CN113771518A - Ink jet printing method and ink jet printing apparatus - Google Patents

Ink jet printing method and ink jet printing apparatus Download PDF

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Publication number
CN113771518A
CN113771518A CN202111061866.XA CN202111061866A CN113771518A CN 113771518 A CN113771518 A CN 113771518A CN 202111061866 A CN202111061866 A CN 202111061866A CN 113771518 A CN113771518 A CN 113771518A
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China
Prior art keywords
volume
image data
ink
test pattern
pattern
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CN202111061866.XA
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Chinese (zh)
Inventor
黄辉
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TCL China Star Optoelectronics Technology Co Ltd
TCL Huaxing Photoelectric Technology Co Ltd
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TCL Huaxing Photoelectric Technology Co Ltd
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Priority to CN202111061866.XA priority Critical patent/CN113771518A/en
Publication of CN113771518A publication Critical patent/CN113771518A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/0041—Digital printing on surfaces other than ordinary paper
    • B41M5/0047—Digital printing on surfaces other than ordinary paper by ink-jet printing
    • 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
    • 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
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
    • B41J29/393—Devices for controlling or analysing the entire machine ; Controlling or analysing mechanical parameters involving printing of test patterns
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
    • H10K71/10—Deposition of organic active material
    • H10K71/12—Deposition of organic active material using liquid deposition, e.g. spin coating
    • H10K71/13—Deposition of organic active material using liquid deposition, e.g. spin coating using printing techniques, e.g. ink-jet printing or screen printing
    • H10K71/135—Deposition of organic active material using liquid deposition, e.g. spin coating using printing techniques, e.g. ink-jet printing or screen printing using ink-jet printing

Abstract

The application provides an inkjet printing method and an inkjet printing apparatus. The inkjet printing method includes: providing a first test substrate, and carrying out ink-jet printing on the first test substrate according to the preset ink drop quantity to obtain a first test pattern; acquiring first image data of the first test pattern, and calculating the volume of the first test pattern according to the relationship between the first image data and the volume of a prestored first image data of a reference pattern; calculating the volume of a single drop of the ink droplets according to the volume of the first test pattern and the preset number of the ink droplets, and calculating the number of the target ink droplets according to the volume of the single drop of the ink droplets and the target printing volume; and providing a target substrate, and performing ink jet printing on the target substrate according to the target ink drop quantity. According to the ink-jet printing method, the actual volume of the ink drop printed by the nozzle can be corrected, and the printing precision is improved.

Description

Ink jet printing method and ink jet printing apparatus
Technical Field
The present disclosure relates to inkjet printing technologies, and particularly to an inkjet printing method and an inkjet printing apparatus.
Background
Ink Jet Printing (IJP) technology is widely used in the manufacture of Organic Light-Emitting Diode (OLED) display devices. Before formal printing, preliminary ink jetting is required, and the number of ink drops used when one pixel is printed is determined.
One method known is the weighing method. Because the individual drop volume of an ink drop is small and cannot be weighed efficiently, the weighing method does not focus on the actual volume size of each drop, but rather finds the number of ink drops needed to print the total volume required for each pixel by summing the weights of multiple sets of drops. The deviation in drop ejection can produce large errors for very small drop sizes, such as 1PL (picoliter), resulting in actual drop sizes that are not consistent with the drop sizes required for printing. For example, 10 ink droplets are required for printing one pixel, the total volume is 50PL measured by a weighing method, but due to control error of a nozzle, the total volume obtained by printing 10 ink droplets is only 45PL, so that the printing precision of ink-jet printing is low.
Disclosure of Invention
In view of the above, the present application aims to provide an inkjet printing apparatus and an inkjet printing method capable of improving the printing accuracy of inkjet printing.
The present application provides an inkjet printing method, comprising:
providing a first test substrate, and carrying out ink-jet printing on the first test substrate according to the preset ink drop quantity to obtain a first test pattern;
acquiring first image data of the first test pattern, and calculating the volume of the first test pattern according to the relationship between the first image data and the volume of a prestored first image data of a reference pattern;
calculating the volume of a single drop of the ink droplets according to the volume of the first test pattern and the preset number of the ink droplets, and calculating the number of the target ink droplets according to the volume of the single drop of the ink droplets and the target printing volume;
and providing a target substrate, and performing ink jet printing on the target substrate according to the target ink drop quantity.
In one embodiment, the first image data of the first test pattern is an area of the first test pattern, and the first image data of the reference pattern is an area of the reference pattern.
In one embodiment, the relationship between the first image data of the reference pattern and the volume is a direct proportional relationship, the acquiring the first image data of the first test pattern, and the calculating the volume of the first test pattern according to the relationship between the first image data and the volume of the pre-stored reference pattern comprises:
calculating a scaling factor of an area of the first test pattern to an area of the reference pattern, a volume of the first test pattern being equal to a product of the scaling factor and a volume of the reference pattern.
In one embodiment, before the acquiring the first image data of the first test pattern and calculating the volume of the first test pattern according to the relationship between the first image data and the volume of the pre-stored first image data of the reference pattern, the method further includes:
providing a reference substrate, and carrying out ink-jet printing on the reference substrate to obtain a reference pattern;
acquiring first image data of the reference pattern;
measuring the film thickness of the reference pattern, and calculating the volume of the reference pattern according to the film thickness;
and calculating the relation between the first image data of the reference pattern and the volume according to the first image data of the reference pattern and the volume of the reference pattern, and pre-storing the relation between the first image data of the reference pattern and the volume.
