JP2007193182A - Information display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To appropriately perform color display in an information display panel for displaying information on images etc., by applying electric fields to electrodes on two substrates thereby moving display media. <P>SOLUTION: The information display panel displays the information on the images etc. by moving display media by applying the electric fields by the electrodes provided on a black plate of a back substrate and another electrodes to the white display media sealed into the aerial spaces in a plurality of the cells partitioned by partition walls of the two substrates. Each pixel is composed of the three cells and the transparent substrate on the display surface side is arranged respectively with transparent color filters being three primary colors for every cell. A black matrix (BM) 13 is provided between a summit section of the partition wall 4 forming the cell 11 in an information display panel displaying information with color and the transparent substrate 2 on the display surface side and another substrate 5 different from the electrode 6 provided on the black plate 7B is provided in the position overlapping the BM. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention provides an electrode provided on a black plate (or white plate) of a back substrate on a white (or black) display medium sealed between a plurality of cell air cavities partitioned by a partition between two substrates. An information display panel for displaying information such as an image by moving a display medium by applying an electric field with another electrode, wherein each pixel is composed of three cells, and a transparent substrate on the display surface side In FIG. 2, a transparent color filter of the three primary colors is separately arranged for each cell, and the information display panel displays information in color.

As a conventional example of an information display panel for displaying information such as an image in color, as shown in FIG. 7, it is enclosed between a plurality of cells 54 inside and outside of the space partitioned by a partition wall 53 between two substrates 51 and 52. Information for displaying information such as an image by moving the display medium 55W by applying an electric field to the white display medium 55W by the electrode 57 and the other electrode 58 provided on the black plate 56B of the back substrate 51. A display panel, each pixel is composed of three cells 54, and transparent color filters 61R, 61G, 61B of three primary colors are arranged for each cell 54 in the transparent substrate 52 on the display surface side, and information There is an information display panel (for example, see Patent Document 1).
International Publication WO2004 / 008239 Pamphlet

  In the information display panel of the conventional example, when the color of the color plate 56 (black plate 56B or white plate) of the back substrate 51 is displayed via the transparent substrate 52 on the display side, the moved display medium 55W is displayed. There is a problem that the color display performed by providing the color filters 61R, 61G, and 61B cannot be suitably performed because it enters the surface field of view.

  The object of the present invention is to solve the above-mentioned problems, and to a white (or black) display medium enclosed between a plurality of cell air cavities partitioned by a partition between two substrates, a black plate ( In an information display panel that displays information such as an image by moving the display medium by applying an electric field between the electrode provided on the white plate and the other electrode, color display is preferably performed. An information display panel that can be used is provided.

  1st Example of the information display panel of this invention is the electrode provided on the black plate of the back substrate in the white display medium enclosed between the several cell air hollows divided by the partition between two board | substrates. And another electrode to display an information such as an image by moving the display medium by applying an electric field, and each pixel is composed of three cells, and is transparent on the display surface side. In an information display panel that arranges transparent color filters of three primary colors for each cell on the substrate and displays information in color, a black matrix is formed between the top of the partition walls forming the cells and the transparent substrate on the display surface side. (BM) is provided, and another electrode different from the electrode provided on the black plate is provided at a position overlapping with the BM.

  In addition, the second embodiment of the information display panel of the present invention is provided on a white plate on the back substrate in a black display medium enclosed between a plurality of cell air cavities partitioned by a partition between two substrates. An information display panel that displays information such as an image by moving a display medium by applying an electric field by another electrode and another electrode, each pixel being composed of three cells, and the display surface side In an information display panel for displaying information in color, a transparent color filter of the three primary colors is arranged for each cell on each transparent substrate, and between the top of the partition walls forming the cells and the transparent substrate on the display surface side. A black matrix (BM) is provided, and another electrode different from the electrode provided on the white plate is provided at a position overlapping the BM.

  Furthermore, the third embodiment of the information display panel according to the present invention is provided on a black plate on the back substrate in a white display medium enclosed between a plurality of cell air cavities partitioned by a partition between two substrates. An information display panel that displays information such as an image by moving a display medium by applying an electric field by another electrode and another electrode, each pixel being composed of three cells, and the display surface side In an information display panel for displaying information in color, a transparent color filter of the three primary colors is arranged for each cell on each transparent substrate, and between the top of the partition walls forming the cells and the transparent substrate on the display surface side. An overlapping portion of adjacent color filters is provided, and another electrode different from the electrode provided on the black plate is provided at a position overlapping the overlapping portion.

