Multicolor liquid crystal writing device and preparation method thereof

Abstract

The application discloses a kind of multicolor liquid crystal writing device and preparation method, comprising: sequentially arranged first transparent substrate layer, first conductive layer, first polymer composite liquid crystal layer, second transparent substrate layer, second polymer composite liquid crystal layer, third transparent substrate layer, third polymer composite liquid crystal layer, second conductive layer and fourth substrate layer;First polymer composite liquid crystal layer, second polymer composite liquid crystal layer and third polymer composite liquid crystal layer are respectively distributed on the conductive layer or transparent substrate layer corresponding thereto by the way of doctor blade coating;Different optical rotation control agents are added in first polymer composite liquid crystal layer, second polymer composite liquid crystal layer and third polymer composite liquid crystal layer respectively, to reflect different colors;Nano toner and contrast adjusting agent are doped in the first transparent substrate layer and the fourth substrate layer, so that the color reflected by the liquid crystal is brighter and more gorgeous, and the contrast is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid crystal writing device, and particularly relates to a multi-color liquid crystal writing device and a preparation method. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute the prior art.

[0003] With the development of liquid crystal technology, liquid crystal writing devices or liquid crystal writing boards have also been rapidly developed, and are gradually used as writing tools such as blackboards or whiteboards in the fields of education and office work, and have very good development prospects.

[0004] At present, the liquid crystal writing devices on the market can only write one color of handwriting, and the single color greatly hinders the application range. In addition, due to the frequent interference of ultraviolet light in the environment, the writing board is prone to aging, thereby increasing the failure rate and greatly reducing the service life.

[0005] During the production and processing of the liquid crystal writing device, the film material with a certain thickness is mostly obtained through rolling, and then the ultraviolet light is used for polymerization. One of the defects of this method is that when there are uneven parts in the film material, it is difficult to make it uniform through a certain way, so that the preparation cost is increased and resources are wasted. SUMMARY

[0006] In order to solve the above problems, the present application provides a multi-color liquid crystal writing device and a preparation method, which can produce three different colors of handwriting, and uses a coating method to prepare a liquid crystal coating, so that the polymer composite liquid crystal layer can be more uniformly distributed.

[0007] In some embodiments, the following technical solutions are adopted:

[0008] A multi-color liquid crystal writing device, comprising: a first transparent substrate layer, a first conductive layer, a first polymer composite liquid crystal layer, a second transparent substrate layer, a second polymer composite liquid crystal layer, a third transparent substrate layer, a third polymer composite liquid crystal layer, a second conductive layer and a fourth substrate layer arranged in sequence.

[0009] The first polymer composite liquid crystal layer, the second polymer composite liquid crystal layer and the third polymer composite liquid crystal layer are uniformly distributed on the conductive layer or the transparent substrate layer corresponding thereto by means of blade coating.

[0010] The first, second and third polymer composite liquid crystal layers are added with different optical rotation control agents to reflect different colors; the first and fourth transparent substrate layers are doped with nano color modifier and contrast adjustment agent, the nano color modifier includes 0-5 parts of aluminum nanorod, 0-5 parts of aluminum chloride nanoparticles and 0-5 parts of nano aluminum oxide particles, so that the color reflected by the liquid crystal is brighter and more brilliant, and the contrast adjustment agent includes 0-5 parts of nano chromium, 0-5 parts of copper sulfide nanoparticles and 0-5 parts of titanium dioxide nanoparticles to improve the contrast.

[0011] As a further place, the first transparent substrate layer is a PET transparent film, the film is 10-80μm, the light transmittance is 90-97%, the PET transparent film is also doped with an electrical insulation adjustment agent, the electrical insulation adjustment agent includes: 0-10 parts of nano kaolin, 0-10 parts of nano alumina and 0-10 parts of nano boron carbide, to adjust the electrical insulation of the PET transparent film.

[0012] As a further place, the raw material composition of the first, second or third polymer composite liquid crystal layer includes, by weight fraction: 50-90 parts of nematic liquid crystal, 1-35 parts of optical rotation control agent mixture, 15-90 parts of ultraviolet polymerizable monomer mixture, 0.1-15 parts of photoinitiator mixture, 0.01-1 parts of ultraviolet absorber, 0.05-1 parts of spacer microspheres.

[0013] As a further place, the second transparent substrate layer is a PET transparent film, the film thickness is 1-20μm, the light transmittance is 90-98%; the PET transparent film is doped with nano color modifier and contrast adjustment agent; the nano color modifier includes 0-5 parts of aluminum nanorod and 0-5 parts of nano aluminum oxide particles; the contrast adjustment agent includes 0-5 parts of nano chromium and 0-5 parts of titanium dioxide nanoparticles.

[0014] As a further place, the third transparent substrate layer is a PET transparent film, the film thickness is 1-20μm, the light transmittance is 90-98%; the PET transparent film is doped with nano color modifier and contrast adjustment agent; the nano color modifier includes 0-5 parts of aluminum nanorod, 0-5 parts of aluminum chloride nanoparticles and 0-5 parts of aluminum oxide nanoparticles; the contrast adjustment agent includes 0-5 parts of nano chromium, 0-5 parts of copper sulfide nanoparticles and 0-5 parts of titanium dioxide nanoparticles.

[0015] As a further local solution, the fourth substrate layer is a PET transparent film, the film is 10-80 μm, the light transmittance is 90-98% or non-transparent black, and the PET transparent film is further doped with an electrically insulating regulator, and the electrically insulating regulator includes: 0-10 parts of nano kaolin, 0-10 parts of nano alumina and 0-10 parts of nano boron carbide, so as to adjust the electrically insulating property of the PET transparent film.

[0016] In some other embodiments, the following technical solutions are adopted:

[0017] A preparation method of a multi-color liquid crystal writing device, comprising:

[0018] 1) Preparation of a liquid crystal / ultraviolet polymerizable monomer mixture

[0019] The nematic liquid crystal, optical control agent, ultraviolet polymerizable monomer, photoinitiator, ultraviolet absorber and spacer microspheres are mixed according to the set weight ratio, and three kinds of uniform and stable liquid crystal / ultraviolet polymerizable monomer mixtures with different proportions are obtained;

[0020] 2) Preparation of a third polymer composite liquid crystal layer

[0021] Under the conditions of 25-40℃ and vacuum, a layer of 1-20 μm thick liquid crystal / ultraviolet polymerizable monomer mixture is uniformly coated on the conductive surface of the fourth substrate layer by means of scraping coating (scraping coating speed is 0.5-10 cm / s -1 ), after the coating is completed, the third transparent substrate layer is attached to the surface of the liquid crystal / ultraviolet polymerizable monomer mixture, and a wavelength of 360-400 nm, a light intensity of 1-100 mW / cm 2 of ultraviolet light is used for irradiation for 5-35 min, and a third polymer composite liquid crystal layer is obtained;

[0022] 3) Preparation of a second polymer composite liquid crystal layer

[0023] Under the conditions of 25-40℃ and vacuum, a layer of 1-20 μm thick liquid crystal / ultraviolet polymerizable monomer mixture is uniformly coated on the other side of the third transparent substrate layer by means of scraping coating (scraping coating speed is 0.5-10 cm / s -1 ), after the coating is completed, the second transparent substrate layer is attached to the surface of the liquid crystal / ultraviolet polymerizable monomer mixture, and a wavelength of 360-400 nm, a light intensity of 1-100 mW / cm 2 of ultraviolet light is used for irradiation for 5-35 min, and a second polymer composite liquid crystal layer is obtained;

[0024] 4) Preparation of a first polymer composite liquid crystal layer

[0025] The second transparent substrate layer is coated with a 1-20 micron thick layer of liquid crystal / UV polymerizable monomer mixture on the other side by means of scraping (scraping speed is 0.5-10 cm / s) under vacuum at 25-40℃ -1 After the coating, the conductive surface of the first transparent substrate layer is attached to the surface of the liquid crystal / UV polymerizable monomer mixture, and the first polymer composite liquid crystal layer is obtained by irradiation with UV light of wavelength 360-400 nm and light intensity of 1-100 mW / cm 2

[0026] The ratio of the liquid crystal / UV polymerizable monomer mixture coated in each polymer composite liquid crystal layer is different, and the components and content of the optical rotation control agent in the liquid crystal / UV polymerizable monomer mixture coated in each polymer composite liquid crystal layer are different.

[0027] Compared with the prior art, the present application has the following advantages:

[0028] (1) The multicolor liquid crystal writing device of the present application is provided with three polymer composite liquid crystal layers, and each two polymer composite liquid crystal layers are separated by a layer of PET transparent ultra-thin film without conductive layer. When a voltage is applied, the PET transparent ultra-thin film without conductive layer acts as an insulating layer and does not shield the electric field, so that the purpose of erasing the writing can be achieved. The two layers of PET transparent ultra-thin film without conductive layer also have the function of making the writing more bright and bright, and higher contrast. The reflectivity of the three liquid crystal layers can be achieved by changing the ratio of the three layers.

[0029] (2) The addition of the ultraviolet absorber in the polymer composite liquid crystal layer can slow down the aging speed of the liquid crystal layer. The use of non-conductive high-transmittance PET film as an insulating layer does not affect the field strength of the electric field, and thus does not affect the erasing effect of the writing board. In addition, the doping of aluminum nanorods, aluminum chloride particles and aluminum oxide nanoparticles can make the red, green and blue color tones brighter and more brilliant, and the doping of nanometer chromium, copper sulfide nanoparticles and titanium dioxide nanoparticles can achieve better contrast than ordinary writing boards.

[0030] (3) The optical rotation control agent used in the present application includes: (R)-(-)-3-hydroxyisobutyric acid methyl ester, (R)-(+)-1-phenyl ethanol, (S)-(-)-1-phenyl ethanol, (S)-2-chloro-4-methyl valeric acid, R-2-octanol, S-(-)-2-methyl-1-butanol. These six kinds of optical rotation control agents are less used in liquid crystal, and left-handed and right-handed optical rotation control agents are used at the same time. The color of the font can be adjusted by adding optical rotation control agents with different components of optical rotation.

[0031] ​Additional features and advantages of other aspects of the present application will be set forth in the descriptions to follow, and in part will be apparent from the descriptions or can be learned by practice of aspects of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 Structure schematic diagram of multicolor liquid crystal writing device in embodiments of the present application;

[0033] Fig. 2(a)-(c) is a process schematic diagram of multicolor liquid crystal writing device in embodiments of the present application;

[0034] Wherein, 1. first transparent substrate layer, 2. first conductive layer, 3. first polymer composite liquid crystal layer, 4. second transparent substrate layer, 5. second polymer composite liquid crystal layer, 6. third transparent substrate layer, 7. third polymer composite liquid crystal layer, 8. second conductive layer, 9. fourth substrate layer. DETAILED DESCRIPTION

[0035] It should be noted that the following detailed description is illustrative only, and is intended to provide further description in addition to the aspects of the present application as described in connection with the preceding description. As such, although the following detailed description is set forth in connection with certain exemplary aspects of the present application, it will be understood that the application is not limited to the aspects disclosed herein, but is applicable to other aspects as well. As used herein, the use of the term "about" in conjunction with a value refers to a value that is within 10% of the indicated value.

[0036] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the example embodiments of the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0037] Example One

[0038] In one or more embodiments, a multicolor liquid crystal writing device is disclosed, comprising Figure 1 , comprising: first transparent substrate layer, first conductive layer, first polymer composite liquid crystal layer, second transparent substrate layer, second polymer composite liquid crystal layer, third transparent substrate layer, third polymer composite liquid crystal layer, second conductive layer and fourth substrate layer arranged in order from top to bottom; the fourth transparent substrate layer can be selected according to the use condition, such as observing in both positive and negative directions, transparent film can be used, such as observing on one side, black film can be selected to improve the observability.

[0039] In this embodiment, different optical rotation control agents are added to the first, second and third polymer composite liquid crystal layers respectively to reflect different colors; the optical rotation control agents have optical rotation, wherein the ones with prefix R are right-handed and can make the liquid crystal droplets deflect to the right, and the ones with prefix S are left-handed and can make the liquid crystal droplets deflect to the left, and the helical twist rates of different optical rotation control agents are also different, and under the condition of adding the same amount, the greater the helical twist rate, the easier the liquid crystal droplets deflect. Therefore, different colors can be displayed by adding different types of optical rotation control agents. In addition, the more the amount of the same type of optical rotation control agent, the easier the liquid crystal droplets deflect. Reducing / increasing the proportion of liquid crystal and ultraviolet polymerizable monomer can increase / decrease the proportion of optical rotation control agent, and different colors can also be achieved.

