OLED display screen packaging equipment and packaging method

Abstract

The invention relates to the technical field of display screen packaging, in particular to OLED display screen packaging equipment and packaging method.The OLED display screen packaging equipment comprises a packaging machine body and a bearing table fixed in the packaging machine body, a translation assembly is arranged in the packaging machine body and comprises a connecting plate, and a storage box is fixed to the upper side of the connecting plate; the buffer pipe is fixed to the lower side of the connecting plate, a conveying pipe communicated with the material storage box is connected to the buffer pipe, a conveying groove is formed in the outer wall of the buffer pipe, and a coating assembly is arranged on the buffer pipe; the conveying assembly is arranged on the conveying pipe and used for conveying the solution in the storage box into the buffer pipe; and the pressurization regulation and control mechanism is arranged in the buffer pipe, a plugging plate is connected to the pressurization regulation and control mechanism, a follow-up regulation mechanism is arranged on the buffer pipe, and the conduction state of the conveying pipe is regulated in a self-adaptive mode through the change of the pressure intensity in the buffer pipe, so that the pressure fluctuation during coating is reduced, and stable coating is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of display screen packaging, and specifically to an OLED display screen packaging device and a packaging method. Background Art

[0002] The flexible OLED display screen is based on OLED (organic light-emitting diode) technology, and its basic structure is "flexible substrate / ITO anode / organic functional layer / metal cathode", and the organic light-emitting material emits light through current drive. Compared with traditional LCDs, OLEDs do not require a backlight and a liquid crystal layer, so they can achieve a thinner thickness and a higher contrast.

[0003] When packaging the display screen, thin film packaging, glass or metal cover plate packaging, composite packaging, etc. are usually used. Thin film packaging is one of the most commonly used packaging methods for flexible OLED display screens. It forms a multi-layer thin film structure by alternately stacking organic layers and inorganic layers to block the penetration of water vapor and oxygen.

[0004] Organic packaging is usually realized by spin coating or inkjet printing. In terms of spin coating, during the spin coating process, more than 90% of the material is thrown out of the substrate due to the centrifugal force, resulting in waste, especially for expensive OLED organic materials, the cost is high.

[0005] However, during the slot coating process, if there is a pressure fluctuation in the liquid supply system, the coating pressure will also change accordingly, resulting in a fluctuation in the coating liquid flow rate, and then coating defects such as horizontal stripes, vertical stripes, and bubbles will appear during the coating process. Summary of the Invention

[0006] The purpose of the present invention is to provide an OLED display screen packaging device and a packaging method to solve the problems raised in the above background art.

[0007] To achieve the above purpose, the present invention provides the following technical solutions:

[0008] An OLED display screen packaging device includes:

[0009] A packaging machine body, and a carrier table fixed in the packaging machine body. A translation component is arranged in the packaging machine body. The translation component includes a connection plate, and a storage tank is fixed on the upper side of the connection plate;

[0010] It further includes:

[0011] A buffer tube fixed on the lower side of the connection plate. A delivery tube connected to the storage tank is connected to the buffer tube. A delivery groove is formed on the outer wall of the buffer tube, and a coating component is arranged on the buffer tube;

[0012] A conveying assembly is arranged on the conveying pipe and is used to convey the solution in the storage tank into the buffer pipe.

[0013] A pressure boosting and regulating mechanism is arranged in the buffer pipe. A sealing plate is connected to the pressure boosting and regulating mechanism. A follow-up regulating mechanism connected to the pressure boosting and regulating mechanism is arranged on the buffer pipe. The pressure boosting and regulating mechanism can adjust the conduction state of the conveying groove through the sealing plate, and the pressure boosting and regulating mechanism can also adjust the conduction amount of the conveying pipe through the follow-up regulating mechanism and the conveying assembly.

[0014] As a further scheme of the present invention: The pressure boosting and regulating mechanism includes a first rotating rod rotatably installed in the buffer pipe. The first rotating rod is fixedly connected to the sealing plate. Symmetrically arranged guiding grooves and inclined grooves are formed on the outer wall of the first rotating rod. A guiding assembly is arranged in the buffer pipe.

[0015] As a further scheme of the present invention: The guiding assembly includes a support column fixedly installed in the buffer pipe. A piston disk and a movable plate that are slidably connected to the first rotating rod are slidably installed on the support column. A first limiting block that is slidably fitted with the guiding groove is fixed on the inner wall of the piston disk. A second limiting block that is slidably fitted with the inclined groove is fixed on the inner wall of the movable plate.

