JP2007078785A - Manufacturing method for panel for information display, and display medium charging apparatus used therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for a panel for information display in which a display medium can be charged firmly and uniformly onto a substrate, and a display medium charging apparatus used therefor. <P>SOLUTION: Disclosed is the manufacturing method for the panel for information display which displays information of an image etc., by charging the display medium between two substrates at least one of which is transparent and applying an electric field to the display medium to move the display medium. When the display medium 3 is discharged from a discharge part 12 and deposited on the substrate 1, an electric charging device 14 which generates a corona discharge is arranged at a discharge part or a pipe before the discharge part to charge the display medium with a corona generated by the electric charging device. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention manufactures an information display panel that displays information such as an image by moving a display medium by enclosing the display medium between two transparent substrates and applying an electric field to the display medium. The present invention relates to a method and a display medium filling device used therefor.

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

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

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

  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 charge into the conductive particles at a constant rate, so that the stability in rewriting display information is lacking. There is also.

As one method for solving the various problems described above, a cell that is isolated from each other by a partition wall is formed after sealing a display medium between two opposing substrates, at least one of which is transparent. 2. Description of the Related Art An information display panel that displays information such as an image by applying an electric field to a display medium after the display medium is sealed therein and moving the display medium is known.
趙 Kuniaki and three others, “New Toner Display Device (I)”, July 21, 1999, Annual Meeting of the Imaging Society of Japan (83 times in total) “Japan Hardcopy'99” Proceedings, p.249-252

  When manufacturing the above-described conventional information display panel, a free-fall method using a spacer sprayer of a liquid crystal display panel is used to fill a display medium with cells formed between substrates or between substrates. However, in this case, particularly when the charge amount of the particles for the display medium is low, the deposition on the substrate is performed by gravity, so it is very time consuming and inefficient. Further, in terms of display properties, since the adhesive force with the substrate is weak, the state is disturbed by external stimuli, resulting in poor display uniformity.

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide a method for manufacturing an information display panel capable of filling a display medium firmly and uniformly on a substrate and a display medium filling apparatus used therefor. To do.

  According to a first aspect of the present invention, there is provided a method for manufacturing an information display panel, wherein a display medium is sealed between two substrates, at least one of which is transparent, and an electric field is applied to the display medium, thereby moving the display medium. In a method for manufacturing an information display panel for displaying information such as an image, a charging device that generates corona discharge in the middle of a pipe before a discharge unit or a discharge unit when a display medium is discharged from a discharge unit and deposited on a substrate is provided. The display medium is charged by a corona disposed and generated by a charging device.

  As a preferred example of the method for manufacturing the information display panel according to the first aspect of the present invention, the charging device is provided with a corona wire inside the pipe through which the display medium passes, and a high voltage is applied to the corona wire. By doing so, there is a case where a corona discharge is generated, and a charging device is provided with a corona discharger, and a high voltage is applied to the corona discharger to generate a corona discharge.

  Further, the nozzle used in the display medium filling device of the present invention is a nozzle used as a discharge unit in the above-described method for manufacturing an information display panel, and includes a charging device serving as a corona ion source. The piping in front of the discharge section used in the display medium filling apparatus is provided with a charging device serving as a corona ion source.

  Furthermore, in the method for manufacturing an information display panel according to the second aspect of the present invention, the display medium is moved by enclosing the display medium between two substrates, at least one of which is transparent, and applying an electric field to the display medium. In the method of manufacturing an information display panel that displays information such as an image, when the display medium is ejected from the ejection unit and deposited on the substrate, an air current that has generated corona discharge is flowing (during transportation and ejection). The display medium is charged by being exposed to the display medium during the subsequent movement.

  According to the first aspect of the present invention, when the display medium passes through the charge flow generated by the corona discharge, and according to the second aspect of the present invention, the corona discharge is generated in the process of passing the display medium. The display medium can be efficiently charged by blowing the ionic air flow. As a result, a display medium having a certain charge is electrostatically attached onto the substrate, so that the filling efficiency is increased, and the adhesion effect due to the mirror image force is added, so that the display is firmly and uniformly displayed on the substrate. The medium can be filled.

