Inkjet control method, inkjet control device, storage medium, and print head

Abstract

Provided are a method and device for controlling inkjet printing of an OLED display layer, a storage medium, and a printing head. The method comprises: placing a substrate on a base and obtaining positioning data of the substrate; obtaining basic parameters of the substrate; calling a corresponding substrate printing space structure model in a standard library using the basic parameters of the substrate; dividing a printing surface in the substrate printing space structure model into a plurality of identical printing areas, and setting a calibration point on each printing area to form a printing grid; inputting the printing grid to a controller and matching the printing grid with the substrate based on the positioning data of the substrate; setting a multiphase flow model, using the multiphase flow model to set transient pressure for ejecting fluid in an inkjet printing process, and setting an inkjet printing mode in the inkjet printing process; and controlling the size of ink droplets and the uniformity of the distribution of ink dots on the substrate.

Description

Technical Field

[0001] This disclosure relates to the field of display technology, specifically to a printing control method for an OLED display layer, a printing control device for an OLED display layer, a non-transitory computer-readable storage medium, and a printhead for an OLED display layer. Background Technology

[0002] Organic light-emitting diodes (OLEDs) are current-driven organic light-emitting devices that emit light through carrier injection and recombination, with the luminous intensity proportional to the injected current. Under the influence of an electric field, holes generated at the OLED's anode and electrons at its cathode move and are injected into the hole transport layer and electron transport layer, respectively, migrating to the OLED's emissive layer. When holes and electrons meet in the emissive layer, they generate excitons, which excite the molecules in the emissive layer to produce visible light. Currently, the emissive layer of an OLED can be manufactured using inkjet printing. However, in related inkjet printing methods, it is impossible to control the uniformity of the ink droplet size and the uniformity of the ink droplet spread area on the printing medium (e.g., substrate). Summary of the Invention

[0003] Therefore, various embodiments of this disclosure provide a printing control method for an OLED display display layer, a printing control device for an OLED display display layer, a non-transitory computer-readable storage medium, and a printhead for an OLED display display layer.

[0004] The first aspect of this disclosure provides a method for controlling the printing of an OLED display layer, comprising:

[0005] The substrate is placed on the base platform and the positioning data of the substrate is obtained;

[0006] Obtain the basic parameters of the substrate;

[0007] The corresponding substrate printing space structure model in the standard library is called based on the basic parameters of the substrate.

[0008] The printing surface in the substrate printing spatial structure model is divided into multiple identical printing areas, and calibration points are set on each printing area to form a printing grid;

[0009] The printed grid is input to the controller, and the printed grid is matched to the substrate based on the positioning data of the substrate; and

[0010] A multiphase flow model is set up to determine the transient pressure of the ejected fluid during inkjet printing and the inkjet mode during the inkjet printing process.

[0011] The inkjet mode is used to control the switching mode of ink fluid and air fluid during the inkjet printing process, thereby controlling the uniformity of the size of the ink droplets ejected during the inkjet printing process and the uniformity of the distribution of ink dots formed by the ink droplets falling on the substrate.

[0012] In some embodiments, controlling the ink fluid includes:

[0013] Obtain the area of ​​the printed grid;

[0014] The total amount of ink required for the printing grid is calculated by the ink volume calculation module in the multiphase flow model based on the area of ​​the printing grid.

[0015] The amount of ink fluid ejected during each inkjet process is calculated based on the total ink volume.

[0016] The ink volume ejected during the inkjet process, based on the same printing grid setting, forms continuous control commands; and

[0017] The transient pressure of each ink ejection from the printhead is controlled based on the continuous control commands.

[0018] In some embodiments, the continuous control command is set based on a set rule, which includes:

[0019] The nozzle motion rules are used to write the coordinate data and calibration points marked in the printing grid into the setting code, and to configure the setting stroke of the nozzle through the setting code to form a first set of control instructions;

[0020] The inkjet volume setting rule is used to set the ink intake volume of the printhead to 1.5 to 2 times the inkjet volume by setting the ink intake volume of the printhead for each time, and to set the ink intake and inkjet of the printhead based on the inkjet volume to form a second set of control commands.

[0021] The rules for setting the transient pressure of the inkjet volume are used to set the transient pressure of each inkjet from the printhead based on the inkjet volume for each stroke, thereby forming a third set of control commands; and

[0022] The merging rule is used to match the second control instruction set with the first control instruction set, and to match the third control instruction set with the second control instruction set to form a merged instruction set, wherein each merging instruction in the merged instruction set includes a first control instruction, a second control instruction, and a third control instruction arranged sequentially.

[0023] In some embodiments, inputting the printed grid to the controller and matching the printed grid to the substrate based on the positioning data of the substrate includes:

[0024] The first coordinate set of the printed grid is input to the controller, and the first coordinate set is input to the positioning controller of the base, where coordinate transformation is performed to form a second coordinate set for printing control of the substrate; and

[0025] Based on the positioning data of the substrate on the base, calibration is performed in the second coordinate set to achieve the matching of the printed grid with the substrate.

