A protective film for electronic devices

Abstract

This invention provides a protective film for electronic devices, including a light-transmitting area for displaying the screen content of the electronic device and an edge area located at at least part of the edge of the light-transmitting area. The light transmittance of the light-transmitting area is not less than 90%, and the difference in light transmittance between the light-transmitting area and the edge area does not exceed 15%. By controlling the light transmittance of the edge of the electronic device protective film to eliminate black borders, it effectively avoids obvious visual dividing lines caused by excessive differences in light transmittance, making the entire electronic device protective film look more uniform and natural. Whether viewed from the front or the side, there will be no abrupt black borders or color differences, enhancing the overall aesthetics of the mobile phone screen.

Description

Technical Field

[0001] This utility model relates to the field of protective films, and more specifically, to a protective film for electronic devices. Background Technology

[0002] In today's world of ubiquitous electronic products, screen protectors, as crucial protective accessories for screens, enjoy enormous market demand. However, due to limitations in multiple production processes such as cutting, polishing, and coating, existing screen protectors are prone to imperfections at the edges, such as scratches, chips, and uneven coloring. Adding a "black border" to the edges of screen protectors can cleverly conceal these imperfections, enhancing the product's appearance. This black border refers to the area formed by applying black ink in a specific shape to the tempered glass edge using a screen printing process to conceal edge imperfections. Compared to high-precision edge processing technologies that require extremely high manufacturing precision, the black border setting process is simpler, reducing the technical requirements for equipment and operators, and significantly lowering production difficulty and costs. However, the black border design of screen protectors has several drawbacks. It not only obstructs the edge display area of ​​the screen, affecting user viewing, but also contradicts the trend towards ultra-narrow bezel designs in mobile phones and other devices. Therefore, a screen protector solution that can address this issue is needed. Utility Model Content

[0003] In view of the problems existing in the prior art, this utility model provides a protective film for electronic devices. The specific solution is as follows:

[0004] An electronic device protective film includes a light-transmitting area for displaying content on an electronic device screen and an edge area located at at least a portion of the edge of the light-transmitting area, wherein the light transmittance of the light-transmitting area is not less than 90%, and the difference in light transmittance between the light-transmitting area and the edge area does not exceed 15%.

[0005] In some specific embodiments, the edge region and the light-transmitting region are the same in at least one of transmittance, reflectance, and refractive index.

[0006] In some specific embodiments, the electronic device protective film includes a planar portion and a curved portion, the light-transmitting area includes at least the planar portion, and the edge area is disposed within the curved portion.

[0007] In some specific embodiments, the light-transmitting area is provided with an adhesive layer for connecting an external screen, and the adhesive layer extends at least to the edge area.

[0008] In some specific embodiments, the edges of the adhesive layer are provided with a sealing structure to seal the edges of the adhesive layer.

[0009] In some specific embodiments, the sealing structure includes an epoxy resin adhesive layer structure.

[0010] In some specific embodiments, the thickness of the electronic device protective film ranges from 0.15 to 0.25 mm.

[0011] In some specific embodiments, the surface roughness of the edge region on the thickness side is less than Ra0.5μm.

[0012] In some specific embodiments, under 60° gloss measurement conditions, the gloss value of the edge region on the thickness side is not less than 60 GU.

[0013] In some specific embodiments, the adhesive layer comprises a multilayer adhesive layer structure, and the middle adhesive layer structure is a silicone gel layer.

[0014] Beneficial effects: This utility model provides a protective film for electronic devices. By controlling the light transmittance of the edge of the protective film, black edges are removed, effectively avoiding obvious visual dividing lines caused by excessive differences in light transmittance. This makes the entire protective film for electronic devices look more uniform and natural. Whether viewed from the front or the side, there will be no abrupt black edges or color differences, enhancing the overall aesthetics of the mobile phone screen.

[0015] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the electronic device protective film in Example 1;

[0018] Figure 2 This is a schematic diagram of the area division of the protective film for electronic devices in Example 1;

[0019] Figure 3 This is a schematic diagram of the curved screen protective film in Example 1;

[0020] Figure 4 This is a schematic diagram of the flat screen protective film of Example 1;

[0021] Figure 5 This is a schematic diagram of the adhesive layer structure in Example 1;

[0022] Figure 6 Explosion of the protective film structure for electronic devices in Example 2 Figure 1 ;

[0023] Figure 7 Explosion of the protective film structure for electronic devices in Example 2 Figure 2 ;

[0024] Figure 8 Explosion of the protective film structure for electronic devices in Example 2 Figure 3 ;

[0025] Figure 9 This is an enlarged cross-sectional view of the protective film for electronic devices in Example 2;

[0026] Figure 10 This is an exploded three-dimensional view of the protective film for electronic devices in Example 3;

[0027] Figure 11 This is a first schematic diagram of the adhesive layer structure of the electronic device protective film in Example 3;

[0028] Figure 12 This is an exploded view of the adhesive layer structure of the electronic device protective film in Example 3;

[0029] Figure 13 This is a second schematic diagram of the adhesive layer structure of the electronic device protective film in Example 3;

[0030] Figure 14 This is an exploded view of the overall structure of the curved screen protective film in Example 4;

[0031] Figure 15 This is a cross-sectional schematic diagram of the curved screen protective film of Example 4;

[0032] Figure 16 This is another cross-sectional schematic diagram of the curved screen protective film of Example 4;

[0033] Figure 17 This is a partial cross-sectional schematic diagram of the curved screen protective film of Example 4.

[0034] Reference numerals: 41-Edge area; 42-Transparent area; 43-Adhesive layer; 44-Glass base layer; 45-Electroplated coating; 431-Acrylic adhesive layer; 432-Silicone gel layer; 433-Ventilation adhesive layer; 434-Sealing structure; 21-Protective film body; 22-Adhesive layer; 2201-First adhesive surface; 2202-Second adhesive surface; 221-First adhesive layer; 222-First base layer; 223-Second silicone gel layer; 224-Second base layer; 225-Second adhesive layer ; 23-Release film; 31-Glass layer; 32-Adhesive layer; 321-First adhesive layer; 322-Intermediate buffer layer; 323-Second adhesive layer; 324-First substrate layer; 325-Second substrate layer; 326-Protective layer; 11-Transparent substrate; 111-Bent section; 112-Flat section; 12-Elastic adhesive layer; 13-Buffer notch; 14-First adhesive layer; 15-Second adhesive layer; 16-Sealing layer; 17-Optical transparent transition layer; 18-Functional coating. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0036] Example 1

[0037] This embodiment proposes a protective film for electronic devices. Please refer to [reference needed]. Figures 1 to 5 The black edges are removed by controlling the light transmittance at the edges of the electronic device protective film. A schematic diagram of the overall structure of the electronic device protective film is shown in the attached instruction manual. Figure 1 As shown, the specific solution is as follows:

[0038] A protective film for electronic devices includes a light-transmitting area 42 for displaying content on the screen of the electronic device and an edge area 41 located at least part of the edge of the light-transmitting area. The light-transmitting area 42 has a light transmittance of not less than 90%, and the difference in light transmittance between the light-transmitting area 42 and the edge area 41 does not exceed 15%. The edge area does not necessarily completely surround the light-transmitting area; it may only be located at part of the edge of the light-transmitting area. For protective films for electronic devices such as mobile phones, the edge area can be located on both sides of the light-transmitting area. The electronic device protective film is divided into two main areas: the edge area 41 and the light-transmitting area 42, the extent of which is shown in the attached figure. Figure 2As shown, edge area 41 is located at the edge of the electronic device protective film. Light-transmitting area 42 is the main area of ​​the electronic device protective film, through which users obtain information from the screen. Edge area 41 is the location of the "black border" in existing electronic device protective film solutions. This area division method facilitates targeted design and performance optimization for different parts of the electronic device protective film.

