JP2009051892A - Color filter ink, color filter ink set, color filter, image display device and electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a color filter ink for ink jet method and a color filter ink set, capable of easily forming a colored part with uniform thickness while suppressing color unevenness or density unevenness in each colored part, and thus being stably and suitably used for manufacturing of a color filter excellent in characteristic uniformity between individuals, a color filter excellent in characteristic uniformity between individuals with suppressed color unevenness or density unevenness in each part, and an image display device and electronic equipment provided with the color filter. <P>SOLUTION: The color filter ink to be used for manufacturing of a color filter by an ink jet method comprises a coloring agent, a liquid medium to which the coloring agent is dissolved and/or dispersed, and a resin material, and has a hydroxyl value of 0.16-0.56 KOHm/g. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a color filter ink, a color filter ink set, a color filter, an image display device, and an electronic apparatus.

A color filter is generally used for a liquid crystal display (LCD) or the like that performs color display.
A color filter has conventionally formed a coating film composed of a material (colored layer forming composition) containing a colorant, a photosensitive resin, a functional monomer, a polymerization initiator, etc. on a substrate, and then a photomask. It has been manufactured by using a so-called photolithography method in which a photosensitive process, a developing process, and the like are performed. In such a method, the colors are usually overlapped by repeating the operation of forming a coating film corresponding to each color on almost the entire surface of the substrate, curing only a part thereof, and removing most of the other part. Manufacture color filters so that they do not match. For this reason, only a part of the coating film formed in the production of the color filter remains as a colored layer in the finally obtained color filter, and most of it is removed in the production process. Become. For this reason, not only the manufacturing cost of a color filter rises but it is not preferable also from a viewpoint of resource saving.

  On the other hand, in recent years, a method for forming a colored portion of a color filter using an inkjet head (droplet discharge head) has been proposed (see, for example, Patent Document 1). Such a method is easy to control the discharge position of the droplets of the colored portion forming material (colored layer forming composition) and can reduce waste of the colored portion forming composition. The manufacturing cost can also be suppressed.

  However, in the method of manufacturing a color filter using an inkjet head, there are problems that the vicinity of the edge of the colored portion to be formed and the vicinity of the central portion of the colored portion are raised, and a colored portion having a uniform thickness is formed. could not. As a result, color unevenness, density unevenness, etc. occur in each colored part, and characteristics (especially color characteristics such as contrast ratio, color gamut, etc.) vary among many color filters. The reliability will be low.

JP 2002-372613 A

  An object of the present invention is to produce a color filter that can easily form colored portions having a uniform thickness, suppresses color unevenness and density unevenness in each colored portion, and has excellent property uniformity among individuals. Inkjet color filter ink and color filter ink set that can be used stably and suitably, color unevenness and density unevenness in each part are suppressed, and uniformity of characteristics among individuals And providing an image display device and an electronic apparatus provided with the color filter.

Such an object is achieved by the present invention described below.
The color filter ink of the present invention is a color filter ink used for producing a color filter by an inkjet method,
A colorant, a liquid medium in which the colorant is dissolved and / or dispersed, and a resin material,
The hydroxyl value is 0.16 to 0.56 KOHmg / g.
Thereby, a colored portion having a uniform thickness can be easily formed, color unevenness and density unevenness in each colored portion can be suppressed, and a color filter excellent in property uniformity among individuals can be produced. A possible color filter ink can be provided.

In the color filter ink of the present invention, the hydroxyl value of the resin material contained in the color filter ink is preferably 0.1 to 15.0 KOHmg / g.
As a result, the hydroxyl value of the color filter ink can be easily set to a value in a suitable range, and a colored portion having a uniform thickness can be more easily formed.
In the color filter ink of the present invention, the resin material preferably contains an epoxy resin.
By including an epoxy-based resin, the hydroxyl value of the color filter ink (solid content in the color filter ink) can be easily set to a value within a suitable range, and a colored portion having a uniform thickness can be more easily obtained. Can be formed. Epoxy resins have high transparency and high hardness, and have a small amount of heat shrinkage. For this reason, the adhesiveness of the colored portion to the substrate can be made particularly excellent.

In the color filter ink of the present invention, the content of the resin material in the color filter ink is preferably 0.5 to 10 wt%.
Thereby, the discharge property (discharge stability) from the inkjet head for a color filter can be made particularly excellent, and a colored portion having a more uniform thickness can be formed. In addition, the durability of the manufactured color filter can be made particularly excellent. Further, a sufficient color density can be secured in the manufactured color filter.

In the color filter ink of the present invention, the content of the liquid medium in the color filter ink is preferably 70 to 98 wt%.
Thereby, the fluidity of the color filter ink can be made high, and the ink that has landed on the substrate supporting the colored portion spreads more uniformly on the surface of the substrate, so that the colored portion having a uniform thickness is more reliably formed. be able to. As a result, color unevenness and density unevenness in each colored portion are effectively suppressed, and variation in characteristics among individual color filters can be more effectively prevented. Moreover, the durability of the produced color filter can be made excellent while making the discharge property (discharge stability) from the droplet discharge head for the color filter particularly excellent. Further, a sufficient color density can be secured in the manufactured color filter.

In the color filter ink of the present invention, the liquid medium is 4-methyl-1,3-dioxolan-2-one, 2- (2-methoxy-1-methylethoxy) -1-methylethyl acetate, triethylene. Glycol diacetate, bis (2-butoxyethyl) ether, 1,3-butylene glycol diacetate, diethylene glycol monobutyl ether acetate, triethylene glycol butyl methyl ether, ethyl 3-ethoxypropionate, diethylene glycol diethyl ether, propylene glycol-n- It is preferable to include one or more selected from the group consisting of butyl ether and triethylene glycol dimethyl ether.
Such a compound is particularly excellent in the dispersibility and solubility of the colorant and the resin material, and can make the ink wettability to the substrate or the like supporting the colored portion more appropriate. It can be suitably used as a liquid medium constituting the ink for use.

In the color filter ink of the present invention, the color filter ink is preferably ejected as droplets from a nozzle whose surface is covered with a silica film having a fluoroalkyl group.
As a result, it is possible to more reliably prevent the occurrence of flight bending, droplet volume fluctuations, and nozzle clogging during droplet ejection. Can be made particularly excellent.

The color filter ink set of the present invention is a color filter ink set obtained by combining a plurality of colors of the color filter ink of the present invention,
Among multiple color color filter inks, the difference between the hydroxyl value of the color filter ink having the highest hydroxyl value and the hydroxyl value of the color filter ink having the lowest hydroxyl value is 0.12 KOHmg / g or less. It is characterized by.
Thereby, the dispersion | variation in the thickness between several colored parts can be suppressed effectively, and a highly reliable color filter can be manufactured. In general, when ejection is performed over a long period of time, the ejection characteristics change. However, with such a configuration, in each inkjet head that ejects the color filter ink corresponding to each color, the ejection characteristics change with the same tendency, so the ejection conditions can be easily set. . As a result, the productivity of the color filter can be improved.

The color filter of the present invention is manufactured using the color filter ink of the present invention.
As a result, it is possible to provide a color filter that suppresses color unevenness, density unevenness, and the like at each part and is excellent in uniformity of characteristics among individuals.
An image display device according to the present invention includes the color filter according to the present invention.
Accordingly, it is possible to provide an image display device that suppresses uneven color, uneven density, and the like in each part of the display unit and is excellent in uniformity of characteristics among individuals.
The image display device of the present invention is preferably a liquid crystal panel.
Accordingly, it is possible to provide an image display device that suppresses uneven color, uneven density, and the like in each part of the display unit and is excellent in uniformity of characteristics among individuals.
An electronic apparatus according to the present invention includes the image display device according to the present invention.
As a result, color unevenness, density unevenness, and the like in each part of the display unit are suppressed, and an electronic device having excellent uniformity of characteristics among individuals can be provided.

Hereinafter, preferred embodiments of the present invention will be described in detail.
《Color filter ink》
The color filter ink of the present invention is an ink used for the production of a color filter (formation of a colored portion of a color filter), and is particularly used for the production of a color filter by an ink jet method.
The color filter ink includes a colorant, a liquid medium in which the colorant is dissolved and / or dispersed, a resin material, and the like.

  By the way, in the manufacture of a color filter by an ink jet method that has been used in recent years, waste of a material for forming a colored portion (composition for forming a colored portion) is reduced as compared with a photolithography method that has been widely used before that. Therefore, the burden on the environment can be reduced, and the manufacturing cost can be suppressed. In addition, in the production of a color filter by an ink jet method, there is an advantage that it is easy to control the discharge position and the like of a droplet of a coloring portion forming material (coloring portion forming composition). However, in the method of manufacturing a color filter using an inkjet head, there are problems that the vicinity of the edge of the colored portion to be formed and the vicinity of the central portion of the colored portion are raised, and a colored portion having a uniform thickness is formed. could not. As a result, color unevenness, density unevenness, etc. occur in each colored part, and characteristics (especially color characteristics such as contrast ratio, color gamut, etc.) vary among many color filters. The reliability will be low.

  Therefore, as a result of intensive studies on the main causes of the occurrence of the problems as described above, the present inventors have found that the above problems can be suppressed by setting the hydroxyl value of the color filter ink to a value within a predetermined range. Specifically, by setting the hydroxyl value of the color filter ink to 0.16 to 0.56 KOH mg / g, it is possible to form colored portions having a uniform thickness, and uneven color and uneven density in each colored portion. Is suppressed, and variation in characteristics among individual color filters can be effectively prevented.

  More specifically, by setting the hydroxyl value of the color filter ink within the above range, the affinity with the substrate (work) for supporting the colored portion and the partition wall (hereinafter also referred to as a substrate) that isolates the adjacent colored portion. Therefore, the wettability of the color filter ink with respect to the substrate or the like can be improved. When the wettability is appropriate as described above, the ink landed on the substrate spreads uniformly on the substrate surface, and a colored portion having a uniform thickness can be formed. As a result, color unevenness and density unevenness in each colored portion are suppressed, and variation in characteristics among individual color filters can be effectively prevented.

In addition, by setting the hydroxyl value of the color filter ink within the above range, the adhesion between the formed colored portion and the substrate can be improved.
Also, if the hydroxyl value of the color filter ink is in the above range, the affinity between the color filter ink and the members constituting the ink jet head does not become too high, so that the ink adheres effectively inside the ink jet head. It is suppressed and ink clogging inside the inkjet head can be effectively prevented. Furthermore, since the affinity between the color filter ink and the members constituting the interior of the inkjet head does not become too low, the color filter ink can be appropriately held inside the inkjet head, so that dripping and the like are effectively prevented. Can be prevented. As a result, the color filter ink can be stably ejected from the inkjet head.