In one embodiment, the providing a target substrate, before performing inkjet printing on the target substrate according to the target number of ink droplets, the inkjet printing method further includes:
providing a second test substrate, and establishing a coordinate system by taking the second test substrate as a reference;
inputting a nozzle coordinate, positioning the nozzle according to the nozzle coordinate, and performing ink-jet printing on the second test substrate to obtain a second test pattern;
acquiring second image data of the second test pattern, acquiring coordinates of the second test pattern from the second image data, and calculating a first difference value of the coordinates of the second test pattern and the coordinates of the nozzle on an X axis;
and adjusting the nozzle according to the first difference value so that the ink drop sprayed by the nozzle is positioned at a preset coordinate.
In one embodiment, the inkjet printing method further comprises:
acquiring a second difference value of the coordinate of the second test pattern and the coordinate of the nozzle on the Y axis by laser scanning;
adjusting the nozzle according to the first difference value so that the ink drop sprayed by the nozzle is positioned at a preset coordinate specifically comprises:
and adjusting the nozzle according to the first difference and the second difference so as to enable the ink drop sprayed by the nozzle to be positioned at a preset coordinate.
In one embodiment, the adjusting the nozzle to eject the ink droplet at the preset coordinate according to the first difference and the second difference comprises:
and adjusting the time and the volume of the ink drop ejected by the nozzle according to the first difference and the second difference.
In one embodiment, said capturing first image data of said first test pattern and said capturing second image data of said second test pattern are performed by the same image capturing component.
The present application also provides an inkjet printing apparatus, comprising:
the printing module is used for carrying out ink-jet printing on the first test substrate according to the preset ink drop quantity to obtain a first test pattern;
the image acquisition module is used for acquiring first image data of the first test pattern;
the calculation module is used for calculating the volume of the first test pattern according to the relationship between the first image data and the volume of the prestored first image data of the reference pattern, calculating the volume of a single drop of ink according to the volume of the first test pattern and the preset number of ink drops, and calculating the number of target ink drops according to the volume of the single drop of ink drops and the target printing volume;
and the printing module is also used for carrying out ink-jet printing on the target substrate according to the target ink drop quantity.
In one embodiment, the printing module is used for performing inkjet printing on a reference substrate to obtain a reference pattern;
the image acquisition module is used for acquiring first image data of the reference pattern;
the measuring module is used for measuring the film thickness of the reference pattern;
the calculation module is used for calculating the volume of the reference pattern according to the film thickness, calculating the relation between the first image data of the reference pattern and the volume according to the first image data of the reference pattern and the volume of the reference pattern,
the inkjet printing device further comprises a storage module, and the storage module is used for prestoring the relation between the first image data and the volume of the reference pattern.
The ink-jet printing method utilizes the image acquisition assembly to acquire the first image data of the first test pattern, calculates the volume of the first test pattern according to the relationship between the first image data of the first test pattern and the first image data of the pre-stored reference pattern and the volume, and calculates the volume of a single drop of the ink drop by dividing the volume of the first test pattern by the number of the preset ink drops. Thereby, the single drop volume of the ink droplet at the time of actual printing is calibrated. And dividing the target printing volume by the calibrated single drop volume of the ink drops to obtain the target ink drop number, and performing ink-jet printing on the target substrate according to the target ink drop number, so that the accurate printing volume and film thickness can be obtained, and the ink-jet printing precision is improved.
Drawings
In order to more clearly illustrate the technical solutions in the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic step diagram of a first embodiment of an inkjet printing method of the present application.
Fig. 2 is a schematic diagram illustrating a step of pre-storing a relationship between first image data of the reference pattern and a volume in the inkjet printing method of fig. 1.
Fig. 3 is a schematic diagram of a deviation of a preset position of an ink droplet from an actual position of the ink droplet in the inkjet printing method of the present application.
Fig. 4 is a schematic step diagram of a second embodiment of the inkjet printing method of the present application.
Fig. 5 is a schematic block diagram of a first structure of an inkjet printing apparatus according to the present application.
Fig. 6 is a block diagram schematically illustrating a second structure of the inkjet printing apparatus according to the present application.
Detailed Description
The technical solution in the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It should be apparent that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any inventive step based on the embodiments in the present application, are within the scope of protection of the present application.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise the first and second features directly, or may comprise the first and second features not being directly connected but being in contact with each other by means of further features between them. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The ink jet printing method and the ink jet printing device provided by the application can be used for ink jet printing in the display field. For example, it can be used for inkjet printing of OLED devices. Specifically, the ink can be used for ink jet printing of a hole injection layer, a hole transport layer, an organic light emitting layer, an electron injection layer, an electron transport layer, and the like of an OLED device, ink jet printing of a color film layer of an OLED device or a liquid crystal display, and the like. The inkjet printing method and inkjet printing apparatus of the present application will be described below by taking inkjet printing of pixels of an OLED device as an example.
Due to the precision limitation of the nozzles of the inkjet printing apparatus, there is an error between the actual volume printed by the nozzles and the set volume. Therefore, before the actual ink jet printing, it is generally necessary to perform ink-jet control before printing. The actual volume of printing of the nozzles is confirmed by print look-ahead ink control. Specifically, when printing targets (e.g., pixels) on a substrate (hereinafter, referred to as a target substrate) to be actually printed, a target printing volume is preset for each printing target according to the product requirements, and according to parameters such as the concentration and density of ink, the number of ink drops theoretically required for printing the target printing volume, that is, the theoretical number of ink drops, can be calculated. In practice, however, the number of drops required to print a target print volume may differ from the theoretical number of drops due to errors in the volume of drops printed by the nozzles. According to the embodiment of the application, the actual printing volume of the nozzle can be calibrated, and the number of ink drops required for printing the target printing volume can be calculated according to the actual printing volume of the nozzle.
