An automatic positioning and laminating apparatus and method for a display panel

Abstract

The application discloses an automatic positioning and adhering device and method for a display panel, which comprises a rack, first driving devices on the left and right sides of the rack and in front of and behind a glass panel, second driving devices installed on the front and back sides of the first driving devices, push plates installed on the push rods of the first driving devices and the second driving devices, two first sensors and two second sensors arranged on the rack, and a plurality of suction cups arranged on a support frame at the free end of a multi-shaft mechanical arm; the glass panel and a liquid crystal panel are positioned by displacement with the same reference point, the alignment process of each sensor does not need mechanical contact, the stability of alignment is high, the service life is long, the tolerance ring of alignment is effectively reduced, the accuracy of adhesion is improved, the whole operation process is automatically completed, the space cleanliness is ensured during operation by fewer operators, labor is saved, production efficiency is effectively improved, and production cost is reduced, and therefore the actual use requirements of users are greatly met.

Description

Technical Field

[0001] This invention relates to the field of automation equipment technology, and in particular to an automatic positioning and bonding device and an automatic bonding method for display panels. Background Technology

[0002] As is well known, a liquid crystal display (LCD) is an active-matrix LCD driven by thin-film transistors. It primarily uses electric current to stimulate liquid crystal molecules to create dots, lines, and surfaces, which, in conjunction with backlighting, form the image. IPS, TFT, and SLCD are all subcategories of LCD. Their working principle is that under the influence of an electric field, the alignment of liquid crystal molecules changes, altering the transmittance of the external light source (modulation), thus completing an electro-optical conversion. Then, using different excitations of the R, G, and B primary color signals, and passing through red, green, and blue primary color filters, color reproduction in the temporal and spatial domains is achieved. With the increasing prevalence of educational machines, conference machines, and whiteboards, large-size LCDs have become widely popular. An LCD monitor mainly consists of a casing, control circuit board, power supply, and LCD screen. The LCD screen is the most crucial component, comprising a tempered glass panel, an LCD panel, and a backlight. In actual production, the tempered glass panel and LCD panel need to be aligned and bonded together. Currently, the bonding process involves manual positioning. First, the tempered glass panel is placed on a positioning platform with dozens of positioning blocks around it. Then, the LCD panel is manually placed onto the tempered glass panel, aligning and bonding the opaque LCD display area with the inner viewing window of the glass panel. Due to the increasing size of modern monitors, handling these materials requires multiple operators, and the entire process relies on manual experience for positioning and bonding. Because the positioning blocks and platform are multi-layered, the positioning references for the tempered glass panel and LCD panel are not the same, leading to significant mechanical positioning errors. The large size and unstable alignment tolerances, along with numerous tolerance loops and an overall large alignment tolerance, increase the probability of misalignment between the tempered glass panel and the LCD panel, leading to light leakage. Manual bonding based on experience results in poor consistency, and the presence of numerous operators increases the likelihood of dust and hair inside the screen after bonding, resulting in low yield, low product quality, and lower overall product quality. Furthermore, the large size of modern LCD screens increases the physical strain of manual material handling, leading to higher labor costs and low production efficiency, further impacting production capacity. As factories demand increasingly higher production capacity and product quality, existing alignment and bonding devices and methods for tempered glass panels and LCD panels are no longer sufficient to meet user needs and production requirements. Therefore, we propose an automatic positioning and bonding device and method for display panels to address these issues. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the purpose of this invention is to provide an automatic positioning and bonding device and an automatic bonding method for display panels.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: An automatic positioning and bonding device for a display panel includes a frame and a multi-axis robotic arm. A glass panel is placed on a transmission roller of the frame. First, liftable first drive devices are mounted on the frame and located on the left and right sides of the glass panel via first cylinders. Second drive devices are mounted on the frame and located on the front and rear sides of the glass panel. Push plates are mounted on the push rods of both the first and second drive devices, and these push plates are adapted to the sides of the glass panel. Two first sensors are mounted on the frame and are adapted to and aligned with the left or right side of the glass panel. Two second sensors are mounted on the frame and are adapted to and aligned with the front or rear side of the glass panel. A support frame is mounted at the free end of the multi-axis robotic arm, and several suction cups are mounted on the support frame to adhere to the liquid crystal panel. A host computer controlling the orderly operation of the system is mounted on the frame. When the first cylinder drives the first drive devices to rise, the push plates on the first drive devices are aligned with the sides of the glass panel.

[0005] Preferably, it also includes a tooling table, the surface of which is provided with a positioning groove adapted to the LCD panel, and a notch is provided on one side of the positioning groove, and the LCD panel is placed in the positioning groove.

