CN117268738B - Nozzle detection method, device, equipment and storage medium - Google Patents

Nozzle detection method, device, equipment and storage medium Download PDF

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Publication number
CN117268738B
CN117268738B CN202311544427.3A CN202311544427A CN117268738B CN 117268738 B CN117268738 B CN 117268738B CN 202311544427 A CN202311544427 A CN 202311544427A CN 117268738 B CN117268738 B CN 117268738B
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drop
nozzle
ink
ink drop
determining
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CN117268738A (en
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唐井权
孙曌华
杨县委
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M13/00—Testing of machine parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/165—Preventing or detecting of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • B41J2/16579—Detection means therefor, e.g. for nozzle clogging

Abstract

The application discloses a nozzle detection method, a device, equipment and a storage medium, which belong to the technical field of nozzle detection, and the method comprises the following steps: controlling the row nozzle groups to print preset printing times at intervals along the column direction of the nozzle array in the corresponding printing area of the substrate, and obtaining an actual printing ink drop dot matrix chart; determining actual pixel coordinates of each ink drop relative to the bar positioning mark based on the actual printed ink drop dot matrix map; determining theoretical pixel coordinates of each ink drop in the actual printing ink drop dot matrix diagram relative to the strip-shaped positioning marks based on the azimuth relation between the printing area and the strip-shaped positioning marks; determining a landing deviation value between the actual pixel coordinates and the theoretical pixel coordinates of each ink drop; and detecting the nozzle based on the drop point deviation value. The application can improve the screening efficiency of the nozzle.

Description

Nozzle detection method, device, equipment and storage medium
Technical Field
The present disclosure relates to the field of nozzle detection technologies, and in particular, to a method, an apparatus, a device, and a storage medium for detecting a nozzle.
Background
An OLED (Organic Light-Emitting Diode) has been increasingly used as a current-type Light Emitting device in high-performance display devices, and the quality of the OLED product is closely related to the drop point of the inkjet ink drops, so before performing the inkjet printing operation, the nozzle of the inkjet head needs to be screened to screen out nozzles with poor blocking and flash effect.
However, the number of the spray heads used in the OLED inkjet printing is generally 200-2000, and it takes a long time to sequentially detect and screen the ink drops printed on each nozzle, for example, when the ink drop observer is used to observe about two thousand nozzles, it takes several hours, so that the nozzle screening efficiency is low.
Disclosure of Invention
The main object of the present application is to provide a method, an apparatus, a device and a storage medium for detecting a nozzle, which aim to solve the technical problem of low nozzle screening efficiency.
To achieve the above object, in a first aspect, the present application provides a nozzle detection method, including:
controlling the row nozzle groups to print preset printing times at intervals along the column direction of the nozzle array in the corresponding printing area of the substrate, and obtaining an actual printing ink drop dot matrix chart; the row nozzle group comprises a plurality of nozzles to be printed which are sequentially arranged at intervals along the row direction of the nozzle array, a preset number of nozzles are arranged between two adjacent nozzles to be printed at intervals in the nozzle array, and the substrate is provided with strip-shaped positioning marks extending along the transverse axis direction of a substrate coordinate system of the substrate;
Determining actual pixel coordinates of each ink drop relative to the bar positioning mark based on the actual printed ink drop dot matrix map;
determining theoretical pixel coordinates of each ink drop in the actual printing ink drop dot matrix diagram relative to the strip-shaped positioning marks based on the azimuth relation between the printing area and the strip-shaped positioning marks;
determining a landing deviation value between the actual pixel coordinates and the theoretical pixel coordinates of each ink drop;
and detecting the nozzle based on the drop point deviation value.
Optionally, the determining a landing deviation value between the actual pixel coordinates and the theoretical pixel coordinates of each ink droplet includes:
determining drop point pixel deviation values for each ink drop based on the actual pixel coordinates and the theoretical pixel coordinates of each ink drop;
determining the picture pixel size of the actual printing ink drop dot matrix image;
and obtaining the landing point deviation value based on the picture pixel size and the landing point pixel deviation value.
Optionally, the row direction of the nozzle array is parallel to the strip-shaped positioning marks on the substrate; the printing area has a theoretical printing starting point;
the determining, based on the azimuth relation between the printing area and the bar positioning mark, theoretical pixel coordinates of each ink drop in the actual printing ink drop dot matrix map relative to the bar positioning mark includes:
Performing bar positioning mark detection on the actually printed ink drop dot matrix graph to identify a bar positioning mark region;
fitting the strip-shaped positioning mark area to obtain a fitting straight line;
determining a linear deflection angle of the fitting straight line relative to the line of the adjacent edge; the adjacent edges are edge lines of the side where the strip-shaped positioning mark area is located among the 4 edges of the actually printed ink drop dot matrix image along the line;
constructing a picture plane coordinate system based on the theoretical printing starting point and the fitting straight line, and obtaining picture coordinates of each ink drop on the picture plane coordinate system;
based on a linear offset angle and a preset coordinate of the theoretical printing starting point in a substrate plane coordinate system of the substrate, obtaining a conversion relation between the picture plane coordinate system and the substrate plane coordinate system;
and converting the picture coordinates of the ink drops into the theoretical pixel coordinates of the ink drops in the substrate plane coordinate system based on the conversion relation.
Optionally, the determining, based on the actually printed dot matrix map, actual pixel coordinates of each ink droplet with respect to the bar positioning mark includes:
Determining the central pixel coordinates of each ink drop in the actual printing ink drop dot matrix chart;
the actual pixel coordinates of each ink drop are determined based on the center pixel coordinates of each ink drop.
Optionally, after the determining the actual pixel coordinates of each ink droplet based on the center pixel coordinates of each ink droplet, the method further includes:
judging whether printing ink drops are missed or not based on the actual printing ink drop dot matrix diagram;
if the missing printing ink drop exists, determining a missing printing nozzle based on the missing printing ink drop.
Optionally, the landing deviation value includes a first landing deviation value in the extending direction of the bar-shaped positioning mark, and a second landing deviation value in the extending direction perpendicular to the bar-shaped positioning mark, and the detecting the nozzle based on the landing deviation value includes:
determining first drop point deviation values and second drop point deviation values of all ink drops in the column ink drops according to the column ink drops of each column in the actual printing ink drop dot matrix diagram;
determining a positive maximum first drop point deviation value and a negative maximum first drop point deviation value from all first drop point deviation values of the ink drops in the array, and determining a positive maximum second drop point deviation value and a negative maximum first drop point deviation value from all second drop point deviation values of the ink drops in the array;
If the positive maximum first drop point deviation value, the negative maximum first drop point deviation value, the positive maximum second drop point deviation value and the negative maximum first drop point deviation value are not in the preset deviation threshold range, determining the nozzle to be printed corresponding to the ink drop row as a failed nozzle.
Optionally, after the detecting the nozzle based on the drop point deviation value, the method further includes:
determining an actual ink drop number of the column ink drops in the actual printing ink drop dot matrix map;
and if the actual ink drop quantity is not equal to the preset printing times, determining the nozzle to be printed corresponding to the ink drops in the row as a disqualified nozzle.
