Curved surface display device, manufacturing method thereof and laminating equipment

Abstract

The invention provides a curved-surface display device and a manufacturing method and laminating equipment thereof, and relates to the technical field of display, and the manufacturing method comprises the following steps: applying an external force to a cover plate of a curved-surface structure to enable the cover plate to deform into a cover plate of a plane structure; optical cement is attached to the cover plate of the plane structure; the display panel of the plane structure is attached to the side, provided with the optical cement, of the cover plate of the plane structure; the external force on the cover plate is removed, so that the cover plate and the display panel are deformed into a curved surface structure, and the curved surface display device is formed. According to the invention, the bonding surface of the optical cement is transferred from the sensitive display panel to the firmer cover plate, so that the problem of stress concentration at the edge of the display panel caused by traditional air bag bonding is effectively avoided, the black state uniformity index is obviously optimized, and the display quality problem of uneven display and the like caused by uneven stress of a display product is thoroughly solved.

Description

Technical Field

[0001] This disclosure relates to the field of display technology, and in particular to a curved display device and its manufacturing method and bonding equipment. Background Technology

[0002] With the continuous development of science and technology, more and more display products, such as mobile phones, tablets, laptops and smart wearable devices, are being widely used in people's daily lives and work, bringing great convenience to people's daily lives and work, and becoming an indispensable tool for people today.

[0003] Currently, curved display products are increasingly appearing in people's daily lives, such as automotive displays. In manufacturing curved display products, a flat display panel is typically first bonded to optical adhesive. Then, a curved heat-bending cover plate is bonded to the adhesive-coated display panel using an airbag-based vacuum fixture. During this bonding process, the display panel bends from a flat surface into a curved shape. However, this method, relying on airbag pressure, easily leads to uneven pressure distribution at the edges of the display panel, especially with pressure concentration at the corners. This results in poor uniformity of black levels at the edges of the display product, and uneven pressure distribution can also cause display defects such as unevenness. Summary of the Invention

[0004] To address the aforementioned technical problems, this disclosure provides a curved display device and its manufacturing method, as well as a bonding device, to solve the display quality issues caused by uneven pressure in related technologies.

[0005] In a first aspect, this disclosure provides a method for manufacturing a curved display device, including: Apply an external force to the curved cover plate to deform it into a planar cover plate; Optical adhesive is applied to the cover plate of the planar structure; The display panel of the planar structure is attached to the side of the cover plate of the planar structure where optical adhesive is provided; Remove the external force on the cover plate, causing the cover plate and display panel to be deformed into a curved structure, forming a curved display device.

[0006] Secondly, based on the same inventive concept, this disclosure also provides a bonding device for a curved display device, including: a transfer device, a bonding device, and a vacuum fixture, wherein the vacuum fixture includes multiple vacuum adsorption structures; The transfer device is used to transfer the cover plate into a vacuum fixture; the vacuum fixture is used to fix the cover plate of the planar structure; the attachment device is used to attach optical adhesive to the cover plate of the planar structure; the transfer device is also used to transfer the display panel above the optical adhesive and fix it to the cover plate of the planar structure.

[0007] Thirdly, based on the same inventive concept, this disclosure also provides a curved display device, which is manufactured using the method for manufacturing a curved display device provided in the first aspect. The curved display device includes a cover plate with a curved structure and a display panel. Optical adhesive is disposed on the side of the cover plate facing the display panel, and the cover plate is bonded to the display panel by the optical adhesive. The display panel includes a display area, and the optical adhesive covers the display area along the thickness direction of the curved display device, and the edge of the optical adhesive extends beyond the edge of the display area.

[0008] The technical solution provided in this disclosure has the following advantages compared with the prior art: The curved display device and its manufacturing method, as well as the bonding equipment disclosed herein, transform the two key steps most prone to defects—optical adhesive bonding and cover-display panel bonding—into high-yield, high-precision planar hard-to-hard bonding. This process can directly utilize mature, high-yield planar bonding equipment and technology, avoiding the development of expensive and complex curved surface bonding equipment. Furthermore, this disclosure transfers the bonding surface of the optical adhesive from the sensitive display panel to the more robust cover plate. Throughout this process, the display panel remains planar, only bearing uniform vertical pressure in the final hard-to-hard bonding stage (i.e., the bonding process between the planar cover plate and the planar display panel). This avoids excessive pressure from rollers during the critical optical adhesive bonding stage or uneven pressure from airbags during curved surface bonding. After bonding is completed, the external force is removed, and the cover plate and display panel slowly return to their curved structure together, making the stress release process more controllable and uniform. This effectively avoids the problem of stress concentration at the edge of the display panel caused by traditional airbag bonding, and significantly optimizes the black uniformity index. According to the test, the black uniformity index can be improved by 5% to 17% by using this method, which completely solves the problem of uneven display quality caused by uneven force on display products. Attached Figure Description

[0009] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0010] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 The diagram shown illustrates the manufacturing process of a curved surface display device in related technologies. Figure 2 The diagram shown is a flowchart of a method for manufacturing a curved display device according to an embodiment of this disclosure; Figure 3The diagram shows a process for manufacturing a curved surface display device. Figure 4 The diagram shows a schematic of using a vacuum adsorption structure to flatten the cover plate of the curved structure; Figure 5 The diagram shown is another flowchart of a method for manufacturing a curved display device provided in an embodiment of this disclosure; Figure 6 The diagram shows the state of the cover plate before and after the vacuum adsorption structure adsorbs the cover plate. Figure 7 The diagram shows a process of bonding a cover plate of a planar structure to a display panel of a planar structure. Figure 8 The diagram shown is another flowchart of a method for manufacturing a curved display device provided in an embodiment of this disclosure; Figure 9 The diagram shows a process of applying traction force to a cover plate using a traction structure. Figure 10 The diagram shown is another flowchart of a method for manufacturing a curved display device provided in an embodiment of this disclosure; Figure 11 The diagram shown is another flowchart of a method for manufacturing a curved display device provided in an embodiment of this disclosure; Figure 12 The diagram shows another process for manufacturing a curved surface display device; Figure 13 The diagram shows a schematic of a display device when the external force on the cover plate has not yet been removed. Figure 14 The diagram shown is a structural schematic of a curved display device provided in an embodiment of this disclosure; Figure 15 The image shown is a top view of a curved display device provided in an embodiment of this disclosure; Figure 16 The diagram shown illustrates the relative positions of some film layers in a curved display device. Figure 17 The diagram shown illustrates another relative positional relationship of some film layers in a curved display device. Detailed Implementation

[0012] To better understand the above-mentioned objectives, features, and advantages of this disclosure, the solutions disclosed herein will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0013] Numerous specific details are set forth in the following description in order to provide a full understanding of this disclosure, but this disclosure may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some, and not all, of the embodiments of this disclosure.

[0014] Figure 1 The diagram shown illustrates the manufacturing process of a curved display device in related technologies. Please refer to it. Figure 1 In related technologies, when manufacturing curved display products, a planar display panel 10' is typically first bonded to an optical adhesive 20'. Then, a curved hot-bending cover plate 30' is bonded to the display panel 10' with the optical adhesive 20' using an airbag-based vacuum fixture. During bonding, when the pressure difference between the upper and lower parts of the airbag mechanism is significantly greater than P2, the display panel bends from a flat surface into a curved surface, thus forming a curved display device. This method relies on airbag pressure; however, the soft nature of the airbags can easily lead to uneven pressure on the edges of the display panel. When the airbag mechanism is bonded, the force on the periphery of the display panel 10' is greater than that in the center, which is detrimental to black uniformity. The brightness ratio in black uniformity tests is low, typically below 40%, and uneven pressure distribution can also lead to display defects such as uneven display. Black uniformity refers to the ratio of the darkest brightness to the highest brightness in a surface scan.

[0015] In view of this, the present disclosure provides a curved display device and its manufacturing method and bonding equipment. First, an external force is applied to flatten the curved cover plate. Optical adhesive is then applied to the flattened flat cover plate. Next, the flat cover plate with the applied optical adhesive is hard-to-hard bonded to the flat display panel. Finally, the external force is removed, restoring the module to its curved structure. This method transforms the most defect-prone optical adhesive bonding and cover plate-display panel bonding steps into high-yield flat hard-to-hard bonding, thereby fundamentally solving the display quality problem caused by uneven pressure in traditional curved bonding and avoiding excessive pressure on the fragile display panel during the critical optical adhesive bonding stage.

[0016] The contents of this disclosure will be further described below with reference to the accompanying drawings and specific embodiments.

[0017] Figure 2 The diagram shown is a flowchart of a method for manufacturing a curved display device according to an embodiment of this disclosure. Figure 3 The diagram shown illustrates a process for manufacturing a curved display device. Please refer to it. Figure 2 and Figure 3 The present disclosure provides a method for manufacturing a curved display device, comprising: Step S1: Apply an external force to the curved cover plate 30 to deform it into a planar cover plate 30.

[0018] Step S2: Apply optical adhesive 20 to the cover plate 30 of the planar structure.

[0019] Step S3: Attach the planar display panel 10 to the side of the planar cover plate 30 where the optical adhesive 20 is provided.

[0020] Step S4: Remove the external force on the cover plate 30, so that the cover plate 30 and the display panel 10 are deformed into a curved structure to form a curved display device.

