Flowmeter electrochromic display device structure and preparation process

Abstract

The invention discloses a flowmeter electrochromism display device structure and a preparation technology, and relates to the technical field of electrochromism display, the flowmeter electrochromism display device structure comprises a PCB array module and an electrochromism module, the PCB array module takes a PCB substrate as a carrier, and a driving IC and a driving circuit are integrated on the PCB substrate; the electrochromic module comprises a solid electrolyte membrane array and an electrochromic membrane array. According to the invention, independent display of a single segment code pixel element is realized, and through the unique structural design of the PCB array module, the solid electrolyte membrane array and the electrochromic membrane array, each part is in one-to-one correspondence to form an independent controllable segment code pixel component. The driving IC and the driving circuit are integrated on the PCB array module, each pixel element can be accurately controlled, the device can achieve independent display of a single segment code pixel element, the requirement for accurate display control of a specific area in scenes such as a local adjustable opaque system is met, and the device has great advantages in the field of display instruments.

Description

Technical Field

[0001] The present invention relates to the technical field of electrochromic display, and more specifically, to a structure and preparation process of an electrochromic display device for a flow meter. Background Art

[0002] Electrochromic phenomenon, that is, under the action of an electric field and current, a material undergoes an oxidation-reduction reaction through an electrochemical process, thereby generating reversible color change. This characteristic enables electrochromic devices to exhibit great application potential in many fields. The structure of an electrochromic system is relatively complex and generally consists of five layers, namely an electrochromic layer (EC), an ion-conducting layer (IC), an ion storage layer (IS), and transparent conductive layers (TC) and printed circuit boards (PCB boards) on both sides. When a DC voltage of 1 - 5V is applied between the transparent conductive layer and the PCB board, conductive ions move back and forth between the ion storage layer and the electrochromic layer, thereby realizing the change of the device color and transmittance.

[0003] In the field of consumer electronics, especially in flow meter displays, electrochromic devices have a broad application market. However, existing electrochromic devices have some significant limitations. The conductive layers on both sides usually continuously cover the entire area that needs to change color, and this structure makes it impossible to achieve local color change, greatly limiting its application in locally adjustable opaque systems. For example, in some scenarios where precise display control of a specific area is required, existing devices are difficult to meet the requirements.

[0004] At the same time, with the increasing global attention to energy conservation and environmental protection, electrochromic glass has been widely used in the display industry due to its excellent properties such as safety, sound insulation, heat insulation, and ultraviolet resistance. Its excellent heat insulation performance mainly stems from the fact that the thermal conductivity coefficient of the polymer material in the middle of the laminated glass is much lower than that of ordinary glass, which significantly hinders the heat flow during the heat transfer process.

[0005] However, most of the commonly used electrochromic glasses currently adopt liquid electrolytes as the ion transport layer, which brings great difficulties to the encapsulation of electrochromic glasses. The fluidity of the liquid electrolyte requires special processes and materials to prevent leakage during the encapsulation process, increasing the production cost and process complexity. Moreover, the liquid electrolyte is not conducive to large-area display, and problems such as uneven ion distribution are likely to occur during the large-area preparation process, affecting the consistency and stability of the display effect. At the same time, existing flowmeter display screens include LCD, LED, OLED, electronic paper (E-Ink), TFT-LCD, segment displays, etc. Each has its applicable scenarios, but they have high power consumption and cannot achieve the scenario of long-term power supply with a battery for the flowmeter. Although electronic paper has low power consumption, its driving voltage is high and the cost is high. OLED is suitable for high contrast but has high power consumption. The electrochromic segment display has a low cost and is suitable for flowmeters with simple displays, with low power consumption and a wide temperature range (-20°C - 80°C). The substrate of the existing electrochromic segment display is based on a glass resin board substrate with electrodes deposited on it, and a large number of electrode leads need to be connected to the driving IC, resulting in an increase in cost.

[0006] In terms of related technology research, Chinese Patent CN112904636A discloses an electrochromic device and an electronic terminal including the same. The electrochromic device includes an extraction electrode and a first base layer, a first conductive layer, an electrochromic layer, a second conductive layer, and a second base layer stacked in sequence. Among them, the first conductive layer has at least one first region and at least one second region. By setting the first notch and the conductive channel, the display of a pattern is achieved during the color change process, achieving the effect of information display or enhancing the sense of appearance design. However, due to the adoption of a passive control circuit, the pattern display is single, the display cannot be refreshed, and the flexibility and functionality in practical applications are limited.

