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WO2012030198A2 - Particules électrophorétiques, dispositif d'affichage multicolore et feuille d'image - Google Patents

Particules électrophorétiques, dispositif d'affichage multicolore et feuille d'image Download PDF

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Publication number
WO2012030198A2
WO2012030198A2 PCT/KR2011/006560 KR2011006560W WO2012030198A2 WO 2012030198 A2 WO2012030198 A2 WO 2012030198A2 KR 2011006560 W KR2011006560 W KR 2011006560W WO 2012030198 A2 WO2012030198 A2 WO 2012030198A2
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WIPO (PCT)
Prior art keywords
particles
color
electrophoretic particles
electrophoretic
light reflective
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English (en)
Korean (ko)
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WO2012030198A3 (fr
Inventor
조영태
이용의
김철환
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Image and Materials Inc
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Image and Materials Inc
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Publication of WO2012030198A2 publication Critical patent/WO2012030198A2/fr
Publication of WO2012030198A3 publication Critical patent/WO2012030198A3/fr
Anticipated expiration legal-status Critical
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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
    • G02F1/1679—Gaskets; Spacers; Sealing of cells; Filling or closing of cells
    • G02F1/1681—Gaskets; Spacers; Sealing of cells; Filling or closing of cells having two or more microcells partitioned by walls, e.g. of microcup 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
    • 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

Definitions

  • the present invention relates to display technology, and more particularly, to electrophoretic particles, electrophoretic display devices, and image sheets for multi-color displays.
  • An information display device for replacing a liquid crystal display device the display device using a technique such as electrophoresis, electro-chromic, dichroic particles rotary method, dry powder transfer method has been proposed. These techniques have been extensively studied as next generation display devices that can replace liquid crystal display devices due to advantages such as wide viewing angle, low power consumption, and memory effect in proximity to conventional print media such as paper.
  • an electrophoretic display device uses a phenomenon in which charged particles move by an electric field applied between two electrodes.
  • the electrophoretic display device implements a color subpixel by using a monochrome electrophoretic image sheet in which a color filter is combined or by using two or more kinds of color particles having different colors.
  • An object of the present invention is to provide electrophoretic particles capable of improving display quality such as color reproducibility and contrast of displayed information as color particles for electrophoretic display capable of multi-color implementation.
  • Another technical problem to be achieved by the present invention is to provide an image sheet using electrophoretic particles having the aforementioned advantages.
  • Another object of the present invention is to provide a multi-color electrophoretic display device using electrophoretic particles having the aforementioned advantages.
  • Electrophoretic particles for multi-color display according to an embodiment of the present invention for achieving the above technical problem is a light reflective sub-particles; And a color layer surrounding the light reflective subparticles.
  • the electrophoretic particles may have a size ranging from 0.05 ⁇ m to 2 ⁇ m.
  • the light reflective subparticles may have a size adjusted to achieve light shielding.
  • the light reflective subparticles may comprise a single particle core.
  • the single particle core may have a size of 0.01 ⁇ m to 1 ⁇ m.
  • the single particle core may have a size of 0.05 ⁇ m to 0.8 ⁇ m, and more preferably, the single particle core may have a size of 0.2 ⁇ m to 0.8 ⁇ m.
  • the light reflective sub-particle includes a plurality of reflective particles, wherein the size of the plurality of reflective particles is equal to the cross-sectional area S1 in the radial direction of the particle and the cross-sectional area S2 in the radial direction of the reflective particles.
  • the ratio S1 / S2 may be selected to be 2 or more and 100 or less.
  • the light reflective subparticles may include white inorganic particles.
  • the white inorganic particles include titanium oxide, antimony trioxide, zinc sulfide, zinc oxide, barium sulfate, barium titanium oxide, kaolin (kaolun), silicon oxide (silica), calcium oxide (calcium oxide), calcium carbonate (CaCO 3 ), or a mixed composition thereof may be included.
  • the light reflective subparticles may include metal particles.
  • the metallic particles may be any one or combination of silver nanoparticles, platinum nanoparticles, and aluminum nanoparticles.
  • the color layer comprises a composition comprising a binder resin and a dye having a predetermined color dispersed in the binder resin.
  • the said binder resin contains the reactive group which has affinity with respect to the surface of the said light reflective subparticle.
  • the reactive group may be an epoxy group, a thioepoxy group, a silanol group, a alkylamino group, an aziridin group, an oxazin group, an isocyanate group. ) Or a combination thereof.
