TW202016266A - Liquid crystal composition and display device thereof having higher contrast, relatively less light scattering and an excellent display effect - Google Patents

Abstract

This invention provides a liquid crystal composition, the liquid crystal composition comprising: at least one compound of Formula I; at least one compound of Formula II; at least one compound of Formula III; and at least one compound of formula M. This invention also provides a display device containing the liquid crystal composition. The liquid crystal composition provided by the present invention has high dielectric anisotropy, properly high optical anisotropy, properly high clear and bright point, high transmittance, high transmittance, better low-temperature stability, and greater average elastic constant, such that the liquid crystal display device comprising the liquid crystal composition of the present invention has higher contrast, relatively less light scattering and an excellent display effect.

Description

Liquid crystal composition and its display device

The invention relates to the field of liquid crystal materials, in particular to liquid crystal compositions and display devices.

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. The liquid crystal display device uses the optical anisotropy and dielectric anisotropy of the liquid crystal material itself to work, and has been widely used at present. The operation modes of liquid crystal display elements based on liquid crystal molecules are classified as: 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 displays (LCD) have achieved rapid development due to their small size, light weight, low power consumption, and excellent display quality, and are especially 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 displays to be used for large-screen displays and eventually replace cathode ray tubes (Cathode Ray Tube, CRT), there are still some unsolved Problems, such as improving viewing angle characteristics, increasing response speed, increasing contrast, and increasing transmittance. The relatively narrow viewing angle of the LCD means that when viewed away from the normal to the normal direction of the liquid crystal cell, the contrast ratio decreases significantly, and when the viewing angle is large, grayscale and color inversion may occur, which seriously affects the display quality of the LCD.

The viewing angle of LCD is determined by the working principle of 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; otherwise, 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 from the normal direction of the display screen is different, so that the effective optical path difference △n*d is different at different viewing angles. However, the optimal optical path difference of the liquid crystal cell is designed to be perpendicular 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 will decrease. When the included angle is large enough At times, even the phenomenon of contrast inversion occurs.

At present, many methods for solving 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 (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 higher; OCB mode is difficult to maintain stable control with AC voltage , The transmittance of the three monochromatic lights of R, G, B is also different. In addition, in the absence of field, the molecules in the liquid crystal cell are arranged parallel to the direction of the substrate. Add a few seconds of voltage to preset, and then maintain this arrangement at a lower voltage, which is inconvenient to use; IPS mode only requires a linear polarizer and no compensation film, but its response speed is too slow. Cannot display fast moving pictures. Because the production of IPS mode and FFS mode is simple and has a wide viewing angle, they have become the most attractive way to improve viewing angle characteristics and achieve 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, which is characterized by a pair of electrodes fabricated on the same substrate, and another substrate 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 the transverse field mode. In the IPS mode, nematic liquid crystal molecules are evenly 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 becomes dark. When the electric field is applied, the liquid crystal molecules rotate to cause a delay, so light leaks from the two orthogonal polarizers. The advantages of using the IPS mode panel are a large viewing angle and accurate color reproduction, but the disadvantages are more serious light leakage, slower response speed, and greater energy consumption.

With the wide application of TFT LCDs, the performance requirements are constantly increasing. The high display image quality requires a 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 the liquid crystal material needs to have higher contrast and transmittance, higher elasticity coefficient, higher dielectric constant and low-temperature reliability, and the improvement of these properties requires improvement of the liquid crystal material.

（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 IPS mode transmittance formula Transmittance (transmittance, T) ∝|Δε|/ε _⊥ (“∝” represents the “inverse proportion” relationship, ε _⊥ represents the dielectric constant perpendicular to the molecular axis), if you want to increase the liquid crystal’s 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 be tilted in the Z-axis direction under the action of the vertical component of the fringe electric field, causing their optical anisotropy Δn to change, according to the formula

(Among them, 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, if you want to increase the positive The transmittance of the 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 light leakage in liquid crystal display devices are: LC scattering, rubbing uniformity, and color filter light leakage (CF/TFT scattering) and polarization ability (polarization ability), as shown in Figure 1, where light scattering accounts for 63% of the factors affecting light leakage.

