JP2009237467A - Method of manufacturing color filter substrate with spacer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of inexpensively and precisely disposing and fixing spacer particles in prescribed positions of a color filter formed on a transparent substrate by using inkjet printing. <P>SOLUTION: A method of manufacturing a color filter substrate with spacers, which has spacer particles fixed in prescribed positions on a color filter, includes at least: a step (1) of preparing spacer ink wherein spacer particles are dispersed in at least a solvent; a step (2) of forming an engraved plate which has recesses formed in positions corresponding to the prescribed positions and is subjected to surface treatment which develops a phenomenon that spacer particles are gathered into the recesses during ink drying process when the spacer ink is supplied; a step (3) of selectively supplying the spacer ink to the recessed of the engraved plate by inkjet printing and drying the spacer ink; and a step (4) of transferring and fixing spacer particles gathered in the recesses to the prescribed position on the color filter. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  In the present invention, a liquid crystal display spacer is selectively disposed and fixed on a light shielding portion (black matrix) of a color filter substrate by an ink jet method, and a liquid crystal display with high display quality free from light leakage or display unevenness due to the spacer is provided. The present invention relates to a spacer ink that can be manufactured and a method of manufacturing a color filter substrate with a spacer using the spacer ink.

  Currently, liquid crystal displays are widely used in personal computers, portable electronic devices, and the like. In this liquid crystal display, the spacer plays a role of maintaining the liquid crystal layer at a constant interval and maintaining an appropriate thickness of the liquid crystal layer.

  In a conventional liquid crystal display manufacturing method, since bead spacers (hereinafter referred to as spacer particles) are dispersed and arranged on a color filter substrate on which pixel electrodes are formed, position control is impossible, resulting in random Therefore, spacer particles are also arranged in the pixel portion of the liquid crystal display.

  A color filter substrate used in a horizontal electric field type liquid crystal display has a structure in which a pixel electrode is not formed on a color filter but only a color filter or an overcoat layer is formed thereon. Also in this case, spacer particles are arranged in the pixel portion.

  The spacer particles are generally made of synthetic resin, glass, or the like, and when the spacer particles are arranged in the pixel portion, light leaks from the spacer particle portion due to polarization depolarization. Further, light leaks due to disorder of the alignment of the liquid crystal on the surface of the spacer particles. As a result, there is a problem that the display quality deteriorates due to a decrease in contrast and color tone.

  In order to solve the problem associated with such random dispersion of spacer particles, it is necessary to dispose the spacer in the light shielding layer portion. As a method for arranging the spacer only at a specific position as described above, a number of formation methods by photolithography and ink jet printing have been proposed.

  The photolithographic method is a main manufacturing method for color filter substrate formation. A photosensitive resist is applied on the entire surface of the substrate, and then exposed and developed through a mask on which a pattern design is drawn, and then a color filter pattern is formed in sequence. It is a way to do.

  Since this method is excellent in positional accuracy, dimensional accuracy, and manufacturing stability, numerous patent applications for use in forming spacers have been made. For example, in Patent Documents 1 to 4, regarding the photosensitive resin composition, Compositions corresponding to improvement in developability and reduction in deformation have been proposed. However, the photolithographic method is a method in which an arbitrary pattern is formed by developing after exposure through a mask. Especially in the spacer formation, since the pattern forming portion is less than 1%, the material loss is very large. There is a disadvantage that it is large.

  On the other hand, inkjet printing is a printing method with excellent material efficiency that can give a necessary amount to a necessary portion from a minute nozzle of several tens of μm.

This method is capable of printing a micropattern of an arbitrary design in combination with a precision stage without using an indirect member such as an intaglio, and has recently been actively developed in liquid crystal related technologies. For example, Patent Documents 5 to 7 propose a method in which a spacer is directly arranged at an arbitrary position. However, in order to eject spacer particles of several microns, one having a large inkjet nozzle diameter must be selected, and the droplet diameter formed on the substrate is approximately 50 μm. Even if the spacer particles are accurately arranged by ink jet printing on the light shielding film, it is difficult to control the position of the spacer particles in the droplet after drying. In mobile applications where the light shielding part (black matrix) has a narrow line width of about 10 μm, it is difficult to selectively dispose spacer particles on the light shielding part.

Patent documents are shown below.
JP 2007-206328 A JP 2007-204588 A JP 2007-65640 A JP 2006-27696 A Japanese Patent Laid-Open No. 2001-83524 JP 2001-188235 A JP-A-9-105946

  An object of the present invention is to provide a method for arranging and fixing spacer particles at a predetermined position on a color filter formed on a transparent substrate at low cost with high accuracy using ink jet printing.