[0021] In the method for manufacturing a curved display device provided in this disclosure, the curved cover plate 30 is first flattened in step S1, and then optical adhesive 20 is applied to the deformed flat cover plate 30. Then, the flat display panel 10 is attached to one side of the flat cover plate 30 with the optical adhesive 20 applied. It can be seen that the manufacturing method provided in this disclosure transforms the two key steps most prone to defects—the application of the optical adhesive 20 and the bonding of the cover plate 30 to the display panel 10—into a high-yield, high-precision planar hard-to-hard bonding process. This process can directly utilize mature, high-yield planar bonding equipment and technology, avoiding the need to develop expensive and complex curved surface bonding equipment. Furthermore, this disclosure transfers the bonding surface of the optical adhesive 20 from the sensitive display panel 10 to the more robust cover plate 30. During this process, the display panel 10 remains flat, only bearing uniform vertical pressure in the final hard-to-hard bonding stage (i.e., the bonding process between the planar cover plate 30 and the planar display panel 10 in step S3 above). This avoids excessive pressure from rollers during the critical optical adhesive 20 bonding stage or uneven pressure from airbags during curved surface bonding. After bonding is completed, the external force is removed, and the cover plate 30 and display panel 10 slowly return to their curved structure, making the stress release process more controllable and uniform. This effectively avoids the problem of stress concentration at the edges of the display panel 10 caused by traditional airbag bonding, significantly optimizing the black state uniformity index. Experiments show that using this method can improve the black state uniformity index by 5% to 17%, completely solving the display quality problem caused by uneven force on display products.

[0022] Furthermore, in some traditional curved surface bonding processes, if the optical adhesive is first applied to the display panel, its size must be smaller than the size of the upper polarizer in the display panel, considering bonding tolerances. If the optical adhesive exceeds the range of the upper polarizer, air bubbles will form on the periphery due to crossing the step difference between the polarizer and the display panel, leading to uneven display. In the manufacturing method provided in this disclosure, the optical adhesive 20 is first applied to the flattened cover plate 30, thus eliminating the issue of polarizer step difference on the display panel 10. The final planar hard-to-hard bonding accuracy of this disclosure is high, effectively avoiding air bubble problems caused by the size limitation of the optical adhesive 20. Moreover, when the display device includes an upper polarizer disposed on one side of the display panel 10, this disclosure allows the size of the optical adhesive 20 to be larger than the area of ​​the upper polarizer of the display panel 10, which helps to improve the structural strength of the module and side protection.

[0023] Figure 4 The diagram shows a flattened cover plate 30 with a curved surface structure using a vacuum adsorption structure 91. Figure 5 The diagram shown is another flowchart of a method for manufacturing a curved display device according to an embodiment of this disclosure. Please refer to it. Figure 4 and Figure 5 In one optional embodiment of this disclosure, step S1, applying an external force to the curved cover plate 30 to deform it into a planar cover plate 30, includes: Step S101: Transfer the curved cover plate 30 to a vacuum fixture equipped with multiple vacuum adsorption structures 91, so that the cover plate 30 is positioned above the vacuum adsorption structures 91.

[0024] Step S102: Turn on the vacuum fixture and use the vacuum adsorption structure 91 to apply an adsorption force to the curved cover plate 30, so that the curved cover plate 30 is deformed into a planar cover plate 30.

[0025] The subsequent steps S2 to S4 are the same as those in the previous embodiments, and will not be repeated in this embodiment.

[0026] Traditional airbag bonding methods result in greater stress at the edges of the display panel than in the center, leading to pressure concentration at the corners and potentially causing uneven display. This solution transfers stress to the cover plate 30 via vacuum adsorption. The vacuum fixture itself is rigid and precise. This disclosure uses multiple vacuum adsorption structures 91 to flatten the curved cover plate 30, ensuring that the surface of the cover plate 30 is stretched to a uniform planar state. The applied adsorption force is uniform or nearly uniformly distributed, avoiding localized pressure concentration caused by airbags. This flattening operation avoids high-pressure, uneven curved bonding directly onto the display panel 10, transferring the highest-risk operation to the robust cover plate 30 (e.g., a heat-bent glass cover plate). After bonding, the external force is removed, and the cover plate 30 and display panel 10 slowly return to their curved structure. The stress release process is more controllable and uniform, effectively avoiding display quality problems caused by stress concentration at the edges of the display panel 10 due to traditional airbag bonding. Furthermore, after flattening the cover plate 30, the subsequent application of the optical adhesive 20 and the display panel 10 can all be completed in a flat state. Mature, high-yield planar bonding equipment and technology can be used directly, avoiding the need to develop and use expensive and difficult curved surface bonding equipment, thus reducing equipment investment and manufacturing costs.

[0027] Please continue to refer to this. Figure 4 In one optional embodiment of this disclosure, the curved cover plate 30 includes a first part 31 and a second part 32. The distance between the first part 31 and the vacuum adsorption structure is greater than the distance between the second part 32 and the vacuum adsorption structure. When the vacuum fixture is turned on, the adsorption force of the vacuum adsorption structure 91 corresponding to the first part 31 is controlled to be greater than the adsorption force of the vacuum adsorption structure 91 corresponding to the second part 32. It should be noted that when the adsorption forces of the vacuum adsorption structure 91 on the first part 31 and the second part 31 are different, the vacuum adsorption structures 91 at different positions can correspond to different vacuum sources.

[0028] The first part 31 of the cover plate 30 is typically located at the center / highest point of the curved surface, which is the area most difficult to flatten (most difficult to stretch) during the initial stage of deformation; the second part 32 is located at the edge / lower point, which is the area most easily adsorbed into place. If the same vacuum adsorption force is applied to the entire cover plate 30, the closer second part 32 will be adsorbed into place first, while the farther first part 31 may not be able to fit completely or will require more time. Once the second part 32 is adsorbed into place first, it may bear greater tensile stress, which may ultimately lead to unevenness in the entire flattening process. Therefore, this disclosure sets the adsorption force corresponding to the first part 31 to be greater than the adsorption force corresponding to the second part 32, which can ensure that the most difficult-to-flatten middle area (the first part 31) receives greater tension and can be quickly and thoroughly adsorbed into place. This is beneficial for achieving synchronous flattening, avoiding unnecessary peripheral stress concentration in the closer second part 32 due to excessive force, and ensuring that the entire curved surface deforms into a planar structure at the same time and with a uniform strain rate. By applying dynamic and differentiated forces, the resulting planar cover plate 30 is an ideal plane with the most uniform stress distribution. This ensures that subsequent optical adhesive bonding and display panel bonding are completed on a cover plate with no stress residue and high flatness. By optimizing the stress distribution and flatness of the bonding cover plate, display defects such as uneven display and deterioration of black uniformity caused by uneven bonding cover plate are eliminated from the source.

[0029] Please continue to refer to this. Figure 4 In one optional embodiment of this disclosure, the curved cover plate 30 includes a first part 31 and a second part 32. The distance between the first part 31 and the vacuum adsorption structure 91 is greater than the distance between the second part 32 and the vacuum adsorption structure. The density of the vacuum adsorption structure 91 corresponding to the first part 31 is greater than the density of the vacuum adsorption structure 91 corresponding to the second part 32.

[0030] The first part 31 of the cover plate 30 is typically located at the center / highest point of the curved surface, which is the area most difficult to flatten (most difficult to stretch) during the initial stage of deformation; the second part 32 is located at the edge / lower point, which is the area most easily adsorbed into place. The area furthest away (the first part 31) requires the greatest total tensile force to be pulled down, and relying solely on uniform adsorption force may be inefficient or unable to flatten completely. While maintaining relatively stable local unit adsorption force, this disclosure concentrates the total tensile force through a higher density of adsorption structure 91. This ensures that the area most difficult to flatten (the first part 31) receives a greater total tensile force, thus being stretched completely and effectively into place. The concentrated tensile force in the first part 31 allows it to approach the fixture plane more quickly, and is more synchronized with the deformation rate of the second part 32, which is beneficial for achieving uniform flattening of the whole and avoiding excessive stretching of the periphery. Compared to adjusting different vacuum levels in different areas, the method of distributing tensile force through vacuum adsorption structure density (physical design) is more stable, reliable, and easy to replicate. Once the vacuum fixture design is determined, its tensile force distribution characteristics are fixed, which is beneficial for process repeatability in large-scale production. This results in a planar cover plate 30 that is an ideal plane with uniform stress distribution, ensuring that subsequent optical adhesive application and display panel attachment are completed on a highly flat cover plate. This eliminates the possibility of uneven display and deterioration of black uniformity caused by unevenness of the attached cover plate. In this embodiment, the vacuum adsorption structures 91 at different locations can correspond to the same vacuum source.

[0031] Please continue to refer to this. Figure 4 When the density of the vacuum adsorption structure 91 corresponding to the first part 31 is greater than the density of the vacuum adsorption structure 91 corresponding to the second part 32, in an optional embodiment of this disclosure, when the vacuum fixture is turned on, the adsorption force of the vacuum adsorption structures 91 in different areas is controlled to be the same. Thus, all vacuum adsorption points on the fixture can be connected to the same vacuum system (the same vacuum pump, the same main control valve). There is no need to configure additional sub-vacuum circuits or complex precision proportional control valves to control the vacuum level in different areas. This reduces the number of precision control components (such as sensors, solenoid valves, and regulating valves) that need to be purchased and maintained, lowering equipment investment and subsequent maintenance costs. Operators only need to set a unified vacuum level parameter, rather than multiple vacuum level parameters for different areas, making equipment debugging and daily production operations simpler and faster. By increasing the density of the adsorption structure 91 in the most difficult-to-flatten area (first part 31), the total tensile force obtained in that area is maximized, effectively achieving uniform flattening.

