TWI711691B - Liquid crystal composition and its display device - Google Patents

Abstract

The present invention discloses a liquid crystal composition comprising: one or more compounds of general formula II; one or more compounds of general formula M; and one or more compounds of general formula A-2. The invention also discloses a liquid crystal display device including the liquid crystal composition of the invention. While maintaining proper clearing point and dielectric anisotropy, the liquid crystal composition provided by the present invention also has greater optical anisotropy, lower rotational viscosity, better low-temperature storage stability, and greater The K _ave value and larger VHR (initial) and VHR (UV) and VHR (high temperature) (ie better reliability) make the liquid crystal display device containing the liquid crystal composition of the present invention have less light scattering, And high contrast ratio, especially suitable for liquid crystal display elements driven by active matrix thin film transistors (AM-TFT).

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 thereof.

Liquid crystal display elements can be used in various household appliances such as clocks and electronic calculators, measuring equipment, automotive panels, word processors, computers, printers, televisions, and the like. According to the type of display mode, it is divided into PC (phase change), TN (twist nematic), STN (super twisted nematic), ECB (electrically controlled birefringence), OCB (optically compensated bend), IPS (in-plane switching), VA (vertical alignment, vertical alignment) and other types. According to the driving mode of the element, it is divided into PM (passive matrix, passive matrix) type and AM (active matrix, active matrix) type. PM is divided into static (static) and multiple (multiplex) and other types. AM is divided into TFT (thin film transistor, thin film transistor), MIM (metal insulator metal, metal-insulating layer-metal) and other types. The types of TFTs include amorphous silicon and polycrystal silicon. The latter is divided into high temperature type and low temperature type according to the manufacturing process. According to the type of light source, liquid crystal display elements are classified into a reflective type using natural light, a transmissive type using backlight, and a semi-transmissive type using two light sources: natural light and backlight.

In the case of low information content, passive driving is generally adopted. However, as the amount of information increases, the display size and the number of display channels increase, and the crosstalk and contrast reduction phenomenon becomes serious, so the active matrix (AM) method is generally used for driving At present, more thin film transistors (TFT) are used for driving. In the AM-TFT element, the TFT switching device is addressed in a two-dimensional grid, charging the electrode of the picture element within a limited time when it is on, and then turning off again, until it is addressed again in the next cycle. Therefore, between the two addressing cycles, it is undesirable that the voltage on the image element point changes, otherwise the transmittance of the image element point will change, resulting in unstable display. The discharge speed of the pixel point depends on the electrode capacity and the resistivity of the dielectric material between the electrodes. Therefore, the liquid crystal material is required to have a higher resistivity, and the liquid crystal material is required to have a suitable optical anisotropy Δn (the Δn value is generally around 0.08-0.13), and a lower threshold voltage to achieve lower driving voltage and lower power The purpose of consumption; it is also required to have a lower viscosity to meet the needs of rapid response. Such liquid crystal compositions have been reported in many documents, such as WO9202597, WO9116398, WO9302153, WO9116399, CN1157005A and so on.

， 其中，d表示液晶盒的間距，n_e 表示非尋常光折射率，並且n_o 表示尋常光折射率。由該關係式可知，LC Scattering與K_ave 成反比例，在提高K_ave 的情況下，可以降低液晶材料的漏光。Studies have shown that the most important factor affecting the contrast of liquid crystal display elements is the light leakage of the liquid crystal material, and the main factor affecting light leakage is light scattering (LC Scattering), and the relationship between LC Scattering and the average elastic constant K _ave is as follows: LC Scattering ∝

Wherein, d represents the pitch of the liquid crystal cell, n _e represents the refractive index of extraordinary light and n _o is the ordinary refractive index. It can be seen from this relationship that LC Scattering is inversely proportional to K _ave , and when K _ave is increased, the light leakage of the liquid crystal material can be reduced.

In addition, the relationship between contrast (CR) and brightness (L) is as follows: CR=L ₂₅₅ /L ₀ ×100%, where L ₂₅₅ is the on-state brightness, and L ₀ is the off-state brightness. It can be seen that the change in L ₀ should significantly affect CR. In the off state, L ₀ has nothing to do with the dielectric of the liquid crystal molecules, but is related to the LC Scattering of the liquid crystal material itself. The smaller the LC Scattering, the smaller the L ₀ , and thus the CR will increase significantly.

A liquid crystal display element containing a liquid crystal composition having a large absolute value of dielectric anisotropy can lower the base voltage value, lower the driving voltage, and further reduce the power consumption.

A liquid crystal display element containing a liquid crystal composition with a lower threshold voltage can effectively reduce display power consumption, especially in consumables, such as portable electronic products such as mobile phones and tablet computers, which have longer battery life. However, for a liquid crystal composition with a lower threshold voltage (generally containing a large dielectric electrode group), the order of the liquid crystal molecules is low, and the K _ave value reflecting the order of the liquid crystal molecules will also decrease, thereby affecting the liquid crystal Light leakage and contrast of materials are often difficult to balance.

