Curved screen laminating device and curved screen laminating method

Abstract

A curved screen laminating device (11) and laminating method. The curved screen laminating device (11) comprises a base (12), a backing plate (13), and a flexible pressing mold (14); the flexible pressing mold (14) comprises a planar pressing portion (141) and a curved pressing portion (142); the curved pressing portion (142) comprises a plurality of curved edge pressing portions (142a, 142a,) and a curved corner pressing portion (142b) located between any two adjacent curved edge pressing portions (142a, 142a,); and when a screen body (2) is laminated with curved cover glass (4), a pressure applied by the base (12) to the curved corner pressing portions (142b) is greater than a pressure applied by the base to the planar pressing portion (141).

Description

Curved screen bonding device and curved screen bonding method Technical Field

[0001] This application belongs to the field of display technology, and in particular relates to a curved screen bonding device and a curved screen bonding method. Background Technology

[0002] Currently, flexible display devices, including flexible screen smartphones, are gaining increasing market favor. Flexible screen smartphones refer to phones that use bendable and highly flexible screens. Compared to traditional screens, flexible screens have a significant advantage due to their flexibility. With the development of display technology, curved screens have become a major trend in the display field. The curvature of the sides of a curved screen increases the display area and improves the screen-to-body ratio, providing users with a better sensory experience. Curved screens include dual-curved screens and quad-curved screens. Dual-curved screens have two opposite sides with a certain curvature, while quad-curved screens have all four sides with a certain curvature. Quad-curved screens offer significant benefits in terms of feel and bezel size. To maximize aesthetic benefits, deeply curved quad-curved screens are increasingly favored by various terminal devices and consumers. The greater the curvature and the steeper the curvature of quad-curved screens, the more likely future products will be products with deeply curved designs.

[0003] However, as the curvature of curved screen bezels increases—meaning the bending becomes steeper and deeper—the bending radius (R value) of the curved screen bezel continuously decreases, while the bending depth (H value) continuously increases, and the bending angle (θ) also becomes larger. Quad-curved screens are typically formed by bonding a flexible display module to a curved cover plate. Under greater curvature, the rebound force of the module increases accordingly, making current conventional 3D curved screen bonding devices unable to meet the requirements of high-specification quad-curved screens. The intersection of two adjacent curved edges in a quad-curved screen forms a Gaussian angle. The rebound force of the module structure at the Gaussian angle is too great, leading to defects such as rebound bubbles (Gaussian angle bubbles) at the curved surface position after bonding. Furthermore, excessive bonding pressure can cause cracks in the film layer of the flexible display module, resulting in black spots and other defects. To solve these technical problems, improvements to the curved screen bonding device are needed. Invention Overview

[0004] This application provides a curved screen bonding device and a curved screen bonding method. By designing differentiated bonding pressures on different areas during the bonding process between the screen body and the curved cover plate, it can improve the bubble problem in the Gaussian angle area of ​​the curved screen and avoid cracks and black spots caused by excessive pressure.

[0005] In a first aspect, this application provides a curved screen bonding device for bonding a screen body and a curved cover plate. The curved screen bonding device includes a base, a pad, and a flexible mold. The base has a support surface, the pad and the flexible mold are both located on the support surface, and the flexible mold covers the pad. The side of the flexible mold away from the base has a shape that matches the curved cover plate.

[0006] The flexible mold includes a planar pressing part and a curved pressing part surrounding the planar pressing part, and the pad is provided corresponding to the planar pressing part; the curved pressing part includes a plurality of curved edge pressing parts surrounding the planar pressing part, and a curved angle pressing part located between any two adjacent curved edge pressing parts, wherein the extension directions of any two adjacent curved edge pressing parts are different;

[0007] When the screen body and the curved cover plate are attached, the pressure applied by the base to the curved corner pressing part is greater than the pressure applied by the base to the flat pressing part.

[0008] Secondly, this application provides a method for bonding a curved screen, comprising the following steps:

[0009] Fix the curved cover plate to the cover plate fixing seat;

[0010] Provide the curved screen bonding device described above, and align the curved screen bonding device with the curved cover plate;

[0011] The screen body is fixed to the side of the flexible mold facing away from the base, so that the screen body is completely fitted to the side of the flexible mold facing away from the base; and

[0012] The curved screen bonding device is moved toward the curved cover plate so that the screen body and the curved cover plate are fully bonded together; wherein, when the screen body and the curved cover plate are bonded together, the pressure applied by the base to the curved corner pressing part is greater than the pressure applied by the base to the flat pressing part. Attached Figure Description

[0013] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0014] Figure 1 is an exploded view of an exemplary four-curved screen display device provided in an embodiment of this application;

[0015] Figure 2 is an exploded view of another exemplary four-curved screen display device provided in an embodiment of this application;

[0016] Figure 3 is a top view of an exemplary screen structure provided in an embodiment of this application;

[0017] Figure 4 is an exploded structural diagram of a curved screen bonding device provided in an embodiment of this application;

[0018] Figure 5 is a schematic diagram of the combined structure of the curved screen bonding device shown in Figure 4;

[0019] Figure 6 is a schematic diagram of the cross-sectional structure at point A-A' in Figure 5;

[0020] Figure 7 is a schematic diagram of the cross-sectional structure at point B-B' in Figure 5;

[0021] Figure 8 is a schematic diagram of the cross-sectional structure at point C-C' in Figure 5;

[0022] Figure 9 is a structural schematic diagram of a base provided in an embodiment of this application;

[0023] Figure 10 is a structural schematic diagram of the main support part and the first frame support part of a base provided in an embodiment of this application;

[0024] Figure 11 is an enlarged schematic diagram of region D in Figure 10;

[0025] Figure 12 is a schematic diagram of the structure of the flexible mold in Figure 4 after it has been flipped 180°.

[0026] Figure 13 is an enlarged schematic diagram of region E in Figure 12;

[0027] Figure 14 is a force cloud diagram of the Gaussian angle region of the screen body when the curved bonding device without a pressure boosting structure in the Gaussian angle region is used to bond the screen body and the curved cover plate.

[0028] Figure 15 is a force cloud diagram of the Gaussian angle region of the screen body when the curved bonding device with a pressure boosting structure in the Gaussian angle region provided in the embodiment of this application is used to bond the screen body and the curved cover plate.

[0029] Figure 16 is a schematic flowchart of a method for bonding a curved screen according to an embodiment of this application;

[0030] Figure 17 is a schematic diagram of the alignment of the curved cover plate, screen body and curved screen bonding structure provided in the embodiment of this application;

[0031] Figure 18 is a schematic diagram of the screen body and the flexible mold side away from the base provided in the embodiment of this application when they are fully bonded.

[0032] Figure 19 is a schematic diagram of the third plane area of ​​the screen body provided in the embodiment of this application contacting the first plane area of ​​the curved cover plate;

[0033] Figure 20 is an enlarged schematic diagram of region F in Figure 19;

[0034] Figure 21 is a schematic diagram of the screen body and the curved cover plate being fully fitted together according to an embodiment of this application. Embodiments of the present invention

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0036] As shown in Figure 1, the quad-curved screen display device 1 includes a screen body 2, an optically clear adhesive (OCA) layer 3, and a curved cover plate 4. The screen body 2 and the curved cover plate 4 are bonded and fixed together by the transparent optical adhesive layer 3. As shown in Figure 2, the screen body 2 includes, from bottom to top, a buffer heat dissipation layer 5, a back plate 6, a display panel 7, and a polarizer 8. An ink layer 9 can also be disposed between the curved cover plate 4 and the optical adhesive layer 3. At the four corners of the quad-curved screen display device 1, there are horizontal and vertical curved overlapping areas. When the screen body 2 and the curved cover plate 4 are bonded into these curved overlapping areas, they are compressed. These curved overlapping areas are called Gaussian angle areas 10, and the curved surface of these areas is called a Gaussian surface. When the screen body 2 is fully inserted into the Gaussian angle area 10, the Gaussian surface of the Gaussian angle area 10 can be displayed, thereby achieving a quad-curved screen display with a high screen-to-body ratio.

