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, and the liquid crystal composition A comprises at least one compound as shown in a general formula I. According to the dye liquid crystal composition and the preparation method thereof, by adopting the compound with a specific structure as shown in the general formula I, the dye liquid crystal composition has a relatively high clearing point, relatively low rotary viscosity, a relatively large dielectric anisotropy absolute value, proper vertical dielectric, 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 the advantages of better contrast ratio, better transmittance, wider temperature application range, better stability, higher response speed and lower dispersion, and can reduce the glare phenomenon in the dimming fields of buildings, traffic and the like. # imgabs0 #

Description

Technical Field

[0001] The present invention belongs to the technical field of liquid crystal materials, and in particular relates to a dye liquid crystal composition, a liquid crystal dimming device containing the dye liquid crystal composition, and applications thereof. Background Art

[0002] At present, the application of liquid crystal dimming devices in the fields of architecture and transportation is becoming more and more widespread. Conventional solutions include the use of PDLC (polymer dispersed liquid crystal), EC (electrochromic) and SPD (suspended particle) for dimming. Although the technical indicators have their own advantages and disadvantages, the overall function cannot perfectly match the market demand. Therefore, the use of liquid crystal dimming devices is still subject to certain restrictions. Among them, PDLC dimming glass is transparent when powered on and foggy when powered off. Due to the large fog, the application scenarios of PDLC are limited. It is more suitable for conference room partitions and cannot be widely used in automotive glass. The principle of EC is to achieve dimming through redox reaction, but the response speed is slow (~5min / m 2 ), and the larger the glass size, the slower the color change, and uneven color change is likely to occur; and the operating voltage of SPD dimming glass is as high as 110V, which poses a safety risk. Therefore, its application in car window glass is also greatly restricted.

[0003] Dye liquid crystal light modulators are made of liquid crystal compositions doped with dichroic dyes. Under voltage drive, they can control the direction of dye molecules, change transmittance, and achieve continuous adjustment of light and dark states. Compared with other dimming schemes, dye liquid crystal light modulators have the advantages of low driving voltage, low power consumption, no haze, no viewing angle problems, fast response, variable colors, and diversified displays. Dye liquid crystal light modulators are often called smart windows, smart dimming elements, or switchable windows, etc., and are receiving more and more attention in application scenarios such as vehicles, buildings, wearable devices, and transparent displays.

[0004] However, there are still many technical issues to be solved in dye liquid crystal dimming devices. For example, in some application scenarios of thick liquid crystal dimming device boxes or multi-layered liquid crystal dimming device boxes, low dispersion is required to reduce the influence of liquid crystal dispersion on the transmission spectrum. The lower liquid crystal birefringence can reduce the scattering of light by high-thickness liquid crystal materials and prevent glare. In some practical outdoor applications such as vehicles and buildings, the material needs to have a higher clearing point to achieve a wide liquid crystal phase. In some practical applications, low voltage drive is required, which requires the liquid crystal material to have a higher dielectric. In addition, considering long-term weather resistance, the dye also needs to have good solubility, good solution stability and good photothermal stability in the liquid crystal material. However, these properties of dye liquid crystal materials currently need to be further improved.

[0005] Therefore, it is an urgent problem to be solved in this field to develop a dye liquid crystal material with high light stability, high absolute value of dielectric anisotropy, low refractive index, low dispersibility, and high order of the dichroic dye contained therein. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a dye liquid crystal composition, a liquid crystal light modulation device containing the same, and its application. The dye liquid crystal composition has a high clearing point, low rotational viscosity, large absolute value of dielectric anisotropy, appropriate vertical dielectric, low refractive index, good low-temperature storage stability, and good low-temperature miscibility, while enabling the liquid crystal light modulation device containing the same to have good contrast, good transmittance, wide temperature range of use, good stability, fast response speed, and low dispersion, and can reduce the glare phenomenon in the light modulation application of the liquid crystal light modulation device.

[0007] To achieve this purpose, the present invention adopts the following technical solutions:

[0008] In the first aspect, the present invention provides a dye liquid crystal composition, which 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;

[0009]

[0010] Wherein, R1 and R2 each independently represent a straight-chain or branched-chain alkyl group containing 1-12 (for example, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, One or more non-adjacent -CH2- in the straight-chain or branched-chain alkyl group containing 1-12 carbon atoms can be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO- respectively, and at most one -H in the straight-chain or branched-chain alkyl group containing 1-12 carbon atoms can be replaced by -F or -Cl;

[0011] Ring Represents Wherein One or more -CH2- in it can be replaced by -O-, and one or at most two single bonds in the ring can be replaced by double bonds;

[0012] Z1 represents a single bond, -CH2CH2-, -(CH2)3-, -(CH2)4-, -CF2CF2-, -CO-O-, -O-CO-, -O-CO-O-, -C≡C-, -CH=CH-, -CF=CF-, -CH2O-, -OCH2-, or -CF2O-;

[0013] Z2 represents -CH2CH2-, -CF2CF2-, -CH=CH-, -CF=CF-, -CH2O-, -OCH2- or -CF2O-;

[0014] n A1 represents 0, 1, or 2, where when n A1 = 2, the rings can be the same or different, and Z1 can be the same or different;

[0015] L1 and L2 each independently represent a halogen, -CN, -CF3 or -OCF3.

[0016] In some embodiments of the present invention, R1 and R2 each independently represent a straight-chain alkyl group having 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms, a branched-chain alkyl group having 3-8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms, a straight-chain alkoxy group having 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms, a branched-chain alkoxy group having 3-8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms, a straight-chain alkenyl group having 2-8 (e.g., 2, 3, 4, 5, 6, 7 or 8) carbon atoms or a branched-chain alkenyl group having 3-8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms.

[0017] The alkenyl group of the present invention is preferably a group represented by any one of formulas (V1)-(V9), and particularly preferably formulas (V1), (V2), (V8) or (V9). The groups represented by formulas (V1) to (V9) are shown as follows:

[0018] wherein, " X " represents a carbon atom in the ring structure to which it is bonded.

[0019] In the present invention, when n A1 = 2, there are two rings in the compound These two rings can have the same structure or different structures. Exemplarily, one can be and the other can be In the present invention, when it comes to the expression "the same or different", it has the same meaning.

[0020] In the present invention, "can be separately and independently substituted by..." means that it can be substituted or not substituted, that is, whether substituted or not substituted, it belongs to the protection scope of the present invention. The same applies to "can be separately and independently replaced by...", and the positions of "substituted" and "replaced" can be arbitrary.

[0021] In the present invention, the short straight lines on one or both sides of the group structure represent access bonds and do not represent methyl groups. For example, the short straight line on the left, the short straight lines on both sides.

[0022] In the present invention, the halogen includes fluorine, chlorine, bromine, iodine, etc.; when the same description is involved hereinafter, it shall have the same meaning.

[0023] In some embodiments of the present invention, each of L1 and L2 independently represents -F.

[0024] In some embodiments of the present invention, Z1 represents a single bond, -CH2CH2-, -CH=CH-, -CH2O-, or -OCH2-; further, Z1 represents a single bond or -CH=CH-.

[0025] In some embodiments of the present invention, Z2 represents -CH2CH2-, -CF2O-, -CH2O-, or -OCH2-; further, Z2 represents -CH2O-.

[0026] In some embodiments of the present invention, in order to obtain a higher clearing point, a lower rotational viscosity, 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., one, two, three, four, or five) compound selected from the group consisting of at least one (e.g., one, two, three, four, or five) of the following compounds:

[0027]

[0028]

[0029] and

[0030]

[0031] In some embodiments of the present invention, in order to obtain a higher clearing point, a lower rotational viscosity, 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., one, two, three, four, or five) compound selected from the group consisting of the compound of general formula I-1 and the compound of general formula I-4.

[0032] In some embodiments of the present invention, in order to obtain a higher clearing point, a lower rotational viscosity, 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., one, two, three, four, or five) compound selected from the group consisting of at least one (e.g., one, two, three, four, or five) of the following compounds:

[0033]

[0034]

[0035] and

[0036]

[0037] wherein, R 11 represents a straight-chain alkyl group having 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms or a branched-chain alkyl group having 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms;

[0038] R 12 represents a straight-chain alkenyl group having 2-8 (e.g., 2, 3, 4, 5, 6, 7, or 8) carbon atoms or a branched-chain alkenyl group having 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms;

[0039] R2 represents a straight-chain alkyl group having 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched-chain alkyl group having 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms, a straight-chain alkoxy group having 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, or a branched-chain alkoxy group having 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms.

[0040] In some embodiments of the present invention, R 11 represents a straight-chain alkyl group having 1-5 carbon atoms.

[0041] In some embodiments of the present invention, R 12 represents a straight-chain alkenyl group having 2-5 carbon atoms.

[0042] In some embodiments of the present invention, R2 represents a straight-chain alkyl group having 1-5 carbon atoms or a straight-chain alkoxy group having 1-5 carbon atoms.

[0043] In some embodiments of the present invention, it is preferred to adjust the content of the compound of general formula I such that the liquid crystal composition containing the same has a higher clearing point, a lower rotational viscosity, a larger absolute value of dielectric anisotropy, a lower refractive index, better low-temperature storage stability, and better low-temperature miscibility.

