WO2007080960A1 - Panneau d’affichage d’informations - Google Patents

Panneau d’affichage d’informations Download PDF

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Publication number
WO2007080960A1
WO2007080960A1 PCT/JP2007/050314 JP2007050314W WO2007080960A1 WO 2007080960 A1 WO2007080960 A1 WO 2007080960A1 JP 2007050314 W JP2007050314 W JP 2007050314W WO 2007080960 A1 WO2007080960 A1 WO 2007080960A1
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WO
WIPO (PCT)
Prior art keywords
black
display medium
white
particles
display panel
Prior art date
Application number
PCT/JP2007/050314
Other languages
English (en)
Japanese (ja)
Inventor
Hirotaka Yamazaki
Kazuya Murata
Gaku Yakushiji
Original Assignee
Bridgestone Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bridgestone Corporation filed Critical Bridgestone Corporation
Priority to JP2007553943A priority Critical patent/JPWO2007080960A1/ja
Publication of WO2007080960A1 publication Critical patent/WO2007080960A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/165—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on translational movement of particles in a fluid under the influence of an applied field
    • G02F1/1675—Constructional details
    • G02F1/1677—Structural association of cells with optical devices, e.g. reflectors or illuminating devices
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/165—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on translational movement of particles in a fluid under the influence of an applied field
    • G02F1/166—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect
    • G02F1/1671—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect involving dry toners
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/165—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on translational movement of particles in a fluid under the influence of an applied field
    • G02F1/1675—Constructional details
    • G02F2001/1678—Constructional details characterised by the composition or particle type

Definitions

  • the present invention provides a black and white two-color display medium having at least one kind of particle force between gas cavities between two opposing substrates, at least one of which is transparent, and having different charging polarities.
  • the present invention relates to an information display panel that displays information by moving a display medium by an electric field that is sealed and generated in a substrate.
  • an information display panel used for electronic paper applications at least one of two or more transparent particles having two or more types of particle force between two opposing substrates transparent to each other is displayed.
  • An information display panel has been proposed in which a medium is enclosed and the display medium is moved by an electric field generated in the substrate to display information (see, for example, a pamphlet of WO / 2003/050606).
  • white and black are often selected as a combination of two colors because of demands such as not being tired and excellent in visibility (for example, Japanese Patent Laid-Open No. 2004-2006). No. 287061).
  • the particles for display media need to have not only whiteness and blackness but also appropriate chargeability to be driven by the force of the electric field generated in the substrate.
  • Appropriate chargeability means that white particles for white display media and black particles for black display media have oppositely charged polarities, and the amount of charge can be easily driven by the force of an electric field. Means that.
  • titanium oxide has the property of making the particles containing it negatively charged.
  • carbon black is electrically conductive, so it is composed of black and white display medium particles.
  • a display medium a display medium having sufficient whiteness, sufficient blackness, and appropriate chargeability could not be obtained.
  • the present invention uses a combination of white particles for a white display medium using an appropriate amount of titanium oxide and black particles for a black display medium using an appropriate amount of carbon black. It is an object to provide an information display panel excellent in display quality, which is composed of a display medium composed of particles for two colors of black and white, which secures blackness, blackness and appropriate chargeability.
  • the first invention of the information display panel of the present invention encloses a black and white two-color display medium having different charging polarities between two opposing air gaps in which at least one of the substrates is transparent.
  • a white and black two-color display medium having different charging polarities a white display medium containing at least white particles containing at least titanium oxide and a charge control agent imparting negative chargeability, and at least carbon
  • a black display medium including at least black particles containing black and a charge control agent imparting a positive chargeability, and a force is constituted.
  • a black and white two-color display medium having different charging polarities is encapsulated between two opposing air gaps in which at least one substrate is transparent.
  • a unit pixel is composed of three cells, and at least the substrate side, which is the display surface side, is a transparent three primary color White particles containing three color filters with colors and two or more black and white display media having different charge polarities, and containing at least titanium oxide and a charge control agent imparting negative chargeability Including at least white A display medium, and is characterized in that it consisted of at least including black color display media black particles containing a charge control agent which imparts at least carbon black and the positive charging property.
  • the titanium oxide contained in the white particles constituting the white display medium having a negatively charged polarity is set to 10 parts by weight or more, and the positively charged polarity.
  • the carbon black contained in the black particles constituting the black display medium may be 0.1 to LO parts by weight.
  • the titanium oxide content is preferably 10 wt%.
  • White particles constituting a white display medium having a sufficient white color and an appropriate negative charge polarity obtained by setting the amount to be at least parts, and the carbon black content is preferably in the range of 0.1 to 10 parts by weight.
  • the two-color display medium having a different charge polarity is composed of sufficiently black and black particles constituting the black display medium having an appropriate positive charge polarity. It is an information display panel with excellent display quality, which is composed of a black and white display medium that guarantees a high degree of blackness and proper chargeability.
  • FIG. 1 (a) and (b) are diagrams showing an example of an information display panel of the present invention.
