Dye liquid crystal composition, liquid crystal dimming device containing dye liquid crystal composition and application of dye liquid crystal composition

Abstract

The invention provides a dye liquid crystal composition, a liquid crystal dimming device containing the dye liquid crystal composition and application of the dye liquid crystal composition. The dye liquid crystal composition comprises at least one liquid crystal composition A and at least one dichroic dye, wherein the liquid crystal composition A comprises at least one compound as shown in a general formula I. The dye liquid crystal composition disclosed by the invention has a relatively high clearing point, a relatively large dielectric anisotropy absolute value, a relatively low refractive index, relatively good low-temperature storage stability and relatively good low-temperature intersolubility; the liquid crystal dimming device containing the liquid crystal compound has good contrast, good transmittance, wide temperature application range, good stability and low dispersion, and the glare phenomenon in application scenes in the dimming fields of buildings, traffic and the like can be reduced.

Description

Technical Field

[0001] This invention belongs to the field of liquid crystal material technology, specifically relating to a dye liquid crystal composition, a liquid crystal dimming device containing the same, and their applications. Background Technology

[0002] Currently, liquid crystal dimming devices are increasingly widely used in the construction and transportation sectors. Conventional dimming solutions include PDLC (polymer dispersed liquid crystal), EC (electrochromic), and SPD (suspension particle). While each has its own advantages and disadvantages, their overall functionality cannot perfectly match market demands, thus limiting their widespread adoption. PDLC dimming glass is transparent when powered on and foggy when de-powered. This significant fogging limits its application scenarios, making it more suitable for conference room partitions than vehicle windows. EC (electrochromic) dimming works through a redox reaction, but its response speed is relatively slow (~5 min / m). 2 Furthermore, the larger the glass size, the slower the color change, and the more likely uneven color change will occur; SPD (suspended particle) dimming glass has a working voltage of up to 110V, which poses a safety risk and greatly limits its application in vehicle windows.

[0003] Dye-based liquid crystal dimming devices are fabricated using liquid crystal compositions doped with dichroic dyes. Driven by voltage, they can control the orientation of dye molecules to change transmittance, achieving continuous adjustment of brightness and darkness. Compared to other dimming solutions, dye-based liquid crystal dimming devices offer advantages such as low driving voltage, low power consumption, no haze, no viewing angle issues, fast response, diverse colors, and varied display capabilities. In applications, dye-based liquid crystal dimming devices are often referred to as smart windows, intelligent dimming elements, or switchable windows, and are receiving increasing attention in automotive, architectural, wearable device, and transparent display applications.

[0004] Many technical challenges remain to be addressed in dye-based liquid crystal dimming devices. For example, in applications with large cell thickness or multi-layer stacking, a lower refractive index is needed to reduce light scattering by the thick liquid crystal material, and lower dispersibility is required to minimize the impact of liquid crystal dispersion on the transmission spectrum and prevent glare. In practical applications such as automotive and construction, a higher clearing point is needed to achieve a wider liquid crystal phase. In applications requiring low-voltage drive, the liquid crystal material needs high dielectric anisotropy. Furthermore, considering long-term weather resistance, the dye in the liquid crystal material also needs good solubility, good solution stability, and good photothermal stability. Liquid crystal materials require high photostability, a large absolute value of dielectric anisotropy, a low refractive index, and low dispersibility; especially for dye-containing liquid crystal materials, the dichroic dyes also need to have high order. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a dye-based liquid crystal composition, a liquid crystal dimming device comprising the same, and their applications. The dye-based liquid crystal composition has a high clearing point, a large absolute value of dielectric anisotropy, a low refractive index, good low-temperature storage stability, and good low-temperature miscibility. This results in a liquid crystal dimming device comprising the same having good contrast, good transmittance, a wide operating temperature range, good stability, and low dispersion, enabling the liquid crystal dimming device to better reduce glare in dimming applications.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a dye liquid crystal composition comprising at least one liquid crystal composition A and at least one dichroic dye, wherein liquid crystal composition A comprises at least one compound of general formula I:

[0008]

[0009] in,

[0010] R1 and R2 each independently represent a straight-chain alkyl group containing 1-12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, or a branched alkyl group containing 3-12 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms. The -CH2- groups, one or more of the straight-chain alkyl group containing 1-12 carbon atoms and the branched alkyl group containing 3-12 carbon atoms, can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO- in a manner where the -O- atoms are not directly connected. At most one -H can be replaced by -F or -Cl;

[0011] ring and ring Each represents independently in One or more -CH2- can be replaced by -O-, and a single bond in one or at most two rings can be replaced by a double bond;

[0012] Z1 and Z2 independently represent single bonds, -CH2CH2-, -(CH2)3-, -(CH2)4-, -CF2CF2-, -CO-O-, -O-CO-, -O-CO-O-, -C≡C-, -CH=CH-, -CF=CF-, -CH2O-, -OCH2-, or -CF2O-;

[0013] n A1 and n A2 Each can independently represent 0, 1, or 2, where when n A1 When 2 is represented, the ring They can be the same or different, Z1 can be the same or different; when n A2 When 2 is represented, the ring They can be the same or different; Z2 can be the same or different.

[0014] In some embodiments of the invention, preferably, R1 and R2 each independently represent a straight-chain alkyl group containing 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms, a branched alkyl group containing 3-8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms, a straight-chain alkenyl group containing 2-8 (e.g., 2, 3, 4, 5, 6, 7 or 8) carbon atoms, or a branched alkenyl group containing 3-8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms.

[0015] In some embodiments of the present invention, the alkenyl group is preferably a group represented by any one of formulas (V1) to (V9), particularly preferably formulas (V1), (V2), (V8), or (V9). The groups represented by formulas (V1) to (V9) are as follows:

[0016] in," X "" indicates a carbon atom in the bonded ring structure.

[0017] In some embodiments of the present invention, preferably, Z1 and Z2 each independently represent a single bond, -CH2CH2-, -CO-O-, -CH=CH-, -CH2O-, or -OCH2-.

[0018] In some embodiments of the present invention, the compounds of general formula I are selected from the group consisting of the following compounds:

[0019] as well as

[0020]

[0021] In some embodiments of the present invention, in order to obtain a higher clearing point, a larger absolute value of dielectric anisotropy, a lower refractive index, better low-temperature storage stability, and better low-temperature miscibility, the compound of general formula I comprises at least one (e.g., two, three, four, or five) compounds selected from the group consisting of compounds of general formula I-1 and compounds of general formula I-7.

[0022] In some embodiments of the present invention, in order to obtain a higher clearing point, a larger absolute value of dielectric anisotropy, a lower refractive index, better low-temperature storage stability, and better low-temperature miscibility, the compound of general formula I comprises at least one (e.g., two, three, four, or five) compounds selected from the group consisting of the following compounds:

[0023] as well as

[0024]

[0025] In some embodiments of the present invention, in order to obtain a higher clearing point, a larger absolute value of dielectric anisotropy, a lower refractive index, better low-temperature storage stability, and better low-temperature miscibility, the compound of general formula I preferably contains at least one (e.g., two, three, four, or five) compounds selected from the group consisting of the following compounds:

[0026] as well as

[0027]

[0028] in,

[0029] R 11 It refers to a straight-chain alkyl group containing 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms, or a branched alkyl group containing 3 to 8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms;

[0030] R 12 It refers to a straight-chain alkenyl group containing 2-8 (e.g., 2, 3, 4, 5, 6, 7 or 8) carbon atoms, or a branched alkenyl group containing 3-8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms.

[0031] R2 represents a straight-chain alkyl group containing 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms, or a branched alkyl group containing 3-8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms.

[0032] In some embodiments of the present invention, it is preferable to adjust the content of the compound of general formula I so that the liquid crystal composition containing it has a higher clearing point, a larger absolute value of dielectric anisotropy, a lower refractive index, better low-temperature storage stability, and better low-temperature miscibility.

[0033] In some embodiments of the present invention, the compound of general formula I accounts for 0.1%-80% (inclusive of any value or subrange within this range) of the weight percentage of the liquid crystal composition A, for example, 0.1%, 1%, 3%, 4%, 6%, 8%, 9%, 10%, 12%, 14%, 16%, 18%, 20%, 21%, 22%, 24%, 26%, 27%, 28%, 30%, 31%, 32%, 34%, 36%, 37%, 38%, etc. The percentage of the compound of general formula I in the liquid crystal composition A is 40%, 41%, 42%, 44%, 46%, 48%, 50%, 51%, 52%, 54%, 56%, 58%, 60%, 61%, 62%, 64%, 65%, 66%, 67%, 68%, 70%, 71%, 72%, 74%, 75%, 76%, 78%, 79%, 80%, or any two of these values. Preferably, the compound of general formula I accounts for 5%-75% of the weight percentage of the liquid crystal composition A.

[0034] In some embodiments of the present invention, any one or a combination of at least two of the compounds of general formula I-1 and general formula I-7 constitute 1% to 75% (inclusive of any value or subrange within this range) of the weight of the liquid crystal composition A, for example, 1%, 2%, 3%, 4%, 5%, 7%, 8%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, or 30%. 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, 56%, 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, or a range between any two of these values.

[0035] In some embodiments of the present invention, any one or at least two combinations of compounds of general formula I-1-1, general formula I-1-2, general formula I-1-3, general formula I-7-1, general formula I-7-2, general formula I-7-3, general formula I-7-4, and general formula I-7-5 constitute 5% to 75% (inclusive of any value or subrange within this range) of the weight of the liquid crystal composition A, for example, 5%, 7%, 8%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, and 22%. 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, 56%, 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, or a range between any two of these values.

[0036] In some embodiments of the present invention, any one or at least two combinations of compounds of general formula I-1-1-1, general formula I-1-1-2, general formula I-7-1-1, and general formula I-7-1-2 constitute 5%-70% (inclusive of any value or subrange within this range) of the weight percentage of the liquid crystal composition A, for example, 5%, 7%, 8%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 2 5%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, 56%, 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, or a range between any two of these values.

[0037] In some embodiments of the present invention, the liquid crystal composition A accounts for 90%-99.3% (inclusive of any value or subrange within this range) of the weight of the dye liquid crystal composition, for example, 90%, 90.5%, 91%, 91.5%, 92%, 92.5%, 93%, 93.5%, 93.8%, 94%, 94.5%, 95%, 95.1%, 95.2%, 95.3%, 95.4%, 95.5%, 95.6%, 95.7%, 95.8%, 95.9%, 96%, 96.1%, 96.2%, 96.3%, 96.4%, 96.5%, etc. The percentage of liquid crystal composition A by weight is 96.6%, 96.7%, 96.8%, 96.9%, 97%, 97.1%, 97.2%, 97.3%, 97.4%, 97.5%, 97.6%, 97.7%, 97.8%, 97.9%, 98%, 98.1%, 98.2%, 98.3%, 98.4%, 98.5%, 98.6%, 98.7%, 98.8%, 98.9%, 99%, 99.1%, 99.2%, 99.3%, or a range between any two of these values. Preferably, the percentage of liquid crystal composition A in the dye liquid crystal composition is 93.5%-99.1%.

