JP2010204409A - Liquid drop discharge device, liquid drop discharge method, and method of manufacturing color filter - Google Patents

Liquid drop discharge device, liquid drop discharge method, and method of manufacturing color filter Download PDF

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Publication number
JP2010204409A
JP2010204409A JP2009050317A JP2009050317A JP2010204409A JP 2010204409 A JP2010204409 A JP 2010204409A JP 2009050317 A JP2009050317 A JP 2009050317A JP 2009050317 A JP2009050317 A JP 2009050317A JP 2010204409 A JP2010204409 A JP 2010204409A
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plurality
nozzles
ink
landing
sheet member
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JP2009050317A
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Japanese (ja)
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Takashi Goto
Takeshi Kato
Sadaji Komori
剛 加藤
貞治 小森
任 後藤
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Seiko Epson Corp
セイコーエプソン株式会社
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Abstract

Disclosed are a droplet discharge device, a droplet discharge method, and a method for manufacturing a color filter, which are capable of suppressing deterioration in image quality by making stripes inconspicuous and having excellent production efficiency.
A droplet discharge head having a plurality of nozzles for discharging a functional liquid and a plurality of driving elements provided corresponding to the plurality of nozzles, and landing of the functional liquid discharged from the plurality of nozzles. A plurality of supply reels 12 for supplying the sheet member 15 to be wound, a take-up reel 13 for taking up the sheet member 15 supplied from the supply reel 12, and a plurality of sheet members 15 between the supply reel 12 and the take-up reel 13. An imaging device 14 that captures an image of the functional fluid discharged from the nozzles of the nozzles, analysis means 32 that obtains the distribution of the discharge weights of the plurality of nozzles based on the correction data, and the discharge weights of the plurality of nozzles from the distribution are predetermined appropriate And control means 31 for adjusting the voltage applied to the plurality of drive elements so as to approach the weight.
[Selection] Figure 1

Description

  The present invention relates to a droplet discharge device, a droplet discharge method, and a color filter manufacturing method.

  2. Description of the Related Art In recent years, electro-optical devices such as liquid crystal devices and organic EL (Electro-Luminescent) devices have been used for display units of electronic devices such as mobile phones and portable computers. These electro-optical devices generally perform full color display. For example, full color display by a liquid crystal device is displayed by passing light modulated by a liquid crystal layer through a color filter. Such a color filter is formed by ejecting ink on the surface of a substrate in a dot shape by a film forming technique using a droplet discharge method.

  By the way, in the film forming technique using the droplet discharge method, the ink discharge amounts of the plurality of nozzles vary slightly. When the ink is drawn with variations in the ink discharge amount, streaky shading unevenness (straight unevenness) may occur in the color filter. Such uneven stripes are easily visible, and the image quality displayed through the color filter may be degraded.

  A technique for solving such a problem has been studied. For example, in Patent Document 1, a medium to be colored is colored with a plurality of different ink discharge densities, and the color density of the colored portion is measured to obtain a plurality of colors. The relationship between the color density of each colored portion colored with a different ink discharge density and the corresponding ink discharge density is calculated. Based on this relationship, a reduction in the image quality of the display image is suppressed by correcting the ink discharge density to obtain a desired color density.

JP-A-10-260306

  In Patent Document 1, the color density of each colored portion colored with different ink discharge densities is represented by the absorbance of the colored portion of the medium to be colored. If an error occurs during the measurement of the absorbance, correction with high accuracy cannot be performed, and it may be difficult to suppress deterioration in image quality.

  On the other hand, a method of measuring the weight of ink ejected from a plurality of nozzles is conventionally used. However, measuring the weight of the ink is not preferable in terms of mass production because it is not easy to measure and requires a large number of man-hours, and is inferior in production efficiency.

  The present invention has been made in view of such circumstances, and it is possible to suppress deterioration in image quality by making stripes inconspicuous, and further, a droplet discharge device, a droplet discharge method, and It is an object to provide a method for producing a color filter.

In order to solve the above problems, a droplet discharge apparatus according to the present invention includes a plurality of nozzles that discharge a functional liquid and a plurality of drive elements that are provided corresponding to the plurality of nozzles. A supply reel that supplies a sheet member for landing the functional liquid ejected from the plurality of nozzles, a take-up reel that winds up the sheet member supplied from the supply reel, and the supply reel and the take-up reel An imaging device that captures an image of the functional liquid ejected from the plurality of nozzles with respect to the sheet member between the reel, and an image processing of the image captured by the imaging device to perform the processing of the functional fluid The landing area on the sheet member is detected, and the plurality of nozzles are applied to the plurality of nozzles based on correction data that defines the relationship between the landing area and the discharge weight of the functional liquid discharged from the plurality of nozzles. Analyzing means for obtaining a distribution of the discharge weight, and a control means for adjusting a voltage applied to the plurality of drive elements so that the discharge weight of the plurality of nozzles approaches a predetermined appropriate weight from the distribution. It is characterized by that.
According to this configuration, an image on which ink (functional liquid) ejected from a plurality of nozzles is landed is captured by the imaging device. Then, the distribution of the discharge weight (ink weight) of the ink discharged from the plurality of nozzles is obtained by the analyzing means. Then, the voltage applied to the drive element is adjusted by the control means so that the ink weight in the plurality of nozzles approaches a predetermined appropriate weight. Thereby, the variation of the ink discharge amount in the plurality of nozzles is adjusted. That is, the variation in the ink discharge amount at the plurality of nozzles is corrected by the control means. This is because the inventor of the present application has found a certain relationship between the ink landing area and the ink weight in a plurality of nozzles. For this reason, a uniform amount of ink can be ejected from all nozzles of the droplet ejection head. Accordingly, it is possible to suppress the deterioration of the image quality by making the stripes inconspicuous. In addition, the method of measuring the ejection amount based on the correction data that defines the relationship between the landing area of the ink ejected from a plurality of nozzles and the ink weight is compared with the conventional method of measuring the weight of the ejected ink. Because it does not take enormous man-hours, it is excellent in production efficiency. In addition, since the sheet member on which the ink ejected from the plurality of nozzles has landed is appropriately conveyed, the landing area can be measured efficiently.

