CN109935741B - Inkjet printing alignment method and device for OLED display panel - Google Patents
Inkjet printing alignment method and device for OLED display panel Download PDFInfo
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- CN109935741B CN109935741B CN201910260405.1A CN201910260405A CN109935741B CN 109935741 B CN109935741 B CN 109935741B CN 201910260405 A CN201910260405 A CN 201910260405A CN 109935741 B CN109935741 B CN 109935741B
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Abstract
The invention relates to the technical field of display, and discloses an inkjet printing alignment method and device for an OLED display panel. The OLED display panel ink-jet printing alignment method comprises the steps that a glass substrate is placed on a glass substrate transmission table, alignment is carried out through alignment marks, and before next position ink-jet printing operation is carried out, image information of the glass substrate is collected; comparing and analyzing the image information with preset information, and calculating the offset of the printing position; and correcting the printing position of the nozzle according to the offset of the printing position. In the method, before each next position ink-jet printing operation, the alignment state of the glass substrate and the spray head is monitored through the alignment system, and the printing position of the spray head is corrected according to the offset of the printing position, so that the alignment printing precision of ink drops sprayed by the spray head and pattern electrodes on the glass substrate during next position ink-jet printing is improved, and poor uniformity caused by misalignment is avoided.
Description
Technical Field
The invention relates to the technical field of display, in particular to an inkjet printing alignment method and device for an OLED display panel.
Background
In the production of an Organic Light-Emitting Diode (OLED) display screen, an inkjet printing process or an evaporation process can be selected to realize the preparation of a Light-Emitting material. Compared with the evaporation technology, the ink-jet printing technology has the advantages of high material utilization rate, low investment cost, simple process flow, high production efficiency and the like. In the traditional OLED luminescent material printing process, only one-time alignment is carried out in the whole glass substrate printing process, namely, before printing is started, identification alignment is carried out, and after the alignment is finished, the whole glass substrate is printed.
However, in the printing process of the OLED light-emitting material, the glass substrate moves in an air floating manner, a large error exists in the stability of the substrate, inertia exists in the moving process of the substrate, alignment deviation is not easy to control, and an error exists in the alignment precision of the printing device, which causes deviation of the landing position and the preset track of the light-emitting material in printing, the quality of a printing device cannot be guaranteed, and color cross-color defects, Mura (phenomenon of color difference in different degrees is visually sensed under the same light source and the same ground color) and other related display defects are caused, so that the yield of the inkjet printing OLED is low, and mass production cannot be achieved.
The high-resolution OLED display screen has higher requirements on the printing accuracy of the light-emitting material, and therefore, how to control the printing offset and ensure the uniformity is very critical to ensure the yield of the inkjet printing.
Disclosure of Invention
The invention provides an OLED display panel ink-jet printing alignment method and device, wherein the OLED display panel ink-jet printing alignment method adopts an image tracking technology, realizes a real-time alignment adjustment function on a printing position in an ink-jet printing process, and is beneficial to improving the alignment accuracy.
In order to achieve the purpose, the invention provides the following technical scheme:
an OLED display panel ink-jet printing alignment method comprises the steps that a glass substrate is placed on a glass substrate conveying table, alignment is carried out through alignment marks, a nozzle printing position is corrected through an alignment system before next position ink-jet printing operation is carried out, and the method for correcting the nozzle printing position through the alignment system comprises the following steps:
collecting image information of a glass substrate;
comparing and analyzing the image information with preset information and calculating the offset of the printing position;
and correcting the printing position of the spray head according to the offset of the printing position.
According to the OLED display panel ink-jet printing alignment method, firstly, a glass substrate is placed on a glass substrate transmission table, preliminary alignment operation of the glass substrate is carried out through alignment marks, then, before next position ink-jet printing operation is carried out, the printing position of a spray head is adjusted and corrected through an alignment system, specifically, before next position ink-jet printing operation is carried out, image information of the current state of the glass substrate is collected, then, the image information is compared with preset information for analysis, the printing position offset of the spray head relative to the position of the glass substrate is deduced, and the printing position of the spray head is corrected through the printing position offset.
According to the OLED display panel ink-jet printing alignment method, the alignment state of the glass substrate and the spray head is monitored through the alignment system before each next position ink-jet printing operation is carried out, and the printing position of the spray head is corrected according to the printing position offset, so that the alignment printing precision of ink drops sprayed by the spray head and pattern electrodes on the glass substrate during next position ink-jet printing is improved, and poor uniformity caused by misalignment is avoided.
Therefore, the OLED display panel ink-jet printing alignment method adopts an image tracking technology, realizes the real-time alignment adjustment function of the printing position in the ink-jet printing process, and is beneficial to improving the alignment accuracy.