Referring to fig. 1, a first embodiment of an inkjet printing method according to the present application includes:
step 101: providing a first test substrate, and carrying out ink-jet printing on the first test substrate according to the preset ink drop quantity to obtain a first test pattern.
In step 101, a first test substrate is provided having the same physical properties, e.g., material, roughness, as the target substrate, but a simpler structure than the target substrate. For example, the target substrate is a driving substrate of an OLED device, and the driving substrate of the OLED device includes a substrate, a driving element, and a pixel defining layer. The substrate may be glass, plastic, or a flexible substrate, etc. The driving element is disposed on the substrate, and the driving element may be a thin film transistor. The pixel definition layer covers the driving element, and a pixel definition opening is formed in the pixel definition layer. Whereas the first test substrate comprises only the substrate and the pixel defining layer. The substrate and the pixel defining layer are the same in material, position, structure and size (area and thickness, etc.) as the target substrate. And printing at a preset position of the first test substrate to obtain a first test pattern. In ink jet printing of an OLED device, the predetermined location is in the pixel defining opening. And printing at least one ink drop to fill the pixel defining opening, spreading the at least one ink drop in the pixel defining opening, and drying to obtain a first test pattern.
Step 102: and acquiring first image data of the first test pattern, and according to the relation between the first image data and the volume of a pre-stored reference pattern.
In step 102, the step of acquiring first image data of the first test pattern may be performed with an image acquisition component. The image capture component may be a Charge Coupled Device (CCD) image sensor. The step of acquiring the first image data of the first test pattern specifically includes: the CCD image sensor shoots at least one drop of ink drop to be spread in the pixel definition opening, the graph of the first test pattern is obtained after drying, and the first image data is obtained by measuring the collected image and then is output to the calculation module. The first image data may contain parameter information of a shape, an area, a diameter, a circumference, etc. of the first test pattern. Optionally, the first image data is parameter information related to an area of the first test pattern.
The relationship of the first image data of the pre-stored reference pattern to the volume may be represented by a functional expression. For example, if the first image data of the reference pattern is the area of the reference pattern represented by S0 and the volume is represented by V0, then V0 ═ f (S0); the first image data of the reference pattern is represented by R0 for the diameter of the reference pattern and V0 for the volume, and V0 is f' (R0). It is understood that the functional formula differs depending on the type of the first image data, and therefore, the functional formula will not be described in detail in the present application. The relationship between the first pattern data and the volume of the first test pattern printed by the same ink jet printing apparatus can be expressed by the functional expression. That is, if the area of the first image data of the first test pattern as the reference pattern is denoted by S1 and the volume is denoted by V1, V1 is f (S1). The first image data of the first test pattern is such that the diameter of the first test pattern is denoted by R1, and the volume is denoted by V1, then V1 ═ f' (R1). The actual volume of the first test pattern can be calculated by substituting the acquired first image data of the first test pattern into a functional expression V1 ═ f (S1) or V1 ═ f' (R1) indicating the relationship between the first image data of the pre-stored reference pattern and the volume.
Optionally, the first image data of the first test pattern is an area of the first test pattern, and the first image data of the reference pattern is an area of the reference pattern. In a more specific embodiment, the first image data of the reference pattern is in a directly proportional relationship with the volume, i.e., V0 ═ k0 × S0. The functional expression of the first image data of the first test pattern as a function of volume is also a direct proportional function, i.e. V1 ═ k0 × S1. Then, step 102 specifically includes: calculating a scaling factor of an area of the first test pattern to an area of the reference pattern, a volume of the first test pattern being equal to a product of the scaling factor and a volume of the reference pattern. The scaling factor of the area of the first test pattern to the area of the reference pattern is the calibration factor of the actual volume to the volume of the reference pattern. Specifically, the area of the first test pattern is denoted by S1, and if the proportionality coefficient k between the area S1 of the first test pattern and the area S0 of the reference pattern is S1/S0, the volume V1 of the first test pattern is V0.
The first image data of the first test pattern and the first image data of the reference pattern are the same kind of parameters. For example, in other embodiments, the first image data of the first test pattern is the diameter or perimeter of the first test pattern, and correspondingly, the first image data of the reference pattern is the diameter or perimeter of the reference pattern.
Step 103: and calculating the volume of a single drop of the ink drops according to the volume of the first test pattern and the preset number of the ink drops, and calculating the number of the target ink drops according to the volume of the single drop of the ink drops and the target printing volume.
In step 103, the drop volume is equal to the volume of the first test pattern divided by the preset number of drops. The target number of ink drops is equal to the target print volume divided by the ink drop single drop volume.
Step 104: and providing a target substrate, and performing ink jet printing on the target substrate according to the target ink drop quantity.
In step 104, a preset number of ink drops are printed in each pixel-defining opening to obtain a print target. During printing, the preset volume of a single drop of the ink drop is the same as the preset volume of a single drop when the first test pattern is printed, so that the actual volume of a single drop of the ink drop ejected by the nozzle is the same as the actual volume when the first test pattern is printed.
Optionally, in order to provide the relationship between the first image data of the reference pattern and the volume, before step 102, the method further includes:
step 105: the relationship of the first image data of the reference pattern to the volume is pre-stored.
