Screen protection film and terminal

Abstract

According to the screen protection film and the terminal provided by the embodiment of the invention, by using the screen protection film, the temperature rise of the terminal caused by solar radiation can be reduced, the temperature of the terminal is reduced, the terminal runs more smoothly, and the possibility of generating a thermal safety problem is reduced. The screen protection film is used for being arranged on the outer side of a terminal screen and comprises a radiation refrigeration layer which comprises a first substrate, a second substrate, a plurality of first polymer layers and a plurality of second polymer layers, and the first polymer layers and the second polymer layers are located between the first substrate and the second substrate; the multiple first polymer layers and the multiple second polymer layers are alternately stacked, and the radiation refrigeration layer is used for reflecting at least part of infrared rays and transmitting visible light; the radiation refrigeration layer is a flexible layer; the surface hardening layer is located on the side, away from the terminal screen, of the radiation refrigeration layer and used for increasing the surface hardness of the screen protection film; wherein the refractive index of the first polymer layer is higher than that of the second polymer layer.

Description

Technical Field

[0001] This application relates to the technical field of electronic devices, and in particular, to a screen protector and a terminal. Background Art

[0002] With the development of technology, electronic devices such as mobile phones have gradually become indispensable electronic products in people's lives. Their stability and reliability have also become the focus of people's attention.

[0003] However, when using a mobile phone outdoors in summer, due to solar radiation and heat generated by internal chips, the mobile phone gets severely heated, which can cause problems such as lag and shutdown. In severe cases, it can even cause thermal safety problems (including burns, battery explosions, etc.). This problem is a pain point in the industry, and current thermal management materials are difficult to solve this problem. Summary of the Utility Model

[0004] To solve the above technical problems, this application provides a screen protector and a terminal, which can reduce the temperature rise of the terminal caused by solar radiation, lower the terminal temperature, make the terminal run more smoothly, and reduce the possibility of thermal safety problems.

[0005] In a first aspect, an embodiment of this application provides a screen protector for being disposed outside a terminal screen, including: a radiative cooling layer, including a first substrate, a second substrate, multiple first polymer layers, and multiple second polymer layers, the multiple first polymer layers and the multiple second polymer layers are located between the first substrate and the second substrate, the multiple first polymer layers and the multiple second polymer layers are alternately stacked, the radiative cooling layer is configured to reflect at least part of infrared rays and transmit visible light; the radiative cooling layer is a flexible layer; a surface hardening layer, located on a side of the radiative cooling layer away from the terminal screen, for increasing the surface hardness of the screen protector. Wherein, the refractive index of the first polymer layer is higher than that of the second polymer layer.

[0006] The radiative cooling layer can reflect part of the infrared light and transmit visible light. Therefore, without affecting the normal viewing of the screen, at least part of the infrared light carrying a large amount of heat can be blocked. Avoiding the infrared light irradiating the mobile phone screen to generate heat, thereby suppressing the temperature rise of the mobile phone under solar radiation. And, since the radiative cooling layer is a flexible layer. This characteristic lays the foundation for forming a flexible screen protector for protecting the bendable terminal screen.

[0007] In some possible implementation manners, the material of the first substrate is at least one of polyethylene terephthalate (PET), polyethylene (PE), and polyimide (PI); the material of the second substrate is at least one of polyethylene terephthalate (PET), polyethylene (PE), and polyimide (PI). The materials of the first substrate and the second substrate are polymers, which have good bendable performance and good light transmittance.

[0008] In some possible implementations, the material of the first polymer layer is at least one of fluoropolymer, polyethylene naphthalate (PEN), polyethylene terephthalate (PET), CoPMMA, polypropylene (PP), polyethylene (PE), polyethylene copolymer, PMMA, acrylate copolymer, and polyurethane; the material of the second polymer layer is at least one of fluoropolymer, polyethylene naphthalate (PEN), polyethylene terephthalate (PET), CoPMMA, polypropylene (PP), polyethylene (PE), polyethylene copolymer, PMMA, acrylate copolymer, and polyurethane. The materials of the first substrate and the second substrate are polymers, which have good bendability and good light transmittance, and the refractive index span of the above materials is large, and the optional refractive index is relatively wide.

[0009] In some possible implementations, the refractive index of the first polymer layer is 1.45 to 1.65, the refractive index of the second polymer layer is 1.4 to 1.6, and the refractive index of the first polymer layer is at least 0.05 higher than that of the second polymer layer. This can make the ability of the radiative cooling layer to reflect infrared rays relatively excellent.

