Nozzle control method and ink-jet printing equipment

Abstract

The invention provides a nozzle control method and ink-jet printing equipment, and the nozzle control method comprises the steps: controlling a plurality of first nozzles to carry out first ink drop detection, and determining a plurality of second nozzles from the plurality of first nozzles; controlling the plurality of second nozzles to perform simulated printing; and controlling the plurality of second nozzles after simulation printing to carry out second ink drop detection, and determining a plurality of target nozzles from the plurality of second nozzles. According to the nozzle control method, the technical problem that the screening effect of an existing nozzle is poor can be solved.

Description

Technical Field

[0001] The present application relates to the field of inkjet printing technology, and in particular to a nozzle control method and an inkjet printing device. Background Art

[0002] The use of inkjet printing technology to produce OLED (Organic Light-Emitting Diode) or QLED (Quantum Dots Light Emitting Diode Display) displays is the main process for producing large-size displays in the future. That is, the functional layer material ink is injected into the pixel opening through inkjet printing equipment to form an organic light-emitting layer.

[0003] Among them, the nozzles of inkjet printing equipment may be in abnormal state due to ink precipitation, dust, water vapor, etc., which in turn causes abnormal ink droplets to be ejected, thus affecting the printing quality. Therefore, in order to ensure the printing quality, the nozzles on the inkjet printing equipment need to be checked and screened before each formal printing, so as to select the nozzles that meet the printing requirements for formal printing.

[0004] However, the screening effect of the existing nozzles is not good and needs to be further improved. Summary of the invention

[0005] Embodiments of the present application provide a nozzle control method and an inkjet printing device.

[0006] Among them, the nozzle control method proposed in this application includes:

[0007] Controlling a plurality of first nozzles to perform a first ink drop detection, and determining a plurality of second nozzles from the plurality of first nozzles;

[0008] Controlling the plurality of second nozzles to perform simulated printing;

[0009] The plurality of second nozzles after the simulation printing are controlled to perform a second ink drop detection, and a plurality of target nozzles are determined from the plurality of second nozzles.

[0010] The step of controlling the plurality of first nozzles to perform the first ink drop detection and determining the plurality of second nozzles from the plurality of first nozzles comprises:

[0011] Controlling the plurality of first nozzles to drop a plurality of first ink drops on the detection substrate;

[0012] Obtaining a first characteristic parameter of the first ink droplet;

[0013] A plurality of second nozzles are selected from the plurality of first nozzles according to the first characteristic parameter.

[0014] Wherein, the first characteristic parameter includes a first actual position and a first actual area, and the step of selecting a plurality of second nozzles from the plurality of first nozzles according to the first characteristic parameter includes:

[0015] Acquire a first target position of the first ink droplet;

[0016] determining a first offset of the first actual position relative to the first target position;

[0017] When the first offset is less than or equal to a first reference value and the first actual area is within a preset reference range, determining that the corresponding first ink droplet is a first target ink droplet;

[0018] The first nozzle corresponding to the first target ink droplet is determined to be the second nozzle.

[0019] Wherein, the detection substrate is provided with an alignment mark, and the step of obtaining the first target position of the first ink droplet includes:

[0020] Aligning the inspection substrate to a preset virtual coordinate system according to the alignment mark;

[0021] Acquire a first virtual coordinate corresponding to the first nozzle in the virtual coordinate system;

[0022] Determining the first virtual coordinate as the first target position;

[0023] The step of determining a first offset of the first actual position relative to the first target position comprises:

[0024] Acquire a first actual coordinate corresponding to the first actual position in the virtual coordinate system;

[0025] The first offset is determined according to the first actual coordinate and the first virtual coordinate.

[0026] Wherein, the first offset includes a first longitudinal offset and a first lateral offset, and the first reference value includes a first longitudinal reference value and a first lateral reference value;

[0027] When the first longitudinal offset is less than or equal to a first longitudinal reference value, the first lateral offset is less than or equal to a first lateral reference value, and the first actual area is within a preset reference range, the corresponding first ink drop is determined to be a first target ink drop.

[0028] Among them, the first longitudinal reference value is greater than or equal to 5 microns and less than or equal to 10 microns, and the first transverse reference value is greater than or equal to 8 microns and less than or equal to 12 microns; the lower limit value of the preset reference range is greater than or equal to 1300 square microns, and the upper limit value is less than or equal to 1500 square microns.

[0029] The nozzle control method is performed before formal inkjet printing, and the step of controlling the plurality of second nozzles to perform simulated printing includes:

[0030] Get the printing parameters for formal inkjet printing;

[0031] The plurality of second nozzles are controlled to perform simulated printing on the detection substrate according to the printing parameters.

[0032] The step of controlling the plurality of second nozzles after the simulated printing to perform the second ink drop detection and determining a plurality of target nozzles from the plurality of second nozzles comprises:

[0033] Controlling the plurality of second nozzles to drop a plurality of second ink drops on a third area of ​​the detection substrate;

[0034] obtaining a second characteristic parameter of the second ink droplet;

[0035] A plurality of target nozzles are determined from the plurality of second nozzles according to the second characteristic parameter.

[0036] Wherein, the second characteristic parameter includes a second actual position and a second actual area, and the step of determining a plurality of target nozzles from the plurality of second nozzles according to the second characteristic parameter includes:

[0037] Acquire a second target position of the second ink droplet;

[0038] determining a second offset of the second actual position relative to the second target position;

[0039] Calculating an offset difference between the first offset and the second offset, and an area difference between the first actual area and the second actual area;

[0040] When the offset difference is less than or equal to a second reference value, and the area difference is less than or equal to a third reference value, determining that the corresponding second ink droplet is a second target ink droplet;

[0041] The second nozzle corresponding to the second target ink droplet is determined as the target nozzle.

[0042] Wherein, the detection substrate is provided with an alignment mark, and the step of obtaining the second target position of the second ink droplet includes:

[0043] Aligning the inspection substrate to a preset virtual coordinate system according to the alignment mark;

[0044] Acquire a second virtual coordinate corresponding to the first nozzle in the virtual coordinate system;

[0045] determining the second virtual coordinate as the second target position;

[0046] The step of determining a second offset of the second actual position relative to the second target position comprises:

[0047] Acquire a second actual coordinate corresponding to the second actual position in the virtual coordinate system;

[0048] The second offset is determined according to the second actual coordinate and the second virtual coordinate.

