Optical Film, Housing, Terminal, and Preparation Method of Optical Film

Abstract

The present disclosure relates to an optical film, a housing, a terminal, and a method for preparing an optical film. Among them, the optical film includes a first optical layer having light transmissibility; a second optical layer, which is stacked with the first optical layer and is used to reflect the light passing through the first optical layer toward the first optical layer or transmit the light passing through the first optical layer. The present disclosure improves the three-dimensional sense of the texture of the texture layer by using the first optical layer and the second optical layer.

Description

Technical Field

[0001] The present disclosure relates to the technical field of terminals, and particularly to an optical film, a housing, a terminal, and a method for manufacturing an optical film. Background Art

[0002] When manufacturing terminals such as mobile phones, it is necessary to install film sheets to enrich the visual experience obtained by users. However, currently, most terminal film sheets adopt textures such as zero-dimensional lattices, one-dimensional lines, or two-dimensional graphics. The textures on such film sheets provide a single visual experience. After years of use of terminal products with such film sheets, the attractiveness of the products to users decreases, resulting in weakened product competitiveness and being unable to meet the changes and demands of the market. Summary of the Invention

[0003] The present disclosure provides an optical film, a housing, a terminal, and a method for manufacturing an optical film.

[0004] According to an embodiment of the first aspect of the present disclosure, there is provided an optical film, including:

[0005] The first optical layer has light transmissivity;

[0006] The second optical layer is stacked with the first optical layer and is configured to reflect the light passing through the first optical layer back to the first optical layer or transmit the light passing through the first optical layer.

[0007] In some embodiments, the optical film further includes:

[0008] The texture layer is located between the first optical layer and the second optical layer.

[0009] In some embodiments, the optical film further includes;

[0010] The transparent substrate, and the transparent substrate is located between the texture layer and the first optical layer.

[0011] In some embodiments, the optical film further includes:

[0012] The shielding layer, the light incident surface of the shielding layer faces the second optical layer, and the second optical layer is located between the texture layer and the shielding layer.

[0013] In some embodiments, the light transmissivity of the first optical layer is greater than that of the second optical layer; and / or,

[0014] The reflectivity of the second optical layer is greater than that of the first optical layer.

[0015] In some embodiments, the first optical layer and / or the second optical layer includes: two sub-layers that are alternately stacked and have different refractive indexes.

[0016] In some embodiments, the first optical layer includes a first sub-layer and a second sub-layer which are stacked and distributed, and the refractive indices of the first sub-layer and the second sub-layer are different;

[0017] and / or,

[0018] the second optical layer includes a third sub-layer and a fourth sub-layer which are stacked and distributed, and the refractive indices of the third sub-layer and the fourth sub-layer are different.

[0019] In some embodiments, the first optical layer includes a plurality of the first sub-layers and a plurality of the second sub-layers, and the first sub-layers and the second sub-layers are alternately distributed; and / or;

[0020] the second optical layer includes a plurality of the third sub-layers and a plurality of the fourth sub-layers, and the third sub-layers and the fourth sub-layers are alternately distributed.

[0021] In some embodiments, the light-shielding layer includes an ink layer.

[0022] In some embodiments, the material of the transparent substrate includes at least one of the following: polyethylene terephthalate, polyimide, polycarbonate, or flexible glass.

[0023] According to an embodiment of the second aspect of the present disclosure, there is provided a housing, including:

[0024] a transparent outer shell having an outer surface and an inner surface opposite to the outer surface; wherein, the outer surface is the light-incident surface of the transparent outer shell;

[0025] the optical film according to any one of the above embodiments, and the first optical layer faces the inner surface of the transparent outer shell.

[0026] According to an embodiment of the third aspect of the present disclosure, there is provided a terminal, including:

[0027] the housing according to any one of the above embodiments.

[0028] According to an embodiment of the third aspect of the present disclosure, there is provided a method for manufacturing an optical film, including:

[0029] forming a first optical layer;

[0030] forming a second optical layer which is stacked and distributed with the first optical layer;

[0031] wherein, the second optical layer is configured to reflect the light transmitted through the first optical layer towards the first optical layer, or transmit the light transmitted through the first optical layer.

[0032] In some embodiments, the method further includes:

[0033] Form a texture layer; wherein, the texture layer is located between the first optical layer and the first optical layer.

[0034] The method further includes:

[0035] Form the first optical layer on the first surface of the transparent substrate;

[0036] Form the texture layer on the second surface of the transparent substrate; wherein, the second surface is the opposite surface of the first surface.

