JPH1172614A - Production of color filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To impart satisfactory colorimetric purity and color display contrast, by using a specified phthalocyanine dye as a dye used for forming a colored transparent, part of a color filter. SOLUTION: At least one of many colored transparent parts arranged on a transparent substrate is formed by applying a dye-contg. ink to a prescribed part of the substrate by an ink jetting system. The dye contains at least one phthalocyanine compd. represented by formula I and has <=9 wt.% content of components other than green components. In the formula I, (a) is an integer of 1-3, (b) is an integer of 0-2, (c) is 1 or 2, Pc is metal-free phthalocyanine or metallophthalocyanine, X is -OH, -NH2 , -O-ϕ or -NH-ϕ, Y is represented by formula II and Z is represented by formula III, etc. In the formula III, R<1> is 1-4C alkyl, -CH2 COOM or -C2 H4 OH and R<2> is -CN, -CONH2 or -CH2 SO3 M.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a color filter used in a color liquid crystal display used in a color television, a personal computer, etc., using an ink jet method, a color filter obtained by the method, and The present invention relates to a liquid crystal panel incorporating the color filter.

[0002]

2. Description of the Related Art A color filter is an important component of a color liquid crystal display, and is composed of a pixel formed of a colored translucent portion which is classified into three primary colors of red (R), green (G) and blue (B) on a transparent substrate. Are repeatedly arranged.

In recent years, with the development of personal computers, especially portable personal computers, the demand for liquid crystal displays, especially color liquid crystal displays, has been remarkably increasing.

[0004] In view of this, while cost reduction due to cost reduction of color liquid crystal displays is required, there is an increasing demand for cost reduction of color filters having a high specific gravity in the total cost of color liquid crystal displays.

As a method of reducing the cost of a color filter, for example, a method of employing an ink jet system for forming a colored translucent portion has attracted attention.

[0006]

In the ink jet system, ink droplets are ejected from an ink ejection port and are attached to a portion to be colored to color the portion. There is an advantage that a fine array can be formed with high accuracy and at high speed. As the ink for inkjet, an ink having a predetermined coloring effect and physical properties satisfying ejection characteristics is used. As an ink used in the ink jet system, an ink in which a coloring material such as a dye or a pigment is dissolved or dispersed in an aqueous liquid medium is generally used.

Various green dyes such as phthalocyanine dyes are known as coloring material components of green ink for ink jet.

The use of a phthalocyanine dye is effective for forming a green colored transparent portion of a color filter. However, according to the study of the present inventors, it has been found that the conventional phthalocyanine dye has a practical performance when used as it is. Were satisfactory, but still insufficient to obtain better color saturation and color display contrast.

An object of the present invention is to provide a method of manufacturing a color filter which can obtain better color saturation and color display contrast.
It is to provide a color filter obtained by the manufacturing method and a liquid crystal panel using the color filter.

Another object of the present invention is to provide a liquid crystal panel using a color filter which has good characteristics and can be manufactured at low cost.

[0011]

According to the present invention, there is provided a color filter manufacturing method in which a number of colored light transmitting portions are arranged on a transparent substrate. At least one is formed by applying an ink containing a dye to a predetermined portion of a transparent substrate by an inkjet method, and the dye has the following general formula (1)

[0012]

Embedded image (However, a is an integer of 1 to 3, b is an integer of 0 to 2, c is 1
Or 2, Pc is a metal-free phthalocyanine or metal phthalocyanine, X is -OH, -NH _2, -O-φ or -
NH-φ, Y is

[0013]

Embedded image Z is

[0014]

Embedded image m is 0 or 1, n is 1 or 2, φ is a phenyl group, or a phenyl group substituted with —NO ₂ or —CN,
R ¹ is an alkyl group having 1 to 4 carbon atoms, -CH ₂ COOM or -C ^₂ H ₄ OH, R ₂ is -CN, -CONH ₂ or -C
H ₂ SO ₃ M, R ³

[0015]

Embedded image R ⁴ represents —CH ₃ or —COOM, and M represents an alkali metal, ammonium or organic ammonium, respectively), and the content of components other than the green component is 9% by weight or less. It is characterized by being.