[0049] The offset difference includes a longitudinal offset difference and a lateral offset difference, and the second reference value includes a second longitudinal reference value and a second lateral reference value;

[0050] When the longitudinal offset difference is less than or equal to a second longitudinal reference value, the lateral offset difference is less than or equal to a second lateral reference value, and the area difference is less than or equal to a third reference value, the corresponding second ink drop is determined to be a second target ink drop.

[0051] Wherein, the first offset includes a first longitudinal offset and a first lateral offset, and the second offset includes a second longitudinal offset and a second lateral offset;

[0052] Determine the absolute value of the difference between the first longitudinal offset and the second longitudinal offset as the longitudinal offset difference;

[0053] The absolute value of the difference between the first lateral offset and the second lateral offset is determined as the longitudinal offset difference.

[0054] Among them, the second longitudinal reference value is greater than or equal to 1 micron and less than or equal to 5 microns, the second lateral reference value is greater than or equal to 3 microns and less than or equal to 7 microns, and the third reference value is greater than or equal to 100 square microns and less than or equal to 150 square microns.

[0055] Wherein, the plurality of first nozzles are controlled to perform a first ink drop detection in a first area of ​​a detection substrate, the plurality of second nozzles are controlled to perform simulated printing in a second area of ​​the detection substrate, and the plurality of second nozzles are controlled to perform a second ink drop detection in a third area of ​​the detection substrate; wherein the surfaces of the first area and the third area are both planes, and a plurality of pixel openings are provided in the second area.

[0056] The detection substrate is provided with at least two first areas, and the step of controlling the plurality of first nozzles to perform the first ink drop detection in the first area of ​​the detection substrate comprises:

[0057] Controlling each of the first nozzles to drop a first ink droplet in each of the first regions, or controlling each of the first nozzles to drop a first ink droplet at at least two different positions in the first region;

[0058] And / or, the step of controlling the plurality of second nozzles to perform a second ink drop detection in the third area of ​​the detection substrate includes:

[0059] Control each of the second nozzles to drop a second ink droplet in each of the third regions, or control each of the second nozzles to drop a second ink droplet at at least two different positions in the third region;

[0060] And / or, the step of controlling the plurality of second nozzles to perform simulated printing in the second area of ​​the detection substrate includes:

[0061] Get the printing parameters of inkjet printing;

[0062] The plurality of second nozzles are controlled to drop ink into the plurality of pixel openings according to the printing parameters.

[0063] The present application also proposes an inkjet printing device, which includes a carrier, an inkjet device, a control device and a detection device; the carrier is at least used to carry a detection substrate, the inkjet device is provided with multiple nozzles, and the control device is at least used to control the multiple nozzles to provide ink to the detection substrate to form ink droplets; the detection device is at least used to detect ink droplets on the detection substrate and output the detection results to the control device; the control device includes a screening module, and the screening module is used to screen nozzles according to the detection results.

[0064] Wherein, the control device further establishes a virtual coordinate system, and the inkjet printing device further comprises an alignment device, and the alignment device is used to align the detection substrate and the nozzle to the virtual coordinate system; and / or,

[0065] The detection substrate has a first area, a second area and a third area, the surfaces of the first area and the third area are both planes, and a plurality of pixel openings are arranged in the second area;

[0066] The control device is at least used to control the plurality of nozzles to provide ink to the first area, the second area and the third area to form ink droplets;

[0067] The detection device is used to detect ink drops on the first area and the third area.

[0068] The nozzle control method provided in the present application includes two screening actions and simulated printing interspersed between the two screening actions, so that nozzles that did not show abnormalities in the first screening but showed abnormalities during the printing process can be discovered in time, thereby improving the nozzle screening effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0070] Figure 1 This is a schematic structural diagram of an embodiment of an inkjet printing device of the present application;

[0071] Figure 2 A schematic structural diagram of an embodiment of a detection substrate used in the nozzle control method of the present application;

[0072] Figure 3 A schematic flow chart of the nozzle control method of the present application;

[0073] Figure 4 Based Figure 3 Specific flow diagram of step S1 in FIG.

[0074] Figure 5 Based Figure 4 Specific flow diagram of step S13 in FIG.

[0075] Figure 6 Based Figure 3 Specific flow diagram of step S2 in FIG.

[0076] Figure 7 Based Figure 3 Specific flow diagram of step S3 in FIG.

[0077] Figure 8 Based Figure 7 Specific flow chart of step S33 in FIG.

[0078] Description of the accompanying drawings: 100, inkjet printing device; 10, carrier platform; 20, inkjet device; 21, print head; 30, detection device; 40, detection substrate; 41, first area; 42, second area; 43, third area; 44, alignment mark;

[0079] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0080] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0081] The embodiment of the present application provides a nozzle control method to solve the problem of poor screening effect of existing nozzles, which will be described below with reference to the accompanying drawings.

[0082] First, the nozzle printing method of the present application is implemented by an inkjet printing device 100, such as Figure 1 As shown, the inkjet printing device 100 mainly includes a carrier 10, an inkjet device 20 and a detection device 30, wherein the carrier 10 is used to carry a glass substrate to be inkjetted (Note: the glass substrate can be a detection substrate for detection or a printing substrate for inkjet printing), and the carrier 10 can drive the glass substrate to move to the inkjet device 20 and the detection device 30. The inkjet device 20 mainly includes an ink cartridge (not shown) for storing ink, a print head 21 connected to the ink cartridge, and a plurality of nozzles (not shown) arranged on the print head 21. When inkjetting, the ink flows into the nozzle, and the nozzle sprays ink to the glass substrate through the nozzle, thereby realizing the printing of the organic light-emitting layer. The detection device 30 is used to detect ink droplets on the glass substrate to obtain the printing conditions of the ink droplets on the glass substrate, such as detecting the position of the ink droplets on the glass substrate, the area or volume of the ink droplets, etc.; in addition, the detection device 30 can detect the ink droplets on the glass substrate by laser reflection, camera shooting, etc. For example, in the present application, the detection device 30 uses a camera to shoot the ink droplets on the glass substrate, which not only can well obtain the printing conditions of the ink droplets, but also has low cost and is easy to obtain.