[0037] In some embodiments, forming the texture layer on the second surface of the transparent substrate includes:

[0038] Print or transfer to form the texture layer on the second surface of the transparent substrate.

[0039] In some embodiments, the method further includes:

[0040] Form an occlusion layer; wherein, the light-incident surface of the occlusion layer faces the second optical layer, and the second optical layer is located between the first optical layer and the occlusion layer.

[0041] In some embodiments, forming the occlusion layer includes:

[0042] Form the occlusion layer by printing.

[0043] The method further includes:

[0044] Deposit to form the first optical layer and / or the second optical layer.

[0045] In some embodiments, forming the first optical layer includes:

[0046] Form a first sub-layer;

[0047] Form a second sub-layer stacked with the first sub-layer; wherein, the refractive indices of the first sub-layer and the second sub-layer are different;

[0048] And / or, forming the second optical layer includes:

[0049] Form a third sub-layer;

[0050] Form a fourth sub-layer stacked with the third sub-layer; wherein, the refractive indices of the third sub-layer and the fourth sub-layer are different.

[0051] In some embodiments, the first optical layer includes: a plurality of the first sub-layers and a plurality of the second sub-layers, and the first sub-layers and the second sub-layers are alternately distributed; and / or;

[0052] The second optical layer includes: a plurality of the third sub-layers and a plurality of the fourth sub-layers, and the third sub-layers and the fourth sub-layers are alternately distributed.

[0053] In some embodiments, the light transmittance of the first optical layer is greater than that of the second optical layer; and / or,

[0054] the reflectivity of the second optical layer is greater than that of the first optical layer.

[0055] The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects:

[0056] As can be seen from the above embodiments, the present disclosure can improve the three-dimensional sense of the texture by using the first optical layer and the second optical layer. Among them, the light-transmitting first optical layer and / or the second optical layer ensure that more light is transmitted onto the texture. The setting of the two optical layers further improves the visual effect of the texture, making the texture more three-dimensional, further increasing the depth sense of the texture, further refining the three-dimensional effect of the texture, improving the user experience, and increasing the product competitiveness.

[0057] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] The accompanying drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure.

[0059] Figure 1 is one of the schematic structural diagrams of a housing shown according to an exemplary embodiment;

[0060] Figure 2 is the second schematic structural diagram of a housing shown according to an exemplary embodiment;

[0061] Figure 3 is the schematic flowchart of an optical film preparation method shown according to an exemplary embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0062] Here, the exemplary embodiments will be described in detail, and the examples are shown in the accompanying drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. On the contrary, they are only examples of devices consistent with some aspects of the present disclosure as detailed in the appended claims.

[0063] In the description of the present disclosure, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings.

[0064] An embodiment of the present disclosure provides an optical film, including:

[0065] The first optical layer 20 has light transmissibility;

[0066] The second optical layer 40, which is stacked with the first optical layer 20, is used to reflect the light passing through the first optical layer 20 back toward the first optical layer 20, or transmit the light passing through the first optical layer 20.

[0067] In some embodiments, the first optical layer 20 and the second optical layer 40 can be directly adhered together, or there is another functional layer with light transmissibility between the first optical layer 20 and the second optical layer 30. The functional layer includes but is not limited to: the textured layer 30 with texture. The textured layer 30 may not be distributed between the first optical layer 20 and the second optical layer 40. For example: the first optical layer 20 is located between the textured layer 30 and the second optical layer 40, or the second optical layer 40 is located between the first optical layer 20 and the textured layer 30.

[0068] In some embodiments, the second optical layer 40 has light transmissibility, and the stacking order of the first optical layer 20 and the second optical layer 40 is not limited. For example: the light incident surface of the second optical layer 40 faces the first optical layer 20, that is, the first optical layer 20 is stacked above the second optical layer 40, and the light is incident from the first optical layer 20 onto the second optical layer 40; or, the light incident surface of the first optical layer 20 faces the second optical layer 40, that is, the second optical layer 40 is stacked above the first optical layer 20, and the light is incident from the second optical layer 40 onto the first optical layer 20. At this time, both the first optical layer 20 and the second optical layer 40 can be antireflection films. In addition to the antireflection film (Lens), the first optical layer 20 and / or the second optical layer 40 can also be: a gradient optical film or a color optical film, etc.; among them, the gradient optical film can be a gradient of color or a gradient of transparency. The colors of the color optical film include but are not limited to: red, blue, black, white, or green, etc.

