WO2013054969A1 - Particules électrophorétiques et leur procédé de fabrication - Google Patents

Particules électrophorétiques et leur procédé de fabrication Download PDF

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WO2013054969A1
WO2013054969A1 PCT/KR2011/007925 KR2011007925W WO2013054969A1 WO 2013054969 A1 WO2013054969 A1 WO 2013054969A1 KR 2011007925 W KR2011007925 W KR 2011007925W WO 2013054969 A1 WO2013054969 A1 WO 2013054969A1
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particles
magnetic particles
electrophoretic
charged
mother
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PCT/KR2011/007925
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English (en)
Korean (ko)
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정민영
이용의
김철환
김재환
라해진
박범우
최용길
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주식회사 이미지앤머터리얼스
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Publication of WO2013054969A1 publication Critical patent/WO2013054969A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/165—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on translational movement of particles in a fluid under the influence of an applied field
    • G02F1/166—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect
    • G02F1/167—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect by electrophoresis
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/165—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on translational movement of particles in a fluid under the influence of an applied field
    • G02F1/1675—Constructional details
    • G02F2001/1678—Constructional details characterised by the composition or particle type
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2202/00—Materials and properties
    • G02F2202/36—Micro- or nanomaterials

Definitions

  • the present invention relates to display technology, and more particularly, to electrophoretic particles and methods for their preparation.
  • an electrophoretic display device uses a phenomenon in which charged particles move by an electric field applied between two electrodes.
  • the wet electrophoretic display device uses a particle dispersion solution in which the charged particles are dispersed in an insulating liquid fluid.
  • the particles may have one kind of color or may include different kinds of particles having two or more kinds of colors.
  • the electrical polarities of these particles are generally opposite to each other, but may be independently controlled by the difference in electrophoretic mobility even though they have the same polarity.
  • the electrophoretic display device displays information by particles having electrical polarity, dispersion characteristics must be maintained while the electrical properties of the particles are maintained in various environments in which the product is used.
  • various display devices have been combined with vehicle information systems.
  • a harsher temperature range for example, a high temperature environment of 70 ° C. or higher, unlike room temperature.
  • Such high temperature durability is also important in general user environments such as outdoors.
  • the technical problem to be achieved by the present invention is to provide electrophoretic particles having excellent display quality and bistable stability in a wide operating temperature range by having excellent dispersion characteristics at room temperature as well as at high temperature.
  • Another technical problem to be achieved by the present invention is to provide a method for producing electrophoretic particles having the aforementioned advantages.
  • Electrophoretic particles according to an embodiment of the present invention for solving the technical problem, the charged mother particles; And a core structure including a plurality of magnetic particles externally attached to the surface of the mother particle. And a polymerization dispersion layer on the core structure.
  • the polymerization dispersion layer may be formed on the surface of the plurality of magnetic particles.
  • the mother particle may include a charged polymeric binder and a colorant dispersed in the polymeric binder.
  • the diameter of the parent particles is in the range of 400 nm to 3 ⁇ m
  • the diameter of the plurality of magnetic particles is in the range of 10 nm to 300 nm
  • the plurality of magnetic particles are the mother particles It can be externalized to have a coverage of less than 100% on the surface.
  • the ratio of the average diameter of the mother particles to the average diameter of the plurality of magnetic particles may be in the range of 1/300 to 1/10.
  • the plurality of magnetic particles may include metal oxides, metal salts, or monoatomic metals or alloys.
  • the plurality of magnetic particles may include a polymer of polyester, styrene-acrylic, methyl methacrylate series.
  • the polymerization dispersion layer may include a styrene or an acrylate polymer.
  • Electrophoretic particles for solving the other technical problem, providing a charged mother particle; Externalizing a plurality of magnetic particles on the charged mother particles to expand the surface area of the charged mother particles; And forming a polymerization dispersion layer on a surface of the plurality of magnetic particles.
  • the plurality of magnetic particles may be externalized to have a coverage of less than 100% on the charged parent particles.
  • the polymerization dispersion layer may include a styrene or an acrylate polymer.
