Liquid crystal composition, liquid crystal display element and liquid crystal display

Abstract

The invention belongs to the technical field of liquid crystal materials, and particularly relates to a liquid crystal composition and a liquid crystal display element or a liquid crystal display containing the liquid crystal composition. The invention discloses a liquid crystal composition which comprises one or more compounds as shown in a formula I and one or more compounds as shown in a formula II. The liquid crystal composition disclosed by the invention has good low-temperature performance, relatively small rotary viscosity gamma 1 and relatively large elastic constant K, can be used for developing a liquid crystal display element or a liquid crystal display with high contrast and quick response, and is particularly suitable for a Gaming MNT / NB type liquid crystal display element or a liquid crystal display with quick response. # imgabs0 #

Description

Technical Field

[0001] The present invention relates to a liquid crystal composition and a liquid crystal display element or a liquid crystal display using the same, and is mainly applicable to the field of liquid crystal display technology. Background Art

[0002] As an important flat panel display device, liquid crystal display is widely used in high-end display devices due to its low power consumption, light weight, easy driving and high resolution. Related products such as mobile phone screens, notebooks, computer screens, LCD TVs, etc. have been extensively researched and developed and successfully introduced into mass production. After years of development, liquid crystal displays have developed a variety of display modes, such as TN, IPS, FFS and VA. Among them, the FFS display mode is the most widely used due to its advantages of high resolution, high transmittance, low power consumption, wide viewing angle, high aperture ratio, low color difference, and no squeezed water ripples. However, compared with other display modes (such as VA), there is a problem of low contrast ratio (CR).

[0003] In recent years, with the rapid development of e-sports competitions and becoming a national official sport, gaming display (Gaming) has gradually become an important development branch of display devices. Gaming monitors focus on displaying game screens, which are characterized by bright and complex colors, rich elements, many motion pictures, and fast motion speeds. For gaming monitors, the biggest feature is fast response. Currently, the response speeds of common gaming MNT / NB products on the market are 5ms and 3ms, and high-end LCD products can achieve 1ms.

[0004] For liquid crystal materials, the response speed of liquid crystal materials in the prior art is limited by the rotational viscosity γ of the liquid crystal. 1 / elastic constant K, therefore, the development of liquid crystals with fast response speed requires reducing the rotational viscosity γ of the liquid crystal medium 1 , while increasing the elastic constant K.

[0005] As the response speed continues to increase, the monitor response speed has reached a relatively high level for the human eye. Therefore, the pursuit of improved response speed for gaming products has slowed down, and the focus has shifted to improving LCD image quality.

[0006] Contrast ratio (CR for short, which refers to the ratio of the brightness of a point on the screen when it is brightest to the brightness when it is darkest) is highly correlated with image quality. The higher the contrast ratio, the clearer the image quality, the brighter the colors displayed by the display, and the richer the sense of hierarchy. Currently, the contrast ratio of common positive gaming LCD displays is generally 800:1 to 1000:1, and device manufacturers are working to increase the display CR to 1500:1 to 2000:1 while maintaining the current response speed.

[0007] CR=Tr 亮 / Tr 暗

[0008] T 暗 ∝1 / S LC ; S LC ={(n e +n o ) 2 *△n 2} / K ave ; K ave =(K 11 +K 22 +K 33 ) / 3

[0009] From the definition of contrast, we can know that there are two main ways to improve contrast: on the one hand, it is to increase the brightness of the display in the bright state, and on the other hand, it is to reduce the brightness in the dark state, that is, to make the bright state brighter and the dark state darker. However, in the conventional research and development process, most of them will not improve the contrast by improving the brightness of the bright state, because the main factor affecting the brightness of the bright state is the transmittance, and the main factor affecting the transmittance is the phase delay △nd of the liquid crystal box. The larger the △nd, the greater the transmittance, but because other factors such as color deviation and viewing angle need to be considered, the variable range of △nd is small, and the contribution to improving the contrast is limited. Therefore, reducing the brightness of the dark state is the main direction of improvement to improve the contrast. Affected by the arrangement state of the liquid crystal, the liquid crystal display will have a certain degree of light leakage in the dark state, that is, the brightness of the dark state cannot reach absolute black, and a slight change in the brightness of the dark state will have a greater impact on the contrast. Therefore, at present, the contrast is mainly improved by reducing the brightness in the dark state. To reduce the contrast in the dark state, it is necessary to start with the elastic constant of the liquid crystal composition. The increase in the elastic constant is conducive to reducing the brightness of the dark state.

[0010] Therefore, for the development of high contrast and fast response liquid crystal materials, it is necessary to improve the high elastic constant K of liquid crystal materials and reduce the rotational viscosity γ 1 , which is a technical problem that needs to be solved urgently. Summary of the invention

[0011] The technical solution provided by the present invention can solve one or more of the above technical problems. The liquid crystal composition of the present invention has good low temperature performance and a small rotational viscosity γ 1 and a large elastic constant K, which can be used to develop high-contrast and fast-response liquid crystal display elements or liquid crystal displays.

[0012] The liquid crystal composition provided by the present invention comprises one or more compounds represented by formula I and one or more compounds represented by formula II.

[0013]

[0014] in,

[0015] R 1 represents an alkenyl group having 2 to 10 carbon atoms or a fluorine-substituted alkenyl group having 2 to 10 carbon atoms;

[0016] R 2 represents F, an alkyl group having 1 to 10 carbon atoms, an alkyl group having 1 to 10 carbon atoms substituted with fluorine, an alkoxy group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms substituted with fluorine, an alkenyl group having 2 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms substituted with fluorine, an alkenyloxy group having 3 to 10 carbon atoms, or an alkenyloxy group having 3 to 10 carbon atoms substituted with fluorine;

[0017] R 3 represents F, an alkyl group having 1 to 10 carbon atoms, an alkyl group having 1 to 10 carbon atoms substituted with fluorine, an alkoxy group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms substituted with fluorine, an alkenyl group having 2 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms substituted with fluorine, or an alkenyloxy group having 3 to 10 carbon atoms substituted with fluorine.

[0018] The second object of the present invention is to provide a liquid crystal display element, which comprises the aforementioned liquid crystal composition, and the liquid crystal display element is an active matrix addressing display element or a passive matrix addressing display element.

[0019] The third object of the present invention is to provide a liquid crystal display, which comprises the liquid crystal composition, and the liquid crystal display is an active matrix addressing display or a passive matrix addressing display.

[0020] Effects of the Invention

[0021] The liquid crystal composition of the present invention has good low temperature performance and a small rotational viscosity γ 1and a larger elastic constant K, can be used to develop high-contrast and fast-response liquid crystal display elements or liquid crystal displays. The liquid crystal composition of the present invention is particularly suitable for Gaming MNT / NB type fast-response liquid crystal display elements or liquid crystal displays. DETAILED DESCRIPTION

[0022] The liquid crystal composition provided by the present invention comprises one or more compounds represented by formula I and one or more compounds represented by formula II.

