Appearance structural member for terminal equipment and terminal equipment

Abstract

The utility model provides an appearance structural member for terminal equipment and the terminal equipment, the appearance structural member comprises a base body and a film layer, and the film layer covers the outer surface of the base body and is configured as a color development structure. The film layer comprises at least one dielectric stacking layer, each dielectric stacking layer comprises a first dielectric layer and a second dielectric layer which are stacked in the thickness direction of the dielectric stacking 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. By adjusting the refractive indexes and the thicknesses of the first dielectric layer and the second dielectric layer in the dielectric stacking layer, the film layer is not prone to color mixing or even free of color mixing, the target color (such as Chinese red color) can be better presented, and the needs of consumers are met.

Description

Technical Field

[0001] This application relates to the technical field of terminal materials, and particularly to an appearance structure member for a terminal device and a terminal device. Background Art

[0002] The appearance structure members of terminal devices (such as mobile phone back covers, watch straps, etc.) generally include a substrate and a colored film layer covering the outer surface of the substrate. However, the medium layer material for adjusting the display color of the appearance structure member in the colored film layer is single, resulting in a relatively wide reflection light band of the colored film layer, which is prone to color mixing and difficult to present a bright target color (for example, bright Chinese red).

[0003] It can be seen that in the prior art, the appearance structure members of terminal devices are prone to color mixing, difficult to present a target color (for example, bright Chinese red), and cannot meet the needs of consumers. Utility Model Content

[0004] The embodiments of this application provide an appearance structure member for a terminal device and a terminal device, which solve the problems that the appearance structure members of terminal devices in the prior art are prone to color mixing, difficult to present a target color (for example, bright Chinese red), and cannot meet the needs of consumers.

[0005] The first aspect of the embodiments of this application provides an appearance structure member for a terminal device, including a substrate and a film layer. The substrate has an outer surface, and the film layer is disposed on the outer surface of the substrate and is configured as a color display structure.

[0006] Wherein, the film layer includes at least one dielectric stack layer, and each dielectric stack layer in the at least one dielectric stack layer includes a first dielectric layer and a second dielectric layer that are stacked along its thickness direction and have different materials, and the refractive index of the second dielectric layer is different from that of the first dielectric layer.

[0007] The appearance structure member provided by this application includes a substrate and a film layer disposed on the outer surface of the substrate. Wherein, each dielectric stack layer of the film layer includes a first dielectric layer and a second dielectric layer that are stacked and have different refractive indices. By adjusting the refractive indices and thicknesses of the first dielectric layer and the second dielectric layer, the visible light incident on the film layer can be reflected, and the reflection light band includes the target band, and the light wave reflectivity of the target band is relatively large, which can better achieve the target color. Among them, 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 shoots from the outside to the film layer.

[0008] Furthermore, the refractive index difference between the respective stacked layers of the film layer determines the reflection bandwidth. The reflection bandwidth can be understood as the band width of the light with high reflectivity in the reflection spectrum of the film layer. By adjusting the refractive index difference between the first dielectric layer and the second dielectric layer, it is possible to match the reflection bandwidth with the band range corresponding to the target color, so that the film layer is not prone to color mixing or even does not experience color mixing, ensuring that the film layer can better present the target color with high purity of the target color.

[0009] Therefore, by adjusting the refractive index and thickness of the first dielectric layer and the second dielectric layer in the dielectric stack layer, the appearance structure provided by the present application can make the film layer not prone to color mixing or even not experience color mixing, and can better present the target color (for example, Chinese red color), meeting the needs of consumers.

[0010] In a possible implementation, the material of the first dielectric layer is SiyONx, where x and y are positive numbers, and the material of the second dielectric layer is amorphous silicon. SiyONx has a lower refractive index, amorphous silicon has a high refractive index, and both have good wear resistance, which is beneficial to improving the wear resistance and corrosion resistance of the film layer while ensuring the color.

[0011] For the appearance structure provided by the present application, the material of the first dielectric layer is SiyONx, where y and x are positive numbers. The refractive index of SiyONx can be adjusted by adjusting the ratio between x and y, and combined with the second dielectric layer with a high refractive index, so that the film layer presents different colors. Amorphous silicon has a certain extinction coefficient, and the brightness of the film layer color can be adjusted by adjusting the thickness of the second dielectric layer. Therefore, the appearance structure provided by the present application can make the film layer present different colors by adjusting the element ratio of the first dielectric layer, meeting the differentiated needs of consumers.

[0012] In a possible implementation, the material of the substrate is an alloy material or plastic, and the first dielectric layer is the layer in the corresponding dielectric stack layer close to the substrate along its thickness direction. When the material of the substrate is a titanium alloy or an aluminum alloy, in the material SiyONx of the first dielectric layer, the value of y is 1 and the value of x is 1.

[0013] Adopting the above solution, the outer surface of the substrate is covered with the first dielectric layer. By adjusting the ratio of y and x in SiyONx, when the substrate is an alloy material or plastic, a good bonding force can be achieved between the substrate and the film layer, and the film layer is not easy to fall off, that is, the appearance structure is not easy to fade and has high reliability.

[0014] In a possible implementation, the difference between the refractive index of the second dielectric layer and the refractive index of the first dielectric layer is greater than or equal to 2, and at least one dielectric stack layer is configured such that after visible light is incident on the film layer, the wavelength band of the reflected light includes 630 nm to 700 nm, and the light wave reflectivity in the 630 nm to 700 nm wavelength band is greater than or equal to 60%. Among them, 630 nm to 700 nm is in the red light wavelength band. And the film layer has a strong ability to reflect red light, making the film layer appear red to the consumer. Moreover, the difference between the refractive index of the first dielectric layer and the refractive index of the second dielectric layer is greater than or equal to 2, so that the reflection bandwidth matches the wavelength band range corresponding to the Chinese red color in red light, thereby preventing color mixing in the film layer, ensuring that the film layer can present Chinese red, and the color purity of Chinese red is high.

[0015] In a possible implementation, after visible light is incident on the film layer, the light waves in the 420 nm to 580 nm wavelength band are absorbed by the film layer. This can absorb the light in the non-red light wavelength band (420 nm to 580 nm), avoid the influence of the non-red light wavelength band on the red light wavelength band and cause color mixing, and enable the appearance structural member to better present red.

