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US20020113770A1 - Methods for achieving improved color in microencapsulated electrophoretic devices - Google Patents

Methods for achieving improved color in microencapsulated electrophoretic devices Download PDF

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Publication number
US20020113770A1
US20020113770A1 US09/349,806 US34980699A US2002113770A1 US 20020113770 A1 US20020113770 A1 US 20020113770A1 US 34980699 A US34980699 A US 34980699A US 2002113770 A1 US2002113770 A1 US 2002113770A1
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United States
Prior art keywords
display elements
particles
electrode
species
electrophoretic display
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
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US09/349,806
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English (en)
Inventor
Joseph M. Jacobson
Ian D. Morrison
Russell J. Wilcox
Paul Drzaic
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E Ink Corp
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E Ink Corp
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Priority to US09/349,806 priority Critical patent/US20020113770A1/en
Assigned to E INK reassignment E INK ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DRZAIC, PAUL, WILCOX, RUSSELL J., JACOBSON, JOSEPH M., MORRISON, IAN D.
Assigned to E INK reassignment E INK ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DRZAIC, PAUL, WILCOX, RUSSELL J., JACOBSON, JOSEPH M., MORRISON, IAN D.
Publication of US20020113770A1 publication Critical patent/US20020113770A1/en
Priority to US10/817,464 priority patent/US7667684B2/en
Priority to US12/609,158 priority patent/US9293511B2/en
Priority to US12/609,149 priority patent/US20100156780A1/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
    • B41J3/4073—Printing on three-dimensional objects not being in sheet or web form, e.g. spherical or cubic objects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/21—Ink jet for multi-colour printing
    • B41J2/2107—Ink jet for multi-colour printing characterised by the ink properties
    • B41J2/2114—Ejecting specialized liquids, e.g. transparent or processing liquids
    • B41J2/2117—Ejecting white liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
    • B41J3/4076—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material printing on rewritable, bistable "electronic paper" by a focused electric or magnetic field
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/02—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the intensity of light
    • G02B26/026—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the intensity of light based on the rotation of particles under the influence of an external field, e.g. gyricons, twisting ball displays
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/302—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements characterised by the form or geometrical disposition of the individual elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/37—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being movable elements
    • G09F9/372—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being movable elements the positions of the elements being controlled by the application of an electric field
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K19/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic element specially adapted for rectifying, amplifying, oscillating or switching, covered by group H10K10/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
    • 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 
    • G02F1/13—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 liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133305—Flexible substrates, e.g. plastics, organic film
    • 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 
    • G02F1/13—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 liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1334—Constructional arrangements; Manufacturing methods based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
    • 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
    • G02F1/16757—Microcapsules
    • 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
    • G02F2202/28—Adhesive materials or arrangements
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K10/00—Organic devices specially adapted for rectifying, amplifying, oscillating or switching; Organic capacitors or resistors having potential barriers
    • H10K10/40—Organic transistors
    • H10K10/46—Field-effect transistors, e.g. organic thin-film transistors [OTFT]
    • H10K10/462—Insulated gate field-effect transistors [IGFETs]
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/30—Coordination compounds
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60—Organic compounds having low molecular weight

Definitions

  • the present invention relates to electronic displays and, in particular, to full color electrophoretic displays and methods of manufacturing full-color microencapsulated electrophoretic displays.
  • Electrophoretic display media are generally characterized by the movement of particles through an applied electric field. These displays are highly reflective, can be made bistable, can be scaled to large areas, and consume very little power. These properties allow encapsulated electrophoretic display media to be used in many applications for which traditional electronic displays are not suitable. While bichromatic electrophoretic displays have been demonstrated in a limited range of colors (e.g. black/white or yellow/red), to date there has not been successful commercialization of a full-color electrophoretic display. One reason for this failure of commercialization is the lack of a method of manufacture that is efficient and inexpensive.
