High-stability low-voltage driven liquid crystal dimming film

Abstract

The invention relates to a high-stability low-voltage driven liquid crystal dimming film, which is provided with a first conductive film, a liquid crystal dimming layer and a second conductive film, and is characterized in that the liquid crystal dimming layer is positioned between the first conductive film and the second conductive film and contains liquid crystal, polymer or ionic liquid; the mass of the polymer is not less than 30% of the total mass of the polymer and the liquid crystal, and the weight percentage of the total mass of the ionic liquid and the liquid crystal dimming layer is less than 2%. And by adding the ionic liquid, the driving voltage is reduced. Through a small proportion of ionic liquid, the breakdown risk is obviously reduced, and the stability of the liquid crystal dimming film is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of liquid crystal dimming film, more particularly, to a high-stability low-voltage driven liquid crystal dimming film. BACKGROUND

[0002] Liquid crystal dimming film is an intelligent dimming material based on liquid crystal technology. By changing the orientation of liquid crystal molecules through electric field, the arrangement control of liquid crystal molecules and the adjustment of light transmittance are realized.

[0003] Liquid crystal dimming film is composed of two layers of transparent conductive film and a polymer liquid crystal layer in the middle. The polymer liquid crystal layer is formed by curing prepolymers and liquid crystals. In the off state, the liquid crystal molecules are arranged disorderly, resulting in the inability of light to penetrate, and presenting a milky white opaque state. After power on, the liquid crystal molecules are rearranged under the action of electric field, allowing light to penetrate, and presenting a transparent state.

[0004] Liquid crystal dimming film can be applied in fields such as building glass, automobile windshield, commercial projection, medical equipment, etc. For example, in buildings, it can be used as intelligent curtains or heat insulation films; in automobiles, it can be used as privacy protection films or sunshade films. However, in order to achieve high contrast ratio and other requirements, a relatively high driving voltage needs to be applied, which limits the application of liquid crystal dimming film.

[0005] In order to realize low-voltage driving, various solutions are provided in the industry. One technical solution is to change the type or proportion of liquid crystal, such as increasing the content of liquid crystal or adding high-polarity liquid crystal to reduce the voltage. Another technical solution is to change the type or proportion of prepolymers, such as adding polymerizable liquid crystal or other bi-functional polymer monomers to reduce the voltage. However, since liquid crystal and polymer are matched to realize dimming effect, changing only one of them actually affects other properties of the dimming film. Since the liquid crystal of the dimming film is a formula composed of multiple liquid crystal monomers, and the prepolymers of the dimming film are a formula composed of polymer monomers, polymer oligomers, initiators and other components, changing one or both of them leads to the complexity of the dimming film formula, increasing the failure possibility. Another technical solution is to add other components, such as nanoparticles such as Fe3O4, TiO2, Fe2O3, Ag, Au, etc. Since inorganic system nanoparticles are incompatible with organic system liquid crystal or polymer, this leads to poor stability of the entire system.

[0006] Therefore, there is a lack of a technical solution that can achieve low-voltage driving while maintaining high stability. SUMMARY

[0007] To solve the above technical problems, the present application provides a high-stability low-voltage driven liquid crystal dimming film.

[0008] The application provides a high-stability low-voltage driven liquid crystal dimming film, which comprises a first conductive film, a liquid crystal dimming layer and a second conductive film, the liquid crystal dimming layer is located between the first conductive film and the second conductive film, the liquid crystal dimming layer contains liquid crystal, polymer or ionic liquid, the mass of the polymer is not less than 30% of the total mass of the polymer and the liquid crystal, and the weight percentage of the ionic liquid in the total mass of the liquid crystal dimming layer is less than 2%.

[0009] Preferably, the first conductive layer or the second conductive layer comprises at least one conductive layer and at least one base film, the conductive layer is composed of transparent conductive oxide or metal material, the base film is made of flexible polymer material, the transparent conductive oxide at least contains one of indium tin oxide, fluorine-doped tin dioxide or aluminum-doped zinc oxide, the metal material at least contains one of aluminum, copper or silver, and the flexible polymer at least contains one of polyethylene terephthalate, polyethylene naphthalate or polyimide.