[0023]

[0024] in,

[0025] R 1 represents an alkenyl group having 2 to 10 carbon atoms or a fluorine-substituted alkenyl group having 2 to 10 carbon atoms;

[0026] R 2 represents F, an alkyl group having 1 to 10 carbon atoms, an alkyl group having 1 to 10 carbon atoms substituted with fluorine, an alkoxy group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms substituted with fluorine, an alkenyl group having 2 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms substituted with fluorine, an alkenyloxy group having 3 to 10 carbon atoms, or an alkenyloxy group having 3 to 10 carbon atoms substituted with fluorine;

[0027] R 3 represents F, an alkyl group having 1 to 10 carbon atoms, an alkyl group having 1 to 10 carbon atoms substituted with fluorine, an alkoxy group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms substituted with fluorine, an alkenyl group having 2 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms substituted with fluorine, or an alkenyloxy group having 3 to 10 carbon atoms substituted with fluorine.

[0028] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula I is selected from the group consisting of the compounds represented by the following formulas I-1 to I-7,

[0029]

[0030] In the liquid crystal composition of the present invention, it is further preferred that the compound represented by the aforementioned formula I is selected from the compounds represented by formulas I-3 to I-5.

[0031] In the liquid crystal composition of the present invention, it is further preferred that the compound represented by the aforementioned formula I contains the compound represented by formula I-3, with a mass content of 1-15%, and more preferably a mass content of 4-10%.

[0032] In the liquid crystal composition of the present invention, it is further preferred that the compound represented by the aforementioned formula I contains the compound represented by formula I-4, with a mass content of 1-15%, and more preferably a mass content of 4-10%.

[0033] In the liquid crystal composition of the present invention, it is further preferred that the compound represented by the aforementioned formula I contains the compound represented by formula I-5, and the mass content is 1-15%, and more preferably the mass content is 4-10%.

[0034] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula II is selected from the group consisting of compounds represented by the following formulae II-1 to II-16,

[0035]

[0036] In the liquid crystal composition of the present invention, it is further preferred that the compound represented by the aforementioned formula II comprises at least one compound of formula II-5, II-7 to II-9.

[0037] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula II-5 is 1-15%, and more preferably 4-10%.

[0038] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula II-7 is 1-15%, and more preferably 4-10%.

[0039] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula II-8 is 1-15%, and more preferably 4-10%.

[0040] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula II-9 is 1-15%, and more preferably 4-10%.

[0041] The liquid crystal composition of the present invention, preferably, further comprises one or more compounds represented by formula III,

[0042]

[0043] in,

[0044] R 4 , R 5 Each independently represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, or an alkenyl group having 2 to 10 carbon atoms, wherein R 4 , R 5 At least one of them represents an alkenyl group having 2 to 10 carbon atoms.

[0045] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula III is selected from the group consisting of compounds represented by the following formulae III-1 to III-7,

[0046]

[0047] In the liquid crystal composition of the present invention, it is further preferred that the compound represented by the aforementioned formula III comprises at least one of the compounds represented by III-1 to III-3 and III-6.

[0048] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula III-1 in the liquid crystal composition is 1-60%, and more preferably 20-40%.

[0049] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula III-2 in the liquid crystal composition is 0-15%, and more preferably 5-10%.

[0050] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula III-3 in the liquid crystal composition is 0-15%, and more preferably 5-10%.

[0051] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula III-6 in the liquid crystal composition is 0-15%, and more preferably 5-10%.

[0052] The liquid crystal composition of the present invention, preferably, further comprises one or more compounds represented by formula IV,

[0053]

[0054] R 6 represents H or a chain alkyl group having 1 to 10 carbon atoms, wherein one or more non-adjacent -CH 2 - may be substituted by cyclopentylene or cyclopropylene;

[0055] express

[0056] m represents 0 or 1;

[0057] X 3 Indicates -H or -CH 3 .

[0058] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula IV is selected from the compounds represented by the following formulas IV-1 to IV-4,

[0059]

[0060] R 6represents H or a chain alkyl group having 1 to 10 carbon atoms, wherein one or more non-adjacent -CH 2 - may be substituted by cyclopentylene or cyclopropylene.

[0061] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula IV-1 is selected from the group consisting of compounds represented by the following formulae IV-1-1 to IV-1-6,

[0062]

[0063] In the liquid crystal composition of the present invention, it is further preferred that the compound represented by the aforementioned formula IV comprises at least one of the compounds represented by IV-1-2 and IV-1-5.

[0064] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula IV-1-2 in the liquid crystal composition is 0-20%, and more preferably 5-15%.

[0065] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula IV-1-5 in the liquid crystal composition is 0-20%, and more preferably 5-15%.

[0066] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula IV-2 is selected from the group consisting of compounds represented by the following formulae IV-2-1 to IV-2-6,

[0067]

[0068]

[0069] In the liquid crystal composition of the present invention, it is further preferred that the compound represented by the aforementioned formula IV comprises at least one of the compounds represented by IV-2-2 to IV-2-6.

[0070] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula IV-2-2 in the liquid crystal composition is 0-8%, and more preferably 3-8%.

[0071] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula IV-2-3 in the liquid crystal composition is 0-8%, and more preferably 1-5%.

[0072] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula IV-2-4 in the liquid crystal composition is 0-8%, and more preferably 1-5%.

[0073] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula IV-2-5 in the liquid crystal composition is 0-8%, and more preferably 1-5%.

[0074] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula IV-2-6 in the liquid crystal composition is 0-8%, and more preferably 1-5%.

[0075] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula IV-3 is selected from the group consisting of compounds represented by the following formulae IV-3-1 to IV-3-6,

[0076]

[0077]

[0078] In the liquid crystal composition of the present invention, it is further preferred that the compound represented by the aforementioned formula IV comprises at least one of the compounds represented by IV-3-2 and IV-3-5.

[0079] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula IV-3-2 in the liquid crystal composition is 0-20%, and more preferably 5-15%.

[0080] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula IV-3-5 in the liquid crystal composition is 0-20%, and more preferably 5-15%.

[0081] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula IV-4 is selected from the group consisting of compounds represented by the following formulae IV-4-1 to IV-4-6,

[0082]

[0083] In the liquid crystal composition of the present invention, it is further preferred that the compound represented by the aforementioned formula IV comprises at least one of the compounds represented by IV-4-2 to IV-4-6.

[0084] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula IV-4-2 in the liquid crystal composition is 0-8%, and more preferably 3-8%.

[0085] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula IV-4-3 in the liquid crystal composition is 0-8%, and more preferably 1-5%.

[0086] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula IV-4-4 in the liquid crystal composition is 0-8%, and more preferably 1-5%.

[0087] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula IV-4-5 in the liquid crystal composition is 0-8%, and more preferably 1-5%.

[0088] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula IV-4-6 in the liquid crystal composition is 0-8%, and more preferably 1-5%.

[0089] The liquid crystal composition of the present invention, preferably, further comprises one or more compounds represented by formula V,

[0090]

[0091] in,

[0092] R 7 represents H or a chain alkyl group having 1 to 10 carbon atoms, wherein one or more non-adjacent -CH 2 - may be substituted by cyclopentylene or cyclopropylene;

[0093] Each independently expresses and At least one of the

[0094] X 4 Indicates -H or -CH 3 .

[0095] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula V is selected from the group consisting of compounds represented by the following formulas V-1 to V-8,

[0096]

[0097] in,

[0098] R 7 represents H or a chain alkyl group having 1 to 10 carbon atoms, wherein one or more non-adjacent -CH 2 - may be substituted by cyclopentylene or cyclopropylene.

