CN110406266B - Inkjet printing apparatus and inkjet printing method - Google Patents
Inkjet printing apparatus and inkjet printing method Download PDFInfo
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- CN110406266B CN110406266B CN201910813250.XA CN201910813250A CN110406266B CN 110406266 B CN110406266 B CN 110406266B CN 201910813250 A CN201910813250 A CN 201910813250A CN 110406266 B CN110406266 B CN 110406266B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
Abstract
The application provides an ink-jet printing device and an ink-jet printing method, and relates to the technical field of display. The inkjet printing apparatus for spraying ink onto a target substrate includes: an ink jet assembly comprising a nozzle that sprays the ink; and a heating assembly including an emission nozzle emitting a heat source beam; the heat source beam is used for heating the ink on the target substrate, and the energy density of the heat source beam is decreased from the center to the periphery on the cross section of the heat source beam. In the embodiment of the application, since the energy density of the heat source beam decreases from the center to the periphery in the cross section of the heat source beam, the solidification speed of the middle area of the ink in the accommodating hole is increased to a higher degree than that of the edge area, and the ink flowing from the middle area to the edge area can be reduced.
Description
Technical Field
The present disclosure relates to inkjet printing technologies, and particularly to an inkjet printing apparatus and an inkjet printing method.
Background
At present, the problem of uneven thickness of a film layer prepared by ink-jet printing exists. Therefore, how to improve the uniformity of the film layer prepared by the inkjet printing technology becomes an urgent problem to be solved.
Disclosure of Invention
In view of this, embodiments of the present application are directed to providing an inkjet printing apparatus and an inkjet printing method to solve the problem in the prior art that the uniformity of a film layer prepared by an inkjet printing technology is poor.
One aspect of the present application provides an inkjet printing apparatus including: at least one ink jet module comprising nozzles that spray the ink; and at least one heating assembly comprising an emission nozzle emitting a heat source beam; the heat source beam is used for heating the sprayed ink, and the energy density of the heat source beam is decreased from the center to the periphery on the cross section of the heat source beam.
In one embodiment of the present application, when the nozzle sprays a plurality of the inks to a target substrate, the emission nozzle moves relative to the target substrate along a formation trajectory of the plurality of the inks.
In one embodiment of the present application, the inkjet printing apparatus further includes a driving assembly configured to simultaneously drive the nozzle and the nozzle to move.
In one embodiment of the present application, the spacing between the nozzle and the emission nozzle is adjustable.
In one embodiment of the present application, the inkjet printing apparatus further comprises a direction guide assembly comprising a guide rail; the ink jet assembly slides along the guide rail and can be fixed; and/or the heating assembly slides along the guide rail and can be fixed.
In one embodiment of the present application, the heat source beam includes at least one of a laser beam, an infrared beam, an ultraviolet beam, and a visible beam.
In one embodiment of the present application, the heating assembly further comprises a heat source generator, a continuous attenuation mirror, a beam expanding mirror, and a focusing mirror; and the heat source generated by the heat source generator sequentially passes through the continuous attenuating lens, the beam expanding lens and the focusing lens to form the heat source beam.
Another aspect of the present application provides an inkjet printing method, including: a nozzle of the ink jet assembly sprays ink to a target substrate; the ink jet assembly and the heating assembly move relative to the target substrate for a preset distance so that the ink on the target substrate is opposite to the emission nozzle of the heating assembly; and the emission nozzle emits a heat source beam to the ink on the target substrate, wherein the energy density of the heat source beam is decreased from the center to the periphery.
An aspect of the present application provides that the nozzle of the inkjet assembly sprays another ink toward the target substrate while the emission nozzle emits the heat source beam toward the ink on the target substrate.
An aspect of the present application provides that the spraying of the another ink toward the target substrate by the nozzle of the inkjet assembly while the heat source beam is emitted toward the ink on the target substrate by the emission nozzle includes: after sending a firing command to the firing nozzle of the heating assembly, continuously sending a spray command to the nozzle of the inkjet assembly so that the nozzle sprays the other ink to the target substrate while the heat source beam heats the ink on the target substrate.
In the embodiment of the application, the energy density of the heat source beam is decreased from the center to the periphery on the cross section of the heat source beam, so that the solidification speed of the middle area of the ink in the accommodating hole of the target substrate is increased to a higher degree than that of the edge area, and the ink flowing from the middle area to the edge area can be reduced. That is, the situation that the ink in the middle area flows to the upper part of the edge area can be relieved, so that the problem of uneven thickness of the film layer prepared by the ink-jet printing technology is effectively solved.
