Backlight reflective layer printing apparatus and applications thereof

Abstract

This application belongs to the field of semiconductor processing technology, specifically relating to a backlight reflective layer printing device and its application. This application effectively controls the vibration generated during the printing process by optimizing the mechanical structure and position design of the frame, support plate device, and multi-axis spindle, reducing the deviation between the actual operating path and the planned path of the piezoelectric jet valve. This significantly improves the stability of the piezoelectric jet valve operation and the printing accuracy. Furthermore, this application, by setting up a micro-adjustment device, a positioning system, an inkjet calibration system, and a needle alignment device, and utilizing their coordinated relationship, can precisely correct printing parameters such as the jetting position or jetting volume of the piezoelectric jet valve. Therefore, based on the aforementioned stable printer body structure, the coating quality of the backlight reflective layer obtained by piezoelectric jet printing will be further improved. Thus, the backlight reflective layer prepared using this invention has better thickness uniformity and a better reflective effect.

Description

Technical Field

[0001] This application belongs to the field of semiconductor processing technology, specifically relating to a backlight reflective layer printing device and its application. Background Technology

[0002] In recent years, Mini-LED backlighting has attracted widespread attention due to its outstanding performance, becoming a new favorite in the display industry and widely used in high-end TVs, monitors, and laptops. Compared to traditional LED backlighting, Mini-LED uses smaller light-emitting diodes (typically between 100 and 200 micrometers) to form dimming zones. By independently controlling the brightness of each LED, the backlight panel exhibits more refined local dimming and a higher dynamic range display effect. Therefore, display products using Mini-LED backlighting have higher color accuracy and reproduction capabilities, resulting in more vivid and lifelike images with a stronger sense of detail and realism.

[0003] To maximize light output from LEDs onto the display panel, thereby improving light utilization and display quality, a backlight reflective layer needs to be coated on top of the backlight circuitry. Initially, screen printing was primarily used for this purpose. However, the height of a single screen print often falls short of the high reflectivity requirements of the backlight reflective layer, necessitating multiple prints to achieve the desired layer height. Furthermore, ink overflow can lead to poor aperture precision and morphology around the LEDs when the print thickness is excessive. Therefore, screen printing cannot achieve precise coating around the LED edges. This means that the backlight reflective layer at the LED edges often maintains a certain distance from the LEDs themselves, resulting in LED shadows and ultimately uneven brightness on the display panel surface, leading to poor image quality.

[0004] Against this backdrop, to minimize the distance between the edge of the backlight reflective layer and the light-emitting diodes (LEDs) and to avoid the impact of light and shadow on the display effect as much as possible, patent CN 114683729 B discloses a more refined printing technology—piezoelectric jet printing. Compared to the traditional stencil printing method of screen printing, piezoelectric jet printing requires piezoelectric jet valves to avoid LEDs and other electronic components and sequentially spray the backlight panel. Therefore, the position of the piezoelectric jet valves and the accuracy of their movement path during the spraying process become paramount in the preparation of the backlight reflective layer. To this end, this patent addresses the calibration of the piezoelectric jet valves from multiple angles. Specifically: by setting the first camera in the first acquisition unit, it can cooperate with the second control unit to adjust the spacing between multiple piezoelectric jet valves; by setting the second camera in the identification unit, the distance between the backlight panel and the piezoelectric jet valves is calibrated; the patent also includes a second acquisition unit to ensure the uniformity of inkjet quality for each piezoelectric jet valve within the same time interval. In addition, the patent also uses piezoelectric jet valves of two different diameters to perform large-area spraying and fine processing on the backlight panel, which improves the spraying efficiency and also increases the fineness of the edge processing of the backlight reflective layer around the light-emitting diode. Therefore, the overall printing accuracy of the backlight reflective panel is higher and the display effect of the display panel is better.

[0005] Before printing the backlight reflective layer using piezoelectric jet printing, it is often necessary to analyze the distribution of the LED backlight panel and light-emitting diodes using software, and plan the printing path of the piezoelectric jet valve accordingly. The printing process disclosed in the aforementioned patent is based on an ideal mechanical equipment environment—that is, the planned path of the piezoelectric jet valve is consistent with the actual printing path. However, in the actual piezoelectric jet printing process, the actual operating path of the piezoelectric jet valve often deviates from the planned path due to various reasons. This deviation directly affects the printing accuracy of the backlight reflective layer, and thus the display effect. Therefore, to reduce the above deviation and improve the printing accuracy of the piezoelectric jet printing backlight panel, the inventive concept of using piezoelectric jet printing to print the backlight reflective layer needs further implementation in terms of mechanical structure. Summary of the Invention

[0006] This application provides a backlight reflective layer printing device with high printing stability and high precision, which is achieved through the following technical solution:

[0007] A backlight reflective layer printing apparatus, comprising:

[0008] The frame includes an installation platform and a plurality of support bases for supporting the installation platform; the upper end of the support base is provided with a vibration isolation device that is in contact with the lower surface of the installation platform; the lower end of the support base is enclosed to form a stable platform; the stable platform includes an enclosure frame disposed between two adjacent support bases, and a positioning plate covering the upper end of the enclosure frame and used to limit the position of the support bases.

[0009] An adsorption platform, comprising a substrate for fixing a backlight panel; an R-axis frame fixedly mounted on the mounting platform and used for correcting the printing position of the backlight panel is disposed below the substrate.

[0010] A multi-axis shaft bracket, comprising two Y-axis slide rails parallel to each other on the upper surface of the mounting platform, and an R-axis bracket disposed between the two Y-axis slide rails;

[0011] A printing module, disposed on the multi-axis support, includes a piezoelectric jet valve for coating printing.

[0012] As mentioned above, during the backlight reflective layer coating process, the piezoelectric jet valve needs to move and spray according to the planned printing path to avoid numerous small electronic components such as light-emitting diodes (LEDs). Furthermore, it needs to coat the edges of the LEDs as much as possible without affecting their normal operation. Therefore, the fabrication of the backlight reflective layer is a printing process with extremely high precision requirements. However, as a high-speed moving printing device, the vibration generated by the movement of the piezoelectric jet valve between LEDs directly affects the printing trajectory, highlighting the inherent limitations of piezoelectric jet printing. Therefore, overcoming the precision technical barriers of piezoelectric jet printing and providing a piezoelectric jet printing device for backlight reflective layers with high printing precision and stability has become a primary technical problem to be solved.

[0013] In this technical solution, the vibration generated during the printing process is effectively controlled through the mechanical structure and position design of the frame, adsorption platform, and multi-axis support. This reduces the deviation between the actual operating path and the planned path of the piezoelectric jet valve, significantly improving the stability of the piezoelectric jet valve operation and the printing accuracy. Specifically:

[0014] The frame, as the structural foundation of high-precision printing equipment, houses most of the printing components, and its structural design is crucial for improving print quality. In this technical solution, a vibration isolation device absorbs vibrations generated by the mounting platform during the movement of the piezoelectric jet valve and the rotation of the R-axis frame, preventing these vibrations from being transmitted to the support base and affecting the stability of the mounting platform. Furthermore, by installing a stable platform at the lower end of the support base that works in conjunction with the vibration isolation device, the mounting platform is stably supported while isolating frame vibrations caused by environmental vibrations, thus preventing resonance between the piezoelectric jet valve, which is indirectly mounted on the mounting platform, and the frame body, which could affect printing quality.

