JP2007322784A - Information display panel and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information display panel which can simplify processes, can suppress the damage of a transparent electrode, can be suitably used for a film substrate and can improve durability, and to provide its manufacturing tmethod. <P>SOLUTION: The information display panel displays information such as an image by sealing a display medium between two substrates and applying a voltage between electrodes to move the display medium; wherein a transparent substrate 2 in the observation side is composed of a film substrate, a transparent electrode 6 is formed on the film substrate surface that is an inner surface opposing to the back side substrate, color filters 12R, 12B, 12G of the respective colors are formed on the outside surface corresponding to the transparent electrode, and a protective film 13 is formed on the color filters. The manufacturing steps comprise steps of: forming the transparent electrode on one surface of the transparent substrate; forming the color filters on the other surface of the transparent substrate; and laminating the protective film on the color filters. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

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

Conventionally, a liquid crystal display using a color filter for colorization of the liquid crystal display is known (see, for example, Patent Document 1).
JP 2003-279719 A

  7A to 7E are diagrams for explaining an example of a color filter forming method in a conventional liquid crystal display. A method for forming a color filter in a conventional liquid crystal display will be described with reference to FIGS. 7A to 7E. First, as shown in FIG. 7A, a transparent substrate 51 is prepared. Next, as shown in FIG. 7B, color filter processing is performed using a photolithographic method, an ink jet method, or the like to continuously form the color filter layers 52R, 52G, and 52B. Next, as shown in FIG. 7C, a flat layer 53 is formed by performing a flattening process on the color filter layers 52R, 52G, and 52B. Next, as shown in FIG. 7D, a transparent electrode made of ITO or the like is formed on the flat layer 53. Finally, as shown in FIG. 7E, each of the different electrodes 54 is formed by patterning corresponding to each of the color filter layers 52R, 52G, and 52B. As described above, conventionally, the color filter layers 52R, 52G, and 52B and the transparent electrode 54 are formed on the transparent substrate 51 on the observation side.

  In the configuration of the conventional liquid crystal display described above, since it is necessary to form the transparent electrode 54 after processing the color filter layers 52R, 52G, and 52B, the transparent electrode 54 is processed after processing the color filter layers 52R, 52G, and 52B. There is a problem that the transparent electrode 54 is easily affected in addition to a complicated process. In addition, in the configuration of the conventional liquid crystal display described above, a temperature of, for example, 200 ° C. or higher is usually required in order to cure and form the color filter layers 52R, 52G, and 52B that are patterned using a photolithography method or the like. If the transparent substrate 1 is a glass substrate, there is no problem. However, if the transparent substrate 1 is made of a film substrate made of resin or the like, the film substrate cannot withstand high-temperature processing. There is also a problem that cannot be used for forming color filters.

  The object of the present invention is to solve the above-mentioned problems, simplify the process, suppress the damage of the transparent electrode, can be suitably used for the film substrate, and improve the durability. It is an object of the present invention to provide an information display panel that can be used and a manufacturing method thereof.

  The information display panel of the present invention displays a display medium by enclosing a display medium between two substrates, at least one of which is transparent, applying a voltage between electrodes provided on each substrate, and applying an electric field to the display medium. In an information display panel that displays information such as images by moving a medium, the transparent substrate on the observation side is composed of a film substrate, and this transparent film substrate surface is transparent on the inner surface facing the back substrate. An electrode is formed, a color filter of each color is formed at a position corresponding to the transparent electrode on the outer surface of the film substrate, and a protective film is formed on the color filter.

  As a preferred example of the information display panel of the present invention, the film substrate may be made of resin.

  Further, the information display panel manufacturing method of the present invention is a method for manufacturing an information display panel having the above-described configuration, in forming a transparent electrode, a color filter and a protective film on a transparent substrate on the observation side. Forming a transparent substrate on the surface of the substrate, patterning the transparent substrate, forming a color filter on the other surface of the transparent substrate, and laminating a protective film on the color filter. It is characterized by.

  According to the present invention, the transparent substrate on the observation side is formed of a film substrate, the transparent electrode is formed on the inner surface facing the substrate on the back side of the film substrate, and the transparent surface is formed on the outer surface of the film substrate. A process of forming a color filter for each color at a corresponding position and forming a protective film on the color filter by patterning the transparent substrate on one surface of the transparent substrate, and after patterning the transparent substrate, the transparent substrate By forming from the process of forming a color filter on the other surface of the film and the process of laminating a protective film on the color filter, the process can be simplified, damage to the transparent electrode can be suppressed, and the film substrate can be suppressed. It is possible to obtain an information display panel that can be suitably used and that can improve durability and a method for manufacturing the same.

