Patent Publication Number: US-2007109606-A1

Title: Method of correcting ejection pattern data, apparatus for correcting ejection pattern data, liquid droplet ejection apparatus, method of manufacturing electro-optic device, electro-optic device, and electronic device

Description:
The entire disclosure of Japanese Patent Application No. 2005-332180, filed Nov. 16, 2005, is expressly incorporated by reference herein.  
     BACKGROUND  
      1. Technical Field  
      The present invention relates to a method of correcting ejection pattern data in which ejection pattern data is corrected for performing drawing (or imaging) processing on a workpiece to selectively eject function liquid droplets from a plurality of nozzles of a function liquid droplet ejection head represented by an ink jet head. It also relates to an ejection pattern data correction apparatus, a liquid droplet ejection apparatus, a method of manufacturing an electro-optic device, an electro-optic device, and an electronic device.  
      2. Related Art  
      Conventionally, there is known a liquid droplet ejection apparatus for performing drawing processing in which an ink (a function liquid) is ejected from an ink ejection nozzle (nozzle) of an ink jet head (a function liquid droplet ejection head) toward a color filter (a workpiece) having arrayed therein plural rows of colored portions, the ejection being made based on ejection pattern data. Since the amount of ink to be ejected (ink ejection amount) is not uniform among the plurality of the ink ejection nozzles, the following correction is considered. Namely, in order to unify the ink ejection amount among the plural rows of colored portions, the color density is detected at each row of the colored portions. Based on the color density, the density of the ink to be ejected toward each row of the colored portions is corrected. JP-A-10-315510 is an example of related art.  
      In this kind of method of correcting the ejection pattern data, however, the ink ejection density among the plural rows of the colored portions is different from one another. Therefore, even if the ink ejection amount is unified among the plural rows of the colored portions, such unifying will be a positive cause for unevenness in drawing (or non-uniform drawing). In other words, the colored portions having different ink ejection density from one another will be arrayed in a row. As a result, when the color filter is viewed as a whole, the colored portions of that particular row will be recognized as an uneven row of the colored portion.  
     SUMMARY  
      It is an advantage of the invention to provide a method of correcting ejection pattern data in which ejection pattern data can be corrected in such a manner that the viewer hardly realizes (notice) the drawing unevenness of a workpiece as a whole, as well as an apparatus for correcting ejection pattern data, a liquid droplet ejection apparatus, a method of manufacturing an electro-optic device, an electro-optic device, and an electronic device.  
      According to one aspect of the invention, there is provided a method of correcting ejection pattern data to eliminate drawing unevenness in drawing processing in which a function liquid droplet ejection head is moved relative to a workpiece to selectively eject function liquid droplets from a plurality of nozzles of the function liquid droplet ejection head according to ejection pattern data. The method comprises the steps of: calculating an amount of function liquid given in the drawing processing to each of a plurality of imaginary divided portions obtained by partitioning into matrix a drawing region on the workpiece; generating matrix data which represents in multi-valued gradation an amount of function liquid given to the plurality of imaginary divided portions; processing gradation by converting the matrix data into n-valued data to thereby generate n-valued matrix data, where n is an integer equal to or larger than 2; and correcting ejection pattern data so as to perform at least one of decreasing and increasing the amount of function liquid given to the imaginary divided portions. The amount is decreased where each of the n-valued data of the n-valued matrix data represents the side of “large,” and the amount is increased where each of the n-valued data of the n-valued matrix data represents the side of “small,” respectively, in the amount of function liquid given to the imaginary divided portions.  
      According to another aspect of the invention, there is provided an apparatus for correcting ejection pattern data to eliminate drawing unevenness in drawing processing in which a function liquid droplet ejection head is moved relative to a workpiece to selectively eject function liquid droplets from a plurality of nozzles of the function liquid droplet ejection head according to ejection pattern data. The apparatus comprises: a storing device for storing the ejection pattern data; a calculating device for calculating an amount of function liquid given in the drawing processing to each of a plurality of imaginary divided portions obtained by partitioning in matrix a drawing region on the workpiece; a data generating device for generating matrix data which represents in multi-valued gradation an amount of function liquid given to the plurality of imaginary divided portions; a gradation processing device to convert the matrix data into n-valued data to thereby generate n-valued matrix data, where n is an integer equal to or larger than 2; and a data correction device for correcting the ejection pattern data so as to perform at least one of decreasing and increasing the amount of function liquid given to the imaginary divided portions. The amount is decreased where each of the n-valued data of the n-valued matrix data represents the side of “large,” and the amount is increased where each of the n-valued data of the n-valued matrix data represents the side of “small,” respectively, in the amount of function liquid given to the imaginary divided portions.  
      According to these configurations, conversion into n-valued data is made of the matrix data based on the amount of function liquid given (or added) to each of the imaginary divided portions. As a result, the corrected ejection pattern data will adequately increase and/or decrease the amount of giving the function liquid to each of the imaginary divided portions. For example, suppose that matrix data is prepared by representing the amount of giving the function liquid in 10 stages from “0”, (function liquid giving amount: large) to “9” (function liquid giving amount: small) and that binarizing processing (i.e., conversion into 2-valued data) is performed. Then, in a region in which the function liquid giving amount is large, the 2-valued (binary) data in the imaginary divided portions partly becomes “0.” The amount of giving the function liquid for such imaginary divided portions is thereby decreased. The amount of giving the function liquid is thus decreased over the entire region in which the amount of giving the function liquid is large. The unevenness in drawing is eliminated, in this manner, in the workpiece as a whole. As a result, it is possible to correct the ejection pattern in such a manner that the viewer hardly realizes the unevenness in the workpiece as a whole.  
      In the above example, although a description was made about the binarizing processing, it is not necessary to limit the gradation processing to binarizing. Further, it is preferable that the number of gradation of the n-valued matrix data be set based on the adjustable number of the function liquid ejection amount per one shot. For example, in case the amount of function liquid ejection per one shot can be classed into large, medium, and small in shooting, the function liquid ejection amount may be 3-valued or further, by giving the case of no ejection, 4-valued.  
      It is preferable that, at the step of processing gradation, the n-valued matrix data be generated by conversion into n-valued data using one of a threshold value method, a systematic dither method, and an error diffusion (dispersion) method.  
      According to this configuration, it is possible to adequately carry out the conversion of the matrix data into n-valued data by means of a general and easy data processing. The error diffusion method is more preferable since, according to it, the more the region becomes rough, the more the apparent gradation can be improved. Unevenness in image can be made to be less recognizable.  
      It is preferable that the method further comprise the step of measuring, prior to the step of calculating an amount of function liquid, an ejection amount of the function liquid per unit shot to be ejected from a nozzle group made up of one or more of the nozzles corresponding to the imaginary divided portions. At the step of calculating an amount of function liquid, the function liquid giving amount is calculated based on a result of measuring the function liquid ejection amount and the ejection pattern data.  
      According to this configuration, the function liquid ejection amount can be measured by causing the function liquid to be ejected for inspection purpose out of the function liquid ejection head. As a result, the matrix data can be generated without performing drawing processing. Therefore, the drawing processing can be adequately performed from the first round of the workpiece.  
      It is preferable that the amount of function liquid ejection be measured by measuring the weight of the function liquid droplet, measuring the flight speed of the function liquid droplet, measuring the size of the function liquid droplet in flight, measuring the diameter of the function liquid droplet that has reached the target, and the like.  
      It is preferable that the method further comprise the step of measuring, prior to the step of calculating an amount of function liquid, an optical density, at each of the imaginary divided portions, of the film forming part formed on the workpiece by the function liquid in the drawing processing. At the calculating step, the function liquid giving amount is calculated based on a result of measuring the optical density.  
      According to this configuration, the amount of giving the function liquid is calculated based on the result of measuring the optical density of the film forming part formed on the workpiece. Therefore, the matrix data can be adequately generated based on the actual drawing result.  
      The optical density of the film forming part shall preferably be measured by means of transmittance measurement, absorbance measurement, reflectance measurement, and the like.  
      It is preferable that the method further comprise the step of measuring, prior to the step of calculating an amount of function liquid, a film thickness, at each of the imaginary divided portions, of the film forming part formed on the workpiece by the function liquid in the drawing processing. At the step of calculating an amount of function liquid, the function liquid giving amount is calculated based on a result of measuring the film thickness.  
      According to this configuration, the amount of giving the function liquid is calculated based on the result of measurement of the film thickness at the film forming part formed on the workpiece. Therefore, the matrix data can be adequately generated based on the result of actual drawing.  