  • concentration of the said dye with respect to the said binder resin is 1 weight% or more and 70 weight% or less.
  • the color layer may include a layer of dye material adsorbed to have physical, chemical, or both properties of the surface of the light reflective subparticles.
  • the light reflective subparticles may comprise light shielding pigment particles.
  • the color of the color layer and the pigment single particle may be the same.
  • a multi-color electrophoretic display device comprising: a plurality of cavities disposed between substrates facing each other; A dielectric fluid defined within the plurality of cavities; And electrophoretic particles having at least one of the foregoing features dispersed within the dielectric fluid.
  • the dielectric fluid may be transparent.
  • only the electrophoretic particles having any one color may be commonly dispersed in adjacent cavities of the plurality of cavities.
  • the color of the commonly dispersed electrophoretic particles may be green.
  • an image sheet includes: a plurality of cavities disposed between support substrates facing each other; A dielectric fluid defined within the plurality of cavities; And electrophoretic particles having at least one of the foregoing features dispersed within the dielectric fluid.
  • the dielectric fluid may be transparent.
  • Electrophoretic particles for multi-color display while improving the shielding power to the external light transmitted by the light reflective sub-particles to ensure excellent light reflectivity, to improve the color reproduction of the electrophoretic display device You can.
  • due to the excellent light shielding power it is possible to use a transparent dielectric fluid in the cavity, there is an advantage that can improve the contrast of the display information.
  • even if the total particles having a size of a few micro to submicron it is possible to increase the bistable stability while ensuring excellent electrophoretic mobility.
  • FIG. 1A and 1B are cross-sectional views showing the structure of electrophoretic particles for multi-color display according to embodiments of the present invention.
  • FIG. 2 is a cross-sectional view showing the structure of electrophoretic particles for multi-color display according to other embodiments of the present invention.
  • FIG. 3 is a cross-sectional view showing the structure of electrophoretic particles for multi-color display according to another embodiment of the present invention.
  • FIG. 4A is a cross-sectional view showing a multi-color display device using electrophoretic particles according to one embodiment of the present invention
  • FIG. 4B is a cross-sectional view showing an electrophoretic display device using dyed resin-based color particles as a comparative example. to be.
  • FIG. 5A is a cross-sectional view showing another electrophoretic display device using particles according to embodiments of the present invention
  • FIG. 5B is a cross-sectional view showing another electrophoretic display device using dyed resin-based color particles as a comparative example. .
  • 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. do. 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.
  • 1A and 1B are cross-sectional views showing the structure of the particles 100A and 100B for a multi-color electrophoretic display device according to embodiments of the present invention.
  • particle 100A includes a light reflective subparticle 101A and a color layer 102 surrounding the light reflective subparticle.
  • Particles 100A are generally spherical, but the present invention is not limited thereto.
  • the particles 100A may have various shapes such as elliptical or amorphous potato shapes. In the implementation of the actual display device, it was observed that the light shielding properties of the particles 100A are better when the particles 100A do not have a perfect sphere.
  • Particle 100A preferably has light reflectivity while increasing light shielding to ensure faithful color reproduction.
  • the size of the entire particles 100A is 0.02 ⁇ m to 10 ⁇ m, and preferably, 0.05 ⁇ m to 2 ⁇ m. Within this range, the particles have the advantage of increased bistableness and increased density of the particle layer collected on the electrode.
  • the overall size of particles 100A is thus several micrometers or submicron in dimension, the light shielding properties of particles 100A can have a significant impact on display quality, which will be described later.
  • the light reflective subparticle 101A may include single solid particles having a predetermined controlled size, as shown.
  • the single particle may have a size d1 of 0.01 ⁇ m to 1 ⁇ m, preferably, a size of 0.05 ⁇ m to 0.8 ⁇ m, and more preferably, a size d1 of 0.2 ⁇ m to 0.8 ⁇ m.
  • the light reflective subparticles 101 may be white inorganic particles.
  • the white inorganic particles include titanium oxide, antimony trioxide, zinc sulfide, zinc oxide, barium sulfate, barium titanium oxide, kaolin (kaolun), silicon oxide (silica), calcium oxide (calcium oxide), calcium carbonate (CaCO 3 ), or a combination thereof may be included.
  • the materials listed are exemplary and the present invention is not limited thereto.
  • the light reflective subparticles 101 may be metal particles.
  • the metallic particles may be, for example, silver nanoparticles, platinum nanoparticles, or aluminum nanoparticles.