  • emissive displays One traditional technique for achieving a bright, full-color display which is known in the art of emissive displays is to create display elements that are red, green and blue. In this system, each element has two states: on, or the emission of color; and off. Since light blends from these elements, the overall display can take on a variety of colors and color combinations.
  • the visual result is the summation of the wavelengths emitted by the display elements at selected intensities, white is seen when red, green and blue are all active in balanced proportion.
  • the brightness of the white image is controlled by the intensities of emission of light by the individual display elements. Black is seen when none are active or, equivalently, when all are emitting at zero intensity.
  • a red visual display appears when the red display element is active while the green and blue are inactive, and thus only red light is emitted.
  • This method can be applied to bichromatic reflective displays, typically using the cyan-magenta-yellow subtractive color system.
  • the reflective display elements absorb characteristic portions of the optical spectrum, rather than generating characteristic portions of the spectrum as do the elements in an emissive display.
  • White reflects everything, or equivalently absorbs nothing.
  • a colored reflective material reflects light corresponding in wavelength to the color seen, and absorbs the remainder of the wavelengths in the visible spectrum. To achieve a black display, all three display elements are turned on, and they absorb complementary portions of the spectrum.
  • This invention teaches practical ways to efficiently and cheaply manufacture full-color, encapsulated electrophoretic displays.
  • the display media can be printed and, therefore the display itself can be made inexpensively.
  • An encapsulated electrophoretic display can be constructed so that the optical state of the display is stable for some length of time.
  • the display When the display has two states which are stable in this manner, the display is said to be bistable. If more than two states of the display are stable, then the display can be said to be multistable.
  • bistable and multistable, or generally, stable will be used to indicate a display in which any optical state remains fixed once the addressing voltage is removed.
  • the definition of a stable state depends on the application for the display.
  • a slowly-decaying optical state can be effectively stable if the optical state is substantially unchanged over the required viewing time.
  • bistable and multistable also indicate a display with an optical state sufficiently long-lived as to be effectively stable for the application in mind.
  • encapsulated electrophoretic displays in which the image decays quickly once the addressing voltage to the display is removed (i.e., the display is not bistable or multistable).
  • an encapsulated electrophoretic display which is not bistable or multistable. Whether or not an encapsulated electrophoretic display is stable, and its degree of stability, can be controlled through appropriate chemical modification of the electrophoretic particles, the suspending fluid, the capsule, binder materials, or addressing methods.
  • An encapsulated electrophoretic display may take many forms.
  • the display may comprise capsules dispersed in a binder.
  • the capsules may be of any size or shape.
  • the capsules may, for example, be spherical and may have diameters in the millimeter range or the micron range, but is preferably from ten to a few hundred microns.
  • the capsules may be formed by an encapsulation technique, as described below.
  • Particles may be encapsulated in the capsules.
  • the particles may be two or more different types of particles.
  • the particles may be colored, luminescent, light-absorbing or transparent, for example.
  • the particles may include neat pigments, dyed (laked) pigments or pigment/polymer composites, for example.
  • the display may further comprise a suspending fluid in which the particles are dispersed.
  • an encapsulated electrophoretic display requires the proper interaction of several different types of materials and processes, such as a polymeric binder and, optionally, a capsule membrane. These materials must be chemically compatible with the electrophoretic particles and fluid, as well as with each other. The capsule materials may engage in useful surface interactions with the electrophoretic particles, or may act as a chemical or physical boundary between the fluid and the binder.
  • materials and combinations of materials useful in constructing encapsulated electrophoretic displays are described in co-pending application Ser. No. 09/140,861, the contents of which are incorporated by reference herein.
  • the encapsulation step of the process is not necessary, and the electrophoretic fluid may be directly dispersed or emulsified into the binder (or a precursor to the binder materials) and an effective “polymer-dispersed electrophoretic display” constructed.
  • the binder or a precursor to the binder materials
  • an effective “polymer-dispersed electrophoretic display” constructed.
  • voids created in the binder may be referred to as capsules or microcapsules even though no capsule membrane is present.
