Colorful dynamic thin film as well as preparation method and application thereof

Abstract

The invention provides a color dynamic film and a preparation method and application thereof, and belongs to the technical field of optical imaging. The colored dynamic film provided by the invention comprises a colored micro-pattern layer, a bonding layer and a cylindrical lens array layer which are sequentially laminated, the colorized micro-pattern layer comprises a flexible thin film material and a micro-pattern structure which protrudes out of or sinks into the flexible thin film material; the micro-pattern structure is formed by a two-dimensional hole array structure or a columnar array structure; or the micro-pattern structure is formed by filling three-dimensional colloidal microspheres; a difference exists between the period of the micro-pattern structure and the period of the cylindrical lens array layer. According to the invention, the two-dimensional hole array structure or the columnar array structure is used for rasterizing and filling the micro-pattern, or the three-dimensional colloidal microspheres are used for filling to form a three-dimensional photonic crystal structure, the color effect presented by the formed micro-pattern structure is not limited by an observation visual angle, and obvious colored dynamic patterns can be observed in all directions.

Description

Technical Field

[0001] The invention relates to the technical field of optical imaging, and in particular to a color dynamic film and a preparation method and application thereof. Background Art

[0002] Films with dynamic visual effects are usually realized through special optical structures or material designs. They can show changing visual effects under different viewing angles, lighting conditions or external stimuli. In recent years, films with dynamic effects have gradually developed into one of the dynamic display technologies with potential and prospects due to their low process cost and difficulty in imitation. Among them, dynamic display technology based on microlens or cylindrical lens arrays creates a dynamic and three-dimensional visual experience by controlling the propagation and refraction of light in the lens array. It combines optical, electronic and display technologies and has effects such as naked-eye 3D, viewing angle separation, and brightness and color optimization. However, this technology still has a series of problems in achieving color and dynamic effects.

[0003] For example, the related art discloses a method for preparing an optical thin film structure, in which the method matches a graphic structure and an optical lens structure to form an image that is magnified in one direction. The image is only magnified in one direction, so the optical lens structure only needs to be arranged in one direction. The graphic structure and the optical lens structure do not require a complex matching relationship in all directions, and the process is simple. However, this method has no obvious effect on the colorization of dynamic images.

[0004] For example, the related art discloses an optical imaging film and a preparation method thereof, in which the periodic direction of the line grating is perpendicular to the periodic direction of the cylindrical lens, so that the grating diffraction light-splitting effect will not be destroyed by the convergence effect of the cylindrical lens. When the human eye observes the imaging film, the direction of the line connecting the two eyes should be parallel to the periodic direction of the grating, otherwise the color effect will not be seen. For example, the related art discloses an optical imaging film for anti-counterfeiting, in which the micro-pattern is cut into a line grating with a periodic arrangement, and obvious color changes can only be observed in a specific direction. Summary of the invention

[0005] The purpose of the present invention is to provide a color dynamic film and its preparation method and application. The color dynamic film provided by the present invention has a three-dimensional dynamic change effect. At the same time, the colorization effect of the film is not limited by the observation viewing angle, and obvious color dynamic patterns can be observed in all directions.

[0006] In order to achieve the purpose of the present invention, the present invention provides the following technical solutions:

[0007] A color dynamic film, comprising a colored micro-pattern layer, a bonding layer and a cylindrical lens array layer which are stacked in sequence;

[0008] The colored micro-pattern layer comprises a flexible film material and a micro-pattern protruding from or sunken into the flexible film material;

[0009] The micro-pattern structure is formed by a two-dimensional hole array structure or a columnar array structure; or the micro-pattern structure is formed by filling three-dimensional colloidal microspheres;

[0010] There is a difference between the period of the micro-pattern structure and the period of the cylindrical lens array layer.

[0011] Preferably, the thickness of the colored micro-pattern layer is 0.5-100 μm.

[0012] Preferably, the period of the micro-pattern structure is 30-200 μm.