[0032] Figure 6 The diagram shown illustrates the state of the cover plate before and after adsorption by the vacuum adsorption structure. Please refer to it. Figure 6Optionally, the vacuum adsorption structure 91 mentioned in the embodiments of this disclosure can be embodied as a suction cup, for example. In the initial state, the suction cup can be a distance A above the plane of the vacuum fixture's flat plate. After the suction cup adsorbs onto the cover plate, it can retract downwards, thus ensuring that the suction cup can adsorb onto the cover plate at a higher height.

[0033] The above embodiments illustrate a scheme where the upper surfaces of multiple vacuum adsorption structures 91 are flush. However, this disclosure is not limited to this. In other embodiments of this disclosure, the heights of different vacuum adsorption structures 91 can be flexibly adjusted. For example, the vacuum adsorption structure 91 corresponding to the first part 31 (with greater height) of the cover plate 30 can be defined as the first vacuum adsorption structure, and the vacuum adsorption structure 91 corresponding to the second part 32 (with less height) of the cover plate 30 can be defined as the second vacuum adsorption structure. Optionally, in the initial state, the heights of the first and second vacuum adsorption structures relative to the plane of the vacuum fixture plate are different. For example, the first vacuum adsorption structure can be higher than the plane of the vacuum fixture plate by a first distance, and the second vacuum adsorption structure can be higher than the plane of the vacuum fixture plate by a second distance, the second distance being less than the first distance. In this way, the distance between the first vacuum adsorption structure and the higher first part 31 can be reduced. When the first suction cup vacuum adsorption structure adsorbs onto the first part 31, it can extend and retract downwards to hold the higher first part 31. Thus, setting vacuum adsorption structures of different heights according to different areas of the cover plate 30 also helps to ensure that the cover plate 30 is evenly flattened.

[0034] It should be noted that for products with a large radius of curvature (e.g., R > 2000 mm, small curvature), the cover plate 30 can be flattened simply by vacuum adsorption, without the need for additional external force. For products with a large curvature, other external forces can be used to assist in flattening. In an optional embodiment of this disclosure, the curved cover plate 30 is transferred to a vacuum fixture provided with multiple vacuum adsorption structures 91. Specifically, a transfer device is used to transfer the curved cover plate 30 to the vacuum fixture provided with multiple vacuum adsorption structures 91. Before opening the vacuum fixture, the process also includes applying pressure to the cover plate 30 of the curved structure using a transfer device to reduce the curvature of the cover plate 30 of the curved structure.

[0035] For cover plates with a small radius of curvature (e.g., R≤2000mm), the curvature is large, and the initial distance between the first part of the cover plate 30 and the vacuum adsorption structure is too large. If the flattening is done entirely by vacuum adsorption from a distance, the adsorption build-up time is long and the efficiency is low. If the initial curvature is large, the distance between the first part of the cover plate 30 and the vacuum adsorption structure is too far, and extremely high vacuum may be required to completely pull it down. Excessive vacuum may cause the external adsorption force to be too large instantaneously, leading to stress concentration or material damage risks. This solution uses a transfer device to pre-pressurize the cover plate to initially flatten its curvature. The pre-pressurization operation effectively reduces the initial distance between the cover plate and the vacuum adsorption structure. This allows subsequent vacuum adsorption to start working in a state closer to a plane, significantly improving the efficiency of vacuum adsorption and the success rate of flattening, especially suitable for products with large curvature. In this disclosure, pre-pressurization shares part of the deformation work of the large stroke, which greatly shortens the adsorption time required for vacuum adsorption. This directly and effectively shortens the production cycle and improves the overall production capacity. Furthermore, the mechanical / flexible forces of the transfer device pre-deform the material gently, avoiding the violent stretching that relies entirely on vacuum adsorption in the initial stage. Subsequent vacuum adsorption can complete the final bonding under a gentler and safer vacuum level, reducing the risk of the cover plate breaking due to stress concentration during stretching. This composite force application method allows pure vacuum adsorption fixtures, which were originally only suitable for small curvatures, to be compatible with cover plates with larger curvatures, thus broadening the application range of the equipment.

[0036] Figure 7 The diagram illustrates a process of bonding a planar cover plate 30 to a planar display panel 10. When bonding the display panel 10 to the planar cover plate 30 with the optical adhesive 20 attached, in a vacuum fixture, the display panel 10 is first fixed to one side of the upper platform 80 in the vacuum fixture, and then transferred to the side of the cover plate 30 with the optical adhesive 20 via the upper platform 80. After bonding the display panel 10 to the cover plate 30, the upper platform 80 is removed, and the suction force of the vacuum adsorption structure 91 on the cover plate 30 is released. That is, in an optional embodiment of this disclosure, in step S4 above, after bonding the display panel 10 to the cover plate 30, the external force on the cover plate 30 is released, causing the cover plate 30 and the display panel 10 to be deformed into a curved structure, including: closing the vacuum fixture, releasing the suction force of the vacuum adsorption structure 91 on the cover plate 30, and causing the cover plate 30 and the display panel 10 to be deformed into a curved structure.

[0037] In this disclosure, the deformation recovery is driven by the elastic potential energy of the cover glass 30 (such as hot-bent glass). This elastic potential energy, after the vacuum suction force disappears, uniformly and naturally drives the cover glass 30 to deform, bringing the entire module back to its preset curved shape. Impact avoidance: Compared to using mechanical force (such as pushing or pressing) to force deformation, this recovery relying on the material's own potential energy is the gentlest and most uniform. Since the display panel 10 and the cover glass 30 are bonded together in a planar state with the highest precision, they are tightly bonded by optical adhesive 20. During the stress relief and release process, the optical adhesive 20 layer is not subjected to concentrated impact force, maximizing the preservation of the high yield and high black uniformity effect obtained from planar bonding. Moreover, the process of restoring the curved shape does not require additional equipment, devices, or complex control programs (such as hydraulic or pneumatic push rods); it only requires disconnecting the vacuum. This simplifies the equipment structure, streamlines the control system, and reduces overall manufacturing costs and maintenance difficulty. When the cover plate 30 is a hot-bent glass cover plate, the hot-bent glass cover plate 30 has "memory" properties, and its restored curved surface shape can accurately match the curved surface requirements at the time of design. The display panel 10 and the optical adhesive 20 passively follow the deformation of the cover plate 30, and the curvature of the final curved display device is highly consistent with the designed curvature of the cover plate 30.

[0038] Figure 8 The diagram shown is another flowchart of a method for manufacturing a curved display device according to an embodiment of this disclosure. Figure 9 The diagram illustrates a process of applying traction force to the cover plate 30 using a traction structure 92. In an optional embodiment of this disclosure, step S1 involves applying an external force to the curved cover plate 30 to deform it into a planar cover plate, including: S111, Transfer the curved cover plate 30 to a vacuum fixture equipped with multiple vacuum adsorption structures 91; S112. The traction structure 92 of the vacuum fixture is used to apply a traction force to the cover plate 30, and the vacuum adsorption structure 91 is used to apply an adsorption force to the curved cover plate 30, so that the curved cover plate 30 is deformed into a planar cover plate 30.

[0039] For cover plates 30 with very large curvature (e.g., the distance between the center of the curved surface and the vacuum adsorption structure is too large), the vacuum required for pure vacuum adsorption is too high, which may lead to incomplete adsorption or damage to the cover plate 30. Moreover, the time required to establish adsorption for large-curvature cover plates 30 through pure vacuum adsorption is long, affecting the production cycle. The vacuum fixture provided in this embodiment introduces a traction structure 92 capable of applying traction force to the cover plate 30. The traction force is mainly responsible for initially stretching the cover plate 30 from a curved surface to a near-planar state, completing most of the deformation stroke; the vacuum adsorption force is responsible for accurately and uniformly flattening the cover plate 30 onto the fixture surface under the action of the traction force. This ensures that even large-curvature cover plates 30 can be flattened quickly and reliably. Distributing the stretching task to the traction structure 92 and the vacuum adsorption structure 91 avoids excessive local stress concentration caused by a single force source (such as extremely high vacuum). This can effectively reduce the risk of structural damage to the cover plate 30 during the flattening process. Because the traction structure 92 can directly apply a strong, quantitative deformation force, it can pull the cover plate 30 from its curved state to the minimum distance required for adsorption much faster than pure vacuum adsorption, thus greatly shortening the production cycle for flattening. This solution allows the vacuum fixture to be compatible with products with a wider range of curvatures. For products with small curvatures, vacuum adsorption can be used alone; for products with large curvatures, the traction structure 92 is activated to assist in flattening, improving the versatility of the equipment.

[0040] Please continue to refer to this. Figure 8 and Figure 9 In one optional embodiment of this disclosure, in step S112, the starting moment of applying traction force to the cover plate 30 using the traction structure 92 of the vacuum fixture is before the starting moment of applying adsorption force to the curved cover plate 30 using the vacuum adsorption structure 91. The traction force (usually mechanical or magnetic) can quickly and efficiently stretch (pre-deform) the cover plate 30 from the curved structure to a near-planar state, significantly shortening the deformation stroke. After the cover plate 30 is pulled to near the plane, the vacuum adsorption force is then activated. At this time, the vacuum adsorption only needs to complete the final, minimum stroke of precise bonding work, resulting in a short adsorption force establishment time and high efficiency. This effectively avoids the problem of uneven adsorption or adsorption failure that may occur when the vacuum adsorption structure 91 is activated from a distance. With the assistance of traction force, the starting environment of vacuum adsorption is more ideal. The traction force completes most of the strain first, and then the vacuum adsorption force applies uniform pressure at the end of the deformation, precisely fixing the cover plate 30 on the surface of the fixture. This smooth relay of force makes the stress changes on the cover plate 30 more gradual and controllable, avoiding sudden stress changes. This "coarse-to-fine" force application sequence is a key means to ensure high-precision bonding while achieving short production cycles, thereby increasing the equipment's capacity.