[0010] In some possible implementations, the single-layer thickness of the first polymer layer is 20 - 200 nanometers, the single-layer thickness of the second polymer layer is 20 - 200 nanometers, the total thickness of the multiple first polymer layers and the multiple second polymer layers is 30 - 150 micrometers, and the multiple first polymer layers and the multiple second polymer layers total 50 - 1000 layers. This can make the ability of the radiative cooling layer to reflect infrared rays relatively excellent.

[0011] In some possible implementations, the radiative cooling layer is manufactured by nano - lamination. This can make the ability of the radiative cooling layer to reflect infrared rays relatively excellent, and the radiative cooling layer has good bendability.

[0012] In some possible implementations, the material of the surface hardening layer includes at least one of urethane acrylate, epoxy acrylate, polyester acrylate, and pure acrylate; the thickness of the surface hardening layer is 2 - 20 micrometers. This makes the surface hardening layer relatively hard.

[0013] In some possible implementations, it further includes an anti - reflection and light - transmission enhancement compensation layer, which is the layer of the screen protector farthest from the terminal screen. The anti - reflection and light - transmission enhancement compensation layer includes at least one first refractive index layer and at least one second refractive index layer. The refractive index of the first refractive index layer is higher than that of the second refractive index layer. The anti - reflection and light - transmission enhancement compensation layer is used to reduce the reflection of visible light of the screen protector, increase the transmission of visible light of the screen protector, and is used to compensate for the color shift that occurs when visible light passes through the radiative cooling layer. It can compensate for the color shift phenomenon while enhancing light transmission and reducing reflection.

[0014] In some possible implementation manners, the antireflection and antireflection compensation layer includes at least two first refractive index layers and at least two second refractive index layers, and the first refractive index layers and the second refractive index layers are alternately stacked. The structure is simple and easy to implement.

[0015] In some possible implementation manners, the thickness of the antireflection and antireflection compensation layer is 100 - 400 nanometers, the refractive index of the first refractive index layer is 1.6 - 2.4, the refractive index of the second refractive index layer is 1.3 - 1.5, the material of the first refractive index layer is titanium dioxide, niobium pentoxide, zirconium dioxide, titanium pentoxide or fluoric acid, and the material of the second refractive index layer is silicon dioxide, aluminum oxide, magnesium fluoride, silicon carbide or silicon monoxide. Such a setting method can enable the antireflection and antireflection compensation layer to have better optical performance.

[0016] In some possible implementation manners, a substrate layer is further included. The introduction of the substrate layer can reduce the mechanical property requirements of the radiative cooling layer.

[0017] In some possible implementation manners, the material of the substrate layer is a flexible material or a rigid material.

[0018] In some possible implementation manners, the flexible material includes polyethylene terephthalate or polyethylene, and the rigid material includes tempered glass.

[0019] In some possible implementation manners, an intermediate adhesive layer is further included, and the intermediate adhesive layer is used to bond the radiative cooling layer and the substrate layer.

[0020] In some possible implementation manners, a screen adhesive layer is further included, and the screen adhesive layer is used to bond the screen protection film to the outer surface of the terminal screen.

[0021] In some possible implementation manners, the thickness of the screen adhesive layer is 20 - 30 microns, and the material of the screen adhesive layer is an acrylic system material or an organosilicon system material. Such a setting can enable the screen adhesive layer to have better adhesiveness.

[0022] In a second aspect, an embodiment of the present application further provides a terminal, and the above-mentioned any one of the screen protection films is provided on the outer side of the screen. It has the corresponding beneficial effects of the above-mentioned screen protection film. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of a foldable terminal provided by an embodiment of the present application;

[0024] Figure 2 It is a schematic structural diagram of another foldable terminal provided by an embodiment of the present application;

[0025] Figure 3 It is a schematic structural diagram of a straight plate terminal provided by an embodiment of the present application;

[0026] Figure 4 It is a schematic structural diagram of a screen protector;

[0027] Figure 5 It is a schematic structural diagram of a radiative cooling layer provided by an embodiment of the present application;

[0028] Figure 6 It is a comparison chart of the transmittance difference between a radiative cooling layer and a conventional material provided by an embodiment of the present application;

[0029] Figure 7 It is a schematic structural diagram of a surface hardening layer provided by an embodiment of the present application;

[0030] Figure 8 It is a schematic structural diagram of an antireflection and antireflection compensation layer provided by an embodiment of the present application;

[0031] Figure 9 It is a schematic structural diagram of a substrate layer provided by an embodiment of the present application;

[0032] Figure 10 It is a schematic structural diagram of a screen protector provided by an embodiment of the present application;

[0033] Figure 11 It is a schematic structural diagram of another screen protector provided by an embodiment of the present application;

[0034] Figure 12 It is a schematic structural diagram of yet another screen protector provided by an embodiment of the present application;

[0035] Figure 13 It is a schematic structural diagram of still another screen protector provided by an embodiment of the present application. Detailed implementation manners

[0036] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present application.

