JP2007163671A - Information display panel and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing an information display panel that prevents air from remaining etc., between substrates and improving productivity by performing a sealing agent curing step and an adhesive curing step separately. <P>SOLUTION: In the method for manufacturing the information display panel that displays information of an image etc., by filling a display medium between two substrates 1 and 2 at least one of which is transparent and moving the display medium by applying an electric field to the display medium, the information display panel is manufactured by curing an adhesive which is arranged on the substrate 1 and has a slow curing speed in the adhesive curing step after curing a sealing agent which is arranged on the substrate 2 and has a fast curing speed in the sealing agent curing step. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention manufactures an information display panel that displays information such as an image by moving a display medium by enclosing the display medium between two transparent substrates and applying an electric field to the display medium. The present invention relates to a method and an information display panel manufactured by using the manufacturing method.

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

  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. Particularly recently, an electrophoretic method in which a dispersion liquid composed of dispersed particles and a colored solution is encapsulated and disposed between opposing substrates has been proposed and is expected.

  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 complicated structure due to the arrangement of the charge transport layer and further the charge generation layer, and it is difficult to inject constant charges into the conductive particles. There is also a problem of lacking.

  As a method for solving the various problems described above, a display medium is sealed between two substrates, at least one of which is transparent, and an electric field is applied to the display medium, thereby moving the display medium to An information display panel for displaying information is known.

趙 Kuniaki 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” Proceedings, p.249-252

When it is going to produce the said information display panel by bonding together two film substrates, when gas, such as air, is left between film substrates, when two film substrates are bonded ( When adhering), a gas such as air may be compressed and remain inside, or the cell may be deformed.
As a countermeasure, there is a method of preventing the remaining of gas such as air by reducing the space between the substrates by performing the film substrate bonding step (adhesive curing step) in a reduced pressure state. However, when the adhesive disposed on the upper part of the partition and the sealing material disposed at a predetermined position on the substrate are cured at the same time under reduced pressure, it takes time to cure the adhesive, and the productivity is lowered.

The present invention provides a method for manufacturing an information display panel that achieves both prevention of residual air between substrates and improvement of productivity by carrying out the sealing agent curing step and the adhesive curing step as separate steps. This is the first purpose.
A second object of the present invention is to provide an information display panel that uses both the above-described method for manufacturing an information display panel to achieve both prevention of remaining air between substrates and improvement in productivity.

  In order to achieve the first object, a method for manufacturing an information display panel according to the present invention includes a display medium enclosed between two substrates, at least one of which is transparent, and an electric field is applied to the display medium. An information display panel manufacturing method for displaying information such as images by moving a medium, a sealing agent curing step for curing a sealing agent disposed on at least one substrate, and an adhesive disposed on at least one substrate It is characterized by performing the adhesive curing process for curing the resin in a separate process.

  Moreover, as a suitable example of the manufacturing method of the information display panel of the present invention, a sealing agent having a high curing rate is used in the sealing agent curing step, and an adhesive having a slow curing rate is used in the adhesive curing step. The sealing agent curing step is performed under a predetermined reduced pressure, and then the main curing of the adhesive is performed by the adhesive curing step, and the two substrates are continuous in the form of a sheet wound around a roll. Sometimes formed from a substrate.

  In order to achieve the second object, the information display panel of the present invention is manufactured by using the method for manufacturing an information display panel according to any one of claims 1 to 4.

  According to the method for manufacturing the information display panel of the present invention having the above-described configuration, the display medium is moved by enclosing the display medium between two substrates, at least one of which is transparent, and applying an electric field to the display medium. When manufacturing an information display panel for displaying information such as images, a sealing agent curing step for curing the sealing agent disposed on at least one substrate, and an adhesive for curing the adhesive disposed on at least one substrate Since the curing process is performed in a separate process, for example, by performing only the sealant curing process that requires only a short time in a reduced pressure state, the time required for the adhesive curing process is shortened and the productivity is improved while reducing the pressure between the substrates. Thus, the remaining of gas such as air can be prevented. Therefore, it is possible to provide a method for manufacturing an information display panel that achieves both prevention of the remaining of air between substrates and improvement of productivity.

  According to the information display panel of the present invention having the above-described configuration, the information display panel according to any one of claims 1 to 4 is manufactured with high productivity using the method for manufacturing the information display panel. An information display panel that achieves both prevention and improvement in productivity.