[0016] In a possible implementation, the light wave reflectivity in the 630 nm to 700 nm wavelength band is greater than or equal to 80%. The high reflectivity makes the Chinese red color effect presented by the appearance structural member better.

[0017] In a possible implementation, the refractive index of the first dielectric layer is 1.4 to 1.9, and the refractive index of the second dielectric layer is 4 to 5. The first dielectric layer is a low refractive index dielectric layer, and the second dielectric layer is a high refractive index dielectric layer, and the difference in their refractive indices is greater than 2.

[0018] In a possible implementation, the extinction coefficient of the first dielectric layer is 0 to 0.002, the thickness is 120 nm to 250 nm, the extinction coefficient of the second dielectric layer is 0.1 to 0.8, and the thickness is less than or equal to 100 nm.

[0019] It is understandable that when a light wave is incident on a film layer, reflections will occur on two surfaces of the film layer that are oppositely arranged along its thickness direction, and the two reflected light waves will interfere with each other. Due to the wave nature of light, the two reflected light waves may interfere constructively (the crests or troughs of the two waves meet, and the intensity of the interfering light increases) or destructively (the amplitudes of the two waves cancel each other out, and the intensity of the interfering light decreases), which depends on their phase relationship. The phase relationship depends on the optical path difference between the two reflected light waves and the wavelength of light, and the optical path difference depends on the thickness of the film layer and the refractive index of light. The color presented by the film layer is the color of the light with the wavelength that interferes constructively. Therefore, by controlling the refractive indices and thicknesses of the first dielectric layer and the second dielectric layer respectively, as well as 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, while the reflectivity of light of other colors is relatively low.

[0020] Furthermore, making the thickness of the second dielectric layer with a relatively high extinction coefficient smaller is beneficial to making the color presented by the film layer brighter, meeting consumers' preference for bright Chinese red color.

[0021] In a possible implementation, at least one dielectric stack layer is a multi-layer dielectric stack layer stacked along the thickness direction of the film layer. Using a multi-layer dielectric stack layer stacked in this way is beneficial to improving the stability of the presented color and ensuring the uniformity of the colors of the appearance structural parts in each batch.

[0022] In a possible implementation, the multi-layer dielectric stack layer is a 3-layer dielectric stack layer. The 3-layer dielectric stack layer not only ensures the stability of the color but also ensures that the color is relatively bright.

[0023] In a possible implementation, the film layer further includes a wear-resistant layer. Along the thickness direction of the film layer, at least one dielectric stack layer is arranged between the wear-resistant layer and the substrate. The hardness of the wear-resistant layer is greater than that of the first dielectric layer and the second dielectric layer. The wear-resistant layer is arranged on the side of the dielectric stack layer away from the substrate along the thickness direction of the film layer, which is beneficial to protecting the dielectric stack layer and improving the wear resistance and corrosion resistance of the film layer.

[0024] 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 high hardness of ta-C makes the film layer have good wear resistance. The small thickness of the wear-resistant layer will not affect the brightness of the color of the film layer.

[0025] In a possible implementation, the film layer further includes a transition layer. Along the thickness direction of the film layer, the transition layer is arranged between at least one dielectric stack layer and the wear-resistant layer, and the refractive index of the transition layer is less than that of the wear-resistant layer. The material of the wear-resistant layer is a high refractive index material, and with a transition layer with a smaller refractive index stacked with it, the two can also be regarded as a dielectric stack layer, which will not affect the color presented by the film layer.

[0026] In a possible implementation, the material of the transition layer is SiyONx, where x and y are positive numbers. The thickness of the transition layer is 120 nm to 250 nm, and the refractive index is 1.4 to 1.9. The refractive index of the wear-resistant layer is 2 to 3. The material of the transition layer is the same as that of the first dielectric layer, which reduces the processing complexity and cost.

[0027] In a possible implementation, the film layer further includes a waterproof layer. In the thickness direction of the film layer, the waterproof layer is stacked with at least one dielectric stack layer, and the waterproof layer is the layer of the film layer that is farthest from the substrate. The waterproof layer enables the film layer to be stain-proof and waterproof, improving the performance of the film layer and the user experience of consumers.

[0028] In a possible implementation, the material of the waterproof layer is Si-O-F or Si-F.

[0029] In a possible implementation, the thickness of the waterproof layer is 1 nm to 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 thinness and lightness of the film layer.

[0030] In a possible implementation, the appearance structural member is a housing or a watch band.

[0031] In the second aspect of the embodiments of the present application, a terminal device is further provided, including the appearance structural member provided in the first aspect of the above embodiments and any possible implementation. The surface of the film layer of the appearance structural member facing away from the substrate constitutes at least a part of the outer surface of the terminal device.

[0032] For the terminal device provided by the present application, the appearance color can be a target color (for example, bright Chinese red, or other colors favored by consumers), meeting the diverse needs of consumers. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the film layer structure of the appearance structural member in a solution;

[0034] Figure 2a It is a schematic diagram of the structure of the back view of the terminal device according to the embodiment of the present application;

[0035] Figure 2b It is a schematic diagram of the exploded structure of the terminal device according to the embodiment of the present application;

[0036] Figure 2c It is a cross-sectional view of the terminal device according to the embodiment of the present application taken along A-A;

[0037] Figure 3a It is a schematic diagram of the structure of the substrate and the dielectric stack layer of the appearance structural member according to the embodiment of the present application;

[0038] Figure 3bReflectance spectrum diagram of the appearance structure member in the embodiment of the present application;

[0039] Figure 4 Schematic diagram of the appearance structure member in the embodiment of the present application;

[0040] Figure 5a Structural schematic of the appearance structure member in the embodiment of the present application Figure 1 , wherein, the dielectric stack layer is 3 layers;

[0041] Figure 5b Structural schematic of the appearance structure member in the embodiment of the present application Figure 1 , wherein, the film layer includes a wear-resistant layer;

[0042] Figure 5c Second structural schematic diagram of the appearance structure member in the embodiment of the present application, wherein, the film layer includes a transition layer;

[0043] Figure 5d Third structural schematic diagram of the appearance structure member in the embodiment of the present application, wherein, the film layer includes a waterproof layer.

[0044] Explanation of reference numerals:

[0045] One solution:

[0046] 100', appearance structure member; 10', substrate; 11', outer surface;

[0047] 20', film layer; 21', TiAlN layer; 22', TiAlON layer; 23', Al2O3 layer;

[0048] Z', thickness direction of the film layer.

