TWI738093B - Liquid crystal composition and its display device - Google Patents

Abstract

The present invention provides a liquid crystal composition comprising: at least one compound of general formula I; at least one compound of general formula II; at least one compound of general formula III; and at least one compound of general formula M. The present invention also provides a display device containing the liquid crystal composition. The liquid crystal composition provided by the present invention has high dielectric anisotropy, suitably high optical anisotropy, suitably high clearing point, high transmittance, high transmittance, good low temperature stability, and large The average elastic constant enables the liquid crystal display device containing the liquid crystal composition of the present invention to have higher contrast, relatively little light scattering, and good display effects.

Description

Liquid crystal composition and its display device

The invention relates to the field of liquid crystal materials, in particular to a liquid crystal composition and a display device thereof.

The liquid crystal material is a mixture of organic rod-shaped small molecule compounds that have both liquid fluidity and crystal anisotropy at a certain temperature. Liquid crystal display devices use the optical anisotropy and dielectric anisotropy of the liquid crystal material itself to work, and have been widely used at present. The classification of liquid crystal display elements based on the operation mode of liquid crystal molecules is: phase change (PC), twisted nematic (TN), super twisted nematic (STN), dynamic scattering (dynamic scattering, DS), ferroelectric liquid crystal (FLC), guest-host (GH), electrically controlled birefringence (ECB), optically compensated bend (OCB), coplanar switching Modes such as in-plane switching (IPS), vertical alignment (VA), fringe field switching (FFS), and field-induced photo-reactive alignment (FPA).

Liquid Crystal Display (LCD) has been developed rapidly due to its small size, light weight, low power consumption and excellent display quality, and is particularly widely used in portable electronic information products. With the increase in the size of LCD screens used in portable computers, office applications, and video applications, in order to enable LCD monitors to be used for large-screen displays and eventually replace cathode ray tubes (Cathode Ray Tube, CRT), there are still some to be resolved Problems such as improving viewing angle characteristics, increasing response speed, increasing contrast, and increasing transmittance. The narrow viewing angle of LCD means that when viewed away from the direction perpendicular to the normal line of the liquid crystal cell, the contrast is significantly reduced, and when the viewing angle is large, grayscale and color inversion will occur, which seriously affects the display quality of the LCD.

The viewing angle of the LCD is determined by the working principle of the liquid crystal. The liquid crystal molecules themselves are rod-shaped, and different molecular arrangements correspond to different optical anisotropies. The smaller the angle between the incident light and the liquid crystal molecules, the smaller the birefringence; on the contrary, the larger the birefringence. The angle between the light incident on the liquid crystal cell and the director of the liquid crystal molecules at different angles deviating from the normal direction of the display screen is different, so that the effective optical path difference Δn*d is different under different viewing angles. However, the optimal optical path difference of the liquid crystal cell is designed according to the direction perpendicular to the normal line of the liquid crystal cell. For obliquely incident light, the minimum transmittance increases with the increase of the included angle, and the contrast will decrease. When the included angle is large enough At times, the contrast may even be reversed.

At present, many methods to solve the viewing angle problem have been proposed, such as: optically compensated bend (OCB) mode, in-plane switching (IPS) mode, fringe field switching (FFS) Mode and multi-vertical alignment (multi-vertical alignment, MVA) mode, etc. They have their own advantages and disadvantages: MVA mode has the characteristics of high contrast and fast response, but it requires a biaxial compensation film and two elliptical polarizers, so the cost is high; OCB mode is difficult to maintain stable control with AC voltage , The transmittance of the three monochromatic lights of R, G, and B is different. In addition, in the absence of a field, the molecules in the liquid crystal cell are arranged in a direction parallel to the substrate. In order to achieve a curved arrangement, it needs to be on the cell Add a few seconds of voltage to preset, and then you can maintain this arrangement at a lower voltage, which brings inconvenience to use; IPS mode only needs linear polarizers and no compensation film, but its response speed is too slow. Cannot display fast moving pictures. Since the IPS mode and the FFS mode are simple to make and have a wide viewing angle, they have become the most attractive way to improve the viewing angle characteristics and realize a large area display.

In the early 1970s, the basic electro-optical characteristics of the uniformly arranged and twisted nematic liquid crystal IPS mode have been experimentally studied. The characteristic is that a pair of electrodes are fabricated on the same substrate and the other substrate Without electrodes, the arrangement of liquid crystal molecules is controlled by the lateral electric field applied between the pair of electrodes. Therefore, this mode can also be called a lateral field mode. In the IPS mode, the nematic liquid crystal molecules are uniformly arranged in parallel between the two substrates, and the two polarizers are placed orthogonally. In the IPS mode, when an electric field is not applied, the incident light is blocked by two orthogonal polarizers and becomes a dark state. When an electric field is applied, the liquid crystal molecules rotate and cause delay, so light leaks from the two orthogonal polarizers. The advantages of the IPS mode panel are large viewing angle and accurate color reproduction, but the disadvantages are serious light leakage, slow response speed, and high energy consumption.

With the wide application of TFT LCD, its performance requirements are constantly improving. High display image quality requires faster response speed, lower energy consumption, and higher low-temperature reliability. In addition, Higher contrast and transmittance are required, especially for IPS-type liquid crystal display modes. This means that liquid crystal materials need to have higher contrast and transmittance, higher elastic coefficient, higher dielectric constant and low-temperature reliability, and the improvement of these properties requires improvement of liquid crystal materials.

（其中，χ即為液晶層光軸與偏光片光軸之間的夾角，Δn為光學各向異性，d為盒間距，λ為波長）可知，有效Δn*d會影響T，若要提高正性液晶的透過率，也可以考慮增大Δn*d，但每款產品的延遲量設計都是固定的。According to the transmittance formula of IPS mode Transmittance (transmittance, T) ∝|Δε|/ε _⊥ ("∝" means "inverse proportional" relationship, ε _⊥ means the dielectric constant perpendicular to the molecular axis), if you want to increase the liquid crystal Transmittance, you can try to reduce the Δε of the liquid crystal medium, but generally the adjustment range of the driving voltage of the same product is limited. In addition, the liquid crystal molecules will tilt to the Z axis under the action of the vertical component of the fringe electric field, which will cause their optical anisotropy Δn to change. According to the formula

(Where χ is the angle between the optical axis of the liquid crystal layer and the optical axis of the polarizer, Δn is the optical anisotropy, d is the cell spacing, and λ is the wavelength) It can be seen that the effective Δn*d will affect T. The transmittance of sexual liquid crystal can also be considered to increase Δn*d, but the retardation design of each product is fixed.

圖一 傳統IPS-LCD的漏光因素測試On the other hand, based on the traditional IPS-LCD light leakage test, those skilled in the art found that the main factors causing the light leakage problem of liquid crystal display devices are: LC scattering, rubbing uniformity, and color filter film leakage. (CF/TFT scattering) and polarization ability, as shown in Figure 1, where light scattering accounts for 63% of the influencing factors of light leakage.

Figure 1. Light leakage factor test of traditional IPS-LCD

若要改善液晶材料的光散射，需要通過提高平均彈性常數K_ave （其中，

）來改善光散射；在提高K_ave 的情況下，可以降低液晶材料的漏光。According to the following relationship:

To improve the light scattering of liquid crystal materials, it is necessary to increase the average elastic constant K _ave (wherein,

) To improve light scattering; in _{the case of increasing K ave} , the light leakage of the liquid crystal material can be reduced.

In addition, the relationship between contrast (CR) and brightness (L) is as follows: CR=L ₂₅₅ /L ₀ ×100%, where L ₂₅₅ is the on-state brightness, and L ₀ is the off-state brightness. It can be seen that it should be the change _{of L 0 that significantly affects CR.} In the off state, L ₀ has nothing to do with the dielectric of the liquid crystal molecules, but is related to the light scattering (LC scattering) of the liquid crystal material itself. The smaller the light scattering (LC scattering), the smaller the L ₀ , and thus the contrast ratio (CR) will also be reduced. Significantly improved.

Given the above, a common way to increase the transmittance of the liquid crystal material can be considered from the following two aspects: (1) holding the liquid crystal composition of the same dielectric anisotropy Δε, the transmittance can be effectively improved by increasing the ε _⊥ (2) Increase the value of the average elastic constant K _ave of the liquid crystal composition, so that the order of the liquid crystal molecules is better, the light leakage is less, and the transmittance is improved. In view of some shortcomings of current liquid crystal compositions, the present invention provides a liquid crystal composition with good performance, especially a liquid crystal composition with higher transmittance, higher elastic constant, and good low-temperature stability.

Object of the invention: The object of the present invention is to provide a device with high dielectric anisotropy, appropriately high optical anisotropy, appropriately high clearing point, high transmittance, high transmittance, good low temperature stability, and Larger K _ave liquid crystal composition. The object of the present invention is also to provide a liquid crystal display device including the liquid crystal composition.

