Under-screen NFC structure, display screen module and electronic equipment

Abstract

The invention discloses an under-screen NFC (Near Field Communication) structure, a display screen module and electronic equipment. The under-screen NFC structure comprises a metal shading plate and an NFC antenna. A hollow area is arranged on the metal shading plate, and a frame area is formed between the hollow area and the edge of the metal shading plate; the NFC antenna is arranged on the frame area in a stacked mode and covers part of the hollow area. A first ferrite layer is arranged between the frame area and the NFC antenna. According to the invention, the overall design and display performance of the display screen module are not affected while the performance of the NFC antenna under the screen is improved, and the balance between the design of the display screen module and the user experience is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic devices, and in particular to an under-screen NFC structure, a display screen module, and an electronic device. Background Art

[0002] With the continuous development of payment technology, contactless payment has gradually become a mainstream payment method due to its convenience and efficiency. To further enhance the user experience, related technologies have proposed a solution to place an NFC (near-field communication) antenna under the device screen to achieve under-screen NFC functionality.

[0003] However, the under-screen NFC solution in related technologies will affect the overall design and display performance of the screen. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: to provide an under-screen NFC structure, display screen module and electronic device, which can improve the performance of the under-screen NFC antenna while ensuring that the overall design and display performance of the display screen module are not affected, thereby achieving a balance between the display screen module design and user experience.

[0005] In order to solve the above technical problems, a technical solution adopted by the present invention is: An under-screen NFC structure, including a metal shading plate and an NFC antenna; The metal shading plate is provided with a hollow area, and a frame area is formed between the hollow area and the edge of the metal shading plate; The NFC antenna is stacked on the frame area and covers a portion of the hollow area; A first ferrite layer is provided between the frame area and the NFC antenna.

[0006] In order to solve the above technical problems, another technical solution adopted by the present invention is: A display screen module, comprising a liquid crystal display layer, a glass cover plate, and the above-mentioned under-screen NFC structure; The liquid crystal display layer is arranged on a side of the metal shading plate away from the NFC antenna; The glass cover is arranged on a side of the liquid crystal display layer away from the metal light shielding plate.

[0007] In order to solve the above technical problems, another technical solution adopted by the present invention is: An electronic device includes the above-mentioned under-screen NFC structure.

[0008] The beneficial effects of the present invention are as follows: By retaining the design of the metal shading plate in the display module, the present application provides a hollow area on the metal shading plate to reduce the shielding effect of the metal material on the magnetic field, while the retained frame area can still effectively block light leakage. The present application stacks the NFC antenna in the frame area and covers part of the hollow area. The covered hollow area reduces direct contact between the antenna and the metal, reducing the electromagnetic interference of the metal on the antenna. At the same time, the uncovered hollow area provides a penetration path for the antenna signal, ensuring that the magnetic field signal emitted by the antenna tends to a normal state. The first ferrite layer is provided between the frame area and the NFC antenna. When the frame area is too wide, it can suppress the eddy current effect generated between the metal shading plate and the NFC antenna, reducing energy loss, thereby avoiding the problem of setting the frame area too narrow to improve the performance of the NFC antenna, which leads to a decrease in screen display performance, and effectively balancing the NFC antenna performance and screen display effect. By introducing a first ferrite between the metal shading plate and the NFC antenna, the present invention improves the performance of the under-screen NFC antenna without changing the shading plate material or significantly changing the screen thickness, achieving a balance between the display module design and user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 A schematic diagram of an under-screen NFC structure provided by an embodiment of the present invention; Figure 2 A schematic structural diagram of a metal sunshade provided in an embodiment of the present invention; Figure 3 A schematic structural diagram of an NFC antenna provided in an embodiment of the present invention; Figure 4 A schematic diagram of the structure of another NFC antenna provided by an embodiment of the present invention Figure 5 A schematic structural diagram of a first ferrite layer provided in an embodiment of the present invention; Figure 6 for Figure 5 A top view including the protective housing; Figure 7 A schematic diagram of another under-screen NFC structure provided by an embodiment of the present invention; Figure 8 for Figure 7 Bottom view without metal cover; Figure 9 for Figure 8 Layered diagram of Figure 10 A schematic structural diagram of a display screen module provided by an embodiment of the present invention; Figure 11 A schematic structural diagram of an electronic device provided by an embodiment of the present invention; Description of labels: 1. Under-screen NFC structure; 11. Metal shading plate; 111. Hollow area; 112. Frame area; 1101. First vertex corner; 1102. Second vertex corner; 1121. First sub-area; 1122. Second sub-area; 12. NFC antenna; 121. Coil; 122. Extension area; 13. First ferrite layer; 14. Metal cover; 15. Second ferrite layer. 2. Display screen module; 21. Liquid crystal display screen; 22. Glass cover plate; 3. Electronic equipment. DETAILED DESCRIPTION

[0010] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0011] In the following description, specific details such as specific system structures and techniques are provided for purposes of illustration rather than limitation to facilitate a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid obscuring the description of the present application with unnecessary detail.