[0013] Preferably, the three-dimensional colloidal microspheres include one or more of SiO2 microspheres, polystyrene microspheres, polymethyl methacrylate microspheres, Fe3O4 microspheres and carbon microspheres;

[0014] The particle size of the three-dimensional colloidal microspheres is 200-600nm.

[0015] Preferably, the raw material for preparing the flexible thin film material is photoresist and / or varnish.

[0016] Preferably, the thickness of the cylindrical lens array layer is 50-1000 μm.

[0017] Preferably, the period of the cylindrical lenses in the cylindrical lens array layer is 30-200 μm, and the aperture is 20-180 μm; the focal length of the cylindrical lenses is equal to the thickness of the cylindrical lens array layer; and the cylindrical lenses are periodically arranged along the aperture arrangement direction.

[0018] The present invention also provides a method for preparing the color dynamic film described in the above technical solution, comprising the following steps:

[0019] When the micro-pattern is formed by a two-dimensional hole array structure or a columnar array structure, a grid-processed micro-pattern structure is prepared on the surface of the substrate by photolithography; the micro-pattern structure is transferred by a flexible film material to obtain a colored micro-pattern layer;

[0020] When the micro-pattern structure is formed by filling three-dimensional colloidal microspheres, a micro-pattern structure with a protruding effect is designed on the back of the substrate, the micro-pattern structure is transferred using a flexible film material, a groove-shaped micro-pattern structure is obtained on one side of the flexible film material, and three-dimensional colloidal microspheres are filled into the groove-shaped micro-pattern structure to obtain the colored micro-pattern layer;

[0021] The colored micro-pattern layer and the cylindrical lens array layer are bonded together to obtain the colored dynamic film.

[0022] Preferably, the three-dimensional colloidal microspheres are filled by one of blade coating, rod coating and spin coating.

[0023] The present invention also provides the use of the color dynamic film described in the above technical solution or the color dynamic film prepared by the preparation method described in the above technical solution in anti-counterfeiting materials.

[0024] The present invention provides a color dynamic film, comprising a color micro-pattern layer, an adhesive layer and a column lens array layer stacked in sequence; the color micro-pattern layer comprises a flexible film material and a micro-pattern structure protruding or sunken in the flexible film material; the micro-pattern structure is formed by a two-dimensional hole array structure or a columnar array structure; or the micro-pattern structure is formed by filling three-dimensional colloidal microspheres; there is a difference between the period of the micro-pattern structure and the period of the column lens array layer. The type of the micro-pattern structure in the color micro-pattern layer of the present invention is a two-dimensional hole array or a columnar array structure, or a three-dimensional photonic crystal structure is formed by filling three-dimensional colloidal microspheres. The color effects presented by the micro-pattern structures formed by the two methods are not limited by the viewing angle, and obvious color dynamic patterns can be observed in all directions.

[0025] At the same time, the present invention also provides a cylindrical lens array layer, and the cylindrical lenses can realize image magnification in the direction of the arrangement of the cylindrical lens subunits in the vertical cylindrical lens array layer. The image size is not limited in the direction parallel to the arrangement of the cylindrical lens subunits, and the image size in the direction perpendicular to the arrangement of the cylindrical lens subunits needs to be smaller than the cylindrical lens period to ensure that the imaging in the direction perpendicular to the arrangement of the cylindrical lens subunits after magnification is complete, and there is a certain period difference between the micro-pattern structure in the colored micro-pattern layer and the cylindrical lenses in the cylindrical lens layer to ensure the realization of the required magnification. When the micro-pattern structure period is < the cylindrical lens period, a sunken magnified image can be presented, and when the micro-pattern structure period is > the cylindrical lens period, the magnified image presents a floating mirror image.

