A touch display screen vacuum lamination apparatus

Abstract

The application provides a kind of touch display screen vacuum laminating equipment, including: machine body, the partition for placing display screen and the push rod being arranged in the interior of machine body;Further including with the lower plate of push rod power shaft connection, the surface of lower plate is equipped with slot two, the surface of slot two is connected with long rod, the surface of long rod is equipped with big ball head, when lower plate moves downwards, by the long outer plate being arranged on the surface of long rod, the surface of long outer plate is inclined plane, can adjust the extrusion degree of each area of the display screen substrate to be laminated, avoid local pressure too large and cause substrate or touch screen damage;The cooperation of short rod and long rod, short rod adapts to the short end of rectangular display screen substrate, long rod adapts to long end, match different inclination angle short outer plate and long outer plate, different protruding height small ball head and big ball head, can adapt to the size difference of rectangular substrate, make long end and short end stress uniform, solve the problem of uneven extrusion, edge curling of existing equipment, effectively improve the laminating quality.

Description

Technical Field

[0001] This invention relates to the field of display screen manufacturing, and more particularly to a vacuum bonding device for touch screens. Background Technology

[0002] As the core display component of various electronic devices, the bonding quality of touch screens directly affects the display effect, touch sensitivity and lifespan of the devices. Vacuum bonding technology is a key process to achieve tight bonding between the touch screen substrate and the touch screen, and the corresponding vacuum bonding equipment has been widely used in the field of electronic manufacturing. Existing vacuum bonding equipment mostly adopts a fixed extrusion structure, which makes it difficult to apply uniform pressure to the edge of the display substrate during the extrusion process. This is especially true for rectangular display substrates, where the long and short ends have different pressure areas. The fixed extrusion structure cannot adapt to this size difference, which can easily lead to insufficient pressure at the long end and excessive local pressure at the short end. This can result in defects such as bonding misalignment and edge curling, affecting the bonding flatness and product yield. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of the existing technology. The present invention proposes a vacuum bonding device for touch screen.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a touch screen vacuum bonding device, comprising: a body, a partition for placing the screen and a push rod disposed inside the body; It also includes a lower plate connected to the push rod drive shaft. The surface of the lower plate has a second slot, and a long rod is connected to the surface of the second slot. The surface of the long rod has a large ball head. When the lower plate moves downward, the large ball head contacts the surface of the display screen. The reaction force of the display screen pushes the large ball head to drive the long rod to rotate relative to the lower plate. The large ball head protrudes from the bottom of the lower plate, causing the long rod to squeeze the edge of the display screen.

[0005] Preferably, the push rod is provided with an outer frame on its outer side, and the surface of the outer frame is provided with a slot for accommodating the long rod. The slot is provided with an inner box, and the inner box is provided with a pull strap for assisting the long rod to return to its original position.

[0006] Preferably, the surface of the long rod is provided with a long outer plate. When the long rod rotates, the long outer plate first contacts the surface of the display. The surface of the long outer plate is inclined, which adjusts the squeezing force on each area of ​​the display screen.

[0007] Preferably, the surface of the lower plate is provided with an inner groove that communicates with the second slot. When the long rod rotates relative to the lower plate, a portion of the small ball head enters the inner groove.

[0008] Preferably, the surface of the outer frame is provided with short rods of different lengths from the long rods. When the short rods rotate relative to the lower plate, the short rods and the long rods respectively contact the short end and the long end of the display screen.

[0009] Preferably, the surface of the short rod is provided with a short outer plate, the outer side of which is a slope, and the inclination angle of the slope is smaller than the inclination angle of the surface of the long outer plate.

[0010] Preferably, the surface of the short rod is provided with a small ball head, the protrusion height of the small ball head being less than the protrusion height of the large ball head.

[0011] Preferably, the outer frame is a frustum structure that is larger at the top and smaller at the bottom, and the slot one is a longitudinal square slot along the arc surface of the outer frame.

[0012] Preferably, the pull strap is made of an elastic material, and when the long rod rotates relative to the lower plate, the pull strap is stretched and deformed.

[0013] Preferably, the inner box has an opening at one end near the long rod for the pull strap to enter and exit, guiding the extension and retraction direction of the pull strap.

[0014] Compared with the prior art, the beneficial effects of the present invention include: by setting a long outer plate on the surface of the long rod, the surface of the long outer plate is inclined, which can adjust the squeezing force of each area of ​​the display substrate to be bonded, and avoid excessive local pressure that could damage the substrate or touch screen; the cooperation between the short rod and the long rod, with the short rod adapting to the short end of the rectangular display substrate and the long rod adapting to the long end, and with the short and long outer plates of different tilt angles and the small and large ball heads of different protrusion heights, can adapt to the size differences of the rectangular substrate, so that the long end and the short end are subjected to uniform force, solving the problems of uneven squeezing and edge warping in existing equipment, and effectively improving the bonding quality. Attached Figure Description

[0015] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts. Wherein: Figure 1 The diagram schematically illustrates the structure of a touch screen vacuum bonding device according to an embodiment of the present invention.

