Multilayer structure with light transmission and invisibility and preparation method thereof

Abstract

The invention relates to the technical field of shells, and discloses a light-transmitting invisible multilayer structure and a preparation method thereof. The preparation method comprises the following steps: coating one side of the transparent bearing film with a transparent liquid coating; the protrusions of the transfer printing mold are pressed on the liquid coating, the liquid coating is cured, the transfer printing mold is stripped after curing, the cured liquid coating forms pits matched with the protrusions in shape, and a concave perspective layer is obtained; printing a shading layer on the surface of one side, away from the transparent bearing film, of the sunken perspective layer except the sunken part through a planographic printing process, so that a first through hole communicated with the sunken part is formed in the position, corresponding to the sunken part, of the shading layer; and printing a decorative layer on the surface, except the first through hole, of one side, far away from the transparent bearing film, of the shading layer through a planographic printing process, so that a second through hole communicated with the first through hole is formed in the position, corresponding to the first through hole, of the decorative layer, the second through hole is communicated with the recess through the first through hole to form a light hole, and a multi-layer structure is obtained. The process for preparing the multi-layer structure is simple, the cost is low, the efficiency is high, and the light transmission effect and the display effect of the multi-layer structure are good.

Description

Technical Field

[0001] The present invention relates to the technical field of shells, and in particular to a multi-layer structure with light transmission and invisibility and a preparation method thereof. Background Art

[0002] In many decorative and functional applications, it is necessary to allow some areas to be transparent while maintaining beautiful patterns. For example, in smart home devices, it is usually necessary to hide the display screen on the device shell. When not in use, the display screen is hidden and integrated with the shell pattern, and when needed, information is displayed through the transparent area; in the design of automobile dashboards, information is also required to be displayed through the transparent area on the decorative panel; in furniture and decorations, the light source effect is achieved through the transparent area on the decorative panel to improve the added value and aesthetics of the product.

[0003] In modern decorative and functional applications, light-transmitting invisible display panel technology is gaining increasing attention. This technology combines beauty and functionality by designing a light-transmitting area on a panel with a decorative pattern, so that the panel can display a screen or light source hidden underneath under certain conditions. Common application scenarios include smart home devices, car dashboards, home decorations, billboards, and electronic product housings. However, traditional light-transmitting invisible panel technology usually involves complex structural design and high-cost manufacturing processes, such as laser cutting or micron-level processing technology. These methods are not only costly but also have low production efficiency and are difficult to adapt to large-scale production needs.

[0004] In order to overcome these technical bottlenecks, researchers and engineers have explored a variety of new materials and processes. For example, photochromic materials, electrochromic materials, and thermochromic materials can change the transparency of materials through changes in light, voltage, or temperature, thereby achieving the effect of invisible or showing the bottom screen. Liquid crystal display technology and smart glass technology use electrical control to adjust the transparency of materials and provide efficient light control. In addition, micro shutter technology and controllable light-transmitting coatings adjust the light-transmitting area through mechanical or electrical control to achieve precise light transmission control.

[0005] Although these new technologies provide a variety of methods for realizing light-transmitting invisible display panels, they still have certain limitations, such as high material cost, complex process and limited scope of application. Therefore, developing a simple, efficient and low-cost multi-layer structure of light-transmitting invisible display panels and its preparation method has become the key to solving this problem. Summary of the invention

[0006] The main purpose of the present invention is to provide a multi-layer structure with light transmission and invisibility and a preparation method thereof, aiming to solve the technical problems of the prior art of preparing multi-layer structures with complex processes, high costs and low production efficiency.

[0007] To achieve the above object, the present invention provides a method for preparing a multilayer structure having light-transmitting and invisible properties, the method comprising: providing a transparent carrier film, and coating a layer of transparent liquid coating on one side of the transparent carrier film;

[0008] Providing a transfer mold with a preset protrusion, pressing the protrusion of the transfer mold onto the liquid coating, and curing the liquid coating, peeling off the transfer mold after curing, so that the cured liquid coating forms a depression that matches the shape of the protrusion, thereby obtaining a concave perspective layer;

[0009] Printing a light shielding layer on a surface other than the depression on a side of the depression perspective layer away from the transparent carrier film by a flat printing process, so that the light shielding layer has a first through hole communicating with the depression at a position corresponding to the depression;

[0010] A decorative layer is printed on the surface of the light-shielding layer on the side away from the transparent carrier film except for the first through hole through a flat printing process, so that the decorative layer has a second through hole connected to the first through hole at a position corresponding to the first through hole, and the second through hole is connected to the recess through the first through hole to form a light-transmitting hole, thereby obtaining a multi-layer structure.

[0011] Further, in one embodiment, the step of printing the light shielding layer on the surface other than the depression on the side of the depression perspective layer away from the transparent carrier film by a lithographic printing process is formed in three steps, including:

[0012] Providing a printing plate with preset graphic information, and applying ink on the side of the printing plate with the graphic information;

[0013] transferring the ink to a rubber blanket;

[0014] The side of the rubber blanket having the ink is covered on the side of the recessed perspective layer away from the transparent carrier film, and pressure is applied so that the ink is transferred from the rubber blanket to the surface of the recessed perspective layer except the recess, thereby forming the shading layer having the first through hole.

[0015] Furthermore, in one embodiment, the step of providing a printing plate with preset graphic information and applying ink on the side of the printing plate with the graphic information is formed in three steps, including:

[0016] The preset graphic information is transferred to the printing plate by photography or electronic color separation, and the printing plate has an oleophilic and hydrophobic graphic area and a hydrophilic and oleophobic blank area, wherein the first graphic information includes one or more of patterns or texts;

[0017] Applying ink on the image area of ​​the printing plate so that the image area absorbs the ink;

[0018] The dampening liquid is used to wet the blank area of ​​the printing plate, so that a water film is formed on the blank area.

[0019] Further, in one embodiment, the transferring the ink to the rubber blanket comprises:

[0020] A rubber blanket is covered on the ink surface of the printing plate so that the ink on the printing plate is transferred from the printing plate to the rubber blanket.

[0021] Furthermore, in one embodiment, the decoration layer includes a pattern layer and a supporting layer, and the supporting layer is arranged on a side of the light shielding layer away from the transparent carrier film;

[0022] A pattern layer is arranged on a side of the supporting layer away from the light shielding layer.

[0023] Further, in one embodiment, the step of providing a transfer mold with a preset protrusion comprises:

[0024] The protrusions are arranged in plurality, and the transfer mold with the protrusions is obtained by mechanical processing according to the preset arrangement and size of the protrusions. The arrangement of the protrusions is one or more of an equilateral triangle grid arrangement, a square grid arrangement or a honeycomb grid arrangement.

[0025] Further, in one embodiment, after the decorative layer is printed on the surface of the light shielding layer other than the first through hole on the side away from the transparent carrier film by the flat printing process, so that the decorative layer has a second through hole connected to the first through hole at a position corresponding to the first through hole, and the second through hole is connected to the recess through the first through hole to form a light-transmitting hole, and the multi-layer structure is obtained, it also includes:

[0026] A filling layer is arranged on a side of the decoration layer away from the transparent supporting film and in the light-transmitting hole, and the filling layer fills the light-transmitting hole.