  • FIG. 2 (a) and (b) are views showing another example of the information display panel of the present invention.
  • FIG. 3 is a view showing still another example of the information display panel of the present invention.
  • FIG. 4 is a view showing still another example of the information display panel of the present invention.
  • FIG. 5 is a diagram showing an example of the shape of a partition wall in the information display panel of the present invention.
  • FIG. 6 is a diagram showing a procedure for measuring the surface potential of the colored particles constituting the particles for display medium used in the information display panel of the present invention.
  • the basic configuration of the information display panel of the present invention will be described.
  • an electric field is applied to a display medium sealed between two opposing substrates.
  • the charged display medium is attracted by the electric field force or Coulomb force, etc., and the display medium changes the moving direction due to the change in electric field direction by switching the potential, thereby displaying information such as images.
  • the display medium can move uniformly and maintain the stability when the display is repeatedly rewritten or when the display information is continuously displayed.
  • the force exerted on the particles composing the display medium is not only the force attracted by the Coulomb force between the particles, but also the electric mirror image force between the electrode and the substrate, intermolecular force, liquid bridging force, gravity, etc. Can be considered.
  • At least one kind of particle force is included in the optical reflection.
  • At least two or more types of display media 3 having different rates and charging characteristics here, a white display medium 3W having a particle group power of 3Wa and a black display medium 3B having a particle group of 3Ba and a black display medium 3B) ) Is moved vertically to the substrate 2 in accordance with the electric field applied from the outside of the substrate 2, and the black display medium 3B is visually recognized by the observer to display black, or the white display medium 3W is observed.
  • a white display is given to the user.
  • FIG. 1 (b) in addition to the example shown in FIG.
  • a partition 4 is provided between the substrates 1 and 2, for example, in the form of a lattice to form a cell.
  • the front partition is omitted.
  • Conductive members can be provided in layers on the inner sides (sides in contact with the display medium) of the two substrates.
  • a conductive metal oxide such as tin-doped indium oxide (ITO), zinc-doped indium oxide (IZO), indium oxide or tin-doped antimony oxide (ATO) is preferably used.
  • At least two or more display media 3 (here, white display media) having different optical reflectivity and charging characteristics that are also configured with at least one particle force.
  • White display medium 3W which is a particle group force of 3Wa
  • black display medium 3B which is a particle group of 3Ba, which is a particle group of 3Ba
  • an electrode 5 provided on substrate 1 and an electrode 6 provided on substrate 2
  • the substrate 2 is moved vertically to make the black display medium 3B visible to the observer to display black, or the white display medium 3W to the observer
  • the white display is made visible.
  • a partition 4 is provided between the substrate 2 and a lattice, for example, to form a cell.
  • the front partition is omitted.
  • the electrodes arranged opposite to each other can be individual electrodes or line electrodes orthogonal to each other. Electrodes that are preferably provided on the inner side of each of the two substrates (the side in contact with the display medium) include tin-doped indium oxide (ITO), zinc-doped indium oxide (IZO), and indium oxide tin.
  • ITO tin-doped indium oxide
  • IZO zinc-doped indium oxide
  • a conductive metal oxide such as doped acid antimony (ATO) is preferably used.
  • the information display panel having the above-described configuration includes a black and white two-color display medium having different charging polarities, and at least an acid titanium and a charge control agent imparting negative chargeability.
  • the white particles constituting the white display medium contain 10 parts by weight or more, preferably 20 parts by weight or more of titanium oxide, and the black particles constituting the black display medium include It is preferable that the carbon black is contained in the range of 0.1 to: LO parts by weight.
  • the amount of titanium oxide contained in the white particles constituting the white display medium is as large as possible.
  • the content exceeds 100 parts by weight. It is difficult to produce a large amount, and it is produced in the range of 10 to: LOO parts by weight.
  • the white particles constituting the white display medium are obtained by the kneading Z pulverization Z classification method, a large amount of titanium oxide can be contained unlike the polymerization method.
  • Those having a content exceeding 100 parts by weight can be prepared, and are prepared in the range of 10 to 500 parts by weight, preferably 50 to 300 parts by weight, and more preferably 100 to 200 parts by weight.
  • a sufficient white color cannot be obtained if the amount of titanium oxide is less than 10 parts by weight.
  • the amount exceeds 500 parts by weight there are problems that the particle strength is lowered and breaks easily, and that kneading is difficult.
  • the black particles constituting the black display medium is 0.1 parts by weight or more, sufficient black can be obtained, but if it is less than 0.1 parts by weight, sufficient black can be obtained. Absent. In addition, if the amount exceeds 10 parts by weight, the conductivity increases and proper positive chargeability cannot be obtained and the particles do not function as display medium particles. Therefore, the black particles have a carbon content in the range of 0.1 to LO parts by weight. Produced.
  • FIGS. 3 to 4 are diagrams for explaining other examples of the information display panel of the present invention.
  • the same members as those shown in FIGS. 1 (a) and 1 (b) and FIGS. 2 (a) and 2 (b) are denoted by the same reference numerals, and the description thereof is omitted.
