JP2007140214A - Color filter and manufacturing method of color filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To form a color filter, at a low cost, wherein overflow of an ink from a partition wall having ink repellent properties and there is no void of the ink for a color filter at a pixel forming part and a pixel colored by the ink for the color filter has satisfactory flatness in a method for packing the ink for the color filter by an ink jet method. <P>SOLUTION: The contact angle of the packed ink for the color filter is specified to be 10 to 30° in an aperture part enclosed by partitions. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a color filter that is used for a color filter of a color liquid crystal display device and has a slant wall that can also be used as a black matrix, and a manufacturing method thereof.
In particular, the present invention relates to a color filter having a color desired to be reproduced by filling an appropriate amount of colorant ink between partition walls using an ink jet device, and a method for manufacturing the same.

  As a method for forming a color filter or the like of a color liquid crystal display device at a low cost, a method of supplying color material ink for a color filter to a color filter substrate by an ink jet method has been proposed. However, since the ink particles ejected by the ink jet device collide with the substrate and spread at the portion, the partition wall is formed around the pixel portion so as not to spread outside the predetermined portion (pixel portion). There has been proposed a method for forming a convex portion serving as a role. Since the peripheral portion of each pixel needs to be a black matrix having a light-shielding property, it is preferable that the partition walls used as the convex portion also serve as the black matrix of the color filter, and many techniques have been proposed. In the present invention, the black matrix including the black stripe is referred to as a black matrix.

  The components of the color filter ink when producing a color filter using an ink jet apparatus are designed to have a low viscosity so as to be convenient for jetting during ink jetting. For this reason, the composition is generally adjusted to have a low solid content and a high solvent content. For example, there are many proposals that usually use a solid content of about 10% to 25%. However, as a result, the amount of color filter ink that fills the pixel portion, that is, the opening surrounded by the partition wall, is smaller than the thickness of the predetermined color material layer as the pixel. It is necessary to supply 4 to 10 times the amount. For this reason, normally, at least the upper surface of the partition wall is supplied with ink repellency so that the color filter ink does not spread to other than a predetermined place.

However, in the method of manufacturing a color filter by an ink jet method using an ink-repellent partition wall on the upper surface, there is a problem of “color mixture (overflow)”, “white spot”, and “thickness non-uniformity”.
First, “color mixing (overflow)” is an obstacle that occurs when the color filter ink crosses over the partition walls (overflows) and mixes between adjacent colored pixels of different colors. This occurs because the amount exceeds the height of the partition wall. As a method for preventing this, as disclosed in Patent Document 1 and Patent Document 2, there is a method of making the entire partition walls have ink repellency.
In this case, if the side surface of the partition wall is also ink repellant, the color filter ink filled inside the opening surrounded by the partition wall is thin at the portion in contact with the partition wall, thicker near the center, A place called “white spot” that is not filled with ink occurs, and the performance as a color filter does not satisfy the specifications.

In order to avoid this, for example, Patent Document 3 discloses that the partition wall has a structure in which an ink repellent layer and a parent ink layer are alternately stacked. In Patent Document 4, Patent Document 5, and Patent Document 6, after applying a partition material, a treatment with an ink repellent agent is performed, followed by patterning by a photolithography process, and then a recess surrounded by the partition is used as a parent. A method of performing an ink process is disclosed. Further, Patent Document 7 discloses that an ink-repellent black matrix partition is formed, and a layer of a parent ink material is formed on the side surface of the black matrix and the pixel portion in a subsequent process.
In any case, making the upper surface of the partition wall ink repellent and making the side surface and the bottom surface of the concave portion ink-philic in a separate process is a cause of cost increase.
Further, Patent Document 8 describes a method of forming a color filter by forming an ink-repellent underlayer on the transparent substrate and suppressing the spread of the color filter ink. Also in this method, there is a problem that the pixel filled with the ink jet apparatus has a convex shape and the color density varies within the pixel. In addition, this method has a problem that it is difficult to prevent overflow of ink to adjacent pixels.
JP-A-10-206627 JP-A-6-347637 Japanese Patent No. 3646510 JP-A-9-203803 Japanese Patent Laid-Open No. 9-230127 Japanese Patent Laid-Open No. 9-230129 JP 2005-173324 A JP 2003-114319 A

  The problem to be solved by the present invention is that the color filter ink overflows between pixels at a lower cost than the conventional method while obtaining a partition suitable for creating a color filter by inking with an inkjet apparatus. It is an object of the present invention to provide a color filter that does not mix colors, has less uneven color material thickness and white spots in the pixel, and has less color unevenness in the pixel, and a method for manufacturing the color filter.