  First, a basic configuration of an information display panel that is an object of the manufacturing method of the present invention will be described. In the information display panel which is an object of the present invention, an electric field is applied to a display medium sealed between two opposing substrates. Along with the applied electric field direction, the charged display medium is attracted by the electric field force or Coulomb force, etc., and the display medium changes the moving direction by the electric field direction change due to the potential switching, thereby displaying information such as an image. Made. 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 cross-linking force, gravity and the like can be considered.

  An example of an information display panel which is a manufacturing method object of the present invention will be described with reference to FIGS. 1 (a) and (b) to FIGS. 3 (a) and 3 (b).

  In the example shown in FIGS. 1A and 1B, at least two 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. A white display medium 3W composed of a group of particles and a black display medium 3B composed of a particle group of black display medium particles 3Ba) are enclosed between the substrate 1 and the substrate 2, and some voltage applying means is provided between the substrates. Depending on the electric field generated by the provision, 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, in addition to the example shown in FIG. 1A, a partition 4 is provided between the substrates 1 and 2, for example, in the form of a lattice to form a cell. In addition, in FIG. 1B, the partition in front is omitted.

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

  In the example shown in FIGS. 3 (a) and 3 (b), one type of display medium 3 (here, particles of white display medium particles 3Wa) having optical reflectivity and chargeability composed of at least one type of particles. Group white display medium 3W) is moved in a direction parallel to substrates 1 and 2 in accordance with an electric field generated by applying a voltage between electrode 5 and electrode 6 provided on substrate 1; The white display medium 3W is visually recognized by the observer to display white, or the color of the electrode 6 or the substrate 1 is visually recognized by the observer to display the color of the electrode 6 or the substrate 1. In the example shown in FIG. 3B, in addition to the example shown in FIG. 3A, for example, a grid-like partition wall 4 is provided between the substrates 1 and 2 to form a cell. Moreover, in FIG.3 (b), the partition in front is abbreviate | omitted.

  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, a nozzle 12 as a discharge unit for the display medium 3 is provided in the upper portion of the container 11, and the substrate 1 (or the substrate 1 in which cells are formed by the partition walls 4) is disposed in the lower portion of the container 11. . Note that 13 is a pipe for supplying the display medium 3 to the nozzle 12, and 15 is a feeder for sending the display medium 3 through the pipe 13. In the above-described example, the display medium 3 supplied through the pipe 13 is ejected from the nozzle 12 and deposited on the substrate 1, whereby the display medium 3 is placed on the substrate 1 (in the example in which cells are provided, the cell on the substrate 1 is placed). Inside). For example, when using two types of display media 3 of white display medium 3W and black display medium 3B as the display medium 3 to be filled, the above filling process is repeated twice for white display medium 3W and black display medium 3B. Two color display media can be filled.

  The feature of the first invention of the present invention is that corona discharge is generated in the nozzle 12 or the pipe 13 in front of the discharge section when the display medium 3 is filled on the substrate 1 or in the cells formed on the substrate 1. The charging device 14 is arranged, and the display medium 3 is charged by the corona generated by the charging device 14.

  5 (a) and 5 (b) are views showing the configuration of an example of a charging device used in the method for manufacturing an information display panel according to the first invention of the present invention. In each of the examples shown in FIGS. 5A and 5B, a charging device 14 is provided in which a corona wire 22 is disposed inside a resin tube 21 at the tip of a nozzle 12 serving as a display medium discharge unit. By applying a high voltage from the power supply 16 to the corona wire 22, the charging device 14 generates corona discharge. The display medium 3 is charged by passing through the charge flow generated by the corona discharge.

  In the example shown in FIGS. 5A and 5B, the high voltage applied from the power supply 16 to the corona wire 22 may be a high voltage sufficient to generate air discharge, and is usually 1 kV or higher. It is with voltage. Here, in the example shown in FIG. 5A, the corona wire 22 is provided near the middle of the resin tube 21 so that the display medium 3 is charged during conveyance. On the other hand, in the example shown in FIG. 5B, the corona wire 22 is provided so as to protrude from the tip of the resin tube 21 away from the tip of the nozzle 22 so that the display medium 3 is charged after being discharged from the nozzle 22. Yes.

  FIG. 6 is a view showing the structure of another example of the charging apparatus used in the method for manufacturing the information display panel according to the first aspect of the present invention. In the example shown in FIG. 6, a charging device 14 formed of a corona discharger such as a scorotron discharger is provided in the vicinity of the discharge port of the nozzle 12 serving as a display medium discharge unit, and a high voltage is applied from the power supply 16 to the charging device 14. Is applied to cause the charging device 14 to generate corona discharge. As in the example shown in FIGS. 5A and 5B, the display medium 3 is charged by passing the display medium 3 through the charge flow generated by the corona discharger.