[0041] It should be noted that in practical applications, when the traction force is started first and then the vacuum adsorption force is started, the traction force can be applied for a period of time and then the vacuum adsorption force can be applied. The traction force can be canceled when the vacuum adsorption force is applied, or the traction force and the vacuum adsorption force can be applied simultaneously for a period of time. In the later stage, the traction force can be stopped first and then the vacuum adsorption force can be stopped. This disclosure does not make specific limitations on this.

[0042] Please refer to Figure 8 and Figure 9 In one optional embodiment of this disclosure, after the curved cover plate 30 is transferred to a vacuum fixture provided with a plurality of vacuum adsorption structures 91, that is, after step S111 and before step S112, the method further includes: controlling the traction structure 92 to move to the two sides of the cover plate 30, adjusting the height of the traction structure 92 to match the height of the cover plate 30, and then using the traction structure 92 to clamp the cover plate 30.

[0043] This solution uses mechanical grippers or similar devices as a traction structure to apply a downward mechanical force (or lateral traction force) to the edge of the cover plate 30 through clamping, achieving pre-deformation. The large-curvature cover plate 30 requires a strong and precise initial pulling force to quickly and effectively flatten it. The mechanical grippers must be precisely positioned at the edge of the cover plate 30 to apply an effective and controllable pulling force without damaging the surface or edge of the cover plate 30. Different curvature cover plates 30 have different edge heights and side shapes, and the traction structure has height adjustment capabilities. Positioning the traction structure on both sides of the cover plate 30 ensures that the force application point is located in the stress concentration area at the edge of the cover plate 30. This allows the applied traction force to most effectively stretch the cover plate 30 from a curved structure to near-flatness. The displacement and height adjustment of the traction structure ensures that the grippers can hold the cover plate 30 with a precise posture and matching height, avoiding collisions or stress damage to the cover plate 30 during clamping. Furthermore, the mechanical gripping can apply a defined and powerful downward pull (or outward pull), which is more efficient and allows for a larger deformation stroke when dealing with large curvatures, enabling the cover plate 30 to be quickly pulled from the curved surface to a plane close to the vacuum fixture. The adjustable height of the traction structure means that the same traction system can be applied to curved cover plates 30 with different curvatures (i.e., different edge heights), improving the equipment's compatibility and versatility for different product models. Moreover, considering that the clamping force applied by the mechanical grippers is quantifiable and adjustable, by precisely controlling the clamping force and stretching stroke, stress changes can be kept within a safe range, preparing for subsequent precise vacuum adsorption bonding.

[0044] Please continue to refer to this. Figure 9In one optional embodiment of this disclosure, the curved cover plate 30 includes a first part 31 and a second part 32. The distance between the first part 31 and the vacuum adsorption structure 91 is greater than the distance between the second part 32 and the vacuum adsorption structure. That is, the first part 31 is the higher arched portion of the curved display panel 10, and the second part 32 consists of the portions on both sides of the first part 31. The traction structure 92 corresponds at least to the first part 31. When the traction structure of the vacuum fixture applies a traction force to the cover plate 30, the traction structure 92 is controlled to apply a traction force to at least the first part 31.

[0045] Since the first part 31 is furthest from the vacuum adsorption structure (usually the center of the curved surface), it is the most difficult area to flatten and has the largest deformation range. Therefore, this design concentrates the strong traction force on this part. If the traction force is applied evenly to the entire cover plate 30, most of the force will be consumed in the relatively easy-to-flatten second part 32 (edge), while the most difficult-to-flatten first part 31 (center) may not deform sufficiently. Concentrating the traction force on the first part 31, which has the greatest deformation difficulty, ensures that the limited traction energy is used in the most efficient place, quickly overcoming the huge elastic potential energy in the center region of the curved surface and accelerating the overall deformation of the cover plate 30. By applying strong force to the most difficult area, the deformation rates of the first part 31 and the second part 32 tend to be consistent. This avoids uneven deformation caused by the edge region being flattened first while the center region lags behind, and helps to finally obtain a planar substrate with high flatness and low residual stress. The second part 32 is closer to the vacuum adsorption structure and can be bonded mainly by vacuum adsorption or a small traction force. This approach reduces the application of unnecessary strong traction force to the second part 32, avoids excessive stress concentration at the edges, and protects the structural integrity of the edge area of ​​the cover plate 30. The resulting flattened cover plate 30 has a more reasonable and uniform stress distribution, which provides the most ideal planar substrate for subsequent application of optical adhesive 20 and bonding of the display panel 10, further consolidating the advantages of this disclosure in terms of high yield.

[0046] In one optional embodiment of this disclosure, the traction structure may also correspond to the second part 32, that is, the traction structure 92 can be introduced at the positions of the first part 31 and the second part 32. When the traction structure 92 of the vacuum fixture applies a traction force to the cover plate 30, the traction force of the traction structure 92 corresponding to the first part 31 is controlled to be greater than the traction force of the traction structure 92 corresponding to the second part 32.

[0047] The first part 31 is located at the center of the curved surface, far from the vacuum adsorption structure, making deformation more difficult and requiring a larger traction force to accelerate the deformation. The second part 32 is located at the edge of the curved surface, close to the vacuum adsorption structure, making deformation easier and requiring only a smaller traction force to assist in the deformation. If the traction force is applied uniformly across the entire cover plate 30, the area farther away (the first part 31) will not deform sufficiently, while the area closer away (the second part 32) may deform first. Applying the same traction force to the second part 32 as to the first part 31 may cause the second part 32 to bear excessive and unnecessary initial tension, leading to edge stress concentration. This disclosure sets the traction force of the traction structure corresponding to the first part 31 to be greater than that of the traction structure corresponding to the second part 32, so that the area most difficult to stretch receives a stronger tension matching its deformation difficulty. This allows the entire cover plate 30 to deform towards the plane at a similar rate, ensuring the synchronicity of the deformation process and the high uniformity of the final planar structure. Applying a smaller traction force to the second part 32 ensures that it can effectively assist in flattening while avoiding edge stress concentration or excessive stretching due to excessive force. This maximizes the protection of the integrity of the cover plate 30's edges. This precise and efficient force distribution allows the pre-deformation process of the cover plate 30 to be completed in the shortest possible time, creating conditions for subsequent vacuum adsorption precision bonding and shortening the production cycle. The traction structure 92 covers the entire area of ​​the cover plate 30, but through differentiated control of the traction force, it can flexibly adapt to products with different curvatures (i.e., different distance differences between the first part 31 and the second part 32). By adjusting the traction force ratio, the leveling strategy can be easily adjusted, enhancing the equipment's process flexibility.

[0048] In one alternative embodiment of this disclosure, the traction force applied to the cover plate 30 by the traction structure 92 is either magnetic or mechanical. When the traction force is magnetic, the traction structure may include, for example, an electromagnet or a permanent magnet, and magnetic materials (such as a metal frame) may be provided or utilized at the corresponding position on the cover plate 30. When the traction force is mechanical, the traction structure may include, for example, a gripper, a push rod, or a clamping mechanism. For a cover plate 30 with a large curvature, a strong and controllable external force is required to assist in vacuum adsorption and flatten the cover plate 30 with a large curvature. Magnetic attraction is non-contact, avoiding the minor damage or marks that mechanical grippers may cause to the edges or surfaces of the cover plate 30. Electromagnets can apply and remove the pulling force instantaneously, with a fast response speed, which helps to shorten the production cycle, and no additional mechanical reset is required when the external force is removed. Mechanical force (such as clamping) can apply a defined and strong pulling force (or horizontal pulling force) perpendicular to the adsorption surface, with a stable force value that is easy to monitor and control with feedback. For large-curvature cover plates 30 requiring significant deformation forces, mechanical force often provides a more reliable pulling force than magnetic force. Magnetic force is suitable for structural designs where the cover plate edges contain magnetic materials, or for designs where the cover plate is fixed to the edge using magnetic grippers; mechanical force is suitable for products with edge designs that allow for clamping and require extremely high traction forces. This flexibility allows the solution of the present invention to adapt to a wider range of product specifications and production needs.

[0049] Figure 10 The diagram shown is another flowchart of a method for manufacturing a curved display device according to an embodiment of this disclosure. Please refer to it. Figure 10 In an optional embodiment of this disclosure, when the traction structure 92 of the vacuum fixture applies a traction force to the cover plate 30 and the vacuum adsorption structure 91 applies an adsorption force to the curved cover plate 30, the curved cover plate 30 is transferred to the vacuum fixture provided with multiple vacuum adsorption structures 91. Specifically, step S121 involves using a transfer device to transfer the curved cover plate 30 to the vacuum fixture provided with multiple vacuum adsorption structures 91. Before opening the vacuum fixture, step 122 is included: applying pressure to the cover plate 30 of the curved structure using a transfer device to reduce the curvature of the cover plate 30 of the curved structure.