[0069] In some embodiments, the second optical layer 40 does not have light transmissibility. For example, the second optical layer 40 is a high-reflection film. At this time, the light incident surface of the second optical layer 40 faces away from the first optical layer 20.

[0070] Without limitation, the textured layer 30 can be formed by means of etching, printing, or transfer, etc.

[0071] For example: such as Figure 1 and Figure 2As shown, raw materials such as ink can be used to form the texture layer 30 through methods such as UV (Ultraviolet) transfer printing, UV glue printing, ink printing, etc.

[0072] In some embodiments, the texture includes a texture that imitates the texture of natural objects, that is, a texture formed by borrowing and simulating the texture texture and the special properties of the organizational structure on the surface of natural objects. For example: The texture can be selected from at least one of the following: sandstone pattern, shell pattern, leather texture, snowflake pattern, or bark pattern, etc. In addition to the biomimetic texture, it can also be geometric patterns, logos, pictures, or relief patterns, etc., or a combination of biomimetic textures and patterns.

[0073] In the embodiments of the present disclosure, the use of the first optical layer and the second optical layer can improve the three-dimensional sense of the texture of the texture layer 30. Among them, the light-transmitting first optical layer and / or the second optical layer ensure that more light is incident on the texture of the texture layer. The setting of the two optical layers further improves the visual perception of the texture on the texture layer, making the texture layer 30 more three-dimensional and profound, and further refining the three-dimensional effect of the texture. Therefore, the present disclosure uses the first optical layer 20 and the second optical layer 40 to increase the three-dimensional visual experience of the optical film, which is beneficial to improving the user experience and increasing the product competitiveness.

[0074] For example: When the texture is a biomimetic texture, the first optical layer 20 and the second optical layer 40 can make the texture more realistic and closer to the natural object simulated by the texture.

[0075] The texture layer 30 can be single-layer or multi-layer. When applied to a terminal, considering the thin and light requirements of the terminal, the thinner the thickness of the texture layer 30, the better. The thickness of the texture layer 30 can be any value among 0.1μm, 0.5μm, 10μm, 23μm, 30μm, 50μm, 100μm, 200μm or any value between any two values. For example: The total thickness of the texture layer 30 is 0.1μm to 200μm. Another example: The total thickness of the texture layer 30 is 23μm to 33μm.

[0076] Without limitation, the first optical layer 20 can be a coating layer formed by plating. Similarly, the second optical layer 40 can also be a coating layer formed by plating.

[0077] Without limitation, the thicknesses of the first optical layer 20 and the second optical layer 40 can be independently selected from one of the following: 5nm, 10nm, 60nm, 100nm, 500nm, 1000nm or any value between any two values. For example: The thickness of the first optical layer 20 is 5nm to 1000nm, or 5nm to 10nm, and the thickness of the second optical layer 40 is 60nm to 1000nm.

[0078] In other alternative embodiments, the optical film further includes:

[0079] The texture layer 30 is located between the first optical layer 20 and the second optical layer 40.

[0080] The first optical layer 20 and the second optical layer 40 can respectively produce effects such as light transmission or reflection on both sides of the texture layer 30. Compared with the case where both the first optical layer 20 and the second optical layer 40 are provided on the same side of the texture layer 30, this way can further enhance the three-dimensional sense of the texture layer 30.

[0081] Without limitation, the first optical layer 20 can be directly formed on the light-incident surface of the texture layer 30, and the second optical layer 40 can be formed on the backlight surface of the texture layer 30, where the backlight surface of the texture layer 30 is the opposite surface of the light-incident surface of the texture layer 30. Or, the second optical layer 40 is not directly formed on the backlight surface of the texture layer 30. For example, there are other light-transmissive functional layers between the first optical layer 20 and the texture layer 30, and / or between the texture layer 30 and the second optical layer 40.

[0082] In other alternative embodiments, the optical film further includes;

[0083] A transparent substrate 10, and the transparent substrate 10 is located between the texture layer 30 and the first optical layer 20.

[0084] In some embodiments, the optical film includes a stacked transparent substrate 10, a first optical layer 20, a texture layer 30, and a second optical layer 40; wherein, the transparent substrate 10 is located between the first optical layer 20 and the texture layer 30; the texture layer 30 is located between the transparent substrate 10 and the second optical layer 40.

