Laser transfer printing control method and device, electronic equipment and medium

Abstract

The invention provides a laser transfer printing control method and device, electronic equipment and a medium, and the method comprises the steps that after a donor film reaches a printing position, a first method is executed, and the first method comprises the steps that position information of a reference groove in the donor film is obtained; according to the position information of the reference grooves, the position corresponding relation between each reference groove used for printing the first receptor substrate and the virtual main axis in the first direction is obtained; the position corresponding relation of each reference groove used for the first single plate transfer printing and the virtual main shaft in the first direction serves as the coordinate of a key point, and an electronic cam curve of a first linear moving shaft used for single plate transfer printing is obtained; in the transfer printing process, a second method is executed, and the second method comprises the steps that every time the light emitting device starts the laser, the current actual position of the virtual spindle is obtained; according to the current actual position of the virtual spindle and the constant x, a speed correction value of the virtual spindle is obtained, and the speed correction value of the virtual spindle is used for correcting the reference speed of the virtual spindle in real time.

Description

Technical Field

[0001] The present application relates to the technical field of laser transfer printing, and particularly to a control method, device, electronic device and medium for laser transfer printing by laser transfer printing. Background Art

[0002] Laser transfer printing is to fill a paste in a groove on a donor film. Applying the principle of laser irradiation, the contact surface between the paste and the donor film is heated and evaporated first to generate a vapor pressure, so that the paste and the donor film are separated and fall onto the surface of a photovoltaic cell to form grid lines. Laser transfer printing can effectively reduce the amount of paste used, and the printed grid lines are narrower, thereby improving the photoelectric conversion efficiency. However, laser transfer printing has very high requirements for the servo motion control accuracy, and it is necessary to ensure the high precision and high stability of the light-emitting device during the movement to achieve accurate printing of grid lines. However, the traditional control method is difficult to meet the requirements of laser transfer printing for printing accuracy, thus restricting the application of laser transfer printing technology. Summary of the Invention

[0003] In view of this, the present application provides a control solution for laser transfer printing. By obtaining the actual position confidence information of the grooves on the donor film at the printing position, the electronic self-cam trajectory is dynamically corrected, greatly improving the printing accuracy of laser transfer printing.

[0004] According to the first aspect of the embodiments of the present application, a control method for laser transfer printing is provided, including:

[0005] After the donor film reaches the printing position, execute a first method, where the first method includes:

[0006] Obtain the position information of the reference grooves on the donor film; wherein, when a piece of donor film is used to print one receptor substrate, the reference grooves include the first groove, the last groove, and equally spaced grooves between the first groove and the last groove; when a piece of donor film is used to print more than two receptor substrates, the reference grooves include the first groove for printing each receptor substrate, the last groove for printing the first receptor substrate, and equally spaced grooves between the first groove and the last groove for printing the first receptor substrate;

[0007] According to the position information of the reference grooves, obtain the position correspondence relationship between each reference groove for printing the first receptor substrate and the virtual main axis in the first direction; wherein, the position difference between the virtual main axes corresponding to every two adjacent reference grooves for printing the first receptor substrate is the product of a constant △x and (n + 1), where n is used to represent the number of grooves spaced between two adjacent equally spaced grooves;

[0008] Taking the position correspondence relationship between each reference groove for the first single-board transfer and the virtual main shaft in the first direction as the coordinates of the key points, an electronic cam curve of the first linear movement axis for single-board transfer is obtained, and the first linear movement axis is used to drive the light-emitting device to move along the first direction;

[0009] During the transfer process, a second method is executed, where the second method includes:

[0010] Whenever the light-emitting device turns on the laser, obtain the current actual position of the virtual main shaft;

[0011] According to the current actual position of the virtual main shaft and the constant Δx, obtain a speed correction value for the virtual main shaft, and the speed correction value of the virtual main shaft is used to perform real-time correction on the reference speed of the virtual main shaft.

[0012] Optionally, the electronic cam curve of the first linear movement axis for single-board transfer sequentially includes a synchronization section, a transfer section, and a deceleration stop section, where the transfer section is between the first key point and the last key point, and the difference between the starting point of the electronic cam curve and the abscissa of the first key point is equal to k*Δx, where k ranges from 5 to 20.

[0013] Optionally, the step of obtaining the speed correction value of the virtual main shaft according to the current actual position of the virtual main shaft and the constant Δx is implemented as:

[0014] Taking the remainder of the current actual position of the virtual main shaft with respect to the constant Δx to obtain the current remainder;

[0015] According to the current remainder, obtain the current position compensation value;

[0016] According to the current position compensation value, obtain the speed correction value of the virtual main shaft.

[0017] Optionally, the step of obtaining the current position compensation value according to the current remainder is implemented as:

[0018] Compare the current remainder with Δx / 2. If the current remainder is greater than Δx / 2, the position compensation value is equal to the difference obtained by subtracting the current remainder from Δx;

[0019] Otherwise, the position compensation value is equal to the negative of the current remainder.

[0020] Optionally, the light-emitting device includes a laser generator and a galvanometer scanner. The galvanometer scanner swings back and forth in a cyclic manner along the second direction; within each swing period of the galvanometer scanner, whenever the galvanometer scanner swings to a preset light-emitting position along the second direction, a pulse signal for instructing the laser generator to emit light is output; the step of obtaining the current actual position of the virtual main shaft whenever the light-emitting device turns on the laser is implemented as:

[0021] Whenever a pulse signal for indicating the emission of light from the laser generator is received, obtain the current actual position of the virtual spindle.

[0022] Optionally, the second method further includes the following steps:

[0023] When the first linear movement axis runs to the first preset position, output a first signal for allowing the light-emitting device to emit light, where the first preset position is between y1 - △y and y1;

[0024] When the first linear movement axis runs to the second preset position, output a second signal for prohibiting the light-emitting device from emitting light, where the second preset position is between y n +△y and y n ;

[0025] where y1 is used to represent the secondary axis coordinate of the first key point; y n is used to represent the secondary axis coordinate of the last key point, and △y is used to represent the center distance between every two adjacent grooves on the donor film without considering wrinkles.