(Invention of Claim 1)
The present invention is a color filter having at least a plurality of colored portions and a partition located between the adjacent colored portions on a transparent substrate, wherein the partition is made of a resin composition formed on the transparent substrate. The colored portion is formed by curing the color filter ink, which is a colored ink filled by an ink jet method in the opening surrounded by the partition, and is filled with the partition portion and the color filter ink. The color filter is characterized in that the entire surface with the opening portion is a treated surface having a contact angle of 10 to 30 degrees with the color filter ink to be filled.
(Invention of Claim 2)
The treated surface is coated, dried, and cured with a transparent resin coating that has a contact angle of 10 to 30 degrees with the color filter ink after coating, drying, and curing, and is transparent. It is good that it is a layer.
(Invention of Claim 3)
The composition of the transparent resin paint is compatible with the resin content of the color filter ink in the paint obtained by removing the color pigment from the same color filter ink as the color filter ink to be filled and imparting photocurability. It is preferable that an ink repellency imparting agent is added.
(Invention of Claim 4)
The ink repellency-imparting agent added to the transparent resin paint is preferably a silicone resin-based one.
(Invention of Claim 5)
The partition is preferably a light shielding layer.
(Invention of Claim 6)
And it is good to have a protective layer on the said colored part formed by hardening | curing the ink for color filters with which the said opening part was filled.
(Invention of Claim 7)
And it is favorable to have a transparent conductive film on the surface.

(Invention of Claim 8)
Another invention is a method for producing the above color filter, wherein a photosensitive resin composition layer is formed on a transparent substrate, and after pattern exposure on the photosensitive resin composition layer, development is performed to form a partition wall. A step of forming a pattern, a step of irradiating the partition pattern with light and photocuring to form a partition, and a transparent and ink repellency imparting agent on the partition and the opening surrounded by the partition A step of forming a surface of an ink-repellent partition wall and a surface of an ink-repellent opening with respect to the color filter ink to be filled; And a step of filling the color filter ink to form a colored pixel.
(Invention of Claim 9)
Then, the surface of the partition wall and the surface of the opening are formed with respect to the color filter ink to be filled by the above-described step of forming the surface of the ink repellent partition wall and the surface of the ink repellent opening with respect to the color filter ink to be filled. It is preferable that the contact angle be 10 to 30 degrees.
(Invention of Claim 10)
The transparent resin coating can be photocured and photocured.
(Invention of Claim 11)
And the said transparent resin coating material can be made thermosetting, and can be heat-hardened.
(Invention of Claim 12)
The surface of the partition wall and the surface of the opening have a contact angle of 10 to 30 degrees with respect to the color filter ink to be filled by adjusting the kind and amount of the ink repellency imparting agent added to the transparent resin paint. It is good to be taken.
(Invention of Claim 13)
When the contact angle between the surface of the partition wall and the surface of the opening with respect to the color filter ink is 10 degrees, the supply amount of the color filter ink to be filled is up to twice the volume surrounded by the partition wall. When the contact angle between the partition wall surface and the opening surface with respect to the color filter ink is 20 degrees, the supply amount of the filter ink is up to 3.5 times, and the supply amount of the color filter ink to be filled is When the contact angle between the partition wall surface and the opening surface with respect to the filter ink is 30 degrees, the contact angle is preferably up to 5 times.
(Invention of Claim 14)
And the said partition can be formed with a black resin composition.

