JP2006065314A - Method for manufacturing information display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing an information display panel by which no display medium remains on a barrier wall top when two substrates are laminated and a cell can be reliably filled with a predetermined amount of the display medium. <P>SOLUTION: The method for manufacturing an information display panel includes steps of forming a plurality of cells 11 segmented by barrier walls 4 between two substrates 1, 2 opposing to each other at least one of which is transparent, sealing a display medium 3 in the cells, and applying an electric field on the display medium to move the display medium to display information such as an image, wherein in the step of filling the cell 11 with the display medium 3, the cell 11 is filled with a dispersion liquid 13 prepared by dispersing the display medium 3 in a dispersion medium 12 comprising a liquid. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention provides a display by forming a plurality of cells partitioned by a partition wall between two opposing substrates at least one of which is transparent, enclosing a display medium in the cell, and applying an electric field to the display medium. The present invention relates to a method for manufacturing an information display panel that displays information such as images by moving a medium.

  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 image display for mobile terminals, electronic paper, and the like. Particularly recently, an electrophoretic method in which a dispersion liquid composed of dispersed particles and a colored solution is encapsulated and disposed between opposing substrates has been proposed and is expected.

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

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

As one method for solving the various problems described above, a cell separated from each other by a partition is formed between two opposing substrates, at least one of which is transparent, and a display medium is sealed in the cell. 2. Description of the Related Art An information display panel that displays an information such as an image by applying an electric field to a medium and moving the display medium is known.
趙 Kuniori 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, when the display medium is filled and arranged in the cells partitioned by the partition walls, the display medium to be filled and arranged in the cells is sprayed and filled from above the substrate on which the cells are provided. Alternatively, a method has been employed in which a display medium to be filled in a substrate provided with a cell is placed on a heap and filled into the cell so as to be scraped off while being spread with a spatula or the like. However, the spraying method has a problem that the display medium deposited on the top of the partition wall enters the gap between the substrate and the partition wall when the two substrates are overlapped. Further, the abrasion method has a problem that the amount of display medium to be filled in the cell cannot be controlled.

  The object of the present invention is to eliminate the above-mentioned problems, and there is no display medium remaining on the top of the partition wall when two substrates are overlapped, and a predetermined amount of display medium can be reliably filled in the cell. An object of the present invention is to provide a method for manufacturing an information display panel.

  In the method for manufacturing an information display panel according to the present invention, a plurality of cells partitioned by a partition are formed between two opposing substrates, at least one of which is transparent, and the display medium is enclosed in the cells. In a method for manufacturing an information display panel that displays information such as images by moving the display medium by applying an electric field, the display medium is dispersed in a liquid dispersion medium when the display medium is filled in the cells. The dispersion liquid is filled in the cell.

  As a preferred example of the method for producing the information display panel of the present invention, when filling the display medium in the cell, the dispersion liquid is dropped and filled into the cell partitioned by the partition on the substrate, and then filled into the cell. The dispersion liquid is dried to remove the dispersion medium, the substrate is vibrated when the dispersion liquid is dropped and filled, the substrate is vibrated after the dispersion medium is removed by drying or the opposite substrate is bonded, display Controlling the filling rate of the medium by any one of the concentration of the dispersion, the amount of dripping, and the number of times of dripping, the dispersion medium is alcohol such as ethanol, methanol, propanol, isopropanol, butanol, water, acetone, and their It is a mixture and the display medium is a particle group or a powder fluid.

  In the present invention, when the display medium is filled in the cell, the display medium remaining in the top of the partition wall when the two substrates are overlapped by filling the cell with a dispersion liquid in which the display medium is dispersed in the dispersion medium liquid. It is possible to obtain a method for manufacturing an information display panel that has no medium and can reliably fill a predetermined amount of display medium in a cell.

  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 charging display medium (particle group or powder fluid) sealed between two opposing substrates. The display medium charged along the applied electric field direction is attracted by the electric field force, the Coulomb force, or the like, and the display medium reciprocates due to the change in the electric field direction due to the potential switching, thereby displaying an image. Therefore, it is necessary to design the information display panel so that the display medium can move uniformly and maintain stability during repetition or storage. Here, the force applied to the particles or powdered fluid used as the display medium is not only the force attracted by the Coulomb force between the particles or powdered fluid, but also the image power, intermolecular force, liquid crosslinking force with the electrode and the substrate, Gravity is considered.

