CN-121723533-B - Simulation method, device, equipment and storage medium for OLED (organic light emitting diode) ink-jet printing

CN121723533BCN 121723533 BCN121723533 BCN 121723533BCN-121723533-B

Abstract

The invention relates to the technical field of simulation, in particular to a simulation method, a device, equipment and a storage medium for OLED (organic light emitting diode) ink-jet printing, wherein the method solves the technical pain point that a single modeling frame is difficult to consider simulation precision and calculation efficiency in the prior art by configuring simulation resources in stages, dynamically judging stage switching and orderly transmitting stage information; specifically, the stages are divided according to the physical evolution law of the ink-jet process, so that models of the stages are accurately matched with a dominant physical mechanism, the dynamic characteristics of key behaviors such as ink supply response, liquid column necking, droplet morphology adjustment and the like are carefully described, the computational redundancy of non-key stages is reduced through a self-adaptive simplification strategy, continuous simulation from jet start to droplet deposition whole flow is realized, conservation and evolution consistency of physical quantity is ensured, simulation precision and computational efficiency are obviously improved compared with those of a traditional method, pixel deposition consistency is effectively improved, and the trial-and-error cost of an actual process is reduced.

Inventors

LIANG HAOQIAN
GONG JING
FENG JIAMING
Yang Guangmeng
ZENG XIANFENG
KUANG ZHANHUA

Assignees

季华实验室

Dates

Publication Date: 20260508
Application Date: 20260224

Claims (10)