[0015] The stability and reliability of the substrate, which serves as the fixed plane for the backlight panel, directly affect the injection accuracy of the piezoelectric jet valve. In this technical solution, by fixing the R-axis bracket, which adjusts the angle of the substrate, between the aforementioned highly stable frame and the substrate, the vibration caused by substrate rotation can be quickly absorbed. Printing under these conditions results in higher accuracy. Furthermore, this technical solution, through the design of the multi-axis bracket on the upper surface of the mounting platform and the mounting position of the adsorption platform, avoids mutual interference between the vibration generated by the R-axis bracket rotation and the vibration generated by the multi-axis bracket also mounted on the mounting platform. Therefore, the overall operational stability of the printing equipment is extremely high, and the printing accuracy of the backlight reflective layer is even better.

[0016] Preferably, the adsorption platform further includes a transport assembly for picking up and placing the backlight panel. The transport assembly includes a lifting rod for supporting the backlight panel. The bottom end of the lifting rod is connected to a lifting plate that is penetrated by the R-axis frame. A drive motor is provided at the lower end of the lifting plate. The surface of the drive motor is provided with a guide post that penetrates the lifting plate and is fixedly connected to the lower surface of the substrate. A drive block is provided on the guide post that is connected to the lower surface of the lifting plate to drive the lifting plate to move up and down. The substrate is provided with a through hole for the upper end of the lifting rod to pass through.

[0017] In this technical solution, by setting a conveying component in the adsorption platform, the backlight panel can be picked up and placed. On the one hand, this avoids, to a certain extent, the vibration of the installation platform caused by directly picking up and placing the backlight panel using a substrate lifting mechanism; on the other hand, it increases the convenience and intelligence of loading.

[0018] Preferably, the frame further includes a load-distributing component disposed at the bottom end of the support base and used to distribute the weight of the frame; the load-distributing component includes a load plate disposed at the bottom end of the support base and heavy-duty feet evenly distributed on the lower surface of the load plate.

[0019] In this technical solution, by setting a load-distributing component at the bottom of the support base, the weight load of the main structure of the printing equipment can be distributed throughout the load plate, thereby alleviating the supporting pressure on the support base and avoiding stress concentration. Therefore, the overall stability of the frame is higher, and its service life is longer. Furthermore, the design of evenly distributing heavy-duty feet on the lower surface of the load plate can also level the load plate, ensuring the horizontality of the installation platform.

[0020] Preferably, the adsorption platform further includes an adsorption assembly for fixing the backlight panel; the adsorption assembly includes adsorption holes disposed on the substrate and a solenoid valve for controlling the opening and closing of the adsorption holes.

[0021] In backlight reflective layer printing equipment, there are various methods for fixing the backlight panel. In this technical solution, by setting up an adsorption component and using a solenoid valve to control the adsorption holes to fix the backlight panel, the impact of contact fixing on the performance of the backlight panel can be minimized while ensuring reliable fixing. Therefore, the quality of the product prepared after coating is more guaranteed.

[0022] Preferably, the adsorption platform further includes a patch gravity sensor disposed on the upper surface of the substrate and used to measure the weight of the backlight panel.

[0023] Piezoelectric jet printing of the backlight reflective layer is an additive printing technology. Therefore, the quality of the additive manufacturing process not only affects the quality of the printed product but also the performance differences between batches of printed products. To address this, this technical solution utilizes a surface-mount gravity sensor on the substrate to detect the quality of the backlight product during both the material handling and unloading stages. By detecting the material during handling, backlight panels to be printed can be screened based on quality, preventing the printing of substandard panels. Similarly, by detecting the material during unloading, and using the quality differences between handling and unloading, substandard printed products can be screened out. Thus, the overall quality uniformity of the printed backlight products is controlled.

[0024] Preferably, the multi-axis frame further includes a gantry frame, the bottom ends of the two columns of the gantry frame are slidably connected to the two Y-axis slide rails respectively; along the Y-axis direction, one or both sides of the crossbeam of the gantry frame are also provided with an X-axis slide rail; perpendicular to the X-axis slide rail, the multi-axis frame is also provided with a Z-axis slide rail; the printing module is mounted on the Z-axis slide rail.

[0025] In this technical solution, by setting two columns at their bottom ends to slide and connect with the two Y-axis slide rails respectively, and by setting an X-axis slide rail on one or both sides of the gantry beam, the gravity load of the printing module can be distributed more evenly compared with the design of a single support point in a cantilever slide rail, thus making the printing equipment more stable in operation.

[0026] As a further preferred embodiment, the printing module includes a mounting bracket slidably mounted on the Z-axis slide rail, the mounting bracket being provided with a micro-adjustment device for adjusting the position of the piezoelectric jet valve; the micro-adjustment device includes a micro-slide rail arranged parallel to the X-axis slide rail and slidably connected to multiple piezoelectric jet valves, and a high-resolution grating for positioning the piezoelectric jet valves.

[0027] To meet varying display brightness requirements, the size and layout of LEDs on different backlight panels often differ. Therefore, while ensuring coating efficiency using multiple sets of piezoelectric jet valves, increasing the application flexibility of these valves is a key technical challenge addressed in this solution. Specifically, this solution utilizes a micro-tracking rail on the mounting bracket, along with a matching high-resolution grating. This allows for flexible and precise adjustment of the piezoelectric jet valve's position, broadening its applicability and improving accuracy when coating backlight reflective layers on different backlight panel models.

[0028] As a further preferred embodiment, along the X-axis direction, the printing module further includes a positioning system disposed at both ends of the fixing frame and used to check the position of the printing module relative to the backlight panel; the positioning system includes a first vision module for coarse positioning of the backlight panel, a second vision module for fine positioning of the backlight panel, and a height detection module for checking the printing height of the printing module relative to the backlight panel.

[0029] In piezoelectric jet printing, the positional distribution of the printing module relative to the backlight panel directly affects the printing accuracy. Therefore, in this technical solution, a positioning system is installed on both sides of the printing module. The positional information fed back by this system, in conjunction with the X-axis, Y-axis, and Z-axis slide rails, allows for real-time control of the printing module's position relative to the backlight panel. This enables the printing module to move more precisely along the planned path, spraying the backlight panel and further improving the printing accuracy of the backlight reflective layer. Furthermore, the second vision module can perform automatic optical inspection of the printed backlight reflective layer, thus ensuring better detail processing and performance of the final product.

[0030] As a further preferred embodiment, the printing device also includes an approval system for calibrating the piezoelectric jet valves; the approval system includes a weighing module for measuring the flow rate of the piezoelectric jet valves and a third vision module for observing the spacing between the piezoelectric jet valves.