A liquid crystal composition with a low viscosity can increase the response speed of a liquid crystal display element. When the response speed of the liquid crystal display element is fast, it can be suitable for animation display. In addition, when the liquid crystal composition is injected into the liquid crystal cell of the liquid crystal display element, the injection time can be shortened, and the workability can be improved.

The prior art discloses a liquid crystal composition with lower power consumption and faster response, such as patent document CN102858918A, but the liquid crystal composition in the prior art has environmental protection problems (such as the use of chlorine-containing compounds) and short service life (such as Poor UV or thermal stability), low contrast (such as whitening of the display screen under sunlight), and the inability to take into account the requirements of proper optical anisotropy, proper dielectric anisotropy, and high voltage in LCD TVs, tablet computers, etc. The performance balance of retention rate, good UV stability and high temperature stability cannot meet all indicators at the same time.

From the perspective of the preparation of liquid crystal materials, the various properties of liquid crystal materials are mutually restrictive, and the improvement of a certain performance index may change other properties. Therefore, the preparation of liquid crystal materials with suitable properties in all aspects often requires creative work.

Liquid crystal materials are an important part of liquid crystal displays. At present, global liquid crystal displays have great market demand. They are mostly used in electronic and electrical products, but their life cycles are short. The short life cycle naturally has problems such as waste and pollution. Now that the issue of green environmental protection is increasingly being valued by all walks of life, if we can control from the source, that is, choose environmentally friendly green materials in the liquid crystal material preparation process, it will be greatly improved. Reduce the environmental cost of disposing of discarded LCD monitors. Therefore, the preparation of liquid crystal materials with suitable properties in all aspects, economic, and environmentally friendly, often requires more creative work.

Purpose of the invention: In view of the defects of the prior art, the purpose of the present invention is to provide a method with greater optical anisotropy, lower rotational viscosity, and better optical anisotropy while maintaining proper clearing point and dielectric anisotropy. Liquid crystal composition with high low temperature storage stability, large K _ave value, and large VHR (initial) and VHR (UV) and VHR (high temperature) (that is, better reliability). The object of the present invention is also to provide a liquid crystal display device including the liquid crystal composition.

Ⅱ； 一種或多種通式M的化合物

M；以及 一種或多種通式A-2的化合物

A-2， 其中， R₂ 表示-H、含有1-12個碳原子的直鏈的烷基或烷氧基、含有2-12個碳原子的烯基或烯氧基； 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； R_A2 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； 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 -； 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_A21 和L_A22 各自獨立地表示-H、含有1-3個碳原子的烷基或鹵素； 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； 環

表示

或

； 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； 環

和環

各自獨立地表示

、

、

或

，其中，

、

和

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，

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； a和b各自獨立地表示0至5的整數； n_M1 和n_A2 各自獨立地表示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n_A2 =2或3時，環

可以相同或不同，Z_A21 可以相同或不同；並且 所述通式M的化合物中並不包含所述通式Ⅱ的化合物。 Technical scheme of the present invention: In order to achieve the above-mentioned object of the present invention, the present invention provides a liquid crystal composition, which comprises: one or more compounds of general formula II

Ⅱ; One or more compounds of general formula M

M; and one or more compounds of general formula A-2

A-2, where R ₂ represents -H, a linear alkyl group or alkoxy group containing 1-12 carbon atoms, an alkenyl group or alkenyloxy group containing 2-12 carbon atoms; R _M1 and R _M2 Each independently represents -H, a linear or branched alkyl group containing 1-12 carbon atoms,

,

or

, One or two or more non-adjacent -CH ₂ -in the linear or branched alkyl group containing 1-12 carbon atoms can be independently controlled by -CH=CH-, -C≡ C-, -O-, -CO-, -CO-O- or -O-CO- substitution; R _A2 represents a straight or branched chain alkyl group containing 1-12 carbon atoms,

,

or

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

,

or

One or more of -H may be independently replaced by -F or -Cl; 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 -; Z _A21 and Z _A22 each independently represent a single bond, -CH ₂ CH ₂ -, -CF ₂ CF ₂ -, -CO-O-, -O-CO-, -O-CO-O-, -CH=CH-, -CF=CF-, -CH ₂ O- or -OCH ₂ -; L _A21 and L _A22 each independently represent -H, an alkyl group containing 1-3 carbon atoms or halogen; X _A2 represents halogen, a halogenated alkyl group or halogenated alkoxy group containing 1-5 carbon atoms, containing 2- Haloalkenyl or haloalkenyloxy of 5 carbon atoms; ring

Means

or

; Ring

,ring

And ring

Expressed independently

or

,among them,

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

At most one -H in it may be substituted by halogen; ring

And ring

Expressed independently

,

,

or

,among them,

,

with

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

with

One or more of -H may be substituted by -CN, -F or -Cl, and -CH= may be substituted by -N= in one or more rings; a and b each independently represent an integer from 0 to 5 ; N _M1 and n _A2 each independently represent 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 n _A2 = 2 or 3, the ring

It may be the same or different, and Z _A21 may be the same or different; and the compound of the general formula M does not include the compound of the general formula II.

