A kind of alignment pressing equipment for LCD display screen

Abstract

The present application belongs to the technical field of display screen pressing, in particular to a positioning and pressing equipment for LCD display screen, comprising a mounting frame, the upper side wall of the mounting frame is fixedly connected with a connecting frame, the upper side wall of the connecting frame is fixedly connected with a first electric push rod, the moving end of the first electric push rod penetrates through the connecting frame and is fixedly connected with a sealing cover, the inner wall of the sealing cover is provided with a curing lamp, the upper side wall of the mounting frame is fixedly connected with a sealing box below the sealing cover, and the lower side wall of the mounting frame is connected with a vacuum pump. The present application can overcome the tendency of the frame sealing glue to slide inwards due to its own cohesion and pressure, spread the overflowing frame sealing glue to the outer circle of the CF color film substrate, and form an air pressure barrier between the TFT substrate and the CF color film substrate, so as to avoid the frame sealing glue flowing to the pixel area and avoid the frame sealing glue shielding the pixel light-emitting area, thereby solving the problems of display screen display black spots, bright spots, local missing pictures and uneven color.

Description

Technical Field

[0001] This invention belongs to the field of display screen lamination technology, and in particular relates to an alignment lamination device for LCD displays. Background Technology

[0002] Circular LCD screens are widely used in products such as automotive instruments and smartwatch dials. The industry generally uses a filling process with a liquid injection notch to complete the liquid crystal cell molding. A robotic arm places a circular TFT substrate coated with an annular UV sealant on the lower negative pressure stage. The notch in the annular UV sealant serves as the liquid injection port. The CF color filter substrate is adsorbed into a liftable and sealed upper cover. After the upper cover is lowered and sealed, a vacuum chamber is formed. The vacuum pump then removes the air from the chamber. Subsequently, the CF substrate is pressed down and pressed tightly against the sealant on the surface of the TFT substrate. After UV curing, a hollow liquid crystal cell with an arc-shaped notch is obtained. The hollow liquid crystal cell is then removed and placed in a dedicated liquid crystal filling machine for liquid crystal filling.

[0003] In actual production, due to factors such as unstable glue dispensing volume in the arc segment of the circular sealing adhesive, insufficient gap in the adhesive frame, low adhesive viscosity, large glue flow allowance, and uneven force on the annular adhesive ring when the CF is pressed down, the sealing adhesive may overflow and intrude into the effective pixel area. The intruded area will block the pixel light-emitting area, causing black spots, bright spots, partial missing images, and uneven colors. The overflow adhesive will also prevent the pixel electrode from contacting the color filter layer, causing line breakage and pixel failure. At the same time, the overflow adhesive residue is prone to producing bubbles and delamination, reducing the screen's airtightness and lifespan.

[0004] To address this issue, a positioning and pressing device for LCD displays is proposed. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing an alignment and pressing device for an LCD display screen.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a positioning and pressing device for an LCD display screen, comprising a mounting frame, a connecting frame fixedly connected to the upper side wall of the mounting frame, a first electric push rod fixedly connected to the upper side wall of the connecting frame, the moving end of the first electric push rod passing through the connecting frame and fixedly connected to a sealing cover, a curing lamp provided on the inner wall of the sealing cover, a sealing box located below the sealing cover fixedly connected to the upper side wall of the mounting frame, a vacuum pump connected to the lower side wall of the mounting frame, the suction end of the vacuum pump communicating with the sealing box, a pressure relief valve provided on the lower side wall of the sealing box, and further comprising: A negative pressure loading stage assembly is connected to the inner wall of the sealed box, and the TFT substrate is placed on the surface of the negative pressure loading stage assembly; An adsorption assembly is disposed on the side wall of the sealing cover, and the CF color filter substrate is located at the adsorption end of the adsorption assembly. A gas delivery assembly, disposed on the lower side wall of the mounting bracket, delivers inert gas between the TFT substrate and the CF color filter substrate; The processing component is located on the outside of the negative pressure loading stage assembly, so that a tiny gap is formed in the glue overflow area of ​​the TFT substrate and the CF color filter substrate.

