Liquid crystal compositions, liquid crystal display devices comprising the same, and their applications

Abstract

This invention provides a liquid crystal composition comprising a dibenzo derivative and a liquid crystal display device thereof. The liquid crystal composition of this invention comprises at least one compound of general formula I and at least one compound of general formula N. Compared with the prior art, the liquid crystal composition of this invention, while maintaining appropriate clearing points and appropriate optical anisotropy, exhibits a larger absolute value of dielectric anisotropy, a larger elastic constant, better transmittance, better low-temperature response speed, and longer low-temperature storage time. This results in liquid crystal display devices containing the composition exhibiting lower threshold voltage, better contrast, shorter response time, better transmittance, and better low-temperature storage stability. The liquid crystal composition of this invention has high application value in IPS mode, NFFS mode, and VA mode liquid crystal displays.

Description

Technical Field

[0001] This invention relates to the field of liquid crystal materials technology, and more specifically to a liquid crystal composition, a liquid crystal display device comprising the same, and their applications. Background Technology

[0002] Liquid crystal displays (LCDs) have experienced rapid development due to their small size, light weight, low power consumption, and excellent display quality, especially in portable electronic information products. With the increasing size of LCD screens used in portable computers, office applications, and video applications, LCDs have been able to be used for large-screen displays and have ultimately replaced cathode ray tube (CRT) displays.

[0003] Liquid crystal materials are mixtures of small organic rod-shaped molecule compounds that exhibit both the fluidity of liquids and the anisotropy of crystals at certain temperatures. Liquid crystal display devices utilize the optical and dielectric anisotropy inherent in the liquid crystal materials themselves to function.

[0004] Compared to traditional display devices and materials, liquid crystal display (LCD) materials have significant advantages: low driving voltage, minimal power consumption, high reliability, large display information capacity, color display, flicker-free operation, no harm to the human body, automated production process, low cost, ability to be manufactured into various specifications and types of LCD displays, and portability. Due to these advantages, LCD technology has profoundly impacted the field of display imaging, promoting the development of microelectronics and optoelectronic information technology. Liquid crystal materials, with their excellent optical properties and photoelectric effects, have found widespread application in numerous display scenarios.

[0005] Dibenzofuran / thiophene negative liquid crystal monomers containing cyclopentene are a relatively novel class of liquid crystal monomer materials in recent years. Compared with conventional negative monomers, cyclopentene-containing negative monomers have advantages such as good miscibility, fast response, and large K value in liquid crystal mixtures. They also typically have moderate refractive index and clearing point, showing excellent performance in both positive and negative liquid crystal materials. However, their response time at low temperatures still needs improvement.

[0006] Meanwhile, in the application of liquid crystal display devices, contrast ratio is crucial to visual effects. Generally speaking, the higher the contrast ratio, the clearer and more striking the image, and the more vivid and vibrant the colors; conversely, if the contrast ratio is low, the entire image appears hazy and dull. High contrast ratio greatly improves image clarity, detail, and grayscale performance. High-contrast products have advantages in terms of black-and-white contrast, clarity, and image integrity. Contrast ratio also significantly affects the display effect of dynamic video. Because the transitions between light and dark in dynamic images are relatively rapid, the higher the contrast ratio, the easier it is for the human eye to distinguish these transitions.

[0007] During the use of LCD panels, the flickering phenomenon caused by the polarity switching of the common electrode signal (Vcom) is generally referred to in the industry as the flicker phenomenon. The magnitude of the flicker value directly reflects the reliability of the LCD panel. Generally, the smaller the absolute value of the flicker (dB), the more prone the LCD panel is to flickering, and vice versa. Severe flickering can cause brightness fluctuations in the LCD panel, reducing display quality and causing physiological discomfort to viewers (such as eye fatigue, decreased vision, and dizziness). Therefore, the flicker value needs to be tested during the LCD monitor manufacturing process and controlled within a predetermined range.

[0008] Meanwhile, to improve the response speed of liquid crystal display devices at low temperatures, it is necessary to maximize the response time of the liquid crystal material at low temperatures. However, generally, low-viscosity liquid crystal materials have lower clearing points and optical anisotropy, so when formulating liquid crystal compositions, other performance requirements must be considered while reducing viscosity.

[0009] The formulation of liquid crystal compositions involves simultaneously adjusting many performance parameters of the liquid crystal composition. Adjusting one performance parameter of a liquid crystal composition without affecting the value of another is virtually impossible. Sometimes, adding a certain monomeric liquid crystal to adjust a certain performance parameter of the liquid crystal composition may be beneficial to one or more other properties, but may also be detrimental to the improvement of other properties. Therefore, how to obtain liquid crystal compositions that can completely or partially solve the above problems remains a pressing issue in the field. Summary of the Invention

[0010] To address the shortcomings of existing technologies, the present invention aims to provide a liquid crystal composition comprising dibenzopyran / thiophene compounds, a liquid crystal display device comprising the same, and their applications. Compared to existing technologies, the liquid crystal composition provided by the present invention, while maintaining appropriate dielectric anisotropy, good optical anisotropy, and good clearing point, possesses a large elastic constant, high transmittance, low rotational viscosity, and good flicker value. It also incorporates the performance advantages of dibenzofuran / thiophene negative liquid crystal monomer compounds containing cyclopentene disclosed in the prior art, while compensating for deficiencies in low-temperature response speed, resulting in a faster low-temperature response speed. This allows liquid crystal display devices comprising the same composition to exhibit shorter low-temperature response times, better flicker, higher contrast, and a wider operating temperature range, thus improving the display effect of liquid crystal materials. It is suitable for application in fast-response, high-contrast IPS, VA, and NFFS liquid crystal display modes.