[0012] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections thereof.

[0013] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

[0014] Related technologies implementing under-display NFC functionality present the following issues: 1. Internal wiring within the display may interfere with the performance of the NFC antenna. For example, wiring within the LCD screen can interfere with the performance of the NFC antenna. This interference is particularly pronounced on high-resolution screens, where the denser wiring grid limits the magnetic field signal from the NFC antenna, limiting the signal to a smaller portion that can be transmitted from the screen surface, thereby reducing contactless card reading performance. 2. The screen's rear visor can also affect NFC antenna performance. To mitigate this effect, the visor is often replaced with a different material or specially designed, but these solutions can affect the overall design and display performance of the screen. For example, metal visors can generate eddy currents between the metal and the NFC antenna, significantly reducing contactless card reading performance. Alternatively, a plastic visor can be used to avoid the metal visor's interference with the antenna, but this increases the thickness of the screen. Alternatively, a non-metallic hollow area can be cut near the metal shading plate frame to reduce the impact of the metal shading plate on the non-connected antenna, but this will cause light to leak or reflect from these areas, thereby affecting the screen display effect.

[0015] In order to solve the above problems, the present application provides an under-screen NFC structure, including a metal shading plate and an NFC antenna; A hollow area is provided on the metal sunshade, and a frame area is formed between the hollow area and the edge of the metal sunshade; The NFC antenna is stacked on the border area and covers part of the hollow area; A first ferrite layer is provided between the frame area and the NFC antenna.

[0016] Among them, the metal shading plate refers to a metal plate with a shading function, and the hollow area can be formed by laser cutting, stamping or etching. The hollow area refers to the opening part of the metal shading plate where the material is removed. The shape of the opening can be rectangular, circular or polygonal, which is used to reduce the metal's obstruction to the magnetic field. The frame area refers to the continuous metal area between the hollow area and the edge of the metal shading plate. The width can be adjusted according to the shading requirements, while blocking light leakage and reducing the contact area with the NFC antenna. The stacking setting refers to the stacking arrangement of the NFC antenna and the metal shading plate in the vertical direction, which can be fixed by bonding or hot pressing so that the antenna coil plane is parallel to the surface of the shading plate. The first ferrite layer refers to a thin layer of ferrite material, which is attached to the surface of the frame area by magnetron sputtering or patch technology. The first ferrite layer is used to suppress the eddy current effect generated between the metal shading plate and the NFC antenna.

[0017] As can be seen from the above description, the present application retains the design of the metal shading plate in the display module and sets a hollow area on the metal shading plate to reduce the shielding effect of the metal material on the magnetic field, while the retained frame area can still effectively block light leakage. The present application stacks the NFC antenna in the frame area and covers part of the hollow area. The covered part of the hollow area is used to reduce the direct contact between the antenna and the metal, reducing the electromagnetic interference of the metal on the antenna. At the same time, the uncovered hollow area is used to provide a penetration path for the antenna signal to ensure that the magnetic field signal emitted by the antenna tends to a normal state. A first ferrite layer is set between the frame area and the NFC antenna. When the frame area is too wide, the eddy current effect generated between the metal shading plate and the NFC antenna can be suppressed, reducing energy loss, thereby avoiding the problem of setting the frame area too narrow to improve the performance of the NFC antenna, which leads to a decrease in screen display performance, and effectively balancing the NFC antenna performance and screen display effect. The present invention improves the performance of the NFC antenna under the screen without changing the shading plate material or significantly changing the thickness of the screen by introducing a first ferrite between the metal shading plate and the NFC antenna, thereby achieving a balance between the display module design and user experience.