The droplet discharge method of the present invention is a droplet discharge method using a droplet discharge head having a plurality of nozzles for discharging a functional liquid and a plurality of drive elements provided corresponding to the plurality of nozzles. A first landing step of landing the functional liquid on the sheet member with a constant voltage applied to the plurality of drive elements, and the functional liquid landed on the sheet member after the first landing step. A first landing area is detected, and the distribution of the discharge weights at the plurality of nozzles is determined based on correction data that defines a relationship between the first landing area and the discharge weight of the functional liquid discharged from the plurality of nozzles. A first analysis step to be obtained, and a voltage applied to the plurality of driving elements is adjusted so that the discharge weight of the plurality of nozzles approaches a predetermined appropriate weight from the distribution, and the functional liquid is landed on the sheet member And having a second landing step.
According to this manufacturing method, the ink weight distribution in the plurality of nozzles is obtained by the first analysis step after the first landing step. Then, the ink weight at the plurality of nozzles is adjusted to approach a predetermined appropriate weight by the second landing process. As a result, the variation in the ink discharge amount among the plurality of nozzles is corrected. For this reason, a uniform amount of ink can be ejected from all nozzles of the droplet ejection head. Accordingly, it is possible to suppress the deterioration of the image quality by making the stripes inconspicuous.

In the droplet discharge method, the second landing area of the functional liquid landed on the sheet member is detected, the second landing area and the discharge weight of the functional liquid discharged from the plurality of nozzles, A second analysis step of obtaining a distribution of the discharge weights of the plurality of nozzles based on correction data defining the relationship of the plurality of nozzles, and the plurality of discharge weights so that the discharge weight of the plurality of nozzles approaches a predetermined appropriate weight from the distribution. It is desirable to have at least one third landing step of adjusting the voltage applied to the driving element and landing the functional liquid on the sheet member.
According to this manufacturing method, after the second landing process, the analysis process and the landing process are repeatedly performed a plurality of times, so that variations in the ink discharge amounts of the plurality of nozzles are reliably adjusted. For this reason, it becomes possible to discharge a substantially uniform amount of ink from all the nozzles of the droplet discharge head. Therefore, it is possible to make the unevenness more inconspicuous and to suppress the deterioration of the image quality.

The method for producing a color filter of the present invention is characterized in that the functional liquid is disposed in a predetermined region provided on a base material to form a color filter using the droplet discharge method described above.
According to this manufacturing method, as described above, a uniform amount of ink is ejected from all the nozzles of the droplet ejection head, so that a high-quality color filter free from unevenness can be produced.

It is a schematic diagram which shows schematic structure of the droplet discharge apparatus of this invention. It is a schematic diagram which shows schematic structure of a droplet discharge head. It is explanatory drawing of the method of forming a color filter on a color filter board | substrate. It is a figure which shows the discharge characteristic of the droplet discharge head before correction | amendment of the dispersion | variation in ink discharge amount. It is a flowchart which shows the process of a droplet discharge method. It is a figure which shows the state which has arrange | positioned two types of ink from which weight differs in a sheet | seat member. FIG. 6 is a relationship diagram between a change amount of a landing area and a change amount of a landing volume with respect to ink weight. It is a figure which shows the discharge characteristic of the droplet discharge head before and after dispersion | variation correction | amendment of an ink discharge amount.

  Embodiments of the present invention will be described below with reference to the drawings. This embodiment shows one aspect of the present invention, and does not limit the present invention, and can be arbitrarily changed within the scope of the technical idea of the present invention. Moreover, in the following drawings, in order to make each structure easy to understand, an actual structure and a scale, a number, and the like in each structure are different.

  In the following description, the XYZ rectangular coordinate system shown in FIG. 1 is set, and each member will be described with reference to this XYZ rectangular coordinate system. In the XYZ orthogonal coordinate system, the X axis and the Y axis are set in a direction parallel to the work stage 16, and the Z axis is set in a direction orthogonal to the work stage 16. In the XYZ coordinate system in FIG. 1, the XY plane is actually set to a plane parallel to the horizontal plane, and the Z axis is set to the vertically upward direction.