[0006] Preferably, the support frame includes an upper fixed plate, a middle fixed plate, and a lower fixed plate. The upper fixed plate is installed on the free end of the multi-axis robotic arm. A first motor and a first sliding shaft are mounted on the upper fixed plate. A second motor is mounted on the middle fixed plate. A second sliding shaft perpendicular to the first sliding shaft is mounted on the lower fixed plate. The middle fixed plate is mounted on the first sliding shaft via a slider. A first rack parallel to the first sliding shaft is mounted on the middle fixed plate. A gear on the main shaft of the first motor meshes with the first rack. A second rack parallel to the second sliding shaft is mounted on the lower fixed plate. The middle fixed plate is connected to the second sliding shaft via a slider. A gear on the main shaft of the second motor meshes with the second rack. The suction cup is mounted on the lower fixed plate.

[0007] Preferably, the frame is provided with a first limit block, a first limit switch, a second limit block, and a second limit switch. The first limit block and the first limit switch can be adapted to and contact the two ends of the push rod of one of the first driving devices, respectively. The second limit block and the second limit switch can be adapted to and contact the two ends of the push rod of one of the second driving devices, respectively.

[0008] Preferably, the push plate is provided with a soft rubber pad that is adapted to the side of the glass panel.

[0009] Preferably, the driving device is a pneumatic cylinder, a hydraulic cylinder, an electric cylinder, or an electric push rod.

[0010] Preferably, the first sensor and the second sensor are laser-guided photoelectric switches or slotted photoelectric switches.

[0011] Preferably, the first cylinder is a double-rod cylinder.

[0012] An automatic bonding method for display panels S1. The transmission rollers of the frame transport the glass panel to a preset position between the first drive device and the second drive device; S2. The first cylinder drives the first drive device to rise and extend. The push rod of the first drive device on the right side of the glass panel pushes the glass panel to the left through the push plate, so that the black silkscreen area at the left edge of the glass panel passes through the sensing area of ​​the two first sensors. At the same time, after the push rod of the first drive device touches the first limit block, the push rod of the first drive device moves backward to touch the first limit switch and resets to stop moving. The push rod of the second drive device on the front side of the glass panel pushes the glass panel backward through the push plate, so that the black silkscreen area at the rear edge of the glass panel passes through the sensing area of ​​the two second sensors. At the same time, after the push rod of the second drive device touches the second limit block, the push rod of the second drive device moves backward to touch the second limit switch and resets to stop moving. S3. The push rod of the first driving device on the left side of the glass panel pushes the glass panel to the right through the push plate. At the same time, when the left side of the inner viewing window of the glass panel touches the sensing areas of the two first sensors, the movement of the glass panel is stopped, and the left side of the glass panel is positioned. The push rod of the second driving device on the rear side of the glass panel pushes the glass panel forward through the push plate. At the same time, when the rear side of the inner viewing window of the glass panel touches the sensing areas of the two second sensors, the movement of the glass panel is stopped, and the rear side of the glass panel is positioned. S4. The suction cup on the multi-axis robotic arm moves to the upper end of the tooling table, and the multi-axis robotic arm drives the suction cup to move down and adsorb the liquid crystal panel in the positioning groove, and moves it to the upper end of the glass panel; S5. The multi-axis robotic arm moves the adsorbed liquid crystal panel to the outside of the two first sensors and two second sensors, and makes the bottom surface of the liquid crystal panel parallel to the top surface of the glass panel; S6. The first motor drives the fixed plate to move to the left, and simultaneously drives the liquid crystal panel to move to the left. When the left edge of the opaque liquid crystal display area of ​​the liquid crystal panel simultaneously touches the sensing areas of the two first sensors, the first motor stops pushing the liquid crystal panel to move, and the left edge of the opaque liquid crystal display area of ​​the liquid crystal panel is aligned with the left side of the inner viewing window of the glass panel. The second motor drives the lower fixed plate to move backward, and simultaneously drives the liquid crystal panel to move backward. When the rear edge of the opaque liquid crystal display area of ​​the liquid crystal panel simultaneously touches the sensing areas of the two second sensors, the second motor stops pushing the liquid crystal panel to move, and the rear edge of the opaque liquid crystal display area of ​​the liquid crystal panel is aligned with the rear edge of the inner viewing window of the glass panel. The liquid crystal panel and the glass panel are precisely aligned. S6. The multi-axis robotic arm moves the adsorbed liquid crystal panel vertically downward and makes the bottom surface of the liquid crystal panel fit with the top surface of the glass panel to form an integrated structure; S7. The first cylinder drives the first drive device to descend and retract, and the transmission rollers of the frame transport the combination of the glass panel and the liquid crystal panel to the next workstation.