[0016] As a further scheme of the present invention: The guiding assembly further includes a first spring and a second spring sleeved on the first rotating rod. Two ends of the first spring respectively abut against the movable plate and the piston disk. Two ends of the second spring respectively abut against the movable plate and the inner wall of the buffer pipe.

[0017] As a further scheme of the present invention: The follow-up regulating mechanism includes a second rotating rod rotatably installed at the end of the buffer pipe. A guiding groove is formed on the circumferential outer wall of the second rotating rod. A movable rod penetrating the buffer pipe is fixed on the piston disk. A second limiting column that is slidably fitted with the guiding groove is fixed at the end of the movable rod. A driven assembly is arranged on the buffer pipe.

[0018] As a further scheme of the present invention: The driven assembly includes a first bevel gear fixed on the second rotating rod. A third rotating rod is rotatably installed on the buffer pipe. A second bevel gear meshing with the first bevel gear is fixed on the third rotating rod.

[0019] As a further scheme of the present invention: The driven assembly further includes a rotating sleeve rotatably installed on the conveying pipe. A belt connected to the third rotating rod is sleeved on the rotating sleeve. A first spiral groove is formed on the outer wall of the rotating sleeve.

[0020] As a further solution of the present invention: The conveying assembly includes a partition fixed on the conveying pipe. Through grooves symmetrically arranged up and down are formed on the outer wall of the conveying pipe. A hollow pipe in sliding connection with the through grooves is installed on the conveying pipe in a sliding manner. A first limiting post slidably connected to the first spiral groove is fixed on the hollow pipe.

[0021] As a further solution of the present invention: The coating assembly includes a slit coating head fixedly installed on the buffer pipe. A feeding groove in conduction cooperation with the conveying groove is formed in the slit coating head. Sealing plates arranged symmetrically are installed in the slit coating head in a sliding manner. A clamping groove is formed on the sealing plate. A slit plate slidably fitted with the clamping groove is fixed on the sealing plate.

[0022] An OLED display encapsulation method includes the following steps:

[0023] Step 1: Place the display screen to be encapsulated on the bearing platform;

[0024] Step 2: The coating liquid in the storage tank is conveyed into the buffer pipe through the conveying pipe and the conveying assembly. Under the action of pressure, the pressure boosting and regulating mechanism is controlled to move;

[0025] Step 3: When the pressure in the buffer pipe reaches a certain level, under the action of the pressure boosting and regulating mechanism, the conveying groove is controlled to be in a conducting state through the blocking plate, and the coating liquid is conveyed into the coating assembly to perform a coating treatment on the display screen;

[0026] Step 4: The pressure boosting and regulating mechanism will also drive the follow-up regulating mechanism to move, so as to adjust the conduction amount of the conveying pipe through the conveying assembly.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows: This application can precisely control the conveying rate and discharge rate of the coating liquid by adjusting the pressure in the buffer pipe, so as to avoid poor phenomena such as horizontal and vertical stripes in the coating process of the organic layer. Specifically, when the display screen is placed on the bearing platform, the organic layer coating liquid in the storage tank can be conveyed into the buffer pipe through the conveying assembly and the conveying pipe. As the coating liquid increases, the pressure in the buffer pipe increases, thereby driving the pressure boosting and regulating mechanism to move. When the pressure in the buffer pipe reaches the set value, the pressure boosting and regulating mechanism will drive the blocking plate to move, making the conveying groove conductive. At this time, the coating liquid will enter the coating assembly through the conveying groove and be conveyed to the surface of the display screen. Under the action of the translation assembly, the coating assembly is controlled to move along the length direction of the display screen to perform an organic layer coating treatment on the display screen. The pressure boosting and regulating mechanism will also drive the follow-up regulating mechanism to move, so as to adjust the conduction amount of the conveying pipe through the conveying assembly to ensure that the conveying rate of the storage tank is balanced with the discharge rate of the coating liquid.

[0028] When the pressure in the buffer tube changes, the position of the piston disc will change correspondingly. With the cooperation of the first limit block and the guide groove, it can be ensured that it remains in a sealed state before the pressure in the buffer tube reaches the set value, thus effectively preventing the coating liquid from flowing out prematurely under unstable pressure and avoiding adverse effects on the coating quality of the organic layer.

