JP2009104030A - Method of correcting inkjet printed matter and printed matter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of simply and desirably repairing pinhole defects on the partitions, when manufacturing a printed matter at a low cost by printing on a panel whose surface is finely divided with partitions in a simple process by using an inkjet system, and to reduce the manufacturing cost of an inkjet printed matter. <P>SOLUTION: In the method of correcting a printed matter by filling correction ink containing an ink repellent agent in the pinhole defects developed on the partitions during the manufacturing process of an inkjet printed matter, the pinhole defects are corrected by repeating the correction ink application and solidification process while suppressing the widthwise spread of the applied ink from the partitions to the extent not requiring trimming and until the applied ink film becomes thick enough to prevent color mixing. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a method for correcting printed matter produced using an ink ejection device. As an example of the printed matter that is the subject, there is a color filter in which a colored layer is formed using an ink ejection device. Another example of the printed material is an electroluminescent element in which an organic light emitting layer is formed using an ink discharge device. In addition, circuit boards, thin film transistors, microlenses, biochips, and the like can be exemplified as printed matter.
More specifically, the present invention relates to a correction method suitable for correcting a pinhole defect of a partition wall generated in the manufacturing process of these ink discharge printed matter and a corrected ink discharge printed matter.

Various studies have been made on the method for forming a colored layer of a color filter, and a photolithography method, an ink discharge method, and the like are known as typical methods. The pixel pattern formation of the color filter by the photolithographic method forms the coating film of the photosensitive resin layer of each color on the entire substrate, and after the pattern is exposed, the unnecessary portion of the coating film is removed, and the remaining pattern portion is coated. Let the film be each pixel. In this method, a large amount of material is wasted because most of the coating film is developed and removed. Furthermore, since the exposure and development processes are performed for each pixel, the number of processes increases.
This photolithography method is used not only for color filters but also for the manufacture of various optical elements and electrical elements such as electroluminescence elements, but the above-mentioned problem of the photolithography method becomes significant as the substrate becomes larger, Both the cost and the environment became a problem.
As a method for overcoming this problem, a method of manufacturing an optical element by an ink discharge method has recently attracted attention. For example, when a color filter is manufactured by an ink ejection method, resin compositions of three colors R, G, and B can be used as inks, and each color can be printed simultaneously in a single process. For this reason, ink materials such as pigments are hardly wasted, and at the same time, the formation process of the three-color pixels is shortened, so that a reduction in environmental burden and a significant cost reduction can be expected.

  As described above, since the ink ejection method can simplify the manufacturing process and reduce the cost, it is applied to the manufacture of optical elements such as color filters and electroluminescence elements. However, there is a problem of “color mixing” as a problem of the ink ejection method. Hereinafter, a case where a color filter is manufactured will be described as an example.

  “Mixed color” is a defect in which inks are mixed between adjacent pixels and colored inks of different colors are mixed. Color mixing occurs when the discharged ink overflows beyond the partition wall. In order to solve this problem, methods described in Patent Documents 1 to 5 have been proposed as a method of manufacturing a color filter substrate using an ink ejection method. In Patent Documents 1 to 5, a black resin layer containing an ink repellent agent such as a fluorine-containing compound is formed by a photolithography method or the like in order to prevent ink bleeding and color mixing in the ink ejection process of the ink. It is described to do.

  In recent years, it has become difficult to manufacture a color filter without any defects due to an increase in dust and foreign matter in the color filter surface as the substrate becomes larger. Therefore, it has become important to correct pinhole defects generated in the color filter to improve the quality and reduce the overall manufacturing cost.

In particular, the ink ejection method has a problem that even if an ink repellent agent is added to the partition wall, if a pinhole defect occurs in the partition wall, a “color mixing” defect occurs, resulting in a defective product.

  For this reason, when a pinhole defect has conventionally occurred in the partition wall, the pinhole defect portion has been individually corrected. However, in areas corrected with normal correction ink that does not contain ink repellent (hereinafter referred to as repair ink), ink repellency with respect to the color ink to be filled later is insufficient, and even if corrected, a "color mixing" defect still occurs. The problem that many cases remained. Therefore, it is necessary to add an ink repellent agent for preventing color mixing to the repair ink used for the pinhole defect of the partition wall.