[0013] Due to the adoption of the above-mentioned solution, the present invention has the following obvious advantages and beneficial effects compared with the prior art: 1. The first and second sensors are fixed on the frame. The first and second driving devices use the sensing areas of the two sensors as reference points to precisely position the glass panel on two adjacent sides of the glass panel. At the same time, the multi-axis robotic arm precisely positions the adsorbed liquid crystal panel with the sensing areas of the first and second sensors. The glass panel and the liquid crystal panel are positioned using the same reference points. The alignment process between the glass panel and the liquid crystal panel and the two sensors does not require mechanical contact, resulting in high alignment stability and long service life. This effectively reduces the tolerance loop between the two, thereby greatly reducing the positioning error between the glass panel and the liquid crystal panel, improving the accuracy of their bonding, effectively preventing light leakage caused by misalignment, effectively increasing the consistency of mass alignment and bonding operations, and improving the yield and quality of the bonded products. 2. The entire process of glass panel conveying and accurate positioning, LCD panel transfer and accurate alignment, and bonding is fully automated by the host control system. This effectively reduces errors caused by manual operation and contamination of the product by dust and hair, ensuring the cleanliness of the workspace during bonding operations. This significantly reduces defects and failure rates after bonding. Furthermore, only a small number of operators are needed for loading and unloading, reducing labor intensity, saving labor costs, and effectively improving production efficiency and reducing production costs. Therefore, it greatly meets the actual needs of users, increases the production capacity of LCD production lines, and features a simple structure, low overall cost, and high bonding efficiency, demonstrating significant advantages and progress. Attached Figure Description

[0014] Figure 1 This is an isometric view of an embodiment of the present invention.

[0015] Figure 2 This is a schematic diagram of the support frame according to an embodiment of the present invention.

[0016] Figure 3 This is a schematic diagram of the structure of the first limiting block in an embodiment of the present invention.

[0017] Figure 4 This is a schematic diagram of the alignment and bonding of the liquid crystal panel and the glass panel in an embodiment of the present invention.

[0018] Figure 5 This is a schematic diagram of the structure of the glass panel in an embodiment of the present invention.

[0019] Figure 6 This is a schematic diagram of the structure of the liquid crystal panel according to an embodiment of the present invention.

[0020] In the picture: 1. Frame; 2. Multi-axis robotic arm; 3. Drive roller; 4. Glass panel; 5. First drive unit; 6. Second drive unit; 7. Push rod; 8. Push plate; 9. First cylinder; 10. First sensor; 11. Second sensor; 12. Support frame; 13. Suction cup; 14. LCD panel; 15. Main unit; 16. Tooling table; 17. Positioning slot; 18. Notch; 19. Upper fixing plate; 20. Middle fixing plate; 21. 21. Lower fixed plate; 22. First motor; 23. First sliding shaft; 24. Second motor; 25. Second sliding shaft; 26. Slider; 27. First rack; 28. Second rack; 29. ​​First limit block; 30. First limit switch; 31. Second limit block; 32. Second limit switch; 33. Soft rubber pad; 34. Black silkscreen area; 35. Sensing area; 36. Inner viewing window; 37. Opaque liquid crystal display area; 38. Edge area. Detailed Implementation

[0021] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0022] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper end," "lower end," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention 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 the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. 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, and they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0024] Before describing the operation of this embodiment, to facilitate understanding, the liquid crystal panel 14 and the glass panel 4 are described as follows: The liquid crystal panel 14 generally consists of an opaque liquid crystal display area and transparent edge areas 38 on all four sides of the liquid crystal display area (e.g., Figure 6 As shown); the edge of the glass panel 4 has an opaque black silkscreen area 34, and the center is a transparent inner viewing window 36 (as shown). Figure 5 As shown, when the LCD panel 14 and the glass panel 4 are aligned and bonded, the four sides of the opaque LCD display area 37 of the LCD panel 14 and the four sides of the inner viewing window 36 in the middle of the glass panel 4 need to be precisely aligned and bonded to ensure that when the user views the screen, the image displayed in the LCD display area is completely presented in the inner viewing window 36 area.