The content of the green component in the phthalocyanine dye of the present invention is, for example, a detection wavelength of 425 nm in a total of all peak areas (X) on a chromatograph at a detection wavelength of 254 nm obtained by liquid chromatography. And the ratio (Y / X) of the sum (Y) of the peak areas of components having absorption peaks at both 670 nm and 670 nm.
The phthalocyanine dye having Y / X of 0.91 or more is used in the present invention.

For example, when the chromatograph schematically shown in FIG. 5 is obtained by analysis at 254 nm, each fraction is classified into the following four cases. Case 1: An absorption peak at both the maximum absorption wavelength of cyan (670 nm) and the maximum absorption wavelength of yellow (425 nm) (FIG. 5). Case 2: An absorption peak only at the maximum absorption wavelength (670 nm) of cyan (FIG. 5). Case 3: An absorption peak only at the maximum absorption wavelength (425 nm) of yellow (FIG. 5). Case 4: Those having no absorption peak at any of the above wavelengths (colorless impurities) (there is no significant peak in the example of FIG. 5).

Next, the ratio of the total area (X) of the fraction having absorption at 425 nm to the total area (Y) of the fraction corresponding to Case 1 (FIG. 5) is determined.

In the present invention, the dye concentration in the ink can be, for example, 0.1 to 15% by weight.
As the ink, an ink containing 5 to 50% by weight of a solvent having a boiling point in the range of 150 to 250 ° C can be used.

Further, the transparent substrate may have an ink receiving layer on a transparent support, and the ink receiving layer may be made of a material containing a polymer containing a water-soluble acrylic monomer unit or a cellulose-based water-soluble polymer. It can be formed using a material that contains

In the color filter manufactured by the above-described method, the color tone of the green colored transparent portion is improved, and the color filter is disposed between the opposed panel substrates, and the liquid crystal composition is sealed. In the liquid crystal panel constituted by the above, more excellent color purity and color display contrast can be obtained.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a dye used as a green ink for ink jet recording for forming a color filter is prepared by adding a yellow component to a phthalocyanine compound (for example, a compound having no side chain as a cyan component). By introducing a unit to be added, for example, an azo component as a side chain, and further introducing a sulfonic acid group to impart or enhance water solubility, the absorption peaks at both wavelengths 425 nm and 670 nm in the absorption spectrum in the visible light region. It can be obtained by mainly removing components other than the green component from a synthesis reaction product obtained by a method of synthesizing the compound of the general formula (1) as a green component.

To remove components other than the green component,
For example, the following methods can be used alone or
A method combining the above can be suitably used. (1) Purification method using organic solvent When the green forming component in the dye and the other components have different solubility in the organic solvent, the dye is stirred in the solvent and separated by filtering. be able to. (2) Method Using Chromatography When there is a difference in the retention time in chromatography between the green forming component and the other components in the dye, these components can be separated by the retention time. (3) Separation method using a separation membrane If there is a difference between the molecular weights of the green-forming component and the other components in the dye, separate them by reverse osmosis or ultrafiltration using a membrane. Can be.

Whether or not components other than the green component are reduced from the synthesis reaction product and the obtained purified dye satisfies the above-mentioned requirements can be confirmed, for example, by the method described in Reference Examples described later.

An example of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic partial cross-sectional view showing an example of the manufacturing process of the color filter of the present invention. In this method, a transparent substrate provided with an ink receiving layer 3 on a transparent support 1 is used as a transparent substrate. As the transparent support 1, a glass plate is generally used, but is not limited to a glass plate as long as it has required properties such as transparency and mechanical strength as a color filter for liquid crystal. A plate made of plastic or the like can be used.

First, a black matrix 2 as a light-shielding portion is formed on the transparent support 1 (see FIG. 1A). As a method of forming this black matrix,
A method generally used in this field, such as a method of forming a metal thin film having a light-shielding effect by sputtering or vapor deposition, or a method of forming a resin thin film having a light-shielding effect by dispersing carbon black and patterning by a photolithography process, is exemplified. .

