CN111137013A - Inkjet printing method, inkjet printing apparatus, inkjet printing device, and computer-readable storage medium - Google Patents
Inkjet printing method, inkjet printing apparatus, inkjet printing device, and computer-readable storage medium Download PDFInfo
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- CN111137013A CN111137013A CN202010021001.XA CN202010021001A CN111137013A CN 111137013 A CN111137013 A CN 111137013A CN 202010021001 A CN202010021001 A CN 202010021001A CN 111137013 A CN111137013 A CN 111137013A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/07—Ink jet characterised by jet control
- B41J2/11—Ink jet characterised by jet control for ink spray
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/12—Digital output to print unit, e.g. line printer, chain printer
- G06F3/1201—Dedicated interfaces to print systems
- G06F3/1202—Dedicated interfaces to print systems specifically adapted to achieve a particular effect
- G06F3/1218—Reducing or saving of used resources, e.g. avoiding waste of consumables or improving usage of hardware resources
Abstract
The invention discloses an ink-jet printing method, an ink-jet printing device, ink-jet printing equipment and a computer-readable storage medium. The method is applied to an organic light-emitting device film and comprises the following steps: acquiring the current position of a printing head of an ink-jet printer; and adjusting the moving distance of the printing head of the ink-jet printer according to the current position. The ink-jet printing method can control the thickness of the film surface by adjusting the moving distance of the printing head of the ink-jet printer, thereby preventing the problem of uneven film surface thickness caused by capillary flow and Marangoni effect. Compared with the existing method for controlling the thickness of the film surface by adjusting the type and the proportion of the solvent, the ink-jet printing method has low cost and can avoid the influence of additives on the performance of devices.
Description
Technical Field
The invention relates to the technical field of ink-jet printing, in particular to an ink-jet printing method, an ink-jet printing device, ink-jet printing equipment and a computer readable storage medium.
Background
At present, the OLED display device mainly adopts a vacuum semiconductor technology to prepare a high-quality organic film. But the technology is difficult to realize the uniform preparation of OLED panels with the size of 55 inches. Meanwhile, the lower material utilization rate and the higher cost of the OLED are bottlenecks which restrict the large-scale development of the OLED. The ink-jet printing is used as a non-contact printing technology, has the advantages of high material utilization rate, suitability for flexible processing, capability of realizing patterned processing without a mask plate and the like, and becomes a film-forming technology which has the most potential for processing and preparing large-area flexible OLED display screens.
When the OLED light-emitting panel is prepared by adopting an ink-jet printing process, the lighting effect (brightness uniformity, service life, efficiency and the like) of the device is seriously influenced by the film-forming quality. The "coffee ring" effect is a common phenomenon in ink jet printing processes, which can lead to uneven deposition of functional materials, reduce the resolution of the printed pattern, and impair the performance of the functional device produced. The 'coffee ring' effect is mainly formed by three-phase contact line pinning, the volatilization rate of the edge of the spherical crown-shaped liquid drop is high, the solution is supplemented from the middle to the edge, solute particles (quantum dots) are brought to the edge to be deposited, and finally the 'coffee ring' is formed. FIG. 1 is a schematic diagram illustrating an example of a principle of an ink droplet film forming process. As shown in fig. 1, when an ink droplet is dropped into a substrate or a pixel, the evaporation rate of the central portion having a relatively small volume and unit area in the ink droplet is different from that of the edge portion having a relatively large volume and unit area due to the shape of the ink droplet, that is, due to the formation of the surface tension variation curve, and thus, the drying rate of the ink in the edge portion is faster. The solid content distribution of the central part and the solid content distribution of the edge part are different along with the continuous volatilization of the solvent of the edge part, so that a concentration gradient difference exists, and a capillary compensation flowing phenomenon of the solvent from the central part to the edge part is caused, the flowing of the solvent tends to drive part of solute to migrate to the edge part, the solute quantity of the edge part is increased continuously, and finally, a coffee ring effect is formed.