[0026] In addition, the preparation process of the color dynamic film of the present invention does not require ink filling, the preparation process is environmentally friendly, and the film is not easy to fade; at the same time, the present invention does not require a complicated printing process, the preparation method is simple, and the cost is lower. The accuracy of the pattern in the prepared color dynamic film can reach 1.0μm, which is suitable for anti-counterfeiting films with high anti-counterfeiting levels. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0028] Figure 1 This is a flow chart of the preparation of the color dynamic film of Example 1;

[0029] Figure 2 are the micro-pattern parameters of the color dynamic film in Example 1;

[0030] Figure 3 It is a schematic diagram of the structure of the color dynamic film of the present invention;

[0031] Figure 4 This is a SEM image of the micro-pattern in the color dynamic film of Example 1;

[0032] Figure 5 This is an optical photograph of the color dynamic film of Example 1;

[0033] Figure 6 This is a flow chart of the preparation of the color dynamic film of Example 2;

[0034] Figure 7 are the micro-pattern parameters of the color dynamic film in Example 2;

[0035] Figure 8 are the micro-pattern parameters of the color dynamic film of Comparative Example 1;

[0036] Fig. 9 This is the SEM image of the micro-pattern in the color dynamic film of Comparative Example 1;

[0037] Fig.10 This is an optical photograph of the color dynamic film of Comparative Example 1 when the incident light is perpendicular to the grating direction;

[0038] Fig.11 is an optical photograph of the color dynamic film of comparative example 1 when the incident light is parallel to the grating direction; DETAILED DESCRIPTION

[0039] The present invention provides a color dynamic film, comprising a colorized micro-pattern layer, a bonding layer and a cylindrical lens array layer which are stacked in sequence;

[0040] The colored micro-pattern layer comprises a flexible film material and a micro-pattern structure protruding from or sunken into the flexible film material;

[0041] The micro-pattern structure is formed by a two-dimensional hole array structure or a columnar array structure; or the micro-pattern structure is formed by filling three-dimensional colloidal microspheres;

[0042] There is a difference between the period of the micro-pattern structure and the period of the cylindrical lens array layer.

[0043] In the present invention, the colored micro-pattern layer comprises a flexible film material and a micro-pattern structure protruding from or sunken into the flexible film material; the raw material for preparing the flexible film material is preferably photoresist and / or varnish; the photoresist may be polydimethylsiloxane (PDMS) or a photosensitive resin; the photoresist also preferably comprises a curing agent, and in a specific embodiment, the mass fraction of the curing agent may be 10%, 20% or 30%.

[0044] In the present invention, the micropattern is formed by a two-dimensional hole array structure or a columnar array structure, and the two-dimensional hole array structure can be a periodic triangular arrangement or a quadrilateral arrangement; the diameter of the circular holes in the two-dimensional hole array structure is preferably 100 to 800 nm, and the hole depth is preferably 50 to 1000 nm; in a specific embodiment, the diameter of the circular holes in the two-dimensional hole array can be 200, 300, 500 or 600 nm, the hole depth can be 100, 300, 500 or 800 nm, and the period can be The diameter of the columnar structure is preferably 200nm, 1μm or 3μm; the columnar array structure can be arranged in a triangular pattern or a quadrilateral pattern; the diameter of the columnar structure in the columnar array structure is preferably 100-800nm, and the column height is preferably 100-1500nm; in a specific embodiment, the diameter of the columnar structure can be 200, 300, 500 or 600nm, the column height can be 300, 500, 800 or 1300nm, and the period can be 200nm, 1μm or 3μm.

[0045] In the present invention, when the micropattern is formed by a two-dimensional hole array structure, the two-dimensional hole array structure preferably protrudes from the substrate and is recessed into the flexible film material; when the micropattern is formed by a columnar array structure, the columnar array structure is preferably recessed into the substrate and protrudes from the flexible film material.

[0046] In the present invention, the micro-pattern structure is formed by filling three-dimensional colloidal microspheres; the three-dimensional colloidal microspheres can be SiO 2 Microspheres, polystyrene microspheres, polymethyl methacrylate microspheres, Fe 3 O 4 microspheres or carbon microspheres; the particle size of the three-dimensional colloidal microspheres can be 200nm, 300nm, 450nm, 500nm or 600nm; in a specific embodiment, the three-dimensional colloidal microspheres are preferably used in the form of three-dimensional colloidal microsphere solutions; the solvent of the three-dimensional colloidal microsphere solution is preferably water or ethanol; the volume fraction of the three-dimensional colloidal microspheres can be 10%, 30%, 50% or 70%.