  In addition, by setting the hydroxyl value of the color filter ink within the predetermined range as described above, the influence of the manufactured color filter on the voltage holding ratio of the image display device can be reduced. More specifically, the conventional image display device has a problem that the voltage holding ratio is reduced due to an ionic substance eluted from the color filter and luminance unevenness occurs. However, the hydroxyl value of the color filter ink is low. By setting the value within the predetermined range as described above, elution of the ionic substance can be effectively suppressed, and a decrease in the voltage holding ratio of the image display device can be effectively prevented / suppressed. This is because by using the color filter ink as described above, the polarity inside the color filter can be made moderate, and an ionic substance generated unintentionally can be held inside the color filter. It is believed that there is.

  On the other hand, if the hydroxyl value of the color filter ink is less than the lower limit, the affinity with the substrate or the like that supports the colored portion is reduced, so that the wettability of the ink to the substrate or the like that supports the colored portion is reduced. descend. As a result, the colored portion is formed in a state where the vicinity of the central portion is raised, so that the colored portion does not have a uniform thickness. As a result, color unevenness and density unevenness in each colored portion cannot be sufficiently prevented or suppressed. In addition, the adhesion between the formed colored portion and the substrate or the like that supports the colored portion is lowered, and as a result, the durability of the color filter may be lowered. On the other hand, when the hydroxyl value of the color filter ink exceeds the upper limit, the affinity with the substrate or the like that supports the colored portion becomes too high, and the landed color filter ink is in contact with the substrate and the partition as much as possible. Will spread. As a result, the colored portion is formed in a state where the portion in contact with the partition is raised, in other words, in a state where the vicinity of the central portion of the colored portion is recessed, and does not have a uniform thickness. In addition, since the affinity with the members constituting the interior of the inkjet head is increased, the color filter ink is likely to adhere to the interior of the inkjet head. As a result, clogging or the like occurs inside the ink jet head, and it becomes difficult to stably discharge the color filter ink.

In the present invention, the value of the hydroxyl value of the color filter ink may be within the above-mentioned range, but is preferably 0.21 to 0.23 KOHmg / g, preferably 0.21 to 0.22 KOHmg / g. More preferably. Thereby, the effects as described above are more remarkably exhibited.
In the present specification, the hydroxyl value of the color filter ink means the number of mg of potassium hydroxide required to neutralize acetic acid bonded to the hydroxyl group when 1 g of the color filter ink is acetylated. Refers to that.

<Colorant>
A color filter usually has different colored portions (generally, three colors corresponding to RGB). The colorant is usually selected according to the color tone of the colored portion to be formed. As a colorant constituting the color filter ink, for example, various pigments and various dyes can be used.

  Examples of the pigment include C.I. I. Pigment Red 2,3,5,17,22,23,38,81, 48: 1, 48: 2, 48: 3, 48: 4, 49: 1, 52: 1, 53: 1, 57: 1. 63: 1,112,122,144,146,149,166,170,176,177,178,179,185,202,207,209,254,101,102,105,106,108,108: 1, C. I. Pigment green 7,36,15,17,18,19,26,50 (note that even if the metal of phthalocyanine is other than copper, it can be used as a green color material), C.I. I. Pigment blue 1,15,15: 1,15: 2,15: 3, 15: 4, 15: 6, 17: 1, 18, 60, 27, 28, 29, 35, 36, 80, C.I. I. Pigment Yellow 1, 3, 12, 13, 14, 17, 55, 73, 74, 81, 83, 93, 94, 95, 97, 108, 109, 110, 129, 138, 139, 150, 151, 153 154, 168, 184, 185, 34, 35, 35: 1, 37, 37: 1, 42, 43, 53, 157, C.I. I. Pigment violet 1, 3, 19, 23, 50, 14, 16, C.I. I. Pigment orange 5, 13, 16, 36, 43, 20, 20: 1, 104, C.I. I. Pigment Brown 25, 7, 11, 33, various metal derivatives, phthalocyanine compounds, and the like.

  Examples of the dye include azo dyes, anthraquinone dyes, condensed polycyclic aromatic carbonyl dyes, indigoid dyes, carbonium dyes, phthalocyanine dyes, methine, and polymethine dyes. Specific examples of the dye include C.I. I. Direct Red 2, 4, 9, 23, 26, 28, 31, 39, 62, 63, 72, 75, 76, 79, 80, 81, 83, 84, 89, 92, 95, 111, 173, 184 207, 211, 212, 214, 218, 221, 223, 224, 225, 226, 227, 232, 233, 240, 241, 242, 243, 247, C.I. I. Acid Red 35, 42, 51, 52, 57, 62, 80, 82, 111, 114, 118, 119, 127, 128, 131, 143, 145, 151, 154, 157, 158, 211, 249, 254 257, 261, 263, 266, 289, 299, 301, 305, 319, 336, 337, 361, 396, 397, C.I. I. Reactive Red 3, 13, 17, 19, 21, 22, 23, 24, 29, 35, 37, 40, 41, 43, 45, 49, 55, C.I. I. Basic Red 12, 13, 14, 15, 18, 22, 23, 24, 25, 27, 29, 35, 36, 38, 39, 45, 46, C.I. I. Direct violet 7, 9, 47, 48, 51, 66, 90, 93, 94, 95, 98, 100, 101, C.I. I. Acid Violet 5, 9, 11, 34, 43, 47, 48, 51, 75, 90, 103, 126, C.I. I. Reactive violet 1,3,4,5,6,7,8,9,16,17,22,23,24,26,27,33,34, C.I. I. Basic violet 1, 2, 3, 7, 10, 15, 16, 20, 21, 25, 27, 28, 35, 37, 39, 40, 48, C.I. I. Direct yellow 8, 9, 11, 12, 27, 28, 29, 33, 35, 39, 41, 44, 50, 53, 58, 59, 68, 87, 93, 95, 96, 98, 100, 106, 108, 109, 110, 130, 142, 144, 161, 163, C.I. I. Acid Yellow 17, 19, 23, 25, 39, 40, 42, 44, 49, 50, 61, 64, 76, 79, 110, 127, 135, 143, 151, 159, 169, 174, 190, 195 196, 197, 199, 218, 219, 222, 227, C.I. I. Reactive Yellow 2, 3, 13, 14, 15, 17, 18, 23, 24, 25, 26, 27, 29, 35, 37, 41, 42, C.I. I. Basic yellow 1, 2, 4, 11, 13, 14, 15, 19, 21, 23, 24, 25, 28, 29, 32, 36, 39, 40, C.I. I. Acid Green 16, C.I. I. Acid Blue 9, 45, 80, 83, 90, 185, C.I. I. Basic oranges 21, 23, and the like.

In addition, as a colorant, a powder made of the above-described material may be used, for example, after surface treatment such as lyophilic treatment (treatment for improving affinity for a liquid medium described later). Good. Thereby, for example, the dispersibility and dispersion stability of the colorant particles in the color filter ink can be made particularly excellent. Examples of the surface treatment for the colorant include a treatment for modifying the surface of the colorant particle with a polymer. Examples of the polymer that modifies the particle surface of the colorant include polymers described in JP-A-8-259876, commercially available various pigment dispersing polymers or oligomers, and the like.
Moreover, as a coloring agent, you may use combining 2 or more types of components selected from the above, for example.

  In the color filter ink, the colorant may be dissolved or dispersed in the liquid medium described later, but the colorant is dispersed in the liquid medium. If it is, the average particle size of the colorant is preferably 20 to 200 nm, and more preferably 30 to 180 nm. As a result, the color filter manufactured using the color filter ink has sufficiently excellent light resistance, and the dispersion stability of the colorant in the color filter ink and the color development in the color filter are particularly excellent. Can be.

  The content of the colorant in the color filter ink is preferably 2 to 20 wt%, and more preferably 3 to 15 wt%. When the content of the colorant is within the above range, the discharge performance (discharge stability) from the droplet discharge head (inkjet head) for the color filter is particularly excellent, and the color filter manufactured is The durability can be improved. Further, a sufficient color density can be secured in the manufactured color filter.

<Liquid medium>
The liquid medium (liquid medium) has a function of dissolving and / or dispersing the colorant as described above. That is, the liquid medium functions as a solvent and / or a dispersion medium. In general, most of the liquid medium is removed in the process of manufacturing the color filter.

  As the liquid medium constituting the color filter ink, for example, ester compounds, ether compounds, hydroxy ketones, carbonic acid diesters, cyclic amide compounds and the like can be used. Among them, (1) polyhydric alcohols (for example, ethylene glycol) , Propylene glycol, butylene glycol, glycerin, etc.) condensates (polyhydric alcohol ethers), polyhydric alcohols or alkyl ethers of polyhydric alcohol ethers (eg, methyl ether, ethyl ether, butyl ether, hexyl ether, etc.) , Esters (eg, formate, acetate, propionate, etc.), (2) esters of polyvalent carboxylic acids (eg, succinic acid, glutaric acid, etc.) (eg, methyl esters), (3) at least one hydroxyl group in the molecule When Ether compounds having one carboxyl group even without (hydroxy acid), esters and the like, (4) a polyhydric alcohol and a carbonic acid diester having a chemical structure as obtained in the reaction with phosgene is preferred. Examples of the compound that can be used as the liquid medium include 2- (2-methoxy-1-methylethoxy) -1-methylethyl acetate, triethylene glycol dimethyl ether, triethylene glycol diacetate, diethylene glycol monoethyl ether acetate, 4-methyl-1,3-dioxolan-2-one, bis (2-butoxyethyl) ether, dimethyl glutarate, ethylene glycol di-n-butylate, 1,3-butylene glycol diacetate, diethylene glycol monobutyl ether acetate, tetraethylene Glycol dimethyl ether, 1,6-diacetoxyhexane, tripropylene glycol monomethyl ether, butoxypropanol, dipropylene glycol dimethyl ether, diethylene Recall dimethyl ether, ethyl 3-ethoxypropionate, diethylene glycol ethyl methyl ether, 3-methoxybutyl acetate, diethylene glycol diethyl ether, ethyl octoate, ethylene glycol monobutyl ether acetate, ethylene glycol monobutyl ether, cyclohexyl acetate, diethyl succinate, ethylene glycol di Acetate, propylene glycol diacetate, 4-hydroxy-4-methyl-2-pentanone, dimethyl succinate, 1-butoxy-2-propanol, diethylene glycol monoethyl ether, diethylene glycol monomethyl ether, dipropylene glycol monomethyl ether, 3-methoxy- n-butyl acetate, diacetin, dipropylene glycol n Propyl ether, polyethylene glycol monomethyl ether, butyl glycolate, ethylene glycol monohexyl ether, dipropylene glycol n-butyl ether, N-methyl-2-pyrrolidone, triethylene glycol butyl methyl ether, bis (2-propoxyethyl) ether, diethylene glycol Diacetate, diethylene glycol butyl methyl ether, diethylene glycol butyl ethyl ether, diethylene glycol butyl propyl ether, diethylene glycol ethyl propyl ether, diethylene glycol methyl propyl ether, diethylene glycol propyl ether acetate, triethylene glycol methyl ether acetate, triethylene glycol ethyl ether acetate, Triethylene glycol propyl ether acetate, triethylene glycol butyl ether acetate, triethylene glycol butyl ethyl ether, triethylene glycol ethyl methyl ether, triethylene glycol ethyl propyl ether, triethylene glycol methyl propyl ether, dipropylene glycol methyl ether acetate, n- Nonyl alcohol, diethylene glycol monobutyl ether, triethylene glycol monomethyl ether, ethylene glycol 2-ethylhexyl ether, triethylene glycol monoethyl ether, diethylene glycol monohexyl ether, triethylene glycol monobutyl ether, diethylene glycol mono-2-ethylhexyl ether, tripropylene Glycol n- butyl ether, and the like, may be used alone or in combination of two or more selected from these.