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

In some embodiments of the present invention, the compound of general formula II accounts for 0.1%-50% by weight of the liquid crystal composition.

In some embodiments of the present invention, in the compound of Formula II, a and b each independently represent 0, 1, or 2.

In some embodiments of the present invention, in the compound of formula II, R ₂ is preferably an alkyl group or alkoxy group containing 1-8 carbon atoms, an alkenyl group or alkenyloxy group containing 2-8 carbon atoms ; It is further preferably an alkyl group or alkoxy group containing 1-5 carbon atoms, an alkenyl group or alkenyloxy group containing 2-5 carbon atoms.

Ⅱ-1；

Ⅱ-2；

Ⅱ-3；以及

Ⅱ-4， 其中， L_x 表示-H或-CH₃ 。In some embodiments of the invention, the compound of formula II is selected from the group consisting of:

Ⅱ-1;

Ⅱ-2;

Ⅱ-3; and

Ⅱ-4, where L _x represents -H or -CH ₃ .

In some embodiments of the present invention, the compound of general formula II is preferably selected from the group consisting of compounds of general formula II-2, general formula II-3 and general formula II-4; further preferably from general formula II-3 and general formula II-3 The group consisting of compounds of II-4; especially preferred from compounds of general formula II-4.

In some embodiments of the present invention, the liquid crystal composition preferably contains at least two compounds of general formula II; particularly preferably, it contains at least three compounds of general formula II.

In some embodiments of the present invention, it is further preferred that the liquid crystal composition contains at least two compounds of general formula II, and at least one compound of general formula II is selected from compounds of general formula II-4.

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

In some embodiments of the present invention, in the compound of the general formula M, R _M1 and R _M2 are each independently preferably a straight chain alkyl group containing 1 to 10 carbon atoms, a straight chain containing 1 to 9 carbon atoms Chain alkoxy group, or straight chain alkenyl group containing 2 to 10 carbon atoms; more preferably straight chain alkyl group containing 1 to 8 carbon atoms, straight chain alkane group containing 1 to 7 carbon atoms An oxy group or a straight-chain alkenyl group containing 2 to 8 carbon atoms; more preferably a straight-chain alkyl group containing 1 to 5 carbon atoms or 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, R _M1 and R _M2 each independently represent a linear alkenyl group containing 2 to 8 carbon atoms; further preferably, R _M1 and R _M2 each independently represent a Straight chain alkenyl of ~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, preferably, both R _M1 and R _M2 are linear alkyl groups containing 1 to 8 carbon atoms, or linear alkoxy groups containing 1 to 7 carbon atoms. ; Further preferably, both R _M1 and R _M2 are linear alkyl groups containing 1 to 5 carbon atoms, or linear alkoxy groups 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 to 5 carbon atoms, and the other is a straight-chain alkyl group containing 1 to 5 carbon atoms. A chain alkyl group, or a straight chain alkoxy group containing 1 to 4 carbon atoms; further preferably, both R _M1 and R _M2 are straight chain alkyl groups 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 the formula (V1) to the formula (V9), particularly preferably the 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；

M20；

M21；

M22；

M23；以及

M24。In some embodiments of the invention, the compound of 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;

M21;

M22;

M23; and

M24.

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

Regarding the weight percentage of the compound of the general formula M in the liquid crystal composition of the present invention, the weight percentage of the compound of the general formula M in the liquid crystal composition of the present invention is preferably lower than the total weight of the liquid crystal composition of the present invention. The limit is 0.1%, 1%, 10%, 20%, 30%, 40% or 50%; relative to the total weight of the liquid crystal composition of the present invention, the compound of the general formula M accounts for the total weight of the liquid crystal composition of the present invention The preferred upper limit of the weight percentage is 90%, 85%, 80%, 75%, 70%, 65%, 60%, 55%, 50%, 45%, 35% or 25%.

In some embodiments of the present invention, the compound of the general formula M accounts for 0.1%-90% by weight of the liquid crystal composition.

Regarding the content of the compound of the general formula M, 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 is higher and the upper limit is higher; When the clearing point of the liquid crystal composition of the invention is high and the temperature stability is good, it is preferable that the lower limit is higher and the upper limit is higher; in order to keep the driving voltage low and to make the dielectric anisotropy When the absolute value of is increased, it is preferable to make the lower limit value and the upper limit value lower.

In some embodiments of the present invention, when reliability is important, it is preferable that R _M1 and R _M2 are both alkyl groups; when it is important to reduce the volatility of compounds, it is preferable that both R _M1 and R _M2 are alkoxy groups. ; When attaching importance to viscosity reduction, it is preferable that at least one of R _M1 and R _M2 is an alkenyl group.

In some embodiments of the present invention, the compound of general formula M is particularly preferably free of general formula M1, general formula M2, general formula M3, general formula M4, general formula M7, general formula M8, general formula M9, general formula M10, general formula Formula M11, general formula M13, general formula M15, general formula M16, general formula M17, general formula M18, general formula M19, general formula M20, general formula M21, general formula M22, general formula M23 and general formula M24 group.

