Inkjet printing system and method, apparatus, storage medium for oled substrates

Abstract

This application discloses an inkjet printing system, method, apparatus, and storage medium for OLED substrates, relating to the technical field of OLED printing. The inkjet printing system includes a printing module, which comprises a printing motion platform, an ink path unit, a first printhead module on a first motion axis, and a second printhead module on a second motion axis. The first printhead module includes a first printhead and a second printhead, and the second printhead module includes a third printhead. The method includes: determining a target printing scheme based on a target printing pattern, wherein the target printing scheme includes a first motion trajectory of the first and second printheads, a second motion trajectory of the third printhead, operating parameters of the printing motion platform, and inkjet parameters of the ink path unit; and controlling the printing module to perform inkjet printing operations according to the target printing scheme. This application achieves a synchronous printing process for OLED substrates through a single transmission, shortening the printing cycle and improving printing accuracy.

Description

Technical Field

[0001] This application relates to the field of OLED printing technology, and more particularly to inkjet printing systems, methods, equipment, and storage media for OLED substrates. Background Technology

[0002] OLED (Organic Light-Emitting Diode) inkjet printing uses solvents to melt the OLED organic materials, ensuring the ink's stability and rheological properties to meet the requirements of inkjet printing equipment. The substrate is treated to ensure the ink spreads evenly and forms the desired light-emitting layer. A printing pattern is designed as needed, and the material is directly sprayed onto the substrate surface using inkjet printing technology to form red, green, and blue organic light-emitting layers. After printing, drying and curing are performed to ensure the material's stability and performance.

[0003] Currently, the printing of RGB pixel slots on OLED substrates mostly uses a color-separation printing method, employing three color printheads: R (Red), G (Green), and B (Blue). The printheads are printed sequentially in the order of R, G, and B to complete the full coverage printing of a single color pixel slot on the substrate. Furthermore, substrate calibration and pixel slot positioning are required during the three printing processes of R, G, and B, resulting in a long printing cycle and a tendency to accumulate positioning deviations. This can cause ink droplets to fall outside the pixel slot area and into the blank area between pixel slots, or even into adjacent pixel slots. Summary of the Invention

[0004] The main objective of this application is to provide an inkjet printing system, method, apparatus, and storage medium for OLED substrates, which aims to achieve synchronous printing of OLED substrates through a single transmission, thereby shortening the printing cycle and improving printing accuracy.

[0005] To achieve the above objectives, this application proposes an inkjet printing method for an OLED substrate. The method is applied to an inkjet printing system for an OLED substrate. The system includes a printing module, which comprises a printing motion platform, an ink path unit, a first motion axis and a second motion axis arranged in parallel, a first printhead module on the first motion axis, and a second printhead module on the second motion axis. The first printhead module includes a first printhead for ejecting a first color and a second printhead for ejecting a second color. The second printhead module includes a third printhead for ejecting a third color. The first printhead, the second printhead, and the third printhead are respectively connected to ink paths of different colors in the ink path unit. The printing motion platform carries the substrate and moves along the third motion axis. The first motion axis and the second motion axis are perpendicular to the third motion axis. The method includes the following steps:

[0006] Based on the target printing pattern, a target printing scheme is determined, wherein the target printing scheme includes the first motion trajectory of the first printhead and the second printhead in the first printhead module, the second motion trajectory of the third printhead in the second printhead module, the operating parameters of the printing motion platform, and the ink jet parameters of the ink path unit;

[0007] The printing module is controlled to perform inkjet printing operations according to the target printing scheme.

[0008] In one feasible embodiment, the step of determining the target printing scheme based on the target printing pattern includes:

[0009] Based on the repeating units of the pixel slots on the substrate, an overall pixel slot distribution model is constructed;

[0010] Based on the target printing pattern, the first pattern to be printed by the first printhead module and the second pattern to be printed by the second printhead module are parsed out;

[0011] Based on the overall pixel slot distribution model, the first pattern, and the second pattern, the first motion trajectory and the second motion trajectory are determined;

[0012] Based on the first motion trajectory and the second motion trajectory, the operating parameters of the printing motion platform are determined;

[0013] The inkjet parameters are determined based on the first motion trajectory, the second motion trajectory, and the operating parameters of the printing motion platform.

[0014] In one feasible embodiment, prior to the step of determining the target printing scheme based on the target printing pattern, the method further includes:

[0015] Determine the coordinates of a preset target on the substrate;

[0016] The angle between the substrate and the third motion axis is determined based on the coordinates of the preset target.

[0017] Based on the included angle, the printing motion platform is controlled to rotate the substrate to complete the attitude calibration of the substrate.

[0018] In one feasible embodiment, the step of controlling the printing module to perform inkjet printing operation according to the target printing scheme includes:

[0019] Determine the target starting position of the first printhead and the target starting position of the third printhead in the target printing scheme;

[0020] Control the first nozzle to move to the target starting position of the first nozzle, and control the third nozzle to move to the target starting position of the third nozzle;

[0021] Based on the first motion trajectory, control the first printhead to start inkjet printing;

[0022] Obtain the first motion distance, wherein the first motion distance is the distance between the current position of the printing motion platform on the third motion axis and the target starting position of the first nozzle;

[0023] When the first movement distance satisfies the first preset installation interval between the first printhead and the second printhead, the second printhead is controlled to start inkjet printing.

[0024] When the first movement distance satisfies the second preset installation interval between the first printhead and the third printhead, the third printhead is controlled to start inkjet printing based on the second movement trajectory.

[0025] In one feasible embodiment, the pixel slots on the substrate include a first color pixel slot, a second color pixel slot, and a third color pixel slot. The volume of the third color pixel slot is greater than the volume of the second color pixel slot or the volume of the first color pixel slot. The volume of the second color pixel slot is the same as the volume of the first color pixel slot.

[0026] In one feasible embodiment, prior to the step of determining the target printing scheme based on the target printing pattern, the method further includes:

[0027] Determine the volume difference between the third color pixel slot and the first color pixel slot or the second color pixel slot;

[0028] The rotation angle of the third nozzle is calculated based on the volume difference;

[0029] The third nozzle is controlled to rotate according to the rotation angle.

[0030] In one feasible embodiment, the inkjet printing system for the OLED substrate includes a robotic arm and a post-processing module, and the method further includes:

[0031] The robotic arm is controlled to transfer the substrate between the printing module and the post-processing module.

[0032] This application embodiment also provides an inkjet printing system for an OLED substrate, the system comprising:

[0033] The printing module includes a printing motion platform, an ink path unit, a first motion axis and a second motion axis arranged in parallel, a first printhead module on the first motion axis and a second printhead module on the second motion axis. The first printhead module includes a first printhead for spraying a first color and a second printhead for spraying a second color. The second printhead module includes a third printhead for spraying a third color. The first printhead, the second printhead and the third printhead are respectively connected to ink paths of different colors in the ink path unit. The printing motion platform is used to carry the substrate and move along the third motion axis. The first motion axis and the second motion axis are perpendicular to the third motion axis.

