Liquid crystal composition, liquid crystal display device containing liquid crystal composition and application of liquid crystal display device

Abstract

The invention relates to a liquid crystal composition, a liquid crystal display device containing the liquid crystal composition and application of the liquid crystal composition. The liquid crystal composition comprises at least one compound containing a cyclohexene structure and shown in a general formula I and at least one positive polarity N-type compound containing an oxygen-substituted cyclohexane structure. The N-type compound is selected from a group consisting of a compound with a general formula N-1 and a compound with a general formula N-2. On the basis of maintaining a high clearing point, proper optical anisotropy and proper dielectric anisotropy, the liquid crystal composition has a large elastic constant, a high contrast ratio and a good Flicker value, the display effect of a liquid crystal material can be effectively improved, and the display effect of the liquid crystal material is improved. A liquid crystal display device comprising the liquid crystal composition has a small threshold voltage and a wide temperature application range, and can be widely applied to a high-contrast and fast-response IPS liquid crystal display mode.

Description

Technical Field

[0001] The present invention belongs to the technical field of liquid crystal materials, and particularly relates to a liquid crystal composition, a liquid crystal display device comprising the same, and their applications. Background Art

[0002] Liquid Crystal Displays (LCDs) have developed rapidly due to their small size, light weight, low power consumption, and excellent display quality. Compared with traditional display devices and materials, liquid crystal display materials have obvious advantages: low driving voltage, low power consumption, high reliability, large display information capacity, color display, no flicker, harmless to the human body, automated production process, low cost, can be made into various specifications and types of liquid crystal displays, and are easy to carry. Due to these advantages, liquid crystal display technology has had a profound impact on the field of display imaging, promoting the development of microelectronics technology and optoelectronic information technology. Liquid crystal materials have been widely used in many display applications due to their good optical properties and photoelectric effects. However, there are still some problems to be solved in their applications, such as improving viewing angle characteristics, increasing contrast ratio, and enhancing elastic constants.

[0003] Research shows that the most important factor affecting the contrast ratio of liquid crystal display elements is the light leakage of liquid crystal materials, and the main factor affecting light leakage is light scattering (LC Scattering), where the relationship between LC Scattering and the average elastic constant K ave is as follows:

[0004]

[0005] where d represents the cell gap of the liquid crystal cell, n e represents the extraordinary light refractive index, and n o represents the ordinary light refractive index. From this relationship, it can be seen that LC Scattering is inversely proportional to K ave and in the case of increasing K ave , the light leakage of liquid crystal materials can be reduced. In addition, the relationship between the contrast ratio (CR) and the luminance (L) is as follows:

[0006] CR = L 255 / L0 × 100%,

[0007] where L 255 is the on-state luminance and L0 is the off-state luminance. It can be seen that the change of L0 should significantly affect CR. In the off-state, L0 has nothing to do with the dielectric properties of liquid crystal molecules, but is related to the LC Scattering of the liquid crystal material itself; the smaller the LC Scattering, the smaller L0, and thus CR will be significantly improved.

[0008] In view of the above situation, a common method for improving the transmittance of liquid crystal materials in the positive IPS mode can increase the value of the elastic constant K of the liquid crystal composition, making the order degree of liquid crystal molecules better, with less light leakage, thus higher contrast and increased transmittance. On the other hand, due to the increase in the K value, the Flicker value of the liquid crystal can also be improved.

[0009] During the use of a liquid crystal panel, due to the polarity switching of the common electrode signal (Vcom), a horizontal stripe flickering phenomenon occurs, which is generally referred to as the Flicker phenomenon in the industry. Among them, the numerical value of the Flicker value also directly reflects the quality reliability of the liquid crystal panel. Usually, the larger the numerical value of the Flicker value, the easier it is for the liquid crystal panel to generate image sticking (IS), and vice versa, it reduces / prevents image sticking. When the Flicker phenomenon is serious, it will lead to increased image sticking on the liquid crystal panel, reduce the display quality, and cause physical discomfort to viewers (such as eye fatigue, vision decline, and dizziness, etc.). Therefore, during the production process of liquid crystal displays, it is necessary to detect its Flicker value and control its Flicker value within a predetermined range.

[0010] Contrast is an important parameter of liquid crystal display devices. The contrast of liquid crystal display devices is actually the ratio of brightness, that is, the quotient obtained by dividing the units of the darkest and the whitest brightness. More precisely, contrast is obtained by subtracting the white signal at 100% and 0% saturation and then dividing by the white value at 0% in units of Lux (illuminance, i.e., lux) (the 0% white signal is actually black). Therefore, the brighter the white and the darker the black, the higher the contrast. At a reasonable brightness value, the higher the contrast of the liquid crystal display device, the richer the color levels it can display. Summary of the Invention

[0011] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a liquid crystal composition, a liquid crystal display device containing the same, and its applications. The liquid crystal composition provided by the present invention has a large elastic constant, a high contrast, and a good Flicker value on the basis of maintaining a high clearing point, an appropriate optical anisotropy, and an appropriate dielectric anisotropy, which can effectively improve the display effect of liquid crystal materials, making the liquid crystal display device containing the same have a small threshold voltage and a wide temperature range of use.

[0012] To achieve this purpose, the present invention adopts the following technical solutions:

[0013] In the first aspect, the present invention provides a liquid crystal composition, which comprises: at least one compound of general formula I:

[0014] and

[0015] at least one N-type compound selected from the group consisting of compounds of general formula N-1 and compounds of general formula N-2:

[0016]

[0017] wherein, R X1 and R X2 each independently represents a straight-chain or branched-chain alkyl group containing 1-12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms, one or more non-adjacent -CH2- in the straight-chain or branched-chain alkyl group containing 1-12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO- respectively;

[0018] ring and ring each independently represents and at least one of ring ring represents

[0019] R N1 and R N2 each independently represents -H, a straight-chain or branched-chain alkyl group containing 1-12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12) carbon atoms, one or more non-adjacent -CH2- in the straight-chain or branched-chain alkyl group containing 1-12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO- respectively; one or more -H in the foregoing groups may be independently replaced by -F or -Cl;