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

  First, a basic configuration of an information display panel that is an object of the present invention will be described. In the information display panel which is an object of the present invention, an electric field is applied to a display medium sealed between two opposing substrates. Along with the applied electric field direction, the charged display medium is attracted by the electric field force or Coulomb force, etc., and the display medium changes the moving direction by the electric field direction change due to the potential switching, thereby displaying information such as an image. Made. Therefore, it is necessary to design the information 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 an information display panel that 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 kinds of display media 3 (here, white display medium particles 3Wa) having at least one kind of particles and having different optical reflectance and charging characteristics. A white display medium 3W composed of a group of particles and a black display medium 3B composed of a group of particles 3Ba for black display medium) are perpendicular 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 to form a cell, for example. In addition, in FIG. 1B, the partition in front is omitted.
In the example shown in FIGS. 2A and 2B, at least two kinds of display media 3 (here, white display medium particles 3Wa) having at least one kind of particles and having different optical reflectance and charging characteristics. Between the electrode 5 provided on the substrate 1 and the electrode 6 provided on the substrate 2 is a voltage between the electrode 5 provided on the substrate 1 and the electrode 6 provided on the substrate 2. In accordance with the electric field generated by applying, 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 provided to the observer. A white display is made by visual recognition. 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. Further, in FIG. 2 (b), the front partition is omitted.
In the example shown in FIGS. 3A and 3B, one type of display medium 3 (here, particles of white display medium particles 3Wa) having optical reflectivity and chargeability composed of at least one type of particles. Group white display medium 3W) is moved in a direction parallel to substrates 1 and 2 in accordance with an electric field generated by applying a voltage between electrode 5 and electrode 6 provided on substrate 1; The white display medium 3W is visually recognized by the observer to display white, or the color of the electrode 6 or the substrate 1 is visually recognized by the observer to display the color of the electrode 6 or the substrate 1. 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. Moreover, in FIG.3 (b), the partition in front is abbreviate | omitted.
The above description is similarly applied to the case where the white display medium 3W including the particle group is replaced with the white display medium including the powder fluid and the black display medium 3B including the particle group is replaced with the black display medium including the powder fluid. be able to.

  Hereafter, the manufacturing method of the information display panel of this invention is demonstrated in detail. The information display panel of the present invention is an information for displaying information such as an image by moving the display medium by enclosing the display medium between two substrates, at least one of which is transparent, and applying an electric field to the display medium. This is a display panel, which is manufactured by the process illustrated in FIG. 4 and a process not shown here.

As for one substrate (substrate 1), first, as shown in FIG. 4, it is wound around a roll 11 which is a substrate material of a single-wafer substrate (mother substrate) for taking one substrate (substrate 1). A sheet-like continuous substrate (hereinafter referred to as a substrate sheet) 12 is mounted on the production line. The substrate sheet 12 is preferably a flexible resin substrate. In addition, the substrate sheet 12 is provided with an ITO patterning step, a partition formation step, an adhesive placement step on the top of the partition, and an adhesive UV curing step in a previous step (not shown), and the adhesive layer on the top of the partition is tack-free. It shall be converted into. The term “tack-free” as used herein refers to a state in which there is no adhesiveness as it is while having an adhesive function.
Next, in the display medium filling step shown in FIG. 4, a predetermined amount of the display medium is filled in each cell formed of the partition walls formed in the panel formation region on the substrate sheet 12, and then the display medium removal shown in FIG. In the process, an unnecessary display medium on the partition is removed by the removing roll 13. Next, in the cutting process shown in FIG. 4, the substrate sheet 12 is cut into single sheets by the cutter 14 to form a single-wafer substrate 15 for taking multiple substrates (in the illustrated example, four sheets). A continuous sheet in which partition walls and electrodes are formed in advance can be wound around the roll 11 and used. Alternatively, the sheet is pulled out from the roll 11 in which only the sheet is wound, and before the display medium filling process, the partition formation process and the electrodes are performed. A forming step can also be provided. In this case, the order of the partition wall forming step and the electrode forming step can be appropriately changed depending on the information display panel to be manufactured. Furthermore, in the present invention, an adhesive layer forming step is provided before the display medium filling step.

