Screen assembly structure, screen assembly method, and electronic device

Abstract

The present application provides a screen assembly structure, a screen assembly method, and an electronic device. In the screen assembly structure, on the basis of providing a back adhesive between a screen and a middle plate portion of a middle frame, a characteristic adhesive is further additionally provided between the screen and the middle plate portion, the characteristic adhesive and the back adhesive are both close to the edge of the screen, and the back adhesive and the characteristic adhesive are spaced apart. The characteristic adhesive is made of an adhesive material having a specific modulus, and has a loss factor greater than 0.3 and a loss modulus greater than 30 MPa, such that the characteristic adhesive has characteristics such as high shear bonding strength and high energy consumption. The characteristic adhesive and the back adhesive cooperate with each other to jointly bond the screen to the middle plate portion, so that the bonding strength between the screen and the middle plate portion can be increased. Moreover, when an electronic device is in risk scenarios such as falling and collision, the characteristic adhesive can suppress the vibration of the screen and consume the impact energy received by the middle frame. In addition, the vibration damping and energy absorption effect of the adhesive can significantly reduce the probability of problems such as small bright points, local damage, and cracks on the screen, thereby effectively protecting the screen from being damaged, and further improving the reliability and service life of the screen.

Description

Screen assembly structure, screen assembly method and electronic equipment

[0001] This application claims priority to Chinese Patent Application No. 202411516194.0, filed on October 28, 2024, entitled “Screen Assembly Structure, Screen Assembly Method and Electronic Device”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of electronic product technology, and in particular to a screen assembly structure, screen assembly method and electronic device. Background Technology

[0003] Currently, a large number of users still experience broken screens on electronic devices (such as mobile phones) manufactured by various companies. Specifically, electronic devices often experience screen cracks due to drops, impacts, or other reasons during use. Therefore, the drop resistance of electronic devices still needs improvement. Summary of the Invention

[0004] This application provides a screen assembly structure and assembly method, as well as an electronic device. The screen assembly structure improves the screen's shock absorption and drop resistance, making the screen more reliable and reducing the probability of screen breakage.

[0005] The first aspect of this application provides a screen assembly structure, including: a middle frame, including a middle plate portion and a frame portion, the frame portion surrounding the periphery of the middle plate portion; a screen, supported on the middle plate portion; an adhesive backing, disposed between the back of the screen and the middle plate portion, and close to the edge of the screen; and a special adhesive, disposed between the back of the screen and the middle plate portion, close to the edge of the screen, and spaced apart from the adhesive backing; wherein the special adhesive has a loss factor greater than 0.3 and a loss modulus greater than 30 MPa.

[0006] The screen assembly structure provided in this application, in addition to the back adhesive between the screen and the middle plate of the mid-frame, also includes a special adhesive between the screen and the middle plate. Both the special adhesive and the back adhesive are located near the edge of the screen and are spaced apart. The special adhesive uses a specific modulus material with a loss factor greater than 0.3 and a loss modulus greater than 30 MPa, giving it characteristics such as high shear bond strength and high energy dissipation. The special adhesive, together with the back adhesive, bonds the screen to the middle plate, increasing the bond strength between the screen and the middle plate and improving the stability and reliability of the screen. Simultaneously, in high-risk scenarios such as drops and collisions, the special adhesive can suppress screen vibration and dissipate the impact energy received by the mid-frame. Combined with the vibration damping and energy absorption effect of the back adhesive, this significantly reduces the probability of screen breakage, localized damage, cracks, and other problems, effectively protecting the screen from damage and further improving its reliability and lifespan.

[0007] In one possible implementation, the elastic modulus of the special adhesive is 80MPa-120MPa.

[0008] In this way, the adhesive has a high elastic modulus, ensuring sufficient shear strength and effectively suppressing screen vibration and preventing screen slippage. Simultaneously, the elastic modulus is not excessively high, ensuring sufficient adhesion for reliable bonding between the screen and the frame. This also keeps the ratio of the adhesive's loss modulus to its elastic modulus within a suitable range, meeting the requirements for the adhesive's loss factor.

[0009] In one possible implementation, the shear bond strength of the special adhesive is greater than 5 MPa.

[0010] In this way, the adhesive has high bonding strength, ensuring a reliable bond between the screen and the mid-frame. Simultaneously, the adhesive's high shear strength significantly suppresses screen vibration and effectively prevents screen movement.

[0011] In one possible implementation, the gap between the special adhesive and the backing adhesive is 2mm-5mm.

[0012] In this way, the special adhesive and the backing adhesive have a certain gap, which can prevent them from sticking together and allow them to function stably and reliably. Furthermore, the close spacing between the special adhesive and the backing adhesive allows them to work together effectively to provide shock absorption, vibration damping, and energy dissipation prevention.

[0013] In one possible implementation, the adhesive includes a top section and a side section, the top section being disposed near the top edge of the screen and covering at least both top ends of the screen, and the side section being disposed near the side edge of the screen and covering at least a portion of the side edge of the screen.

[0014] In this way, the adhesive can avoid the flexible circuit boards, chips, and other components located at the bottom of the screen. Furthermore, the top and side sections of the adhesive provide good protection for the top and left and right sides of the screen. Specifically, by ensuring that the top section of the adhesive covers at least both ends of the top of the screen, it effectively protects the two top corners of the screen from damage, especially in scenarios where electronic devices are most susceptible to corner drops.

[0015] In one possible implementation, the upper end of the side segment is connected to the top segment, and the lower end of the side segment extends to the bottom edge near the screen.

[0016] In this way, the side sections of the adhesive form a continuous, integral structure that completely covers the sides of the screen. The adhesive provides complete protection for the two top corners and the left and right sides of the screen, preventing damage to these areas and effectively protecting the screen's integrity.

[0017] In one possible implementation, the top segment completely covers the top of the screen.

[0018] In this way, the adhesive provides complete protection for the top and left and right sides of the screen. Even in scenarios where electronic devices are dropped from corners or edges, the adhesive can effectively protect the screen from damage, providing more comprehensive and complete impact protection.

[0019] In one possible implementation, the adhesive also includes a bottom section disposed near the bottom edge of the screen and extending a predetermined distance from the side of the screen toward the center of the screen.

[0020] In this way, the bottom edge of the adhesive does not completely cover the bottom edge of the screen, avoiding the central area of ​​the bottom edge and thus preventing damage to flexible circuit boards, chips, and other components at the bottom of the screen. Furthermore, in scenarios where electronic devices are dropped from their bottom corners, the bottom edge of the adhesive provides better protection for the bottom corners of the screen, offering more comprehensive protection for the screen's integrity.

[0021] In one possible implementation, the adhesive backing surrounds the periphery of the characteristic adhesive.

[0022] In this way, the screen is pre-fixed to the middle plate of the frame mainly by the adhesive backing, ensuring the stability of the screen's adhesion. The special adhesive located on the inside of the adhesive backing further enhances the adhesion strength between the screen and the frame. Furthermore, by placing the adhesive backing closest to the edge of the screen, it can effectively prevent moisture, dust, and other foreign objects from entering the electronic device.

[0023] In one possible implementation, the color of the adhesive is black.

[0024] The color of the sealant is usually black. By matching the color of the special adhesive with that of the sealant, the screen assembly structure of the electronic device will have a more uniform color and a simpler appearance after disassembly.

[0025] In one possible implementation, the screen includes: a display module; and a cover plate disposed on a side surface of the display module opposite to the middle plate portion.

[0026] In this way, the display module, as the core structure of the screen, is used to display images, text, and other information. The cover plate is placed on the front of the display module to protect it from scratches or bumps, and also to prevent moisture, dust, and other foreign objects from entering the display module from the front of the screen.

[0027] In one possible implementation, it further includes: side sealing adhesive, disposed on the side wall of the display module, the side sealing adhesive at least covering the location of the sound outlet of the screen and avoiding the bottom edge of the screen.

[0028] In this way, the side sealant can protect the sidewalls of the display module. In risk scenarios such as drops and collisions of electronic devices, the side sealant absorbs impact energy through its own elastic deformation, preventing problems such as bright spots, local damage or cracks at the edges of the screen, protecting the integrity of the screen and improving its reliability.

[0029] By covering the sound outlet area of ​​the screen with side sealant, moisture, dust, and other foreign objects can be prevented from entering the display module through the sound outlet. Furthermore, by avoiding the bottom edge of the screen, the side sealant prevents the flexible circuit board extending from the bottom fold of the screen from being obstructed.

[0030] In one possible implementation, a protective seam is provided between the sidewall of the screen and the frame portion, and the screen assembly structure further includes: a sealant, which fills the protective seam and is disconnected at the location of the sound outlet seam.

