KR20170091016A - Compression data structure, method for compressing print data using the same, and method for printing - Google Patents

Abstract

Provided are a compression data structure capable of simply modifying data after compression when there is a modification in print data, and a print data compression method using the same, and a printing method. A compressed data structure which includes a number of droplet discharge data, the position of each of the plurality of droplet discharge data, and a droplet discharge amount at each position is used. The print data compression method which includes a division step of dividing print data, which is a map of the discharge timing of the droplets, into predetermined sections, and the position of a nozzle for discharging the droplets, and a compression step of compressing the print data of the predetermined sections into the compressed data structure, is used.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressed data structure, a method of compressing print data using the compressed data structure,

The present invention relates to a compressed data structure, a print data compression method and a printing method using the same. More particularly, the present invention relates to a compressed data structure for applying droplets, a print data compression method and a printing method using the compressed data structure.

As a method of manufacturing a device such as a color filter of a liquid crystal display or an organic EL display, there is a method using an inkjet. That is, the liquid material containing the functional material is discharged as droplets from a plurality of nozzles of the inkjet, thereby forming a film of the functional material on the object to be coated.

In this inkjet method, the ejection pattern is treated as print data. The print data to be used is switched according to the lot change of the application to be coated or the change of the state of the inkjet nozzle. This enables flexible production.

In a liquid crystal display or an organic EL display, large-screen and high-definition are progressing, and an ink-jet printing apparatus for manufacturing them needs to cope with high-precision printing. In such a large-sized and high-precision discharge pattern, the capacity of the print data used for printing becomes large, and the capacity of the memory for holding the print data and the transfer time of the data become a problem. For this reason, a configuration in which print data is compressed and transmitted, and thawing is performed in order at the time of printing is generally used.

As a data compression method as described above, a compression method using a run length method such as a Pack Bits method which can be decompressed with a simple logic is widely used (for example, patent See Document 1).

Japanese Patent Application Laid-Open No. 2004-274509

However, in the conventional compression method using the run-length method, there is a problem that data after compression can not be modified when data is modified.

Particularly in an inkjet printing apparatus, it is necessary to correct print data in accordance with a change in the state of the nozzles such as positional deviation and clogging, though it is about several percent in the entire print data. In the conventional compression method using the run-length method, there is a problem as described above. Therefore, in order to correct data of only about several percent, it is necessary to correct the entire print data and perform compression and transmission. As a result, the operation rate of the equipment is greatly affected. When mass production is considered, it becomes a big problem.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a compressed data structure capable of simply modifying compressed data when a modification is made to the print data, and a print data compression method and a printing method using the compressed data structure.

In order to solve the above problems, a compressed data structure including a number of droplet ejection data, a position of each of the plurality of droplet ejection data, and a droplet ejection amount at each position is used.

Further, a compressed data structure including the number of the plurality of droplet ejection data, the respective positions of the plurality of droplet ejection data, and the additional information at the respective positions is used.

A dividing step of dividing the print data, which is a map of the ejection timing of the droplets and the nozzle position at which the droplets are ejected, into a predetermined section; and a compression step of compressing the print data of the predetermined section in the compressed data structure A print data compression method.

In addition, a print data read-in step of reading a print pattern, which is information of a bank of a panel to be printed, a non-discharge nozzle complementing step of complementing the clogged nozzle with another nozzle, and a misalignment of the droplet discharged from the nozzle And a print data generating step of generating print data from the print data reading step, the non-discharge nozzle supplementing step, and the positional displacement correcting step, A printing method comprising: a compression step of compressing data; a transfer step of transferring the compressed data to an inkjet head; a defrosting step of defrosting the transferred compressed data and defrosting the compressed data into the print data; And a printing process for printing on the recording medium.

According to the present invention, data can be compressed and decompressed with simple logic, data can be rewritten in a compressed state, and even if non-contiguous data exists, compression can be performed without lowering the compression ratio.

1 is a block diagram of a droplet ejection process of the inkjet printing apparatus according to the first embodiment.
2 is a diagram showing print data used in the inkjet printing apparatus according to the first embodiment.
3 (a) is a view showing print data in the first embodiment, FIG. 3 (b) is a view showing print data obtained by performing the nozzle supplement process with the print data of FIG. Fig. 8 is a diagram showing print data corrected for positional deviation by print data. Fig.
Fig. 4 is a diagram showing (a) compressed data in the case of compressing the print data of Fig. 3 (a) by Pack Bits, (b) compressed data in the case of compressing the print data of Fig. And FIG. 3C is a diagram showing compressed data in the case where the print data of FIG. 3C is Pack Bits compressed.
5 is a flow chart of the droplet ejection process of the inkjet printing apparatus using the conventional image compression method (a) to (b).
6 is a circle graph showing the ratio of ejection pixels of the print data in Fig.
7 is a diagram showing a first structure of compressed data according to the first embodiment;
8 is a diagram showing a second structure of the data for compression according to the first embodiment.
9 is a graph showing the compression section length and the ratio of the ejection pixels in the first embodiment.
Fig. 10 is a diagram showing (a) compressed data when the print data of Fig. 3A is compressed by using the image compression method of the first embodiment, (b) the print data of Fig. (C) compression when the print data of Fig. 3 (c) is compressed using the image compression method of the first embodiment. Fig. Fig.
Fig. 11 is a diagram showing (a) compressed data when the print data of Fig. 3A is compressed by using the image compression method of the second embodiment, (b) the print data of Fig. (C) compression when the print data of Fig. 3 (c) is compressed by using the image compression method of the second embodiment. Fig. Fig.
12 is a flowchart showing the operation of the inkjet printing apparatus according to the third embodiment in the case of (a) - (b) using the image compression method according to the first and second embodiments.
13 is a diagram showing a compressed data structure by the image compression method according to the fourth embodiment

One embodiment of the present invention will be described below with reference to the drawings. Hereinafter, the embodiments are merely examples, and the present invention is not limited thereto.

(Embodiment Mode 1)

Hereinafter, one embodiment of the image compression method and the image compression system according to the first embodiment will be described with reference to the drawings.

(Configuration of Discharge Circuit)

1 is a block diagram of a discharge circuit of an ink-jet printing apparatus according to the first embodiment.

First, the block diagram of Fig. 1 and the components of the inkjet printing apparatus will be described.

There is a substrate 101 to be printed. And a bank 101a (concave portion) formed on the substrate 101. [ The banks 101a are arranged on the substrate 101 at a constant pitch with respect to the print scanning direction x. The print scanning direction x is a direction in which the substrate 101 and the inkjet head 102 move relative to each other.