[0044] In some embodiments of the present invention, the weight percentage of the compound of general formula I in liquid crystal composition A is 0.1% - 75% (including any value or sub-range within this range), for example, 0.1%, 1%, 3%, 4%, 5%, 6%, 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%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 74%, 75%, or the range between any two of these values. Preferably, the weight percentage of the compound of general formula I in liquid crystal composition A is 1% - 60%.

[0045] In some embodiments of the present invention, the weight percentage of the compound containing at least one (for example, one, two, three, four, or five) compound selected from the group consisting of the compound of general formula I-1 and the compound of general formula I-4 in liquid crystal composition A is 1% - 60% (including any value or sub-range within this range), for example, 1%, 3%, 4%, 5%, 6%, 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%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, or the range between any two of these values.

[0046] In some embodiments of the present invention, the compound(s) comprising at least one (e.g., one, two, three, four, or five) compound(s) selected from the group consisting of the compound of general formula I-1-1, the compound of general formula I-1-2, the compound of general formula I-4-1-1, and the compound of general formula I-4-1-2 accounts for 1% - 55% (including any value or sub-range within this range) by weight of the liquid crystal composition A. For example, 1%, 3%, 4%, 5%, 6%, 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%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, or the range between any two of these values.

[0047] In some embodiments of the present invention, the percentage by weight of the liquid crystal composition A in the dye liquid crystal composition is 90% - 99.3% (including any value or sub-range within this range). For example, 90%, 91%, 92%, 93%, 94%, 94.1%, 94.2%, 94.3%, 94.4%, 94.5%, 94.6%, 94.7%, 94.8%, 94.9%, 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%, 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 the range between any two of these values. Preferably, the percentage by weight of the liquid crystal composition A in the dye liquid crystal composition is 94% - 99%.

[0048] In some embodiments of the present invention, the dichroic dye of the present invention is selected from any one or more dyes selected from the group consisting of azo dyes, anthraquinone dyes, phthalocyanine dyes, cyanine dyes, indigo dyes, methine dyes, nitro dyes, and nitroso dyes.

[0049] In some embodiments of the present invention, the dichroic dye of the present invention is selected from any one or more dyes in the group consisting of azo dyes and anthraquinone dyes.

[0050] In some embodiments of the present invention, the dichroic dye of the present invention is selected from any one or more (for example, two, three, four, or five) combinations of the following compounds:

[0051]

[0052]

[0053]

[0054]

[0055] In the present invention, dichroic dyes exhibit different absorption characteristics for the visible spectrum according to their different structures. A single dichroic dye mainly absorbs light of a specific wavelength, and the color shown is the complementary color of the transmitted light. It is difficult to achieve black with a single dye. Therefore, multiple dyes need to be mixed to absorb light of multiple wavelengths, and then, according to the sensitivity of the human eye to light, uniform absorption in the visible light band is achieved, which is called black. For a liquid crystal light modulation device containing dichroic dyes, in the visible light band, the more uniform the absorption of light of different wavelengths by the liquid crystal composition, the better the display effect of the display device. Therefore, for the combination of multiple dichroic dyes, an appropriate ratio needs to be selected.

[0056] In some embodiments of the present invention, the dichroic dye of the present invention is selected from any one or more (for example, two, three, four, or five) in 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 contains at least one (for example, one, two, three, four, or five) dichroic dye selected from the group consisting of the blue dyes, blue-green dyes, and / or blue-violet dyes numbered 1-19 as described above; the second type of dichroic dye contains at least one (for example, one, two, three, four, or five) dichroic dye selected from the group consisting of the purple dyes and / or magenta dyes numbered 20-27 as described above; the third type of dichroic dye contains at least one (for example, one, two, three, four, or five) dichroic dye selected from the group consisting of the orange-yellow dyes numbered 28-31 as described above.

[0057] In some embodiments of the present invention, the weight percentages of the first type of dichroic dye, the second type of dichroic dye, and the third type of dichroic dye in the dye liquid crystal composition are: (8 - 12):(1 - 4):(2 - 5) (including any value or sub-range 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); preferably, the weight percentages of the first type of dichroic dye, the second type of dichroic dye, and the third type of dichroic dye in the dye liquid crystal composition are: (10 - 12):(1 - 3):(2 - 4), and more preferably, 10:2:3..

[0058] In some embodiments of the present invention, the first type of dichroic dye of the present invention includes any one or more (for example, two, three, four, or five) of the group consisting of the dye numbered 1, the dye numbered 4, the dye numbered 5, the dye numbered 11, and the dye numbered 15.

[0059] In some embodiments of the present invention, the second type of dichroic dye of the present invention includes any one or more (for example, two, three, four, or five) of the group consisting of the dye numbered 21, the dye numbered 24, the dye numbered 25, the dye numbered 26, and the dye numbered 27.

[0060] In some embodiments of the present invention, the third type of dichroic dye of the present invention includes any one or more (for example, two, three, or four) of the group consisting of the dye numbered 28, the dye numbered 29, the dye numbered 30, and the dye numbered 31.

[0061] In some embodiments of the present invention, the dichroic dye of the present invention further contains any one or more (for example, two, three, four, or five) combinations of the following compounds:

[0062]

[0063]

[0064] In some embodiments of the present invention, the weight percentage of the dichroic dye in the dye liquid crystal composition is 0.01% - 10% (including any value or sub-range within this range), for example, 0.01%, 0.05%, 0.1%, 0.5%, 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%, 3.1%, 3.2%, 3.3%, 3.4%, 3.5%, 3.6%, 3.7%, 3.8%, 3.9%, 4%, 4.2%, 4.4%, 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 the range between any two of these values. Preferably, the weight percentage of the dichroic dye in the dye liquid crystal composition is 0.01% - 6%.

[0065] In some embodiments of the present invention, the weight percentage of the first type of dichroic dye in the dye liquid crystal composition is 0.01% - 4% (including any value or sub-range within this range), 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%, 3.1%, 3.2%, 3.3%, 3.4%, 3.5%, 3.6%, 3.7%, 3.8%, 3.9%, 4%, or the range between any two of these values. Preferably, the weight percentage of the first type of dichroic dye in the dye liquid crystal composition is 0.01% - 3.5%.

[0066] In some embodiments of the present invention, the percentage by weight of any one or more of the first class of dichroic dyes in the group consisting of the dye numbered 1, the dye numbered 4, the dye numbered 5, the dye numbered 11, and the dye numbered 15 in the dye liquid crystal composition is 0.01% - 3% (including any value or sub-range within this range), for example, 0.01%, 0.05%, 0.1%, 0.4%, 0.5%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.23%, 1.27%, 1.3%, 1.33%, 1.37%, 1.4%, 1.43%, 1.47%, 1.5%, 1.53%, 1.57%, 1.6%, 1.63%, 1.67%, 1.7%, 1.73%, 1.77%, 1.8%, 1.83%, 1.87%, 1.9%, 1.93%, 1.97%, 2%, 2.03%, 2.07%, 2.1%, 2.13%, 2.17%, 2.2%, 2.23%, 2.27%, 2.3%, 2.33%, 2.27%, 2.4%, 2.43%, 2.47%, 2.5%, 2.53%, 2.57%, 2.6%, 2.63%, 2.67%, 2.7%, 2.73%, 2.77%, 2.8%, 2.83%, 2.87%, 2.9%, 2.93%, 3%, or the range between any two of these values.

[0067] In some embodiments of the present invention, the percentage by weight of the second class of dichroic dyes in the dye liquid crystal composition is 0.01% - 3% (including any value or sub-range within this range), 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 the range between any two of these values. Preferably, the percentage by weight of the second class of dichroic dyes in the dye liquid crystal composition is 0.01% - 1%.

[0068] In some embodiments of the present invention, the percentage by weight of the second type of dichroic dye, which is any one or more of the dyes numbered 21, 24, 25, 26, and 27, in the dye liquid crystal composition is 0.01% - 1% (including any value or sub-range within this range), for example, 0.01%, 0.05%, 0.1%, 0.15%, 0.2%, 0.23%, 0.25%, 0.27%, 0.3%, 0.33%, 0.35%, 0.37%, 0.4%, 0.43%, 0.45%, 0.47%, 0.5%, 0.53%, 0.55%, 0.57%, 0.6%, 0.63%, 0.65%, 0.67%, 0.7%, 0.75%, 0.8%, 0.85%, 0.9%, 0.95%, 1%, or the range between any two of these values.

[0069] In some embodiments of the present invention, the percentage by weight of the third type of dichroic dye in the dye liquid crystal composition is 0.01% - 3% (including any value or sub-range within this range), 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 the range between any two of these values. Preferably, the percentage by weight of the third type of dichroic dye in the dye liquid crystal composition is 0.01% - 1.5%.

[0070] In some embodiments of the present invention, the percentage by weight of the third type of dichroic dye, which is any one or more of the dyes numbered 28, 29, 30, and 31, in the dye liquid crystal composition is 0.01% - 1.5% (including any value or sub-range within this range), for example, 0.01%, 0.05%, 0.1%, 0.15%, 0.2%, 0.22%, 0.25%, 0.28%, 0.3%, 0.32%, 0.35%, 0.38%, 0.4%, 0.42%, 0.45%, 0.48%, 0.5%, 0.52%, 0.55%, 0.58%, 0.6%, 0.62%, 0.65%, 0.68%, 0.7%, 0.72%, 0.75%, 0.78%, 0.8%, 0.82%, 0.85%, 0.88%, 0.9%, 0.95%, 1%, 1.1%, 1.15%, 1.2%, 1.25%, 1.3%, 1.35%, 1.4%, 1.45%, 1.5%, or the range between any two of these values.