[0026] In some embodiments, the transient pressure of the fluid during the inkjet printing process is set using the multiphase flow model to control the surface adhesion of the ink fluid and the air fluid under a dynamically changing surface tension coefficient.

[0027] In some embodiments, the dynamically changing surface tension coefficient is set based on the inkjet pattern during the inkjet printing process.

[0028] In some embodiments, setting the dynamically changing surface tension coefficient based on the inkjet pattern during the inkjet printing process includes:

[0029] Acquire the switching mode of the ink fluid and the air fluid during the inkjet printing process; and

[0030] The transient pressure of the ink fluid is set to a first surface tension coefficient based on the switching mode, and the transient pressure of the air fluid is set to a second surface tension coefficient, wherein the second surface tension coefficient is different from the first surface tension coefficient.

[0031] In some embodiments, the first surface tension coefficient is the surface tension coefficient of the ink fluid, and the second surface tension coefficient is the surface tension coefficient of the air fluid.

[0032] In some embodiments, the calculation of the total ink volume required for the printing grid based on the area of ​​the printing grid by the ink volume calculation module in the multiphase flow model includes:

[0033] The total ink volume is the product of the total area of ​​the printed network and the grid depth defined by the substrate printing spatial structure model.

[0034] In some embodiments, calculating the amount of ink fluid ejected during each inkjet process based on the total ink volume includes:

[0035] The printing surface in the substrate printing spatial structure model is divided into multiple identical quadrilateral grids. Each quadrilateral grid is used as a printing area. The coordinates of each quadrilateral grid are determined, and the center point of each quadrilateral grid is used as the calibration point to form the first coordinate set of the printing grid; and

[0036] The quotient obtained by dividing the total ink volume by the number of quadrilateral grids is the amount of ink fluid ejected in each inkjet process.

[0037] In some embodiments, the positioning data is the coordinates of the substrate on the base.

[0038] In some embodiments, the basic parameters include the length, width, height, material, and properties of the substrate.

[0039] In some embodiments, the transient pressure of the ejected fluid includes the transient pressure of the ejected pattern fluid and the transient pressure of the ejected air fluid.

[0040] In some embodiments, the switching mode of the ink fluid and the air fluid during the inkjet printing process includes alternately ejecting the ink fluid and the air fluid.

[0041] A second aspect of this disclosure provides a printing control apparatus for an OLED display layer, comprising a processor and a memory, wherein the memory stores computer-executable instructions, which, when executed by the processor, cause the processor to implement the printing control method for an OLED display layer according to any embodiment of the first aspect of this disclosure.

[0042] A third aspect of this disclosure provides a non-transitory computer-readable storage medium having computer-executable instructions stored thereon, which, when executed by a processor, cause the processor to implement the inkjet printing control method for an OLED display display layer according to any embodiment of the first aspect of this disclosure.

[0043] A fourth aspect of this disclosure provides a printing nozzle for an OLED display display layer, comprising:

[0044] First fixing plate;

[0045] A plurality of nozzles located on a first surface of the first fixed plate, wherein the plurality of nozzles are used to eject ink;

[0046] A second fixing plate located on a second surface of the first fixing plate, wherein the second surface and the first surface are opposite to each other; and

[0047] Multiple air ducts located on the side of the second fixed plate away from the first fixed plate, wherein the multiple air ducts are used to spray air and correspond one-to-one with the multiple nozzles;

[0048] The plurality of nozzles are used to eject ink droplets of uniform size with a first surface tension.

[0049] In some embodiments, the plurality of air ducts are used to spray airflow onto ink droplets ejected from the plurality of nozzles at a second surface tension, wherein the second surface tension is different from the first surface tension.

[0050] In some embodiments, the first surface tension is the surface tension of the ink.

[0051] In some embodiments, the second surface tension is the surface tension of the air.

[0052] In some embodiments, the plurality of nozzles and the plurality of air ducts are configured to operate alternately. Attached Figure Description

[0053] Figure 1 This is a flowchart of a printing control method for an OLED display display layer according to an embodiment of the present disclosure;

[0054] Figure 2 This is a schematic diagram of a base according to an embodiment of the present disclosure;

[0055] Figure 3 This is a schematic diagram of a print surface according to an embodiment of the present disclosure, which for example includes 42 print areas in 6 rows and 7 columns (also 42 print grids in this example);

[0056] Figure 4 This is a flowchart of another inkjet printing control method for an OLED display display layer according to an embodiment of the present disclosure;

[0057] Figure 5 This is a schematic diagram of a printing control device for an OLED display display layer according to an embodiment of the present disclosure;

[0058] Figure 6 This is a schematic diagram of another inkjet printing control device for an OLED display display layer according to an embodiment of the present disclosure;

[0059] Figure 7 This is a schematic diagram of the structure of a printing nozzle for an OLED display display layer according to an embodiment of the present disclosure; and

[0060] Figure 8 yes Figure 7 The printhead shown is along Figure 7 A side view viewed from the left or right side. Detailed Implementation

[0061] To enable those skilled in the art to better understand the technical solutions of this disclosure, the pixel circuit array, display panel, method for driving pixel circuit array, and method for driving display panel provided in this disclosure will be further described in detail below with reference to the accompanying drawings and exemplary embodiments.

