CN115008901A - Method for detecting abnormal volume of ink filled in pixel pit in ink-jet printing - Google Patents
Method for detecting abnormal volume of ink filled in pixel pit in ink-jet printing Download PDFInfo
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- CN115008901A CN115008901A CN202210477145.5A CN202210477145A CN115008901A CN 115008901 A CN115008901 A CN 115008901A CN 202210477145 A CN202210477145 A CN 202210477145A CN 115008901 A CN115008901 A CN 115008901A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/07—Ink jet characterised by jet control
- B41J2/075—Ink jet characterised by jet control for many-valued deflection
- B41J2/08—Ink jet characterised by jet control for many-valued deflection charge-control type
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
- B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
- B41J29/393—Devices for controlling or analysing the entire machine ; Controlling or analysing mechanical parameters involving printing of test patterns
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
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Abstract
The invention discloses a method for detecting abnormal volume of ink filled in a pixel pit of an ink-jet printing display, and belongs to the technical field of printing display. In the invention, the change of the measured volume of the ink filled in the pixel pit caused by the evaporation of the solvent in the actual printing process is considered, so that a representative jet orifice is selected for observation in the off-line calibration stage, and the volume of the ink in the target pixel pit is detected for multiple times after the jet, so as to obtain the change relation between the volume value of the ink in the pixel pit and the evaporation time period under different ink volume jet values through fitting; in the on-line detection stage, the reference ink volume value in the pixel pit to be detected is obtained through calculation according to the reference change relation and is compared with the volume detection value, and therefore whether the pixel pit filling is abnormal or not is judged. Therefore, the printing quality of the printed substrate can be detected on line, the pixel pit filling defects can be detected, and abnormal jet holes and abnormal jet strokes can be traced, so that the method is particularly suitable for manufacturing high-resolution displays, electronic components and the like by utilizing ink-jet printing.
Description
Technical Field
The invention belongs to the technical field of printing display, and particularly discloses a method for detecting abnormal volume of filling ink in an ink jet printing display pixel pit.
Background
The ink jet printing technology has great advantages as an additive manufacturing process and is applied to the manufacturing of display panels. The method can accurately fill the organic solvent into the pixel pits of the substrate, saves more than 90% of functional materials, is particularly suitable for manufacturing large-area and high-precision panels due to the advantages of high manufacturing freedom, simple process and strong adaptability, and has obvious advantages compared with the current widely-applied evaporation process. The yield of the printed substrate manufactured by ink-jet printing can be improved, and the mass production application of the printed substrate is promoted to be the target of panel manufacturers and scientific research institutions all over the world.
The use of inkjet printing techniques for the manufacture of display substrates, while having natural advantages, still presents multiple challenges in the implementation. One of the key problems faced is that in the process of filling the pixel pits with large-scale arrayed liquid drops, the defect of filling the ink volume of the pixel pits caused by abnormal jet hole states is inevitable, so that the production substrate has a display defect or even falls into a defective product. Meanwhile, the distance between the nozzle and the substrate is required to be less than 1mm in the printing process, and the jet volume of the jet hole cannot be detected in real time. Therefore, on the premise of not influencing the production efficiency, the pixel pit filling volume is detected on line and the abnormal spray holes are traced in time in the printing process, the yield of the ink-jet printing process for producing the printing display substrate can be further improved, and the mass production of the ink-jet printing process in the manufacturing process of the display substrate is further promoted.
The prior art proposes some solutions for detecting the ink fill volume of a pixel pit, for example: the patent CN112757796A proposes a mode of utilizing a white light interferometer to detect the film thickness of a film-forming pixel pit to evaluate the ink-jet printing quality, but the calculation process is biased to theoretical calculation, and the detection efficiency problem in the actual production process and the influence of evaporation factors on the measurement of the ink filling volume of the pixel pit are not considered; patent CN110126467A adopts a detection method for detecting print defects and uniformity based on image uniformity, but due to the limitation of detection accuracy, only some significant defects can be detected. Further research shows that the technologies designed in the prior patents and literatures still have the following defects: on one hand, they often only propose that the volume detection of the film-forming pixel pits can be carried out by means of a white light interferometer, but do not consider the operable implementation method in the case of industrial large-scale array processing production and the measurement volume change caused by the evaporation of the solvent; on the other hand, although the efficiency of the detection can be improved by performing the full-page image detection by the optical detection device after the panel is manufactured, the method has limited detection precision and can only detect the obvious defects of the substrate.