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

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

  In the example shown in FIGS. 1A and 1B, at least two types of display media 3 (here, the display white particles 3Wa) having different optical reflectance and charging characteristics composed of at least one type of particles are used. A voltage is applied between the electrode 5 provided on the substrate 1 and the electrode 6 provided on the substrate 2 for the white display medium 3W made of the particle group and the black display medium 3B made of the display black particle 3Ba. Depending on the electric field generated, the substrate is moved perpendicularly to the substrates 1 and 2 so that the black display medium 3B is visually recognized by the observer and black display is performed, or the white display medium 3W is visually recognized by the observer. White display. In the example shown in FIG. 1B, for example, a partition 4 is provided in a lattice shape between the substrates 1 and 2 to form cells. In addition, in FIG. 1B, the partition in front is omitted.

  In the example shown in FIG. 2, a display medium 3 having at least an optical reflectance and chargeability composed of at least one kind of particles (here, a white display medium 3W composed of a group of particles of display white particles 3Wa is shown). Is moved in a diagonal direction perpendicular to the substrates 1 and 2 in accordance with the electric field generated by applying a voltage between the electrode 5 provided on the substrate 1 and the electrode 6 provided on the substrate 2, and the white display medium 3W The viewer can visually recognize the white color, or the substrate 1 can display the color of the color plate 7 (here, black) provided under the transparent electrode 6 and the black color. ing. In the example shown in FIG. 2, for example, a grid-like partition wall 4 is provided between the substrates 1 and 2 to form a cell. Moreover, in FIG. 2, the partition in front is abbreviate | omitted.

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

  The above description applies in the same manner to the case where the white display medium 3W including the particle group is replaced with the white 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.

  FIG. 4 is a view for explaining an example of the information display panel of the present invention. The example shown in FIG. 4 shows an example in which one pixel is configured from three cells 11 each partitioned by a partition wall 4, and three primary color transparent color filters 12 R, 12 G, and 12 B are provided in the three cells 11, respectively. In the transparent substrate 2 on the display surface side, the transparent color filters 12R, 12G, and 12B are provided corresponding to the transparent electrodes 6, respectively. Further, in order to protect the transparent color filters 12R, 12G, and 12B and improve the functionality, a protective film 13 having high weather resistance and damage resistance is laminated on the surface of the transparent color filters 12R, 12G, and 12B. ing. In this example, an electric field is generated by applying a voltage between the electrodes 5 and 6, and color display is performed by moving the display media 3W and 3B according to the electric field. In the case of color display, a unit (unit cell) in which three cells having three primary color filters are arranged as one set is a pixel unit, and independent display medium movement is performed for each pixel included in the pixel unit. Thus, color display can be performed by combining three colors obtained through the color filter.

  The information display panel of the present invention is characterized in that, in the information display panel of FIG. 4, the observation-side transparent substrate 2 is preferably a film substrate made of resin, and is the surface of the transparent film substrate 2 on the back side. The transparent electrode 6 is formed on the inner surface facing the substrate 1, and the color filters 12R, 12G, and 12B for the respective colors are formed on the outer surface of the transparent substrate 2 made of the film substrate at positions corresponding to the transparent electrode 6. In addition, the protective film 13 is formed on the color filters 12R, 12G, and 12B.

  FIGS. 5A to 5D are diagrams for explaining an example of a color filter forming method in the method for manufacturing an information display panel of the present invention. A method for forming a color filter in the method for manufacturing an information display panel of the present invention will be described with reference to FIGS. 5A to 5D. First, as shown in FIG. 5A, a transparent substrate 2 made of a film substrate is used. For example, an ITO film to be the transparent electrode 6 is formed on one surface and patterned as shown in FIG. 5B to form the transparent electrode 6. Next, as shown in FIG. 5 (c), the other surface of the transparent substrate 2 made of a film substrate is processed by a known method such as a photolithography method, an ink jet method, a gravure printing method, etc., and the color filter layer 12R, 12G and 12B are formed continuously. Finally, as shown in FIG. 5D, a protective film 13 having high weather resistance and killing resistance is laminated together with the sealing material 14 on the surface of the transparent color filters 12R, 12G, and 12B.

