JP2014159089A - Printer and printing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printer based on a manufacturing method which can stably form a printing pattern free from a printing defect on a printing substrate without inspecting the printing substrate.SOLUTION: The printing method includes a process for transferring an ink pattern from a printing plate 101 to an inspection roll 200, an imaging process for imaging the ink pattern transferred on the inspection roll with an inspection camera, a process for marking at a position on the printing plate corresponding to the same position as that of the printing substrate 106, and a process for grasping a distance from the marked position synchronizing with a platen position changing mechanism with information from the imaging process and relatively moving the position so as to transfer a defect to a desired position of the printing substrate.

Description

  The present invention relates to a printing apparatus for producing a polymer organic EL display panel and a method for producing a polymer organic EL display panel.

  An organic electroluminescence (hereinafter referred to as EL) element is a light emitting element having a structure in which an organic light emitting layer made of an organic light emitting material is formed between an anode and a cathode facing each other. Holes and electrons are injected respectively, and they emit light by causing recombination in the organic light emitting layer. However, in order to obtain efficient light emission, the film thickness of the organic light emitting layer is an important factor. Therefore, it is necessary to control the film thickness from about several nm to several tens of nm. Further, in order to make this a display, it is necessary to pattern it with high definition.

  The organic light emitting material used for the organic light emitting layer is classified into a low molecular material and a polymer material, and the method of forming the organic light emitting layer differs depending on the type of the organic light emitting material.

  In general, a low molecular weight material forms a thin film on a substrate by resistance heating vapor deposition (vacuum vapor deposition) or the like. When full-coloring an organic EL element, a method of forming a light emitting material of a different light emission color on each pixel by using a vapor deposition mask having a pattern corresponding to the pixel shape of each color is employed. Although this method is an excellent method for uniformly forming a thin film shape, there is a problem in that the mask pattern accuracy is difficult to be obtained when the deposited substrate becomes large.

  On the other hand, for polymer materials, a method of forming a thin film by dissolving or dispersing an organic light emitting material in a solvent to form an ink and applying it by a wet coating method is mainly used. As the wet coating method, there are a spin coating method, a bar coating method, a discharge coating method, a dip coating method, and the like, but it is difficult to use these methods for high-definition patterning or color separation for full color. . Therefore, it is considered that pattern printing by an ink jet method or a printing method is effective as a means for patterning the organic light emitting material layer for full color.

  As one of high-definition patterning methods, for example, there is an ink jet method in which a pattern is formed by ejecting an organic light emitting material dissolved in a solvent from an ink jet nozzle onto a substrate and drying it on the substrate (see Patent Document 1). In this method, since the ink droplets ejected from the nozzle are spherical, the ink spreads in a circular shape when landing on the substrate, and the formed pattern shape is not linear or has landed. There is a problem that the linearity of the pattern cannot be obtained due to poor accuracy.

  On the other hand, letterpress printing, reversal printing, screen printing, and the like have been proposed as pattern forming methods by printing. In organic EL elements and displays, a glass substrate is often used as a base material, and a method using a hard printing plate made of metal such as a gravure printing method is not suitable. Therefore, a printing method using a rubber printing plate having elasticity, an offset printing method using a rubber printing blanket, a relief printing plate using a photosensitive resin plate mainly composed of elastic rubber or other resin. The printing method is considered an appropriate printing method. Actually, as a trial of these printing methods, a pattern printing method by offset printing (see Patent Document 2), a pattern printing method by letterpress printing (see Patent Document 3), and the like have been proposed. In particular, the method using relief printing is excellent in pattern formation accuracy and film thickness uniformity, and is most suitable as a method for producing an organic EL element by printing.

  An example of the manufacturing process of the organic EL element by the relief printing method is shown below. First, ink is applied to the surface of an anilox roll having fine holes. Next, the ink applied per unit area of the anilox roll is made uniform by scraping off excess ink on the anilox roll surface with a doctor. Thereafter, the ink on the anilox roll is transferred onto the printing plate patterned corresponding to the pixel shape of the organic EL element. Finally, the light-emitting layer of the organic EL element is formed by transferring the ink thin film on the printing plate onto the substrate.

  FIG. 1 illustrates an example of a printing process for forming a light emitting portion by a relief printing method. Ink is stored in the ink pan 103 shown in FIG. After the ink is supplied to the anilox roll 104 in the ink pan 103, the excess ink on the anilox roll 104 is scraped off by the doctor 105, and the ink is stored only inside the hole. The ink inside the hole is transferred onto the image forming portion of the relief plate 101 wound around the plate cylinder 102 that rotates relative to the anilox roll 104, and forms a thin film of ink there. Further, the thin film formed on the image forming unit is transferred onto the printing substrate 106 that moves relative to the plate cylinder 102.