[0010] Preferably, the transparent conductive oxide is indium tin oxide, and the flexible polymer is polyethylene terephthalate.

[0011] Preferably, the liquid crystal is nematic liquid crystal; the nematic liquid crystal contains at least one liquid crystal monomer represented by the following molecules: ; wherein X and Y each independently represent C1-C12 alkyl, alkoxy, cyano, isothiocyanate or halogen, ring A and ring B each independently represent benzene ring, pyridine ring or cyclohexane ring; m and n each independently represent an integer of 0-4; L is an alkyne bond, an olefin bond or an ester group; and a represents 0 or 1.

[0012] Preferably, the polymer contains at least one acrylic resin or epoxy resin, and contains at least one initiator; the mass of the polymer is 30%-70% of the total mass of the polymer and the liquid crystal; the initiator is a photoinitiator or a thermal initiator; the mass percentage of the initiator in the total mass of the liquid crystal dimming layer is 0.01-5%.

[0013] Preferably, the ionic liquid is one selected from the group consisting of a salt of organic cation and inorganic anion, a salt of inorganic cation and organic anion, or a salt of organic cation and organic anion.

[0014] The ionic liquid is a kind of organic salt composed of cation and anion in liquid state at room temperature, also known as room temperature ionic liquid. The ionic liquid has good stability, including thermal stability, which can maintain liquid state in a wide temperature range; chemical stability, which is not easy to react with other substances; electrochemical stability, which is not easy to react with other substances under the condition of electricity; and physical property stability, which maintains physical property stability in a large temperature range.

[0015] Preferably, the organic cation of the ionic liquid is an imidazolium, pyridinium, pyrrolidinium, piperidinium, pyrazolium, triazolium, quaternary ammonium, quaternary phosphonium or thiazolium organic cation, and the organic or inorganic anion is triflate, bistriflimide, hexafluorophosphate, tetrafluoroborate, methylsulfate, acetate, trifluoroacetate, bisfluorosulfonimide, methylsulfate, methylcarboxylate, chloride, bromide, iodide, fluoride, nitrate, sulfate, hydrogen sulfate, phosphate, decanoate or dicyanamide anion.

[0016] Preferably, the organic cation of the ionic liquid is selected from one of the following cations: 1-butyl-3-methylimidazolium, 1-propyl-3-methylimidazolium, 1-ethyl-3-methylimidazolium, 1-methyl-3-methylimidazolium, 1-methylimidazolium, 1-ethylimidazolium, 1-propylimidazolium, 1-butylimidazolium, 1-pentylimidazolium, 1-hexylimidazolium, 1-heptylimidazolium, 1-octylimidazolium, 1-nonylimidazolium, 1-decylimidazolium, 1-undecylimidazolium, 1-dodecylimidazolium, 1,3-diisopropylimidazolium, 1-vinyl-3-methylimidazolium, 1-allyl-3-methylimidazolium, 1-butylpyridinium, 1-propylpyridinium, 1-ethylpyridinium, 1-methylpyridinium, tetrabutylammonium, tetrapropylammonium, tetraethylammonium, tetramethylammonium, butyltriethylammonium, ethyltributylammonium, tetrabutylphosphonium, tetrapropylphosphonium, tetraethylphosphonium, tetramethylphosphonium, butyltriethylphosphonium, ethyltributylphosphonium, trihexyl(tetradecyl)phosphonium, N-ethyl-N-methylpyrrolidinium, N-propyl-N-methylpyrrolidinium, N-butyl-N-methylpyrrolidinium, N-hexyl-N-methylpyrrolidinium, N-octyl-N-methylpyrrolidinium, N-ethyl-N-methylpiperidinium, N-propyl-N-methylpiperidinium, N-butyl-N-methylpiperidinium, N-hexyl-N-methylpiperidinium or N-octyl-N-methylpiperidinium.

