CN111216466B - Method and device for ink-jet printing and computer equipment - Google Patents
Method and device for ink-jet printing and computer equipment Download PDFInfo
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- CN111216466B CN111216466B CN201811404584.3A CN201811404584A CN111216466B CN 111216466 B CN111216466 B CN 111216466B CN 201811404584 A CN201811404584 A CN 201811404584A CN 111216466 B CN111216466 B CN 111216466B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
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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
Abstract
The application relates to a method, a device and a computer device for ink-jet printing, wherein the method comprises the following steps: acquiring linear relations between ink-jet voltages and ink-jet weights respectively corresponding to a plurality of ink-jet print heads; determining target ink jet voltage corresponding to each ink jet printing head according to the linear relation corresponding to each ink jet printing head and the target ink jet amount of each ink jet printing head; and printing according to the target ink jet voltage corresponding to each ink jet printing head. According to the method and the device, the linear relation between the ink jet voltage and the ink jet weight corresponding to the ink jet printing heads is obtained, so that the target ink jet voltage corresponding to each ink jet printing head is determined according to the linear relation corresponding to each ink jet printing head and the target ink jet amount of each ink jet printing head, each ink jet printing head prints under the corresponding target ink jet voltage, and large-area ink jet printing with good film thickness uniformity is achieved.
Description
Technical Field
The present application relates to the field of printing and film-making technologies, and in particular, to an inkjet printing method and apparatus, and a computer device.
Background
With the development of inkjet printing technology, inkjet printing technology has been widely applied to material coating in industrial production, especially large-area material coating, such as the fabrication of organic planarization layer of Thin Film Encapsulation (TFE), the coating of Polyimide (PI) flexible substrate, and the preparation of photoresist coating. Compared with the traditional spin coating technology and blade coating technology, the ink-jet printing technology has the advantages that the thickness of the coating film can be accurately controlled, materials are saved, the film layer can be freely patterned, and the like.
However, when a material is applied over a large area, it is common to increase the application efficiency by operating a plurality of ink jet print heads in different areas simultaneously. However, since each inkjet print head, even different nozzles of the same inkjet print head, may have different ink ejection amounts due to processing accuracy, operating conditions, time, and the like, the difference is particularly significant between different inkjet print heads, and thus, the simultaneous operation of a plurality of inkjet print heads may result in poor film thickness uniformity.
Disclosure of Invention
In view of the above, it is desirable to provide a method, an apparatus, and a computer device for large-area inkjet printing that can achieve good film thickness uniformity.
To achieve the above object, in one aspect, an embodiment of the present application provides a method of inkjet printing, including:
acquiring linear relations between ink-jet voltages and ink-jet weights respectively corresponding to a plurality of ink-jet print heads;
determining a target ink-jet voltage corresponding to each ink-jet printing head according to the linear relation corresponding to each ink-jet printing head and the target ink-jet amount of each ink-jet printing head;
and printing according to the target ink jet voltage corresponding to each ink jet printing head.
In one embodiment, the step of determining the target ink-jet voltage corresponding to each ink-jet print head according to the linear relationship corresponding to each ink-jet print head and the target ink-jet amount of each ink-jet print head includes: carrying out a plurality of groups on nozzles on the same ink jet printing head, wherein the number of the nozzles in each group is multiple, and acquiring the actual ink weight jetted by each group of nozzles under the target ink jet voltage; judging whether the actual ink weight sprayed by each grouped nozzle under the target ink-jet voltage meets a preset condition or not, and adjusting the overall ink-jet frequency of the grouped nozzles which do not meet the preset condition; and printing according to the adjusted overall ink jet frequency of each group of nozzles and the target ink jet voltage of the printing head.
In one embodiment, the preset condition comprises a first weight threshold range determined according to the target ink jetting amount of the ink jet printing head corresponding to each group of nozzles in a sharing mode, or a second weight threshold range determined according to the actual ink weight jetted by each group of nozzles under the same ink jet printing head;
judging whether the actual ink weight sprayed by each group of nozzles under the target ink-jet voltage meets a preset condition or not, and adjusting the overall ink-jet frequency of the group of nozzles which do not meet the preset condition, wherein the method comprises the following steps: and judging whether the actual ink weight sprayed by each grouped nozzle under the target ink spraying voltage meets a first weight threshold range or a second weight threshold range, and adjusting the overall ink spraying frequency of the grouped nozzles which do not meet the first weight threshold range or meet the second weight threshold range.
In one embodiment, the target ink ejection amount is determined based on the target coating film thickness and the target coating area.
In one embodiment, obtaining a linear relationship between the ink ejection voltage and the ink ejection weight corresponding to each of the plurality of ink jet print heads includes: detecting the weight of ink respectively ejected by at least two groups of voltage values of a plurality of ink-jet printing heads under a plurality of voltage conditions corresponding to the same waveform; and establishing a linear relation between the voltage and the ink weight of each ink jet printing head according to at least two groups of voltage values corresponding to the same waveform and the weight of the respectively ejected ink.