[0031] In this way, sealant can be used to seal and protect the entire electronic device, preventing external dust, moisture, grease, and other foreign objects from entering the display module through the protective seam, thus ensuring the display module's operational performance. Furthermore, in high-risk scenarios such as drops or collisions, the sealant can deform and absorb impact force through its own cushioning effect, protecting the screen. Specifically, by avoiding the location of the sound outlet seam, the sealant can prevent it from blocking the sound outlet and ensure its proper functioning.

[0032] In one possible implementation, side sealant covers the location of the sound outlet seam on the screen, and the screen assembly structure also includes: dammed adhesive, located on both sides of the sound outlet seam, and connecting the sealant and the side sealant.

[0033] In this way, the sealant and side sealant are connected by the damming adhesive, and the sealant, side sealant, and damming adhesive together form a complete protective layer around the screen. This provides both more thorough sealing and more comprehensive impact protection, thereby improving the screen's reliability and lifespan.

[0034] In one possible implementation, a step portion extends from the side of the bezel facing the screen, the step portion protrudes from the side of the middle plate facing the screen, and the step portion is located at least at the bottom edge of the screen; the step portion is located on the outside of the display module, the cover plate overlaps the step portion, and a step adhesive is provided between the cover plate and the step portion.

[0035] By creating a stepped section on the bezel, the cover plate overlaps the stepped section, avoiding the formation of a protective seam between the screen and the bezel. Furthermore, the cover plate can be bonded to the stepped section using step adhesive, which securely connects the cover plate to the stepped section and seals the gap between the screen and the bezel, preventing dust, moisture, and other foreign objects from entering the display module and improving the overall reliability of the electronic device.

[0036] In one possible implementation, the side sealant covers the top and sides of the display module, the step sealant covers the bottom edge of the screen, and the screen assembly structure further includes a dam sealant located at both ends of the bottom edge of the screen and connecting the step sealant and the side sealant.

[0037] In this way, the side sealant, step sealant, and dam sealant form a complete protection around the screen, which can provide more comprehensive impact protection and more thorough sealing protection, thereby improving the screen's reliability and service life.

[0038] A second aspect of this application provides a screen assembly method, comprising: providing a screen with an adhesive backing; applying a special adhesive to the backing of the screen, such that the special adhesive and the adhesive backing are spaced apart; and attaching the screen to the middle plate of a mid-frame.

[0039] The screen assembly method provided in this application is used to assemble a screen onto a mid-frame to form the aforementioned screen assembly structure. Therefore, the screen assembly structure assembled using this method possesses all the technical effects of the aforementioned screen assembly structure, which will not be elaborated further here.

[0040] In one possible implementation, before attaching the screen to the middle plate of the mid-frame, the method further includes applying sealant to the edge portion of the mid-frame.

[0041] In one possible implementation, after the screen is attached to the middle plate of the mid-frame, the process further includes: curing sealant and special adhesive to securely attach the screen to the mid-frame.

[0042] A third aspect of this application provides an electronic device including a back cover and a screen assembly structure as described above, wherein the back cover is connected to the side of the mid-frame opposite to the screen.

[0043] The electronic device provided in this application includes the aforementioned screen assembly structure. Therefore, the electronic device possesses all the technical effects of the aforementioned screen assembly structure, which will not be elaborated here. Attached Figure Description

[0044] Figure 1 is a schematic diagram of the structure of the electronic device provided in an embodiment of this application;

[0045] Figure 2 is an exploded view of the electronic device shown in Figure 1;

[0046] Figure 3 is a plan view of a screen assembly structure provided in an embodiment of this application;

[0047] Figure 4 is a partial cross-sectional view of the screen assembly structure in Figure 3 at point AA;

[0048] Figure 5 is a partial cross-sectional view of the screen assembly structure in Figure 3 at point BB;

[0049] Figure 6 is a plan view of another screen assembly structure provided in an embodiment of this application;

[0050] Figure 7 is a partial cross-sectional view of the screen assembly structure in Figure 6 at point C;

[0051] Figure 8 is a schematic diagram of the third screen assembly structure provided in the embodiment of this application;

[0052] Figure 9 is an exploded view of the screen assembly structure in Figure 8;

[0053] Figure 10 is an exploded view of the screen assembly structure in Figure 8 after the screen has been removed.

[0054] Figure 11 is a partial cross-sectional view of the screen assembly structure in Figure 8 at point DD in Figure 9;

[0055] Figure 12 is another possible cross-sectional view of the screen assembly structure provided in the embodiment of this application;

[0056] Figure 13 is a front view of the screen assembly structure in Figure 8 after the screen has been removed;

[0057] Figure 14 is a front view of the fourth screen assembly structure provided in the embodiment of this application after the screen is removed;

[0058] Figure 15 is a front view of the fifth screen assembly structure provided in the embodiment of this application after the screen has been removed;

[0059] Figure 16 is a flowchart of the screen assembly method provided in the embodiment of this application.

[0060] Explanation of reference numerals in the attached diagram: 10-Electronic device; 100-Screen; 101-Black border; 110-Display module; 120-Cover plate; 200-Housing; 210-Middle frame; 220-Back cover; 211-Middle plate; 212-Frame; 2121-Step section; 300-Main board; 400-Battery; 500-Camera; 610-Back adhesive; 620-Side sealing adhesive; 630-Step adhesive; 640-Damage adhesive; 650-Sealing adhesive; 660-Specialty adhesive; 661-Top section; 662-Side section; 663-Bottom section. Detailed Implementation

[0061] The terminology used in the implementation section of this application is for the purpose of explaining specific embodiments of this application only, and is not intended to limit this application.

[0062] This application provides an electronic device, which can be a consumer electronics product. Exemplary examples include, but are not limited to, mobile phones, portable Android devices (PADs), laptops, laptop computers, netbooks, ultra-mobile personal computers (UMPCs), walkie-talkies, point-of-sale (POS) machines, personal digital assistants (PDAs), multimedia players, e-book readers, in-vehicle devices, wearable devices, virtual reality (VR) devices, and augmented reality (AR) devices. Wearable devices include, but are not limited to, smart bracelets, smartwatches, smart head-mounted displays, and smart glasses.

[0063] Figure 1 is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Referring to Figure 1, taking a mobile phone as an example, the electronic device 10 may include a screen 100 and a housing 200. One side surface of the screen 100 is used to display images, text, and other information; this side surface is typically defined as its front surface, and the opposite side surface is its back surface. The housing 200 surrounds the periphery and back surface of the screen 100, providing support, fixation, and protection for the screen 100. The front surface of the screen 100 is exposed outside the housing 200, allowing the user to view the content displayed on the screen 100 or perform input operations on the electronic device 10.

[0064] Figure 2 is an exploded structural view of the electronic device shown in Figure 1. Referring to Figure 2, the housing 200 of the electronic device 10 may include a middle frame 210 and a back cover 220. The middle frame 210 is connected between the screen 100 and the back cover 220. The screen 100 is supported on one side surface of the middle frame 210, and the back cover 220 is connected to the other side surface of the middle frame 210.

[0065] The screen 100 is typically mounted integrally on the mid-frame 210 to ensure its strength and stability, and to meet its usage requirements. The back cover 220 is usually connected to the mid-frame 210 by overlapping. The mid-frame 210 and the back cover 220 together form a receiving cavity, which is used to install components such as the motherboard 300, battery 400, camera 500, and speaker (not shown in the figure).

[0066] The mid-frame 210 may include a mid-plate portion 211 and a border portion 212. The mid-plate portion 211 is located between the screen 100 and the back cover 220, and the border portion 212 surrounds the periphery of the mid-plate portion 211. For example, the border portion 212 may extend perpendicularly to the plate surface of the mid-plate portion 211 to both sides of the mid-plate portion 211. Exemplarily, the border portion 212 and the mid-plate portion 211 may be an integrally formed structure.

[0067] The screen 100 is mounted on the middle plate 211 of the middle frame 210. The middle plate 211 supports the screen 100, ensuring it is stable and secure, giving it sufficient strength to withstand frequent pressure. The frame 212 surrounds the screen 100, protecting its sides and helping it withstand impacts, drops, and other risks, preventing damage.

[0068] The edge of the back cover 220 is connected to the side frame portion 212 of the middle frame 210, for example, the edge of the back cover 220 is bonded to the side frame portion 212. There is a gap between the middle plate portion 211 of the middle frame 210 and the back cover 220, which forms a receiving cavity as described above, for mounting devices within the receiving cavity between the middle plate portion 211 of the middle frame 210 and the back cover 220.

[0069] It should be noted that, in the diagram, electronic device 10 is taken as a candybar electronic device (such as a candybar mobile phone), and the screen 100 of the candybar electronic device can be a rigid screen. Of course, electronic device 10 can also be a foldable electronic device (such as a foldable mobile phone), and the screen 100 of the foldable electronic device can be a flexible screen.

