WO2021119969A1 - Suspended particle light valve having protection layer - Google Patents

Abstract

A light valve comprises: a first transparent electrode (22); a second transparent electrode (22); and a suspended particle-containing light control layer (1) provided between the first transparent electrode (22) and the second transparent electrode (22), wherein a first protection layer (3) is provided between the first transparent electrode (22) and the light control layer (1), and/or a second protection layer (3) is provided between the second transparent electrode (22) and the light control layer (1).

Description

Suspended particle light valve with protective layer Technical field

The invention relates to a suspended particle light valve. More specifically, it relates to a suspended particle light valve whose protective layer has a single-layer structure or a multi-layer structure.

Background technique

Technically speaking, a light valve is a device that can adjust the amount of light passing through a medium, similar to a water valve that can control the flow of water. Curtains can be seen as a kind of light valve. In the present invention, the light valve is a device that can electronically control the light transmittance, and this device is scientifically called an electrochromic device. Depending on the principle of the electrochromic device, it can be further classified into a liquid crystal color changing light valve, an electrochemical color changing light valve and a suspended particle light valve.

Among them, the suspended particle light valve, whose electroactive component is light-controlling particles that can be rearranged in an electromagnetic field applied through two transparent electrodes.

A typical suspended particle light valve is shown in Figure 1. It includes a light control layer 1 sandwiched between two transparent electrodes 2. The transparent electrode 2 is composed of a transparent substrate 21 and a transparent conductive film 22 thereon. The light control layer 1 is usually obtained by dispersing a suspension medium 12 containing light control particles 11 into a polymer matrix 13, wherein the light control particles 11 can be rearranged under the action of an electric field. More specifically, in this type of light valve, the light control particles 11 absorb, scatter or reflect light through Brownian motion in a state where no electric field is applied, so incident light cannot penetrate the light valve. When an electric field is applied, because the light control particles 11 have an electric dipole moment, the light control particles 11 are arranged in a direction parallel to the electric field. At this time, the light incident on the light valve can penetrate the light valve. In this, the amount of transmitted light is adjusted by the response of the light control particles 11 to the electric field.

In practical applications, the light control layer of the suspended particle light valve made in this way is relatively fragile, and it is easy to wear and break under bending, pressure, friction, etc., and damage will cause the transparent electrodes to contact each other and short-circuit, resulting in irreversible light. The valve is damaged. In addition, the chemical properties of the light control layer and its direct adhesion to the transparent electrode are very low, which leads to problems such as inability to smoothly wind up in the industrial production process. At the same time, suspended particles are nanoparticles, which are very sensitive to humidity, transparent conductive film 22, ultraviolet rays, etc., and require strict protection; therefore, a better technology needs to be invented to effectively improve the stability of the suspended particle light valve. Reduce the damage of external factors to the light valve.

Summary of the invention

In view of the above problems, the present invention provides a suspended particle light valve with a protective layer, including a first transparent electrode, a second transparent electrode, and a suspended particle light control layer arranged between the first transparent electrode and the second transparent electrode, among them:

A first protective layer is provided between the first transparent electrode and the light control layer; and/or

A second protective layer is arranged between the second transparent electrode and the light control layer.

Preferably, the first protective layer and the second protective layer have a single-layer or multi-layer structure.

Preferably, the material of any sublayer in the single-layer or multi-layer structure includes one of epoxy resin, polyurethane, polyimide resin, polystyrene resin, acrylic resin, modified acrylic, and silica gel.

Preferably, in the protective layer of the single-layer or multi-layer structure, the material of the sub-layer adjacent to the suspended particle light control layer includes one of the main components of acrylate, modified acrylic, and silica gel.

Preferably, the thickness of the first protective layer and/or the second protective layer is 0.5-10 microns.

Preferably, the thickness of the first protective layer and/or the second protective layer is 0.8-5 microns.

Preferably, the thickness of the first protective layer and/or the second protective layer is 1 to 3 microns.

Preferably, wherein the single-layer or multi-layer structure is 1 layer or 2 layers or 3 layers.