1. A simulation method of OLED inkjet printing, comprising: acquiring preset input process parameters, and continuously acquiring current physical quantity in the simulation process; loading first configuration information corresponding to an initial formation stage, and executing simulation operation based on the first configuration information to calculate injection starting information; Judging whether entering conditions of a continuous liquid structure forming stage are met or not according to the input process parameters and the current physical quantity, if yes, loading second configuration information corresponding to the continuous liquid structure forming stage, and executing simulation operation based on the injection starting information and the second configuration information to calculate and obtain liquid column form information; Judging whether entering conditions of a liquid drop separation stage are met or not according to the current physical quantity, if yes, loading third configuration information corresponding to the liquid drop separation stage, and executing simulation operation based on the third configuration information and liquid column form information to calculate liquid drop information; Judging whether entering conditions of an initial flight stage are met or not according to the current physical quantity, if yes, loading fourth configuration information corresponding to the initial flight stage, and executing simulation operation based on the liquid drop information and the fourth configuration information to calculate and obtain stable liquid drop parameters; judging whether entering conditions of a stable flight stage are met or not according to the current physical quantity, if yes, loading fifth configuration information corresponding to the stable flight stage, and executing simulation operation based on the stable droplet parameters and the fifth configuration information to calculate and obtain final droplet deposition parameters; Integrating the jet start information, the liquid column shape information, the liquid drop information, the stable liquid drop parameters and the liquid drop final deposition parameters to form a simulation result, and guiding the OLED ink-jet printing operation based on the simulation result.
2. The method for simulating OLED inkjet printing according to claim 1, wherein the step of obtaining the preset input process parameters and continuously collecting the current physical quantity in the simulation process includes: acquiring preset input process parameters, wherein the input process parameters comprise nozzle parameters, ink physical property parameters, driving signal parameters and gas phase environment parameters; Continuously collecting current physical quantities in the simulation process, wherein the current physical quantities comprise a speed field, a pressure field, a liquid-gas interface state, a liquid geometric parameter and a kinetic parameter; And carrying out denoising treatment, complement treatment and standardization treatment on the current physical quantity in sequence to obtain the standardized physical quantity.
3. The method according to claim 2, wherein loading the first configuration information corresponding to the initial formation stage and performing a simulation operation based on the first configuration information to calculate ejection start information, comprises: Loading first configuration information corresponding to an initial formation stage, wherein the first configuration information comprises a first physical model, a first grid configuration, a first time step configuration and a first boundary condition, and the first physical model comprises an incompressible fluid continuity equation and a Navier-Stokes equation; Initializing a simulation calculation domain based on the first configuration information, and configuring initial state parameters of the simulation calculation domain; based on the input technological parameters and the standardized physical quantity, performing unsteady simulation calculation in the simulation calculation domain, and continuously monitoring the initial deformation state of the free liquid level; when the overhanging distance of the free liquid surface is more than or equal to 1/10 of the inner diameter of the nozzle, extracting jet start information, wherein the jet start information comprises a speed distribution time sequence curve at the outlet of the nozzle, a pressure change waveform in the nozzle, an initial displacement track of the free liquid surface and a start time point.
4. The method according to claim 3, wherein the step of determining whether the entry condition of the continuous liquid structure formation stage is satisfied according to the input process parameter and the current physical quantity, if yes, loading second configuration information corresponding to the continuous liquid structure formation stage, and performing a simulation operation based on the injection start information and the second configuration information to calculate liquid column morphology information, includes: Calculating a condition judgment value according to the standardized physical quantity, and judging whether entering conditions of a continuous liquid structure forming stage are met or not based on the input process parameters and the condition judgment value; if yes, loading second configuration information, wherein the second configuration information comprises a second physical model, a second grid configuration and a second time step configuration, the second physical model comprises a Navier-Stokes equation containing a CSF surface tension model and an interface tracking method, and the interface tracking method is a volume fraction method or a level set method; Introducing the jet start information as an initial condition into a current simulation calculation domain and starting simulation calculation, and continuously monitoring the length-diameter ratio and the morphological change rate of the liquid column; When the length-diameter ratio of the liquid column is more than or equal to 3 and the shape change rate is less than or equal to 5%, extracting liquid column shape information, wherein the liquid column shape information comprises the total length, the maximum diameter, the interfacial curvature distribution and the internal speed gradient of the liquid column.
5. The method according to claim 4, wherein the step of determining whether the entry condition of the droplet separation stage is satisfied according to the current physical quantity, if yes, loading third configuration information corresponding to the droplet separation stage, and performing a simulation operation based on the third configuration information and the liquid column morphology information to calculate droplet information, includes: judging whether entering conditions of a liquid drop separation stage are met or not according to the geometric parameters and the kinetic parameters of the liquid; If yes, loading third configuration information, wherein the third configuration information comprises a third physical model, a third grid configuration and a third time step configuration, and the third physical model adopts an interface tracking method of a continuous liquid structure forming stage; the liquid column shape information is imported into a current simulation calculation domain to initialize a necking fracture calculation module and boundary conditions of the current simulation calculation domain, then simulation calculation is executed, and the necking rate is continuously monitored; And when the necking rate is less than or equal to a preset fracture judgment threshold value, extracting droplet information, wherein the droplet information comprises the mass, equivalent radius, initial speed, surface morphology and fracture position coordinates of the droplet.
6. The method according to claim 5, wherein the determining whether the entry condition of the initial flight phase is satisfied according to the current physical quantity, if yes, loading fourth configuration information corresponding to the initial flight phase, and performing a simulation operation based on the droplet information and the fourth configuration information to calculate a stable droplet parameter, includes: Judging whether entering conditions of an initial flight stage are met or not according to the liquid-gas interface state, the liquid geometric parameters and the kinetic parameters; If yes, loading fourth configuration information, wherein the fourth configuration information comprises a fourth physical model, a fourth grid configuration and a fourth time step configuration, and the fourth physical model comprises a Lagrange momentum equation, an interface tracking model, a coupling Stokes resistance model and a Laplace pressure equation; The liquid drop information is imported into a current simulation calculation domain to initialize gas phase environment parameters and a liquid drop motion equation of the current simulation calculation domain, then simulation calculation is executed, and the trailing length and the interface curvature change rate are continuously monitored; When the trailing length is small and is less than or equal to the equivalent radius of the liquid drop 1/3 of the ratio of change of the interface curvature is less than or equal to And extracting stable liquid drop parameters, wherein the stable liquid drop parameters comprise stable equivalent radius of liquid drops, flight speed after adjustment and surface curvature uniformity.
7. The method according to claim 6, wherein the step of determining whether the entry condition of the stable flight phase is satisfied according to the current physical quantity, if yes, loading fifth configuration information corresponding to the stable flight phase, and performing a simulation operation based on the stable droplet parameter and the fifth configuration information to calculate a final droplet deposition parameter, includes: judging whether entering conditions of a stable flight stage are met or not based on the tailing length, the interface curvature change rate and the stable droplet parameters; if yes, loading fifth configuration information corresponding to a stable flight stage, wherein the fifth configuration information comprises a fifth physical model, a fifth grid configuration and a fifth time step configuration, and the fifth physical model comprises an equivalent particle dynamics model and an air resistance empirical formula; Introducing the stable droplet parameters into a current simulation calculation domain, initializing boundary conditions of a deposition surface, then executing a simulation calculation step, and continuously monitoring the distance between the droplet and the deposition surface; when the droplet reaches the deposition surface, droplet final deposition parameters are extracted, including deposition position coordinates, impingement speed, deposition morphology radius, and spreading area.
8. An emulation device for OLED inkjet printing, comprising: The acquisition module is used for acquiring preset input process parameters and continuously acquiring current physical quantity in the simulation process; The first simulation module is used for loading first configuration information corresponding to an initial formation stage and executing simulation operation based on the first configuration information so as to calculate and obtain injection starting information; The second simulation module is used for judging whether the entering condition of the continuous liquid structure forming stage is met according to the input process parameters and the current physical quantity, if yes, loading second configuration information corresponding to the continuous liquid structure forming stage, and executing simulation operation based on the injection starting information and the second configuration information so as to calculate and obtain liquid column form information; the third simulation module is used for judging whether the entering condition of the liquid drop separation stage is met according to the current physical quantity, if yes, loading third configuration information corresponding to the liquid drop separation stage, and executing simulation operation based on the third configuration information and the liquid column form information to calculate liquid drop information; The fourth simulation module is used for judging whether the entering condition of the initial flight stage is met according to the current physical quantity, if yes, loading fourth configuration information corresponding to the initial flight stage, and executing simulation operation based on the liquid drop information and the fourth configuration information to calculate and obtain stable liquid drop parameters; The fifth simulation module is used for judging whether the entering condition of the stable flight stage is met according to the current physical quantity, if yes, loading fifth configuration information corresponding to the stable flight stage, and executing simulation operation based on the stable droplet parameters and the fifth configuration information so as to calculate and obtain final deposition parameters of the droplets; And the integration module is used for integrating the jet start information, the liquid column form information, the liquid drop information, the stable liquid drop parameters and the liquid drop final deposition parameters to form a simulation result and guiding OLED ink-jet printing operation based on the simulation result.
9. An emulation device of OLED inkjet printing is characterized by comprising a memory and at least one processor, wherein instructions are stored in the memory; at least one of the processors invokes the instructions in the memory to cause the simulation device of OLED inkjet printing to perform the steps of the simulation method of OLED inkjet printing according to any one of claims 1-7.
10. A computer readable storage medium having instructions stored thereon, which when executed by a processor, implement the steps of the simulation method of OLED inkjet printing according to any of claims 1-7.