[0049] The present application:

[0050] 100, terminal device; 10, screen; 20, housing;

[0051] 21, middle frame; 211, bottom plate; 2111, first surface; 2112, second surface; 212, side frame;

[0052] 22, back cover;

[0053] 30, accommodation space; 31, first installation cavity; 32, second installation cavity;

[0054] 400, appearance structure member;

[0055] 50, substrate; 501, outer surface;

[0056] 60, film layer;

[0057] 61, dielectric stack layer; 611, first dielectric layer; 612, second dielectric layer;

[0058] 62. Wear-resistant layer; 63. Transition layer; 64. Waterproof layer;

[0059] X. Thickness direction of the terminal device; Z. Thickness direction of the film layer;

[0060] O1. Incident light; O2. Reflected light; O3. Reflected light. Detailed implementation manners

[0061] The following specific embodiments illustrate the implementation manners of the present application. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. Although the description of the present application will be introduced in combination with some embodiments, this does not mean that the features of this application are limited to this implementation manner. On the contrary, the purpose of introducing the application in combination with the implementation manner is to cover other alternatives or modifications that may 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 confusing or obscuring the key points of the present application, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0062] It should be noted that in this specification, similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0063] The following explains the terms that may appear in the embodiments of the present application.

[0064] Extinction coefficient: The ability of a material to cause energy loss of light waves during the transmission and reflection of light waves. The larger the extinction coefficient, the stronger the ability of the material to absorb and scatter light.

[0065] Thin-film interference: Assume a beam of light waves is incident on a thin film. Due to the different refractive indices of the thin film and the external environment, the light waves will be reflected at the upper and lower interfaces of the thin film respectively, and the reflected light waves interfere with each other to form new light waves. This phenomenon is called thin-film interference.

[0066] Natural light: Composed of light rays of multiple wavelengths, including a wide spectral range from ultraviolet light to visible light and then to infrared light.

[0067] Phase difference: The difference between the phases of two periodically changing physical quantities.

[0068] Lab value: L represents illuminance (Luminosity), 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 interactive changes of these three values.

[0069] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0070] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0071] In the description of the present application, it should be understood that "electrically connected" in the present application can be understood as the physical contact and electrical conduction of components; it can also be understood as the form of connection between different components in a circuit structure through physical lines such as copper foils or wires of a printed circuit board (PCB) that can transmit electrical signals.

[0072] In the description of the present application, it should be noted that the perpendicularity in the present application is not absolute perpendicularity. The approximate perpendicularity caused by processing errors and assembly errors (for example, the included angle between two structural features is 89.9°) is also within the scope of perpendicularity in the present application. The parallelism in the present application is not absolute parallelism either. The approximate parallelism caused by processing errors and assembly errors (for example, the included angle between two structural features is 0.1°) is also within the scope of parallelism in the present application. The present application does not make specific limitations on this.

[0073] To make the objectives, technical solutions, and advantages of the present application clearer, the following will further describe the embodiments of the present application in detail with reference to the accompanying drawings.

[0074] The appearance structural components of terminal devices (such as mobile phone back covers, watch straps, etc.) usually include a substrate and a colored film layer covering the outer surface of the substrate. However, the medium layer material in the colored film layer that adjusts the display color of the appearance structural component is single, resulting in a relatively wide reflected light band of the colored film layer, which is prone to color mixing and difficult to present a bright target color (for example, bright Chinese red). It can be seen that in the prior art, the appearance structural components of terminal devices are prone to color mixing, difficult to present the target color (for example, bright Chinese red color), and cannot meet the needs of consumers.

[0075] In some solutions, the medium layer in the colored film layer that adjusts the display color of the appearance structural component is set as a stacked composite layer. Adjusting the ratio of each stack in the colored film layer can make the appearance structural component present rich colors and meet the preferences of consumers for various colors. It is found through investigation that Chinese consumers particularly like bright Chinese red, but it is rarely possible to mix a beautiful Chinese red on the appearance structural components of current electronic products.

[0076] Please refer to Figure 1 , Figure 1 which is a schematic diagram of the film layer structure of the appearance structural component in one solution.

[0077] As Figure 1 shown, the appearance structural component 100' includes a substrate 10' and a film layer 20'. The film layer 20' covers the outer surface 11' of the substrate 10'. After natural light irradiates 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. Among them, the band range of the enhanced or weakened light is jointly determined by the thickness of the film layer 20' and the refractive index of light. To make the film layer 20' present red, multiple TiAlN layers 21' and TiAlON layers 22' are repeatedly arranged along the thickness direction Z' of the film layer to adjust the thickness and refractive index of the film layer 20'. However, due to the large number of layers of the TiAlN layer 21' and the TiAlON layer 22', the extinction coefficient of the film layer 20' is high, and the presented color is relatively dark. Moreover, the refractive index difference between the TiAlN layer 21' and the TiAlON layer 22' is small, and the refractive index difference determines the reflection bandwidth. The reflection bandwidth can be understood as the band width of the light with high reflectivity in the reflection spectrum of the film layer 20'. In the film layer 20', the band of the enhanced light is relatively wide, while the band range of the light of Chinese red color is relatively narrow. Therefore, it is difficult for the film layer 20' to present bright Chinese red. In addition, along the thickness direction Z' of the film layer, the outermost stack is the Al2O3 layer 23', and the wear resistance of Al2O3 is poor, so the wear resistance of the film layer 20' is poor.

[0078] There are also some solutions that make the film layer present a specific color by combining anodic oxidation, polishing, and dyeing. However, the cost of this technology is high, and the brightness of the film layer is poor, and the presented color is not bright enough. Moreover, this method is not applicable to the appearance structural parts made of non-metallic materials such as plastics.

[0079] It can be seen that in some solutions, it is difficult for the appearance structural parts of the terminal device to present a bright Chinese red color, which cannot meet the needs of consumers.

[0080] To solve the above technical problems, the embodiments of the present application provide an appearance structural part. By improving the film layer structure of the appearance structural part, it is possible to make the appearance structural part not easily mix colors or even not mix colors at all, better present the target color (for example, bright Chinese red, or other colors favored by consumers), and the film layer has high reliability, meeting the needs of users.

