Film layer structure and preparation method thereof, shell and electronic equipment

Abstract

The invention provides a film layer structure, a preparation method thereof, a shell and electronic equipment. The film layer structure comprises a substrate; the coating unit is arranged on the first surface of the base body; the film coating unit comprises a plurality of laminated film coating layers, the plurality of film coating layers comprise a film coating layer with first refracting power and a film coating layer with second refracting power, and the refractive index of the film coating layer with the first refracting power is larger than that of the film coating layer with the second refracting power. The coating unit is arranged on the first surface of the base body to form the film layer structure, light rays penetrate through the refractive index of the coating layer with the first refractive power and the coating layer with the second refractive power, the reflection light rays at different interfaces generate an interference effect, and large reflectivity and transmittance can be generated; the formed film layer structure has gloss texture and mild texture similar to those of ceramic, and can also present the appearance effect of various colors.

Description

Technical Field

[0001] The present disclosure relates to the technical field of electronic equipment, and in particular to a film structure and a preparation method thereof, a housing, and an electronic device. Background Art

[0002] At present, the materials commonly used for the back cover of electronic devices are mainly ceramics, glass, composite panels, glass fiber + leather, etc. Among them, ceramics have a unique glossy texture and can give people a jade-like touch, so high-end electronic devices tend to use ceramic back covers. However, the ceramic back cover is complex to shape and has a high production cost. Summary of the invention

[0003] In order to solve the problems existing in the related art, the present disclosure provides a film layer structure and a preparation method thereof, a housing, and an electronic device.

[0004] According to a first aspect of an exemplary embodiment of the present disclosure, a film layer structure is provided, the film layer structure comprising:

[0005] matrix;

[0006] A coating unit is arranged on the first surface of the substrate; the coating unit includes a plurality of stacked coating layers, the plurality of coating layers include a coating layer with a first refractive power and a coating layer with a second refractive power, and the refractive index of the coating layer with the first refractive power is greater than or equal to the refractive index of the coating layer with the second refractive power.

[0007] In some exemplary embodiments, the reflectivity of the film layer structure is 10%-50%; and / or the brightness of the film layer structure is 30-70.

[0008] In some exemplary embodiments, the refractive index of the coating layer having the first refractive power is greater than or equal to 1.60; the refractive index of the coating layer having the second refractive power is 1.33-1.60.

[0009] In some exemplary embodiments, the material of the coating layer having the first refractive power includes at least one of the following:

[0010] Niobium oxide, silicon nitrogen compounds, titanium dioxide, hafnium dioxide, aluminum oxide.

[0011] In some exemplary embodiments, the material of the coating layer having the second refractive power includes at least one of the following:

[0012] Silicon dioxide, silicon.

[0013] In some exemplary embodiments, the refractive indices of the coating layers having the first refractive power are the same or different; and / or

[0014] The refractive indexes of the coating layers having the second refractive power are the same or different.

[0015] In some exemplary embodiments, the plurality of coating layers at least include the coating layer with the first refractive power and the coating layer with the second refractive power which are stacked adjacent to each other.

[0016] In some exemplary embodiments, the coating unit includes 2-20 coating layers.

[0017] In some exemplary embodiments, the film layer structure further includes a connecting layer, and the connecting layer is disposed between the substrate and the coating unit.

[0018] In some exemplary embodiments, the connection layer includes silicon.

[0019] In some exemplary embodiments, the thickness of the connecting layer is 0.1 nm-5.0 nm.

[0020] In some exemplary embodiments, the film layer structure further includes an anti-fog layer, and the anti-fog layer is disposed between the substrate and the connecting layer.

[0021] In some exemplary embodiments, the material of the anti-fog layer includes at least one of the following:

[0022] Polyurethane, polyester, acrylic.

[0023] In some exemplary embodiments, the substrate includes a polyethylene terephthalate material.

[0024] In some exemplary embodiments, the thickness of the substrate is 30 μm-200 μm.

[0025] According to a second aspect of an exemplary embodiment of the present disclosure, a method for preparing a film layer structure is provided. The method is used to prepare the above-mentioned film layer structure, and the method comprises:

[0026] providing a substrate;

[0027] A coating unit is formed on the first surface of the substrate; the coating unit includes a plurality of stacked coating layers, the plurality of coating layers include a coating layer with a first refractive power and a coating layer with a second refractive power, and the refractive index of the coating layer with the first refractive power is greater than or equal to the refractive index of the coating layer with the second refractive power.

