Composite coatings, display modules and electronic devices

Abstract

The present application provides a composite coating, a display module, and an electronic device, relating to the field of terminal technology. The composite coating is applied to an electronic device, which also includes a cover plate, and the composite coating is arranged on the light-emitting side of the cover plate; the composite coating includes a self-lubricating layer, which is bonded to the cover plate, and the material of the self-lubricating layer includes a hexagonal layered structure compound and an inorganic oxide, and the equivalent refractive index range of the self-lubricating layer is 1.3 to 1.8. As a result, the self-lubricating layer not only ensures a stable bonding force between the composite coating and the cover plate, but also improves the friction resistance of the composite coating, which can effectively slow down the failure rate and time of the composite coating, thereby achieving long-term and effective protection for the highly wear-resistant cover plate.

Description

Technical Field

[0001] The present application relates to the field of terminal technology, and in particular to a composite coating, a display module, and an electronic device. Background Art

[0002] With the popularity of touch-screen electronic devices, consumers have increasingly higher expectations for their devices. When users touch or click on the screen of a touch-screen electronic device, scratches and other marks are easily left on the cover glass above the screen. To minimize scratches on the cover glass, an anti-fingerprint (AF) layer is often applied to the cover glass to protect the screen.

[0003] However, during the use of electronic devices, the AF layer usually comes into contact with the user's hands, face and other parts, and is easily contaminated with fingerprints and grease, which may cause the AF layer to fail after a period of use, seriously affecting the performance of the electronic device. Summary of the Invention

[0004] The present application provides a composite coating, a display module, and an electronic device. The self-lubricating layer in the composite coating includes a hexagonal layered structure compound and an inorganic oxide, so that the self-lubricating layer can not only support the anti-fingerprint layer and the cover plate, but also effectively improve the friction resistance of the composite coating while ensuring a stable bond between the composite coating and the cover plate, thereby achieving long-term and effective protection for the cover plate and improving the performance of the electronic device.

[0005] To achieve the above objectives, this application adopts the following technical solutions:

[0006] In a first aspect, a composite coating for use in electronic equipment is provided. The electronic equipment also includes a cover plate. The composite coating is arranged on the light-emitting side of the cover plate. The composite coating includes a self-lubricating layer. The self-lubricating layer is bonded to the cover plate. The material of the self-lubricating layer includes a hexagonal layered structure compound and an inorganic oxide. The equivalent refractive index range of the self-lubricating layer is 1.3 to 1.8.

[0007] An embodiment of the present application provides a composite coating, in which a self-lubricating layer is formed by a hexagonal layered structure compound and an inorganic oxide. On the basis that the inorganic oxide enables the self-lubricating layer to stably support the anti-fingerprint layer and the cover plate, when friction is applied to the composite coating, a very small part of the hexagonal layered structure compound decomposes during the friction process, and a chemical adsorption film is formed at the friction interface between the self-lubricating layer and the anti-fingerprint layer, thereby enhancing the wear resistance at the interface. In particular, when the user rubs along the palm direction, the friction is lower, thereby improving the friction resistance of the anti-fingerprint layer, that is, improving the friction resistance of the composite coating, delaying the failure rate and time of the composite coating, and not affecting the display, with good performance.

[0008] In a possible implementation of the first aspect, the composite coating includes a base layer and a self-lubricating layer and an anti-fingerprint layer stacked in sequence on the base layer. The self-lubricating layer is bonded to the cover plate through the base layer, and the self-lubricating layer is composed of a mixture of a hexagonal layered structure compound and an inorganic oxide.

[0009] In this implementation, the hexagonal layered structure compound and the inorganic oxide are evenly mixed to form a self-lubricating layer. The inorganic oxide enables the self-lubricating layer to stably support the anti-fingerprint layer and the cover plate. The self-lubricating layer also achieves a good bond with the cover plate through the base layer. When friction is applied to the composite coating, the hexagonal layered structure compound is partially decomposed during the friction process, and a chemical adsorption film is formed at the friction interface between the self-lubricating layer and the anti-fingerprint layer, thereby enhancing the wear resistance at the interface. Especially when the user rubs along the palm direction, the friction is lower, which improves the friction resistance of the composite coating, delays the failure rate and time of the composite coating, and does not affect the display.

[0010] In a possible implementation of the first aspect, when the hexagonal layered structure compound is mixed with the inorganic oxide to form the self-lubricating layer, the volume fraction of the hexagonal layered structure compound in the self-lubricating layer material ranges from 1% to 60%.

[0011] In this implementation method, a certain proportion of inorganic oxides is present in the self-lubricating layer, which enables the self-lubricating layer to better fit with other film layers. As the proportion of hexagonal layered structure compounds in the self-lubricating layer material increases, the dynamic friction coefficient of the composite coating can be smaller, thereby making the friction resistance of the composite coating better.

[0012] In a possible implementation of the first aspect, when the hexagonal layered structure compound and the inorganic oxide are mixed to prepare the self-lubricating layer, the equivalent refractive index of the mixed hexagonal layered structure compound and the inorganic oxide is in the range of 1.3 to 1.8.

[0013] In this implementation, when the composite coating is applied on the transparent glass cover, it can adapt to the transparent glass cover to present a transparent effect without affecting the normal display of the display screen.

[0014] In a possible implementation of the first aspect, the composite coating is used to ensure that the transmittance of light emitted from the display screen after passing through the cover plate and the composite coating in sequence is greater than 90.5%.

[0015] In this implementation, the composite coating does not affect the display effect of the display screen.

[0016] In a possible implementation of the first aspect, the thickness of the base layer in a direction perpendicular to the cover plate may range from 5 nm to 50 nm.

[0017] In this implementation, the base layer can enhance the bonding strength between the cover plate and other upper film layers without being too thick to cause the composite film layer to be too thick.

[0018] In a possible implementation of the first aspect, the thickness of the self-lubricating layer along a direction perpendicular to the cover plate may range from 5 nm to 50 nm.

[0019] In this implementation, the self-lubricating layer is not too thick, which results in the composite film layer being too thick.

[0020] In a possible implementation of the first aspect, the anti-fingerprint layer may have a thickness in a direction perpendicular to the cover plate ranging from 10 nm to 60 nm.

[0021] In this implementation, the anti-fingerprint layer is not too thick, which results in the composite film layer being too thick.

[0022] In a possible implementation of the first aspect, the composite coating includes a base layer and a self-lubricating layer and an anti-fingerprint layer stacked in sequence on the base layer. The self-lubricating layer is combined with the cover plate through the base layer, and the self-lubricating layer includes at least two sub-lubricating layers, namely a first sub-lubricating layer and a second sub-lubricating layer stacked in sequence on the base layer.

[0023] In this implementation, the first sub-self-lubricating layer is well combined with the base layer, and then the base layer is well combined with the cover plate. In addition, the hexagonal layered structure compound in the first sub-lubricating layer and / or the second sub-self-lubricating layer is slightly decomposed during the friction process, forming a chemical adsorption film at the friction interface between the self-lubricating layer and the AF layer, thereby enhancing the wear resistance at the interface. In particular, when the user rubs along the palm direction, the friction resistance is stronger, effectively delaying the failure speed and time of the composite coating without affecting the display, thereby effectively extending the service life of the electronic device and improving performance.

[0024] In a possible implementation of the first aspect, the material of the first sub-lubricating layer is an inorganic oxide or a mixture of a hexagonal layered structure compound and an inorganic oxide, and the material of the second sub-lubricating layer is a hexagonal layered structure compound or a mixture of a hexagonal layered structure compound and an inorganic oxide.

[0025] In this implementation, the first sub-self-lubricating layer is well combined with the base layer, and then the base layer is well combined with the cover plate. In addition, the hexagonal layered structure compound in the first sub-lubricating layer and / or the second sub-self-lubricating layer is slightly decomposed during the friction process, forming a chemical adsorption film at the friction interface between the self-lubricating layer and the AF layer, thereby enhancing the wear resistance at the interface. In particular, when the user rubs along the palm direction, the friction resistance is stronger, effectively delaying the failure speed and time of the composite coating without affecting the display, thereby effectively extending the service life of the electronic device and improving performance.

