JP2002189116A - Color filter, method for manufacturing the same and liquid crystal panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method satisfying an aptitude for inkjetting, comprising shortened processes and used for manufacturing an inexpensive color filter with high reliability, especially with high moisture resistance, and to provide a color filter and a liquid crystal panel. SOLUTION: The color filter is manufactured by imparting ink containing a water-soluble anionic dye as a coloring agent and further containing an alkali metal and a volatile amine with 1:9-8:2 molar ratio in it on a transparent substrate by the inkjet method. The liquid crystal panel is constructed by the obtained color filter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color filter used for a color display device, a method of manufacturing the same, and a liquid crystal panel. In particular, color TVs and in-car TVs,
The present invention relates to a color filter suitable for a color liquid crystal display device used for a personal computer, a pachinko game board, and the like, a method for manufacturing the same, and a liquid crystal panel.

[0002]

2. Description of the Related Art In recent years, the development of personal computers,
In particular, with the development of portable personal computers, the demand for liquid crystal displays, especially color liquid crystal displays, tends to increase. However, for further widespread use, it is necessary to reduce the cost of the liquid crystal display. In particular, there is an increasing demand for reducing the cost of a color filter having a high cost. Conventionally, various manufacturing methods have been tried to satisfy the above-mentioned requirements while satisfying the required characteristics of the color filter, but a method that satisfies all the required characteristics has not yet been established. The respective methods will be described below.

[0003] The first method most frequently used is a dyeing method. In the dyeing method, a water-soluble polymer material, which is a material for dyeing, is applied on a glass substrate, and is patterned into a desired shape by a photolithography process. Get a pattern. By repeating this three times, R (red), G
(Green) and B (blue) coloring layers are formed to form color filters.

[0004] Another example of this dyeing method is disclosed in JP-A-5-28.
No. 8913 describes a method of providing a photosensitive layer on a substrate, exposing the photosensitive layer in a pattern, and dyeing an unexposed portion. This process is repeated three times to obtain R, G, B
It is described that a color filter consisting of three colors is manufactured.

[0005] The second method is a pigment dispersion method, which is recently replacing the dyeing method. In this method, a photosensitive resin layer in which a pigment is dispersed is formed on a substrate, and a monochromatic pattern is obtained by patterning the photosensitive resin layer. Further, by repeating this step three times, R, G, and B colored layers are formed to form a color filter.

A third method is an electrodeposition method. In this method, a transparent electrode is patterned on a substrate, and immersed in an electrodeposition coating solution containing a pigment, a resin, an electrolytic solution, and the like to electrodeposit a first color. This process is repeated three times to form R, G, and B colored layers, and finally fired to form a color filter.

As a fourth method, a pigment is dispersed in a thermosetting resin, and printing is repeated three times so that R, G,
After separately applying B, a colored layer is formed by thermally curing the resin to form a color filter. Also,
In any method, a protective film is generally formed on the colored layer.

What is common to these methods is that R,
In order to color the three colors G and B, the same process such as a photolithography process needs to be repeated three times, which increases the cost. In addition, there is a problem that the yield decreases as the number of steps increases. Further, in the electrodeposition method, since the pattern shape that can be formed is limited, it is difficult to apply the current technology for TFT. Further, the printing method is not suitable for forming a fine pitch pattern due to poor resolution.

To compensate for these drawbacks, Japanese Patent Application Laid-Open No.
JP-A-5205, JP-A-63-235901, JP-A-1-217302 and the like describe a method of manufacturing a color filter using an ink jet method. Although the ink jet system has the potential for effective cost reduction, there has not yet been obtained a device whose performance is sufficiently satisfactory. More specifically, the suitability for inkjet, such as the stable ejection property of the colored ink, and the reliability, such as transparency and moisture resistance, of a color filter having a translucent colored portion formed by an inkjet method as a high level. It is often difficult to achieve both.

[0010]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method of manufacturing an inexpensive color filter which can manufacture a highly reliable color filter, which satisfies the suitability for ink-jet and which has a reduced number of steps, a color filter and a liquid crystal panel. It is to provide. In particular, it is an object of the present invention to provide a color filter manufacturing method, a color filter, and a liquid crystal panel which have high moisture resistance and have few restrictions when manufacturing a liquid crystal panel.