[0027] Furthermore, in one embodiment, after the step of providing a filling layer on a side of the decorative layer away from the transparent carrier film and in the light-transmitting hole, and the filling layer fills the light-transmitting hole, the method further includes:

[0028] An adhesive layer is provided on a side of the filling layer away from the transparent carrier film;

[0029] A light source of the multi-layer structure is arranged on a side of the transparent carrier film away from the adhesive layer; or,

[0030] Disposing an adhesive layer on a side of the transparent carrier film away from the filling layer;

[0031] A light source of the multi-layer structure is arranged on a side of the adhesive layer away from the filling layer.

[0032] The present invention also provides a method for preparing a multilayer structure having light-transmitting and invisible properties, the method comprising: providing a transparent carrier film, and coating a layer of transparent liquid coating on one side of the transparent carrier film;

[0033] Providing a transfer mold with a preset protrusion, pressing the protrusion of the transfer mold onto the liquid coating, and curing the liquid coating, peeling off the transfer mold after curing, so that the cured liquid coating forms a depression that matches the shape of the protrusion, thereby obtaining a concave perspective layer;

[0034] Printing a decorative layer on a surface other than the recess on a side of the recessed perspective layer away from the transparent carrier film by a flat printing process, so that the decorative layer has a second through hole communicating with the recess at a position corresponding to the recess;

[0035] A light-shielding layer is printed on the surface of the decorative layer on the side away from the transparent carrier film except for the second through hole through a flat printing process, so that the position of the light-shielding layer corresponding to the second through hole has a first through hole connected to the second through hole, and the first through hole is connected to the recess through the second through hole to form a light-transmitting hole, thereby obtaining a multi-layer structure.

[0036] Furthermore, in one embodiment, the decorative layer includes a pattern layer and a supporting layer, and the pattern layer is disposed on a side of the recessed perspective layer away from the transparent carrier film;

[0037] A supporting layer is arranged on a side of the pattern layer away from the recessed perspective layer.

[0038] Further, in one embodiment, after printing a light shielding layer on a surface other than the second through hole on a side of the decorative layer away from the transparent carrier film by the flat printing process, so that a position of the light shielding layer corresponding to the second through hole has a first through hole connected to the second through hole, and the first through hole is connected to the recess through the second through hole to form a light-transmitting hole, the multi-layer structure further includes:

[0039] A filling layer is arranged on a side of the light shielding layer away from the transparent supporting film and in the light transmission hole, and the filling layer fills the light transmission hole.

[0040] Furthermore, in one embodiment, after a filling layer is provided on a side of the light shielding layer away from the transparent carrier film and in the light transmission hole, and the filling layer fills the light transmission hole, the method further comprises:

[0041] Disposing an adhesive layer on a side of the transparent carrier film away from the filling layer;

[0042] A light source of the multi-layer structure is arranged on a side of the filling layer away from the adhesive layer.

[0043] Furthermore, in one embodiment, after a filling layer is provided on a side of the light shielding layer away from the transparent carrier film and in the light transmission hole, and the filling layer fills the light transmission hole, the method further comprises:

[0044] Disposing a surface treatment layer on a side of the transparent carrier film away from the filling layer;

[0045] Disposing an adhesive layer on a side of the filling layer away from the surface treatment layer;

[0046] A light source of the multi-layer structure is arranged on a side of the adhesive layer away from the filling layer.

[0047] The present invention also provides a light-transmitting and invisible multi-layer structure, which is manufactured by the preparation method.

[0048] The present invention also provides a light-transmitting and invisible multi-layer structure, wherein the multi-layer structure is manufactured by the preparation method.

[0049] In the technical solution provided by the present invention, a transparent liquid coating is coated on a transparent carrier film, and then the protrusions of a transfer mold with array-arranged protrusions preset in advance are pressed on the liquid coating, and then the liquid coating is cured, so that after the cured liquid coating is peeled off the transfer mold, depressions with the same arrangement, size and depth as the protrusions are formed to obtain a concave perspective layer, and the depressions make the concave perspective layer have an uneven surface, and at the same time, a light-shielding layer is printed on the concave surface of the concave perspective layer through a flat printing process. During printing, the ink of the light-shielding layer contacts the plane of the concave perspective layer, but the ink contacts the concave surface. There is no contact, and the applied pressure can only act on the plane, and the depression does not receive the force, so that the plane on the depressed perspective layer is printed with the covering layer, and the depression is not filled and covered by ink, so that the covering layer corresponds to the depression and has a first through hole connected to the depression. The same working principle is used to print the decorative layer on the covering layer, and the device layer is formed at a position corresponding to the first through hole and connected to the first through hole. The depression, the first through hole and the second through hole form a light-transmitting hole to obtain a multi-layer structure, so that the process for preparing a light-transmitting and invisible multi-layer structure is simple, low-cost and efficient, and the multi-layer structure has good light-transmitting effect and display effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] One or more embodiments are exemplarily described by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and the figures in the drawings do not constitute proportional limitations unless otherwise stated.

[0051] Figure 1 It is a schematic diagram of a first embodiment of a method for preparing a multi-layer structure having light-transmitting and invisible properties in an embodiment of the present invention;

[0052] Figure 2 It is a schematic diagram of a second embodiment of a method for preparing a multi-layer structure having light-transmitting and invisible properties in an embodiment of the present invention;

[0053] Figure 3 It is a schematic structural diagram of a multi-layer structure having light-transmitting and invisible properties according to a first embodiment of the present invention;

[0054] Figure 4 It is a schematic structural diagram of a multi-layer structure having light-transmitting and invisible properties according to a second embodiment of the present invention;

[0055] Figure 5 It is a schematic diagram of a third embodiment of a method for preparing a multi-layer structure having light-transmitting and invisible properties in an embodiment of the present invention;

[0056] Figure 6 It is a schematic structural diagram of a multi-layer structure having light-transmitting and invisible properties according to a third embodiment of the present invention;

[0057] Figure 7 FIG. 4 is a schematic structural diagram of a multi-layer structure having light-transmitting and invisible properties according to a fourth embodiment of the present invention. DETAILED DESCRIPTION

[0058] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on another element, or there can be one or more centered elements therebetween. When an element is described as "connected" to another element, it can be directly connected to another element, or there can be one or more centered elements therebetween. The terms "vertical", "horizontal", "left", "right", "inside", "outside" and similar expressions used in this specification are only for illustrative purposes. In the description of the present invention, the terms "first" and "second" are used only for descriptive purposes and cannot be understood as indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, unless otherwise specified, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; the meaning of "multiple" is two or more. The term "include" and any variation thereof means non-exclusive inclusion, and one or more other features, integers, steps, operations, units, components and / or combinations thereof may be present or added.

[0059] In addition, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or a connection between two components. All technical and scientific terms used in this specification have the same meaning as those generally understood by technicians in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more related listed items.