  Furthermore, in the fourth embodiment of the information display panel of the present invention, a black display medium sealed between a plurality of cell air cavities partitioned by a partition between two substrates is placed on a white plate on the back substrate. An information display panel for displaying information such as an image by moving a display medium by applying an electric field between an provided electrode and another electrode, wherein each pixel is composed of three cells, and the display surface In the information display panel that displays the information in color by arranging transparent color filters of the three primary colors for each cell on the transparent substrate on the side, between the top of the partition walls forming the cells and the transparent substrate on the display surface side An overlapping portion of adjacent color filters is provided, and another electrode different from the electrode provided on the white plate is provided at a position overlapping the overlapping portion.

  In the present invention, the white display medium (first and third embodiments) (or the black display medium (second and fourth embodiments)) enclosed between a plurality of cell air cavities partitioned by a partition between two substrates is used. An information display panel for displaying information such as an image by moving a display medium by applying an electric field by an electrode provided on a black plate (or white plate) on the back substrate and another electrode. In an information display panel in which each pixel is composed of three cells, and transparent color filters of three primary colors are arranged for each cell on a transparent substrate on the display surface side, and information is displayed in color, (1) cell A black matrix (BM) is provided between the top of the partition wall forming the transparent substrate and the transparent substrate on the display surface side, and on the black plate (first embodiment) or the white plate (second embodiment) at a position overlapping this BM. Setting (2) An overlapping portion of adjacent color filters is provided between the top of the partition wall forming the cell and the transparent substrate on the display surface side. By providing another electrode different from the electrode provided on the black plate (third embodiment) or the white plate (fourth embodiment) at a position overlapping with the overlapping portion, it is possible to perform color display suitably. An information display panel that can be obtained can be obtained.

  In the third and fourth embodiments of the present invention, the number of steps of disposing a black matrix (BM) between adjacent color filters can be reduced, and information that can perform color display more suitably. A display panel can be obtained.

  First, the basic configuration of the information display panel 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 FIG.

  In the example shown in FIG. 1, a display medium 3 (here, a white display medium 3W composed of a group of white particles 3Wa for display medium) having at least an optical reflectance and chargeability composed of at least one kind of particles is shown. ) Is moved in a direction parallel to the substrates 1 and 2 according to the electric field generated by applying a voltage between the electrode 5 provided on the substrate 1 and the transparent electrode 6, and the white display medium 3W is moved to the observer. The white display is performed by visually recognizing the image, or the black plate 7B provided on the substrate 1 is visually recognized by the observer to perform the black display. In FIG. 1, the partition in front is omitted.

  The above description applies in the same manner to the case where the white display medium 3W including the particle group is replaced with the white 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. I can do it. The powder fluid will be described later.

  Hereinafter, the features of the information display panel of the present invention will be described in detail with reference to FIGS. 2 to 5, the same members as those in the example illustrated in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.

  FIG. 2 is a view for explaining a first embodiment of the information display panel of the present invention. In the example shown in FIG. 2, a white display medium 3 </ b> W sealed between a plurality of cells 11 inside and outside of the cells 11 partitioned by a partition wall 4 between two substrates 1 and 2 is provided on a black plate 7 </ b> B of the rear substrate 1. By applying an electric field between the transparent electrode 6 and the other electrode 5, the display medium 3W is moved to display information such as an image, and each pixel is composed of three cells 11, and the display surface side On the transparent substrate 2, transparent color filters 12R, 12G, and 12B of the three primary colors are arranged for each cell 11 to display information such as images in color. Color display is also possible by using C, M, and Y as the three primary colors of the transparent color filter.

  In the information display panel configured as described above, the first embodiment is characterized in that a black matrix (BM) 13 is provided between the top of the partition wall 4 forming the cell 11 and the transparent substrate 2 on the display surface side. This is that another electrode 5 different from the transparent electrode 6 provided on the black plate 7B is provided at a position overlapping with the BM 13. By configuring in this way, in the first embodiment, if the BM 13 does not have the BM 13, the white display medium 3 </ b> W that enters the display surface field of view can be concealed, so that color display can be suitably performed.