[0020] ring ring ring and ring each independently represents the one or more -CH2- therein may be replaced by -O-, and one or more single bonds in the ring may be replaced by double bonds; one or more -CH= in the ring may be replaced by -N=; one or more -H in the foregoing groups may be independently replaced by -F, -Cl or -CN;

[0021] wherein, the compound of general formula N-1 contains at least one (e.g., may be two)

[0022] The compound of general formula N-2 contains at least one (for example, it can be two)

[0023] Z N11 、Z N21 and Z N22 each independently represents a single bond, -CH2CH2-, -CF2CF2-, -CO-O-, -O-CO-, -O-CO-O-, -CH=CH-, -CF=CF-, -CH2O- or -OCH2-;

[0024] L N11 、L N12 、L N13 、L N21 and L N22 each independently represents -H, a halogen, or an unsubstituted or halogenated straight-chain alkyl group containing 1-3 (for example, 1, 2, or 3) carbon atoms;

[0025] X N1 and X N2 each independently represents a halogen, a halogenated alkyl group containing 1-5 (for example, 1, 2, 3, 4, or 5) carbon atoms, a halogenated alkoxy group containing 1-5 (for example, 1, 2, 3, 4, or 5) carbon atoms, a halogenated alkenyl group containing 2-5 (for example, 2, 3, 4, or 5) carbon atoms, or a halogenated alkenyloxy group containing 2-5 (for example, 2, 3, 4, or 5) carbon atoms;

[0026] n N11 represents 0, 1, 2, or 3; when n N11 = 2 or 3, the rings can be the same or different, and Z N11 can be the same or different;

[0027] n N12 is 1 or 2; when n N12 = 2, the rings can be the same or different;

[0028] n N2 represents 0, 1, 2, or 3; when n N2 = 2 or 3, the rings can be the same or different, and Z N21 can be the same or different.

[0029] In the present invention, the 1-12 carbon atoms can each be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12 carbon atoms.

[0030] The alkenyl group in the present invention is preferably a group represented by any one of the formulas (V1) to (V9), particularly preferably the formula (V1), the formula (V2), the formula (V8), or (V9). The groups represented by the formulas (V1) to (V9) are shown below: Among them, "X" represents a carbon atom in the ring structure to which it is bonded.

[0031] The alkenyloxy group in the present invention is preferably a group represented by any one of the formulas (OV1) to (OV9), particularly preferably the formula (OV1), the formula (OV2), the formula (OV8), or (OV9). The groups represented by the formulas (OV1) to (OV9) are shown below:

[0032] "X" represents a carbon atom in the ring structure to which it is bonded.

[0033] When n N11 = 2, there are two rings in the compound of the general formula N-1 These two rings may have the same structure or different structures. Exemplarily, one may be and the other may be When the present invention refers to the expression "the same or different", it has the same meaning.

[0034] In the present invention, "can be independently substituted by..." means that it can be substituted or not substituted, that is, whether it is substituted or not substituted belongs to the protection scope of the present invention. The same applies to "can be independently replaced by...", and the positions of "substituted" and "replaced" can be arbitrary.

[0035] In the present invention, the short straight lines on one or both sides of the group structure represent the bonding keys and do not represent methyl groups. For example the short straight line on the left the short straight lines on both sides.

[0036] In the present invention, the halogens can all be F, Cl, Br, I, etc.; when the same description is involved below, it has the same meaning.

[0037] The following are the preferred technical solutions of the present invention, but do not limit the technical solutions provided by the present invention. Through the following preferred technical solutions, the objects and beneficial effects of the present invention can be better achieved.

[0038] In some embodiments of the present invention, the R X1 and R X2Each independently represents a straight-chain alkyl group having 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched-chain alkyl group having 3 to 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms, a straight-chain alkoxy group having 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched-chain alkoxy group having 3 to 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms, a straight-chain alkenyl group having 2 to 8 (e.g., 2, 3, 4, 5, 6, 7, or 8) carbon atoms, or a branched-chain alkenyl group having 3 to 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms.

[0039] In some embodiments of the present invention, the compounds of general formula I are selected from the group consisting of the following compounds:

[0040]

[0041] and

[0042]

[0043] wherein, R X1 and R X2 have the same defined ranges as in general formula I.

[0044] In some embodiments of the present invention, on the basis of maintaining a high clearing point, appropriate optical anisotropy, and appropriate dielectric anisotropy, in order to obtain a large elastic constant, a high contrast, and a good Flicker flicker value, the compounds of general formula I comprise at least one (e.g., two, three, four, or five) compounds of general formula I-1.

[0045] In some embodiments of the present invention, on the basis of maintaining a high clearing point, appropriate optical anisotropy, and appropriate dielectric anisotropy, in order to obtain a large elastic constant, a high contrast, and a good Flicker flicker value, the compounds of general formula I comprise at least one (e.g., two, three, four, or five) compounds selected from the group consisting of the following compounds:

[0046]

[0047] and

[0048]

[0049] wherein, R X1 and R X2Each independently represents a straight-chain alkyl group having 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms or a branched-chain alkyl group having 3 to 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms;

[0050] R X11 and R X21 Each independently represents a straight-chain alkenyl group having 2 to 8 (e.g., 2, 3, 4, 5, 6, 7, or 8) carbon atoms or a branched-chain alkenyl group having 3 to 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms;

[0051] R X12 and R X22 Each independently represents a straight-chain alkoxy group having 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms or a branched-chain alkoxy group having 3 to 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms.

[0052] In some embodiments of the present invention, it is preferred to adjust the content of the compound of general formula I such that the liquid crystal composition containing it has a larger elastic constant, a higher contrast ratio, and a better Flicker value.

[0053] In some embodiments of the present invention, the mass percentage content of the compound of general formula I in the liquid crystal composition is 0.1% - 40% (including any value or sub-range within this range), e.g., 0.1%, 1%, 2%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, or the range between any two of these values.

[0054] Preferably, the mass percentage content of the compound of general formula I in the liquid crystal composition is 0.1% - 20%.

