Screen protection film and preparation method thereof, screen protection cover plate, and electronic device
By introducing a hydrogenated graphene thermally conductive layer into the screen protector, the problems of modulus reduction and slippage at high temperatures are solved, achieving higher impact resistance and anti-slip performance, and improving the screen protection effect of electronic devices.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- HONOR DEVICE CO LTD
- Filing Date
- 2024-09-30
- Publication Date
- 2026-06-16
AI Technical Summary
Existing screen protectors have a lower modulus when the temperature rises, which weakens their impact resistance and makes them prone to slippage, thus failing to effectively protect the screens of electronic devices.
The hydrogenated graphene thermal conductive layer is combined with the substrate layer. The hydrogenated graphene thermal conductive layer provides damping performance by accelerating heat conduction and absorbing energy when it breaks under external impact, thereby enhancing its impact resistance and anti-slip capability.
It improves the impact resistance of the screen protector, reduces slippage, and enhances the protection of electronic device screens.
Smart Images
Figure CN118893894B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of electronic device manufacturing technology, and in particular to a screen protector film and its preparation method, a screen protector cover plate, and an electronic device. Background Technology
[0002] With the development of electronic technology, electronic devices have become increasingly widely used and have become one of the important tools in people's daily work and life. During use, electronic devices are inevitably subject to drops and impacts, which may cause the screen to shatter.
[0003] To improve the drop resistance of electronic devices, screen protectors are usually applied to the screen. These screen protectors are typically made of thermoplastic polyurethane (TPU) elastomer. TPU has a high modulus at room temperature, providing good protection for the screen.
[0004] TPU is a highly viscoelastic polymer. As the temperature rises, such as from the heat generated by electronic devices, the material's modulus gradually decreases, causing the screen protector to soften. Once softened, the screen protector's impact resistance weakens, and it may even slip, which is detrimental to screen protection. Summary of the Invention
[0005] This application provides a screen protector and its preparation method, a screen protector cover plate, and an electronic device, which can overcome the problems in related technologies. The technical solution is as follows:
[0006] In a first aspect, embodiments of this application provide a screen protector, which includes a substrate layer and a hydrogenated graphene thermally conductive layer, wherein the hydrogenated graphene thermally conductive layer is located on one side of the substrate layer. In embodiments of this application, hydrogenated graphene refers to graphene material introduced by hydrogen bonding groups, and the hydrogenated graphene thermally conductive layer refers to a film layer made of graphene material introduced by hydrogen bonding groups.
[0007] Based on the above characteristics, the hydrogenated graphene thermal conductive layer possesses excellent thermal conductivity. It accelerates heat conduction on the screen surface, rapidly dissipating heat and reducing the temperature rise of the screen protector. This prevents a significant decrease in the modulus of the substrate layer, thus avoiding a significant weakening of the screen protector's impact resistance and helping to prevent significant slippage. The surface of the hydrogenated graphene thermal conductive layer has numerous hydrogen bonds. These bonds can break during external impacts, absorbing energy and reducing the impact on electronic devices. Furthermore, the hydrogen bonds are regenerable and provide damping, improving the screen protector's damping performance and further suppressing slippage. This results in higher impact and slip resistance, enhancing the protection of electronic devices.
[0008] In some examples, the thickness of the hydrogenated graphene thermally conductive layer does not exceed 80 nm.
[0009] Based on the above characteristics, by setting the thickness of the hydrogenated graphene thermal conductive layer to 80nm, the total thickness of the screen protector can be reduced, and the screen protector has better light transmittance and less impact on the display effect.
[0010] In some examples, the thickness of the substrate layer is 60μm to 120μm. Setting the thickness of the substrate layer within this range allows the screen protector to have good impact resistance without resulting in an excessively large total thickness.
[0011] In some examples, the substrate layer is doped with hydrogenated graphene. Doping the substrate layer with hydrogenated graphene improves its impact resistance. Furthermore, the hydrogenated graphene incorporated into the substrate layer also helps improve its thermal conductivity, thereby further accelerating heat dissipation and preventing significant slippage of the screen protector.
[0012] In some examples, the screen protector further includes an adhesive layer and a release layer. The adhesive layer is located on the side of the hydrogenated graphene thermally conductive layer away from the substrate layer, and the release layer is located on the side of the adhesive layer away from the hydrogenated graphene thermally conductive layer. The adhesive layer is used to attach the screen protector to the electronic device. The release layer protects the adhesive layer and facilitates the storage and transportation of the screen protector. The release layer can be removed before attaching the screen protector to the electronic device.
[0013] In some examples, the screen protector also includes a self-healing layer located on the other side of the substrate layer. By providing a self-healing layer, the screen protector can absorb some of the impact energy when subjected to external impacts, further reducing the impact on the electronic device and also preventing scratches.
[0014] In other examples, the screen protector further includes a protective layer located on the side of the self-healing layer away from the substrate layer. Before the screen protector is used, the protective layer protects the self-healing layer from damage during storage and transportation. The protective layer can be removed after the screen protector is applied to the electronic device.
[0015] Secondly, embodiments of this application provide a method for preparing a screen protector, the method comprising forming a hydrogenated graphene thermally conductive layer on one side of a substrate layer.
[0016] In some examples, forming a hydrogenated graphene thermally conductive layer on one side of the substrate layer includes:
[0017] A hydrogenated graphene mixture is formed on one side of the substrate layer;
[0018] The hydrogenated graphene mixture on the surface of the substrate layer is dried to form the hydrogenated graphene thermally conductive layer.