[0071] 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:

[0072]

[0073] wherein, R M1 and R M2 each independently represents a straight-chain or branched-chain alkyl group containing 1 - 12 (such as 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, one or more non-adjacent -CH2- in the straight-chain or branched-chain alkyl group containing 1 - 12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO- respectively;

[0074] ring ring and ring each independently represents wherein one or more -CH2- in it may be replaced by -O-, and one or at most two single bonds in one or more of the rings may be replaced by double bonds, at most one -H in it may be replaced by a halogen;

[0075] Z M1 and Z M2 each independently represents a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -CH2CH2-, or -(CH2)4-;

[0076] n M represents 0, 1, 2, or 3; wherein when n M = 2 or 3, the rings may be the same or different, and Z M2 may be the same or different.

[0077] In some embodiments of the present invention, R M1 and R M2 each independently represent a straight-chain alkyl group having 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched-chain alkyl group having 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms, a straight-chain alkoxy group having 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched-chain alkoxy group having 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms, a straight-chain alkenyl group having 2-8 (e.g., 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched-chain alkenyl group having 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms,

[0078] In some embodiments of the present invention, either one of R M1 and R M2 is a straight-chain alkoxy group having 1-8 carbon atoms, a branched-chain alkoxy group having 3-8 carbon atoms, a straight-chain alkenyl group having 2-8 carbon atoms, or a branched-chain alkenyl group having 3-8 carbon atoms, and the other is a straight-chain alkyl group having 1-8 carbon atoms or a branched-chain alkyl group having 3-8 carbon atoms.

[0079] In some embodiments of the present invention, the compound of general formula M comprises at least one (e.g., one, two, three, four, or five) compound selected from the group consisting of at least one (e.g., one, two, three, four, or five) of the following compounds:

[0080]

[0081]

[0082]

[0083]

[0084]

[0085] and

[0086]

[0087] wherein, RM1 and R M2 each independently represents a straight-chain alkyl group having 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched-chain alkyl group having 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms, a straight-chain alkoxy group having 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched-chain alkoxy group having 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms, a straight-chain alkenyl group having 2-8 (e.g., 2, 3, 4, 5, 6, 7, or 8) carbon atoms, or a branched-chain alkenyl group having 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms.

[0088] In some embodiments of the present invention, in order to obtain a higher clearing point, a lower rotational viscosity, 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., one, two, three, four, or five) compound selected from the group consisting of at least one (e.g., one, two, three, four, or five) of the following compounds:

[0089]

[0090] and

[0091]

[0092] wherein,

[0093] R M1 and R M2 each independently represents a straight-chain alkyl group having 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms or a branched-chain alkyl group having 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms;

[0094] R M11 and R M21 each independently represents a straight-chain alkenyl group having 2-8 (e.g., 2, 3, 4, 5, 6, 7, or 8) carbon atoms or a branched-chain alkenyl group having 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms;

[0095] R M22 represents a straight-chain alkoxy group having 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms or a branched-chain alkoxy group having 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms.

[0096] In some embodiments of the present invention, it is preferred to adjust the content of the compound of general formula M such that the liquid crystal composition containing it has a higher clearing point, a lower rotational viscosity, a larger absolute value of dielectric anisotropy, a lower refractive index, better low-temperature storage stability, and better low-temperature miscibility.

[0097] In some embodiments of the present invention, the weight percentage of the compound of general formula M in the liquid crystal composition A is 0.1% - 80% (including any value or sub-range within this range), for example, 0.1%, 1%, 2%, 3%, 4%, 6%, 8%, 9%, 10%, 12%, 14%, 16%, 18%, 20%, 21%, 22%, 24%, 25%, 26%, 27%, 28%, 30%, 31%, 32%, 34%, 36%, 37%, 38%, 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 the range between any two of these values. Preferably, the weight percentage of the compound of general formula M in the liquid crystal composition A is 0.1% - 65%.

[0098] In some embodiments of the present invention, in order to obtain a higher clearing point, a lower rotational viscosity, 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 contains at least one (for example, two, three, four, five, or six) compounds selected from the group consisting of at least one (for example, one, two, three, four, five, six, or seven) of the compounds of general formula M-1, general formula M-5, general formula M-22, general formula M-40, general formula M-46, general formula M-52, and general formula M-58. The weight percentage of the above compounds in the liquid crystal composition A is 0.1% - 60% (including any value or sub-range within this range), for example, 0.1%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 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 the range between any two of these values.

[0099] In some embodiments of the present invention, the compound(s) comprising at least one (e.g., one, two, three, four, five, or six) selected from the group consisting of compounds of general formula M-1-1, compounds of general formula M-1-3, compounds of general formula M-1-4, compounds of general formula M-5-2, compounds of general formula M-22-1, compounds of general formula M-22-3, compounds of general formula M-40, compounds of general formula M-46, compounds of general formula M-52, and compounds of general formula M-58, and at least one (e.g., one, two, three, four, five, six, seven, eight, nine, or ten) thereof, accounts for 1% - 55% (including any value or sub-range within this range) by 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%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 44%, 46%, 48%, 50%, 51%, 52%, 54%, 55%, or the range between any two of these values.

[0100] 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 B:

[0101]

[0102] Wherein, R B1 and R B2 each independently represents a straight-chain or branched-chain alkyl group containing 1 - 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, one or more non-adjacent -CH2- in the straight-chain or branched-chain alkyl group containing 1 - 12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-;

[0103] Ring and Ring each independently represents Wherein, one or more -CH2- therein may be replaced by -O-, and one or at most two single bonds may be replaced by double bonds;

[0104] Z B1 、Z B2Each independently represents a single bond, -CH2CH2-, -(CH2)3-, -(CH2)4-, -CF2CF2-, -CO-O-, -O-CO-, -O-CO-O-, -C≡C-, -CH=CH-, -CF=CF-, -CH2O-, -OCH2- or -CF2O-.

[0105] n B1 and n B2 Each independently represents 0, 1, or 2, where when n B1 = 2, the rings can be the same or different, and Z B1 can be the same or different; when n B2 = 2, the rings can be the same or different, and Z B2 can be the same or different.

[0106] In some embodiments of the present invention, R B1 and R B2 Each independently represents a straight-chain alkyl group having 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched-chain alkyl group having 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms, a straight-chain alkoxy group having 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched-chain alkoxy group having 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms, a straight-chain alkenyl group having 2-8 (e.g., 2, 3, 4, 5, 6, 7, or 8) carbon atoms, or a branched-chain alkenyl group having 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms.

[0107] In some embodiments of the present invention, Z B1 represents a single bond or -CH=CH-.

[0108] In some embodiments of the present invention, Z B2 represents a single bond, -CH2O-, -CH2CH2-, or -CO-O-.

[0109] In some embodiments of the present invention, the compound of general formula B comprises at least one (e.g., one, two, three, four, or five) compound selected from the group consisting of at least one (e.g., one, two, three, four, or five) of the following compounds:

[0110]

[0111]

[0112] and

[0113]

[0114] In some embodiments of the present invention, in order to obtain a higher clearing point, a lower rotational viscosity, a larger absolute value of dielectric anisotropy, a lower refractive index, better low-temperature storage stability, and better low-temperature miscibility, the compound of formula B comprises at least one (e.g., one, two, three, four, or five) compound selected from the group consisting of the compounds of formula B-1 and the compounds of formula B-6.

[0115] In some embodiments of the present invention, in order to obtain a higher clearing point, a lower rotational viscosity, a larger absolute value of dielectric anisotropy, a lower refractive index, better low-temperature storage stability, and better low-temperature miscibility, the compound of formula B comprises at least one (e.g., one, two, three, four, or five) compound selected from the group consisting of at least one of the following (e.g., one, two, three, or four) compounds:

[0116]

[0117] and

[0118]

[0119] wherein, R B11 represents a straight-chain alkyl group having 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms or a branched-chain alkyl group having 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms;

[0120] R B12 represents a straight-chain alkenyl group having 2-8 (e.g., 2, 3, 4, 5, 6, 7, or 8) carbon atoms or a branched-chain alkenyl group having 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms;

[0121] R B2 represents a straight-chain alkyl group having 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, a branched-chain alkyl group having 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms, a straight-chain alkoxy group having 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7, or 8) carbon atoms, or a branched-chain alkoxy group having 3-8 (e.g., 3, 4, 5, 6, 7, or 8) carbon atoms.

[0122] In some embodiments of the present invention, it is preferred to adjust the content of the compound of formula B such that the liquid crystal composition containing the same has a higher clearing point, a lower rotational viscosity, a larger absolute value of dielectric anisotropy, a lower refractive index, better low-temperature storage stability, and better low-temperature miscibility.

[0123] In some embodiments of the present invention, the weight percentage of the compound of general formula B in the liquid crystal composition A is 0.1% - 80% (including any value or sub-range within this range), for example, 0.1%, 1%, 2%, 3%, 4%, 6%, 8%, 9%, 10%, 12%, 14%, 16%, 18%, 20%, 21%, 22%, 24%, 25%, 26%, 27%, 28%, 30%, 31%, 32%, 34%, 36%, 37%, 38%, 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 the range between any two of these values. Preferably, the weight percentage of the compound of general formula B in the liquid crystal composition A is 0.1% - 65%.

