JP2007322602A - Color filter containing resin-coated pigment and information display panel using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pigment that is superior in dispersibility in a pigment-based ink used for producing a color filter using an ink jet system, to provide the color filter having proper light transmittance and quality and reliability, by optimizing the dispersed state of a color material (pigment) in the color filter manufactured for making the pigment-based ink cured; and to further to provide an information display panel, obtained by using the color filter and superior in color display performance. <P>SOLUTION: At least a color material and a binder resin are incorporated into the color filter, and the color material is a particulate pigment, and the particulate pigment is coated with a resin and then contained in the color filter. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a color filter pigment used as a colorant (colorant) for a color filter for a display device in which ink is arranged on a substrate using an ink jet method, a color filter using the pigment, and the color filter. The present invention relates to the information display panel used.

Conventionally, as a method for producing a color filter, there are a method using a photolithographic method and a method using an inkjet method, which are also applied to the production of a color filter for a liquid crystal display panel.
As a method for manufacturing a color filter, for example, a method using an inkjet method as disclosed in Patent Document 1 has been proposed. In this method, a partition is formed in a matrix shape on a transparent substrate so as to partition a color filter formation region with a material having low wettability with respect to ink, and then a color filter material (ink) is applied using an inkjet method. A color filter is formed by applying in a partition.
Since then, many methods for producing color filters by an application process of an ink-jet color filter material (ink) have been proposed (see, for example, Patent Document 2).

  As a conventional technique for producing a color filter by applying an ink jet method, by using a bifunctional to trifunctional polyfunctional monomer, when ink is sprayed onto a color filter substrate by an ink jet method, the viscosity of the ink at the head tip There has been provided a photocurable ink composition that is less likely to increase, maintains good ejection properties, and is less likely to cause head clogging. Further, there is provided a method for producing a color filter capable of accurately and uniformly forming a cured layer having a predetermined pattern such as a pixel portion (colored layer) using the photocurable ink composition (for example, Patent Document 3). reference).

As another conventional technique for manufacturing a color filter by applying an ink jet method, a curable ink containing a resin component and a colorant that is cured by light irradiation or heat treatment is formed in a black matrix on a transparent substrate. When forming the colored portion 5 by applying and curing by an ink jet method, a method of increasing the interfacial tension of the curable ink and preventing color mixing is provided by previously attaching porous silica particles to the opening. (For example, refer to Patent Document 4).
JP 59-75205 A JP 2003-26966 A Japanese Patent Laid-Open No. 2004-213033 JP 2002-303716 A

  In order to use the pigment used for the color filter as the coloring material of the ink, it is required to stably disperse the pigment in the medium, and a dispersant is generally added to obtain a uniform dispersion system. However, dispersibility that is sufficiently satisfactory cannot be obtained even by a method using this dispersant. For this reason, the color material (pigment) is not preferably dispersed in a color filter made of an ink in which a pigment is dispersed. There was a problem that a color filter having good light transmittance could not be obtained. Examples of the color filter material (ink) include a thermosetting color filter material (ink) and a photocurable color filter material (ink).

  An object of the present invention is to provide a pigment having excellent dispersibility in a pigment-based ink used in manufacturing a color filter by an inkjet method, which solves the above-described problems, and a color produced by curing the pigment-based ink. Providing a color filter (colorant) in the filter with a good dispersion state, providing a color filter with good light transmission, excellent quality and reliability, and color display using a color filter The object is to provide an excellent information display panel.

  The color filter of the present invention is characterized in that it contains at least a color material and a binder resin, the color material is a particulate pigment, and the particulate pigment is resin-coated.

  In the color filter of the present invention, the relationship between the contact angle θ1 between the particulate resin coating resin material smooth surface and water, and the contact angle θ2 between the binder resin material smooth surface contained in the color filter material and water, | Θ1−θ2 | ≦ 20 degrees, the particulate pigment coating resin is the same resin (component) as at least one of the binder resins (components), and the size of the resin-coated pigment is It is in the range of 20 nm to 1 μm, preferably 30 to 200 nm, and is manufactured using an ink jet.

  An information display panel using the color filter of the present invention as a constituent member encloses a display medium in a space partitioned by a partition between at least one transparent substrate, and moves the display medium by an electric field to An information display panel for displaying information, characterized in that color display is performed using color filters of three primary colors (R: red, G: green, B: bluish purple) as constituent members. It is.

  According to the present invention, in a color filter manufactured by an inkjet method in which a color filter material containing at least a color material and a binder resin is cured, the color material is a particulate pigment, and the particulate pigment is resin-coated. By providing a pigment with excellent dispersibility, the dispersion state of the color material (pigment) in the color filter produced by curing this pigment-based ink is made good, and it has good light transmission, A color filter excellent in reliability can be provided, and further, an information display panel excellent in color display using the color filter can be provided.

  First, a basic configuration of a display panel that is an object of the present invention will be described. In the display panel which is an object of the present invention, an electric field is applied to a display medium having optical reflectivity and chargeability sealed between two opposing substrates. In accordance with the applied electric field direction, the charged display medium is attracted by the electric field force or the Coulomb force, and the display medium changes the moving direction according to the change of the electric field direction, thereby displaying information such as an image. Therefore, it is necessary to design the display panel so that the display medium can move uniformly and maintain stability when rewriting the display repeatedly or when displaying the display information continuously. Here, as the force applied to the particles constituting the display medium, in addition to the force attracting each other by the Coulomb force between the particles, an electric mirror image force between the electrode and the substrate, an intermolecular force, a liquid cross-linking force, gravity and the like can be considered.

