KR20070018550A - Particle For Image Display In Electronic Paper Having Dehumidifying Material, Display Apparatus Using The Same And Manufacturing Process Thereof - Google Patents

Abstract

The present invention relates to an image display particle of a dry electronic paper containing a dehumidifying material, a display device using the same, and a method of manufacturing the same. Pellet, case used in a dehumidifying material or a wet electronic paper by conventional physical dehumidification adsorption The dehumidifying agent of the type and film form has a problem that it is difficult to apply in dry electronic paper due to changes in charging characteristics and spatial limitations, and according to the present invention, at least one of the dehumidifying agents is enclosed between at least one transparent substrate. An image display particle of dry electronic paper which is moved by an electric field applied between substrates to display an image, wherein the at least one particle includes a dehumidifying substance for removing moisture. In the case of the image display particles of paper, the dry electronic paper of humidity sensitive toner There is an effect that can effectively remove moisture without disturbing the movement and charging characteristics of the particles.

Electronic paper, dehumidifier, particle for image display

Description

Particles for image display of dry electronic paper containing dehumidifying substance, display device using same and manufacturing method therefor {Particle For Image Display In Electronic Paper Having Dehumidifying Material, Display Apparatus Using The Same And Manufacturing Process Thereof}

1A to 1C are sequence cross-sectional views each showing an example of an image display element used in a dry electronic paper display device according to the prior art and its display drive winry;

2 is a cross-sectional view illustrating a case type electronic paper display device in which a dehumidifying material is included in a breathable container according to the prior art;

3 is a perspective view illustrating an electronic paper display device including a dehumidifying material in the form of a film according to the prior art;

4 is a schematic diagram showing the image display particles included in the dehumidifying agent used in the image display apparatus of the dry electronic paper according to an embodiment of the present invention,

FIG. 5 is a cross-sectional view showing an example of an image display apparatus in which image display particles of dry electronic paper are used according to one embodiment of the present invention. FIG.

** Description of Symbols for Main Parts of Drawings **

1: dehumidifying agent 2: external additive

3: mother particle 4: upper substrate

5: counter substrate 6: charged particles

7: bulkhead

The present invention relates to an image display particle used in dry electronic paper and a device using the same. More particularly, at least one particle is enclosed between transparent substrates and an electric field is applied between the substrates. A dry electronic paper display particle used in a dry electronic paper display device which displays an image by moving the particles by a coulomb force, wherein the at least one particle includes a dehumidifying substance for removing moisture. It is a particle for image display of paper.

Conventionally, an image display device using an electrophoretic method, an electrochromic method, a thermal method, a two-color particle rotation method and the like has been proposed as an image display device replacing a liquid crystal (LCD). This type of technology can be used in the next generation of inexpensive image display devices because it has advantages such as obtaining a wider viewing angle closer to a normal printed matter, smaller power consumption, and a memory function than LCDs. It is considered to be developed into image display for mobile terminals, electronic paper and the like.

In recent years, the electrophoresis method which microencapsulates the dispersion liquid which consists of a dispersion particle and a coloring solution, and arrange | positions it between the opposing board | substrates is proposed and the expectation is gathering. However, in the electrophoresis method, since particles move in the dispersion, there is a problem that the response speed is slow due to the viscosity resistance of the liquid. In addition, since the high specific gravity particles such as titanium oxide are dispersed in the low specific gravity solution, they tend to settle, are difficult to maintain the stability of the dispersed state, and suffer from the lack of image repeat stability. Even if microencapsulation results in a cell size of microcapsules, the above-mentioned defects are not easily apparent in appearance, but the essential problem is not solved at all.

