JPH108294A - Formation of colored pattern - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method capable of stably forming colored patterns which are fine and have excellent long-term performance with a smaller number of stages. SOLUTION: This method for forming the colored patterns has (1) a stage for forming colored coating films 3 by electrodeposition coating of colored electrodeposition coating materials on the striped transparent electrodes 2 of a transparent substrate 1 having the striped transparent electrodes 2 on the surface, (2) a stage for removing the parts irradiated with a laser beam by irradiating the colored coating films in the stripe form with the laser beam to a pattern form by a laser abrasion method in such a manner that the parts not having the colored coating films are formed to a grid shape, (3) a stage for embedding the grid parts not having at least the colored coating films by applying a black coating material on the colored coating film surface of the substrate, (4) a stage for curing the coating films 6 of the black coating material embedded in the grid parts, and (5) a stage for removing the unnecessary coating films 6 of the black coating material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for forming a colored pattern by combining a pattern electrodeposition method and a laser ablation method, and more particularly to a method for forming a colored pattern suitable for manufacturing a color filter, and a method for forming a colored pattern. Color filters to be used.

[0002]

2. Description of the Related Art
In the production of a color filter, a method of forming a multicolored pattern is as follows: (1) Repeating coating, exposure and development using a colored resin composition of a plurality of colors in which a pigment or dye is dispersed in a photosensitive resin. A so-called “pigment dispersion method”, (2) forming a colored layer based on a polymer layer by electrodeposition on a specific transparent electrode of a substrate having a metal oxide transparent electrode disposed thereon, A so-called “pattern electrodeposition method” in which another colored layer is formed on an electrode by electrodeposition.
(3) A method called "printing method" in which a plurality of colored pastes are printed in a pattern on a substrate. (4) A photosensitive resist film is formed on the surface of the substrate. A colored layer is formed on the exposed substrate surface by peeling into a predetermined pattern by a photolithographic method, and then the photosensitive film in an adjacent region is peeled into a predetermined pattern by a photolithographic method and is different on the exposed substrate surface. A method called a "resist direct method" in which a colored layer is repeatedly formed. (5) A water-soluble photosensitive resin is coated on a support to form a relief image, and then colored by dyeing with a dye. A so-called “dyeing method”, which forms a multicolored layer by repeatedly providing layers, can be used.

However, in the method (1), coating, exposure, and development are repeatedly performed, so that the number of steps is increased and the defect rate is increased. In addition, since the pigment is dispersed in a special photosensitive resin, the dispersibility of the pigment is reduced. However, there is a problem that the curability at the time of exposure is reduced, and that the transparency of the obtained colored layer is apt to be reduced. The method (2) has an advantage that the number of steps is small and a colored layer can be easily formed even on a large-sized substrate. However, the necessity of wiring to the disposed transparent electrode requires the shape of the transparent electrode. Are generally limited to stripes, and the shape of the resulting colored pattern is generally limited to stripes. In the method (3), it is difficult to form a fine multi-colored layer. In the method (4), since the exposure and development of the photosensitive resist film are repeatedly performed, the photosensitive resist film must have resistance to repeated exposure and development, but the pattern shape is likely to be deteriorated by the repeated exposure and development. There is. In the method (5), photosensitivity,
Problems such as difficulty in controlling the process due to instability of coloring by the dye, poor thermal stability, and poor adhesion to the substrate are likely to occur.

[0004] In any of the above (1) to (5), there is the above-mentioned problem, and a color pattern having a multicolored layer fine and excellent in long-term performance can be stably formed in a small number of steps. A way was sought.

[0005]

The inventors of the present invention have conducted intensive studies to obtain a method capable of stably forming a fine colored pattern having excellent long-term performance in a small number of steps. A laser is applied to the colored coating obtained by the deposition method in a pattern by a laser abrasion method to remove the laser-irradiated portion, so that the portion without the colored coating becomes a lattice, and the portion without the colored coating It has been found that the above-mentioned object can be achieved by forming a black paint film on the substrate, thereby completing the present invention.