[0040] When the writing board is pressed, the orientation of the liquid crystal droplets in the liquid crystal layer deflects, so that light of different colors can be reflected. Different pressures are applied, which causes the angles of deflection of the liquid crystal droplets to be inconsistent, thereby realizing multicolor display.

[0041] The first, second and third polymer composite liquid crystal layers are prepared by the method of doctor blading and cured by photopolymerization; the method of preparing the polymer composite liquid crystal layer by doctor blading in this embodiment makes the obtained liquid crystal layer more uniform, and even if there are uneven parts, they can be further improved by coating, so that a uniform polymer composite liquid crystal layer is finally obtained.

[0042] The liquid crystal writing device of this embodiment includes three polymer composite liquid crystal layers, and each two layers of polymer composite liquid crystal layers are separated by a layer of PET transparent ultrathin film without conductive layer plating. When a voltage is applied, the PET transparent ultrathin film acts as an insulating layer and does not shield the electric field, thereby achieving the purpose of erasing the writing. The two layers of PET transparent ultrathin film also have the function of making the writing more bright and bright, and higher contrast. The reflectivity of the three liquid crystal layers can also be superimposed by changing the proportion of the three liquid crystals.

[0043] In the embodiment, the first transparent substrate layer is plated with the first conductive layer on the lower side, and the fourth substrate layer is plated with the second conductive layer on the upper side. Both the first conductive layer and the second conductive layer can be ITO. Both the first transparent substrate layer and the fourth substrate layer can be PET transparent film, with a thickness of 1-20 μm and light transmittance of 90-98%. The PET transparent film is internally mixed with nanometer color modifier and contrast modifier. The nanometer color modifier includes 0-5 parts of aluminum nanorod, 0-5 parts of aluminum chloride nanoparticles, and 0-5 parts of nanometer aluminum oxide particles. The contrast modifier includes 0-5 parts of nanometer chromium, 0-5 parts of copper sulfide nanoparticles, and 0-5 parts of titanium dioxide nanoparticles. In addition, the first transparent substrate layer and the fourth substrate layer are also mixed with electrically insulating modifier, which includes 0-10 parts of nanometer kaolin, 0-10 parts of nanometer aluminum oxide, and 0-10 parts of nanometer boron carbide, to adjust the electrically insulating property of the PET transparent film.

[0044] In the embodiment, the electrically non-conductive high-transmittance PET film used as the insulating layer does not affect the field strength of the electric field, and thus does not affect the erasing effect of the writing board. In addition, the mixing of aluminum nanorod, aluminum chloride particles, and aluminum oxide nanoparticles can make the red, green, and blue color tones brighter and more vivid, and the mixing of nanometer chromium, copper sulfide nanoparticles, and titanium dioxide nanoparticles can achieve better contrast than ordinary writing boards.

[0045] In the embodiment, the raw material composition of the first polymer composite liquid crystal layer, the second polymer composite liquid crystal layer, and the third polymer composite liquid crystal layer each includes, by weight fraction, 50-90 parts of nematic liquid crystal, 1-35 parts of optical control agent mixture, 15-90 parts of ultraviolet polymerizable monomer mixture, 0.1-15 parts of photoinitiator mixture, 0.01-1 part of ultraviolet absorber, and 0.05-1 part of spacer microspheres.

[0046] The thickness of the upper polymer composite liquid crystal layer is 1-40 μm. The addition of the photoinitiator can polymerize the above-mentioned monomers to form a polymer network, achieving the anchoring effect of the liquid crystal droplets. By controlling the proportion of the above-mentioned monomers, the driving voltage, driving frequency, and bonding performance of the polymer composite liquid crystal layer can be improved.

[0047] The nematic liquid crystal has a birefringence Δn of 0.1-0.7, a dielectric constant of 25-40, a viscosity value of 1-40 mm 2 ·S -1 , a clearing point of 50-85℃, a threshold voltage V th of 5-12 V, a saturation voltage V sat of 5-12 V, a molecular weight of 200-1000 g / mol, and a freezing temperature range of -20-20℃.

[0048] The raw material composition of the optical control agent mixture includes, by weight fraction: 0-6 parts (R)-(-)-methyl 3-hydroxyisobutyrate (CAS No.: 72657-23-9), 0-8 parts (R)-(+)-1-phenylethanol (CAS No.: 1517-69-7), 0-20 parts (S)-(-)-1-phenylethanol (CAS No.: 1445-91-6), 0-6 parts (S)-2-chloro-4-methylvaleric acid (CAS No.: 28659-81-6), 0-8 parts R-2-octanol (CAS No.: 5978-70-1), 0-20 parts S-(-)-2-methyl-1-butanol (CAS No.: 1565-80-6), each component not being 0 at the same time.

[0049] The optical control agents (R)-(-)-methyl 3-hydroxyisobutyrate, (R)-(+)-1-phenylethanol, (S)-(-)-1-phenylethanol, (S)-2-chloro-4-methylvaleric acid, R-2-octanol, and S-(-)-2-methyl-1-butanol used in this embodiment are less used in liquid crystals, and the optical control agents of left-handed and right-handed are used at the same time, so that the color of the font can be adjusted by adding optical control agents of different optical properties; in this embodiment, the types and components of the optical control agents added in the first, second, and third polymer composite liquid crystal layers are different, so as to realize display in different colors.

[0050] The raw material composition of the ultraviolet polymerizable monomer includes, by weight fraction: 0-30 parts 1,6-hexanediol diacrylate (CAS No.: 13048-33-4), 0-20 parts dipropylene glycol diacrylate (CAS No.: 57472-68-1), 0-20 parts cyclo-trihydroxymethyl propane trimethyl acrylate (CAS No.: 3290-92-4), and 0-20 parts pentaerythritol triacrylate (CAS No.: 3524-68-3), each component not being 0 at the same time.

[0051] The composition of the photoinitiator mixture includes, by weight fraction: 0-10 parts 1-hydroxycyclohexyl phenyl ketone (CAS No.: 947-19-3), 0-10 parts 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl) butanone (CAS No.: 119313-12-1), 0-10 parts 2-methyl-1-(4-methylthiophenyl)-2-morpholinyl-1-propanone (CAS No.: 71868-10-5), 0-5 parts 2-isopropylthioxanthone (CAS No.: 5495-84-1), 0-5 parts bis(1-(2,4-difluorophenyl)-3-pyrrolyl) titanium dioxane (CAS No.: 125051-32-3), each component not being 0 at the same time.

[0052] By controlling the proportion between the above light initiator, the polymerization rate of the ultraviolet polymerizable monomer can be adjusted, so as to realize the controllable polymerization rate, and the polymerization rate can be reasonably controlled according to the preparation environment.

[0053] The raw material composition of the ultraviolet absorber includes, by weight fraction: 0-0.5 parts of 2,4-bis(2,4-dimethylphenyl)-6-(2-hydroxy-4-n-octyloxyphenyl)-1,3,5-triazine (CAS No.: 125051-32-3), 0-0.5 parts of 3,5-di-tert-butyl-4-hydroxybenzoic acid-2,4-di-tert-butylphenyl ester (CAS No.: 4221-80-1), and 0-0.5 parts of 2-(4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl)-5-methoxyphenol (CAS No.: 1820-28-6), each component is not 0 at the same time. The addition of the ultraviolet absorber can slow down the aging speed of the liquid crystal layer;

[0054] The spacer microspheres are 0-1 parts of PS-Fe3O4 nanomicrospheres, 0-1 parts of α-cyclodextrin modified SiO2 nanomicrospheres, 0-1 parts of silanol group modified ferroferric oxide magnetic nanomicrospheres, 0-1 parts of silica microspheres, and 0-1 parts of aluminum oxide microspheres, each component is not 0 at the same time, and the microsphere size is between 1-40 μm.

[0055] The present embodiment uses optically active control agents (R)-(-)-methyl 3-hydroxyisobutyrate, (R)-(+)-1-phenylethanol, (S)-(-)-1-phenylethanol, (S)-2-chloro-4-methylvaleric acid, R-2-octanol, and S-(-)-2-methyl-1-butanol. These six optically active control agents are less used in liquid crystals, and left-handed and right-handed optically active control agents are used at the same time. The color of the font can be adjusted by adding optically active control agents with different optical activity.

[0056] In the present embodiment, the second transparent substrate layer and the third transparent substrate layer are both PET transparent films with a light transmittance of 90-98% and a thickness of 1-20 μm; and 0-5 parts of aluminum nanorods, 0-5 parts of aluminum chloride nanoparticles, and 0-5 parts of aluminum oxide nanoparticles are doped in the PET transparent film. The contrast adjuster includes 0-5 parts of nanometer chromium, 0-5 parts of copper sulfide nanoparticles, and 0-5 parts of titanium dioxide nanoparticles. Doping aluminum nanorods, aluminum chloride nanoparticles, and aluminum oxide nanoparticles can make the red, green, and blue color tones brighter and more vivid, and doping nanometer chromium, copper sulfide nanoparticles, and titanium dioxide nanoparticles can achieve better contrast than ordinary writing boards.

[0057] Example Two

[0058] In one or more embodiments, a method for preparing a multi-color liquid crystal writing device is disclosed, which comprises the following steps in combination with FIG. 2(a)-(c):

[0059] 1) Preparation of liquid crystal / UV polymerizable monomer mixture

[0060] The nematic liquid crystal, optical control agent, UV polymerizable monomer, photoinitiator, UV absorber and spacer microspheres are mixed according to the set weight ratio to obtain three kinds of uniform and stable liquid crystal / UV polymerizable monomer mixtures with different proportions, respectively;

[0061] 2) Preparation of the third polymer composite liquid crystal layer

[0062] Under the conditions of 25-40℃ and vacuum, a layer of 1-20μm thick liquid crystal / UV polymerizable monomer mixture is uniformly coated on the conductive surface of the fourth substrate layer by using the method of blade coating (blade coating speed is 0.5-10cm / s -1 ), after the coating is completed, the third transparent substrate layer is attached on the surface of the liquid crystal / UV polymerizable monomer mixture, and the third polymer composite liquid crystal layer is obtained by using the UV light with wavelength of 360-400nm and light intensity of 1-100mW / cm 2 for 5-35min irradiation;

[0063] 3) Preparation of the second polymer composite liquid crystal layer

[0064] Under the conditions of 25-40℃ and vacuum, a layer of 1-20μm thick liquid crystal / UV polymerizable monomer mixture is uniformly coated on the other side of the third transparent substrate layer by using the method of blade coating (blade coating speed is 0.5-10cm / s -1 ), after the coating is completed, the second transparent substrate layer is attached on the surface of the liquid crystal / UV polymerizable monomer mixture, and the second polymer composite liquid crystal layer is obtained by using the UV light with wavelength of 360-400nm and light intensity of 1-100mW / cm 2 for 5-35min irradiation;

[0065] 4) Preparation of the first polymer composite liquid crystal layer

[0066] Under the conditions of 25-40℃ and vacuum, a layer of 1-20μm thick liquid crystal / UV polymerizable monomer mixture is uniformly coated on the other side of the second transparent substrate layer by using the method of blade coating (blade coating speed is 0.5-10cm / s -1 ), after the coating is completed, the conductive surface of the first transparent substrate layer is attached on the surface of the liquid crystal / UV polymerizable monomer mixture, and the first polymer composite liquid crystal layer is obtained by using the UV light with wavelength of 360-400nm and light intensity of 1-100mW / cm 2under the irradiation of ultraviolet light for 5-35 minutes to obtain the first polymer composite liquid crystal layer (at this time, the complete writing device is obtained);

[0067] The proportion of the liquid crystal / ultraviolet polymerizable monomer mixture coated in each polymer composite liquid crystal layer is different, and the components and contents of the optical control agent of the liquid crystal / ultraviolet polymerizable monomer mixture coated in each polymer composite liquid crystal layer are different.