  • the examples shown in Figs. In the transparent substrate 2 on the display surface side, three primary color filters 12R (red), 12G (corresponding to the cell 11 consisting of the gas space partitioned by the partition 4 are shown. Green) and 12B (blue purple) are provided separately, and one pixel is composed of three cells 11 each provided with color filters 12R, 12G, and 12B, enabling color display.
  • the example shown in FIG. 3 shows an example in which the color filters 12R, 12G, and 12B are provided on the outer surface of the transparent substrate 2.
  • the example shown in FIG. 4 shows an example in which the color filters 12R, 12G, and 12B are provided in contact with the respective electrodes 6.
  • the color display in the present invention can be suitably performed.
  • At least one of the substrates is a transparent substrate capable of confirming the color of the display medium as well as the information display panel outer force, and a material having high visible light transmittance and good heat resistance is preferable.
  • the other substrate can be transparent or opaque.
  • substrate materials include polymer sheets such as polyethylene terephthalate, polyethylene naphthalate, polyethersulfone, polyethylene, polycarbonate, polyimide, and acrylic, flexible materials such as metal sheets, glass, Non-flexible inorganic sheets such as quartz can be mentioned.
  • the thickness of the substrate is 2 to 5000 111 centimeters, and 5 to 2000 / ⁇ ⁇ force S is preferable. If it is too thin, the strength and uniformity of the distance between the substrates will be maintained, from 5000 / zm. Thickness V is inconvenient for thin information display panels.
  • metals such as aluminum, silver, nickel, copper and gold, tin-doped indium oxide ( ITO), zinc-doped indium oxide (IZO), tin-doped antimony oxide (ATo), indium oxide, conductive tin oxide, conductive metal oxides such as conductive zinc oxide, polyline, polypyrrole, polythiophene, etc.
  • Conductive polymers are exemplified and appropriately selected and used.
  • the above-described materials are formed into a thin film by sputtering, vacuum deposition, CVD (chemical vapor deposition), coating, or the like, or a conductive agent is used as a solvent or a synthetic resin binder.
  • the method of mixing and applying to is used.
  • the electrodes and conductive members provided on the display surface side substrate need to be transparent, but the electrodes and conductive members provided on the back side substrate need to be transparent. V, even in case of misalignment
  • the above-mentioned material that can form a turn and is electrically conductive can be suitably used.
  • the thickness of the electrode and the conductive member is 3 to 1 nm, preferably 5 to 400 nm, as long as the conductivity can be secured and the light transmittance is not affected.
  • the material and thickness of the electrode and conductive member provided on the back side substrate are the same as those of the electrode provided on the display surface side substrate described above, but it is not necessary to be transparent. In this case, the external voltage input may be superimposed with direct current or alternating current.
  • the electrode and the conductive member are preferably provided on the inner side (the side in contact with the display medium) of the substrate.
  • the shape of the partition walls 4 provided on the substrate as necessary is appropriately set according to the type of display medium involved in the display, and is not limited in general, but the width of the partition walls is 2 to: LOO ⁇ m, Preferably, the height of the partition wall is adjusted to 3 to 50 ⁇ m, and the height of the partition wall is adjusted to 10 to 500 ⁇ m, preferably 10 to 200 ⁇ m.
  • a double rib method in which ribs are formed on both opposing substrates 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.
  • the cells formed by the partition walls having these rib forces 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 as shown in FIG.
  • Examples of the child shape include a honeycomb shape and a mesh shape. Display side force It is better to make the part corresponding to the visible section of the partition wall (the area of the cell frame) as small as possible.
  • 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 photolithographic method using a resist film or a mold transfer method is preferably used.
  • 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.
  • a liquid crystal is defined as an intermediate phase between a liquid and a solid, and has fluidity that is a characteristic of a liquid and anisotropy (optical properties) that is a characteristic of a solid (Heibonsha: Large Encyclopedia). ).
  • anisotropy optical properties
  • the definition of a particle is an object with a finite mass even if it is negligible. (Maruzen: Physics Encyclopedia).
  • gas-solid fluidized bed 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. When it balances with gravity, it is called a gas-solid fluidized bed that is in a state where it can easily flow like a fluid, and a state fluidized by the same fluid is called a liquid-solid fluid. (Heibonsha: Encyclopedia). As described above, the gas-solid fluidized bed body and the liquid-solid fluid body are in a state using a flow of gas or liquid. In the present invention, it has been found that a substance in a state of fluidity can be created specifically without borrowing the force of such gas and liquid, and this is defined as powder fluid.
  • the pulverulent fluid in the present invention is an intermediate state having both the characteristics of particles and liquid, as in the definition of liquid crystal (intermediate phase between liquid and solid), and has the characteristics of the particles described above. It is a substance that shows a unique state with high fluidity that is extremely difficult to be affected by gravity. Such a substance can be obtained in an aerosol state, that is, a dispersion system in which a solid or liquid substance is stably suspended as a dispersoid in a gas.
