Laminating jig, laminating system and laminating method for display product

Abstract

The invention relates to a laminating jig, a laminating system and a laminating method for a display product. The attaching jig comprises a bearing table, a first limiting structure and a second limiting structure which are arranged in a nested mode are arranged on the bearing table and used for containing the cover plate assembly and the optical adhesive film respectively, and a supporting structure used for supporting the cover plate assembly during attaching is further arranged on the surface of the first limiting structure. Precise positioning is provided for the cover plate assembly and the optical adhesive film through the nested limiting layout, external foreign matter is effectively prevented from entering the attaching area from the periphery, meanwhile, the stability of the cover plate assembly in the attaching process is ensured through the supporting structure, the cover plate assembly is prevented from deviating or being improperly pressed, and the attaching quality is improved. Therefore, smudginess, foreign matter defects and the product reworking rate caused by dust invasion and assembly displacement are remarkably reduced, and the attaching yield and the product quality are improved.

Description

Technical Field

[0001] This application relates to the field of display screen bonding technology, and in particular to bonding fixtures, bonding systems and bonding methods for display products. Background Technology

[0002] With the continuous development of display bonding technology, a variety of bonding fixtures and processes have emerged to improve bonding accuracy and product yield. In the bonding process of cover plate and optical adhesive film (OCA), achieving precise positioning and convenient operation has become a key requirement.

[0003] In related technologies, conventional bonding fixtures often use positioning blocks for positioning, such as setting multiple positioning points on the four sides of the cover plate to achieve initial fixation. In addition, a vacuum adsorption system is often used in conjunction with the bonding process to adsorb the optical adhesive film and prevent it from shifting or bubbling.

[0004] However, the above bonding method and related fixtures have obvious problems: on the one hand, there are large gaps between the positioning blocks, and foreign objects and dust can easily enter the bonding area through the gaps, resulting in contamination of the bonding surface and foreign object defects and dirt defects; on the other hand, during the vacuum adsorption process, the airflow can easily bring dust from the surrounding environment into the bonding area, further aggravating the bonding defect rate and product rework rate. Summary of the Invention

[0005] Therefore, it is necessary to provide a bonding fixture, bonding system, and bonding method for display products to address the problems of foreign object entry, dirt generation, and low yield of existing bonding fixtures.

[0006] A bonding fixture for a display product, the bonding fixture comprising:

[0007] A support platform is provided with a first limiting structure and a second limiting structure. The second limiting structure is disposed within the first limiting structure. The first limiting structure is used to place the cover plate assembly, and the second limiting structure is used to place the optical film.

[0008] A support structure is provided on the surface of the first limiting structure, which is used to support the cover plate assembly when the display product is attached.

[0009] In one embodiment, both the first limiting structure and the second limiting structure are recessed groove structures.

[0010] In one embodiment, avoidance structures are provided at the four corners of both the first limiting structure and the second limiting structure.

[0011] In one embodiment, a vacuum adsorption hole is provided on the surface of the second limiting structure.

[0012] In one embodiment, a vacuum adsorption channel is also provided on the support platform, and the vacuum adsorption channel is located on the side wall of the support platform.

[0013] In one embodiment, the support structure is a spring column.

[0014] In one embodiment, the outer wall of the support platform is provided with handholds on opposite sides, and the handholds are concave grip grooves.

[0015] A bonding system for a display product includes the bonding fixture and a vacuum adsorption system that cooperates with the bonding fixture.

[0016] In one embodiment, the bonding system further includes a bonding device that cooperates with the bonding fixture.

[0017] A method for bonding a display product, comprising using the bonding system described above, the method including the following steps:

[0018] S01. Place the optical film within the second limiting structure;

[0019] S02. Place the cover plate assembly within the first limiting structure;

[0020] S03. Start the vacuum adsorption system to perform vacuum adsorption;

[0021] S04. Start the bonding device to press the cover plate assembly and the optical adhesive film together.

[0022] The aforementioned bonding fixture for display products, through the nested layout of the first and second limiting structures, provides precise positioning and limiting for the cover plate assembly and optical adhesive film, effectively restricting foreign objects from entering the bonding area from all sides. At the same time, the support structure on the surface of the first limiting structure can stably support the cover plate assembly during the bonding process, preventing it from shifting or being improperly pressured. This significantly reduces dirt, foreign object defects, and product rework rate caused by foreign objects, dust intrusion, and component displacement during the bonding process, thereby improving the bonding yield and product quality. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a bonding fixture for a display product provided in an embodiment of this application.