[0081] The embodiments of the present application also provide a terminal device that adopts the appearance structural part provided by the present application. It should be noted that the terminal device includes but is not limited to mobile phones, monitors, laptop computers, tablet computers, wearable devices, vehicle-mounted devices, etc. Hereinafter, the terminal device is a mobile phone and the appearance structural part is the housing of the mobile phone as an example for description.

[0082] Please refer to Figures 2a - 2c , Figure 2a which is a schematic structural diagram of the back view of the terminal device according to the embodiment of the present application; Figure 2b which is an exploded structural diagram of the terminal device according to the embodiment of the present application; Figure 2c which is a cross-sectional view of the terminal device according to the embodiment of the present application taken along A-A.

[0083] As Figures 2a - 2bAs shown, the terminal device 100 includes a housing 20 and a screen 10. Among them, the screen 10 is fixedly installed on the housing 20 and is used to display images. Its specific type is not limited, and it 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 diodes (QLED) screen, etc. The housing 20 forms a receiving space 30 for accommodating the components of the terminal device 100 and serves to protect the terminal device 100 and support the screen 10.

[0084] Those skilled in the art can understand that the specific structure of the housing 20 is not limited. For example, Figures 2b - 2c As shown, in a possible implementation manner, the housing 20 includes a middle frame 21 and a rear cover 22. The middle frame 21 includes a bottom plate 211 and a frame 212 that is disposed around and connected to the outer peripheral side of the bottom plate 211. As Figure 2c shown, the screen 10 and the rear cover 22 are disposed 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 includes a first surface 2111 and a second surface 2112 that are disposed opposite to each other along the thickness direction X of the terminal device. The first surface 2111, the frame 212, and the screen 10 jointly enclose and form a first installation cavity 31, and the second surface 2112, the frame 212, and the rear cover 22 jointly enclose and form a second installation cavity 32. The first installation cavity 31 and the second installation cavity 32 form the receiving space 30 described above. The first installation cavity 31 and the second installation cavity 32 can be used to install components such as a battery, a circuit board, a camera module, a speaker module, and a chip.

[0085] For example, Figures 2a - 2c As shown, the frame 212 is a structure that surrounds the outer periphery of the terminal device 100. In a possible implementation manner, the frame 212 can extend around the outer 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.

[0086] It should be noted that the bottom plate 211 and the frame 212 can be of an integral structure or a split structure, and this application does not limit this. When the bottom plate 211 and the frame 212 are of an integral structure, the two can be assembled by permanent connection methods such as welding and integral molding. When the bottom plate 211 and the frame 212 are of a separated structure, the bottom plate 211 and the frame 212 are two different components of the housing 20, and the two can be assembled together by means such as snap connection and buckling, and can be separated when disassembly is required.

[0087] It should be noted that the material of the middle frame 21 is not limited. It 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 this application does not limit this.

[0088] As Figures 2a - 2c shown, the rear cover 22 is a structure disposed opposite to the screen 10 on the terminal device 100, and is connected to the middle frame 21, and is used to enclose the components of the terminal device 100 inside the terminal device 100, and at the same time can also prevent dust, prevent collision, prevent hardware scratches, etc. The rear cover 22 can be made of a metal material, such as magnesium alloy, stainless steel, etc., or can be made of a non-metal material, such as glass, plastic, etc., and this application does not limit this.

[0089] It should be noted that the middle frame 21 and the rear cover 22 can be of an integral structure or a split structure, and this application does not limit this. In a possible implementation manner, the middle frame 21 and the rear cover 22 are of a split structure. The middle frame 21 and the rear cover 22 are two different components of the housing 20, and the two can be assembled together by means such as snap connection and buckling, and can be separated when disassembly is required. In an alternative implementation manner, the middle frame 21 and the rear cover 22 are of an integral structure. In another alternative implementation manner, the housing 20 of the terminal device 100 may not include a separately provided rear cover 22, but use the bottom plate 211 of the middle frame 21 as the rear cover 22, and this application does not limit this.

[0090] Those skilled in the art can understand that in the terminal device 100 as Figures 2a - 2b shown, the housing 20, as an appearance structure part 400 (or it can be understood that the appearance structure part 400 mentioned below can be at least part of the structure of the housing 20. For example, it can be the middle frame 21 of the housing 20, or the rear cover 22 of the housing 20, etc.), a film layer 60 is covered on the outer surface 501 of the matrix 50 (see Figure 3a), and the surface 501 of the film layer 60 facing away from the substrate 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.). The outer surface can be understood as the appearance surface of the terminal device 100. After light shines on the film layer 60, due to thin-film interference, the film layer will present a specific color, that is, the outer surface of the terminal device 100 can have a specific color, meeting the consumer's requirements for the appearance of the terminal device 100. It should be noted that the surface of the film layer 60 facing away from the substrate 50 in the appearance structure member 400 can constitute all of the outer surface of the terminal device 100, or only constitute a part of the outer surface of the terminal device 100. This application does not limit this.

[0091] The following will describe the specific structure of the appearance structure member 400 with the film layer 60 covering the outer surface 501 in conjunction with the accompanying drawings. It should be noted that in other terminal devices, the appearance structure member can also adopt the structure in this application. The types of the terminal device and its appearance structure member are not limited. For example, it can be a tablet computer and its shell, a smart watch and its strap, a smart glasses and its frame, temple arms, etc. This application does not limit this. Those skilled in the art can understand that the appearance structure member 400 can be understood as the structure member at least partially located outside the terminal device 100, that is, at least part of the outer surface of the appearance structure member 400 is exposed outside the terminal device 100, constituting the appearance surface of the terminal device 100.

[0092] Please refer to Figures 3a - 3b , Figure 3a which is a schematic structural diagram of the substrate and the dielectric stack layer of the first appearance structure member of the embodiment of the present application; Figure 3b which is a reflection spectrogram of the first appearance structure member of the embodiment of the present application.

[0093] It should be noted that Figure 3b the shown reflection spectrogram reflects the law of the reflectivity of the film layer 60 changing with the wavelength of the incident light. The curve obtained with the incident wavelength as the abscissa and the reflectivity as the ordinate is the reflection spectral characteristic curve of the film layer 60.

