CN111242885B - Abnormal nozzle detection method and device - Google Patents
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- G06T7/0002—Inspection of images, e.g. flaw detection
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
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- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
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Abstract
The invention relates to a detection method and a detection device of an abnormal nozzle, which are characterized in that the position of an abnormal sub-gray-scale image is determined according to a gray-scale image obtained by a gray-scale image of a pixel substrate; further, determining the position of an abnormal pixel or an abnormal pixel unit on the pixel substrate according to the position of the abnormal sub-gray level image; finally, according to the position of the abnormal image or the abnormal pixel single element, an abnormal nozzle is determined, so that the phenomenon of 'line speckle' caused by uneven film formation in the pixel can be prevented in advance in the inkjet printing process, and the display quality of the display device is further improved.
Description
Technical Field
The invention relates to the technical field of film forming, in particular to a method and a device for detecting abnormal nozzles.
Background
Among various film forming techniques, solution film forming techniques are attracting more and more attention. The solution film forming is to process the required material, for example, dispersing into nano-scale tiny particles, then dissolving in the corresponding solvent, then depositing the solution on the surface of the substrate by other equipment, and forming the required film on the surface of the substrate after the solvent evaporates.
Ink Jet Printing (IJP) is an important solution film forming technology, and has the advantages of simple operation, low cost, simple process, suitability for mass production, etc., so that it is widely used in various fields of preparation of Organic Light Emitting Diodes (OLEDs), organic thin film transistors, metal electrodes, etc., and achieves good effects.
However, in the conventional art, a display device produced through an inkjet printing process may exhibit "line stripes" in an inkjet printing direction, thereby affecting the display quality of the display device.
Disclosure of Invention
Based on this, it is necessary to provide a method and apparatus for detecting abnormal nozzles, aiming at the technical problem that the display quality is reduced due to the fact that the display device produced by the inkjet printing process in the conventional technology presents "linear marks" in the inkjet printing direction.
A method of detecting an abnormal nozzle, comprising:
acquiring a gray-scale image of a pixel substrate, wherein the gray-scale image comprises a plurality of sub-gray-scale images, and the sub-gray-scale images are in one-to-one correspondence with pixels or pixel units on the pixel substrate;
determining the position of an abnormal sub-gray level image according to the gray level image;
determining the position of an abnormal pixel or an abnormal pixel unit on the pixel substrate according to the position of the abnormal sub-gray level image;
And determining an abnormal nozzle according to the position of the abnormal pixel or the abnormal pixel unit.
In one embodiment, the pixel substrate is provided with a mark point; the gray-scale image comprises an image corresponding to the mark point; before determining the position of the abnormal pixel or the abnormal pixel unit on the pixel substrate according to the position of the abnormal sub-gray level image, the method further comprises:
determining the position of each pixel or pixel unit on the pixel substrate according to the position of the marking point;
determining the position of each sub-gray-scale image in the gray-scale images according to the positions of the images corresponding to the mark points;
and establishing a position corresponding relation between each sub-gray-scale image in the gray-scale image and each pixel or pixel unit on the pixel substrate.
In one embodiment, the determining the position of the abnormal pixel or the abnormal pixel unit on the pixel substrate according to the position of the abnormal sub-gray level image includes:
and determining the position of the abnormal pixel or the abnormal pixel unit on the pixel substrate according to the position of the abnormal sub-gray level image and the position corresponding relation.
In one embodiment, before the acquiring the grayscale image of the pixel substrate, the method further includes:
Acquiring size information of pixels or pixel units on the pixel substrate;
setting a scanning range of optical scanning according to the size information of the pixels or the pixel units;
the acquiring the gray-scale image of the pixel substrate includes:
and acquiring a gray-scale image of the pixel or the pixel unit on the pixel substrate according to the scanning range of the optical scanning.
In one embodiment, the determining the position of the abnormal sub-gray level image according to the gray level image includes:
and comparing the sub-gray-scale images of the gray-scale images to determine the positions of abnormal sub-gray-scale images with defects.
In one embodiment, the comparing each sub-gray-scale image of the gray-scale images to determine the position of the abnormal sub-gray-scale image with the defect includes:
comparing the gray scale values of the sub-gray scale images;
determining a sub-gray-scale image with abnormal gray-scale values according to the comparison result;
and determining the position of the abnormal sub-gray-scale image through the sub-gray-scale image with the abnormal gray-scale value.
In one embodiment, a corresponding relationship is arranged between the position of the pixel or the pixel unit and the nozzle; the determining the abnormal nozzle according to the position of the abnormal pixel or the abnormal pixel unit comprises the following steps:
Determining a plurality of nozzles corresponding to the abnormal pixels or the abnormal pixel units according to the corresponding relation between the positions of the pixels or the pixel units and the nozzles through the positions of the abnormal pixels or the abnormal pixel units;
and determining the abnormal nozzles in the plurality of nozzles corresponding to the abnormal pixels or the abnormal pixel units.
In one embodiment, the determining the abnormal nozzle in the plurality of nozzles corresponding to the abnormal pixel or the abnormal pixel unit includes:
comparing the nozzles corresponding to the abnormal pixels or the abnormal pixel units with the nozzles corresponding to the normal pixels;
and determining the abnormal nozzles in the plurality of nozzles corresponding to the abnormal pixels or the abnormal pixel units through at least one comparison iteration.
