Ink droplet automatic calibration printing method and printing system

Abstract

The invention relates to an ink droplet automatic calibration printing method and system. The method comprises the steps that a database of the corresponding relation between parameter sets and droplet point diameters is established; the diameter of a standard liquid drop needing to be printed is obtained, and a parameter set is determined according to the database; the parameter group is adopted for printing; after each round of printing work of preset iteration times is carried out, the diameter of the last liquid drop which is formed by each round of printing operation and meets the use condition is measured; calculating whether a diameter difference value between the measured liquid drop diameter and the standard liquid drop diameter is in an error range or not so as to judge whether a parameter group needs to be iterated or not; if iteration is needed, at least one printing parameter in the parameter set is adjusted to iterate the parameter set; otherwise, printing the parameter group of the previous round; and after multiple rounds of printing operation, printing processing is completed. According to the method, the diameter of the actually printed liquid drop is measured regularly, the parameter set is iterated in time, it is guaranteed that the deviation of the diameter of the liquid drop formed in the printing process is within a reasonable range, and the printing quality is improved.

Description

Technical Field

[0001] The present application relates to the field of inkjet printing technology, and in particular to an automatic ink droplet calibration printing method and a printing system. Background Art

[0002] Electrofluid inkjet printing is a technology that uses electric field forces to control fluid ejection to precisely deposit tiny ink droplets onto a substrate. This technology combines the principles of fluid mechanics, electrodynamics, and materials science to achieve precise control and patterning of ink. In inkjet printing, ink is placed in a charged nozzle or printhead; when a sufficiently high voltage is applied, the ink forms a conical Taylor cone under the action of the electric field and forms a very fine jet at the tip; this jet can be precisely controlled to form the desired pattern on the substrate; when the voltage is removed or reduced, the jet stops and the ink droplets are deposited on the substrate.

[0003] In related art, during printing, various printing parameters are adjusted beforehand, and multiple test prints are performed. The droplet diameters from the test prints are then measured to determine a set of printing parameters corresponding to the desired droplet diameter. The set of printing parameters obtained from the test prints is then used for printing.

[0004] However, in the actual printing process, factors such as the needle state, printing environment, and the surface environment at different landing points vary. Therefore, when printing functional liquid at different locations, the diameters of the droplets formed by the functional liquid spraying at different printing points may vary. This can easily lead to a large deviation in the diameter of the droplets formed in subsequent printing from those formed in the early stages of printing, thus affecting print quality. Summary of the Invention

[0005] The embodiments of the present application provide an automatic ink droplet calibration printing method and printing system to solve the technical problem in the related art that as the printing process progresses, large deviations in droplet diameters are likely to occur, resulting in poor consistency in droplet diameters and affecting the printing process quality.

[0006] In a first aspect, a method for automatically calibrating ink droplets for printing is provided, comprising the following steps:

[0007] Establishing a database of correspondence between parameter groups and droplet diameters;

[0008] Obtain the standard droplet diameter required for printing and determine the parameter group according to the database;

[0009] Print using parameter groups;

[0010] After each printing operation with a preset number of iterations, the diameter of the last droplet formed in each printing operation that meets the use conditions is measured;

[0011] Calculate whether the diameter difference between the measured droplet diameter and the standard droplet diameter is within the error range to determine whether the parameter set needs to be iterated;

[0012] If iteration is required, adjust at least one printing parameter in the parameter group to iterate the parameter group; otherwise, print with the parameter group of the previous round;

[0013] After multiple rounds of printing operations, the printing process is completed.

[0014] In some embodiments, at least one printing parameter in the adjustment parameter group includes:

[0015] Determine the degree of influence of different printing parameters in the parameter group on the droplet diameter;

[0016] Preset multi-level threshold range, different threshold ranges correspond to different printing parameters;

[0017] According to the threshold range within which the diameter difference between the measured droplet diameter and the standard droplet diameter falls, the corresponding printing parameters are adjusted.

[0018] In some embodiments, the plurality of printing parameters in the parameter group include: amplitude voltage, frequency, duty cycle, and printing time;

[0019] The order of influence of multiple printing parameters on droplet diameter from weak to strong is: amplitude voltage, duty cycle, printing time, and frequency.

[0020] In some embodiments, it is characterized in that the number of iterations includes any integer from 1 to 20.