      As the measurement of the film thickness at the film forming part, an optical interference method, a stylus method, and the like may be used.  
      It is preferable that the step of correcting data correct the ejection pattern data by at least one of increasing and decreasing the number of shots from each of the nozzles and the quantity of the function liquid ejection amount per one shot so as to increase or decrease the function liquid giving amount.  
      According to this configuration, by a simple control in which the number of shots from each of the nozzles is increased or decreased or in which the amount of function liquid ejection per one shot is increased or decreased, the amount of function liquid given to each of the imaginary divided portions can be increased or decreased.  
      It is preferable that the liquid droplet ejection apparatus comprise: a liquid droplet ejection head; a moving device for moving the function liquid droplet ejection head relative to a workpiece; and a head control device for controlling each of the nozzles of the function liquid droplet ejection head based on the ejection pattern data as corrected by the above-described method of correcting ejection pattern data.  
      According to this configuration, the drawing processing is performed by the corrected ejection pattern data in such a manner that the viewer hardly realizes the unevenness in drawing over the entire workpiece.  
      A method of manufacturing an electro-optic device comprises forming on a workpiece a film forming part by a function liquid droplet by using the above-described liquid droplet ejection apparatus.  
      An electro-optic device comprises a film forming part formed on the workpiece by the function liquid by using the above-described liquid droplet ejection apparatus.  
      According to these configurations, there is used the liquid droplet ejection apparatus which can perform drawing processing in which the viewer can hardly realize the unevenness in the workpiece as a whole. It is therefore possible to manufacture a high-quality electro-optic device. As the electro-optic device (flat panel display: FPD), there can be listed a color filter, a liquid crystal display device, an organic EL device, a PDP device, an electron emission device, and the like. The electron emission device is a concept which includes the so-called field emission display (FED) device, and a surface-conduction electron-emitter display (SED) device. Further, as the electro-optic device, there is considered a device which includes the one for forming a metallic wiring, for forming a lens, for forming a resist, for forming an optical dispersion body, and the like.  
      An electronic device according to the invention has mounted thereon the electro-optic device manufactured by the above-described method of manufacturing an electro-optic device, or the above-described electro-optic device.  
      As the electronic device, there can be listed a mobile telephone having mounted thereon a so-called flat panel display, a personal computer, and various kinds of electric appliances. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
      The invention will be described with reference to the accompanying drawings, wherein like numbers reference like elements.  
       FIG. 1  is a schematic plan view of a liquid droplet ejection apparatus according to one embodiment of the invention.  
       FIG. 2  is an external perspective view of a function liquid droplet ejection head mounted on the liquid droplet ejection apparatus.  
       FIG. 3  is a block diagram showing a control system of the liquid droplet ejection apparatus.  
       FIG. 4  is a flow chart showing the correction processing of ejection pattern correction data.  
       FIG. 5  is a schematic diagram showing a result of drawing by ejection pattern data before correction.  
       FIG. 6  is a diagram showing an example of multi-valued matrix data.  
       FIG. 7  is a diagram showing an example of 2-valued matrix data.  
       FIG. 8  is a schematic diagram showing the result of drawing by ejection pattern data after correction.  
       FIG. 9  is a flow chart showing the steps of manufacturing a color filter.  
       FIGS. 10A  to  10 E are schematic sectional views of the color filter as shown in the order of manufacturing steps.  
       FIG. 11  is a sectional view of an important portion showing a general arrangement of a liquid crystal device using the color filter to which the invention is applied.  
       FIG. 12  is a sectional view of an important portion showing a general arrangement of a liquid crystal device of a second example using the color filter to which this invention is applied.  
       FIG. 13  is a sectional view of an important portion showing a general arrangement of a liquid crystal device of a third example using the color filter to which this invention is applied.  
       FIG. 14  is a sectional view of an important portion of the display device which is an organic EL device.  
       FIG. 15  is a flow chart showing the steps of manufacturing the display device which is an organic EL device.  
       FIG. 16  is a process drawing showing the formation of an inorganic-matter bank layer.  
       FIG. 17  is a process drawing showing the formation of an organic-matter bank layer.  
       FIG. 18  is a process drawing showing the steps of manufacturing a hole injection/transport layer.  
       FIG. 19  is a process drawing showing the state in which the hole injection/transport layer has been formed.  
       FIG. 20  is a process drawing showing the steps of manufacturing the blue light emitting layer.  
       FIG. 21  is a process drawing showing the state in which the blue light emitting layer has been formed.  
       FIG. 22  is a process drawing showing the state in which the light emitting layer of each color has been formed.  
       FIG. 23  is a process drawing showing the steps of manufacturing the cathode electrode.  
       FIG. 24  is an exploded perspective view showing an important portion of the display device which is a plasma display device (PDP device).  
       FIG. 25  is a sectional view of an important portion of the display device which is an electron emission device (FED device).  
       FIGS. 26A and 26B  are, respectively, a plan view around the electron emission device of the display device and a plan view showing the method of manufacturing the same. 
    
    
     DESCRIPTION OF EXEMPLARY EMBODIMENTS  
      With reference to the accompanying drawings, a description will now be made about an embodiment of a liquid droplet ejection apparatus which performs drawing processing (or imaging or painting processing) based on ejection pattern data as corrected by an ejection pattern data correction method according to the invention. The liquid droplet ejection apparatus is built-in in a manufacturing line of a flat panel display, and forms light-emitting elements, and the like, which serve as a color filter for a liquid crystal display device and a light-emitting element for an organic EL device by a printing technology-(ink jet method) using a liquid droplet ejection head which serves as an ink jet head.  
      As shown in  FIG. 1 , the liquid droplet ejection apparatus  1  is made up of: an apparatus base  2 ; a drawing apparatus (imaging or painting apparatus)  3  having mounted thereon a function liquid droplet ejection head  17 ; and a maintenance apparatus  4  which is disposed on the apparatus  2  next to the drawing apparatus  3 . In this configuration, maintenance processing (maintaining and recovering the function of the function liquid ejection head  17 ) is performed by the maintenance apparatus  4  and the drawing operation to eject the function liquid on a substrate W is performed by the drawing apparatus  3 . The liquid droplet ejection apparatus  1  is further provided with: an operation panel  5  for inputting various data; a control block (controller  6 , see  FIG. 3 ) for performing overall control of various constituting members; and the like.  
      The drawing apparatus  3  is made up of: an X-Y moving mechanism  11  having an X-axis table  12  and a Y-axis table  13  which crosses the X-axis table  12  at right angles; a carriage  14  which is movably attached to the Y-axis table  13 ; and a head unit  15  which is vertically provided on the carriage  14 . The head unit  15  has mounted thereon the function liquid droplet ejection head  17 . The substrate W, on the other hand, is mounted on the X-axis table  12  in a state of being aligned by means of a pair of substrate recognition cameras  18  (see  FIG. 3 ) which face an end portion of the X-axis table  12 . Although a single piece of function liquid droplet ejection head  17  is mounted in this embodiment, the number thereof may be arbitrarily determined.  
      The X-axis table  12  is directly supported on the apparatus base  2  and is made up of: a motor-driven X-axis slider  21  which constitutes a driving system in the X-axis direction; a setting table  22  which has a suction table  23 , substrate θ-axis table  24 , and the like, and is movably mounted on the X-axis slider  21 ; and an X-axis linear scale  25  (see  FIG. 3 ) which detects the momentary moving position of the setting table  22 .  
      The Y-axis table  13  is supported by left and right supporting columns  27  which are vertically disposed on the apparatus base  2 , and is elongated so as to bridge over the X-axis table  12  and the maintenance apparatus  4 . The Y-axis table  13  is made up of: a motor-driven Y-axis slider  26  which has movably mounted thereon the carriage  14  so as to constitute a driving system in the Y-axis direction; and a Y-axis linear scale  28  (see  FIG. 3 ) which detects the momentary moving position of the carriage  14 .  
      The Y-axis table  13  is arranged to adequately move the head unit  15  mounted thereon between a drawing area  91  which is positioned right above the X-axis table  12  and a maintenance area  92  which is positioned right above the maintenance apparatus  4 . In other words, the Y-axis table  13  operates to face the head unit  15  in the drawing area  91  when drawing operation is made on the substrate W introduced on the X-axis table  12 , and operates to face the head unit  15  in the maintenance area  92  when maintenance processing is performed on the function liquid droplet ejection head  17 .  
      The carriage  14  is made up of: a head θ-axis table  31  which causes the vertically disposed head unit  15  to rotate in normal and opposite directions of rotation (θ-rotation) by a very minute amount in a horizontal plane; and a head Z-axis table  32  (see  FIG. 3 ) which causes the head unit  15  to move by a very minute amount in a Z-axis direction (vertical direction, i.e., a direction perpendicular to the drawing sheet of  FIG. 1  as viewed by the viewer).  