[0007] Preferably, the negative pressure loading platform assembly includes a corrective motor fixedly connected to the inner wall of the sealed box, a rotating drum fixedly connected to the output end of the corrective motor, a hollow adsorption platform fixedly connected to the upper side wall of the rotating drum, a plurality of negative pressure holes opened on the upper side wall of the hollow adsorption platform, and rubber rings fixedly connected to the inner wall of the negative pressure holes, and a small negative pressure pump fixedly connected to the side wall of the rotating drum, the suction end of the small negative pressure pump communicating with the hollow adsorption platform.

[0008] Preferably, the adsorption assembly includes a vertical tube fixedly connected to the inner wall of the sealing cover, an air pump fixedly connected to the upper side wall of the sealing cover, the air inlet of the air pump passing through the sealing cover and communicating with the vertical tube, a suction cup fixedly connected to the lower end of the vertical tube, two horizontal tubes fixedly connected to the wall of the vertical tube, the ends of the two horizontal tubes away from the vertical tube fixedly connected to the same annular tube, the lower side wall of the annular tube fixedly connected to the same arc-shaped adsorption head by multiple springs, two first telescopic tubes fixedly connected between the arc-shaped adsorption head and the annular tube, and a lifting frame fixedly connected to the upper side wall of the arc-shaped adsorption head, the lifting frame being made of TPE material.

[0009] Preferably, the arc-shaped adsorption head includes an arc-shaped rubber strip, the inside of which is provided with an air suction chamber, the lower end of the first telescopic tube is connected to the air suction chamber, and the lower side wall of the arc-shaped rubber strip is provided with multiple adsorption ports, which are connected to the air suction chamber.

[0010] Preferably, a disc located below the horizontal pipe is fixedly sleeved on the wall of the vertical pipe, and a first arc guide rail mechanism is connected to the lower side wall of the disc. The moving end of the first arc guide rail mechanism is connected to an inclined visual sensor.

[0011] Preferably, the gas delivery assembly includes a support frame fixedly connected to the lower side wall of the mounting bracket, an inert gas tank connected to the upper side wall of the support frame, an exhaust pipe of the inert gas tank passing through the mounting bracket and the sealing box, and connected to a bend pipe through a second telescopic pipe, a second electric push rod fixedly connected to the inner wall of the sealing box, the moving end of the second electric push rod being connected to the bend pipe through a mounting sleeve, an arc-shaped gas outlet fixedly connected to one end of the bend pipe near the TFT substrate, and a gas nozzle matching the notch of the sealing glue on the surface of the TFT substrate fixedly connected to the side wall of the arc-shaped gas outlet.

[0012] Preferably, the processing component includes a lifting ring sleeved on the outside of the rotating drum. The rotating drum is provided with a threaded drive mechanism, and the moving end of the threaded drive mechanism is fixedly connected to two bent rods. The ends of the two bent rods that are far apart from each other are connected to the lifting ring. The lower side wall of the lifting ring is fixedly connected to a second arc guide rail mechanism. The moving end of the second arc guide rail mechanism is connected to a small electric push rod through an mounting sleeve. The moving end of the small electric push rod is connected to a lifting mechanism.

[0013] Preferably, the lifting mechanism includes a movable plate fixedly connected to the moving end of a small electric push rod. A fixed cylinder is fixedly connected to the upper side wall of the movable plate. A fixed frame is movably inserted into the upper side wall of the fixed cylinder. A spring connects the fixed frame and the fixed cylinder. The upper end of the fixed frame extends out of the fixed cylinder and is fixedly connected to a top plate. A lifting plate is fixedly connected to the side wall of the fixed frame. A lifting port that matches the lifting plate is opened on the side wall of the fixed cylinder. A positioning frame is fixedly connected to the upper side wall of the movable plate. A lever plate is rotatably connected to the inner wall of the positioning frame. A miniature electric push rod is connected to the side wall of the movable plate. An inclined block is fixedly connected to the moving end of the miniature electric push rod. The positioning frame is positioned close to the lifting plate.

