TWI761717B - Liquid crystal composition and display device thereof - 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 comprising the liquid crystal composition. The liquid crystal composition provided by the present invention has high dielectric anisotropy, moderately high optical anisotropy, moderately high clearing point, high transmittance, good low temperature stability, and large _Kave , so that it contains The liquid crystal display device of the liquid crystal composition of the present invention has high contrast ratio, relatively less light scattering, and good display effect.

Description

Liquid crystal composition and display device thereof

The present 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 molecular compounds with both liquid fluidity and crystal anisotropy at a certain temperature. The liquid crystal display device utilizes the optical anisotropy and dielectric anisotropy of the liquid crystal material itself to work, and has 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 In-plane switching (IPS), vertical alignment (VA), fringe field switching (FFS), field-induced photo-reactive alignment (FPA) and other modes.

Liquid Crystal Display (LCD) has achieved rapid development due to its small size, light weight, low power consumption and excellent display quality, and has been widely used especially in portable electronic information products. With the increase in the size of LCD screens for portable computers, office applications, and video applications, there are still some problems to be solved in order to enable LCD monitors to be used for large screen displays and eventually replace Cathode Ray Tubes (CRTs). problems, such as improving viewing angle characteristics, increasing response speed, increasing contrast, increasing transmittance, etc. The relatively narrow viewing angle of LCD means that the contrast is significantly reduced when viewed from the direction perpendicular to the normal of the liquid crystal cell, and grayscale and color inversion will occur when the viewing angle is large, which seriously affects the display quality of the LCD.

The viewing angle problem of LCD is determined by the working principle of the liquid crystal material. 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; conversely, the larger the birefringence. The light rays incident on the liquid crystal cell at different angles from the normal direction of the display screen and the directors of the liquid crystal molecules have different angles, so 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 normal direction of the liquid crystal cell. For obliquely incident light, the minimum transmittance increases with the increase of the included angle, and the contrast decreases. When the included angle is large enough , even contrast inversion occurs.

At present, many methods have been proposed to solve the viewing angle problem, such as: optically compensated bend (OCB) mode, in-plane switching (IPS) mode, fringe field switching (FFS) patterns and multi-domain vertical alignment (multi-vertical alignment, MVA) patterns, etc. They all 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 also 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. Add a few seconds of voltage to preset, and then you can maintain this arrangement at a lower voltage, which is inconvenient to use; IPS mode only requires linear polarizers without compensation films, but its response speed is too slow, Fast motion pictures cannot be displayed. Since the IPS mode and the FFS mode are easy to manufacture and have a wide viewing angle, they are the most attractive ways to improve viewing angle characteristics and realize large-area display.

In the early 1970s, the basic electro-optical properties of uniformly aligned and twisted aligned, nematic liquid crystal IPS modes, characterized by the fabrication of a pair of electrodes on the same substrate and the other on the other, were experimentally investigated. Without electrodes, the arrangement of liquid crystal molecules is controlled by the transverse electric field applied between the pair of electrodes, so this mode can also be called transverse 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 no electric field is applied, the incident light is blocked by two orthogonal polarizers and is in a dark state. When the electric field is applied, the liquid crystal molecules rotate and cause delay, so light leaks from the two orthogonal polarizers. Using IPS The advantages of the mode panel are large viewing angle and accurate color reproduction, but the disadvantages are serious light leakage, slow response speed, and high power consumption.

With the wide application of TFT-type LCDs, the requirements for its performance are also increasing. High display image quality requires faster response speed, lower power consumption, and higher low-temperature reliability. Higher contrast and transmittance are required, especially for IPS-type liquid crystal display modes. This means that the liquid crystal material needs to have higher contrast ratio and transmittance, higher elastic constant, higher dielectric constant and low temperature reliability, and the improvement of these properties requires the improvement of the liquid crystal material.

（其中，χ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，若要提高正性液晶材料的透過率，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 _⊥ (“∝” represents the “inverse proportional” relationship, ε _⊥ represents the dielectric constant perpendicular to the molecular axis), to improve the liquid crystal material It is possible to try to reduce the Δε of the liquid crystal medium, but the adjustment range of the driving voltage of the same product is generally limited. In addition, under the action of the vertical component of the fringe electric field, the liquid crystal molecules will tilt towards the Z-axis direction, resulting in a change in its optical anisotropy Δn. 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, and if you want to improve the positive The transmittance of the liquid crystal material 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, color filter film light leakage (CF/TFT scattering) and polarization ability, as shown in Figure 1, where light scattering accounts for 63% of the factors affecting 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 _Kave (where,

) to improve light scattering; in the case of increasing _Kave , the light leakage of the liquid crystal material can be reduced.

In addition, the relationship between the contrast ratio (CR) and the 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 in L ₀ that significantly affects CR. In the off state, L ₀ has nothing to do with the dielectric of 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 the contrast (CR) will also significantly improved.

In view of the above situation, the common ways to improve the transmittance of liquid crystal materials can be considered from the following two aspects: (1) Keep the dielectric anisotropy Δε of the liquid crystal composition unchanged, and the transmittance can be effectively improved by increasing ε _⊥ (2) Increase the value of the average elastic constant _Kave of the liquid crystal composition, so that the order of the liquid crystal molecules is better and the light leakage is less, thereby increasing the transmittance. In view of some deficiencies of the current liquid crystal composition, the present invention provides a liquid crystal composition with good properties, especially a liquid crystal composition with high transmittance, high average elastic constant, and good low temperature stability and other characteristics. thing.