Drawings
Fig. 1 is a schematic view of the state of ink in the accommodation hole.
FIG. 2 is a schematic block diagram of an inkjet printing apparatus according to one embodiment of the present application.
Fig. 3 is a schematic structural view of an inkjet printing apparatus according to another embodiment of the present application.
FIG. 4 is a schematic view of a partial structure of a heating assembly according to one embodiment of the present application.
FIG. 5 is a block diagram of an inkjet printing system according to one embodiment of the present application.
FIG. 6 is a schematic flow chart diagram of a method of inkjet printing according to one embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.
Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.
As described in the background art, the film layer prepared by ink-jet printing has a problem of uneven thickness. For example, OLED display devices have been widely used in recent years in devices such as mobile phones as next generation display technologies. At present, the core of the production of the OELD display device is the evaporation technology, but the evaporation technology has the problem of low utilization rate of evaporation materials. In order to solve the problem of low utilization rate of evaporation materials, the inkjet printing technology has become a hot point of research at present. However, the film layer prepared by the inkjet printing technique has a problem of thickness unevenness, thereby seriously affecting the display effect of the OLED display device.
Fig. 1 is a schematic view of the state of the ink 1 in the accommodation hole 22.
It has been found that the ink 1 ejected from the inkjet printing apparatus generally exhibits a convex state in the accommodating hole 22 of the target substrate 2 due to the surface tension, as shown in fig. 1 (a). That is, the ink 1 generally assumes a thick-in-the-middle and thin-at-edge state in the accommodation hole 22. During drying, the edge region of the ink 1 solidifies preferentially over the middle region, since the thickness of the edge region of the ink 1 is less than the thickness of the middle region. That is, when the edge region of the ink 1 solidifies, the middle region will still be in a liquid state. Then, due to the characteristics of the liquid flow, the ink 1 in the middle area flows above the edge area, and the ink 1 flowing above the edge area is solidified above the edge area, so that the solidified ink 1 in the accommodation hole 22 assumes a state of being depressed in the middle, as shown in fig. 1 (b). That is, after drying, the ink 1 assumes a thin state in the middle and thick in the edge in the accommodation hole 22.
Here, the carrier carrying the ink 1 ejected by the inkjet printing apparatus may be referred to as a target substrate 2. When the target substrate 2 is a substrate for preparing an OLED display panel, the target substrate 2 may include a planarization layer 24, an electrode layer 23, and a pixel defining layer, and the electrode layer 23 may be disposed between the planarization layer 24 and the pixel defining layer. The pixel defining layer may include a plurality of pixel defining units 21, and a space between two adjacent pixel defining units 21 may be the accommodating hole 22. The ink 1 in the receiving hole 22 may be used to form an organic light emitting layer so that the target substrate 2 may be used to produce an OLED display panel. That is, the receiving hole 22 may refer to a pixel hole. It should be understood that the receiving hole 22 may be other types of holes, and the embodiment of the present application is not limited to the type of the receiving hole 22.
It can be seen that the ink 1 flowing from the middle region to the edge region in the accommodation hole 22 can be reduced, and the problem of uneven film thickness can be effectively solved.
FIG. 2 is a schematic block diagram of an inkjet printing apparatus according to one embodiment of the present application.
Based on this, the present application provides an inkjet printing apparatus. As shown in fig. 2, the inkjet printing apparatus may be used to spray ink 1 onto a target substrate 2, and may include an inkjet assembly 3 and a heating assembly 4. Here, the inkjet module 3 may include a nozzle 31 that sprays the ink 1. The heating assembly 4 may include an emission nozzle 41 that emits a heat source beam, and the emitted heat source beam may be used to heat the ink 1 on the target substrate 2. The energy density of the heat source bundle decreases from the center to the periphery in the cross section of the heat source bundle. Here, the cross section of the heat source bundle may refer to a section perpendicular to the generation direction of the heat source bundle (as shown by a-a section in fig. 4). The energy density may be energy per unit area. For example, the unit of energy density may be J/cm2。
Specifically, the ink 1 sprayed by the inkjet printing apparatus may be carried in the receiving hole 22 of the target substrate 2. After the nozzle 31 sprays the ink 1 into the receiving hole 22, the nozzle 31 may be moved relative to the receiving hole 22 so that the emission nozzle 41 may be opposed to the ink 1 in the receiving hole 22, so that the heat source beam emitted from the emission nozzle 41 may heat the ink 1 in the receiving hole 22, thereby accelerating the solidification speed of the ink 1 in the receiving hole 22. Here, the heat source bundle may be directed to the ink 1 in the accommodation hole 22 so that the center of the heat source bundle may act on the central projection of the ink 1 in the accommodation hole 22 and may be heated by the heat source bundle from the central area to the edge area of the ink 1. That is, the orthographic projection of the ink 1 on the bottom surface 221 of the accommodating hole 22 may completely cover the orthographic projection of the heat source beam on the bottom surface 221 of the accommodating hole 22.
