JP2007140182A - Panel for information display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a panel for information display which can suitably rewrite information and has excellent display rewriting durability with a low driving voltage. <P>SOLUTION: The panel for information display which displays information of an image etc., by moving display media of two colors, charged in a plurality of in-cell air spaces partitioned with partition walls between two substrates at least one of which is transparent and differing in optical reflectivity and charging characteristic, by applying an electric field to the display media of the two colors from outside is characterized in that a conductive member made of conductive metal oxide or conductive macromolecular material is provided on a substrate surface on a side of contacting the display media in contact with the display media. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention applies an external electric field to a two-color display medium with different optical reflectivity and charging characteristics enclosed between a plurality of cell air cavities partitioned by a partition between at least one transparent substrate. The present invention relates to an information display panel that displays information such as images by moving a display medium of two colors.

Conventionally, there is known a dry type image forming apparatus in which a display medium is sealed in an air space in a cell between substrates, an electric field is applied to the display medium from the outside, and the display medium is driven to display information such as an image. (For example, refer to Patent Document 1). In the conventional image forming apparatus described above, since various components are arranged between the substrates, the outermost surface of the substrate is made of the substrate itself and has an insulating property. FIG. 8 is a diagram for explaining an example of the above-described conventional image forming apparatus. In the example shown in FIG. 8, 51 and 52 are substrates, 53 is a partition, 54B is black particles, and 54W is white particles. The black particles 54 </ b> B and the white particles 54 </ b> W move according to the direction of the electric field applied from the outside, and can display information such as images on the transparent insulating substrate 52 on the display side.
JP 2001-31225 A

  In the image forming apparatus described above, display rewriting is performed by a display rewriting apparatus that applies an electric field from the outside in order to rewrite display information. However, even if display rewriting is performed by the display rewriting apparatus, the display medium (particles) is driven. The displayed information may not be rewritten. In addition, the driving voltage is increased, and the durability of display rewriting is also a problem.

  An object of the present invention is to provide an information display panel which can solve the above-described problems and can suitably rewrite information and has good display rewriting durability with a low driving voltage. is there.

  The information display panel of the present invention is a two-color display medium having different optical reflectivity and charging characteristics enclosed between a plurality of cell air cavities partitioned by a partition between at least one transparent substrate. An information display panel that displays information such as an image by applying an electric field from the outside to move a two-color display medium, and a conductive metal oxide or a conductive high electrode on the substrate surface in contact with the display medium A conductive member made of a molecular material is provided in contact with the display medium.

  Moreover, as a suitable example of the information display panel of the present invention, the conductive member provided on the display surface side is a transparent conductive member, a white display medium and a black display medium are used as the display medium, and the partition is partitioned by a partition wall. There are also cases where three primary color filters are arranged corresponding to cells in the air space and one pixel is composed of three cells.

  According to the present invention, in an information display panel for displaying information such as an image by moving a two-color display medium by applying an electric field from the outside, the conductive metal oxide is formed on the substrate surface in contact with the display medium. Alternatively, by providing a conductive member made of a conductive polymer material so as to be in contact with the display medium, information can be suitably rewritten, and information having good display rewriting durability with a low driving voltage. 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.

  FIG. 1 is a view for explaining the structure of an example of an information display panel according to the present invention. In the example shown in FIG. 1, at least two or more types of display media 3 (here, white display particles composed of particles 3Wa for white display media) having different optical reflectivity and charging characteristics composed of at least one type of particles. The medium 3W and the black display medium 3B composed of particles of the black display medium particles 3Ba) are moved vertically to the substrates 1 and 2 in accordance with an externally applied electric field (using a display rewriting device or the like). The black display medium 3B is visually recognized by the observer for black display, or the white display medium 3W is visually recognized by the observer for white display. A cell 11 is formed by providing partition walls 4 between the substrates 1 and 2 in a lattice shape, for example. Moreover, in FIG. 1, the partition in front is abbreviate | omitted. The combination of colors to be used is not limited to black and white, and can be selected according to the display purpose, such as an easy-to-see color combination or a conspicuous color combination.

  The above description is similarly applied to the case where the white display medium 3W including the particle group is replaced with the white display medium including the powder fluid and the black display medium 3B including the particle group is replaced with the black display medium including the powder fluid. I can do it. The powder fluid will be described in detail later.

