Screen component assembling structure, assembling method thereof and electronic equipment

Abstract

A screen assembly assembly structure (10), an assembly method therefor, and an electronic device (1), the screen assembly assembly structure (10) being configured in such a manner that a protective seam is formed between a side wall of a screen assembly (100) and a frame portion (212), the screen assembly (100) and the frame portion (212) being not in lap joint, and a narrow frame effect can be achieved. On the basis, the protective seam is filled with a protective glue layer (400) to block the protective seam, and the protective glue layer (400) is used for protecting the whole machine. Wherein the protective adhesive layer (400) is provided with a high-modulus part (410) and a low-modulus part (420), the high-modulus part (410) is located on the side, away from a middle plate part (211) of the middle frame (210), of the low-modulus part (420), the high-modulus part (410) is high in modulus and high in hardness, the low-modulus part (420) is low in modulus and good in elasticity, and therefore the protective adhesive layer (400) can play a protective role and a buffering role at the same time; therefore, external foreign matters can be prevented from entering the display screen (110), the working performance of the display screen (110) is protected, buffering can be provided between the frame part (212) of the middle frame (210) and the side wall of the screen assembly (100), and the screen assembly (100) is prevented from being damaged.

Description

Screen assembly assembly structure and assembly method thereof, and electronic equipment

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on November 28, 2022, with application number 202211502488.9 and application name “Screen component assembly structure and assembly method thereof, electronic device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of electronic equipment, and in particular to a screen assembly structure and an assembly method thereof, and electronic equipment. Background Art

[0003] With the advancement of technology, the display screens of electronic devices (such as mobile phones) are increasingly pursuing extremely narrow bezels to achieve a larger screen-to-body ratio.

[0004] The screen-to-body ratio of a display depends largely on how the display is packaged. To increase the screen-to-body ratio of electronic devices, adhesive is typically used to bond the back of the display to the middle frame. A narrow gap is left between the side wall of the display and the inner wall of the middle frame. This gap provides an assembly gap between the display and the middle frame, and protects the display from being damaged by the middle frame in risky scenarios such as collisions and falls.

[0005] However, due to the narrow gap between the display and the middle frame, dust easily accumulates in the gap, and there is a risk of protection failure during long-term use.

[0006] Summary of the Invention

[0007] The present application provides a screen component assembly structure and an assembly method thereof, and an electronic device. The screen component assembly structure has good protection effect on the basis of achieving a narrow frame, and can improve the reliability of the electronic device.

[0008] In a first aspect, the present application provides a screen assembly assembly structure, comprising a screen assembly, a middle frame, and a protective adhesive layer;

[0009] The middle frame includes a middle plate portion and a frame portion, wherein the frame portion is arranged around the periphery of the middle plate portion; the screen assembly is supported on the middle plate portion, and a protective gap is formed between the side wall of the screen assembly and the frame portion, and the protective adhesive layer is filled in the protective gap;

[0010] Among them, along the thickness direction of the screen assembly, the protective adhesive layer is divided into a high modulus portion and a low modulus portion, and the high modulus portion is located on the side of the low modulus portion away from the middle plate portion.

[0011] The screen assembly assembly structure provided by the present application can achieve a narrow frame effect by setting the side wall of the screen assembly and the frame portion in the form of a protective seam, and there is no overlap between the screen assembly and the frame portion. On this basis, by filling the protective seam with a protective adhesive layer, the protective seam is sealed by the protective adhesive layer, and the entire machine is protected by the protective adhesive layer. Among them, by making the protective adhesive layer have a high modulus portion and a low modulus portion, and the high modulus portion is located on the side of the middle plate portion of the low modulus portion away from the middle frame, the high modulus portion has a higher modulus and high hardness, and the low modulus portion has a lower modulus and good elasticity, the protective adhesive layer can play a protective role and a buffering role at the same time, which can prevent foreign matter from entering the display screen and protect the working performance of the display screen. At the same time, it can also provide a buffer between the frame portion of the middle frame and the side wall of the screen assembly to prevent the screen assembly from being damaged.

[0012] In one possible implementation, the screen assembly includes a display screen and a protective cover plate, wherein the display screen is connected to the middle plate portion, and the protective cover plate is located on a side of the display screen facing away from the middle plate portion;

[0013] The high modulus portion extends from the side of the protection cover plate toward the side of the display screen, and the low modulus portion covers at least a portion of the side of the display screen.

[0014] By extending the high-modulus portion from the protective cover toward the side of the display screen, the high-modulus portion is located on the exterior side of the screen assembly, providing both bonding and protection, thereby safeguarding the display screen's performance. By covering at least a portion of the side of the display screen, the low-modulus portion provides a cushioning effect, absorbing the impact of the middle frame's frame on the display screen's sidewalls and protecting the display screen from damage.

[0015] In a possible implementation, one end of the side wall of the display screen facing the protective cover is located within the range covered by the low modulus portion.

[0016] By positioning the end of the side wall of the display screen facing the protective cover within the coverage of the low-modulus portion, only the low-modulus portion exists within the thickness region of the side of the display screen. The low-modulus portion can more easily fill the gap between the display screen and the frame portion. Furthermore, the low-modulus portion maximizes the buffer area on the side of the display screen, providing better protection for the display screen.

[0017] In a possible embodiment, the end of the frame portion extending toward the side of the protective cover plate is its front end surface, and the protective adhesive layer extends from the front end surface toward the middle plate portion.

[0018] By aligning the top of the protective adhesive layer with the front end of the frame, the fluid adhesive remains within the protective seam during application. The support provided by the frame facilitates the curing of the protective adhesive into a protective adhesive layer. Furthermore, after curing, the protective adhesive layer remains almost entirely within the shielding area of ​​the frame, protecting it from scratches and wear.

[0019] In a possible implementation, a backing adhesive layer is provided between the display screen and the middle plate portion.

[0020] In a possible implementation, the display screen is an OLED display screen.

[0021] In a possible implementation, a ground layer is provided on a side of the OLED display screen facing the middle plate portion, and the protective adhesive layer extends to contact the surface of the ground layer.

[0022] By extending the protective adhesive layer to contact the surface of the ground layer, the protective adhesive layer conducts the protective cover and the ground layer, which can eliminate the static charge adsorbed on the surface of the protective cover and solve problems such as green screen, uneven brightness, and screen flicker.

[0023] In a possible implementation, the protective adhesive layer extends to engage with an end surface of the back adhesive layer.

[0024] By extending the protective adhesive layer to join with the back adhesive layer, it can be ensured that the protective adhesive layer completely fills the protective gap, ensuring that the protective adhesive layer has good protection and buffering effects, and it can be ensured that the protective adhesive layer extends to the back of the OLED display screen so that the protective adhesive layer is in stable contact with the ground layer.

[0025] In a possible implementation, the display screen is an LCD display screen.

[0026] In a possible implementation, at least one side of the LCD display screen is connected to a circuit board, the circuit board is located in the protective gap, and the protective adhesive layer is supported on the circuit board.

[0027] In one possible implementation, the modulus of the high modulus portion is in the range of 40 MPa to 70 MPa, and the modulus of the low modulus portion is in the range of 5 MPa to 35 MPa.

[0028] By controlling the modulus of the high-modulus portion of the protective adhesive layer between 40Mpa and 70Mpa, the high-modulus portion possesses a higher hardness, ensuring a tight and secure connection between the screen assembly and the frame, enhancing the protective effect. By controlling the modulus of the low-modulus portion of the protective adhesive layer between 5Mpa and 35Mpa, the low-modulus portion possesses sufficient elastic deformation properties, ensuring complete gap filling and protecting the display from damage.

[0029] In a possible implementation, the protective adhesive layer is an adhesive layer formed by curing the first curing method and the second curing method.

[0030] The protective adhesive layer is cured and formed by two different curing methods, namely the first curing method and the second curing method, so that the protective adhesive layer has a high modulus portion and a low modulus portion with different moduli, so that the protective adhesive layer can play both a bonding and fixing role and a buffering role.

[0031] In a possible implementation, the first curing method is a light curing method, and the second curing method is a moisture curing method.

[0032] The portion of the protective adhesive layer close to the protective cover plate is formed into a high modulus portion through light curing and moisture curing, and the portion of the protective adhesive layer close to the middle plate portion of the middle frame is formed into a low modulus portion through moisture curing.

[0033] In a possible implementation, along the thickness direction of the screen assembly, the depth of the high modulus portion ranges from 0.4 mm to 0.6 mm.

[0034] In a second aspect, the present application provides a screen assembly assembly method, comprising:

[0035] Apply protective glue on the border of the middle frame;

[0036] Install the screen assembly on the middle frame, squeezing the protective glue on the side walls of the screen assembly;

[0037] The protective adhesive is cured to form a protective adhesive layer, wherein the protective adhesive layer has a high modulus portion and a low modulus portion, and the high modulus portion is located on a side of the low modulus portion away from the middle plate portion of the middle frame.