[0060] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0061] For ease of understanding, the specific process of the embodiment of the present invention is described below. Figure 1 The first embodiment of a method for preparing a multi-layer structure having light-transmitting and invisible properties in an embodiment of the present invention comprises:

[0062] S1. providing a transparent carrier film, and coating a layer of transparent liquid coating on one side of the transparent carrier film;

[0063] In this step, the transparent carrier film is a thin film material with high transparency that can be used for decoration. The thin film material can be PET (polyethylene terephthalate) or PC (polycarbonate). The transparent carrier film is used to support and carry the liquid coating. First, prepare a light-transmitting carrier film, and then apply a layer of transparent liquid coating on a surface of the transparent carrier film. Of course, the liquid coating can also be applied on a releasable film through release technology, and a multi-layer structure is formed after the subsequent process is completed. The releasable film is then peeled off, and then the multi-layer structure of the peeled releasable film is transferred to metal, plastic, glass, glass fiber, carbon fiber, aramid fiber, bamboo fiber, wood, leather, PU leather or silicone leather through a transfer process, so that the multi-layer structure is applicable to a wider range of substrate materials.

[0064] S2, providing a transfer mold with a preset protrusion, pressing the protrusion of the transfer mold onto the liquid coating, and curing the liquid coating, and peeling off the transfer mold after curing, so that the cured liquid coating forms a depression that matches the shape of the protrusion, thereby obtaining a concave perspective layer;

[0065] In this step, the arrangement, shape, size and depth of the protrusions of the transfer mold can be designed one by one according to the actual display effect. First, it is determined whether it is installed on the screen or on the LED light source. Then, according to the final display effect, the specific arrangement, size, shape and depth of the protrusions are determined. After the determination, the protrusions are set by UV lithography or machining technology to form a transfer mold with protrusions. Then, the protrusions of the transfer mold are pressed onto the liquid coating. Since the liquid coating is in a liquid state, the transfer mold can be easily pressed into the liquid coating. After being pressed to a preset depth, the transfer mold is baked by UV. The liquid coating is baked and solidified, and after the liquid coating is solidified, the transfer mold in the liquid coating is peeled off. After peeling, the solidified liquid coating forms a depression, and the arrangement, shape, size and depth of the depression are all adapted to the protrusion, that is, the depression and the protrusion are a matching concave-convex structure to obtain a depression perspective layer, and the depression perspective layer has depressions of the same arrangement, shape, size and depth by transferring the arrangement, shape, size and depth of the protrusions of the transfer mold to the depression perspective layer. The process is simple and efficient, and the design of the protrusion can be optimized according to actual conditions to achieve better display effects.

[0066] S3, printing a light shielding layer on a surface other than the depression on a side of the depression perspective layer away from the transparent carrier film by a flat printing process, so that the light shielding layer has a first through hole connected to the depression at a position corresponding to the depression;

[0067] In this step, the principle of lithographic printing is to use the immiscible characteristics of water and oil to establish an oleophilic and hydrophobic image area and a hydrophilic and oleophobic blank area on the surface of the printing plate, and print by the principle of oil and water repelling each other, and the lithographic printing process has the advantages of fast printing speed, high printing quality, and low printing cost. The light-shielding layer is used for lightproofing, and the light-shielding layer can be black ink or white ink, which can be stacked by multiple printings to further reduce the transmittance; because the lithographic printing process is to make the surface of the concave perspective layer away from the transparent carrier film contact with the rubber cloth and then transfer the ink from the rubber cloth to the surface of the concave perspective layer away from the transparent carrier film through pressure, so that the surface of the concave perspective layer with the concave is in contact with the rubber cloth after the plane part has contact and pressure, and the concave has no contact and no pressure, so that the concave is not covered and filled with ink, and at the same time, the position of the shading layer corresponding to the concave is not covered by ink, so a first through hole connected to the concave is formed.

[0068] Specifically, the shading layer is made through the following 6 steps of flat-plate printing process, first, plate making, transferring the preset graphic information to the printing plate through photography, electronic color separation and other technologies, and the printing plate is usually made of aluminum plate, zinc plate and other materials, and the surface is treated to form oleophilic and hydrophobic graphic areas and hydrophilic and oleophobic blank areas; inking: applying ink to the graphic area of ​​the printing plate so that the graphic area absorbs ink; wetting: wetting the blank area of ​​the printing plate with a wetting liquid to form a layer of water film in the blank area; transfer: covering the printing plate with a rubber cloth so that the rubber cloth contacts the printing plate, thereby transferring the ink from the printing plate to the rubber cloth; printing: contacting the ink-bearing side of the rubber cloth with the surface of the recessed perspective layer away from the transparent carrier film, and under the action of pressure, the ink is transferred from the rubber cloth to the surface of the recessed perspective layer to complete the graphic printing of the shading layer; drying: drying the ink on the recessed perspective layer to fix it on the recessed perspective layer to form a shading layer. Printing the light-shielding layer through the flat-plate printing process not only increases the printing speed and improves production efficiency, but also ensures high printing quality and low printing cost.

[0069] The distance between two adjacent depressions is 0.05 to 0.2 mm.

[0070] S4, printing a decorative layer on a surface of the light-shielding layer on a side away from the transparent carrier film except for the first through hole by a flat printing process, so that a second through hole connected to the first through hole is provided at a position of the decorative layer corresponding to the first through hole, and the second through hole is connected to the recess through the first through hole to form a light-transmitting hole, thereby obtaining a multi-layer structure;

[0071] In this step, the decorative layer is made through the following 6 steps of the flat printing process. First, plate making: transferring the preset graphic information to the printing plate through photography, electronic color separation and other technologies. The printing plate is usually made of aluminum plate, zinc plate and other materials, and the surface is treated to form oleophilic and hydrophobic graphic areas and hydrophilic and oleophobic blank areas; inking: applying ink to the graphic area of ​​the printing plate so that the graphic area absorbs the ink; wetting: wetting the blank area of ​​the printing plate with a wetting liquid so that a layer of water film is formed in the blank area; transferring: covering the printing plate with a rubber blanket so that the rubber blanket contacts the printing plate, thereby transferring the ink from the printing plate to the rubber blanket; printing: contacting the ink-bearing side of the rubber blanket with the surface of the light-shielding layer away from the transparent carrier film. Under the action of pressure, the ink is transferred from the rubber blanket to the surface of the light-shielding layer to complete the graphic printing of the decorative layer; drying: drying the ink on the light-shielding layer to fix it on the light-shielding layer to form a decorative layer.

[0072] Since the position of the decorative layer corresponding to the first through hole of the light-shielding layer is a recessed area, when the ink is transferred, the recessed area does not contact the ink and is not subjected to force, so that the position of the decorative layer corresponding to the first through hole is not covered by ink, thereby forming a second through hole connected to the first through hole, and the recess, the first through hole and the through hole are connected to form a light-transmitting hole, so that when the power is turned on, light can pass through the light-transmitting hole. Printing the decorative layer through the flat printing process not only has a fast printing speed and improves production efficiency, but also has high printing quality and low printing cost.