[0037] However, as the edge curvature of the quad-curved screen display device 1 becomes steeper and deeper, the compression on the back plate 6 and display panel 7 in the Gaussian angle region 10 increases when the screen body 2 is bonded to the curved cover plate 4. Since the back plate 6, as the support for the display panel 7, has a high elastic modulus, it generates a large rebound force F. When this rebound force F exceeds the adhesion force of the optical adhesive layer 3 between the display panel 7 and the curved cover plate 4, the display panel 7 and the curved cover plate 4 will separate in the Gaussian angle region 10, leading to rebound bubbles (also known as Gaussian angle bubbles) on the Gaussian curved surface. Increasing the overall bonding pressure to avoid Gaussian angle bubbles will cause film layer breakage in the display panel 7. For example, the touch layer and encapsulation layer in the display panel 7 may crack due to excessive pressure, resulting in problems such as black spots on the display panel 7.

[0038] To address the aforementioned technical problems, this application provides a novel curved screen bonding device suitable for bonding fully uniform depth quad-curved screens. By using the curved screen bonding device provided in this application to bond the screen body and the curved cover plate, the Gaussian angle bubble problem can be effectively solved. Simultaneously, it can balance the bonding pressure between curved and non-curved areas, avoiding defects such as cracks and black spots caused by excessive pressure. In other words, this application can solve the problems of under-pressure bubbles and over-pressure cracks during the curved screen bonding process. Please refer to the following description of the embodiments for details.

[0039] As shown in Figures 4 and 5, this application embodiment provides a curved screen bonding device 11 for bonding the screen body 2 and the curved cover plate 4 shown in Figure 1. The curved screen bonding device 11 includes a base 12, a pad 13 and a flexible mold 14. The base 12 has a support surface 15. The pad 13 and the flexible mold 14 are both located on the support surface 15, and the flexible mold 14 covers the pad 13. The side of the flexible mold 14 away from the base 12 has a shape that matches the curved cover plate 4.

[0040] As shown in Figure 4, the flexible pressing mold 14 includes a planar pressing portion 141 and a curved pressing portion 142 surrounding the planar pressing portion 141. The pad 13 is disposed corresponding to the planar pressing portion 141. The curved pressing portion 142 includes multiple curved edge pressing portions 142a (142a') surrounding the planar pressing portion 141, and curved corner pressing portions 142b located between any two adjacent curved edge pressing portions 142a and curved edge pressing portions 142a'. The extension directions of any two adjacent curved edge pressing portions 142a and curved edge pressing portions 142a' are different. When the screen body 2 and the curved cover plate 4 are attached, the pressure applied by the base 12 to the curved corner pressing portion 142b is greater than the pressure applied by the base 12 to the planar pressing portion 141.

[0041] Understandably, the planar pressing part 141 of the flexible mold 14 is planar on the side away from the base 12, and the curved pressing part 142 is curved on the side away from the base 12.

[0042] As shown in Figures 3 and 4, the planar pressing part 141 corresponds to the middle planar region 2a of the screen body 2, the curved edge pressing part 142a (142a') corresponds to the border region 2b of the curved screen, and the curved corner pressing part 142b corresponds to the top corner region 2c of the screen body 2 (i.e., the Gaussian angle region 10 of the curved screen).

[0043] It is understandable that the top corner region 2c of screen 2 and the Gaussian angle region 10 of the curved screen are essentially the same region. The two names are used to distinguish the different states of the screen.

[0044] During the process of bonding the screen 2 and the curved cover plate 4, the base 12 drives the flexible mold 14 to move towards the curved cover plate 4. When the screen 2 and the flexible mold 14 are completely bonded (contouring) on ​​the side away from the base 12, the base 12 drives the screen 2 and the flexible mold 14 to move towards the curved cover plate 4. When the screen 2 contacts the planar area of ​​the curved cover plate 4, the base 12 continues to move towards the curved cover plate 4 and applies pressure to the flexible mold 14, so that the flexible mold 14 applies bonding pressure to the screen 2, thereby making the screen 2 gradually bond completely with the curved cover plate 4.

[0045] Specifically, during the bonding process between the screen body 2 and the curved cover plate 4, when the screen body 2 and the curved cover plate 4 are bonded, the base 12 is in a pressure state. The main support part 121 of the base 12 applies pressure to the flat pressing part 141 of the flexible mold 14, so that the flat pressing part 141 provides bonding pressure to the middle flat area 2a of the screen body 2. At the same time, the frame support part 122 of the base 12 applies pressure to the curved edge pressing part 142a (142a') of the flexible mold 14, so that the curved edge pressing part 142a (142a') applies bonding pressure to the frame area (corresponding to the curved edge area of ​​the curved screen) 2b of the screen body 2. Furthermore, the corner support part 123 of the base 12 applies pressure to the curved corner pressing part 142b of the flexible mold 14, so that the curved corner pressing part 142b applies bonding pressure to the top corner area 2c of the screen body 2. The flexible molding 14 applies bonding pressure to the screen body 2, and the curved cover plate 4 are tightly bonded together.

[0046] In this embodiment, the pressure applied by the base 12 to the curved corner pressing part 142b is greater than the pressure applied by the base 12 to the flat pressing part 141. This results in the screen body 2 experiencing a greater bonding pressure in the top corner region 2c (Gaussian angle region 10) than the middle flat region 2a when the screen body 2 and the curved cover plate 4 are bonded. This embodiment differentiates the bonding pressure between the top corner region 2c and the middle flat region 2a of the screen body 2. On one hand, this ensures that the top corner region 2c experiences sufficiently high bonding pressure during bonding, thereby increasing the bonding force between the screen body 2 and the curved cover plate 4 in the Gaussian angle region 10. This helps resist rebound force and improves the Gaussian angle bubble problem caused by rebound. On the other hand, it ensures appropriate bonding pressure in the middle flat region 2a, guaranteeing the bonding effect while avoiding problems such as cracks and black spots caused by excessive bonding pressure.

[0047] In some embodiments, when the screen body 2 and the curved cover plate 4 are bonded together, the pressure applied by the base 12 to the curved corner pressing portion 142b is greater than the pressure applied by the base 12 to the curved edge pressing portion 142a (142a'), and the pressure applied by the base 12 to the curved edge pressing portion 142a (142a') is greater than the pressure applied by the base 12 to the flat pressing portion 141. That is, when the screen body 2 and the curved cover plate 4 are bonded together, the bonding pressure on the screen body 2 in the middle flat area 2a, the border area 2b, and the top corner area 2c increases sequentially.

[0048] This application embodiment differentiates the bonding pressure of the top corner region 2c, the border region 2b, and the middle plane region 2a of the screen body 2. On the one hand, the top corner region 2c of the screen body 2 is subjected to sufficiently large bonding pressure during bonding, thereby increasing the bonding force between the screen body 2 and the curved cover plate 4 in the Gaussian angle region 10, which can resist the rebound force and improve the rebound bubble problem. On the other hand, the bonding pressure of the border region 2b and the middle plane region 2a of the screen body 2 is appropriate, which not only ensures the bonding effect between the curved edge region (border region 2b) and the middle plane region 2a, but also avoids problems such as cracks and black spots caused by excessive bonding pressure.

[0049] Of course, in other embodiments, while ensuring that no cracks appear in the screen, the bonding pressure of the curved edge region (border region 2b) can also be equal to the bonding pressure of the Gaussian corner region 10 (top corner region 2c) or the middle plane region 2a.

[0050] In some embodiments, as shown in FIG4, the flexible mold 14 further includes a transition pressing part 143 connecting the planar pressing part 141 and the curved pressing part 142. The side of the transition pressing part 143 facing away from the base 12 is also planar. It can be understood that both the planar pressing part 141 and the transition pressing part 143 are provided corresponding to the planar area of ​​the curved cover plate 4, and the transition pressing part 143 corresponds to the planar transition area 2d of the screen body 2.

[0051] In some embodiments, when the screen body 2 and the curved cover plate 4 are bonded together, the pressure applied by the base 12 to the curved edge pressing portion 142a (142a') is greater than the pressure applied by the base 12 to the transition pressing portion 143, and the pressure applied by the base 12 to the transition pressing portion 143 is greater than the pressure applied by the base 12 to the flat pressing portion 141. It is understood that when the screen body 2 and the curved cover plate 4 are bonded together, the bonding pressure of the screen body 2 in the middle flat area 2a, the flat transition area 2d, the curved edge area (border area 2b), and the Gaussian angle area 10 increases sequentially, which can optimize the bonding effect of each area and effectively solve the bubble problem in the Gaussian angle area 10 and the crack and black spot problems in other areas.