  An example of a display panel which is an object of the present invention will be described with reference to FIGS. 1 (a) and (b) to FIGS. 3 (a) and 3 (b).

  In the example shown in FIGS. 1A and 1B, at least two types of display media 3 (here, the display white particles 3Wa) having different optical reflectance and charging characteristics composed of at least one type of particles are used. The white display medium 3W composed of the particle group and the black display medium 3B composed of the display black particle 3Ba) are moved perpendicularly to the substrates 1 and 2 according to the electric field applied from the outside of the substrates 1 and 2. The black display medium 3B is visually recognized by the observer and black display is performed, or the white display medium 3W is visually recognized by the observer and white display is performed. In the example shown in FIG. 1B, in addition to the example shown in FIG. 1A, a partition 4 is provided between the substrates 1 and 2, for example, in the form of a lattice to form a cell. In addition, in FIG. 1B, the partition in front is omitted.

  In the example shown in FIGS. 2A and 2B, at least two or more types of display media 3 (here, display white particles 3Wa) having different optical reflectance and charging characteristics composed of at least one type of particles are used. A voltage is applied between the electrode 5 provided on the substrate 1 and the electrode 6 provided on the substrate 2 for the white display medium 3W made of the particle group and the black display medium 3B made of the display black particle 3Ba. Depending on the electric field generated, the substrate is moved perpendicularly to the substrates 1 and 2 so that the black display medium 3B is visually recognized by the observer and black display is performed, or the white display medium 3W is visually recognized by the observer. White display. In the example shown in FIG. 2B, a cell is formed by providing partition walls 4 between the substrates 1 and 2, for example, in a lattice shape. Further, in FIG. 2 (b), the front partition is omitted. The electrode may be provided outside the substrate or may be provided so as to be embedded inside the substrate.

  In the example shown in FIGS. 3A and 3B, the display medium 3 (here, a group of particles of white particles for display 3Wa) having at least an optical reflectance and a charging property composed of at least one kind of particles. The white display medium 3W) is moved in a direction parallel to the substrates 1 and 2 in accordance with the electric field generated by applying a voltage between the electrode 5 and the electrode 6 provided on the substrate 1, and the white display medium is displayed. 3W is visually recognized by the observer and white display is performed, or the color of the electrode 6 or the substrate 1 is visually recognized by the observer and the color of the electrode 6 or the substrate 1 is displayed. In the example shown in FIG. 3B, for example, a lattice-shaped partition wall 4 is provided between the substrates 1 and 2 to form a cell. Moreover, in FIG.3 (b), the partition in front is abbreviate | omitted. The electrode may be provided outside the substrate or may be provided so as to be embedded inside the substrate.

  Next, the resin-coated pigment fine particles to be contained in the color filter of the present invention and an example of the production method thereof will be described.

  FIG. 4 is a cross-sectional view of resin-coated pigment fine particles dispersed in a color filter material. The pigment fine particles 23 are covered with a resin coat 22.

  FIG. 5 is a color filter in which resin-coated pigment fine particles are dispersed. Resin-coated pigment fine particles 23P are dispersed in the binder 24 in the color filter 11. The material of the resin coat 22 covering the pigment fine particles 23 is a resin containing at least the same resin as that of the binder 24, and the resin coat 22 only needs to contain the same resin. Even the resin alone can be mixed with other resins. There may be.

  FIG. 6 shows an apparatus for resin coating fine pigment particles using a spiral air flow. The coating resin in the resin solution layer 31 passes through the conveyance pipe 32 and is sprayed into the container by the resin solution spray nozzle 33. A spiral airflow is generated in the container by the rotor 34 (shown by a dotted line in FIG. 6). The sprayed coating resin coats the pigment fine particles 23 in the container by a spiral air flow.

  FIGS. 7A and 7B are configuration diagrams in which the color filter material of the present invention is arranged on a transparent substrate. FIG. 7A is a cross-sectional view and FIG. 7B is an upper plan view. The substrate 2 provided with the electrodes 6 uses a transparent substrate, and is provided with a black matrix 14 having a function as a bank for preventing the color filter material from spreading outside the arrangement region. A curable ink (color filter materials 11R, 11G, and 11B) is disposed in the opening by an inkjet method.

  Hereinafter, with reference to FIGS. 8 to 15, first to eighth embodiments of the information display panel using the color filter of the present invention will be described. Moreover, in the example shown below, the same code | symbol is attached | subjected to the member same as a previous example, and the description is abbreviate | omitted.

  FIG. 8 shows a first embodiment in which the color filter of the present invention is provided on the substrate with line electrodes of the charged particle in-air driven display panel. A transparent line electrode 6TL is provided on the substrate 2, and a line electrode 5L is provided on the substrate 1.

  FIG. 9 shows a second embodiment in which the color filter of the present invention is provided on the substrate with line electrodes of the charged particle in-air driven display panel. A protective layer 15 is provided on the surface of the color filter opposite to the transparent line electrode 6TL.

  FIG. 10 shows a third embodiment in which the color filter of the present invention is provided on a substrate with individual electrodes of a charged particle in-air driven display panel. A transparent electrode 6T is provided on the substrate 2, and an electrode 5 is provided on the substrate 1.

