Under-screen NFC structure

Abstract

The embodiment of the utility model discloses an under-screen NFC (Near Field Communication) structure. The under-screen NFC structure comprises a display module and an NFC coil, the display module comprises a current-conducting plate, the NFC coil is arranged on the rear side of the current-conducting plate, the current-conducting plate is provided with a hollow area and a fracture, the NFC coil covers the hollow area, one end of the fracture is communicated with the hollow area, and the other end of the fracture extends to the edge of the current-conducting plate. According to the utility model, by reducing the area of the current-conducting plate covering the NFC coil, the current-conducting plate is prevented from blocking the radiation of the NFC coil, and the capability of the NFC coil radiating to the surface of the screen end of the display module is improved; by disconnecting the closing structure of the conductive plate, the conductive plate near the NFC coil is prevented from generating an eddy current effect when the NFC coil works, the eddy current effect is prevented from influencing the radiation performance of the NFC coil, and the induction performance of NFC under the screen is remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of display technology, and in particular to an under-display NFC structure. Background Technology

[0002] With the development of technology, contactless identity recognition and data transmission have become daily needs in life and production. NFC, as a traditional near-field transmission method, is widely used. In the POS and PDA fields, in order to improve the convenience and experience of users' card swiping transactions, the under-display NFC front-facing card swiping transaction function is evolving into a core technology for various terminals to compete for the market. How to improve the sensing performance of under-display NFC is a key technical problem to be solved in this field. Utility Model Content

[0003] This utility model discloses an under-display NFC structure to solve the problem of improving the sensing performance of under-display NFC.

[0004] This utility model embodiment provides an under-display NFC structure, including: a display module and an NFC coil; the display module includes a conductive plate, the NFC coil is disposed on the rear side of the conductive plate, the conductive plate is provided with a cutout area and a break, the NFC coil covers the cutout area, one end of the break is connected to the cutout area, and the other end of the break extends to the edge of the conductive plate.

[0005] Furthermore, the display module includes a reflective sheet disposed on the front side of the conductive plate, and the reflective sheet is made of a non-conductive material.

[0006] Furthermore, the cutout area is located near the top or bottom edge of the conductive plate.

[0007] Furthermore, the hollowed-out area is composed of a through-hole structure.

[0008] Furthermore, the break is located on the side with the shortest distance between the edge of the hollowed-out area and the edge of the conductive plate.

[0009] Furthermore, at least one edge of the hollow area coincides with the edge of the conductive plate, and the portion where the edge of the hollow area coincides with the edge of the conductive plate is the break.

[0010] Furthermore, the top edge of the hollow area coincides with the top edge of the conductive plate, or the bottom edge of the hollow area coincides with the bottom edge of the conductive plate, or any side edge of the hollow area coincides with the side edge of the conductive plate.

[0011] Furthermore, the display module is provided with a backlight frame, which is connected to the edge of the conductive plate. The backlight frame and the conductive plate together form the outer shell of the display module for fixing the components inside the display module.

[0012] Furthermore, the fracture surface is greater than or equal to 0.2 mm.

[0013] Furthermore, the conductive plate is made of metal.

[0014] As can be seen from the technical solution, the embodiments provided by this utility model have the following advantages: the conductivity of the conductive plate dissipates the static electricity generated by the display module, thereby improving the anti-static performance of the display module; by reducing the area of ​​the conductive plate covering the NFC coil, the conductive plate is prevented from blocking the radiation of the NFC coil, thereby improving the ability of the NFC coil to radiate to the screen surface of the display module; by setting a break to disconnect the closed structure of the conductive plate, the eddy current effect generated by the conductive plate near the NFC coil when the NFC coil is working is prevented, thereby avoiding the eddy current effect from affecting the radiation performance of the NFC coil. Therefore, this embodiment significantly improves the sensing performance of under-screen NFC. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a partial side view of an embodiment of an under-display NFC structure provided in this utility model.

