A bonding device and bonding process for a large-size display screen and a touch screen

Abstract

The present invention discloses a bonding device and a bonding process for a large-size display screen and a touch screen. The device includes a base, a mounting frame, a first motor, a lead screw, a guide rod, and a first slider. An assembly plate is provided with an assembly seat, a double-threaded lead screw, and a second slider. A cross bar and a transmission frame are arranged inside the C-shaped frame, and a pressing roller is installed on the inner side of the side plate. The process steps include equipment preparation, placement of the bonding object, preliminary bonding positioning, lateral bonding, and synchronous vibration bonding. For the bonding device and the bonding process of the large-size display screen and the touch screen, the rotation of the lead screw driven by the first motor, the rotation of the second gear driven by the second motor, and the rotation of the turntable and the transmission rod driven by the third motor are successively passed through, so that vibration is synchronized when the pressing roller performs lateral bonding movement, thereby being able to generate an impact force on large air bubbles, further improving the bonding quality, reducing the possibility of residual air bubbles inside the screen after bonding, and the vibrating pressing roller can make the pressure distribution on the surface of the touch screen more uniform.

Description

Technical Field

[0001] The present invention relates to the field of display production applications, and in particular to a bonding device and a bonding process for a large-size display screen and a touch screen. Background Art

[0002] With the development of display technology, as a simple, convenient, and natural human-computer interaction device, display screens have been widely used in various fields such as mobile phones, new energy vehicle navigation systems, industrial control, medical treatment, self-service terminals, etc., greatly facilitating users, especially elderly users, thus bringing a brand-new user experience. In the production of display screens, a bonding device is required to bond the display screen and the touch screen.

[0003] Common bonding devices include a bottom plate, columns, a top plate, a controller, a downward pressing servo cylinder, a lifting cross plate, end side plates, a bonding flat plate, a support table, an opposing pressing mechanism, an end support mechanism, etc. When performing the bonding operation, the downward pressing servo cylinder drives the lifting cross plate and the bonding flat plate to move up and down to achieve the bonding action of the touch screen and the liquid crystal display screen. The opposing pressing mechanism rolls from the middle section of the touch screen to both ends to slowly bond the touch screen and the liquid crystal display screen and discharge air.

[0004] However, in this method, since the pressing roller only performs horizontal pressing, only single-direction rolling is used, resulting in limited paths for air bubble discharge. Large air bubbles are difficult to completely discharge, and small air bubbles may also be trapped between the touch screen and the liquid crystal display screen, thereby reducing the product qualification rate. Moreover, during the rolling bonding, the single-direction pressure causes stress concentration at the screen edge or certain local areas, increasing the risk of the touch screen cracking or the liquid crystal layer of the liquid crystal display screen being damaged, reducing the product yield rate, and not meeting the working requirements of display screen production. Therefore, a bonding device and a bonding process for a large-size display screen and a touch screen are proposed. Summary of the Invention

[0005] The present invention provides the following technical solution: A bonding device for a large-size display screen and a touch screen, including a base, both the front and rear sides of the base are connected with mounting frames, and the interiors of the mounting frames are all hollow structures. The top of the rear mounting frame is installed with a first motor through a support, and the rotor of the first motor penetrates through the interior of the mounting frame. The bottom end of the rotor of the first motor is coaxially connected with a lead screw. A guide rod is inserted into the interior of the front mounting frame. First sliders are sleeved on the outer parts of the lead screw and the guide rod.

[0006] The assembly plate is connected to the inner side of the first slider. In the middle of the upper surface of the assembly plate, an assembly seat is installed, and the inside of the assembly seat is a hollow structure. A double-threaded lead screw is inserted into the inside of the assembly seat through a bearing. On both outer sides of the double-threaded lead screw, second sliders are screwed. The left end of the double-threaded lead screw penetrates through the corresponding position of the assembly seat, and the left end of the double-threaded lead screw is coaxially connected with a first gear. At the position behind the assembly seat on the upper part of the assembly plate, a second motor is installed. The rotor of the second motor is coaxially connected with a second gear. Through grooves are opened at the bottom of the assembly seat and in the middle position inside the assembly plate;

[0007] The connecting frame is installed at the bottom of the second slider. The bottom of the connecting frame is connected with a U-shaped frame. On the outer side of the U-shaped frame, a third motor is installed through a tripod. The rotor of the third motor penetrates through the corresponding position inside the U-shaped frame. Cross bars are inserted into the inside of the U-shaped frame, and the inner ends of the cross bars are all connected with transmission frames;

[0008] The turntable is coaxially connected to the outer end of the rotor of the third motor. Transmission rods are connected to both the inner and outer sides of the turntable, and the transmission rods are inserted into the inside of the transmission frames. The outer ends of the cross bars are all connected with side plates, and pressure rollers are installed on the inner sides of the side plates.

