JP2009151219A - Head selection method of functional liquid drop ejection head, head unit, liquid drop ejection device, method of manufacturing electro-optical device, and electro-optical device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a head selection method of a liquid drop ejection device, by which a proportion of defective heads can be suppressed while ensuring high-quality drawing results without color unevenness. <P>SOLUTION: The head selection method of functional liquid drop ejection heads 17 aims to select a plurality of functional liquid drop ejection heads 17 from a great number of heads as candidates to be mounted, and the method includes: a characteristic inspection step of inspecting characteristics of liquid drop ejection amounts in the great number of candidate heads; and a head selection step of selecting a plurality of functional liquid drop ejection heads 17 on the basis of the characteristics of the liquid drop ejection amount of each inspected candidate head in accordance with the selection standard for each color determined on the basis of the correlation between the characteristics of liquid drop ejection amounts of the candidate heads and generation degrees of color unevenness in each color of the functional liquid. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention provides a functional liquid for selecting a plurality of functional liquid droplet ejection heads from a large number of candidate heads as mounting candidates in order to eliminate color unevenness when mounting a plurality of ink jet type functional liquid droplet ejection heads on a carriage. The present invention relates to a head selection method for a droplet discharge head, a head unit, a droplet discharge device, a method for manufacturing an electro-optical device, and an electro-optical device.

Conventionally, although this type of head selection method is not known, there is known an ink jet printer in which a plurality of head units having a plurality of recording heads mounted on a carriage are provided and six color inks are drawn by the plurality of head units. (See Patent Document 1). In this ink jet printer, in order to obtain a uniform print image quality, print heads having a certain level of characteristics are selected and mounted on a common carriage.
JP 2003-39704 A

  By the way, the functional liquid for each color for drawing has a difference in characteristics in the functional liquid itself. Depending on the visual sensitivity to human colors, the relationship between the difference in the amount of landing of functional fluid and the color unevenness varies. That is, there is a difference in the degree of color unevenness corresponding to the droplet discharge amount characteristic of the head. Therefore, when the above-described head selection method for an ink jet printer is used for the head selection method for the functional liquid droplet ejection head, the ratio of defective heads increases and a uniform recording image quality cannot be obtained. There is a problem in that it is not possible to perform drawing with high accuracy in drawing of the functional liquid that has a large influence on the droplet discharge amount characteristic. For example, when RGB three colors are drawn using functional droplet discharge heads having the same droplet discharge amount characteristics, the RG2 color can be drawn normally, but the B color is greatly affected by the droplet discharge amount characteristics. However, there is a problem that even if the discharge amount difference (landing amount difference) is the same, visual color unevenness, uneven stripes, and the like occur in the drawing result.

  The present invention relates to a method of selecting a functional liquid droplet ejection head, a head unit, a liquid droplet ejection apparatus, and an electro-optical device capable of suppressing the ratio of defective heads while guaranteeing a good quality drawing result without color unevenness. It is an object to provide a method and an electro-optical device.

  The head selection method of the functional liquid droplet ejection head according to the present invention includes a plurality of ink jet type functional liquid droplet ejection heads mounted on a carriage from a plurality of candidate heads as mounting candidates in order to eliminate color unevenness. Functional droplet ejection head sorting method for functional droplet ejection heads, including a characteristic inspection process for inspecting droplet ejection volume characteristics in a large number of candidate heads, droplet ejection volume characteristics in candidate heads, and functions Sorting multiple functional droplet ejection heads based on the droplet ejection volume characteristics of each tested candidate head based on the color-specific sorting criteria set based on the correlation with the degree of color unevenness for each liquid color And a head sorting step.

  According to this configuration, the functional liquid droplet ejection head used for ejecting each color functional liquid according to the color-specific selection criteria set based on the correlation between the liquid droplet ejection amount characteristics and the degree of color unevenness for each color. Therefore, the function liquid droplet ejection heads can be selected in consideration of the characteristics of each color functional liquid. Therefore, it is possible to obtain a uniform recording image quality and to assign a high-precision functional liquid droplet ejection head to a functional liquid that is greatly affected by the liquid droplet ejection volume characteristics, so that high quality drawing is achieved without color unevenness in each color. The result can be obtained. Further, the ratio of defective heads can be suppressed.

  In this case, in the characteristic inspection step, in a large number of candidate heads, from the discharge amount detection step of detecting the droplet discharge amount of each discharge nozzle in the nozzle row of the candidate head, and the detected droplet discharge amount of each discharge nozzle, And a characteristic acquisition step of acquiring a droplet discharge amount characteristic of the functional droplet discharge head.

  According to this configuration, by considering the droplet discharge amount of each discharge nozzle, it is possible to appropriately inspect the droplet discharge amount characteristic.

  In this case, in the discharge amount inspection step, it is preferable to obtain the droplet discharge amount of each discharge nozzle from an approximate characteristic diagram based on the measurement result.

  According to this configuration, it is not necessary to measure all the discharge nozzles by obtaining the droplet discharge amount of each discharge nozzle of the nozzle row from the approximate characteristic diagram based on the measurement results of several discharge nozzles. The droplet discharge amount of the discharge nozzle can be acquired efficiently.

  In this case, in the discharge amount inspection process, the approximate characteristic diagram can be derived from the result of measuring all of the two or more discharge nozzles at both ends of the nozzle row and decimating each discharge nozzle in the remaining intermediate portion. preferable.

  According to this configuration, it is possible to acquire a strict value for the discharge nozzles at both ends that have a large influence on color unevenness.

  In this case, in the characteristic acquisition process, in a large number of candidate heads, the variation in the droplet discharge amount of each discharge nozzle is within a predetermined variation range, and the average value of the droplet discharge amount of each discharge nozzle , Based on whether or not the difference between the two droplet discharge amounts of the two discharge nozzles located at both ends of the nozzle row satisfies the intercept range condition that falls within a predetermined tolerance range, It is preferable to obtain the rank as a droplet discharge amount characteristic.

  According to this configuration, it is possible to acquire the droplet discharge amount characteristics of the candidate head based on an accurate and appropriate reference. Moreover, by ranking, each candidate head can be easily compared.

  In this case, the two droplet discharge amounts to be compared as to whether or not the intercept range condition is satisfied are the average values of the droplet discharge amounts at two or more discharge nozzles located at corresponding ends of the nozzle row, respectively. It is preferable that

  According to this configuration, it is possible to reduce the variation in the droplet discharge amount of one discharge nozzle, and it is possible to accurately compare whether or not the intercept range condition is satisfied.

  In this case, the functional liquid is a functional liquid of R, G, and B colors, and the B color has a selection criterion for selecting a functional liquid droplet ejection head having better liquid droplet ejection characteristics than the R and G colors. It is preferable.

  According to this configuration, the B-color functional liquid that has a large influence on the droplet discharge amount characteristic has a strict selection criterion for selecting a functional droplet discharge head having a good droplet discharge amount characteristic, so that each color is further colored. A good quality drawing result can be obtained without unevenness.

  A head unit of the present invention comprises a plurality of functional liquid droplet ejection heads selected by the functional liquid droplet ejection head head sorting method, and a carriage on which the plurality of functional liquid droplet ejection heads are mounted. Features.

  The droplet discharge device of the present invention includes a plurality of the head units described above, and an XY movement mechanism that moves the workpiece relative to the plurality of head units in the X-axis direction and the Y-axis direction. Features.

  According to this configuration, the yield of the workpiece can be improved by using the plurality of functional liquid droplet ejection heads selected using the head selection method capable of obtaining a good quality drawing result.

  A method for manufacturing an electro-optical device according to the present invention is characterized in that a film forming portion is formed by functional droplets on a workpiece using the above-described droplet discharge device.

  An electro-optical device according to the present invention is characterized in that a film-forming portion made of functional droplets is formed on a workpiece using the above-described droplet discharge device.

  According to this configuration, a high-quality electro-optical device can be efficiently manufactured. In addition, as a functional material, the light emitting material (Electro-Luminescence light emitting layer / hole injection layer) of the organic EL device, the filter material (filter element) of the color filter used for the liquid crystal display device, the electron emission device (Field Emission) Display, FED) fluorescent material (phosphor), fluorescent material (phosphor) of PDP (plasma display panel) device, electrophoretic material (electrophore) of electrophoretic display device, etc. A liquid material that can be discharged by an inkjet head). Examples of the electro-optical device (Flat Panel Display, FPD) include an organic EL device, a liquid crystal display device, an electron emission device, a PDP device, and an electrophoretic display device.