  • the information display panel of the present invention can obtain a solid substance as a dispersoid. It is what.
  • the information display panel of the present invention has high fluidity in an aerosol state in which solid particles are stably suspended as a dispersoid, for example, in a gas as a display medium between opposing substrates, at least one of which is transparent.
  • This kind of powder fluid is so fluid that the angle of repose, which is an index indicating the fluidity of the powder, cannot be measured. Therefore, it can be easily and stably moved.
  • the powder fluid used as the display medium in the present invention is an intermediate state of both fluid and particle characteristics that exhibit fluidity by themselves without borrowing the force of gas or liquid. It is a substance.
  • This powder fluid can be in an aerosol state in particular, and the information display panel of the present invention is used in a state where a solid substance floats relatively stably as a dispersoid in the gas.
  • the colored particles for display medium may be composed of colored particles as they are to form a display medium, or may be combined with other particles to form a display medium, or may be adjusted and configured to become a powder fluid to form a display medium.
  • the display medium particles of the present invention may be white particles having a negative charge polarity and black particles having a positive charge polarity.
  • the display medium is preferably configured as particles having a spherical shape and a small specific gravity.
  • a method for charging the particles for display medium positively or negatively is not particularly limited, and a charging method such as a corona discharge method, an electrode injection method, a friction method or the like is used.
  • the charge amount measured by the blow-off method using the same carrier is 5 to 150 CZg in absolute value.
  • the difference is preferably 5 to 150 C / g in absolute value. Absolute value of charge amount and absolute value force of charge difference S If the value is smaller than this range, the response speed to electric field changes will be slow, and the memory performance will be low.
  • the present inventors measured the charge amount of particles used for a display medium by using the same carrier particles in the blow-off method, and thus the range of the appropriate charging characteristic value of the particles for display medium.
  • the amount of charge was measured by the following: o
  • a mixture of display medium particles and carrier particles is placed in a cylindrical container with nets at both ends, and high-pressure gas is blown at one end to separate display medium particles and carrier particles. Opening force Blow off only the particles for the display medium. At this time, the charge amount equivalent to the charge amount of the display medium particles taken away from the container remains in the carrier particles. All the electric flux due to this charge is collected by the Faraday cage, and the capacitor is charged by this amount. Therefore, by measuring the potential across the capacitor, the charge quantity Q of the particles for the display medium is
  • the carrier carrier particles are used to measure the charge amount of the particles for the display medium to be measured.
  • the display that constitutes each display medium Use the same type of carrier particles when measuring the charge of the media particles.
  • the charge amount ( ⁇ C / g) of the particles was measured using DFC100 wrinkle (Mn-Mg-containing ferrite system) manufactured by Dowa Iron Powder Co., Ltd. as carrier particles.
  • the volume resistivity is 1
  • X 10 10 ⁇ 'cm or more insulating particles preferably tool particularly volume resistivity 1 X 10 12 ⁇ -cm or more insulating particles are preferred. Further, particles with slow charge decay evaluated by the method described below are more preferable.
  • a display medium particle to be measured is arranged on the surface of a roll-shaped measurement jig, and a voltage of 8 KV is applied to a corona discharger arranged at a distance of 1 mm from the arranged display medium particle surface. Is applied to generate a corona discharge to charge the particle surface for display medium, and the change in the surface potential is measured and judged. In this case, it is important to select and prepare the display medium particle constituent material so that the maximum value of the surface potential after 0.3 seconds is larger than 300V, preferably larger than 400V.
  • the surface potential can be measured, for example, with the apparatus shown in FIG. 6 (CRT2000 manufactured by QEA).
  • CRT2000 manufactured by QEA
  • the both ends of the shaft of the roll-shaped measuring jig with the display medium particles to be measured arranged on the surface are held by the chuck 21, and a small scorotron discharger 22 and a surface potential meter 23
  • the measurement unit is placed in a roll shape with the measurement unit placed at a predetermined distance from the surface of the particles for the display medium to be measured with an interval of lmm.
  • a method of measuring the surface potential of the display medium particles disposed on the surface of the measurement jig while applying surface charge by moving the particles to the other end at a constant speed is suitably employed.
  • the measurement environment shall be a temperature of 25 ⁇ 3 ° C and a humidity of 55 ⁇ 5RH%.
  • the display medium particles may be composed of any material as long as the whiteness, blackness, charging performance, and the like are satisfied.
  • it can be formed from a resin, a charge control agent, a colorant, an inorganic additive and the like.
  • particles for display media the glass transition of the resin constituting the particles. It is preferable to use one having a transition temperature Tg of 60 ° C or higher.
  • the particles for white display medium contain, in addition to the main component resin, titanium oxide, a charge control agent imparting negative chargeability, another charge control agent, another colorant, an inorganic additive, and the like. I can do it.
  • Particles for black display media contain carbon black, a charge control agent that imparts positive chargeability to the main resin, and other charge control agents, other colorants, inorganic additives, etc. be able to. Examples of the resin, charge control agent, colorant, and other additives are given below.