  When an organic EL element is produced by a relief printing method, the transfer pattern on the printing plate is arranged with a plurality of transfer patterns for forming the same color light emitting part among a plurality of light emitting parts constituting each pixel of the organic EL element. The organic light emitting layer pattern is obtained by sequentially printing light emitting portions that emit light of the respective emission colors.

As described above, in the relief printing method, the ink is transferred from the anilox roll to the resin relief plate, and further, the ink on the resin relief plate is transferred to the printing substrate to obtain a desired organic light emitting layer pattern. The resin pattern formed thereon needs to be a pattern opposed to a desired organic light emitting layer pattern formed on the substrate to be printed. However, if the resin pattern formed on the resin relief plate has chips, protrusions, or adhered foreign matter, a printing defect caused by the pattern is formed on the substrate to be printed. Has a problem that it occurs as a defect common to all the substrates to be printed continuously.
In addition, these defects attached during printing may occur on each printed board, and it is very difficult to grasp the source of the transfer defect during printing.

For this reason, a method for preventing the occurrence of continuous print defects by removing the printed substrate to be printed and performing the inspection is employed. Due to the deterioration in characteristics, there is a problem that the reproduction cannot be performed by correcting the defective portion of the substrate to be printed on which the printing defect has occurred, leading to a decrease in yield and an increase in cost.
In addition, production instability due to the inability to grasp the cause of those defects that occur during printing is also a problem.

Japanese Patent Laid-Open No. 10-12377 JP 2001-93668 A JP 2001-155858 A

  The present invention has been made to solve the above-described problems, and is based on a manufacturing method capable of stably forming a print pattern without a print defect on a substrate to be printed without inspecting the substrate to be printed. It is an object to provide a printing apparatus.

As means for solving the above-mentioned problems, the invention according to claim 1 is characterized in that a printing plate and a substrate to be printed on which an ink pattern is transferred from the printing plate are placed and the relative position between the printing plate and the printing plate is adjusted Movable surface plate, inspection roll for transferring and inspecting the ink pattern from the printing plate instead of the substrate to be printed, and roll inspection for inspecting the ink pattern transferred to the inspection roll A printing apparatus comprising: an apparatus; and a platen position changing mechanism for changing a position of the movable platen and adjusting a relative position between the printing substrate and the printing plate,
The roll inspection apparatus has a function of inspecting the presence or absence of defects in the ink pattern transferred to the inspection roll and its position,
In the surface plate position changing mechanism, the coordinate position of the substrate to be printed and the coordinate position of the inspection roll are input in advance in association with each other, and the surface plate position changing mechanism is inspected by the roll inspection apparatus. A printing apparatus having a function of adjusting a relative position between the printing plate and the movable surface plate based on information.

  The roll inspection apparatus may include an illumination unit that illuminates the ink pattern transferred to the inspection roll, and an inspection camera for imaging the ink pattern. The printing apparatus according to claim 1.

  The invention according to claim 3 is the printing apparatus according to claim 1 or 2, further comprising an inspection roll cleaning unit and an inspection roll drying unit.

  The invention according to claim 4 is the printing apparatus according to any one of claims 1 to 3, wherein the printing plate is a relief plate.

The invention according to claim 5 is a printing method using the printing apparatus according to any one of claims 1 to 4,
Transferring an ink pattern from the printing plate to the inspection roll;
Inspecting the presence or absence of defects in the ink pattern transferred to the inspection roll and the position thereof,
When there is a defect in the ink pattern, based on this inspection information, the relative position between the printing plate and the moving surface plate so that the defect is located at a desired position on the substrate to be printed. Adjusting the process,
A printing method characterized by comprising:

In the invention according to claim 6, the printing plate is attached to a plate cylinder,
6. The step of adjusting a relative position between a printing plate and a moving surface plate is performed by giving a speed difference between the plate cylinder and the moving surface plate. The printing method described in 1.

  By using the invention according to claims 1 to 6, printing is performed on the inspection roll instead of the substrate to be printed, and the printing pattern on the inspection roll is inspected, so that the printing pattern is not damaged. Thus, it is possible to stably form a print pattern free from printing defects.