[0094] As Figure 3aAs shown in the figure, an embodiment of the present application provides an appearance structural member 400, which includes a substrate 50 and a film layer 60. The substrate 50 has an outer surface 501, and the film layer 60 is disposed on the outer surface 501 of the substrate 50. It should be noted that the material of the substrate 50 is not limited and can be an alloy (such as titanium alloy, magnesium alloy, aluminum alloy, etc.), plastic, etc. In a possible implementation manner, the material of the substrate 50 is TC4 titanium alloy. In an alternative implementation manner, the material of the substrate 50 is aluminum alloy. The film layer 60 is configured as a color display structure. Among them, the color display structure can be understood as a structure that enables the film layer 60 to present colors (such as red, green, purple, etc.). From the appearance, the film layer 60 displays colors. For example, as described below by the principle of thin film interference, visible light incident on the film layer 60 can be reflected, and the wavelength band of the reflected light includes a target wavelength band corresponding to the target color, thereby enabling the film layer to present the target color.

[0095] The film layer 60 includes a dielectric stack layer 61. The number of layers of the dielectric stack layer 61 is not limited and can be 1 layer, 2 layers, 3 layers, etc. The present application does not make any limitations in this regard. Each layer of the dielectric stack layer 61 includes a first dielectric layer 611 and a second dielectric layer 612 stacked 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 that of the first dielectric layer.

[0096] For the appearance structural member 400 provided by the present application, 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, visible light incident on the film layer 60 can be reflected, and the wavelength band of the reflected light includes a target wavelength band corresponding to the target color, and the light wave reflectivity of the target wavelength band is relatively large, which can better achieve the target color. Among them, 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 60 from the outside.

[0097] Furthermore, the difference in refractive index between the respective stacked layers of the film layer 60 determines the reflection bandwidth. The reflection bandwidth can be understood as the bandwidth of the wavelength band of 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 made to match the wavelength band range corresponding to the target color, so that the film layer is not prone to color mixing or even does not undergo color mixing, ensuring that the film layer can better present the target color and the purity of the target color is high.

[0098] Therefore, for the appearance structural member 400 provided by the present application, 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 film layer 60 is not prone to color mixing or even does not undergo color mixing, and can better present the target color (such as Chinese red color, or other colors favored by consumers), meeting the needs of consumers.

[0099] It should be noted that the difference between the refractive index of the second dielectric layer 612 and the refractive index of the first dielectric layer 611 is not limited, and the target color that the appearance structure 400 needs to present is not limited. For example, Figure 3a as shown, in a possible implementation, the difference between the refractive index of the second dielectric layer 612 and the refractive index of the first dielectric layer 611 is greater than or equal to 2. For example, it can be 2, 2.2, 2.5, 2.9, 3.2, etc., and the present application does not limit this. Combining Figure 3b it is understood that each dielectric stack layer 61 is configured such that after visible light is incident on the film layer 60, the wavelength band of the reflected light includes 630 nm to 700 nm (wherein, in one example, the wavelength band of the reflected light is 620 nm - 760 nm; in another example, the wavelength band of the reflected light is 620 nm - 700 nm; in yet another example, the wavelength band of the reflected light is 630 nm - 700 nm, and the present application does not specifically limit this), and the light wave reflectivity in the 630 nm - 700 nm wavelength band is greater than or equal to 60%. It should be noted that the reflectivity in the 630 nm - 700 nm wavelength band is not limited. For example, it can be 60%, 70%, 80%, 90%, 95%, 100%, etc., and the present application does not limit this. 630 nm - 700 nm is the red light wavelength band. It can also be understood that after visible light is incident on the film layer 60, the reflected light is red light. The light waves in the 420 nm - 580 nm wavelength band are absorbed by the film layer 60. It can also be understood that the light wave reflectivity in the 420 nm - 580 nm wavelength band is less than 20% (or less than 15%, or less than 10%, or less than 5%, etc.), for example, 20%, 15%, 10%, 5%, 3%, etc., and the present application does not limit this).

[0100] For the appearance structure 400 provided by the present application, each dielectric stack layer 61 includes a first dielectric layer 611 and a second dielectric layer 612 that are stacked and have a relatively large difference in refractive index (greater than or equal to 2). The visible light incident on the film layer 60 is reflected, and the wavelength band of the reflected light includes 630 nm to 700 nm, and the light wave reflectivity in the 630 nm - 700 nm wavelength band is greater than or equal to 60%. 630 nm - 700 nm is in the red light wavelength band. The light in the non - red light wavelength band is absorbed. The film layer 60 has a strong ability to reflect red light and a weak ability to reflect visible light in the non - red light wavelength band, so that the film layer 60 seen by consumers appears red.

[0101] Furthermore, for example, Figure 3bIn the reflection spectrum shown, the reflection bandwidth is about 70nm (630nm-700nm band, high light reflectivity, close to 100%). Those skilled in the art can understand that the band range corresponding to the Chinese red color in red light is relatively narrow, and the difference between the refractive index of the first dielectric layer 611 and the refractive index of the second dielectric layer 612 is greater than or equal to 2, which can match the reflection bandwidth with the band range of the Chinese red light, thereby preventing the film layer 60 from mixing colors, ensuring that the film layer 60 can present the Chinese red color, and the Chinese red color purity is high.

[0102] Therefore, the appearance structural component 400 provided in the present application can present the Chinese red color to meet the needs of consumers.

[0103] like Figure 3b As shown, in a possible implementation, the reflectivity of the light wave in the 630nm-700nm band 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 630nm-700nm band is close to 100%. The light in the 630nm-700nm band is Chinese red, which can also be understood as the high reflectivity of Chinese red light.

[0104] See also Figure 4 , Figure 4 This is a schematic diagram of the appearance structural parts of an embodiment of the present application.

[0105] It should be noted that Figure 4 To facilitate the explanation of the principle of thin film interference, take the incident light O1 that is incident on the film layer 60 parallel to the thickness direction Z of the film layer as an example, and the incident light O1 and the two columns of reflected light (reflected light O2 and reflected light O3) generated on the upper and lower surfaces of the film layer 60 are drawn with shifts 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 by it overlap).

