JP2006293154A - Method for manufacturing panel for information display, and panel for information display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a panel for information display that can secure excellent display quality by securely removing air from the space between substrates. <P>SOLUTION: The method for manufacturing the panel for information display which has a white display medium 3W and a black display medium 3B as one or more kinds of display media consisting of at least one ore more kinds of particles charged between two opposed filmy substrates 1 and 2 at least one of which is transparent and moves the display media by applying an electric field to the display media to display information is characterized in that laminating processing for sticking the two filmy substrates 1 and 2 together is carried out in a stage of sticking the two filmy substrates 1 and 2 together by passing the two filmy substrates 1 and 2 through the gap 12 between a couple of rolls 11a and 11b driven to rotate in mutually opposite directions and air present in the space between the filmy substrates 1 and 2 is discharged from the space. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for manufacturing an information display panel and an information display panel. In particular, the present invention relates to a reversible method that can repeatedly display information such as images by moving a display medium by means of an electric field force or a Coulomb force. The present invention relates to a method for manufacturing a sex information display panel and a reversible information display panel.

  2. Description of the Related Art Conventionally, information display devices that use technologies such as electrophoresis, toner (particle) transfer, electrochromic, thermal, and two-color particle rotation have been proposed as information displays that replace liquid crystal (LCD). Yes.

  Compared to LCDs, these conventional technologies have advantages such as a wide viewing angle close to that of ordinary printed materials, low power consumption, and a memory function. It is considered as a technology that can be used for mobile phones, and is expected to expand to information display for mobile terminals, electronic paper, and the like. In particular, recently, an electrophoretic method (for example, see Non-Patent Document 1) in which a dispersion liquid composed of dispersion particles and a colored solution is microencapsulated and disposed between opposing substrates has been proposed and expected. It has been.

  However, the electrophoresis method has a problem that the response speed becomes slow due to the viscous resistance of the liquid because the particles migrate in the liquid. In addition, since particles with high specific gravity such as titanium oxide are dispersed in a solution with low specific gravity, it is easy to settle, and it is difficult to maintain the stability of the dispersed state, and there is a problem that the stability of repeated information display is lacking. ing. Even when microencapsulation is performed, the cell size is set to the microcapsule level, and the above-described drawbacks are hardly made to appear, and the essential problems are not solved at all.

  On the other hand, a method in which conductive particles and a charge transport layer are incorporated into a part of a substrate without using a solution is proposed instead of an electrophoresis method using behavior in a solution (see, for example, Non-Patent Document 1). ). However, this method has a problem that the structure is complicated because the charge transport layer and further the charge generation layer are arranged, and that it is difficult to inject the charges into the conductive particles, so that the stability is lacking. .

  In order to solve the various problems described above, at least one type of display medium composed of at least one type of particles is sealed between two opposing substrates, at least one of which is transparent, and an electric field is applied to the display medium. There is known an information display panel for displaying information by moving a display medium by applying the above. Such an information display panel is manufactured, for example, by bonding one substrate having an adhesive applied to the upper surface of a partition wall (spacer) and the other substrate.

趙 Kuniori and three others, “New Toner Display Device (I)”, July 21, 1999, Annual Meeting of the Imaging Society of Japan (83 times in total) “Japan Hardcopy’99”, p.249-252

  In the conventional information display panel manufacturing method described above, when two film substrates are used as the two substrates, air enters the space between the substrates when the two film substrates are bonded together. In some cases, when air enters, the air remains in the space between the substrates when the two film-like substrates are pressed into a final information display panel by a press device. Therefore, the display quality is degraded.

  An object of this invention is to provide the manufacturing method of the information display panel which can ensure favorable display quality by removing air reliably from the space between board | substrates.

  In order to achieve the above object, a method for manufacturing an information display panel according to a first aspect of the present invention provides at least one display comprising at least one kind of particles between two opposing substrates, at least one of which is transparent. An information display panel manufacturing method for enclosing a medium and displaying information by moving the display medium by applying an electric field to the display medium, wherein two film-like substrates used as the two substrates are bonded. The laminating process is performed in which the two film-like substrates are bonded together by passing the two film-like substrates through a gap between a pair of rolls that are rotationally driven in opposite directions in the aligning step. .