  Hereinafter, with reference to the accompanying drawings, a droplet discharge apparatus to which a head selecting method for a functional droplet discharge head according to an embodiment of the present invention is applied will be described. The liquid droplet ejection apparatus according to the present embodiment is incorporated in a flat panel display production line. For example, a functional liquid droplet ejection head (liquid droplet ejection) into which a functional liquid that is a special ink or a light-emitting resin liquid is introduced. Head) is used to form a color filter of a liquid crystal display device, a light emitting element that becomes each pixel of an organic EL device, and the like.

  As shown in FIGS. 1 and 2, the droplet discharge device 1 is disposed on an X-axis support base 2 supported by a stone surface plate, and extends in the X-axis direction, which is the main scanning direction, An X-axis table 11 that moves W in the X-axis direction (main scanning direction), and a pair (two) of Y-axis support bases that span the X-axis table 11 via a plurality of support columns 4 3, the Y-axis table 12 extending in the Y-axis direction which is the sub-scanning direction, and ten carriage units 51 on which a plurality of functional liquid droplet ejection heads 17 are mounted. The carriage unit 51 is suspended from the Y-axis table 12. Then, the functional droplet ejection head 17 is driven to eject in synchronization with the driving of the X-axis table 11 and the Y-axis table 12, thereby ejecting R, G, B three-color functional droplets and predetermined drawing on the workpiece W. A pattern is drawn. The XY movement mechanism described in the claims is composed of an X-axis table 11 and a Y-axis table 12.

  The droplet discharge device 1 includes a maintenance device 5 including a flushing unit 14, a suction unit 15, a wiping unit 16, and a discharge performance inspection unit 18, and these units are used for maintenance of the functional droplet discharge head 17. The function of the functional liquid droplet ejection head 17 is maintained and recovered. Of the units constituting the maintenance device 5, the flushing unit 14 and the discharge performance inspection unit 18 are mounted on the X-axis table 11, the suction unit 15 and the wiping unit 16 are detached from the X-axis table 11, and Y The carriage unit 51 is disposed on a gantry 6 at a position where the carriage unit 51 can be moved by the axis table 12 (strictly speaking, the discharge performance inspection unit 18 has a stage unit 77 described later on the X-axis table 11. And the camera unit 78 is supported by the Y-axis support base 3).

  The flushing unit 14 includes a pair of pre-drawing flushing units 111 and 111 and a regular flushing unit 112, and is performed immediately before ejection of the functional liquid droplet ejection head 17 or when drawing work is suspended such as when the workpiece W is replaced. In this case, the functional liquid droplet ejection head 17 receives the waste ejection (flushing). The suction unit 15 includes a plurality of divided suction units 141 and forcibly sucks the functional liquid from the discharge nozzle 98 of each functional liquid droplet discharge head 17. The wiping unit 16 has a wiping sheet 151 and wipes the nozzle surface 97 of the functional liquid droplet ejection head 17 after suction. The ejection performance inspection unit 18 includes a stage unit 77 on which an inspection sheet 83 that receives functional droplets ejected from the functional droplet ejection head 17 is mounted, and a camera unit 78 that inspects functional droplets on the stage unit 77 by image recognition. The ejection performance (the presence or absence of ejection and the flight curve) of the functional liquid droplet ejection head 17 is inspected.

  Hereinafter, components of the droplet discharge device 1 will be described. As shown in FIG. 1 or FIG. 2, the X-axis table 11 includes a set table 21 for setting a workpiece W, an X-axis first slider 22 for slidably supporting the set table 21 in the X-axis direction, and the flushing described above. An X-axis second slider 23 that slidably supports the unit 14 and the discharge performance inspection unit 18 in the X-axis direction, and a set table 21 (work W) extending in the X-axis direction via the X-axis first slider 22 And a pair of left and right X-axis linear motors (not shown) that move the flushing unit 14 and the stage unit 77 in the X-axis direction via the X-axis second slider 23, and an X-axis linear motor. A pair of (two) X-axis common support bases 24 arranged in parallel to guide the movement of the X-axis first slider 22 and the X-axis second slider 23. To have.

  The set table 21 includes a suction table 31 for sucking and setting the work W, and a θ table 32 for supporting the suction table 31 and correcting the position of the work W set on the suction table 31 in the θ-axis direction. Yes. Further, the pre-drawing flushing unit 111 is attached to each of a pair of sides parallel to the Y-axis direction of the set table 21.

  The Y-axis table 12 includes 10 bridge plates 52 each of which has 10 carriage units 51 suspended therein, 10 sets of Y-axis sliders (not shown) that support the 10 bridge plates 52 in both ends, A pair of Y-axis linear motors (not shown) are provided on the pair of Y-axis support bases 3 and move the bridge plate 52 in the Y-axis direction via 10 sets of Y-axis sliders. Further, the Y-axis table 12 causes the functional liquid droplet ejection head 17 to face the maintenance device 5 in addition to sub-scanning the functional liquid droplet ejection head 17 at the time of drawing via each carriage unit 51.

  When the pair of Y-axis linear motors are driven (synchronously), each Y-axis slider translates in the Y-axis direction simultaneously with the pair of Y-axis support bases 3 as a guide. As a result, the bridge plate 52 moves in the Y-axis direction, and the carriage unit 51 moves in the Y-axis direction at the same time. In this case, by controlling the driving of the Y-axis linear motor, each carriage unit 51 can be moved independently and individually, or ten carriage units 51 can be moved together. It is.

  Each carriage unit 51 includes a head unit 13 having a plurality of functional liquid droplet ejection heads 17, a θ rotation mechanism 61 that supports the head unit 13 so as to be capable of θ correction (θ rotation), and a θ rotation mechanism 61. And a suspension member 62 that supports the unit 13 on the Y-axis table 12 (each bridge plate 52).

  As shown in FIGS. 2 and 3, the head unit 13 includes twelve functional liquid droplet ejection heads 17 and a carriage plate (carriage) 53 on which the twelve functional liquid droplet ejection heads 17 are arranged and fixed. ing. The twelve functional liquid droplet ejection heads 17 are divided into two groups in the Y-axis direction, and six heads are arranged in a stepped manner in the X-axis direction. The six functional liquid droplet ejection heads 17 belonging to each head group 54 are arranged to oppose each other in the nozzle row 98b direction, and a plurality of functional liquid droplet ejection heads 17 can be efficiently arranged on the carriage plate 53. In addition, the drawing process can be performed efficiently. The two functional liquid droplet ejection heads 17 of each color of each head group 54 are connected in the X-axis direction to form one drawing line.

  The 12 × 10 functional liquid droplet ejection heads 17 mounted on the head unit 13 correspond to any of the R, G, and B functional liquids, and each of the four functional liquid droplet ejection heads 17 (each A plurality of divided drawing lines for each color can be drawn on the work W by the head group 54 (two for each color). By two sub-scans of the all-function liquid droplet ejection heads 17 (12 × 10), RGB three-color drawing lines that are continuous in the Y-axis direction are formed. That is, for each color, the drawing between the two functional liquid droplet ejection heads 17 in one head group 54 and the two functional liquid droplet ejection heads 17 in the other head group 54 is divided in the Y-axis direction. A gap corresponding to two lines is provided, and between adjacent head groups 54 in the head units 13 different from each other, similarly, a gap corresponding to two divided drawing lines is provided in the Y-axis direction. The length of the drawing line corresponds to the width of the maximum size workpiece W that can be mounted on the set table 21.

  As shown in FIG. 4, the functional liquid droplet ejection head 17 has a so-called double structure, a functional liquid introduction part 91 having two connection needles 92, and a dual head substrate that is continuous with the functional liquid introduction part 91. 93, and a head main body 94 which is connected to the lower side of the functional liquid introducing portion 91 and has an in-head flow path filled with the functional liquid therein. The connection needle 92 is connected to a functional liquid tank (not shown), and supplies the functional liquid to the functional liquid introduction unit 91. The head main body 94 includes a cavity 95 (piezoelectric piezoelectric element) and a nozzle plate 96 having a nozzle surface 97 in which a large number of discharge nozzles 98 are opened. When the functional liquid droplet ejection head 17 is ejected, a functional liquid droplet is ejected from the ejection nozzle 98 by the pump action of the cavity 95 (a voltage is applied to the piezoelectric element).

  The nozzle surface 97 is formed with a first nozzle row 99a and a second nozzle row 99b made up of a large number of discharge nozzles 98 in parallel with each other. The two nozzle rows 99a and 99b are displaced from each other by a half nozzle pitch. The two nozzle rows 99a and 99b each have 10 invalid discharge nozzles that are not used for the drawing process at both ends, thereby suppressing variations in the droplet discharge amount on the nozzle rows 99a and 99b. And a higher quality drawing process can be performed. In the present embodiment, the “nozzle row” referred to in the claims is a combination of the first nozzle row 99a and the second nozzle row 99b. Therefore, hereinafter, the first nozzle row 99a and the second nozzle row 99b are collectively referred to simply as the nozzle row 99.