[0026] Optionally, one piece of the donor film is used for N single-board transfers, N≥2; the control method further includes: before the Mth single-board printing based on one piece of the donor film, offset the secondary axis position of the electronic cam curve of the first linear movement axis for single-board transfer by W, where M≠1, and W is used to represent the center distance between the first groove for the Mth single-board transfer and the first groove for the first single-board transfer on the donor film.

[0027] In a second aspect, the present application provides a control device for laser transfer, and the control device includes an electronic cam module and a dynamic correction module, where the electronic cam module includes:

[0028] A first acquisition unit, which is used to acquire the position information of the reference grooves on the donor film; where, in the case of using one piece of the donor film to print one receptor substrate, the reference grooves include the first groove, the last groove, and the equally spaced grooves between the first groove and the last groove; in the case of using one piece of the donor film to print more than two receptor substrates, the reference grooves include the first groove for printing each receptor substrate, the last groove for printing the first receptor substrate, and the equally spaced grooves between the first groove and the last groove for printing the first receptor substrate;

[0029] The first determination unit is configured to obtain the position correspondence relationship between each reference groove for printing the first receptor substrate and the virtual main axis in the first direction according to the position information of the reference groove; wherein, the position difference between the virtual main axes corresponding to every two adjacent reference grooves for printing the first receptor substrate is the product of a constant △x and (n + 1), where n is used to represent the number of grooves spaced between two adjacent equal-spacing grooves;

[0030] The electronic cam unit is configured to use the position correspondence relationship between each reference groove for the first single-board transfer and the virtual main axis in the first direction as the coordinates of key points to obtain the electronic cam curve of the first linear movement axis for single-board transfer, and the first linear movement axis is used to drive the light-emitting device to move along the first direction; The dynamic correction module includes:

[0031] The second acquisition unit is configured to acquire the current actual position of the virtual main axis whenever the light-emitting device turns on the laser;

[0032] The correction unit is configured to obtain a speed correction value of the virtual main axis according to the current actual position of the virtual main axis and the constant △x, and the speed correction value of the virtual main axis is used to perform real-time correction on the reference speed of the virtual main axis.

[0033] In a third aspect, the present application provides an electronic device, including: a processor, a communication interface, a memory, and a bus, and the processor, the communication interface, and the memory complete communication with each other through the bus;

[0034] The memory is used to store at least one executable instruction, and the executable instruction causes the processor to execute the operations corresponding to the method described in any one of the first aspects.

[0035] In a fourth aspect, the present application provides a computer-readable storage medium, on which computer instructions are stored, and when the computer instructions are executed by a processor, the processor is caused to execute the method described in any one of the first aspects.

[0036] As can be seen from the above technical solutions, for the laser transfer control solutions provided in various aspects of the present application, the present application obtains the electronic cam curve according to the position information of the grooves on the donor film at the printing position, and the first linear movement axis moves along with the virtual main axis based on this electronic cam curve to drive the light-emitting device to move along the first direction, thereby realizing dynamic printing that simulates the wrinkles of the donor film. During the printing process, whenever the light-emitting device turns on the laser, the speed of the virtual main axis is adjusted according to the current actual position of the virtual main axis, so as to skillfully adjust the position of the virtual main axis, so that the virtual main axis runs △x within one swing period of the galvanometer, and the position fluctuation of the virtual main axis caused by the fluctuation of the swing period is controlled within ±1um. Brief Description of the Drawings

[0037] Figure 1 It is a flowchart of the first method of an exemplary embodiment of the present application.

[0038] Figure 2 It is a flowchart of the second method of an exemplary embodiment of the present application.

[0039] Figure 3 It is a schematic diagram of the shaft synchronization relationship of an exemplary embodiment of the present application.

[0040] Figure 4 It is a schematic diagram of the electronic cam curve of the first linear movement axis for single-board printing in an exemplary embodiment of the present application.

[0041] Figure 5 It is a control schematic diagram of the second method of an exemplary embodiment of the present application.

[0042] Figure 6 It is a schematic diagram of the control principle of the offset shaft in an exemplary embodiment of the present application.

[0043] Figure 7 It is a schematic diagram of the principle of laser transfer.

[0044] Figure 8 It is a schematic diagram of the output of the first signal and the second signal.

[0045] Figure 9 It is a schematic diagram of the slave axis offset principle before the Mth single-board printing based on one of the donor films.

[0046] List of Reference Numerals:

[0047] 11: Virtual main shaft;

[0048] 12: First linear movement axis;

[0049] 13: Second linear movement axis;

[0050] 14: Offset shaft;

[0051] 15: Measurement input module;

[0052] 21: Electronic cam;

[0053] 22: Electronic gear;

[0054] 23: Given offset value;

[0055] 24: Pulse signal for indicating the light output of the laser generator;

[0056] 25: Cam output module;

[0057] 26: First signal / Second signal;

[0058] 31: Synchronization section;

[0059] 32: Printing section;

[0060] 33: Deceleration and stop section;

[0061] 41: First signal;

[0062] 42: Second signal;

[0063] 43: Pulse signal corresponding to the first key point on the electronic cam curve for single-board printing;

[0064] 44: Pulse signal corresponding to the last key point on the electronic cam curve for single-board printing;

[0065] 51: Current actual position of the virtual main shaft obtained when detecting the pulse signal for indicating the light emission of the laser generator 811;

[0066] 52: The remainder obtained by taking the modulus of the current actual position of the virtual main shaft with the constant △x;

[0067] 53: Current remainder;

[0068] 54: Is the current remainder > 500?