[0029] Through the cooperation of the second limit post and the second spiral groove, when the pressure in the buffer tube approaches the set value, the conduction amount of the through groove is synchronously reduced, thereby effectively reducing the conveying rate of the conveying tube and precisely controlling the pressure change in the buffer tube. As this process progresses, until the pressure in the buffer tube stably reaches the set value, at this time the conveying rate of the conveying tube is also adjusted to the preset reasonable value and matches the discharge rate of the conveying groove, reducing the possible pressure fluctuations during the coating process from the source and providing a strong guarantee for the improvement of the coating quality of the organic layer, ensuring that the quality reaches the best state when coating the organic layer of the display screen.

[0030] When the pumping of the coating liquid fluctuates and causes an abnormal increase in the pumping volume, the buffer tube can play its buffering role, effectively limiting the rising amplitude of the pressure in the buffer tube and avoiding serious impacts on the coating process due to a sharp rise in pressure. At the same time, under the combined action of the second limit post and the second spiral groove again, the conduction amount of the through groove will further decrease, and by reducing the conveying rate of the conveying tube, the pressure in the buffer tube is actively reduced until the pressure in the buffer tube drops back to the set range, and the conveying rate of the conveying tube also returns to the set value. The whole process does not require frequent manual intervention, realizing automatic and intelligent precise regulation. Description of the Drawings

[0031] Figure 1 It is a schematic structural diagram of an embodiment of an OLED display screen encapsulation device.

[0032] Figure 2 It is a schematic cross-sectional structure diagram of the encapsulation body in an embodiment of an OLED display screen encapsulation device.

[0033] Figure 3 It is a schematic structural diagram inside the encapsulation body in an embodiment of an OLED display screen encapsulation device.

[0034] Figure 4 It is a schematic connection diagram of the conveying component, buffer tube, and follow-up adjustment mechanism in an embodiment of an OLED display screen encapsulation device.

[0035] Figure 5 For Figure 4 A schematic structural diagram from another angle.

[0036] Figure 6 For Figure 5 An enlarged schematic structural diagram at position A in

[0037] Figure 7 It is a schematic structural diagram of a pressure boosting control mechanism in an embodiment of an OLED display screen encapsulation device.

[0038] Figure 8 It is an exploded structural diagram of a part of the pressure boosting control mechanism in an embodiment of an OLED display screen encapsulation device.

[0039] Figure 9 It is a schematic structural diagram of a first rotating rod, a guiding groove, and an inclined groove in an embodiment of an OLED display screen encapsulation device.

[0040] Figure 10 It is an exploded structural diagram of a conveying component and a conveying pipe in an embodiment of an OLED display screen encapsulation device.

[0041] Figure 11 It is an exploded structural diagram of a slit coating component in an embodiment of an OLED display screen encapsulation device.

[0042] Figure 12 It is an exploded structural diagram of a part of a follow-up adjustment mechanism in an embodiment of an OLED display screen encapsulation device.

[0043] In the figure: 1. Encapsulation body; 2. Carrying platform; 3. Lead screw; 4. Threaded sleeve; 5. Connecting plate; 6. Guide post; 7. Guide sleeve; 8. Storage tank; 9. Buffer pipe; 901. Conveying groove; 10. Slit coating head; 1001. Feeding groove; 11. Sealing plate; 1101. Card slot; 12. Slit plate; 13. Conveying pipe; 1301. Partition plate; 1302. Through groove; 14. Hollow pipe; 1401. First limit post; 15. Rotating sleeve; 1501. First spiral groove; 16. First rotating rod; 1601. First straight groove; 1602. First annular groove; 1603. Second straight groove; 1604. Second annular groove; 1605. Inclined groove; 17. Support column; 18. Piston disk; 1801. First limit block; 19. Sliding sleeve; 20. Movable plate; 2001. Second limit block; 21. First spring; 22. Second spring; 23. Plugging plate; 24. Movable rod; 25. Second limit post; 26. Second rotating rod; 2601. Horizontal groove; 2602. Second spiral groove; 27. First bevel gear; 28. Third rotating rod; 29. Second bevel gear; 30. Belt. Detailed implementation manners

[0044] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0045] In addition, the elements in the present invention are referred to as "fixed to" or "disposed on" another element, and it can be directly on another element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation manner.