Preferably, the acquired image information of the glass substrate is acquired after the inkjet printing operation at the current position is completed and before the inkjet printing operation at the next position is performed, and the acquired image information includes actual position information of ink droplets formed after the inkjet printing operation at the current position is completed, and the preset information includes preset position information of pattern electrodes on the glass substrate;
the comparing and analyzing the image information and the preset information and calculating the printing position offset specifically comprises: and comparing the actual position information of the ink drops on the glass substrate with the preset position information of the pattern electrode, calculating the position offset of the ink drops along the x direction and the position offset along the y direction, and calculating the printing position offset through the position offset along the x direction and the position offset along the y direction.
Preferably, the preset information further includes ink droplet preset position information;
the comparing and analyzing the image information and the preset information and calculating the printing position offset specifically further comprise: comparing the actual position information of the ink drop on the glass substrate with the preset position information of the ink drop, calculating the position offset of the ink drop along the x direction and the position offset along the y direction, and calculating the auxiliary printing position offset through the position offset of the ink drop along the x direction and the position offset along the y direction;
the correcting the printing position of the nozzle according to the printing position offset further comprises: and performing auxiliary correction on the printing position of the spray head according to the auxiliary printing position offset.
Preferably, the image information of the glass substrate is collected when the current position inkjet printing operation is performed and before the next position inkjet printing operation is performed, the image information includes actual position information of the pattern electrode at least one next printing position, and the preset information includes preset position information of the pattern electrode on the glass substrate;
the comparing and analyzing the image information and the preset information and calculating the printing position offset specifically comprises: and comparing the actual position information of the pattern electrode at least one next printing position with the preset position information of the pattern electrode, calculating the position offset of the pattern electrode along the x direction and the position offset of the pattern electrode along the y direction, and calculating the printing position offset through the position offset of the pattern electrode along the x direction and the position offset of the pattern electrode along the y direction.
Preferably, before the next position inkjet printing operation is performed on the collected image information of the glass substrate, the collected image information includes actual position information of an ink droplet formed after the current position inkjet printing operation is completed, and actual position information of a pattern electrode at least one next printing position, and the preset information includes preset position information of the pattern electrode on the glass substrate;
the comparing and analyzing the image information and the preset information and calculating the printing position offset specifically comprises:
comparing the actual position information of the ink drops on the glass substrate with the preset position information of the pattern electrode, calculating the position offset of the ink drops along the x direction and the position offset along the y direction, and calculating a first printing position offset through the position offset along the x direction and the position offset along the y direction;
comparing the actual position information of the pattern electrode at least one next printing position with the preset position information of the pattern electrode, calculating the position offset of the pattern electrode along the x direction and the position offset of the pattern electrode along the y direction, and calculating a second printing position offset through the position offset of the pattern electrode along the x direction and the position offset of the pattern electrode along the y direction;
the correcting the printing position of the nozzle according to the printing position offset specifically comprises: and performing auxiliary correction on the printing position of the spray head according to the first printing position offset, and performing auxiliary correction on the printing position of the spray head according to the second printing position offset.
Preferably, the method for correcting the printing position of the nozzle by the alignment system further comprises:
and after the printing position offset is calculated, comparing the printing position offset with a threshold offset, if the printing position offset exceeds the threshold range, correcting the printing position of the spray head according to the printing position offset, and if the printing position offset does not exceed the threshold range, not correcting the printing position of the spray head.
The invention also provides an inkjet printing alignment device of the OLED display panel, which comprises a spray head, an image data acquisition unit, an image data processing unit and a position correction unit;
the image data acquisition unit is used for acquiring image information of the glass substrate;
the image data processing unit is used for carrying out comparison analysis according to the image information and preset information and calculating the offset of the printing position;
and the position correction unit is used for correcting the printing position of the spray head according to the printing position offset.
Preferably, when the image information acquired by the image data acquisition unit includes actual position information of an ink droplet formed after the inkjet printing operation at the current position is completed, and the preset information includes preset position information of a pattern electrode on the glass substrate, the image data processing unit is further configured to compare the actual position information of the ink droplet on the glass substrate with the preset position information of the pattern electrode, calculate a position offset of the ink droplet along the x direction and a position offset along the y direction, and calculate a printing position offset through the position offset along the x direction and the position offset along the y direction.
Preferably, when the preset information further includes preset position information of an ink droplet, the image data processing unit is further configured to compare actual position information of the ink droplet on the glass substrate with the preset position information of the ink droplet, calculate a position offset of the ink droplet along the x direction and a position offset along the y direction, and calculate an auxiliary printing position offset by the position offset of the ink droplet along the x direction and the position offset along the y direction;
and the position correction unit is also used for performing auxiliary correction on the printing position of the spray head according to the auxiliary printing position offset.