An example of the information display panel of the present invention will be described with reference to FIGS.
In the example shown in FIG. 1, two or more kinds of display media 3 having different colors (here, the white particle group 3W and the black particle group 3B) are applied to the substrate 1 according to the electric field applied from the outside of the substrates 1 and 2. 2, the black particle group 3 </ b> B is visually recognized by the observer and black display is performed, or the white particle group 3 </ b> W is visually recognized by the observer and white display is performed. A partition 4 is provided between the substrates 1 and 2 in a lattice shape, for example, to form a cell.
In the example shown in FIG. 2, two or more kinds of display media 3 having different colors (here, the white particle group 3W and the black particle group 3B are shown), the electrode 5 provided on the substrate 1, the electrode 6 provided on the substrate 2, In accordance with the electric field generated by applying a voltage between them, the substrate is moved perpendicularly to the substrates 1 and 2 and the black particle group 3B is visually recognized by the observer to display black, or the white particle group 3W. Is displayed in white by the observer. For example, a partition 4 is provided between the substrates 1 and 2 in a lattice shape to form a cell.
In the example shown in FIG. 3, an electric field generated by applying a voltage between the electrode 5 and the electrode 6 provided on the substrate 1 to the display medium 3 of one color (here, the white particle group 3 </ b> W). Accordingly, the white particles 3W are moved in a direction parallel to the substrates 1 and 2 so that the observer can visually recognize the white particles 3W, or the color of the electrode 6 or the substrate 1 is visually recognized by the observer. The color of the substrate 1 is displayed. For example, a partition 4 is provided between the substrates 1 and 2 in a lattice shape to form a cell.
The above description can be similarly applied to the case where the white particle group 3W is replaced with a white powder fluid and the black particle group 3B is replaced with a black powder fluid.

  The feature of the method for producing an information display panel according to the present invention is that when a display medium (particle group or powdered fluid) is filled in a cell, it is handled in the state of a dispersion. That is, a dispersion liquid in which a display medium is dispersed in a liquid dispersion medium is filled in a cell. Then, by removing the dispersion medium from the dispersion liquid filled in the cell, only the display medium is filled in the cell. This dispersion medium needs to be easy to disperse the display medium and to be easily removed after filling the cell. As a method of filling the dispersion liquid into the cell, any method other than the conventionally known abrasion method, printing method, and coating method can be used. For example, the barrier ribs are used when manufacturing a plasma display panel (PDP). As a method of applying the luminescent paint droplets by the “inkjet method”, which is known as a method of applying the luminescent paint to the region partitioned by (1), a method of using a dispersion liquid of the display medium instead of the luminescent paint can be adopted. Use of this method is preferable because the liquid can be surely filled into the finely divided cells, and the filling rate of the display medium can be controlled by any one of the concentration of the dispersion, the amount of dripping, and the number of times of dripping.

  FIG. 4 is a diagram for explaining an example of a method for manufacturing an information display panel according to the present invention. In the example shown in FIG. 4, when the display medium 3 (particle group or powder fluid) is filled in the cell 11, the dispersion liquid 13 in which the display medium 3 is dispersed in the dispersion medium 12 made of liquid is supplied as microdroplets. The apparatus 14 is used to drop-fill the cells 11 partitioned by the partition walls 4 on the substrate. In this example, a dispersion liquid 13 in which all the display media 3 to be filled in the cells 11 are dispersed may be prepared. In the case of a plurality of types of display media 3 that cannot be dispersed by the same dispersion medium 12, What is necessary is just to prepare the dispersion liquid 13 which disperse | distributed each display medium 3 using the dispersion medium for display media 3. FIG.

  The particle group or powder fluid used as the display medium 3 has a chargeability in a dry state, and the liquid used as the dispersion medium 12 does not dissolve the display medium 3, does not swell, or does not change in quality. Those that do not impair the charging ability of the medium 3 during drying are preferred. Specifically, as the dispersion medium 12 made of a liquid, alcohols such as ethanol, methanol, propanol, isopropanol, and butanol, water, acetone, and a mixture thereof are used. From the viewpoint of good dry-removability after filling in the cell 11 and environmental hygiene, ethanol and ethanol / water mixture are preferably used. The dispersion medium 12 is preferably dispersed by using a device such as a homogenizer because the dispersion stability is improved.