[0052] In some embodiments, as shown in Figures 9 and 10, the base 12 includes a main support portion 121, a plurality of side frame supports 122 connected to the periphery of the main support portion 121, and corner supports 123 located between any two adjacent side frame supports 122. Referring to Figures 5 to 8, the main support portion 121 is aligned with the flat pressing portion 141, the plurality of side frame supports 122 are aligned with a plurality of curved edge pressing portions 142a (142a'), and the plurality of corner supports 123 are aligned with a plurality of curved corner pressing portions 142b. The pad 13 is located on the main support portion 121. The flat pressing portion 141, on the side near the base 12 and avoiding the pad 13, contacts the main support portion 121. The curved edge pressing portion 142a (142a'), on the side near the base 12, at least partially contacts the corresponding frame support portion 122, and the curved corner pressing portion 142b, on the side near the base 12, at least partially contacts the corresponding corner support portion 123. The corner support portion 123 is provided in a protruding form relative to the main support portion 121.

[0053] In some embodiments, the frame support portion 122 is also protruding relative to the main support portion 121, and the height difference between the corner support portion 123 and the main support portion 121 is greater than the height difference between the frame support portion 122 and the main support portion 121, so that when the screen body 2 and the curved cover plate 4 are bonded, the bonding pressure on the screen body 2 in the middle plane region 2a, the frame region 2b and the top corner region 2c increases sequentially.

[0054] Understandably, both the corner support 123 and the frame support 122 are protruding relative to the main support 121. The height difference between the corner support 123 and the main support 121 is greater than the height difference between the frame support 122 and the main support 121, indicating that the heights of the corner support 123, the frame support 122, and the main support 121 decrease sequentially. When the curved corner pressing part 142b, the curved edge pressing part 142a (142a'), and the flat pressing part 141 contact the screen body 2, the pressure on the curved corner pressing part 142b, the curved edge pressing part 142a (142a'), and the flat pressing part 141 decreases sequentially due to the sequential decrease in height of the corner support 123, the frame support 122, and the main support 121, thereby achieving a pressure differentiation design for different areas.

[0055] In some embodiments, as shown in Figures 6 and 11, the corner support portion 123 is provided in a multi-layered stepped manner at least in the direction toward the main support portion 121.

[0056] In one specific embodiment, the corner support portion 123 is arranged in a multi-layered stepped shape with a progressively descending orientation at least in the direction toward the main support portion 121.

[0057] Analysis of the curvature of the Gaussian angle region of a conventional four-curved screen reveals that the curvature gradually increases from the near-planar region towards the outer edge. Since a greater curvature increases the probability of bounce bubbles, the outer edge of the Gaussian angle region of the curved screen exhibits the highest probability of bounce bubbles.

[0058] In this embodiment, the corner support portion 123 is arranged in a multi-step manner with progressively descending dimensions in the direction toward the main support portion 121. This is equivalent to setting a multi-stage pressure-boosting structure on the corner support portion 123 corresponding to the Gaussian corner region 10. This causes the bonding pressure on the four top corner regions 2c of the screen body 2 to gradually increase from the inside of the top corner toward the outer edge during bonding. This avoids the occurrence of rebound bubbles in the area with a large curvature in the Gaussian corner region 10, thereby effectively preventing rebound bubbles from occurring in the Gaussian corner region 10 of the formed curved screen.

[0059] In some embodiments, as shown in Figures 10 and 11, the corner support portion 123 includes a first sub-support portion 123a connected to the main support portion 121, a second sub-support portion 123b located on the first sub-support portion 123a, and a third sub-support portion 123c located on the second sub-support portion 123b. The third sub-support portion 123c, the second sub-support portion 123b, and the first sub-support portion 123a are arranged in a stepped manner that descends gradually in the direction toward the main support portion 121.

[0060] Understandably, the third sub-support 123c, the second sub-support 123b, and the first sub-support 123a are equivalent to three pressure boosting steps. Of course, the number of sub-supports in this embodiment is not limited to this. The number of sub-supports can be increased according to the actual situation, thereby increasing the number of pressure boosting steps, so that the fitting pressure at different positions in the Gaussian angle region 10 is more in line with the requirements.

[0061] Correspondingly, as shown in Figures 12 and 13, the curved corner pressing part 142b is provided with a first recessed part 16 and a groove part 17 on the side near the base 12. The first recessed part 16 is aligned with the second sub-support part 123b, and the groove part 17 is located in the first recessed part 16 and aligned with the third sub-support part 123c. The third sub-support part 123c is located in the groove part 17, and the side of the first recessed part 16 near the corner support part 123 is fitted with the side of the second sub-support part 123b near the third sub-support part 123c.

[0062] Understandably, the structure of the curved corner pressing part 142b near the base 12 is matched with the structure of the corresponding corner support part 123, resulting in different pressures on different positions of the curved corner pressing part 142b. Furthermore, the third sub-support part 123c being located in the groove part 17 makes the connection between the curved corner pressing part 142b and the base 12 more stable, and during the bonding process between the screen body 2 and the curved cover plate 4, the pressure on the curved corner pressing part 142b is more stable, which helps improve the bonding effect between the curved corner pressing part 142b and the screen body 2.

[0063] In some embodiments, as shown in Figures 6, 10, and 11, the corner support portion 123 further includes a first retaining wall 123d connected to the side of the second sub-support portion 123b opposite to the main support portion 121, and the distance between the first retaining wall 123d and the third sub-support portion 123c is greater than 0. The edge portion of the curved corner pressing portion 142b near the base 12 is located between the first retaining wall 123d and the third sub-support portion 123c. The distance between the bottom of the groove portion 17 and the third sub-support portion 123c is greater than 0, resulting in a gap between the corner support portion 123 and the corresponding curved corner pressing portion 142b.

[0064] Understandably, due to the multi-stage pressure-increasing structure designed in the corner support portion 123, the high rebound force of the Gaussian angle region 10 can be resisted by applying greater pressure, thereby achieving bubble-free bonding. Furthermore, this embodiment of the application also provides a gap between the corner support portion 123 and the corresponding curved corner pressing portion 142b for pressure relief, thereby preventing excessive pressure from causing cracks and black spots on the screen body 2. In addition, the first baffle 123d can also limit the curved corner pressing portion 142b, allowing it to make more full contact and fit with the screen body 2 during the bonding process, thus improving the bonding yield and preventing bubble formation.

[0065] In some embodiments, as shown in FIG6, the transition pressing part 143 includes a first transition pressing part 143a connected to the curved corner pressing part 142b. The first transition pressing part 143a is aligned with the first sub-support part 123a, and the distance between the first transition pressing part 143a and the first sub-support part 123a is greater than 0. This design ensures that there is also a gap between the first sub-support part 123a and the corresponding first transition pressing part 143a, which can also avoid problems such as cracks and black spots on the screen 2 caused by excessive pressure.

[0066] In some embodiments, as shown in Figures 10 and 11, the edge of the curved angle pressing portion 142b away from the flat pressing portion 141 is arc-shaped, and any one of the second sub-support portion 123b, the third sub-support portion 123c, the groove portion 17, and the first recessed portion 16 extends along the extending direction of the edge of the curved angle pressing portion 142b. This design makes the force more uniform at locations with the same bending radius in the Gaussian angle region 10, which is beneficial for further improving the bubble problem.

[0067] In some embodiments, as shown in FIG11, the third sub-support portion 123c includes a plurality of sub-protrusions 18 arranged sequentially along the extending direction of the edge of the curved corner pressing portion 142b, and the groove portion 17 includes sub-grooves 19 arranged in a one-to-one correspondence with the plurality of sub-protrusions 18, with the sub-protrusions 18 located in the corresponding sub-grooves 19. This design increases the contact area between the curved corner pressing portion 142b and the third sub-support portion 123c, which is beneficial to improving the uniformity of force on the curved corner pressing portion 142b, thereby improving the uniformity of adhesion in the Gaussian angle region 10 and avoiding the generation of air bubbles.

[0068] Of course, in other embodiments, the third sub-support 123c can also be an integral structure.