FIG. 3 is a schematic cross-sectional view illustrating an example of a situation in which an ink pattern is printed on a substrate to be printed from a printing plate attached to a plate cylinder in the printing apparatus of the present invention. FIG. 3 is a schematic cross-sectional view showing an example of a situation in which ink is transferred from an inspection roll to a printing plate attached to a plate cylinder and an arrangement relation of the roll inspection apparatus in the printing apparatus of the present invention. FIG. 3 is a schematic cross-sectional view showing an example of an arrangement relationship among a roll inspection device, an inspection roll, an inspection roll cleaning unit, and an inspection roll drying unit in the printing apparatus of the present invention. In the printing apparatus of the present invention, the concept of a mechanism for performing the coordinate position movement of the substrate to be printed by controlling the driving of the moving surface plate using the information of the inspection roll captured by the inspection camera of the roll inspection apparatus. FIG. Schematic which shows the example of the printing result in the desired position in the case where the defect position is moved relatively and the case where it does not move using the present invention. 3 is a schematic cross-sectional view showing two examples of a method for transferring an ink pattern from a printing plate to a substrate to be printed in the printing apparatus of the present invention. FIG.

  FIG. 1 is a schematic sectional view showing an example of a situation in which an ink pattern is printed on a printing substrate from a printing plate attached to a plate cylinder in the printing apparatus of the present invention. Here, a description will be given using a relief printing method as a printing method in particular, but this is not a limitation. This printing apparatus supplies a plate cylinder 102, a printing plate 101 for forming a light emitting pattern formed around the plate cylinder 102, a moving surface plate 107 that conveys a substrate to be printed 106, and ink on the printing plate 101. An anilox roll 104, an ink pan 103 for supplying ink to the anilox roll 104, a doctor 105 for removing excess ink on the anilox roll 104, and an inspection roll for printing an ink pattern instead of the substrate 106 to be printed 200 and a roll inspection apparatus 201 that inspects a pattern on the inspection roll. Next, each configuration of the present invention will be described in detail.

  The plate cylinder 102 is disposed so as to be able to print on a substrate to be printed 106 placed on a moving surface plate 107, and is rotatably supported at a fixed position. The printing plate 101 is mounted on the peripheral surface of the plate cylinder 102. The anilox roll 104 is installed so as to be in parallel with the rotation axis of the plate cylinder 102 and in contact with the plate surface of the surface of the printing plate 101. The ink pan 103 is filled with ink, and is installed so that the anilox roll 104 and the ink in the ink pan 103 are in contact with each other. The substrate to be printed 106 is placed on a moving surface plate 107. The moving surface plate 107 is installed so as to be horizontally movable in a plane orthogonal to the rotation axis of the plate cylinder 102 and parallel to the plane on which the printing substrate 106 of the moving surface plate 107 is placed.

  In addition, the printing apparatus of the present invention includes an inspection roll 200 and a roll inspection apparatus 201 that move with the moving surface plate 107. The support base 700 is positioned below the plate cylinder 102 and installed horizontally, and the movable surface plate 107, the inspection roll 200, and the roll inspection apparatus 201 are placed on the support base 700 via a guide. The moving surface plate 107 is installed so as to be horizontally movable in a plane parallel to the plane on which the printed substrate 106 is placed.

  In the printing apparatus having the above-described configuration, the ink supplied from the ink pan 103 is uniformly held on the surface of the anilox roll 104 as the anilox roll 104 rotates, and then is applied to the plate surface of the printing plate 101 attached to the plate cylinder 102. Metastasize. The printing substrate 106 is fixed on the movable surface plate 107, and the printing start position is adjusted while the position is adjusted by a surface plate position changing mechanism 402 that is a position adjusting mechanism between the pattern of the printing plate 101 and the pattern formation position of the printing substrate 106. Move up. From the printing start position, the substrate to be printed 106 contacts the convex portion of the printing plate 101 and moves in synchronization with the rotation of the plate cylinder 102, and ink is transferred from the printing plate 101 to a predetermined position on the substrate 106 to be printed. An ink pattern is formed on the surface of the substrate 106. After the ink pattern is formed on the substrate 106 to be printed, a drying process using an oven or the like can be provided as necessary.

The anilox roll 104 according to the embodiment of the present invention supplies ink to the printing plate 101 while rotating at the same peripheral speed as the peripheral speed of the plate cylinder 102. Anilox roll 10
4 can be made of chromium or ceramics, and it is desirable that fine holes, concave portions, cell-like patterns for holding ink are formed on the outer peripheral surface of the anilox roll 104.

  The ink pan 103 according to the embodiment of the present invention includes an ink reservoir that immerses the lower peripheral surface portion of the anilox roll 104, a coater such as a dripping type inking unit, a fountain roll, a die coater, and a cap coater, or a combination thereof Things can be used. Further, it is desirable that an ink replenishing device (not shown) for replenishing ink and an ink tank (not shown) for storing ink are connected to the ink pan 103.

  In order to supply ink uniformly on the anilox roll 104, it is desirable to provide a doctor 105. The doctor 105 has a blade shape or a roll shape, and any of them may be used. When the ink pan 103 is an ink reservoir, the doctor 105 is positioned between the ink reservoir and the contact point between the anilox roll 104 and the printing plate 101 in the rotation direction of the anilox roll 104, and the scraped ink is It is preferable to fall into the ink reservoir.