[0050] Next, in step 123, the traction structure of the vacuum fixture is used to apply a traction force to the cover plate 30, and the vacuum adsorption structure 91 is used to apply an adsorption force to the curved cover plate 30, so that the curved cover plate 30 is deformed into a planar cover plate 30. The subsequent steps S2 to S4 are the same as in the previous embodiment, and will not be described again in this embodiment.

[0051] For cover plates 30 with particularly large curvatures (such as extra-large screens or extremely curved surfaces), even with the assistance of traction, the distance between the center of the cover plate 30 and the vacuum adsorption structure can still be very large. Both the traction structure and vacuum adsorption require time to start up and reach their maximum effectiveness. Pre-pressurization can advance the most time-consuming "large stroke initial deformation" in the flattening process, which is key to further shortening the production cycle. In the complex combined force application startup phase, if all the traction force and vacuum adsorption force are applied instantaneously, it may cause a sudden increase in local stress. Pre-pressurization provides a smooth transition.

[0052] In this disclosure, the transfer device completes the first step of flexible pre-deformation, the traction structure completes the second step of strong deformation, and vacuum adsorption completes the third step of precise bonding. This triple relay method of "flexible pre-compression → mechanical strong pulling → vacuum solidification" allows the flattening process to be completed in the shortest possible time, greatly shortening the production cycle. The total stress required for flattening is decomposed into three stages and completed step by step. This avoids the stress reaching its maximum instantaneous value in any single stage, ensuring that the stress change during the deformation process of the cover plate 30 is the most gradual and controllable. This effectively reduces the risk of damage to the cover plate 30 with extremely large curvature and improves the yield. Even if the traction structure or vacuum adsorption structure 91 experiences a brief start-up delay or suction fluctuation, the cover plate 30 can still maintain a relatively stable state because the transfer device has already completed the initial pre-compression, improving the reliability and anti-interference ability of the entire process. This combination scheme can be compatible with curved display devices with the largest curvature and the highest deformation difficulty currently on the market, broadening the application scope of the technical solution of this invention.

[0053] In one optional embodiment of this disclosure, step S4, removing the external force on the cover plate 30 to deform the cover plate 30 and the display panel 10 into a curved structure, includes: closing the vacuum fixture and removing the suction force of the vacuum adsorption structure on the cover plate 30; moving the traction structure to the initial position and canceling the traction force of the traction structure on the cover plate 30, so that the cover plate 30 and the display panel 10 are deformed into a curved structure.

[0054] The traction structure typically applies concentrated force to the edge or specific point of the cover plate 30, while the vacuum adsorption force is a uniform surface force. By first canceling the overall surface adsorption force and then slowly releasing the traction force applied by the traction structure, the concentrated stress at the edge of the cover plate 30 is ensured to be released gradually, achieving a smooth stress transition from surface to point and avoiding potential cracking issues that might occur if the traction force is released first. After closing the vacuum fixture, the traction structure is moved to its initial position, ensuring that the traction structure (such as grippers) is completely disengaged when the cover plate 30 begins to deform and recover, avoiding interference, collision, or friction from the mechanical structure during the recovery process, thus protecting the integrity of the cover plate 30 or the module edge. In this disclosure, the dynamics of cover plate deformation recovery rely entirely on the release of the cover plate's own elastic potential energy, which is the most natural and gentle recovery method. This ensures that during the curved surface recovery process, the display panel 10 and the optical adhesive 20 adhesive layer are not subjected to sudden mechanical impacts or uneven torque, maximizing the high yield advantage obtained from planar bonding. The hot-bent glass cover 30 has "memory" properties; after the external force is removed, it will precisely return to its pre-set curved shape. Because the display panel 10 and the optical adhesive 20 are tightly bonded, the final curved shape of the module has high precision and fully meets the product design requirements.

[0055] The foregoing embodiments rely on a vacuum environment to complete most of the bonding work, requiring the introduction of vacuum equipment. However, this disclosure is not limited thereto; in some other embodiments of this disclosure, the cover plate 30 can also be flattened in a non-vacuum environment.

[0056] Figure 11 The diagram shown is another flowchart of a method for manufacturing a curved display device according to an embodiment of this disclosure. Figure 12 The diagram shown illustrates another process for manufacturing a curved display device. Please refer to it. Figure 11 and Figure 12 In one optional embodiment of this disclosure, applying an external force to the curved cover plate 30 to deform it into a planar cover plate 30 includes: Step S131: Transfer the cover plate 30 of the curved structure to a platform above the platform on which the viscoelastic material is provided, so that the curved structure comes into contact with the viscoelastic material 60; Step S132: Apply pressure to the curved cover plate 30 using the pressing machine 70 to deform the curved cover plate 30 into a planar structure and fix it with a viscoelastic material.

[0057] Following the aforementioned steps, the following is also included: Step S2: Apply optical adhesive 20 to the cover plate 30 of the planar structure.

[0058] Step S3: Attach the planar display panel 10 to the side of the planar cover plate 30 where the optical adhesive 20 is provided.

[0059] Step S4: Remove the external force on the cover plate 30, so that the cover plate 30 and the display panel 10 are deformed into a curved structure to form a curved display device.

[0060] This embodiment uses a viscoelastic material 60 in conjunction with a pressing platform 70 to transform a curved cover plate 30 into a planar cover plate 30. The viscoelastic material (such as a specially formulated silicone pad, rubber, or a highly viscous colloid) possesses the property of retaining its shape after deformation. After the pressing platform is withdrawn, its adhesiveness temporarily overcomes the elastic potential energy of the cover plate 30, fixing it in a planar state, thereby completing optical adhesive application and panel bonding in a planar state. This method overcomes the limitations of a vacuum environment; once the cover plate 30 is pressed into a planar shape, the adhesive force of the viscoelastic material can temporarily fix the cover plate 30 in a planar state. This allows subsequent optical adhesive application and panel bonding to be completed in a non-vacuum environment, greatly reducing equipment costs and manufacturing complexity. In this disclosure, the viscoelastic material provides continuous and stable adhesive force, effectively overcoming the elastic potential energy of the cover plate 30. This "active adhesion" fixing method avoids the influence of air pressure fluctuations that may occur with pure vacuum adsorption, ensuring reliable fixing results. The pressing platform 70 is typically a rigid plane, which applies highly uniform pressure to the curved cover plate 30. This ensures that the internal stress distribution of the cover plate 30 is more uniform than that of an air bladder or complex mechanical forces during its deformation into a plane, avoiding localized pressure concentration. This type of equipment requires no vacuum, has a simple structure, is easy to maintain and debug, and is beneficial for large-scale production and rapid equipment deployment.

[0061] When the viscoelastic material 60 is used in conjunction with the pressing machine 70 to transform the curved cover plate 30 into a planar cover plate 30, in an optional embodiment of this disclosure, in the above step S4, removing the external force on the cover plate 30 and transforming the cover plate 30 and the display panel 10 into a curved structure includes: removing the viscoelastic material on one side of the cover plate 30 to transform the cover plate 30 and the display panel 10 into a curved structure.

[0062] The design of viscoelastic materials typically allows for removal via peeling. This removal operation is controlled and reliable, ensuring that adhesive forces are completely and cleanly released, paving the way for subsequent surface restoration. Once the viscoelastic material is removed, the cover plate's elastic potential energy is fully released. The restoration force comes solely from the cover plate's own elasticity, resulting in a natural and gentle deformation recovery process. This avoids the stress unevenness and transients that can result from forced deformation using external mechanical forces (such as pushing or lifting), maximizing the protection of bonding quality. During the restoration process, the stress changes in the module are minimal, and the optical adhesive and display panel are not subjected to additional mechanical shocks or shear forces. This allows the high yield and high display uniformity advantages of planar bonding to be fully preserved. The removal operation can be performed using automated robotic arms or peeling mechanisms, seamlessly integrating with automated processes on large-scale production lines. The peeled material can also be collected or replaced, meeting factory production requirements.

[0063] Figure 13 The diagram shown illustrates one possible structure of the display device when the external force on the cover plate 30 has not yet been removed. Please refer to the diagram. Figure 13 In one optional embodiment of this disclosure, the display panel 10 is a liquid crystal display panel 10, and a first polarizer 40 is attached to the side of the liquid crystal display panel 10 facing the cover plate 30; when attaching optical adhesive 20 to the cover plate 30 with a planar structure, the attachment area of ​​the optical adhesive 20 is controlled to be larger than the area of ​​the first polarizer 40 in the display panel 10.

[0064] It should be noted that when the display panel 10 is a liquid crystal display panel 10, before the liquid crystal display panel 10 is attached to the cover plate 30 of the planar structure, a polarizer has been attached to the side of the liquid crystal display panel 10 facing the cover plate 30. The polarizer on the side closer to the cover plate 30 is the first polarizer 40, which corresponds to the upper polarizer of the display device.