[0017] As for the ionic liquid, its cation can be one or more, and its anion can be one or more, as long as the combination of the two can achieve room temperature liquid state.

[0018] Preferably, the ionic liquid is selected from one of the following ionic liquids: 1-ethyl-3-methylimidazolium hexafluorophosphate ([EMIM][PF6]), 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM][BF4]), 1-ethyl-3-methylimidazolium trifluorosulfonate ([EMIM][CF3SO3]), 1-ethyl-3-methylimidazolium chloride ([EMIM]Cl), 1-ethyl-3-methylimidazolium bromide ([EMIM]Br), 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([EMIM][NTf2]), 1-butyl-3-methylimidazolium chloride ([EMIM][NTf2]), 1-ethyl-3-methylimidazolium chloride ([EMIM][PF6 ... 1-Butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF6]), 1-Butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF4]), 1-Butyl-3-methylimidazolium trifluorosulfonate ([BMIM][CF3SO3]), 1-Butyl-3-methylimidazolium chloride ([BMIM]Cl), 1-Butyl-3-methylimidazolium bromide ([BMIM]Br), 1-Butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([BMIM][NTf2]), N-ethylpyridine tetrafluoroborate ([EPy][BF4]), tetramethylammonium bis(trifluoromethanesulfonyl)imide ([N... 1111 [NTf2]), trihexyltetradecylphosphonium chloride ([P 66614 [Cl]) or hexadecyl-3-methylimidazolium bromide.

[0019] Preferably, the weight percentage of the total mass of the ionic liquid and the liquid crystal dimming layer is less than 0.05%.

[0020] Compared with the prior art, the present invention has the following beneficial effects: By adding ionic liquids, the electrical properties of the liquid crystal dimming layer can be changed without altering its original optical properties, thereby reducing the driving voltage.

[0021] Ionic liquids are essentially organic salts with high stability and compatibility with organic materials in liquid crystal dimming layers. The amount added in this invention is low, which significantly reduces the potential risk of breakdown and improves the stability of the liquid crystal dimming film. Detailed Implementation

[0022] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the following description is provided in conjunction with embodiments.

[0023] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0024] It should be stated that all the numbers used in the specification and claims to express characteristics dimensions, quantities and physical properties should be understood as being modified by the term "about" in all cases unless otherwise indicated. Therefore, unless otherwise indicated, the numerical parameters set forth in the specification and the attached claims are approximations that can vary as desired by those skilled in the art to seek the required properties obtained with the teachings disclosed herein, appropriately adjusting these approximations. The use of the term "about" in the context of a range of values includes all the numbers within the range and any range that would be derived from the end points of the range, for example, the range of 1 to 5 includes 1, 1.2, 1.4, 1.55, 2, 2.75, 3, 3.80, 4 and 5, etc.

[0025] The present application provides a high-stability low-voltage driven liquid crystal dimming film, which has a first conductive film, a liquid crystal dimming layer and a second conductive film, the liquid crystal dimming layer is located between the first conductive film and the second conductive film, the liquid crystal dimming layer contains liquid crystal, polymer or ionic liquid, the mass of the polymer is not less than 30% of the total mass of the polymer and the liquid crystal, and the weight percentage of the ionic liquid in the total mass of the liquid crystal dimming layer is less than 2%.

[0026] The first conductive layer or the second conductive layer of the present application contains at least one conductive layer and at least one base film, the conductive layer is composed of transparent conductive oxide or metal material, the base film is made of flexible polymer material, the transparent conductive oxide contains at least one of indium tin oxide, fluorine-doped tin dioxide or aluminum-doped zinc oxide, the metal material contains at least one of aluminum, copper or silver, and the flexible polymer contains at least one of polyethylene terephthalate, polyethylene naphthalate or polyimide.

[0027] The transparent conductive oxide can be indium tin oxide, and the flexible polymer can be polyethylene terephthalate.