Disclosure of Invention
Aiming at the defects and improvement requirements of the prior art, the invention provides a method for detecting abnormal volume of filling ink in an ink-jet printing display pixel pit, aiming at solving the technical problem that the detection result is inaccurate because the change of the measured volume caused by the evaporation of a solvent is not considered in the conventional detection method.
In order to achieve the above object, in a first aspect, the present invention provides a method for detecting abnormal volume of ink filled in a pixel pit of an inkjet printing display, including:
an off-line calibration stage:
respectively jetting different ink volumes to the target pixel pits;
waiting for the target pixel pit to pass through different evaporation time periods under each ink volume injection value; detecting and recording the volume value of the ink in the pit corresponding to the end of each evaporation period, and further fitting to obtain the change relation between the evaporation period and the volume value of the ink in the pixel pit;
and (3) an online detection stage:
selecting a pixel pit to be detected, and calculating the volume value of ink in the pit at the moment of printing completion; selecting a variation relation corresponding to the closest ink volume injection value from the variation relations calibrated off line according to the ink volume value as a reference variation relation;
carrying out ink volume detection on the pixel pit to be detected after a preset evaporation time period from the printing completion moment and recording an ink volume detection value;
substituting the preset evaporation time period into the reference change relation, and calculating to obtain a reference ink volume value in the pixel pit to be detected;
and if the deviation between the ink volume detection value and the reference ink volume value exceeds the error allowable range, determining that the pixel pit to be detected is abnormally filled, otherwise, determining that the filling is normal.
Further, the evaporation period is expressed in relation to the change in the ink volume value within the pixel pit as:
where k represents the order of the fitted curve, t represents the evaporation period,
represents the ink volume value obtained by detecting the evaporation time period t after j ink drops are jetted to the target pixel pit by the No. m jet orifice,
representing curve coefficients of a kth order function;
coefficient sequence of variation relations
The values of (d) are obtained by solving the following matrix:
wherein the content of the first and second substances,
respectively showing that the evaporation time t is passed after the m-th jet orifice sprays j ink drops to a target pixel pit and is measured by an optical detection device 1 ,t 2 ,...,t i The resulting ink volume value is detected, and n represents the number of detections.
Further, in the off-line calibration stage, the separately ejecting different ink volumes to the target pixel pits includes:
determining the minimum value V of the volume of ink drops ejected from an orifice, which meets the printing precision requirement min Maximum value V max And a volume minimum measure Δ V, based on V max ＝V min + M delta V determines the number M of the jet holes participating in off-line calibration;
selecting the volume of ejected ink drops closest to V min ,V min +ΔV,V min +2ΔV,...,V max The jet orifice is used as a jet orifice participating in offline calibration;
and respectively jetting different ink volumes to the target pixel pits by using the jet holes participating in offline calibration.
Further, if filling of the pixel pit to be detected is completed in one printing stroke, the ink volume value V in the pit is obtained at the printing completion moment p Equal to the product of the volume of the ink drops ejected by the corresponding jet orifice and the number of the ink drops;
find the nearest V p Ink volume jetting value V x Selecting V in the variation relation of the off-line calibration x Corresponding variation relation as reference variation relation
The reference ink volume value
Expressed as:
wherein the content of the first and second substances,
indicating the ink volume jetted value V x Corresponding change relationship, t pq Indicating the completion time of pit printing of the q-th column pixel, t bq Indicating the q-th row pixel pit for ink volume detectionAnd (6) measuring the time.
Further, if the pixel pit to be detected is filled in a plurality of printing strokes, the ink volume value in the pit at the printing completion time is equal to the product of the volume of ink drops ejected by the corresponding jet orifice in the last printing stroke and the number of drops and the ink volume value after the ink volume value in the pit is evaporated at the last printing stroke end time, wherein the evaporation time period of the ink volume value in the pit at the last printing stroke end time is the difference between the last printing stroke end time and the last printing stroke end time.