[0062] It should be understood that although the terms “first,” “second,” “third,” etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, without departing from the scope of this disclosure, a first element may be referred to as a second element or a third element, etc., and similarly, a second element may be referred to as a first element or a third element, etc.

[0063] Figure 1 This is a flowchart of a printing control method for an OLED display display layer according to an embodiment of the present disclosure. Figure 1 As shown, the printing control method may include steps S11 to S16 as described below.

[0064] Step S11 includes placing the substrate on the base platform and acquiring the positioning data of the substrate.

[0065] For example, Figure 2 This is a schematic diagram of a base according to an embodiment of the present disclosure. Figure 2 As shown, the base can have a two-dimensional rectangular coordinate system A-XY (or a three-dimensional rectangular coordinate system A-XYZ; for example, the Z-axis can be connected via...). Figure 2 Point A is shown in the diagram and has a vertically upward positive direction. The substrate (i.e., the printing medium) can have a rectangular shape. When placing the substrate on the base, one vertex of the substrate can be aligned with the origin A of the two-dimensional rectangular coordinate system A-XY, and two adjacent sides of the substrate can be aligned with the X-axis and Y-axis, respectively. In this way, the positioning data of the substrate (i.e., the coordinates of the substrate on the base) can be easily obtained.

[0066] Step S12 includes obtaining the basic parameters of the substrate.

[0067] For example, the basic parameters of the substrate may include the substrate's length, width, height, material, material properties, etc., and these parameters may be measured in advance or obtained from the substrate's manufacturer.

[0068] Step S13 includes calling the corresponding substrate printing space structure model from the standard library using the basic parameters of the substrate.

[0069] For example, this standard library is a database of experimental parameters derived by printer manufacturers based on research into the fundamental parameters of various existing substrates. These experimental parameters can also be obtained from material suppliers of various substrates, or obtained by printer users through their own experiments. For instance, this standard library can include the dimensional parameters (i.e., length, width, height, etc.), materials, and material properties of various substrates, as well as the adaptability parameters of each material to the processing. Furthermore, the substrate printing space structure model is an inkjet-printed substrate model, widely used in the OLED technology field. This substrate printing space structure model defines the coordinates, printing surfaces, and printing grid of the substrate printing space and can be controlled by the printer's controller.

[0070] Step S14 includes dividing the printing surface in the substrate printing space structure model into multiple identical printing areas, and setting calibration points on each printing area to form a printing grid.

[0071] For example, the printing surface is predefined by the printer manufacturer in the substrate printing space structure model according to their product type. Furthermore, the printing surface can be divided into multiple identical printing areas (in... Figure 3 The example has 42 print areas), and calibration points are set on each print area (in...). Figure 3 In the example, 42 is used to set calibration points B(0.5,0.5), C(2.5,0.5), etc. at the center of each printed area to form a printed grid (in Figure 3 In the example, each printed area is a printed grid. In one embodiment, a printed grid may correspond to the position of an OLED on the substrate. It should be understood that... Figure 3 The division of the printing area and the printing grid shown are merely examples, and this disclosure is not limited thereto.

[0072] Step S15 includes inputting the printed grid to the controller and matching the printed grid to the substrate based on the positioning data of the substrate.

[0073] For example, the controller is the printer's control program. Furthermore, matching the printing grid with the substrate can be achieved by matching the substrate's positioning data with an existing control model in the printer's control program, thereby printing the desired product type.

[0074] Step S16 includes: setting a multiphase flow model, using the multiphase flow model to set the transient pressure of the ejected fluid during inkjet printing, and setting the inkjet mode during inkjet printing; wherein, the inkjet mode is used to control the switching mode of ink fluid and air fluid during inkjet printing, thereby controlling the uniformity of the size of the ejected ink droplets and the uniformity of the distribution of ink dots formed by the ink droplets falling onto the substrate during inkjet printing.

[0075] The multiphase flow model is a relatively mature control mode in this and related technical fields. In this technical field, it is mainly used to control the inkjet mode (e.g., the switching mode between ink fluid and air fluid) and the transient pressure when the printhead ejects ink.

[0076] In some embodiments, such as Figure 4 As shown in S2, controlling the ink fluid includes: obtaining the area of ​​the printing grid; calculating the total ink volume required for the printing grid by the ink volume calculation module in the multiphase flow model based on the area of ​​the printing grid; calculating the ink volume of the ink fluid in each inkjet process based on the total ink volume; forming a continuous control command based on the ink volume of the ink fluid in the inkjet process set for the same printing grid; and controlling the transient pressure of the printhead for each inkjet based on the continuous control command.

[0077] For example, the continuous control command refers to a control command that uniformly encodes and sorts all printed grids on the entire substrate, and prints them sequentially according to the encoding order, which will be further described below. Furthermore, the inkjet volume is related to the inkjet pressure; the higher the pressure, the greater the inkjet volume. The inkjet volume for each printed grid can be calculated in advance based on its area, and then the inkjet pressure for that grid can be deduced from the inkjet volume.