[0083] Based on the inkjet printing device 100 of the above structure, in the embodiment of the present application, Figure 3 As shown, the nozzle control method includes:

[0084] Step S1: controlling a plurality of first nozzles to perform a first ink drop detection, and determining a plurality of second nozzles from the plurality of first nozzles.

[0085] Step S2: controlling the plurality of second nozzles to perform simulated printing.

[0086] Step S3: controlling the plurality of second nozzles after the simulation printing to perform a second ink drop detection, and determining a plurality of target nozzles from the plurality of second nozzles.

[0087] Among them, for step S1, in this embodiment, if Figure 2 As shown, step S1 specifically includes:

[0088] Step S11: Control multiple first nozzles to drop multiple first ink drops on the detection substrate 40. Specifically, before starting the screening, a detection substrate 40 needs to be provided, such as Figure 2 As shown, the detection substrate 40 is divided into a first area 41, a second area 42 and a third area 43, wherein the surfaces of the first area 41 and the third area 43 are flat, so that the position and area of ​​the ink droplets can be observed after the nozzle drips the ink; the second area 42 is provided with a thin film transistor and a plurality of pixel openings, so that the nozzle can simulate formal inkjet printing in the second area 42.

[0089] In actual operation, the detection substrate 40 is first positioned on the carrier 10, such as Figure 2 As shown, in order to facilitate the accurate alignment of the nozzles to the first area 41, the second area 42 or the third area 43 on the detection substrate 40, an alignment mark 44 is provided on the detection substrate 40. After the detection substrate 40 is mounted on the carrier 10, the control device of the inkjet printing device 100 can use the alignment mark 44 to align the detection substrate 40 to a preset virtual coordinate system, for example, the side of the detection substrate 40 is aligned on the Y axis of the virtual coordinate system, and when the detection substrate 40 moves, the side of the detection substrate 40 moves along the Y axis of the virtual coordinate system. At the same time, the control device of the inkjet printing device 100 also corresponds the position of each nozzle to the virtual coordinate system, so that the positional relationship between the multiple nozzles and the detection substrate 40 can be well controlled, and then each nozzle can be controlled to accurately correspond to different positions on the detection substrate 40.

[0090] After the detection substrate 40 is aligned, the multiple first nozzles can be controlled to correspond to the first area 41 of the detection substrate 40, and the switches on the multiple first nozzles can be controlled to be turned on, so that the multiple first nozzles can drip multiple first ink droplets in the first area 41. It should be noted here that when controlling the multiple first nozzles to drip the first ink droplets, each first nozzle can drip one ink droplet, which is the first ink droplet; or each first nozzle can drip more than two ink drops at the same position, and the more than two ink drops form a first ink droplet. The specific number of ink droplets dripped by each first nozzle can be set according to the ink dripping situation of the nozzle during formal inkjet printing. For example, during formal inkjet printing, the nozzle only drips one ink droplet each time it passes through a pixel opening, and the number of ink droplets dripped by the first nozzle at the same position in the first area 41 can be one drop; and if the nozzle drips two ink drops each time it passes through a pixel opening, the number of ink droplets dripped by the first nozzle at the same position in the first area 41 can also be two drops. It can be understood that in this way, the inkjet state of the first nozzle during screening can be closer to the inkjet state during formal printing, which is more conducive to improving the screening effect.

[0091] Step S12: Obtain the first characteristic parameter of the first ink droplet. Specifically, the present embodiment mainly detects the first characteristic parameter of the first ink droplet through the detection device 30, and the detection device 30 includes a camera and a processing module, wherein the camera can capture an image of the first ink droplet, and the processing module can process the image of the first ink droplet and output the first characteristic parameter of the first ink droplet. The first characteristic parameter of the first ink droplet mainly includes a first actual position and a first actual area, wherein the processing module can determine the first actual position of the first ink droplet by aligning the image with the first ink droplet to the virtual coordinate system in the alignment device. Generally, the position where the center of the first ink droplet is located can be used as the first actual position. As for the first actual area of ​​the first ink droplet, the boundary of the ink droplet can be determined by an image processing algorithm, and then the area of ​​the ink droplet can be calculated. The specific processing method can refer to the prior art, and will not be introduced in detail here.

[0092] It can be understood that the three most important parameters of ink droplets in inkjet printing are volume, speed and angle. The first actual area can reflect the volume of the first ink droplet, and then judge whether the volume of the first ink droplet is too large, too small or the right size; the first actual position can reflect the speed and angle of the first ink droplet, and then judge whether the speed of the ink droplet is too fast or too slow, and judge whether it deviates from the target printing position when dripping.

[0093] Of course, in actual application, the first characteristic parameter of the first ink droplet may also directly include the volume, speed or angle of the ink droplet. In this case, the detection device 30 is also replaced with a device type that can detect the volume, speed and angle of the ink droplet.

[0094] After the first characteristic parameter of the first ink droplet is obtained, step S13 may be executed.

[0095] Step S13: Determine a plurality of second nozzles from the plurality of first nozzles according to the first characteristic parameter. Figure 5 As shown, this step S13 includes:

[0096] Step S131: acquiring a first target position of the first ink droplet;

[0097] Step S132: determining a first offset of the first actual position relative to the first target position;

[0098] Step S133: when the first offset is less than or equal to a first reference value, and the first actual area is within a preset reference range, determining that the corresponding first ink droplet is a first target ink droplet;

[0099] Step S134: determining that the first nozzle corresponding to the first target ink droplet is the second nozzle.

[0100] Among them, for step S131, the first target position of the first ink droplet is the ideal position where the ink droplet falls on the detection substrate 40 when the first nozzle drips the ink droplet without any abnormality. Generally, the first nozzle is located directly above the detection substrate 40, and the ink droplet falls onto the detection substrate 40 by free fall without any interference, so the first target position is generally located directly below the first nozzle. Therefore, the first target position of the first ink droplet on the detection substrate 40 can actually be determined by the position of the corresponding first nozzle. Therefore, in the embodiment of the present application, step S131 includes:

[0101] Step S1311: aligning the inspection substrate 40 to a preset virtual coordinate system according to the alignment mark 44;

[0102] Step S1312: obtaining a first virtual coordinate corresponding to the first nozzle in the virtual coordinate system;

[0103] Step S1313: Determine the first virtual coordinate as the first target position.

