a single bond, -O-, -OCH2- or -OCH2CH2-. In some embodiments of the present application, the R2 represents a fluoroalkyl group containing 1 to 3 carbon atoms, Preferred -CF3, Further preferred are -CF3, Further optimization

[0036] In some embodiments of the present application, the compound of formula I is selected from the group consisting of the following compounds:

[0037] as well as

[0038] wherein R2′ represents a halogenated straight-chain alkyl group containing 1-3 (e.g., 1, 2, or 3) carbon atoms, preferably a fluorinated straight-chain alkyl group containing 1-3 (e.g., 1, 2, or 3) carbon atoms, and further preferably -CF3;

[0039] ring express Further optimization

[0040] In some embodiments of the present application, the mass percentage of the compound of formula I in the liquid crystal composition is 1%-30%, for example, it can be 3%, 5%, 6%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 25% or 28%, etc., preferably 2%-20%, and further preferably 8%-16%.

[0041] In some embodiments of the present application, the mass percentage of at least one (for example, 1, 2, 3 or 4, etc.) compound of formula I selected from the group consisting of compounds of formula I-1 and compounds of formula I-2 is 1%-29%, for example, it can be 3%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 25%, 28% or 29%, etc., preferably 2%-20%.

[0042] In some embodiments of the present application, X represents -H, -OH, -O*, a linear or branched alkyl group containing 1-5 carbon atoms, a linear or branched alkoxy group containing 1-5 carbon atoms, or a linear or branched acyl group containing 1-5 carbon atoms.

[0043] In some embodiments of the present application, X represents -H, -OH, -O*, -CH3, -OCH3 or -CO-CH3.

[0044] In some embodiments of the present application, n represents an integer of 2-16, and more preferably an integer of 2-14.

[0045] In some embodiments of the present application, the stabilizer comprises at least one selected from the group consisting of a compound of Formula II-3 and a compound of Formula II-4.

[0046] In some embodiments of the present application, the stabilizer comprises at least one selected from the group consisting of a compound of Formula II-1 and a compound of Formula II-3.

[0047] In some embodiments of the present application, the stabilizer comprises at least one compound selected from the group consisting of compounds of formula II-1, compounds of formula II-2, compounds of formula II-3, and compounds of formula II-4, wherein X represents -OH, -O*, -CH3, -OCH3, or -CO-CH3.

[0048] In some embodiments of the present application, the mass percentage of the stabilizer in the liquid crystal composition is 0.001%-0.1%, for example, it can be 0.002%, 0.003%, 0.005%, 0.008%, 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, 0.06%, 0.07%, 0.08% or 0.09%, etc., preferably 0.002%-0.05%.

[0049] In some embodiments of the present application, the liquid crystal composition further comprises at least one compound of formula N:

[0050] Among them, R N1 and R N2 Each independently represents a straight or branched alkyl group containing 1 to 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms, One or at least two non-adjacent -CH2- in the linear or branched alkyl group containing 1 to 12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-;

[0051] ring and Ring Each independently expresses in One or at least two -CH2- in the ring 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 one or at least two -CH= in the ring may be replaced by -N=;

[0052] L N1 and L N2 Each independently represents -H, halogen, a linear or branched alkyl group containing 1 to 3 (e.g., 1, 2, or 3) carbon atoms, or a linear or branched alkoxy group containing 1 to 3 (e.g., 1, 2, or 3) carbon atoms;

[0053] Z N1 and Z N2 Each independently represents a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, -CF2CF2-, -(CH2)4-, -CF2O- or -OCF2-;

[0054] n N1 Indicates 0, 1, 2, or 3, n N2 Represents 0 or 1, and 0≤n N1 +n N2 ≤3;

[0055] When n N1 When it means 2 or 3, the ring Same or different, Z N1 Same or different.

[0056] In some embodiments of the present application, the compound of formula N is selected from the group consisting of the following compounds:

[0057] as well as

[0058] Among them, R N1 and R N2 Has the same definition as in Formula N.

[0059] In some embodiments of the present application, the R N1 and R N2 Each independently represents a straight-chain alkyl group containing 1 to 10 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10) carbon atoms, a straight-chain alkoxy group containing 1 to 9 (e.g., 1, 2, 3, 4, 5, 6, 7, 8 or 9) carbon atoms, or a straight-chain alkenyl group containing 2 to 9 (e.g., 2, 3, 4, 5, 6, 7, 8 or 9) carbon atoms.