  In order to achieve the above object, the method for producing an information display panel according to the second aspect of the present invention provides at least one type of display comprising at least one type of particles between two opposing substrates, at least one of which is transparent. An information display panel manufacturing method for enclosing a medium and displaying information by moving the display medium by applying an electric field to the display medium, wherein two film-like substrates used as the two substrates are bonded. After the bonding step is completed, the two film-like substrates after bonding are passed through a gap between a pair of rolls that are rotationally driven in opposite directions, thereby allowing a space between the two film-like substrates after bonding. The air removal process which extrudes and removes air from is performed.

In order to achieve the above object, a method for manufacturing an information display panel according to a third aspect of the present invention is the method according to the first aspect, the second aspect of the invention, the surface plate and the gap on the surface plate instead of the pair of rolls, or Using a roll arranged so as to maintain a constant pressure in contact with the roll, the roll is moved in a horizontal direction in a free rotation state, or the two films with respect to the roll in a free rotation state The laminating process or the air removing process is performed by relatively moving the plate-like substrate in the horizontal direction.
As a preferred example of the method for producing an information display panel of the present invention, the display medium may be a particle group composed of particles for display medium or a powder fluid composed of particles for display medium.
The information display panel of the present invention is manufactured using the method for manufacturing an information display panel according to any one of claims 1 to 4.

  According to the method for manufacturing an information display panel of the first invention, at least one type of display medium composed of at least one type of particles is sealed between two opposing substrates, at least one of which is transparent. When manufacturing an information display panel that displays information by moving the display medium by applying an electric field to the display medium, in the bonding process of the two film-like substrates used as the two substrates, Since the two film-like substrates are laminated by passing the two film-like substrates through a gap between a pair of rolls that are driven to rotate in opposite directions, after the lamination process is completed, The air existing in the space between the two film-like substrates is discharged out of the space. Therefore, it is possible to provide a method for manufacturing an information display panel that can ensure good display quality by reliably removing air from the space between the substrates.

  According to the method for manufacturing an information display panel of the second invention, at least one display medium composed of at least one kind of particles is sealed between two opposing substrates, at least one of which is transparent. When manufacturing an information display panel that displays information by moving the display medium by applying an electric field to the display medium, the bonding process of the two film-like substrates used as the two substrates is completed. Later, by passing the two film-like substrates after bonding through a gap between a pair of rolls that are driven to rotate in opposite directions, air is pushed out from the space between the two film-like substrates after bonding. Therefore, after the air removal process is completed, the air present in the space between the two film-like substrates after bonding is discharged outside the space. To become. Therefore, it is possible to provide a method for manufacturing an information display panel that can ensure good display quality by reliably removing air from the space between the substrates.

  According to the method for manufacturing the information display panel of the third invention, in the method for manufacturing the information display panel of the first invention and the second invention, in place of the pair of rolls, a surface plate and the surface plate The roll is arranged so as to maintain a constant pressure in the gap or in contact with the roll, and the roll is moved in a horizontal direction in a free rotation state, or with respect to the roll in a free rotation state. Since the laminating process or the air removing process is performed by relatively moving the two film-like substrates in the horizontal direction, after the laminating process or the air removing process is completed, between the two film-like substrates. The air existing in the space is exhausted out of the space. Therefore, it is possible to provide a method for manufacturing an information display panel that can ensure good display quality by reliably removing air from the space between the substrates.

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

  First, the configuration of the information display panel of the present invention will be described. In the information display panel of the present invention, an electric field is applied by some means in the substrate of the information display panel in which the display medium is sealed between the opposing substrates. The display medium charged in accordance with the electric field direction is attracted by the force of the electric field or the Coulomb force, and the display medium changes its moving direction by switching the electric field direction, thereby displaying information. Therefore, it is necessary to design an information display panel so that the display medium can move uniformly and maintain stability when rewriting display repeatedly or when information is continuously displayed and stored. Here, as the force applied to the particles constituting the display medium, in addition to the force attracted by the Coulomb force between the particles, an electric image force with the electrode, an intermolecular force, a liquid cross-linking force, gravity and the like can be considered.