  According to the method for manufacturing an information display panel of the present invention described above, the color filter layer can be processed without damaging the patterned transparent electrode 6. Further, this technique can protect the color filter layers 12R, 12G, and 12B, and at the same time improve the functionality such as antireflection. In particular, when the protective filter 13 is not provided, the color filter layer is directly exposed on the outermost surface, so it is often necessary to take measures against weather resistance, and the processed color filter layer has irregularities on the surface. In some cases, the light may be revolted. In the present invention, by laminating the protective film 13 having high weather resistance and damage resistance together with the sealing material 14, durability is improved, and there is no optical surface irregularity, so that the quality is improved.

  In addition, the lamination of the color filter layer by the protective film 13 described above is performed by applying a 30 μm acrylic adhesive to a polyester base material to produce a sealing film, and thermally laminating the sealing film at 100 ° C. Or it can carry out by applying EVA750R made from Tosoh at 30 micrometers to a polyester base material, producing a sealing film, and heat-laminating this sealing film at 80 degreeC.

  Moreover, in this example, as shown in FIG.5 (b), after patterning with the transparent substrate 6, the pattern surface was protected with the protective film (not shown), and the color filter process was implemented. Although this structure can suppress damage to the transparent substrate 6 better, this structure is not essential. In addition, in the method for manufacturing an information display panel of the present invention described above, the formation of the transparent substrate 6, patterning, and formation of the color filter layer by the photolithography method, the ink jet method, the gravure printing method, and the like have been conventionally known. Can be used.

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

  Regarding the substrate, at least one of the observation side substrates is a transparent substrate 2 having a transparent flexibility that allows the color of the display medium to be confirmed from the outside of the information display panel, and a material having high visible light transmittance and good heat resistance is used. Is preferred. The substrate 1 may be transparent or opaque. Examples of the substrate material include polymer sheets such as polyethylene terephthalate, polyethylene naphthalate, polyethersulfone, polyethylene, polycarbonate, polyimide, and acrylic, and flexible materials such as metal sheets. The thickness of the substrate is preferably from 2 to 5000 μm, more preferably from 5 to 2000 μm. If it is too thin, it will be difficult to maintain the strength and the spacing uniformity between the substrates, and if it is thicker than 5000 μm, it will be a thin information display panel. Is inconvenient.

  Electrode forming materials for forming electrodes include metals such as aluminum, silver, nickel, copper and gold, indium tin oxide (ITO), indium oxide, conductive tin oxide, antimony tin oxide (ATO), conductive Conductive metal oxides such as conductive zinc oxide, and conductive polymers such as polyaniline, polypyrrole and polythiophene are exemplified and used as appropriate. As a method for forming an electrode, a method of forming the above-described materials into a thin film by sputtering, vacuum deposition, CVD (chemical vapor deposition), coating, or the like, or mixing a conductive agent with a solvent or a synthetic resin binder. The method of apply | coating is used. The electrode provided on the display surface side substrate 2 which is on the viewing side and needs to be transparent needs to be transparent, but the electrode provided on the back side substrate 1 does not need to be transparent. In any case, the above-mentioned material that can be patterned and is electrically conductive can be suitably used. Note that the electrode thickness is not particularly limited as long as the conductivity can be secured and the light transmittance is not hindered, and is preferably 3 to 1000 nm, preferably 5 to 400 nm. The material and thickness of the electrode provided on the back side substrate 1 are the same as those of the electrode provided on the display surface side substrate described above, but need not be transparent. In this case, the external voltage input may be superimposed with a direct current or an alternating current.

The shape of the partition 4 in the case where the partition is provided on the substrate is appropriately set appropriately depending on the type of display medium involved in display, the shape and arrangement of the electrodes to be arranged, and is not limited in general. The height of the partition is adjusted to 100 to 100 μm, preferably 3 to 50 μm, and the height of the partition wall to 10 to 100 μm, preferably 10 to 50 μm.
In forming the partition wall, a both-rib method in which ribs are formed on each of the opposing substrates 1 and 2 and then bonded, and a single-rib method in which ribs are formed only on one substrate are conceivable. In the present invention, any method is preferably used.
As shown in FIG. 6, the cells formed by the partition walls made up 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, the powder fluid used as a display medium in the information display panel of the present invention will be described. As for the name of the powder fluid used in the information display panel of the present invention, the present applicant has obtained the right of “Electronic Powder Fluid (registered trademark): Registration No. 4636931”.