In some embodiments of the present invention, the compound of general formula M is preferably selected from the group consisting of compounds of general formula M1, general formula M2, general formula M4, general formula M9 and general formula M13.

In some embodiments of the present invention, in the compound of the general formula M1, R _M1 represents a linear or branched alkyl or alkoxy group containing 1 to 7 carbon atoms; more preferably, it contains 1 to 5 carbon atoms The straight or branched alkyl or alkoxy group.

Regarding the preference of the compound of the general formula M1 in the weight percentage of the liquid crystal composition of the present invention: relative to the total weight of the liquid crystal composition of the present invention, the compound of the general formula M1 in the weight percentage of the liquid crystal composition of the present invention is preferably The lower limit is 1%, 3%, 5%, 7%, 10%, 13%, 15%, 17%, 20%, 23%, 25% or 30%; relative to the liquid crystal composition of the present invention The total weight, the preferred upper limit of the weight percentage of the compound of the general formula M1 in the liquid crystal composition of the present invention is 60%, 55%, 50%, 45%, 40%, 37%, 35%, 33%, 30 %, 27%, 25%, 23%, 20%, 17%, 15%, 13% or 10%.

In some embodiments of the present invention, in order to particularly improve the response time of the liquid crystal composition of the present invention, it is preferred that in the compound of general formula M1, R _M1 is ethyl, n-propyl, butyl or pentyl, and R _M2 is methyl. In the compound of general formula M1, R _M1 is ethyl, n-propyl, butyl or pentyl, and R _M2 is ethyl or ethoxy compound, or in the compound of general formula M1 The compound in which R _M1 is n-propyl, butyl or pentyl, and R _M2 is n-propyl or propoxy.

Relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of the general formula M1 where R _M1 is n-propyl and R _M2 is ethyl 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 _M1 in the compound of general formula _M1 is The preferred upper limit of the weight percentage of the compound with n-propyl group and R _M2 being ethyl in the liquid crystal composition of the present invention is 20%, 17%, 15%, 13%, 10%, 8%, 7% or 6. %.

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

The weight percentage of the compound of the general formula M4 in the liquid crystal composition of the present invention is preferably: relative to the total weight of the liquid crystal composition of the present invention, the weight percentage of the compound of the general formula M4 in the liquid crystal composition of the present invention is preferably below The limit is 1%, 2%, 3%, 5%, 7% or 10%; relative to the total weight of the liquid crystal composition of the present invention, the weight percentage of the compound of general formula M4 in the liquid crystal composition of the present invention is preferably The upper limit value is 20%, 15%, 13%, 10%, 8%, 7%, 6%, 5% or 3%.

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

或

。In some embodiments of the present invention, depending on the required properties such as solubility at low temperature, transition temperature, electrical reliability, birefringence, etc., it is preferred that in the compound containing general formula M9, R _M1 contains 2-4 carbon atoms. The linear or branched alkenyl group of which R _M2 is CH ₃ -, the linear or branched alkenyl group containing 2-4 carbon atoms is further preferably

or

.

或

、且R_M2 為CH₃ -的化合物的占本發明的液晶組合物的重量百分比優選的下限值為1%，3%，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%，並且優選上限值為45%，40%，35%，30%，25%，23%，20%，18%，15%、13%、11%或9%。Relative to the total weight of the liquid crystal composition of the present invention, R _M1 in the compound of the general formula M9 is

or

And the preferred lower limit of the weight percentage of the compound in which R _M2 is CH ₃ -in the liquid crystal composition of the present invention is 1%, 3%, 5%, 7%, 9%, 11%, 12%, 13% , 18% or 21%, and the preferred upper limit value is 45%, 40%, 35%, 30%, 25%, 23%, 20%, 18%, 15%, 13%, 10% or 8%. When the two compounds are contained at the same time, relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the two compounds in the liquid crystal composition of the present invention is 3%, 5%, 7 %, 9%, 11%, 13%, 15%, 19%, 24% or 30%, and the preferred upper limit value is 45%, 40%, 35%, 30%, 25%, 23%, 20%, 18%, 15%, 13%, 11% or 9%.

The weight percentage of the compound of the general formula M10 in the liquid crystal composition of the present invention is preferably: relative to the total weight of the liquid crystal composition of the present invention, the weight percentage of the compound of the general formula M10 in the liquid crystal composition of the present invention is preferably below The limit is 1%, 2%, 3%, 4%, 5%, 7%, 10%, 14%, 16% or 20%; relative to the total weight of the liquid crystal composition of the present invention, the compound of general formula M10 The preferred upper limit of the weight percentage of the liquid crystal composition of the present invention 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 in the compound containing the general formula M10, R _M1 contains 2-4 carbon atoms. The linear or branched alkenyl group of which R _M2 is CH ₃ -, the linear or branched alkenyl group containing 2-4 carbon atoms is further preferably

or

.