[0019] Based on the above characteristics, a thin hydrogenated graphene thermal conductive layer with a complete structure can be prepared on the surface of the substrate layer.
[0020] For example, forming a hydrogenated graphene mixture on one side of the substrate layer includes: pouring the hydrogenated graphene mixture onto one side of the substrate layer; or immersing one side of the substrate layer in the hydrogenated graphene mixture and then removing it. Directly pouring the hydrogenated graphene mixture onto the substrate surface, or immersing one side of the substrate layer in the hydrogenated graphene mixture, are simple operations that allow the hydrogenated graphene mixture to adhere to an entire surface of the substrate layer, which is beneficial for forming a complete hydrogenated graphene thermally conductive layer.
[0021] As an example, the hydrogenated graphene mixture is poured onto one side of the substrate layer multiple times, and dried after each pour. By repeating this process multiple times, the hydrogenated graphene can be uniformly dispersed on the surface of the substrate layer, resulting in a more complete hydrogenated graphene thermal conductive layer structure that can completely cover the irradiated surface of the substrate layer.
[0022] In some examples, the method further includes, prior to pouring the hydrogenated graphene mixture onto one side of the substrate layer:
[0023] An amino compound was added to the graphene oxide mixture and then ultrasonically treated to obtain the first intermediate liquid.
[0024] The first intermediate liquid is centrifuged and separated into layers to obtain the second intermediate liquid;
[0025] The intermediate layer of the second intermediate liquid was extracted to obtain a hydrogenated graphene mixture.
[0026] Based on the above characteristics, after centrifugation and stratification of the second intermediate liquid, different graphenes are located in different positions within the mixture. Hydrogenated graphene is mainly distributed in the intermediate layer. By extracting the intermediate layer of the second intermediate liquid, a relatively pure hydrogenated graphene mixture can be obtained, which is beneficial for improving the quality of the prepared hydrogenated graphene thermally conductive layer.
[0027] In some examples, the method further includes, prior to forming a hydrogenated graphene thermally conductive layer on one side of the substrate layer:
[0028] The substrate layer is pretreated to form polar groups on the surface of the substrate layer used to form the hydrogenated graphene thermally conductive layer.
[0029] Based on the above characteristics, polar groups can form a spatially entangled network and a dense hydrogen bond network with the hydrogenated graphene thermal conductive layer, thereby improving the damping performance of the screen protector and slowing down its slippage.
[0030] As an example, the pretreatment of the substrate layer includes:
[0031] The substrate layer is subjected to irradiation treatment;
[0032] Polar groups are formed on the surface of the substrate layer by corona treatment or plasma cleaning.
[0033] Based on the above characteristics, irradiation treatment can induce molecular chain breakage on the surface of the substrate layer, forming a large number of micro-defects, which helps to increase the number of polar groups formed on the substrate layer surface. Corona treatment or plasma cleaning can enable the molecular chains of the substrate layer to provide a large number of hydrogen bond acceptors such as N and O, which helps to form a dense hydrogen bond network.
[0034] In some examples, after forming a hydrogenated graphene thermally conductive layer on one side of the substrate layer, the method further includes:
[0035] The substrate layer with the hydrogenated graphene thermally conductive layer is freeze-dried.
[0036] Based on the above characteristics, freeze drying can remove residual water molecules inside the hydrogenated graphene thermal conductive layer without damaging the two-dimensional structure of graphene, which helps to improve the thermal diffusion performance of the hydrogenated graphene thermal conductive layer.
[0037] In some examples, after forming a hydrogenated graphene thermally conductive layer on one side of the substrate layer, the method further includes:
[0038] A self-healing layer is formed on the other side of the substrate layer.
[0039] Based on the above characteristics, the self-healing layer can absorb some of the impact potential energy when the screen protector is subjected to external impact, thereby further reducing the impact on electronic devices and also preventing scratches.
[0040] Thirdly, embodiments of this application also provide a screen protector cover plate, which includes a cover plate body and a screen protector film as described in the first aspect, wherein the screen protector film is located on the surface of the cover plate body, and the hydrogenated graphene thermally conductive layer is located on the side of the substrate layer close to the cover plate body.
[0041] Based on the above characteristics, by setting a screen protection film on the surface of the cover plate body, the impact resistance of the screen protection cover plate can be further improved, which is beneficial to improving the protection of the screen of electronic devices.
[0042] As an example, the edge region of the cover plate body is at least partially curved, and the screen protector is at least attached to the curved edge region of the cover plate body. The screen protector provided in this embodiment improves its impact resistance by utilizing a hydrogenated graphene thermally conductive layer, while still maintaining good bending ability. The screen protector also adheres well to the cover plate body in the edge region. The internal stress of the screen protector is low, making it less prone to separation from the cover plate body.
[0043] Fourthly, embodiments of this application also provide an electronic device, which includes a display panel and a screen protector as described in the first aspect, wherein the screen protector is located on the surface of the display panel and the hydrogenated graphene thermally conductive layer is located on the side of the substrate layer close to the display panel; or, the electronic device includes a display panel and a screen protector cover as described in the third aspect, wherein the screen protector cover is located on the surface of the display panel and the screen protector is located on the side of the cover body away from the display panel.
