CN113199867B - Electrofluid jet patterning induction method and system - Google Patents
Electrofluid jet patterning induction method and system Download PDFInfo
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- CN113199867B CN113199867B CN202110386458.5A CN202110386458A CN113199867B CN 113199867 B CN113199867 B CN 113199867B CN 202110386458 A CN202110386458 A CN 202110386458A CN 113199867 B CN113199867 B CN 113199867B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/04505—Control methods or devices therefor, e.g. driver circuits, control circuits aiming at correcting alignment
Abstract
The invention discloses an electrofluid jet patterning induction method, which comprises the following steps: applying a spray-inducing electric field at the nozzle to induce the nozzle to spray droplets; applying a track induction electric field to the ejected liquid drops to regulate and control the flight speed of the liquid drops; and acquiring a droplet flight image in real time, positioning the droplet, comparing the droplet flight speed obtained by positioning with the target flight speed, and regulating and controlling the track induction electric field according to the error obtained by comparison so as to induce the droplet to fly to the target deposition position. The invention also discloses a system for realizing the method, which comprises a nozzle, a jet induction mechanism, a track induction mechanism and a track observation vision group. The invention forms a track induction electric field around the flight track of the liquid drop, and adopts visual feedback control to accurately induce the liquid drop to fly to a target deposition position.
Description
Technical Field
The invention belongs to the technical field related to electrohydrodynamic jet printing, and particularly relates to an arrayed electrohydrodynamic jet patterning induction method and system.
Background
The electrohydrodynamic jet printing is different from the traditional ink-jet printing, a Taylor cone is formed by the combined action of a high-voltage electric field between a nozzle and a substrate and the surface tension of a solution for jet, and the patterned printing with high precision and high viscosity adaptive range can be realized. However, under the action of a high-voltage electric field, the printed jet flow or droplets all have certain charges, and the charged liquid is prone to track deviation under the action of electric field force in the electric field, which is particularly serious in arrayed printing, and this directly affects the deposition control accuracy of the droplets and further affects the patterning quality of the droplets.
In the prior art, for the trajectory deviation phenomenon, generally, a method of designing a hydrophilic and hydrophobic structure on a substrate is used to make droplets with shifted deposition positions approach a hydrophilic target area, or an air flow assisted method is used to guide the flight trajectory of the droplets. However, the above solution still has significant problems: first, the hydrophilic-hydrophobic design can only slightly enlarge the depositable area and is still limited by the pattern arrangement density and the hydrophilicity of the droplets themselves; second, the directing of the air flow provides only a general direction of induction, with less precision, and the air flow is prone to interfere with each other during arrayed printing causing additional errors.
Disclosure of Invention
Aiming at the existing problems of electrofluid jet printing and the defects of the prior art, the invention provides an electrofluid jet patterning induction system and method, a track induction electric field is formed around the flight track of liquid drops, and the liquid drops are accurately induced to fly to a target deposition position by adopting visual feedback control.
In order to realize the technical purpose of the invention, the invention adopts the following technical scheme:
an electrofluid jet patterning induction method comprises the following steps:
applying a spray-inducing electric field at the nozzle to induce the nozzle to spray droplets; applying a track induction electric field to the ejected liquid drops to regulate and control the flight speed of the liquid drops; and acquiring a droplet flight image in real time, positioning the droplet, calculating the error between the droplet flight speed obtained by positioning and the target flight speed, and regulating and controlling the track induction electric field according to the error so as to induce the droplet to fly to the target deposition position.
Further, collecting a droplet deposition image, positioning droplets, calculating an error between a droplet deposition position obtained by positioning and a target deposition position, and regulating and controlling the track induction electric field according to the error so as to induce the droplets to be deposited at the target deposition position; or/and acquiring a nozzle jet image, extracting the diameter of the liquid drop, calculating the error between the diameter of the liquid drop and the volume of the target liquid drop, and regulating and controlling the jet induction electric field according to the error.
Further, the ejection-inducing electric field is shielded while applying the trajectory-inducing electric field to the liquid droplets.