  FIG. 11 shows a fourth embodiment in which the color filter of the present invention is provided on the substrate with the individual electrodes of the charged particle in-air driven display panel. A protective layer 15 is provided on the surface of the color filter opposite to the transparent electrode 6T.

  FIG. 12 shows a fifth embodiment in which the color filter of the present invention is provided on a substrate with individual electrodes of a display panel driven in a charged particle insulating liquid. An insulating liquid 20 is used as a medium between the substrates.

  FIG. 13 shows a sixth embodiment in which the color filter of the present invention is provided on the substrate with individual electrodes of the charged particle drive type display panel in the insulating liquid in the microcapsule. The microcapsule 30 contains the insulating liquid 20, display white particles 3Wa, and display black particles 3Ba.

  FIG. 14 shows a seventh embodiment in which the color filter of the present invention is provided on an air driven display panel using a combination of a black plate and white charged particles. A black plate 21B and a transparent electrode 5T are provided on the substrate 1 so as to overlap each other. When the display white particles 3Wa are arranged on the transparent electrode side, the color display is performed, and when the display white particles 3Wa are arranged on the electrode 5 side, the display is black.

  FIG. 15 shows an eighth embodiment in which the color filter of the present invention is provided on an air driven display panel using a combination of a white plate and black charged particles. A white plate 21W and a transparent electrode 5T are provided on the substrate 1 so as to overlap each other. When the display black particles 3Ba are arranged on the transparent electrode side, black display is performed, and when the display black particles 3Ba are arranged on the electrode 5 side, color display is performed.

  Next, the resin, binder resin, color material, and ink medium constituting the color filter will be described.

  An example of the resin used for coating the particulate pigment will be described. The resin used for the coating of the particulate pigment to be included in the color filter material includes a contact angle θ1 between the smooth surface of the particulate pigment coating resin material and water, and the binder resin in relation to the binder resin to be included in the color filter material. A resin is selected such that the relationship between the smooth surface of the material and the contact angle θ2 of water is | θ1-θ2 | ≦ 20 degrees.

  For example, acrylic acid / benzyl acrylate copolymer, acrylic acid / methyl acrylate / styrene copolymer, acrylic acid / benzyl acrylate / styrene copolymer, acrylic acid / methyl acrylate / polystyrene macromonomer copolymer, acrylic acid / methyl Acrylate / polymethyl methacrylate macromonomer copolymer, acrylic acid / benzyl acrylate / polystyrene macromonomer copolymer, acrylic acid / benzyl acrylate / polymethyl methacrylate macromonomer copolymer, acrylic acid / 2-hydroxyethyl acrylate / benzyl acrylate / Polystyrene macromonomer copolymer, acrylic acid / 2-hydroxyethyl acrylate / benzyl acrylate / polymethyl methacrylate macromonomer copolymer , Acrylic acid / benzyl methacrylate copolymer, acrylic acid / methyl methacrylate / styrene copolymer, acrylic acid / benzyl methacrylate / styrene copolymer, acrylic acid / methyl methacrylate / polystyrene macromonomer copolymer, acrylic acid / methyl Methacrylate / polymethyl methacrylate macromonomer copolymer, acrylic acid / benzyl methacrylate / polystyrene macromonomer copolymer, acrylic acid / benzyl methacrylate / polymethyl methacrylate macromonomer copolymer, acrylic acid / 2-hydroxyethyl methacrylate / benzyl methacrylate / Polystyrene macromonomer copolymer, acrylic acid / 2-hydroxyethyl methacrylate / benzyl methacrylate / polymethyl methacrylate Acrylic acid copolymers such as macromonomer copolymer, methacrylic acid / benzyl acrylate copolymer, methacrylic acid / methyl acrylate / styrene copolymer, methacrylic acid / benzyl acrylate / styrene copolymer, methacrylic acid / methyl Acrylate / polystyrene macromonomer copolymer, methacrylic acid / methyl acrylate / polymethyl methacrylate macromonomer copolymer, methacrylic acid / benzyl acrylate / polystyrene macromonomer copolymer, methacrylic acid / benzyl acrylate / polymethyl methacrylate macromonomer copolymer Copolymer, methacrylic acid / 2-hydroxyethyl acrylate / benzyl acrylate / polystyrene macromonomer copolymer, methacrylic acid / 2-hydroxyethyl acrylate / ben Zyl acrylate / polymethyl methacrylate macromonomer copolymer, methacrylic acid / benzyl methacrylate copolymer, methacrylic acid / methyl methacrylate / styrene copolymer, methacrylic acid / benzyl methacrylate / styrene copolymer, methacrylic acid / methyl methacrylate / polystyrene Macromonomer copolymer, methacrylic acid / methyl methacrylate / polymethyl methacrylate macromonomer copolymer, methacrylic acid / benzyl methacrylate / polystyrene macromonomer copolymer, methacrylic acid / benzyl methacrylate / polymethyl methacrylate macromonomer copolymer, methacryl Acid / 2-hydroxyethyl methacrylate / benzyl methacrylate / polystyrene macromonomer copolymer, methacrylic acid / 2- Mention may be made of mud methacrylate / benzyl methacrylate / polymethyl methacrylate macromonomer copolymers methacrylic acid copolymers such as such.

  Furthermore, styrene acrylic resin, acrylic resin, acrylic urethane resin, acrylic urethane silicone resin, acrylic urethane fluororesin, acrylic fluororesin, acrylic silicone resin, polyolefin resin, butyral resin, vinylidene chloride resin, melamine resin, phenol resin, fluororesin, Examples of the resin include polycarbonate resin, polysulfone resin, polyether resin, urethane resin, urea resin, polyester resin, silicone resin, epoxy resin, polystyrene resin, polyamide resin, and the like. These resins can also be mixed.