Preferably, the thickness of each sub-layer in the single-layer or multi-layer structure is 0.5-10 microns.

Preferably, the thickness of each sub-layer in the single-layer or multi-layer structure is 0.6-5 microns.

Preferably, the thickness of each sub-layer in the single-layer or multi-layer structure is 0.8-2 microns.

Preferably, the first protective layer and the second protective layer are formed as follows: the protective layer polymer precursor RP is respectively coated on the conductive sides of the first transparent electrode and the second transparent electrode to form a glue protective layer; The glue protective layer on the first transparent electrode and the second transparent electrode are respectively irradiated with ultraviolet UV or thermally cured to form the protective layer on the first transparent electrode and the protective layer on the second electrode.

Preferably, the light control layer is formed by coating a light valve matrix emulsion containing polymer precursor PPM, suspension medium SM, light control particles LCP and photoinitiator PI on the protective layer side of the transparent electrode containing the protective layer. Valve matrix emulsion layer.

Preferably, the thickness of the light valve matrix emulsion layer is 10-100 microns.

Preferably, the length of the light control particle LCP is in the range of 100-500 nm, and the diameter thereof is 20-100 nm.

Preferably, the composition of the light control particle LCP _{is at least one of titanium dioxide (TiO 2} ), polyhalides and chloroapatite.

Preferably, the mass amount of the photoinitiator accounts for 0.1%-1% of the light valve matrix emulsion.

Preferably, the photoinitiator is selected from at least one of 184, ITX, 819, 1173, BDK, BP, TPO, 369, and 907.

Preferably, the light valve matrix emulsion further includes a stabilizer and/or emulsifier.

The method for adding a protective layer to the suspended particle light valve of the present invention has a simple structure and obvious effects, and has the following advantages:

The first advantage is that it can prevent the entire light valve device from being short-circuited and damaged due to a small amount of flaws in the light valve causing the transparent electrode to contact, thereby improving the product qualification rate.

Advantage two, because the protective layer material is a high-viscosity material and has similar chemical properties to the light control layer, the protective layer can bond the transparent electrode and the light control layer more firmly, thereby making the light valve device more difficult to break, abrasion resistance, and bending resistance The physical properties such as folding are improved.

Advantage 3: The protective layer is a transparent material with a dense structure, good hydrophobicity, and low dielectric constant, which can effectively prevent moisture and oxygen from penetrating into the light control layer, effectively protect the light control particles, and increase the service life of the light valve.

Advantage four, since the protective layer effectively blocks the contact between the transparent electrode and the light control layer, it blocks the catalytic decomposition of the metal oxide layer, that is, the transparent conductive film 22', on the light control layer, thereby increasing the service life of the light valve.

Advantage five, the multi-layer structure of the protective layer avoids the limitations of the single-layer material, and through synergy, greatly improves the service life of the suspended particle light valve.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

Figure 1. A schematic diagram of the structure of a suspended particle light valve in the prior art;

FIG. 2. The structure diagram of the protective layer on the transparent conductive film 22 of the transparent electrode 2 in the present invention;

Figure 3. A schematic diagram of the suspension particle light valve matrix emulsion applied to the protective layer side of the transparent electrode containing a protective layer in the present invention to form a suspended particle light valve matrix emulsion layer;

Figure 4 is a schematic diagram of the structure of the suspended particle light valve containing a protective layer in the present invention.

Detailed ways

The following describes the technical solutions in the embodiments of the present invention clearly and completely with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

As shown in FIG. 2, according to an embodiment of the present invention, the preparation method of the protective layer is as follows. The glue is applied to the transparent conductive film 22 of the transparent electrode to form the protective glue layer 3a, which is cured by ultraviolet UV radiation or thermal curing. The protective layer 3a is formed, and another glue solution is applied to the protective layer 3a to form a protective glue layer 3b. The protective layer 3b is formed by ultraviolet UV radiation or thermal curing. The protective layers 3a, 3b are collectively referred to as the protective layer 3.