  FIGS. 7A to 7C are views showing an example of a method for manufacturing an information display panel according to the second invention of the present invention. In the second invention of the present invention shown in FIGS. 7 (a) to 7 (c), display is performed by exposing the air flow that has generated corona discharge to a display medium that is flowing (during conveyance and moving after discharge). Charge the medium. In the examples shown in FIGS. 7A to 7C, as the configuration for that purpose, in all cases, an ionic airflow that has been subjected to corona discharge by the corona airflow generation and supply device 31 to which a high voltage is applied from the power supply 16 is connected to the pipe 32. It is configured to be exposed to the display medium by blowing into a predetermined portion of the filling device via the. In addition, as the corona airflow generation supply device 31, a powder coating gun used for spraying the powder coating can be suitably used.

  In the example shown in FIG. 7A, the pipe 32 is connected to a hood 33 provided at the tip of the nozzle 12, and a corona discharge generated air current is supplied and exposed in the hood 33, thereby moving after discharge. The display medium is charged. In the example shown in FIG. 7B, the pipe 32 is connected to the pipe 13 between the nozzle 12 and the feeder 15, and the air flow that has generated corona discharge is supplied and exposed in the pipe 13 to be conveyed. The display medium is charged. In the example shown in FIG. 7C, the display medium is charged before conveyance by connecting the pipe 32 to the feeder 15 and supplying and exposing an airflow that has generated corona discharge in the feeder 15. In any example, the second invention of the present invention can be suitably implemented.

  Hereinafter, each member which comprises the information display panel used as the object 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 3 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 1 may be transparent or opaque. Examples of substrate materials include polymer sheets such as polyethylene terephthalate, polyethylene naphthalate, polyethersulfone, polyethylene, polycarbonate, polyimide, and acrylic, flexible materials such as metal sheets, and glass and quartz. An inorganic sheet having no flexibility is mentioned. The thickness of the substrate is preferably from 2 to 5000 μm, more preferably from 5 to 2000 μm. If it is too thin, it will be difficult to maintain the strength and the spacing uniformity between the substrates, and if it is thicker than 5000 μm, it will be a thin information display panel. Is inconvenient.

  Electrode forming materials for 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. The electrode can be formed by patterning the above-described materials into a thin film by sputtering, vacuum deposition, CVD (chemical vapor deposition), coating, or the like, or by mixing a conductive agent with a solvent or synthetic resin binder. A method of applying and patterning is used. The electrode provided on the viewing side (display surface 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 display surface side substrate described above, but need not be transparent. In this case, the external voltage input may be superimposed with direct current or alternating current.

The shape of the partition walls 4 provided on the substrate as required is appropriately set appropriately depending on the type of display medium involved in display, the shape and arrangement of electrodes to be arranged, and is not limited in general. The height of the partition is adjusted to 100 to 100 μm, preferably 3 to 50 μm, and the height of the partition wall to 10 to 100 μm, preferably 10 to 50 μm.
In forming the partition wall, a both-rib method in which ribs are formed on each of the opposing substrates 1 and 2 and then bonded, and a single-rib method in which ribs are formed only on one substrate are conceivable. In the present invention, any method is preferably used.
As shown in FIG. 8, 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 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, 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 used as they are as they are, which are composed of the display medium particles alone or in combination with other particles as a display medium. 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.

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

Furthermore, in the present invention, regarding the particle size distribution of each particle, the particle size distribution Span represented by the following formula is less than 5, preferably less than 3.
Span = (d (0.9) −d (0.1)) / d (0.5)
(However, d (0.5) is a numerical value expressing the particle diameter in μm that 50% of the particles are larger than this and 50% is smaller than this, and d (0.1) is a particle in which the ratio of the smaller particles is 10%. (Numerical value expressed in μm, and d (0.9) is a numerical value expressed in μm for a particle diameter of 90% or less.)
By keeping Span within a range of 5 or less, the size of each particle is uniform, and uniform display medium movement 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, put particles into a nitrogen stream and use the attached analysis software (software based on volume-based distribution using Mie theory). The diameter and particle size distribution can be measured.