或

、且R_M2 為CH₃ -的化合物的占本發明的液晶組合物的重量百分比優選的下限值為1%，3%，4%，5%，7%，9%，11%，12%，13%，18%或20%，並且優選上限值為40%，35%，30%，25%，23%，20%，18%，15%，13%，10%或8%。在同時含有所述兩種化合物時，相對于本發明的液晶組合物的總重量，所述兩種化合物的占本發明所述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45%，40%，35%，30%，25%，23%，20%，18%，15%或13%。Relative to the total weight of the liquid crystal composition of the present invention, R _M1 in the compound of the general formula M10 is

or

And the preferred lower limit of the weight percentage of the compound in which R _M2 is CH ₃ -in the liquid crystal composition of the present invention is 1%, 3%, 4%, 5%, 7%, 9%, 11%, 12% , 13%, 18% or 20%, and the preferred upper limit value is 40%, 35%, 30%, 25%, 23%, 20%, 18%, 15%, 13%, 10% or 8%. When the two compounds are contained at the same time, relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the two compounds in the liquid crystal composition of the present invention is 3%, 5% , 7%, 9%, 11%, 13%, 15%, 19%, 24% or 30%, and the preferred upper limit value is 45%, 40%, 35%, 30%, 25%, 23%, 20 %, 18%, 15% or 13%.

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

或

、且R_M2 為正丙基的化合物，或優選R_M1 為正丙基、正丁基或正戊基、且R_M2 為CH₃ O-的化合物；特別優選R_M1 為正丙基、且R_M2 為C₂ H₅ -的化合物。In some embodiments of the present invention, the compound of formula M11 is preferably a compound where R _M1 is n-propyl or n-pentyl, and R _M2 is C ₂ H ₅ -, or preferably R _M1 is

or

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

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

或

、而另一者為CH₃ -或C₂ H₅ -的化合物。In some embodiments of the present invention, the compound of the general formula M13 preferably R _M1 and R _M2 each independently represent a compound containing a linear or branched alkyl group of 2-5 carbon atoms, or preferably R _M1 and R _M2 One of

or

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

Regarding the preferred weight percentage of the compound of the general formula M15 in the liquid crystal composition of the present invention: relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the compound of the general formula M15 in weight percentage of the liquid crystal composition of the present invention The value is 1%, 2%, 3%, 5%, 7%, 10%, 12%, 14%, 16%, 18%, 20%, 23%, 26%, 30%, 35% or 40%; Relative to the total weight of the liquid crystal composition of the present invention, the preferred upper limit of the weight percentage of the compound of the general formula M15 in the liquid crystal composition of the present invention is 50%, 40%, 35%, 30%, 25%, 22 %, 20%, 18%, 15%, 12%, 10%, 8% or 5%.

Regarding the preferred weight percentage of the compound of the general formula M16 in the liquid crystal composition of the present invention: relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of the general formula M16 in the liquid crystal composition of the present invention The value is 1%, 2%, 3%, 5%, 7%, 10%, 12%, 14%, 16%, 18%, 20%, 23%, 26%, 30%, 35% or 40%; Relative to the total weight of the liquid crystal composition of the present invention, the preferred upper limit of the weight percentage of the compound of the general formula M16 in the liquid crystal composition of the present invention is 50%, 40%, 35%, 30%, 25%, 22 %, 20%, 18%, 15%, 12%, 10%, 8% or 5%.

Regarding the weight percentage of the compounds of the general formulas M20 to M24 in the liquid crystal composition of the present invention, it is preferable that: relative to the total weight of the liquid crystal composition of the present invention, the compounds of the general formulas M20 to M24 account for the total weight of the liquid crystal composition of the present invention. The preferred lower limit of 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 M20 The preferred upper limit of the compound of ~M24 in the total weight percentage of the liquid crystal composition of the present invention is 30%, 25%, 23%, 20%, 18%, 15%, 12%, 10% or 5%.

A-1， 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； 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、含有1-3個碳原子的烷基或鹵素； 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； 環

和環

各自獨立地表示

、

、

或

，其中，

、

和

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，

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； n_A11 表示0、1、2或3，且當n_A11 =2或3時，環

可以相同或不同，Z_A11 可以相同或不同；並且 n_A12 表示1或2，且當n_A12 =2時，環

可以相同或不同。In some embodiments of the present invention, the liquid crystal composition may further include one or more compounds of the general formula A-1:

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

,

or

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

,

or

One or more of -H may be independently substituted by -F or -Cl; 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, containing Alkyl or halogen with 1-3 carbon atoms; X _A1 represents halogen, haloalkyl or haloalkoxy with 1-5 carbon atoms, haloalkenyl or haloalkenyloxy with 2-5 carbon atoms ; Ring

And ring

Expressed independently

,

,

or

,among them,

,

with

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

with

One or more of -H can be replaced by -CN, -F or -Cl, and -CH= can be replaced by -N= in one or more rings; n _A11 represents 0, 1, 2 or 3, and When n _A11 = 2 or 3, the ring

Can be the same or different, Z _A11 can be the same or different; and n _A12 represents 1 or 2, and when n _A12 = 2, the ring

Can be the same or different.