  • the resin examples include urethane resin, urea resin, acrylic resin, polyester resin, acrylic urethane resin, acrylic urethane silicone resin, acrylic urethane fluorine resin, acrylic fluorine resin, Silicone resin, acrylic silicone resin, epoxy resin, polystyrene resin, styrene acrylic resin, polyolefin resin, petital resin, vinylidene chloride resin, melamine resin, phenol resin, fluorine resin, polycarbonate resin Examples thereof include fat, polysulfone resin, polyether resin, polyamide resin, and the like, and two or more kinds can be mixed. In particular, from the viewpoint of controlling the adhesion to the substrate, acrylic urethane resin, acrylic silicone resin, acrylic fluorine resin, acrylic urethane silicone resin, acrylic urethane fluorine resin, fluorine resin, silicone resin Is preferred.
  • styrene derivatives such as styrene, a-methylol styrene, p-chlorostyrene, chloromethylstyrene; chlor chloride; butyl esters such as butyl acetate and butyl propionate; unsaturated-tolyls such as acrylonitrile; Methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, stearyl (meth) acrylate, ethylene glycol (meth) acrylate, triflu It is obtained by polymerizing polymerizable monomers such as (meth) acrylate derivatives such as oloethyl (meth) acrylate, pentafluoropropyl (meth) acrylate and cyclohexyl (meth) acrylate.
  • examples include fats.
  • crosslinkable monomers include divinylbenzene, dibibiphenyl, dibinaphthalene, polyethylene glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meta ) Atalylate, trimethylolpropane tri (meth) atalylate, tetramethylol methanetri (meth) a Thallate, tetramethylolpropane tetra (meth) acrylate, diaryl phthalate and its isomers, dibutyl ether, diethylene glycol methacrylate, ethylene glycol dimethacrylate, polyethylene glycol dimethacrylate, diaryl phthalate, etc.
  • Crosslinkable monomers such as triallyl iso
  • a highly crosslinked resinous force obtained by polymerizing a monomer mixture containing the crosslinkable monomer is also obtained.
  • a highly crosslinkable rosin is used, sufficient mechanical performance can be maintained even if it contains a large amount of titanium oxide as described above.
  • the charge control agent is not particularly limited, but examples of the negative charge control agent include oil-soluble salicylic acid metal complexes, metal-containing azo dyes, and metal-containing (including metal ions and metal atoms). Examples include dyes, quaternary ammonium salt compounds, force-rich allenic compounds, boron-containing compounds (benzyl acid boron complexes), and nitroimidazole derivatives, which affect the whiteness of particles for white display media. Those not used are preferably used. Examples of the positive charge control agent include Niguchicin dyes, triphenylmethane compounds, quaternary ammonium salt compounds, polyamine resins and imidazole derivatives.
  • ultrafine silica metal oxides such as ultrafine titanium oxide and ultrafine alumina, nitrogen-containing cyclic compounds such as pyridine and derivatives and salts thereof, various organic pigments, rosin containing fluorine, chlorine, nitrogen, etc. Can also be used as a charge control agent.
  • Carbon black is used as the black colorant.
  • titanium oxide is used as the white colorant.
  • the display medium particles of the present invention preferably have a mean particle diameter d (0.5) force in the range of 1 to 20 ⁇ m, and are uniform and uniform. If the average particle diameter d (0.5) is larger than this range, the display is not clear. If the average particle diameter d (0.5) is smaller than this range, the cohesive force between particles becomes too large, which hinders movement as a display medium. Become.
  • 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 expressed in m that the particle size is 50% larger than this and 50% smaller than this, and d (0.1) is a particle whose ratio is 10% or less. The diameter is expressed as / zm, and d (0.9) is the numerical value when the particle diameter is 90% or less, and is expressed as / zm.) By keeping Span within 5 or less, They are uniform in size and can be moved as a uniform display medium.
  • the ratio of d (0.5) of the particles having the minimum diameter to d (0.5) of the particles having the maximum diameter among the particles for display medium used is 50 or less. It is important to set it to 10 or less. Even if the particle size distribution Span is reduced, particles for display media with different charging characteristics move in opposite directions, so that the particle sizes are close to each other, and each particle can easily move in the opposite direction by the equivalent amount. This is the preferred range, and this is the range.
  • the particle size distribution and the particle size described above can be obtained from a laser diffraction Z scattering method or the like.
  • laser light is irradiated onto the display medium particles to be measured, a light intensity distribution pattern of diffracted Z-scattered light is generated spatially, and this light intensity pattern has a corresponding relationship with the particle diameter. Distribution can be measured.
  • 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, the particles are put 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.
  • Mastersizer2000 Malvern Instruments Ltd.
  • the charge amount of the display medium particles naturally depends on the measurement conditions, the charge amount of the display medium particles in the information display panel is almost the initial charge amount, the contact with the partition, the contact with the substrate, It turned out that it depends on the charge decay with the elapsed time, and in particular the saturation value of the charging behavior of the particles for the display medium is the dominant factor.