[0011] To achieve this objective, the present invention adopts the following technical solution:

[0012] In a first aspect, the present invention provides a liquid crystal composition comprising a dibenzopyran / thiaran derivative, the liquid crystal composition comprising:

[0013] At least one compound of general formula I

[0014] as well as

[0015] At least one compound of general formula N

[0016]

[0017] in,

[0018] R1 represents -H, halogen, straight-chain or branched alkyl or alkoxy groups containing 1-12 carbon atoms. The alkyl groups containing 1-12 carbon atoms, whether straight-chain or branched, One or more non-adjacent -CH2- groups may be independently replaced by -CH=CH-, -C≡C-, -O-, -S-, -CO-, -CO-O-, or -O-CO-, and one or more -H groups may be independently replaced by -F or -Cl; one or more non-adjacent -CH2- groups in the straight-chain or branched alkoxy group containing 1-12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -S-, -CO-, -CO-O-, or -O-CO-, and one or more -H groups may be independently replaced by -F, -Cl, replace,

[0019] R x The term represents -H, a straight-chain or branched alkyl group containing 1-12 carbon atoms, wherein one or more non-adjacent -CH2- groups can be independently replaced by -CH=CH-, -C≡C-, -O-, -S-, -CO-, -CO-O-, or -O-CO-, and one or at least two -H groups can be independently replaced by -F or -Cl. x With ring Any carbon atom in the middle is connected;

[0020] R N1 and R N2 Each independently represents a straight-chain or branched alkyl group containing 1-12 carbon atoms. One or more non-adjacent -CH2- in the straight-chain 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-;

[0021] ring and ring Each represents independently or in, One or more of the -CH2- bonds can be replaced by -O- bonds, and one or more single bonds in the ring can be replaced by double bonds, wherein, One or more of the -H can be replaced by -F, -Cl, -CN, -CH3 or -OCH3, and one or more of the -CH= in the ring can be replaced by -N=;

[0022] ring express Among them, ring express

[0023] At that time, R x H represents the ring. express At this time, one or more H atoms on the benzene ring can be replaced by fluorine;

[0024] ring and ring Each represents independently in One or more of the -CH2- bonds can be replaced by -O- bonds, and one or more single bonds in the ring can be replaced by double bonds, wherein One or more of the -H can be replaced by -F, -Cl or -CN, and one or more of the -CH= in the ring can be replaced by -N=;

[0025] X1 represents -O-, -S-, -CO-, -CF2-, -NH-, or -NF-;

[0026] Y1 and Y2 each independently represent -H, halogen, alkyl halogroup or alkyl halogroup or alkoxy ...;

[0027] Z represents a single bond, -(CH2) a O- or -(CH2) a S-, where a represents an integer from 0 to 7, such as 1, 2, 3, 4, 5, etc.;

[0028] Z1 and Z2 independently represent single bonds, -O-, -S-, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, -CF2CF2-, -(CH2)4-, -CF2O-, or -OCF2-;

[0029] Z N1 and Z N2 Each can independently represent a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, -CF2CF2-, -(CH2)4-, -CF2O-, or -OCF2-;

[0030] L N1 and L N2 Each can independently represent -H, an alkyl group containing 1-3 carbon atoms, or a halogen;

[0031] n1, n2, and n3 each independently represent 0, 1, or 2. When n1 = 2, the ring... Whether they are the same or different, Z1 is the same or different, when n2 = 2, the ring Same or different, Z2 same or different, when n3 = 2, ring Same or different; and

[0032] n N1 n represents 0, 1, 2, or 3. N2 Represents 0 or 1, and 0 ≤ n N1 +n N2 ≤3, when n N1 When = 2 or 3, the ring Same or different, Z N1 Same or different.

[0033] In this invention, the expression "one or at least two -CH= in one or at least two rings can be replaced by -N=" refers to the number of -CH= replaced by -N=. This invention relates to the same expression, all of which have the same meaning.

[0034] When n1 = 2, there are two [components] in the compound. These two They can have the same structure or different structures. For example, one can be... Another one is When referring to the expressions "same or different" in this invention, they have the same meaning.

[0035] In this invention, "can be replaced by... independently" means that it can be replaced or not replaced, that is, whether it is replaced or not replaced, it is within the protection scope of this invention. Similarly, "can be replaced by... independently" means that it can be replaced by... independently, and the positions of "replace" and "substitute" can be arbitrary.

[0036] In this invention, short straight lines on one or both sides of a group structure represent an access bond, not a methyl group, for example... The short straight line on the right Short straight lines on both sides.

[0037] In this invention, the number of carbon atoms in a straight-chain or branched alkyl group containing 1-12 carbon atoms includes, but is not limited to, 2, 4, 6, 8, 10, etc.

[0038] In this invention, halogens include, but are not limited to, halogen elements such as fluorine, chlorine, bromine, or iodine.

[0039] This invention provides a novel liquid crystal composition that introduces a negative liquid crystal compound of general formula I, which, in combination with a compound of general formula N, can maintain appropriate dielectric anisotropy, good optical anisotropy, and good clearing point, while having a large elastic constant, high transmittance, low rotational viscosity, and good flicker value. As a result, the liquid crystal display device containing the composition has better contrast, shorter response time, better transmittance, and better low-temperature storage stability.

[0040] The compounds of general formula I of the present invention contain dibenzopyran or dibenzothiaran groups. Adding compounds of general formula I to liquid crystal compositions is more advantageous in maintaining appropriate clearing points and appropriate optical anisotropy, while having a larger absolute value of dielectric anisotropy, a larger elastic constant, better transmittance, faster low-temperature response speed and longer low-temperature storage time.

[0041] The present invention also surprisingly discovered that, in compounds of general formula I, when Z is an alkene group, compared with the technical solution where Z represents a straight-chain alkyl group, compounds of general formula I exhibit a stronger overall conjugation effect. After the synergistic effect of the groups within the molecule, there is a significant improvement in the absolute value of dielectric anisotropy, elastic constant, transmittance, low-temperature response time, and low-temperature storage time. This is more conducive to achieving the effects of high contrast, fast low-temperature response, high transmittance, and good low-temperature storage stability of the present invention.

[0042] In some embodiments of the present invention, the ring and ring Each represents independently

[0043] In some embodiments of the present invention, X1 represents -O-, -S-, or -CO-; preferably X1 represents -O- or -S-.