[0047] In a specific embodiment, the thickness of the colored micropattern layer can be 1 μm, 2 μm, 5 μm or 10 μm; the period of the micropattern structure can be 52.3 μm, 124.5 μm, 125.4 μm or 131.2 μm; the proportion of the micropattern structure in the colored micropattern layer can be 76.6%, 79.9%, 77.1% or 66.8%; the arrangement of the micropattern in the micropattern structure can be one of a two-dimensional hole array, a columnar structure and a three-dimensional colloidal crystal microsphere structure; the spacing between each micropattern in the micropattern structure can be set according to the specific size of the enlarged micropattern. In a specific embodiment, the size of the micropattern after enlargement can be 10, 15, 18 or 23 mm, so it is more appropriate to set the spacing to 3 mm. The present invention does not specifically limit the style of the micropattern in the colored micropattern layer. In a specific embodiment, it can be text, numbers or pictures.

[0048] In a specific embodiment, the thickness of the cylindrical lens array layer can be 100μm or 180μm; the period of the cylindrical lenses in the cylindrical lens array layer can be 127μm or 52.9μm, and the aperture can be 65μm or 45μm; the focal length of the cylindrical lenses is equal to the thickness of the cylindrical lens array layer; the arrangement of the cylindrical lenses can be periodic arrangement along the aperture arrangement direction.

[0049] In a specific embodiment, there is a difference between the period of the micro-pattern structure and the period of the cylindrical lenses in the cylindrical lens array layer; the difference may be 1 μm, 3 μm, 5 μm, 8 μm or 10 μm.

[0050] In a specific embodiment, the raw material of the adhesive layer may be double-sided transparent adhesive, varnish or silk-screen glue; the thickness of the adhesive layer may be 80 μm, 90 μm, 100 μm or 110 μm.

[0051] The present invention also provides a method for preparing the color dynamic film described in the above technical solution, comprising the following steps:

[0052] When the micro-pattern structure is formed by a two-dimensional hole array structure or a columnar array structure, a grid-processed micro-pattern structure is prepared on the surface of the substrate by photolithography; the micro-pattern structure is transferred by a flexible film material to obtain a colored micro-pattern layer;

[0053] When the micro-pattern structure is formed by filling three-dimensional colloidal microspheres, a micro-pattern structure with a protruding effect is designed on the back of the substrate, the micro-pattern structure is transferred using a flexible film material, a groove-shaped micro-pattern structure is obtained on one side of the flexible film material, and three-dimensional colloidal microspheres are filled into the groove-shaped micro-pattern structure to obtain the colored micro-pattern layer;

[0054] The colored micro-pattern layer and the cylindrical lens array layer are bonded together to obtain the colored dynamic film.

[0055] In the specific examples, unless otherwise specified, all the raw materials for preparation are commercially available products well known to those skilled in the art.

[0056] In the present invention, when the micro-pattern is formed by a two-dimensional hole array structure or a columnar array structure, a grid-processed micro-pattern structure is prepared by photolithography on the surface of the substrate; the micro-pattern structure is transferred by a flexible film material to obtain a colored micro-pattern layer. In a specific embodiment, the substrate can be a silicon substrate, a glass substrate or a quartz substrate; the thickness of the substrate is not particularly limited. The present invention does not particularly limit the conditions of the photolithography.

[0057] In a specific embodiment, the micropattern is obtained by shrinking the pattern to be presented and then preparing it by photolithography; in a specific embodiment, it can be shrunk to a size smaller than the periodic size of the cylindrical lens; the size of the micropattern is preferably 5 to 20 μm; the difference between the periodic size of the cylindrical lens and the size of the micropattern is preferably in the range of 0.1 to 25 μm.