Ⅰ； 至少一種通式Ⅱ的化合物

Ⅱ； 至少一種通式Ⅲ的化合物

Ⅲ；以及 至少一種通式M的化合物

M， 其中， R₁ 和R_A2 各自獨立地表示含有1-12個碳原子的直鏈或支鏈的烷基、

、

或

，所述含有1-12個碳原子的直鏈或支鏈的烷基中的1個或不相鄰的2個以上的-CH₂ -可分別獨立地被-C=C-、-C≡C-、-O-、-CO-、-CO-O-或-O-CO-替代，並且所述含有1-12個碳原子的直鏈或支鏈的烷基、

、

或

中的一個或更多個-H可分別獨立地被-F或-Cl取代； R₂ 和R₃ 各自獨立地表示含有1-12個碳原子的直鏈或支鏈的烷基、含有2-12個碳原子的直鏈或支鏈的烯基，所述含有1-12個碳原子的直鏈或支鏈的烷基中的1個或不相鄰的2個以上的-CH₂ -可分別獨立地被-C≡C-、-O-、-CO-、-CO-O-或-O-CO-替代，並且所述含有1-12個碳原子的直鏈或支鏈的烷基中的一個或更多個-H可分別獨立地被-F或-Cl取代； R_M1 和R_M2 各自獨立地表示-H、含有1-12個碳原子的直鏈或支鏈的烷基、含有2-12個碳原子的直鏈或支鏈的烯基、

、

或

，所述含有1-12個碳原子的直鏈或支鏈的烷基中的1個或不相鄰的2個以上的-CH₂ -可分別獨立地被-C≡C-、-O-、-CO-、-CO-O-或-O-CO-替代； 環

、環

、環

和環

各自獨立地表示

或

，其中，

中一個或更多個-CH₂ -可被-O-替代，一個或更多個環中單鍵可被雙鍵替代，

中的一個或更多個-H可被-CN、-F或-Cl取代，一個或更多個環中-CH=可被-N=替代； 環

、環

和環

各自獨立地表示

或

，其中

中的一個或更多個-CH₂ -可被-O-替代，

中的至多一個-H可被鹵素取代； Z₁ 、Z₂ 和Z₃ 各自獨立地表示單鍵、-CH₂ CH₂ -、-CF₂ CF₂ -、-CF₂ O-、-OCF₂ -、-CO-O-、-O-CO-、-O-CO-O-、-CH＝CH-、-CF＝CF-、-CH₂ O-或-OCH₂ -； Z_A21 和Z_A22 各自獨立地表示單鍵、-CH₂ CH₂ -、-CF₂ CF₂ -、-CO-O-、-O-CO-、-O-CO-O-、-CH＝CH-、-CF＝CF-、-CH₂ O-或-OCH₂ -； Z_M1 和Z_M2 各自獨立地表示單鍵、-CO-O-、-O-CO-、-CH₂ O-、-OCH₂ -、-CH＝CH-、-C≡C-、-CH₂ CH₂ -或-(CH₂ )₄ -； L₁ 、L₂ 、L₃ 、L₄ 、L_A21 、L_A22 、L_A23 和L_A24 各自獨立地表示-H、含有1-3個碳原子的烷基、或鹵素； X表示鹵素、含有1-5個碳原子的鹵代烷基或鹵代烷氧基、含有2-5個碳原子的鹵代烯基或鹵代烯氧基； X_A2 表示鹵素、含有1-5個碳原子的鹵代烷基或鹵代烷氧基、含有2-5個碳原子的鹵代烯基或鹵代烯氧基； n1和n2各自獨立地表示0、1或2，且0≤n1+n2≤3，且當n1=2時，環

可以相同或不同，Z₁ 可以相同或不同，當n2=2時，環

可以相同或不同，Z₂ 可以相同或不同；並且 n_A2 表示0、1、2或3，且當n_A2 =2或3時，環

可以相同或不同，Z_A21 可以相同或不同； n_M1 表示0、1、2或3，且當n_M1 =2或3時，環

可以相同或不同，Z_M2 可以相同或不同； 當Z_M1 和Z_M2 表示單鍵，n_M1 表示0，環

和環

不同時表示為

； 當Z₁ 、Z₂ 和Z₃ 各自獨立地表示單鍵、-CH₂ CH₂ -、-CF₂ CF₂ -、-CO-O-、-O-CO-、-O-CO-O-、-CH＝CH-、-CF＝CF-、-CH₂ O-或-OCH₂ -時，2≤n1+n2≤3；並且 當環

和環

中之一表示

時，n_A2 表示1。 Technical scheme of the present invention: In order to achieve the above-mentioned object of the present invention, the present invention provides a liquid crystal composition, which comprises: at least one compound of general formula I

Ⅰ; at least one compound of general formula II

Ⅱ; at least one compound of general formula Ⅲ

Ⅲ; and at least one compound of general formula M

M, where R ₁ and R _A2 each independently represent a linear or branched alkyl group containing 1-12 carbon atoms,

,

or

_{, One or two or more non-adjacent -CH 2} -in the linear or branched alkyl group containing 1-12 carbon atoms can be independently controlled by -C=C-, -C≡ C-, -O-, -CO-, -CO-O- or -O-CO- substitution, and the linear or branched alkyl group containing 1-12 carbon atoms,

,

or

One or more of -H may be independently substituted by -F or -Cl; R ₂ and R ₃ each independently represent a linear or branched alkyl group containing 1-12 carbon atoms, containing 2- A straight-chain or branched alkenyl group with 12 carbon atoms, one of the straight-chain or branched-chain alkyl group containing 1-12 carbon atoms or two or more non-adjacent -CH ₂ -may Are independently replaced by -C≡C-, -O-, -CO-, -CO-O- or -O-CO-, and the linear or branched alkyl group containing 1-12 carbon atoms One or more of -H may be independently substituted by -F or -Cl; R _M1 and R _M2 each independently represent -H, a linear or branched alkyl group containing 1-12 carbon atoms, Containing 2-12 carbon atoms linear or branched alkenyl,

,

or

_{, One or two or more non-adjacent -CH 2} -in the linear or branched alkyl group containing 1-12 carbon atoms can be independently replaced by -C≡C-, -O- , -CO-, -CO-O- or -O-CO- substitution; ring

,ring

,ring

And ring

Expressed independently of each other

or

,in,

One or more -CH ₂ -can be replaced by -O-, one or more single bonds in the ring can be replaced by double bonds,

One or more of -H can be replaced by -CN, -F or -Cl, and -CH= can be replaced by -N= in one or more rings; ring

,ring

And ring

Expressed independently of each other

or

,in

One or more of -CH ₂ -can be replaced by -O-,

At most one of -H may be substituted by halogen; Z ₁ , Z ₂ and Z ₃ each independently represent a single bond, -CH ₂ CH ₂ -, -CF ₂ CF ₂ -, -CF ₂ O-, -OCF _2- , -CO-O-, -O-CO-, -O-CO-O-, -CH=CH-, -CF=CF-, -CH ₂ O- or -OCH ₂ -; Z _A21 and Z _A22 each Independently represent 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 -; Z _M1 and Z _M2 each independently represent a single bond, -CO-O-, -O-CO-, -CH ₂ O-, -OCH ₂ -, -CH =CH-, -C≡C-, -CH ₂ CH ₂ -or -(CH ₂ ) ₄ -; L ₁ , L ₂ , L ₃ , L ₄ , L _A21 , L _A22 , L _A23 and L _A24 are independent of each other Ground represents -H, an alkyl group containing 1-3 carbon atoms, or halogen; X represents halogen, a haloalkyl group or a halogenated alkoxy group containing 1-5 carbon atoms, and a haloalkenyl group containing 2-5 carbon atoms Or haloalkenyloxy; X _A2 represents halogen, haloalkyl or haloalkoxy containing 1-5 carbon atoms, haloalkenyl or haloalkenyloxy containing 2-5 carbon atoms; n1 and n2 are each Independently represents 0, 1, or 2, and 0≤n1+n2≤3, and when n1=2, the ring

Can be the same or different, Z ₁ can be the same or different, when n2=2, the ring

Can be the same or different, Z ₂ can be the same or different; and n _A2 represents 0, 1, 2 or 3, and when n _A2 = 2 or 3, the ring

Can be the same or different, Z _A21 can be the same or different; n _M1 represents 0, 1, 2 or 3, and when n _M1 = 2 or 3, the ring

Can be the same or different, Z _M2 can be the same or different; when Z _M1 and Z _M2 represent a single bond, n _M1 represents 0, the ring

And ring

Not at the same time expressed as

; When Z ₁ , Z ₂ and Z ₃ each independently represent 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 -, 2≤n1+n2≤3; and when the ring

And ring

One of them means

When, n _A2 means 1.

In some embodiments of the present invention, the dielectric anisotropy of the compound of general formula I and the compound of general formula II are both positive.

In some embodiments of the present invention, the absolute value of the dielectric anisotropy of the compound of formula II is not less than 4.

In some embodiments of the present invention, the absolute value of the dielectric anisotropy of the compound of general formula M does not exceed 3; preferably, the absolute value of the dielectric anisotropy of the compound of general formula M does not exceed 2.

In some embodiments of the present invention, the content of the compound of general formula I must be based on solubility at low temperature, transition temperature, electrical reliability, transmittance, contrast, birefringence, process adaptability, drip marks, burn-in , Dielectric anisotropy and other required properties are appropriately adjusted.

Regarding the preferred weight percentage of the compound of the general formula I in the liquid crystal composition of the present invention: relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of the general formula I in the liquid crystal composition of the present invention Values are 0.1%, 0.5%, 1%, 2%, 3%, 4%, 5%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 20%, 30% or 40%; relative to the total weight of the liquid crystal composition of the present invention, the preferred upper limit of the weight percentage of the compound of formula I in the liquid crystal composition of the present invention is 60%, 55%, 50% , 45%, 40%, 35%, 30%, 28%, 27%, 26%, 25.5%, 25%, 24.5%, 24%, 22%, 20%, 18%, 16% or 15%.

In some embodiments of the present invention, the compound of formula I accounts for 0.1%-60% by weight of the liquid crystal composition.

In some embodiments of the present invention, in the compound of formula I, when n1=0, _{at least one of Z 2} and Z ₃ is not a single bond; when n1=1 and n2=1, Z ₁ , Z ₂ and Z ₃ each independently represent 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 -; when n1=1 and n2=0, _{at least one of Z 1} and Z ₃ is not a single bond.

In some embodiments of the present invention, in the compound of general formula I, R ₁ is preferably a linear or branched alkyl or alkoxy group containing 1-8 carbon atoms, and a group containing 2-8 carbon atoms. Straight-chain or branched alkenyl or alkenyloxy; further preferably straight-chain or branched alkyl or alkoxy containing 1-5 carbon atoms, straight-chain or branched-chain containing 2-5 carbon atoms的alkenyl or alkenyloxy.

和環

各自獨立地表示

、

、

、

、

、

、

、

、

、

、

、

、

、

、

、

、

或

。In some embodiments of the invention, the ring

And ring

Expressed independently of each other

,

,

,

,

,

,

,

,

,

,

,

,

,

,

,

,

or

.

In some embodiments of the present invention, L ₁ , L ₂ , L ₃ and L ₄ each independently represent -H, -CH ₃ , -F or -Cl.

Ⅰ-1；

Ⅰ-2；

Ⅰ-3；

Ⅰ-4；

Ⅰ-5；

Ⅰ-6；

Ⅰ-7；

Ⅰ-8；

Ⅰ-9；

Ⅰ-10；

Ⅰ-11；以及

Ⅰ-12， 其中， L₅ 、L₆ 和L₇ 各自獨立地表示-H或-F； R_x 和R_y 各自獨立地表示-CH₂ -或-O-；並且 n1表示0或1。In some embodiments of the present invention, the compound of general formula I is selected from the group consisting of the following compounds:

Ⅰ-1;

Ⅰ-2;

Ⅰ-3;

Ⅰ-4;

Ⅰ-5;

Ⅰ-6;

Ⅰ-7;

Ⅰ-8;

Ⅰ-9;

Ⅰ-10;

Ⅰ-11; and

I-12, where L ₅ , L ₆ and L ₇ each independently represent -H or -F; R _x and R _y each independently represent -CH ₂ -or -O-; and n1 represents 0 or 1.