(Droplet discharge device)
FIG. 1 is a schematic diagram showing a schematic configuration of a droplet discharge device 1 according to the present invention. The droplet discharge device 1 is a device that forms a color filter layer by discharging droplets of a color filter material (functional liquid) onto a predetermined region of a color filter substrate (base material) P by, for example, an inkjet method. The droplet discharge device 1 also performs the droplet discharge method of the present invention.

  The droplet discharge device 1 includes a work stage 16, a droplet discharge head 5, a tube 44, a tank 33, a sheet member transport table 11, a supply reel 12, a take-up reel 13, an area measurement camera (imaging device) 14, and a control unit. (Control means) 31, analysis unit (analysis means) 32, first wiring 41, second wiring 42, and third wiring 43 are provided.

  The work stage 16 is installed so as to be movable in the X-axis direction by a stage moving device (not shown). The work stage 16 holds the color filter substrate P transported from a transport apparatus (not shown) on the XY plane by a vacuum suction mechanism (not shown).

  The droplet discharge head 5 is electrically connected to the control unit 31 via the first wiring 41. The droplet discharge head 5 has a plurality of nozzles N (see FIG. 2), and discharges droplets of color filter material based on drawing data and drive control signals input from the control unit 31. The droplet discharge heads 5 are provided corresponding to the color filter materials R (red), G (green), and B (blue). The droplet discharge head 5 is connected to the tank 33 via a tube 44.

  The droplet discharge head 5 includes a bearing mechanism (not shown) such as a pole screw or a linear guide in the Y-axis direction and the Z-axis direction. The droplet discharge head 5 is movable in the Y-axis direction and the Z-axis direction based on the position control signal indicating the Y coordinate and the Z coordinate input from the control unit 31.

  The tube 44 is a tube for supplying a color filter material that connects the tank 33 and the droplet discharge head 5. The tank 33 stores three color filter materials: a color filter material for R (red), a color filter material for G (green), and a color filter material for B (blue). The tank 33 stores the color filter materials of three colors and supplies the color filter materials to the droplet discharge heads 5 corresponding to the three colors via the tubes 44.

  The sheet member transport table 11 is movable in the X-axis direction by a transport table moving device (not shown). The sheet member conveying table 11 is a conveying table for the sheet member 15 that conveys the belt-shaped sheet member 15 supplied from the supply reel 12. The sheet member 15 supplied from the supply reel 12 is taken up by the take-up reel 13.

  The sheet member 15 is a recording medium on which dot-shaped landing areas of ink (functional liquid) ejected from a plurality of nozzles N of the droplet ejection head 5 can be recorded. As the sheet member 15, for example, recording paper such as roll paper can be used. In addition, as the sheet member 15, a substrate having water repellency such as a glass substrate can be used instead of the roll paper.

  Further, the sheet member 15 may be used for confirming the discharge state (nozzle omission and bending) of the plurality of nozzles N of the droplet discharge head 5 before production, that is, before drawing on the color filter substrate P. is there.

  The area measuring camera 14 is disposed at a position facing the recording surface (upper surface) of the sheet member 15 on the sheet member conveying table 11. The area measurement camera 14 is a camera that photographs the landing area of ink ejected from the plurality of nozzles N to the sheet member 15. The area measurement camera 14 is electrically connected to the analysis unit 32 via the second wiring 42. The area measurement camera 14 outputs image data of the shot ink landing area to the analysis unit 32.

  The analysis unit 32 detects the landing area by performing image processing on the image data of the ink landing area photographed by the area measurement camera 14, and based on correction data defining the relationship between the landing area and the ink weight, which will be described later. This has a function of obtaining the ink weight distribution in the plurality of nozzles N. The analysis unit 32 is electrically connected to the control unit 31 via the third wiring 43. The analysis unit 32 outputs the measurement data of the ink weight distribution at the plurality of nozzles N to the control unit 31.

  The control unit 31 adjusts the voltage applied to the drive element PZ (see FIG. 2) based on the measurement data of the ink weight distribution at the plurality of nozzles N input from the analysis unit 32. Specifically, the control unit 31 adjusts the voltage applied to the drive element PZ so that the ink weight in the plurality of nozzles N approaches a predetermined appropriate weight. Then, the variation in the ink discharge amount of the plurality of nozzles N is adjusted by the drive element PZ. That is, the variation in the ink discharge amount among the plurality of nozzles N is corrected. After the variation in the ink discharge amount is corrected by the drive element PZ, the droplets of the color filter material are discharged to a predetermined position on the color filter substrate P from the plurality of nozzles N of the droplet discharge head 5.

  FIG. 2 is a schematic diagram showing a schematic configuration of the droplet discharge head 5. 2A is a plan view of the droplet discharge head 5 viewed from the work stage 16, FIG. 2B is a partial perspective view of the droplet discharge head 5, and FIG. It is a fragmentary sectional view of 1 nozzle.

As shown in FIG. 2A, the droplet discharge head 5 includes a plurality of (for example, 180) nozzles N 1 to N 180 arranged in the Y-axis direction. A nozzle row NA is formed by the nozzles N 1 to N 180 . Although FIG. 2A shows one row of nozzles, the number of nozzles and the number of nozzle rows provided in the droplet discharge head 5 can be arbitrarily changed, and the nozzles for one row arranged in the Y-axis direction are arranged as X. A plurality of rows may be provided in the axial direction.