In a second aspect, the present application provides a nozzle detection apparatus comprising:
the printing module is used for controlling the row nozzle groups to print preset printing times at intervals along the column direction of the nozzle array in the corresponding printing area of the substrate, and acquiring an actual printing ink drop dot matrix chart; the row nozzle group comprises a plurality of nozzles to be printed which are sequentially arranged at intervals along the row direction of the nozzle array, a preset number of nozzles are arranged between two adjacent nozzles to be printed at intervals in the nozzle array, and the substrate is provided with strip-shaped positioning marks extending along the transverse axis direction of a substrate coordinate system of the substrate;
A first determining module for determining actual pixel coordinates of each ink drop relative to the bar positioning mark based on the actual printed ink drop dot matrix map;
the second determining module is used for determining theoretical pixel coordinates of each ink drop in the actual printing ink drop dot matrix graph relative to the strip-shaped positioning marks based on the azimuth relation between the printing area and the strip-shaped positioning marks;
a third determining module, configured to determine a landing deviation value between the actual pixel coordinate and the theoretical pixel coordinate of each ink droplet;
and the detection module is used for detecting the nozzle based on the drop point deviation value.
In a third aspect, the present application provides a nozzle detection apparatus comprising: a processor, a memory and a nozzle detection program stored in the memory, which when executed by the processor, performs the steps of the nozzle detection method as described in any one of the above.
In a fourth aspect, the present application provides a computer-readable storage medium having stored thereon a nozzle detection program which, when executed by a processor, implements the nozzle detection method as described in any one of the above.
According to the nozzle detection method, the preset printing times are printed at intervals along the column direction of the nozzle array in the corresponding printing area of the substrate by controlling the row nozzle groups, and an actual printing ink drop dot matrix diagram is obtained; the row nozzle group comprises a plurality of nozzles to be printed which are sequentially arranged at intervals along the column direction of a nozzle array, a preset number of nozzles are arranged between two adjacent nozzles to be printed at intervals in the nozzle array, and the substrate is provided with strip-shaped positioning marks extending along the transverse axis direction of a substrate coordinate system of the substrate; determining actual pixel coordinates of each ink drop relative to the bar positioning mark based on the actual printed ink drop dot matrix map; determining theoretical pixel coordinates of each ink drop in the actual printing ink drop dot matrix diagram relative to the strip-shaped positioning marks based on the azimuth relation between the printing area and the strip-shaped positioning marks; determining a landing deviation value between the actual pixel coordinates and the theoretical pixel coordinates of each ink drop; and detecting the nozzle based on the drop point deviation value, so that the nozzle screening efficiency is improved.
Compared with the prior art, the method and the device for detecting and screening the ink drop data of each nozzle sequentially detect and screen the ink drop data of each nozzle, and the method and the device for detecting the ink drop data of each nozzle take the ink drop dot array printed by all the nozzles in the row nozzle group as a whole, detect the nozzles by calculating the drop deviation values of all the ink drops in the ink drop dot array, do not need to photograph the ink drops printed by the single nozzles, reduce photographing time and improve screening efficiency of the nozzles.
Drawings
FIG. 1 is a schematic view of a nozzle detection apparatus according to the present application;
FIG. 2 is a schematic flow chart of a first embodiment of a nozzle detection method according to the present application;
FIG. 3 is a schematic diagram of a block diagram of a nozzle detection system of the present application;
FIG. 4 is a schematic diagram of the positional relationship between a substrate and a bar-shaped positioning mark;
FIG. 5 is a schematic illustration of a primary print zone corresponding to each nozzle sub-array in the present application;
FIG. 6 is a schematic illustration of a print zone corresponding to each row of nozzle groups in the present application;
FIG. 7 is a schematic illustration of missing printed ink droplets in an actual printed ink droplet dot matrix diagram according to the present application;
FIG. 8 is a schematic view of adjacent edges along the line of a dot matrix plot for actual printing of ink according to the present application;
FIG. 9 is a schematic illustration of an actual printed drop array of the present application;
fig. 10 is an enlarged schematic view of the actual ink drop point S in fig. 9;
fig. 11 is a schematic functional block diagram of a first embodiment of a nozzle detection device according to the present application.
The realization, functional characteristics and advantages of the present application will be further described with reference to the embodiments, referring to the attached drawings.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
The nozzle screening of the spray head is an important part of the inkjet printing of the OLED, and is related to printing quality and uniformity, so before performing the inkjet printing operation, the nozzle of the spray head needs to be screened to screen out the nozzle with poor blocking and flash effect.
In the prior art, after a specific test printing dot matrix pattern is printed by using nozzles, printing pictures of single nozzles are sequentially shot and subjected to image processing, scattered or less nozzles are screened according to the number of actual landing points in a visual field, then compared with the test printing pattern, deviation data of the landing points of ink drops of all the nozzles are calculated, unqualified nozzles are screened according to a set threshold value, and the nozzles without ink drops, with flying ink drops and with too large or too small ink drop volumes are forbidden, so that the screening of the nozzles is completed. Or using an ink drop observer to observe and measure the ink drop data of all the nozzles of the spray head in sequence, and then screening the nozzles.
However, the number of nozzles used in OLED inkjet printing is generally 200 to 2000, and it takes a long time to sequentially detect and screen ink droplets printed on each nozzle. If a single nozzle print picture is taken and the deviation of the printed ink drops of the single nozzle is determined based on the print picture, or when the ink drop observer is used for observing nearly two thousand nozzles, it takes several hours, so that the nozzle screening efficiency is low.
The application provides a solution, makes in the prior art, detects the screening in proper order to the printing ink droplet data of every nozzle, and this application regards the ink droplet lattice that all nozzles were printed in the row nozzle group as a whole, detects the nozzle through calculating the landing deviation value of all ink droplets in the ink droplet lattice, does not need to take a picture the ink droplet that single nozzle was printed, has reduced the shooting duration to the screening efficiency of nozzle has been improved.
Referring to fig. 1, fig. 1 is a schematic structural view of a nozzle detection apparatus of the present application.
As shown in fig. 1, the nozzle detection apparatus may include: a processor 1001, such as a central processing unit (Central Processing Unit, CPU), a communication bus 1002, a user interface 1003, a network interface 1004, a memory 1005. Wherein the communication bus 1002 is used to enable connected communication between these components. The user interface 1003 may include a Display, an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may further include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a WIreless interface (e.g., a WIreless-FIdelity (WI-FI) interface). The Memory 1005 may be a high-speed random access Memory (Random Access Memory, RAM) Memory or a stable nonvolatile Memory (NVM), such as a disk Memory. The memory 1005 may also optionally be a storage device separate from the processor 1001 described above.
It will be appreciated by those skilled in the art that the configuration shown in fig. 1 is not limiting of the nozzle detection apparatus and may include more or fewer components than shown, or may combine certain components, or a different arrangement of components.
As shown in fig. 1, an operating system, a data storage module, a network communication module, a user interface module, and a nozzle detection program may be included in the memory 1005 as one type of storage medium.
In the nozzle detection apparatus shown in fig. 1, the network interface 1004 is mainly used for data communication with a network server; the user interface 1003 is mainly used for data interaction with a user; the processor 1001 and the memory 1005 in the nozzle detection apparatus of the present application may be provided in the nozzle detection apparatus, and the nozzle detection apparatus calls the nozzle detection program stored in the memory 1005 through the processor 1001 and executes the nozzle detection method provided in the embodiment of the present application.
Based on the above-described hardware structure of the nozzle detection apparatus, but not limited to the above-described hardware structure, the present application provides a first embodiment of a nozzle detection method. Referring to fig. 2, fig. 2 shows a schematic flow chart of a first embodiment of the nozzle detection method of the present application.
It should be noted that although a logical order is depicted in the flowchart, in some cases the steps depicted or described may be performed in a different order than presented herein.
In this embodiment, the method for detecting a nozzle includes:
And S10, controlling the row nozzle groups to print preset printing times at intervals along the column direction of the nozzle array in the corresponding printing area of the substrate, and obtaining an actual printing ink drop dot matrix chart.