[0021] In some embodiments, measuring the diameter of the last droplet that meets the use conditions formed in each printing operation includes:

[0022] Measure the droplet diameters in reverse order of the printing of each droplet in each printing operation;

[0023] Calculating whether the difference between the measured droplet diameter and the standard droplet diameter is within a preset usable deviation range;

[0024] If the difference between the calculated droplet diameter and the standard droplet diameter is within the preset available deviation range, the droplet is calibrated as a droplet that meets the usage conditions; otherwise, the droplet is calibrated as a droplet that does not meet the usage conditions.

[0025] In some embodiments, if all droplets in a printing operation do not meet the usage conditions, the last droplet that meets the usage conditions in the previous printing operation is the last droplet that meets the usage conditions in the current printing operation.

[0026] In some embodiments, if three droplets that do not meet the usage conditions appear continuously, printing is stopped.

[0027] In some embodiments, before establishing a database of correspondences between parameter groups and droplet diameters, the method further includes:

[0028] Determine the functional liquid material to be printed, the aperture of the liquid outlet of the print head used, and the substrate material to be printed.

[0029] In some embodiments, the database for establishing the correspondence between the parameter group and the droplet diameter includes:

[0030] Using the control variable method, each printing parameter is increased step by step to form multiple parameter groups;

[0031] Use parameter groups to print dot matrix graphics;

[0032] Measuring the test droplet diameters of multiple droplets in the dot matrix pattern, and taking the average value of the test droplet diameters of the droplets within a preset diameter deviation range as the droplet diameter;

[0033] The droplet diameters under multiple parameter groups are recorded respectively, and a database of the correspondence between parameter groups and droplet diameters is established.

[0034] The beneficial effects of the technical solution provided by this application include:

[0035] The embodiment of the present application provides a method for automatic calibration of ink droplets. When printing, the parameter group required for printing is determined through the database to quickly determine the printing parameter group corresponding to the required printed droplets, thereby improving printing efficiency. During the printing process, by regularly monitoring the diameter of the actual printed droplets and timely adjusting the printing parameters in the parameter group, the parameter group is iterated according to the actual printing situation to achieve dynamic adjustment of the printed droplet diameter and timely correction of the droplet diameter. This avoids the influence of factors such as the needle state, printing environment, and surface environment at different landing points on printing during the printing process. It ensures that the diameter deviation of the droplets formed during the printing process is within a reasonable range, the consistency of the droplet diameter is better, and the printing quality is improved.

[0036] In a second aspect, an automatic ink droplet calibration printing system is provided, comprising:

[0037] A printing module, the printing module being used to print a functional liquid at a position to be printed;

[0038] A carrying module, the carrying module is used to support the substrate to be printed;

[0039] A control system is used to control the printing module and the carrier module to perform printing using the automatic ink droplet calibration printing method as described above.

[0040] Another embodiment of the present application provides an automatic ink droplet calibration printing system. Since the printing system operates according to the above-mentioned automatic ink droplet calibration printing method, the beneficial effects of the automatic ink droplet calibration printing system are consistent with the beneficial effects of the above-mentioned automatic ink droplet calibration printing method. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0042] Figure 1 This is a flowchart provided for an embodiment of the present application. DETAILED DESCRIPTION

[0043] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0044] The present invention provides an automatic droplet calibration printing method and system. This method periodically measures the diameter of the actual droplets printed during the printing process, uses this measurement as a basis for timely adjustment of printing parameters, and implements iteration of parameter sets to ensure that the deviation in the droplet diameter formed during the printing process is within a reasonable range, thereby ensuring printing consistency and improving print quality. This application addresses the technical problem in related technologies where large droplet diameter deviations can occur as the printing process progresses, resulting in poor droplet diameter consistency and impacting printing quality.

[0045] Reference Figure 1 , a method for automatic ink droplet calibration printing, comprising steps S100-700:

[0046] S100: Establishing a database of corresponding relationships between parameter groups and droplet diameters.

[0047] S200: Obtain the standard droplet diameter required for printing, and determine a parameter group according to a database.

[0048] S300, printing using the parameter group.

[0049] S400 , after each printing operation of a preset number of iterations, measuring the diameter of the last droplet that meets the use conditions formed in each printing operation.