A detection apparatus for an abnormal nozzle, the apparatus comprising:
the device comprises an acquisition module, a display module and a display module, wherein the acquisition module is used for acquiring a gray-scale image of a pixel substrate, the gray-scale image comprises a plurality of sub-gray-scale images, and the sub-gray-scale images are in one-to-one correspondence with pixels or pixel units on the pixel substrate;
the image position determining module is used for determining the position of the abnormal sub-gray level image according to the gray level image;
The pixel position determining module is used for determining the position of an abnormal pixel or an abnormal pixel unit on the pixel substrate according to the position of the abnormal sub-gray level image;
and the abnormal nozzle determining module is used for determining the abnormal nozzle according to the position of the abnormal pixel or the abnormal pixel unit.
A detection apparatus for an abnormal nozzle, the apparatus comprising:
the optical inspection system is used for acquiring a gray-scale image of the pixel substrate, wherein the gray-scale image comprises a plurality of sub-gray-scale images, and the sub-gray-scale images are in one-to-one correspondence with pixels or pixel units on the pixel substrate;
the controller is connected with the optical inspection system and is used for determining an abnormal sub-gray-scale image according to the gray-scale image; determining the position of an abnormal pixel or an abnormal pixel unit on the pixel substrate according to the position of the abnormal sub-gray level image; and determining an abnormal nozzle according to the position of the abnormal pixel or the abnormal pixel unit.
According to the detection method and the detection device for the abnormal nozzle, the positions of the abnormal sub-gray-scale images are determined according to the gray-scale images by acquiring the gray-scale images of the pixel substrate; further, determining the position of an abnormal pixel or an abnormal pixel unit on the pixel substrate according to the position of the abnormal sub-gray level image; and finally, determining an abnormal nozzle according to the positions of the abnormal pixels or abnormal pixel units, so that the phenomenon of 'line stripes' caused by uneven film formation in the pixels can be prevented in advance in the inkjet printing process, and the display quality of the display device is further improved.
Drawings
FIGS. 1 a-1 c are schematic diagrams of OLED devices prepared using an inkjet printing process;
FIG. 1d is a schematic diagram showing a "linear speckle" of an OLED device according to the prior art;
FIG. 2a is a schematic diagram of the core structure of an inkjet printing apparatus;
FIG. 2b is a flow chart of a method of detecting abnormal nozzles according to an embodiment;
FIG. 2c is a schematic diagram of an inkjet printing process according to one embodiment;
FIG. 3a is a schematic flow chart before step S230 in one embodiment;
FIG. 3b is a schematic diagram of a pixel substrate in one embodiment;
FIG. 4 is a schematic flow chart before step S210 in one embodiment;
FIG. 5a is a flowchart illustrating the step S220 in one embodiment;
FIG. 5b is a schematic diagram of a sub-gray scale image in one embodiment;
FIG. 6 is a flowchart illustrating the step S230 in one embodiment;
FIG. 7 is a flowchart illustrating the step S620 in one embodiment;
FIG. 8 is a block diagram showing a structure of an abnormal nozzle detecting apparatus in one embodiment;
FIG. 9 is a block diagram showing a structure of an abnormal nozzle detecting apparatus in one embodiment;
FIG. 10 is a block diagram showing a structure of an abnormal nozzle detecting apparatus in one embodiment;
FIG. 11 is an internal block diagram of a computer device in one embodiment.
Detailed Description
In the production of OLED devices, some functional layer materials may be subjected to inkjet printing processes, such as Hole Injection Layer (HIL), hole Transport Layer (HTL), and light emitting layer (EML-RGB) may already be subjected to inkjet printing processes. Referring to fig. 1a, functional layer material ink 120 is dripped into the pixel opening 130 through the inkjet printing nozzle 110. Referring to fig. 1b, the inkjet printing head 110 is provided with a plurality of nozzles 140, and the nozzles 140 correspond to the pixels in the first row. The pixel openings 130 need to be filled with drops of ink material. After the inkjet printing process is completed, referring to fig. 1c, after one inkjet printing pass, the nozzles 140 fill a number of drops of ink material in all pixel openings of the first column. It should be noted that fig. 1b and 1c only illustrate the effect of filling the first row of pixels with ink by using the nozzle 140, and do not indicate that only the first row of pixels are filled with ink during one inkjet printing process.
As described in the background art, referring to fig. 1d, the display device produced by the inkjet printing process may exhibit "line stripes" in the inkjet printing direction, thereby affecting the display quality of the display device. The inventors have found that if the inkjet printing process is performed according to the matching relationship between the pixel matrix and the nozzles in the conventional technology, the display device has a high probability of exhibiting "line stripes" which cause the display device to exhibit a linear uneven brightness phenomenon. The inventor found that the root cause of this problem is that according to the ink dropping method in the conventional technology, when one of the nozzles drops an ink drop having a larger difference from the target volume in a certain pixel opening, the total volume of ink in the pixel opening is greatly different from the total volume of ink in other pixel openings, and finally the film forming thickness of the ink material is different, so that the phenomenon of 'streak' appears when the display device displays. If the condition of each nozzle can be detected, such as a nozzle with abnormal waveform parameters or a nozzle with abnormal blockage, etc., further, the phenomenon of 'line streak' can be improved from the source according to the detected condition of the nozzle.
