Electronic device

Abstract

The invention relates to an electronic device. The electronic equipment comprises a metal middle frame and a display screen, wherein the metal middle frame comprises a middle plate and a frame, the frame is arranged on the periphery of the middle plate in a surrounding mode, the middle plate comprises two opposite sides, and the display screen is arranged on one side of the middle plate; the frame comprises a bottom frame and a top frame which are opposite to each other and two side frames which are opposite to each other, a main radiator of the high-frequency antenna is formed on the bottom frame, and a parasitic branch knot of the high-frequency antenna is formed on one side frame; a first electric connecting piece is arranged between the metal middle frame and the display screen, the first electric connecting piece is arranged in a first preset range near a main radiator of the high-frequency antenna, and the first electric connecting piece is electrically connected with the metal middle frame. According to the electronic equipment provided by the embodiment of the invention, the high-frequency antenna performance in the bottom antenna can be ensured.

Description

Technical Field

[0001] This application relates to the field of wireless communication technologies, and in particular, to an electronic device. Background Art

[0002] In an electronic device, the radiator of an antenna can generally be disposed on the metal frame of the electronic device. The metal frame of the electronic device may include a top frame and a bottom frame that are oppositely disposed, and two side frames that are oppositely disposed. In practical applications, radiators of low-frequency antennas, intermediate-frequency antennas, and high-frequency antennas can be disposed on the bottom frame and the side frames, and these antennas can be collectively referred to as bottom antennas.

[0003] Among them, the performance of the high-frequency antenna in the bottom antenna is affected by various aspects, making it difficult to ensure the performance of the high-frequency antenna. Currently, how to ensure the performance of the high-frequency antenna in the bottom antenna has become an urgent problem to be solved. Summary of the Invention

[0004] Based on this, in view of the above technical problems, it is necessary to provide an electronic device that can ensure the performance of the high-frequency antenna in the bottom antenna.

[0005] In a first aspect, this application provides an electronic device, which includes a metal middle frame and a display screen; wherein, the metal middle frame includes a middle plate and a frame, the frame surrounds the middle plate, the middle plate includes two opposite sides, and the display screen is disposed on one side of the middle plate; the frame includes a bottom frame and a top frame that are opposite to each other and two side frames that are opposite to each other, the bottom frame is formed with a main radiator of the high-frequency antenna, and one of the side frames is formed with a parasitic branch of the high-frequency antenna; a first electrical connector is disposed between the metal middle frame and the display screen, the first electrical connector is disposed within a first preset range near the main radiator of the high-frequency antenna, and the first electrical connector is electrically connected to the metal middle frame.

[0006] The electronic device provided by the embodiment of the present application includes a metal middle frame and a display screen. Among them, the metal middle frame includes a middle plate and a frame. The bottom frame in the frame forms the main radiator of the high-frequency antenna, and one of the side frames forms the parasitic branch of the high-frequency antenna. In addition, a first electrical connector is provided between the metal middle frame and the display screen. The first electrical connector is arranged within a first preset range near the main radiator of the high-frequency antenna, and the first electrical connector is electrically connected to the metal middle frame. On the one hand, by arranging the parasitic branch of the high-frequency antenna on the side frame, the bandwidth of the high-frequency antenna can be extended, and then the radiation efficiency of the high-frequency antenna can be improved. On the other hand, since there is a cavity between the display screen and the metal middle frame, this cavity will produce a resonant cavity effect, causing obvious radiation absorption in the high-frequency band, and then generating spurious resonances in the high-frequency band, affecting the radiation performance of the high-frequency antenna. In the electronic device provided by the embodiment of the present application, a first electrical connector can be provided between the metal middle frame and the display screen. Among them, the first electrical connector is arranged within a first preset range near the main radiator of the high-frequency antenna, that is, the first electrical connector is arranged in an area with relatively high high-frequency radiation energy. At the same time, the first electrical connector is electrically connected to the metal middle frame. In this way, the cavity environment can be changed, so as to avoid generating spurious resonances in the high-frequency band, and then the radiation performance of the high-frequency antenna can be ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments of the present application or related technologies. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0008] Figure 1 Schematic diagram of an electronic device in one embodiment;