[0078] In some embodiments, such as Figure 4 As shown, the continuous control command is set based on a set rule, which includes:

[0079] Nozzle movement rules (e.g.) Figure 4 As shown in S31, it is used to write the coordinate data and calibration points calibrated in the printing grid into the setting code, and to configure the setting stroke of the nozzle through the setting code to form a first set of control instructions;

[0080] Inkjet volume setting rules (such as...) Figure 4As shown in S32, it is used to set the ink intake of the printhead to 1.5 to 2 times the ink ejection amount by setting the ink intake amount of the printhead each time, and to set the ink intake and ink ejection of the printhead based on the ink ejection amount to form a second set of control commands.

[0081] The rules for setting the transient pressure of inkjet volume (e.g.) Figure 4 As shown in S33), it is used to set the transient pressure of each ink ejection from the printhead based on the ink ejection volume for each ejection, so as to form a third set of control commands; and

[0082] Merge rules (such as) Figure 4 As shown in S34, it is used to match the second control instruction set with the first control instruction set, and to match the third control instruction set with the second control instruction set to form a merge instruction set, wherein each merge instruction in the merge instruction set includes a first control instruction, a second control instruction and a third control instruction arranged sequentially.

[0083] For example, the first set of control instructions can be {I 11, I 12, I 13, ...}, the second set of control instructions can be {I 21, I 22, I 23, ...}, and the third set of control instructions can be {I 31, I 32, I 33, ...}. In this case, the merge instruction set can be {I 11, I 21, I 31, I 12, I 22, I 32, I 13, I 23, I 33, ...}, the first merge instruction of the merge instruction set can be {I 11, I 21, I 31}, the second merge instruction of the merge instruction set can be {I 12, I 22, I 32}, the third merge instruction of the merge instruction set can be {I 13, I 23, I 33}, and so on.

[0084] In some embodiments, inputting the printed grid to the controller and matching the printed grid to the substrate based on the positioning data of the substrate includes:

[0085] The first coordinate set of the printed grid is input to the controller, and the first coordinate set is input to the positioning controller of the base, where coordinate transformation is performed to form a second coordinate set for printing control of the substrate; and

[0086] Based on the positioning data of the substrate on the base, calibration is performed in the second coordinate set to achieve the matching of the printed grid with the substrate (for example, as described above, each printed grid can correspond to the position of an OLED on the substrate).

[0087] For example, the controller may be a printing program for a printer, and the content input to the controller may include: the printing grid contained in the spatial structure model selected based on the substrate type, and the positioning data of the substrate on the base (i.e., the coordinates of the substrate on the base).

[0088] In some embodiments, the transient pressure of the fluid during the inkjet printing process is set using the multiphase flow model to control the surface adhesion of the ink fluid and the air fluid under a dynamically changing surface tension coefficient.

[0089] In some embodiments, the dynamically changing surface tension coefficient is set based on the inkjet pattern during the inkjet printing process.

[0090] In some embodiments, setting the dynamically changing surface tension coefficient based on the inkjet pattern during the inkjet printing process includes:

[0091] Acquire the switching mode of the ink fluid and the air fluid during the inkjet printing process; and

[0092] The transient pressure of the ink fluid is set to a first surface tension coefficient based on the switching mode, and the transient pressure of the air fluid is set to a second surface tension coefficient, wherein the second surface tension coefficient is different from the first surface tension coefficient.

[0093] In some embodiments, the first surface tension coefficient is the surface tension coefficient of the ink fluid, and the second surface tension coefficient is the surface tension coefficient of the air fluid.

[0094] For example, the controller can be the printing control program for the entire printer, and can acquire the positioning data (i.e., coordinates), print the printing grid, etc. The controller can also be used for:

[0095] Obtain the inkjet printing settings;

[0096] The number of inkjet prints per print is configured based on the set travel time.

[0097] Set the inkjet interval for each inkjet, and set a dry print within at least one inkjet interval;

[0098] A set of continuous control commands is set up to control the amount of ink ejected in each inkjet process, thereby effectively controlling the uniformity of the size of the ink droplets ejected during inkjet printing and the uniformity of the distribution of ink dots formed when the droplets land on the substrate; and

[0099] The instantaneous pressure of the air fluid used for ejection is controlled by continuous control commands during each air jet process, so as to spray the air flow onto the top of the ink droplets under a set pressure range, thereby controlling the uniformity of the secondary distribution of the ink droplets.

[0100] For example, the set stroke is the movement stroke of the nozzle.

[0101] In the embodiments of this disclosure, during the inkjet printing process, the uniformity of droplet size and droplet distribution in each predetermined stroke is controlled by controlling the switching mode of the ink fluid and air fluid during the inkjet printing process. That is, by controlling the amount of ink fluid ejected in each inkjet process, the droplet size becomes uniform. Furthermore, the instantaneous pressure of the air fluid during each airjet process is controlled to spray the airflow onto the upper part of the ink droplets under a predetermined pressure range, contributing to the uniformity of the secondary distribution of the ink droplets, thereby making the ink droplet distribution more uniform.

