TWI761718B - Liquid crystal composition with high transmittance and liquid crystal display device thereof - Google Patents

Abstract

The invention discloses a liquid crystal composition with high transmittance, the liquid crystal composition comprises: at least one compound of general formula I, at least one compound of general formula N, and at least one compound of general formula M. The invention also discloses a liquid crystal display device comprising the liquid crystal composition. The liquid crystal composition provided by the present invention has high dielectric anisotropy, large ε _⊥ , large vertical dielectric to dielectric ratio, low rotational viscosity, suitably high clearing point, and suitably high optical anisotropy , and large elastic constants K ₁₁ and K ₃₃ , which are especially suitable for IPS liquid crystal displays, which can improve the transmittance of the display, reduce the response time, and increase the contrast ratio.

Description

Liquid crystal composition with high transmittance and liquid crystal display device thereof

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

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 viewing angle of LCD is relatively narrow, which means that when the viewing angle is perpendicular to the normal direction of the liquid crystal cell, the contrast ratio is significantly reduced, and when the viewing angle is large, the phenomenon of grayscale and color inversion will occur, which seriously affects the display quality of the LCD, so the viewing angle problem It has become a major obstacle for LCD to replace CRT technology.

The viewing angle problem of LCD is determined by the working principle of liquid crystal. 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) mode and multi-domain vertical alignment (multi-vertical alignment, MVA) mode and so on. 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 have been experimentally investigated, which feature a pair of electrodes fabricated on the same substrate and the other on the other. 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 appears 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.

The IPS mode can use positive liquid crystal or negative liquid crystal. Since the driving voltage required for the transmittance to reach 100% decreases with the increase of the absolute value of Δε, the driving voltage required for the transmittance of positive liquid crystal to reach 100% It is lower than that of negative liquid crystal and has a faster response speed, but the transmittance of negative liquid crystal is better than that of positive liquid crystal, mainly due to the arrangement of liquid crystal molecules in the liquid crystal cell in positive and negative IPS modes. The difference is due to the different arrangement and rotation of the liquid crystal molecules when the power is applied. Due to the influence of the vertical electric field of the edge, the positive liquid crystal molecules will reduce the effective Δn*d, so under the power-on condition, the transmittance of the positive IPS mode will be lower than that of the negative IPS mode. Liquid crystal, the response speed will be very slow, so it is urgent to maximize the transmittance in the positive IPS mode.

（其中，χ即為液晶層光軸與偏光片光軸之間的夾角，Δn為光學各向異性，d為盒間距，λ為波長）可知，有效Δn*d會影響T，若要提高正性液晶的透過率，也可以考慮增大Δn*d，但每款產品的延遲量設計都是固定的。According to the transmittance formula of IPS mode, Transmittance (transmittance, T) ∝|Δε|/ε _⊥ (“∝” means “inverse proportional” relationship), if you want to increase the transmittance of positive liquid crystal, you can try to reduce the Δε of the liquid crystal medium, However, 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. 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.

In view of the above situation, the common ways to improve the transmittance of liquid crystal materials in positive IPS mode can be considered from the following two aspects: (1) keeping the dielectric anisotropy Δε of the liquid crystal composition unchanged, by increasing ε _⊥ Effectively improve the transmittance; (2) increase the value of the elastic constant K of the liquid crystal composition, so that the order of the liquid crystal molecules is better, and the light leakage is less, thereby improving the transmittance. The current technology is mainly improved by adding negative monomers to the positive liquid crystal components. However, adding negative monomers will slow down the response speed and deteriorate the reliability. In the currently published patents, ε _⊥ is not large enough, when ε _⊥ is large, the response is very slow, and the K value is not large enough. In view of some deficiencies of the current high-transmittance liquid crystal compositions, the present invention provides a liquid crystal composition doped with a negative monomer, which has the advantages of large _ε⊥ , large K value and high transmittance.

