CN115402005A

CN115402005A - Nozzle detection method and detection device for printing head and storage medium

Info

Publication number: CN115402005A
Application number: CN202110590843.1A
Authority: CN
Inventors: 罗秋园
Original assignee: Guangdong Juhua Printing Display Technology Co Ltd
Current assignee: Guangdong Juhua Printing Display Technology Co Ltd
Priority date: 2021-05-28
Filing date: 2021-05-28
Publication date: 2022-11-29
Anticipated expiration: 2041-05-28
Also published as: CN115402005B

Abstract

The application provides a nozzle detection method, a detection device and a storage medium of a printing head, wherein the nozzle detection method of the printing head comprises the following steps: selecting a plurality of driving waveforms; detecting nozzles of the printing head under the driving of any one of at least two driving waveforms, and acquiring a failure nozzle set corresponding to the driving waveform according to the detected failure nozzles; determining a failure type of the failed nozzle according to at least two failed nozzle sets. The failure nozzle in the printing head can be effectively detected, the failure type of the failure nozzle is distinguished, the comprehensiveness of detection is improved, and resource waste is avoided.

Description

Nozzle detection method and detection device for printing head and storage medium

Technical Field

The present disclosure relates to the field of inkjet printing technologies, and in particular, to a nozzle detection method and device for a printhead, and a storage medium.

Background

An Organic Light Emitting Diode (OLED) Display device has many advantages of self-luminescence, low driving voltage, high luminous efficiency, short response time, and wide temperature range, and is considered as a Display device with the most potential development. Compared with evaporation OLED, the ink-jet printing OLED has the characteristics of lightness, thinness, large area, low cost, green manufacturing and the like, thereby receiving wide attention and being expected to be widely applied to the aspects of mobile phone screens, computer displays, full-color televisions and the like in the future.

It is understood that there is a failure condition of nozzles in the print head, and when the failed nozzles are used for ink jet printing, the problems of non-uniform light emission, color mixing and the like of the OLED are easily caused. In the existing method for detecting the nozzle of the printing head, when the abnormality of the ink jet printing is detected, the corresponding nozzle can be directly shielded and is not used any more. However, the method enables different types of failed nozzles to be processed uniformly, so that detection is incomplete, and resource waste is easily caused.

Disclosure of Invention

The application provides a nozzle detection method, a nozzle detection device and a storage medium of a printing head, and aims to solve the problems that due to the fact that different types of failed nozzles are processed in a unified mode in the existing nozzle detection method of the printing head, detection is incomplete, and resource waste is prone to occurring.

The application provides a nozzle detection method of a printing head, which comprises the following steps:

selecting a plurality of driving waveforms;

detecting nozzles of the printing head by adopting any one of a plurality of driving waveforms, and acquiring a failure nozzle set corresponding to the driving waveform according to a detected failure nozzle;

and determining the failure type of the failed nozzle according to the failed nozzle set corresponding to at least two driving waveforms.

Optionally, in some embodiments of the present application, a first driving waveform and a second driving waveform are set;

detecting nozzles of the printing head under the driving of the first driving waveform, and acquiring a first failed nozzle set corresponding to the first driving waveform according to the detected failed nozzles;

detecting nozzles of the printing head under the driving of the second driving waveform, and acquiring a second failed nozzle set corresponding to the second driving waveform according to the detected failed nozzles;

determining a failure type of the failed nozzle from the first set of failed nozzles and the second set of failed nozzles.

Optionally, in some embodiments of the present application, the detecting the nozzles of the print head under the driving of the first driving waveform, and the acquiring a first failed nozzle set corresponding to the first driving waveform according to the detected failed nozzles includes:

detecting nozzles of the printing head by using a first detection method under the driving of the first driving waveform, and acquiring a first failed nozzle subset corresponding to the first driving waveform according to the detected failed nozzles;

detecting nozzles of the printing head by using a second detection method under the driving of the first driving waveform, and acquiring a second failed nozzle subset corresponding to the first driving waveform according to the detected failed nozzles;

and merging the first failed nozzle subset and the second failed nozzle subset to obtain the first failed nozzle set.

Optionally, in some embodiments of the present application, the detecting the nozzles of the print head under the driving of the second driving waveform, and the acquiring a second failed nozzle set corresponding to the second driving waveform according to the detected failed nozzles includes:

detecting nozzles of the printing head by using the first detection method under the driving of the second driving waveform, and acquiring a third failed nozzle subset corresponding to the second driving waveform according to the detected failed nozzles;

detecting nozzles of the printing head by using the second detection method under the driving of the second driving waveform, and acquiring a fourth failed nozzle subset corresponding to the second driving waveform according to the detected failed nozzles;

and merging the third failed nozzle subset and the fourth failed nozzle subset to obtain the second failed nozzle set.

Optionally, in some embodiments of the present application, the first detection method is a flight detection method, and the second detection method is a dot matrix detection method.