  In particular, from the viewpoint of controlling the adhesive force with the binder resin (component) contained in the color filter material, it is preferable to coat the particulate pigment with the same resin as one of the binder resins (components) contained in the color filter material.

  The binder resin contained in the color filter of the present invention will be described. What added the hardening | curing agent is used for the binder resin contained in a color filter material. As the binder contained in the thermosetting color filter material, a combination of a known resin and a crosslinking agent can be used. Specifically, a melamine resin, a hydroxyl group or a carboxyl group-containing polymer and a melamine, a hydroxyl group or a carboxyl group-containing polymer Functional epoxy compounds, hydroxyl group or carboxyl group-containing polymers and fibrin reactive compounds, epoxy resins and resol resins, epoxy resins and amines, epoxy resins and carboxylic acids or acid anhydrides, epoxy compounds, natural resins, or acrylic resins Polyester resins, polyurethane resins, polyvinyl resins, amino resins, epoxy resins, polyether resins, etc. are used, and acrylic resins are particularly preferably used. 0.1 to 20 weight %, Preferably in the range of 0.2 to 15% by weight.

In addition, as a binder contained in the photocurable color filter material, there is an ultraviolet (UV) curable binder, which is mainly composed of a prepolymer, a monomer, a photoinitiator, and a coloring material. Become a binder.
As the prepolymer, any of prepolymers such as polyester acrylate, polyurethane acrylate, epoxy acrylate, polyether acrylate, oligo acrylate, alkyd acrylate, polyol acrylate, and silicon acrylate can be used without any particular limitation.
Monomers include vinyl monomers such as styrene and vinyl acetate; monofunctional acrylic monomers such as n-hexyl acrylate and phenoxyethyl acrylate; diethylene glycol diacrylate, 1,6-hexanediol diacrylate, hydroxypiperic acid ester neopentyl glycol diacrylate , Polyfunctional acrylic monomers such as trimethylolpropane triacrylate, dipentaerystol hexaacrylate, acrylic acid, methacrylic acid, methyl acrylate, methyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, benzyl acrylate, benzyl methacrylate, Use styrene, polystyrene macromonomer, polymethylmethacrylate macromonomer, etc. It can be.
The prepolymer and the monomer may be used alone or in combination of two or more.

Photopolymerization initiators are isobutyl benzoin ether, isopropyl benzoin ether, benzoin ethyl ether, benzoin methyl ether, 1-phenyl-1,2-propadion-2-oxime, 2,2-dimethoxy-2-phenylacetophenone, benzyl, hydroxy Cyclohexyl phenyl ketone, diethoxyacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, benzophenone, chlorothioxanthone, 2-chlorothioxanthone, isopropylthioxanthone, 2-methylthioxanthone, chlorine-substituted benzophenone, halogen-substituted alkyl -From allyl ketone etc., what can obtain desired curability can be selected and used.
In addition, photoinitiators such as aliphatic amines and aromatic amines; and photosensitizers such as thioxanthone may be added as necessary.

  As the binder resin (component) to be included in the color filter material, the contact angle θ1 between the smooth surface of the particulate pigment coating resin material and water in relation to the resin used for coating the particulate pigment to be included in the color filter material, and The resin is selected such that the relationship between the contact surface θ2 between the smooth surface of the binder resin material and water is | θ1-θ2 | ≦ 20 degrees. It is preferable to add the same resin as that used for the coating of the particulate pigment to the color filter material as one of the binder resins (components), since the contact angle relationship is formed.

The color material contained in the color filter of the present invention will be described. A pigment is used as the color material, and the pigment is an inorganic pigment or an organic pigment, and is not particularly limited.
Examples of organic pigments include azo pigments such as azo lakes, insoluble azo pigments, condensed azo pigments, chelate azo pigments, phthalocyanine pigments, perylene pigments, perinone pigments, anthraquinone pigments, quinacridone pigments, dioxazine pigments, thioindigo pigments, isoindolinone pigments, Examples thereof include polycyclic pigments such as quinophthalone pigments, and dye lakes.
Examples of the inorganic pigment include oxides such as titanium oxide, bengara, chromium oxide, and iron black, cadmium yellow, chromium vermilion, bitumen, ultramarine blue, and yellow iron oxide.