      As shown in  FIG. 2 , the function liquid droplet ejection head  17  is to eject the function liquid with an ink jet method, and is made up of: a function liquid introducing part  41  having a dual-type connection needle  42 ; a dual-type head substrate  43  which is connected to the side of the function liquid introducing part  41 ; and a head main body  44  which is connected to the lower side (upper side in  FIG. 2 ) of the function liquid introducing part  41  and has formed therein an in-head flow passage which is filled with the function liquid. The dual-type connection needles  42  are connected to a function liquid bag (not shown) through a liquid supply tube, thereby supplying the in-head flow passage of the function liquid ejection head  17  with the function liquid.  
      The head main body  44  is made up of: a pump part  51  which is constituted by a piezoelectric element, and the like; and a nozzle plate  52  which has a nozzle surface  53  having formed therein two rows of nozzle arrays  54  in parallel with each other.  
      Each of the nozzle arrays  54  is constituted by disposing a plurality of (e.g., 180) nozzles  55  at even intervals (e.g., 140 μm). Both the nozzle arrays  54  are disposed from each other by half a pitch (70 μm) in a direction in which the nozzles are arrayed. In other words, the nozzle pitch of the two nozzle arrays  54  is 70 μm.  
      The dual-type head substrate  43  is provided with a dual-type connector  56 , each connector  56  being connected by means of a flexible flat cable to a head driver  111  (see  FIG. 3 ) which is described hereinafter. A driving wave form is applied to each pump part  51  from the controller  6  through the head driver  111 , whereby the function liquid is ejected from each nozzle  55 .  
      The amount of ejection of the function liquid from each nozzle  55  can be adjusted to, e.g., three stages of large, medium and small by controlling the applied voltage value of the driving wave form. It is to be noted that the amount of ejection of the function liquid from each nozzle  55  is not uniform but varies or fluctuates from nozzle to nozzle even if the driving wave form of the same voltage value is applied, this fluctuation being caused by the construction of the in-head flow passage, and the like.  
      The maintenance apparatus  4  has in the maintenance area  92 : a suction unit  61 ; and a wiping unit  62  which lies next to the suction unit  61  on the side of the drawing area  91  in the Y-axis direction. The suction unit  61  performs suction processing in which the function liquid is sucked from the nozzles  55  of the function liquid droplet ejection head  17 . The wiping unit  62  performs wiping processing in which a nozzle surface  53  of the function liquid droplet ejection head  17  is wiped off with a wiping sheet  81 .  
      With reference to  FIG. 3 , a description will now be made about the control system of the entire liquid droplet ejection apparatus  1 . The control system of the liquid droplet ejection apparatus  1  is basically made up of: an input block  101  which has an operation panel  5 ; an image recognition block  102  which has the substrate recognition cameras  18  and image-wise recognizes the substrate W; a movement detection block  103  which has the X-axis linear scale  25  and the Y-axis linear scale  28  and detects the momentary positions of the setting table  22  and the carriage  14 ; a driving block  104  which has various drivers to drive the function liquid droplet ejection head  17 , the X-Y moving mechanism  11 , and the like; and a control block  105  (controller  6 ) which performs an overall control over the liquid droplet ejection apparatus  1  inclusive of the above blocks.  
      The driving block  104  is made up of: a head driver  111  which controls the driving of ejection of the function liquid droplet ejection head  17 ; and a motor driver  112  which controls the driving of each of the motors of the X-Y moving mechanism  11 . The head driver  111  generates and applies the predetermined driving wave form according to the instructions of the control block  105  (details will be described hereinafter) to thereby control the driving for ejection of the function liquid droplet ejection head  17 . The motor driver  112  has an X-axis motor driver  113 , a Y-axis motor driver  114 , a substrate θ-axis motor driver  115 , a head θ-axis motor driver  116 , and a head Z-axis motor driver  117 . These drivers control the driving of each of the driving motors for the X-axis table  12 , the Y-axis table  13 , the substrate θ-axis table  24 , the head θ-axis table  31 , and the head Z-axis table  32  according to the instructions of the control block  105 .  
      The control block  105  has a CPU  121 , a ROM  122 , a RAM  123 , and a P-CON  124 . They are connected to one another through a bus  125 . The ROM  122  has a control program region which stores therein a control program to be processed in the CPU  121 , and the like, and a control data region which stores therein control data for performing drawing processing and image recognition.  
      The RAM  123  has, aside from various register groups, a drawing data region which stores therein ejection pattern data for drawing processing, an image data region which temporarily stores therein image data, and a correction data region which stores therein correction data for correcting the position of the substrate W and the carriage  14 , and the like, and is used as various working regions for control processing.  
      The P-CON  124  has built therein a logic circuit which supplements the function of the CPU  121  and also handles the interface signals with the peripheral circuits. Therefore, the P-CON  124  captures image data and various commands from the input block  101  as they are or with due processing and, in cooperation with the CPU  121 , outputs to the driving block  104  the data and control signals which are outputted from the CPU  121 , and the like as they are or with due processing.  
      The CPU  121  inputs various detection signals, various commands, various data, and the like, through the P-CON  124  according to the control program in the ROM  122 , processes various data inside the RAM  123 , and then outputs the various control signals to the driving block  104 , and the like, through the P-CON  124 , thereby performing an overall control over the liquid droplet ejection apparatus  1 .  
      For example, the control block  105  controls the driving of the function liquid droplet ejection head  17  based on the ejection pattern data so that the function liquid droplets can be selectively ejected from each of the nozzles  55 . In other words, the ejection pattern data is sequentially retrieved to correspond to the position of the substrate W and the position of the head unit  15  as detected by the X-axis linear scale  25  and the Y-axis linear scale  28 . The retrieved ejection pattern data is converted into a driving signal (driving wave form) for the function liquid droplet ejection head  17  and is thereafter transmitted to the function liquid droplet ejection head  17 . Based on the driving signal, the pump part  51  of the function liquid droplet ejection head  17  is driven, whereby the function liquid droplets can be selectively ejected from each of the nozzles  55 .  
      The liquid droplet ejection apparatus  1  thus configured performs maintenance work of the function liquid droplet ejection head  17  by the maintenance apparatus  4  as required and also performs drawing operation on the substrate W by means of the drawing apparatus  3 . In other words, the drawing apparatus  3  moves, while undergoing the control by the controller  6 , the substrate W forward in the X-axis direction and, in a manner synchronized therewith, drives the function liquid droplet ejection head  17  to thereby perform main scanning on the substrate W. Then, after performing sub-scanning of the head unit  15  in the Y-axis direction by means of the Y-axis table  13 , the substrate W is moved back in the X-axis direction and, in a manner synchronized therewith, the function liquid droplet ejection head  17  is driven to perform main scanning once again. By repeating the main scanning accompanied by the forward moving of the substrate W and the sub-scanning by the head unit  15  plural times, the ejection (drawing) of the function liquid is performed from end to end of (the drawing region Wd of) the substrate W.  
      With reference to FIGS.  4  to  8 , a description will now be made about the correction processing of the ejection pattern data, the processing being performed in the liquid droplet ejection apparatus  1 .  FIG. 5  is a schematic diagram showing the result of drawing (or imaging) by the ejection pattern data before correction. In this drawing operation, the regions on upper and lower end portions in the drawing region Wd of the substrate W are drawn (or pictured) thicker or darker. As described hereinabove, the amounts of ejecting the function liquid droplets from the plurality of nozzles  55  are not even or uniform. Therefore, even if the function liquid droplets are ejected from each of the nozzles  55  according to the ejection pattern data before correction, there will actually occur unevenness in drawing (also called drawing unevenness) as shown in the figure. Correction of the ejection pattern data is therefore performed.  
      Reference alphabet P in the figure represents a plurality of imaginary divided portions to be obtained by partitioning or dividing into matrix the drawing region Wd on the substrate W. Each of the imaginary divided portions P is set to a size which substantially corresponds to the diameter of the shot function liquid droplet which hits (or reaches) the substrate W. However, the setting of the imaginary divided portion P is arbitrary. Each of the pixel regions  507   a  (see  FIG. 10C , to be described in detail hereinafter) which are formed on the substrate W may alternatively be defined as the imaginary divided portion P.  
