JP2009294401A - Method of manufacturing color filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a color filter, by which a flat color layer can be easily formed using an inkjet method. <P>SOLUTION: A color filter is manufactured by forming a black matrix 2a for a color filter on a substrate 1, forming a removable barrier wall 2b in the same pattern by a print method on the black matrix 2a, injecting ink into pixels enclosed by the barrier wall 2b to a height not exceeding the barrier wall 2b by an inkjet method to form a flat color layer, and removing the barrier wall 2b. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a color filter having excellent planarity of a colored layer by an inkjet method.

As a manufacturing method of a color filter used for performing color display with a liquid crystal display element, a pigment dispersion method is mainly used.
The pigment dispersion method has a problem that the process is complicated by using an expensive photoresist or applying, exposing, and developing the photoresist.
Therefore, a method of forming a color pattern on a transparent substrate by an ink jet method with simple equipment and high utilization efficiency of raw materials can be considered. However, when ink-jet drawing is performed on a non-absorbing plastic or glass substrate, color mixture between pixels tends to occur due to wet spreading of the drawn ink. Therefore, usually, partition walls are provided between the pixels, and ink jet drawing is performed in the pixels partitioned by the partition walls. However, in order to keep the inkjet drawing surface smooth, it is necessary to make the height of the drawing surface lower than the height of the partition wall, and there is a problem that a large level difference occurs between the ink drawing surface and the partition wall after drying and curing. Further, when drawing is performed at a height higher than the partition wall so as not to cause a step, color mixing due to the ink getting over the partition wall becomes a problem. In order to prevent this, when the partition walls are liquefied, there is a problem that the surface shape of the ink-jet drawing surface raised in a convex shape between the partition walls is maintained as it is after the ink is dried and cured, and a smooth surface cannot be obtained. In order to solve these problems, the following methods have been proposed.

  Patent Document 1 describes an invention in which a pattern is formed by an inkjet method on a substrate provided with a black matrix light shielding layer. In this invention, ink containing a hot melt material is heated and melted, a pattern is formed using inkjet, and the substrate after pattern formation is heated to re-dissolve the ink, and the surface tension of the ink is used to flatten the surface. I am trying. In the method of the present invention, since it is essential to contain a hot melt substance, there are problems that it is difficult to obtain a high-concentration ink and heat resistance is low.

  Patent Document 2 describes an invention that forms a smooth pixel by curing ink jet ink using heat drying and photocuring together. This method has a problem that the flattening state changes depending on conditions such as the timing of photocuring and the irradiation direction.

  Patent Document 3 describes an invention in which a flat color filter is manufactured by producing a photoresist from which a partition wall can be removed and controlling the amount of color ink applied to a portion surrounded by the partition wall. This method requires complicated steps of forming and removing partition walls using a positive photoresist and forming a black matrix using a black resist.

  Patent Documents 4 and 6 describe an invention in which a light shielding layer is formed by a black matrix and a photoresist, and color ink is ejected to a portion surrounded by the light shielding layer. This method requires many steps such as black matrix formation, photoresist entire surface coating, exposure, pixel portion photoresist removal, color ink ejection, and black matrix photoresist removal. As with the filter manufacturing method, there is a problem that the process is complicated.

  Patent Document 5 describes an invention in which a light shielding layer in which two layers having different widths are stacked is formed, and a pattern is formed on the substrate by an ink jet method. The present invention is for solving the problem that ink repelling occurs at the interface between the light shielding layer and the ink and the film thickness becomes extremely thinner than the pixel center. However, in this method, it is necessary to form two light shielding layers by photolithography, and there is a problem that the process becomes complicated.

Patent Document 7 discloses an invention in which an ink repellent agent layer is formed on a black matrix light-shielding layer produced by a printing method, and color ink is ejected into pixels surrounded by the matrix, thereby obtaining a color filter having no color mixture. Is described. In this method, the ink repellent layer is formed by the photoresist method, so that the number of steps is increased, and the discharged color ink becomes convex, and flatness cannot be obtained in order to maintain the shape after drying. There's a problem.
Japanese Patent Laid-Open No. 08-160219 Japanese Patent Laid-Open No. 11-142641 Japanese Unexamined Patent Publication No. 2000-075121 JP 2001-042313 A JP 2001-183516 A JP 2004-198540 A JP 2006-163306 A

  This invention is made | formed in view of the said situation, and makes it a subject to provide the manufacturing method of the color filter which can form a flat colored layer easily by the inkjet method.