The row nozzle group comprises a plurality of nozzles to be printed which are sequentially arranged at intervals along the row direction of the nozzle array, a preset number of nozzles are arranged between two adjacent nozzles to be printed at intervals in the nozzle array, and the substrate is provided with strip-shaped positioning marks extending along the transverse axis direction of the substrate coordinate system of the substrate.
The main body of the nozzle detection method is a nozzle detection device, a nozzle detection program is stored in the nozzle detection device, and when the nozzle detection device executes the nozzle detection program, the nozzle detection method is executed.
In this embodiment, the preset number of printing may be the number of printing lines set by the user according to the actual demand.
Referring to fig. 3, fig. 3 is a schematic diagram of a structure diagram of a nozzle detection system, which is divided into four parts including a print head 201, a substrate 202, an air-floating plate micro-platform 203, and a CCD (Charge-coupled Device) camera module 204. The CCD camera module 204 is connected to the micro-platform 203 of the air-floating plate, and after the printing nozzle 201 is controlled to print ink drops on the substrate 202, the CCD camera module 204 and the micro-platform 203 of the air-floating plate can be moved to shoot the dot matrix of the ink drops actually printed, so as to obtain the dot matrix map of the ink drops actually printed. As shown in fig. 4, a metal bar, that is, a bar-shaped positioning mark 2021, for determining a printing start position of the line nozzle group is provided at one end portion of the substrate 202, and the bar-shaped positioning mark extends in a horizontal axis direction of the substrate coordinate system, that is, in an x axis.
Specifically, the nozzle array is now divided into a plurality of nozzle sub-arrays prior to controlling the nozzles for printing. Specifically, in the first nozzle subarray, in the row direction of the nozzle array, with the first row of nozzles as a starting point, in order to prevent ink drops from adhering when adjacent rows of nozzles are printed, a row of nozzles are selected and executed multiple times by a certain number of nozzle rows in sequence, and the obtained multiple rows of nozzles are selected into the nozzle subarray. Then, the second nozzle sub-array, also in the row direction of the nozzle array, uses the second row of nozzles as a starting point, and in order to prevent the ink drops from adhering when the adjacent rows of nozzles print, selects one row of nozzles from a certain number of nozzle rows in turn and executes the same a plurality of times, and selects the obtained multiple rows of nozzles into the second nozzle sub-array. Thus, the number of nozzle sub-arrays obtained depends on the number of intervals described above.
For example, the nozzles may be grouped according to a preset number of intervals in order to avoid adhesion of ink droplets during printing of adjacent rows of nozzles, for example, the first group of nozzle sub-arrays includes the 1 st row of nozzles, the 11 th row of nozzles, the 21 st row of nozzles, … …, the 91 st row of nozzles, and the second group of nozzle sub-arrays includes the 2 nd row of nozzles, the 12 th row of nozzles, the 22 nd row of nozzles, … …, and the 92 th row of nozzles. The number of nozzle rows spaced apart by a certain number in this example is 10, and of course, the preset number of intervals may be set according to actual needs, which is not limited in this embodiment.
It will be appreciated that if the nozzle sub-arrays are controlled to print a preset number of prints at intervals along the column direction of the nozzle arrays, ink droplets printed by adjacent rows of nozzles in the same column may stick or overlap. Therefore, to avoid the above situation, further, after the nozzle sub-arrays are obtained, the nozzle sub-arrays are grouped in the column direction to obtain a plurality of row nozzle groups. For example, the nozzle array is a 4×100 nozzle array, where 4 is the number of rows of the nozzle array, 100 is the number of columns of the nozzle array, and after the nozzles are divided into ten groups of nozzle sub-arrays according to the above manner, the nozzle sub-arrays are further grouped according to the number of rows of the nozzle array. For example, the first row of all nozzles in the first nozzle sub-array is taken as a row of nozzle groups, the second row of all nozzles is taken as a row of nozzle groups, the third row of all nozzles is taken as a row of nozzle groups, and so on.
Further, as shown in fig. 5, after grouping the nozzles to obtain the row nozzle groups, the print area of each group of row nozzle groups is determined on the substrate, that is, the surface of the substrate is uniformly divided into a plurality of first-stage print areas along the extending direction of the strip-shaped positioning marks according to the number of nozzle sub-arrays, and the extending direction of each first-stage print area is perpendicular to the strip-shaped positioning marks. Then, after the first-stage printing area corresponding to each nozzle subarray is obtained, the first-stage printing area is uniformly divided along the extending direction of the first-stage printing area according to the number of the row nozzle groups in each nozzle subarray, so as to obtain the printing area corresponding to each row nozzle group, as shown in fig. 6.
Specifically, after determining the print area of each group of row nozzle groups, in order to effectively detect the quality, uniformity and stability of ink drop printing in the visual field, the number of print rows of the row nozzle groups, that is, the number of print rows of the row nozzle groups, i.e., the number of print rows of the row nozzle groups, is determined, for example, the number of print rows of each group of row nozzle groups is controlled to print 20, that is, the preset number of print rows r=20. After printing, controlling the camera to shoot each printing area to obtain an actual printing ink drop dot matrix diagram of each printing area with the ink drop dot matrix of R multiplied by C, wherein C represents the number of columns of the ink drop dot matrix in the actual printing ink drop dot matrix diagram, namely, the number of nozzles in the row nozzle group. In addition, the serial numbers of the nozzles for printing the ink drops in the first column and the ink drops in the last column are recorded in the name of each dot matrix picture of the ink drops actually printed, so that the nozzles with poor blocking and flash effect can be quickly determined in the follow-up process.
And step S20, determining the actual pixel coordinates of each ink drop relative to the strip-shaped positioning mark based on the actual printing ink drop dot matrix diagram.
In this embodiment, in determining the actual pixel coordinates of each ink droplet with respect to the bar-shaped positioning mark based on the actually printed ink droplet dot pattern, further, as an optional implementation, step S20 specifically includes:
Step S201, determining the central pixel coordinates of each ink droplet in the actual print ink droplet dot matrix chart.
Step S202, determining the actual pixel coordinates of each ink droplet based on the center pixel coordinates of each ink droplet.
It should be noted that, in order to reduce the printing error during the printing process, the printing area has a theoretical printing start point, so that the row nozzle group may perform the alignment operation according to the theoretical printing start point before the corresponding printing area of the substrate starts printing. Correspondingly, after each printing area is printed, each printing area is photographed to obtain an actual printing ink drop dot matrix diagram, and the actual printing ink drop dot matrix diagram can contain a theoretical printing starting point.
Specifically, after the actual print ink drop dot matrix image is obtained, preprocessing is performed on each actual print ink drop dot matrix image, namely, graying processing, brightness adjustment processing and contrast adjustment processing are performed to highlight the characteristics of ink drops, and further, gaussian filtering is performed on the preprocessed actual print ink drop dot matrix image to remove noise points.
Further, after the operation, the ink drop characteristics in the ink drop dot matrix image which is actually printed are extracted by utilizing a SimpleBlobdetector spot detection algorithm, and the ink drops in the ink drop dot matrix image which is actually printed are detected and screened by setting parameters such as the pixel area size, the inertia ratio, the roundness and the like of the spots.