[0070] The following description uses a candybar-type electronic device 10 as an example. Specifically, it mainly describes the structure of the screen 100 and the middle frame 210 assembled together. For ease of description, this embodiment defines the overall structure of the screen 100 and the middle frame 210 assembled together as the screen assembly structure.

[0071] Figure 3 is a plan view of a screen assembly structure provided in an embodiment of this application. Figure 4 is a partial cross-sectional view of the screen assembly structure in Figure 3 at point AA. Figure 5 is a partial cross-sectional view of the screen assembly structure in Figure 3 at point BB.

[0072] Referring to Figures 3 and 4, the screen 100 may include a stacked display module 110 and a cover plate 120. The display module 110 is located on the side of the screen 100 near the middle plate portion 211 of the middle frame 210. The front of the display module 110 is used to display images, text, and other information, and the back of the display module 110 is adhered to the middle plate portion 211 by adhesive 610. The cover plate 120 covers the front of the display module 110 to protect it from scratches or bumps, and also prevents moisture, dust, and other foreign objects from entering the display module 110 from the front of the screen 100, ensuring the normal operation of the display module 110.

[0073] The area of ​​the cover plate 120 is typically slightly larger than the area of ​​the display module 110. The orthographic projection of the display module 110 onto the cover plate 120 lies entirely within the coverage area of ​​the cover plate 120, and the sidewalls of the cover plate 120 extend beyond the corresponding sidewalls of the display module 110. This ensures that the cover plate 120 completely covers the display module 110, providing comprehensive and complete protection. Furthermore, the cover plate 120 is typically made of a highly transparent material, which, while protecting the display module 110, also prevents the cover plate 120 from affecting its display performance.

[0074] For a screen 100 used in a candybar electronic device, the cover plate 120 on the display module 110 can be a rigid cover plate 120. For example, the cover plate 120 can be a glass cover plate or a PET (Polyethylene terephthalate) cover plate. For a screen 100 used in a foldable electronic device, a flexible protective film can be provided on the display module 110 as a protective layer. For example, the protective film can be a polyimide (PI) film.

[0075] The cover plate 120 (or protective film) can be bonded to the display module 110 using optically clear adhesive (OCA). In other words, an optical adhesive layer (not shown in the figure) can be provided between the cover plate 120 (or protective film) and the display module 110. The optical adhesive has high transparency, a light transmittance of over 99%, strong adhesion, and properties such as high temperature resistance and UV resistance. This ensures a secure connection between the cover plate 120 (or protective film) and the display module 110. Furthermore, the optical adhesive can increase the brightness and contrast of the display module 110, improving the display effect of the screen 100.

[0076] As for the display module 110 mounted on the screen 100, in some embodiments of a candybar electronic device, the display module 110 can also be an LCD (Liquid Crystal Display) display module. An LCD display module places a liquid crystal cell between two parallel substrates (such as glass substrates). A thin film transistor (TFT) is disposed on the lower substrate, and a color filter is disposed on the upper substrate. By changing the signal and voltage on the thin film transistor, the rotation direction of the liquid crystal molecules is controlled, thereby controlling whether polarized light is emitted from each pixel to achieve image display.

[0077] Since an LCD display module is constructed by placing a liquid crystal cell between two parallel substrates, the packaging requirements for LCD display modules are relatively high. An adhesive sealant is usually placed between the two substrates to seal the liquid crystal molecules.

[0078] In other embodiments, the display module 110 can be an OLED (Organic Light-Emitting Diode) display module. An OLED display module is a self-emissive display module 110 that is thin, highly transparent, and possesses excellent color saturation, contrast, and response speed. Because OLED display modules are thinner, lighter, and more transparent, they enable diverse design possibilities. For example, OLED display modules can be used in curved screens and flexible screens. That is, when the electronic device 10 is a foldable electronic device, the screen 100 can be equipped with an OLED display module.

[0079] For example, an OLED display module includes a substrate and an OLED device. The OLED device includes a transparent anode layer (e.g., an indium tin oxide (ITO) thin film), an organic light-emitting layer, and a metal cathode layer, sequentially stacked on the substrate, forming a sandwich structure. The organic light-emitting layer further includes a hole transport layer (HTL), an emissive layer (EL), and an electron transport layer (ETL). The voltage between the transparent anode layer and the metal cathode layer acts on the organic light-emitting layer, causing positive holes and cathode charges to combine in the EL layer, making the EL layer emit light to achieve image display.

[0080] Referring again to Figures 3 and 4, an adhesive backing 610 is provided between the back of the screen 100 and the middle plate portion 211 of the middle frame 210, and the screen 100 is bonded to the middle plate portion 211 of the middle frame 210 by the adhesive backing 610. The adhesive backing 610 can be located close to the edge of the screen 100 and extends circumferentially along the screen 100. By bonding and fixing the edge area of ​​the screen 100 with the adhesive backing 610, it is possible to ensure that the screen 100 is stably and reliably bonded to the middle plate portion 211. Furthermore, in risk scenarios such as drops and collisions, especially edge drops and corner drops, the impact energy can be transferred to the adhesive backing 610 near the frame portion 212 more quickly, and the adhesive backing 610 can more effectively buffer and absorb the impact energy, protecting the screen 100 from damage.

[0081] For example, the adhesive material constituting the backing adhesive 610 is a pressure-sensitive adhesive. For instance, the materials constituting the backing adhesive 610 may include acrylic resin, silicone resin, silicone rubber, polyurethane resin, etc. For the backing adhesive 610 used in the electronic device 10, the backing adhesive 610 may have high-temperature resistance and aging resistance properties to meet the long-term use requirements of the electronic device 10.

[0082] Referring to Figures 3 and 5, since the flexible printed circuit (FPC) connected to the screen 100 is typically folded from the bottom of the screen 100 to the back of the screen 100 to connect with the circuit board inside the electronic device 10, the bottom of the screen 100 is usually not provided with adhesive 610 to avoid the flexible printed circuit board and chips, other circuit cables, and other components that may be located in that area. For example, in the circumferential direction of the screen 100, the adhesive 610 can extend continuously and cover the top edge of the screen 100 and the left and right sides of the screen 100, and the adhesive 610 breaks off at the bottom edge of the screen 100.

[0083] Referring again to Figures 3 to 5, in order to improve the screen-to-body ratio of the screen 100 and enable the electronic device 10 to achieve a full-screen display, more and more electronic devices 10 are using a narrow-slit protective method between the screen 100 and the mid-frame 210. Specifically, at least a portion of the sidewalls of the cover plate 120 extend very little beyond the display module 110 (see Figure 4), and there is no overlap between these sidewalls of the cover plate 120 and the edge portion 212 of the mid-frame 210. In this case, there is a narrow gap of a very small width between these sidewalls of the screen 100 and the edge portion 212 of the mid-frame 210, through which the screen 100 is protected. For ease of explanation, in this embodiment, the narrow gap formed between the sidewalls of the screen 100 and the edge portion 212 is defined as a protective gap.

[0084] It should be noted that the screen-to-body ratio of screen 100 is the ratio of the display area of ​​screen 100 to the total area of ​​screen 100. The display area of ​​screen 100 is the effective display area of ​​display module 110. Display module 110 has a non-display area of ​​a certain width at its edges, which can be used for wiring. The area enclosed by the non-display area is the display area, and the effective display area of ​​display module 110 is determined by the area of ​​its display area.

[0085] The non-display area of ​​the display module 110 and the area of ​​the cover plate 120 extending beyond the display module 110 constitute the black border 101 of the screen 100. Given a fixed effective display area of ​​the display module 110, the wider the black border 101 of the screen 100, the larger the total area of ​​the screen 100, and the lower the screen-to-body ratio. Conversely, the narrower the black border 101 of the screen 100, the smaller the total area of ​​the screen 100, and the higher the screen-to-body ratio.

[0086] In other words, given a fixed area of ​​the display module 110, the screen-to-body ratio of the screen 100 primarily depends on the width of the cover plate 120 extending beyond the display module 110 (the width d between the two vertical dotted lines shown in Figures 4 and 5). The greater the width of the cover plate 120 extending beyond the display module 110, the wider the black border 101 of the screen 100, and the lower the screen-to-body ratio. Conversely, the smaller the width of the cover plate 120 extending beyond the display module 110, the smaller the black border 101 of the screen 100, and the higher the screen-to-body ratio.

