JP2007322781A - Panel for information display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information display panel for effectively using a screen by being provided on cantilever support or being bound at one side like a book or a notebook. <P>SOLUTION: The information display panel displays information such as images by enclosing a display medium between two substrates in which at least one is transparent, applying a voltage between electrodes provided on each substrate, and giving an electric field on the display medium to move the display medium for displaying information such as images. Each leading line of the electrode of a display face side and the electrode of a rear face side in a display area of the panel is arranged in one direction of the panel. Preferably, the electrode of the display face side and the electrode of the rear face side are composed of a mutually orthogonally arranged line electrodes. The leading line alone of the electrode of one substrate is brought to the other substrate side, and drawn in the same direction as the leading line of the electrode of the other substrate side. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  In the present invention, a display medium is sealed between two substrates, at least one of which is transparent, a voltage is applied between electrodes provided on each substrate, and an electric field is applied to the display medium, thereby moving the display medium. The present invention relates to an information display panel for displaying information such as images.

Conventionally, a display medium is sealed between two substrates, at least one of which is transparent, a voltage is applied between electrodes provided on each substrate, and an electric field is applied to the display medium, whereby the display medium is moved to display an image, etc. An information display panel for displaying the information is known (see, for example, Patent Document 1).
International Publication WO2003 / 050606 Pamphlet

  In the conventional information display panel described above, the lead-out line of the display surface side substrate electrode and the lead-out line of the back side substrate electrode are usually drawn in two directions at right angles. FIGS. 14A to 14C are diagrams for explaining a configuration of a conventional information display panel. In this example, first, as shown in FIG. 14A, a display surface side line electrode 52 and a lead-out line 53 following the display surface side line electrode 52 are arranged on a transparent display surface side substrate 51 and shown in FIG. As described above, the back-side line electrode 55 and the lead line 56 following the back-side line electrode 55 are arranged on the back-side substrate 54. At this time, when the display surface side substrate 51 and the back surface side substrate 54 are overlapped, the display surface side line electrode 52 and the lead line 53 thereof, and the back surface side line electrode 55 and the lead line 56 are arranged so as to be orthogonal to each other. To do. Then, as shown in FIG. 14C, the display surface side substrate 51 and the back surface side substrate 54 are overlapped, and connectors 63 and 64 are respectively attached to the lead lines 53 and 56 outside the information display area 62 of the panel 61. The connection wirings 65 and 66 are connected at the end surfaces in two directions at right angles to obtain the information display panel 61.

  In the conventional information display panel having the above-described structure, the connection lines 65 and 66 are connected to the lead lines 53 and 56 at the two end surfaces of the panel 61 at right angles, so that the information display panel 61 is cantilevered. There was a problem that it was not possible to present it with support or to use it by binding (pinching) it like a book or notebook. In particular, if there is a size standard such as a book or a notebook, the information display area 62 of the panel 61 must be reduced due to restrictions on the overall outer shape of the panel 61, and the screen (information display area 62) is reduced. There was a problem that could not be used effectively.

  An object of the present invention is to solve the above-described problems and provide an information display panel that can be used in a single-sided manner such as a cantilever-supported presentation or a book or a notebook, and can effectively use the screen. It is what.

  The information display panel of the present invention displays a display medium by enclosing a display medium between two substrates, at least one of which is transparent, applying a voltage between electrodes provided on each substrate, and applying an electric field to the display medium. In an information display panel that displays information such as images by moving the medium, the lead lines of the display surface side electrode and the back side electrode in the display area of the panel are arranged in one direction of the panel. It is a feature.

  Also, as a preferred example of the information display panel of the present invention, the display surface side electrode and the back surface side electrode are composed of line electrodes arranged orthogonally to each other, and only the lead line of the electrode on one substrate is connected to the other side. Bring it to the board side and draw it in the same direction as the lead line of the electrode on the other board side, arrange the other lead line on both sides with respect to one lead line, in one direction A lead wire termination portion is configured at the end of the lead wire that has been arranged, and cantilever support is made possible by the lead wire termination portion, and a battery for supplying power can be replaced in the lead wire termination portion. .