An example of an information display panel applicable to the information display device 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, for white display media) each having at least one type of particles and having different optical reflectance and charging characteristics are used. White display medium 3W composed of particles composed of particles and black display medium 3B composed of particles composed of particles for black display medium) according to the electric field applied from the outside of the substrates 1 and 2, The black display medium 3B is moved vertically to the substrates 1 and 2 so that the observer can visually recognize the black display, or the white display medium 3W is visually recognized by the observer and the 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 to form a cell, for example.
In the example shown in FIGS. 2A and 2B, at least two or more types of display media 3 (here, for white display media) each having at least one type of particles and having different optical reflectance and charging characteristics are used. The electrode 5 provided on the substrate 1 and the electrode 2 provided on the substrate 2 are a white display medium 3W composed of particles composed of particles and a black display medium 3B composed of particles composed of particles for black display media). 6 is moved vertically to the substrates 1 and 2 in accordance with an electric field generated by applying a voltage between them and the black display medium 3B is visually recognized by the observer to display black or white display The medium 3W is visually recognized by an observer and white display is performed. In the example shown in FIG. 2 (b), in addition to the example shown in FIG. 2 (a), a partition 4 is provided between the substrates 1 and 2 to form cells, for example.
In the example shown in FIGS. 3 (a) and 3 (b), one type of display medium 3 (here, composed of particles for white display medium) having optical reflectivity and chargeability composed of at least one kind of particles. In a direction parallel to the substrates 1 and 2 according to the electric field generated by applying a voltage between the electrode 5 and the electrode 6 provided on the substrate 1. The white display medium 3W is moved and the observer visually recognizes the white display, 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, in addition to the example shown in FIG. 3A, for example, a lattice-shaped partition wall 4 is provided between the substrates 1 and 2 to form a cell.
In the above description, the white display medium 3W composed of particles composed of particles for white display medium is replaced with the white display medium 3W composed of powdered fluid composed of particles for white display medium, and the particles for black display medium. The same applies when the black display medium 3 </ b> B composed of the particle group is replaced with the black display medium 3 </ b> B composed of the powder fluid composed of the particles for the black display medium.

  Hereinafter, a method for manufacturing an information display panel, which is a feature of the present invention, will be described in detail. The information display panel of the present invention encloses at least one type of display medium composed of at least one type of particles between two opposing substrates, at least one of which is transparent, and applies an electric field to the display medium. This is an information display panel that displays information by moving the display medium, and is manufactured by a series of steps shown in FIGS. 4, 5, 6 (a), and 6 (b). In the manufacturing method of the information display panel of the present invention (the manufacturing method 1 in FIG. 1, the manufacturing method 2 in FIG. 5, the manufacturing method 3 in FIG. 6 (a), and the manufacturing method 4 in FIG. 6 (b)), A process for removing air in the space between the two substrates during the bonding process of the two film-like substrates used as the substrate or after completion of the bonding process of the two film-like substrates (FIG. 4, 6 (a) is characterized in that laminating is performed, and in FIGS. 5 and 6 (b), air removal is performed. In the following, detailed description of steps similar to those of the prior art will be omitted.

[Manufacturing method 1; see FIG. 4 and manufacturing method 3; see FIG. 6 (a)]
(1) Partition wall (rib) and electrode pattern forming step on a film substrate (not shown, the electrode pattern forming step is performed only when an electrode is required)
(2) Step of filling display medium onto film substrate (3) Step of removing unnecessary display medium on partition walls (so-called powder removing step)
(4) Adhesive application process to the partition (this adhesive application process may be performed before the display medium filling process)
(5) Bonding process of two film substrates (6) Hot pressing process of two film substrates

In the bonding step (5) above, by passing the two film-like substrates 1 and 2 through the gap 12 between the pair of rolls 11a and 11b that are rotationally driven in directions opposite to each other as shown by arrows in FIG. Alternatively, as shown in FIG. 6 (a), the roll 11a is placed in a free rotating state in the counterclockwise direction as shown in the figure by using the surface plate 13 and the roll 11a arranged so as to keep the gap 12 on the surface plate 13. The surface plate 13 moves the two film-like substrates 1 and 2 against a roll 11a that is moved in the horizontal direction (left direction in the figure) while being rotated or is in a free rotation state in the counterclockwise direction as shown in the figure. A laminating process for bonding the two film-like substrates 1 and 2 is performed by relatively moving in the horizontal direction (right direction in the figure). By this laminating process, the air existing between the two film-like substrates 1 and 2 is caused by the movement of the two film-like substrates 1 and 2 in the right direction in FIG. As the shaped substrates 1 and 2 move relative to the roll 11a in the right direction in FIG. 6A, they gradually move in the left direction in FIG. 4 and FIG. 6A to complete the laminating process. Later, the air existing in the space between the two film-like substrates 1 and 2 is discharged out of the space.
Therefore, according to the manufacturing method 1 and manufacturing method 3 of the present invention, an information display panel that can ensure good display quality by reliably removing air from the space between the two film-like substrates 1 and 2. The manufacturing method of can be provided.