[0055] In some embodiments of the present invention, the mass percentage content of at least one compound selected from the group consisting of compounds of general formula I-1 is 1% - 20% (including any value or sub-range within this range), e.g., 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 13%, 15%, 17%, 19%, 20%, or the range between any two of these values.

[0056] In some embodiments of the present invention, the mass percentage content of at least one compound of general formula I selected from the group consisting of compounds of general formula I-1-1, compounds of general formula I-1-2, compounds of general formula I-1-4, and compounds of general formula I-1-5 is 2% - 20% (including any value and sub-range within this range), such as 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 13%, 15%, 17%, 19%, 20%, or the range between any two of these values.

[0057] In some embodiments of the present invention, said R N1 and R N2 each independently represents a straight-chain alkyl group containing 1 - 8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched-chain alkyl group containing 3 - 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms, a straight-chain alkoxy group containing 1 - 8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched-chain alkoxy group containing 3 - 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms, a straight-chain alkenyl group containing 2 - 8 (e.g., 2, 3, 4, 5, 6, 7, or 8) carbon atoms, or a branched-chain alkenyl group containing 3 - 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms.

[0058] In some embodiments of the present invention, said Z N11 、Z N21 and Z N22 each independently represents a single bond, -CH2CH2-, -CH=CH-, -CH2O-, or -OCH2-.

[0059] In some embodiments of the present invention, said L N11 、L N12 、L N13 、L N21 and L N22 each independently represents -CH3, -CF3, -H, or a halogen.

[0060] In some embodiments of the present invention, said X N1 、X N2 each independently represents -F, -CF3, or -OCF3.

[0061] In some embodiments of the present invention, the compound of general formula N-1 is selected from the group consisting of the following compounds:

[0062]

[0063]

[0064] and

[0065]

[0066] Among them, R N1 has the same defined range as in the general formula N-1;

[0067] L N11 、L N12 、L N11 ', L N12 ', L N14 、L N15 and L N16 each independently represent -H or -F;

[0068] L N13 and L N13 ' each independently represent -H or -CH3;

[0069] X N1 represents -F, -CF3 or -OCF3;

[0070] R v and R w each independently represent -CH2- or -O-; and v and w each independently represent 0 or 1.

[0071] In some embodiments of the present invention, the compounds of the general formula N-2 are selected from the group consisting of the following compounds:

[0072]

[0073] and

[0074]

[0075] Among them, R N2 has the same defined range as in the general formula N-2;

[0076] L N21 、L N22 、L N23 、L N24 and L N25 each independently represent -H or -F;

[0077] X N2 represents -F, -CF3 or -OCF3.

[0078] In some embodiments of the present invention, on the basis of maintaining a high clearing point, appropriate optical anisotropy, and appropriate dielectric anisotropy, in order to obtain a large elastic constant, a high contrast ratio, and a good Flicker value, the N-type compound comprises at least one (e.g., two, three, four, or five) N-type compound selected from the group consisting of the compound of general formula N-1 and the compound of general formula N-2.

[0079] In some embodiments of the present invention, on the basis of maintaining a high clearing point, appropriate optical anisotropy, and appropriate dielectric anisotropy, in order to obtain a large elastic constant, a high contrast ratio, and a good Flicker value, the N-type compound comprises at least one (e.g., two, three, four, or five) N-type compound selected from the group consisting of the compound of general formula N-1-1, the compound of general formula N-1-2, the compound of general formula N-1-11, the compound of general formula N-2-1, the compound of general formula N-2-4, the compound of general formula N-2-9, and the compound of general formula N-2-10.

[0080] In some embodiments of the present invention, the compound of general formula N-1 is selected from the group consisting of the following compounds:

[0081]

[0082]

[0083] and

[0084]

[0085] wherein, R N1 has the same defined range as in the general formula N-1;

[0086] X N1 each independently represents -F, -CF3, or -OCF3.

[0087] In some embodiments of the present invention, R N1 represents a straight-chain alkyl group containing 1 to 5 carbon atoms.

[0088] In some embodiments of the present invention, X N1 represents -F.

[0089] In some embodiments of the present invention, the compound of general formula N-2 is selected from the group consisting of the following compounds:

[0090]

[0091] and

[0092]

[0093] Among them, R N2 has the same defined range as in the general formula N-2;

[0094] X N2 represents -F, -CF3 or -OCF3.

[0095] In some embodiments of the present invention, R N2 represents a straight-chain alkyl group containing 1-5 carbon atoms.

[0096] In some embodiments of the present invention, X N2 represents -F.

[0097] In some embodiments of the present invention, on the basis of maintaining a relatively high clearing point, appropriate optical anisotropy and appropriate dielectric anisotropy, in order to obtain a relatively large elastic constant, a relatively high contrast and a relatively good Flicker flicker value, the N-type compounds include at least one (for example, two, three, four or five) selected from the group consisting of compounds of general formula N-1-1C, compounds of general formula N-1-2C, compounds of general formula N-1-2D, compounds of general formula N-1-11A, compounds of general formula N-2-1A, compounds of general formula N-2-4B, compounds of general formula N-2-9A and compounds of general formula N-2-10A.

[0098] In some embodiments of the present invention, it is preferable to adjust the content of the N-type compounds such that the liquid crystal composition containing the same has a relatively large elastic constant, a relatively high contrast and a relatively good Flicker flicker value.

[0099] In some embodiments of the present invention, the mass percentage content of the N-type compounds in the liquid crystal composition is 0.1%-40% (including any value or sub-range within this range), for example, 0.1%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, or the range between any two of these values.

[0100] Preferably, the mass percentage content of the N-type compounds in the liquid crystal composition is 0.1%-25%.

[0101] In some embodiments of the present invention, the mass percentage content of at least one N-type compound selected from the group consisting of compounds of general formula N-1 and compounds of general formula N-2 is 0.1% - 30% (including any value or sub-range within this range), for example, 0.1%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 13%, 15%, 17%, 19%, 20%, 22%, 24%, 26%, 28%, 30%, or the range between any two of these values.