  In the present invention described above, as shown in FIG. 1, an important feature is that the conductive member 12 made of a conductive metal oxide or a conductive polymer material is formed on the surfaces of the substrates 1 and 2 on the side in contact with the display medium 3. Is provided in contact with the display medium 3. The conductive member 12 disposed so as to be in contact with the display medium 3 inside the transparent substrate 2 on the display surface side needs to be transparent, but is disposed so as to be in contact with the display medium 3 inside the substrate 1. The conductive member 12 is not necessarily transparent. When the display surface is only on one side, the conductive member provided on the back side substrate may be opaque, but when both surfaces are display surfaces, both of them need to be transparent. Furthermore, in this example, the line-shaped conductive members 12 are arranged on the substrates 1 and 2 so as to cross each other. At this time, the conductive member 12 is provided so that the end portion of the conductive member 12 overlaps the partition wall 4 so that there is no portion exposed to the cell 11 on the surface of the substrates 1 and 2.

  Examples of the conductive metal oxide constituting the conductive member 12 disposed in contact with the display medium 3 inside the substrates 1 and 2 include ITO (indium tin oxide), zinc oxide, indium oxide, tin oxide, and the like. Examples of the conductive polymer material constituting the conductive member 12 that can be used and arranged to contact the display medium 3 inside the substrates 1 and 2 include conductive polymers such as polyaniline, polypyrrole, and polythiophene. Any of these can be used as appropriate. As a method for forming the conductive member 12, a method of patterning and forming the above exemplified materials into a thin film by sputtering, vacuum vapor deposition, CVD (chemical vapor deposition), coating, or the like, or a conductive agent as a solvent or a synthetic resin binder. A method of forming a pattern by mixing and coating is used.

  In the present invention described above, the conductive member 12 is disposed in contact with the display medium 3 inside the substrates 1 and 2 to rewrite information when the display medium 3 is moved by applying an electric field from the outside. An information display panel having good display rewriting durability can be obtained with a low driving voltage. In the present invention, by disposing the conductive member 12 made of a conductive metal oxide or a conductive polymer material on the surfaces of the substrates 1 and 2 so as to be in contact with the display medium 3, rewriting failure that occurs during display rewriting is prevented. The reason why the problem is solved is not elucidated, but when the substrate surface in contact with the display medium (particles) is composed of an insulating material as in the past or a conductive material such as metal Since the effect of the present invention cannot be obtained, the difference between the substrate surface state formed of a metal material and the substrate surface state formed of a material like the present invention, the conductivity of an insulating material or a metal material, and It is considered that the difference with the conductivity of the surface of the substrate formed of such a material is related.

  In the present invention described above, the partition 4 is provided between the substrates 1 and 2 enclosing the display medium 3 in order to prevent the display medium 3 from being unevenly distributed. The partition 4 may be a continuous one that completely forms a cell surrounded by the partition, or an intermittent one that is incompletely surrounded by the partition. What is necessary is just to have the function to hold | maintain to a predetermined magnitude | size, and the function to prevent uneven distribution of a display medium.

  2 to 4 are diagrams for explaining other examples of the information display panel of the present invention. In the example shown in FIGS. 2 to 4, the same members as those shown in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted. Among the examples shown in FIGS. 2 to 4, in the example shown in FIG. 2, the insulating layers 13 are provided on the outside of the conductive member 12 in both the substrates 1 and 2. In the example shown in FIG. 3, on both the substrates 1 and 2, one continuous conductive member 12 is provided on each of the substrates 1 and 2. In the example shown in FIG. 4, the conductive member 12 is provided not only on the surfaces of the substrates 1 and 2 but also on the surface of the partition wall 4 so that the entire inner surface of the cell 11 is covered with the conductive member 12. In any example, the present invention can be more suitably implemented.

  5 and 6 are diagrams for explaining still other examples of the information display panel of the present invention. In the example shown in FIGS. 5 and 6, the same members as those shown in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted. The example shown in FIGS. 5 and 6 shows an example in which color display is possible. In the transparent substrate 2 on the display surface side, three primary colors corresponding to the cell 11 composed of the air space partitioned by the partition walls 4 are shown. Color display is possible by configuring the color filters 14R (red), 14G (green), and 14B (blue) separately, and configuring one pixel from the three cells 11 each provided with the color filters 14R, 14G, and 14B. I have to.

  Among the examples shown in FIGS. 5 and 6, the example shown in FIG. 5 shows an example in which the color filters 14 </ b> R, 14 </ b> G, and 14 </ b> B are provided on the outer surface of the transparent substrate 2 at a position away from the conductive member 12. . In the example shown in FIG. 6, the color filters 14 </ b> R, 14 </ b> G, and 14 </ b> B are arranged so as to be in contact with the transparent conductive member 12. In any example, the color display in the present invention can be suitably performed.