[0009] The present invention provides a bonding process for large-size display screens and touch screens according to the bonding device for large-size display screens and touch screens, including the following steps:

[0010] S1 Equipment preparation: Use the above-mentioned bonding device for large-size display screens and touch screens, where the first motor, the second motor, and the third motor are in a standby state for startup, the assembly plate is in the initial position, and the pressure roller is in the initial state;

[0011] S2 Placement of the bonding object: Place the touch screen and the liquid crystal display screen to be bonded on the bonding working area on the surface of the base, which area is located below the pressure roller and can be contacted by the pressure roller;

[0012] S3 Preliminary positioning of bonding: First, apply glue to the surface of the screen through a glue dispenser, and then start the first motor to make the rotor of the first motor drive the lead screw to rotate. Due to the screwing relationship between the lead screw and the first slider and the guiding effect of the guiding rod on the first slider, the first slider drives the assembly plate to move downward until the pressure roller installed at the lower part of the assembly plate reaches a predetermined position close to the surfaces of the touch screen and the liquid crystal display screen;

[0013] In the S4 horizontal laminating process, the second motor is started, and the rotor of the second motor drives the second gear to rotate. Since the first gear meshes with the second gear, the first gear drives the double-threaded lead screw to rotate. The mutually reverse threads on both sides of the outer part of the double-threaded lead screw cause the second sliders on both sides to move synchronously relatively or away from each other. The connecting frame at the bottom of the second slider drives the pressure roller on the lower side of the C-shaped frame to perform a laminating action from one side of the touch screen and the liquid crystal display screen to the other side.

[0014] In the S5 synchronous vibration laminating process, while the horizontal laminating process is in progress, the third motor is started, and the rotor of the third motor drives the turntable to rotate. The transmission rod on the turntable drives the transmission frame to perform a left-right reciprocating motion during the rotation process. The transmission frame drives the side plate and the pressure roller inside the side plate to vibrate synchronously during the horizontal laminating motion. Through the vibration of the pressure roller, the bubbles in the laminating process are processed, the pressure distribution is optimized, the glue distribution is adjusted, and the stress distribution is improved.

[0015] Preferably, the inner cavities of the mounting frame and the assembly seat and the shapes of the first slider and the second slider are all trapezoidal. The threads on both sides of the outer part of the double-threaded lead screw are both set to be mutually reverse, and the first gear meshes with the second gear.

[0016] Preferably, the lengths of the cross bars are all greater than the length of the C-shaped frame. Flexible scrapers are installed on the inner sides of the pressure rollers. The bottom ends of the flexible scrapers are flush with the bottom tangent points of the pressure rollers, and the bottom ends of the flexible scrapers are all provided with rounded corners.

[0017] Preferably, mounting columns are connected to the four corners of the lower surface of the assembly plate. The interiors of the mounting columns are all hollow structures. Springs are connected to the tops of the inner cavities of the mounting columns. Discs are connected to the bottom ends of the springs. Connecting rods are coaxially installed on the lower surfaces of the discs, and the connecting rods all penetrate through the bottoms of the mounting columns. Sealing edge pressing plates are connected to the bottom ends of the connecting rods.

[0018] Preferably, the sealing edge pressing plates are set in a horizontal L shape. The bottom end faces of the connecting rods all extend beyond the lower cutting surfaces of the pressure rollers. Rubber pads are laid on the bottoms of the sealing edge pressing plates.

[0019] Preferably, in step S1, pre-detection is performed on the first motor, the second motor, and the third motor. This pre-detection includes checking whether the circuit connections of the motors are normal. By using a professional circuit detection instrument, it is detected whether there are short circuits, open circuits, etc. in the power supply lines and control lines of the motors. At the same time, the rotors of the motors are checked to see whether the rotors can rotate flexibly and whether there is any jamming phenomenon, so as to avoid the phenomenon of lamination failure caused by the jamming of the rotor during lamination.

[0020] Preferably, in step S2, before placing the touch screen and the liquid crystal display screen, it is necessary to clean the touch screen and the liquid crystal display screen with a cleaning reagent and a lint-free cloth to remove dust and oil stains on the surface, so as to avoid impurities being sandwiched between the touch screen and the liquid crystal display screen during the lamination process, forming defects and affecting the display effect or touch function.

[0021] Preferably, in step S3, the determination of the predetermined position needs to be calculated and adjusted according to the thickness and hardness of the touch screen and the liquid crystal display screen, so as to avoid excessive pressure on the surfaces of the touch screen and the liquid crystal display screen by the pressure roller.

