TWI759641B - Liquid crystal composition and display device thereof - Google Patents

Abstract

The invention discloses a liquid crystal composition comprising: one or more compounds of general formula II; one or more compounds of general formula M; one or more compounds of general formula A-1; and one or more compounds of general formula Compounds of Formula A-2. The present invention also discloses a display device comprising the liquid crystal composition. The liquid crystal composition provided by the present invention also has larger optical anisotropy, larger dielectric anisotropy, lower rotational viscosity, better low temperature storage stability, under the condition of maintaining a proper clearing point. The larger value of _Kave , as well as the larger VHR (initial) and VHR (UV) and VHR (high temperature) (ie, better reliability), make the liquid crystal display device comprising the liquid crystal composition of the present invention have a smaller Light scattering, and high contrast ratio, are especially suitable for active matrix thin film transistor (AM-TFT) driven liquid crystal display elements.

Description

Liquid crystal composition and display device thereof

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

Liquid crystal display elements can be used in various household appliances including clocks and electronic calculators, measuring equipment, panels for automobiles, word processors, computers, printers, televisions, and the like. According to the type of display mode, it is divided into PC (phase change, phase change), TN (twist nematic, twisted nematic), STN (super twisted nematic, super twisted nematic), ECB (electrically controlled birefringence, electronically controlled birefringence), OCB (optically compensated bend), IPS (in-plane switching, coplanar transition), VA (vertical alignment, vertical alignment) and other types. According to the driving method of the components, it is divided into PM (passive matrix, passive matrix) type and AM (active matrix, active matrix) type. PM is divided into static (static) and multiplex (multiplex) and other types. AM is divided into TFT (thin film transistor, thin film transistor), MIM (metal insulator metal, metal-insulator-metal) and other types. The types of TFT are amorphous silicon (amorphous silicon) and polycrystalline silicon (polycrystal silicon). The latter are classified into high temperature type and low temperature type according to the manufacturing process. Liquid crystal display elements are classified into a reflective type using natural light, a transmissive type using a backlight, and a transflective type using both natural light and a backlight depending on the type of light source.

In low information volume, passive mode is generally used to drive, but as the information volume increases, the display size and the number of display channels increase, and the phenomenon of crosstalk and contrast reduction becomes serious, so the active matrix (AM) mode is generally used to drive. At present, thin film transistors (TFTs) are mostly used for driving. In an AM-TFT element, the TFT switching devices are addressed in a two-dimensional grid, recharging the picture element electrodes for a limited time during which they are on, and then turn off again until they are addressed again in the next cycle. Therefore, between two addressing cycles, it is not expected that the voltage on the pixel point will change, otherwise the transmittance of the pixel point will change, resulting in unstable display. The discharge rate of the feature point depends on the electrode capacity and the resistivity of the inter-electrode dielectric material. Therefore, the liquid crystal material is required to have a high resistivity, and at the same time, the liquid crystal material is required to have a suitable optical anisotropy Δn (the value of Δn is generally around 0.08-0.13), and a lower threshold voltage to reduce the driving voltage and power. 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 literatures, such as WO9202597, WO9116398, WO9302153, WO9116399, CN1157005A and the like.

， 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 _Kave is as follows: LC Scattering ∝

, where d is the pitch of the liquid crystal cell, _ne is the extraordinary ray refractive index, and _no is the ordinary ray refractive index. It can be seen from this relational expression that LC Scattering is inversely proportional to _Kave , and when the _Kave is increased, the light leakage of the liquid crystal material can be reduced.

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

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 power consumption.

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

A liquid crystal composition with a low viscosity can improve 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. Moreover, when injecting a liquid crystal composition into the liquid crystal cell of a liquid crystal display element, the injection time can be shortened, and workability|operativity can be improved.