  • the binder dispersed electrophoretic display may be of the emulsion or phase separation type.
  • printing is intended to include all forms of printing and coating, including: premetered coatings such as patch die coating, slot or extrusion coating, slide or cascade coating, and curtain coating; roll coating such as knife over roll coating, forward and reverse roll coating; gravure coating; dip coating; spray coating; meniscus coating; spin coating; brush coating; air knife coating; silk screen printing processes; electrostatic printing processes; thermal printing processes; lithographic printing processes; ink-jet printing processes and other similar techniques.
  • premetered coatings such as patch die coating, slot or extrusion coating, slide or cascade coating, and curtain coating
  • roll coating such as knife over roll coating, forward and reverse roll coating
  • gravure coating dip coating
  • spray coating meniscus coating
  • spin coating spin coating
  • brush coating air knife coating
  • silk screen printing processes electrostatic printing processes
  • thermal printing processes lithographic printing processes
  • ink-jet printing processes and other similar techniques A “printed element” refers to an element formed using any one of the above techniques.
  • electrophoretic display elements can be encapsulated. Throughout the Specification, reference will be made to “capsules,” “elements,” and “display elements.” A capsule or display element may itself comprise one or more capsules or other structures.
  • the present invention relates to a method for manufacturing a color electrophoretic display.
  • a substrate is provided having at least two electrodes.
  • a first plurality of electrophoretic display elements are disposed on the substrate in substantial registration with one of the electrodes.
  • the first plurality of electrophoretic display elements includes capsules containing a first species of particles suspended in a dispersing fluid and having a first optical property.
  • a second plurality of electrophoretic display elements is disposed on the substrate in substantial registration with the other electrode.
  • the second plurality of electrophoretic display elements includes capsules containing a second species of particles suspended in a dispersing fluid and having a second optical property.
  • the present invention relates to a method for manufacturing a color electrophoretic display.
  • a substrate is provided.
  • a first plurality of electrophoretic display elements are disposed on the substrate.
  • the first plurality of electrophoretic display elements includes capsules containing a first species of particles suspended in a dispersing fluid and having a first optical property.
  • At least one electrode is deposited on the first plurality of electrophoretic display elements.
  • the present invention relates to a method for manufacturing a color electrophoretic display.
  • a substrate is provided and at least two electrodes are deposited on the substrate.
  • a first plurality of electrophoretic display elements are disposed on the substrate in substantial registration with one of the electrodes.
  • the first plurality of electrophoretic display elements includes capsules containing a first species of particles suspended in a dispersing fluid and having a first optical property.
  • a second plurality of electrophoretic display elements is disposed on the substrate in substantial registration with the other electrode.
  • the second plurality of electrophoretic display elements includes capsules containing a second species of particles suspended in a dispersing fluid and having a second optical property.
  • the present invention relates to a method for manufacturing a color electrophoretic display.
  • a substrate is provided and a first plurality of electrophoretic display elements are disposed on the substrate.
  • the first plurality of electrophoretic display elements includes capsules containing a first species of particles suspended in a dispersing fluid and having a first optical property.
  • a second substrate is provided and at least one electrode is deposited on the second substrate. The first and second substrate are disposed adjacent each other so that the display elements are adjacent the electrode.
  • FIG. 1A is a diagrammatic side view of an embodiment of a rear-addressing electrode structure for a particle-based display in which a smaller electrode has been placed at a voltage relative to the large electrode causing the particles to migrate to the smaller electrode.
  • FIG. 1B is a diagrammatic side view of an embodiment of a rear-addressing electrode structure for a particle-based display in which the larger electrode has been placed at a voltage relative to the smaller electrode causing the particles to migrate to the larger electrode.
  • FIG. 1C is a diagrammatic top-down view of one embodiment of a rear-addressing electrode structure.
  • FIG. 1D is a diagrammatic side view of one embodiment of a display having three display elements, each display element being produced by a printing process.