[0028] The liquid crystal of the present application is nematic liquid crystal; the nematic liquid crystal contains at least one liquid crystal monomer represented by the following molecules: ; wherein, X, Y each independently represents C1-C12 alkyl, alkoxy, cyano, isothiocyanate or halogen, ring A, ring B each independently represents benzene ring, pyridine ring or cyclohexane ring; m, n each independently represents an integer of 0-4; L is acetylene bond, olefin bond or ester group; a represents 0 or 1. It can be understood that other liquid crystals containing nematic liquid crystal should also belong to the protection scope of the present application, such as adding chiral agent to nematic liquid crystal, so that it can realize the performance of cholesteric liquid crystal, which belongs to the protection scope of the present application.

[0029] The nematic liquid crystal of the present application can be commercially available or self-made. In the embodiments of the present application, the nematic liquid crystal is a positive liquid crystal. The liquid crystal of the present application, for example, E7, E8, SLC1717, SLC7011, ZLI-3239 or C7, is well known to those skilled in the art. The chemical composition of E7 has the following components and proportions:

[0030] The chemical composition of E8 has the following components and proportions:

[0031] The polymer of the present application contains at least one acrylic resin or epoxy resin and at least one initiator; the mass of the polymer is 30%-70% of the total mass of the polymer and the liquid crystal; the initiator is a photoinitiator or a thermal initiator; the mass percentage of the initiator in the total mass of the liquid crystal light-adjusting layer is 0.01-5%. The polymer of the present application can also contain polystyrene, polycarbonate and thiol polymer. As for the type of initiator, it can be a free radical initiator or a cationic initiator, for example, but not limited to, 2-hydroxy-2-methylpropiophenone (1173), 1-hydroxycyclohexyl phenyl ketone (184), benzoin dimethyl ether (651), 2,4,6-trimethylbenzoyl diphenyl phosphine oxide (TPO), bis(2,4,6-trimethylbenzoyl) phenyl phosphine oxide (819) or isopropyl thioxanthone (ITX).

[0032] The polymer used in the present application is NOA65, which is well known to those skilled in the art.

[0033] As a formula for a liquid crystal light-adjusting film, it is generally necessary to mix and then perform heat curing or light curing. Those skilled in the art can understand that the polymer in the present application is before curing. In order to achieve better results, a spacer can be added.

[0034] The ionic liquid of the present application is selected from one of a salt composed of an organic cation and an inorganic anion, a salt composed of an inorganic cation and an organic anion, or a salt composed of an organic cation and an organic anion.

[0035] Ionic liquid is a kind of organic salt composed of cation and anion in liquid state at room temperature, also known as room temperature ionic liquid. Ionic liquid has good stability, including thermal stability, which can maintain liquid state in a wide temperature range; chemical stability, which is not easy to react with other substances; electrochemical stability, which is not easy to react with other substances under the condition of electricity; physical property stability, which maintains physical property stability in a large temperature range. The ionic liquid composed of organic cation is more common.

[0036] The organic cation of the ionic liquid of the present application is an imidazolium, pyridinium, pyrrolidinium, piperidinium, pyrazolium, triazolium, quaternary ammonium, quaternary phosphonium or thiazolium organic cation, and the organic or inorganic anion is triflate, bis(trifluoromethylsulfonyl)imide, hexafluorophosphate, tetrafluoroborate, methylsulfate, acetate, trifluoroacetate, bis(fluorosulfonyl)imide, methylsulfate, methylcarboxylate, chloride, bromide, iodide, fluoride, nitrate, sulfate, hydrogen sulfate, phosphate, decanoate or dicyanamide anion.