  According to the present invention, the lead-out lines of the display surface side electrode and the back side electrode in the display area of the panel are arranged in one direction of the panel, so that it can be presented in a cantilevered manner, like a book or a notebook. It is possible to obtain an information display panel that can be bound on one side and can use the screen effectively.

  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. In accordance with the applied electric field direction, the charged display medium is attracted by the force of the electric field or Coulomb force, and the moving direction of the display medium is switched by the change in the electric field direction, whereby information such as an image is displayed. Therefore, it is necessary to design the information display panel so that the display medium can move uniformly and maintain the stability when the display information is rewritten or when the displayed information is continuously displayed. Here, as the force applied to the particles constituting the display medium, in addition to the force attracting each other by the Coulomb force between the particles, an electric mirror image force between the electrode and the substrate, an intermolecular force, a liquid cross-linking force, gravity and the like can be considered.

  An example of an information display panel that is a subject of the present invention will be described with reference to FIGS. 1 (a), 1 (b), 2 and 3 (a) to 3 (d).

  In the example shown in FIGS. 1A and 1B, at least two types of display media 3 (here, the display white particles 3Wa) having different optical reflectance and charging characteristics composed of at least one type of particles are used. A voltage is applied between the electrode 5 provided on the substrate 1 and the electrode 6 provided on the substrate 2 for the white display medium 3W made of the particle group and the black display medium 3B made of the display black particle 3Ba. Depending on the electric field generated, 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 visually recognized by the observer. White display. 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 FIG. 2, a display medium 3 having at least an optical reflectance and chargeability composed of at least one kind of particles (here, a white display medium 3W composed of a group of particles of display white particles 3Wa is shown). Is moved in a direction parallel to the substrates 1 and 2 in accordance with an electric field generated by applying a voltage between the electrode 5 provided on the substrate 1 and the electrode 6 provided on the substrate 2, and the white display medium 3W is moved. A white display is performed by visually recognizing the observer, or a black display is performed by allowing the observer to visually recognize the color of the color plate 7 (here, black) provided under the transparent electrode 6 on the substrate 1. Yes. In the example shown in FIG. 2, for example, a grid-like partition wall 4 is provided between the substrates 1 and 2 to form a cell. Moreover, in FIG. 2, the partition in front is abbreviate | omitted.

  FIGS. 3A to 3D are views showing still other examples of the information display panel of the present invention. In the example shown in FIG. 3A, the electrodes 5 and 6 of the display medium drive type information display panel are individual electrodes. In the example shown in FIG. 3B, the electrodes 5 and 6 of the display medium driving type information display panel are line electrodes. In the example shown in FIG. 3C, the electrodes 5 and 6 are individual electrodes, and the display medium is filled in the capsule 8 and disposed between the substrates 1 and 2. In the example shown in FIG. 3D, the electrodes 5 and 6 are individual electrodes, and the rotating ball type display medium 9 is arranged between the substrates 1 and 2. Any of the examples shown in FIGS. 3A to 3D can be suitably applied to the information display panel of the present invention.

  4 (a) to 4 (c) are diagrams for explaining the configuration of an example of the information display panel of the present invention. 4A is a view showing the state of the display surface side substrate 11, FIG. 4B is a view showing the state of the back side substrate 14, and FIG. 4C is a display surface side substrate. 11 shows a state in which the information display panel bonded to the back side substrate 14 after being turned over is viewed from the display surface side.