[0028] In some exemplary embodiments, the preparation method further comprises:

[0029] A connection layer is formed between the substrate and the coating unit.

[0030] In some exemplary embodiments, the preparation method further comprises:

[0031] An anti-fog layer is formed between the substrate and the connecting layer.

[0032] In some exemplary embodiments, forming a multi-layer stacked coating layer on the first surface of the substrate includes:

[0033] By means of a roll-to-roll vacuum coating process, a multi-layered coating layer is formed on the first surface of the substrate.

[0034] According to a third aspect of an exemplary embodiment of the present disclosure, there is provided a housing, the housing comprising:

[0035] Base material;

[0036] The film layer structure as described above is arranged on the substrate.

[0037] In some exemplary embodiments, the housing further comprises:

[0038] The bonding layer is arranged between the film layer structure and the substrate, and is used to bond the film layer structure and the substrate.

[0039] In some exemplary embodiments, the bonding layer includes optical adhesive.

[0040] In some exemplary embodiments, the optical adhesive includes at least one of the following:

[0041] Acrylic resin, plexiglass resin, silicone resin.

[0042] According to a fourth aspect of an exemplary embodiment of the present disclosure, an electronic device is provided. The electronic device includes the above-mentioned housing.

[0043] The beneficial effects of the present disclosure include but are not limited to: in the film structure provided by the present disclosure, the coating unit includes a multi-layered coating layer with a first refractive power and a coating layer with a second refractive power, the refractive index of the coating layer with the first refractive power is different from the refractive index of the coating layer with the second refractive power, the refractive index of the coating layer with the first refractive power is greater than or equal to the refractive index of the coating layer with the second refractive power, the light passes through the refractive index of the coating layer with the first refractive power and the coating layer with the second refractive power, and the reflected light at different interfaces produces an interference effect, which can produce a larger reflectivity and transmittance, and the coating unit is arranged on the first surface of the substrate, and the formed film structure has a glossy texture and a warm texture similar to ceramics. In one embodiment, it can also present a variety of color appearance effects.

[0044] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The accompanying drawings incorporated into the specification and constituting a part of the specification illustrate embodiments of the present disclosure and are used together with the description to explain the principles of the embodiments of the present disclosure. In these drawings, similar reference numerals are used to represent similar elements. The drawings described below are some embodiments of the present disclosure, rather than all embodiments. For those skilled in the art, other drawings can be obtained based on these drawings without paying creative work.

[0046] Figure 1 It is a schematic diagram of a method for preparing a film layer structure according to an exemplary embodiment of the present disclosure;

[0047] Figure 2 This is a schematic diagram of the structure of a film layer structure after coating a bonding layer according to an exemplary embodiment of the present disclosure;

[0048] Figure 3 This is a schematic diagram of the structure of a film layer structure after coating a bonding layer according to an exemplary embodiment of the present disclosure;

[0049] Figure 4 Schematic diagram of reflectivity curves of a structure 30 after coating a bonding layer on a film layer structure in Example 1 and a structure 40 after coating a bonding layer on a film layer structure in Example 2 according to an exemplary embodiment of the present disclosure;

[0050] Figure 5 This is a schematic diagram of the structure of a film layer structure after coating a bonding layer according to an exemplary embodiment of the present disclosure;

[0051] Figure 6 It is a schematic diagram of a reflectivity curve of a structure 50 after a bonding layer is coated on a film layer structure according to an exemplary embodiment of the present disclosure;

[0052] Figure 7 This is a schematic diagram of the structure of a film layer structure after coating a bonding layer according to an exemplary embodiment of the present disclosure;

[0053] Figure 8 It is a schematic diagram of a reflectivity curve of a structure 60 after a bonding layer is coated on a film layer structure according to an exemplary embodiment of the present disclosure;

[0054] Fig. 9 This is a schematic diagram of the structure of a film layer structure after coating a bonding layer according to an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solution and advantages of the present disclosure clearer, the technical solution of the present disclosure will be clearly and completely described in combination with the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure. It should be noted that the embodiments in the present disclosure and the features in the embodiments can be arbitrarily combined with each other without conflict.

[0056] Ceramics have a unique glossy texture that gives people a jade-like touch, so current high-end electronic devices tend to use ceramic back covers. However, ceramic back covers are complex to form, expensive to make, and the material itself is brittle and heavy. In addition, ceramic materials cannot present a transparent or colorful appearance.

