JP2007047262A - Panel for information display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a panel for information display, with which a more persuasive presentation such as later insertion of memos thereinto and so on is made possible by making insertion of a marking into, or addition of notes to, information such as an image displayed on a front panel to be a display surface available. <P>SOLUTION: In the panel for information display to display information such as an image by imparting an electric field to a display medium 3 sealed in between the transparent front panel 12 and a rear panel 1 placed opposite to each other and moving the display medium, the transparent front panel is constructed so as to be able to write the information therein by using ink, and the written information is erasable by using an eraser. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an information display panel that displays information such as an image by moving the display medium by applying an electric field to the display medium sealed between a transparent front panel and a back panel facing each other.

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

  Compared to LCDs, these conventional technologies have advantages such as a wide viewing angle close to that of ordinary printed materials, low power consumption, and a memory function. It is considered as a technology that can be used for mobile phones, and is expected to expand to information display for mobile terminals, electronic paper, and the like. Particularly recently, an electrophoretic method in which a dispersion liquid composed of dispersed particles and a colored solution is encapsulated and disposed between opposing substrates has been proposed and is expected.

  However, the electrophoresis method has a problem that the response speed becomes slow due to the viscous resistance of the liquid because the particles migrate in the liquid. Furthermore, since particles with high specific gravity such as titanium oxide are dispersed in a solution with low specific gravity, it is easy to settle, it is difficult to maintain the stability of the dispersed state, and the stability of repeated rewriting of information display is lacking. Have Even when microencapsulation is performed, the cell size is set to the microcapsule level, and the above-described drawbacks are hardly made to appear, and the essential problems are not solved at all.

  On the other hand, a method in which conductive particles and a charge transport layer are incorporated into a part of a substrate without using a solution is proposed instead of an electrophoresis method using behavior in a solution (see, for example, Non-Patent Document 1). ). However, the structure is complicated because the charge transport layer and further the charge generation layer are arranged, and it is difficult to uniformly inject the charge into the conductive particles.

As a method for solving the various problems described above, by applying an electric field to the display medium sealed between the transparent front panel and the back panel facing each other, the display medium is moved to display information such as an image. An information display panel is known.
趙 Kuniaki and three others, “New Toner Display Device (I)”, July 21, 1999, Annual Meeting of the Imaging Society of Japan (83 times in total) “Japan Hardcopy'99” Proceedings, p.249-252

  In the information display panel described above, information such as images can be suitably displayed on the front panel serving as the display surface, and it is used for distribution materials and presentations. However, the information display panel displays the information on the outer surface of the front panel serving as the display surface. There is a problem in that it is difficult to mark or write information or data such as images, and to write a memo later or to make a more convincing presentation.

  The object of the present invention is to solve the above-mentioned problems, and allows marking or writing to information such as an image displayed on the front panel serving as a display surface. It is intended to provide an information display panel that can be filled in and give a more convincing presentation.

  The information display panel according to the present invention is an information display panel that displays information such as an image by moving the display medium by applying an electric field to the display medium sealed between the transparent front panel and the rear panel facing each other. The transparent front panel has a configuration in which information can be written using ink and information written by the eraser can be erased.

  As a suitable example of the information display panel of the present invention, the front panel is composed of a front substrate and a top coat layer, and the top coat layer is a method such as vapor deposition of a transparent resin layer on the surface of the front substrate, a coating film, etc. Or a transparent resin film attached to the surface of the front substrate, and the top coat layer has a thickness in the range of 2 to 20 μm.

  According to the information display panel of the present invention, the transparent front panel has a configuration in which information can be written using ink and information written by the eraser can be erased. In addition to the function to display information such as images, it can also have a writing board function, and it can be written on the front panel on which information is displayed with a commercially available whiteboard ink pen. The writing can be erased by the eraser for whiteboard. As a result, you can write notes later or give a more convincing presentation.