Liquid crystal compositions with lower power consumption and faster response are disclosed in the prior art, such as patent document CN102858918A, but the liquid crystal compositions in the prior art have environmental problems (such as the use of chlorine-containing compounds), short service life (such as Poor UV or thermal stability), low contrast (such as whitening of the display screen in sunlight), and inability to take into account the requirements for proper optical anisotropy, proper dielectric anisotropy, high voltage in LCD TVs, tablet computers, etc. The performance balance of retention rate, good anti-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 properties of liquid crystal materials are mutually restrained, 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, liquid crystal displays have a great market demand in the world. They are mostly used in electronic and electrical products, but their life cycles are short. There are naturally problems such as waste and pollution in the short life cycle. Now that the green environmental protection issue has been paid more and more attention by all walks of life, if it can be controlled from the source, that is, the selection of environmentally friendly and green materials in the modulation process of liquid crystal materials, can greatly Reduce the environmental cost of disposing of discarded LCD monitors. Therefore, the preparation of liquid crystal materials with suitable performance in all aspects, economical and green, and environmental protection 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 device with a large optical anisotropy, a large dielectric anisotropy, and a low rotational viscosity while maintaining an appropriate clearing point. , better low temperature storage stability, larger _Kave value, and larger VHR (initial) and VHR (UV) and VHR (high temperature) liquid crystal composition (ie better reliability). Another object of the present invention is to provide a liquid crystal display device comprising the liquid crystal composition.

Ⅱ； 一種或多種通式M的化合物

M； 一種或多種通式A-1的化合物

A-1；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_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； 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_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、含有1-3個碳原子的烷基或鹵素； 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； 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

、環

、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 、n_A11 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_A11 =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； n_A12 表示1或2，且當n_A12 =2時，環

可以相同或不同；並且 所述通式M的化合物中並不包含通式Ⅱ的化合物。 Technical solution of the present invention: In order to achieve the above purpose of the invention, the present invention provides a liquid crystal composition, the liquid crystal composition comprising: one or more compounds of the general formula II

II; one or more compounds of general formula M

M; one or more compounds of general formula A-1

A-1; and one or more compounds of general formula A-2

A-2, wherein, R ₂ represents -H, a straight-chain alkyl or alkoxy group containing 1-12 carbon atoms, an alkenyl 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

, 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 _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 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 _A11 , Z _A21 and Z _A22 each independently represent a single bond, -CH _2CH2- , _-CF2CF2- , -CO- _O- , -O-CO-, -O- _CO -O-, -CH=CH-, -CF=CF-, _-CH2O- or -OCH ₂ -; L _A11 , L _A12 , L _A13 , L _A21 and L _A22 each independently represent -H, an alkyl group containing 1-3 carbon atoms or a halogen; X _A1 and X _A2 each independently represent a halogen, haloalkyl or haloalkoxy containing 1-5 carbon atoms, haloalkenyl or haloalkenyloxy containing 2-5 carbon atoms; ring

express

or

; 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 -Hs may be substituted by halogen; ring

,ring

,ring

and ring

represent independently

,

,

or

,in,

,

and

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

and

One or more of -H in the ring may be replaced by -CN, -F or -Cl, and -CH= may be replaced by -N= in one or more rings; a and b each independently represent an integer from 0 to 5 ; n _M1 , n _A11 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 _A11 = 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; n _A12 represents 1 or 2, and when n _A12 =2, the ring

can be the same or different; and the compounds of the general formula M do not include the compounds of the general formula II.

Regarding the preferred weight percentage of the compound of the general formula II in the liquid crystal composition of the present invention: relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of the general formula II in the liquid crystal composition of the present invention 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 is preferably an alkyl or alkoxy group containing 1-8 carbon atoms, an alkenyl or alkenyl group containing 2-8 carbon atoms ; further preferably an alkyl or alkoxy group containing 1-5 carbon atoms, an alkenyl 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 present invention, the compound of general formula II is selected from the group consisting of:

II-1;

II-2;

II-3; and

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

In some embodiments of the present invention, compounds of general formula II are preferably selected from the group consisting of compounds of general formula II-3 and II-4; compounds of general formula II-4 are particularly preferred.

In some embodiments of the present invention, the liquid crystal composition preferably contains at least one compound of formula II-4; it is particularly preferred to contain two compounds of formula II-4.

In some embodiments of the present invention, the liquid crystal composition contains at least two compounds of general formula II, wherein 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 compound of formula M has an absolute value of dielectric anisotropy of not more than 3; preferably, the absolute value of the dielectric anisotropy of the compound of formula M is not more than 2.