[0018] In one embodiment of the present application, the metal sunshade includes a first vertex and a second vertex located on the same diagonal line; The border area includes a first sub-area and a second sub-area; The hollow area is set in the area of ​​the metal sunshade close to the first vertex corner; A first sub-region is formed between the hollow region and the edge of the first vertex corner; A second sub-area is formed between the hollow area and the edge of the second vertex corner; The NFC antenna is stacked on the first sub-area.

[0019] Among them, the first vertex and the second vertex on the same diagonal line refer to the two corner areas in the geometric shape of the metal light shielding plate at diagonal positions. The first sub-area and the second sub-area refer to the two frame parts formed after the metal light shielding plate is divided by the hollow area. Specifically, the area ratio of the two can be controlled by adjusting the size and position of the hollow area, thereby optimizing the spatial relationship between the metal light shielding plate and the NFC antenna. The NFC antenna is stacked on the first sub-area, which means that the antenna body is arranged in the frame area close to the first vertex. Specifically, it can be achieved by using a flexible circuit board or printed coil process, and eddy current interference is reduced by reducing the contact area between the antenna and the metal light shielding plate.

[0020] From the above description, it can be seen that the position of the hollow area is limited to the area of ​​the metal shading plate close to the first vertex corner, thereby forming a first sub-area closer to the first vertex corner and a second sub-area closer to the second vertex corner between the edge of the metal shading plate and the hollow area. Since the hollow area is not set at the center of the metal shading plate, there is a difference in the area of ​​the two different frame sub-areas, among which the area of ​​the first sub-area is smaller. By setting the NFC antenna on the first sub-area, the contact area between the metal shading plate and the antenna body is reduced, which reduces the interference of the metal material on the antenna magnetic field. At the same time, by limiting the hollow area to the area close to a single vertex corner, it is possible to provide sufficient working space for the NFC antenna while ensuring the screen shading performance, thereby avoiding the influence of light leakage on the display effect. Among them, the first sub-area is the main setting area of ​​the antenna, and its spacing relationship with the second sub-area formed by the second vertex corner not only maintains the overall structural strength of the metal shading plate, but also effectively isolates the negative impact of the metal material on the antenna performance through spatial division.

[0021] In one embodiment of the present application, the NFC antenna includes a multi-layer coil arranged in a same plane; The multi-layer coil is arranged at a position of the first sub-region including the first vertex.

[0022] A multi-layer coil is a spiral structure formed by multiple turns of conductive circuitry within the same plane. This can be achieved through copper foil etching or flexible circuit board winding. The first vertex refers to the corner area at the diagonal endpoints of the metal light shield. The geometric features of the border at the vertex can be utilized to maintain the mechanical strength of the metal light shield while reducing the impact of the continuous metal surface on the magnetic field.

[0023] From the above description, it can be seen that by arranging multiple layers of surrounding coils in the same plane to form an NFC antenna, the antenna structure can form a stronger magnetic field distribution in a limited space. Limiting the multi-layer coils to be arranged at the position of the first sub-area including the vertex angle can effectively utilize the discontinuous metal structure characteristics of the edge area of ​​the metal shading plate. On the one hand, by arranging the coils in the frame area close to the vertex angle, avoiding the continuous metal surface of the main area of ​​the metal shading plate, the eddy current effect is reduced; on the other hand, with the help of the structural stability of the vertex area, the deformation of the metal shading plate caused by the hollow area is avoided, thereby reducing light leakage and ensuring screen display efficiency. This setting method not only ensures the magnetic field strength required for the antenna to work, but also avoids light leakage caused by the hollow area, effectively balancing the screen display effect and antenna performance.

[0024] In one embodiment of the present application, the NFC antenna is staggered and stacked on the first sub-region, so that a portion of the NFC antenna extends beyond the edge of the metal light shielding plate to form an extended region.

[0025] Among them, the extended area of ​​the NFC antenna refers to the part of the coil conductor that exceeds the border area of ​​the metal shading plate in the plane layout. Specifically, the center of the coil can be set near the top corner to achieve this. By staggering the coil and the first sub-area of ​​the metal material, the contact area between the coil and the metal shading plate is reduced, thereby avoiding the absorption and attenuation of the electromagnetic field by the metal material.

[0026] As can be seen from the above description, the NFC antenna is offset from the first sub-area by a certain amount. Part of the NFC antenna extends beyond the edge of the metal shading plate, forming an extended area. This ensures that the NFC antenna's signal radiation direction avoids the electromagnetic shielding area of ​​the metal shading plate and the alignment of the liquid crystal display layer in the display as much as possible, thereby radiating the magnetic field at the edge of the screen and improving antenna performance.