Based on the detection method, the invention provides a detection method of an abnormal nozzle, which comprises the steps of acquiring a gray-scale image of a pixel substrate, and determining the position of an abnormal sub-gray-scale image according to the gray-scale image; further, determining the position of an abnormal pixel or an abnormal pixel unit on the pixel substrate according to the position of the abnormal sub-gray level image; and finally, determining an abnormal nozzle according to the positions of the abnormal pixels or abnormal pixel units, so that the phenomenon of 'line stripes' caused by uneven film formation in the pixels can be prevented in advance in the inkjet printing process, and the display quality of the display device is further improved.
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.
The following describes the core structure of the Ink jet printing apparatus with reference to fig. 2a, where an Ink cartridge 210 (Ink Stick) is an element filled with Ink material, and an Ink jet Print Head 201 (Print Head) is disposed at the bottom of the Ink cartridge 210, and the Ink material is ejected through nozzles (nozzles) on the Ink jet Print Head 201 and dropped into pixel openings arranged in an array on a substrate 230. The means for receiving the cartridge 210 is an Ink Cage 220 (Ink Stick Cage) which is secured to a granite beam. Wherein coordinates in three directions of X, Y, and Z can be established in the core structure of the inkjet printing apparatus, and the movement trace of the ink cage 220 (including the ink cartridge 210) moves in the X, Z directions, and the glass substrate moves in the Y direction.
In one embodiment, referring to fig. 2b, the present application provides a method for detecting abnormal nozzles, which includes the following steps:
s210, acquiring a gray-scale image of the pixel substrate.
The ink jet printing technology is used for dripping a certain volume of functional material liquid into a pixel defining layer, and the liquid is dried to form a pixel. The inkjet printing process may spray a solution of between one picoliter and several tens picoliters onto a specific object at a frequency of hundreds times per second or more, and then remove the solvent to form a thin film. For example, the droplets may have a diameter of 15 μm to 150 μm.
As shown in fig. 2c, a pixel defining layer 280 is disposed on the substrate 230, and the pixel defining layer 280 has a pixel opening 260. The liquid output from the nozzle 270 of the inkjet printing apparatus is a material ink for forming an organic functional layer of an organic light emitting diode. The ink 250 output from each nozzle 270 of the inkjet printing apparatus is dropped into each pixel opening 260 on the substrate 230, and then dried to form a pixel substrate, that is, a pixel substrate in this embodiment refers to a substrate after inkjet printing is completed. Gray scale images are typically displayed in gray scale from darkest black to brightest white, with gray scale representing the gradation levels of different brightness between darkest and brightest. The pixel substrate is provided with pixel units arranged in an array, and the pixel units comprise pixels for emitting light and pixel defining layers for defining the pixels. The gray-scale image of the pixel substrate is obtained by carrying out image acquisition on the pixel substrate through optical scanning, the gray-scale image comprises a plurality of sub-gray-scale images, and each sub-gray-scale image corresponds to each pixel unit or pixel on the pixel substrate one by one. Specifically, an optical detection system may be used to perform image acquisition on a pixel unit or a pixel on a pixel substrate, so as to obtain a gray-scale image of the pixel substrate. The grayscale image includes a plurality of sub-grayscale images. It is understood that each sub-gray-scale image in the gray-scale image may be an image including only pixels, and each sub-gray-scale image in the gray-scale image may also be an image including pixel units composed of pixels and pixel defining layers.
S220, determining the position of the abnormal sub-gray level image according to the gray level image.
The pixel opening 260 after the ink is dropped has a volume of ink therein, and the volume of the dropped ink is represented in the grayscale image of the pixel substrate. Ideally, the ink volume within each pixel opening 260 should be uniform, but there may be ink volumes within some pixel openings that differ from ink volumes within other pixel openings due to clogging of some of the nozzles themselves, anomalies in waveform parameters, or the like. If the volume of ink dropped into a pixel opening is different from the volumes of ink dropped into other pixel openings, the sub-grayscale image corresponding to the pixel opening is abnormal compared with the sub-grayscale images corresponding to other pixel openings, and the abnormal sub-grayscale image refers to the pixel or the sub-grayscale image corresponding to the pixel unit with abnormal ink volume. Specifically, the grayscale image of the pixel substrate includes a plurality of sub-grayscale images, and an abnormal sub-grayscale image can be determined from the grayscale image of the pixel substrate. And each sub-gray-scale image has a relative position in the gray-scale image, so that the position of the abnormal sub-gray-scale image can be further determined.
S230, determining the positions of abnormal pixels or abnormal pixel units on the pixel substrate according to the positions of the abnormal sub-gray level images.
Because the grayscale image of the pixel substrate includes a plurality of sub-grayscale images, the sub-grayscale images correspond to pixels or pixel units on the pixel substrate one by one, and the pixels or pixel units have opposite positions on the pixel substrate. Specifically, the position of the abnormal sub-gray level image is determined by the gray level image of the pixel substrate, and then, the pixel or the pixel unit corresponding to the abnormal sub-gray level image, which is the abnormal pixel or the pixel unit is the abnormal pixel unit, can be searched according to the position of the abnormal sub-gray level image, so that the position of the abnormal pixel or the abnormal pixel unit on the pixel substrate is determined.