In the electrophoretic method using the behavior in such a solution, two or more kinds of particles having different colors and charging characteristics are enclosed between at least one transparent substrate without using a solution in recent years, and either one of the substrates or There has been proposed an image display apparatus which imparts an electric field to the particles from an electrode pair composed of electrodes formed on both sides, and moves the particles by coulomb force to display an image. The operation mechanism of such a dry display device is to sandwich a mixture of two kinds of particles having different colors and charge polarities between the electrode discs and to apply a voltage to the electrode discs, thereby generating an electric field between the pole discs to generate a polarity. It is used as a display element by making different charged particles fly in a different direction. These are dry display devices that consist of particles and substrates and utilize particle behavior in gas, and solve problems such as sedimentation and flocculation of particles, which have been a problem in electrophoresis because no solution is used. This has the advantage of being small and fast in response.

1A to 1C are procedure cross-sectional views showing an example of an image display element used in such a dry electronic paper and its display drive winry. In the figure, reference numeral 10 denotes a transparent substrate, 20 counter substrate, 30 display electrode (transparent electrode), 40 counter electrode, 50 negative electrode particles, 60 positive electrode particles, and 70 partition walls.

FIG. 1A shows a state in which negatively charged particles 50 and positively charged particles 60 are disposed between opposing substrates (transparent substrate 10 and opposing substrate 20). In this state, when the display electrode 30 side is applied with a voltage such that the low potential counter electrode 40 side has a high potential, as shown in FIG. 1B, the positively charged particles 60 are caused by the coulomb force to display the electrode 30. Emergency moving to the side, the negatively charged particles 50 are moved to the counter electrode 40 side. In this case, the display surface seen from the transparent substrate 10 side is seen as the color of the positively charged particles 60. Next, when the potential is switched to apply a voltage such that the display electrode 30 side has a high potential and the counter electrode 40 side has a low potential, as shown in FIG. 1C, the negatively charged particles 50 are subjected to the Coulomb force. The positive electrode 60 moves toward the display electrode 30 and the positive electrode particles 60 move toward the counter electrode 40. In this case, the display surface seen from the transparent substrate 10 side is seen as the color of the negatively charged particles 60.

1B and 1C can be repeatedly displayed by simply inverting the potential of the power supply, and the color can be reversibly changed by inverting the potential of the power supply. The color of the particles can be freely selected. For example, if the negatively charged particles 50 are made white and the positively charged particles 60 are made black, or if the negatively charged particles 50 are made black and the positively charged particles 60 are made white, the display is white. Reversible display between black is displayed. In this manner, each particle remains in a state of being attached to one electrode by ordinary force, so that even after the power is turned off, the display image is retained for a long time, so that the memory integrity is good.

In addition, in the dry type electronic paper system, since each of the charged particles fly in the gas, the response speed of the image display is high, and the response speed can be 1 msec or less. In addition, like an LCD, an alignment film, a polarizing plate, or the like is unnecessary, and the structure is simple, low cost, and a large area is possible. It can be used from low temperature to high temperature stably against temperature change. It has no viewing angle, high reflectivity, reflective and easy to see in bright places, and low power consumption. It also has memory characteristics, and does not consume power when preserving an image.

Nevertheless, the dry particles used in such a dry electronic paper display element have a change in the amount of charge of the particles when the moisture is generated inside the cell and depend on the state of charge of each particle or the influence of the surrounding environment. Agglomeration may occur when they aggregate with each other. Since dry electronic paper is a dry display device using particle behavior in gas and does not use a solution inside the cell, once moisture is generated, the characteristics of charged particles tend to be more sensitive.

The dry electronic paper image display device constitutes an electronic circuit element inside an airtight case and is sealed with an adhesive polymer having low moisture permeability. However, if moisture and oxygen that penetrate during the encapsulation process and use, and hydrogen generated from electronic circuits due to electrolysis during operation of the device are not removed, the function of the electronic display device gradually decreases or the pressure inside the display device increases. Since there is a side effect of the case, the necessary dehumidifier, oxygen remover, and hydrogen remover to be installed inside. Particularly, in the case of water, the amount of water adsorbed on the accessory and introduced into the electronic display device during the encapsulation process should be removed at an early stage. The performance of the dehumidifying agent, oxygen scavenging agent and hydrogen scavenging agent used in the hermetic image display device is determined by the removal rate, the removal amount and the equilibrium concentration in the equilibrium state. The faster the removal rate, the lower the equilibrium concentration is the better removal agent.