[0060] In some embodiments of the present application, the R N2represents a straight-chain alkoxy group containing 1 to 9 carbon atoms.

[0061] In some preferred embodiments of the present application, the compound of formula N comprises at least one (for example, 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14 or 16, etc.) compound selected from the group consisting of compounds of formula N-2, compounds of formula N-3, compounds of formula N-5, compounds of formula N-6, compounds of formula N-10, compounds of formula N-11, compounds of formula N-12, compounds of formula N-25, and compounds of formula N-29.

[0062] In some preferred embodiments of the present application, the compound of formula N comprises at least one (eg, 1, 2, or 3, etc.) compound of formula N-12.

[0063] In some preferred embodiments of the present application, the compound of formula N comprises at least one (eg, 1, 2, 3, 4 or 5, etc.) compound selected from the group consisting of compounds of formula N-3 and compounds of formula N-6.

[0064] In some embodiments of the present application, the mass percentage of the compound of formula N in the liquid crystal composition is 1%-75%, for example, it can be 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 25%, 28%, 30%, 35%, 38%, 38.5%, 40%, 45%, 47.5%, 48.5%, 49%, 49.5%, 50%, 51%, 51.5%, 55%, 58%, 60%, 65%, 68%, 70% or 73%, etc., and more preferably 20%-65%.

[0065] In some embodiments of the present application, at least one (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14 or 16, etc.) compound of formula N-2, compound of formula N-3, compound of formula N-5, compound of formula N-6, compound of formula N-10, compound of formula N-11, compound of formula N-12, compound of formula N-25, compound of formula N-29 is selected from the group consisting of compounds of formula N. The mass percentage of the substance is 1%-73%, for example, it can be 5%, 8%, 10%, 12%, 15%, 18%, 20%, 22%, 25%, 28%, 30%, 35%, 38%, 38.5%, 40%, 45%, 47.5%, 48.5%, 49%, 49.5%, 50%, 51%, 51.5%, 55%, 58%, 60%, 65%, 70% or 73%, and more preferably 20%-65%.

[0066] In some embodiments of the present application, the liquid crystal composition further comprises at least one compound of formula M:

[0067] 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 -CH2- in the linear or branched alkyl group containing 1 to 12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-;

[0068] ring ring and Ring Each independently expresses described One or at least two -CH2- in the ring may be replaced by -O-, and one or at most two single bonds in the ring may be replaced by double bonds; At most one -H in may be replaced by halogen;

[0069] Z M1 and Z M2 Each independently represents a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -CH2CH2- or -(CH2)4-;

[0070] n M1 represents 0, 1, 2, or 3, where n M1 =2 or 3, the ring Same or different, Z M2 Same or different.

[0071] In some embodiments of the present application, the compound of formula M is selected from the group consisting of the following compounds:

[0072] as well as

[0073] Among them, R M1 and R M2Each 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, and one or two or more non-adjacent -CH2- in the straight-chain or branched alkyl group containing 1 to 10 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-.

[0074] In some embodiments of the present application, the R M1 and R M2 Each independently represents a straight-chain alkyl group containing 1 to 10 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10) carbon atoms, a straight-chain alkoxy group containing 1 to 9 (e.g., 1, 2, 3, 4, 5, 6, 7, 8 or 9) carbon atoms, or a straight-chain alkenyl group containing 2 to 9 (e.g., 2, 3, 4, 5, 6, 7, 8 or 9) carbon atoms, preferably a straight-chain alkyl group containing 1 to 10 carbon atoms or a straight-chain alkenyl group containing 2 to 9 carbon atoms.

[0075] In some embodiments of the present application, the compound of formula M comprises at least one (for example, 1, 2, 3, 4, 5 or 6, etc.) compound selected from the group consisting of compounds of formula M-1, compounds of formula M-14, compounds of formula M-22, compounds of formula M-29, compounds of formula M-30, compounds of formula M-37, and compounds of formula M-45.

[0076] In some embodiments of the present application, the compound of formula M is selected from the group consisting of the following compounds:

[0077] as well as

[0078] in,

[0079] R M11 and R M21 each independently represents a straight-chain alkenyl group containing 2 to 8 (e.g., 2, 3, 4, 5, 6, 7 or 8) carbon atoms;

[0080] R M1 and R M2 Each independently represents a straight-chain alkyl group containing 1 to 10 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10) carbon atoms, or a straight-chain alkoxy group containing 1 to 9 (e.g., 1, 2, 3, 4, 5, 6, 7, 8 or 9) carbon atoms.