After the ink drops in the actually printed ink drop dot matrix diagram are screened, the actually printed ink drop dot matrix diagram is subjected to strip-shaped positioning mark detection so as to identify a strip-shaped positioning mark region 5, and fitting processing is performed on the strip-shaped positioning mark region 5 to obtain a fitting straight line. After the fitting straight line is obtained, a theoretical printing starting point P (x) is determined from the practical printing ink drop dot matrix diagram 0 ，y 0 ) In theory, print the starting point P (x 0 ，y 0 ) And taking the fitting straight line as an origin, and constructing a picture plane coordinate system by taking the fitting straight line as an X axis. In the picture plane coordinate system, the positive X-axis direction is from left to right, and the positive Y-axis direction is from bottom to top. After the picture plane coordinate system is constructed, the center pixel coordinate of each ink droplet in the picture plane coordinate system can be obtained. After obtaining the central pixel coordinates of each ink drop, reconstructing a KeyPoint type container Points to store the central pixel coordinates of each ink drop。
Further, after the central pixel coordinates of each ink drop are obtained, from the 4 edge lines of the actually printed ink drop dot matrix graph, the edge line of the side edge where the strip-shaped positioning mark area 5 is located is taken as the line of the adjacent edge, and the linear deflection angle between the fitting straight line and the line of the adjacent edge is determined. After determining the linear deflection angle, determining a conversion relation between a picture plane coordinate system and a substrate plane coordinate system according to the linear deflection angle and a preset coordinate of a theoretical printing starting point in the substrate plane coordinate system of the substrate, determining a coordinate conversion formula, and finally converting the picture coordinate system of each ink drop into an actual pixel coordinate of each ink drop in the substrate plane coordinate system by using the coordinate conversion formula so as to obtain the actual pixel coordinate of each ink drop.
It should be noted that, the ink droplets obtained based on the above detection method are arranged randomly, and therefore, the ink droplets are also ordered.
Specifically, based on the actually printed dot pattern, the position P (x 0 ，y 0 ). It can be appreciated that since different printing areas are printed by different row nozzle groups, and after printing is completed, the camera and the substrate micro-stage need to be continuously moved so as to shoot the printing ink drop dot array of each row nozzle group, so as to obtain an actual printing ink drop dot array map corresponding to each row nozzle group. However, in the actual shooting process, since the camera and the substrate micro-stage need to be continuously moved, a large mechanical error is accumulated due to excessive movement times, and further ink drops printed by a normal nozzle at the back have large deviation, so that a false screen occurs. Therefore, in order to reduce the influence of the accumulated errors of the movements of the camera and the substrate moving stage on the drop point, it is necessary to determine a theoretical printing start point for each printing area before controlling the row nozzle groups for printing, so that alignment is performed by the theoretical printing start point before starting printing for each row nozzle group. After determining the theoretical printing start point P (x 0 ，y 0 ) Then, according to the first preset deviation range, determining the position P of the actual printing start point of the actual printing ink drop dot matrix diagram （0,0） (x, y). If the actual deviation is not screened in the preset deviation rangeAnd marking the actual printing starting point as a missing printing point, and determining a printing nozzle corresponding to the missing printing point. If the actual printing start point P is screened within the preset deviation range （0,0） After (x, y), placing the actual printing ink drop dot matrix graph on the substrate, wherein the direction of the actual printing ink drop dot matrix graph from left to right is parallel to the strip-shaped positioning marks on the substrate, the direction of the actual printing ink drop dot matrix graph from top to bottom is perpendicular to the strip-shaped positioning marks on the substrate, and according to the actual printing starting point P （0,0） (x, y) sequentially screening the first row of ink drops at the bottom of the ink drop dot matrix from left to right. After all the ink drops in the first row are determined, each ink drop in the first row is taken as a starting Point, ink drops in the j-th row are screened upwards according to a second preset deviation range, so that an actual printing ink drop dot array is obtained, and the ink drops in the actual printing ink drop dot array are sequentially stored in a two-dimensional container set of a Point type.
It will be appreciated that during actual printing, when the nozzles are blocked, the nozzles cannot eject ink droplets, so further, in order to quickly determine the nozzles incapable of ejecting ink, as an alternative embodiment, after step S20, the method further includes:
And S21, judging whether printing ink drops are missed or not based on the actual printing ink drop dot matrix diagram.
And S22, if the printing-missing ink drop exists, determining a printing-missing nozzle based on the printing-missing ink drop.
Specifically, based on the above steps, after all the ink droplets in the first row are determined, the ink droplets in the first row may be identified, and whether there is a blocked nozzle is determined according to the actual separation distance between two adjacent ink droplets.
For example, after determining all the ink droplets in the first row, calculating the actual distance between two adjacent ink droplets according to the actual pixel coordinates of each ink droplet in the first row, as shown in fig. 7, the solid line circle represents the printing ink droplet dot, the dotted line circle represents the missing printing ink droplet dot a, when missing printing ink droplets, two ink droplets on both sides of the missing printing ink droplet are adjacent ink droplets at this time, and it is understood that in the actual printing process, on the premise that the nozzle accuracy meets the requirement, the actual distance between two ink droplets printed by two adjacent nozzles is within the distance range, and when the nozzles are blocked, the actual distance between two adjacent nozzles is larger than the actual distance between two ink droplets which are normally adjacent. Therefore, when the actual separation distance between the adjacent two nozzles is larger than the actual separation distance between the normal adjacent two ink droplets, it is determined that there is a missing print ink droplet at this time, and the missing print nozzle is determined based on the missing print ink droplet.
Or, as another alternative embodiment, after determining all the ink droplets of the first row, further determining the number of ink droplets of the first row, determining whether the number of ink droplets of the first row is equal to the number of nozzles in the row nozzle group, and when the number of ink droplets is not equal to the number of nozzles, missing printing ink droplets exists. After determining that there is a missing print ink drop, a missing print nozzle is determined from the missing print ink drop.
And step S30, determining theoretical pixel coordinates of each ink drop in the actual printing ink drop dot matrix graph relative to the strip-shaped positioning marks based on the azimuth relation between the printing area and the strip-shaped positioning marks.
It will be appreciated that, after determining the actual pixel coordinates of the ink drops, to reduce the amount of computation, it is necessary to determine the theoretical pixel coordinates of each ink drop in the actual printed ink drop dot matrix map relative to the bar positioning marks. Thus, further, as an alternative embodiment, step S30 specifically includes:
in this embodiment, the row direction of the nozzle array is parallel to the bar-shaped positioning marks on the substrate; the print zone has a theoretical print starting point.
And step S301, detecting the strip-shaped positioning marks on the actually printed ink drop dot matrix graph so as to identify the strip-shaped positioning mark areas.
And step S302, fitting the strip-shaped positioning mark area to obtain a fitting straight line.
Step S303, determining a linear deflection angle of the fitting straight line relative to the line of the adjacent edge; and the adjacent edges are edge lines of the side where the strip-shaped positioning mark area is located in the line of 4 edges of the actually printed ink drop dot matrix image.
And step S304, constructing a picture plane coordinate system based on the theoretical printing starting point and the fitting straight line, and obtaining the picture coordinates of each ink drop on the picture plane coordinate system.
Step S305, obtaining a conversion relationship between the picture plane coordinate system and the substrate plane coordinate system based on the linear offset angle and the preset coordinates of the theoretical printing start point in the substrate plane coordinate system of the substrate.
Step S306, converting the picture coordinates of each ink droplet into the theoretical pixel coordinates of each ink droplet in the substrate plane coordinate system based on the conversion relation.
