JP2007078805A - Method of fabricating color filter with flat surface - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a color filter of which the surface is perfectly flat by fabricating the color filter by using a method of forming BM layers by transfer method and individually inking gaps between the BM layers with an ink for the color filter. <P>SOLUTION: The method of forming the color filter of which the surface is perfectly flat includes: (1) filling an intaglio printing for transfer for BM formation with a black matrix member; (2) transferring the BM portion on a flat substrate for transfer via an overcoat layer material having a hardening adhesive property; (3) filling the space between the BM portions with coloring materials of the color filer with an ink jet method; and (4) transferring a BM+CF+overcoat layer to a glass substrate for the color filter via an adhesive having a hardening adhesive property. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a low-cost manufacturing method of a color filter used in a liquid crystal display device, and more particularly to a method of manufacturing a color filter having a flat surface suitable for use in an IPS (In-Plane Switching) type liquid crystal display device.

Recently, liquid crystal televisions have begun to spread rapidly, and the screen size has increased, and there has been a strict demand for improvement in display image quality and price reduction.
Regarding the quality of the display image, it is disclosed in Patent Document 1 as a liquid crystal display device using the birefringence effect of a liquid crystal material, which has less viewing angle dependency of display contrast ratio characteristics than a TN liquid crystal display device. The development of such an IPS liquid crystal display device has been actively promoted. In the case of the IPS type, an overcoat layer is generally formed on the surface of a color filter formed by a photolithography method for the purpose of uniforming the electric field distribution and preventing the diffusion of impurities.

On the other hand, for cost reduction, for color filters used in liquid crystal displays, a photolithographic method, which is a conventional method, is expensive, and a method of filling color material ink with an ink jet method is promising for cost reduction. As being considered. However, as long as the method of forming the black matrix (BM: light shielding portion between pixels) is the photolithography method, it is difficult to significantly reduce the cost. As a method for forming the BM at a low cost, a transfer method has been proposed.

A method of curing the material filled in the recesses and transferring the material to the target substrate through an adhesive is referred to herein as a transfer method. As a method of forming a BM by a transfer method, for example, in Patent Document 2, (1) a transfer intaglio having a recess corresponding to the BM portion is used, and (2) a BM material is filled in the recess by an inkjet method or the like. (3) Next, a resin layer is formed on the intaglio, and (4) a BM is formed by peeling the BM layer and the resin layer together from the intaglio. After that, the color material ink is filled in the concave portion formed by the BM layer and the resin layer to form a color filter. The BM layer and the resin layer play a role of a bank in order to prevent the color material ink from spreading outside a predetermined region when the color material ink is inked by ink jetting. The height of the bank needs to be a height at which the inkjet ink does not overflow. However, since the solvent content of the color ink for inkjet is usually 80% or more, the thickness of the CF layer is 1/5 after the solvent is volatilized. Since it becomes thinner below, the height of the BM portion becomes higher than necessary. In order to make the height of the BM portion as low as possible, for example, in Patent Documents 3 and 4, etc., the surface of the BM material is made ink repellent, and ink jet ink is filled more than the height of the BM portion at the time of ink jet inking. To be able to.

The inventors of the present application have improved this method, making the intaglio plate for transfer flexible, and regarding the structure and composition of the BM material in Japanese Patent Application No. 2004-277190. A creation method was proposed.
However, even if the solvent is volatilized in this way, the height of the BM becomes considerably higher than the height of the CF portion (colored portion), and the overcoat layer is made of the CF layer as in the case of CF formation by photolithography. Even if it was formed by coating on top, the smooth surface required for IPS CF was not obtained. The reason is that the thickness of the applied overcoat layer differs at least between the CF part and the BM part, so that even if it is applied flat at the beginning, after the solvent is volatilized, irregularities occur on the surface. .
In this regard, for example, Patent Document 5 discloses a composition of an overcoat layer excellent in surface flattening. However, the step between the BM portion and the CF portion in the case of a color filter formed by the ink jet method is about 1 to 3 μm, and even such an overcoat material excellent in flattening is required for the IPS CF. It was difficult to achieve surface flatness (usually <0.1 μm).

  On the other hand, several methods for producing a color filter having a flat surface have been proposed. Patent Document 6 discloses a method in which BM and CF are formed on a transfer flat substrate by a photolithography method and transferred to a color filter glass substrate using an adhesive.

