Color-changing film, preparation method thereof, housing and electronic equipment

Abstract

The present application provides a color-changing film, a preparation method thereof, a housing, and an electronic device. The color-changing film includes a first film layer; a plurality of elastic particles; the plurality of elastic particles are spaced apart and arranged on one side of the first film layer, and the plurality of elastic particles have a first color; and a second film layer, the second film layer is arranged on the side of the plurality of elastic particles away from the first film layer; when the plurality of elastic particles are in a first state, the orthographic projection area of ​​the elastic particles on the first film layer is a first area S1, and the color-changing film shows the first color; when the plurality of elastic particles are in a second state, the orthographic projection area of ​​the elastic particles on the first film layer is a second area S2, and the color-changing film shows a second color, wherein 25≤S1:S2≤100, and the second color is different from the first color. The color-changing film of the embodiment of the present application has a color-changing effect and a low preparation cost.

Description

Technical Field

[0001] The present application relates to the field of electronics, and in particular to a color-changing film, a preparation method thereof, a housing and an electronic device. Background Art

[0002] The colors of the appearance of current portable electronic devices such as mobile phones and tablets are mostly fixed and homogenized, without the function of changing color. Users are prone to aesthetic fatigue, which seriously affects the user experience. Summary of the Invention

[0003] In response to the above problems, an embodiment of the present application provides a color-changing film, which has a color-changing effect and low preparation cost.

[0004] The first embodiment of the present application provides a color-changing film, which includes:

[0005] first film layer;

[0006] A plurality of elastic particles; the plurality of elastic particles are spaced apart and arranged on one side of the first film layer, the plurality of elastic particles having a first color; and

[0007] a second film layer, the second film layer being disposed on a side of the plurality of elastic particles facing away from the first film layer;

[0008] When the multiple elastic particles are in a first state, the orthographic projection area of ​​the elastic particles on the first film layer is a first area S1, and the color-changing film shows the first color; when the multiple elastic particles are in a second state, the orthographic projection area of ​​the elastic particles on the first film layer is a second area S2, and the color-changing film shows a second color, wherein 25≤S1:S2≤100, and the second color is different from the first color.

[0009] A second embodiment of the present application provides a method for preparing a color-changing film, which includes:

[0010] Providing a substrate mold, wherein the substrate mold has a plurality of grooves arranged at intervals;

[0011] Filling the plurality of grooves with a first glue;

[0012] Disposing a first film layer on the surfaces of the plurality of grooves having the first glue;

[0013] Performing a first curing step to form a plurality of elastic particles from the first glue, and removing the substrate mold, wherein the plurality of elastic particles have a first color; and

[0014] Disposing a second film layer on a side of the plurality of elastic particles away from the first film layer to obtain a color-changing film;

[0015] When the multiple elastic particles are in a first state, the orthographic projection area of ​​the elastic particles on the first film layer is a first area S1, and the color-changing film shows the first color; when the multiple elastic particles are in a second state, the orthographic projection area of ​​the elastic particles on the first film layer is a second area S2, and the color-changing film shows a second color, wherein 25≤S1:S2≤100, and the second color is different from the first color.

[0016] A third embodiment of the present application provides a housing, comprising:

[0017] Shell body;

[0018] an adhesive layer, the adhesive layer being disposed on a surface of the housing body; and

[0019] The color-changing film described in the embodiment of the present application is bonded to the surface of the shell body through the adhesive layer.

[0020] A fourth embodiment of the present application provides an electronic device, comprising:

[0021] Display component;

[0022] The housing described in the embodiment of the present application is arranged on one side of the display assembly; and

[0023] A circuit board assembly is provided between the housing and the display assembly. The circuit board assembly is electrically connected to the display assembly and the housing, respectively, and is used to control the display assembly to display and control the color-changing film to change color.

[0024] The color-changing film of the embodiment of the present application includes a plurality of elastic particles. When the plurality of elastic particles are in a first state, the orthographic projection area of ​​the elastic particles on the first film layer is a first area S1, and the color-changing film displays a first color. When the plurality of elastic particles are in a second state, the orthographic projection area of ​​the elastic particles on the first film layer is a second area, and the color-changing film displays a second color S2, wherein 25≤S1:S2≤100, and the second color is different from the first color. In this way, when the plurality of elastic particles are in the first state, the first film layer is basically covered by the elastic particles, so that the color-changing film displays the first color of the elastic particles; when the plurality of elastic particles are in the second state, the area occupied by the elastic particles on the surface of the first film layer is very small and is almost invisible to the naked eye. The color-changing film displays the color of the film layer on the side of the first film layer or the second film layer, thereby allowing the color-changing film to change color between the first color and the second color, thereby having a color-changing function. In addition, the elastic particles of the present application are insensitive to water and oxygen, and do not require a complex packaging structure and expensive water and oxygen barrier films. The color-changing film can also have a longer service life and greatly reduce the preparation cost of the color-changing film. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 Schematic diagram of the structure of the color-changing film according to one embodiment of the present application.

[0027] Figure 2 The color-changing film of one embodiment of the present application is Figure 1 Schematic diagram of the local cross-sectional structure along the AA direction, wherein the elastic particles are in the first state.

[0028] Figure 3 The color-changing film of one embodiment of the present application is Figure 1 Schematic diagram of the local cross-sectional structure along the AA direction, wherein the elastic particles are in the second state.

[0029] Figure 4 The color-changing film of one embodiment of the present application is Figure 1 An enlarged view of the position of the dotted box I, wherein the elastic particles are in the first state.

[0030] Figure 5 The color-changing film of one embodiment of the present application is Figure 1 An enlarged view of the position of the dotted box I, wherein the elastic particles are in the second state.

[0031] Figure 6 The color-changing film of one embodiment of the present application is Figure 2 An enlarged view of the position of the dotted box II, where the elastic particles are in the first state.

[0032] Figure 7 The color-changing film of one embodiment of the present application is Figure 3 An enlarged view of the position of the dotted box III, where the elastic particles are in the second state.

[0033] Figure 8 This is another embodiment of the color-changing film edge of the present application Figure 1 Schematic diagram of the local cross-sectional structure along the AA direction, wherein the elastic particles are in the second state.

[0034] Figure 9 This is another embodiment of the color-changing film edge of the present application Figure 1 Schematic diagram of the local cross-sectional structure along the AA direction, wherein the elastic particles are in the first state.

[0035] Figure 10 This is another embodiment of the color-changing film edge of the present application Figure 1 Schematic diagram of the local cross-sectional structure along the AA direction, wherein the elastic particles are in the second state.

[0036] Figure 11 This is another embodiment of the color-changing film edge of the present application Figure 1 Schematic diagram of the local cross-sectional structure along the AA direction, wherein the elastic particles are in the second state.

[0037] Figure 12 This is a flow chart of a method for preparing a color-changing film according to an embodiment of the present application.

[0038] Figure 13 It is a structural schematic diagram corresponding to the process of the preparation method of the color-changing film of an embodiment of the present application.

[0039] Figure 14 Schematic diagram of the structure of a substrate mold according to an embodiment of the present application.

[0040] Figure 15 4 is a flow chart of a method for preparing a substrate mold according to an embodiment of the present application.

[0041] Figure 16 It is a structural schematic diagram corresponding to the process of the substrate mold preparation method according to an embodiment of the present application.

[0042] Figure 17 This is a flow chart of a method for preparing a color-changing film according to another embodiment of the present application.

[0043] Figure 18 This is a flow chart of a method for preparing a color-changing film according to another embodiment of the present application.

[0044] Figure 19 It is a structural schematic diagram of a shell according to an embodiment of the present application.

[0045] Figure 20 The shell of one embodiment of the present application is along Figure 19 Schematic diagram of the cross-sectional structure in the middle BB direction.

[0046] Figure 21 It is a schematic structural diagram of an electronic device according to an embodiment of the present application.

[0047] Figure 22 It is a schematic diagram of a partial exploded structure of an electronic device according to an embodiment of the present application.

[0048] Figure 23 This is a circuit block diagram of an electronic device according to an embodiment of the present application.

[0049] Figure 24 This is a schematic diagram of a partial exploded structure of an electronic device according to another embodiment of the present application.

[0050] Figure 25 This is a circuit block diagram of an electronic device according to another embodiment of the present application. DETAILED DESCRIPTION

[0051] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0052] The terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish between different objects, not to describe a particular order. Furthermore, the terms "including," "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to the process, method, product, or apparatus.

[0053] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

[0054] It should be noted that, for the convenience of explanation, in the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments.

[0055] In order to make the shell have the ability to change color, microcapsule electrophoresis technology can be used to make the shell have different colors in electric fields of different directions. Specifically, the shell includes a first ITO layer, a microcapsule layer, and a second ITO layer stacked in sequence. The microcapsule layer includes a plurality of microcapsules arranged in an array, each microcapsule including a plurality of white titanium oxide particles with a positive charge, a plurality of black carbon particles with a negative charge, and an electrophoretic liquid. When a positive charge is applied to the first ITO layer and a negative charge is applied to the second ITO layer, the carbon particles move toward the first ITO layer and the titanium dioxide particles move toward the second ITO layer, causing the first ITO layer side of the shell to appear black. When a negative charge is applied to the first ITO layer and a positive charge is applied to the second ITO layer, the titanium dioxide particles move toward the first ITO layer and the carbon particles move toward the second ITO layer, causing the first ITO layer side of the shell to appear white, thereby giving the shell the color-changing function. However, microcapsules are sensitive to water and oxygen. When water and oxygen enter the shell, the microcapsules are easily oxidized or corroded, causing them to rupture and allowing titanium dioxide and carbon particles to escape, rendering the shell's color-changing function ineffective. Furthermore, to further extend the shell's color-changing lifespan, water and oxygen barrier layers can be placed on opposite sides of the microcapsule to block water and oxygen. However, these barrier layers are typically expensive, significantly increasing the cost of the shell.

