JP5002197B2 - Color filter and information display panel - Google Patents

Description

  The present invention relates to a color filter ink, a color filter for a display medium drive type display panel manufactured by arranging ink on a substrate using an inkjet method, and an information display panel using the color filter.

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 applying the ink jet method of the color filter manufacturing method, for example, a 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 using an ink-jet color filter material (ink) coating process have been proposed and applied to the production of color filters for liquid crystal display panels (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 Japanese Patent Laid-Open No. 2003-026966 Japanese Patent Laid-Open No. 2004-213033 JP 2002-303716 A

  However, when this color filter for a liquid crystal display panel is used for a display medium moving type information display panel composed of particles, in other words, even if there is no problem in the initial display state, as the number of display rewrites increases, in other words As the number of movements of the display medium increases, there is a problem that the display medium (particles) adheres to the color filter and does not move and the display performance deteriorates. As the color filter material (ink), there are a thermosetting color filter material (ink) and a photo-curable color filter material (ink).

  The object of the present invention is to solve the above-mentioned problems and provide a color filter excellent in display quality and display reliability that can be applied to a display medium moving display panel in a color filter manufactured by an ink jet method. An object of the present invention is to provide an information display panel using a filter and having excellent color display properties.

  The color filter of the present invention is a color filter composed of a color filter material containing at least a color material and a binder resin, and has a surface roughness in the range of 20 nm to 1000 nm. is there.

  The color filter of the present invention is a color filter composed of a color filter material containing at least a color material, a binder resin, and fine particles for surface roughness adjustment, and the surface roughness is in the range of 20 nm to 1000 nm. It is characterized by being.

  The color filter of the present invention includes a thermosetting resin or a photocurable resin, and is manufactured using an inkjet.

  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 the color filter manufactured by the ink jet method, the color filter material contains at least a color material and a binder resin, and the surface roughness is in the range of 20 nm to 1000 nm. In addition to providing a color filter excellent in display quality and display reliability that can be applied to a mold-type display panel, an information display panel excellent in color display using a 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. 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. 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, an example in which the color filter of the present invention is provided will be described. FIG. 4 is a configuration diagram in which the color filter of the present invention is provided on a substrate with line electrodes. A line electrode 6L is provided on the substrate 2, and a color filter 11 (red color filter: 11R, green color filter: 11G, blue-purple color filter: 11B) is formed thereon. A color filter is desired by adding fine particles having a particle diameter of 20 nm to 1000 nm for adjusting the surface roughness to the ink constituting the color filter, or by subjecting the surface of the produced color filter to polishing such as sandblasting. Surface roughness. The surface of the substrate 1 that is not provided with the color filter and is in contact with the display medium is adjusted to a desired surface roughness after forming the line electrode 5L, or the color material is changed as shown in FIG. 4 after forming the line electrode 5L. The color filter 11 is arranged and adjusted to a desired surface roughness.

  FIG. 5 is a configuration diagram in which individual electrodes are provided on the color filter of the present invention. The color filters 11R, 11G, and 11B have desired irregularities, and when the electrode 6 is provided thereon, the thickness of the electrode is very thin, so the surface roughness of the color filter layer is directly reflected in the electrode surface roughness. The electrode 6 has irregularities. The surface of the substrate 1 that is not provided with the color filter and is in contact with the display medium is adjusted to a desired surface roughness before forming the electrode 5, or a color filter 11 with a different color material is disposed as shown in FIG. After adjusting the surface roughness to a desired level, the electrode 5 is provided so that the contact surface with the display medium has irregularities.

  FIGS. 6A and 6B are configuration diagrams in which the color filter material of the present invention is disposed on a transparent substrate, FIG. 6A is a cross-sectional view, and FIG. 6B 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, as an example of a method for producing a color filter, a method for polishing the color filter and a method for incorporating fine particles into the color filter will be described.

  After curing the color filter material (ink) arranged by the ink jet method, the surface is sandblasted to finish the desired surface roughness. The desired surface roughness is obtained by adjusting the size of the abrasive fine particles used for sandblasting. As the fine particles for polishing, inorganic fine particles such as sand and organic fine particles such as walnut powder and resin powder can be used.