[0034] The control module is used to determine a target printing scheme based on the target printing pattern, wherein the target printing scheme includes the first motion trajectory of the first and second printheads in the first printhead module, the second motion trajectory of the third printhead in the second printhead module, the operating parameters of the printing motion platform, and the inkjet parameters of the ink path unit; and controls the printing module to perform inkjet printing operation according to the target printing scheme.

[0035] This application also provides an electronic device, the device including: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the inkjet printing method for an OLED substrate as described above.

[0036] This application embodiment also provides a storage medium, which is a computer-readable storage medium, and stores a computer program thereon. When the computer program is executed by a processor, it implements the steps of the inkjet printing method for OLED substrates as described above.

[0037] This application provides an inkjet printing method for an OLED substrate. The method is applied to an inkjet printing system for an OLED substrate. The system includes a printing module, which includes a printing motion platform, an ink path unit, a first motion axis and a second motion axis arranged in parallel, and a first printhead module on the first motion axis and a second printhead module on the second motion axis. The first printhead module includes a first printhead for spraying a first color and a second printhead for spraying a second color. The second printhead module includes a third printhead for spraying a third color. The first, second, and third printheads are respectively connected to ink paths of different colors in the ink path unit. The printing motion platform carries the substrate and moves along the third motion axis. The first and second motion axes are perpendicular to the third motion axis. The method includes the following steps: determining a target printing scheme according to a target printing pattern. The target printing scheme includes the first motion trajectory of the first and second printheads in the first printhead module, the second motion trajectory of the third printhead in the second printhead module, the operating parameters of the printing motion platform, and the inkjet parameters of the ink path unit; and controlling the printing module to perform inkjet printing operations according to the target printing scheme. This application embodiment achieves synchronous printing of the first, second, and third colors in a single transmission process by controlling the first and second motion trajectories of the first and second printheads in the first printhead module, the second motion trajectory of the third printhead in the second printhead module, the operating parameters of the printing motion platform, and the inkjet parameters of the ink path unit. This avoids the need for separate positioning and calibration for each of the three colors in the traditional printing process for the same pattern, and also avoids errors caused by multiple movements and alignment processes that affect the accuracy of pattern printing. Furthermore, by triggering the inkjet process of each printhead according to the inkjet parameters, the additional ink path preparation time is eliminated, shortening the printing time. This application realizes a synchronous printing process of OLED substrates in a single transmission, shortening the printing cycle and improving printing accuracy. Attached Figure Description

[0038] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0039] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 A schematic flowchart of an inkjet printing method for an OLED substrate provided in an embodiment of this application;

[0041] Figure 2 A schematic diagram of an inkjet printing system for an OLED substrate provided in an embodiment of this application;

[0042] Figure 3 This is a schematic diagram of the printhead and pixel slot printing provided in the embodiments of this application;

[0043] Figure 4 This is a schematic diagram of a partial printed pattern provided in an embodiment of this application;

[0044] Figure 5 This is a schematic diagram of the pixel groove structure on the OLED substrate provided in an embodiment of this application;

[0045] Figure 6 This is a schematic diagram of the nozzle rotation and splicing provided in the embodiments of this application;

[0046] Figure 7 This is a schematic diagram of the equipment structure of the hardware operating environment involved in the inkjet printing method for the OLED substrate provided in the embodiments of this application.

[0047] Explanation of reference numerals in the attached figures:

[0048] 10. Printing module; 110. Printing motion platform; 120. Ink path unit; 130. First motion axis; 131. First printhead module; 132. Second printhead module; 1311. First printhead; 1312. Second printhead; 1313. Third printhead; 133. Nozzle; 134. Ink droplet; 140. Second motion axis; 150. Third motion axis; 20. Image processing unit; 30. Substrate; 31. Pixel slot; 301. First color pixel slot; 302. Second color pixel slot; 303. Third color pixel slot; 40. Control module.

[0049] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0050] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0051] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0052] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0053] Currently, the printing of RGB pixel slots on OLED substrates mostly uses a color-separation printing method, using three color printheads (R, G, and B) to complete the full coverage printing of a single color pixel slot on the substrate in the order of R, G, and B. Furthermore, substrate calibration and pixel slot positioning need to be performed separately during the three printing processes of R, G, and B. The printing cycle is relatively long and is prone to cumulative positioning deviations, which may cause ink droplets to fall beyond the pixel slot area and into the blank area between pixel slots, or even into adjacent pixel slots.

[0054] This application provides an inkjet printing method for an OLED substrate. The method is applied to an inkjet printing system for an OLED substrate. The system includes a printing module, which includes a printing motion platform, an ink path unit, a first motion axis and a second motion axis arranged in parallel, and a first printhead module on the first motion axis and a second printhead module on the second motion axis. The first printhead module includes a first printhead for spraying a first color and a second printhead for spraying a second color. The second printhead module includes a third printhead for spraying a third color. The first, second, and third printheads are respectively connected to ink paths of different colors in the ink path unit. The printing motion platform carries the substrate and moves along the third motion axis. The first and second motion axes are perpendicular to the third motion axis. The method includes the following steps: determining a target printing scheme according to a target printing pattern. The target printing scheme includes the first motion trajectory of the first and second printheads in the first printhead module, the second motion trajectory of the third printhead in the second printhead module, the operating parameters of the printing motion platform, and the inkjet parameters of the ink path unit; and controlling the printing module to perform inkjet printing operations according to the target printing scheme. This application embodiment achieves synchronous printing of the first, second, and third colors in a single transmission process by controlling the first and second motion trajectories of the first and second printheads in the first printhead module, the second motion trajectory of the third printhead in the second printhead module, the operating parameters of the printing motion platform, and the inkjet parameters of the ink path unit. This avoids the need for separate positioning and calibration for each of the three colors in the traditional printing process for the same pattern, and also avoids errors caused by multiple movements and alignment processes that affect the accuracy of pattern printing. Furthermore, by triggering the inkjet process of each printhead according to the inkjet parameters, the additional ink path preparation time is eliminated, shortening the printing time. This application realizes a synchronous printing process of OLED substrates in a single transmission, shortening the printing cycle and improving printing accuracy.

[0055] The first embodiment of this application provides an inkjet printing method for an OLED substrate, referring to... Figure 1 and Figure 2An inkjet printing system for OLED substrates is described. The system includes a printing module 10, which comprises a printing motion platform 110, an ink path unit 120, a first motion axis 130 and a second motion axis 140 arranged in parallel, and a first printhead module 131 on the first motion axis 130 and a second printhead module 132 on the second motion axis 140. The first printhead module 131 includes a first printhead 1311 for spraying a first color and a second printhead 1312 for spraying a second color. The second printhead module 132 includes a third printhead 1313 for spraying a third color. The first printhead 1311, second printhead 1312, and third printhead 1313 are respectively connected to ink paths of different colors in the ink path unit. The printing motion platform 110 carries the substrate and moves along the third motion axis 150. The first motion axis 130 and the second motion axis 140 are perpendicular to the third motion axis 150. The method includes the following steps:

[0056] Step S10: Determine the target printing scheme according to the target printing pattern. The target printing scheme includes the first motion trajectory of the first printhead 1311 and the second printhead 1312 in the first printhead module 131, the second motion trajectory of the third printhead 1313 in the second printhead module 132, the operating parameters of the printing motion platform 110, and the ink jetting parameters of the ink path unit 120.