That is, the present invention provides: (1) a step of forming a colored coating by electrodepositing a colored electrodeposition coating on a transparent electrode of a substrate having a transparent electrode patterned on its surface, (2) no colored coating The colored coating film formed in a stripe pattern is irradiated with laser light in a pattern by laser abrasion in a direction substantially perpendicular to the longitudinal direction of the striped colored coating so that the portions become a lattice. (3) a step of applying a black paint on the surface of the substrate on which the colored coating is provided, and filling at least a grid-shaped portion without the colored coating, (4) filling the grid-shaped portion A step of curing the obtained black paint film and (5) a step of removing the unnecessary black paint film, wherein a grid is provided between the colored films on the substrate. Black coating film ( Method of forming a colored pattern comprised of rack matrix) and is intended to provide.

[0007] The present invention also provides: In the step (1), a plurality of colored electrodeposition paints are used as the colored electrodeposition paint, and a plurality of color coatings are formed on the transparent electrode by electrodeposition coating a plurality of times. Item 4 provides a method for forming a colored pattern according to Item 1.

[0008] The present invention further provides: The color of the colored pattern according to Item 2, wherein the colors of the plurality of colored electrodeposition paints are three colors of red, blue and green, and form four colored patterns of red, blue, green and black (black matrix). The present invention provides a forming method.

[0009] The present invention also relates to 4. The black paint is an actinic ray-curable black paint, and provides the method for forming a colored pattern according to any one of the above items 1 to 3, wherein the black paint film is cured by actinic light in step (4). It is.

[0010] Further, the present invention provides: Item 4. The method according to item 4, wherein in the step (4), the actinic ray is irradiated from the back surface of the transparent substrate, and the actinic ray passes through the transparent substrate to cure the black paint film embedded in the lattice portion. It is intended to provide a method for forming a colored pattern.

[0011] The present invention also relates to 6. It is intended to provide a color filter, wherein four colored patterns are formed on a transparent substrate for a liquid crystal display device by the forming method described in the above item 3.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION As a substrate having a transparent electrode patterned in a stripe shape on the surface used in the present invention, a thin film of a transparent metal, indium oxide, tin oxide or the like is formed on a surface of a glass or resin substrate. The transparent electrode on the surface of the substrate obtained by forming the substrate by a sol-gel method, sputtering, vapor deposition, CVD or the like is patterned into a stripe. It is preferable that the width of the stripe of the transparent electrode is usually 10 to 100 μm, and the space width between the stripes is usually 5 to 50 μm.

In the step (1) of the method of the present invention, a colored coating film is formed on the transparent electrode of the substrate by electrodepositing a colored electrodeposition paint. To form a colored coating,
The stripes of the transparent electrode forming the colored coating film may be wired so as to be energized, immersed in a colored electrodeposition paint, and energized for electrodeposition coating. As a result, a colored coating film of one color is formed on one or more stripes of the transparent electrode. On the remaining stripes, one or more colored coatings of other colors can be similarly formed.

When a color filter is manufactured, a transparent substrate is used as a substrate, and usually, a colored coating film of three colors of red, blue and green and a black matrix which is a black coating film are formed. In order to form three colored coatings of red, blue and green,
For example, a substrate is immersed in a red electrodeposition paint, and a red coating is formed by applying a current to a stripe wiring forming a red coating.
Heat and cure as needed. Next, the substrate is immersed in a blue electrodeposition paint, and a current is applied to the striped wiring forming the blue film to form a blue film, and then heat-cured if necessary.
Further, a colored coating film of three colors can be formed by a method of forming a green coating film in the same manner.

The thickness of the colored coating film formed is not particularly limited, but is usually about 0.5 to 5 μm. Electrodeposition conditions vary depending on the electrode area.
The conditions are a voltage of 5 to 300 V and an electrodeposition time of 5 to 180 seconds.