Purpose of the invention: In view of the defects of the prior art, the purpose of the present invention is to further increase the _ε⊥ and the elastic constant K value of the liquid crystal composition while maintaining the Δε unchanged, while maintaining a large vertical dielectric to dielectric ratio. , low rotational viscosity, suitable clearing point and suitable optical anisotropy, thereby providing a liquid crystal composition with higher transmittance and quick response. 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N的化合物

N；以及 至少一種通式M的化合物

M， 其中， R₁ 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； R_N1 和R_N2 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-CH＝CH-、-C≡C-、-O-、-CO-、-CO-O-或-O-CO-替代； 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、

、

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； 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_N1 和Z_N2 各自獨立地表示單鍵、-CO-O-、-O-CO-、-CH₂ O-、-OCH₂ -、-CH＝CH-、-C≡C-、-CH₂ CH₂ -、-(CH₂ )₄ -、-CF₂ O-、-OCF₂ -或-CF₂ CF₂ -； 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 和L₄ 各自獨立地表示-H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； 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_N1 和n_N2 各自獨立地表示0、1、2或3，且0≤n_N1 +n_N2 ≤3，且當n_N1 =2或3時，環

可以相同或不同，Z_N1 可以相同或不同，當n_N2 =2或3時，環

可以相同或不同，Z_N2 可以相同或不同；並且 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。 Technical solution of the present invention: In order to achieve the above purpose of the invention, the present invention provides a liquid crystal composition with high transmittance, comprising: at least one compound of general formula I

I; at least one compound of the general formula N

N; and at least one compound of formula M

M, wherein, R ₁ 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 -Hs in can be independently replaced by -F or -Cl; R _N1 and R _N2 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 replaced by -CH=CH-, -C≡ C-, -O-, -CO-, -CO-O- or -O-CO- substitution; R _M1 and R _M2 each independently represent -H, straight or branched chain containing 1-12 carbon atoms alkyl,

,

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- 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 , 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 _N1 and Z _N2 each independently represents a single bond, -CO-O-, -O-CO-, -CH ₂ O-, -OCH ₂ -, -CH=CH-, -C≡C-, -CH ₂ CH ₂ -, -( CH ₂ ) ₄ -, -CF ₂ O-, -OCF ₂ - or -CF ₂ CF 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 and L ₄ are each independently represents -H or halogen; X represents halogen, haloalkyl or haloalkoxy containing 1-5 carbon atoms, haloalkenyl or haloalkenyloxy containing 2-5 carbon atoms; n1 and n2 are each independently Represents 0, 1 or 2, and 0≤n1+n2≤3, and when n1=2, the ring

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

may be the same or different, Z ₂ may be the same or different; n _N1 and n _N2 each independently represent 0, 1, 2 or 3, and 0≤n _N1 +n _N2 ≤3, and when n _N1 =2 or 3, ring

Can be the same or different, Z _N1 can be the same or different, when n _N2 = 2 or 3, the ring

may be the same or different, Z _N2 may be the same or different; and 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.

In some embodiments of the present invention, the compound of formula I has positive dielectric anisotropy and the compound of formula N has negative dielectric anisotropy.

In some embodiments of the present invention, the compound of formula M has an absolute value of dielectric anisotropy of no more than 3.

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, birefringence, process suitability, drip marks, burn-in, dielectric anisotropy It can be adjusted appropriately according to the performance required by the opposite sex.

Regarding the preferred content of the compound of the general formula I: with respect to the total weight of the liquid crystal composition of the present invention, the lower limit of the preferred content of the compound of the general formula I is 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 liquid crystal composition of the present invention The upper limit of the preferred content of the compound of general formula I is 60%, 55%, 50%, 45%, 40%, 35%, 30%, 28%, 27%, 26%, 25.5%, 25%, 24.5%, 24%, 22% or 20%.

和環

優選為

、

、

、

、

、

、

、

或

。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; ring

and ring

preferably

,

,

,

,

,

,

,

or

.

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， L₁ 、L₂ 、L₅ 、L₆ 和L₇ 各自獨立地表示-H或-F； L₄ 表示-H或-CH₃ ； n1表示0或1；並且 R_x 、R_y 和R_z 各自獨立地表示-CH₂ -或-O-。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 ₁ , L ₂ , L ₅ , L ₆ and L ₇ each independently represent -H or -F; L ₄ represents -H or -CH ₃ ; n1 represents 0 or 1; and R _x , R _y and R _z each independently represent -CH ₂ - or -O-.

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; further preferably contains 2 to 10 kinds of compounds Compounds of general formulas I-1 to I-8.