[0069] In some embodiments, as shown in Figures 11 and 13, the second sub-support 123b includes a first sidewall 20 near the main support 121 and connected to the top of the first sub-support 123a, and the first recessed portion 16 includes a second sidewall 21 matching the first sidewall. The slope angles of the first sidewall 20 and the second sidewall 21 are both greater than 0° and less than 90°. That is, the first sidewall 20 and the second sidewall 21 are sloped. This design allows the corner support 123 to exert an upward pressure on the curved corner pressing portion 142b during the bonding process between the screen body 2 and the curved cover plate 4, resulting in more complete contact and bonding between the curved corner pressing portion 142b and the screen body 2, thereby preventing air bubbles from forming.

[0070] In some embodiments, as shown in FIG4, the plurality of frame support portions 122 include a pair of first frame support portions 1221 and a pair of second frame support portions 1222 disposed opposite to each other. The first frame support portions 1221 extend along a first direction X, and the second frame support portions 1222 extend along a second direction Y, with the first direction X and the second direction Y being perpendicular to each other. Each end of each first frame support portion 1221 is respectively disposed adjacent to two second frame support portions 1222, and a corner support portion 123 is provided between adjacent first frame support portions 1221 and second frame support portions 1222. The pair of first frame support portions 1221 are fixedly connected to the opposite sides of the main support portion 121 in the second direction Y, and the pair of second frame support portions 1222 are detachably connected to the opposite sides of the main support portion 121 in the first direction X. The detachable connection between the second frame support portions 1222 and the main support portion 121 makes the installation and removal of the pad 13 and the flexible mold 14 more convenient.

[0071] In some embodiments, the first direction X is the long side direction of the base 12, corresponding to the long side direction of the screen 2, and the second direction Y is the short side direction of the base 12, corresponding to the short side direction of the screen 2.

[0072] In some embodiments, as shown in Figures 9 and 10, the first frame support portion 1221 includes a first frame main body portion 1221a and a first frame protrusion portion 1221b extending along a first direction X. The first frame protrusion portion 1221b is located on the first frame main body portion 1221a and disposed close to the frame. Both ends of the first frame main body portion 1221a are respectively connected to two adjacent first sub-support portions 123a, and the height difference between the first frame main body portion 1221a and the first sub-support portions 123a relative to the main support portion 121 is the same. Both ends of the first frame protrusion portion 1221b are respectively connected to the ends of two adjacent second sub-support portions 123b, and the height difference between the first frame protrusion portion 1221b and the main support portion 121 is less than the height difference between the second sub-support portions 123b and the main support portion 121. The first frame protrusion 1221b and the first frame main body 1221a are stepped in the direction toward the main support 121, and the top of the first frame protrusion 1221b is fitted to the side of the corresponding curved edge pressing part 142a near the base 12.

[0073] The height difference between the first frame protrusion 1221b and the main support 121 is less than the height difference between the second sub-support 123b and the main support 121, so that the third sub-support 123c, the second sub-support 123b and the first frame protrusion 1221b form a three-stage pressure boosting structure in the first direction X, and the third sub-support 123c, the second sub-support 123b, the first frame protrusion 1221b and the first frame main body 1221a form a four-stage pressure boosting structure. This achieves a differentiated design of the bonding pressure in the Gaussian angle region 10, the curved edge region and the planar region, which can more effectively avoid the generation of bonding bubbles, and can also avoid the generation of rebound bubbles in the Gaussian angle region 10.

[0074] In some embodiments, as shown in Figures 7 and 11, the first frame support portion 1221 further includes a second retaining wall 1221c connected to the first frame main body portion 1221a and located on the side of the first frame protrusion 1221b facing away from the main support portion 121. A groove portion 22 is formed between the second retaining wall 1221c and the adjacent second sub-support portion 123b and the first frame protrusion 1221b, and the groove portion 22 extends along the first direction X. As shown in Figures 7 and 12, the curved edge pressing portion 142a is provided with a first flexible protrusion 23 located in the groove portion 22 on the side near the base 12. The groove portion 22 includes a third sidewall 24 on the side near the first frame protrusion 1221b, and the first flexible protrusion 23 includes a fourth sidewall 25 that matches the first sidewall 20. The slope angles of the third sidewall 24 and the fourth sidewall 25 are both greater than 0° and less than 90°.

[0075] Understandably, the second retaining wall 1221c can limit the curved edge pressing part 142a, allowing the curved edge pressing part 142a to fit more fully against the screen body 2 during the bonding process, which helps improve the bonding yield and avoids air bubbles. Furthermore, the third sidewall 24 and the fourth sidewall 25 are sloped. This design allows the first frame support part 1221 to exert an upward pressure on the curved edge pressing part 142a during the bonding process, ensuring more complete contact and bonding between the curved edge pressing part 142a and the screen body 2, thereby preventing air bubbles.

[0076] In some embodiments, adjacent first retaining walls 123d and second retaining walls 1221c are connected to each other and can be integrally formed.

[0077] In some embodiments, as shown in FIG7, the transition pressing portion 143 further includes a second transition pressing portion 143b connected to the curved edge pressing portion 142a extending along the first direction X. The second transition pressing portion 143b is aligned with the first frame body portion 1221a, and the distance between the second transition pressing portion 143b and the first frame body portion 1221a is greater than 0. This design ensures that there is also a gap between the first frame body portion 1221a and the corresponding second transition pressing portion 143b, which can also prevent excessive pressure from causing cracks and black spots on the screen 2.

[0078] In some embodiments, as shown in Figures 4, 8, and 10, the main support portion 121 has openings 26 on opposite sides in the first direction X, and the second frame support portion 1222 includes a connecting portion 1222a, a second frame main body portion 1222b, and a second frame protrusion portion 1222c. The connecting portion 1222a is located in the openings 26 and is detachably connected to the main support portion 121. The second frame main body portion 1222b is located on the connecting portion 1222a, and the second frame protrusion portion 1222c is located on the second frame main body portion 1222b, and the second frame main body portion 1222b and the second frame protrusion portion 1222c extend along the second direction Y.

[0079] The two ends of the second frame main body 1222b are respectively connected to two adjacent first sub-supports 123a, and the height difference between the second frame main body 1222b and the main support 121 is less than or equal to the height difference between the second sub-support 123b and the main support 121. The two ends of the second frame protrusion 1222c are respectively connected to two adjacent second sub-supports 123b, and the height difference between the second frame protrusion 1222c and the main support 121 is less than the height difference between the second sub-support 123b and the main support 121. The second frame protrusion 1222c and the second frame main body 1222b are stepped in the direction toward the main support 121.

[0080] Understandably, the height difference between the second frame protrusion 1222c and the main support 121 is less than the height difference between the second sub-support 123b and the main support 121, which makes the third sub-support 123c, the second sub-support 123b and the second frame protrusion 1222c form a three-stage pressure boosting structure in the second direction Y, and makes the third sub-support 123c, the second sub-support 123b, the second frame protrusion 1222c and the second frame main body 1222b form a four-stage pressure boosting structure. This realizes the differentiated design of the bonding pressure of the Gaussian angle region 10, the curved edge region (frame region 2b) and the middle plane region 2a, which can more effectively avoid the generation of bonding bubbles, and also avoid the generation of rebound bubbles in the Gaussian angle region 10.

[0081] The second frame support portion 1222 also includes a third retaining wall 1222d located on the side of the second frame protrusion 1222c away from the main support portion 121. The curved edge pressing portion 142a' corresponding to the second frame protrusion 1222c is located on the side of the third retaining wall 1222d close to the main support portion 121, and is fitted to the top of the second frame protrusion 1222c.

[0082] Understandably, the third barrier 1222d can limit the curved edge pressing part 142a', so that during the bonding process of the screen body 2 and the curved cover plate 4, the curved edge pressing part 142a' can fit more fully with the screen body 2, which is conducive to improving the bonding yield and avoiding the generation of air bubbles.

[0083] As shown in Figure 12, the curved edge pressing part 142a' in this embodiment has a different structure from the curved edge pressing part 142a because the second frame support part 1222 has a different structure from the first frame support part 1221. Of course, in other embodiments, if the second frame support part 1222 has the same structure as the first frame support part 1221, then the curved edge pressing part 142a' has the same structure as the curved edge pressing part 142a.