S240, determining an abnormal nozzle according to the position of the abnormal pixel or the abnormal pixel unit.
And searching pixels or pixel units corresponding to the abnormal sub-gray level images according to the positions of the abnormal sub-gray level images, so as to determine the positions of the abnormal pixels or abnormal pixel units on the pixel substrate. When the ink jet printing task is set, a corresponding relation exists between the pixels and the nozzles, the pixels have opposite positions on the pixel substrate, and because each pixel corresponds to each pixel unit one by one, the corresponding relation also exists between the pixel units and the nozzles, and the pixel units have opposite positions on the pixel substrate, the abnormal pixels or the nozzles corresponding to the abnormal pixel units can be determined according to the positions of the abnormal pixels or the abnormal pixel units on the pixel substrate, and then the abnormal nozzles are determined according to the abnormal pixels or the nozzles corresponding to the abnormal pixel units.
In the embodiment, the position of the abnormal sub-gray-scale image is determined according to the gray-scale image by acquiring the gray-scale image of the pixel substrate; further, determining the position of an abnormal pixel or an abnormal pixel unit on the pixel substrate according to the position of the abnormal sub-gray level image; and finally, determining an abnormal nozzle according to the positions of the abnormal pixels or abnormal pixel units, so that the phenomenon of 'line stripes' caused by uneven film formation in the pixels can be prevented in advance in the inkjet printing process, and the display quality of the display device is further improved.
In one embodiment, the pixel substrate has a mark point disposed thereon; the grayscale image includes an image corresponding to the mark point. Referring to fig. 3a, before determining the position of an abnormal pixel or an abnormal pixel unit on a pixel substrate according to the position of an abnormal sub-gray level image, the method includes the steps of:
s310, determining the position of each pixel or pixel unit on the pixel substrate according to the position of the marking point.
S320, determining the position of each sub-gray-scale image in the gray-scale images according to the position of the image corresponding to the mark point.
S330, establishing a position corresponding relation between each sub-gray-scale image in the gray-scale image and each pixel or pixel unit on the pixel substrate.
Referring to fig. 3b, a mark point 310 is disposed on the pixel substrate, and the position of the mark point 310 may be set according to the actual situation. For example, to simplify the calculation, the mark point 310 may be set at the start position of inkjet printing. The gray-scale image obtained by image acquisition of the pixel substrate comprises an image corresponding to the mark point. With the mark point 310 on the pixel substrate as a reference point, a relative distance or a relative orientation is provided between each pixel or pixel unit on the pixel substrate and the mark point 310 on the pixel substrate, and the position of each pixel or pixel unit on the pixel substrate can be determined according to the position of the mark point 310 on the pixel substrate and the relative distance or the relative orientation between the two.
The gray-scale image includes an image corresponding to the mark point 310, and the image corresponding to the mark point 310 is taken as a reference point, so that in the gray-scale image, a relative distance or a relative azimuth exists between each sub-gray-scale image and the image corresponding to the mark point 310, and the position of each sub-gray-scale image in the gray-scale image can be determined according to the position of the image corresponding to the mark point 310 and the relative distance or the relative azimuth between the two images.
The position of each pixel or pixel unit on the pixel substrate can be determined by the position of the mark point 310, the position of each sub-gray-scale image in the gray-scale image can be determined by the position of the image corresponding to the mark point, and the corresponding relationship between the mark point 310 and the image corresponding to the mark point 310 can be established.
In this embodiment, the relationship between each sub-gray-scale image and each pixel or pixel unit is established through the mark points 310 and the images corresponding to the mark points on the pixel substrate, so that the position corresponding relationship between each sub-gray-scale image and each pixel or pixel unit is established.
In one embodiment, determining the location of an outlier pixel or outlier pixel element on the pixel substrate based on the location of the outlier sub-gray scale image comprises: and determining the positions of the abnormal pixels or abnormal pixel units on the pixel substrate according to the positions of the abnormal sub-gray level images and the position corresponding relation.
By setting the mark points on the pixel substrate, the grayscale image of the pixel substrate includes an image corresponding to the mark points. The position of each pixel on the pixel substrate can be determined by the position of the mark point 310, the position of each sub-gray-scale image in the gray-scale image can be determined by the position of the image corresponding to the mark point, and the corresponding relationship between the mark point 310 and the image corresponding to the mark point 310 can be established. Then, after determining the position of the abnormal sub-grayscale image by the grayscale image of the pixel substrate, the position of the abnormal pixel or the abnormal pixel unit on the pixel substrate may be found and determined in the positional correspondence relationship between each sub-grayscale image and each pixel according to the position of the abnormal sub-grayscale image.
In one embodiment, before acquiring the grayscale image of the pixel substrate, the method further comprises the steps of:
s410, acquiring size information of pixels or pixel units on the pixel substrate.
S420, setting a scanning range of optical scanning according to the size information of the pixels or the pixel units.