Preferably, when the image information collected by the image data collecting unit includes actual position information of the pattern electrode at least one next printing position, and the preset information includes preset position information of the pattern electrode on the glass substrate, the image data processing unit is further configured to compare the actual position information of the pattern electrode at the at least one next printing position with the preset position information of the pattern electrode, calculate a position offset of the pattern electrode in the x direction and a position offset of the pattern electrode in the y direction, and calculate the printing position offset through the position offset of the pattern electrode in the x direction and the position offset of the pattern electrode in the y direction.
Preferably, when the collected image information includes actual position information of ink droplets formed after the completion of the inkjet printing operation at the current position, and actual position information of the pattern electrode at least one next printing position, the preset information includes preset position information of the pattern electrode on the glass substrate,
the image data processing unit is used for comparing the actual position information of the ink drops on the glass substrate with the preset position information of the pattern electrode, calculating the position offset of the ink drops along the x direction and the position offset along the y direction, and calculating a first printing position offset through the position offset along the x direction and the position offset along the y direction;
the image data processing unit is also used for comparing the actual position information of the pattern electrode at least one next printing position with the preset position information of the pattern electrode, calculating the position offset of the pattern electrode along the x direction and the position offset of the pattern electrode along the y direction, and calculating a second printing position offset through the position offset of the pattern electrode along the x direction and the position offset of the pattern electrode along the y direction;
and the position correction unit is used for performing auxiliary correction on the printing position of the spray head according to the first printing position offset and performing auxiliary correction on the printing position of the spray head according to the second printing position offset.
Preferably, the image processing device further comprises a judging unit, wherein the judging unit is used for comparing the printing position offset with a threshold offset after the image data processing unit calculates the printing position offset, if the printing position offset exceeds a threshold range, the position correcting unit is controlled to correct the printing position of the nozzle according to the printing position offset, and if the printing position offset does not exceed the threshold range, the position correcting unit is controlled not to correct the printing position of the nozzle.
Drawings
Fig. 1 is a flowchart of an inkjet printing alignment method for an OLED display panel according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an inkjet printing alignment method for an OLED display panel according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an inkjet printing alignment method for an OLED display panel according to an embodiment of the present invention;
FIG. 4 is a schematic view of an inkjet printing alignment method for an OLED display panel according to an embodiment of the present invention;
FIG. 4 is a schematic view of an inkjet printing alignment method for an OLED display panel according to an embodiment of the present invention;
fig. 5 is a schematic view of an inkjet printing alignment apparatus for an OLED display panel according to an embodiment of the present invention;
FIG. 6 is a schematic view of an inkjet printing alignment apparatus for an OLED display panel according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an inkjet printing alignment apparatus for an OLED display panel according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides an inkjet printing alignment method for an OLED display panel, including steps S101: placing the glass substrate on a glass substrate transmission table, and aligning through the alignment mark;
before the next position ink-jet printing operation is carried out, the printing position of the nozzle is corrected through the alignment system, and the method for correcting the printing position of the nozzle through the alignment system comprises the following steps:
step S102: collecting image information of a glass substrate;
step S103: comparing and analyzing the image information with preset information, and calculating the offset of the printing position;
step S104: and correcting the printing position of the nozzle according to the offset of the printing position.
In the inkjet printing alignment method for the OLED display panel, firstly, the glass substrate is placed on a glass substrate transmission table, preliminary alignment operation of the glass substrate is carried out through an alignment mark, then, before next position inkjet printing operation is carried out, the printing position of the spray head is adjusted and corrected through an alignment system, specifically, before next position inkjet printing operation is carried out, image information of the current state of the glass substrate is collected, then, the image information is compared with preset information for analysis, the printing position offset of the spray head relative to the position of the glass substrate is deduced, and the printing position of the spray head is corrected through the printing position offset, and is specifically shown in FIG. 2.
According to the OLED display panel ink-jet printing alignment method, the alignment state of the glass substrate and the spray head is monitored through the alignment system before each next position ink-jet printing operation is carried out, and the printing position of the spray head is corrected according to the printing position offset, so that the alignment printing precision of ink drops sprayed by the spray head and pattern electrodes on the glass substrate during next position ink-jet printing is improved, and poor uniformity caused by misalignment is avoided.
Therefore, the OLED display panel ink-jet printing alignment method adopts an image tracking technology, realizes the real-time alignment adjustment function of the printing position in the ink-jet printing process, and is beneficial to improving the alignment accuracy.
An alternative embodiment: acquiring image information of the glass substrate after the ink-jet printing operation at the current position is finished and before the ink-jet printing operation at the next position is carried out, wherein the acquired image information comprises actual position information of ink drops formed after the ink-jet printing operation at the current position is finished, and the preset information comprises preset position information of pattern electrodes on the glass substrate;
the comparing and analyzing the image information and the preset information and calculating the printing position offset specifically comprises the following steps: and comparing the actual position information of the ink drops on the glass substrate with the preset position information of the pattern electrode, calculating the position offset of the ink drops along the x direction and the position offset along the y direction, and calculating the printing position offset through the position offset along the x direction and the position offset along the y direction.