[0027] In one embodiment of the present application, the distance between the hollow area and the edge of the first vertex is greater than or equal to 5 mm and less than or equal to 12 mm.

[0028] Among them, the distance between the hollow area and the edge of the first vertex corner refers to the minimum straight-line distance from the boundary of the hollow part in the metal shading plate to the edge of the adjacent vertex corner. It is adjusted according to the screen size and antenna layout. Without considering the shading property of the metal shading plate, the distance between the hollow area and the edge of the first vertex corner can be set to 0, that is, a groove is directly opened on the edge of the metal shading plate. By controlling this distance range, the mechanical strength of the shading plate is maintained while reducing the eddy current effect generated by the metal shading plate on the NFC antenna. The setting of this distance ensures that the metal frame area has sufficient width to block light leakage, while avoiding a significant increase in eddy current loss due to excessive metal area.

[0029] As can be seen from the above description, limiting the distance between the hollowed-out area and the edge of the metal shading plate to a certain range not only ensures the structural strength of the metal frame area, prevents deformation, and effectively blocks light from the edge of the screen, but also ensures that the direct contact area between the metal shading plate and the NFC antenna is small, effectively reducing the eddy current effect. When the spacing is less than the upper limit, it can avoid eddy current losses caused by excessive contact between the metal shading plate and the NFC antenna; when the spacing is greater than the lower limit, it can maintain the mechanical support strength of the metal shading plate. This precise dimensional control overcomes the technical obstacle of traditional designs that simply reduce the impact of metal by slotting, which makes it difficult to strike a balance between screen display effect and antenna performance.

[0030] In one embodiment of the present application, the first ferrite layer covers an area of ​​the frame region where the NFC antenna is projected.

[0031] Among them, the first ferrite layer refers to a magnetic permeability adjustment layer made of ferrite material, which can be specifically realized by coating or laminating nickel-zinc ferrite or manganese-zinc ferrite material, and its thickness is less than 1 mm. This layer suppresses the eddy current effect generated by electromagnetic induction on the metal shading plate by changing the magnetic field distribution path. The area with the NFC antenna projection in the frame area refers to the electromagnetic field coverage area formed within the metal shading plate frame when the NFC antenna is working. This area covers and ensures that the ferrite layer only acts on the key position that generates electromagnetic coupling between the antenna and the metal.

[0032] As can be seen from the above description, by placing a ferrite layer in this specific projection area, we can effectively suppress the eddy current loss caused by the metal sunshade to the antenna's magnetic field, while also avoiding the structural redundancy caused by laying ferrite material in the non-projection area. In this way, we achieve an optimal distribution of ferrite material, effectively balancing screen display quality and antenna performance.

[0033] In one embodiment of the present application, a metal cover plate is further included, and the metal cover plate is stacked on a side of the NFC antenna away from the metal light shielding plate; A second ferrite layer is provided between the metal cover and the NFC antenna.

[0034] The metal cover is a metal structural component covering the NFC antenna, which can be made of aluminum alloy stampings or magnesium alloy castings. It provides external electromagnetic shielding and mechanical support. The second ferrite layer is a permeability-adjusting layer made of ferrite material, which can be made of nickel-zinc ferrite or manganese-zinc ferrite through coating or lamination. Its high permeability suppresses the eddy current effect generated by the metal cover.

[0035] From the above description, it can be seen that the provision of the metal cover enhances the structural strength and provides external electromagnetic shielding, but as a conductor itself, it will generate eddy current effects in the alternating magnetic field, resulting in energy loss of the NFC antenna magnetic field. By providing a second ferrite layer between the metal cover and the antenna, the high magnetic permeability characteristics of the ferrite material are utilized to suppress the eddy current loss generated by the metal cover and enhance the magnetic field coupling efficiency of the antenna. This layer of ferrite and the first ferrite layer form a double magnetic circuit guiding structure above and below, allowing the antenna magnetic field to penetrate the double metal layers of the metal shading plate and the metal cover, solving the contradiction between the multi-layer metal shielding structure and the high-frequency magnetic field penetration requirements. At the same time, the introduction of the interval effectively optimizes the magnetic field distribution between the metal cover and the ferrite layer, so that the second ferrite layer can not only effectively suppress the interference of the metal cover on the antenna magnetic field, but also guide the magnetic field signal of the NFC antenna.