[0011]

The object of the present invention is achieved by the following means. (1) A method for producing a color filter, comprising a step of forming a translucent colored portion by applying an ink onto a substrate by an ink jet method, wherein the ink is a water-soluble anionic dye as a colorant in an aqueous medium. , An alkali metal and a volatile amine, wherein the molar ratio of the alkali metal to the volatile amine is in the range of 1: 9 to 8: 2. . (2) A color filter having a transparent colored portion formed on a substrate, wherein the transparent colored portion contains a water-soluble anionic dye, an alkali metal, and a volatile amine in an aqueous medium, and A color filter formed from an ink containing said volatile amine in a molar ratio of 1: 9 to 8: 2. (3) a first substrate having a pixel electrode, a second substrate having a common electrode, a liquid crystal composition layer sealed between the first and second substrates, and coloring corresponding to the pixel electrode A liquid crystal panel having a color filter in which the light-transmitting portions are arranged, wherein the color filter is the color filter of (2).

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention provides a colored ink containing a water-soluble anionic dye as a coloring agent and further containing an alkali metal and a volatile amine in a molar ratio of 1: 9 to 8: 2. Is used to produce a color filter by an ink-jet method. Some or most of the alkali metals and volatile amines in the ink act as counterions for the water-soluble anionic dye.

When all or most of the counter ions of the dye are volatile amines, the volatile amine evaporates during the substrate heating step after the application of the ink, so that the dye becomes water-insoluble. Therefore, the formed color filter has a high moisture resistance, and thus, there is little restriction on the water washing conditions when forming the liquid crystal panel, which is preferable. However, the compatibility with the polymer substance holding the dye on the substrate is reduced, so that the dye is agglomerated in the colored pixel, and the transmittance is reduced, and the depolarization characteristic required for the liquid crystal panel color filter is deteriorated. Problems may occur. In particular, when a color filter is formed by the method of Step 1 described below, a polymer compound for holding the dye on the substrate in the ink is essential, but when the main solvent in the ink is water, the polymer compound is used. Are also highly water-soluble, and in this case, the dye tends to be particularly likely to aggregate. If such agglomeration of the dye occurs, the adhesion between the formed colored layer and the substrate may decrease, which is not preferable.

On the other hand, when the counter ion of the dye in the ink is an alkali metal, the dye does not easily aggregate, but the dye retains hydrophilicity even after the formation of the color filter through a process such as heating and drying. Therefore, the moisture resistance of the color filter may be inferior to the case where the counter ion is a volatile amine.

Accordingly, the dye in the ink used in the present invention has a molar ratio of the alkali metal to the volatile amine in the ink of 1: 9 to 8: 2, preferably 2: 8 to 7: 3. By doing so, the object can be achieved. That is, in the manufacturing method of the present invention, since such a colored ink is used, the suitability for inkjet is satisfied, the process is further shortened, and the color filter can be manufactured at low cost.
And the color filter manufactured by this method is
Aggregation of dyes is suppressed, transparency and depolarization characteristics are excellent, reliability is high, especially, moisture resistance is high, and there are few restrictions when manufacturing a liquid crystal panel.

Hereinafter, the present invention will be described in detail with reference to the drawings.

The method of manufacturing a color filter according to the present invention includes a method of directly applying ink to a concave portion formed in an opening of the black matrix on a substrate provided with the black matrix (step 1 below), The method can be preferably used in both cases where the ink is applied onto the substrate on which the ink receiving layer is formed (Step 2 below). In particular, the former method has a simplified process, and is a more preferable method in consideration of improvement in the yield of color filters, cost reduction, and the like.

FIG. 1 is a process chart showing the manufacturing method of Step 1 in the present invention.

A glass substrate is generally used as the substrate 1. However, a glass substrate is not limited as long as it has necessary characteristics such as transparency (light transmission) and mechanical strength as a liquid crystal color filter. Absent. For example, plastic or the like may be used as the substrate.

First, a black matrix 2 is formed on a substrate 1 as shown in FIG. The black matrix 2 forms a light shielding portion. Thus, a concave portion for applying ink described later is formed in the opening 7 of the black matrix 2.

The black matrix 2 can be formed by known materials and methods. As the black matrix 2, a resin composition containing a black pigment (black pigment resist) is used, and the black pigment resist is formed by a general photolithography method so as to have an opening 7 corresponding to a light transmitting portion having a desired shape. Those formed by patterning the layers in a matrix are preferred.