[0085] Such as Figure 1 and Figure 2 As shown, the first optical layer 20 and the texture layer 30 can be respectively attached to two surfaces opposite to the transparent substrate 10. At this time, the transparent substrate is at least used to support the texture layer and the first optical layer.

[0086] In some embodiments, the transparent substrate 10 is a flexible substrate. Compared with a rigid substrate, the flexible substrate can have a smaller volume and density, can obtain a thinner size, and the flexible substrate can be freely bent or folded, which can improve the degree of fit with the housing of the terminal and is also more convenient to realize the fitting and fixing of the optical film with the terminal housing.

[0087] In other alternative embodiments, the material of the transparent substrate 10 includes at least one of the following: polyethylene glycol terephthalate (PET), polyimide (PI), polycarbonate (PC), or flexible glass. Such materials have good flexibility, which is conducive to making the optical film thinner and lighter, and facilitating the storage, transportation, and use of the optical film.

[0088] It can be understood that other transparent materials can also be selected for the material of the transparent substrate 10. For example, acrylic resins including polymethyl methacrylate (PMMA), polyurethane (PU), polyvinyl chloride (PVC), acrylonitrile-butadiene-styrene copolymer (ABS), polyolefins such as polyethylene (PE) or polypropylene (PP), etc.

[0089] In the embodiments of the present disclosure, "light transmissive" or "transparent" can be expressed as a visible light transmittance of about 60% or higher. For example, the light transmittance is 90%, 95%, or more than 99%. It can be understood that the better the light transmittance of the transparent substrate 10, the more conducive it is for light to pass through the transparent substrate 10, and the more conducive it is to ensuring the optical properties of the texture layer 30 and the second optical layer 40 located on the transparent substrate 10, and improving the three-dimensional sense of the texture of the texture layer 30.

[0090] In other alternative embodiments, the light transmittance of the first optical layer 20 is greater than that of the second optical layer 40; and / or,

[0091] The reflectivity of the second optical layer 40 is greater than that of the first optical layer 20.

[0092] Relatively speaking, as Figure 1 and Figure 2 shown, a larger light transmittance of the first optical layer 20 is more conducive to allowing more light to pass through the first optical layer 20 and reach the transparent substrate 10 and other layers, ensuring the optical properties of the layers below the first optical layer 20, and making the texture of the texture layer 30 clearer and more three-dimensional.

[0093] The reflectivity of the second optical layer 40 being greater than that of the first optical layer 20 is conducive to the reflection of incident light by the second optical layer 40. The light reflected by the second optical layer 40 can be observed by the user through the texture layer 30 and the transparent substrate 10, thereby further improving the visual appearance of the texture and making the texture more delicate and three-dimensional.

[0094] In some embodiments, the first optical layer 20 is an antireflection film, and the second optical layer 40 is a high-reflection film. For example, the first optical layer 20 is a transparent layer, the second optical layer 40 is a non-transparent layer, and the reflectivity of the second optical layer 40 to visible light is much greater than that of the first optical layer 20. The light incident on the second optical layer 40 through the first optical layer 20 can be almost completely reflected. The optical film with such a structure can further make the boundary of the texture more obvious, further improve the "floating feeling" of the texture, and the texture will be more delicate and three-dimensional.

[0095] In other alternative embodiments, the first optical layer 20 and / or the second optical layer 40 includes:

[0096] A first sub-layer and a second sub-layer distributed in a stacked manner, with different refractive indexes of the first sub-layer and the second sub-layer;

[0097] And / or,

[0098] The second optical layer 40 includes; a third sub-layer and a fourth sub-layer distributed in a stacked manner, with different refractive indexes of the third sub-layer and the fourth sub-layer.

[0099] The two optical layers, the first optical layer 20 and the second optical layer 40, respectively include sub-layers with different refractive indexes. In practical applications, the sub-layers with different refractive indexes can be selected and stacked according to needs, and optical layers with different optical effects can be obtained.

[0100] In other alternative embodiments, the first optical layer 20 includes: a plurality of the first sub-layers and a plurality of the second sub-layers, with the first sub-layers and the second sub-layers alternately distributed; and / or;

[0101] The second optical layer 40 includes: a plurality of the third sub-layers and a plurality of the fourth sub-layers, with the third sub-layers and the fourth sub-layers alternately distributed.