In one embodiment, determining the target ink-jet voltage for each ink-jet print head according to the linear relationship corresponding to each ink-jet print head and the target ink-jet amount of each ink-jet print head includes: according to the linear relation, first ink jet voltages respectively corresponding to the ink jet printing heads on the corresponding target ink jet amount and the linear relation are obtained; detecting the weight of first ink ejected by each ink jet printing head under the corresponding first ink jet voltage; if the first ink weight is within an allowable error range, the target ink jet voltage is a first ink jet voltage; and if the first ink weight is not in the allowable error range, acquiring second ink jet voltage corresponding to each ink jet printing head under the target ink jet amount according to the first ink weight of each ink jet printing head, the target ink jet amount and the linear relation, wherein the second ink jet voltage is the target ink jet voltage.
On the other hand, the embodiment of the present application further provides an inkjet printing apparatus, including: an acquisition module, a target ink ejection voltage determination module, and a printing module, wherein,
the acquisition module is used for acquiring linear relations between ink jet voltages and ink jet weights respectively corresponding to the plurality of ink jet printing heads;
The target ink jet voltage determining module is used for determining the target ink jet voltage corresponding to each ink jet printing head according to the linear relation corresponding to each ink jet printing head and the target ink jet amount of each ink jet printing head;
the printing module is used for printing according to the target ink jet voltage corresponding to each ink jet printing head.
In one embodiment, the device further comprises a detection module, a judgment module and an ink jet frequency adjustment module, wherein the detection module is used for grouping nozzles on the same ink jet printing head into a plurality of groups, acquiring the actual ink weight jetted by each group of nozzles under a target ink jet voltage, and the number of the nozzles in each group is a plurality; the judging module is used for judging whether the actual ink weight sprayed by each group of nozzles under the target ink-jet voltage meets a preset condition or not; the ink jet frequency adjusting module is used for adjusting the whole ink jet frequency of the grouped nozzles which do not meet the preset condition; the printing module is also used for printing according to the adjusted overall ink jet frequency of each group of nozzles and the target ink jet voltage of the printing head.
In one embodiment, the detection module comprises: the ink jet printing head comprises an electronic precision balance and an ink collecting tank arranged on the electronic precision balance, and the ink jet printing head moves to a position right above the ink collecting tank during operation.
In yet another aspect, an embodiment of the present application further provides a computer device, which includes a memory and a processor, where the memory stores a computer program, and the processor implements the steps of the method described above when executing the computer program.
According to the ink-jet printing method, the ink-jet printing device and the computer equipment, the linear relation between the ink-jet voltage and the ink-jet weight corresponding to the plurality of ink-jet printing heads is obtained, so that the target ink-jet voltage corresponding to each ink-jet printing head is determined according to the linear relation corresponding to each ink-jet printing head and the target ink-jet amount of each ink-jet printing head, each ink-jet printing head is enabled to print under the corresponding target ink-jet voltage, and large-area ink-jet printing with good film thickness uniformity is achieved.
Drawings
FIG. 1 is a schematic flow chart of a method of ink jet printing in one embodiment;
FIG. 2 is a schematic flow chart showing steps of obtaining linear relationships between ink ejection voltages and ink ejection weights respectively corresponding to a plurality of ink jet print heads according to an embodiment;
FIG. 3 is a schematic illustration of initial waveforms input to an inkjet printhead in one embodiment;
FIG. 4 is a flowchart illustrating a step of determining a target ink-jet voltage for each ink-jet print head according to a linear relationship corresponding to each ink-jet print head and a target ink-jet amount of each ink-jet print head in one embodiment;
FIG. 5 is a schematic flow chart diagram of a method of ink jet printing in another embodiment;
FIG. 6 is a schematic diagram illustrating adjustment of the ink ejection frequency of a nozzle in one embodiment;
FIG. 7 is a block diagram showing the structure of an ink jet printing apparatus according to an embodiment;
FIG. 8 is a block diagram showing the structure of an ink jet printing apparatus according to another embodiment;
FIG. 9 is a schematic diagram of the structure of a detection module in one embodiment;
FIG. 10 is a diagram showing an internal structure of a computer device according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
At present, in order to solve the problem of poor film thickness uniformity caused by simultaneous operation of a plurality of inkjet printing heads, the existing solution in the industry is to measure and calibrate the amount of ink ejected from all nozzles involved in printing before inkjet printing. One method is to capture an image of an air ink droplet by using a high-speed camera, thereby calculating the volume of the ink droplet; another method is to spray a drop of ink on a special film and then to take a photograph for analysis. However, both methods require measuring all the nozzles one by one, which takes a long time, thereby seriously affecting the production efficiency. Since the ink-jet voltage and the ink-jet amount are directly and positively correlated, the ink-jet voltage of each nozzle needs to be adjusted after measurement, and since the voltage of each nozzle may be different, each nozzle needs to be driven separately, so that each nozzle needs to be provided with a nozzle driving unit (DPN) separately to adjust the voltage, and the nozzle driving unit is expensive, which significantly increases the equipment cost. Thus, the long measurement time and expensive equipment cost prevent the application of inkjet printing technology to large area coating.