Optionally, in some embodiments of the present application, the step of determining a failure type of the failed nozzle according to the set of failed nozzles corresponding to at least two of the driving waveforms includes:

if a nozzle is located in all the failed nozzle sets, determining that the nozzle is a hardware failed nozzle;

and if a nozzle is positioned in part of the failed nozzle set, judging the nozzle as a driving failed nozzle.

Optionally, in some embodiments of the present application, the method for detecting a nozzle of a print head further includes:

when any driving waveform is adopted to detect the printing head again, all the hardware failed nozzles are not detected any more, and/or when any driving waveform is adopted to drive the printing head to print, all the hardware failed nozzles are forbidden to work.

when any one of the driving waveforms is adopted to detect the printing head again, the driving failure nozzle corresponding to the driving waveform is not detected any more, and/or when any one of the driving waveforms is adopted to drive the printing head to print, the driving failure nozzle corresponding to the driving waveform is prohibited from working.

Optionally, in some embodiments of the present application, the step of selecting the plurality of driving waveforms includes:

setting a preset driving waveform;

and detecting the nozzles of the printing head under the driving of the preset driving waveform, and selecting the preset driving waveform as the driving waveform when the ratio of the detected number of failed nozzles to the total number of the nozzles of the printing head is less than or equal to 40%.

Optionally, in some embodiments of the present application, nozzles of the print head are detected by using a first detection method under the driving of the first driving waveform, and a first failed nozzle set corresponding to the first driving waveform is obtained according to detected failed nozzles;

and detecting the nozzles of the printing head by using the first detection method under the driving of the second driving waveform, and acquiring a second failed nozzle set corresponding to the second driving waveform according to the detected failed nozzles.

Correspondingly, the present application also provides a nozzle detection device of a print head, comprising:

the setting module is used for selecting a plurality of driving waveforms;

the detection module is used for detecting the nozzles of the printing head by adopting any one of the driving waveforms and acquiring a failed nozzle set corresponding to the driving waveform according to the detected failed nozzle;

and the processing module is used for determining the failure type of the failed nozzle according to the failed nozzle set corresponding to at least two driving waveforms.

The present application further provides a storage medium storing a plurality of instructions adapted to be loaded by a processor to perform the nozzle detection method of the printhead according to any one of the above.

The application provides a nozzle detection method, a detection device and a storage medium of a printing head, wherein the nozzle detection method of the printing head comprises the following steps: selecting a plurality of driving waveforms; detecting nozzles of the printing head under the driving of any one of at least two driving waveforms, and acquiring a failure nozzle set corresponding to the driving waveform according to the detected failure nozzles; determining a failure type of the failed nozzle according to at least two failed nozzle sets. The failure nozzle in the printing head can be effectively detected, failure types of the failure nozzles are distinguished, the comprehensiveness of detection is improved, and resource waste is avoided.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a first schematic flow chart of a nozzle detection method of a printhead provided herein;

FIG. 2 is a schematic flow chart of step 101 of FIG. 1;

FIG. 3 is a schematic view of the ink ejection status provided herein;

FIG. 4 is a schematic flow chart of step 103 of FIG. 1;

FIG. 5 is a second schematic flow chart of a nozzle detection method of a printhead provided herein;

FIG. 6 is a schematic diagram of a first process of step 202 of FIG. 5;

FIG. 7 is a schematic diagram of a first process of step 203 in FIG. 5;

FIG. 8 is a second schematic flow chart of step 202 of FIG. 2;

FIG. 9 is a second schematic flow chart of step 203 of FIG. 2;

fig. 10 is a schematic structural diagram of a nozzle detection device of a print head provided in the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. Furthermore, it should be understood that the detailed description and specific examples, while indicating exemplary embodiments of the invention, are given by way of illustration and explanation only, and are not intended to limit the scope of the invention.

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, features defined as "first" and "second" may explicitly or implicitly include one or more of the described features.

The application provides a nozzle detection method and a nozzle detection device for a printing head and a storage medium. The following are detailed below. It should be noted that the following description of the embodiments is not intended to limit the preferred order of the embodiments.

Referring to fig. 1, fig. 1 is a first flowchart of a nozzle detection method of a printhead according to the present disclosure. Specifically, the nozzle detection method of the printing head comprises the following steps:

101. a number of drive waveforms are selected.

Specifically, each driving waveform corresponds to a driving voltage and a driving time. The corresponding driving voltage and driving time are applied to the printing head, so that the nozzle of the printing head can realize ink drop ejection. Generally, the larger the drive voltage, the faster the ink drop velocity. The longer the drive time, the faster the ink drop velocity. Different driving voltages and driving time can be combined to achieve the effect that the ink jetting speed of a plurality of nozzles is the same, but the difference of the single drop ink jetting volume is within 10%.