[Manufacturing method 2; see FIG. 5 and Manufacturing method 4; see FIG. 6 (b)]
(1) Partition wall (rib) and electrode pattern forming step on a film substrate (not shown, the electrode pattern forming step is performed only when an electrode is required)
(2) Step of filling display medium onto film substrate (3) Step of removing unnecessary display medium on partition walls (so-called powder removing step)
(4) Adhesive application process to the partition (this adhesive application process may be performed before the display medium filling process)
(5) Bonding process of two film substrates (superposition process of two film substrates for positioning and temporary fixing)
(6) Air removal process (air extrusion removal process) from two film-like substrates
(7) Hot pressing process for two film substrates

In the air removal step (6), the two film-like substrates 1 and 2 after bonding are passed through the gap 12 between the pair of rolls 11a and 11b that are driven to rotate in opposite directions, or As shown in FIG. 6 (b), using the surface plate 13 and the roll 11a arranged so as to keep the gap 12 on the surface plate 13, the roll 11a is horizontally rotated while being rotated freely in the counterclockwise direction as shown in the figure. The two film-like substrates 1 and 2 after the surface plate 13 is bonded to the roll 11a that is moved in the direction (left direction in the figure) or is in a free rotation state in the counterclockwise direction as shown in the figure. By performing relative movement in the horizontal direction (right direction in the figure), air removal processing is performed in which air is pushed out and removed from the space between the two film-like substrates 1 and 2 after bonding. By this air removing process, the air existing between the two film-like substrates 1 and 2 after bonding is such that the two film-like substrates 1 and 2 after bonding move to the right in FIG. As the two film-like substrates 1 and 2 after bonding are moved relative to the roll 11a in the right direction of FIG. 6B, gradually, FIG. 5 and FIG. ) To the left, and after the air removal process is completed, the air existing in the space between the two film-like substrates 1 and 2 after being bonded is discharged out of the space.
Therefore, according to the manufacturing method 2 and the manufacturing method 4 of the present invention, it is possible to provide a method for manufacturing an information display panel that can ensure good display quality by reliably removing air from the space between the substrates. it can.

  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 film-like substrate in which the color of the display medium can be confirmed from the outside of the information display panel, and a material having high visible light transmittance and good heat resistance is preferable. The other substrate may be a transparent film substrate or an opaque film substrate. Examples of the substrate material include polymer sheets such as polyethylene terephthalate, polyethersulfone, polyethylene, polycarbonate, polyimide, and acrylic, and flexible materials such as metal sheets. 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.

  The electrode forming material for the electrodes 5 and 6 when the electrodes are provided on the substrate of the information display panel includes metals such as aluminum, silver, nickel, copper, and gold, ITO, indium oxide, conductive tin oxide, and conductive oxide. Examples include conductive metal oxides such as zinc, and conductive polymers such as polyaniline, polypyrrole, and polythiophene, which are appropriately selected and used. As a method for forming an electrode, a method of forming the above-described materials into a thin film by sputtering, vacuum deposition, CVD (chemical vapor deposition), coating, or the like, or mixing a conductive agent with a solvent or a synthetic resin binder. The method of apply | coating is used. In many cases, the electrode provided on the display surface side substrate needs to be transparent, but the electrode provided on the back surface side substrate does not need to be transparent. In any case, the material that can be patterned and is electrically conductive can be preferably 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 partition 4 provided on the substrate as needed is optimally set according to the type of display medium involved in the display and is not limited in general, but the width of the partition is 2 to 100 μm, preferably 3 to 50 μm. The height of the partition wall is adjusted to 10 to 500 μm, preferably 10 to 200 μm. In forming the partition walls, a both-rib method in which ribs are formed on each of the opposing substrates and then bonded, and a one-rib method in which ribs are formed only on one substrate are conceivable. In the present invention, any method is preferably used.

  As shown in FIG. 7, the cells formed by the partition walls made of these ribs are exemplified by a square shape, a triangular shape, a line shape, a circular shape, and a hexagonal shape as viewed from the substrate plane direction. And a mesh shape. It is better to make the portion corresponding to the cross section of the partition wall visible from the display surface side (the area of the cell frame) as small as possible, and the clearness of information display increases. Here, examples of the method for forming the partition include a mold transfer method, a screen printing method, a sand blast method, a photolithography method, and an additive method. Among these, a photolithography method using a resist film and a mold transfer method are preferably used.

  Next, the powder fluid used as a display medium in the information display panel of the present invention will be described. As for the name of the powder fluid as the display medium of the present invention, the present applicant has obtained the right of “Electronic Powder Fluid (registered trademark): Registration No. 4636931”.