[0102] In some embodiments of the present invention, the mass percentage content of at least one N-type compound selected from the group consisting of compounds of general formula N-1-1, compounds of general formula N-1-2, compounds of general formula N-1-11, compounds of general formula N-2-1, compounds of general formula N-2-4, compounds of general formula N-2-9, and compounds of general formula N-2-10 is 1% - 30% (including any value or sub-range within this range), for example, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 13%, 15%, 17%, 19%, 20%, 22%, 24%, 25%, 26%, 28%, 30%, or the range between any two of these values.

[0103] In some embodiments of the present invention, the mass percentage content of at least one N-type compound selected from the group consisting of compounds of general formula N-1-1C, compounds of general formula N-1-2C, compounds of general formula N-1-2D, compounds of general formula N-1-11A, compounds of general formula N-2-1A, compounds of general formula N-2-4B, compounds of general formula N-2-9A, and compounds of general formula N-2-10A is 1% - 25% (including any value or sub-range within this range), for example, 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 the range between any two of these values.

[0104] In some embodiments of the present invention, the liquid crystal composition further comprises at least one compound of general formula M:

[0105]

[0106] wherein, R M1 and R M2 each independently represents a straight-chain or branched-chain alkyl group containing 1 - 12 (for example, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, One or more non-adjacent -CH2- in the straight-chain or branched-chain alkyl group having 1 to 12 carbon atoms may be independently replaced by -CH═CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO- respectively;

[0107] ring ring ring each independently represents the One or more -CH2- therein may be replaced by -O-, and one or at most two single bonds in the rings may be replaced by double bonds; the At most one -H therein may be substituted by a halogen;

[0108] Z M1 and Z M2 each independently represents a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH═CH-, -C≡C-, -CF2CF2-, -CF2O-, -OCF2-, -CH2CH2- or -(CH2)4-;

[0109] n M represents 0, 1, 2 or 3; when n M = 2 or 3, the rings are the same or different, and Z M2 are the same or different; when n M = 0, the ring and the ring are not

[0110] In some embodiments of the present invention, the R M1 and R M2 each independently represents a straight-chain alkyl group having 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms, a branched-chain alkyl group having 3 to 8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms, a straight-chain alkoxy group having 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms, a branched-chain alkoxy group having 3 to 8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms, a straight-chain alkenyl group having 2 to 8 (e.g., 2, 3, 4, 5, 6, 7 or 8) carbon atoms, a branched-chain alkenyl group having 3 to 10 (e.g., 3, 4, 5, 6, 7, 8, 9 or 10) carbon atoms,

[0111] In some embodiments of the present invention, the R M1 and R M2Either of them is a straight-chain alkoxy group having 1 to 8 carbon atoms, a straight-chain alkenyl group having 2 to 8 carbon atoms, a branched-chain alkenyl group having 3 to carbon atoms, or a branched-chain alkoxy group having 3 to 8 carbon atoms, and the other is a straight-chain alkyl group having 1 to 8 carbon atoms or a branched-chain alkyl group having 3 to 8 carbon atoms.

[0112] In some embodiments of the present invention, the compound of formula M is selected from the group consisting of the following compounds:

[0113]

[0114]

[0115]

[0116]

[0117]

[0118] And

[0119]

[0120] Wherein, the R M1 And R M2 Have the same defined ranges as in formula M.

[0121] In some embodiments of the present invention, on the basis of maintaining a relatively high clearing point, appropriate optical anisotropy and appropriate dielectric anisotropy, in order to obtain a relatively large elastic constant, a relatively high contrast and a relatively good Flicker value, the compound of formula M comprises at least one (for example, two, three, four or five) selected from the group consisting of the compounds of formula M-1, the compounds of formula M-10, the compounds of formula M-18, the compounds of formula M-26, the compounds of formula M-34, the compounds of formula M-44, the compounds of formula M-46 and the compounds of formula M-47.

[0122] In some embodiments of the present invention, on the basis of maintaining a relatively high clearing point, appropriate optical anisotropy and appropriate dielectric anisotropy, in order to obtain a relatively large elastic constant, a relatively high contrast and a relatively good Flicker value, the compound of formula M comprises at least one (for example, two, three, four or five) selected from the group consisting of the following compounds:

[0123]

[0124]

[0125]

[0126] Among them, R M1 and R M2 each independently represents a straight-chain alkyl group having 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms or a branched-chain alkyl group having 3 to 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms;

[0127] R M11 and R M21 each independently represents a straight-chain alkenyl group having 2 to 8 (e.g., 2, 3, 4, 5, 6, 7, or 8) carbon atoms or a branched-chain alkenyl group having 3 to 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms;

[0128] R M22 represents a straight-chain alkoxy group having 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms or a branched-chain alkoxy group having 3 to 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms.

[0129] In some embodiments of the present invention, it is preferred to adjust the content of the compound of general formula M such that the liquid crystal composition containing it has a relatively large elastic constant, a relatively high contrast, and a relatively good Flicker value.

[0130] In some embodiments of the present invention, the mass percentage content of the compound of general formula M in the liquid crystal composition is 0.1% - 90% (including any value or sub-range within this range), for example, 0.1%, 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%, 80%, 82%, 84%, 86%, 88%, 90%, or the range between any two of these values.

[0131] Preferably, the mass percentage content of the compound of general formula M in the liquid crystal composition is 30% - 80%.

[0132] In some embodiments of the present invention, the mass percentage content of at least one compound of general formula M selected from the group consisting of compounds of general formula M-1, compounds of general formula M-10, compounds of general formula M-18, compounds of general formula M-26, compounds of general formula M-34, compounds of general formula M-44, compounds of general formula M-46, and compounds of general formula M-47 is 1% - 80% (including any value or sub-range within this range), 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%, 80%, or the range between any two of these values.

[0133] In some embodiments of the present invention, the mass percentage content of at least one compound of general formula M selected from the group consisting of compounds of general formula M-1-1, compounds of M-1-3, compounds of general formula M-10-2, compounds of general formula M-18-1, compounds of general formula M-18-3, compounds of general formula M-26-1, compounds of general formula M-26-2, compounds of general formula M-26-3, compounds of general formula M-34-2, compounds of general formula M-44-1, compounds of general formula M-46-1, and compounds of general formula M-47-1 is 30% - 80% (including any value and sub-range within this range), for example, 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%, 80%, or the range between any two of these values.