Specifically, the drive waveform may be a trapezoidal wave, a square wave, a sine wave, or the like. In the present application, the drive waveform is a trapezoidal wave. From the residual oscillation and the displacement peak value of the piezoelectric vibration plate, the trapezoidal wave can realize larger displacement peak value and smaller residual oscillation of the piezoelectric vibration plate relative to the square wave or the sine wave, and is more favorable for stable ejection of ink drops. The peak displacement value and the residual oscillation of the piezoelectric vibrating plate are the main criteria for evaluating the driving performance of the print head, and are not described herein again.

Specifically, two or more drive waveforms may be set. For example, the driving waveforms may be set to 2, 3, 4, and the like, and may be specifically set according to actual detection requirements, which is not specifically limited in this application.

Specifically, in some embodiments, referring to fig. 2, step 101 includes:

1011. a predetermined driving waveform is set.

Specifically, the driving voltage and the driving time of the preset driving waveform may be set according to the ink ejection speed required by the nozzle of the print head in actual operation.

1012. And detecting the nozzles of the printing head under the driving of the preset driving waveform, and setting the preset driving waveform as one of the driving waveforms when the ratio of the detected number of failed nozzles to the total number of the nozzles of the printing head is less than or equal to 40%.

Specifically, under the driving of the preset driving waveform set in step 1011, the detection device may assign an independent driving waveform to each nozzle by collecting actual data of ejected ink droplets under the preset driving waveform according to the set preset driving waveform and then performing algorithm calculation. When the ratio of the number of failed nozzles finally detected by the detection equipment according to the preset driving waveform to the total number of nozzles of the printing head is less than or equal to 40%, the preset driving waveform is set to be the driving waveform required by the application. When the ratio of the detected number of failed nozzles to the total number of nozzles of the print head is greater than 40%, the driving voltage and/or the driving time of the preset driving waveform is adjusted, and step 1012 is repeated until the ratio of the detected number of failed nozzles to the total number of nozzles of the print head is less than or equal to 40%.

It will be appreciated that

steps

1011 and 1012 may be repeated to select a number of drive waveforms.

102. And detecting the nozzles of the printing head by adopting any one of the driving waveforms, and acquiring a failed nozzle set corresponding to the driving waveform according to the detected failed nozzle.

As can be seen from the above, in step 101, a plurality of driving waveforms are set. In some embodiments of the present application, the nozzles of the print head may be detected under the drive of each drive waveform, and the set of failed nozzles corresponding to the drive waveform may be acquired based on the detected failed nozzles. That is, each drive waveform corresponds to a set of failed nozzles, so that the accuracy and comprehensiveness of detection can be improved.

In other embodiments of the present application, when the number of the driving waveforms is set to be plural, a partial driving waveform may be selected, the nozzles of the print head may be detected under driving of any one of the partial driving waveforms, and the failed nozzle set corresponding to the driving waveform may be acquired according to the detected failed nozzle. It can be understood that, in the actual detection process, in order to save time and improve the detection efficiency, the number of the tested driving waveforms can be reduced, and it is sufficient that the number of the driving waveforms is greater than or equal to 2.

Further, it will be appreciated that each print head includes a plurality of nozzles. When nozzles of a print head are detected under the drive of any one drive waveform, some nozzles may have at least one defect type of X offset, Y offset, scatter, and the like. Specifically, please refer to fig. 3, wherein fig. 3 is a schematic view of an inkjet status provided by the present application. Here, the a position is an ink droplet in an ideal ink ejection state. And B is an ink drop with the ink jet shifted along the X direction. At C is an ink droplet which is shifted in the Y direction by the ink jet. And D is an ink drop with scattered dots.

Therefore, the nozzles of the print head are detected under the drive of any one of the drive waveforms, and when a defective nozzle is detected, the nozzle is a defective nozzle. By integrating the detected failed nozzles, a set of failed nozzles corresponding to the drive waveform can be obtained.

In some embodiments, each nozzle may correspond to a number information and a position information. And each failed nozzle corresponds to a defect type, so the failed nozzle set may include the number information, the position information and the defect type corresponding to the failed nozzle for the subsequent operation.

Wherein, under the drive of any drive waveform, at least one detection method can be adopted to detect the nozzle of the printing head. For example, the detection method may be a flight detection method, a dot matrix detection method, or the like. The flight detection method generally uses laser to strike on the flying ink drop, and calculates the volume, speed and other data of the ink drop by collecting the refracted laser data. And then setting a parameter specification for parameters such as volume, speed and the like of the ink drops, and defining the nozzle which ejects the ink drops beyond the parameter specification as a failure nozzle. Dot matrix detection is generally performed by printing a set of 1 line X5 columns of ink drops on each printhead, and determining as abnormal drops those that are shifted by at least half the drop distance in the X direction or in the Y direction and have a spread, the corresponding nozzle being defined as a failed nozzle.