On the basis of the technical scheme, the preset information also comprises preset position information of the ink drops;
according to the image information and the preset information, the printing position offset is compared and analyzed, and the method further comprises the following steps: comparing the actual position information of the ink drop on the glass substrate with the preset position information of the ink drop, calculating the position offset of the ink drop along the x direction and the position offset along the y direction, and calculating the auxiliary printing position offset through the position offset of the ink drop along the x direction and the position offset along the y direction;
correcting the print position of the nozzle according to the print position offset further includes: and performing auxiliary correction on the printing position of the spray head according to the offset of the auxiliary printing position.
It should be noted that, in one printing position, the head may print only one ink droplet, or may print a plurality of ink droplets, and the specific number of prints may be set according to actual needs, which is not limited herein.
Take the example that the nozzle has completed the ink-jet printing operation at the first position, and the nozzle ejects a plurality of groups of ink droplets at a time:
and after the ink drops fall on the pattern electrode at the first position of the glass substrate, acquiring image information of the glass substrate, comparing and analyzing the image information with preset information, calculating the printing position offset, and correcting the position of the spray head according to the printing position offset. As shown in fig. 3, the actual position information of the ink drop captured in the image information, the preset position information of the ink drop, and the preset position information of the pattern electrode are simulated and compared, the deviation distance between the actual position information of a plurality of groups of ink drops and the preset position information of the pattern electrode is measured and calculated at two reference edges in two directions, the acquired actual position information of the ink drop is compared with the preset position information of the ink drop, the deviation distance of the plurality of groups of ink drops in two directions of 'x' and 'y' is measured and calculated, then the two acquired deviation data are combined, the accurate deviation distance of the ink drops in two directions of 'x' and 'y' is calculated through the algorithm of program modeling, the printing position deviation is calculated on the basis, and before the nozzle moves to the next electrode, the printing position of the nozzle is corrected according to the printing position deviation.
Another alternative embodiment: acquiring image information of a glass substrate, wherein the image information comprises actual position information of a pattern electrode at least one next printing position when the current position ink-jet printing operation is carried out and before the next position ink-jet printing operation is carried out, and the preset information comprises preset position information of the pattern electrode on the glass substrate;
according to the image information and the preset information, the printing position offset is compared and analyzed, and calculated, and the method comprises the following steps: and comparing the actual position information of the pattern electrode at least one next printing position with the preset position information of the pattern electrode, calculating the position offset of the pattern electrode along the x direction and the position offset of the pattern electrode along the y direction, and calculating the printing position offset through the position offset of the pattern electrode along the x direction and the position offset of the pattern electrode along the y direction.
A specific embodiment is now provided:
the actual position information of the second or third pattern electrode is collected in advance (which can be set according to product characteristics) when the nozzle prints the first electrode, as shown in fig. 4, when the nozzle prints at the position "1", the actual position information of the pattern electrode at the position "2" or "3" along the printing direction is collected, the collected actual position information of the pattern electrode is compared with the preset position information of the pattern electrode, meanwhile, a plurality of groups of offset data are simulated in the two directions of "x" and "y", then, the accurate offset distance of the pattern electrode in the two directions of "x" and "y" is calculated through an algorithm of program modeling, and the offset of the printing position is calculated on the basis. The printing position offset is transmitted to and temporarily stored, before the spray head moves to the next printing position, the printing position offset is read and the position of the spray head is corrected, the process is carried out circularly, deviation measurement and adjustment are carried out in advance before each time of ink jet printing, the alignment tracking adjustment of the whole process of glass substrate printing is realized, and the precision is ensured.
Another alternative embodiment: before the next position ink-jet printing operation is carried out on the collected image information of the glass substrate, the collected image information comprises actual position information of ink drops formed after the current position ink-jet printing operation is finished and actual position information of pattern electrodes of at least one next printing position, and the preset information comprises preset position information of the pattern electrodes on the glass substrate;
the comparing and analyzing the image information and the preset information and calculating the printing position offset specifically comprises the following steps:
comparing the actual position information of the ink drops on the glass substrate with the preset position information of the pattern electrode, calculating the position offset of the ink drops along the x direction and the position offset along the y direction, and calculating a first printing position offset through the position offset along the x direction and the position offset along the y direction;
comparing the actual position information of the pattern electrode at least one next printing position with the preset position information of the pattern electrode, calculating the position offset of the pattern electrode along the x direction and the position offset of the pattern electrode along the y direction, and calculating a second printing position offset through the position offset of the pattern electrode along the x direction and the position offset of the pattern electrode along the y direction;
correcting the printing position of the nozzle according to the offset of the printing position specifically comprises: and performing auxiliary correction on the printing position of the spray head according to the first printing position offset, and performing auxiliary correction on the printing position of the spray head according to the second printing position offset.
