Printing input parameter acquisition method based on liquid drop point precision control

Abstract

The invention discloses a printing input parameter obtaining method based on liquid drop point precision control, and belongs to the technical field of ink-jet printing, the method comprises the following steps: monitoring flow field data of a printing area in a trial printing process to obtain the current liquid drop flow speed of the jet printing area; judging whether the current droplet flow rate meets a first preset requirement or not, if not, correcting the current input parameter, and if yes, further judging whether the current precision parameter of trial printing meets a second preset requirement or not; if not, the current input parameters are corrected, and if yes, the corresponding current input parameters serve as the optimal input parameters to be used for subsequent formal printing. According to the method, the trial printing effect is monitored in real time, feedback adjustment is conducted according to the trial printing result, and finally the optimal input parameters are obtained and used for subsequent formal printing; according to the mode, through optimization of the printing parameters, the problem that the printing efficiency is low due to the fact that parameter adjustment depends on experience in traditional printing is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of inkjet printing, and more specifically, relates to a method for obtaining print input parameters based on droplet landing point accuracy control. Background Art

[0002] As an efficient and low-cost patterning technology, inkjet printing has been widely used in multiple fields such as printing, display, and electronic manufacturing. It can accurately deposit organic light-emitting materials on a large-area substrate to form the pixel structure of OLED. However, with the continuous improvement of application requirements, the accuracy and quality of droplet printing have become an important challenge for inkjet printing technology. Especially in the process of high-resolution and high-precision printing, the landing point accuracy of droplets directly affects the printing quality and product performance.

[0003] To solve the above problems, researchers in the field of inkjet printing technology have proposed a method for controlling the droplet landing point accuracy based on the flow field. Flow field control can effectively improve the flight trajectory of droplets and finely regulate the droplet landing point accuracy by adjusting the flow conditions in the inkjet area, such as flow rate, pressure, temperature, etc. However, there are generally two main problems in the existing flow field adjustment methods: on the one hand, the existing technology still lacks sufficient accuracy and flexibility in controlling input parameters and cannot be accurately adjusted according to different requirements of printing tasks; on the other hand, traditional methods for controlling droplet landing point accuracy usually rely on simple parameter calibration and single adjustment, and cannot fully consider the interaction of various complex factors, resulting in difficulty in ensuring the accurate positioning of droplets in actual applications.

[0004] Therefore, how to achieve fine control of droplet landing point accuracy through a more scientific flow field parameter adjustment method, and then solve the technical problem of low printing efficiency caused by parameter adjustment relying on experience in traditional printing. Summary of the Invention

[0005] In view of the above deficiencies or improvement requirements of the prior art, the present invention provides a method for obtaining print input parameters based on droplet landing point accuracy control, aiming to solve the technical problem of low printing efficiency caused by parameter adjustment relying on experience in traditional printing.

[0006] To achieve the above object, according to one aspect of the present invention, there is provided a method for obtaining print input parameters based on droplet landing point accuracy control, including:

[0007] S1: Perform a trial print using the set current input parameters;

[0008] S2: Monitor the flow field data of the printing area during the trial print to obtain the current droplet flow rate in the inkjet area;

[0009] S3: Determine whether the current droplet flow rate meets the first preset requirement; if not, correct the current input parameters and return to S1; if so, proceed to S4;

[0010] S4: After the trial printing is completed, obtain the current accuracy parameter of the droplet landing point under the current input parameters from the droplet landing point pictures obtained by the trial printing;

[0011] S5: Determine whether the current accuracy parameter meets the second preset requirement; if not, correct the current input parameters and return to S1; if so, use the corresponding current input parameters as the optimal input parameters for subsequent formal printing.

[0012] Further, the current input parameters include: environmental control parameters for controlling the operation of the printing device and droplet control parameters for controlling the landing flow rate; wherein, the droplet control parameters include: the initial droplet falling speed v D 。

[0013] Further, the environmental control parameters include: the FFU inlet flow rate v FFU , the substrate moving speed v Sub , the cavity temperature T and the cavity pressure P.