It should be noted that other nozzle abnormality detection means known to those skilled in the art may also be adopted in the present application, and will not be described herein.

103. And determining the failure type of the failed nozzle according to the failed nozzle set corresponding to at least two driving waveforms.

In step 102, any one of a plurality of driving waveforms is used to detect the nozzles of the print head, and a set of failed nozzles corresponding to the driving waveform can be obtained according to the detected failed nozzles. Then step 102 is executed multiple times to obtain at least two sets of failed nozzles corresponding to the driving waveforms.

Specifically, referring to fig. 4, step 103 includes:

1031. and comparing the failure nozzle sets corresponding to at least two driving waveforms.

There may be slight variations in the specifications of the nozzles in the printhead due to manufacturing processes, etc. Therefore, under the drive of the same drive waveform, a problem of poor ink ejection may occur in some nozzles. That is, failed nozzles in different sets of failed nozzles may not be identical. Further, as can be seen from the above, the failed nozzle set may include number information, position information, and defect information corresponding to the failed nozzles. Therefore, the failed nozzle corresponding to each driving waveform and the defect type and driving waveform corresponding to each failed nozzle can be analyzed by comparing at least two failed nozzle sets.

1032. And if the same nozzle is positioned in all the failed nozzle sets, judging that the nozzle is a hardware failed nozzle.

Specifically, if the same nozzle is located in all the failed nozzle sets, it means that the nozzle is driven by different driving waveforms to cause defective ink ejection. The nozzle is judged to be a hardware failure nozzle if the nozzle is determined to be defective ink jetting due to hardware reasons such as damage, specification non-compliance and the like.

Further, all hardware-failed nozzles are no longer detected when the print head is detected again by using any one of the driving waveforms, and/or all hardware-failed nozzles are prohibited from operating when the print head is driven by using any one of the driving waveforms to print.

It is understood that the hardware failed nozzle is a defective ink ejection due to a hardware cause such as a damaged nozzle, an unsatisfactory specification, or the like, and cannot be improved by adjusting the driving waveform. That is, the hardware-failed nozzle is a fixed failed nozzle. When any driving waveform is adopted to detect the printing head again, all hardware failed nozzles are not detected any more, so that the detection work of subsequent failed nozzles can be reduced, and the detection efficiency is improved.

Similarly, when any driving waveform is adopted to drive the printing head to print, all hardware failure nozzles are forbidden to work, the fixed failure nozzles can be always shielded in the subsequent printing process, and the printing effect of the printing head is improved.

1033. And if the same nozzle is positioned in part of the failed nozzle set, judging the nozzle as a driving failed nozzle.

Specifically, if the same nozzle is located in the partially failed nozzle set, it means that the corresponding drive waveform is not applied to the nozzle when the nozzle is determined to be a failed nozzle. That is, if a proper driving waveform is selected, the nozzle can normally eject ink. Therefore, the nozzle is determined to be a drive failure nozzle.

Further, when the printing head is detected again by adopting any one driving waveform, the driving failure nozzle corresponding to the driving waveform is not detected any more, and/or when the printing head is driven by adopting any one driving waveform to print, the driving failure nozzle corresponding to the driving waveform is prohibited from working.

It will be appreciated that the drive failed nozzle is a recoverable failed nozzle. When the print head is driven with a suitable drive waveform, the partially driven failed nozzles can resume normal operation. Therefore, it is not necessary to directly mark the drive-failed nozzle as a nozzle that is inhibited from continuing to operate or from being detected.

Specifically, when any driving waveform is adopted to drive the printing head to print, only the failed nozzle in the failed nozzle set corresponding to the driving waveform needs to be shielded, and the nozzles of the printing head can be ensured to normally jet ink under the driving of the driving waveform. When any driving waveform is adopted to detect the printing head again, the detection efficiency under the driving waveform can be improved without detecting the failed nozzles in the failed nozzle set corresponding to the driving waveform. Therefore, under the appropriate driving waveform, the nozzle judged to be the driving failure nozzle can work normally, so that the driving failure nozzle is effectively utilized, and the waste of resources is avoided.

The application provides a nozzle detection method of a printing head. The nozzle detection method of the print head comprises the following steps: first, a number of drive waveforms are selected. Then, the nozzles of the print head are detected by driving any one of a plurality of driving waveforms, and a set of failed nozzles corresponding to the driving waveform is acquired from the detected failed nozzles. Finally, a failure type of the failed nozzle is determined according to the at least two sets of failed nozzles. This application detects the nozzle of printer head through the drive respectively under two at least drive waveforms, can improve the accuracy that detects. Meanwhile, the failed nozzles are analyzed according to the at least two failed nozzle sets, so that the failure types of the failed nozzles can be effectively distinguished, and the detection comprehensiveness is improved. Furthermore, after the failure types of the failed nozzles are distinguished, the hardware failed nozzles are shielded all the time, so that the subsequent detection work is reduced; the drive failure nozzle is effectively utilized, and resource waste is avoided.