[0081] The alkenyl group in the present application is preferably a group represented by any one of formulas (V1) to (V9), and is particularly preferably represented by formula (V1), formula (V2), formula (V8), or formula (V9). The groups represented by formulas (V1) to (V9) are as follows: Here, “*” represents the carbon atom in the ring structure to which it is bonded.

[0082] In some embodiments of the present application, 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%, 18%, 20%, 25%, 28%, 30%, 35%, 38%, 38.5%, 39%, 40%, 41.5%, 42%, 43.5%, 45%, 50%, 52%, 55%, 58%, 60%, 62%, 65%, 68%, 70% or 75%, etc., and more preferably 15%-50%.

[0083] In some embodiments of the present application, the mass percentage of at least one (for example, 1, 2, 3, 4, 5, 6, etc.) compound of formula M selected from the group consisting of compounds of formula M-1, compounds of formula M-14, compounds of formula M-22, compounds of formula M-29, compounds of formula M-30, compounds of formula M-37, and compounds of formula M-45 is 1%-75%, for example, it can be 2%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, 25%, 28%, 30%, 35%, 38%, 38.5%, 39%, 40%, 41.5%, 42%, 43.5%, 45%, 50%, 52%, 55%, 58%, 60%, 62%, 65%, 68%, 70% or 75%, etc., and further preferably 15%-50%.

[0084] In addition to the above compounds, the liquid crystal composition of the present application may also include any one or a combination of at least two of common nematic liquid crystals, smectic liquid crystals, cholesteric liquid crystals, polymerizable monomers or additives.

[0085] In a preferred embodiment, the liquid crystal composition further comprises at least one additive.

[0086] In a preferred embodiment, the additive includes any one or a combination of at least two of a dopant, an antioxidant, an ultraviolet absorber, an infrared absorber or other light stabilizers.

[0087] It should be noted that the other light stabilizers refer to light stabilizers different from the compound of formula II-1, the compound of formula II-2, the compound of formula II-3, and the compound of formula II-4.

[0088] Possible dopants that are preferably added to the liquid crystal composition of the present application are shown below:

[0089] as well as

[0090] Here, “+” indicates a chiral site.

[0091] In some embodiments of the present application, 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%.

[0092] In addition, the antioxidants or other light stabilizers used in the liquid crystal composition of the present application are preferably the following:

[0093] Here, x represents a positive integer from 1 to 12.

[0094] Exemplarily, the other light stabilizers are selected from the light stabilizers shown below:

[0095] In some embodiments of the present application, the mass percentage of other light stabilizers in the liquid crystal composition is 0%-5%; preferably, the mass percentage of other light stabilizers in the liquid crystal composition is 0.01%-1%, and more preferably 0.01%-0.1%.

[0096] In a second aspect, the present application provides a liquid crystal display device, comprising the liquid crystal composition as described in the first aspect.

[0097] In a preferred embodiment, the liquid crystal display device is any one of a VA display mode, a PSVA display mode, an IPS display mode or a NFFS display mode.

[0098] Compared with the related art, this application has the following beneficial effects:

[0099] In the liquid crystal composition provided in the present application, a stabilizer of a specific structure is compounded with a compound of formula I having a dibenzo structure, so that it has a higher elastic constant K while maintaining an appropriate clearing point, optical anisotropy and dielectric anisotropy. 11 and K 33, smaller rotational viscosity γ1, shorter response time RT, faster response speed, higher transmittance Tr, higher contrast CR and better low-temperature storage stability, with a wider nematic phase temperature range, and reduce image viscosity residue or accelerate the dissipation of image residue, with a higher voltage holding rate VHR, which helps to improve the overall use effect of liquid crystal materials and is suitable for fast-response VA, PSVA, IPS, NFFS and other display modes.

[0100] Still other aspects will become apparent upon reading and understanding the detailed description. DETAILED DESCRIPTION

[0101] The technical solution of the present application is further described below through specific implementation methods. Those skilled in the art should understand that the embodiments are only used to help understand the present application and should not be regarded as specific limitations of the present application.

[0102] For ease of expression, in the following examples and comparative examples, the group structures of the components in the liquid crystal composition are represented by the codes listed in Table 1:

[0103] Table 1

[0104] Take the following compound as an example:

[0105] The structure is represented by the codes listed in Table 1 as follows: nCLWO2; wherein C represents 1,4-cyclohexylene, L represents 1,4-cyclohexenylene, W represents 2,3-difluoro-1,4-phenylene, n represents the number of carbon atoms of the left-end alkyl group, for example, if n is "3", it means that the alkyl group is n-propyl, and OC2H5 represents ethoxy.