An electrofluid jet patterning induction system comprises a nozzle, a jet induction mechanism, a track induction mechanism and a track observation visual group; the spray induction mechanism is used for forming a spray induction electric field at the nozzle so as to induce the nozzle to spray liquid drops; the track induction mechanism is used for applying a track induction electric field to the sprayed liquid drops so as to regulate and control the flight speed of the liquid drops; and the track observation visual group is used for acquiring a droplet deposition image in real time, positioning droplets, calculating an error between a droplet deposition position obtained by positioning and a target deposition position, and regulating and controlling the track induction electric field according to the error so as to induce the droplets to fly to the target deposition position.
The system further comprises a deposition observation visual group, a target deposition position and a track induction voltage signal, wherein the deposition observation visual group is used for acquiring a droplet deposition image in real time, positioning a droplet, calculating an error between a droplet deposition position obtained by positioning and the target deposition position, and regulating and controlling the track induction voltage signal according to the error so as to induce the droplet to be deposited at the target deposition position; or/and the device also comprises a jet observation visual group which is used for acquiring a jet image of the nozzle, extracting the diameter of the liquid drop, calculating the error between the diameter of the liquid drop and the volume of the target liquid drop and regulating and controlling the jet induction electric field according to the error.
Further, the trajectory induction unit comprises a ring-shaped electrode and a trajectory induction control unit; the track induction control unit is used for outputting a track induction voltage signal; the annular electrode is used for generating a track induction electric field under the action of a track induction voltage signal, and is an annular electrode or consists of a plurality of circumferentially and uniformly distributed electrodes.
Further, the trajectory inducing electric field unit further includes a ground electrode disposed below the ring-shaped electrode for confining the trajectory inducing electric field between the ring-shaped electrode and the ground electrode.
Further, the spray induction mechanism comprises a double-electrode ring and a spray induction control unit; the injection induction control unit is used for outputting an injection induction voltage signal; the double-electrode ring comprises an upper electrode ring and a lower electrode ring, the upper electrode ring is used for receiving jet induction voltage signals and forming a jet induction electric field, the lower electrode ring is grounded and forms a potential difference with the upper electrode, and the jet induction electric field is shielded so as to avoid interference on the track induction electric field.
An electrofluidic array jet patterning induction system includes an array of nozzles and an electrofluidic array jet patterning induction system provided for each nozzle.
Further, the device also comprises a spray induction isolation plate which is arranged at each nozzle and surrounds the spray induction mechanism and is used for shielding a spray induction electric field between the adjacent nozzles; and/or further comprising a trajectory-inducing spacer disposed below each nozzle and surrounding the trajectory-inducing mechanism for shielding a trajectory-inducing electric field between adjacent nozzles.
Generally, compared with the prior art, the above technical solution according to the present invention mainly has the following technical advantages:
the invention provides a track induction method and a track induction system based on electrostatic field guidance, which closely surround the core problem of charged liquid drop track control in electrofluid jet printing, form an induction electric field around a liquid drop flight track, acquire image information including the position and the speed of the liquid drop in the flight process in real time by using an observation vision group, analyze and process the image information, compare an analysis result with a target value, and correspondingly change the track induction electric field, thereby guiding the liquid drop deviating from a preset track due to electric field disturbance, air flow interference and the like to fly to a target deposition position. Compared with the existing track regulation and control mode, the method has wider application range and higher deposition control precision, and can realize high-precision electrofluid jet patterning printing.
Furthermore, the invention preferably collects the droplet ejection diameter and deposition position, adopts automatic closed-loop feedback control which is the same as the track feedback regulation strategy, increases the online error compensation of ejection and deposition on the basis of online error compensation of flight, further improves the printing precision, is suitable for various printing occasions, is not limited by factors such as printing materials, substrate conductivity, solution properties and the like, and has higher patterned deposition control precision.
Further, the implementation body of the trajectory induction mechanism of the present invention may be composed of one ring-shaped electrode or a plurality of circumferentially uniformly distributed electrodes. Preferably, a plurality of electrodes which are uniformly distributed in the circumferential direction are adopted, so that multi-pole regulation and control can be realized, the flexibility is higher, and the response is faster and more accurate.
Further, because the invention introduces the track-induced electric field in the flying process, and the track-induced electric field and the spray-induced electric field are easy to generate mutual interference, the invention shields the spray-induced electric field while applying the track-induced electric field to the liquid drops, thereby solving the interference problem. In the device for realizing the method, the injection inducing mechanism adopts a double-electrode ring, the upper electrode ring receives an injection inducing voltage signal and forms an injection inducing electric field, the lower electrode ring is grounded and used for forming a potential difference with the upper electrode and shielding the injection inducing electric field so as to avoid interference on the track inducing electric field, and the device has the advantages of simple structure, easy realization and good shielding effect.
