High-refractive-index liquid crystal composition and application thereof

Abstract

The invention relates to the technical field of liquid crystal, and discloses a liquid crystal composition which comprises a compound shown as a general formula I, in which R1 represents a straight chain, branched chain or cyclic alkyl group containing 1-12 carbon atoms; r2 and X1-X11 respectively and independently represent-H, halogen or straight-chain, branched-chain or cyclic alkyl containing 1-12 carbon atoms, wherein one or more than two non-adjacent-CH2-in the straight-chain, branched-chain or cyclic alkyl containing 1-12 carbon atoms can be respectively and independently replaced by-CH = CH-,-C = C-,-O-,-CO-,-CO-O-or-O-CO-. According to the high-refractive-index liquid crystal composition and the application thereof, the composition has the advantages of excellent UV resistance, good low-temperature and high-temperature reliability and the like while the high refractive index can be kept, and the problems that existing alkyne and cyano-containing high-refractive-index liquid crystals are prone to chain breakage under the high-temperature and ultraviolet conditions, poor in reliability, poor in low-temperature performance, poor in stability and the like are solved. And the requirements of high-end display devices on response speed, image quality stability and wide-temperature application can not be met.

Description

[0001] This invention relates to the field of liquid crystal technology, specifically to a high refractive index liquid crystal composition and its applications, applicable to various display and non-display optoelectronic components, and particularly capable of meeting the performance requirements of high-end display devices in the field of thin film transistor technology (TFT-LCD). Background Technology

[0002] The optical properties of liquid crystals can be altered by applying voltage, making them primarily used as dielectrics in display devices. In the field of liquid crystal display technology, the electro-optical devices based on liquid crystals, as well as those familiar to technicians, are based on various effects. These devices mainly include dynamic scattering modes, DAP (distortion of aligned phases) modes, guest-host modes, TN modes with twisted nematic array structures, STN (super-twisted nematic) modes, SBE (super birefringence) modes, OMI (optical mode interference) modes, and GH (optical compensating bending) modes.

[0003] In TFT active matrix systems, the main display modes include TN (Twisted Nematic) mode, IPS (In-Plane Switching) mode, FFS (Fringe Field Switching) mode, and MVA (Multi-domain Vertical Alignment) mode.

[0004] In the field of thin-film transistor (TFT-LCD) technology, after decades of accumulation and development, the technology has gradually matured. However, people's demands for display technology are constantly increasing. In order to further pursue superior image quality, LCDs are required to achieve faster response times, more vibrant colors, and wider color gamuts; in terms of energy saving, lower driving voltage is needed to reduce power consumption. As one of the important optoelectronic materials for LCDs, liquid crystal materials play a crucial role in improving the performance of LCDs.

[0005] The current shortcomings of LCD as a display application are causing its market effect to be replaced by other display modes. Its specific shortcomings are slow response speed and inability to meet the needs of high-end displays. Therefore, how to improve the response of LCD and produce higher-end display products is the common pursuit of the entire LCD display industry.

[0006] Studies have shown that the relationship between the response time t parameter of a liquid crystal display element and the following formula is given:

[0007] ,

[0008] The main ways to improve the response of liquid crystals are to reduce viscosity γ, increase K value, and reduce cell thickness d. Due to the performance limitations of liquid crystal materials, the reduction of viscosity and the increase of K value are limited. From the perspective of device design, reducing cell thickness is currently the most significant method to improve the response space. However, to ensure that the optical changes brought about by the reduction of cell thickness are not compromised, increasing the refractive index of the liquid crystal is currently the feasible approach.

[0009] Currently, liquid crystals with high refractive index are basically liquid crystals containing alkyne, cyano, etc., which are prone to chain breakage under high temperature and ultraviolet conditions, forming other substances, resulting in poor reliability of liquid crystal materials and failing to meet reliability requirements.