[0102] In the embodiments of the present disclosure, both the first optical layer 20 and the second optical layer 40 can be single-layer structures or multi-layer structures. For example: the number of layers of the optical layer can be 1 to 100 layers. In the multi-layer structure, the optical layer is formed by alternately arranging two sub-layers with different refractive indexes. Generally, the more layers there are, the better the antireflection effect or the high-reflection effect of the optical layer, and the more delicate the effect of the texture layer 30 on the texture. However, considering the process feasibility and cost of industrial production, the total number of layers of the optical layer can be 1 to 9 layers, or 1 to 5 layers.

[0103] Without limitation, in the first optical layer 20, the refractive index of the first sub-layer is less than that of the second sub-layer. For example, the first sub-layer and the second sub-layer are alternately stacked in sequence, and the first sub-layer with a smaller refractive index is closer to the texture layer 30. An optical layer with such a structure can achieve a better anti-reflection effect. In the second optical layer 40, the refractive index of the third sub-layer is greater than that of the fourth sub-layer. For example, the third sub-layer and the fourth sub-layer are alternately stacked in sequence, and the third sub-layer with a larger refractive index is closer to the texture layer. An optical layer with such a structure can achieve a better reflection enhancement effect.

[0104] Without limitation, the material of the second sub-layer or the third sub-layer with a higher refractive index includes at least one of the following: ZnS, or a mixture of ZnS and a metal oxide, and the metal oxide includes at least one of the following: Al2O3, ZrO2, Ti2O5, TiO2, Nb2O3, or SiNx (where x can be 3 / 4), etc. The material of the first sub-layer or the fourth sub-layer with a lower refractive index includes at least one of the following: a metal fluoride or a mixture of SiO2, and the metal fluoride includes but is not limited to: MgF2. The content of the metal fluoride is 0 at% to 100 at%, for example: the content of the metal fluoride is 0 at%, 10 at%, 20 at%, 50 at%, or 100 at%.

[0105] In some embodiments, the material of the second optical layer 40 includes: a mixture of SiO2 and a metal oxide. For example, the material of the second optical layer 40 includes: a mixture of Al2O3, where the weight percentage content of Al2O3 is between 0% and 10%. For example, the weight percentage content of Al2O3 is 1%, 5%, 9%, or 10%, etc.

[0106] In other alternative embodiments, the optical film further includes:

[0107] A shielding layer 50, the light incident surface of the shielding layer faces the second optical layer 40, and the second optical layer 40 is located between the texture layer 30 and the shielding layer

[0108] Without limitation, as Figure 1 shown, the shielding layer 50 is attached to the second optical layer 40.

[0109] When applied to a terminal, the shielding layer 50 has a light blocking effect, isolating the optical film and the internal structure inside the terminal, so as to ensure that the internal structures such as the functional modules inside the terminal will not be observed by the user through the optical film, affecting the visual appearance of the texture.

[0110] It can be understood that the optical film may not include the shielding layer 50 either.

[0111] In some embodiments, as Figure 2As shown, the second optical layer 40 is an opaque layer. Since the light incident on the second optical layer 40 is basically not transmitted and is mostly reflected, the second optical layer 40 itself has a shielding effect, and the internal structure of the terminal will not be observed through the first optical layer 20. At this time, the optical film may not include the shielding layer 40.

[0112] In some embodiments, as Figure 1 shown, the second optical layer 40 is a transparent layer. For example, both the second optical layer 40 and the first optical layer 20 are antireflection films with the same structure. At this time, since the second optical layer 40 does not have a shielding effect, the shielding layer 50 is necessary.

[0113] Without limitation, the shielding layer 50 includes: an ink layer. An ink layer of black, white or other colors can be formed on the second optical layer 40 by means such as screen printing.

[0114] Embodiments of the present disclosure also provide a housing, including:

[0115] A transparent housing 70 having an outer surface and an inner surface opposite to the outer surface; wherein, the outer surface is the light incident surface of the transparent housing 70;

[0116] The optical film according to any of the above embodiments, wherein the first optical layer 20 faces the inner surface of the transparent housing 70.

[0117] The optical film is located inside the transparent housing 70, and the transparent housing 70 has a protective effect on the optical film, which is beneficial to extending the service life of the optical film.

[0118] Without limitation, the transparent housing 70 can be a glass housing or a plastic housing made of transparent resin.