  First, as shown in FIG. 4A, the display surface side line electrode 12 and the lead line 13-1 following the display surface side line electrode 12 are arranged on the transparent display surface side substrate 11, and as shown in FIG. 4B. The back-side line electrode 15 and the subsequent lead line 16 are arranged on the back-side substrate 14, and the lead-out line 13-2 is arranged outside the back-side line electrode 15 on the back-side substrate 14 along with the lead line 16. Deploy. At this time, when the display surface side substrate 11 and the back side substrate 14 are overlapped, the display surface side line electrode 12 and the lead line 13-1 thereof, and the back side line electrode 15 and the lead line 16 thereof are orthogonal to each other. Arrange so that. Further, when the length of the lead line 13-1 is changed corresponding to the length of the lead line 13-2 and the display surface side substrate 11 and the back side substrate 14 are overlapped, It arrange | positions so that an edge part and the edge part of the leader line 13-2 may overlap up and down. Then, as shown in FIG. 4C, the display surface side substrate 11 and the back side substrate 14 are overlapped, and at that time, the end portion of the lead line 13-1 and the end portion of the lead line 13-2 are formed by some means. Are electrically connected vertically. Further, the connection lines 25 and 26 are connected to the lead wires 16 and 13-2 outside the information display area 22 of the panel 21 via connectors 23 and 24 at one end surface, so that the information display panel 21 is connected. It has gained.

  In the example shown in FIGS. 4A to 4C, the display surface side substrate 11 needs to be provided with a transparent electrode 12, and the electrode is formed by a transparent conductive material such as indium tin oxide (ITO). Since the electrode 15 provided on the substrate 14 does not have to be transparent, a highly conductive metal material such as aluminum or copper can be used. The lead lines 13-1, 13-2, and 16 can also be made of a conductive material such as indium tin oxide (ITO). However, the lead lines do not come out to the information display area 22, and therefore may not be transparent. A highly conductive metal material such as copper can also be used. The connection between the lead wire 13-1 pulled from one substrate side and the lead wire 13-2 formed in advance on the other substrate is made by an anisotropic conductive adhesive containing conductive particles. be able to. The lead lines 13-1, 13-2, and 16 are formed on the display surface side substrate 11 and the back side substrate 14 by a conventional patterning technique such as etching, photolithography, chemical vapor deposition, or the like. It is preferable that the wiring patterns be arranged as close as possible within a range in which adjacent wirings do not affect each other because the space of the information display area 22 can be widened. It is also preferable for the length of the wiring to be as uniform as possible in the distance to the electrode to be connected, because this reduces variation in the electrical resistance of the wiring and makes the voltage applied to the electrode uniform.

  FIGS. 5A to 5C and FIGS. 6A to 6C are diagrams for explaining the structure of another example of the information display panel of the present invention. In the example shown in FIGS. 5A to 5C and FIGS. 6A to 6C, the same members as those in the examples shown in FIGS. Description is omitted. The example shown in FIGS. 5A to 5C shows an example in which the information display area 22 of the information display panel 21 is an area that is long in the vertical direction. In the example shown in FIGS. 6A to 6C, connectors 23-1 and 23-2 and connection wiring 25 for the back side substrate 12 are provided on both sides of the connector 24 and connection wiring 26 for the display surface side substrate 11. -1 and 25-2 are shown. Any of the examples can obtain the same effect as the example shown in FIGS. 4A to 4C. In particular, in the example shown in FIGS. 5A to 5C, the information display area 22 that is long in the vertical direction. In the example shown in FIGS. 6A to 6C, the information display area 22 having a length substantially the same as the length in the width direction of the panel 21 can be secured.

  Next, an example in which the information display panel of the present invention is used as an information display board will be described with reference to FIGS. 7 to 13, the connectors 23, 23-1, 23-2, 24 and the connection wirings 25, 25-1, 25-2, 26 in the above-described embodiment are arranged on one side of the information display panel 21. This is explained as a lead wire ending portion 31 drawn out in FIG.

  In the example shown in FIG. 7, an example is shown in which the lead wire terminating portion 31 is fixed to the ceiling 32 and the information display panel 21 is cantilevered. In the example shown in FIG. 8, an example in which the lead wire terminating portion 31 is fixed to the wall 3 and the information display panel 21 is cantilevered is shown. In the example shown in FIGS. 9A and 9B, an example is shown in which the panel 34 is formed as a cover using the lead wire terminating portion 31 as a binding margin. As shown in FIG. The information display panel 21 can be protected by closing the panel 34 as shown in FIG. 9B. Further, a plurality of panels can be bound and used together.