  FIG. 3 is a view for explaining a second embodiment of the information display panel of the present invention. In the example shown in FIG. 3, a black display medium 3 </ b> B enclosed between a plurality of cells 11 inside and outside of the cells 11 partitioned by a partition wall 4 between two substrates 1 and 2 is provided on a white plate 7 </ b> W of the rear substrate 1. By applying an electric field by the transparent electrode 6 and the other electrode 5, the display medium 3B is moved to display information such as an image, and each pixel is composed of three cells 11, and the display surface side On the transparent substrate 2, transparent color filters 12R, 12G, and 12B of the three primary colors are arranged for each cell 11 to display information such as images in color. Color display is also possible by using C, M, and Y as the three primary colors of the transparent color filter.

  In the information display panel configured as described above, the second embodiment is characterized in that a black matrix (BM) 13 is provided between the top of the partition wall 4 forming the cell 11 and the transparent substrate 2 on the display surface side. This is that another electrode 5 different from the transparent electrode 6 provided on the white plate 7W is provided at a position overlapping with the BM 13. By configuring in this way, in the second embodiment, if the BM 13 does not have the BM 13, the black display medium 3 </ b> B that enters the display surface field of view can be concealed, so that color display can be suitably performed.

  FIG. 4 is a view for explaining a third embodiment of the information display panel of the present invention. In the example shown in FIG. 4, a white display medium 3 </ b> W enclosed between a plurality of cells 11 inside and outside of the cells 11 partitioned by a partition wall 4 between two substrates 1 and 2 is provided on a black plate 7 </ b> B of the rear substrate 1. By applying an electric field between the transparent electrode 6 and the other electrode 5, the display medium 3W is moved to display information such as an image, and each pixel is composed of three cells 11, and the display surface side On the transparent substrate 2, transparent color filters 12R, 12G, and 12B of the three primary colors are arranged for each cell 11 to display information such as images in color. Color display is also possible by using C, M, and Y as the three primary colors of the transparent color filter.

  In the information display panel having the above-described configuration, the third embodiment is characterized by the overlapping portion (12R) of adjacent color filters between the top of the partition 4 forming the cell 11 and the transparent substrate 2 on the display surface side. Between 12G and 12G, between 12G and 12B, and between 12B and 12R of the adjacent pixel (this is an example and varies depending on the configuration of the color filter), and the black plate is located at a position overlapping this overlapping portion This is that another electrode 5 different from the transparent electrode 6 provided on 7B is provided. With this configuration, in the third embodiment, the overlapping portion (color mixture layer) plays the same role as the BM 13 in the first embodiment and the second embodiment described above, and can perform color display appropriately. . Furthermore, in the third embodiment, the BM 13 can be easily configured with a small number of man-hours.

  FIG. 5 is a view for explaining a fourth embodiment of the information display panel of the present invention. In the example shown in FIG. 5, a black display medium 3 </ b> B enclosed between a plurality of cells 11 inside and outside of the cells 11 partitioned by a partition wall 4 between two substrates 1 and 2 is provided on a white plate 7 </ b> W of the rear substrate 1. By applying an electric field by the transparent electrode 6 and the other electrode 5, the display medium 3B is moved to display information such as an image, and each pixel is composed of three cells 11, and the display surface side On the transparent substrate 2, transparent color filters 12R, 12G, and 12B of the three primary colors are arranged for each cell 11 to display information such as images in color. Color display is also possible by using C, M, and Y as the three primary colors of the transparent color filter.

  In the information display panel having the above-described configuration, the feature of the fourth embodiment is that an overlapping portion (12R) of adjacent color filters between the top of the partition 4 forming the cell 11 and the transparent substrate 2 on the display surface side. Between 12G and 12G, between 12G and 12B, and between 12B and 12R of the adjacent pixel (this is an example and varies depending on the configuration of the color filter), and the white plate is positioned so as to overlap this overlapping portion. This is that another electrode 5 different from the transparent electrode 6 provided on 7W is provided. With this configuration, in the fourth embodiment, the overlapping portion (color mixture layer) plays the same role as the BM 13 in the first and second embodiments described above, and can perform color display appropriately. . Furthermore, in the fourth embodiment, the BM 13 can be easily configured with fewer man-hours.