[0022] Preferably, in step S4, at the beginning stage of lamination, since the initial contact state between the touch screen and the liquid crystal display screen may be unstable, the initial movement speed of the second slider starts from zero and increases slowly to ensure that there is enough time for the pressure roller to make good initial contact with the screen surface, reducing the generation of bubbles or poor lamination during the initial lamination. As the lamination progresses and after confirming that the lamination state is stable, the movement speed is gradually increased.

[0023] In summary, compared with the prior art, the present invention provides a lamination device and a lamination process for a large-size display screen and a touch screen, having the following beneficial effects:

[0024] 1. The lamination device for the large-size display screen and the touch screen in this solution realizes precise control and vibration lamination of the pressure roller through the coordinated work of the first motor, the second motor, and the third motor. It can effectively process the bubbles during the lamination process, optimize the pressure distribution, adjust the glue distribution, and improve the stress distribution, thereby greatly improving the lamination quality and reducing the possibility of residual bubbles inside the screen after lamination. The vibrating pressure roller makes the pressure distribution on the surface of the touch screen more uniform, which helps the uniform distribution of the glue, improves the bonding effect of the glue, and makes the bonding between the touch screen and the liquid crystal display screen more firm and stable. It not only improves the qualification rate of the product but also enhances the durability and reliability of the product.

[0025] 2. The lamination device for the large-size display screen and the touch screen in this solution can change the distribution direction of the stress by the vibration of the pressure roller, making the stress more dispersed and reducing the risk of material damage caused by stress concentration, such as the breakage of the touch screen or the damage of the liquid crystal layer of the liquid crystal display screen. It helps to improve the yield rate of the product and reduce the production cost. The additional edge-sealing pressing plate can provide stable support for both ends of the display screen when the pressure roller touches the display screen, preventing bubbles from being generated due to the rapid rebound of the ends of the display screen, enhancing the stability of the lamination process, and improving the finished product rate.

[0026] 3. The bonding process of the large-size display screen and the touch screen in this solution avoids bonding failures caused by equipment malfunctions through pre-inspection of the motor and overall inspection of the equipment, improving production efficiency. The cleaning treatment before bonding further enhances the bonding accuracy and the finished product rate. The screen surface is dispensed with glue by a dispenser, providing a necessary glue layer for bonding and ensuring the firmness of the bond. The first motor drives the lead screw to rotate, precisely adjusting the position of the pressure roller and avoiding errors and damages during the bonding process;

[0027] 4. In the bonding process of the large-size display screen and the touch screen in this solution, the second motor drives the double-threaded lead screw to rotate, realizing the synchronous relative or opposite movement of the pressure rollers on both sides, ensuring the smoothness and continuity of the bonding process. This not only improves the bonding efficiency but also reduces quality problems caused by uneven bonding. While performing horizontal bonding, the third motor drives the turntable and the transmission rod to rotate, realizing the synchronous vibration of the pressure roller, which can effectively handle the bubbles during the bonding process, optimize the pressure distribution and glue distribution, improve the stress distribution, further enhance the bonding quality, reduce the possibility of residual bubbles inside the screen after bonding, and make the bond between the touch screen and the liquid crystal display screen more firm and stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic diagram of the overall structure of the present invention.

[0029] Figure 2 is a schematic cross-sectional view of the mounting bracket of the present invention.

[0030] Figure 3 is a schematic diagram of the assembly plate of the present invention.

[0031] Figure 4 is a schematic cross-sectional view of the assembly plate of the present invention.

[0032] Figure 5 is a schematic diagram of the second slider and the connecting frame of the present invention.

[0033] Figure 6 is a schematic diagram of the C-shaped frame and the cross bar of the present invention.

[0034] Figure 7 is a schematic cross-sectional view of the mounting column of the present invention.

[0035] Figure 8 is a process flow chart of the bonding process of the large-size display screen and the touch screen of the present invention.

[0036] Description of the Reference Numerals:

[0037] 1. Base; 2. Mounting frame; 3. First motor; 4. Lead screw; 5. Guide rod; 6. First slider; 7. Assembly plate; 8. Through groove; 9. Assembly seat; 10. Double-threaded lead screw; 11. First gear; 12. Second motor; 13. Second gear; 14. Second slider; 15. Mounting column; 16. Connecting frame; 17. C-shaped frame; 18. Third motor; 19. Turntable; 20. Cross bar; 21. Transmission rod; 22. Side plate; 23. Pressing roller; 24. Transmission frame; 25. Flexible scraper; 26. Spring; 27. Disc; 28. Connecting rod; 29. Edge-sealing pressing plate. Detailed implementation manners

