Printing device and method for LED retaining wall of display panel

Abstract

The present invention provides a printing apparatus and method for LED retaining walls of display panels, which includes a motion control system configured to control printing of a target LED retaining wall on the upper surface of a target substrate in a target workstation, a suction device configured to suck the lower surface of the target substrate to a suction cup by a vacuum pump, a measurement system including a sensor and a sensor controller configured to measure flatness data of the target substrate, a Z-axis controller configured to control a print receiving distance between a target multi-needle module and the upper surface of the target substrate, a target multi-needle module including a printing needle and a fluid control system configured to provide a preset air pressure parameter to the printing needle, and a target workstation configured to accommodate the target substrate so that the target multi-needle module performs layered printing of the target LED retaining wall on the upper surface of the target substrate. The printing apparatus and method for LED retaining walls of display panels provided by the present invention improves the manufacturing efficiency and accuracy of the LED retaining wall.

Description

[Technical field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application having application number CN202210292190.3 filed on March 24, 2022, and Chinese patent application having application number CN202210203951.3 filed on March 03, 2022, the entire contents of which are incorporated herein by reference.

[0003] The present invention relates to the technical field of display panel processing, and in particular to a printing device and method for LED retaining wall of a display panel. [Background technology]

[0004] Submillimeter-wave light-emitting diodes (Mini-LEDs) and micro-light-emitting diodes (Micro-LEDs) have display advantages such as high light-emitting efficiency, high contrast, and are characterized by long life and stable performance. At the same time, their relatively simple manufacturing process and technical overview will make them the mainstream display technology to replace liquid crystal displays (LCDs) and organic light-emitting diodes (OLEDs) in the future.

[0005] At present, the technology of using gallium nitride to manufacture blue diodes is relatively mature, but red diodes are expensive to manufacture and less effective, so at this stage, color-changing particles are used in blue diodes (red phosphor powder or green phosphor powder) to make the blue diode emit red light or green light. In order to prevent color mixing of different color-changing particles in adjacent subpixels, it is necessary to build a retaining wall around each LED to prevent color crosstalk when different color-changing particles are injected, thereby improving color purity.

[0006] Although inorganic LEDs are shrinking, their size is still at the level of several tens of microns. For Mini-LED products, the LED height is about 110μm, and the height of the retaining wall needs to be more than 120μm. If traditional photolithography processes are used, the retaining wall needs to be manufactured through steps such as bonding, exposure, and development. Calculated at 1μm / min, it takes more than 100 minutes to manufacture the retaining wall of a single-sided panel, which is extremely low in efficiency and cannot guarantee spectrum consistency. For Micro-LED products, the gap between LEDs is smaller, and traditional photolithography processes face greater challenges when applied to the manufacture of Micro-LED retaining walls.

[0007] Light-emitting diodes (LEDs), abbreviated as LEDs, are common light-emitting devices that emit light by emitting energy through the combination of electrons and holes. Light-emitting diodes can efficiently convert electrical energy into light energy, and are widely used in modern society for lighting, tablet displays, medical equipment, etc.

[0008] In particular, adding retaining walls to LED displays is an effective way to improve the luminous performance of the display, and the retaining walls need to be fabricated in the slits between the LEDs, and require a certain height, positional accuracy and consistency.

[0009] Conventional retaining wall manufacturing methods include screen printing and transfer printing, etc., and a method of using 3D printing to manufacture retaining walls has not yet been proposed. The screen printing process designed to manufacture retaining walls is only suitable for planar substrates, and its printed aspect is relatively small, so retaining walls need to be manufactured through multiple printing and curing, which makes multiple alignments difficult in the molding process and requires yield consideration. The minimum width of the printing route is relatively wide and is generally only suitable for planar substrates. However, transfer printing designed to manufacture retaining walls also has problems such as difficulty in alignment during transfer printing and difficulty in transfer printing of routes with high width-to-height ratios.

[0010] Chinese Patent No. CN201210166648.7 discloses a method for manufacturing an LED sealing retaining wall, which includes the steps of: providing a ceramic substrate; providing a soft mold; providing a photosensitive ceramic slurry material; forming a plurality of electrode sets on the ceramic substrate, and filling the photosensitive ceramic slurry material into the mold groove; aligning the molds filled with the photosensitive ceramic slurry material with each of the electrodes, and then pressing the soft mold onto the ceramic substrate; curing the photosensitive ceramic slurry material in the mold groove to form a retaining wall by a UV curing method, and simultaneously pressing the soft mold, so that the photosensitive ceramic slurry material is cured into the retaining wall and fixed and bonded to the ceramic substrate; and removing the soft mold.

[0011] The retaining wall manufacturing method disclosed above uses a mold to manufacture an LED sealed retaining wall, and due to the small size of the diode, the precision of the method disclosed above is limited, it is not suitable for LED retaining wall printing, the yield is low, and the method disclosed above does not disclose a mounting module, nor does it disclose a method to achieve better positioning of the diode during the printing process. Summary of the Invention [Problem to be solved by the invention]

[0012] The present invention solves the defect of the prior art in that high-precision retaining walls cannot be manufactured with narrow LED gaps, and provides a printing device and method for LED retaining walls of display panels, which realizes the manufacturing efficiency and accuracy of LED retaining walls.

[0013] The present invention relates to

[0014] a motion control system connected to the control terminal and configured to control printing of a target LED retaining wall on a top surface of the target substrate at the target workstation;

[0015] a suction device connected to the motion control system and configured to suction a lower surface of the target substrate to a suction cup by a vacuum pump;

[0016] a measurement system including a sensor and a sensor controller connected to the control terminal and configured to measure planarity data of the target substrate;

[0017] a Z-axis controller connected to the control terminal and configured to control a print receiving distance between a target multi-needle module and a top surface of the target substrate;

[0018] the target multi-needle module including the printing needle and a fluid control system connected to the Z-axis controller and configured to provide pre-set air pressure parameters to the printing needle;

[0019] a target workstation connected to the motion control system to accommodate a target substrate such that the target multi-needle module performs layered printing of a target LED retaining wall on a top surface of the target substrate;

[0020] Here, a printing apparatus for an LED retaining wall of a display panel is provided, wherein the target workstation includes a first workstation and / or a second workstation, the target LED retaining wall includes a horizontal LED retaining wall and a vertical LED retaining wall, the target multi-needle module includes a first module and / or a second module, the first module matches the first workstation and the second module matches the second workstation, and the target substrate includes a PCB substrate or a glass substrate.

[0021] According to the display panel LED wall printing device provided by the present invention, the target workstation includes:

[0022] a cleaning area configured to clean and store the printing needles;

[0023] and a pre-printing area configured to perform pre-printing with preset air pressure parameters and control the suction device to move away from the pre-printing area by the motion control system until the printing needle is stably discharged.

[0024] According to the printing device for LED retaining wall of a display panel provided by the present invention, the motion control system specifically controls the suction device to move in an XY plane when the target work station includes a first work station and a second work station, so that the first module prints the vertical LED retaining wall on the target substrate in the first work station;

[0025] By sending a first movement command to the suction device, the suction device is configured to transfer and move the target substrate within the XY plane of the second workstation according to the first movement command, and the second module is configured to print the lateral LED retaining wall on the target substrate at the second workstation.

[0026] According to the printing device of the LED retaining wall of the display panel provided by the present invention, the motion control system specifically controls the suction device to move in the XY plane when the target workstation includes a first workstation or a second workstation, so that the target multi-needle module prints the vertical LED retaining wall on the target substrate in the target workstation;

[0027] By sending a second movement command to the target workstation, the target workstation rotates 90° according to the second movement command, and then the suction device is driven to move in the XY plane, so that the target multi-needle module is configured to print the lateral LED retaining wall on the target substrate at the target workstation.

[0028] According to the printing device for the LED retaining wall of the display panel provided by the present invention, it includes one or more of the Z-axis controllers.

[0029] The present invention relates to

[0030] For a printing task, a pre-printing preparatory operation is performed, and the target substrate is scanned by a measuring system of a printing device of an LED retaining wall of a display panel to obtain flatness data of the target substrate;

[0031] moving a target multi-needle module to an initial printing position on a target substrate by the motion control system, and adjusting a printing receiving distance of the target multi-needle module by a Z-axis controller based on the received flatness data;

[0032] According to a preset air pressure parameter and a target line width, a layer printing is performed on the upper surface of the target substrate in the target workstation by the target multi-needle module, and a target LED retaining wall is cured and generated under the condition that the printing height is within a target height range;

[0033] Here, the present invention further provides a printing method for an LED retaining wall of a display panel, wherein the target workstation includes a first workstation and / or a second workstation, the target LED retaining wall includes a horizontal LED retaining wall and a vertical LED retaining wall, the target multi-needle module includes a first module and / or a second module, the printing height is a cumulative layer height corresponding to the number of printed layers, and the printing task includes determining a target line width and a target height according to at least the target substrate.

[0034] According to the display panel LED retaining wall printing method provided by the present invention, the method includes adjusting the printing receiving distance of the target multi-needle module by a Z-axis controller according to the received flatness data;

[0035] According to the flatness data and the target corresponding relationship, obtain a vertical distance between each printing position of the target substrate and the target multi-needle module as an actual value of a printing receiving distance;

[0036] and adjusting the actual value of the print receiving distance to the target value of the print receiving distance by the Z-axis controller when the target multi-needle module is located at the print position;

[0037] Here, the target value of the print receiving distance corresponding to each of the print positions is the same.

[0038] According to the printing method for the LED retaining wall of the display panel provided by the present invention, the preliminary operation before printing is performed,

[0039] After filling a syringe with a printing material, attaching the printing needle to the syringe and connecting the syringe to the fluid control system through the printing needle;

[0040] and controlling the motion control system by a control terminal to perform a mechanical reset operation;

[0041] Here, the printing material matches the width-height ratio formed by the printing material, the inner diameter parameter of the printing needle matches the target line width, and the number of printing layers is set based on the width-height ratio of the target LED retaining wall, the target line width and the target height.

[0042] According to the printing method for LED retaining walls of display panels provided by the present invention, before the motion control system moves the target multi-needle module to the initial printing position of the target substrate, pre-printing is performed with preset air pressure parameters, and the motion control system controls the suction device to move away from the pre-printing area until the printing needles are stably discharged.

[0043] According to the printing method of the LED retaining wall of the display panel provided by the present invention, the target multi-needle module performs lamination printing on the upper surface of the target substrate in the target workstation based on the preset air pressure parameters and the target line width, and hardens and generates the target LED retaining wall under the condition that the printing height is within the target height range:

[0044] According to the preset air pressure parameters and the target line width, the first module performs lamination printing on the upper surface of the target substrate in the first workstation, and when the printing height meets the target height, a vertical LED retaining wall is generated;

[0045] The second module performs layer printing on the upper surface of the target substrate at the second workstation based on the preset air pressure parameters and the target line width, and generates a lateral LED retaining wall when the printing height meets the target height.

[0046] According to the printing method of the LED retaining wall of the display panel provided by the present invention, the target multi-needle module performs lamination printing on the upper surface of the target substrate in the target workstation based on the preset air pressure parameters and the target line width, and hardens and generates the target LED retaining wall under the condition that the printing height is within the target height range:

[0047] According to the preset air pressure parameters and the target line width, the target multi-needle module performs lamination printing on the upper surface of the target substrate at the first workstation or the second workstation, and generates a vertical LED retaining wall when the printing height meets the target height;

[0048] rotating the first workstation or the second workstation 90 degrees, causing the target multi-needle module to perform layer printing on the top surface of the target substrate, and generating a lateral LED retaining wall if the printing height meets the target height.