[0024] Figure 2 This is a schematic diagram of the structure of a display product being bonded according to an embodiment of this application.

[0025] Figure 3 This is a schematic diagram of the structure of a display product being bonded according to an embodiment of this application.

[0026] Figure 4 This is a flowchart illustrating a bonding method for a display product according to an embodiment of this application.

[0027] The reference numerals in the detailed embodiments are as follows:

[0028] 100. Fitting fixture; 10. Support platform; 20. Cover plate assembly; 30. Optical adhesive film;

[0029] 11. First limiting structure; 12. Second limiting structure; 13. Vacuum adsorption channel;

[0030] 111. Support structure; 112. Avoidance structure; 121. Vacuum adsorption hole. Detailed Implementation

[0031] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0032] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0033] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0034] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0035] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0036] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0037] See Figure 1 , Figure 1 A schematic diagram of a bonding fixture 100 for a display product according to an embodiment of this application is shown. The bonding fixture 100 provided in this embodiment includes: a support platform 10, on which a first limiting structure 11 and a second limiting structure 12 are disposed. The second limiting structure 12 is disposed within the first limiting structure 11. The first limiting structure 11 is used to place a cover plate assembly 20, and the second limiting structure 12 is used to place an optical adhesive film 30. Furthermore, a support structure 111 is disposed on the surface of the first limiting structure 11 to support the cover plate assembly 20 during the bonding of the display product.

[0038] The nested limiting structure layout of this application greatly improves positioning accuracy. The mating gaps between the first limiting structure 11 and the cover plate assembly 20, and between the second limiting structure 12 and the optical adhesive film 30, are controlled within a very small range, thereby effectively preventing dust and foreign objects from the external environment from entering the critical bonding area. Simultaneously, the support structure 111 disposed on the surface of the first limiting structure 11 provides stable and uniform elastic support for the cover plate assembly 20 during subsequent vacuum adsorption and pressing processes, effectively preventing bonding bubbles, alignment deviations, and other defects caused by uneven pressure or component displacement. This integrated design not only simplifies the operation process but also significantly reduces the risk of contamination and product rework rate during the bonding process, achieving a simultaneous improvement in display bonding yield and overall product quality.

[0039] In one embodiment, both the first limiting structure 11 and the second limiting structure 12 are recessed groove structures. This one-piece molded groove design not only provides a stable and precise accommodating space for the cover plate assembly 20 and the optical adhesive film 30, ensuring that the cover plate assembly 20 will not undergo lateral displacement during subsequent operations, but more importantly, its recessed three-dimensional structure physically forms an effective barrier, greatly reducing the probability of dust and particles from the outside air falling into the critical bonding area. The sidewalls of the groove form a circumferential constraint on the components placed within, ensuring that the cover plate assembly 20 and the optical adhesive film 30 maintain a preset alignment during vacuum adsorption and pressing, avoiding poor bonding caused by misalignment. Simultaneously, this simple and efficient structural design facilitates manufacturing and daily cleaning and maintenance, jointly ensuring high cleanliness and high product yield in the bonding process from both design and process perspectives.

[0040] In one embodiment, avoidance structures 112 are provided at the four corners of both the first limiting structure 11 and the second limiting structure 12. This design solves the problem of interference and scratches that easily occur in right-angle areas when placing and removing the cover plate assembly 20 and the optical adhesive film 30. Operators or automated equipment can use the space provided by the avoidance structures 112 to place and remove components more smoothly and safely, which greatly improves the ease of operation and reduces the risk of damage to components due to mechanical collisions. At the same time, the avoidance structures 112 also play a key role in the subsequent vacuum adsorption stage. They provide an additional channel for the uniform flow of gas, helping to avoid air bubbles remaining in the four corner areas due to poor air extraction, and ensuring that the optical adhesive film 30 and the cover plate can achieve full and uniform adsorption and adhesion.