  In addition, when the dispersion liquid 13 is dropped and filled into the cell 11, it is preferable to give vibration to the substrate. Moreover, it is preferable to apply vibration to the substrate after the dispersion medium 12 is dried and removed or after the counter substrate is bonded. The reason is as follows. That is, when the dispersion liquid is dropped and filled or the dispersion liquid of the display medium is dried, the display media tend to agglomerate, and it takes time until the display medium is driven satisfactorily, or the display medium does not decompose or decompose. It causes display failure. By giving vibration to the substrate, the display medium is prevented from agglomerating at the time of dripping and drying, and even if it agglomerates, it can be easily disintegrated, so that the display substrate is in a state of being fully decomposed and disassembled. Filling in between, good display performance is obtained.

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

  As for the substrate, at least one of the substrates is the transparent substrate 1 from which the color of the display medium can be confirmed from the outside of the panel, and a material having high visible light transmittance and good heat resistance is preferable. The substrate 2 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 electrodes provided as necessary include metals such as aluminum, silver, nickel, copper, and gold, conductive metal oxides such as ITO, indium oxide, conductive tin oxide, and conductive zinc oxide, polyaniline , Conductive polymers such as polypyrrole and polythiophene are exemplified, and are 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 viewing side substrate needs to be transparent, but the electrode provided on the back side substrate does not need to be transparent. In any case, the above-mentioned material that is conductive and capable of pattern formation 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 are the same as those of the electrode provided on the viewing 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 is optimally set according to the type of display medium involved in the display and is not limited in general. However, the width of the partition is 2 to 100 μm, preferably 3 to 50 μm, and the height of the partition is 10 to 10 μm. The thickness is adjusted to 500 μm, preferably 10 to 200 μm. In forming the partition walls, a both-rib method in which ribs are formed on each of the opposing substrates and then bonded, and a one-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 of these ribs are exemplified by a square shape, a triangular shape, a line shape, a circular shape, and a hexagonal shape as viewed from the plane of the substrate. 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 state becomes clearer. Here, 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. Among these, a photolithography method using a resist film and a mold transfer method are preferably used. In any method, the present invention can be suitably used.

  Next, the powder fluid as a display medium used in the information display panel of the present invention will be described. In addition, about the name of the powder fluid as a display medium of this invention, the present applicant has acquired the right of "electronic powder fluid (registered trademark)".

  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 that exhibits high fluidity in an aerosol state in which solid particles are stably suspended as a dispersoid, for example, as a display medium, between opposing substrates, at least one of which is transparent. Such a powder fluid can be easily and stably moved by a Coulomb force or the like by applying a low voltage.
As described above, for example, the powder fluid used in the present invention is a substance in an intermediate state between fluid and particles, which exhibits fluidity by itself without borrowing the force of gas or liquid. This powder fluid can be in an aerosol state in particular, and in the information display panel of the present invention, a solid substance is used in a state of relatively stably floating as a dispersoid in the gas.

  Next, the particle | grains as a display medium used with the information display panel of this invention are demonstrated. The particles can contain a charge control agent, a colorant, an inorganic additive, and the like, if necessary, in the resin as the main component, as in the conventional case. Examples of resins, charge control agents, colorants, and other additives will be given below.

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

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

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

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

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

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

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

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

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 indicating 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 size of 90% or less.)
By keeping Span within a range of 5 or less, the size of each particle is uniform and uniform particle movement is 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.

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 naturally depends on the measurement conditions, but the charge amount of the display medium in the information display panel almost depends on the initial charge amount, the contact with the partition wall, the contact with the substrate, and the charge decay with the elapsed time. In particular, it was found that the saturation value of the charging behavior of the display medium is a dominant factor.

Furthermore, in the present invention, when a powder fluid or a particle group is used as the display medium, it is important to manage the gas in the voids 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, preferably 50% RH or less, more preferably 35% RH or less with respect to the humidity of the gas in the gap.
1 to 3, electrodes 5 and 6 (when electrodes are provided inside the substrate), display medium 3 (particle group or powdered fluid) from the portion sandwiched between the opposing substrates 1 and 2 in FIGS. ), The occupied portion of the partition wall 4, and the information display panel seal portion, the gas portion in contact with the so-called display medium 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 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. In the present invention, after the display medium dispersion liquid is filled, the amount of the display medium remaining after drying and removing the liquid as the dispersion medium is controlled to be a predetermined amount within the above range.