[0057] The target printing pattern is the graphic that the user expects to ultimately display on the OLED substrate through inkjet printing.

[0058] A target printing scheme is a set of instructions and parameters designed to achieve a target printed pattern.

[0059] The first motion axis 130 and the second motion axis 140 are arranged in parallel and are both perpendicular to the third motion axis. A first printhead module 131 is mounted on the first motion axis 130, and a second printhead module 132 is mounted on the second motion axis 140. Through the movement of these two motion axes, the first printhead 1311 and the second printhead 1312 in the first printhead module 131, and the third printhead 1313 in the second printhead module 132, can be controlled to move in a plane perpendicular to the third motion axis 150, thereby achieving printing at different positions on the substrate.

[0060] The first printhead module 131 and the second printhead module 132 are respectively mounted on the first motion axis 130 and the second motion axis 140, and are the components that actually perform inkjet operation. The printhead module contains multiple nozzles, which can accurately jet ink onto designated positions on the substrate according to the instructions of the control module.

[0061] During the printing process, the first printhead module 131 needs to move along a specific path, which is the first motion trajectory. The first motion trajectory determines how the first printhead 1311 and the second printhead 1312 in the first printhead module 131 move along the first motion axis 130 to ensure that the ink can accurately fall on the substrate and form the target printed pattern during the movement of the substrate along the third motion axis 150.

[0062] The second motion trajectory is the motion path of the third printhead 1313 in the second printhead module 132, which works in conjunction with the first motion trajectory to complete the printing of the target pattern.

[0063] The printing motion platform 110 is a platform for placing the printing media and needs to move in a specific time sequence during the printing process. The operating parameters specify when the printing motion platform 110 begins to move, its speed, and the distance it travels. By setting reasonable operating parameters, the relative position between the printhead module and the substrate can be ensured to be accurate, thereby guaranteeing print quality. In the actual printing process, the substrate 30 is placed on the printing motion platform 110. By moving the printing motion platform 110 along the third motion axis 150, different areas of the substrate 30 can be moved below the printhead module for printing. This allows the printhead to spray ink from a relatively fixed position, achieving a complete printing process covering the entire substrate 30 through the platform's movement.

[0064] The ink delivery unit 120 is responsible for delivering ink to the printhead module and controlling the ink ejection. The ink ejection parameters include specific parameters such as the ink ejection time and ink volume of the printhead module. These parameters are closely coordinated with the movement trajectory of the printhead module and the operating parameters of the printing motion platform 110 to ensure that the ink is ejected at the correct position and time to form a clear and accurate target printed pattern.

[0065] The first printhead 1311, the second printhead 1312, and the third printhead 1313 are respectively connected to the ink paths of different colors in the ink path unit 120, ensuring that each printhead corresponds to a different color and that the ink jetting parameters of each printhead can be determined independently, which facilitates better control of the entire inkjet printing process.

[0066] Optionally, the first motion axis 130 can be the X1 axis, the second motion axis 140 can be the X2 axis, and the third motion axis 150 is the Y axis.

[0067] Step S20: Control the printing module 10 to perform inkjet printing operation according to the target printing scheme.

[0068] In one feasible embodiment, after determining the target printing scheme, the control module controls the printing module 10 according to the scheme to perform inkjet printing. Specifically, the control module sends a series of control signals to the printing module 10, including motion control signals for the printhead module, motion control signals for the printing motion platform 110, and inkjet control signals for the ink path unit 120. After receiving these signals, the printing module 10 precisely controls the movement of the printhead module, the movement of the printing motion platform 110, and the ink ejection according to the parameters and timing requirements in the target printing scheme, thereby gradually forming the target printed pattern on the substrate.

[0069] In one feasible embodiment, step S20, which determines the target printing scheme based on the target printing pattern, includes:

[0070] Step S21: Construct an overall pixel slot distribution model based on the repeating units of pixel slots 31 on the substrate 30;

[0071] In one feasible embodiment, an overall pixel slot distribution model is generated through geometric modeling or algorithms based on the repeating units of the pixel slots on the substrate (e.g., periodically arranged pixel slots). The overall pixel slot distribution model is used to plan the ink drop points on the substrate, ensuring that the inkjet position accurately matches the pixel slots and avoiding ink overflow or misalignment.

[0072] Step S22: Based on the target printing pattern, parse out the first pattern to be printed by the first printhead module 131 and the second pattern to be printed by the second printhead module 132.

[0073] In one feasible embodiment, since the printing system includes a first printhead module 131 and a second printhead module 132, in order to improve printing efficiency or achieve a specific printing effect, the target printing pattern needs to be parsed and divided into two parts. The first pattern is the part printed by the first printhead module 131, and the second pattern is the part printed by the second printhead module 132. The parsing process is usually based on factors such as the characteristics, color, and position of the pattern to ensure that the two printhead modules can work together to complete the printing of the target printing pattern.

[0074] Step S23: Determine the first motion trajectory and the second motion trajectory based on the overall pixel slot distribution model, the first pattern, and the second pattern;

[0075] In a feasible embodiment, determining the first and second motion trajectories requires comprehensive consideration of the overall pixel slot distribution model, the first pattern, and the second pattern. The first nozzle module 131 moves along the first motion axis 130, accurately spraying ink into the corresponding pixel slots to form the first pattern; the second nozzle module 132 moves along the second motion axis 140, accurately spraying ink into the corresponding pixel slots to form the second pattern. Based on the pixel distribution in the first and second patterns obtained from the overall pixel slot distribution model, the first and second motion trajectories can be planned.

[0076] Step S24: Determine the operating parameters of the printing motion platform 110 based on the first motion trajectory and the second motion trajectory;

[0077] In one feasible embodiment, during the printing process, the printhead module and the printing motion platform 110 need to cooperate with each other to ensure that the printhead module can accurately spray ink into the pixel slots on the substrate. For example, after the first printhead module 131 completes the printing of the corresponding pixel slot, the printing motion platform 110 needs to move up or down a certain distance according to predetermined operating parameters so that the first printhead module 131 can print the next pixel slot.

[0078] Step S25: Determine the inkjet parameters based on the first motion trajectory, the second motion trajectory, and the operating parameters of the printing motion platform 110.