[0010] Liquid crystal materials should possess a wide nematic phase temperature range to meet the application requirements of liquid crystal display devices, such as room temperature display devices, high temperature display devices, and low temperature display devices. The superior performance of single liquid crystal materials directly determines the superior performance of mixed liquid crystal materials;

[0011] Therefore, a high refractive index liquid crystal composition and its application are proposed to solve the above-mentioned problems. Summary of the Invention

[0012] (a) Technical problems to be solved

[0013] To address the shortcomings of existing technologies, this invention provides a high refractive index liquid crystal composition and its application, which possesses advantages such as maintaining a high refractive index while exhibiting excellent UV resistance, as well as good low-temperature and high-temperature reliability. This solves the problems of existing high refractive index liquid crystals containing acetylene and cyano groups being prone to chain breakage and having poor reliability under high-temperature and ultraviolet conditions, as well as poor low-temperature performance, which cannot meet the requirements of high-end display devices for response speed, image quality stability, and wide-temperature application.

[0014] (II) Technical Solution

[0015] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a liquid crystal composition comprising a liquid crystal compound of general formula I:

[0016]

[0017] in,

[0018] R1 indicates a straight-chain, branched, or cyclic alkyl group containing 1 to 12 carbon atoms.

[0019] R2, X1 to X11 each independently represent a straight-chain, branched, or cyclic alkyl group containing -H, halogen, or 1-12 carbon atoms, wherein one or more -CH2- atoms of the straight-chain, branched, or cyclic alkyl group containing 1-12 carbon atoms can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-, and one or more -H atoms can be independently replaced by -F or -Cl.

[0020] Z1 and Z2 independently represent -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CF2O-, -OCF2-, -(CH2)n-, -CF2CH2-, -CH2CF2-, -(CF2)n-, -CH2CH2-CO-O-, -O-CO-CH2CH2-, -CR1 R2- or a single bond;

[0021] n represents an integer from 0 to 2.

[0022] The beneficial effects of this invention are: compared with the prior art, the liquid crystal composition containing compound of general formula I of this invention has a large refractive index, excellent UV resistance, and good low-temperature performance, making it valuable for application.

[0023] This high-refractive-index liquid crystal composition and its application have the advantages of maintaining a high refractive index while having excellent UV resistance, as well as good low-temperature and high-temperature reliability.

[0024] Based on the above technical solution, the present invention can be further improved as follows.

[0025] Furthermore, the liquid crystal compounds of general formula I are selected from the group consisting of the following compounds:

[0026]

[0027]

[0028]

[0029]

[0030] As mentioned above, -CF3 indicates -OCF3 indicates

[0031] In embodiments of the present invention, at least one compound of general formula I with Z1 or Z2 being -CF2O- must be included.

[0032] The beneficial effects of adopting the above-mentioned further scheme are that the -CF2O- bridging bond structure can enhance the molecular conjugated system, significantly improve the optical anisotropy (refractive index) of the liquid crystal compound, and the stability of this structure is better than that of alkynyl and cyano groups. It can effectively resist the damage of ultraviolet rays and high temperature to the molecular chain, improve the UV resistance and high temperature reliability of the liquid crystal composition, and avoid performance degradation caused by chain breakage.

[0033] Furthermore, the liquid crystal compound of general formula I accounts for 0.1% to 40% of the total weight of the liquid crystal composition; the liquid crystal compound of general formula I accounts for 0.5% to 30% of the total weight of the liquid crystal composition.

[0034] In some embodiments of the present invention, the liquid crystal composition further comprises one or more compounds of general formula II.

[0035]

[0036] in

[0037] R3 represents -H, a straight-chain or branched alkyl group containing 1-12 carbon atoms. One or more non-adjacent -CH2- atoms in the straight-chain or branched alkyl group containing 1-12 carbon atoms can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-, and the straight-chain or branched alkyl group containing 1-12 carbon atoms... One or more -H can be independently replaced by -F or -Cl;

[0038] L1, L2, and L3 each independently represent -H, alkyl groups containing 1 to 3 carbon atoms, or halogens;

[0039] Y represents halogen, haloalkyl or haloalkoxy containing 1-5 carbon atoms, haloalkenyl or haloalkenoxy containing 2-5 carbon atoms, cyano or thiocyano.