[0038] In some embodiments of the present invention, the dichroic dyes of the present invention are selected from any one or at least two (e.g., two, three, four or five) of the group consisting of azo dichroic dyes, anthraquinone dichroic dyes, phthalocyanine dichroic dyes, cyanine dichroic dyes, indigo dichroic dyes, methane dichroic dyes, nitro dichroic dyes and nitroso dichroic dyes.

[0039] In some embodiments of the present invention, the dichroic dye of the present invention is selected from any one or at least two (e.g., two, three, four or five) of the group consisting of azo dichroic dyes and anthraquinone dichroic dyes.

[0040] In some embodiments of the present invention, the dichroic dye of the present invention is selected from any one or a combination of at least two (e.g., two, three, four or five) of the following compounds:

[0041]

[0042]

[0043]

[0044]

[0045] In this invention, dichroic dyes exhibit different absorption characteristics in the visible spectrum due to their different structures. A single dichroic dye mainly absorbs light of a specific wavelength, displaying a color that is the complementary color of all transmitted light. However, it is difficult for a single dye to achieve black; therefore, multiple dyes need to be mixed to absorb light of multiple wavelengths. Then, based on the sensitivity of the human eye to light, uniform absorption in the visible light band is achieved to form black. For liquid crystal dimming devices containing dichroic dyes, the more uniform the absorption of different wavelengths of light by the liquid crystal composition in the visible light band, the better the display effect of the display device. Therefore, the appropriate ratio of multiple dichroic dyes needs to be selected.

[0046] In some embodiments of the present invention, the dichroic dyes of the present invention are selected from any one or at least two (e.g., two, three, four, or five) of the group consisting of a first type of dichroic dye, a second type of dichroic dye, and a third type of dichroic dye, wherein the first type of dichroic dye comprises at least one (e.g., two, three, four, or five) dichroic dye selected from the group consisting of blue dyes, blue-green dyes, and blue-violet dyes as described above (numbered 1-19); the second type of dichroic dye comprises at least one (e.g., two, three, four, or five) dichroic dye selected from the group consisting of purple dyes and magenta dyes as described above (numbered 20-27); and the third type of dichroic dye comprises at least one (e.g., two, three, or four) dichroic dye selected from the group consisting of orange-yellow dyes as described above (numbered 28-31).

[0047] In some embodiments of the present invention, the weight percentage ratio of the first type of dichroic dye, the second type of dichroic dye, and the third type of dichroic dye in the dichroic dye liquid crystal composition is (8-12):(1-4):(2-5) (inclusive of any value or subrange within this range), for example (8-11):(1-3):(2-4), (9-11):(2-4):(3-5), (8-10):(2-4):(3-4), (10-12):(1-3):(2-4), (10-12):(2-4):(3-5), (9-10):(1-3):(2-3), etc. Preferably, the weight percentage ratio of the first type of dichroic dye, the second type of dichroic dye, and the third type of dichroic dye in the dichroic dye liquid crystal composition is (10-12):(1-3):(2-4), and more preferably, it is 10:2:3.

[0048] In some embodiments of the present invention, the first type of dichroic dyes of the present invention includes any one or at least two (e.g., two, three, four or five) of the group consisting of dye No. 1, dye No. 2, dye No. 3, dye No. 5, dye No. 9 and dye No. 16.

[0049] In some embodiments of the present invention, the second type of dichroic dyes of the present invention include any one or at least two (e.g., two, three, four or five) of the group consisting of dye number 21, dye number 22, dye number 24, dye number 25 and dye number 27.

[0050] In some embodiments of the present invention, the third type of dichroic dyes of the present invention includes any one or at least two (e.g., two, three or four) of the group consisting of dyes numbered 28, 29, 30 and 31.

[0051] In some embodiments of the present invention, the dichroic dye of the present invention further comprises any one or a combination of at least two (e.g., two, three, four or five) of the following compounds:

[0052]

[0053]

[0054] In some embodiments of the present invention, the dichroic dye constitutes 0.01%-10% (inclusive of any value or subrange within this range) of the weight percentage of the dye liquid crystal composition, for example, 0.01%, 0.05%, 0.1%, 0.5%, 1%, 1.2%, 1.4%, 1.5%, 1.8%, 1.9%, 2%, 2.2%, 2.4%, 2.5%, 2.6%, 2.8%, 3%, 3.2%, 3.5%, 3.6%, 3.8%, 4%, 4.2%, 4.4%. The percentages are 4.6%, 4.8%, 5%, 5.2%, 5.4%, 5.6%, 5.8%, 6%, 6.2%, 6.4%, 6.6%, 6.8%, 7%, 7.2%, 7.4%, 7.6%, 7.8%, 8%, 8.2%, 8.4%, 8.6%, 8.8%, 9%, 9.2%, 9.4%, 9.6%, 9.8%, 10%, or any two of these values. Preferably, the dichroic dye constitutes 0.01%-7% of the weight of the dye liquid crystal composition.

[0055] In some embodiments of the present invention, the first type of dichroic dye accounts for 0.01%-5% (inclusive of any value or subrange within this range) of the weight percentage of the dye liquid crystal composition, for example, 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, 2.1%, 2.2%, 2 The percentage of the first type of dichroic dye in the dye liquid crystal composition is 0.01% to 3.5% by weight. The values ​​are 0.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3%, 3.1%, 3.2%, 3.3%, 3.4%, 3.5%, 3.6%, 3.7%, 3.8%, 3.9%, 4%, 4.1%, 4.2%, 4.3%, 4.4%, 4.5%, 4.6%, 4.7%, 4.8%, 4.9%, 5%, or any two of these values. Preferably, the first type of dichroic dye accounts for 0.01% to 3.5% of the weight of the dye liquid crystal composition.

[0056] In some embodiments of the present invention, the first type of dichroic dye, consisting of any one or at least two of the dyes numbered 1, 2, 3, 5, 9, and 16, constitutes 0.05% to 3% by weight of the dye liquid crystal composition (inclusive of any value or subrange within this range), for example, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3%, or a range between any two of these values.

[0057] In some embodiments of the present invention, the second type of dichroic dye accounts for 0.01%-3% (inclusive of any value or subrange within this range) of the dye liquid crystal composition, for example, 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3%, or a range between any two of these values. Preferably, the second type of dichroic dye accounts for 0.01%-1.5% of the weight of the dye liquid crystal composition.

[0058] In some embodiments of the invention, the second type dichroic dye, consisting of any one or at least two of the dyes numbered 21, 22, 24, 25, and 27, constitutes 0.05% to 1% by weight of the dye liquid crystal composition (inclusive of any value or subrange within this range), for example, 0.05%, 0.1%, 0.2%, 0.3%, 0.35%, 0.4%, 0.45%, 0.5%, 0.55%, 0.6%, 0.65%, 0.7%, 0.75%, 0.8%, 0.85%, 0.9%, 0.95%, 1%, or a range between any two of these values.

[0059] In some embodiments of the present invention, the third type of dichroic dye accounts for 0.01%-3% (inclusive of any value or subrange within this range) of the dye liquid crystal composition, for example, 0.01%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3%, or a range between any two of these values. Preferably, the third type of dichroic dye accounts for 0.01%-1.5% of the weight of the dye liquid crystal composition.

[0060] In some embodiments of the present invention, the weight percentage of any one or at least two of the third-class dichroic dyes from the group consisting of dyes numbered 28, 29, 30, and 31 of the dye liquid crystal composition is 0.05% to 1.5% (inclusive of any value or subrange within this range), for example, 0.05%, 0.1%, 0.2%, 0.3%, 0.35%, 0.4%, 0.45%, 0.5%, 0.55%, 0.6%, 0.65%, 0.7%, 0.75%, 0.8%, 0.85%, 0.9%, 0.95%, 1%, 1.05%, 1.1%, 1.15%, 1.2%, 1.25%, 1.3%, 1.35%, 1.4%, 1.45%, 1.5%, or any two of these values.

[0061] In some embodiments of the present invention, the liquid crystal composition A of the present invention further comprises at least one compound of general formula II:

[0062]

[0063] in,

[0064] R P1 and R P2 Each of these terms independently represents a straight-chain alkyl group containing 1-12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, or a branched alkyl group containing 3-12 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms. One or more non-adjacent -CH2- groups of the straight-chain alkyl group containing 1-12 carbon atoms and the branched alkyl group containing 3-12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-;

[0065] ring and ring Each represents independently in One or more -CH2- bonds can be replaced by -O- bonds, and single bonds in one or at most two rings can be replaced by double bonds. At most one -H in the halogen can be replaced by a halogen;

[0066] Z P1 This indicates -CO-O-, -O-CO-, -O-CO-O-, -CF2O-, -CH2O-, or -OCH2-;

[0067] n P1 and n P2 Each can independently represent 0, 1, or 2.

[0068] In some embodiments of the present invention, preferably, R P1 and R P2 Each of these terms independently represents a straight-chain alkyl group containing 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched alkyl group containing 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms, a straight-chain alkoxy group containing 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched alkoxy group containing 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms, a straight-chain alkenyl group containing 2-8 (e.g., 2, 3, 4, 5, 6, 7, or 8) carbon atoms, or a branched alkenyl group containing 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms. More preferably, R P1 and R P2 Each can be independently represented as a straight-chain alkyl group containing 1-5 carbon atoms or a branched alkyl group containing 3-5 carbon atoms.

[0069] In some embodiments of the present invention, preferably, the ring and ring Each represents independently

[0070] In some embodiments of the present invention, preferably, Z P1 It represents -CO-O-, -CH2O-, or -OCH2-.

[0071] In some embodiments of the present invention, preferably, 1≤n P1 +n P2 ≤3.

[0072] In some embodiments of the present invention, the compounds of general formula II are selected from the group consisting of the following compounds:

[0073]

[0074] as well as

[0075]

[0076] In some embodiments of the present invention, in order to obtain a higher clearing point, a larger absolute value of dielectric anisotropy, a lower refractive index, better low-temperature storage stability, and better low-temperature miscibility, the compound of general formula II comprises at least one (e.g., two, three, four, or five) compounds selected from the group consisting of compounds of general formula II-1, compounds of general formula II-6, compounds of general formula II-11, and compounds of general formula II-12.

[0077] In some embodiments of the present invention, it is preferable to adjust the content of the compound of general formula II so that the liquid crystal composition containing it has a higher clearing point, a larger absolute value of dielectric anisotropy, a lower refractive index, better low-temperature storage stability, and better low-temperature miscibility.

[0078] In some embodiments of the invention, the compound of general formula II accounts for 0.1%-60% (inclusive of any value or subrange within this range) of the weight percentage of the liquid crystal composition A, for example, 0.1%, 1%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, etc. The percentage of the compound of general formula II in the liquid crystal composition A is 28%, 29%, 30%, 31%, 32%, 34%, 35%, 36%, 37%, 38%, 40%, 41%, 42%, 43%, 44%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, 56%, 58%, 59%, 60%, or any two of these values. Preferably, the compound of general formula II accounts for 0.1% to 30% of the weight percentage of the liquid crystal composition A.