[0119] In some embodiments, as Figure 1 and Figure 2 shown, the first optical layer 20 is attached to the inner surface of the transparent housing 70. For example: the first optical layer 20 can be attached to the inner surface of the transparent housing 70 through an adhesive 60. Without limitation, the adhesive 60 is an optical adhesive (OCA, Optically Clear Adhesive), and this adhesive 60 has a high light transmittance and can effectively ensure the optical effect of the optical film.

[0120] The adhesive 60 includes but is not limited to: silicone, acrylic resin or epoxy resin glue, etc.

[0121] In addition, other functional layers with light transmittance can be provided between the first optical layer 20 and the transparent housing 70.

[0122] Embodiments of the present disclosure also provide a terminal, including: the housing according to any of the above embodiments.

[0123] In practical applications, the terminal further includes a functional module installed in the housing.

[0124] The terminal includes, but is not limited to, a mobile phone, a notebook, a tablet computer, a television, or a wearable device, etc.

[0125] The functional module can be a module formed by combining one or more devices capable of performing preset functions. Exemplarily, the functional module includes, but is not limited to: a battery, a speaker, a camera, or a display module, etc.

[0126] Without limitation, the housing can be the front housing, the rear housing, or the frame of the terminal, etc. Exemplarily, the housing can also be the battery housing of the terminal, etc.

[0127] As Figure 3 shown, the embodiments of the present disclosure further provide a method for preparing an optical film, including:

[0128] Step S101, forming a first optical layer 20; transparent substrate 10 first optical layer 20 first optical layer 20

[0129] Step S102, forming a second optical layer 40 stacked with the first optical layer 20; wherein, the second optical layer 40 is used to reflect the light passing through the first optical layer 20 towards the first optical layer 20, or transmit the light passing through the first optical layer 20.

[0130] Without limitation, the optical film in this embodiment has the same structure as the optical film in any of the above embodiments.

[0131] In step S101, methods such as vacuum coating can be used to deposit an optical coating on a transparent substrate to form the first optical layer 20. Among them, the optical coating includes metal fluoride and SiO2. The transparent substrate includes: PET film, PI film, PC film, PU film, or flexible glass, etc. Alternatively, the first optical layer is a coating layer formed after curing of the optical coating.

[0132] In step S102, without limitation, the structure of the second optical layer 40 can be the same as that of the first optical layer 20. The second optical layer 40 can also be prepared by the same method as the first optical layer 20. For example: depositing to form the first optical layer 20 and / or the second optical layer 40.

[0133] The second optical layer 40 can be directly adhered to the first optical layer 20, or there is also other light-transmissive functional layer between the first optical layer 20 and the second optical layer 40.

[0134] In practical applications, the preparation sequence of step S101 and step S102 is not limited. It is also possible to first form the second optical layer 40 and then form the first optical layer 20.

[0135] In other optional embodiments, the method further includes:

[0136] Forming a texture layer 30; wherein, the texture layer 30 is located between the first optical layer 20 and the first optical layer 20.

[0137] Without limitation, the texture of the texture layer 30 can be formed by printing, transfer printing, etching or the like.

[0138] In other optional embodiments, the method further includes:

[0139] Forming the first optical layer 20 on the first surface of the transparent substrate 10;

[0140] Forming the texture layer 30 on the second surface of the transparent substrate 10; wherein, the second surface is the opposite surface of the first surface.

[0141] The first surface is the light incident surface of the transparent substrate 10.

[0142] Without limitation, the first optical layer 20 can be formed on the first surface of the transparent substrate 10 by coating or plating, or the texture layer 30 can be formed on the surface of the transparent substrate 1010 by methods such as UV (Ultraviolet) transfer printing, UV glue printing, ink printing, etc.

[0143] In other optional embodiments, the method further includes:

[0144] Forming a shielding layer 50; wherein, the light incident surface of the shielding layer 50 faces the second optical layer 40, and the second optical layer 40 is located between the first optical layer 20 and the shielding layer.

[0145] The shielding layer 50 can be formed by printing, transfer printing, printing, coating or plating, etc.

[0146] In some embodiments, the shielding layer is formed by screen printing.

[0147] In other optional embodiments, the forming of the first optical layer 20 includes:

[0148] Forming a first sub-layer;

[0149] Forming a second sub-layer stacked with the first sub-layer; wherein, the refractive indexes of the first sub-layer and the second sub-layer are different;

[0150] And / or, the forming of the second optical layer 40 includes:

[0151] Forming a third sub-layer;

[0152] Form a fourth sub-layer stacked with the third sub-layer; wherein, the refractive indexes of the third sub-layer and the fourth sub-layer are different.

