JP2007212856A - Manufacturing method for panel for information display and panel for information display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for a panel for information display that prevents the panel after sticking from warping or twisting by equalizing deformation conditions of two film substrates used as upper and lower substrates. <P>SOLUTION: In the manufacturing method for the panel for information display which has a display medium charged between the two substrates 1 and 2 one of which is transparent and displays information of an image etc., by moving the display medium by applying an electric field to the display medium, the panel for information display is manufactured while prevented from warping or twisting owing to a difference in thermal deformation quantity between the two substrates having been stuck together by using substrate sheets 12 which are sheet type continuous substrates wound around rolls as the one substrate (substrate 1) and the other substrate (substrate 2), matching the length and width directions of the substrate sheets 12, and using the substrate sheets 12 of the same material having the same stacked structure. <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 an information display panel having a structure in which two film substrates used as two substrates are bonded to each other is produced, when the film substrate is thermally deformed by heat applied to the film substrate in the panel manufacturing process, When the deformation amount and deformation direction of the film substrate are different, there arises a problem that the information display panel is warped or twisted. In addition, when an information display panel having a structure in which two film substrates used as two substrates are bonded together is used, if two different film substrates are used, the panel manufacturing process and use environment There arises a problem that the information display panel is warped or twisted due to the deformation amount of the two film substrates being different.

It is a first object of the present invention to provide a method for manufacturing an information display panel that prevents warping and twisting of a panel after bonding by matching the deformation conditions of two film substrates used as two substrates. The purpose.
The present invention uses the above method for manufacturing an information display panel to match the deformation conditions of two film substrates used as two substrates, thereby preventing warping and twisting of the panels after bonding. It is a second object to provide a panel for the use.

  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. A method for manufacturing an information display panel that displays information such as images by moving a medium, using a sheet-like continuous substrate wound on a roll as one substrate and the other substrate, The longitudinal direction and the width direction of the continuous substrate used as the substrate and the other substrate are made to coincide with each other.

  Further, as a preferable example of the method for manufacturing the information display panel of the present invention, the one substrate and the continuous substrate used as the other substrate are made of the same material and the same laminated structure, and A continuous substrate used as one substrate and the other substrate may be a resin substrate having flexibility.

  In order to achieve the second object, 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 3.

  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 sheet-like continuous substrate wound around a roll is used as one substrate and the other substrate, and one substrate and the other substrate are used. Since the longitudinal direction and the width direction of the continuous substrates used as are matched, the deformation conditions of the two film substrates used as the two substrates are matched. Therefore, it is possible to provide a method for manufacturing an information display panel that prevents warping and twisting of the panels after bonding.

  According to the information display panel of the present invention having the above-described configuration, deformation of two film substrates used as two substrates using the method for manufacturing an information display panel according to any one of claims 1 to 3. Since it is manufactured by matching the conditions, it becomes an information display panel which prevents warping and twisting of the panel after bonding.

  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. A white display medium 3 </ b> W consisting of a group) is parallel to the substrates 1 and 2 according to an electric field generated by applying a voltage between the electrode 5 provided on the substrate 1 and the electrode 6 provided on the substrate 2. The white display medium 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. ing. 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 a resin substrate having flexibility, and a substrate in which deformation conditions are matched with those of the other substrate (substrate 2), as will be described later. This substrate sheet 12 is subjected to an ITO patterning step, a partition formation step, an electrode formation step (only when necessary), an adhesive application step on the upper portion of the partition, and an adhesive UV curing step in a previous step (not shown). Thus, the adhesive layer above the partition wall is made tack-free.
Next, by carrying out 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, as shown in FIG. By performing the display medium removal process shown, unnecessary display media on the partition walls are removed by the suction roll 13. Next, by carrying out the cutting process shown in FIG. 4, the substrate sheet 12 is cut into single sheets by the cutter 14, and the single substrate 15 for taking the substrate 1 in multiple planes (four in the illustrated example) is obtained. Form.