  The method for producing a color filter according to the present invention comprises forming a partition wall that can be removed in the same pattern by a printing method on a black matrix pattern of a substrate on which a black matrix for a color filter is formed, and an inkjet method in a pixel surrounded by the partition wall Then, after the ink is injected at a height not exceeding the partition wall to form a flat colored layer, the partition wall is removed.

  According to the present invention, a color filter excellent in flatness within pixels, density uniformity, and flatness between a black matrix and each pixel can be easily produced by an inkjet method.

  The present invention is described in detail below.

(Transparent substrate)
The substrate used for carrying out the present invention is not particularly limited, and examples thereof include a transparent substrate for color filter and a glass substrate for liquid crystal display.

(Method for forming black matrix and partition wall)
As the black matrix used in the present invention, a black matrix formed by an existing method such as a photolithography method or a relief printing method can be used. In the present specification, hereinafter, the black matrix may be abbreviated as “BM”.
As the ink used for the production of the partition wall, any ink may be used as long as the formed partition wall is not affected by the IJ ink and can be easily removed after the IJ ink is dried and cured.
After forming BM2a on the substrate 1 with BM ink as shown in FIG. 1A, the same pattern as that of BM2a is formed on the substrate 1 on which BM2a is formed by printing as shown in FIG. 1B. A removable partition wall 2b is formed to form an integral wall 2. In FIG. 2, the wall 2 is shown without distinguishing between the BM 2a and the partition wall 2b. After forming the wall 2 as shown in FIG. 2A, the IJ ink is ejected as shown in FIG. 2B, and the colored layer 4 dried and cured as shown in FIG. 2C is formed. Form.

  In addition, the partition wall 2b laminated on the BM 2a is preferably an ink that can be easily removed by dissolving in water, an alkaline cleaning agent or the like after the IJ ink is dried and cured. For example, when the partition walls are removed by washing with water, a water-soluble resin such as hydroxycellulose, polyvinyl alcohol, or polyvinylpyrrolidone may be used as the resin component of the ink. Further, when the partition walls are removed with an alkaline cleaner, an alkali-soluble resin such as a high acid value maleic acid resin may be used as the resin component of the ink. At this time, it is essential that the partition formed of the removable ink does not dissolve in the IJ ink. For this purpose, a resin that does not dissolve in the solvent used for the IJ ink may be selected from the resins described above. Various printing methods can be used to create the partition wall 2b, but the letterpress reverse printing method is particularly suitable for accurately printing a high-definition BM pattern. When using the letterpress reverse printing method, in addition to the thermoplastic resin that can be removed with water, an alkaline release agent, etc. after drying and curing the ink for IJ, an extender pigment, a release agent, a speeding agent for imparting printability Used in combination with dry solvents, slow-drying solvents, surface tension modifiers, and the like.

  The film thicknesses of the BM 2a and the partition wall 2b are desirably determined by the target chromaticity of the color filter coloring layer, the solid content of the IJ ink, and the like. For example, when the target film thickness of the colored layer (described later in detail) is 1 μm and the solid content is 50%, the height of BM2a is preferably 1 μm corresponding to the film thickness B of the colored layer 4 after drying. If it is assumed that the ink 3 is ejected to about 40% of the wall 2 in order to obtain a flat ink surface, the total height of the partition wall (H) is 5 μm and the height of the partition wall 2b is 4 μm. It is desirable.

(Letter-printing reverse printing method)
According to the relief reversal printing method, it is possible to perform overprinting using the same plate and produce a laminated printed matter with little positional deviation. For this reason, it is preferable to form the BM and the partition wall by a letterpress reverse printing method.