[0056] The present invention provides a color-changing film 100, which can be applied to portable electronic devices such as mobile phones, tablet computers, laptop computers, desktop computers, smart bracelets, smart watches, e-readers, game consoles, etc. Figure 21 and Figure 22 When used, the color-changing film 100 can be attached to the middle frame, back cover (battery cover), decorative parts, etc. of an electronic device to give the electronic device a color-changing appearance. In the schematic diagram of this application, the electronic device is illustrated by taking a mobile phone as an example, which should not be understood as limiting the electronic device of this application.

[0057] Figure 1 Schematic diagram of the structure of the color-changing film according to one embodiment of the present application. Figure 2 The color-changing film of one embodiment of the present application is Figure 1 Schematic diagram of the local cross-sectional structure along the AA direction, wherein the elastic particles are in the first state. Figure 3 The color-changing film of one embodiment of the present application is Figure 1 Schematic diagram of the local cross-sectional structure along the AA direction, wherein the elastic particles are in the second state.

[0058] See Figures 1 to 3The color-changing film 100 provided in the embodiment of the present application includes a first film layer 10, a plurality of elastic particles 30, and a second film layer 50. The plurality of elastic particles 30 are arranged at intervals on one side of the first film layer 10, and the plurality of elastic particles 30 have a first color; the second film layer 50 is arranged on the side of the plurality of elastic particles 30 away from the first film layer 10; when the plurality of elastic particles 30 are in the first state (such as Figure 2 As shown), the orthographic projection area of ​​the elastic particles 30 on the first film layer 10 is the first area S1, and the color-changing film 100 shows the first color; when the plurality of elastic particles 30 are in the second state (as shown), the orthographic projection area of ​​the elastic particles 30 on the first film layer 10 is the first area S1, and the color-changing film 100 shows the first color; Figure 3 As shown), the orthographic projection area of ​​the elastic particles 30 on the first film layer 10 is a second area S2, and the color-changing film 100 shows a second color, wherein 25≤S1:S2≤100, and the second color is different from the first color.

[0059] The elastic particles 30 are particles that are elastic and can undergo elastic deformation when subjected to external forces such as pressure or tension, and can recover after the external forces are removed.

[0060] The plurality of elastic particles 30 are spaced apart on one side of the first film layer 10 . The plurality of elastic particles 30 may be arranged in an array on one side of the first film layer 10 ; or the plurality of elastic particles 30 may be arranged on one side of the first film layer 10 according to a preset pattern.

[0061] The plurality of elastic particles 30 may be spaced apart on one side of the first film layer 10. The plurality of elastic particles 30 may be spaced apart on the surface of the first film layer 10. Alternatively, another film layer may be provided between the plurality of elastic particles 30 and the first film layer 10, and the plurality of elastic particles 30 may be spaced apart on the surface of the other film layer away from the first film layer 10. In the schematic diagram of the embodiment of the present application, the plurality of elastic particles 30 are provided on the surface of the first film layer 10 as an example, which should not be construed as limiting the color-changing film 100 provided in the embodiment of the present application.

[0062] The second film layer 50 is arranged on the side of the multiple elastic particles 30 facing away from the first film layer 10. The second film layer 50 can be arranged on the surface of the multiple elastic particles 30 facing away from the first film layer 10, or the second film layer 50 is arranged on the side of the multiple elastic particles 30 facing away from the first film layer 10, and there is a certain gap between the multiple elastic particles 30, such as being connected to the first film layer 10 through multiple elastic support members in the following embodiment, and being arranged on the side of the multiple elastic particles 30 facing away from the first film layer 10.

[0063] Optionally, the first color may be, but is not limited to, at least one of black, red, white, blue, green, orange, yellow, pink, and purple. Optionally, the second color may be, but is not limited to, at least one of black, red, white, blue, green, orange, yellow, pink, purple, and transparent (i.e., colorless). In the following embodiments of the present application, the first color being black and the second color being white are used as an example for detailed description, which should not be construed as limiting the color-changing film 100 provided in the embodiments of the present application. At least one refers to more than one; or greater than or equal to one.

[0064] The plurality of elastic particles 30 may have a first color. The plurality of elastic particles 30 may all have the same color, for example, all black. Alternatively, the plurality of elastic particles 30 may have at least two colors. The plurality of elastic particles 30 of at least two colors may be arranged according to a predetermined pattern, such that when the plurality of elastic particles 30 are in the first state, the color-changing film 100 displays a first color pattern composed of multiple colors. For example, some elastic particles 30 may be red, some may be yellow, and some may be orange. The plurality of elastic particles 30 may be arranged according to a predetermined pattern, such that when the plurality of elastic particles 30 are in the first state, the color-changing film 100 displays a first color pattern composed of a regular arrangement of red, yellow, and orange. At least two refers to more than two or greater than or equal to two.

[0065] The color-changing film 100 may show a first color, and the first color may be shown on the first film layer 10 side of the color-changing film 100, or the first color may be shown on the second film layer 50 side of the color-changing film 100, or both the first film layer 10 side and the second film layer 50 side of the color-changing film 100 may show the first color. The color-changing film 100 may show a second color, and the second color may be shown on the first film layer 10 side of the color-changing film 100, or the second film layer 50 side of the color-changing film 100, or both the first film layer 10 side and the second film layer 50 side of the color-changing film 100 may show the second color.

[0066] 25≤S1:S2≤100 means that the ratio of the first area to the second area is any value between 25 and 100. In other words, the first area is between 25 and 100 times the second area. Specifically, S1:S2 can be, but is not limited to, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, or 100. When the ratio of S1:S2 is less than 25, the elastic particles 30 are relatively dense. When the elastic particles 30 are in the second state, the color-changing film 100 not only reveals the second color, but also reveals the first color of the elastic particles 30, affecting the color-changing effect of the color-changing film 100. As the ratio of S1:S2 increases, when the elastic particles 30 are in the second state, the second color revealed by the color-changing film 100 is purer (i.e., the less mixed colors), and has a better color rendering effect. However, when the ratio of S1:S2 is higher than 100, the deformation recovery performance of the elastic particles 30 will be affected, or the material requirements for the elastic particles 30 will be high, and it is difficult to find a material that meets this condition.

[0067] The color-changing film 100 of the embodiment of the present application includes a plurality of elastic particles 30. When the plurality of elastic particles 30 are in a first state, the orthogonal projection area of ​​the elastic particles 30 on the first film layer 10 is a first area S1, and the color-changing film 100 displays a first color. When the plurality of elastic particles 30 are in a second state, the orthogonal projection area of ​​the elastic particles 30 on the first film layer 10 is a second area, and the color-changing film 100 displays a second color S2, wherein 25≤S1:S2≤100, and the second color is different from the first color. Thus, when the plurality of elastic particles 30 are in the first state, the first film layer 10 is substantially covered by the elastic particles 30, so that the color-changing film 100 displays the first color of the elastic particles 30. When the plurality of elastic particles 30 are in the second state, the area occupied by the elastic particles 30 on the surface of the first film layer 10 is very small and is almost invisible to the naked eye. The color-changing film 100 displays the color of the film layer on the first film layer 10 or the second film layer 50 side. As a result, the color-changing film 100 can change color between the first color and the second color, thereby having a color-changing function. In addition, the elastic particles 30 of the present application are insensitive to water and oxygen, and do not require a complex packaging structure and expensive water and oxygen barrier films. This can also extend the service life of the color-changing film 100 and greatly reduce the preparation cost of the color-changing film 100.

[0068] Figure 4 This is a color-changing film according to an embodiment of the present application. Figure 1 An enlarged view of the position of the dotted box I, wherein the elastic particles are in the first state. Figure 5 This is a color-changing film according to an embodiment of the present application. Figure 1 An enlarged view of the position of the dotted box I, wherein the elastic particles are in the second state.

[0069] In a specific embodiment, the first color is black and the second color is white. When the plurality of elastic particles 30 are in the first state (eg Figure 4 As shown), the orthographic projection area of ​​the elastic particles 30 on the first film layer 10 is the first area S1, and the color-changing film 100 appears black; when the plurality of elastic particles 30 are in the second state (as shown), the orthographic projection area of ​​the elastic particles 30 on the first film layer 10 is the first area S1, and the color-changing film 100 appears black; Figure 5 As shown), the orthographic projection area of ​​the elastic particles 30 on the first film layer 10 is the second area S2, and the color-changing film 100 appears white, so that the color-changing film 100 achieves a color-changing effect similar to electronic ink.

[0070] Please see again Figure 4 Optionally, when the plurality of elastic particles 30 are in the first state, any two adjacent elastic particles 30 abut or partially overlap. When two adjacent elastic particles 30 abut or partially overlap, the plurality of elastic particles 30 can better cover the surface of the first film layer 10, so that the color-changing film 100 displays a more uniform first color (in other words, better presents the first color), avoiding the contamination of the second color when the first color is displayed, thereby achieving better color change; in other words, when the first color is displayed, the second color leaks out. Partial overlap refers to partial overlap or partial superposition.