  • the light reflective sub-particles may be composed of a plurality of particles 101B made of the reflective material described above as shown in FIG. 1B.
  • the size of the whole particles 100B is 0.02 ⁇ m to 10 ⁇ m, preferably 0.05 ⁇ m to 2 ⁇ m.
  • the size d3 of the plurality of particles 101B has a ratio S1 / S2 of the cross-sectional area S1 in the radial direction of the entire particle 100B and the cross-sectional area S2 in the radial direction of the reflective particles 101B. It may be selected to be more than 100. If the size of the plurality of particles 101B with respect to the size of the whole particle 100A is smaller than 100, the color reproduction power is reduced, which is understood to be because the shielding property is weakened.
  • the size of the plurality of particles 101B may be selected such that the ratio S1 / S2 is 2 or more and 50 or less, and more preferably, the ratio S1 / S2 is 2 or more and 10 or less.
  • the size of the plurality of particles 101B may be selected as such.
  • the size d3 of the plurality of particles 101B is densely packed in the entire particle 100B by having a predetermined particle size distribution within the above range, thereby securing the same level of light shielding as the single particle core 101A. can do.
  • the color layer 102 may be a composition including a binder resin and a dye having a predetermined color dispersed in the binder resin.
  • the binder resin is, for example, urethane resin (ureethane resin), urea resin (urea resin), acrylic resin (acrylic resin), polyester resin (polyester resin), acrylic urethane resin (acryl urethane resin), acrylic urethane silicone resin (acryl urethane silicone resin), acrylic urethane fluoro-carbon polymers, acrylic fluorocarbon polymers, silicone resins, acrylic silicone resins, polystyrene resins ( polystyrene resin, styrene acrylic resin, polyolefin resin, butyral resin, vinylylidene chloride resin, melamine resin, phenolic resin ( phenolic resins, fluorocarbon polymers, polycarbonate resins, polysulfon resins, polyether resins, poly May be a polymer resin material such as
  • the binder resin may be gelatin, alginic acid, latex polymer, polystyrene, polyvinyl formal, polyvinyl butyral, polymethyl acrylate, polybutyl acrylate, polymethyl. It may be formed in any one of methacrylate, polybutyl methacrylate or in combination with those described above.
  • the binder resin may have reactive groups having good affinity for the surfaces of the light reflective subparticles 101A, 101B.
  • reactive groups having good affinity for the surfaces of the light reflective subparticles 101A, 101B.
  • It may be a material containing a reactive group such as). These reactive groups can be applied independently or in combination.
  • the color layer 102 is colored to have the corresponding color by the dye dispersed in the binder resin.
  • the color of the color layer 102 may be any one of red, green, and blue, or one of magenta, cyan, and yellow.
  • the color of the color layer 102 may be black or white.
  • the color layer 102 may be formed of a composite layer including two or more layers. In this case, the composition of the binder resin constituting each layer and the color of the dye may be different.
  • the composite layer may provide particles having any one of red, green, and blue, or one of magenta, cyan, and yellow by mixing different colors.
  • the dye for forming the color layer 102 may be a compound with a suitable solvent.
  • Such dyes may be commercial acid dyes, oil-soluble dyes, disperse dyes, reactive dyes or direct dyes and the like.
  • the dye may be azo dyes, benzoquinone dyes, naphthoquinone dyes, anthraquinone dyes, cyanine dyes, or squary.
  • the pigment since the pigment itself has a particle diameter of about 0.05 ⁇ m to several ⁇ m, it may itself be a foreign matter in the binder resin, or the dispersion may not be stabilized and cause aggregation.
  • the particles 100A and 100B have a size of several micrometers to submicron, they are adsorbed and / or reacted with the binder resin instead of the pigment in order to obtain a uniform coating thickness d2 and excellent color uniformity over the entire surface. It is preferable to implement the color layer 102 by means of a dye.
  • An organic solvent in which the resin material and dye to be the color layer 102 is dissolved for example, acetone, methanol, ethanol, isopropylalcohol, and methoxymethylmethylpentanol pentanol, dipentene, ethyl amyl ketone, methyl nonyl ketone, methyl ethyl ketone, methyl isoamyl ketone, methyl isopropyl ketone (methyl isopropyl ketone), methyl cellosolve (methyl cellosolve), ethyl cellosolve (ethyl cellosolve), methyl cellosolve acetate (methyl cellosolve acetate), the optical semi-finished core particles (101A, 101B) is put into a, using a mixer By mixing, or by dyeing the binder resin layer on the photo-reflective core particles (101A, 101B) in a wet manner using a dry solvent such as thermocompression or a predetermined pH
  • the concentration of the dye with respect to the binder resin may be 1% by weight or more and 70% by weight or less. Preferably, it may be 3 to 40% by weight. When the concentration of the dye is less than 1% by weight, faithful color purity cannot be obtained. When the concentration of the dye is more than 70% by weight, the crystallinity of the dye molecules is not only high, but also precipitated to form the color layer 102 having a uniform thickness. Not.