Specifically, the actual printing ink drop dot pattern corresponding to the first printing area may be determined from a plurality of actual printing ink drop dot patterns, and after preprocessing the actual printing ink drop dot pattern, a canny edge detection is performed on the actual printing ink drop dot pattern to identify the strip-shaped positioning mark area 5 corresponding to the strip-shaped positioning mark. And fitting the strip-shaped positioning mark region 5, for example, fitting a straight line by using a least square method, so as to obtain a fitted straight line. After the fitted straight line is obtained, from the 4 edge lines of the actual printing ink drop dot matrix diagram, the edge line of the side where the strip-shaped positioning mark area 5 is located is taken as the line of the adjacent edge, the straight line deflection Angle is determined based on the line of the fitted straight line relative to the line of the adjacent edge in the actual printing ink drop dot matrix diagram, and the straight line deflection Angle is marked as angle= 。
For example, referring to fig. 8, fig. 8 is a schematic diagram of the adjacent edge line in the actual printing ink drop dot matrix diagram, in which a strip-shaped positioning mark area 5 and actual printing ink drops are displayed, and 4 edge lines of the actual printing ink drop dot matrix diagram are respectively edge line 1, edge line 2, edge line 3 and edge line 4, wherein the edge line 4 is the edge line of the side of the strip-shaped positioning mark area 5, and at this time, the edge line 4 is taken as the adjacent edge line, and the straight line deflection angle of the fitting straight line relative to the adjacent edge line is determined.
Further, after determining the fitted straight line, the start point P (x 0 ，y 0 ) And taking the fitting straight line as an origin, and constructing a picture plane coordinate system by taking the fitting straight line as an X axis. In the picture plane coordinate system, the positive X-axis direction is from left to right, and the positive Y-axis direction is from bottom to top. After the picture plane coordinate system is built, an ideal ink drop dot matrix two-dimensional container Pideal is built （x，y） (X, Y) and determining the theoretical coordinates of the first ink drop as Pideal （0，0） (0,0). After determining the theoretical coordinates of the first ink drop, determining the theoretical coordinates of each ink drop according to the total number of rows and total number of columns of ink drops, the first spacing distance between two adjacent ink drops in the row direction and the second spacing distance Height between two adjacent ink drops in the column direction, and storing the theoretical coordinates of each ink drop into an ideal two-dimensional container Pideal of the ink drop point array (x，y) (X, Y), i.e
。
After determining the theoretical coordinates of each ink drop, according to the linear deflection angleAnd determining a conversion relation between the picture plane coordinate system and the substrate plane coordinate system by using preset coordinates of the theoretical printing starting point in the substrate plane coordinate system of the substrate, determining a coordinate conversion formula based on the conversion relation, and finally converting the picture coordinate system of each ink drop into theoretical pixel coordinates of each ink drop in the substrate plane coordinate system by using the coordinate conversion formula. Wherein, the conversion formula is: />. After calculating the theoretical pixel coordinates of each ink droplet, the theoretical pixel coordinates of each ink droplet may be stored in a Point-type two-dimensional container P_Pideal (i,j) (x, y).
Step S40, determining a landing deviation value between the actual pixel coordinates and the theoretical pixel coordinates of each ink droplet.
After determining the actual pixel coordinates and the theoretical pixel coordinates of each ink droplet, the landing pixel deviation values of each actual ink droplet in the row direction and in the column direction may be determined. Since the row direction of the nozzle array is parallel to the bar-shaped positioning marks on the substrate, i.e. the drop pixel deviation values of each actual ink drop in the x and y directions of the substrate coordinate system are determined, i.e Wherein x is error Is the drop pixel deviation value, y, in the row direction of the ink drop error For drop pixel deviation value of ink drop in column direction, preal （i，j） P_Pideal is the actual pixel coordinates of the ith row and jth column ink drops （i，j） The theoretical pixel coordinates for the ith row and jth column ink drops. Since the current deviation is the drop pixel deviation value, it is also necessary to convert the drop pixel deviation into the drop deviation value. Thus, further, as an alternative embodiment, step S40 specifically includes:
step S401, determining a landing pixel deviation value of each ink droplet based on the actual pixel coordinates and the theoretical pixel coordinates of each ink droplet.
Step S402, determining the picture pixel size of the actual printing ink drop dot matrix chart.
Step S403, obtaining the landing deviation value based on the picture pixel size and the landing pixel deviation value.
In this embodiment, after the drop pixel deviation value of each ink droplet is determined based on the above operation, the drop pixel deviation of each ink droplet may be converted into the drop deviation value according to the pixel size of the dot matrix image of the ink droplet that is actually printed, and the pixel size of the dot matrix image of the ink droplet that is actually printed may be 2.5 micrometers×2.5 micrometers. After the landing deviation value of each ink droplet is obtained, the landing deviation value may be stored in a two-dimensional container Perror (i, j) of the Point type, and a landing deviation. Txt text is output.
And step S50, detecting the nozzle based on the drop point deviation value.
In this embodiment, based on the above, the drop Point deviation value is stored in the Point type two-dimensional container Perror (i, j), and after the drop Point deviation value txt text is output, the nozzle may be detected based on the drop Point deviation value txt text, so as to screen out the unqualified nozzle. In order to quickly detect the nozzles to screen out the failed nozzles, further, as an alternative embodiment, step S50 specifically includes:
step S501, determining, for each column of ink drops in the actual print ink drop dot matrix chart, a first landing deviation value and the second landing deviation value of all ink drops in the column of ink drops.
Step S502, determining a positive maximum first drop point deviation value and a negative maximum first drop point deviation value from all first drop point deviation values of the column ink drops, and determining a positive maximum second drop point deviation value and a negative maximum first drop point deviation value from all second drop point deviation values of the column ink drops.
In step S503, if the positive maximum first drop deviation value, the negative maximum first drop deviation value, the positive maximum second drop deviation value, and the negative maximum first drop deviation value are not within the preset deviation threshold, determining the nozzle to be printed corresponding to the ink drop column as an unqualified nozzle.
In this embodiment, the landing deviation value includes a first landing deviation value in the extending direction of the bar-shaped positioning mark, and a second landing deviation value in the extending direction perpendicular to the bar-shaped positioning mark, and referring to fig. 4, the extending direction of the bar-shaped positioning mark is parallel to the x-axis, and the extending direction perpendicular to the bar-shaped positioning mark is parallel to the y-axis.
Specifically, as shown in fig. 9 and 10, in which fig. 9 is an actual printed droplet dot matrix, fig. 10 is an enlarged schematic view of an actual droplet landing point S in fig. 9, and a cross-shaped intersection in fig. 10 is an ideal droplet landing point. And dividing ink drops in the actually printed ink drop dot matrix diagram to obtain a plurality of column ink drop groups. It will be appreciated that during printing, the actual drop point S may not coincide with the ideal drop point D, and the actual drop point S is relative to the ideal drop point DThe ink drop point D has a second drop point deviation y in the y-axis direction of the substrate coordinate system error A first drop point deviation x exists in the x-axis direction of the substrate coordinate system error 。
After a plurality of columns of ink drop groups are obtained, determining first drop point deviation values and second drop point deviation values of ink drops in each column of ink drop groups, respectively determining positive maximum first drop point deviation values and negative maximum first drop point deviation values based on the first drop point deviation values and the second drop point deviation values of all ink drops in each column of ink drop groups, and determining positive maximum second drop point deviation values and negative maximum second drop point deviation values, namely determining positive maximum first drop point deviation values and negative maximum first drop point deviation values from all first drop point deviation values and determining positive maximum second drop point deviation values and negative maximum first drop point deviation values from all second drop point deviation values. After determining the positive maximum first drop point deviation value, the negative maximum first drop point deviation value, the positive maximum second drop point deviation value and the negative maximum second drop point deviation value, judging whether the positive maximum first drop point deviation value, the negative maximum first drop point deviation value and the positive maximum second drop point deviation value are all within a preset deviation threshold range, and if the positive maximum first drop point deviation value, the negative maximum first drop point deviation value, the positive maximum second drop point deviation value and the negative maximum first drop point deviation value are not within the preset deviation threshold range, determining the nozzle to be printed corresponding to the ink drops as an unqualified nozzle.