[0025] like Figures 1 to 6As shown, this embodiment provides an automatic positioning and bonding device for a display panel, including a frame 1 and a multi-axis robotic arm 2. A glass panel 4 is placed on the transmission roller 3 of the frame 1. First lifting drive devices 5 are mounted on the frame 1 on the left and right sides of the glass panel 4 via first cylinders 9. Second drive devices 6 are mounted on the frame 1 on the front and rear sides of the glass panel 4. Push plates 8 are mounted on the push rods 7 of both the first and second drive devices 5. The push plates 8 are adapted to the sides of the glass panel 4. When the first cylinder 9 drives the first drive device 5 to rise, the push plates 8 on the first drive device 5 are adapted to the sides of the glass panel 4. For alignment, the frame 1 is equipped with two first sensors 10 that are adapted to and aligned with the left or right side of the glass panel 4, and two second sensors 11 that are adapted to and aligned with the front or rear side of the glass panel 4. The free end of the multi-axis robotic arm 2 is equipped with a support frame 12, and the support frame 12 is equipped with several suction cups 13, which can adsorb the liquid crystal panel 14. The frame 1 is equipped with a host 15 that controls the orderly operation of the system. The multi-axis robotic arm 2 moves the liquid crystal panel 14 and makes the four sides of the opaque liquid crystal display area 37 of the liquid crystal panel 14 precisely aligned and fitted with the four sides of the inner viewing window 36 in the middle of the glass panel 4.

[0026] In actual operation of this embodiment, since the first sensor 10 and the second sensor 11 are fixed on the frame 1, the first driving device 5 and the second driving device 6 use the sensing areas 35 of the two first sensors 10 and the second sensor 11 as reference points to precisely position the glass panel 4 with the two adjacent sides of the glass panel 4. Simultaneously, the multi-axis robotic arm 2 precisely positions the opaque liquid crystal display area 37 of the adsorbed liquid crystal panel 14 with the sensing areas 35 of the two first sensors 10 and the second sensor 11. Therefore, the glass panel 4 and the liquid crystal panel 14 use the sensing areas 35 of the two first sensors 10 and the second sensor 11 as shared reference points for displacement positioning, effectively reducing the impact of the glass panel 4 on the liquid crystal. The tolerance ring for the alignment of the crystal panel 14 significantly reduces the positioning error between the glass panel 4 and the liquid crystal panel 14, improving the accuracy of their bonding and effectively preventing light leakage caused by misalignment. This also increases the consistency of mass alignment and bonding operations, improving the yield and quality of the bonded products. The entire process of conveying and accurately positioning the glass panel 4, and transferring, accurately aligning, and bonding the liquid crystal panel 14, is fully automated by the main control system 15. This effectively reduces errors caused by manual operation and contamination of the products by dust and hair, ensuring the cleanliness of the workspace during bonding operations. This significantly reduces defects and failure rates after bonding. At the same time, only a small number of operators are needed for loading and unloading, reducing the labor intensity of workers, saving labor, reducing labor costs, effectively improving production efficiency, and reducing production costs. Therefore, this greatly meets the actual needs of users.

[0027] Furthermore, this embodiment also includes a tooling table 16. The surface of the tooling table 16 is provided with a positioning groove 17 adapted to the LCD panel 14. A notch 18 is provided on one side of the positioning groove 17, and the LCD panel 14 is placed in the positioning groove 17. Therefore, the LCD panel 14 is accurately placed in the positioning groove 17, and the LCD panel 14 is initially positioned for loading, which facilitates the multi-axis robotic arm 2 to accurately transfer the LCD panel 14 material, increases the consistency of the material transfer and positioning of the multi-axis robotic arm 2, and the notch 18 facilitates the LCD panel 14 to enter and exit the positioning groove 17.

[0028] Furthermore, the support frame 12 in this embodiment includes an upper fixed plate 19, a middle fixed plate 20, and a lower fixed plate 21. The upper fixed plate 19 is installed at the free end of the multi-axis robotic arm 2. A first motor 22 and a first sliding shaft 23 are installed on the upper fixed plate 19. A second motor 24 is installed on the middle fixed plate 20. A second sliding shaft 25 perpendicular to the first sliding shaft 23 is installed on the lower fixed plate 21. The middle fixed plate 20 is installed on the first sliding shaft 23 via a slider 26. A first rack 27 parallel to the first sliding shaft 23 is installed on the middle fixed plate 20. The gear on the main shaft of the first motor 22 meshes with the first rack 27. A second rack 28 parallel to the second sliding shaft 25 is installed on the lower fixed plate 21. The middle fixed plate 20 is connected to the second sliding shaft 25 via the slider 26. The gear on the main shaft of the second motor 24 meshes with the second rack 28. A suction cup 13 is installed on the lower fixed plate 21. Therefore, when the liquid crystal panel 14, adsorbed by the suction cup 13 of the multi-axis robotic arm 2, moves to the upper end of the glass panel 4 after positioning, the first motor 22 drives the fixing plate 20 to move to the left, simultaneously moving the liquid crystal panel 14 to the left. When the left edge of the opaque liquid crystal display area 37 of the liquid crystal panel 14 simultaneously touches the sensing areas 35 of the two first sensors 10, the first motor 22 stops pushing the liquid crystal panel 14 to move, and the left edge of the opaque liquid crystal display area 37 of the liquid crystal panel 14 is aligned with the left side of the inner viewing window 36 of the glass panel 4. The second motor 24 then drives... The lower fixed plate 21 moves backward, simultaneously causing the liquid crystal panel 14 to move backward. When the rear edge of the opaque liquid crystal display area of ​​the liquid crystal panel 14 simultaneously touches the sensing area 35 of the two second sensors 11, the second motor 24 stops pushing the liquid crystal panel 14 to move. The rear edge of the opaque liquid crystal display area 37 of the liquid crystal panel 14 is aligned with the rear edge of the inner viewing window 36 of the glass panel 4. Through the above steps, the liquid crystal panel 14 and the glass panel 4 are precisely aligned, thereby improving the alignment accuracy of the liquid crystal panel 14 and the glass panel 4 and preventing misalignment.