In the cross section of the heat source beam, since the energy density of the heat source beam decreases from the center to the periphery, the solidification speed of the center region of the ink 1 in the accommodation hole 22 is increased to a higher degree than that of the edge region, and the ink 1 flowing from the center region to the edge region can be reduced. That is, the situation that the ink 1 in the middle area flows to the upper side of the edge area can be relieved, and the problem of uneven thickness of the film layer prepared by the ink jet printing technology is effectively solved.
In one embodiment of the present application, when the nozzle 31 sprays a plurality of inks 1 toward the target substrate 2, the nozzle 41 moves along a formation trajectory of the plurality of inks 1 with respect to the target substrate 2.
Specifically, the emission nozzle 41 may move along the formation trajectory of the plurality of inks 1 on the target substrate 2. Here, the movement of the nozzle 41 is a movement relative to the target substrate 2.
For example, as shown in fig. 2, the nozzle 31 and the nozzle 41 may be arranged in parallel. When the plurality of inks 1 sprayed from the nozzles 31 toward the target substrate 2 are arranged in a column, the extending direction of the column may be parallel to the arrangement direction of the parallel arrangement.
Specifically, after the nozzle 31 of the inkjet module 3 sprays the ink 1 toward the target substrate 2, the nozzle 31 and the ejection nozzle 41 may each move relative to the target substrate 2 in order to facilitate the ejection nozzle 41 to eject the heat source beam toward the ink 1 in the accommodation hole 22.
Here, the arrangement direction of the plurality of inks 1 may represent a moving track of the nozzle 31 with respect to the target substrate 2. The plurality of inks 1 are arranged in a row, and the nozzle 31 moves relative to the target substrate 2 in a direction extending along the row. The parallel arrangement of the nozzle 31 and the nozzle 41 may mean that the nozzle 31 and the nozzle 41 are arranged on a straight line, and the extending direction of the straight line is the arrangement direction of the parallel arrangement.
The nozzle 31 and the nozzle 41 are arranged in parallel, and the extending direction in which the plurality of inks 1 are arranged is parallel to the arrangement direction in which the nozzle 31 and the nozzle 41 are arranged, so that the moving locus of the nozzle 41 with respect to the target substrate 2 can be the same as the moving locus of the nozzle 31 with respect to the target substrate 2. That is, the emission nozzle 41 may move relative to the target substrate 2 along the movement locus of the nozzle 31 so that the emission nozzle 41 may emit the heat source beam toward the ink 1 sprayed from the nozzle 31 on the target substrate 2.
It should be understood that the movement of the nozzle 31 with respect to the target substrate 2 may mean that the target substrate 2 moves while the nozzle 31 is fixed, or that the nozzle 31 moves while the target substrate 2 is fixed. Similarly, the movement of the nozzle 41 with respect to the target substrate 2 may mean that the target substrate 2 moves and the nozzle 41 is fixed, or that the nozzle 41 moves and the target substrate 2 is fixed. The embodiment of the present application is not limited to a specific moving object.
The following describes in detail a case where the nozzle 31 and the nozzle 41 are moved and the target substrate 2 is fixed as an example.
In one embodiment of the present application, the inkjet printing apparatus may further include a driving assembly configured to simultaneously drive the nozzle 31 and the nozzle 41 to move. For example, the moving direction of the nozzle 31 and the nozzle 41 may be parallel to the above-described arrangement direction of the parallel arrangement.
