JP2008224725A - Information displaying panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information displaying panel in which conduction reliability between a transparent line electrode and an auxiliary electrode can be improved, and even when a diaphragm has a honeycomb shape or the like, the auxiliary electrode can be formed suitably for the transparent electrode. <P>SOLUTION: An information displaying panel displays information of an image or the like by sealing at least two sorts of display media composed of at least one sort of particles and having optical reflectance and chargeability in a space between two opposed substrates at least one of which is transparent, applying an electric field to the display media by giving a potential difference between counter electrodes opposed to both of the two substrates and moving the display media. In a passive matrix driving type information displaying panel, an auxiliary electrode 11 having width of 50 μm or less is formed on a portion that is not a longitudinal-direction edge of a transparent electrode 6 formed at least on the display surface side substrate. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  In the present invention, at least two kinds of display media composed of at least one kind of particles and having optical reflectivity and chargeability are encapsulated in a space between two opposing substrates, at least one of which is transparent. An information display panel that displays an information such as an image by applying an electric field to a display medium by applying a potential difference between counter electrodes provided on both sides of a substrate and moving the display medium, and a passive matrix The present invention relates to a drive-type information display panel.

Conventionally, at least two kinds of display media composed of at least one kind of particles and having optical reflectivity and chargeability are sealed in a space between two opposing substrates, at least one of which is transparent. An information display panel that displays an information such as an image by applying an electric field to a display medium by applying a potential difference between counter electrodes provided opposite to each other and moving the display medium. In order to obtain an information display panel excellent in all of the reduction in resistance of the electrodes and the entire electrode wiring, conduction reliability of the electrodes, and visibility, the information display panel is provided on at least the display surface side substrate. A technique is known in which electrode wiring with low resistance and excellent flexibility is provided in contact with the transparent line electrode at least on either the left or right edge in the longitudinal direction of the transparent line electrode. For example, see Patent Document 1).
JP 2006-162732 A

  In the conventional information display panel described above, it is necessary to hide the electrode wiring (auxiliary electrode) provided side by side with the partition wall. Therefore, the electrode wiring (auxiliary electrode) must be provided at the edge of the transparent line electrode. There is a problem that it is difficult to always keep good contact between the electrode wiring (auxiliary electrode) and the conductive reliability. In addition, when the partition wall is not along the edge of the transparent line electrode such as a honeycomb shape, or when providing one partition wall for a plurality of cells corresponding to the color filter to be arranged in the case of high resolution such as color display, Even if the electrode wiring (auxiliary electrode) is provided at the edge of the transparent line electrode, it cannot be hidden by the partition wall, and there is a problem that it is difficult to use this technique.

  The object of the present invention is to solve the above-mentioned problems and improve the conduction reliability between the transparent line electrode and the auxiliary electrode. Even when the partition wall has a honeycomb shape, the auxiliary electrode is preferably used for the transparent line electrode. An object of the present invention is to provide an information display panel that can be formed.

  The information display panel of the present invention encloses at least two kinds of display media having at least one kind of particles and having optical reflectivity and chargeability in a space between two opposing substrates, at least one of which is transparent. An information display panel that displays an information such as an image by applying an electric field to the display medium by applying a potential difference between the counter electrodes provided opposite to both of the two substrates and moving the display medium In the information display panel of the passive matrix driving system, an auxiliary electrode having a width of 50 μm or less is provided at least in a portion other than the edge in the longitudinal direction of the transparent line electrode provided on the display surface side substrate. It is what.

  As a preferred example of the information display panel of the present invention, the auxiliary electrode is provided only on the transparent line electrode arranged in the routing portion around the display surface, and the line electrode arranged in the routing portion is covered with the transparent electrode. It is formed only with an electrode, the width of the auxiliary electrode is 30 μm or less, more preferably 20 μm or less, the auxiliary electrode is provided with respect to the transparent line electrode at a different pitch, and the transparent line electrode is made of indium tin oxide ( ITO, indium zinc oxide (IZO), tin oxide (SnO), zinc oxide (ZnO) and other ceramic-based transparent electrode materials, auxiliary electrodes are copper, aluminum, gold, silver, cobalt , Chromium, nickel or an alloy mainly composed of these metals.