[0009] Figure 2 Schematic diagram of the current distribution on the surface of the display screen in one embodiment;

[0010] Figure 3 Schematic diagram of the installation positions of the first electrical connector and the third electrical connector in one embodiment;

[0011] Figure 4 Schematic diagram of the surface current distribution of the display screen after the first electrical connector and the third electrical connector are installed in one embodiment;

[0012] Figure 5 Schematic diagram of the antenna radiator arranged in the frame in one embodiment;

[0013] Figure 6Schematic diagram of an antenna radiator arranged in a frame in an embodiment;

[0014] Figure 7 Schematic diagram of comparison of radiation efficiency of a high - frequency antenna with and without parasitic stubs in an embodiment;

[0015] Figure 8 Schematic diagram of comparison of antenna performance in an embodiment. Detailed implementation manners

[0016] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be 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 the present application and are not used to limit the present application.

[0017] The metal middle frame is an important component in electronic devices such as mobile phones. Generally speaking, the metal middle frame can include a middle plate and a frame. The frame surrounds the middle plate. The frame is usually rectangular in shape and can include a top frame and a bottom frame arranged oppositely, as well as two side frames arranged oppositely. The middle plate includes two opposite sides, one side of which can be equipped with a display screen, and the other side can be equipped with a bottom case.

[0018] Currently, the design solution of arranging the antenna radiator on the frame has become the mainstream. In practical applications, the radiators of low - frequency antennas, medium - frequency antennas and high - frequency antennas can be arranged on the bottom frame and side frames. These antennas can be collectively referred to as bottom antennas.

[0019] Among them, the performance of the high - frequency antenna in the bottom antenna is affected by many aspects, making it difficult to ensure the performance of the high - frequency antenna. Currently, how to ensure the performance of the high - frequency antenna in the bottom antenna has become an urgent problem to be solved.

[0020] In view of this, an embodiment of the present application provides an electronic device, which includes a metal middle frame and a display screen. The metal middle frame includes a middle plate and a frame. A main radiator of a high-frequency antenna is formed on the bottom frame of the frame, and a parasitic stub of the high-frequency antenna is formed on one of the side frames. In addition, a first electrical connector is provided between the metal middle frame and the display screen. The first electrical connector is disposed within a first preset range near the main radiator of the high-frequency antenna, and the first electrical connector is electrically connected to the metal middle frame. On the one hand, by providing the parasitic stub of the high-frequency antenna on the side frame, the bandwidth of the high-frequency antenna can be extended, thereby improving the radiation efficiency of the high-frequency antenna. On the other hand, since there is a cavity between the display screen and the metal middle frame, the cavity will produce a resonance cavity effect, causing significant radiation absorption in the high-frequency band, and then generating parasitic resonance in the high-frequency band, affecting the radiation performance of the high-frequency antenna. In the electronic device provided by the embodiment of the present application, a first electrical connector can be provided between the metal middle frame and the display screen. The first electrical connector is disposed within a first preset range near the main radiator of the high-frequency antenna, that is, the first electrical connector is disposed in an area with relatively high high-frequency radiation energy. At the same time, the first electrical connector is electrically connected to the metal middle frame. In this way, the cavity environment can be changed, thereby avoiding the generation of parasitic resonance in the high-frequency band, and then ensuring the radiation performance of the high-frequency antenna.

[0021] Please refer to Figure 1 , which shows a schematic diagram of the electronic device provided by the embodiment of the present application. It should be noted that the electronic device provided by the embodiment of the present application can be, for example, a mobile phone, a tablet computer, a wearable device, an Internet of Things device, a vehicle-mounted device, etc. The embodiment of the present application does not limit the type of the electronic device.

