Appearance structural member for terminal device and terminal device

Abstract

The present application provides an appearance structural member for a terminal device and a terminal device. The appearance structural member comprises a substrate and a film layer, wherein the film layer covers an outer surface of the substrate and is configured as a color display structure. The film layer comprises at least one dielectric stack layer. Each dielectric stack layer comprises a first dielectric layer and a second dielectric layer which are stacked in the thickness direction of the dielectric stack layer and are made of different materials, and the refractive index of the second dielectric layer is different from that of the first dielectric layer. In the present application, by adjusting the refractive indexes and thicknesses of the first dielectric layer and the second dielectric layer in the dielectric stack layer, the film layer can be less prone or even not prone to color mixing, and a target color (for example, Chinese red) can be better presented, thereby satisfying consumer demands.

Description

Appearance structure for terminal device and terminal device

[0001] The present application claims priority to the Chinese patent application No. 202410903060.8, filed on July 5, 2024, and entitled "Appearance structure for terminal device and terminal device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of terminal materials, and in particular to an appearance structure for a terminal device and the terminal device. BACKGROUND

[0003] The appearance structure (e.g., a mobile phone back cover, a watchband, etc.) of a terminal device usually includes a base body and a colored film layer covering the outer surface of the base body. However, the medium layer material in the colored film layer for adjusting the color displayed by the appearance structure is single, which causes the colored film layer to have a wide reflection light wave band and easily causes color mixing, and it is difficult to present a bright target color (e.g., bright Chinese red).

[0004] As can be seen, in the prior art, the appearance structure of the terminal device is prone to color mixing, and it is difficult to present a target color (e.g., bright Chinese red), which cannot meet the needs of consumers. SUMMARY

[0005] The embodiments of the present application provide an appearance structure for a terminal device and the terminal device, which solve the problem that the appearance structure of the terminal device in the prior art is prone to color mixing, and it is difficult to present a target color (e.g., bright Chinese red), which cannot meet the needs of consumers.

[0006] A first aspect of the embodiments of the present application provides an appearance structure for a terminal device, including a base body and a film layer. The base body has an outer surface, and the film layer is arranged on the outer surface of the base body and is configured as a color developing structure.

[0007] The film layer includes at least one medium stack layer, each layer of the at least one medium stack layer includes a first medium layer and a second medium layer which are arranged in a stack along the thickness direction and have different materials, and the refractive index of the second medium layer is different from that of the first medium layer.

[0008] The appearance structure provided in the present application comprises a base body and a film layer arranged on the outer surface of the base body, wherein each medium stack layer of the film layer comprises first and second medium layers arranged in a stack and having different refractive indexes. By adjusting the refractive indexes and thicknesses of the first and second medium layers, visible light incident on the film layer can be reflected, the wavelength band of the reflected light comprises a target wavelength band, and the reflectivity of the light in the target wavelength band is relatively high, so that the target color can be better realized. The reflectivity can be understood as the ratio of the intensity of the reflected light to the intensity of the incident light after the light is incident on the film layer from the outside.

[0009] Further, the difference between the refractive indexes of the respective stack layers of the film layer determines the reflection bandwidth. The reflection bandwidth can be understood as the wavelength band width of the light with high reflectivity in the reflection spectrum of the film layer. By adjusting the difference between the refractive indexes of the first and second medium layers, the reflection bandwidth can be matched with the wavelength range corresponding to the target color, so that the film layer is less likely to have color mixing or even does not have color mixing, and the film layer can better present the target color with high purity.

[0010] Therefore, the appearance structure provided in the present application can make the film layer less likely to have color mixing or even does not have color mixing, and can better present the target color (for example, Chinese red color), so as to meet the needs of consumers.

[0011] In a possible implementation, the material of the first medium layer is SiyONx, x and y are positive numbers, and the material of the second medium layer is amorphous silicon. The refractive index of SiyONx is relatively low, the refractive index of amorphous silicon is high, and the wear resistance of both is good, which is beneficial to improving the wear resistance and corrosion resistance of the film layer while ensuring the color.

[0012] The appearance structure provided in the present application is characterized in that the material of the first medium layer is SiyONx, y and x are positive numbers. The refractive index of SiyONx can be adjusted by adjusting the ratio between x and y, and the film layer can present different colors by matching with the second medium layer with high refractive index. Amorphous silicon has a certain extinction coefficient, and the brightness of the color of the film layer can be adjusted by adjusting the thickness of the second medium layer. Therefore, the appearance structure provided in the present application can present different colors by adjusting the element ratio of the first medium layer, and can meet the differentiated needs of consumers.

[0013] In a possible implementation, the material of the base body is an alloy material or plastic, and the first medium layer is a layer corresponding to the medium stack layer and close to the base body in the thickness direction. When the material of the base body is titanium alloy or aluminum alloy, the value of y in the material SiyONx of the first medium layer is 1, and the value of x is 1.

[0014] By the above scheme, the outer surface of the base is covered with the first medium layer, and the base is made of an alloy material or plastic, and the ratio of y and x in SiyONx is adjusted to make the base have good bonding force with the film layer, so that the film layer is not easy to fall off, the appearance structure is not easy to discolor, and the reliability is high.

[0015] In a possible implementation, the difference between the refractive index of the second medium layer and the refractive index of the first medium layer is greater than or equal to 2, and the at least one medium stack layer is configured to: after visible light is incident on the film layer, the reflected light has a wavelength band of 630 nm to 700 nm, and the reflectivity of light with a wavelength of 630 nm to 700 nm is greater than or equal to 60%. The wavelength band of 630 nm to 700 nm is in the red light band. The film layer has strong ability to reflect red light, so that the film layer appears red to the consumer. In addition, the difference between the refractive index of the first medium layer and the refractive index of the second medium layer is greater than or equal to 2, so that the reflection bandwidth matches the wavelength range corresponding to the Chinese red color in the red light, thereby preventing the film layer from being discolored and ensuring that the film layer can present Chinese red with high color purity.

[0016] In a possible implementation, after visible light is incident on the film layer, light with a wavelength of 420 nm to 580 nm is absorbed by the film layer. In this way, light with a wavelength of 420 nm to 580 nm, which is not in the red light band, is absorbed, so that the light in the red light band is not affected by the light with a wavelength of 420 nm to 580 nm, and the appearance structure can better present red.

[0017] In a possible implementation, the reflectivity of light with a wavelength of 630 nm to 700 nm is greater than or equal to 80%. The reflectivity is high, so that the appearance structure presents Chinese red with better color effect.

[0018] In a possible implementation, the refractive index of the first medium layer is 1.4 to 1.9, and the refractive index of the second medium layer is 4 to 5. The first medium layer is a low-refractive-index medium layer, the second medium layer is a high-refractive-index medium layer, and the difference between the refractive indices of the two medium layers is greater than 2.

[0019] In a possible implementation, the extinction coefficient of the first medium layer is 0 to 0.002, and the thickness is 120 nm to 250 nm. The extinction coefficient of the second medium layer is 0.1 to 0.8, and the thickness is less than or equal to 100 nm.