Furthermore, the invention can be expanded to large-scale array jet patterning printing, the induction system is arranged for each nozzle, the jet induction electric field and the track induction electric field can be independently and accurately controlled, and the printing precision of each nozzle can be ensured, so that the array printing precision is ensured. Preferably, for the array nozzles, the injection inducing isolation plate and the track inducing isolation plate are arranged between the adjacent nozzles to respectively shield the injection inducing electric field between the adjacent nozzles and the track inducing electric field corresponding to the injection inducing electric field, so that mutual interference is prevented, the control difficulty is further reduced, and the printing precision is improved.
Drawings
FIG. 1 is a schematic diagram of the overall configuration of a single nozzle electrofluidic jet patterning induction system of the present invention;
FIG. 2 is a schematic diagram of a polygonal ring electrode in accordance with a preferred embodiment of the present invention;
FIG. 3 is a schematic diagram of the overall process control for droplet generation, flight, deposition in accordance with the present invention;
FIG. 4 is a schematic illustration of a spray waveform according to a preferred embodiment of the present invention;
FIG. 5 is a schematic view for exemplarily illustrating an electro-fluid jet patterning induction process according to the present invention;
FIG. 6 is a schematic diagram of the overall configuration of the arrayed electrohydrodynamic jet patterning system of the present invention;
fig. 7 is a schematic circuit control diagram of a combined polygonal electrode mesh plate according to a preferred embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1:
FIG. 1 shows a preferred embodiment of a single nozzle electrofluidic jet patterning induction system. The system shown in fig. 1 comprises a nozzle 1, a spray induction mechanism 2, a vision inspection module 3 and a trajectory induction mechanism 4.
The ejection inducing mechanism 2 includes a bipolar electrode ring 21 and an ejection inducing control unit 23. The bipolar ring 21 includes an upper electrode ring and a lower electrode ring. The upper electrode ring is connected with a voltage signal for providing a high-voltage electric field required by printing, the lower electrode ring is connected with the ground for forming a potential difference together with the upper electrode ring, and the high-voltage electric field in the jet induction module is shielded, so that the normal work of the track induction regulation and control module 4 is guaranteed. The ejection induction control unit 23 receives an external control command, and adjusts the voltage waveform signal applied to the upper electrode ring according to the command.
The trajectory induction mechanism 4 includes a ring electrode 41 and a trajectory induction control unit 43. Under the control of the trajectory induction control unit 43, the annular electrode 41 correspondingly adjusts the electrode on state and the corresponding voltage waveform to form an induced regulation electric field for controlling the flight of the droplets, thereby dragging the droplets to fly to the target deposition position. The trajectory induction control unit 43 receives an external control signal and controls the voltage waveform applied to the ring electrode 41.
The ring electrode 41 may be a single ring electrode, but can be only modulated in a single manner. In the present embodiment, the ring electrode 41 is an n-sided polygon (polygon ring electrode for short) formed by n electrodes, and a polygon electrode control circuit in the present embodiment where n is 4 is shown in fig. 2. It should be noted that the number of n is not limited, and the polygon electrode control circuit diagrams with different numbers of sides are different. The voltage waveform signals of the electrodes on the polygonal electrodes are correspondingly adjusted by the control signals transmitted by the trajectory induction control unit 44, so that corresponding induction electric fields are formed, and the droplet trajectory induction is realized. Specifically, the trajectory induction control signal transmitted to the trajectory induction control unit is in a vector form, and can be decomposed into an electric field signal in the X direction and an electric field signal in the Y direction, which correspond to the adjustment electrode pairs 412 and 414 and the electrode pairs 411 and 413, respectively. Taking the X-direction electric field signal control as an example, when the electric field signal is in the X positive direction, the corresponding high voltage is connected to the electrode 414, and the value is the strength of the control signal, at this time, the corresponding electric field pointing to the X positive direction can be generated, so as to further guide the liquid drop to fly in the X positive direction, and vice versa. The flying speed of the liquid drops is continuously corrected through feedback adjustment in the flying process until the liquid drops are separated from the action range of the track induction control unit and gradually fly to a preset deposition position.