In addition, it should be noted that, in some embodiments, the printhead may be detected by using the nozzle detection method of the printhead provided in the present application before the OLED is inkjet printed every time, so as to improve the effect of inkjet printing, and further improve the problems of uneven display, color mixing and the like of the OLED.

In other embodiments of the present application, when the print head is idle, that is, when the print head does not perform the inkjet printing operation, the nozzles of the print head may be detected for a longer period, so as to monitor the nozzle status of the print head. It can be understood that the flight detection method and the lattice detection method according to the prior art can only find out quickly whether the nozzle is abnormal under a fixed driving waveform during a certain printing. And if the nozzle is abnormal, the abnormal nozzle is shielded, so that the nozzles which can be recovered under different driving waveforms are always shielded, and further, the resource waste is caused. The nozzle detection method of the printing head can comprehensively detect the failed nozzles of the printing head and determine the failure type of the failed nozzles. According to the failure type of the failed nozzle, on one hand, the detected hardware failed nozzle can be used as a fixed failed nozzle to be shielded all the time in the subsequent printing process, and the detection work of the subsequent failed nozzle is reduced. On the other hand, a detected drive failure nozzle can be effectively recovered and can be effectively detected by a flight detection method or the like without permanent shielding.

Further, although the present application describes a nozzle detection method of a print head by taking the setting of the first drive waveform and the second drive waveform as an example, the present application is not to be construed as limiting the present application.

Referring to fig. 5, fig. 5 is a second flow chart of a nozzle detection method of a printhead according to the present application. In this embodiment, the method for detecting nozzles of a print head specifically includes the following steps:

201. the first drive waveform and the second drive waveform are set.

Specifically, a first drive waveform is set. The first drive waveform corresponds to a first drive voltage of-40 volts to-60 volts. The first drive waveform corresponds to a drive time of 6000 nanoseconds to 7000 nanoseconds. A second drive waveform is set. The drive voltage of the second drive waveform is-50 volts to-65 volts. The driving time corresponding to the second driving waveform is 5000 nanoseconds to 6500 nanoseconds.

The first driving voltage and the first driving time corresponding to the first driving waveform are obtained through a large number of experimental tests. Under the drive of the first driving voltage, the printing head is in a stable working state, and the number of driving failure nozzles can be effectively reduced, so that the nozzle utilization rate and the production efficiency of the printing head are improved. The second driving waveform is also omitted herein.

202. And detecting nozzles of the printing head under the driving of the first driving waveform, and acquiring a first failed nozzle set corresponding to the first driving waveform according to the detected failed nozzles.

Specifically, in some embodiments, referring to fig. 6, fig. 6 is a first flowchart of step 202 in fig. 2. Wherein step 202 comprises:

2021. and detecting nozzles of the printing head by using a first detection method under the driving of the first driving waveform, and acquiring a first failed nozzle subset corresponding to the first driving waveform according to the detected failed nozzles.

Specifically, the nozzles of the print head are detected by a first detection method under the drive of the first drive waveform. When the nozzle has at least one defect type of X deviation, Y deviation, scatter and the like, the nozzle is judged as a failed nozzle. Then, a first subset of failed nozzles corresponding to the first drive waveform is acquired based on the detected failed nozzles.

The first detection method may be a flight detection method or a dot matrix detection method, which is not described herein again.

2022. And detecting the nozzles of the printing head by using a second detection method under the driving of the first driving waveform, and acquiring a second failed nozzle subset corresponding to the first driving waveform according to the detected failed nozzles.

Specifically, the nozzles of the print head are detected by a second detection method under the drive of the first drive waveform. When the nozzle has at least one defect type of X deviation, Y deviation, scatter and the like, the nozzle is judged as a failed nozzle. Then, a second subset of failed nozzles corresponding to the first drive waveform is acquired based on the detected failed nozzles.

The second detection method may be a flight detection method or a dot matrix detection method, which is not described herein again. In the present application, the first detection method and the second detection method are different. That is, when the first detection method is a flight detection method, the second detection method is a dot matrix detection method. When the first detection method is a dot matrix detection method, the second detection method is a flight detection method.

2023. And merging the first failed nozzle subset and the second failed nozzle subset to obtain the first failed nozzle set.

Specifically, the failed nozzles in the first failed nozzle subset and the failed nozzles in the second failed nozzle subset are merged and put together to obtain a first failed nozzle set.

203. And detecting nozzles of the printing head under the driving of the second driving waveform, and acquiring a second failed nozzle set corresponding to the second driving waveform according to the detected failed nozzles.

Specifically, in some embodiments, referring to fig. 7, fig. 7 is a first flowchart of step 203 in fig. 2. Wherein step 203 comprises:

2031. and detecting the nozzles of the printing head by using the first detection method under the driving of the second driving waveform, and acquiring a third failed nozzle subset corresponding to the second driving waveform according to the detected failed nozzles.