In addition, the marangoni effect is a common phenomenon in ink jet printing processes. The marangoni effect is caused by the fact that liquid with large surface tension has strong tensile force on liquid with small surface tension around the liquid, and surface tension gradient is generated; the liquid is caused to flow from a low surface tension to a high tension. FIG. 2 is a schematic diagram illustrating an example of a principle of an ink droplet film forming process. As shown in fig. 2, marangoni flow occurs due to the tension gradient across the membrane face, migrating solutes from the edges to the middle region, resulting in a membrane face that is "thick in the middle, thin at both ends".
In order to solve the above problems, the existing solutions include adding components into the solvent to control the volatilization speed of the solvent, adjusting the kind and ratio of the solvent to control the surface tension of the solvent, and the like. In general, the above method can function to a certain extent to uniform film thickness. However, in the case of OLEDs, additives such as surfactants tend to degrade device performance and are therefore difficult to use in OLED structures. Meanwhile, the method has high printing cost and is not suitable for the production of large-size panels. In addition, the above method requires re-adjustment of the formulation when different inks are selected.
Therefore, on the premise of ensuring the device performance, how to adopt the inkjet printing technology to prepare the highly uniform and highly precise OLED product becomes a key point for the technical problem to be solved and the research of the skilled person all the time.
Disclosure of Invention
In view of this, embodiments of the present invention provide an inkjet printing method, apparatus, device, and computer readable storage medium to solve the problems in the prior art that the thickness of a printed organic light emitting device film is not uniform and the device performance is degraded due to capillary flow and marangoni effect.
Therefore, the embodiment of the invention provides the following technical scheme:
in a first aspect of the present invention, there is provided an inkjet printing method comprising:
acquiring the current position of a printing head of an ink-jet printer;
and adjusting the moving distance of the printing head of the ink-jet printer according to the current position.
Further, adjusting the moving distance of the print head of the inkjet printer according to the current position includes:
acquiring the thickness of the central part and the thickness of the edge part of a first organic light-emitting device thin film printed by the printing head of the ink-jet printer by adopting the same moving distance;
comparing the thickness of the central part with the thickness of the edge part to obtain a comparison result;
and adjusting the moving distance according to the comparison result.
Further, according to the comparison result, adjusting the moving distance includes:
when the thickness of the central part is larger than that of the edge part, the moving distance is adjusted to be smaller when the current position is farther away from the central position of the organic light-emitting device film; alternatively, the first and second electrodes may be,
when the thickness of the central part is smaller than that of the edge part, the moving distance is adjusted to be larger as the current position is farther away from the central position of the organic light-emitting device thin film.
Further, when the thickness of the central portion is greater than that of the edge portion, the moving distance satisfies the following formula:
yn＝y1-(n-1)Δy；
the moving distance from the current position to the center position of the organic light-emitting device film from far to near is as follows: y is1、y2……ynN is an integer greater than 1; Δ y is a first preset value;
y is more than or equal to 0.4 and less than or equal to 1.6; l is the film width of the organic light-emitting device, and y is the same moving distance.
Further, when the thickness of the central portion is smaller than that of the edge portion, the following formula is satisfied:
yn＝y1+(n-1)Δy；
the moving distance from the current position to the center position of the organic light-emitting device film from far to near is as follows: y is1、y2……ynN is an integer greater than 1; Δ y is a second preset value;
y is more than or equal to 0.4 and less than or equal to 1.6; l is the film width of the organic light-emitting device, and y is the same moving distance.
In a second aspect of the present invention, there is provided an inkjet printing apparatus comprising:
the acquisition module is used for acquiring the current position of the printing head of the ink-jet printer;
and the adjusting module is used for adjusting the moving distance of the printing head of the ink-jet printer according to the current position.
Further, the adjusting module further comprises:
the acquiring unit is used for acquiring the thickness of the central part and the thickness of the edge part of the first organic light-emitting device thin film printed by the printing head of the ink-jet printer by adopting the same moving distance;
the comparison unit is used for comparing the thickness of the central part with the thickness of the edge part to obtain a comparison result;
and the adjusting unit is used for adjusting the moving distance according to the comparison result.