The resin of the colored electrodeposition paint is not particularly limited as long as it is a resin that can be dissolved or dispersed in water and has an ionic group such as a carboxyl group, an amino group or an onium base in the resin. But heat resistance, light resistance,
It is preferable that the resin has good adhesion to the base material and good pigment dispersibility. Specific examples of the resin type include an acrylic resin, an epoxy resin, a polyamide resin, a polyurethane resin, a polyester resin, an alkyd resin, and a silicone resin. And the like. These resins may be used alone or as a mixture of two or more resins.

The coloring pigment to be dispersed in the resin is preferably a pigment having excellent heat resistance, chemical resistance, solvent resistance, and light resistance. Further, since an appropriate spectrum and transparency are required, an organic pigment may be used. Preferably, there is. The coloring pigments can be used alone or as a mixture of two or more. From the viewpoint of transparency and absorption coefficient of visible light, the particle diameter of the colored pigment in the colored resin coating material is preferably such that 95% by weight or more of the pigment is 300 nm or less, preferably 120 nm or less. It is effective to disperse the pigment by a known method using a roll or the like to improve the transparency and the absorption coefficient.

Examples of suitable pigments having excellent various resistances are shown by color index (CI) numbers.

Yellow pigment: C.I. I. 24, 83, 93, 9
4, 108, 109, 110, 117, 125, 13
7, 147, 153, 154, 166, 168 Orange pigment: C.I. I. 36, 43, 51, 55, 5
9, 61 Red pigment: C.I. I. 97, 122, 123, 149, 1
68, 177, 178, 180, 187, 190, 19
2,209,215,216,217,220,22
3, 224, 226, 227, 228, 240 Violet pigment: C.I. I. 19, 23, 29, 30,
37, 40, 50 Blue pigment: C.I. I. 15, 15: 1, 15: 3, 15:
4, 15: 6, 22, 60, 64 Green pigment: C.I. I. 7, 36 Brown pigment: C.I. I. 23, 25, 26 The colored electrodeposition paint may be composed of only the resin, the colored pigment and water, but may include an organic solvent, a neutralizing agent, a curing catalyst,
It may contain a pigment dispersant, an antifoaming agent, a coating surface modifier and the like, and is usually used as an electrodeposition bath having a solid content of 5 to 30% by weight.

In the step (2), a laser beam is applied to the colored coating formed in a stripe shape in the step (1) by a laser ablation method in a direction substantially perpendicular to the longitudinal direction of the striped colored coating. Then, the coating film on the laser-irradiated portion is removed so that a portion of the substrate without a colored coating film becomes a grid.

In the present invention, the laser abrasion method means “by irradiating an object with laser light,
A method of decomposing or evaporating and scattering a laser beam irradiation part of an object to a desired depth. "

As the laser beam used in the step (2), any laser beam can be used as long as it is a laser beam used in a laser abrasion method, and examples thereof include an excimer laser, a YAG laser, a carbon dioxide laser, and a semiconductor laser. Can be mentioned.

As a method of irradiating the colored coating film with laser light in a pattern, the laser light is narrowed down using an optical component such as a lens, and the narrowed laser light is patterned into a colored resin film based on CAD data and the like. Examples include a direct drawing method in which irradiation is performed, and a method in which a laser beam is passed through a stencil to form a pattern, and the pattern is irradiated to a colored resin film.

Irradiation of the colored coating film with laser light varies depending on the thickness of the colored coating film and the like, but usually, the energy density of one pulse is from 100 mj / cm ^{2 to} 5000 mj / cm.
^The irradiation can be suitably performed by irradiating about 1 to 100 pulses with the ^two pulse lasers.

In the step (3), a black paint is applied on the surface of the colored coating film of the substrate having the patterned colored coating film from which the portions without the colored coating film have been removed in the step (2) so as to form a lattice. It is applied to fill at least the grid-like portion without the colored coating.