In order to achieve the above object in the present invention, first, the invention of claim 1 is a color filter substrate with a spacer formed by fixing spacer particles at predetermined positions of a color filter substrate having a color filter formed on a transparent substrate. It is a manufacturing method, Comprising: It is a manufacturing method of the color filter substrate with a spacer characterized by having the following processes at least.
(1) A step of preparing a spacer ink in which spacer particles are dispersed in at least a solvent. (2) A concave portion is formed at a position corresponding to the predetermined position, and when the spacer ink is supplied, an intaglio plate subjected to surface processing that expresses a phenomenon in which spacer particles gather in the concave portion during the drying process of the ink is created. Process.
(3) A step of selectively supplying spacer ink to the recesses of the intaglio plate by ink jet printing and drying.
(4) A step of performing alignment with alignment marks on both the intaglio plate and the color filter substrate, and then transferring and fixing the spacer particles gathered in the recesses to predetermined positions on the color filter.

  The invention according to claim 2 is the method for producing a color filter substrate with a spacer according to claim 1, wherein the depth of the concave portion of the intaglio is not more than ½ of the particle diameter of the spacer.

  The invention according to claim 3 is characterized in that the color filter substrate has a light shielding film and the diameter of the concave portion of the intaglio is 30 to 100% of the width of the light shielding film on the color filter substrate. It is a manufacturing method of the color filter substrate with a spacer of description.

  The invention according to claim 4 is characterized in that the surface treatment is performed so that the contact angle of the dispersion solvent of the spacer ink on the surface of the intaglio is 100 degrees or more. It is a manufacturing method of a color filter substrate with a spacer.

The invention according to claim 5 is the method for producing a color filter substrate with a spacer according to any one of claims 1 to 4, wherein spacer particles whose surfaces are coated with a heat-adhesive resin are used.

  The invention of claim 6 is the method for producing a color filter substrate with a spacer according to any one of claims 1 to 5, wherein the intaglio substrate comprises a glass substrate.

  The invention according to claim 7 is characterized in that at least one of the intaglio plate side and the color filter substrate side is heated when transferring the spacer particles gathered in the recesses to a predetermined position on the color filter. It is a manufacturing method of the color filter board | substrate with a spacer of any one.

  According to an eighth aspect of the present invention, the spacer ink is a water-soluble organic solvent having a dispersion solvent main component having a boiling point of 150 ° C. or higher, and the spacer particles have a particle diameter of 3 to 6 μm, and the content thereof is 1.0. The color filter with a spacer according to any one of claims 1 to 7, wherein the color filter has a mass% or less, a viscosity at 23 ° C of 20 mPa · s or less, and a surface tension of 40 mN / m or less. A method for manufacturing a substrate.

  The invention according to claim 9 is characterized in that the spacer ink includes an adhesive component whose main component is a resin that is cured by at least one energy of heat, light, and electron beam. The manufacturing method of the color filter substrate with a spacer of any one of these.

The invention according to claim 10 is characterized in that the number density of spacer particles fixed at a predetermined position of the color filter substrate is 1000 to 20000 particles / cm ² . It is a manufacturing method of a color filter substrate with a spacer.

  The invention of claim 11 is characterized in that the spacer is sequentially transferred from the intaglio to the color filter substrate while intermittently feeding out the color filter base plate using the long flexible base material. A method for producing a color filter substrate with a spacer according to claim 1.

  Since the present invention has the above features, the following effects are obtained.

  According to the first aspect of the present invention, ink in which spacer particles are dispersed in a solvent is selectively selected by inkjet printing in a concave portion of an intaglio in which a concave portion is formed at a position corresponding to a predetermined position on a color filter formed on a transparent substrate. After the spacer particles are accurately arranged on the pattern portion of the intaglio using the phenomenon that the spacer particles gather in the intaglio portion during the ink drying process, both the alignment marks on the color filter side and the intaglio side are used to By aligning and transferring the spacer particles to a predetermined pattern position on the color filter, it is possible to reduce the material used by inkjet printing and to arrange the spacer at the predetermined pattern position.

  According to the invention according to claim 2, when the intaglio plate depth is ½ or less of the spacer particle diameter, the collective phenomenon that acts in the drying process of the spacer ink landed in a wide area including the concave pattern formed on the intaglio plate. This makes it possible to improve the transferability of the spacer particles to the color filter substrate side.