  The charge amount of the display medium particles naturally depends on the measurement conditions, but the charge amount of the display medium particles in the information display panel is almost the same as the initial charge amount, the contact with the partition walls, the contact with the substrate, and the elapsed time. It was found that depending on the charge decay, the saturation value of the charging behavior of the particles for the display medium is a dominant factor.

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

Furthermore, when a display medium such as a particle group composed of particles for a display medium is applied to a dry information display panel, it is important to manage the gas in the voids surrounding the display medium between the substrates, and display stability. Contributes to improvement. 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, 3B, 3B, and 3B, the gaps are defined as electrodes 5 and 6 (electrodes on the inner side of the substrate). In other words, the gas portion in contact with the so-called display medium excluding the occupied portion of the display medium 3, the occupied portion of the partition wall 4, and the 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 that is the subject of the present invention is not limited as long as the display medium can be moved and the contrast can be maintained, but is usually adjusted to 10 to 500 μm, preferably 10 to 200 μm.
The volume occupation ratio of the display medium in the space between the opposing substrates is preferably 5 to 70%, more preferably 5 to 60%. When it exceeds 70%, the movement of the display medium is hindered, and when it is less than 5%, the contrast tends to be unclear.

  An information display panel subject to the present invention is a display unit of a mobile device such as a notebook computer, PDA, mobile phone, handy terminal, electronic paper such as an electronic book or an electronic newspaper, a signboard, a poster, a bulletin board such as a blackboard, a calculator Appropriately used for display units for home appliances, automobiles, etc., card display units for point cards, IC cards, etc., electronic advertisements, electronic POPs, electronic price tags, electronic shelf labels, electronic musical scores, display units for RF-ID devices, etc. It is done.

(A), (b) is a figure which shows an example of the information display panel used as the object of this invention, respectively. (A), (b) is a figure which shows the other example of the information display panel used as the object of this invention, respectively. (A), (b) is a figure which shows the further another example of the information display panel used as the object of this invention, respectively. It is a figure for demonstrating an example of the manufacturing method of the information display panel of this invention. (A), (b) is a figure which shows the structure of an example of the charging device used for the manufacturing method of the information display panel which concerns on 1st invention of this invention, respectively. It is a figure which shows the structure of the other example of the charging device used for the manufacturing method of the information display panel which concerns on 1st invention of this invention. (A)-(c) is a figure which shows an example of the manufacturing method of the information display panel which concerns on 2nd invention of this invention, respectively. 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)
3W White display medium 3Wa White display medium particle 3B Black display medium 3Ba Black display medium particle 4 Bulkhead 5, 6 Electrode 11 Container 12 Nozzle 13 Pipe 14 Charging device 15 Feeder 16 Power supply 21 Resin tube 22 Corona wire 31 Corona air flow generation supply Equipment 32 Piping 33 Hood

Claims (6)

  In a method for manufacturing an information display panel in which a display medium is sealed between two transparent substrates and an electric field is applied to the display medium to display information such as an image by moving the display medium. When discharging the medium from the discharge unit and depositing it on the substrate, a charging device that generates corona discharge is arranged in the middle of the discharge unit or the pipe before the discharge unit, and the display medium is charged by the corona generated by the charging device. A method of manufacturing a characteristic information display panel.   2. The information display panel according to claim 1, wherein the charging device includes a corona wire disposed in a pipe through which the display medium passes, and a corona discharge is generated by applying a high voltage to the corona wire. Manufacturing method.   2. The method for manufacturing an information display panel according to claim 1, wherein the charging device includes a corona discharger, and a corona discharge is generated by applying a high voltage thereto.   A display medium filling device, wherein a nozzle used as a discharge unit in the method for manufacturing an information display panel according to claim 1 includes a charging device that generates corona discharge.   The display medium filling device, wherein the piping before the discharge section in the method for manufacturing an information display panel according to any one of claims 1 to 3 includes a charging device that generates corona discharge.   In a method for manufacturing an information display panel in which a display medium is sealed between two transparent substrates and an electric field is applied to the display medium to display information such as an image by moving the display medium. When the medium is ejected from the ejection part and deposited on the substrate, the display medium is charged by exposing the air current that has generated corona discharge to the display medium that is flowing (moving and moving after ejection). A method for manufacturing an information display panel characterized by the above.

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