[0099] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula V-1 is selected from the group consisting of compounds represented by the following formulas V-1-1 to V-1-5,

[0100]

[0101]

[0102] In the liquid crystal composition of the present invention, it is further preferred that the compound represented by the aforementioned formula V comprises at least one of the compounds represented by V-1-1, V-1-2, and V-1-5.

[0103] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula V-1-1 in the liquid crystal composition is 0-8%, and more preferably 2-6%.

[0104] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula V-1-2 in the liquid crystal composition is 0-8%, and more preferably 2-6%.

[0105] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula V-1-5 in the liquid crystal composition is 0-8%, and more preferably 2-6%.

[0106] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula V-2 is selected from the group consisting of compounds represented by the following formulas V-2-1 to V-2-5,

[0107]

[0108]

[0109] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula V-2-3 in the liquid crystal composition is 0-8%, and more preferably 2-6%.

[0110] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula V-3 is selected from the group consisting of the compounds represented by the following formulas V-3-1 to V-3-4,

[0111]

[0112] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula V-3-2 in the liquid crystal composition is 0-8%, and more preferably 2-6%.

[0113] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula V-3-3 in the liquid crystal composition is 0-8%, and more preferably 2-6%.

[0114] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula V-4 is selected from the group consisting of the compounds represented by the following formulas V-4-1 to V-4-4,

[0115]

[0116] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula V-4-2 in the liquid crystal composition is 0-10%, and more preferably 4-8%.

[0117] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula V-5 is selected from the group consisting of compounds represented by the following formulas V-5-1 to V-5-5,

[0118]

[0119] In the liquid crystal composition of the present invention, it is further preferred that the compound represented by the aforementioned formula V comprises at least one of the compounds represented by V-5-1, V-5-2, and V-5-5.

[0120] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula V-5-1 in the liquid crystal composition is 0-8%, and more preferably 2-6%.

[0121] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula V-5-2 in the liquid crystal composition is 0-8%, and more preferably 2-6%.

[0122] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula V-5-5 in the liquid crystal composition is 0-8%, and more preferably 2-6%.

[0123] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula V-6 is selected from the group consisting of compounds represented by the following formulas V-6-1 to V-6-5,

[0124]

[0125] The liquid crystal composition of the present invention is further preferably such that the mass content of the compound represented by the aforementioned formula V-6-3 in the liquid crystal composition is 0-8%, and further preferably 2-6%.

[0126] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula V-7 is selected from the group consisting of the compounds represented by the following formulas V-7-1 to V-7-4,

[0127]

[0128] The liquid crystal composition of the present invention is further preferably such that the mass content of the compound represented by the aforementioned formula V-7-2 in the liquid crystal composition is 0-8%, and further preferably 2-6%.

[0129] The liquid crystal composition of the present invention is further preferably such that the mass content of the compound represented by the aforementioned formula V-7-3 in the liquid crystal composition is 0-8%, and further preferably 2-6%.

[0130] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula V-8 is selected from the group consisting of the compounds represented by the following formulas V-8-1 to V-8-4,

[0131]

[0132] The liquid crystal composition of the present invention is further preferably such that the mass content of the compound represented by the aforementioned formula V-8-2 in the liquid crystal composition is 0-10%, and further preferably 4-8%.

[0133] The liquid crystal composition of the present invention, preferably, further comprises one or more compounds represented by formula VI,

[0134]

[0135] in,

[0136] R 8 represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, or an alkenyl group having 2 to 10 carbon atoms, wherein one or more non-adjacent -CH 2 - may be substituted by cyclopentylene or cyclopropylene;

[0137] X 5 Indicates -H or -CH 3 .

[0138] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula VI is selected from the group consisting of compounds represented by the following formulae VI-1 to VI-10,

[0139]

[0140]

[0141] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula VI-3 in the liquid crystal composition is 0-10%, and more preferably 2-7%.

[0142] The liquid crystal composition of the present invention, preferably, further comprises one or more compounds represented by formula VII,

[0143]

[0144] in,

[0145] R 9 , R 10 Each independently represents an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms;

[0146] express

[0147] n represents 1 or 2. When n represents 2, The structures may be the same or different.

[0148] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula VII is selected from the group consisting of compounds represented by the following formulas VII-1 to VII-5,

[0149]

[0150] in,

[0151] R 9 , R 10 Each independently represents an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms.

[0152] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula VII-1 is selected from the group consisting of compounds represented by the following formulae VII-1-1 to VII-1-6,

[0153]

[0154] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula VII-1-2 in the liquid crystal composition is 0-10%, and more preferably 1-5%.

[0155] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula VII-2 is selected from the group consisting of compounds represented by the following formulae VII-2-1 to VII-2-6,

[0156]

[0157] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula VII-2-4 in the liquid crystal composition is 0-14%, and more preferably 0-10%.

[0158] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula VII-3 is selected from the group consisting of compounds represented by the following formulae VII-3-1 to VII-3-8,

[0159]

[0160] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula VII-3-1 in the liquid crystal composition is 0-10%, and more preferably 3-8%.

[0161] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula VII-3-6 in the liquid crystal composition is 0-20%, and more preferably 5-15%.

[0162] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula VII-3-7 in the liquid crystal composition is 0-15%, and more preferably 5-10%.

[0163] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula VII-3-8 in the liquid crystal composition is 0-10%, and more preferably 3-8%.

[0164] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula VII-4 is selected from the group consisting of compounds represented by the following formulae VII-4-1 to VII-4-11,

[0165]

[0166]

[0167] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula VII-4-1 in the liquid crystal composition is 0-10%, and more preferably 3-8%.

[0168] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula VII-4-3 in the liquid crystal composition is 0-10%, and more preferably 3-8%.

[0169] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula VII-4-10 in the liquid crystal composition is 0-10%, and more preferably 3-8%.

[0170] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula VII-4-11 in the liquid crystal composition is 0-10%, and more preferably 3-8%.

[0171] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula VII-5 is selected from the group consisting of compounds represented by the following formulae VII-5-1 to VII-5-19,

[0172]

[0173]

[0174] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula VII-5-2 in the liquid crystal composition is 0-8%, and more preferably 1-5%.

[0175] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula VII-5-14 in the liquid crystal composition is 0-10%, and more preferably 1-5%.

[0176] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula VII-5-15 in the liquid crystal composition is 0-20%, and more preferably 5-20%.

[0177] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula VII-5-16 in the liquid crystal composition is 0-10%, and more preferably 1-5%.

[0178] The liquid crystal composition of the present invention, preferably, further comprises one or more compounds represented by formula VIII,

[0179]

[0180] in,

[0181] R 12 represents an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms;

[0182] R 13 Indicates F or OCF 3 ;

[0183] (F) means H or F;

[0184] express

[0185] a means 2 or 3, The structures may be the same or different.

[0186] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula VIII is selected from the group consisting of compounds represented by the following formulas VIII-1 to VIII-4,

[0187]

[0188] R 12 represents an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms;

[0189] R 13 Indicates F or OCF 3 .

[0190] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula VIII-1 is selected from the group consisting of compounds represented by the following formulas VIII-1-1 to VIII-1-4,

[0191]

[0192] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula VIII-1-2 in the liquid crystal composition is 0-8%, and more preferably 3-5%.