In some embodiments of the present invention, the liquid crystal composition of the present invention preferably contains at least two compounds of general formula I, wherein one compound of general formula I is selected from the compounds of general formula I-1~I-8, and the other general formula The compound of formula I is selected from the compounds of general formula I-9 to I-12.

和環

優選為

、

、

、

、

、

、

、

或

。In some embodiments of the present invention, in the compound of general formula N, R _N1 and R _N2 are each independently preferably straight or branched chain alkyl or alkoxy containing 1-8 carbon atoms, containing 2 -A straight-chain or branched alkenyl or alkenyloxy group of 8 carbon atoms; further preferably a straight-chain or branched alkyl or alkoxy group containing 1-5 carbon atoms, containing 2-5 carbon atoms The straight-chain or branched alkenyl or alkenyloxy group; R _N1 is further preferably a straight-chain or branched alkyl group containing 1-5 carbon atoms, or a straight-chain or branched chain containing 2-5 carbon atoms The alkenyl group is further preferably a straight-chain or branched alkyl group containing _2-5 carbon atoms or a straight-chain or branched alkenyl group containing 2-3 carbon atoms; Linear or branched alkoxy of 4 carbon atoms; cyclic

and ring

preferably

,

,

,

,

,

,

,

or

.

N1；

N2；

N3；

N4；

N5；

N6；

N7；

N8；

N9；

N10；

N11；

N12；

N13；

N14；

N15；

N16；

N17；

N18；

N19；

N20；

N21；以及

N22。In some embodiments of the present invention, the compound of general formula N is selected from the group consisting of:

N1;

N2;

N3;

N4;

N5;

N6;

N7;

N8;

N9;

N10;

N11;

N12;

N13;

N14;

N15;

N16;

N17;

N18;

N19;

N20;

N21; and

N22.

In some embodiments of the present invention, the liquid crystal composition of the present invention preferably contains at least one compound of general formula N; more preferably contains at least one compound of general formula N2~N7, general formula N10~N19; further preferably contains 2 to 10 compounds of general formula N2~N7, general formula N10~N19.

In some embodiments of the present invention, the compound of general formula N is preferably selected from the group consisting of compounds of general formula N5, general formula N6, general formula N11 and general formula N18.

Regarding the preferred content of the compound of the general formula N: relative to the total weight of the composition of the present invention, the lower limit of the preferred content of the compound of the general formula N is 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 By weight, the upper limit of the preferred content of the compound of the general formula N is 95%, 90%, 88%, 85%, 83%, 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, when it is necessary to keep the viscosity of the liquid crystal composition of the present invention low and the response time short, the lower limit value of the content of the compound of general formula N is preferably lower, and the upper limit value is lower. . Further, when the liquid crystal composition of the present invention needs to maintain a high clearing point and good temperature stability, it is preferable that the lower limit value and upper limit value of the content of the compound of the general formula N be lower. 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 N higher.

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 alkyl group containing 1-10 carbon atoms, a straight-chain alkyl group containing 1-9 carbon atoms Chain alkoxy or straight-chain alkenyl containing 2 to 10 carbon atoms; more preferably straight-chain alkyl containing 1 to 8 carbon atoms, straight-chain alkane containing 1 to 7 carbon atoms Oxy group, or straight-chain alkenyl group containing 2 to 8 carbon atoms; more preferably a straight-chain alkyl group containing 1 to 5 carbon atoms, and a straight-chain alkoxy group containing 1 to 4 carbon atoms , or a straight-chain alkenyl group containing 2 to 5 carbon atoms.

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

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

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

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

The lower limit of the preferred content of the compound of the general formula M is 1%, 10%, 20%, 30%, 40% or 50% relative to the total weight of the liquid crystal composition of the present invention; relative to the liquid crystal composition of the present invention The upper limit of the preferred content of the compound of general formula M is 95%, 85%, 75%, 65%, 60%, 55%, 45%, 35% or 25% based on the total weight of the compound.

In some embodiments of the present invention, when reliability is important, it is preferred that both R _M1 and R _M2 are alkyl groups; when attention is paid to reducing the volatility of the compound, it is preferred that both R _M1 and R _M2 are alkoxy groups and when emphasis is placed on viscosity reduction, at least one of R _M1 and R _M2 is preferably an alkenyl group.