In this embodiment, the printing position offset amount includes a first printing position offset amount calculated from the ink droplet and a second printing position offset amount calculated from the pattern electrode position, and the printing position of the head is corrected by the first printing position offset amount and the second printing position offset amount, so that the correction speed can be increased, and the printing speed of the entire apparatus can be increased. On the basis of the technical scheme, the method for correcting the printing position of the nozzle by the alignment system in the inkjet printing alignment method of the OLED display panel further comprises the following steps:
and after the printing position offset is calculated, comparing the printing position offset with a threshold offset, if the printing position offset exceeds the threshold range, correcting the printing position of the spray head according to the printing position offset, and if the printing position offset does not exceed the threshold range, not correcting the printing position of the spray head.
Note that the shift allowable error value of the head may be derived from the print allowable error value of the ink droplets and set as a threshold range, and when the print position shift amount is within the threshold range, adjustment of the print position of the head is not performed. It should be noted that the method can reduce the correction times of the nozzle within the error allowable range, and accelerate the speed of the ink-jet printing of the printing, thereby reducing the production cost.
On the basis of the above technical solution, it should be noted that the calibration frequency for the nozzles may be set as needed, specifically, the calibration may be set based on a fixed time interval, or the print scan distance may be set fixedly.
Depending on the characteristics of the device, a preferred embodiment is now provided, which allows a correction to be made over a plurality of scanning intervals, in order to ensure the operational stability of the device.
Referring to fig. 5, the present invention further provides an inkjet printing alignment apparatus for an OLED display panel, including a nozzle, an image data acquisition unit, an image data processing unit, and a position correction unit;
the image data acquisition unit is used for acquiring image information of the glass substrate;
the image data processing unit is used for carrying out comparison analysis according to the image information and preset information and calculating the offset of the printing position;
and the position correction unit is used for correcting the printing position of the spray head according to the printing position offset.
In the above-mentioned OLED display panel inkjet printing aligning device, the OLED display panel inkjet printing aligning device includes a nozzle, an image data acquisition unit, an image data processing unit and a position correction unit. When the OLED printing operation is carried out by adopting the equipment, firstly, the glass substrate is placed on the glass substrate transmission table, the preliminary alignment operation of the glass substrate is carried out through the alignment mark, then, before the next position ink-jet printing operation is carried out, the printing position of the spray head is adjusted and corrected through the alignment system, specifically, before the next position ink-jet printing operation is carried out, the image data acquisition unit acquires the image information of the current state of the glass substrate, then, the image data processing unit carries out comparison analysis on the image information and preset information, deduces the printing position offset of the spray head relative to the position of the glass substrate, and corrects the printing position of the spray head through the position correction unit.
According to the OLED display panel ink-jet printing alignment device, before each 'next position ink-jet printing operation' is carried out, the alignment state of the glass substrate and the spray head is monitored through the image data acquisition unit, and the printing position of the spray head is corrected through the position correction unit according to the printing position offset obtained by the image data processing unit, so that the alignment printing precision of ink drops sprayed by the spray head and pattern electrodes on the glass substrate during ink-jet printing at the next position is improved, and poor uniformity caused by misalignment is avoided.
As an optional implementation manner, when the image information acquired by the image data acquisition unit includes actual position information of an ink droplet formed after the inkjet printing operation at the current position is completed, and the preset information includes preset position information of a pattern electrode on the glass substrate, the image data processing unit is further configured to compare the actual position information of the ink droplet on the glass substrate with the preset position information of the pattern electrode, calculate a position offset of the ink droplet along the x direction and a position offset along the y direction, and calculate a printing position offset through the position offset along the x direction and the position offset along the y direction.
On the basis of the technical scheme, when the preset information further comprises preset position information of the ink drop, the image data processing unit is further used for comparing the actual position information of the ink drop on the glass substrate with the preset position information of the ink drop, calculating the position offset of the ink drop along the x direction and the position offset along the y direction, and calculating the auxiliary printing position offset through the position offset of the ink drop along the x direction and the position offset along the y direction;
and the position correction unit is also used for performing auxiliary correction on the printing position of the spray head according to the auxiliary printing position offset.
Take the example that the nozzle has completed the ink-jet printing operation at the first position, and the nozzle ejects a plurality of groups of ink droplets at a time:
after the ink drops fall on the pattern electrode at the first position of the glass substrate, the image data acquisition unit acquires the image information of the glass substrate, the image data processing unit compares the image information with preset information and analyzes the image information and calculates the offset of the printing position, and the position correction unit corrects the position of the spray head according to the offset of the printing position. As shown in fig. 3, the image data processing unit simulates and compares actual position information of ink droplets captured in the image information with preset position information of ink droplets and preset position information of pattern electrodes, simultaneously, the deviation distance between the actual position information of a plurality of groups of ink drops and the preset position information of the pattern electrode is measured and calculated on two reference sides in two directions, meanwhile, the actual position information of the collected ink drops is compared with the preset position information of the ink drops, the offset distances of a plurality of groups of ink drops along the directions of 'x' and 'y' are measured and calculated, then combining the collected two offset data, calculating the offset distance of the accurate ink drop in two directions of 'x' and 'y' by an algorithm of program modeling, calculating the offset of the printing position on the basis, the position correcting unit corrects the printing position of the head according to the printing position offset amount before the head moves to the next electrode.