[0084] In some embodiments, as shown in FIG9, the two ends of the third retaining wall 1222d correspond to and are adjacent to the ends of the adjacent first retaining wall 123d, so that the first retaining wall 123d, the second retaining wall 1221c and the third retaining wall 1222d form a continuous retaining wall structure.

[0085] As shown in Figure 8, the transition pressing part 143 further includes a third transition pressing part 143c connected to the curved edge pressing part 142a' extending along the second direction Y. The third transition pressing part 143c is aligned with the second frame body part 1222b, and the gap between the third transition pressing part 143c and the second frame body part 1222b is greater than 0. This design ensures that there is also a gap between the second frame body part 1222b and the corresponding third transition pressing part 143c, which can also prevent excessive pressure from causing cracks and black spots on the screen 2.

[0086] Understandably, the first transition pressing part 143a, the second transition pressing part 143b and the third transition pressing part 143c are connected in sequence to form a transition pressing part 143 surrounding the planar pressing part 141.

[0087] In some embodiments, since the first sub-support 123a, the first frame main body 1221a, and the second frame main body 1222b are connected in sequence, and the first transition pressing part 143a, the second transition pressing part 143b, and the third transition pressing part 143c are connected in sequence, a continuous gap space is provided between the entire transition pressing part 143 and the base 12. This design can solve the problem of door frame marks being generated in the planar transition area 2d between the curved edge area (frame area 2b) and the middle planar area 2a when the screen 2 is bonded to the curved cover plate 4, thereby helping to improve problems such as poor optical reflection appearance caused by uneven thickness of the optical adhesive layer 3.

[0088] In some embodiments, as shown in FIG12, the side of the transition pressing portion 143 near the base 12 is also planar, but not limited thereto.

[0089] In some embodiments, as shown in FIG8, the second frame main body portion 1222b extends toward the main support portion 121 and covers part of the pad 13; the distance between the second frame main body portion 1222b and the flat pressing portion 141 is greater than 0. Extending the second frame main body portion 1222b toward the main support portion 121 can, on the one hand, protect and limit the pad 13, and on the other hand, further increase the pressure relief space to avoid excessive pressure causing cracks and black spots on the screen 2.

[0090] In some embodiments, as shown in Figures 4 and 5, threaded holes are provided on the sidewalls of both the connecting part 1222a and the main support part 121, and the two can be detachably and fixedly connected by screws or bolts.

[0091] In some embodiments, as shown in FIG7, the pad 13 is fitted against the side of the main support portion 121 near the flat pressing portion 141, and the gap between the flat pressing portion 141 and the side of the pad 13 opposite to the base 12 is greater than 0. This arrangement allows the main support portion 121 to provide more uniform pressure on the flat pressing portion 141, ensuring that the planar area of ​​the screen 2 is subjected to more uniform bonding pressure. At the same time, the gap between the flat pressing portion 141 and the pad 13 can prevent excessive pressure from causing problems such as cracks and black spots on the screen 2.

[0092] In some embodiments, as shown in Figures 5, 7, and 12, the planar pressing portion 141 has a second flexible protrusion 28 on the side near the base 12. The side of the second flexible protrusion 28 near the base 12 covers the pad 13 in the second direction Y. The distance between the second flexible protrusion 28 and the side of the pad 13 facing away from the base 12 is greater than 0, and the distance between the two opposite sides of the second flexible protrusion 28 and the pad 13 in the second direction Y is greater than 0. The main support portion 121 includes a second recessed portion 29 disposed near each first frame support portion 1221. The side of the second flexible protrusion 28 near the base 12 is fitted with the bottom of the corresponding second recessed portion 29. The side of the second flexible protrusion 28 near the base 12 covers the pad 13 in the second direction Y and is fitted with the bottom of the corresponding second recessed portion 29, making the connection between the second flexible protrusion 28 and the main support portion 121 more stable and improving the fitting effect. Furthermore, the distance between the second flexible protrusion 28 and the top and side of the pad 13 is greater than 0, providing sufficient pressure relief space for the flat pressing area, which can avoid excessive pressure causing cracks and black spots on the screen 2.

[0093] Understandably, the second flexible protrusion 28 has a groove structure 30 for accommodating the pad 13 on the side near the base 12, and the transition pressing part 143 is arranged around the second flexible protrusion 28.

[0094] In some embodiments, the pad 13 extends to the second recessed portion 29 of the shielding portion, and the second flexible protrusion 28 is also located between the bottom of the pad 13 and the second recessed portion 29, and the distance between the second flexible protrusion 28 and the sidewall of the second recessed portion 29 away from the adjacent first frame support portion 1221 is greater than 0. This design further improves the covering stability of the second flexible protrusion 28, which is beneficial to improving the bonding effect, and further increases the pressure relief space, which can avoid problems such as cracks and black spots on the screen body 2 caused by excessive pressure.

[0095] In some embodiments, as shown in Figures 2 and 12, the screen body 2 is provided with a light-receiving area 31, and the flat pressing part 141 includes a first flat pressing area 32 and a second flat pressing area 33 arranged adjacent to each other. When the screen body 2 and the curved cover plate 4 are attached, the first flat pressing area 32 and the light-receiving area 31 are aligned, and the pressure applied by the base 12 to the second flat pressing area 33 is greater than the pressure applied by the base 12 to the first flat pressing area 32.

[0096] It is understandable that, since the light-receiving area 31 of the screen body 2 is a cut area (O-cut area), some film layers have cut holes corresponding to the light-receiving area 31, which makes the film layer structure near the light-receiving area 31 prone to cracking. By reducing the bonding pressure of the light-receiving area 31, cracks in the film layer at the edge of the light-receiving area 31 of the screen body 2 can be avoided.

[0097] In some embodiments, the flat pressing part 141 or the base 12 is provided with a pressure relief groove on the side near the pad 13. The pressure relief groove and the first flat pressing area 32 are arranged to coincide in a direction perpendicular to the pad 13. The distance between the bottom of the pressure relief groove and the pad 13 is greater than 0.

[0098] In other embodiments, the pad 13 is provided with a pressure relief groove on the side near the flat pressing part 141. The pressure relief groove and the first flat pressing area 32 are arranged to coincide in a direction perpendicular to the pad 13. The distance between the bottom of the pressure relief groove and the flat pressing part 141 is greater than 0.

[0099] As shown in Figure 12, this embodiment of the application takes the pressure relief groove 34 being located on the side of the flat pressing part 141 near the pad 13 as an example, but it is not limited to this.

[0100] Understandably, by providing a pressure relief groove 34 on the flat pressing part 141, base 12, or pad 13 of the corresponding light-receiving area 31, excessive bonding pressure can be avoided, thereby preventing cracks in the film layer at the edge of the light-receiving area 31 of the screen body 2.

[0101] In some embodiments, as shown in FIG17, the curved cover plate 4 includes a first planar region 35 and a first curved region 36 connected to each other, with the first curved region 36 surrounding the first planar region 35. The flexible mold 14, on the side opposite to the base 12, includes a second planar region 37 and a second curved region 38 connected to each other, with the second curved region 38 surrounding the second planar region 37. The first planar region 35 and the second planar region 37 have the same shape, and the area of ​​the first planar region 35 is larger than the area of ​​the second planar region 37.

[0102] Understandably, during the process of bonding the screen body 2 and the curved cover plate 4, when the flat pressing part 141 is aligned with the screen body 2 and the curved cover plate 4, the first flat area 35 and the second flat area 37 are arranged parallel to each other and their central axes L coincide. In the direction perpendicular to the flat pressing part 141, the projection of the first flat area 35 completely covers the projection of the second flat area 37, and the distance between the projection edge of the first flat area 35 and the projection edge of the second flat area 37 is greater than 0.

[0103] In some embodiments, during the bonding process of the screen body 2 and the curved cover plate 4, as shown in FIG18, the screen body 2 is first fully bonded to the side of the flexible mold 14 opposite to the base 12, so that the border area and Gaussian angle area of ​​the screen body 2 are both curved; then, as shown in FIG19, the screen body 2 is moved to bond with the first flat area 35 of the curved cover plate 4; finally, as shown in FIG21, the screen body 2 is moved to bond with the first curved area 36 of the curved cover plate 4. When the screen body 2 is moved to bond with the first flat area 35 of the curved cover plate 4, the distance between the first curved area 36 of the curved cover plate 4 and the curved area of ​​the screen body 2 is greater than 0.