Further, if filling of the pixel pit to be detected is completed in a plurality of printing strokes, calculating the volume value of ink in the pit after each printing stroke is completed;
after the first printing stroke is finished, the volume value of the ink in the pit is
After the second printing stroke, the volume value of the ink in the pit is
……
After the final printing stroke is finished, the volume value of the ink in the pit is
Wherein the content of the first and second substances,
a fill ink volume indicating that the q-th column of pixel pits does not take into account evaporation at the end of the fq-th printing pass;
indicating the fq-th printing stroke end time of the q-th column pixel pit; v xfq An ink volume injection value which represents the closest ink volume in the pixel pit after the fq printing stroke is finished; f. of Vxfq Represents V xfq Corresponding changeA relationship;
the reference ink volume value
Expressed as:
wherein, t bq Indicating the timing of ink volume detection for the pixel pit of the q-th column.
Further, after the substrate is printed, ink volume detection is carried out on the printed pixel pits in a sampling detection mode, and the number w of pixel pit columns allowed to be detected at a time during sampling detection is as follows:
wherein, t l The allowable time of the pixel pit filling ink volume detection process under the requirement of panel production efficiency is considered; t is t s The time required for the completion of the scanning of the pixel pits in the field of view for the optical detection instrument used; a is the pixel pit row number in the visual field in single detection; t is t e To take account of the temporal redundancy required to optically detect instrument motion.
In a second aspect, the present invention provides an apparatus for detecting abnormal volume of filling ink into pixel pits in inkjet printing, comprising:
the off-line calibration module is used for respectively jetting different ink volumes to the target pixel pits; waiting for the target pixel pit to pass through different evaporation time periods under each ink volume injection value; detecting and recording the volume value of the ink in the pit corresponding to the end of each evaporation period, and further fitting to obtain the change relation between the evaporation period and the volume value of the ink in the pixel pit;
the online detection module is used for selecting a pixel pit to be detected and calculating the volume value of ink in the pit at the printing completion moment; selecting a variation relation corresponding to the closest ink volume injection value from the variation relations calibrated off line according to the ink volume value as a reference variation relation; carrying out ink volume detection on the pixel pit to be detected after a preset evaporation time period from the printing completion moment and recording an ink volume detection value; substituting the preset evaporation time period into the reference change relation, and calculating to obtain a reference ink volume value in the pixel pit to be detected; and if the deviation between the ink volume detection value and the reference ink volume value exceeds the error allowable range, determining that the pixel pit to be detected is abnormally filled, otherwise, determining that the filling is normal.
In a third aspect, the invention provides a tracing method for displaying abnormal jet orifices in ink jet printing, which is used for judging abnormal filling of pixel pits by adopting the abnormal detection method for filling ink volume in pixel pits in ink jet printing and displaying of the first aspect;
if the pixel pit is filled in one printing stroke, indicating that the jet hole for filling the pixel pit is abnormal; if the pixel pit filling is completed in a plurality of printing strokes, the one or more jet holes filling the pixel pit are abnormal.
In a fourth aspect, the present invention provides a computer-readable storage medium comprising a stored computer program, wherein the computer program, when executed by a processor, controls an apparatus on which the storage medium is located to perform a method for detecting abnormal ink volume filling for inkjet printing display pixel pit filling and/or a method for tracing to an abnormal orifice in inkjet printing display according to the third aspect.
Generally, by the above technical solution conceived by the present invention, the following beneficial effects can be obtained:
in the invention, the change of the measured volume of the ink filled in the pixel pit caused by the evaporation of the solvent in the actual printing process is considered, so that a representative jet orifice is selected for observation in the off-line calibration stage, and the volume of the ink in the target pixel pit is detected for multiple times after the ink is jetted so as to obtain the change relation between the volume value of the ink in the target pixel pit and the evaporation time period under different ink volume jetting values through fitting; in the on-line detection stage, the reference ink volume value in the pixel pit to be detected is obtained through calculation according to the reference change relation and is compared with the volume detection value, and therefore whether the pixel pit filling is abnormal or not is judged. Compared with the prior art that the evaporation of the solvent is not considered, so that the detection result is inaccurate, the method can detect the printing quality of the printing substrate on line, detect the volume defect of the ink filled in the pixel pits, trace the abnormal jet holes and the abnormal jet stroke by detecting the volume value of the ink filled in the pixel pits, and is particularly suitable for application occasions of manufacturing high-resolution displays, electronic components and the like by using an ink jet printing mode.