  As described above, the BM forming ink is used when forming the BM, and the partition forming ink is used when forming the partition, as described above. When switching from the BM formation step to the partition formation step, not only the ink is changed, but the blanket and / or relief may be replaced.

  The partition wall may be the same relief plate as (A) BM, and the partition wall forming ink patterned with the relief plate may be transferred from the blanket to the substrate. Further, (B) when forming the partition walls, without using a relief printing plate, the non-patterned ink coating film is brought into contact with the BM on the substrate, and only the portion of the partition wall forming ink in contact with the black matrix is removed from the blanket. You may make it transfer on BM. In addition to the relief printing method, photolithography can be used for BM formation at this time.

In particular, according to the latter method (B), a relief printing plate is not required in the partition forming step, and it is only necessary to prepare a relief printing plate for BM formation. Therefore, it is easy to continue the printing process from BM formation to partition formation.
In the former method (A), the relief printing plate is washed when shifting from the BM formation step to the partition formation step, and the BM formation ink is removed from the relief plate, or a plurality of relief plates having the same pattern are prepared, and the BM There is a method of separately using a relief plate used for forming and a relief plate used for forming a partition wall.

In the present invention, the letterpress reverse printing method is a printing method in which a uniform ink film formed on the blanket surface is imaged with a letterpress and transferred to a printing substrate (for example, JP-A-2005-128346). See the publication).
In the following description of the relief printing method, the “printed body” refers to a “substrate” that is a printed body when forming the BM and a “BM” that is a printed body when forming the partition walls. "Substrate on which is formed" is pointed out without distinction.

  A printing apparatus used in the letterpress reverse printing method includes a blanket attached to the surface of a cylinder, an ink application apparatus for applying ink onto the blanket, and a relief plate having a pattern obtained by inverting a pattern to be formed on a printing medium. Configured as mandatory. A relief plate having a pattern obtained by inverting the target pattern is a concave portion corresponding to a pattern formed on a printing medium, and a convex portion corresponding to a region that is not a pattern formed on a printing medium. It is what you have. For the blanket of this printing apparatus, it is preferable to use a material having a certain releasability such as silicone rubber.

Next, a printing method for forming the above-described ink pattern on the printing medium will be described. The method for producing a laminated printed material using the letterpress reverse printing method that can be used in the present invention includes the following steps (1) to (3):
(1) Step of forming an ink coating on the blanket surface (ink coating formation step),
(2) A step of pressing the ink coating film formed on the blanket surface against the relief plate to attach and transfer the ink coating film on the blanket surface to the convex portion of the relief printing plate (pattern formation step),
(3) The step of transferring the ink coating film remaining on the blanket surface onto the printing medium (transfer process) is sequentially repeated to laminate the ink coating film on the printing medium.

  After printing, a printed matter composed of an ink coating layer laminated on a substrate is cured and / or dried to obtain an ink dry coating pattern. Curing can be performed when the ink contains a curable component such as a thermosetting compound, an ultraviolet curable compound, or an electron beam curable compound. When curing is performed, heat treatment, ultraviolet irradiation treatment, electron beam irradiation is performed. A process having an effect of curing the component is performed. The drying can be performed when the ink contains a volatile component such as a solvent, and the volatile component is volatilized by heating, vacuum, or the like.

At this time, the ink coating is performed by sequentially repeating steps (1) to (3) using one relief plate and one blanket without moving the printing medium from the surface plate carrying the printing medium. It is preferable to laminate a film on the substrate. In this way, by repeatedly using the same relief printing plate and blanket throughout the lamination process, it is possible to eliminate factors such as individual variations when different relief printing plates and blankets are used, and to improve the lamination accuracy.
In the present invention, “lamination” of ink layers means that a post-print ink layer is overprinted on a pre-print ink layer, but a part of the post-print ink layer is pre-printed. It does not exclude the case of protruding outside the ink layer and coming into contact with the underlying ink layer or the surface of the substrate.