[0040] ring express in, One or more -CH2- bonds can be replaced by -O- bonds, and one or more single bonds in a ring can be replaced by double bonds; One or more -H can be replaced by -CN, -F or -Cl, and -CH= in one or more rings can be replaced by -N=;

[0041] Z3 represents -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CF2O-, -OCF2-, -(CH2)n-, -CF2CH2-, -CH2CF2-, -(CF2)n-, -CH2CH2-CO-O-, -O-CO-CH2CH2-, -CR1 R2-, or a single bond;

[0042] n represents an integer from 0 to 3.

[0043] The beneficial effect of adopting the above-mentioned further scheme is that the content range of 0.1% to 40% can achieve a balance between refractive index improvement and other properties. If the content is too low, the required high refractive index effect cannot be achieved, and if the content is too high, it will easily lead to increased viscosity of the liquid crystal composition, decreased low-temperature fluidity, and even low-temperature precipitation problems. The preferred range of 0.5% to 30% can further optimize the overall performance, while ensuring a high refractive index (Δn can reach 0.135 to 0.1895) and maintaining a suitable viscosity and a wide nematic phase temperature range, thus meeting the requirements of display devices for response speed and environmental adaptability.

[0044] Compounds of general formula II have suitable dielectric anisotropy (Δε can be adjusted to 7.6 to 12.5), which can synergistically optimize the electric field response characteristics of liquid crystal compositions and reduce driving voltage with compounds of general formula I. At the same time, their molecular structure can broaden the nematic phase temperature range of liquid crystal compositions and improve low-temperature stability (e.g., no precipitation after 10 days at -30℃), making up for the deficiencies of single compounds of general formula I in dielectric properties or temperature adaptability, and meeting the needs of different display modes (e.g., TN, IPS).

[0045] Furthermore, the liquid crystal compounds of general formula II are selected from the group consisting of the following compounds:

[0046]

[0047]

[0048]

[0049] In some embodiments of the present invention, the liquid crystal composition further comprises one or more compounds of general formula A.

[0050]

[0051] in

[0052] RA2 represents a straight-chain or branched alkyl group containing 1-12 carbon atoms. One or more non-adjacent -CH2- atoms in the straight-chain or branched alkyl group containing 1-12 carbon atoms can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-, and the straight-chain or branched alkyl group containing 1-12 carbon atoms... One or more -H can be independently replaced by -F or -Cl;

[0053] ring and ring Each represents independently in, One or more -CH2- bonds can be replaced by -O- bonds, and one or more single bonds in a ring can be replaced by double bonds. One or more -H can be replaced by -CN, -F or -Cl, and -CH= in one or more rings can be replaced by -N=;

[0054] ZA22 represents a single bond, -CH2CH2-, -CF2CF2-, -CO-O-, -O-CO-, -O-CO-O-, -CH=CH-, -CF=CF-, -CH2O-, or -OCH2-;

[0055] LA21 and LA22 each independently represent -H, alkyl groups containing 1 to 3 carbon atoms, or halogens;

[0056] XA2 represents halogen, haloalkyl or haloalkoxy containing 1-5 carbon atoms, haloalkenyl or haloalkenoxy containing 2-5 carbon atoms;

[0057] Among them, at least one of LA21, LA22, and XA2 contains halogens;

[0058] nA2 represents 0, 1, 2, or 3.

[0059] The beneficial effects of adopting the above-mentioned further solutions are that the general formula II compounds (such as II-6 and II-14) with the above-mentioned specific structures have better compatibility with general formula I compounds, which can effectively avoid the separation or precipitation of the composition, and at the same time, the optical properties (such as improving Δn) and electrical properties (such as adjusting Δε) can be optimized in a targeted manner. For example, II-6 compound can enhance low temperature stability, and II-14 compound can improve dielectric anisotropy, so as to meet the performance customization requirements of different application scenarios.