[0087] Specifically, all sidewalls of the cover plate 120 may not overlap with the frame portion 212 of the middle frame 210, and the width d of all sidewalls extending beyond the display module 110 may be very small, forming a protective seam between all sidewalls of the cover plate 120 and the frame portion 212. Alternatively, only some sidewalls of the cover plate 120 may not overlap with the frame portion 212 of the middle frame 210, and the width d of these sidewalls extending beyond the display module 110 may be very small, forming a protective seam between these sidewalls and the frame portion 212; while the width d of the remaining sidewalls extending beyond the display module 110 may be larger, and these sidewalls may overlap with the frame portion 212.

[0088] For example, referring to Figures 3 and 5, when only a portion of the sidewalls of the cover plate 120 do not overlap with the frame portion 212 of the middle frame 210, the width d of the top edge (corresponding sidewall) and the left and right sidewalls (corresponding sidewalls) of the cover plate 120 extending beyond the display module 110 can be very small, forming a protective seam between the top edge and the left and right sidewalls of the cover plate 120 and the frame portion 212. However, the width d of the bottom edge (corresponding sidewall) of the cover plate 120 extending beyond the display module 110 can be larger, and the bottom edge of the cover plate 120 overlaps with the frame portion 212.

[0089] Of course, without considering the screen ratio of the screen 100, the width d of all the side walls of the cover plate 120 extending out of the display module 110 can be relatively large, and all the side walls overlap with the border portion 212 of the middle frame 210.

[0090] To achieve the overlap between the cover plate 120 and the frame portion 212 of the middle frame 210, a step portion 2121 may extend from the inner sidewall of the frame portion 212 (the sidewall of the frame portion 212 facing the screen 100). The step portion 2121 may protrude from the surface of the middle frame portion 211 facing the screen 100. The step portion 2121 is located on the outside of the display module 110, and there may be a certain clearance between the step portion 2121 and the display module 110. The portion of the cover plate 120 extending outside the display module 110 overlaps with the step portion 2121 (in the plane direction of the screen 100), and the cover plate 120 may overlap on the top surface of the step portion 2121.

[0091] At this time, a step adhesive 630 can be provided between the cover plate 120 and the step portion 2121 of the middle frame 210. The cover plate 120 is bonded to the step portion 2121 by the step adhesive 630, achieving a sealed connection between the cover plate 120 and the step portion 2121. In this way, the step adhesive 630 not only serves to fix the cover plate 120 and the step portion 2121, but also seals the gap between the screen 100 and the frame portion 212. By using the step adhesive 630 to protect the corresponding parts of the screen 100, it prevents external dust, moisture, and other foreign objects from entering the display module 110 through the corresponding parts, thereby improving the overall reliability of the electronic device 10.

[0092] Referring again to Figures 3 and 4, when the sidewall of the screen 100 and the frame 212 of the middle frame 210 are fitted with a protective seam, a side sealant 620 can also be provided on the sidewall of the screen 100. The side sealant 620 seals the sidewall of the screen 100, preventing external moisture, dust, etc., from entering the display module 110, ensuring the working performance of the display module 110, and preventing problems such as liquid ingress and electrostatic discharge from occurring in the display module 110. Furthermore,

[0093] The side sealant 620 typically uses a low-modulus adhesive material, such as silicone. This gives the side sealant 620 good elasticity, providing excellent cushioning. In high-risk scenarios such as drops and impacts to the electronic device 10, especially edge drops and corner drops, the edge portion 212 of the mid-frame 210 transfers the impact energy to the side sealant 620. The side sealant 620 absorbs the impact energy through its own elastic deformation, preventing issues such as bright spots, localized damage, or cracks at the edges of the screen 100, thus protecting the integrity of the screen 100 and improving its reliability.

[0094] Since the display module 110 is a key component for realizing the display function of the screen 100, and the cover plate 120 is only used to protect the display module 110, the side sealant 620 can only cover the side wall of the display module 110. The side sealant 620 is used to protect the display module 110 and absorb the impact force received by the side wall of the display module 110. At this time, the side sealant 620 can be connected to the side wall of the display module 110 and the surface of the cover plate 120 (the part extending outside the display module 110) facing the display module 110. The cover plate 120 can be used to position the side sealant 620, which facilitates the dispensing operation of the side sealant 620. In addition, the cover plate 120 also forms a shielding protection for the side sealant 620, which can protect the side sealant 620 from damage when the electronic device 10 is dropped, bumped, or pierced by a sharp object.

[0095] The side sealant 620 covers at least the top of the screen 100 and at least the location of the sound outlet. In the planar direction of the screen 100, the display module 110 typically has a clearance notch at the location of the sound outlet. This clearance notch is used to enclose the sound outlet and may also be used to avoid devices such as cameras, earpieces, and sensors disposed within the housing of the electronic device 10. For example, the side sealant 620 can fill the clearance notch, and openings are formed on the side sealant 620 to avoid these devices.

[0096] By adhering the side sealant 620 to the side wall of the display module 110 corresponding to the sound outlet, this part of the display module 110 can be protected to prevent external moisture, dust, and other foreign objects from entering the display module 110 through the sound outlet. Meanwhile, the area of ​​the screen 100 where the sound outlet is located is usually a vulnerable part of the screen 100; when the electronic device 10 is dropped or impacted, this area of ​​the screen 100 is easily damaged. The side sealant 620 can absorb impact energy, protecting this area of ​​the screen 100 from damage, maintaining the integrity of the screen 100, and improving the reliability of the screen 100.

[0097] Furthermore, the side sealant 620 should avoid the bottom of the screen 100, or in other words, the side sealant 620 should not be applied to the bottom edge of the screen 100. This prevents the side sealant 620 from affecting the folding and extension of the flexible circuit board from the bottom edge of the screen 100, which will not be elaborated further here.

[0098] Referring again to Figures 3 and 4, side sealant 620 can be applied only to the sidewalls of screen 100 to protect the sidewalls of display module 110 when a protective seam is formed between the sidewalls of screen 100 and the frame portion 212 of mid-frame 210. In this case, while avoiding the bottom edge of screen 100, side sealant 620 can cover as much of the other sidewalls of screen 100 as possible. For example, side sealant 620 can extend continuously and cover the top edge and the left and right sides of display module 110, effectively completely covering the top edge and the left and right sides of screen 100. This provides better protection for display module 110.

[0099] At this time, when the bezel portion 212 forms a stepped portion 2121 at the bottom edge of the screen 100 and a stepped adhesive 630 is provided at the bottom edge of the screen 100, the stepped adhesive 630 can overlap with the side sealing adhesive 620 covering the left and right sides of the display module 110, so as to form complete protection for the periphery of the screen 100 through the side sealing adhesive 620 and the stepped adhesive 630. When the stepped adhesive 630 cannot contact the side sealing adhesive 620, a dammed adhesive 640 can be provided at both ends of the bottom edge of the screen 100 (see Figure 3), so as to connect the stepped adhesive 630 and the side sealing adhesive 620 through the dammed adhesive 640, and the side sealing adhesive 620, the stepped adhesive 630, and the dammed adhesive 640 form complete protection for the periphery of the screen 100. In this way, the screen 100 can be provided with more thorough sealing protection and more comprehensive impact resistance protection, thereby improving the reliability and service life of the screen 100.

[0100] When the bezel portion 212 does not have a stepped portion 2121, and a protective seam is formed between the bottom edge of the screen 100 and the bezel portion 212, sealant 650 can be filled into the protective seam between the bottom edge of the screen 100 and the bezel portion 212. The sealant 650 protects the bottom of the screen 100. Furthermore, the sealant 650 can connect with the side sealant 620 covering the left and right sides of the display module 110, so that the side sealant 620 and the sealant 650 form complete protection around the screen 100; this will not be elaborated further here. (The sealant 650 will be described in detail later in this embodiment.)

[0101] However, due to the protective seam between the screen 100 and the bezel 212 of the mid-frame 210, when the electronic device 10 is subjected to risks such as drops or collisions, the bezel 212 can easily release the impact force to the screen 100. The side sealant 620 has limited protective effect on the display module 110, resulting in a higher risk of the screen 100 developing bright spots, localized damage, and cracks, thus lowering its reliability. Furthermore, in risky scenarios, to prevent the bezel 212 from impacting the screen 100, a relatively wide protective seam is often required between the screen 100 and the bezel 212, which affects the overall aesthetics of the electronic device 10. Additionally, during long-term use, dust can easily accumulate in the protective seam, and there is also a risk of moisture entering the display module 110, potentially causing protection problems. For example, the screen 100 may experience liquid ingress or electrostatic discharge.

[0102] Figure 6 is a plan view of another screen assembly structure provided in an embodiment of this application. Figure 7 is a partial cross-sectional view of the screen assembly structure in Figure 6 at point CC. As shown in Figures 6 and 7, when a protective gap is formed between the side wall of the screen 100 and the frame portion 212 of the middle frame 210, sealant 650 can be filled into the protective gap to protect the side wall of the screen 100.