[0014] Further, S4 includes: S41: After the trial printing is completed, extract the actual droplet landing point information from the arrayed droplet landing point pictures; the actual droplet landing point information includes: the horizontal coordinate of the landing point, the vertical coordinate of the landing point, the adjacent landing point spacing, and the total number of landing points; S42: Calculate the current accuracy parameter of the droplet landing point under the current input parameters using the difference between the actual droplet landing point information and the theoretical droplet landing point information.

[0015] Further, the current accuracy parameter includes: the maximum offset parameter Δ max , and S42 includes: using the formula Δ max = max{|Δ i,j |} to calculate the maximum offset parameter Δ max ; wherein, |Δ i,j | represents the distance deviation between the actual landing point and the ideal landing point of the droplet in the i-th row and j-th column.

[0016] Further, the current accuracy parameter includes: the average offset parameter Δ avg , and S42 includes: using the formula to calculate the average offset parameter Δ avg ; wherein, N represents the total number of arrayed droplets, |Δ i,j | represents the distance deviation between the actual landing point and the ideal landing point of the droplet in the i-th row and j-th column, N row represents the number of rows of arrayed droplets, Ncol Indicates the number of rows of the arrayed droplets.

[0017] Furthermore, the current precision parameter includes: a spacing standard deviation parameter δ d , and the S42 includes: using the formula to calculate the spacing standard deviation parameter δ d ; where N d indicates the total number of spacings between the arrayed droplets, D k indicates the k-th droplet spacing, D s indicates the ideal spacing between adjacent droplets.

[0018] Furthermore, the S42 includes: using the formula δ d =(δ dx 2 +δ dy 2 ) 1 / 2 to calculate the spacing standard deviation parameter δ d ; where δ dx represents the standard deviation of the spacings between adjacent droplets in the horizontal direction, δ dy represents the standard deviation of the spacings between adjacent droplets in the vertical direction, N row indicates the number of rows of the arrayed droplets, N col indicates the number of columns of the arrayed droplets, represents the spacing between the droplet in the i-th row and j-th column and the droplet on its right, represents the spacing between the droplet in the i-th row and j-th column and the droplet below it, D sx and D sy respectively represent the ideal spacings between adjacent droplets in the x and y directions.

[0019] Furthermore, the current precision parameter includes: the number of defective droplets N def , and the S42 includes: using the formula to calculate the number of defective droplets N def ; where N row indicates the number of rows of the arrayed droplets, N col indicates the number of columns of the arrayed droplets Δ threshold represents the maximum deviation of the set droplet landing point precision, represents determining whether the landing point precision of the droplet in the i-th row and j-th column meets the preset maximum deviation of the landing point precision, and if it meets, it is 1, otherwise it is 0.

[0020] According to another aspect of the present invention, there is provided a device for obtaining printing input parameters based on the accuracy control of liquid drop landing points, including: a trial printing module, a detection module, a first judgment module, an acquisition module, and a second judgment module; wherein, the trial printing module is used to perform trial printing by using the set current input parameters; the detection module is used to monitor the flow field data of the printing area during the trial printing process to obtain the current liquid drop flow rate of the printing area; the first judgment module is used to judge whether the current liquid drop flow rate meets the first preset requirement; if not, the current input parameters are corrected and the corrected current input parameters are transmitted to the trial printing module; if so, it enters the acquisition module; the acquisition module is used to obtain the current accuracy parameter of the liquid drop landing point under the current input parameters from the liquid drop landing point picture obtained by the trial printing after the trial printing ends; the second judgment module is used to judge whether the current accuracy parameter meets the second preset requirement, if not, the current input parameters are corrected, and the current input parameters are corrected and the corrected current input parameters are transmitted to the trial printing module; if so, the corresponding current input parameters are used as the optimal input parameters for subsequent formal printing.