[0026] In a possible implementation of the first aspect, the thickness of the first sub-lubricating layer ranges from 0.1 nm to 30 nm.

[0027] In this implementation, the thickness of the first sub-lubricating layer is relatively small, which reduces the risk of the first sub-lubricating layer falling off.

[0028] In a possible implementation of the first aspect, the thickness of the second sub-lubricating layer ranges from 0.1 nm to 50 nm.

[0029] In this implementation, the thickness of the second sub-lubricating layer is relatively small, which reduces the risk of the second sub-lubricating layer falling off.

[0030] In a possible implementation of the first aspect, the equivalent refractive index range of the first sub-lubricating layer and the second sub-lubricating layer is 1.2 to 1.9.

[0031] In this implementation, when the composite coating is applied on the transparent glass cover, it can adapt to the transparent glass cover to present a transparent effect without affecting the normal display of the display screen.

[0032] In a possible implementation of the first aspect, the composite coating includes a base layer and a self-lubricating layer and an anti-fingerprint layer stacked in sequence on the base layer, the self-lubricating layer is bonded to the cover plate through the base layer, and the self-lubricating layer includes four sub-lubricating layers, namely a first sub-lubricating layer, a second sub-lubricating layer, a third sub-lubricating layer and a fourth sub-lubricating layer stacked in sequence on the base layer, wherein the material of the first sub-lubricating layer is an inorganic oxide or a mixture of a hexagonal layered structure compound and an inorganic oxide, and the materials of the second sub-lubricating layer, the third sub-lubricating layer and the fourth sub-lubricating layer can be any one of an inorganic oxide, a hexagonal layered structure compound, and a mixture of a hexagonal layered structure compound and an inorganic oxide, respectively.

[0033] In this implementation, the first sub-self-lubricating layer is well combined with the base layer, and then the base layer is well combined with the cover plate. In addition, three or more film layers are used to form a laminated structure with a certain periodicity. The thickness of each sub-self-lubricating layer is relatively thin and will not fall off. The self-lubricating layer of the laminate can significantly improve the friction resistance of the composite coating, delay the failure speed and time of the composite coating, and will not affect the display, thereby effectively extending the service life of the electronic equipment and improving the performance.

[0034] In a possible implementation of the first aspect, the composite coating includes a base layer and an anti-scratch layer, a self-lubricating layer and an anti-fingerprint layer stacked in sequence on the base layer. The self-lubricating layer is bonded to the cover plate through the base layer, and the self-lubricating layer is composed of a mixture of a hexagonal layered structure compound and an inorganic oxide.

[0035] In this implementation, the self-lubricating layer improves the friction resistance of the composite coating, delays the failure rate and time of the composite coating, and does not affect the display. On this basis, since the anti-scratch layer can increase the hardness of the composite coating, the composite coating has stronger scratch resistance after contacting hard objects, and has excellent puncture resistance and scratch resistance, thereby further improving the performance of the composite coating.

[0036] In a possible implementation of the first aspect, the composite coating includes a base layer and an anti-scratch layer, a self-lubricating layer, and an anti-fingerprint layer stacked in sequence on the base layer. The self-lubricating layer is combined with the cover plate through the base layer, and the self-lubricating layer includes at least two sub-lubricating layers, namely a first sub-lubricating layer and a second sub-lubricating layer stacked in sequence on the base layer.

[0037] In this implementation, the self-lubricating layer improves the friction resistance of the composite coating, delays the failure rate and time of the composite coating, and does not affect the display. On this basis, since the anti-scratch layer can increase the hardness of the composite coating, the composite coating has stronger scratch resistance after contacting hard objects, and has excellent puncture resistance and scratch resistance, thereby further improving the performance of the composite coating.

[0038] In a possible implementation of the first aspect, a dynamic friction coefficient of the composite coating is less than or equal to 0.03.

[0039] In this implementation, the self-lubricating layer improves the friction resistance of the composite coating and delays the failure rate and time of the composite coating.

[0040] In a possible implementation manner of the first aspect, the hexagonal layered structure compound includes diamond-like carbon.

[0041] In this implementation, diamond-like carbon is a mixed phase composed of the tetrahedral structure of diamond and the hexagonal layered structure of graphite. When the hexagonal layered structure of graphite is subjected to friction, the binding force between different atoms in the hexagonal layered structure compound is strong along the direction of the user's palm surface, and the binding force between different atoms in the hexagonal layered structure compound is very weak in the direction perpendicular to the user's palm surface. Therefore, a very small part of the hexagonal layered structure compound will decompose during the friction process, and a corresponding chemical adsorption film will be formed at the friction interface of the self-lubricating layer near the AF layer. This chemical adsorption film can enhance the wear resistance at the interface.

[0042] In a possible implementation of the first aspect, the hexagonal layered structure compound includes a hexagonal layered structure rare earth fluoride, and the hexagonal layered structure rare earth fluoride includes a hexagonal layered structure lanthanum trifluoride, a hexagonal layered structure cerium trifluoride, a hexagonal layered structure yttrium fluoride and a hexagonal layered structure uranium trifluoride.

[0043] In this implementation, rare earth fluorides have a variety of structures, such as ionic crystal structure, polycrystalline structure, hexagonal layered structure, etc. When the rare earth fluoride with hexagonal layered structure is subjected to friction, the binding force between different atoms in the hexagonal layered structure compound is strong along the direction of the user's palm surface, and the binding force between different atoms in the hexagonal layered structure compound is very weak in the direction perpendicular to the user's palm surface. Therefore, during the friction process, a very small part of the hexagonal layered structure compound will decompose and form a corresponding chemical adsorption film at the friction interface of the self-lubricating layer near the AF layer. This chemical adsorption film can enhance the wear resistance at the interface.

[0044] In a possible implementation of the first aspect, the refractive index of the hexagonal layered structure compound ranges from 1.55 to 1.62, and the melting point of the hexagonal layered structure compound is greater than 1400°C.

[0045] In this implementation, the film layer formed by the hexagonal layered structure compound does not affect the display effect, and its high melting point makes the composite coating exhibit good chemical inertness and strong resistance to acid and alkali corrosion.

[0046] In a possible implementation of the first aspect, two targets are provided, one target containing a hexagonal layered structure compound and the other target containing an inorganic oxide, and magnetron sputtering is performed on the two targets to form a self-lubricating layer.

[0047] This implementation is simple and easy to implement.

[0048] In a second aspect, an electronic device is provided, comprising a display screen, a cover plate, and a composite coating as in the first aspect or any possible implementation of the first aspect, wherein the cover plate is arranged on the light-emitting side of the display screen, and the composite coating is arranged on the side of the cover plate away from the display screen.

[0049] An embodiment of the present application provides an electronic device in which a composite coating can remain effective for a long period of time, thereby improving the smooth feel of the user.

[0050] In a possible implementation of the second aspect, the composite coating is used to ensure that the transmittance of light emitted from the display screen is greater than 90.5% after the light passes through the cover plate and the composite coating in sequence.

[0051] In this implementation, the composite coating does not affect the display effect.