  With respect to the other substrate (substrate 2), a substrate sheet 12 which is a flexible resin substrate is used, and the substrate 2 produced by the same process as the single-wafer substrate 15 for multi-sided substrate 1 is manufactured. A sheet substrate 16 for chamfering is used. When the single-wafer substrate 16 is manufactured, the substrate sheet 12 can be provided with a partition wall forming process, a display medium filling process, and a display medium removing process. It is also possible to provide a sealing adhesive arranging step for arranging the sealing agent at the position. Thereafter, the same cutting process as described above is entered. As shown in FIG. 4, the produced single-wafer substrate 16 is placed on a tray and stocked at a predetermined position so that the adhesive placement surface is on the top, and is used by being inverted upside down at the time of bonding. The single-wafer substrate 16 serves as a single-wafer substrate for taking multiple substrates 2 (four in the illustrated example).

  Next, as shown in FIG. 4, in the decompression chamber 17, the single-wafer substrate 15 for multi-sided substrate 1 and the single-wafer substrate 16 for multi-sided substrate 2 are bonded together under a predetermined reduced pressure. A bonding process is performed. This bonding step includes a sealing agent curing step of curing the sealing agent by performing, for example, a reduced pressure UV press. With the bonding step, the sealing agent can be cured by the sealing agent curing step while the two single wafer substrates are bonded together, and only the adhesive at the seal portion can be temporarily cured to the extent that air does not flow in.

Next, as shown in FIG. 4, the two single-wafer substrates that have been bonded and cured with the sealant are moved to the outside of the decompression chamber 17, and the adhesive is fully cured under atmospheric pressure. The adhesive is cured to bond the single substrates.
The sealing agent and the adhesive used in the sealing agent curing step and the adhesive curing step are those belonging to curing systems having different curing rates, for example, a sealing agent having a fast curing rate in the sealing agent curing step. (For example, a UV curable sealant) is used, and an adhesive having a slow curing rate (for example, a thermosetting adhesive) is used in the adhesive curing step.

Thereafter, an information display panel composed of the substrate 1 and the substrate 2 is cut out one by one from one obtained by bonding two single-wafer substrates by a panel cutting process (not shown). Thus, the information display panel of the present invention is manufactured.
In addition, the order of each process other than the bonding process including the said sealing agent hardening process and the said adhesive agent hardening process is not limited above, The order can be changed as needed.

According to the method for manufacturing an information display panel of the present invention, the sealing agent curing step for curing the sealing agent disposed on the substrate 2 and the adhesive curing step for curing the adhesive disposed on the substrate 1 are separate steps. Therefore, the time required for the adhesive curing process is shortened by performing only the sealant curing process in a short time in a reduced pressure state by the decompression chamber 17 and making the time-consuming adhesive curing process as a separate process under atmospheric pressure. Thus, while improving the productivity, the pressure between the substrate 1 and the substrate 2 can be reduced to prevent the remaining gas such as air from remaining. Therefore, it is possible to provide a method for manufacturing an information display panel that achieves both prevention of residual air between substrates and improvement in productivity.
Moreover, since the information display panel of the present invention is produced with high productivity using the method for manufacturing the information display panel of the present invention, it is possible to prevent air remaining between the substrates and improve productivity. This is an information display panel that balances

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

  As for 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 a material having high visible light transmittance and good heat resistance is suitable. A resin substrate having properties is particularly suitable. The rear substrate as the other substrate may be transparent or opaque, but a flexible resin substrate such as a film substrate is preferable. Examples of substrate materials include polymer sheets such as polyethylene terephthalate, polyethylene naphthalate, polyethersulfone, polyethylene, polycarbonate, polyimide, and acrylic, flexible materials such as metal sheets, and glass and quartz. An inorganic sheet having no flexibility is mentioned. 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 for electrodes provided as necessary include metals such as aluminum, silver, nickel, copper, and gold, conductive metal oxides such as ITO, indium oxide, conductive tin oxide, and conductive zinc oxide, polyaniline , Conductive polymers such as polypyrrole and polythiophene are exemplified, and 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 shape of the partition walls 4 provided on the substrate as required is appropriately set appropriately depending on the type of display medium involved in display, the shape and arrangement of electrodes to be arranged, and is not limited in general. The height of the partition is adjusted to 100 to 100 μm, preferably 3 to 50 μm, and the height of the partition wall to 10 to 100 μm, preferably 10 to 50 μm.
In forming the partition wall, a both-rib method in which ribs are formed on each of the opposing substrates 1 and 2 and then bonded, and a single-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. 5, the cells formed by the partition walls made up of these ribs are illustrated in 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 display becomes clearer.
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. Any of these methods can be suitably used for the information display panel of the present invention, and among these, a photolithography method using a resist film and a mold transfer method are suitably 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 used in the information display panel 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 exhibiting high fluidity in an aerosol state in which solid particles are stably suspended as a dispersoid, for example, in a gas, between opposed substrates, at least one of which is transparent. In addition, such a powder fluid can be easily and stably moved by a Coulomb force or the like with a small electric field.
As described above, the pulverized fluid used in the present invention is a substance in the intermediate state of both fluid and particle characteristics that exhibits fluidity by itself without borrowing the force of gas or liquid. This powder fluid can be in an aerosol state in particular, and in the information display panel of the present invention, it is used as a display medium in a state where a solid substance floats relatively stably 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.