Acquiring a gray-scale image of a pixel substrate, comprising:
s430, acquiring a gray-scale image of a pixel or a pixel unit on the pixel substrate according to the scanning range of the optical scanning.
Wherein a pixel defining layer is formed on the substrate, and a pixel opening for accommodating the functional layer material is formed through the pixel defining layer. And dripping corresponding material ink into the pixel opening through an ink-jet printing process. The pixel substrate may be optically scanned by an optical inspection system to obtain a grayscale image of the pixel substrate. Firstly, acquiring size information of pixels or pixel units on a pixel substrate, secondly, setting a scanning range of optical scanning according to the size information of the pixels or the pixel units, and scanning the positions of the pixels or the pixel units on the pixel substrate to acquire gray-scale images of the pixels or the pixel units on the pixel substrate.
As a preferred embodiment, the scanning range of the optical scanning may be set in order to avoid interference of other anomalies (such as pixel defining layers) on the pixel substrate. The ink jet printing task information comprises the size information of the pixels on the pixel substrate, and the scanning range of the optical scanning can be set according to the size information of the pixels, so that the optical inspection system only scans the positions of the pixels on the pixel substrate, the acquired gray-scale image only comprises the gray-scale image of the pixels, and the gray-scale image of other positions, such as the gray-scale image of the pixel defining layer, on the pixel substrate is not included any more, and therefore only the sub-gray-scale image of the pixels is processed, the influence of other anomalies on the detection result is avoided, and the accuracy of detecting the abnormal pixels is improved.
In one embodiment, determining the location of the outlier sub-gray scale image from the gray scale image comprises: and comparing the sub-gray-scale images of the gray-scale images to determine the positions of the abnormal sub-gray-scale images with defects.
The gray-scale image of the pixel substrate comprises a plurality of sub-gray-scale images, each sub-gray-scale image is compared, a sub-gray-scale image different from other sub-gray-scale images is searched, the sub-gray-scale image different from the other sub-gray-scale images is defective, and the abnormal sub-gray-scale image is determined. And each sub-gray level image has a relative position in the gray level image. The position of the abnormal sub-gray level image can be further determined after the abnormal sub-gray level image can be determined by the gray level image of the pixel substrate.
In one embodiment, referring to fig. 5a, comparing the sub-gray scale images of the gray scale images to determine the position of the abnormal sub-gray scale image with the defect, includes:
s510, comparing the gray scale values of the sub-gray scale images.
S520, determining a sub-gray-scale image with abnormal gray-scale values according to the comparison result.
S530, determining the position of the abnormal sub-gray-scale image through the sub-gray-scale image with the abnormal gray-scale value.
The gray-scale image of the pixel substrate comprises a plurality of sub-gray-scale images, and each sub-gray-scale image has a gray-scale value. In an ideal case, the gray scale value of each sub-gray scale image should be the same, but in the actual production process, the gray scale value of each sub-gray scale image is different from other sub-gray scale images because the ink volume output by each nozzle is different from the target volume due to abnormal waveform parameters or blockage of the nozzle. Referring to fig. 5b, each sub-gray-scale image presents a different gray-scale color. Specifically, the gray scale values of the respective sub-gray scale images in the gray scale images are compared, and sub-gray scale images whose gray scale values deviate from the target values can be determined according to the comparison result. Therefore, the sub-gray-scale image with the abnormal gray-scale value can be determined, and the position of the abnormal sub-gray-scale image can be determined through the sub-gray-scale image with the abnormal gray-scale value because the sub-gray-scale image with the abnormal gray-scale value has the relative position in the gray-scale image.
In one embodiment, referring to fig. 6, a correspondence is provided between the positions of the pixels or pixel units and the nozzles. Determining an abnormal nozzle according to the position of the abnormal pixel or the abnormal pixel unit comprises:
S610, determining a plurality of nozzles corresponding to the abnormal pixel or the abnormal pixel unit through the position of the abnormal pixel or the abnormal pixel unit according to the corresponding relation between the position of the pixel or the pixel unit and the nozzles.
S620, determining abnormal nozzles in the plurality of nozzles corresponding to the abnormal pixels or the abnormal pixel units.
Before the device performs an inkjet printing task, the computer system may combine the waveform parameters corresponding to the plurality of nozzles and the nozzles into different inkjet printing strokes according to the current printing task information (such as the number of pixels, the size of pixels, etc.), and through a series of calculations, a corresponding relationship between the pixels or the pixel units and the nozzles may be generated. Each pixel or pixel unit may be allocated a plurality of nozzles, for example, one pixel or pixel unit may be allocated 3 nozzles, and the number of nozzles allocated to each pixel or pixel unit is not limited herein, but is allocated according to the actual requirement of the print job.