Fig. 1 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, we need to increase the average elastic constant K _ave (where,

) To improve light scattering; in the case of increasing K _ave , 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 is the change in L ₀ that should significantly affect CR. In the off state, L ₀ has nothing to do with the dielectric of the liquid crystal molecules, and it is related to the LC scattering of the liquid crystal material itself. The smaller the LC scattering, the smaller the L ₀ , and the contrast (CR) will be Significantly improved.

In view of the above, the common methods for increasing the transmittance of liquid crystal materials can be considered from the following two aspects: (1) keeping the dielectric anisotropy Δε of the liquid crystal composition unchanged, by increasing ε _⊥ , the transmittance can be effectively improved (2) Increase the value of the average elastic constant K _ave of the liquid crystal composition to make the liquid crystal molecules have a better degree of order and less light leakage, thereby increasing the transmittance. In view of the shortcomings of the current liquid crystal composition, the present invention provides a liquid crystal composition with good performance, especially a liquid crystal composition with high transmittance, high elastic constant and good low temperature stability.

Object of the invention: The object of the present invention is to provide a high dielectric anisotropy, a suitably high optical anisotropy, a suitably high clearing point, a high transmittance, a high transmittance, good low temperature stability, and Larger _Kave liquid crystal composition. An object of the present invention is also to provide a liquid crystal display device containing 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 Solution of the Invention: In order to achieve the above object of the invention, the 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 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

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

,

or

One or more -H in each may be independently substituted with -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 of 12 carbon atoms, one or non-adjacent two or more -CH ₂ -of the straight-chain or branched alkyl group containing 1-12 carbon atoms 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 in each 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, Straight or branched alkenyl 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 -C≡C-, -O- , -CO-, -CO-O- or -O-CO- alternative; ring

,ring

,ring

And ring

Express independently

or

,among them,

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

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

,ring

And ring

Express independently

or

,among them

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 -; each of Z _A21 and Z _A22 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 independent Ground represents -H, alkyl group containing 1-3 carbon atoms, or halogen; X represents halogen, halogenated alkyl group or halogenated alkoxy group containing 1-5 carbon atoms, 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 each Independently represent 0, 1 or 2, and 0≤n1+n2≤3, and when n1=2, the ring

May be the same or different, Z ₁ may be the same or different, when n2=2, the ring

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

May be the same or different, Z _A21 may 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, ring

And ring

Not simultaneously 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 the said

, N _A2 represents 1.

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

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

In some embodiments of the 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 formula I is necessary according to the solubility at low temperature, transition temperature, electrical reliability, transmittance, contrast, birefringence, process adaptability, drip marks, burn-in screen , Dielectric anisotropy and other required performance and suitable adjustment.

With respect to the weight percentage of the compound of the general formula I in the liquid crystal composition of the present invention, it is preferable that the weight percentage of the compound of the general formula I in the liquid crystal composition of the present invention is a lower limit relative to the total weight of the liquid crystal composition of the present invention The 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 upper limit of the weight percentage of the compound of formula I in the liquid crystal composition of the present invention is preferably 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 comprises 0.1% to 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 linear or branched alkyl or alkoxy group containing 1-8 carbon atoms, a group containing 2-8 carbon atoms Straight-chain or branched alkenyl or alkenyloxy; more preferably straight-chain or branched alkyl or alkoxy containing 1-5 carbon atoms, straight-chain or branched chain containing 2-5 carbon atoms Of alkenyl or alkenyloxy.

和環

各自獨立地表示

、

、

、

、

、

、

、

、

、

、

、

、

、

、

、

、

或

。In some embodiments of the invention, the ring

And ring

Express 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 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 to I-9 and general formula I-11; further preferably Contains 2 to 10 compounds of general formula I-1 ~ I-9, 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, general formula I-9; further preferably Contains 2 to 10 compounds of general formula I-1 ~ I-8, 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 the general formula I; more preferably contains at least two compounds of the 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 Formula I-1 to Formula I-12 are preferably selected from the group consisting of:

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

In some embodiments of the 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 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 formula II, R _A2 is preferably a linear or branched alkyl or alkoxy group containing 1-8 carbon atoms, a group containing 2-8 carbon atoms Straight-chain or branched alkenyl or alkenyloxy group; more preferably straight-chain or branched alkyl or alkoxy group containing 1-5 carbon atoms, straight-chain or branched chain containing 2-5 carbon atoms Of alkenyl or alkenyloxy.