One or a plurality of inkjet heads 102 are arranged in a line y in a direction orthogonal to the print scanning direction x. The ink jet head 102 has a plurality of nozzles 102a. The plurality of nozzles 102a are arranged in a direction (y) orthogonal to the print scanning direction (x).

The print data generating unit 103 includes a print data generator 103a, a print data compressor 103b, and a print data transmitter 103c.

The inkjet head control unit 104 includes a print data receiver 104a, a print data holding memory 104b, a position detector 104c, a print timing generator 104d, a drive signal generator 104e, a print data extractor 104f, , And a drive signal selector 104g.

(Operation of Discharge Circuit)

Next, the operation of the inkjet printing apparatus will be described.

First, the flow of data from generation to transmission of print data will be described first.

The print data generator 103a of the print data generating unit 103 generates design information of the substrate 101 to be printed and clogging information of the nozzles of the ink jet head 102 and positional deviation information of ink ejection from the nozzles The print data for printing is generated.

The print data compressor 103b compresses the print data generated by the print data generator 103a, and generates print data after compression.

The print data transmitter 103c transmits the compressed print data generated by the print data compressor 103b to the print data receiver 104a in the inkjet head control unit 104. [

The print data receiver 104a stores the compressed print data received from the print data transmitter 103c in the print data holding memory 104b.

Next, the flow of data at the time of printing will be described.

At the time of printing, the substrate 101 to be printed moves relative to the ink jet head 102 in the x direction. At this time, the position detector 104c of the inkjet head control unit 104 detects a change in the relative position of the substrate 101, and generates a timing pulse corresponding to the relative positional change.

The print timing generator 104d divides the timing pulses output from the position detector 104c based on the print resolution Rx and specifies the generation timing of the voltage waveform for driving the nozzle 102a of the inkjet head 102 And outputs the generated print timing signal.

The drive signal generator 104e outputs the drive waveform of the nozzle 102a of the ink jet head 102 based on the print timing signal generated by the print timing generator 104d.

The print data explorer 104f reads and decompresses the compressed print data stored in the print data holding memory 104b one row at a time based on the print timing signal generated by the print timing generator 104d, And generates print data.

The drive signal selector 104g turns on / off the nozzle drive waveform sent from the drive signal generator 104e on / off for each nozzle based on the print data sent from the print data exploder 104f, The presence or absence of the discharge of the ink cartridge 1 is controlled.

(Explanation of Printed Image and Nozzle Complement / Offset Correction)

Next, nozzle correction and positional shift correction performed in accordance with the change of the nozzle state and the format of the print data used in the first embodiment will be described.

Fig. 2 is a conceptual diagram of print data used in the first embodiment.

The longitudinal direction in Fig. 2 is referred to as a row. This row is in the same direction as the printing operation direction (x) in Fig. The horizontal direction in Fig. 2 is taken as a row. This row is the same direction as the direction (y) orthogonal to the print scanning direction in Fig. Note that the lattice in Fig. 2 represents the pixels of the print data, "1" represents the ejection pixel, and "0" represents the non-ejection pixel.

The column direction is a scanning direction in which the nozzle 102a relatively moves with respect to the substrate 101. [ Therefore, the column direction indicates the ejection timing of the droplets from the nozzle 102a. The row direction is the direction of the arrangement of the nozzles 102a. As a result, the print data in Fig. 2 is two-dimensional data or map composed of the ejection nozzle 102a and the ejection timing.

Here, the ejection pixel " 1 " in Fig. 2 is arranged in accordance with the position of the bank 101a of the panel to be printed in Fig. 1 and the number of ejection pixels " 1 " is required in accordance with the amount of ink supplied to the bank 101a . For example, it may be set to 2 in the case of discharging a double amount. Although the image compression method according to the first embodiment corresponds to compression other than binary information of "1" and "0", a black-and-white image of only "1" and "0" I do.

Figs. 3 (a) to 3 (c) are conceptual diagrams of nozzle compensation and positional shift correction performed in the inkjet printing apparatus used in the first embodiment.

3 (a) shows print data before the nozzle complementary / positional shift correction, and 128 data from 0 to 15th column, 0th to 7th row in Fig. 2 are extracted as an example.

Fig. 3 (b) is an image obtained when the nozzles of the second, eighth, and fifteenth columns of the image of Fig. 3 (a) are clogged and the nozzle complementary process is performed. In this case, the substrate 101, which is the panel of Fig. 1, is obtained by replacing the second column by the nozzle of the first column, the column by the seventh column and the column of the 15th column by the nozzle of the 14th column, The amount of ink to be supplied into the bank 101a, which is a pixel of the first embodiment, is supplemented.

Fig. 3 (c) shows a case in which the position of the liquid droplets ejected from the nozzles in the second column, the eighth column and the 15th column of the image in Fig. 3 (a) And is an image obtained when the positional deviation correcting process is performed. Here, it is assumed that the position of one pixel is displaced in the longitudinal direction in the second column, the eighth column, and the fifteenth column, and the positional deviation when the panel is landed is canceled by advancing the ejection timing by one row.

(A description of a conventional method by way of example of a pack bit compression method)

Here, the Pack Bits scheme, which is one of the conventional compression methods using the run-length method, will be described with reference to Figs. 4 (a) to 4 (c). Here, a description will be given of a change in an image after compression when nozzle supplementation and positional displacement correction, which are peculiar operations in an inkjet printing apparatus, are performed.

Here, the Pack Bits compression method will be briefly described. The Pack Bits compression method is a compression method based on the run length method. In this compression, compression is performed by replacing consecutive data with a data structure such as " number " and " value " of data. In this case, when the data is continuous, the above-mentioned "number" is described as "-1 × the number of consecutive data + 1". When the data is not continuous, the above-mentioned "number" is described as "the number of non-consecutive data-1".

Since the above-described " number " is described in 1 byte, if the number of data exceeds 129, either continuous or discontinuous, it is divided and recorded.

Figs. 4 (a) to 4 (c) are compressed data in the case of Pack Bits compression of Figs. 3 (a) to 3 (c). 4A shows the print data before the nozzle complementary / positional deviation correction, FIG. 4B shows the print data after the nozzle complementary, FIG. 4C shows the positional deviation (FIG. Corrected print data. Figures 4 (a) to 4 (c) are described as a one-dimensional array, and subscripts in the data indicate the array numbers.