At this time, the thickness of the light-shielding portion, preferably the thickness of the black pigment resist layer is preferably 0.3 μm or more. When the thickness is 0.3 μm or more, a sufficient optical density is obtained by the black matrix, and the function as a black matrix (light-shielding effect) is sufficiently achieved. Further, when the ink is applied to the opening by the ink jet method, it is possible to sufficiently prevent the ink from overflowing from the opening of the concave portion and flowing into the adjacent opening, so that the inks of different colors are mixed. . The upper limit of the thickness of the light-shielding portion, preferably the black pigment resist layer, is not particularly limited and may be selected from a practical range, but is preferably, for example, about 0.3 to 5.0 μm.

Next, using the ink jet head 5,
The R, G, and B inks are ejected toward the substrate so as to fill the opening 7 of the concave portion, and a pattern of each color is formed (FIG. 1B). At this time, it is preferable that each color ink is applied on the black matrix 2 within a range where the inks do not overlap. The coloring area and the coloring pattern can be set arbitrarily.

As the ink jet system used in the present invention, a bubble jet (registered trademark) type using an electrothermal converter as an energy generating element, a piezo jet type using a piezoelectric element, or the like can be used.

Then, this is formed into a film by an appropriate treatment such as drying to obtain a translucent colored portion. Heat and / or colorant
Alternatively, when a light-curable resin composition is added, at least one of heat treatment and light irradiation is performed, and the colorant is cured and formed into a film, whereby a light-transmissive colored portion can be formed.

Further, a protective layer may be formed thereon if necessary. The protective layer will be described in Step 2.

FIG. 2 is a process chart showing the manufacturing method of Step 2 in the present invention.

As the substrate 1, a glass substrate is generally used as in the case of the step 1. If the substrate 1 has necessary characteristics such as transparency (light transmission) and mechanical strength as a color filter for liquid crystal. Not limited to a glass substrate, for example,
Plastic or the like may be used.

FIG. 2A shows a view in which a black matrix 2 serving as a light shielding portion is formed on a glass substrate 1 having an opening 7 serving as a light transmitting portion. The black matrix 2 is the same as in step 1. Alternatively, a black matrix 2 may be formed by depositing a metal such as chromium on the substrate 1 by sputtering or vapor deposition, and patterning it into a predetermined shape. It is preferable that the thickness of the black matrix 2 of the light shielding portion is 0.3 μm or more.
When the thickness is 0.3 μm or more, a sufficient optical density is obtained by the black matrix, and the function as a black matrix (light-shielding effect) is sufficiently achieved. The upper limit of the thickness is not particularly limited and may be selected from a practical range, but is preferably, for example, about 0.3 to 5.0 μm.

Next, on the substrate 1 on which the black matrix 2 is formed, a resin composition is applied which reduces the wettability and / or the ink absorption of the ink in the light-irradiated portion by light irradiation or light irradiation and heat treatment. Prebake is performed as necessary to form the resin layer 3 (FIG. 2B). This resin layer 3 becomes an ink receiving layer that absorbs ink applied by an inkjet method.

The resin composition is not particularly limited, and examples thereof include an acrylic resin; an epoxy resin;
Silicone resin: cellulose derivatives such as hydroxypropylcellulose, hydroxyethylcellulose, methylcellulose, carboxymethylcellulose and the like, and modified products thereof. Dichromates,
By adding a photoinitiator (crosslinking agent) such as a bis azide compound, a radical initiator, a cationic initiator, or an anionic initiator, the above-described light irradiation or light irradiation and heat treatment are performed to improve the wettability of the ink at the light irradiated portion and / or Alternatively, it is possible to exhibit the property of reducing the ink absorbency.

The thickness of the resin layer (the thickness from the substrate in the portion where the black matrix is not formed) is required to be 0.3 μm when used for a liquid crystal element because transparency is required.
It is preferably at least m or at most 3.0 μm.

For forming the resin layer, a coating method such as spin coating, roll coating, bar coating, spray coating, dip coating and the like can be used, and there is no particular limitation.

Further, compounds such as perylene and anthracene may be added as sensitizers to the composition.