[0071] Optionally, when the elastic particles 30 change from the second state to the first state (in other words, from Figure 3 and Figure 5 The status becomes Figure 2 and Figure 4 state), the plurality of elastic particles 30 are compressed and elastically deformed, so that the color-changing film 100 shows the first color; when the elastic particles 30 change from the first state to the second state (in other words, from Figure 2 and Figure 4 The status becomes Figure 3 and Figure 5 When the color-changing film 100 is in the second state, the multiple elastic particles 30 undergo deformation recovery, causing the color-changing film 100 to display the second color. Furthermore, when the elastic particles 30 are in the second state and the first film layer 10 and the second film layer 50 move toward each other, the multiple elastic particles 30 are compressed and elastically deformed, causing the elastic particles 30 to change from the second state to the first state. When the elastic particles 30 are in the first state and the first film layer 10 and the second film layer 50 move away from each other, the multiple elastic particles 30 undergo deformation recovery, causing the elastic particles 30 to change from the first state to the second state.

[0072] Figure 6 The color-changing film of one embodiment of the present application is Figure 2 An enlarged view of the position of the dotted box II, where the elastic particles are in the first state. Figure 7 The color-changing film of one embodiment of the present application is Figure 3An enlarged view of the position of the dotted box III, where the elastic particles are in the second state.

[0073] When at least one of the first film layer 10 and the second film layer 50 is subjected to a compressive force (or compressive stress, such as Figure 6 As shown by arrow F1, the first film layer 10 and the second film layer 50 move toward each other, and the multiple elastic particles 30 are compressed and elastically deformed. When the multiple elastic particles 30 are compressed to a certain extent, two adjacent elastic particles 30 abut or partially overlap, and the elastic particles 30 with the first color cover the entire first film layer 10, so that the color-changing film 100 presents the color of the elastic particles 30, that is, the first color. When the first film layer 10 and the second film layer 50 are not subjected to force, or the first film layer 10 and the second film layer 50 are subjected to opposite forces (such as Figure 7 As shown by arrow F2, the multiple elastic particles 30 undergo deformation recovery and return to their original state. At this time, the area occupied by the elastic particles 30 in the first film layer 10 is very small and is almost invisible to the naked eye. The color-changing film 100 presents the color of the colored film layer on the side of the first film layer 10 or the second film layer 50.

[0074] It should be noted that at least one of the first film layer 10 and the second film layer 50 is subjected to a compressive force, which may be an extrusion force, electrostatic force, electric field force, magnetic field force, gravity, etc. when squeezed. The first film layer 10 and the second film layer 50 are subjected to opposing forces, which may be, but are not limited to, tension, electrostatic force, repulsive force, elastic recovery force, etc. In the specific embodiments of the present application, the compressive force and the opposing force are illustrated by electrostatic force, or electrostatic force and elastic recovery force, and should not be understood as a limitation on the color-changing film 100 of the present application. The above compressive force and opposing force can be either a force directly acting on the color-changing film 100 from the outside, or a force generated inside the color-changing film 100 under certain conditions.

[0075] Optionally, at least one of the first film layer 10 and the second film layer 50 is a transparent or translucent film layer. In one specific embodiment, the first film layer 10 is a transparent or translucent film layer, and the second film layer 50 is an opaque film layer. When the elastic particles 30 are in the first state, the color of the elastic particles 30 (i.e., the first color) is displayed on the first film layer 10 side of the color-changing film 100. When the elastic particles 30 are in the second state, the color of the second film layer 50 (i.e., the second color) is displayed on the first film layer 10 side of the color-changing film 100. In other embodiments, the second film layer 50 is a transparent or translucent film layer, and the first film layer 10 is an opaque film layer. When the elastic particles 30 are in the first state, the color of the elastic particles 30 (i.e., the first color) is displayed on the second film layer 50 side of the color-changing film 100. When the elastic particles 30 are in the second state, the color of the first film layer 10 (i.e., the second color) is displayed on the second film layer 50 side of the color-changing film 100. In some other embodiments, the first film layer 10 is a transparent or translucent film layer, and the second film layer 50 is a transparent film layer or a translucent film layer. When the elastic particles 30 are in the first state, the first film layer 10 and the second film layer 50 sides of the color-changing film 100 both show the color of the elastic particles 30 (i.e., the first color); when the elastic particles 30 are in the second state, the first film layer 10 and the second film layer 50 sides of the color-changing film 100 both show the color of the first film layer 10 and the second film layer 50 superimposed on each other (i.e., the second color).

[0076] Figure 8 This is another embodiment of the color-changing film edge of the present application Figure 1 Schematic diagram of the local cross-sectional structure along the AA direction, wherein the elastic particles are in the second state. Figure 9 This is another embodiment of the color-changing film edge of the present application Figure 1 Schematic diagram of the local cross-sectional structure along the AA direction, wherein the elastic particles are in the first state.

[0077] See Figure 8 and Figure 9 In some embodiments, the first film layer 10 includes a first conductive layer 11. The first conductive layer 11 may be, but is not limited to, at least one of indium tin oxide (ITO), copper, silver, iron, aluminum, and the like. Optionally, the first film layer 10 further includes a first substrate layer 13, which is disposed farther from the plurality of elastic particles 30 than the first conductive layer 11. The first substrate layer 13 may be, but is not limited to, one or more of polymethyl methacrylate, polycarbonate, polyethylene terephthalate, and the like.

[0078] The second film layer 50 includes a second conductive layer 51. The first conductive layer 11 can be, but is not limited to, at least one of indium tin oxide (ITO), copper, silver, iron, aluminum, etc. Optionally, the second film layer 50 also includes a second substrate layer 53, which is arranged away from the plurality of elastic particles 30 compared to the second conductive layer 51. The second substrate layer 53 can be, but is not limited to, one or more of polymethyl methacrylate, polycarbonate, polyethylene terephthalate, etc. It should be noted that the material of the first conductive layer 11 and the second conductive layer 51 can be the same or different. The material of the first substrate layer 13 and the second substrate layer 53 can be the same or different.

[0079] Please also see Figure 6 When the first conductive layer 11 and the second conductive layer 51 are loaded with different charges, so that the distance between the first film layer 10 and the second film layer 50 is the first distance d1, the plurality of elastic particles 30 are in the first state. Figure 7 When the first conductive layer 11 and the second conductive layer 51 are charged with the same charge, such that a second distance d2 exists between the first film layer 10 and the second film layer 50, the plurality of elastic particles 30 are in the second state, wherein the second distance is greater than the first distance. Specifically, when the first conductive layer 11 and the second conductive layer 51 are charged with opposite charges, the first conductive layer 11 and the second conductive layer 51 move toward each other under the action of the first electrostatic force, such that the first film layer 10 and the second film layer 50 are at the first distance, and the plurality of elastic particles 30 are in the first state. When the first conductive layer 11 and the second conductive layer 51 are charged with the same charge, the first conductive layer 11 and the second conductive layer 51 move away from each other under the action of the second electrostatic force, such that the first film layer 10 and the second film layer 50 are at the second distance, and the plurality of elastic particles 30 are in the second state. The color-changing film 100 of the present application designs the types of charges applied to the first conductive layer 11 and the second conductive layer 51, thereby generating electrostatic forces in different directions between the first conductive layer 11 and the second conductive layer 51, thereby causing the elastic particles 30 to change between the first state and the second state, thereby achieving the color-changing function of the color-changing film 100. The color-changing film 100 of the present application has lower energy consumption and is visible in sunlight with no blind spots, providing a better user experience in sunlight. Moreover, because the color-changing film 100 does not emit light itself, relying entirely on reflected light, the patterns and colors presented by the color-changing film 100 are softer and do not cause damage to the eyes.

[0080] The first conductive layer 11 and the second conductive layer 51 are loaded with different charges. The first conductive layer 11 can be loaded with positive charges and the second conductive layer 51 can be loaded with negative charges; or the first conductive layer 11 can be loaded with negative charges and the second conductive layer 51 can be loaded with positive charges.

[0081] The first conductive layer 11 and the second conductive layer 51 are charged with the same charge. Both the first conductive layer 11 and the second conductive layer 51 can be charged with positive charge, or both the first conductive layer 11 and the second conductive layer 51 can be charged with negative charge.

[0082] It should be understood that the magnitudes of the first electrostatic force and the second electrostatic force may be the same or different.

[0083] Specifically, when the color-changing film 100 needs to display the first color, a positive voltage is applied to the first conductive layer 11 and a negative voltage is applied to the second conductive layer 51, so that the first conductive layer 11 is positively charged and the second conductive layer 51 is negatively charged; or, a negative voltage is applied to the first conductive layer 11 and a positive voltage is applied to the second conductive layer 51, so that the first conductive layer 11 is negatively charged and the second conductive layer 51 is positively charged. The positive and negative charges attract each other, generating a first electrostatic force in opposite directions, so that the first conductive layer 11 and the second conductive layer 51 move toward each other under the action of the first electrostatic force, squeezing the elastic particles 30, thereby compressing the elastic particles 30 and causing them to undergo elastic deformation, covering the entire first conductive layer 11, thereby causing the color-changing film 100 to display the first color (the color of the elastic particles 30, such as black).