[0073] Among them, the diameter range of the light-transmitting hole is 0.01 to 0.1 mm, so that the light-transmitting hole is small. When there is no light source, the opaque area of ​​the pattern on the decorative layer is reflected to the human eye under the irradiation of light, but the light-transmitting hole is small and cannot be seen by the naked eye, so that the complete pattern on the decorative layer can be seen; when there is a light source, the light is transmitted through the light-transmitting hole, and the light source or the content displayed on the screen can be seen, but the pattern of the decorative layer cannot be seen because it is opaque, thereby achieving a light-transmitting invisible effect.

[0074] In this embodiment, the arrangement, shape, size and depth of the protrusions of the transfer mold are transferred to the recessed perspective layer by transfer, so that the recessed perspective layer has recesses with the same arrangement, shape, size and depth. The process is simple, the cost is low and the efficiency is high. The design of the protrusions can also be optimized according to actual conditions, so that the recesses have better light transmission effect, and thus the display effect is better. The shading layer and the decorative layer are sequentially arranged on the recessed light-transmitting layer by the flat printing process. Since the ink does not contact the recess during printing, the recess is not covered and filled with ink, so that the shading layer has a first through hole connected to the recess at a position corresponding to the recess, and the decorative layer has a second through hole connected to the first through hole at a position corresponding to the first through hole, so as to form a light-transmitting hole, so that the multi-layer structure can see the light source or display the screen content when the light source is on. When the light source is not on, the light-transmitting hole is not light-transmitting, and the pattern on the decorative layer is displayed at this time. The flat printing process has low cost, high efficiency and simple process.

[0075] See also Figure 2 As shown, the present invention also discloses a second embodiment of a method for preparing a multilayer structure having light-transmitting and invisible properties:

[0076] S10, providing a transparent carrier film, and coating a layer of transparent liquid coating on one side of the transparent carrier film;

[0077] In this step, the description of the above step S10 refers to S1 of the first embodiment, and this step will not be described in detail.

[0078] S11, providing a transfer mold with a preset protrusion, pressing the protrusion of the transfer mold onto the liquid coating, and curing the liquid coating, and peeling off the transfer mold after curing, so that the cured liquid coating forms a depression that matches the shape of the protrusion, thereby obtaining a concave perspective layer;

[0079] In this step, the description of the above step S11 refers to S2 of the first embodiment, and this step will not be described in detail.

[0080] The step of providing a transfer mold with a preset protrusion in step S11 includes:

[0081] The protrusions are arranged in plurality, and the transfer mold with the protrusions is obtained by mechanical processing according to the preset arrangement and size of the protrusions. The arrangement of the protrusions is one or more of an equilateral triangle grid arrangement, a square grid arrangement or a honeycomb grid arrangement.

[0082] In this step, the number of protrusions is determined according to the light transmission needs of the multilayer structure, and the specific arrangement mode, specific value of size, specific shape and specific value of depth of equilateral triangle grid arrangement, square grid arrangement or honeycomb grid arrangement are determined according to the light source of the multilayer structure, so that the light transmission effect of the prepared depression is most suitable for the light source to achieve the best display effect. The protrusions can be made by UV lithography or machining. In addition, the present application forms depressions on the depression perspective layer by a transfer process, so the arrangement mode, size, shape and depth of the protrusions determine the arrangement mode, size, shape and depth of the depressions. Among them, the light source of the multilayer structure can be a screen or an LED light source.

[0083] Since the arrangement of the light-transmitting holes is designed to be combined with the arrangement of the light sources of the multi-layer structure to reduce the generation of moiré or interference, and to make the lighting effect or screen display effect better, the actual production process can be arranged according to the actual arrangement of the light sources of the multi-layer structure, and is not limited to an equilateral triangle grid arrangement, a square grid arrangement or a honeycomb grid arrangement.

[0084] At the same time, the size and arrangement of the light-transmitting array holes can be adjusted within a certain range as needed to change the true light transmittance, and optical textures can be added to the concave inner surface of the light-transmitting holes to further change the light penetration effect, so that the light-transmitting effect of the light-transmitting holes of the present application is better than that of traditional light-transmitting holes processed by punching or screen printing.

[0085] When the light source of the multi-layer structure is an LED light source, the light guide plate principle can also be used to design the arrangement, size and depth of the recesses so that the light is evenly diffused and has the function of a light guide plate.

[0086] Specifically, the light guide plate uses optical-grade acrylic / PC sheets, and then uses high-tech materials with extremely high reflectivity and no light absorption to print light guide points on the bottom of the optical-grade acrylic sheet using laser engraving, V-shaped cross grid engraving, and UV screen printing technology. Its principle is mainly to use the principle of total reflection of light at the interface of the transparent plate and the light scattering theorem to deflect the light incident from the end face by 90° and emit it from the front, thereby playing the role of functional light guide. When the light hits each light guide point, the reflected light will diffuse to various angles, and then destroy the reflection conditions and emit from the front of the light guide plate. Through various light guide points of different densities and sizes, the light guide plate can emit light evenly. The purpose of the reflective sheet is to reflect the light exposed on the bottom surface back into the light guide plate to improve the efficiency of light use; under the condition of equal area luminous brightness, the luminous efficiency is high and the power consumption is low. When designing the recess array, the recess is designed with an optical texture, so that the incident light passes through the texture in the recess point and diffuses the light to various angles, making the light softer and more uniform.

[0087] S12, providing a printing plate with preset graphic information, and applying ink on a side of the printing plate with the graphic information;

[0088] The steps of S12 include:

[0089] 1) transferring the preset graphic information to the printing plate by photography or electronic color separation, wherein the printing plate has an oleophilic and hydrophobic graphic area and a hydrophilic and oleophobic blank area, wherein the first graphic information includes one or more of a pattern or text;

[0090] 2) applying ink on the image area of ​​the printing plate so that the image area absorbs the ink;

[0091] 3) Wetting the blank area of ​​the printing plate with a dampening liquid to form a water film on the blank area.

[0092] In this step, first, determine the style of the graphics to be printed. The graphic style can be just a pattern or a combination of a pattern and text. Then, transfer the designed graphic style to the printing plate by taking a photo or electronic color separation. The printing plate is usually made of aluminum plate, zinc plate and other materials. The surface is treated to form an oleophilic and hydrophobic graphic area and a hydrophilic and oleophobic blank area. Then, ink is applied to the printed graphic area so that the graphic area absorbs the ink, and the blank area of ​​the printing plate is wetted by a wetting liquid so that a layer of water film is formed in the blank area. Then, printing is performed based on the principle of oil-water repulsion.

[0093] S13, transferring the ink to a rubber blanket;

[0094] In this step, the ink is transferred from the printing plate to the rubber blanket through the contact between the rubber blanket and the ink on the printing plate. The operation is simple and the cost is low.

[0095] The steps of S13 include:

[0096] A rubber blanket is covered on the ink surface of the printing plate so that the ink on the printing plate is transferred from the printing plate to the rubber blanket.