  A process of drying the ink coating film transferred onto the printing medium while laminating these ink coating films by utilizing a letterpress reverse printing method comprising an ink coating film forming process, a pattern forming process, and a transfer process. The ink film remaining on the surface of the blanket is laminated on the ink film on the surface of the printing medium by a wet-on-wet method (that is, the ink film is dried on the ink film that has not been dried). No ink coating). After laminating a plurality of ink coating films by a wet-on-wet method, when all layers constituting the printed material are cured and / or dried at once on the substrate, the curing and / or drying process is only required once. There are advantages.

  In the present invention, it is preferable to use a low-viscosity ink in order to form a uniform coating film, and to make the ink at a stage where it is applied on the blanket from the ink coating device have a low viscosity. However, by volatilizing part or all of the solvent in the ink at around room temperature between the ink application process and the transfer process, or by allowing the blanket to absorb part or all of the solvent in the ink on the blanket, The viscosity of the ink on the blanket can be increased rapidly.

  Even when the solvent in the ink is volatilized at around room temperature, in order to avoid prolonged time for the entire printing process, after forming the ink film on the blanket surface in the ink film forming process, in the transfer process The time until the ink coating film remaining on the blanket surface is transferred onto the substrate is desirably within 5 minutes, more preferably within 3 minutes, and even more preferably within 1 minute. Thereby, it can avoid taking excessive time about drying of the ink coating film on a blanket. Further, the time from the ink application process to the transfer process can be shortened by using a drying apparatus for volatilization of a part or all of the solvent in the ink.

  In addition, by reducing the solvent content in the ink coating on the blanket and rapidly increasing the viscosity of the ink on the blanket, the ink is transferred to the pre-printed ink coating to transfer and reprint the ink. Since the printing line width is prevented from being crushed, the ink coating is transferred to the substrate, and then the next ink coating is transferred to the substrate by heating or vacuuming. It is not necessary to dry and solidify the preprinted ink coating film through a drying process such as drying. That is, without drying the ink coating film transferred onto the substrate, the ink coating film can be transferred one after another and overprinted many times.

  In order to increase the dynamic viscosity of ink that has already been transferred to the printing medium, the ink film transferred on the printing medium is cured with an electron beam and / or ultraviolet light before transferring the next ink. Can be performed. When this curing step is performed, the ink coating film is formed using an ink containing an electron beam curable compound and / or an ultraviolet curable compound. According to electron beam curing and / or ultraviolet curing, the dimensional change of the printing medium can be suppressed as compared with the case of heat drying or thermal curing, so that the dimensional accuracy of the pattern can be maintained.

  In this case, after the ink coating film is transferred onto the substrate to be printed, a curing process is interposed before the next ink coating film is transferred thereon. However, the curing process using electron beams and / or ultraviolet rays is performed. Can be completed in a shorter time than the drying process, so that there is no possibility of prolonging the time required for many times of lamination even if a curing process is interposed. Even when using an ink containing an electron beam curable compound and / or an ultraviolet curable compound, as described above, a solvent is blended in the ink composition in order to rapidly increase the viscosity of the ink on the blanket. Some solvent remains in the ink coating film after transfer to the printing medium. In the case of the wet-on-wet method, the drying process of the solvent of the ink coating film after the transfer is not performed during the transfer process of each layer for the reason described above, but can be performed once after the lamination of all the layers. preferable. However, in order to increase the dynamic viscosity of the ink that has already been transferred to the printing medium, the residual solvent content should be reduced by means of air blowing, decompression, etc. to the extent that the influence of dimensional change does not appear. Is also possible.

(Formation of colored layer)
In the present invention, as shown in FIG. 2, the colored layer 4 is formed by injecting the ink 3 for forming a colored layer into the wall 2 made of the BM 2 and the partition walls 2b by an ink jet method.

  The ink 3 used for forming the colored layer 4 in the present invention is an ink jet ink that can be ejected by an ink jet (sometimes abbreviated as “IJ” in this specification) method. Ink jet ink is generally a curable colored resin composition, and contains at least a colorant such as a dye and a pigment, and a resin that is cured by application of energy such as heat or light irradiation.