In the above embodiment, the protective layer includes the protective layer 3a and the protective layer 3b, which is a two-layer structure protective layer. Among them, the main function of 3a sublayer is barrier function, and the main function of 3b sublayer is viscosity function. In other embodiments, the protective layer may be a single layer or a three-layer or more layer structure. The barrier effect and viscosity effect represent the main functions that the material of the layer can achieve, and the barrier sublayer can achieve better water barrier, oxygen barrier, barrier organic solvent penetration, and isolation of the metal oxide layer (ie the transparent conductive film 22' ); The adhesive sub-layer can achieve better adhesion to the light control layer. The material used in each sublayer here is not a single function. Each material has its own advantages and disadvantages in terms of water resistance, oxygen resistance, organic solvent penetration, and adhesion. Although a single material can achieve multiple functions, Multiple sub-layers can play a better synergy. The main components of the barrier sublayer include epoxy resins, polyurethanes, polyimide resins, polystyrene resins, and modified acrylic. The main components of the adhesive sublayer include acrylates, modified acrylics, and silica gels. one of a kind. The above materials are only examples. The materials used in the barrier sub-layer and the adhesive sub-layer include but are not limited to the above materials. Other materials that can achieve similar functions can be used.

As shown in Figure 3, the preparation method of the protective layer suspended particle light valve is to apply the suspended particle light valve matrix emulsion containing the polymer precursor PPM, the suspension medium SM, the light control particle LCP and the photoinitiator PI to the transparent electrode containing the protective layer A suspended particle light valve matrix emulsion layer is formed on the protective layer, and the suspended particle light valve matrix emulsion layer is cured by ultraviolet UV radiation to form a light control layer; finally, as shown in Figure 4, the part of the transparent electrode and the light control layer containing the protective layer is combined with Another transparent electrode containing a protective layer is pressed together to obtain a complete suspended particle light valve containing a protective layer.

The thickness of the protective layer is 0.5-10 micrometers, preferably 0.8-5 micrometers, more preferably 1-3 micrometers, and the thickness of the light valve matrix emulsion layer is 10-100 micrometers. The thickness of each of the "sublayers" included in the protective layer is 0.5-10 microns, more preferably 0.6-5 microns, and most preferably 0.8-2 microns.

Compared with the existing light valve, this light valve containing suspended particles with a protective layer can prevent the entire light valve device from being short-circuited and damaged due to a small amount of defects in the light valve causing the transparent electrode to contact. At the same time, because the protective layer material is a high-viscosity material and has similar chemical properties to the light control layer, the protective layer can bond the transparent electrode and the light control layer more firmly, making the light valve device more difficult to break, more resistant to friction, and resistant to bending The physical performance is greatly improved.

At the same time, the protective layer material is a good hydrophobic, dense, low-dielectric constant transparent material, which can effectively prevent moisture and oxygen from penetrating into the light control layer, and effectively protect the light control particles LCP. In addition, because the protective layer effectively blocks the contact between the transparent electrode and the light control layer, and isolates the metal oxide layer, that is, the transparent conductive film 22', from the catalytic decomposition of the light control layer, thereby increasing the service life of the light valve.

The protective layer is composed of at least one of an epoxy resin layer, an acrylic resin layer, a polyurethane layer, a polyimide resin layer, a polystyrene resin layer, a modified acrylic layer, and a silica gel layer.

The following methods were used to evaluate the adhesion and stability of the light valve containing suspended particles in the protective layer.

Method to evaluate the adhesion of suspended particle light valve:

Adhesion reflects the stability of the structure of the suspended particle light valve against physical external forces. The adhesion force is measured by the adhesion force measuring instrument STROGRAPH ES (Toyo Seiki Seisakusho Ltd). The test method is that the light control layer is slowly peeled off the transparent electrode with a vertical 90° tension, where the load is 50N, the pull rate is 50mm/min, and the value is recorded. It is the size of adhesion.