Such dehumidifying substances include dehumidifying substances which remove moisture by physical adsorption, such as silica gel, and dehumidifying substances which remove moisture by chemical reaction. The physical adsorbent has a high equilibrium moisture content and a high temperature dependence, so that it can be used within a normal operating temperature range. There is a disadvantage that the temperature is re-released when the temperature increases.

U.S. Patent 4,405,487 discloses a dehumidifying agent which removes moisture by reacting it with aluminum powder or zinc powder, and removes hydrogen generated by binding to unsaturated organics in the presence of a catalyst, and a method of preparing the same in pellet form by thermocompression bonding. Is disclosed. However, there is a disadvantage in that the rate of removing hydrogen is slow and it is difficult to prepare a dehumidifying agent in the form of a flexible film. Japanese Patent Application Laid-Open No. H3-261091 discloses a dehumidifying agent for organic EL devices in which phosphorus pentoxide powder 90 is placed in a breathable container 80 and mounted inside the organic EL device 100, as shown in FIG. Because of this, it is difficult to use and the phosphoric acid produced by the reaction of phosphorus pentoxide with water has a low melting point of about 41-44 ° C., so it may flow out of the container and contaminate the electronic circuit element even at a normal use temperature. In addition, the Republic of Korea Patent Publication No. 10-2004-78508 describes a water, oxygen, hydrogen remover in the form of a flexible film. However, as shown in FIG. 3, the film-type dehumidifier 130 located next to the electronic circuit 110 of the hermetic electronic device 120 has a disadvantage in that the dehumidification speed is too low due to low moisture permeability of the polymer binder. .

In general, dehumidifying substances that absorb moisture by chemical reactions are mostly solid powders without absorbing moisture, and the dehumidification rate is the fastest. However, in order to be mounted inside a miniaturized and thinner high-tech electronic device, a certain space must be secured and separated into a moisture-permeable diaphragm or put in a moisture-permeable bag so that it occupies a considerable thickness and costs a lot. There is also a method of applying to the interior of the airtight case by vapor deposition or sputtering, but there is a problem that the process is difficult and the unit molecules are expanded after the moisture is absorbed and peeled off from the airtight case to contaminate the inside. Accordingly, there is an urgent need for a dehumidifying agent and a method for effectively removing moisture without disturbing particle movement and charging characteristics in dry electronic paper.

The present invention has been made to solve such a problem, at least one of which is encapsulated with at least one particle between the transparent opposing substrates, by providing an electric field between the substrates by the coulomb force (coulomb force) Image display particles used in dry electronic paper for moving and displaying an image, wherein at least one particle includes a dehumidifying substance for removing moisture, and the image display particle of dry electronic paper, using the same It is to provide an apparatus and a method of manufacturing the same.

In the dry electronic paper image display apparatus, pellets used in a dehumidifying material or a wet type electronic paper by conventional physical adsorption by using charged particles containing a dehumidifying material for removing moisture according to the present invention, It is intended to solve the problem that the case type and film type dehumidifiers are difficult to be applied to dry electronic paper due to the change in charging characteristics and spatial limitations. In addition, it is an object of the present invention to include a dehumidifying material in the image display particles to effectively remove moisture without disturbing the movement and charging characteristics of the particles due to voltage application.

Particles for image display of a dry electronic paper according to the present invention for achieving the above object is at least one is enclosed between the transparent opposing substrates are moved by an electric field applied between the substrates to move the image In the image display particles of dry electronic paper to be displayed, the at least one particle is characterized in that a dehumidifying substance for removing moisture is contained.