[0104] Specifically, as described above, the inkjet printing device 100 is generally equipped with an alignment device to control each nozzle to accurately align with different pixel openings. In this step, the entire detection substrate 40 can be aligned to a virtual coordinate system preset in the alignment device through the alignment mark 44 on the detection substrate 40. For example, the side of the detection substrate 40 is aligned on the Y axis of the virtual coordinate system, so that the positional relationship between the nozzle and the detection substrate 40 can be determined. Then, the first virtual coordinate corresponding to the first nozzle in the virtual coordinate system is obtained, and the first virtual coordinate is determined as the first target position of the first ink droplet.

[0105] Step S132 specifically includes:

[0106] Step S1321: Acquire the first actual coordinates corresponding to the first actual position in the virtual coordinate system;

[0107] Step S1322: determining the first offset according to the first actual coordinate and the first virtual coordinate.

[0108] Specifically, after the detection device 30 captures the image of the first ink droplet, the image with the first ink droplet can be output to the control device. The control device aligns the image with the first ink droplet to the virtual coordinate system, and then obtains the first actual coordinate corresponding to the first actual position. At this time, the difference between the first actual coordinate and the first virtual coordinate is calculated, so that the first offset of the first actual position relative to the first target position can be determined more conveniently.

[0109] It should be noted that the first offset may be the straight-line distance between the first actual position and the first target position, or may be split into an offset in the X-axis direction and an offset in the Y-axis direction. The specific data format may be flexibly selected according to actual conditions.

[0110] For step S133 and step S134, after determining the first offset and the first actual area of ​​the first ink drop, the first offset and the first reference value can be compared, and it can be determined whether the first actual area is within the preset reference range. When the first offset is less than or equal to the first reference value, it means that the first ink drop deviates from the first target position by a small amount, and further indicates that the first ink drop is qualified at least in terms of the two parameters of speed and angle; when the first offset is greater than the first reference value, it means that the first ink drop deviates from the first target position by a large amount, and further indicates that the first ink drop is unqualified at least in terms of the two parameters of speed and angle. At this time, the first ink drop can be determined to be unqualified, and the corresponding nozzle is in an abnormal state, does not meet the requirements, and should be closed or removed. Similarly, when the first actual area is within the preset reference range, it means that the area and volume of the first ink drop meet the requirements, and when the first actual area is outside the preset reference range, it means that the area and volume of the first ink drop do not meet the requirements. At this time, the first ink drop can be determined to be unqualified, and the corresponding nozzle is in an abnormal state, does not meet the requirements, and should be closed or removed.

[0111] Therefore, when the first offset is less than or equal to the first reference value and the first actual area is within a preset reference range, the corresponding first ink droplet can be determined as a first target ink droplet, and the first nozzle corresponding to the first target ink droplet can also be determined as the second nozzle.

[0112] It should be noted here that, in order to reduce the amount of calculation, in one embodiment, the first offset includes a first longitudinal offset and a first lateral offset, wherein the "longitudinal and lateral" defined in this embodiment can be one of the Y-axis and the other of the X-axis. Similarly, the first reference value also adaptively includes a first longitudinal reference value and a first lateral reference value. Therefore, when the first longitudinal offset is less than or equal to the first longitudinal reference value, the first lateral offset is less than or equal to the first lateral reference value, and the first actual area is within a preset reference range, it can be determined that the corresponding first ink droplet is the first target ink droplet, and the nozzle corresponding to the first target ink droplet is the first nozzle. It can be understood that by directly comparing the first longitudinal offset and the first longitudinal reference value, and the first lateral offset and the first lateral reference value, the amount of calculation can be reduced, thereby improving the processing efficiency of the inkjet printing device 100.

[0113] It should also be noted that the specific values ​​of the first reference value and the preset reference range can be set according to the actual nozzle size, the moving speed of the nozzle during inkjet printing, the ink type, etc. For example, in the present application, the first longitudinal reference value is greater than or equal to 5 microns and less than or equal to 10 microns, that is, the specific value of the first longitudinal reference value can be 5 microns, 5.5 microns, 6 microns, 6.5 microns, 7 microns, 7.5 microns, 8 microns, 8.5 microns, 9 microns, 9.5 microns, 10 microns, etc. The first transverse reference value is greater than or equal to 8 microns and less than or equal to 12 microns, that is, the specific value of the second longitudinal reference value can be 8 microns, 8.5 microns, 9 microns, 9.5 microns, 10 microns, 10.5 microns, 11 microns, 11.5 microns, 12 microns, etc. The lower limit value of the preset reference range is greater than or equal to 1300 square microns, and the upper limit value is less than or equal to 1500 square microns. The specific preset reference range may be 1300 square microns to 1500 square microns, 1300 square microns to 1450 square microns, 1300 square microns to 1400 square microns, 1300 square microns to 1350 square microns, 1350 square microns to 1500 square microns, 1350 square microns to 1450 square microns, 1350 square microns to 1400 square microns, 1400 square microns to 1500 square microns, 1400 square microns to 1450 square microns, and so on.

[0114] More specifically, in one embodiment of the present application, the specific value of the first longitudinal reference value is 7.5 microns, the specific value of the second longitudinal reference value is 10 microns, and the specific preset reference range is 1300 square microns to 1500 square microns. Therefore, when the first longitudinal offset is less than or equal to 7.5 microns, the first lateral offset is less than or equal to 10 microns, and the first actual area is between 1300 square microns and 1500 square microns, it can be determined that the corresponding first ink droplet is the first target ink droplet, and the first nozzle corresponding to the first target ink droplet is the second nozzle.

[0115] At this point, through the above step S1, a plurality of second nozzles without abnormalities are preliminarily screened out from the plurality of first nozzles, and then steps S2 to S3 can be continued.

[0116] Step S2: Control the plurality of second nozzles to perform simulated printing. Figure 6 As shown, step S2 specifically includes:

[0117] Step S21: obtaining printing parameters of inkjet printing;

[0118] Step S22: controlling the plurality of second nozzles to perform simulated printing on the detection substrate according to the printing parameters.

[0119] Among them, because before each formal inkjet printing, the staff will preset the corresponding printing parameters on the inkjet printing equipment, so before controlling multiple second nozzles for simulated printing, the printing parameters of the upcoming formal inkjet printing can be obtained first. The specific printing parameters include at least ink droplet size, inkjet speed, inkjet pressure, inkjet path, the distance between the nozzle and the substrate, the number of inkjet prints in each pixel opening, etc.