[0103] The sealant 650 typically uses a low-modulus adhesive, such as a hot melt adhesive, with an elastic modulus between 5MPa and 40MPa. The sealant 650 possesses sufficient adhesive strength and stability to effectively seal the protective seam between the screen 100 and the frame 212 for a long period. Furthermore, the sealant 650 has low hardness and good elasticity, allowing it to undergo elastic deformation under impact, providing good cushioning and preventing hard contact between the screen 100 and the frame 212.

[0104] The sealant 650 can be used to seal and protect the entire electronic device 10, preventing external dust, moisture, grease, and other foreign objects from entering the display module 110 through the protective seam. This ensures the working performance of the display module 110 and prevents problems such as liquid ingress and electrostatic discharge. Furthermore, in high-risk scenarios such as drops and collisions, especially edge drops and corner drops, the edge portion 212 of the mid-frame 210 transmits the impact force to the sealant 650. The sealant 650, through its own cushioning effect, deforms and absorbs the impact force, protecting the screen 100. This prevents problems such as bright spots, localized damage, or cracks on the screen 100, improving its reliability and lifespan.

[0105] Since the sealant 650 is filled in the protective gap between the screen 100 and the frame 212, it completely seals the gap. Therefore, the sealant 650 needs to avoid the location of the sound outlet gap, and it can be applied in sections on both sides of the gap. This prevents the sealant 650 from blocking the sound outlet gap and ensures that it functions properly.

[0106] Furthermore, typically before assembling the screen 100 to the mid-frame 210, the sealant 650 is applied to the edge portion 212 of the mid-frame 210. Then, the screen 100 is attached to the mid-plate portion 211 of the mid-frame 210 using adhesive 610. Simultaneously, the sidewalls of the screen 100 press against the sealant 650 on the edge portion 212, filling the protective gap between the screen 100 and the edge portion 212. Therefore, the flexible circuit board folded out from the bottom of the screen 100 has no effect on the sealant 650, allowing it to fill the gap between the bottom of the screen 100 and the edge portion 212.

[0107] For example, when the sidewalls of the screen 100 and the frame portion 212 are fitted with protective seams, the sealant 650 can be filled in the protective seams around the screen 100, and the sealant 650 is discontinuous on both sides of the sound outlet seam (see Figure 6). When the frame portion 212 forms a stepped portion 2121 at the bottom edge of the screen 100 and a stepped sealant 630 is provided at the bottom edge of the screen 100, the sealant 650 can be filled only in the protective seams between the top edge and the left and right side edges of the screen 100 and the frame portion 212, and the sealant 650 is discontinuous on both sides of the sound outlet seam. Alternatively, the sealant 650 can also be filled in the protective seam between the bottom edge of the screen 100 and the frame portion 212. In this case, the sealant 650 can fill the space above the stepped sealant 630.

[0108] Furthermore, a side sealant 620 can be provided on the side wall of the screen 100, covering the side wall of the display module 110. In some embodiments, the side sealant 620 may adhere only to the position corresponding to the sound outlet on the display module 110 to protect the display module 110 at the sound outlet. In this case, since the sealant 650 is broken on both sides of the sound outlet, and the side sealant 620 only covers the position corresponding to the sound outlet on the display module 110, and there is a positional difference between the side sealant 620 and the sealant 650 in the planar direction of the screen 100, the sealant 650 may not be able to contact the side sealant 620.

[0109] To address this, a damming adhesive 640 can be installed on both sides of the sound outlet (see Figure 6). In the planar direction of the screen 100, the damming adhesive 640 extends to both the location of the sealant 650 and the location of the side sealant 620. In this way, the damming adhesive 640 connects the sealant 650 and the side sealant 620, forming a complete protective barrier around the screen 100. This provides a more thorough seal and more comprehensive impact protection for the screen 100, thereby improving its reliability and lifespan.

[0110] In other embodiments, while avoiding the bottom edge of the screen 100, the side sealant 620 can cover as many other sidewalls of the screen 100 as possible. For example, the side sealant 620 can extend continuously and cover the top edge and the left and right side edges of the display module 110. In this case, the protective seam in the area where the top edge and the left and right side edges of the screen 100 are located is filled with sealant 650, and the sidewalls of the display module 110 are covered with side sealant 620. In this way, sealant 650 plays a role in sealing and protecting the entire electronic device 10 and in shock absorption, which can reduce the probability of damage to the screen 100. The side sealant 620, which directly covers the sidewalls of the display module 110, can better protect the display module 110 from damage. With the dual buffering effect of sealant 650 and side sealant 620, damage to the screen 100 can be better avoided, and the screen 100 has higher reliability and a longer service life.

[0111] For example, when the electronic device 10 is subjected to a strong impact, such as when the electronic device 10 falls onto a hard surface (or wall) with a certain initial velocity, the frame portion 212 of the mid-frame 210 is subjected to a strong impact force. The frame portion 212 transmits this impact force to the sealant 650, which undergoes elastic deformation to absorb part of the impact force. Then, the remaining force is transmitted to the side sealant 620, which absorbs the remaining force through its own elastic deformation, thereby eliminating the impact on the screen 100.

[0112] However, because the sealant 650 uses a low-modulus adhesive, it has low hardness and high elasticity, primarily serving a vibration damping function. However, the sealant 650 has low shear strength and does not provide adequate restraint for the screen 100. When the electronic device 10 is dropped or impacted, the screen 100 is prone to shaking, increasing the risk of collision between the screen 100 and the edge portion 212 of the mid-frame 210. Especially in edge or corner drop scenarios, the screen 100 may lurch in the direction of the drop, as shown by the arrows in Figure 7, exhibiting a tendency to lurch straight towards the edge portion 212 and a tendency to lurch diagonally away from the mid-frame portion 211. Therefore, the screen 100 still faces reliability risks and may still experience issues such as bright spots, localized damage, and cracks.

[0113] Figure 8 is a schematic diagram of the third screen assembly structure provided in the embodiment of this application. Figure 9 is an exploded view of the screen assembly structure in Figure 8. Figure 10 is an exploded view of the screen assembly structure in Figure 8 after removing screen 100. Figure 11 is a partial cross-sectional view of the screen assembly structure in Figure 8 at point DD in Figure 9. Figure 12 is another possible cross-sectional view of the screen assembly structure provided in the embodiment of this application.

[0114] Referring to Figures 8 and 9, the figures mainly illustrate the screen 100, the middle frame 210, and the adhesive structure between them. To facilitate observation of the adhesive structure between the screen 100 and the middle frame 210, the complete structure of the screen 100 is not shown in the figures; only the cover plate 120 of the screen 100 is shown, and the display module 110 is not shown.

[0115] Referring to Figure 9, an adhesive backing 610 is provided between the screen 100 and the middle plate portion 211 of the middle frame 210. The adhesive backing 610 is close to the edge of the screen 100 and avoids the bottom of the screen 100. The screen 100 is bonded to the middle plate portion 211 of the middle frame 210 by the adhesive backing 610. As shown in Figures 9 and 10, the screen 100 and the frame portion 212 are fitted together with a protective seam, and the protective seam between the side wall of the screen 100 and the frame portion 212 is filled with sealant 650. The sealant 650 surrounds the screen 100 and is disconnected on both sides of the sound outlet provided at the top of the screen 100. As shown in Figures 10 and 11, a side sealant 620 is provided at the location of the sound outlet at the top of the screen 100, and the side sealant 620 covers the side wall of the display module 110. Furthermore, a damming adhesive 640 is provided on both sides of the sound outlet at the top of the screen 100. The damming adhesive 640 connects the sealant 650 and the side sealant 620. The sealant 650, the side sealant 620 and the damming adhesive 640 form a complete protection around the screen 100.

[0116] Referring to Figures 10 and 12, in addition to the above, a special adhesive 660 is also provided between the screen 100 and the middle plate portion 211 of the middle frame 210, and the special adhesive 660 is also provided near the edge of the screen 100. The special adhesive 660 and the backing adhesive 610 work together to achieve the adhesive connection between the screen 100 and the middle plate portion 211 of the middle frame 210.

[0117] Of course, when adhesive 610 and special adhesive 660 are provided between the screen 100 and the middle plate portion 211 of the middle frame 210, this embodiment does not limit the way the sidewalls of the screen 100 and the frame portion 212 of the middle frame 210 are fitted together. In addition to the method shown in FIG9 (or FIG12), the protective gap between the sidewalls of the screen 100 and the frame portion 212 may not be filled with sealant 650, but the top edge and the left and right sides of the display module 110 may be protected by side sealant 620 (as shown in FIG3-4). The frame portion 212 may be provided with a step portion 2121 at the bottom edge of the screen 100, and the bottom edge of the screen 100 may be protected by step adhesive 630 (as shown in FIG5). Alternatively, the four sides of the screen 100 may overlap the step portion 2121 of the frame portion 212, and the entire screen 100 may be protected by step adhesive 630.

