JP2008158509A - Method of driving panel for information display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of driving a panel for information display capable of obtaining a high-contrast and high-definition image which is demanded recently. <P>SOLUTION: In the method of driving the panel for information display for displaying information of an image etc., by moving a display medium by applying the display medium with an electric field produced by applying a plurality of pulse voltages a column-side line electrode provided to one substrate and a row-side line electrode provided to the other substrate and crossing the column-side line electrode at right angles while the display medium is charged between the two substrates at least one of which is transparent, when the difference between a voltage of each pulse applied of the column-side line electrode and a voltage applied to the row side is denoted as dV, a rise from 10 to 90% of a voltage value that the dV should reach is set to ≤100 μsec and the width of the pulse is set to 30 μsec to 1 msec. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention encloses a display medium in a space between two substrates, at least one of which is transparent, and is perpendicular to the column-side line electrode provided on one substrate and the column-side line electrode provided on the other substrate. For driving an information display panel for displaying information such as an image by moving the display medium by applying an electric field generated by applying a plurality of pulse voltages to the line electrode on the side to the display medium It is about.

Conventionally, a display medium is sealed in a space between two substrates, at least one of which is transparent, and the row side electrode orthogonal to the column side line electrode provided on one substrate and the column side line electrode provided on the other substrate is provided. An information display panel driving method for displaying information such as an image by moving the display medium by applying an electric field generated by applying a plurality of pulse voltages between the line electrodes to the display medium is known. (For example, refer to Patent Document 1).
JP 2006-58643 A

  Although the information display panel driving method described above has sufficiently achieved the contrast required for information display, which has been conventionally required, there has been a problem that it has not been possible to achieve the high contrast required for information display in recent years. In addition, the rewrite time tends to increase as the screen becomes higher in definition, and a technique for shortening the pulse time has been desired to prevent this.

  An object of the present invention is to solve the above-mentioned conventional problems and to provide an information display panel having a high contrast and a fine screen that have been required in recent years.

  The information display panel driving method of the present invention includes a display medium sealed in a space between two substrates, at least one of which is transparent, and a column side line electrode provided on one substrate and a column side provided on the other substrate. Display information such as images by moving the display medium by applying an electric field generated by applying multiple pulse voltages to the line electrode on the low side perpendicular to the line electrode. In the information display panel driving method, when the difference between the voltage applied to the column-side line electrode and the voltage applied to the low side of each pulse is dV, 10% of the voltage value to be reached by dV is 10%. The rise from the value to 90% is 100 μsec or less.

  As a preferred example of the method for driving the information display panel of the present invention, the pulse length to be applied is 30 μsec or more and 1 msec or less, and the number of pulses applied to one display unit is 5 or more and 50 or less, preferably May be 8 times or more and 30 times or less, and the interval between pulses applied a plurality of times may be 30 μsec or more and 1 msec or less.

  According to the present invention, when the difference between the voltage applied to the line electrode on the column side and the voltage applied to the low side of each pulse is dV, the value from 10% to 90% of the voltage value to be reached by dV. By setting the rise to the value of 100 μsec or less, it is possible to obtain an information display panel driving method capable of achieving the high contrast required in recent years.

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

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

  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. The electrode 5 (line electrode) provided on the substrate 1 in each cell formed by the partition walls 4 is provided with a white display medium 3W composed of a plurality of particle groups and a black display medium 3B composed of a particle group of black display medium particles 3Ba. ) And an electrode 6 (line electrode) provided on the substrate 2, and is moved perpendicularly to the substrates 1 and 2 according to an electric field generated by applying a voltage. Then, the white display medium 3W is visually recognized by the observer as shown in FIG. 1A, or white display is performed, or the black display medium 3B is visually recognized by the observer as shown in FIG. 1B. The display is black. In addition, in FIG. 1 (a), (b), the partition in front is abbreviate | omitted. The electrode may be provided outside the substrate, or may be provided so as to be embedded inside the substrate.