Based on the method, the application provides an ink-jet printing method, which can realize better film thickness uniformity under the conditions of shorter measuring time and lower equipment cost. As shown in fig. 1, the method comprises the steps of:
and 102, acquiring linear relations between ink jet voltages and ink jet weights respectively corresponding to a plurality of ink jet print heads.
Because a plurality of ink jet print heads are needed when large-area ink jet printing is carried out, the ink jet print heads of each specification have different ink jet weights due to the processing precision, the working conditions and the like of the ink jet print heads, and the ink jet weights and the ink jet voltages have positive correlation, in this embodiment, the linear relationship between the ink jet voltages and the ink jet weights respectively corresponding to the plurality of ink jet print heads participating in large-area printing can be obtained in advance through an experimental mode.
And step 104, determining a target ink jet voltage corresponding to each ink jet printing head according to the linear relation corresponding to each ink jet printing head and the target ink jet amount of each ink jet printing head.
In the present embodiment, the target ink ejection amount can be determined in accordance with the target coating film thickness and the target coating area. Therefore, after the target ink jet amount corresponding to each ink jet print head is determined, the target ink jet voltage corresponding to each ink jet print head can be determined according to the linear relation between the ink jet voltage and the ink weight of each ink jet print head obtained in the above steps, so that the ink jet voltage of each ink jet print head is adjusted to be the corresponding target ink jet voltage.
And 106, printing according to the target ink jet voltage corresponding to each ink jet printing head.
According to the method for ink-jet printing, the linear relation between the ink-jet voltage and the ink-jet weight corresponding to the ink-jet printing heads is obtained, so that the target ink-jet voltage corresponding to each ink-jet printing head is determined according to the linear relation corresponding to each ink-jet printing head and the target ink-jet amount of each ink-jet printing head, each ink-jet printing head is enabled to print under the corresponding target ink-jet voltage, and large-area ink-jet printing with good film thickness uniformity is achieved.
In an embodiment, as shown in fig. 2, the step 102 of obtaining a linear relationship between the ink jetting voltage and the ink jetting weight corresponding to each of the plurality of ink jet print heads may specifically include the following steps:
Where the waveform refers to an initial waveform input to each inkjet print head, as shown in fig. 3, the period of the waveform, and the width of the inkjet pulse therein, may be determined according to the ink used and the print head conditions. Since each specification of ink jet print head will have a recommended period and pulse width, and then fine-tuning is done according to the properties of the ink, if the ink viscosity is high, some pulse width is increased, and conversely, the pulse width is decreased.
In this embodiment, when there are a plurality of inkjet print heads, according to the determined initial waveforms input to the inkjet print heads, each inkjet print head is enabled to respectively eject ink under a plurality of voltage conditions corresponding to the same waveform by at least two sets of voltage values, so as to detect the weight of ink respectively ejected by each inkjet print head under at least two sets of voltage values corresponding to the same waveform. In this embodiment, in order to make the data more accurate, the high voltage U under the condition of a plurality of voltages corresponding to the same waveform may be selectedhighAnd low voltage UlowFor testing voltage values, thereby detecting a high voltage U corresponding to the same waveform for each ink jet print headhighAnd low voltage UlowWeight M of ink discharged from each of the ink chambershighAnd Mlow. Wherein, when measuring the weight of the ink, all the nozzles on the ink-jet printing head continuously eject 5000-highAnd a low voltage UlowInk droplets ejected from lower partThe numbers should be the same.
And step 204, establishing a linear relation between the ink-jet voltage and the ink weight of each ink-jet printing head according to at least two groups of voltage values corresponding to the same waveform and the ink weight respectively jetted.
In this embodiment, the high voltage U under several voltage conditions corresponding to the same waveform is selectedhighAnd low voltage UlowFor the purpose of testing voltage values, the high voltage U corresponding to the same waveform for each inkjet print head is usedhighAt the high voltage UhighWeight M of ink discharged downwardhighA first corresponding relation between the two and a low voltage U corresponding to the same waveformlowAt the low voltage UlowWeight M of ink discharged downwardlowThe second corresponding relationship between the ink jet voltage and the ink weight of each ink jet printing head can be established.
For example, assume a high voltage UhighAnd a low voltage UlowTake values of 70V and 50V respectively, so that the voltage at a specific high voltage U ishighAnd a low voltage UlowThe weight M of the ink ejected by each ink-jet printing head can be measuredhighAnd MlowThe value of (c). Through two pairs of Uhigh、MhighAnd UlowAnd MlowThe linear relationship between the two can be fitted, that is, M is a linear function of aU + b, where M is the ink weight, U is the ink ejection voltage, and a is>0，b<0。
According to the ink-jet printing method, the weight of the ink which is respectively sprayed by at least two groups of voltage values of each ink-jet printing head under the condition of a plurality of voltages corresponding to the same waveform is detected, so that the linear relation between the voltage corresponding to each ink-jet printing head and the weight of the ink is established, and the ink-jet voltage of each ink-jet printing head is adjusted in a targeted manner according to the target ink-jet amount and the linear relation of each ink-jet printing head, so that the uniformity of large-area ink-jet printing is better realized.