[0120] Furthermore, in order to more realistically simulate formal inkjet printing, a second area 42 for simulated printing is provided on the detection substrate 40, and a thin film transistor and a plurality of pixel openings are provided in the second area 42, and the arrangement of the thin film transistor and the pixel opening can be the same as that of the glass substrate during formal inkjet printing. When controlling the plurality of second nozzles to perform simulated printing in the second area 42 of the detection substrate 40, the printing parameters of the inkjet printing can be obtained first, and then the plurality of second nozzles can be controlled to drip ink into the plurality of pixel openings of the second area 42 according to the printing parameters, so that a more realistic inkjet printing process can be simulated.

[0121] Of course, because the arrangement of the thin film transistors and pixel openings in the second area 42 can be the same as that of the glass substrate during formal printing, after completing the nozzle screening, if the printing quality of the second area 42 meets the requirements, the first area 41 and the third area 43 of the detection substrate 40 can also be cut off. At this time, the detection substrate 40 can also be put into storage as a substrate with qualified printing quality.

[0122] At this point, through the above step S2, the simulated printing of multiple second nozzles is completed. After the simulated printing, the second nozzles that are unqualified or unstable but perform well in step S1 can be revealed, and then step S3 can be continued for further screening.

[0123] Step S3: controlling the plurality of second nozzles after the simulation printing to perform a second ink drop detection, and determining a plurality of target nozzles from the plurality of second nozzles.

[0124] In this application, if Figure 7 As shown, step S3 specifically includes:

[0125] Step S31: Control the plurality of second nozzles to drop a plurality of second ink drops on the detection substrate 40. Specifically, this step S31 is basically similar to step S11. After the simulation printing is completed, the plurality of second nozzles can be controlled to correspond to the third area 43 of the detection substrate 40, and the switches on the plurality of second nozzles can be controlled to be turned on, so that the plurality of second nozzles drop a plurality of second ink drops in the third area 43. Similarly, when controlling the plurality of second nozzles to drop the second ink drops, each second nozzle may drop one ink drop, which is the second ink drop; or each second nozzle may drop two or more ink drops at the same position, and the two or more ink drops form one second ink drop. The specific number of ink drops dropped by each second nozzle can be set according to the ink dropping condition of the nozzle during formal printing. For example, if the nozzle drops only one ink drop each time it passes through a pixel opening, the number of ink drops dropped by the second nozzle at the same position in the third area 43 can be one drop; and if the first nozzle drops two ink drops each time it passes through a pixel opening, the number of ink drops dropped by the second nozzle at the same position in the third area 43 can also be two drops. It can be understood that this can make the ink jetting state of the nozzle during screening closer to the ink jetting state during formal printing, which is more conducive to improving the screening effect.

[0126] Step S32: Obtain the second characteristic parameter of the second ink droplet. Specifically, this step S32 is basically similar to step S12, that is, the detection device 30 can capture the image of the second ink droplet through the camera, and the processing module can process the image of the second ink droplet and output the second characteristic parameter of the second ink droplet. The second characteristic parameter of the second ink droplet includes a second actual position and a second actual area. The method for determining the second actual position and the method for calculating the second actual area can refer to the introduction of the first actual position and the first actual area in the previous text, and will not be described in detail here.

[0127] Step S33: determining a plurality of target nozzles from the plurality of second nozzles according to the second characteristic parameter. Figure 8 As shown, this step S33 specifically includes:

[0128] Step S331: Acquire the second target position of the second ink droplet. Specifically, similar to step S131, in this step, the second virtual coordinates corresponding to the first nozzle in the virtual coordinate system may be acquired first, and then the second virtual coordinates may be determined as the second target position.

[0129] Step S332: Determine a second offset of the second actual position relative to the second target position. This step S332 is substantially similar to step S132, and specifically includes:

[0130] Step S3321: Acquire the second actual coordinates corresponding to the second actual position in the virtual coordinate system;

[0131] Step S3322: Determine the second offset according to the second actual coordinate and the second virtual coordinate.

[0132] Specifically, after the detection device 30 captures the image of the second ink droplet, the image with the second ink droplet can be output to the control device. The control device aligns the image with the second ink droplet to the virtual coordinate system, and then obtains the second actual coordinate corresponding to the second actual position. At this time, the difference between the second actual coordinate and the second virtual coordinate is calculated, so that the second offset of the second actual position relative to the second target position can be determined more conveniently.

[0133] It should be noted that the second offset can be the straight-line distance between the second actual position and the second target position, or can be split into an offset in the X-axis direction and an offset in the Y-axis direction. The specific data form can be flexibly selected according to actual conditions.

[0134] Step S333: Calculate the offset difference between the first offset and the second offset, and the area difference between the first actual area and the second actual area.

[0135] Step S334: when the offset difference is less than or equal to the second reference value, and the area difference is less than or equal to the third reference value, determining that the corresponding second ink droplet is a second target ink droplet.

[0136] Step S335: determining that the second nozzle corresponding to the second target ink droplet is the target nozzle.

[0137] Specifically, different from step S133 to step S134, in step S333 to step 335, the first offset determined in step 13 and the first actual area determined in step S12 are first obtained, and then the offset difference between the first offset and the second offset and the area difference between the first actual area and the second actual area are calculated, and then the offset difference is compared with the second reference value and the area difference is compared with the third reference value. When the offset difference is less than or equal to the second reference value and the area difference is less than or equal to the third reference value, the corresponding second ink droplet can be determined to be the second target ink droplet, and the second nozzle corresponding to the second target ink droplet can be determined to be the target nozzle.

[0138] It should be noted that the reason for calculating the offset difference and the area difference is that the second nozzle that has been screened is used to print the second ink droplet, and the second nozzle is screened out from multiple nozzles based on the screening criteria of "the offset is less than the first reference value, and the first actual area is within the preset range". If the second offset of the second ink droplet is still compared with the first reference value, and the second actual area of ​​the second ink droplet is still compared with the preset reference range, it may result in that basically all the second nozzles can be determined as the target nozzles for formal printing, thus failing to improve the screening effect.