Further, in Patent Documents 7 and 8, “convex part + bottom part” is formed by a press method, and each color material ink is filled into a predetermined concave part defined by the convex part by an ink jet method or the like, and then an adhesive is applied. A method is disclosed in which a “convex portion + bottom side portion” and a portion on the “convex portion + bottom side portion” are peeled integrally from a transfer flat substrate (base). The problem with this method is that the convex portion is made of the same material as the bottom portion, and thus it is difficult to provide the convex portion with light shielding properties. In order to impart light-shielding properties to the convex portions, a method of infiltrating the light-shielding substance into the convex portions formed by pressing, or a method of superimposing a light-shielding pattern on the upper portions of the convex portions can be considered. Sometimes it is necessary and difficult.

  Further, in Patent Document 9, a base layer is provided on a master (a flat substrate for transfer in the present application), and a BM portion and a CF portion formed thereon are lowered onto a color filter substrate using an adhesive. A method of transferring from a portion of the formation is disclosed.

Further, in the liquid crystal display device, the thickness of the liquid crystal layer is defined by a spacer. Conventionally, it has been defined by so-called bead balls, but recently, a photosensitive resin spacer formed by a photolithography method has been used. In the IPS liquid crystal display device, the specification value of the thickness of liquid crystal and the unevenness thereof is stricter than in the case of the normal TN system. This photosensitive resin spacer is usually formed after forming a color filter portion and then depositing ITO. For this reason, the number of processes is increased, which is one of the causes of high cost.
JP-A-7-159786 JP-A-11-202115 Japanese Patent Laid-Open No. 06-118217 JP 09-230127 A JP 2000-28824 A Japanese Patent Laid-Open No. 7-294717 JP-A-9-171107 JP-A-11-183721 Japanese Patent Laid-Open No. 10-148710

A method of creating the BM portion itself by the transfer method is promising as a low-cost manufacturing method, but a method of flattening the CF surface when using a BM formed by the transfer method is not known. An object of the present invention is to provide a method for flattening the CF surface. Another object of the present invention is to provide a method for forming a so-called photo spacer at a low cost in a color filter for forming a BM portion by a transfer method.

The invention described in claim 1
A color filter creating method characterized in that at least the following steps are sequentially performed.
(1) A step of filling the concave portion of the flexible intaglio plate having a concave portion corresponding to the BM pattern with a BM material and curing it.
(2) A step of facing the transfer intaglio filled with the BM material and the transfer flat substrate and sandwiching a curable overcoat material therebetween.
(3) A step of transferring the overcoat material and the BM material integrally from the transfer intaglio to the transfer flat substrate after curing the overcoat material.
(4) A step of filling a predetermined color filter color material ink in each of the concave sections formed by the BM material and the overcoat material transferred to the transfer flat substrate, and curing.
(5) A step of aligning the cured color material ink side on the flat transfer substrate and the color filter substrate, sandwiching a solventless photosensitive curing transparent adhesive therebetween, and exposing and curing the adhesive.
(6) A step of peeling the color filter substrate and the transfer flat substrate from the end, and transferring the cured color material ink and the cured adhesive integrated to the color filter substrate side. .

The invention described in claim 2
The method of filling the recesses of the flexible transfer intaglio with the BM material uses a transfer intaglio that can be exposed from the back side, and adjusts the exposure amount to adjust the BM thickness to a desired thickness. The method for producing a color filter according to claim 1, wherein:

The invention according to claim 3
3. The method for producing a color filter according to claim 1, wherein a flat substrate for transfer with a spacer forming portion is used as the flat substrate for transfer.

The invention according to claim 4
The method for forming a color filter according to claim 1, wherein the overcoat material is a solvent-free UV curable type.

The invention described in claim 5
Following the step (4), after the color material ink is filled, the step of pressing the ink while it is flexible to flatten the surface of the color material ink and then solidify is performed. Item 5. A method for forming a color filter according to any one of Items 1 to 4.

According to the first aspect of the present invention, even when a color filter is manufactured by a method in which a BM layer is formed by a transfer method and the color filter ink is individually inked between the BM layers, the surface is completely flat. Color filters can be created. In this case, since the intaglio for transfer for forming the BM and the flat substrate for transfer are flexible, the peeling process can be performed smoothly.

According to invention of Claim 2, the thickness of BM material can be made into desired thickness with high precision by adjusting the light quantity of back surface exposure.