Specifically, when the moving direction of the nozzle 31 and the emission nozzle 41 is parallel to the above-described arrangement direction of the parallel arrangement, the emission nozzle 41 may follow the nozzle 31 to move. When the driving assembly drives the nozzle 31 and the nozzle 41 to move simultaneously, the interval between the nozzle 31 and the nozzle 41 may be fixed. For example, when the target substrate 2 is provided with a plurality of receiving holes 22, and the receiving holes 22 are arranged in a matrix, the pitch between the nozzle 31 and the nozzle 41 may be an integral multiple of the pitch between two adjacent receiving holes 22. Here, the two adjacent receiving holes 22 may be arranged in rows of a matrix or may be arranged in columns of a matrix. The distance that the nozzle 31 and the nozzle 41 move at each movement may be the pitch between the adjacent two receiving holes 22, so that the nozzle 31 can spray the ink 1 for each receiving hole 22. When the nozzle 31 sprays the ink 1, the emission nozzle 41 can emit the heat source beam to the ink 1 already present in the accommodation hole 22 at the same time, so that the ink 1 can be sprayed and the ink 1 can be heated at the same time, thereby accelerating the rate of the inkjet printing.
It should be understood that when the pitch between the nozzle 31 and the nozzle 41 is an integral multiple of the pitch between two adjacent receiving holes 22, and the integral multiple is greater than 1, at least one receiving hole 22 may exist between the nozzle 31 and the nozzle 41, and the ink 1 in the receiving hole 22 is not heated, so that the ink 1 in the receiving hole 22 may sufficiently flow and spread before being heated, thereby further facilitating the formation of a film layer having a uniform thickness.
In one embodiment of the present application, the spacing between the nozzle 31 and the nozzle 41 is adjustable.
Specifically, the spacing between two adjacent receiving holes 22 on different target substrates 2 may be different according to the requirement of the design specification. Therefore, in order to satisfy the variety of applications, before the ink 1 is sprayed, the spacing between the nozzle 31 and the nozzle 41 may be adjusted so as to accommodate the spacing between the adjacent two receiving holes 22 on the target substrate 2 to be sprayed.
In one embodiment of the present application, the inkjet printing apparatus may further include a direction guide assembly, and the direction guide assembly may include a guide rail. Here, the inkjet module 3 may slide along the guide rail and may be fixed.
Specifically, the inkjet module 3 may be disposed on a guide rail, and the inkjet module 3 may be slidable along the guide rail and fixable, thereby making the interval between the nozzle 31 and the emission nozzle 41 adjustable. Here, the heating assembly 4 may be fixed in position on the inkjet printing apparatus, or may be adjustable in position, and the embodiment of the present application is not limited to whether the heating assembly 4 is fixed in position.
Alternatively, in another embodiment of the present application, the heating unit 4 may be slidable along the above-mentioned guide rail and may be fixed.
Specifically, the heating assembly 4 may be disposed on a guide rail, and the heating assembly 4 may be slidable along the guide rail and may be fixed, thereby making the interval between the nozzle 31 and the injection nozzle 41 adjustable. Here, the inkjet assembly 3 may be fixed in position or adjustable in position on the inkjet printing apparatus, and the embodiment of the present application is not limited to whether the inkjet assembly 3 is fixed in position.
Alternatively, in another embodiment of the present application, the heating module 4 and the ink jet module 3 may both slide along the above-described guide rail and may be fixed.
Specifically, the heating assembly 4 and the ink jet assembly 3 may both be disposed on a guide rail, and the heating assembly 4 and the ink jet assembly 3 may both slide along the guide rail and be fixed, thereby also making the spacing between the nozzle 31 and the nozzle 41 adjustable.
Fig. 3 is a schematic structural view of an inkjet printing apparatus according to another embodiment of the present application.
In the embodiment of the present application, the ink jetting module 3 and one heating module 4 may constitute one ink jetting heating set 5. To speed up the rate of inkjet printing, in one embodiment of the present application, the inkjet printing apparatus may include multiple inkjet heating sets 5. For example, as shown in fig. 3, the inkjet printing apparatus may include three inkjet heating groups 5.
Specifically, the ink jetting modules 3 and the heating modules 4 of the multiple ink jetting heating groups 5 may be arranged in one row, as shown in fig. 3, or in multiple rows. When the ink jetting assemblies 3 and the heating assemblies 4 of the multiple ink jetting heating sets 5 are arranged in a row, the multiple ink jetting heating sets 5 can simultaneously spray the ink 1 to a row of the receiving holes 22 and heat the ink, so as to accelerate the ink jetting printing speed of each row of the receiving holes 22. When the ink jet modules 3 and the heating modules 4 of the multiple groups of ink jet heating groups 5 are arranged in multiple rows, each group of ink jet heating groups 5 can spray ink 1 and heat one of the multiple rows of accommodating holes 22, and the multiple groups of ink jet heating groups 5 can move relative to the target substrate 2 at the same time, so that the ink jet printing speed of the multiple rows of accommodating holes 22 is increased.