  In the drawing operation of the droplet discharge device 1, first, the first drawing operation (forward movement path) is performed while moving the workpiece W in the X-axis direction (to the rear side in FIG. 1) by the X-axis table 11. Thereafter, the head unit 13 is moved by two heads (divided drawing lines) in the Y-axis direction (sub-scanning), and the workpiece W is moved again in the X-axis direction (toward the front side in FIG. 1), while the second A drawing operation (return path) is performed. Then, the head unit 13 is again sub-scanned by two heads, and the third drawing operation (forward path) is performed while moving the workpiece W in the X-axis direction again (to the back side in FIG. 1). In this way, by repeating the movement and drawing operation of the workpiece W while changing the corresponding functional liquid droplet ejection head 17 with respect to the position on the workpiece W by three main scans and two sub-scans, a predetermined value is obtained. In this drawing pattern, functional droplets of R, G and B colors are drawn in a matrix. Note that there are three types of drawing patterns composed of functional liquids of three colors as shown in FIG. 5, and in this embodiment, drawing is performed using the drawing pattern (bit update data) shown in FIG.

  Next, with reference to FIGS. 6 to 10, the selection and arrangement method of the functional liquid droplet ejection head 17 and the selection and arrangement method of the carriage unit 51 will be described in detail. FIG. 6 is a flowchart relating to the selection and arrangement operation of the functional liquid droplet ejection head 17. The selection of the functional liquid droplet ejection heads 17 is performed by selecting the functional liquid droplet ejection heads 17 for each color to be mounted on the carriage plate 53 from a number of manufactured candidate heads. In the following description, the description will be made ignoring the existence of the invalid discharge nozzles irrespective of drawing or measurement.

  As shown in FIG. 6, first, a large number of candidate heads are allocated for each color (S1). For example, when 300 candidate heads are manufactured, 100 candidate heads are assigned to each of RGB three colors. Thereafter, each candidate head is inspected for each color (S2).

  Each candidate head is inspected by an inspection device (not shown). By this inspection apparatus, a droplet discharge amount, a discharge speed, a discharge failure, and the like at each discharge nozzle 98 of each candidate head are detected. In particular, the droplet discharge amount of each discharge nozzle 98 is measured for each of the ten discharge nozzles 98 at both ends, and the remaining discharge nozzles 98 (a plurality of discharge nozzles 98 located in the intermediate portion) are measured at both ends. This is obtained using an approximate characteristic diagram (see FIG. 7) based on the measurement result of the discharge nozzle 98. The droplet discharge amount of the discharge nozzles 98 at both ends is measured by discharging 4 to 6 shots onto the water-repellent surface by the discharge nozzle 98 to form landing droplets, drying the landing droplets, and the white interferometer or the like. Is performed by measuring the volume of the landing droplet. As a method for measuring the droplet discharge amount, there may be a method of measuring the weight of the landing droplet with an electronic balance or the like, or an image recognition camera that faces the landing droplet from above or from the side (or above and from the side). The volume may be calculated and measured based on the image recognition result.

  In this way, by determining the droplet discharge amount of each discharge nozzle 98 of the nozzle array 99 from the approximate characteristic diagram based on the measurement results of several discharge nozzles 98, it is not necessary to measure all the discharge nozzles 98. The droplet discharge amount of all the discharge nozzles 98 can be acquired efficiently. Further, by creating an approximate characteristic diagram based on the measurement results of the discharge nozzles 98 at both ends, the influence on color unevenness is large, and the discharge nozzles 98 at both ends used for determining the arrangement of the functional liquid droplet discharge head 17. In contrast, the exact value can be obtained. The approximate characteristic diagram is preferably a sixth-order approximate curve, but is not limited thereto. Further, the discharge failure includes no discharge, flight bend, abnormal discharge and the like.

  In addition, the value of the droplet discharge amount acquired here uses a percentage of increase / decrease with respect to the reference value, where the reference value is 100% in order to facilitate subsequent comparison and calculation. For example, when the reference value is 1.05 pl and the droplet discharge amount is 1.0605 pl, 1.0605 = 1.05 + (1.05 × 0.01) = 1.05 + (1.05 × 1%) Therefore, it becomes + 1%. Further, when the droplet discharge amount is 1.0395 pl, 1.0395 = 1.05− (1.05 × 0.01) = 1.05− (1.05 × 1%), so that −1% Become.

  Next, the variation and intercept value of the droplet discharge amount are acquired from the detected droplet discharge amount of each discharge nozzle 98 (S3 and S4). The variation in the droplet discharge amount is the difference between the maximum value and the minimum value in the droplet discharge amount of all the discharge nozzles 98. The intercept value of the droplet discharge amount is a difference between the two discharge nozzles 98 located at both ends of the nozzle row 99 and the average value of the droplet discharge amounts of all the discharge nozzles 98. That is, two intercept values of the droplet discharge amount are acquired at the right end and the left end. Since the average value of the droplet discharge amounts of all the discharge nozzles 98 is the same value as the above reference value, the droplet discharge amounts of the discharge nozzles 98 located at both ends are directly used as the intercept values. The intercept value is acquired without adding an absolute value and adding plus and minus. Moreover, it is preferable to use the average value of the droplet discharge amounts of the ten discharge nozzles 98 at the corresponding end portions as the droplet discharge amount of the two discharge nozzles 98 from which the intercept value is acquired. As a result, variations in the droplet discharge amount of one discharge nozzle 98 can be reduced, and it is possible to accurately compare whether or not an intercept range condition described later is satisfied.

  When the variation in droplet discharge amount and the intercept values at both ends are acquired, S, A, and B are ranked in each candidate head and defective heads are excluded (S5). The ranking of each candidate head is performed based on whether or not the variation range condition and the intercept range condition are satisfied. The variation range condition is a condition that variation in droplet discharge amount is within the variation range set in each rank, and the intercept range condition is that the absolute value of each intercept value in droplet discharge amount is set in each rank. It is a condition that it is within the allowable range. The S rank is set such that the variation range is 2% or less and the allowable range of the intercept value is 0.65% or less. That is, the candidate heads whose variation is 2% or less and whose absolute value of each intercept value is 0.65% or less are set to S rank. The rank A is set to a variation range of 2.5% or less and the allowable range of the intercept value is 0.9% or less. The rank B is a variation range condition of 3% or less and the allowable range of the intercept value is ∞. % Or less (no limitation).

  Candidate heads that are not set in any of the ranks S, A, and B (that is, those that have a variation of more than 3%) and candidate heads in which ejection failure is detected in the above inspection are excluded as defective heads. For example, in 100 candidate heads assigned to the B color, it is determined that the S rank is 20, the A rank is 40, the B rank is 30, and the number of defective heads is 10. In such a case, 10 candidate heads are excluded as defective heads, and 90 candidate heads remain in a ranked state. The rank added by these is acquired as the droplet discharge amount characteristic of each candidate head.

  Next, based on the rank (droplet discharge amount characteristic), a plurality of functional droplet discharge heads 17 mounted on the carriage unit 51 are selected from the candidate heads (S6). The selection of the functional liquid droplet ejection heads 17 is performed according to the color-specific selection criteria set based on the correlation between the liquid droplet ejection amount characteristics (rank) of the candidate heads and the degree of color unevenness for each color. In other words, B color has a higher degree of color unevenness with respect to the droplet discharge amount characteristic than RG color. Therefore, B color has ranks S and A as usable ranks, and RG color has all ranks as usable ranks. To do. That is, in the B color, it is selected as the functional liquid droplet ejection head 17 mounted on the candidate head of rank S or A. At this time, candidate heads that do not satisfy the selection criteria (usable rank) are excluded. These candidate heads may be used as candidate heads of different colors. In addition, the correlation between the droplet discharge amount characteristic and the color unevenness occurrence degree for each color is based on the droplet discharge amount characteristic of the candidate head (functional droplet discharge head 17) and the visual per color in the finished product. A correlation obtained with a typical degree of color unevenness is experimentally used. That is, the correlation data uses different data depending on the finished product, and is not limited to the above selection criteria.