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

  As for the substrate, at least one substrate is the transparent substrate 2 from which the color of the display medium can be confirmed from the outside of the information display panel, and a material having high visible light transmittance and good heat resistance is preferable. The substrate 1 may be transparent or opaque. Examples of substrate materials include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyethersulfone (PES), polyethylene (PE), polycarbonate (PC), polyimide (PI), acrylic and other polymer sheets, metals Examples thereof include a flexible sheet such as a sheet and a non-flexible inorganic sheet such as glass and quartz. The thickness of the substrate is preferably from 2 to 5000 μm, more preferably from 5 to 2000 μm. If it is too thin, it will be difficult to maintain the strength and the spacing uniformity between the substrates, and if it is thicker than 5000 μm, it will be a thin information display panel. Is inconvenient.

  Electrode forming materials provided on information display panels include metals such as aluminum, silver, nickel, copper, and gold, and conductive metal oxides such as indium tin oxide (ITO), indium oxide, conductive tin oxide, and conductive zinc oxide. Examples thereof include conductive polymers such as substances, polyaniline, polypyrrole, polythiophene and the like, which are appropriately selected and used. As a method for forming an electrode, a method of forming the above-described materials into a thin film by sputtering, vacuum deposition, CVD (chemical vapor deposition), coating, or the like, or mixing a conductive agent with a solvent or a synthetic resin binder. The method of apply | coating is used. The electrode provided on the black or white plate needs to be transparent, but the other electrode need not be transparent. In any case, the above-mentioned material that can be patterned and is electrically conductive 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, thickness, etc. of the other electrode not provided on the black or white plate are the same as those of the electrode provided on the black or white plate 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 4 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, but the width of the partition is 2 to 100 μm, preferably 3 to 50 μm. In addition, the height of the partition wall is adjusted 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 composed of the colored particles for display medium of the present invention will be described. As for the name of the powder fluid used in the information display panel of the present invention, the present applicant has obtained the right of “Electronic Powder Fluid (registered trademark): Registration No. 4636931”.

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

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

The information display panel of the present invention encloses a powder fluid exhibiting high fluidity in an aerosol state in which solid particles are stably suspended as a dispersoid, for example, in a gas, between opposed substrates, at least one of which is transparent. In addition, such a powder fluid can be easily and stably moved by a Coulomb force or the like with a small electric field.
As described above, for example, the powder fluid used as a display medium in the present invention is a substance in an intermediate state between fluid and particles that exhibits fluidity by itself without borrowing the force of gas or liquid. It is. This powder fluid can be in an aerosol state in particular, and in the information display panel of the present invention, 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 colored particles (hereinafter also referred to as particles) constituting the display medium in the information display panel of the present invention will be described. The colored particles for the display medium are composed of the colored particles for the display medium as they are to be used as the display medium, or are combined with other particles to be used as the display medium, or are adjusted, configured to be a powdered fluid, and displayed. It is used as a medium.
The particles can contain a charge control agent, a colorant, an inorganic additive, and the like, as necessary, in the resin as the main component, as necessary. 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 colored particles for display medium of the present invention (hereinafter also referred to as particles) preferably have an average particle diameter d (0.5) in the range of 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. If the average particle diameter d (0.5) is smaller than this range, the cohesive force between the particles becomes too large, which hinders movement as a 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 movement as a uniform display medium 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.

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

  As a result of intensive studies, the present inventors evaluated the range of the appropriate charging characteristic value of colored particles for display media by measuring the charge amount of particles used for the display media using the same carrier particles in the blow-off method. I found out that I can do it.