[0039] The light transmittance of the light-transmitting area 42 is no less than 90%. Light transmittance is an indicator that measures a material's ability to allow light to pass through, expressed as a percentage. For the light-transmitting area 42 of the electronic device protective film, a higher light transmittance (no less than 90%) means that most light can pass through. This allows users to obtain a clear visual effect when using devices (such as mobile phones, tablets, etc.) with the protective film installed, reducing problems such as blurry screen display and color distortion caused by the protective film blocking light, thus ensuring a good visual experience.

[0040] This application addresses the issue of black edges on electronic device protective films by limiting light transmittance. The difference in light transmittance between the light-transmitting area 42 and the edge area 41 does not exceed 15%, ensuring the consistency of the overall light transmittance performance of the electronic device protective film. If the difference in light transmittance between the light-transmitting area 42 and the edge area 41 is too large, users may clearly perceive a visual difference between the edge area 41 and the central light-transmitting area 42 during use; for example, the edge may appear darker or brighter, affecting aesthetics and user experience. Controlling the light transmittance difference to no more than 15% makes the electronic device protective film appear more uniform visually, reducing visual interference caused by inconsistent light transmittance, improving the overall performance of the electronic device protective film and the user experience, ensuring both good light transmittance and visual consistency.

[0041] Existing protective films typically have black ink sprayed on the edges to create a "black edge," resulting in extremely low light transmittance at the edges. The difference in transmittance between the transparent area and the edge area far exceeds 15%. Firstly, black is a color with a strong ability to absorb light, absorbing almost all visible light. After black ink is sprayed on the edges of the protective film, most of the light is absorbed by the black ink, with only a very small portion able to pass through, leading to extremely low transmittance at the edges. Secondly, the ink adheres to the surface of the protective film's edge area, forming a layer of a certain thickness. This ink layer also blocks light. Even if some light reaches the protective film material beneath the ink layer, it undergoes multiple reflections and scatterings within the ink layer, further reducing the amount of light transmitted and significantly lowering the transmittance at the edges.

[0042] In some specific embodiments, the edge region 41 and the light-transmitting region 42 share at least one of the following: transmittance, reflectance, and refractive index. By limiting the optical physical properties of the edge region 41 and the light-transmitting region 42, visual consistency between them is ensured. In practical applications, this optical property can be achieved by precisely controlling the material composition and manufacturing process of different areas of the electronic device protective film.

[0043] Uniform light transmittance: This means that the light transmission capacity is consistent from the center light-transmitting area 42 to the edge area 41 of the electronic device's protective film. This ensures that no matter the viewing angle, there will be no difference in brightness due to varying light transmittance in different areas, guaranteeing screen uniformity and providing users with a comfortable, visually undisturbed viewing experience.

[0044] Uniform reflectivity: Uniform reflectivity ensures consistent light reflection across the entire protective film of electronic devices. This reduces differences in reflected light intensity and angle caused by variations in reflectivity between the edge area 41 and the light-transmitting area 42, thereby reducing glare and uneven reflection caused by external light reflecting off the film surface. This helps improve screen visibility and clarity under different lighting conditions, allowing users to see screen content more clearly even in bright light.

[0045] Same refractive index: A consistent refractive index helps ensure that light refracts consistently across different areas as it enters the protective film of electronic devices from the air and propagates within the film. This reduces refractive deviations and scattering of light as it travels between different areas, further improving the efficiency and uniformity of light transmission. It also helps maintain the clarity and accuracy of the screen image, avoiding image distortion or blurring caused by differences in refractive index.

[0046] The electronic device protective film can be a planar film or a curved film. When the electronic device protective film is a planar film, both the edge area 41 and the light-transmitting area 42 are planar portions. Preferably, the electronic device protective film is a curved film, comprising a planar portion and a curved portion, wherein the light-transmitting area 42 at least includes the planar portion, and the edge area 41 is disposed within the curved portion. (See attached image.) Figure 3 A schematic diagram showing the curved surface of edge region 41 is shown, with attached... Figure 4 A schematic diagram of the planar portion of edge region 41 is shown. (Attached) Figure 3 and attached Figure 4The multi-layer structure of the protective film for electronic devices is shown. From top to bottom, it consists of an electroplated coating 45 (corresponding to the functional coating 18 in Example 4), a glass substrate 44 (corresponding to the light-transmitting substrate 11 in Example 4), and an adhesive layer 43 (corresponding to the combination of the elastic adhesive layer 12, the first adhesive layer 14, and the second adhesive layer 15 in Example 4). The adhesive layer 43 is used to bond the screen, and the outermost electroplated coating 45 is used for protection. For most electronic device screens, the planar light-transmitting area 42 can better fit the screen surface and provide good protection. The light-transmitting area 42 is planar, while the edge area 41 can be designed as either planar or curved, providing more suitable protection and user experience based on the characteristics of different electronic device screens and user needs. The planar design of the light-transmitting area 42 ensures the stability of its light transmission performance and the consistency of screen display, reducing light refraction and scattering caused by changes in surface curvature, thereby ensuring that users can see the screen content clearly and accurately. When the edge area 41 is curved, it is mainly to accommodate some electronic devices with curved screens. The design of the edge area 41 can be determined according to the specific electronic product's surface.

[0047] In some specific embodiments, the light-transmitting area 42 is provided with an adhesive layer 43 for connecting an external screen, and the adhesive layer 43 extends at least to the edge area 41. The structure of the adhesive layer 43 is shown in the attached figure. Figure 5 As shown. The main purpose of the adhesive layer 43 in the light-transmitting area 42 is to achieve a firm connection between the electronic device protective film and the screen of the external device (such as a mobile phone, tablet, etc.). The adhesive layer 43 allows the electronic device protective film to adhere tightly to the screen surface. Extending the adhesive layer 43 at least to the edge area 41 further improves the connection stability between the electronic device protective film and the device screen. The edge area 41 is where the electronic device protective film is easily subjected to external forces (such as finger pressure, impacts, etc.). If the adhesive layer 43 is limited to the light-transmitting area 42, the edge portion may easily lift or fall off due to insufficient adhesion. Extending the adhesive layer 43 to the edge area 41 ensures that the edge portion is also firmly fixed, enhancing the overall adhesion of the electronic device protective film and making it less likely to detach from the screen.