[0104] Understandably, the flexible mold 14 in this embodiment is designed to be recessed relative to the curved cover plate 4. Any point on the first planar area 35 that connects to the first curved area 36 is designated as the first arc-starting point P, and any point on the second planar area 37 that connects to the second curved area 38 is designated as the second arc-starting point Q. On the same cross-section of the curved cover plate 4 and the flexible mold 14, the first arc-starting point P and the second arc-starting point Q are located on the same plane, and the distance between the first arc-starting point P and the central axis L is greater than the distance between the second arc-starting point Q and the central axis L. In other words, this embodiment at least recesses the planar area of ​​the flexible mold 14 on the side facing away from the base 12, making the arc-starting point of the flexible mold 14 on the side facing away from the base 12 closer to the central axis L than the arc-starting point of the curved cover plate 4. Simultaneously, when the screen 2 is moved to fit against the first planar area 35 of the curved cover plate 4, the distance between the edge of the curved cover plate 4 and the curved area of ​​the screen 2 is greater than 0. This inward-sloping design prevents the edge area of ​​the screen 2 from prematurely contacting the curved part of the curved cover plate 4 during the bonding process, thereby avoiding the generation of bonding bubbles and improving the bonding yield.

[0105] In some embodiments, when the curved cover plate 4, the screen body 2 and the flexible mold 14 are aligned in the vertical direction and the first planar area 35 of the flexible mold 14 is in contact with the screen body 2, on the same cross-section of the curved cover plate 4 and the flexible mold 14, the distance h1 between the first arc starting point P and the second arc starting point Q in the horizontal direction is greater than or equal to 0.1 mm and less than or equal to 1 mm.

[0106] In some embodiments, when the screen body 2 is moved to fit against the first plane area 35 of the curved cover plate 4, the distance h2 between the edge of the curved cover plate 4 near the flexible mold 14 and the side of the screen body 2 away from the flexible mold 14 in a direction parallel to the first plane area 35 is greater than or equal to 0.5 mm and less than or equal to 5 mm.

[0107] In some embodiments, the material of the flexible mold 14 includes silicone, but is not limited thereto.

[0108] In some embodiments, the pad 13 is a pressure equalizing plate, that is, the pressure on each position on the pad 13 is uniform, and the material of the pad 13 includes acrylic, but is not limited thereto.

[0109] In some embodiments, the base 12 may be made of acrylic, aluminum or steel, but is not limited thereto.

[0110] In some embodiments, the base 12, the pad 13, and the flexible mold 14 are transparent, but not limited thereto.

[0111] This application embodiment uses a curved surface bonding device without a pressure-increasing structure in the Gaussian angle region and a curved surface bonding device with a pressure-increasing structure in the Gaussian angle region provided in this application embodiment to bond the same screen body and curved cover plate respectively. During the bonding process, the force analysis of the Gaussian angle region of the two screen bodies was performed, and the force cloud diagrams shown in Figure 14 and Figure 15 were obtained respectively. As shown in Figure 14, the contact pressures represented by f1, f2 and f3 decrease sequentially; as shown in Figure 15, the contact pressure represented by f1' is greater than the contact pressure represented by f2'.

[0112] As shown in Figure 14, when using a curved surface bonding device without a pressure boosting structure in the Gaussian angle region for bonding, the pressure on the Gaussian angle region of the screen is uneven, and the area with contact pressure f3 in Gaussian angle region 10 is relatively large, indicating that the pressure at this location is low and covers a large area, making it prone to air bubbles. As shown in Figure 15, when using the curved surface bonding device with a pressure boosting structure in the Gaussian angle region provided in this embodiment for bonding, the pressure on the Gaussian angle region of the screen is more uniform, and the area with contact pressure less than f2' (or contact pressure f3) in the Gaussian angle region is smaller, resulting in a lower risk of air bubbles. This demonstrates that the embodiment of this application can effectively improve the air bubble problem in the Gaussian angle region by setting a multi-stage pressure boosting structure in the Gaussian angle region.

[0113] In this embodiment, firstly, by designing a multi-stage pressure-increasing structure on the base 12, differentiated bonding pressure is achieved for the Gaussian angle region 10, the curved edge region, and the intermediate plane region 2a. On one hand, this ensures that the screen 2 experiences sufficiently high bonding pressure when bonding in the Gaussian angle region 10, thereby increasing the bonding force between the screen 2 and the curved cover plate 4 in the Gaussian angle region 10, resisting rebound force, and thus improving the rebound bubble problem. On the other hand, it ensures appropriate bonding pressure in the curved edge region and the intermediate plane region 2a, guaranteeing the bonding effect of the curved edge region and the intermediate plane region 2a, and avoiding cracks and black spots caused by excessive bonding pressure. Secondly, by setting multiple gaps for pressure relief between the base 12 and the flexible mold 14, problems such as cracks and black spots on the screen 2 caused by excessive pressure can be effectively avoided. Furthermore, by designing an inward-sloping surface of the flexible mold 14 (the surface on the side facing away from the base 12), the problem of bubble defects caused by premature contact of the curved part of the screen 2 can be effectively avoided.

[0114] Therefore, by improving the structure of the curved screen bonding device 11 in this application embodiment, the Gaussian angle bubble problem of the curved screen can be effectively improved, and the screen body 2 can be prevented from cracking and black spots due to excessive pressure during the bonding process, thus effectively improving the bonding yield of the four-curved screen.

[0115] As shown in Figure 16, this application embodiment also provides a method for bonding a curved screen, including steps S1701 to S1704.

[0116] S1701: Fix the curved cover plate to the cover plate fixing seat.

[0117] It is understandable that the surface of the curved cover plate to be bonded is set away from the cover plate fixing seat, and the structure of the cover plate fixing seat is not limited in the embodiments of this application.

[0118] S1702: Provides a curved screen bonding device and aligns the curved screen bonding device with the curved cover plate.

[0119] As shown in Figure 17, this embodiment of the application uses the curved screen bonding device 11 provided in the foregoing embodiment to bond the screen body 2 and the curved cover plate 4. The structure of the curved screen bonding device 11 can be referred to the description of the foregoing embodiment, and will not be repeated here.

[0120] Understandably, when the curved screen bonding device 11 and the curved cover plate 4 are aligned, the center of the side of the flexible mold 14 away from the base 12 is aligned with the center of the planar area of ​​the curved cover plate 4.

[0121] S1703: Fix the screen body to the side of the flexible mold away from the base so that the screen body is completely fitted to the side of the flexible mold away from the base.

[0122] Step S1703 includes the following steps:

[0123] As shown in Figure 17, the screen body 2 is attached to the carrier tape 39, and the opposite ends of the carrier tape 39 are clamped by the clamping assembly 40, so that the carrier tape 39 is in a taut state; the screen body 2 is located on the side of the carrier tape 39 facing the curved cover plate 4, and the curved screen bonding device 11 is located on the side of the carrier tape 39 away from the screen body 2, and the curved screen bonding device 11, the screen body 2 and the curved cover plate 4 are in an aligned state;

[0124] The curved screen bonding device 11 is moved toward the curved cover plate 4, so that the flexible mold 14 and the carrier belt 39 approach each other until the flexible mold 14 contacts the screen body 2; and

[0125] As shown in Figure 18, the curved screen bonding device 11 continues to move towards the curved cover plate 4, so that the screen body 2 on the carrier belt 39 conforms to the side of the flexible mold 14 away from the base 12, that is, the screen body 2 is completely bonded to the side of the flexible mold 14 away from the base 12, where the flat pressing part 141 and the curved pressing part 142 are set.

[0126] Understandably, the planar pressing part 141 of the flexible mold 14 is provided corresponding to the second planar area 37, and the curved pressing part 142 of the flexible mold 14 is provided corresponding to the second curved area 38.

[0127] S1704: Move the curved screen bonding device toward the curved cover plate so that the screen body and the curved cover plate are fully bonded; wherein, when the screen body and the curved cover plate are fully bonded, the pressure applied by the base to the curved corner pressing part is greater than the pressure applied by the base to the flat pressing part.