[0068] As a specific embodiment, the following gives specific examples of various different component forms of the first transparent substrate layer, the first conductive layer, the first polymer composite liquid crystal layer, the second transparent substrate layer, the second polymer composite liquid crystal layer, the third transparent substrate layer, the third polymer composite liquid crystal layer, the second conductive layer, and the fourth substrate layer, and different preparation methods.

[0069]

[0070]

[0071]

[0072]

[0073] The following gives a detailed description of the various embodiments described above:

[0074] Embodiment 1:

[0075] 1) Preparation of the third polymer composite liquid crystal layer

[0076] The nematic liquid crystal, the optical control agent mixture, the ultraviolet polymerizable monomer mixture, the photoinitiator mixture, the ultraviolet absorber, and the spacer microspheres are mixed in the following weight proportions to obtain a uniform and stable liquid crystal / ultraviolet polymerizable monomer mixture;

[0077] The liquid crystal / ultraviolet polymerizable monomer mixture is, for example, as follows:

[0078] 50 parts of nematic liquid crystal;

[0079] 1 part of the optical control agent mixture: 0.1 part of (R)-(-)-methyl 3-hydroxyisobutyrate, 0.1 part of (R)-(+)-1-phenylethanol, 0.1 part of (S)-(-)-1-phenylethanol, 0.1 part of (S)-2-chloro-4-methylvaleric acid, 0.1 part of R-2-octanol, and 0.5 parts of S-(-)-2-methyl-1-butanol;

[0080] 15 parts of the ultraviolet polymerizable monomer mixture: 4 parts of 1,6-hexanediol diacrylate, 4 parts of dipropylene glycol diacrylate, 4 parts of cyclo-trishydroxymethylpropane trimethacrylate, and 3 parts of pentaerythritol triacrylate;

[0081] 0.1 part of a photoinitiator mixture: 0.02 part of 1-hydroxycyclohexyl phenyl ketone, 0.02 part of 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl) butanone, 0.02 part of 2-methyl-1-(4-methylthiophenyl)-2-morpholinyl-1-propanone, 0.02 part of 2-isopropylthioxanthone, 0.02 part of bis(1-(2,4-difluorophenyl)-3-pyrrolyl) titanium dioxane;

[0082] 0.01 part of an ultraviolet absorber: 0.005 part of 2,4-bis(2,4-dimethylphenyl)-6-(2-hydroxy-4-n-octyloxyphenyl)-1,3,5-triazine, 0.003 part of 3,5-di-tert-butyl-4-hydroxybenzoic acid-2,4-di-tert-butylphenyl ester and 0.002 part of 2-(4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine-2-yl)-5-methoxyphenol;

[0083] 0.05 part of a spacer microsphere: 0.01 part of PS-Fe3O4 nanometer microsphere, 0.01 part of α-cyclodextrin modified SiO2 nanometer microsphere, 0.01 part of silanol group modified Fe3O4 magnetic nanometer microsphere, 0.01 part of silica microsphere and 0.01 part of alumina microsphere, the microsphere size is 1 μm;

[0084] At 25°C, under vacuum condition, a 1 μm thick liquid crystal / ultraviolet polymerizable monomer mixture is uniformly coated on the conductive surface of the fourth substrate layer by means of scraping (the scraping speed is 0.5 cm / S -1 ) and after the coating, the third transparent substrate layer is attached on the surface of the liquid crystal / ultraviolet polymerizable monomer mixture, and a wavelength of 360 nm, light intensity of 1 mW / cm 2 of ultraviolet light is used for irradiation for 5 min to obtain the third polymer composite liquid crystal layer;

[0085] 2) Preparation of the second polymer composite liquid crystal layer

[0086] The nematic liquid crystal, optical control agent mixture, ultraviolet polymerizable monomer mixture, photoinitiator mixture, ultraviolet absorber and spacer microsphere are mixed according to the following weight parts to obtain a uniform and stable liquid crystal / ultraviolet polymerizable monomer mixture;

[0087] The liquid crystal / ultraviolet polymerizable monomer mixture is exemplified as follows:

[0088] 50 parts of nematic liquid crystal;

[0089] 3 parts of optical rotation control agent mixture: 0.5 parts of (R)-(-)-methyl 3-hydroxyisobutyrate, 0.5 parts of (R)-(+)-1-phenylethanol, 0.5 parts of (S)-(-)-1-phenylethanol, 0.5 parts of (S)-2-chloro-4-methylvaleric acid, 0.5 parts of R-2-octanol, 0.5 parts of S-(-)-2-methyl-1-butanol;

[0090] 15 parts of ultraviolet polymerizable monomer mixture: 4 parts of 1,6-hexanediol diacrylate, 4 parts of dipropylene glycol diacrylate, 4 parts of cyclotrimethylolpropane trimethacrylate, and 3 parts of pentaerythritol triacrylate;

[0091] 0.1 parts of photoinitiator mixture: 0.02 parts of 1-hydroxycyclohexyl phenyl ketone, 0.02 parts of 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl) butanone, 0.02 parts of 2-methyl-1-(4-methylthiophenyl)-2-morpholinyl-1-propanone, 0.02 parts of 2-isopropylthioxanthone, 0.02 parts of bis(1-(2,4-difluorophenyl)-3-pyrrolyl)titanocene;

[0092] 0.01 parts of ultraviolet absorber: 0.005 parts of 2,4-bis(2,4-dimethylphenyl)-6-(2-hydroxy-4-n-octyloxyphenyl)-1,3,5-triazine, 0.003 parts of 3,5-di-tert-butyl-4-hydroxybenzoic acid-2,4-di-tert-butylphenyl ester, and 0.002 parts of 2-(4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl)-5-methoxyphenol;

[0093] 0.05 parts of spacer microspheres: 0.01 parts of PS-Fe3O4 nanometer microspheres, 0.01 parts of α-cyclodextrin modified SiO2 nanometer microspheres, 0.01 parts of silanol group modified ferroferric oxide magnetic nanometer microspheres, 0.01 parts of silica microspheres, and 0.01 parts of alumina microspheres, the size of the microspheres is 1 μm;

[0094] Under the condition of vacuum at 25℃, a layer of 1 μm thick liquid crystal / ultraviolet polymerizable monomer mixture is uniformly coated on the other side of the third transparent substrate layer by means of scraping (the scraping speed is 0.5 cm / S -1 ), after the coating is completed, the second transparent substrate layer is attached on the surface of the liquid crystal / ultraviolet polymerizable monomer mixture, and ultraviolet light with a wavelength of 360 nm and an illumination intensity of 1 mW / cm 2 is used for irradiation for 5 min, to obtain the second polymer composite liquid crystal layer;

[0095] 3) Preparation of the first polymer composite liquid crystal layer

[0096] A nematic liquid crystal, an optical rotation control agent mixture, an ultraviolet polymerizable monomer mixture, a photoinitiator mixture, an ultraviolet absorber, and a spacer microsphere were mixed in the following weight parts to obtain a uniform and stable liquid crystal / ultraviolet polymerizable monomer mixture:

[0097] The liquid crystal / ultraviolet polymerizable monomer mixture was, for example, as follows:

[0098] 50 parts of a nematic liquid crystal;

[0099] 2 parts of an optical rotation control agent mixture: 0.2 parts of (R)-(-)-methyl 3-hydroxyisobutyrate, 0.2 parts of (R)-(+)-1-phenylethanol, 0.2 parts of (S)-(-)-1-phenylethanol, 0.2 parts of (S)-2-chloro-4-methylvaleric acid, 0.2 parts of R-2-octanol, and 1 part of S-(-)-2-methyl-1-butanol;

[0100] 15 parts of an ultraviolet polymerizable monomer mixture: 4 parts of 1,6-hexanediol diacrylate, 4 parts of dipropylene glycol diacrylate, 4 parts of cyclo-trihydroxymethylpropane trimethacrylate, and 3 parts of pentaerythritol triacrylate;

[0101] 0.1 parts of a photoinitiator mixture: 0.02 parts of 1-hydroxycyclohexyl phenyl ketone, 0.02 parts of 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)butanone, 0.02 parts of 2-methyl-1-(4-methylthiophenyl)-2-morpholinyl-1-propanone, 0.02 parts of 2-isopropylthioxanthone, and 0.02 parts of bis(1-(2,4-difluorophenyl)-3-pyrrolyl)titanocene;

[0102] 0.01 parts of an ultraviolet absorber: 0.005 parts of 2,4-bis(2,4-dimethylphenyl)-6-(2-hydroxy-4-n-octyloxyphenyl)-1,3,5-triazine, 0.003 parts of 3,5-di-tert-butyl-4-hydroxybenzoic acid-2,4-di-tert-butylphenyl ester, and 0.002 parts of 2-(4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl)-5-methoxyphenol;

[0103] 0.05 parts of a spacer microsphere: 0.01 parts of PS-Fe3O4 nanomicrosphere, 0.01 parts of α-cyclodextrin-modified SiO2 nanomicrosphere, 0.01 parts of silanol-modified Fe3O4 magnetic nanomicrosphere, 0.01 parts of SiO2 microsphere, and 0.01 parts of Al2O3 microsphere, and the microspheres had a size of 1 μm;

[0104] The liquid crystal / ultraviolet polymerizable monomer mixture was coated at 25°C under vacuum conditions by using a doctor blade (coating speed: 0.5 cm / s -1) in the same manner, a 1 μm thick layer of the liquid crystal / ultraviolet polymerizable monomer mixture was coated on the other side of the second transparent substrate layer, after the coating was completed, the conductive surface of the first transparent substrate layer was attached to the surface of the liquid crystal / ultraviolet polymerizable monomer mixture, ultraviolet light with a wavelength of 360 nm and an illumination intensity of 1 mW / cm2was used to irradiate for 5 min, and a first polymer composite liquid crystal layer was obtained (at this time, a complete writing device was obtained); 2 The writing device was used to write a text, and the text was read by a laser beam with a wavelength of 780 nm.

[0105] Embodiment 2:

[0106] 1) Preparation of the third polymer composite liquid crystal layer

[0107] The nematic liquid crystal, the optical rotation control agent mixture, the ultraviolet polymerizable monomer mixture, the photoinitiator mixture, the ultraviolet absorber, and the spacer microspheres were mixed in the following weight proportions to obtain a uniform and stable liquid crystal / ultraviolet polymerizable monomer mixture.

[0108] The liquid crystal / ultraviolet polymerizable monomer mixture had the following proportions:

[0109] 55 parts of nematic liquid crystal;

[0110] 5 parts of optical rotation control agent mixture: 1 part of (R)-(-)-methyl 3-hydroxyisobutyrate, 1 part of (R)-(+)-1-phenylethanol, 1 part of (S)-(-)-1-phenylethanol, 1 part of (S)-2-chloro-4-methylvaleric acid, 0.5 part of R-2-octanol, and 0.5 part of S-(-)-2-methyl-1-butanol;

[0111] 30 parts of ultraviolet polymerizable monomer mixture: 8 parts of 1,6-hexanediol diacrylate, 8 parts of dipropylene glycol diacrylate, 7 parts of cyclo-trihydroxymethyl propane trimethyl acrylate, and 7 parts of pentaerythritol triacrylate;

[0112] 2 parts of photoinitiator mixture: 0.4 parts of 1-hydroxycyclohexyl phenyl ketone, 0.4 parts of 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl) butanone, 0.4 parts of 2-methyl-1-(4-methylthiophenyl)-2-morpholinyl-1-propanone, 0.4 parts of 2-isopropylthioxanthone, and 0.4 parts of bis(1-(2,4-difluorophenyl)-3-pyrrolyl) titanium;

[0113] 0.1 parts of ultraviolet absorber: 0.05 parts of 2,4-bis(2,4-dimethylphenyl)-6-(2-hydroxy-4-n-octyloxyphenyl)-1,3,5-triazine, 0.03 parts of 3,5-di-tert-butyl-4-hydroxybenzoic acid-2,4-di-tert-butylphenyl ester, and 0.02 parts of 2-(4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl)-5-methoxyphenol;

[0114] 0.2 parts of spacer microspheres: 0.04 parts of PS-Fe3O4nanomicrospheres, 0.04 parts of α-cyclodextrin modified SiO2nanomicrospheres, 0.04 parts of silanol group modified Fe3O4magnetic nanomicrospheres, 0.04 parts of SiO2microspheres and 0.04 parts of Al2O3microspheres, the size of the microspheres is 3 μm;

[0115] Under the condition of vacuum at 27℃, a 3 μm thick liquid crystal / UV polymerizable monomer mixture was uniformly coated on the conductive surface of the fourth substrate layer by means of scraping (the scraping speed is 1 cm / S -1 ) and after the coating, the third transparent substrate layer was attached on the surface of the liquid crystal / UV polymerizable monomer mixture, and a third polymer composite liquid crystal layer was obtained by using UV light with wavelength of 365 nm and light intensity of 15 mW / cm 2 for 10 min irradiation.