[0022] The electronic device provided by the embodiment of the present application may include a metal middle frame and a display screen. In an alternative embodiment of the present application, the display screen may be, for example, an OLED (Organic Light-Emitting Diode) display screen, an LCD (Liquid Crystal Display) display screen, etc. The embodiment of the present application does not limit the type of the display screen.

[0023] Among them, the metal middle frame includes a middle plate and a frame. In an alternative embodiment of the present application, both the middle plate and the frame may be made of metal. In Figure 1 , the middle plate is disposed in a plane parallel to the paper surface, the frame surrounds the middle plate, the frame includes opposite bottom frames 101 and top frames 102 and opposite two side frames 103 and 104, the middle plate includes opposite two sides, one side faces outward towards the paper surface, the other side faces inward towards the paper surface, the display screen is disposed on one side of the middle plate, and the bottom case of the electronic device is disposed on the other side of the middle plate.

[0024] In an alternative embodiment of the present application, the bottom border 101 forms the main radiator of the high-frequency antenna, and one of the side borders forms the parasitic stub of the high-frequency antenna. In an alternative embodiment of the present application, the parasitic stub of the high-frequency antenna may be formed on the side border 103 or on the side border 104. For the sake of convenience of description, hereinafter, only the case where the parasitic stub of the high-frequency antenna is formed on the side border 103 is taken as an example for illustration. The case where the parasitic stub of the high-frequency antenna is formed on the side border 104 is the same, and the embodiments of the present application will not elaborate on this any further.

[0025] In an alternative embodiment of the present application, a first electrical connector may be provided between the metal middle frame and the display screen. Optionally, the first electrical connector may be provided between the middle plate and the display screen. The first electrical connector is disposed within a first preset range near the main radiator of the high-frequency antenna. The first electrical connector is electrically connected to the metal middle frame. Optionally, the first electrical connector may be electrically connected to the middle plate. It should be noted that the above-mentioned first preset range can be set according to actual situations. The description "the first electrical connector is disposed within a first preset range near the main radiator of the high-frequency antenna" means that the installation position of the first electrical connector is near the main radiator of the high-frequency antenna.

[0026] In practical applications, the display screen of an electronic device is usually connected to an FPC (Flexible Printed Circuit Board). Devices such as the driving circuit of the display screen and the display IC (Integrated Circuit) are provided on the FPC. Generally, the FPC is disposed between the display screen and the middle plate in a form that bends backward. Since it is necessary to accommodate the FPC and the devices on the FPC, and at the same time, it is necessary to ensure a certain safety distance between the FPC and the display screen and the middle plate, there is generally a cavity between the display screen and the metal middle frame. Since the FPC is generally located at the bottom of the display screen, the position of this cavity is close to the position of the bottom antenna. This cavity will produce a resonant cavity effect, causing obvious radiation absorption in the high-frequency band, and then generating spurious resonances in the high-frequency band, affecting the radiation performance of the high-frequency antenna.

[0027] Please refer to Figure 2 , which shows the current distribution on the surface of the display screen. The current distribution on the surface of the display screen can intuitively reflect the cavity characteristics of the cavity. Among them, Figure 2 the area indicated by the red arrow in is the area with stronger current. It can be seen that the areas with stronger current are all near the bottom border, which can fully reflect the influence of the cavity on the bottom antenna, especially on the high-frequency antenna.

[0028] To avoid the influence of the cavity on the high-frequency antenna, in the electronic device provided by the embodiment of the present application, a first electrical connector may be provided between the metal middle frame and the display screen. Optionally, the first electrical connector may be provided between the middle plate and the display screen. Among them, the first electrical connector is arranged within a first preset range near the main radiator of the high-frequency antenna, that is, the first electrical connector is arranged in an area with relatively high high-frequency radiation energy. At the same time, the first electrical connector is electrically connected to the metal middle frame. Optionally, the first electrical connector may be electrically connected to the middle plate. In an optional embodiment of the present application, the first electrical connector may be, for example, a conductive foam.