[0084] When the color-changing film 100 is required to display a second color, a positive voltage is applied to both the first conductive layer 11 and the second conductive layer 51, so that both the first conductive layer 11 and the second conductive layer 51 are positively charged; or a negative voltage is applied to both the first conductive layer 11 and the second conductive layer 51, so that both the first conductive layer 11 and the second conductive layer 51 are negatively charged. Positive charges repel each other, or negative charges repel each other, generating a second electrostatic force in opposite directions. Under the action of the second electrostatic force, the first conductive layer 11 and the second conductive layer 51 move in opposite directions, causing the elastic particles 30 to deform and return to small particles that are difficult to detect with the naked eye, thereby causing the color-changing film 100 to display a second color (e.g., colorless or white).

[0085] The color-changing film 100 is applied to portable electronic devices such as mobile phones and can be powered by electronic devices. When a positive voltage is applied to the first conductive layer 11 or the second conductive layer 51, the positive voltage output by the electronic device has a numerical range of 0.1V to 5V; specifically, it can be, but not limited to, 0.1V, 0.5V, 1V, 1.5V, 2V, 2.5V, 3V, 3.5V, 4V, 4.5V, 5V, etc. It should be noted that when the electronic device includes a boost chip, the positive voltage output by the electronic device can have a numerical range of 0.1V to 100V, specifically, it can be, but not limited to, 0.1V, 5V, 10V, 20V, 30V, 40V, 50V, 60V, 70V, 80V, 90V, 100V, etc. In the embodiments of the present application, when the numerical range a to b is involved, unless otherwise specified, it means including the endpoint value a and including the endpoint value b. For example, the positive voltage range is 0.1V to 5V, and the positive voltage range is 0.1V to 5V, which can be any value between 0.1mm and 5mm, including the endpoints 0.1mm and 5mm.

[0086] The color-changing film 100 is applied to portable electronic devices such as mobile phones and can be powered by electronic devices. When a negative voltage is applied to the first conductive layer 11 or the second conductive layer 51, the negative voltage output by the electronic device has a value ranging from -0.1V to -5V. Specifically, it can be, but not limited to, -0.1V, -0.5V, -1V, -1.5V, -2V, -2.5V, -3V, -3.5V, -4V, -4.5V, -5V, etc. It should be noted that when the electronic device includes a boost chip, the negative voltage output by the electronic device can have a value ranging from -0.1V to -100V. Specifically, it can be, but not limited to, -0.1V, -5V, -10V, -20V, -30V, -40V, -50V, -60V, -70V, -80V, -90V, -100V, etc.

[0087] In some embodiments, the compressive strain ε1 of the elastic particles 30 is ≥ 90%. Specifically, it can be, but is not limited to, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, etc. The smaller the compressive strain of the elastic particles 30, the denser the elastic particles 30 need to be arranged so that the color-changing film 100 can present the first color of the elastic particles 30 when the elastic particles 30 are in the first state. In this way, when the elastic particles 30 are in the second state, since the elastic particles 30 cover a larger area on the first film layer 10, the second color presented by the color-changing film 100 is mixed with the first color, affecting the color-changing effect of the color-changing film 100. In other words, when the second color is revealed, color leakage occurs, and the first color leaks out.

[0088] In the embodiment of the present application, the compressive strain ε1 of the elastic particle 30 is calculated by the following formula: ε1 = Δh1 / h 10 =(h 10 -h1) / h 10 × 100%, where h 10 is the maximum thickness of the elastic particles 30 in the second state (ie, the maximum thickness along the stacking direction of the first film layer 10 and the second film layer 50, such as Figure 7 ), h1 is the maximum thickness of the elastic particles 30 in the first state, and Δh1 is the difference between the maximum thickness of the elastic particles 30 in the second state and the maximum thickness of the elastic particles 30 in the first state. When the elastic particles 30 are in the first state, the maximum thickness h1 of the elastic particles 30 is equal to the first distance d1 between the plurality of first film layers 10 and the second film layer 50.

[0089] Optionally, the Shore hardness HA1 of the elastic particles 30 is in the range of 5A≤HA1≤20A; specifically, HA1 may be, but is not limited to, 5A, 6A, 8A, 10A, 12A, 14A, 16A, 18A, 20A, etc. When HA1 is less than 5A, the elastic particles 30 have a weak deformation recovery ability, which affects the color change effect of the color-changing film 100 when the elastic particles 30 change from the first state to the second state. When HA1 is greater than 20A, the elastic particles 30 may not be fully deformed when changing from the second state to the first state, or the deformation speed may be too slow, which affects the color change speed of the color-changing film 100 and even affects the color change effect of the color-changing film 100 between the second color and the first color.

[0090] Please see again Figure 5 Optionally, when the elastic particles 30 are in the second state, the distance w between the two farthest points of the elastic particles 30 on the orthographic projection of the first film layer 10 is in the range of: 5μm≤w≤100μm; specifically, it can be, but is not limited to, 5μm, 10μm, 15μm, 20μm, 25μm, 30μm, 35μm, 40μm, 45μm, 50μm, 55μm, 60μm, 65μm, 70μm, 75μm, 80μm, 85μm, 90μm, 95μm, 100μm, etc. When w is less than 5μm, the process difficulty of preparing the elastic particles 30 is increased. When w is greater than 100μm, the elastic particles 30 are visible to the naked eye, so that when the elastic particles are in the second state, in addition to presenting the second color, the first color of the elastic particles 30 can also be seen, affecting the appearance of the color-changing film 100.

[0091] Optionally, the elastic particles 30 can be in various shapes such as sphere, hemisphere, ellipsoid, semi-ellipsoid, pyramid, prism, etc. The size of the elastic particles 30 only needs to meet the relevant parameter requirements of the embodiment of the present application. The embodiment of the present application does not specifically limit the shape of the elastic particles 30.

[0092] Please see again Figure 7 Optionally, when the elastic particles 30 are in the second state, along the stacking direction of the first film layer 10 and the second film layer 50, the maximum thickness h of the elastic particles 30 is 10 The range is 5μm≤h 10 ≤70 μm; specifically, it can be, but is not limited to, 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, etc. When the elastic particles 30 are in the second state, the distance w between the two farthest points of the elastic particles 30 on the orthographic projection of the first film layer 10 must be controlled to be invisible to the naked eye. Therefore, a maximum thickness h of the elastic particles 30 that is too large or too small will increase the difficulty of the elastic particle 30 preparation process.

[0093] Please see again Figure 5 Optionally, when the elastic particles 30 are in the second state, the shortest distance d between any two adjacent elastic particles 30 is in the range of 25 μm ≤ d ≤ 1 mm; specifically, it can be, but is not limited to, 25 μm, 50 μm, 100 μm, 200 μm, 300 μm, 400 μm, 500 μm, 600 μm, 700 μm, 800 μm, 900 μm, 1 mm, etc. When the shortest distance d between any two adjacent elastic particles 30 is less than 25 μm, the elastic particles 30 are arranged more densely, and the elastic particles 30 cover a larger area on the first film layer 10. When the elastic particles 30 are in the second state, the second color presented by the color-changing film 100 is mixed with the first color (in other words, when the second color is revealed, color leakage occurs, and the first color leaks out), affecting the appearance of the color-changing film 100. When the shortest distance d between any two adjacent elastic particles 30 is greater than 25 μm, the elastic particles 30 are required to have a large compressive strain, which places high demands on the material of the elastic particles 30 , and it is difficult to find a material that meets this condition.

[0094] Optionally, the elastic particles 30 include at least one of silica gel particles and rubber particles. Compared with rubber particles, silica gel particles are used as the elastic particles 30 because they have better chemical stability. Therefore, the use of silica gel particles can make the color-changing film 100 have a better color-changing life. The glass transition temperature (Tg) of the elastic particles 30 is less than 20°C; for example, it can be 19°C, 10°C, 0°C, -10°C, -20°C, -50°C, -80°C, etc. Further, the glass transition temperature (Tg) of the elastic particles 30 is less than 0°C. Furthermore, the glass transition temperature (Tg) of the elastic particles 30 is less than -30°C. When the color-changing film 100 is used, the temperature is at room temperature. When the glass transition temperature is higher than 20°C, the glass transition temperature is close to room temperature. At this time, the elastic particles 30 are between the glassy state and the highly elastic state or have just changed from the glassy state to the highly elastic state. The elasticity of the elastic particles 30 is relatively small. When changing from the second color to the first color, the elastic particles 30 deform slowly or even fail to deform, which ultimately causes the color-changing film 100 to change color slowly, or even fail to change color until half of the color change (i.e., the first color and the second color coexist). The lower the glass transition temperature of the elastic particles 30, the better the elasticity of the elastic particles 30 at room temperature, the faster the color change speed of the color-changing film 100, and the better the color change performance.

[0095] Please see again Figure 8 and Figure 9 The color-changing film 100 of the embodiment of the present application further includes an elastic support member 40, which is disposed between the first film layer 10 and the second film layer 50, and the opposite ends of the elastic support member 40 are respectively connected to the first film layer 10 and the second film layer 50.

[0096] In some embodiments, the elastic support member 40 is disposed around the plurality of elastic particles 30, thereby encapsulating the plurality of elastic particles 30 between the first film layer 10 and the second film layer 50. Specifically, the elastic support member 40 is disposed between the first conductive layer 11 and the second conductive layer 51, and surrounds the plurality of elastic particles 30. The opposite ends of the elastic support member 40 are connected to the first conductive layer 11 and the second conductive layer 51, respectively, thereby encapsulating the plurality of elastic particles 30 between the first conductive layer 11 and the second conductive layer 51. In other embodiments, the elastic support member 40 may be a plurality of elastic support pillars spaced apart and disposed at random locations on the surface of the first film layer 10.

