JP2008033019A - Storage system for panel for information display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a storage system for a panel for information display that can store the panel for information display in an excellent state even when the panel for information display is stored in an unused state for a long period. <P>SOLUTION: Disclosed is the storage system for the panel for information display which displays image by charging a display medium comprising at least one or more kinds of colored particles for display comprising at least one or more kinds of particles between two opposed substrates at least one of which is transparent and moving the display medium with an electric field produced within the substrates, the storage system performing driving operation for the display medium by: (1) inputting a driving signal from an external driving signal periodic input device 21 and placing a driving power source 23 mounted on the panel for information display in operation at fixed intervals; or (2) connecting an external power source to a connection terminal of the panel for information display and supplying driving power to the panel for information display at fixed intervals to place the panel for information display in operation. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention encloses a display medium composed of at least one or more kinds of colored particles for display composed of at least one kind of particles between two opposing substrates, at least one of which is transparent, The present invention relates to a storage system for an information display panel that displays information by moving a display medium by an electric field generated, and particularly relates to a storage system that is used when an information display panel is stored unused for a long period of time.

Conventionally, a display medium composed of at least one or more kinds of colored particles for display composed of at least one kind of particles is sealed between two opposing substrates, at least one of which is transparent, and is generated in the substrate. In an information display panel that displays information by moving the display medium by the applied electric field, if the same information is displayed for a long time, the charging characteristics of the display medium change, which adversely affects the drive characteristics of the information display panel. It was known to give. In order to solve this problem, when the same information is continuously displayed for a long time (predetermined time or longer), the operation of returning to the original display information after inverting or uniforming the electric field distribution of the electric field driven display medium An information display system that performs at least once has been known (for example, see Patent Document 1).
International Publication WO2006 / 015959 Pamphlet

  In the information display system described in Patent Document 1 described above, an information display panel that incorporates an information display panel and is used as an information display device (information display system) and does not incorporate a power source is provided. There was a problem that it could not be used as a storage system for stock storage. Also, even when stored as stock, solid background images will continue to be displayed for a long time, but since the power is not supplied during stock storage, the information display system will operate even after a predetermined time. There was also a problem that could not be done. Furthermore, if power is supplied from the battery when stocking information display panels equipped with battery power, the information display system can be operated, but there is a problem that the battery life may be reached during stock storage. There was also a problem that could not be used as a storage system.

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described problems and to store an information display panel in a good state even when the information display panel is stored unused for a long period of time. Is to provide.

  According to a first aspect of the information display panel storage system of the present invention, there is at least one kind of colored particles for display composed of at least one kind of particles between two opposing substrates, at least one of which is transparent. A storage system for an information display panel that encloses a configured display medium and displays the information by moving the display medium by an electric field generated in the substrate. The drive signal is input from an external drive signal periodic input device. Thus, the drive power source mounted on the information display panel is operated at regular intervals to drive the display medium.

  As a preferred example of the information display panel storage system according to the first aspect of the present invention, a drive signal periodic input device is connected to the connection terminal of the information display panel, and a timer for managing a fixed interval. Are provided in the information display panel or the drive signal regular input device.

  Further, the second invention of the information display panel storage system of the present invention is characterized in that at least one kind of display color composed of at least one kind of particles between two opposing substrates at least one of which is transparent. A storage system for an information display panel that encloses a display medium composed of particles and displays the information by moving the display medium by an electric field generated in the substrate. The display medium is driven by supplying power to the information display panel at regular intervals and operating the information display panel to operate the display medium.

  As a preferred example of the information display panel storage system according to the second aspect of the present invention, a timer for managing a fixed interval may be provided in the information display panel or an external power source.

  Furthermore, as a preferred example of the information display panel storage system common to the first and second inventions of the present invention, the number of times that the display medium is driven by a timer is managed, and the integration of driving the display medium is performed. Depending on the number of times, the value of the constant interval may be increased or decreased, and the display medium driving operation performed at regular intervals may drive all the display media existing on the display screen.