However, the method of correcting a pinhole defect using a repair ink to which an ink repellent is added has the following problems as compared with the case of correcting using a normal ink. That is, the repair ink containing an ink repellent agent has a low surface tension and is easy to be leveled, so that it requires a large number of times of application until the height of the partition wall, and the efficiency for correction is lowered. Further, in order to prevent “color mixing”, it is difficult to make the ink repellency of the corrected portion equal to that of the peripheral normal partition wall.
As a method for correcting the partition pinhole, a needle method, a dispense method, a thermal transfer method, an ink ejection printing method, and the like are known.
By correction method, if you try to correct with the dispensing method or ink ejection printing method, the ink repellent agent is likely to be clogged or non-ejection, and with the thermal transfer method, you must create a new thermal transfer sheet with ink repellent components. There was a problem of not becoming.
In this respect, the needle method was less problematic than other methods, but even in this method, as described above, when an ink repellent was added, the surface tension decreased, and a sufficient amount of ink was placed at the tip of the needle. Therefore, there remains a problem that a large number of coatings are required, and correction cannot be performed efficiently.

In addition, it was necessary to shape the portion that was applied beyond the width of the partition wall within the width of the partition wall by applying ultraviolet or infrared laser light after applying and solidifying the repair ink.
The repair ink material removed by this laser irradiation adheres to the vicinity of the irradiated area, resulting in a foreign matter or residue, causing defects, or by adhering to the partition wall surface, resulting in a decrease in ink repellency. In some cases, the “color mixing” defect occurred and the correction failed. As described above, in the correction of the partition wall pinhole defect, it has been difficult to prevent “color mixing” with the conventional proposal.
JP-A-6-347637 JP-A-7-35915 Japanese Patent Laid-Open No. 7-35916 JP 7-35917 A JP-A-9-203803

  In view of the above problems, the present invention is capable of accurately repairing pinhole defects generated in the partition walls and preventing subsequent color mixing when producing printed matter at low cost by a simple process using an ink ejection method. It is an object of the present invention to provide a method for correcting an ink discharge printed matter.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. The invention according to claim 1 is directed to a substrate, a partition wall that divides the surface of the substrate into a number of regions, and an ink ejection function in the number of regions. In a correction method for a printed matter, a pinhole defect generated in the partition wall of an ink discharge printed matter having an ink film formed by discharge using an apparatus is corrected by covering the pinhole defect portion with a repair ink containing an ink repellent agent. The method for correcting an ink-discharge printed matter is characterized by comprising at least a step of applying a repair ink and a step of solidifying the ink with heat or ultraviolet light, wherein the steps of applying and solidifying are at least twice.

  According to a second aspect of the present invention, there is provided a method for correcting an ink-discharge printed matter, wherein a predetermined time between the application of the repair ink and the solidification is not less than 3 seconds and not more than 30 seconds.

  The invention described in claim 3 is characterized in that the amount of the repair ink to be applied at one time is 10 to 30 μl, and the laser trimming of the portion wider than the width of the partition wall after application of the repair ink is unnecessary. This is a method for correcting an ink ejection printed matter.

  The invention according to claim 4 is that the repair ink is composed of at least a resin composition and an ink repellent, and the ink repellent is contained in an amount of 0.01 wt% to 10 wt% with respect to the resin composition. It is the correction method of the ink discharge printed matter characterized.

  The invention according to claim 5 is a method for correcting an ink-discharge printed matter, wherein the viscosity of the repair ink is 30 to 120 mPa · s.

  The invention according to claim 6 is a method for correcting an ink-discharge printed matter, wherein the partition is a light shielding layer.

  The invention according to claim 7 is a color filter in which the substrate is a transparent substrate, the ink film layer is a layer formed of an ink containing a colorant, and the printed matter includes a plurality of colored layers. This is a method for correcting an ink ejection printed matter.

  In the invention according to claim 8, the substrate is a transparent substrate, the ink film layer is an organic light emitting layer formed of an ink containing an organic light emitting material, and the printed matter includes a plurality of colors of organic light emitting layers. It is an organic electroluminescent element, and is a correction method of the ink discharge printed matter characterized by the above-mentioned.

  The invention according to claim 9 is an ink ejection printed matter comprising: a substrate; a partition that divides the surface of the substrate into a plurality of regions; and an ink film that is ejected and formed in the many regions using an ink ejection device. The ink according to any one of claims 1 to 8, wherein the pinhole defect generated in the partition wall is corrected by covering the pinhole defect portion with a repair ink containing an ink repellent agent. The present invention provides an ink-discharge printed matter using a method for correcting a discharge printed matter.

  According to the present invention, it is possible to accurately correct a pinhole defect generated in the partition wall, and at the same time, it is possible to prevent a color mixing defect in which ink is mixed between adjacent pixels in the corrected printed matter. This makes it possible to easily and satisfactorily repair pinhole defects generated in the partition walls when manufacturing printed materials at low cost with a simple process using an ink ejection method, and to reduce the manufacturing cost. We were able to provide a fix.