[0065] In conventional bonding, if the size of the optical adhesive 20 exceeds the area of ​​the upper polarizer on the display panel 10, the adhesive 20 will cross the step difference (height difference) between the edge of the upper polarizer and the display panel 10. When the adhesive 20 crosses the step difference, it is difficult to completely fill or evenly bond, resulting in air bubbles and damaged adhesive shape around the optical adhesive 20, which in turn causes uneven display defects in the display panel 10. Therefore, conventional solutions must strictly control the optical adhesive 20 to be recessed within the area of ​​the upper polarizer. In this disclosure, the optical adhesive 20 is first attached to the flattened cover plate 30. At this time, the bonding of the optical adhesive 20 to the cover plate 30 does not involve the problem of polarizer step difference on the display panel 10, and the size of the optical adhesive 20 can be freely made larger than the area of ​​the upper polarizer of the display panel 10. When finally bonding the cover plate 30 and optical adhesive 20 to the display panel 10, the bonding precision is high because both components are planar. Furthermore, the optical adhesive 20 is already cured on the cover plate 30, preventing it from crossing step differences when attaching to the display panel 10 and cover plate 30. This fundamentally solves the problems of peripheral bubbles and uneven display caused by optical adhesive crossing step differences in traditional solutions. Traditional solutions require extremely small alignment tolerances when the optical adhesive 20 is attached to the display panel 10; otherwise, the optical adhesive 20 may extend beyond the edge of the polarizer. This solution allows for greater tolerance margins when the optical adhesive 20 is first flattened and bonded, simplifying the alignment difficulty of the piece-to-piece bonding of the optical adhesive 20. Moreover, the increased size of the optical adhesive 20 better covers the side area between the display panel 10 and cover plate 30, facilitating subsequent structural adhesive filling or side protection, and enhancing the overall structural strength and dust and water resistance of the module.

[0066] In one optional embodiment of this disclosure, the display panel 10 is any one of a liquid crystal display panel, an organic light-emitting display panel, or an inorganic light-emitting diode display panel.

[0067] In related technologies, whether it's a liquid crystal display panel, an organic light-emitting display panel, or an inorganic light-emitting display panel, they all require a process of bending the flat panel into a curved surface when bonding with a curved cover plate. During this process, the display panel (especially its fragile array layer and other structures) is subjected to enormous bending stress, shear stress, and localized pressure. This invention fundamentally eliminates all stress risks experienced by display panels during bending by transferring all high-risk bonding operations to a high-yield flat state. Therefore, this method is effective in eliminating stress-induced display unevenness or pixel damage in various types of display panels, making this invention not only limited to traditional automotive display products but also applicable to high-end consumer electronics curved displays with higher requirements for flexibility and display quality.

[0068] Please combine Figure 4Based on the same inventive concept, this disclosure also provides a bonding device for a curved display device, comprising: a transfer device, an attachment device, and a vacuum fixture, wherein the vacuum fixture includes a plurality of vacuum adsorption structures 91; the transfer device is used to transfer a cover plate 30 into the vacuum fixture; the vacuum fixture is used to fix the cover plate 30 of the planar structure; the attachment device is used to attach optical adhesive 20 to the cover plate 30 of the planar structure; the transfer device is also used to transfer the display panel 10 above the optical adhesive 20 and fix it to the cover plate 30 of the planar structure.

[0069] In this bonding equipment, the vacuum fixture acts as a combination of the flattening module and the bonding module. After flattening and fixing the curved cover plate 30, it provides a rigid, highly flat planar reference, ensuring that subsequent optical adhesive 20 application and panel bonding are completed with the highest precision. The combination of the transfer device (responsible for handling / bonding), the bonding device (responsible for applying optical adhesive 20), and the vacuum fixture (responsible for flattening / fixing the cover plate) achieves integrated and automated operation from loading the curved cover plate 30 → flattening → applying optical adhesive 20 → panel bonding. The core modules of this equipment (vacuum fixture, transfer device) can be designed as a universal platform; by replacing the traction structure or adjusting the vacuum level, it can be compatible with curved display modules of different curvatures and sizes.

[0070] The bonding equipment provided in this embodiment does not rely on traditional airbag contouring or complex curved surface molds. One set of equipment can be used to process curved cover plates from two different sources: hot-bent cover plates (elastically flattened) and cold-bent cover plates (planar structure, requiring only fixing). Regardless of the type of cover plate, as long as it can be flattened into a plane, the hard-to-hard bonding of the optical adhesive 20 and the display panel 10 can be completed under high precision and uniform stress.

[0071] Traditional equipment heavily relies on the curved shape of the cover plate (such as airbag contouring molds), and a single set of equipment typically only supports one curvature or one bonding mode. The core of this equipment is a planar bonding platform. One set of equipment can handle both cold-bent (no flattening required, direct fixing) and hot-bent (flattening required) cover plates, greatly improving the equipment's versatility and utilization. Furthermore, traditional curved surface bonding relies on complex curved molds or flexible airbags, making process debugging difficult. The core of this equipment is flattening / fixing, with subsequent bonding all using mature planar hard-to-hard bonding. This simplifies the process and provides a wider debugging window. Traditional solutions require purchasing multiple sets of equipment for different curvatures, while this disclosed equipment can achieve multiple functions in one set, reducing the need for repeated purchases of specialized curved surface equipment and lowering overall production costs. In addition, traditional solutions rely on external forces to maintain the curved surface shape for bonding, resulting in uneven stress. In this disclosure, regardless of whether the cover plate is cold-bent or hot-bent, the final bonding is completed in a planar state with uniform stress, ensuring stable bonding yield and consistent display quality.

[0072] Please combine Figure 4 and Figure 9 In one optional embodiment of this disclosure, when the cover plate 30 transferred by the transfer device is a curved cover plate 30, the vacuum fixture is also used to shape the curved cover plate 30 into a planar cover plate. For example, the vacuum fixture includes a vacuum adsorption structure 91. When the cover plate 30 is a curved cover plate, i.e., a hot-bent cover plate, the function of the vacuum fixture is to "shape the curved cover plate into a planar cover plate" as mentioned in the foregoing embodiments, performing deformation (flattening) + fixing functions. For example, the curved cover plate can be shaped into a planar cover plate by the adsorption force of the vacuum adsorption structure 91. When the cover plate 30 is a planar cover plate, i.e., a cold-bent cover plate, the vacuum fixture only performs the fixing function. This dynamic functionality ensures the high compatibility and versatility of the equipment. It is precisely because the vacuum fixture has the ability to efficiently and uniformly flatten the curved cover plate into a planar structure that it can provide a high-precision planar reference for subsequent optical adhesive bonding and hard-to-hard bonding of the display panel, thereby ensuring the yield advantages brought by all the manufacturing methods mentioned in the foregoing embodiments.

[0073] Please refer to this appropriately. Figure 9 In one alternative embodiment of this disclosure, the vacuum fixture further includes a traction structure 92 for applying traction force to the cover plate 30 of the curved structure.

[0074] For a cover plate 30 with a very large curvature, pure vacuum adsorption force is often insufficient to efficiently and safely flatten it. A traction structure (whether magnetic or mechanical) provides a controllable and powerful additional pulling force. This force can be concentrated at the farthest end of the cover plate 30 (first part 31), working in conjunction with the adsorption force to quickly overcome the elastic potential energy of the cover plate 30 and pull it to a flat state. In the vacuum fixture, the traction force of the traction structure 92 is responsible for quickly completing the large-stroke pre-deformation of the cover plate 30, while the vacuum adsorption force of the vacuum adsorption structure 91 is responsible for precise and uniform fixation when the cover plate 30 is close to the plane. This relay and synergistic effect of forces greatly shortens the time required for the entire flattening process and improves the production cycle of the equipment. Distributing the total pulling force to both structures avoids the instantaneous stress changes caused by the extremely high vacuum required for pure vacuum adsorption. This makes the stress changes during the flattening process more gradual and controllable, reducing the risk of cover plate damage.

[0075] In one alternative embodiment of this disclosure, the traction structure 92 includes either a mechanical gripper or a magnetic gripper. A mechanical gripper provides strong, stable, and precisely quantifiable physical clamping and tensile forces. For covers with extreme curvature and high deformation difficulty, the tensile force provided by a mechanical gripper is often more reliable than that of a magnetic gripper, ensuring thorough flattening. Introducing a mechanical gripper is suitable for situations where the cover edge structure allows for clamping and a strong and defined tensile force is required. A magnetic gripper enables non-contact force application. This avoids the physical marks, friction, or scratches that may result from mechanical clamping. Furthermore, the force application and release response of a magnetic gripper (typically an electromagnet) is extremely fast, which helps shorten production cycle time, and mechanical reset is not required after the external force is removed. Introducing a magnetic gripper is suitable for situations where the cover edge contains ferromagnetic materials (such as a metal frame) or where magnetic grippers are used to fix the cover edge.

[0076] Based on the same inventive concept, this disclosure also provides a curved display device, manufactured using the method for manufacturing the curved display device in the foregoing embodiments. Figure 14 The diagram shown is a structural schematic of a curved display device 100 provided in an embodiment of this disclosure. Figure 15 The image shown is a top view of a curved display device 100 provided in an embodiment of this disclosure. Please refer to... Figure 14 and Figure 15 The curved display device includes a cover plate 30 with a curved structure and a display panel 10. An optical adhesive 20 is provided on the side of the cover plate 30 facing the display panel 10, and the cover plate 30 is attached to the display panel 10 by the optical adhesive 20. The display panel 10 includes a display area AA. Along the thickness direction of the curved display device, the optical adhesive 20 covers the display area AA, and the edge of the optical adhesive 20 extends beyond the edge of the display area AA.

[0077] Considering that curved display devices have the greatest edge resilience, if the optical adhesive 20 only covers the display area AA, the adhesive layer at the edges is prone to micro-cracks or bubbles due to stress concentration when compressed. By setting the edge of the optical adhesive 20 to extend beyond the display area AA, it ensures that every pixel at the edge of the display area AA is completely enclosed and pressure-buffered by the optical adhesive 20, thus helping to suppress rebound bubbles. Moreover, the optical adhesive 20 extending beyond the display area AA can act as a "stress transition." The extended portion bears the concentrated stress at the bend, making the thickness inside the display area AA more stable. This directly improves the brightness ratio in the black uniformity test and helps eliminate edge yellowing.