Purpose of the invention: The purpose of the present invention is to provide a kind of high dielectric anisotropy, suitably high optical anisotropy, suitably high clearing point, high transmittance, good low temperature stability, and large _Kave liquid crystal composition. Another object of the present invention is to provide a liquid crystal display device comprising 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 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、

、

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，並且所述含有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

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； X₂₁ 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； X₂₂ 和X₂₃ 各自獨立地表示-H、鹵素、含有1-3個碳原子的鹵代烷基或鹵代烷氧基、含有2-3個碳原子的鹵代烯基或鹵代烯氧基，其中，X₂₂ 和X₂₃ 中僅其中之一表示H； 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； 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_A21 和Z_A22 表示單鍵，n_A2 表示1，環

表示

，環

表示一個或更多個-H可被-F或-Cl取代的

時，L_A21 、L_A22 、L_A23 和L_A24 中至少一個不為-H； 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 solution of the present invention: In order to achieve the above purpose of the invention, the present invention provides a liquid crystal composition, the liquid crystal composition comprising: at least one compound of the general formula I

I; at least one compound of formula II

II; at least one compound of general formula III

III; and at least one compound of general formula M

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

,

or

, 1 or non-adjacent 2 or more -CH ₂ - in the linear or branched alkyl group containing 1-12 carbon atoms can be independently represented by -C=C-, -C≡ C-, -O-, -CO-, -CO-O- or -O-CO- is substituted, and the linear or branched alkyl group containing 1-12 carbon atoms,

,

or

One or more -H in the can be independently substituted by -F or -Cl; R ₂ represents a straight-chain or branched alkyl group containing 1-12 carbon atoms, a straight-chain alkyl group containing 2-12 carbon atoms chain or branched alkenyl,

,

or

, 1 or non-adjacent 2 or more -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- is substituted, and the straight-chain or branched alkyl group containing 1-12 carbon atoms, the straight-chain or branched alkyl group containing 2-12 carbon atoms chain alkenyl,

,

or

One or more -Hs in can be independently replaced by -F or -Cl; R _M1 and R _M2 each independently represent -H, a straight-chain or branched alkyl group containing 1-12 carbon atoms, Linear or branched alkenyl containing 2-12 carbon atoms,

,

or

, 1 or non-adjacent 2 or more -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

represent independently

or

,in,

One or more -CH ₂ - can be replaced by -O-, single bond can be replaced by double bond in one or more rings,

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

,ring

and ring

represent independently

or

,in

One or more of the -CH ₂ - may 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 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 -; 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 each independently Ground represents -H, an alkyl group containing 1-3 carbon atoms, or halogen; X represents halogen, a halogenated alkyl group containing 1-5 carbon atoms or a halogenated alkoxy group, 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 haloalkenyl containing 2-5 carbon atoms; X ₂₁ represents halogen , haloalkyl or haloalkoxy containing 1-5 carbon atoms, haloalkenyl or haloalkenyl containing 2-5 carbon atoms; X ₂₂ and X ₂₃ each independently represent -H, halogen, containing haloalkyl or haloalkoxy of 1 to 3 carbon atoms, haloalkenyl or haloalkenyl of 2 to 3 carbon atoms, wherein only one of X ₂₂ and X ₂₃ represents H; n1 and n2 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

may be the same or different, Z ₂ may be the same or different; 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 _A21 and Z _A22 represent a single bond, n _A2 represents 1, a ring

express

,ring

Indicates that one or more -H may be replaced by -F or -Cl

, at least one of L _A21 , L _A22 , L _A23 and L _A24 is not -H; 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 the

, n _A2 represents 1.

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

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

In some embodiments of the present invention, the compound of formula M has an absolute value of dielectric anisotropy of not more than 3; preferably, the absolute value of the dielectric anisotropy of the compound of formula M is not more than 2.

In some embodiments of the present invention, the content of the compound of general formula I is necessary according to solubility at low temperature, transition temperature, electrical reliability, transmittance, contrast, birefringence, process suitability, drip marks, burn-in , dielectric anisotropy and other required properties can be adjusted appropriately.

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 the general 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 general 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 general 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 straight-chain or branched alkyl or alkoxy group containing 1-8 carbon atoms, an alkyl group containing 2-8 carbon atoms Linear or branched alkenyl or alkenyloxy; further preferably linear or branched alkyl or alkoxy containing 1-5 carbon atoms, linear or branched containing 2-5 carbon atoms alkenyl or alkenyloxy.

和環

各自獨立地表示

、

、

、

、

、

、

、

、

、

、

、

、

、

、

、

、

或

。In some embodiments of the invention, the ring

and ring

represent independently

,

,

,

,

,

,

,

,

,

,

,

,

,

,

,

,

or

.

In some embodiments of the 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:

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, 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.

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, general formula I-11; further preferably It contains 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~I-8, general formula I-9; further preferably It contains 2 to 10 compounds of general formula I-1~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 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 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 the group consisting of general formula 1-1-6, general formula 1-6-6, general formula 1-2-6, general formula 1-8-9, general formula The group consisting of I-5-6 and compounds of general formula I-4-6.