[0017] Figure 2 This is a schematic diagram of the conductive plate and the hollow area structure of an under-display NFC structure embodiment three provided in this utility model embodiment;

[0018] Figure 3 This is a schematic diagram of the conductive plate and fracture structure of an under-display NFC structure embodiment three provided in this utility model;

[0019] Figure 4 This is a schematic diagram of the conductive plate and NFC coil assembly structure of an under-display NFC structure embodiment three provided in this utility model embodiment;

[0020] Figure 5 This is a schematic diagram of the conductive plate edge perforation structure of an under-display NFC structure embodiment three provided in this utility model embodiment;

[0021] Figure 6This is a schematic diagram of the equal width structure of the edge and break of the conductive plate hollow area in the third embodiment of the under-display NFC structure provided in this utility model embodiment;

[0022] Figure 7 This is a schematic diagram of eddy current generation in a conductive plate of an under-display NFC structure provided in an embodiment of this utility model;

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Display module; 2. Conductive plate; 21. Cutout area; 22. Break; 201. Snap-in hole; 202. Perforation; 203. Conductive frame; 3. NFC coil; 10. Backlight frame; 101. Convex buckle; 11. Reflective sheet; 12. Light guide plate; 13. LCD panel; 14. Touch screen; 15. Display end face; Y, Break width. Detailed Implementation

[0025] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0029] It should be understood that although the steps in the flowcharts of the accompanying figures are shown sequentially as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the accompanying figures may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

[0030] This utility model embodiment discloses an under-display NFC structure.

[0031] In this embodiment, the NFC coil 3 is attached to the back of the display module 1 and can be applied to POS and PDA fields. When applied in a real-world scenario, users only need to place a magnetic card or other sensing object on the screen of the device to easily achieve efficient sensing interaction with the NFC coil. This operation process closely matches the user's visual and operational habits when using the device. When performing critical business such as payment and data transmission, users can naturally and smoothly complete NFC sensing operations while focusing on screen information, significantly improving the convenience and efficiency of the operation.

[0032] In addition to enabling the under-display NFC front-facing card swiping function, the under-display NFC structure in this embodiment also needs to comply with NFC financial authentication (EMVCO PCD). The authentication indicators for NFC financial authentication include NFC sensing distance and sensing strength. The smaller the sensing distance between the card and the NFC coil, the better, and the greater the sensing strength, the better.

[0033] To achieve a thinner and lighter design for the product, and to ensure the anti-static performance of display module 1, please refer to [link to relevant documentation]. Figure 1 An embodiment of an under-display NFC structure provided in this utility model includes: a display module 1 and an NFC coil 3; the display module 1 includes a conductive plate 2, and the NFC coil 3 is disposed on the rear side of the conductive plate 2.

[0034] In a more specific embodiment, the display module 1 is provided with a backlight adhesive frame 10, which is connected to the edge of the conductive plate 2. The backlight adhesive frame 10 and the conductive plate 2 together form the outer shell of the display module 1 to fix the components inside the display module 1. It can be understood that in existing display modules, the backlight adhesive layer includes a backlight adhesive frame 10 and a backlight adhesive plate. The bottom of the backlight adhesive frame 10 is connected to the edge of the backlight adhesive plate and is integrally formed to fix the components inside the display module 1. In specific implementation, this embodiment replaces the original backlight adhesive plate with the conductive plate 2, while retaining the backlight adhesive frame 10. The bottom of the backlight adhesive frame 10 is connected to the edge of the conductive plate 2, so that the backlight adhesive layer and the conductive layer of the display module 1 are integrated, effectively reducing the overall thickness of the product. Furthermore, without changing the distance between the NFC coil 3 and the display module 1, the conductive layer is brought closer to the display module 1, improving the anti-static performance of the display module 1.

[0035] In a more specific embodiment, the backlight frame 10 is provided with a convex buckle 101, and a conductive frame 203 perpendicular to the conductive plate 2 is connected to the edge of the conductive plate 2. The conductive frame 203 is provided with a locking hole 201 that engages with the convex buckle 101. It can be understood that, in specific implementation, the backlight frame 10 and the conductive frame 203 are assembled by engaging the convex buckle 101 of the backlight frame 10 with the locking hole 201 of the conductive frame 203.

[0036] In some more specific embodiments, the bottom of the backlight frame 10 is provided with a protrusion, and the edge of the conductive plate 2 is provided with a through hole 202, such as... Figure 5 As shown, the protrusion and the through hole 202 are interference-fitted. It can be understood that, in specific implementations, the protrusion at the bottom of the backlight frame 10 is pressed into the through hole 202 on the edge of the conductive plate 2, thus achieving a fixed connection between the backlight frame 10 and the conductive plate 2, eliminating the need for the conductive frame 203 and saving material; alternatively, the backlight frame 10 can be formed on the edge of the conductive plate 2 through in-mold injection molding, with a portion of the material of the backlight frame 10 embedded into the through hole 202 on the edge of the conductive plate 2, ultimately forming a structure where the backlight frame 10 and the conductive plate 2 are connected as one unit, achieving a tight connection between the backlight frame 10 and the edge of the conductive plate 2.