[0097] In this step, the rubber blanket is covered on the ink surface of the printing plate so that the rubber blanket contacts the ink on the printing plate, thereby transferring the ink on the printing plate from the printing plate to the rubber blanket. The operation is simple and the cost is low.

[0098] S14, covering the side of the rubber blanket having the ink on the side of the recessed perspective layer away from the transparent supporting film, and applying pressure so that the ink is transferred from the rubber blanket to the surface of the recessed perspective layer except the recess, to form the shading layer having the first through hole.

[0099] In this step, the side of the rubber blanket with ink is covered on the surface of the concave perspective layer away from the transparent carrier film, and the surface of the concave perspective layer away from the transparent carrier film is the surface of the concave perspective layer with a concave, so that the ink directly contacts the plane of the concave perspective layer with the concave surface, but does not contact the concave, because the concave is lower than the plane. When pressure is applied to the rubber blanket, the pressure acts on the plane of the concave perspective layer, so that the ink is transferred from the rubber blanket to the plane of the concave perspective layer to form a light-shielding layer. However, since the concave is lower than the plane, the pressure cannot act on the concave, so the concave is not filled and covered by ink, so that the first through hole is formed at the position of the concave in the light-shielding layer. Because flat printing is to transfer the ink from the rubber blanket to the printing sheet through pressure after the printing sheet and the rubber blanket are in contact, the concave position is not filled with ink by setting a concave on the printing surface, and finally the method of forming a light-transmitting hole is not only simple to operate, low cost, but also high production efficiency.

[0100] S15, printing a decorative layer on a surface of the light-shielding layer on a side away from the transparent carrier film except for the first through hole by a flat printing process, so that a second through hole connected to the first through hole is provided at a position of the decorative layer corresponding to the first through hole, and the second through hole is connected to the recess through the first through hole to form a light-transmitting hole;

[0101] In this step, the description of the above step S15 refers to S4 of the first embodiment, and this step will not be described in detail.

[0102] Step S15 includes:

[0103] The decorative layer comprises a pattern layer and a supporting layer, and the supporting layer is arranged on a side of the light shielding layer away from the transparent supporting film;

[0104] A pattern layer is arranged on a side of the supporting layer away from the light shielding layer.

[0105] In this step, since the color of the pattern layer printed by flat printing is relatively transparent, a white backing layer needs to be printed to enhance and reflect the color of the pattern layer so that the pattern is displayed more clearly. The decorative layer includes a pattern layer and a backing layer. The backing layer is printed on the surface of the light-shielding layer away from the transparent carrier film by a flat printing process. The backing layer is used to enhance and reflect the color of the pattern layer. The pattern layer is printed on the surface of the backing layer away from the light-shielding layer by a flat printing process. The pattern layer makes the appearance of the multi-layer structure richer and more dazzling.

[0106] S16, disposing a filling layer on a side of the decoration layer away from the transparent supporting film and in the light-transmitting hole, and the filling layer fills the light-transmitting hole.

[0107] In this step, a filling layer is formed on the surface of the decorative layer away from the transparent carrier film and in the light-transmitting hole through a transfer process or a coating process. The filling layer is a transparent or translucent material, such as UV glue, epoxy resin, polyurethane or acrylate. After filling, it not only makes the multi-layer structure smoother and more beautiful, but also protects the decorative layer from being damaged. The filling layer can be filled or not according to actual conditions.

[0108] S17, providing an adhesive layer on a side of the filling layer away from the transparent carrier film;

[0109] In this step, the adhesive layer can be adhesive backing, which can be UV glue or a transparent sticky material. The adhesive backing is pasted on the surface of the filling layer away from the transparent carrier film. The adhesive backing is used to adhere the multi-layer structure of the light source, glass or transparent injection molded parts.

[0110] S18, disposing a light source of the multilayer structure on a side of the transparent carrier film away from the adhesive layer;

[0111] In this step, glass or transparent injection-molded parts are pasted on the adhesive layer, and then a light source of the multi-layer structure is arranged on the side of the transparent carrier film away from the adhesive layer, so that the multi-layer structure can emit light, and the light is emitted through the light-transmitting hole, so that the user can see the light source or the content displayed on the screen; in addition to being pasted on the multi-layer structure through the adhesive layer, the light source of the multi-layer structure can also be arranged on the multi-layer structure in other ways, and it does not necessarily require an adhesive layer for pasting. For example, when a transparent frame is pasted on the side of the adhesive layer away from the transparent carrier film, the transparent frame and the light source of the multi-layer structure are in an assembled relationship. At this time, there is no need to set an adhesive layer between the light source of the multi-layer structure and the transparent carrier film.

[0112] like Figure 3 As shown, Figure 3The multilayer structure 100 is made by the preparation method of this embodiment. Specifically, the multilayer structure 100 includes a transparent carrier film 10, a recessed perspective layer 20, a light-shielding layer 40, a supporting layer 303 and a pattern layer 302 stacked in sequence from bottom to top, and the recessed perspective layer 20 is provided with a plurality of array-arranged recesses 201, the light-shielding layer 40 is provided with a first through hole 401 connected to the recess 201 at a position corresponding to the recess 201, and the supporting layer 303 and the pattern layer 302 are provided with a second through hole 301 connected to the first through hole 401 at a position corresponding to the first through hole 401, and the recess 201, the first through hole 401 and the second through hole 301 are sequentially connected to each other to form a light-transmitting hole 80. The multilayer structure 100 also includes a filling layer 50, an adhesive layer 60, A light source, glass or transparent injection molded part of a multi-layer structure, a filling layer 50 is arranged on the side of the pattern layer 302 away from the transparent carrier film 10, and the filling layer 50 fills the light-transmitting hole 80, the adhesive layer 60 is arranged on the side of the filling layer 50 away from the transparent carrier film 10, the glass or transparent injection molded part is arranged on the side of the adhesive layer away from the transparent carrier film 10, and the light source of the multi-layer structure is arranged on the side of the transparent carrier film 10 away from the adhesive layer, wherein the supporting layer 303 and the pattern layer 302 are combined into a decorative layer 30. The multi-layer structure 100 in this embodiment can also choose not to fill the filling layer 50 according to actual conditions. Since the aperture of the light-transmitting hole 80 is too small to be recognized by the human eye, the adhesive layer 60 can also be firmly adhered without filling the filling layer 50.

[0113] In another embodiment, Figure 4 As shown, step S17 can be set to "disposing an adhesive layer on the side of the transparent carrier film away from the filling layer"; step S18 can be set to "disposing a light source of the multilayer structure on the side of the adhesive layer away from the filling layer".

[0114] In this step, the adhesive layer may be a backing glue, which may be UV glue or a transparent sticky material. The adhesive layer is pasted on the surface of the transparent carrier film away from the filling layer, and then the light source of the multi-layer structure is pasted on the adhesive layer, so that the multi-layer structure can emit light, and the light is emitted through the light-transmitting hole, so that the user can see the light source or the content displayed on the screen.