[0029] By setting the first electrical connector, the size of the resonant cavity can be controlled, the cavity environment can be changed, so that the cavity generates parasitic resonance outside the high-frequency band, and parasitic resonance in the high-frequency band is avoided, thereby ensuring the radiation performance of the high-frequency antenna. In addition, since the first electrical connector is arranged in an area with relatively high high-frequency radiation energy, the effect of the first electrical connector on changing the cavity environment can be ensured, and thus the radiation performance of the high-frequency antenna can be ensured.

[0030] In addition, in an optional embodiment of the present application, a third electrical connector may also be provided between the metal middle frame and the display screen. Optionally, the third electrical connector may be provided between the middle plate and the display screen. The third electrical connector is electrically connected to the metal middle frame and the display screen respectively. Optionally, the third electrical connector may be electrically connected to the middle plate and the display screen respectively. In an optional embodiment of the present application, the first electrical connector may be, for example, a conductive foam.

[0031] By setting the third electrical connector, the size of the resonant cavity can be further controlled, the cavity environment can be changed, so that the cavity generates parasitic resonance outside the high-frequency band, and parasitic resonance in the high-frequency band is avoided, thereby ensuring the radiation performance of the high-frequency antenna.

[0032] In an optional embodiment of the present application, the third electrical connector may be arranged within a third preset range near the target area of the display screen, where the target area is the area where the surface current of the display screen is greater than the preset current threshold. In other words, the target area is the area where the surface current of the display screen is relatively strong. Please return for reference Figure 2 , the target area may be Figure 2 the area indicated by the red arrow in

[0033] Placing the third electrical connector near the area with stronger surface current can ensure the effect of the third electrical connector on changing the cavity environment, thereby ensuring the radiation performance of the high-frequency antenna.

[0034] In an alternative embodiment of the present application, the number of the third electrical connectors can be two, and the two third electrical connectors are respectively arranged close to different side frames. It should be noted that in practical applications, the number of the third electrical connectors can be more than two or less than two, and the embodiments of the present application do not specifically limit it.

[0035] In an alternative embodiment of the present application, the third electrical connector can be arranged outside the orthographic projection area of the FPC. Since the third connector is arranged outside the orthographic projection area of the FPC, it can be directly electrically connected to the display screen without being blocked by the FPC. In this way, it can be ensured that the third electrical connector can be electrically connected to both the metal middle frame and the display screen, thereby ensuring the effect of the third electrical connector on changing the cavity environment, and further ensuring the radiation performance of the high-frequency antenna. Of course, since the first electrical connector needs to be arranged within a first preset range near the main radiator of the high-frequency antenna, it is bound to be located within the orthographic projection area of the FPC. Due to the blockage of the FPC, it cannot be electrically connected to the display screen. As a second choice, in the embodiments of the present application, it can only be ensured that it is electrically connected to the metal middle frame.

[0036] Please refer to Figure 3 , which shows a schematic diagram of the installation positions of the first electrical connector and the third electrical connector. As shown in Figure 3 , two third electrical connectors are respectively arranged at positions 1 and 2 shown in it, and as shown in Figure 3 , the first electrical connector is arranged at position 3 shown in it.

[0037] Please refer to Figure 4 , which shows a schematic diagram of the surface current distribution of the display screen after the first electrical connector and the third electrical connector are arranged. As shown in Figure 4 , after the first electrical connector and the third electrical connector are arranged, there are no obvious aggregation hotspots on the surface current of the display screen, that is, there is no area with obvious stronger surface current. At the same time, the direction of the current is also relatively uniform and consistent, which reflects that the environment of the cavity has been improved as expected. Therefore, the above-mentioned effects can be achieved, and then the radiation performance of the high-frequency antenna can be ensured.

[0038] After explaining the electrical connectors arranged between the metal middle frame and the display screen, below, the embodiments of the present application will explain the radiator of the antenna arranged on the frame.

[0039] Please refer to Figure 5 and Figure 6, in an alternative embodiment of the present application, a first coupling slot f1 may be formed in the bottom border 101, and a second coupling slot f2 may be formed in one of the side borders (for example, the side border 103). In an alternative embodiment of the present application, the first coupling slot f1 may be, for example, an interface such as a USB (Universal Serial Bus) interface of the electronic device.