[0038] The screen assembly assembly method provided in the present application is to coat protective glue on the frame portion of the middle frame, and through the extrusion of the screen assembly, the protective glue layer can be tightly connected between the screen assembly and the frame portion, and then the protective glue is cured to form a protective glue layer. Among them, by making the formed protective glue layer have a high modulus portion and a low modulus portion, and the high modulus portion is located on the side of the low modulus portion away from the middle plate portion of the middle frame, the high modulus portion has a higher modulus and high hardness, and the low modulus portion has a lower modulus and good elasticity, the protective glue layer can play a protective role and a buffering role at the same time, which can prevent foreign matter from entering the display screen and protect the working performance of the display screen. At the same time, it can also provide a buffer between the frame portion of the middle frame and the side wall of the screen assembly to prevent the screen assembly from being damaged.

[0039] In one possible embodiment, curing the protective adhesive includes:

[0040] The protective adhesive is cured by adopting a first curing method and a second curing method, so that the protective adhesive layer forms a high modulus portion and a low modulus portion.

[0041] By adopting two different curing methods, the first curing method and the second curing method, to jointly cure the protective adhesive, the formed protective adhesive layer can have a high modulus portion and a low modulus portion with different moduli, so that the protective adhesive layer can play both a bonding and fixing role and a buffering role.

[0042] In one possible embodiment, the first curing method is a light curing method, and the second curing method is a moisture curing method. Curing the protective adhesive includes:

[0043] Exposing the protective adhesive to light on a side facing away from the middle plate to cure the protective adhesive by light curing;

[0044] The protective adhesive is allowed to react with air to cure the protective adhesive by moisture curing.

[0045] During the curing process, the protective glue will react with water molecules in the air and undergo moisture curing. At the same time, by irradiating the protective glue on the side away from the middle plate, the part of the protective glue layer close to the protective cover plate will form a high modulus part through light curing and moisture curing, and the part of the protective glue layer close to the middle plate of the middle frame will form a low modulus part through moisture curing.

[0046] In a possible implementation, applying protective glue on the border portion of the middle frame includes:

[0047] The middle frame is tilted at a preset angle so that the inner side wall of the frame portion is tilted toward the spraying direction of the protective glue; wherein the inner side wall of the frame portion is a side wall surface of the frame portion facing the middle plate portion of the middle frame.

[0048] By tilting the middle frame, the inner side wall of the frame portion is tilted toward the spraying direction of the protective glue. The area of ​​the inner side wall of the frame portion that receives the protective glue is larger. The tilted inner side wall of the frame portion can hinder the protective glue from flowing along its surface, so that the protective glue can be stabilized on the inner side wall of the frame portion. In addition, the front end surface of the frame portion is also covered with protective glue of sufficient thickness, so that the protective glue can be stably covered on the frame portion.

[0049] In a possible implementation manner, before curing the protective adhesive, the method further includes:

[0050] Wipe off the protective glue that overflows on the front end surface of the frame portion so that the surface of the protective glue is flush with the front end surface of the frame portion.

[0051] In a third aspect, the present application provides an electronic device, comprising a back cover and the screen assembly structure as described above, wherein the back cover is connected to the middle frame, and the back cover is located on the side of the middle frame facing away from the screen assembly.

[0052] The electronic device provided by the present application includes a screen component assembly structure and a back cover. The screen component assembly structure is formed by setting the side wall of the screen component and the frame portion in the form of a protective seam, and there is no overlap between the screen component and the frame portion, so that a narrow frame effect can be achieved. On this basis, a protective adhesive layer is filled in the protective seam, the protective adhesive layer blocks the protective seam, and the protective adhesive layer is used to protect the entire machine. Among them, by making the protective adhesive layer have a high modulus portion and a low modulus portion, and the high modulus portion is located on the side of the middle plate portion of the low modulus portion away from the middle frame, the high modulus portion has a higher modulus and high hardness, and the low modulus portion has a lower modulus and good elasticity, the protective adhesive layer can play a protective role and a buffering role at the same time, which can prevent foreign matter from entering the display screen and protect the working performance of the display screen. At the same time, it can also provide a buffer between the frame portion of the middle frame and the side wall of the screen assembly to prevent the screen assembly from being damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] FIG1 is a schematic structural diagram of an electronic device provided in an embodiment of the present application;

[0054] FIG2 is an exploded view of the electronic device shown in FIG1 ;

[0055] FIG3 is a schematic diagram of a structure in which a screen assembly is assembled on a middle frame in the related art;

[0056] FIG4 is a schematic diagram of the structure of another screen assembly assembled on a middle frame in the related art;

[0057] FIG5 is a schematic diagram of the structure of a third screen assembly assembled on a middle frame in the related art;

[0058] FIG6 is a schematic diagram of the structure of a fourth screen assembly assembled on a middle frame in the related art;

[0059] FIG7 is a schematic diagram of the layered structure of the glue between the screen assembly and the frame portion in FIG6( a );

[0060] FIG8 is a schematic structural diagram of a screen assembly structure provided in an embodiment of the present application;

[0061] FIG9 is a schematic structural diagram of another screen assembly structure provided in an embodiment of the present application;

[0062] FIG10 is a flowchart of the steps of the assembly method provided in an embodiment of the present application;

[0063] FIG11 is a process flow chart of a screen assembly structure provided by an embodiment of the present application;

[0064] FIG12 is a process flow chart of another screen assembly structure provided in an embodiment of the present application.

[0065] Explanation of the accompanying reference numerals: 1-electronic device; 10-screen assembly assembly structure; 2-nozzle; 3-light source; 100-screen assembly; 200-housing; 300-adhesive layer; 400-protective adhesive layer; 400a-protective adhesive; 110-display screen; 120-protective cover; 130-circuit board; 210-middle frame; 220-back cover; 410-high modulus portion; 420-low modulus portion; 110a-OLED display screen; 110b-LCD display screen; 211-middle plate portion; 212-frame portion; 2121-positioning groove; 101-screen assembly; 102-middle frame; 103-adhesive layer; 104-adhesive layer; 105-side sealing glue; 106-glue; 1011a - OLED display; 1011b - LCD display; 1012 - cover plate; 1021 - middle plate; 1022 - frame; 1022a - step surface; 1061 - support glue; 1062 - gap filling glue. DETAILED DESCRIPTION

[0066] The terms used in the implementation section of this application are only used to explain the specific embodiments of this application and are not intended to limit this application.

[0067] An embodiment of the present application provides an electronic device, which may be a consumer electronic product. Exemplary electronic devices include, but are not limited to, mobile phones, tablet computers (portable Android devices, PADs), notebook computers (NoteBook computers, abbreviated as NoteBooks), ultra-mobile personal computers (UMPCs), walkie-talkies, netbooks, POS (Point of Sales) machines, personal digital assistants (PDAs), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, and the like.

[0068] Figure 1 is a schematic structural diagram of an electronic device provided in an embodiment of the present application. Referring to Figure 1, taking the electronic device 1 as a mobile phone as an example, the electronic device 1 may include a screen assembly 100 and a housing 200. One side surface of the screen assembly 100 is used to display image information. This side surface of the screen assembly 100 is usually defined as its front side, and the other side surface opposite to its front side is its back side. The housing 200 is arranged around the sides and back of the screen assembly 100 to support, fix, and protect the screen assembly 100. The front side of the screen assembly 100 is exposed outside the housing 200 for the user to view the content displayed by the screen assembly 100 or to perform input operations on the electronic device 1.

[0069] Typically, the side surface on which the screen assembly 100 is located is defined as the front surface of the electronic device 1, and the other side surface of the electronic device 1 opposite to the front surface is defined as the back surface thereof. When describing the components of the electronic device 1 below, corresponding to the front and back surfaces of the electronic device 1, the "front surface" of a component refers to the side surface of the component facing the front of the electronic device 1, and the "back surface" of a component refers to the side surface of the component facing the back of the electronic device 1.

[0070] FIG2 is an exploded view of the electronic device shown in FIG1 . Referring to FIG2 , the housing 200 of the electronic device 1 may include a middle frame 210 and a back cover 220 . The middle frame 210 is connected between the screen assembly 100 and the back cover 220 . The screen assembly 100 is supported on the front of the middle frame 210 , and the back cover 220 is connected to the back of the middle frame 210 . The screen assembly 100 is usually supported on the middle frame 210 as a whole to ensure the strength and stability of the screen assembly 100 and meet the use requirements of the screen assembly 100 . The back cover 220 is usually connected and fixed to the middle frame 210 in an overlapping manner. A storage space is enclosed between the middle frame 210 and the back cover 220 . The storage space is used to set components such as the circuit board 130 , the battery, the camera module, and the microphone.