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；以及

A-1-18， 其中， R_A1 表示含有1-8個碳原子的直鏈或支鏈的烷基、

、

或

，所述含有1-8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，並且存在於這些基團中的一個或更多個-H可分別獨立地被-F或-Cl取代； R_v 和R_w 各自獨立地表示-CH₂ -或-O-； L_A11 、L_A12 、L_A11 ^’ 、L_A12 ^’ 、L_A14 、L_A15 和L_A16 各自獨立地表示-H或-F； L_A13 和L_A13 ^’ 各自獨立地表示-H或-CH₃ ； X_A1 表示-F、-CF₃ 或-OCF₃ ；並且 v和w各自獨立地表示0或1。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; and

A-1-18, where R _A1 represents a linear or branched alkyl group containing 1-8 carbon atoms,

,

or

, One or more than two non-adjacent -CH ₂ -in the linear or branched alkyl group containing 1-8 carbon atoms can be independently controlled by -CH=CH-, -C≡ C-, -O-, -CO-, -CO-O- or -O-CO- are substituted, and one or more -H present in these groups can be independently substituted by -F or -Cl, respectively ; R _v and R _w each independently represent -CH ₂ -or -O-; L _A11 , L _A12 , L _A11 ^' , L _A12 ^' , L _A14 , L _A15 and L _A16 each independently represent -H or -F ; L _A13 and L _A13 ^′ each independently represent -H or -CH ₃ ; X _A1 represents -F, -CF ₃ or -OCF ₃ ; and v and w each independently represent 0 or 1.

Regarding the weight percentage of the compound of the general formula A-1 in the liquid crystal composition of the present invention, it is preferred: relative to the total weight of the liquid crystal composition of the present invention, the compound of the general formula A-1 accounts for the weight percentage of the liquid crystal composition of the present invention The preferred lower limit is 0.1%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 14%, 15%, 17% , 18% or 20%; relative to the total weight of the liquid crystal composition of the present invention, the preferred upper limit of the weight percentage of the compound of general formula 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%.

Regarding the preferable content of the compound of the general formula A-1, when the viscosity of the liquid crystal composition of the present invention is kept low and the response speed is fast, it is preferable that the lower limit is slightly lower and the upper limit is slightly lower. Further, when the clearing point of the liquid crystal composition of the present invention is kept high and the temperature stability is good, it is preferable to make the lower limit value slightly lower and the upper limit value slightly lower; in addition, in order to When the absolute value of the dielectric anisotropy is to be increased while keeping the driving voltage low, it is preferable to make the lower limit value and the upper limit value slightly higher.

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；以及

A-2-15， 其中， R_A2 表示含有1-8個碳原子的直鏈或支鏈的烷基，所述含有1-8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，並且存在於這些基團中的一個或更多個-H可分別獨立地被-F或-Cl取代； L_A21 、L_A22 、L_A23 、L_A24 和L_A25 各自獨立地表示-H或-F；並且 X_A2 表示-F、-CF₃ 、-OCF₃ 或-CH₂ CH₂ CH=CF₂ 。In some embodiments of the invention, the compound of general formula A-2 is selected from the group consisting of:

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; and

A-2-15, where R _A2 represents a linear or branched alkyl group containing 1-8 carbon atoms, one of the linear or branched alkyl groups containing 1-8 carbon atoms Or two or more non-adjacent -CH ₂ -can be replaced independently by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO- , And one or more -H present in these groups may be independently substituted by -F or -Cl; L _A21 , L _A22 , L _A23 , L _A24 and L _A25 each independently represent -H or- F; and X _A2 represents -F, -CF ₃ , -OCF ₃ or -CH ₂ CH ₂ CH=CF ₂ .

Regarding the weight percentage of the compound of the general formula A-2 in the liquid crystal composition of the present invention, it is preferred: relative to the total weight of the liquid crystal composition of the present invention, the compound of the general formula A-2 accounts for the weight percentage of the liquid crystal composition of the present invention The preferred lower limit is 0.1%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 14%, 15%, 17% , 18% or 20%; relative to the total weight of the liquid crystal composition of the present invention, the preferred upper limit of the weight percentage of the compound of general formula A-2 in the liquid crystal composition of the present invention is 80%, 75%, 70 %, 65%, 60%, 55%, 50%, 45%, 40%, 35%, 30% or 25%.

In some embodiments of the present invention, the compound of the general formula A-2 accounts for 0.1%-80% by weight of the liquid crystal composition.

Regarding the preferable content of the compound of the general formula A-2, when the viscosity of the liquid crystal composition of the present invention is kept low and the response speed is fast, it is preferable that the lower limit is slightly lower and the upper limit is slightly lower. Further, when the clearing point of the liquid crystal composition of the present invention is kept high and the temperature stability is good, it is preferable to make the lower limit value slightly lower and the upper limit value slightly lower; in addition, in order to When the absolute value of the dielectric anisotropy is to be increased while keeping the driving voltage low, it is preferable to make the lower limit value and the upper limit value slightly higher.