[0050] S500: Calculate whether the diameter difference between the measured droplet diameter and the standard droplet diameter is within an error range to determine whether the parameter set needs to be iterated.

[0051] S600: If iteration is required, adjust at least one printing parameter in the parameter group to iterate the parameter group; otherwise, print with the parameter group of the previous round.

[0052] S700: After multiple rounds of printing operations, the printing process is completed.

[0053] With this setup, when printing, the parameter group required for printing is determined through the database, so that the printing parameter group corresponding to the required printing droplets can be quickly determined, thereby improving printing efficiency. During the printing process, by regularly monitoring the diameter of the actual printed droplets and timely adjusting the printing parameters in the parameter group, the parameter group is iterated according to the actual printing situation to achieve dynamic adjustment of the printed droplet diameter and timely correction of the droplet diameter. This avoids the influence of factors such as the needle state, printing environment, and the surface environment at different landing points on the printing process. It ensures that the diameter deviation of the droplets formed during the printing process is within a reasonable range, the consistency of the droplet diameter is better, and the printing quality is improved.

[0054] Wherein, step S100, establishing a database of correspondences between parameter groups and droplet diameters, specifically includes steps S110-S140.

[0055] S110 , using a control variable method, increasing each printing parameter step by step to form multiple parameter groups.

[0056] S120, printing a dot matrix graphic using the parameter group.

[0057] S130 , measuring the test droplet diameters of multiple droplets in the dot matrix pattern, and taking the average value of the test droplet diameters of the droplets within a preset diameter deviation range as the droplet diameter.

[0058] S140 , respectively recording the droplet diameters under multiple parameter groups, and building a database of corresponding relationships between parameter groups and droplet diameters.

[0059] This setup allows you to create multiple parameter groups by varying the printing parameters. Trial printing with these groups reveals the correspondence between these groups and droplet diameters. During actual printing, there's no need to adjust the printing parameters on-site; simply select the parameter group corresponding to the desired droplet diameter from the database to print with the desired droplet diameter, improving printing efficiency.

[0060] In step S110 , a control variable method is used to increase each printing parameter step by step to form multiple parameter groups.

[0061] Specifically, the plurality of printing parameters in the parameter group include: amplitude voltage, frequency, duty cycle and printing time. A control variable method is adopted to change each printing parameter step by step in sequence to obtain multiple parameter groups.

[0062] It is important to note that the printing parameters need to be adjusted step by step within the adjustment range of each printing parameter. The adjustment ranges of each printing parameter are: amplitude voltage 300-800V; frequency 10-50Hz; duty cycle 20%-50%; and printing time 50-500ms.

[0063] Furthermore, the strategy of step-by-step adjustment of each printing parameter includes: taking the adjustment range of the printing parameter as a whole and adjusting it by 1%-5% each time. In this embodiment, preferably, taking the adjustment range as a whole and adjusting it by 1% each time.

[0064] This setting refines the database by refining the changes in each printing parameter, ensuring that all droplet diameters required for printing are covered as much as possible.

[0065] In step S120, a dot pattern is printed using the parameter set.

[0066] Specifically, according to the parameter set, a dot pattern is printed, each dot pattern including at least 10 droplets.

[0067] In step S130 , the test droplet diameters of the plurality of droplets in the dot matrix pattern are measured, and the average value of the test droplet diameters of the droplets within a preset diameter deviation range is taken as the droplet diameter.

[0068] Specifically, the droplets in the test dot pattern are imaged, and the test droplet diameters are measured based on the imaging results. The average of all the test droplet diameters is taken as the median diameter, with a preset diameter deviation range of 80%-120% of the median diameter. The test droplet diameter data outside the diameter deviation range is removed, and the average of the remaining test droplet diameters is taken as the droplet diameter.

[0069] In this way, the parameter group corresponds to the droplet point diameter, which is obtained after processing multiple test droplet point diameter data. Therefore, the correspondence between the parameter group and the droplet point diameter is more reliable.

[0070] In step S140 , the droplet diameters under multiple parameter groups are recorded respectively, and a database of the corresponding relationship between the parameter groups and the droplet diameters is established.

[0071] Specifically, by matching the parameter group used in the test with the droplet diameter data obtained from the test printing, a database of the corresponding relationship between the parameter group and the droplet diameter can be established.