  • the thickness of the color layer 102 may be appropriately selected in consideration of the sizes of the entire particles 100A and 100B.
  • the thickness d2 of the color layer 102 is several ⁇ m or less, preferably 0.05 ⁇ m to 2 ⁇ m or less.
  • the reflective subparticles 101A and 101B generally have a relatively large specific gravity compared to the dielectric solution (see U in FIG. 4A) described below in which the particles 100A and 1000B will be dispersed. If the specific gravity of the dielectric solution and the specific gravity of the particles (00A, 100B) is the same, since the particles are not affected by gravity in the dielectric solution (U), there is an advantage that the displayed information can be maintained even if the power is removed. . Thus, by adjusting the thickness d2 of the color layer 102, the particles 100A and 100B can be healed to have the same specific gravity as the dielectric solution U.
  • particles 100A, 100B may further include at least one or more additives, such as charge control agents, additives to improve fluidity, photoinitiators and photoamplifiers in or on color layer 102.
  • additives such as charge control agents, additives to improve fluidity, photoinitiators and photoamplifiers in or on color layer 102.
  • These additives may be dispersed in the color layer 102 or copolymerized with a binder resin material, and may have a configuration that is adsorbed or chemically bonded on the surface of the color layer 102.
  • the charge control agent may include, for example, a negative or positive charge control agent.
  • Negative charge control agents are, for example, salicylic acid metal complexes, metal containing azo dyes, oil-soluble dyes of metal-containing, quaternary ammonium
  • the fourth grade ammonium salt-based compound, calixarene compound, boron-containing compound (e.g., benzyl acid boron complex), and nitroimi It may be a nitroimidazole derivative.
  • 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 charge of the particles 100a, 100b may be provided by charging between particles having different kinds of binder resin layers.
  • Tween-based, SPAN-based dispersant, polyisobutylene succimide (PIBSI) series, ((M9 8ZS, Manchester, UK, obtained from Noveon Division Lubrizol Limited of Blakeley Hexagon House) Possible) Solsperse series products may be used
  • PIBSI polyisobutylene succimide
  • Solsperse series products may be used
  • the photoinitiator and the optical amplification agent may be known according to the binder resin used, but the present invention is not limited thereto.
  • an additional protective layer made of, for example, a polymer may be further formed at the outermost part of the particles 100A, 100B to protect the particles from externally applied mechanical, photochemical and / or electrical stresses. have.
  • FIG. 2 is a cross-sectional view showing the structure of the particles 200 for a multi-color electrophoretic display device according to other embodiments of the present invention.
  • the particle 200 similar to the particle 100 described with reference to FIG. 1A, has a color layer 202 surrounding the light reflective subparticle 201 and the light reflective subparticle 201. Include.
  • the color layer 202 may be a layer of dye material 202 physically and / or chemically adsorbed to the surface of the light reflective subparticle 201, unlike the color layer 102 disclosed in FIG. 1A.
  • the size of the whole particles 200 is 0.02 ⁇ m to 10 ⁇ m, preferably, 0.05 ⁇ m to 2 ⁇ m.
  • the light reflective subparticle 201 may be a single particle, and the single particle may have a size d1 of 0.01 ⁇ m to 1 ⁇ m.
  • the single particle may have a size d1 of 0.05 ⁇ m to 0.8 ⁇ m, and more preferably, may have a size d1 of 0.2 ⁇ m to 0.8 ⁇ m.
  • the light reflective subparticle 201 may comprise a plurality of particles of light reflective material (see 101B in FIG. 1B).
  • the size (d3) of the plurality of particles is a ratio (S1 / S2) of the cross-sectional area (S1) in the radial direction of the entire particle 200 and the cross-sectional area (S2) in the radial direction of the plurality of particles is 2 or more 100 It may be selected to be as follows. In fact, if the size of the plurality of particles is smaller than 100, the shielding is weakened and color reproduction power is reduced.