In some embodiments of the present invention, the liquid crystal composition of the present invention preferably contains at least one compound of general formula I; more preferably contains at least one compound of general formula I-1~I-9 and general formula I-11; further preferably Containing 2 to 10 compounds of general formula I-1~I-9 and general formula I-11.

In some embodiments of the present invention, the liquid crystal composition of the present invention preferably contains at least one compound of general formula I; more preferably contains at least one compound of general formula I-1 to I-8 and general formula I-9; further preferably Containing 2 to 10 compounds of general formula I-1 to I-8 and general formula I-9.

In some embodiments of the present invention, the liquid crystal composition of the present invention preferably contains at least one compound of general formula I; more preferably, it contains at least two compounds of general formula I-1 to I-8 and general formula I-9.

In some embodiments of the present invention, the liquid crystal composition of the present invention preferably contains at least one compound of general formula I; more preferably, it contains at least two compounds of general formula I-1 to I-8.

Ⅰ-1-1；

Ⅰ-1-2；

Ⅰ-1-3；

Ⅰ-1-4；

Ⅰ-1-5；

Ⅰ-1-6；

Ⅰ-1-7；

Ⅰ-1-8；

Ⅰ-1-9；

Ⅰ-1-10；

Ⅰ-2-1；

Ⅰ-2-2；

Ⅰ-2-3；

Ⅰ-2-4；

Ⅰ-2-5；

Ⅰ-2-6；

Ⅰ-2-7；

Ⅰ-2-8；

Ⅰ-2-9；

Ⅰ-2-10；

Ⅰ-3-1；

Ⅰ-3-2；

Ⅰ-3-3；

Ⅰ-3-4；

Ⅰ-3-5；

Ⅰ-3-6；

Ⅰ-3-7；

Ⅰ-3-8；

Ⅰ-3-9；

Ⅰ-3-10；

Ⅰ-4-1；

Ⅰ-4-2；

Ⅰ-4-3；

Ⅰ-4-4；

Ⅰ-4-5；

Ⅰ-4-6；

Ⅰ-4-7；

Ⅰ-4-8；

Ⅰ-4-9；

Ⅰ-4-10；

Ⅰ-5-1；

Ⅰ-5-2；

Ⅰ-5-3；

Ⅰ-5-4；

Ⅰ-5-5；

Ⅰ-5-6；

Ⅰ-5-7；

Ⅰ-5-8；

Ⅰ-5-9；

Ⅰ-5-10；

Ⅰ-6-1；

Ⅰ-6-2；

Ⅰ-6-3；

Ⅰ-6-4；

Ⅰ-6-5；

Ⅰ-6-6；

Ⅰ-6-7；

Ⅰ-6-8；

Ⅰ-6-9；

Ⅰ-6-10；

Ⅰ-7-1；

Ⅰ-7-2；

Ⅰ-7-3；

Ⅰ-7-4；

Ⅰ-7-5；

Ⅰ-7-6；

Ⅰ-7-7；

Ⅰ-7-8；

Ⅰ-7-9；

Ⅰ-7-10；

Ⅰ-8-1；

Ⅰ-8-2；

Ⅰ-8-3；

Ⅰ-8-4；

Ⅰ-8-5；

Ⅰ-8-6；

Ⅰ-8-7；

Ⅰ-8-8；

Ⅰ-8-9；

Ⅰ-8-10；

Ⅰ-9-1；

Ⅰ-10-1；

Ⅰ-10-2；

Ⅰ-11-1；

Ⅰ-12-1；以及

Ⅰ-12-2。In some embodiments of the present invention, the compounds of general formula I-1 to general formula I-12 are preferably selected from the group consisting of the following compounds:

Ⅰ-1-1;

Ⅰ-1-2;

Ⅰ-1-3;

Ⅰ-1-4;

Ⅰ-1-5;

Ⅰ-1-6;

Ⅰ-1-7;

Ⅰ-1-8;

Ⅰ-1-9;

Ⅰ-1-10;

Ⅰ-2-1;

Ⅰ-2-2;

Ⅰ-2-3;

Ⅰ-2-4;

Ⅰ-2-5;

Ⅰ-2-6;

Ⅰ-2-7;

Ⅰ-2-8;

Ⅰ-2-9;

Ⅰ-2-10;

Ⅰ-3-1;

Ⅰ-3-2;

Ⅰ-3-3;

Ⅰ-3-4;

Ⅰ-3-5;

Ⅰ-3-6;

Ⅰ-3-7;

Ⅰ-3-8;

Ⅰ-3-9;

Ⅰ-3-10;

Ⅰ-4-1;

Ⅰ-4-2;

Ⅰ-4-3;

Ⅰ-4-4;

Ⅰ-4-5;

Ⅰ-4-6;

Ⅰ-4-7;

Ⅰ-4-8;

Ⅰ-4-9;

Ⅰ-4-10;

Ⅰ-5-1;

Ⅰ-5-2;

Ⅰ-5-3;

Ⅰ-5-4;

Ⅰ-5-5;

Ⅰ-5-6;

Ⅰ-5-7;

Ⅰ-5-8;

Ⅰ-5-9;

Ⅰ-5-10;

Ⅰ-6-1;

Ⅰ-6-2;

Ⅰ-6-3;

Ⅰ-6-4;

Ⅰ-6-5;

Ⅰ-6-6;

Ⅰ-6-7;

Ⅰ-6-8;

Ⅰ-6-9;

Ⅰ-6-10;

Ⅰ-7-1;

Ⅰ-7-2;

Ⅰ-7-3;

Ⅰ-7-4;

Ⅰ-7-5;

Ⅰ-7-6;

Ⅰ-7-7;

Ⅰ-7-8;

Ⅰ-7-9;

Ⅰ-7-10;

Ⅰ-8-1;

Ⅰ-8-2;

Ⅰ-8-3;

Ⅰ-8-4;

Ⅰ-8-5;

Ⅰ-8-6;

Ⅰ-8-7;

Ⅰ-8-8;

Ⅰ-8-9;

Ⅰ-8-10;

Ⅰ-9-1;

Ⅰ-10-1;

Ⅰ-10-2;

Ⅰ-11-1;

Ⅰ-12-1; and

Ⅰ-12-2.

In some embodiments of the present invention, the compound of general formula I is selected from general formula I-1-6, general formula I-6-6, general formula I-2-6, general formula I-8-9, general formula I-5-6 and the group consisting of compounds of general formula I-4-6.

In some embodiments of the present invention, Z _A21 and Z _A22 are each independently preferably a single bond, -CH ₂ CH ₂ -, -CO-O-, -CH ₂ O- or -CH=CH-.

In some embodiments of the present invention, X _A2 represents halogen, haloalkyl or haloalkoxy containing 1-5 carbon atoms, haloalkenyl or haloalkenyloxy containing 2-5 carbon atoms; preferably Represents -F, -Cl, -OCF ₃ , -OCH ₂ CF ₃ , -O-CH=CF ₂ or -CF ₃ ; particularly preferably represents -F, -OCF ₃ or -CF ₃ .

In some embodiments of the present invention, in the compound of general formula II, R _A2 is preferably a linear or branched alkyl or alkoxy group containing 1-8 carbon atoms, and a group containing 2-8 carbon atoms. Straight-chain or branched alkenyl or alkenyloxy; further preferably straight-chain or branched alkyl or alkoxy containing 1-5 carbon atoms, straight-chain or branched-chain containing 2-5 carbon atoms的alkenyl or alkenyloxy.

和環

各自獨立地表示

、

、

、

、

、

、

、

、

、

、

、

、

、

、

、

、

或

。In some embodiments of the invention, the ring

And ring

Expressed independently of each other

,

,

,

,

,

,

,

,

,

,

,

,

,

,

,

,

or

.

In some embodiments of the invention, L _A21 , L _A22 , L _A23 and L _A24 each independently represent -H, -CH ₃ , -F, or -Cl.

Ⅱ-1；

Ⅱ-2；

Ⅱ-3；

Ⅱ-4；

Ⅱ-5；

Ⅱ-6；

Ⅱ-7；

Ⅱ-8；

Ⅱ-9；

Ⅱ-10；

Ⅱ-11；

Ⅱ-12；

Ⅱ-13；

Ⅱ-14；

Ⅱ-15；

Ⅱ-16；

Ⅱ-17；

Ⅱ-18；

Ⅱ-19；

Ⅱ-20；

Ⅱ-21；

Ⅱ-22；

Ⅱ-23；

Ⅱ-24；

Ⅱ-25；

Ⅱ-26；

Ⅱ-27；

Ⅱ-28；

Ⅱ-29；

Ⅱ-30；

Ⅱ-31；

Ⅱ-32；

Ⅱ-33；

Ⅱ-34；

Ⅱ-35；

Ⅱ-36；

Ⅱ-37；

Ⅱ-38；

Ⅱ-39；

Ⅱ-40；

Ⅱ-41；

Ⅱ-42；

Ⅱ-43；以及

Ⅱ-44。In some embodiments of the present invention, the compound of general formula II is selected from the group consisting of the following compounds:

Ⅱ-1;

Ⅱ-2;

Ⅱ-3;

Ⅱ-4;

Ⅱ-5;

Ⅱ-6;

Ⅱ-7;

Ⅱ-8;

Ⅱ-9;

Ⅱ-10;

Ⅱ-11;

Ⅱ-12;

Ⅱ-13;

Ⅱ-14;

Ⅱ-15;

Ⅱ-16;

Ⅱ-17;

Ⅱ-18;

Ⅱ-19;

Ⅱ-20;

Ⅱ-21;

Ⅱ-22;

Ⅱ-23;

Ⅱ-24;

Ⅱ-25;

Ⅱ-26;

Ⅱ-27;

Ⅱ-28;

Ⅱ-29;

Ⅱ-30;

Ⅱ-31;

Ⅱ-32;

Ⅱ-33;

Ⅱ-34;

Ⅱ-35;

Ⅱ-36;

Ⅱ-37;

Ⅱ-38;

Ⅱ-39;

Ⅱ-40;

Ⅱ-41;

Ⅱ-42;

Ⅱ-43; and

Ⅱ-44.