Drawings
FIG. 1 is a schematic flow chart of a method for detecting abnormal volume of ink filled in pixel pits in inkjet printing according to the present invention;
FIG. 2 is a second schematic flow chart of the method for detecting abnormal volume of ink filled in pixel pits for inkjet printing according to the present invention;
FIG. 3 is a schematic view of an ink drop observation provided by the present invention;
FIG. 4 is a diagram of an embodiment of a method for detecting an abnormal volume of ink filled into a pixel pit in an ink jet printing display provided by the present invention;
fig. 5 is a schematic diagram of a printing process provided by the present invention.
Detailed Description
In order to make the objects, system components, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
In the present application, the terms "first," "second," and the like (if any) in the description and the drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
Referring to fig. 1 and fig. 2, the present invention provides a method for detecting an abnormal volume of an ink filled in a pixel pit of an inkjet printing display, including an offline calibration phase and an online detection phase, wherein the offline calibration phase includes operations S1 and S2, and the online detection phase includes operations S3 to S5.
An off-line calibration stage:
in operation S1, different ink volumes are respectively ejected to the target pixel pits.
Referring to fig. 3, in the off-line calibration stage, a high power observation camera is used to perform volume observation on ink droplets ejected from all orifices of the nozzle for printing, so that the nozzle performs pre-ejection while maintaining the formal working frequency, and the high power observation camera is used to obtain the volume values of the ink droplets ejected from all the orifices.
According to a preset printing target, recording the volume V of the ink drop stably ejected by the mth jet orifice m Determining V that satisfies the printing accuracy requirement m Minimum value of (V) min And maximum value V max The corresponding ink drop volume is then at V min ～V max The nozzle holes of (1) are optional nozzle holes meeting the requirements of the printing target. Determining the minimum volume measurement value DeltaV, and determining the number of orifices M which can participate in formal printing according to the value, wherein DeltaV and M need to satisfy V max ＝V min + M.DELTA.V, determining the volume closest to V min ,V min +ΔV,V min +2ΔV,...,V max The number of the jet holes is 1-M according to the sequence of the observation volumes of the ink drops from small to large, and the corresponding observation volume of the ink drops is V 1 ～V M 。
Operation S2, waiting for the target pixel pit to pass through different evaporation periods at each ink volume ejection value; and detecting and recording the volume value of the ink in the pit corresponding to the end of each evaporation period, and further fitting to obtain the change relation between the evaporation period and the volume value of the ink in the pixel pit.
Referring to fig. 4, the screened M orifices are filled with a single drop and a plurality of drops, respectively, and J represents the maximum number of drops of the orifices filled in the pixel pits. Using the screened orifices, printing of 1, …, J drops is performed on the pixel pits to be printed respectively, and the measurement is performed during the evaporation period t 1 ,t 2 ,...,t i Volume value in the back pixel pit.
The No. m spray hole jet is measured by an optical detection devicej drops of ink are applied to the target pixel pit and then subjected to evaporation time period t 1 ,t 2 ,...,t i Detecting the volume value of the obtained ink
Curve fitting method is adopted to obtain the ink volume of the 1,2, …, M-shaped jet orifice in a pixel pit, and the measured ink volume is measured under the condition that a single pixel pit is filled with 1,2, … and J drops of ink
Continuously varying relationship to the evaporation period t:
where k represents the order of the fitted curve and needs to be obtained from empirical values. The volume of ink in the pixel pit is measured by the m-shaped jet orifice under the condition that a single pixel pit is filled with j drops of ink drops
Coefficient sequence of variation with evaporation time t
The values of (d) are obtained by solving the following matrix:
wherein the content of the first and second substances,
respectively indicates that the evaporation time t is passed after the m-th jet orifice sprays j ink drops to a target pixel pit and is measured by an optical detection device 1 ,t 2 ,...,t i The resulting ink volume value is detected, and n represents the number of detections.
It should be noted that the different ink volume injection values in the present invention refer to the volume of J ink droplets injected from M-numbered orifices, and for regular pixel pits, the volume required for each pixel pit is the same, at this time, the ink volume injection values exist in M × J groups, and each group of ink volume injection values corresponds to the variation relationship between the ink volume value in one pixel pit and the evaporation period. For irregular pixel pits, typically there are no more than three types of pixel pits for a panel, for example two, where there are 2M J groups of ink volume ejection values.