Next, the resin layer in a portion shielded from light by the black matrix 2 is reacted in advance by performing pattern exposure in the form of a stripe using a mask 4 having a stripe-shaped opening to thereby react with the color mixture preventing wall 8 (exposure). (FIG. 2 (c)). At this time, if necessary, light irradiation and heat treatment may be used together to form a color mixing prevention wall.

As the photomask 4 at the time of pattern exposure, a photomask having an opening for exposing the resin layer on the light-shielded portion by the black matrix in a stripe shape is used. At this time, considering that it is necessary to discharge a large amount of ink in order to prevent color omission at the boundary between the black matrix and the opening that is the light transmitting portion, an opening smaller than the light shielding width of the black matrix is required. It is preferable to use a mask having

Prior to the step of applying ink to the resin layer 3 as the ink receiving layer, the black matrix 2 may be cured to reduce the ink absorbency in advance.

Thereafter, in the same manner as in step 1, each color of R, G and B is colored on the resin layer 3 (ink receiving layer) using the ink jet head 5 to form a transparent colored portion of each color (FIG. 2). (D)) Ink drying is performed as necessary.

Next, the colored resin layer is cured by light irradiation and / or heat treatment (FIG. 2 (e)), and a protective layer 6 is formed if necessary (FIG. 2 (f)). However, if the heat resistance of the colored layer is sufficiently high, the step of forming the protective layer 6 can be omitted.

As the protective layer, a resin film of a photo-curing type, a thermo-setting type or a combination of light and heat, an inorganic film formed by vapor deposition, sputtering or the like can be used. And then IT
Any material that can withstand the O electrode forming process, the alignment film forming process, and the like can be used.

In this way, a color filter substrate having an ink receiving layer on the substrate, the ink receiving layer being colored in different colors, and having a plurality of colored portions and non-colored portions is manufactured.

The ink used in the present invention contains at least a water-soluble anionic dye in an aqueous medium, and further contains an alkali metal and a volatile amine. Water can be used as the aqueous medium.

The alkali metal is not particularly limited.
Although a, Li, K and the like can be used, Na is preferable in consideration of the influence on the alignment performance of the liquid crystal after the liquid crystal panel is formed and the total balance of water solubility and the like. One alkali metal may be used alone, or two or more alkali metals may be used in combination.

The volatile amine species is not particularly limited.
Organic amines such as ammonium, monoethanolamine, diethanolamine, and triethanolamine can be used, but ammonium having high volatility is preferable for imparting moisture resistance to the color filter. The volatile amine may be used alone or in combination of two or more.

The molar ratio between the alkali metal and the volatile amine in the ink is 1: 9 to 8: 2, preferably 2: 8 to 7: 3.
Range. If the alkali metal is too large, the moisture resistance may be inferior, and if the volatile amine is too large, the dye may be aggregated, the transmittance may be reduced, or the depolarization characteristics may be deteriorated. .

The colored ink used in the present invention can be prepared, for example, by the following method. 1) An aqueous solution of an anion dye serving as a base is treated with an ion exchange resin to convert counter ions (cations) into hydrogen ions. At this time, inorganic salts such as sodium chloride and sodium sulfate mixed in the dye as impurities are preferably removed by a conventionally known method. 2) A 0.1 to 10% by mass aqueous solution is usually prepared using a dye in which the counter ion is hydrogen ionized, and an aqueous solution of an alkali metal hydroxide, preferably sodium hydroxide, and a volatile amine compound, preferably , A mixed aqueous solution of ammonium hydroxide is added at least in such an amount that the dye is neutralized. The neutralization point can be determined by monitoring while monitoring the pH of the aqueous dye solution.

Here, the mixing ratio of the alkali metal hydroxide, preferably sodium hydroxide, and the volatile amine compound, preferably ammonium hydroxide, is 1: 9 to 8 as a molar ratio of the alkali metal to the volatile amine. : 2, preferably a mixed aqueous solution prepared in the range of 2: 8 to 7: 3. The concentration of the mixed aqueous solution is usually 0.1 to 10.
About 0% by mass is preferable.

The pH of the aqueous dye solution after the addition of a mixed aqueous solution of an alkali metal hydroxide and a volatile amine is as follows:
Usually, 6 to 10 is preferable.

The ink used in the present invention is prepared by the above method, but is not limited to the above method.
For example, the dye solution may be dried once to form a powder, and dissolved in water again when used.