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

和環

各自獨立地表示

、

、

、

、

、

、

、

、

、

、

、

、

、

、

、

、

或

。In some embodiments of the invention, the ring

and ring

represent independently

,

,

,

,

,

,

,

,

,

,

,

,

,

,

,

,

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；以及

Ⅱ-43。In some embodiments of the present invention, the compound of general formula II is selected from the group consisting of:

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; and

II-43.

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 contains at least one compound of general formula II-1~II-3, II-15~II-20, II- 25. Compounds of II-27~II-43; more preferably containing 2 to 12 kinds of general formulas II-1~II-3, II-15~II-20, II-25, II-27~II-43 Compound; more preferably containing 2 to 10 compounds of general formula II-1~II-3, II-15~II-20, II-25, II-27~II-43; still more preferably containing 2 to 8 compounds of general formula II-1~II-3, II-15~II-20, II-25, II-27~II-43.

In some embodiments of the present invention, the compound of general formula II is selected from the group consisting of general formula II-1, general formula II-2, general formula II-3, general formula II-5, general formula II-15, general formula II- 16. The group consisting of compounds of general formula II-17, general formula II-23, general formula II-25, general formula II-26, general formula II-27, general formula II-28 and general formula II-34.

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 the 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 general 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 value of the content of the compound of general formula II is slightly lower and the upper limit value is slightly lower. Low, wherein, 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 value 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 kept high and the temperature stability is good, the lower limit of the content of the compound of the general formula II is preferred Slightly lower and the upper limit is slightly lower, wherein 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, in order to keep the driving voltage low and to increase the dielectric anisotropy, it is preferable to increase the lower limit value and the upper limit value of the content of the compound of the general formula II, wherein the lower limit value is higher. The value is preferably: 5%, 10%, 13%, 14%, 15%, 18%, 20%, 23%, 25%, 28% or 30%, and the upper limit value is preferably: 55%, 50%, 40%, 38%, 35%, 33%, 30%, 28% or 25%.

Ⅲ-a；

Ⅲ-b；

Ⅲ-c；

Ⅲ-d；

Ⅲ-e；

Ⅲ-f；

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。In some embodiments of the present invention, the compound of general formula III is selected from the group consisting of:

III-a;

III-b;

III-c;

III-d;

III-e;

III-f;

III-g; and

III-h, wherein, R ₂ represents a linear or branched alkyl or alkoxy group containing 1-8 carbon atoms, or a linear or branched alkenyl or alkenyl group containing 2-8 carbon atoms base.

Regarding the preferred weight percentage of the compound of general formula III 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 weight percentage of the compound of general formula III in the liquid crystal composition of the present invention is as follows Limits are 2%, 2.5%, 3%, 5%, 7%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50% or 55%; relative to In 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 III in the liquid crystal composition of the present invention is 50%, 45%, 40%, 35%, 30% or 25%.

In some embodiments of the present invention, the compound of general formula III accounts for 2%-50% by weight of the liquid crystal composition.

In some embodiments of the present invention, in order to improve contrast in particular, the compound of general formula III is preferably selected from the group consisting of compounds of general formula III-a and general formula III-d.

In some embodiments of the present invention, in particular, the compound of the general formula III also has the effect of improving the low temperature mutual solubility of the liquid crystal composition, and the liquid crystal composition comprising the compound of the general formula III 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 the compounds of general formula III-a, R ₂ preferably represents ethyl, propyl, butyl or pentyl.

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-a in the liquid crystal composition of the present invention is 0.1%, 1%, 2%, 3%, 5%, 7%, 10%, 12%, 15%, 17%, 20%, 23%, 25%, 27% or 30%; relative to the total weight of the composition of the present invention, the proportion of the compound of general formula III-a The preferred upper limit of the weight percentage of the liquid crystal composition of the present invention is 50%, 45%, 42%, 40%, 38%, 35%, 33%, 30%, 28%, 26%, 24%, 22% , 20%, 18%, 15%, 12%, 10% or 8%.

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 0%, 0.1%, 1%, 2%, 3% , 5%, 7% or 10%; 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 III-d in the liquid crystal composition of the present invention is 30%, 25 %, 20%, 19%, 17%, 15%, 13%, 10%, 8%, 7%, 6%, 5% or 3%.

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-b in the liquid crystal composition of the present invention is 0%, 1%, 3%, 5%, 8% , 10%, 15%, 17%, 20%, 23%, 25%, 27% or 30%; relative to the total weight of the composition of the present invention, the compound of the general formula III-b accounts for the liquid crystal composition of the present invention The preferred upper limit of the weight percentage of the material is 40%, 38%, 35%, 33%, 30%, 28%, 25%, 23%, 20%, 19%, 17%, 15%, 13%, 10% %, 8%, 7%, 6%, 5% or 3%.

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 0%, 1%, 3%, 5%, 8% , 10%, 15%, 17%, 20%, 23%, 25%, 27% or 30%; relative to the total weight of the composition of the present invention, the compound of the general formula III-c accounts for the liquid crystal composition of the present invention The preferred upper limit of the weight percentage of the material is 40%, 38%, 35%, 33%, 30%, 28%, 25%, 23%, 20%, 19%, 17%, 15%, 13%, 10% %, 8%, 7%, 6%, 5% or 3%.

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-e in the liquid crystal composition of the present invention is 0%, 1%, 3%, 5%, 8% , 10%, 15%, 17%, 20%, 23%, 25%, 27% or 30%; relative to the total weight of the composition of the present invention, the compound of the general formula III-e accounts for the liquid crystal composition of the present invention The preferred upper limit of the weight percentage of the material is 40%, 38%, 35%, 33%, 30%, 28%, 25%, 23%, 20%, 19%, 17%, 15%, 13%, 10% %, 8%, 7%, 6%, 5% or 3%.