[0124] In some embodiments of the present invention, the weight percentage of the compound comprising at least one (e.g., one, two, three, four, or five) compound selected from the group consisting of the compounds of general formula B-1 and the compounds of general formula B-6 in the liquid crystal composition A is 1% - 65% (including any value or sub-range within this range), for example, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 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%, 61%, 62%, 64%, 65%, or the range between any two of these values.

[0125] In some embodiments of the present invention, the compound(s) comprising at least one (e.g., one, two, three, four, or five) selected from the group consisting of compounds of general formula B-1-1, compounds of general formula B-1-2, compounds of general formula B-6-1, and compounds of general formula B-6-2 (e.g., one, two, three, or four) accounts for 1% - 60% (including any value or sub-range within this range) by 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%, 26%, 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 the range between any two of these values.

[0126] 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:

[0127]

[0128] Wherein, R N1 and R N2 each independently represents a straight-chain or branched-chain alkyl group containing 1 - 12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12) carbon atoms, one or more non-adjacent -CH2- in the straight-chain or branched-chain alkyl group containing 1 - 12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O-, or -O-CO-;

[0129] Ring Ring each independently represents Wherein, one or more -CH2- therein may be replaced by -O-, one or at most two single bonds in the ring may be replaced by double bonds, wherein one or more -H therein may be replaced by a halogen, and one or more -CH= may be replaced by -N=;

[0130] Z N1 and Z N2each independently represents a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -C≡C-, -CH2CH2-, -(CH2)4-, -CF2CF2-, -CF2O- or -OCF2-;

[0131] L N1 and L N2 each independently represents -H, a halogen, a straight-chain or branched alkyl group having 1-3 (e.g., 1, 2 or 3) carbon atoms or a straight-chain or branched alkoxy group having 1-3 (e.g., 1, 2 or 3) carbon atoms; and

[0132] n N1 represents 0, 1, 2 or 3; n N2 represents 0 or 1; and 0 ≤ n N1 + n N2 ≤ 3; wherein, when n N1 = 2 or 3, the rings may be the same or different, and Z N1 may be the same or different.

[0133] In some embodiments of the present invention, the R N1 and R N2 each independently represents a straight-chain alkyl group having 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms, a branched alkyl group having 3-8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms, a straight-chain alkoxy group having 1-8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms, a branched alkoxy group having 3-8 (e.g., 1, 2, 3, 4, 5, 6, 7 or 8) carbon atoms, a straight-chain alkenyl group having 2-8 (e.g., 2, 3, 4, 5, 6, 7 or 8) carbon atoms or a branched alkenyl group having 3-8 (e.g., 3, 4, 5, 6, 7 or 8) carbon atoms.

[0134] In some embodiments of the present invention, preferably, L N1 and L N2 both represent -H.

[0135] In some embodiments of the present invention, the compound of general formula N comprises at least one (e.g., two, three, four or five) of the group consisting of at least one (e.g., one, two, three, four or five) of the following compounds:

[0136]

[0137]

[0138]

[0139]

[0140]

[0141] and

[0142]

[0143] In some embodiments of the present invention, in order to obtain a higher clearing point, a lower rotational viscosity, 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 comprises at least one (e.g., one, two, three, four, or five) compound selected from the group consisting of at least one (e.g., one, two, three, four, five, or six) of the compounds of general formula N-2, general formula N-3, general formula N-5, general formula N-6, general formula N-25, and general formula N-37.

[0144] In some embodiments of the present invention, it is preferred to adjust the content of the compound of general formula N such that the liquid crystal composition containing it has a higher clearing point, a lower rotational viscosity, a larger absolute value of dielectric anisotropy, a lower refractive index, better low-temperature storage stability, and better low-temperature miscibility.

[0145] In some embodiments of the present invention, the weight percentage of the compound of general formula N in the liquid crystal composition A is 0.1%-50% (including any value or sub-range within this range), e.g., 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%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, or the range between any two of these values. Preferably, the weight percentage of the compound of general formula B in the liquid crystal composition A is 1%-40%.

[0146] In some embodiments of the present invention, at least one (e.g., one, two, three, four, five, or six) compound selected from the group consisting of at least one (e.g., one, two, three, four, five, or six) of the compounds of general formula N-2, general formula N-3, general formula N-5, general formula N-6, general formula N-25, and general formula N-37 accounts for 1% - 35% (including any value or sub-range 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%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, or the range between any two of these values.

[0147] In some embodiments of the present invention, the dye liquid crystal composition of the present invention further comprises at least one chiral agent selected from any one or more (e.g., two, three, four, or five) of the following compounds in combination:

[0148]

[0149]

[0150]

[0151] and

[0152]

[0153] wherein, * represents a chiral site.

[0154] In some embodiments of the present invention, in order to obtain a higher clearing point, lower rotational viscosity, larger absolute value of dielectric anisotropy, lower refractive index, better low-temperature storage stability, and better low-temperature miscibility, the chiral agent of the present invention comprises at least one selected from the group consisting of at least one (e.g., one, two, three, four, or five) of the 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.

[0155] In some embodiments of the present invention, the chiral agent accounts for 0.01% - 10% by weight of the dye liquid crystal composition (including any value or sub-range within this range), 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%, 2.1%, 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 the range between any two of these values. Preferably, the chiral agent accounts for 0.01% - 4% by weight of the dye liquid crystal composition.

[0156] In the dye liquid crystal composition provided by the present invention, a compound of general formula I with a specific structure and a dichroic dye are compounded in specific contents, so that the dye liquid crystal composition containing the same has a relatively high clearing point, a relatively low rotational viscosity, a relatively large absolute value of dielectric anisotropy, a relatively low refractive index, good low-temperature storage stability, and good low-temperature miscibility, and enables the liquid crystal light modulation device containing the same to have good contrast, a relatively wide temperature usage range, good stability, a relatively fast response speed, and low dispersion, and can enable the liquid crystal light modulation device to have less glare phenomenon in light modulation applications.

[0157] In some embodiments of the present invention, the dye liquid crystal composition of the present invention further contains additives such as antioxidants, light stabilizers, and ultraviolet absorbers.

[0158] In some embodiments of the present invention, the additives such as antioxidants, light stabilizers, and ultraviolet absorbers are preferably the following substances:

[0159]

[0160]

[0161]

[0162] Wherein, n represents a positive integer from 1 to 12, n2 represents a positive integer from 3 to 5, " +” represents a free radical.

[0163] In some embodiments of the present invention, the additive of the present invention accounts for 0.01% - 5% (including any value or sub - range within this range) of the weight 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 of the dye - liquid crystal composition.

[0164] In a second aspect, the present invention provides a liquid - crystal light - modulating device comprising the dye - liquid crystal composition described in the first aspect.

[0165] The liquid - crystal device of the present invention is preferably adapted to regulate the transfer of energy in the form of daylight from the environment into an interior space. The energy transfer to be regulated occurs here from the environment (i.e., the external space) into the interior space.

[0166] The interior space can here be any desired space substantially isolated from the environment, such as a building, the transportation field, or a container.

[0167] The liquid - crystal light - modulating device described in the present invention can also be used to regulate the incidence of light on the eyes, such as in a sun visor, sunglasses, or goggles, where the device keeps the incidence of light on the eyes low in one switching state and reduces the incidence of light to a lesser extent in another switching state.

[0168] The liquid - crystal light - modulating device described in the present invention is preferably adapted to regulate the energy in the form of daylight from the environment through to the interior space and can be applied in buildings, the transportation field, or containers, etc.

[0169] The liquid - crystal light - modulating device described in the present invention is switchable. Switching here refers to changing the passage of energy through the device. The liquid - crystal light - modulating device of the present invention is preferably electrically switchable. However, the device can also be thermally switchable.

[0170] In the case where the liquid - crystal light - modulating device described in the present invention is electrically switchable, the switching operation is performed by applying a voltage to (re)orient the liquid - crystal material.

[0171] In some embodiments of the present invention, the liquid - crystal light - modulating device cell is a negative - type liquid - crystal cell.

[0172] In some embodiments of the present invention, the liquid crystal light modulating device is transformed from a state with low absorption rate (i.e., high light transmittance) (which exists without voltage) to a state with higher absorption rate (i.e., lower light transmittance) (which exists when voltage is applied). The liquid crystal material of the dye liquid crystal layer is preferably nematic in both states. The voltage-free state is preferably characterized in that the liquid crystal material of the dye liquid crystal material layer is aligned perpendicular to the plane of the dye liquid crystal layer. The state with voltage applied is preferably characterized in that the liquid crystal material of the dye liquid crystal layer is parallel to the plane of the dye liquid crystal layer.

[0173] The liquid crystal light modulating device of the present invention includes at least one liquid crystal cell, such as a single cell, a double-cell stack, a triple-cell stack, a quadruple-cell stack, etc.

[0174] In some embodiments of the present invention, the liquid crystal light modulating device of the present invention preferably adopts a single-cell or double-cell stack scheme.

[0175] In some embodiments of the present invention, the single-cell liquid crystal device of the present invention sequentially includes 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 from bottom to top, and the rubbing directions of the first alignment layer and the second alignment layer are parallel.