[0078] Furthermore, the design of the optical adhesive 20 extending beyond the display area AA provides the necessary tolerance space for the bonding process. Even with minor physical misalignments during bonding, it ensures that the display area AA is completely filled, preventing light leakage or abnormal refraction. When curved display devices are used in automotive environments, where there are drastic high and low temperature changes, the design of the optical adhesive 20 extending beyond the display area AA increases the bonding area between the cover and the panel, better resisting interlayer displacement caused by thermal shock and ensuring long-term display stability.

[0079] It should be noted that in the curved display device mentioned in this disclosure, the display panel may be, for example, a liquid crystal display panel, an organic light-emitting display panel, or an inorganic light-emitting display panel, etc., and this disclosure does not specifically limit it.

[0080] Please continue to refer to this. Figure 14 In one optional embodiment of this disclosure, a first polarizer 40 is attached to the surface of the display panel 10, and the first polarizer 40 at least covers the display area of ​​the display panel 10; the first polarizer 40 is located between the optical adhesive 20 and the display panel 10, the optical adhesive 20 covers the first polarizer 40 and the edge of the optical adhesive 20 extends beyond the edge of the first polarizer 40.

[0081] It should be noted that when the first polarizer is attached to the surface of the display panel, the display panel can be, for example, a liquid crystal display panel or an organic light-emitting display panel, and this disclosure does not specifically limit it.

[0082] In conventional methods, the edge of the optical adhesive 20 must be strictly recessed within the first polarizer 40 to prevent the adhesive from crossing the step difference of the polarizer, thus preventing air bubbles and uneven display. Since this invention completes bonding in a planar state, the optical adhesive 20 first firmly adheres to the cover plate 30, avoiding crossing the step difference during bonding. In the final product form, although the optical adhesive 20 extends beyond the edge of the first polarizer 40, the risk of defects in the bonding process has been completely eliminated. With the edge of the optical adhesive 20 extending beyond the edge of the first polarizer 40, it can cover a larger area of ​​the side between the display panel 10 and the cover plate 30. This not only helps to enhance the overall structural strength of the module (providing a wider bonding edge) but also provides a better foundation for subsequent structural adhesive filling or sealing, thereby enhancing the module's dust and water resistance. The design of this disclosure physically maximizes the size of the optical adhesive 20, ensuring the elimination of uneven display and improving black state uniformity, while improving the structural strength, sealing, and reliability of the module through a larger coverage area of ​​the optical adhesive 20.

[0083] Considering that this disclosure involves flattening the curved cover plate before applying the optical adhesive, and that the surface will subsequently revert to its curved shape, when the optical adhesive extends beyond the edge of the first polarizer, it effectively adds a flexible buffer pad at the step of the polarizer. When the module returns to its curved shape, the optical adhesive can absorb and disperse the concentrated stress at the edge, making the display panel more evenly stressed. This effectively improves the uniformity of black states in the black state uniformity test and solves the problem of yellowing at the edges.

[0084] Figure 16 The diagram shown illustrates the relative positions of some film layers in a curved display device. Figure 17 The diagram shown illustrates another relative positional relationship of some film layers in a curved display device. It should be noted that... Figure 16 and Figure 17 The diagram only illustrates some of the film layers in the curved display device and does not represent all the film layer structures of the curved display device.

[0085] Please refer to Figure 16 and Figure 17 In one optional embodiment of this disclosure, the display panel includes an array layer 50. Along the thickness direction of the curved display device, the array layer 50 is covered with optical adhesive 20, and the edge of the optical adhesive 20 coincides with the edge of the array layer 50 (e.g., ...). Figure 16 Alternatively, the edge of the optical adhesive 20 may be located inside the edge of the array layer 50 (e.g., Figure 17 ). Figure 16 In this embodiment, the edge of the first polarizer 40 and the edge of the optical adhesive 20 are spaced apart by a first distance A1, and the edge of the optical adhesive 20 is flush with the edge of the array layer 50. Figure 17 In the embodiment shown, the edge of the first polarizer 40 and the edge of the optical adhesive 20 have a first interval A1, and the edge of the optical adhesive 20 and the edge of the array layer 50 have a second interval A2.

[0086] Please refer to Figure 16 or Figure 17 When the edge of the optical adhesive 20 is located inside the edge of the array layer 50 or flush with it, it ensures that the optical adhesive 20 is always within the physical support range of the array layer 50. If the optical adhesive 20 extends beyond the array layer 50, during the curved surface pressing process, the excess adhesive will overflow downwards and adhere to the sides or fixture, generating traction stress. By controlling the edge to be inside or overlapping the array layer 50, the optical adhesive 20 can smoothly land on the glass / film surface of the array layer 50 after crossing the polarization step, forming a stable stepped support. This ensures that every point of the display edge has a solid backing, completely solving the edge display abnormalities during curved surface restoration.

[0087] When the edge of the optical adhesive 20 is recessed within the array layer 50, the surface of the array layer 50 provides a smooth extension space for the optical adhesive 20 during vacuum bonding. This structure allows air to escape smoothly along the stepped gaps between the first polarizer 40 and the array layer 50 before the adhesive is fully compacted. If the adhesive is too large and curls, it will block the venting path. This precise recessed design ensures a bubble-free bonding process across different steps.

[0088] When the cover glass is hot-bent, the deformation energy of hot-bent glass is greatest at the edges. The edge of the optical adhesive 20 coincides with or is slightly recessed from the array layer 50, so that the mechanical constraint force of the optical adhesive 20 acts directly on the rigid area of ​​the array layer 50. Since the adhesive layer extends beyond the polarizer, the stress concentration point is transferred from the edge of the polarizer to the edge of the array layer. Due to the high mechanical strength of the array layer 50 itself, this design successfully transforms "display interference stress" into "pure structural support stress".

[0089] Furthermore, structural adhesive or a mounting frame is typically required to fill the sides of C-shaped curved display devices. If the edge of the optical adhesive 20 extends beyond the array layer 50, the overflowing adhesive will contaminate the sides, preventing the structural adhesive from sealing. The limitations of this disclosure ensure the cleanliness of the side space, providing a standard process interface for subsequent waterproof sealing and enhancing the device's dust and water resistance.

[0090] Optionally, in the curved display device provided in this embodiment, the cover plate is a curved hot-bent glass. The cover plate 30 is a curved hot-bent glass with elastic memory. This ensures that after the module recovers its curved shape after the external force is removed, its curvature can accurately match the design requirements, and the internal stress distribution is uniform, thereby ensuring the high display quality of the display module in its final form.

[0091] In one optional embodiment of this disclosure, the radius of curvature of the cover plate is R, where R > 100 mm. For a cover plate with this curvature, optical adhesive is provided to cover the display area and extend outward, ensuring that the optical adhesive is continuous and uniform at the starting point of the curvature where R > 100 mm. This helps to prevent edge refraction anomalies caused by large-angle bending, allowing the image to remain pure even at areas of severe curvature.

[0092] Considering that the smaller the radius of curvature, the greater the occupancy of the cover plate edge on the frame and the greater the tensile force on the structural components, this disclosure involves a design where the edge of the optical adhesive overlaps with or is slightly recessed within the array layer under the condition of R > 100mm. This ensures that even under extreme bending with R close to 100mm, the optical adhesive not only covers the display area but also spans the polarizer and locks itself onto the array layer. This provides sufficient mechanical resistance to prevent the module edge from cracking due to excessive force under narrow frame conditions.

[0093] In one optional embodiment of this disclosure, the thickness of the cover plate 30 is H0, wherein 0.1mm≤H0≤2mm.

[0094] If H0 exceeds 2mm, the glass becomes extremely rigid, and the internal tension generated by forcibly flattening it can easily cause the glass to shatter or develop microcracks during the bonding process. A thickness of 0.1mm-2mm ensures that the glass possesses a certain degree of physical toughness, allowing it to withstand temporary shape changes under the action of a conformal fixture without damage. This thickness, combined with the design of "optical adhesive 20 extending beyond the display area," allows the adhesive layer to achieve a very flat reference surface when flattened, thus achieving "zero-bubble" bonding.

[0095] After bonding, the module will return from a planar state to a curved surface corresponding to its radius of curvature. The thicker the glass, the greater the rebound force. Controlling the thickness to within 2mm can limit the instantaneous mechanical stress during rebound. Due to the moderate thickness, the rebound force is within the tolerance range of the optical adhesive 20. The optical adhesive 20 can act as a "damping layer," smoothly absorbing the kinetic energy of the cover plate 30 as it returns to its shape. If the glass is too thick (>2mm), the rebound force may directly tear the polarizer or pull apart the adhesive layer, resulting in serious display defects (edge ​​delamination). Within the above thickness range, after the hot-bent glass is flattened and then restored, its in-plane stress distribution is relatively easy to compensate for and uniformize through the adhesive force of the optical adhesive 20.

[0096] Furthermore, during the flattening and bonding process, the cover plate 30 can better cooperate with the fixture, pressing the optical adhesive 20 to smoothly wrap around the thickness difference of the polarizer. If the cover plate 30 is too thin (<0.1mm), it will fluctuate drastically with the thickness difference, causing optical distortion at the edge of the display area; if it is too thick, it cannot be pressed down, leaving gaps and air bubbles at the thickness difference. The current thickness range strikes a perfect balance between "support" and "fit".