The black paint can be used without particular limitation as long as it is a black paint capable of forming a coating film. The black paint may be an organic solvent type or an aqueous type. The same resin-based resin as the resin can be used. In order to obtain a black paint, a black pigment such as carbon black, acetylene black, lamp black, bone black, graphite, iron black, and aniline black may be blended as a black agent.

The black paint may be a thermosetting type or an actinic ray curable type. In the case of a thermosetting type, it is particularly preferable to remove excess black paint adhering on the colored coating film as much as possible.

In the step (4), the black paint film embedded in the lattice portion is cured. The curing method may be appropriately selected according to the type of the black paint, and examples thereof include heat curing and actinic ray curing. When the type of black paint is an actinic ray curable type, actinic rays such as ultraviolet rays can be irradiated from the back surface of the substrate, and the actinic rays can pass through the transparent substrate to selectively cure the black paint film.

The substrate formed through the above step (4) is
Since there is an unnecessary black paint film, the unnecessary black paint film is removed in step (5). When the unnecessary black paint film is hardened, the surface of the paint film on the substrate can be removed by polishing, for example. If the unnecessary black paint film is not cured, it can be removed by, for example, development. Both polishing and development can be used in combination.

Polishing is usually performed until the entire surface of each colored coating pattern is exposed. After the surface of the colored resin coating is smoothed by polishing, the entire surface of the colored resin coating is irradiated with laser light. The entire surface of each multicolored pattern may be exposed. Polishing can be performed by, for example, a general-purpose polishing machine. For example, in the case of using a color filter for a TFT liquid crystal display device, the surface roughness is 0.015 μm and the flatness is 0.5 μm or less. It is preferable that the surface is polished to a surface roughness of 0.03 μm and a flatness of 0.05 μm or less. By polishing the surface of the colored coating film, it is possible to simultaneously smooth the surface of the colored coating film and remove unnecessary black coating film.

A method of forming a color filter of four colors on a transparent substrate for a liquid crystal display device by using the method of the present invention to obtain a color filter will be described with reference to FIGS.

FIG. 1 is a model diagram of a cross section of a substrate, showing a process from forming a colored coating film on a substrate to forming a color filter. FIG. 2 is a model diagram of a plane of the substrate.

In FIG. 1, FIG. 1A shows a transparent substrate having a transparent electrode patterned in a stripe shape on the surface. For example, an indium oxide layer is formed on the entire surface of the transparent substrate by vapor deposition, and then photolithography is performed. It can be obtained by patterning the indium oxide layer in a stripe shape to form a transparent electrode.

FIG. 4B shows a state in which a first colored coating film (for example, a red coating film) is to be formed on the substrate shown in FIG. It is a model figure of what was immersed in a paint and applied with electricity, formed a coat, washed with water, and baked.

FIG. 3C shows the wiring of the substrate on which a second colored coating film (for example, a blue coating film) is to be formed on a predetermined striped transparent electrode on which no coating film is formed on the substrate of FIG. FIG. 7 is a model diagram of a substrate immersed in a second electrodeposition paint and energized to form a coating film, and then washed and baked.

FIG. 4D shows a state in which a third colored coating film (for example, a green coating film) is to be formed. FIG. 3 is a model diagram of a substrate immersed in a second electrodeposition paint and formed by applying a current to form a coating film, and then washed with water and baked; a three-color striped colored coating film is formed on the substrate; Figure (d)
FIG. 2-1 shows a plan view of the substrate on which the three-color striped coating film is formed.

In the substrate shown in FIG. 2A, the striped colored coating is applied so that the portion without the colored coating has a lattice shape.
FIG. 2-2 is a plan view of a pattern obtained by irradiating a laser beam in a pattern shape by a laser ablation method in a direction substantially perpendicular to the longitudinal direction of the striped colored coating film and removing a laser beam irradiated portion.

FIG. 7E shows a model diagram of a cross section of the substrate shown in FIG. 2-2 in which a black paint is applied to fill a lattice-like portion without a colored coating film on the substrate. The black paint is unavoidably formed not only on the grid-like portions but also on each colored coating film. The application of the black paint can be performed using a known method such as spin coating, screen printing, and application with a squeegee.