[0016] Figure 2 The diagram schematically shows a cross-sectional view of a bonding device according to an embodiment of the present invention.

[0017] Figure 3 The diagram schematically illustrates an external frame structure according to one embodiment of the present invention.

[0018] Figure 4 The diagram illustrates a cross-sectional view of the external frame according to one embodiment of the present invention.

[0019] Figure 5 The diagram schematically illustrates the internal structure of the external frame according to one embodiment of the present invention.

[0020] Figure 6 The diagram schematically illustrates a lower plate structure according to an embodiment of the present invention.

[0021] Figure 7 The diagram schematically illustrates a short rod structure according to an embodiment of the present invention.

[0022] Numbered in the diagram: 1. Body; 2. Door panel; 3. Partition; 4. Display screen; 5. Control button; 6. Frame; 7. Outer frame; 8. Slot 1; 9. Push rod; 10. Long rod; 11. Long outer plate; 12. Lower plate; 13. Short outer plate; 14. Short rod; 15. Inner box; 16. Pull strap; 17. Large ball head; 18. Slot 2; 19. Inner slot; 20. Small ball head; Detailed Implementation

[0023] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0025] Example 1 According to one embodiment of the present invention, Figures 1-6 The diagram shows a touch screen vacuum bonding device, comprising, The main body 1 serves as the mounting carrier for the entire equipment. Its front end is equipped with a display screen 4 and an operation button 5. The display screen 4 is used to display parameters such as the working status of the equipment, vacuum level, and bonding progress, so that operators can monitor the equipment's operation in real time. The operation button 5 is used to control the start, stop, vacuum level adjustment, and lifting and lowering of the push rod 9, so that operators can perform their work.

[0026] A partition 3 is disposed inside the body 1 to hold the display substrate to be bonded. A frame 6 is provided on the surface of the partition 3, which is adapted to the shape of the display substrate to restrict its position, ensuring that the vertical position of the display substrate and the touchscreen to be bonded is relatively fixed. This prevents misalignment during bonding due to substrate displacement, ensuring bonding accuracy. Simultaneously, a vacuum pump is installed inside the partition 3, connected to the internal space of the body 1. During operation, it extracts gas from inside the body 1, creating a vacuum space. This reduces air bubbles during bonding of the display substrate and the touchscreen, improving bonding quality and preventing air bubbles from affecting the display effect and performance of the touchscreen.

[0027] The push rod 9 is fixed inside the machine body 1. The push rod 9 can be an existing power component such as a cylinder, hydraulic cylinder or electric push rod. Its power axis is set downward and fixedly connected to the lower plate 12. It is used to drive the lower plate 12 to move up and down in the vertical direction to provide power for the bonding and extrusion.

[0028] An outer frame 7 is provided on the outside of the push rod 9. The outer frame 7 is fixed to the surface of the push rod 9. The outer frame 7 is a frustum structure with a larger top and a smaller bottom. The surface of the outer frame 7 is provided with a slot 8, which is a longitudinal square slot along the arc surface of the outer frame 7. It is used to accommodate the long rod 10, provide room for the rotation of the long rod 10, and avoid interference between the long rod 10 and the outer frame 7 when it rotates.

[0029] The slot 8 has an inner box 15 inside, which is fixed to the inner wall of the slot 8. The inner box 15 has a pull strap 16 inside, which is used to assist the long rod 10 in resetting. Specifically, the pull strap 16 is made of elastic material, such as rubber or spring tape, which have good elastic recovery properties. The inner box 15 has an opening at one end near the long rod 10 for the pull strap 16 to enter and exit. This opening can guide the extension and retraction direction of the pull strap 16, preventing the pull strap 16 from getting tangled or deviating during the stretching or contraction process, and ensuring that the pull strap 16 can reset the long rod 10 stably and reliably.

[0030] The surface of the lower plate 12 is provided with a second slot 18, which corresponds to the first slot 8 on the outer frame 7. The surface of the second slot 18 is rotatably connected to the long rod 10, so that the long rod 10 can rotate around a point relative to the lower plate 12. The surface of the long rod 10 is provided with a large ball head 17, which is made of wear-resistant and smooth material to avoid scratching the display substrate or touch screen surface to be bonded.