[0097] When the edge of the optical adhesive 20 coincides with or is slightly recessed from the array layer 50, the thickness range of the cover plate (0.1mm≤H0≤2mm) provides sufficient lateral space, allowing the optical adhesive 20 to still have enough substrate surface for subsequent structural adhesive to adhere after wrapping the polarizer. This achieves the strongest dustproof and waterproof seal without increasing the overall thickness of the module.

[0098] Alternatively, 0.5mm≤H0≤1.5mm, or 0.8mm≤H0≤1.2mm, etc., are not specifically limited in this disclosure.

[0099] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0100] The above description is merely a specific embodiment of this disclosure, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for manufacturing a curved surface display device, characterized in that, include: Apply an external force to the curved cover plate to deform it into a planar cover plate; Optical adhesive is applied to the cover plate of the planar structure; The planar display panel is attached to the side of the cover plate of the planar structure where optical adhesive is provided; Remove the external force on the cover plate, causing the cover plate and display panel to be deformed into a curved structure, forming a curved display device.

2. The method for manufacturing a curved surface display device according to claim 1, characterized in that, Applying an external force to the curved cover plate to deform it into a planar cover plate includes: The curved cover plate is transferred to a vacuum fixture equipped with multiple vacuum adsorption structures. The vacuum fixture is opened, and the vacuum adsorption structure is used to apply an adsorption force to the curved cover plate, so that the curved cover plate is deformed into a planar cover plate.

3. The method for manufacturing a curved surface display device according to claim 2, characterized in that, The curved cover plate includes a first part and a second part. The distance between the first part and the vacuum adsorption structure is greater than the distance between the second part and the vacuum adsorption structure. When the vacuum fixture is turned on, the adsorption force of the vacuum adsorption structure corresponding to the first part is controlled to be greater than the adsorption force of the vacuum adsorption structure corresponding to the second part.

4. The method for manufacturing a curved surface display device according to claim 2, characterized in that, The curved cover plate includes a first part and a second part. The distance between the first part and the vacuum adsorption structure is greater than the distance between the second part and the vacuum adsorption structure. The density of the vacuum adsorption structure corresponding to the first part is greater than the density of the vacuum adsorption structure corresponding to the second part.

5. The method for manufacturing a curved surface display device according to claim 4, characterized in that, When the vacuum fixture is turned on, the adsorption force of the vacuum adsorption structure in different areas is controlled to be the same.

6. The method for manufacturing a curved surface display device according to claim 2, characterized in that, The process of transferring the curved cover plate to a vacuum fixture equipped with multiple vacuum adsorption structures specifically involves using a transfer device to transfer the curved cover plate to the vacuum fixture equipped with multiple vacuum adsorption structures. Before opening the vacuum fixture, the process also includes: applying pressure to the cover plate of the curved structure using a transfer device to reduce the curvature of the cover plate.

7. The method for manufacturing a curved surface display device according to claim 2, characterized in that, The removal of external force on the cover plate, causing the cover plate and display panel to be deformed into a curved structure, includes: closing the vacuum fixture, removing the adsorption force of the vacuum adsorption structure on the cover plate, and causing the cover plate and display panel to be deformed into a curved structure.

8. The method for manufacturing a curved surface display device according to claim 1, characterized in that, Applying an external force to the curved cover plate to deform it into a planar cover plate includes: The curved cover plate is transferred to a vacuum fixture equipped with multiple vacuum adsorption structures. The traction structure of the vacuum fixture applies traction force to the cover plate, and the vacuum adsorption structure applies adsorption force to the curved cover plate, so that the curved cover plate is deformed into a planar cover plate.

9. The method for manufacturing a curved surface display device according to claim 8, characterized in that, The starting moment when the traction structure of the vacuum fixture applies traction force to the cover plate is earlier than the starting moment when the vacuum adsorption structure applies adsorption force to the cover plate of the curved structure.

10. The method for manufacturing a curved surface display device according to claim 8, characterized in that, After transferring the curved cover plate into a vacuum fixture equipped with multiple vacuum adsorption structures, the process further includes: controlling the displacement of the traction structure to the two sides of the cover plate, adjusting the height of the traction structure to match the height of the cover plate, and then using the traction structure to clamp the cover plate.

11. The method for manufacturing a curved display device according to claim 10, characterized in that, The curved cover plate includes a first part and a second part, wherein the distance between the first part and the vacuum adsorption structure is greater than the distance between the second part and the vacuum adsorption structure; the traction structure corresponds at least to the first part; When applying traction force to the cover plate using the traction structure of the vacuum fixture, the traction structure is controlled to apply traction force to at least the first part.

12. The method for manufacturing a curved display device according to claim 11, characterized in that, The traction structure also corresponds to the second part. When the traction structure of the vacuum fixture applies traction force to the cover plate, the traction force of the traction structure corresponding to the first part is controlled to be greater than the traction force of the traction structure corresponding to the second part.

13. The method for manufacturing a curved surface display device according to claim 8, characterized in that, The traction force applied to the cover plate by the traction structure is either magnetic attraction or mechanical force.

14. The method for manufacturing a curved surface display device according to claim 8, characterized in that, The process of transferring the curved cover plate to a vacuum fixture equipped with multiple vacuum adsorption structures specifically involves using a transfer device to transfer the curved cover plate to the vacuum fixture equipped with multiple vacuum adsorption structures. Before opening the vacuum fixture, the process also includes: applying pressure to the cover plate of the curved structure using a transfer device to reduce the curvature of the cover plate.

15. The method for manufacturing a curved surface display device according to claim 8, characterized in that, The removal of the external force on the cover plate, causing the cover plate and display panel to be deformed into a curved structure, includes: moving the traction structure to the initial position and canceling the traction force of the traction structure on the cover plate; closing the vacuum fixture and canceling the adsorption force of the vacuum adsorption structure on the cover plate, causing the cover plate and display panel to be deformed into a curved structure.

16. The method for manufacturing a curved surface display device according to claim 1, characterized in that, Applying an external force to the curved cover plate to deform it into a planar cover plate includes: The cover plate of the curved structure is transferred to a platform with viscoelastic material, so that the curved structure comes into contact with the viscoelastic material. Pressure is applied to the curved cover plate using a pressing machine, causing the curved cover plate to be deformed into a planar structure and fixed by a viscoelastic material.

17. The method for manufacturing a curved display device according to claim 16, characterized in that, The removal of external force on the cover plate, causing the cover plate and display panel to be deformed into a curved structure, includes: removing viscoelastic material on one side of the cover plate, causing the cover plate and display panel to be deformed into a curved structure.

18. The method for manufacturing a curved surface display device according to claim 1, characterized in that, The display panel is a liquid crystal display panel, and a first polarizer is attached to the side of the liquid crystal display panel facing the cover plate; when attaching optical adhesive to the cover plate of the planar structure, the attachment area of ​​the optical adhesive is controlled to be larger than the area of ​​the first polarizer in the display panel.

19. The method for manufacturing a curved surface display device according to claim 1, characterized in that, The display panel is any one of a liquid crystal display panel, an organic light-emitting display panel, or an inorganic light-emitting diode display panel.

20. A bonding device for a curved display device, comprising: The transfer device, the attachment device, and the vacuum fixture, wherein the vacuum fixture includes multiple vacuum adsorption structures; The transfer device is used to transfer the cover plate into a vacuum fixture; Vacuum fixtures are used to fix cover plates of planar structures; The attachment device is used to attach optical adhesive to the cover plate of the planar structure; the transfer device is also used to transfer the display panel over the optical adhesive and fix it to the cover plate of the planar structure.

21. The bonding device for the curved surface display device according to claim 20, characterized in that, When the cover plate transferred by the transfer device is a curved cover plate, the vacuum fixture is also used to transform the curved cover plate into a planar cover plate.

22. The bonding device for the curved surface display device according to claim 21, characterized in that, The vacuum fixture also includes a traction structure for applying traction force to the cover plate of the curved structure.

23. The bonding device for the curved surface display device according to claim 22, characterized in that, The traction structure includes mechanical grippers or magnetic grippers.

24. A curved surface display device, characterized in that, The curved display device is manufactured using the manufacturing method of any one of claims 1 to 19. The curved display device includes a cover plate with a curved structure and a display panel. An optical adhesive is disposed on the side of the cover plate facing the display panel, and the cover plate is bonded to the display panel through the optical adhesive. The display panel includes a display area, and along the thickness direction of the curved display device, the optical adhesive covers the display area, with the edge of the optical adhesive extending beyond the edge of the display area.

25. The curved surface display device according to claim 24, characterized in that, A first polarizer is attached to the surface of the display panel, the first polarizer at least covering the display area of ​​the display panel; the first polarizer is located between the optical adhesive and the display panel, the optical adhesive covers the first polarizer and the edge of the optical adhesive extends beyond the edge of the first polarizer.

26. The curved surface display device according to claim 25, characterized in that, The display panel includes an array layer. Along the thickness direction of the curved display device, the array layer covers the optical adhesive, and the edge of the optical adhesive coincides with the edge of the array layer, or the edge of the optical adhesive is located inside the edge of the array layer.

27. The curved surface display device according to claim 24, characterized in that, The cover plate is made of curved, hot-bent glass.

28. The curved surface display device according to claim 24, characterized in that, The radius of curvature of the cover plate is R, where R > 100 mm.

29. The curved surface display device according to claim 24, characterized in that, The thickness of the cover plate is H0, where 0.1mm ≤ H0 ≤ 2mm.

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