[0058] In the present invention, when the micro-pattern structure is formed by filling three-dimensional colloidal microspheres, a micro-pattern structure with a protruding effect is designed on the back of the substrate, and the micro-pattern structure is transferred using a flexible film material to obtain a groove-shaped micro-pattern structure on one side of the flexible film material, and the three-dimensional colloidal microspheres are filled into the groove-shaped micro-pattern structure to obtain the colored micro-pattern layer; the depth of the groove in the groove-shaped micro-pattern structure is preferably 1 to 50 μm, and in a specific embodiment, it can be 2 μm, 3 μm, 10 μm or 20 μm; the filling method of the three-dimensional colloidal microspheres can be one of scraping, rod coating and spin coating, and scraping is more preferred; the angle between the scraper and the surface of the flexible film material during scraping is preferably 15 to 60 °, in a specific embodiment, it can be 15°, 35°, 45° or 55°; the scraping rate is preferably 0.01-1 mm / s, in a specific embodiment, it can be 0.05 mm / s, 0.1 mm / s, 0.3 mm / s, 0.5 mm / s or 0.7 mm / s; in a specific embodiment, the scraper height is adjusted to the blade just able to touch the surface of the flexible film material without exerting pressure on the surface of the flexible film material; preferably, 5-10 μL of the three-dimensional colloidal microsphere solution is evenly dripped on the edge of the scraper blade each time to ensure that the microspheres can be evenly filled in the grooved micropattern structure when the scraper moves, in a specific embodiment, it can be 6 μL, 7 μL or 8 μL.

[0059] In the present invention, the transfer preferably includes: coating a flexible thin film material onto the surface of the micro-patterned structure of the substrate and the area not covered by the micro-patterned structure, and separating the substrate and the flexible thin film material after drying. In a specific embodiment, the coating method may be spin coating, blade coating or screen printing; the rotation speed of the spin coating may be 300 r / min, 400 r / min, 500 r / min or 600 r / min; the time may be 1 min, 40 s or 20 s; the drying temperature may be 40 °C, 50 °C or 60 °C.

[0060] After obtaining the colorized micro-patterned layer, the present invention bonds the colorized micro-patterned layer and the lenticular array layer to obtain the color dynamic film. The present invention has no special limitation on the bonding conditions.

[0061] In the present invention, it is preferred that the side with the micro-pattern in the colorized micro-patterned layer is close to the bonding layer during bonding.

[0062] The present invention also provides the application of the color dynamic film described in the above technical solution or the color dynamic film prepared by the preparation method described in the above technical solution in anti-counterfeiting materials.

[0063] In order to further illustrate the present invention, the color dynamic film provided by the present invention, its preparation method and application will be described in detail below with reference to the drawings and embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0064] Example 1

[0065] According to Figure 1 the flowchart shown, the color dynamic film is prepared, and the specific steps are as follows:

[0066] The character group of "Kuanzhai" in boldface is reduced to 0.10 mm along the X-axis direction. The character group is arrayed according to the parameters shown in Table 1 and Figure 1 the following parameters: the center distance of the letters along the X-axis direction is 125.4 μm, the interval along the Y-axis direction is 3 mm, and the cylindrical structure with a line width of 1.0 μm and a period of 2.0 μm is used to fill the characters, obtaining a silicon-based photolithographic plate, and finally achieving the effect of being magnified 80 times after matching with a 200-line lens grating;

[0067] A spin coater (500 r / min) is used to spin coat a layer of PDMS (containing 10 wt.% curing agent) with a thickness of about 36 μm on the surface of the above silicon-based photolithographic plate, and heated at 60 °C to quickly dry the PDMS into a film; the obtained PDMS film is peeled off the photolithographic plate, dried and placed on a blank silicon wafer to obtain a transferred PDMS film anti-generation structure; a 10-μm-thick highly transparent double-sided adhesive is used to bond the PDMS film anti-generation structure and the lenticular lens to obtain a color dynamic film.