[0079] In one feasible embodiment, when the printhead module and the printing motion platform 110 are in the appropriate position, the ink path unit 120 needs to eject an appropriate amount of ink according to the inkjet parameters to fill the pixel slots in the corresponding pattern. For example, when the first printhead module 131 moves above a certain pixel slot, the ink path unit 120 will eject a certain amount of ink at a precise time point according to the inkjet parameters to ensure that the ink falls accurately into the pixel slot.

[0080] For example, a substrate with dimensions of 920mm × 730mm is provided (pixel pitch 20μm, B pixel slot size 150μm × 45μm × 2μm, R and G pixel slot sizes 100μm × 45μm × 2μm). With the droplet size controlled at approximately 4pl, the droplet diameter is approximately 20μm. If the control module resolution is set to 1200dpi, the nozzle ink droplet spacing during printing is 25.4 / 1200 × 1000 = 21.167μm. Therefore, only one droplet can be planned to be printed per pixel slot by a single nozzle. To achieve the required ink volume for each pixel slot, multiple nozzles or repeated printing with a single nozzle is necessary. Taking the Samba printhead as an example, this printhead has 2048 nozzles. Assuming all nozzles are usable and the ink volume meets the 4pl confidence interval (99%), a single pass can cover a maximum of 256 pixel slots. Specifically, depending on the spacing and size of a particular color pixel slot, refer to... Figure 3 Each pixel slot 31 can correspond to four ink droplets 134 ejected by nozzles 133. The printhead needs to be moved 8 times to cover all pixel slots. If the pixel slot requires 32pl, it needs to be repeated twice, that is, 16 passes to complete the printing process specified for all pixel slots.

[0081] For example, refer to Figure 4 It is displayed as a partial printed image of a certain color, where dots in the same row are printed by the same nozzle at different positions, and dots in the same column are printed by different nozzles.

[0082] This embodiment provides an inkjet printing method for OLED substrates. The method is applied to an inkjet printing system for OLED substrates. The system includes a printing module, which includes a printing motion platform, an ink path unit, a first motion axis and a second motion axis arranged in parallel, and a first printhead module on the first motion axis and a second printhead module on the second motion axis. The first printhead module includes a first printhead for spraying a first color and a second printhead for spraying a second color. The second printhead module includes a third printhead for spraying a third color. The first, second, and third printheads are respectively connected to ink paths of different colors in the ink path unit. The printing motion platform carries the substrate and moves along the third motion axis. The first and second motion axes are perpendicular to the third motion axis. The method includes the following steps: determining a target printing scheme according to a target printing pattern. The target printing scheme includes the first motion trajectory of the first and second printheads in the first printhead module, the second motion trajectory of the third printhead in the second printhead module, the operating parameters of the printing motion platform, and the inkjet parameters of the ink path unit; and controlling the printing module to perform inkjet printing operations according to the target printing scheme. This application embodiment achieves synchronous printing of the first, second, and third colors in a single transmission process by controlling the first and second motion trajectories of the first and second printheads in the first printhead module, the second motion trajectory of the third printhead in the second printhead module, the operating parameters of the printing motion platform, and the inkjet parameters of the ink path unit. This avoids the need for separate positioning and calibration for each of the three colors in the traditional printing process for the same pattern, and also avoids errors caused by multiple movements and alignment processes that affect the accuracy of pattern printing. Furthermore, by triggering the inkjet process of each printhead according to the inkjet parameters, the additional ink path preparation time is eliminated, shortening the printing time. This application realizes a synchronous printing process of OLED substrates in a single transmission, shortening the printing cycle and improving printing accuracy.

[0083] Based on the first embodiment of this application, in the second embodiment of this application, the content that is the same as or similar to that in the first embodiment described above can be referred to the above description and will not be repeated hereafter. Based on this, before step S20, which determines the target printing scheme according to the target printing pattern, the following method is also included:

[0084] Step A10: Determine the coordinates of the preset target on the substrate 30;

[0085] In one feasible embodiment, the coordinates of the target in a specific coordinate system are obtained by identifying and measuring the preset target.

[0086] Optionally, the coordinate system corresponding to the coordinate values ​​is a unified coordinate system after conversion, which facilitates the accurate determination and calculation of the positions of the nozzle module, substrate 30, and pixel slot 31 on substrate 30.

[0087] Preset targets refer to specific markers pre-set on the substrate 30. Preset targets have obvious characteristics, which facilitates recognition by the image processing unit 20. The position and layout of the preset targets are usually known and fixed, and they are used as reference points to determine the position and orientation of the substrate.

[0088] Optionally, the preset targets can be located at the four corners of the blank outer perimeter of the target printing area on the substrate, or at the two ends of the substrate's Y-axis. For example, the coordinates M1(x1,y1) and M2(x2,y2) of two preset targets at the two ends of the substrate's Y-axis can be obtained.

[0089] In one feasible embodiment, the substrate 30 placed on the printing motion platform 110 is calibrated before printing begins to eliminate potential tilting or offset issues during substrate placement, ensuring the substrate is in the correct position and angle. Then, the tiny pixel slots on the substrate are precisely located to obtain accurate position information for each pixel slot, providing precise coordinates for subsequent printing operations.

[0090] Substrate orientation calibration refers to the process where, when the substrate is placed on the printing motion platform 110, various factors may cause the substrate to tilt or shift, resulting in orientation problems. The image processing unit 20 detects the actual orientation of the substrate and adjusts it to the correct orientation through a corresponding adjustment mechanism. This ensures that the printhead can accurately align with the pixel slots on the substrate during printing, avoiding printing errors caused by incorrect substrate orientation.

[0091] The OLED substrate has many tiny pixel slots, which are the locations where ink will eventually fill. The image processing unit 20 can accurately locate the position of each pixel slot. This positioning information is transmitted to the control module to control the ink ejection position of the printhead.

[0092] In one feasible implementation, the pattern processing unit is located on the first motion axis 130 and / or the second motion axis 140. Its main function is to acquire and analyze the pattern of the substrate on the printing motion platform 110. This includes capturing the pattern of the substrate, analyzing the placement state of the substrate 30 on the printing motion platform 110, and detecting any tilting, offset, or other posture problems. Based on the analysis results, the system can control relevant mechanisms to adjust the substrate to the correct posture to ensure the accuracy of subsequent printing. It also includes using high-precision pattern recognition technology to accurately identify the positions of tiny pixel slots on the substrate in the acquired pattern. After obtaining the precise coordinate information of each pixel slot, it is transmitted to the control module so that the printhead can accurately spray ink into these pixel slots.

[0093] The pattern processing unit includes a high-resolution CCD (Charge-Coupled Device) configured with FPGA (Field-Programmable Gate Array) pattern processing technology.

[0094] The first motion axis 130 and the second motion axis 140 are arranged in parallel and perpendicular to the third motion axis 150 of the printing motion platform 110. The pattern processing unit is mounted on these two motion axes, allowing it to move flexibly in a plane perpendicular to the third motion axis. The pattern processing unit can easily reach different positions on the substrate to acquire patterns, fully covering the entire substrate area and ensuring accurate positioning of all pixel slots on the substrate.