A color filter material (ink) blended with surface roughness adjusting fine particles is placed by an ink jet method and cured to obtain a surface roughness reflecting the particle diameter of the blended surface roughness adjusting fine particles. In order to improve the dispersibility in the binder resin in the ink, it is preferable to use the fine particles for adjusting the surface roughness to be blended in advance with the same component resin as the binder resin.
As a method for coating the surface roughness adjusting fine particles with a resin, there is a method in which a solution in which the resin to be coated is dissolved in water or an organic solvent is sprayed onto the particulate pigment. Specifically, first, the coating resin is dissolved in water or an organic solvent. Here, as a solvent for dissolving the resin, it is natural to use a solvent capable of dissolving the coating resin. However, a solvent having a high boiling point is not preferable because it undergoes a drying process at the time of manufacture. Methanol, ethanol, acetone, 2- Butanone or the like is preferably used. The resin solution thus prepared is sprayed on the surface roughness adjusting fine particles. The spraying is preferably performed by a method of spraying the surface roughness adjusting fine particles placed in the processing container under a reduced pressure by a spray having an appropriate nozzle diameter, but is not limited to this method. The temperature in the processing container needs to be set to a temperature sufficiently higher than the boiling point so that water or the organic solvent is immediately dried. If the set temperature is too low, the surface roughness adjusting fine particles adhere and aggregate in a state where the temperature is not sufficiently dried, and the resin coated surface roughness adjusting fine particles having a primary particle diameter cannot be obtained. In order to prevent the particles from adhering to each other and aggregating, it is preferable to carry out by a method of spraying a resin to be coated while vigorously stirring the particles. As a method of stirring the particles, a means of inserting a stirring blade in the lower part of the processing vessel and rotating the stirring blade can be considered, but the bottom surface of the processing vessel is made into a wire mesh of about # 40 mesh, and then compressed into the processing vessel at a high temperature. Use of a means for introducing air is preferable because the particles can be stirred more vigorously and the drying speed can be increased. Examples of such an apparatus include Spira Flow (manufactured by Freund Corporation) and Agromaster (manufactured by Hosokawa Micron Corporation).

As the resin used for coating the fine particles for adjusting the surface roughness, the same resin as the binder resin contained in the color filter material or a resin having the same main component is selected.
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, coat the surface roughness adjusting fine particles with the same resin as one of the binder resins (components) contained in the color filter material. Is preferred.
The amount of the resin coated on the surface roughness adjusting fine particles is 0.01 to 30% by weight, preferably 0.05 to 20% by weight, more preferably 0.1 to 0.1% by weight based on the surface roughness adjusting fine particles. 10% by weight is preferred.
When the resin coating amount is less than 0.01% by weight, it cannot be uniformly dispersed when dispersed in the color filter material. When the resin coating amount exceeds 30% by weight, the coated fine particles for adjusting the surface roughness are aggregated. When the dispersion is contained in the color filter material, it cannot be uniformly dispersed.

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

What added the hardening | curing agent is used for the binder resin contained in a color filter material (ink).
As the binder contained in the thermosetting ink, a combination of a known resin and a crosslinking agent can be used. Specifically, a melamine resin, a hydroxyl group or carboxyl group-containing polymer and a melamine, a hydroxyl group or carboxyl group-containing polymer and a polyfunctional epoxy are used. Compound, hydroxyl group or carboxyl group-containing polymer and fibrin reactive compound, epoxy resin and resol resin, epoxy resin and amines, epoxy resin and carboxylic acid or acid anhydride, epoxy compound, natural resin, acrylic resin, polyester Resin, polyurethane resin, polyvinyl resin, amino resin, epoxy resin, polyether resin, etc. are used, especially acrylic resin, and this binder resin is the total weight of the color filter material (ink). 0.1 to 20% by weight based on , Preferably in the range of 0.2 to 15% by weight.
In addition, as the photocurable ink, there is an ultraviolet (UV) curable ink, which mainly includes a prepolymer, a monomer, a photoinitiator, and a coloring material, and the prepolymer, the monomer, and the like serve as 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.