[0049] The present invention further provides an electronic device comprising a memory, a processor and a computer program stored in the memory and executed by the processor, which performs the printing method for an LED retaining wall of a display panel described in any one of the above when the processor executes the program.

[0050] The present invention further provides a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, performs the method for printing an LED retaining wall of a display panel according to any one of the above.

[0051] The invention further provides a computer program product comprising a computer program which, when executed by a processor, performs the method for printing an LED retaining wall of a display panel according to any one of the above.

[0052] The printing apparatus and method for the LED retaining wall of the display panel provided by the present invention controls the target multi-needle module in the target workstation based on the Z-axis controller, and controls the motion process in the XY plane of the target substrate by the motion control system, so that the target multi-needle module adjusts the printing receiving distance in each printing position, and then uses direct-writing 3D printing technology to manufacture the target LED retaining wall with uniform width and high verticality through stacking printing in the target substrate. The manufacturing efficiency and accuracy of the LED retaining wall can be improved. In addition, the construction of a retaining wall with uniform height and width around the sub-pixel can prevent light leakage and at the same time enhance the contrast of the LED display, and the gain is more obvious for Mini-LED products and Micro-LED products.

[0053] SUMMARY OF THE PRESENT DISCLOSURE In order to overcome the above-mentioned deficiencies in the prior art, the present invention provides a printing device for LED sealed retaining walls with high precision and a large printing width-to-height ratio. [Means for solving the problem]

[0054] In order to achieve the above object of the invention, the present invention uses the following technical solution: A printing device for LED sealed retaining wall, comprising a processing table and a three-axis motion module connected to a corresponding print head module and installed on the processing table, the three-axis motion module includes a horizontal motion module connected to the processing table and a lifting motion module installed across the processing table, the print head module is located on the lifting motion module, the horizontal motion module is provided with a placement module corresponding to the print head module, the placement module includes a base, a three-axis rotating platform and a vacuum suction cup installed from bottom to top, a suction groove is formed on the surface of the vacuum suction cup, a number of protrusions are formed in the suction groove, and a number of positioning pins are provided at the corners of the vacuum suction cup, the number of positioning pins are located on two adjacent sides of the vacuum suction cup, and the processing table is further provided with a visual and measuring device corresponding to the placement module.

[0055] In a preferred embodiment of the present invention, the processing table is formed with a gantry, the lifting motion module is mounted on the gantry, and the print head module and the vision and measuring device are both mounted on the gantry.

[0056] In a preferred embodiment of the present invention, a plurality of suction holes are formed in the suction groove, the suction holes are formed symmetrically along the center of the suction groove, and a vacuum pressure regulating valve communicating with the suction holes is attached to the lower part of the vacuum suction cup.

[0057] In a preferred embodiment of the invention, at least two locating pins are provided on each of adjacent sides of the vacuum suction cup.

[0058] In a preferred embodiment of the present invention, the print head module includes a material extrusion device, a needle clamp and a printing needle connected in order from top to bottom, the needle clamp is fixedly connected to the lifting motion module, the material extrusion device is fixedly connected to the needle clamp, and the printing needle is connected to the bottom of the needle clamp.

[0059] In a preferred embodiment of the present invention, the needle clamp includes a hug hoop bracket and a connector connected to the bottom of the hug hoop bracket, and a hug hoop is formed on the top of the hug hoop bracket to fit over the material extrusion device, and the hug hoop clamps the material extrusion device.

[0060] In a preferred embodiment of the invention, the upper part of the connector is configured as a Luer female connector connected to the outlet of the material extrusion device, and the lower part of the connector is a Luer male connector connected to the printing needle.

[0061] In a preferred form of the invention, the printed needle comprises a needle base and a ceramic needle tip, the top of the needle base being configured as a corresponding Luer female connector.

[0062] In a preferred form of the invention, the vision and measurement device includes an oblique observation assembly mounted at an angle to the side of the print head module and a sensing and measurement assembly vertically connected to the gantry, with the oblique observation assembly mounted toward the printing needle.

[0063] In a preferred embodiment of the present invention, the processing table is further provided with a corresponding cleaning device and a contact height measuring device. Effect of the Invention

[0064] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0065] 1. The vacuum suction cup adheres to the PCB, improving the flatness of the PCB surface, greatly reducing the difficulty of printing and improving printing efficiency; the vacuum suction cup has a suction groove with the same size as the PCB under the PCB to achieve adhesion to the PCB; in order to prevent deformation caused by excessive suction, as many protrusions as possible are installed in the suction groove to support the contactable area at the bottom of the PCB, improving the flatness of the PCB after suction; and by installing positioning pins, the adjacent two sides of the PCB can simultaneously offset the positioning pins after the PCB is moved to a specific position in the suction groove, thereby realizing the positioning of the PCB.

[0066] 2. After the print head module is raised and lowered to a specific position, the horizontal motion module can be moved to realize direct printing of the print head module on the printed circuit board, so that ultra-small LED retaining walls with line widths of 10 to 200 microns can be quickly manufactured.

[0067] 3. By adjusting the lifting height of the print head module, the production of retaining walls with a large width-to-height ratio can be directly realized through multi-layer printing lamination. [Brief description of the drawings]

[0068] In order to more clearly describe the technical solutions in the present invention or the prior art, the following briefly introduces the drawings necessary for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention, and those skilled in the art can further obtain other drawings based on these drawings without creative efforts. [Figure 1] FIG. 2 is a configuration diagram of a printing device for an LED retaining wall of a display panel provided by the present invention. [Diagram 2] 1 is a process flow chart 1 of the display panel LED retaining wall printing apparatus provided by the present invention; [Diagram 3] 2 is a process flow chart 2 of the display panel LED retaining wall printing apparatus provided by the present invention. [Figure 4]1 is a process flow chart of a printing method for LED retaining walls of a display panel provided by the present invention. [Diagram 5] FIG. 2 is a retaining wall effect diagram of the LED retaining wall printing method of the display panel provided by the present invention. [Figure 6] FIG. 1 is a configuration diagram of an electronic device provided by the present invention. [Figure 7] FIG. 2 is a configuration diagram of a printing device for an LED sealed retaining wall according to the present invention. [Figure 8] FIG. 4 is a diagram showing the configuration of a processing table. [Figure 9] FIG. 2 is a configuration diagram of a placement module. [Figure 10] FIG. 2 is a schematic diagram of a placement module in use; [Figure 11] FIG. 2 is a schematic diagram of the inclined observation assembly in use. [Figure 12] FIG. 4 is a diagram showing the configuration of a needle clamp. [Figure 13] FIG. 2 is a diagram illustrating a configuration of a printing needle. [Figure 14] FIG. 2 is a cross-sectional view of a printing needle. [Figure 15] FIG. 2 is a diagram illustrating a configuration of a cleaning device. [Figure 16] FIG. 2 is a schematic diagram of the sensing and measurement assembly in use. [Figure 17] FIG. 1 is a diagram illustrating the configuration of a contact type height measuring device.

[0069] Symbols on the drawing: processing table 1, gantry 1-1, bottom plate 1-2, three-axis motion module 2, horizontal motion module 2-1, lifting motion module 2-2, placement module 3, base 3-1, three-axis rotating table 3-2, vacuum suction cup 3-3, suction groove 3-4, protrusion 3-5, positioning pin 3-6, intake hole 3-7, printing head module 4, material extrusion device 4-1, needle clamp 4-2, hug hoop bracket 4-2-1, connector 4-2-2, hug hoop 4-2-3, needle base 4-3-1, ceramic needle tip 4-3-2, printing needle 4-3, vision and measurement device 5, tilt observation assembly 5-1, sensing and measurement assembly 5-2, cleaning device 6, contact height measurement device 7. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0070] In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention are described below in accordance with the drawings of the present invention, and it is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, a person skilled in the art can easily obtain all the other embodiments without any creative effort, and all the other embodiments obtained are within the scope of the present invention.

[0071] The terms "first", "second", etc. in the specification and claims of this application are used to distinguish between similar objects, and are not used to describe a particular order or sequence. It should be understood that the data so used are interchangeable where appropriate, so that the embodiments of this application can be practiced in an order other than that shown or described herein, and that the objects distinguished by "first", "second", etc. usually belong to the same kind, and are not limited in number to the objects, e.g., the first object may be one or more.

[0072] It is to be understood that the terminology used in the specification of the present invention is for the purpose of describing particular embodiments only, and is not intended to be limiting of the present invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "one," and "the" are intended to include the plural forms unless the context clearly dictates otherwise.

[0073] The terms "comprising" and "including" indicate the presence of stated features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups thereof.

[0074] 1 is a configuration diagram of a printing device for a LED retaining wall of a display panel provided by the present invention. As shown in FIG. 1, the printing device for a LED retaining wall of a display panel provided by an embodiment of the present invention includes a motion control system 110 connected to a control terminal 100 and configured to control the printing of a target LED retaining wall on an upper surface of a target substrate in a target workstation 160.

[0075] Here, the target LED retaining wall includes a horizontal LED retaining wall and a vertical LED retaining wall, and the target substrate includes a PCB substrate or a glass substrate.

[0076] It should be noted that the target substrate is a substrate having a display panel for printing, where the display panel includes, but is not limited to, a normal LED, a Mini-LED, or a Micro-LED, and the embodiment of the present invention is not specifically limited thereto.

[0077] The top surface of the target substrate houses the LED light-emitting matrix of the display panel, and the printed target LED retaining walls are used to separate two adjacent LED light-emitting components of the LED light-emitting matrix.

[0078] The practice of the present invention is not specifically limited to a target substrate.

[0079] For example, the target substrate may be a PCB substrate, on which an LED light-emitting matrix can be formed in the arrangement of "blue 1-green-blue 2", and after printing the target LED retaining wall in the gap between two adjacent LED light-emitting components, fill the space where all blue 1s are located with fluorescent powder to convert the light-emitting components at this location from blue light to red light, forming a "red-green-blue" light-emitting matrix.

[0080] For example, the target substrate may be a glass substrate, which may be printed with a target LED retaining wall, which defines a plurality of receiving sections, each receiving section may receive a blue LED, and the blue LEDs in the corresponding receiving spaces may be covered with quantum dot light conversion films, which may convert them into red light and green light, respectively, to form a "red-green-blue" light-emitting matrix.

[0081] Specifically, the motion control system 110 in the display panel LED retaining wall printing apparatus is connected to the control terminal 100, which can carry out programming control according to different needs, and different parts in the driving device perform corresponding operations in corresponding process flows to print a complete target LED retaining wall on the target substrate.

[0082] Embodiments of the present invention are not specifically limited to the driving task of motion control system 110 .

[0083] Optionally, the motion control system 110 can drive the target substrate to move along the X-axis and Y-axis of the processing table at the workstation to pre-print the target substrate in a pre-print area and move the target substrate to an initial printing position at the target workstation 160.

[0084] Optionally, the motion control system 110 can drive the target substrate at a predetermined motion speed to perform a printing operation on the target substrate at the target workstation 160 to generate a target LED retaining wall on the top surface of the target substrate.