和環

各自獨立地表示

、

、

、

、

、

、

、

、

、

、

、

、

、

、

、

、

或

。In some embodiments of the invention, the ring

And ring

Express 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；

Ⅱ-43；以及

Ⅱ-44。In some embodiments of the 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;

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 the general formula II; more preferably contains at least one compound of the general formula II-1 to II-3, II-15 to II-20, II- 24. Compounds of Ⅱ-26, Ⅱ-28~Ⅱ-44; more preferably containing 2 to 12 kinds of 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 Compounds of -44; still more preferably compounds containing 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 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. Formula II-17, Formula II-23, Formula II-24, Formula II-26, Formula II-27, Formula II-28, Formula II-29, Formula II-34 and Group consisting of compounds of general formula II-44.

With respect to the weight percentage of the compound of the general formula II in the liquid crystal composition of the present invention, the lower limit of the weight percentage of the compound of the general formula II in the liquid crystal composition of the present invention is preferably relative to the total weight of the composition of the invention The 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 upper limit of the weight percentage of the compound of the general formula II in the liquid crystal composition of the present invention is preferably 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 constitutes 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 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 it is necessary to keep the clearing point of the liquid crystal composition of the present invention high and the temperature stability is good, it is preferable that the lower limit of the content of general formula II is 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, when the dielectric anisotropy is increased in order to keep the driving voltage low, it is preferable to increase the lower limit value of the content of Formula II and the upper limit value, and the lower limit value is preferred 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 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; and

Ⅲ-g; and

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

With respect to the weight percentage of the compound of the general formula III in the liquid crystal composition of the present invention, the weight percentage of the compound of the 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 Limits are 0.1%, 1%, 2%, 3%, 5%, 7%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50% or 55% With respect 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 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 general formula III accounts for 0.1%-70% by weight of the liquid crystal composition.

In some embodiments of the 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 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 compounds of formula III-a and/or formula III-b, and compounds of formula III-h may be such that 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 preferably 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, the compounds of the general formula III-a and the general formula III-b in which R ₂ is ethyl or n-propyl are particularly preferred.

With respect to the total weight of the liquid crystal composition of the present invention, in the compound of the general formula III-a, R ₂ represents an ethyl or n-propyl compound. The preferred lower limit of the weight percentage of the liquid crystal composition of the present invention is 1% , 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 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%.

With respect to the total weight of the liquid crystal composition of the present invention, the lower limit of the weight percentage of the compound of the general formula III-b where R ₂ represents n-propyl group in the liquid crystal composition of the present invention is preferably 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 III-b R ₂ represents n-propyl compounds accounted 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 the general formula III, it is preferred that the compound of the general formula III R ₂ represents a butyl or pentyl compound; further It is preferred that the compound of formula III wherein R ₂ represents n-butyl or n-pentyl.

With respect to the total weight of the liquid crystal composition of the present invention, in the compound of the general formula III-a and/or the general formula III-b, R ₂ represents the weight of the liquid crystal composition of the present invention in the compound represented by n-butyl or n-pentyl 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 compounds of the general formula III-a and/or the general formula III-b R ₂ represents n-butyl or n-pentyl compounds of the liquid crystal composition of the present invention, the preferred upper limit is 60 %, 55%, 50%, 45%, 42%, 40%, 38%, 35%, 33%, 30%, 28%, 25%, 23% or 20%.

With respect 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-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 formula III-c in the liquid crystal composition of the present invention is 25%, 23%, 20 %, 17%, 15%, 13% or 10%.

With respect 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-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 the general formula III-d in the liquid crystal composition of the present invention is 25%, 23%, 20 %, 17%, 15%, 13% or 10%.