  • the relative humidity at 25 ° C is 60% RH or less, preferably 50% RH or less for the gas humidity in the voids.
  • These voids are the opposing substrate 1 and substrate 2 in FIGS. 1 (a) and 1 (b) to 2 (a) and 2 (b). From the portion sandwiched between the electrodes 5, 6 (when electrodes are provided inside the substrate), the occupied area of the display medium (particle group or powdered fluid) 3, the occupied area of the partition 4 (when the partition is provided), information Except for the seal part of the display panel, V, and the gas part in contact with the so-called display medium.
  • 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 suitable.
  • This gas must be sealed in the information display panel so that the humidity is maintained. For example, filling of the display medium and assembly of the information display panel are performed in a predetermined humidity environment. It is important to use sealing materials and sealing methods that prevent external forces from entering the humidity.
  • 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 500 111, preferably 10 to 200 / ⁇ ⁇ .
  • the volume occupation ratio of the display medium in the gas space between the opposing substrates is preferably 5 to 70%, and more preferably 5 to 60%. If it exceeds 70%, the movement of the display medium is hindered, and if it is less than 5%, the contrast tends to be unclear.
  • white particles for negatively charged white display media 10 parts by weight of titanium oxide (Typeta CR-50: manufactured by Ishihara Sangyo), 95 mol% of styrene monomer (Kanto Chemical Reagent) and 5 mol% of methacrylic acid (Kanto Chemical Reagent)
  • Ti oxide Typeta CR-50: manufactured by Ishihara Sangyo
  • Kanto Chemical Reagent 95 mol% of styrene monomer
  • methacrylic acid Karlo Chemical Reagent
  • the Tg (glass transition temperature) of styrene resin is 92 ° C
  • the Tg (glass transition temperature) of methacrylic acid resin is 130 ° C.
  • the whiteness of the obtained particles was measured with an image densitometer (RD918: manufactured by Darretag Macbeth). As a result, the optical density was 0.08, which was sufficient as whiteness.
  • white particles having an average particle diameter of 9. O / zm were obtained using a classifier (MDS-2: Nippon-Umetic Kogyo).
  • the obtained particles had a charge of 90 / z CZg, and the maximum value of the surface potential after 0.3 seconds of the surface potential measurement was 430V.
  • a white display medium was constituted by the group of white particles.
  • O / zm were obtained.
  • the charge amount of the obtained particles was 110 CZg, and the maximum value of the surface potential after 420 seconds of the surface potential measurement was 420V.
  • a white display medium was composed of a group of white particles.
  • Titanium oxide made by Ishihara Sangyo Co., Ltd., trade name: CR60-2
  • phenolic condensate as a negative charge control agent (Bontron E89: manufactured by Orienti Engineering) and 5 parts by weight of Henschel-type mixer (FM50) '1 Mitsui Mining Co., Ltd.) and the resulting mixture was kneaded / granulated with a twin-screw extruder (KZW 15-45MG Technobel Co., Ltd.), pelletized,
  • the mixture was pulverized / classified using a Podget Mill Japan-Eumatic Co., Ltd. to obtain white particles having an average particle size of 8.7 ⁇ m.
  • the charge amount of the obtained particles was 93 ⁇ CZg, and the maximum value of the surface potential after 0.3 seconds of the surface potential measurement was 440V.
  • a white display medium was composed of a group of white particles. When the whiteness of the obtained particles was measured with an image densitometer (RD918: manufactured by Darretag Macbeth Co., Ltd.), the optical density was 0.07, which was sufficient as white.
  • white particles for negatively charged white display media 5 parts by weight of oxyhititanium (Typeta CR-50, manufactured by Ishihara Sangyo), 95 mol% of styrene monomer (Kanto Chemical Reagent) and 5 mol% of methacrylic acid (Kanto Chemical Reagent)
  • oxyhititanium Typeta CR-50, manufactured by Ishihara Sangyo
  • styrene monomer Kanto Chemical Reagent
  • methacrylic acid Karlo Chemical Reagent
  • a negatively chargeable charge control agent a negatively chargeable charge control agent
  • a phenolic condensate (Bontron E89: manufactured by Orient Chemical Co., Ltd.)
  • 5 parts by weight 5 parts by weight
  • 2 parts by weight of lauryl peroxide Perroll L: manufactured by Nippon Oil & Fats
  • Latemul E-1 18B manufactured by Kao
  • MDS-2 Nihon-Eumatic Kogyo
  • white particles having an average particle size of 9. were obtained.
  • the charge amount of the obtained particles was 37 CZg, and the maximum value of the surface potential after 420 seconds of the surface potential measurement was 420V.
  • the Tg (glass transition temperature) of the resin component of the particles was 98 ° C.
  • the whiteness of these white particles was measured with an image densitometer (RD918: manufactured by Darretag Macbeth Co., Ltd.), resulting in an optical density of 0.1, which was insufficient as whiteness.