In another optional embodiment, when the image information collected by the image data collecting unit includes actual position information of the pattern electrode at least one next printing position, and the preset information includes preset position information of the pattern electrode on the glass substrate, the image data processing unit is further configured to compare the actual position information of the pattern electrode at the at least one next printing position with the preset position information of the pattern electrode, calculate a position offset of the pattern electrode along the x direction and a position offset of the pattern electrode along the y direction, and calculate the printing position offset through the position offset of the pattern electrode along the x direction and the position offset of the pattern electrode along the y direction.
A specific embodiment is now provided:
when the nozzle prints the first electrode, the image data acquisition unit acquires the actual position information (which can be set according to product characteristics) of the second or third pattern electrode in advance, as shown in fig. 4, when the nozzle prints at the position "1", the image data acquisition unit acquires the actual position information of the pattern electrode at the position "2" or "3" along the printing direction, the image data processing unit compares the acquired actual position information of the pattern electrode with the preset position information of the pattern electrode, simultaneously simulates a plurality of groups of offset data in the directions "x" and "y", then calculates the accurate offset distance of the pattern electrode along the directions "x" and "y" through the algorithm of program modeling, and calculates the offset of the printing position on the basis. The printing position offset is transmitted to and temporarily stored, the position correction unit reads the printing position offset and corrects the position of the spray head before the spray head moves to the next printing position, the process is carried out circularly, deviation measurement and adjustment are carried out in advance before each time of ink jet printing, alignment tracking adjustment of the whole process of printing the glass substrate is realized, and the precision is ensured.
Another alternative embodiment: when the acquired image information includes actual position information of ink droplets formed after the completion of the inkjet printing operation at the current position and actual position information of the pattern electrode at least one next printing position, and the preset information includes preset position information of the pattern electrode on the glass substrate,
the image data processing unit is used for comparing the actual position information of the ink drops on the glass substrate with the preset position information of the pattern electrode, calculating the position offset of the ink drops along the x direction and the position offset along the y direction, and calculating a first printing position offset through the position offset along the x direction and the position offset along the y direction;
the image data processing unit is also used for comparing the actual position information of the pattern electrode at least one next printing position with the preset position information of the pattern electrode, calculating the position offset of the pattern electrode along the x direction and the position offset of the pattern electrode along the y direction, and calculating a second printing position offset through the position offset of the pattern electrode along the x direction and the position offset of the pattern electrode along the y direction;
and the position correction unit is used for performing auxiliary correction on the printing position of the spray head according to the first printing position offset and performing auxiliary correction on the printing position of the spray head according to the second printing position offset.
In this embodiment, the printing position offset amount includes a first printing position offset amount calculated from the ink droplet and a second printing position offset amount calculated from the pattern electrode position, and the position correction unit corrects the printing position of the head by the first printing position offset amount and the second printing position offset amount, so that the correction speed can be increased, and the printing speed of the entire apparatus can be increased.
On the basis of the technical scheme, the inkjet printing alignment device for the OLED display panel further comprises a judging unit, wherein the judging unit is used for comparing the printing position offset with the threshold offset after the image data processing unit calculates the printing position offset, if the printing position offset exceeds the threshold range, the position correcting unit is controlled to correct the printing position of the nozzle according to the printing position offset, and if the printing position offset does not exceed the threshold range, the position correcting unit is controlled not to correct the printing position of the nozzle.
On the basis of the technical scheme, it needs to be explained that the image data acquisition unit mainly comprises a light source, an image acquisition camera or an image acquisition sensor, and the unit acquires a glass substrate alignment image in the printing process; the image data processing unit consists of a computer and a complex computing program; referring to fig. 6, the motion control unit converts the received offset of the printing position into an electrical signal and directly controls the servo motor in the position correction unit to move to correct the offset of the nozzle in both directions X and Y.
It is worth noting that the above processes are performed in a high-frequency (up to tens of hertz and above) cycle, the minimum position compensation can reach 1 μm or less, the whole cycle can be completed before the nozzle moves to the next printing position, the alignment correction is realized, and the printing alignment accuracy is ensured, so that the great problem of uniformity and related defects caused by alignment deviation in the inkjet printing of the OLED luminescent material is solved.