[0040] Among them, the first coupling slot f1 divides the bottom border 101 into a first bottom border segment 1011 and a second bottom border segment 1012, and the second coupling slot f2 divides the side border 103 where it is located into a first side border segment 1031 and a second side border segment 1032. The first bottom border segment 1011 is connected to the first side border segment 1031.

[0041] In an alternative embodiment of the present application, the main radiator of the high-frequency antenna is formed on the second bottom border segment 1012, and the parasitic stub of the high-frequency antenna is formed on the second side border segment 1032.

[0042] Please continue to refer to Figure 5 and Figure 6 , in an alternative embodiment of the present application, the second bottom border segment 1012 includes a first grounding point j1, and the first grounding point j1 is grounded. In an alternative embodiment of the application, the first grounding point j1 may be grounded through the metal middle frame. In an alternative embodiment of the present application, the length of the border segment between the first grounding point j1 and the first coupling slot f1 may be 11.7 mm.

[0043] In an alternative embodiment of the present application, the second side border segment 1032 includes a second grounding point j2, and the second grounding point j2 is grounded. In an alternative embodiment of the application, the second grounding point j2 may be grounded through the metal middle frame. In an alternative embodiment of the present application, the length of the border segment between the second grounding point j2 and the second coupling slot f2 may be 14 mm.

[0044] In an alternative embodiment of the present application, the first bottom border segment 1011 includes a feeding point k and a third grounding point j3. Among them, the feeding point k is connected to the feed source Feed, and the third grounding point j3 is grounded. In an alternative embodiment of the application, the third grounding point j3 may be grounded through the metal middle frame. In an alternative embodiment of the present application, the feeding point k is arranged close to the first coupling slot f1, and the third grounding point j3 is arranged close to the first side border segment 1031. In an alternative embodiment of the present application, the third grounding point j3 is arranged at the corner position between the first side border segment 1031 and the first bottom border segment 1011.

[0045] In an alternative embodiment of the present application, the length of the border segment between the feeding point k and the first coupling slot f1 may be 17.1 mm, the length of the border segment between the feeding point k and the third grounding point j3 may be 15.8 mm, the length between the third grounding point j3 and the end of the bottom border 101 close to the side border 103 may be 10.5 mm, and the length of the first side border segment 1031 may be 22.6 mm.

[0046] In an alternative embodiment of the present application, the border segment between the first grounding point j1 and the first coupling slot f1 is the main radiator of the high-frequency antenna, the border segment between the second grounding point j2 and the second coupling slot f2 is the parasitic stub of the high-frequency antenna, the first bottom border segment 1011 and the first side border segment 1031 are the radiators of the low-frequency antenna, and the border segment between the third grounding point and j3 the first coupling slot f1 is the radiator of the intermediate-frequency antenna.

[0047] By setting the parasitic stub of the high-frequency antenna on the side border 103, the bandwidth of the high-frequency antenna can be extended, and then the radiation efficiency of the high-frequency antenna can be improved. Please refer to Figure 7 , which shows a comparison diagram of the radiation efficiency of the high-frequency antenna with and without the parasitic stub set, as Figure 7 shown, when the parasitic stub is set, the radiation efficiency of the high-frequency antenna (B41 band) can be increased by 2.5 dB.

[0048] Please refer to Figure 6 , in an alternative embodiment of the present application, a matching circuit is provided between the feed source Feed and the feeding point k, wherein the matching circuit is used to switch between the low-frequency antenna and the intermediate-frequency antenna.

[0049] In an alternative embodiment of the present application, the matching circuit includes a switching switch SW and four matching branches connected to the switching switch. Among them, the four matching branches are the first matching branch, the second matching branch, the third matching branch, and the fourth matching branch. The switching switch SW can be a single-pole four-throw switch (SP4T), and the switching switch SW is used to select and connect the first matching branch, the second matching branch, the third matching branch, and the fourth matching branch.