[0029] Furthermore, the frame 1 in this embodiment is equipped with a first limiting block 29, a first limiting switch 30, a second limiting block 31, and a second limiting switch 32. The first limiting block 29 and the first limiting switch 30 can respectively adapt to and contact the two ends of the push rod 7 of one of the first driving devices 5, and the second limiting block 31 and the second limiting switch 32 can respectively adapt to and contact the two ends of the push rod 7 of one of the second driving devices 6. This structure ensures accurate positioning of the push rods 7 of the first driving device 5 and the second driving device 6, increases the positioning accuracy of the push rod 7 pushing the glass panel 4, prevents over-pushing of the glass panel 4, and increases the consistency of the initial positioning of the glass panel 4 and the stability of the overall machine alignment.

[0030] Furthermore, in this embodiment, the push plate 8 is provided with a soft rubber pad 33 that is adapted to the side of the glass panel 4. The soft rubber pad 33 provides friction when the push plate 8 contacts the side of the glass panel 4, improving the stability of the push plate 8 when moving the glass panel 4. At the same time, since the soft rubber pad 33 is relatively soft while the glass panel 4 is relatively hard and brittle, the soft rubber pad 33 can reduce the impact force when the push plate 8 touches the side of the glass panel 4, preventing the push plate 8 from breaking the glass panel 4.

[0031] Furthermore, the driving device in this embodiment is a pneumatic cylinder, a hydraulic cylinder, an electric cylinder, or an electric push rod 7. The electric cylinder is a modular product that integrates a servo motor and a lead screw, converting the rotary motion of the servo motor into linear motion. Simultaneously, it transforms the best advantages of the servo motor—precise speed control, precise revolution control, and precise torque control—into precise speed control, precise position control, and precise thrust control, achieving high-precision linear motion. Therefore, the push rod 7 of the electric cylinder outputs not only large but also accurate thrust; hence, this device preferably uses an electric cylinder as the driving device.