The black paint film embedded in the grid-like portion of the substrate to which the black paint is applied, as shown in FIG. The method for curing the black paint film may be appropriately selected, such as heat curing or actinic ray curing, depending on the type of the black paint film.

As a black paint, a paint curable by ultraviolet rays is used, an ultraviolet absorber is contained in each of the colored coatings other than black, and ultraviolet rays are irradiated from the back surface of the substrate to form a black paint on the lattice portion. The coating film can be cured so that the black paint film unavoidably formed on each colored coating film is not cured. Uncured and unnecessary black paint film can be removed by development. As a result, it is possible to obtain a substrate having three colored coating films and a black coating film formed in a lattice as shown in FIG.

When the black paint film is cured by irradiation with actinic rays such as ultraviolet rays, a cover coat layer for blocking oxygen is provided on the black paint film so as to prevent the curing from being inhibited by oxygen. Is preferred.

If the unnecessary black paint film formed inevitably is cured in addition to the black paint film in the grid portion by heating or the like, it is necessary to remove the unnecessary black paint film. This removal can be performed by polishing or the like, whereby a substrate having a colored coating film shown in FIG.

When a color filter is used, usually, red,
Four colors of blue, green, and black (black matrix) are used, and various colors can be used depending on the application.
The order in which the blue and green colored patterns are formed is not particularly limited and can be appropriately performed.

[0044]

The present invention will be described more specifically with reference to the following examples. Hereinafter, both “parts” and “%” are based on weight.

Production Example 1 of Colored Electrodeposition Coating The monomer composition is styrene / methyl methacrylate / n-
Butyl acrylate / n-butoxymethyl acrylamide / 2-hydroxyethyl acrylate / acrylic acid =
10/34 / 28.5 / 10/12 / 5.5 (weight ratio)
Is dissolved in a mixed solvent of isopropyl alcohol / n-butyl alcohol / ethylene glycol monobutyl ether / propylene glycol monomethyl ether = 20/25/15/40 (weight ratio). 10 parts of propylene glycol monomethyl ether and 2.7 parts of triethylamine (neutralization equivalent 0.6 parts) were added to 100 parts of a resin solution having a solid content of 51%.
9) was mixed. This mixed solution was gradually added to stirring deionized water to obtain an anionic electrodeposited resin composition having a solid content of 8.4%. This electrodeposited resin composition 98
16 parts of an azo-based metal salt red pigment was blended with 4 parts, and the pigment was dispersed with a paint shaker.
IN384 "(manufactured by Ciba, ultraviolet absorber) in an amount of 10 parts to give a red anion electrodeposition bath solution.

Preparation Examples 2 and 3 The same procedures as in Preparation Example 1 were carried out except that the composition of the electrodeposition resin composition and the pigment were changed as shown in Table 1 below. An electrodeposition bath solution was obtained. The blending amounts in Table 1 are expressed in parts by weight.

[0047]

[Table 1]

Production Example 4 of Black Paint Production Example 4 A mixture of 40 parts by weight of methyl methacrylate, 40 parts by weight of butyl acrylate, 20 parts by weight of acrylic acid and 2 parts by weight of azobisisobutyronitrile was heated to 110 ° C. in a nitrogen gas atmosphere. The solution was dropped into 90 parts by weight of propylene glycol monomethyl ether (hydrophilic solvent) held over 3 hours. After the dropwise addition, the mixture was aged for 1 hour, and a mixed solution comprising 1 part by weight of azobisdimethylvaleronitrile and 10 parts by weight of propylene glycol monomethyl ether was added to 1 part.
It was added dropwise over a period of time and aged for 5 hours to obtain a solution with a high acid value acrylic resin (resin acid value: about 155 mgKOH / g). Next, glycidyl methacrylate 24 was added to this solution.
Parts by weight, 0.12 parts by weight of hydroquinone and 0.6 parts by weight of tetraethylammonium bromide, and reacted at 110 ° C. for 5 hours while blowing in air to obtain a photopolymerizable acrylic resin having a solid content of about 54% (resin acid value). About 50m
gKOH / g, polymerizable unsaturated group concentration 1.35 mol / k
g, Tg point 20 ° C., number average molecular weight 20,000).