2B, the droplet discharge head 5 includes a vibration plate 20 provided with a material supply hole 20a connected to a tube 44, and a nozzle plate 21 provided with nozzles N 1 to N 180. A liquid reservoir 22 provided between the vibration plate 20 and the nozzle plate 21, a plurality of partition walls 23, and a plurality of storage chambers 24 are provided. Drive elements PZ 1 to PZ 180 are arranged on the vibration plate 20 corresponding to the nozzles N1 to N180. The drive elements PZ 1 to PZ 180 are, for example, piezo elements.

The liquid reservoir 22 is filled with a liquid color filter material supplied through the material supply hole 20a. The storage chamber 24 is formed so as to be surrounded by the vibration plate 20, the nozzle plate 21, and a pair of partition walls 23. The storage chamber 24 is provided in a one-to-one correspondence with each of the nozzles N 1 to N 180 . In addition, the color filter material is introduced into the respective storage chambers 24 from the liquid reservoir 22 through a supply port 24 a provided between the pair of partition walls 23.

As shown in FIG. 2C, the drive element PZ 1 is obtained by sandwiching a piezoelectric material 25 between a pair of electrodes 26. The drive element PZ 1 is configured such that the piezoelectric material 25 contracts when a drive signal is applied to the pair of electrodes 26. The vibration plate 20 such drive elements PZ 1 is disposed, wrinkles become integral with the drive element PZ 1 applies a driving signal to the pair of electrodes 26 to the outside (opposite side of the accommodating chamber 24) at the same time It bends, and thereby the volume of the storage chamber 24 is increased.

Accordingly, the color filter material corresponding to the increased volume in the storage chamber 24 flows from the liquid reservoir 22 through the supply port 24a. Further, when the application of the drive signal to the drive element PZ 1 is stopped from such a state, the drive element PZ 1 and the diaphragm 20 both return to the original shape, and the storage chamber 24 also returns to the original volume. Accordingly, accommodation chamber pressure of the color filter material 24 is increased, the droplet L of the color filter material is ejected toward the nozzle N 1 on the color filter substrate P. In addition, by using the drive element PZ 1 , it is possible to cause fine vibration in the storage chamber 24 and adjust the ink discharge amount with high accuracy.

  FIG. 3 is an explanatory diagram of a method for forming a color filter layer (color filter) CF on the color filter substrate P using the droplet discharge head 5. FIG. 3A is a schematic plan view of a color filter substrate P that is an ink discharge target. FIG. 3B is a partially enlarged plan view of the color filter substrate P.

  In FIG. 3A, a plurality of panel areas CA are set on the surface of a large-area color filter substrate P formed of glass, plastic or the like. Each panel area CA is separated (cut) from each other and provided as an individual color filter substrate. In each panel area CA, as shown in FIG. 3B, a plurality of pixels PX (predetermined areas) arranged in a dot shape are provided. The pixels PX are arranged in a matrix in each panel area CA, and a color filter layer (colored layer) CF is formed for each pixel PX.

  The vertical direction (indicated by arrows A1 and A2) in FIG. 3B is the main scanning direction, and the direction orthogonal to the main scanning direction (left and right direction in the drawing) is the sub-scanning direction. Arranged on the filter substrate P. Then, while moving (scanning) the color filter substrate P relative to the droplet discharge head 5 in the main scanning direction and the sub-scanning direction, ink containing a coloring material from a plurality of nozzles N of the droplet discharge head 5 ( Color filter material) is discharged, and a color filter layer CF is formed on each pixel PX on the color filter substrate P.

  The droplet discharge head 5 is scanned a plurality of times for one panel area CA. For example, after the droplet discharge head 5 is scanned in the main scanning direction, the droplet discharge head 5 is moved (scanned) in the sub-scanning direction, and scanning is performed again in the main scanning direction. After moving (sub-scanning) from the left end to the right end of one panel area CA, it returns to the left end of the panel area CA again, and scans in the main scanning direction at a position slightly different from the position where the ejection has already been performed. Then, by performing such scanning a plurality of times, the color filter layer CF having a desired film thickness is formed on all the pixels PX in the panel area CA.

  In FIG. 3B, the reason why the droplet discharge head 5 is inclined with respect to the sub-scanning direction is to match the pitch of the nozzles N of the droplet discharge head 5 with the pitch of the pixels PX. If the pitch of the nozzles N and the pitch of the pixels PX are set so as to satisfy a predetermined correspondence relationship, it is not necessary to tilt the droplet discharge head 5 obliquely.

  The color filter layer CF is formed by arranging R, G, and B colors in an appropriate arrangement form such as a so-called stripe arrangement, delta arrangement, mosaic arrangement, or the like. Therefore, in the ink ejection process shown in FIG. 3B, the droplet ejection heads 5 that eject R, G, and B color filter materials are prepared in advance for the three colors R, G, and B. Then, an array of three color filter layers CF of R, G, and B is formed on one color filter substrate P using these droplet discharge heads 5 in order.