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] The present invention provides a technical solution, a bonding device for a large-size display screen and a touch screen, including a base 1, a mounting frame 2, a first motor 3, a lead screw 4, a guide rod 5, a first slider 6, an assembly plate 7, a through groove 8, an assembly seat 9, a double-threaded lead screw 10, a first gear 11, a second motor 12, a second gear 13, a second slider 14, a mounting column 15, a connecting frame 16, a C-shaped frame 17, a third motor 18, a turntable 19, a cross bar 20, a transmission rod 21, a side plate 22, a pressing roller 23, a transmission frame 24, a flexible scraper 25, a spring 26, a disc 27, a connecting rod 28 and an edge-sealing pressing plate 29:

[0040] Please refer to Figure 1 , both the front and rear sides of the base 1 are connected with a mounting frame 2, and the inside of the mounting frame 2 is a hollow structure. The top of the rear mounting frame 2 is installed with a first motor 3 through a tripod, and the rotor of the first motor 3 penetrates through the inside of the mounting frame 2. Please refer to Figure 2 , the bottom end of the rotor of the first motor 3 is coaxially connected with a lead screw 4, and a guide rod 5 is inserted into the inside of the front mounting frame 2. The outside of the lead screw 4 and the guide rod 5 are both sleeved with a first slider 6;

[0041] The assembly plate 7 is connected to the inner side of the first slider 6. Please refer to Figure 3 and Figure 4, a mounting seat 9 is installed in the middle of the upper surface of the mounting plate 7, and the interior of the mounting seat 9 is a hollow structure. A double-threaded lead screw 10 is inserted into the interior of the mounting seat 9 through a bearing. On both outer sides of the double-threaded lead screw 10, second sliders 14 are screwed. The left end of the double-threaded lead screw 10 penetrates through the corresponding position of the mounting seat 9, and the left end of the double-threaded lead screw 10 is coaxially connected to a first gear 11. At the position behind the mounting seat 9 on the upper part of the mounting plate 7, a second motor 12 is installed. The rotor of the second motor 12 is coaxially connected to a second gear 13. Through grooves 8 are opened at the bottom of the mounting seat 9 and in the middle of the interior of the mounting plate 7. The inner cavities of the mounting frame 2 and the mounting seat 9 and the shapes of the first slider 6 and the second slider 14 are all trapezoidal. The threads on both outer sides of the double-threaded lead screw 10 are set in opposite directions. The first gear 11 meshes with the second gear 13;

[0042] Please refer to Figure 5 and Figure 6 , a connecting frame 16 is installed at the bottom of the second slider 14. The bottom of the connecting frame 16 is connected to a C-shaped frame 17. A third motor 18 is installed on the outer side of the C-shaped frame 17 through a footrest. The rotor of the third motor 18 penetrates through the corresponding position inside the C-shaped frame 17. Cross bars 20 are inserted into the interior of the C-shaped frame 17. The inner ends of the cross bars 20 are all connected to a transmission frame 24;

[0043] , a turntable 19 is coaxially connected to the outer end of the rotor of the third motor 18. Transmission rods 21 are connected to both the inner and outer sides of the turntable 19, and the transmission rods 21 are inserted into the interior of the transmission frame 24. The outer ends of the cross bars 20 are all connected to side plates 22. Pressure rollers 23 are installed on the inner sides of the side plates 22. The lengths of the cross bars 20 are all greater than the length of the C-shaped frame 17. Flexible scraping plates 25 are installed on the inner sides of the pressure rollers 23. The bottom ends of the flexible scraping plates 25 are flush with the bottom tangent points of the pressure rollers 23. The bottom ends of the flexible scraping plates 25 are all provided with rounded corners;

[0044] Please refer to Figure 4 , mounting columns 15 are connected to the four corners of the lower surface of the mounting plate 7. Please refer to Figure 7 , the interiors of the mounting columns 15 are all hollow structures. Springs 26 are connected to the tops of the inner cavities of the mounting columns 15. The bottom ends of the springs 26 are all connected to discs 27. Connecting rods 28 are coaxially installed on the lower surfaces of the discs 27, and the connecting rods 28 all penetrate through the bottoms of the mounting columns 15. The bottom ends of the connecting rods 28 are all connected to edge-sealing pressing plates 29. The edge-sealing pressing plates 29 are in a horizontal L-shaped setting. The bottom end faces of the connecting rods 28 all extend beyond the lower cutting surfaces of the pressure rollers 23. Rubber pads are laid on the bottoms of the edge-sealing pressing plates 29.