In this case, it is assumed that the compressing process is sequentially performed from the upper left side to the lower side of the image, and if the 15th row is performed in the lateral direction, the 0th column of the next row is read, and compression is not performed on a row-by-row basis.

4 (a), the compression using the pack bit system will be briefly described. Fig. 4 (a) is a result of compressing Fig. 3 (a), and therefore will be described with reference to Fig. 3 (a). The data in the 0-th row and the 0-th column on the upper left in Fig. 3 (a) are "0" and continue to the 15-th row in the 0-th row. Therefore, the number of data after compression is obtained by "-1 × 16 + 1", and the value of the data is "0", so that "-15" representing the number of data is entered in the 0th , And " 0 " indicating the value of the data is included in the first. Likewise, since four "1" s are continuous from the first row to the first column to the first row and the third column in FIG. 3A, "-3" is entered into the second one in FIG. 4A, " By repeating the same process, the data shown in Fig. 3 (a) is compressed with the data shown in Fig. 4 (a).

Next, with reference to Figs. 4 (b) and 3 (b), a description will be given of the results obtained when Pack Bits compression of an image after nozzle complementation is performed. In Fig. 3 (b), since the nozzles are supplemented, the data of the 0th line, the 1st line, the 5th line, and the 6th line change in Fig. 3 (a) and Fig. 3 (b). In the 0th line of Fig. 3 (b), " 1 " is entered in the 1st, 7th and 14th columns, and the continuous data is divided. 1 "," 0 "," 1 "," 1 "," 1 "," 1 "," 1 " 7 compressed data. For this reason, the data from the 0th to the thirteenth in Fig. 4 (b) are 14 data in total. 4 (a), the data length after compression is increased by 12. Since the number of data after compression changes by changing the distribution of data as described above by the nozzle complementation, the number of data after the nozzle complementation in Fig. 4B is 26 when there is no nozzle complementation, .

Next, with reference to Figs. 4 (c) and 3 (c), a description will be given of the results obtained when Pack Bits compression of an image after positional shift correction is performed. In Fig. 3 (c), since the positional deviation correction is performed, the data of the 0th row, the 1st row, the 5th row, and the 6th row in Fig. 3 (c) change. 0 " is 2, " 1 " is 1, and " 0 " is 0 because the continuous data is divided by " 1 & (Including the 0th and the 1st columns of the next row), and a total of 6 pieces of compressed data are obtained.

For this reason, the data from the 0th to the 11th in Fig. 4 (c) are 12 data in total. As a result, as compared with Fig. 4A, the data length after compression increases by six. As described above, the distribution of data is changed by the positional shift correction, so that the number of data after compression changes. For this reason, the number of data after the nozzle supplementation in Fig. 4 (c) is 58 in comparison with 26 in the case of no nozzle supplementation.

As described above, in the compression method using the run-length method (Pack Bits method), compression is performed by using the continuity of data. Therefore, when the continuity of data is changed by performing nozzle compensation or positional shift correction, the data length changes . Therefore, when nozzle compensation or positional displacement correction is performed, it is necessary to again compress the entire data again.

(Process in conventional printing)

Figures 5 (a) to 5 (b) illustrate the operation of an inkjet printer using Pack Bits compression, which is a conventional compression method. Fig. 5 (a) shows the operation flow at the time of first printing, and Fig. 5 (b) shows the operation at the time of non-discharge compensation and positional displacement correction change.

First, Fig. 5 (a) will be described.

In the print data reading step 501, a print pattern created based on the design information of the bank 101a, which is the pixel of the substrate 101 that is the panel to be printed, is read. The print pattern is the bank 101a on the substrate 101, its position, its size, and the like.

In the non-discharge nozzle supplementing process 502, as described with reference to FIG. 3 (b), the clogged nozzle is supplemented with the other nozzle or nozzles in the vicinity of the print data of the print data reading process 501, The amount of ink supplied to the bank 101a serving as the pixel of the substrate 101 is compensated.

In the positional deviation correcting step 503, as described in Fig. 3 (c), in the case where the position when the droplet discharged from each nozzle is misaligned in the longitudinal direction, the ejection timing of the ink is changed The positional deviation is canceled.

In the compression step 504, the print data is compressed by using the conventional method Pack Bits compression method as described in FIG. 4 to create compressed data.

In the transfer step 505, the compressed data is transferred from the print data generation unit 103 of Fig. 1 to the inkjet head control unit 104. [

In the defrosting process and the printing process 506, a defrosting process for defrosting the compressed data into print data and a defrosting process for defrosting the defrosting process by the defrosted print data in accordance with the movement of the substrate 101, And printing.

Next, FIG. 5 (b) shows a process flow at the time of non-discharge compensation and positional displacement correction modification. As described in Fig. 4, in the Pack Bits compression method which is a conventional compression method, when a process in which the continuity of data such as the non-discharge correction and the positional shift correction changes is performed on an image, the data length after compression changes , And when nozzle compensation or positional displacement correction is performed, it is necessary to again compress the entire data again. Therefore, in the case of using the Pack Bits compression method, which is a conventional compression method, at the time of changing the non-discharge compensation and the positional displacement correction, the same operation as in Fig. 5A is performed, .

(The concept of the compression method of the first embodiment and the description of the data structure)

The basic concept of the compression method according to the embodiment will be described. Fig. 6 is a circle graph showing the ratio of the ejection pixels in the print data of Fig. In the figure, "1" represents a discharge pixel, and "0" represents a non-discharge pixel. 0 " is 92% with respect to 8% of the ratio of the discharge pixel " 1 ", and it can be seen that the non-discharge pixel " 0 " is overwhelmingly large.

The reason is as follows. In the inkjet printer according to the first embodiment, as described in Fig. 3 (c), the positional shift of the landing position of the droplet discharged from each nozzle in the x direction is corrected by the ink ejection timing. Therefore, the resolution in the x direction of the printer is set to a sufficiently small value such as about 1 / 60th of the pixel pitch in the x direction of the printing object. As a result, since the setting is small, the number of non-ejecting pixels " 0 " increases.

In the image compression method according to the first embodiment, compression is performed using the deviation of the existence of the ejection data and the non-ejection data peculiar to the inkjet printer included in the first embodiment.

Here, the ejection data is droplet ejection data indicating ejection of a droplet, and may include a droplet amount.