  As described above, the functional liquid droplet ejection head 17 used for ejecting each color functional liquid is selected according to the color-specific selection criteria set based on the correlation between the liquid droplet ejection amount characteristics and the degree of color unevenness for each color. By sorting, the functional liquid droplet ejection heads 17 can be sorted in consideration of the characteristics of each color functional liquid. For this reason, uniform recording image quality can be obtained, and the functional droplet ejection head 17 with high accuracy can be allocated to the functional liquid that is greatly influenced by the droplet ejection amount characteristic. A drawing result can be obtained. Further, the ratio of defective heads can be suppressed.

  In addition, by inspecting the droplet discharge amount characteristic using the droplet discharge amount of each discharge nozzle 98, the droplet discharge amount characteristic can be appropriately inspected. Further, by ranking based on whether or not the variation range condition and the intercept range condition are satisfied, and obtaining the rank as a droplet discharge amount characteristic, the droplets of the candidate head can be accurately and appropriately determined. The ejection amount characteristics can be acquired, and the candidate heads can be easily compared by ranking.

  Furthermore, B color functional liquid, which has a large influence on the droplet discharge amount characteristic, has a strict selection criterion for selecting the functional droplet discharge head 17 with good droplet discharge performance. Drawing results can be obtained.

  After selecting the functional liquid droplet ejection heads 17 for the respective colors, the functional liquid droplet ejection heads 17 are arranged and mounted on the carriage units 51 (S7). The carriage units 51 referred to here are not the ten carriage units 51 mounted on the apparatus but a large number of candidate carriage units that are to be sorted into the ten carriage units 51.

  Similar to the carriage unit 51, each candidate carriage unit is equipped with a total of twelve functional liquid droplet ejection heads 17 for each color. At this time, each functional liquid droplet ejection head 17 is arranged at a position where each color is determined (see FIG. 3), and is arranged and mounted on the candidate carriage unit with the same rank regardless of the color. For example, the upper rank functional droplet discharge heads 17 for each color are mounted on a common candidate carriage unit, and the lower rank function droplet discharge heads 17 for each color are mounted on a common candidate carriage unit. When each functional liquid droplet ejection head 17 is mounted on the candidate carriage unit, the ejection characteristic information (rank, variation, intercept value, etc.) of each functional liquid droplet ejection head 17 is packed as information on the mounted candidate carriage unit. Is done.

  Next, with reference to FIGS. 8 and 9, a method for selecting and arranging the ten carriage units 51 will be described. FIG. 8 is a flowchart relating to the selection and placement operation of the carriage unit 51. As shown in the figure, first, each candidate carriage unit is ranked (S11). Here, ranking is performed using the rank from the ejection characteristic information of each functional liquid droplet ejection head 17 packed in each candidate carriage unit. That is, the one with the lowest rank (S> A> B) of each mounted functional droplet discharge head 17 is set as the rank of each candidate carriage unit. As a result, the ranks S, A, and B are assigned to each candidate carriage unit.

  When the rank is given, ten carriage units 51 are selected from a large number of candidate carriage units based on the rank (12). Of all the candidate carriage units, the ten highest ranks are selected as the ten carriage units 51 mounted on the droplet discharge device 1. If the ranks of the carriage units 51 corresponding to the tenth and eleventh from the top of the rank are the same, the ranks are ranked in descending order using the variations and intercept values of the mounted functional liquid droplet ejection heads 17. And select the ones with high rank (high accuracy).

  Thereafter, the arrangement (arrangement order) of the ten selected carriage units 51 is determined. As shown in FIG. 9, first, two carriage units 51 having the lowest rank among the ten are set as both ends (S13). Next, the arrangement order (arrangement) of the remaining eight carriage units 51 excluding two at both ends is determined as follows. When the ten arrangement positions of the ten carriage units 51 are A1, A2,..., A10, respectively, in the entire arrangement order (arrangement pattern) in the eight carriage units 51, between A2 and A3, A3. The intercept value difference between the carriage units 51 in the seven adjacent portions between -A4, A4-A5, A5-A6, A6-A7, A7-A8, and A8-A9 is calculated.

  The intercept value difference between the adjacent portions is that the two head units 13 related to the adjacent portions are the left head unit and the right head unit, and the twelve functional liquid droplet ejection heads 17 mounted on each head unit 13 are 1, head 2,..., Head 12, a functional liquid droplet ejection head 17 (R color: head 10, G color: head 11, B: head 12) located at the right end of each color in the left head unit. It is obtained from the intercept value at the right end and the intercept value at the left end of the functional liquid droplet ejection head 17 (R color: head 1, G color: head 2, B: head 3) located at the left end in each color in the right head unit. That is, for each color, the difference between the two intercept values (intercept value difference) is obtained, and the largest one of the three intercept value differences of the three RGB colors is defined as the intercept value difference between the adjacent portions. For example, the right intercept values of head 10, head 11, and head 12 of the left head unit are (+ 0.52%), (+ 0.31%), (−0.64%), and the head of the right head unit 1, the intercept values on the left side of the head 2 and the head 3 are (+ 0.07%), (+ 0.55%). When (−0.33%), the intercept difference of each color is (R, G, B) = {(0.52−0.07%), (0.31−0.55%), (− 0.64-(− 0.33))} = (0.45%, 0.24%, 0.31%). Therefore, 0.45% of the R color, which is the maximum value among them, is the intercept value difference between the adjacent portions.

  Next, the smoothness of the droplet discharge amount between the carriage units 51 in each arrangement order is evaluated from the intercept value difference between the adjacent portions. The smoothness of the droplet discharge amount is the degree of the step of the droplet discharge amount between the head units 13, and the lower the maximum value of the intercept value difference between the seven adjacent portions, the higher the evaluation, and the seven adjacent portions The higher the maximum value in the intercept value difference of the part, the lower the evaluation. The combination having the highest evaluated smoothness in the total arrangement order is determined as the arrangement of the eight carriage units 51 located in the middle. That is, the arrangement of the carriage unit 51 at the intermediate position is determined by the combination having the lowest maximum value of the intercept value difference between the seven adjacent portions (S14). With these determined arrangements, ten carriage units 51 are mounted on the droplet discharge device 1 (Y-axis table 12) (S15). In this embodiment, the maximum value is obtained from the intercept value difference of each color in each adjacent portion, and the maximum value among the maximum values in each adjacent portion is used for evaluating the smoothness of the droplet discharge amount. On the contrary, as shown in FIG. 10, the maximum value in each adjacent portion is obtained for each color, and the maximum value among the three maximum values for each color is used for evaluating the smoothness of the droplet discharge amount. good.

  With the configuration as described above, functional liquid droplet ejection used to eject each color functional liquid according to the color-specific selection criteria set based on the correlation between the liquid droplet ejection amount characteristics and the degree of color unevenness by color By selecting the head 17, it is possible to select the functional liquid droplet ejection head 17 in consideration of the characteristics of each color functional liquid. For this reason, uniform recording image quality can be obtained, and the functional droplet ejection head 17 with high accuracy can be allocated to the functional liquid that is greatly influenced by the droplet ejection amount characteristic. A drawing result can be obtained. Further, the ratio of defective heads can be suppressed.

  And the yield of the workpiece | work W can be improved by using the several functional droplet discharge head 17 selected using the head selection method of the functional droplet discharge head 17 which can obtain a quality drawing result.

  In the present embodiment, as a head selection method for the functional liquid droplet ejection head 17, the inspected candidate heads are ranked according to a common criterion and excluded from defective heads, and then ranked according to a selection criterion for each color. However, if the method is to sort the functional liquid droplet ejection heads 17 according to the sorting criteria for each color, the tested candidate heads are classified into ranks and defective heads according to the criteria for each color (sorting criteria). You may make it exclude. In such a case, it is not necessary to perform the selection twice based on the defective head exclusion and the selection based on the rank, and the functional liquid droplet ejection heads 17 can be selected for each color by one selection based on the defective head exclusion.

  Further, in the present embodiment, the candidate heads are assigned to the respective colors in advance for reasons such as using a test solution for each color, and then the candidate heads assigned to the respective colors are inspected and selected for each color. The method was used. However, the present invention is not limited to this method, and a common inspection may be performed to select all candidate heads according to the selection criteria for each color. In such a case, since the candidate heads that are not selected for the B color can be used in the RG color, the yield of the candidate heads can be improved.

  Furthermore, in the present embodiment, the droplet discharge device 1 including ten carriage units 51 is used, but the number of carriage units 51 is arbitrary.

  Next, as an electro-optical device (flat panel display) manufactured using the droplet discharge device 1 of this embodiment, a color filter, a liquid crystal display device, an organic EL device, a plasma display (PDP device), an electron emission device ( FED devices, SED devices), and active matrix substrates formed in these display devices will be described as an example for their structures and manufacturing methods. Note that an active matrix substrate refers to a substrate on which a thin film transistor, a source line electrically connected to the thin film transistor, and a data line are formed.