In some embodiments of the present invention, the liquid crystal composition of the present invention preferably contains at least one compound of general formula II; more preferably at least one compound of general formula II-1~II-3, II-15~II-20, II- 24. Compounds of Ⅱ-26, Ⅱ-28~Ⅱ-44; further preferably containing 2 to 12 general formulas Ⅱ-1~Ⅱ-3, Ⅱ-15~Ⅱ-20, Ⅱ-24, Ⅱ-26, Compounds of Ⅱ-28~Ⅱ-44; more preferably containing 2 to 10 general formulas Ⅱ-1~Ⅱ-3, Ⅱ-15~Ⅱ-20, Ⅱ-24, Ⅱ-26, Ⅱ-28~Ⅱ -44 compounds; it is further preferred to contain 2 to 8 compounds of general formula II-1 to II-3, II-15 to II-20, II-24, II-26, II-28 to II-44.

In some embodiments of the present invention, the compound of general formula II is selected from general formula II-1, general formula II-2, general formula II-3, general formula II-5, general formula II-15, general formula II- 16. General formula II-17, general formula II-23, general formula II-24, general formula II-26, general formula II-27, general formula II-28, general formula II-29, general formula II-34 and The group consisting of compounds of general formula II-44.

Regarding the preferred weight percentage of the compound of the general formula II in the liquid crystal composition of the present invention: relative to the total weight of the composition of the present invention, the preferred lower limit of the weight percentage of the compound of the general formula II in the liquid crystal composition of the present invention Values are 0.1%, 0.5%, 1%, 3%, 5%, 10%, 13%, 14%, 15%, 18%, 20%, 23%, 25%, 28%, 30%, 33%, 35%, 38% or 40%; relative to the total weight of the composition of the present invention, the preferred upper limit of the weight percentage of the compound of general formula II in the liquid crystal composition of the present invention is 80%, 78%, 75% , 73%, 70%, 68%, 65%, 63%, 60%, 55%, 50%, 40%, 38%, 35%, 33%, 30%, 28%, 25%, 23%, 20 %, 18%, 15% or 10%.

In some embodiments of the present invention, the compound of formula II accounts for 0.1%-80% by weight of the liquid crystal composition.

In some embodiments of the present invention, when the viscosity of the liquid crystal composition of the present invention needs to be kept low and the response time is short, it is preferable that the lower limit of the content of the general formula II is slightly lower and the upper limit is slightly lower. Among them, the lower limit is preferably: 3%, 5%, 10%, 13%, 14%, 15%, 18%, 20%, 23%, 25%, 28%, 30%, 33%, 35%, 38% or 40%, and the upper limit is preferably: 70%, 68%, 65%, 63%, 60%, 55%, 50%, 40%, 38%, 35%, 33%, 30%, 28 %, 25%, 23% or 20%; further, when the clearing point of the liquid crystal composition of the present invention needs to be maintained high and the temperature stability is good, it is preferable that the lower limit of the content of the general formula II is slightly lower, and The upper limit is slightly lower, and the lower limit is preferably: 5%, 10%, 13%, 14%, 15%, 18%, 20%, 23%, 25%, 28%, 30%, 33%, 35%, 38 or, 40%, and the upper limit is preferably: 65%, 63%, 60%, 55%, 50%, 40%, 38%, 35%, 33%, 30%, 28% or 25 %. In addition, when increasing the dielectric anisotropy in order to keep the drive voltage low, it is preferable to increase the lower limit value and the upper limit value of the content of the general formula II. Among them, the lower limit value is preferably It is: 5%, 10%, 13%, 14%, 15%, 18%, 20%, 23%, 25%, 28% or 30%, and the upper limit is preferably: 55%, 50%, 40% , 38%, 35%, 33%, 30%, 28% or 25%.

In some embodiments of the present invention, the compound of formula III can effectively improve the contrast and low-temperature stability of the liquid crystal composition.

Ⅲ-a；

Ⅲ-b；

Ⅲ-c；

Ⅲ-d；

Ⅲ-e；

Ⅲ-f；以及

Ⅲ-g；以及

Ⅲ-h， 其中， R₂ 表示含有1-8個碳原子的直鏈或支鏈的烷基或烷氧基、或含有2-8個碳原子的直鏈或支鏈的烯基或烯氧基；並且 R₂₁ 和R₃₁ 各自獨立地表示含有1-8個碳原子的直鏈或支鏈的烷基或烷氧基。In some embodiments of the present invention, the compound of general formula III is selected from the group consisting of the following compounds:

Ⅲ-a;

Ⅲ-b;

Ⅲ-c;

Ⅲ-d;

Ⅲ-e;

Ⅲ-f; and

Ⅲ-g; and

Ⅲ-h, where R ₂ represents a straight-chain or branched alkyl group or alkoxy group containing 1-8 carbon atoms, or a straight-chain or branched chain alkenyl group or alkyloxy group containing 2-8 carbon atoms And R ₂₁ and R ₃₁ each independently represent a linear or branched alkyl group or alkoxy group containing 1-8 carbon atoms.

Regarding the weight percentage of the compound of general formula III in the liquid crystal composition of the present invention, the weight percentage of the compound of general formula III in the liquid crystal composition of the present invention is preferably lower than the total weight of the liquid crystal composition of the present invention. The limit is 0.1%, 1%, 2%, 3%, 5%, 7%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50% or 55% Relative to the total weight of the liquid crystal composition of the present invention, the preferred upper limit of the weight percentage of the compound of general formula III in the liquid crystal composition of the present invention is 70%, 65%, 60%, 55%, 50%, 45%, 40%, 35%, 30% or 25%.

In some embodiments of the present invention, the compound of formula III accounts for 0.1%-70% by weight of the liquid crystal composition.

In some embodiments of the present invention, the compound of general formula III is preferably selected from the group consisting of compounds of general formula III-a, general formula III-b, and general formula III-h.

In some embodiments of the present invention, the compound of general formula III is selected from the group consisting of compounds of general formula III-a and/or general formula III-b, and compounds of general formula III-h.

In some embodiments of the present invention, in terms of low-temperature storage stability, the group consisting of the compound of the general formula III-a and/or the general formula III-b, and the compound of the general formula III-h may include the group The liquid crystal composition has good low temperature stability.

In some embodiments of the present invention, R ₂ is preferably a linear or branched alkyl group containing 1 to 5 carbon atoms, or a linear or branched alkenyl group containing 2 to 5 carbon atoms; further preferred It is a linear or branched alkyl or alkenyl group containing 2 to 5 carbon atoms.

In some embodiments of the present invention, in order to particularly improve the response time, compounds in which R ₂ is ethyl or n-propyl in the compounds of the general formula III-a and III-b are particularly preferred.

Relative to the total weight of the liquid crystal composition of the _{present invention, the preferred lower limit of the weight percentage of the compound in which R 2} represents ethyl or n-propyl in the compound of general formula III-a accounts for 1% of the liquid crystal composition of the present invention , 5%, 10%, 15%, 17%, 20%, 23%, 25%, 27% or 30%; relative to the total weight of the composition of the present invention, R ₂ in the compound of general formula III-a represents The preferred upper limit of the weight percentage of the ethyl or n-propyl compound in the liquid crystal composition of the present invention is 60%, 55%, 50%, 45%, 42%, 40%, 38%, 35%, 33 %, 30%, 28% or 25%.

Relative to the total weight of the liquid crystal composition of the _{present invention, the preferred lower limit of the weight percentage of the compound in which R 2} represents n-propyl in the compound of general formula III-b accounts for the liquid crystal composition of the present invention is 0%, 1% , 2%, 3%, 5%, 7% or 10%; relative to the total weight of the liquid crystal composition of the present invention, in the compound of the general formula III-b, the compound whose R ₂ represents a n-propyl group accounts for the liquid crystal of the present invention The preferred upper limit of the weight percentage of the composition is 30%, 25%, 20%, 15%, 13%, 10%, 8%, 7%, 6%, 5% or 3%.

In some embodiments of the present invention, as far as the clearing point is concerned, when a higher clearing point needs to be obtained by the compound of general formula III, it is preferred that R ₂ in the compound of general formula III represents a butyl or pentyl group; further Preferably, in the compound of the general formula III, R ₂ represents n-butyl or n-pentyl.

Relative to the total weight of the liquid crystal composition of the present invention, the compound of the general formula III-a and/or general formula III-b in which R ₂ represents n-butyl or n-pentyl accounts for the weight of the liquid crystal composition of the present invention The preferred lower limit of the percentage is 1%, 3%, 5%, 8%, 10%, 15%, 17%, 20%, 23%, 25%, 27% or 30%; relative to the composition of the present invention The total weight of the compound of the general formula III-a and/or the general formula III-b, the _{preferred upper limit of the weight percentage of the compound in which R 2} represents n-butyl or n-pentyl in the liquid crystal composition of the present invention is 60 %, 55%, 50%, 45%, 42%, 40%, 38%, 35%, 33%, 30%, 28%, 25%, 23% or 20%.

Relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of general formula III-c in the liquid crystal composition of the present invention is 1%, 5%, 10%, 13%, 15% , 17% or 20%; relative to the total weight of the liquid crystal composition of the present invention, the preferred upper limit of the weight percentage of the compound of general formula III-c in the liquid crystal composition of the present invention is 25%, 23%, 20 %, 17%, 15%, 13% or 10%.

Relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of general formula III-d in the liquid crystal composition of the present invention is 1%, 5%, 10%, 13%, 15% , 17% or 20%; relative to the total weight of the liquid crystal composition of the present invention, the preferred upper limit of the weight percentage of the compound of general formula III-d in the liquid crystal composition of the present invention is 25%, 23%, 20 %, 17%, 15%, 13% or 10%.

Relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of the general formula III-e in the liquid crystal composition of the present invention is 1%, 5%, 10%, 13%, 15% , 17% or 20%; relative to the total weight of the liquid crystal composition of the present invention, the preferred upper limit of the weight percentage of the compound of general formula III-e in the liquid crystal composition of the present invention is 25%, 23%, 20 %, 17%, 15%, 13% or 10%.

Relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of the general formula III-f in the liquid crystal composition of the present invention is 1%, 5%, 10%, 13%, 15% , 17% or 20%; relative to the total weight of the liquid crystal composition of the present invention, the preferred upper limit of the weight percentage of the compound of general formula III-f in the liquid crystal composition of the present invention is 25%, 23%, 20 %, 17%, 15%, 13% or 10%.

Relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of general formula III-g in the liquid crystal composition of the present invention is 1%, 5%, 10%, 13%, 15% , 17% or 20%; relative to the total weight of the liquid crystal composition of the present invention, the preferred upper limit of the weight percentage of the compound of general formula III-g in the liquid crystal composition of the present invention is 25%, 23%, 20 %, 17%, 15%, 13% or 10%.

In some embodiments of the present invention, compounds in which R ₂ is n-propyl in the compounds of Formula III-f and/or Formula III-g are preferred.

Relative to the total weight of the liquid crystal composition of the present invention, in the compounds of general formula III-f and/or general formula III-g, _{the weight percentage of the compound in which R 2} is n-propyl is preferably lower than the weight percentage of the liquid crystal composition of the present invention. The limit is 1%, 2%, 3%, 5%, 7%, 10%, 13%, 15%, 18% or 20%; relative to the total weight of the liquid crystal composition of the present invention, the general formula III-f _{And/or the preferred upper limit of the weight percentage of the compound whose R 2} is n-propyl in the compound of general formula III-g in the liquid crystal composition of the present invention is 20%, 17%, 15%, 13%, 10% , 8%, 7% or 6%.

_{In some embodiments of the present invention, R 21} and R ₃₁ in the compound of the general formula III-h each independently represent a linear or branched alkyl or alkoxy group containing 1 to 7 carbon atoms, more preferably A straight or branched alkyl or alkoxy group containing 1 to 5 carbon atoms.

Relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of general formula III-h in the liquid crystal composition of the present invention is 1%, 3%, 5%, 7%, 10% , 13%, 15%, 17%, 20%, 23%, 25% or 30%; relative to the total weight of the liquid crystal composition of the present invention, the compound of the general formula III-h accounts for the total weight of the liquid crystal composition of the present invention The preferred upper limit of the weight percentage is 60%, 55%, 50%, 45%, 40%, 37%, 35%, 33%, 30%, 27%, 25%, 23%, 20%, 17%, 15%, 13% or 10%.

In some embodiments of the present invention, in order to particularly improve the response time of the liquid crystal composition of the present invention, it is preferred that R ₂₁ in the compound of general formula III-h is ethyl, n-propyl, butyl or pentyl, and R ₃₁ The compound is a methyl group or a methoxy group. In the compound of the general formula III-h, R ₂₁ is an ethyl, n-propyl, butyl or pentyl group, and R ₃₁ is an ethyl or ethoxy compound, or a compound of the general formula In the compound of III-h, R ₂₁ is n-propyl, butyl or pentyl, and R ₃₁ is n-propyl or propoxy.

Relative to the total weight of the liquid crystal composition of the present invention, in the compound of general formula III-h, R ₂₁ is ethyl, n-propyl, butyl or pentyl, and R ₃₁ is methyl or methoxy. The preferred lower limit of the weight percentage of the liquid crystal composition of the present invention is 0%, 1%, 2%, 3%, 5%, 7%, 10%, 13%, 15%, 18% or 20%; The total weight of the liquid crystal composition of the present invention. Among the compounds of the general formula III-h, the compounds in which R ₂₁ is ethyl, n-propyl, butyl or pentyl, and R ₃₁ is methyl or methoxy account for the present invention The preferred upper limit of the weight percentage of the liquid crystal composition is 20%, 17%, 15%, 13%, 10%, 8%, 7% or 6%.

Relative to the total weight of the liquid crystal composition of the present invention, in the compound of general formula III-h, R ₂₁ is ethyl, n-propyl, butyl or pentyl, and R ₃₁ is ethyl or ethoxy. The preferred lower limit of the weight percentage of the liquid crystal composition of the present invention is 0%, 1%, 2%, 3%, 5%, 7%, 10%, 13%, 15%, 18% or 20%; The total weight of the liquid crystal composition of the present invention. Among the compounds of the general formula III-h, the compounds in which R ₂₁ is ethyl, n-propyl, butyl or pentyl, and R ₃₁ is ethyl or ethoxy account for the present invention The preferred upper limit of the weight percentage of the liquid crystal composition is 20%, 17%, 15%, 13%, 10%, 8%, 7% or 6%.

Relative to the total weight of the liquid crystal composition of the present invention, the compounds of the general formula III-h in which R ₂₁ is n-propyl, butyl or pentyl, and R ₃₁ is n-propyl or propoxy account for the present invention The preferred lower limit of the weight percentage of the liquid crystal composition is 0%, 1%, 2%, 3%, 5%, 7%, 10%, 13%, 15%, 18% or 20%; relative to the present invention The total weight of the liquid crystal composition, in the compound of general formula III-h, the compound in which R ₂₁ is n-propyl, butyl or pentyl, and R ₃₁ is n-propyl or propoxy accounts for the liquid crystal composition of the present invention The preferred upper limit of the weight percentage of is 20%, 17%, 15%, 13%, 10%, 8%, 7% or 6%.

In some embodiments of the present invention, in the compound of the general formula M, R _M1 and R _{M2 are} preferably linear or branched alkyl groups containing 1 to 10 carbon atoms, and straight or branched chain alkyl groups containing 1 to 9 carbon atoms. A chain or branched alkoxy group, or a straight chain or branched alkenyl group containing 2 to 10 carbon atoms; more preferably a straight chain or branched chain alkyl group containing 1 to 8 carbon atoms, containing 1 to A straight-chain or branched alkoxy group with 7 carbon atoms, or a straight-chain or branched alkenyl group with 2 to 8 carbon atoms; still more preferably a straight-chain or branched chain with 1 to 5 carbon atoms The alkyl group, the straight-chain or branched alkoxy group containing 1 to 4 carbon atoms, or the straight-chain or branched chain alkenyl group containing 2 to 5 carbon atoms.

In some embodiments of the present invention, preferably, _{one or both of R M1} and R _M2 are linear or branched alkenyl groups containing 2 to 8 carbon atoms; further preferably, R _M1 and One or both of R _M2 are linear or branched alkenyl groups containing 2 to 5 carbon atoms.

In some embodiments of the present invention, preferably, one of R _M1 and R _M2 is a linear or branched alkenyl group containing 2 to 5 carbon atoms, and the other represents a linear or branched alkenyl group containing 1 to 5 carbon atoms. A straight or branched alkyl group of atoms.

In some embodiments of the present invention, preferably, both R _M1 and R _M2 are each independently a linear or branched alkyl group containing 1 to 8 carbon atoms, or a linear or branched alkyl group containing 1 to 7 carbon atoms. Straight-chain or branched alkoxy; further preferably, both R _M1 and R _M2 are each independently a straight-chain or branched alkyl group containing 1 to 5 carbon atoms, or containing 1 to 4 carbon atoms Atomized straight or branched alkoxy group.

In some embodiments of the present invention, preferably, one of R _M1 and R _M2 is a linear or branched alkyl group containing 1 to 5 carbon atoms, and the other is a linear or branched alkyl group containing 1 to 5 carbon atoms. A linear or branched alkyl group containing 1 to 4 carbon atoms, or a linear or branched alkoxy group containing 1 to 4 carbon atoms; more preferably, both R _M1 and R _M2 are each independently containing 1 to 5 A straight-chain or branched-chain alkyl group with three carbon atoms.

， 其中，*表示所鍵結的環結構中的碳原子。The alkenyl group in the present invention is preferably selected from the group represented by any one of formula (V1) to formula (V9), and is particularly preferably formula (V1), formula (V2), formula (V8) or formula ( V9). The groups represented by formula (V1) to formula (V9) are as follows:

, Where * represents the carbon atom in the bonded ring structure.

， 其中，*表示所鍵結的環結構中的碳原子。The alkenyloxy group in the present invention is preferably selected from the group represented by any one of formula (OV1) to formula (OV9), particularly preferably formula (OV1), formula (OV2), formula (OV8) or formula (OV9). The groups represented by formula (OV1) to formula (OV9) are as follows:

, Where * represents the carbon atom in the bonded ring structure.

M1；

M2；

M3；

M4；

M5；

M6；

M7；

M8；

M9；

M10；

M11；

M12；

M13；

M14；

M15；

M16；

M17；

M18；

M19；以及

M20。In some embodiments of the present invention, the compound of general formula M is selected from the group consisting of the following compounds:

M1;

M2;

M3;

M4;

M5;

M6;

M7;

M8;

M9;

M10;

M11;

M12;

M13;

M14;

M15;

M16;

M17;

M18;

M19; and

M20.

In some embodiments of the present invention, the content of the compound of general formula M must depend on solubility at low temperature, transition temperature, electrical reliability, birefringence, process adaptability, dripping marks, burn-in, and dielectric orientation. Adjust as appropriate for the required performance such as the opposite sex.

Relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of the general formula M in the liquid crystal composition of the present invention is 1%, 2%, 3%, 5%, 7%, 10 %, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, 42%, 45%, 48% or 50%; relative to the total weight of the liquid crystal composition of the present invention, the preferred upper limit value of the weight percentage of the compound of the general formula M in the liquid crystal composition of the present invention is 80%, 75%, 70 %, 65%, 60%, 55%, 50%, 45%, 40%, 38%, 35%, 33%, 30%, 28%, 25%, 22% or 20%.

In some embodiments of the present invention, the compound of the general formula M accounts for 1%-80% by weight of the liquid crystal composition.

In some embodiments of the present invention, the compound of general formula M is particularly preferably selected from general formula M1, general formula M2, general formula M6, general formula M7, general formula M8, general formula M10, general formula M11, general formula M12 , General formula M13, General formula M16, General formula M17, General formula M18, General formula M19 and General formula M20 compounds.

In some embodiments of the present invention, when reliability is important, the general formula M1, the general formula M2, the general formula M6, the general formula M7, the general formula M8, the general formula M10, the general formula M11, the general formula M12, the general formula The group consisting of compounds of formula M13, general formula M16, general formula M17, general formula M18, general formula M19, and general formula M20 includes compounds in which R _M1 and R _M2 are both alkyl groups; when emphasis is placed on reducing the volatility of the compound When, general formula M1, general formula M2, general formula M6, general formula M7, general formula M8, general formula M10, general formula M11, general formula M12, general formula M13, general formula M16, general formula M17, general formula M18, The group consisting of compounds of the general formula M19 and the general formula M20 includes compounds in which both R _M1 and R _M2 are alkoxy; and when the viscosity reduction is important, the general formula M1, the general formula M2, the general formula M6, and the general formula The group consisting of compounds of M7, general formula M8, general formula M10, general formula M11, general formula M12, general formula M13, general formula M16, general formula M17, general formula M18, general formula M19, and general formula M20 includes R _M1 A compound in which at least one of _{R M2} and R M2 is an alkenyl group.