  • externalizing the plurality of magnetic particles on the charged mother particles may be performed by bead milling.
  • Electrophoretic particles according to another embodiment of the present invention for solving the other technical problem, providing a charged mother particle; Providing a plurality of magnetic particles having a polymerization dispersion layer formed on a surface thereof; And externally enlarging a plurality of magnetic particles having the polymerization dispersion layer formed on the charged mother particles, thereby expanding the surface area of the charged mother particles.
  • the plurality of magnetic particles may be externally attached to have a coverage of less than 100% on the charged mother particles, and the polymerization dispersion layer may include a styrene or an acrylate polymer. Also, externalizing the plurality of magnetic particles on the charged mother particles is preferably performed by bead milling.
  • the effective surface area may be extended by a plurality of magnetic particles externally attached to the charged mother particle, and a polymer dispersion layer may be formed on the extended effective surface area.
  • the bonding area of the polymerization dispersion layer may be maximized, and the dispersion stability of the electrophoretic particles in the wet electrophoretic display pixel may be improved, and excellent display quality and bistable stability may be obtained at room temperature as well as at high temperature.
  • the immersed density of the electrophoretic particles is reduced by the polymerization dispersion layer in the insulating fluid, and thus the electrophoretic particles can be obtained by increasing the electrical mobility.
  • FIG. 1 is a cross-sectional view schematically showing the structure of electrophoretic particles in one embodiment of the present invention.
  • FIG. 2 is a view schematically showing an electrophoretic pixel according to an embodiment of the present invention.
  • FIG. 3 is a cross-sectional view showing an electrophoretic display device according to an embodiment of the present invention.
  • first, second, etc. are used herein to describe various members, parts, regions, and / or parts, these members, parts, regions, and / or parts should not be limited by these terms. Is self explanatory. These terms are only used to distinguish one member, part, region or part from another region or part. Thus, the first member, part, region, or portion, which will be described below, may refer to the second member, component, region, or portion without departing from the teachings of the present invention.
  • FIG. 1 is a cross-sectional view schematically showing the structure of an electrophoretic particle 100 according to an embodiment of the present invention.
  • the electrophoretic particle 100 includes a core structure 15.
  • the core structure 15 may include the mother particle 10 and a plurality of magnetic particles 20 on the surface of the mother particle 10.
  • the parent particle 10 may be charged to have a positive or negative charge for electrophoresis.
  • the parent particles 10 may include a polymeric resin material colored by pigments and / dyes for information display.
  • the diameter of the designed mother particle 10 is 400 nm to 3 ⁇ m, it is possible to ensure a suitable electric mobility within the above range.
  • the polymer resin material may be, for example, urethane resin, urea resin, acrylic resin, polyester resin, acrylic urethane resin, acrylic urethane Acrylic resins, acryl urethane fluoro-carbon polymers, acryl fluorocarbon polymers, silicone resins, acrylic silicone resins, polystyrene Polystyrene resin, styrene acrylic resin, polyolefin resin, butyral resin, vinylydinene chloride resin, melamine resin, phenol Phenolic resins, fluorocarbon polymers, polycarbonate resins, polysulfon resins, polyether resins polymeric resin materials such as esin), polyethylene resins, and polyamide resins, and these materials may be used in combination of two or more materials.
  • the polymer resin material may be gelatin, alginic acid, latex polymer, polystyrene, polyvinyl formal, polyvinyl butyral, polymethyl acrylate, polybutyl acrylate, poly It may also be formed from any one of methyl methacrylate, polybutyl methacrylate or in combination with those described above.
  • the parent particles 10 colored by the pigment and / or dye may have any one of red, green and blue, one of magenta, cyan and yellow, or white, or black. If necessary, the parent particles 10 may be transparent without including pigments and / or dyes so as not to have color.
  • the pigments and dyes may be commercially suitable materials.
  • the pigment may be inorganic fine particles having a particle diameter of about 0.05 ⁇ m to several ⁇ m and dispersed in the polymer resin.
  • the dyes may be commercial acid dyes, oil-soluble dyes, disperse dyes, reactive dyes, direct dyes, and the like.