[0193] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula VIII-2 is selected from the group consisting of compounds represented by the following formulas VIII-2-1 to VIII-2-4,

[0194]

[0195] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula VIII-2-3 in the liquid crystal composition is 0-8%, and more preferably 3-5%.

[0196] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula VIII-3 is selected from the group consisting of the compounds represented by the following formulas VIII-3-1 to VIII-3-4,

[0197]

[0198] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula VIII-4 is selected from the group consisting of the compounds represented by the following formulas VIII-4-1 to VIII-4-4,

[0199]

[0200] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula VIII-4-2 in the liquid crystal composition is 0-8%, and more preferably 3-5%.

[0201] The liquid crystal composition of the present invention, preferably, further comprises one or more compounds represented by formula IX-1 and / or IX-2,

[0202]

[0203] in,

[0204] R 14 represents an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms;

[0205] R 15 represents an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms;

[0206] express

[0207] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula IX-1 is selected from the group consisting of compounds represented by the following formulas IX-1-1 to IX-1-5,

[0208]

[0209]

[0210] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula IX-1-1 in the liquid crystal composition is 0-10%, and more preferably 4-8%.

[0211] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula IX-1-3 in the liquid crystal composition is 0-10%, and more preferably 4-8%.

[0212] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula IX-2 is selected from the group consisting of compounds represented by the following formulas IX-2-1 to IX-2-15,

[0213]

[0214] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula IX-2-9 in the liquid crystal composition is 0-10%, and more preferably 3-8%.

[0215] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula IX-2-11 in the liquid crystal composition is 0-15%, and more preferably 5-12%.

[0216] The liquid crystal composition of the present invention, preferably, further comprises one or more compounds represented by formula X,

[0217]

[0218] in,

[0219] R 16 , R 17 Each independently represents an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms;

[0220] Z represents an alkenyl group having 2 to 10 carbon atoms or -COO-.

[0221] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula X is selected from the group consisting of compounds represented by the following formulas X-1 to X-6,

[0222]

[0223] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula X-5 in the liquid crystal composition is 0-10%, and more preferably 3-8%.

[0224] The liquid crystal composition of the present invention, preferably, further comprises one or more compounds represented by formula XI,

[0225]

[0226] in,

[0227] R 18 , R 19 Each independently represents an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms.

[0228] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula XI is selected from the group consisting of compounds represented by the following formulae XI-1 to XI-3,

[0229]

[0230] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula XI-2 in the liquid crystal composition is 0-5%, and more preferably 1-4%.

[0231] The liquid crystal composition of the present invention, preferably, further comprises one or more compounds represented by formula XII,

[0232]

[0233] in,

[0234] R 20 represents a chain alkyl group having 1 to 10 carbon atoms, wherein one or more non-adjacent -CH 2 - may be substituted by cyclopentylene or cyclopropylene.

[0235] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula XII is selected from the group consisting of compounds represented by the following formulas XII-1 to XII-3,

[0236]

[0237] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula XII-1 in the liquid crystal composition is 0-3%, and more preferably 0.5-2%.

[0238] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula XII-3 in the liquid crystal composition is 0-3%, and more preferably 0.5-2%.

[0239] The liquid crystal composition of the present invention, preferably, further comprises one or more compounds represented by formula Y,

[0240]

[0241] in,

[0242] R 21 , R 22 Each independently represents an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms;

[0243] express

[0244] b represents 0 or 1.

[0245] Adding the compound represented by formula Y into the liquid crystal composition of the present invention can well improve the low-temperature performance of the liquid crystal composition.

[0246] In the liquid crystal composition of the present invention, preferably, the compound represented by the aforementioned formula Y is selected from the group consisting of compounds represented by the following formulae Y-1 to Y-78,

[0247]

[0248]

[0249]

[0250] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the above formula Y-2 in the liquid crystal composition is 0-10%, and more preferably 1-5%.

[0251] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the above formula Y-3 in the liquid crystal composition is 0-10%, and more preferably 1-5%.

[0252] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the above formula Y-6 in the liquid crystal composition is 0-10%, and more preferably 1-5%.

[0253] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula Y-24 in the liquid crystal composition is 0-10%, and more preferably 1-5%.

[0254] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula Y-34 in the liquid crystal composition is 0-10%, and more preferably 1-5%.

[0255] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula Y-35 in the liquid crystal composition is 0-10%, and more preferably 1-5%.

[0256] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula Y-48 in the liquid crystal composition is 0-10%, and more preferably 1-5%.

[0257] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula Y-60 in the liquid crystal composition is 0-10%, and more preferably 1-5%.

[0258] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula Y-61 in the liquid crystal composition is 0-10%, and more preferably 1-5%.

[0259] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula Y-76 in the liquid crystal composition is 0-10%, and more preferably 1-5%.

[0260] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula Y-77 in the liquid crystal composition is 0-10%, and more preferably 1-5%.

[0261] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the compound represented by the aforementioned formula Y-78 in the liquid crystal composition is 0-10%, and more preferably 1-5%.

[0262] The liquid crystal composition of the present invention, preferably, further comprises the following compound CP,

[0263]

[0264] In the liquid crystal composition of the present invention, it is further preferred that the mass content of the aforementioned CP compound is 1-5%, and further preferably, the mass content is 1-3%.

[0265] Various functional dopants may be added to the liquid crystal compound of the present invention. The content of the dopant is preferably between 0.01% and 1%. These dopants include, for example, antioxidants and light stabilizers.

[0266] Antioxidants include,

[0267]

[0268] Wherein, t represents an integer from 1 to 10,

[0269] Light stabilizers include,

[0270]

[0271] [Liquid crystal display element or liquid crystal display]

[0272] The present invention also relates to a liquid crystal composition, a liquid crystal display element or a liquid crystal display comprising any one of the above-mentioned liquid crystal compositions; the display element or the display is an active matrix display element or the display or a passive matrix display element or the display.

[0273] The liquid crystal display element or liquid crystal display device containing the liquid crystal composition of the present invention is preferably an active matrix addressed liquid crystal display element or liquid crystal display device.

[0274] The liquid crystal display element or liquid crystal display comprising the liquid crystal composition of the present invention has a faster response speed and a smaller scattering coefficient, and can effectively improve the response speed and contrast of the liquid crystal display element or liquid crystal display.

[0275] Example

[0276] In order to explain the present invention more clearly, the present invention is further described below in conjunction with preferred embodiments. It should be understood by those skilled in the art that the following specific description is illustrative rather than restrictive, and should not be used to limit the scope of protection of the present invention.

[0277] In the present invention, the preparation methods are conventional methods unless otherwise specified, the raw materials used are all available from public commercial channels unless otherwise specified, the percentages are all mass percentages, the temperatures are in degrees Celsius (°C), and the specific meanings of other symbols and test conditions are as follows:

[0278] Tni represents the clearing point of liquid crystal (℃), measured by DSC quantitative method;

[0279] Δn represents optical anisotropy, Δn = n e -n o , where n o is the refractive index of ordinary light, n e It is the refractive index of extraordinary light, tested under two conditions: 25±2℃ and 60±2℃, 589nm, and Abbe refractometer.