It should be noted that, detecting the nozzle based on the landing deviation value, although the nozzle with insufficient printing precision can be screened out, when the printing precision of the nozzle meets the standard, the nozzle has poor flash effect in the printing process, and is easy to generate the situations of less printing or more printing. The nozzle is detected by using the drop point deviation value, and only the nozzle with insufficient precision can be screened out, but the nozzle with poor flash effect cannot be screened out, so that in order to screen out the nozzle with poor flash effect, further, as an optional implementation manner, after step S50, the method further includes:
step S504, determining the actual ink drop quantity of the ink drops in the column in the actual printing ink drop dot matrix chart.
And step 505, if the number of the actual ink drops is not equal to the preset printing times, determining the nozzle to be printed corresponding to the ink drops as a failed nozzle.
Specifically, ink drops in an actual printing ink drop dot matrix chart are divided to obtain a plurality of column ink drop groups, and the actual ink drop number in each column ink drop group is determined. And determining the preset printing times according to the printing line numbers, when the actual ink drop number is not equal to the printing line numbers, at the moment, proving that the ink drop in the row is unqualified, and the flash effect of the nozzle corresponding to the ink drop in the row is not good, so that the situation of more printing or less printing easily occurs, namely, if the actual ink drop number is not equal to the preset printing times, determining the nozzle to be printed corresponding to the ink drop in the row as the unqualified nozzle.
Further, after determining nozzles with insufficient accuracy and poor flash effect based on the above operations, the aggregate pneumonber can be used unqualified The nozzle number of the nozzle having insufficient accuracy and poor flash effect is recorded. Further, the missing printing nozzles detected in the steps S21-S22 are combined with the aggregate pneumonber based on the nozzle serial numbers of the missing printing nozzles unqualified And (3) recording nozzle serial numbers of nozzles with insufficient precision and poor flash spraying effect, finding out the actual nozzle serial numbers of the spray heads corresponding to the nozzle serial numbers by using a nozzle coding comparison table, finishing screening of unqualified nozzles, outputting a nozzle screening result, and disabling the unqualified nozzles during ink-jet printing.
In this embodiment, the row nozzle groups are controlled to print preset printing times at intervals along the column direction of the nozzle array in the corresponding printing area of the substrate, so as to obtain an actually printed ink drop dot matrix chart; the row nozzle group comprises a plurality of nozzles to be printed which are sequentially arranged at intervals along the column direction of a nozzle array, a preset number of nozzles are arranged between two adjacent nozzles to be printed at intervals in the nozzle array, and the substrate is provided with strip-shaped positioning marks; determining actual pixel coordinates of each ink drop relative to the bar positioning mark based on the actual printed ink drop dot matrix map; determining theoretical pixel coordinates of each ink drop in the actual printing ink drop dot matrix diagram relative to the strip-shaped positioning marks based on the azimuth relation between the printing area and the strip-shaped positioning marks; determining a landing deviation value between the actual pixel coordinates and the theoretical pixel coordinates of each ink drop; and detecting the nozzle based on the drop point deviation value. Compared with the prior art, the method and the device for detecting and screening the ink drop data of each nozzle sequentially detect and screen the ink drop data of each nozzle, in the embodiment, the ink drop dot array printed by all the nozzles in the row nozzle group is taken as a whole, the nozzles are detected by calculating the drop point deviation values of all the ink drops in the ink drop dot array, photographing of the ink drops printed by the single nozzle is not needed, photographing time is shortened, and therefore screening efficiency of the nozzles is improved.
In addition, compared with the construction of an ink drop observation system, the ink drop observation device is used for screening the nozzles, and the position of the printing nozzle needs to be continuously moved until the ink drops to be observed are positioned at the center of the field of view of the CCD camera module. In this embodiment, the ink drop dot matrix printed by the row nozzle group is photographed by only moving the camera and the substrate micro-stage without repeatedly moving the nozzle for long-time observation, so that an actual printing ink drop dot matrix diagram is obtained, and the probability of occurrence of a working accident is reduced. Meanwhile, when a single nozzle is detected by using the ink drop observer, after the flash spraying starts, the ink drops need to be stabilized, the flash spraying needs to be performed for a long time, so that the ink consumption is high, but the embodiment only needs to control the row nozzle groups to print at intervals along the column direction of the nozzle array in the corresponding printing area of the substrate for a preset printing times, and does not need to perform the flash spraying for multiple times until the ink drops are stabilized, so that the consumption of the ink drops is reduced.
Based on the same application conception, the nozzle detection device of the present application is proposed, and referring to fig. 11, fig. 11 is a schematic diagram of functional modules of the nozzle detection device of the present application.
The printing module 10 is used for controlling the row nozzle groups to print at preset printing times at intervals along the column direction of the nozzle array in the corresponding printing area of the substrate, and acquiring an actual printing ink drop dot matrix chart; the row nozzle group comprises a plurality of nozzles to be printed which are sequentially arranged at intervals along the row direction of the nozzle array, a preset number of nozzles are arranged between two adjacent nozzles to be printed at intervals in the nozzle array, and the substrate is provided with strip-shaped positioning marks extending along the transverse axis direction of a substrate coordinate system of the substrate;
A first determining module 20 for determining actual pixel coordinates of each ink drop relative to the bar positioning mark based on the actual printed ink drop dot matrix map;
a second determining module 30, configured to determine theoretical pixel coordinates of each ink droplet in the actually printed ink droplet dot matrix map relative to the bar positioning mark based on an azimuth relationship between the printing area and the bar positioning mark;
a third determining module 40 for determining a landing deviation value between the actual pixel coordinates and the theoretical pixel coordinates of each ink droplet;
the detection module 50 is configured to detect the nozzle based on the drop point deviation value.
It should be noted that, the nozzle detection device may further be provided with more modules, and the technical effects achieved by the embodiments of the nozzle detection device in this embodiment may refer to various implementations of the nozzle detection method in the foregoing embodiments, which are not described herein again.
In addition, the embodiment of the application also provides a computer storage medium, and a nozzle detection program is stored on the storage medium, and when the nozzle detection program is executed by a processor, the steps of the nozzle detection method are realized. Therefore, a detailed description will not be given here. In addition, the description of the beneficial effects of the same method is omitted. For technical details not disclosed in the embodiments of the computer-readable storage medium according to the present application, please refer to the description of the method embodiments of the present application. As an example, the program instructions may be deployed to be executed on one computing device or on multiple computing devices at one site or distributed across multiple sites and interconnected by a communication network.
Those skilled in the art will appreciate that implementing all or part of the above-described methods may be accomplished by way of computer programs, which may be stored on a computer-readable storage medium, and which, when executed, may comprise the steps of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random access Memory (Random AccessMemory, RAM), or the like.
It should be further noted that the above-described apparatus embodiments are merely illustrative, where elements described as separate elements may or may not be physically separate, and elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, in the drawings of the embodiment of the device provided by the application, the connection relation between the modules represents that the modules have communication connection therebetween, and can be specifically implemented as one or more communication buses or signal lines. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the present application may be implemented by means of software plus necessary general purpose hardware, or of course may be implemented by dedicated hardware including application specific integrated circuits, dedicated CPUs, dedicated memories, dedicated components and the like. Generally, functions performed by computer programs can be easily implemented by corresponding hardware, and specific hardware structures for implementing the same functions can be varied, such as analog circuits, digital circuits, or dedicated circuits. However, a software program implementation is a preferred embodiment in many cases for the present application. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a readable storage medium, such as a floppy disk, a usb disk, a removable hard disk, a Read-only memory (ROM), a random-access memory (RAM, randomAccessMemory), a magnetic disk or an optical disk of a computer, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method of the embodiments of the present application.