[0085] Optionally, the motion control system 110 can drive each component to reset the device. The embodiment of the present invention does not list the driving operations of the motion control system 110 one by one here.

[0086] The suction device 120 is connected to the motion control system 110 and configured to suck the lower surface of the target substrate onto a suction cup 122 by means of a vacuum pump 121 .

[0087] It should be noted that the vacuum pump 121 is connected to an air pressure connector on the back side of the suction cup 122 through a gas pipe. The vacuum pump 121 is controlled to a negative pressure by a vacuum solenoid valve to provide the suction cup 122 with an adsorption force.

[0088] Specifically, the suction device 120 in the printing device for the LED retaining wall of the display panel is connected to the motion control system 110, and the underside of the target substrate is placed on the suction cup 122. After confirming that the underside of the target substrate is in complete contact with the suction cup 122, the vacuum solenoid valve is turned on to connect to the vacuum pump 121, so that the target substrate is vacuum-sucked to the suction cup 122, thereby improving the flatness of the entire surface of the target substrate.

[0089] The embodiment of the present invention is not specifically limited to the material of the suction cup 122 .

[0090] Illustratively, the material of the suction cup 122 may be a metallic material having a certain rigidity and corrosion resistance, such as aluminum and other synthetic metals.

[0091] The material of the suction cup 122 may be a non-metallic material having a certain rigidity and corrosion resistance, such as ceramic, graphite or marble.

[0092] It should be understood that operations such as fastening the target substrate to the suction cup, removing the target substrate, or re-fastening the target substrate to the suction cup can be completed manually by an operator or by a mechanical arm controlled by a control terminal, and the present invention is not limited thereto.

[0093] The measurement system 130 is connected to the control terminal 100 and includes a sensor 131 and a sensor controller 132 configured to measure planarity data of a target substrate.

[0094] Specifically, the measurement system 130 in the display panel LED retaining wall printing apparatus includes a sensor 131 and a sensor controller 132, each connected to the control terminal 100, for rapidly scanning the entire target substrate and recording the flatness data of the substrate.

[0095] The sensor controller 132 generates a scanning route for the sensor 131 according to an instruction received from the control terminal 100, so that after the sensor 131 is fixed at a certain height on the Z axis, the sensor 131 is perpendicular to the horizontal platform of the workstation (i.e., the plane formed by the X axis and the Y axis), and based on the plane, traverses and scans each printing position on the top surface of the target substrate based on the scanning route, records the reference vertical distance between the sensor 131 and each printing position as flatness data, and stores it in the local database of the control terminal 100.

[0096] Here, the flatness data includes position information of each print position and a corresponding reference vertical distance.

[0097] Embodiments of the present invention are not specifically limited to the type of sensor 131 .

[0098] Illustratively, the sensor 131 may be a distance measurement sensor based on the Time of Flight principle, which uses the speed of light of a modulated light beam and the round trip propagation time over the distance of the object to determine the distance of the object.

[0099] Exemplarily, the sensor 131 may be a distance measuring sensor based on geometric triangulation principles.

[0100] The Z-axis controller 140 is connected to the control terminal 100 and configured to control the print receiving distance between the target multi-needle module 150 and the top surface of the target substrate.

[0101] It should be noted that the Z-axis controller 140 is connected to the control terminal 100, and the control terminal retrieves the flatness data stored locally by the software, generates an adjustment policy for the print receiving distance, and sends it to the Z-axis controller 140.

[0102] Specifically, the Z-axis controller 140 in the display panel LED retaining wall printing device is connected to the target multi-needle module 150, and the Z-axis controller 140 receives the adjustment policy sent from the control terminal 100 and adjusts the printing receiving distance between the target multi-needle module 150 and each printing position on the top surface of the target substrate.

[0103] The print receiving distance refers to the reference vertical distance between the target multi-needle module 150 and any print position on the target substrate in the printing process, and the adjustment policy makes the print receiving distance of each print position consistent.

[0104] Target multi-needle module 150 is connected to Z-axis controller 140 and includes a printing needle 150-1 and a fluid control system 150-2 configured to provide pre-set pneumatic parameters to printing needle 150-1.

[0105] Here, the target multi-needle module 150 includes a first module 151 and / or a second module 152 .

[0106] It should be noted that the target multi-needle module 150 is vertically fixed at a certain distance from the top surface of the target substrate via a mechanical structure.

[0107] Specifically, the target multi-needle module 150 in the display panel LED retaining wall printing device is connected to the Z-axis controller 140, and the target multi-needle module 150 traverses each printing position to adjust the printing receiving distance according to the pre-acquired printing receiving distance adjustment policy during the movement process of the suction device transporting the target substrate, and is driven to print.

[0108] Here, the target multi-needle module 150 includes one or more printing needles 150-1 and a fluid control system 150-2.

[0109] Embodiments of the present invention are not specifically limited to the type of printing needle 150-1 and fluid control system 150-2.

[0110] For example, the material of the printing needle 150-1 includes, but is not limited to, ceramic, glass, resin, steel, etc., and its slurry discharge passage is wide at the top and narrow at the bottom, which can reduce the slurry blocking force and ensure that each needle of the multi-needle module discharges stably and at the same discharge speed. In addition, the inner diameter of the lower port of the slurry discharge passage is the printing needle 150-1, and the inner diameter parameters of each printing needle 150-1 in the target multi-needle module 150 are preset to be completely consistent, thereby ensuring that the printing line width of the target LED retaining wall is consistent.

[0111] The fluid control system 150-2 may be a pneumatic dispenser connected to a control terminal to control the flow rate of the slurry. By presetting perfectly consistent air pressure parameters for each printing needle 150-1 in the target multi-needle module 150, it is ensured that the slurry is extruded until each printing needle 150-1 is discharged stably.

[0112] Preferably, the target multi-needle module 150 in the display panel LED wall printing device includes one or more sub-modules, where each sub-module may include one or more printing needles 150-1 and a fluid control system 150-2, although embodiments of the present invention are not specifically limited thereto.

[0113] Illustratively, the target multi-needle module 150 may include two sub-modules, namely a first module 151 and a second module 152, where multiple printing needles 150-1 in the first module 151 and the second module 152 are arranged horizontally and vertically with preset spacing parameters.

[0114] Illustratively, the target multi-needle module 150 may include one sub-module, i.e., a first module 151 or a second module 152, where the first module 151 (or the second module 152) includes only one printing needle 150-1 or includes multiple printing needles arranged with preset spacing parameters.

[0115] The target workstation 160 is connected to the motion control system 110 and is configured to receive a target substrate such that the target multi-needle module 150 performs layer-by-layer printing of a target LED retaining wall on the top surface of the target substrate.

[0116] Here, the target workstation 160 includes a first workstation 161 and / or a second workstation 162, the target LED retaining wall includes a horizontal LED retaining wall and a vertical LED retaining wall, the first module 151 matches the first workstation 161, and the second module 152 matches the second workstation 162.

[0117] Specifically, the suction cup 122 in the printing device for the LED retaining wall of the display panel is moved to the horizontal platform of the target workstation (i.e., the plane formed by the X-axis and Y-axis), and the target substrate sucked by the suction cup 122 is completely located within the range of the horizontal platform, and the motion control system drives the suction device 120 to drive the target substrate to move along a preset trajectory on the horizontal platform; at the same time, the Z-axis controller 140 drives the target multi-needle module 150 corresponding to the target workstation 160 to print the target LED retaining wall on the upper surface of the target substrate.

[0118] Preferably, the target workstation 160 in the display panel LED retaining wall printing device includes one or more workstations, where each workstation can accommodate a target substrate and use 3D direct-write printing technology to print the target LED retaining wall, although embodiments of the present invention are not specifically limited thereto.

[0119] Illustratively, the target workstation 160 may include two workstations, namely a first workstation 161 and a second workstation 162, where the first workstation 161 may correspond to the first module 151 and the second workstation 162 may correspond to the second module 152.

[0120] In the first workstation 161, after the horizontally arranged needles of the first module 151 are fixed, the upper left corner of the target substrate is used as the initial point, and the motion control system 110 drives the suction device 120 to move vertically along each printing position in the Y axis to the bottom of the target substrate, thereby performing layer-by-layer printing during the reciprocating process to generate a complete vertical LED retaining wall.

[0121] In the second workstation 162, after the vertically arranged needles of the first module 152 are fixed, the upper left corner of the target substrate is used as the initial point, and the motion control system 110 drives the suction device 120 to move horizontally along each printing position in the X-axis to the right side of the target substrate, and performs layer-by-layer printing during the reciprocating process to generate a complete horizontal LED retaining wall.

[0122] Illustratively, the target workstation 160 may include one workstation, namely, the first workstation 161 or the second workstation 162. After fixing the first module 151 (or the second module 152), the upper left corner of the target substrate is used as the initial point, and the suction device 120 is driven by the motion control system 110 to move vertically to the bottom, and performs stacking printing during the reciprocating process to generate a complete vertical LED retaining wall, and then the motion control system 110 drives the first workstation 161 (or the second workstation 162) to rotate 90°, and then the suction device 120 is further driven to perform stacking printing along the same motion trajectory to generate a complete horizontal LED retaining wall.

[0123] Here, the embodiment of the present invention is not specifically limited to the color of the target LED retaining wall.

[0124] Optionally, the target LED retaining wall can be a uniform color to provide consistent reflectance across the wall.

[0125] For example, since white has a high reflectance, by setting the entire target LED retaining wall to white, the white light generated by each LED is not doped with other colors, which can greatly improve the contrast and increase the overall brightness. Even in the case of Mini-LED products and Micro-LED products with small LED gaps, it is possible to generate a retaining wall with a consistent generated spectrum and a uniform wall, which truly improves the precision and efficiency of retaining wall manufacturing, and further greatly improves the overall brightness and contrast.

[0126] Optionally, the target LED retaining wall can be made of a non-uniform color to achieve corresponding reflectance at different locations on the wall.

[0127] For example, in the process of printing the target LED retaining wall, the color of the bottom layer of the retaining wall is set to white, and the color saturation is sequentially increased in the printing process layer by layer to form a wall with a gradient color, thereby improving the luminous efficiency of each LED lamp bead.

[0128] It should be understood that in the manufacturing process of the printing device for the LED retaining wall of the display panel, according to the actual task requirements, a colored coating layer can also be applied to the inner wall or outer wall of the target LED retaining wall to achieve the corresponding effect.

[0129] For example, if the LED cannot emit light normally, a black coating layer can be applied to the top of the retaining wall (the upper outer wall) to make the black color displayed outside uniform. At the same time, if the LED emits light normally, the wall with the same spectrum can still ensure that each LED has a good reflection effect and improves the luminance.

[0130] In the embodiment of the present invention, the target multi-needle module is controlled in the target workstation based on the Z-axis controller, and the motion control system controls the motion process of the target substrate in the XY plane. After the target multi-needle module adjusts the printing receiving distance at each printing position, the direct-write 3D printing technology is used to manufacture the target LED retaining wall with uniform width and high verticality through stacking printing in the target substrate. The manufacturing efficiency and accuracy of the LED retaining wall can be improved. Furthermore, the construction of a retaining wall with uniform height and width around the sub-pixel can prevent light leakage and at the same time enhance the contrast of the LED display, and the gain is more obvious for Mini-LED products and Micro-LED products.

[0131] According to any of the above embodiments, the target workstation 160 further includes a cleaning area configured to clean and store the printing needles.