[0044] Based on the above features, by directly setting a screen protector film on the surface of the display panel, or by setting a screen protector cover with the screen protector film, the display panel can be protected, the impact resistance of electronic devices can be improved, and the screen protection of electronic devices can be enhanced. Attached Figure Description
[0045] Figure 1 This is a structural diagram of a screen protector in related technologies;
[0046] Figure 2 This is a schematic diagram of the screen protector's sliding process;
[0047] Figure 3 This is a schematic diagram of the structure of a screen protector provided in an embodiment of this application;
[0048] Figure 4 This is a schematic diagram of the microstructure of a hydrogenated graphene thermally conductive layer provided in an embodiment of this application;
[0049] Figure 5 This is a schematic diagram of the structure of a screen protector provided in an embodiment of this application;
[0050] Figure 6 This is a schematic diagram of the structure of a screen protector provided in an embodiment of this application;
[0051] Figure 7 This is a schematic diagram of the structure of a screen protector cover provided in an embodiment of this application;
[0052] Figure 8 This is a schematic diagram of the structure of a screen protector cover provided in an embodiment of this application;
[0053] Figure 9 This is a schematic diagram of the structure of a screen protector cover provided in an embodiment of this application;
[0054] Figure 10 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application;
[0055] Figure 11 This is a flowchart illustrating a method for preparing a screen protector according to an embodiment of this application;
[0056] Figure 12 This is a flowchart illustrating a method for preparing a screen protector according to an embodiment of this application;
[0057] Figure 13 This is a schematic diagram of the preparation process of a screen protector provided in an embodiment of this application.
[0058] Legend
[0059] 1000, Screen Protector
[0060] 11. Substrate layer; 12. Hydrogenated graphene thermally conductive layer; 13. Adhesive layer
[0061] 14. Release layer; 15. Self-healing layer; 16. Protective layer; 111. Hydrogenated graphene
[0062] 121. First intermediate liquid; 122. Second intermediate liquid; 123. Hydrogenated graphene mixture
[0063] 2000, Cover plate body 2000a, Central area 2000b, Edge area
[0064] 3000, Display Panel Detailed Implementation
[0065] The terminology used in the embodiments section of this application is for illustrative purposes only and is not intended to limit the application. Unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in the patent application specification and claims of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "a" or "one," and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including," and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. The terms "connected," "linked," and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up," "down," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.
[0066] Figure 1 This is a structural diagram of a screen protector in related technologies, such as... Figure 1 As shown, the screen protector 1000 is adhered to the surface of the screen of an electronic device. The screen protector 1000 is made of a highly viscoelastic polymer material, such as TPU. The modulus of this type of material gradually decreases with increasing temperature, causing the material to soften and its stiffness to decrease. This decrease in stiffness not only weakens its impact resistance but also makes the screen protector 1000 prone to slippage, which is detrimental to screen protection.
[0067] Taking a mobile phone as an example, during use, such as continuous video playback, the phone will continuously generate heat, causing the temperature of the screen protector 1000 to rise. This temperature increase from the phone's heat is sufficient to cause a significant reduction in the modulus of the screen protector 1000, especially noticeable in hot summer weather. At 40℃, the adhesion time of the screen protector 1000 decreases by approximately 30% compared to room temperature (25℃). Tests have shown that in hot summer weather, some screen protectors 1000 can slip by as little as 0.1mm. For example, Figure 2 This is a diagram illustrating the sliding process of the screen protector, as shown below. Figure 2 As shown, during use, when a finger slides along the arrow to the left on the surface of the electronic device, if the screen protector 1000 is hot, the screen protector 1000 may slide a small distance in the same direction.
[0068] Figure 3This is a schematic diagram of the structure of a screen protector provided in an embodiment of this application. Figure 3 As shown, the screen protector includes a substrate layer 11 and a hydrogenated graphene thermal conductive layer 12, with the hydrogenated graphene thermal conductive layer 12 located on one side of the substrate layer 11.
[0069] In this embodiment, hydrogenated graphene refers to graphene material with hydrogen-bonding groups, and is simply called hydrogenated graphene. The hydrogenated graphene thermally conductive layer 12 refers to a film layer made of graphene material with hydrogen-bonding groups.
[0070] As an example, the substrate layer 11 can be a TPU layer.
[0071] In this embodiment, a hydrogenated graphene thermal conductive layer 12 is arranged on one side of the substrate layer 11. The hydrogenated graphene thermal conductive layer 12 has good thermal conductivity. When the electronic device heats up, the hydrogenated graphene thermal conductive layer 12 can accelerate the conduction of heat on the screen surface, accelerate the dispersion of heat, reduce the degree of temperature rise of the screen protective film, and avoid a significant decrease in the modulus of the substrate layer 11. This avoids a significant weakening of the impact resistance of the screen protective film and also helps to prevent significant slippage of the screen protective film.
[0072] Figure 4 This is a schematic diagram of the microstructure of a hydrogenated graphene thermally conductive layer provided in an embodiment of this application. Figure 4 As shown, the surface of the hydrogenated graphene thermal conductive layer 12 has a large number of hydrogen bonds. These hydrogen bonds can break during the impact of external forces on the screen protector, absorbing the energy of the impact and thus reducing the impact of external forces on electronic devices. Furthermore, the hydrogen bonds on the surface of the hydrogenated graphene thermal conductive layer can regenerate and provide damping, improving the damping performance of the screen protector and further suppressing its slippage. This gives the screen protector higher impact resistance and anti-slip capability, enhancing its protective effect on electronic devices.