[0057] Based on this, an exemplary embodiment of the present disclosure provides a film layer structure, which includes: a substrate; a coating unit, arranged on the first surface of the substrate; the coating unit includes a plurality of stacked coating layers, the plurality of coating layers include a coating layer with a first refractive power and a coating layer with a second refractive power, and the refractive index of the coating layer with the first refractive power is greater than or equal to the refractive index of the coating layer with the second refractive power.

[0058] The coating unit includes a coating layer with a first refractive power and a coating layer with a second refractive power that are stacked in multiple layers. The refractive index of the coating layer with the first refractive power is different from the refractive index of the coating layer with the second refractive power. The refractive index of the coating layer with the first refractive power is greater than or equal to the refractive index of the coating layer with the second refractive power. When the refractive index of the coating layer changes continuously (for example, when light continuously passes through two coating layers with different refractive indices), due to the interference effect of reflected light at different interfaces, a larger reflectivity and transmittance can be generated. The coating unit is set on the first surface of the substrate, and the formed film layer structure has a glossy texture and warm texture similar to ceramics, and it is also easy to achieve a variety of color appearance effects.

[0059] In the exemplary embodiment provided in the present disclosure, the reflectivity of the film layer structure is 10%-50%; the brightness of the film layer structure is 30-70.

[0060] The reflectivity of the film layer structure provided by the exemplary embodiment of the present disclosure is 10%-50%, and the reflectivity of light is good. The brightness (L value) of the film layer structure is 30-70, so that the film layer structure has a bright visual effect. Therefore, when the film layer structure is set on a substrate, such as on a glass surface, it can form a shell with a glossy texture and warm texture similar to ceramics.

[0061] In an exemplary embodiment provided by the present disclosure, the refractive index of the coating layer having the first refractive power is greater than or equal to 1.60; the refractive index of the coating layer having the second refractive power is 1.33-1.60.

[0062] The refractive index of the coating layer with the first refractive power is greater than or equal to 1.60, that is, the coating layer with the first refractive power is a high refractive index coating layer, the refractive index of the coating layer with the second refractive power is 1.33-1.60, that is, the coating layer with the second refractive power is a low refractive index coating layer, the high refractive index coating layer and the low refractive index coating layer are stacked, and when the light continuously passes through the stacked high refractive index coating layer and the low refractive index coating layer, due to the interference effect of the reflected light at different interfaces, a larger reflectivity and transmittance can be generated, and the coating unit is arranged on the first surface of the substrate, and the formed film layer structure has a glossy texture and a warm texture similar to ceramics, and can also present a variety of color appearance effects. It can be understood that in order to present the desired appearance effect, the stacking method of the high refractive index coating layer and the low refractive index coating layer can be set as needed, for example, the high refractive index coating layer and the low refractive index coating layer can be stacked in sequence, or multiple layers of high refractive index coating layers can be stacked first, and then multiple layers of low refractive index coating layers are arranged, which is not limited in the present disclosure.

[0063] In an exemplary embodiment provided by the present disclosure, the material of the coating layer having the first refractive power includes at least one of the following: niobium oxide, silicon nitride, titanium dioxide, hafnium dioxide, and aluminum oxide.

[0064] The refractive index of the coating layer with the first refractive power is greater than or equal to 1.60, which is a high refractive index coating layer. Therefore, the material of the coating layer with the first refractive power is selected from a high refractive index material, and in order to ensure the transmittance of the coating unit, the material of the coating layer with the first refractive power should also be a material that presents a transparent effect after coating. In the exemplary embodiment provided by the present disclosure, at least one of niobium oxide, nitrogen silicon compound, titanium dioxide, hafnium dioxide, and aluminum oxide is selected as the material of the coating layer with the first refractive power, which can form an insulating, non-conductive, high-transmittance, and first refractive power coating layer. Among them, niobium oxide can be Nb2O5, NbO2, Nb2O3, NbO; nitrogen silicon compound can be Si3N4, Si2N2, SiN.

[0065] In an exemplary embodiment provided by the present disclosure, the material of the coating layer having the second refractive power includes at least one of the following: silicon dioxide and silicon.

[0066] The refractive index of the coating layer with the second refractive power is 1.33-1.60, which is a low refractive index coating layer. Therefore, the material of the coating layer with the second refractive power is selected from a low refractive index material, and in order to ensure the transmittance of the coating unit, the material of the coating layer with the second refractive power should also be a material that presents a transparent effect after coating. In the exemplary embodiment provided in the present disclosure, at least one of silicon dioxide and silicon is selected as the material of the coating layer with the second refractive power, which can form an insulating and non-conductive coating layer with high transmittance and a second refractive power.