Furthermore, when applying a display medium such as a particle group or a powdered fluid composed of colored particles for a display medium to the information display panel of the present invention, it is important to manage the gas in the space surrounding the display medium between the substrates. Yes, contributing 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.
In FIG. 1, this void portion refers to electrodes 5 and 6 (when electrodes are exposed inside the substrate), a portion occupied by the display medium 3, and a partition wall 4. A gas portion in contact with a so-called display medium excluding the occupied portion and the seal portion of the information display panel is indicated.
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 50%, more preferably 5 to 40%. If it exceeds 50%, the movement of the display medium is hindered, and if it is less than 5%, the contrast tends to be unclear.

  The information display panel of the present invention is a display unit of a mobile device such as a notebook computer, PDA, mobile phone, or handy terminal, electronic paper such as an electronic book or electronic newspaper, a bulletin board such as a signboard, a poster, or a blackboard, a calculator, or a home appliance. , Display parts for car supplies, card display parts such as point cards, IC cards, electronic advertisements, information boards, electronic POPs (Point Of Presence, Point Of Purchase advertising), electronic price tags, electronic shelf labels, electronic musical scores, RF- It is suitably used for a display unit of an ID device.

It is a figure which shows an example of the information display panel of this invention. It is a figure for demonstrating the 1st Example of the information display panel of this invention. It is a figure for demonstrating the 2nd Example of the information display panel of this invention. It is a figure for demonstrating the 3rd Example of the information display panel of this invention. It is a figure for demonstrating the 4th Example 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 of this invention. It is a figure for demonstrating the problem of the conventional information display panel.

Explanation of symbols

1, 2 Substrate 3 Display medium (particle group, powder fluid)
3W White display medium 3Wa White particles for display medium 3B Black display medium 3Ba Black particles for display medium 4 Bulkhead 5, 6 Electrode 7B Black plate 7W White plate 11 Cell 12R, 12G, 12B Color filter 13 Black matrix (BM)

Claims (4)

  By applying an electric field to the white display medium enclosed between a plurality of cell air cavities partitioned by a partition wall between two substrates by an electrode provided on the black plate of the back substrate and another electrode, An information display panel for displaying information such as an image by moving a display medium, wherein each pixel is composed of three cells, and a transparent color filter of a color that is a primary color for each cell is formed on a transparent substrate on the display surface side. In an information display panel that is arranged separately and displays information in color, a black matrix (BM) is provided between the top of the partition walls forming the cells and the transparent substrate on the display surface side, and a black plate is placed at a position overlapping this BM. An information display panel comprising another electrode different from the electrode provided thereon.   By applying an electric field to the black display medium enclosed between a plurality of cell air cavities partitioned by a partition between two substrates by an electrode provided on the white plate of the back substrate and another electrode, An information display panel for displaying information such as an image by moving a display medium, wherein each pixel is composed of three cells, and a transparent color filter of a color that is a primary color for each cell is formed on a transparent substrate on the display surface side. In an information display panel that is arranged separately and displays information in color, a black matrix (BM) is provided between the top of the partition walls forming the cells and the transparent substrate on the display surface side, and a white plate is placed at the position overlapping this BM. An information display panel comprising another electrode different from the electrode provided thereon.   By applying an electric field to the white display medium enclosed between a plurality of cell air cavities partitioned by a partition wall between two substrates by an electrode provided on the black plate of the back substrate and another electrode, An information display panel for displaying information such as an image by moving a display medium, wherein each pixel is composed of three cells, and a transparent color filter of a color that is a primary color for each cell is formed on a transparent substrate on the display surface side. In an information display panel that is arranged separately and displays information in color, an overlapping portion of adjacent color filters is provided between the top of the partition walls forming the cells and the transparent substrate on the display surface side, and this overlapping portion An information display panel, wherein another electrode different from the electrode provided on the black plate is provided at an overlapping position.   By applying an electric field to the black display medium enclosed between a plurality of cell air cavities partitioned by a partition between two substrates by an electrode provided on the white plate of the back substrate and another electrode, An information display panel for displaying information such as an image by moving a display medium, wherein each pixel is composed of three cells, and a transparent color filter of a color that is a primary color for each cell is formed on a transparent substrate on the display surface side. In an information display panel that is arranged separately and displays information in color, an overlapping portion of adjacent color filters is provided between the top of the partition walls forming the cells and the transparent substrate on the display surface side, and this overlapping portion An information display panel, wherein another electrode different from the electrode provided on the white plate is provided at the overlapping position.

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