[0020] It can be understood that a bundle of light waves is incident on the film layer, and is reflected on two surfaces of the film layer arranged in opposite directions along the thickness direction of the film layer, and the two columns of reflected light interfere with each other. Due to the wave nature of light, the two columns of reflected light can interfere constructively (the wave crests or troughs of the two waves meet, and the interference light intensity increases) or destructively (the amplitudes of the two waves cancel each other out, and the interference light intensity decreases), depending on the phase relationship between them, and the phase relationship depends on the optical path difference between the two columns of reflected light and the wavelength of the light, and the optical path difference depends on the thickness of the film layer and the refractive index of the light. The color presented by the film layer is the color of the light whose wavelength interferes constructively. Therefore, by controlling the refractive index and thickness of each of the first medium layer and the second medium layer, and the refractive index difference between the two, the thickness and refractive index of the film layer can be adjusted so that the reflectivity of the light wave of Chinese red color is relatively high, and the reflectivity of the light of other colors is relatively low.

[0021] Further, the thickness of the second medium layer with a relatively high extinction coefficient is smaller, which is beneficial to make the color presented by the film layer brighter, and meet the consumer's preference for bright Chinese red color.

[0022] In a possible implementation, the at least one medium stack layer is a plurality of medium stack layers arranged in a stack along the thickness direction of the film layer. The use of the plurality of medium stack layers arranged in a stack is beneficial to improve the stability of the presented color, and ensure the color uniformity of each batch of appearance structure.

[0023] In a possible implementation, the plurality of medium stack layers is a 3-layer medium stack layer. The 3-layer medium stack layer ensures the stability of the color and the brightness of the color.

[0024] In a possible implementation, the film layer further includes a wear-resistant layer, and the at least one medium stack layer is arranged between the wear-resistant layer and the substrate along the thickness direction of the film layer. The hardness of the wear-resistant layer is greater than the hardness of the first medium layer and the second medium layer. The wear-resistant layer is arranged on the side of the medium stack layer away from the substrate along the thickness direction of the film layer, which is beneficial to protect the medium stack layer and improve the wear resistance and corrosion resistance of the film layer.

[0025] In a possible implementation, the material of the wear-resistant layer is ta-C, and the thickness of the wear-resistant layer is less than or equal to 15 nm. The hardness of ta-C is high, so that the wear resistance of the film layer is good. The thickness of the wear-resistant layer is small, and does not affect the brightness of the color presented by the film layer.

[0026] In a possible implementation, the film layer further includes a transition layer, and the transition layer is arranged between the at least one medium stack layer and the wear-resistant layer along the thickness direction of the film layer, and the refractive index of the transition layer is less than the refractive index of the wear-resistant layer. The material of the wear-resistant layer is a high-refractive-index material, and the combination of the transition layer with a smaller refractive index arranged in a stack can also be regarded as a medium stack layer, and does not affect the color presented by the film layer.

[0027] In a possible implementation, the material of the transition layer is SiyONx, x and y are positive numbers, the thickness of the transition layer is 120 nm-250 nm, and the refractive index is 1.4-1.9. The refractive index of the wear-resistant layer is 2-3. The material of the transition layer is the same as that of the first dielectric layer, which reduces the complexity of processing and reduces the cost.

[0028] In a possible implementation, the film layer further includes a waterproof layer, the waterproof layer is stacked with at least one dielectric stack layer in the thickness direction of the film layer, and the waterproof layer is the layer farthest from the base in the film layer. The waterproof layer enables the film layer to be anti-fouling and waterproof, and improves the performance of the film layer and the use experience of consumers.

[0029] In a possible implementation, the material of the waterproof layer is Si-O-F or Si-F.

[0030] In a possible implementation, the thickness of the waterproof layer is 1 nm-2 nm. The thickness of the waterproof layer is very thin, and the color is transparent, which does not affect the color of the film layer and ensures the lightness and thinness of the film layer.

[0031] In a possible implementation, the appearance structure is a shell or a watchband.

[0032] The second aspect of the embodiments of the present application further provides a terminal device including the appearance structure provided by the first aspect of the embodiments of the present application and any possible implementation, and the surface of the film layer away from the base constitutes at least part of the outer surface of the terminal device.

[0033] The terminal device provided by the present application can have a target color (for example, bright Chinese red, or other colors preferred by consumers), which meets the diverse needs of consumers. BRIEF DESCRIPTION OF DRAWINGS

[0034] FIG. 1 is a schematic diagram of the film layer structure of the appearance structure in a scheme;

[0035] FIG. 2a is a schematic diagram of the structure of the terminal device of the embodiments of the present application from the back perspective;

[0036] FIG. 2b is a schematic diagram of the exploded structure of the terminal device of the embodiments of the present application;

[0037] FIG. 2c is a sectional view of the terminal device of the embodiments of the present application along A-A;

[0038] FIG. 3a is a schematic diagram of the structure of the base and the dielectric stack layer of the appearance structure of the embodiments of the present application;

[0039] FIG. 3b is a reflectance spectrum diagram of the appearance structure of the embodiments of the present application;

[0040] FIG. 4 is a schematic diagram of the appearance structure of the embodiments of the present application;

[0041] Fig. 5a is a structural schematic diagram of an appearance structure of an embodiment of the present application, in which the medium stack layer is three layers;

[0042] Fig. 5b is a structural schematic diagram of an appearance structure of an embodiment of the present application, in which the film layer includes an abrasion-resistant layer;

[0043] Fig. 5c is a structural schematic diagram of an appearance structure of an embodiment of the present application, in which the film layer includes a transition layer;

[0044] Fig. 5d is a structural schematic diagram of an appearance structure of an embodiment of the present application, in which the film layer includes a waterproof layer.

[0045] Legend: One scheme: 100', appearance structure; 10', base body; 11', outer surface; 20', film layer; 21', TiAlN layer; 22', TiAlON layer; 23', Al2O3 layer; Z', thickness direction of the film layer.

[0046] The present application: 100, terminal device; 10, screen; 20, shell; 21, middle frame; 211, bottom plate; 2111, first surface; 2112, second surface; 212, frame; 22, back cover; 30, accommodating space; 31, first mounting cavity; 32, second mounting cavity; 400, appearance structure; 50, base body; 501, outer surface; 60, film layer; 61, medium stack layer; 611, first medium layer; 612, second medium layer; 62, abrasion-resistant layer; 63, transition layer; 64, waterproof layer; X, thickness direction of the terminal device; Z, thickness direction of the film layer; O1, incident light; O2, reflected light; O3, reflected light. DETAILED DESCRIPTION

[0047] The present application will be described in greater detail by way of specific embodiments, from which its advantages and effects will be readily apparent to those of ordinary skill in the art. Although the present application will be described with reference to some embodiments, this does not mean that the features of the present application are limited to the embodiments. On the contrary, the purpose of describing the present application with reference to the embodiments is to cover other options or modifications that can be extended based on the claims of the present application. In order to provide a deep understanding of the present application, many specific details will be included in the following description. The present application can also be implemented without using these details. In addition, in order to avoid confusion or obscure the focus of the present application, some specific details will be omitted in the description. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0048] It should be noted that in the present specification, similar reference numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.