[0134] In some embodiments of the present invention, the liquid crystal composition further comprises at least one type A compound, and the type A compound is selected from the group consisting of compounds of general formula A-1 and compounds of general formula A-2:

[0135] and

[0136]

[0137] wherein, R A1 、R A2 each independently represents -H, a straight-chain or branched-chain alkyl group containing 1 - 12 (for example, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, One or more non-adjacent -CH2- in the straight-chain or branched-chain alkyl group having 1 to 12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO- respectively; one or more -H in the foregoing groups may be independently replaced by -F or -Cl;

[0138] Ring Ring Ring and Ring each independently represents The One or more -CH2- in may be replaced by -O-; the One or more single bonds in the ring in may be replaced by double bonds; the One or more -CH= in the ring in may be replaced by -N=; one or more -H in the foregoing groups may be independently replaced by -F, -Cl or -CN;

[0139] Z A11 、Z A21 and Z A22 each independently represents a single bond, -CH2CH2-, -CF2CF2-, -CO-O-, -O-CO-, -O-CO-O-, -CH=CH-, -CF=CF-, -CH2O- or -OCH2-;

[0140] L A11 、L A12 、L A13 、L A21 and L A22 each independently represents -H, a halogen or an unsubstituted or halogenated straight-chain alkyl group having 1 to 3 (e.g., 1, 2 or 3) carbon atoms;

[0141] X A1 and X A2 each independently represents a halogen, a halogenated alkyl group having 1 to 5 (e.g., 1, 2, 3, 4 or 5) carbon atoms, a halogenated alkoxy group having 1 to 5 (e.g., 1, 2, 3, 4 or 5) carbon atoms, a halogenated alkenyl group having 2 to 5 (e.g., 2, 3, 4 or 5) carbon atoms or a halogenated alkenyloxy group having 2 to 5 (e.g., 2, 3, 4 or 5) carbon atoms;

[0142] n A11 represents 0, 1, 2 or 3; when n A11 = 2 or 3, the rings may be the same or different, and Z A11 may be the same or different;

[0143] nA12 is 1 or 2; when n A12 = 2, the ring can be the same or different;

[0144] n A2 represents 0, 1, 2 or 3; when n A2 = 2 or 3, the ring can be the same or different, and Z A21 can be the same or different.

[0145] In some embodiments of the present invention, the compound of formula A-1 is selected from the group consisting of the following compounds:

[0146]

[0147]

[0148] and

[0149] wherein, R A1 has the same defined range as in formula A-1;

[0150] L A11 、L A12 、L A14 、L A15 and L A16 each independently represents -H or -F;

[0151] L A13 represents -H or -CH3;

[0152] X A1 represents -F, -CF3 or -OCF3.

[0153] In some embodiments of the present invention, the compound of formula A-2 is selected from the group consisting of the following compounds:

[0154]

[0155]

[0156]

[0157] and

[0158]

[0159] wherein, R A2 has the same defined range as in formula N-2;

[0160] L A21 、L A22 、L A23 、L A24 and L A25 each independently represents -H or -F;

[0161] X A2 represents -F, -CF3, -OCF3 or -CH2CH2CH=CF2.

[0162] In some embodiments of the present invention, on the basis of maintaining a relatively high clearing point, appropriate optical anisotropy, and appropriate dielectric anisotropy, in order to obtain a relatively large elastic constant, a relatively high contrast, and a relatively good Flicker value, the Class A compound comprises at least one (e.g., two, three, four, or five) Class A compound selected from the group consisting of compounds of General Formula A-1 and compounds of General Formula A-2.

[0163] In some embodiments of the present invention, on the basis of maintaining a relatively high clearing point, appropriate optical anisotropy, and appropriate dielectric anisotropy, in order to obtain a relatively large elastic constant, a relatively high contrast, and a relatively good Flicker value, the Class A compound comprises at least one (e.g., two, three, four, or five) Class A compound selected from the group consisting of compounds of General Formula A-1-5, compounds of General Formula A-1-10, compounds of General Formula A-1-12, compounds of General Formula A-2-5, compounds of General Formula A-2-6, compounds of General Formula A-2-14, and compounds of General Formula A-2-15.

[0164] In some embodiments of the present invention, on the basis of maintaining a relatively high clearing point, appropriate optical anisotropy, and appropriate dielectric anisotropy, in order to obtain a relatively large elastic constant, a relatively high contrast, and a relatively good Flicker value, the compound of General Formula A-1 comprises at least one (e.g., two, three, four, or five) compound of General Formula A-1 selected from the group consisting of the following compounds:

[0165]

[0166] and

[0167]

[0168] wherein, R A1 represents a straight-chain alkyl group containing 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms or a branched-chain alkyl group containing 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms;

[0169] XA1 represents -F, -CF3 or -OCF3.

[0170] In some embodiments of the present invention, R A1 represents a straight-chain alkyl group having 1 to 5 carbon atoms.

[0171] In some embodiments of the present invention, on the basis of maintaining a high clearing point, appropriate optical anisotropy and appropriate dielectric anisotropy, in order to obtain a large elastic constant, a high contrast and a good Flicker flicker value, the compound of general formula A-2 comprises at least one (e.g., two, three, four or five) compound of general formula A-2 selected from the group consisting of the following compounds:

[0172]

[0173]

[0174] and

[0175]

[0176] wherein, R A2 represents a straight-chain alkyl group having 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms or a branched-chain alkyl group having 3 to 8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms;

[0177] X A2 represents -F, -CF3, -OCF3 or -CH2CH2CH=CF2.

[0178] In some embodiments of the present invention, R A2 represents a straight-chain alkyl group having 1 to 5 carbon atoms.