Thus, in the image compression method of the first embodiment, the non-ejection pixel " 0 " That is, it is assumed that the non-ejecting pixel " 0 " The data length is compressed by recording only the information of the discharge pixel " 1 ". The print data is divided into a predetermined length called a compression section length, and the data length is compressed by recording the number of discharge pixels " 1 " in the divided data and the position and value of each discharge data. The compression section length is determined in advance before compression according to the amount of memory capable of securing the compressor and the thawing machine, and a common value is used for compression and thawing.

Here, the compression section length is a length when the data is divided and processed for each predetermined section. However, the compression section length is preferably determined according to the amount of information that can be processed by the controller. Therefore, when the amount of information that can be processed by the controller is larger than the total amount of information, the entire processing may be performed once.

In this compression method, data is initialized to non-ejection data after securing a data region of the compression section length at the time of defrosting, and data initialized with the non-ejection data based on the relative position and value of each ejection data in the compressed data By overwriting the discharge data within the area, the data before compression is restored. Since this thawing step is a step of placing a discharge pixel point in a space filled with non-discharge pixel information, the image compression method of the first embodiment is referred to as Put Bits compression.

(Data structure of the embodiment, data compression method)

Fig. 7 shows a data structure and compression method of Put Bits compression which is the image compression method of the first embodiment.

First, the compression section is determined as described above. That is, next, print data is compressed with the following data structure.

The data structure has, at the beginning, the number of discharge pixels " 1 " in a predetermined compression section, that is, the number 701 of droplet discharge data. Next, there is a relative position 702 based on the head of each section of the first discharge pixel " 1 ". Next, there is the value of the first discharge pixel " 1 ", that is, the droplet discharge amount 703. And a relative position 704 based on the head of each section of the second discharge pixel " 1 ". The value of the second discharge pixel " 1 ", and the droplet discharge amount 705. [ there is a relative position 706 based on the head of each section of the n-th discharge pixel " 1 ". the value of the n-th discharge pixel "1", and the droplet discharge amount 707.

Here, the order of describing each discharge pixel may not necessarily be an ascending order or a descending order.

In the image compression method of the first embodiment, the data capacity (l _c ) after compression can be obtained by the following expression (1).

Here, the data capacity (l _e ) before compression, the compression section length (n), and the ratio (p) of the discharge pixel " 1 "

The compression ratio (r _c ) is obtained by dividing the data capacity (l _e ) before compression by the data capacity (l _c ) after compression.

Here, it is the compression ratio (r _c ) of the data. From the equation (2), it can be seen that the compression ratio of the compression method of the first embodiment is determined by the compression section length (n) and the ratio (p) of the discharge pixel "1" in the compressed image.

In order compression scheme of the first embodiment is to function effectively as a data compression method, since the at least r _c> requires 1, the following expression is satisfied.

That is, in order for the image compression method of the first embodiment to effectively function as data compression, the relationship between the compression section length n and the ratio p of the ejection pixel " 1 " There is a need.

Fig. 9 shows a graph of Equation (3). 9 is the ratio (p) of the discharge pixel " 1 ", and the abscissa is the compression section length (n). 9, when the compression section length n increases, the ratio p of the ejection pixel " 1 " From this, it can be understood that the ratio of the non-ejecting pixels " 0 " in the print data to be compressed is at least 50% or more in order for the image compressing method of the first embodiment to effectively function as data compression.

The compression section length n is calculated based on the data of the relative positions 702, 704, and 706 based on the head of each section of the first discharge pixel " 1 " The compression rate can be increased by dividing one data position and recording the position of a plurality of data.

For example, when the compression section length (n) is 16 bytes and the data type of the data position is 1 Byte due to hardware constraints at the time of compression and decompression, 1 byte indicating the data position can represent 256 data positions of 0 to 255 have. However, in this case, since the data position is only required to represent 16 data positions from 0 to 15, the remaining 16 to 255 are useless.

Thus, as shown in FIG. 8, one byte of the data position is divided into upper and lower 4 bits, and 16 pieces of position information of 0 to 15 are recorded. As a result, two data positions can be recorded in one byte, so that the recording density can be increased and the compression ratio can be improved.

Here, the discharge pixel " 1 " in the predetermined section is the number 701 of droplet discharge data. The relative position based on the head of each of the first and second discharge pixels " 1 " is the relative position 802. The value of the first discharge pixel "1" is the droplet discharge amount 803. The value of the second discharge pixel "1" is the droplet discharge amount 804. The relative position based on the head of each of the third and fourth discharge pixels " 1 " is the relative position 805. The value of the third discharge pixel "1" is the droplet discharge amount 806. The value of the fourth discharge pixel " 1 " is the droplet discharge amount 807. [ and the relative position based on the head of each of the n-th and (n + 1) -th discharge pixels "1" is the relative position 808. The value of the n-th discharge pixel "1" is the droplet discharge amount 809. The value of the (n + 1) th discharge pixel "1" is the droplet discharge amount 810.

(Explanation when collectively compressing the entire image by the compression method of the first embodiment)

Here, Put Bits compression, which is the image compression method of the first embodiment described with reference to Fig. 7, will be described with reference to Figs. 10 (a) to 10 (c).

Figs. 10 (a) to 10 (c) are data obtained by compressing Put Bits compression, which is the image compression method of the first embodiment, in Figs. 3 (a) to 3 (c).

10 (b) shows print data after nozzle supplementation, and Fig. 10 (c) shows the positional deviation (positional deviation) Corrected print data.

10 (a) to 10 (c) are described as a one-dimensional array, and subscripts in the data indicate array numbers.

In this case, it is assumed that the compression process is sequentially performed from the upper left side to the lower side of the image, and the 0th column of the next row is read when the 15th column is performed in the lateral direction in order to collect data.

10 (a), a compression process using Put Bits compression, which is an image compression method according to the first embodiment, will be briefly described. Fig. 10 (a) is a result of compressing Fig. 3 (a), and therefore will be described with reference to Fig. 3 (a). Here, the compression section length in Put Bits compression, which is the image compression method of the first embodiment, is 128. [ In FIG. 3A, there are 128 data in total. Among them, the non-ejecting pixels " 0 " exist in the first row and the sixth row, and the fourth, fourth, sixth, Four, from the 12th to the 15th, in total 24.

Therefore, " 24 " is recorded as the number of data in the compression section in the 0 < th > data of Fig. 10A, and then the relative position and value of each data from the 0 & Here, the discharge pixel " 1 " in the first row and the 0th column in Fig. 3A will be described as an example. Since the data of the first row and the 0th column of Fig. 3 (A) counts from the 0th row to the 16th data counted from the 0th column to the right, the data position "16" is recorded in the first data of Fig. 10 , And the data value " 1 " is recorded in the second data.