  According to the invention of claim 3, the diameter of the concave portion of the intaglio is 30 to 100% of the width of the light shielding film on the color filter, so that the spacer particles can be accurately placed on the light shielding portion on the color filter. It becomes.

  According to the invention of claim 4, the surface of the intaglio plate is subjected to a surface treatment so that the contact angle of the dispersion solvent of the spacer ink is 100 degrees or more. Since it is repelled from the surface of the intaglio plate to promote the movement of the spacer particles, it is possible to promote the aggregation phenomenon of the spacer particles into the recesses provided on the intaglio plate.

  According to the fifth aspect of the present invention, the spacer can be fixed to the non-adhesive color filter surface, for example, the electrode layer, without adding an adhesive resin to the spacer ink.

  According to the invention of claim 6, since a glass plate is used as the intaglio substrate, even when heating or pressurization is used in the transfer process of the spacer particles arranged on the intaglio, the substrate shrinks or expands. The positional deviation can be reduced.

  According to the seventh aspect of the present invention, it is possible to improve the transferability by applying heat to at least one of the intaglio side or the color filter substrate side in the transfer step of the spacer particles arranged on the intaglio.

  According to the invention according to claim 8, the dispersion solvent of the spacer ink is mainly composed of a water-soluble organic solvent having a boiling point of 150 ° C. or higher, the spacer particles have a particle diameter of 3 to 6 μm, and the content thereof is 1.0% by mass or less. The ink has a viscosity of 20 mPa · s or less and a surface tension of 40 mN / m or less at 23 ° C., enabling accurate and stable ejection even when using a general inkjet head. It becomes.

  According to the invention according to claim 9, the spacer ink includes an adhesive component mainly composed of a resin, and these are cured with at least one energy of heat, light, and electron beam, whereby a color filter substrate The spacer particles transferred thereon are fixed. As a result, it is possible to reliably prevent detachment even after a post process or panel formation. This is particularly effective when the spacer particles are fixed on a transparent electrode such as ITO.

According to the invention of claim 10, in the method for manufacturing a color filter substrate with a spacer, the number density of spacer particles selectively disposed on a predetermined pattern position of the color filter substrate is 1000 to 20000 particles / cm ^2. It can be used for products without unevenness of the cell thickness due to the panel formation, and without any obstacle in the application of the alignment film or liquid crystal in the panel formation process.

  According to the eleventh aspect of the present invention, the spacer can be continuously transferred and fixed to the color filter base plate using the flexible substrate. Compared with spacer formation by a photolithographic method or the like, it is possible to manufacture a color filter substrate that is less expensive and has a uniform cell gap.

  Hereinafter, the best mode for carrying out the present invention will be described in detail.

  As a material of the intaglio substrate used in the present invention, a glass substrate such as soda glass or non-alkali glass, plastic, or the like can be used. Further, by using a light-transmitting substrate, alignment can be facilitated during pattern superposition. For example, films and sheets of polyethylene terephthalate, polyethylene naphthalate, polyethersulfone, cycloolefin polymer, polyimide, nylon, aramid, polycarbonate, polymethyl methacrylate, polyvinyl chloride, triacetyl cellulose, etc. can be used. A glass substrate is preferable from the viewpoint of stability.

  As a method for forming a concave portion of an intaglio plate according to the present invention, a photosensitive resin is applied to the surface of a plate material, a concave pattern is exposed and developed through a mask, and then formed by an existing dry etching treatment, wet etching treatment, or sand blasting. By using the treatment, a plate having a plate depth of 0.3 μm to 5 μm can be used according to the spacer particle diameter and installation density to be used.

  In addition, it is also possible to use a material in which a photosensitive resin is applied to the surface of the intaglio, a recess pattern is formed through a mask, and a recess having a thickness of 0.3 to 5 μm is provided.

  The thickness of the spacer layer formed by inkjet printing is preferably 2 μm to 5 μm depending on the spacer particle diameter and installation density used.

  The spacer ink supplied to the concave portion of the intaglio by ink-jet printing is divided into cases where it gathers in one place on the contrary to the case of spreading on the intaglio depending on the magnitude relationship between the surface tension of the spacer ink and the surface tension of the intaglio plate. The present invention can be used when gathering in one place, that is, when the surface tension of the spacer ink is greater than the surface tension of the intaglio surface. When this relationship is satisfied, the volume of the spacer ink supplied to the concave portion of the intaglio decreases as the solvent volatilizes. Even if the spacer ink is supplied to the periphery of the recess, it collects in the recess as the volume decreases. At that time, the spacers also gather together in the recess.