[0052] An embodiment of the present application provides a composite coating. When the composite coating is applied to a cover plate, the self-lubricating layer in the composite coating can be combined with the cover plate and can also support the cover plate and the anti-fingerprint layer. When friction is applied, a very small portion of the hexagonal layered structure compound in the self-lubricating layer decomposes, forming a chemical adsorption film at the friction interface between the self-lubricating layer and the anti-fingerprint layer, thereby enhancing the wear resistance at the interface. In particular, when the user rubs along the palm direction, the friction is lower, thereby improving the friction resistance of the composite coating, delaying the failure rate and time of the composite coating, and not affecting the display. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 A schematic diagram of the overall structure of an electronic device provided in an embodiment of the present application;

[0054] Figure 2 for Figure 1 Schematic diagram of the disassembled structure of the electronic device;

[0055] Figure 3 A schematic diagram of the structure of a display screen and a cover provided for related technology;

[0056] Figure 4 A schematic diagram of the structure of a display screen, a cover plate and a protective layer provided for related technologies;

[0057] Figure 5 A schematic diagram of another structure of a display screen, a cover plate, and a protective layer provided for related technology;

[0058] Figure 6 A schematic structural diagram of the first composite coating provided in an embodiment of the present application;

[0059] Figure 7 A schematic structural diagram of a second composite coating provided in an embodiment of the present application;

[0060] Figure 8 A schematic structural diagram of a third composite coating provided in an embodiment of the present application;

[0061] Figure 9 A schematic structural diagram of a fourth composite coating provided in an embodiment of the present application;

[0062] Figure 10 A schematic structural diagram of a fifth composite coating provided in an embodiment of the present application;

[0063] Figure 11 A schematic structural diagram of a sixth composite coating provided in an embodiment of the present application;

[0064] Figure 12 A schematic diagram of a hundred-grid marking method provided in an embodiment of the present application, classified as 3mm≤ink width<12mm;

[0065] Figure 13 A schematic diagram of another hundred-grid marking method provided in an embodiment of the present application, classified as 3mm≤ink width<12mm;

[0066] Figure 14 A schematic diagram of a hundred-grid scratching method classified as 1mm≤ink width<3mm provided in an embodiment of the present application;

[0067] Figure 15 A schematic diagram of another hundred-grid marking method provided in an embodiment of the present application, classified as 1mm≤ink width<3mm.

[0068] Reference numerals:

[0069] 01-mobile phone; 100-display screen; 101-middle frame; 102-back cover; 103-circuit board assembly; 1031-main circuit board; 1032-electronic components; 104-battery; 105-cover plate; 20-base layer;

[0070] 02-composite coating; 3-AF layer; 4-anti-scratch layer; 5-self-lubricating layer; 51-first sub-lubricating layer; 52-second sub-lubricating layer; 53-third sub-lubricating layer; 54-fourth sub-lubricating layer. DETAILED DESCRIPTION

[0071] The following is a clear and detailed description of the technical solutions in the embodiments of the present application, with reference to the accompanying drawings. In the description of the embodiments of the present application, unless otherwise specified, " / " represents the meaning of "or." For example, A / B can represent A or B. "and / or" in the text is merely a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone.

[0072] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to imply or suggest relative importance or implicitly indicate the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of this application, unless otherwise specified, "multiple" means two or more. "At least one" means one or more.

[0073] First, some of the terms used in the embodiments of the present application are explained so that those skilled in the art can better understand them.

[0074] 1. AF layer

[0075] The AF layer uses a special coating material that can effectively absorb the oil and sweat left by fingerprints, making the traces left by fingerprints very faint; at the same time, it can also prevent the traces left by fingerprints from being discovered and copied by others, thereby improving the security and accuracy of fingerprint recognition.

[0076] 2. Mohs hardness

[0077] Mohs hardness is a standard for indicating the hardness of a material. It involves scratching the surface of a test material with a pyramidal diamond needle using a scratching method and measuring the depth of the scratch. The depth of the scratch is the Mohs hardness.

[0078] 3. Vickers hardness

[0079] Vickers hardness is a standard for expressing the hardness of materials. It refers to using a diamond right pyramid indenter with an angle of 136° between the relative surfaces to press into the surface of the tested material under a specified load. After maintaining the load for a certain period of time, the load is removed and the diagonal length of the indentation is measured. The surface area of ​​the indentation is then calculated. The average pressure on the indentation surface area is the Vickers hardness value of the tested material, represented by the symbol HV.

[0080] 4. Hexagonal system

[0081] The hexagonal system refers to a crystal structure with six prismatic faces, each consisting of two bases and six side faces. The hexagonal layered structure is formed by repeated stacking along the c-axis of the unit cell. Within each layer, atoms are arranged along a hexagonal path, forming a planar six-membered ring structure.

[0082] 5. Dynamic friction coefficient

[0083] The coefficient of kinetic friction is the ratio of friction to the normal pressure when two objects in contact are in relative motion. When the objects are in horizontal motion, the normal pressure is equal to the force of gravity. The coefficient of kinetic friction varies for objects made of different materials, with the rougher the object, the greater the coefficient of kinetic friction.

[0084] The above is a brief introduction to the nouns involved in the embodiments of this application, and no further details will be given below.

[0085] The embodiments of the present application do not impose any restrictions on the specific types of electronic devices. In some embodiments, the electronic devices of the present application may include mobile phones, wearable devices (such as smart bracelets, smart watches, headphones, etc.), tablet computers, laptop computers, handheld computers, notebook computers, ultra-mobile personal computers (UMPCs), cellular phones, personal digital assistants (PDAs), augmented reality (AR) and virtual reality (VR) devices, and other Internet of Things (IoT) devices, in-vehicle electronic devices, and may also be televisions, large screens, printers, projectors, and other devices.

[0086] The embodiments of the present application do not limit the specific form of the electronic device. For the convenience of description, the following description will first be given by taking a mobile phone as an example.

[0087] Please refer to Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of a mobile phone 01 applicable to some embodiments of the present application. Figure 2 for Figure 1 The disassembly diagram of the mobile phone 01 is shown in FIG. Figure 1 and Figure 2 The mobile phone 01 shown is described by taking a tablet phone as an example. In other embodiments, other types of mobile phones, such as a foldable mobile phone, may also be used.

[0088] exist Figure 1 and Figure 2 In the example of FIG, the mobile phone 01 may include a display screen 100, a middle frame 101, a rear shell 102, a circuit board assembly 103 and a battery 104. It is understood that, Figure 1 and Figure 2 The following figures and the related drawings only schematically illustrate some components of the mobile phone 01, and the actual shape, size, position and structure of these components are not affected by Figure 1 and Figure 2 and the limitations of the accompanying drawings below.

[0089] like Figure 1 and Figure 2As shown, the display screen 100 in the mobile phone 01 is located on one side of the middle frame 101. In applications, the display screen 100 can be used to display images, videos, etc. The display screen 100 can be any of a liquid crystal display (LCD), an organic light emitting diode (OLED) display, a sub-millimeter light emitting diode (Mini LED) display, a micro light emitting diode (Micro LED) display, etc.

[0090] In addition, the display screen 100 may be a foldable screen, depending on the actual application.

[0091] refer to Figure 2 As shown, the back cover 102 of the mobile phone 01 is arranged on the side of the middle frame 101 away from the display screen 100, and the space between the back cover 102 and the middle frame 101 forms an internal storage space of the mobile phone 01, which houses the circuit board assembly 103 and the battery 104. The battery 104 can be used to provide power to the components of the mobile phone 01 such as the display screen 100 and the circuit board assembly 103.

[0092] like Figure 2 As shown, the circuit board assembly 103 includes a main circuit board 1031 and electronic components 1032 , etc. The main circuit board 1031 can be used to carry the electronic components 1032 and perform signal interaction with the electronic components 1032 . Figure 2 The following example illustrates a circuit board assembly 103 including two electronic components 1032. However, the number of electronic components 1032 is not limited to two and depends on the actual application. In practice, the main circuit board 1031 may include printed circuit boards (PCBs), flexible printed circuits (FPCs), and the like. Electronic components 1032 may include, but are not limited to, chips, resistors, capacitors, inductors, potentiometers, electron tubes, heat sinks, electromechanical components, connectors, discrete semiconductors, sensors, power supplies, switches, micromotors, electronic transformers, relays, and subscriber identity module (SIM) card holders.

[0093] Please refer to Figure 2 The mobile phone 01 further includes a cover plate 105 , which can be stacked with the display screen 100 and is mainly used to protect and prevent dust from the display screen 100 . The cover plate 105 can be fixed on the frame.

[0094] In practical applications, the cover plate may be made of glass, such as ordinary glass or other glass. The other glass herein refers to glass with special materials and functions, which differ from ordinary glass. Since the cover plate 105 directly covers the display screen 100, in order to avoid affecting the normal display of the display screen 100, the cover plate 105 may be made of translucent glass. In this case, the cover plate 105 is a translucent glass cover plate.

[0095] Now Figure 2 The display screen 100 and the cover plate 105 are cut along F1F2 to obtain Figure 3 A cross-sectional view of the display screen 100 and the cover plate 105 is shown.