[0118] The following description will be based on the example shown in Figure 9 (or Figure 12) of the fit between the side wall and the frame portion 212 of the screen 100.

[0119] The special adhesive 660 applied between the screen 100 and the middle plate portion 211 of the mid-frame 210 can be a polyurethane-based adhesive. The special adhesive 660 can be applied to the back of the screen 100, near its edge, using a dispensing process. The special adhesive 660 can be a specific modulus adhesive, possessing characteristics such as high shear strength and high energy dissipation. The special adhesive 660, together with the backing adhesive 610, bonds the screen 100 to the middle plate portion 211 of the mid-frame 210, increasing the bonding strength between the screen 100 and the middle plate portion 211, thus improving the stability and reliability of the screen 100. Furthermore, in high-risk scenarios such as drops and collisions, the special adhesive 660 can suppress the vibration of the screen 100 and dissipate the impact energy received by the mid-frame 210 through attrition, significantly reducing the probability of the screen 100 experiencing bright spots, localized damage, or cracks, effectively protecting the screen 100 from damage and further improving its reliability and lifespan.

[0120] Specifically, the adhesive 660 can be made of a material with a high elastic modulus, giving it strong shear bond strength. This allows the adhesive 660 to suppress vibrations of the screen 100 during drops or impacts, especially edge or corner drops. In other words, the adhesive 660 has strong tensile strength, preventing the screen 100 from shifting. It also prevents the screen 100 from contacting or colliding with the edge portion 212 of the mid-frame 210, significantly reducing the probability of the edge portion 212 transmitting impact to the screen 100. Simultaneously, the high energy dissipation characteristic of the adhesive 660 allows it to better absorb the impact energy transmitted from the mid-frame 210 when it is impacted. The adhesive 660 dissipates the energy through energy loss, preventing it from being transmitted to the screen 100. Therefore, by suppressing vibrations and absorbing impact energy, the adhesive 660 effectively protects the screen 100 from damage, significantly improving its reliability and lifespan.

[0121] The adhesive 610 and the special adhesive 660, disposed between the screen 100 and the middle plate 211 of the middle frame 210, each serve their own functions of bonding and sealing. Simultaneously, in terms of impact resistance, the adhesive 610 and the special adhesive 660 work together to further enhance the impact resistance of the screen 100. Specifically, when the electronic device 10 is impacted in risk scenarios such as drops or collisions, the low-modulus, soft adhesive 610 (usually made of foam, silicone, or similar materials) can undergo elastic deformation, absorbing impact energy through a cushioning effect. The high-modulus, high-energy-dissipating special adhesive 660 can suppress screen 100 vibration, prevent screen 100 from shifting, and dissipate impact energy through attrition.

[0122] Alternatively, when the adhesive 610 and the special adhesive 660 work together to resist the impact force on the electronic device 10, the adhesive 610 can act as a "main spring system" to achieve rapid buffering and unloading of the impact load. For example, when the electronic device 10 is not impacted, the polymers in the adhesive 610 are in a relaxed state (a loose state with relatively straightened molecular chains); when the electronic device 10 is impacted, the polymers in the adhesive 610 are compressed and curled up (the molecular chains are relatively compressed and entangled together), thereby absorbing the impact energy. The special adhesive 660 can act as a "main damping system" to suppress the vibration of the screen 100 and dissipate the impact energy through loss.

[0123] Therefore, the impact resistance of screen 100 can be comprehensively improved. Especially in scenarios where electronic device 10 is dropped from a corner or edge, it can achieve the dual effects of shock absorption and energy release, effectively protecting screen 100 from damage and preventing issues such as bright spots, localized breakage, and cracks. Furthermore, when screen 100 is dropped face-first, the shock absorption of the backing adhesive 610 and the energy release of the special adhesive 660 can also enhance the competitiveness of electronic device 10 in terms of front-side drop resistance of screen 100.

[0124] The loss factor of the special adhesive 660 can be greater than 0.3. The loss factor is the tangent of the phase difference angle between the strain and stress periods of a viscoelastic material under an alternating force field, and is also equal to the ratio of the material's loss modulus to its elastic modulus. The loss factor is a key parameter characterizing the vibration damping and energy absorption properties of polymer materials. By ensuring that the loss factor of the special adhesive 660 is greater than 0.3, when the electronic device 10 is subjected to an impact, the special adhesive 660 can effectively and promptly dissipate the impact energy, protecting the integrity of the screen 100.

[0125] For example, the loss factor of the special adhesive 660 can be 0.32, 0.34, 0.36, 0.38, 0.40, 0.42, 0.44, 0.46, etc.

[0126] The loss modulus of the special adhesive 660 can be greater than 30 MPa. This gives the special adhesive 660 a high loss modulus, meeting the requirements for its high energy consumption characteristics. For example, the loss modulus of the special adhesive 660 can be 32 MPa, 34 MPa, 36 MPa, 38 MPa, 40 MPa, 42 MPa, 44 MPa, 46 MPa, 48 MPa, 50 MPa, 52 MPa, 54 MPa, 56 MPa, 58 MPa, etc.

[0127] The elastic modulus of the special adhesive 660 can be between 80 MPa and 120 MPa. This gives the special adhesive 660 a relatively large elastic modulus and a relatively hard material, ensuring sufficient shear strength. When the electronic device 10 is subjected to impact, the special adhesive 660 can effectively suppress the vibration of the screen 100 and prevent the screen 100 from shifting. Furthermore, the elastic modulus of the special adhesive 660 is not excessively large, ensuring sufficient adhesion so that the screen 100 can reliably bond to the middle plate portion 211 of the middle frame 210. It also maintains the ratio of the loss modulus to the elastic modulus of the special adhesive 660 within a suitable range to meet the requirements of the loss factor.

[0128] For example, the elastic modulus of the special adhesive 660 can be 85MPa, 90MPa, 95MPa, 100MPa, 105MPa, 110MPa, 115MPa, etc.

[0129] The shear bond strength of the special adhesive 660 can be greater than 5 MPa. This high bonding strength ensures a reliable bond between the screen 100 and the mid-frame 210. Furthermore, the high shear strength of the special adhesive 660 significantly suppresses vibrations of the screen 100 when the electronic device 10 is subjected to impacts such as drops or collisions, effectively preventing the screen 100 from shifting and protecting it from contact or collision with the mid-frame 210.

[0130] For example, the shear bond strength of the special adhesive 660 can be 5.2MPa, 5.4MPa, 5.6MPa, 5.8MPa, 6.0MPa, 6.2MPa, 6.4MPa, 6.6MPa, 6.8MPa, 7.0MPa, 7.2MPa, 7.4MPa, 7.6MPa, etc.

[0131] Although both the adhesive 660 and the backing adhesive 610 are located near the edge of the screen 100, their properties differ. Therefore, the adhesive 660 and the backing adhesive 610 should be spaced apart, without overlap or splicing. This avoids interference between them, ensuring both can function effectively. Furthermore, it facilitates the smooth application of the adhesive 660, ensuring the flatness of the back of the screen 100 in the area where the adhesive 660 is applied, thus guaranteeing the flatness and reliability of the screen 100 after it is mounted on the mid-frame 210.

[0132] Specifically, the spacing between the special adhesive 660 and the backing adhesive 610 can be 2mm-5mm. On the one hand, the certain spacing between the special adhesive 660 and the backing adhesive 610 can prevent them from sticking together, ensuring that both the special adhesive 660 and the backing adhesive 610 can function stably and reliably. On the other hand, when the electronic device 10 is subjected to impact, the close proximity of the backing adhesive 610 (as the "main spring system") and the special adhesive 660 (as the "main damping system") allows them to work together effectively to resist impact.

[0133] For example, the spacing between the special adhesive 660 and the backing adhesive 610 can be 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm, etc.

[0134] Figure 13 is a front view of the screen assembly structure in Figure 8 after the screen has been removed. Referring to Figures 12 and 13, regarding the relative position of the adhesive 660 and the backing adhesive 610, the backing adhesive 610 can be positioned around the outer periphery of the adhesive 660. In this way, the screen 100 is pre-fixed to the middle plate portion 211 of the middle frame 210 mainly by the backing adhesive 610, ensuring the bonding stability of the screen 100. Furthermore, the backing adhesive 610 is usually wider, and placing it closest to the edge of the screen 100 also provides good protection, effectively preventing external moisture, dust, and other foreign objects from entering the electronic device 10. Based on the pre-fixation of the screen 100 by the backing adhesive 610, the adhesive 660 located inside the backing adhesive 610 can further enhance the bonding strength between the screen 100 and the middle frame 210. The additional adhesive 660 suppresses vibration and dissipates impact energy in terms of impact resistance, improving the impact resistance of the screen 100 and protecting it from damage.