[0045] Please refer to Figure 7 , the bonding process of the large-size display screen and the touch screen of the present invention includes the following steps;

[0046] S1 Equipment preparation

[0047] Using the laminating device for large-size display screens and touch screens described above, where the first motor 3, the second motor 12, and the third motor 18 are in a state to be started, the assembly plate 7 is in the initial position, and the pressure roller 23 is in the initial state. When pre-detecting the first motor 3, the second motor 12, and the third motor 18, it includes checking whether the circuit connections of the motors are normal. By using a professional circuit detection instrument, check whether there are short circuits, open circuits, etc. in the power supply lines and control lines of the motors. At the same time, check the rotors of the motors to see whether the rotors can rotate flexibly and whether there is any jamming phenomenon, so as to avoid the phenomenon of lamination failure caused by the jamming of the rotors during lamination;

[0048] S2 Placement of the objects to be laminated

[0049] Place the touch screen and the liquid crystal display screen to be laminated on the lamination working area on the surface of the base. This area is located below the pressure roller 23 and can be contacted by the pressure roller 23. Before placing the touch screen and the liquid crystal display screen, it is necessary to clean the touch screen and the liquid crystal display screen with a cleaning reagent and a dust-free cloth to remove dust and oil stains on the surface, so as to avoid problems that impurities are sandwiched between the touch screen and the liquid crystal display screen during lamination, forming defects and affecting the display effect or touch function;

[0050] S3 Preliminary positioning of lamination

[0051] First, apply glue to the surface of the screen through a glue dispenser, and then start the first motor 3. The rotor of the first motor 3 drives the lead screw 4 to rotate. Due to the screw connection between the lead screw 4 and the first slider 6 and the guiding action of the guiding rod 5 on the first slider 6, the first slider 6 drives the assembly plate 7 to move downward until the pressure roller 23 installed at the lower part of the assembly plate 7 reaches a predetermined position close to the surfaces of the touch screen and the liquid crystal display screen. This predetermined position needs to be calculated and adjusted according to the thickness and hardness of the touch screen and the liquid crystal display screen to avoid excessive pressure on the surfaces of the touch screen and the liquid crystal display screen by the pressure roller 23;

[0052] S4 Horizontal lamination process

[0053] Start the second motor 12. The rotor of the second motor 12 drives the second gear 13 to rotate. Since the first gear 11 meshes with the second gear 13, the first gear 11 drives the double-threaded lead screw 10 to rotate. The threads on both sides of the outside of the double-threaded lead screw 10 are opposite to each other, causing the second sliders 14 on both sides to move synchronously relative to or away from each other. The connecting frame 16 at the bottom of the second slider 14 drives the pressure roller 23 on the lower side of the U-shaped frame 17 to perform a fitting action from one side of the touch screen and the liquid crystal display screen to the other side. At the beginning stage of the fitting, since the initial contact state between the touch screen and the liquid crystal display screen may be unstable, the initial moving speed of the second slider 14 slowly increases from zero to ensure that there is enough time for the pressure roller 23 to make good initial contact with the screen surface, reducing the generation of bubbles or loose fitting during the initial fitting. As the fitting progresses and after confirming that the fitting state is stable, the moving speed is gradually increased;

[0054] S5 Synchronous vibration fitting process

[0055] During the horizontal fitting process, start the third motor 18. The rotor of the third motor 18 drives the turntable 19 to rotate. The transmission rod 21 on the turntable 19 drives the transmission frame 24 to perform a left-right reciprocating motion during rotation. The transmission frame 24 drives the side plate 22 and the pressure roller 23 inside the side plate 22 to vibrate synchronously during the horizontal fitting motion through the cross bar 20. The vibration of the pressure roller 23 is used to handle the bubbles during the fitting process, optimize the pressure distribution, adjust the glue distribution, and improve the stress distribution.

[0056] In this solution, the first motor 3 drives the rotation of the lead screw 4, thereby driving the up and down movement of the first slider 6 and the assembly plate 7, enabling the pressure roller 23 to press on the surfaces of the touch screen and the liquid crystal display screen. Then, the second motor 12 drives the rotation of the second gear 13, enabling the rotation of the double-threaded lead screw 10 to be driven through the first gear 11, and further synchronously driving the movement of the second slider 14, causing the pressure roller 23 to perform the fitting action on the touch screen and the liquid crystal display screen. At the same time, the third motor 18 drives the rotation of the turntable 19 and the transmission rod 21, driving the left and right reciprocating movement of the transmission frame 24 and the cross bar 20, causing vibration during the horizontal fitting movement of the pressure roller 23, thereby being able to generate an impact force on large air bubbles and break them into smaller bubbles, and the smaller bubbles are more easily discharged along with the rolling and vibration of the pressure roller 23, further improving the fitting quality and reducing the possibility of residual bubbles inside the screen after fitting. Moreover, the vibrating pressure roller 23 can make the pressure distribution on the surface of the touch screen more uniform, and at the same time, the vibration of the pressure roller 23 helps the glue to be evenly distributed. Vibration can make the glue flow better in tiny gaps, avoiding local accumulation of glue or areas where the glue is not covered, which is beneficial to improving the bonding effect of the glue, making the bonding between the touch screen and the liquid crystal display screen more firm and stable, and improving the qualified rate of the product. Secondly, the vibration of the pressure roller 23 can change the distribution direction of stress, making the stress more dispersed, and can reduce the risk of material damage caused by stress concentration, such as the rupture of the touch screen or damage to the liquid crystal layer of the liquid crystal display screen, improving the yield rate of the product. And the vibrating fitting helps the material to better adapt to the pressure change during the fitting process, making the performance of the fitted screen more stable during subsequent use.