[0116] 2) Preparation of the second polymer composite liquid crystal layer

[0117] The nematic liquid crystal, optical control agent mixture, UV polymerizable monomer mixture, photoinitiator mixture, UV absorber and spacer microspheres were mixed according to the following weight parts to obtain a uniform and stable liquid crystal / UV polymerizable monomer mixture.

[0118] The liquid crystal / UV polymerizable monomer mixture is as follows:

[0119] 55 parts of nematic liquid crystal;

[0120] 7 parts of optical control agent mixture: 1 part of (R)-(-)-methyl 3-hydroxyisobutyrate, 1 part of (R)-(+)-1-phenylethanol, 1 part of (S)-(-)-1-phenylethanol, 1 part of (S)-2-chloro-4-methylvaleric acid, 1 part of R-2-octanol, 2 parts of S-(-)-2-methyl-1-butanol;

[0121] 30 parts of UV polymerizable monomer mixture: 8 parts of 1,6-hexanediol diacrylate, 8 parts of dipropylene glycol diacrylate, 8 parts of cyclo-trihydroxymethyl propane trimethyl acrylate and 6 parts of pentaerythritol triacrylate;

[0122] 2 parts of photoinitiator mixture: 0.4 parts of 1-hydroxycyclohexyl phenyl ketone, 0.4 parts of 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl) butanone, 0.4 parts of 2-methyl-1-(4-methylthiophenyl)-2-morpholinyl-1-propanone, 0.4 parts of 2-isopropylthioxanthone, 0.4 parts of bis(1-(2,4-difluorophenyl)-3-pyrrolyl) titanium;

[0123] 0.1 part of ultraviolet absorber: 0.05 part of 2,4-bis(2,4-dimethylphenyl)-6-(2-hydroxy-4-n-octyloxyphenyl)-1,3,5-triazine, 0.03 part of 3,5-di-tert-butyl-4-hydroxybenzoic acid-2,4-di-tert-butylphenyl ester and 0.02 part of 2-(4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl)-5-methoxyphenol;

[0124] 0.2 parts of spacer microspheres: 0.04 parts of PS-Fe3O4nanomicrospheres, 0.04 parts of α-cyclodextrin modified SiO2nanomicrospheres, 0.04 parts of silanol group modified Fe3O4magnetic nanomicrospheres, 0.04 parts of SiO2microspheres and 0.04 parts of Al2O3microspheres, the size of the microspheres is 3 μm;

[0125] Under the condition of vacuum at 27℃, a layer of 3 μm thick liquid crystal / ultraviolet polymerizable monomer mixture is uniformly coated on the other side of the third transparent substrate layer by means of scraping (the scraping speed is 1 cm / S -1 ) and after the coating is completed, the second transparent substrate layer is attached on the surface of the liquid crystal / ultraviolet polymerizable monomer mixture, and a wavelength of 365 nm, light intensity of 15 mW / cm 2 of ultraviolet light is used for irradiation for 10 min to obtain the second polymer composite liquid crystal layer;

[0126] 3) Preparation of the first polymer composite liquid crystal layer

[0127] The nematic liquid crystal, optical control agent mixture, ultraviolet polymerizable monomer mixture, photoinitiator mixture, ultraviolet absorber and spacer microspheres are mixed according to the following weight parts to obtain a uniform and stable liquid crystal / ultraviolet polymerizable monomer mixture;

[0128] The liquid crystal / ultraviolet polymerizable monomer mixture is as follows:

[0129] 55 parts of nematic liquid crystal;

[0130] 9 parts of optical control agent mixture: 1.5 parts of (R)-(-)-methyl 3-hydroxyisobutyrate, 1.5 parts of (R)-(+)-1-phenylethanol, 1.5 parts of (S)-(-)-1-phenylethanol, 1.5 parts of (S)-2-chloro-4-methylvaleric acid, 1.5 parts of R-2-octanol and 1.5 parts of S-(-)-2-methyl-1-butanol;

[0131] 30 parts of ultraviolet polymerizable monomer mixture: 8 parts of 1,6-hexanediol diacrylate, 8 parts of dipropylene glycol diacrylate, 8 parts of cyclo-trihydroxymethyl propane trimethyl acrylate and 6 parts of pentaerythritol triacrylate;

[0132] 2 parts of photoinitiator mixture: 0.4 parts of 1-hydroxycyclohexyl phenyl ketone, 0.4 parts of 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl) butanone, 0.4 parts of 2-methyl-1-(4-methylthiophenyl)-2-morpholinyl-1-propanone, 0.4 parts of 2-isopropylthioxanthone, 0.4 parts of bis(1-(2,4-difluorophenyl)-3-pyrrolyl)titanium dioxane;

[0133] 0.1 parts of ultraviolet absorber: 0.05 parts of 2,4-bis(2,4-dimethylphenyl)-6-(2-hydroxy-4-n-octyloxyphenyl)-1,3,5-triazine, 0.03 parts of 3,5-di-tert-butyl-4-hydroxybenzoic acid-2,4-di-tert-butylphenyl ester, and 0.02 parts of 2-(4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl)-5-methoxyphenol;

[0134] 0.2 parts of spacer microspheres: 0.04 parts of PS-Fe3O4 nanometer microspheres, 0.04 parts of α-cyclodextrin modified SiO2 nanometer microspheres, 0.04 parts of silanol group modified Fe3O4 magnetic nanometer microspheres, 0.04 parts of silica microspheres, and 0.04 parts of alumina microspheres, the microspheres have a size of 3 μm;

[0135] Under vacuum conditions at 27°C, a 3 μm thick layer of liquid crystal / ultraviolet polymerizable monomer mixture was uniformly coated on the other side of the second transparent substrate layer by means of scraping (scraping speed of 1 cm / S -1 ) and, after coating, the conductive surface of the first transparent substrate layer was attached to the surface of the liquid crystal / ultraviolet polymerizable monomer mixture, and a wavelength of 365 nm, light intensity of 15 mW / cm 2 was used for irradiation for 10 min to obtain the first polymer composite liquid crystal layer (at this time, a complete writing device was obtained);

[0136] Embodiment 3:

[0137] 1) Preparation of the third polymer composite liquid crystal layer

[0138] The nematic liquid crystal, optical control agent mixture, ultraviolet polymerizable monomer mixture, photoinitiator mixture, ultraviolet absorber, and spacer microspheres were mixed in the following weight parts to obtain a uniform and stable liquid crystal / ultraviolet polymerizable monomer mixture;

[0139] The liquid crystal / ultraviolet polymerizable monomer mixture had the following proportions:

[0140] 60 parts of nematic liquid crystal;

[0141] 10 parts of optical control agent mixture: 2 parts of (R)-(-)-methyl 3-hydroxyisobutyrate, 2 parts of (R)-(+)-1-phenylethanol, 2 parts of (S)-(-)-1-phenylethanol, 2 parts of (S)-2-chloro-4-methylvaleric acid, 1 part of R-2-octanol, 1 part of S-(-)-2-methyl-1-butanol;

[0142] 45 parts of ultraviolet polymerizable monomer mixture: 11 parts of 1,6-hexanediol diacrylate, 11 parts of dipropylene glycol diacrylate, 11 parts of cyclotrimethylolpropane trimethacrylate, and 12 parts of pentaerythritol triacrylate;

[0143] 1 part of photoinitiator mixture: 0.2 parts of 1-hydroxycyclohexyl phenyl ketone, 0.2 parts of 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl) butanone, 0.2 parts of 2-methyl-1-(4-methylthiophenyl)-2-morpholinyl-1-propanone, 0.2 parts of 2-isopropylthioxanthone, 0.2 parts of bis(1-(2,4-difluorophenyl)-3-pyrrolyl)titanocene;

[0144] 0.6 parts of ultraviolet absorber: 0.2 parts of 2,4-bis(2,4-dimethylphenyl)-6-(2-hydroxy-4-n-octyloxyphenyl)-1,3,5-triazine, 0.2 parts of 3,5-di-tert-butyl-4-hydroxybenzoic acid-2,4-di-tert-butylphenyl ester, and 0.2 parts of 2-(4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl)-5-methoxyphenol;

[0145] 0.6 parts of spacer microspheres: 0.12 parts of PS-Fe3O4 nanomicrospheres, 0.12 parts of α-cyclodextrin modified SiO2 nanomicrospheres, 0.12 parts of silanol group modified Fe3O4 magnetic nanomicrospheres, 0.12 parts of silica microspheres, and 0.12 parts of alumina microspheres, with a microsphere size of 6 μm;

[0146] Under vacuum conditions at 30°C, a 6 μm thick layer of liquid crystal / ultraviolet polymerizable monomer mixture was uniformly coated on the conductive surface of the fourth substrate layer by means of scraping (scraping speed of 3 cm / S -1 ) and, after coating, the third transparent substrate layer was attached to the surface of the liquid crystal / ultraviolet polymerizable monomer mixture, which was irradiated for 15 min using ultraviolet light with a wavelength of 373 nm and an illumination intensity of 30 mW / cm 2 , to obtain a third polymer composite liquid crystal layer;

[0147] 2) Preparation of a second polymer composite liquid crystal layer

[0148] The nematic liquid crystal, the optical rotation control agent mixture, the ultraviolet polymerizable monomer mixture, the photoinitiator mixture, the ultraviolet absorber and the spacer microspheres are mixed in the following weight parts to obtain a uniform and stable liquid crystal / ultraviolet polymerizable monomer mixture;

[0149] The liquid crystal / ultraviolet polymerizable monomer mixture is as follows:

[0150] 60 parts of nematic liquid crystal;

[0151] 12 parts of optical rotation control agent mixture: 2 parts of (R)-(-)-methyl 3-hydroxyisobutyrate, 2 parts of (R)-(+)-1-phenylethanol, 2 parts of (S)-(-)-1-phenylethanol, 2 parts of (S)-2-chloro-4-methylvaleric acid, 2 parts of R-2-octanol, 2 parts of S-(-)-2-methyl-1-butanol;

[0152] 45 parts of ultraviolet polymerizable monomer mixture: 11 parts of 1,6-hexanediol diacrylate, 11 parts of dipropylene glycol diacrylate, 11 parts of cyclotrimethylolpropane trimethacrylate and 12 parts of pentaerythritol triacrylate;

[0153] 1 part of photoinitiator mixture: 0.2 parts of 1-hydroxycyclohexyl phenyl ketone, 0.2 parts of 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl) butanone, 0.2 parts of 2-methyl-1-(4-methylthiophenyl)-2-morpholinyl-1-propanone, 0.2 parts of 2-isopropylthioxanthone, 0.2 parts of bis(1-(2,4-difluorophenyl)-3-pyrrolyl) titanium;

[0154] 0.6 parts of ultraviolet absorber: 0.2 parts of 2,4-bis(2,4-dimethylphenyl)-6-(2-hydroxy-4-n-octyloxyphenyl)-1,3,5-triazine, 0.2 parts of 3,5-di-tert-butyl-4-hydroxybenzoic acid-2,4-di-tert-butylphenyl ester and 0.2 parts of 2-(4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl)-5-methoxyphenol;

[0155] 0.6 parts of spacer microspheres: 0.12 parts of PS-Fe3O4 nanomicrospheres, 0.12 parts of α-cyclodextrin modified SiO2 nanomicrospheres, 0.12 parts of silanol group modified Fe3O4 magnetic nanomicrospheres, 0.12 parts of SiO2 microspheres and 0.12 parts of Al2O3 microspheres, and the size of the microspheres is 6 μm;