[0071] The middle frame 210 may include a middle plate portion 211 and a frame portion 212. The middle plate portion 211 is located between the screen assembly 100 and the back cover 220 and is arranged parallel to the screen assembly 100 and the back cover 220. The frame portion 212 is arranged around the periphery of the middle plate portion 211. The frame portion 212 is generally perpendicular to the plate surface of the middle plate portion 211 and extends to both sides of the middle plate portion 211. The screen assembly 100 and the back cover 220 can both be located within the area enclosed by the frame portion 212. For example, the frame portion 212 and the middle plate portion 211 can be an integrally formed structure.

[0072] The screen assembly 100 is typically connected to the middle plate 211 in an integrally bonded manner. The middle plate 211 supports the screen assembly 100, ensuring a stable and secure support for the screen assembly 100. This provides sufficient strength to withstand frequent use. The frame 212 surrounds the screen assembly 100, protecting its edges and shielding it from damage, such as collisions and falls.

[0073] The side of the frame portion 212 of the middle frame 210 facing the back cover 220 is typically provided with an overlapping edge. The back cover 220 overlaps and is fixedly connected to the overlapping edge of the frame portion 212. For example, the back cover 220 can be adhered to the overlapping edge of the frame portion 212 using adhesive. There is typically a gap between the back cover 220 and the middle plate portion 211 of the middle frame 210. This gap forms the aforementioned accommodation space for arranging devices within the accommodation space between the middle plate portion 211 of the middle frame 210 and the back cover 220. To improve the connection strength between the back cover 220 and the middle frame 210, in some examples, support structures such as retaining walls and support columns are typically provided between the middle plate portion 211 of the middle frame 210 and the back cover 220. These support structures are supported between the middle plate portion 211 and the back cover 220, which can enhance the strength of the back cover 220 and prevent the back cover 220 from being deformed by force. In addition, these support structures can also serve as positioning structures or mounting structures for devices within the accommodation space.

[0074] The following mainly describes the structure of the screen assembly 100 assembled on the middle frame 210.

[0075] Figure 3 is a schematic diagram of a screen assembly assembled to a midframe in the related art; Figure 4 is a schematic diagram of another screen assembly assembled to a midframe in the related art. Referring to Figures 3 and 4 , the screen assembly 101 is illustrated as an example of an OLED (Organic Light-Emitting Diode) display. Specifically, the screen assembly 101 may include an OLED display 1011a and a cover 1012 disposed over the OLED display 1011a.

[0076] It should be noted that the screen-to-body ratio of the screen assembly 101 is generally determined by the width of the cover plate 1012 extending beyond the OLED display screen 1011a (the width between the two vertical dashed lines shown in Figures 3 and 4). In other words, the greater the width of the cover plate 1012 extending beyond the OLED display screen 1011a, the greater the black border width of the screen assembly 101, the wider the border of the screen assembly 101, and the lower the screen-to-body ratio; the smaller the width of the cover plate 1012 extending beyond the OLED display screen 1011a, the smaller the black border width of the screen assembly 101, the narrower the border of the screen assembly 101, and the higher the screen-to-body ratio.

[0077] Among them, as shown in Figure 3, in some current solutions, in order to achieve the effect of a narrow bezel, the screen assembly 101 is only bonded to the middle plate portion 1021 of the middle frame 102 through the adhesive layer 103. The width of the cover plate 1012 extending outside the OLED display screen 1011a is very small, and there is no overlap between the cover plate 1012 and the bezel portion 1022 of the middle frame 102. In this way, the black border width d of the screen assembly 101 is very small, and the screen assembly 101 can achieve a narrow bezel effect, a high screen-to-body ratio, and a good appearance. At this time, there is a small gap between the side wall of the screen assembly 101 and the bezel portion 1022 of the middle frame 102, and the screen assembly 101 is protected by this gap.

[0078] However, due to the gap between the OLED display screen 1011a and the frame portion 1022 of the middle frame 102, the OLED display screen 1011a is at risk of shaking and has poor stability. Furthermore, during long-term use, dust easily accumulates in the gap, and external moisture easily enters the OLED display screen 1011a through the gap, which can easily lead to protection problems, such as causing bright spots on the OLED display screen 1011a, liquid intrusion, and electrostatic breakdown.

[0079] As shown in Figure 4, in order to make the whole machine have better protection effect, in some other current schemes, on the basis of the screen assembly 101 being bonded to the middle plate portion 1021 of the middle frame 102 through the back adhesive layer 103, a step surface 1022a is further provided on the frame portion 1022 of the middle frame 102, and the portion of the cover plate 1012 extending outside the OLED display screen 1011a is overlapped on the step surface 1022a of the frame portion 1022, and an adhesive layer 104 is provided between the cover plate 1012 and the step surface 1022a of the frame portion 1022, and the cover plate 1012 and the frame portion 1022 are bonded and connected by the adhesive layer 104. The adhesive layer 104 fills the gap between the screen assembly 101 and the frame portion 1022 of the middle frame 102. With the help of the adhesive layer 104, the whole machine is protected to prevent foreign matter such as external dust and water vapor from entering the OLED display screen 1011a, and the reliability of the whole machine is high.

[0080] Because the cover plate 1012 needs to overlap the stepped surface 1022a of the frame portion 1022, the cover plate 1012 extends a relatively wide width beyond the OLED display screen 1011a to ensure sufficient overlap between the cover plate 1012 and the stepped surface 1022a of the frame portion 1022. However, this increases the width of the black border of the screen assembly 101. The large black border width d of the screen assembly 101 prevents the screen assembly 101 from achieving a narrow-frame effect. Consequently, the screen assembly 101 has a low screen-to-body ratio and a poor appearance.

[0081] Figure 5 is a schematic diagram of a third screen assembly assembled to a midframe in the related art; Figure 6 is a schematic diagram of a fourth screen assembly assembled to a midframe in the related art. Referring to Figures 5 and 6 , the screen assembly 101 is illustrated as an example of an LCD (Liquid Crystal Display) display. Specifically, the screen assembly 101 may include an LCD display 1011b and a cover plate 1012 covering the LCD display 1011b.

[0082] As shown in Figure 5, similar to the screen assembly 101 equipped with an OLED display screen 1011a, in order to make the whole machine have a better protection effect, some current solutions, for the screen assembly 101 equipped with an LCD display screen 1011b, on the basis of bonding the screen assembly 101 to the middle plate portion 1021 of the middle frame 102 through the back adhesive layer 103, an annular step surface 1022a surrounding the frame portion 1022 can also be provided on the frame portion 1022 of the middle frame 102, and the side edges of the cover plate 1012 are overlapped on the step surface 1022a of the frame portion 1022, and the cover plate 1012 is connected to the step surface 1022a of the frame portion 1022 through the adhesive layer 104, and the adhesive layer 104 is used to protect the whole machine. However, in this manner, the cover 1012 extends outward from the LCD display screen 1011 b to a greater extent, and the black border width d of the screen assembly 101 is larger, and the narrow frame effect of the screen assembly 101 cannot be achieved.

[0083] As shown in FIG6 , in order to enhance the appearance of the screen assembly 101, in other embodiments, on the basis of bonding the screen assembly 101 to the middle plate portion 1021 of the middle frame 102 using the adhesive layer 103, a narrow-frame connection method is adopted for at least part of the side edges of the screen assembly 101. Referring to FIG6( a ), for part of the side edges of the screen assembly 101, for example, the top side of the screen assembly 101 (usually the side with the sound slit) and the left and right sides on both sides of the top side, the width of the cover plate 1012 extending outside the LCD display screen 1011b is very small, and there is no overlap between the cover plate 1012 and the frame portion 1022 of the middle frame 102, so that the corresponding side edges of the screen assembly 101 achieve a narrow-frame effect. As shown in Figure 6(b), the other side edges of the screen assembly 101, for example, the bottom edge of the screen assembly 101, still use a cover plate 1012 overlapped on the step surface 1022a of the frame portion 1022, and bonded to the frame portion 1022 through the adhesive layer 104.

[0084] It should be noted that the LCD display 1011b is different from the OLED display 1011a in that the LCD display 1011b has a liquid crystal cell structure, which includes two substrates and liquid crystal molecules sandwiched between the two substrates. Therefore, the packaging requirements for the LCD display 1011b are relatively high. The LCD display 1011b is provided with a sealing glue between the two substrates. In some cases, such as shown in Figure 6(a), side sealing glue 105 can also be provided on part of the side walls of the LCD display 1011b. The side sealing glue 105 is used to seal the side walls of the LCD display 1011b to prevent the LCD display 1011b from leaking. In addition, in order to ensure the sealing of the LCD display screen 1011b, the sides of the screen assembly 101 that are not overlapped with the frame portion 1022 are usually sealed by filling the gap between the screen assembly 101 and the frame portion 1022 with glue 106. The gap can be first filled with low-modulus support glue 1061, which plays a supporting and buffering role, and then filled with filler glue 1062 on the support glue 1061, which plays an appearance protection role.