  By the way, generally in a droplet discharge head, there is a slight variation in ink discharge characteristics (discharge amount) between nozzles (see FIG. 4). If there is a variation in the amount of ink discharged between the nozzles, the amount of ink disposed on the color filter substrate P varies due to this variation, which causes unevenness in the color filter.

  FIG. 4 is a diagram illustrating ejection characteristics of the droplet ejection head before correction of variations in ink ejection amount. In FIG. 4, the horizontal axis indicates nozzle numbers 1 to 180 of the nozzle row NA. Also, the solid line Cs in FIG. 4 indicates the ink landing area corresponding to each nozzle number. A solid line Cv indicates the landing volume of ink corresponding to each nozzle number. As shown in FIG. 4, when the ink landing volume Cv corresponding to each nozzle number is seen, the amount of change is relatively larger than the ink landing area Cs corresponding to each nozzle number in the nozzles at both ends and the center. It has become.

  Therefore, in the droplet discharge method of the present invention, the voltage applied to the drive element PZ of the droplet discharge head 5 is adjusted before drawing on the color filter substrate P before correction (before production), and a plurality of nozzles A step of adjusting the ink ejection characteristics at N is provided. Hereinafter, an example of the droplet discharge method of the present invention will be described.

(Droplet ejection method)
FIG. 5 is a flowchart showing the steps of the droplet discharge method of the present invention. In the droplet discharge method of the present invention, the apparatus is positioned at a predetermined position and the apparatus is aligned (step S1), and the voltage applied to the drive element PZ is kept constant. "First landing process" (step S2) for landing on the sheet member 15, and the first landing area landed on the sheet member 15 after the first landing process is detected, and the relationship between the first landing cross-sectional area and the ink weight "First analysis step" (step S3) for obtaining the ink weight distribution in the plurality of nozzles N on the basis of the correction data defining the above, "sheet member winding step" (step S4) for winding the sheet member 15; A “second landing step” (step S5) in which the voltage applied to the drive element PZ is adjusted so that the ink weight of the plurality of nozzles N approaches a predetermined appropriate weight, and ink is landed on the sheet member 15; A.

  First, the apparatus is positioned at a predetermined position to align the apparatus (step S1 in FIG. 5). Specifically, the sheet member conveyance table 11 is moved in the X-axis direction toward the work stage 16 and is disposed immediately below the droplet discharge head 5. As a result, the sheet member 15 on the sheet member conveyance table 11 is disposed so as to face the plurality of nozzles N of the droplet discharge head 5.

  Next, the voltage applied to the drive element PZ is made constant, and ink is landed on the sheet member 15 (step S2 in FIG. 5). The ink is preferably landed in an appropriate arrangement form such as a stripe arrangement, a delta arrangement, or a mosaic arrangement in accordance with the color filter layer CF. This ensures the discharge state before correction (when discharging to the sheet member 15) of the plurality of nozzles N of the droplet discharge head 5 and the discharge state after correction (when discharging to the color filter substrate P). To be consistent.

  In addition, when the ink is landed on the sheet member 15, it is preferable to land the ink in a plurality of times. Specifically, first, the first ink is landed on a predetermined area on the sheet member 15. Next, the second ink is landed on a region where the first ink is not landed. Thereby, since ink can be repeatedly landed on the sheet member 15 a plurality of times, the sheet member 15 can be used effectively without waste.

  Next, the landing area landed on the sheet member 15 is detected, and the distribution of the ink weight in the plurality of nozzles N is obtained based on the correction data defining the relationship between the landing cross-sectional area and the ink weight (step S3 in FIG. 5). ). Specifically, first, a plurality of inks having different weights are arranged on the sheet member 15. For example, two types of inks Iw1 and Iw2 of an ink Iw1 having an ink weight of 10 ng and an ink Iw2 having an ink weight of 20 ng are arranged on the sheet member 15 (see FIG. 6).

  FIG. 6 is a diagram illustrating a state in which two types of inks Iw1 and Iw2 having different weights are arranged on the sheet member 15. FIG. 6A is a perspective view showing an arrangement state of the ink Iw1 having an ink weight of 10 ng. FIG. 6B is a cross-sectional view showing an arrangement state of the ink Iw1 having an ink weight of 10 ng. FIG. 6C is a perspective view showing an arrangement state of the ink Iw2 having an ink weight of 20 ng. FIG. 6D is a cross-sectional view showing an arrangement state of the ink Iw2 having an ink weight of 20 ng. In FIGS. 6A and 6B, reference numeral S1 denotes a landing area of the ink Iw1, reference numeral V1 denotes a landing volume of the ink Iw1, and reference numeral H1 denotes a landing height of the ink Iw1. In FIG. 6C and FIG. 6D, symbol S2 is the landing area of the ink Iw2, symbol V2 is the landing volume of the ink Iw2, and symbol H2 is the landing height of the ink Iw2.

  As shown in FIGS. 6A and 6C, the shapes of the two types of inks Iw1 and Iw2 arranged on the sheet member 15 are substantially cylindrical. The reason that the shapes of the inks Iw1 and Iw2 are substantially cylindrical is that a receiving layer (not shown) is formed on the sheet member 15. That is, the pigment molecules of the inks Iw1 and Iw2 are stacked without penetrating into the receiving layer.