[0156] The liquid crystal / ultraviolet polymerizable monomer mixture is coated on the substrate at 30°C under vacuum condition by using a doctor blade (the coating speed is 3 cm / S -1) in the same manner, a 6 μm thick layer of liquid crystal / ultraviolet polymerizable monomer mixture was coated on the other side of the third transparent substrate layer, after the coating was completed, the second transparent substrate layer was attached to the surface of the liquid crystal / ultraviolet polymerizable monomer mixture, using ultraviolet light with a wavelength of 373 nm and an illumination intensity of 30 mW / cm2, the second polymer composite liquid crystal layer was obtained after irradiation for 15 min; 2

[0157] 3) Preparation of the first polymer composite liquid crystal layer

[0158] The nematic liquid crystal, optical control agent mixture, ultraviolet polymerizable monomer mixture, photoinitiator mixture, ultraviolet absorber and spacer microspheres were mixed in the following weight parts to obtain a uniform and stable liquid crystal / ultraviolet polymerizable monomer mixture;

[0159] The liquid crystal / ultraviolet polymerizable monomer mixture was, for example, as follows:

[0160] 60 parts of nematic liquid crystal;

[0161] 15 parts of optical control agent mixture: 2 parts of (R)-(-)-methyl 3-hydroxyisobutyrate, 1 part of (R)-(+)-1-phenylethanol, 3 parts of (S)-(-)-1-phenylethanol, 3 parts of (S)-2-chloro-4-methylvaleric acid, 3 parts of R-2-octanol and 3 parts of S-(-)-2-methyl-1-butanol;

[0162] 40 parts of ultraviolet polymerizable monomer mixture: 10 parts of 1,6-hexanediol diacrylate, 10 parts of dipropylene glycol diacrylate, 10 parts of cyclo-trihydroxymethylpropane trimethacrylate and 10 parts of pentaerythritol triacrylate;

[0163] 1 part of photoinitiator mixture: 0.2 parts of 1-hydroxycyclohexyl phenyl ketone, 0.2 parts of 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl) butanone, 0.2 parts of 2-methyl-1-(4-methylthiophenyl)-2-morpholinyl-1-propanone, 0.2 parts of 2-isopropylthioxanthone and 0.2 parts of bis(1-(2,4-difluorophenyl)-3-pyrrolyl) titanium;

[0164] 0.6 parts of ultraviolet absorber: 0.2 parts of 2,4-bis(2,4-dimethylphenyl)-6-(2-hydroxy-4-n-octyloxyphenyl)-1,3,5-triazine, 0.2 parts of 3,5-di-tert-butyl-4-hydroxybenzoic acid-2,4-di-tert-butylphenyl ester and 0.2 parts of 2-(4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl)-5-methoxyphenol;

[0165] ​0.6 parts of spacer microspheres: 0.12 parts of PS-Fe3O4nanomicrospheres, 0.12 parts of α-cyclodextrin modified SiO2nanomicrospheres, 0.12 parts of silanol group modified Fe3O4magnetic nanomicrospheres, 0.12 parts of SiO2microspheres and 0.12 parts of Al2O3microspheres, the size of the microspheres is 6 μm;

[0166] At 30°C, under vacuum condition, a 6 μm thick layer of liquid crystal / ultraviolet polymerizable monomer mixture was uniformly coated on the other side of the second transparent substrate layer by means of scraping (the scraping speed is 3 cm / S -1 ) and after the coating was completed, the conductive surface of the first transparent substrate layer was attached on the surface of the liquid crystal / ultraviolet polymerizable monomer mixture, and a wavelength of 373 nm, light intensity of 30 mW / cm 2 was used for ultraviolet light irradiation for 15 min, to obtain the first polymer composite liquid crystal layer (at this time, the complete writing device was obtained)

[0167] Embodiment 4:

[0168] 1) Preparation of the third polymer composite liquid crystal layer

[0169] The nematic liquid crystal, optical control agent mixture, ultraviolet polymerizable monomer mixture, photoinitiator mixture, ultraviolet absorber and spacer microspheres were mixed according to the following weight parts to obtain a uniform and stable liquid crystal / ultraviolet polymerizable monomer mixture;

[0170] The liquid crystal / ultraviolet polymerizable monomer mixture is, for example, as follows:

[0171] 65 parts of nematic liquid crystal;

[0172] 25 parts of optical control agent mixture: 5 parts of (R)-(-)-methyl 3-hydroxyisobutyrate, 4 parts of (R)-(+)-1-phenylethanol, 4 parts of (S)-(-)-1-phenylethanol, 4 parts of (S)-2-chloro-4-methylvaleric acid, 4 parts of R-2-octanol, 4 parts of S-(-)-2-methyl-1-butanol;

[0173] 65 parts of ultraviolet polymerizable monomer mixture: 15 parts of 1,6-hexanediol diacrylate, 15 parts of dipropylene glycol diacrylate, 15 parts of cyclotrimethylolpropane trimethacrylate and 20 parts of pentaerythritol triacrylate;

[0174] 0.8 parts of photoinitiator mixture: 0.16 parts of 1-hydroxycyclohexyl phenyl ketone, 0.16 parts of 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl) butanone, 0.16 parts of 2-methyl-1-(4-methylthiophenyl)-2-morpholinyl-1-propanone, 0.16 parts of 2-isopropylthioxanthone, 0.16 parts of bis(1-(2,4-difluorophenyl)-3-pyrrolyl)titanocene;

[0175] 0.7 parts of ultraviolet absorber: 0.2 parts of 2,4-bis(2,4-dimethylphenyl)-6-(2-hydroxy-4-n-octyloxyphenyl)-1,3,5-triazine, 0.2 parts of 3,5-di-tert-butyl-4-hydroxybenzoic acid-2,4-di-tert-butylphenyl ester and 0.3 parts of 2-(4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl)-5-methoxyphenol;

[0176] 0.7 parts of spacer microspheres: 0.1 parts of PS-Fe3O4nanomicrospheres, 0.1 parts of a-cyclodextrin modified SiO2nanomicrospheres, 0.2 parts of silanol group modified Fe3O4magnetic nanomicrospheres, 0.2 parts of SiO2microspheres and 0.1 parts of Al2O3microspheres, the size of the microspheres is 10 μm;

[0177] Under the condition of vacuum and 33°C, a 10 μm thick liquid crystal / ultraviolet polymerizable monomer mixture was uniformly coated on the conductive surface of the fourth substrate layer by means of scraping (the scraping speed is 5 cm / S -1 ) and after the coating, the third transparent substrate layer was attached on the surface of the liquid crystal / ultraviolet polymerizable monomer mixture, and a third polymer composite liquid crystal layer was obtained by using ultraviolet light with a wavelength of 380 nm and an illumination intensity of 50 mW / cm 2 for 20 min;

[0178] 2) Preparation of the second polymer composite liquid crystal layer

[0179] The nematic liquid crystal, the optical control agent mixture, the ultraviolet polymerizable monomer mixture, the photoinitiator mixture, the ultraviolet absorber and the spacer microspheres were mixed in the following weight parts to obtain a uniform and stable liquid crystal / ultraviolet polymerizable monomer mixture;

[0180] The liquid crystal / ultraviolet polymerizable monomer mixture is as follows:

[0181] 65 parts of nematic liquid crystal;

[0182] 27 parts of optical control agent mixture: 5 parts of (R)-(-)-methyl 3-hydroxyisobutyrate, 5 parts of (R)-(+)-1-phenylethanol, 5 parts of (S)-(-)-1-phenylethanol, 4 parts of (S)-2-chloro-4-methylvaleric acid, 4 parts of R-2-octanol and 4 parts of S-(-)-2-methyl-1-butanol;

[0183] 65 parts of ultraviolet polymerizable monomer mixture: 10 parts of 1,6-hexanediol diacrylate, 15 parts of dipropylene glycol diacrylate, 20 parts of cyclo-trihydroxymethyl propane trimethyl acrylate and 20 parts of pentaerythritol triacrylate;

[0184] 0.8 parts of a photoinitiator mixture: 0.16 parts of 1-hydroxycyclohexyl phenyl ketone, 0.16 parts of 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl) butanone, 0.16 parts of 2-methyl-1-(4-methylthiophenyl)-2-morpholinyl-1-propanone, 0.16 parts of 2-isopropylthioxanthone, 0.16 parts of bis(1-(2,4-difluorophenyl)-3-pyrrolyl)titanium;

[0185] 0.7 parts of an ultraviolet absorber: 0.2 parts of 2,4-bis(2,4-dimethylphenyl)-6-(2-hydroxy-4-n-octyloxyphenyl)-1,3,5-triazine, 0.2 parts of 3,5-di-tert-butyl-4-hydroxybenzoic acid-2,4-di-tert-butylphenyl ester, and 0.3 parts of 2-(4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl)-5-methoxyphenol;

[0186] 0.7 parts of a spacer microsphere: 0.1 parts of PS-Fe3O4 nanomicrosphere, 0.1 parts of α-cyclodextrin modified SiO2 nanomicrosphere, 0.2 parts of silanol group modified Fe3O4 magnetic nanomicrosphere, 0.2 parts of silica microsphere, and 0.1 parts of alumina microsphere, the microsphere size being 10 μm;

[0187] Under vacuum condition at 33°C, a 10 μm thick liquid crystal / ultraviolet polymerizable monomer mixture was uniformly coated on the other side of the third transparent substrate layer by means of scraping (the scraping speed being 5 cm / S -1 ) and, after coating, the second transparent substrate layer was attached to the surface of the liquid crystal / ultraviolet polymerizable monomer mixture, and a wavelength of 380 nm, a light intensity of 50 mW / cm 2 was used for irradiation for 20 min to obtain the second polymer composite liquid crystal layer;

[0188] 3) Preparation of the first polymer composite liquid crystal layer

[0189] The nematic liquid crystal, the optical rotation control agent mixture, the ultraviolet polymerizable monomer mixture, the photoinitiator mixture, the ultraviolet absorber, and the spacer microsphere were mixed in the following weight parts to obtain a uniform and stable liquid crystal / ultraviolet polymerizable monomer mixture.

[0190] The liquid crystal / ultraviolet polymerizable monomer mixture was, for example, as follows:

[0191] 65 parts of nematic liquid crystal;

[0192] 29 parts of an optical rotation control agent mixture: 5 parts of (R)-(-)-methyl 3-hydroxyisobutyrate, 5 parts of (R)-(+)-1-phenylethanol, 5 parts of (S)-(-)-1-phenylethanol, 5 parts of (S)-2-chloro-4-methylpentanoic acid, 5 parts of R-2-octanol, and 4 parts of S-(-)-2-methyl-1-butanol;

[0193] 65 parts of UV polymerizable monomer mixture: 10 parts of 1,6-hexanediol diacrylate, 15 parts of dipropylene glycol diacrylate, 20 parts of cyclo-trihydroxymethyl propane trimethacrylate and 20 parts of pentaerythritol triacrylate;

[0194] 0.8 parts of photoinitiator mixture: 0.16 parts of 1-hydroxycyclohexyl phenyl ketone, 0.16 parts of 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl) butanone, 0.16 parts of 2-methyl-1-(4-methylthiophenyl)-2-morpholinyl-1-propanone, 0.16 parts of 2-isopropylthioxanthone, 0.16 parts of bis(1-(2,4-difluorophenyl)-3-pyrrolyl)titanium;

[0195] 0.7 parts of UV absorber: 0.2 parts of 2,4-bis(2,4-dimethylphenyl)-6-(2-hydroxy-4-n-octyloxyphenyl)-1,3,5-triazine, 0.2 parts of 3,5-di-tert-butyl-4-hydroxybenzoic acid-2,4-di-tert-butylphenyl ester and 0.3 parts of 2-(4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl)-5-methoxyphenol;

[0196] 0.7 parts of spacer microspheres: 0.1 parts of PS-Fe3O4nanometer microspheres, 0.1 parts of α-cyclodextrin modified SiO2nanometer microspheres, 0.1 parts of silanol group modified Fe3O4magnetic nanometer microspheres, 0.2 parts of silica microspheres and 0.2 parts of alumina microspheres, the microspheres have a size of 10 μm;