As the resin, a solution of alkyd resin, acrylic resin, urethane resin, epoxy resin, melamine resin or the like can be used.
For example, as a thermosetting resin composition of a combination of a known resin and a crosslinking agent, a melamine resin, a hydroxyl group or carboxyl group-containing polymer and melamine, a hydroxyl group or carboxyl group-containing polymer and a polyfunctional epoxy compound, an epoxy resin and a resol type resin And epoxy resins and amines, epoxy resins and carboxylic acids or acid anhydrides, and epoxy compounds.
As the photocurable resin composition, for example, a photocurable resin composition such as a negative resist is used.

Further, the colorant contained in the ink for IJ may be either dye-based or pigment-based, and is not particularly limited. , Indanthrone, flavanthrone, perylene, diketopyrrolopyrrole, perinone, quinophthalone, anthraquinone, thioindigo, benzimidazolone, azo dyes and pigments, and inorganic pigments such as carbon black Etc.
The amount of the dye and pigment contained in the IJ ink is preferably 0.1 to 20% by mass, but is not limited thereto.

  Examples of the solvent used in the IJ ink include water and aromatic hydrocarbons, alcohols, ethers, esters, and ketones. Among these, those having a boiling point of 200 ° C. or more, a viscosity of 10 mPa · s or less, and those that do not dissolve and swell the head member are preferable. Examples thereof include higher alcohols, glycols, glycerins, glycol monoethers, pyrrolidones, and derivatives thereof. These solvents may be used alone or in combination of two or more. In addition, it is essential that these solvents do not dissolve the partition walls.

In addition to the above components, additives such as surfactants, antifoaming agents, preservatives and the like can be used to obtain desired characteristics as required.
Further, light or thermosetting resin that does not dissolve in water or an organic solvent may be used as long as it can be stably discharged. For example, a solventless type in which a dye and a pigment are dissolved in a monomer can be used. .
Examples of the dispersing machine used for dispersing the colorant include a bead mill such as a sand grinder, a ball mill, and an attritor, a roll mill, a kneader, a dissolver, and a high speed mixer.

(Ink discharge by inkjet)
The ink jet method used in the present invention may be a continuous ink jet method, an on-demand bubble jet (registered trademark) method, a piezo jet method, or the like, but is not particularly limited.

  For example, when forming a colored layer for three color filters of RED, GREEN, and BLUE (red, green, and blue), the ink for RED, GREEN, and BLUE color filters is prepared with the above-mentioned IJ ink, and a transparent substrate A colored layer 4 is formed by injecting ink 3 into an area (concave portion) surrounded by a wall 2 provided on 1 by an ink jet method. When the ink 3 is injected, it is preferable to inject the ink 3 so as to be less than 50% of the height H of the wall 2. Here, the height H of the wall 2 is the height of the entire wall composed of the black matrix 2a and the partition walls 2b. That is, when the thickness of the ink 3 at the time of injection is A, the percentage represented by “A / H × 100%” is less than 50%. Thereafter, the color layer 4 (thickness B) of the color filter is formed by curing the ink 3 by applying energy such as heat or light irradiation. The surface of the colored layer 4 of the color filter formed by this method is flat, and post-processing such as surface polishing is unnecessary.

(Removal of partition walls)
As described above, since the partition 2b can be removed, the partition 2b is removed after the colored layer 4 is formed. Thereby, a color filter in which the BM 2a is formed on the substrate 1 and the colored layer 4 is formed in the BM 2a is obtained.
The height of BM2a may be the same as the thickness B of the colored layer 4, as long as it can function as a black matrix for a color filter, or may be larger or smaller than B.

  Hereinafter, the present invention will be specifically described with reference to examples.

(Example: Example of forming wall with BM ink and partition wall ink)
Ink for black matrix of color filter (manufactured by DIC Corporation, BM ink: 233BM) by a reverse printing method using a cylinder having a silicone blanket and a relief plate with a line width of 18 μm using a glass substrate as a printing medium, and A partition wall ink (RERT-01, manufactured by DIC Corporation) with rosin-modified maleic resin as a main resin is overprinted in this order, and a matrix-shaped printed matter having a BM at the bottom of the wall and an ink for the partition at the top. Obtained. This printed material was baked at 230 ° C. for 1 hour and used in an inkjet discharge process.