Among these, organic pigments are preferably used because they have high color developability and high heat resistance. Preferred organic pigments include, for example, compounds classified as Pigment in the Color Index (CI; issued by The Society of Dyers and Colorists), specifically, the following Color Index (C.I. I.) Numbers can be mentioned.
C. I. Pigment yellow 1, C.I. I. Pigment yellow 3, C.I. I. Pigment yellow 12, C.I. I. Pigment yellow 13, C.I. I. Pigment yellow 14, C.I. I. Pigment yellow 15, C.I. I. Pigment yellow 16, C.I. I. Pigment yellow 17, C.I. I. Pigment yellow 20, C.I. I. Pigment yellow 24, C.I. I. Pigment yellow 31, C.I. I. Pigment yellow 55, C.I. I. Pigment yellow 60, C.I. I. Pigment yellow 61, C.I. I. Pigment yellow 65, C.I. I. Pigment yellow 71, C.I. I. Pigment yellow 73, C.I. I. Pigment yellow 74, C.I. I. Pigment yellow 81, C.I. I. Pigment yellow 83, C.I. I. Pigment yellow 93, C.I. I. Pigment yellow 95, C.I. I. Pigment yellow 97, C.I. I. Pigment yellow 98, C.I. I. Pigment yellow 100, C.I. I. Pigment yellow 101, C.I. I. Pigment yellow 104, C.I. I. Pigment yellow 106, C.I. I. Pigment yellow 108, C.I. I. Pigment yellow 109, C.I. I. Pigment yellow 110, C.I. I. Pigment yellow 113, C.I. I. Pigment yellow 114, C.I. I. Pigment yellow 116, C.I. I. Pigment yellow 117, C.I. I. Pigment yellow 119, C.I. I. Pigment yellow 120, C.I. I. Pigment yellow 126, C.I. I. Pigment yellow 127, C.I. I. Pigment yellow 128, C.I. I. Pigment yellow 129, C.I. I. Pigment yellow 138, C.I. I. Pigment yellow 139, C.I. I. Pigment yellow 150, C.I. I. Pigment yellow 151, C.I. I. Pigment yellow 152, C.I. I. Pigment yellow 153, C.I. I. Pigment yellow 154, C.I. I. Pigment yellow 155, C.I. I. Pigment yellow 156, C.I. I. Pigment yellow 166, C.I. I. Pigment yellow 168, C.I. I. Pigment yellow 175; C.I. I. Pigment orange 1, C.I. I. Pigment orange 5, C.I. I. Pigment orange 13, C.I. I. Pigment orange 14, C.I. I. Pigment orange 16, C.I. I. Pigment orange 17, C.I. I. Pigment orange 24, C.I. I. Pigment orange 34, C.I. I. Pigment orange 36, C.I. I. Pigment orange 38, C.I. I. Pigment orange 40, C.I. I. Pigment orange 43, C.I. I. Pigment orange 46, C.I. I. Pigment orange 49, C.I. I. Pigment orange 51, C.I. I. Pigment orange 61, C.I. I. Pigment orange 63, C.I. I. Pigment orange 64, C.I. I. Pigment orange 71, C.I. I. Pigment orange 73; C.I. I. Pigment violet 1, C.I. I. Pigment violet 19, C.I. I. Pigment violet 23, C.I. I. Pigment violet 29, C.I. I. Pigment violet 32, C.I. I. Pigment violet 36, C.I. I. Pigment violet 38; C.I. I. Pigment red 1, C.I. I. Pigment red 2, C.I. I. Pigment red 3, C.I. I. Pigment red 4, C.I. I. Pigment red 5, C.I. I. Pigment red 6, C.I. I. Pigment red 7, C.I. I. Pigment red 8, C.I. I. Pigment red 9, C.I. I. Pigment red 10, C.I. I. Pigment red 11, C.I. I. Pigment red 12, C.I. I. Pigment red 14, C.I. I. Pigment red 15, C.I. I. Pigment red 16, C.I. I. Pigment red 17, C.I. I. Pigment red 18, C.I. I. Pigment red 19, C.I. I. Pigment red 21, C.I. I. Pigment red 22, C.I. I. Pigment red 23, C.I. I. Pigment red 30, C.I. I. Pigment red 31, C.I. I. Pigment red 32, C.I. I. Pigment red 37, C.I. I. Pigment red 38, C.I. I. Pigment red 40, C.I. I. Pigment red 41, C.I. I. Pigment red 42, C.I. I. Pigment red 48: 1, C.I. I. Pigment red 48: 2, C.I. I. Pigment red 48: 3, C.I. I. Pigment red 48: 4, C.I. I. Pigment red 49: 1, C.I. I. Pigment red 49: 2, C.I. I. Pigment red 50: 1, C.I. I. Pigment red 52: 1, C.I. I. Pigment red 53: 1, C.I. I. Pigment red 57, C.I. I. Pigment red 57: 1, C.I. I. Pigment red 57: 2, C.I. I. Pigment red 58: 2, C.I. I. Pigment red 58: 4, C.I. I. Pigment red 60: 1, C.I. I. Pigment red 63: 1, C.I. I. Pigment red 63: 2, C.I. I. Pigment red 64: 1, C.I. I. Pigment red 81: 1, C.I. I. Pigment red 83, C.I. I. Pigment red 88, C.I. I. Pigment red 90: 1, C.I. I. Pigment red 97, C.I. I. Pigment red 101, C.I. I. Pigment red 102, C.I. I. Pigment red 104, C.I. I. Pigment red 105, C.I. I. Pigment red 106, C.I. I. Pigment red 108, C.I. I. Pigment red 112, C.I. I. Pigment red 113, C.I. I. Pigment red 114, C.I. I. Pigment red 122, C.I. I. Pigment red 123, C.I. I. Pigment red 144, C.I. I. Pigment red 146, C.I. I. Pigment red 149, C.I. I. Pigment red 150, C.I. I. Pigment red 151, C.I. I. Pigment red 166, C.I. I. Pigment red 168, C.I. I. Pigment red 170, C.I. I. Pigment red 171, C.I. I. Pigment red 172, C.I. I. Pigment red 174, C.I. I. Pigment red 175, C.I. I. Pigment red 176, C.I. I. Pigment red 177, C.I. I. Pigment red 178, C.I. I. Pigment red 179, C.I. I. Pigment red 180, C.I. I. Pigment red 185, C.I. I. Pigment red 187, C.I. I. Pigment red 188, C.I. I. Pigment red 190, C.I. I. Pigment red 193, C.I. I. Pigment red 194, C.I. I. Pigment red 202, C.I. I. Pigment red 206, C.I. I. Pigment red 207, C.I. I. Pigment red 208, C.I. I. Pigment red 209, C.I. I. Pigment red 215, C.I. I. Pigment red 216, C.I. I. Pigment red 220, C.I. I. Pigment red 224, C.I. I. Pigment red 226, C.I. I. Pigment red 242, C.I. I. Pigment red 243, C.I. I. Pigment red 245, C.I. I. Pigment red 254, C.I. I. Pigment red 255, C.I. I. Pigment red 264, C.I. I. Pigment red 265; C.I. I. Pigment blue 15, C.I. I. Pigment blue 15: 3, C.I. I. Pigment blue 15: 4, C.I. I. Pigment blue 15: 6, C.I. I. Pigment blue 60; I. Pigment green 7, C.I. I. Pigment green 36; C.I. I. Pigment brown 23, C.I. I. Pigment brown 25; C.I. I. Pigment Black 1 and Pigment Black 7.
In particular, C.I. I. Pigment red 177, 254, C.I. I. Pigment red 5, C.I. I. Pigment red 12, C.I. I. Pigment green 36, 7, C.I. I. Pigment blue 209, 15: 6, C.I. I. Pigment blue 16, C.I. I. Pigment Yellow 138, 150 and the like are preferably used.