[0197] Under vacuum condition at 33°C, a layer of 10 μm thick liquid crystal / UV polymerizable monomer mixture was uniformly coated on the other side of the second transparent substrate layer by means of scraping (the scraping speed was 5 cm / S -1 ) and after the coating was completed, the conductive surface of the first transparent substrate layer was attached on the surface of the liquid crystal / UV polymerizable monomer mixture, and then the first polymer composite liquid crystal layer was obtained by means of irradiation for 20 min using UV light with a wavelength of 380 nm and an illumination intensity of 50 mW / cm 2

[0198] Embodiment 5:

[0199] 1) Preparation of the third polymer composite liquid crystal layer

[0200] The nematic liquid crystal, the optical rotation control agent mixture, the UV polymerizable monomer mixture, the photoinitiator mixture, the UV absorber and the spacer microspheres were mixed according to the following weight parts to obtain a uniform and stable liquid crystal / UV polymerizable monomer mixture;

[0201] The liquid crystal / UV polymerizable monomer mixture had the following proportions:​

[0202] 75 parts of nematic liquid crystal;

[0203] 21 parts of optical control agent mixture: 3 parts of (R)-(-)-methyl 3-hydroxyisobutyrate, 3 parts of (R)-(+)-1-phenylethanol, 3 parts of (S)-(-)-1-phenylethanol, 4 parts of (S)-2-chloro-4-methylvaleric acid, 4 parts of R-2-octanol, 4 parts of S-(-)-2-methyl-1-butanol;

[0204] 70 parts of UV polymerizable monomer mixture: 15 parts of 1,6-hexanediol diacrylate, 20 parts of dipropylene glycol diacrylate, 15 parts of cyclotrimethylolpropane trimethacrylate, and 20 parts of pentaerythritol triacrylate;

[0205] 0.6 parts of photoinitiator mixture: 0.12 parts of 1-hydroxycyclohexyl phenyl ketone, 0.12 parts of 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl) butanone, 0.12 parts of 2-methyl-1-(4-methylthiophenyl)-2-morpholinyl-1-propanone, 0.12 parts of 2-isopropylthioxanthone, 0.12 parts of bis(1-(2,4-difluorophenyl)-3-pyrrolyl)titanocene;

[0206] 0.8 parts of UV absorber: 0.3 parts of 2,4-bis(2,4-dimethylphenyl)-6-(2-hydroxy-4-n-octyloxyphenyl)-1,3,5-triazine, 0.2 parts of 3,5-di-tert-butyl-4-hydroxybenzoic acid-2,4-di-tert-butylphenyl ester, and 0.3 parts of 2-(4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl)-5-methoxyphenol;

[0207] 0.8 parts of spacer microspheres: 0.1 parts of PS-Fe3O4 nanoscale microspheres, 0.2 parts of α-cyclodextrin modified SiO2 nanoscale microspheres, 0.2 parts of silanol group modified Fe3O4 magnetic nanoscale microspheres, 0.2 parts of silica microspheres, and 0.1 parts of alumina microspheres, with a microsphere size of 13 μm;

[0208] Under vacuum conditions at 35°C, a 13 μm thick layer of liquid crystal / UV polymerizable monomer mixture was uniformly coated on the conductive surface of the fourth substrate layer using a doctor blade (doctor blade speed of 7 cm / s -1 ) method. After coating, the third transparent substrate layer was attached to the surface of the liquid crystal / UV polymerizable monomer mixture, and a wavelength of 390 nm, light intensity of 70 mW / cm 2 ) UV light was used for irradiation for 25 min to obtain a third polymer composite liquid crystal layer;

[0209] 2) Preparation of a second polymer composite liquid crystal layer

[0210] The nematic liquid crystal, the optical rotation control agent mixture, the ultraviolet polymerizable monomer mixture, the photoinitiator mixture, the ultraviolet absorber and the spacer microspheres are mixed in the following weight parts to obtain a uniform and stable liquid crystal / ultraviolet polymerizable monomer mixture:

[0211] The liquid crystal / ultraviolet polymerizable monomer mixture is, for example, as follows:

[0212] 75 parts of nematic liquid crystal;

[0213] 23 parts of optical rotation control agent mixture: 3 parts of (R)-(-)-methyl 3-hydroxyisobutyrate, 4 parts of (R)-(+)-1-phenylethanol, 4 parts of (S)-(-)-1-phenylethanol, 4 parts of (S)-2-chloro-4-methylvaleric acid, 4 parts of R-2-octanol, 4 parts of S-(-)-2-methyl-1-butanol;

[0214] 70 parts of ultraviolet polymerizable monomer mixture: 10 parts of 1,6-hexanediol diacrylate, 20 parts of dipropylene glycol diacrylate, 20 parts of cyclotrimethylolpropane trimethacrylate and 20 parts of pentaerythritol triacrylate;

[0215] 0.6 parts of photoinitiator mixture: 0.2 parts of 1-hydroxycyclohexyl phenyl ketone, 0.1 parts of 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl) butanone, 0.1 parts of 2-methyl-1-(4-methylthiophenyl)-2-morpholinyl-1-propanone, 0.1 parts of 2-isopropylthioxanthone, 0.1 parts of bis(1-(2,4-difluorophenyl)-3-pyrrolyl) titanium;

[0216] 0.8 parts of ultraviolet absorber: 0.2 parts of 2,4-bis(2,4-dimethylphenyl)-6-(2-hydroxy-4-n-octyloxyphenyl)-1,3,5-triazine, 0.3 parts of 3,5-di-tert-butyl-4-hydroxybenzoic acid-2,4-di-tert-butylphenyl ester and 0.3 parts of 2-(4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl)-5-methoxyphenol;

[0217] 0.8 parts of spacer microspheres: 0.1 parts of PS-Fe3O4 nanoscale microspheres, 0.2 parts of α-cyclodextrin modified SiO2 nanoscale microspheres, 0.2 parts of silanol group modified Fe3O4 magnetic nanoscale microspheres, 0.2 parts of SiO2 microspheres and 0.1 parts of Al2O3 microspheres, and the size of the microspheres is 13 μm;

[0218] The liquid crystal / ultraviolet polymerizable monomer mixture is coated on the substrate by using a doctor blade at a speed of 7 cm / s at 35°C under vacuum conditions -1) in the same manner, a 13 μm thick layer of the liquid crystal / ultraviolet polymerizable monomer mixture was uniformly coated on the other side of the third transparent substrate layer, after the coating was completed, the second transparent substrate layer was attached to the surface of the liquid crystal / ultraviolet polymerizable monomer mixture, and ultraviolet light with a wavelength of 390 nm and an illumination intensity of 70 mW / cm2was used to irradiate for 25 min, thereby obtaining a second polymer composite liquid crystal layer; 2

[0219] 3) Preparation of the first polymer composite liquid crystal layer

[0220] The nematic liquid crystal, the optical rotation control agent mixture, the ultraviolet polymerizable monomer mixture, the photoinitiator mixture, the ultraviolet absorber, and the spacer microspheres were mixed in the following weight proportions to obtain a uniform and stable liquid crystal / ultraviolet polymerizable monomer mixture:

[0221] The liquid crystal / ultraviolet polymerizable monomer mixture had the following proportions:

[0222] 75 parts of nematic liquid crystal;

[0223] 25 parts of optical rotation control agent mixture: 5 parts of (R)-(-)-methyl 3-hydroxyisobutyrate, 5 parts of (R)-(+)-1-phenylethanol, 5 parts of (S)-(-)-1-phenylethanol, 5 parts of (S)-2-chloro-4-methylvaleric acid, 2 parts of R-2-octanol, and 3 parts of S-(-)-2-methyl-1-butanol;

[0224] 70 parts of ultraviolet polymerizable monomer mixture: 10 parts of 1,6-hexanediol diacrylate, 20 parts of dipropylene glycol diacrylate, 20 parts of cyclo-trihydroxymethylpropane trimethacrylate, and 20 parts of pentaerythritol triacrylate;

[0225] 0.6 parts of photoinitiator mixture: 0.2 parts of 1-hydroxycyclohexyl phenyl ketone, 0.1 parts of 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl) butanone, 0.1 parts of 2-methyl-1-(4-methylthiophenyl)-2-morpholinyl-1-propanone, 0.1 parts of 2-isopropylthioxanthone, and 0.1 parts of bis(1-(2,4-difluorophenyl)-3-pyrrolyl)titanium;

[0226] 0.8 parts of ultraviolet absorber: 0.3 parts of 2,4-bis(2,4-dimethylphenyl)-6-(2-hydroxy-4-n-octyloxyphenyl)-1,3,5-triazine, 0.2 parts of 3,5-di-tert-butyl-4-hydroxybenzoic acid-2,4-di-tert-butylphenyl ester, and 0.3 parts of 2-(4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl)-5-methoxyphenol;

[0227] ​0.8 parts of spacer microspheres: 0.1 parts of PS-Fe3O4nanomicrospheres, 0.1 parts of α-cyclodextrin modified SiO2nanomicrospheres, 0.2 parts of silanol group modified ferroferric oxide magnetic nanomicrospheres, 0.2 parts of silica microspheres and 0.2 parts of alumina microspheres, the size of the microspheres is 13 μm;

[0228] At 35°C, under vacuum conditions, a 13 μm thick layer of liquid crystal / ultraviolet polymerizable monomer mixture was uniformly coated on the other side of the second transparent substrate layer by means of scraping (the scraping speed was 7 cm / S -1 ) and after the coating was completed, the conductive surface of the first transparent substrate layer was attached to the surface of the liquid crystal / ultraviolet polymerizable monomer mixture, and a wavelength of 390 nm, a light intensity of 70 mW / cm 2 was used for ultraviolet light irradiation for 25 min to obtain the first polymer composite liquid crystal layer (at this time, the complete writing device was obtained);

[0229] Embodiment 6:

[0230] 1) Preparation of the third polymer composite liquid crystal layer

[0231] The nematic liquid crystal, the optical control agent mixture, the ultraviolet polymerizable monomer mixture, the photoinitiator mixture, the ultraviolet absorber and the spacer microspheres were mixed according to the following weight parts to obtain a uniform and stable liquid crystal / ultraviolet polymerizable monomer mixture;

[0232] The liquid crystal / ultraviolet polymerizable monomer mixture is, for example, as follows:

[0233] 85 parts of nematic liquid crystal;

[0234] 28 parts of optical control agent mixture: 4 parts of (R)-(-)-methyl 3-hydroxyisobutyrate, 4 parts of (R)-(+)-1-phenylethanol, 5 parts of (S)-(-)-1-phenylethanol, 5 parts of (S)-2-chloro-4-methylvaleric acid, 5 parts of R-2-octanol, 5 parts of S-(-)-2-methyl-1-butanol;

[0235] 80 parts of ultraviolet polymerizable monomer mixture: 20 parts of 1,6-hexanediol diacrylate, 20 parts of dipropylene glycol diacrylate, 20 parts of cyclotrimethylolpropane trimethacrylate and 20 parts of pentaerythritol triacrylate;

[0236] 0.5 parts of photoinitiator mixture: 0.1 parts of 1-hydroxycyclohexyl phenyl ketone, 0.1 parts of 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl) butanone, 0.1 parts of 2-methyl-1-(4-methylthiophenyl)-2-morpholinyl-1-propanone, 0.1 parts of 2-isopropylthioxanthone, 0.1 parts of bis(1-(2,4-difluorophenyl)-3-pyrrolyl)titanocene;

[0237] 0.9 parts of ultraviolet absorber: 0.3 parts of 2,4-bis(2,4-dimethylphenyl)-6-(2-hydroxy-4-n-octyloxyphenyl)-1,3,5-triazine, 0.3 parts of 3,5-di-tert-butyl-4-hydroxybenzoic acid-2,4-di-tert-butylphenyl ester and 0.3 parts of 2-(4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl)-5-methoxyphenol;

[0238] 0.9 parts of spacer microspheres: 0.2 parts of PS-Fe3O4nanomicrospheres, 0.2 parts of a-cyclodextrin modified SiO2nanomicrospheres, 0.2 parts of silanol group modified Fe3O4magnetic nanomicrospheres, 0.2 parts of SiO2microspheres and 0.1 parts of Al2O3microspheres, the size of the microspheres is 17 μm;

[0239] Under the condition of 37℃ and vacuum, a 17 μm thick liquid crystal / ultraviolet polymerizable monomer mixture was uniformly coated on the conductive surface of the fourth substrate layer by means of scraping (the scraping speed is 9 cm / S -1 ) and after the coating, the third transparent substrate layer was attached on the surface of the liquid crystal / ultraviolet polymerizable monomer mixture, and a third polymer composite liquid crystal layer was obtained by using ultraviolet light with a wavelength of 398 nm and an illumination intensity of 85 mW / cm 2 for 30 min irradiation.