[0179] In some embodiments of the present invention, on the basis of maintaining a high clearing point, appropriate optical anisotropy and appropriate dielectric anisotropy, in order to obtain a large elastic constant, a high contrast and a good Flicker flicker value, the class A compound comprises at least one (e.g., two, three, four or five) class A compound selected from the group consisting of the compound of general formula A-1-5-1, the compound of general formula A-1-10-1, the compound of general formula A-1-12-1, the compound of general formula A-2-5-1, the compound of general formula A-2-6-1, the compound of general formula A-2-14-1, the compound of general formula A-2-14-2, the compound of general formula A-2-15-1 and the compound of general formula A-2-15-2.

[0180] In some embodiments of the present invention, the mass percentage content of the compound of type A in the liquid crystal composition is 0.1% - 60% (including any value or sub-range within this range), for example, 0.1%, 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%, or the range between any two of these values.

[0181] Preferably, the mass percentage content of the compound of type A in the liquid crystal composition is 0.1% - 30%.

[0182] In some embodiments of the present invention, the mass percentage content of at least one type A compound selected from the group consisting of the compound of general formula A-1 and the compound of general formula A-2 is 0.1% - 40% (including any value or sub-range within this range), for example, 0.1%, 1%, 2%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, or the range between any two of these values.

[0183] In some embodiments of the present invention, the mass percentage content of at least one type A compound selected from the group consisting of the compound of general formula A-1-5, the compound of general formula A-1-10, the compound of general formula A-1-12, the compound of general formula A-2-5, the compound of general formula A-2-6, the compound of general formula A-2-14, and the compound of general formula A-2-15 is 0.1% - 30% (including any value or sub-range within this range), for example, 0.1%, 1%, 2%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, or the range between any two of these values.

[0184] In some embodiments of the present invention, the mass percentage content of at least one class A compound selected from the group consisting of compounds of general formula A-1-5-1, compounds of general formula A-1-10-1, compounds of general formula A-1-12-1, compounds of general formula A-2-5-1, compounds of general formula A-2-6-1, compounds of general formula A-2-14-1, compounds of general formula A-2-14-2, compounds of general formula A-2-15-1, and compounds of general formula A-2-15-2 is 1% - 30% (including any value or sub-range within this range), for example, 1%, 2%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, or the range between any two of these values.

[0185] In addition to the above compounds, the liquid crystal composition of the present invention may also contain any one or a combination of at least two of common nematic liquid crystals, smectic liquid crystals, cholesteric liquid crystals, polymerizable monomers, or additives.

[0186] In a preferred technical solution, the liquid crystal composition further includes at least one additive.

[0187] In some embodiments of the present invention, the mass percentage content of the additive in the liquid crystal composition is 0.01 - 5%; preferably, the mass percentage content of the additive in the liquid crystal composition is 0.01% - 1%.

[0188] In a preferred technical solution, the additive includes any one or a combination of at least two of a dopant, an antioxidant, an ultraviolet absorber, an infrared absorber, or a light stabilizer.

[0189] The following shows possible dopants preferably added to the liquid crystal composition of the present invention:

[0190]

[0191]

[0192] Among them, * represents a chiral site.

[0193] In addition, additives such as antioxidants and light stabilizers used in the liquid crystal composition of the present invention are preferably the following substances:

[0194]

[0195]

[0196]

[0197]

[0198] Among them, n represents an integer from 1 to 12.

[0199] In a second aspect, the present invention provides a liquid crystal display device, and the liquid crystal display device includes the liquid crystal composition as described in the first aspect.

[0200] In a third aspect, the present invention provides an application of the foregoing liquid crystal composition in a liquid crystal display device, and the foregoing liquid crystal composition is particularly suitable for a high-contrast and fast-response IPS liquid crystal display mode.

[0201] Compared with the prior art, the present invention has the following beneficial effects:

[0202] On the basis of maintaining a relatively high clearing point, appropriate optical anisotropy, and appropriate dielectric anisotropy, the liquid crystal composition provided by the present invention has a relatively large elastic constant, a relatively high contrast ratio, and a relatively good Flicker value, which helps to improve the display effect of the liquid crystal material, so that the liquid crystal display device containing it has a relatively small threshold voltage and a relatively wide temperature range of use, and can be widely applied to a high-contrast and fast-response IPS liquid crystal display mode. Detailed implementation manners

[0203] To facilitate the understanding of the present invention, the following examples are listed. Those skilled in the art should understand that the examples are only for helping to understand the present invention and should not be regarded as specific limitations on the present invention.

[0204] For the convenience of expression, in the following examples and comparative examples, the group structures of each compound are represented by the codes listed in Table 1:

[0205] Table 1

[0206]

[0207]

[0208] Taking the compound with 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. In the code, n represents the number of C atoms of the alkyl group at the left end. For example, when n is "3", it means that the alkyl group is -C3H7; C in the code represents 1,4-cyclohexylene, G represents 2-fluoro-1,4-phenylene, and F represents fluorine.

[0209] The abbreviated codes of the test items in the following examples and comparative examples are as follows:

[0210] Cp Clearing point (transition temperature from nematic phase to isotropic phase, °C)

[0211] Δn Optical anisotropy (589 nm, 25 °C)

[0212] n o Refractive index of ordinary light

[0213] n e Refractive index of extraordinary light

[0214] Δε Dielectric anisotropy (1KHz, 25°C)

[0215] K ave Average elastic constant (20°C)

[0216] K 11 Splay elastic constant (25°C)

[0217] K 22 Twist elastic constant (25°C)

[0218] K 33 Bend elastic constant (25°C)

[0219] CR Contrast ratio (25°C)

[0220] Flicker Flicker value (dB)

[0221] (1) Cp: Obtained by testing with a melting point instrument;

[0222] (2) Δn: Δn = n e - n0, measured at 25°C under a sodium lamp (589nm) light source using an Abbe refractometer;

[0223] (3) Δε: Δε = ε ∥ - ε ⊥ , where ε ∥ is the dielectric constant parallel to the molecular axis, and ε ⊥ is the dielectric constant perpendicular to the molecular axis; Test conditions: 25°C, 1KHz, TN type test cell with a cell thickness of 7μm;