In one embodiment of the present application, the heat source beam may include at least one of a laser beam, an infrared beam, an ultraviolet beam, and a visible beam.
For example, in the embodiment of the present application, the heat source beam emitted from the heating assembly 4 may be a laser beam, and the laser beam may be a gaussian beam, so that the energy density of the laser beam may decrease from the center to the periphery in the cross section of the laser beam.
Fig. 4 is a partial schematic structural view of a heating assembly 4 according to an embodiment of the present application.
In one embodiment of the present application, as shown in fig. 4, the heating assembly 4 may include a heat source generator 42, a continuous attenuation mirror 43, a beam expander 44, and a focusing mirror 45; wherein, the heat source 46 generated by the heat source generator 42 sequentially passes through the continuous attenuation mirror 43, the beam expanding mirror 44 and the focusing mirror 45 to form a heat source beam.
For example, when the heat source generator 42 is a laser, the heat source generator 42 may be a solid state laser 42, a fiber laser 42, or the like.
The continuous attenuation mirror 43 may continuously attenuate the energy of the heat source 46 so that the heat source beam emitted from the nozzle may have a suitable energy value. The appropriate energy value is an energy value suitable for heating the ink. For example, the continuous attenuation mirror 43 may include a constant value attenuation mirror, a polarizer, and the like. The beam expander 44 may expand the beam of the heat source 46 and reduce the divergence angle. The focusing mirror 45 may focus the heat source 46, and the heat source beam focused by the focusing mirror 45 may be emitted from the nozzle 41. Further, the focusing lens 45 of different focal lengths may be replaced according to the volume of the ink 1 in the accommodation hole 22. For example, the spot of the heat source 46 focused by the focusing mirror 45 may be 10 μm or less. The heat source 46 generated by the heat source generator 42 may be laser, ultraviolet light, visible light, infrared light, or the like. The wavelength of the heat source 46 is not limited in the embodiments of the present application. For example, when the heat source 46 is infrared light, the thermal effect of the heat source beam on the ink 1 will be more pronounced.
When the heat source beam is a laser beam and the accommodation hole 22 is a pixel hole, the energy density of the center of the laser generated by the heat source generator 42 may be 5J/cm or less2So as to be suitable for the formation of the organic light-emitting layer in the pixel hole.
The inkjet printing apparatus according to the embodiment of the present application is described above, and the inkjet printing method according to the embodiment of the present application is described below with reference to fig. 4 and 5.
FIG. 5 is a block diagram of an inkjet printing system according to one embodiment of the present application.
As shown in fig. 5, the inkjet printing system may include an inkjet printing apparatus and a controller 6. The inkjet printing apparatus may include an inkjet assembly 3 and a heating assembly 4, and the inkjet assembly 3 and the heating assembly 4 may be electrically connected to a controller 6, respectively, so as to enable the controller 6 to automatically control the inkjet assembly 3 and the heating assembly 4. Here, the controller 6 may be provided inside the inkjet printing apparatus, i.e., the controller 6 is a part of the inkjet printing apparatus; the controller 6 may also be provided outside the inkjet printing apparatus, i.e. the controller 6 and the inkjet printing apparatus are separate devices. The embodiment of the present application does not limit the manner of setting the controller 6.
FIG. 6 is a schematic flow chart diagram of a method of inkjet printing according to one embodiment of the present application.
As shown in fig. 6, the inkjet printing method may include the following steps, and the method may be executed by the controller 6.
At step 610, the nozzles 31 of the inkjet assembly 3 spray ink 1 onto the target substrate 2.
Specifically, the nozzle 31 may spray the ink 1 toward the receiving hole 22 of the target substrate 2.
At step 620, the inkjet assembly 3 and the heating assembly 4 are moved by a predetermined distance with respect to the target substrate 2 so that the ink 1 on the target substrate 2 is opposed to the emission nozzle 41 of the heating assembly 4.
Specifically, the inkjet assembly 3 and the heating assembly 4 may be moved simultaneously relative to the target substrate 2. When the target substrate 2 has a plurality of receiving holes 22, the predetermined distance may be a distance between two adjacent receiving holes 22.
In step 630, the emission nozzle 41 emits a heat source beam toward the ink 1 on the target substrate 2, wherein the energy density of the heat source beam decreases from the center to the periphery.