[0046] Please refer to Figures 1 to 12 , in the embodiment of the present invention, an OLED display packaging device includes:

[0047] A packaging body 1, and a carrier table 2 fixed in the packaging body 1. A translation assembly is provided in the packaging body 1. The translation assembly includes a connecting plate 5. A storage box 8 is fixed on the upper side of the connecting plate 5. The translation assembly includes a lead screw 3 rotatably installed in the packaging body 1. A threaded sleeve 4 is threadedly connected to the lead screw 3. A guide post 6 is fixed in the packaging body 1. A guide sleeve 7 is slidably installed on the guide post 6. The guide sleeve 7 and the threaded sleeve 4 are fixed to the connecting plate 5;

[0048] Among them, the above-mentioned guide post 6 can also be replaced by a lead screw 3, that is, two lead screws 3 are used to achieve synchronous driving on both sides so that the whole mechanism is evenly stressed during movement to achieve the effect of stable operation.

[0049] It further includes:

[0050] A buffer tube 9, fixed to the lower side of the connecting plate 5. A delivery tube 13 communicating with the storage box 8 is connected to the buffer tube 9. A delivery groove 901 is formed on the outer wall of the buffer tube 9. A coating assembly is provided on the buffer tube 9;

[0051] A delivery assembly, provided on the delivery tube 13, for delivering the solution in the storage box 8 into the buffer tube 9;

[0052] The pressure boosting control mechanism is arranged inside the buffer pipe 9. A sealing plate 23 is connected to the pressure boosting control mechanism. A follow-up adjustment mechanism connected to the pressure boosting control mechanism is arranged on the buffer pipe 9. The pressure boosting control mechanism can adjust the conduction state of the conveying groove 901 through the sealing plate 23. The pressure boosting control mechanism can also adjust the conduction amount of the conveying pipe 13 through the follow-up adjustment mechanism and the conveying assembly.

[0053] Specifically, for the encapsulation of the display screen, it is necessary to alternately coat the inorganic layer and the organic layer on the surface of the display screen. When encapsulating the display screen, the display screen can be placed on the carrier table 2, and the inorganic layer is coated. At the same time, the organic layer coating liquid in the storage tank 8 can be transported to the buffer pipe 9 through the conveying assembly and the conveying pipe 13. As the coating liquid increases, the pressure inside the buffer pipe 9 increases, thereby driving the movement of the pressure boosting control mechanism. When the pressure inside the buffer pipe 9 reaches the set value, the pressure boosting control mechanism will drive the sealing plate 23 to move, so that the conveying groove 901 is conducted. At this time, the coating liquid will enter the coating assembly through the conveying groove 901 and be transported to the surface of the display screen. Under the action of the translation assembly, the coating assembly is controlled to move along the length direction of the display screen to perform the organic layer coating treatment on the display screen. The pressure boosting control mechanism will also drive the follow-up adjustment mechanism to move to adjust the conduction amount of the conveying pipe 13 through the conveying assembly, ensuring that the conveying rate of the storage tank 8 is balanced with the discharge rate of the coating liquid. When the conveying of the coating liquid in the storage tank 8 fluctuates, the pressure boosting control mechanism can respond in time and play a role. Through effective control means, the pressure fluctuation inside the buffer pipe 9 is significantly reduced, avoiding the adverse impact on the subsequent coating process caused by large pressure fluctuations. At the same time, the pressure boosting control mechanism will accurately control the follow-up adjustment mechanism to perform corresponding movements, and the follow-up adjustment mechanism will then adjust the conduction amount of the conveying pipe 13 through the conveying assembly to realize the dynamic adjustment of the conveying amount of the coating liquid. The whole process cooperates with each other and works synergistically to ensure that the pressure inside the buffer pipe 9 is always maintained within a certain set range, effectively suppressing the interference of pressure fluctuations on the coating quality, ensuring the uniformity and accuracy of the coating to the greatest extent, and making the coating quality reach the best state. Among them, the coating liquid in the storage tank 8 can be transported into the conveying pipe 13 by means of pumping, which is the application of the prior art and will not be elaborated in this application.

[0054] Please refer to Figure 1 、 Figure 2 、 Figures 7 - 9, the pressure boosting and regulating mechanism includes a first rotating rod 16 rotatably installed in the buffer tube 9. The first rotating rod 16 is fixedly connected to the sealing plate 23. Symmetrically arranged guiding grooves and inclined grooves 1605 are formed on the outer wall of the first rotating rod 16. A guiding component is arranged in the buffer tube 9. Among them, the guiding component includes a support column 17 fixedly installed in the buffer tube 9. A piston disc 18 and a movable plate 20 that are slidably connected to the first rotating rod 16 are slidably installed on the support column 17. A first limiting block 1801 that is slidably fitted with the guiding groove is fixed on the inner wall of the piston disc 18. A second limiting block 2001 that is slidably fitted with the inclined groove 1605 is fixed on the inner wall of the movable plate 20. The guiding component further includes a first spring 21 and a second spring 22 sleeved on the first rotating rod 16. Two ends of the first spring 21 are respectively abutted against the movable plate 20 and the piston disc 18. Two ends of the second spring 22 are respectively abutted against the movable plate 20 and the inner wall of the buffer tube 9.