[0106] like Figure 4As shown, 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 hits the film layer 60, reflections occur on two surfaces of the film layer 60 arranged in opposite directions along its thickness direction Z, generating the reflected light O2 and the reflected light O3, and the two reflected light beams will 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 may cause the interference light to be enhanced (when the wave crest of the reflected light O2 coincides with the wave crest of the reflected light O3, that is, the phase difference is an integer multiple of 2π), or cause the interference light to be weakened (when the wave crest of the reflected light O2 is opposite to the wave trough of the reflected light O3, 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, 2πΔ÷λ = φ, where λ is the wavelength, Δ is the optical path difference, and φ 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 distances traveled by the two light beams. As Figure 4 shown, when the incident light hits the film layer 60 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 indices of both the first dielectric layer 611 and the second dielectric layer 612, and d is the total thickness of the film layer 60. Therefore, by adjusting the refractive indices and thicknesses of the first dielectric layer 611 and the second dielectric layer 612, the effective refractive index and thickness of the film layer 60 can be adjusted, thereby enhancing the interference light of Chinese red color and weakening the interference light of other colors.

[0107] In a possible implementation, the refractive index of the first dielectric layer 611 is 1.4 to 1.9, for example, 1.4, 1.5, 1.6, 1.7, 1.9, etc., and this application does not limit this. The refractive index of the second dielectric layer 612 is 4 to 5, for example, 4, 4.2, 4.6, 4.8, 5, etc., and this application does not limit this. In one 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., and this application does not limit this.

[0108] In a possible implementation, the thickness of the first dielectric layer 611 is 120 nm to 250 nm, such as 120 nm, 140 nm, 160 nm, 200 nm, 250 nm, etc., and the present application does not limit this. The thickness of the second dielectric layer 612 is less than or equal to 100 nm, such as 100 nm, 80 nm, 60 nm, 40 nm, etc., and the present application does not limit this. It should be noted that in other alternative implementations, the thickness of the first dielectric layer 611 can also be less than 120 nm, for example, 110 nm, 105 nm, 100 nm, etc., or greater than 250 nm, for example, 260 nm, 270 nm, 280 nm, etc., and the thickness of the second dielectric layer 612 can also be greater than 100 nm, for example, 110 nm, 120 nm, 130 nm, etc., and the present application does not limit this.

[0109] It should be noted that the materials of the first dielectric layer 611 and the second dielectric layer 612 are 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 Figure 3a shown, in a possible implementation, the material of the first dielectric layer 611 is SiyONx, where x and y are positive numbers, and the values of x and y are not limited. For example, when x is 1 and y is 1, it is SiON; when x is 1 and y is 2, it is SiON2; or when x is 3 and y is 4, it is Si3ON4, etc. The present application does not limit this. The material of the second dielectric layer 612 is amorphous silicon (a-Si), also known as non-crystalline 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 the two is good, it is 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 beneficial to improving the wear resistance of the overall film layer 60.

[0110] It can be understood that by adjusting the ratio of y to x in SiyONx, the thermal expansion coefficient of the first dielectric layer 611 can be adjusted to match substrates 50 of different materials.

[0111] Those skilled in the art can understand that the structure of the film layer 60 in the present application is not only applicable to making the appearance structural member 400 present a bright Chinese red color, but also other different colors can be presented by adjusting the structure of the film layer 60, and the present application does not limit this. That is to say, the difference in the refractive index between the second dielectric layer 612 and the first dielectric layer 611 in the dielectric stack layer 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 not limited to the scenarios described above.

[0112] As Figure 3aAs shown, in a possible implementation, in the film layer 60 of the appearance structural member 400, the material of the first dielectric layer 611 is SiyONx, where y and x are positive numbers. The refractive index of SiyONx can be adjusted by adjusting the ratio between x and y, and by matching with the second dielectric layer 612 with a high refractive index, the film layer 60 can present different colors. For example, Chinese red, blue, purple, etc. 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, different colors can be presented by adjusting the element ratio of the first dielectric layer 611, and the method is simple and can meet the differentiated needs of consumers.

[0113] As Figure 3a As shown, in a possible implementation, for the substrate 50 made of TC4 titanium alloy, the first dielectric layer 611 is covered on its outer surface 501, and the material of the first dielectric layer 611 is 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 in the thermal expansion coefficients between the material of the layer covering the outer surface 501 of the substrate 50 in the film layer 60 and the substrate 50. If the difference in thermal expansion coefficients is small, the bonding between the film layer 60 and the substrate 50 is firm. The difference in the thermal expansion coefficients between SiON and TC4 titanium alloy is less than 10%. In other alternative embodiments, the materials of the first dielectric layer 611 and the second dielectric layer 612 can also be other materials, and this application does not limit this. Further, the hardness of SiON is 1500HV, and the relatively high hardness is beneficial to improving the wear resistance of the film layer 60.

[0114] Those skilled in the art can understand that the extinction coefficient of the dielectric layer is also related to the material of the dielectric layer. By using the silicon-based first dielectric layer 611 and the second dielectric layer 612, silicon has a certain light absorption ability, which can adjust the brightness of the color presented by the film layer 60. In one possible implementation, the extinction coefficient of the first dielectric layer 611 is 0 to 0.002. For example, 0, 0.001, 0.0014, 0.0016, 0.002, etc. This application does not limit this. 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, etc. This application does not limit this. The extinction coefficient of the second dielectric layer 612 is 0.1 to 0.8. For example, 0.1, 0.2, 0.5, 0.7, 0.8, etc. This application does not limit this. 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, etc., or greater than 0.8. For example, 0.85, 0.88, 0.9, etc. This application does not limit this. In an 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 both relatively small, which is beneficial to reducing the overall extinction coefficient of the film layer 60, and thus making the presented color brighter. Further, making the thickness of the second dielectric layer 612 with a relatively higher extinction coefficient smaller is beneficial to making the color presented by the film layer 60 brighter.

[0115] Please refer to Figures 5a - 5d , Figure 5a is a schematic structural diagram of the appearance structural member of the embodiment of the present application Figure 1 , where the dielectric stack layer is 3 layers; Figure 5b is a schematic structural diagram of the appearance structural member of the embodiment of the present application Figure 1 , where the film layer includes an abrasion-resistant layer; Figure 5c is the second schematic structural diagram of the appearance structural member of the embodiment of the present application, where the film layer includes a transition layer; Figure 5d is the third schematic structural diagram of the appearance structural member of the embodiment of the present application, where the film layer includes a waterproof layer.