[0135] Of course, the special adhesive 660 can also be surrounded on the outer periphery of the backing adhesive 610, and this embodiment does not limit this.

[0136] For example, for small electronic devices 10, such as candybar phones, the width of the adhesive 660 can be around 1 mm. For instance, the width of the adhesive 660 can be 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, etc. For larger electronic devices 10, such as foldable phones, tablets, etc., the width of the adhesive 660 can be increased accordingly.

[0137] The dispensing height (thickness) of the adhesive 660 can be matched with the thickness of the backing adhesive 610. For example, the thickness of the adhesive 660 can be between 0.25mm and 0.3mm. This ensures that the adhesive 660 has sufficient dispensing volume to achieve reliable bonding between the screen 100 and the mid-frame 210. Simultaneously, it avoids excessive dispensing height of the adhesive 660, preventing an excessive gap between the screen 100 and the middle plate portion 211 of the mid-frame 210, which could affect the flatness and reliability of the screen 100. For example, the thickness of the adhesive 660 can be 0.26mm, 0.27mm, 0.28mm, 0.29mm, etc.

[0138] Referring again to Figure 13, with the adhesive 660 positioned near the edge of the screen 100, the adhesive 660 can extend along the contour of the screen 100 (or the mid-frame 210). Alternatively, the adhesive 660 can extend along the direction of the edge of the screen 100 (or the mid-frame 210). This improves the overall adhesion of the adhesive 660 to the screen 100, enhancing its integrity and reliability. Furthermore, when the electronic device 10 is impacted, regardless of where the impact force is concentrated, the adhesive 660 located at different points on the screen 100 can promptly suppress vibrations and quickly dissipate impact energy, effectively and fully protecting the integrity of the screen 100. Additionally, the adhesive 660 at different locations can disperse and offset the impact force on the electronic device 10, allowing the impact energy to be released more rapidly.

[0139] As for the application area of ​​the adhesive 660, similar to the backing adhesive 610, the adhesive 660 should avoid at least a portion of the bottom edge of the screen 100 to avoid the flexible circuit board and chips, other circuit cables, and other components that may be located on the bottom of the screen 100. In other words, the adhesive 660 can cover at least a portion of the top edge of the screen 100, and can also cover at least a portion of the left and right sides of the screen 100.

[0140] Specifically, referring to Figure 13, the adhesive 660 may include a top segment 661 and a side segment 662. The top segment 661 is disposed near the top edge of the screen 100, and extends, for example, along the extension direction of the top edge of the screen 100, covering at least a portion of the top edge of the screen 100. The side segment 662 is disposed near the left and right sides of the screen 100, and extends, for example, along the extension direction of the left and right sides of the screen 100, covering at least a portion of the sides of the screen 100.

[0141] Specifically, the top segment 661 of the adhesive 660 covers at least both top ends of the screen 100. In other words, the top segment 661 of the adhesive 660 covers at least the two top corners of the screen 100. Thus, in the scenario where the electronic device 10 is most susceptible to corner drop risk, the adhesive 660 provides excellent protection for the two top corners of the screen 100, preventing damage to the two top corners. For example, when the top segment 661 of the adhesive 660 only covers the two top corners of the screen 100, the extended shape of the two top segments 661 at both ends of the top of the screen 100 can match the corner contour of the screen 100 (or the mid-frame 210), for example, the two top segments 661 of the adhesive 660 can be curved segments.

[0142] When the side segment 662 of the adhesive 660 only covers a portion of the side of the screen 100, there can be a certain gap between the side segment 662 and the top segment 661. The side segment 662 can cover most of the middle area of ​​the side of the screen 100, ensuring that the side segment 662 of the adhesive 660 can provide comprehensive protection in the event of a drop risk to the electronic device 100, preventing damage to the side of the screen 100. For example, as shown in Figure 13, the side segment 662 of the adhesive 660 is a continuous, integral structure that continuously covers most of the middle area of ​​the side of the screen 100. Alternatively, the side segment 662 of the adhesive 660 can also be a discontinuous, multi-segment structure; this embodiment does not limit this.

[0143] Figure 14 is a front view of the fourth screen assembly structure provided in this application embodiment after the screen has been removed. Referring to Figure 14, based on the fact that the top segment 661 of the adhesive 660 only covers the top two ends of the screen 100, the upper end of the side segment 662 of the adhesive 660 can extend to connect with the top of the screen 100, and the lower end of the side segment 662 can extend to near the bottom edge of the screen 100. That is to say, the side segment 662 of the adhesive 660 is a continuous, integral structure, and the side segment 662 is connected to the top segment 661 and covers almost all areas of the side of the screen 100. At this time, when the adhesive 660 needs to avoid the bottom edge of the screen 100, it is equivalent to the side segment 662 of the adhesive 660 completely covering the side of the screen 100. In this way, the adhesive 660 provides complete protection for the two top corners and the left and right sides of the screen 100, which can prevent damage to the two top corners and the sides of the screen 100, and more effectively protect the integrity of the screen 100.

[0144] Figure 15 is a front view of the fifth screen assembly structure provided in this application embodiment after the screen has been removed. Referring to Figure 15, based on the side segment 662 of the adhesive 660 completely covering the side edges of the screen 100, the top segment 661 of the adhesive 660 can also completely cover the top of the screen 100. In other words, the top segment 661 of the adhesive 660 can extend from the center of the top of the screen 100 to both ends of the top of the screen 100 and connect with the side segment 662 of the adhesive 660. In this way, the adhesive 660 completely protects the top and left and right sides of the screen 100. In the event of a corner drop or edge drop, the adhesive 660 can effectively protect the screen 100 from damage, providing more comprehensive and complete impact protection for the screen 100.

[0145] Furthermore, when the adhesive 660 is located inside the adhesive 610, the adhesive 660 may also include a bottom section 663. The bottom section 663 of the adhesive 660 is positioned close to the bottom edge of the screen 100, and the bottom section 663 can extend from the side of the screen 100 towards the center of the screen 100 by a predetermined distance. In this way, the bottom section 663 of the adhesive 660 will not completely cover the bottom edge of the screen 100, thus avoiding the middle area of ​​the bottom edge of the screen 100 and preventing damage to flexible circuit boards, chips, and other components at the bottom of the screen 100. Moreover, in scenarios where the electronic device 10 is subjected to a bottom corner drop, the bottom section 663 of the adhesive 660 can also provide better protection for the bottom corner of the screen 100, further improving the impact resistance of the screen 100 and providing more comprehensive protection for the integrity of the screen 100.

[0146] When the side segment 662 of the adhesive 660 extends close to the bottom edge of the screen 100, the bottom segment 663 of the adhesive 660 can connect with the side segment 662. In this way, the side segment 662 and the bottom segment 663 of the adhesive 660 form a full coverage of the bottom corner of the screen 100, which can further improve the protection effect on the bottom corner of the screen 100.

[0147] Regarding the color of the adhesive 660, in one implementation, the adhesive 660 can be black. When the electronic device 10 is not displaying (screen off), the screen 100 is typically black, and the sealant 650 filling the protective gap between the sidewalls of the screen 100 and the frame 212 of the mid-frame 210 is also generally black to ensure color consistency in the electronic device 10. Therefore, by setting the adhesive 660 to black, its color matches that of the sealant 650. After disassembling the electronic device 10, the screen assembly structure has a more uniform color and a simpler appearance.

[0148] For example, the brightness of Special Adhesive 660 can reach 25 cd / m². 2 -26.5cd / m 2 Therefore, the color of Specialty Adhesive 660 is relatively dark, and it is close to pure black. For example, the brightness of Specialty Adhesive 660 can be 25.2 cd / m². 2 25.4 cd / m 2 25.6 cd / m 2 25.8 cd / m 2 26.0 cd / m 2 26.2 cd / m 2 26.4 cd / m 2 wait.

[0149] The red-green value of Special Adhesive 660 can be between -0.3 and 0.5, indicating that the color of Special Adhesive 660 is basically not biased towards red or green. The yellow-blue value of Special Adhesive 660 can be between -1.0 and 0, indicating that the color of Special Adhesive 660 is also basically not biased towards yellow or blue. The color difference ΔE of Special Adhesive 660 is ≤2. Thus, the color difference of Special Adhesive 660 is very small, the color is purer, and it is closer to pure black.

[0150] This application also provides a screen assembly method for assembling a screen 100 onto a mid-frame 210 to form the aforementioned third, fourth, or fifth screen assembly structure. The screen assembly method provided in the embodiments will be described in detail below.