[0153] In practical applications, through a plating method, the first sub-layer can be plated first, and then the second sub-layer can be plated on the first sub-layer to form the first optical layer 20. The second optical layer 40 can also be formed by plating the third sub-layer and the fourth sub-layer respectively in the same way.

[0154] In other alternative embodiments, the first optical layer 20 includes: a plurality of the first sub-layers and a plurality of the second sub-layers, and the first sub-layers and the second sub-layers are alternately distributed; and / or;

[0155] The second optical layer 40 includes: a plurality of the third sub-layers and a plurality of the fourth sub-layers, and the third sub-layers and the fourth sub-layers are alternately distributed.

[0156] In other alternative embodiments, the light transmittance of the first optical layer 20 is greater than that of the second optical layer 40; and / or, the reflectivity of the second optical layer 40 is greater than that of the first optical layer 20.

[0157] Relatively speaking, as Figure 1 and Figure 2 shown, a larger light transmittance of the first optical layer 20 is more conducive to allowing more light to pass through the first optical layer 20 and reach the transparent substrate 10 and other layers, ensuring the optical performance of the layers below the first optical layer 20, and making the texture of the texture layer 30 clearer and more three-dimensional.

[0158] The reflectivity of the second optical layer 40 being greater than that of the first optical layer 20 is conducive to the reflection of incident light by the second optical layer 40. The light reflected by the second optical layer 40 can be observed by the user through the texture layer 30 and the transparent substrate 10, thereby further improving the visual effect of the texture and making the texture more delicate and three-dimensional.

[0159] In a specific example, the optical film is applied to a mobile phone. The mobile phone includes a battery case, a battery, and a frame body. The frame body has a receiving compartment for accommodating the battery, and the battery case covers the receiving compartment. The battery case includes a glass outer shell and an optical film. The optical film is located between the inner surface of the glass outer shell and the battery, and the first optical layer 20 is attached to the inner surface of the transparent outer shell 70. The manufacturing process of the battery case is generally as follows: First, clean the flexible materials such as PET, PI, PC, and ultra-thin glass used as the substrate of the three-dimensional bionic film (i.e., the optical film). Use methods such as UV transfer printing, UV glue printing, and ink printing to engrave the three-dimensional bionic texture on one or several surfaces of the above flexible substrates to form a texture layer. Considering the requirements of the ultra-thinness of the mobile phone and the extreme sense of three-dimensional bionic texture (i.e., the texture on the texture layer 30), the thickness of the texture layer 30 is 23-30 μm; the texture can be one or more of sandstone pattern, shell pattern, snowflake pattern, bark pattern, etc. Then, use the vacuum coating method to deposit the second optical layer 40 on the texture layer 30. Among them, the second optical layer 40 is a 5-layer film formed by alternately laminating a low-refractive-index film and a high-refractive-index film. The coating parameters are generally as follows: the background vacuum is 1×10 -5 ~5×10 -5 Pa, the substrate temperature is 20-200 °C, the coating time is 1-60 min, the working atmosphere is an atmosphere containing oxygen, argon, and hydrogen (or water vapor), the working pressure is 0.5-5 Pa, and the sputtering power density is 1-300 W / cm 2 . The ratio of hydrogen (or water vapor) to oxygen is between 10% and 30% vol. After the deposition of the first optical layer 20 is completed, heat in the vacuum chamber to remove the water vapor or hydrogen in the first optical film. The vacuum degree is set at 1×10 -5 ~5×10 -5 Pa, the heating temperature is set at 80-150 °C, and the time is 10-30 min. Subsequently, screen-print an ink layer on the second optical layer 40. For the sense of three-dimensional bionics of the optical film, further, on the other side of the flexible substrate, deposit the first optical layer 20 by the vacuum coating method. The material of the first optical layer 20 includes a mixture of SiO2 and Al2O3, where the mass percentage content of Al2O3 is between 0% and 10%. Then, coat an adhesive (i.e., the adhesive 60) on the surface of the second optical layer 40. As shown in Figure 1 , use the adhesive to bind the optical film to the inner surface of the glass outer shell.

[0160] The features disclosed in several product embodiments provided by the present disclosure can be combined arbitrarily without conflict to obtain new product embodiments.

[0161] The features disclosed in several method embodiments provided by the present disclosure can be combined arbitrarily without conflict to obtain new product embodiments.