[0037] The term "and / or" in this article is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0038] The terms such as "upper", "lower", "left", and "right" used in this document are only for clearly explaining the embodiments to describe a possible placement or arrangement form of each component. They are not intended to limit the relationship between components or the setting direction.

[0039] The terms "first" and "second" in the description and claims of the embodiments of this application are used to distinguish different objects, rather than to describe a specific order of the objects. For example, the first target object and the second target object are used to distinguish different target objects, rather than to describe a specific order of the target objects.

[0040] In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplary" or "for example" is intended to present relevant concepts in a specific manner.

[0041] In the description of the embodiments of this application, unless otherwise specified, the meaning of "a plurality of" refers to two or more. For example, a plurality of processing units refers to two or more processing units; a plurality of systems refers to two or more systems.

[0042] The embodiments of this application provide a terminal. The terminal provided by the embodiments of this application can be a mobile phone, a tablet computer, a personal digital assistant (PDA for short), an in-vehicle computer, a television, a smart wearable device, a smart home device, etc. The embodiments of this application do not make special limitations on the specific form of the above terminal. For the convenience of description below, the folded mobile phone and the straight mobile phone are taken as examples for illustration respectively.

[0043] Figure 1 The structure diagram of a folded terminal provided by the embodiments of this application is shown in Figure 1 . As Figure 1 shown, the folded mobile phone 0100 includes a first display unit (also called a folding screen or a flexible screen) 011.

[0044] The first display unit 011 is, for example, a flexible display screen. The first display unit 011 includes, for example, an Organic Light Emitting Diode (OLED) display screen. The OLED display screen does not require a backlight module, and the substrate in the OLED display screen can be made of a flexible resin material, such as Polyethylene terephthalate (PET), so that the OLED display screen has the characteristic of being bendable. Of course, the type of the first display unit 011 includes but is not limited to the OLED display screen. As long as the display screen can be bent, it is within the protection scope of this application. For example, it can also be a Liquid Crystal Display (LCD) screen, an LED display screen (such as including a Micro-LED display screen, a Mini-LED display screen), etc.

[0045] Continuing to refer to Figure 1 , the foldable mobile phone 0100 further includes a structural component. The structural component includes a first body 021, a second body 031, and a rotating shaft structure 041. Along the X-axis direction, the first body 021 and the second body 031 are located on both sides of the rotating shaft structure 041, and the rotating shaft structure 041 is respectively connected to the first body 021 and the second body 031. The first body 021, the rotating shaft structure 041, and the second body 031 can be used to carry the first display unit 011. The first body 021 and the second body 031 can respectively rotate around the axis S0 of the rotating shaft structure 041 to realize states such as folding or unfolding of the first display unit 011, that is, to realize states such as folding or unfolding of the foldable mobile phone 100.

[0046] It should be noted that Figure 1 the description is made by taking the foldable mobile phone 0100 as an example of folding longitudinally, that is, the foldable mobile phone 0100 forms two screens on the left and right when folded, but it does not limit this application. In other alternative embodiments of this application, Figure 2 is a schematic structural diagram of another foldable terminal provided by an embodiment of this application. Refer to Figure 2 . As Figure 2 shown, the foldable mobile phone 0100 can also be folded horizontally, that is, the foldable mobile phone 0100 forms two screens on the top and bottom when folded.

[0047] Figure 3 is a schematic structural diagram of a straight plate terminal provided by an embodiment of this application. Refer to Figure 3 . As Figure 3 shown, the straight plate mobile phone 0200 includes a display panel 012, a middle frame 022, and a rear shell 032. The rear shell 032 and the display panel 012 are oppositely arranged, and the middle frame 022 is located between the rear shell 032 and the display panel 012.

[0048] The middle frame 022, the rear shell 032, and the display screen can enclose an accommodation cavity. Structures such as a main board, a battery, and a retaining wall (not shown in the figure) for fixing the battery are provided in the accommodation cavity. A processor and a memory are provided on the main board. The memory is used to store computer program code. The computer program code includes computer instructions. The processor is used to call the computer instructions to enable the straight mobile phone 0200 to perform corresponding operations.

[0049] The material of the rear shell 032 can include, for example, opaque materials such as plastic, leatherette, and glass fiber; it can also include light-transmitting materials such as glass. The embodiments of the present application do not limit the material of the rear shell 032.