      Measurement is made of the amount of function liquid ejection per unit shot to be ejected from each of the nozzles  55  of the function liquid droplet ejection head  17  (S 11  in  FIG. 4 ) by means of an ejection amount measuring apparatus (not shown) which is provided apart from the liquid droplet ejection apparatus  1 . The ejection amount measuring apparatus is made up of: an ejection apparatus which has mounted thereon the function liquid droplet ejection head  17  subjected to measurement and which controls the ejection driving of the function liquid droplet ejection head  17 ; a weight measuring device which measures the weight of the function liquid droplet ejected from the function liquid droplet ejection head  17  toward a receiving receptacle; and a computing apparatus which performs computing processing of the measuring result by the weight measuring device to thereby calculate the function liquid droplet ejection amount per unit shot to be ejected from each of the nozzles  55 . The measuring result of the function liquid droplet ejection amount as obtained by this ejection amount measuring apparatus is inputted through the operation panel  5  of the liquid droplet ejection apparatus  1 .  
      In case each of the pixel regions  507   a  is defined as each of the imaginary divided portions P, measurement is made, in the measurement of the function liquid droplet ejection amount, of the function liquid ejection amount per unit shot to be ejected out of the nozzle group which is made up of a plurality of nozzles  55  corresponding to each of the imaginary divided portions P (each of the pixel regions  507   a ). In other words, the weight of the function liquid ejection amount from each nozzle  55  may be measured to thereby calculate, based on the measuring result, the function liquid ejection amount of each nozzle group or, alternatively, the weight of the function liquid ejection amount from each nozzle group may be measured.  
      In this embodiment, an ejection amount measuring apparatus for measuring purpose is used aside from the liquid droplet ejection apparatus  1 . It may alternatively be so arranged that the liquid droplet ejection apparatus  1  is provided with a weight measuring device. Further, aside from the weight measuring device for the function liquid droplet, it may be so arranged that the function liquid is pictured while in flight (from the time of ejecting out of the nozzle  55  to the time of hitting the workpiece) so as to measure the flight speed of, or the size of, the function liquid droplet. Or else, measurement may be made of the hitting diameter of the function liquid droplet that has hit the inspection workpiece whose surface has been subjected to surface treatment so as to have a given contact angle, to thereby measure the ejected amount of the function liquid.  
      Subsequently, based on the measuring result of the function liquid ejection, and on the ejection pattern data before correction (number of shots of the function liquid droplets relative to the imaginary divided portions P), calculation is made of the amount of the function liquid given (added or injected) to the plurality of imaginary divided portions P by the drawing processing based on the ejection pattern data before correction (S 12 ). Here, the amount of giving the function liquid becomes relatively “large” in the regions on both upper and lower ends.  
      Subsequently, the control block  105  generates matrix data representing the amount of giving the function liquid to the plurality of imaginary divided portions P respectively in multi-valued gradation (S 13 , see  FIG. 6 ). Here, the amount of giving the function liquid is represented in 10 grades from “0” (amount of giving function liquid: large) to “9” (amount of giving function liquid: small).  
      Then, the control block  105  generates 2-valued (binary) matrix data by converting the multi-valued gradation matrix data into 2-valued data (or binary value) (S 14 , see  FIG. 7 ). Binarizing or conversion into 2-valued data (pseudo-gradation processing) is performed by an error diffusion method using, e.g., the Floyd-Steinberg dithering method as a delay and attenuation filter. As a result, the 2-valued data in the imaginary divided portions P partly becomes “0” in the regions on the side of both upper and lower ends, which are drawn thicker or darker, in the drawing regions W. As a general and easy data processing, there may be used a threshold method and a systematic dither method, aside from the error diffusion method. However, by using the error diffusion method, the rougher the region becomes, the more the apparent gradation can be improved. Therefore, it becomes possible for the viewer to hardly realize the drawing unevenness.  
      Finally, the control block  105  corrects the ejection pattern data stored in the RAM  123  such that each 2-valued data in the 2-valued matrix data becomes “0,” i.e., such that the amount of giving the function liquid to each of the imaginary divided portions P representing “large” of the function liquid giving amount decreases (S 15 ). In other words, the ejection pattern data is corrected such that the function liquid droplet is not ejected from each nozzle  55  toward each of the imaginary divided portions P whose 2-valued data has become “0.” According to this processing, the amount of giving the function liquid is decreased toward the entire region in both upper and lower ends where the function liquid was given in a larger quantity. As a result, the drawing unevenness disappears in the substrate W (drawing region Wd) as a whole. In order to prevent the dots from failing to be ejected, correction may be made such that, instead of non-ejection, liquid droplets smaller in liquid amount than ordinary function liquid droplets are ejected. In other words, it may be so arranged that the driving signal smaller in an applied voltage value is generated.  
      By performing drawing processing with the liquid droplet ejection apparatus  1  based on the ejection pattern data as corrected in the manner as described above, each of the imaginary divided portions P where the 2-valued data has become “0” is thinned out so that the function liquid droplets can be ejected to hit each of the remaining imaginary divided portions P. Therefore, it is possible to provide a substrate W in which the viewer can hardly realize the drawing unevenness as a whole (see  FIG. 8 ).  
      In the above embodiment, a description is made about the 2-valued processing. However, the gradation need not be limited to the 2-valued processing. For example, take as an example of 4-valued processing (function liquid giving amount large: “0”—function liquid giving amount small: “3”). Data correction may be made such that the function liquid giving amount is gradually reduced to each of the imaginary divided portions P representing the “large” side in the function liquid giving amount. Namely, data correction is made such that smaller liquid droplets are ejected from each nozzle  55  to each of the imaginary divided portions P whose 4-valued data has become “1,” and that no function liquid is ejected from each nozzle  55  to each of the imaginary divided portions P whose 4-valued data has become “0.” Further, in case the amount of function liquid ejection can be classed into large, medium, and small per each shot in shooting, data correction is made such that the 4-valued data and the amount of function liquid ejection per each shot correspond to each other. In other words, data correction is made such that large liquid droplets are ejected in case 4-valued data is “3,” that medium liquid droplets are ejected in case 4-valued data is “2,” that small liquid droplets are ejected in case 4-valued data is “1,” and that no liquid droplets are ejected in case 4-valued data is “0.” 
      In case each of the pixel regions  507   a  is defined as each of the imaginary divided portions P as described above, the number of shots to each of the imaginary divided portions P whose 2-valued data has become “0” is arranged to be decreased. For example, suppose that the ejection pattern before correction is to eject 10 shots from respective five nozzles  55 , i.e., a total of 50 shots. It may, then, be corrected to eject a total of 49 shots by having one nozzle  55  shoot 9 shots.  
      The ejection pattern data may alternatively be corrected so as to increase the amount of giving the function liquid to each of the imaginary divided portions P where each of the 2-valued data of the 2-valued matrix data represents the function liquid giving amount “small.” The ejection pattern data may also be corrected so that both increase and decrease in the amount of giving the function liquid can be performed.  
      In a manner opposite to the above example, the following method may also be employed. Namely, in case the amount of giving the function liquid to the regions on both sides of the upper and lower ends is relatively “small,” the amount of giving the function liquid is represented, in a manner opposite to the above example, to be “0” for the function liquid giving amount “small” and to be “9” for the function liquid giving amount “large.” The multi-valued gradation matrix data similar to the above example can thus be obtained. Binarization processing (conversion into 2-valued data) is similarly performed to correct the ejection pattern data such that an increase is made (by, e.g., ejecting liquid droplets which are larger in liquid amount than ordinary function liquid droplets) of the amount of giving the function liquid to each of the imaginary divided portions P where each of the 2-valued data in the 2-valued matrix data has become “0.” According to this configuration, the amount of giving the function liquid is increased in the region as a whole on both upper and lower ends where the amount of giving the function liquid was small, whereby the drawing unevenness in the substrate W as a whole can be eliminated.  
      In this embodiment, the amount of giving the function liquid is calculated based on the measuring result of the amount of function liquid ejection. Alternatively, the amount of function liquid ejection may be calculated based on the result of measuring an optical density or a film thickness at each of the imaginary divided portions P of the film forming part (e.g., color layers  508 R,  508 G,  508 B to be described hereinafter, see  FIGS. 10D and 10E ).  
      In other words, drawing processing is performed in advance by the liquid droplet ejection apparatus  1  based on the ejection pattern data before correction, thereby forming a film-forming part on the substrate W. After the drawing processing, the substrate W is transported out of the liquid droplet ejection apparatus  1 , and the optical density or the film thickness is measured by an optical density measuring apparatus or a film thickness measuring apparatus (both not shown). Based on the result of the measuring, the amount of giving the function liquid is calculated. Thereafter, in a manner similar to the above example, the ejection pattern data is corrected, and the subsequent drawing processing is performed.  