The effect of the first aspect of the present invention is that the partition and the opening for obtaining the pixel have an appropriate ink repellency, so that the color filter ink filled in the opening does not overflow and white spots are eliminated. In other words, a color filter with little color unevenness in the pixel can be obtained.
The reason why at least the upper surface of the partition wall does not have ink repellency and the opening does not have to be ink-philic as usual is as follows. Even if the contact angle with respect to the color filter ink is set to 10 degrees or more instead of 10 degrees or less as usual at the opening, if the color filter ink is filled, white spots should be eliminated. In addition, since there are basically similar components to the color filter ink in the opening, it is unlikely that only some of the openings will have strong ink repellency for some reason. Even if the ink repellency-imparting agent on the upper surface of the partition wall bleeds (bleeds out) during the heat treatment, the film in the opening is compatible with the ink repellency-imparting agent, so only a part of the ink repellency is strong. As a result, there should be no white spots or thickness reduction near the partition walls. The entire surface of the opening has a uniform ink repellency to some extent (contact angle of 10 to 30 degrees), so that the color filter ink is filled without any unevenness. In addition, when white spots occur, the amount is more than a predetermined amount in the place where the color filter ink is filled, causing overflow. However, as described above, white spots do not occur. There will be no flow.

  On the other hand, it is said in the publicly known materials that the ink repellency of the upper surface of the partition wall is 30 degrees or more, preferably 40 degrees, sometimes 100 degrees or more. By setting the amount according to the contact angle, overflow can be prevented. Therefore, a high-quality color filter can be obtained without using a complicated structure in which the upper surface of the partition wall is ink repellent and the opening is ink-philic as in the prior art.

  Further, since the ink repellency is not so high in the structure of the present invention, the color filter ink is in contact with the side surface of the partition wall. The amount of ink decreases due to the volatilization of the solvent, but the viscosity of the color filter ink increases, and the ink content of the color filter ink (resin component) and the side wall (treated surface) of the partition wall (treated surface). By making the vehicle component (resin component) the same, the familiarity is improved and the thickness of the color filter ink is hardly reduced even in the vicinity of the partition wall.

-1st form The 1st form uses what processed the transparent substrate for color filters, and made the contact angle with respect to the ink for color filters supplied from an inkjet device become 10-30 degrees, A partition having a contact angle of 10 to 30 degrees is formed there, and a pixel portion (opening) between the partitions is filled with ink for a color filter by an ink jet method.

(Processed surface of transparent substrate)
As a method for setting the contact angle of the surface of the transparent substrate for the color filter to 10 to 30 degrees with respect to the color filter ink supplied by the inkjet apparatus, an ink repellency imparting agent (ink repellent agent) is applied to the surface of the transparent substrate. There is a method of forming a layer of transparent resin paint A to which is added. As the main component resin of the transparent resin paint A, it is preferable to use the main component resin of the color filter paint, but the dispersibility of the colored pigment does not need to be taken into consideration, so the selection range is widened. For example, an acrylic resin or a cardo resin can be preferably used.
The ink repellency imparting agent to be added is preferably of a type that dissolves in a transparent resin in order to easily adjust the contact angle. Among these, resins that are soluble in resins used for color filters, such as acrylic resins and cardo resins, are preferred. Then, the contact angle is adjusted by adjusting the addition amount of the ink repellency imparting agent. In order to set it to 10 to 30 degrees, it may be added in an amount of usually 0.05 to several wt% with respect to the resin content.
In addition, when the partition material for forming the partition is applied or when the color filter ink is filled, the above-described layer formed as a treatment surface by adding an ink repellency imparting agent does not dissolve in those solvents. In order to do so, the above-mentioned transparent resin needs to be polymerized and cured. The curing method may be heat curing or radiation curing. Preferably, it is a UV curable type, and as the transparent resin used at that time, a photosensitive transparent resin, which is a composition component obtained by removing the pigment from the color filter ink, has the same refractive index and reflects. First, it is preferable from the viewpoint of not occurring and familiarity.