In some embodiments of the present invention, 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 alkoxy or straight-chain alkenyl containing 2 to 10 carbon atoms; more preferably straight-chain alkyl containing 1 to 8 carbon atoms, straight-chain alkoxy containing 1 to 7 carbon atoms base, or a straight-chain alkenyl group containing 2 to 8 carbon atoms; further preferably a straight-chain alkyl group containing 1 to 5 carbon atoms, 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 straight-chain alkenyl group containing 2 to 8 carbon atoms; further preferably, R _M1 and R _M2 each independently represent a linear alkenyl group containing 2 to 8 carbon atoms. 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 straight-chain alkyl groups containing 1-8 carbon atoms, or straight-chain alkoxy groups containing 1-7 carbon atoms ; Further preferably, both R _M1 and R _M2 are straight-chain alkyl groups containing 1 to 5 carbon atoms, or straight-chain 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 1-5 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；

M21；

M22；

M23；以及

M24。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;

M21;

M22;

M23; and

M24.

In some embodiments of the present invention, regarding the content of the compound of general formula M, the solubility at low temperature, transition temperature, electrical reliability, birefringence, process suitability, drip marks, burn-in, dielectric, etc. must be considered. It is appropriately adjusted according to the required properties such as anisotropy.

Regarding the preferred weight percentage of the compound of the general formula M in the liquid crystal composition of the present invention: relative to the total weight of the liquid crystal composition of the present invention, the preferred weight percentage of the compound of the general formula M in the liquid crystal composition of the present invention is as follows 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 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 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 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 is preferably higher, and the upper limit value 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 value is high and the upper limit value is high; When the absolute value of is large, it is preferable to make the lower limit value lower and the upper limit value lower.

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 ; 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 present invention, compounds of general formula M are particularly preferably free from 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 invention, the compound of general formula M is preferably selected from the group consisting of compounds of general formula M1, general formula M4, general formula M9, general formula M13 and general formula M20.

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

Regarding the preferred weight percent of the compound of the general formula M1 in the liquid crystal composition of the present invention: relative to the total weight of the liquid crystal composition of the present invention, the preferred weight percent of the compound of the general formula M1 in the liquid crystal composition of the present invention The lower limit is 1%, 3%, 5%, 7%, 10%, 13%, 15%, 17%, 20%, 23%, 25% or 30%; relative to the total amount of the liquid crystal composition of the present invention By 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 order to particularly improve the response time of the liquid crystal composition of the present invention, in the compound of general formula M1, R _M1 is preferably ethyl, n-propyl, butyl or pentyl, and R _M2 is methyl or methoxy. In the compound of formula M1, R _M1 is ethyl, n-propyl, butyl or pentyl, and R _M2 is the compound of ethyl or ethoxy, or in the compound of general formula M1, R _M1 is n-propyl, butyl or pentyl, and R _M2 is a compound of n-propyl or propoxy.

With respect to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percent of the compound of the general formula M1 in which R _M1 is n-propyl and R _M2 is an ethyl group in the liquid crystal composition of the present invention 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 general formula M1 is n-propyl The preferred upper limit of the weight percentage of the compound having R _M2 as ethyl group in the liquid crystal composition of the present invention is 20%, 17%, 15%, 13%, 10%, 8%, 7% or 6%.

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

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

Regarding the preferred weight percentage of the compound of general formula M9 in the liquid crystal composition of the present invention: relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of general formula M9 in the liquid crystal composition of the present invention 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 weight percentage of the compound of general formula M9 in the liquid crystal composition of the present invention is preferably 50%, 40%, 35%, 30%, 20%, 15%, 10% or 5%. %.

或

。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 M9 contains 2-4 carbon atoms The straight-chain or branched alkenyl group, and R _M2 is CH ₃ - compound, the straight-chain or branched alkenyl group containing 2-4 carbon atoms is more preferably

or

.

或

、且R_M2 為CH₃ -的化合物的占本發明的液晶組合物的重量百分比優選的下限值為1%，3%，5%，7%，9%，11%，12%，13%，18%或21%，並且優選上限值為45%，40%，35%，30%，25%，23%，20%，18%，15%，13%，10%或8%。在同時含有所述兩種化合物時，相對于本發明的液晶組合物總重量，所述兩種化合物的占本發明的液晶組合物的重量百分比優選的下限值為3%，5%，7%，9%，11%，13%，15%，19%，24%或30%，優選上限值為45%，40%，35%，30%，25%，23%，20%，18%，15%、13%、11%或9%。With respect to the total weight of the liquid crystal composition of the present invention, R _M1 in the compound of the general formula M9 is

or

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

Regarding the preferred weight percentage of the compound of general formula M10 in the liquid crystal composition of the present invention: relative to the total weight of the liquid crystal composition of the present invention, the preferred weight percentage of the compound of general formula M10 in the liquid crystal composition of the present invention is as follows Limits are 1%, 2%, 3%, 4%, 5%, 7%, 10%, 14%, 16% or 20%; with respect to the total weight of the liquid crystal composition of the 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 R _M1 in the compound containing the general formula M10 contain 2-4 carbon atoms The straight-chain or branched alkenyl group, and R _M2 is CH ₃ - compound, the straight-chain or branched alkenyl group containing 2-4 carbon atoms is more preferably

or

.