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-f in the liquid crystal composition of the present invention is 0%, 1%, 3%, 5%, 8% , 10%, 15%, 17%, 20%, 23%, 25%, 27% or 30%; relative to the total weight of the composition of the present invention, the compound of the general formula III-f accounts for the liquid crystal composition of the present invention The preferred upper limit of the weight percentage of the material is 40%, 38%, 35%, 33%, 30%, 28%, 25%, 23%, 20%, 19%, 17%, 15%, 13%, 10% %, 8%, 7%, 6%, 5% or 3%.

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 0%, 1%, 3%, 5%, 8% , 10%, 15%, 17%, 20%, 23%, 25%, 27% or 30%; relative to the total weight of the composition of the present invention, the compound of the general formula III-g accounts for the liquid crystal composition of the present invention The preferred upper limit of the weight percentage of the material is 40%, 38%, 35%, 33%, 30%, 28%, 25%, 23%, 20%, 19%, 17%, 15%, 13%, 10% %, 8%, 7%, 6%, 5% or 3%.

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 0%, 1%, 3%, 5%, 8% , 10%, 15%, 17%, 20%, 23%, 25%, 27% or 30%; relative to the total weight of the composition of the present invention, the compound of the general formula III-h accounts for the liquid crystal composition of the present invention The preferred upper limit of the weight percentage of the material is 40%, 38%, 35%, 33%, 30%, 28%, 25%, 23%, 20%, 19%, 17%, 15%, 13%, 10% %, 8%, 7%, 6%, 5% or 3%.

In some embodiments of the present invention, in the compound of general formula M, R _M1 and R _M2 are each independently preferably a straight-chain or branched alkyl group containing 1-10 carbon atoms, containing 1-9 carbon atoms A linear or branched alkoxy group of atoms, a linear or branched alkenyl group containing 2 to 10 carbon atoms, or a linear or branched alkenyloxy group containing 2 to 10 carbon atoms; more preferably It is a linear or branched alkyl group containing 1 to 8 carbon atoms, a linear or branched alkoxy group containing 1 to 7 carbon atoms, or a linear or branched chain containing 2 to 8 carbon atoms alkenyl; further preferably a straight or branched alkyl group containing 1 to 5 carbon atoms, a straight or branched alkoxy group containing 1 to 5 carbon atoms, or a straight or branched alkoxy group containing 2 to 5 carbon atoms Atom straight or branched chain alkenyl.

In some embodiments of the present invention, preferably, one or both of R _M1 and R _M2 are straight-chain or branched alkenyl groups containing 2 to 8 carbon atoms; further preferably, R _M1 and R M2 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 straight-chain or branched alkenyl group containing 2 to 5 carbon atoms, and the other is a linear or branched alkenyl group containing 1 to 5 carbon atoms Atom of straight or branched chain alkyl.

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 an alkyl group containing 1 to 7 carbon atoms. Linear or branched alkoxy; further preferably, each independently is a linear or branched alkyl group containing 1 to 5 carbon atoms, or a linear or branched alkyl group containing 1 to 4 carbon atoms alkoxy.

In some embodiments of the present invention, preferably, one of R _M1 and R _M2 is a straight-chain or branched alkyl group containing 1 to 5 carbon atoms, and the other is an alkyl group containing 1 to 5 carbon atoms A straight-chain or branched-chain alkyl group of atoms, or a straight-chain or branched-chain alkoxy group containing 1 to 4 carbon atoms; further preferably, R _M1 and R _M2 are both independently containing 1 to 5 carbon atoms. A straight or branched chain alkyl group of 1 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 groups represented by any one of formula (V1) to formula (V9), 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 a 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 groups 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 a 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；

M20；以及

M21。In some embodiments of the invention, the compound of general formula M is selected from the group consisting of:

M1;

M2;

M3;

M4;

M5;

M6;

M7;

M8;

M9;

M10;

M11;

M12;

M13;

M14;

M15;

M16;

M17;

M18;

M19;

M20; and

M21.

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 suitability, drip marks, burn-in, dielectric anisotropy Make appropriate adjustments according to the required performance.

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 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 general formula M accounts for 1%-80% by weight of the liquid crystal composition.

In some embodiments of the invention, the compound of general formula M is particularly preferably selected from the group consisting of general formula M1, general formula M2, general formula M3, general formula M7, general formula M8, general formula M9, general formula M11, general formula M12 , general formula M13, general formula M14, general formula M17, general formula M18, general formula M19, general formula M20 and general formula M21 The group of compounds.

In some embodiments of the present invention, when reliability is important, general formula M1, general formula M2, general formula M3, general formula M7, general formula M8, general formula M9, general formula M11, general formula M12, general formula The group consisting of compounds of formula M13, general formula M14, general formula M17, general formula M18, general formula M19, general formula M20 and general formula M21 includes compounds in which both R _M1 and R _M2 are alkyl groups; In the case of volatility, general formula M1, general formula M2, general formula M3, general formula M7, general formula M8, general formula M9, general formula M11, general formula M12, general formula M13, general formula M14, general formula M17, The group of compounds of general formula M18, general formula M19, general formula M20 and general formula M21 includes compounds in which both R _M1 and R _M2 are alkoxy groups; and when emphasis is placed on viscosity reduction, general formula M1, general formula M2, general M3, general M7, general M8, general M9, general M11, general M12, general M13, general M14, general M17, general M18, general M19, general M20 and The group of compounds of the general formula M21 includes compounds in which at least one of R _M1 and R _M2 is an alkenyl group.