[0116] Such as Figure 5aAs shown, in a possible implementation, the film layer 60 includes three dielectric stack layers 61 stacked along the thickness direction Z of the film layer. It can also be understood that three first dielectric layers 611 and three second dielectric layers 612 are sequentially stacked along the thickness direction Z of the film layer. The three dielectric stack layers 61 are beneficial to improving the color stability of the film layer 60, ensuring the color uniformity of the appearance structural parts 400 in each batch, reducing color difference, and at the same time ensuring that the number of layers of the dielectric stack layer 61 is not too large, the extinction coefficient of the film layer 60 is appropriate, and the presented color is relatively bright. In other alternative implementations, the number of layers of the dielectric stack layer 61 can also be more than three, such as four, five, etc., or less than three, such as one, two, etc., and the present application does not limit this.

[0117] It should be noted that the thicknesses of the first dielectric layers 611 of each layer can be the same or different. Similarly, the thicknesses of the second dielectric layers 612 of each layer can be the same or different. As Figure 5a shown, in a possible implementation, along the thickness direction Z of the film layer from bottom to top, the thicknesses of the first dielectric layers 611 of each layer gradually increase. For example, they are 140nm, 140nm, and 160nm in sequence. The thicknesses of the second dielectric layers 612 of each layer remain unchanged first and then increase. For example, they are 42nm, 42nm, and 45nm in sequence. In other alternative implementations, along the thickness direction Z of the film layer, there can also be other feasible combinations of the thicknesses of the first dielectric layers 611 of each layer and the second dielectric layers 612 of each layer, and the present application does not limit this.

[0118] As Figure 5a shown, in combination with Figure 3b it can be understood that by using the film layer 60 with three dielectric stack layers 61, in one example, the Lab values of the color presented by the film layer 60 are L = 38.0, a = 48.6, b = 37.6. In another example, the Lab values of the color presented by the film layer 60 are 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.

[0119] As Figure 5bAs shown, in a possible implementation, the film layer 60 further includes a wear-resistant layer 62. In the thickness direction Z of the film layer, each dielectric stack layer 61 is disposed between the wear-resistant layer 62 and the substrate 50. It can also be understood that the wear-resistant layer 62 is disposed on the side of the multilayer dielectric stack layer 61 away from the substrate 50 along the thickness direction Z of the film layer to protect the dielectric stack layer 61 and improve the wear resistance and corrosion resistance of the film layer 60. It can be understood that the hardness of the wear-resistant layer 62 is greater than the hardness of the first dielectric layer 611 and the second dielectric layer 612. The specific hardness value is not limited and can be 2000HV, 2500HV, 3000HV, etc. This application does not limit this. It should be noted that in an alternative implementation, the film layer 60 may not be provided with the wear-resistant layer 62, and this application does not limit this.

[0120] It should be noted that the material of the wear-resistant layer 62 is not limited and can be wear-resistant materials such as ceramic materials and polymer composite materials. In a possible implementation, the material of the wear-resistant layer 62 is ta-C, with a hardness of 3000HV, such that the vibration wear resistance test of the film layer 60 is greater than 1 hour and the steel wool friction test is greater than 4000 times, and the wear resistance of the film layer 60 is good. The sp 3 bond content of ta-C is 40% - 60%, and it has good temperature resistance performance, which is beneficial to improving the user experience. The refractive index of ta-C is 2 - 3, for example, 2, 2.1, 2.5, 2.7, 2.9, 3, etc. This application does not limit this, and the extinction coefficient is 0.1 - 0.4, for example, 0.1, 0.15, 0.3, 0.38, 0.4, etc. This application does not limit this. In an example, the refractive index of the wear-resistant layer 62 is 2.6 and the extinction coefficient is 0.36. In other alternative implementations, the refractive index of the wear-resistant layer 62 may also 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 wear-resistant layer 62 may 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. This application does not limit this.

[0121] As Figure 5b shown, in a possible implementation, the thickness of the wear-resistant layer 62 is less than or equal to 15nm, for example, 15nm, 12nm, 10nm, 8nm, etc. This application does not limit this. In a possible implementation, the thickness of the wear-resistant layer 62 is 10nm. Those skilled in the art can understand that on the one hand, the small thickness of the wear-resistant layer 62 is beneficial to making the total thickness of the film layer 60 small, making the appearance structure member 400 thin and light. On the other hand, the small thickness of the wear-resistant layer 62 does not affect the brightness of the color presented by the film layer 60.

[0122] As Figure 5cAs shown, in a possible implementation, the film layer 60 further includes a transition layer 63. In the thickness direction Z of the film layer, the transition layer 63 is disposed between the multi-layer dielectric stack layer 61 and the wear-resistant layer 62. A transition layer 63 is provided between the wear-resistant layer 62 and the dielectric stack layer 61 closest to the wear-resistant layer 62, such that the refractive index of the transition layer 63 is less than that of the wear-resistant layer 62, which is conducive to ensuring a large refractive index difference between the stacked layers of the film layer 60, and thus ensuring the reflection bandwidth of the reflection spectrum diagram of the film layer 60. It can also be understood that the transition layer 63 and the wear-resistant layer 62 together form a dielectric stack layer 61. In an alternative implementation, the film layer 60 may not be provided with a transition layer 63, and the present application does not limit this.

[0123] The material and refractive index of the transition layer 63 are not limited, as long as there is a certain difference between the wear-resistant layer 62 and the second dielectric layer 612. In a possible implementation, the material of the transition layer 63 is SiyONx, where 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 cost.

[0124] The refractive index of the transition layer 63 is 1.4 to 1.9. For example, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, etc., and the present application does not limit this. 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 may also be less than 1.4, such as 1.3, 1.2, 1.1, etc., or greater than 1.9, such as 2, 2.1, 2.2, etc., and the present application does not limit this. The thickness of the transition layer 63 is 120 nm to 250 nm, such as 120 nm, 140 nm, 160 nm, 200 nm, 230 nm, 250 nm, etc., and the present application does not limit this. In one example, the thickness of the transition layer 63 is 240 nm. In other alternative implementations, the thickness of the transition layer 63 may also be less than 120 nm, such as 115 nm, 110 nm, 105 nm, etc., or greater than 250 nm, such as 260 nm, 270 nm, 280 nm, etc., and the present application does not limit this. As Figure 5dAs shown, in a 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 outermost layer away from the substrate 50. 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 disposed between the waterproof layer 64 and the substrate 50. The waterproof layer 64 can play a role in anti-fouling and waterproofing, thus protecting other laminated layers and improving the performance of the film layer 60 and the user experience of consumers. It should be noted that the material of the waterproof layer 64 is not limited. In a possible implementation, the material of the waterproof layer 64 is Si-F. The low surface free energy of Si-F makes the water contact angle of the side surface of the waterproof layer 64 away from the substrate 50 along the thickness direction Z of the film layer greater than 120°. The larger the water contact angle, the better the hydrophobicity of the surface. Therefore, the waterproof layer 64 can make the film layer 60 have a hydrophobic and anti-fingerprint effect. In an alternative solution, the material of the waterproof layer 64 is Si-O-F, and the present application does not limit this. It should be noted that in an alternative implementation, the waterproof layer 64 may not be provided, and the present application does not limit this.