  The amount of change between the landing area S1 of the ink Iw1 and the landing area S2 of the ink Iw2 is smaller than the amount of change between the landing volume V1 of the ink Iw1 and the landing volume V2 of the ink Iw2. This is because the landing height of the ink stacked on the sheet member 15 is changed between the ink Iw1 and the ink Iw2. Specifically, as shown in FIGS. 6A and 6C, the landing height H2 of the ink Iw2 stacked on the sheet member 15 is higher than the landing height H1 of the ink Iw1. (H1 <H2).

  Next, the landing area S1 of two types of inks Iw1 and Iw2 having different weights discharged from the plurality of nozzles N to the sheet member 15 by the area measurement camera 14 disposed at a position facing the upper surface of the sheet member 15. Shoot S2. Thereby, the landing area with respect to a plurality of types of ink weights can be measured. At this time, the magnification of the lens of the area measurement camera 14 is preferably set to 4 to 10 times, for example, in terms of measurement accuracy and measurement time. Further, the N number for measuring the ink landing area is preferably set to N = 20 to 30 from the viewpoint of measurement accuracy.

  The image data of the landing area for a plurality of types of ink weights photographed by the area measurement camera 14 is output to the analysis unit 32. Then, the amount of change in the landing area with respect to a plurality of types of ink weight is measured by the analysis unit 32. The measurement data of the change amount of the landing area with respect to the ink weight at the plurality of nozzles N measured by the analysis unit 32 is output to the control unit 31.

  On the other hand, the change amount of the landing volume with respect to a plurality of types of ink weights is input to the control unit 31. The amount of change in the landing volume with respect to the plurality of types of ink weight is such that even if a plurality of inks having different weights are arranged, there is no loss of ink weight due to evaporation of the ink solvent between the plurality of types of ink and the ink volume does not change. It is regarded as a reference value (see FIG. 7).

  FIG. 7 is a diagram showing the relationship between the change amount of the landing area with respect to the ink weight and the change amount of the landing volume with respect to the ink weight. In FIG. 7, symbol Ls represents a landing area with respect to ink weight, and symbol Lv represents a landing volume with respect to ink weight. Further, symbol ΔS is a change amount of the landing area with respect to the ink weight between the ink Iw1 and the ink Iw2, and symbol ΔV is a change amount of the landing volume with respect to the ink weight between the ink Iw1 and the ink Iw2.

  As shown in FIG. 7, the change amount ΔS of the landing area with respect to the ink weight between the ink Iw1 and the ink Iw2 is smaller than the change amount ΔV of the landing volume with respect to the ink weight between the ink Iw1 and the ink Iw2. Yes. This is because the landing height of the ink stacked on the sheet member 15 changes as described above.

  Here, the present inventor has found a certain relationship between the landing area and the ink weight of the plurality of nozzles. In other words, the present inventor has found that there is a certain relationship between the amount of change in the landing area with respect to the ink weight and the amount of change in the landing volume with respect to the ink weight. Hereinafter, the relationship between the change amount of the landing area with respect to the ink weight and the change amount of the landing volume with respect to the ink weight will be described.

  The ink weight ratio between the ink Iw1 (ink weight 10 ng) and the ink Iw2 (ink weight 20 ng) is 1: 2. For example, if there is no loss of ink weight between these two types of ink and the ink landing volumes V1 and V2 do not change, the ratio of the ink landing volumes V1 and V2 is 1: 2 as with the ink weight ratio. Become. That is, the change amount ΔV of the landing volume with respect to the ink weight can be set to a reference value (for example, 1) on the assumption that there is no loss of ink weight between the two types of ink and the ink landing volumes V1 and V2 do not change. . On the other hand, the change amount ΔS of the ink landing area is 0.7 (ΔS = 0.7) when the change amount ΔV = 1 of the ink landing volume.

  In this embodiment, compared to the conventional method of measuring the weight of ink ejected from a plurality of nozzles, the ejection amount is measured based on correction data that defines the relationship between the landing area and the ink weight at the plurality of nozzles N. Is used. As a result, measurement becomes easy, and enormous man-hours are not required for measuring the discharge amount.

  Next, the sheet member 15 is wound up (step S4 in FIG. 5). Specifically, the sheet member 15 on which ink is landed is taken up by the take-up reel 13. That is, a new sheet member 15 that is not landed with ink is supplied from the supply reel 12.

  Next, the voltage applied to the drive element PZ is adjusted to land the ink on the sheet member 15 (step S5 in FIG. 5). Specifically, the voltage applied to the drive element PZ provided for each of the plurality of nozzles N is adjusted by the control unit 31.

  FIG. 8 is a diagram showing the ejection characteristics of the droplet ejection head before and after correcting the variation in the ink ejection amount. In FIG. 8, the horizontal axis indicates the nozzle numbers 1 to 180 of the nozzle row NA, and the vertical axis indicates the discharge amount of the nozzle corresponding to each nozzle number. As shown in FIG. 8, when the solid line before the correction of the variation in the ink discharge amount is seen, it can be seen that the ink discharge amount tends to be relatively large at the nozzles at both ends and the central portion.