[0048] In some specific embodiments, a sealing structure 434 (corresponding to the sealing layer 16 in embodiment 4) is provided at the edge of the adhesive layer 43 to seal the edge of the adhesive layer 43. The sealing structure 434 is as follows: Figure 3As shown in the diagram. The primary function of the sealing structure 434 is to prevent the intrusion of impurities such as dust, moisture, and oil. Dust may form visible spots on the screen, affecting visual effects; moisture intrusion may cause serious problems such as screen corrosion and short circuits, affecting the normal use of the device; oil and other contaminants may also affect the touch performance of the screen. By setting the sealing structure 434 at the edge of the adhesive layer 43, these impurities can be effectively blocked, keeping the area between the electronic device protective film and the screen clean, thereby protecting the screen from damage and extending the device's lifespan. Furthermore, the sealing structure 434 can, to a certain extent, fix the edge of the adhesive layer 43, making it less prone to deformation or detachment, further ensuring a firm connection between the electronic device protective film and the screen. There are various common forms of sealing structure 434, such as adding a ring of sealant to the edge of the adhesive layer 43 or using a special sealing film to cover the edge of the adhesive layer 43. The choice and application can be based on the specific design and manufacturing process of the electronic device protective film. In practical applications, epoxy resin adhesive is applied around the edge of the adhesive layer 43 using a dispensing machine, and then baked in a tunnel oven at a high temperature of 60-80℃ to cure the adhesive. This process can effectively seal the edges of the adhesive layer 43, preventing dust and debris from entering.

[0049] In some specific embodiments, the sealing structure 434 includes an epoxy resin adhesive layer structure. A sealing ring is formed by dripping epoxy resin adhesive onto the edge of the adhesive layer 43.

[0050] In some specific embodiments, the thickness of the electronic device protective film ranges from 0.15 to 0.25 mm. A protective film with a thickness between 0.15 and 0.25 mm can resist external impacts and friction to a certain extent. If the thickness is less than 0.15 mm, the protective film may lack strength and easily break under significant external force, failing to effectively protect the screen. If the thickness is greater than 0.25 mm, although the strength may increase, the protective film becomes too thick and heavy, affecting the device's portability and potentially impacting the screen's touch sensitivity. The thickness of the electronic device protective film also affects its optical performance. Within the 0.15-0.25 mm thickness range, the light transmittance of the protective film can be well guaranteed, and light refraction and reflection can be reduced, thereby ensuring the clarity and color reproduction of the screen display.

[0051] In this application, the thickness side is the side of the protective film for electronic devices in the thickness direction, corresponding to the planar side.

[0052] In some specific embodiments, the surface roughness of the edge region 41 on the thickness side is less than Ra 0.5 μm. Surface roughness refers to the unevenness of a processed surface, characterized by small gaps and minute peaks and valleys. Its value, Ra (arithmetic mean deviation of the profile), represents the arithmetic mean of the absolute values ​​of the profile deviations within the sampling length. Specifying that the surface roughness of the edge region 41 on the thickness side is less than Ra 0.5 μm means that the surface of the edge region 41 in the thickness direction is relatively smooth. When a user holds or operates an electronic device with this protective film, the contact between their fingers and the edge of the protective film is smoother, without a rough or prickly feeling, thus improving user comfort. Furthermore, the smooth surface makes it less likely for dust, dirt, moisture, and other impurities to adhere to the edge region 41. During the production process of the electronic device protective film, the edge processing technology is strictly controlled, such as using appropriate grinding and polishing methods, to ensure that the specified surface roughness requirements are met, thereby guaranteeing the consistency and stability of product quality.

[0053] In some specific embodiments, under 60° gloss measurement conditions, the gloss value of the edge area 41 on the thickness side is not less than 60 GU. Gloss refers to the ability of an object's surface to reflect visible light and is used to measure the brightness of an object's surface. A higher gloss (not less than 60 GU) makes the edge area 41 of the electronic device protective film look brighter and cleaner, improving the overall aesthetics of the product. When the electronic device protective film is installed on an electronic device, the edge with good gloss complements the screen and other parts of the device, resulting in a more visually harmonious and high-quality appearance. Achieving this gloss requirement means that the surface processing precision of the edge area 41 is high, with a smooth, flat surface and no obvious defects. In practical applications, polishing and other processes can also be used to improve the gloss on the thickness side.

[0054] In some specific embodiments, the adhesive layer 43 includes a multilayer adhesive layer structure, and the middle adhesive layer 43 structure is a first silicone gel layer 432, as shown in the attached figure. Figure 5 As shown. In the appendix Figure 5 In the middle, the first silicone gel layer 432 is located, flanked by acrylic adhesive layers 431 and venting adhesive layers 433. This multi-layer adhesive structure integrates the properties of different adhesive materials, leveraging the advantages of each layer to improve the overall performance of adhesive layer 43. Different adhesive layers can perform different functions, and through the synergistic effect of the multi-layer structure, adhesive layer 43 exhibits better performance in terms of adhesion, durability, and flexibility.

[0055] For example, acrylic adhesive layer 431 is a high-viscosity OCA acrylic adhesive (adhesive strength ≥2N / cm), and venting adhesive layer 433 is a low-viscosity, high-permeability venting silicone (flowability dynamic viscosity ≤500cP), achieving rapid venting and strong adhesion. The intermediate adhesive layer is filled with silicone gel (elastic and semi-flowable), which can automatically fill the curvature of the screen and reduce the generation of air bubbles and white edges. Silicone gel has unique flexibility, and when located in the middle of adhesive layer 43, it can effectively buffer the impact force on the electronic device protective film and screen. When the device is hit or squeezed, the first silicone gel layer 432 can undergo a certain degree of deformation, absorbing and dispersing the external force, reducing the direct impact force on the screen, thereby better protecting the screen from damage. In addition, silicone gel has a certain adsorption capacity, which can adhere tightly to the upper and lower adhesive layers as well as the electronic device protective film and screen surface, further enhancing the overall adhesion of adhesive layer 43. It can fill tiny gaps and unevenness, making the contact between the electronic device protective film and the screen tighter, reducing the generation of air bubbles and gaps, and improving the protective effect. The adhesive layer 43 adopts a multi-layer structure with a first silicone gel layer 432 in the middle. By making reasonable use of the characteristics of different materials, the performance of the adhesive layer 43 is optimized and improved, providing better protection, display and user experience for electronic device protective films.