In some embodiments of the invention, the compound of general formula M is particularly preferably selected from the group consisting of compounds of general formula M1, general formula M2, general formula M3, general formula M7, general formula M8 and general formula M9.

M1-a；

M1-b；

M1-c；

M1-d；以及

M1-e。 其中， 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、或含有1-7個碳原子的直鏈或支鏈的烷氧基。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; and

M1-e. Wherein, R _M11 and R _M21 each independently represent a linear or branched alkyl group containing 1 to 8 carbon atoms, or a linear or branched alkoxy group containing 1 to 7 carbon atoms.

Regarding the preferred content of the compound of the general formula M1: with respect to the total weight of the liquid crystal composition of the present invention, the lower limit of the preferred content of the compound of the general formula M1 is 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 content of the compound of general formula M1 The upper limit is 95%, 90%, 85%, 80%, 75%, 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 _M11 in the compounds of general formula M1-a, general formula M1-b, general formula M1-d and general formula M1-e is preferably a straight chain containing 1 to 5 carbon atoms The alkyl group; more preferably a straight-chain alkyl 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 _M11 is n-propyl in the compounds of general formula M1-a are particularly preferred.

Relative to the total weight of the liquid crystal composition of the present invention, the lower limit of the preferred content of the compound in which R _M11 represents an n-propyl group in the compound of the general formula M1-a is 1%, 5%, 10%, 15%, 17% , 20%, 23%, 25%, 27%, 30% or 35%; relative to the total weight of the composition of the present invention, in the compound of general formula M1-a, R _M11 represents the preferred content of n-propyl compound The upper limit is 60%, 55%, 50%, 45%, 42%, 40%, 38%, 35%, 33% or 30%.

In some embodiments of the present invention, in terms of response time, when a higher clearing point is desired, compounds of formula M1-a wherein R _M11 is n-butyl or n-pentyl are preferred.

Relative to the total weight of the liquid crystal composition of the present invention, the lower limit of the preferred content of the compound in which R _M11 represents an n-propyl group in the compound of the general formula M1-b is 0%, 1%, 2%, 3%, 5% , 7% or 10%; relative to the total weight of the liquid crystal composition of the present invention, the upper limit of the preferred content of the compound in which R _M11 represents an n-propyl group in the compound of general formula M1-b is 20%, 15%, 13% %, 10%, 8%, 7%, 6%, 5% or 3%.

In some embodiments of the present invention, R _M11 and R _M21 in the compound of general formula M1-c each independently represent a straight-chain alkyl group containing 1-8 carbon atoms, or a linear alkyl group containing 1-7 carbon atoms A linear alkoxy group; more preferably a linear alkyl group containing 1 to 5 carbon atoms, or a linear alkoxy group containing 1 to 4 carbon atoms.

The lower limit of the preferred content of the compound of the general formula M1-c is 1%, 5%, 10%, 13%, 15%, 17%, 20%, 23% with respect to the total weight of the liquid crystal composition of the present invention , 25% or 30%; relative to the total weight of the liquid crystal composition of the present invention, the upper limit of the preferred content of the compound of the general formula M1-c 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, a compound in which R _M11 is n-propyl and R _M21 is C ₂ H ₅ - in the compound of general formula M1-c is particularly preferred .

With respect to the total weight of the liquid crystal composition of the present invention, the lower limit of the preferred content of the compound in which R _M11 is n-propyl and R _M21 is C ₂ H ₅ - in the compound of general formula M1-c is 1%, 2 %, 3%, 5%, 7%, 10%, 13%, 15%, 18% or 20%; relative to the total weight of the liquid crystal composition of the present invention, R _M11 in the compound of the general formula M1-c is positive The upper limit of the preferred content of the compound in which propyl group and R _M21 is C ₂ H ₅ - is 20%, 17%, 15%, 13%, 10%, 8%, 7% or 6%.

The lower limit of the preferred content of the compound of the general formula M1-d is 1%, 5%, 10%, 13%, 15%, 17% or 20% with respect to the total weight of the liquid crystal composition of the present invention; In the total weight of the liquid crystal composition of the present invention, the preferred upper limit of the content of the compound of the general formula M1-d is 25%, 23%, 20%, 17%, 15%, 13% or 10%.