[0021] According to another aspect of the present invention, there is provided a printing device, including a memory and a processor, where the memory stores a computer program, and the processor executes the steps of the method when executing the computer program.

[0022] According to another aspect of the present invention, there is provided a computer-readable storage medium, on which a computer program is stored, and the computer program executes the steps of the method when executed by a processor.

[0023] Generally speaking, compared with the prior art through the above technical solutions conceived by the present invention, the following beneficial effects can be achieved:

[0024] (1) The present invention provides a method for obtaining printing input parameters based on the accuracy control of liquid drop landing points, monitors the flow field data of the printing area during the trial printing process to obtain the current liquid drop flow rate of the printing area; judges whether the current liquid drop flow rate meets the first preset requirement, if not, corrects the current input parameters, if so, further judges whether the current accuracy parameter corresponding to the liquid drop landing point picture at the end of the trial printing meets the second preset requirement; if not, corrects the current input parameters, if so, uses the corresponding current input parameters as the optimal input parameters for subsequent formal printing. The present invention obtains the optimal input parameters through real-time monitoring of the trial printing effect and feedback adjustment according to the trial printing results for subsequent formal printing; it can optimize the printing parameters, thereby improving the accuracy of liquid drop landing points during the formal printing process, and this method solves the problem of low printing efficiency caused by parameter adjustment relying on experience in traditional printing.

[0025] (2) The current input parameters described in this solution include: environmental control parameters for controlling the operation of the printing device and droplet control parameters for controlling the droplet flow rate at the landing point; this solution identifies the input parameters that have a greater impact on the droplet landing point accuracy, facilitating the feedback adjustment of the input parameters.

[0026] (3) The environmental control parameters described in this solution include: the FFU inlet flow rate v FFU , the substrate moving speed v Sub , the cavity temperature T, and the cavity pressure P; this solution identifies the environmental control parameters that have a greater impact on the droplet landing point accuracy, facilitating the feedback adjustment of the input parameters.

[0027] (4) In this solution, the steps of S4 are refined, including extracting the actual landing point information and calculating the accuracy parameters. This ensures the dataization and objectivity of the evaluation process and reduces human errors.

[0028] (5) This solution uses the formula to calculate the average offset parameter Δ avg ; this formula defines the landing point accuracy parameter: the average offset, which can reflect the overall landing point deviation level.

[0029] (6) This solution uses the formula to calculate the pitch standard deviation parameter δ d ; this formula defines the landing point accuracy parameter: the pitch standard deviation, which evaluates the distribution uniformity of the arrayed droplets.

[0030] (7) This solution uses the formula δ d = (δ dx 2 + δ dy 2 ) 1 / 2 to calculate the pitch standard deviation parameter δ d ; since the arrayed droplets have a horizontal pitch and a vertical pitch, the pitch standard deviation is decomposed into horizontal and vertical components, supporting multi-dimensional independent regulation.

[0031] (8) This solution proposes the number of defective droplets as a discretized quality index, and through the threshold {|Δ i,j | > Δ threshold}, the abnormal points with serious deviations can be quickly identified, and the calculation complexity is relatively low. Description of the Drawings

[0032] Figure 1 is a flowchart of the method for obtaining printing input parameters based on droplet landing point accuracy control provided in Embodiment 1 of the present invention;

[0033] Figure 2It is the process flow diagram of the printing input parameter acquisition method based on liquid drop landing point precision control provided in Embodiment 1 of the present invention;

[0034] Figure 3 It is the system flow diagram of the printing input parameter acquisition method based on liquid drop landing point precision control provided in Embodiment 1 of the present invention;

[0035] Figure 4a and 4b It is the schematic diagram of the arrayed liquid drop landing point precision parameters in the process flow diagram of the liquid drop landing point precision control method for inkjet printing based on the flow field provided in Embodiment 1 of the present invention;

[0036] Figure 5 It is the schematic structural diagram of a printing device provided in Embodiment 3 of the present invention.