[0037] Since this embodiment requires NFC sensing on the screen surface, the conductive plate 2 is placed in front of the NFC coil 3. The conductive plate 2 changes the distribution of the magnetic field, causing the magnetic field lines to concentrate on the surface of the conductive plate 2 and making it difficult to diffuse to a distance. As a result, the magnetic field radiated by the NFC coil is confined to the vicinity of the conductive plate 2 and cannot effectively propagate to the display end face 15, thus playing a role in blocking radiation. When the electromagnetic waves of the NFC coil 3 encounter the conductive plate 2, some of the energy is reflected back and cannot continue to propagate forward, thereby reducing the electromagnetic wave energy that can continue to be radiated through the conductive plate 2. Therefore, the NFC coil 3 is blocked from radiation by the conductive plate 2.

[0038] In a more specific embodiment, please refer to Figure 2 and Figure 4 To address the issue of the NFC coil 3's radiation being blocked by the conductive plate 2, this embodiment provides a cutout area 21 on the conductive plate 2, which is covered by the NFC coil 3. It is understood that, in practical implementation, while ensuring the anti-static performance of the conductive plate 2, the area covered by the conductive plate 2 on the NFC coil 3 is minimized to prevent the conductive plate 2 from blocking the NFC coil 3's radiation.

[0039] It should be noted that the NFC coil 3 covers the cutout area 21 of the conductive plate 2, including but not limited to the NFC coil 3 being directly attached to the surface of the conductive plate 2 or the NFC coil 3 being attached to the surface of the housing behind the NFC coil that carries the entire display module, as long as the NFC coil 3 completely covers the cutout area 21 in space.

[0040] In a more specific embodiment, the cutout area 21 is formed by a through-hole structure.

[0041] It should be noted that the shape of the through hole is not limited and can be round, square, irregular, etc.

[0042] Understandably, in practice, the cutout area 21 consists of only one through-hole structure, so as to minimize the area covered by the conductive plate 2 on the NFC coil 3 and improve the radiation intensity of the NFC coil 3.

[0043] In addition to blocking the radiation from the NFC coil 3, conductive plate 2 also generates eddy currents in the conductive plate 2 when the alternating magnetic field generated by the NFC coil 3 encounters it, according to Faraday's law of electromagnetic induction. Figure 7 As shown, eddy currents generate an electromagnetic field opposite to the direction of the incident electromagnetic field, thereby weakening the magnetic field generated by the NFC coil, or even completely canceling the original magnetic field to a certain extent, thus blocking the propagation of radiation. Even though the area of ​​the conductive plate 2 covering the NFC coil 3 has been reduced in the above embodiment, eddy currents will still be generated by the conductive plate 2 near the NFC coil 3 when the NFC coil 3 is working, such as... Figure 7 As shown.

[0044] In a more specific embodiment, please refer to Figure 3 To address the issue of eddy currents still being generated on the conductive plate 2 near the NFC coil 3, this embodiment provides a break 22 on the conductive plate 2. One end of the break 22 is connected to the hollow area 21, and the other end of the break 22 extends to the edge of the conductive plate 2.

[0045] Understandably, in practice, by setting the break 22 to disrupt the closed structure of the conductive plate 2 around the NFC coil 3, it is possible to prevent the conductive plate 2 near the NFC coil 3 from forming closed eddy currents when the NFC coil 3 is working, thus avoiding the eddy current effect from affecting the radiation performance of the NFC coil 3.

[0046] It should be noted that the break 22 in this embodiment can be set on any narrow side of the upper, left and right sides of the hollow area 21, which can avoid the generation of eddy currents in the conductive plate 2 around the NFC coil 3. At the same time, the area of ​​the conductive plate 2 material removed is small, reducing the risk of affecting the anti-static performance of the display module 1 due to the removal of part of the conductive plate 2.