In an embodiment, as shown in fig. 4, in the step 104, determining the target ink-jet voltage corresponding to each ink-jet print head according to the linear relationship corresponding to each ink-jet print head and the target ink-jet amount of each ink-jet print head, specifically, the method may include the following steps:
In this embodiment, according to the determined linear relationship between the ink-jet voltage and the ink weight corresponding to each ink-jet print head, the first ink-jet voltage U corresponding to the target ink-jet amount in the corresponding linear relationship of each ink-jet print head can be calculated0. The target ink jet amount can be determined according to the target coating film thickness and the target coating area.
For example, assuming that an inkjet print head has 1024 nozzles and a nozzle pitch of 50um, a plurality of such inkjet print heads are used to simultaneously coat a film having a thickness of 10um on a substrate having a length of 100mm (assuming that the substrate width and the length of the inkjet print head in the nozzle direction are the same), and the ink drop pitch is 40um when printing. A target ink ejection amount M is appliedtargetCan be calculated by the following formula.
Mtarget(volume of single drop x number of drops ejected at the time of measurement x number of nozzles simultaneously participating in the measurement) ÷ ink density;
wherein, the first and the second end of the pipe are connected with each other,
the total volume of single-nozzle ink jet is equal to the nozzle pitch x the printing length x the coating film thickness;
substituting the data into the public to calculate the target ink jet quantity Mtarget(0.00002 × 5000 × 1024) ÷ ink density.
It should be noted that, in this embodiment, each measurement is performed on only one of the inkjet print heads, and the number of ink drops ejected from all nozzles of the inkjet print head at the same time should be the same.
In step 404, a first ink weight ejected by each inkjet print head under a corresponding first ink ejection voltage is detected.
Respectively determining the first ink jet print head according to the corresponding relationAn ink-jet voltage U0Then, each ink jet printing head is controlled to be at the corresponding first ink jet voltage U0Ink is ejected downwards, and the ink-jet printing heads are detected at a first ink-jet voltage U0The first ink weight of the lower ejection.
And step 410, acquiring second ink jet voltages corresponding to the ink jet print heads under the target ink jet amount according to the first ink weight, the target ink jet amount and the linear relation of the ink jet print heads, and taking the second ink jet voltages as the target ink jet voltages.
In this embodiment, the first ink-jet voltage U corresponding to each ink-jet print head is determined according to the first ink-jet voltage U corresponding to each ink-jet print head0At a first ink jet voltage U0The target ink ejection voltage is determined by the weight of the first ink actually ejected. Specifically, when each ink jet print head is at a first ink jet voltage U0The weight of the first ink ejected downwards is within an allowable error range, so that the first ink ejecting voltage U can be adjusted0As a target ink ejection voltage for the corresponding ink jet print head. Specifically, the error range may be determined according to the actual ink-jet precision requirement and the target ink-jet amount, and if the error range determined according to the actual ink-jet precision requirement is ± 5% of the target ink-jet amount, if the difference between the actually ejected first ink weight and the target ink-jet amount falls within the error range, it indicates that the ejected first ink weight is within the allowable error range, so that the first ink-jet voltage U may be adjusted0As a target ink ejection voltage for the corresponding ink jet print head. Otherwise, the weight of the ejected first ink is not in the allowable error range, so the first ink-jet voltage U corresponding to each ink-jet printing head is further determined0At a first ink jet voltage U0The weight of the first ink actually ejected and the target ink ejection amount MtargetAnd the linear relation is used for finely adjusting the ink-jet voltage of each ink-jet printing head so as to obtain a corresponding second ink-jet voltage, if the actual weight of the ink ejected under the second ink-jet voltage is full If the error range is satisfied, the second ink jet voltage is used as the target ink jet voltage U corresponding to the ink jet printing headtarget. Specifically, assuming that 3 inkjet print heads A, B and C were used in the coating process, the 3 inkjet print heads would be at the first ink jet voltage U0The weight of the first ink discharged from the lower part is M1、M2And M3. The fine adjustment of the ink ejection voltage of the 3 ink jet print heads is still based on the previously established relationship of M ═ aU + b, i.e., when M is1-Mtarget＝ΔM1Then, then Δ U1＝ΔM1A, therefore Utarget＝U1-ΔU1When M is1When the preset target range is satisfied, the fine adjustment of the ink ejection voltage of the ink jet print head 1 is completed. In the present embodiment, generally, the difference between M and Mtarget is within ± 5% of Mtarget, that is, the ink ejection voltage corresponding to M satisfying this condition may be set as the target ink ejection voltage. The fine tuning process of the target ink-jet voltage corresponding to other ink-jet print heads is similar to that of the other ink-jet print heads, and is not described in detail herein.
In the above embodiment, the ink-jet voltage corresponding to each ink-jet print head is adjusted according to the target ink-jet amount, so that the actual weight of the ink ejected by each ink-jet print head is relatively close, the final film thickness of the formed film is relatively uniform, a nozzle driving unit (DPN) with high cost is not required, and the equipment cost is further significantly reduced.