[0079] In some embodiments of the invention, any one or at least two of the compounds of formula II-1, formula II-6, formula II-11, and formula II-12 constitute 0.1% to 25% (inclusive of any value or subrange within this range) of the weight of the liquid crystal composition A, for example, 0.1%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, or a range between any two of these values.

[0080] In some embodiments of the present invention, the liquid crystal composition A of the present invention further comprises at least one compound of general formula M:

[0081]

[0082] in,

[0083] R M1 and R M2 Each of these terms independently represents a straight-chain alkyl group containing 1-12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, or a branched alkyl group containing 3-12 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms. One or more non-adjacent -CH2- groups of the straight-chain alkyl group containing 1-12 carbon atoms and the branched alkyl group containing 3-12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-;

[0084] ring ring and ring Each represents independently in One or more -CH2- bonds can be replaced by -O- bonds, and single bonds in one or at most two rings can be replaced by double bonds. At most one -H in the halogen can be replaced by a halogen;

[0085] Z M1 and Z M2 Each can independently represent a single bond, -CH2CH2-, -C≡C-, -CH=CH-, -(CH2)3-, or -(CH2)4-; and

[0086] n M Represents 0, 1, or 2, where when n M When 2 is represented, the ring They can be the same or different, Z M2 They can be the same or different.

[0087] In some embodiments of the present invention, preferably, R M1 and R M2 Each of these terms independently represents a straight-chain alkyl group containing 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched alkyl group containing 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms, a straight-chain alkoxy group containing 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched alkoxy group containing 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms, a straight-chain alkenyl group containing 2-8 (e.g., 2, 3, 4, 5, 6, 7, or 8) carbon atoms, or a branched alkenyl group containing 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms.

[0088] In some embodiments of the present invention, preferably, R M1 and R M2 One of them is a straight-chain alkoxy group containing 1-8 carbon atoms, a straight-chain alkenyl group containing 2-8 carbon atoms, a branched alkenyl group containing 3-8 carbon atoms, or a branched alkoxy group containing 3-8 carbon atoms, while the other is a straight-chain alkyl group containing 1-8 carbon atoms, or a branched alkyl group containing 3-8 carbon atoms.

[0089] In some embodiments of the present invention, the compounds of general formula M are selected from the group consisting of the following compounds:

[0090]

[0091]

[0092] as well as

[0093]

[0094] In some embodiments of the present invention, in order to obtain a higher clearing point, a larger absolute value of dielectric anisotropy, a lower refractive index, better low-temperature storage stability, and better low-temperature miscibility, the compound of general formula M comprises at least one (e.g., two, three, four, or five) compounds selected from the group consisting of compounds of general formula M-1, compounds of general formula M-2, and compounds of general formula M-12.

[0095] In some embodiments of the present invention, in order to obtain a higher clearing point, a larger absolute value of dielectric anisotropy, a lower refractive index, better low-temperature storage stability, and better low-temperature miscibility, the compound of general formula M comprises at least one (e.g., two, three, four, or five) compounds selected from the group consisting of the following compounds:

[0096]

[0097] as well as

[0098]

[0099] in,

[0100] R M1 and R M2 Each of these terms independently represents a straight-chain alkyl group containing 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, or a branched alkyl group containing 3 to 8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms.

[0101] R M11 and R M21 Each can be independently represented as a straight-chain alkenyl group containing 2-8 (e.g., 2, 3, 4, 5, 6, 7 or 8) carbon atoms, or a branched alkenyl group containing 3-8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms.

[0102] R M22 It refers to a straight-chain alkoxy group containing 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms, or a branched-chain alkoxy group containing 3 to 8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms.

[0103] In some embodiments of the present invention, it is preferable to adjust the content of the compound of general formula M so that the liquid crystal composition containing it has a higher clearing point, a larger absolute value of dielectric anisotropy, a lower refractive index, better low-temperature storage stability, and better low-temperature miscibility.

[0104] In some embodiments of the invention, the compound of general formula M accounts for 0.1%-60% (inclusive of any value or subrange within this range) of the liquid crystal composition A, for example, 0.1%, 1%, 3%, 5%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 17%, 18%, 20%, 22%, 23%, 24%, 25%, 27%, 28%, 30%, 31%, 32%, 33%, 35%, 37%, 38%, 40%, 42%, 44%, 45%, 46%, 48%, 50%, 52%, 55%, 56%, 58%, 60%, or a range between any two of these values. Preferably, the compound of general formula M accounts for 0.1%-40% of the liquid crystal composition A by weight.

[0105] In some embodiments of the invention, any one or at least two combinations of compounds of formula M-1, formula M-2, and formula M-12 constitute 0.1% to 40% by weight of the liquid crystal composition A (inclusive of any value or subrange within this range), for example, 0.1%, 0.5%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, or a range between any two of these values.

[0106] In some embodiments of the present invention, any one or at least two combinations of compounds of general formula M-1-1, general formula M-1-3, general formula M-1-4, general formula M-2-2, general formula M-12-1, and general formula M-12-3 constitute 1% to 40% (inclusive of any value or subrange within this range) of the weight of the liquid crystal composition A, for example, 1%, 2%, 3%, 4%, etc. 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, or a range between any two of these values.

[0107] In some embodiments of the present invention, the liquid crystal composition A of the present invention further comprises at least one compound of general formula III:

[0108]

[0109] in,

[0110] R3 and R4 each independently represent a straight-chain alkyl group containing 1-12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, or a branched alkyl group containing 3-12 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms. One or more non-adjacent -CH2- groups of the straight-chain alkyl group containing 1-12 carbon atoms or the branched alkyl group containing 3-12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -CO-O-, or -O-CO-, and at most one -H group of the aforementioned groups may be replaced by -F or -Cl.

[0111] ring and ring Each represents independently in One or more -CH2- can be replaced by -O-, and a single bond in one or at most two rings can be replaced by a double bond;

[0112] Z3 and Z4 independently represent single bonds, -CH2CH2-, -(CH2)3-, -(CH2)4-, -CF2CF2-, -CO-O-, -O-CO-, -O-CO-O-, -C≡C-, -CH=CH-, -CF=CF-, -CH2O-, -OCH2-, or -CF2O-;

[0113] n B1 and n B2 Each can independently represent 0, 1, or 2, where when n B1 When 2 is represented, the ring They can be the same or different, Z3 can be the same or different; when n B2 When 2 is represented, the ring They can be the same or different; Z4 can be the same or different.

[0114] In some embodiments of the invention, preferably, R3 and R4 each independently represent a straight-chain alkyl group containing 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms, a branched alkyl group containing 3-8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms, a straight-chain alkenyl group containing 2-8 (e.g., 2, 3, 4, 5, 6, 7 or 8) carbon atoms, or a branched alkenyl group containing 3-8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms.

[0115] In some embodiments of the present invention, the compounds of general formula III are selected from the group consisting of the following compounds:

[0116]

[0117] as well as

[0118] In some embodiments of the present invention, preferably, Z3 represents a single bond, -CH2CH2- or -CH=CH-.

[0119] In some embodiments of the present invention, preferably, Z4 represents a single bond, -CH2CH2-, -CO-O-, or -CH2O-.

[0120] In some embodiments of the present invention, in order to obtain a higher clearing point, a larger absolute value of dielectric anisotropy, a lower refractive index, better low-temperature storage stability, and better low-temperature miscibility, the compound of general formula III comprises at least one (e.g., two, three, four, or five) compounds selected from the group consisting of compounds of general formula III-1 and compounds of general formula III-7.

[0121] In some embodiments of the present invention, in order to obtain a higher clearing point, a larger absolute value of dielectric anisotropy, a lower refractive index, better low-temperature storage stability, and better low-temperature miscibility, the compound of general formula III comprises at least one (e.g., two, three, four, or five) compounds selected from the group consisting of the following compounds:

[0122]

[0123]

[0124] Among them, R 31 It refers to a straight-chain alkyl group containing 1 to 8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms, or a branched alkyl group containing 3 to 8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms;

[0125] R 32 It refers to a straight-chain alkenyl group containing 2-8 (e.g., 2, 3, 4, 5, 6, 7 or 8) carbon atoms, or a branched alkenyl group containing 3-8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms.

[0126] R4 represents a straight-chain alkyl group containing 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms, or a branched alkyl group containing 3-8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms.

[0127] In some embodiments of the present invention, the content of the compound of general formula III is preferably adjusted so that the liquid crystal composition containing it has a higher clearing point, a larger absolute value of dielectric anisotropy, a lower refractive index, better low-temperature storage stability, and better low-temperature miscibility.

[0128] In some embodiments of the invention, the compound of general formula III accounts for 0.1%-60% (inclusive of any value or subrange within this range) of the liquid crystal composition A by weight, for example, 0.1%, 1%, 3%, 4%, 6%, 8%, 9%, 10%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, etc. The percentage of the compound of general formula III in the liquid crystal composition A is 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 44%, 46%, 48%, 50%, 51%, 52%, 54%, 56%, 58%, 60%, or any two of these values. Preferably, the compound of general formula III accounts for 5%-45% of the weight percentage of the liquid crystal composition A.

[0129] In some embodiments of the invention, any one or a combination of at least two of the compounds of general formula III-1 and general formula III-7 constitutes 5% to 45% by weight of the liquid crystal composition (inclusive of any value or subrange within this range), for example, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, or a range between any two of these values.

[0130] In some embodiments of the invention, any one or at least two of the compounds of formula III-1-1, formula III-1-2, formula III-7-1, and formula III-7-2 constitute 5% to 40% by weight of the liquid crystal composition (inclusive of any value or subrange within this range), for example, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, or a range between any two of these values.

[0131] In some embodiments of the present invention, the liquid crystal composition A of the present invention further comprises at least one compound of general formula N:

[0132]

[0133] in,

[0134] R E1 and R E2 Each of these terms independently represents a straight-chain alkyl group containing 1-12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, or a branched alkyl group containing 3-12 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms. One or more non-adjacent -CH2- groups of straight-chain alkyl groups containing 1-12 carbon atoms or branched alkyl groups containing 3-12 carbon atoms can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-.

[0135] ring and ring Each represents independently The above 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 -F, -Cl, or -CN, and one or more -CH= in a ring can be replaced by -N=;

[0136] Z E1 and Z E2 Each can independently represent a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, -CF2CF2-, -(CH2)4-, -CF2O-, or -OCF2-;

[0137] L E1 and L E2 Each independently represents -H, halogen, alkyl group containing 1-3 (e.g., 1, 2, or 3) carbon atoms, or alkoxy group containing 1-3 (e.g., 1, 2, or 3) carbon atoms; and,

[0138] n E1 n represents 0, 1, 2, or 3. E2 Represents 0 or 1, and 0 ≤ n E1 +n E2 ≤3; when n E1 When representing 2 or 3, the ring Same or different, Z E1 Same or different.