[0132] Specifically, in the display panel LED retaining wall printing apparatus, after the target workstation 160 completes all printing tasks, the motion control system 110 receives an instruction from the control terminal and drives the cleaning area to move to the position of the target multi-needle module 150, so that each printing needle 150-1 in the target multi-needle module 150 is immersed in the solvent of the cleaning area and preserved by liquid seal at room temperature conditions.

[0133] The pre-print zone is configured to perform pre-printing at preset air pressure parameters such that the motion control system 110 controls the suction device 120 to move away from the pre-print zone until the print needles are steadily ejected.

[0134] Specifically, in the display panel LED retaining wall printing device, after the flatness scanning task is completed by the measurement system 130 at the target workstation 160, the motion control system 110 drives the adsorption device 120 to move to the preliminary printing area, and the control terminal 100 drives the fluid control system 150-2 with the air pressure parameters preset thereto, and the slurry is extruded until each needle of the multi-needle is stably discharged (only the first product after material replacement needs to be extruded to perform preliminary printing), and the control adsorption device 120 transports the target substrate to the initial printing position.

[0135] In the embodiment of the present invention, a preliminary printing area and a cleaning area are set up in the target workstation, and the discharge speed of each printing needle is made consistent by working through the preliminary printing area before printing. After printing, the needle is cleaned and stored through the cleaning area. This can extend the service life of the LED retaining wall when not performing a printing task, and improve the manufacturing stability of the LED retaining wall when performing a printing task.

[0136] Based on any of the above embodiments, the motion control system 110 is specifically configured to control the suction device 120 to move in the XY plane when the target workstation 160 includes a first workstation 161 and a second workstation 162, so that the first module 151 prints a vertical LED retaining wall on the target substrate in the first workstation.

[0137] It should be noted that the application scenario of the display panel LED retaining wall printing device has two operating workstations and two multi-needle modules, and the relative positional relationship for each operating workstation and multi-needle module is pre-set, and horizontal and vertical printing is performed using different multi-needle modules at different operating workstations.

[0138] Specifically, the motion control system 110 drives the suction cup 122 to move to the first workstation 161, and from the initial printing point of the target substrate, the suction cup 122 transports the target substrate and moves in the XY plane according to a preset trajectory route, so that the fixed first module 151 traverses each individual printing position in each row of the target substrate in the first workstation 161, prints layer by layer, and generates multiple complete vertical LED retaining walls.

[0139] It should be understood that after the suction device 120 executes the trajectory route, i.e., after the first module 151 traverses all the printing positions, the motion control system 110 receives corresponding feedback information and knows that the printing of the lateral LED retaining wall is completed.

[0140] By sending a first movement command to the suction device, the suction device transfers and moves the target substrate within the XY plane of the second workstation according to the first movement command, and the second module prints a lateral LED retaining wall on the target substrate at the second workstation.

[0141] Specifically, after the motion control system 110 determines that the printing of the vertical LED retaining wall is completed, the suction device 120 sends a first motion command.

[0142] The first motion command refers to an operation command for the controlled suction device 120 to move the workstation. The first motion command is configured to drive the suction cup 122 in the suction device 120 to transport the target substrate on which the vertical LED retaining wall is generated and move it to the second workstation 162, and drive the suction cup 122 to transport the target substrate and move in the XY plane according to a preset trajectory route by the motion control system 110 from the previous printing end point, so that the fixed second module 152 traverses each printing position in each row of the target substrate in the second workstation 162, prints layer by layer, and generates multiple complete horizontal LED retaining walls.

[0143] In the embodiment of the present invention, the first workstation and the second workstation use a direct-write 3D printing technology through the corresponding first module and second module to manufacture horizontal and vertical LED retaining walls with uniform width and high verticality on the target substrate through lamination printing, thereby improving the manufacturing efficiency and accuracy of the LED retaining walls.

[0144] Based on any of the above embodiments, the motion control system 110 is specifically configured to control the suction device to move in the XY plane when the target workstation includes the first workstation or the second workstation, so that the target multi-needle module prints a vertical LED retaining wall on the target substrate at the target workstation 160.

[0145] It should be noted that the application scenario of the display panel LED retaining wall printing device only has one operating workstation and one multi-needle module, and by rotating the operating workstation, the relative position relationship between the operating workstation and the multi-needle module can be changed to perform horizontal and vertical printing respectively.

[0146] The target workstation may be either the first workstation 161 or the second workstation 162 .

[0147] Correspondingly, a target multi-needle module 150 is correspondingly installed in the workstation, which may be a first module 151 in which the printing needles have a horizontal arrangement rule, or a first module 152 in which the printing needles have a vertical arrangement rule.

[0148] Specifically, the motion control system 110 drives the suction cup 122 to move to the target workstation 160, and from the printing initial point of the target substrate, the suction cup 122 carries the target substrate and moves in the XY plane according to a preset trajectory route, so that the fixed target multi-needle module 150 traverses each printing position in each row of the target substrate in the target workstation 160, prints layer by layer, and generates a complete vertical LED retaining wall. It should be understood that after the target multi-needle module 150 traverses all the printing positions, the motion control system 110 receives corresponding feedback information to know that the printing of the vertical LED retaining wall is completed.

[0149] By sending a second movement command to the target workstation 160, the target workstation 160 rotates 90 degrees according to the second movement command, and then the suction device is driven to move in the XY plane, so that the target multi-needle module 150 prints a lateral LED retaining wall on the target substrate at the target workstation 160.

[0150] Specifically, the motion control system 110 sends a second motion command to the target workstation 160 after determining that printing of the vertical LED retaining wall is complete.

[0151] The second motion command refers to an operation command for controlling the rotation of the target workstation 160. The second motion command is configured such that, after the target workstation 160 rotates 90° in conjunction with the target substrate on which the vertical LED retaining wall is generated, the motion control system 110 drives the suction cup 122 to carry the target substrate and move in the XY plane according to a preset trajectory route from the previous printing end point, so that the fixed target multi-needle module 150 traverses each printing position in each row of the target substrate in the target workstation 160, prints layer by layer, and generates a plurality of complete horizontal LED retaining walls. It should be understood that the vertical LED retaining walls and the horizontal LED retaining walls do not have an absolute printing order, and are determined together with the trajectory route by the target multi-needle module 150 and the suction device 120 carrying the target substrate, that is, it is necessary to ensure that the arrangement direction of the needles of the target multi-needle module 150 is perpendicular to the movement direction of the target substrate moving from the initial printing position.

[0152] In the embodiment of the present invention, the corresponding target multi-needle module in the first or second workstation uses direct-writing 3D printing technology, and the first or second workstation cooperates with the target substrate to perform rotation change in direction, thereby respectively manufacturing horizontal and vertical LED retaining walls with uniform width and high verticality by stack printing, which can improve the manufacturing efficiency and accuracy of the LED retaining walls.

[0153] According to any of the above embodiments, one or more Z-axis controllers 140 are included.

[0154] Specifically, there is a one-to-one corresponding connection relationship between the Z-axis controller 140 and the target multi-needle module 150 in the printing device of the LED retaining wall of the display panel, so that the Z-axis controller 140 controls the corresponding target multi-needle module 150 to move in the Z-axis, thereby adjusting the printing receiving distance.

[0155] The embodiment of the present invention is not specifically limited to the number of Z-axis controllers 140 .

[0156] Optionally, the number of Z-axis controllers 140 may be one. Correspondingly, the target multi-needle module 150 arranges multiple printing needles 151 with small outlet inner diameters at fine intervals, so that when the target multi-needle module 150 is at any printing position, the Z-axis controller controls to adjust the printing receiving distance, and the target multi-needle module 150 with multiple printing needles 151 can print the corresponding wall width.

[0157] Optionally, the number of Z-axis controllers 140 may be multiple. Correspondingly, a target multi-needle module 150 is installed correspondingly connected to each Z-axis controller 140, and each target multi-needle module 150 has a printing needle 151 with a large inner diameter of the outlet, and multiple target multi-needle modules 150 are arranged at large intervals, so that each target multi-needle module 150 is at any corresponding printing position, and the corresponding Z-axis controller controls to adjust the printing receiving distance, so that one target multi-needle module 150 can print a corresponding wall width, and multiple target multi-needle modules 150 can print multiple target LED retaining walls at the same time.

[0158] In the embodiment of the present invention, based on installing one or more Z-axis controllers, the target multi-needle module is controlled to adjust the printing receiving distance at the target workstation, and then a target LED retaining wall with uniform width and high verticality is manufactured on the target substrate by layer printing using direct-write 3D printing technology, which can improve the manufacturing efficiency, precision and flexibility of the LED retaining wall.

[0159] Illustratively, Fig. 2 is a process flow chart 1 of the printing device for the LED retaining wall of the display panel provided by the present invention. Fig. 3 is a process flow chart 2 of the printing method for the LED retaining wall of the display panel provided by the present invention. As shown in Fig. 2 and Fig. 3, a specific embodiment of the printing process flow of the target LED retaining wall is shown.

[0160] 1. Loading and preparation of the machine:

[0161] (1) After filling the syringe with printing material, attach it to an air-operated dispenser.

[0162] (2) Loading area: The substrate is automatically loaded, the automation software is started, the vacuum pump turns on the suction cup to automatically suck the substrate, the ceramic suction cup is automatically transferred to the workstation 1, and automatic mechanical reset and leveling adjustment are realized.

[0163] (3) A high-precision height measurement device is used to rapidly scan the entire substrate and record the flatness data of the substrate.

[0164] (4) In the pre-printing area, the pneumatic dispenser is automatically started, and the automation software controls the flow rate, and the slurry is extruded until each needle of the multi-needle is stably discharged (only the first product after the material change needs to be extruded to perform pre-printing), and then the multi-needle starts moving to the initial printing position.

[0165] Second, sample printing:

[0166] (5) After the multi-needle modules of the horizontal and vertical retaining walls move to the initial printing position, according to the control terminal vision algorithm, automatically adjust the distance between the needle and the substrate to the height of the retaining wall, and call up the substrate flatness data through the software to adjust the printing height to ensure that the distance between the needle and the substrate is consistent during the printing process.

[0167] (6) The gas valve parameters connecting the multi-needle modules of the vertical retaining wall and the horizontal retaining wall are adjusted to be completely consistent, thereby ensuring that the printing line widths of the vertical retaining wall and the horizontal retaining wall are consistent.

[0168] (7) The ceramic suction cup is automatically transferred to the workstation 1 and moves to complete the printing of the lateral retaining wall.

[0169] (8) The ceramic suction cup is automatically transferred to workstation 2 and moves to complete the printing of the vertical retaining wall.

[0170] (9) Repeat steps (6) to (8) to perform layer printing until the retaining wall of the target height is printed.

[0171] (10) Turn off the vacuum pump, remove the substrate, and manually move the substrate to a heated drying box to dry. When the retaining wall is completely cured, the printing of the integrated substrate retaining wall is completed.

[0172] (11) The ceramic suction cup mounting platform is automatically transferred to workstation 1, and steps (2) to (8) are repeated to print subsequent samples.

[0173] 4 is a flow chart of the printing method for the LED retaining wall of the display panel provided by the present invention. Based on the content of any embodiment above, as shown in FIG. 4, the printing method for the LED retaining wall of the display panel includes the following steps: for a printing task, perform a pre-printing preparatory operation, scan the target substrate by the measurement system of the printing device for the LED retaining wall of the display panel, and obtain flatness data of the target substrate;

[0174] Here, the printing task includes at least determining a target line width and a target height according to a target substrate.