[0049] Hereinafter, terms that can occur in the embodiments of the present application are explained.

[0050] Extinction coefficient: the ability of a material to cause a loss of energy in transmitted and reflected light waves. The greater the extinction coefficient, the stronger the material's ability to absorb and scatter light.

[0051] Thin film interference: assuming a light wave is shot at a thin film, due to the difference in refractive index between the thin film and the external environment, the light wave will be reflected at the upper and lower interfaces of the thin film, respectively, and the reflected light will interfere with each other to form a new light wave, which is called thin film interference.

[0052] Natural light: composed of light rays of various wavelengths, covering a wide spectrum range from ultraviolet to visible light to infrared.

[0053] Phase difference: the difference between the phases of two physical quantities that vary periodically.

[0054] Lab value: L represents luminosity, which is equivalent to brightness, a represents the range from red to green, and b represents the range from blue to yellow. All colors are composed of the three values.

[0055] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "top", "bottom", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0056] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0057] In the description of this application, it should be understood that "electrical connection" can be understood as physical contact and electrical conduction between components; it can also be understood as the form in which different components in a circuit structure are connected through physical lines that can transmit electrical signals, such as copper foil or wires on a printed circuit board (PCB).

[0058] In the description of this application, it should be noted that the mutual perpendicularity in this application is not absolute perpendicularity. Approximate perpendicularity due to processing errors and assembly errors (e.g., the included angle between two structural features is 89.9°) is also within the scope of mutual perpendicularity in this application. Similarly, the mutual parallelism in this application is not absolute parallelism. Approximate parallelism due to processing errors and assembly errors (e.g., the included angle between two structural features is 0.1°) is also within the scope of mutual parallelism in this application. This application does not impose specific limitations in this regard.

[0059] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0060] The external structural components of terminal devices (such as mobile phone back covers and watch straps) typically consist of a substrate and a colored film layer covering the outer surface of the substrate. However, the dielectric material in this colored film layer, which adjusts the color of the external structural component, is of a single type, resulting in a wide range of reflected light wavelengths and a tendency for color mixing, making it difficult to display a bright target color (e.g., a bright Chinese red). Therefore, in the prior art, the external structural components of terminal devices are prone to color mixing and struggle to display the target color (e.g., a bright Chinese red), failing to meet consumer needs.

[0061] In some solutions, the dielectric layer in the colored film layer that adjusts the display color of the structural components is set as a multilayer composite layer. Adjusting the ratio of each layer in the colored film layer can make the structural components present a rich variety of colors, satisfying consumers' preferences for various colors. Surveys have found that Chinese consumers particularly like bright Chinese red, but currently, it is rare to find a vibrant Chinese red in the structural components of electronic products.

[0062] Please refer to Figure 1, which is a schematic diagram of the membrane structure of the appearance structural component in one scheme.

[0063] As shown in FIG. 1, the appearance structure 100' includes a base body 10' and a film layer 20' covering the outer surface 11' of the base body 10'. When natural light is incident on the film layer 20', due to thin film interference, some bands of light are enhanced, and some bands of light are weakened, so that the film layer 20' presents a specific color. The band range of the light that is enhanced or weakened is determined by the thickness and the refractive index of the film layer 20'. In order to make the film layer 20' present red, a plurality of TiAlN layers 21' and TiAlON layers 22' are arranged repeatedly along the thickness direction Z' of the film layer, so as to adjust the thickness and the refractive index of the film layer 20'. However, due to the large number of the TiAlN layers 21' and the TiAlON layers 22', the extinction coefficient of the film layer 20' is high, and the color presented is dark. In addition, the refractive index difference between the TiAlN layers 21' and the TiAlON layers 22' is small, and the refractive index difference determines the reflection bandwidth, which can be understood as the band width of the light with high reflectivity in the reflection spectrum of the film layer 20'. The band of the light that is enhanced in the film layer 20' is wide, while the band range of the light with Chinese red color is narrow, so that the film layer 20' is difficult to present bright Chinese red. In addition, the outermost layer of the film layer 20' is an Al2O3 layer 23', and the wear resistance of Al2O3 is poor, so that the wear resistance of the film layer 20' is poor.

[0064] Some other solutions make the film layer present a specific color by combining anodization, polishing and dyeing. However, the cost of this technology is high, and the brightness of the film layer is poor, and the color presented is not bright enough. In addition, this method is not suitable for appearance structure made of non-metallic materials such as plastic.

[0065] It can be seen that in some solutions, the appearance structure of the terminal device is difficult to present bright Chinese red, and cannot meet the needs of consumers.

[0066] To solve the above technical problems, the embodiment of the present application provides an appearance structure. By improving the film layer structure of the appearance structure, the appearance structure is not prone to color mixing or even color mixing, and can better present a target color (for example, bright Chinese red or other colors that consumers like), and the film layer has high reliability, thereby meeting the needs of users.

[0067] The embodiment of the present application also provides a terminal device, and the terminal device adopts the appearance structure provided by the present application. It should be noted that the terminal device includes but is not limited to a mobile phone, a display, a notebook computer, a tablet computer, a wearable device, a vehicle-mounted device, etc. Hereinafter, the terminal device is taken as a mobile phone, and the appearance structure is taken as a shell of the mobile phone.

[0068] Please refer to FIG. 2a-2c, FIG. 2a is a structural schematic diagram of the back view of the terminal device of the embodiment of the present application; FIG. 2b is an exploded structural schematic diagram of the terminal device of the embodiment of the present application; FIG. 2c is a sectional view of the terminal device of the embodiment of the present application along A-A.

[0069] As shown in FIG. 2a-2b, the terminal device 100 comprises a housing 20 and a screen 10. The screen 10 is fixedly installed on the housing 20 and is used for displaying images, and the specific type thereof is not limited, which can be but is not limited to an organic light-emitting diode (OLED) screen, an active-matrix organic light-emitting diode (AMOLED) screen, a mini organic light-emitting diode screen, a micro organic light-emitting diode screen, a micro organic light-emitting diode screen, or a quantum dot light emitting diode (QLED) screen, etc. The housing 20 is formed with an accommodating space 30 for accommodating components of the terminal device 100 and plays a role of protecting the terminal device 100 and supporting the screen 10,

[0070] As can be understood by those skilled in the art, the specific structure of the housing 20 is not limited, as shown in FIG. 2b-2c, in one possible implementation, the housing 20 comprises a middle frame 21 and a back cover 22, the middle frame 21 comprises a bottom plate 211 and a frame 212 which is annularly arranged and connected to the outer peripheral side of the bottom plate 211. As shown in FIG. 2c, the screen 10 and the back cover 22 are arranged on both sides of the bottom plate 211 of the middle frame 21 along the thickness direction X of the terminal device, the bottom plate 211 comprises a first surface 2111 and a second surface 2112 which are oppositely arranged along the thickness direction X of the terminal device, the first surface 2111, the frame 212 and the screen 10 jointly form a first mounting cavity 31, the second surface 2112, the frame 212 and the back cover 22 jointly form a second mounting cavity 32, and the first mounting cavity 31 and the second mounting cavity 32 form the above-mentioned accommodating space 30. The first mounting cavity 31 and the second mounting cavity 32 can be used for mounting elements such as a battery, a circuit board, a camera module, a speaker module, a chip, etc.