[0067] In the exemplary embodiments provided by the present disclosure, the refractive indexes of the coating layers having the first refractive power are the same or different; and / or the refractive indexes of the coating layers having the second refractive power are the same or different.

[0068] The refractive index of the coating layer with the first refractive power is greater than or equal to 1.60, and it is a high refractive index coating layer. The refractive index of the coating layer with the first refractive power can be the same or different. For example, the refractive index of the coating layer with the first refractive power is different, and can be a coating layer with a refractive index of 1.70, 2.70 or 3.20, for example, it can be different materials with different refractive indices; for another example, the refractive index of the coating layer with the first refractive power is the same, and can be different materials with the same refractive index, or can be the same material.

[0069] The refractive index of the coating layer with the second refractive power is 1.33-1.60, which is a low refractive index coating layer. The refractive index of the coating layer with the second refractive power can be the same or different. For example, the refractive index of the coating layer with the second refractive power is different, and can be a coating layer with a refractive index of 1.33, 1.45 or 1.60, for example, it can be different materials with different refractive indices; for another example, the refractive index of the coating layer with the second refractive power is the same, and can be different materials with the same refractive index, or can be the same material.

[0070] In an exemplary embodiment provided by the present disclosure, the multi-layer coating layer includes at least a coating layer with a first refractive power and a coating layer with a second refractive power which are adjacently stacked.

[0071] The coating layer with the first refractive power and the coating layer with the second refractive power are adjacent to each other and stacked. When light continuously passes through the coating layer with the first refractive power and the coating layer with the second refractive power, due to the interference effect of the reflected light at different interfaces, a larger reflectivity and transmittance can be generated. The coating unit is arranged on the first surface of the substrate, and the formed film layer structure has a glossy texture and warm texture similar to ceramics, and can also present an appearance effect with various colors.

[0072] In an exemplary embodiment provided by the present disclosure, the coating unit includes 2-20 coating layers.

[0073] The coating unit includes at least one coating layer with a first refractive power and one coating layer with a second refractive power, that is, the coating unit includes at least two coating layers, so that when light continuously passes through a coating layer with a first refractive power and a coating layer with a second refractive power, the reflected light at different interfaces generates an interference effect, resulting in a larger reflectivity and transmittance. The coating unit is arranged on the first surface of the substrate, and the film structure formed has a glossy texture and a warm texture similar to ceramics, and can also present an appearance effect with various colors. The more coating layers the coating unit includes, the more diverse reflection effects and textures can be achieved. However, considering the thickness of the film structure, the number of coating layers included in the coating unit should not be too many. Therefore, in the exemplary embodiment provided by the present disclosure, the number of coating layers included in the coating unit is controlled to be 2-20 layers.

[0074] In an exemplary embodiment provided by the present disclosure, the film layer structure further includes a connecting layer, and the connecting layer is disposed between the substrate and the coating unit.

[0075] When the coating layer adjacent to the substrate in the coating unit is made of metal oxide material, since the bonding strength between the metal oxide coating layer and the substrate is poor, a connecting layer needs to be set between the substrate and the coating unit to enhance the bonding strength between the substrate and the coating unit so that the coating unit is firmly attached to the first surface of the substrate.

[0076] In an exemplary embodiment provided by the present disclosure, the connection layer includes silicon.

[0077] The properties of silicon are between organic and inorganic substances, and it has good bonding strength with both the metal oxide coating layer and the substrate. Therefore, when the coating layer adjacent to the substrate in the coating unit is made of metal oxide material, a silicon connecting layer is provided between the substrate and the coating unit. This can enhance the bonding strength between the substrate and the coating unit, so that the coating unit is firmly attached to the first surface of the substrate.

[0078] In an exemplary embodiment provided by the present disclosure, the thickness of the connecting layer is 0.1 nm-5.0 nm.

[0079] Under the premise of ensuring the bonding force between the substrate and the coating unit, the thickness of the connecting layer between the substrate and the coating unit is as small as possible. In the exemplary embodiment provided in the present disclosure, the thickness of the connecting layer is limited to the range of 0.1nm-5.0nm, which can ensure the bonding force between the substrate and the coating unit, so that the coating unit is firmly attached to the first surface of the substrate.