It should be noted that each group of printer nozzles may be provided with an individual position correction unit to independently complete position correction, the alignment system sends an alignment offset correction instruction to the inkjet printing device, and the inkjet printing device controls the printer nozzles to perform position adjustment in the X and Y directions to complete offset correction. On the basis, the position correction unit in fig. 5 can be integrated in the printer, the motion control unit can be arranged in the head of the device, or the motion control unit can be integrated in the printer, the position correction unit is integrated on each group of nozzles, and the servo motors correspond to the nozzles one by one and control the nozzles to perform position correction.
Or, the position control unit, the image data acquisition unit and the image data processing unit are arranged in the real alignment system in fig. 5, and the position correction unit is arranged independently, that is, the whole head of the device is arranged as the position correction unit and works in cooperation with the printer and the alignment system.
Alternatively, the position correcting unit may be provided on the head movement control system or on the substrate movement control system.
As shown in fig. 7, the inkjet printing alignment apparatus for an OLED display panel provided by the present invention includes a printing device 1, an alignment system 2, a device head 3, a nozzle 4, a light source 5, a camera or a sensor 6, a glass conveying table 7, a glass substrate 8, and a substrate pattern 9.
It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. The method for aligning the inkjet printing of the OLED display panel is characterized by comprising the steps of placing a glass substrate on a glass substrate conveying table, aligning through an alignment mark, and correcting the printing position of a spray head through an alignment system before the next inkjet printing operation at the position is carried out, wherein the method for correcting the printing position of the spray head through the alignment system comprises the following steps:
collecting image information of a glass substrate;
comparing and analyzing the image information with preset information and calculating the offset of the printing position;
correcting the printing position of the spray head according to the offset of the printing position;
the method comprises the steps that image information of a glass substrate is collected after ink-jet printing operation at the current position is completed and before next ink-jet printing operation at the next position is performed, the collected image information comprises actual position information of ink drops formed after the ink-jet printing operation at the current position is completed, and the preset information comprises preset position information of a pattern electrode on the glass substrate;
the comparing and analyzing the image information and the preset information and calculating the printing position offset specifically comprises: and comparing the actual position information of the ink drops on the glass substrate with the preset position information of the pattern electrode, calculating the position offset of the ink drops along the x direction and the position offset along the y direction, and calculating the printing position offset through the position offset along the x direction and the position offset along the y direction.
2. The OLED display panel inkjet printing alignment method of claim 1, wherein the preset information further comprises ink drop preset position information;
the comparing and analyzing the image information and the preset information and calculating the printing position offset specifically further comprise: comparing the actual position information of the ink drop on the glass substrate with the preset position information of the ink drop, calculating the position offset of the ink drop along the x direction and the position offset along the y direction, and calculating the auxiliary printing position offset through the position offset of the ink drop along the x direction and the position offset along the y direction;
the correcting the printing position of the nozzle according to the printing position offset further comprises: and performing auxiliary correction on the printing position of the spray head according to the auxiliary printing position offset.
3. The OLED display panel ink-jet printing alignment method according to claim 1, wherein the image information of the collected glass substrate includes actual position information of the pattern electrode at least one next printing position when the current position ink-jet printing operation is performed and before the next position ink-jet printing operation is performed, and the preset information includes preset position information of the pattern electrode on the glass substrate;
the comparing and analyzing the image information and the preset information and calculating the printing position offset specifically comprises: and comparing the actual position information of the pattern electrode at least one next printing position with the preset position information of the pattern electrode, calculating the position offset of the pattern electrode along the x direction and the position offset of the pattern electrode along the y direction, and calculating the printing position offset through the position offset of the pattern electrode along the x direction and the position offset of the pattern electrode along the y direction.
4. The inkjet printing alignment method of the OLED display panel according to claim 1, wherein the image information of the glass substrate is collected before the next inkjet printing operation is performed, the collected image information includes actual position information of ink droplets formed after the inkjet printing operation at the current position is completed, and actual position information of the pattern electrode at least one next printing position, and the preset information includes preset position information of the pattern electrode on the glass substrate;
the comparing and analyzing the image information and the preset information and calculating the printing position offset specifically comprises:
comparing the actual position information of the ink drops on the glass substrate with the preset position information of the pattern electrode, calculating the position offset of the ink drops along the x direction and the position offset along the y direction, and calculating a first printing position offset through the position offset along the x direction and the position offset along the y direction;
comparing the actual position information of the pattern electrode at least one next printing position with the preset position information of the pattern electrode, calculating the position offset of the pattern electrode along the x direction and the position offset of the pattern electrode along the y direction, and calculating a second printing position offset through the position offset of the pattern electrode along the x direction and the position offset of the pattern electrode along the y direction;
the correcting the printing position of the nozzle according to the printing position offset specifically comprises: and performing auxiliary correction on the printing position of the spray head according to the first printing position offset, and performing auxiliary correction on the printing position of the spray head according to the second printing position offset.