[0007] In response to the problems in the related technology, no effective solution has been proposed yet. Summary of the Invention

[0008] In response to the problems in the related technology, the present invention proposes a structure and preparation process of an electrochromic display device for a flowmeter to solve the above problems existing in the existing electrochromic devices, realize the independent display of a single segment code pixel element, improve the clarity and response speed of the device, have the functions of steady-state display and display refresh, and meet the requirements of high efficiency and energy saving.

[0009] The technical solution of the present invention is realized as follows:

[0010] On the one hand, the present invention:

[0011] A structure of an electrochromic display device for a flowmeter includes: a PCB array module and an electrochromic module, wherein;

[0012] The PCB array module uses a PCB substrate as a carrier, on which a driving IC and a driving circuit are integrated; the electrochromic module includes a solid electrolyte membrane array and an electrochromic membrane array, and the solid electrolyte membrane array transfers charges between the PCB array module and the electrochromic membrane array through ion movement to realize the color display and fading of the electrochromic device.

[0013] Further, for the PCB array module, a PCB array is prepared on the PCB substrate through PCB technology, a driving IC is prepared with the PCB substrate as a carrier, and the driving IC, the driving circuit and the PCB array are integrated to form the PCB array module.

[0014] Further, the solid electrolyte membrane array uses a polyimide film as a substrate material, and the polyimide film is made into a grid complementary to the PCB array module through laser engraving to form a polyimide grid. An electrolyte membrane corresponding to the PCB array module is prepared at each intersection of the formed polyimide grid through a printing process, thereby forming the solid electrolyte membrane array.

[0015] Further, the electrolyte membrane is a polymer lithium salt slurry, and the polymer lithium salt slurry is formed by dissolving a lithium salt and a polymer carrier in an alcohol organic solvent to form a uniform slurry, and is heated and cured after a printing process to form an electrolyte membrane, where; the inorganic lithium salt is one or more of lithium perchlorate, lithium carbonate, lithium fluoride, and lithium tetrafluoroborate, and the polymer carrier is one or more of TPU, PVB, and EVA.

[0016] Further, the electrochromic membrane array uses an ITO conductive film as a conductive substrate, and an electrochromic membrane corresponding to the PCB array is prepared on the surface of the ITO conductive film through a magnetron sputtering process and a common electrode is reserved.

[0017] Further, the electrochromic material of the electrochromic membrane is one or more inorganic color-changing materials such as tungsten oxide, molybdenum oxide, and nickel oxide.

[0018] On the other hand of the present invention:

[0019] A preparation process for an electrochromic display device of a flowmeter includes the following steps:

[0020] Step S1: Prepare a PCB array module. Select a PCB substrate with appropriate specifications, process and prepare a PCB array using PCB technology, prepare a driving IC on the PCB substrate, and prepare a driving circuit using printed circuit technology. Integrate the driving IC, the driving circuit and the PCB array to form a PCB array module;

[0021] Step S2: Prepare a solid electrolyte membrane array. Select a polyimide film as the substrate material, and use a laser engraving device to engrave it into a grid-like structure complementary to the PCB array. Dissolve, mix, and filter lithium salt, polymer carrier, plasticizer, defoamer, and antioxidant in an alcohol organic solvent to obtain an electrolyte slurry. Use a printing device to print the electrolyte slurry at the intersections of the grid, and heat and cure to form a solid electrolyte membrane array;

[0022] Step S3: Prepare an electrochromic membrane array. Perform surface cleaning treatment on a transparent ITO conductive film as the conductive substrate. After mixing one or more inorganic discoloration materials such as tungsten oxide, molybdenum oxide, and nickel oxide, use a magnetron sputtering process to prepare an electrochromic membrane corresponding to the PCB array on the surface of the ITO conductive film and reserve a common electrode to form an electrochromic membrane array;

[0023] Step S4: Carry out device assembly and testing. Assemble the prepared PCB array module, solid electrolyte membrane array, and electrochromic membrane array according to the corresponding relationship, connect the common electrode, drive IC, and drive circuit, apply a ±1.5V or 3 - 5V DC voltage, perform drive testing through IC chip control, and adjust and optimize the device according to the test results.