Further, the adjusting unit is further configured to:
when the thickness of the central part is larger than that of the edge part, the moving distance is adjusted to be smaller when the current position is farther away from the central position of the organic light-emitting device film; alternatively, the first and second electrodes may be,
when the thickness of the central part is smaller than that of the edge part, the moving distance is adjusted to be larger when the current position is farther away from the central position of the organic light-emitting device thin film.
A third aspect of the present invention provides an inkjet printing apparatus comprising:
at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the one processor, the instructions being executable by the at least one processor to cause the at least one processor to perform the method of inkjet printing according to the first aspect.
A fourth aspect of the present invention provides a computer readable storage medium having computer instructions stored thereon, wherein the instructions, when executed by a processor, implement the steps of the inkjet printing method according to the first aspect.
The technical scheme of the embodiment of the invention has the following advantages:
the embodiment of the invention provides an ink-jet printing method, which is applied to an organic light-emitting device film. The method has the function of controlling the film surface thickness by adjusting the moving distance of the printing head of the ink-jet printer. According to the ink-jet printing method in the embodiment of the invention, the moving distance is adjusted according to the thickness of the central part and the thickness of the edge part of the film printed by adopting the same moving distance, so that the problem of uneven film surface thickness caused by capillary flow and Marangoni effect can be prevented. Compared with the existing method for controlling the thickness of the membrane surface by adjusting the type and the proportion of the solvent, the ink-jet printing method in the embodiment of the invention has low cost and can avoid the influence of additives on the performance of devices.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of an embodiment of an ink droplet deposition process.
FIG. 2 is a schematic diagram of an ink droplet film forming process according to another embodiment.
FIG. 3 is a flow chart of a method of inkjet printing according to an embodiment of the present invention.
FIG. 4 is a flow chart of another method of inkjet printing according to an embodiment of the present invention.
Fig. 5 is a schematic view showing a change in film surface in the inkjet printing method according to the embodiment of the present invention.
Fig. 6 is a schematic view showing a change in film surface in the inkjet printing method according to the embodiment of the present invention.
Fig. 7 is a structural view of an inkjet printing apparatus according to an embodiment of the present invention.
Detailed Description
The technical solutions of an inkjet printing method, an inkjet printing apparatus, an inkjet printing device, and a computer-readable storage medium according to the embodiments of the present application will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments of the present application. 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.
In the description of the present application, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be considered as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In this application, the word "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the application. In the following description, details are set forth for the purpose of explanation. It will be apparent to one of ordinary skill in the art that the present application may be practiced without these specific details. In other instances, well-known structures and processes are not set forth in detail in order to avoid obscuring the description of the present application with unnecessary detail. Thus, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.
When the OLED light-emitting panel is prepared by adopting an ink-jet printing process, factors such as capillary flow, the Marangoni effect and the like can influence the uniformity of film formation. FIG. 1 is a schematic diagram of an embodiment of an ink droplet deposition process. As shown in fig. 1, during the ink-jet printing process, the volatile gas field on the surface of the liquid drop film is not uniform, and capillary flow exists inside the deposited ink, and the flow migrates the solute in the middle of the liquid drop to the edge, so that the coffee ring effect is generated. When the film is formed, the film surface has the condition of thin middle and thick two ends, and the uniformity of the film is poor. FIG. 2 is a schematic diagram of an ink droplet film forming process according to another embodiment. As shown in fig. 2, during inkjet printing, due to the presence of a surface tension gradient on the film surface, marangoni flow occurs, which causes solute to migrate from the edge to the middle region. When the film is formed, the film surface may be "thick in the middle and thin at both ends". The existing methods for improving the uniformity of film formation have one or more of the following problems: high cost, low efficiency, little influence on the performance of the device and small application range. The embodiment of the invention provides an ink-jet printing method which is applied to an organic light-emitting device film. The ink-jet printing method can be used for preparing display screens of products with display functions, such as liquid crystal televisions, mobile phones, digital cameras, tablet computers, electronic paper, navigators and the like. FIG. 3 is a flow chart of a method of inkjet printing according to an embodiment of the present invention. As shown in fig. 3, the specific flow of the inkjet printing method may be as follows:
s31: the current position of the print head of the ink jet printer is acquired.