[0069] 55: Feedback = △x - current remainder;

[0070] 56: Feedback = - current remainder;

[0071] 57: 0um;

[0072] 58: PID;

[0073] 59: Reference speed of the virtual main shaft;

[0074] 60: Set speed of the virtual main shaft;

[0075] 701: Second direction;

[0076] 702: First direction;

[0077] 703: Offset angle of the offset motor;

[0078] 704: Preset light emission position;

[0079] 705: Preset light-off position;

[0080] 811: Laser generator;

[0081] 812: Galvo scanner;

[0082] 82: Donor film;

[0083] 821: Groove;

[0084] 83: Receptor substrate;

[0085] 831: Gate line;

[0086] 84: The first linear motor shaft drives the light-emitting device to move in the first direction;

[0087] 85: The offset motor drives the first linear motor shaft and the light-emitting device to offset;

[0088] 86: The second linear motor shaft drives the receptor substrate to move in the first direction; Detailed implementation manners

[0089] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art shall fall within the protection scope of the embodiments of the present application.

[0090] The following will describe in detail some embodiments of the present application with reference to the accompanying drawings. Without conflict between the embodiments, the following embodiments and the features in the embodiments can be combined with each other. The steps in the following method embodiments are only for exemplary description and are not used to limit the present invention.

[0091] Laser transfer printing is to fill the groove in the donor film with paste. Applying the principle of laser irradiation, the contact surface between the paste and the donor film is heated and evaporated first to generate vapor pressure, so that the paste and the donor film are separated and fall onto the surface of the photovoltaic cell to form gate lines. Laser transfer printing can effectively reduce the paste usage amount, and the printed line width is narrower, thereby improving the photoelectric conversion efficiency. However, laser transfer printing has very high requirements for the servo motion control accuracy, and it is necessary to ensure the high precision and high stability of the light-emitting device during the movement process to achieve the precise printing of the gate lines. However, the traditional control methods are difficult to meet the requirements of laser transfer printing for printing accuracy, thus restricting the application of laser transfer printing technology.

[0092] In view of this, the present application provides a control solution for laser transfer printing. By obtaining the actual position information of the groove on the donor film at the printing position, the electronic cam trajectory is dynamically corrected, greatly improving the printing accuracy of laser transfer printing.

[0093] The following will describe in detail the specific implementation of each embodiment of the present application with reference to the accompanying drawings.

[0094] Control Method for Laser Transfer

[0095] The control method for laser transfer provided in this embodiment includes:

[0096] After the donor film reaches the printing position, the first method 100 is executed, as Figure 1 The first method 100 shown includes:

[0097] S101: Obtain the position information of the reference grooves on the donor film; wherein, when one donor film is used to print one receptor substrate, the reference grooves include the first groove, the last groove, and equally spaced grooves located between the first groove and the last groove; when one donor film is used to print two or more receptor substrates, the reference grooves include the first groove for printing each receptor substrate, the last groove for printing the first receptor substrate, and equally spaced grooves located between the first groove and the last groove for printing the first receptor substrate.

[0098] On the surface of the donor film 82, an array of micron-level precision grooves 821 for filling the paste is etched, and these grooves 821 are arranged at equal intervals. Without considering the wrinkles of the donor film 82, the center distance between every two adjacent grooves 821 on the donor film 82 is equal, which is equal to △y. After the filling is completed, the donor film 82 is transferred to the printing position. Due to the elastic deformation of the donor film 82 caused by the tension fluctuation during the unwinding - doctor blade filling - rewinding process, wrinkles are generated on the donor film 82 at the printing position, and the grooves 821 deviate from their initial positions. If printing is directly performed according to the initial positions of the grooves 821, the laser output by the light-emitting device cannot be aligned with the grooves 821.

[0099] In this embodiment, by obtaining the position information of the grooves on the donor film at the printing position, the actual positions of the grooves during laser transfer can be accurately obtained, so that the scanning path of the laser can be aligned with the grooves during the transfer process, improving the printing accuracy.

[0100] It can be understood that when the number of grooves spaced between the equally spaced grooves is 0, the position information of all the grooves on the donor film is obtained.

[0101] In some embodiments, the interval of the equally spaced grooves is greater than 0. For example, when the interval is 2 grooves, the 1st groove, the 4th groove, the 7th groove... are the reference grooves.

[0102] To improve production efficiency, a single donor film is used to print multiple receptor substrates. For example, if 180 grid lines need to be printed on each receptor substrate and a single donor film is used to print six receptor substrates, then there are 1080 grooves on a single donor film, and the spacing between the grooves is small, at the micron level. By reasonably setting the intervals, both the data processing volume is reduced and the deformation of the donor film at the printing position can be reflected.

[0103] In some embodiments, the interval between equally spaced grooves is less than or equal to 5.

[0104] In some embodiments, S101 is implemented as: based on the photographing result of the donor film by a vision camera, the position information of the grooves on the donor film is obtained.

[0105] The donor film at the printing position is photographed using a vision camera, so that the accurate position information of the grooves can be obtained.

[0106] S103: According to the position information of the reference grooves, obtain the position correspondence relationship between each reference groove for printing the first receptor substrate and the virtual main axis in the first direction 702; wherein, the position difference between the virtual main axes corresponding to every two adjacent reference grooves for printing the first receptor substrate is the product of the constant △x and (n + 1), that is, △x * n + 1, where n is used to represent the number of grooves spaced between every two adjacent equally spaced grooves. The first direction 702 is perpendicular to the extension direction of the grooves when the donor film is at the printing position and the donor film is not considered to have wrinkles.

[0107] As described above, in the case where a single donor film can print multiple receptor substrates as described above, the reference grooves for printing the first receptor substrate include the first groove for printing the first receptor substrate, the last groove for printing the first receptor substrate, and the equally spaced grooves located between the first groove and the last groove for printing the first receptor substrate.

[0108] According to the position information of the grooves obtained in step S101, the position correspondence relationship (x i , y i ) between each reference groove for printing the first receptor substrate and the virtual main axis in the first direction can be obtained, where y i is the position value of the i-th reference groove for printing the first receptor substrate relative to the reference position in the first direction, and x i is the position of the virtual main axis corresponding to y i .