[0031] The surface of the long rod 10 is also provided with a long outer plate 11. The long outer plate 11 is fixed to one end of the long rod 10 near the large ball head 17. When the long rod 10 rotates, the long outer plate 11 first contacts the surface of the display substrate to be bonded. The surface of the long outer plate 11 is a slope. This slope structure can adjust the squeezing force of each area of ​​the display substrate to be bonded, so that the squeezing force is more uniform and avoids excessive local pressure that could damage the display substrate or touch screen.

[0032] The surface of the lower plate 12 is provided with an inner groove 19 that communicates with the second slot 18. The size of the inner groove 19 is adapted to the small ball head 20 on the long rod 10. When the long rod 10 rotates relative to the lower plate 12, a part of the small ball head 20 enters the inner groove 19. The inner groove 19 limits the rotation angle of the long rod 10 by limiting the small ball head 20, so as to avoid excessive rotation of the long rod 10 and damage to the structure. At the same time, it ensures that the large ball head 17 can stably squeeze the edge of the display substrate to be bonded.

[0033] The operator first places the display substrate to be bonded on the partition 3, and fixes the position of the display substrate with the frame 6, so that the display substrate is vertically aligned with the touch screen to be bonded. Then, the equipment is started by operating button 5, and the vacuum pump inside the partition 3 starts to work, extracting the gas inside the machine body 1 to form a vacuum space. Next, the push rod 9 is extended downward, driving the lower plate 12 to move downward. When the large ball head 17 contacts the surface of the touch screen to be bonded, the touch screen generates a reaction force on the large ball head 17, pushing the large ball head 17 to drive the long rod 10 to rotate relative to the lower plate 12 around the connection point. At this time, the pull strap 16... The device is stretched and deformed, generating an elastic restoring force. As the push rod 9 continues to move downward, the large ball head 17 protrudes from the bottom of the lower plate 12, the long rod 10 gradually unfolds, and the long outer plate 11 makes full contact with the surface of the display substrate to be bonded. Through the inclined structure of the long outer plate 11, a uniform pressing force is applied to the edge of the display substrate, pushing the display substrate and the touch screen to bond tightly. After bonding is completed, the push rod 9 is controlled to retract upward, and the elastic restoring force of the pull strap 16 drives the long rod 10 to rotate in the opposite direction, returning to the initial position. The vacuum pump stops working, the machine body 1 is opened, and the bonded touch screen is taken out, completing one bonding operation.

[0034] As is conceivable, at the connection between the lower plate 12 and the long rod 10, the direct abutment triggering method of the large ball head 17 is replaced with a cam-link triggering mechanism. Specifically, a fixed cam track is provided on the inner side wall of the outer frame 7, and a follower roller is provided at the top of the long rod 10. When the push rod 9 drives the lower plate 12 to produce axial displacement relative to the outer frame 7, the follower roller slides along the cam track, and the long rod 10 is forced to rotate around the turning point of the slot 18 by a preset angle through the cam curve. This forced displacement drive replaces the contact reaction force drive in Embodiment 1. When processing highly brittle substrates, the intervention timing and pressure change rate of the long outer plate 11 can be precisely controlled by the preset cam curve.

[0035] It is conceivable that the fixed inclined structure of the long outer plate 11 can be replaced with a multi-chamber flexible airbag cushion. The interior of the airbag cushion is divided into multiple independent pressure zones according to the stress requirements of the rectangular substrate. By adjusting the base pressure inside the airbag, the effect of inclined extrusion at different angles can be simulated. This fluid pressure distribution replaces the geometric inclined distribution, and has the same technical essence in achieving the function of uniform extrusion.

[0036] The push rod 9 drives the lower plate 12 downward, causing the large ball head 17 at the bottom of the long rod 10 to first contact the surface of the touchscreen to be bonded. The reaction force generated by the touchscreen pushes the large ball head 17 upward, driving the long rod 10 to deflect at an angle relative to the lower plate 12 around its connection point. Simultaneously, it stretches the pull strap 16 in the inner box 15, allowing it to accumulate elastic potential energy. As the push rod 9 continues to press down, the long rod 10 drives the long outer plate 11 to gradually unfold outward. The inclined structure on the surface of the long outer plate 11 converts the vertical pressure into pressure acting on the edge of the substrate. The oblique uniform extrusion pressure achieves a smooth transition from point contact to surface pressing, solving the problems of substrate damage and bubble residue caused by local pressure overload in the prior art. In addition, the inner groove 19 limits the small ball head 20, accurately locking the maximum deflection angle of the long rod 10 and ensuring the stability of the extrusion path. After the operation is completed, the elastic restoring force of the pull belt 16 guides the long rod 10 to automatically return to the center, ensuring the continuity and automation of equipment reset, and significantly improving the accuracy and consistency of touch screen 4 bonding in a vacuum environment.