[0071] As shown in FIGS. 2a-2c, the frame 212 is a structure surrounding the periphery of the terminal device 100. In a possible implementation, the frame 212 can extend around the periphery of the terminal device 100 and the screen 10, and specifically can surround the four sides of the screen 10 to help fix the screen 10.

[0072] It should be noted that the bottom plate 211 and the frame 212 can be an integrated structure or a split structure, and the application does not limit this. When the bottom plate 211 and the frame 212 are an integrated structure, they can be assembled by permanent connection methods such as welding and integrated molding. When the bottom plate 211 and the frame 212 are a split structure, the bottom plate 211 and the frame 212 are two different components of the shell 20, and they can be assembled together by methods such as clamping and buckling, and can be separated when disassembly is needed.

[0073] It should be noted that the material of the middle frame 21 is not limited, and can be a metal middle frame such as titanium alloy, aluminum alloy, magnesium alloy, etc., or a non-metal middle frame such as plastic, glass, ceramic, etc., and the application does not limit this.

[0074] As shown in FIGS. 2a-2c, the back cover 22 is a structure arranged opposite to the screen 10 on the terminal device 100, connected with the middle frame 21, used to seal the components of the terminal device 100 inside the terminal device 100, and can also prevent dust, prevent collision, prevent hardware scratching, etc. The back cover 22 can be made of metal materials such as magnesium alloy, stainless steel, etc., or non-metal materials such as glass, plastic, plastic, etc., and the application does not limit this.

[0075] It should be noted that the middle frame 21 and the back cover 22 can be an integrated structure or a split structure, and the application does not limit this. In a possible implementation, the middle frame 21 and the back cover 22 are a split structure, and the middle frame 21 and the back cover 22 are two different components of the shell 20, and they can be assembled together by methods such as clamping and buckling, and can be separated when disassembly is needed. In an alternative implementation, the middle frame 21 and the back cover 22 are an integrated structure. In another alternative implementation, the shell 20 of the terminal device 100 can also not include a separately arranged back cover 22, but the bottom plate 211 of the middle frame 21 can be used as the back cover 22, and the application does not limit this.

[0076] As can be understood by those skilled in the art, in the terminal device 100 as shown in FIGS. 2a-2b, the shell 20 serves as an appearance structural member 400 (or can be understood as the appearance structural member 400 mentioned below can be at least part of the structure of the shell 20, for example, can be the middle frame 21 of the shell 20, or the back cover 22 of the shell 20, etc.), the outer surface 501 of the base body 50 is covered with the film layer 60 (see FIG. 3a), and the film layer 60 away from the surface 501 of the base body 50 along the thickness direction Z of the film layer constitutes the outer surface of the terminal device 100 (the outer surface of the terminal device 100 can be, for example, the outer wall surface of the outer frame 212 of the middle frame 21, the outer surface of the back cover 22, etc.), which can be understood as the appearance surface of the terminal device 100. After the light is shot to the film layer 60, the film layer will exhibit a specific color due to thin film interference, that is, the outer surface of the terminal device 100 can have a specific color, meeting the needs of consumers for the appearance of the terminal device 100. It should be noted that the surface of the appearance structural member 400 away from the base body 50 can constitute the entire outer surface of the terminal device 100, or can only constitute part of the outer surface of the terminal device 100, which is not limited in the present application.

[0077] The specific structure of the appearance structural member 400 with the outer surface 501 covered with the film layer 60 will be described below with reference to the accompanying drawings. It should be noted that in other terminal devices, the appearance structural member can also adopt the structure in the present application, and the type of the terminal device and its appearance structural member is not limited, for example, it can be a tablet computer and its shell, a smart watch and its watchband, smart glasses and its frame, leg, etc., which is not limited in the present application. As can be understood by those skilled in the art, the appearance structural member 400 can be understood as a structural member at least partially located outside the terminal device 100, that is, at least part of the outer surface of the appearance structural member 400 is exposed to the outside of the terminal device 100, constituting the appearance surface of the terminal device 100.

[0078] Please refer to FIGS. 3a-3b, FIG. 3a is a structural schematic diagram of the base body and the medium stack layer of the first appearance structural member of the present application; and FIG. 3b is a reflection spectrum diagram of the first appearance structural member of the present application.

[0079] It should be noted that the reflection spectrum diagram shown in FIG. 3b reflects the law of the reflectivity of the film layer 60 changing with the wavelength of the incident light, and the curve obtained by taking the incident wavelength as the abscissa and the reflectivity as the ordinate is the reflection spectrum characteristic curve of the film layer 60.

[0080] As shown in FIG. 3a, the embodiment of the present application provides an appearance structure 400, comprising a base 50 and a film layer 60, wherein the base 50 has an outer surface 501, and the film layer 60 is arranged on the outer surface 501 of the base 50. It should be noted that the material of the base 50 is not limited, which can be an alloy (titanium alloy, magnesium alloy, aluminum alloy, etc.), plastic, etc. In a possible implementation, the material of the base 50 is TC4 titanium alloy, and in an alternative implementation, the material of the base 50 is aluminum alloy. The film layer 60 is configured as a color developing structure. The color developing structure can be understood as a structure that enables the film layer 60 to present a color (for example, red, green, purple, etc.). From the appearance, the film layer 60 displays a color, for example, the principle of thin film interference mentioned below can enable the visible light incident on the film layer 60 to be reflected, the wave band of the reflected light includes a target wave band corresponding to a target color, and thus the film layer presents the target color.

[0081] The film layer 60 comprises a dielectric stack layer 61, and the number of layers of the dielectric stack layer 61 is not limited, which can be 1 layer, 2 layers, 3 layers, etc., and the present application does not limit this. Each layer of the dielectric stack layer 61 comprises a first dielectric layer 611 and a second dielectric layer 612 arranged in a stacking manner along the thickness direction Z of the film layer. The materials of the first dielectric layer 611 and the second dielectric layer 612 are different, and the refractive index of the second dielectric layer is different from the refractive index of the first dielectric layer.

[0082] The appearance structure 400 provided by the present application can enable the visible light incident on the film layer 60 to be reflected by adjusting the refractive index and thickness of the first dielectric layer 611 and the second dielectric layer 612 in the dielectric stack layer 61, the wave band of the reflected light includes a target wave band corresponding to a target color, and the light wave reflectivity of the target wave band is large, which can better realize the target color. The reflectivity can be understood as the ratio of the reflected light intensity to the incident light intensity after the light is incident on the film layer 60 from the outside.