[0176] In some embodiments of the present invention, the double-cell liquid crystal device of the present invention includes a first liquid crystal device cell and a second liquid crystal device cell, and from bottom to top are the first liquid crystal device cell and the second liquid crystal device cell; wherein the first liquid crystal device cell sequentially includes 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 from bottom to top, and the rubbing directions of the first alignment layer and the second alignment layer are parallel; the second liquid crystal device cell sequentially includes 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 from bottom to top, and the rubbing directions of the third alignment layer and the fourth alignment layer are parallel.

[0177] In some embodiments of the present invention, in the double-cell liquid crystal device of the present invention, the positional relationship between the first liquid crystal device cell and the second liquid crystal device cell is: the second liquid crystal device cell is located above the first liquid crystal device cell, and the rubbing directions of the first liquid crystal device cell and the second liquid crystal device cell are perpendicular to each other.

[0178] The liquid crystal device of the present invention, wherein the dye liquid crystal material layer includes the dye liquid crystal composition as described in the first aspect.

[0179] In some embodiments of the present invention, the thickness range of the dye liquid crystal material layer of the present invention is 2 μm - 12 μm (including any value or sub-range within this range), for example, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm. Preferably, the thickness range of the dye liquid crystal material layer is 3 μm - 10 μm.

[0180] In some embodiments of the present invention, in the liquid crystal device of the present invention, the first alignment layer, the second alignment layer, the third alignment layer, and the fourth alignment layer are all preferably polyimide layers, and the first conductive layer, the second conductive layer, the third conductive layer, and the fourth conductive layer are all ITO conductive layers.

[0181] In some embodiments of the present invention, in the liquid crystal device 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 are in a vertical alignment.

[0182] According to the principle that the dichroic dye compound has a higher or lower light absorption coefficient according to the alignment with respect to the plane of polarization of light, the difference between the ordered and disordered states of the dichroic dye compound causes a difference in the transmittance of the switching layer of the device according to the present invention.

[0183] In the liquid crystal device of the present invention, under the induction of the alignment layer, in the non-powered state, the dye liquid crystal material is arranged perpendicular to the upper and lower substrates, and the incident light can pass through, thus presenting a transparent state; in the powered state, the dye liquid crystal material falls and arranges in a helix, and the dichroic dye molecules absorb the incident light, presenting a dark state, thereby realizing the modulation effect on the incident light.

[0184] In some embodiments of the present invention, in the application of the liquid crystal device, preferably, a large cell gap or a multi-cell stacking scheme is adopted.

[0185] In a third aspect, the present invention provides an application of a liquid crystal dimming device.

[0186] In some embodiments of the present invention, the present invention provides an application of a liquid crystal dimming device for dimming applications in application scenarios in the fields of architecture and transportation.

[0187] The numerical ranges described in the present invention not only include the above-listed point values, but also include any arbitrary point values between the above numerical ranges not listed. Due to space limitations and for the sake of brevity, the present invention does not exhaustively list the specific point values included in the ranges.

[0188] Compared with the prior art, the present invention has the following beneficial effects:

[0189] In the dye liquid crystal composition provided by the present invention, through the mutual compounding of the specific structures and contents of the compounds, while having a relatively high clearing point, a relatively low rotational viscosity, a relatively large absolute value of dielectric anisotropy, a relatively low refractive index, good low-temperature storage stability, and good low-temperature miscibility, the liquid crystal dimming device containing it has good contrast, a relatively wide temperature application range, good stability, a relatively fast response speed, and low dispersion, reducing the glare phenomenon in dimming fields such as architecture and transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0190] Figure 1 In the present invention, it is a schematic structural diagram of a single-cell liquid crystal device under the condition of not being powered on;

[0191] Among them, 1-1 is the first transparent substrate; 1-2 is the second transparent substrate; 2-1 is the first conductive layer; 2-2 is the second conductive layer; 3-1 is the first alignment layer; 3-2 is the second alignment layer; 4 is the dye liquid crystal material layer; 5 is the liquid crystal molecule; 6 is the dye molecule;

[0192] Figure 2 In the present invention, it is a schematic structural diagram of a single-cell liquid crystal device under the condition of being powered on;

[0193] Among them, 1-1 is the first transparent substrate; 1-2 is the second transparent substrate; 2-1 is the first conductive layer; 2-2 is the second conductive layer; 3-1 is the first alignment layer; 3-2 is the second alignment layer; 4 is the dye liquid crystal material layer; 5 is the liquid crystal molecule; 6 is the dye molecule;

[0194] Figure 3 In the present invention, it is a schematic structural diagram of a double-cell liquid crystal device under the condition of not being powered on;

[0195] Among them, 1-1 is the first transparent substrate; 1-2 is the second transparent substrate; 1-3 is the third transparent substrate; 1-4 is the fourth transparent substrate; 2-1 is the first conductive layer; 2-2 is the second conductive layer; 2-3 is the third conductive layer; 2-4 is the fourth conductive layer; 3-1 is the first alignment layer; 3-2 is the second alignment layer; 3-3 is the third alignment layer; 3-4 is the fourth alignment layer; 4-1 is the first dye liquid crystal material layer; 4-2 is the second dye liquid crystal material layer; 5 is the liquid crystal molecule; 6 is the dye molecule;

[0196] Figure 4 In the present invention, it is a schematic structural diagram of a double-cell liquid crystal device under the condition of being powered on.

[0197] Among them, 1-1 is the first transparent substrate; 1-2 is the second transparent substrate; 1-3 is the third transparent substrate; 1-4 is the fourth transparent substrate; 2-1 is the first conductive layer; 2-2 is the second conductive layer; 2-3 is the third conductive layer; 2-4 is the fourth conductive layer; 3-1 is the first alignment layer; 3-2 is the second alignment layer; 3-3 is the third alignment layer; 3-4 is the fourth alignment layer; 4-1 is the first dye liquid crystal material layer; 4-2 is the second dye liquid crystal material layer; 5 is the liquid crystal molecule; 6 is the dye molecule. Detailed implementation mode

[0198] The technical solution of the present invention will be further described below through specific implementation modes. Those skilled in the art should understand that the embodiments are only for helping to understand the present invention and should not be regarded as specific limitations on the present invention.

[0199] For the convenience of expression, in the following examples and comparative examples, the group structures of each compound are represented by the codes listed in Table 1:

[0200] Table 1

[0201]

[0202] Taking the compound with the following structural formula as an example:

[0203]

[0204] If this structural formula is represented by the codes listed in Table 1, it can be expressed as: nCCGF. The n in the code represents the number of C atoms of the alkyl group at the left end. For example, when n is "3", it means that the alkyl group is -C3H7; C in the code represents 1,4-cyclohexylene, G represents 2-fluoro-1,4-phenylene, and F represents fluorine.

[0205] The abbreviated codes for the test items in the following examples are as follows:

[0206] Cp Clearing point (transition temperature from nematic phase to isotropic phase, °C)

[0207] Δn Optical anisotropy (25 °C)

[0208] n o Refractive index of ordinary light (25 °C)

[0209] n e Refractive index of extraordinary light (25 °C)

[0210] Δn Optical anisotropy (25 °C)

[0211] ε ⊥ Dielectric constant in the direction perpendicular to the molecular axis

[0212] ε ∥Dielectric constant in the direction parallel to the molecular axis

[0213] Δη Dielectric anisotropy (1 kHz, 25 °C)

[0214] γ1 Rotational viscosity (mPa·s, 25 °C)

[0215] CR Contrast ratio (25 °C)

[0216] Ttrans (0 V) Transmittance in the on state (25 °C, %)

[0217] Tdark (10 V) Transmittance in the off state (25 °C, %)

[0218] Low-temperature storage at -20 °C Storage stability at -20 °C, h

[0219] Low-temperature storage at -30 °C Storage stability at -30 °C, h

[0220] Low-temperature storage at -40 °C Storage stability at -40 °C, h

[0221] Among them,

[0222] Cp: Obtained by testing with a melting point instrument.

[0223] Δη, n o and n e The detection method for is as follows: Using a DR-M2 multi-wavelength Abbe refractometer, insert the filter of the corresponding wavelength into the light source device to respectively test the n of the nematic liquid crystal at wavelengths of 450 nm, 546 nm, 589 nm, and 650 nm o and n o ; The corresponding Δη = n e - n o .

[0224] Δη: Δη = ε ∥ - ε ⊥ , where ε ∥ is the dielectric constant parallel to the molecular axis, and ε ⊥ is the dielectric constant perpendicular to the molecular axis; Test conditions: VA-type test cell at 25 °C, 1 kHz, and cell thickness of 6 μm.

[0225] γ1: Obtained by testing with an LCM-2 type liquid crystal physical property evaluation system; Test conditions: 25 °C, 160 - 240 V, and cell thickness of 20 μm.

[0226] The test method for low-temperature storage at -20 °C is as follows: Place the nematic liquid crystal medium in a glass bottle, store it at a constant temperature of -20 °C, and record the time when crystal precipitation is observed.

[0227] The test method for low-temperature storage at -30°C is as follows: Place the nematic liquid crystal medium in a glass bottle and store it at a constant temperature of -30°C. Record the time when crystal precipitation is observed.

[0228] The test method for low-temperature storage at -40°C is as follows: Place the nematic liquid crystal medium in a glass bottle and store it at a constant temperature of -40°C. Record the time when crystal precipitation is observed.

[0229] CR: Use an LS182 optical transmittance measuring instrument to measure the transmittance of the liquid crystal cell at 0V and 10V in the visible light band, namely T_transparent state and T_dark state, which is obtained from T_transparent state / T_dark state.