For other details of the inkjet printing method, reference may be made to the above-mentioned embodiment of the inkjet printing apparatus, and details are not repeated here to avoid repetition.
In the embodiment of the present application, since the energy density of the heat source beam decreases from the center to the periphery in the cross section of the heat source beam, the solidification speed of the center region of the ink 1 in the accommodation hole 22 is increased to a higher degree than that of the edge region, and thus the ink 1 flowing from the center region to the edge region can be reduced. That is, the situation that the ink 1 in the middle area flows to the upper side of the edge area can be relieved, and the problem of uneven thickness of the film layer prepared by the ink jet printing technology is effectively solved.
In one embodiment of the present application, the nozzles 31 of the inkjet assembly 3 may spray another ink 1 toward the target substrate 2 when performing step 630.
Specifically, the spraying of the ink 1 and the heating of the ink 1 may be performed simultaneously, thereby accelerating the rate of inkjet printing.
In one embodiment of the present application, the spraying of another ink 1 onto the target substrate 2 by the nozzle 31 of the inkjet assembly 3 while the heat source beam is emitted by the emission nozzle 41 toward the ink 1 on the target substrate 2 includes: after sending the firing command to the firing nozzle 41 of the heating unit 4, a spraying command is continuously sent to the nozzle 31 of the ink jet unit 3 so that the nozzle 31 sprays another ink 1 onto the target substrate 2 while the heat source beam heats the ink 1 on the target substrate 2.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modifications, equivalents and the like that are within the spirit and principle of the present application should be included in the scope of the present application.
Claims (9)
1. An inkjet printing apparatus, comprising:
an inkjet assembly including a nozzle to spray ink toward a plurality of receiving holes of a target substrate; and
a heating assembly including an emission nozzle emitting a heat source beam;
wherein the heat source beam is used for heating the sprayed ink, the energy density of the heat source beam is decreased from the center to the periphery on the cross section of the heat source beam,
when the nozzle sprays a plurality of the inks to the target substrate, the nozzle moves relative to the target substrate along the formation tracks of the plurality of the inks, and
the pitch between the emission nozzle and the nozzle is an integral multiple of the pitch between the accommodation holes adjacent in the track direction.
2. Inkjet printing apparatus according to claim 1 further comprising a drive assembly configured to drive movement of the nozzle and the firing nozzle simultaneously.
3. Inkjet printing apparatus according to claim 2 wherein the spacing between the nozzle and the firing nozzle is adjustable.
4. Inkjet printing apparatus according to claim 3 further comprising a directional guide assembly including a guide rail;
the ink jet assembly slides along the guide rail and can be fixed;
and/or the heating assembly slides along the guide rail and can be fixed.
5. Inkjet printing apparatus according to any of claims 1 to 4 wherein the heat source beam comprises at least one of a laser beam, an infrared beam, an ultraviolet beam and a visible beam.
6. Inkjet printing apparatus according to claim 5 wherein the heating assembly further comprises a heat source generator, a continuous attenuation mirror, a beam expander mirror, and a focusing mirror;
and the heat source generated by the heat source generator sequentially passes through the continuous attenuating lens, the beam expanding lens and the focusing lens to form the heat source beam.
7. A method of inkjet printing, comprising:
the nozzle of the ink jet assembly sprays ink to a plurality of accommodating holes of the target substrate;
the ink jet assembly and the heating assembly move relative to the target substrate for a preset distance so that the ink on the target substrate is opposite to the emission nozzle of the heating assembly; and
the emission nozzle emits a heat source beam to the ink on the target substrate, wherein the energy density of the heat source beam is decreased from the center to the periphery;
wherein when the nozzle sprays a plurality of the inks toward the target substrate, the nozzle moves relative to the target substrate along a formation trajectory of the plurality of the inks, and
the preset distance is an integral multiple of a space between adjacent accommodating holes in the track direction.
8. The method of inkjet printing according to claim 7 wherein the nozzles of the inkjet assembly spray another ink toward the target substrate while the firing nozzles are firing the heat source beam toward the ink on the target substrate.
9. The method of inkjet printing according to claim 8 wherein said spraying another ink onto the target substrate by the nozzles of the inkjet assembly while the nozzles are emitting the heat source beam toward the ink on the target substrate comprises:
after sending a firing command to the firing nozzle of the heating assembly, continuously sending a spray command to the nozzle of the inkjet assembly so that the nozzle sprays the other ink to the target substrate while the heat source beam heats the ink on the target substrate.
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