Next, as shown in FIG. 1B, an ink receiving layer 3 is formed on the transparent support 1 on which the black matrix 2 is formed. The ink receiving layer 3 can form a colored portion by adhering ink to a predetermined portion, and is made of a material capable of forming a layer having good mechanical stability and transparency when the colored portion is formed. Can be made. As the material for forming the ink receiving layer 3, known materials can be used. Examples include polyester, albumin, gelatin, starch, cationized starch, gum arabic, and natural resins such as sodium alginate. In consideration of heat resistance and the like, acrylic resins, epoxy resins, and imide resins are preferable.In addition, in consideration of water-based ink absorbency, cellulose-based water-soluble polymers such as hydroxypropyl cellulose, hydroxyethyl cellulose, methyl cellulose, and carboxymethyl cellulose. Is preferred. From the viewpoint of the fixability of the dye that has adhered and penetrated, it is also preferable to form the ink receiving layer 3 from a material that is cured by heat treatment after application of the ink or irradiation of various energy rays.

Furthermore, in addition to heat resistance and ink absorbency,
In consideration of the transparency of the colored portion, the degree of bleeding, and the light fastness of the dye that has permeated and penetrated, a mixture of hydroxycellulose and methylolated melamine, or the following structural unit (2):

[0029]

Embedded image (However, R ¹ represents H or CH ₃ , R ² represents H or an alkyl group having 1 to 5 carbon atoms). A material containing at least a copolymer with another monomer is more preferable. Other monomers to be copolymerized include carboxyl group-containing vinyl monomers such as acrylic acid and methacrylic acid; and vinyl monomers having a hydroxyl group such as hydroxymethyl methacrylate, hydroxyethyl methacrylate, hydroxymethyl acrylate, and hydroxyethyl acrylate. Monomer;
Amides such as isopropoxymethylacrylamide, acrylamide and methacrylamide; acrylates such as methyl acrylate and ethyl acrylate; methacrylates such as methyl methacrylate and ethyl methacrylate; styrenes such as styrene and α-methylstyrene Compounds; vinyl carboxylic acids such as vinyl acetate and vinyl propionate; acrylonitrile; amines such as allylamine and vinylamine; and the like, but are not limited thereto.

The ink receiving layer 3 may contain various additives as necessary. Specific examples of additives include various surfactants, dye fixatives (waterproofing agents), defoamers, antioxidants, fluorescent brighteners, ultraviolet absorbers, dispersants,
Examples include a viscosity adjuster, a pH adjuster, a fungicide, a plasticizer, and the like. These additives may be arbitrarily selected from conventionally known compounds according to the purpose, and the amount of the additives to be added is within the range not impairing the effects of the present invention, and the desired effect of adding these additives is obtained. It may be within the range specified.

The ink receiving layer 3 is formed, for example, by dissolving or dispersing various materials for formation in a solvent, if necessary, to form a coating liquid, and applying a spin coating method, a roll coating method, a bar coating method, or a play coating method. It can be formed by coating a predetermined area of the transparent support 1 by a method such as dip coating, drying, and, if necessary, pre-baking.

When the ink receiving layer 3 is made of a curable material, the ink receiving layer 3 is subjected to a curing treatment as required. The curing treatment of the ink receiving layer 3 can be suitably performed by, for example, heating. The curing rate in curing at the time of forming the ink receiving layer can be selected according to the material to be used, the desired configuration of the color filter, and the like. For example, after performing a partial curing process for maintaining the form as an ink receiving layer, after performing the application of ink by an inkjet method described below, a method of further performing a curing process, or when providing a protective layer described below In the method, a method in which complete curing (referred to as a desired final cured state) is not performed even in a curing treatment after ink application and curing is completed together with the protective layer after the protective layer is formed can be used.

By curing the ink receiving layer stepwise as described above, better fixing of the ink and good adhesion between the ink receiving layer and the protective layer can be obtained.

For example, the curing treatment of the ink receiving layer before the application of the ink only needs to obtain a sufficient hardness to maintain the form as the ink receiving layer. If no protective layer is provided, complete curing is performed, and if a protective layer is provided, the residual ratio of the uncured portion of the ink receiving layer is 0.5 to 10% in order to prevent delamination or cracks during the formation of the protective layer. Is preferable, and the upper limit thereof is more preferably 5%. The residual rate of the uncured portion of the entire ink receiving layer can be measured by various methods. For example, the absorption of the crosslinked portion formed at the time of curing is measured by an IR analysis method, an NMR analysis method, etc., and finally achieved. It can be calculated by comparing the measured value in the state having the uncured portion with the measured value in the cured state to be obtained.