[0024] Advantages of the present invention:

[0025] 1. The present invention realizes the independent display of a single segment code pixel element. Through the unique structural design of the PCB array module, solid electrolyte membrane array, and electrochromic membrane array, each part corresponds one by one to form a separately controllable segment code pixel device. The drive IC and drive circuit are integrated on the PCB array module, which can accurately control each pixel element, enabling the device to realize the independent display of a single segment code pixel element and meeting the demand for precise display control of specific areas in scenarios such as locally adjustable opaque systems.

[0026] 2. The present invention improves the clarity and response speed of the device. Select inorganic discoloration materials such as tungsten oxide, molybdenum oxide, and nickel oxide as the materials of the electrochromic membrane, cooperate with the ion transport of the solid electrolyte membrane array, and the drive control of the PCB array module, making the electrochromic process more efficient. When applying a ±1.5V or 3 - 5V DC voltage for drive testing, the device can respond quickly and has high display clarity, ensuring the accuracy and timeliness of information display.

[0027] 3. The present invention has the functions of steady-state display and display refreshing. The device structure and manufacturing process ensure the stability of the electrochromic process, and good display effects can be maintained in different display states, achieving steady-state display. At the same time, different from the prior art that uses a passive control circuit resulting in a single pattern display and no display refreshing, the device of the present invention can be driven and tested by an IC chip control, and the device can be adjusted and optimized according to the test results. It has the function of display refreshing, improving the flexibility and functionality in practical applications, making the device have great advantages in the field of display instruments.

[0028] 4. The present invention meets the requirements of high efficiency and energy conservation. It uses a solid electrolyte membrane array to replace the traditional liquid electrolyte, avoiding the leakage problem of the liquid electrolyte during the encapsulation process, reducing the production cost and process complexity. The solid electrolyte is beneficial to large-area display, can ensure uniform ion distribution, improve the consistency and stability of the display effect, and does not require excessive energy and materials to prevent the leakage of the liquid electrolyte, thus meeting the requirements of high efficiency and energy conservation. At the same time, the substrate of the electrochromic segment display screen is an electrode deposited on a PCB board, without the need to externally connect electrode leads to the driving IC, greatly reducing the manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0030] Figure 1 is a schematic structural diagram of a flowmeter electrochromic display device structure according to an embodiment of the present invention Figure 1 ;

[0031] Figure 2 is a schematic structural diagram of a flowmeter electrochromic display device structure according to an embodiment of the present invention Figure 2 ;

[0032] Figure 3 is a schematic diagram of a PCB array module of a flowmeter electrochromic display device structure according to an embodiment of the present invention;

[0033] Figure 4 is a schematic diagram of a solid electrolyte membrane array of a flowmeter electrochromic display device structure according to an embodiment of the present invention;

[0034] Figure 5 is a schematic diagram of an electrochromic membrane array of a flowmeter electrochromic display device structure according to an embodiment of the present invention;

[0035] Figure 6 It is a schematic flow chart of a preparation process of an electrochromic display device for a flow meter according to an embodiment of the present invention;

[0036] Figure 7 It is a schematic connection diagram of a driving IC of a structure of an electrochromic display device for a flow meter according to an embodiment of the present invention.

[0037] In the figure:

[0038] 1. PCB array module; 2. Solid electrolyte membrane array; 3. Electrochromic membrane array;

[0039] 101. PCB array; 102. Driving IC; 103. Driving circuit;

[0040] 201. Polyimide film; 202. Polyimide grid; 203. Solid electrolyte membrane;

[0041] 301. ITO conductive film; 302. Electrochromic membrane; 303. Common electrode. Specific embodiments

[0042] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with 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 belong to the scope of protection of the present invention.

[0043] According to an embodiment of the present invention, a structure of an electrochromic display device for a flow meter is provided.

[0044] As Figures 1-5 and Figure 7 shown, the structure of the electrochromic display device for a flow meter according to an embodiment of the present invention includes: a PCB array module 1 and an electrochromic module, wherein;

[0045] The PCB array module 1 uses a PCB substrate as a carrier, on which a driving IC 102 and a driving circuit 103 are integrated; the electrochromic module includes a solid electrolyte membrane array 2 and an electrochromic membrane array 3, and the solid electrolyte membrane array 2 transfers charges between the PCB array module 1 and the electrochromic membrane array through ion movement to realize the coloring and fading of the electrochromic device.