According to the invention of claim 3, the photo spacer (column spacer) having excellent thickness accuracy can be formed simultaneously with the formation of the smooth overcoat layer. If an adhesive for overcoat material is used, the surface of the color filter has characteristics necessary for an overcoat layer.

According to invention of Claim 4, the process of bonding hardening can be made into a short time.

According to the invention of claim 5, unevenness in the thickness of the color material layer can be reduced. Thickness unevenness countermeasures such as selection of ink repellent materials and measures against bleeding of ink repellent materials can be reduced.

First, a method for forming a color filter having a very flat surface (according to claim 1) according to the method of the present invention will be described below with reference to FIGS.
FIG. 1 (1): The concave portion of the intaglio plate for transfer has a concave portion corresponding to a desired BM pattern and the like. The intaglio plate for transfer is filled with a UV curable BM material lower than the light shielding layer (convex portion). After the solvent is volatilized, UV curing is performed. Here, as a method of filling the BM material, for example, there is a method disclosed in Japanese Patent Application No. 2004-277190.
Although it is a well-known method, a BM serving as a bank uses a CF ink-repellent property for ink-repellent ink jet so as to be convenient for filling a CF material (color material ink) by an ink jet method. The structure and material of the transfer intaglio and the method of filling the recess with the BM material will be described later.

FIG. 1 (2): CF curable adhesive with CF ink property for parent ink jet having a function as an overcoat between the transfer intaglio filled with BM prepared in FIG. 1 (1) and a flat substrate for transfer The (overcoat adhesive) is sandwiched by, for example, a roll press so as to have a predetermined thickness. The material and structure of the transfer flat substrate will be described later.

FIG. 1 (3): UV light is irradiated from the transfer flat substrate side to cure the overcoat adhesive.

FIG. 1 (4): When peeling off, it is preferable that the transfer substrate is flat to prevent defects and to ensure dimensional accuracy. Therefore, it is fixed flat with a vacuum suction surface plate or the like. When the transfer flat substrate is fixed, the transfer intaglio is lifted from the end, and peeled off, the ink-repellent ink-repellent BM material is transferred to the transfer flat substrate side via the overcoat adhesive.

FIG. 2 (5): CF color material ink is filled between BM materials by an ink jet apparatus.
Since the ink repellent BM material is used, the CF color material ink can be filled more than the height of the BM material.

FIG. 2 (6): A solventless UV curable adhesive is sandwiched between a material filled with a CF material and a glass substrate for a color filter with a roll laminator or the like at a predetermined thickness and bonded.

FIG. 2 (7): UV is irradiated from the color filter glass substrate side to cure the solventless UV curable adhesive.

Fig. 2 (8): When the glass substrate for the color filter is fixed by vacuum suction or the like, and the flat substrate for transfer is lifted while being bent from the end, the space between the flat substrate for transfer and the UV curable adhesive layer for the overcoat layer Peels off.
In this way, an overcoat layer having a completely flat surface can be formed.

A method for forming the spacers simultaneously will be described below with reference to FIGS.
FIG. 3 (1): CF repellent BM material is filled into the recesses of the transfer plate for BM formation transfer in the same manner as in FIG. 1 (1).
FIG. 3 (2): In FIG. 1 (2), a transfer flat substrate is used, but instead a transfer substrate with a spacer forming recess is used. A method for producing the transfer substrate with the spacer forming recess will be described later. In the same manner as in FIG. 1 (2), the transparent non-solvent for the overcoat layer and spacer between the BM forming transfer intaglio filled with the BM material in FIG. 3 (1) and the transfer substrate with the spacer forming recess. Insert a UV curable adhesive. Since the adhesive is cured to become an overcoat layer, the adhesive is sandwiched while being adjusted by, for example, a roll press so that the thickness becomes a predetermined thickness. The adhesive enters the recess for forming the spacer of the intaglio plate for transfer, but it is necessary to sandwich the adhesive so that no bubbles remain in the recess for spacer. Therefore, it is preferable to use a vacuum laminator, for example. Thereafter, the adhesive is cured by irradiating UV from the transfer substrate side.
FIG. 3 (3): The transfer substrate and the transfer intaglio are peeled off. The peeling is performed in the same manner as in FIG.
FIG. 3 (4): Color materials R, G, and B are filled into a predetermined pixel portion (concave gap) by, for example, an inkjet method.
FIG. 4 (5): The color filter ink filled between pixels is flexible when it contains a solvent, but when it is in an appropriate flexible state, it is pressed to reduce the thickness of the color material layer. Flatten. The pressing method is a method in which the surface is releasable, for example, by sequentially pressing from the end with a roll coated with silicone rubber or fluororesin, or by pressing a silicon rubber plate as a cushioning material with a flat press or a hydraulic press. There are methods. This step can also be performed when no spacer is formed, that is, between (5) and (6) in FIG.
FIG. 4 (6): A solvent-free UV curable transparent adhesive is sandwiched between a transfer substrate filled with a color material and a color filter glass substrate.
FIG. 4 (7): UV is irradiated from the color filter glass substrate side to cure the adhesive.
FIG. 4 (8): When the transfer (flat) substrate and the color filter glass substrate are peeled off, peeling occurs between the transfer (flat) substrate and the overcoat layer. The spacer portion is also transferred to the overcoat layer side. Thereafter, necessary processing such as heat treatment is performed to complete the color filter.