[0139] In some embodiments of the present invention, preferably, R E1 and R E2 Each of these terms independently represents a straight-chain alkyl group containing 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched alkyl group containing 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms, a straight-chain alkoxy group containing 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched alkoxy group containing 3-8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a straight-chain alkenyl group containing 2-8 (e.g., 2, 3, 4, 5, 6, 7, or 8) carbon atoms, or a branched alkenyl group containing 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms.

[0140] In some embodiments of the present invention, preferably, L E1 and L E2 Both represent -H.

[0141] In some embodiments of the present invention, compounds of general formula N are selected from the group consisting of the following compounds:

[0142]

[0143]

[0144]

[0145] as well as

[0146]

[0147] In some embodiments of the present invention, in order to obtain a higher clearing point, a larger absolute value of dielectric anisotropy, a lower refractive index, better low-temperature storage stability, and better low-temperature miscibility, the compound of general formula N includes at least one (e.g., two, three, four, or five) compounds selected from the group consisting of compounds of general formula N-2, general formula N-3, general formula N-9, and general formula N-13.

[0148] In some embodiments of the present invention, it is preferable to adjust the content of the compound of general formula N so that the liquid crystal composition containing it has a higher clearing point, a larger absolute value of dielectric anisotropy, a lower refractive index, better low-temperature storage stability, and better low-temperature miscibility.

[0149] In some embodiments of the invention, the compound of general formula N accounts for 0.1%-40% (inclusive of any value or subrange within this range) of the liquid crystal composition A, for example, 0.1%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, or a range between any two of these values. Preferably, the compound of general formula N accounts for 0.1%-30% of the liquid crystal composition A by weight.

[0150] In some embodiments of the invention, any one or at least two combinations of compounds of general formula N-2, general formula N-3, general formula N-9, and general formula N-13 constitute 1% to 25% (inclusive of any value or subrange within this range) of the weight of the liquid crystal composition A, for example, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, or a range between any two of these values.

[0151] In some embodiments of the present invention, the liquid crystal composition A of the present invention further comprises at least one compound of general formula F:

[0152]

[0153] in,

[0154] R F1 and R F2 Each of these can independently represent -H, halogen, straight-chain alkyl group containing 1-12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, or branched alkyl group containing 3-12 (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms. Among them are straight-chain alkyl groups containing 1-12 carbon atoms, and branched alkyl groups containing 3-12 carbon atoms. One or more non-adjacent -CH2- can be independently replaced by -CH=CH-, -C≡C-, -O-, -S-, -CO-, -CO-O-, or -O-CO-, and one or more -H in a straight-chain alkyl group containing 1-12 carbon atoms or a branched alkyl group containing 3-12 carbon atoms can be independently replaced by -F or -Cl;

[0155] ring and ring Each represents independently in One or more non-adjacent -CH2- bonds can be replaced by -O- bonds, and at most two single bonds in one or more non-adjacent rings can be replaced by double bonds, wherein... One or more -H can be independently replaced by -CN, -F or -Cl, and -CH= in one or more rings can be replaced by -N=;

[0156] X F Indicates -O-, -S-, or -CO-;

[0157] LF1 and L F2 Each can be independently represented as -H, -F, -Cl, -CF3, or -OCF3;

[0158] Z F1 and Z F2 Each can independently represent a single bond, -O-, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -(CH2)2O-, -O(CH2)2-, -CH=CH-, -C≡C-, -CH2CH2-, -CF2CF2-, -(CH2)3-, -(CH2)4-, -CF2O-, or -OCF2-;

[0159] n F1 and n F2 Each can independently represent 0, 1, or 2, where when n F1 When 2 is represented, the ring They can be the same or different, where when n F2 When 2 is represented, the ring They can be the same or different, Z F2 They can be the same or different; and

[0160] n F4 Represents an integer between 0 and 4 (e.g., 0, 1, 2, 3, or 4).

[0161] In some embodiments of the present invention, compounds of general formula F are selected from the group consisting of the following compounds:

[0162]

[0163]

[0164]

[0165] as well as

[0166]

[0167] in,

[0168] R F1 and R F2Each of the following can independently represent -H, halogen, a straight-chain alkyl group containing 1-10 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10) carbon atoms, or a branched alkyl group containing 3-10 (e.g., 3, 4, 5, 6, 7, 8, 9, or 10) carbon atoms, wherein one or more of the straight-chain alkyl group containing 1-10 carbon atoms or the branched alkyl group containing 3-10 carbon atoms can be independently replaced by -C≡C-, -O-, -S-, -CO-, -CO-O-, or -O-CO-, and one or more of the -H groups in the straight-chain alkyl group containing 1-10 carbon atoms or the branched alkyl group containing 3-10 carbon atoms can be independently replaced by -F or -Cl;

[0169] Z F1 It represents a single bond, -O-, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, -CF2CF2-, -(CH2)4-, -CF2O-, or -OCF2-;

[0170] R F2 ' indicates a straight-chain alkoxy group containing 1-11 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or 11) carbon atoms or a branched-chain alkoxy group containing 3-11 (e.g., 3, 4, 5, 6, 7, 8, 9, 10 or 11) carbon atoms;

[0171] X F1 and X F2 Each can be represented independently as -CH2- or -O-;

[0172] n F3 Integers representing 1-5 (e.g., 1, 2, 3, 4, or 5); and

[0173] R F3 The term refers to a straight-chain alkyl group containing 1-5 (e.g., 1, 2, 3, 4, or 5) carbon atoms, a branched alkyl group containing 3-5 (e.g., 3, 4, or 5) carbon atoms, a straight-chain alkoxy group containing 1-5 (e.g., 1, 2, 3, 4, or 5) carbon atoms, a branched alkoxy group containing 3-5 (e.g., 3, 4, or 5) carbon atoms, a straight-chain alkenyl group containing 2-5 carbon atoms, or a branched alkenyl group containing 3-5 (e.g., 3, 4, or 5) carbon atoms.

[0174] In some embodiments of the present invention, it is preferable to adjust the content of the compound of general formula F so that the liquid crystal composition containing it has a higher clearing point, a larger absolute value of dielectric anisotropy, a lower refractive index, better low-temperature storage stability, and better low-temperature miscibility.

[0175] In some embodiments of the present invention, the compound of general formula F accounts for 0.1%-50% (inclusive of any value or subrange within this range) of the liquid crystal composition A by weight, for example, 0.1%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 2 4%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, or a range between any two of these values, preferably, the compound of general formula N accounts for 1%-40% of the weight percentage of the liquid crystal composition A.

[0176] In some embodiments of the present invention, the dye liquid crystal composition of the present invention further comprises at least one chiral agent, wherein the chiral agent is selected from any one or a combination of at least two (e.g., two, three, four or five) of the following compounds:

[0177]

[0178] as well as

[0179]

[0180] In this context, * indicates a chiral site.

[0181] In some embodiments of the present invention, in order to obtain a higher clearing point, a larger absolute value of dielectric anisotropy, a lower refractive index, better low-temperature storage stability, and better low-temperature miscibility, the chiral agent of the present invention comprises at least one chiral agent selected from the group consisting of chiral agents of general formula R / S-811, general formula R / S-5011, general formula R / S-2011, general formula R / S-6N, and general formula CB 15.

[0182] In some embodiments of the invention, the chiral agent constitutes 0.01%-10% (inclusive of any value or subrange within this range) of the weight percentage of the dye liquid crystal composition, for example, 0.01%, 0.05%, 0.1%, 0.15%, 0.2%, 0.25%, 0.3%, 0.35%, 0.4%, 0.45%, 0.5%, 0.55%, 0.6%, 0.65%, 0.7%, 0.75%, 0.8%, 0.85%, 0.9%, 0.95%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, 2%. The chiral agent comprises 1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3%, 3.2%, 3.4%, 3.6%, 3.8%, 4%, 4.2%, 4.4%, 4.6%, 4.8%, 5%, 5.2%, 5.5%, 5.8%, 6%, 6.2%, 6.5%, 6.8%, 7%, 7.2%, 7.5%, 7.8%, 8%, 8.2%, 8.5%, 8.8%, 9%, 9.2%, 9.5%, 9.8%, 10%, or a range between any two of these values. Preferably, the chiral agent constitutes 0.01%-4% of the weight percentage of the dye liquid crystal composition.

[0183] In this invention, "can be replaced by... independently" means that it can be replaced or not, that is, being replaced or not being replaced both fall within the protection scope of this invention; the same applies to "can be replaced by... independently"; moreover, the positions of "replace" and "substitute" are arbitrary.

[0184] In this invention, short straight lines on one or both sides of a group represent an access bond, not a methyl group (e.g., methyl groups). The short line on the left and (The short straight lines on both sides).

[0185] In this invention, halogens include halogen elements such as fluorine, chlorine, bromine, or iodine; the same descriptions used below have the same meaning.

[0186] In this invention, halogenation means that at least one hydrogen atom in the group is replaced by a halogen (fluorine, chlorine, bromine or iodine, etc.).

[0187] In this invention, the numerical range involved in defining the number of carbon atoms in the group refers to the number of carbon atoms being any of the selectable integers within the defined range. For example, the number of carbon atoms from 1 to 10 can be 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10, and so on.

[0188] In the dye liquid crystal composition provided by the present invention, the compound of general formula I and the dichroic dye are compounded with each other through specific structure and content. The dye liquid crystal composition containing the compound has a higher clearing point, a larger absolute value of dielectric anisotropy, a lower refractive index, better low temperature storage stability and better low temperature miscibility, and also has a wider phase width to meet more application requirements.

[0189] In some embodiments of the present invention, the dye liquid crystal composition of the present invention further includes additives such as antioxidants, light stabilizers, and ultraviolet absorbers.

[0190] In some embodiments of the present invention, the additives such as antioxidants, light stabilizers, and ultraviolet absorbers preferably contain the following substances:

[0191]

[0192]

[0193]

[0194] Where n represents a positive integer from 1 to 12, and n² represents a positive integer from 3 to 5. + It represents a free radical.

[0195] In some embodiments of the present invention, the additive of the present invention accounts for 0.01%-5% (inclusive of any value or subrange within this range) of the weight percentage of the dye liquid crystal composition, for example, 0.01%, 0.05%, 0.08%, 0.1%, 0.3%, 0.5%, 0.8%, 1%, 2%, 3%, 4% or 5%; preferably, the additive accounts for 0.01%-1% of the weight percentage of the dye liquid crystal composition.

[0196] Secondly, the present invention provides a liquid crystal dimming device comprising the dye-liquid crystal composition described in the first aspect. The liquid crystal device of the present invention is preferably adapted to regulate the transfer of energy in the form of sunlight from the environment to an interior space. The energy transfer to be regulated here occurs from the environment (i.e., the external space) to the interior space.

[0197] Interior space here can be any desired space that is substantially isolated from the environment, such as a building, vehicle, or container.

[0198] The liquid crystal dimming device of the present invention can also be used to adjust the incident light on the eyes in devices such as sun visors, sunglasses or goggles, wherein the device keeps the incident light on the eyes low in one switching state and reduces the incident light to a smaller extent in another switching state.