  In particular, the liquid medium constituting the color filter ink is 4-methyl-1,3-dioxolan-2-one, 2- (2-methoxy-1-methylethoxy) -1-methylethyl acetate, triethylene glycol. Diacetate, bis (2-butoxyethyl) ether, 1,3-butylene glycol diacetate, diethylene glycol monobutyl ether acetate, triethylene glycol butyl methyl ether, ethyl 3-ethoxypropionate, diethylene glycol diethyl ether, propylene glycol-n-butyl ether It is preferable that one or more selected from the group consisting of triethylene glycol dimethyl ether is included. As a result, it is possible to more effectively suppress color unevenness, density unevenness and the like in each part of the manufactured color filter, and to make the uniformity of characteristics among individuals particularly excellent.

  In particular, when the liquid medium contains 1,3-butylene glycol diacetate, the ink droplet ejection properties can be made particularly excellent over a long period of time. When the liquid medium contains 1,3-butylene glycol diacetate, the proportion of 1,3-butylene glycol diacetate in the liquid medium is preferably 30 to 70 wt%.

Moreover, the solubility with respect to 100 g of water at 25 ° C. of the liquid medium is preferably 0.3 to 9.0 g, and more preferably 0.4 to 8.0 g. As a result, moisture in the air can be effectively prevented from being absorbed into the color filter ink, and deterioration of the resin material and the like constituting the color filter ink can be more effectively prevented. it can. As a result, the change in viscosity with time of the color filter ink can be reduced, and the color filter ink can be stably ejected.
The solubility of the liquid medium in water is such that 25 g of the liquid medium at 25 ° C. is mixed with 100 g of water at 25 ° C., only the aqueous layer is separated, and the weight of the water layer and the weight of water are determined. Obtained by calculating the difference.

  Further, the boiling point of the liquid medium under atmospheric pressure (1 atm) is preferably 180 to 300 ° C, more preferably 190 to 290 ° C, and further preferably 230 to 280 ° C. When the boiling point of the liquid medium under atmospheric pressure is a value within the above range, clogging or the like in the droplet discharge head that discharges the color filter ink can be more effectively prevented, and the productivity of the color filter is improved. Can be made particularly excellent.

  The vapor pressure at 25 ° C. of the liquid medium is preferably 0.1 mmHg or less, and more preferably 0.05 mmHg or less. When the vapor pressure of the liquid medium is within the above range, it is possible to more effectively prevent clogging and the like in the droplet discharge head that discharges the color filter ink, and the color filter productivity is particularly excellent. Can be.

  The content of the liquid medium in the color filter ink is preferably 70 to 98 wt%, and more preferably 80 to 95 wt%. When the content of the liquid medium is within the above range, the discharge property (discharge stability) from the droplet discharge head for the color filter is particularly excellent, and the durability of the manufactured color filter is improved. It can be excellent. In addition, it is possible to more effectively suppress color unevenness, density unevenness, and the like at each portion of the manufactured color filter, and to make the uniformity of characteristics among individuals particularly excellent. Further, a sufficient color density can be secured in the manufactured color filter.

<Dispersant>
The color filter ink may contain a dispersant. Thereby, for example, even when the color filter ink contains a pigment having low dispersibility, the dispersion stability of the pigment can be made excellent, and the storage stability of the color filter ink is excellent. Can be.

  Examples of the dispersant include cationic, anionic, nonionic, amphoteric, silicone, and fluorine surfactants. Specific examples of the surfactant include polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene alkyl ethers such as polyoxyethylene oleyl ether; polyoxyethylene n-octylphenyl ether, polyoxyethylene n-nonyl Polyoxyethylene alkyl phenyl ethers such as phenyl ether; polyethylene glycol diesters such as polyethylene glycol dilaurate and polyethylene glycol distearate; sorbitan fatty acid esters; fatty acid-modified polyesters; tertiary amine-modified polyurethanes; polyethyleneimines In addition, the following trade names are KP (manufactured by Shin-Etsu Chemical Co., Ltd.), Polyflow (manufactured by Kyoeisha Chemical Co., Ltd.), F Top (manufactured by Tochem Products), Mega Pack (Dainippon Ink Chemical Co., Ltd.), Florard (Sumitomo 3M Co., Ltd.), Asahi Guard, Surflon (above, Asahi Glass Co., Ltd.), Disperbyk (Bicchemy Japan Co., Ltd.), Sol Sparse 3000 , 5000, 11200, 12000, 13240, 13650, 13940, 16000, 17000, 18000, 20000, 21000, 22000, 24000SC, 24000GR (manufactured by Nippon Lubrizol Co., Ltd.).

Moreover, as a dispersing agent, the compound which has a simeride ring can be used, for example. By using such a compound as a dispersant, the dispersibility of the pigment in the color filter ink can be made particularly excellent, and the discharge stability of the color filter ink should be made particularly excellent. Can do.
Moreover, as a dispersing agent, the compound which has the partial structure represented by following formula (I) and following formula (II) can be used, for example. By using such a compound as a dispersant, the dispersibility of the colorant (pigment) in the color filter ink can be made particularly excellent, and the discharge stability of the color filter ink is particularly excellent. Can be.

（式中、Ｒ^ａ、Ｒ^ｂ及びＲ^ｃは、各々独立に、水素原子、又は置換されていてもよい環状若しくは鎖状の炭化水素基を表すか、Ｒ^ａ、Ｒ^ｂ及びＲ^ｃのうち２つ以上が互いに結合して環状構造を形成する。Ｒ^ｄは水素原子又はメチル基を表す。Ｘは２価の連結基を表し、Ｙ⁻は対アニオンを表す。）

(Wherein, R ^a , R ^b and R ^c each independently represents a hydrogen atom or an optionally substituted cyclic or chain hydrocarbon group, or R ^a , R ^b and R ^c ) Two or more are bonded to each other to form a cyclic structure, R ^d represents a hydrogen atom or a methyl group, X represents a divalent linking group, and Y ⁻ represents a counter anion.)

（式中、Ｒ^ｅは水素原子又はメチル基を表す。Ｒ^ｆは置換基を有していてもよい環状又は鎖状のアルキル基、置換基を有していてもよいアリール基、又は置換基を有していてもよいアラルキル基を表す。）

(In the formula, R ^e represents a hydrogen atom or a methyl group. R ^f represents a cyclic or chain-like alkyl group which may have a substituent, an aryl group which may have a substituent, or a substituent. Represents an aralkyl group which may have

  The content of the dispersant in the color filter ink is preferably 0.5 to 15 wt%, and more preferably 0.5 to 8 wt%.

<Resin material>
The color filter ink contains a resin material (binder resin). In the color filter, the resin material is a component that mainly contributes to adhesion between the colored portion and the substrate.
The hydroxyl value of the resin material constituting the color filter ink of the present invention is preferably 0.1 to 15.0 KOHmg / g, and more preferably 0.2 to 12.0 KOHmg / g. As a result, the hydroxyl value of the color filter ink can be easily set to a value in a suitable range, and a colored portion having a uniform thickness can be more easily formed. Moreover, the adhesiveness of the coloring part and board | substrate etc. which are formed can be made excellent. On the other hand, if the hydroxyl value of the resin material is less than the lower limit, depending on the content of the resin material, the type of other components, etc., the hydroxyl value of the color filter ink as a whole becomes small, and coloring The thickness of the portion may vary. In addition, sufficient adhesion between the colored portion and the substrate may not be obtained. On the other hand, if the hydroxyl value of the resin material exceeds the upper limit, depending on the content of the resin material or the type of other components, the hydroxyl value of the color filter ink as a whole increases, and the thickness of the colored portion varies. May occur. In addition, it becomes difficult to stably discharge the color filter ink.
When a plurality of types of resin components are used in combination as the resin material, the hydroxyl value of the resin material means the weight average of the hydroxyl values of the plurality of types of resin components.

As the resin material constituting the color filter ink, any resin material such as various thermoplastic resins and various thermosetting resins may be used, but it is preferable to use an epoxy resin. By including an epoxy-based resin, the hydroxyl value of the color filter ink (solid content in the color filter ink) can be easily set to a value within a suitable range, and a colored portion having a uniform thickness can be more easily obtained. Can be formed. Epoxy resins have high transparency and high hardness, and have a small amount of heat shrinkage. For this reason, the adhesiveness of the colored portion to the substrate can be made particularly excellent. As the resin material constituting the color filter ink, it is preferable to use an epoxy resin having a silyl acetate structure (SiOCOCH ₃ ) and an epoxy structure, among epoxy resins. Thereby, it is possible to suitably perform the droplet discharge by the ink jet method, to particularly improve the adhesion between the colored layer and the substrate, and to particularly improve the durability of the color filter. Can do.