  • a cationic or negative charge control agent may be combined with the polymer resin material.
  • the positive charge control agent may be, for example, a nigrosine dye, a trih-enylmethane compound, the fourth grade ammonium salt-based compound, It may be any one or combination of polyamine resins and imidazole derivatives.
  • the negative charge control agent may be, for example, a salicylic acid metal complex, a metal containing azo dye, an oil-soluble dye of metal-containing, a quaternary
  • the fourth grade ammonium salt-based compound, calixarene compound, boron-containing compound such as the benzyl acid boron complex, and nitroimi Nitroimidazole derivatives The materials described above are exemplary and the present invention is not limited thereby, and other known suitable materials may be used.
  • the plurality of magnetic particles 20 may be organic particulates, inorganic particulates, or a combination thereof.
  • the magnetic particles 20 may be designed to be smaller than the parent particles, and have a diameter in the range of 10 nm to 300 nm. When the size of the magnetic particles 20 is less than 10 nm, not only is it difficult to form a polymerization dispersion layer to be described later, but it is also difficult to obtain the effect of reducing the particle density of the particles.
  • the organic fine particles may be, for example, a polymer of polyester, styrene-acrylic or methyl methacrylate series.
  • the organic fine particles may be formed by a pulverization or polymerization reaction, and preferably may be formed by a polymerization reaction in which the particle size distribution is easily controlled.
  • the polymerization reaction can be carried out by emulsion polymerization / aggregation or suspension polymerization.
  • the inorganic fine particles may include, for example, metal oxides such as titanium oxide, zinc sulfide, cerium oxide, aluminum oxide, barium titanium oxide, or metal salts such as calcium carbonate, calcium oxide, and kaolin, or monoatomic metals or alloys. Can be. However, these materials are illustrative only and the present invention is not limited thereto.
  • the inorganic fine particles include other metal particles such as Si, Ti, Sr, Al, Zn, Ba, Sb, Ce, Pd, oxides thereof, nitrides thereof, oxygen nitrides thereof, salts thereof, or Other suitable materials, including combinations thereof.
  • the fine particles described above may be externalized on the surface of the parent particle 10.
  • a bead milling method or a graft polymerization method by a chemical method may be used to fix the fine particles to the surface of the parent particle 10 by a mechanical method.
  • the plurality of magnetic particles 20 may be externalized by bead milling.
  • the mother particle 10 and the child particle 20 are put together in the chamber together with the zirconia beads, and then the milling process is performed while controlling the milling time and the amount of the bead.
  • the core structure 15 is obtained.
  • the beads may simply be removed via a filtration process.
  • Such bead milling has an advantage of high recovery rate because the process is simpler than the graft polymerization method by the chemical method, and the process of removing the residual monomer after the graft polymerization is unnecessary.
  • the ratio of the average diameter of the parent particle 10 to the average diameter of the plurality of magnetic particles 20 may be in the range of 1/300 to 1/10.
  • the average diameter of the magnetic particles 20 is less than 1/300 of the average diameter of the mother particles 10
  • the surface coverage of the mother particles by the plurality of magnetic particles may be rapidly increased, so that the effective surface area may be rather reduced. Dispersion stability may be impaired.
  • the average diameter of the magnetic particles 20 is less than 10 nm, it is difficult to provide a polymerization dispersion layer to be described later on the plurality of magnetic particles 20.
  • the average diameter of the magnetic particles 20 exceeds 1/10 of the average diameter of the mother particles 10, for example, the magnetic particles exceeding 300 nm with respect to the mother particles 10 having a 3 ⁇ m average diameter.
  • the adhesion stability of the magnetic particles 20 is reduced after the above-mentioned external addition process.
  • the plurality of magnetic particles 20 externally attached on the surface of the parent particle 10 is preferably separated from each other.
  • the weight of the core particles is increased as compared with the effect of increasing the surface area, thereby reducing the mobility of the electrophoretic particles. Therefore, in order to increase the mobility while maximizing the effective surface area of the core structure 10, the plurality of magnetic particles 20 are discontinuously or discretely so that the plurality of magnetic particles 20 have a coverage of less than 100% on the surface of the mother particle 10. It is preferable to externally add.