[0109] In some embodiments, △x is an integer multiple of 100. Exemplarily, when △x is 1000um and the interval n is 2, the position difference of the virtual main axis corresponding to every two adjacent reference grooves for printing the first receptor substrate is equal to 1000*(2 + 1), that is, 3000um.

[0110] S105: Use the position correspondence relationship between each reference groove for the first single-board transfer and the virtual main axis in the first direction 702 as the coordinates of the key points, and obtain the electronic cam curve of the first linear moving axis for single-board transfer. The first linear moving axis is used to drive the light-emitting device to move along the first direction 702.

[0111] Interpolate using the position correspondence relationship between each reference groove for the first single-board transfer and the virtual main axis in the first direction as the coordinates of the key points to obtain the electronic cam curve of the first linear moving axis for single-board transfer. Therefore, the coordinates of these key points are included on this electronic cam curve, as Figure 4 shown. And the ordinate y1 of the first key point P1 on the electronic cam curve is the position value of the first groove for printing the first receptor substrate, and the ordinate y n of the last key point Pn on the electronic cam curve is the position value of the last groove for printing the first receptor substrate.

[0112] In this application, the electronic cam curve is obtained according to the position information of the grooves on the donor film at the printing position. The first linear moving axis moves following the virtual main axis based on this electronic cam curve to drive the light-emitting device to move in the first direction, thereby realizing the dynamic printing of simulating the wrinkles of the donor film.

[0113] In some embodiments, the electronic cam curve of the first linear moving axis for single-board transfer sequentially includes a synchronization section 31, a transfer section 32, and a deceleration stop section 33. The transfer section is between the first key point P1 and the last key point Pn, as Figure 4 shown. The difference between the starting point P0 of the electronic cam curve and the abscissa of the first key point is equal to k*△x, where k ranges from 5 to 20.

[0114] After the electronic cam is started, the first linear moving axis starts to accelerate from rest. When it moves to the starting point P0 of the electronic cam curve, the positions of the first linear moving axis and the virtual reference axis are synchronized (i.e., the position of the first linear moving axis is the same as the ordinate of the starting point P0, and the position of the virtual main axis is the same as the abscissa of the starting point P0). At this time, the first linear moving axis enters a state of substantially uniform motion. Since the first linear moving axis has just entered the state of substantially uniform motion at this time, its following error is still unstable. If the printing grid line is performed at this time, a large printing deviation will be formed. To solve this problem, in this embodiment, by reasonably setting the difference between the abscissas of the starting point P0 and the first key point P1 of the electronic cam curve, the first linear moving axis enters a state of relatively stable following error before reaching the first key point P1, thereby avoiding the printing deviation caused by the fluctuation of the following error of the slave axis.

[0115] During the transfer process, the second method S200 is executed, as Figure 2 shown, the second method S200 includes:

[0116] S201: Whenever the light-emitting device turns on the laser, obtain the current actual position of the virtual main axis.

[0117] As Figure 7 shown, the light-emitting device includes a laser generator 811 and a galvanometer 812. The laser generator 811 is used to emit laser light, and the galvanometer 812 is used to control the trajectory of the laser light. The galvanometer 812 swings back and forth in a cyclic manner along the second direction 701, where the second direction 701 is perpendicular to the first direction 702. When the galvanometer 812 swings to the preset light-emitting position 704 along the second direction 702, the laser generator 811 starts to emit laser light. The galvanometer 812 continues to swing along the second direction 701, so that the laser light moves along the groove on the donor film. When the galvanometer 812 swings to the preset light-off position 705 along the second direction 701, the laser generator 811 stops emitting laser light. The total time required for the galvanometer 812 to complete one reciprocating motion is the swing period of the galvanometer 812. During one swing period of the galvanometer 812, only when the galvanometer 812 swings from the preset light-emitting position 704 to the preset light-off position 705 along the second direction 701, a laser trajectory will be formed on the donor film and a grid line will be printed on the receptor substrate.

[0118] In some embodiments, during each swing period of the galvanometer 812, whenever the galvanometer 812 swings to the preset light-emitting position 704 along the second direction 701, a pulse signal for indicating that the laser generator 811 emits light is output; whenever the galvanometer 812 swings to the preset light-off position 705 along the second direction 701, a signal for indicating that the laser generator 811 stops emitting light is output. In this embodiment, step S201 is implemented as:

[0119] Whenever a pulse signal for indicating the light emission of the laser generator 811 is received, obtain the current actual position of the virtual spindle.

[0120] Exemplarily, the pulse signal for indicating the light emission of the laser generator 811 can be obtained based on the measurement input function of the electronic cam, such as Figure 3 and Figure 5 shown, but not limited thereto.

[0121] S203: Obtain the speed correction value of the virtual spindle according to the current actual position of the virtual spindle and the constant △x, and the speed correction value of the virtual spindle is used to perform real-time correction on the reference speed of the virtual spindle.

[0122] In this embodiment, the reference speed of the virtual spindle is equal to △x / △t, where △t is the reference period of the swing of the galvanometer 812.

[0123] The galvanometer 812 swings back and forth once, that is, within one swing period of the galvanometer 812, a grid line 831 is printed. Therefore, whenever the laser generator 811 starts to emit laser light, the first linear movement axis should drive the laser generator 811 to align with the groove in the first direction 702. The time interval when the laser generator 811 starts to emit laser light is related to the swing period of the galvanometer 812. However, there will be certain fluctuations in the swing period of the galvanometer 812. For example, the reference swing period is 3.3 ms, and the period fluctuation is usually ±2 us. Taking the reference period of 3.3 ms, the pulse period fluctuation of ±1 us, and △x = 1000 um as an example, the deviation of the virtual spindle within the reference period of 3.3 ms is (1000 um / 3.3 ms) * 0.002 ms = 0.6 um, and this deviation will continue to accumulate, resulting in the scanning beam being unable to align with the groove. To solve this problem, in this embodiment, whenever the galvanometer 812 swings to the preset light emission position 704, the speed of the virtual spindle is adjusted according to the current actual position of the virtual spindle, so as to cleverly adjust the position of the virtual spindle, so that the virtual spindle runs △x within one swing period of the galvanometer 812, so that the position fluctuation of the virtual spindle caused by the fluctuation of the swing period is controlled within ±1 um.