[0031] To ensure coating efficiency, piezoelectric jet printing of the backlight reflective layer requires multiple piezoelectric jet valves to simultaneously spray the backlight panel. Therefore, the uniformity of ink coating quality across all piezoelectric jet valves within the same timeframe significantly impacts the thickness of the backlight reflective layer. To address this, this technical solution incorporates a weighing module to verify the coating quality of each piezoelectric jet valve before printing. When significant discrepancies exist in the flow rates between the valves, adjustments can be made to ensure the overall coating effect of the backlight reflective layer. Furthermore, the distance between adjacent piezoelectric jet valves affects the ink coating thickness at their boundary. To address this, a third-vision module, in conjunction with a macro-adjustment device, verifies and calibrates the positional relationship between the piezoelectric jet valves, resulting in a more uniform overall thickness and more balanced reflection effect in the sprayed backlight reflective layer.

[0032] As a further preferred embodiment, the printing module further includes a Z-axis adjustment device for adjusting the height of the piezoelectric jet valves along the Z-axis; the printing equipment further includes a needle alignment device for verifying the height of multiple piezoelectric jet valves along the Z-axis.

[0033] As a further preferred embodiment, the needle alignment device includes a digital display micrometer head slide fixed to the upper surface of the positioning plate, an alignment platform fixedly mounted on the digital display micrometer head slide, and a tool setter provided on the upper surface of the alignment platform.

[0034] The distance between the piezoelectric jet valve and the backlight panel affects the inkjet range. When piezoelectric jet valves are unevenly distributed along the Z-axis with the same nozzle diameter, excessive overlapping coating areas are inevitable. To address this, this technical solution uses a alignment device to verify the height of multiple piezoelectric jet valves along the Z-axis. Based on the verification difference, the Z-axis adjustment device calibrates the height of the piezoelectric jet valves on the Z-axis, ensuring that piezoelectric jet valves with the same nozzle diameter are on the same horizontal plane, resulting in a more uniform backlight reflective layer thickness after coating. Furthermore, when using nozzles of different diameters for simultaneous coating, the height of the smaller-diameter piezoelectric jet valves on the Z-axis can be reduced using the above method to facilitate precise positioning. Therefore, by setting a Z-axis adjustment device, which can be used in conjunction with the needle alignment device and high-resolution grating, the distribution of piezoelectric jet valves in the Z-axis direction can be adjusted to adapt to different application environments. As a result, the printing equipment has greater flexibility and the precision of coating processing will be further improved.

[0035] Preferably, the printing device further includes a cooling diversion device for adjusting the ink temperature in the piezoelectric jet valve; the cooling diversion device includes a valve body air inlet connector connected to the piezoelectric jet valve, and an outlet throttle valve for controlling the flow of gas out of the piezoelectric jet valve; the cooling diversion device is also provided with an air inlet pipe for filling the piezoelectric jet valve with cooling gas through the air inlet connector, and an outlet pipe connected to the outlet throttle valve.

[0036] Piezoelectric inkjet printing is a process that converts electrical energy into mechanical energy. Specifically, the piezoelectric ceramic inside the piezoelectric jet valve deforms when subjected to voltage, driving the movement of the ejector pin and causing ink to flow out. Therefore, during high-speed printing, the temperature of the piezoelectric jet valve rises sharply, and the temperature of the ink stored inside the valve rises accordingly. However, on the one hand, when the ink temperature is too high, it tends to adhere to the nozzle walls, resulting in uneven ink droplet flow and ultimately affecting print quality. On the other hand, when the ink temperature is too high, its fluidity is strong, causing the ink coated on the backlight panel to easily flow towards the LEDs, which will affect the print quality of the backlight reflective layer. To avoid the aforementioned phenomenon, this technical solution involves installing an air inlet pipe for introducing cooling gas in the cooling distribution device, and installing several valve body air inlet connectors adapted to the piezoelectric jet valves on the air inlet pipe to distribute the cooling gas. This allows the cooling gas to flow into multiple sets of piezoelectric jet valves to cool the ink. Furthermore, the outlet throttle valve controls the circulation time of the gas inside the piezoelectric jet valve. Therefore, by adjusting the outlet throttle valves of several piezoelectric jet valves, the temperature difference between the inks inside different piezoelectric jet valves can be further reduced while lowering the ink temperature, resulting in a better morphology of the backlight reflective layer coating.

[0037] As a further preferred embodiment, the intake pipe is connected to an inflow solenoid valve for controlling the gas flow rate; the outlet pipe is connected to a detection device for detecting the outflow gas flow rate.

[0038] The application of any of the above-mentioned printing devices in the preparation of Mini-LED backlight reflective layers.

[0039] A display screen includes a backlight reflective layer, which is prepared using the printing equipment described in any of the preceding claims.

[0040] Compared with the prior art, this application has the following beneficial effects:

[0041] This application effectively controls vibrations generated during the printing process by optimizing the mechanical structure and positioning of the frame, adsorption platform, and multi-axis support. This reduces the deviation between the actual and planned operating paths of the piezoelectric jet valve, significantly improving both the stability of the piezoelectric jet valve operation and printing accuracy. Specifically, firstly, by incorporating vibration isolation devices, vibrations generated on the mounting platform during the movement of the piezoelectric jet valve and the rotation of the R-axis support are absorbed, preventing these vibrations from being transmitted to the support base and affecting the stability of the mounting platform. Furthermore, by installing a stable platform at the lower end of the support base that works in conjunction with the vibration isolation devices, the mounting platform is stably supported while isolating frame vibrations caused by environmental vibrations, preventing resonance between the piezoelectric jet valve, which is indirectly mounted on the mounting platform, and the frame body, thus avoiding impacts on printing quality. Secondly, by fixing the R-axis support, which adjusts the angle of the substrate, between the highly stable frame and the substrate, substrate vibrations caused by substrate rotation are quickly absorbed, resulting in higher printing accuracy. Furthermore, by setting two column bases that are slidably connected to the two Y-axis slide rails, forming a gantry-type multi-axis frame, and also providing X-axis slide rails on one or both sides of the gantry beam, the gravity load of the printing module can be distributed more evenly compared to the single support point design in cantilever slide rails, thus resulting in higher stability of the printing equipment. In addition, this application also provides a backlight panel picking and placing function by setting a transport component in the adsorption platform. On the one hand, this avoids, to some extent, the vibration of the installation platform caused by directly picking and placing the backlight panel using substrate lifting; on the other hand, it increases the convenience and intelligence of loading.