  In the example shown in FIGS. 2A and 2B, an example of color display in which a display unit is configured by three cells is shown. In the example shown in FIGS. 2A and 2B, as the display medium, all the cells 11-1 to 11-3 are filled with the white display medium 3W and the black display medium 3B, and the first cell 11-1 is filled. A red color filter 12R is provided on the viewer side, a green color filter 12G is provided on the viewer side of the second cell 11-2, a blue color filter 12BL is provided on the viewer side of the third cell 11-3, A display unit is composed of three cells, the first cell 11-1, the second cell 11-2, and the third cell 11-3. In this example, as shown in FIG. 2 (a), the white display medium 3W is moved in the first cell 11-1 to the third cell 11-3 to the viewer side. As shown in FIG. 2B, the white display is performed, and the black display medium 3B is moved in the first cell 11-1 to the third cell 11-3 to the observer side. In contrast, black display is performed. In addition, in FIG. 2 (a), (b), the partition in front is abbreviate | omitted. The electrode may be provided outside the substrate, or may be provided so as to be embedded inside the substrate.

  In the above description, the white display medium 3W including the particle group is replaced with a white display medium including the powder fluid or the powder, and the black display medium 3B including the particle group is replaced with the black display medium including the powder fluid or powder. The same applies to the case. The powder fluid will be described later.

  Hereinafter, a method for driving the information display panel, which is a feature of the present invention, will be described.

  FIG. 3 is a diagram for explaining one configuration of the electrode of the panel which is a target of the driving method of the present invention. In the example shown in FIG. 3, in the driving method of the present invention, the column-side line electrode 5 provided on one substrate (here, the substrate 1 on the back side) and the other substrate (here, the substrate 2 on the display surface side). A plurality of pulse voltages are applied between the row-side line electrode 6 orthogonal to the column-side line electrode 5 provided on the display side, and passive matrix driving is performed to display information such as an image on the information display panel. Is displayed.

  FIG. 4 is a diagram for explaining an example of a pulse voltage used in the driving method of the present invention. The feature of the present invention is that, in the example shown in FIG. 4, when the difference between the voltage applied to the column-side line electrode 5 and the voltage applied to the row-side line electrode 6 is dV, The time t1 required for the rise from the start of application (dV = 0.1 dV) to the voltage value of 90% (0.9 dV) with respect to the voltage value to be reached by dV is set to 100 μsec or less. In this way, the contrast required during information display can be significantly improved by making the time required for the rise of the pulse voltage much faster than in the past.

  This is because in the information display panel of this configuration, the particles are not necessarily distributed uniformly, and there are particles having a low potential for movement. Such particles first move to the facing electrode, but if a sufficient electric field is formed in a time corresponding to that particle, the image force and adhesion force of the facing electrode will cancel, and in that state It was found that the avalanche phenomenon occurs when the accelerated particles collide and the movement of the particles is further promoted. The present inventor has found that when a pulse having the above voltage and rise time is used in a panel having this configuration, the reduction occurs, and thereby sufficient contrast can be obtained with less power consumption and a short rewriting time. Has been reached.

  Next, a preferred example of the driving method of the present invention will be described. First, in the driving method of the present invention, in the example shown in FIG. 4, it is preferable that each pulse length t2 to be applied is 30 μsec or more and 1 msec or less. The reason is that if the pulse length t2 is less than 30 μsec, the particles cannot move from one electrode to the other electrode, and if the pulse length t2 exceeds 1 msec, the effect is not particularly changed, but power consumption is wasted. . In the driving method of the present invention, in the example shown in FIG. 4, the number of pulses n applied to one display unit is preferably 5 or more and 50 or less, more preferably 8 or more and 30 or less. . The reason for this is that if the number of pulses is less than 5 times, the movement of all particles from the electrode to the other electrode may not be completed. If the number of pulses exceeds 50 times, the movement of all particles is definitely completed. This is because the power consumption is wasted. Furthermore, in the driving method according to the present invention, in the example shown in FIG. The reason why it is preferable is that when t3 exceeds 1 msec, the effect is not particularly changed, but power consumption is wasted.