[0085] However, for the case where different connection methods are used on each side of the screen assembly 101, taking the case where the bottom edge of the cover 1012 is overlapped on the step surface 1022a on the frame portion 1022 and glue 106 is filled between the remaining side edges of the screen assembly 101 and the frame portion 1022 as an example, the black border width of the bottom edge of the screen assembly 101 is large, and the black border widths of the remaining side edges are small. The black border widths of the four sides of the screen assembly 101 are quite different, which affects the appearance of the electronic device 1. In addition, referring to Figure 7, Figure 7 shows the layered structure of the glue between the screen assembly and the frame portion in Figure 6(a). When the glue 106 is filled between the screen assembly 101 and the frame portion 1022 of the middle frame 102, it is easy for the supporting glue 1061 to overflow to the appearance surface of the screen assembly 101. At this time, there is a layering defect between the supporting glue 1061 and the filling glue 1062 with different moduli, and there is a gap between the interface between the supporting glue 1061 and the filling glue 1062, which can easily cause the electronic device 1 to have problems such as orange peel appearance, liquid ingress, and electrostatic breakdown.

[0086] In view of this, the embodiment of the present application improves the assembly structure between the screen assembly 100 and the middle frame 210. For the sake of convenience, this embodiment defines the overall structure of the screen assembly 100 assembled in the middle frame 210 as the screen assembly 100 assembly structure. The screen assembly 100 assembly structure of this embodiment, by setting a protective adhesive layer 400 in the protective seam between the screen assembly 100 and the frame portion 1022 of the middle frame 210, while achieving a narrow frame, uses the protective adhesive layer 400 to protect the entire machine. The protective adhesive layer 400 can not only play the role of filling the appearance gap but also play a buffering role, which can improve the protection effect of the entire machine.

[0087] The following is a detailed description of the assembly structure of the screen assembly 100 according to the embodiment of the present application.

[0088] FIG8 is a schematic diagram of a screen assembly structure provided in an embodiment of the present application. Referring to FIG8 , in this embodiment, the screen assembly 100 is bonded to the middle plate portion 211 of the middle frame 210 via a backing adhesive layer 300. The adhesive material constituting the backing adhesive layer 300 is, for example, a pressure-sensitive adhesive. Exemplarily, the material constituting the backing adhesive layer 300 may include acrylic resin, silicone resin, silicone rubber, polyurethane resin, etc. The backing adhesive layer 300 used in the electronic device 1 may have high temperature resistance and aging resistance to meet the long-term use requirements of the electronic product.

[0089] Among them, the screen assembly 100 includes a display screen 110 and a protective cover plate 120 that are stacked. The display screen 110 is located on one side of the middle plate portion 211 of the screen assembly 100 close to the middle frame 210. The front of the display screen 110 is used to display image information, and the back of the display screen 110 is bonded to the middle plate portion 211 through the adhesive layer 300. The protective cover plate 120 is located on the side of the display screen 110 away from the middle plate portion 211. The protective cover plate 120 covers the front of the display screen 110. The protective cover plate 120 is used to protect the display screen 110 to prevent the display screen 110 from being damaged by scratches or bumps, thereby ensuring the normal operation of the display screen 110. In addition, the protective cover plate 120 is usually made of a relatively high-strength, transparent material. On the basis of ensuring that the protective cover plate 120 has sufficient strength to protect the display screen 110, it prevents the protective cover plate 120 from affecting the display effect of the display screen 110. Illustratively, the protective cover 120 may be a glass cover or a PET (Polyethylene terephthalate) cover.

[0090] For example, the protective cover 120 and the display screen 110 may be connected via an optically clear adhesive (OCA). In other words, an optical adhesive layer (not shown) may be provided between the protective cover 120 and the display screen 110. The optical adhesive layer has high transparency, a light transmittance of over 99%, strong adhesion, and is heat-resistant and UV-resistant. This ensures a secure connection between the protective cover 120 and the display screen 110. Furthermore, the optical adhesive layer may increase the brightness and contrast of the display screen 110, thereby enhancing the display quality of the screen assembly 100.

[0091] In addition, this embodiment defines the end of the border portion 212 of the middle frame 210 extending toward the side of the protective cover 120 as its front end face. In Figure 8, in order to facilitate the indication of the connection structure between the screen assembly 100 and the middle frame 210, the matching structure between the middle frame 210 and the back cover 220 is not shown. It should be understood that in actual applications, the border portion 212 of the middle frame 210 may also have a portion extending toward one side of the back cover 220, and the end of the border portion 212 extending toward the side of the back cover 220 is its rear end face.

[0092] In order to achieve the narrow bezel effect of the electronic device 1, in this embodiment, the screen assembly 100 and the bezel portion 212 of the middle frame 210 are non-overlapping, and a protective seam (not shown in the figure) is provided between the side wall of the screen assembly 100 and the bezel portion 212. On the one hand, the protective seam provides an assembly gap between the screen assembly 100 and the middle frame 210, so that the area enclosed by the bezel portion 212 of the middle frame 210 is slightly larger than the area of ​​the screen assembly 100, so that the screen assembly 100 can be smoothly mounted on the middle plate portion 211 of the middle frame 210; on the other hand, the protective seam provides basic protection for the screen assembly 100, preventing the bezel portion 212 of the middle frame 210 from directly contacting the side wall of the screen assembly 100, so as to prevent the bezel portion 212 from hard contact with the screen assembly 100 and causing damage to the screen assembly 100, for example, preventing the screen assembly 100 from being worn or having local bright spots.

[0093] Continuing with reference to Figure 8, for the structure forming a protective seam between the screen assembly 100 and the frame, since the protective cover 120 and the frame portion 212 of the middle frame 210 do not need to be overlapped and bonded, therefore, on the basis of ensuring that the protective cover 120 can completely cover the display screen 110 and can fully protect the display screen 110, the width of the protective cover 120 extending outside the display screen 110 (to the side of the display screen 110) can be very small, the black border width of the screen assembly 100 is very small, the screen assembly 100 has a narrow frame and a high screen-to-body ratio, which can meet the narrow frame requirements of the electronic device 1 and enhance the appearance of the electronic device 1.

[0094] On the basis of providing narrow gap protection between the screen assembly 100 and the frame portion 212 of the middle frame 210 in the form of a protective gap, in this embodiment, a protective adhesive layer 400 is further filled in the protective gap between the side wall of the screen assembly 100 and the frame portion 212. The protective gap is sealed by the protective adhesive layer 400, and the electronic device 1 is protected by the protective adhesive layer 400 to prevent foreign matter such as dust, water vapor, grease, etc. from entering the display screen 110 through the protective gap, thereby protecting the working performance of the display screen 110 and preventing problems such as liquid ingress and electrostatic breakdown from occurring in the display screen 110.

[0095] In some embodiments, the protective adhesive layer 400 can extend from the front end of the frame portion 212 of the middle frame 210 toward the middle plate portion 211. In other words, the top end of the protective adhesive layer 400 (the end of the protective adhesive layer 400 facing the exterior surface of the screen assembly 100) can be roughly flush with the front end of the frame portion 212. In actual applications, a fluid protective adhesive is typically applied to the protective seam, and then the protective adhesive is cured to form the protective adhesive layer 400. By aligning the top end of the protective adhesive layer 400 with the front end of the frame portion 212, the formation of the protective adhesive layer 400 is facilitated, and the frame portion 212 provides better protection for the protective adhesive layer 400.

[0096] During the application process, after applying the fluid protective adhesive to the protective seam, the protective adhesive that overflows above the front end of the frame portion 212 is wiped off, using the front end of the frame portion 212 as the interface. The protective adhesive remaining within the protective seam is supported by the frame portion 212, facilitating its curing. Furthermore, after the protective adhesive is cured, no portion of the protective adhesive is exposed above the frame portion 212. The protective adhesive layer 400 is almost entirely within the shielding area of ​​the frame portion 212. The frame portion 212 protects the protective adhesive layer 400 from scratches and wear, thereby maintaining its integrity. The protective adhesive layer 400 is thus stable and has a longer service life.

[0097] Among them, along the thickness direction of the screen assembly 100, the protective adhesive layer 400 can be divided into a high modulus portion 410 and a low modulus portion 420. The high modulus portion 410 is close to the front of the screen assembly 100, and the low modulus portion 420 is located on the side of the high modulus portion 410 facing the middle plate portion 211. In other words, the high modulus portion 410 is located on the side of the low modulus portion 420 away from the middle plate portion 211. The high modulus portion 410 has a higher modulus and higher hardness, while the low modulus portion 420 has a lower modulus and better elasticity. The high modulus portion 410 and the low modulus portion 420 of the protective adhesive layer 400 can simultaneously play a protective and buffering role, preventing foreign matter from entering the display screen 110 and protecting the working performance of the display screen 110. At the same time, it can also provide a buffer between the border portion 212 of the middle frame 210 and the side wall of the screen assembly 100 to prevent the screen assembly 100 from being damaged.