  • FIG. 1E is a diagrammatic plan view of one embodiment of a display having three display elements, each display element being produced by a printing process.
  • FIG. 2 is a cross-sectional view of a rear electrode addressing structure that is formed by printing.
  • FIG. 3A is a schematic flow diagram of selected steps in a method of manufacturing a display that employs a process in which electrodes are first printed on a substrate, followed by the printing of display elements upon the electrodes.
  • FIG. 3B is a schematic flow diagram of selected steps in a method of manufacturing a display that employs a process in which display elements are first printed on a substrate, followed by the printing of electrodes upon the display elements.
  • FIG. 3C is a schematic flow diagram of selected steps in a method of manufacturing a display that employs a process in which electrodes are printed on a first substrate, display elements are printed on a second substrate, and the two structures are combined to form a display.
  • FIG. 3D is a diagrammatic side view of an embodiment of an addressing structure having transparent electrodes, in which an alternating-current electric field has been applied to the capsule causing the particles to disperse into the capsule.
  • FIG. 3E is a diagrammatic side view of an embodiment of an addressing structure for a display element having three sub-pixels.
  • FIG. 3F is a diagrammatic side view of an embodiment of a dual particle curtain mode addressing structure addressing a display element to appear white.
  • FIG. 3G is a diagrammatic side view of an embodiment of a dual particle curtain mode addressing structure addressing a display element to appear red.
  • FIG. 3H is a diagrammatic side view of an embodiment of a dual particle curtain mode addressing structure addressing a display element to absorb red light.
  • FIG. 3I is a diagrammatic side view of an embodiment of a dual particle curtain mode addressing structure for a display element having three sub-pixels, in which the display is addressed to appear red.
  • FIG. 3J is a diagrammatic side view of another embodiment of a dual particle curtain mode addressing structure for a display element.
  • FIG. 3K is a diagrammatic plan view of an embodiment of an interdigitated electrode structure.
  • FIG. 3L is a diagrammatic side view of another embodiment of a dual particle curtain mode display structure having a dyed fluid and two species of particles, addressed to absorb red.
  • FIG. 3M is a diagrammatic side view of another embodiment of a dual particle curtain mode display structure having clear fluid and three species of particles, addressed to absorb red.
  • FIG. 4A depicts an embodiment of a manufacturing process that employs a drum for printing electrodes or display elements.
  • FIG. 4B depicts an embodiment of a manufacturing process that employs an inkjet for printing electrodes or display elements.
  • FIG. 4C depicts an embodiment of a manufacturing process that employs a flat platen for printing electrodes or display elements.
  • FIG. 5 is a flowchart showing the steps to be taken to fabricate a display using a method of the present invention.
  • Electronic ink is an optoelectronically active material that comprises at least two phases: an electrophoretic contrast media phase and a coating/binding phase.
  • the electrophoretic phase comprises, in some embodiments, a single species of electrophoretic particles dispersed in a clear or dyed medium, or more than one species of electrophoretic particles having distinct physical and electrical characteristics dispersed in a clear or dyed medium.
  • the electrophoretic phase is encapsulated, that is, there is a capsule wall phase between the two phases.
  • the coating/binding phase includes, in one embodiment, a polymer matrix that surrounds the electrophoretic phase.
  • the polymer in the polymeric binder is capable of being dried, crosslinked, or otherwise cured as in traditional inks, and therefore a printing process can be used to deposit the electronic ink onto a substrate.
  • the ink may comprise display elements capable of displaying different colors.
  • some display elements contain red particles, some display elements contain green particles, and some display elements contain blue particles, respectively.
  • some display elements contain cyan particles, some display elements contain magenta particles, and some display elements contain yellow particles, respectively.
  • Electronic ink is capable of being printed by several different processes, depending on the mechanical properties of the specific ink employed. For example, the fragility or viscosity of a particular ink may result in a different process selection. A very viscous ink would not be well-suited to deposition by an inkjet printing process, while a fragile ink might not be used in a knife over roll coating process.