  For example, a predetermined voltage is applied to the drive element PZ corresponding to the nozzle in the region where the ink ejection amount is relatively small in the initial state (see the solid line before correction in FIG. 8). On the other hand, no voltage is applied to the drive element PZ corresponding to the nozzle in the region where the ink discharge amount is relatively large in the initial state.

  Specifically, the control unit 31 adjusts the voltage applied to the drive element PZ from the measurement data of the change amount ΔV of the landing volume with respect to the plurality of types of ink weights and the change amount ΔS of the landing area with respect to the ink weights. . That is, the control unit 31 adjusts so that the change amount ΔS of the landing area with respect to the ink weight is the same as the change amount ΔV of the landing volume with respect to the ink weight. Here, the adjustment amount of the voltage applied to the drive element PZ is represented by ΔV / ΔS. For example, assuming that the change amount ΔV of the ink landing volume is a reference value (ΔV = 1) and the change amount ΔS of the ink landing area is 0.7, the adjustment amount of the voltage applied to the drive element PZ is about 1.4 ( ΔV / ΔS = 1 / 0.7).

  In this way, the variation in the discharge amount generated between the plurality of nozzles N is adjusted by the drive element PZ. As a result, the variation in the ink ejection amount among the plurality of nozzles N is corrected. That is, the variation in the ink discharge amount that has occurred between the plurality of nozzles N in the initial state (solid line before correction) can be approximately averaged as indicated by the solid line after correction.

  According to the droplet discharge device 1 of the present embodiment, the landed image of the ink discharged from the plurality of nozzles N is captured by the area measurement camera 14. Then, the distribution of the weight of the ink ejected from the plurality of nozzles N is obtained by the analysis unit 32. Then, the voltage applied to the drive element PZ by the control unit 31 is adjusted so that the ink weight in the plurality of nozzles N approaches a predetermined appropriate weight. Thereby, the variation of the ink discharge amount in the plurality of nozzles N is adjusted. That is, the control unit 31 corrects the variation in the ink discharge amount of the plurality of nozzles N. This is because the present inventor found a certain relationship between the ink landing area and the ink weight in the plurality of nozzles N. For this reason, it is possible to discharge a uniform amount of ink from all the nozzles of the droplet discharge head 5. Accordingly, it is possible to suppress the deterioration of the image quality by making the stripes inconspicuous. Further, the method of measuring the ejection amount based on the correction data that defines the relationship between the landing area of the ink ejected from the plurality of nozzles N and the ink weight is more than the conventional method of measuring the weight of the ejected ink. Therefore, it does not take a huge amount of man-hours and is excellent in production efficiency. Further, since the sheet member 15 on which the ink ejected from the plurality of nozzles N has been landed is appropriately transported, the landed area can be measured efficiently.

  According to the droplet discharge method of the present embodiment, the ink weight distribution in the plurality of nozzles N is obtained by the first analysis step after the first landing step. Then, the ink weight at the plurality of nozzles N is adjusted to approach a predetermined appropriate weight by the second landing process. As a result, the variation in the ink discharge amount among the plurality of nozzles N is corrected. For this reason, it is possible to discharge a uniform amount of ink from all the nozzles N of the droplet discharge head 5. Accordingly, it is possible to suppress the deterioration of the image quality by making the stripes inconspicuous.

  In the droplet discharge method, after the second landing step, the second landing area of the ink landed on the sheet member 15 is detected, and the second landing area and the discharge of the ink discharged from the plurality of nozzles N are detected. A second analysis step of obtaining a distribution of ejection weights of the plurality of nozzles N based on correction data defining a relationship with the weight, and an ink ejection weight of the plurality of nozzles N approaching a predetermined appropriate weight from the distribution; The third landing step of adjusting the voltage applied to the driving element PZ and landing the ink on the sheet member 15 may be provided at least once.

  According to this manufacturing method, after the second landing process, the analysis process and the landing process are repeatedly performed a plurality of times, so that variations in the ink discharge amounts of the plurality of nozzles N are reliably adjusted. For this reason, it becomes possible to discharge a substantially uniform amount of ink from all the nozzles N of the droplet discharge head 5. Therefore, it is possible to make the unevenness more inconspicuous and to suppress the deterioration of the image quality.

  In the droplet discharge method, the ink that is landed in the second landing process is arranged in an appropriate arrangement form in the same manner as in the first landing process (step S2 in FIG. 4), following the color filter layer CF. It ’s better to land. Thereby, the ejection state before correction of the plurality of nozzles N of the droplet ejection head 5 and the ejection state after correction are surely matched.

  Further, according to the method for producing a color filter of the present invention, since a uniform amount of ink is ejected from all nozzles of the droplet ejection head as described above, it is possible to produce a high-quality color filter without streaks. it can.

  In the above embodiment, the case where the color filter is manufactured using the droplet discharge device 1 in which the variation in the ink discharge amount between the nozzles is adjusted has been described. However, the present invention is not limited to this. For example, the droplet discharge device 1 of the present invention can be applied not only to the manufacture of a color filter but also to a film forming process in which uniform film thickness is required and the formation of stripes becomes a problem.