[0037] In all the drawings, the same reference numerals are used to represent the same elements or structures, where:

[0038] 1 is the inkjet printing module, 11 is the inkjet printing nozzle structure, 2 is the motion module, 21 is the motion substrate, 3 is the vision module, 31 is the positioning camera, 32 is the first light source, 33 is the observation camera, 34 is the second light source, 35 is the scanning camera, 4 is the flow field detection module, 41 is the laser controller, 42 is the CCD camera, 5 is the system control module, 51 is the main controller, 52 is the liquid drop landing point precision predictor, 53 is the liquid drop landing point precision controller, 54 is the liquid drop landing point precision calculator, and 55 is the flow field flow rate calculator. Detailed implementation manners

[0039] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0040] Embodiment 1

[0041] The present invention provides a method for acquiring printing input parameters based on liquid drop landing point precision control. As Figure 1 shown, it includes: S1: performing a trial print using the set current input parameters; S2: monitoring the flow field data of the printing area during the trial print to obtain the current liquid drop flow rate in the inkjet printing area; S3: determining whether the current liquid drop flow rate meets the first preset requirement; if not, correcting the current input parameters and returning to S1; if so, entering S4; S4: after the trial print is completed, obtaining the current precision parameters of the liquid drop landing point under the current input parameters from the liquid drop landing point pictures obtained from the trial print.

[0042] S5: Determine whether the current precision parameter meets the second preset requirement. If not, correct the current input parameter and return to S1; if it meets the requirement, use the corresponding current input parameter as the optimal input parameter for subsequent formal printing.

[0043] Specifically, first, in the prediction stage, parameters such as the FFU inlet flow rate, substrate moving speed, droplet initial speed, temperature, and pressure can be input into the droplet landing point precision predictor to predict the droplet landing point precision parameter and obtain the effective range of each input parameter for subsequent trial printing. Next, in the initialization stage, modules such as the printing system, camera, and PIV particle velocimeter are initialized. Then, in the flow field observation stage, first move the inkjet printing system to the droplet observation position to observe the droplet. The observation camera takes pictures of the flying droplet and feeds the picture information back to the main controller in the system control module. The system calculates the initial speed of the droplet falling. Then, in the arrayed droplet printing stage and the flow field observation stage, move the inkjet printing system to the droplet printing position and input each parameter for droplet printing. At the same time, the CCD camera of the flow field detection module takes pictures of the flow field particle diagram in the inkjet printing area and feeds the picture information back to the main controller to calculate the flow rate of the flow field in the inkjet printing area. When the flow rate does not meet the requirement, correct each input parameter and repeat the operation until the flow rate of the flow field in the inkjet printing area meets the requirement. Then, move the printed substrate to the droplet landing point precision observation position. The scanning camera obtains the droplet landing point picture information and feeds it back to the droplet landing point precision calculator in the system control module to calculate the droplet landing point precision parameter. When the droplet landing point precision parameter does not meet the requirement, correct each input parameter and repeat the above operation until the droplet landing point precision meets the requirement. Finally, record the input parameters at this time for use in the subsequent formal printing process. Figure 2 and Figure 3 are respectively the process flow chart and system flow chart of the printing input parameter acquisition method based on droplet landing point precision control provided by the present invention. Correspondingly, the method includes the following steps.

[0044] Further, the flow rate of the flow field in the inkjet printing area is monitored by particle image velocimetry (PIV) technology, and the flow rate of the flow field in the inkjet printing area is measured and analyzed in real time through a particle velocimeter. Specifically, the PIV technology adds tiny tracking particles to the fluid and takes pictures of the displacement of the particles in the flow field over time through a high-speed imaging device to extract the flow rate information of the flow field in the inkjet printing area. Let the flow rate of each window be v i , there are a total of n windows, and the preset average flow rate is V a , when the flow rate satisfies the following formula, it can be considered that the average flow rate of the flow field in the inkjet printing area meets the requirement:

[0045] As an alternative implementation, the current input parameters include: environmental control parameters for controlling the operation of the printing device and droplet control parameters for controlling the droplet flow rate; among them, the droplet control parameters include: the initial droplet falling speed V D . Further, the environmental control parameters include: the FFU inlet flow rate v FFU , the substrate moving speed v Sub , the cavity temperature T, and the cavity pressure P.