[0073] A comparative impact resistance test was conducted on electronic devices using screen protectors from related technologies and those using screen protectors of the same thickness as those in this application embodiment. The results showed that the average screen breakage height of the electronic devices increased from 280mm to 320mm, and the average impact kinetic energy they could withstand increased from 549mJ to 627mJ. A comparative test of screen protector slippage also revealed that, under the same temperature and usage conditions, the average slippage of the screen protector in this application embodiment was less than 20% of the average slippage of screen protectors of the same thickness in related technologies.
[0074] In some examples, the thickness of the hydrogenated graphene thermally conductive layer 12 can be no more than 1 μm. The thickness of the hydrogenated graphene thermally conductive layer 12 has a certain impact on its thermal conductivity, mechanical properties, and light transmittance. Setting the thickness of the hydrogenated graphene thermally conductive layer 12 within 1 μm allows its thermal conductivity, mechanical properties, and light transmittance to meet the requirements of most application scenarios.
[0075] As an example, the thickness of the hydrogenated graphene thermal conductive layer 12 is no more than 80 nm.
[0076] When the performance of the hydrogenated graphene thermal conductive layer 12 meets the design requirements, its thickness is typically minimized within the limits of the manufacturing process to avoid an excessively thick overall screen protector. The hydrogenated graphene thermal conductive layer 12 can be prepared using a spray coating process. However, to ensure the structural integrity of the hydrogenated graphene thermal conductive layer 12, spray coating often results in a relatively large thickness, typically around 1 μm, and is prone to uneven thickness, which can negatively impact the display effect of electronic devices. In this embodiment, by setting the thickness of the hydrogenated graphene thermal conductive layer 12 to 80 nm, the total thickness of the screen protector can be reduced, and the screen protector's light transmittance is improved, minimizing the impact on display performance. The specific manufacturing process will be described in detail later.
[0077] In some examples, the thickness of the substrate layer 11 is 60 μm to 120 μm.
[0078] By setting the thickness of the substrate layer 11 within this range, the screen protector provided in this embodiment can have good impact resistance without resulting in an excessively large total thickness. The thickness of the substrate layer 11 accounts for a relatively high proportion of the total thickness of the screen protector, and its thickness has a significant impact on the overall rigidity of the screen protector. Setting the thickness too thin will significantly weaken the screen protector's impact resistance. In this embodiment, since the numerous hydrogen bonds present in the hydrogenated graphene thermally conductive layer 12 can effectively absorb impact and improve the impact resistance of the screen protector, setting the thickness of the substrate layer 11 to 60μm~120μm allows the impact resistance of the screen protector to meet the needs of most everyday use scenarios. For example, the thickness of the substrate layer 11 can be 70μm.
[0079] Figure 5 This is a schematic diagram of the structure of a screen protector provided in an embodiment of this application. Figure 5As shown, in addition to the substrate layer 11 and the hydrogenated graphene thermally conductive layer 12, the screen protector also includes an adhesive layer 13 and a release layer 14. The adhesive layer 13 is located on the side of the hydrogenated graphene thermally conductive layer 12 away from the substrate layer 11, and the release layer 14 is located on the side of the adhesive layer 13 away from the hydrogenated graphene thermally conductive layer 12.
[0080] The adhesive layer 13 is used to attach the screen protector to the electronic device. The release layer 14 is used to protect the adhesive layer 13 and can be removed before attaching the screen protector to the electronic device.
[0081] For example, the adhesive layer 13 can be made of optical adhesive. For instance, it can be made of acrylic adhesive or silicone.
[0082] In some examples, the thickness of the adhesive layer 13 can be 15μm to 30μm to provide sufficient adhesive force without making the screen protector too thick.
[0083] like Figure 5 As shown, the screen protector also includes a self-healing layer 15, which is located on the side of the substrate layer 11 away from the hydrogenated graphene thermal conductive layer 12.
[0084] The self-healing layer 15 has a certain degree of elasticity, which can absorb some of the impact energy when the screen protector is subjected to external impact, thereby further reducing the impact on electronic devices. In addition, the self-healing layer 15 can also prevent scratches, fingerprints, and improve wear resistance.
[0085] In some examples, the self-healing layer 15 may be a polyurethane coating doped with fluoroethers and / or fluorocarbon additives, or a polyurethane acrylic resin coating doped with fluoroethers and / or fluorocarbon additives.
[0086] In this example, the self-healing layer 15 can be made of polyhydroxyurethane acrylate prepolymer.
[0087] like Figure 5 As shown, the screen protector also includes a protective layer 16, which is located on the side of the self-healing layer 15 away from the substrate layer 11.
[0088] Before the screen protector is applied, the protective layer 16 provides protection for the self-healing layer 15. After the screen protector is applied to the electronic device, the protective layer 16 can be removed.
[0089] In other possible implementations, the screen protector may also include other film layers, such as a hardened layer, a blue light blocking layer, etc. These film layers can be selectively disposed between the aforementioned partial film layers as needed.
[0090] Figure 6This is a schematic diagram of the structure of a screen protector provided in an embodiment of this application. Figure 6 As shown, compared to Figure 5 The example shown, Figure 6 In the screen protector shown, the substrate layer 11 is doped with hydrogenated graphene 111. The hydrogenated graphene 111 is encapsulated by the substrate layer 11, and hydrogen bonds on the surface of the hydrogenated graphene 111 can also form a hydrogen bond network with the substrate layer 11, improving the damping performance of the screen protector. The hydrogen bonds can also break and absorb energy during impact, thereby improving the impact resistance of the substrate layer 11. Furthermore, the hydrogenated graphene 111 incorporated into the substrate layer 11 also helps improve the thermal conductivity of the substrate layer 11, further accelerating heat dissipation and preventing significant slippage of the screen protector.