[0083] Further, the difference in refractive index between each layer of the film layer 60 determines the reflection bandwidth. The reflection bandwidth can be understood as the wave band width of the light with high reflectivity in the reflection spectrum of the film layer 60. By adjusting the difference in refractive index between the first dielectric layer 611 and the second dielectric layer 612, the reflection bandwidth can be matched with the wave band range corresponding to the target color, so that the film layer is not prone to color mixing or even does not mix colors, which ensures that the film layer can better present the target color, and the purity of the target color is high.

[0084] Therefore, the appearance structure 400 provided by the present application can enable the film layer 60 to not be prone to color mixing or even not to mix colors by adjusting the refractive index and thickness of the first dielectric layer 611 and the second dielectric layer 612 in the dielectric stack layer 61, which can better present the target color (for example, Chinese red color or other colors that consumers like), and meet the needs of consumers.

[0085] It should be noted that the difference between the refractive index of the second medium layer 612 and the refractive index of the first medium layer 611 is not limited, and the target color that the appearance structure 400 needs to present is not limited. As shown in FIG. 3a, in a possible implementation, the difference between the refractive index of the second medium layer 612 and the refractive index of the first medium layer 611 is greater than or equal to 2, for example, can be 2, 2.2, 2.5, 2.9, 3.2, etc., which is not limited in the present application. It is understood in combination with FIG. 3b that the medium layer stack 61 is configured such that after the visible light is incident on the film layer 60, the reflected light has a wavelength band of 630nm-700nm (in one example, the reflected light has a wavelength band of 620nm-760nm; in another example, the reflected light has a wavelength band of 620nm-700nm; in yet another example, the reflected light has a wavelength band of 630nm-700nm, which is not limited in the present application), and the reflectivity of light with a wavelength of 630nm-700nm is greater than or equal to 60%. It should be noted that the reflectivity of 630nm-700nm is not limited, for example, it can be 60%, 70%, 80%, 90%, 95%, 100%, etc., which is not limited in the present application. 630nm-700nm is the red light band, which can also be understood as the reflected light being red light after the visible light is incident on the film layer 60. The light with a wavelength of 420nm-580nm is absorbed by the film layer 60, which can also be understood as the reflectivity of light with a wavelength of 420nm-580nm being less than 20% (or less than 15%, or less than 10%, or less than 5%, etc.), for example, 20%, 15%, 10%, 5%, 3%, etc., which is not limited in the present application.

[0086] The appearance structure 400 provided in the present application includes the first medium layer 611 and the second medium layer 612 which are stacked and have a large difference (greater than or equal to 2) in refractive index. The visible light incident on the film layer 60 is reflected, the reflected light has a wavelength band of 630nm-700nm, and the reflectivity of light with a wavelength of 630nm-700nm is greater than or equal to 60%, and 630nm-700nm is in the red light band. The light with a wavelength other than the red light band is absorbed. The film layer 60 has strong ability to reflect red light and weak ability to reflect visible light with a wavelength other than the red light band, so that the film layer 60 appears red to the consumer.

[0087] Further, as shown in the reflectance spectrum of FIG. 3b, the reflection bandwidth is about 70 nm (630 nm-700 nm wavelength range, high light reflectivity, close to 100%). Those skilled in the art can understand that the wavelength range corresponding to the Chinese red color in the red light is narrow, and the difference between the refractive index of the first medium layer 611 and the refractive index of the second medium layer 612 is greater than or equal to 2, which can match the reflection bandwidth with the wavelength range of the light of Chinese red color, so that the film layer 60 does not occur color mixing, and ensures that the film layer 60 can present Chinese red, and the color purity of Chinese red is high.

[0088] Therefore, the appearance structure 400 provided in the present application can present Chinese red color, and meet the needs of consumers.

[0089] As shown in FIG. 3b, in a possible implementation, the reflectivity of the light wave in the 630 nm-700 nm wavelength range is greater than or equal to 80%, for example, it can be 80%, 85%, 90%, 95%, etc. In a possible implementation, the reflectivity of the light wave in the 630 nm-700 nm wavelength range is close to 100%. The light in the 630 nm-700 nm wavelength range is Chinese red color, and it can also be understood that the light of Chinese red color has high reflectivity.

[0090] Referring to FIG. 4, FIG. 4 is a schematic diagram of the appearance structure of the embodiment of the present application.

[0091] It should be noted that FIG. 4 is to facilitate the explanation of the principle of thin film interference, taking the incident light O1 incident on the film layer 60 in the thickness direction Z of the film layer as an example, and the two columns of reflected light (reflected light O2 and reflected light O3) generated by the incident light O1 on the upper and lower surfaces of the film layer 60 are drawn staggered in the left and right directions (in fact, the incident light incident perpendicular to the surface of the film layer 60 and the reflected light generated thereby coincide).

[0092] As shown in FIG. 4, due to the different refractive indices of the external environment (such as air), the film layer 60 and the substrate 50 for light, after the incident light O1 is incident on the film layer 60, it is reflected on the two surfaces of the film layer 60 arranged in the opposite direction along the thickness direction Z thereof, generating reflected light O2 and reflected light O3, and the two columns of reflected light interfere with each other. There is a phase difference between the reflected light O2 and the reflected light O3. Due to the wave nature of light, the superposition between the reflected light O2 and the reflected light O3 can enhance the interference light (when the wave peak of the reflected light O2 and the wave peak of the reflected light O3 coincide, that is, the phase difference is an integer multiple of 2π), or weaken the interference light (when the wave peak of the reflected light O2 and the wave valley of the reflected light O3 are opposite, that is, the phase difference is an odd multiple of π). Those skilled in the art can understand that the phase difference between the reflected light O2 and the reflected light O3 is related to the optical path difference, specifically, wherein λ is the wavelength, and Δ is the optical path difference, is the phase difference between the reflected light O2 and the reflected light O3. The optical path difference can be understood as the difference in the geometric distance of the two light beams. As shown in FIG. 4, when the incident light is incident on the film layer 60 in parallel to the thickness direction Z of the film layer, the optical path difference between the reflected light O2 and the reflected light O3 is 2nd, where n is the effective refractive index of the film layer 60, which is related to the refractive index of the first dielectric layer 611 and the refractive index of the second dielectric layer 612, and d is the total thickness of the film layer 60. Therefore, by adjusting the refractive index and the thickness of the first dielectric layer 611 and the second dielectric layer 612, the effective refractive index and the thickness of the film layer 60 can be adjusted, so that the interference light of the Chinese red color is enhanced, and the interference light of other colors is weakened.