[0014] Compared with existing technologies, the advantages of an alignment and pressing device for LCD displays are: 1. This invention, through the configuration of a negative pressure loading stage assembly, an adsorption assembly, and a processing assembly, enables the TFT substrate to be fixed on the surface of the negative pressure loading stage assembly and the CF color filter substrate to be adsorbed onto the adsorption end of the adsorption assembly during the lamination process of the TFT substrate and the CF color filter substrate. A visual sensor can detect areas where the sealant overflows during the vacuum lamination process of the TFT substrate and the CF color filter substrate. Inert gas is then supplied to the sealant gap on the surface of the TFT substrate via a gas supply assembly. The processing assembly lifts the CF color filter substrate in the overflow area to a predetermined height, causing it to bend slightly and create a gap between it and the TFT substrate. Under pressure, the inert gas is extracted through the gap by a vacuum pump. The continuously flowing inert gas generates a viscous shear drag force with the liquid sealant surface, overcoming the cohesive force of the sealant and its tendency to slide inward under pressure. This continuously pushes the overflowing sealant towards the outer edge of the CF color filter substrate. Simultaneously, a pressure barrier is formed between the TFT substrate and the CF color filter substrate, preventing the sealant from flowing into the pixel area.

[0015] 2. This invention, through its lifting mechanism, raises the CF color filter substrate to a set height. A miniature electric push rod drives a ramp block to push the lever plate downwards. The ramp block causes the long arm region of the lever plate to move downwards. Along the hinge with the positioning frame, the lever plate causes the short arm region to push the lifting plate, fixing frame, and top plate upwards. The top plate then pushes the lifting frame upwards. The lifting frame, through an arc-shaped suction head, moves the adhesive overflow area of ​​the CF color filter substrate upwards. The lever mechanism utilizes the reverse characteristic of lever amplification stroke, converting the large downward displacement at the long arm end into a small lifting amount at the short arm end. This significantly reduces the impact of displacement control accuracy deviation at the drive end on the lifting gap of the CF color filter substrate, allowing for precise control of the venting gap size of the slightly curved edge of the CF color filter substrate. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an alignment and pressing device for an LCD display screen provided by the present invention; Figure 2 This is a schematic diagram of the structure after the sealing cap is opened in this invention; Figure 3 This is a schematic diagram of the adsorption component in this invention; Figure 4 This is a schematic diagram of the surface structure of the vertical tube in this invention; Figure 5 This is a schematic diagram of the arc-shaped adsorption head in this invention; Figure 6 This is a schematic diagram showing the positional relationship between the disk and the horizontal tube in this invention; Figure 7 This is a schematic diagram showing the position of the visual sensor in this invention; Figure 8 This is a schematic diagram of the internal structure of the sealed box in this invention; Figure 9 This is a schematic diagram of the processing component in this invention; Figure 10 This is a schematic diagram of the lifting mechanism in this invention; Figure 11 This is a schematic diagram of the surface structure of the hollow adsorption stage in this invention; Figure 12 This is a schematic diagram showing the positions of the arc-shaped air outlet and the air nozzle in this invention; Figure 13 This is a schematic diagram of the internal structure of the fixed cylinder in this invention.