Next, as shown in FIG. 1C, a predetermined portion of the ink receiving layer 3 is colored with each color ink by an ink jet method. Here, the colored portion of G (green) contains the phthalocyanine compound represented by the general formula (1) described above, and the ratio other than the green forming component is 9%.
Inks containing dyes that are less than or equal to weight percent are used. In addition, known dyes and pigments can be used for inks of other colors, that is, inks for R (red) and B (blue).

The form of the ink is not particularly limited as long as it can be applied to the ink jet system, and various forms such as liquid ink and solid ink can be used.
Among them, water-based inks are preferable in consideration of handleability and the like.

Specific examples of the phthalocyanine compound represented by the general formula (1) include, for example, compounds shown in the following Tables 1 to 7.

[0038]

[Table 1]

[0039]

[Table 2]

[0040]

[Table 3]

[0041]

[Table 4]

[0042]

[Table 5]

[0043]

[Table 6]

[0044]

[Table 7] As the ink jet method, a bubble jet type using an electrothermal converter or a piezo jet type using a piezoelectric element can be used as the energy generating element, and the coloring area and the coloring pattern can be set arbitrarily.

FIG. 2 is a block diagram showing an example of a configuration of an apparatus for drawing a colored portion of a color filter by an ink jet method. In FIG. 2, the CPU 21 is connected to an inkjet head 23 via a head drive circuit 22. Further, the control program information in the program memory 24 is input to the CUP 21. In response to an instruction signal from the CUP 21, the head drive circuit operates to move the ink jet head to a predetermined position on a desired pixel position on the transparent substrate 25, and ejects ink droplets 26 of a desired color to perform coloring. By performing this for all pixel positions on the transparent substrate, a color filter having colored portions arranged can be obtained.

The characteristic particularly required here is the accuracy of the impact point of the ink droplet ejected from the nozzle provided in the ink jet head. If the landing point precision is poor, that is, if the position where the ink droplet lands is shifted from the target position, problems such as a change in color tone due to color mixing with adjacent pixels (or ink droplets), and light transmission parts A problem such as a so-called “white spot” (light leakage from a transparent portion) occurring in a portion not covered with the ink droplets may occur. The following two factors are factors for such deterioration of the landing point accuracy: a) non-uniform wetting of the ink at the end face where the orifice of the head (ejection port at the tip of the nozzle) is opened; and b) the nozzle inside the tip of the nozzle. The phenomenon of thickening of ink can be mentioned.

The first cause a) is that the ink is unevenly wet on the end face of the ink jet head where a number of orifices are opened, so that the ejection direction of ink droplets from the orifice changes irregularly. The present inventors have found that this phenomenon tends to occur more frequently particularly when a dye having a high adsorptivity to the solid surface is used as a colorant for the ink. Generally, dyes used in conventional color filter manufacturing have a molecular design that dyes quickly on the substrate surface.On the other hand, the dye adsorbability on the end face of the orifice described above is also high, so the landing point precision is significantly increased. There were many things that reduced it.

The second cause b) is that the tip of the nozzle is in contact with the atmosphere through the orifice, and the ink at the tip of the nozzle increases in viscosity as the water or the low-boiling solvent evaporates therefrom. , And some of the dyes significantly increase the increase in viscosity. Therefore, when such a dye is used, it is particularly necessary to consider the selection of the ink composition.

On the other hand, the dye containing the phthalocyanine compound of the general formula (1) used in the present invention has an appropriate adsorptivity to the solid surface and has no or little tendency to thicken due to solvent evaporation. According to the ink using the dye, a coloring operation can be performed with good landing point accuracy.

Further, it is required that the ink used has good clarity and light fastness without bleeding of the formed colored portion. When a dye used for conventional ink jet recording on paper or the like is directly used in the production of a color filter, bleeding occurs in the colored portion, or the transparency or light resistance of the colored portion is poor.