[0091] Figure 7 This is a schematic diagram of the structure of a screen protector cover provided in an embodiment of this application. For example... Figure 7 As shown, the screen protector includes a cover body 2000 and any of the aforementioned screen protector films 1000. The screen protector film 1000 is located on the surface of the cover body 2000. In the screen protector film 1000, the hydrogenated graphene thermally conductive layer 12 is located on the side of the substrate layer 11 near the cover body 2000.
[0092] For example, the cover body 2000 can be a transparent cover, such as a glass cover or a plastic cover.
[0093] In this embodiment of the application, by providing a screen protection film on the surface of the cover body 2000, the impact resistance of the screen protection cover can be further improved, which is beneficial to improving the protection of the screen of electronic devices.
[0094] Furthermore, since the screen protector provided in this application embodiment has good impact resistance, the thickness of the cover body 2000 can be appropriately reduced while ensuring that the overall impact resistance of the screen protector cover meets the design requirements, thereby reducing the overall thickness of the screen protector cover and helping to reduce the thickness of electronic devices.
[0095] In some examples, the cover plate body 2000 can be a flat structure, meaning the surface of the cover plate body 2000 that adheres to the screen protector 1000 is flat. In these examples, the screen protector 1000 adheres well to the surface of the cover plate body 2000.
[0096] Figure 8 This is a schematic diagram of the structure of a screen protector cover provided in an embodiment of this application. For example... Figure 8As shown, in some other examples, the cover body 2000 includes a central region 2000a and an edge region 2000b, the edge region 2000b being located on at least one side of the central region 2000a. Exemplarily, the edge region 2000b may surround the central region 2000a.
[0097] The surface of the central region 2000a that adheres to the screen protector 1000 is flat, while the surface of the edge region 2000b that adheres to the screen protector 1000 is beveled. The screen protector 1000 is bonded to both the central region 2000a and the edge region 2000b, and there is a bend in the screen protector 1000 at the junction of the central region 2000a and the edge region 2000b.
[0098] Figure 9 This is a schematic diagram of the structure of a screen protector cover provided in an embodiment of this application. For example... Figure 9 As shown, in some other examples, the edge region 2000b of the cover body 2000 is at least partially curved, and the screen protector 1000 is at least attached to the curved edge region 2000b of the cover body 2000.
[0099] Compared to Figure 8 The example shown is as follows: Figure 9 As shown, in this example, the surface of the central region 2000a that is in contact with the screen protector 1000 is flat, while the surface of the edge region 2000b that is in contact with the screen protector 1000 is curved. The screen protector 1000 is attached to both the central region 2000a and the edge region 2000b, and in the edge region 2000b, the screen protector 1000 is curved.
[0100] In related technologies, to improve the impact resistance of screen protectors, high-modulus film layers are typically added. For example, a PET layer made of polyethylene terephthalate (PET) can have a modulus of up to 4 GPa, far exceeding the modulus of the TPU material used to make the substrate layer 11. Screen protectors with added PET layers, when adhered to the cover plate body 2000 of a flat panel structure, can provide better protection. However, for… Figure 8 The cover body 2000 in the example shown and Figure 9 In the example shown, the adhesion between the screen protector and the cover body 2000 in the edge region 2000b is poor. Especially for the cover body 2000 where the edge region 2000b is curved, the screen protector easily lifts up and separates from the cover body 2000 during daily use. This is because the PET layer has a relatively high modulus and is not easily bent; after being adhered to the cover body 2000, the PET layer experiences significant stress in the edge region 2000b.
[0101] The screen protector 1000 provided in this embodiment improves its impact resistance by utilizing a hydrogenated graphene thermally conductive layer 12. Unlike related technologies that incorporate a high-modulus film layer, this embodiment does not introduce a high-modulus film layer. The screen protector 1000 still exhibits good bending ability, and it adheres well to the cover plate body 2000 at its edge region 2000b. The screen protector 1000 has low internal stress, making it less prone to separation from the cover plate body 2000.
[0102] Figure 10 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. The electronic device can be, but is not limited to, a mobile phone, tablet computer, PDA, laptop computer, or monitor. For example, the electronic device can be a mobile phone.
[0103] In some examples, the electronic device includes a display panel 3000 and any of the aforementioned screen protectors 1000. The screen protector 1000 is located on the surface of the display panel 3000, and the hydrogenated graphene thermally conductive layer 12 is located on the side of the substrate layer 11 near the display panel 3000.
[0104] In other examples, the electronic device may also include a display panel 3000 and any of the aforementioned screen protectors. The screen protector is located on the surface of the display panel 3000, and the screen protector 1000 is located on the side of the cover body 2000 away from the display panel 3000.
[0105] In this embodiment of the application, by directly setting a screen protector 1000 on the surface of the display panel 3000, or by setting a screen protector cover with the screen protector 1000, the display panel 3000 can be protected, the impact resistance of the electronic device can be improved, and the screen protection of the electronic device can be enhanced.
[0106] In this embodiment, the screen may be the display surface of the display panel 3000, and the display surface may include a display area and a non-display area, with the non-display area located around the display area.
[0107] Figure 11 This is a flowchart illustrating a method for preparing a screen protector according to an embodiment of this application. This method is used to prepare any of the aforementioned screen protectors, for example... Figure 3 or Figure 5 The screen protector shown. (As shown) Figure 11 As shown, the preparation method includes:
[0108] In step S110, a substrate layer 11 is provided.