Furthermore, the following are mentioned according to the classification of the pigment.
Examples of black pigments include carbon black, copper oxide, manganese dioxide, aniline black, and activated carbon. Yellow pigments include yellow lead, zinc yellow, cadmium yellow, yellow iron oxide, mineral first yellow, nickel titanium yellow, navel yellow, naphthol yellow S, Hansa yellow G, Hansa yellow 10G, benzidine yellow G, benzidine yellow GR, quinoline There are yellow rake, permanent yellow NCG, tartrage rake and so on.
Examples of the orange pigment include red yellow lead, molybdenum orange, permanent orange GTR, pyrazolone orange, Vulcan orange, indanthrene brilliant orange RK, benzidine orange G, indanthrene brilliant orange GK and the like.
Examples of red pigments include bengara, cadmium red, red lead, mercury sulfide, cadmium, permanent red 4R, risor red, pyrazolone red, watching red, calcium salt, lake red D, brilliant carmine 6B, eosin lake, rhodamine lake B, There are Alizarin Lake and Brilliant Carmine 3B.
Examples of purple pigments include manganese purple, first violet B, and methyl violet lake. Examples of blue pigments include bitumen, cobalt blue, alkali blue lake, Victoria blue lake, phthalocyanine blue, metal-free phthalocyanine blue, phthalocyanine blue partially chlorinated, first sky blue, and indanthrene blue BC.
Examples of green pigments include chrome green, chromium oxide, pigment green B, malachite green lake, final yellow green G, and the like.
Examples of extender pigments include barite powder, barium carbonate, clay, silica, white carbon, talc, and alumina white. These color materials can be used alone or in combination.

When the color filter material is an ink applied to the ink jet method and the ink is an aqueous ink, the aqueous medium in the ink is a mixed solvent of water and a water-soluble organic solvent, and the water-soluble organic solvent is an ink drying method. It is desirable to use water having a preventive effect, and to use deionized water rather than general water containing various ions.
Specific examples of the water-soluble organic solvent include alkyls having 1 to 5 carbon atoms such as methanol, ethanol, n-propanol, isopropanol, n-butanol, sec-butanol, tert-butanol, isobutanol, and n-pentanol. Alcohols; Amides such as dimethylformamide and dimethylacetamide; Ketones or ketoalcohols such as acetone and diacetone alcohol; Ethers such as tetrahydrofuran and dioxane; Diethylene glycol, triethylene glycol, tetraethylene glycol, dipropylene glycol, and tripropylene Oxyethylene or oxypropylene copolymers such as glycol, polyethylene glycol, polypropylene glycol; ethylene glycol, propylene glycol, trimethylene glycol Alkylene glycols wherein the alkylene group contains 2 to 6 carbon atoms, such as triethylene glycol, 1,2,6-hexanetriol; glycerin; ethylene glycol monomethyl (or ethyl) ether, diethylene glycol monomethyl (or ethyl) ether, Lower alkyl ethers such as triethylene glycol monomethyl (or ethyl) ether; lower dialkyl ethers of polyhydric alcohols such as triethylene glycol dimethyl (or ethyl) ether and tetraethylene glycol dimethyl (or ethyl) ether; monoethanolamine; Alkanolamines such as diethanolamine and triethanolamine; sulfolane, N-methyl-2-pyrrolidone, 2-pyrrolidone, 1,3-dimethyl-2-imidazolidinone, etc. Can be mentioned. These water-soluble organic solvents can be used alone or as a mixture.

In addition to the above-described components, surfactants, antifoaming agents, preservatives, fungicides, and the like can be added as necessary, and commercially available water-soluble dyes can also be added. Specifically, anionic surfactants such as fatty acid salts, higher alcohol sulfates, liquid fatty oil sulfates, alkylallylsulfonates, polyoxyethylene alkyl ethers, polyoxyethylene alkyl esters, polyoxy Nonionic surfactants such as ethylene sorbitan alkyl esters, acetylene alcohol, acetylene glycol and the like can be mentioned, and these can be used alone or in combination.
As a color filter material (ink) composed mainly of a monomer, a material having a viscosity that can be ejected by inkjet is selected and used without using a solvent.