With respect 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 upper limit of the weight percentage of the compound of the general formula III-e in the liquid crystal composition of the present invention is preferably 25%, 23%, 20 %, 17%, 15%, 13% or 10%.

With respect 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 the general formula III-f in the liquid crystal composition of the present invention is 25%, 23%, 20 %, 17%, 15%, 13% or 10%.

With respect 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-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 the 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 invention, preference is given to compounds of formula III-f and/or formula III-g wherein R ₂ is n-propyl.

With respect to the total weight of the liquid crystal composition of the present invention, among the compounds of the general formula III-f and/or the general formula III-g, the compound wherein R ₂ is n-propyl group preferably accounts for the weight percentage of the liquid crystal composition of the present invention The limits are 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 compound of the general formula III-g wherein R ₂ is n-propyl compound accounts for the liquid crystal composition of the present invention, the preferred upper limit 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 general formula III-h each independently represent a linear or branched alkyl or alkoxy group containing 1 to 7 carbon atoms, further preferably Straight or branched chain alkyl or alkoxy groups containing 1 to 5 carbon atoms.

With respect 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-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 accounted for 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 in the compound of general formula III-h, R ₂₁ is ethyl, n-propyl, butyl or pentyl, and R ₃₁ Compounds that are methyl or methoxy, in compounds of general formula III-h where R ₂₁ is ethyl, n-propyl, butyl or pentyl, and R ₃₁ is ethyl or ethoxy, or 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.

With respect to the total weight of the liquid crystal composition of the present invention, among the compounds of the 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%; relative to The total weight of the liquid crystal composition of the present invention, the compound of the general formula III-h R ₂₁ is ethyl, n-propyl, butyl or pentyl, and R ₃₁ is a compound of 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%.

With respect to the total weight of the liquid crystal composition of the present invention, among the compounds of the 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%; relative to The total weight of the liquid crystal composition of the present invention, the compound of the general formula III-h R ₂₁ is ethyl, n-propyl, butyl or pentyl, and R ₃₁ is ethyl or ethoxy compounds accounted 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%.

With respect to the total weight of the liquid crystal composition of the present invention, among the compounds of the general formula III-h, R ₂₁ is n-propyl, butyl, or pentyl, and R ₃₁ is n-propyl or propoxy. 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 of the compound of the general formula III-h R ₂₁ is n-propyl, butyl or pentyl, and R ₃₁ is n-propyl or propoxy compound accounted for the liquid crystal composition of the present invention The preferred upper limit of the weight percentage 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 chains containing 1 to 9 carbon atoms. A chain or branched alkoxy group, or a linear or branched alkenyl group containing 2 to 10 carbon atoms; more preferably a linear or branched alkyl group containing 1 to 8 carbon atoms, containing 1 to A linear or branched alkoxy group of 7 carbon atoms, or a linear or branched alkenyl group containing 2 to 8 carbon atoms; still more preferably a linear or branched chain containing 1 to 5 carbon atoms Alkyl group, linear or branched alkoxy group containing 1 to 4 carbon atoms, or linear or branched 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 straight-chain 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, while the other means containing 1 to 5 carbons Atom straight or branched chain alkyl.

In some embodiments of the 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 group containing 1 to 7 carbon atoms Linear or branched alkoxy; further preferably, both R _M1 and R _M2 are each independently a linear or branched alkyl group containing 1 to 5 carbon atoms, or containing 1 to 4 carbons Atom straight or branched chain alkoxy.

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 1 to 5 carbons Linear or branched alkyl groups of atoms, or linear or branched alkoxy groups containing 1 to 4 carbon atoms; further preferably, both R _M1 and R _M2 independently contain 1 to 5 Straight-chain or branched-chain alkyl group with one carbon atom.

， 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 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 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 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; and

M20.

In some embodiments of the present invention, the content of the compound of general formula M must depend on the solubility at low temperature, transition temperature, electrical reliability, birefringence, process adaptability, dripping traces, screen burn, dielectric Adjust the performance required for the opposite sex.