  Next, as an electro-optical device (flat panel display) manufactured using the droplet discharge device 1 of this embodiment, a color filter, a liquid crystal display device, an organic EL device, a plasma display (PDP device), an electron emission device ( FED devices, SED devices), and active matrix substrates formed in these display devices will be described as an example for their structures and manufacturing methods. Note that an active matrix substrate refers to a substrate on which a thin film transistor, a source line electrically connected to the thin film transistor, and a data line are formed.

First, a method for manufacturing a color filter incorporated in a liquid crystal display device, an organic EL device, or the like will be described. FIG. 11 is a flowchart showing the manufacturing process of the color filter, and FIG. 12 is a schematic cross-sectional view of the color filter 500 (filter base body 500A) of this embodiment shown in the order of the manufacturing process.
First, in the black matrix forming step (S101), a black matrix 502 is formed on a substrate (W) 501 as shown in FIG. The black matrix 502 is formed of metal chromium, a laminate of metal chromium and chromium oxide, resin black, or the like. A sputtering method, a vapor deposition method, or the like can be used to form the black matrix 502 made of a metal thin film. Further, when forming the black matrix 502 made of a resin thin film, a gravure printing method, a photoresist method, a thermal transfer method, or the like can be used.

Subsequently, in the bank formation step (S102), a bank 503 is formed in a state of being superimposed on the black matrix 502. That is, first, as shown in FIG. 12B, a resist layer 504 made of a negative transparent photosensitive resin is formed so as to cover the substrate 501 and the black matrix 502. Then, an exposure process is performed with the upper surface covered with a mask film 505 formed in a matrix pattern shape.
Further, as shown in FIG. 12C, the resist layer 504 is patterned by etching an unexposed portion of the resist layer 504 to form a bank 503. When the black matrix is formed from resin black, it is possible to use both the black matrix and the bank.
The bank 503 and the black matrix 502 below the partition wall 507b partitioning each pixel region 507a, and in the subsequent colored layer forming step, the colored liquid layers (film forming portions) 508R, 508G, When forming 508B, the landing area of the functional droplet is defined.

The filter substrate 500A is obtained through the above black matrix forming step and bank forming step.
In the present embodiment, as the material for the bank 503, a resin material whose surface is lyophobic (hydrophobic) is used. Since the surface of the substrate (glass substrate) 501 is lyophilic (hydrophilic), the droplets into each pixel region 507a surrounded by the bank 503 (partition wall portion 507b) in the colored layer forming step described later. Variations in landing position can be automatically corrected.

  Next, in the colored layer forming step (S103), as shown in FIG. 12D, the functional liquid droplets are ejected by the functional liquid droplet ejection head 17, and each pixel region 507a surrounded by the partition wall portion 507b is disposed. Let it land. In this case, the functional liquid droplet ejection head 17 is used to introduce functional liquids (filter materials) of three colors of R, G, and B to eject functional liquid droplets. Note that the three-color arrangement pattern of R, G, and B includes a stripe arrangement, a mosaic arrangement, and a delta arrangement.

Thereafter, the functional liquid is fixed through a drying process (a process such as heating), and three colored layers 508R, 508G, and 508B are formed. When the colored layers 508R, 508G, and 508B are formed, the process proceeds to the protective film forming step (S104), and as shown in FIG. A protective film 509 is formed so as to cover the upper surface.
That is, after the protective film coating liquid is discharged over the entire surface of the substrate 501 where the colored layers 508R, 508G, and 508B are formed, the protective film 509 is formed through a drying process.
Then, after forming the protective film 509, the color filter 500 moves to a film forming process such as ITO (Indium Tin Oxide) which becomes a transparent electrode in the next process.

  FIG. 13 is a cross-sectional view of a principal part showing a schematic configuration of a passive matrix liquid crystal device (liquid crystal device) as an example of a liquid crystal display device using the color filter 500 described above. By attaching auxiliary elements such as a liquid crystal driving IC, a backlight, and a support to the liquid crystal device 520, a transmissive liquid crystal display device as a final product can be obtained. Since the color filter 500 is the same as that shown in FIG. 12, the corresponding parts are denoted by the same reference numerals, and the description thereof is omitted.

The liquid crystal device 520 is roughly configured by a color filter 500, a counter substrate 521 made of a glass substrate, and a liquid crystal layer 522 made of an STN (Super Twisted Nematic) liquid crystal composition sandwiched between them, The filter 500 is arranged on the upper side (observer side) in the figure.
Although not shown, polarizing plates are provided on the outer surfaces of the counter substrate 521 and the color filter 500 (surfaces opposite to the liquid crystal layer 522 side), and the polarizing plates located on the counter substrate 521 side are also provided. A backlight is disposed outside.

On the protective film 509 of the color filter 500 (on the liquid crystal layer side), a plurality of strip-shaped first electrodes 523 elongated in the left-right direction in FIG. 13 are formed at predetermined intervals. The color of the first electrode 523 A first alignment film 524 is formed so as to cover the surface opposite to the filter 500 side.
On the other hand, a plurality of strip-shaped second electrodes 526 elongated in a direction orthogonal to the first electrode 523 of the color filter 500 are formed on the surface of the counter substrate 521 facing the color filter 500 at a predetermined interval. A second alignment film 527 is formed so as to cover the surface of the two electrodes 526 on the liquid crystal layer 522 side. The first electrode 523 and the second electrode 526 are made of a transparent conductive material such as ITO.

The spacer 528 provided in the liquid crystal layer 522 is a member for keeping the thickness (cell gap) of the liquid crystal layer 522 constant. The sealing material 529 is a member for preventing the liquid crystal composition in the liquid crystal layer 522 from leaking to the outside. Note that one end of the first electrode 523 extends to the outside of the sealing material 529 as a lead-out wiring 523a.
A portion where the first electrode 523 and the second electrode 526 intersect with each other is a pixel, and the color layers 508R, 508G, and 508B of the color filter 500 are located in the portion that becomes the pixel.

  In a normal manufacturing process, patterning of the first electrode 523 and application of the first alignment film 524 are performed on the color filter 500 to create a portion on the color filter 500 side. Patterning of the electrode 526 and application of the second alignment film 527 are performed to create a portion on the counter substrate 521 side. Thereafter, a spacer 528 and a sealing material 529 are formed in the portion on the counter substrate 521 side, and the portion on the color filter 500 side is bonded in this state. Next, liquid crystal constituting the liquid crystal layer 522 is injected from the inlet of the sealing material 529, and the inlet is closed. Thereafter, both polarizing plates and the backlight are laminated.

  The droplet discharge device 1 according to the embodiment applies, for example, a spacer material (functional liquid) that constitutes the cell gap, and before the portion on the color filter 500 side is bonded to the portion on the counter substrate 521 side, the sealing material Liquid crystal (functional liquid) can be uniformly applied to the region surrounded by 529. Further, the printing of the sealing material 529 can be performed by the functional liquid droplet ejection head 17. Further, the first and second alignment films 524 and 527 can be applied by the functional liquid droplet ejection head 17.

FIG. 14 is a cross-sectional view of a principal part showing a schematic configuration of a second example of a liquid crystal device using the color filter 500 manufactured in the present embodiment.
The liquid crystal device 530 is significantly different from the liquid crystal device 520 in that the color filter 500 is arranged on the lower side (the side opposite to the observer side) in the figure.
The liquid crystal device 530 is generally configured by sandwiching a liquid crystal layer 532 made of STN liquid crystal between a color filter 500 and a counter substrate 531 made of a glass substrate or the like. Although not shown, polarizing plates and the like are provided on the outer surfaces of the counter substrate 531 and the color filter 500, respectively.

On the protective film 509 of the color filter 500 (on the liquid crystal layer 532 side), a plurality of strip-shaped first electrodes 533 elongated in the depth direction in the figure are formed at predetermined intervals, and the liquid crystal of the first electrodes 533 is formed. A first alignment film 534 is formed so as to cover the surface on the layer 532 side.
A plurality of strip-shaped second electrodes 536 extending in a direction orthogonal to the first electrode 533 on the color filter 500 side are formed on the surface of the counter substrate 531 facing the color filter 500 at a predetermined interval. A second alignment film 537 is formed so as to cover the surface of the second electrode 536 on the liquid crystal layer 532 side.

The liquid crystal layer 532 is provided with a spacer 538 for keeping the thickness of the liquid crystal layer 532 constant and a sealing material 539 for preventing the liquid crystal composition in the liquid crystal layer 532 from leaking to the outside. Yes.
Similarly to the liquid crystal device 520 described above, a portion where the first electrode 533 and the second electrode 536 intersect with each other is a pixel, and the colored layers 508R, 508G, and 508B of the color filter 500 are located at the portion that becomes the pixel. Is configured to do.