Referring to fig. 2, step 105 specifically includes:
step 1051: and providing a reference substrate, and carrying out ink-jet printing on the reference substrate to obtain a reference pattern.
In step 1051, the reference substrate is the same substrate as the first test substrate. The method of ink jet printing on the reference substrate to obtain the reference pattern is also the same as the method of ink jet printing on the first test substrate to obtain the first test pattern. Here, the description thereof is omitted.
Step 1052: first image data of the reference pattern is acquired.
In step 1052, the acquired first image data of the reference pattern is also the same as the first image data on the first test substrate, and the method of acquisition is also the same.
Step 1053: and measuring the film thickness of the reference pattern, and calculating the volume of the reference pattern according to the film thickness.
In step 1053, the volume of the reference pattern can be calculated based on the film thickness of the reference pattern, the shape of the ink drop, the density and density of the ink, and the area of the pixels on the first test substrate. Therefore, by measuring the film thickness of the reference pattern, the volume of the reference pattern can be calculated. The formula of the calculation is different according to different printing conditions, and the method for calculating the volume is not described in detail in the application.
Step 1054: and calculating the relation between the first image data of the reference pattern and the volume of the reference pattern according to the first image data of the reference pattern and the volume of the reference pattern, and pre-storing the relation between the first image data of the reference pattern and the volume of the reference pattern.
Optionally, the first image data of the reference pattern is an area of the reference pattern. From the volume of the reference pattern and the area of the reference pattern, a functional relationship between the volume of the reference pattern and the area of the reference pattern can be fitted. In a specific embodiment, the volume of the reference pattern is in a direct proportional relationship with the area of the reference pattern.
The ink-jet printing method utilizes the image acquisition assembly to acquire the first image data of the first test pattern, calculates the volume of the first test pattern according to the relationship between the first image data of the first test pattern and the first image data of the pre-stored reference pattern and the volume, and calculates the volume of a single drop of the ink drop by dividing the volume of the first test pattern by the number of the preset ink drops. Thereby, the single drop volume of the ink droplet at the time of actual printing is calibrated. And dividing the target printing volume by the calibrated single drop volume of the ink drops to obtain the target ink drop number, and performing ink-jet printing on the target substrate according to the target ink drop number, so that the accurate printing volume and film thickness can be obtained, and the ink-jet printing precision is improved.
In one embodiment, the image capture assembly captures first image data that outputs a first test pattern, and the actual volume of ink drops of the first test pattern can be calculated by a scaling factor of the area of the reference pattern to the first test pattern.
In the above, the step of calibrating the actual volume of the ink droplet is described, and in the following, the step of calibrating the actual position of the ink droplet is described. The nozzle printing in an inkjet printing device is spaced at millisecond intervals, and the positions of ink drops printed at different time points are different for the same nozzle, and the ink ejection volume of the nozzle also influences the positions of the ink drops. That is, the printing time and the ink ejection volume cause an error between the position of the ink droplet printed by the nozzle and the set position. Before the actual ink jet printing is performed, the actual positions of ink droplets printed by the nozzles can be confirmed by the pre-printing ink-viewing control.
In the ink-viewing control before printing, a direct measurement method is known, which can observe parameters such as the volume, speed, and angle of a fixed droplet. The direct measurement method also has a problem that the observed droplet size is not consistent with the actual size. Of course, this problem can be solved by the above-described procedure. In the direct measurement method, the actual position of the ink droplet may be measured using a laser, thereby calculating the positional deviation of the ink droplet. However, since the laser measuring assembly is arranged in only one direction in the existing device, the position deviation of the ink drop in only one direction can be measured, and the position deviation of the ink drop in the other direction cannot be measured.
In order to solve the problem that the position deviation of the ink drop in only one direction can be measured in the direct measurement method, optionally, before step 104, the inkjet printing method of the present application further includes:
step 106: and providing a second test substrate, and establishing a coordinate system by taking the second test substrate as a reference.
The second test substrate may be the same substrate as the first test substrate, or the second test substrate and the first test substrate may be the same substrate. That is, step 106 and subsequent steps are performed on the first test substrate. Step 106 may specifically include: the second test substrate is placed on the base with the symmetry axis of the second test substrate in the horizontal direction as the X-axis, the symmetry axis of the second test substrate in the vertical direction as the Y-axis, or one side of the second test substrate in the vertical direction as the Y-axis. It should be noted that the X-axis and the Y-axis are defined by the user and do not represent the limitation of the directions.
Step 107: and inputting a nozzle coordinate, positioning the nozzle according to the nozzle coordinate, and performing ink-jet printing on the second test substrate to obtain a second test pattern.
Alternatively, the nozzle coordinates may be preset coordinates of ink droplets for ink jet printing. The nozzle coordinates may also be adjacent or close to the preset coordinates of the ink droplets of the ink jet printing, taking into account the actual printing situation. And performing ink-jet printing on the second test substrate to obtain a second test pattern in the same way as performing ink-jet printing on the first test substrate to obtain the first test pattern. Here, the description thereof is omitted.
Step 108: acquiring second image data of the second test pattern, acquiring coordinates of the second test pattern from the second image data, and calculating a first difference value of the coordinates of the second test pattern and the coordinates of the nozzle on the X axis.