[0044] In some embodiments of the present invention, Y1 and Y2 each independently represent -H, -F, -Cl, -CN, -CH3, -OCH3, -CF3 or -OCF3; more preferably, Y1 and Y2 each independently represent -H, -F or -Cl; even more preferably, Y1 and Y2 both represent -F.

[0045] In this invention, Y1 and Y2 are preferably represented independently as -F, which is more beneficial than other substituents in improving the absolute value of dielectric anisotropy, low-temperature response speed, transmittance and low-temperature storage time of the liquid crystal composition.

[0046] In some embodiments of the present invention, X1 represents -O-, -S-, or -CO-, and Y1 and Y2 both represent -F.

[0047] In some embodiments of the present invention, a represents an integer from 0 to 3; more preferably, a represents 1 or 2.

[0048] In some embodiments of the present invention, Z1 and Z2 each independently represent a single bond, -O-, -S-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, -CF2O-, or -OCF2-.

[0049] In some embodiments of the present invention, n1 and n2 each independently represent 0 or 1; more preferably, n1 represents 0 and n2 represents 0 or 1; even more preferably, n1 and n2 each independently represent 0.

[0050] In some embodiments of the present invention, the compound of general formula I accounts for 0.1%-40% by weight of the liquid crystal composition.

[0051] In some embodiments of the present invention, in order to obtain a large absolute value of dielectric anisotropy, a large elastic constant, better transmittance, faster low-temperature response speed and longer low-temperature storage time while maintaining an appropriate clearing point and appropriate optical anisotropy, the liquid crystal composition comprises at least two compounds of general formula I.

[0052] In some embodiments of the present invention, the liquid crystal composition comprises at least one compound of general formula I with X1 being -O- and / or one compound of general formula I with X1 being -S-; more preferably, the liquid crystal composition comprises at least two compounds of general formula I with X1 being -O-.

[0053] The present invention preferably combines at least two compounds of general formula I with X1 being -O- to further improve the absolute value of dielectric anisotropy of the liquid crystal composition, low-temperature response speed, transmittance and low-temperature storage time.

[0054] In some embodiments of the present invention, X1 is -O-.

[0055] In some embodiments of the present invention, X1 is -S-.

[0056] In some embodiments of the present invention, R1 is preferably a straight-chain or branched alkyl group containing 1-10 carbon atoms, a straight-chain or branched alkoxy group containing 1-9 carbon atoms, a straight-chain or branched alkathio group containing 1-9 carbon atoms, or a straight-chain or branched alkenyl group containing 2-10 carbon atoms; R1 is further preferably a straight-chain or branched alkyl group containing 1-8 carbon atoms, a straight-chain or branched alkoxy group containing 1-7 carbon atoms, a straight-chain or branched alkathio group containing 1-7 carbon atoms, or a straight-chain or branched alkenyl group containing 2-8 carbon atoms; R1 is even further preferably a straight-chain or branched alkyl group containing 1-5 carbon atoms, a straight-chain or branched alkoxy group containing 1-4 carbon atoms, a straight-chain or branched alkathio group containing 1-4 carbon atoms, or a straight-chain or branched alkenyl group containing 2-5 carbon atoms.

[0057] In some embodiments of the present invention, R x It represents -H, a straight-chain or branched fluorinated or unfluorinated alkyl or alkoxy group containing 1-6 carbon atoms.

[0058] In some embodiments of the invention, the compound of general formula I accounts for 0.1% to 30% by weight of the liquid crystal composition (inclusive of any value or subrange within this range), for example, 0.1%, 0.3%, 0.5%, 0.7%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, or a range between any two of these values. Preferably, the compound of general formula I accounts for 0.1% to 25% by weight of the liquid crystal composition.

[0059] In some embodiments of the present invention, the ring and ring Each represents independently

[0060] In some embodiments of the present invention, the compound of general formula I is selected from any one or a combination of at least two of the following compounds:

[0061]

[0062]

[0063]

[0064]

[0065] as well as

[0066]

[0067] Wherein, R1 represents -H, halogen, or a straight-chain or branched alkyl group containing 1-12 carbon atoms. The alkyl groups containing 1-12 carbon atoms, whether straight-chain or branched, One or more non-adjacent -CH2- groups may be independently replaced by -CH=CH-, -C≡C-, -O-, -S-, -CO-, -CO-O-, or -O-CO-, and one or at least two -H groups may be independently replaced by -F or -Cl.

[0068] R x The term represents -H, a straight-chain or branched alkyl group containing 1-12 carbon atoms, wherein one or more non-adjacent -CH2- groups can be independently replaced by -CH=CH-, -C≡C-, -O-, -S-, -CO-, -CO-O-, or -O-CO-, and one or at least two -H groups can be independently replaced by -F or -Cl.

[0069] X1 represents -O-, -S-, -CO-, -CF2-, -NH-, or -NF-;

[0070] Z represents -(CH2) a O- or -(CH2) a S-, where a represents an integer from 0 to 7, such as 1, 2, 3, 4, 5, etc.

[0071] In some embodiments of the present invention, R1 represents a straight-chain or branched alkyl or alkoxy group containing 1-12 carbon atoms. The alkyl groups containing 1-12 carbon atoms, whether straight-chain or branched, One or more non-adjacent -CH2- groups may be independently replaced by -CH=CH-, -C≡C-, -O-, -S-, -CO-, -CO-O-, or -O-CO-, and one or more -H groups may be independently replaced by -F or -Cl; one or more non-adjacent -CH2- groups in the straight-chain or branched alkoxy group containing 1-12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -S-, -CO-, -CO-O-, or -O-CO-, and one or more -H groups may be independently replaced by -F, -Cl, replace.

[0072] In some embodiments of the present invention, R x The term refers to a straight-chain or branched alkyl group containing 1-12 carbon atoms, wherein one or more non-adjacent -CH2- groups may be independently replaced by -CH=CH-, -C≡C-, -O-, -S-, -CO-, -CO-O-, or -O-CO-, and one or at least two -H groups may be independently replaced by -F or -Cl.

[0073] In some embodiments of the present invention, X1 represents -O- or -S-.