[0050] The display panel 012 includes, for example, a liquid crystal display (LCD) panel, an organic light emitting diode (OLED) display panel, and an LED display panel, etc. Among them, the LED display panel includes, for example, a Micro-LED display panel, a Mini-LED display panel, etc. The embodiments of the present application do not limit the type of the display panel 012.

[0051] Assembling the display panel in the above text with other components can form a mobile phone screen to display the pictures that the mobile phone needs to display.

[0052] In order to prevent the mobile phone screen from being scratched during daily use, a screen protection film can be attached to the outside of the screen to protect the screen from being scratched by foreign objects. If the screen protection film is scratched during use, a new screen protection film can be reattached to reduce the losses caused by scratches. Figure 4 For a schematic structural diagram of a screen protection film, see Figure 4 The screen protection film includes a substrate layer 01 and an adhesive layer 02. Both the substrate layer 01 and the adhesive layer 02 are transparent materials. The adhesive layer 02 bonds the substrate layer 01 to the mobile phone screen. In this way, the mobile phone screen is protected from being scratched. However, when the mobile phone with the above screen protection film is exposed to strong sunlight, since a large amount of infrared light is contained in sunlight, these infrared rays will be converted into heat when irradiated on the mobile phone screen, increasing the temperature of the mobile phone. An excessively high mobile phone temperature will cause the mobile phone chip to downclock, which will in turn cause problems such as lag and shutdown, and seriously, it will also cause thermal safety problems.

[0053] Based on this, an embodiment of the present utility model provides a screen protection film 100. Figure 5 For a schematic structural diagram of a radiative cooling layer provided by an embodiment of the present application, see Figure 5。The screen protection film 100 includes a radiative cooling layer 10. The radiative cooling layer 10 includes a first substrate 11 and a second substrate 12, and a first polymer layer 13 and a second polymer layer 14 which are alternately stacked between the first substrate 11 and the second substrate 12, wherein the refractive index of the first polymer layer 13 is higher than that of the second polymer layer 14. The materials of the first substrate 11 and the second substrate 12 can be any polymer that can be penetrated by visible light. For example, it can be one or more of polyethylene terephthalate (PET), polyethylene (PE), and polyimide (PI). The materials of the first polymer layer 13 and the second polymer layer 14 can be selected from any polymer material that meets the requirements. For example, the materials of the first polymer layer 13 and the second polymer layer 14 can be one or more of fluorine-containing polymers, polyethylene naphthalate (PEN), polyethylene terephthalate (PET), CoPMMA, polypropylene (PP), polyethylene (PE), polyethylene copolymers, PMMA, acrylate copolymers, and polyurethanes. The materials of the first substrate 11, the second substrate 12, the first polymer layer 13, and the second polymer layer 14 in the radiative cooling layer 10 can all be polymer materials. Therefore, the materials in the radiative cooling layer can all be flexible materials, and the radiative cooling layer is a bendable flexible layer.

[0054] The working principle of the radiative cooling layer 10 is that when light such as visible light and infrared light enters the radiative cooling layer 10, it will be reflected when passing through the high-refractive-index first polymer layer 13 and reaching the interface between the high-refractive-index first polymer layer 13 and the low-refractive-index second polymer layer 14, and then refracted into the next first polymer layer 13. When light enters from one medium into another, the smaller the incident angle, the smaller the refraction angle. According to Snell's law, when the refraction angle is equal to 90 degrees, there is a critical angle, and at this time, total reflection occurs. Since the refraction angles of light with different wavelengths are different, after multiple interface reflections and refractions of light, the refraction angles of light with different wavelengths are significantly different. Therefore, the refraction angle of light in a specific frequency band (i.e., electromagnetic wave) can be made close to the critical angle, greatly increasing the reflectivity of light in this frequency band. In addition, light interference also occurs in the radiative cooling layer 10, thereby enhancing or weakening the light with corresponding phases. Figure 6 This is a comparison chart of the transmittance differences between the radiative cooling layer provided in the embodiment of the present application and conventional materials. See Figure 6Using the above principle, by controlling parameters such as the refractive indices of the first polymer layer 13 and the second polymer layer 14, and the single-layer thicknesses of the first polymer layer 13 and the second polymer layer 14, the radiative cooling layer 10 can be designed such that during the process of light in different frequency bands passing through the radiative cooling layer 10, at least part of the infrared spectral light undergoes high-reflectivity reflection, while the visible spectral light undergoes low-reflectivity reflection. In this way, the selective passage of light in different frequency bands is achieved, greatly reducing the transmittance of infrared spectral light while ensuring that visible light can normally pass through the radiative cooling layer 10. In this way, the infrared light that irradiates the mobile phone screen and causes the mobile phone to heat up cannot irradiate the mobile phone. At the same time, the mobile phone screen can display content normally without affecting the use of the mobile phone.