Description

Simulation method, device, equipment and storage medium for OLED (organic light emitting diode) ink-jet printing Technical Field The invention relates to the technical field of simulation, in particular to a simulation method, device and equipment for OLED (organic light emitting diode) inkjet printing and a storage medium. Background The ink jet printing process has been widely used in the fields of micro-nano structure preparation, functional material deposition and display, electronic device manufacturing, etc. by virtue of the advantages of high material utilization rate, flexible process path, capability of realizing on-demand deposition and patterning control, etc., and has become one of core processes in particular in the manufacture of Organic Light Emitting Diodes (OLEDs) with extremely high requirements on material utilization efficiency and deposition accuracy. The OLED ink-jet printing process is a typical unsteady free interface flow problem and comprises a plurality of unsteady stages of ink supply response inside a nozzle, free liquid level extension, continuous liquid structure formation and fracture, movement of liquid drops in a gas phase space and the like, wherein the different stages have significant differences in dominant mechanical mechanisms (relative action of inertia force, viscosity force and surface tension), time scale and space scale, and the dynamic behavior is highly sensitive to process parameter changes. The existing numerical analysis method for inkjet printing mostly takes final jet result characteristics such as the geometric dimension of liquid drops, the deposition position and the like as core targets, realizes simulation evaluation by establishing corresponding relations between technological parameters and result characteristics, brings the whole inkjet process into a unified simplified modeling framework, adopts a single physical model, a control equation and a numerical strategy for integrated processing, and can meet macroscopic parameter evaluation and trend judgment requirements, but has obvious limitations that firstly, dominant physical mechanism differences at different stages are difficult to carefully describe, secondly, inkjet dynamics response differences caused by technological parameter changes cannot be accurately reflected, thirdly, balance is difficult to realize between fine process analysis and quick parameter evaluation required by an OLED inkjet printing process, and sufficient simulation support cannot be provided for jet stability optimization and technological parameter adjustment. It can be seen that there is a need for improvements and improvements in the art. Disclosure of Invention In order to overcome the defects of the prior art, the invention aims to provide the simulation method for OLED inkjet printing, which realizes the collaborative optimization of simulation precision and calculation efficiency by definitely associating stages, quantifying configuration basis and refining switching rules. The first aspect of the invention provides a simulation method for OLED ink-jet printing, which comprises the steps of obtaining preset input process parameters, continuously collecting current physical quantity in a simulation process, loading first configuration information corresponding to an initial forming stage, executing simulation operation based on the first configuration information to calculate and obtain jet start information, judging whether entering conditions of a continuous liquid structure forming stage are met according to the input process parameters and the current physical quantity, loading second configuration information corresponding to the continuous liquid structure forming stage, executing simulation operation based on the jet start information and the second configuration information to calculate and obtain liquid column form information, judging whether entering conditions of a liquid drop separation stage are met according to the current physical quantity, loading third configuration information corresponding to the liquid drop separation stage, executing simulation operation based on the third configuration information and the liquid column form information to calculate and obtain liquid drop information, judging whether entering conditions of an initial flight stage are met according to the current physical quantity, loading fourth configuration information corresponding to the initial flight stage, executing simulation operation based on the liquid drop information and the fourth configuration information to calculate and obtain liquid column form information, judging whether the current droplet separation stage is met, and the droplet deposition operation parameters are stable, and the final droplet deposition parameters are calculated and stable based on the stable droplet deposition parameters are obtained, and directing an OLED inkjet printing operation based on the simulation result. Optionally, in a first