[0057] At the same time, when the assembly plate 7 drives the pressure roller 23 to move downward and contact the display screen, the added edge-sealing pressure plate 29 in this solution can make the edge-sealing pressure plate 29 press on both ends of the display screen, which can not only provide stable support for both ends of the display screen, but also prevent air bubbles from being generated due to the rapid rebound of the ends of the display screen, improving the stability and finished product rate of the fitting process.

[0058] The fitting device and its fitting process for large-size display screens and touch screens of the present invention bring significant beneficial effects, mainly including the following points:

[0059] Improved fitting quality: Through the coordinated operation of the first motor 3, the second motor 12, and the third motor 18, precise control and vibrating fitting of the pressure roller 23 are achieved. This design can effectively handle air bubbles during the fitting process, optimize the pressure distribution, adjust the glue distribution, and improve the stress distribution, thereby significantly improving the fitting quality and reducing the possibility of residual bubbles inside the screen after fitting.

[0060] Improved product qualification rate: The vibrating pressure roller 23 makes the pressure distribution on the surface of the touch screen more uniform, which helps the glue to be evenly distributed, improves the bonding effect of the glue, and makes the bonding between the touch screen and the liquid crystal display more firm and stable. This not only improves the product qualification rate but also enhances the durability and reliability of the product.

[0061] Reduced risk of material damage: The vibration of the pressure roller 23 can change the direction of stress distribution, making the stress more dispersed and reducing the risk of material damage caused by stress concentration, such as the cracking of the touch screen or damage to the liquid crystal layer of the liquid crystal display. This helps to improve the yield rate of the product and reduce production costs.

[0062] Enhanced stability during the bonding process: The additional edge-sealing pressing plate 29 can provide stable support for both ends of the display screen when the pressure roller 23 touches the display screen, preventing air bubbles from being generated due to the rapid rebound of the ends of the display screen. This enhances the stability of the bonding process and improves the finished product rate.

[0063] Greater adaptability: The device and process can be adjusted according to the thickness and hardness of the touch screen and the liquid crystal display to adapt to different specifications and types of display screens, with wide applicability.

[0064] Easier operation: Through motor drive and automated control, the bonding process is simplified, reducing the complexity and difficulty of manual operation and improving production efficiency.

[0065] The beneficial effects of the process steps of this solution include:

[0066] Equipment preparation stage:

[0067] Pre-detection of the motor: By pre-detecting the circuit connection and rotor flexibility of the motor, the stable operation of the motor during the bonding process is ensured, avoiding bonding failures caused by motor faults and improving production efficiency.

[0068] Ready state: Place the motor in the standby state, making full preparations for the subsequent bonding process.

[0069] Placement stage of the bonding object:

[0070] Cleaning treatment: Use cleaning reagents and lint-free cloth to clean the touch screen and the liquid crystal display, effectively removing dust and oil stains on the surface, avoiding the influence of impurities on the bonding quality, and improving the bonding accuracy and finished product rate.

[0071] Positioning placement: Place the display screen to be bonded in the bonding working area on the surface of the base 1, ensuring the accuracy and effectiveness of the bonding.

[0072] Initial positioning stage of the bonding:

[0073] Dispensing: The screen surface is dispensed through a dispenser, providing the necessary glue for the bonding process and ensuring a firm bond between the touch screen and the liquid crystal display.

[0074] Adjusting the position of the pressure roller 23: By starting the first motor 3, the position of the pressure roller 23 is precisely adjusted to approach and contact the surfaces of the touch screen and the liquid crystal display, avoiding damage to the screen surface caused by excessive pressure and ensuring the uniformity and stability of the bonding.

[0075] Horizontal bonding process:

[0076] Synchronous movement: By starting the second motor 12, the double-threaded lead screw 10 is driven to rotate, achieving the synchronous relative or opposite movement of the pressure rollers 23 on both sides and ensuring the smoothness and continuity of the bonding process.