[0240] 2) Preparation of the second polymer composite liquid crystal layer

[0241] The nematic liquid crystal, the optical control agent mixture, the ultraviolet polymerizable monomer mixture, the photoinitiator mixture, the ultraviolet absorber and the spacer microspheres were mixed according to the following weight parts to obtain a uniform and stable liquid crystal / ultraviolet polymerizable monomer mixture.

[0242] The liquid crystal / ultraviolet polymerizable monomer mixture is, for example, as follows:

[0243] 85 parts of nematic liquid crystal;

[0244] 30 parts of optical control agent mixture: 5 parts of (R)-(-)-methyl 3-hydroxyisobutyrate, 5 parts of (R)-(+)-1-phenylethanol, 5 parts of (S)-(-)-1-phenylethanol, 5 parts of (S)-2-chloro-4-methylvaleric acid, 5 parts of R-2-octanol and 5 parts of S-(-)-2-methyl-1-butanol;

[0245] 80 parts of ultraviolet polymerizable monomer mixture: 20 parts of 1,6-hexanediol diacrylate, 20 parts of dipropylene glycol diacrylate, 20 parts of cyclo-trihydroxymethyl propane trimethyl acrylate and 20 parts of pentaerythritol triacrylate;

[0246] 0.5 parts of a photoinitiator mixture: 0.1 part of 1-hydroxycyclohexyl phenyl ketone, 0.1 part of 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl) butanone, 0.1 part of 2-methyl-1-(4-methylthiophenyl)-2-morpholinyl-1-propanone, 0.1 part of 2-isopropylthioxanthone, 0.1 part of bis(1-(2,4-difluorophenyl)-3-pyrrolyl)titanium;

[0247] 0.9 parts of an ultraviolet absorber: 0.3 parts of 2,4-bis(2,4-dimethylphenyl)-6-(2-hydroxy-4-n-octyloxyphenyl)-1,3,5-triazine, 0.3 parts of 3,5-di-tert-butyl-4-hydroxybenzoic acid-2,4-di-tert-butylphenyl ester, and 0.3 parts of 2-(4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl)-5-methoxyphenol;

[0248] 0.9 parts of a spacer microsphere: 0.2 parts of PS-Fe3O4 nanomicrosphere, 0.2 parts of α-cyclodextrin modified SiO2 nanomicrosphere, 0.2 parts of silanol group modified Fe3O4 magnetic nanomicrosphere, 0.2 parts of silica microsphere, and 0.1 part of alumina microsphere, the microsphere size being 17 μm;

[0249] Under vacuum condition at 37℃, a 17 μm thick liquid crystal / ultraviolet polymerizable monomer mixture was uniformly coated on the other side of the third transparent substrate layer by means of scraping (scraping speed being 9 cm / S -1 ) and after coating, the second transparent substrate layer was attached on the surface of the liquid crystal / ultraviolet polymerizable monomer mixture, and a wavelength of 398 nm, light intensity of 85 mW / cm 2 ) ultraviolet light was used for irradiation for 30 min to obtain the second polymer composite liquid crystal layer;

[0250] 3) Preparation of the first polymer composite liquid crystal layer

[0251] The nematic liquid crystal, optical rotation control agent mixture, ultraviolet polymerizable monomer mixture, photoinitiator mixture, ultraviolet absorber, and spacer microsphere were mixed according to the following weight parts to obtain a uniform and stable liquid crystal / ultraviolet polymerizable monomer mixture;

[0252] The liquid crystal / ultraviolet polymerizable monomer mixture was, for example, as follows:

[0253] 85 parts of nematic liquid crystal;

[0254] 32 parts of optical rotation control agent mixture: 5 parts of (R)-(-)-methyl 3-hydroxyisobutyrate, 5 parts of (R)-(+)-1-phenylethanol, 5 parts of (S)-(-)-1-phenylethanol, 5 parts of (S)-2-chloro-4-methylpentanoic acid, 6 parts of R-2-octanol, and 6 parts of S-(-)-2-methyl-1-butanol;

[0255] 80 parts of UV polymerizable monomer mixture: 20 parts of 1,6-hexanediol diacrylate, 20 parts of dipropylene glycol diacrylate, 20 parts of cyclotrimethylolpropane trimethacrylate and 20 parts of pentaerythritol triacrylate;

[0256] 0.5 parts of photoinitiator mixture: 0.1 part of 1-hydroxycyclohexyl phenyl ketone, 0.1 part of 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl) butanone, 0.1 part of 2-methyl-1-(4-methylthiophenyl)-2-morpholinyl-1-propanone, 0.1 part of 2-isopropylthioxanthone, 0.1 part of bis(1-(2,4-difluorophenyl)-3-pyrrolyl)titanium;

[0257] 0.9 parts of UV absorber: 0.3 parts of 2,4-bis(2,4-dimethylphenyl)-6-(2-hydroxy-4-n-octyloxyphenyl)-1,3,5-triazine, 0.3 parts of 3,5-di-tert-butyl-4-hydroxybenzoic acid-2,4-di-tert-butylphenyl ester and 0.3 parts of 2-(4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl)-5-methoxyphenol;

[0258] 0.9 parts of spacer microspheres: 0.1 part of PS-Fe3O4 nanometer microspheres, 0.2 part of α-cyclodextrin modified SiO2 nanometer microspheres, 0.2 part of silanol group modified Fe3O4 magnetic nanometer microspheres, 0.2 part of silica microspheres and 0.2 part of alumina microspheres, the size of the microspheres is 17 μm;

[0259] Under the condition of vacuum, the liquid crystal / UV polymerizable monomer mixture is uniformly coated on the other side of the second transparent substrate layer in the form of scraping (the scraping speed is 9 cm / S -1 ) at 37℃, after the coating is completed, the conductive surface of the first transparent substrate layer is attached on the surface of the liquid crystal / UV polymerizable monomer mixture, and the first polymer composite liquid crystal layer is obtained by using the UV light with the wavelength of 398 nm and the light intensity of 85 mW / cm 2 for 30 min (at this time, the complete writing device is obtained);

[0260] Embodiment 7:

[0261] 1) Preparation of the third polymer composite liquid crystal layer

[0262] The nematic liquid crystal, the optical rotation control agent mixture, the UV polymerizable monomer mixture, the photoinitiator mixture, the UV absorber and the spacer microspheres are mixed according to the following weight parts to obtain the uniform and stable liquid crystal / UV polymerizable monomer mixture;

[0263] The liquid crystal / UV polymerizable monomer mixture is as follows:

[0264] 90 parts of nematic liquid crystal;

[0265] 35 parts of optical rotation control agent mixture: 5 parts of (R)-(-)-methyl 3-hydroxyisobutyrate, 5 parts of (R)-(+)-1-phenylethanol, 5 parts of (S)-(-)-1-phenylethanol, 5 parts of (S)-2-chloro-4-methylvaleric acid, 5 parts of R-2-octanol, 10 parts of S-(-)-2-methyl-1-butanol;

[0266] 90 parts of UV polymerizable monomer mixture: 30 parts of 1,6-hexanediol diacrylate, 20 parts of dipropylene glycol diacrylate, 20 parts of cyclotrimethylolpropane trimethacrylate, and 20 parts of pentaerythritol triacrylate;

[0267] 0.1 parts of photoinitiator mixture: 0.02 parts of 1-hydroxycyclohexyl phenyl ketone, 0.02 parts of 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl) butanone, 0.02 parts of 2-methyl-1-(4-methylthiophenyl)-2-morpholinyl-1-propanone, 0.02 parts of 2-isopropylthioxanthone, 0.02 parts of bis(1-(2,4-difluorophenyl)-3-pyrrolyl)titanocene;

[0268] 1 part of UV absorber: 0.3 parts of 2,4-bis(2,4-dimethylphenyl)-6-(2-hydroxy-4-n-octyloxyphenyl)-1,3,5-triazine, 0.3 parts of 3,5-di-tert-butyl-4-hydroxybenzoic acid-2,4-di-tert-butylphenyl ester, and 0.4 parts of 2-(4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl)-5-methoxyphenol;

[0269] 1 part of spacer microspheres: 0.2 parts of PS-Fe3O4 nanometer microspheres, 0.2 parts of α-cyclodextrin modified SiO2 nanometer microspheres, 0.2 parts of silanol group modified Fe3O4 magnetic nanometer microspheres, 0.2 parts of silica microspheres, and 0.2 parts of alumina microspheres, the size of the microspheres is 20 μm;

[0270] Under the condition of vacuum at 40℃, a 20 μm thick layer of liquid crystal / UV polymerizable monomer mixture was uniformly coated on the conductive surface of the fourth substrate layer by means of scraping (the scraping speed was 10 cm / S -1 ) and after the coating was completed, the third transparent substrate layer was attached to the surface of the liquid crystal / UV polymerizable monomer mixture, and a wavelength of 400 nm, light intensity of 100 mW / cm 2 was used for irradiation for 35 min, and a third polymer composite liquid crystal layer was obtained;

[0271] 2) Preparation of the second polymer composite liquid crystal layer

[0272] A nematic liquid crystal, an optical rotation control agent mixture, an ultraviolet polymerizable monomer mixture, a photoinitiator mixture, an ultraviolet absorber, and a spacer microsphere were mixed in the following weight parts to obtain a uniform and stable liquid crystal / ultraviolet polymerizable monomer mixture:

[0273] The liquid crystal / ultraviolet polymerizable monomer mixture was as follows:

[0274] 90 parts of a nematic liquid crystal;

[0275] 30 parts of an optical rotation control agent mixture: 5 parts of (R)-(-)-methyl 3-hydroxyisobutyrate, 5 parts of (R)-(+)-1-phenylethanol, 5 parts of (S)-(-)-1-phenylethanol, 5 parts of (S)-2-chloro-4-methylvaleric acid, 5 parts of R-2-octanol, and 5 parts of S-(-)-2-methyl-1-butanol;

[0276] 90 parts of an ultraviolet polymerizable monomer mixture: 30 parts of 1,6-hexanediol diacrylate, 20 parts of dipropylene glycol diacrylate, 20 parts of cyclo-trihydroxymethylpropane trimethacrylate, and 20 parts of pentaerythritol triacrylate;

[0277] 0.1 parts of a photoinitiator mixture: 0.02 parts of 1-hydroxycyclohexyl phenyl ketone, 0.02 parts of 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl) butanone, 0.02 parts of 2-methyl-1-(4-methylthiophenyl)-2-morpholinyl-1-propanone, 0.02 parts of 2-isopropylthioxanthone, and 0.02 parts of bis(1-(2,4-difluorophenyl)-3-pyrrolyl) titanium;

[0278] 1 part of an ultraviolet absorber: 0.3 parts of 2,4-bis(2,4-dimethylphenyl)-6-(2-hydroxy-4-n-octyloxyphenyl)-1,3,5-triazine, 0.3 parts of 3,5-di-tert-butyl-4-hydroxybenzoic acid-2,4-di-tert-butylphenyl ester, and 0.4 parts of 2-(4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl)-5-methoxyphenol;

[0279] 1 part of a spacer microsphere: 0.2 parts of PS-Fe3O4 nanomicrosphere, 0.2 parts of α-cyclodextrin modified SiO2 nanomicrosphere, 0.2 parts of silanol group modified Fe3O4 magnetic nanomicrosphere, 0.2 parts of SiO2 microsphere, and 0.2 parts of Al2O3 microsphere, and the microsphere size was 20 μm;

[0280] The liquid crystal / ultraviolet polymerizable monomer mixture was coated on a glass substrate at 40°C under vacuum conditions by using a doctor blade (the coating speed was 10 cm / s -1) in the same manner, a 20 μm-thick liquid crystal / UV-polymerizable monomer mixture was uniformly coated on the other side of the third transparent substrate layer, after the coating was completed, the second transparent substrate layer was attached to the surface of the liquid crystal / UV-polymerizable monomer mixture, and the second polymer composite liquid crystal layer was obtained by irradiation with UV light having a wavelength of 400 nm and an illumination intensity of 100 mW / cm 2 for 35 min.