[0017] In the diagram: 1. Mounting frame, 2. Connecting frame, 3. First electric push rod, 4. Sealing cover, 5. Sealing box, 6. Vacuum pump, 7. Negative pressure loading platform assembly, 71. Correction motor, 72. Rotary drum, 8. Hollow adsorption platform, 9. Rubber ring, 10. Small negative pressure pump, 11. Adsorption assembly, 111. Vertical pipe, 112. Evacuator, 12. Suction cup, 13. Horizontal pipe, 14. Annular pipe, 15. First telescopic pipe, 16. Lifting frame, 17. Arc-shaped adsorption head, 171. Arc-shaped rubber belt, 172. Suction chamber, 18. Adsorption port, 19. Disc, 20. First arc-shaped guide rail mechanism, 21. 22 Vision sensor, 22 Gas delivery assembly, 221 Support frame, 222 Inert gas tank, 23 Second telescopic pipe, 24 Bend, 25 Second electric push rod, 26 Arc-shaped air outlet, 27 Air outlet nozzle, 28 Processing assembly, 281 Lifting ring, 282 Bend rod, 29 Second arc guide rail mechanism, 30 Small electric push rod, 31 Lifting mechanism, 311 Moving plate, 312 Fixed cylinder, 32 Fixed frame, 33 Top plate, 34 Lifting plate, 35 Positioning frame, 36 Bar plate, 37 Miniature electric push rod, 38 Inclined block, 39 Exhaust pipe. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0019] Reference Figures 1-3 An alignment and pressing device for an LCD display includes a mounting frame 1, a connecting frame 2 fixedly connected to the upper side wall of the mounting frame 1, a first electric push rod 3 fixedly connected to the upper side wall of the connecting frame 2, the moving end of the first electric push rod 3 passing through the connecting frame 2 and fixedly connected to a sealing cover 4, a curing lamp provided on the inner wall of the sealing cover 4, a sealing box 5 located below the sealing cover 4 fixedly connected to the upper side wall of the mounting frame 1, a vacuum pump 6 connected to the lower side wall of the mounting frame 1, the suction end of the vacuum pump 6 communicating with the sealing box 5, and a pressure relief valve provided on the lower side wall of the sealing box 5.

[0020] Reference Figures 8-11 Furthermore, in this embodiment, the negative pressure loading stage assembly 7 is connected to the inner wall of the sealed box 5, and the TFT substrate is placed on the surface of the negative pressure loading stage assembly 7. The negative pressure loading stage assembly 7 includes a correction motor 71 fixedly connected to the inner wall of the sealed box 5. The output end of the correction motor 71 is fixedly connected to a rotating drum 72. A hollow adsorption stage 8 is fixedly connected to the upper side wall of the rotating drum 72. The upper side wall of the hollow adsorption stage 8 is provided with multiple negative pressure holes, and a rubber ring 9 is fixedly connected to the inner wall of the negative pressure holes. A small negative pressure pump 10 is fixedly connected to the side wall of the rotating drum 72. The suction end of the small negative pressure pump 10 is connected to the hollow adsorption stage 8.

[0021] During operation, the external robotic arm places the TFT substrate at a suitable position on the surface of the hollow adsorption stage 8. Then, the external controller controls the small negative pressure pump 10 to work. The small negative pressure pump 10 discharges the gas inside the hollow adsorption stage 8, and the negative pressure causes the TFT substrate to be adsorbed onto the surface of the rubber ring 9.

[0022] Reference Figure 1 , Figures 10-12 Furthermore, in this embodiment, the gas delivery component 22 is disposed on the lower side wall of the mounting frame 1 to deliver inert gas between the TFT substrate and the CF color filter substrate. The gas delivery component 22 includes a support frame 221 fixedly connected to the lower side wall of the mounting frame 1. An inert gas tank 222 is connected to the upper side wall of the support frame 221. The exhaust pipe 39 of the inert gas tank 222 passes through the mounting frame 1 and the sealing box 5, and is connected to a bend pipe 24 through a second telescopic pipe 23. A second electric push rod 25 is fixedly connected to the inner wall of the sealing box 5. The moving end of the second electric push rod 25 is connected to the bend pipe 24 through the mounting sleeve. An arc-shaped gas outlet 26 is fixedly connected to one end of the bend pipe 24 near the TFT substrate. An outlet nozzle 27 matching the notch of the sealing glue on the surface of the TFT substrate is fixedly connected to the side wall of the arc-shaped gas outlet 26.

[0023] During operation, after the TFT substrate is adsorbed onto the surface of the rubber ring 9, the external controller observes the position of the notch in the sealing glue on the surface of the TFT substrate through the monitoring probe on the sealing cover 4. The controller then drives the rotating drum 72, the hollow adsorption stage 8, and the TFT substrate to rotate together to the appropriate position through the correction motor 71, so that the notch is aligned with the vent nozzle 27. Subsequently, the controller controls the second electric push rod 25 to move the bent tube 24. The bent tube 24 will move the arc-shaped vent head 26 and the vent nozzle 27, so that the vent nozzle 27 is inserted into the notch. By opening the valve in the exhaust pipe 39, the inert gas in the inert gas tank 222 is delivered to the notch in the TFT substrate through the exhaust pipe 39, the second telescopic tube 23, the bent tube 24, the arc-shaped vent head 26, and the vent nozzle 27.