[0056] This embodiment provides a protective film for electronic devices. By controlling the light transmittance of the edge of the protective film, black edges are removed, effectively avoiding obvious visual dividing lines caused by excessive differences in light transmittance. This makes the entire protective film for electronic devices look more uniform and natural. Whether viewed from the front or the side, there will be no abrupt black edges or color differences, enhancing the overall aesthetics of the mobile phone screen.

[0057] Example 2

[0058] Embodiment 2 of this application also provides a protective film for electronic devices, such as... Figure 6-9 As shown, it includes:

[0059] The protective film body 21 (corresponding to the light-transmitting substrate 11 in Embodiment 4) is used to cover and protect the screen of electronic devices;

[0060] Electronic devices refer to devices that use electrical energy as power or achieve functions through electronic technology, covering multiple fields such as consumer electronics, industrial equipment, and medical instruments;

[0061] Specifically, in some embodiments of this application, the electronic device can be a mobile phone, tablet, smartwatch, laptop, etc. in the consumer electronics field; it can also be a smart TV, electronic photo frame, smart speaker in the home appliance field; it can also be an industrial control touch screen, medical monitor, POS machine in the industrial equipment field; or it can be a central control screen, dashboard, HUD head-up display in the automotive electronics field; of course, there is no limitation on the specific type of electronic device. More specifically, in some embodiments of this application, the electronic device mainly refers to mobile phones, tablets, and laptops.

[0062] An adhesive layer 22 (corresponding to the combination of elastic adhesive layer 12, first adhesive layer 14 and second adhesive layer 15 in embodiment 4) is disposed on the protective film body 21 and has a first adhesive surface 2201 for connecting the protective film body 21 and a second adhesive surface 2202 for connecting the screen of an electronic device.

[0063] The viscosity of the first adhesive surface 2201 is not less than 500gf / 25mm, and the viscosity of the second adhesive surface 2202 is in the range of 3-12gf / 25mm.

[0064] For example, the viscosity value of the second adhesive surface 2202 can be set to 6 gf / 25 mm, and the viscosity value of the first adhesive surface 2201 can be set to 700 gf / 25 mm;

[0065] The viscosity design of the first adhesive surface 2201 and the second adhesive surface 2202 can, on the one hand, achieve good structural stability between the protective film body 21 and the adhesive layer 22 of the electronic device protective film.

[0066] On the other hand, after the electronic device protective film is attached to the screen of the electronic device, it has good bonding strength, making the electronic device protective film less likely to fall off. Moreover, before the electronic device protective film is attached to the screen of the electronic device, it is easy to adjust the connection between the electronic device protective film and the screen of the electronic device, so that the adhesion is smoother, effectively reducing the generation of air bubbles, and enhancing the aesthetics and visibility of the electronic device protective film after it is attached to the screen of the electronic device.

[0067] On the other hand, the ratio of viscosity values ​​of the first adhesive surface 2201 and the second adhesive surface 2202 is designed to improve the force effect when the protective film of electronic devices is peeled off the surface of the electronic device, making it easier to peel off the protective film of electronic devices and less likely to damage the screen of electronic devices. Even if the protective film body 21 is broken, it will not easily break or splash, thereby enhancing the safety of using the protective film of electronic devices.

[0068] Of course, there are no restrictions on the specific viscosity values ​​of the first adhesive surface 2201 and the second adhesive surface 2202, as long as they meet the preset ratio range.

[0069] Understandably, the higher viscosity of the first adhesive surface 2201 helps to achieve a firm bond between the protective film body 21 and the adhesive layer 22, preventing them from separating. The lower viscosity of the second adhesive surface 2202 reduces surface energy, achieves controllable adhesion, and allows users to fine-tune the position of the electronic device protective film and the electronic device. It also has good fluidity, enabling rapid air venting and a better adhesion effect, and can reduce the generation of bubbles and white edges, thereby reducing touch delay and maintaining touch sensitivity.

[0070] Furthermore, in some embodiments of this application, the viscosity value of the first adhesive surface 2201 is not less than 600 gf / 25 mm, and the viscosity value of the second adhesive surface 2202 is in the range of 5-10 gf / 25 mm.

[0071] Understandably, the viscosity values ​​of the first adhesive surface 2201 and the second adhesive surface 2202 are set in a way that achieves a good balance between ease of installation, structural stability of the electronic device protective film, and screen security.

[0072] The first adhesive surface 2201 has a high viscosity, which can prevent the protective film body 21 from separating from the adhesive layer 22 under the impact of a drop to a certain extent. In the drop test on a 1.5-meter concrete ground, the protective film body 21 did not break and the adhesive layer 22 did not detach.

[0073] The second adhesive surface 2202 allows users to slide and fine-tune the position multiple times during the bonding process, creating a floating effect. This allows for slow air release, making it easier to achieve bubble-free bonding and effectively reducing the bonding misalignment rate. The second adhesive surface 2202 also enables a non-destructive film removal effect, leaving almost no adhesive residue when removing the protective film. A 100,000-cycle peel-and-paste test showed no coating damage, and the adhesive residue rate can be reduced to approximately 0.1%, protecting the oleophobic layer and OLED pixel coating of electronic device screens.

[0074] Furthermore, such as Figure 7 and Figure 9 As shown, the adhesive layer 22 has a multi-layer structure.

[0075] The adhesive layer 22 includes a first adhesive layer 221 (corresponding to the first adhesive layer 14 in Embodiment 4), a first base layer 222, a second silicone gel layer 223 (corresponding to the elastic adhesive layer 12 in Embodiment 4), a second base layer 224, and a second adhesive layer 225 (corresponding to the second adhesive layer 15 in Embodiment 4), arranged sequentially. The side of the first adhesive layer 221 facing away from the first base layer 222 is the first adhesive surface 2201, and the side of the second adhesive layer 225 facing away from the second base layer 224 is the second adhesive surface 2202. The first adhesive layer 221 has high adhesion properties and can be made of acrylic or epoxy resin, which can adhere to the protective film body 21 and enhance the peel resistance between the adhesive layer 22 and the protective film body 21.

[0076] The first base layer 222 and the second base layer 224 can be made of PET (polyethylene terephthalate) or PI (polyimide) material, providing structural support and load-bearing capacity, enhancing the structural stability of the protective film, and helping to disperse stress. The second silicone gel layer 223 has good elasticity and semi-flowability, effectively absorbing vibration, adapting to deformation, and preventing adhesive overflow. It can automatically fill the curvature of the screen and reduce the generation of bubbles and white edges. The second adhesive layer 225 can be made of low-modulus silicone pressure-sensitive adhesive material to adapt to the complex surface of electronic screens and reduce adhesive residue.

[0077] More specifically, in some embodiments of this application, the first adhesive layer 221 includes an OCA optical adhesive layer, the first base layer 222 and the second base layer 224 include PET substrate layers, and the second adhesive layer 225 includes a silicone layer.