  • the size of the plurality of particles may be selected such that the ratio S1 / S2 is 2 or more and 50 or less, and more preferably, the plurality of particles such that the ratio S1 / S2 is 2 or more and 10 or less.
  • the size of the particles of can be chosen.
  • the plurality of particles are densely packed in the whole particle 200 within the above range, thereby obtaining the same level of light shielding as the single particle core.
  • the light reflective subparticles 201 are immersed in a solution in which the dye material is dispersed for a few minutes to several hours, so that the dye material is light reflective. It adsorbs on the surface of the sub particle 201.
  • a solvent for dispersing the dye material acetonitrile, dichloromethane or an alcohol solvent may be used.
  • the particle 200 can then be prepared by removing the unadsorbed dye material from the surface of the light reflective subparticles 201 using a suitable cleaning solution.
  • the color layer 202 made of the dye material adsorbed to the light reflective subparticle 201 may have red, green or blue color, or may have magenta, cyan or yellow color. Alternatively, the color layer 202 may have black or white.
  • the color layer 202 is a composite layer composed of two or more dye material layers, the colors of each dye material layer may be different from each other, and may be red, green, blue or magenta, cyan, yellow by mixing different colors. It is also possible to provide particles having a color of. With regard to suitable dye materials, reference may be made to the dye materials described above.
  • the thickness of the color layer 201 may be several ⁇ m or less, and may be appropriately selected in consideration of the sizes of the whole particles 100A and 100B, preferably 0.05 ⁇ m to 2 ⁇ m or less. In addition, the thickness of the color layer 201 may preferably be selected such that the particles 200 have a specific gravity substantially the same as the dielectric solution U.
  • color layer 102 composed of a colored layer 201 made of the adsorbed dye material disclosed with reference to FIG. 2 and a binder resin layer colored by the dye described above with reference to FIGS. 1A and 1B. It will be appreciated that color layers of this combined multilayer structure are also included in the embodiments of the present invention.
  • FIG 3 is a cross-sectional view showing the structure of a particle 300 for a multi-color electrophoretic display device according to another embodiment of the present invention.
  • the particle 300 includes a light shielding pigment particle 301 having a first color at its center and a color layer 302 having a second color surrounding the light shielding pigment particle 301.
  • Particle 300 may have a spherical distribution in the range of 100% to 140% shape coefficient, in order to ensure excellent electrophoretic mobility, the size of the entire particle 300 is several ⁇ m or less, to ensure the appropriate mobility In order to achieve this, the size of the whole particles 300 is 0.02 ⁇ m to 10 ⁇ m, and preferably, 0.05 ⁇ m to 2 ⁇ m. In the particles within this range, as compared with particles of several tens to hundreds of micrometers in size, the pair-safety is improved, and the packing state of the particle layer collected on any one electrode can be improved.
  • the light shielding pigment particle 301 may be a pigment single particle adjusted to a predetermined size to have a light shielding property.
  • the pigment single particle may have a size (d1) of 0.01 ⁇ m to 1 ⁇ m, preferably, has a size (d1) of 0.05 ⁇ m to 0.8 ⁇ m, and more preferably, a size of 0.2 ⁇ m to 0.8 ⁇ m may have (d1). In the above-described range, light reflectance of 90% or more and particle mobility of 85% to 95% were obtained.
  • the light shielding pigment particles 301 may comprise a plurality of pigment particles similar to the particle structure 100B of FIG. 1B.
  • the size (d1) of the plurality of pigment particles is a ratio (S1 / S2) of the cross-sectional area (S1) in the radial direction of the whole particle 300 and the cross-sectional area (S2) in the radial direction of the plurality of pigment particles is 2 It may be selected to be more than 100.
  • the size of the plurality of pigment particles 301 may be selected such that the ratio S1 / S2 is 2 or more and 50 or less, and more preferably, the ratio S1 / S2 is 2 or more and 10 or less.
  • the size of the plurality of pigment particles 301 may be selected as such.
  • the size d1 of the plurality of pigment particles 301 may have a suitable particle size distribution within the above range, and is densely packed within the whole particle 300.
  • the thickness d2 of the color layer 302 may be selected in consideration of the size of the entire particle 300.
  • the thickness of the color layer 302 is chosen such that the total specific gravity of the particles 300 has the same specific gravity as the dielectric solution U.
  • the color layer 302 surrounding the light shielding pigment particles 301 may be made of a mixed composition of a suitable binder resin and a dye having that color, as described above with reference to FIGS. 1A and 1B.