[0125] In a possible implementation, the thickness range of the waterproof layer 64 is 1 - 2 nm. For example, 1 nm, 1.2 nm, 1.3 nm, 1.5 nm, 2 nm, etc. The present application does not limit this. The thickness of the waterproof layer 64 is very small and the color is close to transparent. While enabling the film layer 60 to have a waterproof function, it does not affect the color presented by the film layer 60 and is beneficial to the thinness and lightness of the film layer 60. In an alternative implementation, the film layer 60 may also not be provided with the waterproof layer 64, and the present application does not limit this.

[0126] It should be noted that the materials constituting the film layer 60 are all insulating materials, making the resistivity of the film layer 60 greater than 1 GΩ, such as 2 GΩ, 3 GΩ, 4 GΩ, etc. The present application does not limit this. In an example, the resistivity of the film layer 60 is greater than 4 GΩ. The film layer 60 is an insulator and will not interfere with the signal transceiver of the mobile terminal.

[0127] 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 formed by magnetron sputtering deposition, the wear-resistant layer 62 is formed by multi-arc ion plating deposition, and the waterproof layer 64 is formed by coating. The combination of magnetron sputtering and multi-arc ion plating has a lower cost, is suitable for mass production, and the connection between each layer is firm, and the reliability of the film layer 60 is good. The film layer 60 can also be prepared by other process methods, and the present application does not limit this.

[0128] Obviously, those skilled in the art can make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application is also intended to cover these changes and modifications.

Claims

1. An appearance structural component for a terminal device, characterized in that: The appearance structural parts include: a substrate having an outer surface; A film layer, the film layer is coated on the outer surface of the substrate and is configured as a color development structure; Wherein, the film layer includes at least one dielectric stack layer, each dielectric stack layer in the at least one dielectric stack layer includes a first dielectric layer and a second dielectric layer stacked along its thickness direction and made of different materials, and the refractive index of the second dielectric layer is different from the refractive index of the first dielectric layer.

2. The appearance structural member according to claim 1, characterized in that: The material of the first dielectric layer is SiyONx, where x and y are positive numbers, and the material of the second dielectric layer is amorphous silicon.

3. The appearance structural member according to claim 2, characterized in that: The material of the substrate is alloy material or plastic, and the first dielectric layer is a layer in the corresponding dielectric stacking layer close to the substrate along the thickness direction thereof; When the material of the substrate is titanium alloy or aluminum alloy, in the material SiyONx of the first dielectric layer, the value of y is 1, and the value of x is 1.

4. The appearance structural member according to any one of claims 1 to 3, characterized in that: 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 as follows: after visible light is irradiated onto the film layer, the wavelength band of the reflected light includes 630nm to 700nm, and the reflectivity of the light wave in the wavelength band of 630nm to 700nm is greater than or equal to 60%.

5. The appearance structural member according to claim 4, characterized in that: After the visible light is irradiated to the film layer, the light waves in the wavelength range of 420nm to 580nm are absorbed by the film layer.

6. The appearance structural member according to claim 4, characterized in that: The reflectivity of light waves in the 630nm to 700nm band is greater than or equal to 80%.

7. The appearance structural member according to any one of claims 1 to 3, characterized in that: The refractive index of the first dielectric layer is 1.4-1.9, and the refractive index of the second dielectric layer is 4-5.

8. The appearance structural member according to claim 7, characterized in that: The extinction coefficient of the first dielectric layer is 0 to 0.002, and the thickness is 120 nm to 250 nm; The extinction coefficient of the second dielectric layer is 0.1-0.8, and the thickness is less than or equal to 100 nm.

9. The appearance structural member according to any one of claims 1 to 3, characterized in that: The at least one dielectric stack layer is: a plurality of dielectric stack layers stacked along the thickness direction of the film layer.

10. The appearance structural member according to claim 9, characterized in that: The multi-layer dielectric stack is a three-layer dielectric stack.

11. The appearance structural member according to any one of claims 1 to 3, characterized in that: The film layer further comprises a wear-resistant layer, and in the thickness direction of the film layer, the at least one medium stacking layer is arranged between the wear-resistant layer and the substrate; The hardness of the wear-resistant layer is greater than that of the first dielectric layer and the second dielectric layer.

12. The appearance structural member according to claim 11, characterized in that: 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 structural member according to claim 11, characterized in that: The film layer further includes a transition layer. In the thickness direction of the film layer, the transition layer is arranged between the at least one dielectric stacking layer and the wear-resistant layer. The refractive index of the transition layer is smaller than the refractive index of the wear-resistant layer.

14. The appearance structural member according to claim 13, characterized in that: The material of the transition layer is SiyONx, x and y are positive numbers, the thickness of the transition layer is 120nm to 250nm, and the refractive index is 1.4 to 1.9; The refractive index of the wear-resistant layer is 2-3.

15. The appearance structural member according to any one of claims 1 to 3, characterized in that: The membrane layer further comprises a waterproof layer. In the thickness direction of the membrane layer, the waterproof layer is stacked with the at least one medium stacking layer, and the waterproof layer is: a layer of the membrane layer farthest from the substrate.

16. The appearance structural member according to claim 15, characterized in that: The material of the waterproof layer is Si-OF or Si-F.

17. The appearance structural member according to claim 16, characterized in that: The thickness of the waterproof layer is 1nm to 2nm.

18. The appearance structural member according to any one of claims 1 to 3, characterized in that: The appearance structural part is a shell or a watch strap.

19. A terminal device, characterized in that: It comprises the appearance structural part according to any one of claims 1 to 18, wherein the surface of the film layer in the appearance structural part facing away from the substrate constitutes: at least a part of the outer surface of the terminal device.

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