[0102] In the embodiments of this disclosure, when air fluid is sprayed onto the ink droplets at a pressure within a set range, it uniformly disperses multiple ink droplets falling on the substrate. For example, large ink droplets are dispersed into multiple small ink droplets under the action of the airflow. To achieve this, the transient pressure when the ink fluid is ejected is set to a first surface tension coefficient, and the transient pressure when the air fluid is ejected is set to a second surface tension coefficient different from the first surface tension coefficient. That is, different surface tension coefficients are used to complete the ink ejection and subsequent dispersion, so that the ink droplets have a more uniform dispersed phase. In other words, the pressure used for ink ejection and the pressure used for ejecting air fluid are different because ink droplets and gas have different surface tension coefficients. The surface tension coefficient affects the spreadability of the material; therefore, the influence of the surface tension coefficient of the ink droplets needs to be considered when ink is ejected, and the influence of the surface tension coefficient of the air needs to be considered when ejecting air.

[0103] In the embodiments of this disclosure, during the inkjet printing process, the uniformity of the size of the ink droplets ejected during each set stroke and the uniformity of the ink droplet distribution formed on the substrate are controlled by controlling the switching mode of the ink fluid and air fluid during the inkjet printing process. That is, by controlling the amount of ink fluid ejected in each inkjet process, the size of the ink droplets ejected during inkjet printing is made uniform. Furthermore, the instantaneous pressure of the air fluid during each airjet process is controlled to spray the airflow at a pressure within a set range onto the upper part of the ink droplets for secondary distribution of the ink droplets, thereby making the distribution of ink droplets more uniform.

[0104] As described above, when air is sprayed onto the ink droplets at a pressure within a set range, it uniformly disperses the multiple ink droplets falling on the substrate. For example, large ink droplets are dispersed into multiple smaller ink droplets under the action of the airflow. To achieve this, the transient pressure when the ink fluid is ejected is controlled to a first surface tension coefficient (e.g., the surface tension coefficient of the ink used), and the transient pressure when the air fluid is ejected is controlled to a second surface tension coefficient (e.g., the surface tension coefficient of the air). In other words, ink ejection and the dispersion of ink droplets after ink ejection are achieved by using different surface tension coefficients, resulting in a more uniform dispersed phase in the ink droplets.

[0105] Therefore, an air nozzle is installed at the printhead of an inkjet printer. During the inkjet printing process, the printhead and the air nozzle operate alternately. The following will refer to... Figure 5 , Figure 7 and Figure 8 Further explanation.

[0106] For example, during the inkjet printing process, a substrate undergoes several printhead movements. These printhead movements are divided into regular segments, with each stroke completing the inkjet printing of one or more quadrilateral grids. Therefore, the set stroke refers to the printhead's movement stroke.

[0107] As described above, the controller can also be used to: acquire the set stroke of inkjet printing; and configure the number of inkjet prints per inkjet print based on the set stroke.

[0108] Set the inkjet interval for each inkjet, and set a dry print within at least one inkjet interval;

[0109] A set of continuous control commands is set up to control the amount of ink ejected in each inkjet process, thereby effectively controlling the size of ink droplets and the uniformity of ink droplet distribution during inkjet printing; and

[0110] The instantaneous pressure of the air fluid during each air jet is controlled by continuous control commands, so that the air flow is sprayed onto the upper part of the ink droplets under a set pressure range, so that the ink droplets are distributed more evenly.

[0111] In embodiments of this disclosure, the printing surface in the substrate printing spatial structure model is divided into multiple identical quadrilateral grids, each quadrilateral grid serving as a printing area; the coordinates of each quadrilateral grid are determined, and the center point of each quadrilateral grid is used as a calibration point, thereby forming a first coordinate set of the printing grid. Figure 3 As shown, an exemplary printing surface is illustrated, with the origin A of the printing surface set to coordinates (0, 0) (i.e., the origin of the printing surface is located at...). Figure 2The origin A of the two-dimensional rectangular coordinate system A-XY is shown. In this case, the coordinates of the centers of the quadrilateral grids corresponding to points B and C are (0.5, 0.5) and (2.5, 0.5), respectively. Similarly, the coordinates of the centers (i.e., calibration points) of the other quadrilateral grids can also be obtained.

[0112] As described above, the controller receives a first coordinate set of the printing grid, inputs the first coordinate set to the base positioning controller, and performs coordinate transformation in the base positioning controller to form a second coordinate set for printing control of the substrate; and calibrates based on the positioning data of the substrate on the base in the second coordinate set, thereby achieving matching between the printing grid and the substrate.

[0113] In some embodiments, the calculation of the total ink volume required for the printing grid based on the area of ​​the printing grid by the ink volume calculation module in the multiphase flow model includes:

[0114] The total ink volume is the product of the total area of ​​the printed network and the grid depth defined by the substrate printing spatial structure model.

[0115] In some embodiments, calculating the amount of ink fluid ejected during each inkjet process based on the total ink volume includes:

[0116] The printing surface in the substrate printing spatial structure model is divided into multiple identical quadrilateral grids. Each quadrilateral grid is used as a printing area. The coordinates of each quadrilateral grid are determined, and the center point of each quadrilateral grid is used as the calibration point to form the first coordinate set of the printing grid; and

[0117] The quotient obtained by dividing the total ink volume by the number of quadrilateral grids is the amount of ink fluid ejected in each inkjet process.