[0128] In some embodiments, as shown in Figures 17 and 19, the curved cover plate 4 includes a first planar region 35 and a first curved region 36 connected to each other near the side of the screen body 2, with the first curved region 36 surrounding the first planar region 35. The flexible mold 14, on the side opposite to the base 12, includes a second planar region 37 and a second curved region 38 connected to each other, with the second curved region 38 surrounding the second planar region 37. The first planar region 35 and the second planar region 37 have the same shape, and the area of ​​the first planar region 35 is larger than the area of ​​the second planar region 37.

[0129] As shown in Figure 18, when the screen 2 is fully fitted to the side of the flexible mold 14 facing away from the base 12, the side of the screen 2 facing away from the flexible mold 14 has a third planar area 41 and a third curved surface area 42 that are connected to each other. The third planar area 41 is set corresponding to the second planar area 37, and the third curved surface area 42 is set corresponding to the second curved surface area 38. The third planar area 41 and the first planar area 35 have the same shape, and the area of ​​the first planar area 35 is larger than the area of ​​the third planar area 41.

[0130] In some embodiments, step S1704 includes the following steps:

[0131] The curved screen bonding device 11 is moved toward the curved cover plate 4 so that the third plane area 41 of the screen body 2 contacts the first plane area 35 of the curved cover plate 4; as shown in Figure 19, the first plane area 35 completely covers the third plane area 41, the distance between the edge of the first plane area 35 and the edge of the third plane area 41 is greater than 0, and the distance between the first curved area 36 and the third curved area 42 is greater than 0; and

[0132] As shown in Figure 21, the curved screen bonding device 11 continues to move toward the curved cover plate 4 so that the third curved area 42 of the screen body 2 comes into contact with the first curved area 36 of the curved cover plate 4 until they are fully bonded.

[0133] In some embodiments, as shown in FIG20, when the curved screen bonding device 11 is moved toward the curved cover plate 4 so that the third plane area 41 of the screen body 2 contacts the first plane area 35 of the curved cover plate 4, the distance h1 between the edge of the first plane area 35 and the edge of the third plane area 41 is greater than or equal to 0.1 mm and less than or equal to 1 mm, and the distance h2 between the edge of the first curved area 36 away from the first plane area 35 and the third curved area 42 of the screen body 2 in a direction parallel to the first plane area 35 is greater than or equal to 0.5 mm and less than or equal to 5 mm.

[0134] The embodiments of this application have the following beneficial effects:

[0135] On the one hand, by designing a multi-stage pressurization structure on the base 12, the bonding pressure of the Gaussian angle region 10, the curved edge region, and the middle plane region 2a is differentiated. This allows the screen 2 to be subjected to sufficiently high bonding pressure when bonding in the Gaussian angle region 10, thereby increasing the bonding force between the screen 2 and the curved cover plate 4 in the Gaussian angle region 10, which can resist rebound force and thus improve the problem of rebound bubbles. At the same time, the bonding pressure of the curved edge region and the middle plane region 2a is appropriate, which not only ensures the bonding effect of the curved edge region and the middle plane region 2a, but also avoids cracks and black spots caused by excessive bonding pressure. Furthermore, by setting multiple gaps for pressure relief between the base 12 and the flexible mold 14, the problem of cracks and black spots on the screen 2 caused by excessive pressure can be effectively avoided.

[0136] On the other hand, the flexible mold 14 is designed to be recessed relative to the curved cover plate 4, so that the distance between the starting point of the flexible mold 14 on the side away from the base 12 and the center position of the side of the flexible mold 14 away from the base 12 is smaller than the distance between the starting point of the curved cover plate 4 and the center position of the curved cover plate 4. At the same time, when the screen 2 is moved to the point where the third plane area 41 of the screen 2 is fitted with the first plane area 35 of the curved cover plate 4, the distance between the edge of the curved cover plate 4 and the third curved area 42 of the screen 2 is greater than 0. This recessed design prevents the edge area of ​​the screen 2 from prematurely contacting the curved part of the curved cover plate 4 during the bonding process, thereby avoiding the generation of bonding bubbles and improving the bonding yield.

[0137] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0138] In the above embodiments, the descriptions of each embodiment have their own emphasis. Parts not described in detail in a particular embodiment can be referred to in the relevant descriptions of other embodiments. The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0139] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A curved screen adhering device for adhering a screen body and a curved cover plate, comprising a base, a backing plate and a flexible mold, the base has a supporting surface, the backing plate and the flexible mold are located on the supporting surface, and the flexible mold covers the backing plate; a side of the flexible mold away from the base has a shape matching the curved cover plate; the flexible mold comprises a planar pressing part and a curved pressing part arranged around the planar pressing part, the backing plate is arranged corresponding to the planar pressing part; the curved pressing part comprises a plurality of curved edge pressing parts arranged around the planar pressing part, and a curved corner pressing part located between any two adjacent curved edge pressing parts, the extension directions of any two adjacent curved edge pressing parts are different; wherein when the screen body and the curved cover plate are adhered, the base applies a greater pressure to the curved corner pressing part than to the planar pressing part. 2.The curved screen pasting device according to claim 1, wherein the base comprises a main body supporting part, a plurality of frame supporting parts connected to the periphery of the main body supporting part, and a corner supporting part located between any two adjacent frame supporting parts, the main body supporting part is arranged in position with the planar pressing part, the plurality of frame supporting parts are arranged in position one by one with the plurality of curved edge pressing parts, and the plurality of corner supporting parts are arranged in position one by one with the plurality of curved corner pressing parts; the backing plate is located on the main body supporting part, a side of the planar pressing part close to the base and avoiding the backing plate is in contact with the main body supporting part, at least part of a side of the curved edge pressing part close to the base is in contact with the corresponding frame supporting part, and at least part of a side of the curved corner pressing part close to the base is in contact with the corresponding corner supporting part; the corner supporting part is arranged in a convex shape relative to the main body supporting part.

3. The curved screen pasting device of claim 2, wherein, the pressure applied by the base to the curved corner pressing part is greater than the pressure applied by the base to the curved edge pressing part, and the pressure applied by the base to the curved edge pressing part is greater than the pressure applied by the base to the planar pressing part; the frame supporting part is arranged in a convex shape relative to the main body supporting part, and the height difference between the corner supporting part and the main body supporting part is greater than the height difference between the frame supporting part and the main body supporting part.

4. The curved screen pasting device according to claim 2 or 3, wherein, the corner supporting part is arranged in a multi-step shape at least in the direction towards the main body supporting part.

5. The curved screen pasting device of claim 4, wherein, the corner supporting part comprises a first sub-supporting part connected to the main body supporting part, a second sub-supporting part located on the first sub-supporting part, and a third sub-supporting part located on the second sub-supporting part; the third sub-supporting part, the second sub-supporting part and the first sub-supporting part are arranged in a stepped shape descending in the direction towards the main body supporting part; The curved corner pressing part is provided with a first sunken part and a groove part near one side of the base, the first sunken part is arranged in position with the second sub supporting part, and the groove part is arranged in position with the third sub supporting part in the first sunken part; the third sub supporting part is located in the groove part, and one side of the first sunken part near the corner supporting part is arranged in close contact with one side of the second sub supporting part near the third sub supporting part.

6. The curved screen pasting device of claim 5, wherein, The corner supporting part further comprises a first retaining wall connected with one side of the second sub supporting part away from the main body supporting part, and the spacing between the first retaining wall and the third sub supporting part is greater than 0; the edge part of one side of the curved corner pressing part near the base is located between the first retaining wall and the third sub supporting part; the spacing between the bottom of the groove part and the third sub supporting part is greater than 0; The flexible pressing mold further comprises a first transition pressing part connecting the curved corner pressing part and the flat pressing part, the first transition pressing part is arranged in position with the first sub supporting part, and the spacing between the first transition pressing part and the first sub supporting part is greater than 0.