10 parts of isobutyl acetate, 108 parts of 3-methoxybutyl acetate, and BYK160 (pigment dispersant which is a polymer copolymer, manufactured by BYK Chemie) are added to 130 parts of the obtained acrylic resin solution having a solid content of about 54%. 12 parts and 60 parts of carbon black were blended to perform pigment dispersion to obtain a black pigment paste. To 320 parts of this black pigment paste, 30 parts of trimethylolpropane triacrylate, 2,4-
4 parts of diethylthioxanthone, 2-methyl-2-morpholino (4-thiomethylphenyl) propan-1-one 5
And 780 parts of 3-methoxybutyl acetate, to give a photosensitive black paint.

EXAMPLE On a transparent glass plate (200 × 200 × 1.1 mm),
A substrate having on its surface a transparent electrode patterned in a stripe shape with a line / space of 100/20 μm is immersed in the red electrodeposition paint obtained in Production Example 1 so that every third stripe-shaped transparent electrode can be energized. Electrodeposition coating was performed under the conditions of a voltage of 20 V and an electrodeposition time of 60 seconds, washed with water and baked at 160 ° C. for 30 minutes to form a transparent electrode having a thickness of about 2 μm on the energized striped transparent electrode. A red coating formed.

Next, the substrate on which the red coating film obtained as described above was formed was immersed in the blue electrodeposition paint obtained in Production Example 2 to form a stripe on the right side of the electrode on which the red coating film was formed. The transparent electrode was wired so as to be able to conduct electricity, and was similarly electrodeposited under the conditions of a voltage of 20 V and an electrodeposition time of 60 seconds, washed with water, and baked at 160 ° C. for 30 minutes to form a film on the energized striped transparent electrode. A blue coating of about 2 μm was formed.

Next, the substrate on which the red coating film and the blue coating film obtained as described above were formed was immersed in the blue electrodeposition coating material obtained in Production Example 3 to form a stripe having no coating film. Wiring is performed so that current can flow through the transparent electrode,
Similarly, electrodeposition coating was performed under the conditions of electrodeposition time of 60 seconds, washed with water, and baked at 160 ° C. for 30 minutes to form a green coating film having a thickness of about 2 μm on the energized striped transparent electrode.

The three colors of red, blue and green obtained as described above
On the substrate on which the colored striped colored coating is formed, the laser beam is irradiated by laser ablation in a direction substantially perpendicular to the longitudinal direction of the striped colored coating, and the laser light irradiated part is removed, and coloring is performed. A portion without a coating film was formed in a lattice shape. Laser light irradiation is performed by using a xenon-chlorine gas excimer laser and passing a stencil through a stencil to irradiate a laser of a predetermined pattern under the condition that one pulse having an energy density of 1200 mj / cm ² has four pulses, and line / space = 100 μm / 20 μm
The colored coating film at the irradiated location was decomposed and removed such that

Then, the photosensitive black paint obtained in Production Example 4 was applied on the substrate obtained as described above using a spin coater so as to fill the lattice portion, and preliminarily dried at 80 ° C. for 10 minutes. , A black alcohol coating, polyvinyl alcohol (degree of polymerization 1,700, Tg point 65 ° C, oxygen permeability 2 × 1
A 12% aqueous solution of 0 ^-14 cc · cm / cm ² · sec · cmHg) was uniformly applied by spin coating so that the dry film thickness became about 2 µm, and dried at 80 ° C for 10 minutes.