  First, a basic configuration for displaying information such as an image on the information display panel of the present invention will be described. In the information display panel of the present invention, an electric field is applied to the display medium sealed between the 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 changing the electric field direction by switching the potential, thereby displaying information such as an image. Is made. The displayed information is held as it is until it is rewritten next time. Therefore, it is necessary to design the information display panel so that the display medium can move uniformly and maintain the rewrite stability of display information or the continuous display stability of display information. Here, as the force applied to the particles constituting the display medium, in addition to the force attracted by the Coulomb force between the particles, an electric image force with the substrate, intermolecular force, liquid cross-linking force, gravity and the like can be considered.

  An example of the information display panel of the present invention described above will be described with reference to FIGS. 1 (a) and (b) to FIGS. 3 (a) and 3 (b).

  In the example shown in FIGS. 1A and 1B, at least two types of display media 3 (here, white display consisting of a group of particles) having at least one type of particles and different optical reflectance and charging characteristics. A black display medium 3B composed of a medium 3W and a particle group is enclosed between the substrate 1 and the substrate 2, and the substrates 1 and 2 according to the electric field generated by using some voltage applying means between the substrates. The black display medium 3B is visually recognized by the observer and black display is performed, or the white display medium 3W is visually recognized by the observer and white display is performed. In the example shown in FIG. 1B, the partition walls 4 are formed between the substrates 1 and 2, and a plurality of rectangular cells are provided in a lattice shape. (The partition in front of the figure is omitted.)

  In the example shown in FIGS. 2A and 2B, at least two types of display media 3 (here, white display consisting of a group of particles) having different optical reflectance and charging characteristics composed of at least one type of particles. In accordance with the electric field generated by applying a voltage between the electrode 5 provided on the inner side of the substrate 1 and the electrode 6 provided on the inner side of the substrate 2. The black display medium 3B is visually recognized by the observer and the black display is performed, or the white display medium 3W is visually recognized by the observer and the white display is performed. . In the example shown in FIG. 2B, a partition wall 4 is formed between the substrates 1 and 2, and a plurality of quadrangular cells are provided in a lattice shape. (The partition in front of the figure is omitted.)

  In the example shown in FIGS. 3A and 3B, at least two or more types of display media 3 (here, a white display consisting of a group of particles) having different optical reflectance and charging characteristics composed of at least one type of particles. In accordance with the electric field generated by applying a voltage between the electrode 5 provided on the outside of the substrate 1 and the electrode 6 provided on the outside of the substrate 2. The black display medium 3B is visually recognized by the observer and the black display is performed, or the white display medium 3W is visually recognized by the observer and the white display is performed. . In the example shown in FIG. 2B, a partition wall 4 is formed between the substrates 1 and 2, and a plurality of quadrangular cells are provided in a lattice shape. (The partition in front of the figure is omitted.)

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

  4 (a) and 4 (b) are diagrams for explaining the structure of an example of the information display panel of the present invention, FIG. 4 (a) is a plan view thereof, and FIG. 4 (b) is a diagram. Sectional drawing along the AA in 4 (a) is shown. In the example shown in FIGS. 4A and 4B, the information display panel 11 is placed between the front panel 12 and the rear substrate 1 made of the front substrate 2 and the top coat layer 13, and the display medium 3 (here, A white display medium 3W and a black display medium 3B) are enclosed. Thereby, in addition to displaying information, here triangular figures and mathematical expressions, using the display medium 3 on the transparent front panel 12, the information here is displayed using the ink 22 as shown in FIG. A configuration is provided in which the underline 21 can be written and the underline 21 can be erased by an eraser (not shown).

  By using the information display panel 11 described above, the presenter can write the underline 21 and characters on the front panel 12 by himself / herself during the presentation, and can easily erase the characters written by the eraser. It is possible to make a more persuasive presentation.