In particular, it has been found that the above-mentioned type of dye which has a strong tendency to be adsorbed to the orifice of the ink jet head also tends to cause bleeding in the colored portion. That is, a substance which is easily adsorbed on an organic material or the like has a strong hydrophobicity, and as a result, tends to diffuse (migrate) in the organic material to the receiving layer or the like after coloring. This is not preferable because it appears as bleeding in the colored portion. Therefore, those with less bleeding have good ink jet discharge characteristics.

On the other hand, the dye containing the phthalocyanine compound of the general formula (1) used in the present invention does not cause bleeding in the colored portion, has good transparency and light fastness, and has an ink jet color filter. It is suitable as a colorant component of an ink used in a production method utilizing a method.

As the content of the dye in the ink,
The upper limit is 0.1 to 15% by weight, preferably 10% by weight, more preferably 8% by weight, and the lower limit thereof is preferably 1% by weight, more preferably 2% by weight.

The ink used in the present invention can be prepared by using a solvent or a dispersant necessary according to the form, for example, liquid or solid, and a dye containing the phthalocyanine compound of the general formula (1). it can.

The aqueous liquid medium for dissolving or dispersing the dye in the aqueous ink is preferably a mixture of water and a water-soluble organic solvent. Further, as the aqueous liquid medium, those containing 5 to 50% by weight of a water-soluble organic solvent having a boiling point in the range of 150 ° C to 250 ° C are more preferable, and the upper limit of the boiling point of the water-soluble organic solvent is more preferably 230 ° C. ,
As a lower limit, 180 ° C. is more preferable.

The aqueous liquid medium has a boiling point of 250
The amount of the water-soluble organic solvent having a boiling point exceeding 230 ° C is more preferably 30% by weight or less, and the amount of the water-soluble organic solvent having a boiling point exceeding 230 ° C is more preferably 20% by weight or less.

The water-soluble organic solvents that can be suitably used are shown in Tables 8 to 10 below.

[0058]

[Table 8]

[0059]

[Table 9]

[0060]

[Table 10] The ink may further contain various additives as necessary. Specific examples of the additives include various surfactants, dye fixatives (waterproofing agents), defoamers, antioxidants, fluorescent brighteners, ultraviolet absorbers, dispersants, viscosity adjusters, pH adjusters, Fungicides, plasticizers and the like. These additives may be arbitrarily selected from conventionally known compounds according to the purpose.

After applying each color ink to the ink receiving layer 3 on the transparent support 1 to form a colored translucent portion as described above, if necessary, as shown in FIG. Layer 6
Can be provided.

The protective layer 6 has sufficient strength as a protective layer, has good adhesiveness with the ink receiving layer, and has transparency required for a color filter. Any material can be used as long as it can form a layer that can withstand the subsequent ITO formation process, alignment film formation process, and the like.
As the protective layer 6, for example, a cured layer of an acrylic, epoxy, or silicon resin material, or an inorganic film formed by vapor deposition or sputtering, which is cured by heat treatment and / or light irradiation, can be used.

FIG. 3 is a cross-sectional view showing an example of a TFT color liquid crystal panel incorporating the color filters obtained as described above. This color liquid crystal panel is formed by combining a substrate 14 facing a color filter 9 and sealing a liquid crystal composition 12 therebetween. A TFT (not shown) and a transparent pixel electrode 13 are formed in a matrix inside one substrate of the liquid crystal panel. Further, inside the other substrate 16, a color filter 9 is provided at a position facing the pixel electrode, and a transparent counter (common) electrode 10 is formed on one surface thereof. 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 arranged in a certain direction. Further, a polarizing plate 15 is adhered to the outside of each glass substrate, and the liquid crystal composition is filled in the space (2 to 5 μm) between these glass substrates. Also,
As the backlight 16, a combination of a fluorescent lamp and a scattering plate (both not shown) is used, and display can be performed by making the liquid crystal composition function as an optical shutter for changing the transmittance of the backlight.