Next, each member used in the present invention will be described below.
FIG. 1 (1) is a schematic cross-sectional view of a transfer intaglio used in the present invention. As a support substrate, a glass substrate for a color filter, and a coefficient of thermal expansion, which can satisfy the specification of dimensional accuracy, are shown. There is a nearly matching iron-nickel 42 alloy. In addition, there are quartz glass and invar whose thermal expansion coefficient is close to zero. It is preferable to bend at the time of transfer in order to smoothly perform the peeling process. A thickness having flexibility is sufficient, but in the case of quartz glass or a color filter glass substrate, a thickness of 0.7 to 5 mm is preferable. Even if the glass plate for a color filter becomes large, it is preferable because it can be easily obtained. In that case, the thickness is 0.7 mm, but when the size becomes large and the strength is insufficient, a plastic film is bonded and reinforced.
The release layer needs to be ink-philic to such an extent that the BM ink can be filled inside. However, in order to impart resilience to the color filter ink, for example, a surfactant that lowers the surface energy of the silicone resin or fluororesin is added to the BM ink. Even if a fluororesin surfactant is added or the surface is coated, it is possible to obtain temporary wettability.
The convex portion can be formed using a photoresist. In order to impart ink repellency, an ink repellant is added to the photoresist or a convex pattern is formed, and then an ink repellant substance such as silicone resin or fluororesin is applied to the surface and cured. . Moreover, you may form a metal convex part by pattern plating. Chrome plating is preferable because of its high hardness and ink repellency.
Note that the convex portions may be formed first, and the release layer and the ink repellent layer on the surface may be formed later.

FIG. 5 shows a method for producing a transfer substrate for simultaneous spacer formation. The reason for using the glass substrate is to perform UV exposure through the glass substrate, and is the same as that of the flat substrate for transfer used in claim 1. As the UV curable release material, an acrylic resin-based photosensitive curable material can be used. According to this method, the depth of the concave portion for forming the spacer is equal to the coating thickness of the UV curable release material, and thus is highly accurate. In addition, the shape of the spacer is usually cylindrical, and the size is about several μm in diameter and about 2 to 5 μm in height.
In FIG. 3B, the overcoat resin enters the spacer portion of the transfer flat substrate. However, if the overcoat resin is inappropriate as a spacer, the material for the spacer is first filled in the spacer hole of the flat substrate for transfer, and then the process of FIG. It is good to do. When the material is UV curable, the curing can be performed simultaneously with the curing of the overcoat layer. However, when the material is not UV curable, the material is cured after filling, and is cured as shown in FIG. Perform the process.