(Partition wall)
On the other hand, the partition formed on the treated surface of the surface of the transparent substrate also has ink repellency on the upper surface and side surfaces. In order to obtain this partition, the partition itself may be formed from an ink-repellent partition material. The partition material having ink repellency is similarly made to exhibit ink repellency by adding an ink repellency imparting agent to the partition material. The ink repellency-imparting agent is preferably added to the transparent resin. The method for forming the partition wall may be any of a normal photolithography method, a printing method, and a transfer method. After the partition walls are formed, when filling the color filter ink, it is necessary to be cured so as not to dissolve in the solvent of the color filter ink. The curing method may be heat curing or UV curing. When the partition walls are formed of a black matrix material (a black matrix material having the same ink repellency as described above), it is preferable to perform heat curing.

As the ink repellency-imparting agent, a fluororesin-based one and a silicone resin-based one can be used. Within the range of the amount to be added, it must be compatible with the main vehicle component (resin component) of the transparent resin paint A, but the amount added is usually about 0.1 to several percent. Any material that is compatible in the range can be used.
As the fluororesin-based or silicone resin-based ink repellency-imparting agent, ordinary ones can be used. For example, what is added to an acrylic adhesive for adjusting the peel strength can be used. Moreover, it can select from what is added to various resin and exhibits water repellency, solvent repellency, mold release property, and abrasion resistance. If there is an adverse effect from bleeding, use a material that reacts with the vehicle, or the same skeleton as the main component resin of the transparent resin paint A, a similar resin, or a compatible resin. It is preferable to use a polymer obtained by polymerizing a silicone resin component in a pendant type. In that case, the fluororesin content and the silicone resin content appear on the surface when the transparent resin paint A is dried or heat-treated, and exhibit ink repellency, but the skeleton part is mixed with the transparent resin paint A. Do not bleed too much. Further, a vehicle having a structure imparted with reactivity as disclosed in JP-A-2004-45910, JP-A-2004-177948, and JP-A-2005-60515 is used, and a vehicle for transparent resin paint A is used. It is preferable to react with the minute and set in the stitch structure.

As the kind of the ink repellency imparting agent, a fluororesin-based one and a silicone resin-based one can be used. However, the silicone resin-based one has heat resistance and has a contact angle with the color filter ink. In the case of adjusting at 10 to 30 degrees, it is preferable because the addition amount can be easily adjusted.
Further, the ink repellency may be different between the opening part and the partition part or may be the same.
The effect of setting the ink repellency to a contact angle of 10 to 30 degrees with respect to the color filter ink is the effect of overflow prevention, whiteout prevention and color as described in the section of the effect of the invention and the following examples. The effect of improving the flatness of the surface of the filter portion is obtained in a balanced manner. Therefore, the ink repellency of the opening portion and the partition wall portion may be different, and the ink repellency of the partition wall portion is the same as the ink repellency in the contact angle range of 10 to 30 degrees. A higher ink property is preferred.

-Second form As the second form, after forming a partition wall having no ink repellency on a transparent substrate for a color filter, the entire surface where the ink repellency is required is used as the treatment surface. Is formed with a layer of an ink-repellent transparent resin paint B (surface coating type contact angle adjusting agent), and then a pixel portion (opening) between the partition walls is filled with ink for a color filter by an inkjet method. Is.
In the case of this form, the ink repellency (contact angle with respect to ink) is basically the same between the partition wall and the opening. However, due to the heat treatment or the like, the component of the partition wall and the ink-repellent transparent resin paint B may react to change the ink repellency. Also in this case, it is preferable that the ink repellency of the partition wall portion is larger than that of the opening portion.

(Partition wall)
The partition preferably serves also as a light-shielding layer (black matrix) for the color filter. As a black matrix material in that case, a material obtained by mixing a photosensitive resin with carbon, titanium oxide, or other visible light absorber as a light shielding material can be used. As the photosensitive resin, a photosensitive acrylic resin or cardo resin usually used for this kind of black matrix material can be used.
As a method of forming the partition using the black matrix material, a normal photolithography method is used. In addition, it may be formed by a printing method or a transfer method. The height of the partition wall is preferably 1 to 4 μm, but the specification takes precedence. In the case of the present invention, since the contact angle with respect to the color filter ink is 10 to 30 degrees, it is preferable that the contact angle is higher than that in the case where the generally known contact angle is 50 degrees or more.
Compared with the case of the first embodiment, the second embodiment selects an ink repellency-imparting agent to be added to the transparent resin paint A while considering the partition material and the opening portion, or actually prepares it. The advantage is that there is no need to do this.