[0109] The substrate layer 11 can be provided by purchasing it from outside, or it can be obtained by processing it after purchasing it from outside, or it can be prepared from raw materials.
[0110] In step S112, a hydrogenated graphene thermally conductive layer 12 is formed on one side of the substrate layer 11.
[0111] In this embodiment, a hydrogenated graphene thermal conductive layer 12 is formed on one side of the substrate layer 11. The hydrogenated graphene thermal conductive layer 12 has good thermal conductivity. When the electronic device heats up, the hydrogenated graphene thermal conductive layer 12 can accelerate the conduction of heat on the screen surface, accelerate the dispersion of heat, reduce the degree of temperature rise of the screen protector, and avoid a significant decrease in the modulus of the substrate layer 11. This avoids a significant weakening of the impact resistance of the screen protector and also helps to prevent significant slippage of the screen protector.
[0112] Furthermore, because the surface of the hydrogenated graphene thermally conductive layer 12 has a large number of hydrogen bonds, these hydrogen bonds can break during the impact of external forces on the screen protector, absorbing the energy of the impact and thus reducing the impact of external forces on electronic devices. Moreover, the hydrogen bonds can regenerate and provide damping, improving the damping performance of the screen protector and further suppressing its slippage. This gives the screen protector higher impact and anti-slip capabilities, enhancing its protective effect on electronic devices.
[0113] Figure 12 This is a flowchart illustrating a method for preparing a screen protector according to an embodiment of this application. This method can be used to prepare... Figure 5 The screen protector shown below is combined with... Figure 5 and Figure 12 The preparation method is described below. Figure 12 As shown, the preparation method includes:
[0114] In step S210, substrate layer 11 is prepared.
[0115] For example, the substrate layer 11 can be prepared using a casting process.
[0116] Casting is a film production process in which the raw material is first plasticized and melted by an extruder and then extruded into a sheet shape and cast onto the surface of a steadily rotating cooling roller, where the film is cooled and shaped.
[0117] The substrate layer 11 can be made of a high viscoelastic polymer material, such as TPU.
[0118] After step S210, the substrate layer 11 can be pretreated to form polar groups on the surface of the substrate layer 11 used to form the hydrogenated graphene thermally conductive layer 12.
[0119] The polar groups can form a spatially entangled network and a dense hydrogen bond network with the subsequently formed hydrogenated graphene thermally conductive layer 12, thereby improving the damping performance of the screen protector and slowing down the slippage of the screen protector.
[0120] As an example, the pretreatment of the substrate layer 11 may include the following steps S212 and S214.
[0121] In step S212, the substrate layer 11 is subjected to irradiation treatment.
[0122] Irradiation treatment is the process of treating materials by irradiation.
[0123] For example, the surface of the substrate layer 11 can be irradiated with a low-pulse laser. For example, a laser with a wavelength of 355 nm.
[0124] The surface of the substrate layer 11 subjected to irradiation treatment can be the surface used to form the hydrogenated graphene thermally conductive layer 12 in subsequent steps. Irradiation treatment can stimulate the molecular chains on the surface of the substrate layer 11 to break, forming a large number of micro-defects, which helps to increase the number of polar groups formed on the surface of the substrate layer 11.
[0125] In step S214, polar groups are formed on the surface of the substrate layer 11 by corona treatment or plasma cleaning.
[0126] By irradiating the substrate layer 11 and then subjecting it to corona treatment or plasma cleaning, the molecular chains of the substrate layer 11 can provide a large number of hydrogen bond acceptors such as N and O, which helps to form a dense hydrogen bond network.
[0127] In step S216, an amino compound is added to the graphene oxide mixture and then ultrasonically treated to obtain the first intermediate liquid 121.
[0128] A graphene oxide mixture can be obtained by diluting a graphene oxide slurry. For example, the graphene oxide slurry can be diluted with pure water to 1 mg / ml.
[0129] As an example, the amino compound may include one or more of aminotriazine and aminotriazole. The amount of amino compound added may be trace, i.e., the content may be from one part per million to one part per ten thousand; for example, the content of the amino compound in the graphene oxide mixture may be from one part per million to one part per ten thousand. The ultrasonic treatment temperature may be 80°C.
[0130] In some examples, trace amounts of 1-ethyl-(3-dimethylaminopropyl)carbodiimide may also be added to the graphene oxide mixture.
[0131] In step S218, the first intermediate liquid 121 is centrifuged and separated into layers to obtain the second intermediate liquid 122.
[0132] Figure 13 This is a schematic diagram illustrating the manufacturing process of a screen protector provided in an embodiment of this application, as shown below. Figure 13 As shown, after centrifugation and separation, the first intermediate liquid 121 yields the second intermediate liquid 122.
[0133] The first intermediate liquid 121 obtained after ultrasonic treatment contains a mixture of small-molecule graphene, hydrogenated graphene, and multilayered graphene. By centrifuging and separating the first intermediate liquid 121, these three graphene structures can be separated, making it easier to obtain relatively pure ultrathin hydrogenated graphene for the preparation of the hydrogenated graphene thermal conductive layer 12.
[0134] In step S220, the intermediate layer of the second intermediate liquid 122 is extracted to obtain hydrogenated graphene mixture 123.