With respect 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 upper limit of the weight percentage of the compound of formula M in the liquid crystal composition of the present invention is preferably 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 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 M6, general formula M7, general formula M8, general formula M10, general formula M11, general formula M12 , Formula M13, Formula M16, Formula M17, Formula M18, Formula M19 and Formula M20.

In some embodiments of the present invention, when reliability is valued, 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 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 both R _M1 and R _M2 are alkyl groups; , 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 general formula M19 and general formula M20 includes compounds in which both R _M1 and R _M2 are alkoxy groups; and when importance is given to viscosity reduction, general formula M1, general formula M2, general formula M6, general formula M7, Formula M8, Formula M10, Formula M11, Formula M12, Formula M13, Formula M16, Formula M17, Formula M18, Formula M19 and Formula M20 include R _M1 And at least one of R _M2 is an alkenyl group.

With respect 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 weight percentage of the compound of the general formula M1 in the liquid crystal composition of the present invention is preferred The upper limit is 20%, 15%, 13%, 10%, 8%, 7%, 6%, 5% or 3%.

With respect to the weight percentage of the compound of the general formula M2 in 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 lower than the total weight of the liquid crystal composition of the present invention The limit value is 1%, 2%, 3%, 5%, 7% or 10%; 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 The upper limit is 20%, 15%, 13%, 10%, 8%, 7%, 6%, 5% or 3%.

With respect to the weight percentage of the compound of the general formula M6 in the liquid crystal composition of the present invention, it is preferably: relative to the total weight of the liquid crystal composition of the present invention, the lower limit of the weight percentage of the compound of the general formula M6 in the liquid crystal composition of the present invention is preferred Values are 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 upper limit of the weight percentage of the compound of the general formula M6 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 properties required for solubility at low temperature, transition temperature, electrical reliability, birefringence, etc., it is preferred that in compounds containing the general formula M6, R _M1 contains 2-4 carbon atoms The compound of the linear or branched alkenyl group, and R _M2 is CH ₃ -, the linear 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%。With respect 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

The preferred lower limit of the weight percentage of the compound of R _{M2 which} 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 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, with respect 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%, preferably the upper limit is 45%, 40%, 35%, 30%, 25%, 23%, 20%, 18 %, 15%, 13%, 11% or 9%.

With respect to the weight percentage of the compound of the general formula M7 in 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 lower than the total weight of the liquid crystal composition of the present invention The limits are 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 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 properties required for solubility at low temperature, transition temperature, electrical reliability, birefringence, etc., it is preferred that in compounds containing the general formula M7, R _M1 contains 2-4 carbon atoms The compound of the linear or branched alkenyl group, and R _M2 is CH ₃ -, the linear 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 M7 is

or

The preferred lower limit of the weight percentage of the compound of R _{M2 which} 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 preferably the 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, with respect 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%.

With respect to the weight percentage of the compound of the general formula M8 in the liquid crystal composition of the present invention, it is preferably: the lower limit of the 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 Values are 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 upper limit of the weight percentage of the compound of the general formula M8 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 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, 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 C ₂ H ₅ -compound.

Regarding the weight percentage of the compound of the general formula M10 in the liquid crystal composition of the present invention, it is preferably: the lower limit of the 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 Values are 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 upper limit of the weight percentage of the compound of the general formula M10 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 compounds of the general formula M10 preferably R _M1 and R _M2 each independently represent a compound having a straight-chain or branched alkyl group containing 2-5 carbon atoms, or preferably R _M1 and R _M2 One of

or

And the other is a CH ₃ -or C ₂ H ₅ -compound.

Regarding the weight percentage of the compound of the general formula M11 in the liquid crystal composition of the present invention, it is preferably: the lower limit of the 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 Values are 1%, 2%, 3%, 5%, 7%, 10%, 12%, 14%, 16%, 18%, 20%, 23%, 26%, 30%, 35% or 40%; With respect 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 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%.