[0281] 3) Preparation of the first polymer composite liquid crystal layer

[0282] The nematic liquid crystal, the optical rotation control agent mixture, the UV-polymerizable monomer mixture, the photoinitiator mixture, the UV absorber, and the spacer microspheres were mixed in the following weight proportions to obtain a uniform and stable liquid crystal / UV-polymerizable monomer mixture.

[0283] The liquid crystal / UV-polymerizable monomer mixture had the following proportions:

[0284] 90 parts of nematic liquid crystal;

[0285] 24 parts of optical rotation control agent mixture: 4 parts of (R)-(-)-methyl 3-hydroxyisobutyrate, 4 parts of (R)-(+)-1-phenylethanol, 4 parts of (S)-(-)-1-phenylethanol, 4 parts of (S)-2-chloro-4-methylvaleric acid, 4 parts of R-2-octanol, and 4 parts of S-(-)-2-methyl-1-butanol;

[0286] 90 parts of UV-polymerizable monomer mixture: 30 parts of 1,6-hexanediol diacrylate, 20 parts of dipropylene glycol diacrylate, 20 parts of cyclo-trihydroxymethylpropane trimethacrylate, and 20 parts of pentaerythritol triacrylate;

[0287] 0.1 parts of photoinitiator mixture: 0.02 parts of 1-hydroxycyclohexyl phenyl ketone, 0.02 parts of 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl) butanone, 0.02 parts of 2-methyl-1-(4-methylthiophenyl)-2-morpholinyl-1-propanone, 0.02 parts of 2-isopropylthioxanthone, and 0.02 parts of bis(1-(2,4-difluorophenyl)-3-pyrrolyl) titanium;

[0288] 1 part of UV absorber: 0.3 parts of 2,4-bis(2,4-dimethylphenyl)-6-(2-hydroxy-4-n-octyloxyphenyl)-1,3,5-triazine, 0.3 parts of 3,5-di-tert-butyl-4-hydroxybenzoic acid-2,4-di-tert-butylphenyl ester, and 0.4 parts of 2-(4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl)-5-methoxyphenol;

[0289] 1 spacer microspheres: 0.2 PS-Fe3O4 nanospheres, 0.2 α-cyclodextrin modified SiO2 nanospheres, 0.2 silanol group modified ferroferric oxide magnetic nanospheres, 0.2 silica microspheres and 0.2 alumina microspheres, the microsphere size is 20 μm;

[0290] At 40°C, under vacuum conditions, using the way of scraping (scraping speed is 10 cm / S -1 ) to uniformly coat a layer of 20 μm thick liquid crystal / UV polymerizable monomer mixture on the other side of the second transparent substrate layer, after coating, the conductive surface of the first transparent substrate layer is attached on the surface of the liquid crystal / UV polymerizable monomer mixture, using the UV light with wavelength of 400 nm and light intensity of 100 mW / cm 2 for 35 min, to obtain the first polymer composite liquid crystal layer (at this time, the complete writing device is obtained).

[0291] The test parameters of the liquid crystal writing device obtained by the above various embodiments are as follows:

[0292]

[0293] The results show that the test parameters of the liquid crystal writing device obtained by various embodiments can meet the performance requirements and use requirements of the product.

[0294] The above describes the specific embodiments of the present application in combination with the drawings, but is not a limitation on the protection scope of the present application, and those skilled in the art should understand that various modifications or changes made by those skilled in the art on the basis of the technical solutions of the present application without creative labor are still within the protection scope of the present application.

Claims

1. A multi-color liquid crystal writing device, characterized by comprising: It comprises: The first transparent substrate layer, the first conductive layer, the first polymer composite liquid crystal layer, the second transparent substrate layer, the second polymer composite liquid crystal layer, the third transparent substrate layer, the third polymer composite liquid crystal layer, the second conductive layer and the fourth substrate layer are sequentially arranged; the second transparent substrate layer and the third transparent substrate layer are PET transparent films, the film thickness is 1-20μm, and the light transmittance is 90-98%; the second transparent substrate layer and the third transparent substrate layer are not plated with a conductive layer; The first polymer composite liquid crystal layer, the second polymer composite liquid crystal layer and the third polymer composite liquid crystal layer are uniformly distributed on the corresponding conductive layer or transparent substrate layer by means of scraping coating respectively; Different optical control agents are added to the first polymer composite liquid crystal layer, the second polymer composite liquid crystal layer and the third polymer composite liquid crystal layer respectively to reflect different colors; the first transparent substrate layer and the fourth substrate layer are doped with nano color adjuster and contrast adjuster, the nano color adjuster includes 0.8-5 parts of aluminum nanorod, 0.8-5 parts of aluminum chloride nanoparticles and 0.8-5 parts of nano alumina particles, so that the color reflected by the liquid crystal is brighter and more brilliant, and the contrast adjuster includes 0.8-5 parts of nano chromium, 0.8-5 parts of copper sulfide nanoparticles and 0.8-5 parts of titanium dioxide nanoparticles to improve the contrast; The raw material composition of the first polymer composite liquid crystal layer or the second polymer composite liquid crystal layer or the third polymer composite liquid crystal layer includes, by weight fraction: 50-90 parts of nematic liquid crystal, 1-35 parts of optical control agent mixture, 15-90 parts of ultraviolet polymerizable monomer mixture, 0.1-15 parts of photoinitiator mixture, 0.01-1 parts of ultraviolet absorber, and 0.05-1 parts of spacer microspheres; The raw material composition of the optical control agent mixture includes, by weight fraction: 0-6 parts of (R)-(-)-methyl 3-hydroxyisobutyrate, 0-8 parts of (R)-(+)-1-phenylethanol, 0-20 parts of (S)-(-)-1-phenylethanol, 0-6 parts of (S)-2-chloro-4-methylvaleric acid, 0-8 parts of R-2-octanol, and 0-20 parts of S-(-)-2-methyl-1-butanol, each component is not 0 at the same time.

2. A multi-color liquid crystal writing device as claimed in claim 1, characterized in that The first transparent substrate layer is a PET transparent film, the film is 10-80μm, and the light transmittance is 90-97%, the PET transparent film is also doped with an electrically insulating adjuster, and the electrically insulating adjuster includes: 2-10 parts of nano kaolin, 2-10 parts of nano alumina and 2-10 parts of nano boron carbide, to adjust the electrically insulating property of the PET transparent film.

3. A multi-color liquid crystal writing device as claimed in claim 1, characterized in that The raw material composition of the ultraviolet polymerizable monomer mixture includes, by weight fraction: 0-30 parts of 1,6-hexanediol diacrylate, 0-20 parts of dipropylene glycol diacrylate, 0-20 parts of cyclo-trihydroxymethyl propane trimethyl acrylate, and 0-20 parts of pentaerythritol triacrylate, each component is not 0 at the same time.

4. A multi-color liquid crystal writing device as claimed in claim 1, characterized in that The raw material composition of the ultraviolet absorber includes, by weight fraction: 0-0.5 parts of 2,4-bis(2,4-dimethylphenyl)-6-(2-hydroxy-4-n-octyloxyphenyl)-1,3,5-triazine, 0-0.5 parts of 3,5-di-tert-butyl-4-hydroxybenzoic acid-2,4-di-tert-butylphenyl ester, and 0-0.5 parts of 2-(4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl)-5-methoxyphenol, and each component is not 0 at the same time.

5. A multi-color liquid crystal writing device as claimed in claim 1, wherein The second transparent substrate layer is a PET transparent film; the PET transparent film is doped with a nano colorant and a contrast adjuster; the nano colorant includes 0.8-5 parts of aluminum nanorods and 0.8-5 parts of nano aluminum oxide particles; and the contrast adjuster includes 0.8-5 parts of nano chromium and 0.8-5 parts of titanium dioxide nanoparticles.

6. A multi-color liquid crystal writing device as claimed in claim 1, characterized in that The third transparent substrate layer is a PET transparent film; the PET transparent film is doped with a nano colorant and a contrast adjuster; the nano colorant includes 0.8-5 parts of aluminum nanorods, 0.8-5 parts of aluminum chloride nanoparticles, and 0.8-5 parts of aluminum oxide nanoparticles; and the contrast adjuster includes 0.8-5 parts of nano chromium, 0.8-5 parts of copper sulfide nanoparticles, and 0.8-5 parts of titanium dioxide nanoparticles.

7. A multi-color liquid crystal writing device as claimed in claim 1, wherein The fourth substrate layer is a PET transparent film, the film is 10-80 μm, and the light transmittance is 90-98% or opaque black; the PET transparent film is also doped with an electrical insulation adjuster, which includes: 0-10 parts of nano kaolin, 0-10 parts of nano aluminum oxide, and 0-10 parts of nano boron carbide, to adjust the electrical insulation of the PET transparent film.

8. A method for preparing a multi-color liquid crystal writing device according to claim 1, characterized by, It includes: 1) Preparation of liquid crystal / ultraviolet polymerizable monomer mixture The nematic liquid crystal, optical control agent, ultraviolet polymerizable monomer, photoinitiator, ultraviolet absorber, and spacer microspheres are mixed according to the set weight fraction to obtain three kinds of uniform and stable liquid crystal / ultraviolet polymerizable monomer mixtures with different proportions; The raw material composition of the first, second, and third polymer composite liquid crystal layers, by weight fraction, includes: 50-90 parts of nematic liquid crystal, 1-35 parts of optical control agent mixture, 15-90 parts of ultraviolet polymerizable monomer mixture, 0.1-15 parts of photoinitiator mixture, 0.01-1 parts of ultraviolet absorber, and 0.05-1 parts of spacer microspheres; The raw material composition of the optical control agent mixture, by weight fraction, includes: 0-6 parts of (R)-(-)-methyl 3-hydroxyisobutyrate, 0-8 parts of (R)-(+)-1-phenylethanol, 0-20 parts of (S)-(-)-1-phenylethanol, 0-6 parts of (S)-2-chloro-4-methylvaleric acid, 0-8 parts of R-2-octanol, and 0-20 parts of S-(-)-2-methyl-1-butanol, and each component is not 0 at the same time. 2) Preparation of the third polymer composite liquid crystal layer A layer of liquid crystal / UV-polymerizable monomer mixture with a thickness of 1-20 μm is uniformly coated on the conductive surface of the fourth substrate layer by scraping at 25-40 °C under vacuum, after the coating is completed, the third transparent substrate layer is attached on the surface of the liquid crystal / UV-polymerizable monomer mixture, and the third polymer composite liquid crystal layer is obtained by irradiating with UV light with a wavelength of 360-400 nm and an illumination intensity of 1-100 mW / cm 2 for 5-35 min. 3) Preparation of the second polymer composite liquid crystal layer Under vacuum condition at 25-40℃, a 1-20μm thick liquid crystal / UV polymerizable monomer mixture layer is coated on the other side of the third transparent substrate layer by means of scraping, after coating, the second transparent substrate layer is attached on the surface of the liquid crystal / UV polymerizable monomer mixture, and then the second polymer composite liquid crystal layer is obtained by irradiation with UV light of wavelength 360-400nm and light intensity 1-100mW / cm 2 for 5-35min. 4) Preparation of the first polymer composite liquid crystal layer A 1-20 μm thick liquid crystal / UV polymerizable monomer mixture is uniformly coated on the other side of the second transparent substrate layer by means of scraping under vacuum at 25-40°C, after the coating, the conductive surface of the first transparent substrate layer is attached to the surface of the liquid crystal / UV polymerizable monomer mixture, and the first polymer composite liquid crystal layer is obtained by irradiation with UV light with a wavelength of 360-400 nm and an illumination intensity of 1-100 mW / cm 2 for 5-35 min. The liquid crystal / ultraviolet polymerizable monomer mixture coated in each polymer composite liquid crystal layer is different in composition, and the optical rotation control agent in the liquid crystal / ultraviolet polymerizable monomer mixture coated in each polymer composite liquid crystal layer is different in component and content. The drawdown speed is 0.5-10 cm / s -1 .

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