And (3) an online detection stage:
operation S3, selecting a pixel pit to be detected, and calculating an ink volume value in the pit at the printing completion time; and selecting the variation relation corresponding to the closest ink volume spraying value in the variation relations of the off-line calibration as a reference variation relation according to the ink volume value.
Referring to fig. 5, in the formal printing process, the nozzle fills the pixel pits according to a predetermined planned printing path, in the printing process, the nozzle is fixed, the substrate performs acceleration-uniform-deceleration reciprocating motion, after the filling of the corresponding row of pixel pits is completed, the nozzle moves by a predetermined planned distance to fill the remaining rows of pixel pits, and it is defined that the nozzle moves once in the formal printing process as the end of a printing stroke.
Under the condition that one printing stroke is filled with one row of pixel pits, the printing process needs to record the printing stroke ending time of each row of pixel pits, and the time t of the stroke ending corresponding to the qth row of pixel pits is recorded pq Time t for completion of detection of volume of filled ink in pixel pit of the column bq Let the theoretical ink drop volume filled in each pixel pit be V pq The volume value of the pixel pit filling ink is directly calculated according to the observation volume of the ink drop of the jet orifice participating in the jet and the jet times.
If the printing adopts a mixed printing mode that a row of pixel pits are filled by different printing jet holes in a plurality of strokes, the time of the end of each stroke of each row of pixel pits and the theoretical filling ink volume in the pixel pits after the stroke is ended need to be recorded.
Indicating that the q-th column pixel pit passes through the fq-th strokeThe theoretical fill ink volume in the printed pixel pit;
the time after the printing of the qth column pixel pit fq stroke is completed. Wherein order
The initial value of (2) is zero, namely, the timing is started after the printing of the first stroke of each row of pixel pits is finished, and the timing of each row of pixel pits is independently and respectively recorded.
After the substrate is printed, or after each printing stroke is finished, pixel pit filling ink volume online detection is carried out on the printed substrate, an optical detection instrument moves in the moving direction of a spray head to detect different columns of pixel pit filling ink volume values, a sampling detection mode needs to be adopted in actual production, and the pixel column number w allowing detection for a single time is as follows:
wherein t is l The allowable time of the pixel pit filling ink volume detection process under the requirement of panel production efficiency is considered; t is t s The time required for the completion of the scanning of the pixel pits in the field of view for the optical detection instrument used; a is the pixel pit row number in the visual field in single detection; t is t e To take account of the temporal redundancy required to optically detect instrument motion.
In the display substrate, the pixel pits in the same column have the same ink volume filling requirement, and the detection completion time and the detection volume value of the ink volume filling of any pixel pit in the column are used as the corresponding values of the pixel pits in the column during detection. Thus, a complete detection sequence is obtained:
for non-hybrid print pixel pits:
for mixed mode print pixel pits:
wherein V bq Fill ink volume, t, detected for pixel pit in column q bq And filling the q-th column of pixel pits with the time for completing the detection of the ink volume.
(1) In a non-mixed printing mode, filling of the pixel pit to be detected is completed in a printing stroke, and the volume value of ink in the pit is equal to the product of the volume of ink drops ejected by the corresponding jet orifice and the drop number at the end of the printing stroke.
Finding the volume value V of ink in pit closest to the end time of the printing stroke p Ink volume jetting value V x Further finding the ink volume injection value V x The volume value of the ink in the corresponding target pixel pit is in a change relation with the evaporation time period,
for the corresponding constant value of the curve:
(2) for the hybrid print mode, the pixel pits are calculated once per print pass:
....
it will be appreciated that the first printing pass of a pixel pit fills the drop volume to
Therefore, it is not only easy to use
After the second printing pass is completed, the second printing pass is filled with ink in a volume of
Namely the difference between the theoretical value of the volume of ink filled in the pixel pit after the second printing stroke and the theoretical value of the volume of ink filled in the pixel pit after the first printing stroke, wherein the actual volume of ink in the pixel pit is the ink filling volume of the stroke plus the volume value of the ink filled in the first printing stroke after the ink is evaporated
After the third printing pass is completed, the third printing pass is filled with ink in a volume of
Namely the difference between the theoretical value of the volume of ink filled in the pixel pit after the third printing stroke and the theoretical value of the volume of ink filled in the pixel pit after the second printing stroke, wherein the actual volume of ink in the pixel pit is the ink filling volume of the stroke plus the volume value of the ink filled in the second printing stroke after the evaporation
……
After the last printing stroke is finished, the actual ink volume in the pixel pit is as follows:
therefore, in the final detection, the reference value of the ink volume in the pixel pit is:
wherein V xfq Indicating the ink volume ejected value that is closest to the ink volume in the pixel well after the fq print pass for that column of pixel wells.