[0074] In some embodiments of the present invention, Z represents a single bond, -O-, -CH2O-, or -CH2S-.

[0075] In some embodiments of the present invention, it is preferable to adjust the content of the compound of general formula I such that the liquid crystal composition containing it has a large absolute value of dielectric anisotropy, a large elastic constant, better transmittance, faster low-temperature response speed and longer low-temperature storage time while maintaining an appropriate clearing point and appropriate optical anisotropy.

[0076] In some embodiments of the invention, the compound of general formula I comprises at least one (e.g., two, three, four, or five) selected from general formula I-1, general formula I-3, general formula I-4, general formula I-6, general formula I-9, general formula I-10, general formula I-11, general formula I-14, general formula I-15, general formula I-23, general formula I-24, general formula I-25, general formula I-26, general formula I-27, and general formula I-28, in a weight percentage of 0.1% to 30% (inclusive of any value or subrange within this range) of the liquid crystal composition. Compounds of the group consisting of compounds of formula I-32, formula I-33, formula I-34, formula I-35 and / or formula I-36, preferably comprising 0.1% to 25% by weight of the liquid crystal composition (inclusive of any value or subrange within this range), for example, 0.1%, 0.3%, 0.5%, 0.7%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, or any two of these values.

[0077] In some embodiments of the present invention, compounds of general formula N are selected from the group consisting of the following compounds:

[0078]

[0079]

[0080]

[0081] Among them, R N1 and R N2 Each can independently represent a straight-chain alkyl or alkoxy group containing 1-12 carbon atoms, or a branched alkyl group containing 3-12 carbon atoms. In this context, one or more non-adjacent -CH2- groups of the straight-chain alkyl group containing 1-12 carbon atoms or the branched alkyl group containing 3-12 carbon atoms can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-.

[0082] In some embodiments of the present invention, in order to obtain a larger elastic constant, higher penetration rate, and lower rotational viscosity, the compound of general formula N contains at least one (e.g., two, three, four, or five) compounds selected from general formula N-1, general formula N-2, general formula N-5, general formula N-6, general formula N-7, general formula N-13, general formula N-15, general formula N-16, general formula N-17, and general formula N... Compounds of the group consisting of compounds of formula N-21, N-23, N-24, N-25, N-26, N-27, N-28, N-29, N-30, N-38, N-39, N-40, N-41, N-42, and N-43.

[0083] In some embodiments of the present invention, it is preferable to adjust the content of the compound of general formula N so that the liquid crystal composition containing it has a large elastic constant, high transmittance and low rotational viscosity.

[0084] In some embodiments of the present invention, R is defined as follows: N1 This refers to straight-chain alkyl or alkoxy groups containing 1-12 carbon atoms, branched alkyl groups containing 3-12 carbon atoms, and straight-chain or branched alkenyl groups containing 2-5 carbon atoms. This allows the liquid crystal composition containing it to have a large elastic constant, high transmittance, and low rotational viscosity.

[0085] In some embodiments of the present invention, the compound of general formula N accounts for 0.1% to 80% (inclusive of any value or subrange within this range) of the weight percentage of the liquid crystal composition, for example, 0.1%, 0.3%, 0.5%, 0.7%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%. The percentages are 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, or a range between any two of these values. Preferably, the compound of general formula N accounts for 0.1% to 75% of the weight percentage of the liquid crystal composition.

[0086] In some embodiments of the present invention, the liquid crystal composition comprises at least one (e.g., two, three, four, or five) compounds selected from the group consisting of compounds of general formula N-1, general formula N-2, general formula N-5, general formula N-6, general formula N-7, general formula N-13, and general formula N-41, wherein the compound comprises 0.1% to 45% (inclusive of any value or subrange within this range) of the liquid crystal composition, for example, 0.1%, 0.3%, 0.5%, or 0.7%. 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, or a range between any two of these values.

[0087] In some embodiments of the present invention, the liquid crystal composition comprises at least one (e.g., two, three, four, or five) compounds selected from the group consisting of compounds of general formula N-15, general formula N-16, general formula N-17, general formula N-21, general formula N-23, general formula N-24, general formula N-27, general formula N-28, general formula N-29, general formula N-30, general formula N-32, general formula N-38, general formula N-39, general formula N-40, general formula N-42, and / or general formula N-43, wherein the liquid crystal composition comprises, by weight, a compound of general formula N-15, general formula N-16, general formula N-17, general formula N-21, general formula N-23, general formula N-24, general formula N-27, general formula N-28, general formula N-29, general formula N-30, general formula N-32, general formula N-32, and / or general formula N-43. The percentage is 0.1% to 45% (inclusive of any value or subrange within this range), for example, 0.1%, 0.3%, 0.5%, 0.7%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, or a range between any two of these values.

[0088] In some embodiments of the present invention, the liquid crystal composition comprises at least one compound of general formula M:

[0089]

[0090] in,

[0091] R M1 and R M2 Each independently represents a straight-chain or branched alkyl group containing 1-12 carbon atoms. One or more non-adjacent -CH2- in the straight-chain 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-;

[0092] ring ring and ring Each represents independently in, One or more of the -CH2- bonds can be replaced by -O- bonds, and one or more single bonds in the ring can be replaced by double bonds, wherein, At most one -H in the halogen can be replaced by a halogen;

[0093] Z M1 and Z M2 Each can independently represent a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -C≡C-, -CH=CH-, -CH2CH2-, or -(CH2)4-; and

[0094] n M Represents 0, 1, or 2, when n M When = 2, ring Same or different, Z M2 Same or different.

[0095] The alkenyl group in this invention is preferably selected from any group represented by formula (V1) to (V9), and particularly preferably formula (V1), formula (V2), formula (V8), or (V9). The groups represented by formulas (V1) to (V9) are shown below:

[0096]

[0097] In this context, * represents a carbon atom in the bonded ring structure.

[0098] The olefinic group in this invention is preferably selected from any group represented by formula (OV1) to (OV9), and particularly preferably formula (OV1), formula (OV2), formula (OV8), or formula (OV9). The groups represented by formulas (OV1) to (OV9) are as follows:

[0099]

[0100] In this context, * represents a carbon atom in the bonded ring structure.