[0115] Figure 4The multilayer structure 100 is made by the preparation method of this embodiment. Specifically, the multilayer structure 100 includes a light source, a backing glue, a transparent carrier film 10, a recessed perspective layer 20, a light shielding layer 40, a supporting layer 303 and a pattern layer 302, which are stacked in sequence from bottom to top. The recessed perspective layer 20 is provided with a plurality of recesses 201 arranged in an array, the light shielding layer 40 is provided with a first through hole 401 connected to the recess 201 at a position corresponding to the recess 201, and the supporting layer 303 and the pattern layer 302 are both provided with a first through hole 401 connected to the first through hole 401 at a position corresponding to the first through hole 401. The second through hole 301, the depression 201, the first through hole 401 and the second through hole 301 are connected to each other in sequence to form a light-transmitting hole 80. The multilayer structure 100 also includes a filling layer 50. The filling layer 50 is arranged on the side of the pattern layer 302 away from the transparent carrier film 10, and the filling layer 50 fills the light-transmitting hole 80. The bottom layer 303 and the pattern layer 302 are combined into a decorative layer 30. The multilayer structure in this embodiment can choose not to fill the filling layer according to actual conditions. Since the aperture of the light-transmitting hole is too small to be recognized by the human eye, the adhesive layer can also be firmly adhered without filling the filling layer.

[0116] In this embodiment, the arrangement, shape, size and depth of the protrusions of the transfer mold are transferred to the recessed perspective layer by transfer, so that the recessed perspective layer has recesses with the same arrangement, shape, size and depth. The process is simple, the cost is low and the efficiency is high. The design of the protrusions can also be optimized according to actual conditions, so that the recesses have better light transmission effect, and thus the display effect is better. The shading layer and the decorative layer are sequentially arranged on the recessed light-transmitting layer by the flat printing process. Since the ink does not contact the recess during printing, the recess is not covered and filled with ink, so that the shading layer has a first through hole connected to the recess at a position corresponding to the recess, and the decorative layer has a second through hole connected to the first through hole at a position corresponding to the first through hole, so as to form a light-transmitting hole, so that the multi-layer structure can see the light source or display the screen content when the light source is on. When the light source is not on, the light-transmitting hole is not light-transmitting, and the pattern on the decorative layer is displayed at this time. The flat printing process has low cost, high efficiency and simple process.

[0117] See also Figure 5 As shown, the present invention also discloses a third embodiment of a method for preparing a multi-layer structure having light-transmitting and invisible properties:

[0118] S20, providing a transparent carrier film, and coating a layer of transparent liquid coating on one side of the transparent carrier film;

[0119] In this step, the description of the above step S20 refers to S1 of the first embodiment, and this step will not be described in detail.

[0120] S21, providing a transfer mold with a preset protrusion, pressing the protrusion of the transfer mold onto the liquid coating, and curing the liquid coating, and peeling off the transfer mold after curing, so that the cured liquid coating forms a depression that matches the shape of the protrusion, thereby obtaining a concave perspective layer;

[0121] In this step, the description of the above step S21 refers to S2 of the first embodiment, and this step will not be described in detail.

[0122] S22, printing a decorative layer on a surface other than the recess on a side of the recessed perspective layer away from the transparent carrier film by a flat printing process, so that the decorative layer has a second through hole communicating with the recess at a position corresponding to the recess;

[0123] In this step, the decorative layer is made by the following 6 steps of the flat printing process. First, plate making: transferring the preset graphic information to the printing plate through photography, electronic color separation and other technologies. The printing plate is usually made of aluminum plate, zinc plate and other materials, and the surface is treated to form an oleophilic and hydrophobic graphic area and a hydrophilic and oleophobic blank area; inking: applying ink to the graphic area of ​​the printing plate so that the graphic area absorbs the ink; wetting: wetting the blank area of ​​the printing plate with a wetting liquid so that a layer of water film is formed in the blank area; transferring: covering the printing plate with a rubber cloth so that the rubber cloth contacts the printing plate, thereby transferring the ink from the printing plate to the rubber cloth; printing: contacting the ink-bearing side of the rubber cloth with the surface of the recessed transparent layer away from the transparent carrier film. Under the action of pressure, the ink is transferred from the rubber cloth to the plane of the recessed surface of the recessed perspective layer to complete the graphic printing of the decorative layer; drying: drying the ink on the recessed perspective layer to fix it on the recessed perspective layer to form a decorative layer.

[0124] Since the position of the decorative layer corresponding to the depression of the depression perspective layer is a depression area, when the ink is transferred, the depression area does not contact the ink and is not subjected to force, so that the position of the decorative layer corresponding to the depression is not covered by ink, thereby forming a second through hole connected to the depression. Printing the decorative layer by flat printing technology not only has a fast printing speed and improves production efficiency, but also has high printing quality and low printing cost.

[0125] Step S22 includes:

[0126] 1) The decorative layer includes a pattern layer and a supporting layer, and the pattern layer is arranged on a side of the recessed perspective layer away from the transparent carrier film;

[0127] 2) A supporting layer is provided on the side of the pattern layer away from the recessed perspective layer

[0128] In this step, since the color of the pattern layer printed by flat printing is relatively transparent, a white backing layer needs to be printed to enhance and reflect the color of the pattern layer so that the pattern is displayed more clearly. The decorative layer includes a pattern layer and a backing layer. The pattern layer is printed on the surface of the recessed perspective layer away from the transparent carrier film by a flat printing process. The pattern layer makes the appearance of the multi-layer structure richer and more gorgeous. The backing layer is printed on the surface of the pattern layer away from the recessed perspective layer by a flat printing process. The backing layer is used to enhance and reflect the color of the pattern layer.

[0129] S23, printing a light shielding layer on a surface of the decorative layer on a side away from the transparent carrier film except for the second through hole by a flat printing process, so that a first through hole connected to the second through hole is provided at a position of the light shielding layer corresponding to the second through hole, and the first through hole is connected to the recess through the second through hole to form a light-transmitting hole;

[0130] In this step, the shading layer is made by the following 6 steps of the flat printing process: first, plate making, transferring the preset graphic information to the printing plate through photography, electronic color separation and other technologies, and the printing plate is usually made of aluminum plate, zinc plate and other materials, and the surface is treated to form an oleophilic and hydrophobic graphic area and a hydrophilic and oleophobic blank area; inking: applying ink to the graphic area of ​​the printing plate so that the graphic area absorbs the ink; wetting: wetting the blank area of ​​the printing plate with a wetting liquid so that a layer of water film is formed in the blank area; transferring: covering the printing plate with a rubber blanket so that the rubber blanket contacts the printing plate, thereby transferring the ink from the printing plate to the rubber blanket; printing: contacting the side of the rubber blanket with ink with the surface of the decorative layer away from the transparent carrier film, under the action of pressure, the ink is transferred from the rubber blanket to the surface of the decorative layer, completing the graphic printing of the shading layer; drying: drying the ink on the decorative layer so that it is fixed on the decorative layer to form a shading layer. Printing the shading layer by the flat printing process not only has a fast printing speed and improves production efficiency, but also has high printing quality and low printing cost. Since the position of the second through hole of the decorative layer corresponding to the light-shielding layer is a recessed area, when the ink is transferred, the recessed area does not contact the ink and is not subjected to any force, so that the position of the light-shielding layer corresponding to the first through hole is not covered by ink, thereby forming a first through hole connected to the second through hole, and the recess, the first through hole and the through hole are connected to form a light-transmitting hole, so that when the power is turned on, light can pass through the light-transmitting hole.