      In this manner, the multi-valued gradation matrix data can be adequately generated based on the result of the actual drawing. Alternatively, by measuring the amount of function liquid ejection as in this example, the multi-valued gradation matrix data can be generated without performing the drawing processing. It is thus possible to adequately perform the drawing processing from the first round of the workpiece W.  
      As the optical density measuring apparatus, there may be used one which is constituted by a transmittance measuring device, an absorbance measuring device, or a reflectance measuring device. Further, as the film-thickness measuring apparatus, an optical interference type or of a stylus type may be used. It is of course possible to provide the liquid droplet ejection apparatus  1  with an optical density measuring apparatus or a film thickness measuring apparatus.  
      As described hereinabove, according to the ejection pattern correction processing of this embodiment, the multi-valued gradation matrix data is processed by 2-valued conversion based on the amount of function liquid giving to each of the imaginary divided portions P. Therefore, the corrected ejection pattern can adequately perform the increase and/or decrease in the amount of giving the function liquid to each of the imaginary divided portions P. As a result, the ejection pattern can be corrected so that the viewer hardly realizes the drawing unevenness on the substrate W as a whole.  
      A description will now be made about a color filter, a liquid crystal display device, an organic electroluminescence (EL) device, a plasma display panel (PDP) device, an electron emission device (FED device, SED device) as an electro-optic device (flat panel display) to be manufactured by using the liquid droplet ejection apparatus  1  of this embodiment. A description will further be made about the construction and the method of manufacturing the same by taking, as an example, an active matrix substrate, and the like, which is formed into the above display device. The active matrix substrate means a substrate in which a thin film transistor, a source line and data line to be electrically connected to the thin film transistor are formed.  
      First, a description will be made about the method of manufacturing a color filter which is built or assembled in a liquid crystal display device, an organic EL device, and the like.  FIG. 9  is a flow chart showing the manufacturing steps of the color filter, and  FIGS. 10A  to  10 E are schematic cross-sectional views showing the color filter  500  (filter base member  500 A) of this embodiment, as shown in the order of manufacturing steps.  
      First, at the black matrix forming step (S 101 ), as shown in  FIG. 10A , a black matrix  502  is formed on a substrate (W)  501 . The black matrix  502  is formed of metallic chrome, a laminated member of metallic chrome and chrome oxide, or of resin black, and the like. In order to form the black matrix  502  made of a metallic thin film, sputtering method, vapor deposition method, and the like, may be used. In addition, in case the black matrix  502  made of a resin thin film is formed, gravure printing method, photo-resist method, thermal transfer method, and the like, may be used.  
      Then, at a bank forming step (S 102 ), a bank  503  is formed in a state of being superimposed on the black matrix  502 . In other words, as shown in  FIG. 10B , there is formed a resist layer  504  which is made of a negative type of transparent photosensitive resin so as to cover the substrate  501  and the black matrix  502 . Then, the upper surface thereof is subjected to exposure processing in a state of being coated with a mask film  505  which is formed in a shape of a matrix pattern.  
      As shown in  FIG. 10C , the un-exposed portion of the resist layer  504  is subjected to etching processing to perform patterning of the resist layer  504 , thereby forming a bank  503 . In case the black matrix is formed by the resin black, it becomes possible to commonly use the black matrix and the bank.  
      The bank  503  and the black matrix  502  placed thereunder become a partition wall portion  507   b  which partitions each of pixel regions  507   a , thereby defining a shooting or firing region by the function liquid droplets (i.e., a region in which the function liquid droplets hit the target) at the subsequent color layer forming step to form the color layers (film forming layers)  508 R,  508 G,  508 B with the function liquid droplet ejection head  17 .  
      By performing the above-described black matrix forming step and the bank forming step, the above-described filter base member  500 A can be obtained.  
      As the material for the bank  503 , there is used in this embodiment a resin material whose surface of coated film becomes liquid-repellent (water-repellent). Since the surface of the substrate (glass substrate)  501  is hydrophilic (water-receptive), a variation in shooting the liquid droplet into each of the pixel regions  507   a  enclosed by the bank  503  (partition wall portion  507   b ) is automatically improved in the below-described color layer forming step.  
      At the subsequent color layer forming step (S 103 ), as shown in  FIG. 10D , the function liquid droplet is ejected by the function liquid droplet ejection head  17  to thereby cause the liquid droplet to be shot or fired into each of the pixel regions  507   a  enclosed by the partition wall portion  507   b . At this color layer forming step, the function liquid droplet ejection heads  17  is used to thereby eject three colors of red (R), green (G), and blue (B) function liquids (filter materials). As the arrangement pattern of three colors of R-G-B, there are stripe arrangement, mosaic arrangement, delta arrangement, and the like.  
      Thereafter, after drying processing (processing of heating, and the like), the function liquid is caused to be fixed to thereby form color layers  508 R,  508 G,  508 B of three colors. Once the color layers  508 R,  508 G,  508 B have been formed, the step transfers to a protection film forming step (S 104 ). As shown in  FIG. 10E , a protection film  509  is formed to cover the upper surface of the substrate  501 , the partition wall portion  507   b , and the color layers  508 R,  508 G,  508 B.  
      In other words, after having ejected the protection film coating liquid over that entire surface of the substrate  501  on which the color layers  508 R,  508 B,  508 G are formed, the protection film  509  is formed through the drying step.  
      After having formed the protection film  509 , the color filter  500  transfers to the next step of forming a film such as ITO (Indium Tin Oxide) which forms a transparent electrode.  
       FIG. 11  is a sectional view of an important portion showing a general structure of a passive matrix type of liquid crystal device (liquid crystal device) as an example of a liquid crystal display device employing the above-described color filter  500 . By mounting auxiliary elements such as a liquid crystal driving integrated circuit (IC), a backlight, a supporting member, and the like, on this liquid crystal device  520 , there is obtained a transmission liquid crystal display device as a final product. The color filter  500  is the same as that shown in  FIGS. 10A  to  10 E. Therefore, the same reference numerals are affixed to the corresponding parts/portions and the explanation thereabout is omitted.  
      This liquid crystal device  520  is made up substantially of: a color filter  500 ; an opposite substrate  521  made of a glass substrate, and the like; and a liquid crystal layer  522  which is made up of a super twisted nematic (STN) liquid crystal composition interposed therebetween. The color filter  500  is disposed on the upper side as seen in the figure (i.e., on the side from which the viewer looks at the color filter).  
      Although not shown, on an outside surface of the opposite substrate  521  and of the color filter  500  (i.e., the surface which is opposite to the liquid crystal layer  522 ), there is respectively disposed a polarizer. On an outside of the polarizer which is positioned on the side of the opposite electrode  521 , there is disposed a backlight.  
      On the protection film  509  (on the side of the liquid crystal layer) of the color filter  500 , there are disposed at predetermined intervals a plurality of rectangular first electrodes  523  which are elongated in the left and right direction as seen in  FIG. 11 . A first alignment film  524  is formed so as to cover that side of the first electrode  523  which is opposite to the color filter  500 .  
      On that surface of the opposite substrate  521  which lies opposite to the color filter  500 , a plurality of second electrodes  526  are formed at predetermined intervals to one another in a direction at right angles to the first electrode  523 . A second alignment film  527  is formed so as to cover that surface of the second electrode  526  which is on the side of the liquid crystal layer  522 . The first electrode  523  and the second electrode  526  are formed by a transparent conductive material such as indium tin oxide (ITO).  
      The spacer  528  which is provided inside the liquid crystal layer  522  is a material to keep the thickness of the liquid crystal layer  522  (cell gap) constant. The sealing material  529  is a material to prevent the liquid crystal composition inside the liquid crystal layer  522  from leaking outside. One end of the first electrode  523  is extended to the outside of the sealing material  529  as a running cable  523   a.    
      The crossing portions between the first electrode  523  and the second electrode  526  are the pixels. It is thus so arranged that the color layers  508 R,  508 G,  508 R of the color filter  500  are positioned in these portions which form the pixels.  
      At the ordinary manufacturing steps, the color filter  500  is coated with the patterning of the first electrode  523  and the first alignment film  524 , to thereby form the portion on the side of the color filter  500 . Aside from the above, the opposite substrate  521  is coated with the patterning of the second electrode  526  and the second alignment film  527 , to thereby form the portion on the side of the opposite substrate  521 . Thereafter, the spacer  528  and the sealing material  529  are formed into the portion on the side of the opposite substrate  521 , and the portion on the side of the color filter  500  is adhered to the above-described portion in that state. Then, the liquid crystal which forms the liquid crystal layer  522  is filled from an inlet port of the sealing material  529 , and the inlet port is closed thereafter. Thereafter, both the polarizers and the backlight are laminated.  