<Example 1>
Two types of display media (particle groups) mixed at a predetermined ratio were dispersed in ethanol, and this dispersion was dropped into a cell provided between the substrates, and the dispersion medium was removed by drying. The counter substrate was bonded to this substrate, and ultrasonic vibration was applied. A display medium (particle group) filled by applying a voltage of (100 V, 10 Hz) to this panel was driven to confirm the display performance of the panel. The panel to which ultrasonic waves were applied after bonding the counter substrate showed good display performance.

<Comparative Example 1>
A voltage of (100 V, 10 Hz) was applied to the panel produced in the same manner as in Example 1 except that no ultrasonic vibration was applied, and the display performance was confirmed. The agglomerated display medium (particle group) was not charged and decomposed and the cells that were not sufficiently disintegrated were so-called dot missing, and the display performance was insufficient.

<Example 2>
Two types of display media (particle groups) mixed at a predetermined ratio were dispersed in ethanol, and this dispersion was dropped into a cell provided between the substrates, and the dispersion medium was removed by drying. Ultrasonic vibration was applied to the substrate during the drying process. A counter substrate was bonded to this substrate to produce a panel, and a display medium (particle group) filled by applying a voltage of (100 V, 10 Hz) to this panel was driven to confirm the display performance of the panel. The panel which gave ultrasonic vibration to the substrate during the drying process of removing the dispersion medium showed good display performance.

  The information display panel obtained by the manufacturing method of the present invention is a display unit for mobile devices such as notebook computers, PDAs, mobile phones, handy terminals, electronic papers such as electronic books and electronic newspapers, bulletin boards such as signboards, posters, and blackboards. Suitable for display units such as calculators, home appliances, car supplies, card display units such as point cards and IC cards, electronic advertisements, electronic POPs, electronic price tags, electronic shelf labels, electronic musical scores, and display units for RF-ID devices Used for.

It is a figure which shows an example of the information display panel used as the object of this invention. It is a figure which shows the other example of the information display panel used as the object of this invention. It is a figure which shows the further another example of the information display panel used as the object of this invention. It is a figure for demonstrating an example of the manufacturing method of the information display panel of this invention. It is a figure which shows an example of the shape of the partition in the information display panel used as the object of this invention.

Explanation of symbols

1, 2 Substrate 3 Display medium (particle group or powder fluid)
3W white particles (white powder fluid)
3B Black particle group (black powder fluid)
4 Partition 5, 6 Electrode 11 Cell 12 Dispersion medium 13 Dispersion 14 Micro droplet supply device

Claims (7)

  A plurality of cells partitioned by partition walls are formed between two opposing substrates, at least one of which is transparent, the display medium is enclosed in the cells, and an electric field is applied to the display medium, thereby moving the display medium. In the method of manufacturing an information display panel that displays information such as images, the cell is filled with a dispersion liquid in which the display medium is dispersed in a dispersion medium made of liquid. A manufacturing method of a characteristic information display panel   When filling the display medium in the cell, the dispersion liquid is dropped and filled into the cell partitioned by the partition on the substrate, and then the dispersion liquid filled in the cell is dried to remove the dispersion medium. The method for manufacturing an information display panel according to claim 1.   3. The method for manufacturing an information display panel according to claim 2, wherein the substrate is vibrated when the dispersion liquid is dropped and filled.   4. The method for manufacturing an information display panel according to claim 2, wherein the substrate is vibrated after the dispersion medium is removed by drying or the counter substrate is bonded.   The method for manufacturing an information display panel according to claim 1, wherein the filling rate of the display medium is controlled by any one of the concentration of the dispersion, the amount of dripping, and the number of times of dripping.   6. The information display panel according to claim 1, wherein the dispersion medium is an alcohol such as ethanol, methanol, propanol, isopropanol, or butanol, water, acetone, or a mixture thereof. Manufacturing method.   The method for producing an information display panel according to claim 1, wherein the display medium is a particle group or a powder fluid.

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