[0060] The halogen substituents (such as F and Cl) contained in compounds of general formula A can enhance molecular polarity and stability. When combined with compounds of general formula I and II, they can further improve the UV resistance (VHR-UV up to 93.5% to 94.6%) and optical anisotropy of the liquid crystal composition. At the same time, their specific ring structure and bridging bonds (such as -CH2CH2- and -CF2CF2-) can reduce the viscosity of the composition and improve the response speed, meeting the needs of high-end displays for fast dynamic images. For example, compounds A-5 and A-8 can significantly improve low-temperature fluidity and UV resistance.

[0061] Furthermore, the liquid crystal compound of general formula A is selected from the group consisting of the following compounds:

[0062]

[0063]

[0064]

[0065] In some embodiments of the present invention, the liquid crystal composition further comprises one or more compounds of general formula M.

[0066]

[0067] in,

[0068] RM1 indicates a straight-chain or branched alkyl group containing 1-12 carbon atoms. One or more non-adjacent -CH2- atoms in the straight-chain or branched alkyl group containing 1-12 carbon atoms can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-.

[0069] RM2 represents halogen, straight-chain or branched alkyl groups containing 1-12 carbon atoms, One or more non-adjacent -CH2- atoms in the straight-chain or branched alkyl group containing 1-12 carbon atoms can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-.

[0070] ring ring and ring Each represents independently in One or more of the -CH2- can be replaced by -O-. At most one -H in the halogen can be replaced by a halogen;

[0071] ZM1 and ZM2 independently represent single bonds, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, -(CH2)4-, -CF2O-, -OCF2-, or -CF2CF2-; and

[0072] nM1 represents 0, 1, 2, or 3, where when nM1 = 2 or 3, the ring... They can be the same or different; ZM2 can be the same or different.

[0073] In some embodiments of the present invention, the compounds of general formula M are selected from the group consisting of the following compounds:

[0074]

[0075]

[0076]

[0077] In addition to the compounds mentioned above, the liquid crystal compositions of the present invention may also contain conventional nematic liquid crystals, smectic liquid crystals, cholesteric liquid crystals, antioxidants, ultraviolet absorbers, infrared absorbers, polymerizable monomers, or light stabilizers.

[0078] As shown below, possible dopants may be added to the liquid crystal composition according to the present invention.

[0079]

[0080]

[0081] The beneficial effects of adopting the above-mentioned further solutions are that the intermolecular forces of the above-mentioned general formula A compounds (such as A-2, A-4, A-8) with specific structures are highly matched with those of general formula I compounds, which can avoid phase separation and at the same time improve performance in a targeted manner. For example, A-2 compounds contain -CF3 groups, which can enhance UV resistance; A-4 compounds contain polyfluorine substitutions, which can improve optical anisotropy; and A-8 compounds contain specific ring structures, which can broaden the nematic phase temperature range and make the liquid crystal composition adaptable to more severe operating environments.

[0082] Compounds of general formula M have a wide nematic phase temperature range (Cp at the clearing point can reach 90-105℃) and low viscosity, which can compensate for the high viscosity problem that may exist in compounds of general formula I, and improve the response speed of liquid crystal compositions. At the same time, their molecular structure is stable and can work synergistically with compounds of general formula I, II and A to further broaden the temperature adaptability range (e.g. -40℃ to 150℃), and meet the application requirements of high temperature environment (e.g. automotive display) or low temperature environment (e.g. outdoor display). For example, compounds M-1 and M-4 can significantly reduce viscosity, and compound M-13 can improve high temperature stability.