[0055] Specifically, the guiding groove can be divided into multiple segments, namely a first straight groove 1601, a first annular groove 1602, a second straight groove 1603, and a second annular groove 1604. Both ends of the second annular groove 1604 are respectively connected to the ends of the first straight groove 1601 and the second straight groove 1603. One end of the first annular groove 1602 is connected to the end of the first straight groove 1601, and the other end is connected to the second straight groove 1603. Before coating starts, the first spring 21 and the second spring 22 are in a compressed state, and the elastic potential energy of the second spring 22 is greater than that of the first spring 21, so that the movable plate 20 and the piston disc 18 are located at the end of the stroke towards the conveying pipe 13, and the movable plate 20 has a tendency to move towards the piston disc 18, so that the first limiting block 1801 is located at the connection position of the first straight groove 1601 and the second annular groove 1604, and the second limiting block 2001 is located at the end of the stroke of the inclined groove 1605 towards the first annular groove 1602 side. At this time, the sealing plate 23 seals the conveying groove 901;

[0056] When the conveying pipe 13 conveys the coating liquid in the storage tank 8 into the buffer pipe 9, as the amount of the coating liquid increases, the pressure in the buffer pipe 9 gradually increases. Under the action of the pressure driving force, the two piston disks 18 are pushed to move away from each other. The piston disk 18 will move along the length direction of the support column 17 and compress the first spring 21. The piston disk 18 will also drive the first limit block 1801 to slide along the track of the first straight groove 1601. The first limit block 1801 and the first straight groove 1601 provide a locking force for the first rotating rod 16 to ensure that the first rotating rod 16 will not rotate. As the first spring 21 is continuously compressed, the elastic potential energy of the first spring 21 will tend towards the elastic potential energy of the second spring 22, making the movable plate 20 tend to move away from the piston disk 18. However, since the first rotating rod 16 is in a fixed state and the inclined groove 1605 is spirally arranged, under the action of the inclined groove 1605 and the second limit block 2001, the movable plate 20 also remains fixed until the first limit block 1801 moves to the connection position of the first straight groove 1601 and the first annular groove 1602. The first rotating rod 16 is no longer locked, and the elastic potential energy of the first spring 21 is released, driving the movable plate 20 to move away from the piston disk 18. Under the action of the second limit block 2001 and the inclined groove 1605, the first rotating rod 16 is controlled to rotate to drive the plugging plate 23 to move. When the second limit block 2001 moves to the end of the stroke on the other side of the inclined groove 1605, the rotation angle of the first rotating rod 16 reaches the maximum, and the plugging plate 23 is separated from the conveying groove 901, making the conveying groove 901 in a conducting state. Thus, the coating liquid is conveyed into the coating assembly through the conveying groove 901. At the same time, when the first rotating rod 16 rotates, it will also control the movement of the first annular groove 1602, making the first limit block 1801 move to the connection position of the first annular groove 1602 and the second straight groove 1603. During this process, the elastic potential energy of the first spring 21 is still greater than the elastic potential energy of the second spring 22. A sliding sleeve 19 sleeved on the first rotating rod 16 is fixed on the piston disk 18. Under the action of the sliding sleeve 19, it can prevent the coating liquid from entering the side of the piston disk 18 facing the movable plate 20 through the guiding groove, thus avoiding the waste of the coating liquid.

[0057] Preferably, when the pressure in the buffer pipe 9 changes, the piston disk 18 will generate a corresponding displacement. At this time, through the close fit between the first limit block 1801 and the guiding groove, the first rotating rod 16 can be locked first, ensuring that the conveying groove 901 is always in a plugged state before the pressure in the buffer pipe 9 reaches the preset value, effectively preventing the coating liquid from flowing out prematurely under unstable pressure and avoiding adverse effects on the coating quality of the organic layer.