  The material of the base material used for the printing plate 101 according to the embodiment of the present invention is only required to have mechanical strength against printing, and polyethylene, polystyrene, polybutadiene, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, polyamide In addition, known synthetic resins such as polyethersulfone, polyethylene terephthalate, polyethylene naphthalate, polyethersulfone, and polyvinyl alcohol, known metals such as iron, copper, and aluminum, and alloys thereof, or a laminate thereof can be used.

  Moreover, as a base material which comprises the printing plate 101, what maintains high dimensional stability is desirable, and a metal is used suitably as a material used as a base material. Examples of metals include iron, aluminum, copper, zinc, nickel, titanium, chromium, gold, silver, alloys thereof, and laminates. Especially, steel base materials mainly composed of iron in terms of workability and economy. Aluminum or aluminum base material can be preferably used.

  When forming the plate surface of the printing plate 101 with a resin, as a method for forming a convex portion on the plate surface, a photolithography method using a positive photosensitive resin, a photolithography method using a negative photosensitive resin, injection molding, Various pattern molding methods such as letterpress printing method, intaglio printing method, planographic printing method, stencil printing method, and laser ablation method can be used. From the viewpoint of improving the accuracy of the pattern, photolithography using a photosensitive resin. The photolithographic method using a negative photosensitive resin capable of forming a relief plate with the required accuracy is most desirable.

  When applying a photolithographic method using a photosensitive resin as a convex pattern forming method, the printing plate 101 is formed from a plate-shaped photosensitive resin laminate in which a base material layer, a reflection suppressing layer, and a photosensitive resin layer are sequentially laminated. It is most desirable to form a convex part. As a method for molding the photosensitive resin layer, a known method such as an injection molding method, a protruding molding method, a laminating method, a bar coating method, a slit coating method, or a comma coating method can be used.

When the plate surface of the printing plate 101 is formed of a resin, it is sufficient that the resin to be used has solvent resistance to ink, such as nitrile rubber, silicone rubber, isoprene rubber, styrene butadiene rubber, butadiene rubber, chloroprene rubber, butyl rubber, acrylonitrile rubber, In addition to rubber such as ethylene propylene rubber and urethane rubber, polyethylene, polystyrene, polybutadiene, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, polyamide, polyethersulfone, polyethylene terephthalate, polyethylene naphthalate, polyethersulfone, polyvinyl alcohol Synthetic resins such as those, copolymers thereof, cellulose derivatives, etc., fluorine-based elastomers, polytetrafluoroethylene, polyvinylidene fluoride, polyvinylidene fluoride and those A fluororesin such copolymers can select one or more.

  The printing plate 101 according to the embodiment of the present invention is used by winding the printing plate 101 having the convex pattern formed on the substrate as described above around the plate cylinder 102. As an alternative, a convex pattern may be formed directly on the plate cylinder 102.

  The ink used is adjusted to a viscosity suitable for coating from the ink pan 103 to the anilox roll 104 and for transferring from the anilox roll 104 to the printing plate 101. The viscosity of the ink is preferably 5 to 180 mPa · s. In the relief printing method used in the present embodiment, the ink is first transferred from the anilox roll 104 to the printing plate 101, but after the ink has been transferred from the anilox roll 104 to the relief plate 101 at a viscosity of 180 mPa · s or more. The ink does not level sufficiently on the printing plate 101, causing unevenness. In addition, when the transfer rate is 5 mPa · s or less, repelling unevenness is likely to occur in the pixel when transferred to the printing substrate 106.

  The amount of ink transferred from the anilox roll 104 onto the printing plate 101 is determined by the film thickness to be formed on the printing substrate 106. By adjusting the ink density and the cell volume of the anilox roll 104, the amount of ink transferred onto the printing plate 101 is determined. It is desirable to keep the amount of ink transferred constant.

  As shown in FIG. 1, the transferred ink pattern inspection unit 202 according to the embodiment of the present invention includes an inspection roll 200 and a roll inspection device 201, and starts printing in a state where ink is supplied to the printing plate 101. From the position, the inspection roll 200 contacts the convex portion of the printing plate 101 and rotates in synchronization with the rotation of the plate cylinder 102, and ink is transferred from the printing plate 101 to the peripheral surface of the inspection roll 200 to obtain an ink pattern. It is configured as follows. The transferred ink pattern is subjected to detection of defects and foreign matter by a roll inspection apparatus 201 having an illumination means 203 and an inspection camera 204 installed facing the surface of the inspection roll 200.