[0095] The pattern processing unit can be located next to the first printhead module 131, so that after completing pattern acquisition and analysis, the pattern processing unit can quickly feed back the positioning information to the control module, thereby accurately controlling the movement of the printhead and the inkjet operation, realizing close coordination between pattern processing and printing actions, and improving printing accuracy and efficiency.

[0096] Optionally, the pattern processing unit can be installed only on the first motion axis 130, only on the second motion axis 140, or simultaneously on both motion axes. This flexible positioning method can be optimized according to actual printing needs and system configuration. For example, for some smaller substrates, installing the pattern processing unit on only one motion axis may be sufficient to meet positioning requirements; while for large substrates or situations requiring extremely high positioning accuracy, the pattern processing unit can be installed on both motion axes to achieve more comprehensive and accurate pattern acquisition and analysis.

[0097] Step A20: Determine the angle between the substrate 30 and the third motion axis 150 based on the coordinates of the preset target;

[0098] In one feasible embodiment, the angle between the substrate and the third motion axis is calculated using geometric calculation methods (such as vector operations, trigonometric functions, etc.) based on the obtained coordinates of the preset target. This angle reflects the current tilt of the substrate and is a key parameter for attitude adjustment.

[0099] Optionally, based on the coordinates M1(x1,y1) and M2(x2,y2) of two preset targets at both ends of the substrate's Y-axis, the angle θ between the substrate and the Y-axis is calculated using the following formula:

[0100]

[0101] In step A30, based on the included angle, the printing motion platform 110 is controlled to rotate the substrate 30 to complete the attitude calibration of the substrate 30.

[0102] In one feasible embodiment, based on a determined angle, the attitude adjustment mechanism drives the substrate to rotate, gradually adjusting the substrate's attitude to achieve the desired relative position with the third motion axis, thereby completing the substrate's attitude calibration. The calibrated substrate can meet the position and angle requirements of subsequent printing processes, improving operational accuracy and quality.

[0103] Optionally, when the angle between the substrate and the Y-axis is θ, the attitude adjustment mechanism is controlled to rotate the substrate by -θ angle to complete the substrate calibration.

[0104] In this embodiment, the coordinates of preset targets at both ends of the third motion axis (Y-axis) of the substrate are collected to determine the angle between the substrate and the Y-axis. The attitude adjustment mechanism of the printing motion platform is controlled to rotate and adjust the attitude of the substrate according to the angle, so as to ensure the correct attitude of the substrate and facilitate the subsequent inkjet printing process.

[0105] Based on the first embodiment of this application, in the third embodiment of this application, the content that is the same as or similar to that in the first embodiment described above can be referred to the above description and will not be repeated hereafter. Based on this, step S20, which determines the target printing scheme according to the target printing pattern, includes:

[0106] Step S210: Determine the target starting position of the first printhead 1311 and the target starting position of the third printhead 1313 in the target printing scheme;

[0107] In one feasible embodiment, the target starting position of the first printhead 1311 is determined based on the position of the pixel slots of the first color to be printed on the substrate in the target printing scheme. Simultaneously, the target starting position of the third printhead 1313 is determined based on the position of the pixel slots of the third color on the substrate in the target printing scheme.

[0108] Determining the target starting position requires error compensation calculation. Error compensation calculation refers to the process of compensating for deviations between the actual and preset starting positions to ensure printing accuracy. This calculation takes into account various error factors and determines the necessary adjustments.

[0109] For example, a substrate with dimensions of 920mm × 730mm (pixel pitch 20μm, B pixel slot size 150μm × 45μm × 2μm, R pixel slot and G pixel slot size 100μm × 45μm × 2μm) is provided. The coordinates of the R pixel slot at the lower left corner of the substrate are (x r y r The preset starting position coordinates are (x s y s The actual starting position coordinates are (x p y pThe coordinates of the starting position of the target printing are calculated as (x, y). s +x r -x p y s +y r -y p The target printing position of printhead B is calculated using the same steps as described above, and the coordinates of the R pixel slot at the lower left corner of the substrate are determined as (x...). r y r In the case of (bx, by), the coordinates of the B pixel slot at the lower left corner of the substrate can be calculated as (bx, by) based on the pixel slot distribution, by = ry + 0.02 + 0.045.

[0110] Step S220: Control the first nozzle 1311 to move to the target starting position of the first nozzle 1311, and control the third nozzle 1313 to move to the target starting position of the third nozzle 1313.

[0111] Step S230: Based on the first motion trajectory, control the first printhead to start inkjet printing;

[0112] In one feasible embodiment, once the target starting position of the first printhead 1311 is determined, the first printhead 1311 is controlled to begin inkjet printing according to a pre-planned first motion trajectory. The first motion trajectory defines the movement path of the first printhead 1311 during the printing process, ensuring that the ink can be accurately ejected into the corresponding pixel slots.

[0113] Step S240: Obtain the first motion distance, wherein the first motion distance is the distance between the current position of the printing motion platform 110 on the third motion axis 150 and the target starting position of the first nozzle;

[0114] In one feasible embodiment, during the printing process, the printing motion platform 110 moves along the third motion axis 150. The distance between the current position of the printing motion platform 110 and the target starting position of the first printhead 1311 is obtained; this distance is the first motion distance.

[0115] The first movement distance is used to determine the time when the second printhead 1312 and the third printhead 1313 start inkjet printing, so as to ensure that after the first printhead 1311 sprays ink, the second printhead 1312 and the third printhead 1313 set an appropriate inkjet delay time by judging the first movement distance, so as to achieve synchronous inkjet printing process.

[0116] Step S250: If the first movement distance satisfies the first preset installation interval between the first printhead 1311 and the second printhead 1312, control the second printhead 1312 to start inkjet printing.

[0117] The first preset installation interval is a fixed distance pre-set based on the actual installation positions of the first printhead module 131 and the second printhead module 132 within the printhead module. When the printing motion platform 110 moves along the third motion axis 150 and the distance to the target starting position reaches the first preset installation interval, it means that the second printhead 1312 has moved to the appropriate position, that is, the position of the second color pixel slot on the corresponding substrate, and inkjet printing can begin, thereby connecting with the portion of the first color pixel slot and achieving correct printing of the pattern.

[0118] For example, the first printhead 1311 is a red printhead (R printhead), and the second printhead 1312 is a green printhead (G printhead). The R and G printheads are installed on both sides of the first motion axis 130 (X1 axis), and there is a first preset installation interval MI1 along the third motion axis 150 (Y axis). Therefore, after the R printhead starts printing, the G printhead waits for the printing motion platform 110 to move a distance of MI1 along the third motion axis 150 (Y axis) before starting to print.

[0119] Step S260: If the first movement distance satisfies the second preset installation interval between the first printhead 1311 and the third printhead 1313, control the third printhead 1313 to start inkjet printing based on the second movement trajectory.