[0106] The abbreviations of the test items in the following examples and comparative examples are as follows: Cp clearing point (nematic-isotropic phase transition temperature, °C) Δn optical anisotropy (589 nm, 25 °C) Δε dielectric anisotropy (1 kHz, 25 °C) K 11 Splay elastic constant (25℃) K 33Bending elastic constant (25℃) γ1 Rotational viscosity (mPa·s, 25℃) Tr Transmittance (%) CR Contrast ratio (bright state transmittance / dark state transmittance, 25℃) RT Response time (ms) LTS (-40℃) Low temperature storage time (-40℃, h) IS Dissipation time Dissipation time of image sticking (min)

[0107] Wherein, Cp: measured by MP70 melting point apparatus;

[0108] Δn: Δn=n e -n o , measured using an Abbe refractometer under a sodium lamp (589nm) at 25°C;

[0109] 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, 1 kHz, VA-type test cell with a cell thickness of 6 μm.

[0110] K 11 and K 33 : Calculated using an LCR meter and a VA test cell to test the CV curve of the liquid crystal. Test conditions: 6μm VA test cell, V = 0.1-20V;

[0111] γ1: measured using the LCM-2 liquid crystal property evaluation system; test conditions: 25°C, 160-240V, test cell thickness 20μm;

[0112] Tr: Use the DMS 505 photoelectric integrated tester to test the VT curve of the dimming device. The maximum transmittance on the VT curve is taken as the transmittance of the liquid crystal. The test cell is a negative FFS cell with a cell thickness of 3μm.

[0113] RT: measured at 25°C using a DMS 505 tester. Test conditions: 25°C, V90 drive, and a 3μm thick negative FFS test cell.

[0114] CR: Use DMS 505 tester to test the transmittance of the liquid crystal cell at 255 grayscale voltage and 0 grayscale voltage, that is, T r255 and T r0 , by T r255 / T r0 The test conditions were: 25°C, 3 μm thick negative FFS test cell;

[0115] LTS (-40°C): The time when the nematic liquid crystal medium is placed in a glass bottle and stored at a constant temperature of -40°C and the precipitation of crystals is observed;

[0116] IS dissipation time: Use DMS 505 photoelectric comprehensive tester to apply supersaturation voltage (13V) to a FFS box for 2 hours and then apply L 64 Grayscale voltage, at this time, read and record the brightness value at regular intervals, time-brightness curve L-t1, apply a low voltage (0.1V) for 2h to another FFS box, and then apply L 64 Grayscale voltage, at this time, read and record the brightness value at regular intervals to obtain the time-brightness curve L-t2, and then take the difference between the L-t1 and L-t2 curves to obtain the relative afterimage dissipation curve △Lt; when △L is zero, the afterimage is considered to have completely disappeared, and the time t at this time is recorded as the IS dissipation time, where the box thickness of the FFS box is 3μm.

[0117] The compounds used in the following examples and comparative examples can be synthesized by known methods or obtained through commercial channels. These synthesis techniques are conventional, and the resulting liquid crystal compositions have been tested to meet the standards of electronic compounds.

[0118] Liquid crystal compositions were prepared according to the proportions of the liquid crystal compositions in the following examples and comparative examples. The liquid crystal compositions were prepared according to conventional methods in the art, such as mixing in a prescribed proportion by heating, ultrasonication, or suspension.

[0119] Comparative Example 1

[0120] A liquid crystal composition comprises the components in the following mass percentages, and the performance test results thereof are listed in the following table:

[0121] Comparative Example 2

[0122] A liquid crystal composition comprises the components in the following mass percentages, and the performance test results thereof are listed in the following table:

[0123] Comparative Example 3

[0124] A liquid crystal composition comprises the components in the following mass percentages, and the performance test results thereof are listed in the following table:

[0125] The amount of the stabilizer is calculated based on the amount of other liquid crystal components as 100%. Taking Comparative Example 3 as an example, the total amount of other liquid crystal components is 100%, and the added amount of the stabilizer is 0.003%. The following embodiments or comparative examples involving stabilizers have the same description and are not repeated here.