  The inspection roll 200 according to the embodiment of the present invention preferably has a smooth surface such as a chrome plating roll, but is not limited to a surface shape or surface material that can be used for inspection of an ink pattern. Absent. In addition, the inspection roll 200 is preferably an outer shape capable of having a circumference and width that can have a surface area equal to or larger than the area of the ink pattern to be transferred, but is not limited thereto.

  The transfer ink pattern inspection unit 202 according to the embodiment of the present invention irradiates the illumination light for inspection from above the inspection roll 200 by the illumination unit 203 and is similarly installed in the vicinity of the inspection roll 200. Thus, the ink pattern formed on the inspection roll 200 is imaged by rotating the inspection roll 200. The inspection camera 204 performs continuous imaging using, for example, a line sensor camera. However, the inspection camera's width direction imaging range is insufficient with respect to the width direction of the inspection roll 200, and the inspection roll is obtained by one imaging. If all of the above ink patterns cannot be imaged, an appropriate configuration may be selected such that two or more inspection cameras are imaged side by side.

  As for the defect detection size, since it is known that foreign matter such as dust of several tens of nm to several tens of μm is not lit, the detection capability corresponding thereto is, for example, a camera capable of detecting 100 nm, but the detection sensitivity is increased. If it is too large, there are adverse effects such as increased false detection and time required for inspection, so it is desirable to select an appropriate detection size in consideration of the product manufacturing environment, the defect size to be detected, the production quantity, etc. .

  Using the captured image, a defect is detected by inspection using a generally used pattern matching method or comparative inspection method, and is recorded as data in the XY coordinate system. The data format is not particularly limited, but a file format (data file format, text file format, CSV file format, etc.) that can be recorded by a general personal computer is preferably used. The recorded contents are desirably recorded, for example, defect position information (X coordinate, Y coordinate), defect size, defect type (white defect, black defect, transmission defect, reflection defect), and the like.

  In the conventional method, a desired ink pattern can be obtained by transferring ink from the anilox roll 104 to the printing plate 101 and further to the printing substrate 106, but at that time, on the convex pattern of the printing plate 101. When there is a chip, a protrusion, or an attached foreign matter, there is a problem in that a printing defect due to the occurrence occurs on all the printed substrates 106 to be printed. Therefore, an ink pattern is formed on the substrate 106 by using the transfer ink pattern inspection means 202 that includes the inspection roll 200 of the present invention and inspects defects generated in the ink pattern transferred onto the inspection roll 200. Before printing, the ink pattern is transferred and formed on the inspection roll 200, and the ink generated due to the chipping or protrusion on the convex pattern of the printing plate 101 or the adhered foreign matter without printing on the substrate 106 to be printed. It becomes possible to detect pattern defects and prevent the occurrence of defective products.

  As shown in FIG. 3, the inspection roll cleaning means 300 according to the embodiment of the present invention includes a liquid storage tank 302 installed so that the lower surface of the inspection roll 200 is immersed in the cleaning liquid stored inside, After the surface of the inspection roll 200 is immersed in the cleaning liquid stored in the liquid storage tank 302 as the roll rotates, the cleaning liquid can be sprayed onto the surface of the inspection roll 200 at a place exposed from the cleaning liquid. A cleaning liquid supply nozzle 303 is provided. The inspection roll drying means 301 includes a drying nozzle 304 arranged so that nitrogen or clean air can be blown against the cleaning liquid sprayed and adhered to the inspection roll 200 by the cleaning liquid supply nozzle 303. The surface of the inspection roll 200 is kept clean by the roll cleaning means 300 and the inspection roll drying means 301. In this embodiment, the inspection roll cleaning unit 300 is configured by the liquid storage tank 302 and the cleaning liquid supply nozzle 303 and the inspection roll drying unit 301 is configured by the drying nozzle 304. However, the present invention is not limited thereto. Instead, any means that can clean the surface of the inspection roll 200 is applicable, and either a configuration without any of the liquid storage tank 302 and the cleaning liquid supply nozzle 303, or a configuration in which another means is added, or another For example, scraping with a doctor or wiping with a cloth may be used. As a result, every printed substrate can be inspected every time before transfer. However, in view of productivity, the frequency of defect inspection using the inspection roll 200 may be reduced as necessary. .

  FIG. 6 shows a method of transferring an ink pattern from a plate in which the printing plate is wound around a plate cylinder to a substrate to be printed. There are a method of transferring the ink 603 from the concave / convex shape upper surface portion 602 of the plate pattern 601 to the printing substrate and a method of transferring the ink 603 from the concave portion 604 of the concave / convex shape bottom surface to the printing substrate.