[0199] The liquid crystal dimming device described in this invention is preferably suitable for controlling the energy of sunlight as it passes from the environment into the interior space, and can be applied in the fields of architecture, transportation, or containers.

[0200] The liquid crystal dimming device described in this invention is switchable. Switching here refers to changing the flow of energy through the device. Preferably, the liquid crystal dimming device of this invention is electrically switchable. However, the device can also be thermally switchable.

[0201] In the case where the liquid crystal dimming device described in this invention is electrically switchable, the switching operation is performed by applying voltage to (re)align the liquid crystal material.

[0202] In some embodiments of the present invention, the liquid crystal dimming device cell is a negative liquid crystal cell.

[0203] In some embodiments of the present invention, the liquid crystal dimming device is transformed from a state having low absorptivity (i.e., high transmittance) (present under no voltage) to a state having higher absorptivity (i.e., lower transmittance) (present under applied voltage). The liquid crystal material of the switching layer is preferably nematic in both states. The no-voltage state is preferably characterized by the liquid crystal material of the switching layer being aligned perpendicular to the plane of the switching layer. The applied-voltage state is preferably characterized by the liquid crystal material of the switching layer being aligned parallel to the plane of the switching layer.

[0204] The liquid crystal dimming device of the present invention comprises at least one layer (e.g., two layers, three layers, or four layers) of liquid crystal cells, such as single cell, double cell stacked, triple cell stacked, or quad cell stacked.

[0205] In some embodiments of the present invention, the liquid crystal dimming device of the present invention preferably adopts a single cell or a double cell stacking scheme.

[0206] In some embodiments of the present invention, the single-cell liquid crystal dimming device of the present invention comprises, from bottom to top, a first transparent substrate, a first conductive layer, a first alignment layer, a dye liquid crystal material layer, a second alignment layer, a second conductive layer, and a second transparent substrate, wherein the friction directions of the first alignment layer and the second alignment layer are parallel.

[0207] In some embodiments of the present invention, the dual-cell liquid crystal dimming device of the present invention includes a first liquid crystal device cell and a second liquid crystal device cell, which are arranged from bottom to top as the first liquid crystal device cell and the second liquid crystal device cell; wherein the first liquid crystal device cell includes, from bottom to top, a first transparent substrate, a first conductive layer, a first alignment layer, a first dye liquid crystal material layer, a second alignment layer, a second conductive layer and a second transparent substrate, and the friction directions of the first alignment layer and the second alignment layer are parallel; the second liquid crystal device cell includes, from bottom to top, a third transparent substrate, a third conductive layer, a third alignment layer, a second dye liquid crystal material layer, a fourth alignment layer, a fourth conductive layer and a fourth transparent substrate, and the friction directions of the third alignment layer and the fourth alignment layer are parallel.

[0208] In some embodiments of the present invention, in the dual-cell liquid crystal dimming device of the present invention, the positional relationship between the first liquid crystal cell and the second liquid crystal cell is as follows: the second liquid crystal cell is located above the first liquid crystal cell, and the friction directions of the first liquid crystal cell and the second liquid crystal cell are perpendicular to each other.

[0209] The liquid crystal device of the present invention, wherein the dye liquid crystal material layer comprises the dye liquid crystal composition as described in the first aspect.

[0210] In some embodiments of the present invention, the thickness of the dye liquid crystal material layer of the present invention is in the range of 2μm-12μm (inclusive of any value or subrange within this range), for example, 2μm, 3μm, 4μm, 5μm, 6μm, 7μm, 8μm, 9μm, 10μm, 11μm, 12μm. Preferably, the thickness of the dye liquid crystal material layer is in the range of 3μm-10μm.

[0211] In some embodiments of the present invention, the first alignment layer, the second alignment layer, the third alignment layer and the fourth alignment layer in the liquid crystal device of the present invention are all preferably polyimide layers, wherein the first conductive layer, the second conductive layer, the third conductive layer and the fourth conductive layer are all preferably ITO conductive layers.

[0212] In some embodiments of the present invention, the polyimide layers of the first alignment layer, the second alignment layer, the third alignment layer, and the fourth alignment layer in the liquid crystal device of the present invention are vertically aligned.

[0213] Based on the principle that dichroic dye compounds have higher or lower absorption coefficients according to their alignment with the polarization plane of light, the difference between the ordered and disordered existence of dichroic dye compounds causes the difference in transmittance of the switching layer of the device according to the present invention.

[0214] In the liquid crystal device of the present invention, under the guidance of the alignment layer, the dye liquid crystal material is arranged perpendicular to the upper and lower substrates in the unenergized state, and incident light can pass through, thus presenting a transparent state; in the energized state, the dye liquid crystal material is arranged in an inverted spiral, and the dichroic dye molecules absorb the incident light, presenting a dark state, thereby achieving the modulation of the incident light.

[0215] In some embodiments of the present invention, the liquid crystal device is preferably used in applications with a large cell thickness or multiple cells stacked together.

[0216] Thirdly, the present invention provides an application of a liquid crystal dimming device.

[0217] In some embodiments of the present invention, the present invention provides an application of a liquid crystal dimming device for dimming in the fields of architecture and transportation.

[0218] Compared with the prior art, the present invention has the following beneficial effects:

[0219] The dye liquid crystal composition provided by this invention, through the mutual compounding of specific structures and contents of compounds, enables it to have a high clearing point, a large absolute value of dielectric anisotropy, a low refractive index and good low temperature storage stability, while also enabling the liquid crystal dimming device containing it to have good contrast, good transmittance, a wide temperature range, good stability and low dispersion, which is beneficial to reducing glare in dimming fields such as architecture and transportation. Attached Figure Description

[0220] Figure 1 This is a schematic diagram of the structure of a single-cell liquid crystal device in the absence of power in this invention;

[0221] Figure 2 This is a schematic diagram of the structure of a single-cell liquid crystal device under power-on conditions in this invention;

[0222] Figure 3 This is a schematic diagram of the dual-cell liquid crystal device in the absence of power in this invention;

[0223] Figure 4 This is a schematic diagram of the dual-cell liquid crystal device under energized conditions in this invention. Detailed Implementation

[0224] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0225] For ease of explanation, in the following embodiments and comparative examples, the group structures of each component in the liquid crystal composition are represented by the codes listed in Table 1:

[0226] Table 1

[0227]

[0228]

[0229] Take the following compound with the following structural formula as an example:

[0230]

[0231] If the structural formula is represented by the codes listed in Table 1, it can be expressed as: nCCGF, where n in the code represents the number of C atoms in the alkyl group at the left end. For example, if n is "3", it means that the alkyl group is -C3H7. In the code, C represents 1,4-cyclohexylene, G represents 2-fluoro-1,4-phenyleneene, and F represents fluorine substituent.

[0232] The abbreviations for the test items in the following examples and comparative examples are as follows:

[0233] Cp Clearing point (nematic-isotropic phase transition temperature, °C)

[0234] Δn Optical anisotropy (25℃)

[0235] n o Refractive index of ordinary light (25℃)

[0236] n e Refractive index of unusual light (25℃)

[0237] ε ⊥ Dielectric constant perpendicular to the molecular axis

[0238] ε ∥ Dielectric constant parallel to the molecular axis

[0239] Δε dielectric anisotropy (1 kHz, 25 °C)

[0240] CR contrast

[0241] Transmittance in the transparent state (0V) and the open state (25℃, %)

[0242] Dark state (10V) transmittance (25℃, %)

[0243] -20℃ low-temperature storage stability, h

[0244] -30℃ low-temperature storage stability, h

[0245] -40℃ low-temperature storage stability, h

[0246] in,

[0247] Cp: ​​Measured using a melting point apparatus;

[0248] Δn, n o and n e The detection method is as follows: using a DR-M2 multi-band Abbe refractometer, filters of the corresponding wavelengths are inserted into the light source device to test the n-wavelength of the nematic liquid crystal at wavelengths of 450nm, 546nm, 589nm, and 589nm respectively. o and n o The corresponding Δn = n e -n o ;

[0249] Δε: Δε = ε ∥ -ε ⊥ , where ε ∥ ε is the dielectric constant parallel to the molecular axis. ⊥ The dielectric constant is perpendicular to the molecular axis. Test conditions: 25℃, 1kHz, VA type test box, box thickness 6μm;

[0250] The test method for -20℃ low-temperature storage is as follows: place the nematic liquid crystal medium in a glass bottle and store it at a constant temperature of -20℃. Record the time when crystal precipitation is observed.

[0251] The test method for -30℃ low-temperature storage is as follows: place the nematic liquid crystal medium in a glass bottle and store it at a constant temperature of -30℃. Record the time when crystal precipitation is observed.

[0252] The test method for -40℃ low-temperature storage is as follows: place the nematic liquid crystal medium in a glass bottle and store it at a constant temperature of -40℃. Record the time when crystal precipitation is observed.

[0253] CR: The transmittance of 0V and 10V liquid crystal cells in the visible light band is measured using an LS182 optical transmittance meter, i.e., Ttransmittance state and Tdark state, which is obtained by Ttransmittance state / Tdark state.

[0254] T_transmittance (0V): Transmittance of the test box when no power is applied.

[0255] T Dark State (10V): Transmittance when the test box is powered on (square wave, 60Hz, 10V).

[0256] The compounds used in the following examples can all be synthesized using well-known methods or obtained commercially. These synthetic techniques are conventional, and the resulting dye liquid crystal compositions have been tested and found to meet electronic compound standards.

[0257] The dye liquid crystal compositions were prepared according to the proportions of the dye liquid crystal compositions in the following examples. The dye liquid crystal compositions were prepared according to conventional methods in the art, such as mixing in a specified proportion by heating, ultrasound, suspension, etc.

[0258] Example 1

[0259] Liquid crystal composition B-1 of Example 1 was prepared according to the compounds listed in Table 2 and their weight percentages in the liquid crystal composition.

[0260] Table 2 Formulation of Liquid Crystal Composition B-1

[0261] Component Code weight percentage General code 3CCO1 10 M-1-4 5CCO1 4 M-1-4 5CCO2 4 M-1-4 3CC(N)3 6 III-1-1 1CC(N)O2 14 I-1-1-1 2CC(N)O2 14 I-1-1-1 3CCEC3 3 II-1 4CCEC3 3 II-1 3CCEC5 3 II-1 5CC(N)C3 20 III-7-1 4CCEC5 3 II-1 5CC(N)C5 13 III-7-1 3CCEPC3 3 II-12 total 100

[0262] Mixture M-1 is prepared by mixing the following: dye No. 1 at 1.73% by weight of the dye liquid crystal composition, dye No. 21 at 0.35% by weight of the dye liquid crystal composition, dye No. 28 at 0.52% by weight of the dye liquid crystal composition, chiral agent S-811 at 0.55% by weight of the dye liquid crystal composition, and liquid crystal composition B-1 at 96.85% by weight of the dye liquid crystal composition.