An example of a method of filling the transfer intaglio with BM ink is shown in FIG. FIG. 6 (1) shows a method of filling BM ink into the recesses of the transfer intaglio using a doctor. As the BM ink, a solventless type or a low solvent type, which has a small volume reduction after solidification and curing, is suitable. In order to prevent the BM ink from remaining on the convex part of the transfer intaglio, even if it is embedded with a doctor, the convex part surface is made to be a hard surface such as a chrome plated surface, or the doctor is moved with high pressure, Alternatively, the surface of the convex portion is coated with a silicone resin or a fluorine resin to increase the ink repellency with respect to the BM ink.
In FIG. 6 (2), a transfer intaglio that allows backside exposure is used. That is, using a color filter glass substrate or a quartz glass plate as the support substrate, it is possible to expose from the back surface. In practice, a glass substrate for a color filter as a supporting substrate for an intaglio plate for transfer is a very preferable material from the viewpoint of the coefficient of thermal expansion and the ability to easily cope with a large size.
The release layer also needs to transmit the back exposure light to some extent. As the actual material, a transparent plastic film such as polypropylene, polycycloolefin, transparent polyimide, and UV-curing acrylic resin-based material is preferable because it is easy to form a convex portion thereon. A UV-curable acrylic resin-based resin can be sufficiently peeled by performing a heat treatment at 150 to 250 ° C. for about 5 to 30 minutes after UV curing. The convex portion can be formed using a light-shielding photoresist. For example, an ink for which about 0.01 to 1% of an ink repellent agent is added to BM ink can be used. If it is an acrylic resin-based BM ink, it has a releasability with respect to a state in which the same BM ink is filled and cured by performing a heat treatment at 150 to 250 ° C. for about 5 to 30 minutes. . Also, it adheres to the underlying release layer.
As shown in FIG. 6 (2) 2), the BM ink is applied to the entire surface of the plate as a method of filling the intaglio plate for transfer for backside exposure with BM ink. As a coating method, methods such as roll coating, slit coating, and spin coating can be used. After the solvent is volatilized, exposure is performed from the back side. Then, the portion without the light shielding portion is a portion corresponding to a desired BM pattern, but the portion is cured according to the exposure amount. Exposure from the back side until the thickness of the BM material reaches the desired thickness. Even when exposed, the BM ink on the light-shielding portion does not cure. When developed, the cured BM ink remains in the recesses of the plate, and the others are removed. The advantage of the back exposure method is that the thickness of the BM ink to be cured is determined not by the thickness of the applied BM ink but by the exposure amount. When the area is large, it is difficult to apply a uniform thickness, but it is easy to make the exposure amount uniform.
In the method shown in FIG. 6 (3), 1) a removable coating layer is formed on the convex portion, 2) BM ink is applied to the entire surface, dried, and then exposed from the entire surface. Cure the ink. 3) The method is such that when the covering material is removed, the concave portion is filled with a cured product of BM ink. Examples of the material of the coating layer include water-soluble resins (PVA, cellulose resin, etc.), silicone resins and fluororesins, resins that dissolve in solvents that do not dissolve UV cured BM ink, and the like. Examples of the method for covering only the surface of the convex portion include a back exposure method, a thermal transfer method, and an adhesive transfer method. Silicone resin and fluororesin are advantageous because they can remain on the plate side even after the cured BM ink is transferred and can be used many times. The BM ink may be photosensitively curable, but may be thermosetting or two-component curable.

The transfer flat substrate includes a support substrate and a release layer. The support substrate must be UV transmissive when using an UV curable overcoat material with adhesive properties. From the viewpoint of thermal expansion, quartz glass with almost no thermal expansion near room temperature is used. It is preferable to use a glass substrate for a color filter or to make the thermal expansion and contraction near the working temperature the same in order to increase the dimensional accuracy. In particular, the latter is preferable because it can cope with an increase in the size of the color filter substrate. Although it is highly preferable that it is flexible at the time of peeling, the glass plate for the color filter has a thickness of 0.7 mm at present, so there is no problem with flexibility. On the other hand, breakage is dealt with by a reinforcing method used for laminated glass, for example.
Since the transfer flat substrate requires an appropriate adhesive force with an adhesive and an appropriate release property, a release material layer is formed on the surface. As a practical matter, since the transferred layer is transferred once using an adhesive, the adhesive strength should not be higher than the transfer using a later adhesive.
That is, in the method of the present invention, since there are two mold release steps, the peeling force required for the mold release in the mold release step from the first transfer intaglio is the second mold release step from the transfer intaglio flat substrate. It is necessary to be considerably lower than the peeling force required for mold release. Here, in the first mold release, it is necessary to be a material suitable as a BM material, and in the second mold release, it is necessary to be a material suitable for an overcoat. Difficult to think. Therefore, adjusting the three factors of the mold release property of the transfer intaglio and the transfer flat substrate and the adhesive strength of the adhesive, the adhesive strength of the adhesive> the adhesive strength of the release layer of the transfer intaglio> the release layer of the transfer substrate It is necessary to have an adhesive strength. For this purpose, the release layer of the intaglio plate for transfer needs to have a high release property for the BM material to be filled and solidified. In the intaglio plate for transfer, it is preferable to cover the surface with a silicone resin or a fluororesin to form a release layer.