[0120] The second preset installation interval is a fixed distance pre-set based on the actual installation positions of the first printhead 1311 in the first printhead module 131 and the third printhead 1313 in the second printhead module 132. When the distance between the printing motion platform 110 and the target starting position reaches the second preset installation interval as the printing motion platform 110 moves along the third motion axis 150, it means that the third printhead 1313 has moved to the appropriate position, that is, the position of the third color pixel slot on the corresponding substrate, and inkjet printing can begin, thereby connecting with the part of the first color pixel slot and realizing the correct printing of the pattern.

[0121] For example, the first printhead 1311 is a red printhead (R printhead), the second printhead 1312 is a green printhead (G printhead), and the third printhead 1313 is a blue printhead (B printhead). The R printhead and the B printhead have an installation interval MI2 in the direction of the third motion axis (Y axis). After the R printhead starts printing, the B printhead needs to wait for the third motion axis (Y axis) to move a distance of MI2 before it starts printing.

[0122] This embodiment determines the start time of inkjet printing for the second and third printheads after the first printhead begins inkjet printing, based on the preset installation interval of the first, second, and third printheads on the third motion axis, according to the relationship between the distance between the printing motion platform along the third motion axis and the target starting printing position and the preset installation interval. This achieves synchronous printing of the printhead modules, reduces printing errors caused by rereading alignment and movement, improves printing accuracy, and shortens the printing cycle.

[0123] Based on the third embodiment of this application, in the fourth embodiment of this application, the same or similar content as the above embodiment can be referred to the above description, and will not be repeated hereafter. On this basis, refer to Figure 5 The pixel slots 31 on the substrate 30 include a first color pixel slot 301, a second color pixel slot 302 and a third color pixel slot 303. The volume of the third color pixel slot 303 is greater than the volume of the second color pixel slot 302 or the volume of the first color pixel slot 301. The volume of the second color pixel slot 302 is the same as the volume of the first color pixel slot 301.

[0124] In one feasible embodiment, in OLED displays, the efficiency of blue light-emitting materials is relatively low. To achieve a similar light-emitting effect to red and green, more blue ink is typically required. Therefore, the third color pixel slot is a blue pixel slot, the first color pixel slot is a red pixel slot, and the second color pixel slot is a green pixel slot. Designing a larger blue ink pixel slot allows for more blue ink to be accommodated, ensuring the brightness and quality of the blue display. Since red and green light-emitting materials are relatively more efficient, the red and green ink pixel slots are of the same size and relatively short, which optimizes the substrate layout and ink usage while maintaining display quality.

[0125] In another feasible embodiment, refer to Figure 6 Before step S20, which involves determining the target printing scheme based on the target printing pattern, the method further includes:

[0126] Step B10: Determine the volume difference between the third color pixel slot 303 and the first color pixel slot 301 or the second color pixel slot 302;

[0127] In one feasible embodiment, during the printing process, the volumes of pixel slots of different colors may differ due to design or actual requirements. The volume of the third color pixel slot, along with the volumes of the first or second color pixel slots, is measured or obtained according to design parameters, and then the difference between them is calculated. This volume difference reflects the difference in the amount of ink required for each color pixel slot.

[0128] Step B20: Calculate the rotation angle of the third nozzle 1313 based on the volume difference;

[0129] In one feasible embodiment, the rotation angle of the printhead is related to the ink ejection volume and range. Based on the calculated volume difference, the required rotation angle of the third printhead can be calculated so that the printhead can eject an appropriate amount of ink to fill the third color pixel slot.

[0130] For example, since the blue pixel slots require a larger volume of ink, multiple printheads can be rotated and spliced ​​together to increase the printhead npi (Nozzles Per Inch), reduce the spacing between ink droplets within the pixel slots, and achieve simultaneous RGB printing. If the npi needs to be increased by M times, then M blue printheads need to be rotated. Arranged in parallel after the angle.

[0131] Step B30: Control the third nozzle 1313 to rotate according to the rotation angle.

[0132] In one feasible embodiment, after calculating the rotation angle of the third printhead 1313, the control module 40 sends a command to rotate the third printhead to the calculated rotation angle. The third printhead can then perform inkjet printing at the adjusted angle, thereby more accurately controlling the ink ejection volume and coverage area to meet the volume requirements of the third color pixel slot.

[0133] The third printhead 1313 is a blue printhead. Its rotation setting is to better adapt to the distribution of blue pixel slots on the substrate and the printing requirements. The arrangement at a preset angle allows the sub-printheads to cover the blue pixel slots more effectively during movement, increasing the number of nozzles corresponding to the blue pixel slots and thus increasing the npi (Nozzles Per Inch) of the nozzles corresponding to the blue pixel slots.

[0134] In addition, when the printhead moves along the second motion axis 140, the nozzles arranged at a certain angle can spray ink onto the blue pixel groove at different positions and angles, reducing the occurrence of missed sprays or uneven spraying.

[0135] In another feasible embodiment, the inkjet printing system for the OLED substrate includes a robotic arm and a post-processing module, and the method further includes:

[0136] The robotic arm is controlled to transfer the substrate 30 between the printing module 10 and the post-processing module.

[0137] The robotic arm is used to transfer the substrate between different modules. It can accurately grasp and place the substrate, avoiding errors and damage that may be caused by manual operation, and improving production efficiency and product yield.

[0138] The robotic arm has high-precision motion control capabilities, which can accurately grasp and place substrates, avoiding damage to the substrates during the transfer process, improving production efficiency, and reducing errors and uncertainties caused by manual operation.

[0139] The robotic arm can also transfer substrates from the substrate hopper in the system to the printing motion platform 110 for subsequent inkjet printing operations.

[0140] Optionally, the robotic arm sets the pressure of the vacuum suction negative pressure valve to 0.8 MPa, the transmission speed of the servo drive motor to 50 mm / s, and the gap of the anti-deviation limit block to 0.1 mm to ensure no lateral deviation during substrate transfer. The cleaned substrate is then transferred from the substrate hopper to the printing motion platform 110. After receiving the substrate, the printing motion platform 110 opens the substrate suction negative pressure valve (the pressure can be set to 0.5 MPa) to firmly attach the substrate to the platform surface, ensuring no relative movement during printing.

[0141] In one feasible embodiment, the printed substrate 30 is sequentially transferred to the vacuum drying equipment and baking equipment of the post-processing module by a robotic arm for vacuum drying and baking.

[0142] Once the substrate enters the vacuum drying equipment, the internal environment is evacuated to a vacuum, lowering the boiling point of water and causing the moisture in the substrate to evaporate rapidly at a lower temperature. This prevents high temperatures from damaging the printed pattern and substrate material, while effectively removing moisture and improving the substrate's stability and reliability. Baking involves heating the substrate at a specific temperature to further solidify the printed ink and enhance the adhesion between the ink and the substrate. Baking allows the ink to undergo a chemical reaction, forming a stable solid structure and improving the abrasion and corrosion resistance of the printed pattern. After vacuum drying removes most of the moisture, baking further enhances ink curing and performance improvement.