      In the liquid droplet ejection apparatus  1  of this embodiment, the spacer material (function liquid) which forms, e.g., the cell gap is coated. And, before the portion on the side of the color filter  500  is adhered to the portion on the side of the opposite substrate  521 , the liquid crystal (function liquid) can be uniformly coated on the region enclosed by the sealing material  529 . It is also possible to carry out the printing of the sealing material  529  with the function liquid droplet ejection head  17 . Further, it is also possible to perform the coating of the first and second alignment films  524  and  527  by the function liquid droplet ejection head  17 .  
       FIG. 12  is a sectional view of an important portion showing a general structure of a second example of the liquid crystal device using a color filter  500  manufactured in this embodiment.  
      What this liquid crystal device  530  is largely different from the above-described liquid crystal device  520  is that the color filter  500  is disposed on the lower side as seen in the figure (i.e., on the side opposite to the side from which the viewer looks at the device).  
      This liquid crystal device  530  is substantially constructed such that a liquid crystal layer  532  which is made of an STN liquid crystal is sandwiched between the color filter  500  and the opposite substrate  531  which is made by a glass substrate, and the like. Although not shown, a polarizer, and the like, are disposed on the outside surface of the opposite substrate  531  and the color filter  500 , respectively.  
      On the protection film  509  (on the side of the liquid crystal layer  532 ) of the color filter  500 , there are disposed at predetermined intervals a plurality of rectangular first electrodes  533  which are elongated in a direction at right angles to the surface of the drawing sheet. A first alignment film  534  is formed so as to cover that side of the first electrode  533  which is on the side of the liquid crystal layer  532 .  
      On that surface of the opposite substrate  531  which lies opposite to the color filter  500 , a plurality of second electrodes  536  are formed at predetermined intervals to one another in a direction at right angles to the first electrode  533 . A second alignment film  537  is formed so as to cover that surface of the second electrode  536  which is on the side of the liquid crystal layer  532 .  
      The liquid crystal layer  532  is provided with a spacer  538  to keep the thickness of the liquid crystal layer  532  constant and a sealing material  539  to prevent the liquid crystal composition inside the liquid crystal  532  layer from leaking outside.  
      In the same manner as in the above-described liquid crystal device  520 , the crossing portions between the first electrode  533  and the second electrode  536  are the pixels. It is thus so arranged that the color layers  508 R,  508 G,  508 B of the color filter  500  are positioned in these portions which form the pixels.  
       FIG. 13  is an exploded perspective view of an important portion showing a general structure of a third example of a transmission thin film transistor (TFT) liquid crystal device using a color filter  500  to which this invention is applied.  
      This liquid crystal device  550  has a construction in which the color filter  500  is disposed on the upper side as seen in the figure (i.e., on the side of the viewer).  
      This liquid crystal device  550  is made up of: the color filter  500 ; an opposite substrate  551  which is disposed to lie opposite to the color filter  500 ; a liquid crystal layer (not shown) which is sandwiched therebetween; a polarizer  555  which is disposed on the upper side (on the side of the viewer) of the color filter  500 ; and a polarizer (not shown) which is disposed on the lower side of the opposite electrode  551 .  
      On the surface (i.e., the surface on the side of the opposite substrate  551 ) of a protection film  509  of the color filter  500 , there is formed an electrode  556  for the liquid crystal driving. This electrode  556  is made of a transparent conductive material such as an ITO, and is formed into an entire-surface electrode which covers the entire region in which the pixel electrodes  560  (to be described later) are formed. An alignment film  557  is disposed in a state of covering the opposite surface of this pixel electrodes  560  of the electrode  556 .  
      On that surface of the opposite substrate  551  which lies opposite to the color filter  500 , there is formed an insulating layer  558 . On this insulating layer  558 , there are formed scanning lines  561  and signal lines  562  in a state of crossing each other at right angles. Pixel electrodes  560  are formed inside the regions enclosed by the scanning lines  561  and the signal lines  562 . In the actual liquid crystal device, there will be disposed an alignment film (not shown) on the pixel electrode  560 .  
      In the notched portion of the pixel electrode  560  and in the portion which is enclosed by the scanning line  561  and the signal line  562 , there are built in or assembled a thin film transistor  563  which is provided with a source electrode, a drain electrode, a semiconductor, and a gate electrode. By applying signals to the scanning line  561  and the signal line  562 , the thin film transistor  563  can be switched on and off so as to control the supply of electric current to the pixel electrode  560 .  
      Although the above-described liquid crystal devices  520 ,  530 , and  550  of each of the above examples is constituted into a transmission type, it may also be constituted into a reflective type of liquid crystal device or into a translucent reflective type of liquid crystal device by providing a reflective layer or a translucent reflective layer, respectively.  
       FIG. 14  is a sectional view of an important portion of an organic EL device (hereinafter simply referred to as a display device  600 ).  
      This display device  600  is substantially constituted by a substrate  601  (W), and on this substrate are laminated a circuit element part  602 , light-emitting element part  603  and a cathode  604 .  
      In this display device  600 , the light emitted from the light-emitting element part  603  toward the substrate  601  passes through the circuit element part  602  and the substrate  601  for ejection toward the viewer, and the light emitted from the light-emitting element part  603  toward the side opposite to the substrate  601  is reflected by the cathode  604  and then passes through the circuit element part  602  and the substrate  601  for ejection toward the viewer.  
      Between the circuit element part  602  and the substrate  601 , there is formed a base protection film  606  which is made of a silicon oxide film. On the top of this base protection film  606  (on the side of the light-emitting element  603 ), there is formed an island-shaped semiconductor film  607  which is made of polycrystalline silicon. In the left and right regions of this semiconductor film  607 , there are respectively formed a source region  607   a  and a drain region  607   b  by high-concentration anion implantation. The central portion which is free from anion implantation becomes a channel region  607   c.    
      In the circuit element part  602 , there is formed a transparent gate insulation film  608  which covers the base protection film  606  and the semiconductor film  607 . In that position on this gate insulation film  608  which corresponds to the channel region  607   c  of the semiconductor film  607 , there is formed a gate electrode  609  which is made up of Al, Mo, Ta, Ti, W, and the like. On the top of this gate electrode  609  and the gate insulation film  608 , there are formed a transparent first interlayer dielectric film  611   a  and a second interlayer dielectric film  611   b . Through the first and the second interlayer dielectric films  611   a  and  611   b , there are formed contact holes  612   a  and  612   b  which are in communication with the source region  607   a  and the drain region  607   b , respectively, of the semiconductor film  607 .  
      On the top of the second interlayer dielectric film  611   b , there is formed, by patterning, a transparent pixel electrode  613  which is made of ITO, and the like. This pixel electrode  613  is connected to the source region  607   a  through the contact hole  612   a.    
      On the top of the first interlayer dielectric film  611   a , there is formed an electric source wiring  614 , which is connected to the drain region  607   b  through the contact hole  612   b.    
      As described hereinabove, the circuit element part  602  has formed therein a driving thin film transistor  615  which is connected to each of the pixel electrodes  613 .  
      The above-described light-emitting element part  603  is substantially made up of: a function layer  617  which is laminated on each of the plurality of pixel electrodes  613 ; and a bank part  618  which is provided between each of the pixel electrodes  613  and the function layers  617  to thereby partition each of the function layers  617 .  
      The light-emitting element is constituted by these pixel electrodes  613 , the function layer  617 , and the cathode  604  which is disposed on the function layer  617 . The pixel electrode  613  is formed into a substantial rectangle as seen in plan view, and the bank part  618  is formed between each of the pixel electrodes  613 .  
      The bank part  618  is made up of: an inorganic-matter bank layer  618   a  (first bank layer) which is formed by inorganic materials such as SiO, SiO 2 , and TiO 2 ; and an organic-matter bank layer  618   b  (second bank layer) which is trapezoidal in cross section and which is formed by a resist superior in heat-resistance and solvent-resistance such as an acrylic resin, and a polyimide resin. Part of this bank part  618  is formed in a state of being overlapped with the peripheral portion of the pixel electrode  613 .  
      Between each of the bank parts  618 , there is formed an opening part  619  which is gradually enlarged in an upper direction relative to the pixel electrode  613 .  