The coordinates of the second test pattern may be the coordinates of the center thereof. And acquiring second image data of the second test pattern, wherein the second image information comprises coordinate information of the second test pattern. Specifically, the coordinates of the second test pattern may be obtained by matching the photographed pattern of the second test pattern with the coordinate system established in step 106. Specifically, assuming that the nozzle coordinates are (a0, b0) and the coordinates of the second test pattern included in the second image data are (a1, b1), the first difference d1 between the coordinates of the second test pattern and the nozzle coordinates on the X axis is a1-a 0. Taking fig. 3 as an example, the Ink drops that are ordered to be printed by the inkjet head 100 are denoted by Ink1 generation, the Ink drops that are actually printed are denoted by Ink2, and the image capture assembly 200 is used to capture images of the Ink drops. When d1 > 0, it indicates that the ink drop is positioned to the right, and vice versa.
Step 109: and adjusting the nozzle according to the first difference value so that the ink drop sprayed by the nozzle is positioned at a preset coordinate.
In step 109, when d1 > 0, indicating that the ink droplet is located on the right side, the nozzle is adjusted so that the ink droplet ejected from the nozzle moves to the left. And vice versa.
Optionally, steps 106 to 109 may be performed after step 101, or may be performed after step 103 and before step 104. Steps 106 to 109 may also be performed simultaneously with steps 101 and 103, in which case the actual volume and position of the ink drops are corrected simultaneously.
Since the position of the ink drop is related to the time and volume of the ejected ink drop. In step 109, the adjusting the nozzle according to the first difference and the second difference so that the ink droplet ejected from the nozzle is located at the preset coordinate includes:
and adjusting the time and the volume of the ink drop ejected by the nozzle according to the first difference and the second difference.
It is understood that, in the case where the volume of the ink droplets ejected from the nozzles is adjusted in step 109, steps 106 to 109 are performed before steps 101 to 103 to determine the preset volume of the ink droplets, and then the actual volume is measured to calculate the number of printing target ink droplets.
Optionally, the acquiring the second image data of the first test pattern and the acquiring the second image data of the second test pattern are performed by the same image acquisition component.
According to the ink-jet printing method, the image acquisition assembly can be used for acquiring the second image data of the second test pattern to measure the actual dropping position of the ink drop which is pre-jetted, the deviation of the actual dropping position of the ink drop and the preset position on the X axis is calculated, and the nozzle is adjusted according to the deviation, so that the ink drop jetted by the nozzle is dropped on the preset position, and the ink-jet printing accuracy is improved.
Optionally, between step 107 and step 109, the method may further include:
step 1010: and acquiring a second difference value of the coordinate of the second test pattern and the coordinate of the nozzle on the Y axis by using laser scanning. Taking fig. 3 as an example, a laser 300 is used to capture the Y-axis coordinates of the ink drops.
Then, step 109 specifically includes:
and adjusting the nozzle according to the first difference and the second difference so as to enable the ink drop sprayed by the nozzle to be positioned at a preset coordinate. A second difference d2 between the coordinates of the second test pattern and the coordinates of the nozzle on the Y-axis is b1-b 0. When d2 > 0, indicating that the ink droplet is located at an upper position, the nozzle is adjusted so that the ink droplet ejected from the nozzle moves downward.
The laser scanning can be used for scanning the Y-axis position of the ink drop and observing the volume, speed and angle of the fixed liquid drop.
Referring to fig. 4, a second embodiment of the inkjet printing method of the present application includes:
step 201: and providing a second test substrate, and establishing a coordinate system by taking the second test substrate as a reference.
Step 202: and inputting a nozzle coordinate, positioning the nozzle according to the nozzle coordinate, and performing ink-jet printing on the second test substrate to obtain a second test pattern.
Step 203: acquiring second image data of the second test pattern, acquiring coordinates of the second test pattern from the second image data, and calculating a first difference value of the coordinates of the second test pattern and the coordinates of the nozzle on the X axis.
Step 204: and acquiring a second difference value of the coordinate of the second test pattern and the coordinate of the nozzle on the Y axis by using laser scanning.
Step 205: and adjusting the nozzle according to the first difference and the second difference so as to enable the ink drop sprayed by the nozzle to be positioned at a preset coordinate.
Step 206: and providing a reference substrate, and carrying out ink-jet printing on the reference substrate to obtain a reference pattern.
Step 207: first image data of the reference pattern is acquired.
Step 208: and measuring the film thickness of the reference pattern, and calculating the volume of the reference pattern according to the film thickness.
Step 209: and calculating the relation between the first image data of the reference pattern and the volume of the reference pattern according to the first image data of the reference pattern and the volume of the reference pattern, and pre-storing the relation between the first image data of the reference pattern and the volume of the reference pattern.
Step 2010: providing a first test substrate, and carrying out ink-jet printing on the first test substrate according to the preset ink drop quantity to obtain a first test pattern.
Step 2011: and acquiring first image data of the first test pattern, and according to the relationship between the first image data and the volume of the prestored first image data of the reference pattern.
Step 2012: and calculating the volume of a single drop of the ink drops according to the volume of the first test pattern and the preset number of the ink drops, and calculating the number of the target ink drops according to the volume of the single drop of the ink drops and the target printing volume.
Step 2013: and providing a target substrate, and performing ink jet printing on the target substrate according to the target ink drop quantity.
Referring to fig. 5, the present application further provides an inkjet printing apparatus 100. The inkjet printing apparatus 100 includes a printing module M1, an image capture module M2, a calculation module M3, and a storage module M4.
The printing module M1 is configured to perform inkjet printing on the first test substrate with a predetermined number of ink droplets to obtain a first test pattern.