Hereinafter, preferred embodiments of the present invention will be described.
In addition, the printed matter according to the present invention can be suitably used as an optical component constituting a display screen of a display. In this case, the multiple areas correspond to pixels constituting the display screen. In addition, a black light shielding member can be mixed in the partition wall so as to have a function as a light shielding layer. Examples of the optical component include a color filter constituting a display screen of a color liquid crystal display. In this case, the ink film constitutes a colored layer for coloring transmitted light. This colored layer is of a plurality of colors having different colors for each region. Moreover, an organic electroluminescent element can also be illustrated as another optical component. In this case, the ink film constitutes an organic light emitting material layer. The ink film is a multi-color organic light emitting material layer having a different color for each of the multiple regions. In addition, examples of the application field of the printed matter according to the present invention include circuit boards, thin film transistors, microlenses, biochips, and the like.

  The substrate according to the present invention is used as a support substrate for printed matter. For example, when a color filter constituting a display screen of a color liquid crystal display is manufactured as a printed material, a known transparent substrate material such as a glass substrate, a quartz substrate, a plastic substrate, or a dry film can be used. Among these, a glass substrate is preferably used because it is excellent in transparency, strength, heat resistance, and weather resistance.

The partition of this invention is comprised with the material which has the ink repellency with respect to the ink discharged by an ink discharge printing apparatus. This ink repellency is necessary to divide the surface of the substrate into a large number of regions and to provide a function for preventing color mixing of the ink ejected in each of the large numbers of regions.
Further, when the printed material is an optical component that constitutes the display screen of the display, the contrast of the display screen can be improved by providing light shielding to the partition walls. The partition walls are formed from a partition wall resin composition containing a resin binder, an ink repellent, a black shielding member, and the like by a photolithography method, a printing method, or the like.

  The resin binder fixes and fixes the partition wall to the substrate, and imparts ink resistance to the partition wall. As the binder resin, a resin containing an amino group, an amide group, a carboxyl group, or a hydroxyl group is preferable. Specifically, a cresol-novolak resin, a polyvinylphenol resin, an acrylic resin, a methacrylic resin, and the like can be given. These resin binders may be used alone or in combination of two or more.

The ink repellent agent imparts ink repellency to the partition walls with respect to the ink ejected by the ink ejection printing apparatus. As the ink repellent agent, a polymer compound having a portion exhibiting compatibility with a resin binder and a portion having ink repellency is used. For example, a block copolymer having a block having compatibility with a resin binder in the molecule and a block having ink repellency can be used as the ink repellent agent. Such an ink repellent agent having both parts migrates to the partition wall surface over time or by heating. Then, the portion having compatibility with the resin binder is set on the inside, and the portion having ink repellency is set on the outside, so that it remains on the partition wall surface, and an optimum critical surface tension is applied to the surface.
As the site having the ink repellency of the ink repellent agent, a fluoroalkyl group can be used, and it is more preferable to use a perfluoroalkyl group. As a site showing compatibility with the resin binder, a known polymer having a lipophilic group such as an alkyl group or an alkylene group can be used.

In addition, as the ink repellent agent, a fluorine-containing compound or a silicon-containing compound described later can be used at the same time. Specific examples of the fluorine-containing compound include polymers of vinylidene fluoride, vinyl fluoride, ethylene trifluoride, and fluororesins such as copolymers thereof. These fluorine-containing compounds can be used alone or in combination of two or more.
Examples of the silicon-containing compound include silicone resins and silicone rubbers containing a siloxane component in the main chain or side chain. These silicon-containing compounds can be used alone or in combination of two or more. Furthermore, you may use together the said fluorine-containing compound, a silicon-containing compound, or another ink repellent agent. The content of the ink repellent agent is preferably 0.01% by weight to 10% by weight with respect to the partition wall resin composition. If the amount of the ink repellent is too large, white spots occur. Here, the white spot is a defect that occurs mainly because the applied ink cannot be sufficiently and uniformly diffused in the region surrounded by the partition walls, and the printed matter is a color filter. Is a defect that causes a display defect such as color unevenness or a decrease in contrast. White spots occur when the ink repellent oozes from the side surface of the partition wall.
In addition, the black light shielding member imparts light shielding properties to the partition walls and improves the contrast of the display screen. As the black light shielding member, black pigments such as carbon black, black dyes such as aniline black, other inorganic pigments, and organic pigments can be used. These black light shielding members may be used alone or in combination of two or more.