[0097] When the first conductive layer 11 and the second conductive layer 51 are loaded with opposite charges, so that the first film layer 10 and the second film layer 50 are at a first distance, the elastic support member 40 is in a compressed state and the plurality of elastic particles 30 are in a first state (eg, Figure 9When the first conductive layer 11 and the second conductive layer 51 are charged with the same charge, or when neither the first conductive layer 11 nor the second conductive layer 51 is charged, at least under the action of the elastic restoring force of the elastic support member 40, the first film layer 10 and the second film layer 50 are at a second distance and the plurality of elastic particles 30 are in a second state (as shown); Figure 8 As shown), wherein the second distance is greater than the first distance. Specifically, when the first conductive layer 11 and the second conductive layer 51 are loaded with opposite charges, the first conductive layer 11 and the second conductive layer 51 are respectively subjected to opposite electrostatic forces, so that the first film layer 10 and the second film layer 50 are at a first distance, the elastic support member 40 is in a compressed state and the plurality of elastic particles 30 are in a first state, and the color-changing film 100 shows a first color (for example, black). When the first conductive layer 11 and the second conductive layer 51 are loaded with the same charge, the first conductive layer 11 and the second conductive layer 51 are subjected to opposite electrostatic forces and opposite elastic restoring forces of the elastic support members 40, so that the first film layer 10 and the second film layer 50 are at a second distance, and the plurality of elastic particles 30 are in a second state, and the color-changing film 100 shows a second color (for example, white). When neither the first conductive layer 11 nor the second conductive layer 51 is charged, the elastic restoring force of the elastic support member 40 alone causes the first film layer 10 and the second film layer 50 to be at a second distance, and the plurality of elastic particles 30 to be in a second state, resulting in the color-changing film 100 exhibiting a second color. When the color-changing film 100 changes from the first color to the second color, compared to a solution in which the first conductive layer 11 and the second conductive layer 51 are uncharged (i.e., color change relies primarily on elastic restoring force), charging the first conductive layer 11 and the second conductive layer 51 with the same charge (i.e., elastic restoring force and electrostatic force act together) allows the color-changing film 100 to change color faster.

[0098] In some embodiments, the compressive strain ε2 of the elastic support member 40 is ≥ 90%. Specifically, it can be, but is not limited to, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, etc. If the compressive strain of the elastic support member 40 is less than 90%, the compressibility of the elastic support member 40 is too small. When the elastic particles 30 are in the first state when needed, even if the elastic support member 40 is compressed to the minimum state, it is difficult to fully compress the elastic particles 30 to cover the entire first film layer 10, thereby affecting the presentation of the first color of the color-changing film 100.

[0099] Please see again Figure 8 and Figure 9 In the embodiment of the present application, the compressive strain ε2 of the elastic support member 40 is calculated by the following formula: ε2 = Δh2 / h 20 =(h 20 -h2) / h 20 × 100%, where h 20is the maximum thickness of the elastic support member 40 in the second state (i.e., the maximum thickness along the stacking direction of the first film layer 10 and the second film layer 50), h2 is the maximum thickness of the elastic support member 40 in the first state, and Δh2 is the difference between the maximum thickness of the elastic support member 40 in the second state and the maximum thickness of the elastic support member 40 in the first state.

[0100] In some embodiments, the Shore hardness HA2 of the elastic support member 40 is greater than the Shore hardness HA1 of the elastic particles 30. This ensures that when the first film layer 10 and the second film layer 50 are under zero force, the elastic support member 40 can provide effective support, preventing the elastic particles 30 from being squeezed by the weight of the first film layer 10 or the second film layer 50, causing elastic deformation and affecting the second color of the color-changing film 100. Furthermore, after the first electrostatic force is removed from the first film layer 10 or the second film layer 50, the first film layer 10 or the second film layer 50 can return to its initial state due to the elastic recovery force of the elastic support member 40.

[0101] Optionally, the Shore hardness HA2 of the elastic support member 40 is in the range of 10A≤HA2≤30A. Specifically, HA2 can be, but is not limited to, 10A, 12A, 14A, 16A, 18A, 20A, 22A, 24A, 26A, 28A, 30A, etc. When HA2 is less than 10A, the elastic support member 40 cannot well support the gravity of the first film layer 10 or the second film layer 50, so that when the color-changing film 100 needs to reveal the second color, the elastic particles 30 will also be partially squeezed, thereby doping the first color into the second color (in other words, when the second color is revealed, color leakage occurs, and the first color leaks out). In addition, at this time, the elastic restoring force of the elastic support member 40 is relatively small, which affects the color-changing effect of the color-changing film 100 when the elastic particles 30 change from the first state to the second state. When HA2 is greater than 30A, the elastic support member 40 may not be completely deformed when the elastic particles 30 change from the second state to the first state, or the deformation speed may be too slow, affecting the color changing speed of the color changing film 100, and even affecting the color changing effect of the color changing film 100 between the second color and the first color.

[0102] Optionally, when the elastic particles 30 are in the second state, the maximum thickness h of the elastic support member 40 along the stacking direction of the first film layer 10 and the second film layer 50 is 20 The maximum thickness h of the elastic particles 30 10 When the elastic particles 30 are in the second state, the maximum thickness h of the elastic support member 40 is 0.95 to 1.05. 20 The maximum thickness h of the elastic particles 30 10 The maximum thickness h of the elastic support member 40 is equal to that of the color-changing film 100. 20 The maximum thickness h of the elastic particles 3010 When the ratio is less than 0.95, when the color-changing film 100 needs to present a second color, the elastic support member 40 will also pull the first film layer 10 and the second film layer 50 to slightly squeeze the elastic particles 30, so that the coverage area of ​​the elastic particles 30 increases, affecting the presentation of the second color. When the maximum thickness h of the elastic support member 40 is 20 The maximum thickness h of the elastic particles 30 10 When the ratio is greater than 1.05, when the color-changing film 100 changes from the second color to the first color, a greater force is required to compress the elastic support member 40 so that the elastic particles 30 cover the entire first film layer 10, which will reduce the life of the elastic support member 40. Alternatively, even if the elastic support member 40 is compressed to the maximum limit, the elastic particles 30 cannot cover the entire first film layer 10, and the first color of the second color-changing film 100 is presented.

[0103] Please see again Figure 8 Optionally, when the elastic particles 30 are in the second state, along the stacking direction of the first film layer 10 and the second film layer 50, the maximum thickness h of the elastic support member 40 is 20 The range is 5μm≤h 20 ≤70μm; specifically, it can be but not limited to 5μm, 10μm, 15μm, 20μm, 25μm, 30μm, 35μm, 40μm, 45μm, 50μm, 55μm, 60μm, 65μm, 70μm, etc. When the thickness of the elastic support member 40 is less than 5 μm, when the color-changing film 100 needs to present the second color, the elastic support member 40 will also pull the first film layer 10 and the second film layer 50 to slightly squeeze the elastic particles 30, so that the coverage area of ​​the elastic particles 30 increases, affecting the presentation of the second color. When the thickness of the elastic support member 40 is greater than 70 μm, when the color-changing film 100 changes from the second color to the first color, a greater force is required to compress the elastic support member 40 so that the elastic particles 30 can cover the entire first film layer 10. This will reduce the life of the elastic support member 40. Alternatively, even if the elastic support member 40 is compressed to the maximum limit, the elastic particles 30 cannot cover the entire first film layer 10, affecting the presentation of the first color.

[0104] Optionally, the elastic support member 40 includes at least one of a silicone support member and a rubber support member. Compared with the rubber support member, the silicone support member as the elastic support member 40 has better chemical stability, so the use of the silicone support member can make the color-changing film 100 have a longer color-changing life.

[0105] Optionally, the glass transition temperature (Tg) of the elastic support member 40 is less than 20°C; for example, it can be 19°C, 10°C, 0°C, -10°C, -20°C, -50°C, -80°C, etc. Further, the glass transition temperature (Tg) of the elastic support member 40 is less than 0°C. Furthermore, the glass transition temperature (Tg) of the elastic support member 40 is less than -30°C. When the color-changing film 100 is used, the temperature is at room temperature. When the glass transition temperature is higher than 20°C, the glass transition temperature is close to room temperature. At this time, the elastic support member 40 is between the glass state and the highly elastic state or has just changed from the glass state to the highly elastic state. The elasticity of the elastic support member 40 is relatively small. When changing from the second color to the first color, the elastic support member 40 deforms slowly or even cannot deform, which ultimately causes the color-changing film 100 to change color slowly, or even cannot change color until half of the color change (that is, the first color and the second color coexist). The lower the glass transition temperature of the elastic support member 40 , the better the elasticity of the elastic support member 40 at room temperature, the faster the color changing speed of the color changing film 100 , and the better the color changing performance.

[0106] Figure 10 This is another embodiment of the color-changing film edge of the present application Figure 1 Schematic diagram of the local cross-sectional structure along the AA direction, wherein the elastic particles are in the second state. Figure 11 This is another embodiment of the color-changing film edge of the present application Figure 1 Schematic diagram of the local cross-sectional structure along the AA direction, wherein the elastic particles are in the second state.

[0107] See Figure 10 and Figure 11 The color-changing film 100 further includes a cover bottom layer 70 , which is disposed on a side of the second film layer 50 away from the first film layer 10 , and has a second color.