In Fig. 3 (a), by performing the same process for the remaining 23 data, the result of Fig. 10 (a) is obtained and 128 data are compressed into 49 data.

Next, with reference to Figs. 10 (b) and 3 (b), a description will be given of the results obtained when the image compressed by Put Bits, which is the image compression method of the first embodiment, is supplemented with a nozzle. In Fig. 3 (b), since the nozzles are supplemented, the data of the 0th line, the 1st line, the 5th line, and the 6th line change in Figs. 3 (a) and 3 (b). In the 0th and 1st rows of Fig. 3A, the ejection pixel " 1 " is shifted from the 1st row to the 2nd row to the 0th row and the 1st column, from the 1st row to the 8th column to the 0th row and the 7th column, And moves from the 15th to the 0th row and the 14th column.

In the fifth and sixth rows, the ejection pixels " 1 " move from the sixth row to the second column to the fifth row and the first column, from the sixth row to the eighth column to the fifth row and seventh column and from the sixth row to the 15th column to the fifth column and the fourteenth column. As described above, when one pixel changes from the ejection pixel "1" to the non-ejection pixel "0", the non-ejection pixel "0" in the vicinity changes to the ejection pixel.

This operation can be directly performed on the compressed data in Put Bits compression which is the image compression method of the first embodiment. Fig. 10 (b) shows the result of nozzle compensation performed in Fig. 3 (b) with respect to the compressed data in Fig. 10 (a). The triangular display on the subscript of each data in Fig. 10 (b) shows a data change location.

As described above, when one pixel changes from the discharge pixel "1" to the non-discharge pixel "0" as described above, the non-discharge pixel "0" in the vicinity changes to the discharge pixel " The step of supplementing the discharge pixel " 1 " on the back side can be coped with by rewriting the position of the discharge pixel " 1 " in the compressed data.

Here, an example in which the discharge pixel " 1 " in the first row and the second column in Fig. 3A is moved to the 0th row and the first column in Fig. 3B will be described. In Fig. 10A, the discharge pixel " 1 " in the first row and the second column in Fig. 3 (a) has the position information " 18 "

Therefore, in Fig. 10 (a), the position information "18" of the fifth data is rewritten to "1" which is position information of the 0th row and the 1st column of Fig. 3 (b) The discharge pixel " 1 " in the tenth shifts to the 0th row and the first column in Fig. 3 (b). In Fig. 10 (b), the nozzle complementing process is performed by performing the same process on the 13th, 23rd, 29th, 37th and 47th data. As described above, Put Bits compression, which is an image compression method according to the first embodiment, does not change the number of compressed data even if nozzle compensation is performed.

Next, with reference to Figs. 10 (c) and 3 (c), a description will be given of the result of correcting the position displacement correction of Put Bits compressed image which is the image compression method of the first embodiment. In Fig. 3 (c), since the positional displacement correction is performed, the data in the 0th row, the 1st row, the 5th row, and the 6th row in Figs. 3 (a) and 3 (c) change.

In the 0th and 1st rows of Fig. 3 (a), the discharge pixel " 1 " is shifted from the 1st row to the 2nd row to the 0th row and the 2nd column, from the 1st row to the 8th column to the 0th row to the 8th column, 15th column to the 0th row and the 15th column. In the fifth and sixth rows, the ejection pixel " 1 " moves from the sixth row to the second column to the fifth row and the second column, from the sixth row to the eighth column to the fifth row and the eighth column, and from the sixth row to the 15th column to the fifth column and the 15th column. In the positional shift correction as described above, when one pixel changes from the discharge pixel "1" to the non-discharge pixel "0", the non-discharge pixel "0" in the same column changes to the discharge pixel "1".

This operation can be directly performed on the compressed data in Put Bits compression which is the image compression method of the first embodiment. Fig. 10 (c) shows the result of the positional shift correction performed in Fig. 3 (c) for the compressed data in Fig. 10 (a). The triangular display on the subscript of each data in Fig. 10 (c) indicates a data change location. As described above, in the positional shift correction, when one pixel changes from the discharge pixel "1" to the non-discharge pixel "0", the non-discharge pixel "0" of the same column changes to the discharge pixel " , The step of correcting the displacement of the discharge pixel " 1 " can be handled by rewriting the position of the discharge pixel " 1 " in the compressed data.

Here, an example in which the discharge pixel " 1 " in the first row and the second column in Fig. 3A is moved to the 0th row and the second column in Fig. 3B will be described. In Fig. 10A, the discharge pixel " 1 " in the first row and the second column in Fig. 3 (a) has the position information " 18 " Therefore, in FIG. 10 (a), the position information "18" of the fifth data is rewritten to "2" which is position information of the 0th row and the 2 nd column of FIG. 3 (b) The discharge pixel " 1 " in the tenth shifts to the 0th row and the second column in Fig. 3 (b). In Fig. 10 (b), the positional deviation correction step is performed by performing the same process on the 13th, 23rd, 29th, 37th and 47th data.

As described above, Put Bits compression, which is the image compression method of the first embodiment, does not change the number of compressed data even if the positional shift correction is performed.

(Embodiment 2)

Embodiment 2 is a case where ejection images are compressed on a row-by-row basis by using the compression method of the first embodiment. Items which are not described are the same as those of the first embodiment.

Next, a description will be given with reference to Figs. 11 (a) to 11 (c).

Figs. 11 (a) to 11 (c) are data obtained by compressing Put Bits compression, which is the image compression method of the second embodiment, in Figs. 3A to 3C, 11 (b) shows the print data after the nozzle complementation, and Fig. 11 (c) shows the print data after the positional shift correction. Fig. 11 Data. 11 (a) to 11 (c) are described as a one-dimensional array, and the suffixes on the data indicate the array numbers.

Here, it is assumed that the compression process is performed sequentially from the upper left side to the lateral direction of the image.

11 (a), a compression process using Put Bits compression, which is an image compression method according to the first embodiment, will be briefly described. Fig. 11 (a) is a result of compressing Fig. 3 (a), and therefore will be described with reference to Fig. 3 (a). Here, the compression section length in Put Bits compression, which is the image compression method of Embodiment 1, is set to 16, which is the data length of one row in Fig. 3 (a). When the data of the discharge pixel " 1 " moves beyond the compression section, it is necessary to have rewritable data in the discharge pixel " 1 " in the compression section of the destination. Therefore, Even if the number of data is zero, a certain number of dummy ejection data are arranged so that the ejection data can be rewritten.