The lower limit of the preferred content of the compound of the general formula M1-e is 1%, 5%, 10%, 13%, 15%, 17% or 20% with respect to the total weight of the liquid crystal composition of the present invention; In the total weight of the liquid crystal composition of the present invention, the preferred upper limit of the content of the compound of the general formula M1-e is 25%, 23%, 20%, 17%, 15%, 13% or 10%.

In some embodiments of the present invention, compounds of general formula M1-d and compounds of general formula M1-e wherein R _M11 is n-propyl are preferred.

Relative to the total weight of the liquid crystal composition of the present invention, the lower limit of the preferred content of the compound in which R _M11 is n-propyl in the compound of general formula M1-d is 1%, 2%, 3%, 5%, 7% , 10%, 13%, 15%, 18% or 20%; relative to the total weight of the liquid crystal composition of the present invention, the upper limit of the preferred content of the compound in which R _M11 is n-propyl in the compound of general formula M1-d Values are 20%, 17%, 15%, 13%, 10%, 8%, 7% or 6%.

Regarding the preferred content of the compound of the general formula M2: with respect to the total weight of the liquid crystal composition of the present invention, the lower limit of the preferred content of the compound of the general formula M2 is 1%, 2%, 3%, 5%, 7% or 10%; relative to the total weight of the liquid crystal composition of the present invention, the upper limit of the preferred content of the compound of the general formula M2 is 20%, 15%, 13%, 10%, 8%, 7%, 6%, 5% % or 3%.

Regarding the preferred content of the compound of the general formula M3: with respect to the total weight of the liquid crystal composition of the present invention, the lower limit of the preferred content of the compound of the general formula M3 is 1%, 2%, 3%, 5%, 7% or 10%; relative to the total weight of the liquid crystal composition of the present invention, the upper limit of the preferred content of the compound of the general formula M3 is 20%, 15%, 13%, 10%, 8%, 7%, 6%, 5% % or 3%.

Regarding the preferred content of the compound of the general formula M7: relative to the total weight of the liquid crystal composition of the present invention, the lower limit of the preferred content of the compound of the general formula M7 is 1%, 2%, 3%, 5%, 7%, 10% %, 14%, 16%, 20%, 23%, 26%, 30%, 35% or 40%; with respect to the total weight of the liquid crystal composition of the present invention, the upper limit of the preferred content of the compound of the general formula M7 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 in the compound containing general formula M7, R _M1 is containing 2-4 carbon atoms The straight-chain alkenyl group, and R _M2 is CH ₃ - compound, the straight-chain alkenyl group containing 2-4 carbon atoms is more preferably

or

.

或

、且R_M2 為CH₃ -的化合物的優選含量的下限值為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，所述兩種化合物的優選含量的下限值為15%，19%，24%或30%，優選上限值為45%，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

, and the lower limit of the preferred content of the compound in which R _M2 is CH ₃ - is 3%, 5%, 7%, 9%, 11%, 12%, 13%, 18% or 21%, and the preferred upper limit value 45%, 40%, 35%, 30%, 25%, 23%, 20%, 18%, 15%, 13%, 10% or 8%. When the two compounds are contained at the same time, relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the content of the two compounds is 15%, 19%, 24% or 30%, and the preferred upper limit is 45%, 40%, 35%, 30%, 25%, 23%, 20%, 18%, 15% or 13%.

Regarding the preferred content of the compound of the general formula M8: relative to the total weight of the liquid crystal composition of the present invention, the lower limit of the preferred content of the compound of the general formula M8 is 1%, 2%, 3%, 4%, 5%, 7%, 10%, 14%, 16% or 20%; relative to the total weight of the liquid crystal composition of the present invention, the upper limit of the preferred content of the compound of the general formula M8 is 45%, 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 alkenyl group, and R _M2 is CH ₃ - compound, the straight-chain alkenyl group containing 2-4 carbon atoms is more preferably

or

.