[0139] By calculating the offset difference and the area difference, the state stability of the same second nozzle before and after the simulation of formal inkjet printing can be determined, and the second nozzle that is not stable enough can be discovered in time and closed or removed, leaving the second nozzle in good and stable state as the target nozzle for formal inkjet printing, which can effectively improve the printing quality.

[0140] In order to reduce the amount of calculation, in one embodiment, the offset difference includes a longitudinal offset difference and a lateral offset difference, and the second reference value includes a second longitudinal reference value and a second lateral reference value. The "longitudinal and lateral" defined in this embodiment can be one of the Y-axis and the other of the X-axis. Similarly, the second reference value also adaptively includes a second longitudinal reference value and a second lateral reference value. Therefore, when the longitudinal offset difference is less than or equal to the second longitudinal reference value, the lateral offset difference is less than or equal to the second lateral reference value, and the area difference is less than or equal to the third reference value, the corresponding second ink droplet is determined to be a second target ink droplet, and the second nozzle corresponding to the second target ink droplet is a target nozzle.

[0141] It should also be noted that the specific values ​​of the second reference value and the third reference value can be set according to the actual nozzle size, the moving speed of the nozzle during inkjet printing, the ink type, etc. For example, in the present application, the second longitudinal reference value is greater than or equal to 1 micron and less than or equal to 5 microns, that is, the specific value of the first longitudinal reference value can be 1 micron, 1.5 microns, 2 microns, 2.5 microns, 3 microns, 35 microns, 4 microns, 4.5 microns, 5 microns, etc. The first transverse reference value is greater than or equal to 3 microns and less than or equal to 7 microns, that is, the specific value of the second longitudinal reference value can be 3 microns, 3.5 microns, 4 microns, 4.5 microns, 5 microns, 5.5 microns, 6 microns, 6.5 microns, 7 microns, etc.

[0142] The lower limit of the preset reference range is greater than or equal to 100 square microns, and the upper limit is less than or equal to 150 square microns. The specific preset reference range can be 100 square microns to 150 square microns, 100 square microns to 145 square microns, 100 square microns to 140 square microns, 100 square microns to 135 square microns, 100 square microns to 130 square microns, 100 square microns to 125 square microns, 100 square microns to 120 square microns, 100 square microns to 115 square microns, 100 square microns to 110 square microns, 115 square microns to 150 square microns, 115 square microns to 145 square microns, 115 square microns to 140 square microns, 115 square microns to 135 square microns, 115 square microns to 130 square microns m, 115 square microns to 125 square microns, 115 square microns to 120 square microns, 120 square microns to 150 square microns, 120 square microns to 145 square microns, 120 square microns to 140 square microns, 120 square microns to 135 square microns, 120 square microns to 130 square microns, 120 square microns to 125 square microns, 130 square microns to 150 square microns, 130 square microns to 145 square microns, 130 square microns to 140 square microns, 130 square microns to 135 square microns, 135 square microns to 150 square microns, 135 square microns to 145 square microns, 135 square microns to 140 square microns, 140 square microns to 150 square microns, 140 square microns to 145 square microns and so on.

[0143] More specifically, in one embodiment of the present application, the specific value of the first longitudinal reference value is 7.5 microns, the specific value of the second longitudinal reference value is 10 microns, and the specific preset reference range is 1300 square microns to 1500 square microns. Therefore, when the longitudinal offset difference is less than or equal to 3 microns, the lateral offset difference is less than or equal to 5 microns, and the area difference is less than or equal to 150 square microns, the corresponding second ink droplet is determined to be the second target ink droplet, and the second nozzle corresponding to the second target ink droplet is the target nozzle.

[0144] Among them, for the method of determining the longitudinal offset difference and the lateral offset difference, in this embodiment, the second offset includes a second longitudinal offset and a second lateral offset. At this time, the absolute value of the difference between the first longitudinal offset and the second longitudinal offset can be determined as the longitudinal offset difference, and the absolute value of the difference between the first lateral offset and the second lateral offset can be determined as the longitudinal offset difference.

[0145] In summary, it can be understood that the nozzle control method provided in the present application includes two screening actions and simulated printing interspersed between the two screening actions. It can be understood that by performing screening again after simulated printing, nozzles that did not show abnormalities in the first screening but showed abnormalities during the printing process can be discovered in time, and then the nozzles with abnormal conditions can be eliminated through the second screening, thereby improving the nozzle screening effect and better ensuring the printing quality.

[0146] At this point, after screening through the above steps S1 to S3, the target nozzle that meets the requirements is determined, and then the target nozzle is controlled to perform inkjet printing on the substrate to be printed according to the preset printing parameters.

[0147] Optionally, in one embodiment, as Figure 2 As shown, the detection substrate 40 is provided with at least two first areas 41, and the step of controlling the plurality of first nozzles to drip a plurality of first ink droplets in the first area 41 of the detection substrate 40 includes: controlling each of the first nozzles to drip the first ink droplets in each of the first areas 41. That is, each first nozzle will drip ink at least twice at at least two different positions, and because each first ink droplet will be obtained with a first characteristic parameter, and each first characteristic parameter will be used to determine whether the corresponding first nozzle meets the requirements. In other words, because each first nozzle drips ink at least twice in at least two first areas 41, before executing step S2 (i.e. controlling the plurality of second nozzles to perform simulated printing), each first nozzle performs at least two ink droplet detections, which can avoid the situation where some nozzles with abnormal status just do not show abnormality during the first screening and are then determined as first nozzles, thereby helping to improve the screening effect.

[0148] Alternatively, in another embodiment, the first area 41 may not be provided with a plurality of nozzles, but when the area of ​​the first area 41 is sufficient, each of the first nozzles is controlled to drop the first ink droplets at at least two different positions in the first area 41. In this way, before executing step S2 (i.e., controlling a plurality of the second nozzles to perform simulated printing), each first nozzle is tested for ink droplets at least twice, thereby avoiding the situation where some nozzles with abnormal status just do not show abnormality during the first screening and are determined as first nozzles, which is conducive to improving the screening effect.