  The “powder fluid” in the present invention is a substance in an intermediate state of both fluid and particle characteristics that exhibits fluidity by itself without borrowing the force of gas or liquid. For example, liquid crystal is defined as an intermediate phase between a liquid and a solid, and has fluidity that is a characteristic of liquid and anisotropy (optical properties) that is a characteristic of solid (Heibonsha: Encyclopedia) . On the other hand, the definition of particle is an object with a finite mass even if it is negligible, and is said to be affected by gravity (Maruzen: Physics Encyclopedia). Here, even in the case of particles, there are special states of gas-solid fluidized bed and liquid-solid fluids. When gas is flowed from the bottom plate to the particles, upward force is applied to the particles according to the velocity of the gas. Is a gas-solid fluidized bed that is in a state where it can easily flow when it balances with gravity, and it is also called a liquid-solid fluidized state that is fluidized by a fluid (ordinary) Company: Encyclopedia). As described above, the gas-solid fluidized bed body and the liquid-solid fluid are in a state of using a gas or liquid flow. In the present invention, it has been found that a substance in a state of fluidity can be produced specifically without borrowing the force of such gas and liquid, and this is defined as powder fluid.

  That is, the pulverulent fluid in the present invention is in an intermediate state having both the characteristics of particles and liquid, as in the definition of liquid crystal (liquid and solid intermediate phase), and is the characteristic of the above-mentioned particles. It is a substance that is extremely unaffected and exhibits a unique state with high fluidity. Such a substance can be obtained in an aerosol state, that is, in a dispersion system in which a solid or liquid substance is stably suspended as a dispersoid in a gas, and the solid substance is regarded as a dispersoid in the information display panel of the present invention. To do.

The information display panel of the present invention encloses a powder fluid that exhibits high fluidity in an aerosol state in which solid particles are stably suspended as a dispersoid, for example, as a display medium, between opposing substrates, at least one of which is transparent. Such a powder fluid can be easily and stably moved by a Coulomb force or the like by applying a low voltage.
As described above, for example, the powder fluid used as the display medium in the present invention is a substance in the intermediate state between the fluid and particles that exhibits fluidity by itself without borrowing the force of gas or liquid. It is. This powder fluid can be in an aerosol state in particular, and in the information display panel of the present invention, a solid substance is used in a state of relatively stably floating as a dispersoid in the gas.

Next, display medium particles (hereinafter also referred to as particles) constituting the display medium in the information display panel of the present invention will be described. The display medium particles are composed of the display medium particles as they are to form a display medium, or are combined with other particles to form a display medium, or adjusted and configured to become a powder fluid to form a display medium. Or used.
The particles can contain a charge control agent, a colorant, an inorganic additive, and the like, if necessary, in the resin as the main component, as in the conventional case. Examples of resins, charge control agents, colorants, and other additives will be given below.

  Examples of the resin include urethane resin, urea resin, acrylic resin, polyester resin, acrylic urethane resin, acrylic urethane silicone resin, acrylic urethane fluororesin, acrylic fluororesin, silicone resin, acrylic silicone resin, epoxy resin, polystyrene resin, styrene Acrylic resin, polyolefin resin, butyral resin, vinylidene chloride resin, melamine resin, phenol resin, fluororesin, polycarbonate resin, polysulfone resin, polyether resin, polyamide resin and the like can be mentioned, and two or more kinds can be mixed. In particular, acrylic urethane resin, acrylic silicone resin, acrylic fluororesin, acrylic urethane silicone resin, acrylic urethane fluororesin, fluororesin, and silicone resin are suitable from the viewpoint of controlling the adhesive force with the substrate.

  The charge control agent is not particularly limited. Examples of the negative charge control agent include salicylic acid metal complexes, metal-containing azo dyes, metal-containing oil-soluble dyes (including metal ions and metal atoms), and quaternary ammonium salt systems. Examples thereof include compounds, calixarene compounds, boron-containing compounds (benzyl acid boron complexes), and nitroimidazole derivatives. Examples of the positive charge control agent include nigrosine dyes, triphenylmethane compounds, quaternary ammonium salt compounds, polyamine resins, imidazole derivatives, and the like. In addition, metal oxides such as ultrafine silica, ultrafine titanium oxide, ultrafine alumina, nitrogen-containing cyclic compounds such as pyridine and derivatives and salts thereof, various organic pigments, resins containing fluorine, chlorine, nitrogen, etc. are also charged. It can also be used as a control agent.