[0143] Optionally, a vacuum drying process can be performed based on preset vacuum levels, temperature profiles, and operating time data to evaporate most of the solutes in the ink. The substrate is then transferred to a baking device, where the process is completed according to preset temperature profiles and operating time data to remove all solvents, leaving a uniformly distributed, dense solute substrate. By adjusting the process parameters, a well-prepared OLED substrate is obtained after a single vacuum drying and baking process, effectively avoiding the coffee ring effect formed when more solute accumulates at the edges of the ink droplets than in the center during the drying process.

[0144] This application provides an inkjet printing system for OLED substrates. (Refer to...) Figure 2 The inkjet printing system for OLED substrates includes:

[0145] Printing module 10 includes a printing motion platform 110, an ink path unit 120, a first motion axis 130 and a second motion axis 140 arranged in parallel, a first printhead module 131 on the first motion axis 130 and a second printhead module 132 on the second motion axis 140. The first printhead module 131 includes a first printhead 1311 for spraying a first color and a second printhead 1312 for spraying a second color. The second printhead module 132 includes a third printhead 1313 for spraying a third color. The first printhead 1312 and the third printhead 1313 are respectively connected to the ink paths of different colors in the ink path unit. The printing motion platform 110 is used to carry the substrate and move along the third motion axis 150. The first motion axis 130 and the second motion axis 140 are perpendicular to the third motion axis 150. The printing motion platform 110 is used to carry the substrate and move along the third motion axis 150. The first motion axis 130 and the second motion axis 140 are perpendicular to the third motion axis 150. The first printhead module 131 and the second printhead module 132 are respectively connected to the ink paths of different colors in the ink path unit 120.

[0146] The control module 40 is used to determine the target printing scheme according to the target printing pattern. The target printing scheme includes the first motion trajectory of the first printhead 1311 and the second printhead 1312 in the first printhead module 131, the second motion trajectory of the third printhead 1313 in the second printhead module 132, the operating parameters of the printing motion platform 110, and the ink jet parameters of the ink path unit 120. The control printing module 10 performs inkjet printing operation according to the target printing scheme.

[0147] The control module 40 is also used to construct an overall pixel groove distribution model based on the repeating units of the pixel grooves on the substrate; to parse the first pattern to be printed by the first printhead module 131 and the second pattern to be printed by the second printhead module 132 based on the target printing pattern; to determine the first motion trajectory and the second motion trajectory based on the overall pixel groove distribution model, the first pattern and the second pattern; to determine the operating parameters of the printing motion platform 110 based on the first motion trajectory and the second motion trajectory; and to determine the inkjet parameters based on the first motion trajectory, the second motion trajectory and the operating parameters of the printing motion platform 110.

[0148] The control module 40 is also used to determine the coordinates of a preset target on the substrate 30; determine the angle between the substrate 30 and the third motion axis 150 based on the coordinates of the preset target; and control the printing motion platform 110 to rotate the substrate 30 based on the angle to complete the attitude calibration of the substrate 30.

[0149] The control module 40 is further configured to determine the target starting position of the first printhead 1311 and the target starting position of the third printhead 1313 in the target printing scheme; control the first printhead 1311 to move to the target starting position of the first printhead 1311, and control the third printhead 1313 to move to the target starting position of the third printhead 1313; control the first printhead to start inkjet printing based on the first motion trajectory; obtain a first motion distance, wherein the first motion distance is the distance between the current position of the printing motion platform 110 on the third motion axis 150 and the target starting position of the first printhead; control the second printhead 1312 to start inkjet printing when the first motion distance satisfies the first preset installation interval between the first printhead 1311 and the second printhead 1312; and control the third printhead 1313 to start inkjet printing based on the second motion trajectory when the first motion distance satisfies the second preset installation interval between the first printhead 1311 and the third printhead 1313.

[0150] The control module 40 is also used to determine the volume difference between the third color pixel slot 303 and the first color pixel slot 301 or the second color pixel slot 302; calculate the rotation angle of the third nozzle 1313 based on the volume difference; and control the third nozzle 1313 to rotate according to the rotation angle.

[0151] The control module 40 is also used to control the robotic arm to transfer the substrate 30 between the printing module 10 and the post-processing module.

[0152] This application provides an electronic device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform the inkjet printing method for the OLED substrate described in Embodiment 1 above.

[0153] The following is for reference. Figure 7 The diagram illustrates a structural schematic of an electronic device suitable for implementing embodiments of this application. The electronic devices in these embodiments may include, but are not limited to, mobile terminals such as mobile phones, laptops, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), in-vehicle terminals (e.g., in-vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. Figure 7 The electronic device shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0154] like Figure 7 As shown, the electronic device may include a processing unit 1001 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 1002 or a program loaded from a storage device 1003 into a random access memory (RAM) 1004. The RAM 1004 also stores various programs and data required for the operation of the electronic device. The processing unit 1001, ROM 1002, and RAM 1004 are interconnected via a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems can be connected to the I / O interface 1006: input devices 1007 including, for example, a touchscreen, touchpad, keyboard, mouse, image sensor, microphone, accelerometer, gyroscope, etc.; output devices 1008 including, for example, a liquid crystal display (LCD), speaker, vibrator, etc.; storage devices 1003 including, for example, magnetic tape, hard disk, etc.; and communication devices 1009. Communication device 1009 allows electronic devices to communicate wirelessly or wiredly with other devices to exchange data. While electronic devices with various systems are shown in the figures, it should be understood that implementation or possession of all the systems shown is not required. More or fewer systems may be implemented alternatively.

[0155] Specifically, according to the embodiments disclosed in this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments disclosed in this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device, or installed from storage device 1003, or installed from ROM 1002. When the computer program is executed by processing device 1001, it performs the functions defined in the methods of the embodiments disclosed in this application.

[0156] The electronic device provided in this application, employing the inkjet printing method for OLED substrates described in the above embodiments, can solve the technical problem. Compared with the prior art, the beneficial effects of the electronic device provided in this application are the same as those of the inkjet printing method for OLED substrates provided in the above embodiments, and other technical features of this electronic device are the same as those disclosed in the method of the previous embodiment, and will not be repeated here.

[0157] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0158] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0159] This application provides a computer-readable storage medium having computer-readable program instructions (i.e., a computer program) stored thereon, the computer-readable program instructions being used to execute the inkjet printing method for the OLED substrate in the above embodiments.

[0160] The computer-readable storage medium provided in this application may be, for example, a USB flash drive, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system, or device. The program code contained on the computer-readable storage medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0161] The aforementioned computer-readable storage medium may be included in an electronic device or may exist independently without being assembled into an electronic device.