In one embodiment, as shown in fig. 5, after the step of determining the target ink-jet voltage corresponding to each ink-jet print head according to the linear relationship corresponding to each ink-jet print head and the target ink-jet amount of each ink-jet print head, the method further includes the following steps:
step 502, grouping nozzles on the same inkjet print head into a plurality of groups, wherein the number of the nozzles in each group is multiple, and acquiring the actual weight of the ink ejected by the nozzles in each group under the target inkjet voltage.
The difference of the ink jet amount can be caused by the processing precision or the working condition, time and the like among different nozzles on the same ink jet printing head. Generally, there is a difference of about 10% in the amount of ink ejected by different nozzle combinations on the same ink jet print head, and therefore, in order to overcome this difference, the film thickness uniformity is further improved in the present embodiment, so that the calibration operation is performed on one or more of the plurality of ink jet print heads used. Specifically, a plurality of nozzles corresponding to the same inkjet print head are grouped into a plurality of groups, wherein the number of the nozzles in each group can be multiple, and the actual weight of the ink ejected by the corresponding nozzle in each group under the target ink ejection voltage is measured. Specifically, when the nozzles of each inkjet printing head are grouped, the nozzles can be equally divided according to the number of a plurality of nozzles corresponding to the same inkjet printing head, that is, the number of nozzles corresponding to each group under the same inkjet printing head is the same; or, on the basis of a certain number, the number of nozzles corresponding to each group in the same ink jet print head is a multiple of the reference number.
And step 504, judging whether the actual ink weight sprayed by each grouped nozzle under the target ink-jet voltage meets a preset condition or not, and adjusting the overall ink-jet frequency of the grouped nozzles which do not meet the preset condition.
In one embodiment, the preset condition includes a first weight threshold range determined by apportionment according to target ink ejection amounts of the ink jet print heads corresponding to the grouped nozzles. For example, assuming that 1000 nozzles are disposed under one inkjet print head, and the corresponding target ink ejection amount is M, the nozzles are allocated to a single nozzle, each corresponding ideal target ink ejection amount is M/1000, the 1000 nozzles under the inkjet print head are grouped, the number of the nozzles in each group is N, and when detecting, the ideal target ink ejection amount corresponding to each group is M × N/1000. Since in the actual operation process, if each group is to reach the ideal target ink jet amount, the debugging workload is increased undoubtedly, in this embodiment, an acceptable error range may be determined according to the ideal target ink jet amount corresponding to each group and the specific coating precision requirement, and in this embodiment, assuming that the acceptable error range is ± 5% of the ideal target ink jet amount corresponding to the group, the first weight threshold range corresponding to the group is 95% of the ideal target ink jet amount corresponding to the group and 105% of the ideal target ink jet amount corresponding to the group.
Therefore, when the actual ink weight ejected by a certain group of nozzles in each group under the target ink-ejecting voltage falls within the first weight threshold range, the actual ink weight ejected by the group is in accordance with the requirement, and the ink-ejecting frequency of the nozzles in the group does not need to be adjusted. When the actual ink weight ejected by a certain group of nozzles under the target ink jet voltage does not fall within the first weight threshold range, it indicates that the actual ink weight ejected by the group does not meet the requirement, and therefore, the overall ink jet frequency of the nozzles in the group needs to be adjusted, so that the actual ink weight ejected by the group can meet the requirement.
In one embodiment, the preset condition may also be a second weight threshold range determined based on the actual weight of ink ejected from each group under the same inkjet printhead. Specifically, in this embodiment, the second weight threshold range is determined based on the actual weight of the group ejected, which is closest to the ideal target ink ejection amount corresponding to the group, among the actual weights of the inks ejected from the groups under the same inkjet print head, that is, the actual weight of the group ejected, which is closest to the ideal target ink ejection amount, and according to the acceptable error range. The specific determination process is similar to that described above, and is not described herein again.
For example, taking the case that the nozzles corresponding to each inkjet print head are divided into groups by number, as shown in fig. 6, the nozzles in the inkjet print head a are divided into groups by number, wherein the nozzles 1 to 100 are divided into one group, 101 and 200 are divided into one group, 201 and 300 are divided into one group, … …, and each hundred nozzles are divided into one group in the present embodiment (the number of nozzles in each group depends on the fluidity of the ink when actually grouped, the better the fluidity of the ink, the more the number of nozzles in the group can be, that is, the film thickness uniformity of the film formed by the nozzles in the group is ensured by the flow of the ink itself). At a target ink-jet voltage UtargetThe weight of each component is measured by using 30000-50000 drops of lower ink, and the weight of each component is measured by using M1-100, M101-200 and M201-300 … ….
Since the manufacturing accuracy of the nozzle size is limited, the same amount of ink ejected from all the nozzles cannot be guaranteed even at the same voltage, and therefore, the amount of ink ejected from different nozzle combinations on the same inkjet print head usually differs by about 10%, and the application pattern (i.e., the ink ejection frequency) corresponding to each nozzle combination is finely adjusted based on the measurement result. The fine adjustment in this embodiment may be performed in accordance with a second weight threshold range determined by the actual ink weight ejected from each component. Specifically, as shown in fig. 6 (in the drawing, the black droplet 4 is an ink droplet printed on the substrate 1), assuming that the ink ejection weights M1-100, M101-. In the pattern printed by the nozzles 1-100 in fig. 6, 5 rows of ink droplets are provided, and the adjusted nozzles 201 and 300 have 6 rows, and the ink droplets 4 are fused with each other after being dropped on the substrate, so that a uniform film is finally formed, and thus, the large-area uniform coating by using the inkjet printing can be realized.