[0263] Embodiment 1 of the present invention is a single-cell liquid crystal dimming device, which includes, from bottom to top, a first transparent substrate, a first conductive layer, a first alignment layer, a dye liquid crystal material layer, a second alignment layer, a second conductive layer, and a second transparent substrate. The friction directions of the first alignment layer and the second alignment layer are parallel.

[0264] Mixture M-1 was filled into a dye-based liquid crystal material layer, the layer of which had a thickness of 6 μm. Performance tests were performed on the liquid crystal device, and the results are shown in Table 3.

[0265] Table 3

[0266]

[0267] For example, as listed in Table 3 regarding Δn, n e or n o The value indicates that at a wavelength of 650nm, Δn is 0.0375, n e It is 1.5097, n o It is 1.4722.

[0268] Example 2

[0269] Liquid crystal composition B-2 of Example 2 was prepared according to the compounds listed in Table 4 and their weight percentage in the liquid crystal composition.

[0270] Table 4 Formulation of Liquid Crystal Composition B-2

[0271]

[0272]

[0273] Mixture M-2 is prepared by mixing the following: dye No. 1 at 0.67% by weight of the dye liquid crystal composition, dye No. 21 at 0.13% by weight of the dye liquid crystal composition, dye No. 28 at 0.20% by weight of the dye liquid crystal composition, chiral agent S-811 at 0.80% by weight of the dye liquid crystal composition, and liquid crystal composition B-2 at 98.20% by weight of the dye liquid crystal composition.

[0274] Embodiment 2 of the present invention is a single-cell liquid crystal device, which includes, from bottom to top, a first transparent substrate, a first conductive layer, a first alignment layer, a dye liquid crystal material layer, a second alignment layer, a second conductive layer, and a second transparent substrate. The friction directions of the first alignment layer and the second alignment layer are parallel.

[0275] The mixture M-2 was filled into the dye liquid crystal material layer, wherein the thickness of the dye liquid crystal material layer was 9 μm. The performance of the liquid crystal device was tested, and the test results are shown in Table 5.

[0276] Table 5

[0277]

[0278] Example 3

[0279] Liquid crystal composition B-3 of Example 3 was prepared according to the compounds listed in Table 6 and their weight percentage in the liquid crystal composition.

[0280] Table 6 Formulation of Liquid Crystal Composition B-3

[0281]

[0282]

[0283] Mixture M-3 was prepared by mixing the following: dye No. 3 at 1.73% by weight of the dye liquid crystal composition, dye No. 24 at 0.35% by weight of the dye liquid crystal composition, dye No. 29 at 0.52% by weight of the dye liquid crystal composition, chiral agent S-811 at 0.80% by weight of the dye liquid crystal composition, and liquid crystal composition B-3 at 96.60% by weight of the dye liquid crystal composition.

[0284] Embodiment 3 of the present invention is a single-cell liquid crystal device, which includes, from bottom to top, a first transparent substrate, a first conductive layer, a first alignment layer, a dye liquid crystal material layer, a second alignment layer, a second conductive layer, and a second transparent substrate. The friction directions of the first alignment layer and the second alignment layer are parallel.

[0285] Mixture M-3 was filled into a dye-based liquid crystal material layer, the layer of which had a thickness of 9 μm. Performance tests were performed on the liquid crystal device, and the results are shown in Table 7.

[0286] Table 7

[0287]

[0288] Example 4

[0289] Liquid crystal composition B-4 of Example 4 was prepared according to the compounds listed in Table 8 and their weight percentage in the liquid crystal composition.

[0290] Table 8 Formulation of Liquid Crystal Composition B-4

[0291] Component Code weight percentage General code 4CC(N)7 6 III-1-1 3CC(N)O2 6 I-1-1-1 5CC(N)O2 8 I-1-1-1 3CC(N)O3 8 I-1-1-1 3CCEC3 4 II-1 3CC2 8 M-1-1 3CC4 4 M-1-1 3CPO2 8 M-2-2 3CC(N)C5 10 III-7-1 5CC(N)C3 10 III-7-1 4CC(N)CO2 11 I-7-1-1 5CC(N)CO3 11 I-7-1-1 VCCP1 2 M-12-3 3CC1OC5 4 II-6 total 100

[0292] Mixture M-4 is prepared by mixing the following: dye No. 16 at 2.00% by weight of the dye liquid crystal composition, dye No. 27 at 0.40% by weight of the dye liquid crystal composition, dye No. 30 at 0.60% by weight of the dye liquid crystal composition, chiral agent S-811 at 0.95% by weight of the dye liquid crystal composition, and liquid crystal composition B-4 at 96.05% by weight of the dye liquid crystal composition.

[0293] Embodiment 4 of the present invention is a single-cell liquid crystal device, which includes, from bottom to top, a first transparent substrate, a first conductive layer, a first alignment layer, a dye liquid crystal material layer, a second alignment layer, a second conductive layer, and a second transparent substrate. The friction directions of the first alignment layer and the second alignment layer are parallel.

[0294] Mixture M-4 was filled into a dye-based liquid crystal material layer, the layer of which had a thickness of 8 μm. Performance tests were performed on the liquid crystal device, and the results are shown in Table 9.

[0295] Table 9

[0296]

[0297]

[0298] Example 5

[0299] Liquid crystal composition B-5 of Example 5 was formulated according to the compounds listed in Table 10 and their weight percentage in the liquid crystal composition.

[0300] Table 10 Formulation of Liquid Crystal Composition B-5

[0301] Component Code weight percentage General code 5CC(N)O5 5 I-1-1-1 3CC(N)O3 5 I-1-1-1 3CCEC3 4 II-1 3CCEC5 4 II-1 3CCEC4 4 II-1 3CC2 8 M-1-1 3CC4 8 M-1-1 3CPO2 8 M-2-2 3CC(N)C5 12 III-7-1 5CC(N)CO5 14 I-7-1-1 5CC(N)CO3 14 I-7-1-1 2CCECC3 2 II-11 3CCECC2 2 II-11 V2CCP1 3 M-12-3 3CCV 5 M-1-3 3CCEPC3 2 II-12 total 100

[0302] Mixture M-5 is prepared by mixing the following: dye No. 5 at 1.33% by weight of the dye liquid crystal composition, dye No. 22 at 0.27% by weight of the dye liquid crystal composition, dye No. 29 at 0.40% by weight of the dye liquid crystal composition, chiral agent S811 at 1.10% by weight of the dye liquid crystal composition, and liquid crystal composition B-5 at 96.90% by weight of the dye liquid crystal composition.

[0303] Embodiment 5 of the present invention is a single-cell liquid crystal device, which includes, from bottom to top, a first transparent substrate, a first conductive layer, a first alignment layer, a dye liquid crystal material layer, a second alignment layer, a second conductive layer, and a second transparent substrate, wherein the friction directions of the first alignment layer and the second alignment layer are parallel.

[0304] Mixture M-5 was filled into a dye-based liquid crystal material layer, the layer of which had a thickness of 6 μm. Performance tests were performed on the liquid crystal device, and the results are shown in Table 11.

[0305] Table 11

[0306]

[0307]

[0308] Comparative Example 1

[0309] Liquid crystal composition D-1 of Comparative Example 1 was prepared according to the compounds listed in Table 12 and their weight percentage in the liquid crystal composition.

[0310] Table 12 Formulation of Liquid Crystal Composition D-1

[0311] Component Code weight percentage General code 5CC(N)5 5 III-1-1 3CC(N)3 5 III-1-1 3CCEC3 4 II-1 3CCEC5 4 II-1 3CCEC4 4 II-1 3CC2 8 M-1-1 3CC4 8 M-1-1 3CPO2 8 M-2-2 3CC(N)C5 12 III-7-1 5CC(N)C5 14 III-7-1 5CC(N)C3 14 III-7-1 2CCECC3 2 II-11 3CCECC2 2 II-11 V2CCP1 3 M-12-3 3CCV 5 M-1-3 3CCEPC3 2 II-12 total 100

[0312] Mixture CM-1 is prepared by mixing the following: dye No. 5 at 1.33% by weight of the dye liquid crystal composition, dye No. 22 at 0.27% by weight of the dye liquid crystal composition, dye No. 29 at 0.40% by weight of the dye liquid crystal composition, chiral agent S-811 at 1.10% by weight of the dye liquid crystal composition, and liquid crystal composition D-1 at 96.90% by weight of the dye liquid crystal composition.

[0313] Comparative Example 1 of the present invention is a single-cell liquid crystal device, which includes, from bottom to top, a first transparent substrate, a first conductive layer, a first alignment layer, a dye liquid crystal material layer, a second alignment layer, a second conductive layer, and a second transparent substrate, wherein the friction directions of the first alignment layer and the second alignment layer are parallel.

[0314] The mixture CM-1 was filled into a dye-based liquid crystal material layer, the thickness of which was 6 μm. Performance tests were performed on the liquid crystal device, and the results are shown in Table 13.

[0315] Table 13

[0316]

[0317] Example 6

[0318] Liquid crystal composition B-6 of Example 6 was formulated according to the compounds listed in Table 14 and their weight percentages in the liquid crystal composition.

[0319] Table 14 Formulation of Liquid Crystal Composition B-6

[0320]

[0321]

[0322] Mixture M-6 is prepared by mixing the following: dye No. 16 at 2.00% by weight of the dye liquid crystal composition, dye No. 27 at 0.40% by weight of the dye liquid crystal composition, dye No. 30 at 0.60% by weight of the dye liquid crystal composition, chiral agent S-811 at 0.95% by weight of the dye liquid crystal composition, and liquid crystal composition B-6 at 96.05% by weight of the dye liquid crystal composition.

[0323] Embodiment 6 of the present invention is a single-cell liquid crystal dimming device, which includes, from bottom to top, a first transparent substrate, a first conductive layer, a first alignment layer, a dye liquid crystal material layer, a second alignment layer, a second conductive layer, and a second transparent substrate, wherein the friction directions of the first alignment layer and the second alignment layer are parallel.

[0324] Mixture M-6 was filled into a dye-based liquid crystal material layer, the layer thickness of which was 7 μm. Performance tests were performed on the liquid crystal device, and the results are shown in Table 15.

[0325] Table 15

[0326]

[0327] Example 7

[0328] Liquid crystal composition B-7 of Example 7 was formulated according to the compounds listed in Table 16 and their weight percentages in the liquid crystal composition.

[0329] Table 16 Formulation of Liquid Crystal Composition B-7

[0330]

[0331]

[0332] Mixture M-7 is prepared by mixing dye No. 1 (1.60% by weight of the dye liquid crystal composition), dye No. 2 (0.32% by weight of the dye liquid crystal composition), dye No. 28 (0.48% by weight of the dye liquid crystal composition), and liquid crystal composition B-7 (97.60% by weight of the dye liquid crystal composition).