[0042] This application also utilizes a micro-adjustment device, a positioning system, an approval system, and a needle alignment device, along with their coordinated relationship, to precisely correct printing parameters such as the ejection position or ejection volume of the piezoelectric jet valves. Therefore, based on the aforementioned stable printing equipment structure, the coating quality of the backlight reflective layer obtained through piezoelectric jet printing will be further improved. Specifically, firstly, by setting a micro-track and a corresponding high-resolution grating and third-vision module, the spacing between the piezoelectric jet valves can be flexibly and precisely adjusted. This improves the flexibility of the printing equipment and allows for more precise control of the ink thickness at the jetting interface of the piezoelectric jet valves, resulting in better uniformity of the overall backlight reflective layer coating. Secondly, by setting a positioning system and a corresponding multi-axis support, the printing position of the printing module relative to the backlight panel can be adjusted in real time. Therefore, the printing module can move more precisely along the planned path to spray the backlight panel, further improving the printing accuracy of the backlight reflective layer. Third, by setting up a weighing module, the ink coating quality of each piezoelectric jet valve can be kept uniform within the same time frame. Therefore, the backlight reflective layer thickness of each piezoelectric jet valve is more uniform, and the reflection effect is more balanced. Fourth, by setting up a needle alignment device, in conjunction with a Z-axis adjustment device and a high-resolution grating, the height of the piezoelectric jet valve on the Z-axis can be calibrated. While ensuring the uniformity of the backlight reflective layer coating, the overlap of the jetting range of the piezoelectric jet valve can be reduced, resulting in a better quality backlight reflective layer after coating. In addition, this application also uses a cooling diversion device to further reduce the temperature difference of the ink inside different piezoelectric jet valves while lowering the ink temperature, resulting in a better morphology of the backlight reflective layer coating. Attached Figure Description

[0043] To clearly illustrate the embodiments, the drawings in the accompanying drawings will be briefly described below:

[0044] Figure 1 This is a schematic diagram of the structure of the outer casing of the printing device according to Embodiment 2 of the present invention;

[0045] Figure 2 This is a schematic diagram of the frame structure of Embodiment 2 of the present invention;

[0046] Figure 3 This is a schematic diagram of the adsorption platform in Embodiment 2 of the present invention;

[0047] Figure 4 This is a partial structural schematic diagram of the printing device according to Embodiment 2 of the present invention;

[0048] Figure 5 This is a partial structural schematic diagram of the printing device according to Embodiment 2 of the present invention;

[0049] Figure 6This is a partial structural schematic diagram of the printing device according to Embodiment 2 of the present invention;

[0050] Figure 7 This is a schematic diagram of the positioning system according to Embodiment 2 of the present invention;

[0051] Figure 8 This is a partial structural schematic diagram of the approval system according to Embodiment 2 of the present invention;

[0052] Figure 9 This is a partial structural schematic diagram of the printing device according to Embodiment 2 of the present invention;

[0053] Figure 10 This is a schematic diagram of the cooling flow distribution device according to Embodiment 1 of the present invention;

[0054] Reference numerals: 1. Frame; 11. Mounting platform; 12. Support base; 13. Vibration isolation device; 14. Stabilizing platform; 141. Enclosure frame; 142. Positioning plate; 15. Load distribution assembly; 151. Load plate; 152. Heavy-duty feet; 2. Adsorption platform; 21. Base plate; 22. R-axis frame; 23. Transport assembly; 231. Lifting rod; 232. Lifting plate; 233. Drive motor; 2331. Guide column; 2332. Drive block; 24. Adsorption assembly; 241. Adsorption hole; 242. Solenoid valve; 25. Patch gravity sensor; 3. Multi-axis frame; 31. Y-axis slide rail; 32. Gantry frame; 33. X-axis 34. Slide rail, Z-axis slide rail, 4. Printing module, 41. Piezoelectric jet valve, 42. Fixing frame, 43. Micro-adjustment device, 431. Micro-slide rail, 432. High-resolution grating, 44. Positioning system, 441. First vision module, 442. Second vision module, 443. Height detection module, 45. Z-axis adjustment device, 5. Verification system, 51. Weighing module, 52. Third vision module, 6. Needle alignment device, 61. Digital display micro-head slide table, 62. Alignment platform, 63. Tool setter, 7. Cooling diversion device, 71. Valve body air inlet connector, 72. Air outlet throttle valve, 73. Air inlet pipe, 74. Air outlet pipe. Detailed Implementation

[0055] The present application will be further described below with reference to specific embodiments. Those skilled in the art will be able to implement the present application based on these descriptions. Furthermore, the embodiments of the present application described below are generally only a part of the embodiments of the present application, and not all of the embodiments. Therefore, all other embodiments obtained by those skilled in the art based on the embodiments of the present application without inventive effort should fall within the scope of protection of the present application.

[0056] Example 1

[0057] This embodiment discloses a backlight reflective layer printing device, including:

[0058] The frame 1, as the structural foundation of the high-precision printing equipment, is crucial for improving the printing quality of the backlight reflective layer. In this embodiment, the frame 1 includes a mounting platform 11 for mounting the printing components and six support bases 12 evenly distributed on the lower surface of the mounting platform 11. To absorb the vibrations generated by the mounting platform 11 under the drive of the printing components and to prevent environmental vibrations from affecting the printing components mounted on the mounting platform 11, a vibration isolation device 13 is provided between the support bases 12 and the mounting platform 11. The vibration isolation device 13 is an air-floating vibration isolator. To further provide stable support for the mounting platform 11 and reduce the impact of environmental vibrations on the mounting platform 11, a stable platform 14 is formed by enclosing the lower end of the support bases 12. The stable platform 14 includes an enclosure frame 141 disposed between two adjacent support bases 12 and a positioning plate 142 covering the upper end of the enclosure frame 141 and used to define the position of the support bases 12. The arrangement of the enclosure frame 141 and the positioning plate 142 can further limit the positional relationship of the above-mentioned six support bases 12, thus making the installation platform 11 more stable.

[0059] Based on this, considering the load-bearing capacity of the frame 1, the frame 1 in this embodiment also includes a load-distribution component 15 for dispersing the weight of the frame 1. Specifically, the load-distribution component 15 includes a load plate 151 disposed at the bottom of the stable platform 14 and the support base 12, and heavy-duty feet 152 evenly distributed on the lower surface of the load plate 151. By setting the load-distribution component 15, the weight load of the main structure of the printing device can be distributed to the entire load plate 151, thereby alleviating the supporting pressure on the support base 12 and avoiding stress concentration. Therefore, the overall stability of the frame 1 is higher and its service life is longer. In addition, the design of evenly distributing the heavy-duty feet 152 on the lower surface of the load plate 151 can also level the load plate 151 and ensure the levelness of the mounting platform 11.

[0060] The adsorption platform 2 includes a substrate 21 for fixing the backlight panel. The stability and reliability of the substrate 21, which serves as the plane for fixing the backlight panel, directly affect the spraying accuracy of the piezoelectric jet valve 41. In this embodiment, an R-axis bracket 22 is fixedly mounted on the mounting platform 11 below the substrate 21 and corrects the printing position of the backlight panel. By fixing the R-axis bracket 22 between the high-stability frame 1 and the substrate 21, the vibration of the substrate 21 caused by its rotation can be quickly absorbed, resulting in higher printing accuracy.

[0061] To secure the backlight panel before printing and prevent displacement during the printing process, the adsorption platform 2 in this embodiment further includes an adsorption assembly 24 for securing the substrate 21. The adsorption assembly 24 includes adsorption holes 241 disposed on the substrate 21 and a solenoid valve 242 for controlling the opening and closing of the adsorption holes 241. By using the adsorption assembly 24 and the solenoid valve 242 to control the fixation of the backlight panel by the adsorption holes 241, the impact of contact fixation on the backlight panel performance can be minimized while ensuring reliable fixation. Therefore, the quality of the product prepared after coating is more guaranteed. Furthermore, to further optimize the adsorption efficiency of the adsorption assembly 24 on the substrate 21 and increase its flexibility of use, the adsorption holes 241 in this embodiment are evenly distributed outwards from the center point of the upper surface of the substrate 21 to form different adsorption zones, thereby adapting to the adsorption of backlight panels of different sizes.