An example of a method for manufacturing an information display panel using the color filter of the present invention will be described. First, a line-shaped transparent ITO electrode is provided on one surface of a transparent substrate on the display side. At this time, it is preferable to provide alignment marks at the four corners of the substrate simultaneously with the formation of the transparent ITO electrode. Next, corresponding to each ITO electrode, a red filter (R), a green filter (G), and a blue filter (B) are formed on the surface of the substrate opposite to the surface on which the ITO electrode and the alignment mark are provided. A color filter composed of repetition is formed by an inkjet method.
In the above-described example, the color filter including the red filter (R), the green filter (G), and the blue filter (B) is used as an example of the color filter. However, the present invention is not limited to this. A color filter composed of a set of colors such as cyan, magenta, and yellow can also be used. Moreover, although the ITO electrode was provided as an electrode, another material can be used if it is transparent and has electroconductivity.

  Hereinafter, each member which comprises the information display panel used as the object of this invention is demonstrated.

Regarding the substrate, at least one of the substrates is a transparent substrate from which the color of the display medium can be confirmed from the outside of the panel, and the color filter material of the present invention is disposed on this transparent substrate. As this transparent substrate, a material having high visible light transmittance and good heat resistance is suitable. The substrate on the side where the color filter material is not disposed may be transparent or opaque.
Examples of substrate materials include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyethersulfone (PES), polyethylene (PE), polycarbonate (PC), polyimide (PI), polymer sheets such as acrylic resin, Examples thereof include a flexible sheet such as a metal sheet and a non-flexible inorganic sheet such as glass and quartz. The thickness of the substrate is preferably from 2 to 5000 μm, more preferably from 5 to 2000 μm. If it is too thin, it will be difficult to maintain the strength and the spacing uniformity between the substrates. Is inconvenient.

  Electrode forming materials include metals such as aluminum, silver, nickel, copper, gold, and conductive materials such as indium tin oxide (ITO), indium oxide, antimony tin oxide (ATO), conductive tin oxide, and conductive zinc oxide. Examples thereof include conductive polymers such as metal oxides, polyaniline, polypyrrole, and polythiophene, which are appropriately selected and used. The electrode can be formed by patterning the above-described materials into a thin film by sputtering, vacuum deposition, CVD (chemical vapor deposition), coating, or the like, or by mixing a conductive agent with a solvent or synthetic resin binder. A method of applying and patterning is used. The electrode provided on the viewing side (display surface side) substrate needs to be transparent, but the electrode provided on the back side substrate does not need to be transparent. In any case, the above-mentioned material that is conductive and capable of pattern formation can be suitably used. Note that the electrode thickness is not particularly limited as long as the conductivity can be secured and the light transmittance is not hindered, and is preferably 3 to 1000 nm, preferably 5 to 400 nm. The material and thickness of the electrode provided on the back side substrate are the same as those of the electrode provided on the display surface side substrate described above, but need not be transparent. In this case, the external voltage input may be superimposed with direct current or alternating current.

  The planar shape of the opening may be any of a circle, an ellipse, a square, and a stripe. However, when the color filter material is used as an ink used in the ink jet method, the surface tension of the ink is taken into consideration, such as a rectangle. In some cases, it is preferable to round the corners.

A photosensitive resin light-shielding layer is provided on the transparent glass substrate on which the predetermined ITO electrode is formed on the substrate surface opposite to the surface on which the ITO electrode is formed, and the photosensitive resin light-shielding layer is provided with a matrix-shaped opening. The bank (black matrix) having patterning was formed by well-known lithography.
Next, the matrix-shaped openings divided by the black matrix are combined with a red color filter material (R), a green color filter material (G), and a blue color filter material (B) in three adjacent openings. As described above, each color filter material is arranged by an inkjet method.
The particulate pigments constituting the three color filter materials include C.I. I. Pigment red 177 (R: red), C.I. I. Pigment green 36 (G: green), C.I. I. Pigment Blue 15: 6 (B: Blue) is prepared, and a particulate pigment of each color is coated with a styrene-acrylic resin using a spira flow apparatus (manufactured by Freund Corporation) as a color material. Then, the color filter material (ink) having the following configuration was adjusted, and each color filter material was arranged by an ink jet method.
In the ink jet method, since it is preferable to control the size of the ink droplets according to the size of the color filter layer forming region that is the target, in the embodiment of the present invention, 6 to The color filter material was arranged by forming ink droplets controlled to 30 picoliters, and a color filter was formed.

<Experimental example 1>
Experimental Example 1 is an example in which a resin-coated pigment is used as a coloring material for water-based thermosetting ink. A particulate pigment coated with a styrene-acrylic resin as a binder at an ink composition ratio shown in Table 1 was added.

  As shown in Table 2, the blended ink was replaced with a resin material coated with a particulate pigment and placed on a substrate by an ink jet method, followed by a thermosetting treatment to produce a color filter.

When the produced color filter was observed with an optical microscope, it was found that in Examples 1 and 2, there was no color unevenness over the entire surface, and the dispersion state of the colorant was good.
In Comparative Example 2 in which the particulate pigment was used without being coated with resin, and in Comparative Example 1 in which the difference between the contact angle between the coating resin and water and the contact angle between the binder resin and water exceeded 20 degrees, Unevenness was seen, and it was found that the color material was in a poorly dispersed state.