[0175] It should be noted that the implementation body of the method for printing an LED wall of a display panel provided by the embodiment of the present invention is a printing device for printing an LED wall of a display panel.

[0176] The application scenario of the printing method of the LED retaining wall of the display panel provided by the embodiment of the present invention is determined by the printing task of the target substrate, where the printing task includes but is not limited to: determining the printing object as the target substrate; and determining the target line width and target height of the retaining wall according to the size of each LED light-emitting component in the LED light-emitting matrix in the target substrate.

[0177] Specifically, in step 401, the operator loads and pre-operates the machine in the display panel LED retaining wall printing device for the printing task, and after preparation is completed, the measurement system of the LED retaining wall printing device quickly scans the entire target substrate and records the flatness data of the target substrate.

[0178] The flatness data refers to the measured vertical distance from the measurement system sensor to each printed location as the measurement system traverses that location on the target substrate.

[0179] Step 402, the motion control system moves the target multi-needle module to an initial printing position on the target substrate, and adjusts the printing receiving distance of the multi-needle module by the Z-axis controller based on the received flatness data.

[0180] It should be noted that the initial printing position refers to the first printing position on the target substrate. The initial printing position is configured to print the dot and form the LED retaining wall. The position of the initial printing position and the target substrate have a relative positional relationship, and the initial printing position may be located at the upper left corner, upper right corner, lower left corner, lower right corner, etc. of the target substrate, and the embodiment of the present invention is not specifically limited thereto.

[0181] It should be understood that the initial print position can determine the trajectory route that the suction device carrier carries the target substrate and moves in the XY plane at the target workstation.

[0182] Specifically, in step 402, the motion control system in the display panel LED retaining wall printing device moves the multi-needle module to the initial printing position of the target substrate, and then generates an adjustment policy according to the control terminal vision algorithm based on the flatness data obtained from step 401, and drives the Z-axis controller to adjust the printing receiving distance between the target multi-needle module and the target substrate based on the adjustment policy.

[0183] The print receiving distance refers to the vertical distance between the target multi-needle module and each print location in the target substrate as the target multi-needle module traverses the print location. The embodiment of the present invention is not specifically limited to the print receiving distance.

[0184] Illustratively, if there is only one printing needle in the target multi-needle module, the print reception distance is the vertical distance between that printing needle at any printing position and that printing position.

[0185] For example, if a target multi-needle module has N printing needles arranged horizontally or vertically, and the N printing positions corresponding to each needle form a printing position matrix, the printing receiving distance is the vertical distance between the target multi-needle module and the printing position matrix, where N is a positive integer.

[0186] Step 403: Based on the preset air pressure parameters and the target line width, the target multi-needle module performs lamination printing on the upper surface of the target substrate in the target workstation, and curing and generating the target LED retaining wall, provided that the printing height is within the target height range.

[0187] Here, the target workstation includes a first workstation and / or a second workstation, the target LED retaining wall includes a horizontal LED retaining wall and a vertical LED retaining wall, the target multi-needle module includes a first module and / or a second module, and the printing height is a cumulative layer height corresponding to the number of printed layers.

[0188] It should be noted that the parameters set before step 403 include, but are not limited to, pre-set air pressure parameters and target line width.

[0189] The air pressure parameter is configured to drive controlling the exhaust of a fluid control system within the printing apparatus of the LED retaining wall of the display panel. The air pressure parameter may measure the pressure of the gas in megapascals (MPa) or pounds per square inch (psi). The present invention is not specifically limited thereto.

[0190] The target line width corresponds to the inner diameter parameter of the printing needle, and printing needles of different inner diameters can print retaining walls of different line widths. Embodiments of the present invention are not specifically limited to the range of values ​​for each parameter.

[0191] The value range of the inner diameter parameter of the printing needle may be 20 μm to 70 μm. Since the inner diameter of the printing needle has a large effect on the printed target line width, the embodiment of the present invention is not specifically limited to the value of the inner diameter parameter of the printing needle.

[0192] Preferably, the value range of the inner diameter parameter of the printing needle is 45 μm to 60 μm.

[0193] The value of the target line width may range from 10 μm to 100 μm. Because different display panels have different sub-pixel spacings, the embodiments of the present invention are not specifically limited to the value of the target line width.

[0194] Preferably, the target line width has a value in the range of 50 μm to 80 μm.

[0195] You can also pre-set the following:

[0196] The speed of movement of the suction device is configured to drive the movement of the suction device within the printing device of the LED retaining wall of the display panel.

[0197] The target height range refers to a limiting condition of the printing height. The target height range may be a range section defined by the target height, or the target height range may be a range section formed by the target height and its allowable tolerance range. The value range of the retaining wall height may be 10 μm to 200 μm. Because different display panels have different manufacturing processes and different thicknesses, the embodiment of the present invention is not specifically limited to the value of the target height.

[0198] Preferably, the target height value ranges from 150 μm to 200 μm.

[0199] Specifically, in step 403, the air pressure parameters, the moving speed of the printing needle and the target line width are preset for the printing device of the LED retaining wall of the display panel, and the printing needle of the target multi-needle module is driven to move from the initial printing position on the target substrate to the last printing position in the row or column where the dot is located, thereby generating a first printing layer with the corresponding line width and layer height. By analogy, after multiple printing layers are stacked, a curing operation is performed to form the target LED retaining wall.

[0200] The target LED wall includes a horizontal LED wall and a vertical LED wall, both of which have different sizes. Here, the width of the target LED wall is the target line width, and the height of the target LED wall is the printing height, i.e., the product of the number of printing layers and the layer height. The length of the target LED wall is the product of the moving speed and the moving time of the printing needle.

[0201] Preferably, the printing device of the LED wall of the display panel drives the printing needle to generate a first printing layer with a corresponding line width and layer height according to the preset air pressure parameters, the movement speed of the printing needle and the target line width; after a plurality of printing layers are stacked, the measuring system further quickly scans to obtain the actual value of the printing height, and compares it with the target height range set for the printing task, and the comparison result is divided into comparison success and comparison failure, where:

[0202] If the comparison is successful, it indicates that the actual value of the printing height formed by the laminate printing is within the range of the target height, i.e., the difference between the two is equal to or close to 0, and the target substrate can be removed and moved to a heated drying box to dry. When the retaining wall is completely hardened, the printing of the target LED retaining wall on the target substrate is completed.

[0203] If the comparison fails, it indicates that the actual value of the printing height formed by the laminate printing is outside the range of the target height, i.e., the difference between the two exceeds the allowable tolerance range, and the target substrate needs to be further processed until it meets the rejection criteria according to the actual failure situation.

[0204] 4 is a diagram showing the effect of the LED retaining wall of the display panel provided by the present invention. As shown in FIG. 4, the embodiment of the present invention shows a schematic diagram of the shape of the target LED retaining wall that is cured and formed after removing the target substrate.

[0205] It should be understood that the material can be cured by infrared curing, and the effect of drying in a high-temperature drying box for an hour can be achieved in a few minutes, improving the curing efficiency. In addition, the infrared curing device has a small volume, which is easy to integrate into the printing device and allows for high integration of the device.

[0206] In addition to these, the printing material can also be selected, where the printing material is generally not conductive and can be materials such as silicone, epoxy resin, etc.

[0207] In the embodiment of the present invention, the target multi-needle module is controlled in the target workstation based on the Z-axis controller, and the motion control system controls the motion process of the target substrate in the XY plane. After the target multi-needle module adjusts the printing receiving distance at each printing position, the direct-write 3D printing technology is used to manufacture the target LED retaining wall with uniform width and high verticality through stacking printing in the target substrate. The manufacturing efficiency and accuracy of the LED retaining wall can be improved. Furthermore, the construction of a retaining wall with uniform height and width around the sub-pixel can prevent light leakage and at the same time enhance the contrast of the LED display, and the gain is more obvious for Mini-LED products and Micro-LED products.

[0208] Based on any of the above embodiments, adjusting the printing reception distance of the multi-needle module based on the received flatness data includes obtaining the vertical distance between each printing position on the target substrate and the target multi-needle module as the actual value of the printing reception distance based on the flatness data and the target correspondence relationship.

[0209] It should be noted that target correspondence refers to the relative positional relationship between the sensor and the target multi-needle module in the measurement system.

[0210] Specifically, the printing device of the LED retaining wall of the display panel calls up the flatness data of the substrate, and uses the target correspondence relationship to convert the distance between the sensor and the corresponding printing position into the vertical distance between the target multi-needle module and the corresponding printing position, which is the actual value of the printing receiving distance.

[0211] When the target multi-needle module is located at the printing position, the Z-axis controller adjusts the actual value of the printing receiving distance to the target value of the printing receiving distance.

[0212] Here, the target value of the print receiving distance corresponding to each print position is the same.

[0213] It should be noted that the target value of the print receiving distance needs to be preset. For example, the target value of the print receiving distance may be set when specifying a print task.

[0214] Specifically, in the process of actually executing a printing task, the printing device of the LED retaining wall of the display panel has an adsorption device transport the printing position on the target substrate to align it with the target multi-needle module, and then the Z-axis controller drives the target multi-needle module to the printing position (i.e., fixed X-axis coordinate and Y-axis coordinate), and adjusts the actual value of the printing receiving distance along the Z-axis to the target value, so that after the adjustment, each needle prints at the corresponding printing position with the same printing receiving distance.

[0215] In the embodiment of the present invention, the Z-axis controller controls the target multi-needle module to the target workstation, so that each printing position achieves the same print receiving distance for direct-write 3D printing, which can eliminate the error caused by the unevenness of the target substrate, and further improve the manufacturing efficiency and accuracy of the LED retaining wall.

[0216] Based on any of the above embodiments, performing a pre-printing operation includes loading the printing material into a syringe, attaching a printing needle to the syringe, and connecting the syringe to a fluid control system via the printing needle.

[0217] Here, the printing material matches the width-height ratio formed by the printing material, the inner diameter parameter of the printing needle matches the target line width, and the number of printing layers is set based on the width-height ratio of the target LED retaining wall, the target line width and the target height.

[0218] It should be explained that the target line width of the printed LED retaining wall is jointly determined by the material properties of the printing material, the pressure applied by the fluid control system, and the inner diameter parameters of the printing needle.

[0219] The printing material refers to a fluid material having a certain viscosity that can be hardened after processing. The viscosity value of the printing material may range from 400,000 cp to 800,000 cp. Because of different needs of printing tasks, the embodiment of the present invention is not specifically limited to the viscosity of the printing material.

[0220] Preferably, the viscosity range of the printing material may be 500,000 cp to 600,000 cp.

[0221] Specifically, in step 401, for a target line width in a printing task, based on the correspondence between the viscosity of the printing material and the width-height ratio printed by the printing needle, an appropriate printing material is selected and filled into a syringe, the printing needle is attached to the lower end of the syringe, the printing needle is directed downward, and the fluid control system controls the printing material to flow out of the printing needle, forming a printing layer having a line width whose size corresponds to the inner diameter parameter and a layer height derived by the width-height ratio.

[0222] It should be understood that before actually performing the printing task, the layer height derived by the line width and the width-to-height ratio, the number of printing layers can also be obtained, except for the target height. Furthermore, in the process of actually performing the printing task, after completing printing with the specified number of printing layers, the printing height formed by stacking is compared with the target height to determine whether the printing task is completed.