[0032] Furthermore, in this embodiment, the first sensor 10 and the second sensor 11 are laser-beam photoelectric switches or slotted photoelectric switches. Beam photoelectric switches are a common type of photoelectric switch, widely used in various automated equipment. A laser-beam photoelectric switch is a device that uses the interaction between a laser beam and a photodiode to achieve switch control. It has wide applications in the field of automatic control, such as object detection on industrial production lines and intrusion alarms in security systems. The principle of a laser-beam photoelectric switch is based on the characteristics of a laser beam and the response of a photodiode to light signals. Laser beams have characteristics such as high brightness, high directionality, and high monochromaticity, and can transmit at a very small scattering angle, thus ensuring the collimation and stability of the emitted light. A photodiode is a device that can convert light signals into electrical signals. Its working principle is that when light shines on the PN junction of the photodiode, the generated photoelectrons and holes are separated under the action of an electric field, thereby forming a current. A laser-beam photoelectric switch is implemented by dividing the laser beam into two parts: a transmitter and a receiver. The transmitter emits a laser beam, which passes through a certain optical system to form a straight beam. The receiver is placed on the opposite side of the laser beam, aligned in a straight line with the transmitter. When an object is in the path of the laser beam, it scatters or absorbs the beam, weakening or eliminating the light signal received by the receiver. At this point, the photodiode in the receiver cannot generate sufficient current, causing a change in the corresponding voltage signal. By detecting the voltage signal in the receiver, it can be determined whether an object is blocking the path of the laser beam. The working process of the laser-to-beam photoelectric switch is as follows: First, the transmitter emits a laser beam, which is formed into a straight beam by the optical system. Then, when the beam encounters an object, it is scattered or absorbed, preventing some light from reaching the receiver. The light signal received by the receiver weakens or disappears accordingly. The photodiode cannot generate sufficient current, causing a change in the receiver's voltage signal. Finally, by detecting the change in the receiver's voltage signal, it is determined whether an object is blocking the path of the laser beam. The laser-to-beam photoelectric switch has the following advantages: First, the collimation and stability of the laser beam allow for long-distance transmission, increasing the detection range of the switch. Second, the laser-to-beam photoelectric switch has high object detection accuracy, enabling the detection of even small objects. In addition, laser photoelectric switches have a fast response speed, enabling them to monitor the state of objects in real time and perform corresponding control.Therefore, when the alignment edges of the glass panel 4 and the liquid crystal panel 14 touch the emitter of the laser beam emitted by the laser photoelectric switch, the receiver of the laser photoelectric switch will immediately sense it. It should be explained that the space between the emitter and receiver of the laser photoelectric switch is the second sensor 11 and its sensing area 35. The diameter of the laser beam emitted by the photoelectric switch is very small, typically 0.1 mm to 0.5 mm. When the alignment edges of the glass panel 4 and the liquid crystal panel 14 touch the emitter of the laser beam emitted by the photoelectric switch, the glass panel 4 and the liquid crystal panel 14 immediately stop moving and complete positioning, thereby aligning the glass panel 4 and the liquid crystal panel 14 with the second sensor. The alignment accuracy of the first sensor 10 and the second sensor 11 is very high. At the same time, compared with traditional mechanical switches, the alignment process between the glass panel 4 and the liquid crystal panel 14 and the two sensors 10 and 11 is non-contact triggered by the photoelectric switch, which can avoid wear and failure caused by mechanical contact, thus having a longer service life. The photoelectric switch is also easy to install and use. Because it uses optical signal transmission, it is not affected by electromagnetic interference, is easy to install, and can be arranged in a small space, thus making the system design more flexible. Therefore, the laser photoelectric switch is the preferred choice for the first sensor 10.

[0033] Furthermore, in this embodiment, the first cylinder 9 is a double-rod cylinder. A double-shaft double-rod cylinder consists of a cylinder body, a cylinder head, a rod joint, and other components. Due to its structural characteristics, the dual-axis dual-rod cylinder can achieve parallel bidirectional motion within a relatively small volume. Compared with the single-axis single-rod cylinder, the dual-axis dual-rod cylinder has obvious advantages: Good stability: In the field of automated production, accuracy and stability are very important indicators. The parallel bidirectional motion of the dual-axis dual-rod cylinder can ensure stability during operation and avoid shaking caused by uneven force. At the same time, since the two rods move simultaneously, it can ensure uniform force, improve the system's load capacity, and enhance the reliability of the production process. High precision: High-precision machining requires high-precision pneumatic equipment, and the dual-axis dual-rod cylinder is precisely such a device that meets the requirements. Due to the parallel motion, its positioning accuracy can reach 0.05 mm, which can meet the needs of fine assembly and production. High speed: In automated production, the speed of production largely determines product quality and production efficiency. Because the dual-axis dual-rod cylinder has bidirectional motion capability, it operates at a faster speed, saving production time and improving production efficiency and production line throughput. Therefore, the dual-rod cylinder is the preferred choice for the first cylinder 9.