或

、且R_M2 為CH₃ -的化合物的優選含量的下限值為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，所述兩種化合物的優選含量的下限值為15%，19%，24%或30%，並且優選上限值為45%，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 lower limit of the preferred content of the compound in which R _M2 is CH ₃ - is 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, the lower limit of the preferred content of the two compounds is 15%, 19%, 24% or 30% with respect to the total weight of the liquid crystal composition of the present invention, and the upper limit is preferably Limits are 45%, 40%, 35%, 30%, 25%, 23%, 20%, 18%, 15% or 13%.

Regarding the preferred content of the compound of the general formula M9: relative to the total weight of the liquid crystal composition of the present invention, the lower limit of the preferred content of the compound of the general formula M9 is 1%, 2%, 3%, 5%, 7%, 10% %, 14%, 16%, 20%, 23%, 26%, 30%, 35% or 40%; relative to the total weight of the liquid crystal composition of the present invention, the upper limit of the preferred content of the compound of the general formula M9 50%, 40%, 35%, 30%, 20%, 15%, 10% or 5%.

或

、且R_M2 為正丙基的化合物，或優選R_M1 為正丙基、正丁基或正戊基、且R_M2 為CH₃ O-的化合物；特別優選R_M1 為正丙基、且R_M2 為C₂ H₅ -的化合物。In some embodiments of the present invention, the compound of general formula M9 is preferably a compound in which 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 a compound of n-propyl, or preferably R _M1 is n-propyl, n-butyl or n-pentyl, and R _M2 is a compound of CH ₃ O-; particularly preferably R _M1 is n-propyl, and R A compound in which _M2 is C ₂ H ₅ -.

Regarding the preferred content of the compound of the general formula M11: with respect to the total weight of the liquid crystal composition of the present invention, the lower limit of the preferred content of the compound of the general formula M11 is 1%, 2%, 3%, 5%, 7%, 10% %, 14%, 16%, 20%, 23%, 26%, 30%, 35% or 40%; with respect to the total weight of the liquid crystal composition of the present invention, the upper limit of the preferred content of the compound of the general formula M11 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 straight-chain alkyl group containing 2-5 carbon atoms, or preferably one of R _M1 and R _M2 for

or

, and the other is a compound of CH ₃ - or C ₂ H ₅ -.

Regarding the preferred content of the compounds of general formula M17~M21: relative to the total weight of the liquid crystal composition of the present invention, the lower limit of the preferred total content of the compounds of general formula M17~M21 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 upper limit of the preferred total content of the compounds of general formula M17～M21 is 30%, 25% , 23%, 20%, 18%, 15%, 10% or 5%.

；和/或

， 其中， R_A1 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-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

、環

、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 、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 -； L_A11 、L_A12 、L_A13 、L_A21 和L_A22 各自獨立地表示-H、-F或-CH₃ ； X_A1 和X_A2 各自獨立地表示鹵素、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 和n_A2 各自獨立地表示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，當n_A2 =2或3時，環

可以相同或不同，Z_A21 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 and/or at least one compound of general formula A-2, said compound of general formula A-1 and/or general formula The compounds of A-2 have positive dielectric anisotropy:

;and / or

, wherein, R _A1 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 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

,ring

,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 -Hs in can be replaced by -CN, -F or -Cl, and -CH= can be replaced by -N= in one or more rings; Z _A11 , Z _A21 and Z _A22 represent independently 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 , L _A13 , L _A21 and L _A22 each independently represent -H, -F or -CH ₃ ; X _A1 and X _A2 each independently represent a halogen, containing haloalkyl or haloalkoxy of 1 to 5 carbon atoms, haloalkenyl or haloalkenyloxy of 2 to 5 carbon atoms; and n _A1 and n _A2 each independently represent 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, when n _A2 = 2 or 3, the ring

Can be the same or different, Z _A21 can be the same or different.

In some embodiments of the present invention, the compound of general formula A-1 and/or the compound of general formula A-2 is preferably a compound whose absolute value of dielectric anisotropy is greater than 3.