[0131] S24, disposing a filling layer on a side of the light-shielding layer away from the transparent supporting film and in the light-transmitting hole, and the filling layer fills the light-transmitting hole.

[0132] In this step, the description of the above step S24 refers to S16 of the first embodiment, and this step will not be repeated, and the filling layer can be selected or not filled according to the actual situation. Since the aperture of the light-transmitting hole is too small to be recognized by the human eye, the adhesive layer can also be firmly adhered without filling the filling layer.

[0133] S25, disposing an adhesive layer on a side of the transparent carrier film away from the filling layer;

[0134] In this step, the adhesive layer may be adhesive backing, which is applied to the surface of the transparent carrier film away from the filling layer. The adhesive backing is used to adhere the light source, glass or transparent injection molded part of the multi-layer structure.

[0135] S26, arranging a light source of the multilayer structure on a side of the filling layer away from the adhesive layer.

[0136] In this step, glass or transparent injection molding parts are pasted on the adhesive layer, and then a light source of the multi-layer structure is arranged on the side of the filling layer away from the adhesive layer, so that the multi-layer structure can emit light, and the light is emitted through the light-transmitting hole, so that the user can see the light source or the content displayed on the screen; in addition to being pasted on the multi-layer structure through the adhesive layer, the light source of the multi-layer structure can also be arranged on the multi-layer structure in other ways, and it does not necessarily require an adhesive layer for pasting. For example, when a transparent frame is pasted on the side of the adhesive layer away from the transparent supporting film, the transparent frame and the light source of the multi-layer structure are in an assembled relationship. At this time, there is no need to set an adhesive layer between the light source of the multi-layer structure and the transparent supporting film.

[0137] like Figure 6 As shown, Figure 6 The multilayer structure 100 is made by the preparation method of this embodiment. Specifically, the multilayer structure 100 includes a light source, a filling layer 50, a shading layer 40, a supporting layer 303, a pattern layer 302, a recessed perspective layer 20, a transparent carrier film 10 and an adhesive layer 60 of a multilayer structure stacked in sequence from top to bottom, and the recessed perspective layer 20 is provided with a plurality of array-arranged recesses 201, the pattern layer 302 and the supporting layer 303 are provided with second through holes 301 connected to the recesses 201 at positions corresponding to the recesses 201, the shading layer 40 is provided with first through holes 401 connected to the second through holes 301 at positions corresponding to the second through holes 301, the recesses 201, the first through holes 401 and the second through holes 301 are sequentially interconnected to form a light-transmitting hole 80, wherein the supporting layer 303 and the pattern layer 302 are combined into a decorative layer 30.

[0138] In another embodiment, Figure 7 As shown, step S25 may be set to "disposing a surface treatment layer on a side of the transparent carrier film away from the filling layer".

[0139] In this step, a surface treatment layer is coated on the surface of the transparent carrier film away from the filling layer through a spray coating process. The surface treatment layer improves the hardness and wear resistance of the multi-layer structure. Glass or transparent injection molding parts can also be arranged on the surface of the surface treatment layer away from the transparent carrier film.

[0140] Step S26 is set to "arrange an adhesive layer on a side of the filling layer away from the surface treatment layer". "Arrange a light source of the multilayer structure on a side of the adhesive layer away from the filling layer" may also be added after this step.

[0141] In this step, an adhesive layer is attached to the surface of the filling layer away from the surface treatment layer, and then a light source of the multi-layer structure is attached to the adhesive layer, so that the multi-layer structure can emit light, and the light is emitted through the light-transmitting hole, so that the user can see the light source or the content displayed on the screen. When the light source of the multi-layer structure is turned off, only the pattern on the decorative layer can be seen, and because the light-transmitting hole is small, the light-transmitting hole cannot be observed by naked eyes, which affects the beauty of the multi-layer structure.

[0142] Figure 7 The multilayer structure 100 is made by the preparation method of this embodiment. Specifically, the multilayer structure 100 includes a surface treatment layer 70, a transparent carrier film 10, a recessed perspective layer 20, a pattern layer 302, a supporting layer 303 and a light shielding layer 40 stacked in sequence from top to bottom, and the recessed perspective layer 20 is provided with a plurality of array-arranged recesses 201, the pattern layer 302 and the supporting layer 303 are provided with second through holes 301 connected to the recesses 201 at positions corresponding to the recesses 201, and the light shielding layer 40 is provided with first through holes 40 connected to the second through holes 301 at positions corresponding to the second through holes 301 01, the recess 201, the first through hole 401 and the second through hole 301 are interconnected in sequence to form a light-transmitting hole 80, the multi-layer structure 100 also includes a filling layer 50, an adhesive layer 60 and a light source of the multi-layer structure, the filling layer 50 is arranged on the side of the light-shielding layer 40 away from the transparent carrier film 10, and the filling layer 50 fills the light-transmitting hole 80, the adhesive layer 60 is arranged on the side of the filling layer 50 away from the transparent carrier film 10, and the light source of the multi-layer structure is arranged on the side of the adhesive layer 60 away from the transparent carrier film 10, wherein the supporting layer 303 and the pattern layer 302 are combined into the decorative layer 30.

[0143] In this embodiment, the arrangement, shape, size and depth of the protrusions of the transfer mold are transferred to the recessed perspective layer by transfer, so that the recessed perspective layer has recesses with the same arrangement, shape, size and depth. The process is simple, the cost is low and the efficiency is high. The design of the protrusions can also be optimized according to actual conditions, so that the recesses have better light transmission effect, and thus the display effect is better. The shading layer and the decorative layer are sequentially arranged on the recessed light-transmitting layer by the flat printing process. Since the ink does not contact the recess during printing, the recess is not covered and filled with ink, so that the shading layer has a first through hole connected to the recess at a position corresponding to the recess, and the decorative layer has a second through hole connected to the first through hole at a position corresponding to the first through hole, so as to form a light-transmitting hole, so that the multi-layer structure can see the light source or display the screen content when the light source is on. When the light source is not on, the light-transmitting hole is not light-transmitting, and the pattern on the decorative layer is displayed at this time. The flat printing process has low cost, high efficiency and simple process.

[0144] An embodiment of the present invention also discloses a multi-layer structure with light transmission and invisibility. The multi-layer structure is made by the preparation method of any of the above embodiments. The multi-layer structure not only has good light transmission effect, but also has low production cost and high production efficiency.