[0124] In some embodiments, step S203 further includes:

[0125] S2031: Take the remainder of the current actual position of the virtual spindle with respect to the constant △x to obtain the current remainder.

[0126] S2032: Obtain the current position compensation value according to the current remainder.

[0127] In some embodiments, step S2032 is further implemented as:

[0128] The current remainder is compared with △x / 2. If the current remainder is greater than △x / 2, the position compensation value is equal to the difference between △x and the current remainder; otherwise, the position compensation value is equal to the negative current remainder, such as Figure 5 shown.

[0129] S2033: Obtaining a speed correction value of the virtual spindle according to the current position compensation value.

[0130] In some implementations, according to the current position compensation value, a speed correction value of the virtual spindle is obtained based on a PI control algorithm. The PI control algorithm combines two control modes: proportional control (Proportional, P) and integral control (Intergal, I).

[0131] In this embodiment, the set speed of the virtual spindle is equal to the difference between the base speed of the virtual spindle and the speed correction value of the virtual spindle. Figure 5 shown.

[0132] In some implementations, the second method S200 further includes the following steps:

[0133] S205: When the first linear movable axis moves to a first preset position, a first signal for allowing the light emitting device to emit light is output, wherein the first preset position is between y1-Δy and y1.

[0134] S207: When the first linear movable axis moves to the second preset position, a second signal for prohibiting the light emitting device from emitting light is output, wherein the second preset position is between y n +△y and y n between.

[0135] Wherein y1 in step S205 and step S207 is used to represent the slave axis coordinate of the first key point; n It is used to characterize the slave axis coordinate of the last key point, and △y is used to characterize the center distance between each two adjacent grooves on the donor film when wrinkles are not considered.

[0136] It can be understood that the laser generator can emit laser light only when the light emitting device receives the first signal allowing light emission and receives a pulse signal output by the galvanometer instructing the laser generator to emit light.

[0137] During the single-board printing process, a light signal needs to be given during the swing cycle of the galvanometer before printing the first grid line; the light signal needs to be canceled during the swing cycle of the galvanometer after printing the last grid line, otherwise it will cause the grid lines to be printed too much or too little. Figure 8As shown. To solve this problem, in this embodiment, by obtaining the current position of the first linear moving axis in real time, when the first linear moving axis runs to the first preset position, a first signal 41 for indicating the laser generator to emit light is output, and when the first linear moving axis runs to the second preset position, a second signal 42 for canceling the laser generator from emitting light is output, so that the timing of light emission and the end of light emission can be accurately controlled, avoiding overprinting and underprinting of the grid lines.

[0138] As described above, to improve production efficiency, one piece of the donor film can be used for multiple single-board transfers, while the electronic cam curve obtained by method S100 is only used for single-board printing. Therefore, in order to make this electronic cam curve applicable to all receptor substrates based on one piece of the donor film, the method of this application further includes step S300: before the Mth single-board printing based on one piece of the donor film, M≠1, the slave axis position of the electronic cam curve of the first linear moving axis for single-board transfer is offset as a whole by W, where W is used to represent the center distance between the first groove for the Mth single-board transfer and the first groove for the first single-board transfer on the donor film. Exemplarily, in Figure 9 the shown donor film can be used for four single-board transfers. For ease of understanding, the solid line represents the groove for printing the first receptor substrate, the dotted line represents the groove for printing the second receptor substrate, the dashed line represents the groove for printing the third receptor substrate, and the double-dotted line represents the groove for printing the fourth receptor substrate. Before the second single-board printing, the slave axis position of the electronic cam curve of the first linear moving axis for single-board transfer is offset as a whole by W1, where W1 is the center distance between the first groove for the second single-board transfer and the first groove for the first single-board transfer; before the third single-board printing, the slave axis position of the electronic cam curve of the first linear moving axis for single-board transfer is offset as a whole by W2, where W2 is the center distance between the first groove for the third single-board transfer and the first groove for the first single-board transfer; before the fourth single-board printing, the slave axis position of the electronic cam curve of the first linear moving axis for single-board transfer is offset as a whole by W3, where W3 is the center distance between the first groove for the fourth single-board transfer and the first groove for the first single-board transfer.

[0139] Through the offset of the slave axis position, all single-board printings can be completed based on the same electronic cam curve.

[0140] The first linear moving axis moves following a virtual reference axis based on the electronic cam curve of method S100. When the light-emitting device emits light, only when the first linear moving axis is at the set position on the electronic cam curve can the laser be ensured to be aligned with the currently printed groove, otherwise printing deviation will occur. However, affected by factors such as axis response delay, when a pulse arrives, the set position of the first linear moving axis cannot be equal to its actual position, and there is a following deviation between the two. For example, when detecting the pulse signal indicating the light emission of the laser generator, the set position of the first linear moving axis based on the electronic cam curve is 20074um, but at this time the actual position of the first linear moving axis is 19140um, with a delay of 1034um. The following deviation affects the printing accuracy of the grid lines. To solve this problem, a third method is further included based on an embodiment of the present application. The third method includes:

[0141] S301: Print the aluminum donor film based on the calibration cam.

[0142] The aluminum donor film is not easily deformed, so it will not produce wrinkles at the printing position, and the actual position of the groove of the aluminum donor film at the printing position is equal to its original position. Using a laser to irradiate the aluminum donor film can form a red scanning line on the aluminum donor film.