[0078] Understandably, the layered design of the adhesive layer 22 can enhance the applicability and functionality of the electronic device protective film to meet different performance requirements. For example, the first adhesive layer 221 and the second adhesive layer 225 can provide different adhesion forces, and due to the different materials used, different adhesion effects can be obtained to adapt to the different material properties of the protective film body 21 and the electronic device screen. The substrate layer enhances the physical strength of the electronic device protective film, and the second silicone gel layer 223 acts as a buffer to reduce the impact of external forces. It can also enhance the adhesion of the electronic device protective film, better adapt to different surface morphologies, reduce the possibility of air bubbles during installation, and the silicone gel itself usually does not cause scratches on the surface.

[0079] Furthermore, the thickness of the first adhesive layer 221 is between 28-32 μm, the thickness of the first base layer 222 is between 23-27 μm, the thickness of the second silicone gel layer 223 is between 245-255 μm, the thickness of the second base layer 224 is between 36-40 μm, and the thickness of the second adhesive layer 225 is between 33-37 μm.

[0080] For example, in some embodiments of this application, the thickness of the first adhesive layer 221 is approximately 30 μm, the thickness of the first base layer 222 is approximately 25 μm, the thickness of the second silicone gel layer 223 is approximately 250 μm, the thickness of the second base layer 224 is approximately 38 μm, and the thickness of the second adhesive layer 225 is approximately 35 μm. Of course, there are no restrictions on the specific thickness of each layer, as long as it meets the preset value range.

[0081] By designing the thickness of each layer, the strength, impact resistance, and tensile strength of the protective film for electronic devices can be improved, achieving better structural stability and facilitating the bonding requirements of curved screens. Furthermore, the overall thickness of the adhesive layer 22 is between 370-400 μm, and its light transmittance is not less than 90%. For example, the overall thickness of the adhesive layer 22 can be approximately 378 μm; for example, the light transmittance of the adhesive layer can be not less than 92%; of course, no specific limitation is made on the thickness of the adhesive layer 22; understandably, limiting the overall thickness of the adhesive layer 22 to between 370-400 μm can match the thickness of the protective film body 21 to obtain better elasticity, stability, and toughness.

[0082] The light transmittance of the adhesive layer 22 was tested using a transmittance tester, and it was found that the transmittance was not less than 92%, indicating good light transmittance. This reduces light loss due to heat dissipation or absorption when light passes through the adhesive layer 22, helping to reduce image distortion and allowing the electronic device to maintain good display and sensing effects. Furthermore, the haze of the adhesive layer 22 is not higher than 0.6%. The haze of the adhesive layer 22 was tested using a haze tester, and it was found to be no higher than 0.6%. Controlling the haze of the adhesive layer 22 to below 0.6% achieves high transparency, helps reduce image blurring or unclearness caused by scattering, and improves the clarity of screen light passing through the adhesive layer 22, thereby ensuring that the screen surface maintains high visual clarity.

[0083] Furthermore, such as Figure 8 As shown, a release film 23 is also provided, covering the protective film body 21 and / or the adhesive layer 22. The presence of the release film 23 helps to prevent the protective film body 21 and / or the adhesive layer 22 from being contaminated or coming into contact with external substances before storage, transportation, and use, keeping them clean and dust-free. This allows the electronic device protective film to provide a better adhesion effect when applied to the screen, reducing the likelihood of air bubbles or impurities. The release film 23 not only prevents the adhesive layer 22 from being damaged during storage and transportation but also protects the surface of the protective film body 21 from scratches and impacts during transportation. Further, the release film 23 includes a PET release film with a thickness between 40-60 μm. For example, the thickness of the release film 23 can be 50 μm; however, there is no limitation on the specific thickness of the release film 23. PET release film 23 with a thickness between 40-60um has high strength, which can effectively withstand the pressure during storage and transportation and prevent damage to the protective film of electronic devices; it also has strong tear resistance, making it less likely to tear during use; and it has high transparency, making it easy for users to observe the condition of the protective film of electronic devices.

[0084] Furthermore, the PET release film 23 has a low surface energy, resulting in excellent peel performance on different types of adhesive layers 22, allowing the electronic device protective film to adhere smoothly to the screen. Further, the thickness of the protective film body 21 is between 0.15-0.25 mm. Specifically, in some embodiments of this application, the protective film body 21 includes a tempered glass layer; exemplaryly, in some embodiments of this application, the thickness of the protective film body 21 is approximately 0.2 mm.

[0085] By limiting the thickness of the protective film body 21, good strength can be obtained on the one hand, and the touch effect of the electronic device protective film can be optimized on the other hand. The production difficulty is moderate, which effectively reduces the production cost, reduces the existing stress, and also avoids the generation of white edges.

[0086] This embodiment provides a protective film for electronic devices, which facilitates adjustment of the connection with the screen, has good screen adhesion performance, and can effectively reduce the generation of air bubbles. Specifically, the viscosity values ​​of the first and second adhesive surfaces of the adhesive layer are optimized, which can maintain the connection strength between the adhesive layer and the main body of the protective film, achieve good connection stability between the adhesive layer and the screen, facilitate the removal of the electronic device protective film, reduce damage to the screen, and facilitate adjustment of the connection position between the adhesive layer and the screen for better adhesion and reduced air bubble generation.

[0087] Example 3

[0088] Embodiment 3 of this application also provides a protective film for electronic devices, including a multi-layered composite adhesive layer structure. This unique adhesive layer structure not only achieves a smooth fit with the screen, effectively preventing the formation of bubbles, but also ensures connection stability and smooth light transmission, providing users with a higher quality and more reliable screen protection solution. Figure 10-13 As shown, the specific solution is as follows:

[0089] A protective film for electronic devices includes: a glass layer 31 and an adhesive layer 32, as per the instruction manual. Figure 10 As shown; the adhesive layer 32 includes, in sequence: a first adhesive layer 321, an intermediate buffer layer 322, and a second adhesive layer 323, as per the attached instruction manual. Figure 11 As shown; the bonding strength of the first adhesive layer 321 is greater than the bonding strength of the second adhesive layer 323; the light transmittance of the first adhesive layer 321 is greater than 90%; the first adhesive layer 321 is bonded to the glass layer 31; the second adhesive layer 323 is used to vent air when bonding the external screen to achieve stable bonding with the external screen.

[0090] This embodiment provides a protective film for electronic device screens, comprising a high-strength glass layer 31 with excellent light transmittance and an adhesive layer 32 with a multi-layer composite structure. In this embodiment, the glass layer 31 is preferably made of high-alumina silicate glass, a high-performance glass with silicon dioxide and aluminum oxide as its main components. This material significantly improves the mechanical properties, chemical stability, and optical properties of traditional glass by optimizing the glass composition.