[0041] In one embodiment, vacuum adsorption holes 121 are provided on the surface of the second limiting structure 12. Multiple vacuum adsorption holes 121 can be provided; this multi-pore synergistic adsorption method effectively avoids the problem of insufficient local adsorption force that may occur with traditional single-point or few adsorption points. Simultaneously, these vacuum adsorption holes 121 can be optimally arranged according to the size and shape of the optical film 30, typically employing a uniformly distributed array layout to ensure the uniformity of adsorption force.

[0042] In one embodiment, a vacuum adsorption channel 13 is also provided on the support platform 10, and the vacuum adsorption channel 13 is located on the side wall of the support platform 10. The vacuum adsorption channel 13 located on the side wall of the support platform 10 serves as the main air intake passage, which can be quickly connected to an external vacuum device; while the multiple vacuum adsorption holes 121 distributed on the surface of the second limiting structure 12 serve as negative pressure output ports, forming a complete closed vacuum circuit with the vacuum adsorption channel 13 on the side wall through the connecting pipes hidden inside the support platform 10. When vacuum adsorption is started, the negative pressure airflow is quickly introduced through the side wall channel and evenly distributed to each adsorption hole through the internal pipes, thereby forming a stable and uniform adsorption force field under the optical adhesive film 30. This synergistic mode not only ensures that the optical adhesive film 30 is quickly and smoothly adsorbed and fixed, completely eliminating displacement and wrinkling, but also avoids the exposure of complex pipes on the working surface of the fixture, ensuring the flatness of the adsorption surface and eliminating the cleaning dead corners and contamination risks caused by external pipes, significantly improving the cleanliness and reliability of the bonding process.

[0043] In one embodiment, the support structure 111 is a spring column. Multiple spring columns can be used; preferably, ten are used in this application. This elastic support design provides a compressible buffer interface between the support platform 10 and the cover plate assembly 20, automatically adapting to cover plate assemblies 20 with different thickness tolerances during the bonding and pressing process, and ensuring uniform pressure distribution. The elastic characteristics of the spring columns generate a progressive rebound force under pressure, providing a stable support reference for the cover plate assembly 20 and effectively absorbing any overpressure or vibration that may occur during subsequent pressing, preventing damage to the cover plate assembly 20 due to localized stress concentration. Simultaneously, the array arrangement of multiple spring columns constitutes a dynamic balance system, ensuring that even with minor unevenness on the surface of the support platform 10, the independent expansion and contraction of each spring column compensates for height differences, ensuring that the cover plate assembly 20 always remains horizontal.

[0044] According to some embodiments of this application, to adapt to the bonding process of hot-melt optical adhesive films, the bonding fixture 100 of this application can integrate a heating function. By embedding uniformly distributed silicone heating films or metal heating sheets within the support stage 10, precise temperature control of the area of ​​the second limiting structure 12 can be achieved. Specifically, a PID temperature control system combined with a temperature sensor can be used to stabilize the working surface temperature within the range of 50-120°C, with a fluctuation accuracy of ±1°C. This structural design can effectively ensure the activation and leveling process of the hot-melt optical adhesive film before bonding, improving the interface bonding quality and yield.

[0045] In one embodiment, the outer wall of the support platform 10 is provided with handholds on opposite sides, and the handholds are concave grips. The concave grips of this application provide operators with a comfortable and stable grip point, which not only greatly improves the ease of operation and safety during the handling and transportation of the bonding fixture 100, effectively preventing the bonding fixture 100 from slipping or being damaged by collision due to unstable hand grip, but also cleverly restricts the operating contact area to the outer wall of the fixture, completely eliminating the risk of contamination that may arise from direct contact between human hands and the internal limiting area of ​​the fixture and the product bonding surface. The structural design of the concave grips ensures the integrity and strength of the overall fixture structure, and also provides a clamping and positioning reference for possible automated handling equipment, achieving a seamless connection between manual and automated operations. This improves production efficiency while ensuring the high cleanliness requirements of the entire bonding process.

[0046] To achieve high precision, long lifespan, and excellent cleanliness in the bonding fixture 100, this application has specifically selected and processed the materials for each component of the fixture. The support platform 10, as the basic structural component of the fixture, is preferably made of lightweight aluminum alloy with good mechanical stability. This type of material not only has high strength and good thermal conductivity, which is beneficial for uniform heat dissipation during vacuum adsorption, but also facilitates the formation of complex limiting structures and vacuum channels through machining. To further improve surface hardness, wear resistance, and corrosion resistance, the surface of the support platform 10 can be hard anodized to form a dense oxide film, effectively preventing metal debris or oxidation shedding during daily use, thereby maintaining the cleanliness of the bonding area.