  • Titanium oxide made by Ishihara Sangyo Co., Ltd., trade name: CR60-2
  • phenolic condensate as a negatively charged charge control agent (Bontron E89: manufactured by Orienti Engineering) and 5 parts by weight of Henschel type mixer (FM50) '1 Mitsui Mining Co., Ltd.) and the resulting mixture was kneaded / granulated with a twin-screw extruder (KZW 15-45MG Technobel Co., Ltd.), pelletized
  • KZW 15-45MG Technobel Co., Ltd. twin-screw extruder
  • a white particle having an average particle diameter of 8.7 m was obtained by pulverization / classification using a Podget mill (manufactured by Nippon Eumatic Co., Ltd.).
  • an image densitometer RD918: manufactured by Daretag Macbeth
  • the result showed that the optical density was 0.07.
  • black particles for positively charged black display media 98 parts by weight of methyl metatalylate monomer (Kanto Chemical Reagent) and Ataliloylmorpholine (ACMO: manufactured by Kojin Co., Ltd.) are used as a positively charged charge control agent.
  • the charge amount of the obtained particles was +47 ⁇ CZg, and the maximum value of the surface potential after 450 seconds of the surface potential measurement was 450V.
  • the Tg (glass transition temperature) of the rosin component of the particles was 110 ° C.
  • This black particle group Thus, a black display medium was constructed.
  • the Tg (glass transition temperature) of methyl metatalylate resin is 105 ° C
  • the Tg (glass transition temperature) of attalyloylmorpholine resin is 145 ° C.
  • the blackness of the black particles was measured with an image densitometer (RD918: manufactured by Darretag Macbeth), the optical density was 1.3, which was sufficient as blackness.
  • black particles for positively charged black display media 98 parts by weight of methyl metatalylate monomer (Kanto Chemical Reagent) and Ataliloylmorpholine (ACMO: manufactured by Kojin Co., Ltd.) are used as a positively charged charge control agent.
  • the charge amount of the obtained particles could not be measured.
  • the surface potential after 0.3 seconds of the surface potential measurement could not be measured.
  • the Tg (glass transition temperature) of the rosin component of the particles was 110 ° C.
  • a black display medium was constituted by the group of black particles.
  • the Tg (glass transition temperature) of methyl metatalylate resin is 105 ° C
  • the Tg (glass transition temperature) of attalyloylmorpholine resin is 145 ° C.
  • black particles for positively charged black display media 98 parts by weight of methyl metatalylate monomer (Kanto Chemical Reagent) and Ataliloylmorpholine (ACMO: manufactured by Kojin Co., Ltd.) are used as a positively charged charge control agent.
  • the charge amount of the obtained particles was +40 CZg, and the maximum value of the surface potential was 470 V 0.3 seconds after the surface potential measurement.
  • the Tg (glass transition temperature) of the rosin component of the particles was 110 ° C.
  • the display medium was charged by friction charging by mixing and stirring both display media in an equivalent amount.
  • a glass transparent substrate (20cm opening) with line electrodes (width: 300 ⁇ m, line pitch: 340 ⁇ m) on which ITO electrodes are placed is a photosensitive film-dry made by Zigo Morton Cells that fill the display medium by laminating film photoresist NIT250, forming barrier ribs (width: 20 m, height: 50 m) corresponding to the pixel size by exposure and development, and filling the display medium (rectangular, grid-like) Arrangement) was prepared.
  • a glass transparent substrate provided with a copper comb line electrode (width: 300 ⁇ m, line pitch: 340 ⁇ m) was prepared.
  • a white display medium and a black display medium having different charging characteristics were first filled with the white display medium into the cells on the display side substrate provided with the partition walls, and then filled with the black display medium.
  • the filling arrangement amount of both display media was kept the same volume, and the volume occupation ratio of the two display media combined between the two substrates was adjusted to 25 vol%.
  • the other substrate is placed on the substrate in which the display medium is filled and arranged in the cell so that the line-shaped electrodes face each other at right angles, and the outer peripheral portion around the substrate is bonded with an epoxy adhesive. Then, a display medium was sealed and an information display panel was produced.
  • Example 2 and Comparative Example 1 Ten information display panels described in Example 2 and Comparative Example 1 were each manufactured and incorporated in an information display device, and voltage was applied to the electrodes so as to display a solid image and a staggered lattice image. The quality of the displayed image was visually observed and evaluated.
  • Example 1 A combination of the white display medium composed of the white particles produced in Production Example 1 of white particles for white display medium and the black display medium comprised of the black particles produced in Production Example 1 of black particles for black display medium An information display panel was prepared and evaluated according to the above. Table the results
  • a combination of the white display medium composed of the white particles produced in Production Example 3 of white particles for white display medium and the black display medium comprised of the black particles produced in Production Example 2 of black particles for black display medium An information display panel was prepared and evaluated according to the above. Table the results Shown in 1.