  As the colorant, various organic or inorganic pigments and dyes as exemplified below can be used.

Examples of the black colorant include carbon black, copper oxide, manganese dioxide, aniline black, activated carbon and the like.
Examples of blue colorants include C.I. I. Pigment blue 15: 3, C.I. I. Pigment Blue 15, Bituminous Blue, Cobalt Blue, Alkaline Blue Lake, Victoria Blue Lake, Phthalocyanine Blue, Metal-free Phthalocyanine Blue, Phthalocyanine Blue Partial Chlorides, Fast Sky Blue, Indanthrene Blue BC, and the like.
Examples of red colorants 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, Alizarin Lake, Brilliant Carmine 3B, C.I. I. Pigment Red 2 etc.

Yellow colorants include chrome yellow, 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 Yellow Lake, Permanent Yellow NCG, Tartrazine Lake, C.I. I. Pigment Yellow 12 etc.
Examples of green colorants include chrome green, chromium oxide, pigment green B, C.I. I. Pigment Green 7, Malachite Green Lake, Final Yellow Green G, etc.
Examples of the orange colorant include red chrome yellow, molybdenum orange, permanent orange GTR, pyrazolone orange, Vulcan orange, indanthrene brilliant orange RK, benzidine orange G, indanthrene brilliant orange GK, C.I. I. Pigment Orange 31 etc.
Examples of purple colorants include manganese purple, first violet B, and methyl violet lake.
Examples of white colorants include zinc white, titanium oxide, antimony white, and zinc sulfide.

  Examples of extender pigments include barite powder, barium carbonate, clay, silica, white carbon, talc, and alumina white. Examples of various dyes such as basic, acidic, disperse, and direct dyes include nigrosine, methylene blue, rose bengal, quinoline yellow, and ultramarine blue.

Examples of inorganic additives include titanium oxide, zinc white, zinc sulfide, antimony oxide, calcium carbonate, lead white, talc, silica, calcium silicate, alumina white, cadmium yellow, cadmium red, cadmium orange, titanium yellow, Examples include bitumen, ultramarine blue, cobalt blue, cobalt green, cobalt violet, iron oxide, carbon black, manganese ferrite black, cobalt ferrite black, copper powder, and aluminum powder.
These pigments and inorganic additives can be used alone or in combination. Of these, carbon black is particularly preferable as the black pigment, and titanium oxide is preferable as the white pigment.

  Further, the particles of the present invention preferably have an average particle diameter d (0.5) in the range of 0.1 to 20 μm, and are uniform and uniform. If the average particle diameter d (0.5) is larger than this range, the display is not clear, and if it is smaller than this range, the cohesive force between the particles becomes too large, which hinders the movement of the particles.

Furthermore, in the present invention, regarding the particle size distribution of each particle, the particle size distribution Span represented by the following formula is set to less than 5, preferably less than 3.
Span = (d (0.9) −d (0.1)) / d (0.5)
(However, d (0.5) is a numerical value indicating the particle diameter in μm that 50% of the particles are larger than this, and 50% is smaller than this, and d (0.1) is a particle in which the ratio of the smaller particles is 10%. (Numerical value expressed in μm, and d (0.9) is a numerical value expressed in μm for a particle size of 90% or less.)
By keeping Span within a range of 5 or less, the size of each particle is uniform and uniform particle movement is possible.

  Furthermore, regarding the correlation between the particles, the ratio of the d (0.5) of the particles having the minimum diameter to the d (0.5) of the particles having the maximum diameter among the used particles is set to 50 or less, preferably 10 or less. It is essential. Even if the particle size distribution Span is reduced, particles with different charging characteristics move in opposite directions, so that the particle size is close to each other and each particle can be easily moved in the opposite direction by the equivalent amount. This is within this range.

The particle size distribution and the particle size can be obtained from a laser diffraction / scattering method or the like. When laser light is irradiated onto particles to be measured, a light intensity distribution pattern of diffracted / scattered light is spatially generated, and this light intensity pattern has a corresponding relationship with the particle diameter, so that the particle diameter and particle diameter distribution can be measured. .
Here, the particle size and particle size distribution in the present invention are obtained from a volume-based distribution. Specifically, using a Mastersizer2000 (Malvern Instruments Ltd.) measuring instrument, particles are introduced into a nitrogen stream, and the attached analysis software (software based on volume-based distribution using Mie theory) The diameter and particle size distribution can be measured.