[0058] When the pressure in the buffer tube 9 reaches the set value smoothly, the first limit block 1801 and the guide groove will work together to unlock the first rotating rod 16. Subsequently, under the precise cooperation of the second limit block 2001 and the inclined groove 1605, the first rotating rod 16 starts to operate, and makes way through the blocking plate 23 connected to it, so that the conveying groove 901 is connected, thereby ensuring that the coating liquid in the buffer tube 9 can be stably discharged through the conveying groove 901 within the set pressure range, achieving precise coating, preventing adverse effects such as horizontal and vertical lines caused by pressure fluctuations during coating, and ensuring the uniformity and stability of the coating quality of the organic layer.

[0059] In addition, if the coating liquid delivery rate into the buffer tube 9 exceeds its discharge rate, the piston disk 18 will continue to displace, prompting the first limit block 1801 to slide along the second straight groove 1603, thereby playing a buffering role and effectively reducing the pressure fluctuations generated by the coating liquid during the discharge process, further ensuring the smooth progress of the coating process and avoiding coating defects caused by pressure fluctuations.

[0060] See also Figures 2 - 6 , Figure 10 , Figure 12 The follow-up adjustment mechanism includes a second rotating rod 26 rotatably mounted on the end of the buffer tube 9, a guide groove is provided on the circumferential outer wall of the second rotating rod 26, a movable rod 24 penetrating the buffer tube 9 is fixed on the piston plate 18, a second limiting column 25 slidably engaged with the guide groove is fixed on the end of the movable rod 24, and a driven component is provided on the buffer tube 9, wherein the driven component includes a first bevel gear 27 fixed on the second rotating rod 26, a third rotating rod 28 is rotatably mounted on the buffer tube 9, and a second bevel gear 27 meshing with the first bevel gear 27 is fixed on the third rotating rod 28. 9. The driven component also includes a rotating sleeve 15 rotatably mounted on the conveying pipe 13, the rotating sleeve 15 is sleeved with a belt 30 connected to the third rotating rod 28, the outer wall of the rotating sleeve 15 is provided with a first spiral groove 1501, the conveying component includes a partition 1301 fixed on the conveying pipe 13, the outer wall of the conveying pipe 13 is provided with through grooves 1302 symmetrically arranged in the upper and lower directions, the conveying pipe 13 is slidably mounted with a hollow tube 14 that is conductively matched with the through groove 1302, and the hollow tube 14 is fixed with a first limiting column 1401 that is slidably connected to the first spiral groove 1501.

[0061] It should be noted that the sizes of the hollow tubes 14 are different. The size of the hollow tube 14 in the middle section is larger than that of the delivery tube 13. The inner diameters of the hollow tubes 14 at both ends are comparable to the outer diameter of the delivery tube 13. The through grooves 1302 are distributed on both the upper and lower sides of the partition plate 1301. The guiding groove can be divided into two sections, namely the horizontal groove 2601 and the second spiral groove 2602, and the ends of the horizontal groove 2601 and the second spiral groove 2602 are connected to each other. Before the coating starts, the distance between the two piston discs 18 is the smallest, so that the length of the movable rod 24 extending out of the buffer tube 9 is the smallest, so that the second limiting post 25 is located at the end of the stroke of the horizontal groove 2601 away from the second spiral groove 2602. At this time, the first limiting post 1401 is located on the side of the first spiral groove 1501 away from the buffer tube 9, and the hollow tube 14 is also located on the side away from the buffer tube 9, and the middle part of the hollow tube 14 is completely connected to the two through grooves 1302. At this time, the delivery rate of the delivery tube 13 increases.

[0062] Furthermore, when the coating liquid in the storage tank 8 is pumped to the delivery tube 13, under the action of the partition plate 1301, the coating liquid above the partition plate 1301 enters the hollow tube 14 through one of the through grooves 1302 and enters the delivery tube 13 below the partition plate 1301 through the other through groove 1302, and then is delivered to the buffer tube 9. As the pressure in the buffer tube 9 gradually increases, it drives the piston disc 18 to move, thereby controlling the movement of the movable rod 24 to drive the second limiting post 25 to slide along the track of the horizontal groove 2601. Under the action of the second limiting post 25 and the horizontal groove 2601, the second rotating rod 26 is in a fixed state. When the second limiting post 25 disengages from the horizontal groove 2601 and enters the second spiral groove 2602, it indicates that the pressure in the buffer tube 9 is about to reach the set value. Under the action of the second limiting post 25 and the second spiral groove 2602, the second rotating rod 26 rotates a certain angle, thereby controlling the third rotating rod 28 to rotate through the first bevel gear 27 and the second bevel gear 29. The third rotating rod 28 will drive the rotating sleeve 15 to rotate through the belt 30, so as to drive the hollow tube 14 to move towards the buffer tube 9 through the first spiral groove 1501 and the first limiting post 1401. The part with a smaller inner diameter of the hollow tube 14 will move to the position where it cooperates with one of the through grooves 1302 above the partition plate 1301, so that the conduction area between this through groove 1302 and the hollow tube 14 is reduced, thereby reducing the release of the coating liquid. When the pressure in the buffer tube 9 reaches the set value, the hollow tube 14 also moves to the preset position, so that the delivery rate of the delivery tube 13 is equivalent to the discharge rate of the delivery groove 901.