[0143] The calibration cam is completely consistent with the starting coordinate, the number of key points, and the abscissa of the key points of the electronic cam curve for single-board printing in method 100. The only difference is that the ordinate of the key point is the original position of the groove without considering the deformation of the donor film. For easy understanding, reference can be made to Table 1 and Table 2, where Table 1 is the starting coordinate and key point coordinates of the electronic cam curve for single-board printing, and Table 2 is the starting coordinate and key point coordinates of the calibration cam corresponding to the electronic cam curve. The electronic curve includes 60 key points, corresponding to 60 reference grooves on the donor film, where the number of grooves between every two adjacent reference grooves is 2, △y is used to represent the center distance between every two adjacent grooves on the donor film without considering wrinkles, and f is used to represent the position deviation between the reference groove of the donor film at the printing position and its original position.

[0144]

[0145]

[0146] Table 1

[0147] Main Axis Coordinates Slave Axis Coordinates Starting Point (P0) <![CDATA[X1-11△x]]> Y - 11△y First Key Point (P1) <![CDATA[X1]]> <![CDATA[Y1]]> Second Key Point <![CDATA[X1 + 3△x]]> <![CDATA[Y1 + 3△y]]> Third Key Point <![CDATA[X1+6△x]]> <![CDATA[Y1+6△y]]> Fourth Key Point <![CDATA[X1+9△x]]> <![CDATA[Y1+9△y]]> Fifth Key Point <![CDATA[X1 + 12△x]]> <![CDATA[Y1 + 12△y]]> Sixth Key Point <![CDATA[X1+15△x]]> <![CDATA[Y1+15△y]]> Seventh Key Point <![CDATA[X1 + 18△x]]> <![CDATA[Y1 + 18△y]]> …… Sixtieth Key Point (Pn) <![CDATA[X1+177△x]]> <![CDATA[Y1+177△y]]>

[0148] Table 2

[0149] S303: During the printing process, whenever the light-emitting device turns on the laser, obtain the current actual positions of the first linear moving axis and the virtual main axis.

[0150] For example, the current actual positions of the first linear moving axis and the virtual main axis can be obtained based on the measurement input function of the electronic cam, but it is not limited thereto.

[0151] S305: Obtain a speed correction value for the virtual main axis according to the current actual position of the virtual main axis and the constant △x, and the speed correction value of the virtual main axis is used to perform real-time correction on the reference speed of the virtual main axis.

[0152] S307: Obtain the actual position of the first scanning line of the aluminum donor film, and obtain the following deviation of the first linear moving axis according to the deviation between the actual position and the ordinate of the first key point of the calibration cam.

[0153] Exemplarily, this following deviation can be compensated by means of overall offset of the slave axis of the electronic cam for single-board printing, but it is not limited thereto.

[0154] It can be understood that when the following deviation of the first linear moving axis may change, the third method is executed. The situations where the following deviation of the first linear moving axis may change include but are not limited to: any mechanical change, the grid line deviation on the receptor substrate exceeding the threshold, etc.

[0155] It can be understood that in order to ensure the accuracy of the position acquisition result based on the vision camera, it is also necessary to calibrate the vision camera with the first linear moving axis.

[0156] Exemplarily, the calibration steps include: performing multiple prints on the aluminum donor film based on the calibration cam; after each print is completed, the vision camera takes a picture of the aluminum donor film to obtain the position information of the scanning line on the aluminum donor film; calibrate the vision camera according to the position information of the scanning line on the aluminum donor film obtained multiple times and the ordinate of the key point on the calibration cam, so that the position information of the scanning line on the aluminum donor film is consistent with the ordinate of the key point on the calibration cam. But it is not limited thereto.

[0157] In some embodiments, the pitch of the grid lines 831 on the receptor substrate 83 may not be equal to the pitch between two adjacent grooves 821 on the donor film 82 for single-board printing. To solve this problem, the second linear moving axis is set to be electronically geared in synchronization with the first linear moving axis, as Figure 3As shown in the figure. The second linear moving axis is used to drive the receptor substrate 83 to move along the first direction 702. According to the actual distance between two adjacent grooves 821 for single-board printing on the donor film 82 (obtained according to step S101) and the target distance of the gate lines 831, the electronic gear ratio of the second linear moving axis is obtained. Thus, by moving the receptor substrate 83, gate lines with different distances can be printed using the same donor film.

[0158] During the printing process, the scanning direction of the laser beam controlled by the galvanometer is parallel to the extension direction of the gate lines, and the first linear moving axis drives the light-emitting device to move in a direction perpendicular to the gate lines. Therefore, under the action of the above two perpendicular movements, the printed gate lines are oblique lines, as Figure 6 shown. To solve this problem, during the printing process (including calibration), the offset motor drives the light-emitting device and the first linear moving axis to offset a certain angle based on a given offset value, so as to print vertical gate lines, as Figure 3 shown.

[0159] Control Device for Laser Transfer

[0160] The control device for laser transfer provided in this embodiment includes an electronic cam module and a dynamic correction module, where the electronic cam module includes:

[0161] A first acquisition unit, which is used to acquire the position information of the reference grooves on the donor film; among them, when a piece of donor film is used to print one receptor substrate, the reference grooves include the first groove, the last groove, and the equally spaced grooves located between the first groove and the last groove; when a piece of donor film is used to print more than two receptor substrates, the reference grooves include the first groove for printing each receptor substrate, the last groove for printing the first receptor substrate, and the equally spaced grooves located between the first groove and the last groove for printing the first receptor substrate.

[0162] A first determination unit, which is used to obtain the position correspondence relationship between each reference groove for printing the first receptor substrate and the virtual main axis in the first direction according to the position information of the reference grooves; among them, the position difference of the virtual main axis corresponding to every two adjacent reference grooves for printing the first receptor substrate is the product of the constant △x and (n + 1), where n is used to represent the number of grooves spaced between every two adjacent equally spaced grooves.

[0163] An electronic cam unit, which is used to use the position correspondence relationship between each reference groove for the first single-board transfer and the virtual main axis in the first direction as the coordinates of key points, and obtain the electronic cam curve of the first linear moving axis for single-board transfer, where the first linear moving axis is used to drive the light-emitting device to move along the first direction.