[0046] Furthermore, when the flow field flow rate in the inkjet printing area does not meet the requirements, the adjustment steps Δv FFU , Δv Sub , Δv D , ΔT, and ΔP of each input parameter are respectively:

[0047]

[0048]

[0049] ΔT = T1(V w -V a );

[0050] ΔP = P1(V w -V a );

[0051] Among them, T1 and P1 respectively represent the calibration values of the FFU inlet flow rate, the substrate moving speed, the initial droplet speed, the temperature calibration value, and the pressure calibration value, used to correct the input parameters v FFU , v Sub , v D , T, and P.

[0052] When the droplet landing accuracy parameter does not meet the requirements, the adjustment steps Δv FFU , Δv Sub , Δv D , ΔT, and ΔP of each input parameter are respectively:

[0053]

[0054] ΔT = T a (Δ max -Δ max * ) + T b (Δ avg -Δ avg * ) + T c (δ d -δ d * ) + Td (N def -N def * );

[0055] ΔP = P a (Δ max -Δ max * ) + P b (Δ avg -Δ avg * ) + P c (δ d -δ d * ) + P d (N def -N def * );

[0056] Wherein, Δ max * 、Δ avg * 、δ d * 、N def * respectively represent the standard requirements of the process for the accuracy of the droplet landing points in the array during the actual printing process. represents the calibrated value of the FFU inlet flow rate, represents the calibrated value of the substrate moving speed, represents the calibrated value of the initial droplet velocity, T a 、T b 、T c 、T d represent the calibrated temperature values, P a 、P b 、P c 、P d represent the calibrated pressure values, used to correct the input parameters v FFU 、v Sub 、v D 、T、P.

[0057] As an optional implementation manner, S4 includes: S41: After the trial printing is completed, extract the actual droplet landing information from the picture of the droplet landing points in the array; the actual droplet landing information includes: the horizontal coordinate of the landing point, the vertical coordinate of the landing point, the adjacent landing point spacing, and the total number of landing points; S42: Calculate the current accuracy parameter of the droplet landing point under the current input parameters by using the difference between the actual droplet landing information and the theoretical droplet landing information.

[0058] Furthermore, the preset landing point accuracy requirement is: Wherein, Δmax * and Δ avg * and δ d * and N def * respectively represent the standard requirements of the process for the accuracy of the droplet landing points in the actual printing process. As an alternative implementation, the droplet landing point accuracy parameters under the current input parameters include: the maximum offset parameter Δ max , the average offset parameter Δ avg , the pitch standard deviation parameter δ d , and the number of defective droplets N def .

[0059] Among them, Δ max represents the maximum horizontal deviation between the landing point of each droplet in the droplet array and the corresponding target landing point; Δ avg represents the average horizontal deviation between all the droplet landing points in the droplet array and the target landing point; δ d represents the standard deviation of the distances between adjacent droplet landing points in the droplet array; N def represents the number of droplets in the droplet array whose landing point deviation exceeds the preset accuracy range.

[0060] Calculating the droplet landing point accuracy parameters of the droplet array includes the maximum offset parameter Δ max , the average offset parameter Δ avg , the pitch standard deviation parameter δ d , and the number of defective droplets N def ; Δ max represents the maximum horizontal deviation between the landing point of each droplet in the droplet array and the corresponding target landing point, as Figure 4b shown; Δ avg represents the average horizontal deviation between all the droplet landing points in the droplet array and the target landing point, as Figure 4b shown; δ d represents the standard deviation of the distances between adjacent droplet landing points in the droplet array, as Figure 4a shown; N def represents the number of droplets in the droplet array whose landing point deviation exceeds the preset accuracy range. Δ max , Δ avg , D sm and N def are calculated according to the following formulas respectively.