      The function layer  617  is made up of: a hole injection/transport layer  617   a  which is formed inside the opening part  619  in a state of being laminated on the pixel electrode  613 ; and a light-emitting layer  617   b  which is formed on this hole injection/transport layer  617   a . It may be so arranged that other function layers having other functions are further formed adjacent to the light-emitting layer  617   b . For example, an electron transport layer may be formed.  
      The hole injection/transport layer  617   a  has a function of transporting holes from the pixel electrode  613  side for injection into the light-emitting layer  617   b . This hole injection/transport layer  617   a  is formed by ejecting the first composition of matter (function liquid) containing therein the hole injection/transport layer forming material. As the hole injection/transport layer forming material, there may be used a known material.  
      The light-emitting layer  617   b  emits light of red (R), green (G) or blue (B), and is formed by ejecting the second composition of matter (function liquid) containing the light-emitting layer forming material (light-emitting material). As the solvents for the second composition of matter (nonpolar solvent), it is preferable to use a known material which is insoluble to the hole injection/transport layer  120   a . By using this kind of nonpolar solvent as the second composition of matter of the light-emitting layer  617   b , the light-emitting layer  617   b  can be formed without dissolving the hole injection/transport layer  617   a  again.  
      The light-emitting layer  617   b  is so arranged that the holes injected from the hole injection/transport layer  617   a  and the electron injected from the cathode  604  get bonded again in the light-emitting layer to thereby emit light.  
      The cathode  604  is formed in a state to cover the entire surface of the light-emitting element part  603  and, in cooperation with the pixel electrode  613 , functions to cause the electric current to flow to the function layer  617 . A sealing member (not shown) is disposed on the top of this cathode  604 .  
      A description will now be made about the manufacturing steps of the above-described display device  600  with reference to FIGS.  15  to  23 .  
      As shown in  FIG. 15 , this display device  106  is manufactured through the following steps, i.e., a bank part forming step (S 111 ), a surface treatment step (S 112 ), a hole injection/transport layer forming step (S 113 ), a light-emitting layer forming step (S 114 ), and an opposite electrode forming step (S 115 ). The manufacturing steps need not be limited to the ones shown above; some steps may be omitted or others added if necessary.  
      First, at the bank part forming step (S 111 ), an inorganic-matter bank layer  618   a  is formed on the second interlayer dielectric film  611   b  as shown in  FIG. 16 . This inorganic-matter bank layer  618   a  is formed, after having formed an inorganic-matter film on the forming position, by patterning the inorganic-matter film by means of photolithography, and the like. At this time, part of the inorganic-matter bank layer  618   a  is formed so as to overlap with the peripheral portion of the pixel electrode  613 .  
      Once the inorganic-matter bank layer  618   a  has been formed, an organic-matter bank layer  618   b  is formed on the top of the inorganic-matter bank layer  618   a  as shown in  FIG. 17 . This organic-matter bank layer  618   b  is formed, as in the case of the inorganic-matter bank layer  618   a , by patterning by means of photolithography, and the like.  
      The bank part  618  is formed as described above. As a result, there is formed an opening part  619  which opens in the upward direction relative to the pixel electrode  613 . This opening part  619  defines a pixel region.  
      At the surface treatment step (S 112 ), the liquid-affinity processing (treatment to gain affinity to liquid) and the liquid-repellency processing (treatment to gain repellency to liquid) are performed. The region in which the liquid-affinity processing is to be performed are the first laminated part  618   aa  of the inorganic-matter bank layer  618   a  and the electrode surface  613   a  of the pixel electrode  613 . These regions are subjected to surface treatment to obtain liquid affinity by means, e.g., of plasma processing using oxygen as the processing gas. This plasma processing also serves the purpose of cleaning the ITO which is the pixel electrode  613 .  
      The liquid-repellency processing, on the other hand, is performed on the wall surface  618   s  of the organic-matter bank layer  618   b  and on the upper surface  618   t  of the organic-matter bank layer  618   b . By means of plasma processing with, e.g., methane tetrafluoride as the processing gas, the surface is subjected to fluoridizing processing (processed to obtain liquid-repellent characteristic).  
      By performing this surface processing step, it becomes possible for the function liquid droplet to reach (or hit) the pixel region in a surer manner when the function layer  617  is formed by using the function liquid droplet ejection head  17 . It also becomes possible to prevent the function liquid droplet that has hit the pixel region from flowing out of the opening part  619 .  
      By going through the above-described steps, the display device substrate  600 A can be obtained. This display device substrate  600 A is mounted on the setting table  22  of the liquid droplet ejection apparatus  1  as shown in  FIG. 2 , and the following hole injection/transport layer forming step (S 113 ) and the light-emitting layer forming step (S 114 ) are performed.  
      As shown in  FIG. 18 , at the hole injection/transport layer forming step (S 113 ), the first composition of matter containing therein the hole injection/transport layer forming material is ejected from the function liquid droplet ejection head  17  into each of the opening parts  619  as a pixel region. Thereafter, as shown in  FIG. 19 , drying process and heat-treatment process are performed in order to evaporate the polar solvent contained in the first composition of matter, whereby the hole injection/transport layer  617   a  is formed on the pixel electrode (electrode surface  613   a )  613 .  
      A description will now be made about the light-emitting layer forming step (S 114 ). At this light-emitting layer forming step, as described above, in order to prevent the hole injection/transport layer  617   a  from getting dissolved again, there is used a non-polar solvent which is insoluble to the hole injection/transport layer  617   a  as a solvent for the second composition of matter to be used in forming the light-emitting layer.  
      On the other hand, since the hole injection/transport layer  617   a  is low in affinity to the non-polar solvent, it will be impossible to closely adhere the hole injection/transport layer  617   a  to the light-emitting layer  617   b  or to uniformly coat the light-emitting layer  617   b  even if the second composition of matter containing therein the non-polar solvent is ejected onto the hole injection/transport layer  617   a.    
      As a solution, in order to enhance the affinity of the surface of the hole injection/transport layer  617   a  to the non-polar solvent and to the light-emitting layer forming material, it is preferable to perform the surface treatment (treatment to improve the quality of the surface) before forming the light-emitting layer. This surface treatment is performed by coating the hole injection/transport layer  617   a  with a solvent which is the same as, or similar to, the non-polar solvent of the second composition of matter to be used in forming the light-emitting layer, and then drying it.  
      By performing this kind of treatment, the surface of the hole injection/transport layer  617   a  easily conforms to the non-polar solvent. It becomes thus possible to uniformly coat, at the subsequent step, the hole injection/transport layer  617   a  with the second composition of matter containing therein the light emitting layer forming material.  
      Thereafter, as shown in  FIG. 20 , the second composition of matter containing therein the light emitting layer forming material corresponding to one of the colors (blue in the example in  FIG. 20 ) is implanted into the pixel region (opening part  619 ) as a function liquid droplet by a predetermined amount. The second composition of matter implanted into the pixel region gets spread over the hole injection/transport layer  617   a  to thereby fill the opening part  619 . Even if the second composition of matter goes out of the pixel region to thereby hit the upper surface  618   t  of the bank part  618 , this upper surface  618   t  has been subject to the liquid-repellent treatment as described above. Therefore, the second composition of matter is likely to be easily rolled into the opening part  619 .  
      Thereafter, by performing the drying step, the second composition of matter after ejection is subjected to drying processing to thereby evaporate the non-polar solvent contained in the second composition of matter. As shown in  FIG. 21 , the light-emitting layer  617   b  is formed on the top of the hole injection/transport layer  617   a . In the example shown in the figure, a light-emitting layer  617   b  corresponding to the color of blue (B) is formed.  
      Similarly, by using the function liquid droplet ejection head  17 , steps similar to those in the case of the light-emitting layer  617   b  corresponding to the color of blue (B) mentioned above are sequentially performed as shown in  FIG. 22  to thereby form the light-emitting layers  617   b  corresponding to the other colors (of red (R) and green (G)). The order of steps of forming the light-emitting layer  617   b  are not limited to those exemplified, but may be formed in an arbitrary order. For example, the order of forming may be determined depending on the light-emitting layer forming materials. The arrangement pattern of the three colors of R, G, B may be of a stripe arrangement, a mosaic arrangement, a delta arrangement, and the like.  
      In the manner as described hereinabove, the function layer  617 , i.e., the hole injection/transport layer  617   a  and the light-emitting layer  617   b , is formed on the pixel electrode  613 . Then, the process transfers to the opposite electrode forming step (S 115 ).  
      At the opposite electrode forming step (S 115 ), as shown in  FIG. 23 , the cathode  604  (opposite electrode) is formed over the entire surfaces of the light-emitting layer  617   b  and the organic matter bank layer  618   b  by means, e.g., of vapor deposition method, sputtering method, chemical vapor deposition (CVD) method, and the like. This cathode  604  is constituted in this embodiment by laminating, e.g., a calcium layer and an aluminum layer.  