In this embodiment, the current position of the print head of the inkjet printer is the position of the print head of the inkjet printer relative to the print area. The specific acquisition method of the current position can be set according to specific situations. For example, the corresponding printing area is determined according to the organic light emitting device thin film to be printed. The printing process of the ink-jet printer is as follows: and printing the leftmost column of the area by the printing head, moving the printing head to the right, printing the next column, and repeating the steps to form the organic light-emitting device film. The current position is a position in the print area corresponding to the current print column. The current position of the print head of the inkjet printer can be obtained in other ways known in the art by those skilled in the art from the description of the embodiment.
In one specific embodiment, the printing process of the inkjet printer is: and determining a corresponding printing area according to the organic light-emitting device thin film to be printed, and representing the area by using x-axis and y-axis coordinates. The print head moves in the x-axis direction and the print table moves in the y-axis direction. The current position is represented by coordinates of the x-axis and the y-axis.
The ink jet printer used in the embodiment of the present invention may be provided with heads having one row of nozzles, heads having a plurality of rows of nozzles, heads having adjacent rows of nozzles staggered by a predetermined pitch, or other heads having the same characteristics.
S32: and adjusting the moving distance of the printing head of the ink-jet printer according to the current position.
In this embodiment, the moving distance of the print head of the inkjet printer is a relative moving distance between the print head of the inkjet printer and the print stage of the inkjet printer, where the print head of the inkjet printer continuously ejects ink twice.
In one embodiment, the printing process of the inkjet printer is that the printing head prints the leftmost column of the area, then moves to the right and prints the next column, and so on, to form the organic light emitting device thin film. The moving distance is the moving distance of the printing head for printing two adjacent columns.
In one specific embodiment, the printing process of the inkjet printer is: the printhead prints the leftmost column of the area first. The print table then moves to the right and the print head prints the next column again. Repeating the steps to form the organic light-emitting device film. The moving distance is the moving distance of the printing table corresponding to two adjacent rows of the printing heads. The printing table may be replaced by a substrate, which is not limited in this application.
Compared with the traditional ink-jet printing method, the method has the advantages that the current position of the printing head of the ink-jet printer is obtained, and the moving distance of the printing head of the ink-jet printer is adjusted according to the current position. The method has the function of controlling the distance of ink drops by adjusting the moving distance of the printing head of the ink-jet printer, thereby controlling the thickness of the film surface. Compared with the ink-jet printing method with fixed moving distance in the prior art, the ink-jet printing method provided by the embodiment of the invention can flexibly control the thickness of different positions of the film surface according to actual requirements, and further prepares a film with uniform thickness or a film with variable thickness.
FIG. 4 is a flow chart of another method of inkjet printing according to an embodiment of the present invention. As shown in fig. 4, the specific flow of the inkjet printing method may be as follows:
s41: the thickness of the center portion and the thickness of the edge portion of the first organic light emitting device thin film printed by the print head of the ink jet printer using the same moving distance are obtained.
In this embodiment, the same moving distance is a relative moving distance between the print head of the inkjet printer and the print table of the inkjet printer corresponding to two consecutive times of ink jetting by the print head of the inkjet printer.
In one embodiment, the printing process of the inkjet printer is that the printing head prints the leftmost column of the area, then moves to the right and prints the next column, and so on, to form the organic light emitting device thin film. The same moving distance is the moving distance of the printing head for printing two adjacent columns.
In one specific embodiment, the printing process of the inkjet printer is: the printhead prints the leftmost column of the area first. The print table then moves to the right and the print head prints the next column again. Repeating the steps to form the organic light-emitting device film. The same moving distance is the moving distance of the printing table corresponding to two adjacent rows printed by the printing head. The printing table may be replaced by a substrate, which is not limited in this application.
The same moving distance can be set according to specific situations. For example, according to the ink droplet size, the ink density, and the composition ratio of the ink. Continuous printing with the same moving distance enables formation of a thin film.