  According to the present invention, a display medium composed of at least one kind of colored particles for display composed of at least one kind of particles is sealed between two opposing substrates at least one of which is transparent, A storage system for an information display panel that displays information by moving a display medium by an electric field generated therein, and (1) an information display panel by inputting a drive signal from an external drive signal periodic input device The drive power source installed in the system is operated at regular intervals to drive the display medium, or (2) the information display panel is connected to an external power source for information display. By supplying drive power to the panel at regular intervals and operating it to drive the display medium, the information display panel remains in good condition even when stored unused for a long period of time. Affection It is possible to obtain storage system of the information display panel capable of storing the display panel.

  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 the 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 which is a target of the storage system 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. 1 (a) and 1 (b), at least two or more kinds of display media 3 (here, display white particles 3Wa) having different optical reflectance and charging characteristics composed of at least one kind of particles are used. A white display medium 3W made of a particle group and a black display medium 3B made of a particle group of display black particles 3Ba), and a line electrode 5 provided inside the substrate 1 and a line electrode 6 provided inside 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 so that the black display medium 3B is visually recognized by the observer to display black or the white display medium 3W. Is displayed in white by the observer. 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. Furthermore, the electrode can be provided outside the substrate, or can be provided so as to be embedded inside the substrate.

  In the example shown in FIGS. 2A and 2B, at least two or more kinds of display medium 3 (here, display white particles 3Wa) having different optical reflectance and charging characteristics composed of at least one kind of particles are used. A white display medium 3W made of a particle group and a black display medium 3B made of a particle group of display black particles 3Ba), and an individual electrode 5 provided on the inner side of the substrate 1 and an individual electrode 6 provided on the inner side of 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 so that the black display medium 3B is visually recognized by the observer to display black or the white display medium 3W. Is displayed in white by the observer. In the example shown in FIG. 2B, a cell is formed by providing partition walls 4 between the substrates 1 and 2, for example, in a lattice shape. Further, in FIG. 2 (b), the front partition is omitted. Furthermore, the electrode can be provided outside the substrate, or can be provided so as to be embedded inside the substrate.

  In the example shown in FIGS. 3A and 3B, the display medium 3 (here, a group of particles of white particles for display 3Wa) having at least an optical reflectance and a charging property composed of at least one kind of particles. The white display medium 3W) is moved in a direction parallel to the substrates 1 and 2 in accordance with the electric field generated by applying a voltage between the electrode 5 and the electrode 6 provided on the substrate 1, and the white display medium is displayed. 3W is visually recognized by the observer and white display is performed, or the color of the electrode 6 or the substrate 1 is visually recognized by the observer and the color of the electrode 6 or the substrate 1 is displayed. In the example shown in FIG. 3B, for example, a lattice-shaped 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. Furthermore, the electrode can be provided outside the substrate, or can be provided so as to be embedded inside the substrate.

  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.

  Next, a specific example of an information display panel that is a target of the storage system of the present invention based on the driving method described above will be described. 4 to 9 are diagrams showing specific examples of information display panels that are targets of the storage system of the present invention. In the examples shown in FIGS. 4 to 9, the same members as those in the examples shown in FIGS. 1A and 1B to FIGS. 3A and 3B are denoted by the same reference numerals, and the description thereof is omitted. .

  The example shown in FIG. 4 is an information display panel for two-color display using a white display medium 3W and a black display medium 3B, and displays an example in which the electrodes 5 and 6 are composed of line electrodes. The example shown in FIG. 5 is an information display panel for two-color display using a yellow display medium 3Y and a black display medium 3B, and displays an example in which the electrodes 5 and 6 are composed of individual electrodes.

  The example shown in FIG. 6 includes an area including a two-color display area using a white display medium 3W and a black display medium 3B and a two-color display area using a white display medium 3W and a red display medium 3R. In the information display panel for color display, an example in which the electrodes 5 and 6 are composed of line electrodes is displayed. The example shown in FIG. 7 is an area color display including a two-color display area using a yellow display medium 3Y and a black display medium 3B, and a two-color display area using a white display medium 3W and a red display medium 3R. In the information display panel, an example in which the electrodes 5 and 6 are composed of individual electrodes is displayed.