[0091] Specifically, high-alumina silicate glass has a Mohs hardness of 7H or higher, with some products approaching the hardness of sapphire (9H), far exceeding that of ordinary soda-lime glass (approximately 6H). This high hardness effectively protects the screen from scratches. Furthermore, high-alumina silicate glass boasts a visible light transmittance of over 92%, ensuring true color reproduction and no brightness reduction. Compared to the greenish tint that may occur with ordinary tempered glass, high-alumina silicate glass provides a purer visual experience. Even further, through chemical tempering, a deep compression layer is formed on the surface of high-alumina silicate glass, resisting the propagation of cracks caused by impact. Experiments show that its impact resistance is 5-10 times that of soda-lime glass, significantly reducing the risk of screen breakage. Additionally, high-alumina silicate glass has a low density, enabling ultra-thin designs of less than 0.3mm, balancing protection with a lightweight feel. Simultaneously, its highly flat surface ensures precise and smooth touch operation.

[0092] Furthermore, the adhesive layer 32 specifically comprises three tightly connected layers: a first adhesive layer 321, an intermediate buffer layer 322, and a second adhesive layer 323. Specifically, the first adhesive layer 321, as the interface directly in contact with the glass layer 31, has a higher bonding strength than the second adhesive layer 323, ensuring a stable and durable bond with the glass layer. Simultaneously, the light transmittance of this layer is optimized to over 90%, guaranteeing visual clarity and transparency. In practical applications, the first adhesive layer 321 is preferably an OCA (Optical Clear Adhesive) layer. An OCA layer is a substrate-free optically transparent special double-sided adhesive, typically composed of an intermediate substrate-free optical acrylic pressure-sensitive adhesive layer and upper and lower optical release films, possessing properties such as high clarity, high light transmittance, high adhesion, water resistance, high temperature resistance, and UV resistance. When used in protective films for electronic devices, OCA can significantly improve screen brightness and contrast by eliminating air gaps and reducing refractive index differences, thereby reducing light reflection and loss; it can also maintain stable adhesion; furthermore, OCA supports full lamination technology, which can reduce screen thickness and improve production efficiency.

[0093] The intermediate buffer layer 322 is located between the first adhesive layer 321 and the second adhesive layer 323, serving a buffering function. It effectively absorbs external impact forces, reducing damage to the screen caused by collisions or drops. Simultaneously, its material properties give the protective film a certain degree of flexibility, making the overall structure more durable. In practical applications, the intermediate buffer layer 322 is preferably a silicone gel layer. Silicone gel is a semi-transparent gel-like material with siloxane as its main component, possessing both elasticity and softness, and is chemically stable, non-toxic, and odorless. In electronic device protective films, the high elasticity and flexibility of the silicone gel layer effectively absorb impact forces, reducing the risk of screen damage caused by collisions or drops. Its cold and high temperature resistance allows it to cope with extreme temperature changes and maintain stable performance. Furthermore, the silicone gel layer is not prone to settling or deformation, maintaining its buffering effect for a long time and extending the screen's lifespan.

[0094] The second adhesive layer 323 is in direct contact with the external screen. During the bonding process, the second adhesive layer 323 can quickly expel air, forming a bubble-free, perfectly bonded interface. This not only improves aesthetics but also ensures a tight bond between the screen and the protective film, preventing it from easily falling off or shifting even after long-term use. In practical applications, the second adhesive layer 323 is preferably a silicone layer. The silicone layer is an elastic material with silicone rubber as its main component, possessing properties such as non-toxicity, odorlessness, high temperature resistance, and corrosion resistance. When used in electronic device protective films, the silicone layer can quickly expel air during bonding, forming a bubble-free, stable adhesive interface and improving the flatness of the bond. Its cold resistance, heat resistance, and corrosion resistance allow it to maintain bonding strength in complex environments. Furthermore, the silicone layer can effectively block moisture and dust, protecting internal screen components from damage while providing insulation.

[0095] In one specific embodiment, the adhesive layer 32 further includes a first substrate layer 324 (corresponding to the first substrate layer 222 in Embodiment 2) and a second substrate layer 325 (corresponding to the second substrate layer 224 in Embodiment 2), as shown in the appendix to the specification. Figure 12 As shown, this design enhances the stability and durability of the overall structure. A first substrate layer 324 is provided between the first adhesive layer 321 and the intermediate buffer layer 322 to ensure smooth transfer of bonding and buffering functions; a second substrate layer 325 is provided between the intermediate buffer layer 322 and the second adhesive layer 323 to further strengthen the overall structure of the adhesive layer 32 and improve its compressive and tensile strength.

[0096] In one specific embodiment, the first substrate layer 324 and / or the second substrate layer 325 include a PET layer. Further, the thickness of the first substrate layer 324 and the second substrate layer 325 ranges from 15 μm to 50 μm. In practical applications, the first substrate layer 324 and the second substrate layer 325 are preferably PET (Polyethylene Terephthalate) layers. The PET layer can effectively prevent scratches on the screen, reduce fingerprint retention, maintain screen clarity, have high light transmittance, and restore the original colors of the screen.

[0097] In one specific embodiment, as shown in the appendix to the specification... Figure 13 As shown, the adhesive layer 32 also includes a protective layer 326 (corresponding to the release film 23 in Embodiment 2). The protective layer 326 is provided on the side of the second adhesive layer 323 away from the intermediate buffer layer 322. In practical applications, the protective layer 326 can effectively isolate dust, grease and other contaminants in the environment before transportation, storage and bonding, ensuring the stability of the bonding activity of the first adhesive layer 321 and the second adhesive layer 323 before the bonding operation.

[0098] In one specific embodiment, the protective layer 326 includes a release film layer. In practical applications, the release film layer can achieve residue-free peeling. The thickness range of the release film layer includes 30μm-70μm, which can effectively protect the structure inside the second adhesive layer 323 and the electronic device protective film.

[0099] In one specific embodiment, the first adhesive layer 321 includes an OCA adhesive layer, the intermediate buffer layer 322 includes a silicone gel layer, and the second adhesive layer 323 includes a silicone layer. The OCA layer is a substrate-free, optically transparent special double-sided adhesive. Its structure typically consists of an intermediate substrate-free optical acrylic pressure-sensitive adhesive layer and upper and lower optical release films, possessing properties such as high clarity, high light transmittance, high adhesion, water resistance, high temperature resistance, and UV resistance. When used in protective films for electronic devices, it can significantly improve screen brightness and contrast by eliminating air gaps and reducing refractive index differences, thereby reducing light reflection and loss; it can maintain stable adhesion; furthermore, OCA supports full lamination technology, which can reduce screen thickness and improve production efficiency.