  10 (a) and 10 (b) respectively show an example of the information display panel of the present invention as viewed from the front and from the side. In the example shown in FIGS. 10A and 10B, a battery replacement space 35 is provided for providing a replaceable battery for power supply in the lead wire termination portion 31. The information display area 22 displays a white / black advertisement. Further, in this example, in the lead wire termination portion 31, the number of lead wires shared by one connector is reduced and the number of connectors is increased. FIGS. 11 (a) to (c) and FIGS. 12 (a) to (c) respectively show modified examples of FIGS. 10 (a) to 10 (c). Reference numerals are assigned and explanations thereof are omitted. In the example shown in FIGS. 11A to 11C, an example in which the lead wire terminating portion 31 is provided on the upper portion is shown. Further, in the example shown in FIGS. 12A to 12C, the lead line termination portion 31 is provided on the side surface, and the information display area 22 is divided into the first display area 22-1 and the second display area 22-2. The first display area 22-1 is displayed in white / black using a white display medium / black display medium, and the second display area 22-2 is yellow using a yellow display medium / black display medium. / Shows an example displayed in black.

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

  As for the substrate, at least one display-side 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 the substrate material include polymer sheets such as polyethylene terephthalate, polyethylene naphthalate, polyethersulfone, polyethylene, polycarbonate, polyimide, and acrylic, metal sheets, and glass sheets. 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 forming electrodes include metals such as aluminum, silver, nickel, copper and gold, indium tin oxide (ITO), indium oxide, conductive tin oxide, antimony tin oxide (ATO), conductive Conductive metal oxides such as conductive zinc oxide, and conductive polymers such as polyaniline, polypyrrole and polythiophene are exemplified and used as appropriate. 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 a direct current or an alternating current.

The shape of the partition 4 in the case where the partition is provided on the substrate is appropriately set appropriately depending on the type of display medium involved in display, the shape and arrangement of the 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. 13, the cells formed by the partition walls made 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.

  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 pulverulent fluid exhibits a state that is so fluid that it does not form an angle of repose, which is an index indicating the fluidity of the powder. Coulomb force is generated by an electric field formed by applying a low voltage, etc. It can be easily and stably moved.
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 that can easily create a state in which a solid substance floats relatively stably as a dispersoid in a gas. .

Next, display colored particles (hereinafter also referred to as particles) constituting the display medium in the information display panel which is the subject of the present invention will be described. The colored particles for display are used as they are as a display medium by being composed of the colored particles for display as they are, or are combined with other particles to be used as a display medium, or adjusted so as to become a powder fluid.
The particles can contain a charge control agent, a colorant, an inorganic additive, and the like, as necessary, in the resin as the main component, as necessary. Examples of resins, charge control agents, colorants, and other additives will be given below.

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

  The charge control agent (CCA) is not particularly limited, but 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), quaternary Ammonium salt compounds, calixarene compounds, boron-containing compounds (benzyl acid boron complexes), nitroimidazole derivatives and the like can be mentioned. 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.
Various colored agents described above can be blended to produce colored particles for display having a desired color.

  The colored particles for display (hereinafter also referred to as “particles”) have an average particle diameter d (0.5) in the range of 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 charged amount of the colored particles for display naturally depends on the measurement conditions, but the charged amount of the colored particles for display in the information display panel is almost the same as the initial charged amount, the contact with the partition, the contact with the substrate, and the elapsed time. It was found that the saturation value of the charging behavior of colored particles for display depends on the charge decay.