[0151] Figure 16 is a flowchart of the screen assembly method provided in an embodiment of this application. Referring to Figure 16, the specific steps of the screen assembly method are as follows:

[0152] The S100 comes with a screen, and the back of the screen has adhesive backing.

[0153] First, we provide a pre-assembled screen 100, with adhesive 610 already applied to the back of the screen 100 near the edge.

[0154] S200: Apply a special adhesive to the back of the screen, with the special adhesive and the backing adhesive spaced apart.

[0155] Next, using a dispensing process, the adhesive 660 is applied to the back of the screen 100. The adhesive 660 is also located near the edge of the screen 100, and is spaced apart from the backing adhesive 610. For example, the adhesive 660 can be applied to the inside of the backing adhesive 610.

[0156] After applying the adhesive 660, the screen 100 typically needs to be mounted onto the middle plate 211 of the mid-frame 210 within 3 minutes. Therefore, before applying the adhesive 660 to the back of the screen 100, the release film on the adhesive 610 needs to be removed. This allows the screen 100 to be mounted onto the mid-frame 210 in a shorter time after applying the adhesive 660.

[0157] S300: The screen is mounted on the middle plate of the mid-frame.

[0158] After applying the special adhesive 660 to the back of the screen 100, the next step is to mount the screen 100 onto the middle plate 211 of the middle frame 210.

[0159] Typically, before attaching the screen 100 to the middle plate portion 211 of the middle frame 210, a sealant 650 is applied to the edge portion 212 of the middle frame 210 using an adhesive dispensing process. Then, the screen 100 is attached to the middle plate portion 211 of the middle frame 210 and held under pressure for a period of time (the screen 100 and the middle frame 210 can be placed in an integrated pressure-holding fixture). During this process, the sealant 650 flows along the edge portion 212 into the protective seam formed between the screen 100 and the edge portion 212. The sidewalls of the screen 100 press against the sealant 650, causing it to fill the protective seam.

[0160] Then, the sealant 650 filling the protective seam is inspected. If the amount of sealant 650 is insufficient, that is, if the sealant 650 does not reach the front end face of the frame portion 212 (the end face of the frame portion 212 that is away from the middle plate portion 211 and extends towards the front of the screen 100), some more sealant 650 can be added to the protective seam.

[0161] Next, the mid-frame 210 and screen 100 are placed together on the curing device. For example, the mid-frame 210 and screen 100 can be fixed to the curing device using vacuum adsorption. Before this, vibration can be used, for example, by placing the mid-frame 210 and screen 100 together on a vibration table, to make the sealant 650 fill the protective seam more evenly and densely. Then, the sealant 650 that has overflowed onto the front end of the frame portion 212 is wiped off, and the sealant 650 and the special adhesive 660 are cured.

[0162] After the sealant 650 and the special adhesive 660 have cured, there is usually a step to activate the backing adhesive 610. By applying sufficient pressure, the backing adhesive 610 is tightly and reliably bonded between the screen 100 and the mid-frame 210. At this point, the assembly of the screen 100 and the mid-frame 210 is completed, forming the aforementioned screen assembly structure.

[0163] Finally, while maintaining the same bonding scheme between the sidewall of the screen 100 and the frame portion 212 of the middle frame 210, this embodiment also employs several different bonding schemes between the back of the screen 100 and the middle plate portion 211 of the middle frame 210, resulting in several different screen assembly structures. Impact resistance tests were conducted on these screen assembly structures. Specifically, drop tests were performed on these screen assembly structures from a drop height of 1.8m.

[0164] When only adhesive 610 is provided between the screen 100 and the middle plate portion 211 of the middle frame 210, 100% of the screens 100 break. When both adhesive 610 and sealant 650 are provided between the screen 100 and the middle plate portion 211 of the middle frame 210, with the sealant 650 located inside the adhesive 610, 1 / 5 of the screens 100 break after two drops. When both adhesive 610 and special adhesive 660 are provided between the screen 100 and the middle plate portion 211 of the middle frame 210, with the special adhesive 660 located inside the adhesive 610 (as in the third screen assembly structure described in the embodiment), no screens 100 break after 20 drops. It can be seen that by adding special adhesive 660 between the screen 100 and the middle plate 211 of the middle frame 210, the impact resistance of the screen 100 can be significantly improved, protecting the screen 100 from damage in risky scenarios.

[0165] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0166] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

Claims

1. A screen assembly structure characterized by comprising: The application relates to a screen assembly structure, which comprises the following parts: a middle frame, which comprises a middle plate part and a frame part, and the frame part is arranged around the periphery of the middle plate part; a screen, which is supported on the middle plate part; a back adhesive, which is arranged between the back of the screen and the middle plate part and is close to the edge of the screen; a characteristic adhesive, which is arranged between the back of the screen and the middle plate part, is close to the edge of the screen and is spaced apart from the back adhesive; wherein the loss factor of the characteristic adhesive is greater than 0.3, and the loss modulus is greater than 30 MPa.

2. The screen assembly structure according to claim 1, wherein The elastic modulus of the characteristic adhesive is 80-120 MPa.

3. The screen assembly structure according to claim 1, wherein The shear adhesive strength of the characteristic adhesive is greater than 5 MPa.

4. The screen assembly structure according to any one of claims 1 to 3, characterized in that, The distance between the characteristic adhesive and the back adhesive is 2-5 mm.

5. The screen assembly structure according to any one of claims 1 to 3, wherein The characteristic adhesive comprises a top section and a side section, the top section is arranged close to the top edge of the screen and covers at least the two ends of the top of the screen, the side section is arranged close to the side edge of the screen and covers at least part of the side edge of the screen, and the side section is connected with the top section.

6. The screen assembly structure according to claim 5, wherein The upper end of the side section is connected with the top section, and the lower end of the side section extends close to the bottom edge of the screen.

7. The screen assembly structure according to claim 5, wherein The top section completely covers the top of the screen.

8. The screen assembly structure according to claim 5, wherein The characteristic adhesive further comprises a bottom section, the bottom section is arranged close to the bottom edge of the screen, and the bottom section extends from the side edge of the screen to the center of the screen by a preset distance.

9. The screen assembly structure according to any one of claims 1 to 3, wherein The back adhesive is arranged around the periphery of the characteristic adhesive.

10. The screen assembly structure according to any one of claims 1 to 3, wherein The color of the characteristic adhesive is black.

11. The screen assembly structure according to any one of claims 1 to 3, wherein The screen comprises: a display module; a cover plate, which is arranged on the side surface of the display module away from the middle plate part.

12. The screen assembly structure according to claim 11, wherein Further comprising: a side sealing adhesive, which is arranged on the side wall of the display module, covers at least the position of the sound outlet seam of the screen and avoids the bottom edge of the screen.

13. The screen assembly structure according to claim 12, wherein The side wall of the screen and the frame part have a protection seam, and the screen assembly structure further comprises: a filling adhesive, which is filled in the protection seam and is disconnected at the position of the sound outlet seam.

14. The screen assembly structure according to claim 13, wherein The side sealing adhesive covers the position of the sound outlet seam of the screen, and the screen assembly structure further comprises: a dam adhesive, which is arranged on both sides of the sound outlet seam and connects the filling adhesive and the side sealing adhesive.

15. The screen assembly structure according to claim 12, wherein The frame part protrudes a step part towards the screen, the step part is protruded on the side of the middle plate part towards the screen, and the step part is at least located at the bottom edge of the screen; The step part is located on the outside of the display module, the cover plate is overlapped on the step part, and a step adhesive is arranged between the cover plate and the step part.

16. The screen assembly structure according to claim 15, wherein The side sealing adhesive covers the top edge and the side edge of the screen, the step adhesive covers the bottom edge of the screen, and the screen assembly structure further comprises: a dam adhesive, which is arranged at both ends of the bottom edge of the screen and connects the step adhesive and the side sealing adhesive.

17. A method of assembling a screen, characterized by The application further relates to a screen assembly method, which comprises the following steps: providing a screen, the back of the screen is provided with a back adhesive; coating a characteristic adhesive on the back of the screen, so that the characteristic adhesive is spaced apart from the back adhesive; attaching the screen to the middle plate part of a middle frame.

18. The screen assembly method of claim 17, wherein, Before the screen is attached to the middle plate part of the middle frame, the method further comprises the following step: coating a filling adhesive on the frame part of the middle frame.

19. The screen assembly method of claim 18, wherein, After the screen is attached to the middle plate part of the middle frame, the method further comprises the steps of: The sealant and the special adhesive are cured to securely attach the screen to the mid-frame.

20. An electronic device, comprising: Includes a back cover and a screen assembly structure as described in any one of claims 1-16, wherein the back cover is connected to the side of the mid-frame opposite to the screen.

Images