[0230] T_transparent state (0V): The transmittance when the test cell is not powered on.

[0231] T_dark state (10V): The transmittance when the test cell is powered on (square wave, 60Hz, 10V).

[0232] The compounds used in the following examples can all be synthesized by known methods or obtained through commercial channels. These synthesis techniques are conventional, and each dye liquid crystal composition obtained meets the standards for electronic compounds after testing.

[0233] Prepare the dye liquid crystal composition according to the ratio of each dye liquid crystal composition in the following examples. The preparation of the dye liquid crystal composition is carried out according to the conventional methods in the art, such as by heating, ultrasonic, suspension, etc. and mixing in accordance with the specified ratio.

[0234] Comparative Example 1

[0235] Prepare the liquid crystal composition B-1 of Comparative Example 1 by formulating each component listed in Table 2 and its weight percentage in the liquid crystal composition.

[0236] Table 2

[0237]

[0238]

[0239] Mix the dye No. 1 accounting for 1.67% by weight of the dye liquid crystal composition, the dye No. 24 accounting for 0.33% by weight of the dye liquid crystal composition, the dye No. 29 accounting for 0.50% by weight of the dye liquid crystal composition with the liquid crystal composition B-1 accounting for 97.50% by weight of the dye liquid crystal composition to obtain the dye liquid crystal composition M-d1.

[0240] Comparative Example 1 of the present invention is a dual-cell liquid crystal device, including a first liquid crystal device cell and a second liquid crystal device cell. From bottom to top, they are the first liquid crystal device cell and the second liquid crystal device cell in sequence. The first liquid crystal device cell 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 rubbing 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. The rubbing directions of the third alignment layer and the fourth alignment layer are parallel. Among them, the second liquid crystal device cell is located above the first liquid crystal device cell, and the rubbing directions of the first liquid crystal device cell and the second liquid crystal device cell are perpendicular to each other.

[0241] The dye liquid crystal composition M-d1 was filled into the first dye liquid crystal material layer and the second dye liquid crystal material layer respectively. The layer thicknesses of the first dye liquid crystal material layer and the second dye liquid crystal material layer are both 6 μm, and the polyimide layers of the first alignment layer, the second alignment layer, the third alignment layer, and the fourth alignment layer are vertically aligned. Performance tests were carried out on the liquid crystal device, and the test results are shown in Table 3.

[0242] Table 3

[0243]

[0244] Exemplarily, as listed in Table 3 for Δn, n e or n o The values indicate that at a wavelength of 650 nm, Δn is 0.0724, n e is 1.5455, and n o is 1.4731.

[0245] Comparative Example 2

[0246] The liquid crystal composition B-2 of Comparative Example 2 was prepared according to the components listed in Table 4 and their weight percentages in the liquid crystal composition.

[0247] Table 4

[0248]

[0249]

[0250] Dye No. 1 accounting for 1.73% by weight of the dye liquid crystal composition, Dye No. 24 accounting for 0.35% by weight of the dye liquid crystal composition, Dye No. 29 accounting for 0.52% by weight of the dye liquid crystal composition, chiral agent S811 accounting for 1.10% by weight of the dye liquid crystal composition are mixed with liquid crystal composition B-2 accounting for 96.30% by weight of the dye liquid crystal composition to obtain dye liquid crystal composition M-d2.

[0251] Comparative Example 2 of the present invention is a single-cell liquid crystal device, which sequentially includes 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 from bottom to top. Dye liquid crystal composition M-d2 is filled into the dye liquid crystal material layer, wherein the layer thickness of the dye liquid crystal material layer is 6 μm, and the polyimide layers of the first alignment layer and the second alignment layer are vertically aligned. Performance tests are carried out on the liquid crystal device, and the test results are shown in Table 5.

[0252] Table 5

[0253]

[0254] Example 1

[0255] The liquid crystal composition A-1 of Example 1 is prepared according to the components listed in Table 6 and their weight percentages in the liquid crystal composition A.

[0256] Table 6

[0257]

[0258]

[0259] Dye No. 1 accounting for 1.73% by weight of the dye liquid crystal composition, Dye No. 24 accounting for 0.35% by weight of the dye liquid crystal composition, Dye No. 29 accounting for 0.52% by weight of the dye liquid crystal composition, chiral agent S811 accounting for 1.10% by weight of the dye liquid crystal composition are mixed with liquid crystal composition A-1 accounting for 96.30% by weight of the dye liquid crystal composition to obtain dye liquid crystal composition M-1.

[0260] Example 1 of the present invention is a single-cell liquid crystal device. The structural schematic diagrams of the single-cell liquid crystal device when not powered on and when powered on are respectively as Figure 1 (not powered on) and Figure 2(Power-on) as shown; from bottom to top, it successively includes a first transparent substrate 1-1, a first conductive layer 2-1, a first alignment layer 3-1, a dye liquid crystal material layer 4, a second alignment layer 3-2, a second conductive layer 2-2, and a second transparent substrate 1-2. The dye liquid crystal composition M-1 is filled into the dye liquid crystal material layer, wherein the layer thickness of the dye liquid crystal material layer is 6 μm, and the polyimide layers of the first alignment layer and the second alignment layer are in vertical alignment. Performance tests are conducted on the liquid crystal device, and the test results are shown in Table 7.

[0261] Table 7

[0262]

[0263] Example 2

[0264] The liquid crystal composition A-2 of Example 2 is prepared by formulating each component listed in Table 8 and its weight percentage in the liquid crystal composition A.

[0265] Table 8

[0266]

[0267]

[0268] The dye numbered 1 accounting for 0.80% by weight of the dye liquid crystal composition, the dye numbered 24 accounting for 0.16% by weight of the dye liquid crystal composition, the dye numbered 29 accounting for 0.24% by weight of the dye liquid crystal composition, the chiral agent S811 accounting for 0.80% by weight of the dye liquid crystal composition, and the liquid crystal composition A-2 accounting for 98.00% by weight of the dye liquid crystal composition are mixed to obtain the dye liquid crystal composition M-2.

[0269] Example 2 of the present invention is a single-cell liquid crystal device, which successively includes 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 from bottom to top. The dye liquid crystal composition M-2 is filled into the dye liquid crystal material layer, wherein the layer thickness of the dye liquid crystal material layer is 9 μm, and the polyimide layers of the first alignment layer and the second alignment layer are in vertical alignment. Performance tests are conducted on the liquid crystal device, and the test results are shown in Table 9.

[0270] Table 9

[0271]

[0272] Example 3

[0273] The liquid crystal composition A-3 of Example 3 is prepared by formulating each component listed in Table 10 and its weight percentage in the liquid crystal composition A.

[0274] Table 10

[0275]

[0276]

[0277] Mix the dye No. 4 accounting for 1.73% by weight of the dye liquid crystal composition, the dye No. 21 accounting for 0.35% by weight of the dye liquid crystal composition, the dye No. 28 accounting for 0.52% by weight of the dye liquid crystal composition, the chiral agent S811 accounting for 0.80% by weight of the dye liquid crystal composition with the liquid crystal composition A-3 accounting for 96.60% by weight of the dye liquid crystal composition to obtain the dye liquid crystal composition M-3.

[0278] Example 3 of the present invention is a single-cell liquid crystal device, which successively includes 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 from bottom to top. The dye liquid crystal composition M-3 is filled into the dye liquid crystal material layer, wherein the layer thickness of the dye liquid crystal material layer is 9 μm, and the polyimide layers of the first alignment layer and the second alignment layer are vertically aligned. Performance tests are carried out on the liquid crystal device, and the test results are shown in Table 11.

[0279] Table 11

[0280]

[0281] Example 4

[0282] Prepare the liquid crystal composition A-4 of Example 4 according to the components listed in Table 12 and their weight percentages in the liquid crystal composition A.

[0283] Table 12

[0284]

[0285]

[0286] Mix the dye No. 11 accounting for 2.00% by weight of the dye liquid crystal composition, the dye No. 27 accounting for 0.40% by weight of the dye liquid crystal composition, the dye No. 29 accounting for 0.60% by weight of the dye liquid crystal composition, the chiral agent S811 accounting for 0.95% by weight of the dye liquid crystal composition with the liquid crystal composition A-4 accounting for 96.05% by weight of the dye liquid crystal composition to obtain the dye liquid crystal composition M-4.

[0287] Example 4 of the present invention is a single-cell liquid crystal device, which sequentially includes 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 from bottom to top. The dye liquid crystal composition M-4 is filled into the dye liquid crystal material layer, wherein the layer thickness of the dye liquid crystal material layer is 8 μm, and the polyimide layers of the first alignment layer and the second alignment layer are in vertical alignment. Performance tests were carried out on the liquid crystal device, and the test results are shown in Table 13.

[0288] Table 13

[0289]

[0290] Example 5

[0291] The liquid crystal composition A-5 of Example 5 was prepared according to the components listed in Table 14 and their weight percentages in the liquid crystal composition A.

[0292] Table 14

[0293]

[0294]

[0295] A dye liquid crystal composition M-5 was obtained by mixing a dye No. 5 accounting for 1.33% by weight of the dye liquid crystal composition, a dye No. 26 accounting for 0.27% by weight of the dye liquid crystal composition, a dye No. 31 accounting for 0.40% by weight of the dye liquid crystal composition, a chiral agent S811 accounting for 1.30% by weight of the dye liquid crystal composition, and a liquid crystal composition A-5 accounting for 96.7% by weight of the dye liquid crystal composition.