Method for evaluating the stability of suspended particle light valve

Stability reflects the change of light transmittance of the light valve under long-term high humidity, high temperature and strong light and the change of its own appearance color. The test method is to store the light valve in ^{an environmental box with a 500W/m 2} xenon lamp, an air temperature of 55 degrees Celsius, a light valve surface temperature of 60 degrees Celsius, and an ambient humidity of 50%. Compare different light valves for 100 hours. After 500 hours, the light valve is transparent. The light rate changes to compare stability.

In the present invention, the polymer precursor PPM can be a silicon-containing UV optical glue (such as Dow Corning VE-6001, etc.).

The suspension medium SM 12 can be fluorocarbon organic compounds, plasticizers (dioctyl phthalate, dibutyl phthalate, dioctyl phthalate and triisodecyl trimellitate, Dioctyl terephthalate, etc.), dodecylbenzene, polybutene oil, etc.

The light control particles LCP 11 can be nanorods with a length of 0.1 to 1.0 microns, such as metal oxides, polyhalides, and chloroapatite.

The photoinitiator is selected from at least one of 184, ITX, 819, 1173, BDK, BP, TPO, 369, and 907.

The transparent electrode 2'can be ITO conductive glass, ITO/PET conductive film, nano Ag wire/PET conductive film, nano Cu wire/PET conductive film, etc.

[Example 1] Preparation of transparent electrode with protective layer

The epoxy resin glue Permabond ET515A was coated on the ITO/PET transparent conductive film with a doctor blade type automatic film coating machine (MSK-AFA-III type, MTI Corporation), with a thickness of 1 micron. Put it in a vacuum oven at 100 degrees and heat it for 1 hour to obtain ITO/PET coated with epoxy resin layer. Coat the carboxymethyl acrylate light-curing adhesive purchased from sigma-aldrich on the epoxy resin layer with a doctor blade type automatic film coater (MSK-AFA-III type, MTI Corporation), with a thickness of 1 micron, using Aventk The X200-150 UV curing machine produced by the company is cured, the power is adjusted to 700W/m ² , and the curing time is 5s to obtain a transparent electrode with a protective layer.

[Example 2] Preparation of transparent electrode with protective layer

Same as [Example 1], except that the polyurethane glue Permabond's TA439 is used instead of epoxy glue.

[Example 3] Preparation of transparent electrode with protective layer

Same as [Example 1], except that sigma-aldrich purchased propylene glycol diacrylate light-curing adhesive TA439 instead of carboxymethacrylate light-curing adhesive, with a thickness of 0.5 microns.

[Example 4] Preparation of transparent electrode with protective layer

Same as [Example 1], except that modified acrylic light-curing adhesive Permabond's TA436 is used instead of epoxy resin, and cured with X200-150 UV curing machine produced by Aventk, the power is adjusted to 700W/m ² , and the curing time is 5s.

[Example 5] Preparation of transparent electrode with protective layer

Same as [Example 1], except that the thickness is 5 microns.

[Example 6] Preparation of transparent electrode with protective layer

Coat the carboxymethyl acrylate photocurable adhesive purchased by sigma-aldrich on the ITO/PET transparent conductive film with a doctor blade type automatic film coating machine (MSK-AFA-III type, MTI Corporation), with a thickness of 0.5 microns, The X200-150 ultraviolet curing machine produced by Aventk was used for curing, the power was adjusted to 700W/m ² , and the curing time was 5s to obtain a transparent electrode with a protective layer.

[Example 7] Preparation of transparent electrode with protective layer

The epoxy resin glue Permabond ET515A was coated on the ITO/PET transparent conductive film with a doctor blade type automatic film coating machine (MSK-AFA-III type, MTI Corporation), with a thickness of 2 microns. Put it in a vacuum oven at 100 degrees and heat it for 1 hour to obtain ITO/PET coated with epoxy resin layer. Coat the carboxymethyl acrylate light-curing adhesive purchased from sigma-aldrich on the epoxy resin layer with a doctor blade type automatic film coater (MSK-AFA-III type, MTI Corporation), with a thickness of 1 micron, using Aventk The X200-150 UV curing machine produced by the company is cured, the power is adjusted to 700W/m ² , the curing time is 5s, and the modified acrylic light-curing adhesive Permabond's TA436 is used with a scraper type automatic film coating machine (MSK-AFA- Type III, MTI Corporation) is coated on the carboxymethyl acrylate layer with a thickness of 1 micron. It is cured with X200-150 UV curing machine produced by Aventk. The power is adjusted to 700W/m ² and the curing time is 5s to obtain a protective layer. Of transparent electrodes.