The dummy ejection data is free when the position information is not overlapped with other ejection data, but the value is always non-ejection data " 0 ". Here, the case of embedding three dummy ejection data for each ejection section will be described as an example. The number of dummy ejection data is determined in advance at the time of data compression according to the change of the ejection position of the inkjet head to be used and the occurrence frequency of clogging. This time, three dummy discharge data are described.

Fig. 3 (a) is as shown in Fig. 11 (a) when the three dummy ejection data are compressed for each row in a state of embedding the three dummy ejection data as described above. Here, the embedding of the dummy ejection data will be described by taking the 0 < th > line of Fig. 3 (a) as an example. 3 (a), since the entire data is non-ejection data, if it is normal, only the number of uncompressed data, which is the number of uncompressed data, is "0". In this case, three dummy ejection data are embedded. The number of data is " 3 ", and " 3 " is recorded in the zeroth data of Fig. 11A. In addition, since each dummy ejection data has a value of 0, the first to sixth data in Fig. 11 (a) are all recorded as zero.

Next, in the first row of Fig. 3A, four data from the 0th column to the 3 rd column, four columns from the 6th column to the 9th column, and four columns from the 12th column to the 15th column, quot; 12 " is recorded in the seventh data in Fig. 11A, and the relative positions and values of the ejection data are recorded in the 8th to 31st positions in Fig. 11A.

Here, the discharge pixel " 1 " in the first row and the 0th column in Fig. 3A will be described as an example. Since the data of the first row and the 0th column of Fig. 3A become 0th data counted from the first row 0th column to the right, the data position " 0 " is recorded in the eighth data of Fig. 11A , And the data value " 1 " is recorded in the second data. This process is performed on the second to seventh rows of the remainder of Fig. 3 (a), resulting in the result of Fig. 11 (a), and 128 data are compressed into 91 data.

Next, with reference to Figs. 11 (b) and 3 (b), a description will be given of the results of the case where a compressed image per row is compressed by using Put Bits compression, which is an image compression method of the first embodiment. In Fig. 3 (b), since the nozzles are supplemented, the data of the 0th line, the 1st line, the 5th line, and the 6th line change in Figs. 3 (a) and 3 (b). In the 0th and 1st rows of Fig. 3A, the ejection pixel " 1 " is shifted from the 1st row to the 2nd row to the 0th row and the 1st column, from the 1st row to the 8th column to the 0th row and the 7th column, And moves from the 15th to the 0th row and the 14th column.

In the fifth and sixth rows, the ejection pixels " 1 " move from the sixth row to the second column to the fifth row and the first column, from the sixth row to the eighth column to the fifth row and seventh column and from the sixth row to the 15th column to the fifth column and the fourteenth column. As described above, when one pixel changes from the ejection pixel "1" to the non-ejection pixel "0", the non-ejection pixel "0" in the vicinity changes to the ejection pixel "1". This operation can be directly performed on the compressed data in Put Bits compression which is the image compression method of the first embodiment.

Fig. 11 (b) shows the result of nozzle compensation performed in Fig. 3 (b) for the compressed data of Fig. 11 (a). The triangular representation on the subscript of each data in Fig. 11 (b) shows a data change location. As described above, when one pixel changes from the ejection pixel "1" to the non-ejection pixel "0", the non-ejection pixel "0" in the vicinity changes to the ejection pixel " , The value of the target discharge pixel "1" is rewritten to the non-discharge pixel "0", the position of the dummy discharge pixel in the compression section of the nozzle complementary destination is set to the position of the pixel of the nozzle complementary destination, Quot; 1 " to the discharge pixel " 1 ".

Here, an example in which the discharge pixel " 1 " in the first row and the second column in Fig. 3A is moved to the 0th row and the first column in Fig. 3B will be described. In Fig. 11A, the discharge pixel " 1 " in the first row and the second column in Fig. 3 (a) has the position information " 2 "

Therefore, in Fig. 11A, the discharge pixel "1" of the first row and the second column is changed to the non-discharge pixel "0" by rewriting the value of the thirteenth data "1" to "0".

Next, the data of the 0th row and the 1st column of Fig. 3 (b) are written in the dummy ejection data of the compression section of the 0th row, so that the first data of Fig. 11 (b) 1 ", which is the value of the first column of the first row and the value of the 0th row and the first column of Fig. 3 (b), in the second data of Fig. 11 (b) 1 ".

In the above-described procedure, the discharge pixel " 1 " in the first row and the second column in Fig. 3A is moved to the 0th row and the first column in Fig. 3B. 11 (b), steps 21, 31, 66, 74 and 84 for rewriting the value of the ejection pixel "1" to the non-ejection pixel "0" are repeated for the positions and values of the ejection pixels The nozzles complementing process is carried out by performing the steps of rewriting to "1" for 2, 3, 4, 5, 6, 54, 55, 56, 57, 58,

As described above, Put Bits compression, which is an image compression method according to the first embodiment, does not change the number of compressed data even if nozzle compensation is performed.

Next, with reference to FIG. 11 (c) and FIG. 3 (c), a description will be given of the result of correcting the image subjected to the positional shift by Put Bits compressed image which is the image compression method of the first embodiment. In Fig. 3 (c), since the positional displacement correction is performed, the data in the 0th row, the 1st row, the 5th row, and the 6th row in Figs. 3 (a) and 3 (c) change.

In the 0th and 1st rows of Fig. 3 (a), the discharge pixel " 1 " is shifted from the 1st row to the 2nd row to the 0th row and the 2nd column, from the 1st row to the 8th column to the 0th row to the 8th column, 15th column to the 0th row and the 15th column. In the fifth and sixth rows, the ejection pixel " 1 " moves from the sixth row to the second column to the fifth row and the second column, from the sixth row to the eighth column to the fifth row and the eighth column, and from the sixth row to the 15th column to the fifth column and the 15th column. In the positional shift correction as described above, when one pixel changes from the discharge pixel "1" to the non-discharge pixel, the non-discharge pixel in the same column changes to the discharge pixel "1".

This operation can be directly performed on the compressed data in Put Bits compression which is the image compression method of the first embodiment. Fig. 11 (c) shows the result of performing the positional shift correction performed in Fig. 3 (c) for the compressed data in Fig. 11 (a). The triangular display on the subscript of each data in Fig. 10 (c) indicates a data change location.