Any one of organic colorants and inorganic colorants can be selected and used in accordance with a desired color such as R, G, and B. As the organic colorant, for example, dyes, organic pigments, natural pigments, and the like can be used. Moreover, as an inorganic coloring agent, an inorganic pigment, an extender pigment, etc. can be used, for example. As the colorant, either a dye or a pigment can be preferably used.
For example, as the dye, C.I. I. Acid Red 118, C.I. I. Acid Red 254, C.I. I. Acid Green 25, C.I. I. Acid Blue 113, C.I. I. Acid Blue 185, C.I. I. Acid Blue 7 and pigments include C.I. I. Pigment red 177, C.I. I. Pigment red 5, C.I. I. Pigment red 12, C.I. I. Pigment green 36, C.I. I. Pigment blue 209, C.I. I. Pigment blue 16 and the like, but are not limited thereto.
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; C.I. 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, and indanthrene brilliant orange GK.
Examples of red pigments include bengara, cadmium red, red lead, mercury sulfide, cadmium, permanent red 4R, risol 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 induslen blue BC.
Examples of the green pigment 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 (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 has an effect of preventing the ink from drying. In addition, it is desirable to use deionized water instead of 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 components described above, a surfactant, an antifoaming agent, an antiseptic, an antifungal agent and the like can be added as necessary, and a commercially available water-soluble dye and the like 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.

As an example of forming a color filter on an electrode, first, a line-like 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, a red filter (R), a green filter (G), and a blue-purple filter (B) are repeated on the ITO electrode and the electrode on the side where the alignment mark is provided, corresponding to each ITO electrode. The color filter comprised from this is formed by the inkjet method.

As an example of forming an electrode on a color filter, first, a red filter (R), a green filter (G), and a blue-purple filter (B) are repeatedly formed on one surface of a transparent substrate on the display side. A color filter to be formed is formed by an ink jet method. At this time, it is preferable to provide alignment marks at the four corners of the substrate simultaneously with the formation of the color filter.
Next, an ITO conductive film is formed on the color filter, and the ITO conductive film is patterned so as to correspond to the position of each color filter to provide a line-shaped transparent ITO electrode.
In the above-described example, the color filter including the red filter (R), the green filter (G), and the blue-purple filter (B) is used as an example of the color filter. However, the present invention is not limited to this. For example, a color filter composed of a set of cyan, magenta, and yellow can 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, and if it is thicker than 5000 μm, it will be a thin information display panel. 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, ellipse, square, and stripe, but the color filter material (ink) has a surface tension. Is preferred.

A photosensitive resin light-shielding layer is provided on the surface of the transparent glass substrate on which the predetermined ITO electrode is formed, on which the ITO electrode is formed, and the photosensitive resin light-shielding layer is provided in a bank having a matrix-like opening (black matrix). Then, patterning was formed by well-known lithography.
Next, a matrix-like opening section separated by a black matrix, and a red color filter material (R), a green color filter material (G), and a blue-purple color filter material (B) are combined into three adjacent openings. Thus, each color filter material is arranged by an ink jet method.

  For the three color filter materials, 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-Purple) was prepared, and the color filter material (ink) having the following configuration was prepared 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.
As the display medium moving display panel for driving performance evaluation shown in Examples and Comparative Examples, a white display medium composed of white charged particles having an average particle diameter of about 10 μm and the white charged particles have a charging polarity. A structure in which a black display medium composed of different black charged particles having an average particle diameter of about 10 μm is enclosed in a cell between panel substrates having a matrix-like opening of 50 μm □ while maintaining a substrate spacing of 50 μm. The thing of was used.

<Example 1>
Formulation examples A-1 to A-3 of water-based thermosetting inks shown in Tables 1 to 3 below are shown.
Table 1 is Formulation Example A-1 in which no surface roughness fine particles are used.
Table 2 shows a blending example A-2 containing 20% by weight of acrylic resin fine particles as fine particles for adjusting the surface roughness.
Table 3 shows Formulation Example A-3 containing 20% by weight of silica fine particles coated with acrylic resin as fine particles for adjusting the surface roughness.

Using the panel substrate provided with the color filters of the above blending examples A-1, A-2, and A-3, the display panels shown in Examples and Comparative Examples were prepared, and the voltage potential applied to the electrodes of the display panel And reversing the display of the white display medium (particles) and the black display medium (particles) by reversing the direction of the electric field applied between the substrates, and repeating the display rewriting 100,000 times, and the display state is observed. 4 shows.
In Examples 1 to 3 and Comparative Examples 1 and 2, in Formulation Example A-1, the surface roughness of the color filter surface in contact with the display medium was adjusted by the presence or absence of the sandblast treatment without using the surface roughness adjusting fine particles.
Examples 4 to 9 and Comparative Examples 3 and 4 are Formulation Examples A-2 and A-3, and the surface roughness of the color filter surface in contact with the display medium by changing the material and average particle diameter of the surface roughness adjusting fine particles. Adjusted.