  The ink-repellent transparent resin paint B may be the same as the ink-repellent transparent resin paint A described in the first embodiment. The resin component may or may not be compatible with the resin component of the partition wall material.

(Color filter ink)
As the color filter ink to be filled by the ink jet method, those usually used for this purpose can be used. However, when forming a protective layer on it, in order not to melt | dissolve in the solvent, it is necessary to be photocurable or heat-curable.
In order to meet this purpose, an ink-jet color filter ink using a photo-curable and heat-curable resin component used in a normal photolithographic color filter can be used.
(Protective layer)
The main purpose of forming the protective layer on the colored portion (the portion where the color filter ink is filled in the opening and cured) is a base for forming a transparent conductive film, and for improving flatness. is there. As the material, a photosensitive curable transparent resin usually used for this purpose can be used.
It is preferable to use ITO as the transparent conductive film. As a film forming method, a vacuum film forming method such as a sputtering method can be used. The thickness is preferably 1000 to 3000 mm.

Next, the manufacturing process of the color filter will be described in detail with reference to the drawings.
FIG. 1 shows the basic steps of one embodiment of the manufacturing method of the present invention.
・ Figure 1 (a)
In the present invention, first, the partition wall 2 is formed on the transparent substrate 1 as a black matrix having a light shielding property.
As a glass plate that can be used for the transparent substrate 1, a quartz glass plate, a synthetic quartz glass plate (for example, neo-ceram plate), a low expansion glass plate (for example, Eagle 2000 manufactured by Corning) used for a liquid crystal panel, a plasma display There is a high strain point glass plate (for example, PD-200 manufactured by Asahi Glass) used for panels.
The types of plastic film that can be used for the transparent substrate 1 are polyethylene terephthalate film, polybutylene terephthalate film, polycycloolefin film, biaxially oriented polypropylene film, polycarbonate film, polyamide film, polyvinyl chloride film, methacryl-styrene. There are resin films, polyimide films, silicone resin films, fluororesin films, and the like.

(Formation of black matrix)
The black matrix may be formed by using a general photolithography method described below, or other methods such as a printing method or a transfer method.
In the case of the photolithography method, as shown in FIG. 2A, the black matrix resist 3 is uniformly applied on the entire surface of the transparent substrate 1. The application method may be a rotary coater method such as a spin coater, or a non-rotating coating such as a roll or a slit method, but a non-rotating slit method is preferable for dealing with a large substrate.
Next, as shown in FIG. 2 (b), the mask 4 is placed on the film of the black matrix resist 3, which is a uniform film on the transparent substrate 1, formed using the mask 4, and the UV light 5 Is applied to cure the black matrix resist 3 in the opened portion. (exposure)
Further, as shown in FIG. 2 (c), the uncured black resist 3 is washed away with the developing solution 6 to form a black matrix. (developing)
Finally, the black resist 3 is cured by heating as shown in FIG. The heating temperature is 200 to 250 ° C., and the time is several minutes to several tens of minutes. In the figure, reference numeral 7 denotes a heater.
A black matrix (partition wall 2) is formed by the above process.

・ Figure 1 (b)
Next, a curable transparent resin coating (B) having ink repellency is applied to the upper surface of the transparent substrate 1 so as to cover the partition wall 2 formed, and the upper surface of the partition wall 2 is surrounded by the partition wall 2. A thin film layer 9 is formed on the side and bottom surfaces of the opening 8, and the top surface of the partition wall 2 and the side and bottom surfaces of the opening 8 are treated surfaces. The thickness of the layer 9 is preferably about 0.02 to 0.5 μm.
As the ink repellency-imparting agent, a fluororesin or silicone resin is used. For example, as a transparent resin solution, a transparent photo-curing material obtained by removing a pigment from a resist for a photolithographic color filter is used, and an ink repellency-imparting agent to be added is a silicone agent (Modiper made by Nippon Oil & Fats). FS710).
The amount of the silicone agent added is such that the contact angle with the color filter inks 10R (red), 10G (green), and 10B (blue) to be dropped after the layer 9 is formed into a thin film is 10 to 30 degrees. Adjust to.
The coating apparatus may be a rotary coating method such as spin coating or a non-rotating coating method such as a roll or slit method. However, a non-rotating slit method is suitable for a large substrate.
The liquid agent to be coated is desirably dilute, and may be coated after being diluted with the main organic solvent of the photocurable resist agent so that the solid content ratio is several percent or less, and the organic solvent component is volatilized for thin film coating.