  As a method of increasing the surface tension of the spacer ink, there is a method of using a solvent having a high surface tension and an adhesive resin component. On the other hand, as a method of reducing the surface tension of the intaglio surface, there is a method of forming a layer having a low surface tension on the intaglio surface.

  As the low surface tension layer provided on the surface of the intaglio, a release agent represented by silicone oil and silicone varnish may be used, or a thin silicone rubber may be provided. For the same purpose, fluorine-based resins and fluorine-based rubbers may be used, or the fluororesin fine powder may be mixed with silicone rubber or ordinary rubber to obtain peelability.

  Specific silicones include dimethylpolysiloxanes with various molecular weights, other methylhydropolysiloxanes, methylphenylsilicone oils, methylchlorinated phenylsilicone oils, or copolymers of these polysiloxanes with organic compounds. Can be used. Silicone rubber is a combination of two-component diorganopolysiloxane and a tri- or higher functional silane as a crosslinking agent, or a combination of siloxane and a curing catalyst, or one-component diorganopolysiloxane, acetone oxime, and various methoxys. Combinations of silane, methyltriacetoxysilane, and the like are used, and other polysiloxanes for adjusting rubber hardness are appropriately used.

  As a method for forming the low surface tension layer on the surface of the intaglio, a known coating method can be used depending on the viscosity of the coating liquid for forming the low surface tension layer and the drying property of the solvent. Examples include spin coating, dipping, roll coating, gravure coating, reverse coating, air knife coating, comma coating, die coating, screen printing, spray coating, and gravure offset. Among them, the die coat, cap coat, roll coat, and applicator can form a uniform ink liquid film for ink having a wide range of viscosity.

  As long as the spacer ink can be supplied to the concave portion of the intaglio by inkjet printing, not only the surface of the intaglio plate but also the inside of the concave portion may be a low surface tension layer.

As the water-soluble organic solvent used in the spacer forming ink of the present invention, those having a boiling point of 150 ° C. or higher, preferably 180 ° C. or higher are used, and one or a mixture of two or more can be used.

  Examples of the water-soluble organic solvent used in the present invention include glycerin, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, hexylene glycol, 1,4-butanediol, 1,5-pentanediol, 1, High boiling point and low volatility polyhydric alcohols such as 2,4-butanetriol, 2,2′-thiodiethanol, polyethylene glycol, polypropylene glycol, etc. are used, and N-methyl-2-pyrrolidone, 1,3- Water-soluble such as dimethylimidazolidinone, monoethanolamine, N, N-dimethylethanolamine, N, N-diethylethanolamine, diethanolamine, Nn-butyldiethanolamine, triisopropanolamine, triethanolamine It can be added to the solvent.

  Moreover, it is preferable that the addition amount of the water-soluble organic solvent whose boiling point is 150 degreeC or more in this invention is 50-90 mass%. When the added amount is 50% by mass or less, the volatility of the spacer forming ink is increased, and the ink stability is lowered. When the added amount is 90% by mass or more, the viscosity of the spacer forming ink is increased. This is not preferable because it causes a discharge failure.

  As the spacer particles used in the spacer forming ink of the present invention, spherical particles having a particle diameter of 3 to 6 μm can be used alone or in combination of two or more.

  The material for the spacer particles is not particularly limited, and examples thereof include resins, organic substances, inorganic substances, and compounds and mixtures thereof. The resin is not particularly limited. For example, polyethylene, polypropylene, polymethylpentene, polyvinyl chloride, polytetrafluoroethylene, polystyrene, polymethyl methacrylate, polyethylene terephthalate, polybutylene terephthalate, polyamide, polyimide, polysulfone, polyphenylene oxide. Linear or cross-linked polymer such as polyacetal; epoxy resin, phenol resin, melamine resin, benzoguanamine resin, unsaturated polyester resin, divinylbenzene polymer, divinylbenzene-styrene copolymer, divinylbenzene-acrylate copolymer Examples thereof include resins having a crosslinked structure such as a polymer, diallyl phthalate polymer, and triallyl isocyanurate polymer. Moreover, silica etc. are mentioned as an inorganic substance.

  The solid content concentration of the spacer particles in the spacer dispersion of the present invention is not particularly limited, but is preferably 0.2 to 3% by mass of the entire dispersion, for example.