[0098] The high modulus portion 410 extends from the front side of the screen assembly 100 toward the middle plate portion 211 of the middle frame 210. Specifically, the high modulus portion 410 is located on the exterior side of the screen assembly 100 and extends from the side of the protective cover 120 toward the side of the display screen 110. The high modulus and hardness of the high modulus portion 410 provide excellent adhesion. The high modulus portion 410 allows the protective adhesive layer 400 to provide a long-term, stable seal for the protective seam, preventing foreign matter such as dust, moisture, and grease from entering the display screen 110 and protecting the display screen 110's performance. The protective rubber layer 400 mainly plays a role in protecting the entire machine through the high modulus part 410, which can ensure that the protective rubber layer 400 is not worn or scratched. During long-term use, especially in risk scenarios such as collision or falling, the high modulus part 410 can also ensure that the protective rubber layer 400 will not have deformation, cracks and other adverse phenomena, ensuring that the protective rubber layer 400 maintains a long-term and effective overall machine protection effect and extends the service life of the protective rubber layer 400.

[0099] The low modulus portion 420 is located between the high modulus portion 410 and the middle plate portion 211 of the middle frame 210. The low modulus portion 420 has a lower modulus, lower hardness, and better elasticity, and is capable of elastic deformation. The expansion coefficient of the low modulus portion 420 provides a stable guarantee for the protective adhesive layer 400 to fill the protective gap, and provides a support base for the high modulus portion 410. The low modulus portion 420 is mainly set to correspond to the area where the side of the display screen 110 is located. The low modulus portion 420 fills the gap between the side of the display screen 110 and the frame portion 212. The elastic properties of the low modulus portion 420 can play a good buffering role, avoiding hard contact between the frame portion 212 and the display screen 110, and protecting the display screen 110 from damage. Especially in risk scenarios such as collisions or falls, the low modulus portion 420 can absorb the impact force and prevent the display screen 110 from defects such as wear, broken bright spots, and gaps.

[0100] In addition, although the protective adhesive layer 400 has a high modulus portion 410 and a low modulus portion 420, it is still an integral adhesive layer. Compared with the aforementioned method of filling the support adhesive 1061 and the gap filling adhesive 1062 between the screen assembly 100 and the frame portion 212 of the middle frame 210, the protective adhesive layer 400 of this embodiment has good integrity, there is no delamination phenomenon within the adhesive layer, and there is no gap phenomenon at the delamination interface, which will not cause the appearance of orange peel, liquid ingress and electrostatic breakdown.

[0101] Depending on the extension depth of the high modulus portion 410 of the protective adhesive layer 400, the thickness region of the side of the display screen 110 includes both the high modulus portion 410 and the low modulus portion 420. In other words, the bottom side of the high modulus portion 410 extending toward the middle plate portion 211 of the middle frame 210 is higher than the plane of the back surface of the protective cover 120 (the side of the protective cover 120 facing the display screen 110). Alternatively, the thickness region of the side of the display screen 110 may only include the low modulus portion 420. In other words, the bottom side of the high modulus portion 410 extending toward the middle plate portion 211 of the middle frame 210 is lower than the plane of the front surface of the display screen 110 (the side of the display screen 110 facing the cover). In short, at least a portion of the thickness region of the side of the display screen 110 is covered by the low modulus portion 420, thereby protecting the display screen 110 from damage through the cushioning effect of the low modulus portion 420.

[0102] 8 , by controlling the extension depth of the high modulus portion 410 of the protective adhesive layer 400, the side end where the front of the display screen 110 is located is within the range covered by the low modulus portion 420. In other words, the end of the side wall of the display screen 110 facing the protective cover plate 120 is within the range covered by the low modulus portion 420. In this way, only the low modulus portion 420 exists within the thickness region where the side of the display screen 110 is located. First, with respect to the protective seam, the seam width between the side wall of the display screen 110 and the frame portion 212 of the middle frame 210 is slightly larger than the seam width between the protective cover plate 120 and the frame portion 212. The larger the range of the low modulus portion 420 covered within the thickness region where the side of the display screen 110 is located, the easier it is for the protective adhesive layer 400 to fill the gap between the display screen 110 and the frame portion 212. Furthermore, only the low modulus portion 420 exists in the thickness area on the side of the display screen 110 , maximizing the buffer area on the side of the display screen 110 . The protective adhesive layer 400 can better absorb impact force and provide better protection for the display screen 110 .

[0103] For example, the bottom side of the high modulus portion 410 of the protective adhesive layer 400 can be controlled to be approximately located at the interface between the protective cover plate 120 and the display screen 110. In other words, in the protective adhesive layer 400, the high modulus portion 410 and the low modulus portion 420 are approximately bounded by the interface between the protective cover plate 120 and the display screen 110. For the protective adhesive layer 400 extending from the top of the frame portion 212 toward the middle plate portion 211, it can ensure that the high modulus portion 410 has a sufficient extension depth to meet the bonding strength and protection requirements of the protective adhesive layer 400, and also maximize the coverage of the sidewalls of the display screen 110 by the low modulus portion 420, thereby ensuring the sealing effect of the protective adhesive layer 400 and the buffering protection effect on the display screen 110. It should be understood that the protective adhesive layer 400 is a monolithic adhesive layer, and the interface referred to here is not an interface with stratification that can be observed by the naked eye.

[0104] For example, the depth of the high modulus portion 410 of the protective adhesive layer 400 can be controlled within a range of 0.4 mm to 0.6 mm by adjusting the curing parameters of the protective adhesive layer 400. In this way, the protective adhesive layer 400 can have a high modulus portion 410 of sufficient depth, and the adhesive strength of the protective adhesive layer 400 is high, which can meet the connection strength requirements between the screen assembly 100 and the border portion 212 of the middle frame 210, and can effectively prevent foreign matter such as dust, water vapor, and grease from the external environment from entering the display screen 110. At the same time, the area below the high modulus portion 410 of the protective adhesive layer 400 is also deep enough to form a low modulus portion 420, which can meet the filling requirements and provide good buffer protection for the display screen 110.

[0105] For example, the depth of the high modulus portion 410 of the protective rubber layer 400 may be 0.42 mm, 0.44 mm, 0.46 mm, 0.48 mm, 0.50 mm, 0.52 mm, 0.54 mm, 0.56 mm, 0.58 mm, etc.

[0106] Regarding the modulus setting of the protective adhesive layer 400, the high modulus portion 410 of the protective adhesive layer 400 can have a modulus range of 40 MPa to 70 MPa, so that the high modulus portion 410 has a high hardness. The high modulus portion 410 provides the protective adhesive layer 400 with sufficient bonding strength, tightly and securely connecting the screen assembly 100 and the border portion 212 of the middle frame 210, thereby providing a good protective effect. For example, the modulus of the high modulus portion 410 of the protective adhesive layer 400 can be 45 MPa, 50 MPa, 55 MPa, 60 MPa, 65 MPa, etc.

[0107] The modulus of the low modulus portion 420 of the protective adhesive layer 400 can range from 5 MPa to 35 MPa, so that the low modulus portion 420 has sufficient elastic deformation properties. The low modulus portion 420 can completely fill the gaps and provide the protective adhesive layer 400 with a good cushioning effect, absorbing the impact force of the border portion 212 of the middle frame 210 on the display screen 110, thereby protecting the display screen 110 from damage. Exemplarily, the modulus of the low modulus portion 420 of the protective adhesive layer 400 can range from 5 MPa to 25 MPa. For example, the modulus of the low modulus portion 420 can be 8 MPa, 10 MPa, 12 MPa, 15 MPa, 18 MPa, 20 MPa, 22 MPa, etc.

[0108] Furthermore, the viscosity of the protective adhesive constituting the protective adhesive layer 400 can be 20,000-100,000 cps to ensure sufficient stability. After application, the protective adhesive can stably adhere to the frame portion 212 of the middle frame 210, ensuring that the protective adhesive layer 400 can tightly and securely connect the screen assembly 100 to the frame portion 212. For example, the viscosity of the protective adhesive layer 400 can be 30,000 cps, 40,000 cps, 50,000 cps, 60,000 cps, 70,000 cps, 80,000 cps, 90,000 cps, etc.

[0109] The protective adhesive comprising the protective adhesive layer 400 can have a thixotropy value greater than 2. It should be noted that the thixotropy of the protective adhesive refers to the property of the protective adhesive 400a whereby its shear stress decreases over time under a certain shear rate. Specifically, under agitation, the viscosity of the protective adhesive rapidly decreases, facilitating application; upon cessation, the viscosity of the protective adhesive immediately increases, preventing it from flowing freely. By ensuring that the thixotropy value of the protective adhesive comprising the protective adhesive layer 400 is greater than 2, the protective adhesive can be smoothly applied to the frame portion 212 of the middle frame 210 under the action of external forces. Furthermore, after application, the protective adhesive remains stably on the frame portion 212.