FIG. 15 shows a third example in which a liquid crystal device is configured using a color filter 500 to which the present invention is applied, and is an exploded perspective view showing a schematic configuration of a transmissive TFT (Thin Film Transistor) type liquid crystal device. It is.
In the liquid crystal device 550, the color filter 500 is arranged on the upper side (observer side) in the figure.

The liquid crystal device 550 includes a color filter 500, a counter substrate 551 disposed so as to face the color filter 500, a liquid crystal layer (not shown) sandwiched therebetween, and an upper surface side (observer side) of the color filter 500. The polarizing plate 555 and the polarizing plate (not shown) arranged on the lower surface side of the counter substrate 551 are roughly configured.
A liquid crystal driving electrode 556 is formed on the surface of the protective film 509 of the color filter 500 (the surface on the counter substrate 551 side). The electrode 556 is made of a transparent conductive material such as ITO, and is a full surface electrode that covers the entire region where a pixel electrode 560 described later is formed. An alignment film 557 is provided so as to cover the surface of the electrode 556 opposite to the pixel electrode 560.

  An insulating layer 558 is formed on the surface of the counter substrate 551 facing the color filter 500, and the scanning lines 561 and the signal lines 562 are formed on the insulating layer 558 in a state of being orthogonal to each other. A pixel electrode 560 is formed in a region surrounded by the scanning lines 561 and the signal lines 562. In an actual liquid crystal device, an alignment film is provided on the pixel electrode 560, but the illustration is omitted.

  In addition, a thin film transistor 563 including a source electrode, a drain electrode, a semiconductor, and a gate electrode is incorporated in a portion surrounded by the cutout portion of the pixel electrode 560 and the scanning line 561 and the signal line 562. . The thin film transistor 563 is turned on / off by application of signals to the scanning line 561 and the signal line 562 so that energization control to the pixel electrode 560 can be performed.

  Note that the liquid crystal devices 520, 530, and 550 in the above examples are transmissive, but a reflective liquid crystal device or a transflective liquid crystal device is provided by providing a reflective layer or a transflective layer. You can also

  Next, FIG. 16 is a cross-sectional view of a main part of a display region (hereinafter simply referred to as a display device 600) of the organic EL device.

The display device 600 is schematically configured with a circuit element portion 602, a light emitting element portion 603, and a cathode 604 laminated on a substrate (W) 601.
In the display device 600, light emitted from the light emitting element portion 603 to the substrate 601 side is transmitted through the circuit element portion 602 and the substrate 601 and emitted to the observer side, and the light emitting element portion 603 is opposite to the substrate 601. After the light emitted to the side is reflected by the cathode 604, the light passes through the circuit element portion 602 and the substrate 601 and is emitted to the observer side.

  A base protective film 606 made of a silicon oxide film is formed between the circuit element portion 602 and the substrate 601, and an island-shaped semiconductor film 607 made of polycrystalline silicon is formed on the base protective film 606 (on the light emitting element portion 603 side). Is formed. In the left and right regions of the semiconductor film 607, a source region 607a and a drain region 607b are formed by high concentration cation implantation, respectively. A central portion where no positive ions are implanted is a channel region 607c.

  In the circuit element portion 602, a transparent gate insulating film 608 covering the base protective film 606 and the semiconductor film 607 is formed, and a position corresponding to the channel region 607c of the semiconductor film 607 on the gate insulating film 608 is formed. For example, a gate electrode 609 made of Al, Mo, Ta, Ti, W or the like is formed. On the gate electrode 609 and the gate insulating film 608, a transparent first interlayer insulating film 611a and a second interlayer insulating film 611b are formed. Further, contact holes 612a and 612b are formed through the first and second interlayer insulating films 611a and 611b and communicating with the source region 607a and the drain region 607b of the semiconductor film 607, respectively.

A transparent pixel electrode 613 made of ITO or the like is patterned and formed in a predetermined shape on the second interlayer insulating film 611b, and the pixel electrode 613 is connected to the source region 607a through the contact hole 612a. .
A power supply line 614 is disposed on the first interlayer insulating film 611a, and the power supply line 614 is connected to the drain region 607b through the contact hole 612b.

  Thus, the driving thin film transistors 615 connected to the pixel electrodes 613 are formed in the circuit element portion 602, respectively.

The light emitting element portion 603 includes a functional layer 617 stacked on each of the plurality of pixel electrodes 613, and a bank portion 618 provided between each pixel electrode 613 and the functional layer 617 to partition each functional layer 617. It is roughly structured.
The pixel electrode 613, the functional layer 617, and the cathode 604 provided on the functional layer 617 constitute a light emitting element. Note that the pixel electrode 613 is formed by patterning in a substantially rectangular shape in plan view, and a bank portion 618 is formed between the pixel electrodes 613.

The bank unit 618 is laminated on the inorganic bank layer 618a (first bank layer) 618a formed of an inorganic material such as SiO, SiO ₂ , TiO _{2, and the} like, and is made of an acrylic resin, a polyimide resin, or the like. It is composed of an organic bank layer 618b (second bank layer) having a trapezoidal cross section formed of a resist having excellent heat resistance and solvent resistance. A part of the bank unit 618 is formed on the peripheral edge of the pixel electrode 613.
An opening 619 that gradually expands upward with respect to the pixel electrode 613 is formed between the bank portions 618.

The functional layer 617 includes a hole injection / transport layer 617a formed in a stacked state on the pixel electrode 613 in the opening 619, and a light emitting layer 617b formed on the hole injection / transport layer 617a. Has been. Note that another functional layer having other functions may be further formed adjacent to the light emitting layer 617b. For example, it is possible to form an electron transport layer.
The hole injection / transport layer 617a has a function of transporting holes from the pixel electrode 613 side and injecting them into the light emitting layer 617b. The hole injection / transport layer 617a is formed by discharging a first composition (functional liquid) containing a hole injection / transport layer forming material. A known material is used as the hole injection / transport layer forming material.

  The light emitting layer 617b emits light in red (R), green (G), or blue (B), and discharges a second composition (functional liquid) containing a light emitting layer forming material (light emitting material). Is formed. As the solvent (nonpolar solvent) of the second composition, a known material that is insoluble in the hole injection / transport layer 617a is preferably used, and such a nonpolar solvent is used as the second composition of the light emitting layer 617b. By using the light emitting layer 617b, the light emitting layer 617b can be formed without re-dissolving the hole injection / transport layer 617a.

  The light emitting layer 617b is configured such that the holes injected from the hole injection / transport layer 617a and the electrons injected from the cathode 604 are recombined in the light emitting layer to emit light.

  The cathode 604 is formed so as to cover the entire surface of the light emitting element portion 603, and plays a role of flowing current to the functional layer 617 in a pair with the pixel electrode 613. Note that a sealing member (not shown) is disposed on the cathode 604.

Next, a manufacturing process of the display device 600 will be described with reference to FIGS.
As shown in FIG. 17, the display device 600 includes a bank part forming step (S111), a surface treatment step (S112), a hole injection / transport layer forming step (S113), a light emitting layer forming step (S114), It is manufactured through an electrode forming step (S115). In addition, a manufacturing process is not restricted to what is illustrated, and when other processes are removed as needed, it may be added.

First, in the bank part forming step (S111), as shown in FIG. 18, an inorganic bank layer 618a is formed on the second interlayer insulating film 611b. The inorganic bank layer 618a is formed by forming an inorganic film at a formation position and then patterning the inorganic film using a photolithography technique or the like. At this time, a part of the inorganic bank layer 618 a is formed so as to overlap with the peripheral edge of the pixel electrode 613.
When the inorganic bank layer 618a is formed, an organic bank layer 618b is formed on the inorganic bank layer 618a as shown in FIG. The organic bank layer 618b is also formed by patterning using a photolithography technique or the like in the same manner as the inorganic bank layer 618a.
In this way, the bank portion 618 is formed. Accordingly, an opening 619 opening upward with respect to the pixel electrode 613 is formed between the bank portions 618. The opening 619 defines a pixel region.

In the surface treatment step (S112), a lyophilic process and a lyophobic process are performed. The regions to be subjected to lyophilic treatment are the first stacked portion 618aa of the inorganic bank layer 618a and the electrode surface 613a of the pixel electrode 613. These regions are made lyophilic by plasma treatment using oxygen as a treatment gas, for example. Is done. This plasma treatment also serves to clean the ITO that is the pixel electrode 613.
In addition, the lyophobic treatment is performed on the wall surface 618s of the organic bank layer 618b and the upper surface 618t of the organic bank layer 618b. )
By performing this surface treatment process, when forming the functional layer 617 using the functional liquid droplet ejection head 17, the functional liquid droplets can be landed more reliably on the pixel area. It is possible to prevent the functional droplets from overflowing from the opening 619.