[0046] Among them, for the PCB array module 1, a PCB array 101 is prepared on the PCB substrate through PCB technology, a driving IC 102 is prepared with the PCB substrate as a carrier, and the driving IC 102, the driving circuit 103 and the PCB array 101 are integrated to form the PCB array module 1.

[0047] Among them, the solid electrolyte membrane array 2 uses a polyimide film 201 as a substrate material. The polyimide film 201 is made into a grid complementary to the PCB array module 1 through laser engraving to form a polyimide grid 202. An electrolyte membrane corresponding to the PCB array module 1 is prepared at each intersection of the formed polyimide grid 202 through a printing process, thereby forming the solid electrolyte membrane array 2.

[0048] Among them, the electrolyte membrane is a polymer lithium salt slurry. The polymer lithium salt slurry is formed by dissolving a lithium salt and a polymer carrier in an alcohol organic solvent to form a uniform slurry, and is heated and cured through a printing process to form the electrolyte membrane. Among them, the inorganic lithium salt is one or more of lithium perchlorate, lithium carbonate, lithium fluoride, and lithium tetrafluoroborate, and the polymer carrier is one or more of TPU, PVB, and EVA.

[0049] Among them, the electrochromic membrane array 3 uses an ITO conductive film 301 as a conductive substrate, and an electrochromic membrane 302 corresponding to the PCB array 101 is prepared on the surface of the ITO conductive film 301 through a magnetron sputtering process, and a common electrode 303 is reserved.

[0050] Among them, the electrochromic material of the electrochromic membrane is one or more inorganic color-changing materials such as tungsten oxide, molybdenum oxide, and nickel oxide.

[0051] According to another embodiment of the present invention, a preparation process of a flowmeter electrochromic display device is provided.

[0052] As Figure 6 shown, the preparation process of the flowmeter electrochromic display device according to the embodiment of the present invention includes the following steps:

[0053] Step S1, prepare the PCB array module in advance, including the following steps:

[0054] Select a PCB substrate with a suitable specification, and process it using PCB technology according to the design requirements to prepare a PCB array with a specific circuit layout;

[0055] On the PCB substrate, prepare a driving IC through an integrated circuit manufacturing process to ensure that it can accurately control the signal transmission in the horizontal direction;

[0056] Adopt printed circuit technology to prepare a driving circuit so that it can work in cooperation with the driving IC to achieve the full driving of the electrochromic membrane array;

[0057] Integrate the driving IC, the driving circuit and the PCB array, and form a stable PCB array module through welding and packaging processes.

[0058] Step S2, prepare the solid electrolyte membrane array, including the following steps:

[0059] Select a polyimide film as the substrate material. Using a laser engraving device, according to the design complementary to the PCB array, engrave the polyimide film into a grid-like structure to form a polyimide grid.

[0060] Fully dissolve, mix, and filter lithium salt, polymer carrier, plasticizer, defoamer, and antioxidant in an alcohol-based organic solvent to obtain a uniform electrolyte slurry.

[0061] In this technical solution, specifically, the lithium salt can be selected from one or more of lithium perchlorate, lithium carbonate, lithium fluoride, and lithium tetrafluoroborate; the polymer carrier is one or more of thermoplastic polyurethane elastomer rubber TPU, polyvinyl butyral PVB, and ethylene-vinyl acetate copolymer EVA. Dissolve the polymer carrier in an organic solvent to obtain a colorless, transparent, and uniformly viscous gel. Since TPU, PVB, and EVA have hydrolysis resistance, tensile resistance, excellent film-forming and impact resistance properties, and good adhesion properties to materials such as glass, metal, and fiber, their main use is as an intermediate adhesive film layer. Then, add lithium salt, plasticizer, defoamer, and antioxidant to the gel in sequence. The mass percentages of each substance added are approximately: lithium salt 25%, plasticizer 3%, defoamer 0.5%, and antioxidant 0.5%. Mix by ball milling for more than 24 hours and then filter to obtain the electrolyte slurry.