  With respect to the other substrate (substrate 2), similarly to the substrate 1, the substrate 1 is formed by using a substrate sheet 12 which is a flexible resin substrate and has the same deformation conditions as the one substrate (substrate 1). A single-wafer substrate 16 for multi-surface fabrication of the substrate 2 produced by the same process as the single-wafer substrate 15 for multi-surface fabrication is used. When this single wafer substrate 16 is manufactured, a partition wall forming step, an electrode forming step (only when necessary), an adhesive application step on the upper portion of the partition wall, an adhesive UV curing step, a display medium are produced on the substrate sheet 12. Instead of performing the filling process and the display medium removing process, an electrode forming process (only when necessary) and a seal adhesive application process are performed, and then a cutting process similar to the above is performed. 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-coated surface is up, and is used by being inverted upside down during bonding. The single-wafer substrate 16 serves as a single-wafer substrate for taking multiple substrates 2 (four in the illustrated example).

In order to match the deformation conditions of the substrate sheet 12 for forming the above-described one substrate (substrate 1) and the other substrate (substrate 2), as shown in FIG. It is necessary to match the (MD direction) and the width direction (TD direction). For example, when a PET film, which is a biaxially stretched film, is used as the substrate sheet 12, the longitudinal direction (MD) of the substrate sheet 12 is different because the thermal shrinkage in the longitudinal direction (MD direction) / width direction (TD direction) is different. Direction) and width direction (TD direction) are different, the panel warps and twists. Therefore, by making the longitudinal direction (MD direction) / width direction (TD direction) of the substrate sheet 12 coincide, Warping and twisting of the panels after alignment can be prevented. Moreover, the amount of thermal deformation after bonding can be further reduced by aligning the thermal history received by the substrate sheet 12 in the manufacturing process.
Furthermore, the same material is used as each substrate sheet 12, and when a substrate sheet having a multilayer structure such as an HC layer (hard coat layer) or a barrier layer is used, the same sheet structure is used. Is preferred. When substrate sheets of the same material and the same laminated structure are used, since the thermal deformation amounts of the two substrates match, the warp or twist of the panel due to the difference in the thermal deformation amounts of the two substrates after bonding. Can be prevented.

  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, for example, a sealing agent curing step in which the sealing agent is cured by performing a reduced-pressure UV press, and becomes the other substrate on the top of the sheet substrate 15 in which the display medium is filled in the cell. The display medium is sealed in the cell by stacking the single-wafer substrates 16 with the adhesive application surface facing down, and bonding the two together and then curing the sealant.

Next, as shown in FIG. 4, the two single-wafer substrates that have been bonded and cured with the sealant are moved into an autoclave 18 installed outside the decompression chamber 17, and the adhesive is removed under atmospheric pressure. An adhesive curing step is performed in which the two sheets of substrates are cured. This adhesive curing step is performed while heating and pressurizing using the autoclave 18.
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 punching process (not shown). Thus, the information display panel of the present invention is manufactured.
In addition, the order which implement | achieves each said process is not limited above, The order to implement can be changed as needed.

According to the method for manufacturing an information display panel of the present invention, as the substrate 1 and the substrate 2, the substrate sheet 12 which is a continuous substrate in the form of a sheet wound around a roll is used, and the substrate for the substrate 1 and the substrate 2 is used. Since the longitudinal direction (MD direction) and the width direction (TD direction) of the sheet 12 are matched, the deformation conditions of the two substrate sheets 12 are matched. Therefore, it is possible to provide a method for manufacturing an information display panel that prevents warping and twisting of the panels after bonding.
In addition, since the information display panel of the present invention is produced by matching the deformation conditions of the two film substrates used as the two substrates by using the method for manufacturing the information display panel of the present invention, after bonding, This is an information display panel that prevents warping and twisting of the panel.