[0096] In the related art, if the cover plate 105 is used without a protective layer, it will generally develop visible scratches on the cover plate 105 within a short period of time, causing the cover plate 105 to be scratched. Moreover, as the phone is used for a longer time, the scratches will increase in number, which not only affects the appearance of the phone but also disrupts the stress balance of the cover plate 105, resulting in a decrease in the impact resistance of the cover plate 105. Therefore, a protective layer is generally applied to the surface of the cover plate 105 to prevent the cover plate 105 from being scratched, damaged, or broken.

[0097] In applications, the outermost protective layer is typically the AF layer. With the development of smartphones and touch display technology, users often come into direct contact with the phone's display. During use, the AF layer comes into contact with the user's hands, face, and other parts of the body, causing it to become contaminated with fingerprints and grease. These substances not only render the phone's surface unsightly but can also cause the protective layer to lose effectiveness. This failure makes fingerprints difficult to wipe off and reduces the user's smooth feel.

[0098] Currently, the AF layer fails at different rates in different products and application scenarios. For example, for cover 105, the AF layer may fail within three months in typical chat and typing scenarios. However, in heavy gaming scenarios, the fixed areas of cover 105 wear faster, and localized AF layer failure may occur within one month.

[0099] To solve the above problem, as an example, Figure 4 A structural schematic diagram of a related art cover plate 105 with a protective layer is shown.

[0100] like Figure 4 As shown, the mobile phone 01 includes: a display screen 100 and a cover plate 105, a base layer 20 and an AF layer 3 stacked in sequence on the display screen 100. The cover plate 105 here is an ordinary glass cover plate, and the base layer 20 can be formed by electron beam evaporation, silicon target sputtering, thick coating, etc.

[0101] Since SiO2 and the like have a glass structure and are close in composition to glass, they can better fit with ordinary glass cover plates and have stronger bonding force with ordinary glass cover plates. Therefore, the material of the base layer 20 may include SiO2 and the like.

[0102] Figure 4 Advantages of the structure: the AF layer 3 has a good anti-fingerprint effect and high smoothness, and the base layer 20 and the AF layer 3 belong to an optical film system and do not absorb visible light, so that the transmittance of the protective film can be greater than 91%, which does not affect the display of the display screen 100.

[0103] In practical applications, the material of the AF layer may include a perfluoropolyether siloxane structure having an anti-fingerprint effect, and the like.

[0104] Figure 4 Structural disadvantages: During the friction process, the AF layer 3 strongly relies on its own wear resistance, but the friction resistance of the AF layer 3 is poor, resulting in the AF layer 3 failing due to friction wear after about 3 months of normal use. That is, the failure is fast, resulting in the inability to effectively protect the ordinary glass cover plate or even the display screen 100.

[0105] As another example, Figure 5 A schematic structural diagram of another related art cover plate 105 with a protective layer is shown.

[0106] Figure 5 and Figure 4 The difference is: Figure 4 On the basis of Figure 5 Mobile phone 01 also includes an anti-scratch layer 4 disposed between the base layer 20 and the AF layer 3. The cover plate 105 is a glass cover plate other than an ordinary glass cover plate. It should be noted that the other glass cover plates are glass cover plates with special materials and functions, different from ordinary glass cover plates. For example, the surface roughness of the other glass cover plates may be increased by approximately 3 to 5 times compared to ordinary glass cover plates, and the cover plates may have characteristics such as a highly dense structure.

[0107] Figure 5 Structural advantages: Improves the scratch resistance and drop resistance of the mobile phone 01.

[0108] Figure 5 Structural disadvantages: After the anti-scratch layer 4 is thickly plated on the surface of the other glass cover plates, the characteristics of the other glass cover plates will cause the bonding strength between the other glass cover plates and the AF layer 3 to decrease, making the AF layer 3 more prone to wear and failure during use, that is, the failure will be faster, for example, it may fail in less than 1 month, resulting in the inability to effectively protect the other glass cover plates and even the display screen 100.

[0109] Based on the above description, it can be seen that the protective layer provided by the relevant technology cannot slow down the failure of the AF layer, and cannot take into account wear resistance and scratch resistance, etc., resulting in poor protection of the cover, which in turn affects the performance of the electronic device.

[0110] The above only introduces the content related to the invention. The rest of the content can be obtained by referring to the relevant technology and will not be described in detail here.

[0111] Please refer to the following Figures 6 to 11 , a detailed introduction is given to the composite coatings 02 of various structures provided in the embodiments of the present application.

[0112] 1. Case 1

[0113] Example 1 (reference Figure 6 ):

[0114] like Figure 6 As shown, the composite coating 02 provided in the embodiment of the present application is arranged on the cover plate of the display screen of the electronic device. The composite coating 02 includes: a base layer 20, and a self-lubricating layer 5 and an AF layer 3 stacked in sequence on the base layer 20. The self-lubricating layer 5 is adhered to the cover plate through the base layer 20. The self-lubricating layer 5 is formed by a mixture of a hexagonal layered structure compound and an inorganic oxide.

[0115] In practical applications, taking rare earth fluorides as an example, rare earth fluorides have a variety of structures, such as hexagonal layered structure, tetragonal layered structure, etc. Among them, rare earth fluorides with tetragonal layered structure are usually harder and are generally often used as materials for anti-scratch layers. Therefore, when an anti-scratch layer formed by rare earth fluorides with tetragonal layered structure is provided on the cover plate, the anti-scratch, anti-puncture, and anti-scratch properties can be enhanced.

[0116] The rare earth fluorides with hexagonal layered structures have layered lubrication properties, weak interlayer forces, and strong intralayer atomic forces (mainly van der Waals forces, with a few hydrogen bonds). This allows the rare earth fluorides with hexagonal layered structures to have the following properties: for example, a refractive index ranging from 1.55 to 1.62, a melting point greater than 1400°C, etc. For example, the refractive index of the rare earth fluorides with hexagonal layered structures can be 1.55, 1.56, 1.58, 1.60, 1.61, or 1.62, etc., and the melting point of the rare earth fluorides with hexagonal layered structures can be 1450°C, 1500°C, 1600°C, 1800°C, 200°C, or 2400°C, etc. Therefore, the refractive index of the rare earth fluoride with a hexagonal layered structure can make the transmittance of the film layer it constitutes higher, and then when combined with a transparent glass cover, it can present a better transparency effect without affecting the normal display of the display screen; the rare earth fluoride with a hexagonal layered structure has a high melting point, which can make the composite coating exhibit good chemical inertness and strong resistance to acid and alkali corrosion.

[0117] It should be noted that the transparent glass cover is set on the display screen, and the light emitted from the display screen enters the composite coating 02 after passing through the transparent glass cover, and the side of the transparent glass cover away from the display screen is the light-emitting side.

[0118] Then, when the user Figure 6 When the composite coating 02 in the self-lubricating layer 5 is subjected to friction, the hexagonal layered rare earth fluoride in the self-lubricating layer 5 is subjected to the friction. In the direction along the user's palm surface, the binding force between different atoms in the hexagonal layered rare earth fluoride is strong. In the direction perpendicular to the user's palm surface, the binding force between different atoms in the hexagonal layered rare earth fluoride is very weak. Therefore, during the friction process, a very small part of the hexagonal layered rare earth fluoride will decompose and form corresponding chemical adsorption at the friction interface of the self-lubricating layer 5 near the AF layer 3. Film, this chemical adsorption film can enhance the wear resistance at the interface. Therefore, when the self-lubricating layer 5 and the AF layer 3 together form the composite coating 02, the dynamic friction coefficient of the composite coating 02 is less than or equal to 0.03. For example, the dynamic friction coefficient of the composite coating 02 is 0.02, 0.019, 0.018, 0.015, 0.01 or 0.005, etc., thereby improving the friction resistance of the composite coating 02, delaying the failure speed and time of the composite coating 02, and effectively protecting the cover plate and even the display screen.

[0119] In addition, the hexagonal layered structure compound may include not only rare earth fluorides with a hexagonal layered structure, but also diamond-like carbon (DLC), which is a mixed phase consisting of the tetrahedral structure of diamond and the hexagonal layered structure of graphite.

[0120] In applications, hexagonal layered rare earth fluorides may include hexagonal layered lanthanum trifluoride (LaF3), hexagonal layered cerium trifluoride (CeF3), hexagonal layered yttrium fluoride (YF3), and hexagonal layered uranium trifluoride (UF3).