      On an upper part of the cathode  604 , there are provided an Al film and an Ag film as electrodes and, on the top thereof, a protection film for preventing oxidation such as an SiO 2  film, and an SiN film, depending in necessity.  
      After having formed the cathode  604  as described above, a sealing process for sealing the upper portion of the cathode  604  with a sealing material, a wiring processing, and the like, are performed to thereby obtain the display device  600 .  
       FIG. 24  is an exploded perspective view showing an important part of the plasma type of display device (PDP device, hereinafter, simply referred to as a display device  700 ). In  FIG. 24 , the display device  700  is shown in a partly cut away state.  
      This display device  700  is substantially made up of a first substrate  701  and a second substrate  702  which are disposed to lie opposite to each other, as well as a discharge display part  703  which is formed therebetween. The discharge display part  703  is constituted by a plurality of discharging chambers  705 . Among these plurality of discharging chambers  705 , the three chambers  705  of a red-color discharging chamber  705 R, a green-color discharging chamber  705 G, and a blue-color discharging chamber  705 B are disposed as a set to make one pixel.  
      On the upper surface of the first substrate  701 , there are formed address electrodes  706  in a stripe form at predetermined intervals from one another. A dielectric layer  707  is formed to cover these address electrodes  706  and the upper surface of the first substrate  701 . On the dielectric layer  707 , there are vertically disposed partition walls  708  which are positioned between respective address electrodes  707  in a manner to lie along the respective address electrodes  706 . Some of these partition walls  708  extend on both widthwise sides of the address electrodes  706  and others (not shown) extend at right angles to the address electrodes  706 .  
      The regions which are partitioned by these partition walls  708  form the discharge chambers  705 .  
      Inside the discharge chambers  705 , there are disposed fluorescent bodies  709 . The fluorescent bodies  709  emit luminescent light of any one of colors of red (R), green (G) and blue (B). At the bottom of the red-color discharging chamber  705 R, there are disposed red-color fluorescent bodies  709 R, at the bottom of the green-color discharging chamber  705 G, there are disposed green-color fluorescent bodies  709 G, and at the bottom of the blue-color discharging chamber  705 B, there are disposed blue-color fluorescent bodies  709 B, respectively.  
      On the lower side of the second substrate  702  as seen in the figure, there are formed a plurality of display electrodes  711  in a direction crossing the address electrodes  706  at right angles at predetermined intervals from one another. In a manner to cover them, there are formed a dielectric layer  712  and a protection film  713  which is made of MgO, and the like.  
      The first substrate  701  and the second substrate  702  are oppositely adhered to each other in a state in which the address electrodes  706  and the display electrodes  711  cross each other at right angles. The address electrodes  706  and the display electrodes  711  are connected to an AC power source (not shown).  
      By charging electricity to each of the electrodes  706  and  711 , the fluorescent bodies  709  are caused to emit light at the discharge display part  703  through excitation, whereby color display becomes possible.  
      In this embodiment, the address electrodes  706 , the display electrodes  711 , and the fluorescent bodies  709  can be formed by using the liquid droplet ejection apparatus  1  as shown in  FIG. 2 . A description will now be made about an example of steps for manufacturing the address electrodes  706  on the first substrate  701 .  
      In this case, the following steps are performed in a state in which the first substrate  701  is placed on the setting table  22  of the liquid droplet ejection apparatus  1 .  
      First, by means of the function liquid droplet ejection head  17 , the liquid material (function liquid) containing therein a material for forming the conductive film wiring is caused to hit the address electrode forming region as the function liquid droplets. This liquid material is prepared as the electrically conductive film wiring (wiring formed by electrically conductive film) by dispersing electrically conductive fine particles of metals, and the like, into a dispersion medium. As the electrically conductive fine particles, there are used metallic fine particles containing therein gold, silver, copper, palladium, nickel, and the like, or an electrically conductive polymer, and the like.  
      Once all of the address electrode forming regions in which the liquid material is scheduled to be filled have been filled with the liquid material, the liquid material after ejection is dried to evaporate the dispersion medium contained in the liquid material, whereby the address electrodes  706  are formed.  
      An example of the address electrodes  706  has been given hereinabove, but the display electrodes  711  and the fluorescent bodies  709  can also be formed by the above-described steps.  
      In forming the display electrodes  711 , a liquid material (function liquid) containing therein the material for forming the conductive film wiring is caused to hit the display electrode forming region as the function liquid droplets, in a similar manner as in the case of the address electrodes  706 .  
      In forming the fluorescent bodies  709 , on the other hand, a liquid material containing therein a fluorescent material (function liquid) corresponding to each of the colors (R, G, B) is ejected from the three function liquid droplet ejection heads  17  as liquid droplets to thereby cause them to hit the discharge chambers  705  of corresponding colors.  
       FIG. 25  is a sectional view showing an important part of the electron emission device (also referred to as an FED device or SED device; hereinafter simply referred to as a display device  800 ).  FIG. 25  shows the display device  800  partly in section.  
      The display device  800  is made up of a first substrate  801  and a second substrate  802  which are disposed opposite to each other, as well as a field emission display part  803  which is formed therebetween. The field emission display part  803  is constituted by a plurality of electron emission parts  805  which are arranged in matrix.  
      On the upper surface of the first substrate  801 , there are formed first element electrodes  806   a  and second element electrodes  806   b  which constitute cathode electrodes  806 , in a manner to cross each other at right angles. In each of the portions partitioned by the first element electrodes  806   a  and the second element electrodes  806   b , there is formed a conductive film  807  with a gap  808  formed therein. In other words, a plurality of electron emission parts  805  are constituted by the first element electrodes  806   a , the second element electrodes  806   b , and the conductive film  807 . The conductive film  807  is made, e.g., of palladium oxide (PdO), and the like, and the gap  808  is formed by the work called forming, and the like, after having formed the conductive film  807 .  
      On the lower surface of the second substrate  802 , there is formed an anode electrode  809  which lies opposite to the cathode electrode  806 . On the lower surface of the anode electrode  809 , there is formed a lattice-shaped bank part  811 . In each of the downward-orienting openings  812  enclosed by the bank part  811 , there is disposed a fluorescent member  813  in a manner to correspond to the electron emission part  805 . The fluorescent body  813  emits light of colors of either red (R), green (G), and blue (B). In each of the opening parts  812 , there is disposed a red-color fluorescent body  813 R, a green-color fluorescent body  813 G, and a blue-color fluorescent body  813 B in a predetermined pattern.  
      The first substrate  801  and the second substrate  802  constituted as described above are adhered to each other with a very small gap therebetween. In this display device  800 , the electrons to be emitted from the first element electrode  806   a  and the second element electrode  806   b  as the cathode are excited and caused to emit light through the conductive film  807  (gap  808 ) by causing them to hit the fluorescent body  813  formed on the anode electrode  809  which is the anode. Color display is thus made possible.  
      In this case, too, as in the other embodiments, the first element electrode  806   a , the second element electrode  806   b , the conductive film  807 , and the anode electrode  809  can be formed by using the liquid droplet ejection apparatus  1 , and also fluorescent bodies  813 R,  813 G,  813 B of each color can be formed by using the liquid droplet ejection apparatus  1 .  
      The first element electrode  806   b , the second element electrode  806   b , and the conductive film  807  are of a flat shape as shown in  FIG. 26A . In forming them, a bank part BB is formed (in photolithography method), as shown in  FIG. 26B , while leaving in advance the portions in which the first element electrode  806   a , the second element electrode  806   b  and the conductive film  807  are to be formed. Then, the first element electrode  806   a  and the second element electrode  806   b  are formed (with ink jet method using the liquid droplet ejection apparatus  1 ) into the groove portions constituted by the bank parts BB. After drying the solvent therein to thereby form the film, the conductive film  807  is formed (with ink jet method using the liquid droplet ejection apparatus  1 ). Thereafter, the bank parts BB are removed (in ashing processing), and the process proceeds to the above-described forming steps. In the same manner as in the case of the above-described organic EL device, it is preferable to perform liquid-affinity processing to the first substrate  801  and the second substrate  802  as well as the liquid-repellency processing to the bank parts  811 , and BB.  
      As other electro-optic devices, there are included devices of forming metallic wiring, forming lens, forming resist, forming optical dispersion body, and the like. By using the above-described liquid droplet ejection apparatus  1  in manufacturing the various electro-optic devices, such devices can be manufactured at a higher efficiency.