  Further, the example shown in FIG. 8 is an information display panel for two-color display using a white display medium 3W and a black display medium 3B. The electrodes 5 and 6 are composed of line electrodes, and three consecutive three An example in which R, G, and B color filters 11R, 11G, and 11BL are provided on the substrate 2 on the display surface side for each of the cells 11-1, 11-2, and 11-3 is displayed. The example shown in FIG. 9 is an information display panel for two-color display using a white display medium 3W and a black display medium 3B. The electrodes 5 and 6 are composed of individual electrodes, and three continuous cells 11 are provided. -1, 11-2, and 11-3 display an example in which R (red), G (green), and B (blue) color filters 11R, 11G, and 11BL are provided on the substrate 2 on the display surface side. Yes.

  Next, a specific example of the storage system of the present invention for storing the above-described information display panel will be described.

  FIGS. 10-12 is a figure for demonstrating an example of the storage system of the information display panel which concerns on 1st invention of this invention, respectively. In the example shown in FIGS. 10 to 12, a drive signal is input from an external drive signal regular input device 21, and the drive power source 23 mounted on the information display panel 22 is operated at regular intervals to drive the display medium. It is configured to operate. According to the storage system of the present invention described above, even when the storage system is stored unused for a long time, the display operation is performed at regular intervals, the charging characteristics of the display medium do not change, and the storage is performed for a long time. In particular, the drive characteristics of the information display panel can be kept good.

  The example shown in FIG. 10 shows an example in which five information display panels 22 each having a drive power source 23 are stored. As a preferred mode, the connection terminals 24 of the five information display panels 22 and the drive signal periodicity are shown. The input device 21 is connected to each other, and a timer 25 is provided in the drive signal periodic input device 21 as many as the number of information display panels 22, and the interval for performing the display operation during storage is controlled. In the example shown in FIG. 11, the timer 25 in the example shown in FIG. 10 is provided not on the drive signal regular input device 21 but on each information display panel 22. In the example shown in FIG. 12, an information display panel 22 (here, an electronic shelf label equipped with a battery is assumed as the drive power supply 23) is provided with a receiver for transmission / reception media such as radio waves, light or sound, and a drive signal periodic input device. The information display panel 22 is driven by a drive trigger of radio waves, light, or sound generated from a transmitter of a transmission / reception medium such as radio waves, light, or sound provided in 21. In the example shown in FIG. 12, as a preferred mode, twelve information display panels 22 are stored in a storage case 26 so that transmission / reception media such as radio waves, light, and sound do not leak outside the storage case 26. However, this configuration is not essential. Although not shown, it is preferable to provide the drive signal regular input device 21 with an antenna, a light emitting element, a speaker, and the like as members constituting the transmitter.

  FIGS. 13 and 14 are diagrams for explaining an example of the information display panel storage system according to the second invention of the present invention. In the example shown in FIG. 13 and FIG. 14, an external drive power supply 27 is connected to the connection terminal 24 of the information display panel 22, and the drive power is supplied to the information display panel 22 at regular intervals. The display medium is driven. Even in this example, as in the case described above, even when the storage is unused for a long time, the display operation is performed at regular intervals, and the charging characteristics of the display medium do not change, and the storage is performed for a long time. In particular, the drive characteristics of the information display panel can be kept good.

  In the example shown in FIG. 13, an example in which five information display panels 22 are stored is shown. As a preferable aspect, the connection terminals 24 provided on the five information display panels 22 and the external drive power supply 27 are connected to each other. In addition to being connected separately, timers 25 are provided in the external drive power supply 27 as many as the number of the information display panels 22, and the interval for performing the display operation during storage is controlled. In the example shown in FIG. 14, the timer 25 in the example shown in FIG. 13 is provided not on the external drive power supply 27 but on each information display panel 22. 13 and 14, the information display panel without the drive power supply is described. However, the information display panel with the drive power supply is connected to the external drive power supply separately from the drive power supply. It is also possible to provide a circuit and switch the connection to the driving circuit.