  Then, the display device base 600A is obtained through the above steps. The display device base 600A is placed on the set table 21 of the droplet discharge device 1 shown in FIG. 1, and the following hole injection / transport layer forming step (S113) and light emitting layer forming step (S114) are performed. .

  As shown in FIG. 20, in the hole injection / transport layer forming step (S113), the first composition containing the hole injection / transport layer forming material is transferred from the functional liquid droplet ejection head 17 to each opening 619 that is a pixel region. Discharge inside. Thereafter, as shown in FIG. 21, a drying process and a heat treatment are performed to evaporate the polar solvent contained in the first composition, thereby forming a hole injection / transport layer 617a on the pixel electrode (electrode surface 613a) 613.

Next, the light emitting layer forming step (S114) will be described. In this light emitting layer forming step, as described above, in order to prevent re-dissolution of the hole injection / transport layer 617a, the hole injection / transport layer 617a is used as a solvent for the second composition used in forming the light emitting layer. A non-polar solvent insoluble in.
However, since the hole injection / transport layer 617a has a low affinity for the nonpolar solvent, the hole injection / transport layer 617a has a low affinity even if the second composition containing the nonpolar solvent is discharged onto the hole injection / transport layer 617a. There is a possibility that the injection / transport layer 617a and the light emitting layer 617b cannot be adhered to each other, or the light emitting layer 617b cannot be applied uniformly.
Therefore, in order to increase the surface affinity of the hole injection / transport layer 617a with respect to the nonpolar solvent and the light emitting layer forming material, it is preferable to perform surface treatment (surface modification treatment) before forming the light emitting layer. In this surface treatment, a surface modifying material which is the same solvent as the non-polar solvent of the second composition used in the formation of the light emitting layer or a similar solvent is applied on the hole injection / transport layer 617a, and this is applied. This is done by drying.
By performing such treatment, the surface of the hole injection / transport layer 617a is easily adapted to the nonpolar solvent. In the subsequent step, the second composition containing the light emitting layer forming material is added to the hole injection / transport layer. It can be uniformly applied to 617a.

  Then, as shown in FIG. 22, the second composition containing the light emitting layer forming material corresponding to one of the colors (blue (B) in the example of FIG. 22) is used as a functional droplet as a pixel region ( A predetermined amount is driven into the opening 619). The second composition driven into the pixel region spreads on the hole injection / transport layer 617a and fills the opening 619. Even if the second composition deviates from the pixel region and lands on the upper surface 618t of the bank portion 618, the upper composition 618t is subjected to the liquid repellent treatment as described above. Things are easy to roll into the opening 619.

  Thereafter, by performing a drying process or the like, the second composition after discharge is dried, the nonpolar solvent contained in the second composition is evaporated, and as shown in FIG. 23, a hole injection / transport layer 617a is obtained. A light emitting layer 617b is formed thereon. In this figure, a light emitting layer 617b corresponding to blue (B) is formed.

  Similarly, using the functional liquid droplet ejection head 17, as shown in FIG. 24, the same steps as in the case of the light emitting layer 617b corresponding to the blue (B) described above are sequentially performed, and other colors (red (R) and red (R) and A light emitting layer 617b corresponding to green (G) is formed. Note that the order in which the light-emitting layers 617b are formed is not limited to the illustrated order, and may be formed in any order. For example, the order of formation can be determined according to the light emitting layer forming material. In addition, the arrangement pattern of the three colors R, G, and B includes a stripe arrangement, a mosaic arrangement, a delta arrangement, and the like.

  As described above, the functional layer 617, that is, the hole injection / transport layer 617a and the light emitting layer 617b are formed on the pixel electrode 613. And it transfers to a counter electrode formation process (S115).

In the counter electrode forming step (S115), as shown in FIG. 25, a cathode 604 (counter electrode) is formed on the entire surface of the light emitting layer 617b and the organic bank layer 618b by, for example, vapor deposition, sputtering, CVD, or the like. In the present embodiment, the cathode 604 is configured by, for example, laminating a calcium layer and an aluminum layer.
At the top of the cathode 604, Al film as the electrode, Ag film and a protective layer of SiO _2, SiN, or the like for its antioxidant is appropriately provided.

  After forming the cathode 604 in this way, the display device 600 is obtained by performing other processes such as a sealing process for sealing the upper part of the cathode 604 with a sealing member and a wiring process.

Next, FIG. 26 is an exploded perspective view of a main part of a plasma display device (PDP device: hereinafter simply referred to as a display device 700). In the figure, the display device 700 is shown with a part thereof cut away.
The display device 700 is schematically configured to include a first substrate 701, a second substrate 702, and a discharge display portion 703 formed between them, which are disposed to face each other. The discharge display unit 703 includes a plurality of discharge chambers 705. Among the plurality of discharge chambers 705, the three discharge chambers 705 of the red discharge chamber 705R, the green discharge chamber 705G, and the blue discharge chamber 705B are arranged to form one pixel.

Address electrodes 706 are formed in stripes at predetermined intervals on the upper surface of the first substrate 701, and a dielectric layer 707 is formed so as to cover the address electrodes 706 and the upper surface of the first substrate 701. On the dielectric layer 707, partition walls 708 are provided so as to be positioned between the address electrodes 706 and along the address electrodes 706. The partition 708 includes one extending on both sides in the width direction of the address electrode 706 as shown, and one not shown extending in the direction orthogonal to the address electrode 706.
A region partitioned by the partition 708 is a discharge chamber 705.

  A phosphor 709 is disposed in the discharge chamber 705. The phosphor 709 emits red (R), green (G), or blue (B) fluorescence, and the red phosphor 709R is disposed at the bottom of the red discharge chamber 705R, and the green discharge chamber 705G. A green phosphor 709G and a blue phosphor 709B are arranged at the bottom and the blue discharge chamber 705B, respectively.

On the lower surface of the second substrate 702 in the drawing, a plurality of display electrodes 711 are formed in stripes at predetermined intervals in a direction orthogonal to the address electrodes 706. A dielectric layer 712 and a protective film 713 made of MgO or the like are formed so as to cover them.
The first substrate 701 and the second substrate 702 are bonded so that the address electrodes 706 and the display electrodes 711 face each other in a state of being orthogonal to each other. The address electrode 706 and the display electrode 711 are connected to an AC power source (not shown).
When the electrodes 706 and 711 are energized, the phosphor 709 emits light in the discharge display portion 703, and color display is possible.

In the present embodiment, the address electrode 706, the display electrode 711, and the phosphor 709 can be formed by using the droplet discharge device 1 shown in FIG. Hereinafter, a process of forming the address electrode 706 on the first substrate 701 will be exemplified.
In this case, the following steps are performed with the first substrate 701 placed on the set table 21 of the droplet discharge device 1.
First, a liquid material (functional liquid) containing a conductive film wiring forming material is landed on the address electrode formation region as a functional liquid droplet by the functional liquid droplet ejection head 17. This liquid material is obtained by dispersing conductive fine particles such as metal in a dispersion medium as a conductive film wiring forming material. As the conductive fine particles, metal fine particles containing gold, silver, copper, palladium, nickel, or the like, a conductive polymer, or the like is used.

  When the replenishment of the liquid material is completed for all the address electrode formation regions to be replenished, the address material 706 is formed by drying the discharged liquid material and evaporating the dispersion medium contained in the liquid material. .

By the way, although the formation of the address electrode 706 has been exemplified in the above, the display electrode 711 and the phosphor 709 can also be formed through the above steps.
In the case of forming the display electrode 711, as in the case of the address electrode 706, a liquid material (functional liquid) containing a conductive film wiring forming material is landed on the display electrode formation region as a functional droplet.
Further, in the case of forming the phosphor 709, a liquid material (functional liquid) containing a fluorescent material corresponding to each color (R, G, B) is ejected as droplets from the functional liquid droplet ejection head 17, and it corresponds. Land in the color discharge chamber 705.

Next, FIG. 27 is a cross-sectional view of an essential part of an electron emission device (also referred to as an FED device or an SED device: hereinafter simply referred to as a display device 800). In the drawing, a part of the display device 800 is shown as a cross section.
The display device 800 is schematically configured to include a first substrate 801, a second substrate 802, and a field emission display portion 803 formed therebetween, which are disposed to face each other. The field emission display unit 803 includes a plurality of electron emission units 805 arranged in a matrix.

