JP2007178880A - Information display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information display panel capable of displaying information of an image or the like at a low cost, in use where it is only necessary to display the information of the image or the like that is fixed in a specified pattern. <P>SOLUTION: The information display panel 11 is constituted so that a display medium is enclosed between two substrates opposite each other and at least one of which is transparent, and the display medium is moved to display information of the image or the like by applying an electric field to the display medium. Two kinds of display media: a light pale color and a dark deep color are used, and a light transmissive display body 12 is arranged on a front substrate serving as a display face. The information of the image or the like on the light transmissive display body is displayed, by driving the light pale colored display medium only of the portion to display the information so as to be located on the front face, and is deleted by driving the dark deep colored display medium on that portion so as to be located on the front face. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is for information display in which a display medium is sealed between two opposing substrates at least one of which is transparent, and an electric field is applied to the display medium to move the display medium to display information such as an image. It is about the panel.

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

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

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

As a method for solving the above-described problems, a display medium is sealed between two substrates, at least one of which is transparent, and an electric field is applied to the display medium, whereby the display medium is moved to display information such as an image. An information display panel to be displayed 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 conventional information display panel described above, in order to display free image information, it is indispensable to drive the display medium for each pixel, but only displays information such as an image fixed in a fixed pattern. However, there is a problem in that it is over-spec for high-use applications, resulting in high costs.

  An object of the present invention is to solve the above-mentioned problems and to display information such as an image at a low cost for an application that only needs to display information such as an image fixed in a fixed pattern. Panel to provide.

  The information display panel of the present invention encloses a charging display medium between two opposing substrates, at least one of which is transparent, and applies an electric field to the display medium to move the display medium and display an image. Information display panel that uses two types of display media of light and dark colors and dark and dark colors, and a light transmissive display body is disposed on the front substrate on the display surface side to transmit light. Information such as images on the mold display is displayed by driving the light and light color display medium to the front only in the part where the information is to be displayed, and the dark and dark color display medium is located in the front in that part. It is characterized by being driven and erased.

  As a preferred example of the information display panel of the present invention, an integral electrode is provided on each substrate one by one, and the light / dark color display medium or the dark / dark color display medium is positioned on the entire front substrate on the display surface side. To display and erase information, the light and light color display medium has a metallic luster, the light and light color display medium is a white display medium, and dark and dark colors. The display medium is a black display medium, the light transmissive display body is a transparent film on which information such as an image is drawn with light transmissive ink, and the light transmissive display body is light transmissive with both substrates transparent. Type liquid crystal display panel.

  According to the present invention, information for displaying information such as an image by moving a display medium by enclosing the display medium between two opposing substrates at least one of which is transparent and applying an electric field to the display medium. A display panel that uses two types of display media of light and dark colors and dark and dark colors, and a light transmission type display body is disposed on a front substrate on the display surface side, and an image on the light transmission type display body, etc. The information is displayed by driving the light and light color display medium so that it is located in front only in the part where the information is to be displayed, and by driving the dark and dark color display medium so as to be located in front in that part. Thus, an information display panel capable of displaying information such as an image at a low cost can be obtained for an application that only needs to display information such as an image fixed in a fixed pattern.

  First, the basic configuration of 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 a display medium sealed between two opposing substrates. The charged display medium is attracted by the electric field force or Coulomb force along the applied electric field direction, and the display medium changes its moving state due to the change of the electric field direction due to the potential switching. Therefore, it is necessary to design the information display panel so that the display medium moves uniformly and can maintain the stability at the time of display rewriting or continuous display. 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 the information display panel of the present invention will be described with reference to FIGS. 1 (a) and (b) to FIGS. 2 (a) and 2 (b).

  In the example shown in FIGS. 1A and 1B, at least two kinds of display media 3 (here, white display medium particles 3Wa) having at least one kind of particles and having different optical reflectance and charging characteristics. Between the electrode 5 provided on the substrate 1 and the electrode 6 provided on the substrate 2 is a voltage between the electrode 5 provided on the substrate 1 and the electrode 6 provided on the substrate 2. In accordance with the electric field generated by applying, the substrate is moved perpendicularly to the substrates 1 and 2 so that the black display medium 3B is visually recognized by the observer and black display is performed, or the white display medium 3W is provided to the observer. A white display is made by visual recognition. In the example shown in FIG. 1B, for example, a partition 4 is provided in a lattice shape between the substrates 1 and 2 to form cells. In addition, in FIG. 1B, the partition in front is omitted.