或

、且R_M2 為CH₃ -的化合物的占本發明的液晶組合物的重量百分比優選的下限值為1%，3%，4%，5%，7%，9%，11%，12%，13%，18%或20%，並且優選上限值為40%，35%，30%，25%，23%，20%，18%，15%，13%，10%或8%。在同時含有所述兩種化合物時，相對于本發明的液晶組合物的總重量，所述兩種化合物的占本發明的液晶組合物的重量百分比優選的下限值為3%，5%，7%，9%，11%，13%，15%，19%，24%或30%，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 M10 is

or

, and the preferred lower limit of the weight percentage of the compound whose R _M2 is CH ₃ - in the liquid crystal composition of the present invention is 1%, 3%, 4%, 5%, 7%, 9%, 11%, 12% , 13%, 18% or 20%, and preferably the upper limit is 40%, 35%, 30%, 25%, 23%, 20%, 18%, 15%, 13%, 10% or 8%. When the two compounds are contained at the same time, relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limits of the weight percentage of the two compounds in the liquid crystal composition of the present invention are 3%, 5%, 7%, 9%, 11%, 13%, 15%, 19%, 24% or 30%, preferably the upper limit 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 weight percentage of the compound of the general formula M11 to the liquid crystal composition of the present invention 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 general formula M11 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 weight percentage of the compound of general formula M13 in the liquid crystal composition of the present invention: relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of general formula M13 in the liquid crystal composition of the present invention value of 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 general formula M13 preferably R _M1 and R _M2 each independently represent a straight or branched chain alkyl group containing 2 to 5 carbon atoms, or preferably a compound between 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 general formula M15 in the liquid crystal composition of the present invention: relative to the total weight of the liquid crystal composition of the present invention, the preferred lower limit of the weight percentage of the compound of general formula M15 in the liquid crystal composition of the present invention Values are 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 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 general formula M16 in the liquid crystal composition of the present invention Values are 1%, 2%, 3%, 5%, 7%, 10%, 12%, 14%, 16%, 18%, 20%, 23%, 26%, 30%, 35% or 40%; 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 percentage by weight of the compounds of the general formulas M20 to M24 in the liquid crystal composition of the present invention, it is preferable: 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 the weight percentage is 1%, 2%, 3%, 5%, 7%, 10%, 14%, 16% or 20%; relative to the total weight of the liquid crystal composition of the present invention, the general formula The preferred upper limit of the compounds of M20-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-1-1；

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 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; and

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

,

or

, 1 or non-adjacent 2 or more -CH ₂ - in the linear or branched alkyl group containing 1-8 carbon atoms can be independently replaced by -CH=CH-, -C≡ C-, -O-, -CO-, -CO-O- or -O-CO- are replaced, and one or more -H present in these groups may be independently replaced by -F or -Cl, respectively ; R _v and R _w each independently represent -CH ₂ - or -O-; _LA11 , _LA12 , _LA11 ^' , _LA12 ^' , _LA14 , _LA15 and _LA16 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 general formula A-1 in the liquid crystal composition of the present invention, it is preferable to: relative to the total weight of the liquid crystal composition of the present invention, the weight percentage of the compound of general formula A-1 in the liquid crystal composition of the present invention The preferred lower limit values are 0.1%, 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 the general formula A-1 in the liquid crystal composition of the present invention is 80%, 75%, 70% %, 65%, 60%, 55%, 50%, 45%, 40%, 35%, 30% or 25%.

In some embodiments of the present invention, the compound of general formula A-1 accounts for 0.1%-80% by weight of the liquid crystal composition.

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 to make the lower limit slightly lower and the upper limit 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 order to increase the absolute value of the dielectric anisotropy while keeping the driving voltage low, it is preferable to make the lower limit value slightly higher and the upper limit value slightly higher.

In some embodiments of the present invention, the compound of general formula A-1 is preferably selected from the group consisting of general formula A-1-1, general formula A-1-4, general formula A-1-7, general formula A-1- 13. The group consisting of compounds of general formula A-1-14, general formula A-1-15, general formula A-1-16 and general formula A-1-17.