[0108] The cover layer 70 is formed by spraying and curing ink having a second color. When the color-changing film 100 includes the cover layer 70 and the plurality of elastic particles 30 are in the second state, the first film layer 10 side of the color-changing film 100 reveals the second color, i.e., the color of the cover layer 70. The thickness of the cover layer 70 is 5 μm to 50 μm. Specifically, the thickness of the cover layer 70 can be, but is not limited to, 5 μm, 8 μm, 10 μm, 12 μm, 15 μm, 18 μm, 20 μm, 22 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, etc. Optionally, the cover layer 70 can be a single layer or multiple layers, for example, a stacked arrangement of 2, 3, 4, or 5 layers. Compared to a single cover layer 70, when the cover layer 70 is multiple layers, the first film layer 10 side of the color-changing film 100 can reveal a purer second color, i.e., without any mixed colors. In one embodiment, the color of the cover layer 70 is white.

[0109] The color-changing film 100 of the embodiment of the present application can be prepared by the method of the following embodiment of the present application. In addition, it can also be prepared by other methods. The preparation method of the embodiment of the present application is only one preparation method of the color-changing film 100 of the present application and should not be understood as a limitation on the color-changing film 100 provided by the embodiment of the present application.

[0110] See Figure 12 and Figure 13 , Figure 12 This is a schematic diagram of the preparation process of the color-changing film according to an embodiment of the present application. Figure 13 This is a schematic structural diagram corresponding to the process flow of a method for preparing a color-changing film according to an embodiment of the present application. The preparation method includes:

[0111] S201, provide a substrate mold 100' (such as Figure 14 As shown), the substrate mold 100' has a plurality of grooves 31' arranged at intervals;

[0112] See Figure 14 , Figure 14 The substrate mold 100' comprises a stacked substrate layer 10' and a glue layer 30', wherein the surface of the glue layer 30' away from the substrate layer 10' has a plurality of grooves 31' spaced apart.

[0113] Optionally, the groove 31' may be in various shapes, such as spherical, hemispherical, ellipsoidal, hemiellipsoidal, pyramidal, or prism-shaped. The distance w' between the two most distant points on the groove 31' is in the range of 5 μm ≤ w' ≤ 100 μm; specifically, it may be, but is not limited to, 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm, or 100 μm. The maximum depth h' of the groove 31' is in the range of 5μm≤h'≤70μm; specifically, it can be but not limited to 5μm, 10μm, 15μm, 20μm, 25μm, 30μm, 35μm, 40μm, 45μm, 50μm, 55μm, 60μm, 65μm, 70μm, etc.

[0114] See Figure 15 and Figure 16 , Figure 15 This is a flow chart of preparing a substrate mold according to an embodiment of the present application. Figure 16 1 is a schematic structural diagram corresponding to the preparation process of a substrate mold according to an embodiment of the present application. The substrate mold 100' of the present application is prepared by the following steps:

[0115] S2011, providing a substrate layer 10';

[0116] Optionally, the substrate layer 10 ′ may be, but is not limited to, one or more of polymethyl methacrylate, polycarbonate, polyethylene terephthalate, and the like.

[0117] S2012, coating a layer of adhesive on the substrate layer 10';

[0118] Optionally, a layer of epoxy resin glue is sprayed or scraped on the substrate layer 10 ′, and the solvent is removed to form an adhesive layer.

[0119] S2013, using a textured mold, transfer a plurality of grooves 31' on the adhesive layer; and

[0120] Optionally, the texture mold can be prepared by CNC processing, or exposure and development processes.

[0121] S2014 , curing is performed to form the glue layer into a glue layer 30 ′, and the texture mold is removed to obtain a substrate mold 100 ′.

[0122] Optionally, the curing may be ultraviolet curing or thermal curing, and the specific curing method is not specifically limited in this application. The glue layer 30' is an epoxy resin glue layer.

[0123] S202, filling the plurality of grooves 31' with a first glue solution;

[0124] Optionally, a layer of first glue having a first color (eg, black) is scraped onto the surface of the substrate mold 100 ′ having the plurality of grooves 31 ′, so that each groove 31 ′ is filled with the first glue.

[0125] Optionally, the first glue may be, but is not limited to, one or more of liquid silicone and liquid rubber.

[0126] S203, disposing a first film layer 10 on the surface of the plurality of grooves 31' having the first glue;

[0127] Specifically, the first film layer 10 is attached to the surface of the substrate mold 100 ′ having the first glue.

[0128] S204, performing a first curing to form the first glue into a plurality of elastic particles 30, and removing the substrate mold 100', wherein the plurality of elastic particles 30 have a first color; and

[0129] Optionally, a first curing is performed to cause the first glue to undergo a cross-linking reaction to form highly elastic elastic particles 30, and a solvent is used to dissolve the glue layer 30' to remove the substrate mold 100' to form an intermediate membrane. The intermediate membrane includes a first membrane and a plurality of elastic particles 30 spaced apart on the surface of the first membrane, and the elastic particles 30 have a first color.

[0130] Optionally, the first curing may be ultraviolet curing or thermal curing, and the specific curing method is not specifically limited in this application. The solvent for dissolving the glue layer may be at least one of acetone and xylene.

[0131] For detailed description of the first diaphragm and the elastic particles 30 , please refer to the corresponding description of the above embodiment, which will not be repeated here.

[0132] S205 , disposing a second film layer 50 on a side of the plurality of elastic particles 30 away from the first film layer 10 to obtain a color-changing film 100 .

[0133] Specifically, the second film layer 50 is stacked on the side of the multiple elastic particles 30 away from the first film layer 10 to obtain the color-changing film 100; when the multiple elastic particles 30 are in the first state, the positive projection area of ​​the elastic particles 30 on the first film layer 10 is the first area S1, and the color-changing film 100 shows the first color; when the multiple elastic particles 30 are in the second state, the positive projection area of ​​the elastic particles 30 on the first film layer 10 is the second area S2, and the color-changing film 100 shows the second color, wherein 25≤S1:S2≤100, and the second color is different from the first color.

[0134] For detailed descriptions of the second film layer 50 and the color-changing film 100 , please refer to the descriptions of the corresponding parts of the above embodiments, which will not be repeated here.

[0135] The color-changing film 100 prepared by the preparation method of the embodiment of the present application includes a plurality of elastic particles 30. When the plurality of elastic particles 30 are in a first state, the orthographic projection area of ​​the elastic particles 30 on the first film layer 10 is a first area S1, and the color-changing film 100 shows a first color; when the plurality of elastic particles 30 are in a second state, the orthographic projection area of ​​the elastic particles 30 on the first film layer 10 is a second area, and the color-changing film 100 shows a second color S2, wherein 25≤S1:S2≤100, and the second color is different from the first color. Thus, when the plurality of elastic particles 30 are in the first state, the first film layer 10 is substantially covered by the elastic particles 30, so that the color-changing film 100 reveals the first color of the elastic particles 30. When the plurality of elastic particles 30 are in the second state, the area occupied by the elastic particles 30 on the surface of the first film layer 10 is very small and is almost invisible to the naked eye. The color-changing film 100 exhibits the color of the film layer on the side of the first film layer 10 or the second film layer 50. As a result, the color-changing film 100 can change color between the first color and the second color, thereby having a color-changing function. In addition, the elastic particles 30 of the present application are insensitive to water and oxygen, and do not require a complex packaging structure and an expensive water and oxygen barrier film. This can also extend the service life of the color-changing film 100 and greatly reduce the production cost of the color-changing film 100.

[0136] See Figure 17 , Figure 17This is a flow chart of a method for preparing a color-changing film according to another embodiment of the present application. The preparation method includes:

[0137] S301, providing a substrate mold 100', wherein the substrate mold 100' has a plurality of grooves 31' arranged at intervals;

[0138] S302, filling the first glue into the plurality of grooves 31';

[0139] S303, disposing a first film layer 10 on the surface of the plurality of grooves 31' having the first glue;

[0140] S304, performing a first curing to form the first glue into a plurality of elastic particles 30, and removing the substrate mold 100', the elastic particles 30 having a first color;

[0141] For detailed description of steps S301 to S304 , please refer to the description of the corresponding parts of the above embodiment, which will not be repeated here.

[0142] S305 , printing a second adhesive on the outer periphery of the surface of the first film layer 10 facing the plurality of elastic particles 30 , so that the second adhesive surrounds the plurality of elastic particles 30 ;

[0143] Optionally, the second adhesive is printed on the outer periphery of the surface of the first film layer 10 facing the plurality of elastic particles 30 by screen printing, printing, curtain coating, etc., so that the second adhesive surrounds the plurality of elastic particles 30 .

[0144] Optionally, the second glue may be, but is not limited to, one or more of liquid silicone and liquid rubber.

[0145] S306 , disposing a second film layer 50 on a side of the plurality of elastic particles 30 away from the first film layer 10 ; and

[0146] For a detailed description of step S306, please refer to the description of the corresponding part of the above embodiment, which will not be repeated here.

[0147] S307, perform a second curing to make the second glue form an elastic support member 40, the opposite ends of the elastic support member 40 are respectively connected to the first film layer 10 and the second film layer 50, and are used to encapsulate multiple elastic particles 30 between the first film layer 10 and the second film layer 50 to obtain a color-changing film 100.

[0148] Optionally, a second curing is performed to cause the second glue to undergo a cross-linking reaction to form a highly elastic elastic support member 40. The opposite ends of the elastic support member 40 are respectively connected to the first film layer 10 and the second film layer 50, and are used to encapsulate the plurality of elastic particles 30 between the first film layer 10 and the second film layer 50 to obtain a color-changing film 100. When the plurality of elastic particles 30 are in the first state, the orthographic projection area of ​​the elastic particles 30 on the first film layer 10 is the first area S1, and the color-changing film 100 shows a first color; when the plurality of elastic particles 30 are in the second state, the orthographic projection area of ​​the elastic particles 30 on the first film layer 10 is the second area S2, and the color-changing film 100 shows a second color, wherein 25≤S1:S2≤100, and the second color is different from the first color.