[0121] Taking LaF3 with hexagonal layered structure as an example, during the friction process, the hexagonal layered structure of LaF3 decomposes into single La + and F - , La + and F - The chemical adsorption film is concentrated at the interface between the self-lubricating layer 5 and the AF layer 3, which can enhance the wear resistance and play a lubricating effect. When the friction force is removed, La + and F -It is recombined into LaF3. At this time, the self-lubricating layer 5 still has a certain wear resistance, but the wear resistance is reduced compared with before. Therefore, after the film layer is formed by utilizing the characteristics of the material with a hexagonal layered structure and stacking it with the AF layer, the wear resistance of the surface of the composite coating 02 can be effectively enhanced.

[0122] In addition, please refer to Figure 6 In order to make the self-lubricating layer 5 adhere to the cover plate, a primer layer 20 is provided between the cover plate and the self-lubricating layer 5. The material of the primer layer 20 is SiO2 or other materials with a glass structure and a composition close to that of glass. In this way, the self-lubricating layer 5 can be better adhered to the glass cover plate through the primer layer 20, and the bonding force is stronger. On this basis, in addition to providing a hexagonal layered structure compound in the self-lubricating layer 5, the embodiment of the present application also provides an inorganic oxide, such as an inorganic silicon oxide, an inorganic aluminum oxide, etc. Among them, the inorganic silicon oxide can be SiO2 or the like, and the inorganic aluminum oxide can be Al2O3 or the like, which are similar to the materials of the primer layer 20. Therefore, the self-lubricating layer 5 can be well bonded to the primer layer 20 through the inorganic oxide, and the bonding force is strong.

[0123] In summary, a mixture of rare earth fluorides and / or diamond-like carbon with a hexagonal layered structure and inorganic silicon oxide and / or inorganic aluminum oxide can be used to prepare a self-lubricating layer 5 on the base layer 20 through processes such as evaporation or magnetron sputtering. On the one hand, the self-lubricating layer 5 can be well bonded to the base layer 20 through the inorganic silicon oxide and / or inorganic aluminum oxide. On the other hand, the hexagonal layered structure of rare earth fluorides and / or diamond-like carbon can improve the friction resistance of the composite coating 02.

[0124] It should be noted that, taking LaF3 and SiO2 with hexagonal layered structures as an example, both are inorganic compounds and are bulk crystals at room temperature. Therefore, two targets can be provided respectively, one target containing LaF3 with hexagonal layered structure and the other target containing SiO2. When mixing is required, magnetron sputtering is performed on the two targets to form a self-lubricating layer 5.

[0125] In practical applications, the volume fraction of the hexagonal layered structure compound in the self-lubricating layer material ranges from 1% to 60%. Furthermore, the volume fraction of the hexagonal layered structure compound in the self-lubricating layer material ranges from 1% to 40%, and even further, the volume fraction of the hexagonal layered structure compound in the self-lubricating layer material ranges from 10% to 25%. Thus, when a certain proportion of inorganic oxide is present in the self-lubricating layer 5, the self-lubricating layer 5 achieves better adhesion with other film layers. As the proportion of the hexagonal layered structure compound in the self-lubricating layer material increases, the dynamic friction coefficient of the composite coating 02 decreases, thereby improving the friction resistance of the composite coating 02. For example, the friction resistance of the composite coating 02 can be increased by approximately 3 to 6 times compared to conventional coatings in the related art. For example, the ratio of the hexagonal layered structure compound to the inorganic oxide can be 10%, 15%, 18%, 20%, 22%, or 25%, etc.

[0126] When the hexagonal layered structure compound is mixed with an inorganic oxide to prepare a self-lubricating layer 5, the equivalent refractive index range of the hexagonal layered structure compound and the inorganic oxide after mixing can be 1.3 to 1.8. Thus, when the composite coating is applied to a transparent glass cover, it can adapt to the transparent glass cover to present a transparent effect without affecting the normal display of the display screen. Furthermore, the equivalent refractive index range of the hexagonal layered structure compound and the inorganic oxide after mixing can be 1.5 to 1.6. For example, the equivalent refractive index of the hexagonal layered structure compound and the inorganic oxide after mixing can be 1.5, 1.52, 1.54, 1.56, 1.58 or 1.6, etc. At this time, the transmittance is very high, and a better display effect can be achieved.

[0127] Therefore, the composite coating can be used to make the transmittance of the light emitted by the display screen after passing through the cover plate and the composite coating in sequence greater than 90.5%. For example, the transmittance of the light emitted by the display screen after passing through the cover plate and the composite coating in sequence can be 90.9%, 91%, 92%, 93%, 94% or 95%, etc., so that the composite coating will not affect the display effect of the display screen.

[0128] In addition, the base layer 20 is mainly used to enhance the bonding strength between the cover plate and other upper film layers, so it cannot be too thick. Figure 6 As shown, along the OY direction, the thickness d2 of the base layer 20 may range from 5 nm to 50 nm. For example, d2 may be 5 nm, 10 nm, 20 nm, 30 nm, 40 nm or 50 nm.

[0129] Along the OY direction, the thickness d5 of the self-lubricating layer 5 may range from 5 nm to 50 nm. For example, d5 may be 5 nm, 10 nm, 20 nm, 30 nm, 40 nm or 50 nm.

[0130] Along the OY direction, the thickness d3 of the AF layer 3 may be in the range of 10 nm to 60 nm. For example, d3 may be 10 nm, 20 nm, 30 nm, 40 nm, 50 nm or 60 nm.

[0131] The composite coating provided in the embodiments of the present application uniformly mixes a hexagonal layered compound and an inorganic oxide to form a self-lubricating layer. The inorganic oxide enables the self-lubricating layer to stably support the AF layer and the base layer, which is then bonded to the cover plate via the base layer. On this basis, the hexagonal layered compound decomposes slightly during the friction process, forming a chemical adsorption film at the friction interface between the self-lubricating layer and the AF layer, enhancing the wear resistance at the interface. This is especially true when the user rubs along the palm direction, effectively slowing the failure rate and duration of the composite coating without affecting the display, thereby effectively extending the service life of the electronic device and improving its performance.

[0132] 2. The second situation

[0133] Example 2 (reference Figure 7 and Figure 8 ):

[0134] As an example, Figure 7 The composite coating 02 shown with Figure 6 The difference of the composite coating 02 shown is that: Figure 7 As shown, the self-lubricating layer 5 includes two sub-lubricating layers, namely a first sub-lubricating layer 51 and a second sub-lubricating layer 52 which are sequentially stacked on the primer layer 20 .

[0135] The material of the first sub-lubricating layer 51 is an inorganic oxide or a mixture of a hexagonal layered structure compound and an inorganic oxide, and the material of the second sub-lubricating layer 52 is a hexagonal layered structure compound or a mixture of a hexagonal layered structure compound and an inorganic oxide.

[0136] Specifically, the material of the first sub-lubricating layer 51 is an inorganic oxide, and the material of the second sub-lubricating layer 52 is a hexagonal layered structure compound; or, the material of the first sub-lubricating layer 51 is a mixture of a hexagonal layered structure compound and an inorganic oxide, and the material of the second sub-lubricating layer 52 is a hexagonal layered structure compound; or, the material of the first sub-lubricating layer 51 is an inorganic oxide, and the material of the second sub-lubricating layer 52 is a mixture of a hexagonal layered structure compound and an inorganic oxide; or, the material of the first sub-lubricating layer 51 is a mixture of a hexagonal layered structure compound and an inorganic oxide, and the material of the second sub-lubricating layer 52 is an inorganic oxide.

[0137] On this basis, the hexagonal layered structure compound can be a single hexagonal layered structure rare earth fluoride, diamond-like carbon, or a mixture of hexagonal layered structure rare earth fluoride and diamond-like carbon; the inorganic oxide can be a single SiO2, Al2O3, or a mixture of SiO2 and Al2O3, which is not specifically limited here.