In operation, the annular electrode 41 may cooperate with a substrate on which a pattern is printed to form a track-inducing electric field, and preferably, the present embodiment adds the ground electrode 42 between the annular electrode 41 and the substrate, so as to limit the track-inducing electric field between the annular electrode 41 and the ground electrode 42, and the height adjustment of the ground electrode 42 may limit the influence area of the induced electric field, so as to stabilize the deposition process.
The visual inspection module 3 includes three visual inspection modules of an injection observation visual group 31, a trajectory observation visual group 32 and a deposition observation visual group 33.
In this embodiment, each module includes two cameras placed at different angles, a light source, a lens, image processing software, and a control module. In the present embodiment, three vision inspection modules share one control module 5. FIG. 3 is a schematic diagram of the overall process control of droplet generation, flight and deposition according to the present invention.
The ejection observation visual group 31 is used for observing the droplet form during printing, analyzing droplet diameter information according to the acquired image information, determining the position of the nozzle, and performing auxiliary correction of the spatial position of the nozzle before printing. The track observation visual group 32 is used for observing the position of the liquid drop in the flying process and obtaining the flying track, the speed, the direction and other information of the liquid drop according to the collected pattern information. The deposition observation vision group 33 is used for observing the deposition position of the liquid drop on the substrate, and comparing the deposition position with the target deposition position to obtain the deposition position deviation information of the liquid drop.
The visual detection module 3 analyzes and processes the acquired image information and outputs an injection induction regulation signal t and a track induction regulation signal
Deposition error compensation regulation signal
And waiting for a series of regulation waveform signals, and correspondingly sending the regulation waveform signals to the jet induction module 2 and the track regulation induction module 4.
According to another preferred embodiment of the present invention, the control signal t may be generated for the injection induction control unit 23 according to the following formula:
the ejection induction control unit 23 adjusts the pulse width of the printing voltage of the upper electrode ring in real time after receiving the pulse width adjustment signal t sent by the external control module 5, and the adjustment process is shown in fig. 4, where the left side shows the waveform change in one adjustment and control period, the dotted line and solid line waveforms respectively represent the voltage waveforms before and after adjustment, and the right side shows the overall change trend of the waveform with time under the adjustment and control of the closed-loop control system.
Furthermore, in accordance with another preferred embodiment of the present invention, the control module preferably employs closed loop control for droplet flight trajectory induction. The whole process is divided into twoThe first stage, which is divided by the relative height of the droplet and the ring electrode 41, is the droplet above the ring electrode 41, and the purpose of the velocity correction is induced, preferably according to the following formula, which provides the velocity correction signal to the trajectory induction control unit 44
The droplet is under the ring electrode 41 in a second phase which induces a correction of the landing position for the purpose, preferably according to the following formula providing a position correction signal to the trajectory induction control unit
Wherein m is the mass of a single charged droplet; v. ofx、vy、vzDividing into the speeds of the liquid drops in the X direction, the Y direction and the Z direction; d is the distance between any two opposite electrodes of the polygonal annular electrode;
is a direction vector representing the velocity direction of the drop in the XOY plane; the lambda is an electric field comprehensive influence factor, and the specific numerical value is obtained by repeatedly calibrating experiments; q is the charge of a single droplet; h is1The distance between the polygonal annular electrode and the lower electrode ring is set; h is2The distance between the polygonal annular electrode and the grounding electrode;
is the position offset vector of the drop at the beginning of trajectory control.
Furthermore, in accordance with another preferred embodiment of the present invention, the control module is preferablyThe deposition error compensation control signal is provided to the trajectory induction control unit 44 according to the following equation
Thereby performing the full droplet deposition error compensation process:
wherein the content of the first and second substances,
is the offset vector of the droplet deposition location from the target deposition location.
Furthermore, in accordance with another preferred embodiment of the present invention, the trajectory induction control unit 44 preferably assigns a voltage waveform signal V to each electrode according to the following formulae：
Wherein
An induced electric field required for regulation and control; n is the number of electrodes of the ring-shaped electrode 41; veThe voltage applied to the e-th electrode;
the direction vector represents the direction of the electric field component generated by the e-th electrode in the direction of the perpendicular bisector.