  • the polymeric dispersion layer 30 is provided on the core structure 15 having an effective surface area extended three-dimensionally by the plurality of magnetic particles 20. Compared with providing the polymer dispersion layer 30 on the parent particles 10, when providing the polymer dispersion layer 30 on the core structure 15 having an extended effective surface area, more polymer dispersion layer ( 30) may be combined to reduce the particle density of the particles, thereby improving particle mobility and bistable stability.
  • the polymerization dispersant constituting the polymerization dispersion layer 30 may be chemically bonded to the organic fine particles.
  • the organic fine particles and the polymeric dispersant may be bonded to each other through acid base reactions, ionic bonds, covalent bonds, hydrogen bonds, ⁇ electron bonds, or a combination thereof between suitable functional groups.
  • the polymerization dispersant may be physically coated or adsorbed on the inorganic fine particles.
  • the polymerization dispersant may be prepared by free radical polymerization of one or more types of monomers which are not saturated. Suitable free radical polymerization reactions may include suspensions, emulsions, dispersions and preferably solution polymerizations. The manufacturing methods listed are exemplary and the present invention is not limited thereto.
  • the polymerization dispersant is a polymer having at least one monomer repeating step, and may be, for example, a styrene or an acrylate polymer.
  • the polymer for the polymeric dispersant may have suitable functional groups that can chemically interact with the surface of the magnetic particles as described above.
  • the surface of the magnetic particles and the polymerization dispersant are hydrogen bonded, the surface of the magnetic particles may be formed of a pyridinium group, an imidazorium group, and a quaternary ammonium group.
  • the same may include a hydrogen donor, and the polymerization dispersant may include a hydrogen upsector, such as a ketone group, a sulfonate group, a pyridinine group, or a carboxykate group. .
  • the polymerization dispersant may have a functional group capable of performing a suitable crosslinking reaction when coated on the inorganic fine particles.
  • the above-described polymerization dispersion layer 30 may be first formed on the surfaces of the magnetic particles 20 before externally attaching the magnetic particles 20 to the mother particles 10.
  • the core structure 15 is first formed by externally attaching the magnetic particles 20 to the mother particle 10, and then, on the magnetic particles 20 of the core structure 15, a polymerization dispersion layer ( 30) may be formed.
  • the polymerization dispersion layer 30 may be further formed by the above-described mechanism on the surface of the parent particle 10 which is not covered with the plurality of magnetic particles 20.
  • cationic polyester was used as the binder resin
  • carbon black was used as the black pigment
  • mother particles having positive charge were prepared using Bontron E84 available from Orient Co. as the charge control agent. It was. Specifically, about 1.0 g of cationic polyester is dissolved in 20 ml of methyl ethyl ketone, which is an organic solvent, and about 0.4 g of carbon black is added thereto and mixed to prepare a dispersion. Subsequently, after dissolving Bontron NO7 as a charge control agent in the dispersion, a polymer compound was induced to prepare a mother particle.
  • a dispersion of SiO 2 having a hydrophilic surface before surface treatment was prepared, and an alkoxyamine terminated with triethoxyl in -OH group on the surface of SiO 2 was used. Terminated Alkoxyamine) is grafted. Subsequently, when the styrene-based monomer is polymerized in the dispersion, the styrene-based dispersed polymer layer may be grafted with SiO 2 particles.
  • SiO 2 magnetic particles in which the styrene-based dispersion polymerization layer was formed were mixed by 0.5 wt% based on the packing weight of the mother particles and the magnetic particles, and a bead milling process using zirconia beads was performed to carry out the bead milling process according to Example 1 of the present invention.
  • Black electrophoretic particles were prepared.
  • the prepared electrophoretic particles have a core structure in which the parent particles having an average size of 800 nm are externally attached to the mother particle surface with a coverage of 40% to less than 60% of the magnetic particles having a size of 10 nm to 30 nm.