M1-a；

M1-b；

M1-c；

M1-d；

M1-e；

M1-f；

M1-g；以及

M1-h， 其中， R_M1 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 R_M11 和R_M21 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 M1 is particularly preferably selected from the group consisting of:

M1-a;

M1-b;

M1-c;

M1-d;

M1-e;

M1-f;

M1-g; and

M1-h, wherein, R _M1 represents a linear or branched alkyl or alkoxy group containing 1-8 carbon atoms, or a linear or branched alkenyl or alkenyl group containing 2-8 carbon atoms and R _M11 and R _M21 each independently represent a linear or branched alkyl or alkoxy group containing 1 to 8 carbon atoms.

Regarding the preferred weight percent of the compound of the general formula M1 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 weight percentage of the compound of the general formula M1 to the liquid crystal composition of the present invention is as follows Limits are 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 weight percentage of the compound of general formula M1 in the liquid crystal composition of the present invention is preferably 70%, 65%, 60%, 55%, 50%, 45%, 40%, 35%, 30% or 25%.

In some embodiments of the invention, the compound of general formula M1 is preferably selected from the group consisting of compounds of general formula M1-a and general formula M1-b.

In some embodiments of the present invention, R _M1 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 straight-chain 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 _M1 is ethyl or n-propyl in the compounds of general formula M1-a and general formula M1-b are particularly preferred.

Relative to the total weight of the liquid crystal composition of the present invention, in the compound of the general formula M1-a, R _M1 represents an ethyl or n-propyl compound in the liquid crystal composition of the present invention. The preferred lower limit of the weight percentage of the compound is 0% , 1%, 5%, 10%, 15%, 17%, 20%, 23%, 25%, 27% or 30%; relative to the total weight of the composition of the present invention, in the compound of general formula M1-a The preferred upper limit of the weight percentage of the compound represented by R _M1 representing ethyl or n-propyl 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, in the compound of general formula M1-b, R _M1 represents an n-propyl group, and the preferred lower limit of the weight percentage of 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 M1-b, R _M1 represents n-propyl compound, the proportion of the liquid crystal of the present invention is 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, in terms of clearing point, when it is required to obtain a higher clearing point by the compound of general formula M1, the compound of general formula M1 in which R _M1 represents a butyl group or a pentyl group is preferred; Further preferred is a compound in which R _M1 represents an n-butyl group or an n-pentyl group in the compound of the general formula M1.

Relative to the total weight of the liquid crystal composition of the present invention, in the compounds of general formula M1-a and/or general formula M1-b, R _M1 represents an n-butyl or n-pentyl group in the weight of the liquid crystal composition of the present invention The preferred lower limit of percentage is 0%, 1%, 3%, 5%, 8%, 10%, 15%, 17%, 20%, 23%, 25%, 27% or 30%; relative to the present invention The total weight of the composition, in the compound of general formula M1-a and/or general formula M1-b, R _M1 represents the preferred upper limit of the weight percentage of the compound of n-butyl or n-pentyl group in the liquid crystal composition of the present invention Values are 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 limits of the weight percentage of the compound of the general formula M1-c in the liquid crystal composition of the present invention are 0%, 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 percent of the compound of the general formula M1-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 limits of the weight percentage of the compound of the general formula M1-d in the liquid crystal composition of the present invention are 0%, 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 percent of the compound of the general formula M1-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 limits of the weight percentage of the compound of the general formula M1-e in the liquid crystal composition of the present invention are 0%, 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 percent of the compound of the general formula M1-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 M1-f in the liquid crystal composition of the present invention is 0%, 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 the general formula M1-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 limits of the weight percentage of the compound of the general formula M1-g in the liquid crystal composition of the present invention are 0%, 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 percent of the compound of the general formula M1-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 of general formula M1-f and/or general formula M1-g wherein R _M1 is ethyl or n-propyl are preferred.

Relative to the total weight of the liquid crystal composition of the present invention, the percentage by weight of the compound in which R _M1 is ethyl or n-propyl in the compounds of general formula M1-f and/or general formula M1-g accounts for the liquid crystal composition of the present invention The preferred lower limit is 0%, 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 , in the compounds of general formula M1-f and/or general formula M1-g, the preferred upper limit of the weight percent of the compound in which R _M1 is ethyl or n-propyl is 20%, 17% of the liquid crystal composition of the present invention , 15%, 13%, 10%, 8%, 7% or 6%.

In some embodiments of the present invention, R _M11 in the compound of general formula M1-h represents a linear or branched alkyl or alkoxy group containing 1 to 7 carbon atoms; more preferably, it contains 1 to 5 carbon atoms. A straight or branched chain alkyl or alkoxy group of carbon atoms.

Relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limits of the weight percentage of the compound of the general formula M1-h in the liquid crystal composition of the present invention are 0%, 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 M1-h accounts for the liquid crystal of the present invention The preferred upper limit of the weight percentage of the composition 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 in the compound of general formula M1-h, R _M11 is ethyl, n-propyl, butyl or pentyl, and R _M21 A compound of methyl or methoxy; a compound of the general formula M1-h wherein R _M11 is ethyl, n-propyl, butyl or pentyl, and R _M21 is an ethyl or ethoxy compound; or the general formula In the compounds of M1-h, R _M11 is n-propyl, butyl or pentyl, and R _M21 is n-propyl or propoxy.

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 _M11 is n-propyl and R _M21 is an ethyl group in the compound of the general formula M1-h accounts for the liquid crystal composition of the present invention The value is 0%, 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 M1 In the compound of -h, the preferred upper limit of the weight percentage of the compound in which R _M11 is n-propyl group and R _M21 is ethyl group in the liquid crystal composition of the present invention is 20%, 17%, 15%, 13%, 10% %, 8%, 7% or 6%.

Regarding the preferred weight percentage of the compound of general formula M2 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 weight percentage of the compound of general formula M2 in the liquid crystal composition of the present invention is as follows The limit is 0%, 1%, 2%, 3%, 5%, 7% or 10%; relative to the total weight of the liquid crystal composition of the present invention, the compound of the general formula M2 accounts for the total weight of the liquid crystal composition of the present invention The preferred upper limit of the weight percentage is 20%, 15%, 13%, 10%, 8%, 7%, 6%, 5% or 3%.

Regarding the preferred weight percentage of the compound of general formula M3 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 weight percentage of the compound of general formula M3 in the liquid crystal composition of the present invention is as follows The limit is 0%, 1%, 2%, 3%, 5%, 7% or 10%; relative to the total weight of the liquid crystal composition of the present invention, the compound of the general formula M3 accounts for the total weight of the liquid crystal composition of the present invention The preferred upper limit of the weight percentage is 20%, 15%, 13%, 10%, 8%, 7%, 6%, 5% or 3%.

Regarding the preferred weight percentage of the compound of general formula M7 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 general formula M7 in the liquid crystal composition of the present invention Values are 0%, 1%, 2%, 3%, 5%, 7%, 10%, 14%, 16%, 20%, 23%, 26%, 30%, 35%, or 40%; relative to this The total weight of the liquid crystal composition of the present invention, the weight percentage of the compound of the general formula M7 in the liquid crystal composition of the present invention is preferably 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 preferred that R _M1 in the compound containing the general formula M7 contains 2-4 carbon atoms The straight-chain or branched alkenyl group, and R _M2 is CH ₃ - compound, the straight-chain or branched alkenyl group containing 2-4 carbon atoms is more 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0%，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2%，3%，5%，7%，9%，11%，13%，15%，19%，24%或30%，並且優選上限值為45%，40%，35%，30%，25%，23%，20%，18%，15%、13%、11%、9%、7%或5%。With respect 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 whose R _M2 is CH ₃ - in the liquid crystal composition of the present invention is 0%, 1%, 3%, 5%, 7%, 9%, 11%, 12% , 13%, 18% or 21%, and preferably the upper limit 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 limits of the weight percent of the two compounds in the liquid crystal composition of the present invention are 2%, 3%, 5% %, 7%, 9%, 11%, 13%, 15%, 19%, 24% or 30%, and preferably the upper limit is 45%, 40%, 35%, 30%, 25%, 23%, 20%, 18%, 15%, 13%, 11%, 9%, 7% or 5%.

Regarding the preferred weight percentage of the compound of 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 weight percentage of the compound of general formula M8 in the liquid crystal composition of the present invention is as follows The limit is 0%, 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 general formula The preferred upper limit of the weight percentage of the compound of M8 in 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 R _M1 in the compound containing the general formula M8 contains 2-4 carbon atoms The straight-chain or branched alkenyl group, and R _M2 is CH ₃ - compound, the straight-chain or branched alkenyl group containing 2-4 carbon atoms is more 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0%，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%。With respect to the total weight of the liquid crystal composition of the present invention, R _M1 in the compound of the general formula M8 is

or

, and the preferred lower limit of the weight percentage of the compound whose R _M2 is CH ₃ - in the liquid crystal composition of the present invention is 0%, 1%, 3%, 4%, 5%, 7%, 9%, 11% , 12%, 13%, 18% or 20%, and preferably the upper limit 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 limits of the weight percentage of the two compounds in the liquid crystal composition of the present invention are 3%, 5%, 7%, 9%, 11%, 13%, 15%, 19%, 24% or 30%, and preferably the upper limit is 40%, 35%, 30%, 25%, 23%, 20%, 18% , 15% or 13%.

Regarding the preferred weight percentage of the compound of general formula M9 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 general formula M9 in the liquid crystal composition of the present invention Values are 0%, 1%, 2%, 3%, 5%, 7%, 10%, 14%, 16%, 20%, 23%, 26%, 30%, 35%, or 40%; relative to this The total weight of the liquid crystal composition of the present invention, the weight percentage of the compound of general formula M9 in the liquid crystal composition of the present invention is preferably 50%, 40%, 35%, 30%, 20%, 15%, 10%. % or 5%.

、

、

或

、且R_M2 為甲基、乙基或正丙基的化合物；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。In some embodiments of the present invention, the compound of general formula M9 is preferably a compound in which R _M1 is ethyl, propyl, butyl or pentyl, and R _M2 is methyl or ethyl; or preferably R _M1 is

,

,

or

, and the compound in which R _M2 is methyl, ethyl or n-propyl; or preferably the compound in which R _M1 is n-propyl, n-butyl or n-pentyl, and R _M2 is CH ₃ O-.