[0062] Use a printing device to print the electrolyte slurry on each intersection of the polyimide grid to form a solid electrolyte membrane. After printing, through a heat curing process, make the performance of the solid electrolyte membrane more stable, thereby preparing a solid electrolyte membrane array.

[0063] Step S3, prepare an electrochromic membrane array, including the following steps:

[0064] Take a transparent ITO conductive film as the conductive substrate, clean its surface to ensure the surface is flat and free of impurities.

[0065] Mix one or more inorganic discoloration materials such as tungsten oxide, molybdenum oxide, and nickel oxide in a certain proportion (the proportion can be adjusted according to actual needs to obtain different display effects), and use a magnetron sputtering process to prepare an electrochromic membrane corresponding to the PCB array module on the surface of the ITO conductive film to form an electrochromic membrane array.

[0066] Among them, the electrochromic membrane array, the PCB array module, and the solid electrolyte membrane array correspond one by one to form individually controllable segment code pixel components, ensuring that the device can achieve a fast response.

[0067] In this technical solution, during the preparation of the electrochromic membrane, a common electrode is reserved for subsequent connection to an external power supply.

[0068] Step S4, perform device assembly and testing, including the following steps:

[0069] Assemble the prepared PCB array module, solid electrolyte membrane array, and electrochromic membrane array according to the corresponding relationship to ensure that all parts are tightly and accurately connected.

[0070] Connect the common electrode, driving IC, and driving circuit, apply a ±1.5V or 3 - 5V DC voltage, and perform control and driving tests through the IC chip.

[0071] In this technical solution, observe the display situation of a single segment code pixel element, and detect the clarity, response speed, and steady - state display performance of the device. And according to the test results, make necessary adjustments and optimizations to the device, specifically such as: adjusting the driving voltage, checking the connection lines, to ensure that the device performance meets the expected requirements.

[0072] In summary, by means of the above - mentioned technical solution of the present invention, the following effects can be achieved:

[0073] 1. The present invention realizes the independent display of a single segment code pixel element. Through the unique structural design of the PCB array module, solid electrolyte membrane array, and electrochromic membrane array, each part corresponds one - to - one to form a separately controllable segment code pixel device. The driving IC and driving circuit are integrated on the PCB array module, which can accurately control each pixel element, enabling the device to realize the independent display of a single segment code pixel element, meeting the demand for precise display control of specific areas in scenarios such as locally adjustable opaque systems.

[0074] 2. The present invention improves the clarity and response speed of the device. Inorganic discoloration materials such as tungsten oxide, molybdenum oxide, and nickel oxide are selected as the materials of the electrochromic membrane. Combined with the ion transport of the solid electrolyte membrane array and the driving control of the PCB array module, the electrochromic process becomes more efficient. When applying a ±1.5V or 3 - 5V DC voltage for driving tests, the device can respond quickly and has high display clarity, ensuring the accuracy and timeliness of information display.

[0075] 3. The present invention has the functions of steady - state display and display refreshing. The device structure and preparation process ensure the stability of the electrochromic process, and good display effects can be maintained in different display states, realizing steady - state display. At the same time, different from the prior art that uses a passive control circuit resulting in a single pattern display and no display refreshing, the device of the present invention can be driven and tested through the control of the IC chip, and adjusted and optimized according to the test results, having the function of display refreshing, improving the flexibility and functionality in practical applications.

[0076] 4. The present invention meets the requirements of high efficiency and energy conservation. It uses a solid electrolyte membrane array to replace the traditional liquid electrolyte, avoiding the leakage problem of liquid electrolyte during the encapsulation process, reducing production costs and process complexity. The solid electrolyte is beneficial for large-area display, can ensure uniform ion distribution, improve the consistency and stability of the display effect, and does not require excessive energy and materials to prevent the leakage of liquid electrolyte, thus meeting the requirements of high efficiency and energy conservation.

[0077] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. After considering the disclosure in the specification and the embodiments, those skilled in the art will easily think of other implementation schemes of the present disclosure. This application aims to cover any variations, uses or adaptations of the present disclosure, which follow the general principles of the present disclosure and include the common general knowledge or conventional technical means in the technical field not disclosed in the present disclosure. The specification and the embodiments are only regarded as exemplary, and the true scope and spirit of the present disclosure are pointed out by the claims.