[0080] In an exemplary embodiment provided by the present disclosure, the film layer structure further includes an anti-fog layer, and the anti-fog layer is disposed between the substrate and the connecting layer.

[0081] The anti-fog layer is arranged between the substrate and the connecting layer to ensure that the film structure is anti-fog and anti-dew, and to prevent the film structure from being mixed with water vapor during subsequent applications, which affects the transmittance and reflectivity of the film structure.

[0082] In the exemplary embodiments provided in the present disclosure, the material of the anti-fog layer includes at least one of the following: polyurethane, polyester, and acrylic resin.

[0083] Polyurethane, polyester and acrylic resin are all economical and effective anti-fog coatings. Using at least one of polyurethane, polyester and acrylic resin as the material of the anti-fog layer can ensure that the film structure is anti-fog and anti-dew, and avoid the film structure being mixed with water vapor during subsequent applications, which affects the transmittance and reflectivity of the film structure.

[0084] In an exemplary embodiment provided by the present disclosure, the thickness of the anti-fog layer is 0.5 μm-2 μm.

[0085] By setting a 0.5μm-2μm anti-fog layer between the substrate and the connecting layer, the film structure can be guaranteed to be anti-fog and anti-dew, and the film structure can be prevented from being mixed with water vapor during subsequent applications, which affects the transmittance and reflectivity of the film structure.

[0086] In an exemplary embodiment provided by the present disclosure, the substrate includes a polyethylene terephthalate material.

[0087] Polyethylene terephthalate (PET) material has high transparency and good gloss, and can form a film with low haze and high transmittance, for example, a film with a transmittance of more than 90%. Using this film as a matrix of a film structure can make the film structure present a transparent appearance; in addition, this film also has an anti-ultraviolet function, so that the matrix of the film structure has good weather resistance and reliability, avoiding the problem of aging, yellowing and brittleness of the polymer material matrix due to ultraviolet radiation during the application of the film structure.

[0088] In an exemplary embodiment provided by the present disclosure, the thickness of the substrate is 30 μm-200 μm.

[0089] The film formed by polyethylene terephthalate material is used as a substrate of the membrane layer structure, and the thickness of the substrate is in the range of 30μm-200μm. For example, the thickness of the substrate can be 30μm, 50μm, 100μm, or 200μm. The thickness of the substrate within this range can provide strength support for the membrane layer structure and avoid the transmittance of the membrane layer structure being affected by excessive thickness of the substrate.

[0090] The exemplary embodiment of the present disclosure provides a method for preparing a film layer structure, and the preparation method is used to prepare the film layer structure provided by the exemplary embodiment of the present disclosure, such as Figure 1 As shown, the preparation method comprises:

[0091] S100: providing a substrate;

[0092] S200: forming a coating unit on the first surface of the substrate; the coating unit includes a plurality of stacked coating layers, the plurality of coating layers include a coating layer with a first refractive power and a coating layer with a second refractive power, and the refractive index of the coating layer with the first refractive power is greater than or equal to the refractive index of the coating layer with the second refractive power.

[0093] A multi-layer coating layer is formed on the first surface of the substrate to obtain a film layer structure, wherein the multi-layer coating layer includes a coating layer with a first refractive power and a coating layer with a second refractive power, the refractive index of the coating layer with the first refractive power is different from the refractive index of the coating layer with the second refractive power, the refractive index of the coating layer with the first refractive power is greater than or equal to the refractive index of the coating layer with the second refractive power, when the refractive index of the coating layer changes continuously (for example, when light continuously passes through two coating layers with different refractive indices), due to the interference effect of reflected light at different interfaces, a larger reflectivity and transmittance can be generated, the reflectivity of the formed film layer structure is 10%-50%, the brightness (L value) is 30-70, it has a glossy texture and warm texture similar to ceramics, and can also present an appearance effect with various colors.

[0094] In an exemplary embodiment provided by the present disclosure, the preparation method further includes: forming a connecting layer between the substrate and the coating unit.

[0095] When the coating layer adjacent to the substrate in the coating unit is made of metal oxide material, since the bonding strength between the metal oxide coating layer and the substrate is poor, a connecting layer needs to be set between the substrate and the coating unit. For example, a connecting layer is formed on the first surface of the substrate through a vacuum coating process to enhance the bonding strength between the substrate and the coating unit, so that the coating unit is firmly attached to the first surface of the substrate.