Here, the dehumidifying material contained in the image display particles of the dry electronic paper according to the present invention may be any one as long as it can be included in the particles by removing moisture. Preferred examples are dry electrons, characterized in that at least one selected from the group consisting of alkali metal oxides, alkaline earth metal oxides, sulfates, metal halides, perchlorates, phosphorus pentoxide, metal hydrides and metals with greater ionization tendency than hydrogen It is a particle for image display of paper. In particular, at least one metal selected from lithium (Li), potassium (K), sodium (Na), calcium (Ca), barium (Ba), and aluminum (Al) is more preferably ionized than hydrogen. Most preferred.

In addition, the present invention is that the dehumidifying material is contained in the particles in order to reduce the charge change and aggregation of the particles by the moisture generated inside the cell, the image display particles according to the present invention can reduce the aggregation between the particles Forms with additional external additives are also possible. In addition, in order to smoothly transfer the moisture to the dehumidifying material is also preferably a form further comprises a porous material for adsorbing the dehumidifying material, the porous material is silica gel, activated carbon, activated alumina, zeolite, diatomaceous earth, porous resin and Most preferably at least one selected from the group consisting of porous fibers.

In order to achieve the above another object, the image display apparatus of the dry electronic paper according to the present invention encloses at least one particle between at least one transparent opposing substrate, and imparts an electric field between the substrates to coulomb the particles. An image display apparatus which displays an image by moving by a coulomb force, characterized in that the particles for image display of dry electronic paper containing the above-mentioned dehumidifying substance are used as the particles.

And, as another feature of the invention to make a dehumidifying material as described above to a powder of several nanometers (nm) size to several micrometers (㎛) size; The powder-based dehumidifying material is enclosed between at least one of the transparent opposing substrates and moved by an electric field applied between the substrates to form a high speed mixing method on the surface of the image display particles of dry electronic paper which displays an image. Coating or sputtering (sputtering); a method for producing a particle for image display of the dry electronic paper produced by passing through.

Hereinafter, one preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. The invention can be better understood by the following examples, which are intended for the purpose of illustration of the invention and are not intended to limit the scope of protection defined by the appended claims.

4 is a cross-sectional view illustrating an image display particle including a dehumidifying agent contained therein, which is used in an image display apparatus of a dry electronic paper according to an embodiment of the present invention, wherein identification number 1 is a dehumidifying agent and 2 is a porous material. , 3 means a parent particle.

First, the mother particle 3 of the particle | grains for image display of dry type electronic paper used by this invention is demonstrated. The parent particles 3 for image display are negative or positively charged colored particles, and may be any ones that are rapidly moved by the Coulomb force, but spherical and small specific gravity particles are preferable because of their relationship with fluidity. The color is preferably white and / or black. The charge amount of such particles naturally depends on the measurement conditions, but in the image display device, the charge amount of the particles is almost dependent on the initial charge amount, contact with the substrate, contact with other particles, and charge attenuation accompanying elapsed time. The saturation of the charging behavior associated with the contact of the charged particles can be the dominant factor.

The preparation of the mother particles of the image display particles according to the present invention may be carried out by kneading and pulverizing necessary resins, charge control agents, colorants, and other additives, or polymerizing from monomers, and converting existing particles into resins, charge control agents, colorants, and train additives. You may coat. Resin, a charge control agent, a coloring agent, and other additives which comprise the said parent particle are illustrated.