[0093] In a possible implementation, the refractive index of the first dielectric layer 611 is 1.4-1.9, for example, 1.4, 1.5, 1.6, 1.7, 1.9, etc., which is not limited in the present application, and the refractive index of the second dielectric layer 612 is 4-5, for example, 4, 4.2, 4.6, 4.8, 5, etc., which is not limited in the present application. In an example, the refractive index of the first dielectric layer 611 is 1.48, the refractive index of the second dielectric layer 612 is 4.32, and the refractive index difference between the first dielectric layer 611 and the second dielectric layer 612 is 2.84. It should be noted that in other alternative implementations, the refractive index of the first dielectric layer 611 can also be less than 1.4, for example, 1.3, 1.2, 1.1, etc., or greater than 1.9, for example, 2, 2.1, 2.2, etc., and the refractive index of the second dielectric layer 612 can also be less than 4, for example, 3.5, 3.7, 3.8, etc., or greater than 5, for example, 5.2, 5.4, 5.5, etc., which is not limited in the present application.

[0094] In a possible implementation, the thickness of the first dielectric layer 611 is 120nm-250nm, for example, 120nm, 140nm, 160nm, 200nm, 250nm, etc., which is not limited in the present application. The thickness of the second dielectric layer 612 is less than or equal to 100nm, for example, 100nm, 80nm, 60nm, 40nm, etc., which is not limited in the present application. It should be noted that in other alternative implementations, the thickness of the first dielectric layer 611 can also be less than 120nm, for example, 110nm, 105nm, 100nm, etc., or greater than 250nm, for example, 260nm, 270nm, 280nm, etc., and the thickness of the second dielectric layer 612 can also be greater than 100nm, for example, 110nm, 120nm, 130nm, etc., which is not limited in the present application.

[0095] It should be noted that the material of the first dielectric layer 611 and the second dielectric layer 612 is not limited. Those skilled in the art can understand that the refractive index of the dielectric layer is related to the material of the dielectric layer. As shown in FIG. 3a, in one possible implementation, the material of the first dielectric layer 611 is SiyONx, x and y are positive numbers, wherein the values of x and y are not limited, for example, x is 1, y is 1, that is, SiON, or x is 1, y is 2, SiON2, or x is 3, y is 4, that is, Si3ON4, and the like, which are not limited in the present application. The material of the second dielectric layer 612 is amorphous silicon (a-Si), also known as amorphous silicon. The materials of the first dielectric layer 611 and the second dielectric layer 612 are both based on silicon, so that the bonding performance between them is good and they are not easy to separate, and the reliability of the film layer 60 is high. Moreover, silicon has high hardness and good wear resistance, which is conducive to improving the wear resistance of the film layer 60 as a whole.

[0096] It can be understood that by adjusting the ratio of y and x in SiyONx, the thermal expansion coefficient of the first dielectric layer 611 can be adjusted to match the substrate 50 of different materials.

[0097] Those skilled in the art can understand that the structure of the film layer 60 in the present application is not only suitable for making the appearance structure 400 present a bright Chinese red color, but also can make the appearance structure 400 present other different colors by adjusting the structure of the film layer 60, which is not limited in the present application. That is, the difference between the refractive index of the second dielectric layer 612 and the refractive index of the first dielectric layer 611 in the dielectric stack 61 of the film layer 60 is not limited to being greater than or equal to 2, and the reflection spectrum of the light incident on the film layer 60 is also not limited to the scenarios described above.

[0098] As shown in FIG. 3a, in one possible implementation, in the film layer 60 of the appearance structure 400, the material of the first dielectric layer 611 is SiyONx, y and x are positive numbers. The refractive index of SiyONx can be adjusted by adjusting the ratio between x and y, and the second dielectric layer 612 with high refractive index is matched to make the film layer 60 present different colors, such as Chinese red, blue, purple, and the like. Moreover, amorphous silicon has a certain extinction coefficient, and the brightness of the color of the film layer 60 can be adjusted by adjusting the thickness of the second dielectric layer 612. Therefore, the film layer 60 can present different colors by adjusting the element ratio of the first dielectric layer 611, which is a simple method and can meet the differentiated needs of consumers.

[0099] As shown in FIG. 3a, in a possible implementation, the substrate 50 is made of TC4 titanium alloy, and the outer surface 501 of the substrate 50 is covered with the first dielectric layer 611 made of SiON. It can also be understood that, in the material SiyONx of the first dielectric layer 611, the value of y is 1 and the value of x is 1. The bonding force between the film layer 60 and the substrate 50 is related to the difference between the thermal expansion coefficients of the material of the layer of the film layer 60 covering the outer surface 501 of the substrate 50 and the substrate 50. The smaller the difference between the thermal expansion coefficients, the stronger the bonding between the film layer 60 and the substrate 50. The difference between the thermal expansion coefficients of SiON and TC4 titanium alloy is less than 10%. In other alternative implementations, the materials of the first dielectric layer 611 and the second dielectric layer 612 can also be other materials, which are not limited in the present application. Further, the hardness of SiON is 1500HV, and the relatively large hardness is beneficial to improve the wear resistance of the film layer 60.

[0100] It can be understood by those skilled in the art that the extinction coefficient of the dielectric layer is also related to the material of the dielectric layer. The first dielectric layer 611 and the second dielectric layer 612 are made of silicon, and silicon has a certain light absorption capacity, which can adjust the brightness of the color presented by the film layer 60. In a possible implementation, the extinction coefficient of the first dielectric layer 611 is 0-0.002, for example, 0, 0.001, 0.0014, 0.0016, 0.002, and the like, which are not limited in the present application. In other alternative implementations, the extinction coefficient of the first dielectric layer 611 can also be greater than 0.002, for example, 0.003, 0.0035, 0.004, and the like, which are not limited in the present application. The extinction coefficient of the second dielectric layer 612 is 0.1-0.8, for example, 0.1, 0.2, 0.5, 0.7, 0.8, and the like, which are not limited in the present application. In other alternative implementations, the extinction coefficient of the second dielectric layer 612 can also be less than 0.1, for example, 0.008, 0.007, 0.006, or greater than 0.8, for example, 0.85, 0.88, 0.9, and the like, which are not limited in the present application. In one example, the extinction coefficient of the first dielectric layer 611 is 0.0012, and the extinction coefficient of the second dielectric layer 612 is 0.718. The extinction coefficients of the first dielectric layer 611 and the second dielectric layer 612 are relatively small, which is beneficial to reduce the overall extinction coefficient of the film layer 60, and further makes the presented color brighter. Further, the thickness of the second dielectric layer 612 with a relatively high extinction coefficient is smaller, which is beneficial to make the color presented by the film layer 60 brighter.

[0101] Please refer to FIG. 5a-5d, FIG. 5a is a structural schematic diagram of an appearance structure of an embodiment of the present application, wherein the medium stack layer is 3 layers; FIG. 5b is a structural schematic diagram of an appearance structure of an embodiment of the present application, wherein the film layer comprises an abrasion-resistant layer; FIG. 5c is a structural schematic diagram of an appearance structure of an embodiment of the present application, wherein the film layer comprises a transition layer; FIG. 5d is a structural schematic diagram of an appearance structure of an embodiment of the present application, wherein the film layer comprises a waterproof layer.