When the epoxy resin is included in the resin material, the content of the epoxy resin in the resin material is preferably 1.0 to 55.0 wt%, and is 1.4 to 52.0 wt%. Is more preferable. This makes it possible to more easily form a colored portion having a uniform thickness while making the adhesion of the colored portion to the substrate particularly excellent.
When the epoxy resin is contained in the resin material, the hydroxyl value of the epoxy resin contained in the color filter ink is preferably 0.1 to 15.0 KOHmg / g, and 0.2 to 12. More preferably, it is 0 KOHmg / g. While the adhesion of the colored part to the substrate is particularly excellent, the hydroxyl value of the color filter ink can be made more appropriate, and the colored part having a uniform thickness can be more easily formed. .

  The content of the resin material in the color filter ink is preferably 0.5 to 10 wt%, and more preferably 1 to 5 wt%. When the content of the resin material is a value within the above range, the discharge property (discharge stability) from the inkjet head for the color filter can be made particularly excellent, and the colored portion having a more uniform thickness can be obtained. Can be formed. In addition, the durability of the manufactured color filter can be made particularly excellent. Further, a sufficient color density can be secured in the manufactured color filter. On the other hand, if the content of the resin material is too low, the discharge property (discharge stability) of the color filter ink is reduced, or the hardness of the colored portion to be formed is reduced, resulting in the durability of the produced color filter. descend. On the other hand, if the content of the resin material is too high, it is difficult to ensure a sufficient color density in the manufactured color filter.

<Other ingredients>
The color filter ink may contain various other components as required. Examples of such components (other additives) include various crosslinking agents; various polymerization initiators; dispersion aids such as blue pigment derivatives and yellow pigment derivatives such as copper phthalocyanine derivatives; fillers such as glass and alumina; Polymer compounds such as polyvinyl alcohol, polyethylene glycol monoalkyl ether, polyfluoroalkyl acrylate; vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris (2-methoxyethoxy) silane, N- (2-aminoethyl) -3-amino Propylmethyldimethoxysilane, N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 2- (3,4-epoxy Chlohexyl) adhesion promoter such as ethyltrimethoxysilane, 3-chloropropylmethyldimethoxysilane, 3-chloropropyltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane; 2,2-thiobis Antioxidants such as (4-methyl-6-tert-butylphenol) and 2,6-di-tert-butylphenol; 2- (3-tert-butyl-5-methyl-2-hydroxyphenyl) -5-chlorobenzo UV absorbers such as triazole and alkoxybenzophenone; anti-aggregation agents such as sodium polyacrylate; ink jet ejection performance stabilizers such as methanol, ethanol, i-propanol, n-butanol and glycerin; , EF303, EF35 (Made by Shin-Akita Kasei Co., Ltd.), MegaFuck F171, F172, F173, F178, F178K (Made by Dainippon Ink and Chemicals), Florard FC430, FC431 (Mitsubishi, 3M Co., Ltd.) Asahi Guard AG710, Surflon S-382, SC-101, SC-102, SC-103, SC-104, SC-105, SC-106 (above, manufactured by Asahi Glass Co., Ltd.) ), KP341 (manufactured by Shin-Etsu Chemical Co., Ltd.), Polyflow No. 75, no. 95 (above, manufactured by Kyoeisha Yushi Chemical Co., Ltd.) and the like.
The color filter ink may contain a thermal acid generator or an acid crosslinking agent. The thermal acid generator is a component that generates an acid by heating, and examples thereof include sulfonium salts, onium salts such as benzothiazolium salts, ammonium salts, and phosphonium salts. A benzothiazolium salt is preferred.

  The viscosity at 25 ° C. of the color filter ink is not particularly limited, but is preferably 5 to 12 mPa · s, and more preferably 6 to 10 mPa · s. When the viscosity at 25 ° C. of the color filter ink is within the above range, the discharge property (discharge stability) from the droplet discharge head for the color filter is particularly excellent, and each of the produced color filters Color unevenness, density unevenness, and the like at the site can be more effectively suppressed, and uniformity of characteristics among individuals can be made particularly excellent. Further, clogging or the like in the droplet discharge head that discharges the color filter ink can be more effectively prevented, and the productivity of the color filter can be made particularly excellent. In addition, the measurement of a viscosity can be performed using a vibration type viscometer, for example, and can be especially performed based on JISZ8809. In addition, other measuring methods, for example, a rotational vibration type, a rotary type (E type, B type viscometer), and the Cannon Fenceke method can also be measured. In the present specification, unless otherwise specified, the “viscosity” refers to a value obtained by measurement as described above.

<Ink set>
The color filter ink as described above is used for manufacturing a color filter by an ink jet method. Since the color filter usually corresponds to full color display, it has a plurality of colored portions (usually, three RGB colors corresponding to the three primary colors of light). For forming the colored portions of the plurality of colors, a plurality of types of color filter inks of corresponding colors are used. That is, an ink set including a plurality of color filter inks is used for manufacturing a color filter. In the present invention, in the production of the color filter, the color filter ink as described above may be used as long as it can be used to form at least one colored portion, but can be used to form colored portions of all colors. Is preferred.

  Further, when the color filter ink of the present invention is used for forming colored portions of all colors, the difference between the hydroxyl value of the color filter ink having the highest hydroxyl value and the hydroxyl value of the color filter ink having the lowest hydroxyl value. Is preferably 0.12 KOH mg / g or less, and more preferably 0.1 KOH mg / g or less. Thereby, the dispersion | variation in the thickness between several colored parts can be suppressed effectively, and a highly reliable color filter can be manufactured. In general, when ejection is performed over a long period of time, the ejection characteristics change. However, with the above-described configuration, the ejection characteristics of each inkjet head that ejects the color filter ink corresponding to each color change with the same tendency, so that the ejection conditions can be easily set. it can. As a result, the productivity of the color filter can be improved.

"Color filter"
Next, an example of a color filter manufactured using the color filter ink (ink set) as described above will be described.
FIG. 1 is a cross-sectional view showing a preferred embodiment of the color filter of the present invention.
As shown in FIG. 1, the color filter 1 includes a substrate 11 and a colored portion 12 formed using the color filter ink described above. As the coloring portion 12, a first coloring portion 12A, a second coloring portion 12B, and a third coloring portion 12C having different colors are provided. A partition wall 13 is provided between the adjacent colored portions 12.

<Board>
The substrate 11 is a light-transmitting plate-like member and has a function of supporting the colored portion 12 and the partition wall 13.
The substrate 11 is preferably made of a substantially transparent material. Thereby, a clearer image can be formed by the light transmitted through the color filter 1.

  The substrate 11 is preferably excellent in heat resistance and mechanical strength. Thereby, for example, deformation due to heat applied during the manufacture of the color filter 1 can be reliably prevented. Examples of the constituent material of the substrate 11 that satisfies such conditions include glass, silicon, polycarbonate, polyester, aromatic polyamide, polyamideimide, polyimide, norbornene-based ring-opening polymer, and hydrogenated products thereof.

Among the above, it is preferable to use glass. Thereby, the colored part with a more uniform thickness can be formed effectively. Further, the durability of the entire color filter can be made particularly excellent. Moreover, since glass is excellent in transmittance, the light use efficiency of the color filter can be improved.
Examples of the glass include soda glass, crystalline glass, quartz glass, lead glass, potassium glass, borosilicate glass, and alkali-free glass.

<Coloring part>
The colored portion 12 is formed using the color filter ink as described above.
Since the colored portion 12 is formed using the color filter ink as described above, the variation in characteristics among the pixels is small. For this reason, the color filter 1 has high reliability in which the occurrence of uneven color and uneven density is suppressed.

  By the way, when many hydroxyl groups exist in the colored portion, polarization is caused by the hydroxyl groups. If polarization occurs in this way, when the light that has directionality by passing through the polarizing plate in the liquid crystal display device described later is incident on the colored portion, it is partially scattered by this polarization. As a result, the directionality is lost and polarization leakage occurs. As a result, there is a problem that the contrast of the displayed image is lowered. However, since the colored portion formed with the color filter ink of the present invention has a moderate amount of hydroxyl groups, it can suppress the polarization as described above, and effectively prevent and suppress polarization leakage. can do. As a result, an image with excellent contrast can be displayed.

Each colored portion 12 is provided in a cell 14 which is a region surrounded by a partition wall 13 which will be described later.
The first colored portion 12A, the second colored portion 12B, and the third colored portion 12C have different colors. For example, the first colored portion 12A can be a red filter region (R), the second colored portion 12B can be a green filter region (G), and the third colored portion 12C can be a blue filter region (B). A set of different colored portions 12A, 12B, and 12C constitutes one pixel. In the color filter 1, a predetermined number of colored portions 12 are arranged in the horizontal direction and the vertical direction. For example, when the color filter 1 is a high-definition color filter, 1366 × 768 pixels are arranged, and when the color filter 1 is a full high-definition color filter, 1920 × 1080 pixels are arranged. In the case of a super high vision color filter, 7680 × 4320 pixels are arranged. Note that the color filter 1 may be provided with a spare pixel outside the effective area, for example.

<Partition wall>
A partition wall (bank) 13 is provided between the adjacent colored portions 12. Thereby, it can prevent reliably that the adjacent coloring parts 12 will mix colors, As a result, a clear image can be displayed reliably.
The partition wall 13 may be made of a transparent material, but is preferably made of a light-shielding material. Thereby, an image with excellent contrast can be displayed. The color of the partition wall 13 is not particularly limited, but is preferably black. Thereby, the contrast of the displayed image can be made particularly excellent.

  The height of the partition wall 13 is not particularly limited, but is preferably larger than the thickness of the colored portion 12. Thereby, the color mixture between the adjacent coloring parts 12 can be prevented reliably. The specific thickness of the partition wall 13 is preferably 0.1 to 10 μm, and more preferably 0.5 to 3.5 μm. As a result, color mixing between the adjacent colored portions 12 can be reliably prevented, and the viewing angle characteristics of the image display device and electronic apparatus including the color filter 1 can be improved.

  The partition wall 13 may be made of any material, but for example, is preferably made mainly of a resin material. Thereby, the partition wall 13 can be easily formed as having a desired shape by a method as described later. Moreover, when the partition 13 has a function as a light-shielding part, it may include a light-absorbing material such as carbon black as a constituent material.