In this embodiment, the thickness of the central portion and the thickness of the edge portion may be selected to be specific values or may be a range of values.
S42: and comparing the thickness of the central part with that of the edge part to obtain a comparison result.
In this embodiment, the comparison result includes that the thickness of the central portion is greater than, equal to, or less than the thickness of the edge portion. In one embodiment, the comparison includes a difference between the thickness of the central portion and the thickness of the edge portion.
S43: the current position of the print head of the ink jet printer is acquired.
In this embodiment, the current position of the print head of the inkjet printer is the position of the print head of the inkjet printer relative to the print area. The specific acquisition method of the current position can be set according to specific situations. For example, the corresponding printing area is determined according to the organic light emitting device thin film to be printed. The printing process of the ink-jet printer is as follows: and printing the leftmost column of the area by the printing head, moving the printing head to the right, printing the next column, and repeating the steps to form the organic light-emitting device film. The current position is a position in the print area corresponding to the current print column.
S44: and adjusting the moving distance of the printing head of the ink-jet printer according to the current position and the comparison result.
In this embodiment, the moving distance of the print head of the inkjet printer is a relative moving distance between the print head of the inkjet printer and the print stage of the inkjet printer, where the print head of the inkjet printer continuously ejects ink twice.
In one embodiment, the printing process of the inkjet printer is that the printing head prints the leftmost column of the area, then moves to the right and prints the next column, and so on, to form the organic light emitting device thin film. The moving distance is the moving distance of the printing head for printing two adjacent columns.
In one specific embodiment, the printing process of the inkjet printer is: the printhead prints the leftmost column of the area first. The print table then moves to the right and the print head prints the next column again. Repeating the steps to form the organic light-emitting device film. The moving distance is the moving distance of the printing table corresponding to two adjacent rows of the printing heads. The printing table may be replaced by a substrate, which is not limited in this application.
In one embodiment, adjusting the movement distance according to the comparison result includes: when the thickness of the central portion is larger than that of the edge portion, the adjustment moving distance is smaller as the current position is farther from the central position of the thin film of the organic light emitting device. When the thickness of the central portion is smaller than that of the edge portion, the adjustment moving distance is larger as the current position is farther from the central position of the thin film of the organic light emitting device. The moving distance is fixed when the thickness of the central portion is equal to the thickness of the edge portion.
In this embodiment, the variation range of the moving distance may be set according to specific situations. For example, according to the ink droplet size, the ink density, and the composition ratio of the ink. Continuous printing using this moving distance enables formation of a thin film. The increase or decrease of the adjacent moving distance is preferably a fixed value. The magnitude of the moving distance is preferably symmetrical with respect to the center line of the thin film of the organic light emitting device.
In contrast to the prior art, the present application provides an inkjet printing method. Aiming at two common problems of uneven film surface thickness caused by capillary flow and the Marangoni effect, the method increases the thickness of the central part and the thickness of the edge part of the first organic light-emitting device thin film printed by the same moving distance. Which kind of problem exists can be determined by comparing the above-described thickness of the central portion and the thickness of the edge portion. Further, the moving distance is adjusted in a targeted manner, and the uniformity of film formation is improved. Compared with the prior art that the evaporation speed of the solvent is controlled by adding components into the solvent, the surface tension of the solvent is controlled by adjusting the type of the solvent and the proportion, so that the uniformity of film formation is improved, the embodiment can avoid the reduction of device performance caused by changing ink components. Compared with the prior art, the method controls the volatilization speed of the solvent by controlling the temperature, so that the influence of the temperature on the performance of the device can be avoided, and the effect of adjusting the thickness of the film surface is better.
In a specific embodiment, when the thickness of the central portion is greater than that of the edge portion, the adjustment moving distance is smaller as the current position is farther from the central position of the thin film of the organic light emitting device. Alternatively, when the thickness of the central portion is smaller than that of the edge portion, the adjustment moving distance is larger as the current position is farther from the central position of the organic light emitting device thin film. This example is a solution to the problem of non-uniformity of the membrane surface in both of fig. 1 and 2.