[0100] Silicone gel is a semi-transparent gel-like material with siloxane as its main component. It is both elastic and flexible, chemically stable, and non-toxic and odorless. When used in protective films for electronic devices, the high elasticity and flexibility of the silicone gel effectively absorb impact, reducing the risk of screen damage from collisions or drops. Its cold and high temperature resistance allows it to withstand extreme temperature changes and maintain stable performance. Furthermore, the silicone gel layer is not prone to settling or deformation, maintaining its cushioning effect for a long time and extending the screen's lifespan.

[0101] The silicone layer is an elastic material with silicone rubber as its main component, possessing properties such as non-toxicity, odorlessness, high temperature resistance, and corrosion resistance. When used in protective films for electronic devices, the silicone layer quickly expels air during adhesion, forming a stable, bubble-free bonding interface and improving adhesion smoothness. Its cold resistance, heat resistance, and corrosion resistance allow it to maintain bonding strength in complex environments. Furthermore, the silicone layer effectively blocks moisture and dust, protecting internal screen components from damage while providing insulation.

[0102] In one specific embodiment, the thickness of the first adhesive layer 321 ranges from 15μm to 45μm. The first adhesive layer 321 uses an optical-grade acrylic adhesive, which has both high light transmittance and strong adhesion. The thickness range of 15μm to 45μm ensures molecular-level bonding with the glass layer 31 and avoids touch sensitivity attenuation due to excessive thickness. The thickness of the intermediate buffer layer 322 ranges from 200μm to 300μm. The thickness of the second adhesive layer 323 ranges from 20μm to 50μm, which takes into account both wear resistance and chemical corrosion resistance, ensuring long-term reliability in complex usage environments.

[0103] In one specific embodiment, the glass layer 31 includes a high aluminosilicate glass layer with a thickness ranging from 0.1 mm to 0.3 mm. The thickness range of 0.1 mm to 0.3 mm satisfies the drop impact protection requirements while achieving a light transmittance of over 92%, thus balancing the contradiction between protective performance and optical performance.

[0104] In one specific embodiment, the edge of the glass layer 31 is bent toward the adhesive layer 32 to form a curved surface that adheres to the external screen. In practical applications, to adapt to the increasingly complex curved shapes of electronic device screens, the glass layer 31 is subjected to a hot bending forming process to achieve bending deformation of the edge region, so that the electronic device protective film A in this embodiment can be completely adhered to the curved screen of the electronic device, significantly enhancing the reliability of the electronic device protective film A in complex usage environments.

[0105] This embodiment 3 provides a protective film for electronic devices, including an adhesive layer structure with a multi-layer composite structure. With its unique adhesive layer structure, it not only achieves a smooth fit with the screen and effectively avoids the generation of bubbles, but also ensures the stability of the connection and the smooth transmission of light, providing users with a higher quality and more reliable screen protection solution.

[0106] Example 4

[0107] Please refer to Figures 14 to 17 The present invention provides a curved screen protective film, comprising: a light-transmitting substrate 11 and an elastic adhesive layer 12.

[0108] Specifically, one side of the elastic adhesive layer 12 is bonded to the light-transmitting substrate 11, and the other side of the elastic adhesive layer 12 is used to bond to the curved screen. (See attached image) Figure 14 As shown. Thus, the light-transmitting substrate 11 can be bonded to the curved screen through the elastic adhesive layer 12 to protect the curved screen, and the light-transmitting substrate 11 can allow the light emitted by the curved screen to pass through based on its own light transmittance, so that the user can view the content on the curved screen.

[0109] The edge of the light-transmitting substrate 11 bends toward the side where the elastic adhesive layer 12 is located, thereby forming a curved section 111 surrounding the elastic adhesive layer 12. Specifically, the curved section 111 is the portion of the light-transmitting substrate 11 that adapts to the curved edge of the curved screen. Please refer to... Figure 15 The edge of the elastic adhesive layer 12 extends to the curved section 111 and cooperates with the curved section 111 to form a buffer gap 13. The elastic adhesive layer 12 is used to fill the buffer gap 13 when it is bonded and pressed with the curved screen. The portion of the edge of the elastic adhesive layer 12 extending to the curved section 111 is curved with the same curvature as the curved section 111.

[0110] In this invention, the elastic adhesive layer 12 is elastic, and the elastic adhesive layer 12 and the curved section 111 cooperate to form a buffer gap 13. When the elastic adhesive layer 12 is bonded and squeezed with the curved screen, it will deform based on its own elasticity, so that its edge extends outward along the curved section 111 and gradually fills the buffer gap 13. In this process, the elastic adhesive layer 12 will automatically and evenly fill the curvature of the curved screen and discharge air bubbles from the buffer gap 13. This effectively solves the problems of uneven adhesive layer and insufficient air venting in traditional curved screen protective films, reduces the generation of white edges and air bubble residue, and eliminates the need for screen printing black edges to meet the design requirements of fully transparent curved screen protective films.

[0111] For example, the light-transmitting substrate 11 can be made of tempered glass, such as high-alumina silicate glass. Thus, the curved section 111 at the edge of the light-transmitting substrate 11 can be formed by a high-temperature hot bending process, and the curved section 111 is integrally formed with the main body of the light-transmitting substrate 11, which is the flat section 112 on the light-transmitting substrate 11. Optionally, the thickness of the main body of the light-transmitting substrate 11, i.e., the thickness H1 of the flat section 112, can be between 0.15 mm and 0.3 mm, and the thickness H2 of the curved section 111 formed at the edge of the light-transmitting substrate 11 can be between 0.1 mm and 0.2 mm. For example, the thickness H1 of the main body of the light-transmitting substrate 11 can be 0.15 mm, 0.2 mm, or 0.3 mm, and the corresponding thickness H2 of the curved section 111 can be 0.1 mm, 0.15 mm, and 0.2 mm, respectively. When the thickness of the light-transmitting substrate 11 changes, the thickness of the elastic adhesive layer 12 can also change accordingly. This utility model does not specifically limit the thickness of the elastic adhesive layer 12.

[0112] For example, the distance from the edge of the elastic adhesive layer 12 along the bending direction of the bending segment 111 to the end of the bending segment 111 is defined as the length of the buffer notch 13, which is preferably less than 0.2 mm.

[0113] In one specific embodiment, please refer to Figure 17 The elastic adhesive layer 12 may also be provided with a first adhesive layer 14 and a second adhesive layer 15 on both sides. One side of the elastic adhesive layer 12 is bonded to the light-transmitting substrate 11 through the first adhesive layer 14, and the other side of the elastic adhesive layer 12 is used to bond the curved screen through the second adhesive layer 15.