[0224] (4) Flicker value: Measured using a DMS 505 tester in Flicker mode and taking the logarithm of the measured value; Test conditions: 25°C, 40Hz, driven by V22 voltage, FFS type test cell with a cell thickness of 3μm;

[0225] (5) K ave : K ave = (K 11 + K 22 + K 33 ), where K 11 、K 22 and K 33It is obtained by using an LCR meter and an antiparallel rubbing cell to test the capacitance-voltage characteristic curve (C-V curve) of the liquid crystal material and performing calculations. Test conditions: Antiparallel rubbing cell with a cell thickness of 7 μm, V = 0.1 - 20 V;

[0226] (6) CR: Use a DMS 505 tester to measure the transmittance of the liquid crystal cell at 255 gray-scale voltages and 0 gray-scale voltage, namely T r255 and T r0 , and CR is obtained from T r255 / T r0 ; Test conditions: Positive FFS type test cell at 25 °C with a cell thickness of 3 μm;

[0227] The compounds used in the following examples can all be synthesized by known methods or obtained through commercial channels. These synthetic techniques are conventional, and the obtained liquid crystal compositions meet the standards for electronic compounds after testing.

[0228] Prepare the liquid crystal composition according to the ratio of each liquid crystal composition in the following examples and comparative examples. The preparation of the liquid crystal composition is carried out according to the conventional methods in the art, such as by heating, ultrasonic waves, suspension, etc. and mixing in accordance with the specified ratio.

[0229] Example 1

[0230] A liquid crystal composition contains components with the mass percentages shown in the following table, and it is filled between two substrates of a liquid crystal display for performance testing:

[0231]

[0232]

[0233] Example 2

[0234] A liquid crystal composition contains components with the mass percentages shown in the following table, and it is filled between two substrates of a liquid crystal display for performance testing:

[0235]

[0236] Comparative Example 1

[0237] A liquid crystal composition contains components with the mass percentages shown in the following table, and it is filled between two substrates of a liquid crystal display for performance testing:

[0238]

[0239]

[0240] According to the comparison between Example 2 and Comparative Example 1, by optimizing the structures and contents of the compounds of General Formula I and Class N compounds, the liquid crystal composition of the present invention has a large elastic constant (K ave : 13.1 VS 12.3), a higher contrast ratio (1500 VS 1320), and a better Flicker value (-43.56 VS -38.56) while maintaining a relatively high clearing point (81.2 VS 81.2), an appropriate optical anisotropy (0.115 VS 0.114), and an appropriate dielectric anisotropy (8.4 VS 7.9).

[0241] Example 3

[0242] A liquid crystal composition comprising the components in the mass percentages shown in the following table, and filling it between two substrates of a liquid crystal display for performance testing:

[0243]

[0244] Example 4

[0245] A liquid crystal composition comprising the components in the mass percentages shown in the following table, and filling it between two substrates of a liquid crystal display for performance testing:

[0246]

[0247]

[0248] Example 5

[0249] A liquid crystal composition comprising the components in the mass percentages shown in the following table, and filling it between two substrates of a liquid crystal display for performance testing:

[0250]

[0251] Example 6

[0252] A liquid crystal composition comprising the components in the mass percentages shown in the following table, and filling it between two substrates of a liquid crystal display for performance testing:

[0253]

[0254]

[0255] Example 7

[0256] A liquid crystal composition comprising the components in the mass percentages shown in the following table, and filling it between two substrates of a liquid crystal display for performance testing:

[0257]

[0258] Example 8

[0259] A liquid crystal composition comprising components in the mass percentages shown in the following table, and filled between two substrates of a liquid crystal display for performance testing:

[0260]

[0261] It can be seen from the comparison between the examples and comparative examples of the present invention that by compounding the compound containing a cyclohexene structure (compound of general formula I) and N-type compounds, the liquid crystal composition has a large elastic constant (13.1 - 17.2), a high contrast ratio (1500 - 2150), and a good Flicker flicker value (-43.56 - -53.51) while maintaining a relatively high clearing point (81.2 - 105.5), an appropriate optical anisotropy (0.0976 - 0.115), and an appropriate dielectric anisotropy (2.7 - 8.4). This helps to improve the display effect of the liquid crystal material, making the liquid crystal display device containing it have a small threshold voltage and a wide temperature range of use, and can be widely applied to the high-contrast and fast-response IPS liquid crystal display mode.

[0262] The applicant declares that the present invention uses the above examples to illustrate the detailed process equipment and process flow of the present invention, but the present invention is not limited to the above detailed process equipment and process flow, that is, it does not mean that the present invention must rely on the above detailed process equipment and process flow to be implemented. Those skilled in the art should understand that any improvement to the present invention, the equivalent substitution of each raw material of the product of the present invention, the addition of auxiliary components, and the selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A liquid crystal composition, characterized in that, The liquid crystal composition comprises: at least one compound of general formula I: and at least one type N compound selected from the group consisting of a compound of general formula N-1 and a compound of general formula N-2: Wherein, R X1 and R X2 each independently represents a straight-chain or branched-chain alkyl group having 1 to 12 carbon atoms, one or more non-adjacent -CH2- in the straight-chain or branched-chain alkyl group having 1 to 12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-; Ring and ring each independently represents and ring ring at least one of which represents R N1 and R N2 each independently represents -H, a linear or branched alkyl group having 1 to 12 carbon atoms, one or more non-adjacent -CH2- in the linear or branched alkyl group having 1 to 12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-; one or more -H in the foregoing groups may be independently replaced by -F or -Cl; Ring Ring Ring and Ring each independently represents the one or more -CH2- in the above can be replaced by -O-, and the single bond in one or more rings can be replaced by a double bond; the -CH= in one or more rings in the above can be replaced by -N=; one or more -H in the foregoing groups can be independently replaced by -F, -Cl or -CN respectively; Among them, the compound of general formula N-1 contains at least one The compound of general formula N-2 comprises at least one Z N11 , Z N21 and Z N22 each independently represents a single bond, -CH2CH2-, -CF2CF2-, -CO-O-, -O-CO-, -O-CO-O-, -CH=CH-, -CF=CF-, -CH2O- or -OCH2-; L N11 、L N12 、L N13 、L N21 and L N22 each independently represents -H, a halogen, or an unsubstituted or halogenated straight-chain alkyl group having 1 to 3 carbon atoms; X N1 and X N2 each independently represents a halogen, a haloalkyl group having 1 to 5 carbon atoms, a haloalkoxy group having 1 to 5 carbon atoms, a haloalkenyl group having 2 to 5 carbon atoms, or a haloalkenyloxy group having 2 to 5 carbon atoms; n N11 represents 0, 1, 2 or 3; when n N11 = 2 or 3, the rings may be the same or different, and Z N11 may be the same or different; n N12 is 1 or 2; n N12 When = 2, the ring can be the same or different; n N2 represents 0, 1, 2 or 3; when n N2 = 2 or 3, the rings may be the same or different, and Z N21 may be the same or different.