[0083] The aforementioned general-form M compounds (such as M-1, M-4, M-11, and M-13) exhibit excellent compatibility with other general-form compounds and can effectively adjust the viscosity and temperature characteristics of liquid crystal compositions. For example, M-1 and M-4 compounds can reduce viscosity to a suitable range (ensuring response speed), while M-11 and M-13 compounds can improve high-temperature stability (VHR ≥ 94.2% after baking at 150°C). This allows the liquid crystal composition to achieve a balance of "low viscosity, wide temperature range, and high stability" in terms of performance, making it suitable for various display modes of TFT-LCDs.

[0084] Dopants (such as antioxidants and UV absorbers) can specifically enhance the anti-aging performance of liquid crystal compositions. Antioxidants can inhibit the oxidative degradation of molecules at high temperatures, while UV absorbers can block the damage of ultraviolet rays to the molecular structure, thereby extending the service life of liquid crystal display devices (such as increasing VHR-high temperature to 94.8% to 95.7%). At the same time, the dopant content is low (0 to 10%), which will not have a negative impact on the core performance of liquid crystals such as optical anisotropy and dielectric anisotropy, ensuring stable image quality of the device.

[0085] Furthermore, the dopant accounts for 0-10% of the weight percentage of the liquid crystal composition; more preferably, the dopant accounts for 0-5% of the weight percentage of the liquid crystal composition.

[0086] The following mentions, for example, that stabilizers can be added to the liquid crystal composition according to the present invention:

[0087]

[0088]

[0089]

[0090] Where n represents a positive integer from 1 to 12.

[0091] The beneficial effects of adopting the above-mentioned further scheme are that the dopant content of 0-10% can balance "performance enhancement" and "cost control", avoiding the increase in cost or performance fluctuation (such as increased viscosity) of the liquid crystal composition due to excessive content; while the preferred range of 0-5% can minimize the impact on the core performance of the liquid crystal (such as Δn, Δε) while ensuring anti-aging and anti-UV effects, which meets the economic and practical requirements of industrial production.

[0092] The stabilizers with the above-mentioned specific structures (such as compounds containing benzene rings, ester groups or ether bonds) can form weak interactions with liquid crystal molecules, inhibiting molecular degradation reactions (such as chain breaking and oxidation). At the same time, their molecular structures are highly compatible with liquid crystal compounds and will not cause precipitation or delamination. The alkyl chain design with n as a positive integer from 1 to 12 can adjust the solubility of the stabilizer in the liquid crystal, ensuring its uniform dispersion, thereby continuously exerting a stabilizing effect and ensuring the consistent performance of the liquid crystal composition over a long period of use.

[0093] Furthermore, the stabilizer is selected from the stabilizers shown below.

[0094]

[0095] The beneficial effects of adopting the above-mentioned further solution are that the selected stabilizer has highly efficient anti-degradation properties and can specifically inhibit free radical reactions caused by ultraviolet rays and high temperatures. Compared with ordinary stabilizers, its addition amount is lower but the effect is better, which can effectively improve the long-term reliability of the liquid crystal composition (such as VHR-initial ≥95.5%), while not affecting the optical and electrical properties of the liquid crystal, meeting the stringent requirements of high-end display devices for material stability.

[0096] Furthermore, the stabilizer accounts for 0-5% of the total weight of the liquid crystal composition.

[0097] The beneficial effect of adopting the above-mentioned further scheme is that the content range of 0-5% can avoid the negative effects caused by excessive stabilizer - such as excessive content may reduce the clearing point of liquid crystal, increase viscosity, or cause adverse interactions with other compounds; while this range can ensure that the stabilizer can play a full role, inhibit molecular degradation, and at the same time take into account the core performance of the liquid crystal composition, so as to meet the stability and consistency requirements of industrial production.

[0098] Furthermore, the stabilizer accounts for 0-1% of the total weight of the liquid crystal composition.

[0099] The beneficial effect of adopting the above-mentioned further scheme is that the preferred content of 0-1% can achieve a better balance between "stabilization effect" and "performance purity" - a low content of stabilizer can effectively inhibit degradation reaction, minimize interference with the core performance of liquid crystal such as optical anisotropy (Δn) and dielectric anisotropy (Δε), and ensure clear picture quality and stable response of liquid crystal display devices. It is especially suitable for high-end display fields with high performance and precision requirements, such as 4K / 8K displays.