[0118] In some embodiments, the positioning data is the coordinates of the substrate on the base.

[0119] In some embodiments, the basic parameters include the length, width, height, material, and properties of the substrate.

[0120] In some embodiments, the transient pressure of the ejected fluid includes the transient pressure of the ejected pattern fluid and the transient pressure of the ejected air fluid.

[0121] In some embodiments, the switching mode of the ink fluid and the air fluid during the inkjet printing process includes alternately ejecting the ink fluid and the air fluid.

[0122] Figure 5This is a flowchart of a printing control apparatus for an OLED display display layer according to an embodiment of the present disclosure. Figure 5 As shown, the printing control device may include a processor 51 (e.g., a general-purpose processor, microprocessor, dedicated processor, etc.) and a memory 52 (e.g., a read-only memory ROM and / or random access memory RAM), which can be connected via a data bus 55. The printing control device can control the printer 53 to execute any of the printing control methods described in the foregoing embodiments of this disclosure. The printer 53 can be connected to the processor 51 and / or the memory 52 via wired or wireless means. The printer 53 may include a printhead 54, the structure of which is as follows: Figure 7 and Figure 8 As shown below, this will be described in further detail.

[0123] like Figure 5 As shown, some embodiments of this disclosure provide a printing control device for an OLED display display layer. The printing control device includes a processor 51 and a memory 52. ​​The memory 52 stores computer-executable instructions. When the computer-executable instructions are executed by the processor 51, the processor 51 implements the printing control method for an OLED display display layer according to any of the foregoing embodiments of this disclosure.

[0124] Reference Figure 6 As another embodiment, this disclosure also provides another printing control device for the display layer of an OLED display, including:

[0125] A positioning controller is used to place the substrate on the base and obtain positioning data of the substrate on the base;

[0126] An input device is used to input data such as the basic parameters of the substrate, and to call the corresponding substrate printing spatial structure model in the standard library based on the basic parameters of the substrate; the input device can be a known input device such as a mouse or keyboard.

[0127] A divider is used to divide the printing surface in the substrate printing spatial structure model into multiple identical printing areas, and to set a calibration point on each printing area to form a printing grid;

[0128] A multiphase flow model is used to set the transient pressure of the ejected fluid during inkjet printing, and to set the inkjet printing mode; wherein, the inkjet printing mode is based on a set controller (e.g., Figure 6 (As shown) This controls the switching mode of ink fluid and air fluid during the inkjet printing process, thereby controlling the uniformity of the size of the ink droplets ejected during each set stroke of the inkjet printing process and the uniformity of the distribution of ink dots formed by the ink droplets falling on the substrate.

[0129] exist Figure 6 In this context, the controller is used for:

[0130] Obtain the inkjet printing set stroke; configure the number of inkjet prints per print based on the set stroke;

[0131] Set the inkjet interval for each inkjet, and set a dry print within at least one inkjet interval;

[0132] A set of continuous control commands is set up to control the amount of ink ejected in each inkjet process, thereby ensuring that the size of the ink droplets ejected during inkjet printing is uniform; and

[0133] The instantaneous pressure of the air fluid during each air jet is controlled by continuous control commands, so that the air flow is sprayed onto the upper part of the ink droplets under a set pressure range for secondary distribution of the ink droplets, thereby making the distribution of ink droplets more uniform.

[0134] For example, the locator, the divider, and the controller can be implemented by a combination of a processor and computer-executable instructions, that is, when the computer-executable instructions are executed by the processor, the processor is used as the locator, the divider, and the controller.

[0135] Some embodiments of this disclosure provide a non-transitory computer-readable storage medium (e.g., DVD, flash memory, hard disk drive, solid-state drive, etc.) storing computer-executable instructions thereon, which, when executed by a processor, cause the processor to implement the inkjet printing control method for an OLED display display layer according to any of the foregoing embodiments of this disclosure.

[0136] Figure 7 This is a schematic diagram of the structure of a printing nozzle 54 for an OLED display display layer according to an embodiment of the present disclosure, and Figure 8 yes Figure 7 The print head 54 shown is along Figure 7 A side view viewed from the left or right side. For example... Figure 7 and Figure 8As shown, the printhead 54 includes: a first fixing plate 4; a plurality of nozzles 2 located on a first surface (e.g., the upper surface) of the first fixing plate 4, wherein the plurality of nozzles 2 are used to eject ink; a second fixing plate (i.e., an air duct fixing plate) 3 located on a second surface (e.g., the lower surface) of the first fixing plate 4, wherein the second surface and the first surface are opposite to each other; and a plurality of air ducts 1 located on the side of the second fixing plate 3 away from the first fixing plate 4, wherein the plurality of air ducts 1 are used to eject air and correspond one-to-one with the plurality of nozzles 2. The plurality of nozzles 2 are used to eject ink droplets of uniform size with a first surface tension.

[0137] In some embodiments, the plurality of air ducts 1 are used to spray airflow onto ink droplets ejected from the plurality of nozzles 2 with a second surface tension, wherein the second surface tension is different from the first surface tension.