[0062] Piezoelectric jet printing of the backlight reflective layer is an additive printing technology. Therefore, the quality of the additive manufacturing not only affects the quality of the printed product but also the performance differences between batches of printed products. To address this, in this embodiment, the adsorption platform 2 also includes a patch gravity sensor 25 disposed on the upper surface of the substrate 21 for measuring the weight of the backlight panel. By disposing of the patch gravity sensor 25 on the upper surface of the substrate 21, the quality of the backlight product can be detected during material handling and unloading. Detection during material handling allows for the screening of backlight panels to be printed based on their quality, preventing the printing of substandard panels. Detection during material unloading, based on the weight difference between material handling and unloading, allows for the screening of substandard printed products. Therefore, the overall quality uniformity of the backlight products obtained after printing is controlled.

[0063] To meet the printing path requirements of piezoelectric jet printing, this embodiment also includes a multi-axis frame 3. The multi-axis frame 3 includes two Y-axis slide rails 31 parallel to the upper surface of the mounting platform 11, with an R-axis 22 positioned between the two Y-axis slide rails 31. The multi-axis frame 3 also includes a gantry frame 32, with the bottom ends of the two uprights of the gantry frame 32 slidably connected to the two Y-axis slide rails 31. Along the Y-axis direction, X-axis slide rails 33 are also provided on both sides of the crossbeam of the gantry frame 32. Perpendicular to the X-axis slide rails 33, the multi-axis frame 3 also includes a Z-axis slide rail 34. By setting a gantry frame with the bottom ends of the two uprights slidably connected to the two Y-axis slide rails 31, and providing X-axis slide rails 33 on both sides of the crossbeam of the gantry frame, the gravity load of the printing module 4 can be distributed more evenly compared to the single support point design in a cantilever slide rail, thus resulting in more stable operation of the printing equipment.

[0064] The printing module 4 includes a mounting frame 42 slidably mounted on the Z-axis slide rail 34. The mounting frame 42 is equipped with a micro-adjustment device 43. The micro-adjustment device 43 includes a micro-slide rail 431 parallel to the X-axis slide rail 33 and slidably connected to multiple piezoelectric jet valves 41, and a high-resolution grating 432 for positioning the piezoelectric jet valves 41. By further configuring the micro-slide rail 431 on the mounting frame 42 and providing the corresponding high-resolution grating 432, the position of the piezoelectric jet valves 41 can be flexibly and precisely adjusted. Therefore, its applicability is wider, and it also has higher precision when coating backlight reflective layers on different types of backlight panels.

[0065] Based on this, in order to cooperate with the aforementioned micro-adjustment device 43, the spacing between the piezoelectric jet valves 41 is observed to avoid the technical problem of uneven coating thickness of the backlight reflective layer caused by excessively large or small spacing between the piezoelectric jet valves 41. The printing device of this embodiment also includes a verification system 5 disposed on the upper surface of the mounting plate 142 for verifying the piezoelectric jet valves 41. The verification system 5 includes a third vision module 52 for observing the spacing between the piezoelectric jet valves 41. Therefore, before coating, the distance between the piezoelectric jet valves 41 can be observed through the third vision module 52, and then the position of the piezoelectric jet valves 41 can be precisely adjusted by the micro-adjustment device 43 according to the observation results. In addition, in order to further control the uniformity of the coating thickness of the backlight reflective layer, the verification system 5 of this embodiment also includes a weighing module 51. By setting the weighing module 51, the mass of ink coated by each piezoelectric jet valve 41 at the same time can be kept uniform, so the uniformity of the backlight reflective layer coating thickness of each piezoelectric jet valve 41 is higher, and the reflection effect is more balanced. To increase the accuracy of the piezoelectric injection valve 41, the mounting platform 11 in this embodiment is also equipped with a cleaning device for cleaning the piezoelectric injection valve 41.

[0066] The distance between the piezoelectric jet valve 41 and the backlight plate will have a certain impact on the inkjet range. When the piezoelectric jet valves 41 are staggered along the Z-axis under the same nozzle diameter, it inevitably leads to the technical problem of excessively large repeated coating areas. Therefore, the printing module 4 of this embodiment also includes a Z-axis adjustment device 45 for adjusting the height of the piezoelectric jet valves 41 along the Z-axis. In this embodiment, the Z-axis adjustment device 45 is a Z-axis adjustment slide. To cooperate with the Z-axis adjustment device 45, the printing equipment of this embodiment also includes a needle alignment device 6 for verifying the height of multiple piezoelectric jet valves 41 along the Z-axis. The needle alignment device 6 includes a digital display micro-head slide 61 fixed to the upper surface of the positioning plate 142, an alignment platform 62 fixedly mounted on the digital display micro-head slide 61, and a tool setter 63 provided on the upper surface of the alignment platform 62. By setting the needle alignment device 6, the height of multiple piezoelectric injection valves 41 along the Z-axis can be verified one by one. Based on the verification difference, the Z-axis adjustment device 45 will calibrate the height of the piezoelectric injection valves 41 on the Z-axis, so that the piezoelectric injection valves 41 with the same nozzle diameter are on the same horizontal plane. Therefore, the thickness of the backlight reflective layer obtained after coating is more uniform.

[0067] In the piezoelectric jet printing process, the positional distribution of the printing module 4 relative to the backlight panel directly affects the printing accuracy. Therefore, along the X-axis, the printing module 4 in this embodiment also includes a positioning system 44 disposed at both ends of the fixing frame 42, used to verify the position of the printing module 4 relative to the backlight panel. The positioning system 44 includes a first vision module 441 for coarse positioning of the backlight panel, a second vision module 442 for fine positioning of the backlight panel, and a height detection module 443 for verifying the printing height of the printing module 4 relative to the backlight panel. The positional information fed back by the positioning system 44 can be coordinated with the X-axis slide rail 33, Y-axis slide rail 31, and Z-axis slide rail 34 to adjust the printing position of the printing module 4 relative to the backlight panel in real time. Therefore, the printing module 4 can move more accurately along the planned path to spray the backlight panel, further improving the printing accuracy of the backlight reflective layer. Furthermore, the second vision module 442 can also perform automatic optical inspection of the printed backlight reflective layer, thus ensuring better detail processing and performance of the final product.