[0102] As shown in FIG. 5a, in a possible implementation, the film layer 60 comprises 3 layers of medium stack layers 61 arranged in a stack along the thickness direction Z of the film layer. It can also be understood that the 3 first medium layers 611 and the 3 second medium layers 612 are arranged in a stack along the thickness direction Z of the film layer in turn. The 3 layers of medium stack layers 61 are conducive to improving the color stability of the film layer 60, ensuring the color uniformity of the appearance structure 400 of each batch, reducing the color difference, and ensuring that the number of layers of the medium stack layers 61 is not too much, the extinction coefficient of the film layer 60 is appropriate, and the color presented is relatively bright. In other alternative implementations, the number of layers of the medium stack layers 61 can be more than 3 layers, for example, 4 layers, 5 layers, etc., or less than 3 layers, for example, 1 layer, 2 layers, etc., which are not limited in the present application.

[0103] It should be noted that the thickness of each layer of the first medium layer 611 can be the same or different, and by analogy, the thickness of each layer of the second medium layer 612 can be the same or different. As shown in FIG. 5a, in a possible implementation, along the thickness direction Z of the film layer from bottom to top, the thickness of each layer of the first medium layer 611 gradually increases, for example, in turn 140 nm, 140 nm, 160 nm, and the thickness of each layer of the second medium layer 612 first remains unchanged and then increases, for example, in turn 42 nm, 42 nm, 45 nm. In other alternative implementations, along the thickness direction Z of the film layer, the thickness of each layer of the first medium layer 611 and each layer of the second medium layer 612 can also have other feasible combinations, which are not limited in the present application.

[0104] As shown in FIG. 5a, in combination with FIG. 3b, in an example, the film layer 60 presents a color with Lab values of L=38.0, a=48.6, b=37.6, and in another example, the film layer 60 presents a color with Lab values of L=46, a=49, b=18. It can also be understood that the color presented by the film layer 60 is bright red, and the red is Chinese red.

[0105] As shown in FIG. 5b, in a possible implementation, the film layer 60 further includes an abrasion-resistant layer 62. In the thickness direction Z of the film layer, each of the multilayer dielectric stack layers 61 is arranged between the abrasion-resistant layer 62 and the substrate 50, and it can also be understood that the abrasion-resistant layer 62 is arranged on the side of the multilayer dielectric stack layers 61 away from the substrate 50 in the thickness direction Z of the film layer, to protect the dielectric stack layers 61 and improve the abrasion resistance and corrosion resistance of the film layer 60. It can be understood that the hardness of the abrasion-resistant layer 62 is greater than the hardness of the first dielectric layer 611 and the second dielectric layer 612, and the specific hardness value is not limited, which can be 2000 HV, 2500 HV, 3000 HV, etc., and the present application does not make any limitation. It should be noted that, in an alternative implementation, the film layer 60 can also not be provided with the abrasion-resistant layer 62, and the present application does not make any limitation.

[0106] It should be noted that the material of the abrasion-resistant layer 62 is not limited, which can be a wear-resistant material such as a ceramic material or a polymer composite material. In a possible implementation, the material of the abrasion-resistant layer 62 is ta-C, with a hardness of 3000 HV, so that the film layer 60 can withstand the vibration abrasion test for more than 1 hour and the steel wool friction test for more than 4000 times, and the film layer 60 has good abrasion resistance. The sp 3 The key content is 40% to 60%, which has good temperature resistance and is conducive to improving the user experience. The refractive index of ta-C is 2 to 3, for example, 2, 2.1, 2.5, 2.7, 2.9, 3, etc., and the present application does not make any limitation, and the extinction coefficient is 0.1 to 0.4, for example, 0.1, 0.15, 0.3, 0.38, 0.4, etc., and the present application does not make any limitation. In one example, the refractive index of the abrasion-resistant layer 62 is 2.6, and the extinction coefficient is 0.36. In other alternative implementations, the refractive index of the abrasion-resistant layer 62 can be less than 2, for example, 1.9, 1.8, 1.7, etc., or greater than 3, for example, 3.1, 3.2, 3.3, etc. The extinction coefficient of the abrasion-resistant layer 62 can also be less than 0.1, for example, 0.08, 0.07, 0.06, etc., or greater than 0.4, for example, 0.45, 0.5, 0.55, etc., and the present application does not make any limitation.

[0107] As shown in FIG. 5b, in a possible implementation, the thickness of the abrasion-resistant layer 62 is less than or equal to 15 nm, for example, 15 nm, 12 nm, 10 nm, 8 nm, etc., and the present application does not make any limitation. In a possible implementation, the thickness of the abrasion-resistant layer 62 is 10 nm. It can be understood by those skilled in the art that, on the one hand, the thickness of the abrasion-resistant layer 62 is small, which is conducive to making the total thickness of the film layer 60 small, so that the appearance structure 400 is light and thin. On the other hand, the thickness of the abrasion-resistant layer 62 is small, which does not affect the brightness of the color presented by the film layer 60.

[0108] As shown in FIG. 5c, in a possible implementation, the film layer 60 further comprises a transition layer 63, which is arranged between the multilayer dielectric stack 61 and the wear-resistant layer 62 in the thickness direction Z of the film layer. The transition layer 63 is arranged between the wear-resistant layer 62 and the dielectric stack 61 closest to the wear-resistant layer 62, so that the refractive index of the transition layer 63 is less than the refractive index of the wear-resistant layer 62, which is conducive to ensuring that there is a large refractive index difference between the layers of the film layer 60, and in turn ensuring the reflection bandwidth of the reflection spectrum of the film layer 60. It can also be understood that the transition layer 63 and the wear-resistant layer 62 together constitute a dielectric stack 61. In an alternative implementation, the film layer 60 can also not be provided with the transition layer 63, and the present application does not limit this.

[0109] The material and refractive index of the transition layer 63 are not limited, as long as there is a certain difference between the transition layer 63 and the wear-resistant layer 62 and the second dielectric layer 612. In a possible implementation, the material of the transition layer 63 is SiyONx, and x and y are positive numbers. It can be understood that the material of the transition layer 63 is the same as that of the first dielectric layer 611. This reduces the processing complexity and reduces the cost.