As described above, when one pixel changes from the discharge pixel "1" to the non-discharge pixel as described above, since the non-discharge pixel in the same column changes to the discharge pixel "1", the discharge pixel "1" In the process, the value of the target discharge pixel " 1 " is rewritten to the non-discharge pixel, the position of the dummy discharge pixel in the compression section of the positional displacement correction target is set to the position of the pixel of the position- 1 ".

Here, an example in which the discharge pixel " 1 " in the first row and the second column in Fig. 3A is moved to the 0th row and the second column in Fig. 3C will be described. In Fig. 11A, the discharge pixel " 1 " in the first row and the second column in Fig. 3 (a) has the position information " 2 "

 Therefore, in Fig. 11A, the discharge pixel " 1 " in the first row and the second column is changed to the non-discharge pixel by rewriting the thirteenth data value " 1 " Next, the data of the 0th row and the 2nd column of Fig. 3 (b) are written in the dummy ejection data of the compression section of the 0th row, so that the first data of Fig. 11 (c) The non-ejecting pixel is changed to the ejecting pixel " 1 " by writing "2" as the position information of the tenth column and "1" as the value of the 0th row and the second column of Fig. 3 do.

In the above procedure, the discharge pixel " 1 " in the first row and the second column in Fig. 3 (a) is moved to the 0th row and the second column in Fig. 3 (c). 11 (c), steps 21, 31, 66, 74 and 84 are repeated for rewriting the value of the ejection pixel "1" to the non-ejection pixel, and the position and value of the dummy ejection pixel are set to the ejection pixel " The positional deviation correction step is performed by performing steps 2, 3, 4, 5, 6, 54, 55, 56, 57, 58, As described above, Put Bits compression, which is the image compression method of the first embodiment, does not change the number of compressed data even if the positional shift correction is performed.

In the first embodiment, all data is compressed as one lump. For this reason, when the amount of data becomes large, a case that is difficult to compress according to the expressible range of " data type of data position " occurs.

In the second embodiment, the data is not compressed in one lump, but the data is divided into a plurality of sections and compressed, and the section for one compression is set in a range in which the data type of the data position can be expressed. Thereby, even when the amount of data becomes large, it can be dealt with more.

However, rewriting was performed by embedding 0 data in advance in order to cope with the occurrence of data movement between compressed sections.

(Embodiment 3)

A method of printing when compressed by the compression method of the first and second embodiments will be described as a third embodiment. Items not described are the same as those of the first and second embodiments.

As described above, in Put Bits compression, which is an image compression method according to the first and second embodiments, the data length does not change even if nozzle compensation or positional shift correction is performed. Therefore, even when the nozzle complement or the positional shift correction is performed, the entire data can be dealt with only by the modification of the changed portion without re-compressing the entire data again.

Figs. 12 (a) and 12 (b) show the operation of an inkjet printer using Put Bits compression, which is an image compression method according to the first and second embodiments. Fig. 12 (a) shows the operational flow at the time of first printing, and Fig. 12 (b) shows the operation at the time of non-discharge compensation and positional displacement correction change.

First, Fig. 12 (a) will be described. 12 (a), except that compression method 507, decompression step, and printing method 508 use Put Bits compression, which is an image compression method of the first embodiment, Process. That is, it is necessary to compress and transmit the entire data even in Put Bits compression, which is the image compression method of the first embodiment at the time of first printing.

Specifically, this will be described with reference to Fig. 5 (a).

In the print data reading step 501, a print pattern created based on the design information of the bank 101a, which is the pixel of the substrate 101 that is the panel to be printed, is read.

In the fire ejection nozzle supplementing step 502, the clogged nozzle is supplemented with the neighboring nozzle. This compensates for the amount of ink supplied to the bank 101a, which is the pixel of the substrate 101 to be printed.

In the positional deviation correcting step 503, the positional deviation is canceled by changing the ejection timing of the ink when the position of the droplet ejected from each nozzle deviates in the longitudinal direction.

In the compression step 504, compression is performed using the compression method of the first or second embodiment.

In the transfer step 505, the compressed data is transferred from the print data generation unit 103 of Fig. 1 to the inkjet head control unit 104. [

In the defrosting process and the printing process 506, the compressed data stored in the print data holding memory 104b is sequentially defrosted in accordance with the movement of the substrate 101, which is the print target of FIG.

In this first round flow, the data amount is smaller than that of the conventional one, and the processing can be performed in a short time.

Next, the following description will be made during the first printing. 12 (b) will be described. In Put Bits compression, which is an image compression method according to Embodiments 1 and 2, even when nozzle correction or positional displacement correction is performed, only the changed portion can be corrected without re-compressing the entire data again. Therefore, it is not necessary to perform the compression step 504 and the transmission step 505 as shown in Fig. 5 (b) when the non-discharge ejection compensation or the positional shift correction is changed after the first printing, The rewriting step 509 may be performed.

This compressed data rewriting process bypasses only the changed portion of the print data generated in 103a of FIG. 1 and passes through the print data retaining memory 104b ) Of the compressed print data.

Therefore, when Put Bits compression, which is an image compression method according to the first and second embodiments, is used as shown in Fig. 12 (b), it is not necessary to compress the entire data and to transfer the data again It is possible to perform nozzle compensation and positional displacement correction in a shorter time than in the case of using the Pack Bits method or the like which is one of the compression methods.

That is, in the case where a newly clogged nozzle occurs, or when a new liquid droplet landing position shift occurs, the non-injection nozzle complementing step 502 or the positional deviation correcting step 503 is not performed, In the compressed data rewriting step 509 for rewriting the compressed data.

As described above, according to the image compression method of the present embodiment, it is possible to perform nozzle compensation and positional shift correction in a shorter time than the conventional method.

(Fourth Embodiment)

Embodiment 4 describes an image compression method in the case where each pixel of the ejected image includes additional information in addition to information indicating ejection or non-ejection. The additional information may be ejection volume information, ejection timing correction information, or the like, but is not limited thereto. Items which are not described are the same as those of the first embodiment. If additional information is included as data, better printing is possible. Items not described are the same as in Embodiments 1 to 3.

Next, the additional information will be described. The ejection or non-ejection information may be included in the same information as the ejection volume information of the additional information. The ejection volume information is information for changing the amount of droplets ejected from each nozzle at each ejection timing.