[0068] Furthermore, piezoelectric jet printing is a process that converts electrical energy into mechanical energy. Specifically, the piezoelectric ceramic inside the piezoelectric jet valve 41 deforms when subjected to voltage, thereby driving the movement of the ejector pin and causing ink to flow out. Therefore, during high-speed printing, the temperature of the piezoelectric jet valve 41 rises sharply, and the temperature of the ink stored inside the piezoelectric jet valve 41 also rises with the increase in the temperature of the piezoelectric jet valve 41. However, on the one hand, when the ink temperature is too high, the ink is prone to forming residue on the nozzle wall, resulting in uneven ink droplet flow and ultimately affecting the printing effect; on the other hand, when the ink temperature is too high, its fluidity is strong, so the ink coated on the backlight plate is prone to flowing towards the light-emitting diode, which will affect the printing quality of the backlight reflective layer. To address this, the printing device of this embodiment also includes a cooling diversion device 7 for adjusting the ink temperature in the piezoelectric jet valve 41. The cooling diversion device 7 includes a valve body inlet connector 71 connected to the piezoelectric injection valve 41, and an outlet throttle valve 72 for controlling the flow of gas from the piezoelectric injection valve 41; the cooling diversion device 7 also includes an inlet pipe 73 for filling the piezoelectric injection valve 41 with cooling gas through the inlet connector, and an outlet pipe 74 connected to the outlet throttle valve. By providing an air inlet pipe 73 for introducing cooling gas in the cooling distribution device 7, and by providing several valve body air inlet connectors 71 adapted to the piezoelectric jet valves 41 on the air inlet pipe 73 to distribute the cooling gas, the cooling gas can flow into multiple sets of piezoelectric jet valves 41 to cool the ink. Furthermore, the outlet throttle valve 72 controls the circulation time of the gas within the piezoelectric jet valves 41. Therefore, by adjusting the outlet throttle valves of several piezoelectric jet valves 41, the temperature difference between the inks inside different piezoelectric jet valves 41 can be further reduced while lowering the ink temperature, resulting in a better morphology of the backlight reflective layer coating. To further control the cooling effect of the cooling gas, in this embodiment, the air inlet pipe 73 is connected to an inflow solenoid valve for controlling the gas flow rate; the outlet pipe 74 is connected to a detection device for detecting the outflow gas flow rate.

[0069] In addition, to maintain the cleanliness of the equipment and prevent dust from affecting the quality of the final backlight reflective layer, the backlight reflective layer printing equipment in this embodiment is also equipped with an outer cover.

[0070] Example 2

[0071] Please see Figures 1-10 This embodiment discloses a backlight reflective layer printing device, including:

[0072] The frame 1, as the structural foundation of the high-precision printing equipment, is crucial for improving the printing quality of the backlight reflective layer. In this embodiment, the frame 1 includes a mounting platform 11 for mounting the printing components and six support bases 12 evenly distributed on the lower surface of the mounting platform 11. To absorb the vibrations generated by the mounting platform 11 under the drive of the printing components and to prevent environmental vibrations from affecting the printing components mounted on the mounting platform 11, a vibration isolation device 13 is provided between the support bases 12 and the mounting platform 11. The vibration isolation device 13 is an air-floating vibration isolator. To further provide stable support for the mounting platform 11 and reduce the impact of environmental vibrations on the mounting platform 11, a stable platform 14 is formed by enclosing the lower end of the support bases 12. The stable platform 14 includes an enclosure frame 141 disposed between two adjacent support bases 12 and a positioning plate 142 covering the upper end of the enclosure frame 141 and used to define the position of the support bases 12. The arrangement of the enclosure frame 141 and the positioning plate 142 can further limit the positional relationship of the above-mentioned six support bases 12, thus making the installation platform 11 more stable.

[0073] Based on this, considering the load-bearing capacity of the frame 1, the frame 1 in this embodiment also includes a load-distribution component 15 for dispersing the weight of the frame 1. Specifically, the load-distribution component 15 includes a load plate 151 disposed at the bottom of the stable platform 14 and the support base 12, and heavy-duty feet 152 evenly distributed on the lower surface of the load plate 151. By setting the load-distribution component 15, the weight load of the main structure of the printing device can be distributed to the entire load plate 151, thereby alleviating the supporting pressure on the support base 12 and avoiding stress concentration. Therefore, the overall stability of the frame 1 is higher and its service life is longer. In addition, the design of evenly distributing the heavy-duty feet 152 on the lower surface of the load plate 151 can also level the load plate 151 and ensure the levelness of the mounting platform 11.

[0074] The adsorption platform 2 includes a substrate 21 for fixing the backlight panel. The stability and reliability of the substrate 21, which serves as the plane for fixing the backlight panel, directly affect the spraying accuracy of the piezoelectric jet valve 41. In this embodiment, an R-axis bracket 22 is fixedly mounted on the mounting platform 11 below the substrate 21 and corrects the printing position of the backlight panel. By fixing the R-axis bracket 22 between the high-stability frame 1 and the substrate 21, the vibration of the substrate 21 caused by its rotation can be quickly absorbed, resulting in higher printing accuracy.

[0075] Based on this, the adsorption platform 2 in this embodiment also includes a transport assembly 23 for picking up and placing backlight panels. The transport assembly 23 includes a lifting rod 231 for supporting the backlight panels. The bottom end of the lifting rod 231 is connected to a lifting plate 232 that is penetrated by the R-axis frame 22. A drive motor 233 is provided at the lower end of the lifting plate 232. The surface of the drive motor 233 is provided with a guide post 2331 that penetrates the lifting plate 232 and is fixedly connected to the lower surface of the substrate 21. The guide post 2331 is provided with a drive block 2332 that is connected to the lower surface of the lifting plate 232 to drive the lifting plate 232 to move up and down. The substrate 21 is provided with a through hole for the upper end of the lifting rod 231 to pass through. By setting the transport assembly 23, the adsorption platform 2 is given the function of picking up and placing backlight panels, which to a certain extent avoids the vibration of the mounting platform 11 caused by directly picking up and placing backlight panels by lifting the substrate 21. Specifically, during the material handling process, the drive block 2332, driven by the drive motor 233, pushes the lifting plate 232 upward along the guide column 2331, so that the lifting rod 231 set on the upper surface of the lifting plate 232 passes through the through hole of the substrate 21 until it contacts the lower surface of the backlight panel of the feeding module set on the upper substrate. Then, the drive block 2332 is driven by the drive motor 233 to move downward until the backlight panel at the upper end of the lifting rod 231 is placed on the upper surface of the substrate 21, at which point the material handling is completed.

[0076] To secure the backlight panel before printing and prevent displacement during the printing process, the adsorption platform 2 in this embodiment further includes an adsorption assembly 24 for securing the substrate 21. The adsorption assembly 24 includes adsorption holes 241 disposed on the substrate 21 and a solenoid valve 242 for controlling the opening and closing of the adsorption holes 241. By using the adsorption assembly 24 and the solenoid valve 242 to control the fixation of the backlight panel by the adsorption holes 241, the impact of contact fixation on the backlight panel performance can be minimized while ensuring reliable fixation. Therefore, the quality of the product prepared after coating is more guaranteed. Furthermore, to further optimize the adsorption efficiency of the adsorption assembly 24 on the substrate 21 and increase its flexibility of use, the adsorption holes 241 in this embodiment are evenly distributed outwards from the center point of the upper surface of the substrate 21 to form different adsorption zones, thereby adapting to the adsorption of backlight panels of different sizes.

[0077] Piezoelectric jet printing of the backlight reflective layer is an additive printing technology. Therefore, the quality of the additive manufacturing not only affects the quality of the printed product but also the performance differences between batches of printed products. To address this, in this embodiment, the adsorption platform 2 also includes a patch gravity sensor 25 disposed on the upper surface of the substrate 21 for measuring the weight of the backlight panel. By disposing of the patch gravity sensor 25 on the upper surface of the substrate 21, the quality of the backlight product can be detected during material handling and unloading. Detection during material handling allows for the screening of backlight panels to be printed based on their quality, preventing the printing of substandard panels. Detection during material unloading, based on the weight difference between material handling and unloading, allows for the screening of substandard printed products. Therefore, the overall quality uniformity of the backlight products obtained after printing is controlled.