[0280] Δε represents dielectric anisotropy, Δε=ε ∥ -ε ⊥ , where ε ∥ is the dielectric constant parallel to the molecular axis, ε⊥ is the dielectric constant perpendicular to the molecular axis, the test conditions are 25±0.5℃, 20 μm antiparallel box, INSTEC:ALCT-IR1 test;

[0281] γ 1 It represents the rotational viscosity (mPa·s), the test conditions are 25±0.5℃, 20 micron vertical box, INSTEC: ALCT-IR1 test;

[0282] K 11 is the splay elastic constant, K 33 is the bending elastic constant, K 22 is the torsional elastic constant, the test conditions are: 25±2℃, INSTEC:ALCT-IR1, 20μm vertical box; Kave=(K 11 +K 22 +K 33 ) / 3

[0283] Scattering coefficient of liquid crystal composition

[0284] S LC ={(n e +n o ) 2 *△n 2} / K ave

[0285] Among them, S LC is the scattering coefficient of the liquid crystal layer, which characterizes the scattering intensity; the rest are parameters of the liquid crystal material.

[0286] Low temperature storage: Pour the liquid crystal composition into a TN-4.0 liquid crystal cell and place it in a glove box at -20, -30, or -40°C. Observe every 24 hours to see if there is crystal precipitation. Observe for at least 240 hours and record the experimental data.

[0287] The preparation method of the liquid crystal composition is as follows: each liquid crystal monomer is weighed according to a certain ratio and put into a stainless steel beaker, the stainless steel beaker containing each liquid crystal monomer is placed on a magnetic stirring instrument to heat and melt, after most of the liquid crystal monomers in the stainless steel beaker are melted, a magnetic rotor is added to the stainless steel beaker, the mixture is stirred evenly, and the liquid crystal composition is obtained after cooling to room temperature.

[0288] The liquid crystal monomer structure of the embodiment of the present invention is represented by a code, and the code representation method of the liquid crystal ring structure, end group, and linking group is shown in Table 1 and Table 2 below.

[0289] Table 1 Corresponding codes of ring structure

[0290]

[0291]

[0292] Table 2 Corresponding codes of terminal groups and linking groups

[0293]

[0294]

[0295] Example:

[0296] Its code is CC-Cp-V1;

[0297] Its code is CPY-2-O2;

[0298] Its code is CCY-3-O2; Its code is LY-3-O2;

[0299] Its code is PGP-Cpr1-2; Its code is CY-3-O2;

[0300] Its code is PP-1-2V;

[0301] Its code is PGP-5-2;

[0302] Its code is CPU-3-O2;

[0303] Its code is CPU-5-O3;

[0304] Its code is CPU-3-F;

[0305] Its code is APUQU-2-F; Its code is DPUQU-3-F; Its code is CCGU-3-F;

[0306] Its code is CCVC-3-V.

[0307] The present invention is described below using specific embodiments:

[0308] Example

[0309] Example 1

[0310] The formula of the liquid crystal composition and the corresponding properties are shown in Table 3 below.

[0311] Table 3 Formulation of the liquid crystal composition of Example 1 and corresponding properties

[0312]

[0313]

[0314] Comparative Example 1

[0315] The formula of the liquid crystal composition and the corresponding properties are shown in Table 4 below.

[0316] Table 4 Formula and corresponding properties of the liquid crystal composition of Comparative Example 1

[0317] category Liquid crystal monomer code content(%) Ⅲ CC-3-V 26 Ⅲ CC-3-V1 10 Ⅲ CC-3-2V1 10 Ⅶ CCP-V-1 10 Ⅶ CCP-3-1 8 Ⅴ DPUQU-4-F 3 Y CLY-3-O2 2 PGU-2-F 4.5 Ⅰ PGP-V2-OT 7 Ⅶ CP-3-O2 4 Y CY-3-O2 1 Ⅳ PGUQU-3-F 5 Ⅶ CPP-3-1 3.5 Ⅸ-1 CCP-3-OT 6

[0318] Comparative Example 2

[0319] The formula of the liquid crystal composition and the corresponding properties are shown in Table 5 below.

[0320] Table 5: Formulation and corresponding properties of the liquid crystal composition of Comparative Example 2

[0321]

[0322]

[0323] Comparative Example 3

[0324] The formula of the liquid crystal composition and the corresponding properties are shown in Table 6 below.

[0325] Table 6 Formulation of liquid crystal composition of comparative example 3 and corresponding properties

[0326] category Liquid crystal monomer code content(%) Ⅲ CC-3-V 26 Ⅲ CC-3-V1 10 Ⅲ CC-3-2V1 10 Ⅶ CCP-V-1 11 Ⅶ CCP-3-1 8 Ⅴ DPUQU-4-F 4 Y CLY-3-O2 2 PGU-2-F 6 Ⅶ PGP-2-2V 7 Ⅶ CP-3-O2 4 Y CY-3-O2 1 Ⅳ PGUQU-3-F 5 Ⅸ-1 CCP-3-OT 6

[0327] Comparative Example 4

[0328] The formula of the liquid crystal composition and the corresponding properties are shown in Table 7 below.

[0329] Table 7 Formulation of liquid crystal composition of comparative example 4 and corresponding properties

[0330]

[0331]

[0332] Table 8

[0333] Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 T 99 97 99 95 98 Δn 0.104 0.105 0.104 0.105 0.103 <![CDATA[n e ]]> 1.588 1.589 1.588 1.590 1.584 <![CDATA[n o ]]> 1.484 1.485 1.484 1.485 1.481 Δε 3.9 3.9 3.9 3.8 4.0 <![CDATA[ε ⊥ ]]> 3.0 3.0 3.0 3.1 3.0 <![CDATA[γ 1 ]]> 62.5 63.2 68.4 62.5 65.3 <![CDATA[K 11 ]]> 19.5 17.6 18.9 16.5 19.5 <![CDATA[K 22 ]]> 9.8 8.8 9.5 8.3 9.75 <![CDATA[K 33 ]]> 20.2 19.5 19.9 18.6 20 <![CDATA[γ 1 / K 11 ]]> 3.2 3.6 3.6 3.8 3.3 <![CDATA[K 11 / No]]> 5.1 4.5 4.9 4.3 4.9 Kave 16.5 15.3 16.1 14.5 16.4 <![CDATA[Liquid crystal scattering coefficient S LC > 0.00620 0.00676 0.00634 0.00717 0.00605 Low temperature -20℃ cell ≥240h ≥240h ≥240h ≥240h ≥240h Low temperature -30℃ cell ≥240h ≥240h ≥240h ≥240h ≤24h Low temperature -40℃ cell ≥240h ≥240h ≥240h ≥240h ≤24h

[0334] Comparative Example 1 does not contain the compound of Formula II of the present invention. When the optical anisotropy Δn and the dielectric anisotropy Δε are at the same level as those of Example 1 of the present invention, the γ 1 / K 11 becomes larger, the response becomes slower, the scattering coefficient increases, and the contrast decreases; Comparative Example 2 does not contain the compound represented by Formula I of the present invention. When the optical anisotropy Δn and the dielectric anisotropy Δε are at the same level as those of Example 1 of the present invention, the γ 1 / K 11 becomes larger, the response becomes slower, the scattering coefficient increases, and the contrast decreases; Comparative Example 3 does not contain the compounds represented by Formula I and Formula II of the present invention. When the optical anisotropy Δn and the dielectric anisotropy Δε are at the same level as those in Example 1 of the present invention, the γ 1 / K 11 becomes larger, the response becomes slower, the scattering coefficient increases, and the contrast decreases; Comparative Document 4 does not contain the compound shown in Formula I, and the low-temperature performance is poor. In summary, Comparative Examples 1-4 do not belong to the technical solution of the present invention. Although the optical anisotropy Δn and dielectric anisotropy Δε can reach the same level as the technical solution of the present invention, the response is slow, the contrast is poor or the low-temperature performance is poor. Therefore, the technical solution of the present invention can be used to develop a liquid crystal composition with fast response, high contrast and good low-temperature performance through the synergistic effect of the compounds shown in Formula I and Formula II.