[0034] An automatic bonding method for display panels S1. The drive roller 3 of the frame 1 transports the glass panel 4 to a preset position between the first drive device 5 and the second drive device 6; S2. The first cylinder 9 drives the first driving device 5 to rise and extend. The push rod 7 of the first driving device 5 on the right side of the glass panel 4 pushes the glass panel 4 to the left through the push plate 8, so that the black silk screen printing area 34 at the left edge of the glass panel 4 passes through the sensing area 35 of the first sensor 10. At the same time, after the push rod 7 of the first driving device 5 touches the first limit block 29, the push rod 7 of the first driving device 5 moves backward to touch the first limit switch 30 and resets to stop moving, so that the push plate 8 on the push rod 7 of the second driving device 6 is adapted and aligned with the glass panel 4. The push rod 7 of the second driving device 6 on the front side of the glass panel 4 pushes the glass panel 4 backward through the push plate 8, so that the black silk screen printing area 34 at the rear edge of the glass panel 4 passes through the sensing area 35 of the second sensor 11. At the same time, after the push rod 7 of the second driving device 6 touches the second limit block 31, the push rod 7 of the second driving device 6 moves backward to touch the second limit switch 32 and resets to stop moving. S3. The push rod 7 of the first driving device 5 on the left side of the glass panel 4 pushes the glass panel 4 to the right through the push plate 8. At the same time, when the left side of the inner viewing window 36 of the glass panel 4 touches the sensing area 35 of the two first sensors 10, the movement of the glass panel 4 is stopped, and the left side of the glass panel 4 is positioned. The push rod 7 of the second driving device 6 on the rear side of the glass panel 4 pushes the glass panel 4 forward through the push plate 8. At the same time, when the rear side of the inner viewing window 36 of the glass panel 4 touches the sensing area 35 of the two second sensors 11, the movement of the glass panel 4 is stopped, and the rear side of the glass panel 4 is positioned. S4. The suction cup 13 on the multi-axis robotic arm 2 moves to the upper end of the tooling table 16. The multi-axis robotic arm 2 drives the suction cup 13 to move down and adsorbs the liquid crystal panel 14 in the positioning groove 17 and moves it to the upper end of the glass panel 4. S5. The multi-axis robotic arm 2 moves the adsorbed liquid crystal panel 14 to the outside of the sensors of the first sensor 10 and the second sensor 11, and makes the bottom surface of the liquid crystal panel 14 parallel to the top surface of the glass panel 4. S6. The first motor 22 drives the middle fixing plate 20 to move to the left, and at the same time, drives the liquid crystal panel 14 to move to the left. When the left edge of the opaque liquid crystal display area 37 of the liquid crystal panel 14 touches the sensing area 35 of the two first sensors 10 at the same time, the first motor 22 stops pushing the liquid crystal panel 14 to move, and the left edge of the opaque liquid crystal display area 37 of the liquid crystal panel 14 is aligned with the left side of the inner viewing window 36 of the glass panel 4. The second motor 24 drives the lower fixing plate 21 to move backward, and at the same time, drives the liquid crystal panel 14 to move backward. When the rear edge of the opaque liquid crystal display area of ​​the liquid crystal panel 14 touches the sensing area 35 of the two second sensors 11 at the same time, the second motor 24 stops pushing the liquid crystal panel 14 to move, and the rear edge of the opaque liquid crystal display area 37 of the liquid crystal panel 14 is aligned with the rear edge of the inner viewing window 36 of the glass panel 4. The liquid crystal panel 14 and the glass panel 4 are precisely aligned. S6. The multi-axis robotic arm 2 moves the adsorbed liquid crystal panel 14 vertically downward and makes the bottom surface of the liquid crystal panel 14 fit with the top surface of the glass panel 4 to form an integrated structure. S7. The first cylinder 9 drives the first drive device 5 to descend and retract, so that the first drive device 5 is located inside the frame and below the transmission roller 3, so as not to obstruct the movement of the glass panel 4, ensuring that the transmission roller 3 smoothly transports the glass. Finally, the transmission roller 3 of the frame 1 transports the combination of the glass panel 4 and the liquid crystal panel 14 to the next station.

[0035] The above steps control the orderly operation of each system through the host 15, thereby realizing the fully automatic bonding operation of the LCD panel 14 and the glass panel 4. Only a small number of operators are needed for loading and unloading, reducing the labor intensity of workers, saving labor, reducing labor costs, effectively improving production efficiency, reducing production costs, effectively meeting the actual production needs of users, solving various shortcomings of the existing bonding operation of the LCD panel 14 and the glass panel 4, and realizing the automation upgrade of the bonding operation on the LCD production line.