・ Figure 1 (c)
After the layer 9 is formed into a thin film, the surface is irradiated with UV light 11 and cured when the transparent resin paint (B) is made photosensitive. In the case of the thermosetting type, curing is performed using, for example, an infrared lamp.
・ Figure 1 (d)
Each opening 8 is filled with color filter inks 10R, 10G, and 10B by an inkjet method.
・ Figure 1 (e)
Thereafter, as shown in the drawing, the color filter is cured by heating using a heater 7 to obtain a color filter having pixels in which the color filter ink filled in each opening 8 is cured.

(Formation of black matrix)
Corning Eagle 2000 (465 × 360 mm, thickness 0.7 mm) was used as a transparent substrate for the color filter, the surface was washed by a normal method, and then a photosensitive light-shielding film material (black) containing carbon black. As a matrix material, a black matrix negative resist “V-259 BK739P” (manufactured by Nippon Steel Chemical Co., Ltd.) was applied using a slit coater so as to have a dry thickness of 2.0 μm.
The photosensitive light-shielding film material layer was exposed to a predetermined amount of light using a photomask having a desired black matrix pattern portion as a transmission portion and a parallel light exposure machine. As a developing solution, a predetermined one containing an alkaline aqueous solution as a main component was used, washed for a predetermined time by a spray developing method, washed with water and dried. The width of the black matrix (partition) is 20 μm, the pitch is 300 μm in length, and 100 μm in width. The steps so far are the same as the steps for forming a normal black matrix. When the contact angle with the inkjet ink (R, G, B) for color filter filled between the black matrix described later is measured with an automatic contact angle meter (AV type) manufactured by Kyowa Interface Science Co., Ltd. 3 degrees or less and 4 degrees on the upper surface of the black matrix.

(Preparation and application of base material for surface coating type contact angle adjusting agent)
Next, a surface coating type contact angle adjusting agent (transparent resin paint B to be layer 9 in the above embodiment) was prepared as follows.
First, 20 parts of methacrylic acid, 10 parts of methyl methacrylate, 55 parts of butyl methacrylate and 15 parts of hydroxyethyl methacrylate are dissolved in 300 g of butyl lactate as a base material, and 0.75 parts of azobisisobutylnitrile is added under a nitrogen atmosphere to 70 ° C. The acrylic copolymer resin was obtained by reaction for 5 hours. The obtained acrylic copolymer resin was diluted with cyclohexanone so that the resin concentration was 3% by weight.
In this solution, NK ester ATMPT (manufactured by Shin-Nakamura Chemical Co., Ltd.) as a photosensitive monomer is 3.5% by solid content ratio, Irgacure 907 (manufactured by Ciba Geigy) as a photopolymerization initiator is 0.12% by solid content ratio, Kayacure Add DETX (Nippon Kayaku Co., Ltd.) to a solid content ratio of 0.12%, and add a silicone resin ink repellent Modiper FS-710 (Nippon Oil & Fats) to a solid content ratio of 1.5%. An angle adjuster was used.
This solution was applied to a transparent substrate on which a black matrix was formed with a roll coater, then cured by irradiating with UV light at 500 mJ, and further heat-treated at 160 ° C. for 30 minutes. The thickness of the surface coating type contact angle adjusting agent after treatment (the thickness of the layer 9) was about 100 nm on the upper surface of the black matrix and about 100 nm on the upper surface of the transparent substrate between the black matrices. Further, the contact angle for the color filter ink described later is 12 degrees on the surface of the upper surface of the black matrix made of the surface coating type contact angle adjusting agent, and the surface of the upper surface of the transparent substrate made of the surface coating type contact angle adjusting agent. It was almost the same at 12 degrees. In addition, although the surface which consists of the said surface coating type contact angle adjusting agent on the side surface of a black matrix has not been measured, it seems that it is a substantially same contact angle from the mode of wetting with respect to the ink for color filters mentioned later.