In operation S4, ink volume detection is performed on the pixel pit to be detected and an ink volume detection value is recorded for a predetermined evaporation period from the printing completion timing.
Operation S5, substituting the predetermined evaporation time period into the reference change relationship, and calculating to obtain a reference ink volume value in the pixel pit to be detected; and if the deviation between the ink volume detection value and the reference ink volume value exceeds the error allowable range, determining that the pixel pit to be detected is abnormally filled, otherwise, determining that the filling is normal.
Further, in a non-mixed mode, the abnormal nozzle hole participating in the pixel pit filling can be directly traced, and in the mixed mode, the abnormal nozzle hole exists in the nozzle hole sequence participating in the pixel pit filling.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method for detecting abnormal volume of ink filled in a pixel pit of ink-jet printing display is characterized by comprising the following steps:
an off-line calibration stage:
respectively jetting different ink volumes to the target pixel pits;
waiting for the target pixel pit to pass through different evaporation time periods under each ink volume injection value; detecting and recording the volume value of the ink in the pit corresponding to the end of each evaporation period, and further fitting to obtain the change relation between the evaporation period and the volume value of the ink in the pixel pit;
and (3) an online detection stage:
selecting a pixel pit to be detected, and calculating the volume value of ink in the pit at the moment of printing completion; selecting a variation relation corresponding to the closest ink volume injection value from the variation relations calibrated off line according to the ink volume value as a reference variation relation;
carrying out ink volume detection on the pixel pit to be detected after a preset evaporation time period from the printing completion moment and recording an ink volume detection value;
substituting the preset evaporation time period into the reference change relation, and calculating to obtain a reference ink volume value in the pixel pit to be detected;
and if the deviation between the ink volume detection value and the reference ink volume value exceeds the error allowable range, determining that the pixel pit to be detected is abnormally filled, otherwise, determining that the filling is normal.
2. The method for detecting abnormal volume of ink filled in a pixel pit of an ink jet printing display pixel pit as claimed in claim 1, wherein the variation relation between the evaporation time period and the volume value of ink in the pixel pit is expressed as:
where k represents the order of the fitted curve, t represents the evaporation period,
represents the ink volume value obtained by detecting the evaporation time t after j ink drops are jetted to the target pixel pit by the No. m jet hole,
representing curve coefficients of a kth order function;
coefficient sequence of variation relations
The values of (d) are obtained by solving the following matrix:
wherein the content of the first and second substances,
respectively showing that the evaporation time t is passed after the m-th jet orifice sprays j ink drops to a target pixel pit and is measured by an optical detection device 1 ,t 2 ,...,t i The resulting ink volume value is detected, and n represents the number of detections.
3. The method for detecting the abnormal filling ink volume of the ink jet printing display pixel pit as claimed in claim 1 or 2, wherein in the off-line calibration stage, the respectively ejecting different ink volumes to the target pixel pit comprises:
determining the minimum value V of the volume of the ink drop ejected from the jet orifice, which meets the printing precision requirement min Maximum value V max And a volume minimum measure Δ V based on V max ＝V min + M delta V determines the number M of the jet holes participating in off-line calibration;
selecting the volume of ejected ink drops closest to V min ,V min +ΔV,V min +2ΔV,...,V max The jet orifice is used as a jet orifice participating in offline calibration;
and respectively jetting different ink volumes to the target pixel pits by using the jet holes participating in offline calibration.
4. The method for detecting abnormal volume of filling ink into pixel pits in inkjet printing according to claim 2, wherein if filling of a pixel pit to be detected is completed within one printing stroke, the pixel pit to be detected has an ink volume value V in the pit at the time of completion of printing p Equal to the product of the volume of the ink drops ejected by the corresponding jet orifice and the number of the ink drops;
find the nearest V p Ink volume jetting value V x Selecting V in the variation relation of the off-line calibration x Corresponding variation relation as reference variation relation
The reference ink volume value
Expressed as:
wherein the content of the first and second substances,
indicating the ink volume jetted value V x Corresponding change relationship, t pq Indicating the completion time of pit printing of the q-th column pixel, t bq Indicating the timing of ink volume detection for the pixel pit of the q-th column.