[0223] It should be understood that the color of the retaining wall can be a solid color or a gradient color, so the printing material needs to be adjusted to the corresponding color.

[0224] Illustratively, the color of the printing material can be tuned to white, loaded into a syringe, and printed layer by layer to produce a spectrally matched white retaining wall.

[0225] For example, when printing the first layer, the color of the printing material is adjusted to white and printed, then it is moved to a cleaning area to wash away any remaining material in the syringe, and then a printing material with increasing color saturation is injected to print the second layer, thereby generating a retaining wall with a gradient color that matches the spectrum.

[0226] A mechanical reset operation is performed by controlling the motion control system through a control terminal.

[0227] Specifically, before executing each printing task, the display panel LED retaining wall printing device launches automation software on the control terminal, which drives the motion control system to perform automatic mechanical reset and leveling adjustment for the mechanical device.

[0228] The embodiment of the present invention selects appropriate printing materials and performs mechanical reset before printing, selects materials according to different printing needs, matches the execution conditions of different printing tasks, and further improves the manufacturing efficiency and accuracy of the LED retaining wall.

[0229] Based on any of the above embodiments, before the motion control system moves the target multi-needle module to the initial printing position on the target substrate, pre-printing is performed under preset air pressure parameters, and the motion control system controls the suction device to move away from the pre-printing area until the printing needles are stably discharged.

[0230] Specifically, before actually executing a printing task, the printing device for the LED retaining wall of the display panel drives the fluid control system with preset air pressure parameters in the preliminary printing area to control the flow rate of the printing material, and the slurry is extruded until each needle is stably discharged (only the first product after the material change needs to be extruded to perform preliminary printing), and the motion control system drives the suction device to move the target substrate to the initial printing position.

[0231] The embodiment of the present invention matches the ejection speed of each printing needle based on the work in the pre-printing area, which can improve the manufacturing stability of the LED retaining wall when performing the printing task.

[0232] Based on any of the above embodiments, performing layer-by-layer printing on the upper surface of the target substrate at the target workstation by the target multi-needle module based on preset air pressure parameters and target line width, and generating a target LED retaining wall when the printing height meets the target height, includes: performing layer-by-layer printing on the upper surface of the target substrate at the first workstation by the first module based on preset air pressure parameters and target line width, and generating a lateral LED retaining wall, provided that the printing height is within the target height range.

[0233] It should be noted that the application scenario of the display panel LED retaining wall printing device has two operating workstations and two multi-needle modules, and the relative positional relationship for each operating workstation and multi-needle module is pre-set, and horizontal and vertical printing is performed using different multi-needle modules at different operating workstations.

[0234] Specifically, in step 403, the suction cup conveys the target substrate to the first workstation, and from the printing initial point of the target substrate, the control terminal controls the motion control system to drive the suction cup to convey the target substrate to move in the XY plane along a preset trajectory route at a certain speed. At the same time, an appropriate first module is installed according to the preset target line width, and the control terminal controls the fluid control system to set the preset air pressure parameters, so that the first module traverses each printing position in each row of the target substrate in the first workstation, and prints layer by layer after adjusting the printing receiving distance along the Z axis at the printing position, thereby generating a plurality of complete vertical LED retaining walls. It should be understood that after the first module traverses all the printing positions, the motion control system receives the corresponding feedback information to know that the printing of the horizontal LED retaining walls is completed. In addition, by sending a first motion command to the suction device, the suction device transfers the target substrate to the second workstation according to the first motion command, and the second module prints the horizontal LED retaining walls.

[0235] Based on the preset air pressure parameters and the target line width, the second module performs layer printing on the upper surface of the target substrate in the second workstation to generate a lateral LED retaining wall, provided that the printing height is within the target height range.

[0236] Specifically, the suction cup in the suction device transports the target substrate on which the vertical LED retaining wall is generated and transfers it to the second work station, and from the previous printing end point of the target substrate, the control terminal controls the motion control system to drive the suction cup to transport the target substrate and move in the XY plane along the preset trajectory route at a certain speed. At the same time, an appropriate second module is installed according to the preset target line width, and the control terminal controls the fluid control system to set the preset air pressure parameters, and the second module traverses each printing position in each row of the target substrate in the second work station, and prints layer by layer after adjusting the printing receiving distance along the Z axis at the printing position, thereby generating a plurality of complete horizontal LED retaining walls. It should be understood that the vertical LED retaining wall and the horizontal LED retaining wall do not have an absolute printing sequence, and are determined together with the trajectory route by the target multi-needle module and the suction device transporting the target substrate, that is, it is necessary to ensure that the arrangement direction of the needles of the target multi-needle module is perpendicular to the movement direction of the target substrate from the initial printing position.

[0237] In the embodiment of the present invention, the first workstation and the second workstation use a direct-write 3D printing technology through the corresponding first module and second module to manufacture horizontal and vertical LED retaining walls with uniform width and high verticality on the target substrate through lamination printing, thereby improving the manufacturing efficiency and accuracy of the LED retaining walls.

[0238] Based on any of the above embodiments, performing layer printing on the upper surface of the target substrate at the target workstation by the target multi-needle module based on preset air pressure parameters and target line width, and generating a target LED retaining wall under the condition that the printing height is within the target height range, includes performing layer printing on the upper surface of the target substrate at the first workstation or the second workstation based on preset air pressure parameters and target line width, and generating a vertical LED retaining wall if the printing height meets the target height.

[0239] It should be noted that the application scenario of the display panel LED retaining wall printing device only has one operating workstation and one multi-needle module, and by rotating the operating workstation, the relative position relationship between the operating workstation and the multi-needle module can be changed to perform horizontal and vertical printing respectively.

[0240] The target workstation may be either the first workstation or the second workstation.

[0241] Correspondingly, a target multi-needle module is correspondingly installed in the workstation, which may be a first module in which the printing needles have a horizontal arrangement rule, or a first module in which the printing needles have a vertical arrangement rule.

[0242] Specifically, the suction cup is transferred to the target work station, and from the printing initial point of the target substrate, the control terminal controls the motion control system to drive the suction cup to carry the target substrate and move in the XY plane along the preset trajectory route at a certain speed. At the same time, a suitable target multi-needle module is set according to the preset target line width, and the control terminal controls the fluid control system to set the preset air pressure parameters, so that the target multi-needle module traverses each printing position in each row of the target substrate in the target work station, and prints layer by layer after adjusting the printing receiving distance along the Z axis at the printing position, thereby generating a plurality of complete vertical LED retaining walls. It should be understood that after the target multi-needle module traverses all the printing positions, the motion control system receives the corresponding feedback information to know that the printing of the horizontal LED retaining walls is completed. In addition, by sending a second motion command to the target work station, the target work station rotates 90° according to the second motion command, and then the target multi-needle module prints the horizontal LED retaining walls.

[0243] The first or second workstation is rotated 90°, and the target multi-needle module performs layer printing on the top surface of the target substrate, generating a vertical LED retaining wall when the printing height meets the target height.

[0244] Specifically, after the target work station rotates 90° in cooperation with the target substrate that generates the lateral LED retaining wall, from the previous printing end point of the target substrate, the control terminal controls the motion control system to drive the suction cup to convey the target substrate and move in the XY plane along the preset trajectory route at a certain speed. At the same time, the control terminal controls the fluid control system to set the preset air pressure parameters by setting an appropriate target multi-needle module according to the preset target line width, so that the target multi-needle module traverses each printing position in each row of the target substrate in the target work station, adjusts the printing receiving distance along the Z axis at the printing position, and then prints layer by layer to generate multiple complete lateral LED retaining walls.

[0245] 5 is a retaining wall effect diagram of the LED retaining wall printing method of the display panel provided by the present invention. Illustratively, as shown in FIG. 5, after carrying out the corresponding process flow by the above LED retaining wall printing method, a spectrum-matched retaining wall can be established around three single LEDs in each LED of the substrate.

[0246] In the embodiment of the present invention, the corresponding target multi-needle module in the first or second workstation uses direct-writing 3D printing technology, and the first or second workstation cooperates with the target substrate to perform rotation change in direction, thereby respectively manufacturing horizontal and vertical LED retaining walls with uniform width and high verticality by stack printing, which can improve the manufacturing efficiency and accuracy of the LED retaining walls.

[0247] Fig. 6 shows an actual configuration diagram of the electronic device. As shown in Fig. 6, the electronic device may include a processor 610, a communications interface 620, a memory 630, and a communications bus 640. Here, the processor 610, the communications interface 620, and the memory 630 communicate with each other via the communications bus 640. The processor 610 can call logic instructions in the memory 630 to execute the printing method of the LED retaining wall of the display panel. The method includes: for a printing task, performing a pre-printing preparatory operation, scanning the target substrate by a measurement system of the printing device of the LED retaining wall of the display panel, and obtaining flatness data of the target substrate; a motion control system moving the target multi-needle module to an initial printing position of the target substrate, and adjusting the printing receiving distance of each printing needle in the target multi-needle module by the Z-axis controller based on the received flatness data; and, based on a preset air pressure parameter, a preset printing needle motion speed and a target line width, performing layered printing on the upper surface of the target substrate at the target workstation by the target multi-needle module, and curing and generating the target LED retaining wall, under the condition that the printing height is within the target height range, where the target workstation includes a first workstation and / or a second workstation, the target LED retaining wall includes a horizontal LED retaining wall and a vertical LED retaining wall, the target multi-needle module includes a first module and / or a second module, the printing height is a cumulative layer height corresponding to the number of printing layers, and the printing task includes determining the target line width and the target height according to at least the target substrate.

[0248] Moreover, the logic instructions in the memory 630 can be realized in the form of a software functional unit, and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on this understanding, the technical solution of the present invention can be essentially or a part of the contribution to the prior art or a part of the technical solution can be embodied in the form of a software product, and the computer software product includes a plurality of instructions stored in a storage medium, which causes a computer device (which may be a personal computer, a server, a network device, etc.) to execute all or part of the steps of the method according to each embodiment of the present invention. The aforementioned storage medium includes various media that can store program codes, such as U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.

[0249] According to another aspect, the present invention further includes a computer program product including a computer program stored in a non-transitory computer-readable storage medium, and when the computer program is executed by a processor, the computer can execute the printing method for the LED retaining wall of a display panel provided by each of the above methods, the method including: for a printing task, performing a pre-printing preparatory operation, scanning a target substrate by a measurement system of the printing device for the LED retaining wall of a display panel to obtain flatness data of the target substrate; a motion control system moving a target multi-needle module to an initial printing position of the target substrate; and adjusting a printing receiving distance of each printing needle in the target multi-needle module by a Z-axis controller according to the received flatness data; , performing layered printing on the upper surface of the target substrate at the target workstation by the target multi-needle module based on the preset air pressure parameters, the preset printing needle movement speed and the target line width, and curing and generating a target LED retaining wall, provided that the printing height is within the target height range, where the target workstation includes a first workstation and / or a second workstation, the target LED retaining wall includes a horizontal LED retaining wall and a vertical LED retaining wall, the target multi-needle module includes a first module and / or a second module, the printing height is a cumulative layer height corresponding to the number of printing layers, and the printing task includes determining the target line width and the target height according to at least the target substrate.