Specifically, according to the position of the abnormal sub-gray level image, searching pixels or pixel units corresponding to the abnormal sub-gray level image, thereby determining the position of the abnormal pixels or abnormal pixel units on the pixel substrate. And determining the nozzle corresponding to the abnormal pixel or the abnormal pixel unit through the position of the abnormal pixel or the abnormal pixel unit because the corresponding relation exists between the position of the pixel or the pixel unit and the nozzle. Since each pixel or pixel unit may be assigned a plurality of nozzles, the nozzle to which the abnormal pixel or abnormal pixel unit corresponds is determined. Since the ink droplet volume of the abnormal pixel or the abnormal pixel unit is different from that of the normal pixel, the abnormal nozzle must exist in the plurality of nozzles corresponding to the abnormal pixel or the abnormal pixel unit, and therefore, the abnormal nozzle can be found in the plurality of nozzles corresponding to the abnormal pixel or the abnormal pixel unit. It will be appreciated that abnormal nozzles include nozzles with abnormal waveform parameters and/or nozzles with abnormal nozzles, including nozzle full or half plugging anomalies.
In one embodiment, referring to fig. 7, determining an abnormal nozzle among a plurality of nozzles corresponding to an abnormal pixel or an abnormal pixel unit includes:
s710, comparing the plurality of nozzles corresponding to the abnormal pixel or the abnormal pixel unit with the plurality of nozzles corresponding to the normal pixel or the normal pixel unit.
S720, determining abnormal nozzles in the plurality of nozzles corresponding to the abnormal pixels or the abnormal pixel units through at least one comparison iteration.
Each pixel may be assigned a plurality of nozzles. By way of example, if three nozzles are allocated to each pixel opening, the nozzle corresponding to the abnormal pixel may be determined according to the correspondence between the position of the pixel or the pixel unit and the nozzle by the position of the abnormal pixel or the abnormal pixel unit. Among the plurality of nozzles corresponding to the abnormal pixel or the abnormal pixel unit, there is necessarily an abnormal nozzle, and therefore, the plurality of nozzles corresponding to the abnormal pixel or the abnormal pixel unit are compared with the plurality of nozzles corresponding to the normal pixel or the normal pixel unit. Searching the nozzles which are the same as the nozzles corresponding to the abnormal pixels or the abnormal pixel units from the nozzles corresponding to the normal pixels or the normal pixel units, and if the nozzles corresponding to the normal pixels or the normal pixel units and the nozzles corresponding to the abnormal pixels or the abnormal pixel units comprise one or more nozzles, the one or more nozzles are normal nozzles; if any one of the plurality of nozzles corresponding to the abnormal pixel or the abnormal pixel unit is not included in the plurality of nozzles corresponding to the normal pixel or the normal pixel unit, the one nozzle is continuously compared with the plurality of nozzles corresponding to the other normal pixels until the one nozzle is determined to be the abnormal nozzle or the normal nozzle.
In this embodiment, three nozzles and waveform parameters corresponding to the nozzles can be allocated to each pixel are exemplified. The correspondence between the pixel numbers and the pixel positions can be obtained by assigning the pixel numbers, nozzles and waveform parameters to the computer system according to the print job by referring to the following table.
Assignment information of the first pixel: the corresponding waveform parameters of the nozzles 1, 5 and 7 are waveform parameter 1 (nozzle 1), waveform parameter 7 (nozzle 5) and waveform parameter 8 (nozzle 7); assignment information of the second pixel: the corresponding waveform parameters of the nozzles 1, 3 and 7 are waveform parameter 1 (nozzle 1), waveform parameter 5 (nozzle 3) and waveform parameter 8 (nozzle 7); the nozzles to which the third pixel is assigned are nozzle 1, nozzle 5, and nozzle 7, respectively, and the corresponding waveform parameters are waveform parameter 1 (nozzle 1), waveform parameter 7 (nozzle 5), and waveform parameter 8 (nozzle 7). If the second pixel is determined to be an abnormal pixel according to the gray-scale image after ink dripping, the first pixel is a normal pixel, and the third pixel is a normal pixel. And comparing the allocation information corresponding to the second pixel with the allocation information corresponding to the first pixel and the allocation information corresponding to the third pixel in a variable control mode. Specifically, if the first pixel and the third pixel are normal pixels, it is indicated that the volumes of the ink output from the nozzles 1, 5 and 7 allocated to the first pixel and the third pixel are satisfactory, and the nozzles 1, 5 and 7 allocated to the first pixel are compared with the nozzles 1, 3 and 7 allocated to the second pixel, so that the nozzle 3 is determined to be an abnormal nozzle. Although the nozzle 3 corresponds to the waveform parameter 5, since there is a possibility that the nozzle 3 itself is clogged, it is not completely determined that the waveform parameter 5 is abnormal. However, if it has been confirmed that the nozzle 3 is clear and free of clogging before the start of the inkjet printing job, it can be determined that the waveform parameter 5 is abnormal.
For example, if the nozzle number used by the abnormal pixel is (X1, Y1, Z1) and the nozzle number used by the first normal pixel is (X1, Y2, Z2), it may be determined that the nozzle X1, the nozzle Y2, and the nozzle Z2 are normal, and further judgment is required for the nozzle Y1 and the nozzle Z1, and the nozzle Y1 and the nozzle Z1 are compared with other normal pixels. For example, if the nozzle number used for the second normal pixel is (X3, Y1, Z3), it is determined that the nozzle X3, the nozzle Y1, and the nozzle Z3 are normal, and thus the nozzle Z1 is determined to be an abnormal nozzle. Similarly, cases where the number of nozzles is greater than 3 or more may be passed through a more number of iterations to lock in an abnormal nozzle.