[0110] The elongation at break of the protective adhesive layer 400 after curing can be greater than 300%, so that the protective adhesive layer 400 has good toughness on the basis of sufficient bonding strength. Even in risk scenarios such as collision and falling, the protective adhesive layer 400 will not easily break and delaminate, so that the protective adhesive layer 400 can maintain good protective performance for a long time.

[0111] As for how to form the protective adhesive layer 400 having the high modulus portion 410 and the low modulus portion 420, in this embodiment, the protective adhesive layer 400 can be an adhesive layer formed by jointly curing the first curing method and the second curing method. The protective adhesive layer 400 is formed by curing by two different curing methods, so that the protective adhesive layer 400 has the high modulus portion 410 and the low modulus portion 420 with different moduli, so that the protective adhesive layer 400 can play both the bonding and fixing role and the buffering role.

[0112] In some embodiments, the main resin of the protective adhesive layer 400 can be composed of a light-curing resin and a moisture-curing resin. In other words, the protective adhesive layer 400 can be formed by both light-curing and moisture-curing methods. In this case, the first curing method mentioned above can be light-curing, such as UV (Ultraviolet Ray) light curing. The second curing method mentioned above can be moisture-curing. As the name suggests, moisture-curing is the reaction of the protective adhesive with moisture (water molecules) in the air to cure.

[0113] For example, after the protective glue is applied in the protective seam, a light source (such as a UV light source) is set on the side of the protective glue facing the protective cover plate 120, and the protective glue is irradiated with the light source 3, so that the part of the protective glue close to the protective cover plate 120 is photocured and moisture-cured to form a high modulus portion 410, while the part of the protective glue close to the middle plate portion 211 of the middle frame 210 is far away from the light source, so this part is only moisture-cured to form a low modulus portion 420.

[0114] Exemplarily, the components of the protective glue constituting the protective glue layer 400 may include: UV moisture dual-cure resin (mass fraction accounting for 10-50%), UV moisture dual-cure monomer (mass fraction accounting for 5-40%), polyurethane prepolymer (mass fraction accounting for 2-10%), photoinitiator (mass fraction accounting for 0.5-5%), silane coupling agent (mass fraction accounting for 0.5-5%), moisture curing catalyst (mass fraction accounting for 0.5-5%), rheology modifier (mass fraction accounting for 0.5-5%), pigment (mass fraction accounting for 0.5-5%), etc.

[0115] Among them, the UV moisture dual-curing resin can be a resin containing an isocyanate group and a free radical polymerizing group; the UV moisture dual-curing monomer can be a monomer compound or mixture containing an isocyanate group and a free radical polymerizing group; the polyurethane prepolymer can be a compound whose terminal group is an isocyanate group when reacted with a polyol and an isocyanate curing agent; the photoinitiator can include at least one of benzophenone-based compounds, acetophenone-based compounds, acylphosphine oxide-based compounds, titanocene-based compounds, oxime ester-based compounds, benzoin ether-based compounds, and thioxanthone; the silane coupling agent can include at least one of an amino coupling agent containing methoxysilane or ethoxysilane with a hydrolyzable functional group, an epoxy silane coupling agent, a mercaptosilane coupling agent, and the like; the moisture curing catalyst can include at least one of an organic tin compound, an α-silane coupling agent, and a titanate compound; the rheology modifier can include at least one of silicon dioxide, calcium carbonate, and barium sulfate; the pigment can be a black pigment, and the black pigment can include at least one of carbon black, carbon nanotubes, and graphene.

[0116] Continuing with reference to FIG8 , the figure takes the display screen 110 carried by the screen assembly 100 as an OLED display screen 110 as an example for explanation. The back of the OLED display screen 110 is bonded to the middle plate portion 211 of the middle frame 210 through the back adhesive layer 300. The width of the protective cover 120 extending out of the side of the OLED display screen 110 is very narrow. The protective adhesive layer 400 fills the protective gap formed between the protective cover 120 and the OLED display screen 110 and the frame portion 212 of the middle frame 210. The protective adhesive layer 400 serves as an appearance filling role, giving the screen assembly 100 a narrow frame effect, and the buffering effect of the protective adhesive layer 400 can protect the OLED display screen 110 from damage.

[0117] Typically, a grounding layer (not shown) is provided on the side of the OLED display screen 110 facing the middle plate portion 211 of the middle frame 210. The material constituting the grounding layer is, for example, copper foil. The grounding layer can provide electromagnetic shielding and anti-static properties, thereby improving the operating performance of the electronic device 1. With reference to FIG8 , the assembly structure 10 of the screen assembly 100 equipped with the OLED display screen 110, in this embodiment, the protective adhesive layer 400 filled between the screen assembly 100 and the border portion 212 of the middle frame 210 can extend to the back of the OLED display screen 110 and contact the surface of the grounding layer on the back of the OLED display screen 110.

[0118] According to the characteristics of the adhesive material constituting the protective adhesive layer 400, the protective adhesive layer 400 generally has conductive properties. By extending the protective adhesive layer 400 to the back of the OLED display screen 110 and contacting the ground layer, the protective adhesive layer 400 is connected between the protective cover plate 120 and the ground layer. It can conduct the electrostatic charge attached to the surface of the protective cover plate 120 to the ground layer, thereby eliminating the harm caused by the electrostatic charge to the screen assembly 100.

[0119] OLED display 110 typically relies on thin-film transistors (TFTs), such as LTPS (Low Temperature Poly-silicon) TFTs, to drive pixel circuits. Static electricity can increase the leakage current of the TFTs, leading to issues such as pixel inability to shut down and insufficient charging time. Specifically, this can result in a green screen (due to increased leakage current of the TFTs, causing the green pixel with the lowest turn-on voltage to remain permanently lit), uneven brightness, and screen flicker. This means that this embodiment, by connecting the protective cover 120 and the ground layer of the OLED display 110 through a protective adhesive layer 400, can eliminate static electricity and resolve issues such as green screen, uneven brightness, and screen flicker.

[0120] When forming the protective adhesive layer 400, the amount of adhesive applied can be controlled. After the screen assembly 100 is installed on the middle frame 210, the protective adhesive layer 400 is squeezed by the screen assembly 100 so as to extend to join the end face of the back adhesive layer 300. On the one hand, this ensures that the protective adhesive layer 400 completely fills the protective gap between the screen assembly 100 and the border portion 212 of the middle frame 210, ensuring that the protective adhesive layer 400 has good protective and cushioning effects. On the other hand, in actual applications, there is usually a certain distance between the edge of the back adhesive layer 300 and the edge of the OLED display 110. By joining the protective adhesive layer 400 to the back adhesive layer 300, it can be ensured that the protective adhesive layer 400 extends to the back of the OLED display 110, thereby ensuring that the protective adhesive layer 400 is in stable contact with the ground layer on the back of the OLED display 110.

[0121] FIG9 is a schematic diagram of another screen assembly structure provided by an embodiment of the present application. Referring to FIG9 , the screen assembly 100 is provided with an LCD display 110b as an example for illustration. Similar to the aforementioned OLED display 110, the back of the LCD display 110b is bonded to the middle plate portion 211 of the middle frame 210 via a backing adhesive layer 300. The width of the protective cover 120 extending beyond the side of the LCD display 110b is very narrow. The protective adhesive layer 400 is filled in the protective gap formed between the protective cover 120 and the LCD display 110b and the frame portion 212 of the middle frame 210. The protective adhesive layer 400 acts as a filler to give the screen assembly 100 a narrow frame effect. The buffering effect of the protective adhesive layer 400 can protect the LCD display 110b from damage.

[0122] In particular, based on the characteristics of the LCD display 110b, as shown in FIG9(a), the structure of several sides (e.g., the top, left, and right sides) of the screen assembly 100 equipped with the LCD display 110b is similar to that of the screen assembly 100 equipped with the OLED display 110. For these sides of the screen assembly 100, the protective adhesive layer 400 is filled between the sidewalls of the screen assembly 100 and the border portion 212 of the middle frame 210. Since the grounding layer of the OLED display 110 does not exist on the side where the back of the LCD display 110b is located, the protective adhesive layer 400 can be extended to the back of the LCD display 110b by controlling the amount of adhesive applied. Alternatively, as shown in FIG9(a), the protective adhesive layer 400 can be filled only within the protective seam, and a gap can be provided between the protective adhesive layer 400 and the middle plate portion 211 of the middle frame 210.

[0123] Referring to FIG. 9( b ), FIG. 9( b ) illustrates a circuit board 130 disposed on the side of the LCD display 110 b. In some embodiments, the circuit board 130 may be a circuit board 130 for driving the thin-film transistors of the LCD display 110 b; in other embodiments, the circuit board 130 may be a circuit board 130 for supplying current to a backlight source (not shown). It should be noted that, unlike the OLED display 110 , the LCD display 110 b requires a backlight source for illumination. The backlight source may be disposed to the side (one or both sides) of the LCD display 110 b. For example, the backlight source may be disposed on the bottom side of the LCD display 110 b. The backlight source may be, for example, a light-emitting diode disposed on the circuit board 130.