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_A21 表示-F、-CF₃ 、-OCF₃ 或-CH₂ CH₂ CH=CF₂ 。In some embodiments of the present 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, wherein R _A2 represents a linear or branched alkyl group containing 1-8 carbon atoms, and 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 can be independently replaced by -F or -Cl respectively; L _A21 , L _A22 , L _A23 , L _A24 and L _A25 each independently represent -H or - F; and X _A21 represents -F, -CF ₃ , -OCF ₃ or -CH ₂ CH ₂ CH=CF ₂ .

Regarding the weight percentage of the compound of general formula A-2 in the liquid crystal composition of the present invention, it is preferable to: relative to the total weight of the liquid crystal composition of the present invention, the weight percentage of the compound of general formula A-2 in the liquid crystal composition of the present invention The preferred lower limit values are 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 the 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 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 to make the lower limit slightly lower and the upper limit 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 order to increase the absolute value of the dielectric anisotropy while keeping the driving voltage low, it is preferable to make the lower limit value slightly higher 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 the group consisting of general formula A-2-4, general formula A-2-8, general formula A-2-11 and general formula A-2- A group of 12 compounds.

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

；

；

；

；

；

；

；

；

；

；

；

；以及

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

;

;

;

;

;

;

;

;

;

;

;

;as well as

.

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

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

Among them, n represents a positive integer from 1 to 12.

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

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

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

Beneficial effects: The liquid crystal composition provided by the present invention also has greater optical anisotropy, greater dielectric anisotropy, lower rotational viscosity, and better low-temperature storage under the condition of maintaining an appropriate clearing point. Stability, larger _Kave value, and larger VHR (initial) and VHR (UV) and VHR (high temperature) (ie, better reliability), make the liquid crystal display device comprising the liquid crystal composition of the present invention have Smaller light scattering and higher contrast ratio are especially suitable for active matrix thin film transistor (AM-TFT) driven liquid crystal display elements.

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.

In the present invention, unless otherwise specified, the stated ratios 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 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 codes of the test items in the following examples are as follows: Cp Clearing point (transition temperature of nematic phase-isotropic phase, °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 stated) K ₁₁ Splay Elastic Constant K ₂₂ Twisting Elastic Constant K ₃₃ Bending Elastic Constant K _ave Average elastic constant LTS Low temperature storage stability (℃, the temperature at which crystallization does not occur after 500 h storage) VHR (initial) Initial voltage retention (%) VHR (UV) Voltage retention after UV light irradiation (%) VHR (high temperature ) Voltage retention rate (%) after holding at high temperature for 1 h at 150°C

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, 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 instrument and anti-parallel rubbing cell to test the CV curve of liquid crystal. Test conditions: 7 μm anti-parallel rubbing cell, V=0.1~20 V; _Kave =

(K ₁₁ +K ₂₂ +K ₃₃ ).

The VHR (initial) is obtained by 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 obtained by using the TOY06254 liquid crystal physical property evaluation system; the liquid crystal material is tested after irradiating the liquid crystal material with UV light with a wavelength of 365 nm and an energy of 6000 mJ/cm ² , the test temperature is 60 °C, 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 obtained by using the TOY06254 liquid crystal physical property evaluation system; the liquid crystal material is tested at a high temperature of 150 °C for 1 h, the test temperature is 60 °C, the test voltage is 5 V, and the test frequency is 6 Hz. The test cell thickness is 9 μm.

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

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

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

Comparative ratio 1

The liquid crystal composition of Comparative Example 1 was prepared according to the compounds and weight percentages listed in Table 2, 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 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, and the liquid crystal composition 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, and it was filled between the two substrates of the liquid crystal display for performance testing. The test data are 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, and it was filled between the two substrates of the liquid crystal display for performance testing. The test data are 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, and the liquid crystal composition was filled between the two substrates of the liquid crystal display for performance testing. The test data are 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, and it was filled between the two substrates of the liquid crystal display for performance testing. The test data are shown in the following table: Table 7 Liquid crystal composition formula and its test performance

In order to highlight the beneficial effect of the liquid crystal composition of the present invention, the inventors selected a comparative example similar to the embodiment 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 greater dielectric anisotropy under the condition of maintaining an appropriate clearing point. , lower rotational viscosity, better low temperature storage stability, larger _Kave value, and larger VHR (initial) and VHR (UV) and VHR (high temperature) (ie better reliability), making The liquid crystal display device comprising the liquid crystal composition of the present invention has less light scattering and high contrast ratio, and is especially suitable for an active matrix thin film transistor (AM-TFT) driven liquid crystal display element.