[0100] Furthermore, the stabilizer accounts for 0.001%–0.5% of the total weight of the liquid crystal composition.

[0101] The beneficial effect of adopting the above-mentioned further scheme is that the particularly preferred content of 0.001% to 0.5% is based on the comprehensive optimization of "cost-effect-performance" - the minimum content of 0.001% can meet the basic stability requirements, and the maximum content of 0.5% can avoid performance fluctuations. This range can achieve high efficiency and stability at extremely low addition levels, significantly reduce material costs, and at the same time ensure the long-term performance stability of the liquid crystal composition, such as no significant performance degradation at -40℃ to 150℃, which has extremely high industrial application value. Attached Figure Description

[0102] Figure 1 This is a table of group structure codes for the liquid crystal compounds of this invention. Detailed Implementation

[0103] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0104] In the embodiments, by Figure 1 A high refractive index liquid crystal composition and its application are presented.

[0105] Unless otherwise specified, all proportions in this invention are weight ratios, and all temperatures are in degrees Celsius.

[0106] Take the following compound with the following structural formula as an example:

[0107]

[0108] The structural formula is used as follows Figure 1 The listed code can be expressed as nCCGF, where n represents the number of C atoms in the left-end alkyl group. For example, if n is "3", it means that the alkyl group is -C3H7. In the code, C represents cyclohexyl, G represents 2-fluoro-1,4-phenylene, and F represents fluorine.

[0109] The abbreviated codes for the test items in the following examples are as follows:

[0110]

[0111]

[0112] All components used in the following embodiments can be synthesized using known methods or obtained commercially. These synthesis techniques are conventional, and the resulting liquid crystal compounds have been tested and found to meet electronic compound standards.

[0113] Liquid crystal compositions were prepared according to the proportions of the liquid crystal compositions specified in the following examples. The liquid crystal compositions were prepared using conventional methods in the art, such as mixing in specified proportions by heating, ultrasound, or suspension.

[0114] The liquid crystal compositions given in the following examples were prepared and studied. The composition of each liquid crystal composition and the test results of its performance parameters are shown below.

[0115] Comparative Example 1

[0116] The liquid crystal composition of Comparative Example 1 was prepared according to the compounds and weight percentages listed in Table 1, and its performance was tested by filling it between the two substrates of a liquid crystal display. The test data are shown in the table below:

[0117] Table 1. Liquid crystal composition formulations and their test performance.

[0118]

[0119]

[0120] Example 1

[0121] The liquid crystal composition of Example 1 was prepared according to the compounds and weight percentages listed in Table 2, and its performance was tested by filling it between the two substrates of a liquid crystal display. The test data are shown in the table below:

[0122] Table 2 Liquid Crystal Composition Formulations and Test Performance

[0123]

[0124]

[0125] Example 2

[0126] The liquid crystal composition of Example 2 was prepared according to the compounds and weight percentages listed in Table 3, and its performance was tested by filling it between the two substrates of a liquid crystal display. The test data are shown in the table below:

[0127] Table 3. Liquid crystal composition formulations and their test performance.

[0128]

[0129]

[0130] Example 3

[0131] The liquid crystal composition of Example 3 was prepared according to the compounds and weight percentages listed in Table 4, and its performance was tested by filling it between the two substrates of a liquid crystal display. The test data are shown in the table below:

[0132] Table 4 Liquid Crystal Composition Formulations and Test Performance

[0133]

[0134]

[0135] Example 4

[0136] The liquid crystal composition of Example 4 was prepared according to the compounds and weight percentages listed in Table 5, and its performance was tested by filling it between the two substrates of a liquid crystal display. The test data are shown in the table below:

[0137] Table 5. Liquid Crystal Composition Formulations and Test Performance

[0138]

[0139]