[0072] With this arrangement, in actual printing processing, the parameter set can be quickly determined according to the droplet diameter required for printing.

[0073] It should be noted that before establishing the database of the correspondence between parameter groups and droplet diameters, the following should also be included:

[0074] Determine the functional liquid material to be printed, the aperture of the liquid outlet of the print head used, and the substrate material to be printed.

[0075] That is, the databases of parameter groups and droplet diameters corresponding to various combinations of different functional liquid materials, the apertures of the liquid outlet holes of the print head used, and the substrate materials to be printed are different.

[0076] In this way, databases are established for different functional liquid materials, the apertures of the liquid outlets of the used print heads, the substrate materials to be printed, and their combinations, so as to improve the reliability and accuracy of the database.

[0077] In step S200, a standard droplet diameter required for printing is obtained, and a parameter group is determined according to a database.

[0078] Specifically, the required droplet diameter is known based on the printing requirements, and the parameter set can be determined in the database based on the standard droplet diameter, and the parameter set can be used for printing.

[0079] Wherein, in step S300, printing is performed using a parameter group.

[0080] Specifically, printing processing is performed according to the parameter group.

[0081] In step S400, after each printing operation with a preset number of iterations, the diameter of the last droplet that meets the use conditions formed in each printing operation is measured.

[0082] Specifically, each round of printing is performed for a preset number of iterations. The preset number of iterations includes any integer from 1 to 20. In this embodiment, preferably, the number of iterations includes 1, 2, 3, 4, or 5, that is, a printing operation for a continuous number of iterations is considered a printing round.

[0083] Furthermore, measuring the diameter of the last droplet that meets the use conditions formed in each round of printing operation includes:

[0084] The droplet diameters are measured in the reverse order of the printing of the droplets in each printing operation.

[0085] Calculate whether the difference between the measured droplet diameter and the standard droplet diameter is within a preset usable deviation range.

[0086] If the difference between the calculated droplet diameter and the standard droplet diameter is within the preset available deviation range, the droplet is calibrated as a droplet that meets the usage conditions; otherwise, the droplet is calibrated as a droplet that does not meet the usage conditions.

[0087] Specifically, the preset usable range includes less than 50% of the standard droplet diameter.

[0088] When measuring the droplet diameter, if the absolute value of the difference between the measured droplet diameter and the standard droplet diameter is greater than or equal to 50% of the standard droplet diameter, the droplet is identified as an abnormal droplet and calibrated as unusable, not meeting the conditions for use. Otherwise, the measured droplet is calibrated as usable and meets the conditions for use.

[0089] With this setup, the diameter of the printed droplets is measured after each printing cycle, ensuring printing continuity and efficiency. Furthermore, by measuring the diameter of the printed droplets in real time, changes in their diameter can be detected. This droplet diameter measurement data serves as the basis for determining whether and how the parameter set should be iterated.

[0090] In addition, when the number of iterations is small, it is possible that the droplets formed during the current printing cycle will not meet the use conditions after measurement. This is especially likely to occur when the number of iterations is less than 1.

[0091] Therefore, if all droplets in a printing operation do not meet the usage conditions, the last droplet that meets the usage conditions in the previous printing operation will be the last droplet that meets the usage conditions in the current printing operation.

[0092] It is understandable that when an abnormal droplet appears in this round, the last droplet that meets the usage conditions in the previous round is used as the last droplet that meets the usage conditions in this round, and this droplet is used as the data basis for whether to iterate the parameter group.

[0093] In addition, it should be noted that if three droplets that do not meet the usage conditions appear in succession, printing will stop. At this time, the diameter of the actual printed droplets is significantly different from the required droplet diameter, which does not meet the printing requirements.

[0094] In step S500, whether the diameter difference between the measured droplet diameter and the standard droplet diameter is within the error range is calculated to determine whether the parameter set needs to be iterated.

[0095] Specifically, the printed droplet diameter is measured through visual imaging, and the actual printed droplet diameter D is determined by formula 1. n Whether the difference with the standard droplet diameter D0 is within the error range is used to determine whether the parameter set needs to be iterated.

[0096] The margin of error is included within 5%.

[0097] Formula 1:

[0098] ∣D n -D0| / D0

[0099] Among them, D n is the actual droplet diameter; D0 is the standard droplet diameter. Where n is the number of prints.