[0024] Reference Figures 3-7Furthermore, in this embodiment, the device also includes an adsorption assembly 11 disposed on the side wall of the sealing cover 4. The CF color filter substrate is located at the adsorption end of the adsorption assembly 11. The adsorption assembly 11 includes a vertical tube 111 fixedly connected to the inner wall of the sealing cover 4. An air pump 112 is fixedly connected to the upper side wall of the sealing cover 4. The air inlet of the air pump 112 passes through the sealing cover 4 and communicates with the vertical tube 111. A suction cup 12 is fixedly connected to the lower end of the vertical tube 111. Two horizontal tubes 13 are fixedly connected to the wall of the vertical tube 111. The ends of the two horizontal tubes 13 away from the vertical tube 111 are fixedly connected to the same annular tube 14. The lower side wall of the annular tube 14 is fixedly connected to the same arc-shaped adsorption head 17 by multiple springs. The arc-shaped adsorption head 17 and the annular tube 14 are connected to the same annular tube 14. Two first telescopic tubes 15 are fixedly connected between the tubes 14. A lifting frame 16 is fixedly connected to the upper side wall of the arc-shaped suction head 17. The lifting frame 16 is made of TPE material and has an arc-shaped structure. The arc-shaped suction head 17 includes an arc-shaped rubber belt 171. An air suction chamber 172 is opened inside the arc-shaped rubber belt 171. The lower end of the first telescopic tube 15 is connected to the air suction chamber 172. Multiple suction ports 18 are opened on the lower side wall of the arc-shaped rubber belt 171. The suction ports 18 are connected to the air suction chamber 172. A disc 19 located below the horizontal tube 13 is fixedly sleeved on the wall of the vertical tube 111. A first arc-shaped guide rail mechanism 20 is connected to the lower side wall of the disc 19. An inclined visual sensor 21 is connected to the moving end of the first arc-shaped guide rail mechanism 20.

[0025] During operation, the external robotic arm places the CF color filter substrate at a suitable position below the suction cup 12, and makes the arc-shaped suction head 17 contact the side wall of the CF color filter substrate near the edge. Then, the external controller controls the vacuum pump 112 to work, and the vacuum pump 112 extracts the gas inside the vertical tube 111. The gas inside the suction cup 12 and the arc-shaped suction head 17 is also extracted. Under negative pressure, the suction cup 12 will adsorb and fix the central area of ​​the CF color filter substrate, and the arc-shaped suction head 17 will adsorb and fix the side wall of the CF color filter substrate near the edge. Finally, the controller controls the sealing cover 4 to move downward and fit and seal with the sealing box 5, and controls the vacuum pump 6 to extract the gas inside the sealing box 5. At the same time, the sealing cover 4 drives the CF color filter substrate to press against the TFT substrate below through the vertical tube 111 and the suction cup 12. During the pressing process of the CF color filter substrate and the TFT substrate, the controller drives the vision sensor 21 through the first arc guide rail mechanism 20 to detect whether there is any glue overflow between the CF color filter substrate and the TFT substrate.