Examples of the resin include urethane resins, urea resins, acrylic resins, polyester resins, acrylic urethane resins, acrylic urethane silicone resins, acrylic urethane fluorine resins, acrylic fluorine resins, silicone resins, acrylic silicone resins, epoxy resins, polystyrene resins, and styrene acrylics. Resins, polyolefin resins, butyral resins, vinylidene chloride resins, melamine resins, phenol resins, fluorine resins, polycarbonate resins, polysulfone resins, polyether resins, polyamide resins, and the like. have. In particular, acrylic urethane resins, acrylic silicone resins, acrylic fluorine resins, acrylic urethane silicone resins, acrylic urethane fluorine resins, fluorine resins, and silicone resins are suitable from the viewpoint of controlling adhesion to the substrate. Although there is no restriction | limiting in particular as a charge control agent, For example, as a negative charge control agent, a salicylic acid metal complex, a metal-containing azo dye, the oil-soluble dye containing a metal (including metal ion or a metal atom), a quaternary ammonium salt type compound, and a calix arene Compounds, boron-containing compounds (boron benzyl nitrate complex), nitroimidazole derivatives, and the like. 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 thereof, salts, resins containing various organic pigments, fluorine, chlorine, nitrogen and the like can also be used as charge control agents. . The colorant is not particularly limited, and various organic and inorganic pigments and dyes may be used, and examples thereof include dyes such as basic and acid, and nigrosine, methylene blue, quinoline yellow, and rose bengal. It can be illustrated. Examples of the inorganic additives include titanium oxide, zinc oxide, zinc sulfide, antimony oxide, calcium carbonate, lead white, talc, silica, calcium silicate, alumina white, cadmium yellow, cadmium red, cadmium orange, titanium yellow, cyanide, Ultramarine blue, cobalt blue, cobalt green, cobalt violet, iron oxide, carbon black, manganese ferrite black, cobalt ferrite black, copper powder, aluminum powder, and the like.

When an image display mother particle is used as a mixture of two or more kinds of colors and different charge characteristics, each particle ideally follows the electric field inversion, and the surface charge density of each particle is optimized with each other, and the average particle diameter is reduced. It is preferable to carry out in a certain range. In addition, it is preferable that each particle has an average particle diameter, and that each particle can be moved by each method in an equal amount. In other words, each particle having two or more kinds of colors and different charging characteristics moves only when a voltage is applied, and the movement or charging characteristics of the particles are not changed by the external environment, in particular, moisture, and it is desirable not to cause aggregation. Do.

The present invention is characterized in that the form containing a dehumidifying material for removing moisture in the mother particles as described above, the technical features of the present invention will be described in detail with respect to the dehumidifying material contained therein.

The present invention is an image display particle used in a dry type image display device, wherein the dry type image display device encloses at least one particle between at least one of the transparent opposing substrates, and imparts an electric field between the substrates. It refers to a device that displays an image by moving particles by a coulomb force. The first feature of the present invention is an image display particle used herein, and as shown in Fig. 4, at least one mother particle 3 has a form in which a dehumidifying substance 1 for removing moisture is included.

The inventors have found that the particles for image display used in a dry image display apparatus can be suitably used as particles for image display which can remove moisture by including a dehumidifying agent in the mother particles. The dehumidifying material capable of removing moisture from the image display particles according to the present invention may be included or coated in the mother particle, and the kind includes any material capable of removing moisture. Preferably it may be selected from alkali metal oxides, alkaline earth metal oxides, sulfates, metal halides, perchlorates, phosphorus pentoxide, metal hydrides, metals having a higher ionization tendency than hydrogen, or mixtures thereof, in particular the hydrogen More preferably, at least one metal selected from the group consisting of lithium (Li), potassium (K), sodium (Na), calcium (Ca), barium (Ba), and aluminum (Al) is more preferred.

Conventional physical adsorbents have a disadvantage in that the equilibrium moisture concentration is high and the temperature dependency is high, so that the water is re-released when the temperature is high even within the normal use temperature range. In addition, the pellet-type dehumidifier is also included in the fluid of the wet type electronic paper, rather than the dehumidifying agent is contained in the parent particles, there is a disadvantage that the slow removal of hydrogen, it is difficult to manufacture the dehumidifying agent in a flexible film form. . In addition, the dehumidifying powder contained in the breathable container in the form of powder requires a separate breathable container, so the manufacturing process is complicated and there is a limit to miniaturization. In addition, the dehumidifying agent in the form of a film also had problems due to the space constraints and the charging characteristics of the particles due to the production of a separate film.