[0096] In an exemplary embodiment provided by the present disclosure, a multi-layer stacked coating layer is formed on the first surface of a substrate, including: forming a multi-layer stacked coating layer on the first surface of the substrate through a winding vacuum coating process.

[0097] A substrate roll, such as a PET roll, is placed in a vacuum coating chamber, and a coating layer material is used as a target material to perform roll-to-roll vacuum coating to form a multi-layer stacked coating layer on the first surface of the substrate.

[0098] For example, a PET roll is placed in a vacuum coating chamber, and the material of the first coating layer is used as a target material to perform roll-to-roll vacuum coating to form a first coating layer on the first surface of the substrate; in the same chamber, the material of the second coating layer is used as a target material to perform roll-to-roll vacuum coating to form a second coating layer on the second surface of the first coating layer away from the substrate; in the same chamber, the material of the third coating layer is used as a target material to perform roll-to-roll vacuum coating to form the third coating layer on the third surface of the second coating layer away from the first coating layer, and so on, according to the preset number of coating layers, a plurality of stacked coating layers are formed on the first surface of the substrate.

[0099] An exemplary embodiment of the present disclosure provides a housing, the housing comprising: a substrate; and a film layer structure provided on the substrate as provided by the exemplary embodiment of the present disclosure.

[0100] The base material of the shell is a material with high transparency, such as glass. A film layer structure as provided in the exemplary embodiment of the present disclosure is arranged on the base material, such as a film layer structure as provided in the exemplary embodiment of the present disclosure is arranged in a preset area of ​​the base material, so that a shell similar to ceramic can be obtained. Since the film layer structure as provided in the exemplary embodiment of the present disclosure is arranged on the base material, the shell has a large reflectivity and transmittance, thereby forming a glossy texture and a warm texture similar to ceramics, and can also present an appearance effect with various colors. In addition, the shell is light in weight, the molding process is simpler than ceramics, and the production cost is lower than ceramics. When the shell is applied to the back cover of an electronic device, the glossy texture and jade-like touch of the shell can enhance the user experience.

[0101] In an exemplary embodiment provided in the present disclosure, the shell further includes: a bonding layer, which is arranged between the film layer structure and the substrate, and the bonding layer is used to bond the film layer structure and the substrate.

[0102] When the film layer structure provided by the exemplary embodiment of the present disclosure is set on a substrate, the substrate and the film layer structure need to be bonded together through an adhesive layer. For example, the adhesive layer bonds one side of the coating unit of the film layer structure to the substrate to form a shell.

[0103] In an exemplary embodiment provided by the present disclosure, the bonding layer includes optical adhesive.

[0104] Optical adhesive has high clarity, strong light transmittance, high adhesion, and no appearance defects. Therefore, using optical adhesive as a bonding layer to bond the film structure and the substrate can firmly bond the film structure and the substrate without affecting the transmittance of the shell.

[0105] In the exemplary embodiments provided in the present disclosure, the optical adhesive includes at least one of the following:

[0106] Acrylic resin glue, plexiglass glue, silicone glue.

[0107] Acrylic resin glue, organic glass glue, and silicone resin glue are all optical glues with high clarity, strong light transmittance, and high adhesion. Therefore, at least one of acrylic resin glue, organic glass glue, and silicone resin glue is used as an optical glue to bond the film structure and the substrate. The film structure and the substrate can be firmly bonded without affecting the transmittance of the shell.

[0108] In addition, anti-UV fillers can be added to optical adhesives to improve the weather resistance and reliability of the film structure.

[0109] In an exemplary embodiment provided by the present disclosure, the thickness of the adhesive layer is 15-100 μm.

[0110] A 15-100 μm adhesive layer is provided between the film structure and the substrate, so that the film structure and the substrate can be firmly bonded without affecting the transmittance of the shell.

[0111] The exemplary embodiments of the present disclosure provide an electronic device, which includes a housing provided by the exemplary embodiments of the present disclosure. The housing provided by the exemplary embodiments of the present disclosure has a large reflectivity and transmittance, and is a ceramic-like housing, having the glossy texture and warm texture of ceramics, and can also present a variety of color appearance effects. In addition, the housing is light in weight, the molding process is simpler than ceramics, and the production cost is lower than ceramics. When the housing is applied to electronic devices, such as the back cover of electronic devices, the user experience can be improved.

[0112] In order to more clearly explain the technical solution of the present disclosure, a specific example of the structure of the film layer structure provided by the exemplary embodiment of the present disclosure after being coated with an adhesive layer is given below.