The foregoing description is only of the preferred embodiments of the present application, and is not intended to limit the scope of the claims, and all equivalent structures or equivalent processes using the descriptions and drawings of the present application, or direct or indirect application in other related technical fields are included in the scope of the claims of the present application.

Claims (8)

1. A method of nozzle detection, the method comprising:
controlling the row nozzle groups to print preset printing times at intervals along the column direction of the nozzle array in the corresponding printing area of the substrate, and obtaining an actual printing ink drop dot matrix chart; the row nozzle group comprises a plurality of nozzles to be printed, which are sequentially arranged at intervals along the row direction of a nozzle array, a preset number of nozzles are arranged between two adjacent nozzles to be printed at intervals in the nozzle array, the substrate is provided with strip-shaped positioning marks extending along the transverse axis direction of a substrate coordinate system of the substrate, and the row direction of the nozzle array is parallel to the strip-shaped positioning marks on the substrate; the printing area has a theoretical printing starting point;
determining actual pixel coordinates of each ink drop relative to the bar positioning mark based on the actual printed ink drop dot matrix map;
Determining theoretical pixel coordinates of each ink drop in the actual printing ink drop dot matrix diagram relative to the strip-shaped positioning marks based on the azimuth relation between the printing area and the strip-shaped positioning marks;
determining a landing deviation value between the actual pixel coordinates and the theoretical pixel coordinates of each ink drop;
detecting a nozzle based on the landing point deviation value;
the determining, based on the azimuth relation between the printing area and the bar positioning mark, theoretical pixel coordinates of each ink drop in the actual printing ink drop dot matrix map relative to the bar positioning mark includes:
performing bar positioning mark detection on the actually printed ink drop dot matrix graph to identify a bar positioning mark region;
fitting the strip-shaped positioning mark area to obtain a fitting straight line;
determining a linear deflection angle of the fitting straight line relative to the line of the adjacent edge; the adjacent edges are edge lines of the side where the strip-shaped positioning mark area is located among the 4 edges of the actually printed ink drop dot matrix image along the line;
constructing a picture plane coordinate system based on the theoretical printing starting point and the fitting straight line, and obtaining picture coordinates of each ink drop on the picture plane coordinate system;
Based on a linear offset angle and a preset coordinate of the theoretical printing starting point in a substrate plane coordinate system of the substrate, obtaining a conversion relation between the picture plane coordinate system and the substrate plane coordinate system;
converting the picture coordinates of each ink drop into the theoretical pixel coordinates of each ink drop in the substrate plane coordinate system based on the conversion relation;
constructing a picture plane coordinate system based on the theoretical printing starting point and the fitting straight line, and obtaining picture coordinates of each ink drop on the picture plane coordinate system, wherein the method comprises the following steps:
after determining a fitting straight line, constructing a picture plane coordinate system by taking a theoretical printing starting point as an original point and taking the fitting straight line as an X axis; in a picture plane coordinate system, the positive direction of the X axis is from left to right, and the positive direction of the Y axis is from bottom to top;
after the picture plane coordinate system is built, an ideal ink drop point array two-dimensional container is built, and the theoretical coordinate of the first ink drop is determined;
after the theoretical coordinates of the first ink drop are determined, determining the theoretical coordinates of each ink drop according to the total row number and the total column number of the ink drops, the first interval distance between two adjacent ink drops in the row direction and the second interval distance between two adjacent ink drops in the column direction, and storing the theoretical coordinates of each ink drop into an ideal ink drop point array two-dimensional container;
The drop point deviation value comprises a first drop point deviation value in the extending direction of the strip-shaped positioning mark and a second drop point deviation value in the extending direction perpendicular to the strip-shaped positioning mark, the nozzle is detected based on the drop point deviation value, and the method comprises the following steps:
determining first drop point deviation values and second drop point deviation values of all ink drops in the column ink drops according to the column ink drops of each column in the actual printing ink drop dot matrix diagram;
determining a positive maximum first drop point deviation value and a negative maximum first drop point deviation value from all first drop point deviation values of the ink drops in the array, and determining a positive maximum second drop point deviation value and a negative maximum second drop point deviation value from all second drop point deviation values of the ink drops in the array;
if the positive maximum first drop point deviation value, the negative maximum first drop point deviation value, the positive maximum second drop point deviation value and the negative maximum second drop point deviation value are not in the preset deviation threshold range, determining the nozzle to be printed corresponding to the ink drop row as a failed nozzle.
2. The nozzle detection method according to claim 1, wherein the determining a landing deviation value between the actual pixel coordinates and the theoretical pixel coordinates of each ink droplet includes:
Determining drop point pixel deviation values for each ink drop based on the actual pixel coordinates and the theoretical pixel coordinates of each ink drop;
determining the picture pixel size of the actual printing ink drop dot matrix image;
and obtaining the landing point deviation value based on the picture pixel size and the landing point pixel deviation value.
3. The nozzle detection method according to claim 1, wherein the determining actual pixel coordinates of each ink droplet with respect to the bar-shaped positioning mark based on the actually printed ink droplet dot pattern includes:
determining the central pixel coordinates of each ink drop in the actual printing ink drop dot matrix chart;
the actual pixel coordinates of each ink drop are determined based on the center pixel coordinates of each ink drop.
4. A nozzle detection method according to claim 3, wherein said determining said actual pixel coordinates of each ink droplet based on said center pixel coordinates of each ink droplet further comprises:
judging whether printing ink drops are missed or not based on the actual printing ink drop dot matrix diagram;
if the missing printing ink drop exists, determining a missing printing nozzle based on the missing printing ink drop.
5. The method of claim 1, wherein after the detecting the nozzle based on the landing deviation value, the method further comprises:
Determining an actual ink drop number of the column ink drops in the actual printing ink drop dot matrix map;
and if the actual ink drop quantity is not equal to the preset printing times, determining the nozzle to be printed corresponding to the ink drops in the row as a disqualified nozzle.