[0114] In this embodiment, by providing a first adhesive layer 14 and a second adhesive layer 15 on both sides of the elastic adhesive layer 12, the resulting adhesive layer has a sandwich structure. This provides stable structural support for the middle elastic adhesive layer 12 and also improves product performance based on the characteristics of the first and second adhesive layers 14 and 15. For example, the first adhesive layer 14 can be a high-viscosity OCA acrylic adhesive with an adhesion strength ≥2N / cm, thereby making the adhesion between it and the light-transmitting substrate 11 more stable. The second adhesive layer 15 can be a low-viscosity, high-transmittance silicone layer with a flow dynamic viscosity ≤500cP, thereby enabling rapid venting when bonding with a curved screen, further improving the adequacy of venting and reducing the generation of air bubbles.

[0115] In other cases, the first adhesive layer 14 and the second adhesive layer 15 may also include adhesive layers of other materials and structures. For example, the first adhesive layer 14 and the second adhesive layer 15 may also be a multilayer composite structure, that is, a composite of multiple adhesive layers, rather than a single adhesive layer.

[0116] In one specific embodiment, the elastic adhesive layer 12 may include a silicone gel layer. Specifically, the silicone gel layer has good elasticity and semi-flowability, and under compression, the silicone gel layer can deform to extend along the curved section 111 to fill the buffer gap 13. In other cases, the elastic adhesive layer 12 may also be a polyurethane gel layer, a silicone-modified acrylate adhesive, or other adhesive layers with elasticity or semi-flowability.

[0117] In one specific embodiment, please refer to Figure 16The edge of the elastic adhesive layer 12 may be provided with a sealing layer 16 for isolating external impurities, and the sealing layer 16 is located in the buffer notch 13. Exemplarily, the sealing layer 16 may be an epoxy resin layer. Specifically, in practical applications, epoxy resin adhesive can be applied around the edge of the elastic adhesive layer 12 using a dispensing machine, and then baked in a tunnel oven at a high temperature of 60-80°C to cure the adhesive, thereby forming an epoxy resin layer. The epoxy resin layer can effectively seal the edge of the elastic adhesive layer, thereby preventing dust and debris from entering. This embodiment, while eliminating the black edge of the silkscreen printing, can still effectively limit external impurities from entering the protective film from the side, greatly improving the user experience.

[0118] Optionally, the sealing layer 16 can partially fill the buffer gap 13, or it can be like... Figure 16 The buffer gap 13 is completely filled as shown. When the elastic adhesive layer 12 deforms and extends outward along the curved section 111, the sealing layer 16 is driven by the elastic adhesive layer 12 to extend outward synchronously, so that the elastic adhesive layer 12 gradually fills the buffer gap 13.

[0119] In one specific embodiment, please refer again to Figure 16 On the side of the curved section 111 away from the elastic adhesive layer 12, an optically transparent transition layer 17 is also provided to shield the edge of the elastic adhesive layer 12. The optically transparent transition layer 17 is a structural layer used to optimize light transmission performance.

[0120] For example, the optically transparent transition layer 17 can be configured to be formed by nanoscale polishing of the curved section 111. The provision of the optically transparent transition layer 17 reduces the roughness of the surface of the curved section 111, presenting a smooth and flat state at the microscopic level. When light shines on the optically transparent transition layer 17, the light can propagate smoothly and orderly, thereby reducing irregular scattering and reflection caused by the unevenness of the surface, and thus effectively blocking the white edge formed by the edge of the elastic adhesive layer 12.

[0121] In one specific embodiment, the curvature of the side of the curved segment 111 away from the elastic adhesive layer 12 is less than or equal to the curvature of the side of the curved segment 111 close to the elastic adhesive layer 12. Understandably, setting the curvature of the side of the curved segment 111 away from the elastic adhesive layer 12 to be smaller reduces stress concentration on the curved segment 111 during everyday bumps and knocks, lowering the risk of edge breakage. It also makes the side of the curved segment 111 away from the elastic adhesive layer 12 smoother, avoiding excessively sharp or steep curvature that could affect the smoothness and comfort of the user's sliding operation.

[0122] In one specific embodiment, please refer to Figures 15 to 17The transparent substrate 11 may also have a functional coating 18 on the side away from the elastic adhesive layer 12 to enhance the user experience. Optionally, the functional coating 18 may include any one of an electroplated anti-fingerprint coating, an anti-scratch coating, an anti-blue light coating, or an antibacterial coating, thereby achieving the functions of anti-fingerprint, anti-scratch, anti-blue light, or antibacterial.

[0123] This embodiment provides a curved screen protective film. Based on the elasticity of the elastic adhesive layer, and the elastic adhesive layer and the curved section forming a buffer gap, the elastic adhesive layer deforms due to its own elasticity when it is bonded and squeezed to the curved screen. This causes its edge to extend outward along the curved section and gradually fill the buffer gap. In this process, the elastic adhesive layer automatically and evenly fills the curvature of the curved screen and discharges air bubbles from the buffer gap. This effectively solves the problems of uneven adhesive layer and insufficient air venting in traditional curved screen protective films, reduces the generation of white edges and air bubble residue, and eliminates the need for screen printing black edges, thus meeting the design requirements of a fully transparent curved screen protective film.

[0124] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Many other equivalent embodiments may be included without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

[0125] The above-disclosed examples are only a few specific implementation scenarios of this utility model. However, this utility model is not limited to these. Any variations that can be conceived by those skilled in the art should fall within the protection scope of this utility model.

Claims

1. A protective film for electronic devices, characterized in that, It includes a light-transmitting area for displaying content on an electronic device screen and an edge area located at at least part of the edge of the light-transmitting area, wherein the light transmittance of the light-transmitting area is not less than 90%, and the difference in light transmittance between the light-transmitting area and the edge area does not exceed 15%.

2. The electronic device protective film according to claim 1, characterized in that, The edge region and the light-transmitting region are identical in at least one of the following: light transmittance, reflectance, and refractive index.

3. The electronic device protective film according to claim 1, characterized in that, The electronic device protective film includes a flat portion and a curved portion, the light-transmitting area includes at least the flat portion, and the edge area is located within the curved portion.

4. The electronic device protective film according to claim 1, characterized in that, The light-transmitting area is provided with an adhesive layer for connecting to an external screen, and the adhesive layer extends at least to the edge area.

5. The electronic device protective film according to claim 4, characterized in that, The edge of the adhesive layer is provided with a sealing structure to seal the edge of the adhesive layer.

6. The electronic device protective film according to claim 5, characterized in that, The sealing structure includes an epoxy resin adhesive layer structure.

7. The electronic device protective film according to claim 1, characterized in that, The thickness of the protective film for the electronic device ranges from 0.15 to 0.25 mm.

8. The electronic device protective film according to claim 1, characterized in that, The surface roughness of the edge region on the thickness side is less than Ra0.5μm.

9. The electronic device protective film according to claim 1, characterized in that, Under 60° gloss measurement conditions, the gloss value of the edge area on the thickness side is not less than 60 GU.

10. The electronic device protective film according to claim 4, characterized in that, The adhesive layer comprises a multi-layer adhesive layer structure, with the middle adhesive layer being a silicone gel layer.

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