[0101] In some embodiments of the present invention, the compound of general formula M is selected from any one or a combination of at least two of the following compounds:

[0102]

[0103]

[0104] as well as

[0105]

[0106] In some embodiments of the present invention, the structure or content of the compound of general formula M needs to be appropriately adjusted according to the required properties such as solubility at low temperature, transition temperature, electrical reliability, birefringence, process adaptability, drip marks, burn-in, dielectric anisotropy, etc.

[0107] In some embodiments of the present invention, RM1 and R M2 Preferably, each is independently a straight-chain alkyl group containing 1-10 carbon atoms, a straight-chain alkoxy group containing 1-9 carbon atoms, or a straight-chain alkenyl group containing 2-10 carbon atoms; R M1 and R M2 Further preferably, each is independently a straight-chain alkyl group containing 1-8 carbon atoms, a straight-chain alkoxy group containing 1-7 carbon atoms, or a straight-chain alkenyl group containing 2-8 carbon atoms; R M1 and R M2 Further preferred are straight-chain alkyl groups containing 1-5 carbon atoms, straight-chain alkoxy groups containing 1-4 carbon atoms, or straight-chain alkenyl groups containing 2-5 carbon atoms.

[0108] In some embodiments of the present invention, R M1 and R M2 Preferably, each alkenyl group is a straight-chain alkenyl group containing 2-8 carbon atoms, and more preferably, each alkenyl group is a straight-chain alkenyl group containing 2-5 carbon atoms.

[0109] In some embodiments of the present invention, R M1 and R M2 One of them is a straight-chain alkenyl group containing 2-5 carbon atoms, while the other is a straight-chain alkyl group containing 1-5 carbon atoms.

[0110] In some embodiments of the present invention, R M1 and R M2 Preferably, each is an alkyl group containing 1-8 carbon atoms or an alkoxy group containing 1-7 carbon atoms; more preferably, each is an alkyl group containing 1-5 carbon atoms or an alkoxy group containing 1-4 carbon atoms.

[0111] In some embodiments of the present invention, R M1 and R M2 Either of them 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, or a straight-chain alkoxy group containing 1-4 carbon atoms; more preferably, R M1 and R M2 Both are independently straight-chain alkyl groups containing 1-5 carbon atoms.

[0112] In some embodiments of the present invention, when reliability is a priority, R is preferred. M1 and R M2 All are alkyl groups; when reducing the volatility of the compound is of priority, R is preferred. M1 and R M2 All are alkoxy groups; when viscosity reduction is a priority, R is preferred.M1 and R M2 At least one of them is an alkenyl group.

[0113] In some embodiments of the present invention, the compound of general formula M comprises any one or a combination of at least two of the compounds of general formula M-1, general formula M-2, general formula M-4, general formula M-6, general formula M-9, general formula M-11, general formula M-12, general formula M-13, general formula M-14, general formula M-15, general formula M-16, general formula M-19, general formula M-21, general formula M-26, general formula M-28, general formula M-29 and general formula M-30.

[0114] In some embodiments of the invention, the compound of general formula M comprises at least one compound of general formula M-12 and / or general formula M-16, and R in general formula M-12 and / or general formula M-16 M1 and R M2 At least one of them is an alkenyl group.

[0115] In some embodiments of the present invention, the compound of general formula M accounts for 0.1%-80% of the liquid crystal composition by weight, for example 1%, 2%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, 50%, 52%, 54%, 56%, 58%, 60%, 62%, 64%, 66%, 68%, 70%, 72%, 74%, 76%, 78%, etc.; preferably, the compound of general formula M accounts for 1%-60% of the liquid crystal composition by weight; more preferably, the compound of general formula M accounts for 5%-60% of the liquid crystal composition by weight.

[0116] Regarding the content of compounds of general formula M, when it is necessary to maintain a low viscosity and a short response time in the liquid crystal composition of the present invention, it is preferable to have a higher lower limit and a higher upper limit; further, when it is necessary to maintain a high clearing point and good temperature stability in the liquid crystal composition of the present invention, it is preferable to have a higher lower limit and a higher upper limit; and when it is necessary to maintain a low driving voltage and increase the absolute value of dielectric anisotropy, it is preferable to have a lower lower limit and a lower upper limit.

[0117] In addition to the compounds mentioned above, the liquid crystal compositions of the present invention may also contain conventional nematic liquid crystals, smectic liquid crystals, cholesteric liquid crystals, antioxidants, ultraviolet absorbers, infrared absorbers, polymerizable monomers, or light stabilizers.

[0118] The following shows possible dopants that are preferably added to the liquid crystal composition according to the invention.

[0119] as well as

[0120] In this context, * represents the position of a chiral carbon atom.

[0121] In some embodiments of the present invention, the dopant accounts for 0%-5% of the weight percentage of the liquid crystal composition; preferably, the dopant accounts for 0.01%-1% of the weight percentage of the liquid crystal composition.

[0122] Furthermore, the antioxidants, light stabilizers, and other additives used in the liquid crystal composition of the present invention are preferably the following substances:

[0123]

[0124]

[0125]

[0126] Where n represents a positive integer from 1 to 12, such as 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, etc.

[0127] Preferably, the light stabilizer is selected from the light stabilizers shown below:

[0128]

[0129] In some embodiments of the present invention, the light stabilizer accounts for 0%-5% of the total weight percentage of the liquid crystal composition; preferably, the light stabilizer accounts for 0.01%-1% of the total weight percentage of the liquid crystal composition; more preferably, the light stabilizer accounts for 0.01%-0.1% of the total weight percentage of the liquid crystal composition.

[0130] In a second aspect, the present invention provides a liquid crystal display device comprising the liquid crystal composition described in the first aspect.