Fig. 5 is a schematic view showing a change in film surface in the inkjet printing method according to the embodiment of the present invention. As shown in fig. 5, in a specific embodiment, when the thickness of the central portion is greater than that of the edge portion, the moving distance is calculated by the formula:
yn＝y1-(n-1)Δy；
the moving distance from the current position to the center position of the organic light-emitting device film from far to near is as follows: y is1、y2……ynN is an integer greater than 1; Δ y is a first preset value;
y is more than or equal to 0.4 and less than or equal to 1.6; l is the width of the organic light-emitting device film, and y is the same moving distance.
In this embodiment, the value of n may be set according to specific situations. For example, the corresponding printing area is determined according to the organic light emitting device thin film to be printed. The printing process of the ink-jet printer is as follows: and printing the leftmost column of the area by the printing head, moving the printing head to the right, printing the next column, and repeating the steps to form the organic light-emitting device film. The number of movements of the print head is 30, n is half the number of movements of the print head, and n is 15.
In the embodiment, the value ranges of y and delta y satisfy,
y is more than or equal to 0.4 and less than or equal to 1.6. It is possible to prevent the film formation from being insufficient for continuous printing due to an excessively large moving pitch. The uniformity of the film surface can be effectively improved on the premise of ensuring the continuous printing to form a film through the uniformly-changed moving distance.
Fig. 6 is a schematic view showing a change in film surface in the inkjet printing method according to the embodiment of the present invention. In one specific embodiment, as shown in fig. 6, when the thickness of the central portion is smaller than that of the edge portion, the moving distance is calculated by the formula:
yn＝y1+(n-1)Δy；
the moving distance from the current position to the center position of the organic light-emitting device film from far to near is as follows: y is1、y2……ynN is an integer greater than 1; Δ y is a second preset value;
y is more than or equal to 0.4 and less than or equal to 1.6; l is the width of the organic light-emitting device film, and y is the same moving distance.
In this embodiment, the value of n may be set according to specific situations. For example, the corresponding printing area is determined according to the organic light emitting device thin film to be printed. The printing process of the ink-jet printer is as follows: and printing the leftmost column of the area by the printing head, moving the printing head to the right, printing the next column, and repeating the steps to form the organic light-emitting device film. The number of movements of the print head is 31, n is half the number of movements of the print head rounded up, and n is 16.
In the embodiment, the value ranges of y and delta y satisfy,
y is more than or equal to 0.4 and less than or equal to 1.6. It is possible to prevent the film formation from being insufficient for continuous printing due to an excessively large moving pitch. The uniformity of the film surface can be effectively improved on the premise of ensuring the continuous printing to form a film through the uniformly-changed moving distance.
The embodiment of the present invention further provides an inkjet printing apparatus, which is used to implement the above embodiments and preferred embodiments, and the description of the apparatus is omitted. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.
The present embodiment provides an inkjet printing apparatus, as shown in fig. 7, including an obtaining module 71, configured to obtain a current position of a print head of an inkjet printer; and the adjusting module 72 is configured to adjust a moving distance of the print head of the inkjet printer according to the current position.
In a specific embodiment, the adjusting module 72 further includes: the device comprises an acquisition unit, a control unit and a display unit, wherein the acquisition unit is used for acquiring the thickness of the central part and the thickness of the edge part of a first organic light-emitting device thin film printed by a printing head of an ink-jet printing machine platform by adopting the same moving distance; the comparison unit is used for comparing the thickness of the central part with the thickness of the edge part to obtain a comparison result; and the adjusting unit is used for adjusting the moving distance according to the comparison result.
In a specific embodiment, the adjusting unit is further configured to: when the thickness of the central part is larger than that of the edge part, the moving distance is adjusted to be smaller when the current position is farther away from the central position of the organic light-emitting device film; or, when the thickness of the central part is smaller than that of the edge part, the moving distance is adjusted to be larger when the current position is farther from the central position of the organic light-emitting device thin film.
Further functional descriptions of the modules are the same as those of the corresponding embodiments, and are not repeated herein.