[Example 8] Preparation of suspended particle light valve with protective layer

P25，并加热至42℃。等I2溶解后，将6克无水甲醇，0.8克蒸馏水和4克2,5-PDA·2H2O(2,5-吡嗪二甲酸二水合物)加入到三颈圆底玻璃烧瓶中。在42℃下加热搅拌反应4小时，然后自然冷却。将反应溶液在1350G下离心0.5小时以除去大颗粒产物。再将上清液在18000G下离心5小时，弃去上清液，得到光控粒子11。 The light control particle LCP 11 was prepared. Into a 250 ml three-neck round-bottom glass flask was added 30 g of isoamyl acetate solution containing 21.2wt% nitrocellulose (SS 1/4sec), 6 g of I2, 70 g of isoamyl acetate, 4 g of anhydrous CaI2 and 4 grams

P25, and heat to 42°C. After I2 was dissolved, 6 grams of anhydrous methanol, 0.8 grams of distilled water and 4 grams of 2,5-PDA·2H2O (2,5-pyrazine dicarboxylic acid dihydrate) were added to a three-necked round bottom glass flask. The reaction was heated and stirred at 42°C for 4 hours, and then cooled naturally. The reaction solution was centrifuged at 1350G for 0.5 hours to remove large particulate products. The supernatant was centrifuged at 18000G for 5 hours, the supernatant was discarded, and the light control particles 11 were obtained.

The suspension medium SM 12 is dioctyl terephthalate.

Prepare the polymeric precursor PPM. Dissolve 2.7 g of trisilyl hydroxyethyl POSS in 190 ml of heptane to prepare a POSS solution. Add 54 g of hydroxyl-terminated dimethyl diphenyl polysiloxane and 190 ml of POSS solution to a 500 ml three-necked bottle. One side of the three-necked flask is connected with a water separator to the condenser, mechanical stirring is added in the middle, and a thermometer is placed on the other side. The solution in the bottle was heated to reflux for 30 minutes. When a small amount of water appeared in the water trap, the catalyst stannous octoate solution (0.13 g dissolved in 10 ml of heptane) was added. Then a mixture of 3 grams of hydrolyzed acryloxypropyltrimethoxysilane and 1.8 grams of hydrolyzed glycidyltrimethicone was added dropwise for about 5 minutes. The condensation reaction takes about 5 hours, and immediately after that, 30 ml of trimethylmethoxysilane is added as a reaction terminator. The reaction was terminated for 2 hours, and then rapidly cooled to room temperature. Mix 50 ml of ethanol and the cooled reaction solution in a 1 liter beaker, then wash the reaction flask with 30 ml of heptane and pour it into the beaker. After mixing uniformly, add 200 ml of methanol and stir for 15 minutes. The mixed solution was introduced into a 1-liter separatory funnel, and stratification occurred after standing for several hours. The lower clear liquid was taken out and rotated at 70 degrees Celsius to finally obtain the polymer precursor PPM.

0.3 g of photoinitiator 819, 3.0 g of light control particle LCP, 26.9 g of suspension medium SM and 70.0 g of polymer precursor PPM are mixed uniformly to obtain a suspended particle light valve matrix emulsion. The suspended particle light valve matrix emulsion was coated with a doctor blade type automatic film coating machine (MSK-AFA-III type, MTI Corporation) on the transparent electrode with a protective layer prepared in [Example 1], with a thickness of 60 microns. Use X200-150 UV curing machine produced by Aventk Company to cure, adjust the power to 700W/m2, and cure time 30s to obtain a light control layer on the suspended particle light valve wet film to cover another layer [Example 1] prepared with a protective layer Transparent electrode to obtain suspended particle light valve with protective layer.