Illustratively, the first abnormal pixel uses the nozzle number (X1, Y1, Z1), the second abnormal pixel uses the nozzle number (X2, Y2, Z1), and since the first abnormal pixel and the second abnormal pixel each use the nozzle Z1, it is necessary to further compare the first abnormal pixel with other normal pixels to determine whether the nozzle Z1 is an abnormal nozzle. Similarly, cases where the number of nozzles is greater than 3 or more may be passed through a more number of iterations to lock in an abnormal nozzle.
It should be understood that, although the steps in the flowcharts of fig. 2b, 3a, 4, 5a, 6, 7 are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps of fig. 2b, 3a, 4, 5a, 6, 7 may comprise a plurality of sub-steps or phases, which are not necessarily performed at the same time but may be performed at different times, nor does the order of execution of the sub-steps or phases necessarily follow one another, but may be performed alternately or alternately with other steps or at least a portion of the sub-steps or phases of other steps.
In one embodiment, as shown in fig. 8, the present application provides a detection device for abnormal nozzles. The detection apparatus includes an acquisition module 810, an image position determination module 820, a pixel position determination module 830, an abnormal nozzle determination module 840, wherein:
the acquiring module 810 is configured to acquire a grayscale image of the pixel substrate, where the grayscale image includes a plurality of sub-grayscale images, and the sub-grayscale images correspond to pixels or pixel units on the pixel substrate one by one.
The image position determining module 820 is configured to determine a position of the abnormal sub-gray scale image according to the gray scale image.
The pixel position determining module 830 is configured to determine a position of an abnormal pixel or an abnormal pixel unit on the pixel substrate according to a position of the abnormal sub-gray level image.
The abnormal nozzle determination module 840 is configured to determine an abnormal nozzle according to a position of an abnormal pixel or an abnormal pixel unit.
In one embodiment, a mark point is disposed on the pixel substrate, the gray-scale image includes an image corresponding to the mark point, as shown in fig. 9, the detection device further includes a correspondence establishing module 910, where the correspondence establishing module 910 is configured to determine a position of each pixel or pixel unit on the pixel substrate according to a position of the mark point; determining the position of each sub-gray-scale image in the gray-scale image according to the position of the image corresponding to the mark point; and establishing a position corresponding relation between each sub-gray-scale image in the gray-scale image and each pixel or pixel unit on the pixel substrate.
Further, the pixel position determining module 830 is further configured to determine a position of an abnormal pixel or an abnormal pixel unit on the pixel substrate according to the position of the abnormal sub-gray level image and the position correspondence.
For specific limitations on the detection means of the abnormal nozzle, reference may be made to the above limitations on the detection method of the abnormal nozzle, and no further description is given here. The above-described respective modules in the abnormal nozzle detection apparatus may be implemented in whole or in part by software, hardware, or a combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, as shown in fig. 10, the present application provides a detection device for abnormal nozzles. The detection device comprises:
the optical inspection system 1010 is configured to obtain a grayscale image of a pixel substrate, where the grayscale image includes a plurality of sub-grayscale images, and the sub-grayscale images correspond to pixels or pixel units on the pixel substrate one by one.
A controller 1020 coupled to the optical inspection system for determining an abnormal sub-gray scale image from the gray scale image; determining the position of an abnormal pixel or an abnormal pixel unit on the pixel substrate according to the position of the abnormal sub-gray level image; and determining an abnormal nozzle according to the position of the abnormal pixel or the abnormal pixel unit.
In one embodiment, the controller 1020 is further configured to determine a location of each pixel or pixel cell on the pixel substrate based on the location of the marker point; determining the position of each sub-gray-scale image in the gray-scale image according to the position of the image corresponding to the mark point; and establishing a position corresponding relation between each sub-gray-scale image in the gray-scale image and each pixel or pixel unit on the pixel substrate.
Further, the controller 1020 is further configured to determine a position of an abnormal pixel or an abnormal pixel unit on the pixel substrate according to the position of the abnormal sub-gray level image and the position correspondence.
In one embodiment, a computer device is provided, which may be a terminal, and the internal structure thereof may be as shown in fig. 11. 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 includes a non-volatile 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 the operating system and computer programs in the non-volatile storage media. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program, when executed by a processor, implements a method of controlling an inkjet printing apparatus. 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, can also be keys, a track ball or a touch pad arranged on the shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like.
It will be appreciated by those skilled in the art that the structure shown in FIG. 11 is merely a block diagram of some of the structures associated with the present inventive arrangements and is not limiting of the computer device to which the present inventive arrangements may be applied, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.
In an embodiment, a computer device is provided comprising a memory and a processor, the memory having stored therein a computer program, the processor implementing the method steps of the above embodiments when the computer program is executed.