[0296] Example 5 of the present invention is a single-cell liquid crystal device, which sequentially includes 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 from bottom to top. The dye liquid crystal composition M-5 is filled into the dye liquid crystal material layer, wherein the layer thickness of the dye liquid crystal material layer is 6 μm, and the polyimide layers of the first alignment layer and the second alignment layer are in vertical alignment. Performance tests were carried out on the liquid crystal device, and the test results are shown in Table 15.

[0297] Table 15

[0298]

[0299] Example 6

[0300] The liquid crystal composition A-6 of Example 6 was prepared according to the components listed in Table 16 and their weight percentages in the liquid crystal composition A.

[0301] Table 16

[0302]

[0303]

[0304] Mix the dye No. 11 accounting for 2.00% by weight of the dye liquid crystal composition, the dye No. 27 accounting for 0.40% by weight of the dye liquid crystal composition, the dye No. 29 accounting for 0.60% by weight of the dye liquid crystal composition, the chiral agent S811 accounting for 1.00% by weight of the dye liquid crystal composition with the liquid crystal composition A-6 accounting for 96.00% by weight of the dye liquid crystal composition to obtain the dye liquid crystal composition M-6.

[0305] Example 6 of the present invention is a single-cell liquid crystal device, which sequentially includes 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 from bottom to top. The dye liquid crystal composition M-6 is filled into the dye liquid crystal material layer, wherein the layer thickness of the dye liquid crystal material layer is 7 μm, and the polyimide layers of the first alignment layer and the second alignment layer are vertically aligned. Performance tests are carried out on the liquid crystal device, and the test results are shown in Table 17.

[0306] Table 17

[0307]

[0308] Example 7

[0309] Prepare the liquid crystal composition A-7 of Example 7 according to the compounds listed in Table 18 and their weight percentages in the liquid crystal composition A.

[0310] Table 18

[0311] Component code Weight percentage General formula code 3CCO1 6 M-1-4 3CCV 4 M-1-3 3C(N)OW3 10 I-1-1 VCC(N)O2 10 B-1-2 VCC(N)O3 11 B-1-2 3CCEC3 3 M-40 4CCEC3 3 M-40 3CCEC5 3 M-40 3C(N)1OWO3 10 I-1-1 3C(N)1OWO2 4 I-1-1 4CCECC5 3 M-58 VCC(N)1OWO1 10 I-4-1-2 VCC(N)1OWO2 10 I-4-1-2 3CCWO2 4 N-5 3CWO2 6 N-2 3CCEPC3 3 M-52 Total 100

[0312] Mix the dye No. 1 accounting for 1.67% by weight of the dye liquid crystal composition, the dye No. 24 accounting for 0.33% by weight of the dye liquid crystal composition, the dye No. 29 accounting for 0.50% by weight of the dye liquid crystal composition with the liquid crystal composition A-7 accounting for 97.50% by weight of the dye liquid crystal composition to obtain the dye liquid crystal composition M-7.

[0313] Example 7 of the present invention is a double-cell liquid crystal device, including a first liquid crystal device cell and a second liquid crystal device cell. The structural schematic diagrams of the double-cell liquid crystal device in the non-powered and powered states are respectively as Figure 3 (non-powered) and Figure 4(Power on) as shown; from bottom to top are the first liquid crystal device cell and the second liquid crystal device cell in sequence; the first liquid crystal device cell includes, from bottom to top, a first transparent substrate 1-1, a first conductive layer 2-1, a first alignment layer 3-1, a first dye liquid crystal material layer 4-1, a second alignment layer 3-2, a second conductive layer 2-2, and a second transparent substrate 1-2, and the rubbing 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 1-3, a third conductive layer 2-3, a third alignment layer 3-3, a second dye liquid crystal material layer 4-2, a fourth alignment layer 3-4, a fourth conductive layer 2-4, and a fourth transparent substrate 1-4, and the rubbing directions of the third alignment layer and the fourth alignment layer are parallel; wherein, the second liquid crystal device cell is located above the first liquid crystal device cell, and the rubbing directions of the first liquid crystal device cell and the second liquid crystal device cell are perpendicular to each other.

[0314] The dye liquid crystal composition M-7 was filled into the first dye liquid crystal material layer and the second dye liquid crystal material layer respectively, wherein the layer thicknesses of the first dye liquid crystal material layer and the second dye liquid crystal material layer were both 6 μm, and the polyimide layers of the first alignment layer, the second alignment layer, the third alignment layer, and the fourth alignment layer were in vertical alignment. Performance tests were carried out on the liquid crystal device, and the test results are shown in Table 19.

[0315] Table 19

[0316]

[0317] Example 8

[0318] The liquid crystal composition A-8 of Example 8 was prepared by formulating the components listed in Table 20 and their weight percentages in the liquid crystal composition A.

[0319] Table 20

[0320]

[0321]

[0322] The dye No. 5 accounting for 1.87% by weight of the dye liquid crystal composition, the dye No. 26 accounting for 0.37% by weight of the dye liquid crystal composition, the dye No. 31 accounting for 0.56% by weight of the dye liquid crystal composition, and the liquid crystal composition A-8 accounting for 97.20% by weight of the dye liquid crystal composition were mixed to obtain the dye liquid crystal composition M-8.

[0323] Example 8 of the present invention is a dual-cell liquid crystal device, including a first liquid crystal device cell and a second liquid crystal device cell. From bottom to top, they are the first liquid crystal device cell and the second liquid crystal device cell in sequence. The first liquid crystal device cell 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 rubbing 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. The rubbing directions of the third alignment layer and the fourth alignment layer are parallel. Among them, the second liquid crystal device cell is located above the first liquid crystal device cell, and the rubbing directions of the first liquid crystal device cell and the second liquid crystal device cell are perpendicular to each other.

[0324] The dye liquid crystal composition M-8 is filled into the first dye liquid crystal material layer and the second dye liquid crystal material layer respectively. The layer thicknesses of the first dye liquid crystal material layer and the second dye liquid crystal material layer are both 9 μm, and the polyimide layers of the first alignment layer, the second alignment layer, the third alignment layer, and the fourth alignment layer are vertically aligned. The performance of the liquid crystal device is tested, and the test results are shown in Table 21.

[0325] Table 21

[0326]

[0327] Example 9

[0328] The liquid crystal composition A-9 of Example 9 is prepared by formulating the components listed in Table 22 and their weight percentages in the liquid crystal composition A.

[0329] Table 22

[0330]

[0331]

[0332] The dye with number 4 accounting for 2.67% by weight of the dye liquid crystal composition, the dye with number 21 accounting for 0.53% by weight of the dye liquid crystal composition, the dye with number 28 accounting for 0.80% by weight of the dye liquid crystal composition, the chiral agent S811 accounting for 1.55% by weight of the dye liquid crystal composition, and the liquid crystal composition A-9 accounting for 94.45% by weight of the total weight of the dye liquid crystal composition are mixed to obtain the dye liquid crystal composition M-9.

[0333] Example 9 of the present invention is a single-cell liquid crystal device, which sequentially includes 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 from bottom to top. The dye liquid crystal composition M-9 is filled into the dye liquid crystal material layer, wherein the layer thickness of the dye liquid crystal material layer is 5 μm, and the polyimide layers of the first alignment layer and the second alignment layer are vertically aligned. Performance tests were conducted on the liquid crystal device, and the test results are shown in Table 23.

[0334] Table 23

[0335]

[0336] Example 10

[0337] The liquid crystal composition A-10 of Example 10 was prepared according to the components listed in Table 24 and their weight percentages in the liquid crystal composition A.

[0338] Table 24

[0339]

[0340]

[0341] Dye No. 1 accounting for 2.13% by weight of the dye liquid crystal composition, dye No. 24 accounting for 0.43% by weight of the dye liquid crystal composition, dye No. 29 accounting for 0.64% by weight of the dye liquid crystal composition, chiral agent S811 accounting for 1.86% by weight of the dye liquid crystal composition were mixed with liquid crystal composition A-10 accounting for 94.94% by weight of the total weight of the dye liquid crystal composition to obtain the dye liquid crystal composition M-10.

[0342] Example 10 of the present invention is a single-cell liquid crystal device, which sequentially includes 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 from bottom to top. The dye liquid crystal composition M-10 is filled into the dye liquid crystal material layer, wherein the layer thickness of the dye liquid crystal material layer is 4 μm, and the polyimide layers of the first alignment layer and the second alignment layer are vertically aligned. Performance tests were conducted on the liquid crystal device, and the test results are shown in Table 25.

[0343] Table 25

[0344]

[0345] Example 11

[0346] The liquid crystal composition A-11 of Example 11 was prepared according to the components listed in Table 26 and their weight percentages in the liquid crystal composition A.

[0347] Table 26

[0348]

[0349]

[0350] Mix the dye No. 11 accounting for 0.89% by weight of the dye liquid crystal composition, the dye No. 27 accounting for 0.18% by weight of the dye liquid crystal composition, the dye No. 29 accounting for 0.27% by weight of the dye liquid crystal composition with the liquid crystal composition A-11 accounting for 98.66% by weight of the dye liquid crystal composition to obtain the dye liquid crystal composition M-11.