Specifically, the nozzles of the print head are detected by the first detection method under the drive of the second drive waveform. When the nozzle has at least one defect type of X deviation, Y deviation, scatter and the like, the nozzle is judged as a failed nozzle. Then, a third subset of failed nozzles corresponding to the second drive waveform is acquired based on the detected failed nozzles.

2032. And detecting the nozzles of the printing head by using the second detection method under the driving of the second driving waveform, and acquiring a fourth failed nozzle subset corresponding to the second driving waveform according to the detected failed nozzles.

Specifically, the nozzles of the print head are detected by a second detection method under the drive of the second drive waveform. When the nozzle has at least one defect type of X deviation, Y deviation, scatter and the like, the nozzle is judged as a failed nozzle. Then, a fourth failed nozzle subset corresponding to the second drive waveform is acquired according to the detected failed nozzles.

Similarly, the second detection method may be a flight detection method or a dot matrix detection method. The first and second assays are different. That is, when the first detection method is a flight detection method, the second detection method is a dot matrix detection method. When the first detection method is a dot-matrix detection method, the second detection method is a flight detection method.

2033. And merging the third failed nozzle subset and the fourth failed nozzle subset to obtain the second failed nozzle set.

Specifically, the failed nozzles in the third failed nozzle subset and the failed nozzles in the fourth failed nozzle subset are merged and are classified into one set, so as to obtain a second failed nozzle set.

204. Determining a failure type of the failed nozzle from the first set of failed nozzles and the second set of failed nozzles.

Specifically, please refer to the content of step 103 for step 204, which is not described herein again.

The present embodiment detects nozzles of the print head driven by the first drive waveform, and acquires a first set of failed nozzles corresponding to the first drive waveform based on the detected failed nozzles. And detecting the nozzles of the printing head under the driving of the second driving waveform, and acquiring a second failed nozzle set corresponding to the second driving waveform according to the detected failed nozzles. Then, a failure type of the failed nozzle is determined from the first set of failed nozzles and the second set of failed nozzles. Therefore, the embodiment can accelerate the detection speed and improve the production efficiency by only setting the first driving waveform and the second driving waveform. Meanwhile, under the driving of each driving waveform, the first detection method and the second detection method are adopted to detect the nozzle of the printing head, so that the detection accuracy and comprehensiveness can be improved.

Furthermore, it is understood that the different detection methods have respective advantages and disadvantages. Therefore, in this embodiment, the second detection method and the first detection method may be different to perform a complementary function, thereby improving the accuracy and comprehensiveness of the detection. For example, when the first detection method is a flight detection method and the second detection method is a dot matrix detection method, the two detection methods have partially complementary functions. In particular, flight detection is very fast, but since the emitting and receiving planes of the laser can only determine nozzles that are offset in the Y direction, failed nozzles that are offset in the X direction cannot be effectively detected. The dot matrix detection algorithm can compensate for the above-mentioned defects, and can effectively detect failed nozzles that are offset in the X direction and nozzles that have scatter.

Of course, in other embodiments, under each driving waveform, a greater variety of detection means may be used to detect the nozzles of the print head, or only one detection means may be used to detect the nozzles of the print head.

Specifically, in some embodiments of the present application, please refer to fig. 8 and 9. Fig. 8 is a second flowchart of step 202 of fig. 2. Fig. 9 is a schematic diagram of a second process of step 203 in fig. 2.

Wherein, the step 202 specifically includes:

2024. the nozzles of the print head are detected by a first detection method under the drive of the first drive waveform, and a first failed nozzle set of the first drive waveform is acquired from the detected failed nozzles.

Wherein, step 203 specifically comprises:

2034. and detecting nozzles of the printing head by using a first detection method under the driving of the second driving waveform, and acquiring a second failed nozzle set corresponding to the second driving waveform according to the detected failed nozzles.

The first detection method may be a flight detection method, a dot matrix detection method, or other detection means, which is not specifically limited in the present application.

In the embodiment, the nozzles of the printing head are detected by adopting a detection means under the driving of each driving waveform, and the detection speed can be effectively increased on the basis of distinguishing the failure type of the failed nozzles.

It will be understood by those skilled in the art that all or part of the steps of the methods of the above embodiments may be performed by instructions or by associated hardware controlled by the instructions, which may be stored in a computer readable storage medium and loaded and executed by a processor.

To this end, the present application provides a storage medium having stored therein a plurality of instructions that can be loaded by a processor to perform the steps in any of the methods for nozzle detection of a printhead provided herein. For example, the instructions may perform the steps of:

selecting a plurality of driving waveforms; detecting nozzles of the printing head by adopting any one of a plurality of driving waveforms, and acquiring a failure nozzle set corresponding to the driving waveform according to a detected failure nozzle; and determining the failure type of the failed nozzle according to the failed nozzle set corresponding to at least two driving waveforms.