With respect to the weight percentage of the compound of the general formula M12 in the liquid crystal composition of the present invention, it is preferably: the lower limit of the 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 Values are 1%, 2%, 3%, 5%, 7%, 10%, 12%, 14%, 16%, 18%, 20%, 23%, 26%, 30%, 35% or 40%; With respect 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 weight percentage of the compound of the general formula M13 in the liquid crystal composition of the present invention, it is preferably: the lower limit of the 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 Values are 1%, 2%, 3%, 5%, 7%, 10%, 12%, 14%, 16%, 18%, 20%, 23%, 26%, 30%, 35% or 40%; With respect 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%.

With respect to the weight percentage of the compounds of the general formula M16 to M20 in the liquid crystal composition of the present invention, it is preferred that the compounds of the general formula M16 to M20 account for the total of 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 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 compound of ~M20 to 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:

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

,

or

, The linear or branched alkyl group containing 1-12 carbon atoms, one or two or more non-adjacent -CH ₂ -can be independently -CH=CH-, -C≡ C-, -O-, -CO-, -CO-O- or -O-CO-, and the linear or branched alkyl group containing 1-12 carbon atoms,

,

or

One or more -H in each may be independently substituted with -F or -Cl; ring

And ring

Express independently

,

,

or

,among them,

,

with

At most 1 -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 may be replaced by -CN, -F or -Cl, and one or more rings -CH= may be replaced by -N=; 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 or halogenated alkoxy group containing 1-5 carbon atoms, containing 2-5 carbon atoms Haloalkenyl or haloalkenyloxy; and n _A1 represents 0, 1, 2 or 3, and when n _A1 = 2 or 3, the ring

May be the same or different, and Z _A11 may be the same or different.

In some embodiments of the invention, the compound of 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 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, one of the linear or branched alkyl groups containing 1-12 carbon atoms Or two or more non-adjacent -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 the general formula A-1 in the liquid crystal composition of the present invention, it is preferably: the weight percentage of the compound of the general formula A-1 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 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 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 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, Formula A-1-24, Formula A-1-27, Formula A-1-30, Formula A-1-31, Formula A-1-35, Formula A-1-40 and Formula A-1-44 group of compounds.

In addition to the above-mentioned compounds, the liquid crystal composition of the present invention may contain general nematic liquid crystal, smectic liquid crystal, cholesteric liquid crystal, antioxidant, ultraviolet absorber, infrared absorber, polymerizable monomer, light stabilizer, etc. .

；

；

；

；

；

；

；

；

；

；

；

；以及

。The following shows possible dopants 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 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% 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, further preferably 90-110°C; the range of 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, further preferably 0.09-0.11, further 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 including the above liquid crystal composition.

Advantageous effects: The liquid crystal composition provided by the present invention has high dielectric anisotropy, moderately high optical anisotropy, moderately high clearing point, high transmittance, high transmittance, good low-temperature stability, and The larger average elastic constant K _ave makes the liquid crystal display device containing the liquid crystal composition of the present invention have higher contrast, relatively less light scattering, and good display effect. In particular, in the liquid crystal composition of the present invention, when the compound of formula I is added, the liquid crystal composition has a higher transmittance, so the compound of 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 have surprisingly found that by including compounds of general formula I, general formula II, general formula III, and 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 , thereby allowing the liquid crystal display device including the liquid crystal composition of the present invention to obtain relatively less light scattering and a 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. Other combinations and various improvements within the concept of the present invention can be made without departing from the gist or scope of the present invention.

The liquid crystal displays used in the following embodiments are all TFT liquid crystal display devices, and the cell thickness is 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 codes of liquid crystal compounds

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 following structural formula as an example:

If the structural formula is represented by the code listed in Table 1, it can be expressed as: nCCGF, n in the code represents the number of C atoms of the left 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 items 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 dielectric constant parallel to the molecular axis, ε _⊥ is the dielectric constant perpendicular to the molecular axis, test conditions: 25℃, 1 KHz, the test box is TN90 type, box 7 μm thick.

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

(K ₁₁ +K ₂₂ +K ₃₃ ).

Test condition of T transmittance: DMS 505 tester was used to test the transmittance of the dimming device at a clear point of ±10°C. The dimming device cell thickness was 3.5 μm IPS type liquid crystal test cell.