With regard to the weight percentage of the compound of the general formula M1 in the liquid crystal composition of the present invention, the weight percentage of the compound of the general formula M1 in the liquid crystal composition of the present invention is preferably lower than the total weight of the liquid crystal composition of the present invention. The limit is 1%, 2%, 3%, 5%, 7% or 10%; relative to the total weight of the liquid crystal composition of the present invention, the compound of general formula M1 accounts for the preferred weight percentage of the liquid crystal composition of the present invention The upper limit value is 20%, 15%, 13%, 10%, 8%, 7%, 6%, 5% or 3%.

The weight percentage of the compound of the general formula M2 in the liquid crystal composition of the present invention is preferably: relative to the total weight of the liquid crystal composition of the present invention, the weight percentage of the compound of the general formula M2 in the liquid crystal composition of the present invention is preferably below The limit is 1%, 2%, 3%, 5%, 7% or 10%; relative to the total weight of the liquid crystal composition of the present invention, the compound of general formula M2 accounts for the preferred weight percentage of the liquid crystal composition of the present invention The upper limit value is 20%, 15%, 13%, 10%, 8%, 7%, 6%, 5% or 3%.

Regarding the preferred weight percentage of the compound of the general formula M6 in the liquid crystal composition of the present invention: relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of the general formula M6 in the liquid crystal composition of the present invention The value is 1%, 2%, 3%, 5%, 7%, 10%, 14%, 16%, 20%, 23%, 26%, 30%, 35% or 40%; relative to the liquid crystal of the present invention The total weight of the composition, the preferred upper limit of the weight percentage of the compound of general formula M6 in the liquid crystal composition of the present invention is 50%, 40%, 35%, 30%, 20%, 15%, 10% or 5 %.

或

。In some embodiments of the present invention, depending on the required properties such as solubility at low temperature, transition temperature, electrical reliability, birefringence, etc., it is preferable that R _M1 in the compound containing the general formula M6 contains 2-4 carbon atoms. The linear or branched alkenyl group of which R _M2 is CH ₃ -, the linear or branched alkenyl group containing 2-4 carbon atoms is further preferably

or

.

或

、且R_M2 為CH₃ -的化合物的占本發明的液晶組合物的重量百分比優選的下限值為1%，3%，5%，7%，9%，11%，12%，13%，18%或21%，並且優選上限值為45%，40%，35%，30%，25%，23%，20%，18%，15%，13%，10%或8%。在同時含有所述兩種化合物時，相對于本發明的液晶組合物總重量，所述兩種化合物的占本發明的液晶組合物的重量百分比優選的下限值為3%，5%，7%，9%，11%，13%，15%，19%，24%或30%，優選上限值為45%，40%，35%，30%，25%，23%，20%，18%，15%、13%、11%或9%。Relative to the total weight of the liquid crystal composition of the present invention, R _M1 in the compound of the general formula M6 is

or

And the _{preferred lower limit of the weight percentage of the compound in which R M2} is CH ₃ -in the liquid crystal composition of the present invention is 1%, 3%, 5%, 7%, 9%, 11%, 12%, 13% , 18% or 21%, and the preferred upper limit value is 45%, 40%, 35%, 30%, 25%, 23%, 20%, 18%, 15%, 13%, 10% or 8%. When the two compounds are contained at the same time, relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the two compounds in the liquid crystal composition of the present invention is 3%, 5%, 7 %, 9%, 11%, 13%, 15%, 19%, 24% or 30%, the preferred upper limit value is 45%, 40%, 35%, 30%, 25%, 23%, 20%, 18 %, 15%, 13%, 11% or 9%.

The weight percentage of the compound of general formula M7 in the liquid crystal composition of the present invention is preferably: relative to the total weight of the liquid crystal composition of the present invention, the weight percentage of the compound of general formula M7 in the liquid crystal composition of the present invention is preferably below The limit is 1%, 2%, 3%, 4%, 5%, 7%, 10%, 14%, 16% or 20%; relative to the total weight of the liquid crystal composition of the present invention, the compound of general formula M7 The preferred upper limit of the weight percentage of the liquid crystal composition of the present invention is 40%, 35%, 30%, 20%, 15%, 10% or 5%.

或

。In some embodiments of the present invention, depending on the required properties such as solubility at low temperature, transition temperature, electrical reliability, birefringence, etc., it is preferred that in the compound containing general formula M7, R _M1 contains 2-4 carbon atoms. The linear or branched alkenyl group of which R _M2 is CH ₃ -, the linear or branched alkenyl group containing 2-4 carbon atoms is further preferably

or

.

或

、且R_M2 為CH₃ -的化合物的占本發明的液晶組合物的重量百分比優選的下限值為1%，3%，4%，5%，7%，9%，11%，12%，13%，18%或20%，並且優選上限值為40%，35%，30%，25%，23%，20%，18%，15%，13%，10%或8%。在同時含有所述兩種化合物時，相對于本發明的液晶組合物的總重量，所述兩種化合物的占本發明的液晶組合物的重量百分比優選的下限值為3%，5%，7%，9%， 11%，13%，15%，19%，24%或30%，並且優選上限值為40%，35%，30%，25%，23%，20%，18%，15%或13%。Relative to the total weight of the liquid crystal composition of the present invention, R _M1 in the compound of the general formula M7 is

or

And the _{preferred lower limit of the weight percentage of the compound in which R M2} is CH ₃ -in the liquid crystal composition of the present invention is 1%, 3%, 4%, 5%, 7%, 9%, 11%, 12% , 13%, 18% or 20%, and the preferred upper limit value is 40%, 35%, 30%, 25%, 23%, 20%, 18%, 15%, 13%, 10% or 8%. When the two compounds are contained at the same time, relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the two compounds in the liquid crystal composition of the present invention is 3%, 5%, 7%, 9%, 11%, 13%, 15%, 19%, 24% or 30%, and the preferred upper limit value is 40%, 35%, 30%, 25%, 23%, 20%, 18% , 15% or 13%.

Regarding the preferred weight percentage of the compound of the general formula M8 in the liquid crystal composition of the present invention: relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of the general formula M8 in the liquid crystal composition of the present invention The value is 1%, 2%, 3%, 5%, 7%, 10%, 14%, 16%, 20%, 23%, 26%, 30%, 35% or 40%; relative to the liquid crystal of the present invention The total weight of the composition, the preferred upper limit of the weight percentage of the compound of the general formula M8 in the liquid crystal composition of the present invention is 50%, 40%, 35%, 30%, 20%, 15%, 10% or 5 %.

或

、且R_M2 為正丙基的化合物，或優選R_M1 為正丙基、正丁基或正戊基、且R_M2 為CH₃ O-的化合物；特別優選R_M1 為正丙基、且R_M2 為C₂ H₅ -的化合物。In some embodiments of the present invention, the compound of general formula M8 is preferably a compound where R _M1 is n-propyl or n-pentyl, and R _M2 is C ₂ H ₅ -, or preferably R _M1 is

or

And R _M2 is n-propyl compound, or preferably R _M1 is n-propyl, n-butyl or n-pentyl, and R _M2 is CH ₃ O-; particularly preferably R _M1 is n-propyl, and R _M2 is a compound of C ₂ H _{5 -.}

Regarding the preferred weight percentage of the compound of the general formula M10 in the liquid crystal composition of the present invention: relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of the general formula M10 in the liquid crystal composition of the present invention The value is 1%, 2%, 3%, 5%, 7%, 10%, 14%, 16%, 20%, 23%, 26%, 30%, 35% or 40%; relative to the liquid crystal of the present invention The total weight of the composition, the preferred upper limit of the weight percentage of the compound of the general formula M10 in the liquid crystal composition of the present invention is 50%, 40%, 35%, 30%, 20%, 15%, 10% or 5 %.

或

、而另一者為CH₃ -或C₂ H₅ -的化合物。In some embodiments of the present invention, the compound of general formula M10 preferably R _M1 and R _M2 each independently represent a compound containing a linear or branched alkyl group of 2-5 carbon atoms, or preferably R _M1 and R _M2 One of

or

, And the other is a compound _{of CH 3} -or C ₂ H _{5 -.}

Regarding the preferred weight percentage of the compound of the general formula M11 in the liquid crystal composition of the present invention: relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of the general formula M11 in the liquid crystal composition of the present invention The value is 1%, 2%, 3%, 5%, 7%, 10%, 12%, 14%, 16%, 18%, 20%, 23%, 26%, 30%, 35% or 40%; Relative to the total weight of the liquid crystal composition of the present invention, the preferred upper limit value of the weight percentage of the compound of the general formula M11 in the liquid crystal composition of the present invention is 50%, 40%, 35%, 30%, 25%, 22 %, 20%, 18%, 15%, 12%, 10%, 8% or 5%.

Regarding the preferred weight percentage of the compound of the general formula M12 in the liquid crystal composition of the present invention: relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of the general formula M12 in the liquid crystal composition of the present invention The value is 1%, 2%, 3%, 5%, 7%, 10%, 12%, 14%, 16%, 18%, 20%, 23%, 26%, 30%, 35% or 40%; Relative to the total weight of the liquid crystal composition of the present invention, the preferred upper limit value of the weight percentage of the compound of the general formula M12 in the liquid crystal composition of the present invention is 50%, 40%, 35%, 30%, 25%, 22 %, 20%, 18%, 15%, 12%, 10%, 8% or 5%.

Regarding the preferred weight percentage of the compound of the general formula M13 in the liquid crystal composition of the present invention: relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of the general formula M13 in the liquid crystal composition of the present invention The value is 1%, 2%, 3%, 5%, 7%, 10%, 12%, 14%, 16%, 18%, 20%, 23%, 26%, 30%, 35% or 40%; Relative to the total weight of the liquid crystal composition of the present invention, the preferred upper limit of the weight percentage of the compound of the general formula M13 in the liquid crystal composition of the present invention is 50%, 40%, 35%, 30%, 25%, 22 %, 20%, 18%, 15%, 12%, 10%, 8% or 5%.