  • the color layer 302 may comprise a layer of dye material that is physically and / or chemically adsorbed to the surface of the light shielding pigment particle 302, as described above with reference to FIG. 2.
  • this is exemplary and the present invention is not limited thereto.
  • the color layer 302 may be formed in a multi-layered structure including a color layer 202 made of the adsorbed dye material of FIG. 2 and a color layer 102 colored by the dye of FIG. 1.
  • the color of the light shielding pigment particles 301 and the color of the color layer 302 may be the same.
  • the color of the light shielding pigment particle 301 and the color layer 302 may be either red, green, or blue, or may be either magenta, cyan, or yellow.
  • the color of the light shielding pigment particle 301 and the color layer 302 may be black or white.
  • the same color means not only having completely the same color coordinates, but also clearly including a concept having color coordinates of approximately the same degree.
  • the colors of the light shielding pigment particles 301 and the color layer 302 may be different.
  • one of red, green, and blue colors, or one of magenta, cyan, and yellow colors may be implemented by mixing different colors.
  • FIG. 4A is a cross-sectional view illustrating an electrophoretic display apparatus 1000 using particles 100R, 100G, and 100B according to one embodiment of the present invention, and FIG. 4B illustrates conventional particles PR, It is sectional drawing which shows the electrophoretic display apparatus 1000R using PG and PB.
  • the electrophoretic display apparatuses 1000 and 1000R may include a first substrate 10 (which may be a lower substrate in this drawing) and a second substrate 20 facing the lower substrate 10. In the figure, which may be an upper substrate). In one embodiment, at least one of the lower substrate 10 and the upper substrate 20 may be formed of a transparent material. Optionally, the substrates 10 and 20 are formed of a resin-based material, which is lightweight and may be flexible.
  • a plurality of partition walls 30, which are separation members, may be disposed between the substrates 10 and 20, a plurality of partition walls 30, which are separation members, may be disposed.
  • the space between the substrates 10 and 20 by the plurality of partition walls 30 is divided in a direction parallel to the main surfaces of the substrates 10 and 20, and the cavity V1 and V2 are divided by the divided small spaces. , V3) can be defined.
  • Each cavity may be alone or in combination with other adjacent one or more cavities to constitute one subpixel or pixel.
  • the partition structure defining these cavities V1, V2, V3 is exemplary, and embodiments of the present invention are not limited thereto.
  • the cavities V1, V2, V3 may also be defined by known microcapsule or microcup structures.
  • the electrophoretic display apparatuses 1000 and 1000R include driving electrodes 41 and 42.
  • the illustrated electrodes 41, 42 have configurations that oppose each other so as to generate an electric field perpendicular to the major surfaces of the substrates 10, 20, but this is merely illustrative, and the electrodes are known in-plane configurations or they It may have a combined configuration.
  • the electrodes 42 disposed on the lower substrate 10 may include individual electrodes 42R, 42G, and 42B for each cell.
  • the electrode 41 on the upper substrate 20 is a common electrode opposite the individual electrodes 42.
  • the transparent electrode may include, for example, Indium-Tin-Oxide (ITO), Fluorinated Tin Oxide (FTO), Indium Oxide (IO), and Tin Oxide; It may be formed of any one or a combination of a transparent metal oxide such as SnO 2 ), a transparent conductive resin such as polyacetylene, or a conductive resin containing conductive metal fine particles.
  • ITO Indium-Tin-Oxide
  • FTO Fluorinated Tin Oxide
  • IO Indium Oxide
  • Tin Oxide Tin Oxide
  • It may be formed of any one or a combination of a transparent metal oxide such as SnO 2 ), a transparent conductive resin such as polyacetylene, or a conductive resin containing conductive metal fine particles.
  • Each individual electrode 42 may be driven by a suitable switch element, for example MOS thin film transistor 50.
  • the MOS thin film transistors 50 may be disposed on the lower substrate 10, for example, in an array of a plurality of rows by a plurality of columns.
  • the active matrix by the MOS thin film transistors 50 for driving the individual electrodes 42 is disclosed, but this is only illustrative, and those skilled in the art will realize a passive matrix type electrode configuration, or static driving. It will be appreciated that the segmented electrode configuration is also included in the embodiment of the present invention.
  • a plurality of cavities (V1, V2, V3) inside the dielectric solution (U) and at least one or more electrophoretic particles (100R, 100G, 100B, 100K; PR, PG, PB, PK) is dispersed.