  When the solid content concentration of the spacer particles in the spacer forming ink is less than 0.2% by mass, the discharged droplets are not likely to contain the spacer particles, and the spacer particle density on the color filter substrate is reduced. If it exceeds 3% by mass, the spacer particles agglomerate, clogging the nozzles of the inkjet head, and the content of the spacer particles in the ejected droplets tends to be excessive, which is not preferable.

Examples of the adhesive resin component in the spacer ink of the present invention include polyacrylic acid ester, polymethacrylic acid ester, polyethylacrylic acid ester, styrene-butadiene copolymer, butadiene copolymer, acrylonitrile-butadiene copolymer. , Chloroprene copolymer, cross-linked acrylic resin, cross-linked styrene resin, fluorine resin, vinylidene fluoride, benzoguanamine resin, phenol resin, polyolefin resin, cellulose, styrene-acrylate copolymer, styrene-methacrylate copolymer , Polystyrene, styrene-acrylamide copolymer, n-isobutyl acrylate, acrylonitrile, vinyl acetate, acrylamide, silicone resin, polyvinyl acetal, polyamide, rosin resin, polyethylene, poly -Bonate, vinylidene chloride resin, polyvinyl alcohol, cellulose resin, epoxy resin, vinyl acetate resin, ethylene-vinyl acetate copolymer, vinyl acetate-acrylic copolymer, vinyl chloride resin, polyurethane, etc. Is not to be done. Those obtained by adding a reactive site such as an acrylic group, a carboxyl group or an isocyanate group to these resin components, and those obtained by adding a crosslinking agent, a photoinitiator or the like to these can be used as the curable resin.

  Moreover, the addition amount of the adhesive resin component in this invention is 0.2-10 mass% according to the addition amount of spacer particle | grains, and it is preferable that it is the same amount or more as spacer particle | grains. If the addition amount is 0.2% by mass or less, the fixing property on the color filter substrate is poor, and if it is 10% by mass or more, the viscosity of the spacer ink is remarkably increased, and the ink head causes nozzle clogging. It is not preferable.

  If necessary, alcohols or surfactants are used for the purpose of controlling the wettability between the surface of the color filter substrate (including the overcoat layer and electrode layer) and the inkjet head and the spacer ink. The above can be mixed and used.

  As alcohols, methyl alcohol, ethyl alcohol, n-propyl alcohol, i-propyl alcohol, etc. can be used, and as the surfactant, one kind of water-soluble anionic, cationic, amphoteric, nonionic surfactant is used. Or multiple types can be added.

  In the spacer ink of the present invention, it is preferable that the spacer particles are dispersed in the form of single particles, and various additives such as a tackifier, a viscosity modifier, and a pH adjuster are provided as long as the effects thereof are not impaired. An agent, a surfactant, an antifoaming agent, an antioxidant, a heat stabilizer, a light stabilizer, an ultraviolet absorber, and a colorant may be added.

  In the present invention, the spacer particles are supplied to predetermined positions on the intaglio by inkjet printing. Ink jet printing is classified into two types, a continuous jet method and a drop-on-demand method, according to the principle of ink droplet generation. In the present invention, any method can be preferably employed.

  The continuous jet method is a method in which ink droplets are continuously generated and ink droplets are selected according to a recording signal to perform recording, and there are a Sweet type, a microdot type, a Herz type, an IRIS type, and the like. The drop-on-demand method is a method in which a spacer dispersion liquid is ejected according to a recording signal, and includes a pressure pulse method, a thermal jet method, an ERF method, and the like.

  The structure of the liquid crystal display is a structure in which liquid crystal is sealed between two substrates. Usually, the spacer particles of the present invention are arranged on one substrate in a transfer process via an intaglio. Then, a liquid crystal display element is manufactured by overlapping with the other substrate. The intaglio substrate is preferably made of the same material as that of the color filter substrate having the light shielding portion from the viewpoint of alignment.

  If necessary, the color filter substrate on which the spacer is formed may be subjected to a surface treatment for the purpose of controlling the wettability with the spacer ink. As the surface treatment method, any method such as corona treatment, atmospheric pressure plasma treatment, or UV ozone treatment can be selected.

  The color filter substrate that can be used in the present invention may use a glass plate, a plastic plate, or a plastic film as the substrate. Further, an overcoat layer or / and a pixel electrode may be formed on the pixel of the color filter or on the light shielding part, or the colored pixel and the light shielding part may be exposed.