[0068] Table 1 Parameters of micro-patterns in the color dynamic film of Example 1

[0069] Character height (mm) Character width (mm) Character center spacing (μm) Line width / period Filling method 18.203 100 125.4 1.0μm / 2.0μm Two-dimensional hole array

[0070] Figure 2 These are the micro-pattern parameters of the colorful dynamic film in Example 1.

[0071] Figure 3 It is a schematic diagram of the structure of the color dynamic film of the present invention.

[0072] Figure 4 is a SEM image of the micro-pattern in the color dynamic film of Example 1, Figure 4 It can be seen that the micro-pattern of the present invention is a regularly arranged triangular micro-structure, so that the micro-pattern has a gorgeous iridescent effect.

[0073] Figure 5 This is an optical photograph of the color dynamic film of Example 1. Figure 5 The results show that the colorful dynamic flexible film prepared by the present invention can present a clear, magnified micro-pattern array with an iridescent effect.

[0074] Example 2

[0075] according to Figure 6 The flowchart shown is used to prepare a color dynamic film, and the specific steps are:

[0076] Reduce the character "2024" to 0.05mm along the X-axis direction, and group the characters according to Figure 4 The parameters shown in the figure and the following parameter arrays are as follows: the center distance of the letters along the X-axis direction is 52.3 μm, the spacing along the Y-axis direction is 3 mm, the depth of the character groove is designed to be 1 μm, and finally the effect of 80 times magnification is achieved after matching with the 480-line lens grating; a PDMS (containing 10 wt.% curing agent) with a thickness of about 36 μm is spin-coated on the surface of the above-mentioned silicon-based photomask by a coating machine (500 r / min), and the PDMS is heated at 50°C to quickly dry the PDMS to form a film; the obtained PDMS film is peeled off the photomask, dried and placed on a blank silicon wafer to obtain a transfer PDMS film inverse structure; next, 10 μL of SiO with a volume fraction of 30% and a particle size of 250 nm is added 2 The colloidal microspheres are filled into the groove-shaped micro-pattern structure to obtain the colored micro-pattern layer; the depth of the groove of the micro-pattern structure is 1 μm, and the colloidal microspheres are applied by scraping, the angle between the scraper and the PDMS surface is set to 45°, the scraper height is adjusted to the blade just touching the PDMS surface, and no pressure is applied to the PDMS surface, and the scraping rate is 0.1 mm / s. Finally, a 10 μm thick high-transparent double-sided tape is used to bond the PDMS film reverse structure and the cylindrical lens to obtain a colored dynamic film.

[0077] Figure 7 These are the micro-pattern parameters of the colorful dynamic film in Example 2.

[0078] Comparative Example 1

[0079] Reduce the "wide and narrow" character group to 0.12mm along the X-axis direction, and the character group is based on Table 2 and Figure 5 The parameters shown and the following parameter arrays: the distance between the centers of the letters along the X-axis is 124.5 μm, the spacing along the Y-axis is 3 mm, and the characters are filled with a one-dimensional grating with a feature width of 1.0 μm, a period of 2.0 μm, and an angle of 30° with the horizontal direction, which ultimately achieves a 50-fold magnification effect after matching with a 200-line lens grating;

[0080] A PDMS (containing 10 wt.% curing agent) with a thickness of about 36 μm was spin-coated on the surface of the silicon-based photomask using a coating machine (500 r / min), and the PDMS was heated at 60°C to quickly dry the PDMS into a film; the obtained PDMS film was peeled off the photomask, dried and placed on a blank silicon wafer to obtain a transferred PDMS film inverse structure; the PDMS film inverse structure and the cylindrical lens were bonded using a 10 μm thick high-transparency double-sided tape to obtain a colorful dynamic film.

[0081] Table 2 Preparation parameters of color dynamic film in comparative example 1

[0082] Character height (mm) Character width (mm) Character center spacing (μm) Line width / period / rotation handover Filling method 14.435 120 124.5 1.0μm / 2.0μm / 30° One-dimensional grating

[0083] Figure 8 These are the micro-pattern parameters of the color dynamic film of Comparative Example 1.