2. The liquid crystal composition according to claim 1, wherein The compound of general formula I is selected from the group consisting of the following compounds: and wherein, R X1 and R X2 have the same defined ranges as those in the general formula I.

3. The liquid crystal composition according to claim 1, characterized in that, The compound of general formula N-1 is selected from the group consisting of the following compounds: and wherein, R N1 has the same defined range as in the general formula N-1; L N11 、L N12 、L N11 '、L N12 '、L N14 、L N15 and L N16 each independently represents -H or -F; L N13 and L N13 each independently represents -H or -CH3; X N1 each independently represents -F, -CF3 or -OCF3; R v and R w each independently represents -CH2- or -O-; and v and w each independently represent 0 or 1.

4. The liquid crystal composition according to claim 1, wherein The compound of general formula N-2 is selected from the group consisting of the following compounds: and wherein, R N2 has the same defined scope as in the general formula N-2; L N21 、L N22 、L N23 、L N24 and L N25 each independently represents -H or -F; X N2 represents -F, -CF3 or -OCF3.

5. The liquid crystal composition according to claim 1, characterized in that, The mass percentage content of the compound of general formula I in the liquid crystal composition is 0.1%-40%; the mass percentage content of the type N compound in the liquid crystal composition is 0.1%-40%.

6. The liquid crystal composition according to claim 1, characterized in that, The liquid crystal composition further comprises at least one compound of general formula M: Wherein, R M1 and R M2 each independently represents a straight-chain or branched-chain alkyl group having 1 to 12 carbon atoms, one or more non-adjacent -CH2- in the straight-chain or branched-chain alkyl group having 1 to 12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-; Ring Ring Ring Each independently represents The One or more of the -CH2- in can be replaced by -O-, and the single bond in one or at most two rings can be replaced by a double bond; the At most one -H in can be replaced by a halogen; Z M1 and Z M2 each independently represents a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH═CH-, -C≡C-, -CF2CF2-, -CF2O-, -OCF2-, -CH2CH2- or -(CH2)4-; n M represents 0, 1, 2 or 3; when n M = 2 or 3, the rings are the same or different, Z M2 are the same or different; when n M = 0, the ring and the ring are not Preferably, the mass percentage content of the compound of general formula M in the liquid crystal composition is 0.1%-90%.

7. The liquid crystal composition according to claim 1, wherein The liquid crystal composition further comprises at least one type A compound selected from the group consisting of a compound of general formula A-1 and a compound of general formula A-2: and Wherein, R A1 and R A2 each independently represents -H, a straight-chain or branched-chain alkyl group having 1 to 12 carbon atoms, one or more non-adjacent -CH2- in the straight-chain or branched-chain alkyl group having 1 to 12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-; one or more -H in the foregoing groups may be independently replaced by -F or -Cl; Ring Ring Ring and Ring each independently represents the one or more -CH2- in the above can be replaced by -O-; the single bond in one or more rings in the above can be replaced by a double bond; the -CH= in one or more rings in the above can be replaced by -N=; one or more -H in the foregoing groups can be independently replaced by -F, -Cl or -CN respectively; Z A11 , Z A21 and Z A22 each independently represents a single bond, -CH2CH2-, -CF2CF2-, -CO-O-, -O-CO-, -O-CO-O-, -CH=CH-, -CF=CF-, -CH2O- or -OCH2-; L A11 、L A12 、L A13 、L A21 and L A22 each independently represents -H, a halogen, or an unsubstituted or halogenated straight-chain alkyl group having 1 to 3 carbon atoms; X A1 and X A2 each independently represents a halogen, a haloalkyl having 1 to 5 carbon atoms, a haloalkoxy having 1 to 5 carbon atoms, a haloalkenyl having 2 to 5 carbon atoms or a haloalkenyloxy having 2 to 5 carbon atoms; n A11 represents 0, 1, 2, or 3; when n A11 = 2 or 3, the rings can be the same or different, and Z A11 can be the same or different; n A12 is 1 or 2; when n A12 = 2, the rings can be the same or different; n A2 represents 0, 1, 2 or 3; when n A2 = 2 or 3, the rings may be the same or different, and Z A21 may be the same or different; Preferably, the mass percentage content of the type A compound in the liquid crystal composition is 0.1%-60%.

8. The liquid crystal composition according to claim 7, wherein The compound of general formula A-1 is selected from the group consisting of the following compounds: and Wherein, R A1 has the same defined range as in the general formula A-1; L A11 , L A12 , L A14 , L A15 and L A16 each independently represents -H or -F; L A13 represents -H or -CH3; X A1 represents -F, -CF3 or -OCF3; Preferably, the compound of general formula A-2 is selected from the group consisting of the following compounds: and wherein, R A2 has the same defined range as in the general formula N-2; L A21 、L A22 、L A23 、L A24 and L A25 each independently represents -H or -F; X A2 represents -F, -CF3, -OCF3 or -CH2CH2CH=CF2.

9. A liquid crystal display device, characterized in that, The liquid crystal display device comprises the liquid crystal composition according to any one of claims 1-8.

10. An application of the liquid crystal display device as described in claim 9, characterized in that, Use of the liquid crystal display device in an IPS liquid crystal display mode.

Images