Specifically, the first test substrate is provided with the same roughness as the physical properties, e.g., material, of the target substrate, but with a simpler structure than the target substrate. For example, the target substrate is a driving substrate of an OLED device, and the driving substrate of the OLED device includes a substrate, a driving element, and a pixel defining layer. The substrate may be glass, plastic, or a flexible substrate, etc. The driving element is disposed on the substrate, and the driving element may be a thin film transistor. The pixel definition layer covers the driving element, and a pixel definition opening is formed in the pixel definition layer. Whereas the first test substrate comprises only the substrate and the pixel defining layer. The substrate and the pixel defining layer are the same in material, position, structure and size (area and thickness, etc.) as the target substrate. And printing at a preset position of the first test substrate to obtain a first test pattern. In ink jet printing of an OLED device, the predetermined location is in the pixel defining opening. And printing at least one ink drop to fill the pixel defining opening, spreading the at least one ink drop in the pixel defining opening, and drying to obtain a first test pattern.
The image acquisition module M2 is configured to acquire first image data of the first test pattern according to a relationship between the first image data and a volume of a pre-stored reference pattern.
The image acquisition module M2 may include an image acquisition component. The image capture component may be a Charge Coupled Device (CCD) image sensor. The image acquisition module M2 is specifically configured to: the CCD image sensor shoots at least one drop of ink drop to be spread in the pixel definition opening, the graph of the first test pattern is obtained after drying, and the first image data is obtained by measuring the collected image and then is output to the calculation module. The first image data may contain parameter information of a shape, an area, a diameter, a circumference, etc. of the first test pattern. Optionally, the first image data is parameter information related to an area of the first test pattern.
The relationship of the first image data of the pre-stored reference pattern to the volume may be represented by a functional expression. For example, if the first image data of the reference pattern is the area of the reference pattern represented by S0 and the volume is represented by V0, then V0 ═ f (S0); the first image data of the reference pattern is represented by R0 for the diameter of the reference pattern and V0 for the volume, and V0 is f' (R0). It is understood that the functional formula differs depending on the type of the first image data, and therefore, the functional formula will not be described in detail in the present application. The relationship between the first pattern data and the volume of the first test pattern printed by the same ink jet printing apparatus can be expressed by the functional expression. That is, if the area of the first image data of the first test pattern as the reference pattern is denoted by S1 and the volume is denoted by V1, V1 is f (S1). The first image data of the first test pattern is such that the diameter of the first test pattern is denoted by R1, and the volume is denoted by V1, then V1 ═ f' (R1). The actual volume of the first test pattern can be calculated by substituting the acquired first image data of the first test pattern into a functional expression V1 ═ f (S1) or V1 ═ f' (R1) indicating the relationship between the first image data of the pre-stored reference pattern and the volume.
Optionally, the first image data of the first test pattern is an area of the first test pattern, and the first image data of the reference pattern is an area of the reference pattern. In a more specific embodiment, the first image data of the reference pattern is in a directly proportional relationship with the volume, i.e., V0 ═ k0 × S0. The functional expression of the first image data of the first test pattern as a function of volume is also a direct proportional function, i.e. V1 ═ k0 × S1. Then, the calculation module M3 is specifically configured to: calculating a scaling factor of an area of the first test pattern to an area of the reference pattern, a volume of the first test pattern being equal to a product of the scaling factor and a volume of the reference pattern. The scaling factor of the area of the first test pattern to the area of the reference pattern is the calibration factor of the actual volume to the volume of the reference pattern. Specifically, the area of the first test pattern is denoted by S1, and if the proportionality coefficient k between the area S1 of the first test pattern and the area S0 of the reference pattern is S1/S0, the volume V1 of the first test pattern is V0.
The first image data of the first test pattern and the first image data of the reference pattern are the same kind of parameters. For example, in other embodiments, the first image data of the first test pattern is the diameter or perimeter of the first test pattern, and correspondingly, the first image data of the reference pattern is the diameter or perimeter of the reference pattern.
The calculation module M3 is configured to calculate a volume of a single drop of ink according to the volume of the first test pattern and the preset number of ink drops, and calculate a target number of ink drops according to the volume of the single drop of ink and a target print volume.
The drop volume is equal to the volume of the first test pattern divided by the preset number of drops. The target number of ink drops is equal to the target print volume divided by the ink drop single drop volume.
The printing module M1 is further configured to perform inkjet printing on the target substrate according to the target number of ink droplets.
And printing a preset ink drop quantity in each pixel definition opening to obtain a printing target. During printing, the preset volume of a single drop of the ink drop is the same as the preset volume of a single drop when the first test pattern is printed, so that the actual volume of a single drop of the ink drop ejected by the nozzle is the same as the actual volume when the first test pattern is printed.
Optionally, in order to provide the relationship of the first image data of the reference pattern to the volume, the inkjet printing apparatus further comprises a storage module M4.
The memory module M4 is used to pre-store the relationship between the first image data of the reference pattern and the volume.
The printing module M1 is used for performing inkjet printing on the reference substrate to obtain a reference pattern.
The reference substrate is the same substrate as the first test substrate. The method of ink jet printing on the reference substrate to obtain the reference pattern is also the same as the method of ink jet printing on the first test substrate to obtain the first test pattern. Here, the description thereof is omitted.
The image acquisition module M2 is configured to acquire first image data of the reference pattern.
The collected first image data of the reference pattern is also the same as the first image data on the first test substrate, and the collection method is also the same.
Referring to fig. 6, the inkjet printing apparatus 100 further includes a measuring module M5, wherein the measuring module M5 is configured to measure a film thickness of the reference pattern, and calculate a volume of the reference pattern according to the film thickness.