[0078] To meet the printing path requirements of piezoelectric jet printing, this embodiment also includes a multi-axis frame 3. The multi-axis frame 3 includes two Y-axis slide rails 31 parallel to the upper surface of the mounting platform 11, with an R-axis 22 positioned between the two Y-axis slide rails 31. The multi-axis frame 3 also includes a gantry frame 32, with the bottom ends of the two uprights of the gantry frame 32 slidably connected to the two Y-axis slide rails 31. Along the Y-axis direction, X-axis slide rails 33 are also provided on both sides of the crossbeam of the gantry frame 32. Perpendicular to the X-axis slide rails 33, the multi-axis frame 3 also includes a Z-axis slide rail 34. By setting a gantry frame with the bottom ends of the two uprights slidably connected to the two Y-axis slide rails 31, and providing X-axis slide rails 33 on both sides of the crossbeam of the gantry frame, the gravity load of the printing module 4 can be distributed more evenly compared to the single support point design in a cantilever slide rail, thus resulting in more stable operation of the printing equipment.

[0079] The printing module 4 includes a mounting frame 42 slidably mounted on the Z-axis slide rail 34. The mounting frame 42 is equipped with a micro-adjustment device 43. The micro-adjustment device 43 includes a micro-slide rail 431 parallel to the X-axis slide rail 33 and slidably connected to multiple piezoelectric jet valves 41, and a high-resolution grating 432 for positioning the piezoelectric jet valves 41. By further configuring the micro-slide rail 431 on the mounting frame 42 and providing the corresponding high-resolution grating 432, the position of the piezoelectric jet valves 41 can be flexibly and precisely adjusted. Therefore, its applicability is wider, and it also has higher precision when coating backlight reflective layers on different types of backlight panels.

[0080] Based on this, in order to cooperate with the aforementioned micro-adjustment device 43, the spacing between the piezoelectric jet valves 41 is observed to avoid the technical problem of uneven coating thickness of the backlight reflective layer caused by excessively large or small spacing between the piezoelectric jet valves 41. The printing device of this embodiment also includes a verification system 5 disposed on the upper surface of the mounting plate 142 for verifying the piezoelectric jet valves 41. The verification system 5 includes a third vision module 52 for observing the spacing between the piezoelectric jet valves 41. Therefore, before coating, the distance between the piezoelectric jet valves 41 can be observed through the third vision module 52, and then the position of the piezoelectric jet valves 41 can be precisely adjusted by the micro-adjustment device 43 according to the observation results. In addition, in order to further control the uniformity of the coating thickness of the backlight reflective layer, the verification system 5 of this embodiment also includes a weighing module 51. By setting the weighing module 51, the mass of ink coated by each piezoelectric jet valve 41 at the same time can be kept uniform, so the uniformity of the backlight reflective layer coating thickness of each piezoelectric jet valve 41 is higher, and the reflection effect is more balanced. To increase the accuracy of the piezoelectric injection valve 41, the mounting platform 11 in this embodiment is also equipped with a cleaning device for cleaning the piezoelectric injection valve 41.

[0081] The distance between the piezoelectric jet valve 41 and the backlight plate will have a certain impact on the inkjet range. When the piezoelectric jet valves 41 are staggered along the Z-axis under the same nozzle diameter, it inevitably leads to the technical problem of excessively large repeated coating areas. Therefore, the printing module 4 of this embodiment also includes a Z-axis adjustment device 45 for adjusting the height of the piezoelectric jet valves 41 along the Z-axis. In this embodiment, the Z-axis adjustment device 45 is a Z-axis adjustment slide. To cooperate with the Z-axis adjustment device 45, the printing equipment of this embodiment also includes a needle alignment device 6 for verifying the height of multiple piezoelectric jet valves 41 along the Z-axis. The needle alignment device 6 includes a digital display micro-head slide 61 fixed to the upper surface of the positioning plate 142, an alignment platform 62 fixedly mounted on the digital display micro-head slide 61, and a tool setter 63 provided on the upper surface of the alignment platform 62. By setting the needle alignment device 6, the height of multiple piezoelectric injection valves 41 along the Z-axis can be verified one by one. Based on the verification difference, the Z-axis adjustment device 45 will calibrate the height of the piezoelectric injection valves 41 on the Z-axis, so that the piezoelectric injection valves 41 with the same nozzle diameter are on the same horizontal plane. Therefore, the thickness of the backlight reflective layer obtained after coating is more uniform.

[0082] In the piezoelectric jet printing process, the positional distribution of the printing module 4 relative to the backlight panel directly affects the printing accuracy. Therefore, along the X-axis, the printing module 4 in this embodiment also includes a positioning system 44 disposed at both ends of the fixing frame 42, used to verify the position of the printing module 4 relative to the backlight panel. The positioning system 44 includes a first vision module 441 for coarse positioning of the backlight panel, a second vision module 442 for fine positioning of the backlight panel, and a height detection module 443 for verifying the printing height of the printing module 4 relative to the backlight panel. The positional information fed back by the positioning system 44 can be coordinated with the X-axis slide rail 33, Y-axis slide rail 31, and Z-axis slide rail 34 to adjust the printing position of the printing module 4 relative to the backlight panel in real time. Therefore, the printing module 4 can move more accurately along the planned path to spray the backlight panel, further improving the printing accuracy of the backlight reflective layer. Furthermore, the second vision module 442 can also perform automatic optical inspection of the printed backlight reflective layer, thus ensuring better detail processing and performance of the final product.

[0083] Furthermore, piezoelectric jet printing is a process that converts electrical energy into mechanical energy. Specifically, the piezoelectric ceramic inside the piezoelectric jet valve 41 deforms when subjected to voltage, thereby driving the movement of the ejector pin and causing ink to flow out. Therefore, during high-speed printing, the temperature of the piezoelectric jet valve 41 rises sharply, and the temperature of the ink stored inside the piezoelectric jet valve 41 also rises with the increase in the temperature of the piezoelectric jet valve 41. However, on the one hand, when the ink temperature is too high, the ink is prone to forming residue on the nozzle wall, resulting in uneven ink droplet flow and ultimately affecting the printing effect; on the other hand, when the ink temperature is too high, its fluidity is strong, so the ink coated on the backlight plate is prone to flowing towards the light-emitting diode, which will affect the printing quality of the backlight reflective layer. To address this, the printing device of this embodiment also includes a cooling diversion device 7 for adjusting the ink temperature in the piezoelectric jet valve 41. The cooling diversion device 7 includes a valve body inlet connector 71 connected to the piezoelectric injection valve 41, and an outlet throttle valve 72 for controlling the flow of gas from the piezoelectric injection valve 41; the cooling diversion device 7 also includes an inlet pipe 73 for filling the piezoelectric injection valve 41 with cooling gas through the inlet connector, and an outlet pipe 74 connected to the outlet throttle valve. By providing an air inlet pipe 73 for introducing cooling gas in the cooling distribution device 7, and by providing several valve body air inlet connectors 71 adapted to the piezoelectric jet valves 41 on the air inlet pipe 73 to distribute the cooling gas, the cooling gas can flow into multiple sets of piezoelectric jet valves 41 to cool the ink. Furthermore, the outlet throttle valve 72 controls the circulation time of the gas within the piezoelectric jet valves 41. Therefore, by adjusting the outlet throttle valves of several piezoelectric jet valves 41, the temperature difference between the inks inside different piezoelectric jet valves 41 can be further reduced while lowering the ink temperature, resulting in a better morphology of the backlight reflective layer coating. To further control the cooling effect of the cooling gas, in this embodiment, the air inlet pipe 73 is connected to an inflow solenoid valve for controlling the gas flow rate; the outlet pipe 74 is connected to a detection device for detecting the outflow gas flow rate.