  The present invention is particularly suitable when applied to a color filter substrate for a liquid crystal display, but can also be used for applications in which spacer particles are fixed at predetermined positions. For example, it can be used for fixing spacers such as various display elements and touch switches.

The arrangement position of the spacer particles on the color filter substrate is not particularly limited, and may be a random arrangement or a pattern arrangement in which a pattern is arranged at a specific position. From the viewpoint of suppressing deterioration in display quality such as light leakage caused by the spacer particles, it is preferable to arrange the spacer particles in the non-display portion of the panel. Further, the density of the spacer particles on the substrate is not particularly limited, but it is usually preferably 1000 to 20000 in a 1 cm ² region.

  The first method for fixing the spacer particles on the color filter (including the overcoat layer and the electrode) is to include an adhesive resin in the spacer ink. Further, as a material for the pixel portion, the light shielding portion, and the overcoat layer of the color filter, a material capable of fixing the spacer particles when heated may be used. It is fixed by heating at the time of transfer or afterwards. Further, spacer particles having a surface coated with a heat-adhesive resin may be used. As the thermal adhesive resin, one that does not dissolve in the solvent of the spacer ink is used.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to these examples.

<Example 1>
(Preparation of spacer ink)
While stirring the polyvinyl acetal resin (manufactured by Sekisui Chemical Co., Ltd., KW-1, solid content 20% by mass), the epoxy compound (manufactured by Nagase ChemteX, Denacol EX-521) is added in a small amount with an addition amount of 5% by mass in terms of the solid content ratio. By adding each, a thermosetting polymer solution was prepared. Subsequently, a mixed solvent of spacer particles (manufactured by Sekisui Chemical Co., Ltd., Micropearl EX004, particle diameter 4 μm), the thermosetting polymer liquid, ethylene glycol / butyl cellosolve / water = 65/5/30 (mass ratio) is mixed with spacer particles / Polymer solution / mixed solvent = 0.2 / 5 / 94.8 (mass ratio) was mixed and ultrasonically dispersed, and filtered through a stainless mesh having an aperture of 10 μm to obtain the spacer ink of Example 1. The viscosity of the obtained dispersion was 13.4 mPa · s (23 ° C.).

(Creation of glass intaglio)
A positive resist (Shipley, S1813) is applied to non-alkali glass (Corning, 1737 glass, 300 mm square, 1.1 mm thickness) by spin coating, and a color having various resolution patterns with a light shielding part width of 10 to 30 μm. A pattern is formed by exposing through a mask designed with a pattern with an opening width of 10 to 30 μm so that it can be placed on the light shielding part of the filter substrate, and developing with an alkaline developer (MFCD-26, manufactured by Shipley). did. The opening portion of this pattern was etched with hydrofluoric acid to a plate depth of 0.5 μm, and the resist was stripped with a resist stripping agent (manufactured by Shipley, remover 1165) to obtain a glass intaglio. A surface treatment layer was provided on the glass intaglio by dip coating a fluorine-based water repellent treatment agent (manufactured by 3M, EGC-1720) and drying at 80 ° C. for 30 minutes.

(Spacer formation on the color filter substrate)
The spacer ink was vacuum degassed in an inkjet printing apparatus equipped with a piezo-type inkjet head having a discharge amount of 40 pl, a nozzle diameter of 42 μm, and a precision stage having an alignment mechanism, and then the glass intaglio was aligned after filling. Thereafter, a spacer ink droplet was supplied to a position corresponding to the concave portion and dried on a hot plate at 80 ° C. for 1 minute. This plate is mounted on a transfer device having an upper and lower substrate alignment mechanism, and after aligning the color filter substrate and the glass intaglio, the glass plate side is heated with 100 ° C. while being heated with a roller, and then peeled off. Transfer processing was performed. The color filter substrate on which the spacer was formed was cured at 120 ° C. for 30 minutes to obtain a color filter substrate with a spacer.

<Example 2>
The same procedure as in Example 1 was performed, except that an intaglio using a glass plate as a substrate was prepared under the following conditions different from those in Example 1.

(Creation of intaglio using glass plate as substrate)
First, 100 parts by mass of an acrylate resin (manufactured by Daicel Chemical Industries, Ltd .: trade name “Cyclomer P-ACA200M”) as an alkali-soluble resin, and dipentaerythritol hexaacrylate (Toagosei Co., Ltd.) as a photopolymerizable monomer Company: Trade name: M400) 30 parts by mass, Irgacure 369 (manufactured by Ciba Special Chemical) as a photopolymerization initiator, 6 parts by mass, and 300 parts by mass of propylene glycol monomethyl ether acetate as a diluting solvent are diluted by stirring. Thus, a negative resist composition was prepared.