[0335] Example 2

[0336] The formula of the liquid crystal composition and the corresponding properties are shown in Table 9 below.

[0337] Table 9 Formulation of the liquid crystal composition of Example 2 and corresponding properties

[0338] category Liquid crystal monomer code content(%) Ⅲ CC-3-2V1 10 Ⅲ CC-3-V 21.5 Ⅲ CC-3-V1 10 Ⅶ CCP-3-1 8 Ⅸ-1 CCP-3-OT 2.9 Ⅶ CCP-V2-1 3 Ⅴ CDUQU-3-F 5 II CLP-3-1 4 II CLP-3-T 7 II CLP-V-1 4 Y CLY-3-O2 2 Ⅶ CP-3-O2 3 Y CY-3-O2 1 Ⅴ DGUQU-3-F 3 Ⅰ PGP-V1-OT 5 Ⅶ PP-1-2V1 8 Ⅻ PPGU-3-F 0.1 Ⅳ PUQU-3-F 2.5

[0339] Example 3

[0340] The formula of the liquid crystal composition and the corresponding properties are shown in Table 10 below.

[0341] Table 10 Formulation and corresponding properties of the liquid crystal composition of Example 3

[0342]

[0343]

[0344] Example 4

[0345] The formula of the liquid crystal composition and the corresponding properties are shown in Table 11 below.

[0346] Table 11 Formulation of liquid crystal composition of Example 4 and corresponding properties

[0347] category Liquid crystal monomer code content(%) Ⅲ CC-3-2V1 10 Ⅲ CC-3-V 25.9 Ⅲ CC-3-V1 10 Ⅲ CC-5-V1 8 Ⅸ-1 CCP-3-OT 6 Ⅷ CCPG-3-F 3 Ⅶ CCP-V2-1 8 II CLP-3-T 3 Ⅴ DPUQU-4-F 3 Ⅰ PGP-1V2-OT 6 PGU-3-F 5 Ⅳ PGUQU-3-F 3 Ⅶ PP-1-2V1 9 Ⅻ PPGU-Cp-F 0.1

[0348] Example 5

[0349] The formula of the liquid crystal composition and the corresponding properties are shown in Table 12 below.

[0350] Table 12 Formulation and corresponding properties of the liquid crystal composition of Example 5

[0351] category Liquid crystal monomer code content(%) Ⅲ CC-5-V1 9 Ⅲ CC-3-V 32.5 Ⅲ CC-3-V1 10 Ⅳ PUQK-3-F 5 Ⅴ DGUQK-3-F 3 Ⅶ CCP-V2-1 9 Ⅴ APUQK-2-F 3 II CLP-3-1 8 Ⅰ PGP-1V1-OT 10 Ⅶ PPGU-3-F 0.5 II CLP-V-1 6 Ⅰ PGP-2-2V 4

[0352] Table 13

[0353] Recipe Name Example 2 Example 3 Example 4 Example 5 T 95 99 88 96.8 Δn 0.105 0.104 0.106 0.109 <![CDATA[n e ]]> 1.588 1.588 1.590 1.595 <![CDATA[n o ]]> 1.483 1.484 1.485 1.486 Δε 4.3 3.9 4.0 4.2 <![CDATA[ε ⊥ ]]> 3.1 3.0 2.7 2.8 <![CDATA[γ 1 ]]> 67.9 62.5 55.5 56.4 <![CDATA[K 11 ]]> 20.4 19.5 18.2 17.8 <![CDATA[K 22 ]]> 10.2 9.8 9.1 8.9 <![CDATA[K 33 ]]> 20.7 20.2 18.4 18.9 <![CDATA[γ 1 / K 11 ]]> 3.3 3.2 3.0 3.2 <![CDATA[K 11 / No]]> 4.7 5.1 4.5 4.3 Kave 17.1 16.5 15.2 15.2 <![CDATA[Liquid crystal scattering coefficient S LC > 0.00606 0.00620 0.00694 0.00735 Low temperature -20℃ cell ≥240h ≥240h ≥240h ≥240h Low temperature -30℃ cell ≥240h ≥240h ≥240h ≥240h Low temperature -40℃ cell ≥240h ≥240h ≤24h ≤96h

[0354] Example 6

[0355] The formula of the liquid crystal composition and the corresponding properties are shown in Table 14 below.

[0356] Table 14 Formulation and corresponding properties of the liquid crystal composition of Example 6

[0357] category Liquid crystal monomer code content(%) Ⅳ PGUQU-3-F 1.5 Ⅶ PGP-1-2V 5 Ⅲ CC-3-V1 9 II CLP-V-1 4 Ⅶ CPP-3-2V1 7 Ⅲ CC-3-V 31 Ⅻ PPGU-Cp-F 0.5 Ⅲ CC-4-V1 4 II CLP-3-T 5 Ⅳ PUQU-3-F 3 Y CLY-3-O2 2 II CLP-3-1 3 Ⅴ APUQU-Cp-F 4 Ⅲ CC-3-2V1 4 Ⅶ PGP-3-2V 5 Ⅰ PGP-V2-OT 10 Ⅶ CP-3-O2 2

[0358] Comparative Example 5

[0359] The formula of the liquid crystal composition and the corresponding properties are shown in Table 15 below.

[0360] Table 15 Formulation and corresponding properties of liquid crystal composition of comparative example 5

[0361] category Liquid crystal monomer code content(%) Ⅳ PGUQU-3-F 3 Ⅶ PGP-1-2V 5.5 Ⅲ CC-3-V1 9 Ⅶ CPP-3-2V1 7 Ⅲ CC-3-V 29 Ⅻ PPGU-Cp-F 0.5 Ⅲ CC-4-V1 4 Ⅸ-1 CCP-3-OT 5 Ⅳ PUQU-3-F 3 Y CLY-3-O2 2 Ⅴ APUQU-Cp-F 4 Ⅲ CC-3-2V1 4 Ⅶ PGP-3-2V 5 Ⅰ PGP-V2-OT 10 Ⅶ CP-3-O2 2 Ⅶ CCP-V-1 7

[0362] Comparative Example 6

[0363] The formula of the liquid crystal composition and the corresponding properties are shown in Table 16 below.

[0364] Table 16 Formulation and corresponding properties of liquid crystal composition of comparative example 6

[0365]

[0366]

[0367] Comparative Example 7

[0368] The formula of the liquid crystal composition and the corresponding properties are shown in Table 17 below.