  Moreover, the partition resin composition can be used by diluting with an appropriate solvent as required. Specific examples of the solvent include dichloromethane, dichloroethane, chloroform, acetone, cyclohexanone, ethyl acetate, 2-methoxyethanol, 2-ethoxyethanol, 2-butoxyethanol, 2-ethylethoxyacetate, 2-butoxyethyl acetate, 2-methoxyethyl ether, 2-ethoxyethyl ether, 2- (2-ethoxyethoxy) ethanol, 2- (2-butoxyethoxy) ethanol, 2- (2′ethoxyethoxy) ethyl acetate, 2- (2-butoxyethoxy) ) Ethyl acetate, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, diethylene glycol dimethyl ether, tetrahydrofuran and the like can be used. The amount of the solvent used is desirably an amount that is uniform when printed or coated on a substrate and that can form a coating film without pinholes and uneven coating. As a content ratio of such a solvent, it is preferable to prepare such that the solvent amount is 50 to 97% by weight with respect to the total weight of the resin composition.

In addition, additives such as a leveling agent, a chain transfer agent, a stabilizer, a sensitizing dye, a surfactant, and a coupling agent can be added to the partition wall resin composition as necessary. The partition wall can be formed by using a partition wall resin composition by a method such as a printing method, a photolithography method, or a transfer method.
When the partition is formed by photolithography, a photosensitive resin composition in which a monomer and a photopolymerization initiator are added to the resin composition is used.

As a monomer applied to the photosensitive resin composition, a monomer or oligomer having a vinyl group or an allyl group can be used. Specifically, (meth) acrylic acid and salts thereof, (meth) acrylic acid esters, (meth) acrylamides, maleic anhydride, maleic acid esters, itaconic acid esters, styrenes, vinyl ethers, vinyl esters, N -Vinyl heterocycles, allyl ethers, allyl esters, and derivatives thereof.
These monomers may be used alone or in combination of two or more. The amount of the monomer can be in the range of 1 to 200 parts by weight, preferably 50 to 150 parts by weight, based on 100 parts by weight of the resin binder.

Examples of the photopolymerization initiator include benzophenone compounds such as benzophenone, 4,4′-bis (dimethylamino) benzophenone, and 4,4′-bis (diethylamino) benzophenone. Further, acetophenone derivatives, thioxanthone derivatives, anthraquinone derivatives, and benzoin ether derivatives may be used. Further, acylphosphine derivatives such as phenylbis- (2,4,6-trimethylbenzoyl) -phosphine oxide, 2- (o-chlorophenyl) -4,5-bis (4′-methylphenyl) imidazolyl dimer Lophine multimers such as N-arylglycine such as N-phenylglycine, organic azides such as 4,4′-diazidochalcone, 3,3 ′, 4,4′-tetra (tert-butylperoxycarboxyl) Examples include benzophenone and quinonediazide group-containing compounds.
These photopolymerization initiators may be used alone or in combination of two or more. The quantity of a photoinitiator can take the range of 0.1-50 weight part with respect to 100 weight part of resin binders, Preferably it is 1-20 weight part.
<Partition wall formation by photolithography>
A case where the partition walls are formed by photolithography will be described. The photosensitive resin composition is applied onto the substrate using a spin coater, a slit coater or the like. The photosensitive resin composition is roughly classified into a positive type and a negative type, and in the case of a negative type photosensitive resin composition, it includes a resin binder, a monomer, a photopolymerization initiator, and the ink repellent. In the case of a positive photosensitive resin composition, the positive photosensitive resin and the ink repellent agent are included. If necessary, these photosensitive resin compositions may further contain a crosslinking agent, a black shielding member, a pigment, the additive, and the like.
Then, the board | substrate with which the photosensitive resin composition was apply | coated to one side is exposed using the mask of a partition pattern. The substrate is developed with a developing solution to remove unnecessary photosensitive resin composition, and partition walls are formed on the substrate. Thereafter, the partition walls are heated at 100 to 250 ° C. for about 3 to 60 minutes.
<Correction of pinhole defects generated in partition walls>
An ink discharge printed matter is formed by forming an ink film on the surface of the substrate in an area separated by the partition formed by the above method using an ink discharge device. When there is a hole defect, a “mixed color” defect occurs in which ink is mixed between adjacent pixels. Further, even if the pinhole defect is corrected, color mixing occurs when the ink repellency is insufficient in the corrected portion, or when the correction is incomplete and a small defect remains. The color mixture will be described with reference to FIGS.
FIG. 1 is an explanatory view showing an example of a pinhole defect state of a color filter partition wall. The left figure is an explanatory view seen from the plane, and the right figure is the explanatory view seen from the side. FIG. 1 shows a substrate 10, a partition wall 11 formed on the substrate 10, and pinhole defects 30 generated in the partition wall 11.