However, in the case of the image display particles of the dry electronic paper according to the present invention, the dehumidifying agent used in the dehumidifying material or the wet type electronic paper by the conventional physical adsorption, the dehumidifying agent in the form of a film, the type of film, the change of charging characteristics And it is possible to solve the problem that was difficult to apply in dry electronic paper due to space limitations. That is, in the case of using the charged particles containing the dehumidifying material to remove the moisture according to the present invention, by including the dehumidifying material in the image display particles effectively moisture without disturbing the movement and charging characteristics of the particles due to voltage application Could be removed.

By designing the charged particles by adding a dehumidifying material that can remove moisture inside the mother particles as described above, it is possible to fundamentally prevent the problem that the movement of the particles changes or the charge characteristics change due to moisture. By ensuring a sufficient distance between the particles it is possible to reduce the aggregation and aggregation of the particles. As a result, it is possible to significantly reduce the driving voltage for moving the charged particles, and to improve the fluidity of the particles during repeated movement of the charged particles and to increase the stability of the particles during storage.

The method of complexing the mother particle and the dehumidifying material in the image display particles of the dry electronic paper according to the present invention may be a mechanochemical method of immobilizing the dehumidifying material on the surface of the mother particle by mechanical energy imparting or the like. It may include a mechano-fusion method of diffusion-immobilized by applying thermal energy by applying mechanical energy to the magnetic particles on the surface of the mother particles, or a graft method for chemically bonding a dehumidifying substance to the surface of the mother particles. Preferably, by depositing or sputtering a dehumidifying substance on the mother particles of the image display particles, that is, the target particles, the dry electronic paper image display particles according to the present invention can be manufactured, which is the dehumidifying method. The most preferred method is to make the material from several nanometers (nm) in size to several micrometers (μm) in size and to coat the surface of the parent particles by high-speed mixing or to mix the liquid in a liquid phase, followed by coating or sputtering.

Another feature of the present invention is a particle for image display of dry electronic paper, wherein an external additive for reducing agglomeration between particles is further included in the charged mother particles as described above. The external additive according to the present invention is used not only to prevent the aggregation of the electrophoretic particles but also to increase the fluidity of the electrophoretic particles.

These external additives are related to the charge amount change of the particles and the aggregation of the particles together with the dehumidifying material according to the present invention, as shown in Figure 4 together with the dehumidifying material (1) to remove moisture in the present invention When (2) is further included, it is possible to reduce the agglomeration or aggregation of particles between particles to improve the fluidity of the particles during repeated movement of the charged particles and to increase the stability of the particles during storage.

Such external additives serve as charge control agents for improving the fluidity of the particles, the components of which can be constructed from materials over a wide range of molecular weights (low molecular weight, oligomeric, or polymerizable), and can be pure or mixed. Electrophoretic charged particles added with an external additive according to the present invention may be added to the non-aqueous medium in order to increase electrophoresis or increase static stabilization. Although not limited thereto, glycol ethers, acetylene glycols, alkanolamides, sorbitol derivatives, alkyl amines, quaternary amines, imidazolines, dialkyl oxides and sulfosuccinates may be used, preferably nano size It is suitable to use silica. In addition, the charged particles may be combined with a graft chain functional group present on the surface of the external additive by a graft reaction, and the introduced functional group is preferably determined in consideration of the suitability with the external additive polymer to be graft polymerized.

Still another feature of the present invention is a particle for image display of dry electronic paper, further comprising a porous material for adsorbing the dehumidifying material to the charged mother particles as described above. In the present invention, the porous material functions as a carrier of the dehumidifying material or as a passage for water transfer. That is, in performing the function of removing moisture from the dehumidifying material according to the present invention, it is for effectively delivering water to the dehumidifying material inside the charged particles.

Almost all porous materials alone are hygroscopic by physical adsorption, but the equilibrium moisture concentration is very high, and the moisture is released again when the temperature rises, so that it is insufficient as a moisture absorbent for electronic devices sensitive to moisture. In addition, in the present invention, the porous material is adjacent to the chemical dehumidification material is immediately deprived of moisture, so the function of the dehumidifying agent is negligible, and by adsorbing the dehumidifying material according to the present invention, the dehumidifying material more effectively moisture. This will allow you to remove.