  The “powder fluid” in the present invention is a substance in an intermediate state of both fluid and particle characteristics that exhibits fluidity by itself without borrowing the force of gas or liquid. For example, liquid crystal is defined as an intermediate phase between a liquid and a solid, and has fluidity that is a characteristic of liquid and anisotropy (optical properties) that is a characteristic of solid (Heibonsha: Encyclopedia) . On the other hand, the definition of particle is an object with a finite mass even if it is negligible, and is said to be affected by gravity (Maruzen: Physics Encyclopedia). Here, even in the case of particles, there are special states of gas-solid fluidized bed and liquid-solid fluids. When gas is flowed from the bottom plate to the particles, upward force is applied to the particles according to the velocity of the gas. Is a gas-solid fluidized bed that is in a state where it can easily flow when it balances with gravity, and it is also called a liquid-solid fluidized state that is fluidized by a fluid (ordinary) Company: Encyclopedia). As described above, the gas-solid fluidized bed body and the liquid-solid fluid are in a state of using a gas or liquid flow. In the present invention, it has been found that a substance in a state of fluidity can be produced specifically without borrowing the force of such gas and liquid, and this is defined as powder fluid.

  That is, the pulverulent fluid in the present invention is in an intermediate state having both the characteristics of particles and liquid, as in the definition of liquid crystal (liquid and solid intermediate phase), and is the characteristic of the above-mentioned particles. It is a substance that is extremely unaffected and exhibits a unique state with high fluidity. Such a substance can be obtained in an aerosol state, that is, in a dispersion system in which a solid or liquid substance is stably suspended as a dispersoid in a gas, and the solid substance is regarded as a dispersoid in the information display panel of the present invention. To do.

The information display panel of the present invention encloses a powder fluid exhibiting high fluidity in an aerosol state in which solid particles are stably suspended as a dispersoid, for example, in a gas between opposing substrates, at least one of which is transparent. Yes, such a pulverulent fluid exhibits a state that is so fluid that it does not form an angle of repose, which is an index indicating the fluidity of the powder. Coulomb force is generated by an electric field formed by applying a low voltage, etc. It can be easily and stably moved.
As described above, for example, the powder fluid used as a display medium in the present invention is a substance in an intermediate state between fluid and particles that exhibits fluidity by itself without borrowing the force of gas or liquid. It is. This powder fluid can be in an aerosol state in particular, and in the information display panel of the present invention, it is used as a display medium that can easily create a state in which a solid substance floats relatively stably as a dispersoid in a gas. .

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

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

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

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

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

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

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

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

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

Furthermore, in the present invention, regarding the particle size distribution of each particle, the particle size distribution Span represented by the following formula is less than 5, preferably less than 3.
Span = (d (0.9) −d (0.1)) / d (0.5)
(However, d (0.5) is a numerical value expressing the particle diameter in μm that 50% of the particles are larger than this and 50% is smaller than this, and d (0.1) is a particle in which the ratio of the smaller particles is 10%. (Numerical value expressed in μm, and d (0.9) is a numerical value expressed in μm for a particle diameter of 90% or less.)
By keeping Span within a range of 5 or less, the size of each particle is uniform, and movement as a uniform display medium becomes possible.

  Furthermore, regarding the correlation between the particles, the ratio of the d (0.5) of the particles having the minimum diameter to the d (0.5) of the particles having the maximum diameter among the used particles is set to 50 or less, preferably 10 or less. It is essential. Even if the particle size distribution Span is reduced, particles with different charging characteristics move in opposite directions, so that the particle size is close to each other and each particle can be easily moved in the opposite direction by the equivalent amount. This is within this range.

The particle size distribution and the particle size can be obtained from a laser diffraction / scattering method or the like. When laser light is irradiated onto particles to be measured, a light intensity distribution pattern of diffracted / scattered light is spatially generated, and this light intensity pattern has a corresponding relationship with the particle diameter, so that the particle diameter and particle diameter distribution can be measured. .
Here, the particle size and particle size distribution in the present invention are obtained from a volume-based distribution. Specifically, using a Mastersizer2000 (Malvern Instruments Ltd.) measuring instrument, put particles into a nitrogen stream and use the attached analysis software (software based on volume-based distribution using Mie theory). The diameter and particle size distribution can be measured.