  15 to 17 are diagrams for explaining an example of the operation in the information display panel storage system of the present invention. In the example illustrated in FIGS. 15 to 17, an example will be described in which all display media existing on the entire screen are periodically driven as a preferred mode after a certain period. In the example shown in FIG. 15, the display at the time of storage is an example of a full screen white display (white solid), and the display after the first periodic operation becomes a full screen black display (black solid), and is displayed after the second regular operation. In, the full screen white display (white solid) is displayed, and in the display after the third periodic operation, the full screen white display (white solid) is obtained, and this is repeated thereafter. In the example shown in FIG. 16, the display at the time of storage is an example of a full screen black display (black solid), and the display after the first periodic operation becomes a full screen white display (white solid). In, the full-screen black display (black solid) is displayed, and in the display after the third periodic operation, the full-screen white display (white solid) is displayed, and this is repeated thereafter. In the example shown in FIG. 17, the display at the time of storage is an example in which a predetermined screen of black stars is displayed on a white background. In the display after the first periodic operation, a display in which the predetermined screen of white stars is inverted on a black background is displayed. In the display after the second periodic operation, the black screen with the black screen is reversed on the white background, and after the third periodic operation, the display with the white star is reversed on the black background. Repeat this. The image is not limited to the above, and various test pattern images can be used.

  FIG. 18 is a diagram for explaining an example of control at regular intervals in the information display panel storage system of the present invention. In the example shown in FIG. 18, the timer 25 as a preferable mode is used, and a constant interval control in the drive operation of the display medium can be performed at an interval at which the timer 25 reset at the previous display operation is timed up. In the case of only the control at regular intervals by the timer 25, the display medium is always driven at the same regular intervals even if the number of times of driving the display medium is increased. In this respect, as a more preferable aspect, another timer is provided in addition to the timer 25, the number of times that the display medium is driven by this timer is managed, The value at a constant interval can be increased or decreased. For example, as the number of integrated operations increases, by shortening the fixed interval, for example, even if the charging characteristics of the display medium deteriorate as the storage time becomes longer, it is possible to cope with changes in the charging characteristics of the display medium. Can do.

  Hereinafter, each member which comprises the information display panel used as the object of the storage system of this invention is demonstrated.

  As for the substrate, at least one of the observation side substrates is the transparent substrate 2 from which the color of the display medium can be confirmed from the outside of the information display panel, and a material having high visible light transmittance and good heat resistance is preferable. The substrate 1 may be transparent or opaque. Examples of substrate materials include polymer sheets such as polyethylene terephthalate, polyethylene naphthalate, polyethersulfone, polyethylene, polycarbonate, polyimide, and acrylic, flexible materials such as metal sheets, glass sheets, and quartz sheets. Such a thing without 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 include metals such as aluminum, silver, nickel, copper, and gold, and conductive materials such as indium tin oxide (ITO), indium oxide, conductive tin oxide, antimony tin oxide (ATO), and conductive zinc oxide. Conductive polymers such as metal oxides, polyaniline, polypyrrole, and polythiophene are exemplified and 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 display surface side substrate 2 that is on the observation 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 may not be light transmissive. 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. 19, 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 substrate plane direction. And a mesh shape. It is better to make the portion corresponding to the cross section of the partition wall visible from the display surface side (the area of the cell frame) as small as possible, and the display state 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 the display medium in the present invention is a substance in the intermediate state between the fluid and particles that exhibits fluidity by itself without borrowing the force of gas or liquid. It is. This powder fluid can be in an aerosol state in particular, and in the information display panel of the present invention, it is used as a display medium that can easily create a state in which a solid substance floats relatively stably as a dispersoid in a gas. .

Next, display colored particles (hereinafter also referred to as particles) constituting the display medium in the information display panel which is the subject of the present invention will be described. The colored particles for display are used as they are as a display medium by being composed of the colored particles for display as they are, or are combined with other particles to be used as a display medium, or adjusted so as to become a powder fluid.
The particles can contain a charge control agent, a colorant, an inorganic additive, and the like, 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 (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, resol 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 d (0.5) of the particles having the minimum diameter to d (0.5) of the particles having the maximum diameter among the used particles is set to 50 or less, preferably 10 or less. It is essential. Even if the particle size distribution Span is reduced, particles with different charging characteristics move in opposite directions, so that the particle size is close to each other and each particle can be easily moved in the opposite direction by the equivalent amount. This is within this range.

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

  The 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, 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, 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.

  The storage system of the present invention includes a notebook computer, an electronic notebook, a portable information device called PDA (Personal Digital Assistants), a display unit of a mobile device such as a mobile phone and a handy terminal, an electronic book such as an electronic book and an electronic newspaper, and a signboard. , Posters, bulletin boards such as blackboards, electronic desk calculators, home appliances, car supplies, card displays such as point cards, IC cards, electronic advertisements, information boards, electronic POPs (Point Of Presence, Point of purchase advertising), electronic price tags, electronic shelf labels, electronic musical scores, RF-ID device display units, as well as information display panels mounted on various electronic device display units such as POS terminals, car navigation devices, watches, etc. As a storage system, it is preferably used especially when storing as stock or when storing for a long time during transportation.