[0149] Optionally, the second curing may be ultraviolet curing or thermal curing, and the specific curing method is not specifically limited in this application.

[0150] For detailed description of the features that are the same between this embodiment and the above embodiment, please refer to the above embodiment, which will not be repeated here.

[0151] See Figure 18 , Figure 18 This is a flow chart of a method for preparing a color-changing film according to another embodiment of the present application. The preparation method includes:

[0152] S401, providing a substrate mold 100', wherein the substrate mold 100' has a plurality of grooves 31' arranged at intervals;

[0153] S402, filling the plurality of grooves 31' with a first glue solution;

[0154] S403, disposing a first film layer 10 on the surface of the plurality of grooves 31' having the first glue;

[0155] S404, performing a first curing to form the first glue into a plurality of elastic particles 30, and removing the substrate mold 100', the elastic particles 30 having a first color;

[0156] S405 , printing a second adhesive on the outer periphery of the surface of the first film layer 10 facing the plurality of elastic particles 30 , so that the second adhesive surrounds the plurality of elastic particles 30 ;

[0157] S406 , disposing a second film layer 50 on a side of the plurality of elastic particles 30 away from the first film layer 10 ;

[0158] S407, performing a second curing to form the second adhesive into an elastic support member 40, wherein opposite ends of the elastic support member 40 are respectively connected to the first film layer 10 and the second film layer 50, so as to encapsulate the plurality of elastic particles 30 between the first film layer 10 and the second film layer 50; and

[0159] For detailed description of steps S401 to S407, please refer to the description of the corresponding parts of the above embodiment, which will not be repeated here.

[0160] S408 , forming a cover layer 70 on the surface of the second film layer 50 away from the first film layer 10 to obtain the color-changing film 100 .

[0161] Optionally, a cover ink having a second color is sprayed on the surface of the second film layer 50 away from the first film layer 10, and the cover ink is cured to form a cover bottom layer 70. When the plurality of elastic particles 30 are in the first state, the orthographic projection area of ​​the elastic particles 30 on the first film layer 10 is a first area S1, and the color-changing film 100 displays the first color; when the plurality of elastic particles 30 are in the second state, the orthographic projection area of ​​the elastic particles 30 on the first film layer 10 is a second area S2, and the color-changing film 100 displays the second color, wherein 25≤S1:S2≤100, and the second color is different from the first color.

[0162] For detailed description of the cover bottom layer and the second color, please refer to the description of the corresponding parts of the above embodiment, which will not be repeated here.

[0163] See Figure 19 and Figure 20 , Figure 19 It is a structural schematic diagram of a shell according to an embodiment of the present application. Figure 20 The shell of one embodiment of the present application is along Figure 19 The present embodiment further provides a housing 500 , which includes a housing body 510 , an adhesive layer 530 , and the color-changing film 100 of the present embodiment, which are sequentially stacked. The color-changing film 100 is adhered to the surface of the housing body 510 via the adhesive layer 530 .

[0164] In some embodiments, the first film layer 10 is closer to the housing body 510 than the second film layer 50. In another embodiment, the second film layer 50 is closer to the housing body 510 than the first film layer 10. The specific sides of the first film layer 10 and the second film layer 50 facing the housing body 510 are not specifically limited in this application and can be designed based on the actual application scenario, the desired appearance effect, etc.

[0165] For a detailed description of the color-changing film 100 , please refer to the description of the corresponding part of the above embodiment, which will not be repeated here.

[0166] The housing 500 of the embodiment of the present application can be applied to portable electronic devices such as mobile phones, tablet computers, laptop computers, desktop computers, smart bracelets, smart watches, e-readers, and game consoles. The housing 500 of the embodiment of the present application can be a 2D structure, a 2.5D structure, a 3D structure, etc. The housing 500 of the present application can be a middle frame, a back cover (battery cover), a decorative piece, etc. of an electronic device. In the embodiments and drawings of the present application, the housing 500 is described and illustrated in detail using the housing 500 of a mobile phone as an example, and is not to be understood as a limitation on the housing 500 of the present application.

[0167] In some embodiments, the material of the housing body 510 may be, but is not limited to, one or more of inorganic glass or resin. Alternatively, the resin may be, for example, one or more of polymethyl methacrylate, polycarbonate, or polyethylene terephthalate. Optionally, the housing body 510 is translucent, and the transmittance of the housing body 510 may be greater than or equal to 85%. Furthermore, the transmittance of the housing body 510 may be greater than or equal to 90%. Specifically, the transmittance of the housing body 510 may be, but is not limited to, 85%, 88%, 90%, 93%, 95%, 97%, 98%, 99%, or the like.

[0168] Optionally, the thickness of the housing body 510 is 0.3 mm to 1 mm; specifically, the thickness of the housing body 510 can be, but is not limited to, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, etc. If the housing body 510 is too thin, it may not provide adequate support and protection, and its mechanical strength may not meet the requirements of the electronic device housing 500. If the housing body 510 is too thick, it may increase the weight of the electronic device, affecting the feel of the electronic device and resulting in a poor user experience.

[0169] Optionally, the adhesive layer 530 may be, but is not limited to, an adhesive with adhesive properties such as hot melt adhesive, UV glue, optical glue (OCA glue), etc.

[0170] For detailed description of the features that are the same between this embodiment and the above embodiment, please refer to the above embodiment, which will not be repeated here.

[0171] See Figures 21 to 23 , Figure 21 It is a schematic structural diagram of an electronic device according to an embodiment of the present application. Figure 22 It is a schematic diagram of a partial exploded structure of an electronic device according to an embodiment of the present application. Figure 23This is a circuit block diagram of an electronic device according to an embodiment of the present application. This embodiment of the present application also provides an electronic device 600, which includes a display assembly 610, a housing 500 according to an embodiment of the present application, and a circuit board assembly 630. The display assembly 610 is used for display; the housing 500 is disposed on one side of the display assembly 610; and the circuit board assembly 630 is disposed between the display assembly 610 and the housing 500. The circuit board assembly 630 is electrically connected to the display assembly 610 and is used to control the display of the display assembly 610 and the color change of the color-changing film 100.

[0172] The electronic device 600 in the embodiment of the present application may be, but is not limited to, a portable electronic device such as a mobile phone, a tablet computer, a laptop computer, a desktop computer, a smart bracelet, a smart watch, an e-reader, a game console, or the like.

[0173] For a detailed description of the housing 500 , please refer to the description of the corresponding part of the above embodiment, which will not be repeated here.

[0174] Optionally, the color-changing film 100 can be located on the outer surface of the shell 500, that is, on the surface of the shell 500 facing away from the display component 610, or on the inner surface of the shell 500, that is, on the surface of the shell 500 facing the display component 610. This application does not make specific limitations.

[0175] Optionally, the display component 610 may be, but is not limited to, one or more of a liquid crystal display component, a light emitting diode display component (LED display component), a micro light emitting diode display component (MicroLED display component), a sub-millimeter light emitting diode display component (MiniLED display component), an organic light emitting diode display component (OLED display component), etc.

[0176] See Figure 23 Optionally, the circuit board assembly 630 may include a processor 631 and a memory 633. The processor 631 is electrically connected to the display assembly 610, the memory 633, and the color-changing film 100. The processor 631 is used to control the display of the display assembly 610 and the color change of the color-changing film 100. The memory 633 is used to store program code required for the operation of the processor 631, the program code required to control the display assembly 610, and the display content of the display assembly 610.

[0177] Optionally, the processor 631 includes one or more general-purpose processors 631, wherein the general-purpose processor 631 can be any type of device capable of processing electronic instructions, including a central processing unit (CPU), a microprocessor, a microcontroller, a main processor, a controller, and an ASIC. The processor 631 is used to execute various types of digital storage instructions, such as software or firmware programs stored in the memory 633, which enables the computing device to provide a wide variety of services.

[0178] Optionally, the memory 633 may include volatile memory, such as random access memory (RAM); the memory 633 may also include non-volatile memory (NVM), such as read-only memory (ROM), flash memory (FM), hard disk drive (HDD), or solid-state drive (SSD). The memory 633 may also include a combination of the above types of memory.

[0179] See Figure 24 and Figure 25 , Figure 24 This is a schematic diagram of a partial exploded structure of an electronic device according to another embodiment of the present application. Figure 25 This is a circuit block diagram of an electronic device according to another embodiment of the present application. In this embodiment, the color-changing film 100 changes color between a first color and a second color by being subjected to external compressive force and opposing forces. The electronic device 600 further includes a drive mechanism 640, which is disposed between the display assembly 610 and the housing 500 and is used to drive the first film layer 10 and the second film layer 50 to move toward or away from each other to achieve the change between the first color and the second color. For detailed descriptions of the color change process, please refer to the corresponding sections above and will not be repeated here. The drive mechanism 640 may be, but is not limited to, a drive motor, a lead screw motor, or the like.