[0110] The refractive index of the transition layer 63 is 1.4-1.9, for example, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, etc., which is not limited in the present application. In one example, the refractive index of the transition layer 63 is 1.48. In other alternative implementations, the refractive index of the transition layer 63 can also be less than 1.4, for example, 1.3, 1.2, 1.1, etc., or greater than 1.9, for example, 2, 2.1, 2.2, etc., which is not limited in the present application. The thickness of the transition layer 63 is 120-250 nm, for example, 120 nm, 140 nm, 160 nm, 200 nm, 230 nm, 250 nm, etc., which is not limited in the present application. In one example, the thickness of the transition layer 63 is 240 nm. In other alternative implementations, the thickness of the transition layer 63 can also be less than 120 nm, for example, 115 nm, 110 nm, 105 nm, etc., or greater than 250 nm, for example, 260 nm, 270 nm, 280 nm, etc., which is not limited in the present application. As shown in FIG. 5d, in one possible implementation, the film layer 60 further includes a waterproof layer 64. In the thickness direction Z of the film layer, the waterproof layer 64 is the layer farthest from the substrate 50, and it can also be understood that the first dielectric layer 611, the second dielectric layer 612, the transition layer 63 and the wear-resistant layer 62 of the film layer 60 are all arranged between the waterproof layer 64 and the substrate 50. The waterproof layer 64 can play the role of anti-fouling and waterproof, thus protecting other layers and improving the performance of the film layer 60 and the user experience. It should be noted that the material of the waterproof layer 64 is not limited, and in one possible implementation, the material of the waterproof layer 64 is Si-F. The surface free energy of Si-F is low, so that the water droplet contact angle on the side surface of the waterproof layer 64 away from the substrate 50 in the thickness direction Z of the film layer is greater than 120°. The greater the water droplet contact angle, the better the hydrophobicity of the surface, so that the waterproof layer 64 can make the film layer 60 have the effect of hydrophobicity and anti-fingerprint. In an alternative scheme, the material of the waterproof layer 64 is Si-O-F, which is not limited in the present application. It should be noted that in an alternative implementation, the waterproof layer 64 can also not be provided, which is not limited in the present application.

[0111] In one possible implementation, the thickness of the waterproof layer 64 ranges from 1 to 2 nm, for example, 1 nm, 1.2 nm, 1.3 nm, 1.5 nm, 2 nm, etc., which is not limited in the present application. The thickness of the waterproof layer 64 is very small, and the color is close to transparent, which does not affect the color presented by the film layer 60 and is conducive to the thinning of the film layer 60 while making the film layer 60 have the waterproof function. In an alternative implementation, the film layer 60 can also not be provided with the waterproof layer 64, which is not limited in the present application.

[0112] It should be noted that the material constituting the film layer 60 is an insulating material, so that the resistivity of the film layer 60 is greater than 1 GΩ, for example, 2 GΩ, 3 GΩ, 4 GΩ, etc., which is not limited in the present application. In an example, the resistivity of the film layer 60 is greater than 4 GΩ. The film layer 60 is an insulator and does not interfere with the signal transmission of the mobile terminal.

[0113] It should be noted that the preparation process of the film layer 60 is not limited. In a possible implementation, the first dielectric layer 611, the second dielectric layer 612 and the transition layer 63 are deposited by a magnetron sputtering method, the wear-resistant layer 62 is deposited by a multi-arc ion plating, and the waterproof layer 64 is formed by coating. The magnetron sputtering and multi-arc ion plating are combined, which has a low cost, is suitable for mass production, and has a firm connection between layers, and the film layer 60 has good reliability. The film layer 60 can also be prepared by other process methods, which is not limited in the present application.

[0114] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application belong to the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. An appearance structure member for a terminal device, characterized by, The appearance structure comprises: a base body having an outer surface; a film layer arranged on the outer surface of the base body and configured as a color developing structure; wherein the film layer comprises at least one layer of a medium stack, each layer of the at least one layer of the medium stack comprises a first medium layer and a second medium layer which are arranged in a stack along a thickness direction and have different materials, and the second medium layer has a different refractive index from the first medium layer.

2. The appearance structure of claim 1, wherein The material of the first medium layer is SiyONx, x and y are positive numbers, and the material of the second medium layer is amorphous silicon.

3. The appearance structure of claim 2, wherein The material of the base body is an alloy material or a plastic, and the first medium layer is a layer of the medium stack which is closest to the base body along the thickness direction. When the material of the base body is a titanium alloy or an aluminum alloy, the value of y in the material SiyONx of the first medium layer is 1, and the value of x is 1.

4. The appearance structure according to any one of claims 1 to 3, wherein The difference between the refractive index of the second medium layer and the refractive index of the first medium layer is greater than or equal to 2, and the at least one layer of the medium stack is configured such that, after visible light is incident on the film layer, the wavelength band of the reflected light includes 630-700 nm, and the reflectivity of the light wave in the 630-700 nm wavelength band is greater than or equal to 60%.

5. The appearance structure of claim 4, wherein After visible light is incident on the film layer, the light wave in the 420-580 nm wavelength band is absorbed by the film layer.

6. The appearance structure according to claim 4 or 5, wherein The reflectivity of the light wave in the 630-700 nm wavelength band is greater than or equal to 80%.

7. The appearance structure according to any one of claims 1 to 6, wherein The refractive index of the first medium layer is 1.4-1.9, and the refractive index of the second medium layer is 4-5.

8. The appearance structure of claim 7, wherein The extinction coefficient of the first medium layer is 0-0.002, and the thickness is 120-250 nm. The extinction coefficient of the second medium layer is 0.1-0.8, and the thickness is less than or equal to 100 nm.

9. The appearance structure according to any one of claims 1 to 8, wherein The at least one layer of the medium stack is a plurality of layers of the medium stack arranged in a stack along the thickness direction of the film layer.

10. The appearance structure of claim 9, wherein The plurality of layers of the medium stack is three layers of the medium stack.

11. The appearance structure according to any one of claims 1 to 10, wherein The film layer further comprises a wear-resistant layer, and the at least one layer of the medium stack is arranged between the wear-resistant layer and the base body along the thickness direction of the film layer. The hardness of the wear-resistant layer is greater than the hardness of the first medium layer and the second medium layer.

12. The appearance structure of claim 11, wherein The material of the wear-resistant layer is ta-C. The thickness of the wear-resistant layer is less than or equal to 15 nm.

13. The appearance structure according to claim 11 or 12, wherein The film layer further comprises a transition layer, and the transition layer is arranged between the at least one layer of the medium stack and the wear-resistant layer along the thickness direction of the film layer, and the refractive index of the transition layer is less than the refractive index of the wear-resistant layer.

14. The appearance structure of claim 13, wherein The material of the transition layer is SiyONx, x and y are positive numbers, the thickness of the transition layer is 120-250 nm, and the refractive index is 1.4-1.

9. The refractive index of the wear-resistant layer is 2-3.

15. The appearance structure according to any one of claims 1 to 14, wherein The film layer further comprises a waterproof layer, and the waterproof layer is arranged in a stack with the at least one layer of the medium stack along the thickness direction of the film layer, and the waterproof layer is a layer of the film layer which is farthest from the base body.

16. The appearance structure of claim 15, wherein The material of the waterproof layer is Si-O-F or Si-F.

17. The appearance structure of claim 16, wherein The thickness of the waterproof layer is 1-2 nm.

18. The appearance structure according to any one of claims 1 to 17, wherein The appearance structure is a shell or a watchband.

19. A terminal device, comprising: An appearance structure including the appearance structure as recited in any one of claims 1 to 18, in which the surface of the film layer opposite to the base constitutes at least a part of the outer surface of the terminal device.

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