  In the example shown in FIGS. 2A and 2B, at least two or more types of display media 3 (here, white display medium particles 3Wa) having different optical reflectance and charging characteristics composed of at least one type of particles. A white display medium 3W composed of a group of particles and a black display medium 3B composed of a group of particles 3Ba for black display medium) are perpendicular to the substrates 1 and 2 according to the electric field applied from the outside of the substrates 1 and 2. The black display medium 3B is visually recognized by the observer and black display is performed, or the white display medium 3W is visually recognized by the observer and white display is performed. In the example shown in FIG. 2B, in addition to the example shown in FIG. 2A, for example, a partition 4 is provided between the substrates 1 and 2 to form a cell. Further, in FIG. 2 (b), the front partition is omitted.

  The information display panel according to the present invention is characterized in that it is an information display panel using the two types of display media having the above-described configuration and a light transmission type display, and two types of display media of light and light colors and dark and dark colors. In addition, a light transmissive display body is disposed on the front substrate on the display surface side, and information such as images on the light transmissive display body is positioned on the front side only in the portion where the information is to be displayed. The display is driven and displayed in such a manner, and the dark and dark color display medium is driven and erased so as to be positioned in front of the display.

  3A and 3B are diagrams for explaining an example of the information display panel of the present invention. In the example shown in FIGS. 3A and 3B, the same members as those in the example shown in FIGS. 1A and 1B are denoted by the same reference numerals, and the description thereof is omitted. In the example shown in FIGS. 3A and 3B, as described above, the light transmission type display body 12 is provided outside the front substrate (substrate 2) which becomes the display surface of the information display panel 11. With this configuration, as shown in FIG. 2A, information such as an image on the light transmission display 12 is displayed by driving the white display medium 3W to be positioned in front only in a portion where information is to be displayed. In addition, as shown in FIG. 2B, information such as an image on the light transmission type display body 12 is erased by driving the black display medium 3B to the front in only the portion where the information is to be displayed. can do.

  In the information display panel of the present invention, light is applied to the front substrate 2 of the information display panel 11 using two types of display media of light and dark colors and dark and dark colors (white display medium 3W and black display medium 3B in the above example). Since the transmissive display body 12 is arranged, information is not visible when there is no dark reflection (the state of FIG. 3B) because there is no reflection of light. In the state a), since the light is reflected and transmitted through the light transmissive display body 12, display information on the light transmissive display body 12 can be visually recognized.

  As the light transmissive display body 12 used in the information display panel of the present invention, as shown in FIG. 4A, a transparent film 22 on which information such as an image is drawn with a light transmissive ink 21, or FIG. As shown in b), a light transmission type liquid crystal display panel in which a liquid crystal 24 is filled between substrates whose both surfaces of the substrate 23 are transparent can be suitably used.

  In the information display panel described above, a plurality of electrodes 5 and 6 arranged in parallel with each other are provided on the substrates 1 and 2 so as to cross each other at a substantially right angle, and are driven in a matrix manner, so that information such as images can be obtained. An example has been shown in which the light and light color display medium 3W comes to the front only in the portion to be displayed, thereby improving the visibility only in this portion. However, the information display panel of the present invention is not limited to this, and when the information display panel is used only for display ON / OFF of the entire screen, it is not necessary to drive the information display panel in a matrix manner. In addition, an integrated electrode is provided on each of the substrates 1 and 2 one by one, and the light / light color display medium 3W or dark / dark color display medium 3B is positioned so that the light / light color display medium 3W or dark / dark color display medium 3B is located on the entire front surface serving as a display surface. It is possible to use so-called full-surface driving that drives the color display medium 3B to be positioned. In this case, the information display panel can be configured at a lower cost. Further, when the display pattern on the light transmission type display body 12 is not complicated, the electrodes 5 and 6 can be provided on both the substrates 1 and 2 corresponding to the display pattern to perform segment driving.