  According to the present invention, the conduction reliability between the transparent line electrode and the auxiliary electrode is provided by providing the auxiliary electrode having a width of 50 μm or less at substantially the center in the longitudinal direction of the transparent line electrode provided on the display surface side substrate. Even when the partition walls have a honeycomb shape or the like, an information display panel capable of suitably forming auxiliary electrodes with respect to the transparent line electrodes can be obtained.

  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 generated by a counter electrode provided on both substrates is applied to a display medium sealed in a space between two opposing substrates. In accordance with the applied electric field direction, the charged display medium is attracted by the electric field force or the Coulomb force, and the display medium is moved 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 stability when rewriting the display repeatedly or when displaying the display information continuously. Here, as the force applied to the particles constituting the display medium, in addition to the force attracting each other by the Coulomb force between the particles, an electric mirror image force between the electrode and the substrate, an intermolecular force, a liquid crosslinking force, gravity, and the like can be considered.

  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 line electrode 5 provided on the substrate 1 and the line electrode 6 provided on the substrate 2 between the line electrode 5 provided on the substrate 1 and the line electrode 6 provided on the substrate 2. Depending on the electric field generated by applying a voltage to the substrate, 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 observed. A white display is given to the user. 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.

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

  2A to 2C are diagrams for explaining an example of the arrangement of line electrodes provided on the transparent substrate of the information display panel of the present invention. Here, FIG. 2A is a partial plan view of the information display panel substrate of the present invention, and FIG. 2B is a cross-sectional view taken along line AA in FIG. In the example shown in FIGS. 2A and 2B, the information display panel according to the present invention is characterized by a transparent line made of ITO or the like provided on the transparent substrate 2 on the display surface side for performing passive matrix driving. The auxiliary electrode 11 having a width of 50 μm or less is provided at a portion of the electrode 6 that is not the longitudinal edge. In this example, the auxiliary electrode 11 is not only used as the auxiliary electrode 11a constituting the pixel electrode portion of the transparent line electrode 6 that is not the longitudinal edge, but also to the electrode constituting the continuous lead line electrode portion. Is also used as the auxiliary electrode 11b.

  In the information display panel of the present invention having the above-described configuration, the auxiliary electrode 11 is provided at a portion that is not the longitudinal edge of the transparent line electrode 6, and the entire auxiliary electrode 11 is formed on the transparent line as shown in FIG. The auxiliary electrode 11 is not necessarily provided between the transparent line electrode 6 and the substrate 2 but may be on the outermost surface side as shown in FIG. In the information display panel of the present invention having the above-described configuration, the width of the auxiliary electrode 11 is 50 μm or less, and the auxiliary electrode 11 is less than the human visual limit even if the auxiliary electrode 11 is not hidden under the partition wall. Is not visible, there is no problem in display, and good information display can be performed.

  When the transparent substrate 2 is made of a resin, cracks may occur in the transparent line electrode 6 due to bending, resulting in image defects. However, these problems are caused by providing the auxiliary electrode 11 as in the present invention. Can be eliminated. In addition, when the display surface is large, the electrode end far from the connection side may cause a defect such as a malfunction or contrast due to a voltage drop or the like. By providing 11, these problems can be eliminated.