[0351] Example 11 of the present invention is a double-cell liquid crystal device, including a first liquid crystal device cell and a second liquid crystal device cell, which are, from bottom to top, the first liquid crystal device cell and the second liquid crystal device cell in sequence; 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 dye liquid crystal material layer, a second alignment layer, a second conductive layer and a second transparent substrate, and the rubbing 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 rubbing directions of the third alignment layer and the fourth alignment layer are parallel; wherein, the second liquid crystal device cell is located above the first liquid crystal device cell, and the rubbing directions of the first liquid crystal device cell and the second liquid crystal device cell are perpendicular to each other.

[0352] Fill the dye liquid crystal composition M-11 into the first dye liquid crystal material layer and the second dye liquid crystal material layer respectively. The layer thicknesses of the first dye liquid crystal material layer and the second dye liquid crystal material layer are both 9 μm, and the polyimide layers of the first alignment layer, the second alignment layer, the third alignment layer and the fourth alignment layer are in vertical alignment. Perform performance tests on the liquid crystal device, and the test results are shown in Table 27.

[0353] Table 27

[0354]

[0355] Example 12

[0356] Prepare the liquid crystal composition A-12 of Example 12 according to the components listed in Table 28 and their weight percentages in the liquid crystal composition.

[0357] Table 28

[0358]

[0359]

[0360] Mix dye No. 15 at 1.40% by weight of the dye liquid crystal composition, dye No. 25 at 0.28% by weight of the dye liquid crystal composition, dye No. 30 at 0.42% by weight of the dye liquid crystal composition with liquid crystal composition A-12 at 97.90% by weight of the dye liquid crystal composition to obtain dye liquid crystal composition M-12.

[0361] Example 12 of the present invention is a double-cell liquid crystal device, including a first liquid crystal device cell and a second liquid crystal device cell, which are, from bottom to top, the first liquid crystal device cell and the second liquid crystal device cell in sequence; 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 dye liquid crystal material layer, a second alignment layer, a second conductive layer and a second transparent substrate, and the rubbing 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 rubbing directions of the third alignment layer and the fourth alignment layer are parallel; wherein, the second liquid crystal device cell is located above the first liquid crystal device cell, and the rubbing directions of the first liquid crystal device cell and the second liquid crystal device cell are perpendicular to each other.

[0362] Fill the dye liquid crystal composition M-12 into the first dye liquid crystal material layer and the second dye liquid crystal material layer respectively, wherein the layer thicknesses of the first dye liquid crystal material layer and the second dye liquid crystal material layer are both 6 μm, and the polyimide layers of the first alignment layer, the second alignment layer, the third alignment layer and the fourth alignment layer are in vertical alignment. Perform performance tests on the liquid crystal device, and the test results are shown in Table 29.

[0363] Table 29

[0364]

[0365] From the comparison between the examples and comparative examples of the present application, it can be seen that through the optimization of the structure and content of the compound of general formula I and the mutual compounding of specific components and contents of the dye liquid crystal composition, the dye liquid crystal composition of the present invention has a relatively high clearing point (Cp: 70 - 141), a relatively low rotational viscosity (γ1: 95 - 131), a relatively large absolute value of dielectric anisotropy (Δε: -6.9 - -11.4), and has appropriate vertical dielectric (ε ⊥: (11.2 - 17.5), lower optical anisotropy (Δn at 650 nm wavelength is 0.0418 - 0.0722; Δn at 589 nm wavelength is 0.0412 - 0.0736; Δn at 546 nm wavelength is 0.042 - 0.0749; Δn at 450 nm wavelength is 0.043 - 0.0766), smaller difference in optical anisotropy at different wavelengths, and better low-temperature storage stability (-20 °C: >2000 h; -30 °C: >2000 h; -40 °C: >2000 h).

[0366] In summary, through the mutual compounding of the specific structure and content of the compound, the dye liquid crystal composition of the present invention has a high clearing point, low rotational viscosity, large absolute value of dielectric anisotropy, appropriate vertical dielectric, low refractive index, good low-temperature storage stability, and good low-temperature miscibility, while the liquid crystal dimming device containing it has good contrast, a wide temperature application range, good stability, fast response speed, and low dispersion, reducing the glare phenomenon in dimming fields such as architecture and transportation.

[0367] The applicant declares that the above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention fall within the protection scope and the disclosure scope of the present invention.

Claims

1. A dye liquid crystal composition, characterized in that, The dye liquid crystal composition contains at least one liquid crystal composition A and at least one dichroic dye; wherein, the liquid crystal composition A contains at least one compound of general formula I: wherein, R1 and R2 each independently represent a straight-chain or branched-chain alkyl group containing 1 to 12 carbon atoms, one or more non-adjacent -CH2- in the straight-chain or branched-chain alkyl group containing 1 to 12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO- respectively, and at most one -H in the straight-chain or branched-chain alkyl group containing 1 to 12 carbon atoms may be replaced by -F or -Cl; Ring represents wherein one or more of the -CH2- therein may be replaced by -O-, and single bonds in one or at most two rings may be replaced by double bonds; Z1 represents a single bond, -CH2CH2-, -(CH2)3-, -(CH2)4-, -CF2CF2-, -CO-O-, -O-CO-, -O-CO-O-, -C≡C-, -CH=CH-, -CF=CF-, -CH2O-, -OCH2- or -CF2O-; Z2 represents -CH2CH2-, -CF2CF2-, -CH=CH-, -CF=CF-, -CH2O-, -OCH2- or -CF2O-; n A1 selected from 0, 1 or 2, wherein when n A1 = 2, the rings may be the same or different, and Z1 may be the same or different; L1 and L2 each independently represent a halogen, -CN, -CF3 or -OCF3.

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

3. The dye liquid crystal composition according to claim 1, characterized in that, The compound of general formula I accounts for 0.1%-75% by weight of the liquid crystal composition A; the liquid crystal composition A accounts for 90%-99.3% by weight of the dye liquid crystal composition; the dichroic dye accounts for 0.01%-10% by 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 contains at least one compound of general formula M: Wherein, R M1 and R M2 each independently represents a straight-chain or branched-chain alkyl group having 1 to 12 carbon atoms, one or more non-adjacent -CH2- in the straight-chain or branched-chain alkyl group having 1 to 12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-; Ring Ring and Ring each independently represents wherein one or more of the -CH2- therein may be replaced by -O-, and the single bond in one or at most two rings may be replaced by a double bond, at most one -H therein may be replaced by a halogen; Z M1 and Z M2 each independently represents a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH=CH-, -CH2CH2- or -(CH2)4-; n M represents 0, 1, 2, or 3; wherein, when n M = 2 or 3, the rings may be the same or different, and Z M2 may be the same or different. The compound of general formula M accounts for 0.1%-80% by weight 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 contains at least one compound of general formula B; wherein, R B1 and R B2 each independently represents a straight-chain or branched-chain alkyl group having 1 to 12 carbon atoms, one or more non-adjacent -CH2- in the straight-chain or branched-chain alkyl group having 1 to 12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO- respectively; Ring and the ring each independently represents wherein one or more of the -CH2- therein may be replaced by -O-, and the single bond in one or at most two rings may be replaced by a double bond; Z B1 and Z B2 each independently represents a single bond, -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 independently represents 0, 1 or 2, where when n B1 = 2, the rings can be the same or different, and Z B1 can be the same or different; when n B2 = 2, the rings can be the same or different, and Z B2 can be the same or different; The compound of general formula B accounts for 0.1%-80% by weight 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 contains at least one compound of general formula N: Wherein, R N1 and R N2 each independently represent a straight-chain or branched-chain alkyl group having 1 to 12 carbon atoms, one or more non-adjacent -CH2- in the straight-chain or branched-chain alkyl group having 1 to 12 carbon atoms may be independently replaced by -CH=CH-, -C≡C-, -O-, -CO-, -CO-O- or -O-CO-; Ring Ring Each independently represents Wherein One or more of the -CH2- therein may be replaced by -O-, and the single bond in one or at most two rings may be replaced by a double bond, wherein One or more of the -H therein may be replaced by a halogen, and one or more of the -CH= may be replaced by -N=; Z N1 and Z N2 each independently represents a single bond, -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH═CH-, -C≡C-, -CH2CH2-, -(CH2)4-, -CF2CF2-, -CF2O- or -OCF2-; L N1 and L N2 each independently represents -H, a halogen, a straight-chain or branched alkyl group having 1 to 3 carbon atoms, or a straight-chain or branched alkoxy group having 1 to 3 carbon atoms, and n N1 represents 0, 1, 2, or 3; n N2 represents 0 or 1; and 0 ≤ n N1 + n N2 ≤ 3; wherein, when n N1 = 2 or 3, the rings can be the same or different, and Z N1 can be the same or different; The compound of general formula N accounts for 0.1%-50% by weight of the liquid crystal composition A.

7. The dye liquid crystal composition according to claim 1, characterized in that, The liquid crystal composition further contains at least one chiral agent, wherein the chiral agent is selected from any one or at least two combinations of the following compounds: and wherein, * represents a chiral site; The chiral agent accounts for 0.01%-10% by weight of the dye liquid crystal composition.

8. The dye liquid crystal composition according to claim 1, wherein The compound of general formula I contains at least one group consisting of at least one of the following compounds: and 9. A liquid crystal dimming device comprising the dye liquid crystal composition according to any one of claims 1-8, characterized in that, The liquid crystal light modulating device contains at least one liquid crystal cell.

10. Use of the liquid crystal light modulating device according to claim 9.

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