[0055] To implement the above working principle, the refractive indices, single-layer thicknesses, number of layers, etc. of the first polymer layer 13 and the second polymer layer 14 can be adjusted according to actual needs. Exemplarily, the refractive index of the first polymer layer 13 with a high refractive index can be determined to be 1.45 - 1.65, the refractive index of the second polymer layer 14 with a low refractive index can be determined to be 1.4 - 1.6, and the refractive index of the first polymer layer 13 is at least 0.05 higher than that of the second polymer layer 14. The single-layer thicknesses of the first polymer layer 13 and the second polymer layer 14 can be determined to be 20 - 200 nanometers (nm), the sum of the total thicknesses of the multiple first polymer layers 13 and the multiple second polymer layers 14 can be determined to be 30 - 150 micrometers (μm), and the sum of the total number of layers of the multiple first polymer layers 13 and the multiple second polymer layers 14 can be determined to be 50 - 1000 layers, for example, it can be 200 - 500 layers. Such settings can make the visible light transmittance of the radiative cooling layer 10 greater than 90%, and the near-infrared reflectivity greater than 15%. In addition, due to the advantage that the polymer has a low communication signal blocking rate, the emissivity of the whole machine attached to the radiative cooling layer 10 is greater than 75%. Due to the advantage that the polymer has good ductility, the screen protector 100 provided with the radiative cooling layer 10 can be a flexible film. The radiative cooling layer 10 can be obtained by means of nano-lamination.

[0056] Figure 7 The following is a schematic structural diagram of a surface hardening layer provided by an embodiment of the present application. Refer to Figure 7。The screen protector 100 may further include a surface hardening layer 20, which may be located at the top layer or the second top layer closest to the outside of the screen protector 100. The material of the surface hardening layer 20 can be determined according to actual needs. For example, it can be one or more of polyurethane acrylate, epoxy acrylate, polyester acrylate, and pure acrylate. These materials are coated on the surface of the film layer to form a thin film with a certain thickness. Exemplarily, the thickness of the surface hardening layer 20 can be 2-20 μm. The thin film prepared in this way can meet the wear resistance requirements of an adhesion greater than 4B, a steel wool friction greater than 1000 times, and a hardness ≥ 1H. The surface hardening layer 20 can enhance the wear resistance and scratch resistance of the screen protector 100, and to a certain extent, prevent the screen protector 100 from being scratched.

[0057] Figure 8 Schematic diagram of the structure of an antireflection and light enhancement compensation layer provided by an embodiment of the present application. Refer to Figure 8 。The screen protector 100 may further include an antireflection and light enhancement compensation layer 30, which is the film layer farthest from the mobile phone screen and is located at the top layer closest to the outside of the screen protector 100. The antireflection and light enhancement compensation layer 30 includes at least one first refractive index layer 31 and at least one second refractive index layer 32, and the refractive index of the first refractive index layer 31 is higher than that of the second refractive index layer 32. If both the first refractive index layer 31 and the second refractive index layer 32 are more than two layers, they are alternately stacked. The purpose of this setting is that light reflects and refracts at the interface between the first refractive index layer 31 and the second refractive index layer 32, and interference occurs in the antireflection and light enhancement compensation layer 30. Utilizing this phenomenon, destructive interference can occur between the reflected visible lights generated at each interface, reducing the intensity of the reflected light and increasing the intensity of the transmitted visible light. Therefore, when the user views the screen, the external image reflected by the screen protector 100 can be reduced, and the user can clearly observe the image displayed on the screen. In addition, since the radiative cooling layer 10 adjusts the transmittance of light according to the wavelength of the light, within the visible light wavelength range, it is inevitable that the transmitted visible light is biased towards red or blue. To solve this problem, the refractive index, single-layer thickness, and number of layers of the first refractive index layer 31 and the second refractive index layer 32 in the antireflection and light enhancement compensation layer 30 can be appropriately adjusted. So that while the antireflection and light enhancement compensation layer 30 reduces reflection and increases transmission, it also takes into account the color deviation correction of the radiative cooling layer 10 to achieve color deviation compensation.