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

Furthermore, when a display medium composed of colored particles for display is applied to a dry information display panel that is driven in the air space, it is important to manage the gas in the void surrounding the display medium between the substrates. Contributes to improved 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 3A to 3D, electrodes 5 and 6 (electrodes are connected to the gap between the opposing substrate 1 and substrate 2 in FIGS. In the case of being provided inside the substrate), a gas portion in contact with a so-called display medium excluding an occupied portion of the display medium 3, an occupied portion of the partition 4, and a seal portion of the information display panel is meant.
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%. 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 is a notebook computer, electronic notebook, PDA (Personal Digital Assistants), a portable information device, a display unit of a mobile device such as a mobile phone or a handy terminal, an electronic paper such as an electronic book or an electronic newspaper. , Billboards such as signboards, posters, blackboards (whiteboards), electronic desk calculators, display units for home appliances, automotive products, card display units such as point cards, IC cards, electronic advertisements, information boards, electronic POPs (Point Of) Presence, Point Of Purchase advertising), electronic price tag, electronic shelf label, electronic score, display unit of RF-ID device, as well as display unit of various electronic devices such as POS terminal, car navigation device, clock.

  The information display panel driving method according to the present invention includes a simple matrix driving display panel, a static driving display panel that does not use a switching element in the panel itself, and three thin film transistors (TFTs). Various types of information display panels such as an active matrix drive type display panel using a two-terminal switching element represented by a terminal switching element or a thin film diode (TFD) can be used.

(A), (b) is a figure which shows the structure of an example of the information display panel of this invention, respectively. It is a figure which shows the structure of the other example of the information display panel of this invention. (A)-(d) is a figure which shows the structure of the further another example of the information display panel of this invention, respectively. (A)-(c) is a figure for demonstrating the structure of an example of the information display panel of this invention, respectively. (A)-(c) is a figure for demonstrating the structure of the other example of the information display panel of this invention, respectively. (A)-(c) is a figure for demonstrating the structure of the further another example of the information display panel of this invention, respectively. It is a figure which shows an example which used the information display panel of this invention as an information display board. It is a figure which shows the other example which used the information display panel of this invention as an information display board. (A), (b) is a figure which shows the further another example which each used the information display panel of this invention as an information display board. (A), (b) is the figure which looked at the example of the information display panel of this invention from the front, and the figure seen from the side, respectively. (A), (b) is the figure which looked at the other example of the information display panel of this invention from the front, and the figure seen from the side, respectively. (A), (b) is the figure which looked at the further another example of the information display panel of this invention from the front, and the figure seen from the side, respectively. It is a figure which shows an example of the shape of the partition in the information display panel of this invention. (A)-(c) is a figure for demonstrating one structure of the conventional information display panel, respectively.

Explanation of symbols

1, 2 Substrate 3 Display medium (particle group, powder fluid)
3W White display medium 3Wa White particles for display 3B Black display medium 3Ba Black particles for display 4 Bulkhead 5, 6 Electrode 7 Color plate 8 Capsule 9 Rotating ball 11 Display surface side substrate 12 Display surface side line electrode 13, 13-1, 13 -2, 16, 16-1, 16-2 Lead line 14 Back side substrate 15 Back side line electrode 21 Information display panel 22, 22-1, 22-2 Information display area 23, 23-1, 23-2, 24 Connector 25, 25-1, 25-2, 26 Connection wiring 31 Lead wire termination part 32 Ceiling 33 Wall 34 Panel 35 Battery replacement space

Claims (5)

  A display medium is sealed between two substrates, at least one of which is transparent, a voltage is applied between electrodes provided on each substrate, and an electric field is applied to the display medium, thereby moving the display medium and information such as an image. In the information display panel for displaying the information display panel, the lead lines of the display surface side electrode and the back surface side electrode in the display area of the panel are arranged in one direction of the panel.   The electrode on the display surface side and the electrode on the back surface side are composed of line electrodes arranged orthogonally to each other, and only the lead wire of the electrode on one substrate is brought to the other substrate side, and this electrode on the other substrate side The information display panel according to claim 1, wherein the information display panel is pulled out in the same direction as the lead line.   3. The information display panel according to claim 1, wherein the other lead line is arranged on both sides with respect to one lead line.   The information according to any one of claims 1 to 3, wherein a lead wire terminating portion is formed at an end portion of the lead wire arranged in one direction, and cantilever support is enabled by the lead wire terminating portion. Display panel.   5. The information display panel according to claim 4, wherein a battery for supplying power is replaceably provided at the lead-out line terminating portion.

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