  Ink for IJ (DIC stock) using diethylene glycol monoethyl ether acetate as the main solvent, using an inkjet printer (Konica Minolta Co., Ltd .: IJ Evaluation Board EB100, Musashi Engineering Co., Ltd .: SHOTMASTER 300) in the recesses of the matrix-shaped printed matter. IJ Blue ink: 7423-SE02BJ) was discharged.

  When the surface shape of the printed material on the glass substrate was measured with a surface roughness measuring device, as shown in Table 1, the liquid level height A of the inkjet ink immediately after ejection was less than 50% of the height H of the matrix wall. In some cases, a flat ink surface was obtained, and a flat colored layer was obtained after drying and curing at 230 ° C. for 30 minutes. The obtained printed matter on the glass substrate was immersed in an alkaline resist cleaning agent (55% monoethanolamine 30% aqueous solution at 55 ° C.) for 10 minutes together with the glass substrate to remove the partition walls.

When the surface shape of the printed matter on the obtained glass substrate was measured with a surface roughness measuring device, the partition wall was removed, and the portion surrounded by the inside was used for inkjet as shown in FIGS. An ink print was obtained.
The liquid surface shape immediately after ink jet ink ejection and the surface shape of the printed matter on the glass substrate after drying and curing and removing the partition walls were measured with a surface roughness measuring device. FIG. 3 shows the liquid surface shape immediately after drying and curing as measured by the surface roughness measuring device, and FIG. 4 shows the surface shape of the printed material on the glass substrate after removing the partition walls. 3 and 4, the horizontal axis length direction represents the length along the surface of the transparent substrate (the width direction of the matrix wall), and Z represents the direction perpendicular to the surface of the transparent substrate (the height of the matrix wall). Direction). In these graphs, the length direction and the Z direction are different in scale, and the Length direction is relatively reduced as compared to the Z direction.

(Reference Example 1: Example of forming the entire wall with BM ink)
Ink for forming a black matrix for a color filter (manufactured by DIC Corporation, BM ink: 233BM) using a glass substrate as a substrate to be printed, and a relief printing method using a cylinder having a silicone blanket and a relief plate having a line width of 18 μm. Was printed to obtain a matrix-shaped printed matter. This printed material was baked at 230 ° C. for 1 hour and used in an inkjet discharge process.

  Ink for IJ (DIC stock) using diethylene glycol monoethyl ether acetate as the main solvent, using an inkjet printer (Konica Minolta Co., Ltd .: IJ Evaluation Board EB100, Musashi Engineering Co., Ltd .: SHOTMASTER 300) in the recesses of the matrix-shaped printed matter. IJ Blue ink: 7423-SE02BJ) was discharged. When the surface shape of the obtained printed matter on the glass substrate was measured with a surface roughness measuring device, as shown in Table 2, the liquid level height A of the inkjet ink immediately after ejection was 41% of the height H of the matrix wall. In the following cases, a flat ink liquid surface was obtained, and a flat colored layer was obtained after drying and curing at 230 ° C. for 30 minutes.

(Reference Example 2: Example of forming a matrix wall only with partition wall ink)
As a reference example, a colored layer was formed by ejecting ink by the same method using a matrix wall formed only with partition wall ink.
Septum ink (made by DIC Corporation, RERT, made of rosin-modified maleic resin) by a letterpress reverse printing method using a glass substrate as a substrate, a cylinder having a silicone blanket, and a letterpress with a line width of 18 μm. -01) was printed, and a matrix-shaped printed matter was obtained. This printed material was baked at 230 ° C. for 1 hour and used in an inkjet discharge process.