[0061] Furthermore, S42 includes: using the formula Δ max = max{|Δ i,j |} to calculate the maximum offset parameter Δ max ; where, |Δ i,j| represents the distance deviation between the actual landing point and the ideal landing point of the droplet in the i-th row and j-th column.

[0062] Further, S42 includes: using the formula to calculate the average offset parameter Δ avg ; where N represents the total number of arrayed droplets, |Δ i,j | represents the distance deviation between the actual landing point and the ideal landing point of the droplet in the i-th row and j-th column, N row represents the number of rows of the arrayed droplets, N col represents the number of columns of the arrayed droplets.

[0063] Further, S42 includes: using the formula to calculate the pitch standard deviation parameter δ d ; where N d represents the total number of pitches between the arrayed droplets, D k represents the k-th droplet pitch, D s represents the ideal pitch between adjacent droplets.

[0064] Further, S42 includes: using the formula δ d =(δ dx 2 +δ dy 2 ) 1 / 2 to calculate the pitch standard deviation parameter δ d ; where δ dx represents the standard deviation of the pitches between adjacent droplets in the horizontal direction, δ dy represents the standard deviation of the pitches between adjacent droplets in the vertical direction, N row represents the number of rows of the arrayed droplets, N col represents the number of columns of the arrayed droplets, represents the pitch between the droplet in the i-th row and j-th column and the droplet on its right, represents the pitch between the droplet in the i-th row and j-th column and the droplet below it, D sx and D sf respectively represent the ideal pitches between adjacent droplets in the x and y directions.

[0065] Further, the current precision parameter includes: the number of defective droplets N def , and S42 includes: using the formula to calculate the number of defective droplets N def ; where N row represents the number of rows of the arrayed droplets, N col represents the number of columns of the arrayed droplets Δ threshold represents the maximum deviation of the set droplet landing point precision, It represents judging whether the landing accuracy of the droplet at the i-th row and j-th column meets the maximum deviation of the preset landing accuracy. If it meets, it is 1; otherwise, it is 0.

[0066] Embodiment 2

[0067] The present invention provides a device for obtaining printing input parameters based on droplet landing accuracy control, including: a trial printing module, a detection module, a first judgment module, an acquisition module, and a second judgment module; wherein, the trial printing module is used to perform trial printing using the set current input parameters; the detection module is used to monitor the flow field data of the printing area during the trial printing to obtain the current droplet flow rate of the printing area; the first judgment module is used to judge whether the current droplet flow rate meets the first preset requirement; if it does not meet, the current input parameters are corrected, and the corrected current input parameters are transmitted to the trial printing module; if it meets, it enters the acquisition module; the acquisition module is used to obtain the current accuracy parameter of the droplet landing under the current input parameters from the droplet landing picture obtained by the trial printing after the trial printing ends; the second judgment module is used to judge whether the current accuracy parameter meets the second preset requirement. If it does not meet, the current input parameters are corrected, and the corrected current input parameters are transmitted to the trial printing module; if it meets, the corresponding current input parameters are used as the optimal input parameters for subsequent formal printing.

[0068] Embodiment 3

[0069] The present invention provides a printing device, including a memory and a processor. The memory stores a computer program, and the processor executes the steps of the method when executing the computer program.

[0070] Among them, as Figure 5 shown, the printing device includes an inkjet printing module 1, a motion module 2, a vision module 3, a flow field detection module 4, and a system control module 5. The inkjet printing module 1 includes a printing nozzle 11 for generating an array of droplets with a preset initial velocity and depositing them on the moving substrate 21.