  In the above-described example, the thinner the auxiliary electrode 11 is, the more visually it cannot be recognized. From this viewpoint, the width of the auxiliary electrode 11 is preferably 30 μm or less, and more preferably 20 μm or less. In the above-described example, the transparent line electrode 6 is a ceramic transparent electrode mainly composed of indium tin oxide (ITO), indium zinc oxide (IZO), tin oxide (SnO), zinc oxide (ZnO), and the like. When it is easy to place a crack due to bending, it is preferable that the auxiliary electrode 11 use a metal system (metal such as copper, aluminum, gold, silver, cobalt, chromium, nickel and a metal alloy containing them as a main component). Further, in the above-described example, the auxiliary electrode 11 is not only used as the auxiliary electrode 11a constituting the pixel electrode portion at the substantially central portion in the longitudinal direction of the transparent line electrode 6, but also the electrode constituting the lead line electrode portion continuous therewith. However, the same effect can be obtained even if the electrode constituting the lead line electrode is made of a metal material and the auxiliary electrode 11b is not used.

  FIG. 3 is a view for explaining the relationship between the transparent line electrode and the auxiliary electrode in the information display panel of the present invention. In the information display panel of the present invention, as long as the auxiliary electrode 11 having a width of 50 μm or less is provided at substantially the center in the longitudinal direction of the transparent line electrode 6, the relationship between the transparent line electrode 6 and the auxiliary electrode 11 is obtained. There is no particular limitation. In this regard, there is an example shown in FIG. 3 as a preferred embodiment. In the example shown in FIG. 3, the transparent line electrodes 6 are arranged at the same pitch P for the purpose of making the pixels constant. On the other hand, although the auxiliary electrode 11 is a metal-colored electrode even though it cannot be seen, if the auxiliary electrode 11 is arranged at the same pitch P as in the transparent line 6, interference such as moire may occur. Therefore, it is preferable to arrange the auxiliary electrodes 11 at different pitches, for example, as shown in FIG. 3, the auxiliary electrodes 11 are arranged with respect to the transparent line electrodes 6 with the pitch of the auxiliary electrodes 11 different from P1, P2,.

  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.

  Transparent electrode forming material is mainly composed of indium tin oxide (ITO), indium zinc oxide (IZO), indium oxide, antimony tin oxide (ATO), conductive tin oxide, conductive zinc oxide, etc. There are conductive metal oxides, etc., and as the electrode forming material or auxiliary electrode material for the back surface, metals mainly composed of aluminum, silver, nickel, copper, gold, cobalt, chromium, and alloys thereof are appropriately used. Select and use. 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. In general, a method of coating or a method of laminating a foil manufactured by rolling or electrolysis of a metal or alloy 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 4 provided on the substrate as necessary is appropriately set according to 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. 4, 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 clearness of the display state increases.
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, for example, the powder fluid used as the display medium in 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 powdery fluid is so fluid that it cannot measure the angle of repose, which is an index indicating the fluidity of the powder, and can be easily and stably moved by Coulomb force with a small electric field force. it can.
As described above, for example, the powder fluid used as the display medium in the present invention is a substance in the intermediate state between the 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, 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 preferable from the viewpoint of controlling the adhesive force with the substrate.

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

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

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

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

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

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

  The particles for display medium of the present invention (hereinafter also referred to as particles) preferably have an average particle diameter d (0.5) in the range of 1 to 20 μm and are uniform and uniform. If the average particle diameter d (0.5) is larger than this range, the display is not clear. If the average particle diameter d (0.5) is smaller than this range, the cohesive force between the particles becomes too large, which hinders movement as a display medium.

Furthermore, in the present invention, regarding the particle size distribution of each particle, the particle size distribution Span represented by the following formula is set to 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 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 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.

In addition, when applied to an information display panel in which a display medium composed of display medium particles is driven in a gas, it is important to manage the gas in the void surrounding the display medium between the substrates, thereby improving display stability. Contribute to. Specifically, it is important that the relative humidity at 25 ° C. is 60% RH or less, preferably 50% RH or less, with respect to the gas humidity in the void portion.
1A and 1B, the gap portion is defined by electrodes 5 and 6 (when electrodes are provided inside the substrate) from the portion sandwiched between the opposing substrate 1 and substrate 2, and the display medium 3. A gas portion in contact with a so-called display medium excluding an occupied portion, an occupied portion of the partition wall 4 (when a partition wall is provided), and a seal portion of the information display panel is indicated.
The gas in the gap is not limited as long as it is in the humidity region described above, but dry air, dry nitrogen, dry argon, dry helium, dry carbon dioxide, dry methane, and the like are preferable. This gas needs to be sealed in an information display panel so that the humidity is maintained, for example, filling a display medium, assembling an information display panel, etc. 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 gas 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.