Fig. 5 is a schematic view for exemplarily illustrating a process flow of controlling an electro-fluid ejection patterning inducing system according to the present invention. Accordingly, the method comprises the steps of:
first, the whole system is initialized, and various designated parameters, such as the expected single drop volume V, are input according to the actual process requirements0Expected deposition coordinate (x)0,y0,z0) Etc.;
then, according to the requirement of the input parameters, the control module 5 sends a signal waveform corresponding to the induced electric field to the jetting induction control unit 23, and the jetting induction control unit 23 adjusts the voltage applied to the bipolar ring, so that a corresponding jetting induction electric field is formed near the nozzle, and further, a proper jet flow can be printed, thereby meeting the process requirement.
Then, the jet observation vision group 31 captures jet state information, collects a plurality of jet image information in each regulation and control period, the control module processes the acquired jet average diameter information and compares the acquired jet average diameter information with the target droplet volume, optimizes the voltage signal waveform t according to the comparison information and sends the voltage signal waveform t to the jet induction control unit 23, and the jet induction control unit 23 further adjusts each electrode voltage waveform signal on the combined ring electrode screen plate to realize closed-loop feedback regulation on the printing jet form.
Then, the trajectory observation vision group 32 captures flying droplet state information, collects a plurality of droplet flying image information in each regulation and control period and feeds back the information to the control module 5, the control module analyzes the image to obtain the average level of information such as space coordinates, flying speed and direction when the droplets enter the action range of the trajectory induction mechanism, and outputs a trajectory induction regulation and control signal after processing
And sent to the trajectory induction control unit 43 to further regulate the on state of the ring electrodes and the voltage waveform signals, and change the trajectory induction electric field, so that the droplets fly toward the target deposition position.
Finally, the deposition observation vision group 33 captures droplet deposition position information, collects a plurality of deposition image information in each regulation and control period and feeds back the deposition image information to the control module 5, the control module 5 analyzes an average offset vector between the deposition position and a preset position according to the image, and a deposition error compensation regulation and control signal is output after processing
And sent to the track regulation and control induction mechanism to change the track induction electric field,enabling the droplets to be deposited at predetermined locations.
It should be noted that the preferred embodiment is three-step online error compensation of jetting, flying and depositing, and the online compensation of jetting and depositing is not an essential feature and can be reduced or increased according to the precision requirement.
Example 2:
this example is an electrofluidic jet patterning induction system that expands the single nozzle embodiment of fig. 1 to an array of nozzles, as shown in fig. 6.
Array shower nozzle module 1 constitutes as the basic hardware of printing in this embodiment, wholly arranges through the space array of multirow nozzle to constitute in order to improve the whole printing rate of shower nozzle, and wherein every row of nozzle becomes certain inclination and arranges, guarantees that the liquid drop that the nozzle that corresponds sprayed has the uniformity under the array arrangement, can fuse on the base plate.
In the spray induction mechanism 2 of the present embodiment, a spray induction isolation plate 22 is added to the spray induction mechanism of embodiment 2. The whole injection induction isolation screen plate 22 is of a hollow honeycomb structure, a series of conducting wires are arranged in the injection induction isolation screen plate, a high-voltage electric field near each independent nozzle is shielded by guiding the principle of electrostatic shielding, electric field interference is prevented from occurring during simultaneous printing, and it is ensured that arrayed printing can be stably carried out.
In the embodiment, the track induction mechanism 4 is additionally provided with a track induction isolation plate 43 on the basis of the embodiment 2, and the overall structure of the track induction isolation plate is similar to that of a jet induction isolation plate and is used for isolating an induction electric field below each nozzle in arrayed printing, so that the stability of the induction electric field is ensured. The trajectory induction spacer 43 may adopt the same structure as the jet induction spacer plate 22.
Fig. 7 is a schematic circuit control diagram of the arrayed polygonal ring electrodes according to the present invention, which takes the track control inducing unit as a core and transmits the electric field signal required by each inducing electrode through the meshed built-in wires. Meanwhile, for all the electrodes, the other ends of the electrodes are grounded after being combined through the conducting wires, and the stability of the track induction electric field is guaranteed.