[0037] The organic cation of the ionic liquid of the present application is selected from one of the following cations: 1-butyl-3-methylimidazolium, 1-propyl-3-methylimidazolium, 1-ethyl-3-methylimidazolium, 1-methyl-3-methylimidazolium, 1-methylimidazolium, 1-ethylimidazolium, 1-propylimidazolium, 1-butylimidazolium, 1-pentylimidazolium, 1-hexylimidazolium, 1-heptylimidazolium, 1-octylimidazolium, 1-nonylimidazolium, 1-decylimidazolium, 1-undecylimidazolium, 1-dodecylimidazolium, 1,3-diisopropylimidazolium, 1-vinyl-3-methylimidazolium, 1-allyl-3-methylimidazolium, 1-butylpyridinium, 1-propylpyridinium, 1-ethylpyridinium, 1-methylpyridinium, tetrabutylammonium, tetrapropylammonium, tetraethylammonium, tetramethylammonium, butyltriethylammonium, ethyltributylammonium, tetrabutylphosphonium, tetrapropylphosphonium, tetraethylphosphonium, tetramethylphosphonium, butyltriethylphosphonium, ethyltributylphosphonium, trihexyl(tetradecyl)phosphonium, N-ethyl-N-methylpyrrolidinium, N-propyl-N-methylpyrrolidinium, N-butyl-N-methylpyrrolidinium, N-hexyl-N-methylpyrrolidinium, N-octyl-N-methylpyrrolidinium, N-ethyl-N-methylpiperidinium, N-propyl-N-methylpiperidinium, N-butyl-N-methylpiperidinium, N-hexyl-N-methylpiperidinium or N-octyl-N-methylpiperidinium.

[0038] As for the ionic liquid, its cation can be one or more, and its anion can be one or more, as long as the combination of each other can achieve room temperature liquid state.

[0039] The ionic liquid of the present application is selected from one of the following ionic liquids: 1-ethyl-3-methylimidazolium hexafluorophosphate ([EMIM][PF6]), 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM][BF4]), 1-ethyl-3-methylimidazolium triflate ([EMIM][CF3SO3]), 1-ethyl-3-methylimidazolium chloride ([EMIM]Cl), 1-ethyl-3-methylimidazolium bromide ([EMIM]Br), 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([EMIM][NTf2]), 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF6]), 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF4]), 1-butyl-3-methylimidazolium triflate ([BMIM][CF3SO3]), 1-butyl-3-methylimidazolium chloride ([BMIM]Cl), 1-butyl-3-methylimidazolium bromide ([BMIM]Br), 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([BMIM][NTf2]), N-ethylpyridinium tetrafluoroborate ([EPy][BF4]), tetramethylammonium bis(trifluoromethylsulfonyl)imide ([N 1111 ][NTf2]), trihexyltetradecylphosphonium chloride ([P 66614 ][Cl]), or hexadecyl-3-methylimidazolium bromide.

[0040] In particular, the weight percentage of the ionic liquid of the present application in the total mass of the liquid crystal light-adjustable layer is less than 0.05%. Specific embodiment 1 E7 liquid crystal and NOA65 are mixed in a ratio of 1:1, and stirred uniformly. The total amount of E7 liquid crystal and NOA65 is 100 parts, 1 part (1%) of initiator TPO is added, 0.05 part (0.05%) of ionic liquid is added, and 0.5 part (0.5%) of 20-micron glass beads is added. It can be understood that the feeding method and the actual ratio are different. When 0.05% of ionic liquid is added according to the above-mentioned parts, the proportion of ionic liquid in the entire formula is less than 0.05%. The ionic liquid of this embodiment is 1-ethyl-3-methylimidazolium tetrafluoroborate.

[0042] After the above mixture is stirred uniformly, it is pressed into a 20-micron film with an ITO-PET film roller, and is cured under ultraviolet light with a light intensity of 6 mW / cm2and a wavelength of 365 nm to obtain a sample for photoelectric performance testing. Specific embodiment

[0043] The same method as in embodiment 1 is used, except that the ionic liquid is replaced by N-ethylpyridinium tetrafluoroborate. Specific embodiment

[0044] The same way as example 1, only the ionic liquid is replaced by 1-ethyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide salt. Specific embodiments

[0045] The same way as example 1, only the ionic liquid is replaced by 1-ethyl-3-methylimidazolium hexafluorophosphate. Specific embodiments

[0046] The same way as example 1, only the proportion of ionic liquid is changed to 1.5%. Specific embodiments

[0047] The same way as example 1, only the proportion of ionic liquid is changed to 0.5%. Specific embodiments

[0048] The same way as example 1, only the proportion of ionic liquid is changed to 0.02%. Specific embodiments

[0049] The same way as example 1, only the proportion of ionic liquid is changed to 0.01%. Specific embodiments

[0050] The same way as example 1, only the E7 liquid crystal and NOA65 are mixed in a ratio of 3:7. Specific embodiments

[0051] The same way as example 1, only the E7 liquid crystal and NOA65 are mixed in a ratio of 7:3.