[0126] Example 1

[0127] A liquid crystal composition comprises the components in the following mass percentages, and the performance test results thereof are listed in the following table:

[0128] Example 2

[0129] A liquid crystal composition comprises the components in the following mass percentages, and the performance test results thereof are listed in the following table:

[0130] Example 3

[0131] A liquid crystal composition comprises the components in the following mass percentages, and the performance test results thereof are listed in the following table:

[0132] Example 4

[0133] A liquid crystal composition comprises the components in the following mass percentages, and the performance test results thereof are listed in the following table:

[0134] Example 5

[0135] A liquid crystal composition comprises the components in the following mass percentages, and the performance test results thereof are listed in the following table:

[0136] Example 6

[0137] A liquid crystal composition comprises the components in the following mass percentages, and the performance test results thereof are listed in the following table:

[0138] Example 7

[0139] A liquid crystal composition comprises the components in the following mass percentages, and the performance test results thereof are listed in the following table:

[0140] Example 8

[0141] A liquid crystal composition comprises the components in the following mass percentages, and the performance test results thereof are listed in the following table:

[0142] Example 9

[0143] A liquid crystal composition comprises the components in the following mass percentages, and the performance test results thereof are listed in the following table:

[0144] Comparing Examples 1-9 of the present application with Comparative Examples 1-3, it can be seen that the compound of Formula I is not included in Comparative Example 1, and its elastic constant K is on the small side, the dielectric anisotropy is small, the response speed is slow, and the contrast is not high; the compound of Formula I is included in Comparative Example 2, but the stabilizer of the specific structure is not included, the image disappearance rate is slow, and its image retention is more serious than Comparative Example 1; the end group of the dibenzo compound included in Comparative Example 3 is different from R2 in Formula I defined in the present application, resulting in its elastic constant K being on the small side, the contrast is small, and the low-temperature storage performance is poor. In Examples 1-9, by the design and compounding of the compound of Formula I and the specific stabilizer, the K value, the transmittance and the contrast are improved, the dielectric anisotropy is increased, the response speed is improved, the low-temperature storage is improved, and the ion dissipation rate in the device is further improved, the image retention is reduced, and the problem of poor afterimage caused by the use of the large dielectric compound of Formula I is improved.

[0145] In summary, the present invention provides a liquid crystal composition with a larger elastic constant K value, K, while maintaining appropriate clearing point, optical anisotropy and absolute value of dielectric anisotropy, by compounding liquid crystal components with specific structures. 11 14.2-15.9, K 33 It is 15.2-17.2, with lower rotational viscosity, γ1 of 73-76mPa·s, short response time, RT of 21.24-23.35ms, faster response speed, higher transmittance, Tr of 14.3%-15.2%, contrast CR of 1298-1451, and can be stably stored at -40°C for more than 144 hours. It has better low-temperature storage stability, a wider nematic phase temperature range and better contrast, and a short IS dissipation time, which reduces image viscosity residue or accelerates the dissipation of image residue, thereby improving the overall use effect of the liquid crystal material.

[0146] The applicant declares that this application uses the above-mentioned embodiments to illustrate the liquid crystal composition and liquid crystal display device containing the same, but this application is not limited to the above-mentioned embodiments, that is, it does not mean that this application must rely on the above-mentioned embodiments to be implemented. Those skilled in the art should understand that any improvements to this application, equivalent replacement of various raw materials of the product of this application, addition of auxiliary components, selection of specific methods, etc., all fall within the scope of protection and disclosure of this application.

Claims

1. A liquid crystal composition, comprising: At least one compound of formula I: and At least one stabilizer, the stabilizer being selected from the group consisting of the following compounds: Among them, R1 represents -H, halogen, a linear or branched alkyl group having 1 to 12 carbon atoms, The straight-chain or branched-chain alkyl group having 1 to 12 carbon atoms, one or at least two non-adjacent -CH2- therein may be independently replaced by -CH=CH-, -C≡C-, -O-, -S-, -CO-, -CO-O- or -O-CO- respectively, and one or at least two -H in the foregoing groups may be independently replaced by -F or -Cl; R2 represents a haloalkyl group having 1 to 3 carbon atoms, Among them one or at most two single bonds in the ring therein may be replaced by double bonds; Ring Sum ring Each independently represents The One or at least two of the -CH2- therein can be replaced by -O-, and one or at most two of the single bonds in the ring can be replaced by double bonds; the one or at least two -H therein may be replaced by -F, -Cl, -CN, -CH3 or -OCH3, and -CH= in one or at least two rings may be replaced by -N=; Z1 and Z2 each independently represent a single bond, -O-, -S-, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, -CF2CF2-, -(CH2)4-, -CF2O- or -OCF2-; Z3 represents a single bond, -O(CH2) a - or -S(CH2) a -; a represents an integer from 0 to 5; L1 and L2 each independently represent -H, a halogen, a halogenated or unhalogenated alkyl group having 1 to 3 carbon atoms, or a halogenated or unhalogenated alkoxy group having 1 to 3 carbon atoms; G represents -O-, -S-, -CO-, -CF2-, -NH- or -NF-; X represents -H, -OH, -O*, a straight-chain or branched alkyl group having 1 to 5 carbon atoms; one or at least two non-adjacent -CH2- in the straight-chain or branched alkyl group having 1 to 5 carbon atoms may be independently replaced by -O- or -CO- respectively; -O* represents an oxygen radical; n1 represents 0 or 1; n2 represents 0, 1, or 2; when n2 = 2, the ring the same or different, Z2 is the same or different; n represents an integer from 1 to 20.