[0071] The motion module 2 includes a printing nozzle 11, a moving substrate 21, a positioning camera 31, and a first light source 32. Among them, the printing nozzle 11, the positioning camera 31, and the first light source 32 form a nozzle printing positioning system. The main controller 51 can use the positioning camera 31 to move the printing nozzle 11 to the ideal printing position and perform printing operations. The moving substrate 22 can, through the main controller 51, perform array droplet printing according to the set substrate motion speed, and at the same time move the array of droplets after printing to the droplet landing accuracy observation area for observation.

[0072] The vision module 3 includes a positioning camera 31, a first light source 32, an observation camera 32, a second light source 34, and a scanning camera 35. The positioning camera 31 and the first light source 32 are located in the inkjet printing area and are used to position the printing position of the inkjet printing module 1. The observation camera 32 and the second light source 34 are located in the droplet observation area and are used to observe the flight state and initial velocity of the droplets, and at the same time obtain the flight image information of the droplets and feedback it to the main controller 51 in real time. The scanning camera 35 takes pictures and scans the arrayed droplets after printing, and feeds back the obtained arrayed droplet landing point accuracy information to the droplet landing point accuracy calculator 54.

[0073] The flow field detection module 4 includes a laser controller 41 and a CCD camera 42. The laser controller 41 emits laser light into the inkjet printing area to illuminate the PIV particles, and the CCD camera 42 captures the images of the fast-moving particles in the fluid and feeds the image information back to the flow field flow velocity calculator 55.

[0074] The system control module 5 includes a main controller 51, a droplet landing point accuracy predictor 52, a droplet landing point accuracy controller 53, a droplet landing point accuracy calculator 54, and a flow field flow velocity calculator 55. The main controller is used to control the initial velocity when generating droplets in the inkjet printing module 1; is used to control the inlet flow velocity of the FFU, the substrate moving speed, the temperature and pressure in the cavity during inkjet printing; is used to determine the position of the inkjet printing positioning system in the motion module 2 and control the movement of the substrate; is used to obtain the processing and judgment of various picture information in the vision module 3. The droplet landing point accuracy predictor 52 predicts the droplet landing point accuracy situation, obtains the effective range of each flow field parameter that can currently meet the requirements of the droplet landing point accuracy, and feeds this range back to the main controller 41. The droplet landing point accuracy controller 53 corrects each input parameter when the flow field flow velocity and the droplet landing point accuracy in the inkjet printing area do not reach the preset requirements. The droplet landing point accuracy calculator 54 extracts relevant landing position data from the arrayed droplet deposition pictures taken by the scanning camera 35, solves the arrayed droplet landing point parameters, and feeds the results back to the main controller 51. The flow field flow velocity calculator 55 extracts relevant flow field data from the PIV particle distribution images taken by the CCD camera 42, solves the flow field flow velocity in the inkjet printing area, and feeds the results back to the main controller 51.

[0075] Embodiment 4

[0076] The present invention provides a computer-readable storage medium, on which a computer program is stored, and the steps of the method when the computer program is executed by a processor.

[0077] Those skilled in the art can easily understand that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for obtaining printing input parameters based on droplet landing precision control, characterized in that: include: S1: Test printing using the current input parameters set; S2: monitoring the flow field data of the printing area during the trial printing process to obtain the current droplet flow rate of the printing area; S3: Determine whether the current droplet flow rate meets a first preset requirement; If not, the current input parameters are modified and the process returns to S1; if satisfied, the process proceeds to S4; S4: After the trial printing is finished, the current precision parameter of the droplet landing point under the current input parameters is obtained from the droplet landing point image obtained by the trial printing; S5: Determine whether the current precision parameter meets the second preset requirement. If not, modify the current input parameter and return to S1; if satisfied, use the corresponding current input parameter as the optimal input parameter for subsequent formal printing.

2. The method for obtaining printing input parameters based on droplet landing precision control according to claim 1, characterized in that: The current input parameters include: environmental control parameters for controlling the operation of the printing device and droplet control parameters for controlling the flow rate of the droplet; wherein the droplet control parameters include: the initial droplet velocity v D .