DESCRIPTION OF SYMBOLS 1 ... Droplet discharge apparatus, 5 ... Droplet discharge head, 12 ... Supply reel, 13 ... Take-up reel, 14 ... Area measurement camera (imaging device), 24 ... Storage chamber, 31 ... Control unit (control means), 32 ... Analysis unit (analysis means), CF ... Color filter layer (color filter), Iw1, Iw2 ... Ink (functional liquid), N ... Nozzle, P ... Color filter substrate (base material), PZ ... Drive element, S1, S2 ... Landing area

Claims (4)

  1. A droplet discharge head having a plurality of nozzles for discharging a functional liquid, and a plurality of drive elements provided corresponding to the plurality of nozzles;
    A supply reel for supplying a sheet member for landing the functional liquid discharged from the plurality of nozzles;
    A take-up reel that winds up the sheet member supplied from the supply reel;
    An imaging device that captures an image of the functional liquid ejected from the plurality of nozzles with respect to the sheet member between the supply reel and the take-up reel;
    The image captured by the imaging device is subjected to image processing to detect the landing area of the functional liquid on the sheet member, and the relationship between the landing area and the discharge weight of the functional liquid discharged from the plurality of nozzles Analyzing means for obtaining a distribution of the discharge weight in the plurality of nozzles based on correction data defining
    And a control unit that adjusts a voltage applied to the plurality of drive elements so that the discharge weight of the plurality of nozzles approaches a predetermined appropriate weight from the distribution.
  2. A droplet discharge method using a droplet discharge head having a plurality of nozzles for discharging a functional liquid and a plurality of drive elements provided corresponding to the plurality of nozzles,
    A first landing step of landing the functional liquid on a sheet member with a constant voltage applied to the plurality of driving elements;
    After the first landing step, the first landing area of the functional liquid landed on the sheet member is detected, and the relationship between the first landing area and the discharge weight of the functional liquid discharged from the plurality of nozzles A first analysis step for obtaining a distribution of the discharge weights of the plurality of nozzles based on correction data defining
    A second landing step of adjusting the voltage applied to the plurality of driving elements so that the discharge weight of the plurality of nozzles approaches a predetermined appropriate weight from the distribution and landing the functional liquid on the sheet member; A droplet discharge method comprising:
  3. After the second landing step, a second landing area of the functional liquid landed on the sheet member is detected, and a relationship between the second landing area and the discharge weight of the functional liquid discharged from the plurality of nozzles A second analysis step for obtaining a distribution of the discharge weights in the plurality of nozzles based on correction data defining
    A third landing step of adjusting the voltage applied to the plurality of drive elements so that the discharge weight of the plurality of nozzles approaches a predetermined appropriate weight from the distribution and landing the functional liquid on the sheet member; The droplet discharge method according to claim 2, wherein the droplet discharge method is provided at least once.
  4.   A method for producing a color filter, comprising: using the droplet discharge method according to claim 2 or 3 to form a color filter by disposing the functional liquid in a predetermined region provided on a substrate.
JP2009050317A 2009-03-04 2009-03-04 Liquid drop discharge device, liquid drop discharge method, and method of manufacturing color filter Withdrawn JP2010204409A (en)

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Publication number Priority date Publication date Assignee Title
JP2004090621A (en) * 2002-07-08 2004-03-25 Canon Inc Apparatus and method for discharging liquid and apparatus and method for manufacturing panel for display device
JP2005077170A (en) * 2003-08-29 2005-03-24 Seiko Epson Corp Microarray manufacture device, and method of manufacturing microarray
JP2006058772A (en) * 2004-08-23 2006-03-02 Ishii Hyoki Corp Method for forming alignment layer and ink-jet type print head jetting inspection apparatus
JP2008229602A (en) * 2007-02-22 2008-10-02 Seiko Epson Corp Discharge amount-measuring method, discharge amount-adjusting method, liquid-discharging method, color filter-manufacturing method, liquid crystal display device-manufacturing method, and electro-optical device-manufactruing method
JP2008264608A (en) * 2007-04-16 2008-11-06 Shibaura Mechatronics Corp Liquid droplet coating apparatus and liquid droplet coating method
WO2009022663A1 (en) * 2007-08-10 2009-02-19 Toray Engineering Co., Ltd. Inkjet head bar and coating device using same

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004090621A (en) * 2002-07-08 2004-03-25 Canon Inc Apparatus and method for discharging liquid and apparatus and method for manufacturing panel for display device
JP2005077170A (en) * 2003-08-29 2005-03-24 Seiko Epson Corp Microarray manufacture device, and method of manufacturing microarray
JP2006058772A (en) * 2004-08-23 2006-03-02 Ishii Hyoki Corp Method for forming alignment layer and ink-jet type print head jetting inspection apparatus
JP2008229602A (en) * 2007-02-22 2008-10-02 Seiko Epson Corp Discharge amount-measuring method, discharge amount-adjusting method, liquid-discharging method, color filter-manufacturing method, liquid crystal display device-manufacturing method, and electro-optical device-manufactruing method
JP2008264608A (en) * 2007-04-16 2008-11-06 Shibaura Mechatronics Corp Liquid droplet coating apparatus and liquid droplet coating method
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