[0164] The dynamic correction module includes:

[0165] A second acquisition unit that acquires the current actual position of the virtual main shaft whenever the light-emitting device turns on the laser;

[0166] A correction unit that, based on the current actual position of the virtual main shaft and the constant △x, obtains a speed correction value for the virtual main shaft, and the speed correction value of the virtual main shaft is used to perform real-time correction on the reference speed of the virtual main shaft. It should be noted that the information interaction, execution process, etc. among the units in the above laser transfer control device, due to being based on the same concept as the foregoing embodiments of the laser transfer control method, the specific content can be referred to the description in the foregoing embodiments of the laser transfer control method, and will not be elaborated here.

[0167] Electronic Device

[0168] The specific embodiments of the present application do not limit the specific implementation of the electronic device. The electronic device provided by the embodiments of the present application includes: a processor, a communication interface, a memory, and a bus. Among them:

[0169] The processor, the communication interface, and the memory complete communication with each other through the bus.

[0170] The communication interface is used to communicate with other electronic devices or servers.

[0171] The processor is used to execute a program, specifically, it can execute the relevant steps in the foregoing embodiments of the laser transfer control method.

[0172] Specifically, the program may include program code, and the program code includes computer operation instructions.

[0173] The processor may be a central processing unit CPU, or a specific integrated circuit ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement the embodiments of the present application. One or more processors included in the intelligent device may be of the same type of processor, such as one or more CPUs; or they may be of different types of processors, such as one or more CPUs and one or more ASICs.

[0174] The memory is used to store the program. The memory may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk memory.

[0175] The program can specifically be used to cause a processor to execute the laser transfer control method in any of the foregoing embodiments.

[0176] For the specific implementation of each step in the program, reference may be made to the corresponding steps and descriptions in the corresponding units in the foregoing embodiments of the laser transfer control method, which will not be elaborated herein. Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the devices and modules described above may refer to the corresponding process descriptions in the foregoing method embodiments, which will not be repeated herein.

[0177] Computer - Readable Storage Medium

[0178] The present application also provides a computer-readable storage medium storing instructions for causing a machine to execute the laser transfer control method as described herein. Specifically, a system or device equipped with the storage medium may be provided, on which software program code for implementing the functions of any one of the foregoing embodiments is stored, and the computer (or CPU or MPU) of the system or device is caused to read and execute the program code stored in the storage medium.

[0179] In this case, the program code read from the storage medium itself can implement the functions of any one of the foregoing embodiments, so the program code and the storage medium storing the program code constitute a part of the present application.

[0180] Examples of storage media for providing program code include floppy disks, hard disks, magneto-optical disks, optical disks (such as CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD+RW), magnetic tapes, non-volatile memory cards, and ROMs. Optionally, the program code may be downloaded from a server computer via a communication network.

[0181] Computer Program Product

[0182] The embodiments of the present application also provide a computer program product, including computer instructions, which instruct a computing device to execute any corresponding operation in the foregoing multiple method embodiments.

[0183] It should be noted that according to the needs of implementation, the various components / steps described in the embodiments of the present application may be split into more components / steps, or two or more components / steps or partial operations of components / steps may be combined into new components / steps to achieve the objectives of the embodiments of the present application.

[0184] The method according to the embodiments of the present application can be implemented in hardware, firmware, or be implemented as software or computer code that can be stored in a recording medium (such as a CD ROM, RAM, floppy disk, hard disk, or magneto-optical disk), or be implemented as computer code originally stored in a remote recording medium or a non-transitory machine-readable medium and to be downloaded through a network and stored in a local recording medium, so that the method described herein can be stored in such software processing on a recording medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware (such as an ASIC or an FPGA). It can be understood that a computer, a processor, a microprocessor controller, or programmable hardware includes a storage component (such as a RAM, a ROM, a flash memory, etc.) that can store or receive software or computer code, and when the software or computer code is accessed and executed by the computer, the processor, or the hardware, the method described herein is implemented. In addition, when a general-purpose computer accesses the code for implementing the method shown herein, the execution of the code converts the general-purpose computer into a dedicated computer for executing the method shown herein.

[0185] It should be noted that not all steps and modules in the above-mentioned various processes and system structure diagrams are necessary, and some steps or modules can be ignored according to actual needs. The execution order of each step is not fixed and can be adjusted according to needs. The system structures described in the above-mentioned various embodiments can be physical structures or logical structures, that is, some modules may be implemented by the same physical entity, or some modules may be implemented separately by multiple physical entities, or some components in multiple independent devices may be jointly implemented.

[0186] In this patent application, nouns and pronouns related to people are not limited to specific genders.

[0187] In the above-mentioned various embodiments, the hardware modules can be implemented mechanically or electrically. For example, a hardware module can include permanent dedicated circuits or logic (such as a dedicated processor, an FPGA, or an ASIC) to complete corresponding operations. The hardware module can also include programmable logic or circuits (such as a general-purpose processor or other programmable processors), which can be temporarily set by software to complete corresponding operations. The specific implementation method (mechanical method, or dedicated permanent circuit, or temporarily set circuit) can be determined based on cost and time considerations.

[0188] The present invention has been described in detail above through the drawings and preferred embodiments. However, the present invention is not limited to these disclosed embodiments. Based on the above-mentioned multiple embodiments, those skilled in the art can know that more embodiments of the present invention can be obtained by combining the code review means in the above different embodiments, and these embodiments are also within the protection scope of the present invention.