In this embodiment, if the actual weight of the ink ejected from the nozzles corresponding to the group is greater than the upper limit value of the preset condition, the ink ejection frequency of the nozzles corresponding to the group is decreased; and if the actual ink weight ejected by the nozzles corresponding to the group is less than the lower limit value of the preset condition, increasing the ink ejection frequency of the nozzles corresponding to the group. Adjustment of the nozzles corresponding to other groups or nozzle groups corresponding to other ink jet print heads is similar and will not be described in detail herein.
And step 506, printing according to the adjusted overall ink jet frequency of each grouped nozzle and the target ink jet voltage of the printing head.
In this embodiment, if there is a large difference between the actual ink weights ejected by the plurality of nozzles corresponding to each of the ink jet print heads at the target ink ejection voltage, the film thickness of the formed film becomes uneven. Therefore, according to the difference, the present embodiment can perform grouping measurement on a plurality of nozzles under the same inkjet print head, and adjust the inkjet frequency of the nozzles in the group by measuring the actual ink weight ejected by each group, so that the actual ink weights ejected by the plurality of nozzles under the same print head under the target inkjet voltage are closer, and the final film thickness is more uniform.
It should be understood that, although the steps in the flowcharts of fig. 1 to 5 are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 1-5 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performing the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternately with other steps or at least some of the sub-steps or stages of other steps.
In one embodiment, as shown in fig. 7, there is provided an inkjet printing apparatus including: an acquisition module 701, a target ink ejection voltage determination module 702, and a printing module 703, wherein,
the acquiring module 701 is configured to acquire a linear relationship between inkjet voltages and inkjet weights respectively corresponding to a plurality of inkjet print heads; the target ink-jet voltage determining module 702 is configured to determine a target ink-jet voltage corresponding to each ink-jet print head according to the linear relationship corresponding to each ink-jet print head and the target ink-jet amount of each ink-jet print head; the printing module 703 is configured to perform printing according to a target inkjet voltage corresponding to each inkjet print head.
In one embodiment, as shown in fig. 8, the inkjet printing apparatus further includes a detection module 801, a determination module 802, and an inkjet frequency adjustment module 803, where the detection module 801 is configured to perform a plurality of grouping on nozzles on the same inkjet print head, and obtain an actual ink weight ejected by each group of nozzles under a target inkjet voltage, where the number of nozzles in each group is multiple; the judging module 802 is configured to judge whether an actual ink weight ejected by each group of nozzles under a target ink ejection voltage meets a preset condition; the ink jet frequency adjusting module 802 is used for adjusting the overall ink jet frequency of the grouped nozzles which do not meet the preset conditions; the printing module 703 is further configured to print according to the adjusted overall ink ejection frequency of each group of nozzles and the target ink ejection voltage of the print head.
In one embodiment, as shown in FIG. 9, the detection module 801 comprises: when the electronic precision balance 8010 and the ink collecting groove 8020 disposed on the electronic precision balance 8010 are in operation, the inkjet printing heads A, B and C are moved to a position right above the ink collecting groove 8020, so that during ink jet, the ink collecting groove 8020 can collect ink ejected from the inkjet printing heads, and the weight of the collected ink is measured by the precision balance 8010. In this embodiment, the precision of the precision balance 8010 is 0.0001g, so that the measurement error is small, and the uniformity of ink jet printing can be more effectively realized.
For specific limitations of the inkjet printing apparatus, reference may be made to the above limitations of the inkjet printing method, which are not described in detail herein. The various modules in the inkjet printing apparatus described above may be implemented in whole or in part by software, hardware, and combinations thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as shown in fig. 10. The computer device includes a processor, a memory, a network interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a method of inkjet printing. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.
Those skilled in the art will appreciate that the architecture shown in fig. 10 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is provided, comprising a memory having a computer program stored therein and a processor that when executing the computer program performs the steps of:
acquiring linear relations between ink-jet voltages and ink-jet weights respectively corresponding to a plurality of ink-jet printing heads;
determining target ink jet voltage corresponding to each ink jet printing head according to the linear relation corresponding to each ink jet printing head and the target ink jet amount of each ink jet printing head;
and printing according to the target ink jet voltage corresponding to each ink jet printing head.
In one embodiment, the step of determining the target ink-jet voltage corresponding to each ink-jet print head according to the linear relationship corresponding to each ink-jet print head and the target ink-jet amount of each ink-jet print head comprises: carrying out a plurality of groups on nozzles on the same ink jet printing head, wherein the number of the nozzles in each group is multiple, and acquiring the actual ink weight jetted by each group of nozzles under the target ink jet voltage; judging whether the actual ink weight sprayed by each grouped nozzle under the target ink-jet voltage meets a preset condition or not, and adjusting the overall ink-jet frequency of the grouped nozzles which do not meet the preset condition; and printing according to the adjusted overall ink jet frequency of each group of nozzles and the target ink jet voltage of the printing head.