《Color filter manufacturing method》
Next, an example of a method for manufacturing the color filter 1 will be described.
2 is a cross-sectional view showing a method for manufacturing a color filter, FIG. 3 is a perspective view showing a droplet discharge device used for manufacturing the color filter, and FIG. 4 is a droplet discharge means in the droplet discharge device shown in FIG. FIG. 5 is a diagram showing the bottom surface of the droplet ejection head in the droplet ejection device shown in FIG. 3, and FIG. 6 is a diagram showing the droplet ejection head in the droplet ejection device shown in FIG. It is a figure, (a) is a section perspective view, (b) is a sectional view.

  As shown in FIG. 2, in this embodiment, a substrate preparation step (1a) for preparing a substrate 11, a partition formation step (1b, 1c) for forming a partition 13 on the substrate 11, and a color filter by an ink jet method. An ink application step (1d) for applying the ink 2 to the region surrounded by the partition wall 13; a colored portion forming step (1e) for removing the liquid medium from the color filter ink 2 to form a solid colored portion 12; have.

<Board preparation process>
First, the substrate 11 is prepared (1a). The substrate 11 prepared in this step is preferably subjected to a cleaning process. In addition, the substrate 11 prepared in this step has been subjected to appropriate pretreatment such as chemical treatment with a silane coupling agent or the like, plasma treatment, ion plating, sputtering, gas phase reaction method, vacuum deposition, and the like. Also good.

<Partition forming process>
Next, the radiation-sensitive composition for forming the partition walls of the substrate 11 is applied to almost the entire one surface of the substrate 11 to form the coating film 3 (1b). In addition, after giving a radiation sensitive composition on the board | substrate 11, you may perform a prebaking process as needed. The pre-bake treatment can be performed, for example, under the conditions of heating temperature: 50 to 150 ° C. and heating time: 30 to 600 seconds.

Then, the partition 13 is formed by performing a post-exposure baking process (PEB) by irradiating with a radiation through a photomask, and further performing a developing process using an alkaline developer (1c). PEB can be performed, for example, under the conditions of heating temperature: 50 to 150 ° C., heating time: 30 to 600 seconds, and radiation irradiation intensity: 1 to 500 mJ / cm ² . The development processing can be performed by, for example, a liquid piling method, a dipping method, a vibration dipping method, or the like, and the development processing time can be set to, for example, 10 to 300 seconds. Further, after the development process, a post-bake process may be performed as necessary. The post-bake treatment can be performed, for example, under the conditions of heating temperature: 150 to 280 ° C. and heating time: 3 to 120 minutes.

<Ink application process>
Next, the color filter ink 2 is applied to the cell 14 surrounded by the partition wall 13 by an inkjet method (1d).
This step is performed using a plurality of types of color filter inks 2 corresponding to the plurality of colored portions 12 to be formed. At this time, since the partition wall 13 is provided, it is reliably prevented that two or more kinds of color filter inks 2 are mixed.
The color filter ink 2 is discharged using a droplet discharge device as shown in FIGS.

  As shown in FIG. 3, the droplet discharge device 100 used in this step is supplied with the color filter ink 2 from the tank 101 that holds the color filter ink 2, the tube 110, and the tube 110. A discharge scanning unit 102. The ejection scanning unit 102 includes a droplet ejection unit 103 in which a plurality of droplet ejection heads (inkjet heads) 114 are mounted on a carriage 105, and a first position control device 104 (movement) that controls the position of the droplet ejection unit 103. Means), a stage 106 for holding the substrate 11 on which the partition wall 13 is formed in the above process (hereinafter also simply referred to as "substrate 11"), and a second position control device 108 (moving means) for controlling the position of the stage 106. ) And a control means 112. The tank 101 and a plurality of droplet discharge heads 114 in the droplet discharge means 103 are connected by a tube 110, and the color filter ink 2 is compressed by compressed air from the tank 101 to each of the plurality of droplet discharge heads 114. Supplied.

The first position control device 104 moves the droplet discharge means 103 along the X-axis direction and the Z-axis direction orthogonal to the X-axis direction in response to a signal from the control means 112. Further, the first position control device 104 also has a function of rotating the droplet discharge means 103 around an axis parallel to the Z axis. In the present embodiment, the Z-axis direction is a direction parallel to the vertical direction (that is, the direction of gravitational acceleration). The second position controller 108 moves the stage 106 along the Y-axis direction orthogonal to both the X-axis direction and the Z-axis direction in response to a signal from the control unit 112. Further, the second position control device 108 also has a function of rotating the stage 106 around an axis parallel to the Z axis.
The stage 106 has a plane parallel to both the X-axis direction and the Y-axis direction. The stage 106 is configured so that the substrate 11 having the cells 14 to which the color filter ink 2 is to be applied can be fixed or held on the plane.

As described above, the droplet discharge means 103 is moved in the X-axis direction by the first position control device 104. On the other hand, the stage 106 is moved in the Y-axis direction by the second position control device 108. That is, the first position control device 104 and the second position control device 108 change the relative position of the droplet discharge head 114 with respect to the stage 106 (the substrate 11 held on the stage 106 and the liquid droplet discharge means 103 are relative to each other). Move on).
The control unit 112 is configured to receive ejection data representing a relative position at which the color filter ink 2 is to be ejected from an external information processing apparatus.

  As shown in FIG. 4, the droplet discharge means 103 has a plurality of droplet discharge heads 114 each having substantially the same structure, and a carriage 105 that holds these droplet discharge heads 114. In the present embodiment, the number of droplet discharge heads 114 held by the droplet discharge means 103 is eight. Each droplet discharge head 114 has a bottom surface provided with a plurality of nozzles 118 described later. The shape of the bottom surface of each droplet discharge head 114 is a polygon having two long sides and two short sides. The bottom surface of the droplet discharge head 114 held by the droplet discharge means 103 faces the stage 106 side, and the long side direction and the short side direction of the droplet discharge head 114 are respectively an X-axis direction and a Y-axis direction. Parallel to the direction.

  As shown in FIG. 5, the droplet discharge head 114 has a plurality of nozzles 118 arranged in the X-axis direction. The plurality of nozzles 118 are arranged such that the nozzle pitch HXP in the X-axis direction in the droplet discharge head 114 has a predetermined value. Although the specific value of nozzle pitch HXP is not specifically limited, For example, it can be set as 50-90 micrometers. Here, the “nozzle pitch HXP in the X-axis direction of the droplet discharge head 114” is a plurality of images obtained by projecting all the nozzles 118 in the droplet discharge head 114 onto the X-axis along the Y-axis direction. This corresponds to the pitch between nozzle images.

In the present embodiment, the plurality of nozzles 118 in the droplet discharge head 114 form a nozzle row 116A and a nozzle row 116B that both extend in the X-axis direction. The nozzle row 116A and the nozzle row 116B are arranged in parallel with a space therebetween. In this embodiment, 90 nozzles 118 are arranged in a line in the X-axis direction at a constant interval LNP in each of the nozzle array 116A and the nozzle array 116B. Although the specific value of LNP is not specifically limited, It can be set as 100-180 micrometers.
The position of the nozzle row 116B is shifted from the position of the nozzle row 116A by a half length of the nozzle pitch LNP in the positive direction in the X-axis direction (right direction in FIG. 5). Therefore, the nozzle pitch HXP in the X-axis direction of the droplet discharge head 114 is half the nozzle pitch LNP of the nozzle row 116A (or nozzle row 116B).

  Accordingly, the nozzle line density in the X-axis direction of the droplet discharge head 114 is twice the nozzle line density of the nozzle row 116A (or nozzle row 116B). In the present specification, “nozzle line density in the X-axis direction” means the number per unit length of a plurality of nozzle images obtained by projecting a plurality of nozzles on the X-axis along the Y-axis direction. It corresponds to. Of course, the number of nozzle rows included in the droplet discharge head 114 is not limited to two. The droplet discharge head 114 may include M nozzle rows. Here, M is a natural number of 1 or more. In this case, in each of the M nozzle rows, the plurality of nozzles 118 are arranged at a pitch that is M times the nozzle pitch HXP. Further, when M is a natural number of 2 or more, the other (M−1) nozzle rows are only i times as long as the nozzle pitch HXP with respect to one of the M nozzle rows. There is no overlap in the X-axis direction. Here, i is a natural number from 1 to (M−1).

  In the present embodiment, each of the nozzle row 116 </ b> A and the nozzle row 116 </ b> B includes 90 nozzles 118, and thus one droplet discharge head 114 has 180 nozzles 118. However, 5 nozzles at both ends of the nozzle row 116A are set as “pause nozzles”. Similarly, 5 nozzles at both ends of the nozzle row 116B are also set as “pause nozzles”. The color filter ink 2 is not ejected from these 20 “rest nozzles”. Therefore, 160 nozzles 118 out of 180 nozzles 118 in the droplet discharge head 114 function as nozzles that discharge the color filter ink 2.

As shown in FIG. 4, in the droplet discharge means 103, a plurality of the droplet discharge heads 114 are arranged in two rows along the X-axis direction. The droplet discharge heads 114 in one row and the droplet discharge heads 114 in the other row are arranged so as to partially overlap when viewed from the Y-axis direction in consideration of the rest nozzles. Thereby, in the droplet discharge means 103, the nozzle 118 that discharges the color filter ink 2 is continuous in the X-axis direction at the nozzle pitch HXP over the length of the dimension of the substrate 11 in the X-axis direction. It is configured.
In the droplet discharge means 103 of the present embodiment, the droplet discharge head 114 is disposed so as to cover the entire length of the substrate 11 in the X-axis direction. A part of the length of the substrate 11 corresponding to the dimension in the X-axis direction may be covered.

  As shown in FIGS. 6A and 6B, each droplet discharge head 114 is an inkjet head. More specifically, each droplet discharge head 114 includes a vibration plate 126 and a nozzle plate 128. Between the diaphragm 126 and the nozzle plate 128, a liquid pool 129 in which the color filter ink 2 supplied from the tank 101 through the hole 131 is always filled is located.

  In addition, a plurality of partition walls 122 are located between the diaphragm 126 and the nozzle plate 128. A portion surrounded by the diaphragm 126, the nozzle plate 128, and the pair of partition walls 122 is a cavity 120. Since the cavities 120 are provided corresponding to the nozzles 118, the number of the cavities 120 and the number of the nozzles 118 are the same. The color filter ink 2 is supplied from the liquid pool 129 to the cavity 120 through the supply port 130 positioned between the pair of partition walls 122.