[0058] To achieve the above effects, the thickness of the anti-reflection and anti-reflection compensation layer 30 can be controlled to be 100 - 400 nanometers (nm). The refractive index of the first refractive index layer 31 can be selected from 1.6 to 2.4, and the refractive index of the second refractive index layer 32 can be selected from 1.3 to 1.5. Exemplarily, the material of the first refractive index layer 31 can be selected from titanium dioxide TiO2, niobium pentoxide Nb2O5, zirconium dioxide ZrO2, titanium trioxide Ti3O5, or hafnium oxide HfO3, and the material of the second refractive index layer 32 can be selected from silicon dioxide SiO2, aluminum oxide Al2O3, magnesium fluoride MgF2, silicon carbide SiC, or silicon monoxide SiO. The process for forming the first refractive index layer 31 and the second refractive index layer 32 can be a dry coating process, that is, coating to form the first refractive index layer 31 and the second refractive index layer 32. It can also be implemented by wet coating, that is, distributing the materials for forming the first refractive index layer 31 and the second refractive index layer 32 in coating liquids such as acrylate and polyurethane to form the first refractive index coating material and the second refractive index coating material respectively, and forming the first refractive index layer 31 and the second refractive index layer 32 by coating.

[0059] Figure 9 A schematic structural diagram of a substrate layer provided by an embodiment of the present application is shown in Figure 9 The screen protection film 100 may further include a substrate layer 40. The material of the substrate layer 40 can be a flexible material or a rigid material. Since the radiation cooling layer 10 is a flexible film layer and can be bent, it can cooperate with the flexible material substrate layer 40 to form the flexible screen protection film 100. The flexible screen protection film 100 is widely applicable to terminals with various types of screens, such as foldable screen terminals, curved screen terminals, 2.5D glass screen terminals, etc. The rigid screen protection film 100 with a rigid material substrate layer 40 is applicable to straight plate terminals and has a good effect of preventing collision and scratching. Among them, the flexible material for forming the substrate layer 40 can be selected from flexible materials with good light transmittance such as PET or PE, and the rigid material for forming the substrate layer 40 can be selected from tempered glass, etc.

[0060] In actual implementation, the various film layers described above can be combined according to actual needs to form the screen protection film 100. New film layers can also be added on the basis of the above film layers to form the screen protection film 100. Several screen protection films 100 will be exemplarily introduced below. In fact, the screen protection films that can be obtained through the present technical solution are not limited to the following several solutions. In addition, the connection method between the screen protection film and the screen is not limited to the adhesive method. For example, the screen protection film can be set on the front frame of the mobile phone case, and the front frame of the mobile phone case can be connected to the rear frame of the mobile phone case to install the screen protection film in this way.

[0061] Solution 1

[0062] Figure 10Schematic structural diagram of a screen protector provided by an embodiment of the present application. Refer to Figure 10 . The screen protector 100, from the film layer away from the screen to the film layer close to the screen, is successively a surface hardening layer 20, a radiative cooling layer 10, an intermediate adhesive layer 50, a substrate layer 40, and a screen adhesive layer 60. The formation sequence and bonding sequence of each film layer can be determined according to actual needs. Before forming the surface hardening layer 20 on the surface of the radiative cooling layer 10, a primer can be coated on the surface of the radiative cooling layer 10 away from the intermediate adhesive layer 50 to ensure the adhesion between the radiative cooling layer 10 and the surface hardening layer 20. The intermediate adhesive layer 50 is used to bond the radiative cooling layer 10 and the substrate layer 40 together, and the screen adhesive layer 60 is used to bond the substrate layer 40 and the outer surface of the mobile phone screen together. The thickness of the screen adhesive layer 60 can be set to 20 - 30 μm. The material of the screen adhesive layer 60 can be selected from acrylic system or silicone system materials. Such a design can make the peel strength of the screen adhesive layer 60 ≥ 30 grams-force (gf). Both the radiative cooling layer 10 and the substrate layer 40 are film layers for forming the screen protector 100. This solution includes both the radiative cooling layer 10 and the substrate layer 40. Such a design can reduce the design requirements for the radiative cooling layer 10. Only the radiative cooling layer 10 needs to undertake its optical function, and the mechanical properties of the substrate layer 40 are utilized to ensure the mechanical property indexes such as tensile resistance of the screen protector 100.

[0063] The material of the substrate layer 40 can be selected according to actual needs. For example, a flexible substrate layer 40 can be selected to produce a flexible screen protector 100 that can adapt to straight plate terminals and folding terminals. A rigid substrate layer 40 can also be selected to produce a rigid screen protector 100 that can adapt to straight plate terminals.