In one embodiment, the preset condition comprises a first weight threshold range determined by apportionment of target ink jetting amounts of the ink jet print heads corresponding to the grouped nozzles or a second weight threshold range determined by actual ink jetting weights of the groups under the same ink jet print head;
judging whether the actual ink weight sprayed by each grouped nozzle under the target ink-jet voltage meets a preset condition or not, and adjusting the overall ink-jet frequency of the grouped nozzles which do not meet the preset condition, wherein the method comprises the following steps: and judging whether the actual ink weight sprayed by each grouped nozzle under the target ink spraying voltage meets a first weight threshold range or a second weight threshold range, and adjusting the overall ink spraying frequency of the grouped nozzles which do not meet the first weight threshold range or meet the second weight threshold range.
In one embodiment, the target ink ejection amount is determined according to a target coating film thickness and a target coating area.
In one embodiment, obtaining a linear relationship between the ink ejection voltage and the ink ejection weight corresponding to each of the plurality of ink jet print heads includes: detecting the weight of ink respectively ejected by at least two groups of voltage values of a plurality of ink-jet printing heads under a plurality of voltage conditions corresponding to the same waveform; and establishing a linear relation between the voltage and the ink weight of each ink jet printing head according to at least two groups of voltage values corresponding to the same waveform and the weight of the respectively ejected ink.
In one embodiment, determining the target ink-jet voltage corresponding to each ink-jet print head according to the linear relationship corresponding to each ink-jet print head and the target ink-jet amount of each ink-jet print head comprises: according to the linear relation, first ink jet voltages respectively corresponding to the ink jet printing heads on the corresponding target ink jet amount and the linear relation are obtained; detecting the weight of first ink ejected by each ink-jet printing head under the corresponding first ink-jet voltage; if the first ink weight is within an allowable error range, the target ink jet voltage is a first ink jet voltage; and if the first ink weight is not in the allowable error range, acquiring second ink jet voltage corresponding to each ink jet printing head under the target ink jet amount according to the first ink weight of each ink jet printing head, the target ink jet amount and the linear relation, wherein the second ink jet voltage is the target ink jet voltage.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method of inkjet printing, the method comprising:
acquiring linear relations between ink-jet voltages and ink-jet weights respectively corresponding to a plurality of ink-jet printing heads;
determining target ink jet voltage corresponding to each ink jet printing head according to the linear relation corresponding to each ink jet printing head and the target ink jet weight of each ink jet printing head;
Respectively adjusting the ink jetting frequency of a plurality of nozzles under each ink jetting printing head based on the target ink jetting voltage corresponding to each ink jetting printing head and the actual ink weight jetted under the target ink jetting voltage;
printing according to the target ink-jet voltage corresponding to each ink-jet printing head and the ink-jet frequency adjusted by a plurality of nozzles under each ink-jet printing head;
the inkjet frequency of a plurality of nozzles under each inkjet printing head is adjusted respectively based on the target inkjet voltage corresponding to each inkjet printing head and the actual ink weight jetted under the target inkjet voltage, including:
carrying out a plurality of groups of nozzles on the same ink jet printing head, wherein the number of the nozzles in each group is multiple, and acquiring the actual ink weight ejected by each group of nozzles under the target ink jet voltage;
judging whether the actual ink weight sprayed by each grouped nozzle under the target ink-jet voltage meets a preset condition or not, and adjusting the overall ink-jet frequency of the grouped nozzles which do not meet the preset condition;
and printing according to the adjusted overall ink jet frequency of each grouped nozzle and the target ink jet voltage of the printing head.
2. The method of inkjet printing according to claim 1 wherein said grouping nozzles on the same inkjet printhead comprises:
Equally dividing a plurality of nozzles corresponding to the same ink jet printing head to obtain a plurality of groups with the same number of corresponding nozzles in each group; alternatively, the first and second liquid crystal display panels may be,
and grouping a plurality of nozzles corresponding to the same ink jet printing head by adopting the multiple of the preset reference number to obtain a plurality of groups of which the number of the nozzles corresponding to each group is the multiple of the preset reference number.
3. The method of inkjet printing according to claim 1, wherein the preset condition includes a first weight threshold range determined by apportionment according to a target ink ejection weight of the inkjet print head corresponding to each nozzle group, or a second weight threshold range determined by an actual ink weight ejected by each group under the same inkjet print head;
the method for judging whether the actual ink weight sprayed by each grouped nozzle under the target ink-jet voltage meets the preset condition or not and adjusting the overall ink-jet frequency of the grouped nozzles which do not meet the preset condition comprises the following steps:
and judging whether the actual ink weight sprayed by each grouped nozzle under the target ink spraying voltage meets the first weight threshold range or the second weight threshold range, and adjusting the overall ink spraying frequency of the grouped nozzles which do not meet the first weight threshold range or the second weight threshold range.