[0138] In practical applications, along Figure 7 In the OY direction, the thickness of the first sub-lubricating layer 51 ranges from 0.1 nm to 30 nm, and the thickness of the second sub-lubricating layer 52 ranges from 0.1 nm to 50 nm. For example, the thickness of the first sub-lubricating layer 51 can be 0.1 nm, 1 nm, 10 nm, 20 nm, 25 nm, or 30 nm, and the thickness of the second sub-lubricating layer 52 can be 0.1 nm, 1 nm, 10 nm, 20 nm, 30 nm, or 50 nm. As a result, the thicknesses of both the first and second sub-lubricating layers are relatively small, reducing the risk of the first and second sub-lubricating layers falling off.

[0139] Furthermore, the equivalent refractive index of the first and second sub-lubricating layers 51, 52 is in the range of 1.2 to 1.9. Furthermore, the equivalent refractive index of the first and second sub-lubricating layers 51, 52 is in the range of 1.3 to 1.8. For example, the equivalent refractive index of the first and second sub-lubricating layers 51, 52 can be in the range of 1.3, 1.4, 1.5, 1.6, 1.7, or 1.8, etc. Thus, when the composite coating is applied to a transparent glass cover, it can adapt to the transparent glass cover and present a transparent effect without affecting the normal display of the display.

[0140] The composite coating provided in the embodiment of the present application is well bonded to the base layer through the first sub-self-lubricating layer, and then well bonded to the cover plate through the base layer. In addition, the hexagonal layered structure compound in the first sub-lubricating layer and / or the second sub-self-lubricating layer is slightly decomposed during the friction process, forming a chemical adsorption film at the friction interface between the self-lubricating layer and the AF layer, thereby enhancing the wear resistance at the interface. In particular, when the user rubs along the palm direction, the friction resistance is even stronger, effectively delaying the failure speed and time of the composite coating without affecting the display, thereby effectively extending the service life of the electronic device and improving performance.

[0141] As another example, Figure 8 The composite coating 02 shown in Figure 7 Based on the composite coating 02 shown, the difference is that the self-lubricating layer 5 includes four sub-lubricating layers, namely a first sub-lubricating layer 51, a second sub-lubricating layer 52, a third sub-lubricating layer 53 and a fourth sub-lubricating layer 54 stacked in sequence on the base layer 20.

[0142] Among them, the material of the first sub-lubricating layer 51 is an inorganic oxide or a mixture of a hexagonal layered structure compound and an inorganic oxide, and the materials of the second sub-lubricating layer 52, the third sub-lubricating layer 53 and the fourth sub-lubricating layer 54 can be any one of inorganic oxides, hexagonal layered structure compounds, and a mixture of a hexagonal layered structure compound and an inorganic oxide, respectively.

[0143] 1. The materials of two of the four sub-lubricating layers are the same:

[0144] Exemplarily, the material of the first sub-lubricating layer 51 is the same as the material of the third sub-lubricating layer 53, and the material of the second sub-lubricating layer 52 is the same as the material of the fourth sub-lubricating layer 54; or, the material of the first sub-lubricating layer 51 is the same as the material of the fourth sub-lubricating layer 54, and the material of the second sub-lubricating layer 52 is the same as the material of the third sub-lubricating layer 53.

[0145] Specifically, the material of the first sub-lubricating layer 51 and the material of the third sub-lubricating layer 53 are both SiO2, and the material of the second sub-lubricating layer 52 and the material of the fourth sub-lubricating layer 54 are both LaF3 with a hexagonal layered structure; or, the material of the first sub-lubricating layer 51 and the material of the fourth sub-lubricating layer 54 are both Al2O3, and the material of the second sub-lubricating layer 52 and the material of the third sub-lubricating layer 53 are both CeF3 with a hexagonal layered structure.

[0146] 2. The materials of three of the four sub-lubricating layers are the same:

[0147] Illustratively, the material of the first sub-lubricating layer 51 , the material of the second sub-lubricating layer 52 and the material of the fourth sub-lubricating layer 54 are the same; or, the material of the first sub-lubricating layer 51 , the material of the third sub-lubricating layer 53 and the material of the fourth sub-lubricating layer 54 are the same.

[0148] Specifically, the material of the first sub-lubricating layer 51, the material of the second sub-lubricating layer 52 and the material of the fourth sub-lubricating layer 54 are all SiO2, and the material of the third sub-lubricating layer 53 is LaF3 with a hexagonal layered structure; or, the material of the first sub-lubricating layer 51, the material of the third sub-lubricating layer 53 and the material of the fourth sub-lubricating layer 54 are all Al2O3, and the material of the second sub-lubricating layer 52 is CeF3 with a hexagonal layered structure.

[0149] 3. The materials of three of the four sub-lubricating layers are different:

[0150] Exemplarily, the material of the first sub-lubricating layer 51 may be the same as the material of one of the second sub-lubricating layer 52, the third sub-lubricating layer 53 and the fourth sub-lubricating layer 54; or, the material of the first sub-lubricating layer 51 may be different from the material of the second sub-lubricating layer 52, the third sub-lubricating layer 53 and the fourth sub-lubricating layer 54. In this case, the materials of two of the second sub-lubricating layer 52, the third sub-lubricating layer 53 and the fourth sub-lubricating layer 54 are the same.

[0151] Specifically, the materials of the first sub-lubricating layer 51 and the second sub-lubricating layer 52 are both SiO2, the material of the third sub-lubricating layer 53 is LaF3 with a hexagonal layered structure, and the material of the fourth sub-lubricating layer 54 is SiO2; or, the materials of the first sub-lubricating layer 51 and the second sub-lubricating layer 52 are both SiO2, the material of the third sub-lubricating layer 53 is LaF3 with a hexagonal layered structure, and the material of the fourth sub-lubricating layer 54 is Al2O3; or, the materials of the first sub-lubricating layer 51 and the second sub-lubricating layer 52 are both SiO2, the material of the third sub-lubricating layer 53 is LaF3 with a hexagonal layered structure, and the material of the fourth sub-lubricating layer 54 is Al2O3. The material of the first sub-lubricating layer 51 is LaF3, and the material of the fourth sub-lubricating layer 54 is CeF3 with a hexagonal layered structure; or, the first sub-lubricating layer 51 is SiO2, the material of the second sub-lubricating layer 52 and the material of the fourth sub-lubricating layer 54 are both LaF3 with a hexagonal layered structure, and the material of the third sub-lubricating layer 53 is Al2O3; or, the first sub-lubricating layer 51 is SiO2, the material of the second sub-lubricating layer 52 and the material of the fourth sub-lubricating layer 54 are both LaF3 with a hexagonal layered structure, and the material of the third sub-lubricating layer 53 is CeF3 with a hexagonal layered structure. Of course, there are many similar examples, which will not be explained here one by one.

[0152] 4. The materials of the four sub-lubricating layers are different:

[0153] Specifically, the first sub-lubricating layer 51 is SiO2, the material of the second sub-lubricating layer 52 is LaF3 with a hexagonal layered structure, the material of the third sub-lubricating layer 53 is Al2O3, and the material of the fourth sub-lubricating layer 54 is CeF3 with a hexagonal layered structure; or, the first sub-lubricating layer 51 is SiO2, the material of the second sub-lubricating layer 52 is Al2O3, the material of the third sub-lubricating layer 53 is LaF3 with a hexagonal layered structure, and the material of the fourth sub-lubricating layer 54 is CeF3 with a hexagonal layered structure. Of course, there are many similar examples, which will not be explained one by one here.

[0154] It should be noted that Figure 8 The description is made assuming that the number of sub-lubricating layers is four, but in the embodiment of the present application, the number of sub-lubricating layers may be three or more, which is not specifically limited here.

[0155] The composite coating provided in the embodiment of the present application is well combined with the first sub-self-lubricating layer and the base layer, and then well combined with the base layer and the cover plate, and further forms a laminated structure with a certain periodicity through three or more film layers. The thickness of each sub-self-lubricating layer is relatively thin and will not fall off. The self-lubricating layer of the laminate can significantly improve the friction resistance of the composite coating, delay the failure rate and time of the composite coating, and will not affect the display, thereby effectively extending the service life of the electronic device and improving the performance.