  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 display surface side substrate 2 which is on the viewing side and needs to be transparent needs to be transparent, but the electrode provided on the back side 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 electrode provided on the back side substrate 1 are the same as those of the electrode provided on the display surface side substrate described above, but need not be transparent. In this case, the external voltage input may be superimposed with direct current or alternating current.

The shape of the partition walls 4 provided on the substrate as required is appropriately set appropriately depending on the type of display medium involved in display, the shape and arrangement of electrodes to be arranged, and is not limited in general. The height of the partition is adjusted to 100 to 100 μm, preferably 3 to 50 μm, and the height of the partition wall to 10 to 100 μm, preferably 10 to 50 μm.
In forming the partition wall, a both-rib method in which ribs are formed on each of the opposing substrates 1 and 2 and then bonded, and a single-rib method in which ribs are formed only on one substrate are conceivable. In the present invention, any method is preferably used.
As shown in FIG. 5, the cells formed by the partition walls made up of these ribs are illustrated in 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.

  The 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 particles for the display medium are used as they are as the display medium by being composed only of the particles for the display medium, are combined with the external additive particles to be a display medium, and are further combined with other particles to be a display medium. The display medium 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 external additive particles to be combined with the display medium particles, fine particles used as toner external additives in electrophotography and the like can be suitably used. External additive fine particles include silica, titania, alumina, zirconia, yttria, calcium oxide, magnesium oxide, barium oxide, beryllium oxide, zinc oxide, tin oxide and other metal oxide inorganic fine particles, and a crosslinked resin. Fine particles are exemplified, and silica, titania, and crosslinked resin fine particles are particularly preferably used for this purpose. The surface of the external additive particles is preferably hydrophobized. However, as a result of detailed investigations by the inventors, it is not sufficient to simply coat the surface with a hydrophobic substance (for example, dimethylpolysiloxane). The mechanism of hydrophobic expression is not particularly limited, but it is important that the hydrophilic group on the surface of the external additive particle and the hydrophobic structure form a chemically strong bond with the reactive treatment agent. I found it. This is because the interaction between the hydrophobic substance and the surface of the external additive particle is close to or less than the interaction between the surface of the external additive particle and the hydrophobic substance, or between the substrate and the hydrophobic substance. In this case, the substance is detached from the surface of the external additive particles due to collision between the display medium particles and the display medium particles due to the movement of the display medium particles, and between the display medium particles and the substrate. It is presumed that a strong cohesive force is generated by exposing the surface of the nature.

  Examples of the reactive treating agent used for the hydrophobizing treatment of the external additive particle surface include hexamethyldisilazane, octylsilane, (octyl / decyl / nonyl / (4-isopropylphenyl) / (4-tert Butylphenyl)) (trichloro / trimethoxy / triethoxy) silane, di (pentyl / hexyl / octyl / nonyl / decyl / dodecyl / (4-tert.butylphenyl) octyl / cenyl / nonenyl / -2-ethylhexyl / -3, 3-Dimethylpentyl) (dichloro / dimethoxy / diethoxy) silane, tri (isopropyl / hexyl / octyl / decyl / methyl /) (chloro / methoxy / ethoxy) silane, (dioctylmethyl / octyldimethyl / (4-isopropylphenyl) diethyl ) (Chloro / methoxy / ethoxy) silane, methyl hydrogen (poly) siloxane, methyl hydrogen (poly) siloxane and dimethyl (poly) siloxane Xanthane (random / co) (polymer / oligomer), trimethylsiloxysilicic acid, aluminum (stearate / laurate), iron stearate, acetoalkoxyaluminum diisopropylate, isopropyl (triisostearoyl / tridodecylbenzenesulfonyl) titanate, Isopropyltris (dioctylpyrophosphate) titanate, bis (dioctylpyrophosphate) (oxyacetate / ethylene) titanate, diisopropylbis (dioctylpyrophosphate) titanate, tetraisopropylbis (dioctylphosphite) titanate, tetraoctylbis (ditridecylphosphite) ) Titanate, tetra (2,2-diallyloxymethyl-1-butyl) bis (ditridecyl phosphite) titanate, and the like. Further, the treatment method is not particularly limited, but a solution in which the treatment agent is dispersed in a suitable solvent while stirring the external additive particles to be treated with a high-speed rotating blade type agitator such as a Henschel mixer. And after adding and dispersing the target additive particles in a solution in which the treatment agent is dispersed in an appropriate solvent, the resulting solvent is heated and dried while stirring with a mixer. A method is mentioned.