[0124] Whether it is the circuit board 130 that drives the thin film transistor to work or the circuit board 130 that delivers current to the backlight source, illustratively, the circuit board 130 can be an FPC (Flexible Printed Circuit board, flexible circuit board 130) shown in the figure, or the circuit board 130 can also be a PCB (Printed Circuit Board, printed circuit board 130). The circuit board 130 can, for example, be mounted on the inner side wall of the frame portion 212 of the middle frame 210 (the side wall of the frame portion 212 facing the middle plate portion 211). For example, a positioning groove 2121 is provided on the inner side wall of the frame portion 212 of the middle frame 210 shown in the figure. The positioning groove 2121 can be used to accommodate and position the circuit board 130.

[0125] Since the circuit board 130 occupies a certain space in the protective gap, the protective adhesive layer 400 filled in the protective gap can be supported on the circuit board 130. The protective adhesive layer 400 can extend downward from a position roughly flush with the front end surface of the frame portion 212 to be supported on the circuit board 130. The protective adhesive layer 400 can cover the side space of the protective cover 120 and part of the space on the side of the LCD display screen 110b.

[0126] The embodiment of the present application also provides a screen assembly 100 assembly method (hereinafter referred to as the assembly method), which is used to assemble the aforementioned screen assembly 100 assembly structure 10. The assembly method is described in detail below.

[0127] Figure 10 is a step flow chart of the assembly method provided in an embodiment of the present application; Figure 11 is a process flow chart of a screen component assembly structure provided in an embodiment of the present application; Figure 12 is a process flow chart of another screen component assembly structure provided in an embodiment of the present application.

[0128] 10 , the assembly method includes the following steps:

[0129] S100 , applying protective glue on the border portion of the middle frame.

[0130] Figure 11, using a screen assembly 100 equipped with an OLED display 110a as an example, illustrates the various stages of assembly of the screen assembly 100 onto the middle frame 210. Referring to Figure 11(a), fluid protective adhesive 400a is first applied to the frame portion 212 of the middle frame 210, primarily covering the front end and inner sidewall of the frame portion 212 (the side of the frame portion 212 facing the middle plate portion 211).

[0131] Since the protective glue 400a in a fluid state has a certain fluidity, in order to ensure that the formed protective glue layer 400 can completely fill the protective gap between the screen assembly 100 and the border portion 212 of the middle frame 210, it is necessary to make the coated fluid state protective glue 400a stably cover the border portion 212 of the middle frame 210. In this regard, in this embodiment, the middle frame 210 can be placed at an inclined angle at a preset angle. Taking the application of glue by dispensing as an example, the nozzle 2 for spraying the protective glue 400a can be located above the frame portion 212 of the middle frame 210, so that the inner wall of the frame portion 212 is inclined toward the spraying direction of the protective glue 400a. In this way, the area of ​​the inner wall of the frame portion 212 that receives the protective glue 400a is larger, and the inclined inner wall of the frame portion 212 can hinder the protective glue 400a from flowing along its surface, so that the protective glue 400a can be stabilized on the inner wall of the frame portion 212. In addition, the front end surface of the frame portion 212 is also covered with protective glue 400a of sufficient thickness, so that the protective glue 400a can be stably covered on the frame portion 212.

[0132] The aforementioned preset angle, i.e., the inclination angle of the middle frame 210, can be between 0° and 45°. In other words, the angle between the middle plate portion 211 of the middle frame 210 and the horizontal plane can be between 0° and 45°. For example, the angle between the middle plate portion 211 of the middle frame 210 and the horizontal plane can be 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, etc.

[0133] For example, a five-axis dispensing machine can be used to apply protective glue 400a. In addition to the three linear axes (X, Y, and Z), the five-axis dispensing machine also includes two rotary axes. It can complete spatial curved trajectories and can approach the workpiece from almost any angle. Compared to traditional vertical downward dispensing / coating, the five-axis dispensing machine's gluing process is more compact and robust, allowing for dispensing in narrow areas and avoiding collisions. Furthermore, the nozzle 2 can adjust its tilt angle in real time, meeting the dispensing / coating requirements of different areas and shapes on the workpiece, reducing manual intervention, and achieving a high degree of automation.

[0134] S200, install the screen assembly on the middle frame, and squeeze the protective glue on the side walls of the screen assembly.

[0135] As shown in Figure 11(b), after the fluid protective glue 400a is applied to the border portion 212 of the middle frame 210, the screen assembly 100 is then installed on the middle frame 210. A layer of adhesive layer 300 is previously applied to the middle plate portion 211 of the middle frame 210 (or the screen assembly 100). The screen assembly 100 is bonded to the middle plate portion 211 of the middle frame 210 through the adhesive layer 300. There is a gap between the side wall of the screen assembly 100 and the border portion 212 of the middle frame 210, which forms a protective seam. In addition, the side wall of the screen assembly 100 squeezes the protective glue 400a so that the protective glue layer 400 formed by subsequent curing can tightly connect the screen assembly 100 and the border portion 212 of the middle frame 210, ensuring that the protective glue layer 400 can play a sufficient protective role.

[0136] Before the screen assembly 100 is installed on the middle frame 210 , the protective cover 120 and the display screen 110 may be assembled together in advance. For example, the protective cover 120 and the display screen 110 may be connected together using the aforementioned optical adhesive.

[0137] It should be noted that the amount of protective adhesive 400a applied to the frame portion 212 of the middle frame 210 generally needs to be greater than the amount actually required to fill the protective gap, to ensure that the protective adhesive 400a completely fills the gap and tightly connects the screen assembly 100 to the frame portion 212. After the screen assembly 100 is installed on the middle frame 210, the screen assembly 100 squeezes out the excess protective adhesive 400a, and the excess protective adhesive 400a overflows onto the front surface of the frame portion 212. At this time, it is necessary to wipe off the protective glue 400a that overflows over the front end surface of the frame portion 212, as shown in Figure 11 (c), so that the surface of the protective glue 400a is roughly flush with the front end surface of the frame portion 212, and the protective glue 400a is almost entirely located in the protective seam. The frame portion 212 can support the protective glue 400a to position it, which is conducive to the curing and forming of the protective glue 400a. Moreover, after the protective glue 400a is cured and formed, the protective glue layer 400 is located in the shielding area of ​​the frame portion 212, and the frame portion 212 can protect the protective glue layer 400 from being scratched or worn.

[0138] In addition, this embodiment takes the example of first applying protective glue 400a to the frame portion 212 of the middle frame 210 and then installing the screen assembly 100 on the middle frame 210. In this way, it can ensure that the amount of protective glue 400a applied is sufficient, and through the squeezing effect of the screen assembly 100, it can ensure that the protective glue 400a is tightly filled between the screen assembly 100 and the frame portion 212. In other embodiments, as long as the protective glue 400a can fully fill the protective gap between the screen assembly 100 and the frame portion 212, the screen assembly 100 can also be first installed on the middle plate portion 211 of the middle frame 210, and a protective gap can be formed between the screen assembly 100 and the frame portion 212 of the middle frame 210. Thereafter, protective glue 400a is applied to the protective gap. Due to the fluidity of the protective glue 400a, the protective glue 400a can completely fill the width of the protective gap. This embodiment is not limited to this.

[0139] S300, curing the protective adhesive to form a protective adhesive layer.

[0140] 11( d ), after the screen assembly 100 is mounted on the middle frame 210 and the protective glue 400a is squeezed tightly and the excess protective glue 400a is wiped off, the protective glue 400a is cured to form a stable protective glue layer 400. The cured protective glue layer 400 has a high modulus portion 410 and a low modulus portion 420. The high modulus portion 410 is close to the front of the screen assembly 100, and the low modulus portion 420 is located on the side of the high modulus portion 410 facing the middle plate portion 211. In other words, the high modulus portion 410 is located on the side of the low modulus portion 420 facing away from the middle plate portion 211.

[0141] In this way, in the protective adhesive layer 400 formed, the high modulus portion 410 has a higher modulus and higher hardness, while the low modulus portion 420 has a lower modulus and better elasticity. The high modulus portion 410 and the low modulus portion 420 of the protective adhesive layer 400 can simultaneously play a protective and buffering role, which can prevent foreign matter from entering the display screen 110 and protect the working performance of the display screen 110. At the same time, it can also provide a buffer between the frame portion 212 of the middle frame 210 and the side wall of the screen assembly 100 to prevent the screen assembly 100 from being damaged.

[0142] For example, in the protective adhesive layer 400 , the modulus of the high modulus portion 410 may be in the range of 40 MPa to 70 MPa, and the modulus of the low modulus portion 420 may be in the range of 5 MPa to 35 MPa, which will not be further described.