Claims

1. A laser transfer control method, characterized in that: The control method comprises: When the donor film reaches the printing position, a first method is performed, wherein the first method comprises: Acquire position information of reference grooves on the donor film; wherein, when a piece of donor film is used to print one acceptor substrate, the reference grooves include a first groove, a last groove, and an equally spaced groove between the first groove and the last groove; when a piece of donor film is used to print more than two acceptor substrates, the reference grooves include a first groove for printing each acceptor substrate, a last groove for printing the first acceptor substrate, and an equally spaced groove between the first groove and the last groove for printing the first acceptor substrate; According to the position information of the reference grooves, a position correspondence between each reference groove for printing the first receptor substrate and the virtual main axis in the first direction is obtained; wherein the position difference of the virtual main axis corresponding to each two adjacent reference grooves for printing the first receptor substrate is the product of a constant △x and (n+1), wherein n is used to represent the number of grooves spaced between two adjacent equally spaced grooves; Using the position correspondence between each reference groove for the first single board transfer and the virtual main axis in the first direction as the coordinates of the key point, an electronic cam curve of a first linear moving axis for single board transfer is obtained, wherein the first linear moving axis is used to drive the light emitting device to move along the first direction; During the transfer process, a second method is performed, wherein the second method comprises: Whenever the laser is turned on by the light emitting device, the current actual position of the virtual spindle is obtained; According to the current actual position of the virtual spindle and the constant Δx, a speed correction value of the virtual spindle is obtained, and the speed correction value of the virtual spindle is used to perform real-time correction on the reference speed of the virtual spindle.

2. The laser transfer control method according to claim 1, characterized in that: The electronic cam curve of the first linear movable axis for single-board transfer includes a synchronization section, a transfer section and a deceleration and stop section in sequence, wherein the transfer section is between the first key point and the last key point, wherein the difference between the starting point of the electronic cam curve and the horizontal coordinate of the first key point is equal to k*△x, and k is between 5 and 20.

3. The laser transfer control method according to claim 1 or 2, characterized in that: According to the current actual position of the virtual spindle and the constant Δx, the step of obtaining the speed correction value of the virtual spindle is implemented as follows: The current actual position of the virtual spindle is modulo the constant △x to obtain a current remainder; According to the current remainder, a current position compensation value is obtained; A speed correction value of the virtual spindle is obtained according to the current position compensation value.

4. The laser transfer control method according to claim 3, characterized in that: According to the current remainder, the step of obtaining the current position compensation value is implemented as follows: Compare the current remainder with △x / 2, if the current remainder is greater than △x / 2, the position compensation value is equal to the difference obtained by subtracting the current remainder from △x; Otherwise, the position compensation value is equal to the negative current remainder.

5. The laser transfer control method according to claim 4, characterized in that: The light emitting device includes a laser generator and a galvanometer, and the galvanometer swings back and forth in a second direction, and the second direction is perpendicular to the first direction; in each swing cycle of the galvanometer, each time the galvanometer swings to a preset light emitting position along the second direction, a pulse signal for instructing the laser generator to emit light is output; each time the light emitting device turns on the laser, the step of obtaining the current actual position of the virtual spindle is implemented as follows: Whenever a pulse signal for instructing the laser generator to emit light is received, the current actual position of the virtual spindle is obtained.

6. The laser transfer control method according to claim 5, characterized in that: The second method further comprises the following steps: When the first linear movable axis moves to a first preset position, a first signal for allowing the light emitting device to emit light is output, wherein the first preset position is between y1-△y and y1; When the first linear moving axis moves to the second preset position, a second signal for prohibiting the light emitting device from emitting light is output, wherein the second preset position is between y n +△y and y n between; Where y1 is used to represent the slave axis coordinate of the first key point; n It is used to characterize the slave axis coordinate of the last key point, and △y is used to characterize the center distance between each two adjacent grooves on the donor film when wrinkles are not considered.

7. The laser transfer control method according to claim 1, characterized in that: One piece of the donor film is used for N single-board transfer, N≥2; the control method further includes: Before performing the Mth single board printing based on a piece of the donor film, the slave axis position of the electronic cam curve of the first linear moving axis for single board transfer is offset by W, where M≠1, and W is used to characterize the center distance between the first groove for the Mth single board transfer and the first groove for the 1st single board transfer on the donor film.

8. A laser transfer control device, characterized in that: The control device comprises an electronic cam module and a dynamic correction module, wherein the electronic cam module comprises: A first acquisition unit, which is used to acquire position information of reference grooves on the donor film; wherein, in the case where a piece of donor film is used to print one acceptor substrate, the reference grooves include a first groove, a last groove, and an equally spaced groove between the first groove and the last groove; in the case where a piece of donor film is used to print more than two acceptor substrates, the reference grooves include a first groove for printing each acceptor substrate, a last groove for printing the first acceptor substrate, and an equally spaced groove between the first groove and the last groove for printing the first acceptor substrate; A first determining unit is used to obtain a position correspondence between each reference groove used for printing the first receptor substrate and the virtual main axis in the first direction based on the position information of the reference groove; wherein the position difference of the virtual main axis corresponding to each two adjacent reference grooves used for printing the first receptor substrate is the product of a constant △x and (n+1), wherein n is used to represent the number of grooves spaced between two adjacent equally spaced grooves; an electronic cam unit, which is used to obtain an electronic cam curve of a first linear moving axis for single-board transfer by taking the position correspondence between each reference groove for the first single-board transfer and the virtual main axis in the first direction as the coordinates of the key point, wherein the first linear moving axis is used to drive the light emitting device to move along the first direction; The dynamic correction module includes: A second acquisition unit, which acquires the current actual position of the virtual spindle whenever the light emitting device turns on the laser; The correction unit is used to obtain a speed correction value of the virtual spindle according to the current actual position of the virtual spindle and the constant △x, and the speed correction value of the virtual spindle is used to correct the reference speed of the virtual spindle in real time.

9. An electronic device, comprising: A processor, a communication interface, a memory and a bus, wherein the processor, the communication interface and the memory communicate with each other via the bus; The memory is used to store at least one executable instruction, and the executable instruction enables the processor to perform an operation corresponding to the method as claimed in any one of claims 1 to 7. 10 . A computer-readable storage medium having computer instructions stored thereon, wherein when the computer instructions are executed by a processor, the processor is caused to execute the method according to claim 1 .

Images