  A first element electrode 806a and a second element electrode 806b constituting the cathode electrode 806 are formed on the upper surface of the first substrate 801 so as to be orthogonal to each other. In addition, a conductive film 807 having a gap 808 is formed in a portion partitioned by the first element electrode 806a and the second element electrode 806b. That is, the first element electrode 806a, the second element electrode 806b, and the conductive film 807 constitute a plurality of electron emission portions 805. The conductive film 807 is made of, for example, palladium oxide (PdO), and the gap 808 is formed by forming after forming the conductive film 807.

  An anode electrode 809 that faces the cathode electrode 806 is formed on the lower surface of the second substrate 802. A grid-like bank portion 811 is formed on the lower surface of the anode electrode 809, and a phosphor 813 is disposed in each downward opening 812 surrounded by the bank portion 811 so as to correspond to the electron emission portion 805. Yes. The phosphor 813 emits fluorescence of any one of red (R), green (G), and blue (B), and each opening 812 has a red phosphor 813R, a green phosphor 813G, and a blue color. The phosphors 813B are arranged in the predetermined pattern described above.

  The first substrate 801 and the second substrate 802 configured as described above are bonded together with a minute gap. In this display device 800, electrons that jump out of the first element electrode 806 a or the second element electrode 806 b that are cathodes through the conductive film (gap 808) 807 are formed on the phosphor 813 that is formed on the anode electrode 809 that is an anode. When excited, it emits light and enables color display.

  Also in this case, as in the other embodiments, the first element electrode 806a, the second element electrode 806b, the conductive film 807, and the anode electrode 809 can be formed using the droplet discharge device 1 and each color. The phosphors 813R, 813G, and 813B can be formed using the droplet discharge device 1.

  The first element electrode 806a, the second element electrode 806b, and the conductive film 807 have the planar shape shown in FIG. 28A, and when these are formed, as shown in FIG. In addition, the bank portion BB is formed (photolithographic method), leaving portions where the first element electrode 806a, the second element electrode 806b, and the conductive film 807 are previously formed. Next, the first element electrode 806a and the second element electrode 806b were formed in the groove portion constituted by the bank portion BB (inkjet method using the droplet discharge device 1), and the solvent was dried to form a film. After that, a conductive film 807 is formed (an ink jet method using the droplet discharge device 1). Then, after forming the conductive film 807, the bank portion BB is removed (ashing peeling process), and the process proceeds to the above forming process. As in the case of the organic EL device described above, it is preferable to perform a lyophilic process on the first substrate 801 and the second substrate 802 and a lyophobic process on the bank portions 811 and BB.

  As other electro-optical devices, devices such as metal wiring formation, lens formation, resist formation, and light diffuser formation are conceivable. By using the droplet discharge device 1 described above for manufacturing various electro-optical devices (devices), various electro-optical devices can be efficiently manufactured.

It is a top view of the droplet discharge device concerning an embodiment. It is a side view of a droplet discharge device. FIG. 4 is a diagram illustrating an arrangement configuration of functional droplet discharge heads mounted on a head unit. It is an external appearance perspective view of a functional droplet discharge head. It is explanatory drawing of the color arrangement pattern of a color filter, (a) is a stripe arrangement | sequence, (b) is a mosaic arrangement | sequence, (c) has shown the delta arrangement | sequence. 5 is a flowchart showing the operation of selecting and arranging functional droplet discharge heads. It is the figure which showed the approximate characteristic diagram. 5 is a flowchart showing a carriage unit selection and placement operation. It is explanatory drawing shown about the arrangement | positioning operation | movement of a carriage unit. It is the figure which showed the example of calculation of the combination in the carriage unit of an intermediate position. It is a flowchart explaining a color filter manufacturing process. (A)-(e) is a schematic cross section of the color filter shown to the manufacturing process order. It is principal part sectional drawing which shows schematic structure of the liquid crystal device using the color filter to which this invention is applied. It is principal part sectional drawing which shows schematic structure of the liquid crystal device of the 2nd example using the color filter to which this invention is applied. It is principal part sectional drawing which shows schematic structure of the liquid crystal device of the 3rd example using the color filter to which this invention is applied. It is principal part sectional drawing of the display apparatus which is an organic electroluminescent apparatus. It is a flowchart explaining the manufacturing process of the display apparatus which is an organic electroluminescent apparatus. It is process drawing explaining formation of an inorganic bank layer. It is process drawing explaining formation of an organic substance bank layer. It is process drawing explaining the process in which a positive hole injection / transport layer is formed. It is process drawing explaining the state in which the positive hole injection / transport layer was formed. It is process drawing explaining the process in which a blue light emitting layer is formed. It is process drawing explaining the state in which the blue light emitting layer was formed. It is process drawing explaining the state in which the light emitting layer of each color was formed. It is process drawing explaining formation of a cathode. It is a principal part disassembled perspective view of the display apparatus which is a plasma type display apparatus (PDP apparatus). It is principal part sectional drawing of the display apparatus which is an electron emission apparatus (FED apparatus). It is the top view (a) around the electron emission part of a display apparatus, and the top view (b) which shows the formation method.

Explanation of symbols

  1: droplet discharge device, 11: X axis table, 12: Y axis table, 13: head unit, 17: functional droplet discharge head, 53: carriage plate, 98: discharge nozzle, 99: nozzle row, W: work

Claims (11)

A functional liquid droplet ejection head for selecting a plurality of functional liquid droplet ejection heads from a large number of candidate heads as mounting candidates in order to eliminate color unevenness when mounting a plurality of ink jet type functional liquid droplet ejection heads on a carriage. The head sorting method of
A characteristic inspection step for inspecting a droplet discharge amount characteristic in the multiple candidate heads;
Droplet discharge amount characteristics of each candidate head inspected according to a color-specific selection criterion set based on the correlation between the droplet discharge amount characteristics of the candidate head and the color unevenness occurrence degree of each functional liquid color And a head selecting step for selecting the plurality of functional droplet discharge heads based on the above. In the characteristic inspection step, a discharge amount detection step of detecting a droplet discharge amount of each discharge nozzle in a nozzle row of the candidate head in the multiple candidate heads;
The characteristic droplet discharge head according to claim 1, further comprising: a characteristic acquisition step of acquiring a droplet discharge amount characteristic of the candidate head from the detected droplet discharge amount of each discharge nozzle. Head sorting method.   The method of claim 2, wherein in the discharge amount inspection step, the droplet discharge amount of each discharge nozzle is obtained from an approximate characteristic diagram based on a measurement result.   In the discharge amount inspection step, the approximate characteristic diagram is derived from a result obtained by measuring all of the two or more discharge nozzles at both ends of the nozzle row and decimating each discharge nozzle at the remaining intermediate portion. The method of selecting a head for a functional liquid droplet ejection head according to claim 3. In the characteristic acquisition step, in the multiple candidate heads,
Variation range condition in which variation in droplet discharge amount of each discharge nozzle is within a predetermined variation range;
An intercept range condition in which the difference between the average value of the droplet discharge amount of each discharge nozzle and the two droplet discharge amounts of the two discharge nozzles located at both ends of the nozzle row is within a predetermined allowable range; Rank based on whether or not
5. The head sorting method for a functional liquid droplet ejection head according to claim 2, wherein the rank is acquired as the liquid droplet ejection amount characteristic.   The two droplet discharge amounts to be compared as to whether or not the intercept range condition is satisfied are the average values of the droplet discharge amounts at two or more discharge nozzles located at corresponding ends of the nozzle row. 6. The method of selecting a head for a functional liquid droplet ejection head according to claim 5, wherein the head is selected. The functional liquid is an R / G / B3 color functional liquid,
7. The B color has a selection criterion for selecting a functional droplet discharge head having a better droplet discharge amount characteristic than the R color and the G color. A method for selecting a head of a functional liquid droplet ejection head. The plurality of functional liquid droplet ejection heads selected by the functional liquid droplet ejection head head sorting method according to claim 1,
A head unit comprising: a carriage on which the plurality of functional liquid droplet ejection heads are mounted. A plurality of head units according to claim 8 are provided,
An apparatus for discharging liquid droplets, comprising: an XY movement mechanism for moving a workpiece relative to the plurality of head units in the X-axis direction and the Y-axis direction.   10. A method for manufacturing an electro-optical device, wherein the droplet discharge device according to claim 9 is used to form a film forming portion with functional droplets on the workpiece.   An electro-optical device using the droplet discharge device according to claim 9, wherein a film forming portion using functional droplets is formed on the workpiece.

Images