5. The method for detecting abnormal volume of filling ink in a pixel pit for inkjet printing according to claim 2, wherein if filling of a pixel pit to be detected is completed in a plurality of printing strokes, the volume value of the ink in the pit at the printing completion time is equal to the product of the volume of ink droplets ejected from a corresponding nozzle hole in the last printing stroke and the number of the ink droplets, plus the volume value of the ink in the pit at the end time of the last printing stroke after the volume value of the ink in the pit is subjected to evaporation, wherein the evaporation period of the volume value of the ink in the pit at the end time of the last printing stroke is the difference between the end time of the last printing stroke and the end time of the last printing stroke.
6. The method for detecting the abnormal volume of the filling ink of the pixel pits for the ink-jet printing display according to claim 5, wherein if the filling of the pixel pits to be detected is completed in a plurality of printing strokes, the volume value of the ink in the pits after each printing stroke is completed is calculated;
after the first printing stroke is finished, the volume value of the ink in the pit is
After the second printing stroke is finished, the volume value of the ink in the pit is
……
After the last printing stroke is finished, the volume value of the ink in the pit is
Wherein the content of the first and second substances,
a fill ink volume indicating that the q-th column of pixel pits does not take into account evaporation at the end of the fq-th printing pass;
indicating the fq-th printing stroke end time of the q-th column pixel pit; v xfq An ink volume jetting value representing the closest ink volume in the pixel pit after the fq printing stroke is finished; f. of Vxfq Represents V xfq Corresponding variation relation;
the reference ink bodyProduct value
Expressed as:
wherein, t bq Indicating the timing of ink volume detection for the pixel pit of the q-th column.
7. The method for detecting the abnormal volume of the filled ink of the pixel pits in the inkjet printing display according to claim 1, wherein after the substrate is printed, the ink volume of the printed pixel pits is detected by adopting a sampling detection mode, and the number w of the pixel pit columns which are allowed to be detected at a time in the sampling detection is as follows:
wherein, t l The allowable time of the pixel pit filling ink volume detection process under the requirement of panel production efficiency is considered; t is t s The time required for completing the scanning of the pixel pits in the visual field for the optical detection instrument used; a is the number of pixel pit columns in a visual field during single detection; t is t e To take account of the temporal redundancy required to optically detect instrument motion.
8. An abnormal detection device for filling ink volume in pixel pits of ink-jet printing display is characterized by comprising:
the off-line calibration module is used for respectively jetting different ink volumes to the target pixel pits; waiting for the target pixel pit to pass through different evaporation time periods under each ink volume injection value; detecting and recording the volume value of the ink in the pit corresponding to the end of each evaporation period, and further fitting to obtain the change relation between the evaporation period and the volume value of the ink in the pixel pit;
the online detection module is used for selecting a pixel pit to be detected and calculating the volume value of ink in the pit at the printing completion moment; selecting a variation relation corresponding to the closest ink volume injection value from the variation relations calibrated off line according to the ink volume value as a reference variation relation; carrying out ink volume detection on the pixel pit to be detected after a preset evaporation time period from the printing completion moment and recording an ink volume detection value; substituting the preset evaporation time period into the reference change relation, and calculating to obtain a reference ink volume value in the pixel pit to be detected; and if the deviation between the ink volume detection value and the reference ink volume value exceeds the error allowable range, determining that the pixel pit to be detected is abnormally filled, otherwise, determining that the filling is normal.
9. A tracing method for displaying abnormal jet orifices in ink-jet printing is characterized in that the abnormal filling of pixel pits is judged by adopting the abnormal detection method for filling ink volume in the pixel pits in the ink-jet printing according to any one of claims 1 to 7;
if the pixel pit is filled in one printing stroke, indicating that the jet hole for filling the pixel pit is abnormal; if the pixel pit filling is completed in a plurality of printing strokes, the one or more jet holes filling the pixel pit are abnormal.
10. A computer-readable storage medium comprising a stored computer program, wherein when the computer program is executed by a processor, the computer program controls a device on which the storage medium is located to execute an inkjet printing display pixel pit filling ink volume anomaly detection method according to any one of claims 1 to 7 and/or an inkjet printing display anomaly ejection hole tracing method according to claim 9.
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