FIG. 2A is an explanatory view showing a correction state before laser shaping of the color filter partition walls by a conventional repair method, and shows a state where the pinhole defect 30 of FIG.
Repair inks containing ink repellents have low surface tension and are easy to level, so a large number of coatings are required to reach the height of the partition wall, or a large amount of coating is required at one time. The expansion is larger than the width of the partition wall.

  FIG. 2B is an explanatory diagram showing a correction state after laser shaping of the color filter partition walls by a conventional repair method. A state in which the portion 32 that is wider than the width of the partition wall after spot-solidifying the repair ink is irradiated with ultraviolet to infrared laser light and trimmed to the width of the partition wall is shown.

  FIG. 3 includes a step of applying a repair ink and a step of solidifying the ink with heat or ultraviolet light, and repeating the coating and solidifying step at least twice or more, the pinhole of the partition wall of the color filter is formed by the correction method of the present invention. It is explanatory drawing which showed the example of the corrected state. After the first minimum amount of repair ink is applied to the correction portion 32 shown in FIG. 3, the ultraviolet light or halogen lamp is irradiated to solidify the ink by spot solidification, and then the second repair ink is applied and spotted again. The pinhole is corrected by the solidification method.

  In this method, a required waiting time is required for spot solidification after each application of repair ink.

Since the second repair ink is applied onto the dried first repair ink having a low surface tension, a phenomenon of spreading larger than the width of the partition wall as shown in FIG. 2a is not seen. Since the second coating of the repair ink is difficult to level and the film thickness is high, the coating can be easily made higher than the partition wall by the two coatings, and can be corrected efficiently. Further, since the repair ink 32 does not protrude beyond the width of the partition wall, trimming and shaping to the width of the partition wall by irradiating with ultraviolet to infrared laser light can be omitted.

FIG. 4 is an explanatory view showing a state in which a colored layer is formed after correcting the pinhole defect of the partition wall of the color filter. The state which colored ink 12 was patterned on the board | substrate corrected with the correction method of this invention using the ink discharge printing apparatus is shown. Since the corrected portion shows a sufficient film thickness and sufficient ink repellency, no color mixing occurs.
FIG. 5 is an explanatory view showing a state in which a colored layer is formed without correcting the partition walls of the color filter. A state of color mixture that occurs when the pinhole defect 30 of FIG. 1 is not corrected is shown. A state in which color mixing occurs due to leakage of colored ink at 33 locations in a state where the colored ink 12 is patterned on the substrate using an ink discharge printing apparatus is shown.
<Specific means for correction>
Hereinafter, an example of a specific process of the correction in the correction method of the ink ejection printed matter of the present invention will be described. Correction of the pinhole defect generated in the partition wall is performed by first finding the pinhole defect. A pinhole in the partition wall is detected using an optical inspection machine attached to the partition wall production line. Defect detection by an optical inspection machine is performed by irradiating inspection light from the upper surface on which the partition wall is formed, receiving reflected light and transmitted light with the CCD camera, and scanning the entire object, while receiving signals from the CCD camera. The intensity is implemented by comparative analysis for each pattern. Then, the position and size of the found pinhole defects are classified and collated with the standard, and the position information of the defects that are defective is recorded. Thereafter, the defect of the recorded pinhole position is corrected.
First, the pinhole defect portion is irradiated with laser light from the infrared region to the ultraviolet region before correction, and the pinhole defect portion is adjusted to a size that can be easily corrected. Laser irradiation may be performed as necessary, and ink can be directly applied and corrected without performing laser irradiation on the pinhole defect portion.
As a method for correcting the pinhole defect, any known method such as a needle method, a dispensing method, and an ink ejection printing method can be used. Here, a case where a needle method is used will be described as an example. In the needle method, repair ink is attached to the tip of the needle, and this is transferred to a pinhole defect portion to fill the pinhole.
For example, using a needle having a diameter of 30 μm, after the first application (about 20 μl), an ultraviolet lamp or a halogen lamp is irradiated to solidify the spot. Next, the second coating operation is performed in the same manner as the first time. Every time, there is a required waiting time until spot solidification after coating.
During the required waiting time, the ink repellent component in the repair ink moves to the surface, and as a result, the ink repellency of the partition wall surface is improved.
In the second application, the repair ink is applied onto the solidified first repair ink, and therefore, it is difficult to level, and a phenomenon of spreading larger than the width of the partition wall is not observed. The coating can be easily raised to a height higher than the partition wall by applying twice, and correction can be performed efficiently. Further, since it does not protrude beyond the width of the partition wall, trimming and shaping to the width of the partition wall by irradiating ultraviolet to infrared laser light can be omitted.