[0036] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. An automatic positioning and bonding device for a display panel, characterized in that: The system includes a frame and a multi-axis robotic arm. A glass panel is placed on the transmission rollers of the frame. First, liftable drive devices are mounted on the frame and located on the left and right sides of the glass panel via first cylinders. Second drive devices are mounted on the frame and located on the front and rear sides of the glass panel. Push plates are mounted on the push rods of both the first and second drive devices, and these push plates are adapted to the sides of the glass panel. Two first sensors are mounted on the frame and are adapted to and aligned with the left or right side of the glass panel. Two second sensors are mounted on the frame and are adapted to and aligned with the front or rear side of the glass panel. A support frame is mounted at the free end of the multi-axis robotic arm, and several suction cups are mounted on the support frame to adhere to the liquid crystal panel. A host computer controlling the orderly operation of the system is mounted on the frame. When the first cylinder drives the first drive device to rise, the push plate on the first drive device is aligned with the side of the glass panel. It also includes a tooling table, the surface of which is provided with a positioning groove adapted to the LCD panel, and a notch is provided on one side of the positioning groove, and the LCD panel is placed in the positioning groove; The support frame includes an upper fixed plate, a middle fixed plate, and a lower fixed plate. The upper fixed plate is installed on the free end of the multi-axis robotic arm. A first motor and a first sliding shaft are mounted on the upper fixed plate. A second motor is mounted on the middle fixed plate. A second sliding shaft perpendicular to the first sliding shaft is mounted on the lower fixed plate. The middle fixed plate is mounted on the first sliding shaft via a slider. A first rack parallel to the first sliding shaft is mounted on the middle fixed plate. A gear on the main shaft of the first motor meshes with the first rack. A second rack parallel to the second sliding shaft is mounted on the lower fixed plate. The middle fixed plate is connected to the second sliding shaft via a slider. A gear on the main shaft of the second motor meshes with the second rack. The suction cup is mounted on the lower fixed plate. The frame is provided with a first limit block, a first limit switch, a second limit block, and a second limit switch. The first limit block and the first limit switch can be adapted to and contact the two ends of the push rod of one of the first driving devices, respectively. The second limit block and the second limit switch can be adapted to and contact the two ends of the push rod of one of the second driving devices, respectively. An automatic bonding method for an automatic positioning and bonding device for display panels includes the following steps: S1. The transmission rollers of the frame transport the glass panel to a preset position between the first drive device and the second drive device; S2. The first cylinder drives the first drive device to rise and extend. The push rod of the first drive device on the right side of the glass panel pushes the glass panel to the left through the push plate, so that the black silkscreen area at the left edge of the glass panel passes through the sensing area of ​​the two first sensors. At the same time, after the push rod of the first drive device touches the first limit block, the push rod of the first drive device moves backward to touch the first limit switch and resets to stop moving. The push rod of the second drive device on the front side of the glass panel pushes the glass panel backward through the push plate, so that the black silkscreen area at the rear edge of the glass panel passes through the sensing area of ​​the two second sensors. At the same time, after the push rod of the second drive device touches the second limit block, the push rod of the second drive device moves backward to touch the second limit switch and resets to stop moving. S3. The push rod of the first driving device on the left side of the glass panel pushes the glass panel to the right through the push plate. At the same time, when the left side of the inner viewing window of the glass panel touches the sensing areas of the two first sensors, the movement of the glass panel is stopped, and the left side of the glass panel is positioned. The push rod of the second driving device on the rear side of the glass panel pushes the glass panel forward through the push plate. At the same time, when the rear side of the inner viewing window of the glass panel touches the sensing areas of the two second sensors, the movement of the glass panel is stopped, and the rear side of the glass panel is positioned. S4. The suction cup on the multi-axis robotic arm moves to the upper end of the tooling table, and the multi-axis robotic arm drives the suction cup to move down and adsorb the liquid crystal panel in the positioning groove, and moves it to the upper end of the glass panel; S5. The multi-axis robotic arm moves the adsorbed liquid crystal panel to the outside of the two first sensors and two second sensors, and makes the bottom surface of the liquid crystal panel parallel to the top surface of the glass panel; S6. The first motor drives the fixed plate to move to the left, simultaneously moving the liquid crystal panel to the left. When the left edge of the opaque liquid crystal display area of ​​the liquid crystal panel simultaneously touches the sensing areas of the two first sensors, the first motor stops pushing the liquid crystal panel to move, and the left edge of the opaque liquid crystal display area of ​​the liquid crystal panel is aligned with the left side of the inner viewing window of the glass panel. The second motor drives the lower fixed plate to move backward, simultaneously moving the liquid crystal panel backward. When the rear edge of the opaque liquid crystal display area of ​​the liquid crystal panel simultaneously touches the sensing areas of the two second sensors, the second motor stops pushing the liquid crystal panel to move, and the rear edge of the opaque liquid crystal display area of ​​the liquid crystal panel is aligned with the rear edge of the inner viewing window of the glass panel. The liquid crystal panel and the glass panel are precisely aligned. S6. The multi-axis robotic arm moves the adsorbed liquid crystal panel vertically downward and makes the bottom surface of the liquid crystal panel fit with the top surface of the glass panel to form an integrated structure; S7. The first cylinder drives the first drive device to descend and retract, and the transmission rollers of the frame transport the combination of the glass panel and the liquid crystal panel to the next workstation.

2. The automatic positioning and bonding device for a display panel as described in claim 1, characterized in that: The push plate is provided with a soft rubber pad that fits the side of the glass panel.

3. The automatic positioning and bonding device for a display panel as described in claim 1, characterized in that: The driving device is a pneumatic cylinder, a hydraulic cylinder, an electric cylinder, or an electric push rod.

4. The automatic positioning and bonding device for a display panel as described in claim 3, characterized in that: The first and second sensors are laser-guided photoelectric switches or slotted photoelectric switches.

5. The automatic positioning and bonding device for a display panel as described in claim 1, characterized in that: The first cylinder is a double-rod cylinder.

Images