The above operations can be implemented in the foregoing embodiments, and are not described in detail herein.

Wherein the storage medium may include: read Only Memory (ROM), random Access Memory (RAM), magnetic or optical disks, and the like.

Since the instructions stored in the storage medium can execute the steps in any of the methods for detecting nozzles of the print head provided by the present application, the advantageous effects that can be achieved by any of the methods for detecting nozzles of the print head provided by the present application can be achieved, and the detailed description is omitted here for the sake of brevity.

In order to better implement the above method, the present application also provides a nozzle detecting apparatus of a printhead.

Referring to fig. 10, fig. 10 is a schematic structural diagram of a nozzle detection device of a printhead according to an embodiment of the present disclosure. The nozzle detection apparatus 100 of the print head includes: the setting module 10, the detection module 20 and the processing module 30 are as follows:

(1) A setting module 10.

The setting module 10 is used to select a number of drive waveforms.

Specifically, in some embodiments, the setting module 10 is configured to set a predetermined driving waveform. The nozzles of the print head are detected under the drive of the preset drive waveforms, and when the ratio of the detected number of failed nozzles to the total number of nozzles of the print head is less than or equal to 40%, the preset drive waveform is set as one of the drive waveforms. When the ratio of the detected number of failed nozzles to the total number of nozzles of the print head is greater than 40%, the driving voltage and/or the driving time of the preset driving waveform is adjusted, and step 1012 is repeated until the ratio of the detected number of failed nozzles to the total number of nozzles of the print head is less than or equal to 40%. This process is repeated to select a number of drive waveforms.

Each driving waveform corresponds to a driving voltage and a driving time. The corresponding driving voltage and driving time are applied to the printing head, so that the nozzle of the printing head can realize ink drop ejection. Generally, the larger the driving voltage, the faster the ink droplet velocity. The longer the actuation time, the faster the ink drop velocity. The combination of different driving voltages and driving time can achieve the effect that the ink jetting speed of a plurality of nozzles is the same, but the difference of the volume of single drop ink jetting is within 10%.

The driving waveform may be a trapezoidal wave, a square wave, a sine wave, or the like. In the present application, the drive waveform is a trapezoidal wave. From the residual oscillation and the displacement peak value of the piezoelectric vibration plate, the trapezoidal wave can realize larger displacement peak value and smaller residual oscillation of the piezoelectric vibration plate relative to the square wave or the sine wave, and is more favorable for stable ejection of ink drops.

Here, the drive waveforms may be set to two or more. For example, the driving waveforms may be set to 2, 3, 4, and the like, and may be specifically set according to an actual detection requirement, which is not specifically limited in this application.

(2) A detection module 20.

The detection module 20 is configured to detect nozzles of the print head by using any one of the plurality of driving waveforms, and obtain a failed nozzle set corresponding to the driving waveform according to the detected failed nozzle.

In some embodiments, the detection module 20 may detect the nozzles of the print head under the driving of each driving waveform. The detected nozzle with the defect is a failed nozzle. The detection module 20 also acquires a set of failed nozzles corresponding to the drive waveform based on the detected failed nozzles.

In other embodiments, the detection module 20 may select a part of the driving waveforms, and detect the nozzles of the print head under the driving of any one of the part of the driving waveforms. The detected nozzle with the defect is a failed nozzle. The detection module 20 also acquires a set of failed nozzles corresponding to the drive waveform based on the detected failed nozzles.

Further, the detection module 20 may detect the nozzles of the print head by using at least one detection method under the driving of any one of the driving waveforms. For example, the detection module 20 may detect the nozzles of the print head by using a detection method; the detection module 20 can detect the nozzles of the print head by using two detection methods.

The detection method may be a flight detection method, a dot matrix detection method, or the like. The flight detection method generally uses laser to strike on the flying ink drop, and calculates the volume, speed and other data of the ink drop by collecting the refracted laser data. And then setting a parameter specification for parameters such as volume, speed and the like of the ink drops, wherein the nozzle which ejects the ink drops beyond the parameter specification is defined as a failure nozzle. Dot matrix detection is generally performed by printing a set of 1 line X5 columns of ink drops on each printhead, and determining as abnormal drops those that are shifted by at least half the drop distance in the X or Y direction and have scattered dots, and defining as failed nozzles the corresponding nozzles.

It should be noted that the detection module 20 may also adopt other nozzle abnormality detection means known to those skilled in the art, and will not be described herein.

(3) A processing module 30.

The processing module 30 is configured to determine a failure type of a failed nozzle according to a set of failed nozzles corresponding to at least two driving waveforms.