  Further, the vicinity of the nozzle 118 of the nozzle plate 128 is covered with a silica film having an alkyl fluoride group in the vicinity of the surface. As a result, the nozzle 118 has excellent liquid repellency and can repel the ink 2 particularly preferably. In particular, since the nozzle plate 128 has such a silica film, it is possible to prevent unintentional aggregation of materials such as pigments in the vicinity of the nozzle 118. For this reason, it is possible to reliably prevent the occurrence of flight bends during droplet ejection, fluctuations in the amount of droplets, and clogging of the nozzle 118, and the ejection of droplets of the color filter ink 2 over an extremely long period of time. The property can be made particularly excellent.

  On the diaphragm 126, the vibrator 124 is positioned corresponding to each cavity 120. The vibrator 124 includes a piezoelectric element 124C and a pair of electrodes 124A and 124B that sandwich the piezoelectric element 124C. By applying a driving voltage between the pair of electrodes 124A and 124B, the color filter ink 2 is ejected from the corresponding nozzle 118. The shape of the nozzle 118 is adjusted so that the color filter ink 2 is ejected from the nozzle 118 in the Z-axis direction.

The control means 112 (see FIG. 3) may be configured to give a signal to each of the plurality of vibrators 124 independently of each other. That is, the volume of the color filter ink 2 ejected from the nozzle 118 may be controlled for each nozzle 118 in accordance with a signal from the control unit 112. The control unit 112 can also set the nozzle 118 that performs the ejection operation during the application scan and the nozzle 118 that does not perform the ejection operation.
In this specification, a portion including one nozzle 118, a cavity 120 corresponding to the nozzle 118, and a vibrator 124 corresponding to the cavity 120 may be referred to as “ejection unit 127”. According to this notation, one droplet discharge head 114 has the same number of discharge units 127 as the number of nozzles 118.

Using the droplet discharge device 100 as described above, the color filter ink 2 corresponding to the colored portions 12 of the plurality of colors of the color filter 1 is applied to the cells 14. By using the apparatus as described above, the color filter ink 2 can be efficiently and selectively applied to the cells 14. In the illustrated configuration, the droplet discharge device 100 has only one tank 101 for holding the color filter ink 2, a tube 110, etc., but the color filter 1 has a plurality of these members. It may have a plurality of colors corresponding to the colored portion 12. In manufacturing the color filter 1, a plurality of droplet discharge devices 100 corresponding to a plurality of color filter inks 2 may be used.
In the present invention, the droplet discharge head 114 may use an electrostatic actuator as a driving element instead of a piezoelectric element. In addition, the droplet discharge head 114 may be configured to use an electrothermal conversion element as a drive element and discharge the color filter ink by utilizing the thermal expansion of the material by the electrothermal conversion element.

<Colored part forming step>
Next, the liquid medium is removed from the color filter ink 2 in the cell 14 to obtain a solid colored portion 12 (1e). Thereby, the color filter 1 is obtained. Moreover, in this process, you may make a resin material react with a crosslinking component etc. as needed. The removal of the liquid medium can be performed by heating, for example. At this time, the substrate 11 to which the color filter ink 2 is applied may be placed in a reduced pressure environment. Thereby, removal of a liquid medium can be advanced more efficiently, preventing generation | occurrence | production of the bad influence to the board | substrate 11 grade | etc.,. In this step, irradiation with radiation may be performed. Thereby, reaction with the crosslinking component of a resin material, etc. can be advanced efficiently.

<Image display device>
Next, a preferred embodiment of a liquid crystal display device that is an image display device (electro-optical device) having the color filter 1 will be described.
FIG. 7 is a cross-sectional view showing a preferred embodiment of the liquid crystal display device. As shown in the figure, the liquid crystal display device 60 includes a color filter 1, a substrate (opposite substrate) 66 disposed on the side of the color filter 1 on which the colored portion 12 is provided, a color filter 1 and a substrate 66. And a polarizing plate 67 provided on the surface side opposite to the surface of the substrate 11 of the color filter 1 opposite to the liquid crystal layer 62 (lower side in FIG. 7). And a polarizing plate 68 provided on the surface side opposite to the surface facing the liquid crystal layer 62 of the substrate 66 (upper side in FIG. 7). A common electrode 61 is provided on the surface of the color filter 1 on which the colored portion 12 and the partition wall 13 are provided (the surface opposite to the surface of the colored portion 12 and the partition wall 13 facing the substrate 11). On the surface of the (opposite substrate) 66 facing the liquid crystal layer 62 and the color filter 1, pixel electrodes 65 are arranged in a matrix at positions corresponding to the colored portions 12 of the color filter 1. Further, an alignment film 64 is provided between the common electrode 61 and the liquid crystal layer 62, and an alignment film 63 is provided between the substrate 66 (pixel electrode 65) and the liquid crystal layer 62.

The substrate 66 is a substrate having optical transparency with respect to visible light, and is, for example, a glass substrate.
The common electrode 61 and the pixel electrode 65 are made of a material having optical transparency to visible light, and are made of, for example, ITO.
Although not shown in the drawing, a plurality of switching elements (for example, TFT: thin film transistor) are provided so as to correspond to each pixel electrode 65. For each pixel electrode 65 corresponding to each coloring portion 12, by controlling the voltage application state between the common electrode 61, in the region corresponding to each coloring portion 12 (each pixel electrode 65), Light transmittance can be controlled.

In the liquid crystal display device 60, light emitted from a backlight (not shown) enters from the polarizing plate 68 side (upper side in FIG. 7). And the light which permeate | transmitted the liquid crystal layer 62 and entered into each coloring part 12 (12A, 12B, 12C) of the color filter 1 is polarized as light of the color corresponding to each coloring part 12 (12A, 12B, 12C). The light is emitted from the plate 67 (lower side in FIG. 7).
As described above, since the colored portion 12 is formed using the color filter ink 2 of the present invention, variation in characteristics among pixels is suppressed. As a result, in the liquid crystal display device 60, it is possible to stably display an image in which color unevenness, density unevenness, and the like at each part are suppressed.

"Electronics"
An image display device (electro-optical device) 1000 such as a liquid crystal display device having the color filter 1 as described above can be used for display portions of various electronic devices.
FIG. 8 is a perspective view showing a configuration of a mobile (or notebook) personal computer to which the electronic apparatus of the present invention is applied.
In this figure, a personal computer 1100 includes a main body 1104 having a keyboard 1102 and a display unit 1106. The display unit 1106 is supported by the main body 1104 via a hinge structure so as to be rotatable. Yes.
In the personal computer 1100, the display unit 1106 includes an image display device 1000.
FIG. 9 is a perspective view showing a configuration of a mobile phone (including PHS) to which the electronic apparatus of the present invention is applied.
In this figure, a cellular phone 1200 is provided with an image display device 1000 in a display unit, together with a plurality of operation buttons 1202, an earpiece 1204, and a mouthpiece 1206.

FIG. 10 is a perspective view showing the configuration of a digital still camera to which the electronic apparatus of the present invention is applied. In this figure, connection with an external device is also simply shown.
Here, an ordinary camera sensitizes a silver halide photographic film with a light image of a subject, whereas a digital still camera 1300 photoelectrically converts a light image of a subject with an imaging device such as a CCD (Charge Coupled Device). An imaging signal (image signal) is generated.

On the back of a case (body) 1302 in the digital still camera 1300, an image display device 1000 is provided in the display unit, and is configured to display based on an imaging signal from the CCD, and a finder that displays a subject as an electronic image. Function as.
A circuit board 1308 is installed inside the case. The circuit board 1308 is provided with a memory that can store (store) an imaging signal.
A light receiving unit 1304 including an optical lens (imaging optical system), a CCD, and the like is provided on the front side of the case 1302 (on the back side in the illustrated configuration).

When the photographer confirms the subject image displayed on the display unit and presses the shutter button 1306, the CCD image pickup signal at that time is transferred and stored in the memory of the circuit board 1308.
In the digital still camera 1300, a video signal output terminal 1312 and an input / output terminal 1314 for data communication are provided on the side surface of the case 1302. As shown in the figure, a television monitor 1430 is connected to the video signal output terminal 1312 and a personal computer 1440 is connected to the input / output terminal 1314 for data communication as necessary. Further, the imaging signal stored in the memory of the circuit board 1308 is output to the television monitor 1430 or the personal computer 1440 by a predetermined operation.

  The electronic device of the present invention includes, for example, a television (for example, a liquid crystal television), a video camera, a viewfinder type, a monitor in addition to the above-described personal computer (mobile personal computer), mobile phone, and digital still camera. Direct-view video tape recorder, laptop personal computer, car navigation system, pager, electronic notebook (including communication function), electronic dictionary, calculator, electronic game device, word processor, workstation, videophone, security TV monitor , Electronic binoculars, POS terminals, devices equipped with touch panels (for example, cash dispensers of financial institutions, automatic ticket vending machines), medical devices (for example, electronic thermometers, blood pressure monitors, blood glucose meters, electrocardiographic display devices, ultrasonic diagnostic devices, endoscopy) Mirror display device), fish finder, each Measuring instruments, gauges (e.g., gages for vehicles, aircraft, and ships), a flight simulator, various monitors, and a projection display such as a projector. In particular, televisions have a remarkable tendency to increase the size of display units in recent years. However, in electronic devices having such a large display unit (for example, a display unit having a diagonal length of 80 cm or more), conventional color filter inks are used. When the color filter manufactured using the above is applied, problems such as uneven color and uneven density are particularly likely to occur. However, if the present invention is applied, such problems can be reliably prevented. That is, when applied to an electronic device having a large display unit as described above, the effects of the present invention are more remarkably exhibited.

As mentioned above, although this invention was demonstrated based on suitable embodiment, this invention is not limited to these.
For example, in the above-described embodiment, after applying the color filter ink corresponding to the colored portion of each color in the cell, the liquid medium is removed from the color filter ink of each color in the cell in a batch, That is, although the colored portion forming step has been described as being performed only once, the ink application step and the colored portion forming step may be performed repeatedly corresponding to each color.

Moreover, in the color filter of this invention, the protective film which coat | covers a coloring part may be provided in the surface side opposite to the surface facing the board | substrate of a coloring part. Thereby, damage, deterioration, etc. of a coloring part can be prevented more effectively.
In addition, each unit constituting the color filter, the image display device, and the electronic device can be replaced with an arbitrary one that exhibits the same function, or another configuration can be added.