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 to the liquid crystal composition of the present invention Values are 0%, 1%, 2%, 3%, 5%, 7%, 10%, 14%, 16%, 20%, 23%, 26%, 30%, 35%, or 40%; relative to this The total weight of the liquid crystal composition of the present invention, the weight percentage of the compound of general formula M11 in the liquid crystal composition of the present invention is preferably 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 M11 is preferably a compound in which R _M1 and R _M2 each independently represent a linear or branched alkyl group containing 2 to 5 carbon atoms, or preferably R _M1 and R _M2 one of the

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 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 Values are 0%, 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 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 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 general formula M13 in the liquid crystal composition of the present invention Values are 0%, 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 preferred weight percentage of the compound of general formula M14 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 general formula M14 in the liquid crystal composition of the present invention Values are 0%, 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 M14 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 general formula M15 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 general formula M15 in the liquid crystal composition of the present invention Values are 0%, 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 M15 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 M17 to M21 in the liquid crystal composition of the present invention, preferably: relative to the total weight of the liquid crystal composition of the present invention, the compounds of the general formulas M17 to M21 account for the total weight of the liquid crystal composition of the present invention. The preferred lower limit of the weight percentage is 0%, 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 preferred upper limit of the compounds of general formula M17~M21 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 general formula A-1 having positive dielectric anisotropy:

; wherein, R _A1 represents a straight-chain or branched alkyl group containing 1-12 carbon atoms,

,

or

, 1 or non-adjacent 2 or more -CH ₂ - in the linear or branched alkyl group containing 1-12 carbon atoms can be independently replaced by -CH=CH-, -C≡ C-, -O-, -CO-, -CO-O- or -O-CO- is substituted, and the linear or branched alkyl group containing 1-12 carbon atoms,

,

or

One or more -H in can be respectively independently replaced by -F or -Cl; ring

and ring

represent independently

,

,

or

,in,

,

and

At most 1 -CH ₂ - can be replaced by -O-, single bond can be replaced by double bond in one or more rings,

and

One or more -H in one or more rings can be replaced by -CN, -F or -Cl, -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, haloalkyl or haloalkoxy containing 1-5 carbon atoms, containing 2-5 carbon atoms and n _A1 represents 0, 1, 2 or 3, and when n _A1 =2 or 3, the ring

Can be the same or different, Z _A11 can be the same or different.

In some embodiments of the present invention, the compound of general formula A-1 is preferably a compound whose absolute value of dielectric anisotropy is 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:

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

Regarding the weight percentage of the compound of general formula A-1 in the liquid crystal composition of the present invention, it is preferable to: relative to the total weight of the liquid crystal composition of the present invention, the weight percentage of the compound of general formula A-1 in the liquid crystal composition of the present invention The preferred lower limit values are 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 the 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 the group consisting of 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 group consisting of compounds of A-1-44.

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, and the like .

；

；

；

；

；

；

；

；

；

；

；

；以及

。Possible dopants which are preferably added to the liquid crystal compositions according to the invention are shown below.

;

;

;

;

;

;

;

;

;

;

;

;as well as

.

In some embodiments of the present invention, preferably, the dopant accounts for 0-5% by weight of the liquid crystal composition; more preferably, the dopant accounts for 0-1% by weight of the liquid crystal composition.

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 from 1 to 12.

Preferably, the light stabilizer is selected from the following light stabilizers:

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 0-1% of the total weight of the liquid crystal composition; Particularly preferably, the light stabilizer accounts for 0-0.1% by weight of the total 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 dielectric anisotropy Δε is in the range of 6-12 , preferably 7-11, more preferably 7.5-10.5, further 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, further preferably 0.09 _-0.105 ; the average elastic constant Kave 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 7 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, moderately high optical anisotropy, moderately high clearing point, high transmittance, good low temperature stability, and large _Kave , so that the liquid crystal display device comprising the liquid crystal composition of the present invention has higher contrast ratio, relatively less light scattering, and good display effect. In particular, in the liquid crystal composition of the present invention, when the compound of the general formula I is added, the liquid crystal composition has a higher transmittance, so the compound of the general formula I can improve the transmittance of the liquid crystal composition, so that the compound of the general formula I can improve the transmittance of the liquid crystal composition. The liquid crystal display device of the liquid crystal composition has a higher contrast ratio; and when the compound of the general formula III is added, the low temperature mutual solubility of the liquid crystal composition can be improved. The inventors of the present invention have surprisingly found that the liquid crystal composition of the present invention comprising the compounds of general formula I, general formula II, general formula III, and general formula M can obtain a larger average elastic constant _Kave , which can make The liquid crystal display device of the present invention obtains relatively less light scattering and higher contrast, so the liquid crystal composition of the present invention can enable the liquid crystal display device to obtain a good display effect.

The present invention will be described below with reference to specific embodiments. It should be noted that the following embodiments are examples of the present invention, and are only used to illustrate the present invention, but not to limit the present invention. Other combinations and various modifications within the inventive concept can be made without departing from the spirit or scope of the inventions.

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

The abbreviated code names of the test projects in the following examples are as follows:

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

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℃, 1 KHz, test box is TN90 type, box 7 μm thick.

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

(K ₁₁ +K ₂₂ +K ₃₃ ).