[0064] Solution Two

[0065] Figure 11 Schematic structural diagram of another screen protector provided by an embodiment of the present application. Refer to Figure 11。The screen protector 100, from the film layer away from the screen to the film layer close to the screen, is successively a surface hardening layer 20, a substrate layer 40, an intermediate adhesive layer 50, a radiative cooling layer 10, and a screen adhesive layer 60. The formation order and bonding order of each film layer can be determined according to actual needs. Before forming the surface hardening layer 20 on the surface of the substrate layer 40, a primer can be coated on the surface of the substrate layer 40 away from the intermediate adhesive layer 50 to ensure the adhesion between the substrate layer 40 and the surface hardening layer 20. The intermediate adhesive layer 50 is used to bond the radiative cooling layer 10 and the substrate layer 40 together, and the screen adhesive layer 60 is used to bond the radiative cooling layer 10 and the outer surface of the mobile phone screen together. The thickness of the screen adhesive layer 60 can be set to 20 - 30 μm. The material of the screen adhesive layer 60 can be selected from acrylic system or silicone system materials. Such a design can make the peeling force of the screen adhesive layer 60 ≥ 30 grams-force (gf). Both the radiative cooling layer 10 and the substrate layer 40 are film layers for forming the screen protector 100. This solution includes both the radiative cooling layer 10 and the substrate layer 40. Such a design can reduce the design requirements for the radiative cooling layer 10. Only the radiative cooling layer 10 needs to undertake its optical function, and the mechanical properties of the substrate layer 40 are utilized to ensure the mechanical property indexes such as tensile resistance of the screen protector 100.

[0066] The material of the substrate layer 40 can be selected according to actual needs. For example, a flexible substrate layer 40 can be selected to produce a flexible screen protector 100 that can be adapted to both straight-type terminals and foldable terminals. A rigid substrate layer 40 can also be selected to produce a rigid screen protector 100 that can be adapted to straight-type terminals.

[0067] Solution III

[0068] Figure 12 is a structural schematic diagram of another screen protector provided by an embodiment of the present application. Refer to Figure 12 。The screen protector 100, from the film layer away from the screen to the film layer close to the screen, is successively a surface hardening layer 20, a radiative cooling layer 10, and a screen adhesive layer 60. The formation order of each film layer can be determined according to actual needs. Before forming the surface hardening layer 20 on the surface of the radiative cooling layer 10, a primer can be coated on the surface of the radiative cooling layer 10 away from the screen adhesive layer 60 to ensure the adhesion between the radiative cooling layer 10 and the surface hardening layer 20. The screen adhesive layer 60 is used to bond the radiative cooling layer 10 and the outer surface of the mobile phone screen together. The thickness of the screen adhesive layer 60 can be set to 20 - 30 μm. The material of the screen adhesive layer 60 can be selected from acrylic system or silicone system materials. Such a design can make the peeling force of the screen adhesive layer 60 ≥ 30 grams-force (gf). This solution has fewer film layer structures for the screen protector 100. Therefore, the screen protector 100 is thinner and lighter, and has better compatibility with touch screens and screen fingerprint recognition.

[0069] Solution Four

[0070] Figure 13 This is a schematic structural diagram of another screen protector provided by an embodiment of the present application. Refer to Figure 13 . The screen protector 100, from the film layer far from the screen to the film layer close to the screen, is successively an antireflection and light enhancement compensation layer 30, a surface hardening layer 20, a radiative cooling layer 10, and a screen adhesive layer 60. The formation sequence of each film layer can be determined according to actual needs. Before forming the surface hardening layer 20 on the surface of the radiative cooling layer 10, a primer can be coated on the surface of the radiative cooling layer 10 far from the screen adhesive layer 60 to ensure the adhesion between the radiative cooling layer 10 and the surface hardening layer 20. The screen adhesive layer 60 is used to bond the radiative cooling layer 10 and the outer surface of the mobile phone screen together. The thickness of the screen adhesive layer 60 can be set to 20 - 30 μm. The material of the screen adhesive layer 60 can be selected from acrylic system or silicone system materials. Such a design can make the peel strength of the screen adhesive layer 60 ≥ 30 gram-force (gf). The screen protector 100 in this solution has fewer film layer structures, so the screen protector 100 is thinner and lighter, and has better compatibility with touch screens and screen fingerprint recognition. While reducing screen reflection and increasing screen transmitted light, it also takes into account the color deviation correction of the radiative cooling layer 10 to achieve color deviation compensation, so that the screen has a better color rendering effect.

[0071] The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of them belong to the protection scope of the present application.