[0047] In a more specific embodiment, please refer to Figure 3 The width Y of the fracture 22 is greater than or equal to 0.2mm.

[0048] Understandably, in practical implementation, limiting the width of the fracture 22 to greater than or equal to 0.2 mm ensures that the fracture 22 does not stick together, thus more effectively breaking the closed loop of the eddy current. If the size of the fracture 22 is too small, under the skin effect, the current can bypass the fracture 22 along a thin layer at its edge on the surface of the conductor, thus continuing to form an approximately closed path, making it impossible to effectively block the eddy current. At the edge of the fracture 22, the distribution of the electric and magnetic fields becomes uneven. This unevenness causes the current distribution at the edge to change, i.e., the edge effect. Therefore, at the fracture 22 of the conductive plate 2 frame, the edge effect makes it easier for the current to flow along the edge of the fracture 22, continuing to form an eddy current path, making it impossible to completely block the eddy current.

[0049] In a more specific embodiment, the break 22 is located on the side with the shortest distance between the edge of the hollow area 21 and the edge of the conductive plate 2. It is understood that, in specific implementation, this avoids the generation of eddy currents in the conductive plate 2 around the NFC coil 3, while the area of ​​the removed conductive plate 2 material is minimized, so as to hardly affect the antistatic performance of the display module 1.

[0050] In a more specific embodiment, the cutout area 21 is disposed on the upper part of the conductive plate 2, and the cutout 22 is disposed on any one of the narrow sides of the upper, left and right sides of the cutout area 21. The narrow sides of the upper, left and right sides are of equal width, that is, the distances from the upper, left and right sides of the cutout area 21 to the edge of the conductive plate 2 are all equal.

[0051] In a more specific embodiment, at least one edge of the hollow area 21 coincides with the edge of the conductive plate 2, and the part where the edge of the hollow area 21 coincides with the edge of the conductive plate 2 is the break 22.

[0052] Understandably, in specific implementations, at least one side of the cutout area 21 extends to the edge of the conductive plate 2. In this case, the cutout area 21 acts as a notch in the conductive plate 2, ensuring that no closed conductive material surrounds the cutout area 21. This prevents the formation of closed eddy currents in the conductive plate 2 near the NFC coil 3 when the NFC coil 3 is operating, thus avoiding the eddy current effect from affecting the radiation performance of the NFC coil 3. It should be understood that the overlapping edge of the cutout area 21 and the conductive plate 2 is equivalent to the break 22. Maximizing the width of the break 22 minimizes the impact of the eddy current effect. Simultaneously, the cutout area 21 is positioned at the edge of the conductive plate 2 to maximize the antistatic area of ​​the conductive plate 2.

[0053] In a more specific embodiment, the edge of any one side of the cutout area 21 coincides with the edge of the conductive plate 2; in some more specific embodiments, the edges of any two adjacent sides of the cutout area 21 coincide with the edge of the conductive plate 2.

[0054] In a more specific embodiment, please refer to Figure 6 The top edge of the cutout area 21 coincides with the top edge of the conductive plate 2. It can be understood that in the specific implementation, the NFC coil 3 covers the cutout area 21, and the top edge of the NFC coil 3 also coincides with the top edge of the conductive plate 2. The NFC coil is closer to the top of the display module 1.

[0055] In some more specific embodiments, the bottom edge of the cutout area 21 coincides with the bottom edge of the conductive plate 2. It can be understood that, in a specific implementation, the NFC coil 3 covers the cutout area 21, and the bottom edge of the NFC coil 3 also coincides with the bottom edge of the conductive plate 2. The NFC coil is closer to the bottom of the display module 1.

[0056] In some more specific embodiments, the side edge of either side of the cutout area 21 coincides with the side edge of the conductive plate 2.

[0057] In a more specific embodiment, the NFC coil 3 and the cutout area 21 are disposed near the top or bottom edge of the conductive plate 2.

[0058] Understandably, in practice, by placing the NFC coil 3 on the top or bottom of the conductive plate 2, that is, on the top or bottom of the display module 1, it can be placed on the top or bottom of the display screen when using objects such as magnetic cards for sensing. This avoids objects from obscuring the display information in the middle of the display screen as much as possible, and can better free up space under the screen to place other components, making the under-screen structure layout more reasonable.