[0052] Comparative example 1 The same way as example 1, only no ionic liquid is added.

[0053] Comparative example 2 The same way as example 1, only the proportion of ionic liquid is changed to 3%.

[0054] For photoelectric performance test, the driving voltage is defined as 95% of the maximum transmittance. It is considered by the present application that the driving voltage below 36V is low, such driving voltage is safe to human body and can reduce power consumption. Two indicators are used to test stability. The indicator of stability 1 is on-off cycle indicator, defined as the transmittance change is less than 5% when the on-off cycle reaches 100,000 times at room temperature, and it is considered that such stability is high. The indicator of stability 2 is electrical breakdown performance, defined as the transmittance change is less than 5% after 10 times of on-off cycle with 2 times of driving voltage and then continuous power for 60 minutes, and it is considered that such stability is high. For stability 2 test, if there is a burst point or an etching point, it is directly judged as not passing.

[0055] The test data is as follows:

[0056] It can be seen that the driving voltage is high without adding ionic liquid, and adding a high proportion of ionic liquid leads to the direct visual failure of the stability 2 test.

[0057] By adding a small proportion of ionic liquid, the driving voltage is reduced to below 36V, and the voltage drop is obvious. According to the test results, its stability meets the requirements. It can be seen that the influence of the type of ionic liquid on stability is small, and a small proportion of ionic liquid can meet the requirement of reducing the driving voltage.

[0058] The above description of disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art. The present application will not be limited to these embodiments shown herein, but only needs to be consistent with the principles and characteristics disclosed herein.

Claims

1. A highly stable, low-voltage driven liquid crystal dimming film, comprising a first conductive film, a liquid crystal dimming layer, and a second conductive film, characterized in that, The liquid crystal dimming layer is located between the first conductive film and the second conductive film. The liquid crystal dimming layer contains liquid crystal, polymer or ionic liquid. The polymer has a mass of not less than 30% of the total mass of the polymer and liquid crystal, and the ionic liquid has a weight percentage of less than 2% of the total mass of the liquid crystal dimming layer.

2. The liquid crystal dimming film according to claim 1, characterized in that, The first conductive layer or the second conductive layer comprises at least one conductive layer and at least one base film. The conductive layer is composed of a transparent conductive oxide or a metallic material, and the base film is made of a flexible polymer material. The transparent conductive oxide contains at least one of indium tin oxide, fluorine-doped tin dioxide, or aluminum-doped zinc oxide. The metallic material contains at least one of aluminum, copper, or silver. The flexible polymer contains at least one of polyethylene terephthalate, polyethylene naphthalate, or polyimide.

3. The liquid crystal dimming film according to claim 1, characterized in that, The transparent conductive oxide is indium tin oxide, and the flexible polymer is polyethylene terephthalate.

4. The liquid crystal dimming film according to claim 1, characterized in that, The liquid crystal is a nematic liquid crystal; the nematic liquid crystal contains at least one liquid crystal monomer represented by the following molecules: Where X and Y each independently represent C1-C12 alkyl, alkoxy, cyano, isothiocyano or halogen; ring A and ring B each independently represent benzene ring, pyridine ring or cyclohexane ring; m and n each independently represent integers from 0 to 4; L is an alkyne bond, alkene bond or ester group; a represents 0 or 1.

5. The liquid crystal dimming film according to claim 1, characterized in that, The polymer contains at least one acrylic resin or epoxy resin and at least one initiator; the polymer mass is 30%-70% of the total mass of the polymer and liquid crystal; the initiator is a photoinitiator or a thermal initiator; the mass percentage of the initiator to the total mass of the liquid crystal dimming layer is 0.01-5%.