[0037] Example 2 According to one embodiment of the present invention, Figures 1-7 The diagram shows a touch screen vacuum bonding device, comprising, The surface of the outer frame 7 is provided with a short rod 14. The length of the short rod 14 is different from that of the long rod 10. Specifically, the length of the short rod 14 is shorter than that of the long rod 10. It is adapted to the short end of the rectangular display substrate to be bonded, while the long rod 10 is adapted to the long end of the rectangular display substrate to be bonded. The short rod 14 is rotatably connected to the lower plate 12. Its installation method is the same as that of the long rod 10. Both are connected to the lower plate 12 through the second slot 18. The short rod 14 is correspondingly set in the first slot 8 of the outer frame 7. It can move up and down with the lower plate 12 and can rotate relative to the lower plate 12.

[0038] When the short rod 14 rotates relative to the lower plate 12, the short rod 14 and the long rod 10 contact the short end and long end of the display substrate to be bonded, respectively, to achieve full compression of the four edges of the rectangular display substrate to be bonded. This avoids the problem of insufficient compression or uneven pressure at the short end due to the rectangular shape of the display substrate, and further improves the bonding quality.

[0039] The surface of the short rod 14 is provided with a short outer plate 13. The outer side of the short outer plate 13 is a slope. The slope angle is smaller than the slope angle of the surface of the long outer plate 11. Since the short rod 14 corresponds to the short end of the display substrate to be bonded and the long rod 10 corresponds to the long end of the display substrate to be bonded, the force-bearing area of ​​the short end is smaller than that of the long end. By setting slopes with different slope angles, the pressing force of the short outer plate 13 and the long outer plate 11 on the display substrate to be bonded can be made more uniform, avoiding excessive local pressure at the short end or insufficient pressure at the long end, and ensuring the flatness of the bonding between the display substrate and the touch screen.

[0040] The surface of the short rod 14 is provided with a small ball head 20. The small ball head 20 is similar in structure to the large ball head 17 on the long rod 10. Both are made of wear-resistant and smooth material. The protrusion height of the small ball head 20 is less than that of the large ball head 17. This setting is matched with the inclined angle of the short outer plate 13 and the long outer plate 11. Combined with the length difference between the short rod 14 and the long rod 10, the distribution of the extrusion force can be further optimized so that the pressure applied to the surface of the touch screen is uniform after the long rod 10 and the short rod 14 are fully extended. At the same time, it avoids the small ball head 20 protruding too high, which would cause excessive extrusion to the short end of the display substrate to be bonded.

[0041] When push rod 9 moves the lower plate 12 downward, the large ball head 17 on the long rod 10 and the small ball head 20 on the short rod 14 simultaneously contact the surface of the display substrate to be bonded. The reaction force of the display substrate pushes the large ball head 17 and the small ball head 20 respectively, causing the long rod 10 and the short rod 14 to rotate relative to the lower plate 12. At this time, the pull strap 16 corresponding to the long rod 10 and the pull strap 16 corresponding to the short rod 14 are stretched and deformed. As push rod 9 continues to move downward, the large ball head 17 and the small ball head 20 protrude from the bottom of the lower plate 12 respectively. The long outer plate 11 and the short outer plate 13 contact the long end and the short end of the display substrate to be bonded respectively. Since the inclined angle of the short outer plate 13 is smaller than that of the long outer plate 11, and the protrusion height of the small ball head 20 is smaller than that of the large ball head 17, the squeezing force on the long end and the short end is uniform, realizing the full and tight bonding of the rectangular display substrate to be bonded with the touch screen and enhancing the bonding effect.

[0042] As is conceivable, the short rod 14 and the long rod 10 have the same geometric length, but a first elastic element with a high stiffness coefficient is provided at the connection between the short rod 14 and the lower plate 12, while a second elastic element with a low stiffness coefficient is provided at the connection between the long rod 10 and the lower plate 12. Since the section modulus of bending resistance at the short end of the rectangular substrate is different from that at the long end, the first elastic element provides a larger reset resistance, which compensates for the tendency of pressure concentration caused by the small force-bearing area at the short end, so that the dynamic pressure generated by the short rod 14 when it contacts the short end of the substrate is consistent with that of the long rod 10 when it contacts the long end.