[0100] In step S600, if iteration is required, at least one printing parameter in the parameter group is adjusted to iterate the parameter group; otherwise, printing is performed with the parameter group of the previous round.

[0101] Specifically, when the error range exceeds 5%, the parameter group needs to be iterated; when the error range is within 5%, the parameter group does not need to be iterated, and the previous parameter group is used for printing.

[0102] Specifically, the parameter group is iterated by adjusting at least one printing parameter.

[0103] Wherein, adjusting at least one printing parameter in the parameter group includes:

[0104] Determine the degree of influence of different printing parameters in the parameter group on the droplet diameter.

[0105] Multiple threshold ranges are preset, and different threshold ranges correspond to different printing parameters.

[0106] According to the threshold range within which the diameter difference between the measured droplet diameter and the standard droplet diameter falls, the corresponding printing parameters are adjusted.

[0107] Specifically, the degree of influence of different printing parameters on droplet diameter is determined by performing multiple print runs during the database building process and actual multiple print runs. In this embodiment, the multiple printing parameters are, in descending order of influence on droplet diameter, amplitude voltage, duty cycle, print time, and frequency.

[0108] Taking the minimum value of each printing parameter as the reference value, each change of 1% will result in the following changes in the diameter of the printed droplet:

[0109] For every 1% change in amplitude voltage, the printed droplet diameter changes by 15%-20%; for every 1% change in duty cycle, the printed droplet diameter changes by 5%-10%; for every 1% change in printing time, the printed droplet diameter changes by 3%-5%; for every 1% change in frequency, the printed droplet diameter changes by 0%-3%.

[0110] It should be noted that each printing parameter varies within its adjustable range.

[0111] Furthermore, multiple threshold ranges are divided according to Formula 1, and the threshold ranges include a first threshold range: greater than 5% and less than or equal to 8%; a second threshold range: greater than 8% and less than or equal to 12%; a third threshold range: greater than 12% and less than or equal to 20%; and a fourth threshold range: greater than 20% and less than 50%.

[0112] Correspondingly, when the actual printed droplet diameter D n When the error range of the difference between the actual droplet diameter D0 and the standard droplet diameter D0 is within the first threshold range, the frequency is adjusted. n When the error range of the difference between the actual droplet diameter D0 and the standard droplet diameter D0 is within the second threshold range, the printing time is adjusted. n When the error range of the difference between the actual droplet diameter D0 and the standard droplet diameter D0 is within the third threshold range, the duty cycle is adjusted. n When the error range of the difference from the standard droplet diameter D0 is within the fourth threshold range, the amplitude voltage is adjusted.

[0113] This setup divides the threshold range into different ranges, and based on the degree of influence of different printing parameters on droplet diameter, calculates the actual error range between the difference between the actual printed droplet diameter and the standard droplet diameter, and adjusts the printing parameters accordingly. This not only improves adjustment precision and accuracy, but also keeps the changes in each printing parameter at a minimum, avoiding fluctuations in print quality caused by excessive changes in printing parameters. It also improves the efficiency of parameter set iteration. Furthermore, by only changing a single parameter to iterate the parameter set, the iterative algorithm is simplified, the computational effort is reduced, and the system's operational stability is improved.

[0114] Among them, step S700, after multiple rounds of printing operations, the printing process is completed.

[0115] Specifically, during multiple rounds of printing, even if the number of printing times in the last round is less than the number of iterations, the printing process is still stopped.

[0116] The embodiment of the present application provides a method for automatic calibration of ink droplets. When printing, the parameter group required for printing is determined through the database to quickly determine the printing parameter group corresponding to the required printed droplets, thereby improving printing efficiency. During the printing process, by regularly monitoring the diameter of the actual printed droplets and timely adjusting the printing parameters in the parameter group, the parameter group is iterated according to the actual printing situation to achieve dynamic adjustment of the printed droplet diameter and timely correction of the droplet diameter. This avoids the influence of factors such as the needle state, printing environment, and surface environment at different landing points on printing during the printing process. It ensures that the diameter deviation of the droplets formed during the printing process is within a reasonable range, the consistency of the droplet diameter is better, and the printing quality is improved.