In some embodiments of the present invention, the compound of general formula A-2 is preferably selected from general formula A-2-4, general formula A-2-8, general formula A-2-11, general formula A-2- 12. The group consisting of compounds of general formula A-2-13 and general formula A-2-14.

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

；

；

；

；

；

；

；

；

；

；

；

；以及

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

；

；

；

；

；

；

；

；

；

；

；

;as well as

.

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

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

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

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

In some embodiments of the present invention, preferably, the light stabilizer accounts for 0-5% of the total weight of the liquid crystal composition; more preferably, the light stabilizer accounts for 0 to 1% of the total weight of the liquid crystal composition; Particularly preferably, the light stabilizer accounts for 0.01-0.1% of the total weight of the liquid crystal composition.

Another aspect of the present invention also provides a liquid crystal display device, which comprises the liquid crystal composition provided by the present invention.

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 90-110°C, more preferably 94-105°C; the range of the absolute value of the dielectric anisotropy Δε Is 4-10, preferably 4.4-8.5; the range of optical anisotropy Δn is 0.08-0.12, preferably 0.09-0.12, more preferably 0.1-0.12; average elastic constant K _{ave is} not less than 11.6; at -35°C The low temperature storage time is greater than 500 h.

Beneficial effects: the liquid crystal composition provided by the present invention also has greater optical anisotropy, lower rotational viscosity, better low-temperature storage stability, while maintaining proper clearing point and dielectric anisotropy. The larger K _ave value and larger VHR (initial) and VHR (UV) and VHR (high temperature) (ie better reliability) make the liquid crystal display device containing the liquid crystal composition of the present invention have a smaller Light scattering and high contrast are especially suitable for liquid crystal display elements driven by active matrix thin film transistors (AM-TFT).

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

Unless otherwise specified in the present invention, the ratios mentioned are weight ratios, and all temperatures are degrees Celsius.

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

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

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

The abbreviated codes of the test items in the following examples are as follows: Cp clearing point (nematic phase-isotropic phase transition temperature, °C) Δn optical anisotropy (589 nm, 25 °C) ε _⊥ perpendicular to the molecular axis Dielectric constant Δε Dielectric anisotropy (1 KHz, 25°C) γ1 Rotational viscosity (mPa.s, 25°C, unless otherwise specified) K ₁₁ Spreading elastic constant K ₂₂ Twisting elastic constant K ₃₃ Bending elastic constant K _ave Average elastic constant LTS Low temperature storage stability (℃, storage for 500 h without devitrification temperature) VHR (initial) Initial voltage retention rate (%) VHR (UV) Voltage retention rate after UV light irradiation (%) VHR (high temperature ) Voltage retention rate after keeping at high temperature for 1 h at 150℃ (%)

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

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

γ1 is tested by TOYO6254 liquid crystal physical property evaluation system; the test temperature is 25℃, the test voltage is 90 V, and the test box thickness is 20 μm.

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

(K ₁₁ +K ₂₂ +K ₃₃ ).

The VHR (initial) is tested using the TOY06254 liquid crystal property evaluation system; the test temperature is 60°C, the test voltage is 5 V, the test frequency is 6 Hz, and the test box thickness is 9 μm.

VHR (UV) is tested using TOY06254 liquid crystal property evaluation system; UV light with a wavelength of 365 nm and an energy of 6000 mJ/cm ² is used to irradiate the liquid crystal material for testing. The test temperature is 60℃ and the test voltage is 5 V. , The test frequency is 6 Hz, and the test box thickness is 9 μm.

VHR (high temperature) is tested using TOY06254 liquid crystal physical property evaluation system; the liquid crystal material is tested after being kept at a high temperature at 150℃ for 1 h, the test temperature is 60℃, the test voltage is 5 V, and the test frequency is 6 Hz. The thickness of the test box is 9 μm.

The ingredients used in the following examples can be synthesized by known methods or obtained through commercial channels. These synthesis techniques are conventional, and the obtained liquid crystal compounds are tested to meet the standards of electronic compounds.

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

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

Comparison 1

The liquid crystal composition of Comparative Example 1 was formulated according to the compounds and weight percentages listed in Table 2, which was filled between the two substrates of the liquid crystal display for performance testing. The test data is shown in the following table: Table 2 Liquid crystal composition formula and Its test performance

Example 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 the two substrates of the liquid crystal display for performance testing. The test data are shown in the following table: Table 3 Liquid crystal composition formula and Its test performance

Example 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. The test data is shown in the following table: Table 4 Liquid crystal composition formula and Its test performance

Example 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. The test data is shown in the following table: Table 5 Liquid crystal composition formula and Its test performance

Example 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. The test data is shown in the following table: Table 6 Liquid crystal composition formula and Its test performance

Example 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. The test data is shown in the following table: Table 7 Liquid crystal composition formula and Its test performance

In order to highlight the beneficial effects of the liquid crystal composition of the present invention, the inventor selected a comparative example that is similar to the example system of the present invention. It can be seen from the above Comparative Example 1 and Examples 1-5 that the liquid crystal composition provided by the present invention also has greater optical anisotropy and lower dielectric anisotropy while maintaining proper clearing point and dielectric anisotropy. Rotational viscosity, better low-temperature storage stability, larger K _ave value, and larger VHR (initial) and VHR (UV) and VHR (high temperature) (that is, better reliability), so that the present invention is included The liquid crystal display device of the liquid crystal composition has less light scattering and higher contrast, and is particularly suitable for liquid crystal display elements driven by active matrix thin film transistors (AM-TFT).