In summary, the core problem of pattern induction control of the arrayed fluidic printing is closely surrounded, and not only an electrostatic field guided arrayed printing and trajectory induction system is provided, but also the specific processes and processing procedures thereof are described. The whole system is based on automatic closed-loop feedback control, can realize periodic online error compensation, is suitable for various printing occasions, is not limited by factors such as printing materials, substrate conductivity, solution properties and the like, and has higher patterned deposition control precision.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. An electrofluid jet patterning induction method is characterized by comprising the following specific steps:
applying a spray-inducing electric field at the nozzle to induce the nozzle to spray droplets; the jet induction electric field is generated by a jet induction mechanism, and the jet induction mechanism comprises an upper electrode ring and a lower electrode ring which form a double-electrode ring and a jet induction control unit;
applying a track induction electric field to the ejected liquid drops to regulate and control the flight speed of the liquid drops;
collecting a droplet flight image in real time, positioning droplets, calculating an error between the droplet flight speed obtained by positioning and the target flight speed, and regulating and controlling the track induction electric field according to the error so as to induce the droplets to fly to a target deposition position;
the track-induced electric field is generated by electrifying a polygonal annular electrode, wherein the polygonal annular electrode is formed by n electrodes into an n-edge polygon and is arranged between the nozzle and the liquid drop deposition substrate; dividing the relative height of the liquid drop and the polygonal ring electrode into a first stage above the polygonal ring electrode for inducing speed correction, and a second stage below the polygonal ring electrode for inducing landing position correctionA grounding electrode is additionally arranged between the electrode and the substrate; the velocity correction signal of the first stage
Produced as follows:
wherein m is the mass of a single charged droplet;
the speeds of the liquid drops in the X direction, the Y direction and the Z direction respectively; d is the distance between any two opposite electrodes of the polygonal annular electrode;
is a direction vector representing the velocity direction of the drop in the XOY plane;
is a comprehensive influence factor of an electric field;
the charge amount for a single droplet;
the distance between the polygonal annular electrode and the lower electrode ring is set;
the second stage provides a position correction signal as follows
：
Wherein m is a single charged dropletThe mass of (c);
the speeds of the liquid drops in the X direction, the Y direction and the Z direction respectively; d is the distance between any two opposite electrodes of the polygonal annular electrode;
is a direction vector representing the velocity direction of the drop in the XOY plane;
is a comprehensive influence factor of an electric field;
the charge amount for a single droplet;
the distance between the polygonal annular electrode and the lower electrode ring is set;
the distance between the polygonal annular electrode and the grounding electrode;
is the position offset vector of the drop at the beginning of trajectory control.
2. The electrofluidic jet patterning induction method of claim 1, further calculating an error between the located droplet deposition location and the target deposition location, generating a deposition error compensation control signal based on the error
Regulating the trajectory-inducing electric field to induce the droplet to deposit at the target deposition location:
wherein the content of the first and second substances,
is the offset vector of the droplet deposition location from the target deposition location,
is the position correction signal of the second stage, m is the mass of a single charged liquid drop, d is the distance between any two opposite electrodes of the polygonal annular electrode,
is a comprehensive influence factor of an electric field,
is the amount of charge of a single droplet,
is the velocity of the droplet in the Z direction,
the distance between the polygonal annular electrode and the grounding electrode.
3. The electrofluid ejection patterning induction method according to claim 1, wherein the ejection-inducing electric field is generated by a bipolar ring disposed at a showerhead, the bipolar ring being composed of an upper electrode ring and a lower electrode ring; the upper electrode ring is connected with a voltage signal to provide a high-voltage electric field required by printing, and the lower electrode ring is grounded to form a potential difference together with the upper electrode ring; a control signal of the jet-induced electric field
Produced as follows:
wherein the content of the first and second substances,
representing a print voltage frequency;
is the expected drop volume;
is the transition coefficient from jet diameter to droplet diameter; d is the jet diameter;
representing the equivalent supply flow.