[0369] Table 17 Formulation and corresponding properties of liquid crystal composition of comparative example 7

[0370] category Liquid crystal monomer code content(%) Ⅳ PGUQU-3-F 3 Ⅶ PGP-1-2V 3.5 Ⅲ CC-3-V1 9 Ⅶ CPP-3-2V1 7 Ⅲ CC-3-V 27.5 Ⅻ PPGU-Cp-F 0.5 Ⅲ CC-4-V1 4 Ⅸ-1 CCP-3-OT 5 Ⅳ PUQU-3-F 6.5 Y CLY-3-O2 2 Ⅴ APUQU-Cp-F 4 Ⅲ CC-3-2V1 4 Ⅶ PGP-3-2V 5 Ⅶ PGP-2-2V 10 Ⅶ CP-3-O2 2 Ⅶ CCP-V-1 7

[0371] Comparative Example 8

[0372] The formula of the liquid crystal composition and the corresponding properties are shown in Table 18 below.

[0373] Table 18 Formulation and corresponding properties of liquid crystal composition of comparative example 8

[0374]

[0375]

[0376] Table 19

[0377] Recipe Name Example 6 Comparative Example 5 Comparative Example 6 Comparative Example 7 Comparative Example 8 T 100 100 97 97 99 Δn 0.127 0.126 0.127 0.126 0.124 <![CDATA[n e ]]> 1.616 1.616 1.616 1.616 1.610 <![CDATA[n o ]]> 1.489 1.490 1.489 1.490 1.486 Δε 3.7 3.8 3.7 3.8 3.8 <![CDATA[ε ⊥ ]]> 2.9 2.9 2.9 3.0 2.8 <![CDATA[γ 1 ]]> 65.8 63.5 65.3 65.2 61.7 <![CDATA[K 11 ]]> 20.0 18.2 18.7 16.9 19.7 <![CDATA[K 22 ]]> 10.0 9.1 9.4 8.5 9.85 <![CDATA[K 33 ]]> 19.6 19.2 18.4 18.1 19.2 <![CDATA[γ 1 / K 11 ]]> 3.3 3.5 3.5 3.9 3.1 <![CDATA[K 11 / No]]> 5.4 4.8 5.0 4.5 5.3 Kave 16.5 15.5 15.5 14.5 16.3 <![CDATA[Liquid crystal scattering coefficient S LC > 0.00933 0.00987 0.01004 0.01064 0.00902 Low temperature -20℃ cell ≥240h ≥240h ≥240h ≥240h ≥240h Low temperature -30℃ cell ≥240h ≥240h ≥240h ≥240h ≤24h Low temperature -40℃ cell ≥240h ≥240h ≥240h ≥240h ≤24h

[0378] Comparative Example 5 does not contain the compound of Formula II of the present invention. When the optical anisotropy Δn and the dielectric anisotropy Δε are at the same level as those of Example 6 of the present invention, the γ 1 / K 11 becomes larger, the response becomes slower, the scattering coefficient increases, and the contrast decreases; Comparative Example 6 does not contain the compound represented by Formula I of the present invention. When the optical anisotropy Δn and the dielectric anisotropy Δε are at the same level as those of Example 6 of the present invention, the γ 1 / K 11 becomes larger, the response becomes slower, the scattering coefficient increases, and the contrast decreases; Comparative Example 7 does not contain the compounds represented by Formula I and Formula II of the present invention. When the optical anisotropy Δn and the dielectric anisotropy Δε are at the same level as those of Example 6 of the present invention, the γ 1 / K 11 becomes larger, the response becomes slower, the scattering coefficient increases, and the contrast decreases; Comparative Example 8 does not contain the compound represented by Formula I of the present invention, and the low-temperature performance is poor. In summary, Comparative Examples 4-8 do not belong to the technical solution of the present invention. Although the optical anisotropy Δn and dielectric anisotropy Δε can reach the same level as the technical solution of the present invention, the response is slow, the contrast is poor or the low-temperature performance is poor. Therefore, the technical solution of the present invention can be used to develop a liquid crystal composition with fast response, high contrast and good low-temperature performance through the synergistic effect of the compounds represented by Formula I and Formula II.

[0379] Example 7

[0380] The formula of the liquid crystal composition and the corresponding properties are shown in Table 20 below.

[0381] Table 20 Formulation and corresponding properties of the liquid crystal composition of Example 7

[0382] category Liquid crystal monomer code content(%) Ⅳ PGUQU-3-F 1.5 Ⅶ PGP-1-2V 5 Ⅲ CC-3-V1 9 II CLP-V-1 4 Ⅶ CPP-3-2V1 7 Ⅲ CC-3-V 31 Ⅻ PPGU-Cp-F 0.5 Ⅲ CC-4-V1 4 II CLP-3-T 5 Ⅳ PUQU-3-F 3 Y CLY-3-O2 2 II CLP-3-1 3 Ⅴ APUQU-Cp-F 4 Ⅲ CC-3-2V1 4 Ⅶ PGP-3-2V 5 Ⅰ PGP-V2-OT 10 Ⅶ CP-3-O2 2

[0383] Example 8

[0384] The formula of the liquid crystal composition and the corresponding properties are shown in Table 21 below.

[0385] Table 21 Formulation of the liquid crystal composition of Example 8 and corresponding properties

[0386] category Liquid crystal monomer code content(%) Ⅳ PGUQU-3-F 4.5 Ⅶ PGP-2-2V 10 Ⅲ CC-3-V1 9 II CLP-V-1 5 Ⅶ CPP-3-2V1 7 Ⅲ CC-3-V 28 Ⅻ PPGU-Cp-F 0.5 Ⅲ CC-4-V1 4 II CLP-3-T 5 Y CLY-3-O2 2 II CLP-3-1 5 Ⅴ CDUQU-3-F 2 Ⅲ CC-3-2V1 4 Ⅶ PGP-1-2V 5 Ⅰ PGP-1V1-OT 5 Ⅶ CP-3-O2 2 Ⅳ PUQU-3-F 2

[0387] Example 9

[0388] The formula of the liquid crystal composition and the corresponding properties are shown in Table 22 below.

[0389] Table 22 Formulation of liquid crystal composition of Example 9 and corresponding properties

[0390] category Liquid crystal monomer code content(%) Ⅲ CC-3-V 27 Ⅲ CC-3-V1 10 Ⅲ CC-3-2V1 10 Ⅶ CCP-V-1 4 Ⅶ PGP-2-2V 10 Ⅴ DGUQU-3-F 2 Ⅳ PGUQU-4-F 4 II CLP-V-1 5 II CLP-3-OT 5 II CLP-3-3 5 Ⅰ PGP-V1-OT 7 Ⅶ CP-3-O2 5 Y CPY-1V-2 3 Ⅳ PGUQU-3-F 3

[0391] Example 10

[0392] The formula of the liquid crystal composition and the corresponding properties are shown in Table 23 below.

[0393] Table 23 Formulation and corresponding properties of the liquid crystal composition of Example 10

[0394] category Liquid crystal monomer code content(%) Ⅲ CC-3-V 26 Ⅲ CC-3-V1 10 Ⅲ CC-3-2V1 10 Ⅲ CC-5-V1 10 Ⅰ PGP-V2-OT 6 Ⅰ PGP-V1-OT 5 Ⅰ PGP-1V2-OT 5 Ⅰ PGP-2V-OT 5 II CLP-3-O2 5 II CLP-3-1 5 II CLP-V-1 5 Ⅳ PGUQU-Cpr1-F 3 Ⅳ PGUQU-Cp-F 2 Ⅳ PUQU-Cpr1-F 3

[0395] Embodiment 11

[0396] The formula of the liquid crystal composition and the corresponding properties are shown in Table 24 below.