[0113] Example 1

[0114] like Figure 2 As shown, the structure 30 after the film layer structure is coated with the adhesive layer includes:

[0115] PET substrate layer 301;

[0116] Anti-fog layer 302;

[0117] A silicon connecting layer 303 having a thickness of 0.1-1.0 nm to enhance the bonding between the PET substrate layer 301 and the niobium pentoxide layer 304;

[0118] Niobium pentoxide layer 304 (high refractive index layer), with a thickness of 15-25 nm;

[0119] Silicon dioxide layer 305 (low refractive index layer), with a thickness of 10-20 nm;

[0120] Niobium pentoxide layer 306 (high refractive index layer), with a thickness of 10-25 nm;

[0121] Optical adhesive layer 307 .

[0122] Example 2

[0123] like Figure 3 As shown, the structure 40 after the film layer structure is coated with the adhesive layer includes:

[0124] PET substrate layer 401;

[0125] Anti-fog layer 402;

[0126] A silicon connecting layer 403 having a thickness of 0.1-5.0 nm to enhance the bonding between the PET substrate layer 401 and the silicon nitride layer 404;

[0127] Silicon nitride layer 404 (high refractive index layer), with a thickness of 10-50 nm;

[0128] Silicon dioxide layer 405 (low refractive index layer), with a thickness of 10-50 nm;

[0129] Optical adhesive layer 406 .

[0130] The reflectivity curves of the structure 30 after the film layer structure in Example 1 is coated with the adhesive layer and the structure 40 after the film layer structure in Example 2 is coated with the adhesive layer are as follows: Figure 4 As shown, Figure 4 The horizontal axis represents wavelength, and the vertical axis represents reflectivity, wherein curve a is the refractive index curve of structure 30 after the film layer structure in Example 1 is coated with an adhesive layer, and curve b is the reflectivity curve of structure 40 after the film layer structure in Example 2 is coated with an adhesive layer.

[0131] Example 3

[0132] like Figure 5 As shown, the structure 50 after the film layer structure is coated with the adhesive layer includes:

[0133] PET substrate layer 501;

[0134] Anti-fog layer 502;

[0135] A silicon connecting layer 503 having a thickness of 0.1-5.0 nm to enhance the bonding between the PET substrate layer 501 and the silicon dioxide layer 504;

[0136] Silicon dioxide layer 504 (low refractive index layer), with a thickness of 10-200 nm;

[0137] Niobium pentoxide layer 505 (high refractive index layer), thickness 30-60nm;

[0138] Optical adhesive layer 506 .

[0139] Figure 6 The reflectivity curve of the structure 50 after the film layer structure is coated with the bonding layer is shown. Figure 6 The horizontal axis represents wavelength and the vertical axis represents reflectivity.

[0140] Example 4

[0141] like Figure 7 As shown, the structure 60 after the film layer structure is coated with the adhesive layer includes:

[0142] PET substrate layer 601;

[0143] Anti-fog layer 602;

[0144] A silicon connecting layer 603 having a thickness of 0.1-2.0 nm to enhance the bonding between the PET substrate layer 601 and the silicon dioxide layer 604;

[0145] Silicon dioxide layer 604, thickness 20-50 nm;

[0146] Niobium pentoxide layer 605 (high refractive index layer), thickness 1-10nm;

[0147] Silicon dioxide layer 606 (low refractive index layer), with a thickness of 50-150 nm;

[0148] Niobium pentoxide layer 607 (high refractive index layer), thickness 30-60nm;

[0149] Optical adhesive layer 608 (low refractive index layer).

[0150] Figure 8 Graph 60 shows the reflectivity curve of the structure 60 after the film layer structure is coated with the bonding layer. Figure 8 The horizontal axis represents wavelength and the vertical axis represents reflectivity.

[0151] Example 5

[0152] like Fig. 9 As shown, the structure 70 after the film layer structure is coated with the adhesive layer includes:

[0153] PET substrate layer 701;

[0154] Anti-fog layer 702;

[0155] A silicon connecting layer 703 having a thickness of 0.1-5.0 nm to enhance the bonding between the PET substrate layer 701 and the silicon dioxide layer 704;

[0156] Silicon dioxide layer 704 (low refractive index layer), with a thickness of 10-200 nm;

[0157] Titanium dioxide layer 705 (high refractive index layer), thickness 30-60 nm;

[0158] Optical adhesive layer 706.