(Adjustment of ink for color filter for inkjet)
20 parts of methacrylic acid, 10 parts of methyl methacrylate, 55 parts of butyl methacrylate and 15 parts of hydroxyethyl methacrylate are dissolved in 300 g of butyl lactate, and 0.75 part of azobisisobutylnitrile is added in a nitrogen atmosphere, and the reaction is carried out at 70 ° C. for 5 hours. As a result, an acrylic copolymer resin was obtained. The resulting acrylic copolymer resin was diluted by adding propylene glycol monomethyl ether acetate so that the resin concentration would be 10% to obtain a diluted solution of the acrylic copolymer resin. 19.9 g of pigment and 0.9 g of dispersant were added to 80.1 g of this diluted solution, and kneaded with three rolls to obtain red, green and blue colored varnishes. Each colored varnish was adjusted with propylene glycol monomethyl ether acetate so that the pigment concentration was 12 to 15% and the viscosity was 15 cps, and three colored inks of R, G and B were obtained. (NV (non-volatile component) = 22%)

(Production of color filter)
The R, G, and B colored inks are used for the openings (pixel forming portions) surrounded by the black matrix of the transparent substrate for the color filter that covers the entire surface-coated contact angle adjusting agent. , 12 pl, 180 dpi head mounted inkjet printing apparatus, each pixel of red (R), green (G), blue (B) was ejected 160 pl of ink for each color to form colored pixels. Since the volume of one pixel surrounded by a black matrix with a height of 2 μm is about 45 pl, about 3.5 times that amount of ink has been ejected, but the ink fills without overflowing to the adjacent pixel formation section. Stayed in the pixel formation portion.

  When the color filter thus prepared was observed, color mixing due to overflow was not confirmed. In addition, each pixel had a so-called white spot where no ink was placed in the pixel, the ink was uniformly spread in the region, the film thickness was uniform, and the color difference was as good as ΔEab3 or less. Moreover, after drying the color filter ink, the surface shape was measured with a contact-type surface shape measuring instrument, and the shape was satisfactory.

  The surface coating type contact angle adjusting agent was tested under the same conditions except that the addition amount of the silicone resin ink repellent Modiper FS-710 was changed. Table 1 shows the relationship between the contact angle between the UV-cured coating film and the inkjet color filter ink, and the results when the color filter ink was filled.

  The place where the color filter ink overflow occurred at a solid content ratio of 10% was an area sandwiched between two relatively narrow gaps in the width direction. Therefore, it is considered that the cause of overflow (color mixing) occurred because the amount of color filter ink filled was higher than a predetermined value with respect to the height of the black matrix at the bank.

  Based on the above results, the relationship between the contact angle of the coating film on the black mat risk to the color filter ink and the filling amount at which overflow occurs was investigated. Table 2 shows the results. However, since a contact angle of 40 degrees was not obtained with FS-710, it was realized using a fluorine-based ink repellent F-200 (manufactured by NOF Corporation). Moreover, the cause of the overflow was not able to be suppressed, and the limit was shown.

  It is possible to increase the NV of the inkjet ink for the color filter to 20% or more. Therefore, if five times the volume of the pixel formation portion surrounded by the black matrix can be filled by the ink jet method, a color filter in which the thickness of the black matrix and the thickness of the color material are the same can be formed. According to Table 2 above, when the contact angle is set to 35 degrees, it is possible to fill the color filter ink with 5 times the amount. Therefore, by the method of the present invention, a preferable shape in which the thickness of the black matrix and the color material are equal. The color filter can be obtained. Usually, the thickness of the black matrix may be thinner than the thickness of the color material, and the method of the present invention can be used sufficiently.

  As described above, even if the color filter ink is filled in the pixel forming portion surrounded by the black matrix partition formed by the method of the present invention, the color filter ink does not get over the partition, and the color filter is filled. A black matrix that can be formed with a uniform thickness without forming a convex shape can be realized with a simple process and a simple material, and an ink jet black matrix and a color filter can be provided at a low cost. .