[0084] Fig. 9 is the SEM image of the micro-pattern in the color dynamic film of comparative example 1, Fig. 9 The results show that the one-dimensional grating in Example 1 has obvious orientation. After being regulated by diffraction and reflection of light, it will have a gorgeous iridescent effect only when the light is incident perpendicular to the grating direction, which is limited by the observation angle and the angle of light.

[0085] Fig.10 This is an optical photograph of the color dynamic film of Comparative Example 1 when the incident light is perpendicular to the grating direction. Fig.11 This is an optical photograph of the color dynamic film of comparative example 1 when the incident light is parallel to the grating direction. Fig.10 and Fig.11 The results show that the one-dimensional grating result has a limitation in the viewing angle. When the incident light is incident perpendicular to the grating direction, the diffraction and spectral effect of the one-dimensional grating microstructure is the strongest, and the iridescence effect of the sample is also the most obvious. When the incident light is incident parallel to the grating direction, there is no obvious iridescence effect.

[0086] Although the above embodiment describes the present invention in detail, it is only a part of the embodiments of the present invention, not all of the embodiments. People can also obtain other embodiments based on this embodiment without creativity, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A color dynamic film, characterized in that: It includes a colored micro-pattern layer, a bonding layer and a cylindrical lens array layer which are stacked in sequence; The colored micro-pattern layer comprises a flexible film material and a micro-pattern structure protruding from or sunken into the flexible film material; The micro-pattern structure is formed by a two-dimensional hole array structure or a columnar array structure; or the micro-pattern structure is formed by filling three-dimensional colloidal microspheres; There is a difference between the period of the micro-pattern structure and the period of the cylindrical lens array layer.

2. The color dynamic film according to claim 1, characterized in that: The thickness of the colored micro-pattern layer is 0.5-100 μm.

3. The color dynamic film according to claim 1, characterized in that: The period of the micro-pattern structure is 30 to 200 μm.

4. The color dynamic film according to claim 1, characterized in that: The three-dimensional colloidal microspheres include one or more of SiO2 microspheres, polystyrene microspheres, polymethyl methacrylate microspheres, Fe3O4 microspheres and carbon microspheres; The particle size of the three-dimensional colloidal microspheres is 200-600nm.

5. The color dynamic film according to claim 1, characterized in that: The raw materials for preparing the flexible film material are photoresist and / or varnish.

6. The color dynamic film according to claim 1, characterized in that: The thickness of the cylindrical lens array layer is 50-1000 μm.

7. The color dynamic film according to claim 1, characterized in that: The period of the cylindrical lenses in the cylindrical lens array layer is 30-200 μm, and the aperture is 20-180 μm; the focal length of the cylindrical lenses is equal to the thickness of the cylindrical lens array layer; and the cylindrical lenses are periodically arranged along the aperture arrangement direction.

8. The method for preparing the color dynamic film according to any one of claims 1 to 7, characterized in that: The following steps are involved: When the micro-pattern structure is formed by a two-dimensional hole array structure or a columnar array structure, a grid-processed micro-pattern structure is prepared on the surface of the substrate by photolithography; Transferring the micro-pattern structure using a flexible film material to obtain a colored micro-pattern layer; When the micro-pattern structure is formed by filling three-dimensional colloidal microspheres, a micro-pattern structure with a protruding effect is designed on the back of the substrate, the micro-pattern structure is transferred using a flexible film material, a groove-shaped micro-pattern structure is obtained on one side of the flexible film material, and three-dimensional colloidal microspheres are filled into the groove-shaped micro-pattern structure to obtain the colored micro-pattern layer; The colored micro-pattern layer and the cylindrical lens array layer are bonded together to obtain the colored dynamic film.

9. The preparation method according to claim 8, characterized in that: The three-dimensional colloidal microspheres are filled in a manner selected from the group consisting of blade coating, rod coating and spin coating.

10. Use of the color dynamic film according to any one of claims 1 to 6 or the color dynamic film prepared by the preparation method according to claim 8 or 9 in anti-counterfeiting materials.

Images