[0059] In a more specific embodiment, the display module 1 includes a reflective sheet 11 disposed on the front side of the backlight adhesive layer of the display module 1, and the reflective sheet 11 is made of a non-conductive material.

[0060] Understandably, in practice, non-metallic materials are used for the reflector 11 to avoid the metal materials blocking the radiation of the NFC coil 3 and generating eddy current effects.

[0061] In a more specific embodiment, the material of the reflective sheet 11 includes PET (polyethylene terephthalate) or PC (polycarbonate), etc. PET reflective sheets have excellent optical properties; their high reflectivity effectively reflects light and reduces light loss. Simultaneously, PET material possesses excellent mechanical properties, such as high strength and good toughness, making it less prone to damage during processing and use. Furthermore, PET material exhibits good chemical stability, resisting corrosion from acids, alkalis, and other chemicals, maintaining good performance in various environments. In addition, it has good dimensional stability, maintaining its shape and size over long-term use, thus ensuring stable optical performance of the backlight module in the display module. PC reflective sheets have high light transmittance and reflectivity, providing excellent optical performance. This material has outstanding heat resistance, operating normally without deformation at high temperatures, making it advantageous in backlight modules with high heat dissipation requirements or where localized high temperatures may occur. PC material also has good flame retardancy, increasing product safety. Furthermore, its excellent toughness and impact resistance allow it to withstand a certain degree of external impact without breaking, contributing to improved reliability and lifespan of the backlight module in the display module.

[0062] In a more specific embodiment, the conductive plate 2 is made of metal.

[0063] Understandably, in practical implementation, based on the stable conductivity and high conductivity of metal materials, using metal materials to make conductive plate 2 can improve the antistatic performance of display module 1, and its conductivity is less affected by other materials and temperature.

[0064] In addition to enabling the under-display NFC front-side card swiping function, the under-display NFC structure in this embodiment also enhances the radiation capability of the NFC coil 3 by opening a cutout area 21 in the conductive plate 2 and allowing the reflective sheet 11 in the display module 1 to sample non-metallic materials, thereby achieving a sensitive sensing effect and complying with NFC financial authentication (EMVCO PCD).

[0065] It should be noted that the terms used to describe positional relationships in the above examples and accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. The various embodiments of this utility model described above are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. An under-display NFC structure, characterized in that, include: The display module (1) and the NFC coil (3) are shown. The display module (1) includes a conductive plate (2). The NFC coil (3) is disposed on the rear side of the conductive plate (2). The conductive plate (2) is provided with a hollow area (21) and a break (22). The NFC coil (3) covers the hollow area (21). One end of the break (22) is connected to the hollow area (21), and the other end of the break (22) extends to the edge of the conductive plate (2).

2. The under-display NFC structure according to claim 1, characterized in that, The display module (1) includes a reflective sheet (11), which is disposed on the front side of the conductive plate (2) and is made of a non-conductive material.

3. The under-display NFC structure according to claim 1, characterized in that, The cutout area (21) is located near the top or bottom edge of the conductive plate (2).

4. An under-display NFC structure according to claim 1 or 3, characterized in that, The hollow area (21) is composed of a through hole structure.

5. The under-display NFC structure according to claim 4, characterized in that, The break (22) is located on the side with the shortest distance between the edge of the hollow area (21) and the edge of the conductive plate (2).

6. The under-display NFC structure according to claim 5, characterized in that, At least one edge of the hollow area (21) coincides with the edge of the conductive plate (2), and the part where the edge of the hollow area (21) coincides with the edge of the conductive plate (2) is the break (22).

7. The under-display NFC structure according to claim 6, characterized in that, The top edge of the hollow area (21) coincides with the top edge of the conductive plate (2), or the bottom edge of the hollow area (21) coincides with the bottom edge of the conductive plate (2), or any side edge of the hollow area (21) coincides with the side edge of the conductive plate (2).

8. The under-display NFC structure according to claim 1, characterized in that, The display module (1) is provided with a backlight frame (10), which is connected to the edge of the conductive plate (2). The backlight frame (10) and the conductive plate (2) together form the outer shell of the display module (1) for fixing the components inside the display module (1).

9. The under-display NFC structure according to claim 1, characterized in that, The fracture surface (22) is greater than or equal to 0.2 mm.

10. The under-display NFC structure according to claim 1, characterized in that, The conductive plate (2) is made of metal.

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