The porous material refers to a granular material having a diameter of 1 mm or less or a fibrous solid material having a diameter of 1 mm or less in which fine pores having a diameter of 0.4 nm to 50 microns are formed. It is preferred to be prepared by selecting from a mixture thereof, or a mixture thereof.

Another preferred embodiment for achieving another object of the present invention is an image display apparatus of dry electronic paper using the image display particles as described above. Such an image display apparatus of dry electronic paper encloses at least one kind of particles between at least one of the transparent substrates, and imparts an electric field therebetween to move the particles by a coulomb force to move the image. It is an image display apparatus to display, It is characterized by using the above-mentioned image display particle of dry electronic paper as said particle | grain.

FIG. 5 is a cross-sectional view showing an example of an image display device using an image display particle of dry electronic paper according to an embodiment of the present invention, wherein identification number 4 is an upper substrate, 5 is an opposite substrate, and 6 is charged particles. , 7 means bulkhead. In the image display apparatus according to the present invention, as shown in Fig. 5, the above-mentioned transparent upper substrate 4 and the opposing substrate 5 and the above-described image display particles according to the present invention positioned between these substrates are charged positively or negatively. It consists of the charged particles 6 and the partition wall 7 is installed as needed.

In the image display apparatus of the present invention, the transparent upper substrate 4 is a transparent substrate capable of confirming the color of the charged particles 6 from the outside of the apparatus, and a material having high transmittance of visible light and good heat resistance is suitable. The presence or absence of flexibility as an image display apparatus is suitably selected according to a use, For example, a flexible material is suitable for the use of the electronic paper which concerns on this invention. Examples of the substrate material include polymer sheets such as polyethylene terephthalate, polyether sulfone, polyethylene and polycarbonate, and inorganic sheets such as glass and quartz. The substrate thickness is preferably 2 to 5000 µm, preferably 5 to 1000 µm. If the thickness is too thin, it is difficult to maintain the strength and the uniformity of the spacing between the substrates. If the thickness is too thick, the sharpness and contrast of the display function are reduced. In particular, in the case of electronic paper applications, flexibility is lacking.

You may form an electrode in a board | substrate as needed. When the electrode is not formed on the substrate, an electrostatic latent image is formed on the outer surface of the substrate, and the colored fractionation body charged with a predetermined characteristic with an electric field generated by the electrostatic latent image is attracted to or repelled by the electrostatic latent image. A correspondingly arranged sorting body is viewed from the outside of the display device through the transparent substrate. In addition, the electrostatic latent image is formed by transferring an electrostatic latent image performed in a conventional electrophotographic system using an electrophotographic photosensitive member onto a substrate of the image display apparatus of the present invention or directly forming an electrostatic latent image on a substrate by ion flow. It can carry out by such a method. In the case of providing the electrode on the substrate, electrostatic latent image is applied by attracting or repulsing a color classification body charged with a predetermined characteristic by an electric field generated at each electrode position on the substrate by an external voltage input to the electrode portion. The sorted bodies are arranged on the outside of the display device through the transparent substrate. The electrode at this time is formed of a transparent and patternable conductive material. Examples thereof include metals such as indium oxide and aluminum, conductive polymers such as polyaniline, polypyrrole and polythiophene, and vacuum deposition and coating. The formation method of can be illustrated. In addition, the electrode thickness can ensure the conductivity and there is no problem in light transmittance, and 3 to 1000 nm, preferably 5 to 400 nm is preferable. In this case, the external voltage input may overlap DC or AC.