  The negative resist composition was applied to alkali-free glass (Corning, 1737 glass, 300 mm square, 1.1 mm thickness) by spin coating so that the film thickness after drying was 1.0 μm, and the light shielding part width was 10 to 30 μm. By exposing and developing through a mask designed with a pattern with an opening width of 10 to 30 μm so that a spacer can be placed on the light shielding portion of the color filter substrate having various resolution patterns, and curing at 210 ° C. for 1 hour. Then, a recess was formed on the glass substrate, and an intaglio plate having a glass plate as a substrate and a recess formed with negative resist was obtained.

  Spin coating of two-component release silicone resin (Momentive Performance Materials Japan, TPR-6712, CM630 hardener 1% by weight, diluted 4 times with toluene) on the intaglio plate with this glass plate as substrate The film was dried so as to have a film thickness of 0.5 μm, and a surface treatment layer was provided by curing at 200 ° C. for 20 minutes.

<Example 3>
The method was the same as in Example 1 except that the glass intaglio was prepared under the following conditions.

(Creation of glass intaglio)
A positive resist (Shipley, S1813) is applied to non-alkali glass (Corning, 1737 glass, 300 mm square, 1.1 mm thickness) by spin coating, and a color having various resolution patterns with a light shielding part width of 10 to 30 μm. The pattern is obtained by exposing through a mask designed with a pattern having an opening width of 10 to 30 μm so that a spacer can be arranged on the light shielding part of the filter substrate, and developing with an alkali developer (MFCD-26, manufactured by Shipley). Formed. The opening portion of this pattern was etched with hydrofluoric acid to a plate depth of 0.5 μm, and the resist was stripped with a resist stripping agent (manufactured by Shipley, remover 1165) to obtain a glass intaglio.

  On this glass intaglio, a two-part release silicone resin (manufactured by Momentive Performance Materials Japan, TPR-6712, 1% by mass of CM630 curing agent, diluted 4-fold with toluene) is spin-coated to dry the film thickness. Was applied to a thickness of 0.5 μm and cured at 200 ° C. for 20 minutes to provide a surface treatment layer.

<Example 4>
The same method as in Example 1 was performed except that an intaglio plate having a glass plate as a substrate was prepared under the following conditions.

(Creation of intaglio using glass plate as substrate)
First, 100 parts by mass of an acrylate resin (manufactured by Daicel Chemical Industries, Ltd .: trade name “Cyclomer P-ACA200M”) as an alkali-soluble resin, and dipentaerythritol hexaacrylate (Toagosei Co., Ltd.) as a photopolymerizable monomer Company: Trade name: M400) 30 parts by mass, Irgacure 369 (manufactured by Ciba Special Chemical) as a photopolymerization initiator, 6 parts by mass, and 300 parts by mass of propylene glycol monomethyl ether acetate as a diluting solvent are diluted by stirring. Thus, a negative resist composition was prepared.

  The negative resist composition was applied to non-alkali glass (Corning, 1737 glass, 300 mm square, 1.1 mm thickness) by spin coating so that the film thickness after drying was 0.5 μm, and the light shielding part width was 10 to 30 μm. Exposure and development through a mask designed with a pattern with an opening width of 10 to 30 μm so that a spacer can be placed on the light-shielding part of the color filter substrate having various resolution patterns, and cured in an environment of 210 ° C. for 1 hour Thus, a pattern was formed on the glass substrate, and an intaglio plate having a glass plate as a substrate and a recess formed with a negative resist was obtained.

  A surface treatment layer was provided on the intaglio using this glass plate as a substrate by dip-coating a fluorine-based water repellent treatment agent (manufactured by 3M, EGC-1720) and drying at 80 ° C. for 30 minutes.

<Comparative Example 1>
The spacer ink was vacuum defoamed in an inkjet printing apparatus equipped with a precision ink jet head having an ejection amount of 40 pl, a nozzle diameter of 42 μm, and a precision stage having an alignment mechanism, and a spacer ink prepared by the same method as in Example 1. After filling and alignment of the color filter substrate, spacer ink droplets are sprayed directly to a predetermined position on the light-shielding portion, and then dried on a hot plate at 80 ° C. for 1 minute. It was. The color filter substrate on which the spacer was formed was cured at 120 ° C. for 30 minutes to obtain a color filter substrate with a spacer.