The volume of the reference pattern can be calculated based on the film thickness of the reference pattern, the shape of the ink drop, the density and density of the ink, and the area of the pixel on the first test substrate. Therefore, by measuring the film thickness of the reference pattern, the volume of the reference pattern can be calculated. The formula of the calculation is different according to different printing conditions, and the method for calculating the volume is not described in detail in the application.
The calculating module M3 is configured to calculate a relationship between the first image data of the reference pattern and the volume of the reference pattern according to the first image data of the reference pattern and the volume of the reference pattern, and pre-store the relationship between the first image data of the reference pattern and the volume of the reference pattern.
Optionally, the first image data of the reference pattern is an area of the reference pattern. From the volume of the reference pattern and the area of the reference pattern, a functional relationship between the volume of the reference pattern and the area of the reference pattern can be fitted. In a specific embodiment, the volume of the reference pattern is in a direct proportional relationship with the area of the reference pattern.
The computing module M3 is further configured to establish a coordinate system based on the second test substrate.
The second test substrate may be the same substrate as the first test substrate, or the second test substrate and the first test substrate may be the same substrate. The calculation module M3 is specifically configured to use the symmetry axis of the second test substrate in the horizontal direction as the X axis, use the symmetry axis of the second test substrate in the vertical direction as the Y axis, or use one side of the second test substrate in the vertical direction as the Y axis. It should be noted that the X-axis and the Y-axis are defined by the user and do not represent the limitation of the directions.
The inkjet printing apparatus 100 also includes an input module M6. The input module M6 is configured to input nozzle coordinates to position the nozzle according to the nozzle coordinates, and the printing module M1 is configured to perform inkjet printing on the second test substrate to obtain a second test pattern.
Alternatively, the nozzle coordinates may be preset coordinates of ink droplets for ink jet printing. The nozzle coordinates may also be adjacent or close to the preset coordinates of the ink droplets of the ink jet printing, taking into account the actual printing situation. And performing ink-jet printing on the second test substrate to obtain a second test pattern in the same way as performing ink-jet printing on the first test substrate to obtain the first test pattern. Here, the description thereof is omitted.
The acquiring module M2 acquires second image data of the second test pattern, acquires coordinates of the second test pattern from the second image data, and the calculating module M3 is configured to calculate a first difference between the coordinates of the second test pattern and the coordinates of the nozzle on the X-axis.
The coordinates of the second test pattern may be the coordinates of the center thereof. And acquiring second image data of the second test pattern, wherein the second image information comprises coordinate information of the second test pattern. Specifically, the coordinates of the second test pattern may be obtained by matching the captured pattern of the second test pattern with the coordinate system established by the calculation module M3. Specifically, assuming that the nozzle coordinates are (a0, b0) and the coordinates of the second test pattern included in the second image data are (a1, b1), the first difference d1 between the coordinates of the second test pattern and the nozzle coordinates on the X axis is a1-a 0.
Taking fig. 3 as an example, the Ink drops that are ordered to be printed by the inkjet head 100 are denoted by Ink1 generation, the Ink drops that are actually printed are denoted by Ink2, and the image capture assembly 200 is used to capture images of the Ink drops. When d1 > 0, it indicates that the ink drop is positioned to the right, and vice versa.
The inkjet printing apparatus 100 also includes a control module M7. The control module M7 is configured to adjust the nozzle according to the first difference value, so that the ink droplet ejected from the nozzle is located at a preset coordinate.
When d1 > 0, indicating that the ink droplet is located to the right, the nozzle is adjusted so that the ink droplet ejected from the nozzle moves to the left. And vice versa.
Since the position of the ink drop is related to the time and volume of the ejected ink drop.
The control module M7 is further configured to adjust the time and volume of ink drops ejected by the nozzles based on the first difference and the second difference.
It is understood that, when the control module M7 adjusts the volume of the ink drop ejected from the nozzle, the calculation module M3 is configured to establish a coordinate system based on the second test substrate and perform the inkjet printing on the first test substrate according to the preset number of ink drops, before the first test pattern is obtained, so as to determine the preset volume of the ink drops, measure the actual volume, and calculate the printing target number of ink drops.
Optionally, the acquiring the second image data of the first test pattern and the acquiring the second image data of the second test pattern are performed by the same image acquisition component.
According to the ink-jet printing method, the image acquisition assembly can be used for acquiring the second image data of the second test pattern to measure the actual dropping position of the ink drop which is pre-jetted, the deviation of the actual dropping position of the ink drop and the preset position on the X axis is calculated, and the nozzle is adjusted according to the deviation, so that the ink drop jetted by the nozzle is dropped on the preset position, and the ink-jet printing accuracy is improved.
Optionally, the inkjet printing apparatus 100 may further include a laser measurement module M8.
The laser measurement module M8 is configured to obtain a second difference between the coordinates of the second test pattern and the coordinates of the nozzle on the Y axis by using laser scanning. Taking fig. 3 as an example, a laser 300 is used to capture the Y-axis coordinates of the ink drops.
Then, the control module M7 is specifically configured to adjust the nozzle according to the first difference and the second difference, so that the ink droplet ejected from the nozzle is located at the preset coordinate. A second difference d2 between the coordinates of the second test pattern and the coordinates of the nozzle on the Y-axis is b1-b 0. When d2 > 0, indicating that the ink droplet is located at an upper position, the nozzle is adjusted so that the ink droplet ejected from the nozzle moves downward.
Not only can the Y-axis position of the drop be scanned with laser scanning, but the volume, velocity, and angle of the fixed drop can also be observed.