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 (10)

A liquid crystal composition, the liquid crystal composition comprises: one or more compounds of general formula II, and the weight percent of the compound of general formula II in the liquid crystal composition is 3%-30%

One or more compounds of general formula M, and the compound of general formula M accounts for 10%-70% by weight of the liquid crystal composition

One or more compounds of general formula A-1, and the weight percent of the compound of general formula A-1 in the liquid crystal composition is 14%-40%

and one or more compounds of general formula A-2, and the weight percent of the compound of general formula A-2 in the liquid crystal composition is 7%-40%

Wherein, R ₂ represents -H, a straight-chain alkyl or alkoxy group containing 1-12 carbon atoms, an alkenyl or alkenyloxy group containing 2-12 carbon atoms; R _M1 and R _M2 each independently represent -H, 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 _A1 and R _A2 each independently represent a straight-chain or branched alkyl group containing 1-12 carbon atoms, One or two or more non-adjacent -CH ₂ - in the linear or branched alkyl group containing 1-12 carbon atoms can be independently replaced by -C≡C-, -O-, -CO-, -CO-O- or -O-CO- is substituted, and one or more -Hs in the straight or branched alkyl group containing 1 to 12 carbon atoms may each independently be replaced by -F or -Cl substitution; 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 _A11 , 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 _A11 , L _A12 , L _A21 and L _A22 each independently represents -H, an alkyl group containing 1-3 carbon atoms or a halogen, and L _A13 represents -H; X _A1 and X _A2 each independently represent a halogen, a halogenated alkyl group containing 1-5 carbon atoms or haloalkoxy, haloalkenyl or haloalkenyl having 2 to 5 carbon atoms; ring

express

or

; 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 -Hs may be substituted by halogen; ring

,ring

,ring

and ring

represent independently

,

,

or

,in,

,

and

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

and

One or more of -H in the ring can be replaced by -CN, -F or -Cl, and -CH= can be replaced by -N= in one or more rings; a and b each independently represent an integer from 0 to 5 ; n _M1 , n _A11 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 _A11 = 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; n _A12 represents 1 or 2, and when n _A12 =2, the ring

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 liquid crystal composition according to item 1 of the claimed scope, wherein the compound of the general formula II is selected from the group consisting of the following compounds:

;as well as

Wherein, L _x represents -H or -CH ₃ . The liquid crystal composition as described in item 2 of the claimed scope, wherein the compound of the general formula II is preferably selected from the group consisting of the compounds of the general formula II-3 and the general formula II-4. The liquid crystal composition according to item 3 of the claimed scope, wherein the liquid crystal composition contains at least one compound of the general formula II-4. The liquid crystal composition as described in item 4 of the claimed scope, wherein the liquid crystal composition contains at least two compounds of the general formula II, wherein at least one compound of the general formula II is selected from the compounds of the general formula II-4 . The liquid crystal composition according to item 5 of the claimed scope, wherein the liquid crystal composition contains at least two compounds of the general formula II-4. 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 1 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

Wherein, R _A1 represents a straight-chain or branched alkyl group containing 1-8 carbon atoms,

,

or

, 1 or non-adjacent 2 or more -CH ₂ - in the straight-chain or branched alkyl group containing 1-8 carbon atoms can be independently replaced by -CH=CH-, -C≡C -, -O-, -CO-, -CO-O- or -O-CO- are replaced, and one or more -H present in these groups may be independently replaced 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. The liquid crystal composition according to item 1 of the claimed scope, wherein the compound of the general formula A-2 is selected from the group consisting of the following compounds:

;as well as

Wherein, R _A2 represents a linear or branched alkyl group containing 1-8 carbon atoms, and one or two non-adjacent alkyl groups in the linear or branched alkyl group containing 1-8 carbon atoms The above -CH ₂ - may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-, respectively, and are present in these groups One or more -H in can be respectively independently replaced by -F or -Cl; _LA21 , _LA22 , _LA23 , _LA24 and _LA25 each independently represent -H or -F; and X _A2 represents - F, _-CF3 , _-OCF3 or _-CH2CH2CH = _{CF2 .} A display device comprising the liquid crystal composition as described in any one of items 1 to 9 of the patent application scope.