In an embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when being executed by a processor, implements the method steps of the above embodiments.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include non-volatile and/or volatile memory. The nonvolatile 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), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (9)
1. A method of detecting an abnormal nozzle, comprising:
acquiring a gray-scale image of a pixel substrate, wherein the gray-scale image comprises a plurality of sub-gray-scale images, and the sub-gray-scale images are in one-to-one correspondence with pixels or pixel units on the pixel substrate;
determining the position of an abnormal sub-gray level image according to the gray level image;
the pixel substrate is provided with marking points, and the gray-scale image comprises an image corresponding to the marking points;
Determining the position of each pixel or pixel unit on the pixel substrate according to the position of the marking point;
determining the position of each sub-gray-scale image in the gray-scale images according to the positions of the images corresponding to the mark points;
establishing a position corresponding relation between each sub-gray-scale image in the gray-scale image and each pixel or pixel unit on the pixel substrate; determining the position of an abnormal pixel or an abnormal pixel unit on the pixel substrate according to the position of the abnormal sub-gray level image;
and determining an abnormal nozzle according to the position of the abnormal pixel or the abnormal pixel unit.
2. The method of claim 1, wherein determining the location of the outlier pixel or outlier pixel element on the pixel substrate from the location of the outlier sub-gray-scale image comprises:
and determining the position of the abnormal pixel or the abnormal pixel unit on the pixel substrate according to the position of the abnormal sub-gray level image and the position corresponding relation.
3. The method of claim 1, wherein prior to the acquiring the grayscale image of the pixel substrate, the method further comprises:
acquiring size information of pixels or pixel units on the pixel substrate;
Setting a scanning range of optical scanning according to the size information of the pixels or the pixel units;
the acquiring the gray-scale image of the pixel substrate includes:
and acquiring a gray-scale image of the pixel or the pixel unit on the pixel substrate according to the scanning range of the optical scanning.
4. The method of claim 1, wherein determining the location of the outlier sub-gray scale image from the gray scale image comprises:
and comparing the sub-gray-scale images of the gray-scale images to determine the positions of abnormal sub-gray-scale images with defects.
5. The method of claim 4, wherein comparing each of the sub-grayscale images of the grayscale images to determine the location of an abnormal sub-grayscale image that is defective comprises:
comparing the gray scale values of the sub-gray scale images;
determining a sub-gray-scale image with abnormal gray-scale values according to the comparison result;
and determining the position of the abnormal sub-gray-scale image through the sub-gray-scale image with the abnormal gray-scale value.
6. The method according to claim 1, wherein a correspondence is provided between the position of the pixel or pixel unit and the nozzle;
The determining the abnormal nozzle according to the position of the abnormal pixel or the abnormal pixel unit comprises the following steps:
determining a plurality of nozzles corresponding to the abnormal pixels or the abnormal pixel units according to the corresponding relation between the positions of the pixels or the pixel units and the nozzles through the positions of the abnormal pixels or the abnormal pixel units;
and determining the abnormal nozzles in the plurality of nozzles corresponding to the abnormal pixels or the abnormal pixel units.
7. The method of claim 6, wherein the determining the abnormal nozzle among the plurality of nozzles corresponding to the abnormal pixel or the abnormal pixel unit comprises:
comparing the nozzles corresponding to the abnormal pixels or the abnormal pixel units with the nozzles corresponding to the normal pixels or the normal pixel units;
and determining the abnormal nozzles in the plurality of nozzles corresponding to the abnormal pixels or the abnormal pixel units through at least one comparison iteration.
8. An abnormal nozzle detection apparatus, the apparatus comprising:
the device comprises an acquisition module, a display module and a display module, wherein the acquisition module is used for acquiring a gray-scale image of a pixel substrate, the gray-scale image comprises a plurality of sub-gray-scale images, and the sub-gray-scale images are in one-to-one correspondence with pixels or pixel units on the pixel substrate;
The image position determining module is used for determining the position of the abnormal sub-gray level image according to the gray level image;
the pixel substrate is provided with marking points, and the gray-scale image comprises an image corresponding to the marking points; determining the position of each pixel or pixel unit on the pixel substrate according to the position of the marking point; determining the position of each sub-gray-scale image in the gray-scale images according to the positions of the images corresponding to the mark points; establishing a position corresponding relation between each sub-gray-scale image in the gray-scale image and each pixel or pixel unit on the pixel substrate;
the pixel position determining module is used for determining the position of an abnormal pixel or an abnormal pixel unit on the pixel substrate according to the position of the abnormal sub-gray level image;
and the abnormal nozzle determining module is used for determining the abnormal nozzle according to the position of the abnormal pixel or the abnormal pixel unit.
9. An abnormal nozzle detection apparatus, the apparatus comprising:
the optical inspection system is used for acquiring a gray-scale image of the pixel substrate, wherein the gray-scale image comprises a plurality of sub-gray-scale images, and the sub-gray-scale images are in one-to-one correspondence with pixels or pixel units on the pixel substrate;
The controller is connected with the optical inspection system and is used for determining an abnormal sub-gray-scale image according to the gray-scale image; the pixel substrate is provided with marking points, and the gray-scale image comprises an image corresponding to the marking points; determining the position of each pixel or pixel unit on the pixel substrate according to the position of the marking point; determining the position of each sub-gray-scale image in the gray-scale images according to the positions of the images corresponding to the mark points; establishing a position corresponding relation between each sub-gray-scale image in the gray-scale image and each pixel or pixel unit on the pixel substrate; determining the position of an abnormal pixel or an abnormal pixel unit on the pixel substrate according to the position of the abnormal sub-gray level image; and determining an abnormal nozzle according to the position of the abnormal pixel or the abnormal pixel unit.
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