[Example 9] Preparation of wet film of suspended particle light valve

Same as [Example 8], except that the transparent electrode with protective layer prepared in [Example 2] is used.

[Example 10] Preparation of wet film of suspended particle light valve

Same as [Example 8], except that the transparent electrode with protective layer prepared in [Example 3] is used.

[Example 11] Preparation of wet film of suspended particle light valve

Same as [Example 8], except that the transparent electrode with protective layer prepared in [Example 4] is used.

[Example 12] Preparation of suspended particle light valve wet film

Same as [Example 8], except that the transparent electrode with protective layer prepared in [Example 5] is used.

[Example 13] Preparation of wet film of suspended particle light valve

Same as [Example 8], except that the transparent electrode with protective layer prepared in [Example 6] is used.

[Example 14]

Same as [Example 8], except that the transparent electrode with protective layer prepared in [Example 7] is used.

[Comparative Example 1]

Same as [Example 8], except that ITO/PET is directly used as a transparent electrode.

The following data tables obtained through experiments can more specifically illustrate the advantages of the method of the present invention.

The following Table 1, Table 2, and Table 3 list the different performance test results of each suspended particle light valve.

Table 1 Results of the viscosity evaluation of the light control layer of the suspended particle light valve

In the "protection layer type" in Table 1, each material represents a sub-layer, and the arrangement direction from left to right corresponds to from the electrode side to the corresponding light control layer side. For example, Example 14 represents that the protective layer has a three-layer structure, and the material of the sub-layer close to the light control layer is modified acrylic. Similarly, Example 8, Example 9, and Example 11 represent that the protective layer has a two-layer structure, and the material of the sub-layer near the light control layer is acrylate. And Example 13 represents a single protective layer.

It can be seen from Table 1 that the adhesion of the protective layer-containing suspended particle light valve produced by the method of the present invention is far better than that of the prior art 1. Compared with the prior art method, the adhesion quality High, and high bonding quality means strong bonding force between the light control layer and the protective layer and the transparent electrode, which is more suitable for commercial products.

Table 2 Stability evaluation results of suspended particle light valve

In the "protection layer type" in Table 2, each material shown represents a sublayer, and the arrangement direction from left to right corresponds to from the electrode side to the corresponding light control layer side. For example, Example 14 represents a three-layer protective layer structure, and the material of the sub-layer close to the corresponding light control layer is modified acrylic. Similarly, Example 8, Example 9, Example 10, Example 11, and Example 12 represent a 2-layer structure protective layer, and Example 13 represents a single-layer protective layer.

As shown in Table 2, the suspended particle light valve made in Examples 8-14 in the environmental box can greatly slow down the dark state fading speed and the bright state performance degradation of the light valve under high humidity, strong light, and high temperature conditions. It can be seen that the protective layer plays a great role in isolating humidity and avoiding contact between the light control layer and the metal oxide layer.

That is, the light valve manufactured by the technical method of the present invention can greatly improve the stability of the light valve, and the performance of the light valve is much better than that of the suspended particle light valve manufactured by using the prior art.

In summary, the method for preparing a suspended particle light valve containing a protective layer designed in the present invention greatly increases the viscosity and stability of the light valve device, increases the life of the suspended particle light valve, and effectively prevents the performance of the light valve. attenuation. At the same time, it is ensured that the addition of a protective layer has only a weak effect on the performance of the light valve itself.

The protective layer of the above-mentioned embodiment has a two-layer structure. Single-layer or three-layer or more layer structures are also possible, all of which can achieve the above-mentioned effects.