The determination of the alkali metal and the volatile amine in the ink prepared as described above was performed by atomic absorption, ICP (Induction Plasma Emission Spectroscopy), liquid chromatography, ion chromatography, capillary chromatography, gas chromatography. It can be performed by using an analyzer such as a lithography.

The water-soluble anionic dye used in the present invention is not particularly limited. Examples of usable skeleton structures of the dye include phthalocyanine-based, azo-based, and xanthene-based dyes. In the present invention, commercially available acid dyes, direct dyes,
Reactive dyes and the like can be used. The water-soluble anionic dye may be used alone or in combination of two or more.

Specific examples of the water-soluble anionic dye which can be used include phthalocyanine based CI.
ct Blue 86, 87, 168, 199 etc.
rectYellow 132 etc. are CI.
ed 51, 52, 289 etc.

The water-soluble anionic dye has a sulfonic group, a carboxyl group, and the like as an anionic group.
It is preferable to have a sulfonic acid group and / or a carboxylic acid group in consideration of imparting ink jet suitability.
Although the number of anionic groups in one molecule is not particularly limited, it is usually about 1 to 5.

The content of the water-soluble anionic dye in the ink is usually preferably at least 1% by mass, more preferably at most 10% by mass.

The ink may further contain a pigment in addition to the dye described above. The pigment is not particularly limited as long as it can be used as a colorant or ink for an ink jet system and can be used for forming a transparent colored portion of a color filter.

As the aqueous medium, it is preferable to use a water-soluble organic solvent mixed with water from the aspect of dischargeability as an ink jet.

As the organic solvent contained in the ink,
Specifically, methyl alcohol, ethyl alcohol, n
-Propyl alcohol, isopropyl alcohol, n-
Butyl alcohol, sec-butyl alcohol, ter
alkyl alcohols having 1 to 4 carbon atoms such as t-butyl alcohol; amides such as dimethylformamide and dimethylacetamide; ketone or keto alcohols such as acetone and diacetone alcohol; tetrahydrofuran;
Ethers such as dioxane; polyethylene glycol;
Polyalkylene glycos such as polypropylene glycol
Ethylene glycol, propylene glycol, butyl glycol, triethylene glycol, 1, 2, 6
Alkylene glycols having an alkylene group containing 2 to 6 carbon atoms, such as hexanetriol, thiodiglycol, hexylene glycol, diethylene glycol; glycerin; ethylene glycol monomethyl (or ethyl) ether, diethylene glycol methyl (or ethyl) ether; Lower alkyl ethers of polyhydric alcohols such as triethylene glycol monomethyl (or ethyl) ether; N-methyl-2-pyrrolidone, 2-
Pyrrolidone, 1,3-dimethyl-2-imidazolidinone and the like. Among these many organic solvents, polyhydric alcohols such as diethylene glycol and lower alkyl ethers of polyhydric alcohols such as triethylene glycol monomethyl (or ethyl) ether are preferred.

When a color filter is formed in the above step 1, a compound for holding a dye on a substrate is simultaneously contained in the ink. Examples of such a compound are based on the following monomers. Polymeric substances can be used. Specifically, acrylic acid, methacrylic acid, methyl acrylate, acrylates such as ethyl acrylate, methyl methacrylate, methacrylates such as ethyl methacrylate, hydroxymethyl methacrylate,
Hydroxyl-containing vinyl monomers such as hydroxyethyl methacrylate, hydroxymethyl acrylate, and hydroxyethyl acrylate, and other styrene, α-methylstyrene, acrylamide, methacrylamide, acrylonitrile, allylamine, vinylamine, vinyl acetate, vinyl acetate, and the like. Can be
It is not limited to these.

Since the main solvent of the ink used in the present invention is water, the compounds used are preferably water-soluble. In order to impart water solubility to the above compound, means such as adjustment of the amount of acrylic acid charged and introduction of an ethylene oxide group can be used.

The weight average molecular weight of the polymer compound is 5
The range of 00-100,000 is preferable.

The content of the above compound in the ink is 0.5% by mass or more because the dye can be sufficiently retained on the substrate.
The content is particularly preferably 1% by mass or more, and is preferably 15% by mass or less, particularly preferably 10% by mass or less since good ink jet suitability (ejection stability and the like) is obtained.

The polymer compound is a solid (powder) at room temperature. However, even if it is a liquid at room temperature, a compound which is polymerized by heat treatment and / or light irradiation is more preferable from the viewpoint of inkjet suitability.