[0156] 3. The third situation

[0157] Example 3 (reference Figures 9 to 11 ):

[0158] Figure 9 The composite coating 02 shown in Figure 6 Based on the composite coating 02 shown, Figure 10 The composite coating 02 shown in Figure 7 Based on the composite coating 02 shown, Figure 11 The composite coating 02 shown in Figure 8 The composite coating 02 shown is different in that an anti-scratch layer 4 is added between the primer layer 20 and the self-lubricating layer 5 .

[0159] It should be understood that the scratch-resistant layer 4 has certain properties. For example, the equivalent refractive index of the scratch-resistant layer 4 can range from 1.30 to 1.90, and further, the equivalent refractive index can range from 1.44 to 1.6. The transmittance of the scratch-resistant layer 4 can be greater than or equal to 91%. For example, the equivalent refractive index of the scratch-resistant layer 4 can be 1.44, 1.48, 1.50, 1.55, 1.58, or 1.6, and the transmittance of the scratch-resistant layer can be 91%, 92%, 93%, 94%, 95%, or 96%. As a result, the optical refractive index of the scratch-resistant layer can approach that of the transparent glass cover plate, so that even after adding the scratch-resistant layer, the composite coating does not affect the display effect.

[0160] In practical applications, the anti-scratch layer 4 may include a hard film and an anti-reflection film stacked in sequence, or the anti-scratch layer may include a primer film, a hard film and an anti-reflection film stacked in sequence.

[0161] The base film may be made of SiO 2 or the like, and is mainly used to enhance the bonding force between the hard film and the base layer 20 .

[0162] The material of the hard film may include at least one of a material having a refractive index greater than 1.7 and a material having a refractive index less than 1.5. Examples of high-hardness materials having a refractive index greater than 1.6 include tantalum pentoxide (Ta2O5), silicon nitride (Si3N4), carbonitride (SiC), aluminum nitride (AlN), titanium dioxide (TiO2), and the like. Materials having a refractive index less than 1.52 include SiO2, and the like. The thickness of the hard film may range from 500 nm to 4000 nm. For example, the thickness of the hard film may be 500 nm, 1000 nm, 2000 nm, 3000 nm, 3500 nm, or 4000 nm.

[0163] The material of the antireflection film can be a material with a refractive index less than 1.52, such as SiO2, and the thickness of the antireflection film can range from 20nm to 100nm. For example, the thickness of the antireflection film can be 20nm, 30nm, 50nm, 60nm, 80nm or 100nm.

[0164] Therefore, the anti-scratch layer 4 can be composed of a single layer or mixed film layer with different refractive indices to form an optical film stacked structure, which has both high hardness and anti-scratch effect and high transparency and no discoloration function.

[0165] Based on the current technology, the anti-scratch layer 4 is generally thicker, resulting in greater surface roughness, poor flatness, and increased friction resistance. As a result, the self-lubricating layer 5 attached to the anti-scratch layer 4 has a slightly weakened friction effect of the composite coating 02 compared to the one without the anti-scratch layer 4, but has enhanced anti-scratch performance. Figure 9 In the OY direction, the thickness d4 of the anti-scratch layer 4 can range from 500 nm to 4000 nm. For example, d4 can be 500 nm, 1000 nm, 2000 nm, 3000 nm, 3500 nm or 4000 nm.

[0166] In practical applications, the scratch-resistant layer can be formed by electron beam evaporation, silicon target sputtering, etc.

[0167] After the anti-scratch layer 4 is formed in the composite coating 02, the anti-scratch layer 4 can be used to increase the Vickers hardness of the composite coating 02 to greater than or equal to 1400 HV. For example, the anti-scratch layer 4 can be used to increase the Vickers hardness of the composite coating 02 to 1400 HV, 1500 HV, 1600 HV, 1700 HV, 1800 HV, or 1900 HV. Thus, the anti-scratch layer has a good hardness and scratch resistance effect.

[0168] The anti-scratch layer 4 can be used to make the Mohs hardness of the composite coating 02 greater than or equal to 7. For example, the anti-scratch layer 4 can be used to make the Mohs hardness of the composite coating 02 be 7, 8, 9, 10, 11 or 12. Therefore, the anti-scratch layer has a good hardness and scratch resistance effect.

[0169] The composite coating provided in the embodiment of the present application has a self-lubricating layer that improves the friction resistance of the composite coating, delays the failure rate and time of the composite coating, and does not affect the display. On this basis, since the anti-scratch layer can increase the hardness of the composite coating, the composite coating has a stronger scratch resistance after contacting hard objects, and has excellent puncture resistance and scratch resistance, thereby further improving the performance of the composite coating.

[0170] A vertical single-body magnetron furnace is used below, and a pure silicon target material is used to form the base layer.

[0171] Next, a silicon target or an aluminum target is used to form an anti-scratch layer.

[0172] Next, a hexagonal layered structure of LaF3 and SiO2 dual targets are used to form a self-lubricating layer, a first sub-lubricating layer, a second sub-lubricating layer, a third sub-lubricating layer and a fourth sub-lubricating layer respectively.

[0173] Before coating, the glass substrate is cleaned with deionized water; then, the glass substrate is fixed on the carrier plate of the coating machine, and the Roots pumping system is vacuumed to less than 3E through the mechanical pump. -3 pa, and then use pure argon (Ar) to plasma clean the glass substrate with a power range of 1kw to 4kw; finally, different film materials are sputtered in sequence to form different layers or films.

[0174] In order to verify the progress of the embodiments of the present application, the samples prepared in Examples 1 to 8 and Comparative Examples 1 to 2 were tested below.

[0175] The test method is as follows:

[0176] 1. Dynamic friction coefficient test:

[0177] The test instrument can be MXD-02 or other equipment of the same type and specification; the test medium can be Azov balance paper, model 1-4560-02.

[0178] Test steps:

[0179] S1. Set the load of the test instrument to 200g + / - 20g.

[0180] S2. Fix the sample on the testing instrument and start the testing instrument. The load solid moves to generate the value.

[0181] The test speed may be 100 mm / min and the test distance may be 50 mm.

[0182] S3. After removing the composite coating from the sample, wipe the glass test surface with a dust-free cloth dipped in alcohol five times and blow with an ion blower for 2 minutes.

[0183] S4. Each sample was tested 3 times.

[0184] 2. Rubber friction limit test:

[0185] The test instrument can be Tianyi Instrument T-NM-50HA, alcohol wear test machine; the test medium can be minoan eraser, standard weights.

[0186] Test steps:

[0187] S1. Visually inspect the surface of the sample to be tested to ensure there are no scratches, nicks, bubbles, cracks, peeling, or other abnormalities.

[0188] S2. Wipe the test surface of the sample with a dust-free cloth dipped in alcohol 5 times and blow with an ion blower for 2 minutes.

[0189] S3. Initial water drop angle test on the sample test surface, evenly select five test points.

[0190] S4. Use a Minoan eraser, set the weight to 1000g, the number of reciprocating cycles to 3000, the speed to 40 cycles / min, and the test stroke to 40mm.

[0191] S5. Perform a water drop angle test on three points within the area rubbed with the rubber (the rubbed area is divided into five equal parts, with one point tested in each of the three middle parts).

[0192] It should be noted that the rubber friction limit refers to the use of rubber friction composite coating to simulate the friction experience of human hands. Generally, 3000 rubber frictions are equivalent to about three months of regular user use. Under a load of 1000g, the rubber friction exceeds 18,000 times, and the service life of the surface anti-fingerprint layer is increased by up to 6 times.

[0193] 3. Vickers hardness test:

[0194] The test instrument used is Anton Paar's Step-700+NHT3+MCT3 indentation & scratch instrument equipment; the test medium uses a diamond indenter.

[0195] Test steps:

[0196] S1. Before testing, visually inspect the surface of the sample to be tested to ensure there is no abnormality, discoloration, bubbles, cracks, or peeling.

[0197] S2. Place the sample flat on the stage and adjust the height. Focus under a 100x microscope until the sample surface is clearly visible. Select the test parameters: pressure of 18 mN, hold pressure for 10 seconds, and then test.

[0198] S3. Calculate the HVIT value by substituting into the formula HV = F / A, where A is the projected area of ​​the indentation.