Test conditions for T transmittance: use DMS 505 tester to test the transmittance of the dimming device at a clearing point of ±10°C, and the dimming device cell thickness is an IPS type liquid crystal test cell 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 each of the resulting liquid crystal compounds has been tested to meet electronic compound standards.

The liquid crystal compositions were prepared according to the proportions of the liquid crystal compositions specified in the following examples. The preparation of the liquid crystal composition is carried out according to conventional methods in the art, such as heating, ultrasonic waves, suspension, etc., by mixing in a prescribed ratio.

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

Comparative ratio 1

The liquid crystal composition of Comparative Example 1 was prepared according to the compounds and the weight percentages listed in Table 2, and the liquid crystal composition 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 the 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 the 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

It can be seen from the above Comparative Example 1 and Examples 1-5 that the liquid crystal composition provided by the present invention has high dielectric anisotropy, suitably high optical anisotropy, suitably high clearing point, high transmittance, good The low temperature stability and the larger _Kave enable the liquid crystal display device comprising the liquid crystal composition of the present invention to have higher contrast ratio, relatively less light scattering, and good display effect.

The above embodiments are only intended to illustrate the technical concept and characteristics of the present invention, and their purpose is to allow those who are familiar with the technology to understand the content of the present invention and implement it, and cannot limit the scope of protection of the present invention. Equivalent changes or modifications made should be covered within 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 straight-chain or branched alkyl group containing 1-12 carbon atoms,

,

or

, 1 or non-adjacent 2 or more -CH ₂ - in the linear or branched alkyl group containing 1-12 carbon atoms can be independently represented by -C=C-, -C≡ C-, -O-, -CO-, -CO-O- or -O-CO- is substituted, and the linear or branched alkyl group containing 1-12 carbon atoms,

,

or

One or more -H in the can be independently replaced by -F or -Cl; R ₂ represents a straight-chain or branched alkyl or alkoxy group containing 1-8 carbon atoms, or a 2-8 A linear or branched alkenyl or alkenyloxy group of carbon atoms; R _M1 and R _M2 each independently represent -H, a linear or branched alkyl group containing 1-12 carbon atoms, a group containing 2-12 straight-chain or branched alkenyl of carbon atoms,

,

or

, 1 or non-adjacent 2 or more -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; cyclic

,ring

,ring

and ring

represent independently

or

,in,

One or more -CH ₂ - can be replaced by -O-, single bond can be replaced by double bond in one or more rings,

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

,ring

and ring

represent independently

or

,in

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

At most one of -H may be substituted by halogen; Z ₁ and Z ₂ 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 ₃ independently represents a single bond, - CH ₂ CH ₂ -, -CF ₂ CF ₂ -, -CO-O-, -O-CO-, -O-CO-O-, -CH=CH-, -CF=CF-, -CH ₂ O- or -OCH ₂ -; 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 each independently represent -H, an alkyl group containing 1-3 carbon atoms, or a halogen; X represents a halogen, a halogenated alkyl group containing 1-5 carbon atoms or a halogenated alkoxy group, Haloalkenyl or haloalkenyloxy containing 2-5 carbon atoms; X _A2 represents halogen, haloalkyl or haloalkoxy containing 1-5 carbon atoms, haloalkene containing 2-5 carbon atoms group or haloalkenyloxy; X ₂₁ represents halogen, haloalkyl or haloalkoxy containing 1-5 carbon atoms, haloalkenyl or haloalkenyloxy containing 2-5 carbon atoms; X ₂₂ and X ₂₃ each independently represents -H, halogen, haloalkyl or haloalkoxy containing 1-3 carbon atoms, haloalkenyl or haloalkenyloxy containing 2-3 carbon atoms, wherein X ₂₂ and Only one of X ₂₃ represents H; n1 and n2 each independently represent 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

may be the same or different, Z ₂ may be the same or different; 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 _A21 and Z _A22 represent a single bond, n _A2 represents 1, a ring

express

,ring

Indicates that one or more -H may be replaced by -F or -Cl

, at least one of L _A21 , L _A22 , L _A23 and L _A24 is not -H; 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 the

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

;as well as

The liquid crystal composition as described in claim 1, wherein the ring

,ring

,ring

and ring

represent independently

,

The liquid crystal composition as described in item 1 or 2 of the claimed scope, wherein the compound of the 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 according to item 3 of the claimed scope, wherein the compound of formula I accounts for 0.1%-60% by weight of the liquid crystal composition. The liquid crystal composition as described in item 1 or 2 of the claimed scope, wherein the compound of the general formula II is selected from the group consisting of the following compounds:

;as well as

The liquid crystal composition according to item 5 of the claimed scope, wherein the compound of formula II accounts for 0.1%-80% by weight of the liquid crystal composition. The liquid crystal composition as described in item 1 of the claimed scope, wherein the compound of the general formula III is selected from the group consisting of the compound of the general formula III-a:

The liquid crystal composition according to claim 1 or 7 of the claimed scope, wherein the compound of formula III accounts for 2%-50% by weight of the liquid crystal composition. The liquid crystal composition according to item 1 of the claimed scope, wherein the compound of the general formula M is selected from the group consisting of the following compounds:

;as well as

The liquid crystal composition according to item 9 of the claimed scope, wherein the compound of the general formula M accounts for 1%-80% by weight of the liquid crystal composition. A display device comprising the liquid crystal composition according to any one of items 1 to 10 of the application scope.