[0131] Compared with the prior art, the present invention has the following beneficial effects:

[0132] The liquid crystal composition of the present invention, while maintaining appropriate clearing point and appropriate optical anisotropy, has a large absolute value of dielectric anisotropy, a large perpendicular dielectric, a large ratio of perpendicular dielectric to absolute dielectric, and a large K. ave Its high transmittance and long low-temperature storage time result in liquid crystal display devices containing it having a low threshold voltage, good contrast, short response time at room temperature and low temperature, good flicker, high transmittance and good low-temperature storage stability, making it highly valuable for applications in IPS, VA and NFFS type liquid crystal displays. Detailed Implementation

[0133] 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 used only to illustrate the invention, not to limit it. Other combinations and various modifications within the scope of the present invention can be made without departing from its spirit or scope.

[0134] For ease of explanation, in the following embodiments, the group structures of the liquid crystal compositions are represented by the codes listed in Table 1:

[0135] Table 1. Group structure codes of liquid crystal compounds

[0136]

[0137]

[0138] Take the following compound with the following structural formula as an example:

[0139]

[0140] 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 in the alkyl group at the left end. For example, if n is "3", it means that the alkyl group is -C3H7. In the code, C represents cyclohexyl, G represents 2-fluoro-1,4-phenylene, and F represents fluorine.

[0141] The abbreviated codes for the test items in the following examples are as follows:

[0142] Cp (Clearing point, nematic-isotropic phase transition temperature, °C)

[0143] Δn Optical anisotropy (589nm, 25℃)

[0144] Δε dielectric anisotropy (1 kHz, 25 °C)

[0145] LTS (-40℃) Low-temperature storage stability (stored at -40℃ and observed for more than 240 hours, h)

[0146] K 11 Elastic constant of the stretching curve (25℃)

[0147] K 33 Bending elastic constant (25℃)

[0148] Flicker (dB) - Flicker value (logarithmic value)

[0149] γ1 Rotational viscosity (25℃)

[0150] RT(25℃) Response time at 25℃ (ms)

[0151] RT (-30℃) -30℃ response time (ms)

[0152] Tr %

[0153] CR contrast ratio (bright-state transmittance / dark-state transmittance)

[0154] in,

[0155] Cp: ​​Measured using an MP70 melting point apparatus.

[0156] Δn: Measured using an Abbe refractometer under a sodium lamp (589nm) light source at 25℃.

[0157] Δε: Δε = ε ∥ -ε ⊥ , where ε ∥ ε is the dielectric constant parallel to the molecular axis. ⊥ The dielectric constant is perpendicular to the molecular axis. Test conditions: 25℃, 1KHz, VA type test box, box thickness 5.8μm.

[0158] K 11 and K 33 The CV curve of the liquid crystal was obtained by testing and calculating using an LCR meter and a reverse parallel friction cell; test conditions: VA type test cell, cell thickness 5.8μm, V = 0.1~20V.

[0159] Flicker value: Tested using a DMS505 tester in Flicker mode, and the logarithm of the test value is obtained. The larger the absolute value of the Flicker (dB) value, the less flicker there is and the better the display effect. Test conditions: 20℃, 40HZ, 127 grayscale voltage drive, negative FFS type test box with a box thickness of 3μm.

[0160] LTS (-40℃): The time recorded when crystal precipitation is observed after placing the nematic liquid crystal medium in a 7µm antiparallel cell and storing it at a constant temperature of -40℃.

[0161] Tr%: The VT curve of the dimming device was tested using a DMS 505 optoelectronic comprehensive tester. The maximum transmittance on the VT curve was taken as the transmittance of the liquid crystal. The test cell was a negative FFS type with a cell thickness of 5.8μm.

[0162] RT (25℃): Response time at room temperature, obtained by testing at 25℃ using a DMS505 tester. Test conditions: 25℃, V100 drive, negative FFS test box with a thickness of 3.0μm.

[0163] RT (-30℃): Low temperature response time, obtained by testing at -30℃ using a DMS505 tester. Test conditions: 25℃, V100 drive, negative FFS type test box with a box thickness of 3.0μm.

[0164] All components used in the following embodiments can be synthesized using known methods or obtained commercially. These synthesis techniques are conventional, and the resulting liquid crystal compounds have been tested and found to meet electronic compound standards.

[0165] Liquid crystal compositions were prepared according to the proportions of the liquid crystal compositions specified in the following examples. The liquid crystal compositions were prepared using conventional methods in the art, such as mixing in specified proportions by heating, ultrasound, or suspension.

[0166] 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.

[0167] Comparative Example 1

[0168] The liquid crystal composition of Comparative Example 1 was prepared according to the compounds listed in Table 2 and their weight percentages, and was filled between the two substrates of the liquid crystal display for performance testing.

[0169] Table 2. Formulation and performance parameter test results of liquid crystal compositions

[0170]

[0171] Example 1

[0172] The liquid crystal composition of Example 1 was prepared according to the compounds listed in Table 3 and their weight percentages, and was filled between the two substrates of the liquid crystal display for performance testing.

[0173] Table 3. Formulation and performance parameter test results of the liquid crystal composition.

[0174]

[0175]

[0176] Example 2

[0177] The liquid crystal composition of Comparative Example 2 was prepared according to the compounds and their weight percentages listed in Table 4, and was filled between the two substrates of the liquid crystal display for performance testing.

[0178] Table 4. Formulation and performance parameter test results of liquid crystal compositions

[0179]

[0180] Example 3

[0181] The liquid crystal composition of Example 3 was prepared according to the compounds and their weight percentages listed in Table 5, and was filled between the two substrates of the liquid crystal display for performance testing.

[0182] Table 5. Formulation and performance parameter test results of the liquid crystal composition.

[0183]

[0184] Example 4

[0185] The liquid crystal composition of Comparative Example 3 was prepared according to the compounds listed in Table 6 and their weight percentages, and was filled between the two substrates of the liquid crystal display for performance testing.

[0186] Table 6. Formulation and performance parameter test results of the liquid crystal composition

[0187]

[0188] Example 5

[0189] The liquid crystal composition of Example 3 was prepared according to the compounds listed in Table 7 and their weight percentages, and was filled between the two substrates of the liquid crystal display for performance testing.