In the image display apparatus of the present invention, it is preferable to form a partition wall connecting the opposing substrates and to configure the display portion by a plurality of display cells in order to prevent extra movement in the substrate parallel direction of the charged particles. The shape of the partition wall is appropriately optimally set according to the size of the sorting body related to the display and is not limited in general, but the width of the partition wall is 10 to 1000 µm, preferably 10 to 500 µm, and the height of the partition is 10 to 5000 µm, Preferably it is adjusted to 10-500 micrometers. Moreover, when forming a partition, both the rib method which joins after forming a rib in each of the opposing board | substrates, and the convenient rib method which forms a rib only on the board | substrate of one side can be considered. In the image display apparatus of this invention, joining is considered. In order to prevent the shift | offset | difference at the time of a partition, formation of the partition by the convenient method is preferable.

As described above, the present invention provides a method of encapsulating at least one particle between at least one of the opposing substrates, and providing an electric field between the substrates to move the particles by coulomb force to display an image. An image display particle used in dry electronic paper, wherein at least one particle contains a dehumidifying substance for removing moisture, thereby producing an image display particle of dry electronic paper and dehumidifying the inside of charged particles. Characterized in that it contains a substance.

In the case of the image display particles of the dry electronic paper of the present invention, the dehumidifying agent used in the dehumidifying material or the wet electronic paper by the conventional physical adsorption, the dehumidifying agent in the form of a film, the type of film and the change of the charging characteristics and Due to the space limitation, it is difficult to apply the dry type electronic paper. By designing charged particles by adding a dehumidifying substance that can remove moisture inside the mother particles, it is possible to fundamentally prevent the problem that the movement of particles or the charging characteristics change due to moisture, and thus the distance between particles. By sufficiently securing the agglomeration, it is possible to reduce agglomeration or aggregation of particles. As a result, the driving voltage for moving the charged particles can be significantly reduced, and the particles have an effect of improving the fluidity of the particles and increasing the stability of the particles during storage.

In addition, in the case of using a charged particle containing a dehumidifying material for removing moisture according to the present invention in an image display device of dry electronic paper, since the dehumidifying material is contained inside the image display particle, There is an effect that can effectively remove moisture without disturbing the movement and charging characteristics.

Claims (8)

A dry type electronic paper image display particle of which at least one is enclosed between at least one transparent substrate and moved by an electric field applied between the substrates to display an image, Particles for image display of dry electronic paper, characterized in that the at least one particle contains a dehumidifying material for removing moisture. The method of claim 1, wherein the dehumidifying material is at least one selected from the group consisting of alkali metal oxides, alkaline earth metal oxides, sulfates, metal halides, perchlorates, phosphorus pentoxides, metal hydrides and metals having a greater tendency to ionize than hydrogen. Particles for image display of dry electronic paper. The method of claim 2, wherein the metal having a higher ionization tendency than hydrogen is at least one of lithium (Li), potassium (K), sodium (Na), calcium (Ca), barium (Ba), and aluminum (Al). The particle | grains for image display of dry electronic paper characterized by the above-mentioned. The particle for image display of dry electronic paper according to claim 1, further comprising an external additive for reducing agglomeration between particles. The particle for displaying images of dry electronic paper according to claim 1, further comprising a porous material for adsorbing the dehumidifying material. The particle of claim 5, wherein the porous material is at least one selected from the group consisting of silica gel, activated carbon, activated alumina, zeolite, diatomaceous earth, porous resin, and porous fiber. At least one of which is an image display device which encloses at least one kind of particles between transparent opposing substrates, imparts an electric field between the substrates, moves the particles by a coulomb force, and displays an image. An image display apparatus for dry electronic paper, wherein the image display particles of dry electronic paper obtained in claim 1 are used. Making the dehumidifying material into a powder of several nanometers (nm) in size to several micrometers (µm) in size; The powder-based dehumidifying material is enclosed between at least one of the transparent opposing substrates and moved by an electric field applied between the substrates to form a high speed mixing method on the surface of the image display particles of dry electronic paper which displays an image. Coating or sputtering (sputtering); The method for producing a particle for image display of dry electronic paper, characterized in that consisting of.

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