[0036] In one embodiment of the present application, the second ferrite layer is provided in a region of the metal cover where the NFC antenna is projected; and a gap is provided between the NFC antenna and the second ferrite layer.

[0037] The projected area refers to the vertical projection of the NFC antenna onto the metal cover surface, ensuring that the ferrite layer only covers the critical interference area corresponding to the antenna. The spacing refers to the physical gap between the NFC antenna and the second ferrite layer. This can be achieved using an insulating spacer or a raised structure on the metal cover to prevent direct contact between the ferrite layer and the antenna, which would cause excessive absorption of magnetic field energy.

[0038] From the above description, it can be seen that, firstly, the second ferrite layer is precisely set in the projection area of ​​the metal cover corresponding to the NFC antenna, which can specifically suppress the eddy current effect generated by the metal cover at the corresponding position and avoid the loss of magnetic field energy due to the metal material. Secondly, a physical gap is set between the NFC antenna and the second ferrite layer, which not only maintains the guiding effect of the ferrite material on the magnetic field, but also prevents the excessive absorption of magnetic field energy caused by the direct attachment of the ferrite layer to the antenna. This spacing design also avoids the mechanical stress problem caused by the difference in the thermal expansion coefficient of the components, ensuring the long-term stability of the antenna structure. Through the precise positioning of the projection area and the coordinated control of the spacing distance, the radiation efficiency of the antenna is maintained to the maximum extent while ensuring the magnetic field shielding effect.

[0039] Another embodiment of the present application provides a display screen module, including a liquid crystal display layer, a glass cover plate and the above-mentioned under-screen NFC structure; the liquid crystal display layer is arranged on the side of the metal shading plate away from the NFC antenna; the glass cover plate is arranged on the side of the liquid crystal display layer away from the metal shading plate.

[0040] Another embodiment of the present application provides an electronic device, including the above-mentioned under-screen NFC structure.

[0041] In one embodiment of the present application, the electronic device includes a protective shell, a circuit module, a power supply module and the above-mentioned display screen module. A storage space is provided in the protective shell, the circuit module and the power supply module are provided in the storage space, and the display screen module is provided at the opening of the storage space, so that the protective shell forms a complete closed structure.

[0042] In one embodiment of the present application, the electronic device may be a POS machine, a self-service terminal, a payment device, or the like.

[0043] The under-screen NFC structure provided by the present invention can be applied to electronic devices that require contactless payment functions, and can also be used in other electronic devices that require NFC functions. The following is an explanation of the specific implementation methods: Example 1 like Figure 1As shown, an under-screen NFC structure 1 includes a metal shading plate 11 and an NFC antenna 12. A hollow area 111 is provided on the metal shading plate 11, and a frame area 112 is formed between the hollow area 111 and the edge of the metal shading plate 11. The NFC antenna 12 is stacked on the frame area 112 and partially covers the hollow area 111. A first ferrite layer 13 is provided between the frame area 112 and the NFC antenna 12.

[0044] In some embodiments, the area of ​​the hollow region 111 is larger than the area of ​​the NFC antenna 12 .

[0045] like Figure 2 As shown, the metal shading plate 11 includes a first vertex 1101 and a second vertex 1102 located on the same diagonal line, and the frame area 112 includes a first sub-area 1121 and a second sub-area 1122. The hollow area 111 is provided in the area of ​​the metal shading plate 11 near the first vertex 1101. The first sub-area 1121 is formed between the hollow area 111 and the edge of the first vertex 1101, and the second sub-area 1122 is formed between the hollow area 111 and the edge of the second vertex 1102. The NFC antenna 12 is stacked on the first sub-area 1121.

[0046] In this embodiment, the metal light shielding plate 11 and the hollow area 111 are both rectangular, and the edge of the hollow area 111 is parallel to the edge of the metal light shielding plate 11. Since the hollow area 111 is biased towards a vertex corner of the metal light shielding plate 11, the metal light shielding plate 11 will form an L-shaped area with an extremely narrow width and an L-shaped area with a wider width based on the hollow area 111. Among them, the L-shaped area with an extremely narrow width is the first sub-area 1121 described in the present invention, and the L-shaped area with a wider width is the second sub-area 1122 described in the present invention. It should be noted that the two L-shaped areas are actually an integrated structure. Here, in order to facilitate the description of the layout setting of the NFC antenna 12, it is divided into two sub-areas.