[0050] Among them, in an alternative embodiment of the present application, the first matching branch may include an inductor of 39 nh. Optionally, it is used to support the B8 band. The second matching branch may include an inductor of 18 nh. Optionally, it is used to support the B5 band. The third matching branch may include an inductor of 6.8 nh. Optionally, it is used to support the B28 band. The fourth matching branch may include a shunt capacitor of 2 pf. Optionally, it is used to support the B1 or B3 band.

[0051] In an alternative embodiment of the present application, the matching circuit may further include a capacitor of 8.2 pF, a capacitor of 1.8 pF, an inductor of 3.9 nH, and another capacitor of 1.8 pF. Among them, the capacitor of 8.2 pF is connected to the inductor of 3.9 nH, and a capacitor of 1.8 pF is disposed between the capacitor of 8.2 pF and the inductor of 3.9 nH. One end of the capacitor of 1.8 pF is respectively connected to the capacitor of 8.2 pF and the inductor of 3.9 nH, and the other end is grounded. Another capacitor of 1.8 pF is respectively connected to the inductor of 3.9 nH and the feeding point k.

[0052] It should be noted that the capacitance of the capacitors and the inductance value of the inductors described above are exemplary. In actual applications, other capacitance values and inductance values can be set, and the embodiments of the present application do not specifically limit them.

[0053] In an alternative embodiment of the present application, another matching circuit connected to the main radiator of the high-frequency antenna may also be provided. The matching circuit may be provided with different matching branches, and the B40 band and the B41 band can be switched by turning on different matching branches.

[0054] Please refer to Figure 5 and Figure 6 , in an alternative embodiment of the present application, a grounding inductor is provided near the first coupling gap f1 in the second bottom frame segment 1012. The grounding inductor is used to adjust the frequency offset of the high-frequency band, and the grounding inductor may be, for example, 5.1 nH.

[0055] In an alternative embodiment of the present application, another grounding inductor may be provided between the third grounding point j3 and the ground. The grounding inductor is used to adjust the low-frequency frequency offset.

[0056] In an alternative embodiment of the present application, a second electrical connector may further be provided between the metal middle frame and the display screen. Optionally, the second electrical connector may be disposed between the middle plate and the display screen. Among them, optionally, the second electrical connector is disposed within a second preset range near the radiator of the low-frequency antenna, that is, the second electrical connector is disposed in an area with higher low-frequency radiation energy. The second electrical connector is electrically connected to the metal middle frame, and optionally, the second electrical connector may be electrically connected to the middle plate. In an alternative embodiment of the present application, the second electrical connector may be a conductive foam.

[0057] Among them, similar to the above description, the second preset range can be set according to actual situations. The description "the second electrical connector is disposed within a second preset range near the radiator of the low-frequency antenna" means that the installation position of the second electrical connector is near the radiator of the low-frequency antenna.

[0058] Setting the second electrical connector near the area with higher low-frequency radiation energy can ensure the effect of the second electrical connector on changing the cavity environment. By changing the cavity environment, spurious resonances can be generated outside the low-frequency band of the cavity, while avoiding spurious resonances in the low-frequency band, thereby ensuring the radiation performance of the low-frequency antenna.

[0059] It should be noted that, in an alternative embodiment of the present application, the second electrical connector can be disposed outside the orthographic projection area of the FPC. When the second electrical connector is disposed outside the orthographic projection area of the FPC, in addition to being electrically connected to the metal middle frame, the second electrical connector can also be electrically connected to the display screen. In this way, the effect of changing the cavity environment can be further ensured.

[0060] Please refer to Figure 8 , which shows a comparison schematic diagram of the high-frequency antenna performance in the cases of adding parasitic stubs, adding grounds, that is, adding electrical connectors (including the first electrical connector, the second electrical connector, and the third electrical connector), and neither adding parasitic stubs nor adding grounds. As Figure 8 shown, after adding the electrical connectors, the radiation efficiency of the high-frequency 2.5 - 2.7 GHz part is more averaged overall, the efficiency at the 2.6 GHz frequency point is increased by 0.5 dB, the overall high-frequency efficiency is increased by 0.4 dB, and the overall bandwidth performance is the best.