  Ink for IJ (DIC stock) using diethylene glycol monoethyl ether acetate as the main solvent, using an inkjet printer (Konica Minolta Co., Ltd .: IJ Evaluation Board EB100, Musashi Engineering Co., Ltd .: SHOTMASTER 300) in the recesses of the matrix-shaped printed matter. IJ Blue ink: 7423-SE02BJ) was discharged. When the surface shape of the obtained printed matter on the glass substrate was measured with a surface roughness measuring device, as shown in Table 3, the liquid level height A of the inkjet ink immediately after ejection was 33% of the height H of the matrix wall. In the following cases, a flat ink liquid surface was obtained, and a flat colored layer was obtained after drying and curing at 230 ° C. for 30 minutes.

  FIG. 5 shows the ink liquid surface shape immediately after ejection measured by the surface roughness measuring device in the above reference example, and FIG. 6 shows the surface shape of the colored layer after drying and curing. 5 and 6, X represents the length in the direction along the surface of the transparent substrate (the width direction of the matrix wall), and Z represents the direction perpendicular to the surface of the transparent substrate (the height direction of the matrix wall). Represents length. In these graphs, the X direction and the Z direction are different in scale, and the X direction is relatively reduced compared to the Z direction. In this reference example, FIG. 6 shows the partition wall after the drying and curing before removal.

  When the ink liquid surface shape immediately after ejection is a mountain shape (see (3) in FIG. 5), it becomes a mountain shape (see (3) in FIG. 6) even after drying. When the ratio of the ink liquid surface height A to the matrix wall height H (ie, A / H) is equal to or smaller than a predetermined value, the ink liquid surface shape immediately after ejection is flat ((in FIG. 2), and after drying (FIG. 6), it becomes flat (see (2) in FIG. 6), and a step of forming a removable partition wall on the BM and a step of removing it. The headline and the present invention were completed.

  The present invention can be used for manufacturing a color filter used for a liquid crystal display (LCD), for example.

It is explanatory drawing of the partition formation process in this invention, Comprising: (a) is sectional drawing which shows the state in which the black matrix was formed on the transparent substrate, (b) is the state which formed the partition on the black matrix, respectively. . It is explanatory drawing of the colored layer formation process in this invention, Comprising: (a) is the state which formed the wall which consists of a black matrix and a partition on a transparent substrate, (b) is the state which ejected the ink in the wall, ( c) is a cross-sectional view showing a state where the ink is dried and cured. It is a graph which shows an example measured with the surface roughness measuring apparatus before the partition removal in this invention. It is a graph which shows an example measured with the surface roughness measuring apparatus after the partition removal in this invention. It is a graph which shows an example which measured the ink liquid level shape immediately after discharge with the surface roughness measuring device, (1) when IJ ink is not discharged, (2) when the liquid level of IJ ink is moderate, (3) shows the case where the liquid level of the IJ ink is high. A square part shows BM and a partition. It is a graph which shows an example which measured the surface shape of the colored layer after dry-curing with the surface roughness measuring apparatus, (1) when IJ ink is not ejected, (2) when the liquid level is moderate, 3) shows the case where the liquid level of the IJ ink is high. A square part shows BM and a partition.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Transparent substrate, 2 ... Wall, 2a ... Black matrix, 2b ... Partition, 3 ... Ink for colored layer formation, 4 ... Colored layer.

Claims (4)

  A partition wall that can be removed in the same pattern is formed on the black matrix pattern of the substrate on which the black matrix for the color filter is formed by a printing method, and ink is applied to the pixels surrounded by the partition wall at a height that does not exceed the partition wall by an inkjet method. A method for producing a color filter, wherein the barrier ribs are removed after injection to form a flat colored layer.   The method for producing a color filter according to claim 1, wherein the black matrix and the partition are continuously formed by overprinting using a relief printing method.   The partition wall is formed by applying a partition wall forming ink to a silicone blanket and bringing it into contact with a substrate on which a black matrix is formed, and transferring only a portion of the partition wall forming ink in contact with the black matrix from the silicone blanket onto the black matrix. The manufacturing method of the color filter of Claim 1 or 2 formed by doing.   The method for producing a color filter according to any one of claims 1 to 3, wherein the ink for forming the colored layer is injected so as to be less than 50% of the height of the wall made of the black matrix and the partition walls.

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