[0333] Embodiment 7 of the present invention is a dual-cell liquid crystal dimming device, comprising a first liquid crystal cell and a second liquid crystal cell, arranged from bottom to top as the first liquid crystal cell and the second liquid crystal cell; wherein the first liquid crystal cell comprises, from bottom to top, a first transparent substrate, a first conductive layer, a first alignment layer, a first dye liquid crystal material layer, a second alignment layer, a second conductive layer, and a second transparent substrate, with the friction directions of the first alignment layer and the second alignment layer being parallel; wherein the second liquid crystal cell comprises, from bottom to top, a third transparent substrate, a third conductive layer, a third alignment layer, a second dye liquid crystal material layer, a fourth alignment layer, a fourth conductive layer, and a fourth transparent substrate, with the friction directions of the third alignment layer and the fourth alignment layer being parallel; wherein the second liquid crystal cell is located above the first liquid crystal cell, and the friction directions of the first liquid crystal cell and the second liquid crystal cell are perpendicular to each other.

[0334] The mixture M-7 was filled into the first dye-liquid crystal material layer and the second dye-liquid crystal material layer, respectively, wherein the thickness of both the first and second dye-liquid crystal material layers was 6 μm. Performance tests were performed on the liquid crystal device, and the results are shown in Table 17.

[0335] Table 17

[0336]

[0337] Example 8

[0338] Liquid crystal composition B-8 of Example 8 was formulated according to the compounds listed in Table 18 and their weight percentage in the liquid crystal composition.

[0339] Table 18 Formulation of Liquid Crystal Composition B-8

[0340] Component Code weight percentage General code 3CC2 10 M-1-1 5CC2 10 M-1-1 VCC(N)O4 6 I-1-1-2 5CC(N)O5 8 I-1-1-1 3CC(N)CO2 8 I-7-1-1 VCC(N)CO4 8 I-7-1-2 VCC(N)CO3 8 I-7-1-2 3CCEC3 3 II-1 4CCEC3 3 II-1 3CCEC5 3 II-1 5CC(N)C3 12 III-7-1 4CCEC5 3 II-1 5CC(N)C5 12 III-7-1 3CCEPC3 3 II-12 3CCEPC5 3 II-12 total 100

[0341] Mixture M-8 is prepared by mixing dye No. 5 at 1.73% by weight of the dye liquid crystal composition, dye No. 22 at 0.35% by weight of the dye liquid crystal composition, dye No. 29 at 0.52% by weight of the dye liquid crystal composition, and liquid crystal composition B-8 at 97.40% by weight of the dye liquid crystal composition.

[0342] Embodiment 8 of the present invention is a dual-cell liquid crystal dimming device, comprising a first liquid crystal cell and a second liquid crystal cell, arranged from bottom to top. The first liquid crystal cell comprises, from bottom to top, a first transparent substrate, a first conductive layer, a first alignment layer, a first dye-liquid crystal material layer, a second alignment layer, a second conductive layer, and a second transparent substrate, with the friction directions of the first and second alignment layers parallel. The second liquid crystal cell comprises, from bottom to top, a third transparent substrate, a third conductive layer, a third alignment layer, a second dye-liquid crystal material layer, a fourth alignment layer, a fourth conductive layer, and a fourth transparent substrate, with the friction directions of the third and fourth alignment layers parallel. The second liquid crystal cell is located above the first liquid crystal cell, and the friction directions of the first and second liquid crystal cells are perpendicular to each other.

[0343] The mixture M-8 was filled into the first dye-liquid crystal material layer and the second dye-liquid crystal material layer, respectively, wherein the thickness of both the first and second dye-liquid crystal material layers was 9 μm. Performance tests were performed on the liquid crystal device, and the results are shown in Table 19.

[0344] Table 19

[0345]

[0346] Example 9

[0347] Liquid crystal composition B-9 of Example 9 was formulated according to the compounds listed in Table 20 and their weight percentages in the liquid crystal composition.

[0348] Table 20 Formulation of Liquid Crystal Composition B-9

[0349] Component Code weight percentage General code 5CC(N)O5 11 I-1-1-1 3CC(N)O3 11 I-1-1-1 4CC(N)O2 5 I-1-1-1 3CCEC3 2 II-1 3CCEC5 2 II-1 3CPO1 6 M-2-2 3CPO2 6 M-2-2 3CC(N)C5 6 III-7-1 5CCWO3 10 N-9 3CCWO2 10 N-9 5CC(N)CO3 12 I-7-1-1 5CC(N)CO5 13 I-7-1-1 2CCECC3 3 II-11 3CCECC2 3 II-11 total 100

[0350] Mixture M-9 was prepared by mixing the following: dye No. 3 at 2.67% by weight of the dye liquid crystal composition, dye No. 24 at 0.53% by weight of the dye liquid crystal composition, dye No. 29 at 0.80% by weight of the dye liquid crystal composition, chiral agent S-811 at 1.90% by weight of the dye liquid crystal composition, and liquid crystal composition B-9 at 94.10% by weight of the dye liquid crystal composition.

[0351] Embodiment 9 of the present invention is a single-cell liquid crystal device, which includes, from bottom to top, a first transparent substrate, a first conductive layer, a first alignment layer, a dye liquid crystal material layer, a second alignment layer, a second conductive layer, and a second transparent substrate, wherein the friction directions of the first alignment layer and the second alignment layer are parallel.

[0352] The mixture M-9 was filled into the dye liquid crystal material layer, wherein the thickness of the dye liquid crystal material layer was 4 μm. The performance of the liquid crystal device was tested, and the test results are shown in Table 21.

[0353] Table 21

[0354]

[0355] Example 10

[0356] Liquid crystal composition B-10 of Example 10 was formulated according to the compounds listed in Table 22 and their weight percentages in the liquid crystal composition.

[0357] Table 22 Formulation of Liquid Crystal Composition B-10

[0358]

[0359]

[0360] Mixture M-10 is prepared by mixing the following: dye No. 1 at 2.00% by weight of the dye liquid crystal composition, dye No. 21 at 0.40% by weight of the dye liquid crystal composition, dye No. 28 at 0.60% by weight of the dye liquid crystal composition, chiral agent S-811 at 1.86% by weight of the dye liquid crystal composition, and liquid crystal composition B-10 at 95.14% by weight of the dye liquid crystal composition.

[0361] Embodiment 10 of the present invention is a single-cell liquid crystal dimming device, which includes, from bottom to top, a first transparent substrate, a first conductive layer, a first alignment layer, a dye liquid crystal material layer, a second alignment layer, a second conductive layer, and a second transparent substrate, wherein the friction directions of the first alignment layer and the second alignment layer are parallel.

[0362] The mixture M-10 was filled into the dye liquid crystal material layer, wherein the thickness of the dye liquid crystal material layer was 4 μm. The performance of the liquid crystal device was tested, and the test results are shown in Table 23.

[0363] Table 23

[0364]

[0365] Example 11

[0366] Liquid crystal composition B-11 of Example 11 was formulated according to the compounds listed in Table 24 and their weight percentages in the liquid crystal composition.

[0367] Table 24 Formulation of Liquid Crystal Composition B-11

[0368]

[0369]

[0370] Mixture M-11 is prepared by mixing dye No. 16, which accounts for 0.89% by weight of the dye liquid crystal composition, dye No. 27, which accounts for 0.18% by weight of the dye liquid crystal composition, dye No. 30, which accounts for 0.27% by weight of the dye liquid crystal composition, and liquid crystal composition B-11, which accounts for 98.66% by weight of the dye liquid crystal composition.

[0371] Embodiment 11 of the present invention is a dual-cell liquid crystal dimming device, comprising a first liquid crystal cell and a second liquid crystal cell, arranged from bottom to top as the first liquid crystal cell and the second liquid crystal cell; wherein the first liquid crystal cell comprises, from bottom to top, a first transparent substrate, a first conductive layer, a first alignment layer, a first dye liquid crystal material layer, a second alignment layer, a second conductive layer, and a second transparent substrate, with the friction directions of the first alignment layer and the second alignment layer being parallel; the second liquid crystal cell comprises, from bottom to top, a third transparent substrate, a third conductive layer, a third alignment layer, a second dye liquid crystal material layer, a fourth alignment layer, a fourth conductive layer, and a fourth transparent substrate, with the friction directions of the third alignment layer and the fourth alignment layer being parallel; wherein the second liquid crystal cell is located above the first liquid crystal cell, and the friction directions of the first liquid crystal cell and the second liquid crystal cell are perpendicular to each other.

[0372] The mixture M-11 was filled into the first dye-liquid crystal material layer and the second dye-liquid crystal material layer, respectively, wherein the thickness of both the first and second dye-liquid crystal material layers was 9 μm. Performance tests were performed on the liquid crystal device, and the results are shown in Table 25.

[0373] Table 25

[0374]

[0375] Example 12

[0376] Liquid crystal composition B-12 of Example 12 was formulated according to the compounds listed in Table 26 and their weight percentages in the liquid crystal composition.

[0377] Table 26 Formulation of Liquid Crystal Composition B-12

[0378] Component Code weight percentage General code VCW1 7 N-2 3CCEC3 2 II-1 3CCEC5 2 II-1 5CCO1 8 M-1-4 3CCO1 8 M-1-4 VCC(N)O2 6 I-1-1-2 VCC(N)O1 10 I-1-1-2 3CC(N)CO5 10 I-7-1-1 5CC(N)CO5 10 I-7-1-1 5CC(N)CO3 10 I-7-1-1 3CLWO3 5 N-13 4LWO2 6 N-3 2CCECC3 3 II-11 3CCECC2 3 II-11 3CC1OC5 10 II-6 total 100

[0379] Mixture M-12 is prepared by mixing dye No. 9 (1.33% by weight of the dye liquid crystal composition), dye No. 25 (0.27% by weight of the dye liquid crystal composition), dye No. 31 (0.40% by weight of the dye liquid crystal composition), and liquid crystal composition B-12 (98.00% by weight of the dye liquid crystal composition).

[0380] Embodiment 12 of the present invention is a dual-cell liquid crystal dimming device, comprising a first liquid crystal cell and a second liquid crystal cell, arranged from bottom to top as the first liquid crystal cell and the second liquid crystal cell; wherein the first liquid crystal cell comprises, from bottom to top, a first transparent substrate, a first conductive layer, a first alignment layer, a first dye liquid crystal material layer, a second alignment layer, a second conductive layer, and a second transparent substrate, with the friction directions of the first alignment layer and the second alignment layer being parallel; wherein the second liquid crystal cell comprises, from bottom to top, a third transparent substrate, a third conductive layer, a third alignment layer, a second dye liquid crystal material layer, a fourth alignment layer, a fourth conductive layer, and a fourth transparent substrate, with the friction directions of the third alignment layer and the fourth alignment layer being parallel; wherein the second liquid crystal cell is located above the first liquid crystal cell, and the friction directions of the first liquid crystal cell and the second liquid crystal cell are perpendicular to each other.

[0381] The mixture M-12 was filled into the first dye-liquid crystal material layer and the second dye-liquid crystal material layer, respectively, wherein the thickness of both the first and second dye-liquid crystal material layers was 6 μm. Performance tests were performed on the liquid crystal device, and the results are shown in Table 27.

[0382] Table 27

[0383]

[0384] Comparative Example 2

[0385] Liquid crystal composition D-2 of Comparative Example 2 was prepared according to the compounds listed in Table 28 and their weight percentage in the liquid crystal composition.