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

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

Furthermore, when a display medium composed of colored particles for display is applied to a dry information display panel that is driven in the air space, it is important to manage the gas in the void surrounding the display medium between the substrates. Contributes to improved stability. Specifically, it is important that the relative humidity at 25 ° C. is 60% RH or less, and preferably 50% RH or less for the humidity of the gas in the gap.
1A, 1B, 2A, and 3A to 3D, electrodes 5 and 6 (electrodes are connected to the gap between the opposing substrate 1 and substrate 2 in FIGS. In the case of being provided inside the substrate), a gas portion in contact with a so-called display medium excluding an occupied portion of the display medium 3, an occupied portion of the partition 4, and a seal portion of the information display panel is meant.
The gas in the gap is not limited as long as it is in the humidity region described above, but dry air, dry nitrogen, dry argon, dry helium, dry carbon dioxide, dry methane, and the like are preferable. This gas needs to be sealed in an information display panel so that the humidity is maintained, for example, filling a display medium, assembling an information display panel in a predetermined humidity environment, It is important to apply a sealing material and a sealing method that prevent moisture from entering from the outside.

The distance between the substrates in the information display panel of the present invention is not limited as long as the display medium can be moved and the contrast can be maintained, but is usually adjusted to 10 to 500 μm, preferably 10 to 200 μm.
The volume occupation ratio of the display medium in the space between the opposing substrates is preferably 5 to 70%, more preferably 5 to 60%. If it exceeds 70%, the movement of the display medium is hindered, and if it is less than 5%, the contrast tends to be unclear.

  The information display panel of the present invention is a notebook computer, electronic notebook, PDA (Personal Digital Assistants), a portable information device, a display unit of a mobile device such as a mobile phone or a handy terminal, an electronic paper such as an electronic book or an electronic newspaper. , Billboards such as signboards, posters, blackboards (whiteboards), electronic desk calculators, display units for home appliances, automotive products, card display units such as point cards, IC cards, electronic advertisements, information boards, electronic POPs (Point Of) Presence, Point Of Purchase advertising), electronic price tag, electronic shelf label, electronic score, display unit of RF-ID device, as well as display unit of various electronic devices such as POS terminal, car navigation device, clock.

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

(A), (b) is a figure which shows the structure of an example of the information display panel of this invention, respectively. It is a figure which shows the structure of the other example of the information display panel of this invention. (A)-(d) is a figure which shows the structure of the further another example of the information display panel of this invention, respectively. It is a figure which shows the structure of a specific example of the information display panel of this invention. (A)-(d) is a figure for demonstrating an example of the color filter formation method in the manufacturing method of the information display panel of this invention, respectively. It is a figure which shows an example of the shape of the partition in the information display panel of this invention. (A)-(e) is a figure which shows an example of the manufacturing method of the conventional information display panel, respectively.

Explanation of symbols

1, 2 Substrate 3 Display medium (particle group, powder fluid)
3W White medium for display 3Wa White particles for display 3B Black display medium 3Ba Black particles for display 4 Bulkhead 5, 6 Electrode 7 Color plate 8 Capsule 9 Rotating ball type display medium 11 Cell 12R, 12G, 12B Color filter layer 13 Protective film 14 Sealing material

Claims (3)

  A display medium is sealed between two substrates, at least one of which is transparent, a voltage is applied between electrodes provided on each substrate, and an electric field is applied to the display medium, thereby moving the display medium and information such as an image. In the information display panel for displaying the transparent substrate on the observation side, a transparent substrate is formed on the inner surface of the transparent film substrate surface facing the rear substrate. An information display panel, wherein a color filter of each color is formed at a position corresponding to a transparent electrode on an outer surface, and a protective film is formed on the color filter.   The information display panel according to claim 1, wherein the film substrate is made of a resin.   3. The method for manufacturing an information display panel according to claim 1 or 2, wherein a transparent substrate, a color filter and a protective film are formed on a transparent substrate on the observation side by patterning the transparent substrate on one surface of the transparent substrate. Manufacturing an information display panel, comprising: a step of forming a color filter on the other surface of the transparent substrate after patterning the transparent substrate; and a step of laminating a protective film on the color filter. Method.

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