6. A nozzle detection apparatus, characterized in that the nozzle detection apparatus comprises:
the printing module is used for controlling the row nozzle groups to print preset printing times at intervals along the column direction of the nozzle array in the corresponding printing area of the substrate, and acquiring an actual printing ink drop dot matrix chart; the row nozzle group comprises a plurality of nozzles to be printed, which are sequentially arranged at intervals along the row direction of a nozzle array, a preset number of nozzles are arranged between two adjacent nozzles to be printed at intervals in the nozzle array, the substrate is provided with strip-shaped positioning marks extending along the transverse axis direction of a substrate coordinate system of the substrate, and the row direction of the nozzle array is parallel to the strip-shaped positioning marks on the substrate; the printing area has a theoretical printing starting point;
a first determining module for determining actual pixel coordinates of each ink drop relative to the bar positioning mark based on the actual printed ink drop dot matrix map;
the second determining module is used for determining theoretical pixel coordinates of each ink drop in the actual printing ink drop dot matrix graph relative to the strip-shaped positioning marks based on the azimuth relation between the printing area and the strip-shaped positioning marks; comprising the following steps: performing bar positioning mark detection on the actually printed ink drop dot matrix graph to identify a bar positioning mark region; fitting the strip-shaped positioning mark area to obtain a fitting straight line; determining a linear deflection angle of the fitting straight line relative to the line of the adjacent edge; the adjacent edges are edge lines of the side where the strip-shaped positioning mark area is located among the 4 edges of the actually printed ink drop dot matrix image along the line; constructing a picture plane coordinate system based on the theoretical printing starting point and the fitting straight line, and obtaining picture coordinates of each ink drop on the picture plane coordinate system; based on a linear offset angle and a preset coordinate of the theoretical printing starting point in a substrate plane coordinate system of the substrate, obtaining a conversion relation between the picture plane coordinate system and the substrate plane coordinate system; converting the picture coordinates of each ink drop into the theoretical pixel coordinates of each ink drop in the substrate plane coordinate system based on the conversion relation; constructing a picture plane coordinate system based on the theoretical printing starting point and the fitting straight line, and obtaining picture coordinates of each ink drop on the picture plane coordinate system, wherein the method comprises the following steps: after determining a fitting straight line, constructing a picture plane coordinate system by taking a theoretical printing starting point as an original point and taking the fitting straight line as an X axis; in a picture plane coordinate system, the positive direction of the X axis is from left to right, and the positive direction of the Y axis is from bottom to top; after the picture plane coordinate system is built, an ideal ink drop point array two-dimensional container is built, and the theoretical coordinate of the first ink drop is determined; after the theoretical coordinates of the first ink drop are determined, determining the theoretical coordinates of each ink drop according to the total row number and the total column number of the ink drops, the first interval distance between two adjacent ink drops in the row direction and the second interval distance between two adjacent ink drops in the column direction, and storing the theoretical coordinates of each ink drop into an ideal ink drop point array two-dimensional container;
A third determining module, configured to determine a landing deviation value between the actual pixel coordinate and the theoretical pixel coordinate of each ink droplet;
the detection module is used for detecting the nozzle based on the drop point deviation value, the drop point deviation value comprises a first drop point deviation value in the extending direction of the strip-shaped positioning mark, and a second drop point deviation value in the extending direction perpendicular to the strip-shaped positioning mark, and the detection module comprises: determining first drop point deviation values and second drop point deviation values of all ink drops in the column ink drops according to the column ink drops of each column in the actual printing ink drop dot matrix diagram; determining a positive maximum first drop point deviation value and a negative maximum first drop point deviation value from all first drop point deviation values of the ink drops in the array, and determining a positive maximum second drop point deviation value and a negative maximum second drop point deviation value from all second drop point deviation values of the ink drops in the array; if the positive maximum first drop point deviation value, the negative maximum first drop point deviation value, the positive maximum second drop point deviation value and the negative maximum second drop point deviation value are not in the preset deviation threshold range, determining the nozzle to be printed corresponding to the ink drop row as a failed nozzle.
7. A nozzle detection apparatus, characterized by comprising: a processor, a memory and a nozzle detection program stored in the memory, which when executed by the processor, implements the steps of the nozzle detection method according to any one of claims 1 to 5.
8. A computer-readable storage medium, wherein a nozzle detection program is stored on the computer-readable storage medium, which when executed by a processor, implements the nozzle detection method according to any one of claims 1 to 5.
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Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108944048A (en) * 2017-11-21 2018-12-07 广东聚华印刷显示技术有限公司 Localization method, positioning system and the detection system of the nozzle of inkjet-printing device
CN110077111A (en) * 2018-05-30 2019-08-02 广东聚华印刷显示技术有限公司 The bearing calibration of inkjet print head, device and system
CN110111383A (en) * 2018-05-08 2019-08-09 广东聚华印刷显示技术有限公司 The offset correction method of glass substrate, device and system
CN110143055A (en) * 2018-05-22 2019-08-20 广东聚华印刷显示技术有限公司 The bearing calibration of ink droplet drops positional shift, device and system
CN111242885A (en) * 2018-11-13 2020-06-05 广东聚华印刷显示技术有限公司 Method and device for detecting abnormal nozzle
CN111397539A (en) * 2020-03-28 2020-07-10 华中科技大学 Multi-view visual detection system and method for ink-jet printing
CN112319067A (en) * 2020-09-18 2021-02-05 季华实验室 Ink jet printing data distribution method, device, equipment and storage medium
CN113500856A (en) * 2021-05-13 2021-10-15 深圳圣德京粤科技有限公司 Ink-jet printing register device, register method and plate changing method
CN114211878A (en) * 2021-12-13 2022-03-22 苏州华星光电技术有限公司 Detection method of ink-jet printing ink, storage medium and equipment
CN114536975A (en) * 2022-02-28 2022-05-27 华中科技大学 Method and device for detecting positioning precision of ink drop point in ink-jet printing
CN115183981A (en) * 2022-06-23 2022-10-14 新拓三维技术(深圳)有限公司 Wind tunnel coordinate shafting calibration method and calibration device based on coding marks
CN115371981A (en) * 2022-10-25 2022-11-22 季华实验室 Method, device, equipment and medium for screening nozzles
CN115555648A (en) * 2022-09-22 2023-01-03 江南造船(集团)有限责任公司 Numerical control cutting method, system, equipment and medium
CN115686394A (en) * 2022-10-31 2023-02-03 深圳市汇川技术股份有限公司 Printing correction method, device, equipment and storage medium
CN116381266A (en) * 2023-03-29 2023-07-04 华中科技大学 Method and system for detecting ink drops ejected by jet printing nozzle array
CN116638766A (en) * 2023-05-31 2023-08-25 南京焕型智剂医药科技有限公司 3D printing deviation detection method and device and computer equipment

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107685539B (en) * 2017-09-22 2019-04-23 京东方科技集团股份有限公司 Ink jet printing head, ink-jet system for measuring quantity and method and ink-jet amount control method

Patent Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108944048A (en) * 2017-11-21 2018-12-07 广东聚华印刷显示技术有限公司 Localization method, positioning system and the detection system of the nozzle of inkjet-printing device
CN110111383A (en) * 2018-05-08 2019-08-09 广东聚华印刷显示技术有限公司 The offset correction method of glass substrate, device and system
CN110143055A (en) * 2018-05-22 2019-08-20 广东聚华印刷显示技术有限公司 The bearing calibration of ink droplet drops positional shift, device and system
CN110077111A (en) * 2018-05-30 2019-08-02 广东聚华印刷显示技术有限公司 The bearing calibration of inkjet print head, device and system
CN111242885A (en) * 2018-11-13 2020-06-05 广东聚华印刷显示技术有限公司 Method and device for detecting abnormal nozzle
CN111397539A (en) * 2020-03-28 2020-07-10 华中科技大学 Multi-view visual detection system and method for ink-jet printing
CN112319067A (en) * 2020-09-18 2021-02-05 季华实验室 Ink jet printing data distribution method, device, equipment and storage medium
CN113500856A (en) * 2021-05-13 2021-10-15 深圳圣德京粤科技有限公司 Ink-jet printing register device, register method and plate changing method
CN114211878A (en) * 2021-12-13 2022-03-22 苏州华星光电技术有限公司 Detection method of ink-jet printing ink, storage medium and equipment
CN114536975A (en) * 2022-02-28 2022-05-27 华中科技大学 Method and device for detecting positioning precision of ink drop point in ink-jet printing
CN115183981A (en) * 2022-06-23 2022-10-14 新拓三维技术(深圳)有限公司 Wind tunnel coordinate shafting calibration method and calibration device based on coding marks
CN115555648A (en) * 2022-09-22 2023-01-03 江南造船(集团)有限责任公司 Numerical control cutting method, system, equipment and medium
CN115371981A (en) * 2022-10-25 2022-11-22 季华实验室 Method, device, equipment and medium for screening nozzles
CN115686394A (en) * 2022-10-31 2023-02-03 深圳市汇川技术股份有限公司 Printing correction method, device, equipment and storage medium
CN116381266A (en) * 2023-03-29 2023-07-04 华中科技大学 Method and system for detecting ink drops ejected by jet printing nozzle array
CN116638766A (en) * 2023-05-31 2023-08-25 南京焕型智剂医药科技有限公司 3D printing deviation detection method and device and computer equipment

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