  • electrophoretic particles 100R, 100G, 100B, 100K; PR, PG, PB, PK
  • this is exemplary and may be filled with one kind of particles or three or more kinds of particles in the cavities V1, V2, V3.
  • the plurality of cells V1, V2, and V3 may be closed by the sealing layer 80.
  • Particles 100R, 100G, 100B, 100K (PR, PG, PB, PK) dispersed in cavities V1, V2, V3 have a color corresponding to the pixel or subpixel to be implemented.
  • particles 100R, 100G, 100B, 100K; PR, PG, PB, and PK of the first to third cavities V1, V2, and V3 may be used to realize multi-color by the RGB color system. Silver may comprise red, green and blue particles, respectively.
  • the multi color may be implemented by the CMY color system.
  • the particles 100R, 100G, 100B; PR, PG, and PB of the first to third cavities V1, V2, and V3 may be cyan, respectively. It may also comprise magenta and yellow particles.
  • black or white particles 100K (PK) may be further included in each pixel.
  • the dielectric solution U is a fluid having high resistance and low viscosity.
  • the dielectric solution U is a single fluid or a mixture of two or more fluids.
  • the specific gravity of the dielectric solution U may be prepared to be substantially the same as the specific gravity of the particles 100R, 100G, 100B, and 100K dispersed in the dielectric solution U.
  • a variety of charge-controlling agents, cationic or anionic surfactants, metal soaps, resin materials, metal-based coupling agents and stabilizing agents Functional additives may be added.
  • dielectric solutions are colored by dyes or pigments to prevent the color of the particles that should not be visible from the viewer, as described below, on the viewer side.
  • the dielectric solution is colored to have a gray color to suppress the immersion of the particles.
  • contrast may be reduced when implementing a two-color display of black and white.
  • the dielectric solution colored in gray becomes a factor of reducing color gamut. Therefore, the dielectric solution is preferably transparent or colorless. The inventors have found that using a transparent dielectric solution without the immersion of these particles can be achieved through the improvement of the particles according to embodiments of the present invention. From the following description, the advantages of the particles according to the embodiments of the invention disclosed with reference to FIGS. 1A to 3 will become apparent.
  • FIG. 4A and 4B show a state in which dispersed particles are distributed so as to express predetermined information by a signal applied to each cell.
  • particles 100R, 100G, 100B, 100K according to one embodiment of the invention, for example, the particles disclosed with reference to FIGS. 1 to 3, for example, light reflective Particles comprising the subparticle and the colored layer with the controlled thickness are dispersed.
  • FIG. 4B is a comparative example of the embodiments of the present invention.
  • the dye-based color particles PR, PG, PB, and PK that is, dyes are dispersed in a predetermined color. Particles with colored colored polymer bodies or polymer matrices are dispersed.
  • the color particles 100R, 100G, 100B PR, PG, PB
  • PR, PG, PB black particles 100K
  • PK black particles 100K
  • a predetermined electric field may be applied between the pixel electrodes 42R, 42G, and 42B and the common electrode 41.
  • a negative potential is applied to the pixel electrode 42R of the first subpixel V1 and a positive potential is applied to the pixel electrodes 42G and 42B of the second and third subpixels V2 and V3.
  • a potential is applied, and a ground potential may be applied to the common electrode 41.
  • the particles 100R, 100G, 100B, 100K; PR, PG, PB, PK will be distributed as shown.
  • the incident light i is reflected by the particles 100R, 100G (PR, PG) and has a wavelength of red and green color to the viewer 1, respectively. Light is transmitted.
  • the third subpixel V3 all incident light i is absorbed and turned off by the black particles 100K and PK, and no light is transmitted to the observer 1.
  • the observer 1 observes the color in which the red light (iR; iR ') and the green light (iG; iG') which are reflected light are mixed.
  • the light reflectivity of the particles is increased by the reflective sub-particles, thereby improving the color reproducibility of the reflected light by the color layer.
  • the particles have excellent light shielding power by the reflective sub-particles and the color layer having a controlled size.
  • the black particles 100K which should be hidden by the color particles 100R and 100G and should not be visible to the viewer 1, are not reflected to the viewer 1. Therefore, by using the particles according to the embodiment of the present invention, the non-impregnation phenomenon can be suppressed even when the dielectric solution (U) is not colored, thereby improving contrast as well as color reproduction.
  • FIG. 5A is a cross-sectional view showing another electrophoretic display apparatus 2000 using particles 100R, 100G, and 100B according to embodiments of the present invention
  • FIG. 5B is a dye-based resin particle (PR) as a comparative example.