  • An information display panel and an information display device using the same include a display unit of an electronic device such as a notebook computer, PDA, mobile phone, handy terminal, electronic book, electronic newspaper, electronic manual (instruction manual). ) And other electronic paper, billboards such as signboards, posters, and blackboards, calculators, home appliances, display parts for automobiles, point cards, smart cards, etc., electronic advertisements, information boards, electronic POP (Point Of Presence, Point Of Purchase advertising), electronic shelf label, electronic price tag, electronic score, display unit of RF-ID device, etc.
  • display of external electric field drive system that rewrites display by electric field drive by external electric field forming means It is suitably used for panels (so-called rewritable paper).

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)

Abstract

La présente invention concerne un panneau d’affichage d’informations offrant une excellente qualité d’affichage. Ledit panneau d’affichage comprend un milieu d’affichage contenant des particules de milieu d’affichage de deux couleurs (noir et blanc) qui assurent le degré de noir et le degré de blanc voulus ainsi qu’une capacité de charge appropriée ; ledit panneau combine l’utilisation de particules blanches (3Wa) contenant une quantité appropriée d’oxyde de titane (pour le milieu d’affichage blanc) et de particules noires (3Ba) contenant une quantité appropriée de noir de carbone (pour le milieu d’affichage noir). Le panneau d’affichage d’informations a une structure telle que les milieux d’affichage de couleur respective noire et blanche, différents l’un de l’autre de par leur polarité de chargement, sont scellés dans un espace rempli de gaz entre deux substrats opposés (1) et (2), l’un au moins desdits substrats étant transparent. Les milieux d’affichage de couleurs respective noire et blanche, différents l’un de l’autre de par leur polarité de chargement, comprennent un milieu d’affichage blanc (3W) comprenant des particules blanches (3Wa) contenant de l’oxyde de titane et un agent de contrôle de la charge conférant une aptitude au chargement négatif, et un milieu d’affichage noir (3B) comprenant des particules noires (3Ba) contenant du noir de carbone et un agent de contrôle de la charge conférant une aptitude au chargement positif. Un tel panneau d’affichage d’informations peut être utilisé dans des applications de journaux électroniques.
PCT/JP2007/050314 2006-01-16 2007-01-12 Panneau d’affichage d’informations WO2007080960A1 (fr)

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KR101202804B1 (ko) 2011-01-26 2012-11-19 한국생산기술연구원 카본블랙을 이용한 전자종이용 입자 외첨제의 제조방법 및 이를 이용하여 제조된 카본블랙을 이용한 전자종이용 입자 외첨제

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JP2004341018A (ja) * 2003-05-13 2004-12-02 Bridgestone Corp 画像表示装置
JP2004341123A (ja) * 2003-05-14 2004-12-02 Bridgestone Corp 画像表示用パネル及び画像表示方法
JP2005164989A (ja) * 2003-12-03 2005-06-23 Bridgestone Corp 薄型画像表示用パネルおよびそれを用いたカード、シート、薄型機器
JP2005234516A (ja) * 2004-01-22 2005-09-02 Bridgestone Corp 画像表示用パネルおよびそれを用いた画像表示装置
JP2005241779A (ja) * 2004-02-25 2005-09-08 Bridgestone Corp 画像表示装置に用いる粒子、粉流体及びそれを用いた画像表示装置
JP2005300831A (ja) * 2004-04-09 2005-10-27 Bridgestone Corp 画像表示用パネル、それに用いる粒子群の組合せ決定方法及び画像表示装置
JP2005321492A (ja) * 2004-05-07 2005-11-17 Bridgestone Corp 画像表示装置の製造方法

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Publication number Priority date Publication date Assignee Title
JP2004317526A (ja) * 2003-02-27 2004-11-11 Bridgestone Corp 画像表示用パネル及び画像表示装置
JP2004341018A (ja) * 2003-05-13 2004-12-02 Bridgestone Corp 画像表示装置
JP2004341123A (ja) * 2003-05-14 2004-12-02 Bridgestone Corp 画像表示用パネル及び画像表示方法
JP2005164989A (ja) * 2003-12-03 2005-06-23 Bridgestone Corp 薄型画像表示用パネルおよびそれを用いたカード、シート、薄型機器
JP2005234516A (ja) * 2004-01-22 2005-09-02 Bridgestone Corp 画像表示用パネルおよびそれを用いた画像表示装置
JP2005241779A (ja) * 2004-02-25 2005-09-08 Bridgestone Corp 画像表示装置に用いる粒子、粉流体及びそれを用いた画像表示装置
JP2005300831A (ja) * 2004-04-09 2005-10-27 Bridgestone Corp 画像表示用パネル、それに用いる粒子群の組合せ決定方法及び画像表示装置
JP2005321492A (ja) * 2004-05-07 2005-11-17 Bridgestone Corp 画像表示装置の製造方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101202804B1 (ko) 2011-01-26 2012-11-19 한국생산기술연구원 카본블랙을 이용한 전자종이용 입자 외첨제의 제조방법 및 이를 이용하여 제조된 카본블랙을 이용한 전자종이용 입자 외첨제

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