In implementation variants, protective layers can be provided on the transparent conductive film sides of the two transparent electrodes. The protective layer on the transparent conductive film side of each transparent electrode can be a single-layer or multi-layer structure, and the number of protective layers can be the same or different. . E.g. The protective layer on the transparent conductive film side of the first transparent electrode and the protective layer on the transparent conductive film side of the second transparent electrode may both have a two-layer structure, or the protective layer of the first transparent electrode may have a two-layer structure and the protection of the second transparent electrode The layer is a 3-layer structure. In another modification, the protective layer may be provided on the transparent conductive film side of the first transparent electrode, and the protective layer may not be provided on the transparent conductive film side of the second transparent electrode.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other. The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown in this text, but should conform to the widest scope consistent with the principles and novel features disclosed in this text.

The above are only preferred embodiments of the present invention, and do not limit the present invention in any form. Although the present invention has been disclosed as above in preferred embodiments, it is not intended to limit the present invention. Anyone familiar with the art, without departing from the scope of the technical solution of the present invention, can use the methods and technical content disclosed above to make many possible changes and modifications to the technical solution of the present invention, or modify it into equivalent changes. Examples. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments without departing from the technical solution of the present invention based on the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims (19)

A light valve includes a first transparent electrode, a second transparent electrode, and a suspended particle light control layer arranged between the first transparent electrode and the second transparent electrode, wherein: A first protective layer is provided between the first transparent electrode and the light control layer; and/or A second protective layer is arranged between the second transparent electrode and the light control layer. The light valve according to claim 1, wherein the first protective layer and the second protective layer have a single-layer or multi-layer structure. The light valve according to claim 2, wherein the material of any sub-layer in the single-layer or multi-layer structure includes epoxy resin, polyurethane, polyimide resin, polystyrene resin, acrylic resin, modified A kind of acrylic and silica gel. The light valve according to claim 2, wherein, in the protective layer of the single-layer or multi-layer structure, the material of the sub-layer adjacent to the suspended particle light control layer includes a main component of acrylic acid ester and modified acrylic acid. , One of silica gel. The light valve according to claim 1, wherein the thickness of the first protective layer and/or the second protective layer is 0.5-10 microns. The light valve according to claim 1, wherein the thickness of the first protective layer and/or the second protective layer is 0.8-5 microns. The light valve according to claim 1, wherein the thickness of the first protective layer and/or the second protective layer is 1 to 3 microns. The light valve according to claim 2, wherein the single-layer or multi-layer structure is one-layer or two-layer or three-layer. The light valve according to claim 2, wherein the thickness of each sub-layer in the single-layer or multi-layer structure is 0.5-10 microns. The light valve according to claim 2, wherein the thickness of each sub-layer in the single-layer or multi-layer structure is 0.6-5 microns. The light valve according to claim 2, wherein the thickness of each sub-layer in the single-layer or multi-layer structure is 0.8-2 microns. The light valve according to claim 1, wherein the first protective layer and the second protective layer are formed as follows: the protective layer polymer precursor RP is respectively coated on the conductive sides of the first transparent electrode and the second transparent electrode to Forming a glue protective layer; the glue protective layer on the first transparent electrode and the second transparent electrode are respectively subjected to ultraviolet UV radiation or thermal curing to form a protective layer on the first transparent electrode and a protection on the second electrode Floor. The light valve of claim 1, wherein the light control layer is a light valve matrix emulsion containing polymer precursor PPM, suspension medium SM, light control particles LCP and photoinitiator PI coated on a transparent electrode containing a protective layer The light valve matrix emulsion layer formed on the side of the protective layer. The light valve according to claim 13, wherein the thickness of the light valve matrix emulsion layer is 10-100 microns. The light valve according to claim 13, wherein the length of the light control particle LCP is in the range of 100-500 nm, and the diameter is 20-100 nm. The method according to claim 13, wherein the composition of the light control particles LCP _{is at least one of titanium dioxide (TiO 2} ), polyhalides, and chloroapatite. The method of claim 13, wherein the mass amount of the photoinitiator accounts for 0.1%-1% of the light valve matrix emulsion. The method of claim 13, wherein the photoinitiator is selected from at least one of 184, ITX, 819, 1173, BDK, BP, TPO, 369, and 907. The method of claim 13, wherein the light valve base emulsion further comprises a stabilizer and/or emulsifier.

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