  In the inspection method in the printing apparatus of the present invention, it is possible to remove the defective portion from a desired location on the substrate to be printed by grasping the coordinate position of the substrate to be printed in advance, and a common transfer between the substrates to be printed. It is possible to avoid producing a product that becomes a defect and becomes a lot-out.

  As a means for capturing the coordinate position of the substrate to be printed in advance, for example, the coordinate position of the design drawing of the substrate to be printed is read in advance as information on the coordinate position on the substrate to be printed by the surface plate position changing mechanism 402 shown in FIG. On the other hand, the surface plate position changing mechanism 402 can be moved from the marking position synchronized with the surface plate position changing mechanism 402 by marking and marking the same position on the printing plate as the substrate to be printed. The distance can be grasped by the roll inspection apparatus 201, and the position can be relatively moved by the moving surface plate 107 so as to be transferred to a desired position on the substrate to be printed.

  Further, the reverse method is also possible, and the defect position can be grasped by reading the coordinate position information of the defect of the printing plate into the surface plate position changing mechanism 402 in advance, and from the marking position synchronized with the substrate to be printed. It is possible to print at the desired position by relatively moving the coordinate position of the defect transfer position, but which method to select depends on the specifications of the substrate to be used and the printing device to be used can do.

  An automated method may be used as a method of relatively moving the defect position on the substrate to be printed. However, in order to obtain a desired pattern position, an inspection camera imaging monitor 401 is provided, and a mechanism that can change the position manually is used. There may be. A mechanism having both of them may be used. Further, the method for avoiding the defect position is not only the coordinate position input, but also the relative position can be moved by grasping the defect position and making a difference in peripheral speed between the plate cylinder 102 and the moving surface plate 107. Is possible.

  FIG. 5 shows an example of the printing result at a desired position when the defect position is relatively moved using the surface plate position changing mechanism 402 and when the defect position is not moved. As shown in FIG. 5, for example, when a transfer defect 503 (defect in which ink was not transferred) on the inspection roll overlaps at a desired pixel position, if there is an inspection mechanism provided in the printing apparatus, the defect By performing the operation 502 when there is a relative movement that removes the position from the pixel, it is possible to prevent a state where there is no ink in the pixel. When this is not used, that is, when there is no relative movement, as shown in 501, the transfer defect 503 on the inspection roll matches the pixel and the coordinate position, and the transfer defect 504 on the substrate to be printed occurs. Further, as a method of avoiding the transfer defect 504 on the substrate to be printed, a desired pattern position is relatively moved by giving a speed difference to the peripheral speed synchronized with the plate cylinder 102 and the moving surface plate 107. Even in this case, an effect equivalent to that in the case of the relative movement 502 can be obtained.

  As described above, the configuration according to the embodiment of the present invention has been described. However, an ink pattern defect generated due to a chip, a protrusion, or an attached foreign matter on the convex pattern of the printing plate by the above-described printing apparatus on the inspection roll. It was shown that the ink pattern can be transferred to the substrate to be printed while avoiding the defect position. The present invention is not limited to polymer organic EL displays, and can be suitably implemented in high-definition patterning technology formed by relief printing, for example, wiring printing with metal ink, printing of colored inks such as color filters, etc. It is.

  The mode for carrying out the invention will be specifically described below with reference to examples. The production of the substrate to be printed, the preparation of the organic light emitting material for forming the organic light emitting layer, and the production of the printing relief plate shown in the 0052 to 0056 stages are common to both the examples and the comparative examples.

(Preparation of printed substrate)
As a substrate to be printed, a thin film transistor that functions as a switching element provided on a support, a planarization layer formed thereabove, and a pixel electrode that is electrically connected to the thin film transistor through a contact hole on the planarization layer An active matrix substrate provided with

  Next, the edge part of the pixel electrode provided on this substrate to be printed was covered, and a partition was formed in a shape to partition the pixel. The partition walls were formed by forming a positive resist ZWD6216-6 manufactured by Nippon Zeon Co., Ltd. on the entire surface of the substrate with a spin coater to a thickness of 2 μm, and then forming the partition walls by photolithography. The pixel size is 120 μm in the long side direction and 35 μm in the short side direction, and the partition between the pixels in the long side direction is 10 μm.

  A poly- (3,4) -ethylenedioxythiophene / polystyrene sulfonic acid (PEDOT / PSS) 1.5 wt% aqueous solution with a film thickness of 100 nm was formed as a hole transport layer on the pixel electrode by spin coating. Further, the PEDOT / PSS thin film thus formed was dried under reduced pressure (5 Pa to 10 Pa) at 100 ° C. for 1 hour to produce a printed substrate.