Regarding the weight percentage of the compounds of the general formulas M16 to M20 in the liquid crystal composition of the present invention, it is preferred that: relative to the total weight of the liquid crystal composition of the present invention, the compounds of the general formulas M16 to M20 account for the total weight of the liquid crystal composition of the present invention. The preferred lower limit of the weight percentage is 1%, 2%, 3%, 5%, 7%, 10%, 14%, 16% or 20%; relative to the total weight of the liquid crystal composition of the present invention, the general formula M16 The preferred upper limit of the ~M20 compound in the total weight percentage of the liquid crystal composition of the present invention is 30%, 25%, 23%, 20%, 18%, 15%, 12%, 10% or 5%.

； 其中， R_A1 表示含有1-12個碳原子的直鏈或支鏈的烷基、

、

或

，所述含有1-12個碳原子的直鏈或支鏈的烷基中的1個或不相鄰的2個以上的-CH₂ -可分別獨立地被-CH＝CH-、-C≡C-、-O-、-CO-、-CO-O-或-O-CO-替代，並且所述含有1-12個碳原子的直鏈或支鏈的烷基、

、

或

中的一個或更多個-H可分別獨立地被-F或-Cl取代； 環

和環

各自獨立地表示

、

、

或

，其中，

、

和

中至多1個-CH₂ -可被-O-替代，一個或更多個環中單鍵可被雙鍵替代，

和

中的一個或更多個-H可被-CN、-F或-Cl取代，一個或更多個環中-CH=可被-N=替代； Z_A11 表示單鍵、-CH₂ CH₂ -、-CF₂ CF₂ -、-CO-O-、-O-CO-、-O-CO-O-、-CH＝CH-、-CF＝CF-、-CH₂ O-或-OCH₂ -； L_A11 、L_A12 和L_A13 各自獨立地表示-H、-F或-CH₃ ； X_A1 表示鹵素、含有1-5個碳原子的鹵代烷基或鹵代烷氧基、含有2-5個碳原子的鹵代烯基或鹵代烯氧基；並且 n_A1 表示0、1、2或3，且當n_A1 =2或3時，環

可以相同或不同，Z_A11 可以相同或不同。In some embodiments of the present invention, the liquid crystal composition further contains at least one compound of the general formula A-1, which has a positive dielectric anisotropy:

; Wherein, R _A1 represents a linear or branched alkyl group containing 1-12 carbon atoms,

,

or

_{, One or two or more non-adjacent -CH 2} -in the linear or branched alkyl group containing 1-12 carbon atoms can be independently controlled by -CH=CH-, -C≡ C-, -O-, -CO-, -CO-O- or -O-CO- substitution, and the linear or branched alkyl group containing 1-12 carbon atoms,

,

or

One or more of -H may be independently substituted by -F or -Cl; ring

And ring

Expressed independently of each other

,

,

or

,in,

,

with

At most one -CH ₂ -can be replaced by -O-, one or more single bonds in the ring can be replaced by double bonds,

with

One or more of -H can be replaced by -CN, -F or -Cl, and -CH= can be replaced by -N= in one or more rings; Z _A11 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- ; L _A11 , L _A12 and L _A13 each independently represent -H, -F or -CH ₃ ; X _A1 represents halogen, a halogenated alkyl group containing 1-5 carbon atoms or a halogenated alkoxy group, containing 2-5 carbon atoms的haloalkenyl or haloalkenyloxy; and n _A1 represents 0, 1, 2 or 3, and when n _A1 = 2 or 3, the ring

It can be the same or different, and Z _A11 can be the same or different.

In some embodiments of the present invention, the compound of the general formula A-1 is preferably a compound having an absolute value of dielectric anisotropy greater than 4.

A-1-1；

A-1-2；

A-1-3；

A-1-4；

A-1-5；

A-1-6；

A-1-7；

A-1-8；

A-1-9；

A-1-10；

A-1-11；

A-1-12；

A-1-13；

A-1-14；

A-1-15；

A-1-16；

A-1-17；

A-1-18；

A-1-19；

A-1-20；

A-1-21；

A-1-22；

A-1-23；

A-1-24；

A-1-25；

A-1-26；

A-1-27；

A-1-28；

A-1-29；

A-1-30；

A-1-31；

A-1-32；

A-1-33；

A-1-34；

A-1-35；

A-1-36；

A-1-37；

A-1-38；

A-1-39；

A-1-40；

A-1-41；

A-1-42；

A-1-43；

A-1-44；

A-1-45；

A-1-46；

A-1-47；

A-1-48；以及

A-1-49， 其中， R_A1 表示含有1-12個碳原子的直鏈或支鏈的烷基，所述含有1-12個碳原子的直鏈或支鏈的烷基中的1個或不相鄰的2個以上的-CH₂ -可分別獨立地被-CH＝CH-、-C≡C-、-O-、-CO-、-CO-O-或-O-CO-替代。In some embodiments of the present invention, the compound of general formula A-1 is selected from the group consisting of the following compounds:

A-1-1;

A-1-2;

A-1-3;

A-1-4;

A-1-5;

A-1-6;

A-1-7;

A-1-8;

A-1-9;

A-1-10;

A-1-11;

A-1-12;

A-1-13;

A-1-14;

A-1-15;

A-1-16;

A-1-17;

A-1-18;

A-1-19;

A-1-20;

A-1-21;

A-1-22;

A-1-23;

A-1-24;

A-1-25;

A-1-26;

A-1-27;

A-1-28;

A-1-29;

A-1-30;

A-1-31;

A-1-32;

A-1-33;

A-1-34;

A-1-35;

A-1-36;

A-1-37;

A-1-38;

A-1-39;

A-1-40;

A-1-41;

A-1-42;

A-1-43;

A-1-44;

A-1-45;

A-1-46;

A-1-47;

A-1-48; and

A-1-49, where R _A1 represents a linear or branched alkyl group containing 1-12 carbon atoms, one of the linear or branched alkyl groups containing 1-12 carbon atoms Or two or more non-adjacent -CH ₂ -can be replaced independently by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO- .

Regarding the weight percentage of the compound of the general formula A-1 in the liquid crystal composition of the present invention, it is preferred: relative to the total weight of the liquid crystal composition of the present invention, the compound of the general formula A-1 accounts for the weight percentage of the liquid crystal composition of the present invention The preferred lower limit is 0%, 1%, 5%, 10%, 12%, 15%, 18%, 20%, 30%, 40%, 50%, 55%, 60%, 65%, 70% , 75% or 80%; relative to the total weight of the liquid crystal composition of the present invention, the preferred upper limit of the weight percentage of the compound of general formula A-1 in the liquid crystal composition of the present invention is 80%, 75%, 70 %, 65%, 60%, 55%, 50%, 45%, 40%, 35%, 30% or 25%.

In some embodiments of the present invention, the compound of general formula A-1 is preferably selected from general formula A-1-5, general formula A-1-13, general formula A-1-22, general formula A-1-23, General formula A-1-24, general formula A-1-27, general formula A-1-30, general formula A-1-31, general formula A-1-35, general formula A-1-40 and general formula A-1-44 compound group.

In addition to the above-mentioned compounds, the liquid crystal composition of the present invention may also contain ordinary nematic liquid crystals, smectic liquid crystals, cholesteric liquid crystals, antioxidants, ultraviolet absorbers, infrared absorbers, polymerizable monomers, light stabilizers, etc. .

；

；

；

；

；

；

；

；

；

；

；

；以及

。The following shows possible dopants that are preferably added to the liquid crystal composition according to the present invention.

；

；

；

；

；

；

；

；

；

；

；

;as well as

.

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

其中，n表示1-12的正整數。In addition, additives such as antioxidants and light stabilizers used in the liquid crystal composition of the present invention are preferably the following:

Among them, n represents a positive integer of 1-12.

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

In some embodiments of the present invention, preferably, the light stabilizer accounts for 0-5% of the total weight of the liquid crystal composition; more preferably, the light stabilizer accounts for 0 to 1% of the total weight of the liquid crystal composition; Particularly preferably, the light stabilizer accounts for 0-0.1% of the total weight of the liquid crystal composition.

In some embodiments of the present invention, the clearing point Cp of the liquid crystal composition is in the range of 80-120°C, preferably 85-110°C, more preferably 90-110°C; the range of the dielectric anisotropy Δε is 6-12 , Preferably 7-11, more preferably 7.5-10.5, still more preferably 8-10.5; the range of optical anisotropy Δn is 0.08-0.12, preferably 0.085-0.115, more preferably 0.09-0.11, still more preferably 0.09 -0.105; the average elastic constant K _{ave is} not less than 13.9; the transmittance T is not less than 12.5%; the low temperature phase transition point T _{S→N is} greater than -30°C and the storage time is greater than 5 days.

Another aspect of the present invention also provides a liquid crystal display device comprising the above-mentioned liquid crystal composition.

Beneficial effects: The liquid crystal composition provided by the present invention has high dielectric anisotropy, appropriately high optical anisotropy, appropriately high clearing point, high transmittance, high transmittance, good low temperature stability, and The larger average elastic constant K _ave enables the liquid crystal display device including the liquid crystal composition of the present invention to have higher contrast, relatively less light scattering, and good display effects. In particular, in the liquid crystal composition of the present invention, when the compound of general formula I is added, the liquid crystal composition has a higher transmittance, so the compound of general formula I can achieve the technical effect of effectively adjusting the transmittance of the liquid crystal composition ; When the compound of general formula III is added, the low temperature stability of the liquid crystal composition can be effectively improved. The inventors of the present invention surprisingly found that by including compounds of the general formula I, the general formula II, the general formula III, and the general formula M in the liquid crystal composition, the average elastic constant K _{ave of the liquid crystal composition can be effectively adjusted} , So that the liquid crystal composition can obtain a larger K _ave , so that the liquid crystal display device including the liquid crystal composition of the present invention can obtain relatively less light scattering and good display effect.

The present invention will be described below in conjunction with specific embodiments. It should be noted that the following embodiments are examples of the present invention, which are only used to illustrate the present invention, but not to limit the present invention. Without departing from the spirit or scope of the present invention, other combinations and various improvements within the concept of the present invention can be made.

The liquid crystal displays used in the following embodiments are all TFT liquid crystal display devices, with a cell thickness of d=7 μm (except for special instructions).