[0064]

The present invention will be described in more detail with reference to the following examples. Reference Examples 1 to 8 Copper phthalocyanine was treated with chlorosulfonic acid by a conventional method to synthesize chlorosulfonated copper phthalocyanine. Separately, according to the method described in "Synthetic Chemistry" (Maki Shoten, Kenzo Konishi, Nobuhiko Kuroki), the dye Nos.
1, 5, 7, 10, 15 (see Tables 1, 2, 3, 4, and 5) Intermediates (azo components) for synthesis were synthesized. Next, these compounds were mixed in water and stirred at pH 9 for 10 hours to obtain the desired dyes by a conventional method. Further, the obtained dyes were respectively purified by the following purification methods. Purification method (method using an organic solvent) A 10-fold amount of distilled water was added to the dye, stirred and dissolved, and then concentrated to a 1/2 volume. Thereafter, the same amount of acetone as that of the concentrated dye solution was added thereto, followed by stirring and standing.
The precipitate formed by adding acetone was removed by filtration, and the solvent of the filtrate was evaporated to dryness to obtain the desired purified dye. Purification method (method using chromatography) Using a preparative column (ODS type or the like) manufactured by Yamazen Co., under the following conditions, it corresponds to the above-mentioned case 1 and the other cases 2 to 4. These were separated to obtain the desired purified dye.

Column used: Ultrapack ODS-S-
40D (manufactured by Yamazen) Eluent composition: methanol / water = 5/5 (weight ratio) Purification method (method using separation membrane) The compound (dye main body) corresponding to case 1 described above is compared with the other compounds. Utilizing the fact that the molecular weight is large, separation was carried out using the following separation membrane. That is, an aqueous solution (5% by weight) containing the sample to be separated was prepared and treated with the following separation membrane to obtain the desired purified dye.

Separation membrane name: Aciplex cartridge A
C-132-10 (manufactured by Asahi Kasei Corporation) Separation conditions: Separation was performed by an electrodialyzer using the above separation membrane. Table 11 shows combinations of dyes and purification methods.

[0067]

[Table 11] The obtained purified dyes were subjected to liquid chromatography under the following conditions. Analysis conditions: Liquid chromatography device: HPLC (manufactured by Waters) Packing column: Puresil C18 (manufactured by Waters) Detector: Photodiode array type three-dimensional detector (manufactured by Waters) Solvent for mobile phase: 1 mM TBAB aqueous solution (manufactured by Waters) The concentration gradient of 35% to 60% of acetonitrile is used.) The detection of the eluate captures the data in the entire visible light region (400 nm to 700 nm) without fixing the detection wavelength to one wavelength, and is obtained by the above liquid chromatography. Each peak of the chromatogram detected at the obtained wavelength of 425 nm,
The cases were classified into the following cases. Case 1: an absorption peak at both the maximum absorption wavelength of cyan (670 nm) and the maximum absorption wavelength of yellow (425 nm). Case 2: An absorption peak only at the maximum absorption wavelength of cyan (670 nm). Case 3: An absorption peak only at the maximum absorption wavelength (425 nm) of yellow. Case 4: Those having no absorption peak at any of the above wavelengths (colorless impurities).

Next, the total (X) of the areas of all peaks in the chromatogram detected at a wavelength of 425 nm and the wavelength 4
Case 1 in the chromatogram detected at 25 nm
The total area (Y) of all the peaks of
Was calculated (Y / X). Furthermore, the total area (Z) of the portions corresponding to cases 2 to 4 in the chromatogram detected at a wavelength of 425 nm was determined, and Z / X was determined. Table 12 shows the results.

[0069]

[Table 12] Examples 1 to 5 and Comparative Examples 1 to 3 A resin film in which carbon black was dispersed on a transparent glass support plate by a conventional method was patterned into a desired shape.
A black matrix having an opening (recess) having a size of 0 μm and a width of 60 μm was formed.

Next, N-methylolacrylamide and hydroxyethyl methacrylate (molar ratio,
A curable resin composition comprising a 1: 1) copolymer was spin-coated so as to have a film thickness of 1.2 μm.
Prebaking for 0 minutes was performed. Next, R (red), B (red) and B (common colors) are used for the inks having the common ink compositions shown in Table 11 (the dyes are changed for each color).
(Blue) and G (green) matrix patterns. Each colored portion was formed so as to occupy at least the inside of the opening of the black matrix, and to prevent adjacent colored portions from coming into contact with each other.