5. The OLED display panel inkjet printing alignment method of any one of claims 1-4, wherein the method for correcting the print head printing position through the alignment system further comprises:
and after the printing position offset is calculated, comparing the printing position offset with a threshold offset, if the printing position offset exceeds the threshold range, correcting the printing position of the spray head according to the printing position offset, and if the printing position offset does not exceed the threshold range, not correcting the printing position of the spray head.
6. An OLED display panel ink-jet printing alignment device is characterized by comprising a spray head, an image data acquisition unit, an image data processing unit and a position correction unit;
the image data acquisition unit is used for acquiring image information of the glass substrate;
the image data processing unit is used for carrying out comparison analysis according to the image information and preset information and calculating the offset of the printing position;
the position correction unit is used for correcting the printing position of the spray head according to the printing position offset;
when the image information acquired by the image data acquisition unit comprises actual position information of an ink drop formed after the ink-jet printing operation at the current position is completed, and the preset information comprises preset position information of a pattern electrode on a glass substrate, the image data processing unit is also used for comparing the actual position information of the ink drop on the glass substrate with the preset position information of the pattern electrode, calculating the position offset of the ink drop along the x direction and the position offset along the y direction, and calculating the printing position offset through the position offset along the x direction and the position offset along the y direction.
7. The OLED display panel inkjet printing alignment device of claim 6, wherein when the preset information further includes preset position information of ink droplets, the image data processing unit is further configured to compare the actual position information of the ink droplets on the glass substrate with the preset position information of the ink droplets, calculate a position offset of the ink droplets along the x direction and a position offset of the ink droplets along the y direction, and calculate an auxiliary printing position offset according to the position offset of the ink droplets along the x direction and the position offset of the ink droplets along the y direction;
and the position correction unit is also used for performing auxiliary correction on the printing position of the spray head according to the auxiliary printing position offset.
8. The OLED display panel inkjet printing alignment device of claim 6, wherein when the image information collected by the image data collection unit includes actual position information of the pattern electrode at least one next printing position, and the preset information includes preset position information of the pattern electrode on the glass substrate, the image data processing unit is further configured to compare the actual position information of the pattern electrode at the at least one next printing position with the preset position information of the pattern electrode, calculate a position offset of the pattern electrode along the x direction and a position offset of the pattern electrode along the y direction, and calculate the printing position offset through the position offset of the pattern electrode along the x direction and the position offset of the pattern electrode along the y direction.
9. The OLED display panel inkjet printing alignment device of claim 6, wherein when the collected image information includes actual position information of ink droplets formed after the inkjet printing operation at the current position is completed and actual position information of the pattern electrode at least one next printing position, the preset information includes preset position information of the pattern electrode on the glass substrate,
the image data processing unit is used for comparing the actual position information of the ink drops on the glass substrate with the preset position information of the pattern electrode, calculating the position offset of the ink drops along the x direction and the position offset along the y direction, and calculating a first printing position offset through the position offset along the x direction and the position offset along the y direction;
the image data processing unit is also used for comparing the actual position information of the pattern electrode at least one next printing position with the preset position information of the pattern electrode, calculating the position offset of the pattern electrode along the x direction and the position offset of the pattern electrode along the y direction, and calculating a second printing position offset through the position offset of the pattern electrode along the x direction and the position offset of the pattern electrode along the y direction;
and the position correction unit is used for performing auxiliary correction on the printing position of the spray head according to the first printing position offset and performing auxiliary correction on the printing position of the spray head according to the second printing position offset.
10. The inkjet printing alignment device of any one of claims 6 to 9, further comprising a determination unit configured to compare a printing position offset amount with a threshold offset amount after the image data processing unit calculates the printing position offset amount, control the position correction unit to correct the printing position of the nozzle according to the printing position offset amount if the printing position offset amount exceeds a threshold range, and control the position correction unit not to perform the operation of correcting the printing position of the nozzle if the printing position offset amount does not exceed the threshold range.
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| CN110416411B (en) * | 2019-08-30 | 2022-11-01 | 昆山国显光电有限公司 | Ink-jet printing alignment substrate and ink-jet printing device |
| CN111038114B (en) * | 2019-11-13 | 2021-03-16 | 深圳市华星光电半导体显示技术有限公司 | Ink-jet printing device and method for preparing organic light-emitting diode display panel |
| CN111708190B (en) * | 2020-06-08 | 2023-02-28 | 苏州精濑光电有限公司 | Method and device for adjusting pair-to-pair bonding parameters, pair-to-pair bonding system and medium |
| CN112140720A (en) * | 2020-09-30 | 2020-12-29 | 襄阳和顺发彩色印刷有限公司 | Color box green printing system based on dual induction |
| CN113224119B (en) * | 2021-04-28 | 2022-09-13 | 合肥京东方卓印科技有限公司 | Display panel, manufacturing method thereof and display device |
| CN114185498A (en) * | 2021-12-07 | 2022-03-15 | 久明国际文化(北京)有限公司 | Ancient painting and calligraphy copying and toning method |
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