[0077] Initial speed control: At the beginning of the bonding process, by controlling the movement speed of the second slider 14 to slowly increase from zero, it ensures that there is enough time for the pressure roller 23 to make a good initial bond with the screen surface, reducing the occurrence of bubbles or loose bonding during the initial bonding.

[0078] Synchronous vibration bonding process:

[0079] Vibration treatment: By starting the third motor 18, the turntable 19 and the transmission rod 21 are driven to rotate, achieving the synchronous vibration of the pressure roller 23 during the horizontal bonding process. This vibration can effectively process the bubbles during the bonding process, optimize the pressure distribution, adjust the glue distribution, and improve the stress distribution.

[0080] Improving the bonding quality: The vibrating pressure roller 23 can further improve the bonding quality, reduce the possibility of residual bubbles inside the screen after bonding, and make the bond between the touch screen and the liquid crystal display more firm and stable.

[0081] Each step of this solution aims to improve the accuracy, stability, and quality of the bonding. Through strict equipment preparation, cleaning treatment, preliminary positioning, horizontal bonding, and synchronous vibration bonding and other steps, it ensures the high efficiency, stability, and reliability of the display production bonding process. Specifically, for the bonding of large-size displays and touch screens in the prior art, for example, after injecting glue for a 1.27-inch product, it needs to stand for about 30 minutes, resulting in a decrease in production efficiency. However, through the strict equipment preparation, cleaning treatment, preliminary positioning, horizontal bonding, and synchronous vibration bonding and other steps of this application, after injecting glue for a 1.27-inch product, it only takes 15 minutes to meet the required production requirements, thus ensuring the high efficiency, stability, and reliability of the display production bonding process.

[0082] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or apparatus comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or apparatus.

[0083] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bonding device for a large-size display screen and a touch screen, characterized in that: Including: A base (1), mounting brackets (2) are connected to both the front and rear sides of the base (1), and the interiors of the mounting brackets (2) are all hollow structures. A first motor (3) is mounted on the top of the rear mounting bracket (2) through a tripod, and the rotor of the first motor (3) penetrates through the interior of the mounting bracket (2). The bottom end of the rotor of the first motor (3) is coaxially connected to a lead screw (4). A guide rod (5) is inserted into the interior of the front mounting bracket (2). First sliders (6) are sleeved on the outer sides of the lead screw (4) and the guide rod (5); An assembly plate (7) is connected to the inner sides of the first sliders (6). A mounting seat (9) is mounted in the middle of the upper surface of the assembly plate (7), and the interior of the mounting seat (9) is a hollow structure. A double-threaded lead screw (10) is inserted into the interior of the mounting seat (9) through a bearing. Second sliders (14) are screwed on both outer sides of the double-threaded lead screw (10). The left end of the double-threaded lead screw (10) penetrates through the corresponding position of the mounting seat (9), and the left end of the double-threaded lead screw (10) is coaxially connected to a first gear (11). A second motor (12) is mounted at the position behind the mounting seat (9) on the upper part of the assembly plate (7). The rotor of the second motor (12) is coaxially connected to a second gear (13). Through grooves (8) are formed at the bottom of the mounting seat (9) and in the middle of the interior of the assembly plate (7); A connecting frame (16) is mounted at the bottom of the second slider (14). A C-shaped frame (17) is connected to the bottom of the connecting frame (16). A third motor (18) is mounted on the outer side of the C-shaped frame (17) through a tripod. The rotor of the third motor (18) penetrates through the corresponding position in the interior of the C-shaped frame (17). Cross bars (20) are inserted into the interiors of the C-shaped frames (17). Transmission frames (24) are connected to the inner ends of the cross bars (20); A turntable (19) is coaxially connected to the outer end of the rotor of the third motor (18). Transmission rods (21) are connected to both the inner and outer sides of the turntable (19), and the transmission rods (21) are inserted into the interiors of the transmission frames (24). Side plates (22) are connected to the outer ends of the cross bars (20). Pressing rollers (23) are mounted on the inner sides of the side plates (22); The inner cavities of the mounting brackets (2) and the mounting seats (9) and the shapes of the first sliders (6) and the second sliders (14) are all trapezoidal. The threads on both outer sides of the double-threaded lead screw (10) are set in opposite directions. The first gear (11) meshes with the second gear (13).

2. The bonding device for a large-size display screen and a touch screen according to claim 1, characterized in that: The lengths of the cross bars (20) are all greater than the length of the C-shaped frame (17). Flexible scraping plates (25) are mounted on the inner sides of the pressing rollers (23). The bottom ends of the flexible scraping plates (25) are flush with the bottom tangent points of the pressing rollers (23). The bottom ends of the flexible scraping plates (25) are provided with rounded corners.