  The charge amount of the display medium particles naturally depends on the measurement conditions, but the charge amount of the display medium particles in the information display panel is almost the same as the initial charge amount, the contact with the partition walls, the contact with the substrate, and the elapsed time. It was found that depending on the charge decay, the saturation value of the charging behavior of the particles for the display medium is a dominant factor.

  As a result of intensive studies, the present inventors have been able to evaluate the range of proper charging characteristics of display medium particles by measuring the charge amount of the particles used in the display medium using the same carrier particles in the blow-off method. I found.

Furthermore, in the present invention, when a display medium such as a particle group or a powdered fluid is used for a dry information display panel, it is important to manage the gas in the void surrounding the display medium between the substrates, and display stability is improved. Contribute to. Specifically, it is important that the relative humidity at 25 ° C. is 60% RH or less, preferably 50% RH or less, more preferably 35% RH or less with respect to the humidity of the gas in the gap.
1A, 1B, 3A, and 3B, the gaps are defined as electrodes 5 and 6 (electrodes are formed on the inner side of the substrate) from portions sandwiched between the opposing substrates 1 and 2. Gas portion in contact with a so-called display medium, excluding the occupied portion of the display medium (particle group or powdered fluid) 3, the occupied portion of the partition wall 4 (when provided with the partition wall), and the seal portion of the information display panel. Shall be pointed to.
The gas in the gap is not limited as long as it is in the humidity region described above, but dry air, dry nitrogen, dry argon, dry helium, dry carbon dioxide, dry methane, and the like are preferable. This gas needs to be sealed in an information display panel so that the humidity is maintained, for example, filling a display medium, assembling an information display panel, etc. in a predetermined humidity environment, It is important to apply a sealing material and a sealing method that prevent moisture from entering from the outside.

The distance between the substrates in the information display panel of the present invention is not limited as long as the display medium can be moved and the contrast can be maintained, but is usually adjusted to 10 to 500 μm, preferably 10 to 200 μm.
The volume occupation ratio of the display medium in the space between the opposing substrates is preferably 5 to 70%, more preferably 5 to 60%. When it exceeds 70%, the movement of the display medium is hindered, and when it is less than 5%, the contrast tends to be unclear.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to Examples 1 and 2 and a comparative example of the present invention. However, the present invention is not limited to the following examples. In addition, the information display panels of Examples 1 and 2 and Comparative Example 1 were evaluated by the following methods according to the following criteria.

<Example 1>
The information display panel of Example 1 was manufactured by the manufacturing method 1 shown in FIG.
First, in the partition wall (rib) and electrode pattern forming step (1) on the film-like substrate, an opening of 300 μm □ is formed by a photoresist method on a PET film (thickness 200 μm) coated with 30 Ω / □ ITO. Then, an electrode with a partition wall having a line width of 100 μm and a height of 100 μm was formed. In the next filling step (2) of the display medium onto the film-like substrate, white particles and black particles having different charging characteristics are sealed as 6 g / m ² in the cell by the free fall method. did. After the unnecessary display medium removal step (3) on the next partition wall is performed, in the adhesive coating step (4) on the partition wall of the film substrate, a sealant is applied to the four sides of the film substrate and The adhesive was applied to At that time, “AE400” manufactured by Ajinomoto Fine Techno Co., Ltd. was used as a sealing material and an adhesive.
Thereafter, in the bonding step (5) of the two film-like substrates, the two film-like substrates 1, 1 are inserted into the gap 12 between the pair of rolls 11a and 11b that are rotationally driven in opposite directions as indicated by arrows in FIG. By passing 2 through, the laminating process which bonds the two film-like substrates 1 and 2 was performed, and the air existing in the space between the two film-like substrates 1 and 2 was discharged out of the space. Then, the information display panel of Example 1 was completed by performing the hot pressing process (6) of the two film-like substrates.