[0199] S4. Test 6 locations for each sample, remove the maximum and minimum values, and calculate the average value.

[0200] 4. Optical performance test:

[0201] The measuring instrument is Konica CM3600A test equipment or other equipment of the same type and specification; the light source is D65 light source; the observation angle is 10°.

[0202] Test steps:

[0203] S1. Test the VA area transmittance: 550nm wavelength, test the VA area on the front of the sample.

[0204] S2. Test the VA area reflectivity: 550nm wavelength, test the VA area on the front of the sample.

[0205] 5. Hundred grid test:

[0206] The test medium is a water bath and a grid knife.

[0207] Test steps:

[0208] S1. Before testing, visually inspect the surface of the sample to be tested to ensure there are no scratches, nicks, or peeling.

[0209] S2. Heat the purified water to 80℃±2℃ and maintain it at this temperature.

[0210] S3. Place the sample ink side up and completely immerse it in hot water. Avoid overlapping samples during the test. Boil in water for 30 minutes, remove the sample, let it stand at room temperature for 2 hours, and then cool to room temperature.

[0211] S4. Inspect the sample composite coating surface for any abnormalities and perform an adhesion test according to the method in Table 1 below. The test position must cover the ink area of ​​all light holes.

[0212] Adhesion tests were performed according to the 100-grid scratching method shown in Table 1 for different hole shapes:

[0213] It should be noted that the hundred-grid method classified as 3mm≤ink width<12mm can also refer to Figure 12 and Figure 13 .

[0214] The classification of 1mm≤ink width<3mm in the hundred-grid method can also refer to Figure 14 and Figure 15 .

[0215] Table 1

[0216]

[0217] In addition, the performance test results of the composite film layer are shown in Table 2 below:

[0218] Table 2

[0219]

[0220] As can be seen from Table 2, compared with Comparative Examples 1 to 2, Examples 1 to 8 of the present application have a smaller dynamic friction coefficient of the composite coating due to the self-lubricating layer, and a larger number of rubber friction limits, that is, the composite coating provided by the embodiments of the present application has better friction resistance.

[0221] Compared with Example 2 of the present application, when the materials and proportions of the self-lubricating layer in the composite coating are the same, the composite coating with only the self-lubricating layer has a smaller dynamic friction coefficient and a larger number of rubber friction limits than the composite coating with an anti-scratch layer added thereto. That is, the composite coating with only the self-lubricating layer has better friction resistance.

[0222] Compared to Examples 1 to 4 of the present application, only the ratio of LaF3 to SiO2 in the composite coating was changed. When the ratio of LaF3 to SiO2 was within the range of 10% to 25%, increasing the LaF3 ratio reduced the dynamic friction coefficient of the composite coating and increased the rubber friction limit, that is, the friction resistance of the composite coating was enhanced.

[0223] It should be noted that the optical performance test shows that the reflectivity of the coated glass in the light wavelength range of 380nm to 780nm is less than 8.6%, and the transmittance of the coated glass is greater than 90.5%.

[0224] The 100-grid test showed that there was no film shedding on the coated glass, and the 100-grid test was greater than or equal to 4B.

[0225] The coated glass prepared based on the embodiment of the present application has the advantages of daily anti-scratch and anti-fingerprint effectiveness for more than 18 months.

[0226] It should be understood that the above is only intended to help those skilled in the art better understand the embodiments of the present application, and is not intended to limit the scope of the embodiments of the present application. Based on the above examples, those skilled in the art can obviously make various equivalent modifications or changes. Or a combination of any two or any multiple of the above embodiments. Such modifications, changes, or combinations also fall within the scope of the embodiments of the present application.

[0227] It should also be understood that the above description of the embodiments of the present application focuses on emphasizing the differences between the various embodiments. The same or similar points that are not mentioned can be referenced with each other. For the sake of brevity, they will not be repeated here.

[0228] It should also be understood that the division of the modes, situations, categories and embodiments in the embodiments of the present application is only for the convenience of description and should not constitute a special limitation. The features of various modes, categories, situations and embodiments can be combined without contradiction.

[0229] It should also be understood that in the various embodiments of the present application, unless otherwise specified or there is a logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced to each other, and the technical features in different embodiments can be combined to form new embodiments according to their internal logical relationships.

[0230] Finally, it should be noted that the above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application shall be covered by the scope of protection of the present application. Therefore, the scope of protection of the present application shall be based on the scope of protection of the claims.

Claims

1. A composite coating, characterized in that: Applied to electronic equipment, the electronic equipment includes a cover plate, and the composite coating is provided on the light-emitting side of the cover plate; The composite coating comprises a self-lubricating layer, the self-lubricating layer is bonded to the cover plate, the material of the self-lubricating layer comprises a hexagonal layered structure compound and an inorganic oxide, and the equivalent refractive index of the self-lubricating layer ranges from 1.3 to 1.8; The hexagonal layered structure compound includes at least one of diamond-like and hexagonal layered structured rare earth fluorides; The self-lubricating layer includes at least one sub-lubricating layer, and the material of at least one of the sub-lubricating layers includes a mixture of the hexagonal layered structure compound and the inorganic oxide.

2. The composite coating according to claim 1, characterized in that The composite coating further comprises an anti-fingerprint layer, wherein the anti-fingerprint layer is arranged on a side of the self-lubricating layer away from the cover plate; The dynamic friction coefficient of the composite coating is less than or equal to 0.

03.

3. The composite coating according to claim 1, characterized in that The volume fraction of the hexagonal layered structure compound in the material of the sub-lubricating layer is in the range of 1% to 60%.

4. The composite coating according to claim 1, characterized in that The self-lubricating layer comprises at least a first sub-lubricating layer and a second sub-lubricating layer, wherein the first sub-lubricating layer is arranged between the cover plate and the second sub-lubricating layer; The material of the first sub-lubricating layer includes any one of the inorganic oxide, the hexagonal layered structure compound and the mixture of the inorganic oxide; The material of the second sub-lubricating layer includes any one of the hexagonal layered structure compound and a mixture of the hexagonal layered structure compound and the inorganic oxide.

5. The composite coating according to claim 4, characterized in that The first sub-lubricating layer and the second sub-lubricating layer are alternately arranged along a direction perpendicular to the cover plate.

6. The composite coating according to claim 4, characterized in that The self-lubricating layer further comprises at least a third sub-lubricating layer, and the third sub-lubricating layer is arranged on a side of the second sub-lubricating layer away from the first sub-lubricating layer; The material of the third sub-lubricating layer includes any one of the inorganic oxide, the hexagonal layered structure compound, and a mixture of the hexagonal layered structure compound and the inorganic oxide.

7. The composite coating according to claim 6, characterized in that At least two of the first sub-lubricating layer, the second sub-lubricating layer, and the third sub-lubricating layer are alternately arranged along a direction perpendicular to the cover plate.

8. The composite coating according to any one of claims 1 to 7, characterized in that The composite coating further includes a primer layer, which is disposed between the cover plate and the self-lubricating layer and is used to adhere the self-lubricating layer to the cover plate.

9. The composite coating according to claim 8, characterized in that The composite coating further comprises an anti-scratch layer, wherein the anti-scratch layer is arranged between the primer layer and the self-lubricating layer; The Vickers hardness of the composite coating is greater than or equal to 1400 HV; And / or, the Mohs hardness of the composite coating is greater than or equal to 7.

10. The composite coating according to claim 1, characterized in that The rare earth fluoride with a hexagonal layered structure includes at least one of lanthanum trifluoride with a hexagonal layered structure, cerium trifluoride with a hexagonal layered structure, yttrium fluoride with a hexagonal layered structure, and uranium trifluoride with a hexagonal layered structure.

11. The composite coating according to any one of claims 1-7, 9-10, characterized in that: The inorganic oxide includes at least one of an inorganic silicon oxide and an inorganic aluminum oxide.

12. A display module, characterized in that: The invention comprises a display screen, a cover plate and the composite coating according to any one of claims 1 to 11, wherein the cover plate is located on the light-emitting side of the display screen, and the composite coating is arranged on a side of the cover plate away from the display screen.

13. An electronic device, characterized in that: Comprising the display module as claimed in claim 12.

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