[0047] In an optional embodiment, the hollow area 111 can also be set in the area of ​​the metal shading plate 11 close to the second vertex 1102, and correspondingly, the NFC antenna 12 is stacked on the second sub-area 1122. This application is not limited to this.

[0048] In an optional embodiment, the distance between the hollow area 111 and the edge of the first vertex 1101 is greater than or equal to 5 mm and less than or equal to 12 mm, preferably 3 mm.

[0049] In this embodiment, the distance between the hollow area 111 and the edge of the first vertex 1101 described herein refers to the width of the first sub-area 1121 , that is, the straight-line distance between the edges parallel to each other.

[0050] like Figure 3 As shown, the NFC antenna 12 includes a multi-layer coil 121 arranged in a same plane; the multi-layer coil 121 is arranged at a position where the first sub-region 1121 includes the first vertex 1101 .

[0051] In this embodiment, the NFC antenna 12 includes four layers of coils arranged in a coplanar pattern. These four layers are fabricated using an FPC (flexible printed circuit board). The multilayer coils 121 are positioned within the first sub-region 1121, including the first vertex 1101. This means that the NFC antenna 12 should cover the first vertex 1101. For example, if the first sub-region 1121 is L-shaped, the NFC antenna 12 should cover the corner of the L-shaped region.

[0052] like Figure 4 As shown, the NFC antenna 12 is staggered and stacked on the first sub-region 1121 , so that a portion of the NFC antenna 12 exceeds the edge of the metal light shielding plate 11 to form an extended region 122 .

[0053] In this embodiment, a protective housing 31 is disposed around the metal shading plate 11, and the extended area 122 of the NFC antenna 12 is located in the gap between the metal shading plate 11 and the protective housing 31. In some embodiments, the protective housing 31 is the frame of the entire electronic device.

[0054] like Figure 5 As shown, the first ferrite layer 13 covers the border area 112 where the NFC antenna 12 is projected.

[0055] In this embodiment, the coverage area of ​​the first ferrite layer 13 in the border region 112 is slightly larger than the projected area of ​​the NFC antenna 12 , thereby ensuring that the magnetic field radiated by the NFC antenna 12 can be guided, thereby reducing eddy current losses.

[0056] In this embodiment, if Figure 6 As shown, based on the different areas covered by the NFC antenna 12, the NFC antenna 12 can be divided into three parts: a first part covering the hollow area 111; a second part covering the first ferrite layer 13; and a third part covering the gap between the metal shading plate 11 and the protective shell 31.

[0057] Example 2 like Figure 7 As shown, an under-screen NFC structure 1 differs from the first embodiment in that it further includes a metal cover plate 14, which is stacked on the side of the NFC antenna 12 away from the metal shading plate 11. A second ferrite layer 15 is provided between the metal cover plate 14 and the NFC antenna 12.

[0058] In an optional embodiment, the second ferrite layer 15 is disposed in a region of the metal cover 14 where the NFC antenna 12 is projected, and a gap is provided between the NFC antenna 12 and the second ferrite layer 15 .

[0059] In this embodiment, if Figure 8 As shown, if the NFC antenna 12 is rectangular, the second ferrite layer 15 is also rectangular to ensure that the second ferrite layer 15 can completely isolate the NFC antenna 12 from contacting the metal cover 14 . Figure 9 for Figure 8 A bottom-up hierarchical diagram of Figure 8 The stacking order from bottom to top is: metal shading plate, first ferrite layer, multi-layer coil, second ferrite layer.

[0060] In an optional embodiment, if the metal cover plate 14 is replaced with another non-metal cover plate 14 (such as a plastic cover plate), the second ferrite layer 15 can be omitted.

[0061] Example 3 like Figure 10 As shown, a display screen module 2 includes a liquid crystal display layer 21, a glass cover plate 22 and the under-screen NFC structure 1 of the above-mentioned embodiment 1; the liquid crystal display layer 21 is arranged on the side of the metal shading plate 11 away from the NFC antenna 12; the glass cover plate 22 is arranged on the side of the liquid crystal display layer 21 away from the metal shading plate 11.

[0062] Among them, the corresponding content of the under-screen NFC structure 1 has been disclosed in the above part and will not be repeated here.