  As for the drive system of the information display panel to which the storage system of the present invention is applied, a simple matrix drive display panel or static drive display panel that does not use a switching element in the panel itself, or a thin film transistor (TFT). The present invention can be applied to various types of drive-type information display panels such as an active matrix drive type display panel using a three-terminal switching element represented by a representative or a two-terminal switching element represented by a thin film diode (TFD).

(A), (b) is a figure which shows the structure of an example of the information display panel used as the object of the storage system of this invention, respectively. (A)-(c) is a figure for demonstrating an example of the information display panel used as the object of the storage system of this invention, respectively. (A)-(c) is a figure for demonstrating the other example of the information display panel used as the object of the storage system of this invention, respectively. It is a figure which shows a specific example of the information display panel used as the object of the storage system of this invention. It is a figure which shows the other specific example of the information display panel used as the object of the storage system of this invention. It is a figure which shows other specific example of the information display panel used as the object of the storage system of this invention. It is a figure which shows other specific example of the information display panel used as the object of the storage system of this invention. It is a figure which shows other specific example of the information display panel used as the object of the storage system of this invention. It is a figure which shows other specific example of the information display panel used as the object of the storage system of this invention. It is a figure for demonstrating an example of the storage system of the information display panel which concerns on 1st invention of this invention. It is a figure for demonstrating the other example of the storage system of the information display panel which concerns on 1st invention of this invention. It is a figure for demonstrating the further another example of the storage system of the information display panel which concerns on 1st invention of this invention. It is a figure for demonstrating an example of the storage system of the information display panel which concerns on 2nd invention of this invention. It is a figure for demonstrating the other example of the storage system of the information display panel which concerns on 2nd invention of this invention. It is a figure for demonstrating an example of the operation | movement in the storage system of the information display panel of this invention. It is a figure for demonstrating the other example of operation | movement in the storage system of the information display panel of this invention. It is a figure for demonstrating the further another example of operation | movement in the storage system of the information display panel of this invention. It is a figure for demonstrating an example of control of the fixed space | interval in the storage system 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 of this invention.

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 3Y Yellow display medium 3R Red display medium 4 Bulkhead 5, 6 Electrode 11-1, 11-2, 11-3 Cell 12R, 12G, 12BL Color filter 21 Drive signal regular input device 22 Information display panel 23 Drive power supply 24 Connection terminal 25 Timer 26 Storage case 27 External drive power supply

Claims (7)

  An electric field generated in a substrate by enclosing a display medium composed of at least one kind of display colored particles composed of at least one kind of particles between two opposing substrates at least one of which is transparent Is a storage system for an information display panel that displays information by moving a display medium by using a drive signal input from an external drive signal periodic input device and switching a drive power source mounted on the information display panel at regular intervals. A storage system for an information display panel, wherein the display medium is driven to operate the display medium.   2. The information display panel storage system according to claim 1, wherein the drive signal periodic input device is connected to a connection terminal of the information display panel.   3. The information display panel storage system according to claim 1, wherein a timer for managing the predetermined interval is provided in the information display panel or the drive signal regular input device.   An electric field generated in a substrate by enclosing a display medium composed of at least one kind of display colored particles composed of at least one kind of particles between two opposing substrates at least one of which is transparent The storage system of the information display panel that displays information by moving the display medium by connecting an external power source to the connection terminal of the information display panel and supplying the drive power source to the information display panel at regular intervals. A storage system for an information display panel, wherein the storage medium is supplied and operated to drive a display medium.   5. The information display panel storage system according to claim 4, wherein a timer for managing the fixed interval is provided in the information display panel or the external power source.   The number of times that the display medium is driven and operated by a timer is managed, and the value of the predetermined interval is increased or decreased according to the number of times that the display medium is driven and operated. Storage system for the information display panel described. The storage system for an information display panel according to any one of claims 1 to 6, wherein in the display medium driving operation performed at regular intervals, all display media existing on a display screen are driven. .

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