[0190] Table 7. Formulation and performance parameter test results of the liquid crystal composition.

[0191]

[0192] Example 6

[0193] The liquid crystal composition of Example 6 was prepared according to the compounds and their weight percentages listed in Table 8, and was filled between the two substrates of the liquid crystal display for performance testing.

[0194] Table 8. Formulation and performance parameter test results of the liquid crystal composition.

[0195]

[0196]

[0197] Example 7

[0198] The liquid crystal composition of Example 7 was prepared according to the compounds listed in Table 9 and their weight percentages, and was filled between the two substrates of the liquid crystal display for performance testing.

[0199] Table 9. Formulation and Performance Parameter Test Results of Liquid Crystal Compositions

[0200]

[0201] Example 8

[0202] The liquid crystal composition of Example 8 was prepared according to the compounds listed in Table 10 and their weight percentages, and was filled between the two substrates of the liquid crystal display for performance testing.

[0203] Table 10. Formulation and performance parameter test results of liquid crystal compositions

[0204]

[0205]

[0206] As can be seen from the comparative examples and Comparative Example 1, compared with the comparative example, the application of the compound containing the general formula I of the present invention into the liquid crystal composition can improve the absolute value of dielectric anisotropy, elastic constant, low temperature response speed, transmittance and low temperature storage time of the liquid crystal composition while maintaining an appropriate clearing point and appropriate optical anisotropy.

[0207] In summary, the liquid crystal composition of the present invention, under the conditions of a high clearing point and appropriate optical anisotropy, has a large absolute value of dielectric anisotropy, a large elastic constant, good transmittance, fast response speed and long low-temperature storage time. This results in liquid crystal display devices containing the composition having a low threshold voltage, good contrast, short room temperature and low temperature response time, good flicker, good transmittance and good low-temperature storage stability. It has high application value in IPS mode, NFFS mode and VA mode liquid crystal displays.

[0208] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A liquid crystal composition comprising a dibenzopyran / thiaran derivative, said liquid crystal composition comprising: At least one compound of general formula I as well as At least one compound of general formula N in, R1 represents -H, halogen, straight-chain or branched alkyl or alkoxy groups containing 1-12 carbon atoms. The alkyl groups containing 1-12 carbon atoms, whether straight-chain or branched, One or more non-adjacent -CH2- groups can be independently replaced by -CH=CH-, -C≡C-, -O-, -S-, -CO-, -CO-O-, or -O-CO-, and the alkyl group containing 1-12 carbon atoms is a straight-chain or branched alkyl group. One or at least two -H atoms in the alkoxy group can be independently replaced by -F or -Cl; one or more non-adjacent -CH2- atoms in the straight-chain or branched alkoxy group containing 1-12 carbon atoms can be independently replaced by -CH=CH-, -C≡C-, -O-, -S-, -CO-, -CO-O-, or -O-CO-, and one or at least two -H atoms in the straight-chain or branched alkoxy group containing 1-12 carbon atoms can be independently replaced by -F, -Cl, replace, R x The term represents -H, a straight-chain or branched alkyl group containing 1-12 carbon atoms, wherein one or more non-adjacent -CH2- groups can be independently replaced by -CH=CH-, -C≡C-, -O-, -S-, -CO-, -CO-O-, or -O-CO-, and one or at least two -H groups can be independently replaced by -F or -Cl. x With ring Any carbon atom in the middle is connected; R N1 and R N2 Each independently represents a straight-chain or branched alkyl group containing 1-12 carbon atoms. One or more non-adjacent -CH2- in the straight-chain 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-; ring and ring Each represents independently in, One or more of the -CH2- bonds can be replaced by -O- bonds, and one or more single bonds in the ring can be replaced by double bonds, wherein, One or more of the -H can be replaced by -F, -Cl, -CN, -CH3 or -OCH3, and one or more of the -CH= in the ring can be replaced by -N=; ring express Among them, ring express At that time, R x H represents the ring. express At this time, one or more H atoms on the benzene ring can be replaced by fluorine; ring and ring Each represents independently in One or more of the -CH2- bonds can be replaced by -O- bonds, and one or more single bonds in the ring can be replaced by double bonds, wherein One or more of the -H can be replaced by -F, -Cl or -CN, and one or more of the -CH= in the ring can be replaced by -N=; X1 represents -O-, -S-, -CO-, -CF2-, -NH-, or -NF-; Y1 and Y2 each independently represent -H, halogen, alkyl halogroup or alkyl halogroup or alkoxy ...; Z represents a single bond, -(CH2) a O- or -(CH2) a S-, where a represents an integer from 0 to 7; Z1 and Z2 independently represent single bonds, -O-, -S-, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, -CF2CF2-, -(CH2)4-, -CF2O-, or -OCF2-; Z N1 and Z N2 Each can independently represent a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, -CF2CF2-, -(CH2)4-, -CF2O-, or -OCF2-; L N1 and L N2 Each can independently represent -H, halogen, or alkyl group containing 1-3 carbon atoms; n1, n2, and n3 each independently represent 0, 1, or 2. When n1 = 2, the ring... Whether they are the same or different, Z1 is the same or different, when n2 = 2, the ring Same or different, Z2 same or different, when n3 = 2, ring Same or different; and n N1 n represents 0, 1, 2, or 3. N2 Represents 0 or 1, and 0 ≤ n N1 +n N2 ≤3, when n N1 When = 2 or 3, the ring Same or different, Z N1 Same or different.

2. The liquid crystal composition according to claim 1, characterized in that, X1 represents -O-, -S-, or -CO-; preferably X1 represents -O- or -S-. Y1 and Y2 each independently represent -H, -F, -Cl, -CH3, -OCH3, -CF3 or -OCF3; preferably, Y1 and Y2 each independently represent -H, -F or -Cl; preferably, both Y1 and Y2 represent -F; Preferably, X1 represents -O-, -S-, or -CO-, and Y1 and Y2 both represent -F.

3. The liquid crystal composition according to claim 1 or 2, characterized in that, The compound of general formula I accounts for 0.1%-40% of the weight percentage of the liquid crystal composition.