[0078] It should be understood that the present disclosure is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is only limited by the appended claims.

Claims

1. A structure of an electrochromic display device for a flowmeter, characterized in that, Including: a PCB array module (1) and an electrochromic module, wherein; The PCB array module (1) uses a PCB substrate as a carrier, on which a driving IC (102) and a driving circuit (103) are integrated; the electrochromic module includes a solid electrolyte membrane array (2) and an electrochromic membrane array (3), and the solid electrolyte membrane array (2) transfers charges between the PCB array module (1) and the electrochromic membrane array through ion movement to realize the coloring and fading of the electrochromic device.

2. The structure of the flowmeter electrochromic display device according to claim 1, wherein For the PCB array module (1), a PCB array (101) is prepared on the PCB substrate through PCB technology, a driving IC (102) is prepared with the PCB substrate as a carrier, and the driving IC (102), driving circuit (103) and the PCB array (101) are integrated to form the PCB array module (1).

3. The structure of the electrochromic display device of the flowmeter according to claim 1, wherein The solid electrolyte membrane array (2) uses a polyimide film (201) as a substrate material, and the polyimide film (201) is made into a grid complementary to the PCB array module (1) through laser engraving to form a polyimide grid (202), and an electrolyte membrane corresponding to the PCB array module (1) is prepared at each intersection of the formed polyimide grid (202) through a printing process, thereby forming the solid electrolyte membrane array (2).

4. The structure of the electrochromic display device of the flowmeter according to claim 3, characterized in that, The electrolyte membrane is a polymer lithium salt slurry, and the polymer lithium salt slurry is formed by dissolving a lithium salt and a polymer carrier in an alcohol organic solvent to form a uniform slurry, and is heated and cured after a printing process to form an electrolyte membrane, wherein; the inorganic lithium salt is one or more of lithium perchlorate, lithium carbonate, lithium fluoride, and lithium tetrafluoroborate, and the polymer carrier is one or more of TPU, PVB, and EVA.

5. The structure and preparation process of the electrochromic display device of the flowmeter according to claim 1, characterized in that, The electrochromic membrane array (3) uses an ITO conductive film (301) as a conductive substrate, and an electrochromic membrane (302) corresponding to the PCB array (101) is prepared on the surface of the ITO conductive film (301) through a magnetron sputtering process, and a common electrode (303) is reserved.

6. The structure and preparation process of the electrochromic display device of the flowmeter according to claim 5, characterized in that, The electrochromic material of the electrochromic membrane is one or more inorganic color-changing materials such as tungsten oxide, molybdenum oxide, and nickel oxide.

7. A preparation process of an electrochromic display device for a flowmeter, which is used for preparing the structure of the electrochromic display device for a flowmeter described in any one of claims 1-6, characterized in that, The preparation process includes the following steps: Step S1: Prepare a PCB array module. Select a PCB substrate with appropriate specifications, process and prepare a PCB array using PCB technology, prepare a driving IC on the PCB substrate, and prepare a driving circuit using printed circuit technology. Integrate the driving IC, driving circuit and the PCB array to form a PCB array module; Step S2: Prepare a solid electrolyte membrane array. Select a polyimide film as a substrate material, use a laser engraving device to engrave it into a grid-like structure complementary to the PCB array, dissolve, mix, and filter a lithium salt, a polymer carrier, a plasticizer, an antifoaming agent, and an antioxidant in an alcohol organic solvent to obtain an electrolyte slurry, and use a printing device to print the electrolyte slurry at the intersections of the grid, and heat and cure to form a solid electrolyte membrane array; Step S3: Prepare an electrochromic film array. Clean the surface of a transparent ITO conductive film as the conductive substrate. After mixing one or more inorganic color-changing materials such as tungsten oxide, molybdenum oxide, and nickel oxide, use a magnetron sputtering process to prepare an electrochromic film corresponding to the PCB array on the surface of the ITO conductive film and reserve a common electrode to form an electrochromic film array; Step S4: Perform device assembly and testing. Assemble the prepared PCB array module, solid electrolyte film array, and electrochromic film array according to the corresponding relationship, connect the common electrode, drive IC, and drive circuit, apply a ±1.5V or 3 - 5V DC voltage, perform drive testing through IC chip control, and adjust and optimize the device according to the test results.

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