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

  As for the substrate, at least one substrate is the transparent substrate 2 from which the color of the display medium can be confirmed from the outside of the information display panel, and a material having high visible light transmittance and good heat resistance is preferable. The substrate 1 may be transparent or opaque. Examples of substrate materials include polymer sheets such as polyethylene terephthalate, polyethylene naphthalate, polyethersulfone, polyethylene, polycarbonate, polyimide, and acrylic, flexible materials such as metal sheets, and glass and quartz. An inorganic sheet having no flexibility is mentioned. The thickness of the substrate is preferably from 2 to 5000 μm, more preferably from 5 to 2000 μm. If it is too thin, it will be difficult to maintain the strength and the spacing uniformity between the substrates, and if it is thicker than 5000 μm, it will be a thin information display panel. Is inconvenient.

  Electrode forming materials include metals such as aluminum, silver, nickel, copper, gold, and conductive materials such as indium tin oxide (ITO), indium oxide, antimony tin oxide (ATO), conductive tin oxide, 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 which is on the viewing side and needs to be transparent needs to be transparent, but the electrode provided on the back side substrate 1 does not need to be transparent. In any case, the above-mentioned material that can be patterned and is electrically conductive can be suitably used. Note that the electrode thickness is not particularly limited as long as the conductivity can be secured and the light transmittance is not hindered, and is preferably 3 to 1000 nm, preferably 5 to 400 nm. The material and thickness of the electrode provided on the back side substrate 1 are the same as those of the electrode provided on the display surface side substrate described above, but need not be transparent. In this case, the external voltage input may be superimposed with direct current or alternating current.

The shape of the partition 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. 5, the cells formed by the partition walls made of these ribs are exemplified by a square shape, a triangular shape, a line shape, a circular shape, and a hexagonal shape as viewed from the plane of the substrate. And a mesh shape. It is better to make the portion corresponding to the cross section of the partition wall visible from the display surface side (the area of the cell frame) as small as possible, and the display 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, for example, a powder fluid used as a display medium used for an information display panel which is a target of the driving method of the present invention will be described. As for the name of the powder fluid used in the information display panel that is the subject 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 to which the present invention is applied encloses a powder fluid that exhibits high fluidity in an aerosol state in which at least one is transparent, between opposed substrates, for example, solid particles in gas are stably suspended as a dispersoid Such pulverulent fluid is so fluid that it cannot measure the angle of repose, which is an index indicating the fluidity of the powder, and it can be easily and stably moved by Coulomb force with a small electric field force. Can be made.
As described above, for example, the powder fluid used as the display medium in the present invention is a substance in the intermediate state between the fluid and particles that exhibits fluidity by itself without borrowing the force of gas or liquid. It is. This powder fluid can be in an aerosol state in particular, and in the information display panel of the present invention, it is used as a display medium in a state where a solid substance floats relatively stably as a dispersoid in the gas.

Next, display medium particles (hereinafter, also referred to as particles) constituting the display medium in the information display panel that is the target of the driving method of the present invention will be described. The display medium particles are composed of the display medium particles as they are to form a display medium, or are combined with other particles to form a display medium, or adjusted and configured to become a powder fluid to form a display medium. Or used.
The particles can contain a charge control agent, a colorant, an inorganic additive, and the like, 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, 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.
By blending the colorant, particles for a display medium having a desired color can be produced.

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

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

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

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

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

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

Furthermore, when applied to an information display panel in which a display medium such as a particle group composed of display medium particles or a powdered fluid is driven in a gas space, the gas in the void surrounding the display medium between the substrates can be managed. It is important and contributes to improved display 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.
For example, in FIG. 1 (a) and FIG. 1 (b), the gap portion refers to electrodes 5 and 6 (when electrodes are provided inside the substrate) from the portion sandwiched between the opposing substrate 1 and substrate 2, and display medium 3 Occupying portion, partition wall 4 occupying portion (when a partition wall is provided), and a sealing portion of the information display panel, excluding a sealing portion, a gas portion in contact with a so-called display medium.
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 (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 gas space between the opposing substrates is preferably 5 to 70%, more preferably 5 to 60%. If it exceeds 70%, the movement of the display medium is hindered, and if it is less than 5%, the contrast tends to be unclear.