[0149] Optionally, in one embodiment, as Figure 2As shown, the detection substrate 40 is provided with at least two third areas 43, and the step of controlling the plurality of second nozzles to drip a plurality of second ink drops in the third area 43 of the detection substrate 40 includes: controlling each of the second nozzles to drip the second ink droplets in each of the third areas 43. That is, each second nozzle will drip ink at least twice at at least two different positions, and because each second ink droplet will be obtained with a second characteristic parameter, and each second characteristic parameter will be used to determine whether the corresponding nozzle meets the requirements. In other words, because each second nozzle drips ink at least twice in at least two third areas 43, each second nozzle is tested for ink dripping at least twice before the target nozzle for formal inkjet printing is finally determined, so that the situation that some second nozzles with abnormal status just do not show abnormality when only one screening is performed and are then determined as target nozzles can be avoided, which is conducive to improving the screening effect and ensuring the printing effect.

[0150] Alternatively, in another embodiment, the second area 42 may not be provided with a plurality of second areas, but when the area of ​​the second area 42 is sufficient, each of the second nozzles is controlled to drop the second ink droplets at at least two different positions in the third area 43. In this way, before finally determining the target nozzle for formal inkjet printing, each second nozzle is tested for ink droplets at least twice, thereby avoiding the situation where some second nozzles with abnormal status just do not show abnormality in only one screening and are determined as target nozzles, thereby helping to improve the screening effect and ensure the printing effect.

[0151] like Figure 1 As shown, the present application proposes an inkjet printing device 100, which includes a carrier 10, an inkjet device 20, a control device (not shown) and a detection device 30, wherein the carrier 10 is at least used to detect the substrate 40, and when performing formal inkjet printing, the carrier is also used to carry the formally printed substrate, the inkjet device 20 is provided with a print head 21, and the print head 21 is provided with a plurality of nozzles, the control device is at least used to control the plurality of nozzles to provide ink to the detection substrate to form ink droplets, so as to perform ink drop detection and simulated printing, and the detection device 30 is mainly a camera, which is used to detect ink droplets on the substrate and output the detection results to the control device.

[0152] The control device further includes a screening module, which mainly includes a nozzle controller, which can close unqualified nozzles according to the detection results, and then screen out target nozzles for formal inkjet printing. The specific screening method is the nozzle screening direction introduced above, and the nozzle control method can be pre-stored in the memory of the control device.

[0153] It should be noted that the specific structure, installation method, positional relationship, etc. of the support platform 10, inkjet device 20, control device and detection device 30 can be implemented according to relevant existing technologies as long as the corresponding functions introduced above can be achieved.

[0154] In addition, in one embodiment of the present application, the control device also establishes a virtual coordinate system, and the inkjet printing device 100 also includes a positioning device, which is used to align the detection substrate 40 and the nozzle to the virtual coordinate system.

[0155] Specifically, when the detection substrate 40 is positioned on the carrier platform 10, the control device can detect the size and position of the entire detection substrate 40 through the detection device 30, and then establish a corresponding virtual coordinate system for the area where the detection substrate 40 is located. The virtual coordinate system can be two-dimensional or three-dimensional, and can be specifically established according to printing requirements.

[0156] The alignment device is mainly composed of a series of sensors (such as photoelectric sensors, mechanical sensors, Hall sensors, etc.) to sense the actual positions of the nozzle and the detection substrate 40, and align the detection substrate 40 and the nozzle to the virtual coordinate system according to the preset alignment mark 44 on the detection substrate 40. For example, the alignment mark 44 on the detection substrate 40 is first aligned to the origin of the virtual coordinate system, and then according to the positions of other positions of the detection substrate 40 relative to the alignment mark 44, and the positions of the nozzle relative to the alignment mark 44, the other positions of the detection substrate 40 and the nozzle are aligned one by one to the virtual coordinate system.

[0157] By aligning the detection substrate 40 and the nozzles in a virtual coordinate system through the alignment device, the control device can accurately control multiple nozzles to perform ink drop detection or simulate printing at accurate positions, and conveniently calculate the offset of the ink droplets.

[0158] Optionally, in one embodiment, as Figure 2 As shown, the detection substrate 40 has a first area 41, a second area 42 and a third area 43. The surfaces of the first area 41 and the third area 43 are both planes, and a plurality of pixel openings are provided in the second area 42. The control device is at least used to control a plurality of nozzles to provide ink to form ink droplets to the first area 41, the second area 42 and the third area 43. The detection device 30 is used to detect the ink droplets on the first area 41 and the third area 43.

[0159] The above is a detailed introduction to a nozzle control method, a storage medium, an inkjet printing device and a control device thereof provided in an embodiment of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A nozzle control method, characterized in that: include: Controlling a plurality of first nozzles to perform a first ink drop detection, and determining a plurality of second nozzles from the plurality of first nozzles; Controlling the plurality of second nozzles to perform simulated printing; The plurality of second nozzles after the simulation printing are controlled to perform a second ink drop detection, and a target nozzle is determined from the plurality of second nozzles.

2. The nozzle control method according to claim 1, characterized in that: The step of controlling the plurality of first nozzles to perform the first ink drop detection and determining the plurality of second nozzles from the plurality of first nozzles comprises: Controlling the plurality of first nozzles to drop a plurality of first ink drops on the detection substrate; Obtaining a first characteristic parameter of the first ink droplet; A plurality of second nozzles are determined from the plurality of first nozzles according to the first characteristic parameter.

3. The nozzle control method according to claim 2, characterized in that: The first characteristic parameter includes a first actual position and a first actual area, and the step of determining a plurality of second nozzles from the plurality of first nozzles according to the first characteristic parameter includes: Acquire a first target position of the first ink droplet; determining a first offset of the first actual position relative to the first target position; When the first offset is less than or equal to a first reference value and the first actual area is within a preset reference range, determining that the corresponding first ink droplet is a first target ink droplet; The first nozzle corresponding to the first target ink droplet is determined to be the second nozzle.

4. The nozzle control method according to claim 3, characterized in that: The detection substrate is provided with an alignment mark, and the step of obtaining the first target position of the first ink droplet includes: Aligning the inspection substrate to a preset virtual coordinate system according to the alignment mark; Acquire a first virtual coordinate corresponding to the first nozzle in the virtual coordinate system; Determining the first virtual coordinate as the first target position; The step of determining a first offset of the first actual position relative to the first target position comprises: Acquire a first actual coordinate corresponding to the first actual position in the virtual coordinate system; The first offset is determined according to the first actual coordinate and the first virtual coordinate.