  From the results shown in Table 4, the color filter having a surface roughness in the range of 20 to 1000 nm by either the sandblasting treatment or the surface roughness adjusting fine particles does not display the display medium particles even after repeated reversal driving up to 100,000 times. It was shown that there was no phenomenon of being stuck to the substrate and not being driven.

<Example 2>
Formulation examples B-1 to B-3 of the photocurable inks shown in Tables 5 to 7 below are shown.
Table 5 is a formulation example B-1 in which the surface roughness fine particles are not used.
Table 6 shows a blending example B-2 containing 20% by weight of acrylic resin fine particles as fine particles for adjusting the surface roughness.
Table 7 is a blending example B-3 containing 20% by weight of silica fine particles coated with acrylic resin as fine particles for adjusting the surface roughness.

Using the panel substrate provided with the color filters of the above blending examples B-1, B-2, and B-3, the display panels shown in the examples and comparative examples are manufactured, and the voltage potential applied to the electrodes of the display panel And reversing the display of the white display medium (particles) and the black display medium (particles) by reversing the direction of the electric field applied between the substrates, and repeating the display rewriting 100,000 times, and the display state is observed. It is shown in FIG.
Examples 11 to 13 and Comparative Examples 11 and 12 are Formulation Example B-1, which does not use surface roughness adjusting fine particles, and the surface roughness of the color filter surface in contact with the display medium depending on the presence or absence of the sandblast treatment as shown in Adjusted.
Examples 14 to 19 and Comparative Examples 13 and 14 are Formulation Examples B-2 and B-3, and the surface roughness of the color filter surface in contact with the display medium by changing the material and average particle diameter of the surface roughness adjusting fine particles. Adjusted.

  From the results shown in Table 8, the color filter having a surface roughness in the range of 20 to 1000 nm by either the sandblasting treatment or the surface roughness adjusting fine particles shows that the display medium particles are not subjected to repeated inversion driving up to 100,000 times. It was shown that there was no phenomenon of being stuck to the substrate and not being driven.

  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 score, display unit of RF-ID device, as well as display unit of various electronic devices 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. It is the block diagram which provided the color filter of this invention in the board | substrate with a line electrode. FIG. 5 is a configuration diagram in which individual electrodes are provided on the color filter of the present invention. 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.

Explanation of symbols

1, 2 Substrate 3 Display medium 3W White display medium 3Wa White particles for display 3B Black display medium 3Ba Black particles for display 4 Bulkhead 5, 6 Electrode 5L, 6L Line electrode 11 Color filter 11R Red color filter 11G Green color filter 11B Blue purple Color filter 14 banks (black matrix)

Claims (7)

For information display in which a display medium is sealed in a space partitioned by a partition wall between at least one transparent substrate and the display medium is moved by an electric field formed by an electrode provided on the substrate to display information such as an image A panel,
A color filter is disposed on the inner surface of the substrate ,
The color filter includes at least a coloring material, and a binder resin is composed of a color filter material containing a surface roughness adjustment microparticles, Ri range der surface roughness Ra of the color filter is 20 nm to 1000 nm, a surface the information display panel average particle size of the coarse adjustment for fine particles, wherein 20nm~1000nm der Rukoto. The information display panel according to claim 1, wherein the electrode and the color filter are arranged in this order on the inner surface of the substrate. The information display panel according to claim 1, wherein the color filter and the electrode are arranged in this order on the inner surface of the substrate. The information display panel according to claim 1 , wherein the color filter material includes a thermosetting resin. The information display panel according to claim 1 , wherein the color filter material includes a photocurable resin. The information display panel according to claim 1 , wherein the color filter is manufactured using an inkjet. 7. The color filter according to claim 1 , wherein color display is performed using color filters of three primary colors (R: red, G: green, B: bluish purple) as constituent members. The information display panel described in 1.

Images