Specifically, the following are preferred.

[0064]

Embedded image

On the other hand, when the color filter is formed in the step 2, the above-mentioned polymer compound can be used in the same manner, but the polymer compound does not need to have water solubility.

In the ink used in the present invention, in addition to the above-mentioned substances, a water-soluble organic solvent such as a glycol which imparts ink jet suitability such as imparting ejection stability and preventing nozzle clogging, and a pH adjuster (interface Activator), a fungicide, a silane coupling agent and the like.

It is preferable to use deionized water instead of general water containing various ions.

FIG. 3 is a sectional view of a TFT color liquid crystal panel incorporating the color filter of the present invention. The mode is not limited to this example.

In the color liquid crystal panel, the color filter substrate 1 and the counter substrate 14 are generally bonded together with a sealing material (not shown), and the liquid crystal compound 12 is sealed in a gap (about 2 to 5 μm) between these glass substrates. It is formed by this.
TFTs (not shown) and transparent pixel electrodes 13 are formed in a matrix inside one substrate 14 of the liquid crystal panel. The pixel electrode 13 is provided inside the other substrate 1.
The colored portion of the color filter 9 is provided so that the R, G, and B color materials are arranged at positions opposite to the color filter, and a transparent counter electrode (common electrode) 10 is formed on the entire surface. The black matrix 2 is usually formed on the color filter substrate side. Further, an alignment film 11 is formed in the planes of both substrates, and by subjecting the alignment film 11 to rubbing treatment, liquid crystal molecules can be aligned in a certain direction. Further, a polarizing plate 15 is bonded to the outside of each glass substrate. As a backlight, a combination of a fluorescent lamp (not shown) and a scattering plate (not shown) is generally used.
Display is performed by making the liquid crystal compound 12 function as an optical shutter that changes the transmittance of the backlight 16.

In the above embodiment, the black matrix is formed on the color filter substrate. However, by providing the black matrix on the opposing substrate, the aperture ratio can be improved. For example, in a black matrix on array type liquid crystal panel, it is formed on the TFT substrate side facing the color filter substrate.

The liquid crystal compound used in the present invention is not particularly limited, and may be a TN type liquid crystal or a ferroelectric liquid crystal (F
LC) and the like are preferably used.

Further, the present invention is not limited to the active matrix type liquid crystal element shown in the above-described embodiment, but may be, for example, a simple matrix type liquid crystal element.

Further, the color filter of the present invention can be suitably used as a color filter other than a liquid crystal element.

[0074]

The present invention will be described below in detail with reference to examples. Example 1 On a glass substrate, a black pigment resist (trade name: V259-BK739, manufactured by Nippon Steel Chemical Co., Ltd.) was applied by a spin coating method, and a black matrix (thickness: 1 μm, An opening (80 μm × 270 μm) was formed. Next, red ink having the following structure was applied to the opening portion surrounded by the black matrix on the substrate using a bubble jet type ink jet head. Then, the colored portion was cured to form a red translucent colored portion.

Then, a two-pack type thermosetting resin material [Optomer SS6500, manufactured by Nippon Synthetic Rubber Co., Ltd.]
The layer was spin-coated so as to have a thickness of μm and cured by heating at 230 ° C. for 40 minutes to form a protective layer.

Further, a film thickness of 150 nm is formed on the protective layer.
Was formed to form a color filter. <Preparation of red ink> Red dye (D-1) 5 parts by mass Thermosetting compound (H-1) 8 parts by mass Diethylene glycol 30 parts by mass Water 57 parts by mass <Preparation method of the above red dye> Sodium salt 1 of the above red dye By preparing a mass% aqueous solution and passing it through a cylindrical column filled with a sulfonic acid type strongly acidic ion exchange resin, the counter ion of the red dye was exchanged from sodium ion to hydrogen ion (preparation of H type dye). A mixed aqueous solution of sodium hydroxide and ammonium hydroxide (concentration: 5% by mass, molar ratio of sodium ion: ammonium ion = 6: 4) was added to the H-type dye aqueous solution obtained here, and the pH was 8.
It was prepared to be 0. The red dye aqueous solution thus prepared was dried to obtain a red dye powder. [Examples 2 to 4] The dye type, the thermosetting compound type, and the ratio of sodium and ammonium (molar ratio in a mixed aqueous solution of sodium hydroxide and ammonium hydroxide) as counter ions of the dye were changed as shown in Table 1. A color filter was prepared in the same manner as in Example 1 except for the above. The types of thermosetting compounds used in Examples 1 to 5 in Table 1 are represented by Chemical Formula 1 and the types of dyes are represented by Chemical Formula 2 below.