[0386] Table 28 Formulation of Liquid Crystal Composition D-2

[0387] Component Code weight percentage General code 3CCEC3 3 II-1 3CCEC5 3 II-1 3CCEC5 3 II-1 3CCO1 7 M-1-4 3CCO3 7 M-1-4 3CCV 5 M-1-3 3CCP1 5 M-12-1 V2CC(N)C3 15 III-7-2 3CC(N)C5 15 III-7-1 5CC(N)C5 15 III-7-1 3CLWO3 8 N-13 4LWO2 8 N-3 3CCEPC5 3 II-12 5CCEPC3 3 II-12 total 100

[0388] Mixture CM-2 is prepared by mixing dye No. 16 at 0.89% by weight of the dye liquid crystal composition, dye No. 27 at 0.18% by weight of the dye liquid crystal composition, dye No. 30 at 0.27% by weight of the dye liquid crystal composition, and liquid crystal composition D-2 at 98.66% by weight of the dye liquid crystal composition.

[0389] Comparative Example 2 of the present invention is a single-cell liquid crystal dimming device, which includes, from bottom to top, a first transparent substrate, a first conductive layer, a first alignment layer, a dye liquid crystal material layer, a second alignment layer, a second conductive layer, and a second transparent substrate, wherein the friction directions of the first alignment layer and the second alignment layer are parallel.

[0390] The mixture CM-2 was filled into a dye-based liquid crystal material layer, the thickness of which was 6 μm. Performance tests were performed on the liquid crystal device, and the results are shown in Table 29.

[0391] Table 29

[0392]

[0393] As can be seen from the comparison of the embodiments and comparative examples of this application, the present invention, through the optimization of the structure and content of the compound of general formula I, and through the mutual compounding of specific components and their contents in the dye liquid crystal composition, enables the dye liquid crystal composition of the present invention to have a high clearing point (Cp: 101.2~138), a large absolute value of dielectric anisotropy (Δε: -6.49~-9.2), and an appropriate vertical dielectric (ε ⊥ It exhibits low optical anisotropy (Δn(650nm): 0.0364–0.0634; Δn(589nm): 0.0367–0.0639; Δn(546nm): 0.0375–0.0648; Δn(450nm): 0.0383–0.066) and good low-temperature storage stability (-20℃: >2000h; -30℃: >2000h; -40℃: >2000h).

[0394] In summary, this invention, through the specific structure and content of the compounds, enables the dye liquid crystal composition to possess high clearing point, large absolute value of dielectric anisotropy, appropriate vertical dielectric, low refractive index, good low-temperature storage stability, and good low-temperature miscibility. Simultaneously, it allows the liquid crystal dimming device containing the composition to exhibit good contrast, good transmittance, a wide temperature range, good stability, and low dispersion. This enables the liquid crystal dimming device to perform dimming in architectural and transportation applications, effectively reducing glare.

[0395] The formulation of dye-based liquid crystal compositions involves simultaneously adjusting many of their performance parameters. It is impossible to adjust one performance parameter of a dye-based liquid crystal composition without affecting the value of another. Sometimes, adding a monomeric liquid crystal to adjust a certain performance parameter of a dye-based liquid crystal composition may be beneficial to one or more other properties, but may be detrimental to the improvement of others. In some embodiments of the present invention, the dye-based liquid crystal composition, while maintaining a relatively high clearing point and good contrast, has a low refractive index and a large absolute value of dielectric anisotropy; furthermore, this allows liquid crystal dimming devices incorporating it to better reduce glare in applications.

[0396] The applicant declares that the present invention is illustrated by the above embodiments to provide a liquid crystal composition and a liquid crystal display device, but the present invention is not limited to the above embodiments, that is, it does not mean that the present invention must rely on the above embodiments to be implemented. Those skilled in the art should understand that any improvements to the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A dye-based liquid crystal composition, characterized in that, The dye liquid crystal composition comprises at least one liquid crystal composition A and at least one dichroic dye, wherein the liquid crystal composition A comprises at least one compound of general formula I: in, R1 and R2 independently represent straight-chain alkyl groups containing 1-12 carbon atoms and branched alkyl groups containing 3-12 carbon atoms, respectively. The -CH2- groups, one or more of the straight-chain alkyl group containing 1-12 carbon atoms and the branched alkyl group containing 3-12 carbon atoms, can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO- in a manner where the -O- atoms are not directly connected. At most one -H can be replaced by -F or -Cl; ring and ring Each represents independently in One or more -CH2- can be replaced by -O-, and a single bond in one or at most two rings can be replaced by a double bond; Z1 and Z2 independently represent single bonds, -CH2CH2-, -(CH2)3-, -(CH2)4-, -CF2CF2-, -CO-O-, -O-CO-, -O-CO-O-, -C≡C-, -CH=CH-, -CF=CF-, -CH2O-, -OCH2-, or -CF2O-; n A1 and n A2 Each can independently represent 0, 1, or 2, where when n A1 When 2 is represented, the ring They can be the same or different, Z1 can be the same or different; when n A2 When 2 is represented, the ring They can be the same or different; Z2 can be the same or different.

2. The dye-liquid crystal composition according to claim 1, characterized in that, The dichroic dye is selected from any one or a combination of at least two of the following compounds: The dichroic dye is selected from any one or at least two of the group consisting of first-class dichroic dyes, second-class dichroic dyes, and third-class dichroic dyes. The first-class dichroic dyes include at least one dichroic dye selected from the group consisting of blue dyes, blue-green dyes, and blue-violet dyes. The second-class dichroic dyes include at least one dichroic dye selected from the group consisting of purple dyes and magenta dyes. The third-class dichroic dyes include at least one dichroic dye selected from the group consisting of orange-yellow dyes.

3. The dye-liquid crystal composition according to claim 2, characterized in that, The compound of general formula I accounts for 0.1%-80% of the weight of the liquid crystal composition A; the liquid crystal composition A accounts for 90%-99.3% of the weight of the dye liquid crystal composition; and the dichroic dye accounts for 0.01%-10% of the weight of the dye liquid crystal composition.

4. The dye-liquid crystal composition according to claim 1, characterized in that, The liquid crystal composition A further comprises: At least one compound of general formula II: in, R P1 and R P2 Each can be independently represented as a straight-chain alkyl group containing 1-12 carbon atoms, or a branched alkyl group containing 3-12 carbon atoms. One or more non-adjacent -CH2- groups of the straight-chain alkyl group containing 1-12 carbon atoms and the branched alkyl group containing 3-12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-; ring and ring Each represents independently in One or more -CH2- bonds can be replaced by -O- bonds, and single bonds in one or at most two rings can be replaced by double bonds. At most one -H in the halogen can be replaced by a halogen; Z P1 This indicates -CO-O-, -O-CO-, -O-CO-O-, -CF2O-, -CH2O-, or -OCH2-; n P1 and n P2 Each can independently represent 0, 1, or 2; The compound of general formula II accounts for 0.1%-60% of the weight percentage of the liquid crystal composition A.

5. The dye-liquid crystal composition according to claim 1, characterized in that, The liquid crystal composition A further comprises: At least one compound of general formula M: in, R M1 and R M2 Each can be independently represented as a straight-chain alkyl group containing 1-12 carbon atoms, or a branched alkyl group containing 3-12 carbon atoms. One or more non-adjacent -CH2- groups of the straight-chain alkyl group containing 1-12 carbon atoms and the branched alkyl group containing 3-12 carbon atoms may 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 -CH2- bonds can be replaced by -O- bonds, and single bonds in one or at most two rings can be replaced by double bonds. At most one -H in the halogen can be replaced by a halogen; Z M1 and Z M2 Each can independently represent a single bond, -CH2CH2-, -C≡C-, -CH=CH-, -(CH2)3-, or -(CH2)4-; and n M Represents 0, 1, or 2, where when n M When 2 is represented, the ring They can be the same or different, Z M2 They can be the same or different; Wherein, the compound of general formula M accounts for 0.1%-60% of the weight percentage of the liquid crystal composition A.

6. The dye-liquid crystal composition according to claim 1, characterized in that, The liquid crystal composition A further comprises: At least one compound of general formula III: in, R3 and R4 independently represent straight-chain alkyl groups containing 1-12 carbon atoms and branched alkyl groups containing 3-12 carbon atoms, respectively. One or more non-adjacent -CH2- groups of the straight-chain alkyl group containing 1-12 carbon atoms or the branched alkyl group containing 3-12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -CO-O-, or -O-CO-, and at most one -H group of the aforementioned groups may be replaced by -F or -Cl. ring and ring Each represents independently in One or more -CH2- can be replaced by -O-, and a single bond in one or at most two rings can be replaced by a double bond; Z3 and Z4 independently represent single bonds, -CH2CH2-, -(CH2)3-, -(CH2)4-, -CF2CF2-, -CO-O-, -O-CO-, -O-CO-O-, -C≡C-, -CH=CH-, -CF=CF-, -CH2O-, -OCH2-, or -CF2O-; n B1 and n B2 Each can independently represent 0, 1, or 2, where when n B1 When 2 is represented, the ring They can be the same or different, Z3 can be the same or different; when n B2 When 2 is represented, the ring They can be the same or different; Z4 can be the same or different. The compound of general formula III accounts for 0.1%-60% of the weight percentage of the liquid crystal composition A.

7. The dye-liquid crystal composition according to claim 1, characterized in that, The liquid crystal composition A further comprises: At least one compound of the general formula N: in, R E1 and R E2 Each can be independently represented as a straight-chain alkyl group containing 1-12 carbon atoms, or a branched alkyl group containing 3-12 carbon atoms. One or more non-adjacent -CH2- groups of the straight-chain alkyl group containing 1-12 carbon atoms or the branched alkyl group containing 3-12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-. ring and ring Each represents independently in One or more -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 -F, -Cl, or -CN, and one or more -CH= in a ring can be replaced by -N=; Z E1 and Z E2 Each can independently represent a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, -CF2CF2-, -(CH2)4-, -CF2O-, or -OCF2-; L E1 and L E2 Each can independently represent -H, halogen, alkyl group containing 1-3 carbon atoms, or alkoxy group containing 1-3 carbon atoms; and, n E1 n represents 0, 1, 2, or 3. E2 Represents 0 or 1, and 0 ≤ n E1 +n E2 ≤3; when n E1 When representing 2 or 3, the ring Same or different, Z E1 Same or different; The compound of general formula N accounts for 0.1%-40% of the weight percentage of the liquid crystal composition A.

8. The dye-liquid crystal composition according to claim 1, characterized in that, The dye liquid crystal composition further comprises at least one chiral agent, wherein the chiral agent is selected from any one or a combination of at least two of the following compounds: as well as Where * indicates a chiral site; The chiral agent accounts for 0.01%-10% of the weight of the dye liquid crystal composition.

9. A liquid crystal dimming device comprising the dye-liquid crystal composition as described in any one of claims 1-8, characterized in that, The liquid crystal dimming device comprises at least one liquid crystal cell.

10. The application of the liquid crystal dimming device according to claim 9.

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