  • Example 2 As described in Example 1, after preparing the mother particles containing carbon black-containing mother particles and the styrene-based dispersion polymerization layer, 10 wt% of the magnetic particles were added to the mother particles and the weight of the magnetic particles. After mixing, the bead milling process was performed to prepare black electrophoretic particles according to Example 2 of the present invention.
  • the prepared electrophoretic particles have a core structure in which the parent particles having an average size of 800 nm are externally attached to the surface of the mother particles with a coverage of 60% to less than 80% of the magnetic particles having a size of 10 nm to 30 nm.
  • positively charged black electrophoretic particles were prepared in which the dispersant was directly bonded to the above-described parent particles.
  • Example 1 After preparing the mother particles having the carbon black-impregnated mother particles and the styrene-based dispersion polymerization layer, the mother particles and the particles
  • the black electrophoretic particles according to Example 2 of the present invention were prepared by mixing 25 wt% of the magnetic particles with respect to the packed weight and performing a bead milling process.
  • the prepared electrophoretic particles have a core structure in which parent particles having an average size of 800 nm are externally attached to the surface of the mother particles with a coverage of 100% or more.
  • White electrophoretic particles are prepared to be dispersed together with the black electrophoretic particles according to Examples 1 and 2 and Comparative Examples described above to constitute a two-particle wet electrophoretic pixel.
  • the white electrophoretic particles similar to the above black electrophoretic particles, used anionic polyester as a binder resin, TiO 2 as a white pigment, and negatively using Bontron P84 available from Orient as a charge control agent. Charged.
  • the electrophoretic particle dispersion was prepared by dispersing the above-mentioned black electrophoretic particles and white electrophoretic particles in Isopar G (specific gravity 0.75), which is an electrically insulating fluid, and then charged into an experimental electrophoretic display pixel to display contrast, Bistable and high temperature stability were evaluated.
  • Table 1 below shows the evaluation results of Examples 1 and 2 and Comparative Examples 1 and 2.
  • the contrast ratio is the ratio (% W /% K) of the reflectance observed when white electrophoretic particles float to the front of the pixel and the reflectance (% K) observed when black electrophoretic particles float to the front of the pixel. )to be.
  • the reflectance measurement was carried out to produce an experimental electrophoretic pixel, irradiated with halogen light as a light source in the dark room and evaluated the luminance of the reflected light using a luminance measuring device (CS-200) of Konica Minolta Co. (Konica Minolta Co.). A standard white reflector (SRS-99) from Labspher Co. was used.
  • the bistableness measures the initial reflectance of the white electrophoretic particles and the black electrophoretic particles, and then measures the reflectance after storage for 24 hours in a dispersed state maintained with the power off, thereby evaluating the difference in reflectance ( ⁇ L * ). It is.
  • Thermal stability measures the reflectance by the same method as the above after 240 hours passed at 70 degreeC, and evaluates the difference ( ⁇ L * ) between the initial reflectance and the reflectance after 240 hours.
  • Table 1 reflectivity Contrast Bistable ( ⁇ L * ) Thermal Stability ( ⁇ L * ) [70 °C, 240 hours] % W % K White black White black Example 1 40.8% 4.1% 9.95 -3.5 1.7 -1.8 1.5 Example 2 39.5% 3.7% 10.68 -2.8 0.9 -1.5 1.3 Comparative Example 1 41.5% 4.2% 9.89 -6.5 2.1 -10.3 5.4 Comparative Example 2 35% 5% 7 -10 3 -11.3 5.8
  • Example 1 in which 5 wt% of the particles are attached and Example 2 in which 10 wt% of the particles are attached, the external coverage of the particles is less than 100%, and as the amount of the particles increases, The contrast ratio increases, and the bistable and thermal stability tend to improve. This is because, as the amount of the magnetic particles on which the polymer dispersion layer is formed increases, the immersion density of the electrophoretic particles decreases, and the dispersion stability increases.
  • the dispersion solution according to Comparative Example 2 had a degree of contrast that was difficult to be commercialized, and although not indicated, a continuous magnetic particle coating layer of one to two or more layers was formed on the surface of the mother particle by addition of excess magnetic particles. The haptic density was also shown to decrease the driving speed.