[0063] Preferably, through the ingenious cooperation between the second limit post 25 and the second spiral groove 2602, when the pressure in the buffer tube 9 approaches the set value, the conduction amount of the through groove 1302 can be synchronously and accurately reduced, thereby effectively reducing the conveying rate of the conveying tube 13, and precisely controlling the pressure change in the buffer tube 9. As this process progresses, until the pressure in the buffer tube 9 stably reaches the set value, at this time, the conveying rate of the conveying tube 13 is also adjusted to a preset reasonable value and matches the discharge rate of the conveying groove 901, reducing the possible pressure fluctuations during the coating process from the source, providing a strong guarantee for the improvement of the organic layer coating quality, and ensuring that the quality reaches the best state when the display screen organic layer is coated.

[0064] When the pumping of the coating liquid fluctuates and causes an abnormal increase in the pumping volume, the buffer tube 9 can play its buffering role, effectively limiting the rising amplitude of the pressure in the buffer tube 9 and avoiding serious impacts on the coating process due to a sharp rise in pressure. At the same time, under the combined action of the second limit post 25 and the second spiral groove 2602 again, the conduction amount of the through groove 1302 will be further reduced. By reducing the conveying rate of the conveying tube 13, the pressure in the buffer tube 9 is actively reduced until the pressure in the buffer tube 9 drops back to the set range, and the conveying rate of the conveying tube 13 also returns to the set value. The whole process does not require frequent manual intervention, realizing automatic and intelligent precise regulation.

[0065] Please refer to Figures 2 - 4 、 Figure 11 As shown in, the coating assembly includes a slit coating head 10 fixedly installed on the buffer tube 9. An inlet groove 1001 that is in conduction cooperation with the conveying groove 901 is formed in the slit coating head 10. Symmetrically arranged sealing plates 11 are slidably installed in the slit coating head 10. A clamping groove 1101 is formed on the sealing plate 11, and a slit plate 12 that is slidably fitted with the clamping groove 1101 is fixed on the sealing plate 11.

[0066] Furthermore, the two sealing plates 11 are symmetrically arranged, and the slit plates 12 respectively fixed on the two sealing plates 11 are staggered and can be correspondingly inserted into the card slots 1101 opened on the two sealing plates 11. The gap formed between the two slit plates 12 is the coating discharge slit. When the conveying groove 901 is connected, the coating liquid in the buffer tube 9 will enter the slit coating head 10 through the conveying groove 901 and the feeding groove 1001, and be transported to the surface of the display screen through the gap between the two slit plates 12 to coat the display screen with an organic layer. If the size of the display screen deviates from the size of the coating discharge slit formed by the two slit plates 12, the size of the coating discharge slit can be adjusted by adjusting the spacing between the two sealing plates 11 to adapt to the organic layer coating of different display screens. The adjustment of the position of the sealing plate 11 can be achieved by a cylinder. This is an application of the prior art and is not elaborated in this application.

[0067] An OLED display screen packaging method comprises the following steps:

[0068] Step 1: Place the display screen to be packaged on the carrier 2;

[0069] Step 2: The coating liquid in the storage box 8 is transported to the buffer tube 9 through the delivery pipe 13 and the delivery assembly, and the pressure control mechanism is controlled to move under the action of the pressure;

[0070] Step 3: When the pressure in the buffer tube 9 reaches a certain level, the pressure-boosting control mechanism controls the delivery slot 901 to be in a conducting state through the blocking plate 23, and delivers the coating liquid to the coating assembly to coat the display screen;

[0071] Step 4: The boost control mechanism will also drive the follow-up control mechanism to move, so as to adjust the conductance of the delivery pipe 13 through the delivery component.