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， 通式A-2的化合物選自由如下化合物組成的組：

A-2-1；

A-2-2；

A-2-3；

A-2-4；

A-2-5；

A-2-6；

A-2-7；

A-2-8；

A-2-9；

A-2-10；

A-2-11；

A-2-12；

A-2-13；

A-2-14；

A-2-15；

A-2-16；

A-2-17；

A-2-18；

A-2-19；

A-2-20；

A-2-21；

A-2-22；

A-2-23；

A-2-24；以及

A-2-25， 其中， R_A11 和R_A21 各自獨立地表示含有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, the compound of general formula A-2 is selected from the group consisting of the following compounds:

A-2-1;

A-2-2;

A-2-3;

A-2-4;

A-2-5;

A-2-6;

A-2-7;

A-2-8;

A-2-9;

A-2-10;

A-2-11;

A-2-12;

A-2-13;

A-2-14;

A-2-15;

A-2-16;

A-2-17;

A-2-18;

A-2-19;

A-2-20;

A-2-21;

A-2-22;

A-2-23;

A-2-24; and

A-2-25, wherein R _A11 and R _A21 each independently represent a linear or branched alkyl group containing 1-12 carbon atoms, and the linear or branched alkyl group containing 1-12 carbon atoms One or two or more non-adjacent -CH ₂ - in the alkyl group may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO- substitution.

Regarding the preferred content of the compound of the general formula A-1 and/or the compound of the general formula A-2: relative to the total weight of the liquid crystal composition of the present invention, the compound of the general formula A-1 and/or the compound of the general formula A-2 The lower limit of the preferred content is 0%, 1%, 10%, 20%, 30%, 40%, 50%, 55%, 60%, 65%, 70%, 75% or 80%; The total weight of the liquid crystal composition of the invention, the upper limit of the preferred content of the compound of the general formula A-1 and/or the compound of the general formula A-2 is 95%, 85%, 75%, 65%, 55%, 45% %, 35% or 25%.

In some embodiments of the present invention, the compound of general formula A-1 is preferably the compound of general formula A-1-24.

In some embodiments of the present invention, the compound of general formula A-2 is preferably selected from the group consisting of compounds of general formula A-2-16 and general formula A-2-22.

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 wt% of the total weight of the liquid crystal composition; more preferably, the dopant accounts for 0-1 wt% of the total 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 wt% of the total weight of the liquid crystal composition; more preferably, the light stabilizer accounts for 0-1 wt% of the total weight of the liquid crystal composition; particularly preferred Typically, the light stabilizer accounts for 0-0.1 wt% of the total weight of the liquid crystal composition.

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, large ε _⊥ , large vertical dielectric to dielectric ratio, low rotational viscosity, suitably high clearing point, suitably high optical The anisotropy, and the large elastic constants K ₁₁ and K ₃₃ , are especially suitable for IPS liquid crystal displays, which can improve the transmittance of the display, reduce the response time, and increase the contrast ratio.

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, and the cell thickness d=7 μm (unless otherwise specified).

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.

γ1 is obtained by using the TOYO6254 liquid crystal property evaluation system; the test temperature is 25°C, and the test voltage is 90 V.

K ₁₁ and 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.

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 the 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 the 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

Example 6

The liquid crystal composition of Example 6 was prepared according to the compounds and the weight percentages listed in Table 8, and the liquid crystal composition was filled between the two substrates of the liquid crystal display for performance testing. Table 8 Liquid crystal composition formula and performance parameter test

Example 7

The liquid crystal composition of Example 7 was prepared according to the compounds and weight percentages listed in Table 9, and the liquid crystal composition was filled between the two substrates of the liquid crystal display for performance testing. Table 9 Liquid crystal composition formula and performance parameter test

Example 8

The liquid crystal composition of Example 8 was prepared according to the compounds and the weight percentages listed in Table 10, and the liquid crystal composition was filled between the two substrates of the liquid crystal display for performance testing. Table 10 Liquid crystal composition formula and performance parameter test

It can be seen from the above Comparative Example 1 and Examples 1-8 that the liquid crystal composition provided by the present invention has high dielectric anisotropy, large ε _⊥ , large vertical dielectric to dielectric ratio, low rotational viscosity, With suitably high clearing point, suitably high optical anisotropy, and large elastic constants K ₁₁ and K ₃₃ , when the liquid crystal composition is applied in an IPS liquid crystal display, the transmittance of the display can be improved, the response time can be reduced, and Increase contrast.