[0061] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as within the scope recorded in the present application.

[0062] The above-described embodiments merely represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. An electronic device, characterized in that, The electronic device includes a metal middle frame and a display screen; Wherein, the metal middle frame includes a middle plate and a border, the border surrounds the middle plate, the middle plate includes two opposite sides, and the display screen is disposed on one side of the middle plate; The border includes a bottom border and a top border which are opposite to each other and two side borders which are opposite to each other. The bottom border forms a main radiator of a high-frequency antenna, and one of the side borders forms a parasitic stub of the high-frequency antenna; A first electrical connector is disposed between the metal middle frame and the display screen. The first electrical connector is disposed within a first preset range near the main radiator of the high-frequency antenna, and the first electrical connector is electrically connected to the metal middle frame.

2. The electronic device according to claim 1, wherein The bottom border is provided with a first coupling slit, and one of the side borders is provided with a second coupling slit; Wherein, the first coupling slit divides the bottom border into a first bottom border segment and a second bottom border segment, the second coupling slit divides the side border where it is located into a first side border segment and a second side border segment, and the first bottom border segment is connected to the first side border segment; The main radiator of the high-frequency antenna is formed on the second bottom border segment, and the parasitic stub of the high-frequency antenna is formed on the second side border segment.

3. The electronic device according to claim 2, wherein The second bottom border segment includes a first grounding point which is grounded, the second side border segment includes a second grounding point which is grounded, the first bottom border segment includes a feeding point and a third grounding point, the feeding point is connected to a feed source, the third grounding point is grounded, the feeding point is disposed near the first coupling slit, and the third grounding point is disposed near the first side border segment; The border segment between the first grounding point and the first coupling slit is the main radiator of the high-frequency antenna; The border segment between the second grounding point and the second coupling slit is the parasitic stub of the high-frequency antenna; The first bottom border segment and the first side border segment are radiators of a low-frequency antenna; The border segment between the third grounding point and the first coupling slit is the radiator of an intermediate-frequency antenna.

4. The electronic device according to claim 3, characterized in that A second electrical connector is further disposed between the metal middle frame and the display screen; The second electrical connector is disposed within a second preset range near the radiator of the low-frequency antenna, and the second electrical connector is electrically connected to the metal middle frame.

5. The electronic device according to claim 3, wherein A matching circuit is disposed between the feed source and the feeding point, and the matching circuit is used for switching between the low-frequency antenna and the intermediate-frequency antenna.

6. The electronic device according to claim 5, characterized in that, The matching circuit includes a switching switch and a first matching branch, a second matching branch, a third matching branch and a fourth matching branch which are connected to the switching switch; The switching switch is used for selecting and connecting the first matching branch, the second matching branch, the third matching branch and the fourth matching branch. Wherein, the first matching branch is used for supporting the B8 band, the second matching branch is used for supporting the B5 band, the third matching branch is used for supporting the B28 band, and the fourth matching branch is used for supporting the B1 or B3 band.

7. The electronic device according to claim 3, characterized in that, A grounding inductor is disposed near the first coupling slit on the second bottom border segment, and the grounding inductor is used for adjusting the frequency offset of the high-frequency band.

8. The electronic device according to any one of claims 1 to 7, characterized in that, A third electrical connector is further disposed between the metal middle frame and the display screen, and the third electrical connector is electrically connected to the metal middle frame and the display screen respectively.

9. The electronic device according to claim 8, wherein, The third electrical connector is disposed within a third preset range near a target area of the display screen, and the target area is an area where the surface current of the display screen is greater than a preset current threshold.

10. The electronic device according to claim 9, wherein The number of the third electrical connectors is two, and the two third electrical connectors are respectively disposed close to different side frames.

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