In addition, in the example shown to Fig.4 (a), (b), it is preferable that the front panel 12 satisfy | fills the structure shown below.
The front panel 12 can display (write, draw) some information using ink on the front surface.
The front panel 12 can wipe off ink adhering to the front surface with an eraser (erase the displayed information).
The front panel 12 can be handwritten with characters, pictures, diagrams, lines, tables, etc. on the front surface using a whiteboard marker as a writing instrument.
-The ink used is alcohol-based ink, water-based ink, oil-based ink or the like.
For the whiteboard marker and eraser, commercially available products available at ordinary office supply stores can be used.
The front panel 12 transmits visible light.
The front substrate 2 has such a hardness that it is not easily deformed (depressed) when pressed at the tip of the whiteboard marker.
-As an example of the front panel 12, the panel made from transparent resin and glass which consist of PET (polyethylene terephthalate) are mentioned.

Moreover, in the example shown to Fig.4 (a), (b), it is preferable that the topcoat layer 13 satisfy | fills the structure shown below.
The top coat layer 13 may be formed by depositing a transparent resin layer on the surface of the front substrate 2 using a method such as vapor deposition or coating, or by attaching a transparent resin film to the surface of the front substrate 2. it can.
The top coat layer 13 is a transparent resin composition in which an additive such as a curing agent is blended with a resin composition in which about 5 to 10 parts by weight of a block copolymer having a fluoroalkyl group is blended with 100 parts by weight of a resin binder. Alternatively, it is formed of a transparent resin composition mainly composed of silicon or fluorine.
The top coat layer 13 is formed to a thickness of about 2 μm to 20 μm by coating or the like.
-Transparent resin among thermosetting resins such as acrylic urethane resin is used for the resin binder of the topcoat layer 13, and Modiper F (trade name of Nippon Oil & Fats Co., Ltd.) and Aron G are used for the block copolymer. (Toa Gosei Chemical Co., Ltd. product name) etc. are used

  FIG. 5 and FIG. 6 are diagrams for explaining an example of a usage scene in the information display panel of the present invention. In the example shown in FIG. 5, the information display panel of the present invention can be displayed by passing the copy machine 31 instead of paper, and the contents to be copied can be displayed, and a memo or the like is written on the pen 32. Can do. In the example shown in FIG. 6, the information display panel of the present invention can be displayed by passing the printer 33 instead of paper, so that the contents to be printed can be displayed, and a memo or the like can be written on the pen 32. it can.

  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 polymer sheets such as polyethylene terephthalate, polyethylene naphthalate, polyethersulfone, polyethylene, polycarbonate, polyimide, and acrylic, flexible materials such as metal sheets, and glass and quartz. An inorganic sheet having no flexibility is mentioned. The thickness of the substrate is preferably from 2 to 5000 μm, more preferably from 5 to 2000 μm. If it is too thin, it will be difficult to maintain the strength and the spacing uniformity between the substrates, and if it is thicker than 5000 μm, it will be a thin information display panel. Is inconvenient.

  Electrode forming materials for providing electrodes on information display panels include metals such as aluminum, silver, nickel, copper, and gold, and conductive metal oxides such as ITO, indium oxide, conductive tin oxide, and conductive zinc oxide. , Conductive polymers such as polyaniline, polypyrrole, and polythiophene are exemplified and 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 front substrate 2 that is visible and needs to be transparent needs to be transparent, but the electrode provided on the back substrate 1 does not need to 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 and thickness of the electrodes provided on the back substrate 1 are the same as those of the electrodes provided on the display surface side substrate described above, but need not be transparent. In this case, the external voltage input may be superimposed with direct current or alternating current.

  When the partition walls are provided on the substrate, the height and width of the partition walls are appropriately set according to the type of display medium involved in the display, and are not limited in general. However, the partition wall width is 2 to 100 μm, preferably 3 to 50 μm. The height is adjusted to 10 to 500 μm, preferably 10 to 200 μm. The cell shape in the information display panel obtained by superimposing the display side substrate and the back side substrate may be various shapes as illustrated in FIG. It is better to make the portion corresponding to the partition cross section visible from the display surface side (the area of the cell frame formed by the partition width) as small as possible, and the display state becomes clearer. This partition also has a function of supporting the front substrate so as not to be deformed when the front substrate is pressed with the tip of the whiteboard marker.