[0250] According to a further aspect, the present invention further provides a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, executes and implements the printing method for an LED retaining wall of a display panel provided by each of the above methods. The method includes: for a printing task, performing a pre-printing preparatory operation, scanning the target substrate by a measurement system of the printing device of the LED retaining wall of the display panel, and obtaining flatness data of the target substrate; a motion control system moving the target multi-needle module to an initial printing position of the target substrate, and adjusting the printing receiving distance of each printing needle in the target multi-needle module by the Z-axis controller based on the received flatness data; and, based on a preset air pressure parameter, a preset printing needle motion speed and a target line width, performing layered printing on the upper surface of the target substrate at the target workstation by the target multi-needle module, and curing and generating the target LED retaining wall, under the condition that the printing height is within the target height range, where the target workstation includes a first workstation and / or a second workstation, the target LED retaining wall includes a horizontal LED retaining wall and a vertical LED retaining wall, the target multi-needle module includes a first module and / or a second module, the printing height is a cumulative layer height corresponding to the number of printing layers, and the printing task includes determining the target line width and the target height according to at least the target substrate.

[0251] As shown in FIG. 7-17, the printing device for LED sealed retaining wall includes a processing table 1 and a three-axis motion module 2 installed on the processing table 1, and a corresponding print head module 4 is connected to the three-axis motion module 2. The three-axis motion module 2 includes a horizontal motion module 2-1 connected to the processing table 1 and a lifting motion module 2-2 installed across the processing table 1. The print head module 4 is located on the lifting motion module 2-2, and a mounting module 3 corresponding to the print head module 4 is provided on the horizontal motion module 2-1. The mounting module 3 includes a base 3-1, a three-axis rotating table 3-2 and a vacuum suction cup 3-3 installed from bottom to top, a suction groove 3-4 is formed on the surface of the vacuum suction cup 3-3, a plurality of protrusions 3-5 are formed in the suction groove 3-4, and a plurality of positioning pins 3-6 are provided at the corners of the vacuum suction cup 3-3, and the plurality of positioning pins 3-6 are located on two adjacent sides of the vacuum suction cup 3-3. The processing table 1 is provided with a visual and measuring device 5 corresponding to the mounting module 3.

[0252] The horizontal motion module 2-1 includes an X-axis moving device attached to the connected processing table 1 and a Y-axis moving device attached to the X-axis moving device, and the X-axis moving device and the Y-axis moving device are installed vertically, and both the X-axis moving device and the Y-axis moving device are driven by linear motors, and the lifting motion module 2-2 is driven by a servo motor.

[0253] The gantry 1-1 is provided with a bottom plate 1-2, the visual and measuring device 5, the print head module 4 and the lifting motion module 2-2 are all installed on the bottom plate 1-2, and the bottom plate 1-2 is formed with fitting holes corresponding to the visual and measuring device 5, the print head module 4 and the lifting motion module 2-2, and the positions of the fitting holes are set according to actual needs.

[0254] The processing table 1 is formed with a gantry 1-1, the lifting motion module 2-2 is mounted on the gantry 1-1, and the print head module 4 and the vision and measuring device 5 are both mounted on the gantry 1-1.

[0255] A plurality of air intake holes 3-7 are formed in the suction groove 3-4, and the air intake holes 3-7 are formed symmetrically along the center of the suction groove 3-4. A vacuum pressure regulating valve communicating with the air intake holes 3-7 is attached to the bottom of the vacuum suction cup 3-3. A pneumatic connector communicating with the vacuum pressure regulating valve is attached to the bottom of the vacuum suction cup 3-3 to obtain a stable and adjustable vacuum pressure, thereby ensuring that the printed circuit board is stably adsorbed to the mounting module 3.

[0256] At least two positioning pins 3-6 are provided on each side of adjacent sides of the vacuum suction cup 3-3, the vacuum suction cup 3-3 has a rectangular structure, the suction groove 3-4 also has a rectangular structure corresponding to the vacuum suction cup 3-3, the vacuum suction cup 3-3 corresponds to the center of the suction groove 3-4, and the positioning pins 3-6 are installed on two adjacent sides of the suction groove 3-4. Under the action of the positioning pins 3-6, the printed circuit board is moved to the suction groove 3-4. After being moved to a predetermined position, the two sides of the printed circuit board abut against the positioning pins 3-6 at the same time, thereby realizing the positioning of the printed circuit board.

[0257] The protrusions 3-5 are offset from the components on the printed circuit board, and are configured to support the printed circuit board, and by arranging as many protrusions 3-5 as possible in the positions of the printed circuit board where there are no components, the protrusions 3-5 can better support the printed circuit board. During the suction process of the vacuum suction cup 3-3, negative pressure is generated between the vacuum suction cup 3-3 and the printed circuit board, which prevents the printed circuit board from being excessively deformed due to pressure under the action of the protrusions 3-5.

[0258] In the actual use process, a raised protrusion 3-5 configured to support the printed circuit board is provided within the suction area of ​​the vacuum suction cup 3-3. Since a large number of components are attached to the back side of the printed circuit board, the shape of the protrusion 3-5 is designed according to the shape of the printed circuit board. The position of the protrusion 3-5 corresponds to a position on the printed circuit board that is flat, free of components, and accessible. In terms of design, as many protrusions as possible are provided in positions without components to obtain good support and ensure suction flatness.

[0259] The three-axis rotating table 3-2 is a standard part, has a three-axis manual rotation function, and is configured to level the vacuum suction cup 3-3. The vacuum suction cup 3-3 is made of aluminum alloy material, with a finely ground surface and high flatness, which improves the leveling effect of the PCB.

[0260] The print head module 4 includes a material extrusion device 4-1, a needle clamp 4-2, a printing needle 4-3 and a printing base 4-4, the needle clamp 4-2 is fixedly connected to the lifting motion module 2-2, the printing base 4-4 is connected to the lifting motion module 2-2, the upper part of the needle clamp 4-2 is connected to the material extrusion device 4-1, and the lower part of the needle clamp 4-2 is connected to the printing needle 4-3.

[0261] The material extrusion device 4-1 is configured to control the extrusion of the printing material, the material extrusion device 4-1 is driven by compressed air, and the material extrusion pressure is controlled by controlling the compressed air air pressure, and the compressed gas air pressure is controlled by a precision air pressure controller, the outlet of the material extrusion device 4-1 is a Luer connector male connector, and the material extrusion device 4-1 is fixed to the needle clamp 4-2 by a hug hoop.

[0262] The needle clamp 4-2 includes a lug hoop bracket 4-2-1 and a connector 4-2-2 connected together, the lug hoop bracket 4-2-1 and the connector 4-2-2 are respectively used to fix the connecting material extrusion device 4-1 and the printing needle 4-3, the connector 4-2-2 is connected to the bottom of the lug hoop bracket 4-2-1, and a lug hoop 4-2-3 that fits the material extrusion device 4-1 is formed on the top of the lug hoop bracket 4-2-1, the size of the lug hoop 4-2-3 corresponds to the size of the material extrusion device 4-1, and the material extrusion device 4-1 is clamped under the action of the lug hoop 4-2-3.

[0263] The upper part of the connector 4-2-2 is set as a Luer female connector, which is connected to the outlet of the material extrusion device 4-1, and the lower part of the connector 4-2-2 is a Luer male connector, which is connected to the printing needle 4-3.

[0264] The printing needle 4-3 includes a connected needle base 4-3-1 and a ceramic needle tip 4-3-2, the needle base 4-3-1 and the ceramic needle tip 4-3-2 are bonded by epoxy resin and can withstand pressures of less than 1000 psi, the upper part of the needle base 4-3-1 is set as a corresponding Luer female connector, the printing needle 4-3 and the needle clamp 4-2 are connected by a Luer connector, the inside of the Luer connector is fixed by a screw and sealed by a cone surface, so that the printing needle 4-3 is stably connected to the needle clamp 4-2, the lower half of the needle base 4-3-1 is bonded by epoxy resin with the ceramic needle tip 4-3-2, the ceramic needle tip 4-3-2 is obtained by a ceramic precision casting and grinding process, and its hole diameter may be 10 to 200 microns to suit the printing needs of retaining walls of various widths.

[0265] The vision and measurement device 5 includes an inclined observation assembly 5-1 and a sensing and measurement assembly 5-2, the sensing and measurement assembly 5-2 is vertically connected to the gantry 1-1, the inclined observation assembly 5-1 is installed at an angle to the side of the print head module 4, and the inclined observation assembly 5-1 is installed toward the printing needle 4-3.

[0266] The oblique observation assembly 5-1 is attached to the side of the print head module 4, and includes a high-magnification camera assembly for observation, which is divided into a camera, a lens barrel, and an objective lens. The camera assembly is attached to a camera clamp, which is equipped with a three-axis manual adjustment device. The oblique observation assembly 5-1 includes an annular light source and a backlight light source for illumination, and the annular light source is attached to the objective lens via a hug hoop, and the backlight light source is attached below the print head module 4.

[0267] At the same time, the hug hoop of the oblique observation assembly 5-1 is connected to the print head module 4 by a three-axis manual adjustment device, and after the print head module 4 is raised or lowered to a certain height, the three-axis manual adjustment device is adjusted to adjust the oblique observation assembly 5-1 so that the oblique observation assembly 5-1 corresponds to the ceramic needle tip 4-3-2, and the oblique observation assembly 5-1 is equipped with a corresponding high-magnification camera assembly to magnify the ceramic needle tip 4-3-2, so that the operator can directly observe the printing status of the ceramic needle tip 4-3-2.

[0268] The sensing and measuring assembly 5-2 is mounted on the bottom plate 1-2, and is located on one side of the inclined observation assembly 5-1, and the sensing and measuring assembly 5-2 includes a high-magnification camera assembly for aligning vision, a laser distance measuring sensor for measuring height, and a large-field-of-view camera assembly for observing printing effects. The high-magnification camera assembly includes a camera, a lens barrel with coaxial light, and an objective lens, and the high-magnification camera assembly is mounted on the bottom plate 1-2 via a manual slide table, the laser distance measuring sensor is mounted on the high-magnification camera assembly via a manual slide table, and the large-field-of-view camera assembly is mounted on the laser distance measuring sensor via a manual slide table.

[0269] The processing table 1 is further provided with a corresponding cleaning device 6 and a contact height measuring device 7. The cleaning device 6 is driven by compressed air, and the inside of the cleaning device 6 blows out compressed air from an annular slit, so that an annular high-speed airflow can be obtained. The execution process of the cleaning device 6 is as follows: the operator inserts the tip of the needle into the hole at the top of the cleaning device 6, turns on the compressed gas source, and under the action of the high-speed airflow, the material remaining on the outer wall of the needle is removed, and the needle is raised at a certain speed so that the high-speed airflow can be evenly blown onto the outer wall of the needle.

[0270] The contact type height measuring device 7 is provided with a contact sensor, an angle adjustment mechanism, and a lift adjustment mechanism.

[0271] The lifting adjustment mechanism is a cross guide rail Z-axis horizontal lifting displacement slide table, made of high-strength aluminum alloy, black anodized, and then assembled with high-precision cross roller guide rail, suitable for frequent adjustment from light to heavy loads, it is a linear table with excellent performance, the angle adjustment mechanism 7-6 can use OMO-VM series cylindrical V-type adjustment frame, has two M6x0.25 fine accelerators, can realize ±3°precise adjustment, and the design of the fine accelerator is equipped with a flexible tightening mechanism to provide long-term reliability.