  Under the driving conditions in which a pulse voltage with a driving voltage of 70 V, an ON time of 200 ms, and an OFF time of 200 ms is applied five times to the prepared information display panel, a rise time of 90% with respect to the voltage value to be reached is 1 μs, 50 μs. , 100 μs, 500 μs, 1000 μs, 5000 μs, 10000 μs, 50000 μs, 100000 μs, 500000 μs, and 1000000 μs, and the contrast ratio was obtained. The results are shown in FIG. From the results of FIG. 6, it was found that a high contrast ratio can be obtained when the rise time up to 90% with respect to the voltage value to be reached is 100 μs or less.

  Further, as described above, in the actual description, a larger number of pulse voltages are input, but even in that case, it was found that a high contrast ratio can be obtained by inputting a pulse voltage having a short rise time as described above. In this example, the contrast ratio means that black display and white display are alternately displayed, and means the ratio between the reflectance during white display and the reflectance during black display, and this contrast ratio is high. A higher contrast can be obtained.

  General information display panels subject to the present invention include notebook computers, electronic notebooks, portable information devices called PDA (Personal Digital Assistants), display units of mobile devices such as mobile phones and handy terminals, electronic books, Electronic paper such as electronic newspapers, electronic manuals (instruction manuals), signboards, posters, bulletin boards such as blackboards (whiteboards), electronic desk calculators, home appliances, display parts for automobiles, point cards, cards such as IC cards Display unit, electronic advertisement, information board, electronic POP (Point Of Presence, Point Of Purchase advertising), electronic price tag, electronic shelf label, electronic score, display unit of RF-ID equipment, POS terminal, car navigation device, watch It is used suitably for the display part of various electronic devices. In addition, it can be suitably used as an external electric field forming means for rewritable paper (which can be rewritten using an external electric field forming means).

(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. It is a figure for demonstrating one structure of the electrode of the panel used as the object of the drive method of this invention. It is a figure for demonstrating an example of the pulse voltage used for the drive method of this invention. It is a figure which shows an example of the shape of the partition in the information display panel used as the object of this invention. It is a graph which shows the relationship between the rise time in an Example, and contrast ratio.

Explanation of symbols

1, 2 Substrate 3 Display medium (particle group, powder fluid)
3W White display medium 3Wa White display medium particles 3B Black display medium 3Ba Black display medium particles 4 Bulkhead 5, 6 Electrode 7 Black plate 8 Insulating liquid 9 Microcapsule 10 Rotating ball 11-1 First cell 11-2 2nd Cell 11-3 third cell 12R red color filter 12G green color filter 12BL blue color filter

Claims (4)

  A display medium is sealed in a space between two substrates, at least one of which is transparent, and a row-side line electrode orthogonal to a column-side line electrode provided on one substrate and a column-side line electrode provided on the other substrate In an information display panel driving method for displaying information such as an image by moving the display medium by applying an electric field generated by applying a plurality of pulse voltages between the display medium and each pulse, When the difference between the voltage applied to the column side line electrode and the voltage applied to the row side is dV, the rise from 10% to 90% of the voltage value to be reached by dV is 100 μsec or less. A method for driving an information display panel, characterized in that:   2. The method for driving an information display panel according to claim 1, wherein each pulse length to be applied is 30 μsec or more and 1 msec or less.   3. The method for driving an information display panel according to claim 1, wherein the number of pulses applied to one display unit is 5 to 50 times, preferably 8 to 30 times.   The method for driving an information display panel according to any one of claims 1 to 3, wherein an interval between pulses applied a plurality of times is set to 1 msec or less.

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