<Example 2>
The information display panel of Example 1 was manufactured by the manufacturing method 2 shown in FIG.
First, in the partition wall (rib) and electrode pattern forming step (1) on the film-like substrate, an opening of 300 μm □ is formed by a photoresist method on a PET film (thickness 200 μm) coated with 30 Ω / □ ITO. Then, an electrode with a partition wall having a line width of 100 μm and a height of 100 μm was formed. In the next filling step (2) of the display medium onto the film-like substrate, white particles and black particles having different charging characteristics are sealed as 6 g / m ² in the cell by the free fall method. did. After the unnecessary display medium removal step (3) on the next partition wall is performed, in the adhesive coating step (4) on the partition wall of the film substrate, a sealant is applied to the four sides of the film substrate and The adhesive was applied to At that time, “AE400” manufactured by Ajinomoto Fine Techno Co., Ltd. was used as a sealing material and an adhesive. In the next bonding step (5) of the two film-like substrates, the two film-like substrates were superimposed after positioning and temporary fixing.
Thereafter, in the air removing step (6) from the two film-like substrates, the two sheets after being bonded to the gap 12 between the pair of rolls 11a and 11b that are rotationally driven in opposite directions as indicated by arrows in FIG. By passing the film-like substrates 1 and 2, the two films after bonding are subjected to an air removal process for extruding and removing air from the space between the two film-like substrates 1 and 2 after bonding. The air existing in the space between the substrate 1 and 2 was discharged out of the space. Then, the information display panel of Example 1 was completed by performing the hot pressing process (7) of the two film-like substrates.

<Comparative Example 1>
The information display panel of Comparative Example 1 was produced in the same manner as the production method 2 shown in FIG. 5 used in Example 2, but the air removal step (6) in the production method 2 shown in FIG. Then, immediately after the bonding process (5) of the two film-like substrates, the hot pressing process (7) of the two film-like substrates was performed to complete the information display panel of Example 1.

"Evaluation of information display panel"
The information display panels of Examples 1 and 2 and Comparative Example 1 were checked for the bonding state using a microscope, and the case where no air was present in the space between the film substrates 1 and 2 was evaluated as OK. When the presence of air in the space between the film-like substrates 1 and 2 was evaluated as NG, the information display panels of Example 1 and Example 2 were OK, and the information display panel of Comparative Example 1 was NG. Became.

  An information display panel produced by the manufacturing method of the present invention and an information display device equipped with the panel are a display unit of a mobile device such as a notebook computer, PDA, mobile phone, handy terminal, electronic paper such as an electronic book, an electronic newspaper, Billboards such as billboards, posters, blackboards, calculators, home appliances, automotive supplies, card displays such as point cards, IC cards, electronic advertisements, electronic POPs, electronic shelf labels, electronic price tags, electronic musical scores, RF- It is suitably used for a display unit of an ID device.

(A), (b) is a figure which shows an example of the information display panel of this invention. (A), (b) is a figure which shows the other example of the information display panel of this invention. (A), (b) is a figure which shows the further another example of the information display panel of this invention. It is a figure which shows an example of the manufacturing method of the information display panel of this invention. It is a figure which shows the other example of the manufacturing method of the information display panel of this invention. (A), (b) is a figure which shows the further another example of the manufacturing method of the information display panel of this invention, respectively. It is a figure which shows an example of the shape of the partition in the information display panel of this invention.

Explanation of symbols

1 Substrate 2 Substrate 3 Display medium (particle group, powder fluid)
3W white display medium 3B black display medium 4 partition 5 electrode 6 electrode 11a, 11b roll 12 gap 13 surface plate

Claims (5)

At least one type of display medium composed of at least one type of particles is sealed between two opposing substrates at least one of which is transparent, and the display medium is moved by applying an electric field to the display medium. A method of manufacturing an information display panel for displaying information,
In the bonding process of the two film-like substrates used as the two substrates, the two film-like substrates are passed through a gap between a pair of rolls that are driven to rotate in opposite directions. A method for producing an information display panel, comprising: laminating a film-like substrate. At least one type of display medium composed of at least one type of particles is sealed between two opposing substrates at least one of which is transparent, and the display medium is moved by applying an electric field to the display medium. A method of manufacturing an information display panel for displaying information,
By passing the two film-like substrates after bonding through a gap between a pair of rolls driven to rotate in opposite directions after completion of the bonding process of the two film-like substrates used as the two substrates. A method for producing an information display panel, comprising performing an air removal process by extruding and removing air from a space between the two film-like substrates after the bonding.   In place of the pair of rolls, whether or not to move the roll in the horizontal direction in a freely rotating state using a surface plate and a roll disposed on the surface plate so as to maintain a constant pressure in the gap or contact state. Alternatively, the laminating process or the air removing process is performed by relatively moving the two film-like substrates in a horizontal direction with respect to the roll in a freely rotating state. 2. A method for producing the information display panel according to 2.   The information display panel according to any one of claims 1 to 3, wherein the display medium is a particle group composed of particles for display medium or a powder fluid composed of particles for display medium. Production method.   It manufactures using the manufacturing method of the information display panel of any one of Claims 1-4, The information display panel characterized by the above-mentioned.

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