[0026] Reference Figures 8-10 , Figure 13Furthermore, in this embodiment, the device also includes a processing component 28, disposed outside the negative pressure loading stage assembly 7, to create a small gap between the TFT substrate and the CF color filter substrate in the area of ​​excess adhesive. The processing component 28 includes a lifting ring 281 sleeved on the outside of the rotating drum 72. The rotating drum 72 is provided with a threaded drive mechanism, and the moving end of the threaded drive mechanism is fixedly connected to two bent rods 282. The ends of the two bent rods 282 that are far apart from each other are both connected to the lifting ring 281. A second arc guide rail mechanism 29 is fixedly connected to the lower side wall of the lifting ring 281. The moving end of the second arc guide rail mechanism 29 is connected to a small electric push rod 30 through a mounting sleeve. The moving end of the small electric push rod 30 is connected to a lifting mechanism 31. The lifting mechanism 31 includes a small electric push rod 30 fixedly connected to the small electric push rod 30. The moving end of the rod 30 has a moving plate 311. A fixed cylinder 312 is fixedly connected to the upper side wall of the moving plate 311. A fixed frame 32 is movably inserted into the upper side wall of the fixed cylinder 312. A spring is connected between the fixed frame 32 and the fixed cylinder 312. The upper end of the fixed frame 32 extends out of the fixed cylinder 312 and is fixedly connected to a top plate 33. A lifting plate 34 is fixedly connected to the side wall of the fixed frame 32. The side wall of the fixed cylinder 312 has a lifting port that is compatible with the lifting plate 34. A positioning frame 35 is fixedly connected to the upper side wall of the moving plate 311. A lever plate 36 is rotatably connected to the inner wall of the positioning frame 35. A miniature electric push rod 37 is connected to the side wall of the moving plate 311. An inclined block 38 is fixedly connected to the moving end of the miniature electric push rod 37. The positioning frame 35 is located close to the lifting plate 34.

[0027] During operation, when the controller detects excess adhesive between the TFT substrate and the CF color filter substrate via the vision sensor 21, the controller will control the gas delivery component 22 to deliver inert gas between the TFT substrate and the CF color filter substrate through the notch, forming a pressure barrier to prevent the sealant from continuing to flow into the pixel area. Simultaneously, the controller controls the threaded drive mechanism inside the rotating drum 72 (the threaded drive mechanism includes a motor connected inside the rotating drum 72, a threaded rod connected to the motor's output end, a threaded cylinder threaded onto the rod wall, and two bent rods 282 connected to both sides of the threaded cylinder; when the motor drives the threaded rod to rotate...). Through threaded engagement, the threaded cylinder and bent rod 282 move, causing the bent rod 282 and lifting ring 281 to move downwards to a suitable position (the lifting ring 281 initially remains horizontal with the hollow adsorption stage 8, supporting the outer edge of the TFT substrate). Under appropriate pressure from above, the outer edges of the TFT substrate and CF color filter substrate will be suspended and slightly deformed downwards. Subsequently, the controller drives the small electric push rod 30 to one side of the overflow area via the second arc guide rail mechanism 29, and controls the small electric push rod 30 to work. The small electric push rod 30 drives the top plate 33 to move via the moving plate 311. The frame 16 moves to the area below the overflow adhesive region. The controller then activates the micro-electric push rod 37, which moves the inclined block 38 towards the long lever arm end of the lever plate 36. Through the sliding contact of the inclined surface below the inclined block 38, the long lever arm end of the lever plate 36 is pressed downwards, causing it to move downwards. The lever plate 36, along its hinge with the positioning frame 35, pushes the lifting plate 34, the fixing frame 32, and the top plate 33 upwards. The top plate 33 then pushes the frame 16 upwards. The frame 16, through the arc-shaped suction head 17, moves the overflow adhesive region of the CF color filter substrate upwards. The lever mechanism utilizes the reverse characteristic of lever amplification stroke. The large downward displacement at the long lever arm end is converted into a small lifting amount at the short lever arm end. This can significantly reduce the impact of the displacement control accuracy deviation at the drive end on the lifting gap of the CF color filter substrate. It can precisely control the size of the exhaust gap where the edge of the CF color filter substrate is slightly curved and opened. The inert gas in the TFT substrate and CF color filter substrate is discharged through the gap. The continuously flowing inert gas generates a viscous shear drag force with the surface of the liquid sealant, thereby overcoming the cohesive force of the sealant itself and the tendency to slide inward under pressure, and continuously pushing the overflowing sealant to spread to the outer ring of the CF color filter substrate.