  The particles for display media of the present invention (hereinafter also referred to as particles) 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 display medium.

Furthermore, in the present invention, regarding the particle size distribution of each particle, the particle size distribution Span represented by the following formula is 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 expressing 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 diameter of 90% or less.)
By keeping Span within a range of 5 or less, the size of each particle is uniform, and uniform display medium movement becomes 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, put particles into a nitrogen stream and use the attached analysis software (software based on volume-based distribution using Mie theory). The diameter and particle size distribution can be measured.

Furthermore, when applying a display medium such as a particle group composed of particles for a display medium or a powdered fluid to a dry information display panel, it is important to manage the gas in the void surrounding the display medium between the substrates, Contributes to improved display stability. Specifically, it is important that the relative humidity at 25 ° C. is 60% RH or less, and preferably 50% RH or less for the humidity of the gas in the gap.
1A, 1B, 3A, and 3B, the gaps are defined as electrodes 5 and 6 (electrodes inside the substrate) from the portion sandwiched between the opposing substrate 1 and substrate 2. 2), an occupied portion of the display medium 3, an occupied portion of the partition wall 4 (when a partition wall is provided), and a gas portion in contact with a so-called display medium excluding a seal portion of the information display panel.
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 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 that is the subject 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.

  The information display panel produced by the method for manufacturing the information display panel of the present invention has no image unevenness, and is a display device of a mobile device such as a notebook computer, PDA, mobile phone, or handy terminal, an electronic book, an electronic newspaper, or the like. Paper, signboards, posters, blackboards and other bulletin boards, calculators, home appliances, automotive supplies, card displays, point cards, IC cards, card displays, electronic advertisements, electronic POPs, electronic shelf labels, electronic price tags, electronic scores, It is suitably used for a display unit of an RF-ID device.

(A), (b) is a figure which shows an example of the information display panel 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 a figure for demonstrating an example of the manufacturing method of the information display panel of this invention. It is a figure which shows an example of the shape of the partition in the information display panel used as the object of this invention.

Explanation of symbols

1, 2 Substrate 3 Display medium (particle group, powder fluid)
3W White display medium 3B Black display medium 3Wa White display medium particles 3Ba Black display medium particles 4 Bulkhead 5 Electrode 6 Electrode 11 Roll 12 Substrate sheet 13 Removal roll 14 Cutter 15 Single substrate 16 Single substrate 17 Depressurization chamber

Claims (5)

A method of manufacturing an information display panel that displays information such as an image by moving a display medium by enclosing the display medium between two substrates transparent at least one and applying an electric field to the display medium. ,
An information display panel comprising: a sealing agent curing step for curing a sealing agent disposed on at least one substrate; and an adhesive curing step for curing an adhesive disposed on at least one substrate. Production method.   2. The method for manufacturing an information display panel according to claim 1, wherein a sealing agent having a high curing rate is used in the sealing agent curing step, and an adhesive having a slow curing rate is used in the adhesive curing step.   The method for manufacturing an information display panel according to claim 1, wherein the sealing agent curing step is performed under a predetermined reduced pressure, and then the main curing of the adhesive is performed by the adhesive curing step.   The method for manufacturing an information display panel according to any one of claims 1 to 3, wherein the two substrates are formed from a sheet-like continuous substrate wound around a roll.   An information display panel manufactured using the method for manufacturing an information display panel according to claim 1.

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