(Preparation of organic light emitting material for forming organic light emitting layer)
The following organic light emitting materials consisting of three colors of red, green and blue (RGB) were prepared.
Red luminescent ink (R): 1 wt% solution of toluene in polyfluorene derivative Green luminescent ink (G): 1 wt% solution in toluene of polyfluorene derivative Blue luminescent ink (B): 1 wt% solution in toluene of polyfluorene derivative

(Manufacture of letterpress for printing)
In contrast to the above-described photosensitive resin material (positive resist ZWD 6216-6 manufactured by Nippon Zeon Co., Ltd.), a stripe-shaped opening of 25 μm, which is the pixel width of the substrate to be printed, and 125 μm corresponding to the pixel region of the organic electroluminescence display element The resin relief printing plate was exposed using a chromium mask of a synthetic quartz base material on which the light shielding portion was formed as an original plate of the resin relief printing plate and using this chromium mask set in a proximity exposure apparatus. The proximity gap was 100 μm and the exposure dose was 400 mJ / cm ² . After the exposure, a development pattern was obtained by spraying pure water as a developer using a line transport spray developer. In addition, the letterpress for printing was produced for each color of red, blue, and green for preparation of an organic EL display.

(Manufacture of organic EL elements)
<Example 1>
The produced relief printing plate was fixed to the plate cylinder of the printing apparatus of the present invention. Using this and the organic light emitting material, printing was performed on the substrate to be printed using each color plate. The organic light emitting layer was printed so that the red organic light emitting layer, the green organic light emitting layer, and the blue organic light emitting layer were arranged in a stripe shape. After printing for each color, drying was performed in an oven at 130 ° C. for 1 hour. The average film thickness of each color of the formed pattern was 102 nm. After drying, calcium is deposited on the organic light-emitting layer formed by printing by 10 nm vacuum deposition, further silver is deposited by 300 nm vacuum deposition, and finally the glass cap is used for sealing, and then the organic EL of the present invention is used. An element was produced. When the light emission state of this organic EL element was confirmed, the non-light-emitting pixel was confirmed. When the coordinate position of the non-light-emitting pixel and the same coordinate position corresponding to the relief plate are confirmed, the relief plate confirms the lack of 5 μm in the long side direction and 25 μm in the short side direction, and is located at the central portion (60 μm) in the long side direction with respect to the pixel. Confirmed that it is located.

  Using the printing apparatus of the present invention, the letterpress on the printed substrate so that the defect position transferred onto the inspection roll is shifted upward by 60 μm with respect to the printing direction of the printed substrate so that the coordinate position is on the partition wall. When the defect coordinate position was relatively moved and printed, the non-light emitting pixel portion confirmed above emitted light. Further, it was confirmed that the same result was obtained even when printing was performed by moving the letterpress defect coordinate position relative to the substrate to be printed so that the coordinate position was shifted on the partition wall by 60 μm.

  Moreover, when the used inspection roll was washed, dried, and printed again on the inspection roll, there was a defect at the same position, and the chipping of the relief plate was the cause of non-luminous pixels. By printing at the coordinate position relatively moved from the next printing, it was possible to print without damaging the substrate to be printed.

<Example 2>
The organic EL element was produced by the same method using the same relief plate as Example 1, and the non-light emitting pixel was confirmed. When the coordinate position of the non-light emitting pixel and the coordinate position corresponding to the letterpress are confirmed, the letterpress confirms the lack of 5 μm in the long side direction and 25 μm in the short side direction, and is located at the central part (60 μm) in the long side direction with respect to the pixel. I confirmed that

  In contrast, printing was performed at a rotational speed of the plate cylinder of the printing apparatus of the present invention faster than the substrate platen speed on which the substrate to be printed was placed. In the case of this printing, when the organic EL element was produced by moving the letterpress defect coordinate position relatively upward about 60 μm in the printing direction of the non-light emitting pixels with respect to the substrate to be printed and printing the defective portion on the partition wall, The non-light emitting pixel portion emitted light.

  Moreover, when the used inspection roll was washed, dried, and printed again on the inspection roll, there was a defect at the same position, and the chipping of the relief plate was the cause of non-luminous pixels. By printing at the coordinate position relatively moved from the next printing, it was possible to print without damaging the substrate to be printed.

<Example 3>
The organic EL element was produced by the same method using the same relief plate as Example 1, and the non-light emitting pixel was confirmed. When the coordinate position of the non-light emitting pixel and the coordinate position corresponding to the letterpress are confirmed, the letterpress confirms the lack of 5 μm in the long side direction and 25 μm in the short side direction, and is located at the central part (60 μm) in the long side direction with respect to the pixel. I confirmed that

  On the other hand, printing was performed at a rotation speed of the plate cylinder slower than the substrate platen speed on which the substrate to be printed was placed. In the case of this printing, when the defect portion was printed on the partition wall by moving downward relative to the substrate to be printed by about 60 μm in the printing direction of the non-light emitting pixel, the non-light emitting pixel portion emitted light.