4. Method of inkjet printing according to claim 1 wherein the target inkjet weight is determined from a target coating film thickness and a target coating area.
5. The method of inkjet printing according to any one of claims 1 to 4, wherein the obtaining of the linear relationship between the ink ejection voltage and the ink ejection weight corresponding to each of the plurality of inkjet print heads comprises:
detecting the weight of ink which is respectively sprayed out by at least two groups of voltage values under a plurality of voltage conditions corresponding to the same waveform by a plurality of ink-jet printing heads;
and establishing a linear relation between the voltage and the ink weight of each ink-jet printing head according to at least two groups of voltage values corresponding to the same waveform and the weight of the respectively ejected ink.
6. The method of inkjet printing according to any one of claims 1 to 4, wherein determining the target ink ejection voltage for each inkjet print head according to the linear relationship corresponding to each inkjet print head and the target ink ejection weight of each inkjet print head comprises:
according to the linear relation, obtaining the corresponding target ink-jet weight of each ink-jet printing head and the corresponding first ink-jet voltage on the linear relation;
Detecting the weight of first ink ejected by each ink jet printing head under the corresponding first ink jet voltage;
if the weight of the first ink is within an allowable error range, the target ink jet voltage is the first ink jet voltage;
and if the first ink weight is not in an allowable error range, acquiring second ink jet voltage corresponding to each ink jet printing head under the target ink jet weight according to the first ink weight of each ink jet printing head, the target ink jet weight and the linear relation, wherein the target ink jet voltage is the second ink jet voltage.
7. An inkjet printing apparatus, the apparatus comprising: an acquisition module, a target ink-jet voltage determination module, an ink-jet frequency adjustment module and a printing module,
the acquisition module is used for acquiring linear relations between ink jet voltages and ink jet weights respectively corresponding to the plurality of ink jet printing heads;
the target ink jet voltage determining module is used for determining the target ink jet voltage corresponding to each ink jet printing head according to the linear relation corresponding to each ink jet printing head and the target ink jet weight of each ink jet printing head;
the ink jet frequency adjusting module is used for respectively adjusting the ink jet frequency of a plurality of nozzles under each ink jet printing head based on the target ink jet voltage corresponding to each ink jet printing head and the actual ink weight jetted under the target ink jet voltage;
The printing module is used for printing according to the target ink jet voltage corresponding to each ink jet printing head and the ink jet frequency adjusted by the plurality of nozzles under each ink jet printing head;
the ink jet frequency adjusting module also comprises a detection submodule, a judgment submodule and an ink jet frequency adjusting submodule,
the detection submodule is used for carrying out a plurality of groups on the nozzles on the same ink jet printing head to obtain the actual ink weight jetted by each group of nozzles under the target ink jet voltage, and the number of the nozzles in each group is multiple;
the judgment submodule is used for judging whether the actual ink weight sprayed by each group of nozzles under the target ink-jet voltage meets a preset condition or not;
the ink jet frequency adjusting submodule is used for adjusting the whole ink jet frequency of the grouped nozzles which do not meet the preset condition;
and the printing module is also used for printing according to the adjusted overall ink jet frequency of each group of nozzles and the target ink jet voltage of the printing head.
8. Inkjet printing apparatus according to claim 7 wherein the detection submodule is further configured to:
equally dividing a plurality of nozzles corresponding to the same ink jet printing head to obtain a plurality of groups with the same number of nozzles in each group; alternatively, the first and second electrodes may be,
And grouping a plurality of nozzles corresponding to the same ink jet printing head by adopting the multiple of the preset reference number to obtain a plurality of groups of which the number of the nozzles corresponding to each group is the multiple of the preset reference number.
9. Inkjet printing apparatus according to claim 7 wherein the detection submodule includes: the ink jet printing device comprises an electronic precision balance and an ink collecting tank arranged on the electronic precision balance, wherein when the ink jet printing device works, the ink jet printing head moves to a position right above the ink collecting tank.
10. A computer device comprising a memory and a processor, the memory storing a computer program, wherein the processor implements the steps of the method of any one of claims 1 to 6 when executing the computer program.
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| US4588998A (en) * | 1983-07-27 | 1986-05-13 | Ricoh Company, Ltd. | Ink jet head having curved ink |
| JPH10315462A (en) * | 1997-05-14 | 1998-12-02 | Seiko Epson Corp | Driving system for ink jet printing head |
| KR20070084890A (en) * | 2006-02-22 | 2007-08-27 | 삼성전자주식회사 | Method for uniformly controlling ink ejecting characteristic of inkjet head |
| JP2008018423A (en) * | 2006-06-07 | 2008-01-31 | Applied Materials Inc | System and method for calibrating inkjet printhead nozzle by using light transmittance transmitted through dispensed ink |
| US7722145B2 (en) * | 2006-12-28 | 2010-05-25 | Toshiba Tec Kabushiki Kaisha | Ink jet head driving apparatus and ink jet head driving method |
| EP2296899B1 (en) * | 2008-06-30 | 2018-07-18 | Fujifilm Dimatix, Inc. | Ink jetting |
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