<Experimental example 2>
Experimental Example 2 is an example in which a resin-coated pigment is used as a color material for photocurable ink. A particulate pigment resin-coated on an acrylic monomer as a binder at an ink composition ratio shown in Table 3 was added.

  As shown in Table 4, the blended ink was replaced with a resin material coated with a particulate pigment, and placed on a substrate by an ink jet method, followed by ultraviolet (UV) curing treatment to produce a color filter.

When the produced color filter was observed with an optical microscope, it was found that in Examples 3 and 4, there was no color unevenness over the entire surface, and the dispersion state of the coloring material was good.
In Comparative Example 4 in which the particulate pigment was used without being coated with resin, and in Comparative Example 3 in which the difference between the contact angle between the coating resin and water and the contact angle between the binder resin and water exceeded 20 degrees, the color Unevenness was seen, and it was found that the color material was in a poorly dispersed state.

  As described above, when the particulate pigment is resin-coated, and the difference between the contact angle between the coating resin and water and the contact angle between the binder resin and water is 20 degrees or less, the color filter has uneven color over the front surface. In other words, it was found that the dispersed state of the coloring material was good.

  An information display panel according to the present invention includes a notebook computer, an electronic notebook, a portable information device called PDA (Personal Digital Assistants), a display unit of a mobile device such as a mobile phone and a handy terminal, an electronic book such as an electronic book and an electronic newspaper. Paper, signboards, posters, bulletin boards such as blackboards (whiteboards), electronic desk calculators, home appliances, automotive display units, point cards, IC card display units, electronic advertisements, information boards, electronic POPs (Points) Of presence, point of purchase advertising), electronic price tag, electronic shelf label, electronic musical score, display part of RF-ID equipment, as well as display part of various electronic equipment such as POS terminal, car navigation device, clock, etc. .

  The information display panel driving method according to the present invention includes a simple matrix driving display panel, a static driving display panel that does not use a switching element in the panel itself, and three thin film transistors (TFTs). Various types of information display panels such as an active matrix drive type display panel using a two-terminal switching element represented by a terminal switching element or a thin film diode (TFD) can be used.

(A), (b) is a figure which shows an example of the panel for information displays used as the object of this invention, respectively. (A), (b) is a figure which shows the other example of the information display panel used as the object of this invention, respectively. (A), (b) is a figure which shows the further another example of the information display panel used as the object of this invention, respectively. FIG. 3 is a cross-sectional view of resin-coated pigment fine particles dispersed in a color filter material. This is a color filter in which pigment fine particles coated with resin are dispersed. 1 shows an apparatus for resin coating fine pigment particles using a spiral air flow. It is the block diagram which has arrange | positioned the color filter material of this invention on the transparent substrate, (a) is sectional drawing, (b) shows a top plan view. 1 shows a first embodiment of an information display panel using a color filter of the present invention. 2 shows a second embodiment of an information display panel using the color filter of the present invention. 3 shows a third embodiment of an information display panel using the color filter of the present invention. 4 shows a fourth embodiment of an information display panel using the color filter of the present invention. 7 shows a fifth embodiment of an information display panel using the color filter of the present invention. 6 shows a sixth embodiment of an information display panel using the color filter of the present invention. 7 shows a fifth embodiment of an information display panel using the color filter of the present invention. 6 shows a sixth embodiment of an information display panel using the color filter of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 2 Substrate 3 Display medium 3W White display medium 3Wa Display white particle 3B Black display medium 3Ba Display black particle 4 Partition 5, 6 Electrode 5L Line electrode 5T, 6T Transparent electrode 6TL Transparent line electrode 11 Color filter 11R Red color filter 11G Green color filter 11B Blue color filter 13 Colored particles for display 14 Bank (black matrix)
DESCRIPTION OF SYMBOLS 15 Protective layer 20 Insulating liquid 21W White board 21B Black board 22 Resin coating 23 Pigment particulate 23P Resin coated pigment particulate 24 Binder 30 Microcapsule 31 Resin solution layer 32 Conveying piping 33 Resin solution spray nozzle 34 Rotor

Claims (7)

  A color filter obtained by curing a color filter material containing at least a color material and a binder resin, wherein the color material is a particulate pigment and the particulate pigment is resin-coated.   The relationship between the contact angle θ1 between the smooth surface of the particulate pigment coating resin material and water and the contact angle θ2 between the smooth surface of the binder resin material contained in the color filter material and water is | θ1−θ2 | ≦ 20. 2. The color filter according to claim 1, wherein a resin having a certain degree is used for the coating resin and binder resin (component) of the particulate pigment.   The color filter according to claim 1, wherein the particulate pigment coating resin is the same resin (component) as at least one binder resin (component) contained in the color filter material.   The color filter according to any one of claims 1 to 3, wherein the size of the particulate pigment coated with the coating resin is in the range of 20 nm to 1 µm.   The color filter according to claim 1, wherein the color filter is manufactured using an inkjet.   An information display panel comprising the color filter according to claim 1 as a constituent member.   6. The information display panel according to claim 5, wherein a display medium is sealed in a space partitioned by a partition between at least one transparent substrate, and information such as an image is displayed by moving the display medium by an electric field. An information display panel, characterized in that color display is performed using color filters of three primary colors (R: red, G: green, B: bluish purple) as constituent members.

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