Specifically, the processing module 30 is configured to compare at least two failed nozzle sets. And if the same nozzle is positioned in all the failed nozzle sets, judging the nozzle as a hardware failed nozzle. And if the same nozzle is positioned in the partial failed nozzle set, judging the nozzle as a drive failed nozzle.

The failed nozzle set can comprise number information, position information and defect information corresponding to the failed nozzles. Therefore, the processing module 30 can determine the defect type and the driving waveform corresponding to each failed nozzle by comparing at least two failed nozzle sets. And judging the failed nozzle to be a hardware failed nozzle or a drive failed nozzle according to the defect type and the drive waveform corresponding to each failed nozzle.

Specifically, if the same nozzle is located in all the failed nozzle sets, it is described that the nozzle may generate poor ink ejection under the driving of different driving waveforms. That is, if the nozzle is determined to be defective due to damage or a hardware cause such as a specification failing to meet the specification, the processing module 30 determines that the nozzle is a hardware failure nozzle. If the same nozzle is located in a partial failed nozzle set, it means that the corresponding driving waveform is not applicable to the nozzle when the nozzle is determined to be a failed nozzle. That is, if a proper driving waveform is selected, the nozzle can normally eject ink. Thus, the processing module 30 determines that the nozzle is a drive-failed nozzle.

In view of the above, the present application provides a nozzle detection apparatus 100 for a print head, wherein the nozzle detection apparatus 100 for a print head selects a plurality of driving waveforms through a setting module 10; the detection module 20 detects the nozzles of the print head under the driving of any one of the at least two driving waveforms, and acquires a failed nozzle set corresponding to the driving waveform according to the detected failed nozzle; the processing module 30 is configured to determine a failure type of a failed nozzle from at least two sets of failed nozzles; the accuracy and comprehensiveness of the detection can be improved. Meanwhile, after the failure types of the failed nozzles are effectively distinguished, the failed nozzles belonging to different failure types can be correspondingly processed, and the detection efficiency and the utilization rate of the nozzles are improved.

The nozzle detection method, the detection device and the storage medium of the print head provided by the present application are described in detail above, and the principles and embodiments of the present application are explained herein by applying specific examples, and the above descriptions of the embodiments are only used to help understand the method and the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, the specific implementation manner and the application scope may be changed, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. A method of nozzle testing of a printhead, comprising:

selecting a plurality of driving waveforms;

2. A nozzle detecting method of a printhead according to claim 1, wherein a first drive waveform and a second drive waveform are set;

determining a failure type of the failed nozzle according to the first set of failed nozzles and the second set of failed nozzles.

3. A nozzle detecting method for a printhead according to claim 2, wherein the detecting of the nozzles of the printhead under the driving of the first drive waveform, and the acquiring of the first failed nozzle set corresponding to the first drive waveform from the detected failed nozzles comprises:

4. A nozzle detecting method for a print head according to claim 3, wherein the detecting nozzles of the print head under the driving of the second drive waveform, and the acquiring a second set of failed nozzles corresponding to the second drive waveform based on the detected failed nozzles comprises:

5. The method of claim 3 or 4, wherein the first detection method is a flight detection method and the second detection method is a dot matrix detection method.

6. The method of detecting nozzles of a printhead according to claim 1, wherein the step of determining the failure type of the failed nozzle from the set of failed nozzles corresponding to at least two of the drive waveforms includes:

and if one nozzle is positioned in part of the failed nozzle set, judging the nozzle as a drive failed nozzle.

7. The nozzle detecting method of a printhead according to claim 6, further comprising:

8. The nozzle detecting method of a printhead according to claim 6, further comprising:

when any driving waveform is adopted to detect the printing head again, the driving failure nozzle corresponding to the driving waveform is not detected any more, and/or when any driving waveform is adopted to drive the printing head to print, the driving failure nozzle corresponding to the driving waveform is prohibited from working.

9. A method of nozzle detection for a printhead as claimed in claim 1, wherein the step of selecting a number of drive waveforms comprises:

setting a preset driving waveform;

and detecting the nozzles of the printing head under the driving of the preset driving waveforms, and selecting the preset driving waveforms as one of the driving waveforms when the ratio of the detected number of failed nozzles to the total number of nozzles of the printing head is less than or equal to 40%.

10. A nozzle detection method for a print head according to claim 2, wherein nozzles of the print head are detected by a first detection method under the drive of the first drive waveform, and a first failed nozzle set corresponding to the first drive waveform is acquired based on the detected failed nozzles;

and detecting nozzles of the printing head by using the first detection method under the driving of the second driving waveform, and acquiring a second failed nozzle set corresponding to the second driving waveform according to the detected failed nozzles.

11. A nozzle sensing apparatus for a printhead, comprising:

the setting module is used for selecting a plurality of driving waveforms;

12. A storage medium storing a plurality of instructions adapted to be loaded by a processor to perform a method of nozzle detection for a printhead according to any one of claims 1 to 10.