In the present invention, the ink (repair ink) used for correction satisfies the following composition. The repair ink contains at least a resin binder and an ink repellent. When the printed material is an optical component that constitutes the display screen of the display, it is necessary to improve the contrast of the display screen by including a black shielding member or the like in order to impart light shielding properties.
As the resin binder of the repair ink, a resin containing an amino group, an amide group, a carboxyl group, or a hydroxyl group is preferable. Specifically, a cresol-novolak resin, a polyvinylphenol resin, an acrylic resin, a methacrylic resin, and the like can be given. These resin binders may be used alone or in combination of two or more.
As the ink repellent agent of the repair ink, a polymer compound (ink repellent compound) having a portion exhibiting compatibility with a resin binder and a portion having ink repellency is used. For example, a block copolymer having a block showing compatibility with a resin binder and a block having ink repellency can be used as the ink repellent compound.
Such an ink repellent agent having both sites moves to the repair site surface over time or by heating. And the site | part which shows compatibility with a resin binder is made into an inside, the site | part which has ink repellency is made into the outside, it stops at a repair site | part surface, and the optimal critical surface tension is provided to the surface.
As the site having the ink repellency of the ink repellent agent, a fluoroalkyl group can be used, and it is more preferable to use a perfluoroalkyl group. As a site showing compatibility with the resin binder, a known polymer having a lipophilic group such as an alkyl group or an alkylene group can be used.

As the ink repellent agent, a fluorine-containing compound or a silicon-containing compound described later can be used at the same time. Specific examples of the fluorine-containing compound include vinylidene fluoride, vinyl fluoride, ethylene trifluoride and the like, and fluorinated resins such as copolymers thereof. These fluorine-containing compounds can be used alone or in combination of two or more. Examples of the silicon-containing compound include silicone resins and silicone rubbers containing a siloxane component in the main chain or side chain. These silicon-containing compounds can be used alone or in combination of two or more. Furthermore, you may use together the said fluorine-containing compound, a silicon-containing compound, or another ink repellent agent. The content of the ink repellent agent is preferably 0.01% by weight to 10% by weight with respect to the resin composition.
Further, the viscosity of the repair ink used for the correction of the present invention is preferably 30 to 120 mPa · s. If it is 30 mPa · s or less or 120 mPa · s or more, a sufficient amount of ink does not adhere to the tip of the needle, so that the amount of ink applied at one time decreases and the correction efficiency decreases.
The viscosity of the repair ink is the optimum viscosity when the needle method is used as the correction method, and the optimum viscosity varies depending on the correction method.
<Ink film formation by ink ejection device>
After correcting the pinhole defect generated in the partition on the substrate by the method as described above, ink is ejected to the opening of the partition using an ink ejection device to form an ink film.
As an ink discharge device, there are a piezo conversion method and a heat conversion method depending on the discharge method, and the piezo conversion method is particularly preferable. It is preferable to use an apparatus in which the ink particleization frequency is about 5 to 100 KHz, the nozzle diameter is about 5 to 80 μm, a plurality of heads are arranged, and a number of nozzles are incorporated in one head. In addition, a known ink discharge device can be used. After the ink film is formed, the ink solvent can be dried and cured as necessary by heating.

Hereinafter, a correction method in the case of using a color filter as an example of an ink-discharge printed matter will be described in detail for one of the embodiments of the present invention.
<Preparation of partition wall resin composition>
<Preparation of photosensitive resin composition for black matrix>
The following components were mixed at the following ratios to obtain a photosensitive resin composition.
Cresol-novolak resin; EP4050G (Asahi Organic Chemicals Co., Ltd.) 100 g Compound having unsaturated double bond; Pentaerythritol tetraacrylate 1.65 g photopolymerization initiator; Oxime photopolymerization initiator (CGI-124 manufactured by Ciba Specialty Chemicals) 4.95 g dispersant; Solsperse # 5000 (manufactured by Zeneca) 0.9 g carbon pigment; MA-8 (manufactured by Mitsubishi Materials) 90 g solvent; propylene glycol monoethyl ether acetate 201 g leveling agent; BYK-330 (manufactured by BYK Chemie) ) 0.003 g Further, to this photosensitive resin composition, an ink repellent agent “Megafac 350C” (manufactured by Dainippon Ink Chemical Co., Ltd.) is added to the total solid weight (the weight of the solvent and the dispersant in the photosensitive resin composition). Added at a rate of 0.2 wt% with respect to the total weight removed) The photosensitive resin composition used for formation of a partition was produced.
<Creation of black matrix>
Using a non-alkali glass (“# 1737” manufactured by Corning) as a substrate, the black matrix (partition) photosensitive resin composition prepared by the above method was applied on the entire surface in a thin film.