  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 for display medium (hereinafter also referred to as particles) used in the present invention have an average particle diameter d (0.5) in the range of 0.1 to 20 μm and are preferably 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 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, in the information display panel of the present invention, it is important to manage the gas in the gap surrounding the display medium between the substrates, which contributes to improved display stability. Specifically, it is important that the relative humidity at 25 ° C. is 60% RH or less, and preferably 50% RH or less for the humidity of the gas in the gap.
1A, 1B, 2A and 2B, the gaps are defined as electrodes 5 and 6 (electrodes inside the substrate) from portions sandwiched between the opposing substrates 1 and 2. 2), the occupied portion of the display medium 3, the occupied portion of the partition wall 4 (when the partition wall is provided), and the gas portion in contact with the 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 that is the subject of the present invention is not limited as long as the display medium can be moved and the contrast can be maintained, but is usually adjusted to 10 to 500 μm, preferably 10 to 200 μm.
The volume occupation ratio of the display medium in the space between the opposing substrates is preferably 5 to 70%, more preferably 5 to 60%. If it exceeds 70%, the movement of the display medium is hindered, and if it is less than 5%, the contrast tends to be unclear.

  The information display panel of the present invention can display information such as images at a low cost for applications that only need to display information such as images fixed in a fixed pattern. In combination with a film on which information such as images is drawn with light-transmitting ink, instead of conventional OHP and slides used to show the regimen etc. to the audience at conferences and lectures, light-transmissive display bodies It can be suitably used as an information board, an electronic POP (Point Of Presence, Point Of Purchase advertising), or an electronic shelf label, which is a combination of light transmissive liquid crystal display panels whose both surfaces are transparent.

(A), (b) is a figure which shows an example of the information display panel of this invention, respectively. (A), (b) is a figure which shows the other example of the information display panel of this invention, respectively. (A), (b) is a figure for demonstrating an example of the information display panel of this invention, respectively. (A), (b) is a figure for demonstrating the light transmission type display body used for the information display panel of this invention, respectively. 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 3Wa White display medium particle 3B Black display medium 3Ba Black display medium particle 4 Partition 5 and 6 Electrode 11 Information display panel 12 Light transmission type display 21 Light transmitting ink 22 Transparent film 23 Substrate 24 Liquid crystal

Claims (6)

  Information display for displaying information such as images by moving a display medium by enclosing an electrically charged display medium between two opposing substrates at least one of which is transparent and applying an electric field to the display medium The panel uses two types of display media of light and dark colors and dark and dark colors, and a light transmission type display body is provided on the front substrate on the display surface side, and information such as images on the light transmission type display body Is displayed by driving the light and light color display medium so that it is positioned in the front only in the part where information is to be displayed, and by erasing it by driving the dark and dark color display medium so as to be positioned in the front. An information display panel.   An integrated electrode is provided on each substrate one by one, and a light / dark color display medium or a dark / dark color display medium is driven so as to be positioned on the entire front substrate on the display surface side, so that information is displayed and erased. The information display panel according to claim 1, wherein:   3. The information display panel according to claim 1, wherein the light and light color display medium has a metallic luster.   The information display panel according to claim 1, wherein the light and light color display medium is a white display medium, and the dark and dark color display medium is a black display medium.   5. The information display panel according to claim 1, wherein the light transmission type display body is a transparent film on which information such as an image is drawn with light transmission ink.   5. The information display panel according to claim 1, wherein the light transmission type display body is a light transmission type liquid crystal display panel whose both surfaces are transparent.

Images