  • the parent particles have an average particle diameter of 800 nm, but this is exemplary and, as described above, exhibits bistable and thermal stability while having optimal display quality and driving characteristics in a wet electrophoretic display device.
  • the diameter of the mother particles is in the range of 400 nm to 3 ⁇ m
  • the diameter of the magnetic particles forming the core structure of the particles is in the range of 10 nm to 30 nm and is smaller than the diameter of the mother particles from 10 nm to 300 nm. It may be in the range of.
  • FIG. 2 is a diagram schematically showing an electrophoretic pixel 200 according to an embodiment of the present invention.
  • the electrophoretic pixel 200 may include two or more subpixels adjacent to each other.
  • the electrophoretic pixel 200 may include a plurality of color subpixels 200Y, 200M, and 200C.
  • the color subpixels 200Y, 200M, and 200C may be yellow, magenta, and cyan subpixels, respectively.
  • the particle dispersion solution DU may be provided in the color sub pixels 200Y, 200M, and 200C.
  • the particle dispersion solution DU is dispersed in the electrically insulating fluid 31 and the color electrophoretic particles 100Y, 100M, and 100C having the core structure described above and having a corresponding color, for example, yellow, magenta, and cyan. ) And black electrophoretic particles 100K.
  • the color sub pixels 200Y, 200M, 200C may be red, green and blue sub pixels, for example.
  • the color subpixels 200Y, 200M, 200C are colored electrophoretic particles 100Y, 100M having the corresponding color, for example, red, green, and blue, together with the aforementioned black electrophoretic particles 100K. , 100C).
  • only one kind of particles of the color electrophoretic particles 100Y, 100M, 100C and the black electrophoretic particles 100K in each sub-pixel may have a core structure.
  • the electrophoretic pixel 200 further adds a white subpixel 200W adjacent to the aforementioned color subpixels 200Y, 200M, 200C to increase the white and black saturation to further enhance the contrast ratio. It may include.
  • the white subpixel 200W may include white electrophoretic particles 100W together with the black electrophoretic particles 100K as described above.
  • the electrophoretic pixel 200 may further include transparent particles having no color along with the color electrophoretic particles and the black electrophoretic particles.
  • the subpixels constituting the electrophoretic pixel 200 may be arranged in a quadrangular shape, as shown in FIG. 2, but this is exemplary.
  • the sub-pixels constituting the electrophoretic pixel 200 may be arranged in the form of a line, or may have a polygonal shape such as hexagon, octagon, concentric circles, or a combination thereof, but the present invention is not limited thereto.
  • FIG. 2 illustrates the microcapsule 200S as a means for storing the particle dispersion solution DU, this is exemplary, and the cavity is defined by a partition structure as described below between each pixel or subpixel.
  • the microcapsules 200S may be defined within the cavity, or the particle dispersion solution may be stored directly in the cavity without the microcapsules 200S.
  • the particle dispersion solution may be stored in a known microcup structure or other various types of cavity structures, polymer dispersed structures, but the present invention is not limited thereto.
  • FIG. 3 is a cross-sectional view of an electrophoretic display apparatus 300 according to an embodiment of the present invention.
  • a light conversion layer 70 comprising V3) may be provided.
  • At least one of the lower substrate 310 and the upper substrate 320, for example, the upper substrate 320 on the observer side may be formed of a transparent material such as glass and a transparent resin.
  • Cavities V1, V2, and V3 may be defined by partition 300R, which is a separating member, as shown. However, this is exemplary and the cavities V1, V2, V3 may be defined by other separating members such as microcup structures or microcapsules as is well known in the art.
  • the cavities V1, V2, V3, alone or in combination with other adjacent one or more cavities, may constitute one sub-pixel or pixel.
  • the electrophoretic display device 300 may include electrodes 341; 342Y, 342M, and 342C for driving the electrophoretic particles 100K; 100Y, 100M, and 100C.