[0180] Please see again Figure 23In this embodiment, when the color-changing film 100 loads voltage through the first conductive layer 11 and the second conductive layer 51 to achieve the color change between the first color and the second color, the processor 631 is also electrically connected to the first conductive layer 11 and the second conductive layer 51 respectively (that is, the processor 631 is electrically connected to the color-changing film 100, or the processor 631 is electrically connected to the shell 500), and is used to load the same polarity or different polarity voltage on the first conductive layer 11 and the second conductive layer 51 to make the first film layer 10 and the second film layer 50 move toward or away from each other to achieve the change between the first color and the second color. For the detailed color change process, please refer to the description of the corresponding part above and will not be repeated here.

[0181] Please see again Figure 22 and Figure 23 In some embodiments, the electronic device of the present application further includes a middle frame 620 and a camera module 650. The middle frame 620 is disposed between the display assembly and the housing 500, with the side of the middle frame 620 exposed to the housing 500 and the display assembly 610. The middle frame 620 and the housing 500 enclose a housing space for accommodating the circuit board assembly 630 and the camera module 650. The camera module 650 is electrically connected to the processor 631 and is configured to capture images under the control of the processor 631.

[0182] Optionally, the housing 500 includes a light-transmitting portion 501, through which the camera module 650 can capture images. That is, the camera module 650 in this embodiment is a rear-facing camera module 650. It will be appreciated that in other embodiments, the light-transmitting portion 501 may be disposed on a display screen, that is, the camera module 650 is a front-facing camera module 650. In the schematic diagram of this embodiment, the light-transmitting portion 501 is illustrated as an opening. In other embodiments, the light-transmitting portion 501 may not be an opening, but may be made of a light-transmitting material, such as plastic or glass.

[0183] It can be understood that the electronic device in this embodiment is merely a form of electronic device used by the shell 500, and should not be understood as a limitation on the electronic device provided by this application, nor should it be understood as a limitation on the shell 500 provided in each embodiment of this application.

[0184] Mentioning "embodiments" and "implementation methods" in this application means that the specific features, structures or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrases in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments. In addition, it should be understood that the features, structures or characteristics described in the various embodiments of the present application can be arbitrarily combined to form another embodiment that does not deviate from the spirit and scope of the technical solution of the present application, unless there is a contradiction between them.

[0185] Finally, it should be noted that the above implementation modes are only used to illustrate the technical solutions of the present application and are not intended to limit them. Although the present application has been described in detail with reference to the above preferred implementation modes, those skilled in the art should understand that modifications or equivalent replacements of the technical solutions of the present application should not depart from the spirit and scope of the technical solutions of the present application.

Claims

1. A color-changing film, characterized in that: include: first film layer; multiple elastic particles; The plurality of elastic particles are spaced apart and arranged on one side of the first film layer, and the plurality of elastic particles have a first color; as well as a second film layer, the second film layer being disposed on a side of the plurality of elastic particles facing away from the first film layer; When the plurality of elastic particles are in a first state, the orthographic projection area of ​​the elastic particles on the first film layer is a first area S1, and the color-changing film displays the first color; when the plurality of elastic particles are in a second state, the orthographic projection area of ​​the elastic particles on the first film layer is a second area S2, and the color-changing film displays a second color, wherein 25≤S1:S2≤100, and the second color is different from the first color; when the plurality of elastic particles are in the first state, two adjacent elastic particles abut or partially overlap; When the elastic particles change from the second state to the first state, the multiple elastic particles are compressed and elastically deformed, so that the color-changing film shows the first color; when the elastic particles change from the first state to the second state, the multiple elastic particles deform and recover, so that the color-changing film shows the second color.

2. The color-changing film according to claim 1, characterized in that: The first film layer includes a first conductive layer, and the second film layer includes a second conductive layer; when the first conductive layer and the second conductive layer are charged with different charges so that the first film layer and the second film layer are at a first distance, the plurality of elastic particles are in a first state; When the first conductive layer and the second conductive layer are charged with the same charge so that there is a second distance between the first film layer and the second film layer, the plurality of elastic particles are in a second state, wherein the second distance is greater than the first distance.

3. The color-changing film according to claim 1, characterized in that: The compressive strain ε1 of the elastic particles is ≥90%.

4. The color-changing film according to claim 1, characterized in that: The Shore hardness HA1 of the elastic particles is in the range of 5A≤HA1≤20A.

5. The color-changing film according to claim 1, characterized in that: When the elastic particle is in the second state, the distance w between the two farthest points of the elastic particle on the orthographic projection of the first film layer is in the range of: 5 μm ≤ w ≤ 100 μm; when the elastic particle is in the second state, the maximum thickness h of the elastic particle along the stacking direction of the first film layer and the second film layer is 10 The range is 5μm≤h 10 ≤70μm.

6. The color-changing film according to claim 1, characterized in that: When the elastic particles are in the second state, the shortest distance d between any two adjacent elastic particles is in the range of 25 μm≤d≤1 mm.

7. The color-changing film according to claim 1, characterized in that: The color-changing film further includes an elastic support member, which is disposed between the first film layer and the second film layer and surrounds the plurality of elastic particles. The opposite ends of the elastic support member are respectively connected to the first film layer and the second film layer.

8. The color-changing film according to claim 7, characterized in that: The Shore hardness HA2 of the elastic support member is greater than the Shore hardness HA1 of the elastic particles, and the Shore hardness HA2 of the elastic support member is in the range of 10A≤HA2≤30A.

9. The color-changing film according to claim 7, characterized in that: The compressive strain ε2 of the elastic support member is ≥ 90%; when the elastic particles are in the second state, the maximum thickness h of the elastic support member along the stacking direction of the first film layer and the second film layer is 20 The maximum thickness h of the elastic particles 10 The ratio range is 0.95 to 1.05; the maximum thickness h of the elastic support member 20 The range is 5μm≤h 20 ≤70μm.

10. The color-changing film according to claim 7, characterized in that: The first film layer includes a first conductive layer, and the second film layer includes a second conductive layer; when the first conductive layer and the second conductive layer are loaded with opposite charges so that the first film layer and the second film layer are at a first distance, the elastic support member is in a compressed state and the multiple elastic particles are in a first state; when the first conductive layer and the second conductive layer are loaded with the same charge, or when neither the first conductive layer nor the second conductive layer is loaded with charge, at least under the action of the elastic restoring force of the elastic support member, the first film layer and the second film layer are at a second distance, and the multiple elastic particles are in a second state, wherein the second distance is greater than the first distance.

11. The color-changing film according to any one of claims 1 to 10, characterized in that: The color-changing film further includes a cover bottom layer, which is arranged on a side of the second film layer away from the first film layer, and has the second color.

12. The color-changing film according to claim 7, characterized in that: The elastic particles include at least one of silicone particles and rubber particles, and the glass transition temperature of the elastic particles is less than 20°C; the elastic support member is at least one of a silicone support member and a rubber support member, and the glass transition temperature of the elastic support member is less than 20°C.

13. A method for preparing a color-changing film, characterized in that: include: Providing a substrate mold, wherein the substrate mold has a plurality of grooves arranged at intervals; Filling the plurality of grooves with a first glue; Disposing a first film layer on the surfaces of the plurality of grooves having the first glue; Performing a first curing step to form the first glue into a plurality of elastic particles, and removing the substrate mold, wherein the plurality of elastic particles have a first color; as well as Disposing a second film layer on a side of the plurality of elastic particles away from the first film layer to obtain a color-changing film; When the plurality of elastic particles are in the first state, the orthographic projection area of ​​the elastic particles on the first film layer is a first area S1, and the color-changing film shows the first color; When the multiple elastic particles are in the second state, the positive projection area of ​​the elastic particles on the first film layer is a second area S2, and the color-changing film shows a second color, wherein 25≤S1:S2≤100, and the second color is different from the first color; when the multiple elastic particles are in the first state, any two adjacent elastic particles abut or partially overlap; when the elastic particles change from the second state to the first state, the multiple elastic particles are compressed and elastically deformed, so that the color-changing film shows the first color; when the elastic particles change from the first state to the second state, the multiple elastic particles undergo deformation recovery, so that the color-changing film shows the second color.

14. The method for preparing a color-changing film according to claim 13, wherein: The substrate mold includes a stacked substrate layer and a glue layer, wherein a surface of the glue layer away from the substrate layer has a plurality of grooves arranged at intervals, and removing the substrate mold includes: The glue layer is dissolved by a solvent to remove the substrate mold.

15. The method for preparing a color-changing film according to claim 14, characterized in that: The glue layer is an epoxy resin glue layer, and the solvent is at least one of acetone and xylene.

16. The method for preparing a color-changing film according to any one of claims 13 to 15, characterized in that: Before providing the second film layer on a side of the plurality of elastic particles away from the first film layer, the method further comprises: Printing a second glue on the outer periphery of the surface of the first film layer facing the plurality of elastic particles, wherein the second glue surrounds the plurality of elastic particles; After disposing the second film layer on a side of the plurality of elastic particles away from the first film layer, the method further includes: A second curing is performed to form the second glue into an elastic support member, wherein the elastic support member is used to encapsulate the plurality of elastic particles between the first film layer and the second film layer.

17. A housing, characterized in that: include: Shell body; an adhesive layer, the adhesive layer being disposed on a surface of the housing body; as well as The color-changing film according to any one of claims 1 to 12, wherein the color-changing film is bonded to the surface of the shell body through the adhesive layer.

18. An electronic device, characterized in that: include: Display component; The housing according to claim 17, wherein the housing is disposed on one side of the display assembly; as well as A circuit board assembly is provided between the housing and the display assembly. The circuit board assembly is electrically connected to the display assembly and the housing, respectively, and is used to control the display assembly to display and control the color-changing film to change color.

Images