[1] Preparation of color filter ink (Example 1)
First, a resin (epoxy resin) a was synthesized as follows.
After charging 320 parts by weight of n-hexane, 86 parts by weight of methacrylic acid, and 111 parts by weight of triethylamine in a four-necked flask, a thermometer, a reflux condenser, a stirrer, and nitrogen were added to this four-necked flask. A gas inlet was attached. While cooling this four-necked flask with ice water, 120 parts by weight of trimethylchlorosilane was added dropwise. At this time, the temperature in the reaction system was adjusted to 25 ° C. or lower. Thereafter, the reaction was continued at 25 ° C. for 1 hour. Next, the triethylamine hydrochloride was filtered off, and after removing n-hexane from the obtained filtrate under reduced pressure, the residue was purified by distillation under reduced pressure to obtain an ethylenically unsaturated monomer having a silyl acetate structure. .

  Next, a thermometer, a reflux condenser, a stirrer, and a nitrogen gas inlet were attached, and four charged with 90 parts by weight of 1,3-butylene glycol diacetate and 10 parts by weight of diethylene glycol monobutyl ether acetate as a solvent. A neck flask was prepared. After raising the temperature of 1,3-butylene glycol diacetate and diethylene glycol monobutyl ether acetate in the four-necked flask to 60 ° C. while stirring, the ethylenically unsaturated monomer: 27 parts by weight, and glycidyl methacrylate A mixture of 30 parts by weight, styrene: 38 parts by weight, and 2,2′-azobis- (2,4-dimethylvaleronitrile): 6 parts by weight was added dropwise over 1 hour. After dropping and holding at 60 ° C. for 1 hour, 2,2′-azobis- (2,4-dimethylvaleronitrile): 0.08 part by weight was added, and the mixture was further reacted at 60 ° C. for 6 hours. Was removed by a reduced pressure treatment to obtain a solution of resin a as an epoxy resin having a silyl acetate structure and an epoxy structure. The hydroxyl value of the resin a was 11.5 KOHmg / g.

Next, a resin (acrylic resin) b was synthesized as follows.
First, a thermometer, a reflux condenser, a stirrer, and a nitrogen gas inlet are attached, and four necks charged with 90 parts by weight of 1,3-butylene glycol diacetate and 10 parts by weight of diethylene glycol monobutyl ether acetate as a solvent. A flask was prepared. The temperature in the four-necked flask was increased to 60 ° C. while stirring, and then trimethylolpropane triacrylate: 60 parts by weight, 1,9-nonanediol diacrylate: 30 parts by weight, and 1,6-hexane. A mixture of 10 parts by weight of diol diacrylate and 6 parts by weight of 2,2′-azobis- (2,4-dimethylvaleronitrile) was added dropwise over 1 hour. After dropping and holding at 60 ° C. for 1 hour, 2,2′-azobis- (2,4-dimethylvaleronitrile): 0.08 part by weight was added, and further reacted at 60 ° C. for 1 hour, and then unreacted The monomer b was removed by a reduced pressure treatment to obtain a resin b solution. The alkali number of the resin b was 30 KOHmg / g.
Next, the obtained resin a solution and the resin b solution were mixed so that the ratio of the resin a and the resin b was 9: 1 by weight to prepare a resin solution. The hydroxyl value of the entire resin material contained in the resin liquid was 10.4 KOHmg / g.

  On the other hand, a liquid medium in which 1,3-butylene glycol diacetate and diethylene glycol monobutyl ether acetate are mixed at a weight ratio of 9: 1 is prepared. , Compounds having a simelide ring) and C.I. I. Pigment Red 254 and C.I. I. Pigment Yellow 150 was added. Thereafter, the mixture was introduced into a bead mill (zirconia beads: 0.65 mm used), and the pigment was pulverized to obtain a pigment dispersion.

Thereafter, a red color filter ink (R ink) was prepared by mixing the resin liquid and the pigment dispersion. C. in R ink I. The average particle size of Pigment Red 254 was 80 nm.
In addition, C.I. I. In place of Pigment Red 254, C.I. I. Pigment green 36, C.I. I. Pigment Blue 15: 6 was used, and the green color filter ink (in the same manner as the red color filter ink) except that the amount of the ink constituent material such as a colorant and a liquid medium was changed. G ink) and blue color filter ink (B ink) were prepared. As a result, an ink set composed of three colors of R, G, and B was obtained. C. in G ink. I. Pigment Green 36 average particle diameter, C.I. I. The average particle size of CI Pigment Blue 15: 6 was 70 nm.
In addition, each component in the inks of the respective colors was blended as shown in the table.

(Examples 2 to 8)
A color filter ink (ink set) was prepared in the same manner as in Example 1 except that the blending ratio of the resin a and the resin b was shown in the table.
(Comparative Examples 1 and 2)
A color filter ink (ink set) was prepared in the same manner as in Example 1 except that the blending ratio of the resin a and the resin b was shown in the table.

  For each of the examples and comparative examples, the composition, hydroxyl value, etc. of the color filter ink are shown in Tables 1 and 2 together with the characteristics of the liquid medium. In the table, C.I. I. Pigment Red 254 is "PR254", C.I. I. Pigment Green 36 is “PG36”, C.I. I. Pigment Blue 15: 6 is changed to “PB15: 6”, C.I. I. Pigment Yellow 150 is indicated by “PY150”, and the resins a and b are indicated by “a” and “b”, respectively. In the table, 1,3-butylene glycol diacetate was indicated as 1,3-BGDA and diethylene glycol monobutyl ether acetate as BCA. In the table, the “ink viscosity” column shows the viscosity of the color filter ink at 25 ° C. measured according to JIS Z8809 using a vibration viscometer, and the “boiling point” column shows the viscosity. Indicates the boiling point of the liquid medium at normal pressure (1 atm), and the “vapor pressure” column indicates the vapor pressure at 25 ° C. of the liquid medium. In addition, the solubility of the color filter ink and the liquid medium in water is such that 25 g of water: 100 g is mixed with 25 g of water: 100 g, and only the water layer is separated. Obtained by determining the difference from the weight.

[2] Droplet ejection stability evaluation (stable ejection performance evaluation)
[2.1] Continuous Discharge Test Using a droplet discharge apparatus as shown in FIGS. 3 to 6 and the color filter ink set of each of the examples and comparative examples, in an environment of 23 ° C. and 50% RH. Then, each ink constituting the color filter ink set was discharged by continuously operating the droplet discharge device for 24 hours. At this time, for each color ink, the discharge weight per nozzle is determined every hour, the droplets: the discharge amount per droplet is determined, and the average of each color is determined for the droplets discharged in the first hour Ink droplets: average weight per drop W ₁ [ng], and for droplets ejected in 24 hours, average ink droplets of each color: average weight per drop W ₂₄ [ng] I asked for each. Next, a ratio (W ₂₄ / W ₁ ) between W _{1 at the} first hour and W _{24 at the} twenty-fourth hour is obtained, and in accordance with the following three-stage criteria, variations in droplet ejection during continuous ejection are determined. Evaluation was performed. It can be said that the closer the value of W ₂₄ / W ₁ is to 1, the smaller the variation in droplet discharge amount during continuous discharge.
A: 0.975 ≦ W ₂₄ / W ₁ ≦ 1.025.
B: 0.95 ≦ W ₂₄ / W ₁ ≦ 1.05. (However, 0.975 ≦ W ₂₄ / W ₁ ≦ 1.025 is excluded.)
C: 0.95> W ₂₄ / W ₁ or W ₂₄ / W ₁ <1.05.

[2.2] Evaluation of landing position accuracy A droplet discharge device as shown in FIGS. 3 to 6 and ink sets for color filters of the above-described examples and comparative examples were prepared, and the drive waveform of the piezoelectric element was optimized. In this state, 10000 droplets (10000 droplets) were continuously discharged from each nozzle of the droplet discharge head for each ink in an environment of 23 ° C. and 50% RH. For the 10,000 droplets ejected from the designated nozzle near the center of the droplet ejection head, the average value of the deviation amount d from the center aiming position of the center position of each landed droplet is obtained, and the following three steps Evaluation was performed according to the criteria of As the average value of the shift amount d, the average value of the values obtained for the three color inks was employed.
A: The average value of the shift amount d is less than 0.05 μm.
B: The average value of the shift amounts d is 0.05 μm or more and less than 0.10 μm.
C: The average value of the shift amounts d is 0.10 μm or more.

[2.3] Stability Evaluation of Droplet Discharge Amount A droplet discharge device as shown in FIGS. 3 to 6 and the color filter ink sets of the respective examples and comparative examples are prepared, and the drive waveform of the piezo element is prepared. In an optimized state, 10000 droplets (10000 droplets) were continuously ejected from each nozzle of the droplet ejection head for each ink in an environment of 23 ° C. and 50% RH. For the two specified nozzles on the left and right ends of the droplet discharge head, the total weight of the discharged droplets is obtained, and the absolute value ΔW [ng] of the difference between the average discharge amounts of the droplets discharged from the two nozzles is calculated. Asked. The ratio (ΔW / W _T ) of ΔW to the target droplet discharge amount W _T [ng] was determined and evaluated according to the following three-stage criteria. As the value of [Delta] W / W _T is small, it can be said that the greater the stability of the droplet discharge amount. As the value of [Delta] W / W _T, it was used the average of the values obtained for the three colors of ink.
A: The value of ΔW / _{W T} is less than 0.025.
B: The value of ΔW / _{W T} is less than 0.025 or more 0.625.
C: The value of ΔW / _{W T} is 0.625 or more.

[2.4] Evaluation of intermittent printing performance A droplet discharge device as shown in FIGS. 3 to 6 and the color filter ink set of each of the examples and comparative examples were prepared, and the drive waveform of the piezoelectric element was optimized. In this state, for each ink, 1000 droplets (1000 droplets) were continuously ejected from each nozzle of the droplet ejection head in an environment of 23 ° C. and 50% RH. Discharge was interrupted (first sequence). Thereafter, similarly, the operation of continuously discharging the droplets and interrupting the discharge of the droplets were repeated. For the specified nozzle near the center of the droplet discharge head, the average weight W ₁ [ng] of the droplets discharged in the first sequence and the average weight W ₁₀ [ng] of the droplets discharged in the tenth sequence And asked. Then, the ratio (| W ₁ −W ₁₀ | / W _T ) of the absolute value of the difference between W ₁ and W ₁₀ with respect to the target discharge amount W _T [ng] of the droplet is obtained, and the following three criteria are used. ,evaluated. | _W 1 _-W 10 | as the value of / _{W T} is small, it can be said to be excellent in intermittent printing performance (stability of the droplet discharge quantity). As the value of | W ₁ −W ₁₀ | / W, an average value of the values obtained for the three colors of ink was adopted.
_A: | _{W 1} -W 10 | values of / _{W T} is less than 0.025.
_B: | _{W 1} -W 10 | values of / _{W T} is less than 0.025 or more 0.625.
_C: | _{W 1} -W 10 | value of / _{W T} is 0.625 or more.
In addition, said evaluation was performed on the same conditions about each Example and each comparative example.