  • the electrodes 341 and 342 may have a configuration opposite to each other so as to generate an electric field perpendicular to the main surfaces of the substrates 310 and 320, as shown.
  • the electrodes 342Y, 342M, and 342C disposed on the lower substrate 310 may be individual electrodes that can be independently addressed for each pixel by a suitable switching element such as a transistor, and an electrode 341 on the upper substrate 320. ) May be a common electrode opposite the individual electrodes.
  • the above-described electrode configuration is exemplary and the present invention is not limited thereto.
  • the common electrode may be a transparent electrode formed of Indium-Tin-Oxide (ITO) or another transparent conductor.
  • ITO Indium-Tin-Oxide
  • Individual electrodes 342Y, 342M, 342C may be driven by an active matrix that includes transistors 350 as switching elements.
  • transistors 350 as switching elements.
  • the cavity V1, V2, V3 is filled with an electrically insulating fluid U, and at least one kind of particles 100Y, 100M, 100C, 100K having the aforementioned core structure is dispersed.
  • an effective surface area is extended by a plurality of magnetic particles externally charged on a charged mother particle, and a polymer dispersion layer is formed on the extended effective surface area, so that the bonding area of the polymer dispersion layer is increased. Is maximized.
  • the dispersion stability of the electrophoretic particles in the wet electrophoretic display pixel can be improved, and excellent display quality and bi-stability can be secured at room temperature as well as at high temperature.
  • the immersion density of the electrophoretic particles is reduced by the polymerization dispersion layer in the electrically insulating fluid, thereby increasing the electrical mobility, thereby obtaining an electrophoretic display device having improved driving speed.

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Abstract

La présente invention concerne des particules électrophorétiques et leur procédé de fabrication. Les particules électrophorétiques selon un mode de réalisation de la présente invention comprennent une structure de noyau comprenant une particule mère chargée et une pluralité de particules particules filles sur une surface de la particule mère ; et une couche de dispersion de polymérisation sur la structure de noyau.
PCT/KR2011/007925 2011-10-11 2011-10-24 Particules électrophorétiques et leur procédé de fabrication WO2013054969A1 (fr)

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KR1020110103788A KR101258464B1 (ko) 2011-10-11 2011-10-11 전기 영동 입자 및 이의 제조 방법
KR10-2011-0103788 2011-10-11

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WO2013054969A1 true WO2013054969A1 (fr) 2013-04-18

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20060123948A (ko) * 2005-05-30 2006-12-05 엘지전자 주식회사 건식형 전자종이의 화상 표시용 입자 및 이를 이용한 장치
KR100835396B1 (ko) * 2007-01-22 2008-06-09 한국과학기술연구원 금 나노 입자/고분자 미세 입자 복합체 및 이의 제조방법과 이를 함유하는 전기영동성 컬러 잉크 재료 및전기영동성 디스플레이 구조체
KR20110012739A (ko) * 2009-07-31 2011-02-09 주식회사 이미지앤머터리얼스 전기영동입자 및 이를 이용한 전기영동 디스플레이
JP2011043712A (ja) * 2009-08-21 2011-03-03 Fuji Xerox Co Ltd 電気泳動粒子、電気泳動粒子分散液、表示媒体、および表示装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20060123948A (ko) * 2005-05-30 2006-12-05 엘지전자 주식회사 건식형 전자종이의 화상 표시용 입자 및 이를 이용한 장치
KR100835396B1 (ko) * 2007-01-22 2008-06-09 한국과학기술연구원 금 나노 입자/고분자 미세 입자 복합체 및 이의 제조방법과 이를 함유하는 전기영동성 컬러 잉크 재료 및전기영동성 디스플레이 구조체
KR20110012739A (ko) * 2009-07-31 2011-02-09 주식회사 이미지앤머터리얼스 전기영동입자 및 이를 이용한 전기영동 디스플레이
JP2011043712A (ja) * 2009-08-21 2011-03-03 Fuji Xerox Co Ltd 電気泳動粒子、電気泳動粒子分散液、表示媒体、および表示装置

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KR20130039250A (ko) 2013-04-19

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