  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. 6, the cells formed by the partition walls made up 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 plane of the substrate. 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 opposing substrates, at least one of which is transparent. Yes, 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, 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. In other words, the gas portion in contact with the so-called display medium excluding the occupied portion of the display medium 3, the occupied portion of the partition wall 4, and the seal portion of the information display panel is meant.
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.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples of the present invention, but the present invention is not limited to the following.

<Example 1>
HC / PET (75 μm) / SiO ₂ (barrier layer) / ITO having the same laminated structure is used as the substrate sheet 12 for forming the substrate 2 (upper substrate; viewing side) and the substrate 1 (lower substrate), respectively. The information display panel of Example 1 was manufactured by the manufacturing method shown in FIG.
When this information display panel was subjected to a heat resistance test at 100 ° C., almost no deformation of the panel was observed.

<Comparative Example 1>
As the substrate sheet 12 that forms the substrate 2 (upper substrate; viewing side), HC / PET (75 μm) / SiO ₂ (barrier layer) / ITO is used, and as the substrate sheet 12 that forms the substrate 1 (lower substrate), Using HC / PET (125 μm) / SiO ₂ (barrier layer) / ITO, (a) the longitudinal direction (MD direction) and the width direction (TD direction) of each substrate sheet 12 are matched, and (b) each The information display panels (a) and (b) of Comparative Example 1 were manufactured by the manufacturing method shown in FIG. 4 while varying the longitudinal direction (MD direction) and the width direction (TD direction) of the substrate sheet 12.
When a heat resistance test at 100 ° C. was performed on these information display panels (a) and (b), the panel was deformed (warped).

<Comparative example 2>
As the substrate sheet 12 that forms the substrate 2 (upper substrate; viewing side), HC / PET (75 μm) / SiO ₂ (barrier layer) / ITO is used, and as the substrate sheet 12 that forms the substrate 1 (lower substrate), Using PET (75 μm) / SiO ₂ (barrier layer) / ITO, (c) the longitudinal direction (MD direction) and the width direction (TD direction) of each substrate sheet 12 are matched, and (d) each substrate. By changing the longitudinal direction (MD direction) and the width direction (TD direction) of the sheet 12, the information display panels (c) and (d) of Comparative Example 2 were manufactured by the manufacturing method shown in FIG.
When a heat resistance test at 100 ° C. was performed on these information display panels (c) and (d), deformation (warpage) of the panel was observed.

<Comparative Example 3>
HC / PET (75 μm) / SiO ₂ (barrier layer) / ITO having the same laminated structure is used as the substrate sheet 12 for forming the substrate 2 (upper substrate; viewing side) and the substrate 1 (lower substrate), respectively. An information display panel of Comparative Example 3 was manufactured by the manufacturing method shown in FIG. 4 by arranging the substrate sheet 12 so that the longitudinal direction (MD direction) and the width direction (TD direction) were reversed.
When this information display panel was subjected to a heat resistance test at 100 ° C., the panel was deformed (warped).

  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 for demonstrating the method to match the longitudinal direction and width direction of the board | substrate sheet | seat used as one board | substrate and the other board | substrate in 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 particle 3Ba Black display medium particle 4 Bulkhead 5 Electrode 6 Electrode 11 Roll 12 Substrate sheet 13 Adsorption roll 14 Cutter 15 Single substrate 16 Single substrate 17 Decompression chamber 18 Autoclave

Claims (4)

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. ,
As one substrate and the other substrate, a sheet-like continuous substrate wound around a roll is used, and the longitudinal direction and the width direction of the continuous substrate used as one substrate and the other substrate are matched. A method for manufacturing an information display panel   2. The method for manufacturing an information display panel according to claim 1, wherein the one substrate and the continuous substrate used as the other substrate are made of the same material and the same laminated structure.   3. The method for manufacturing an information display panel according to claim 1, wherein the one substrate and the continuous substrate used as the other substrate are resin substrates having flexibility.   An information display panel manufactured using the method for manufacturing an information display panel according to claim 1.

Images