[0143] In order to make the formed protective adhesive layer 400 have a high modulus portion 410 and a low modulus portion 420, as mentioned above, the protective adhesive layer 400 can be formed by jointly curing through two different curing methods, namely a first curing method and a second curing method. In other words, the protective adhesive 400a can be cured using the first curing method and the second curing method so that the formed protective adhesive layer 400 has a high modulus portion 410 and a low modulus portion 420.

[0144] The first curing method may be a light curing method, such as the UV curing method described above, and the second curing method may be a moisture curing method. To enable the protective adhesive 400a to be cured and formed by both light curing and moisture curing methods, the main resin constituting the protective adhesive 400a may be composed of both a light curing resin and a moisture curing resin. Furthermore, the protective adhesive 400a may also include components such as a polyurethane prepolymer, a photoinitiator, a silane coupling agent, a moisture curing catalyst, a rheology modifier, and a pigment, which will not be further described.

[0145] As shown in FIG11( d ), when curing the protective adhesive 400a, a light source 3 (e.g., a UV light source) is provided on the side of the protective adhesive 400a facing the protective cover 120. The light source 3 irradiates the protective adhesive 400a, causing the portion of the protective adhesive 400a near the protective cover 120 to undergo both light curing and moisture curing to form a high modulus portion 410. However, the portion of the protective adhesive 400a near the middle plate portion 211 of the middle frame 210, being farther from the light source 3, undergoes only moisture curing to form a low modulus portion 420. During the curing process, the entire protective adhesive 400a reacts with water molecules in the air to cure, a process known as moisture curing.

[0146] It should be explained that Figure 11 uses the display screen 110 carried by the screen assembly 100 as an example, where the display screen 110 is an OLED display screen 110a. In the case where a grounding layer (not shown in the figure) is provided on the back of the OLED display screen 110a, the amount of glue can be appropriately increased when applying the protective glue 400a. After the screen assembly 100 is installed on the middle frame 210, the protective glue 400a is squeezed to extend it to the back of the OLED display screen 110a, so that the protective glue 400a connects the protective cover 120 and the grounding layer on the back of the OLED display screen 110a to eliminate electrostatic charge and solve problems such as green screen, uneven brightness, and screen flicker.

[0147] As shown in Figure 12, Figure 12 takes the display screen 110 carried by the screen assembly 100 as an LCD display screen 110b as an example for explanation. The process flow of assembling the screen assembly 100 equipped with the LCD display screen 110b on the middle frame 210 is similar to the process flow of assembling the screen assembly 100 equipped with the OLED display screen 110a on the middle frame 210, and will not be repeated here.

[0148] 12( a ), for the side structures of the screen assembly 100 equipped with the LCD display 110 b , the sides having structures similar to those of the screen assembly 100 equipped with the OLED display 110 a , for example, the top, left, and right sides of the screen assembly 100 equipped with the LCD display 110 b , since there is no grounding layer on the back of the LCD display 110 b , when applying glue, the amount of glue on these sides can be controlled to be similar to the amount of glue on the screen assembly 100 equipped with the OLED display 110 a , so that the protective glue layer 400 extends to the back of the LCD display 110 b , or, as shown in FIG12( a ), the amount of glue applied on these sides can be appropriately reduced so that the protective glue layer 400 is only filled in the protective seam, and there is a gap between the protective glue layer 400 and the middle plate portion 211 of the middle frame 210 .

[0149] As shown in Figure 12(b), for the side of the screen assembly 100 equipped with the LCD display 110b where the circuit board 130 is located (e.g., the bottom side of the screen assembly 100), since the circuit board 130 occupies a certain space in the protective seam, the protective adhesive layer 400 formed can be supported on the circuit board 130. The protective adhesive layer 400 can cover the side space of the protective cover 120 and part of the space to the side of the LCD display 110b. Therefore, when applying glue, the amount of glue applied to this side can be reduced accordingly to avoid excessive glue overflow after the screen assembly 100 is installed on the middle frame 210, which would cause waste of the protective adhesive 400a.

[0150] In the description of the embodiments of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to a fixed connection, an indirect connection via an intermediate medium, internal communication between two components, or an interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of this application based on specific circumstances.

[0151] The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of the embodiments of this application and the above-mentioned drawings 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 in that: Including screen assembly, middle frame and protective rubber layer; The middle frame includes a middle plate portion and a frame portion, wherein the frame portion is arranged around the periphery of the middle plate portion; the screen assembly is supported on the middle plate portion, and a protective gap is formed between the side wall of the screen assembly and the frame portion, and the protective adhesive layer is filled in the protective gap; Among them, along the thickness direction of the screen assembly, the protective adhesive layer is divided into a high modulus portion and a low modulus portion, and the high modulus portion is located on the side of the low modulus portion away from the middle plate portion.

2. The screen assembly structure according to claim 1, characterized in that: The screen assembly includes a display screen and a protective cover plate, wherein the display screen is connected to the middle plate portion, and the protective cover plate is located on a side of the display screen away from the middle plate portion; The high modulus portion extends from a side of the protection cover plate to a side of the display screen, and the low modulus portion covers at least a portion of the side of the display screen.

3. The screen assembly structure according to claim 2, characterized in that: One end of the side wall of the display screen facing the protection cover is located within the range covered by the low modulus portion.

4. The screen assembly structure according to claim 2, characterized in that: One end of the frame portion extending toward the side of the protective cover plate is its front end surface, and the protective adhesive layer extends from the front end surface toward the middle plate portion.

5. The screen assembly structure according to any one of claims 2 to 4, characterized in that: A back adhesive layer is provided between the display screen and the middle plate portion.

6. The screen assembly structure according to claim 5, characterized in that: The display screen is an OLED display screen.

7. The screen assembly structure according to claim 6, characterized in that: A ground layer is provided on one side of the OLED display screen facing the middle plate portion, and the protective adhesive layer extends to contact the surface of the ground layer.

8. The screen assembly structure according to claim 7, characterized in that: The protective adhesive layer extends to be joined with the end surface of the back adhesive layer.

9. The screen assembly structure according to claim 5, characterized in that: The display screen is an LCD display screen.

10. The screen assembly assembly structure according to claim 9, characterized in that: At least one side of the LCD display screen is connected to a circuit board, the circuit board is located in the protective gap, and the protective adhesive layer is supported on the circuit board.

11. The screen assembly structure according to any one of claims 1 to 10, characterized in that: The modulus of the high modulus portion is in the range of 40 MPa to 70 MPa, and the modulus of the low modulus portion is in the range of 5 MPa to 35 MPa.

12. The screen assembly structure according to any one of claims 1 to 11, characterized in that: The protective adhesive layer is an adhesive layer formed by curing the first curing method and the second curing method.

13. The screen assembly structure according to claim 12, characterized in that: The first curing method is a light curing method, and the second curing method is a moisture curing method.

14. The screen assembly structure according to any one of claims 1 to 13, characterized in that: Along the thickness direction of the screen assembly, the depth of the high modulus portion ranges from 0.4 mm to 0.6 mm.

15. A screen assembly assembly method, characterized in that: include: Apply protective glue on the border of the middle frame; Installing the screen assembly on the middle frame, with the sidewall of the screen assembly squeezing the protective glue; The protective adhesive is cured to form a protective adhesive layer; wherein the protective adhesive layer has a high modulus portion and a low modulus portion, and the high modulus portion is located on a side of the low modulus portion away from the middle plate portion of the middle frame.

16. The screen assembly assembly method according to claim 15, characterized in that: The step of curing the protective adhesive comprises: The protective adhesive is cured by a first curing method and a second curing method, so that the protective adhesive layer forms a high modulus portion and a low modulus portion.

17. The screen assembly assembly method according to claim 16, characterized in that: The first curing method is a light curing method, the second curing method is a moisture curing method, and the curing of the protective adhesive includes: Exposing the protective adhesive to light on a side facing away from the middle plate portion to cure the protective adhesive by the light curing method; The protective adhesive is allowed to react with air to cure the protective adhesive through the moisture curing method.

18. The screen assembly assembly method according to any one of claims 15 to 17, characterized in that: The step of applying protective glue on the border portion of the middle frame includes: The middle frame is tilted at a preset angle so that the inner side wall of the frame portion is tilted toward the spraying direction of the protective glue; wherein the inner side wall of the frame portion is a side wall of the frame portion facing the middle plate portion of the middle frame.

19. The screen assembly assembly method according to any one of claims 15 to 18, characterized in that: Before curing the protective glue, the method further comprises: The protective glue overflowing on the front end surface of the frame portion is wiped off to make the surface of the protective glue flush with the front end surface of the frame portion.

20. An electronic device, characterized in that: It comprises a back cover and the screen assembly assembly structure according to any one of claims 1 to 14, wherein the back cover is connected to the middle frame, and the back cover is located on the side of the middle frame facing away from the screen assembly.

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