4. An electrofluidic jet patterning induction system comprising a nozzle, characterized in that the electrofluidic jet patterning induction method of any one of claims 1-3 is used, further comprising: the system comprises a jet induction mechanism, a track induction mechanism and a track observation visual group;
the spray induction mechanism is used for forming a spray induction electric field at the nozzle so as to induce the nozzle to spray liquid drops; the jet induction mechanism comprises a double-electrode ring consisting of an upper electrode ring and a lower electrode ring and a jet induction control unit;
the track induction mechanism is used for applying a track induction electric field to the sprayed liquid drops so as to regulate and control the flight speed of the liquid drops; the track induction unit comprises a polygonal annular electrode and a track induction control unit; the track induction control unit is used for receiving an error signal output by the track observation visual group and regulating the track induction electric field according to the error output track induction voltage signal so as to induce the liquid drops to fly to a target deposition position; the polygonal annular electrode is used for generating a track induction electric field under the action of a track induction voltage signal; the polygonal annular electrode is formed into an n-edge polygon by n electrodes and is arranged between the nozzle and the liquid drop deposition substrate; dividing the relative height of the liquid drop and the polygonal annular electrode, wherein the liquid drop above the polygonal annular electrode is a first stage, the purpose of inducing the liquid drop is speed correction, the purpose of inducing the liquid drop below the polygonal annular electrode is a second stage, the purpose of inducing the liquid drop below the polygonal annular electrode is landing position correction, and a grounding electrode is additionally arranged between the polygonal annular electrode and the substrate;
the track observation visual group is used for acquiring a droplet deposition image in real time, positioning droplets, calculating an error between the flying speed of the positioned droplets and the target flying speed, and sending the error to the track induction control unit;
the velocity correction signal of the first stage
Produced as follows:
wherein m is the mass of a single charged droplet;
the speeds of the liquid drops in the X direction, the Y direction and the Z direction respectively; d is the distance between any two opposite electrodes of the polygonal annular electrode;
is a direction vector representing the velocity direction of the drop in the XOY plane;
is a comprehensive influence factor of an electric field;
the charge amount for a single droplet;
the distance between the polygonal annular electrode and the lower electrode ring is set;
the second stage provides a position correction signal as follows
：
Wherein m is the mass of a single charged droplet;
the speeds of the liquid drops in the X direction, the Y direction and the Z direction respectively; d is the distance between any two opposite electrodes of the polygonal annular electrode;
is a direction vector representing the velocity direction of the drop in the XOY plane;
specific numerical values are obtained by repeatedly calibrating experiments for multiple times, wherein the specific numerical values are comprehensive influence factors of an electric field;
the charge amount for a single droplet;
the distance between the polygonal annular electrode and the lower electrode ring is set;
the distance between the polygonal annular electrode and the grounding electrode;
is the position offset vector of the drop at the beginning of trajectory control.
5. The electrofluidic jet patterning guidance system of claim 4 further comprising a deposition observation vision group for acquiring droplet deposition images and positioning droplets in real time, calculating the error between the positioned droplet deposition location and the target deposition location, the trajectory guidance control unit generating a deposition error compensation control signal based on the error
Regulating the track induction voltage signal to induce the liquid drop to be deposited at the target deposition position;
wherein the content of the first and second substances,
is the offset vector of the droplet deposition location from the target deposition location,
is the position correction signal of the second stage, m is the mass of a single charged liquid drop, d is the distance between any two opposite electrodes of the polygonal annular electrode,
is a comprehensive influence factor of an electric field,
is the amount of charge of a single droplet,
is the velocity of the droplet in the Z direction,
the distance between the polygonal annular electrode and the grounding electrode.
6. The electrohydrodynamic jet patterning induction system according to claim 4 or 5, characterized in that the jet induction mechanism comprises a bipolar ring (21) and a jet induction control unit (23); the double-electrode ring (21) comprises an upper electrode ring and a lower electrode ring; the upper electrode ring is connected with a voltage signal to provide a high-voltage electric field required by printing, and the lower electrode ring is grounded to form a potential difference together with the upper electrode ring; the jet induction control unit (23) receives an external control instruction and adjusts a voltage waveform signal applied to the upper electrode ring according to the instruction; a control signal of the jet-induced electric field
Produced as follows:
wherein the content of the first and second substances,
representing a print voltage frequency;
is the expected drop volume;
the transition coefficient from jet diameter to drop diameter; d is the jet diameter;
representing the equivalent supply flow.
7. An electrofluidic array jet patterning induction system comprising an array of nozzles and an electrofluidic jet patterning induction system provided for each nozzle, the electrofluidic array patterning induction system being a system according to any of claims 4-6.
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| CN113959350B (en) * | 2021-11-03 | 2023-11-28 | Tcl华星光电技术有限公司 | Ink jet printing detection system and detection method |
| CN114475015B (en) * | 2022-02-22 | 2023-03-28 | 南京微毫科技有限公司 | Focusing electric field structure electrostatic spraying direct writing system and direct writing method |
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