[0397] Table 24 Formulation of liquid crystal composition of Example 11 and corresponding properties

[0398] category Liquid crystal monomer code content(%) Ⅲ CC-3-V 24 Ⅲ CC-3-V1 10 Ⅲ CC-3-2V1 10 Ⅲ CC-5-V1 10 Ⅰ PGP-V2-OT 21 II CLP-3-O2 4 II CLP-3-1 4 II CLP-V-1 4 Ⅳ PGUQU-Cpr1-F 3 Ⅳ PGUQU-Cp-F 2 Ⅳ PUQU-Cpr1-F 3 Y CLY-3-O2 3 Y CY-3-O2 2

[0399] Example 12

[0400] The formula of the liquid crystal composition and the corresponding properties are shown in Table 25 below.

[0401] Table 25 Formulation of liquid crystal composition of Example 12 and corresponding properties

[0402] category Liquid crystal monomer code content(%) Ⅲ CC-3-V 23 Ⅲ CC-3-V1 8 Ⅲ CC-3-2V1 8 Ⅰ PGP-V2-OT 5 II CLP-3-1 5 II CLP-V-1 5 Ⅴ APUQK-3-F 3 Ⅳ PGUQK-3-F 6 Ⅶ CCP-V-1 5 Ⅶ CCP-V2-1 8 CPPC-3-3 4 Ⅶ PP-1-2V1 10 Ⅸ-2 CCG-VF 5 Ⅰ PGP-1V2-OT 5

[0403] Table 26

[0404]

[0405]

[0406] The smaller the scattering coefficient, the higher the contrast. Generally, when the scattering coefficient is increased by 5%, the contrast is significantly improved. The scattering coefficient of the liquid crystal composition provided in the embodiments of the present invention is increased by more than 5% compared with the scattering coefficient of the liquid crystal composition of the comparative example. Therefore, the contrast of the liquid crystal composition of the present invention is significantly improved.

[0407] Liquid crystal products are customized products. Depending on the needs of customers, there are two different technical solutions: low refractive index Δn and high refractive index Δn. Among them, for the low refractive index solution, some customers will require a lower refractive index, the purpose is to sacrifice transmittance to increase the contrast CR and maintain the response speed RT; for the high refractive index solution, some customers will require a high refractive index, the purpose is to maintain the existing transmittance and response speed RT, and then improve the contrast CR. The technical solution of the present invention can meet the needs of customers with low refractive index and high contrast, as well as high refractive index and high contrast through the synergistic combination of the compounds shown in Formula I and Formula II.

[0408] In summary, the liquid crystal composition of the present invention has good low temperature performance and a small rotational viscosity γ 1 and a larger elastic constant K, can be used to develop high-contrast and fast-response liquid crystal display elements or liquid crystal displays. The liquid crystal composition of the present invention is particularly suitable for Gaming MNT / NB type fast-response liquid crystal display elements or liquid crystal displays.

[0409] Obviously, the above embodiments disclosed in the present invention are only examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. A liquid crystal composition, characterized in that: The liquid crystal composition comprises one or more compounds represented by formula I and one or more compounds represented by formula II, in, R1 represents an alkenyl group having 2 to 10 carbon atoms or a fluorine-substituted alkenyl group having 2 to 10 carbon atoms; R2 represents F, an alkyl group having 1 to 10 carbon atoms, an alkyl group having 1 to 10 carbon atoms substituted with fluorine, an alkoxy group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms substituted with fluorine, an alkenyl group having 2 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms substituted with fluorine, an alkenyloxy group having 3 to 10 carbon atoms, or an alkenyloxy group having 3 to 10 carbon atoms substituted with fluorine; R3 represents F, an alkyl group having 1 to 10 carbon atoms, an alkyl group having 1 to 10 carbon atoms substituted with fluorine, an alkoxy group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms substituted with fluorine, an alkenyl group having 2 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms substituted with fluorine, or an alkenyloxy group having 3 to 10 carbon atoms substituted with fluorine.

2. The liquid crystal composition according to claim 1, characterized in that: The liquid crystal composition further comprises one or more compounds represented by formula III, in, R4 and R5 each independently represent an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms, wherein at least one of R4 and R5 represents an alkenyl group having 2 to 10 carbon atoms.

3. The liquid crystal composition according to claim 2, characterized in that: The liquid crystal composition further comprises one or more compounds represented by formula IV, in, R6 represents H or an alkyl radical having 1 to 10 carbon atoms, wherein one or more non-adjacent -CH2- radicals may be substituted by cyclopentylene or cyclopropylene; express m represents 0 or 1; X3 represents -H or -CH3.

4. The liquid crystal composition according to claim 2, characterized in that: The liquid crystal composition further comprises one or more compounds represented by formula V, in, R7 represents H or an alkyl radical having 1 to 10 carbon atoms, wherein one or more non-adjacent -CH2- radicals may be substituted by cyclopentylene or cyclopropylene; Each independently expresses and At least one of the X4 represents -H or -CH3.

5. The liquid crystal composition according to any one of claims 1 to 4, characterized in that: The liquid crystal composition further comprises one or more compounds represented by formula VI, in, R8 represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, or an alkenyl group having 2 to 10 carbon atoms, wherein one or more non-adjacent -CH2- groups may be substituted by a cyclopentylene group or a cyclopropylene group; X5 represents -H or -CH3.

6. The liquid crystal composition according to claim 4, characterized in that: The liquid crystal composition further comprises one or more compounds represented by formula VII, in, R9, R 10 Each independently represents an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms; express n represents 1 or 2. When n represents 2, The structures may be the same or different.

7. The liquid crystal composition according to claim 6, characterized in that: The liquid crystal composition further comprises one or more compounds represented by formula VIII, in, R 12 represents an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms; R 13 Indicates F or OCF3; (F) means H or F; express a means 2 or 3, The structures may be the same or different.

8. The liquid crystal composition according to claim 6, characterized in that: The liquid crystal composition further comprises one or more compounds represented by formula IX-1 and / or IX-2, in, R 14 represents an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms; R 15 represents an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms; express 9. The liquid crystal composition according to claim 8, characterized in that: The liquid crystal composition further comprises one or more compounds represented by formula X, in, R 16 , R 17 Each independently represents an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms; Z represents an alkenyl group having 2 to 10 carbon atoms or -COO-.

10. The liquid crystal composition according to claim 9, characterized in that: The liquid crystal composition further comprises one or more compounds represented by formula XI, in, R 18 , R 19 Each independently represents an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms.

11. The liquid crystal composition according to claim 6, characterized in that: The liquid crystal composition further comprises one or more compounds represented by formula XII, in, R 20 The term "alkyl" refers to an alkyl group having 1 to 10 carbon atoms, wherein one or more non-adjacent -CH2- groups may be substituted by a cyclopentylene group or a cyclopropylene group.

12. The liquid crystal composition according to claim 6, characterized in that: The liquid crystal composition further comprises one or more compounds represented by formula Y, in, R 21 , R 22 Each independently represents an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms; express b represents 0 or 1.

13. A liquid crystal display element or a liquid crystal display, characterized in that: The liquid crystal display device comprises the liquid crystal composition according to any one of claims 1 to 12, wherein the liquid crystal display device is an active matrix display device or a passive matrix display device.

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