[0140] Example 5

[0141] The liquid crystal composition of Example 5 was prepared according to the compounds and weight percentages listed in Table 6, and its performance was tested by filling it between the two substrates of a liquid crystal display. The test data are shown in the table below:

[0142] Table 6. Liquid Crystal Composition Formulations and Test Performance

[0143]

[0144]

[0145] Example 6

[0146] The liquid crystal composition of Example 6 was prepared according to the compounds and weight percentages listed in Table 7, and its performance was tested by filling it between the two substrates of a liquid crystal display. The test data are shown in the table below:

[0147] Table 7 Liquid Crystal Composition Formulations and Test Performance

[0148]

[0149]

[0150] Example 7

[0151] The liquid crystal composition of Example 7 was prepared according to the compounds and weight percentages listed in Table 8, and its performance was tested by filling it between the two substrates of a liquid crystal display. The test data are shown in the table below:

[0152] Table 8. Liquid Crystal Composition Formulations and Test Performance

[0153]

[0154]

[0155] Example 8

[0156] The liquid crystal composition of Example 8 was prepared according to the compounds and weight percentages listed in Table 9, and its performance was tested by filling it between the two substrates of a liquid crystal display. The test data are shown in the table below:

[0157] Table 9 Liquid Crystal Composition Formulations and Test Performance

[0158]

[0159]

[0160] Working principle:

[0161] As can be seen from the comparison between Comparative Example 1 and Example 1 above, the liquid crystal composition of the present invention has a higher voltage retention rate (VHR) while maintaining an appropriate clearing point, a large optical anisotropy and an appropriate dielectric anisotropy. The VHR-high temperature and VHR-UV data show that the liquid crystal composition of the present invention has excellent UV resistance and high temperature resistance, while also taking into account good low temperature performance.

[0162] As can be seen from Examples 1-8, the liquid crystal composition of the present invention, while maintaining a high clearing point and appropriate dielectric anisotropy, can have advantages such as high optical anisotropy, good low-temperature operating temperature, excellent UV resistance and high temperature resistance, and is suitable for various display and non-display optoelectronic components.

[0163] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0164] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A liquid crystal composition, characterized in that, Including compounds of general formula I: R1 represents a straight-chain, branched, or cyclic alkyl group containing 1 to 12 carbon atoms; R2, X1 to X11 each independently represent a straight-chain, branched, or cyclic alkyl group containing -H, halogen, or 1-12 carbon atoms, wherein one or more -CH2- atoms of the straight-chain, branched, or cyclic alkyl group containing 1-12 carbon atoms can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-, and one or more -H atoms can be independently replaced by -F or -Cl. Z1 and Z2 independently represent -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CF2O-, -OCF2-, -(CH2)n-, -CF2CH2-, -CH2CF2-, -(CF2)n-, -CH2CH2-CO-O-, -O-CO-CH2CH2-, -CR1 R2- or a single bond; n represents an integer from 0 to 2.

2. The liquid crystal composition according to claim 1, characterized in that: The liquid crystal compounds of general formula I mainly comprise, but are not limited to, the group consisting of compounds with the following complete structures: As mentioned above, -CF3 indicates -OCF3 indicates 3. The liquid crystal composition according to claim 1, characterized in that: The liquid crystal compound of general formula I must contain at least one compound of general formula I with Z1 or Z2 being -CF2O-.

4. A liquid crystal composition according to claim 3, characterized in that: The compound of general formula I accounts for 0.1% to 40% of the total weight of the liquid crystal composition.