  In the color filter substrate with spacers obtained as described above, the spacer placement accuracy on the light shielding portion (width 10, 20, 30 μm) in the color filter was evaluated based on the following criteria by microscopic observation.

○: Presence rate on the pixel portion is 10% or less Δ: Presence rate on the pixel portion is 10% or more and less than 50% ×: Presence rate on the pixel portion is 50% or more Also, on the color filter substrate of the formed spacer The sticking property to water was evaluated based on the following criteria under conditions of 0.25 MPa and 30 sec using water as a fluid with an air brush.

○: Peeling part is 10% or less Δ; Peeling part is 10% or more and less than 30% ×: Peeling part is 30% or more Table 1 shows a list of evaluation results of Examples 1 to 4 and Comparative Example 1 based on the above evaluation criteria. Shown in

表１において、スペーサーの固着性は、実施例１〜４、比較例１のいずれにおいても良好であった。しかし、スペーサーが遮光部から逸脱して画素部へはみ出した割合は、実施
例１〜４では１０％以下であるのに対して、比較例では遮光部の幅が３０μｍの場合で１０〜５０％であり、幅が２０μｍ、１０μｍの場合には５０％以上であった。

In Table 1, the fixing property of the spacer was good in any of Examples 1 to 4 and Comparative Example 1. However, the ratio of the spacer deviating from the light shielding portion and protruding to the pixel portion is 10% or less in Examples 1 to 4, whereas in the comparative example, 10 to 50% when the width of the light shielding portion is 30 μm. When the width was 20 μm and 10 μm, it was 50% or more.

Claims (11)

A method for producing a color filter substrate with a spacer, wherein spacer particles are fixed to a predetermined position of a color filter substrate having a color filter formed on a transparent substrate, and having at least the following steps: A method for manufacturing a color filter substrate. (1) A step of preparing a spacer ink in which spacer particles are dispersed in at least a solvent. (2) A concave portion is formed at a position corresponding to the predetermined position, and when the spacer ink is supplied, an intaglio plate subjected to surface processing that expresses a phenomenon in which spacer particles gather in the concave portion during the drying process of the ink is created. Process.
(3) A step of selectively supplying spacer ink to the recesses of the intaglio plate by ink jet printing and drying.
(4) A step of performing alignment with alignment marks on both the intaglio plate and the color filter substrate, and then transferring and fixing the spacer particles gathered in the recesses to predetermined positions on the color filter.   The method for producing a color filter substrate with a spacer according to claim 1, wherein the depth of the concave portion of the intaglio is not more than ½ of the particle diameter of the spacer.   The color filter substrate with a spacer according to claim 1 or 2, wherein the color filter substrate has a light shielding film, and the diameter of the concave portion of the intaglio is 30 to 100% of the width of the light shielding film on the color filter substrate. Manufacturing method.   The production of the color filter substrate with a spacer according to any one of claims 1 to 3, wherein the surface treatment is performed so that the contact angle of the dispersion solvent of the spacer ink on the surface of the intaglio is 100 degrees or more. Method.   The method for producing a color filter substrate with a spacer according to claim 1, wherein spacer particles whose surfaces are coated with a heat-adhesive resin are used.   The method for producing a color filter substrate with a spacer according to any one of claims 1 to 5, wherein the intaglio substrate comprises a glass substrate.   The at least one of the intaglio side and the color filter substrate side is heated when transferring the spacer particles gathered in the concave portion to a predetermined position on the color filter. Manufacturing method of color filter substrate with spacer.   The spacer ink is a water-soluble organic solvent having a main component of the dispersion solvent having a boiling point of 150 ° C. or more, the particle diameter of the spacer particles is 3 to 6 μm, and the content thereof is 1.0% by mass or less. 8. The method for producing a color filter substrate with a spacer according to claim 1, wherein the viscosity at 23 ° C. is 20 mPa · s or less and the surface tension is 40 mN / m or less.   The said spacer ink contains the adhesion | attachment component which has as a main component the resin hardened | cured with at least 1 or more energy of a heat | fever, light, and an electron beam. Of manufacturing a color filter substrate with a spacer. The number density of spacer particles fixed to a predetermined position of the color filter substrate is 1000 to 20000 / cm ² , The production of a color filter substrate with a spacer according to claim 1, Method.   The spacer according to any one of claims 1 to 10, wherein the spacer is sequentially transferred from the intaglio to the color filter substrate while intermittently feeding out the color filter base plate using a long flexible base material. Method for manufacturing attached color filter substrate.