[0084] In addition, to maintain the cleanliness of the equipment and prevent dust from affecting the quality of the final backlight reflective layer, the backlight reflective layer printing equipment in this embodiment is also equipped with an outer cover.

Claims

1. A backlight reflection layer printing device, characterized in that Comprising: A frame (1), the frame (1) includes an installation platform (11), and a plurality of support bases (12) for supporting the installation platform (11); a vibration isolation device (13) is provided at the upper end of the support base (12) and is in contact with the lower surface of the installation platform (11); a stable platform (14) is formed by enclosing the lower ends of the support bases (12); the stable platform (14) includes an enclosing frame (141) provided between adjacent support bases (12), and a clamping plate (142) covering the upper end of the enclosing frame (141) and used for limiting the position of the support base (12); An adsorption platform (2), the adsorption platform (2) includes a substrate (21) for fixing a backlight panel; an R-axis frame (22) is fixedly installed below the substrate (21) on the installation platform (11) and is used for correcting the printing position of the backlight panel; A multi-axis frame (3), the multi-axis frame (3) includes two Y-axis slide rails (31) arranged in parallel on the upper surface of the installation platform (11), and the R-axis frame (22) is arranged between the two Y-axis slide rails (31); A printing module (4), the printing module (4) is arranged on the multi-axis frame (3) and includes a piezoelectric injection valve (41) for performing coating printing; The adsorption platform (2) further includes a handling component (23) for picking up and placing the backlight panel, the handling component (23) includes a lifting rod (231) for carrying the backlight panel, the bottom end of the lifting rod (231) is connected to a lifting plate (232) penetrated by the R-axis frame (22), a driving motor (233) is arranged at the lower end of the lifting plate (232), a guiding column (2331) penetrating the lifting plate (232) and fixedly connected to the lower surface of the substrate (21) is arranged on the surface of the driving motor (233), and a driving block (2332) contacting the lower surface of the lifting plate (232) to drive the lifting plate (232) to move up and down is arranged on the guiding column (2331); a through hole for the upper end of the lifting rod (231) to pass through is arranged on the substrate (21).

2. The printing device according to claim 1, wherein The frame (1) further includes a load dispersion component (15) arranged at the bottom end of the support base (12) and used for dispersing the gravity of the frame (1); the load dispersion component (15) includes a load plate (151) arranged at the bottom end of the support base (12), and heavy-duty feet (152) evenly distributed on the lower surface of the load plate (151).

3. The printing device according to claim 1, wherein The adsorption platform (2) further includes an adsorption component (24) for fixing the substrate (21); the adsorption component (24) includes adsorption holes (241) arranged on the substrate (21), and a solenoid valve (242) for controlling the opening and closing of the adsorption holes (241).

4. The printing device according to claim 1, wherein The adsorption platform (2) further includes a patch gravity sensor (25) arranged on the upper surface of the substrate (21) and used for measuring the weight of the backlight panel.

5. The printing device according to claim 1, wherein The multi-axis axis frame (3) further includes a gantry (32), and the bottoms of the two columns of the gantry (32) are respectively in sliding contact with the two Y-axis slide rails (31); along the Y-axis direction, an X-axis slide rail (33) is further provided on one side or both sides of the cross beam of the gantry (32); perpendicular to the X-axis slide rail (33), the multi-axis axis frame (3) is further provided with a Z-axis slide rail (34); the printing module (4) is installed on the Z-axis slide rail (34).

6. The printing device according to claim 5, wherein The printing module (4) includes a fixing frame (42) slidably installed on the Z-axis slide rail (34), and a macro adjustment device (43) for adjusting the position of the piezoelectric injection valve is provided on the fixing frame (42); the macro adjustment device (43) includes a macro slide rail (431) arranged parallel to the X-axis slide rail (33) and slidably connected with a plurality of piezoelectric injection valves (41), and a high-resolution grating (432) for positioning the positions of the piezoelectric injection valves (41).

7. The printing device according to claim 6, wherein Along the X-axis direction, the printing module (4) further includes a positioning system (44) provided at both ends of the fixing frame (42) and used for checking the position of the printing module (4) relative to the backlight panel; the positioning system (44) includes a first vision module (441) for coarsely positioning the position of the backlight panel, a second vision module (442) for finely positioning the position of the backlight panel, and a height detection module (443) for checking the printing height of the printing module (4) relative to the backlight panel.

8. The printing device according to claim 6, wherein The printing device further includes an approval system (5) for calibrating the piezoelectric injection valve (41); the approval system (5) includes a weighing module (51) for measuring the flow rate of the piezoelectric injection valve (41), and a third vision module (52) for observing the spacing between the piezoelectric injection valves (41).

9. The printing device according to claim 7, characterized in that, The printing module (4) further includes a Z-direction adjustment device (45) for adjusting the height of the piezoelectric injection valve (41) along the Z-axis direction; the printing device further includes a needle alignment device (6) for verifying the heights of the plurality of piezoelectric injection valves (41) along the Z-axis direction.

10. The printing device according to claim 9, wherein The needle alignment device (6) includes a digital display differential head slide (61) fixed on the upper surface of the clamping plate (142), a counterpoint platform (62) is fixedly installed on the digital display differential head slide (61), and a tool setting instrument (63) is arranged on the upper surface of the counterpoint platform (62).

11. The printing device according to claim 1, wherein The printing device further includes a cooling and shunting device (7) for adjusting the ink temperature in the piezoelectric injection valve (41); the cooling and shunting device (7) includes a valve body air inlet joint (71) connected to the piezoelectric injection valve (41), and an air outlet throttle valve (72) for controlling the outflow of gas from the piezoelectric injection valve (41); the cooling and shunting device (7) further has an air inlet pipe (73) for filling cooling gas into the piezoelectric injection valve (41) through the air inlet joint (71), and an air outlet pipe (74) connected to the air outlet throttle valve (72).

12. The printing device according to claim 11, wherein The inlet pipe (73) is connected to an inflow solenoid valve for controlling the gas flow rate; the outlet pipe (74) is connected to a detection device for detecting the outflow gas flow rate.

13. The application of the printing equipment according to any one of claims 1 to 12 in the preparation of Mini-LED backlight reflective layer.

14. A display screen, characterized in that, It includes a backlight reflective layer, which is prepared using the printing equipment described in any one of claims 1 to 13.

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