3. The method for obtaining printing input parameters based on droplet landing precision control according to claim 2, characterized in that: The environmental control parameters include: FFU inlet flow rate v FFU , substrate moving speed v Sub , cavity temperature T and cavity pressure P.

4. The method for obtaining printing input parameters based on droplet landing precision control according to claim 1, characterized in that: The S4 includes: S41: After the trial printing is completed, extracting actual droplet landing point information from the arrayed droplet landing point image; the actual droplet landing point information includes: landing point horizontal coordinates, landing point vertical coordinates, adjacent landing point spacing and the total number of landing points; S42: Calculate the current precision parameter of the droplet landing point under the current input parameters using the difference between the actual droplet landing point information and the theoretical droplet landing point information.

5. The method for obtaining printing input parameters based on droplet landing precision control according to claim 4, characterized in that: The current accuracy parameters include: average offset parameter Δ avg , the S42 comprises: Using the formula Calculate the average offset parameter Δ avg ; where N represents the total number of arrayed droplets, |Δ i,j | represents the distance deviation between the actual landing point of the droplet in the i-th row and the j-th column and the ideal landing point, N row represents the number of arrayed droplet rows, N col Represents the number of arrayed droplet columns.

6. The method for obtaining printing input parameters based on droplet landing precision control according to claim 4, characterized in that: The current accuracy parameters include: spacing standard deviation parameter δ d , the S42 comprises: Using the formula Calculate the spacing standard deviation parameter δ d ; Among them, N d represents the total number of spacings between arrayed droplets, D k represents the kth droplet spacing, D s represents the ideal spacing between adjacent droplets.

7. The method for obtaining printing input parameters based on droplet landing precision control according to claim 6, characterized in that: The S42 includes: using formula δ d =(δ dx 2 +δ dy 2 ) 1 / 2 Calculate the spacing standard deviation parameter δ d ; Among them, δ dx represents the standard deviation of the distance between adjacent droplets in the lateral direction, δ dy represents the standard deviation of the distance between adjacent droplets in the longitudinal direction, N row represents the number of arrayed droplet rows, N col represents the number of arrayed droplet columns, represents the distance between the droplet in row i and column j and the droplet to the right, represents the distance between the droplet in row i and column j and the droplet below, D sx and D sy represent the ideal spacing between adjacent droplets in the x and y directions, respectively.

8. The method for obtaining printing input parameters based on droplet landing precision control according to claim 4, characterized in that: The current precision parameters include: the number of defective droplets N def , the S42 comprises: Using the formula Calculate the number of defective droplets N def ; Among them, N row represents the number of arrayed droplet rows, N col Indicates the number of arrayed droplet columns Δ threshold Indicates the maximum deviation of the set droplet landing point accuracy. It indicates whether the landing accuracy of the droplet in the i-th row and j-th column meets the preset maximum landing accuracy deviation. If it meets the maximum landing accuracy deviation, it is 1, otherwise it is 0.

9. A printing input parameter acquisition device based on droplet landing precision control, characterized in that: include: A trial printing module, a detection module, a first judgment module, an acquisition module, and a second judgment module; The trial printing module is used to perform trial printing using the currently set input parameters; A detection module, used for monitoring the flow field data of the printing area during the trial printing process to obtain the current droplet flow rate of the printing area; A first judgment module, used to judge whether the current droplet flow rate meets a first preset requirement; If not, the current input parameters are corrected, and the corrected current input parameters are transmitted to the trial printing module; If satisfied, enter the acquisition module; An acquisition module, used for acquiring, after the trial printing is finished, current precision parameters of the droplet landing point under the current input parameters from the droplet landing point image obtained by the trial printing; A second judgment module is used to judge whether the current precision parameter meets the second preset requirement, and if not, to correct the current input parameter, and transmit the corrected current input parameter to the trial printing module; If the conditions are met, the corresponding current input parameters will be used as the optimal input parameters for subsequent formal printing.

10. A printing device, comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 8 are implemented.

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