[0135] like Figure 13 As shown, after centrifugation and separation of the second intermediate liquid 121, the mixture roughly separates into three layers. Small-molecule graphene is mainly distributed in the upper layer, hydrogenated graphene is mainly distributed in the middle layer, and multilayered graphene is mainly distributed in the lower layer. By extracting the middle layer of the second intermediate liquid 122, a relatively pure hydrogenated graphene mixture can be obtained, with less small-molecule graphene and multilayered graphene mixed in.
[0136] Steps S216 to S220 yield a hydrogenated graphene mixture 123 for preparing the hydrogenated graphene thermally conductive layer 12. The process of preparing the hydrogenated graphene mixture 123 is independent of the aforementioned steps S210 to S214. Therefore, the preparation of the hydrogenated graphene mixture 123 can be performed before or after any of the steps S210 to S214, for example, it can be performed before step S210, i.e., during the preparation of the substrate layer 11.
[0137] In step S222, a hydrogenated graphene mixture is formed on one side of the substrate layer 11.
[0138] For example, such as Figure 13 As shown, the hydrogenated graphene mixture 123 obtained in step S220 can be poured onto one side of the substrate layer 11. Alternatively, one side of the substrate layer 11 can be immersed in the hydrogenated graphene mixture 123 and then removed.
[0139] Both methods enable the hydrogenated graphene mixture 123 to adhere to an entire surface of the substrate layer, which is beneficial for forming a complete hydrogenated graphene thermally conductive layer.
[0140] The hydrogenated graphene mixture can be poured onto the surface of the substrate layer 11 where polar groups are formed, i.e., the surface of the substrate layer 11 that has been irradiated in arrangement S212.
[0141] During the process of pouring the hydrogenated graphene mixture onto the surface of the substrate layer 11, the hydrogenated graphene is dispersed onto the surface of the substrate layer 11.
[0142] In step S224, the hydrogenated graphene mixture on the surface of the substrate layer 11 is dried to form a hydrogenated graphene thermally conductive layer 12.
[0143] By drying, the moisture on the surface of the substrate layer 11 is removed, allowing the hydrogenated graphene in the hydrogenated graphene mixture to remain on the surface of the substrate layer 11, forming a flexible two-dimensional network structure. The hydrogenated graphene binds to hydrogen bond acceptors on the surface of the substrate layer 11, forming a dense hydrogen bond network.
[0144] like Figure 13 As shown, after step S224, the process can return to step S222, meaning that steps S222 and S224 can be repeated multiple times, for example, 3 to 5 times. This is because if the hydrogenated graphene mixture is poured onto the surface of the substrate layer 11 only once and then dried, the resulting hydrogenated graphene thermal conductive layer 12 may be too thin, with incomplete local areas, and may not completely cover the surface of the substrate layer 11. By repeating the process multiple times, the hydrogenated graphene can be evenly dispersed on the surface of the substrate layer 11, resulting in a more complete structure for the hydrogenated graphene thermal conductive layer 12, which can completely cover the irradiated surface of the substrate layer 11.
[0145] The method for preparing the hydrogenated graphene thermally conductive layer 12 in steps S222 and S224 can prepare a structurally complete and thin hydrogenated graphene thermally conductive layer 12 on the surface of the substrate layer 11. For example, the thickness of the prepared hydrogenated graphene thermally conductive layer 12 can be 80 nm.
[0146] In step S226, the substrate layer 11 on which the hydrogenated graphene thermally conductive layer 12 is formed is freeze-dried.
[0147] Freeze-drying is a drying process that involves freezing water-containing materials below their freezing point, turning the water into ice, and then removing the ice by turning it into vapor in a negative pressure environment.
[0148] In this example, the substrate layer 11 on which the hydrogenated graphene thermal conductive layer 12 is formed is first cooled to solidify the residual moisture, and then the ice is sublimated into a gaseous state in a negative pressure environment.
[0149] Freeze-drying can remove residual water molecules inside the hydrogenated graphene thermal conductive layer 12 without damaging the two-dimensional structure of graphene, which helps to improve the thermal diffusion performance of the hydrogenated graphene thermal conductive layer 12.
[0150] In step S228, a self-healing layer 15 is formed on the side of the substrate layer 11 away from the hydrogenated graphene thermal conductive layer 12.
[0151] The self-healing layer 15 can generate lateral stress transmission when the screen protector is subjected to external impact, disperse the force over a larger area, absorb some of the impact potential energy, reduce the impact on electronic devices, and also play a role in preventing scratches, preventing fingerprints, and improving wear resistance.
[0152] In some examples, the polyhydroxy urethane acrylate prepolymer can be mixed with a small amount of leveling agent, then a curing agent can be added, and after stirring evenly, it can be coated on the side of the substrate layer 11 away from the hydrogenated graphene thermally conductive layer 12 and dried.
[0153] For example, the curing agent may be hexamethylene diisocyanate.
[0154] Adding a leveling agent can improve the surface smoothness and thickness uniformity of the self-healing layer 15.
[0155] After step S228, an adhesive layer 13 may be formed on the surface of the hydrogenated graphene thermally conductive layer 12 away from the substrate layer 11. For example, an acrylic adhesive or silicone adhesive may be applied by slot coating to form the adhesive layer 13.
[0156] After the adhesive layer 13 is formed, a release layer 14 can be arranged on the side of the adhesive layer 13 away from the hydrogenated graphene thermal conductive layer 12 to protect the adhesive layer 13.