[0063] Example 4 like Figure 11 As shown, an electronic device 3 includes the under-screen NFC structure 1 of the first embodiment. In this embodiment, the electronic device 3 is a tablet-type payment terminal, which comprises a tablet and a payment terminal, with the tablet mounted on the payment terminal. The tablet screen is provided with the under-screen NFC structure 1, and the payment terminal base is provided below the tablet. The payment terminal base is provided with corresponding charging and information interfaces.

[0064] Among them, the corresponding content of an under-screen NFC structure has been disclosed in the above section and will not be repeated here.

[0065] In summary, the present invention provides an under-screen NFC structure, display module and electronic device, which achieves a balance between display module design and user experience by optimizing the layout of the metal shading plate and the NFC antenna. First, the hollow area on the metal shading plate reduces the shielding effect of the metal on the magnetic field, while the frame area can still effectively block light leakage to ensure the screen display effect. The NFC antenna is stacked on the frame area and covers part of the hollow area, which not only reduces the electromagnetic interference of the metal on the antenna, but also provides a signal penetration path through the uncovered hollow area. The provision of the first ferrite layer effectively suppresses the eddy current effect between the metal shading plate and the antenna, avoiding the problem of screen display performance degradation caused by the narrow frame. In addition, the hollow area is set in the area close to the top corner, and the NFC antenna composed of multiple layers of winding coils is arranged in the first sub-area, which makes full use of the discontinuous metal structure composed of the top corner edge, the first sub-area and the hollow area on the metal shading plate, reducing the eddy current effect and light leakage. The introduction of the glass cover further improves the protection performance and display effect of the structure. At the same time, the staggered stacked NFC antenna design improves the signal radiation efficiency. The second ferrite layer effectively suppresses eddy current losses in the metal cover and optimizes magnetic field distribution. By precisely controlling the distance between the cutout area and the edge of the metal sunshade, as well as the placement and spacing of the ferrite layers, this solution significantly improves the performance of the under-display NFC antenna without changing the sunshade material or significantly altering the screen thickness, while maintaining the display quality and structural stability.

[0066] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's description and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An under-screen NFC structure, characterized in that: Includes metal visor and NFC antenna; The metal shading plate is provided with a hollow area, and a frame area is formed between the hollow area and the edge of the metal shading plate; The NFC antenna is stacked on the frame area and covers a portion of the hollow area; A first ferrite layer is provided between the frame area and the NFC antenna.

2. The under-screen NFC structure according to claim 1, characterized in that: The metal sunshade includes a first vertex and a second vertex located on the same diagonal line; The frame area includes a first sub-area and a second sub-area; The hollow area is provided in an area of ​​the metal shading plate close to the first vertex corner; The first sub-area is formed between the hollow area and the edge of the first vertex; The second sub-area is formed between the hollow area and the edge of the second vertex; The NFC antenna is stacked on the first sub-area.

3. The under-screen NFC structure according to claim 2, characterized in that: The NFC antenna includes a multi-layer coil arranged in a same plane; The multi-layer coil is disposed at a position in the first sub-region including the first vertex.

4. The under-screen NFC structure according to claim 2 or 3, characterized in that: The NFC antenna is staggered and stacked on the first sub-area, so that a portion of the NFC antenna extends beyond the edge of the metal light shielding plate to form an extended area.

5. The under-screen NFC structure according to claim 2, characterized in that: A distance between the hollow area and the edge of the first vertex angle is greater than or equal to 5 mm and less than or equal to 12 mm.

6. The under-screen NFC structure according to claim 1, characterized in that: The first ferrite layer covers an area of ​​the frame region where the NFC antenna is projected.

7. The under-screen NFC structure according to claim 1, characterized in that: It also includes a metal cover plate, which is stacked on a side of the NFC antenna away from the metal shading plate; A second ferrite layer is provided between the metal cover and the NFC antenna.

8. The under-screen NFC structure according to claim 7, characterized in that: The second ferrite layer is provided in an area of ​​the metal cover where the NFC antenna is projected; There is a gap between the NFC antenna and the second ferrite layer.

9. A display screen module, characterized in that: It comprises a liquid crystal display layer, a glass cover plate, and an under-screen NFC structure according to any one of claims 1 to 8; The liquid crystal display layer is arranged on a side of the metal shading plate away from the NFC antenna; The glass cover is arranged on a side of the liquid crystal display layer away from the metal light shielding plate.

10. An electronic device, characterized in that: It includes an under-screen NFC structure according to any one of claims 1 to 8.

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