Claims

1. A screen protector, characterized in that, It is used to be set outside the terminal screen and includes: A radiative cooling layer, including a first substrate, a second substrate, multiple first polymer layers and multiple second polymer layers. The multiple first polymer layers and the multiple second polymer layers are located between the first substrate and the second substrate, and the multiple first polymer layers and the multiple second polymer layers are alternately stacked. The radiative cooling layer is used to reflect at least part of the infrared rays and transmit visible light; the radiative cooling layer is a flexible layer; A surface hardening layer, located on the side of the radiative cooling layer away from the terminal screen, for increasing the surface hardness of the screen protector; Wherein, the refractive index of the first polymer layer is higher than that of the second polymer layer.

2. The screen protector according to claim 1, characterized in that, The material of the first substrate is one of polyethylene terephthalate (PET), polyethylene (PE) and polyimide (PI); The material of the second substrate is one of polyethylene terephthalate (PET), polyethylene (PE) and polyimide (PI).

3. The screen protection film according to claim 1, wherein The material of the first polymer layer is one of fluoropolymer, polyethylene naphthalate (PEN), polyethylene terephthalate (PET), CoPMMA, polypropylene (PP), polyethylene (PE), polyethylene copolymer, PMMA, acrylate copolymer and polyurethane; The material of the second polymer layer is one of fluoropolymer, polyethylene naphthalate (PEN), polyethylene terephthalate (PET), CoPMMA, polypropylene (PP), polyethylene (PE), polyethylene copolymer, PMMA, acrylate copolymer and polyurethane.

4. The screen protection film according to claim 1, wherein The refractive index of the first polymer layer is 1.45 - 1.65, the refractive index of the second polymer layer is 1.4 - 1.6, and the refractive index of the first polymer layer is at least 0.05 higher than that of the second polymer layer.

5. The screen protection film according to claim 1, characterized in that, The single-layer thickness of the first polymer layer is 20 - 200 nanometers, the single-layer thickness of the second polymer layer is 20 - 200 nanometers, the total thickness of the multiple first polymer layers and the multiple second polymer layers is 30 - 150 micrometers, and the multiple first polymer layers and the multiple second polymer layers total 50 - 1000 layers.

6. The screen protection film according to claim 1, characterized in that The radiative cooling layer is manufactured by a nano - lamination method.

7. The screen protection film according to claim 1, wherein The material of the surface hardening layer includes one of urethane acrylate, epoxy acrylate, polyester acrylate and pure acrylate; the thickness of the surface hardening layer is 2 - 20 micrometers.

8. The screen protection film according to claim 1, characterized in that It also includes an anti - reflection and anti - reflection compensation layer, which is the layer of the screen protector farthest from the terminal screen. The anti - reflection and anti - reflection compensation layer includes at least one first refractive index layer and at least one second refractive index layer. The refractive index of the first refractive index layer is higher than that of the second refractive index layer. The anti - reflection and anti - reflection compensation layer is used to reduce the reflection of visible light of the screen protector, increase the transmission of visible light of the screen protector, and compensate for the color deviation that occurs when visible light passes through the radiative cooling layer.

9. The screen protection film according to claim 8, characterized in that, The antireflection and antireflection compensation layer includes at least two of the first refractive index layers and at least two of the second refractive index layers, and the first refractive index layer and the second refractive index layer are alternately stacked.

10. The screen protection film according to claim 8, wherein The thickness of the antireflection and antireflection compensation layer is 100-400 nanometers, the refractive index of the first refractive index layer is 1.6-2.4, the refractive index of the second refractive index layer is 1.3-1.5, the material of the first refractive index layer is titanium dioxide, niobium pentoxide, zirconium dioxide, titanium pentoxide or hydrofluoric acid, and the material of the second refractive index layer is silicon dioxide, aluminum oxide, magnesium fluoride, silicon carbide or silicon monoxide.

11. The screen protection film according to claim 1, characterized in that, It also includes a substrate layer.

12. The screen protection film according to claim 11, characterized in that, The material of the substrate layer is a flexible material or a rigid material.

13. The screen protection film according to claim 12, characterized in that, The flexible material includes one of polyethylene terephthalate or polyethylene, and the rigid material includes tempered glass.

14. The screen protection film according to claim 11, wherein, It also includes an intermediate adhesive layer, and the intermediate adhesive layer is used to bond the radiative cooling layer and the substrate layer.

15. The screen protection film according to claim 1, wherein It also includes a screen adhesive layer, and the screen adhesive layer is used to bond the screen protection film to the outer surface of the terminal screen.

16. The screen protection film according to claim 15, characterized in that, The thickness of the screen adhesive layer is 20-30 microns, and the material of the screen adhesive layer is an acrylic system material or a silicone system material.

17. A terminal, characterized in that, The screen protection film according to any one of claims 1-16 is provided on the outer side of the screen.

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