Thereafter, using a photomask having a lattice pattern, exposure was performed at 50 mJ / cm 2 with an ultrahigh pressure mercury lamp. Development processing was performed with a 10% aqueous sodium carbonate solution for 30 seconds to form a partition pattern of the resin composition. The substrate was placed in an oven and subjected to thermosetting at 180 ° C. for 10 minutes to form partition walls on the substrate.
<Preparation of repair ink>
The following components were mixed at the following ratios to obtain a photosensitive resin composition.
Cresol-novolak resin; EP4050G (Asahi Organic Chemicals Co., Ltd.) 100 g Compound having unsaturated double bond; Pentaerythritol tetraacrylate 1.65 g photopolymerization initiator; Oxime photopolymerization initiator (CGI-124 manufactured by Ciba Specialty Chemicals) 4.95 g dispersant; Solsperse # 5000 (manufactured by Zeneca) 0.9 g carbon pigment; MA-8 (manufactured by Mitsubishi Materials) 90 g solvent; propylene glycol monoethyl ether acetate 201 g leveling agent; BYK-330 (manufactured by BYK Chemie) ) 0.003 g Further, to this photosensitive resin composition, an ink repellent agent “Megafac 350C” (manufactured by Dainippon Ink Chemical Co., Ltd.) is added to the total solid weight (the weight of the solvent and the dispersant in the photosensitive resin composition). Added at a rate of 0.2 wt% with respect to the total weight removed) A photosensitive resin composition used for correcting the pinhole of the partition wall was prepared. The viscosity of the thus prepared repair ink was measured using an E-type viscometer, and found to be 98 mPa · s. In addition, if the ink repellent contained in the partition wall resin composition used for forming the partition and the ink repellent of the correction ink are the same or have similar properties, the effect on the ink repellency of the partition before and after the correction Is preferable because of a small amount.
<Correction of pinhole defects generated in partition walls>
The pinhole defect of the partition wall pattern formed on the substrate by the above method was detected by an optical inspection device, and the position data was recorded. After that, in order to arrange the pinhole defect portion into a shape that can be more easily corrected, the pinhole defect of the partition wall is irradiated with third harmonic YAG laser light (wavelength 355 nm, 2 mJ / pulse, manufactured by HOYA), and pinned to a 50 μm square. The hole defect was shaped.
The first application (about 20 μl) was performed using a 30 μm diameter application needle. After having a waiting time of 5 seconds after coating, simple solidification was performed with a halogen lamp for 5 seconds. As the second application, the same operation as the first application was performed. It was confirmed that the film thickness height of the corrected portion was equal to or higher than the height of the surrounding partition wall by two coatings. It was noted that the film thickness was suppressed to 150% or less compared with the peripheral part in order to avoid an extremely high film thickness. The solidified substrate was placed in an oven and heated at 180 ° C. for 15 minutes, and the repair ink was thermally cured to complete the correction of pinhole defects generated in the partition walls.
<Adjustment of colored ink>
The following components were mixed, 0.75 parts by weight of azobisisobutylnitrile was added under a nitrogen atmosphere, and an acrylic copolymer resin was obtained by reaction at 70 ° C. for 5 hours.
Methacrylic acid 20 parts by weight Methyl methacrylate 10 parts by weight Butyl methacrylate 55 parts by weight Hydroxyethyl methacrylate 15 parts by weight Butyl lactate 300 parts by weight Propylene glycol monomethyl ether acetate so that the resulting acrylic copolymer resin has a resin concentration of 10% by weight To obtain a diluted solution of acrylic copolymer resin.

  19.0 g of pigment and 0.9 g of polyoxyethylene alkyl ether as a dispersant were added to 80.1 g of this diluted solution, and kneaded with three rolls to obtain red, green and blue colored varnishes. . Pigment red 177 was used as a red pigment, Pigment Green 36 as a green pigment, and Pigment Blue 15 as a blue pigment.

Propylene glycol monomethyl ether acetate was added and adjusted so that the pigment concentration of each colored varnish obtained was 12 to 15% by weight and the viscosity was 15 mPa · s to obtain red, green and blue colored inks. .
<Ink film formation by ink ejection device>
Ink ejection apparatus using red, green and blue colored inks for the black matrix opening provided on the substrate on which the correction of the pinhole defect has been completed, and equipped with an ejection amount of 12 pl and a pitch of 180 dpi. The colored ink was ejected to form red (R), green (G), and blue (B) colored layers.
In this manner, the formed colored layer could obtain a good color filter without causing “color mixing” in which inks were mixed between adjacent pixels.
In addition, although the correction method at the time of taking a color filter as an example as an ink discharge printed matter was demonstrated in the Example, the application range of this invention is not limited to this. The present invention can also be applied to uses such as organic electroluminescence elements, circuit boards, thin film transistors, microlenses, and biochips.