  • PR dye-based resin particle
  • constituent members having the same reference numerals as the constituent members of FIGS. 4A and 4B.
  • particles having a predetermined color may be commonly dispersed in adjacent subpixels.
  • red and green particles 100R and 100G are dispersed together in the first subpixel V1, and blue and green particles (in the adjacent second subpixel V2).
  • red and green particles 100R and 100G are dispersed together in the first subpixel V1, and blue and green particles (in the adjacent second subpixel V2).
  • red and green particles 100R and 100G are dispersed together in the first subpixel V1
  • blue and green particles in the adjacent second subpixel V2
  • dispersing 100B and 100G together only green particles may be commonly dispersed in adjacent subpixels V1 and V2. Since the human eye is sensitive to green, by dispersing the green particles 100G in different cells in common, it is possible to increase the display area of the green particles compared to other colors.
  • the area required to form green pixels separately is reduced, thereby increasing the number of pixels under the same display area, thereby improving the resolution.
  • the magenta and cyan particles may be dispersed in the first subpixel V1 and the yellow and cyan particles may be dispersed in the second subpixel V2, in which case the cyan particles may be dispersed.
  • the device 2000 may further include a subpixel comprising additional black or white particles adjacent to the subpixels V1, v2.
  • additional black or white particles can be selectively dispersed within each cell V1, V2 or selectively for only one cell.
  • red and blue particles 100R and 100B PR and PB
  • the green particles 100G PG
  • a potential is applied to individual electrodes, and each color particle may be distributed as shown in FIGS. 5A and 5B.
  • the image media layer includes a support substrate to be an upper substrate, which is a carrier substrate, and subpixels formed of the aforementioned capsules, microcups, cavities, partitions, and the like formed on the support substrate, and within the subpixels, a dielectric fluid. And the aforementioned particles dispersed therein.
  • the electrophoretic display apparatus 1000 as shown in FIG. 4A may be provided, for example, by bonding to the lower substrate 10 on which the driving element 50 is formed using an adhesive layer. have.

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Abstract

La présente invention se rapporte à des particules électrophorétiques destinées à un affichage multicolore, ainsi qu'à une feuille d'image et à un dispositif d'affichage électrophorétique qui comprennent celles-ci. Selon un mode de réalisation de la présente invention, les particules électrophorétiques destinées à un affichage multicolore comprennent : des particules secondaires qui réfléchissent la lumière et une couche de couleur qui entoure lesdites particules secondaires qui réfléchissent la lumière.
PCT/KR2011/006560 2010-09-03 2011-09-05 Particules électrophorétiques, dispositif d'affichage multicolore et feuille d'image Ceased WO2012030198A2 (fr)

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KR10-2010-0086456 2010-09-03
KR1020100086456A KR20120023389A (ko) 2010-09-03 2010-09-03 전기 영동 입자들, 멀티 컬러 디스플레이 장치 및 이미지 시트

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CN113249959A (zh) * 2021-06-18 2021-08-13 上海贝域实业有限公司 纳米黑丝物理遮光窗帘及其制备方法

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KR20130110470A (ko) * 2012-03-29 2013-10-10 코오롱인더스트리 주식회사 전기 영동 입자, 전기 영동 입자의 제조 방법, 전기 영동 슬러리 조성물 및 이를 포함하는 전기 영동 디스플레이 장치
KR102116283B1 (ko) * 2014-03-04 2020-05-29 삼성전자주식회사 디스플레이 장치 및 그 제조 방법
KR102172248B1 (ko) * 2018-01-10 2020-10-30 세종대학교산학협력단 무기 하이브리드 광결정 필름 및 이의 제조 방법

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JP2006518483A (ja) * 2003-02-21 2006-08-10 キヤノン株式会社 電気泳動表示装置
KR101172449B1 (ko) * 2005-02-15 2012-08-07 엘지전자 주식회사 전자 종이 표시 장치용 입자 및 그 제조 방법
KR100872135B1 (ko) * 2007-04-18 2008-12-08 한국생산기술연구원 유동성 입자 및 이를 포함하는 충돌 대전형 전자 종이 표시장치
KR100862664B1 (ko) * 2007-07-25 2008-10-10 삼성전자주식회사 셀형 전기 영동 입자 및 이를 적용한 디스플레이 소자

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CN113249959A (zh) * 2021-06-18 2021-08-13 上海贝域实业有限公司 纳米黑丝物理遮光窗帘及其制备方法

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