Each component used in the following examples can be synthesized by a well-known method or obtained through a commercial route. These synthesis techniques are conventional, and the resulting liquid crystal compounds have been tested to meet the standards for 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 according to a conventional method in the art, such as heating, ultrasonic waves, suspension, etc. 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 example 1

The liquid crystal composition of Comparative Example 1 was prepared according to each compound and weight percentage listed in Table 2, which was filled between two substrates of a liquid crystal display for performance test. Table 2 Liquid crystal composition formulation and performance parameter test

Examples 1

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

Examples 2

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

Examples 3

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

Examples 4

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

Examples 5

The liquid crystal composition of Example 5 was prepared according to the compounds and weight percentages listed in Table 7, which was filled between the two substrates of the liquid crystal display for performance testing. Table 7 Liquid crystal composition formulation 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, and high Transmittance, good low-temperature stability, and large _Kave make the liquid crystal display device including the liquid crystal composition of the present invention have higher contrast, relatively less light scattering, and good display effect.

The above embodiments are only for explaining the technical concept and features of the present invention. The purpose is to allow those familiar with the technology to understand and implement the content of the present invention, and cannot limit the scope of protection of the present invention. The equivalent changes or modifications made should be covered in the protection scope of the present invention.

Claims (12)

A liquid crystal composition comprising: 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

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

,

or

One or more -H in each may be independently substituted with -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 of 12 carbon atoms, one or non-adjacent two or more -CH ₂ -of the straight-chain or branched alkyl group containing 1-12 carbon atoms 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 in each 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, Straight or branched alkenyl 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 -C≡C-, -O- , -CO-, -CO-O- or -O-CO- alternative; ring

,ring

,ring

And ring

Express independently

or

,among them,

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

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

,ring

And ring

Express independently

or

,among them

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 -; each of Z _A21 and Z _A22 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 independent Ground represents -H, alkyl group containing 1-3 carbon atoms, or halogen; X represents halogen, halogenated alkyl group or halogenated alkoxy group containing 1-5 carbon atoms, 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 each Independently represent 0, 1 or 2, and 0≤n1+n2≤3, and when n1=2, the ring

May be the same or different, Z ₁ may be the same or different, when n2=2, the ring

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

May be the same or different, Z _A21 may 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, ring

And ring

Not simultaneously 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 the said

, N _A2 represents 1. The liquid crystal composition as described in item 1 of the patent application, in which the ring

,ring

,ring

And ring

Express independently

,

,

,

,

,

,

,

,

,

,

,

,

,

,

,

,

or

. The liquid crystal composition as described in item 1 or 2 of the patent application, wherein 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. The liquid crystal composition as described in item 3 of the patent application range, wherein the compound of formula I accounts for 0.1% to 60% by weight of the liquid crystal composition. The liquid crystal composition according to item 1 or 2 of the patent application scope, wherein the compound of the 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;

Ⅱ-43; and

Ⅱ-44. The liquid crystal composition as described in item 5 of the patent application range, wherein the compound of the general formula II accounts for 0.1%-80% by weight of the liquid crystal composition. The liquid crystal composition according to item 1 of the patent application scope, wherein the compound of the 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;

Ⅲ-g; and

Ⅲ-h, where R ₂ represents a linear or branched alkyl or alkoxy group containing 1-8 carbon atoms, or a linear or branched alkenyl group or alkenyl oxide group containing 2-8 carbon atoms And R ₂₁ and R ₃₁ each independently represent a linear or branched alkyl or alkoxy group containing 1 to 8 carbon atoms. The liquid crystal composition as described in item 7 of the patent application scope, wherein the compound of the general formula III is free from the group consisting of:

Ⅲ-a;

Ⅲ-b; and

Ⅲ-h. The liquid crystal composition as described in item 7 or 8 of the patent application range, wherein the compound of formula III accounts for 0.1%-70% by weight of the liquid crystal composition. The liquid crystal composition according to item 1 of the patent application scope, wherein the compound of the 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; and

M20. The liquid crystal composition as described in item 10 of the patent application range, 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 claims 1-11.