[0071]

[Table 13] *) The following dyes are used: For R ink: C.I. I. Acid Red 158 B ink: C.I. I. For Acid Blue 83 G ink: the purified dye prepared in Reference Examples 1 to 8 After the coloring on the ink receiving layer was completed, baking was performed at 230 ° C. for 50 minutes to further advance the curing reaction of the ink receiving layer. Thereafter, a two-component acrylic thermosetting resin material (trade name: SS-7625, manufactured by Nippon Synthetic Rubber Co., Ltd.) is further spin-coated thereon to a thickness of 1 μm,
A liquid crystal color filter was produced by performing a heat treatment at 240 ° C. for 20 minutes and curing. (1) Chromaticity By visual sensory evaluation, the chromaticity rank was relatively evaluated in three ranks of ○, Δ, and × (in order of good chromaticity). (2) Display contrast Based on visual sensory evaluation, rank of display contrast is relatively ○, Δ, × (in order of good display contrast)
Of three ranks.

Table 14 shows the evaluation results.

[0073]

[Table 14]

[0074]

According to the present invention, a good balance between good characteristics as a color filter and technology for cost reduction is further improved, and a color filter having excellent characteristics and a liquid crystal using the color filter are provided. Panels can be manufactured at low cost.

Further, since a phthalocyanine dye containing 9% by weight or less of a component other than a green component is used as a dye for forming a green colored transparent portion of a color filter, a liquid crystal panel equipped with the color filter is used. It is possible to provide better color purity and color display contrast.

[Brief description of the drawings]

FIGS. 1A to 1E are diagrams illustrating an example of a manufacturing process of a color filter.

FIG. 2 is a block diagram illustrating an apparatus for manufacturing a color filter using an inkjet method.

FIG. 3 is a diagram showing the behavior of ink in an ink receiving layer on a transparent substrate.

FIG. 4 is a view showing an example of a structure of a liquid crystal panel in a partial sectional view.

FIG. 5 is a diagram showing an example of a liquid chromatograph.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 transparent support 2 black matrix 3 ink receiving layer 4 inkjet head 5 ink 6 protective layer 9 color filter 10 common electrode 11 alignment film 12 liquid crystal composition 13 pixel electrode 14 glass substrate 15 polarizing plate 16 backlight

Claims (8)

[Claims] 1. A method for manufacturing a color filter in which a number of colored transparent portions are arranged on a transparent substrate, wherein at least one of the colored transparent portions is provided with an ink containing a dye to a predetermined portion of the transparent substrate by an inkjet method. And the dye is represented by the following general formula (1): (Where, a is an integer of 1 to 3, b is an integer of 0 to 2, c is 1 or 2, Pc is a metal-free phthalocyanine or metal phthalocyanine, X is -OH, -NH _2, -O-φ or -NH -Φ, Y is Z is m is 0 or 1, n is 1 or 2, φ is a phenyl group, or a phenyl group substituted with —NO ₂ or —CN, R ¹ is an alkyl group having 1 to 4 carbon atoms, —CH ₂ COOM or —C ₂ H ₄ OH, R ² is —CN, —CONH ₂ or —CH ₂ SO ₃ M, R ³ is R ⁴ represents —CH ₃ or —COOM, and M represents an alkali metal, ammonium or organic ammonium, respectively), and the content of components other than the green component is 9% by weight or less. A method for producing a color filter, characterized in that: 2. The method according to claim 1, wherein the concentration of the dye in the ink is 0.1 to 15.
The method for producing a color filter according to claim 1, wherein the content is% by weight. 3. The ink has a boiling point of 150 to 250 ° C.
The method for producing a color filter according to claim 1, wherein the solvent contains 5 to 50% by weight of a solvent in the range of. 4. The color filter according to claim 1, wherein the transparent substrate has an ink receiving layer on a transparent support, and ink is applied to a predetermined portion of the ink receiving layer to form a colored transparent portion. Production method. 5. The method for manufacturing a color filter according to claim 4, wherein the ink receiving layer is formed using a material containing a polymer containing a water-soluble acrylic monomer unit. 6. The method according to claim 4, wherein the ink receiving layer is formed using a material containing a cellulose-based water-soluble polymer. 7. A color filter manufactured by the method for manufacturing a color filter according to claim 1. 8. A color filter according to claim 4, comprising at least a panel substrate disposed to face the color filter, and a liquid crystal composition sealed between the color filter and the panel substrate. LCD panel.