[0162] The aforementioned computer-readable storage medium carries one or more programs that, when executed by an electronic device, cause the electronic device to: determine a target printing scheme based on a target printing pattern, wherein the target printing scheme includes a first motion trajectory of the first printhead module, a second motion trajectory of the second printhead module, the operating parameters, and the inkjet parameters of the ink path unit; and control the printing module to perform inkjet printing operations according to the target printing scheme.

[0163] Computer program code for performing the operations of this application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a Local Area Network (LAN) or a Wide Area Network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0164] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0165] The modules described in the embodiments of this application can be implemented in software or hardware. The names of the modules do not necessarily limit the functionality of the unit itself.

[0166] The readable storage medium provided in this application is a computer-readable storage medium that stores computer-readable program instructions (i.e., a computer program) for executing the inkjet printing method for the OLED substrate described above, which can solve the technical problems of poor printing accuracy and long printing cycle. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in this application are the same as the beneficial effects of the inkjet printing method for the OLED substrate provided in the above embodiments, and will not be repeated here.

[0167] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the inkjet printing method for an OLED substrate as described above.

[0168] The computer program product provided in this application can solve the technical problems of poor printing accuracy and long printing cycle. Compared with the prior art, the beneficial effects of the computer program product provided in this application are the same as those of the inkjet printing method for OLED substrates provided in the above embodiments, and will not be repeated here.

[0169] The above are merely optional embodiments of this application and do not limit the patent scope of this application. All equivalent structural transformations made based on the concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A method for inkjet printing an OLED substrate, characterized in that, The method is applied to an inkjet printing system for OLED substrates. The system includes a printing module, which comprises a printing motion platform, an ink path unit, a first motion axis and a second motion axis arranged in parallel, a first printhead module on the first motion axis, and a second printhead module on the second motion axis. The first printhead module includes a first printhead for ejecting a first color and a second printhead for ejecting a second color. The second printhead module includes a third printhead for ejecting a third color. The first printhead, the second printhead, and the third printhead are respectively connected to ink paths of different colors in the ink path unit. The printing motion platform carries the substrate and moves along the third motion axis. The first motion axis and the second motion axis are perpendicular to the third motion axis. The method includes the following steps: Based on the repeating units of the pixel slots on the substrate, an overall pixel slot distribution model is constructed; Based on the target printing pattern, the first pattern to be printed by the first printhead module and the second pattern to be printed by the second printhead module are analyzed. Based on the overall pixel slot distribution model, the first pattern, and the second pattern, determine the first motion trajectory of the first nozzle and the second nozzle in the first nozzle module, and the second motion trajectory of the third nozzle in the second nozzle module; Based on the first motion trajectory and the second motion trajectory, the operating parameters of the printing motion platform are determined; The inkjet parameters of the ink path unit are determined based on the first motion trajectory, the second motion trajectory, and the operating parameters of the printing motion platform. Determine a target printing scheme, wherein the target printing scheme includes the first motion trajectory, the second motion trajectory, the operating parameters, and the inkjet parameters; The printing module is controlled to perform inkjet printing operations according to the target printing scheme.

2. The inkjet printing method for an OLED substrate as described in claim 1, characterized in that, Prior to the step of determining the target printing scheme, the following is also included: Determine the coordinates of a preset target on the substrate; The angle between the substrate and the third motion axis is determined based on the coordinates of the preset target. Based on the included angle, the printing motion platform is controlled to rotate the substrate to complete the attitude calibration of the substrate.

3. The inkjet printing method for an OLED substrate as described in claim 1, characterized in that, The steps of controlling the printing module to perform inkjet printing operations according to the target printing scheme include: Determine the target starting position of the first printhead and the target starting position of the third printhead in the target printing scheme; Control the first nozzle to move to the target starting position of the first nozzle, and control the third nozzle to move to the target starting position of the third nozzle; Based on the first motion trajectory, control the first printhead to start inkjet printing; Obtain the first motion distance, wherein the first motion distance is the distance between the current position of the printing motion platform on the third motion axis and the target starting position of the first nozzle; When the first movement distance satisfies the first preset installation interval between the first printhead and the second printhead, the second printhead is controlled to start inkjet printing. When the first movement distance satisfies the second preset installation interval between the first printhead and the third printhead, the third printhead is controlled to start inkjet printing based on the second movement trajectory.

4. The inkjet printing method for an OLED substrate as described in claim 3, characterized in that, The pixel slots on the substrate include a first color pixel slot, a second color pixel slot, and a third color pixel slot. The volume of the third color pixel slot is greater than the volume of the second color pixel slot or the volume of the first color pixel slot. The volume of the second color pixel slot is the same as the volume of the first color pixel slot.

5. The inkjet printing method for an OLED substrate as described in claim 4, characterized in that, Prior to the step of determining the target printing scheme, the following is also included: Determine the volume difference between the third color pixel slot and the first color pixel slot or the second color pixel slot; The rotation angle of the third nozzle is calculated based on the volume difference; The third nozzle is controlled to rotate according to the rotation angle.

6. The inkjet printing method for an OLED substrate as described in claim 1, characterized in that, The inkjet printing system for the OLED substrate includes a robotic arm and a post-processing module, and the method further includes: The robotic arm is controlled to transfer the substrate between the printing module and the post-processing module.

7. An inkjet printing system for an OLED substrate, characterized in that, The system includes: The printing module includes a printing motion platform, an ink path unit, a first motion axis and a second motion axis arranged in parallel, a first printhead module on the first motion axis and a second printhead module on the second motion axis. The first printhead module includes a first printhead for spraying a first color and a second printhead for spraying a second color. The second printhead module includes a third printhead for spraying a third color. The first printhead, the second printhead and the third printhead are respectively connected to ink paths of different colors in the ink path unit. The printing motion platform is used to carry the substrate and move along the third motion axis. The first motion axis and the second motion axis are perpendicular to the third motion axis. The control module is configured to: construct an overall pixel slot distribution model based on the repeating units of the pixel slots on the substrate; parse the first pattern to be printed by the first printhead module and the second pattern to be printed by the second printhead module based on the target printing pattern; determine the first motion trajectory of the first printhead and the second printhead in the first printhead module and the second motion trajectory of the third printhead in the second printhead module based on the overall pixel slot distribution model, the first pattern, and the second pattern; determine the operating parameters of the printing motion platform based on the first motion trajectory and the second motion trajectory; determine the inkjet parameters of the ink path unit based on the first motion trajectory, the second motion trajectory, and the operating parameters of the printing motion platform; determine a target printing scheme, wherein the target printing scheme includes the first motion trajectory, the second motion trajectory, the operating parameters, and the inkjet parameters; and control the printing module to perform inkjet printing operations according to the target printing scheme.

8. An electronic device, characterized in that, The device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the inkjet printing method for an OLED substrate as described in any one of claims 1 to 6.

9. A storage medium, characterized in that, The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, it implements the steps of the inkjet printing method for the OLED substrate as described in any one of claims 1 to 6.

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