[0077]

Embedded image

(M in the formulas [D1] to [D4] of [Chemical Formula 2] represents a counter ion described in Table 1.) [Example 5] Etching a 0.3 μm-thick chromium vapor-deposited film on a glass substrate As a result, a black matrix (opening 80 μm × 270 μm) was formed. An ink receiving layer (thickness: 1 μm) made of a copolymer of acrylic acid, N-methylolacrylamide, and methyl methacrylate was formed on the substrate. Example 1 was repeated except that the dye type, the thermosetting compound type, and the ratio of sodium to ammonium as a counter ion of the dye (molar ratio in a mixed aqueous solution of sodium hydroxide and ammonium hydroxide) were changed as shown in Table 1. An ink was prepared by the same method as in Example 1. The ink was applied using a bubble jet type ink jet head using this ink, and a color filter was prepared by the same method as in Example 1. Comparative Examples 1 to 3 Color filters were formed in the same manner as in Example 1 except that the counter ions of the dyes of Examples 1 to 3 were changed as shown in Table 1. <Evaluation of Pixel Appearance> The color filter thus produced was visually observed for the appearance of the pixel with an optical microscope.

The pixel appearance was evaluated by ranking the evaluation results into the following four grades. Ranks 4 and 3 were passed, and ranks 2 and 1 were rejected. Table 1 shows the results.

Rank 4: No aggregation of the dye was observed even when observed with a transmission phase contrast microscope, and the pixel was a clear pixel having a very high transmittance.

Rank 3: When observed with a transmission type phase contrast microscope, a spot-like pattern slightly due to aggregation of the dye is observed, but such a phenomenon is not observed at all with an ordinary optical microscope.

Rank 2: A spot-like pattern is clearly observed by observation with a phase-contrast microscope, and the same phenomenon is slightly observed even with an ordinary optical microscope.

Rank 1: In a normal optical microscope observation,
Clear spots are observed. <Evaluation of Moisture Resistance> The color filter prepared as described above was immersed in warm water of 80 ° C. for 30 minutes, and the color difference Δ before and after immersion was measured.
E was measured. The measurement results were evaluated according to the following four ranks. Ranks 4 and 3 were passed, and ranks 2 and 1 were rejected.

Rank 4: Less than ΔE 3 Rank 3: ΔE 3 or more and less than 5 Rank 2: ΔE 5 or more and less than 8 Rank 1: ΔE 8 or more The results are shown in Table 1.

[0085]

[Table 1]

As is evident from Table 1, the color filter of the present invention shows almost no aggregation of the dye and has excellent moisture resistance. The method for producing a color filter of the present invention satisfied the inkjet suitability.

[0087]

According to the present invention, it is possible to manufacture a color filter having high reliability, particularly high moisture resistance, satisfy the inkjet suitability, and provide a method of manufacturing an inexpensive color filter with a reduced number of steps, a color filter and a liquid crystal panel. It is to be.

[Brief description of the drawings]

FIG. 1 is a view showing a step 1 which is an example of a method for manufacturing a color filter of the present invention.

FIG. 2 is a view showing a step 2 which is an example of the method for manufacturing a color filter of the present invention.

FIG. 3 is a schematic sectional view of an example of a liquid crystal panel using the color filter of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate or glass substrate 2 Black matrix 3 Resin layer 4 Mask 5 Ink jet head 6 Protective layer 7 Opening 8 Exposure part 8 'Unexposed part 9 Color filter 10 Common electrode 11 Alignment film 12 Liquid crystal compound 13 Pixel electrode 14 Substrate 15 Polarization plate 16 Backlight 17 Coloring part

Continued on the front page (72) Inventor Akio Kashiwazaki 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (72) Inventor Koichiro Nakazawa 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (72) Inventor Masafumi Hirose 3- 30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. 2C056 EA24 FA03 FB01 2H042 AA09 AA26 2H048 BA11 BA47 BA48 BA64 BB02 BB44 2H091 FA02Y FA35Y FB02 FB12 FB13 FC01 FC22 FC23 LA06 LA12