[0138] In some embodiments, the first surface tension is the surface tension of the ink.

[0139] In some embodiments, the second surface tension is the surface tension of the air.

[0140] In some embodiments, the plurality of nozzles 2 and the plurality of air ducts 1 are configured to operate alternately. For example, one nozzle 2 first ejects ink droplets, and then the air duct 1 corresponding to that nozzle 2 ejects air; then, another nozzle 2 ejects ink droplets, and then the air duct 1 corresponding to that other nozzle 2 ejects air; and so on.

[0141] like Figure 7 and Figure 8 As shown, in the embodiments of this disclosure, the printhead includes: a first fixing plate 4, a plurality of nozzles 2 disposed on the first fixing plate 4, and an air duct fixing plate 3 disposed on the rear side of the first fixing plate 4, wherein a plurality of air ducts 1 corresponding to the nozzles are disposed on the air duct fixing plate 3. Thus, during printing, each print will print a row of printing grids on the printing surface (see [reference]). Figure 3 Therefore, the printing grid can be set according to the size of the ink droplets so that a single inkjet can fill the entire printing grid. For inks of different materials, the size of the printing grid can be set according to actual needs. During printing, the printing nozzle is controlled to spray ink, then air sprays, then advances to the next position. At this point, the printing nozzle is controlled to spray ink again, and the air duct is controlled to spray air fluid into the printing grid.

[0142] Alternatively, the air outlet of each duct 1 can be directly extended into the corresponding nozzle 2. This allows for simultaneous airflow into the nozzles during inkjet printing, ensuring the fluid has the desired transient pressure during the process, such as an ink pressure of 1 kPa and an airflow pressure of 1.5 kPa. A multiphase flow model is used to set the transient pressure of the fluid during inkjet printing, controlling the surface adhesion between the ink and air fluids under a dynamically changing surface tension coefficient. When the air fluid is sprayed onto the ink droplets at a set pressure, it uniformly disperses the multiple ink droplets falling onto the substrate; for example, large ink droplets are dispersed into smaller droplets under the influence of the airflow. To achieve this, the transient pressure when the ink fluid is ejected is controlled to a first surface tension coefficient, and the transient pressure when the air fluid is ejected is controlled to a second surface tension coefficient. In other words, by using different surface tension coefficients for inkjet printing and subsequent dispersion, the ink droplets achieve a uniform dispersed phase. In this application, the dynamically changing surface tension coefficient is set based on the inkjet printing mode during the inkjet printing process. Specifically, it involves: acquiring the switching mode of the ink fluid and air fluid during the inkjet printing process; setting the transient pressure when ejecting the ink fluid as the first surface tension coefficient based on the switching mode, and setting the transient pressure when ejecting the air fluid as the second surface tension coefficient. This results in uniform ink droplet size during the inkjet printing process and a more uniform distribution of ink dots formed when the ink droplets fall onto the substrate.

[0143] For example, each of the duct 1, nozzle 2, second fixing plate (i.e., duct fixing plate) 3 and first fixing plate 4 can be made of a material known to be suitable for printer nozzles, such as plastic, metal, etc.

[0144] It should be understood that, in the absence of obvious conflict, the foregoing embodiments of this disclosure may be combined with each other.

[0145] It should be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of this disclosure, and this disclosure is not limited thereto. Various modifications and improvements can be made by those skilled in the art without departing from the scope of protection of this disclosure as defined by the appended claims, and these modifications and improvements also fall within the scope of protection of this disclosure.

Claims

1. A method for controlling the printing of an OLED display layer, comprising: The substrate is placed on the base platform and the positioning data of the substrate is obtained; Obtain the basic parameters of the substrate; The corresponding substrate printing space structure model in the standard library is called based on the basic parameters of the substrate. The printing surface in the substrate printing spatial structure model is divided into multiple identical printing areas, and calibration points are set on each printing area to form a printing grid; The printed grid is input to the controller, and the printed grid is matched with the substrate based on the positioning data of the substrate; as well as A multiphase flow model is set up to determine the transient pressure of the ejected fluid during inkjet printing and the inkjet mode during the inkjet printing process. The inkjet mode is used to control the switching mode of ink fluid and air fluid during the inkjet printing process, thereby controlling the uniformity of the size of the ink droplets ejected during the inkjet printing process and the uniformity of the distribution of ink dots formed by the ink droplets falling on the substrate. The control of the ink fluid includes: Obtain the area of ​​the printed grid; The total amount of ink required for the printing grid is calculated by the ink volume calculation module in the multiphase flow model based on the area of ​​the printing grid. The amount of ink fluid ejected during each inkjet process is calculated based on the total ink volume. The ink volume ejected during the inkjet process, based on the same printing grid setting, forms continuous control commands; and The transient pressure of each ink ejection from the printhead is controlled based on the continuous control commands. The continuous control command is set based on a set rule, which includes: The nozzle motion rules are used to write the coordinate data and calibration points marked in the printing grid into the setting code, and to configure the setting stroke of the nozzle through the setting code to form a first set of control instructions; The inkjet volume setting rule is used to set the ink intake volume of the printhead to 1.5 to 2 times the inkjet volume by setting the ink intake volume of the printhead for each time, and to set the ink intake and inkjet of the printhead based on the inkjet volume to form a second set of control commands. The rules for setting the transient pressure of the inkjet volume are used to set the transient pressure of each inkjet from the printhead based on the inkjet volume for each stroke, thereby forming a third set of control commands; and The merging rule is used to match the second control instruction set with the first control instruction set, and to match the third control instruction set with the second control instruction set to form a merged instruction set, wherein each merging instruction in the merged instruction set includes a first control instruction, a second control instruction, and a third control instruction arranged sequentially.