For ease of expression, in the following examples, the group structure of the liquid crystal composition is represented by the code listed in Table 1: Table 1 The group structure code of the liquid crystal compound

該結構式如用表1所列代碼表示，則可表達為：nCCGF，代碼中的n表示左端烷基的C原子數，例如n為“3”，即表示該烷基為-C₃ H₇ ；代碼中的C代表環己烷基，G代表2-氟-1,4-亞苯基，F代表氟。Take the compound of the following structural formula as an example:

If the structural formula is expressed by the code listed in Table 1, it can be expressed as: nCCGF, where n in the code represents the number of C atoms of the left-end alkyl group, for example, n is "3", which means that the alkyl group is -C ₃ H ₇ ; C in the code represents cyclohexane, G represents 2-fluoro-1,4-phenylene, and F represents fluorine.

The abbreviated codes of the test projects in the following embodiments are as follows:

Among them, the optical anisotropy was measured using an Abbe refractometer under a sodium light (589 nm) light source at 25°C.

Δε=ε _‖ -ε _⊥ , where ε _‖ is the permittivity parallel to the molecular axis, and ε _⊥ is the permittivity perpendicular to the molecular axis. Test conditions: 25℃, 1 KHz, test box is TN90 type, box 7 μm thick.

（K₁₁ +K₂₂ +K₃₃ ）。K ₁₁ , K ₂₂ , and K ₃₃ are calculated by using LCR meter and anti-parallel friction box to test the CV curve of liquid crystal. Test conditions: 7 μm anti-parallel friction box, V=0.1~20 V; K _ave =

(K ₁₁ +K ₂₂ +K ₃₃ ).

Test conditions for T transmittance: use a DMS 505 tester to test the transmittance of the dimming device at the clearing point ±10° C. The dimming device box is an IPS-type liquid crystal test box with a thickness of 3.5 μm.

The components 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 compounds are tested to meet the standards of electronic compounds.

The liquid crystal composition was prepared according to the ratio of each liquid crystal composition specified in the following examples. The preparation of the liquid crystal composition is carried out in accordance with conventional methods in the field, such as heating, ultrasonic, suspending, etc., and mixing in a prescribed ratio.

The liquid crystal compositions given in the following examples were prepared and studied. The following shows the composition of each liquid crystal composition and the test results of its performance parameters.

Comparison 1

The liquid crystal composition of Comparative Example 1 was prepared according to the compounds and weight percentages listed in Table 2, which was filled between the two substrates of the liquid crystal display for performance testing. Table 2 Liquid crystal composition formula and performance parameter test

Example 1

The liquid crystal composition of Example 1 was prepared according to the compounds and weight percentages listed in Table 3, and the liquid crystal composition was filled between the two substrates of the liquid crystal display for performance testing. Table 3 Liquid crystal composition formula and performance parameter test

Example 2

The liquid crystal composition of Example 2 was prepared according to the compounds and weight percentages listed in Table 4, and the liquid crystal composition was filled between the two substrates of the liquid crystal display for performance testing. Table 4 Liquid crystal composition formula and performance parameter test

Example 3

The liquid crystal composition of Example 3 was prepared according to the compounds and weight percentages listed in Table 5, and the liquid crystal composition was filled between the two substrates of the liquid crystal display for performance testing. Table 5 Liquid crystal composition formula and performance parameter test

Example 4

The liquid crystal composition of Example 4 was prepared according to the compounds and weight percentages listed in Table 6, and the liquid crystal composition was filled between the two substrates of the liquid crystal display for performance testing. Table 6 Liquid crystal composition formula and performance parameter test

Example 5

The liquid crystal composition of Example 5 was prepared according to the compounds and weight percentages listed in Table 7, and the liquid crystal composition was filled between the two substrates of the liquid crystal display for performance testing. Table 7 Liquid crystal composition formula and performance parameter test

From the above Comparative Example 1 and Examples 1-5, it can be seen that the liquid crystal composition provided by the present invention has high dielectric anisotropy, appropriately high optical anisotropy, appropriately high clearing point, high transmittance, and high The transmittance, good low temperature stability, and large K _ave make the liquid crystal display device containing the liquid crystal composition of the present invention have high contrast, relatively little light scattering, and good display effects.

The above embodiments are only to illustrate the technical ideas and features of the present invention, and their purpose is to let those familiar with the technology understand the content of the present invention and implement it, and cannot limit the scope of protection of the present invention. All equivalent changes or modifications should be covered by the protection scope of the present invention.

Claims (11)

A liquid crystal composition comprising: at least one compound of general formula I

At least one compound of general formula II

At least one compound of general formula III

; And at least one compound of general formula M

Wherein, R ₁ and R _A2 each independently represent a linear or branched alkyl group containing 1-12 carbon atoms,

or

_{, One or two or more non-adjacent -CH 2} -in the linear or branched alkyl group containing 1-12 carbon atoms can be independently controlled by -C=C-, -C≡ C-, -O-, -CO-, -CO-O- or -O-CO- substitution, and the linear or branched alkyl group containing 1-12 carbon atoms,

or

One or more of -H may be independently substituted by -F or -Cl; R ₂ and R ₃ each independently represent a linear or branched alkyl group containing 1-12 carbon atoms, containing 2- A straight-chain or branched alkenyl group with 12 carbon atoms, one of the straight-chain or branched-chain alkyl group containing 1-12 carbon atoms or two or more non-adjacent -CH ₂ -may Are independently replaced by -C≡C-, -O-, -CO-, -CO-O- or -O-CO-, and the linear or branched alkyl group containing 1-12 carbon atoms One or more of -H may be independently substituted by -F or -Cl; R _M1 and R _M2 each independently represent -H, a linear or branched alkyl group containing 1-12 carbon atoms, A straight or branched alkenyl group containing 2-12 carbon atoms,

or

_{, One or two or more non-adjacent -CH 2} -in the linear or branched alkyl group containing 1-12 carbon atoms can be independently replaced by -C≡C-, -O- , -CO-, -CO-O- or -O-CO- substitution; ring

,ring

,ring

And ring

Expressed independently of each other

or

,in,

One or more -CH ₂ -can be replaced by -O-, one or more single bonds in the ring can be replaced by double bonds,

One or more of -H can be replaced by -CN, -F or -Cl, and -CH= can be replaced by -N= in one or more rings;

,ring

And ring

Expressed independently of each other

or

,in

One or more of -CH ₂ -can be replaced by -O-,

At most one of -H may be substituted by halogen; Z ₁ , Z ₂ and Z ₃ each independently represent a single bond, -CH ₂ CH ₂ -, -CF ₂ CF ₂ -, -CF ₂ O-, -OCF _2- , -CO-O-, -O-CO-, -O-CO-O-, -CH=CH-, -CF=CF-, -CH ₂ O- or -OCH ₂ -; Z _A21 and Z _A22 each Independently represent 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 -; Z _M1 and Z _M2 each independently represent a single bond, -CO-O-, -O-CO-, -CH ₂ O-, -OCH ₂ -, -CH =CH-, -C≡C-, -CH ₂ CH ₂ -or -(CH ₂ ) ₄ -; L ₁ , L ₂ , L ₃ , L ₄ , L _A21 , L _A22 , L _A23 and L _A24 are independent Ground represents -H, an alkyl group containing 1-3 carbon atoms, or halogen; X represents a halogen, a halogenated alkyl group or a halogenated alkoxy group containing 1-5 carbon atoms, and a halogenated alkenyl group containing 2-5 carbon atoms Or haloalkenyloxy; X _A2 represents halogen, haloalkyl or haloalkoxy containing 1-5 carbon atoms, haloalkenyl or haloalkenyloxy containing 2-5 carbon atoms; n1 and n2 are each Independently represents 0, 1, or 2, and 0

n1+n2

3, and when n1=2, the ring

Can be the same or different, Z ₁ can be the same or different, when n2=2, the ring

Can be the same or different, Z ₂ can be the same or different; and n _A2 represents 0, 1, 2 or 3, and when n _A2 = 2 or 3, the ring

Can be the same or different, Z _A21 can be the same or different; n _M1 represents 0, 1, 2 or 3, and when n _M1 = 2 or 3, the ring

Can be the same or different, Z _M2 can be the same or different; when Z _M1 and Z _M2 represent a single bond, n _M1 represents 0, the ring

And ring

Not at the same time expressed as

When Z ₁ , Z ₂ and Z ₃ each independently represent 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 -, 2

n1+n2

3; and when the ring

And ring

One of them means

When, n _A2 represents 1; wherein, the compound of general formula I is selected from the group consisting of the following compounds:

;as well as

Wherein, L ₅ , L ₆ and L ₇ each independently represent -H or -F; R _x and R _y each independently represent -CH ₂ -or -O-; and n1 represents 0 or 1. The liquid crystal composition described in item 1 of the scope of patent application, wherein the ring

ring

,ring

And ring

Expressed independently of each other

According to the liquid crystal composition described in item 1 or 2 of the scope of patent application, the weight percentage of the compound of the general formula I in the liquid crystal composition is 0.1%-60%. The liquid crystal composition according to item 1 or 2 of the scope of patent application, wherein the compound of general formula II is selected from the group consisting of the following compounds:

;as well as

According to the liquid crystal composition described in item 4 of the scope of patent application, the weight percentage of the compound of the general formula II in the liquid crystal composition is 0.1%-80%. The liquid crystal composition described in item 1 of the scope of the patent application, wherein the compound of the general formula III is selected from the group consisting of the following compounds:

;as well as

Wherein, R ₂ represents a linear or branched alkyl group or alkoxy group containing 1-8 carbon atoms, or a linear or branched alkenyl group or alkenyloxy group containing 2-8 carbon atoms; and R ₂₁ and R ₃₁ each independently represent a linear or branched alkyl group or alkoxy group containing 1 to 8 carbon atoms. The liquid crystal composition described in item 6 of the scope of patent application, wherein the compound of general formula III is selected from the group consisting of the following compounds:

;as well as

According to the liquid crystal composition described in item 6 or 7 of the scope of patent application, the weight percentage of the compound of the general formula III in the liquid crystal composition is 0.1%-70%. The liquid crystal composition according to item 1 of the scope of patent application, wherein the compound of the general formula M is selected from the group consisting of the following compounds:

;as well as

According to the liquid crystal composition described in item 9 of the scope of patent application, the weight percentage of the compound of the general formula M in the liquid crystal composition is 1%-80%. A display device comprising the liquid crystal composition described in any one of items 1-10 in the scope of the patent application.