Claims (28)

[Claims] 1. A method for producing a color filter, comprising a step of forming a translucent colored portion by applying an ink onto a substrate by an inkjet method, wherein the ink is dissolved in an aqueous medium as a water-soluble colorant. It contains an anionic dye, an alkali metal, and a volatile amine, and has a molar ratio of the alkali metal to the volatile amine of 1: 9 to 8: 2.
A method for manufacturing a color filter, wherein 2. The method according to claim 1, wherein the molar ratio of the alkali metal to the volatile amine is in the range of 2: 8 to 7: 3. 3. The method according to claim 1, wherein the alkali metal is sodium. 4. The method according to claim 1, wherein the volatile amine is ammonium. 5. The method according to claim 1, wherein the water-soluble anionic dye has a sulfonic acid group and / or a carboxyl group. 6. The method for producing a color filter according to claim 1, wherein the ink further contains a water-soluble polymer compound or a compound that can be polymerized by heat treatment and / or light irradiation. 7. The color according to claim 6, wherein the content of the water-soluble polymer compound or the compound that can be polymerized by heat treatment and / or light irradiation in the ink is 0.5 to 15% by mass. Manufacturing method of filter. 8. A light-shielding portion and a light-transmitting colored portion are formed on the substrate, and the light-transmitting colored portion comprises: (i) a step of selectively providing a light-shielding portion on the substrate; The method of manufacturing a color filter according to claim 1, wherein the step of supplying the ink to an opening where the light-shielding portion is not provided is performed. 9. The ink further contains a water-soluble polymer compound or a compound that can be polymerized by heat treatment and / or light irradiation, and heats and / or irradiates the ink supplied into the opening. The method for producing a color filter according to claim 8, further comprising a step of forming a cured film by irradiation. 10. The method for manufacturing a color filter according to claim 8, wherein the light shielding portion forms a black matrix. 11. The method for manufacturing a color filter according to claim 8, wherein the light shielding portion includes a black pigment resist. 12. The method for manufacturing a color filter according to claim 8, wherein the thickness of the light shielding portion is 0.5 μm or more. 13. The light-shielding portion and the light-transmitting portion,
The method for producing a color filter according to claim 8, further comprising a step of providing a protective layer of a resin film or an inorganic film. 14. The method according to claim 1, wherein the color filter is a liquid crystal color filter. 15. A color filter having a transparent colored portion formed on a substrate, wherein the transparent colored portion contains a water-soluble anionic dye, an alkali metal, and a volatile amine in an aqueous medium, and 1: 9 to 8: metal and the volatile amine
2. A color filter formed from an ink containing 2 (molar ratio). 16. The color filter according to claim 15, wherein the molar ratio between the alkali metal and the volatile amine is in the range of 2: 8 to 7: 3. 17. The color filter according to claim 15, wherein the alkali metal is sodium. 18. The color filter according to claim 15, wherein said volatile amine is ammonium. 19. The color filter according to claim 15, wherein the water-soluble anionic dye has a sulfonic acid group and / or a carboxyl group. 20. The color filter according to claim 15, wherein the ink further contains a water-soluble polymer compound or a compound that can be polymerized by heat treatment and / or light irradiation. 21. A plurality of said translucent coloring portions, and
21. The color filter according to claim 15, wherein the color filters are arranged. 22. The color filter according to claim 21, wherein a light-shielding portion exists between at least the adjacent transparent coloring portions. 23. The color filter according to claim 22, wherein the light shielding portion forms a black matrix. 24. The color filter according to claim 22, wherein the light shielding portion includes a black pigment-containing resist. 25. The color filter according to claim 22, wherein the thickness of the light shielding portion is 0.5 μm or more. 26. A protective layer of a resin film or an inorganic film on the light-shielding portion and the transparent coloring portion.
25. The color filter according to any one of 25. 27. The color filter according to claim 15, wherein the color filter is a liquid crystal color filter. 28. A first substrate having a pixel electrode, a second substrate having a common electrode, a liquid crystal compound sealed between the first and second substrates, and a transparent material corresponding to the pixel electrode. 28. A liquid crystal panel having a color filter in which light-colored portions are arranged, wherein the color filter is the color filter according to claim 27.