  In the case of color display, a unit consisting of three cells in which three primary color filters are arranged as one set is a pixel unit, and a partition wall 4 (two partition walls at both ends in the figure) that forms the boundary of this pixel unit. ) Plays the role of maintaining the gap between the substrates at a predetermined size, but the other partition walls 4 (in the figure, the two partition walls at the center excluding the two partition walls at both ends) For example, one end of the partition 4 may not be in contact with the substrate. By performing independent display medium movement for each cell included in the pixel unit, color display by combining three colors obtained through the color filter can be performed.

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

  As for the substrate, one substrate on which the color filter is provided is the transparent substrate 2 on which the color of the display medium 3 can be confirmed from the outside of the panel, and a material having high visible light transmittance and good heat resistance is preferable. The substrate 1 may be transparent or opaque, but if it is transparent, double-sided display is possible. As the substrate, inorganic substrates such as glass and ceramics, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyethersulfone (PES), polyethylene (PE), polycarbonate (PC), polyimide (PI), An organic polymer-based substrate such as acrylic can be used. The thickness of the substrate is preferably from 2 to 5000 μm, more preferably from 5 to 2000 μm. If it is too thin, it will be difficult to maintain the strength and the spacing uniformity between the substrates, and if it is thicker than 5000 μm, it will be a thin information display panel. Is inconvenient.

The shape of the partition walls 4 provided on the substrate is optimally set as appropriate 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 walls is 2 to 100 μm, preferably The height of the partition wall is adjusted to 10 to 100 μm, preferably 10 to 50 μm, to 3 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. 7, the cells formed by the partition walls made of these ribs are exemplified by a square shape, a triangular shape, a line shape, a circular shape, and a hexagonal shape as viewed from the substrate plane direction. And a mesh shape. It is better to make the portion corresponding to the cross section of the partition wall visible from the display surface side (the area of the cell frame) as small as possible, and the display becomes clearer.
Examples of the method for forming the partition include a mold transfer method, a screen printing method, a sand blast method, a photolithography method, and an additive method. Any of these methods can be suitably used for the information display panel of the present invention, and among these, a photolithography method using a resist film and a mold transfer method are suitably used.

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

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

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

The information display panel of the present invention encloses a powder fluid exhibiting high fluidity in an aerosol state in which solid particles are stably suspended as a dispersoid, for example, in a gas, between opposed substrates, at least one of which is transparent. In addition, such a powder fluid can be easily and stably moved by a Coulomb force or the like with a small electric field.
As described above, 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 particles (hereinafter also referred to as particles) constituting the display medium in the information display panel of the present invention will be described. The display medium particles are composed of the display medium particles as they are to form a display medium, or are combined with other particles to form a display medium, or adjusted and configured to become a powder fluid to form a display medium. Or used.
The particles can contain a charge control agent, a colorant, an inorganic additive, and the like, if necessary, in the resin as the main component, as in the conventional case. Examples of resins, charge control agents, colorants, and other additives will be given below.

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

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

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

Examples of the black colorant include carbon black, copper oxide, manganese dioxide, aniline black, activated carbon and the like.
Examples of blue colorants include C.I. I. Pigment blue 15: 3, C.I. I. Pigment Blue 15, Bituminous Blue, Cobalt Blue, Alkaline Blue Lake, Victoria Blue Lake, Phthalocyanine Blue, Metal-free Phthalocyanine Blue, Phthalocyanine Blue Partial Chlorides, Fast Sky Blue, Indanthrene Blue BC, and the like.
Examples of red colorants include bengara, cadmium red, red lead, mercury sulfide, cadmium, permanent red 4R, risor red, pyrazolone red, watching red, calcium salt, lake red D, brilliant carmine 6B, eosin lake, rhodamine lake B, Alizarin Lake, Brilliant Carmine 3B, C.I. I. Pigment Red 2 etc.

Yellow colorants include chrome yellow, zinc yellow, cadmium yellow, yellow iron oxide, mineral first yellow, nickel titanium yellow, navel yellow, naphthol yellow S, Hansa Yellow G, Hansa Yellow 10G, Benzidine Yellow G, Benzidine Yellow GR, Quinoline Yellow Lake, Permanent Yellow NCG, Tartrazine Lake, C.I. I. Pigment Yellow 12 etc.
Examples of green colorants include chrome green, chromium oxide, pigment green B, C.I. I. Pigment Green 7, Malachite Green Lake, Final Yellow Green G, etc.
Examples of the orange colorant include red chrome yellow, molybdenum orange, permanent orange GTR, pyrazolone orange, Vulcan orange, indanthrene brilliant orange RK, benzidine orange G, indanthrene brilliant orange GK, C.I. I. Pigment Orange 31 etc.
Examples of purple colorants include manganese purple, first violet B, and methyl violet lake.
Examples of white colorants include zinc white, titanium oxide, antimony white, and zinc sulfide.