[0145] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may also be combined, the steps may be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Although the present invention has been described in detail with reference to the above embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the above embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing a multilayer structure having light-transmitting and invisible properties, characterized in that: The preparation method comprises: Providing a transparent carrier film, and coating a transparent liquid coating on one side of the transparent carrier film; Providing a transfer mold with a preset protrusion, pressing the protrusion of the transfer mold onto the liquid coating, and curing the liquid coating, peeling off the transfer mold after curing, so that the cured liquid coating forms a depression that matches the shape of the protrusion, thereby obtaining a concave perspective layer; Printing a light shielding layer on a surface other than the depression on a side of the depression perspective layer away from the transparent carrier film by a flat printing process, so that the light shielding layer has a first through hole communicating with the depression at a position corresponding to the depression; A decorative layer is printed on the surface of the light-shielding layer on the side away from the transparent carrier film except for the first through hole through a flat printing process, so that the decorative layer has a second through hole connected to the first through hole at a position corresponding to the first through hole, and the second through hole is connected to the recess through the first through hole to form a light-transmitting hole, thereby obtaining a multi-layer structure.

2. The preparation method according to claim 1, characterized in that: The step of printing the light shielding layer on the surface of the recessed perspective layer away from the transparent carrier film except the recess by the lithographic printing process is formed in three steps, including: Providing a printing plate with preset graphic information, and applying ink on the side of the printing plate with the graphic information; transferring the ink to a rubber blanket; The side of the rubber blanket having the ink is covered on the side of the recessed perspective layer away from the transparent carrier film, and pressure is applied so that the ink is transferred from the rubber blanket to the surface of the recessed perspective layer except the recess, thereby forming the shading layer having the first through hole.

3. The preparation method according to claim 2, characterized in that: The step of providing a printing plate with preset graphic information and applying ink on the side of the printing plate with the graphic information is formed in three steps, including: The preset graphic information is transferred to the printing plate by photography or electronic color separation, and the printing plate has an oleophilic and hydrophobic graphic area and a hydrophilic and oleophobic blank area, wherein the first graphic information includes one or more of patterns or texts; Applying ink on the image area of ​​the printing plate so that the image area absorbs the ink; The dampening liquid is used to wet the blank area of ​​the printing plate, so that a water film is formed on the blank area.

4. The preparation method according to claim 2, characterized in that: The transferring of the ink to the rubber blanket comprises: A rubber blanket is covered on the ink surface of the printing plate so that the ink on the printing plate is transferred from the printing plate to the rubber blanket.

5. The preparation method according to claim 1, characterized in that: The decorative layer comprises a pattern layer and a supporting layer, and the supporting layer is arranged on a side of the light shielding layer away from the transparent supporting film; A pattern layer is arranged on a side of the supporting layer away from the light shielding layer.

6. The preparation method according to claim 1, characterized in that: The step of providing a transfer mold with a preset protrusion comprises: The protrusions are arranged in plurality, and the transfer mold with the protrusions is obtained by mechanical processing according to the preset arrangement and size of the protrusions. The arrangement of the protrusions is one or more of an equilateral triangle grid arrangement, a square grid arrangement or a honeycomb grid arrangement.

7. The preparation method according to claim 1, characterized in that: After the decorative layer is printed on the surface of the light shielding layer other than the first through hole on the side away from the transparent carrier film by the flat printing process, so that the decorative layer has a second through hole connected to the first through hole at a position corresponding to the first through hole, and the second through hole is connected to the recess through the first through hole to form a light-transmitting hole, and the multi-layer structure is obtained, the method further includes: A filling layer is arranged on a side of the decoration layer away from the transparent supporting film and in the light-transmitting hole, and the filling layer fills the light-transmitting hole.

8. The preparation method according to claim 7, characterized in that: After the step of providing a filling layer on a side of the decorative layer away from the transparent supporting film and in the light-transmitting hole, and the filling layer fills the light-transmitting hole, the method further includes: An adhesive layer is provided on a side of the filling layer away from the transparent carrier film; A light source of the multi-layer structure is arranged on a side of the transparent carrier film away from the adhesive layer; or, Disposing an adhesive layer on a side of the transparent carrier film away from the filling layer; A light source of the multi-layer structure is arranged on a side of the adhesive layer away from the filling layer.

9. A method for preparing a multilayer structure having light-transmitting and invisible properties, characterized in that: The preparation method comprises: Providing a transparent carrier film, and coating a transparent liquid coating on one side of the transparent carrier film; Providing a transfer mold with a preset protrusion, pressing the protrusion of the transfer mold onto the liquid coating, and curing the liquid coating, peeling off the transfer mold after curing, so that the cured liquid coating forms a depression that matches the shape of the protrusion, thereby obtaining a concave perspective layer; Printing a decorative layer on a surface other than the recess on a side of the recessed perspective layer away from the transparent carrier film by a flat printing process, so that the decorative layer has a second through hole communicating with the recess at a position corresponding to the recess; A light-shielding layer is printed on the surface of the decorative layer on the side away from the transparent carrier film except for the second through hole through a flat printing process, so that the position of the light-shielding layer corresponding to the second through hole has a first through hole connected to the second through hole, and the first through hole is connected to the recess through the second through hole to form a light-transmitting hole, thereby obtaining a multi-layer structure.

10. The preparation method according to claim 9, characterized in that: The decorative layer comprises a pattern layer and a supporting layer, and the pattern layer is arranged on a side of the recessed perspective layer away from the transparent carrier film; A supporting layer is arranged on a side of the pattern layer away from the recessed perspective layer.

11. The preparation method according to claim 9, characterized in that: After printing a light shielding layer on a surface of the decorative layer away from the transparent carrier film except for the second through hole by the flat printing process, so that a position of the light shielding layer corresponding to the second through hole has a first through hole connected to the second through hole, and the first through hole is connected to the recess through the second through hole to form a light-transmitting hole, the multi-layer structure further includes: A filling layer is arranged on a side of the light shielding layer away from the transparent supporting film and in the light transmission hole, and the filling layer fills the light transmission hole.

12. The preparation method according to claim 11, characterized in that: The method further comprises: arranging a filling layer on a side of the light shielding layer away from the transparent supporting film and in the light transmission hole, and after the filling layer fills the light transmission hole, the method further comprises: Disposing an adhesive layer on a side of the transparent carrier film away from the filling layer; A light source of the multi-layer structure is arranged on a side of the filling layer away from the adhesive layer.

13. The preparation method according to claim 11, characterized in that: The method further comprises: arranging a filling layer on a side of the light shielding layer away from the transparent supporting film and in the light transmission hole, and after the filling layer fills the light transmission hole, the method further comprises: Disposing a surface treatment layer on a side of the transparent carrier film away from the filling layer; Disposing an adhesive layer on a side of the filling layer away from the surface treatment layer; A light source of the multi-layer structure is arranged on a side of the adhesive layer away from the filling layer.

14. A multi-layer structure having light-transmitting and invisible properties, characterized in that: The multilayer structure is made by the preparation method according to any one of claims 1 to 8.

15. A multi-layer structure having light-transmitting and invisible properties, characterized in that: The multilayer structure is made by the preparation method according to any one of claims 9 to 13.

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