6. The liquid crystal dimming film according to claim 1, characterized in that, The ionic liquid is selected from one of the following: a salt composed of an organic cation and an inorganic anion, a salt composed of an inorganic cation and an organic anion, or a salt composed of an organic cation and an organic anion.

7. The liquid crystal dimming film according to claim 6, characterized in that, The organic cation of the ionic liquid is an imidazole, pyridine, pyrrolidine, piperidine, pyrazole, triazole, quaternary ammonium, quaternary phosphorus, or thiazole organic cation, and the organic or inorganic anion is a trifluoromethanesulfonate, bis(trifluoromethanesulfonyl)imide, hexafluorophosphate, tetrafluoroborate, methanesulfonate, acetate, trifluoroacetate, bis(fluorosulfonyl)imide, methyl sulfate, methyl carboxylate, chloride, bromide, iodide, fluoride, nitrate, sulfate, hydrogen sulfate, phosphate, decanoate, or dicyandiamide anion.

8. The liquid crystal dimming film according to claim 7, characterized in that, The organic cation of the ionic liquid is selected from one of the following cations: 1-butyl-3-methylimidazolium cation, 1-propyl-3-methylimidazolium cation, 1-ethyl-3-methylimidazolium cation, 1-methyl-3-methylimidazolium cation, 1-methylimidazolium cation, 1-ethylimidazolium cation, 1-propylimidazolium cation, 1-butylimidazolium cation, 1-pentylimidazolium cation, 1-hexylimidazolium cation, 1-heptylimidazolium cation, 1-octylimidazolium cation, 1-nonylimidazolium cation, 1-decylimidazolium cation, 1-undecylimidazolium cation, 1-dodecylimidazolium cation, 1,3-diisopropylimidazolium cation, 1-vinyl-3-methylimidazolium cation, 1-allyl-3-methylimidazolium cation, 1-butylpyridine cation, 1-propylpyridine cation, 1-ethylpyridine cation. 1-Methylpyridine cation, tetrabutylammonium cation, tetrapropylammonium cation, tetraethylammonium cation, tetramethylammonium cation, butyltriethylammonium cation, ethyltributylammonium cation, tetrabutylphosphonium cation, tetrapropylphosphonium cation, tetraethylphosphonium cation, tetramethylphosphonium cation, butyltriethylphosphonium cation, ethyltributylphosphonium cation, trihexyl(tetradecyl)phosphonium cation, N-ethyl-N-methylpyrrolidine cation, N-propyl-N-methylpyrrolidine cation, N-butyl-N-methylpyrrolidine cation, N-hexyl-N-methylpyrrolidine cation, N-octyl-N-methylpyrrolidine cation, N-ethyl-N-methylpiperidine cation, N-propyl-N-methylpiperidine cation, N-butyl-N-methylpiperidine cation, N-hexyl-N-methylpiperidine cation or N-octyl-N-methylpiperidine cation.

9. The liquid crystal dimming film according to claim 1, characterized in that, The ionic liquid is selected from one of the following ionic liquids: 1-ethyl-3-methylimidazolium hexafluorophosphate, 1-ethyl-3-methylimidazolium tetrafluoroborate, 1-ethyl-3-methylimidazolium trifluorosulfonate, 1-ethyl-3-methylimidazolium chloride, 1-ethyl-3-methylimidazolium bromide, 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, 1-butyl-3-methylimidazolium hexafluorophosphate, 1-butyl-3-methylimidazolium tetrafluoroborate, 1-butyl-3-methylimidazolium trifluorosulfonate, 1-butyl-3-methylimidazolium chloride, 1-butyl-3-methylimidazolium bromide, 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, N-ethylpyridine tetrafluoroborate, tetramethylammonium bis(trifluoromethanesulfonyl)imide, trihexyltetradecylphosphonium chloride, or hexadecyl-3-methylimidazolium bromide.

10. The liquid crystal dimming film according to claim 1, characterized in that, The weight percentage of the total mass of the ionic liquid and the liquid crystal dimming layer is less than 0.05%.

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