Embodiments of the present invention further provide a non-transitory computer storage medium, where the computer storage medium stores computer-executable instructions, and the computer-executable instructions may execute the inkjet printing method in any of the above method embodiments. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard disk (Hard disk Drive, abbreviated as HDD), a Solid State Drive (SSD), or the like; the storage medium may also comprise a combination of memories of the kind described above.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (10)
1. An ink-jet printing method applied to an organic light-emitting device film, comprising:
acquiring the current position of a printing head of an ink-jet printer;
and adjusting the moving distance of the printing head of the ink-jet printer according to the current position.
2. The method of inkjet printing according to claim 1 wherein adjusting the distance of movement of the inkjet printer printhead according to the current position comprises:
acquiring the thickness of the central part and the thickness of the edge part of a first organic light-emitting device thin film printed by the printing head of the ink-jet printer by adopting the same moving distance;
comparing the thickness of the central part with the thickness of the edge part to obtain a comparison result;
and adjusting the moving distance according to the comparison result.
3. The inkjet printing method of claim 2, wherein adjusting the movement distance based on the comparison comprises:
when the thickness of the central part is larger than that of the edge part, the moving distance is adjusted to be smaller when the current position is farther away from the central position of the organic light-emitting device film; alternatively, the first and second electrodes may be,
when the thickness of the central part is smaller than that of the edge part, the moving distance is adjusted to be larger as the current position is farther away from the central position of the organic light-emitting device thin film.
4. A method of inkjet printing according to claim 3 wherein the distance of travel when the thickness of the central portion is greater than the thickness of the edge portion conforms to the following equation:
yn＝y1-(n-1)Δy；
the moving distance from the current position to the center position of the organic light-emitting device film from far to near is as follows: y is1、y2……ynN is an integer greater than 1; Δ y is a first preset value;
y is more than or equal to 0.4 and less than or equal to 1.6; l is the film width of the organic light-emitting device, and y is the same moving distance.
5. The method of inkjet printing according to claim 3 wherein the travel distance when the center portion thickness is less than the edge portion thickness conforms to the following equation:
yn＝y1+(n-1)Δy；
the moving distance from the current position to the center position of the organic light-emitting device film from far to near is as follows: y is1、y2……ynN is an integer greater than 1; Δ y is a second preset value;
y is more than or equal to 0.4 and less than or equal to 1.6; l is the film width of the organic light-emitting device, and y is the same moving distance.
6. An inkjet printing apparatus, comprising:
the acquisition module is used for acquiring the current position of the printing head of the ink-jet printer;
and the adjusting module is used for adjusting the moving distance of the printing head of the ink-jet printer according to the current position.
7. Inkjet printing apparatus according to claim 6 wherein the adjustment module further comprises:
the acquiring unit is used for acquiring the thickness of the central part and the thickness of the edge part of the first organic light-emitting device thin film printed by the printing head of the ink-jet printer by adopting the same moving distance;
the comparison unit is used for comparing the thickness of the central part with the thickness of the edge part to obtain a comparison result;
and the adjusting unit is used for adjusting the moving distance according to the comparison result.
8. Inkjet printing apparatus according to claim 7, wherein the adjustment unit is further configured to:
when the thickness of the central part is larger than that of the edge part, the moving distance is adjusted to be smaller when the current position is farther away from the central position of the organic light-emitting device film; alternatively, the first and second electrodes may be,
when the thickness of the central part is smaller than that of the edge part, the moving distance is adjusted to be larger as the current position is farther away from the central position of the organic light-emitting device thin film.
9. An inkjet printing apparatus, comprising: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the one processor to cause the at least one processor to perform the method of inkjet printing according to any one of claims 1 to 5.
10. A computer readable storage medium having stored thereon computer instructions, which when executed by a processor, perform the steps of the inkjet printing method according to any one of claims 1 to 5.
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| PCT/CN2020/078527 WO2021138999A1 (en) | 2020-01-09 | 2020-03-10 | Ink-jet printing method, apparatus, device, and computer-readable storage medium |
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| WO2021138999A1 (en) | 2021-07-15 |
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