Then, using a high-pressure mercury lamp from the back side of the substrate obtained as described above (the glass side having no coating film),
The entire surface was exposed under the condition of an exposure amount of 400 mj / cm ² .
Since the red, blue, and green colored coating films contain an ultraviolet absorber, when exposed from the back side of the substrate, red, blue,
The ultraviolet light does not sufficiently reach the black coating on the green colored coating, and the black coating in this portion is not cured, and only the black coating embedded in the lattice portion is cured.

After the above exposure, development is carried out by spraying with a 0.25% aqueous solution of tetramethylammonium hydroxide at 25 ° C. for 30 seconds, washing with water, drying with water, and baking for 60 minutes at 140 ° C. A substrate was obtained in which the glass plate surface was completely covered with a matrix, green, blue and red colored patterns having a thickness of about 2 μm.

The line width of the black (black matrix) colored pattern was 20 μm, and the line width of each of the green, blue and red colored patterns was 100 μm. The resulting multicolored pattern was fine and excellent in long-term performance.

[0058]

According to the method of the present invention, the colored coating film obtained by the pattern electrodeposition method is removed in a pattern by the laser abrasion method so that the portion without the colored coating film becomes a lattice. This is a method in which a black matrix is formed in a portion where there is no colored coating film, and can be applied to a substrate having a large area, and a fine colored pattern having excellent long-term performance can be stably formed with a small number of steps.

[Brief description of the drawings]

FIG. 1 is a model diagram of a cross section of a substrate, showing an example of steps of a method for forming a colored pattern of the present invention.

FIG. 2 is a model diagram of a substrate plane, showing a part of steps of a method for forming a colored pattern according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Transparent substrate 2 ... Striped transparent electrode 3 ... First colored coating 4 ... Second colored coating 5 ... Third colored coating 6 ... Black coating or black matrix

Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location G03F 7/105 B41M 5/26 S (72) Inventor Nakatani ▲ Ei ▼ Saku 4-4-1 Higashi-Hachiman, Hiratsuka-shi, Kanagawa Prefecture 1 Kansai Paint Co., Ltd. (72) Inventor Naozumi Iwasawa Kansai Paint Co., Ltd. 4-1-1, Higashi-Hachiman, Hiratsuka-shi, Kanagawa

Claims (6)

[Claims] 1. A step of (1) forming a colored coating film by electrodepositing a colored electrodeposition paint on a transparent electrode of a substrate having a transparent electrode patterned in a stripe shape on the surface thereof; The laser light is applied in a pattern by laser abrasion in a direction substantially perpendicular to the longitudinal direction of the striped colored coating on the striped colored coating so that the portion without the colored coating becomes a grid. (3) applying a black paint on the surface of the substrate having the colored coating thereon to irradiate at least the grid-like portion without the colored coating; A step of curing the black paint film embedded in the lattice portion and (5) a step of removing the unnecessary black paint film, wherein the colored paint film and the colored paint film on the substrate are provided. Formed in a lattice between the membranes A method for forming a colored pattern comprising a black coating film (black matrix). 2. In the step (1), a plurality of colored electrodeposition paints are used as the colored electrodeposition paint, and a plurality of color coatings are formed on the transparent electrode by electrodeposition coating a plurality of times. The method for forming a colored pattern according to claim 1, wherein: 3. The method according to claim 2, wherein the colors of the plurality of colored electrodeposition paints are three colors of red, blue and green, and form four colored patterns of red, blue, green and black (black matrix). A method for forming a colored pattern as described above. 4. The colored pattern according to claim 1, wherein the black paint is an actinic ray-curable black paint, and in step (4), the black paint film is cured by actinic light. Method. 5. The method according to claim 1, wherein the substrate is a transparent substrate, and in step (4), an actinic ray is irradiated from the back surface of the transparent substrate, and the actinic ray passes through the transparent substrate and is filled with a black paint film. The method for forming a colored pattern according to claim 4, wherein the colored pattern is cured. 6. The method according to claim 3, wherein the transparent substrate for a liquid crystal display device is provided on a transparent substrate.
A color filter comprising four colored patterns formed by the forming method described above.