  A transparent line electrode 6 made of ITO is formed on the transparent substrate 2 by sputtering, and then a stripe-shaped auxiliary electrode 11 having a width of 50 μm is formed by a photolithographic method at substantially the center in the longitudinal direction of the formed transparent line electrode 6. did. An electronic powder fluid type information display panel is produced using this substrate 2 and, for comparison, an information display panel without auxiliary electrodes (information display panel with auxiliary electrodes such as size, resolution, electrode width, etc.) The same). A bending test was performed on the information display panel of the present invention in which the auxiliary electrode was formed and the information display panel of the comparative example in which the auxiliary electrode was not formed. As a result, many line defects occurred in the information display panel of the comparative example in which the auxiliary electrode was not provided. On the other hand, in the information display panel of the present invention in which the auxiliary electrode was formed, cracks were generated in the ITO electrode, but the line defect was not caused by the action of the auxiliary electrode.

  The present invention includes notebook computers, electronic notebooks, portable information devices called PDA (Personal Digital Assistants), display units of mobile devices such as mobile phones and handy terminals, electronic books, electronic newspapers, electronic manuals (instruction manuals), etc. Electronic paper, signboards, posters, bulletin boards such as blackboards (whiteboards), electronic desk calculators, display units for home appliances, automotive supplies, 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 part of RF-ID device, information used for display part of various electronic devices such as POS terminal, car navigation device, clock, etc. It is suitably used for a display panel.

(A), (b) is a figure which shows the structure of an example of the information display panel of this invention, respectively. (A)-(c) is a figure for demonstrating an example of the line electrode arrangement | positioning provided in the transparent substrate of the information display panel of this invention, respectively. It is a figure for demonstrating the relationship between the transparent line electrode and auxiliary electrode 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

1, 2 Substrate 3 Display medium (particle group, powder fluid)
3W White display medium 3Wa White display medium particles 3B Black display medium 3Ba Black display medium particles 4 Bulkhead 5, 6 Transparent electrode 11 Auxiliary electrode

Claims (7)

  At least two kinds of display media composed of at least one kind of particles and having optical reflectivity and chargeability are encapsulated in a space between two opposing substrates, at least one of which is transparent, both of the two boards. An information display panel that displays an information such as an image by applying an electric field to a display medium by applying a potential difference between counter electrodes provided opposite to the display medium and moving the display medium. An information display panel, wherein an auxiliary electrode having a width of 50 μm or less is provided at least in a portion other than a longitudinal edge of a transparent line electrode provided on a display surface side substrate.   The information display panel according to claim 1, wherein the auxiliary electrode is provided only on the transparent line electrode arranged in the routing portion around the display surface.   3. The information display panel according to claim 2, wherein the line electrode disposed in the lead-out portion is formed of only the auxiliary electrode by flipping the transparent electrode.   The information display panel according to claim 1, wherein the auxiliary electrode has a width of 30 μm or less, more preferably 20 μm or less.   The information display panel according to claim 1, wherein the auxiliary electrodes are provided with respect to the transparent line electrodes at different pitches.   The transparent line electrode is made of a ceramic transparent electrode material mainly composed of indium tin oxide (ITO), indium zinc oxide (IZO), tin oxide (SnO), zinc oxide (ZnO), or the like. The information display panel according to claim 1.   7. The information display according to claim 1, wherein the auxiliary electrode is made of copper, aluminum, gold, silver, cobalt, chromium, nickel, or an alloy mainly composed of these metals. panel.

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