3. The laminating device for a large-size display screen and a touch screen according to claim 2, characterized in that: The four corners of the lower surface of the assembly plate (7) are connected to mounting columns (15), the interior of the mounting columns (15) is a hollow structure, the top of the inner cavity of the mounting columns (15) is connected to a spring (26), the bottom end of the spring (26) is connected to a disc (27), the lower surface of the disc (27) is coaxially mounted with a connecting rod (28), and the connecting rod (28) passes through the bottom of the mounting column (15), and the bottom end of the connecting rod (28) is connected to an edge sealing pressure plate (29).

4. The laminating device for a large-size display screen and a touch screen according to claim 3, characterized in that: The edge sealing pressing plate (29) is in a transverse L-shape, the bottom end surfaces of the connecting rods (28) are all beyond the lower section of the pressing roller (23), and the bottom of the edge sealing pressing plate (29) is paved with a rubber pad.

5. A laminating process for a large-size display screen and a touch screen, applied to a laminating device for a large-size display screen and a touch screen as claimed in any one of claims 1 to 4, characterized in that: The following steps are involved: S1: equipment preparation, wherein the first motor (3), the second motor (12) and the third motor (18) are in a ready-to-start state, the assembly plate (7) is in an initial position, and the pressure roller (23) is in an initial state; S2: placing the laminating object, placing the touch screen and the liquid crystal display screen to be laminated on a laminating working area on the surface of the base, the area being located below the pressing roller (23) and being able to be contacted by the pressing roller (23); S3 preliminary positioning of lamination, firstly, glue is dispensed on the screen surface by a glue dispenser, then the first motor (3) is started, so that the rotor of the first motor (3) drives the lead screw (4) to rotate, and due to the rotational connection between the lead screw (4) and the first slider (6) and the guiding effect of the guide rod (5) on the first slider (6), the first slider (6) drives the assembly plate (7) to move downward until the pressure roller (23) installed at the bottom of the assembly plate (7) reaches a predetermined position close to the touch screen and the surface of the liquid crystal display screen; S4 is a lateral bonding process, in which the second motor (12) is started, and the rotor of the second motor (12) drives the second gear (13) to rotate. Since the first gear (11) is meshed with the second gear (13), the first gear (11) drives the double-threaded screw (10) to rotate. The threads on both sides of the double-threaded screw (10) are in opposite directions, so that the second sliders (14) on both sides move synchronously relative to or opposite to each other. The connecting frame (16) at the bottom of the second slider (14) drives the pressure roller (23) on the lower side of the shaped frame (17) to perform bonding from one side of the touch screen and the liquid crystal display screen to the other side. S5 is a synchronous vibration bonding process. At the same time as the lateral bonding process in step S4, the third motor (18) is started. The rotor of the third motor (18) drives the turntable (19) to rotate. During the rotation process, the transmission rod (21) on the turntable (19) drives the transmission frame (24) to make a left-right reciprocating motion. The transmission frame (24) drives the side plate (22) and the pressure roller (23) inside the side plate (22) to vibrate synchronously during the lateral bonding movement. The vibration of the pressure roller (23) is used to process bubbles in the bonding process, optimize the pressure distribution, adjust the glue distribution, and improve the stress distribution.

6. The bonding process of a large-size display screen and a touch screen according to claim 5, characterized in that: In step S1, the first motor (3), the second motor (12) and the third motor (18) are pre-tested. The pre-test includes checking whether the circuit connection of the motor is normal. By using a professional circuit testing instrument, the power line and the control line of the motor are tested for short circuit and open circuit. At the same time, the rotor of the motor is checked to see whether the rotor can rotate flexibly and whether there is any jamming, so as to avoid the phenomenon of lamination failure caused by the jamming of the rotor during re-lamination.

7. The bonding process of a large-size display screen and a touch screen according to claim 5, characterized in that: In the step S2, before placing the touch screen and the liquid crystal display screen, the touch screen and the liquid crystal display screen are cleaned with a cleaning agent and a dust-free cloth to remove dust and oil stains on the surface.

8. The bonding process of a large-size display screen and a touch screen according to claim 5, characterized in that: The determination of the predetermined position in step S3 is calculated and adjusted according to the thickness and hardness of the touch screen and the liquid crystal display.

9. The bonding process of a large-size display screen and a touch screen according to claim 5, characterized in that: In step S4, at the beginning of the bonding process, since the initial contact state between the touch screen and the liquid crystal display screen is unstable, the initial movement speed of the second slider (14) is started from zero to ensure that the pressure roller (23) and the screen surface have enough time to perform good initial bonding, thereby reducing the generation of bubbles or loose bonding during the initial bonding. As the bonding progresses and the bonding state is confirmed to be stable, the movement speed is gradually increased.

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