[0047] For the key limiting structures in the fitting fixture 100, the first limiting structure 11 and the second limiting structure 12 are in direct contact with the cover plate assembly 20 and the optical adhesive film 30. Therefore, higher requirements are placed on the dimensional stability, surface smoothness, and chemical inertness of the materials. In addition to the aluminum alloy solution that is integrally machined with the support platform 10, high-strength engineering plastics such as polyetheretherketone (PEEK) or polycarbonate (PC) can also be selected and manufactured independently through injection molding and then assembled. These materials have low gas release, low moisture absorption, and excellent creep resistance, which can maintain precise dimensional tolerances for a long time and avoid deformation caused by changes in environmental temperature and humidity, thereby ensuring limiting accuracy. At the same time, their surface is smooth and does not easily attract dust. If necessary, the surface energy can be further reduced by coating or spraying a Teflon coating to prevent OCA residue adhesion and facilitate cleaning and maintenance.

[0048] Furthermore, the elastic support structure 111—the spring column—used in the bonding fixture 100 is typically made of stainless steel such as SUS304 or SUS316. These materials possess excellent fatigue resistance, maintaining stable support force during frequent compression cycles and preventing plastic deformation or failure. The surface of the spring column undergoes electrolytic polishing or passivation treatment to eliminate micro-burrs and form a uniform passivation film, improving corrosion resistance and eliminating the risk of particulate matter detachment due to surface roughness. Through the selection of the aforementioned materials and the refined design of the surface treatment, this fixture not only meets the rigidity, elasticity, and durability requirements for high-precision bonding in terms of mechanical properties but also reduces the risk of foreign matter generation and contamination introduction from the material source, thus providing a reliable hardware foundation for high-yield bonding of display products.

[0049] To ensure that the bonding fixture 100 maintains a high level of cleanliness and stable performance during long-term use, it is recommended that this fixture be operated in a cleanroom environment with an environmental class of ISO Class 7 (Class 10,000) or higher. A cleanroom environment effectively controls the concentration of airborne particulate matter, preventing external dust from falling into critical areas of the bonding fixture 100 during the OCA bonding process, thereby reducing foreign object defects caused by environmental factors at the source.

[0050] In daily use, the cleaning and maintenance of the fixture are also particularly important. Before and after each use, it is recommended to use a cleanroom-specific lint-free cloth dampened with a small amount of high-purity isopropanol or deionized water to gently wipe the surface of the fixture, especially the inner walls of the grooves of the first limiting structure 11 and the second limiting structure 12, as well as the area around the vacuum adsorption hole 121, to remove any small particles or adhesive residue that may be attached. Avoid using sharp tools or hard brushes during wiping to prevent scratching the fixture surface and damaging its smoothness. For cleaning the inside of the vacuum adsorption channel 13, clean compressed gas can be used periodically for reverse blowing to remove dust accumulated deep within the channels. When not in use for a long period or during periodic maintenance, the fixture should be stored in a dedicated anti-static cleanroom container or clean cabinet to avoid exposure to dust in the general environment. By operating the fixture in a controlled clean environment and following standardized cleaning and maintenance procedures, the service life of the fixture can be significantly extended, its positioning accuracy and adsorption performance maintained, thus continuously providing a reliable guarantee for high-yield bonding.

[0051] This application also provides a bonding system for display products, including a bonding fixture 100 and a vacuum adsorption system that cooperates with the bonding fixture 100. This bonding system organically combines the bonding fixture 100 and the vacuum adsorption system to create a complete closed bonding environment. The vacuum adsorption system, through adsorption channels integrated within the fixture, can form a uniform and stable negative pressure field below the optical adhesive film 30, ensuring that the film is completely flattened and firmly fixed, thus completely eliminating bonding defects caused by film displacement, wrinkling, or residual air bubbles in traditional operations. This system-level solution not only effectively isolates key contaminants during the bonding process but also ensures the adsorption effect of optical adhesive films 30 of different materials through precise vacuum control, providing ideal pretreatment conditions for subsequent lamination processes.