  Moreover, when the used inspection roll was washed, dried, and printed again on the inspection roll, there was a defect at the same position, and the chipping of the relief plate was the cause of non-luminous pixels. By printing at the coordinate position relatively moved from the next printing, it was possible to print without damaging the substrate to be printed.

<Comparative Example 1>
The same relief plate used in Examples 1 to 3 was fixed to the plate cylinder of the printing apparatus of the present invention. Further, the inspection roll was removed from the printing apparatus of the present invention. Using the organic light emitting material, the printing apparatus of the present invention performed printing on the substrate to be printed with each color plate. The organic light emitting layer was printed so that the red organic light emitting layer, the green organic light emitting layer, and the blue organic light emitting layer were arranged in a stripe shape. After printing for each color, drying was performed in an oven at 130 ° C. for 1 hour. The average film thickness of each color of the formed pattern was 102 nm. After drying, a calcium film is formed on the organic light-emitting layer formed by printing by vacuum deposition of 10 nm, and then silver is vacuum-deposited by 300 nm, and finally sealing is performed using a glass cap to produce an organic EL element. did. When the light emission state of this organic EL element was confirmed, the non-light-emitting pixel was confirmed. When the coordinate position of the non-light-emitting pixel and the same coordinate position corresponding to the relief plate are confirmed, the relief plate confirms the lack of 5 μm in the long side direction and 25 μm in the short side direction, and is located at the central portion (60 μm) in the long side direction with respect to the pixel. Confirmed that it is located. Further, when the printing was continued, the defect was transferred to the same location, so it was confirmed that the defect due to this position was a cause of non-light emitting pixels.

DESCRIPTION OF SYMBOLS 101 ... Printing plate 102 ... Plate cylinder 103 ... Ink pan 104 ... Anilox roll 105 ... Doctor 106 ... Printed substrate 107 ... Moving surface plate 200 ... Inspection roll 201 ... Roll inspection device 202 ... Transfer ink pattern inspection means 203 ... Illumination means 204 ... Inspection camera 300 ... Inspection roll cleaning means 301 ... Inspection roll drying means 302 ··· Storage tank 303 ··· Cleaning liquid supply nozzle 304 ··· Drying nozzle 401 ··· Inspection camera imaging monitor 402 ··· Surface plate position changing mechanism 403 · · · relative movement coordinates 501 ··· relative 502 with no relative movement 503 with relative movement 503... Transfer defect 504 on inspection roll 504 transfer defect 601 on printing substrate. 602 ... uneven upper surface portion 603 ... ink 604 recess of ... uneven bottom 700 ... support base

Claims (6)

A printing plate, a movable platen on which a printing substrate to which an ink pattern is transferred from the printing plate and a relative position of the printing plate can be adjusted; and the printing plate instead of the printing substrate An inspection roll for transferring and inspecting an ink pattern from the roll, a roll inspection apparatus for inspecting an ink pattern transferred to the inspection roll, a position of the moving surface plate, and the substrate to be printed and the printing plate And a platen position changing mechanism for adjusting the relative position of the printing apparatus,
The roll inspection apparatus has a function of inspecting the presence or absence of defects in the ink pattern transferred to the inspection roll and its position,
In the surface plate position changing mechanism, the coordinate position of the substrate to be printed and the coordinate position of the inspection roll are input in advance in association with each other, and the surface plate position changing mechanism is inspected by the roll inspection apparatus. A printing apparatus having a function of adjusting a relative position between the printing plate and the movable surface plate based on information.   2. The printing according to claim 1, wherein the roll inspection apparatus includes illumination means for illuminating the ink pattern transferred to the inspection roll, and an inspection camera for imaging the ink pattern. apparatus.   The printing apparatus according to claim 1, further comprising an inspection roll cleaning unit and an inspection roll drying unit.   The printing apparatus according to claim 1, wherein the printing plate is a relief plate. A printing method using the printing apparatus according to claim 1,
Transferring an ink pattern from the printing plate to the inspection roll;
Inspecting the presence or absence of defects in the ink pattern transferred to the inspection roll and the position thereof,
When there is a defect in the ink pattern, based on this inspection information, the relative position between the printing plate and the moving surface plate so that the defect is located at a desired position on the substrate to be printed. Adjusting the process,
A printing method comprising: The printing plate is attached to the plate cylinder;
6. The step of adjusting a relative position between a printing plate and a moving surface plate is performed by giving a speed difference between the plate cylinder and the moving surface plate. The printing method as described in.