The ejection timing correction information is information for changing the amount of ejection of the droplet from the nozzle by a minute amount. The small amount means one cycle or less of the droplet ejection. Or less, preferably less than half a period. One cycle is a period in which droplets are successively applied between the banks. More preferably, it is preferably one quarter cycle or less. One-eighth cycle or less is more preferable. So that it is not mistakenly applied to adjacent banks.

Thus, in the image compression method according to the fourth embodiment, the data length is compressed by treating only the non-ejection pixel "0" having the highest probability of existence as already known information, and recording only the additional data "other than 0".

It has been considered to compress the data length by dividing the print data into a predetermined length called a compression section length, and recording the number and position and value of the ejection data "other than 0" in the divided data. In addition, the compression section length is determined in advance before compression according to the amount of memory capable of securing the compressor and the thawing machine, and a common value is used for compression and thawing.

Here, the compression section length is a length when the data is divided and processed for each predetermined section. However, the compression section length is preferably determined according to the amount of information that can be processed by the controller. Therefore, when the amount of information that can be processed by the controller is larger than the total amount of information, the entire processing may be performed once.

In this compression method, at the time of defrosting, after securing the data area of the compression section length, it is initialized to non-ejection data "0", and based on each additional data and value in the compressed data, By overwriting additional data in the area, data before compression is restored.

<Data Structure of Fourth Embodiment>

13 shows the data structure of the image compression method according to the third embodiment. First, there are the number of ejection pixels and the number of droplet ejection data 1301 in the predetermined compression section (A). Next, there are the number of ejection pixels and the number of droplet ejection data 1302 in the predetermined section (B).

There is a relative position 1303 based on the head of each section of the first discharge pixel in the compression section A as a reference. The value of the first discharge pixel in the compression section A, and the additional information 1304.

There is a relative position 1305 based on the head of each section of the second discharge pixel in the compression section (A). And the value of the second discharge pixel in the compression section (A), additional information 1306. There is a relative position 1307 based on the head of each section of the n-th discharge pixel in the compression section A. [ The value of the n-th discharge pixel in the compression section A, and additional information 1308. [ In this case, the number of droplet ejection data 1301 is n.

There is a relative position 1309 based on the head of each section of the first discharge pixel in the section B. [ And the value of the first discharge pixel in the section B, additional information 1310. [ And a relative position 1311 based on the head of each section of the m-th discharge pixel in the section B. [ The value of the m-th discharge pixel in the section B, and the additional information 1312. In this case, the number of droplet discharge data 1302 is m.

Here, the order of describing each discharge pixel may not necessarily be an ascending order or a descending order. In this embodiment, data of two sections is described as a sum, but it may be one section or three sections or more.

<Effect>

In the above-described embodiment, even when there is not a small amount of continuous data, compression can be performed at a high compression ratio. Therefore, the data transfer time is shortened and the operation rate of the apparatus is less affected.

Further, not only the positional information but also additional information such as ejection timing correction information and ejection volume information can be compressed as the data at a high compression ratio.

<Overall>

Although the embodiment has been described using an inkjet apparatus, it can be widely applied to an apparatus for applying a droplet from a nozzle.

 Embodiments 1 to 4 can be combined.

Since the image compression method and the image compression system of the present invention enable data to be rewritten in a compressed state with a simple logic, for example, it is possible to change the print data in accordance with the change of the nozzle status of the ink- .

Therefore, it is useful for use in, for example, a droplet discharge type printing apparatus for applying and forming an organic light emitting material in the production of an organic EL display panel.

101: substrate 101a: bank
102: inkjet head 102a: nozzle
103: Print data generation unit 103a: Print data generation unit
103b: print data compressor 103c: print data transmitter
104: inkjet head control unit 104a: print data receiver
104b: print data holding memory 104c: position detector
104d: print timing generator 104e: drive signal generator
104f: print data decomposer 501: print data read process
502: Non-discharge nozzle complementing step 503: Correction step
504 compression process 505 transfer process
506: printing process 507: compression process
508: Printing process 509: Compressed data rewriting process
701: Number of droplet discharge data 702: Relative position
703: droplet discharge amount 704: relative position
705: droplet discharge amount 706: relative position
707: droplet discharge amount 802: relative position
803: droplet discharge amount 804: droplet discharge amount
805: relative position 806: droplet discharge amount
807: droplet discharge amount 808: relative position
809: droplet discharge amount 810: droplet discharge amount
1301: Number of droplet ejection data 1302: Number of droplet ejection data
1303: relative position 1304: additional information
1305: relative position 1306: additional information
1307: relative position 1308: additional information
1309: relative position 1310: additional information
1311: relative position 1312: additional information

Claims (9)

The number of the plurality of droplet discharge data,
The position of each of the plurality of droplet ejection data,
And a droplet discharge amount at each of the positions. The method according to claim 1,
The number of droplet discharge data of the dummy,
The position of the droplet discharge data of the dummy,
And zero as a discharge amount at a position of the droplet discharge data of the dummy. The number of the plurality of droplet discharge data,
The position of each of the plurality of droplet ejection data,
And additional information at each of the locations. The method of claim 3,
Wherein the additional information is at least one of ejection volume information and droplet ejection timing correction information. A compressed data structure comprising a plurality of compressed data structures as claimed in claim 1. The method according to claim 1,
Wherein the position is a position on a map of a liquid drop discharge timing and a position of a nozzle for discharging the liquid drop. A division step of dividing print data, which is a map of the ejection timing of the droplet and the nozzle position at which the droplet is ejected,
And a compression step of compressing the print data of the predetermined section into the compressed data structure of claim 1. A print data reading step of reading a print pattern, which is information of a bank of a panel to be printed,
A non-discharge nozzle supplementing step of supplementing the clogged nozzle with another nozzle,
A position deviation correcting step of changing the ejection timing of the liquid droplet when a landing position deviation of the liquid droplet ejected from the nozzle occurs,
A compressing step of compressing the print data using the compressed data structure described in claim 1 by creating print data from the print data reading step, the non-discharge nozzle supplementing step and the positional shift correcting step,
A transfer step of transferring the compressed data to an inkjet head,
A decompressing step of decompressing the transferred compressed data into the print data,
And performing printing on the panel with the thawed print data. The method of claim 8,
Further, in the case where a newly clogged nozzle occurs or a new droplet landing position shift occurs, without performing the above-described non-discharge nozzle complementing step or the positional displacement correcting step, the compressed data to be rewritten is rewritten And a data rewriting process is performed.

Images