[3] Production of color filter A color filter was produced in the following manner using the color filter ink (ink set) prepared in each of the above Examples and Comparative Examples.
First, a soda glass substrate (G5 size: 1100 × 1300 mm) on which a silica (SiO ₂ ) film for preventing elution of sodium ions was formed on both surfaces was prepared and subjected to a cleaning treatment.
Next, the radiation-sensitive composition for forming partition walls containing carbon black was applied to the entire surface of one of the cleaned substrates to form a coating film.
Next, prebaking was performed under the conditions of heating temperature: 110 ° C. and heating time: 120 seconds.

Thereafter, irradiation with radiation is performed through a photomask to perform post-exposure baking (PEB), followed by development using an alkaline developer, and further by performing post-baking, thereby separating the partition walls. Formed. PEB was performed under the conditions of heating temperature: 110 ° C., heating time: 120 seconds, and radiation irradiation intensity: 150 mJ / cm ² . The development process was performed by, for example, a vibration dipping method. The development processing time was 60 seconds. The post-bake treatment was performed under the conditions of heating temperature: 150 ° C. and heating time: 5 minutes. The formed partition wall had a thickness of 2.1 μm.

Next, using a droplet discharge device as shown in FIGS. 3 to 6, the color filter ink was discharged into a cell as a region surrounded by the partition in an environment of 23 ° C. and 50% RH. . At this time, three color filter inks were used so that the color filter inks of the respective colors were not mixed.
Thereafter, heat treatment was performed on a hot plate at 100 ° C. for 10 minutes, and further, heat treatment was performed in an oven at 200 ° C. for 1 hour, whereby three colored portions were formed. Thereby, a color filter as shown in FIG. 1 was obtained.
Using the method as described above, 1000 color filters were manufactured using the color filter inks (ink sets) of each Example and each Comparative Example.

[4] Evaluation The following evaluation was performed using each color filter obtained as described above.
[4.1] Color unevenness, density unevenness, light leakage (polarization leakage)
Among the color filters manufactured using the color filter inks (ink sets) of the respective Examples and Comparative Examples, each color filter manufactured on the 1000th sheet is shown in FIG. 7 under the same conditions. Such a liquid crystal display device was manufactured.

Using these liquid crystal display devices, visual observation is performed in a dark room with red single color display, green single color display, blue single color display, and white single color display, and color unevenness and density at each part. Unevenly, the occurrence of light leakage was evaluated according to the following five-stage criteria.
A: Color unevenness, density unevenness, and light leakage are not recognized at all.
B: Color unevenness, density unevenness, and light leakage are hardly observed.
C: Color unevenness, density unevenness, and light leakage are slightly observed.
D: Color unevenness, density unevenness, and light leakage are clearly recognized.
E: Color unevenness, density unevenness, and light leakage are remarkably recognized.
In the above evaluation, each liquid crystal display device was manufactured under the same conditions, displayed under the same conditions, and observed and measured under the same conditions.

[4.2] Characteristic difference among individuals The color filters manufactured using the color filter inks (ink sets) of the respective Examples and Comparative Examples were manufactured for 990 to 999 sheets, respectively. A color filter was prepared, and red single color display, green single color display, blue single color display, and white single color display were performed in a dark room, and color measurement was performed using a spectrophotometer (MCPD3000, manufactured by Otsuka Electronics Co., Ltd.). From the results, for each example and each comparative example, the maximum color difference (color difference ΔE in the Lab display system) is obtained with the color filter manufactured in the 990th to 999th sheets, and the following five criteria are used. ,evaluated.

A: Color difference (ΔE) is less than 2.
B: Color difference (ΔE) is 2 or more and less than 3.
C: Color difference (ΔE) is 3 or more and less than 4.
D: Color difference (ΔE) is 4 or more and less than 5.
E: Color difference (ΔE) is 5 or more.
In the above evaluation, each color filter was observed and measured under the same conditions.

[4.3] Voltage holding ratio of liquid crystal layer An image display device as shown in FIG. 7 is formed using a color filter manufactured using the color filter ink (ink set) of each of the above examples and comparative examples. Manufactured.
A voltage holding ratio (VHR) of 16.7 milliseconds after release of the application after applying a voltage of 5 V to the manufactured image display device (liquid crystal layer) with an application time of 60 microseconds and a span of 16.7 milliseconds. Was measured using a liquid crystal voltage holding ratio measurement system (manufactured by Micronics, product name “MZ1800”) and evaluated according to the following four criteria.

A: VHR is 98% or more.
B: VHR is 95% or more and less than 98%.
C: VHR is 90% or more and less than 95%.
D: VHR is smaller than 90%.
These results are shown in Table 3.

As is apparent from Table 3, when the color filter ink of the present invention was used, it was possible to discharge stably and accurately, and even when discharging over a long period of time, the discharge stability was excellent. In addition, the obtained color filter suppressed the occurrence of color mixing, color unevenness, density unevenness, and light leakage, and variation in characteristics among individuals was small. Moreover, when the color filter ink of the present invention was used, a colored portion having a uniform thickness could be easily formed. In addition, the image display device provided with the color filter manufactured using the color filter ink of the present invention has an excellent voltage holding ratio. On the other hand, in the comparative example, a satisfactory result was not obtained.
Further, when a commercially available liquid crystal television was disassembled and the liquid crystal display device part was replaced with one manufactured as described above, and the same evaluation as described above was performed, the same result as above was obtained.

It is sectional drawing which shows suitable embodiment of the color filter of this invention. It is sectional drawing which shows the manufacturing method of a color filter. It is a perspective view which shows the droplet discharge apparatus used for manufacture of a color filter. It is the figure which observed the droplet discharge means in the droplet discharge apparatus shown in FIG. 3 from the stage side. It is a figure which shows the bottom face of the droplet discharge head in the droplet discharge apparatus shown in FIG. It is a figure which shows the droplet discharge head in the droplet discharge apparatus shown in FIG. 3, (a) is a cross-sectional perspective view, (b) is sectional drawing. It is sectional drawing which shows embodiment of a liquid crystal display device. 1 is a perspective view showing a configuration of a mobile (or notebook) personal computer to which an electronic apparatus of the present invention is applied. It is a perspective view which shows the structure of the mobile telephone (PHS is also included) to which the electronic device of this invention is applied. It is a perspective view which shows the structure of the digital still camera to which the electronic device of this invention is applied.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Color filter 11 ... Board | substrate 12 ... Coloring part 12A ... 1st coloring part 12B ... 2nd coloring part 12C ... 3rd coloring part 13 ... Partition 14 ... Cell 2 ... Color filter ink 3 ... Coating film 60 ... Liquid crystal display device 61 ... Common electrode 62 ... Liquid crystal layer 63, 64 ... Alignment film 65 ... Pixel electrode 66 ... Substrate (counter substrate) 67, 68 ... Polarizing plate 100 ... Droplet discharge device 101 ... Tank 102 ... Discharge scanning unit 103 ... Droplet discharge means 104 ... first position control device 105 ... carriage 106 ... stage 108 ... second position control device 110 ... tube 112 ... control means 114 ... droplet discharge head (inkjet head) 116A, 116B ... nozzle array 118 ... nozzle 120 ... cavity 122 ... partition wall 124 ... vibrator 124A, 124B ... electrode 12 C ... Piezo element 126 ... Diaphragm 127 ... Discharge unit 128 ... Nozzle plate 129 ... Liquid pool 130 ... Supply port 131 ... Hole 1000 ... Image display device 1100 ... Personal computer 1102 ... Keyboard 1104 ... Main body 1106 ... Display unit 1200 ... Cellular phone 1202 ... operation buttons 1204 ... earpiece 1206 ... mouthpiece 1300 ... digital still camera 1302 ... case (body) 1304 ... light receiving unit 1306 ... shutter button 1308 ... circuit board 1312 ... video signal output terminal 1314 ... for data communication Input / output terminal 1430 ... TV monitor 1440 ... Personal computer

Claims (12)

A color filter ink used in the production of an ink jet color filter,
A colorant, a liquid medium in which the colorant is dissolved and / or dispersed, and a resin material,
A color filter ink having a hydroxyl value of 0.16 to 0.56 KOHmg / g.   The color filter ink according to claim 1, wherein the hydroxyl value of the resin material contained in the color filter ink is 0.1 to 15.0 KOH mg / g.   The color filter ink according to claim 1, wherein the resin material includes an epoxy resin.   The color filter ink according to any one of claims 1 to 3, wherein a content of the resin material in the color filter ink is 0.5 to 10 wt%.   The color filter ink according to any one of claims 1 to 4, wherein a content of the liquid medium in the color filter ink is 70 to 98 wt%.   The liquid medium is 4-methyl-1,3-dioxolan-2-one, 2- (2-methoxy-1-methylethoxy) -1-methylethyl acetate, triethylene glycol diacetate, bis (2-butoxy Ethyl) ether, 1,3-butylene glycol diacetate, diethylene glycol monobutyl ether acetate, triethylene glycol butyl methyl ether, ethyl 3-ethoxypropionate, diethylene glycol diethyl ether, propylene glycol n-butyl ether, triethylene glycol dimethyl ether The color filter ink according to any one of claims 1 to 4, comprising one or more selected from the group consisting of:   The color filter ink according to any one of claims 1 to 6, wherein the color filter ink is ejected as droplets from a nozzle whose surface is covered with a silica film having a fluoroalkyl group. A color filter ink set obtained by combining a plurality of colors of the color filter ink according to claim 1,
Among multiple color color filter inks, the difference between the hydroxyl value of the color filter ink having the highest hydroxyl value and the hydroxyl value of the color filter ink having the lowest hydroxyl value is 0.12 KOHmg / g or less. An ink set for color filters.   A color filter manufactured using the color filter ink according to claim 1.   An image display device comprising the color filter according to claim 9.   The image display device according to claim 10, wherein the image display device is a liquid crystal panel.   An electronic apparatus comprising the image display device according to claim 10.

Images