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

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

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

The information display panel of the present invention encloses a powder fluid exhibiting high fluidity in an aerosol state in which solid particles are stably suspended as a dispersoid, for example, in a gas between opposing substrates, at least one of which is transparent. Yes, such a powder fluid can be easily and stably moved by a Coulomb force or the like by applying a low voltage.
As described above, 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.

  Further, the particles of the present invention preferably have an average particle diameter d (0.5) in the range of 0.1 to 20 μm and are uniform and uniform. If the average particle diameter d (0.5) is larger than this range, the display is not clear, and if it is smaller than this range, the cohesive force between the particles becomes too large, which hinders the movement of the display medium.

Furthermore, in the present invention, regarding the particle size distribution of each particle, the particle size distribution Span represented by the following formula is less than 5, preferably less than 3.
Span = (d (0.9) −d (0.1)) / d (0.5)
(However, d (0.5) is a numerical value expressing the particle diameter in μm that 50% of the particles are larger than this and 50% is smaller than this, and d (0.1) is a particle in which the ratio of the smaller particles is 10%. (Numerical value expressed in μm, and d (0.9) is a numerical value expressed in μm for a particle diameter of 90% or less.)
By keeping Span within a range of 5 or less, the size of each particle is uniform, and the display medium can be moved uniformly.

  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, particles are introduced 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.

  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 inventors of the present invention have been able to evaluate the range of proper charging characteristics of display medium particles by measuring the charge amount of display medium particles using the same carrier particles in the blow-off method. I found it.

Furthermore, when the present invention is used as a dry information display panel, it is important to manage the gas in the gap surrounding the display medium, which contributes to improved display stability. Specifically, it is important that the relative humidity at 25 ° C. is 60% RH or less, preferably 50% RH or less, more preferably 35% RH or less with respect to the humidity of the gas in the gap.
1A, 1B, 3A, and 3B, the gaps are defined by the electrodes 5 and 6 (the electrodes are placed on the inside of the substrate). When provided), it refers to a gas portion in contact with a so-called display medium excluding the occupied portion of the display medium 3 (particle group or powdered fluid), the occupied portion of the partition wall 4, and 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.

  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. Handwritten on the display surface of display parts such as car supplies, card display parts such as point cards and IC cards, electronic advertisements, electronic POPs, electronic shelf labels, electronic price tags, electronic musical scores, and display parts of RF-ID devices It is suitably used for applications in which information can be written and erased.

(A), (b) is a figure which shows an example of the structure used for an information display among the information display panels of this invention, respectively. (A), (b) is a figure which shows the other example of the structure used for information display among the information display panels of this invention, respectively. (A), (b) is a figure which shows the further another example of the structure used for an information display among the information display panels of this invention, respectively. (A), (b) is a figure for demonstrating an example of the information display panel of this invention, respectively. It is a figure for demonstrating an example of the utilization scene in the information display panel of this invention. It is a figure for demonstrating the other example of the utilization scene in 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.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 2 Substrate 3 Display medium 3W White display medium 3B Black display medium 4 Bulkhead 5, 6 Electrode 11 Information display panel 12 Front panel 13 Topcoat layer 21 Underline 22 Ink 31 Copy machine 32 Pen 33 Printer

Claims (4)

  In an information display panel that displays information such as an image by moving the display medium by applying an electric field to the display medium enclosed between the transparent front panel and the back panel that are opposed to each other, the transparent front panel includes ink. An information display panel characterized by having a configuration in which information can be written using an erasure and information written by an eraser can be erased.   The information display panel according to claim 1, wherein the front panel includes a front substrate and a topcoat layer.   The top coat layer is formed by depositing a transparent resin layer on the surface of the front substrate by using a method such as vapor deposition or coating, or by attaching a transparent resin film to the surface of the front substrate. The information display panel according to claim 2, wherein   4. The information display panel according to claim 2, wherein the thickness of the top coat layer is in the range of 2 to 20 [mu] m.

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