5. The nozzle control method according to claim 3, characterized in that: The first offset includes a first longitudinal offset and a first lateral offset, and the first reference value includes a first longitudinal reference value and a first lateral reference value; When the first longitudinal offset is less than or equal to a first longitudinal reference value, the first lateral offset is less than or equal to a first lateral reference value, and the first actual area is within a preset reference range, the corresponding first ink drop is determined to be a first target ink drop.

6. The nozzle control method according to claim 5, characterized in that: The first longitudinal reference value is greater than or equal to 5 microns and less than or equal to 10 microns, and the first transverse reference value is greater than or equal to 8 microns and less than or equal to 12 microns; the lower limit value of the preset reference range is greater than or equal to 1300 square microns, and the upper limit value is less than or equal to 1500 square microns.

7. The nozzle control method according to claim 1, characterized in that: The step of controlling the plurality of second nozzles to perform simulated printing comprises: Get the printing parameters of inkjet printing; The plurality of second nozzles are controlled to perform simulated printing on the detection substrate according to the printing parameters.

8. The nozzle control method according to claim 3, characterized in that: The step of controlling the plurality of second nozzles after the simulation printing to perform a second ink drop detection and determining a plurality of target nozzles from the plurality of second nozzles comprises: Controlling the plurality of second nozzles to drop a plurality of second ink drops on the detection substrate; obtaining a second characteristic parameter of the second ink droplet; A plurality of target nozzles are determined from the plurality of second nozzles according to the second characteristic parameter.

9. The nozzle control method according to claim 8, characterized in that: The second characteristic parameter includes a second actual position and a second actual area, and the step of determining a plurality of target nozzles from the plurality of second nozzles according to the second characteristic parameter includes: Acquire a second target position of the second ink droplet; determining a second offset of the second actual position relative to the second target position; Calculating an offset difference between the first offset and the second offset, and an area difference between the first actual area and the second actual area; When the offset difference is less than or equal to a second reference value, and the area difference is less than or equal to a third reference value, determining that the corresponding second ink droplet is a second target ink droplet; The second nozzle corresponding to the second target ink droplet is determined as the target nozzle.

10. The nozzle control method according to claim 9, characterized in that: The detection substrate is provided with an alignment mark, and the step of obtaining the second target position of the second ink droplet includes: Aligning the inspection substrate to a preset virtual coordinate system according to the alignment mark; Acquire a second virtual coordinate corresponding to the first nozzle in the virtual coordinate system; determining the second virtual coordinate as the second target position; The step of determining a second offset of the second actual position relative to the second target position comprises: Acquire a second actual coordinate corresponding to the second actual position in the virtual coordinate system; The second offset is determined according to the second actual coordinate and the second virtual coordinate.

11. The nozzle control method according to claim 9, characterized in that: The offset difference includes a longitudinal offset difference and a lateral offset difference, and the second reference value includes a second longitudinal reference value and a second lateral reference value; When the longitudinal offset difference is less than or equal to a second longitudinal reference value, the lateral offset difference is less than or equal to a second lateral reference value, and the area difference is less than or equal to a third reference value, the corresponding second ink drop is determined to be a second target ink drop.

12. The nozzle control method according to claim 11, characterized in that: The first offset includes a first longitudinal offset and a first lateral offset, and the second offset includes a second longitudinal offset and a second lateral offset; Determine the absolute value of the difference between the first longitudinal offset and the second longitudinal offset as the longitudinal offset difference; The absolute value of the difference between the first lateral offset and the second lateral offset is determined as the longitudinal offset difference.

13. The nozzle control method according to claim 11, characterized in that: The second longitudinal reference value is greater than or equal to 1 micrometer and less than or equal to 5 micrometers, the second lateral reference value is greater than or equal to 3 micrometers and less than or equal to 7 micrometers, and the third reference value is greater than or equal to 100 square micrometers and less than or equal to 150 square micrometers.

14. The nozzle control method according to any one of claims 1 to 13, characterized in that: Controlling the plurality of first nozzles to perform a first ink drop detection in a first area of ​​a detection substrate, controlling the plurality of second nozzles to perform simulated printing in a second area of ​​the detection substrate, and controlling the plurality of second nozzles to perform a second ink drop detection in a third area of ​​the detection substrate; The surfaces of the first area and the third area are both planes, and a plurality of pixel openings are disposed in the second area.

15. The nozzle control method according to claim 14, characterized in that: The detection substrate is provided with at least two first areas, and the step of controlling a plurality of first nozzles to perform a first ink drop detection in the first area of ​​the detection substrate comprises: Controlling each of the first nozzles to drop a first ink droplet in each of the first regions, or controlling each of the first nozzles to drop a first ink droplet at at least two different positions in the first region; And / or, the detection substrate is provided with at least two third areas, and the step of controlling the plurality of second nozzles to perform the second ink drop detection in the third area of ​​the detection substrate includes: Control each of the second nozzles to drop a second ink droplet in each of the third regions, or control each of the second nozzles to drop a second ink droplet at at least two different positions in the third region; And / or, the step of controlling the plurality of second nozzles to perform simulated printing in the second area of ​​the detection substrate includes: Get the printing parameters of inkjet printing; controlling the plurality of second nozzles to drop ink into the plurality of pixel openings according to the printing parameters; And / or, after determining the target nozzle, controlling the target nozzle to perform inkjet printing on the substrate to be printed.

16. An inkjet printing device, characterized in that: include: A carrying platform, the carrying platform is used at least to carry a detection substrate; An inkjet device, wherein the inkjet device is provided with a plurality of nozzles; A control device, the control device is at least used to control the plurality of nozzles to provide ink to the detection substrate to form ink droplets; as well as, A detection device, the detection device is at least used to detect ink droplets on the detection substrate and output the detection result to the control device; Wherein, the control device comprises a screening module, and the screening module is used to screen the nozzles according to the detection result.

17. The inkjet printing device according to claim 16, wherein: The control device also establishes a virtual coordinate system, and the inkjet printing device also includes an alignment device, which is used to align the detection substrate and the nozzle to the virtual coordinate system; and / or The detection substrate has a first area, a second area and a third area, the surfaces of the first area and the third area are both planes, and a plurality of pixel openings are arranged in the second area; The control device is at least used to control the plurality of nozzles to provide ink to the first area, the second area and the third area to form ink droplets; The detection device is used to detect ink drops on the first area and the third area.

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