[0272] Under the action of the angle adjustment mechanism and the lift adjustment mechanism, the contact sensor is leveled, the measurement processing surface of the laser distance measuring sensor is brought into contact with the contact height measuring device 7 to obtain the height relationship between the processing surface and the contact height measuring device 7, the ceramic needle tip 4-3-2 of the print head module 4 is brought into contact with the contact height measuring device 7 to obtain the height relationship between the ceramic needle tip 4-3-2 and the contact height measuring device 7, and the height relationship between the ceramic needle tip 4-3-2 and the processing surface is further calculated and obtained. By adjusting the descent amount of the print head module 4 to control the distance between the ceramic needle tip 4-3-2 of the print head module 4 and the processing surface, the printing height of the print head module 4 can be easily adjusted.

[0273] The above description of the disclosed embodiments enables one skilled in the art to realize or use the present invention. Since various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention, the present invention is not limited to these embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0274] In this specification, many terms such as the symbols in the drawings, i.e., processing table 1, gantry 1-1, three-axis motion module 2, horizontal motion module 2-1, lifting motion module 2-2, placement module 3, base 3-1, three-axis rotating table 3-2, vacuum suction cup 3-3, suction groove 3-4, protrusion 3-5, positioning pin 3-6, intake hole 3-7, print head module 4, material extrusion device 4-1, needle clamp 4-2, hug hoop bracket 4-2-1, connector 4-2-2, hug hoop 4-2-3, needle base 4-3-1, ceramic needle tip 4-3-2, printing needle 4-3, vision and measurement device 5, tilt observation assembly 5-1, sensing and measurement assembly 5-2, cleaning device 6, contact height measurement device 7, etc. are used, but the possibility of using other terms is not excluded. These terms are used only for conveniently explaining and interpreting the essence of the present invention, and it is contrary to the spirit of the present invention to interpret them as additional restrictions.

[0275] The above-described device embodiment is merely illustrative, in which the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, i.e., located in one place or distributed among multiple network units. Some or all of the modules therein may be selected according to actual needs to achieve the purpose of the embodiment. Those skilled in the art can understand and implement it without any creative effort.

[0276] From the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be realized by a platform that adds general hardware required for software, and of course by hardware. Based on such understanding, the above technical solution can be substantially embodied in the form of a software product, and the control terminal software product may be stored in a control terminal readable storage medium such as a ROM / RAM, a magnetic disk, an optical disk, etc., and includes a plurality of instructions for a control terminal device (such as a personal control terminal, a server, or a network device) to execute the method described in each embodiment or a specific part of the embodiment.

[0277] Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention, and are not intended to limit the same. The present invention is described in detail with reference to the above embodiments. However, those skilled in the art can still modify the technical solutions described in the above embodiments or make equivalent substitutions for some technical features therein, and such modifications or substitutions will not deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for printing an LED retaining wall on a display panel, comprising: For a printing task, a pre-printing preparatory operation is performed, and a target substrate is scanned by a measuring system of a printing device of an LED retaining wall of a display panel to obtain flatness data of the target substrate; moving a target multi-needle module to an initial printing position of the target substrate by a motion control system, and adjusting a printing receiving distance of the target multi-needle module by a Z-axis controller based on the received flatness data; According to a preset air pressure parameter and a target line width, a layer printing is performed on the upper surface of the target substrate in the target workstation by the target multi-needle module, and a target LED retaining wall is cured and generated under the condition that the printing height is within a target height range; A printing method, characterized in that the target workstation includes a first workstation and / or a second workstation, the target LED retaining wall includes a horizontal LED retaining wall and a vertical LED retaining wall, the target multi-needle module includes a first module and / or a second module, the printing height is a cumulative layer height corresponding to a number of printed layers, and the printing task includes at least determining the target line width and target height according to the target substrate.

2. adjusting the print receiving distance of the target multi-needle module by a Z-axis controller based on the received flatness data; According to the flatness data and the target corresponding relationship, a vertical distance between each printing position of the target substrate and the target multi-needle module is obtained as an actual value of the printing receiving distance; and adjusting the actual value of the print receiving distance to the target value of the print receiving distance by the Z-axis controller when the target multi-needle module is located at the corresponding print position; 2. The method for printing an LED retaining wall on a display panel according to claim 1, wherein the target values ​​of the print receiving distances corresponding to the respective print positions are the same.

3. The performing of the pre-printing operation includes: After filling a syringe with a printing material, attaching a printing needle to the syringe and connecting the syringe to a fluid control system through the printing needle; and controlling the motion control system by a control terminal to perform a mechanical reset operation; The printing method for an LED retaining wall of a display panel as described in claim 1, characterized in that the printing material matches the width-height ratio formed by the printing material, the inner diameter parameter of the printing needle matches the target line width, and the number of printing layers is set based on the width-height ratio of the target LED retaining wall, the target line width and the target height.

4. The printing method for an LED retaining wall of a display panel as described in claim 3, characterized in that before the motion control system moves the target multi-needle module to an initial printing position on the target substrate, pre-printing is performed under preset air pressure parameters until the printing needles stably discharge material, and the motion control system controls the suction device to move away from the pre-printing area.

5. According to the preset air pressure parameters and the target line width, the target multi-needle module performs layer printing on the upper surface of the target substrate in the target workstation, and under the condition that the printing height is within the target height range, curing and generating a target LED retaining wall; According to the preset air pressure parameters and the target line width, the first module performs lamination printing on the upper surface of the target substrate at the first workstation, and generates a vertical LED retaining wall, under the condition that the printing height complies with the target height; The printing method for an LED retaining wall of a display panel as described in claim 1, characterized in that the second module performs layered printing on the upper surface of the target substrate at the second workstation based on the pre-set air pressure parameters and the target line width, and generates a lateral LED retaining wall, under the condition that the printing height complies with the target height.

6. According to the preset air pressure parameters and the target line width, the target multi-needle module performs layer printing on the upper surface of the target substrate in the target workstation, and under the condition that the printing height is within the target height range, curing and generating a target LED retaining wall; According to the preset air pressure parameters and the target line width, the target multi-needle module performs layer printing on the top surface of the target substrate at the first workstation or the second workstation to generate a vertical LED retaining wall, under the condition that the printing height complies with the target height; The printing method for an LED retaining wall of a display panel as described in claim 1, characterized in that it includes rotating the first workstation or the second workstation by 90 degrees, and causing the target multi-needle module to perform layered printing on the upper surface of the target substrate, thereby generating a vertical LED retaining wall, under the condition that the printing height complies with the target height.

7. A non-transitory computer-readable storage medium having a computer program stored thereon, the non-transitory computer-readable storage medium being characterized in that, when the computer program is executed by a processor, it performs the method for printing an LED retaining wall of a display panel according to any one of claims 1 to 6.

8. A printing device for an LED wall of a display panel, a motion control system connected to the control terminal and configured to control printing of the target LED retaining wall on the top surface of the target substrate at the target workstation; a suction device connected to the motion control system and configured to suction a lower surface of the target substrate to a suction cup by a vacuum pump; a measurement system including a sensor and a sensor controller connected to the control terminal and configured to measure planarity data of the target substrate; a Z-axis controller connected to the control terminal and configured to control a print receiving distance between a target multi-needle module and a top surface of the target substrate; the target multi-needle module including a printing needle and a fluid control system connected to the Z-axis controller and configured to provide pre-set air pressure parameters to the printing needle; a target workstation connected to the motion control system and configured to receive the target substrate such that the target multi-needle module performs layer-by-layer printing of a target LED retaining wall on a top surface of the target substrate; A printing apparatus characterized in that the target workstation includes a first workstation and / or a second workstation, the target LED retaining wall includes a horizontal LED retaining wall and a vertical LED retaining wall, the target multi-needle module includes a first module and / or a second module, the first module matches the first workstation and the second module matches the second workstation, and the target substrate includes a PCB substrate (printed circuit board) or a glass substrate.

9. The target workstation includes: a cleaning area configured to clean and store the printing needles; a pre-printing area configured to perform pre-printing under preset air pressure parameters until the printing needles stably discharge material, and to control the suction device to move away from the pre-printing area by the motion control system; Preferably, the motion control system specifically controls the suction device to move in an XY plane when the target workstation includes a first workstation and a second workstation, so that the first module prints the vertical LED retaining wall on the target substrate in the first workstation; configured to send a first movement command to the suction device, so that the suction device transfers and moves the target substrate within an XY plane of the second workstation according to the first movement command, and the second module prints the lateral LED retaining wall on the target substrate at the second workstation; Preferably, the motion control system specifically controls the suction device to move in an XY plane when the target workstation includes a first workstation or a second workstation, so that the target multi-needle module prints the vertical LED retaining wall on the target substrate at the target workstation; sending a second motion command to the target workstation, so that the target workstation rotates 90° according to the second motion command, and then the suction device is driven to move in an XY plane, so that the target multi-needle module prints the lateral LED retaining wall on the target substrate at the target workstation; The display panel LED retaining wall printing device according to claim 8, characterized in that it preferably includes one or more of the Z-axis controllers.

10. A printing apparatus for LED sealed retaining walls, comprising: a processing table; and a three-axis motion module connected to a corresponding printing head module and installed on the processing table, wherein the three-axis motion module includes a horizontal motion module connected to the processing table and a lifting motion module installed across the processing table, the printing head module is located on the lifting motion module, and the horizontal motion module is provided with a loading module corresponding to the printing head module, the loading module includes a base, a three-axis rotating table and a vacuum suction cup installed from bottom to top, a suction groove is formed on the surface of the vacuum suction cup, a plurality of protrusions are formed in the suction groove, and a plurality of positioning pins are provided at the corners of the vacuum suction cup, the plurality of positioning pins are located on two adjacent sides of the vacuum suction cup, and the processing table is further provided with a visual and measuring device corresponding to the loading module.

11. The processing table is formed with a gantry, the lifting motion module is mounted on the gantry, and the print head module and the vision and measuring device are both mounted on the gantry; Preferably, a plurality of suction holes are formed in the suction groove, and are symmetrically formed along the center of the suction groove, and a vacuum pressure regulating valve communicating with the suction holes is attached to the lower part of the vacuum suction cup, Preferably, at least two locating pins are provided on each of adjacent sides of the vacuum suction cup, Preferably, the print head module includes a material extrusion device, a needle clamp and a printing needle connected in order from top to bottom, the needle clamp is fixedly connected to the lifting motion module, and the material base device is fixedly connected to the needle clamp, and the printing needle is connected to the bottom of the needle clamp; Preferably, the needle clamp includes a hook-hoop bracket and a connector connected to the bottom of the hook-hoop bracket, and a top of the hook-hoop bracket is formed with a hook-hoop that fits the material extrusion device, and the hook-hoop clamps the material extrusion device; Preferably, the upper part of the connector is configured as a Luer female connector connected to the outlet of the material extrusion device, and the lower part of the connector is a Luer male connector connected to the printing needle; Preferably, the printed needle comprises a needle base and a ceramic needle tip, the top of the needle base being configured as a corresponding Luer female connector; Preferably, the vision and measurement device includes an oblique observation assembly obliquely mounted to a side of the print head module, and a sensing and measurement assembly vertically connected to the gantry, and the oblique observation assembly is mounted toward the print needle; The printing apparatus for LED sealed retaining walls as claimed in claim 10, characterized in that, preferably, the processing table is further provided with a corresponding cleaning device and a contact height measuring device.

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