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 (9)

A liquid crystal composition with high transmittance, comprising: at least one compound of general formula I

at least one compound of formula N

; and at least one compound of general formula M

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

,

or

, one or non-adjacent two 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 -Hs in can be independently replaced by -F or -Cl; R _N1 and R _N2 each independently represent a straight-chain or branched alkyl group containing 1-12 carbon atoms,

,

or

, 1 or more than 2 non-adjacent -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- substitution; R _M1 and R _M2 each independently represent -H, straight or branched chain containing 1-12 carbon atoms alkyl,

,

or

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

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 the -H may be substituted by halogen; Z _N1 and Z _N2 each independently represent a single bond, -CO-O-, -O-CO-, -CH ₂ O-, -OCH ₂ -, -CH=CH -, -C≡C-, -CH ₂ CH ₂ -, -(CH ₂ ) ₄ -, -CF ₂ O-, -OCF ₂ - or -CF ₂ CF ₂ -; Z _M1 and Z _M2 each independently represent Single bond, -CO-O-, -O-CO-, -CH ₂ O-, -OCH ₂ -, -CH=CH-, -C≡C-, -CH ₂ CH ₂ - or -(CH ₂ ) _4- ; X represents halogen, haloalkyl or haloalkoxy containing 1-5 carbon atoms, haloalkenyl or haloalkenyloxy containing 2-5 carbon atoms; n _N1 and n _N2 each independently represent 0, 1, 2, or 3, and 0

n _N1 +n _N2

3, and when n _N1 = 2 or 3, the ring

Can be the same or different, Z _N1 can be the same or different, when n _N2 = 2 or 3, the ring

may be the same or different, Z _N2 may be the same or different; and 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; wherein, the compound of the general formula I is selected from the group consisting of the following compounds:

;as well as

wherein L ₁ , L ₂ , L ₅ , L ₆ and L ₇ each independently represent -H or -F; L ₄ represents -H or -CH ₃ ; n1 represents 0 or 1; and R _x , R _y and R _z each independently represents -CH ₂ - or -O-. The liquid crystal composition according to item 1 of the claimed scope, wherein the compound of the general formula N is selected from the group consisting of the following compounds:

;as well as

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 3 of the claimed scope, wherein the compound of general formula M is selected from the group consisting of compounds of general formula M1, general formula M2, general formula M3, general formula M7, general formula M8 and general formula M9 group. The liquid crystal composition according to claim 3 or 4, wherein the compound of the general formula M1 is selected from the group consisting of the following compounds:

;as well as

Wherein, R _M11 and R _M21 each independently represent a linear or branched alkyl group containing 1 to 8 carbon atoms, or a linear or branched alkoxy group containing 1 to 7 carbon atoms. The liquid crystal composition according to item 5 of the claimed scope, wherein R _M11 in the compound of the general formula M1-a is n-propyl group. The liquid crystal composition according to claim 1, wherein the liquid crystal composition further contains at least one compound of the general formula A-1 and/or at least one compound of the general formula A-2, the general formula A-1 The compound of and the compound of the general formula A-2 both have positive dielectric anisotropy:

;and / or

Wherein, R _A1 and R _A2 each independently represent a linear or branched alkyl group containing 1-12 carbon atoms,

,

or

, 1 or more than 2 non-adjacent -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 -Hs in can be independently replaced by -F or -Cl; ring

,ring

,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 the ring can be replaced by -CN, -F or -Cl, and -CH= can be replaced by -N= in one or more rings; Z _A11 , Z _A21 and Z _A22 each independently represent 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 , L _A13 , L _A21 and L _A22 each independently represent -H, -F or -CH ₃ ; X _A1 and X _A2 each independently represent a halogen, containing haloalkyl or haloalkoxy of 1 to 5 carbon atoms, haloalkenyl or haloalkenyloxy of 2 to 5 carbon atoms; and n _A1 and n _A2 each independently represent 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, when n _A2 = 2 or 3, the ring

Can be the same or different, Z _A21 can be the same or different. The liquid crystal composition according to item 7 of the claimed scope, wherein the compound of the general formula A-1 is selected from the group consisting of the following compounds:

;as well as

The compound of the general formula A-2 is selected from the group consisting of the following compounds:

;as well as

Wherein, R _A11 and R _A21 each independently represent 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 two or more non-adjacent -CH ₂ - can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO- . A liquid crystal display device comprising the liquid crystal composition according to any one of claims 1 to 8 of the application patent scope.