[0159] It should be noted that the above embodiment only provides a partial stacking method rather than a complete stacking method. In fact, any stacking method can be performed according to the desired appearance effect of the film layer structure.

[0160] The contents described above may be implemented individually or in combination in various ways, and these variations are all within the protection scope of the present disclosure.

[0161] Finally, it should be noted that in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0162] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure is described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A film structure, characterized in that: The film layer structure comprises: matrix; A coating unit is arranged on the first surface of the substrate; the coating unit includes a plurality of stacked coating layers, the plurality of coating layers include a coating layer with a first refractive power and a coating layer with a second refractive power, and the refractive index of the coating layer with the first refractive power is greater than or equal to the refractive index of the coating layer with the second refractive power.

2. The film structure according to claim 1, characterized in that: The reflectivity of the film layer structure is 10%-50%; and / or the brightness of the film layer structure is 30-70.

3. The film structure according to claim 1, characterized in that: The refractive index of the coating layer with the first refractive power is greater than or equal to 1.60; the refractive index of the coating layer with the second refractive power is 1.33-1.

60.

4. The film structure according to claim 1, characterized in that: The material of the coating layer having the first refractive power includes at least one of the following: Niobium oxide, silicon nitrogen compounds, titanium dioxide, hafnium dioxide, aluminum oxide.

5. The film structure according to claim 4, characterized in that: The material of the coating layer having the second refractive power includes at least one of the following: Silicon dioxide, silicon.

6. The film structure according to claim 5, characterized in that: The refractive indexes of the coating layers having the first refractive power are the same or different; and / or The refractive indexes of the coating layers having the second refractive power are the same or different.

7. The film structure according to any one of claims 1 to 6, characterized in that: The multiple layers of coating layers at least include the coating layer with the first refractive power and the coating layer with the second refractive power which are adjacently stacked.

8. The film structure according to claim 1, characterized in that: The coating unit includes 2-20 coating layers.

9. The film structure according to claim 1, characterized in that: The film layer structure further includes a connecting layer, and the connecting layer is arranged between the substrate and the film coating unit.

10. The film structure according to claim 9, characterized in that: The connection layer includes silicon.

11. The film structure according to claim 9, characterized in that: The thickness of the connecting layer is 0.1 nm-5.0 nm.

12. The film structure according to claim 9, characterized in that: The film layer structure further includes an anti-fog layer, and the anti-fog layer is arranged between the substrate and the connecting layer.

13. The film structure according to claim 12, characterized in that: The material of the anti-fog layer includes at least one of the following: Polyurethane, polyester, acrylic.

14. The film structure according to claim 1, characterized in that: The substrate includes polyethylene terephthalate material.

15. The film structure according to claim 14, characterized in that: The thickness of the substrate is 30 μm-200 μm.

16. A method for preparing a film structure, characterized in that: The preparation method is used to prepare the film layer structure according to any one of claims 1 to 15, and the preparation method comprises: providing a substrate; A coating unit is formed on the first surface of the substrate; the coating unit includes a plurality of stacked coating layers, the plurality of coating layers include a coating layer with a first refractive power and a coating layer with a second refractive power, and the refractive index of the coating layer with the first refractive power is greater than or equal to the refractive index of the coating layer with the second refractive power.

17. The method for preparing a film structure according to claim 16, characterized in that: The preparation method further comprises: A connection layer is formed between the substrate and the coating unit.

18. The method for preparing a film structure according to claim 17, characterized in that: The preparation method further comprises: An anti-fog layer is formed between the substrate and the connecting layer.

19. The method for preparing a film structure according to claim 16, characterized in that: The method of forming a multi-layered coating layer on the first surface of the substrate comprises: By means of a roll-to-roll vacuum coating process, a multi-layered coating layer is formed on the first surface of the substrate.

20. A housing, characterized in that: The housing comprises: Base material; A film layer structure as claimed in any one of claims 1 to 15 arranged on the substrate.

21. The housing according to claim 20, characterized in that The housing further comprises: The bonding layer is arranged between the film layer structure and the substrate, and is used to bond the film layer structure and the substrate.

22. The housing according to claim 21, characterized in that The bonding layer includes optical adhesive.

23. The housing according to claim 22, characterized in that The optical adhesive comprises at least one of the following: Acrylic resin, plexiglass resin, silicone resin.

24. An electronic device, characterized in that: The electronic device comprises the housing described in any one of claims 20-23.

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