[0052] In one embodiment, the bonding system further includes a bonding device that cooperates with the bonding fixture 100. By forming a cooperative working system with the bonding fixture 100, the bonding device can accurately identify the pre-positioned cover plate assembly 20 and optical adhesive film 30 in the bonding fixture 100, and perform precise alignment and pressing operations after vacuum adsorption stabilization.

[0053] See Figure 4 This application also provides a bonding method for a display product, which uses a bonding system for bonding, and the bonding method includes the following steps:

[0054] S01. Place the optical film 30 inside the second limiting structure 12;

[0055] S02. Place the cover plate assembly 20 inside the first limiting structure 11;

[0056] S03. Start the vacuum adsorption system to perform vacuum adsorption;

[0057] S04. Start the bonding device to press the cover plate assembly 20 and the optical adhesive film 30 together.

[0058] Specifically, in combination Figure 2 and Figure 3 , Figure 2 and Figure 3 This illustration shows a schematic diagram of the structure of a display product being bonded according to an embodiment of this application. Figure 2 In the middle, the optical adhesive film 30 has been placed within the second limiting structure 12; Figure 3 In the process, the cover plate assembly 20 has been placed within the first limiting structure 11. After the optical adhesive film 30 is placed within the second limiting structure 12 and the cover plate assembly 20 is placed within the first limiting structure 11, the vacuum adsorption system connected to the bonding fixture 100 is activated to vacuum adsorb the optical adhesive film 30. Finally, the bonding device that cooperates with the bonding fixture 100 is activated to press the cover plate assembly 20 and the optical adhesive film 30 together.

[0059] This application's streamlined operation method fully utilizes the limiting characteristics of the bonding fixture 100, ensuring precise positioning of both key components through sequential placement steps. The second limiting structure 12 first provides a stable accommodating space for the optical adhesive film 30, keeping it flat; subsequently, the first limiting structure 11 achieves precise alignment with the optical adhesive film 30 by circumferentially constraining the cover plate assembly 20. The activation of the vacuum adsorption system establishes an ideal bonding environment between the two components, eliminating air bubbles and wrinkles through uniform negative pressure adsorption, thus creating conditions for the final pressing process. The entire process is interconnected, with each step laying the operational foundation for subsequent steps, ultimately achieving a high-efficiency, high-precision, and high-yield bonding effect, significantly improving the bonding quality of display screen products.

[0060] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A bonding fixture for a display product, characterized in that, The fitting fixture includes: A support platform is provided with a first limiting structure and a second limiting structure. The second limiting structure is disposed within the first limiting structure. The first limiting structure is used to place the cover plate assembly, and the second limiting structure is used to place the optical film. A support structure is provided on the surface of the first limiting structure, which is used to support the cover plate assembly when the display product is attached.

2. The bonding fixture for the display product according to claim 1, characterized in that, Both the first limiting structure and the second limiting structure are recessed groove structures.

3. The bonding fixture for the display product according to claim 2, characterized in that, Both the first limiting structure and the second limiting structure have avoidance structures at their four corners.

4. The bonding fixture for the display product according to claim 1, characterized in that, Vacuum adsorption holes are provided on the surface of the second limiting structure.

5. The bonding fixture for the display product according to claim 4, characterized in that, The support platform is also provided with a vacuum adsorption channel, which is located on the side wall of the support platform.

6. The bonding fixture for the display product according to claim 1, characterized in that, The supporting structure is a spring column.

7. The bonding fixture for the display product according to claim 1, characterized in that, The outer wall of the support platform is provided with handholds on opposite sides, and the handholds are concave grip grooves.

8. A bonding system for display products, characterized in that, It includes the bonding fixture as described in any one of claims 1-7, and a vacuum adsorption system that cooperates with the bonding fixture.

9. The bonding system for a display product according to claim 8, characterized in that, The bonding system also includes a bonding device that cooperates with the bonding fixture.

10. A method for bonding a display product, characterized in that, The bonding method, using the bonding system as described in claim 9, comprises the following steps: S01. Place the optical film within the second limiting structure; S02. Place the cover plate assembly within the first limiting structure; S03. Start the vacuum adsorption system to perform vacuum adsorption; S04. Start the bonding device to press the cover plate assembly and the optical adhesive film together.

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