2. The printing control method according to claim 1, wherein, The step of inputting the printed grid to the controller and matching the printed grid to the substrate based on the positioning data of the substrate includes: The first coordinate set of the printed grid is input to the controller, and the first coordinate set is input to the positioning controller of the base, where coordinate transformation is performed to form a second coordinate set for printing control of the substrate; and The positioning data of the substrate on the base plate is used to calibrate in the second coordinate set, thereby achieving the matching of the printed grid with the substrate.

3. The printing control method according to any one of claims 1 to 2, wherein, The transient pressure of the fluid during inkjet printing is set using the multiphase flow model to control the surface adhesion between the ink fluid and the air fluid under a dynamically changing surface tension coefficient.

4. The printing control method according to claim 3, wherein, The dynamically changing surface tension coefficient is set based on the inkjet pattern during the inkjet printing process.

5. The printing control method according to claim 4, wherein, Setting the dynamically changing surface tension coefficient based on the inkjet pattern during the inkjet printing process includes: Acquire the switching mode of the ink fluid and the air fluid during the inkjet printing process; and Based on the switching mode, the transient pressure of the ink fluid is set to a first surface tension coefficient, and the transient pressure of the air fluid is set to a second surface tension coefficient, wherein the second surface tension coefficient is different from the first surface tension coefficient.

6. The printing control method according to claim 5, wherein, The first surface tension coefficient is the surface tension coefficient of the ink fluid, and the second surface tension coefficient is the surface tension coefficient of the air fluid.

7. The printing control method according to claim 1, wherein, The calculation of the total ink volume required for the printing grid, based on the area of ​​the printed grid, by the ink volume calculation module in the multiphase flow model, includes: The total ink volume is the product of the total area of ​​the printed network and the grid depth defined by the substrate printing spatial structure model.

8. The printing control method according to claim 2, wherein, The calculation of the ink volume ejected during each inkjet process based on the total ink volume includes: The printing surface in the substrate printing spatial structure model is divided into multiple identical quadrilateral grids. Each quadrilateral grid is used as a printing area. The coordinates of each quadrilateral grid are determined, and the center point of each quadrilateral grid is used as the calibration point to form the first coordinate set of the printing grid; and The quotient obtained by dividing the total ink volume by the number of quadrilateral grids is the amount of ink fluid ejected in each inkjet process.

9. The inkjet printing control method according to any one of claims 1 to 2, wherein, The positioning data is the coordinates of the substrate on the base plate.

10. The printing control method according to any one of claims 1 to 2, wherein, The basic parameters include the length, width, height, material, and properties of the substrate.

11. The printing control method according to any one of claims 1 to 2, wherein, The transient pressure of the ejected fluid includes the transient pressure of the ejected ink fluid and the transient pressure of the ejected air fluid.

12. The printing control method according to any one of claims 1 to 2, wherein, The switching mode of the ink fluid and the air fluid in the inkjet printing process includes alternately ejecting the ink fluid and the air fluid.

13. A printing control device for an OLED display layer, comprising a processor and a memory, wherein the memory stores computer-executable instructions, which, when executed by the processor, cause the processor to implement the printing control method for an OLED display layer according to any one of claims 1 to 12.

14. A non-transitory computer-readable storage medium having stored thereon computer-executable instructions, which, when executed by a processor, cause the processor to implement the inkjet printing control method for an OLED display display layer according to any one of claims 1 to 12.

15. A printhead for an OLED display display layer, the printhead being controlled by the printing control method according to claim 1, the printhead comprising: First fixing plate; A plurality of nozzles located on a first surface of the first fixed plate, wherein the plurality of nozzles are used to eject ink; A second fixing plate located on a second surface of the first fixing plate, wherein the second surface and the first surface are opposite to each other; as well as Multiple air ducts located on the side of the second fixed plate away from the first fixed plate, wherein the multiple air ducts are used to spray air and correspond one-to-one with the multiple nozzles; The plurality of nozzles are used to eject ink droplets of uniform size with a first surface tension.

16. The printhead according to claim 15, wherein, The plurality of air ducts are used to spray airflow onto the ink droplets ejected from the plurality of nozzles at a second surface tension, wherein the second surface tension is different from the first surface tension.

17. The printhead according to claim 15 or 16, wherein, The first surface tension is the surface tension of the ink; or The plurality of nozzles and the plurality of air ducts are configured to operate alternately.

18. The printhead according to claim 17, wherein, The second surface tension is the surface tension of the air.

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