[0117] In a second aspect, an automatic ink droplet calibration printing system is provided, comprising:

[0118] A printing module, the printing module being used to print a functional liquid at a position to be printed;

[0119] A carrying module, the carrying module is used to support the substrate to be printed;

[0120] A control system is used to control the printing module and the carrier module to perform printing using the automatic ink droplet calibration printing method as described above.

[0121] Another embodiment of the present application provides an automatic ink droplet calibration printing system. Since the printing system operates according to the above-mentioned automatic ink droplet calibration printing method, the beneficial effects of the automatic ink droplet calibration printing system are consistent with the beneficial effects of the above-mentioned automatic ink droplet calibration printing method.

[0122] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0123] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0124] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A method for automatic ink droplet calibration printing, characterized in that: It includes the following steps: Establishing a database of correspondence between parameter groups and droplet diameters; Obtain the standard droplet diameter required for printing and determine the parameter group according to the database; Print using parameter groups; After each printing operation with a preset number of iterations, the diameter of the last droplet formed in each printing operation that meets the use conditions is measured; Calculate whether the diameter difference between the measured droplet diameter and the standard droplet diameter is within the error range to determine whether the parameter set needs to be iterated; If iteration is required, adjust at least one printing parameter in the parameter group to iterate the parameter group; otherwise, print with the parameter group of the previous round; After multiple rounds of printing operations, the printing process is completed.

2. The ink droplet automatic calibration printing method according to claim 1, characterized in that: The step of adjusting at least one printing parameter in the printing process parameter group includes: Determine the degree of influence of different printing parameters in the parameter group on the droplet diameter; Preset multi-level threshold range, different threshold ranges correspond to different printing parameters; According to the threshold range within which the diameter difference between the measured droplet diameter and the standard droplet diameter falls, the corresponding printing parameters are adjusted.

3. The ink droplet automatic calibration printing method according to claim 2, characterized in that: The plurality of printing parameters in the parameter group include: amplitude voltage, frequency, duty cycle and printing time; The order of influence of multiple printing parameters on droplet diameter from weak to strong is: amplitude voltage, duty cycle, printing time, and frequency.

4. The automatic ink droplet calibration printing method according to any one of claims 1 to 3, characterized in that: The number of iterations includes any integer from 1 to 20.

5. The ink droplet automatic calibration printing method according to claim 4, characterized in that: Measuring the diameter of the last droplet that meets the use conditions formed in each round of printing operation includes: Measure the droplet diameters in reverse order of the printing of each droplet in each printing operation; Calculating whether the difference between the measured droplet diameter and the standard droplet diameter is within a preset usable deviation range; If the difference between the calculated droplet diameter and the standard droplet diameter is within the preset available deviation range, the droplet is calibrated as a droplet that meets the usage conditions; otherwise, the droplet is calibrated as a droplet that does not meet the usage conditions.

6. The ink droplet automatic calibration printing method according to claim 5, characterized in that: If all the droplets in a round of printing operation do not meet the usage conditions, the last droplet that meets the usage conditions in the previous round of printing operation will be the last droplet that meets the usage conditions in the current round of printing operation.

7. The ink droplet automatic calibration printing method according to claim 5, characterized in that: If three droplets that do not meet the usage conditions appear continuously, printing will stop.

8. The ink droplet automatic calibration printing method according to claim 1, characterized in that: Before establishing a database of corresponding relationships between parameter groups and droplet diameters, the method further includes: Determine the functional liquid material to be printed, the aperture of the liquid outlet of the print head used, and the substrate material to be printed.

9. The ink droplet automatic calibration printing method according to claim 1, characterized in that: The database for establishing the corresponding relationship between the parameter group and the droplet diameter includes: Using the control variable method, each printing parameter is increased step by step to form multiple parameter groups; Use parameter groups to print dot matrix graphics; Measuring the test droplet diameters of multiple droplets in the dot matrix pattern, and taking the average value of the test droplet diameters of the droplets within a preset diameter deviation range as the droplet diameter; The droplet diameters under multiple parameter groups are recorded respectively, and a database of the correspondence between parameter groups and droplet diameters is established.

10. An automatic ink droplet calibration printing system, characterized in that: include: A printing module, the printing module being used to print a functional liquid at a position to be printed; A carrying module, the carrying module is used to support the substrate to be printed; A control system is used to control the printing module and the carrier module to perform printing according to the ink droplet automatic calibration printing method according to any one of claims 1 to 9.

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