[0028] The operating principle of the present invention is explained as follows: The TFT substrate and CF color filter substrate are placed on the surfaces of the negative pressure loading stage assembly 7 and the adsorption assembly 11 by an external robotic arm, and the negative pressure loading stage assembly 7 is controlled to rotate the TFT substrate to a suitable position so that the notch of the sealing glue on the surface of the TFT substrate is aligned with the air outlet 27. Then the controller controls the second electric push rod 25 to drive the arc-shaped air outlet head 26 and the air outlet 27 to insert into the notch through the bend tube 24. Next, the controller controls the first electric push rod 3 to work. The first electric push rod 3 drives the CF color filter substrate to move downward through the sealing cover 4, the vertical tube 111, the suction cup 12 and the arc-shaped suction head 17, so that the sealing cover 4 and the sealing box 5 are closed. Then, the controller controls the vacuum pump 6 to extract the gas inside the sealing box 5, and the CF color filter substrate will move downward and press against the TFT substrate. At the same time, the controller drives the vision sensor 21 to rotate through the first arc guide rail mechanism 20 to detect the glue overflow area between the TFT substrate and the CF color filter substrate. When the glue overflow area is detected, the inert gas is delivered to the space between the TFT substrate and the CF color filter substrate through the gas delivery component 22, and the glue overflow area is opened by the processing component 28 and the lifting mechanism 31 to allow the inert gas to be discharged. The drag force generated when the inert gas is discharged pushes the inward overflowing sealant to spread outward. After the sealant has cured, the controller will control the second electric push rod 25 to drive the vent nozzle 27 out of the notch. The gas between the TFT substrate and the CF color filter substrate will be extracted under the negative pressure inside the sealed box 5. After the sealed box 5 returns to normal pressure, the hollow liquid crystal cell composed of the TFT substrate and the CF color filter substrate can be taken out and placed in a special liquid crystal filling machine to fill the liquid crystal.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A positioning and pressing device for an LCD display screen, comprising a mounting frame (1), a connecting frame (2) fixedly connected to the upper side wall of the mounting frame (1), a first electric push rod (3) fixedly connected to the upper side wall of the connecting frame (2), the moving end of the first electric push rod (3) passing through the connecting frame (2) and fixedly connected to a sealing cover (4), a curing lamp provided on the inner wall of the sealing cover (4), a sealing box (5) located below the sealing cover (4) fixedly connected to the upper side wall of the mounting frame (1), a vacuum pump (6) connected to the lower side wall of the mounting frame (1), the suction end of the vacuum pump (6) communicating with the sealing box (5), and a pressure relief valve provided on the lower side wall of the sealing box (5), characterized in that, Also includes: The negative pressure loading stage assembly (7) is connected to the inner wall of the sealed box (5), and the TFT substrate is placed on the surface of the negative pressure loading stage assembly (7); An adsorption assembly (11) is disposed on the side wall of the sealing cover (4), and the CF color filter substrate is located at the adsorption end of the adsorption assembly (11). Gas delivery assembly (22) is disposed on the lower side wall of the mounting bracket (1) and delivers inert gas between the TFT substrate and the CF color filter substrate; The processing component (28) is disposed on the outside of the negative pressure loading stage assembly (7) to form a small gap between the TFT substrate and the CF color filter substrate in the area of ​​excess adhesive.

2. The alignment and pressing device for an LCD display screen according to claim 1, characterized in that, The negative pressure loading platform assembly (7) includes a correction motor (71) fixedly connected to the inner wall of the sealed box (5). The output end of the correction motor (71) is fixedly connected to a rotating drum (72). The upper side wall of the rotating drum (72) is fixedly connected to a hollow adsorption platform (8). The upper side wall of the hollow adsorption platform (8) is provided with multiple negative pressure holes, and the inner wall of the negative pressure holes is fixedly connected to a rubber ring (9). The side wall of the rotating drum (72) is fixedly connected to a small negative pressure pump (10). The suction end of the small negative pressure pump (10) is connected to the hollow adsorption platform (8).