[0072] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0073] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only one independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An OLED display screen packaging device, comprising: A packaging body, and a carrying platform fixed in the packaging body, wherein a translation assembly is arranged in the packaging body, and the translation assembly comprises a connecting plate, and a material storage box is fixed on the upper side of the connecting plate; It is characterized by further comprising: A buffer tube is fixed to the lower side of the connecting plate, the buffer tube is connected to a conveying pipe connected to the material storage box, a conveying groove is formed on the outer wall of the buffer tube, and a coating assembly is arranged on the buffer tube; A conveying assembly, arranged on the conveying pipe, for conveying the solution in the storage box to the buffer pipe; A boost regulating mechanism is arranged in the buffer tube, a sealing plate is connected to the boost regulating mechanism, and a follow-up regulating mechanism connected to the boost regulating mechanism is arranged on the buffer tube. The boost regulating mechanism can adjust the conduction state of the conveying groove through the sealing plate, and the boost regulating mechanism can also adjust the conduction amount of the conveying pipe through the follow-up regulating mechanism and the conveying assembly.

2. The OLED display packaging device according to claim 1, characterized in that: The boost control mechanism includes a first rotating rod rotatably installed in the buffer tube, the first rotating rod is fixedly connected to the blocking plate, the outer wall of the first rotating rod is provided with symmetrically arranged guide grooves and inclined grooves, and a guide assembly is arranged in the buffer tube.

3. The OLED display packaging device according to claim 2, characterized in that: The guide assembly includes a support column fixedly installed in the buffer tube, a piston disk and a movable plate slidably installed on the support column and slidably connected to the first rotating rod, a first limit block slidably engaged with the guide groove is fixed to the inner wall of the piston disk, and a second limit block slidably engaged with the inclined groove is fixed to the inner wall of the movable plate.

4. The OLED display packaging device according to claim 3, characterized in that: The guide assembly also includes a first spring and a second spring sleeved on the first rotating rod, the two ends of the first spring respectively abut against the movable plate and the piston disc, and the two ends of the second spring respectively abut against the movable plate and the inner wall of the buffer tube.

5. The OLED display screen packaging device according to claim 3, characterized in that: The follow-up adjustment mechanism includes a second rotating rod rotatably mounted at the end of the buffer tube, a guide groove is provided on the circumferential outer wall of the second rotating rod, a movable rod penetrating the buffer tube is fixed on the piston disk, a second limiting column slidably engaged with the guide groove is fixed on the end of the movable rod, and a follower assembly is provided on the buffer tube.

6. The OLED display screen packaging device according to claim 5, characterized in that: The driven assembly includes a first bevel gear fixed on the second rotating rod, a third rotating rod is rotatably mounted on the buffer tube, and a second bevel gear meshing with the first bevel gear is fixed on the third rotating rod.

7. The OLED display screen packaging device according to claim 6, characterized in that: The driven assembly also includes a rotating sleeve rotatably mounted on the conveying pipe, a belt connected to the third rotating rod is sleeved on the rotating sleeve, and a first spiral groove is formed on the outer wall of the rotating sleeve.

8. The OLED display screen packaging device according to claim 7, characterized in that: The conveying assembly includes a partition fixed on the conveying pipe, the outer wall of the conveying pipe is provided with through grooves symmetrically arranged in the upper and lower directions, a hollow tube that is slidably mounted on the conveying pipe and is in communication with the through groove is conductively mounted, and a first limiting column that is slidably connected to the first spiral groove is fixed on the hollow tube.

9. The OLED display screen packaging device according to claim 1, characterized in that: The coating assembly includes a slit coating head fixedly mounted on the buffer tube, a feeding trough formed in the slit coating head and coordinated with the conveying trough, a sealing plate symmetrically arranged is slidably mounted in the slit coating head, a card slot is formed on the sealing plate, and a slit plate slidably engaged with the card slot is fixed on the sealing plate.

10. An OLED display screen packaging method, using the OLED display screen packaging device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: Place the display screen to be packaged on the carrier; Step 2: The coating liquid in the storage box is transported to the buffer tube through the delivery pipe and the delivery assembly, and the pressure control mechanism is controlled to move under the action of pressure; Step 3: When the pressure in the buffer tube reaches a certain level, the pressure-boosting control mechanism controls the conveying slot to be in a conducting state through the blocking plate, and conveys the coating liquid to the coating assembly to coat the display screen; Step 4: The boost control mechanism will also drive the follow-up control mechanism to move, so as to adjust the conductance of the delivery pipe through the delivery component.

Images