[0043] The inclined angles of the short outer plate 13 and the long outer plate 11 are set to be the same. However, the surface of the short outer plate 13 is covered with a flexible pad with a high compressibility, while the surface of the long outer plate 11 is covered with a hard pad with a low compressibility. When the push rod 9 drives the lower plate 12 to move down, the stress fluctuations caused by the different geometric spans of the long and short sides are automatically absorbed and balanced by the different deformation of the pad material, so as to achieve pressure self-balancing at the physical level.

[0044] The protrusion heights of the small ball head 20 and the large ball head 17 are adjusted to be consistent, but dampers are embedded inside the small ball head 20 and the large ball head 17. The damping ratios of the dampers of the small ball head 20 and the large ball head 17 are different, so that the resistance force experienced by the short rod 14 during the swing is different from that experienced by the long rod 10 during the swing. This achieves the same pressure uniformity effect as in Embodiment 2, and is more adaptable to display substrates of different material thicknesses, enhancing the versatility and bonding accuracy of the equipment.

[0045] The push rod 9 moves downward, driving the lower plate 12 to move. This causes the large ball head 17 and the small ball head 20 to simultaneously press against the surface of the substrate of the display screen 4 to be bonded. The reaction force generated by the substrate pushes the large ball head 17 and the small ball head 20 upward, thereby inducing the long rod 10 and the short rod 14 to rotate relative to the lower plate 12 and simultaneously stretch the pull strip 16. This causes the long outer plate 11 and the short outer plate 13 to unfold at different tilt angles and continuously bond to the edge of the substrate. Because the tilt angle of the short outer plate 13 is small and the protrusion height of the small ball head 20 is low, the difference in the force-bearing area of ​​the long and short sides of the rectangular substrate is compensated during the dynamic extrusion process. This makes the extrusion force applied to the touch screen surface by the long rod 10 and the short rod 14 more balanced, achieving precise distribution of pressure on the edge of the rectangular substrate. This solves the problem of uneven force or local pressure overload at the short end of the rectangular substrate in the prior art, ensuring the flatness of the bonding surface, avoiding bonding bubbles or substrate damage caused by pressure imbalance, and significantly improving the consistency of vacuum bonding.

[0046] 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.

[0047] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A vacuum bonding device for touch screens, characterized in that, include: The main body, a partition for placing the display substrate, and a push rod installed inside the main body; It also includes a lower plate connected to the push rod drive shaft. The surface of the lower plate has a second slot, and a long rod is connected to the surface of the second slot. The surface of the long rod has a large ball head. When the lower plate moves downward, the large ball head contacts the surface of the display substrate. The reaction force of the display substrate pushes the large ball head to drive the long rod to rotate relative to the lower plate. The large ball head protrudes from the bottom of the lower plate, so that the long rod squeezes the edge of the display substrate.

2. The touch screen vacuum bonding equipment according to claim 1, characterized in that, The push rod is provided with an outer frame on its outer side. The surface of the outer frame is provided with a slot for accommodating the long rod. The slot is provided with an inner box. The inner box is provided with a pull strap for assisting the long rod to return to its original position.

3. The touch screen vacuum bonding equipment according to claim 1, characterized in that, The long rod has a long outer plate on its surface. When the long rod rotates, the long outer plate first contacts the surface of the display. The surface of the long outer plate is inclined, which adjusts the squeezing force on each area of ​​the display substrate.

4. The touch screen vacuum bonding equipment according to claim 1, characterized in that, The surface of the lower plate is provided with an inner groove that communicates with the second slot. When the long rod rotates relative to the lower plate, a part of the small ball head enters the inner groove.

5. A touch screen vacuum bonding device according to claim 3, characterized in that, The surface of the outer frame is provided with short rods of different lengths from the long rods. When the short rods rotate relative to the lower plate, the short rods and the long rods contact the short and long ends of the display substrate, respectively.

6. A touch screen vacuum bonding device according to claim 5, characterized in that, The surface of the short rod is provided with a short outer plate, the outer side of which is a slope, and the inclination angle of the slope is smaller than that of the surface of the long outer plate.

7. A touch screen vacuum bonding device according to claim 6, characterized in that, The surface of the short rod is provided with a small ball head, the protrusion height of which is less than that of the large ball head.

8. A touch screen vacuum bonding device according to claim 2, characterized in that, The outer frame is a frustum structure that is larger at the top and smaller at the bottom, and the slot one is a longitudinal square slot along the arc surface of the outer frame.

9. A touch screen vacuum bonding device according to claim 2, characterized in that, The pull strap is made of elastic material, and it is stretched and deformed when the long rod rotates relative to the lower plate.

10. A touch screen vacuum bonding device according to claim 9, characterized in that, The inner box has an opening near the long rod for the pull strap to go in and out, guiding the direction of the pull strap's extension and retraction.

Images