3. The alignment and pressing device for an LCD display screen according to claim 1, characterized in that, The adsorption assembly (11) includes a vertical tube (111) fixedly connected to the inner wall of the sealing cover (4). An air pump (112) is fixedly connected to the upper side wall of the sealing cover (4). The air inlet of the air pump (112) passes through the sealing cover (4) and is connected to the vertical tube (111). A suction cup (12) is fixedly connected to the lower end of the vertical tube (111). Two horizontal tubes (13) are fixedly connected to the wall of the vertical tube (111). The ends of the two horizontal tubes (13) away from the vertical tube (111) are fixedly connected to the same annular tube (14). The lower side wall of the annular tube (14) is fixedly connected to the same arc-shaped adsorption head (17) by multiple springs. Two first telescopic tubes (15) are fixedly connected between the arc-shaped adsorption head (17) and the annular tube (14). A lifting frame (16) is fixedly connected to the upper side wall of the arc-shaped adsorption head (17). The lifting frame (16) is made of TPE material.

4. The alignment and pressing device for an LCD display screen according to claim 3, characterized in that, The arc-shaped adsorption head (17) includes an arc-shaped rubber belt (171), and an air suction chamber (172) is provided inside the arc-shaped rubber belt (171). The lower end of the first telescopic tube (15) is connected to the air suction chamber (172). Multiple adsorption ports (18) are provided on the lower side wall of the arc-shaped rubber belt (171), and the adsorption ports (18) are connected to the air suction chamber (172).

5. The alignment and pressing device for an LCD display screen according to claim 3, characterized in that, The vertical tube (111) has a fixed sleeve on the wall of a disc (19) located below the horizontal tube (13). The lower side wall of the disc (19) is connected to a first arc guide rail mechanism (20), and the moving end of the first arc guide rail mechanism (20) is connected to an inclined visual sensor (21).

6. The alignment and pressing device for an LCD display screen according to claim 1, characterized in that, The gas delivery assembly (22) includes a support frame (221) fixedly connected to the lower side wall of the mounting frame (1). An inert gas tank (222) is connected to the upper side wall of the support frame (221). The exhaust pipe (39) of the inert gas tank (222) passes through the mounting frame (1) and the sealing box (5), and is connected to a bend pipe (24) through a second telescopic pipe (23). A second electric push rod (25) is fixedly connected to the inner wall of the sealing box (5). The moving end of the second electric push rod (25) is connected to the bend pipe (24) through the mounting sleeve. An arc-shaped gas outlet (26) is fixedly connected to one end of the bend pipe (24) near the TFT substrate. An outlet nozzle (27) matching the notch of the sealing glue on the surface of the TFT substrate is fixedly connected to the side wall of the arc-shaped gas outlet (26).

7. The alignment and pressing device for an LCD display screen according to claim 2, characterized in that, The processing component (28) includes a lifting ring (281) sleeved on the outside of the rotating drum (72). The rotating drum (72) is provided with a threaded drive mechanism, and the moving end of the threaded drive mechanism is fixedly connected to two bent rods (282). The ends of the two bent rods (282) that are far apart from each other are connected to the lifting ring (281). The lower side wall of the lifting ring (281) is fixedly connected to a second arc guide rail mechanism (29). The moving end of the second arc guide rail mechanism (29) is connected to a small electric push rod (30) through an installation sleeve. The moving end of the small electric push rod (30) is connected to a lifting mechanism (31).

8. The alignment and pressing device for an LCD display screen according to claim 7, characterized in that, The lifting mechanism (31) includes a movable plate (311) fixedly connected to the movable end of a small electric push rod (30). A fixed cylinder (312) is fixedly connected to the upper side wall of the movable plate (311). A fixed frame (32) is movably inserted into the upper side wall of the fixed cylinder (312). A spring is connected between the fixed frame (32) and the fixed cylinder (312). The upper end of the fixed frame (32) extends out of the fixed cylinder (312) and is fixedly connected to a top plate (33). The side wall of the fixed frame (32) is fixed. A lifting plate (34) is connected to the fixed cylinder (312), and a lifting port that is compatible with the lifting plate (34) is opened on the side wall of the moving plate (311). A positioning frame (35) is fixedly connected to the upper side wall of the moving plate (311). A lever plate (36) is rotatably connected to the inner wall of the positioning frame (35). A miniature electric push rod (37) is connected to the side wall of the moving plate (311). An inclined block (38) is fixedly connected to the moving end of the miniature electric push rod (37). The positioning frame (35) is set close to the lifting plate (34).

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