5. A liquid crystal composition according to claim 3, characterized in that: The liquid crystal composition further comprises one or more compounds of general formula II. in, R3 represents -H, a straight-chain or branched alkyl group containing 1-12 carbon atoms. One or more non-adjacent -CH2- atoms in the straight-chain or branched alkyl group containing 1-12 carbon atoms can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-, and the straight-chain or branched alkyl group containing 1-12 carbon atoms... One or more -H can be independently replaced by -F or -Cl; L1, L2, and L3 each independently represent -H, alkyl groups containing 1 to 3 carbon atoms, or halogens; Y represents halogen, haloalkyl or haloalkoxy containing 1-5 carbon atoms, haloalkenyl or haloalkenoxy containing 2-5 carbon atoms, cyano or thiocyano. ring express in, One or more -CH2- bonds can be replaced by -O- bonds, and one or more single bonds in a ring can be replaced by double bonds; One or more -H can be replaced by -CN, -F or -Cl, and -CH= in one or more rings can be replaced by -N=; Z3 represents -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CF2O-, -OCF2-, -(CH2)n-, -CF2CH2-, -CH2CF2-, -(CF2)n-, -CH2CH2-CO-O-, -O-CO-CH2CH2-, -CR1 R2-, or a single bond. n represents an integer from 0 to 3.

6. A liquid crystal composition according to claim 5, characterized in that: The liquid crystal compounds of general formula II mainly include, but are not limited to, the group consisting of compounds with the following complete structures.

7. A liquid crystal composition according to claim 6, characterized in that: The compound of general formula I accounts for 0.5% to 35% of the total weight of the liquid crystal composition.

8. A liquid crystal composition according to claim 3, characterized in that: The liquid crystal composition further comprises one or more compounds of general formula A. in RA2 represents a straight-chain or branched alkyl group containing 1-12 carbon atoms. One or more non-adjacent -CH2- atoms in the straight-chain or branched alkyl group containing 1-12 carbon atoms can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-, and the straight-chain or branched alkyl group containing 1-12 carbon atoms... One or more -H can be independently replaced by -F or -Cl; ring and ring Each represents independently in, One or more -CH2- bonds can be replaced by -O- bonds, and one or more single bonds in a ring can be replaced by double bonds. One or more -H can be replaced by -CN, -F or -Cl, and -CH= in one or more rings can be replaced by -N=; ZA21 and ZA22 represent single bonds, -CH2CH2-, -CF2CF2-, -CO-O-, -O-CO-, -O-CO-O-, -CH=CH-, -CF=CF-, -CH2O-, or -OCH2-; LA21, LA22, LA23, LA24, and LA25 each independently represent -H, alkyl groups containing 1 to 3 carbon atoms, or halogens; XA2 represents halogen, haloalkyl or haloalkoxy containing 1-5 carbon atoms, haloalkenyl or haloalkenoxy containing 2-5 carbon atoms; At least one of LA21, LA22, and XA2 contains halogens.

9. A liquid crystal composition according to claim 6, characterized in that: The liquid crystal compounds of general formula II mainly include, but are not limited to, the group consisting of compounds with the following complete structures.

10. A liquid crystal composition according to claim 3, characterized in that: The liquid crystal composition may further comprise 0-5% by weight of a dopant, wherein the dopant is selected from the group consisting of antioxidants, ultraviolet absorbers, and polymerizable monomers, and the liquid crystal composition may further comprise one or more compounds of general formula M. in, RM1 indicates a straight-chain or branched alkyl group containing 1-12 carbon atoms. One or more non-adjacent -CH2- atoms in the straight-chain or branched alkyl group containing 1-12 carbon atoms can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-. RM2 represents halogen, straight-chain or branched alkyl groups containing 1-12 carbon atoms, One or more non-adjacent -CH2- atoms in the straight-chain or branched alkyl group containing 1-12 carbon atoms can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-. ring ring and ring Each represents independently in One or more of the -CH2- can be replaced by -O-. At most one -H in the halogen can be replaced by a halogen; ZM1 and ZM2 independently represent single bonds, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, -(CH2)4-, -CF2O-, -OCF2- or -CF2CF2-; nM1 represents 0, 1, 2, or 3, where when nM1 = 2 or 3, the ring... They can be the same or different; ZM2 can be the same or different. In some embodiments of the present invention, the compounds of general formula M are selected from the group consisting of the following compounds:

Images