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

Claims (11)

A liquid crystal composition, the liquid crystal composition comprising:

Ⅱ; One or more compounds of general formula M

M; and one or more compounds of general formula A-2

A-2, where R ₂ represents -H, a linear alkyl group or alkoxy group containing 1-12 carbon atoms, an alkenyl group or alkenyloxy group containing 2-12 carbon atoms; R _M1 and R _M2 Each independently represents -H, a linear or branched alkyl group containing 1-12 carbon atoms,

,

or

, One or two or more non-adjacent -CH ₂ -in the linear or branched alkyl group containing 1-12 carbon atoms can be independently controlled by -CH=CH-, -C≡ C-, -O-, -CO-, -CO-O- or -O-CO- substitution; R _A2 represents a straight or branched chain alkyl group containing 1-12 carbon atoms,

,

or

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

,

or

One or more of -H may be independently replaced by -F or -Cl; 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 -; Z _A21 and Z _A22 each independently represent a single bond, -CH ₂ CH ₂ -, -CF ₂ CF ₂ -, -CO-O-, -O-CO-, -O-CO-O-, -CH=CH-, -CF=CF-, -CH ₂ O- or -OCH ₂ -; L _A21 and L _A22 each independently represent -H, an alkyl group containing 1-3 carbon atoms or halogen; X _A2 represents halogen, a halogenated alkyl group or halogenated alkoxy group containing 1-5 carbon atoms, containing 2- Haloalkenyl or haloalkenyloxy of 5 carbon atoms; ring

Means

or

; Ring

,ring

And ring

Expressed independently

or

,among them,

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

At most one -H in it may be substituted by halogen; ring

And ring

Expressed independently

,

,

or

,among them,

,

with

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

with

One or more of -H may be substituted by -CN, -F or -Cl, and -CH= may be substituted by -N= in one or more rings; a and b each independently represent an integer from 0 to 5 ; N _M1 and n _A2 each independently represent 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 n _A2 = 2 or 3, the ring

It can be the same or different, and Z _A21 can be the same or different; and the compound of the general formula M does not include the compound of the general formula II. According to the liquid crystal composition described in item 1 of the scope of the patent application, the weight percentage of the compound of the general formula II in the liquid crystal composition is 0.1%-50%. The liquid crystal composition according to item 1 or 2 of the scope of patent application, wherein the compound of general formula II is selected from the group consisting of the following compounds:

Ⅱ-1;

Ⅱ-2;

Ⅱ-3; and

Ⅱ-4, where L _x represents -H or -CH ₃ . The liquid crystal composition according to item 3 of the scope of patent application, wherein the compound of the general formula II is preferably selected from the group consisting of the compound of the general formula II-3 and the compound of the general formula II-4. The liquid crystal composition according to item 4 of the scope of patent application, wherein the liquid crystal composition contains at least two compounds of the general formula II. The liquid crystal composition according to item 5 of the patent application, wherein the liquid crystal composition contains at least two compounds of the general formula II, and at least one compound of the general formula II is selected from those of the general formula II-4 Compound. The liquid crystal composition described in item 1 of the scope of patent application, wherein the compound of the general formula M is selected from the group consisting of the following compounds:

M1;

M2;

M3;

M4;

M5;

M6;

M7;

M8;

M9;

M10;

M11;

M12;

M13;

M14;

M15;

M16;

M17;

M18;

M19;

M20;

M21;

M22;

M23; and

M24. According to the liquid crystal composition described in item 1 or 7 of the scope of patent application, the weight percentage of the compound of the general formula M in the liquid crystal composition is 0.1%-90%. The liquid crystal composition described in item 1 of the scope of patent application, wherein 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; and

A-2-15, where R _A2 represents a linear or branched alkyl group containing 1-8 carbon atoms, one of the linear or branched alkyl groups containing 1-8 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-, And one or more -H present in these groups may be independently substituted by -F or -Cl; L _A21 , L _A22 , L _A23 , L _A24 and L _A25 each independently represent -H or -F ; And X _A2 represents -F, -CF ₃ , -OCF ₃ or -CH ₂ CH ₂ CH=CF ₂ . According to the liquid crystal composition described in item 1 or 9 of the scope of patent application, the weight percentage of the compound of the general formula A-2 in the liquid crystal composition is 0.1%-80%. A display device comprising the liquid crystal composition described in any one of items 1-10 in the scope of the patent application.