As the BM material, a photosensitive curable material using normal carbon black or titanium black as a black light shielding material can be used. In order to impart ink repellency to the ink-jet CF ink, commonly used ones such as acrylic-silicone copolymers described in JP-A-2004-45910, JP-A-2004-177948, JP-A-2005-60515 are used. Etc. As an inking method of CF ink for each pixel, there is a nozzle method in addition to the ink jet method. The BM formed by the method of the present invention can also be used for the nozzle method. Moreover, the ink repellent agent in that case can use what is used for an inkjet method.

The overcoat material is usually a thermosetting and solvent-containing composition as described in, for example, Patent Document 5, but in the case of the UV curable composition used in the present invention, it is a solvent-free composition. Is very suitable. The method of obtaining it is basically changing the polymer component to an oligomer component or monomer component for the composition of what is usually used, and adding a photoinitiator to impart photosensitivity, It can be changed to a solventless type. Further, this overcoat material is preferably ink-philic with respect to the ink-jet CF ink. What is described in Patent Document 5 is ink-philic.

As the release layer for the overcoat material, that is, the release layer of the flat substrate for transfer, a chromium-cured PVA, an acrylic resin system, an acrylic melamine resin system, or the like is preferable because it does not contaminate the surface of the overcoat layer. On the other hand, a silicone resin or fluororesin having a high releasability is difficult to use because it is equal to or lower than the peel strength at the time of releasing the intaglio for transfer. Further, there is a risk of contamination of the overcoat layer.

The adhesive for transferring to the color filter substrate must be colorless, have high adhesive strength to the color filter glass, and can withstand the color filter resistance test. The solventless type is very preferable in the process. Furthermore, it may be heat curable or two-component mixed curable, but is preferably a UV curable solventless type. As an actual composition, there is an acrylic solventless UV curable type. For example, the one disclosed in Japanese Patent Application Laid-Open No. 2000-136354 is preferable because it can be removed with an alkaline developer without exposing a portion that does not require curing.

Explanatory drawing of the process (first half) of 1 Embodiment of this invention. Explanatory drawing of the process (latter half) of one Embodiment of this invention. Explanatory drawing of the process (first half) of other one Embodiment of this invention. Explanatory drawing of the process (second half) of other one Embodiment of this invention. Explanatory drawing of the production method of the flat board | substrate for transfer used when forming a spacer simultaneously. Explanatory drawing of BM ink filling method to transfer intaglio

Claims (5)

A method for producing a color filter, comprising performing at least the following steps in order.
(1) A step of filling the concave portion of the flexible intaglio plate having a concave portion corresponding to the BM pattern with a BM material and curing it.
(2) A step of facing the transfer intaglio filled with the BM material and the transfer flat substrate and sandwiching a curable overcoat material therebetween.
(3) A step of transferring the overcoat material and the BM material integrally from the transfer intaglio to the transfer flat substrate after curing the overcoat material.
(4) A step of filling a predetermined color filter color material ink in each of the concave sections formed by the BM material and the overcoat material transferred to the transfer flat substrate, and curing.
(5) A step of aligning the cured color material ink side on the flat transfer substrate and the color filter substrate, sandwiching a solventless photosensitive curing transparent adhesive therebetween, and exposing and curing the adhesive.
(6) A step of peeling the color filter substrate and the transfer flat substrate from the end, and transferring the cured color material ink and the cured adhesive integrated to the color filter substrate side. .   The method of filling the recesses of the flexible transfer intaglio with the BM material uses a transfer intaglio that can be exposed from the back side, and adjusts the exposure amount to adjust the BM thickness to a desired thickness. The method for producing a color filter according to claim 1, wherein:   3. The method for producing a color filter according to claim 1, wherein a transfer flat substrate with a spacer forming portion is used as the transfer flat substrate. The method for forming a color filter according to claim 1, wherein the overcoat material is a solventless UV curable type. Following the step (4), after the color material ink is filled, the step of pressing the ink while it is flexible to flatten the surface of the color material ink and then solidify is performed. Item 5. A method for forming a color filter according to any one of Items 1 to 4.

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