[0162] The features disclosed in several product embodiments and method embodiments provided by the present disclosure can be arbitrarily combined without conflict to obtain new product embodiments or method embodiments.

[0163] Those skilled in the art will readily conceive of other implementations of the present disclosure after considering the specification and practicing the invention disclosed herein. The present disclosure is intended to cover any variations, uses, or adaptations of the present disclosure, which follow the general principles of the present disclosure and include known common general knowledge or conventional technical means in the technical field not disclosed by the present disclosure. The specification and embodiments are only considered exemplary, and the true scope and spirit of the present disclosure are pointed out by the claims.

[0164] It should be understood that the present disclosure is not limited to the exact structures already described and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is only limited by the appended claims.

Claims

1. An optical film, characterized in that, Comprising: The first optical layer has light transmissivity and includes an antireflection film; The second optical layer is stacked with the first optical layer, and the second optical layer does not have light transmissivity and is used to reflect the light passing through the first optical layer towards the first optical layer; The texture layer is located between the first optical layer and the second optical layer; wherein, the first optical layer includes a first sub-layer and a second sub-layer which are stacked; the refractive index of the first sub-layer is less than that of the second sub-layer, and the first sub-layer is closer to the texture layer; The transparent substrate is located between the texture layer and the first optical layer; Wherein, the optical film is used to be arranged on the inner side of the transparent housing to form a housing.

2. The optical film according to claim 1, wherein The optical film further includes: The shielding layer, the light incident surface of the shielding layer faces the second optical layer, and the second optical layer is located between the texture layer and the shielding layer.

3. The optical film according to claim 1, wherein The second optical layer includes; a third sub-layer and a fourth sub-layer which are stacked, and the refractive indices of the third sub-layer and the fourth sub-layer are different.

4. The optical film according to claim 3, wherein The second optical layer includes: a plurality of the third sub-layers and a plurality of the fourth sub-layers, and the third sub-layers and the fourth sub-layers are alternately distributed.

5. The optical film according to claim 2, wherein The shielding layer includes: an ink layer.

6. The optical film according to claim 1, wherein The material of the transparent substrate includes at least one of the following: polyethylene terephthalate, polyimide, polycarbonate or flexible glass.

7. A housing, characterized in that, Comprising: The transparent housing has an outer surface and an inner surface opposite to the outer surface; wherein, the outer surface is the light incident surface of the transparent housing; The optical film according to any one of claims 1 to 6, and the first optical layer faces the inner surface of the transparent housing.

8. A terminal, characterized in that Comprising: The housing according to claim 7.

9. A method for preparing an optical film, characterized in that, Comprising: Forming a first optical layer on the first surface of the transparent substrate, and the first optical layer is an antireflection film; Forming a texture layer on the second surface of the transparent substrate; wherein, the second surface is the opposite surface of the first surface; wherein, the first optical layer includes a first sub-layer and a second sub-layer which are stacked; the refractive index of the first sub-layer is less than that of the second sub-layer, and the first sub-layer is closer to the texture layer; Forming a second optical layer which is stacked with the first optical layer and is located on the side of the texture layer away from the transparent substrate, wherein, the second optical layer does not have light transmissivity and is used to reflect the light passing through the texture layer towards the first optical layer; Wherein, the optical film is used to be arranged on the inner side of the transparent housing to form a housing.

10. The method for preparing an optical film according to claim 9, wherein, The forming the texture layer on the second surface of the transparent substrate includes: Printing or transferring to form the texture layer on the second surface of the transparent substrate.

11. The method for preparing the optical film according to claim 9, wherein The method further includes: Forming a shielding layer; wherein, the light incident surface of the shielding layer faces the second optical layer, and the second optical layer is located between the first optical layer and the shielding layer.

12. The method for preparing an optical film according to claim 11, wherein The forming the shielding layer includes: Printing to form the shielding layer.

13. The method for preparing the optical film according to claim 9, wherein, The method further includes: Plating to form the first optical layer and / or the second optical layer.

14. The manufacturing method of the optical film according to claim 9, characterized in that, The forming the second optical layer includes: Forming a third sub-layer; Form a fourth sub-layer stacked with the third sub-layer; wherein, the refractive indices of the third sub-layer and the fourth sub-layer are different.

15. The method for preparing an optical film according to claim 14, wherein The second optical layer includes: a plurality of the third sub-layers and a plurality of the fourth sub-layers, and the third sub-layers and the fourth sub-layers are alternately distributed.

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