  In FIG. 3, the contact angle θ with respect to the color filter ink 10 (R, G, B) is shown.

It is explanatory drawing which shows the process of manufacture of the color filter which concerns on this invention. It is explanatory drawing which shows the black matrix formation process in the color filter which concerns on this invention. It is explanatory drawing which shows typically the contact angle with respect to the ink for color filters of the layer which is an ink repellency processing surface.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Transparent substrate 2 ... Partition 8 ... Opening part 9 ... Layer 10R, 10G, 10B ... Ink

Claims (14)

  A color filter having at least a plurality of colored portions and a partition located between adjacent colored portions on a transparent substrate, wherein the partition is made of a resin composition formed on a transparent substrate, and the coloring The part is formed by curing color filter ink, which is colored ink filled by an ink jet method in the opening surrounded by the partition, and the opening is filled with the partition and the color filter ink. The color filter according to claim 1, wherein the entire surface is a treated surface having a contact angle of 10 to 30 degrees with the color filter ink to be filled.   The treated surface is a layer formed by applying, drying, and curing a transparent resin paint having a contact angle of 10 to 30 degrees with respect to the color filter ink to be filled after coating, drying, and curing. The color filter according to claim 1, wherein:   The composition of the transparent resin paint is an ink-repellent ink that is compatible with the resin content of the color filter ink to the paint obtained by removing the color pigment from the same color filter ink as the color filter ink to be filled and imparting photocurability. The color filter according to claim 2, wherein a color imparting agent is added.   4. The color filter according to claim 3, wherein the ink repellency imparting agent added to the transparent resin paint is a silicone resin type.   The color filter according to claim 1, wherein the partition wall is a light shielding layer.   The color filter according to claim 1, further comprising a protective layer on the colored portion formed by curing the color filter ink filled in the opening.   The color filter according to claim 1, wherein the color filter has a transparent conductive film on a surface thereof.   It is a manufacturing method of the color filter as described in any one of Claim 1 to 7, Comprising: Forming the photosensitive resin composition layer on a transparent substrate, After pattern exposure with respect to this photosensitive resin composition layer, A step of forming a partition pattern by development, a step of forming a partition by irradiating the partition pattern with light and photocuring, and a transparent ink-repellent portion in the partition and the opening surrounded by the partition Applying and curing a curable transparent resin coating containing a property-imparting agent to form the surface of the ink-repellent partition wall and the surface of the ink-repellent opening with respect to the color filter ink to be filled, and an inkjet method And a step of filling a color filter ink into the opening to form a colored pixel.   By the above-described step of forming the surface of the ink-repellent partition wall and the surface of the ink-repellent opening with respect to the color filter ink to be filled, the contact angle between the surface of the partition and the surface of the opening with respect to the color filter ink to be filled The method for producing a color filter according to claim 8, wherein the surface is a surface that is 10 to 30 degrees.   The method for producing a color filter according to claim 8 or 9, wherein the transparent resin paint is photocured and photocured.   The method for producing a color filter according to claim 8 or 9, wherein the transparent resin paint is thermosetting and heat-cured.   The surface of the partition and the surface of the opening have a contact angle of 10 to 30 degrees with respect to the color filter ink to be filled by adjusting the kind and amount of the ink repellency imparting agent added to the transparent resin paint. The method for producing a color filter according to any one of claims 8 to 11, wherein:   The supply amount of the color filter ink to be filled is up to twice the volume surrounded by the partition wall when the contact angle between the partition wall surface and the opening surface with respect to the color filter ink is 10 degrees. The ink supply amount is up to 3.5 times when the contact angle between the partition wall surface and the opening surface with respect to the color filter ink is 20 degrees, and the supply amount of the color filter ink to be filled is The method for producing a color filter according to any one of claims 8 to 12, wherein the contact angle between the surface of the partition wall and the surface of the opening with respect to the ink is up to 5 times when it is 30 degrees.   The manufacturing method of the color filter as described in any one of Claims 8-13 which forms the said partition with a black resin composition.

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