2. The liquid crystal composition according to claim 1, wherein The compound of formula I is selected from the group consisting of the following compounds: and Wherein, R1, R2 and Z3 have the same defined ranges as in Formula I; Y1 and Y2 each independently represent -O- or -CH2-.

3. The liquid crystal composition according to claim 1, wherein The mass percentage content of the compound of Formula I in the liquid crystal composition is 1% - 30%.

4. The liquid crystal composition according to claim 1, wherein The X represents -H, -OH, -O*, a straight-chain or branched alkyl group having 1 to 5 carbon atoms, a straight-chain or branched alkoxy group having 1 to 5 carbon atoms, or a straight-chain or branched acyl group having 1 to 5 carbon atoms.

5. The liquid crystal composition according to claim 1, wherein, The mass percentage content of the stabilizer in the liquid crystal composition is 0.001% - 0.1%.

6. The liquid crystal composition according to claim 1, wherein The liquid crystal composition further comprises at least one compound of formula N: wherein, R N1 and R N2 each independently represents a straight-chain or branched-chain alkyl group having 1 to 12 carbon atoms, One or at least two non-adjacent -CH2- in the straight-chain or branched alkyl group having 1 to 12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO- respectively; Ring Sum ring Each independently represents Among them One or at least two of the -CH2- therein may be replaced by -O-, and one or at most two of the single bonds in the ring may be replaced by double bonds, wherein One or at least two -H therein may be independently replaced by -F, -Cl or -CN respectively, and -CH= in one or at least two rings may be replaced by -N=; L N1 and L N2 each independently represents -H, a halogen, a straight-chain or branched alkyl group having 1 to 3 carbon atoms, or a straight-chain or branched alkoxy group having 1 to 3 carbon atoms; Z N1 and Z N2 each independently represents a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH═CH-, -C≡C-, -CH2CH2-, -CF2CF2-, -(CH2)4-, -CF2O- or -OCF2-; n N1 represents 0, 1, 2, or 3, where n N2 represents 0 or 1, and 0 ≤ n N1 + n N2 ≤ 3; When n N1 represents 2 or 3, the ring Same or different, Z N1 Same or different.

7. The liquid crystal composition according to claim 6, wherein The compound of formula N is selected from the group consisting of the following compounds: and wherein, R N1 and R N2 have the same defined scope as in formula N.

8. The liquid crystal composition according to claim 1, wherein The liquid crystal composition further comprises at least one compound of formula M: wherein, R M1 and R M2 each independently represents a straight-chain or branched-chain alkyl group having 1 to 12 carbon atoms, One or at least two non-adjacent -CH2- in the straight-chain or branched alkyl group having 1 to 12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO- respectively; Ring Ring Sum ring Each independently represents The said One or at least two of the -CH2- therein may be replaced by -O-, and one or at most two single bonds in the ring may be replaced by double bonds; the At most one -H therein may be replaced by a halogen; Z M1 and Z M2 each independently represents a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -CH2CH2- or -(CH2)4-; n M1 represents 0, 1, 2, or 3, where when n M1 = 2 or 3, the ring Same or different, Z M2 Same or different.

9. The liquid crystal composition according to claim 8, wherein The compound of formula M is selected from the group consisting of the following compounds: and Wherein, R M1 and R M2 each independently represents a straight-chain or branched alkyl group having 1 to 10 carbon atoms, and one or two or more non-adjacent -CH2- in the straight-chain or branched alkyl group having 1 to 10 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO- respectively.

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

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