As described above, according to the present invention, when a printed matter is manufactured at a low cost by a simple process using an ink ejection method, a pinhole defect generated in a partition wall is repaired multiple times with a repair ink containing an ink repellent agent. By applying and solidifying and correcting pinhole defects, color mixing defects could be prevented.
In addition, according to the present invention, it is possible to cope with an increase in defects due to an increase in the size of a substrate such as a color filter with a high correction capability. It was possible to provide a correction method that could be reduced.

<Comparative example>
Using the materials described in the examples as they are, the color mixture evaluation and the white spot evaluation when the amount of the repair ink applied and the predetermined time (waiting time) during the transfer to the solidification after application of the repair ink are changed are < Table 1> shows. Under conditions where the coating amount was larger than 30 μl, the repair ink applied more than necessary propagated around the cell in the repair area, resulting in “white spots” defects. (Comparative Example 1)
After applying the repair ink, the spot drying immediately after 0 seconds, instead of the waiting time until solidification, solidified before the ink repellent agent floated on the surface, resulting in insufficient ink repellency, resulting in poor “color mixing” There has occurred. (Comparative Example 2)

It is explanatory drawing which showed the example of the pinhole defect state of the partition of a color filter (the left figure was seen from the plane, the right figure was seen from the side). (A) It is explanatory drawing which showed the correction state (conventional repair method; before laser shaping) of the partition of a color filter. (B) It is explanatory drawing which showed the correction state (conventional repair method; after laser shaping) of the partition of a color filter. It is explanatory drawing which showed the correction state (the repair method of this invention; no laser shaping) of the partition of a color filter. It is explanatory drawing which showed the state which formed the colored layer after correcting the pinhole defect of the partition of a color filter. It is explanatory drawing which showed the state which formed the colored layer, without correcting the partition of a color filter.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Color filter 10 ... Glass substrate 11 ... Partition 12 ... Colored layer 30 ... Pinhole defect 32 ... Repair ink 33 ... Color mixing failure

Claims (9)

  Occurs in the partition during the manufacturing process of an ink discharge printed matter having a substrate, a partition that divides the surface of the substrate into a plurality of regions, and an ink film that is formed and discharged in the plurality of regions using an ink discharge device. In a method for correcting a printed matter in which the pinhole defect is corrected by covering the pinhole defect with a repair ink containing an ink repellent agent, at least the step of applying the repair ink and the step of solidifying the ink with heat or ultraviolet light And a method of correcting an ink-discharge printed matter, wherein the step of applying and solidifying is repeated at least twice.   The method for correcting an ink ejection printed matter according to claim 1, wherein the predetermined time between the application of the repair ink and the solidification is 3 seconds or more and 30 seconds or less.   The amount of the repair ink to be applied at one time is 10 to 30 μl, and laser trimming of a portion wider than the width of the partition wall after application of the repair ink is unnecessary. The correction method of the ink discharge printed matter as described.   2. The repair ink according to claim 1, wherein the repair ink includes at least a resin composition and an ink repellent, and the ink repellent is contained in an amount of 0.01 wt% to 10 wt% with respect to the resin composition. Correction method for ink-discharged printed matter.   The method for correcting an ink-discharge printed matter according to claim 1, wherein the repair ink has a viscosity of 30 to 120 mPa · s. The method for correcting an ink ejection printed matter according to any one of claims 1 to 5, wherein the partition wall is a light shielding layer. The substrate is a transparent substrate, the ink film layer is a layer formed of an ink containing a colorant, and the printed material is a color filter having a plurality of colored layers. 7. The method for correcting an ink ejection printed matter according to any one of 6 above. The substrate is a transparent substrate, the ink film layer is an organic light emitting layer formed of an ink containing an organic light emitting material, and the printed matter is an organic electroluminescent element provided with a plurality of colors of organic light emitting layers. The method for correcting an ink-discharge printed matter according to any one of claims 1 to 7.   A pinhole generated in the partition in an ink discharge printed matter having a substrate, a partition that divides the surface of the substrate into a plurality of regions, and an ink film that is formed and discharged in the plurality of regions using an ink discharge device The method for correcting an ink-discharge printed matter according to any one of claims 1 to 8, as a method for correcting a printed matter in which a defect is covered with a repair ink containing an ink repellent agent to correct the pinhole defect portion. Ink-discharge printed matter.

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