7. The curved screen pasting device of claim 5, wherein, The edge of one side of the curved corner pressing part away from the flat pressing part is arranged in an arc shape, any one of the second sub supporting part, the third sub supporting part, the groove part and the first sunken part extends along the extension direction of the edge of the curved corner pressing part; The third sub supporting part comprises a plurality of sub convex parts arranged in sequence along the extension direction of the edge of the curved corner pressing part, the groove part comprises a plurality of sub groove parts arranged in one-to-one correspondence with the plurality of sub convex parts, and the sub convex part is located in the corresponding sub groove part. 8.The curved screen pasting device according to claim 5, wherein The plurality of frame supporting parts comprises a pair of first frame supporting parts arranged oppositely and a pair of second frame supporting parts arranged oppositely; the first frame supporting part extends along a first direction, the second frame supporting part extends along a second direction, and the first direction and the second direction are arranged perpendicularly; both ends of each first frame supporting part are arranged adjacent to two second frame supporting parts respectively, and one corner supporting part is arranged between the adjacent first frame supporting part and second frame supporting part; A pair of first frame supporting parts are fixedly connected with the opposite sides of the main body supporting part in the second direction, and a pair of second frame supporting parts are detachably connected with the opposite sides of the main body supporting part in the first direction.

9. The curved screen pasting device of claim 8, wherein, The first frame supporting part comprises a first frame main body part extending along the first direction and a first frame convex part, and the first frame convex part is located on the first frame main body part and is arranged away from the main body supporting part; Both ends of the first frame main body part are connected with two adjacent first sub supporting parts respectively, and the height difference between the first frame main body part and the first sub supporting part relative to the main body supporting part is the same; both ends of the first frame convex part are connected with the end parts of two adjacent second sub supporting parts respectively, and the height difference between the first frame convex part and the main body supporting part is less than the height difference between the second sub supporting part and the main body supporting part; The first frame protruding part and the first frame main part are arranged in steps in the direction towards the main body supporting part, the third sub-supporting part, the second sub-supporting part and the first frame protruding part are arranged in steps in the first direction, and the top of the first frame protruding part is arranged in close contact with the corresponding curved side pressing part on the side close to the base. 10.The curved screen pasting device according to claim 9, wherein The first frame supporting part further comprises a second retaining wall connected with the first frame main part and located on the side of the first frame protruding part away from the main body supporting part, and a groove part is formed between the second retaining wall and the adjacent second sub-supporting part and first frame protruding part, and the groove part extends along the first direction; The curved side pressing part on the side close to the base is provided with a first flexible protruding part located in the groove part; the flexible pressing die further comprises a second transition pressing part connecting the curved side pressing part and the planar pressing part extending along the first direction, the second transition pressing part is arranged in position with the first frame main part, and the spacing between the second transition pressing part and the first frame main part is greater than 0. 11.The curved screen pasting device according to claim 8, wherein The main body supporting part is provided with an opening part on each of the opposite sides in the first direction, the second frame supporting part comprises a connecting part, a second frame main part and a second frame protruding part; the connecting part is located in the opening part and is detachably connected with the main body supporting part; the second frame main part is located on the connecting part, and the second frame protruding part is located on the second frame main part, and the second frame main part and the second frame protruding part extend along the second direction; The two ends of the second frame main part are respectively connected with two adjacent first sub-supporting parts, the height difference between the second frame main part and the main body supporting part is less than or equal to the height difference between the second sub-supporting part and the main body supporting part; the two ends of the second frame protruding part are respectively connected with two adjacent second sub-supporting parts, and the height difference between the second frame protruding part and the main body supporting part is less than the height difference between the second sub-supporting part and the main body supporting part; the second frame protruding part and the second frame main part are arranged in steps in the direction towards the main body supporting part; The second frame supporting part further comprises a third retaining wall located on the side of the second frame protruding part away from the main body supporting part, the curved side pressing part corresponding to the second frame protruding part is located on the side of the third retaining wall close to the main body supporting part and is arranged in close contact with the top of the second frame protruding part; the flexible pressing die further comprises a third transition pressing part connecting the curved side pressing part and the planar pressing part extending along the second direction, the third transition pressing part is arranged in position with the second frame main part, and the spacing between the third transition pressing part and the second frame main part is greater than 0. 12.The curved screen pasting device according to claim 2, wherein The gusset plate is arranged in close contact with the main body supporting part on the side close to the planar pressing part, and the spacing between the planar pressing part and at least the side of the gusset plate away from the base is greater than 0.

13. The curved screen pasting device of claim 8, wherein, The second flexible protruding part is arranged on the side of the planar pressing part close to the base and covers the backing plate in the second direction, the distance between the second flexible protruding part and the side of the backing plate away from the base is greater than 0, and the distance between the second flexible protruding part and the two sides of the backing plate arranged in the second direction is greater than 0. The main body supporting part comprises a second sinking part arranged close to each first frame supporting part, and the side of the second flexible protruding part close to the base is arranged in close contact with the bottom of the corresponding second sinking part.

14. The curved screen pasting device of claim 1, wherein, The screen body is provided with a light collecting area, the planar pressing part comprises a first planar pressing area and a second planar pressing area arranged adjacently, the first planar pressing area and the light collecting area are arranged in alignment when the screen body and the curved cover plate are in close contact, and the pressure applied by the base to the second planar pressing area is greater than the pressure applied by the base to the first planar pressing area.

15. The curved screen pasting device of claim 14, wherein, The side of the planar pressing part or the base close to the backing plate is provided with a pressure relief groove, the pressure relief groove is arranged in coincidence with the first planar pressing area in the direction perpendicular to the backing plate, and the distance between the bottom of the pressure relief groove and the backing plate is greater than 0. 16.The curved screen pasting device according to claim 14, wherein, The side of the backing plate close to the planar pressing part is provided with a pressure relief groove, the pressure relief groove is arranged in coincidence with the first planar pressing area in the direction perpendicular to the backing plate, and the distance between the bottom of the pressure relief groove and the planar pressing part is greater than 0.

17. The curved screen pasting apparatus according to claim 1, wherein, The curved cover plate comprises a first planar area and a first curved area connected to each other, and the first curved area is arranged around the first planar area; the side of the flexible pressing die away from the base comprises a second planar area and a second curved area connected to each other, and the second curved area is arranged around the second planar area. The first planar area and the second planar area are of the same shape, and the area of the first planar area is greater than the area of the second planar area.

18. A method for attaching a curved screen, comprising the following steps: fixing a curved cover plate on a cover plate fixing base; providing a curved screen attaching device according to any one of claims 1 to 17, and arranging the curved screen attaching device in alignment with the curved cover plate; fixing a screen body on the side of the flexible pressing die away from the base, so that the screen body is completely attached to the side of the flexible pressing die away from the base; and moving the curved screen attaching device towards the curved cover plate, so that the screen body is completely attached to the curved cover plate; wherein when the screen body and the curved cover plate are in close contact, the pressure applied by the base to the curved corner pressing part is greater than the pressure applied by the base to the planar pressing part.

19. The method of claim 18, wherein, The curved cover plate comprises a first planar area and a first curved area connected to each other near one side of the screen body, and the first curved area is arranged around the first planar area; the side of the flexible mold away from the base comprises a second planar area and a second curved area connected to each other, and the second curved area is arranged around the second planar area; the first planar area and the second planar area are of the same shape, and the area of the first planar area is greater than that of the second planar area; When the screen body is completely attached to the side of the flexible mold away from the base, the side of the screen body away from the flexible mold has a third planar area and a third curved area connected to each other, the third planar area corresponds to the second planar area, and the third curved area corresponds to the second curved area; the third planar area and the first planar area are of the same shape, and the area of the first planar area is greater than that of the third planar area; The curved screen attaching device is moved towards the curved cover plate to completely attach the screen body to the curved cover plate, comprising the following steps: The curved screen attaching device is moved towards the curved cover plate to completely attach the screen body to the curved cover plate, comprising the following steps: The curved screen attaching device is moved towards the curved cover plate to completely attach the screen body to the curved cover plate, comprising the following steps:

20. The method of claim 19, wherein, When the curved screen attaching device is moved towards the curved cover plate to make the third planar area of the screen body contact the first planar area of the curved cover plate, the distance between the edge of the first planar area and the edge of the third planar area is greater than or equal to 0.1 mm and less than or equal to 1 mm, and the distance between the edge of the first curved area away from the first planar area and the third curved area of the screen body in the direction parallel to the first planar area is greater than or equal to 0.5 mm and less than or equal to 5 mm.

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