[0157] The above description is merely one embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A screen protector, characterized in that, The system includes a substrate layer (11) and a hydrogenated graphene thermally conductive layer (12), wherein the hydrogenated graphene thermally conductive layer (12) is located on one side of the substrate layer (11); the substrate layer (11) is doped with hydrogenated graphene (111); the thickness of the hydrogenated graphene thermally conductive layer (12) is no more than 80 nm; the hydrogenated graphene thermally conductive layer (12) is a flexible two-dimensional network structure; the hydrogenated graphene thermally conductive layer (12) is formed from a hydrogenated graphene mixture, wherein the hydrogenated graphene mixture is formed by adding an amino compound to a graphene oxide mixture and then ultrasonically treating it. After centrifugation and layering, the intermediate layer is extracted to obtain the hydrogenated graphene thermal conductive layer (12). The hydrogenated graphene is uniformly dispersed on the surface of the substrate layer (11) by repeating the following process 3 to 5 times: pour the hydrogenated graphene mixture (123) onto one side of the substrate layer (11) and then dry the hydrogenated graphene mixture on the surface of the substrate layer (11), or immerse one side of the substrate layer (11) into the hydrogenated graphene mixture (123) and take it out, and then dry the hydrogenated graphene mixture on the surface of the substrate layer (11). The substrate layer (11) on which the hydrogenated graphene thermal conductive layer (12) is formed is freeze-dried. The surface of the substrate layer (11) near the surface of the hydrogenated graphene thermal conductive layer (12) has polar groups, and the surface of the hydrogenated graphene thermal conductive layer (12) near the surface of the substrate layer (11) has hydrogen bonds. The polar groups and the hydrogen bonds form a hydrogen bond network.
2. The screen protector according to claim 1, characterized in that, The thickness of the substrate layer (11) is 60μm~120μm.
3. The screen protector according to claim 1, characterized in that, It also includes an adhesive layer (13) and a release layer (14), wherein the adhesive layer (13) is located on the side of the hydrogenated graphene thermally conductive layer (12) away from the substrate layer (11), and the release layer (14) is located on the side of the adhesive layer (13) away from the hydrogenated graphene thermally conductive layer (12).
4. The screen protector according to any one of claims 1 to 3, characterized in that, It also includes a self-healing layer (15) located on the other side of the substrate layer (11).
5. The screen protector according to claim 4, characterized in that, It also includes a protective layer (16) located on the side of the self-healing layer (15) away from the substrate layer (11).
6. A method for preparing a screen protector, characterized in that, include: The substrate layer (11) is pretreated to form polar groups on the surface of the substrate layer (11) for forming the hydrogenated graphene thermal conductive layer (12), wherein the substrate layer (11) is doped with hydrogenated graphene (111). An amino compound was added to the graphene oxide mixture and then ultrasonically treated to obtain the first intermediate liquid (121). The first intermediate liquid was centrifuged and separated to obtain the second intermediate liquid (122). The intermediate layer of the second intermediate liquid (122) is extracted to obtain a hydrogenated graphene mixture (123). Repeat the following process 3 to 5 times to uniformly disperse the hydrogenated graphene on the surface of the substrate layer (11) to form a hydrogenated graphene thermal conductive layer (12): pour the hydrogenated graphene mixture (123) onto one side of the substrate layer (11) and then dry the hydrogenated graphene mixture on the surface of the substrate layer (11), or immerse one side of the substrate layer (11) in the hydrogenated graphene mixture (123) and take it out, and then dry the hydrogenated graphene mixture on the surface of the substrate layer (11). The substrate layer (11) with the hydrogenated graphene thermally conductive layer (12) formed is freeze-dried; The thickness of the hydrogenated graphene thermal conductive layer (12) is no more than 80 nm. The hydrogenated graphene thermal conductive layer (12) is a flexible two-dimensional network structure. The surface of the hydrogenated graphene thermal conductive layer (12) near the substrate layer (11) has hydrogen bonds. The polar groups and the hydrogen bonds form a hydrogen bond network.
7. The preparation method according to claim 6, characterized in that, The pretreatment of the substrate layer (11) includes: The substrate layer (11) is subjected to irradiation treatment; Polar groups are formed on the surface of the substrate layer (11) by corona treatment or plasma cleaning.
8. The preparation method according to claim 6 or 7, characterized in that, After drying the hydrogenated graphene mixture on the surface of the substrate layer (11) to form the hydrogenated graphene thermally conductive layer (12), the method further includes: A self-healing layer (15) is formed on the other side of the substrate layer (11).
9. A screen protector cover, characterized in that, It includes a cover plate body (2000) and a screen protector (1000) as described in any one of claims 1 to 5, wherein the screen protector (1000) is located on the surface of the cover plate body (2000), and the hydrogenated graphene thermal conductive layer (12) is located on the side of the substrate layer (11) close to the cover plate body (2000).
10. The screen protector cover according to claim 9, characterized in that, The edge region (2000b) of the cover plate body (2000) is at least partially curved, and the screen protector (1000) is at least attached to the curved edge region (2000b) of the cover plate body (2000).
11. An electronic device, characterized in that, The device includes a display panel (3000) and a screen protector as described in any one of claims 1 to 5, wherein the screen protector is located on the surface of the display panel (3000) and the hydrogenated graphene thermal conductive layer (12) is located on the side of the substrate layer (11) close to the display panel (3000); or, the device includes a display panel (3000) and a screen protector cover as described in claim 9 or 10, wherein the screen protector cover is located on the surface of the display panel (3000) and the screen protector (1000) is located on the side of the cover body (2000) away from the display panel (3000).