4. The liquid crystal composition according to any one of the preceding claims, characterized in that, The compound of general formula I is selected from any one or a combination of at least two of the following compounds: as well as in, R1 represents -H, halogen, or a straight-chain or branched alkyl or alkoxy group containing 1-12 carbon atoms. The alkyl groups containing 1-12 carbon atoms, whether straight-chain or branched, One or more non-adjacent -CH2- groups may be independently replaced by -CH=CH-, -C≡C-, -O-, -S-, -CO-, -CO-O-, or -O-CO-, and one or more -H groups may be independently replaced by -F or -Cl; one or more non-adjacent -CH2- groups in the straight-chain or branched alkoxy group containing 1-12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -S-, -CO-, -CO-O-, or -O-CO-, and one or more -H groups may be independently replaced by -F, -Cl, replace; R x The term represents -H, a straight-chain or branched alkyl group containing 1-12 carbon atoms, wherein one or more non-adjacent -CH2- groups can be independently replaced by -CH=CH-, -C≡C-, -O-, -S-, -CO-, -CO-O-, or -O-CO-, and one or at least two -H groups can be independently replaced by -F or -Cl. Z represents -(CH2) a O- or -(CH2) a S-, where a represents an integer from 0 to 7.

5. The liquid crystal composition according to any one of claims 1-4, characterized in that, The compound of general formula I accounts for 0.1%-30% of the weight percentage of the liquid crystal composition. Preferably, the compound of general formula I comprises at least one compound selected from general formula I-1, general formula I-3, general formula I-4, general formula I-6, general formula I-9, general formula I-10, general formula I-11, general formula I-14, general formula I-15, general formula I-23, general formula I-24, general formula I-25, general formula I-26, general formula I-27, general formula I-32, general formula I-33, general formula I-34, general formula I-35, and general formula I-35, accounting for 0.1%-30% of the weight percentage of the liquid crystal composition. The compound is preferably a compound selected from the group consisting of compounds of general formula I-36, and the at least one compound selected from the group consisting of compounds of general formula I-1, general formula I-3, general formula I-4, general formula I-6, general formula I-9, general formula I-10, general formula I-11, general formula I-14, general formula I-15, general formula I-23, general formula I-24, general formula I-25, general formula I-26, general formula I-27, general formula I-32, general formula I-33, general formula I-34, general formula I-35 and general formula I-36 accounts for 0.1% to 25% by weight of the liquid crystal composition.

6. The liquid crystal composition according to any one of claims 1-5, characterized in that, The liquid crystal composition comprises at least two compounds of general formula I.

7. The liquid crystal composition according to any one of claims 1-6, characterized in that, The compound of general formula N is selected from any one or a combination of at least two of the following compounds: in, R N1 and R N2 Each can independently represent a straight-chain alkyl or alkoxy group containing 1-12 carbon atoms, or a branched alkyl group containing 3-12 carbon atoms. Wherein, one or more non-adjacent -CH2- of the straight-chain alkyl containing 1-12 carbon atoms and the branched alkyl containing 3-12 carbon atoms can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-. Preferably, the compound of general formula N comprises at least one compound selected from the group consisting of compounds of general formula N-1, general formula N-2, general formula N-5, general formula N-6, general formula N-7, general formula N-13, general formula N-15, general formula N-16, general formula N-17, general formula N-21, general formula N-23, general formula N-24, general formula N-25, general formula N-26, general formula N-27, general formula N-28, general formula N-29, general formula N-30, general formula N-38, general formula N-39, general formula N-40, general formula N-41, general formula N-42, and general formula N-43. Preferably, R N1 This refers to straight-chain alkyl or alkoxy groups containing 1-12 carbon atoms, branched alkyl groups containing 3-12 carbon atoms, and straight-chain or branched alkenyl groups containing 2-5 carbon atoms. Preferably, the compound of general formula N accounts for 0.1%-80% of the weight percentage of the liquid crystal composition. Preferably, the compound of general formula N accounts for 0.1%-75% of the weight percentage of the liquid crystal composition; Preferably, the liquid crystal composition comprises at least one compound selected from the group consisting of a compound of general formula N-1, a compound of general formula N-2, a compound of general formula N-5, a compound of general formula N-6, a compound of general formula N-7, a compound of general formula N-13, and a compound of general formula N-41, wherein the compound comprises 0.1% to 45% by weight of the liquid crystal composition. Preferably, the liquid crystal composition comprises at least one compound selected from the group consisting of compounds of general formula N-15, general formula N-16, general formula N-17, general formula N-21, general formula N-23, general formula N-24, general formula N-27, general formula N-28, general formula N-29, general formula N-30, general formula N-32, general formula N-38, general formula N-39, general formula N-40, general formula N-42 and / or general formula N-43, wherein the compound comprises 0.1% to 45% by weight of the liquid crystal composition.

8. The liquid crystal composition according to any one of claims 1-7, characterized in that, The liquid crystal composition comprises at least one compound of general formula M: in, R M1 and R M2 Each independently represents a straight-chain or branched alkyl group containing 1-12 carbon atoms. One or more non-adjacent -CH2- in the straight-chain 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-; ring ring and ring Each represents independently in, One or more of the -CH2- bonds can be replaced by -O- bonds, and one or more single bonds in the ring can be replaced by double bonds, wherein, At most one -H in the halogen can be replaced by a halogen; Z M1 and Z M2 Each can independently represent a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -C≡C-, -CH=CH-, -CH2CH2-, or -(CH2)4-; and n M Represents 0, 1, or 2, when n M When = 2, ring Same or different, Z M2 Same or different; Preferably, the compound of general formula M is selected from any one or a combination of at least two of the following compounds: as well as Preferably, the compound of general formula M accounts for 0.1%-80% of the weight percentage of the liquid crystal composition.

9. A liquid crystal display device comprising the liquid crystal composition according to any one of claims 1-8.

10. The liquid crystal composition according to any one of claims 1-8 is used in a liquid crystal display device, particularly in IPS, VA, and NFFS liquid crystal display modes.

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