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

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

  The particles for display media of the present invention (hereinafter also referred to as particles) preferably have an average particle diameter d (0.5) in the range of 0.1 to 20 μm and are uniform and uniform. If the average particle diameter d (0.5) is larger than this range, the display is not clear. 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 uniform display medium movement becomes possible.

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

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

Furthermore, when applying a display medium such as a particle group or a powder fluid composed of particles for a display medium to a dry information display panel, it is important to manage the gas in the void surrounding the display medium between the substrates, Contributes to improved display stability. Specifically, it is important that the relative humidity at 25 ° C. is 60% RH or less, and preferably 50% RH or less for the humidity of the gas in the gap.
In FIG. 1 to FIG. 6, the void portion refers to the occupied portion of the display medium 3, the occupied portion of the partition wall 4 (when the partition wall is provided), the color filter portion, from the portion sandwiched between the opposing substrates 1 and 2. (When a color filter is provided on the inside of the substrate), it refers to a gas portion in contact with a so-called display medium excluding the seal portion of the information display panel.
The gas in the gap is not limited as long as it is in the humidity region described above, but dry air, dry nitrogen, dry argon, dry helium, dry carbon dioxide, dry methane, and the like are preferable. This gas needs to be sealed in an information display panel so that the humidity is maintained, for example, filling a display medium, assembling an information display panel in a predetermined humidity environment, It is important to apply a sealing material and a sealing method that prevent moisture from entering from the outside.

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

<Example 1>
An information display panel having a structure in which a black and white two-color display medium shown in FIG. 1 is enclosed was prepared by providing a conductive member 12 made of ITO on the outermost surface of each of the glass substrates 1 and 2. Rewriting was performed 100 times with an external electric field type display rewriting device, but all could be rewritten reliably. The rewrite information was displayed on the front and back of the panel in a positive / negative relationship and could be observed on both sides of the panel.

<Example 2>
An information display panel having a configuration in which a black and white two-color display medium shown in FIG. 1 is enclosed was prepared by providing a conductive member 12 made of ITO on the outermost surface of each of the PET substrates 1 and 2. Rewriting was performed 100 times with an external electric field type display rewriting device, but all could be rewritten reliably. The rewrite information was displayed on the front and back of the panel in a positive / negative relationship and could be observed on both sides of the panel.

<Comparative Example 1>
The information display panel having the configuration shown in FIG. 8 was produced without providing the conductive member 12 made of ITO on the glass substrates 51 and 52. When rewriting was performed 100 times with an external electric field type display rewriting device, rewriting failure occurred twice.

<Comparative example 2>
The information display panel having the configuration shown in FIG. 8 was produced without providing the conductive member 12 made of ITO on the PET substrates 51 and 52. When rewriting was performed 100 times with an external electric field type display rewriting device, rewriting failure occurred 5 times.

  The information display panel according to the present invention includes display units for mobile devices such as notebook computers, PDAs, mobile phones, and handy terminals, electronic papers such as electronic books and electronic newspapers, bulletin boards such as signboards, posters, and blackboards, calculators, and home appliances. It is suitably used for display parts for automobile supplies, card display parts such as point cards and IC cards, electronic advertisements, electronic POPs, electronic price tags, electronic shelf labels, electronic musical scores, and display parts for RF-ID devices.

It is a figure which shows an example of the information display panel of this invention. It is a figure which shows the other example of the information display panel of this invention. It is a figure which shows the further another example of the information display panel of this invention. It is a figure which shows the further another example of the information display panel of this invention. It is a figure which shows the further another example of the information display panel of this invention. It is a figure which shows the further another example of the information display panel of this invention. It is a figure which shows an example of the shape of the partition in the information display panel of this invention. It is a figure for demonstrating an example 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 display medium particle 3B Black display medium 3Ba Black display medium particle 4 Bulkhead 5, 6 Electrode 11 Cell 12 Conductive member 13 Insulating layer 14R, 14G, 14B Color filter

Claims (3)

  Two colors by applying an electric field from the outside to a two-color display medium with different optical reflectivity and charging characteristics enclosed between a plurality of cells in the air hollow partitioned by a partition between at least one transparent substrate An information display panel that displays information such as an image by moving the display medium, and a conductive member made of a conductive metal oxide or a conductive polymer material on the substrate surface in contact with the display medium, An information display panel provided to be in contact with a display medium.   The information display panel according to claim 1, wherein the conductive member provided on the display surface side is a transparent conductive member.   A white display medium and a black display medium are used as the display medium, and color filters of three primary colors are arranged corresponding to the cells composed of the air space partitioned by the partition walls, and one pixel is composed of three cells. The information display panel according to claim 1 or 2.

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