The ink-jet printing method utilizes the image acquisition assembly to acquire the first image data of the first test pattern, calculates the volume of the first test pattern according to the relationship between the first image data of the first test pattern and the first image data of the pre-stored reference pattern and the volume, and calculates the volume of a single drop of the ink drop by dividing the volume of the first test pattern by the number of the preset ink drops. Thereby, the single drop volume of the ink droplet at the time of actual printing is calibrated. And dividing the target printing volume by the calibrated single drop volume of the ink drops to obtain the target ink drop number, and performing ink-jet printing on the target substrate according to the target ink drop number, so that the accurate printing volume and film thickness can be obtained, and the ink-jet printing precision is improved.
The foregoing provides a detailed description of embodiments of the present application, and the principles and embodiments of the present application have been described herein using specific examples, which are presented solely to aid in the understanding of the present application. Meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims (10)

1. A method of inkjet printing, comprising:
providing a first test substrate, and carrying out ink-jet printing on the first test substrate according to the preset ink drop quantity to obtain a first test pattern;
acquiring first image data of the first test pattern, and calculating the volume of the first test pattern according to the relationship between the first image data and the volume of a prestored first image data of a reference pattern;
calculating the volume of a single drop of the ink droplets according to the volume of the first test pattern and the preset number of the ink droplets, and calculating the number of the target ink droplets according to the volume of the single drop of the ink droplets and the target printing volume;
and providing a target substrate, and performing ink jet printing on the target substrate according to the target ink drop quantity.
2. The method of inkjet printing according to claim 1 wherein the first image data of the first test pattern is an area of the first test pattern and the first image data of the reference pattern is an area of the reference pattern.
3. The method of inkjet printing according to claim 2 wherein the first image data of the reference pattern is in a direct proportional relationship with respect to volume, wherein acquiring the first image data of the first test pattern and calculating the volume of the first test pattern based on the first image data and a pre-stored relationship with respect to volume of the reference pattern comprises:
calculating a scaling factor of an area of the first test pattern to an area of the reference pattern, a volume of the first test pattern being equal to a product of the scaling factor and a volume of the reference pattern.
4. The inkjet printing method as claimed in claim 1, wherein before acquiring the first image data of the first test pattern and calculating the volume of the first test pattern based on the first image data and the relationship between the first image data of the pre-stored reference pattern and the volume, the method further comprises:
providing a reference substrate, and carrying out ink-jet printing on the reference substrate to obtain a reference pattern;
acquiring first image data of the reference pattern;
measuring the film thickness of the reference pattern, and calculating the volume of the reference pattern according to the film thickness;
and calculating the relation between the first image data of the reference pattern and the volume according to the first image data of the reference pattern and the volume of the reference pattern, and pre-storing the relation between the first image data of the reference pattern and the volume.
5. The inkjet printing method of claim 1, wherein the providing a target substrate, prior to inkjet printing on the target substrate according to the target number of ink droplets, the inkjet printing method further comprises:
providing a second test substrate, and establishing a coordinate system by taking the second test substrate as a reference;
inputting a nozzle coordinate, positioning the nozzle according to the nozzle coordinate, and performing ink-jet printing on the second test substrate to obtain a second test pattern;
acquiring second image data of the second test pattern, acquiring coordinates of the second test pattern from the second image data, and calculating a first difference value of the coordinates of the second test pattern and the coordinates of the nozzle on an X axis;
and adjusting the nozzle according to the first difference value so that the ink drop sprayed by the nozzle is positioned at a preset coordinate.
6. The inkjet printing method of claim 5, further comprising:
acquiring a second difference value of the coordinate of the second test pattern and the coordinate of the nozzle on the Y axis by laser scanning;
adjusting the nozzle according to the first difference value so that the ink drop sprayed by the nozzle is positioned at a preset coordinate specifically comprises:
and adjusting the nozzle according to the first difference and the second difference so as to enable the ink drop sprayed by the nozzle to be positioned at a preset coordinate.
7. The method of inkjet printing according to claim 5 wherein said adjusting the nozzles based on the first difference and the second difference so that the ink drops ejected by the nozzles are at predetermined coordinates comprises:
and adjusting the time and the volume of the ink drop ejected by the nozzle according to the first difference and the second difference.
8. The method of inkjet printing according to claim 5 wherein said capturing first image data of said first test pattern and said capturing second image data of said second test pattern are performed by the same image capture assembly.
9. An inkjet printing apparatus, comprising:
the printing module is used for carrying out ink-jet printing on the first test substrate according to the preset ink drop quantity to obtain a first test pattern;
the image acquisition module is used for acquiring first image data of the first test pattern;
the calculation module is used for calculating the volume of the first test pattern according to the relationship between the first image data and the volume of the prestored first image data of the reference pattern, calculating the volume of a single drop of ink according to the volume of the first test pattern and the preset number of ink drops, and calculating the number of target ink drops according to the volume of the single drop of ink drops and the target printing volume;
and the printing module is also used for carrying out ink-jet printing on the target substrate according to the target ink drop quantity.
10. Inkjet printing apparatus according to claim 9,
the printing module is used for carrying out ink-jet printing on the reference substrate to obtain a reference pattern;
the image acquisition module is used for acquiring first image data of the reference pattern;
the measuring module is used for measuring the film thickness of the reference pattern;
the calculation module is used for calculating the volume of the reference pattern according to the film thickness, calculating the relation between the first image data of the reference pattern and the volume according to the first image data of the reference pattern and the volume of the reference pattern,
the inkjet printing device further comprises a storage module, and the storage module is used for prestoring the relation between the first image data and the volume of the reference pattern.
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Application publication date: 20211210