  • the optical quality of an electronic ink is quite distinct from other electronic display materials.
  • the most notable difference is that the electronic ink provides a high degree of both reflectance and contrast because it is pigment based (as are ordinary printing inks).
  • the light scattered from the electronic ink comes from a very thin layer of pigment close to the viewing surface. In this respect it resembles an ordinary, printed image.
  • electronic ink is easily viewed from a wide range of viewing angles in the same manner as a printed page, and such ink approximates a Lambertian contrast curve more closely than any other electronic display material. Since electronic ink can be printed, it can be included on the same surface with any other printed material, including traditional inks.
  • Electronic ink can be made optically stable in all display configurations, that is, the ink can be set to a persistent optical state. Fabrication of a display by printing an electronic ink is particularly useful in low power applications because of this stability.
  • Electronic ink displays are novel in that they can be addressed by DC voltages and draw very little current. Therefore, elements forming electronic inks may be made of non-traditional materials and electronic inks may be manufactured by and used in non-traditional methods. As such, the conductive leads and electrodes used to deliver the voltage to electronic ink displays can be of relatively high resistivity. The ability to use resistive conductors substantially widens the number and type of materials that can be used as conductors in electronic ink displays. In particular, the use of costly vacuum-sputtered indium tin oxide (ITO) conductors, a standard material in liquid crystal devices, is not required.
  • ITO indium tin oxide
  • the replacement of ITO with other materials can provide benefits in appearance, processing capabilities (printed conductors), flexibility, and durability. Additionally, the printed electrodes are in contact only with a solid binder, not with a fluid layer (like liquid crystals). This means that some conductive materials, which would otherwise dissolve or be degraded by contact with liquid crystals, can be used in an electronic ink application. These include opaque metallic inks for the rear electrode (e.g., silver and graphite inks), as well as conductive transparent inks for either substrate. These conductive coatings include semiconducting colloids, examples of which are indium tin oxide and antimony-doped tin oxide.
  • Organic conductors (polymeric conductors and molecular organic conductors) also may be used.
  • Polymers include, but are not limited to, polyaniline and derivatives, polythiophene and derivatives, poly3,4-ethylenedioxythiophene (PEDOT) and derivatives, polypyrrole and derivatives, and polyphenylenevinylene (PPV) and derivatives.
  • Organic molecular conductors include, but are not limited to, derivatives of naphthalene, phthalocyanine, and pentacene.
  • Polymer layers can be made thinner and more transparent than with traditional displays because conductivity requirements are not as stringent.
  • electroconductive powders which are also useful as coatable transparent conductors in electronic ink displays.
  • electroconductive powders which are also useful as coatable transparent conductors in electronic ink displays.
  • Zelec ECP electroconductive powders from DuPont Chemical Co. of Wilmington, Del.
  • Emissive or transmissive displays operate according to additive rules, where the perceived color is created by summing the emission wavelengths of a plurality of emitting or transmitting objects.
  • emissive or transmissive display that includes three display elements, one of which can produce red light, one green light, and one blue light, respectively, one can generate a wide gamut of colors, as well as white and black. At one extreme, the combination of all three at full intensity is perceived as white, and at the other, the combination of all three at zero intensity is perceived as black. Specific combinations of controlled proportions of these three colors can be used to represent other colors.
  • the light that a viewer perceives is the portion of the spectrum that is not absorbed when the light to be reflected falls on the reflector surface.
  • a reflecting system that is, that each reflective surface “subtracts” from the light that portion which the reflector absorbs.
  • the color of a reflector represents the wavelengths of light the reflector absorbs.
  • a yellow reflector absorbs substantially blue light.
  • a magenta reflector absorbs substantially green light.
  • a cyan reflector absorbs substantially red light.
  • any combination of dyes, liquids droplets and transparent regions that respond to electrophoretic effects could also be used.
  • Particles of various optical effects may be combined in any suitable proportion. For example, certain colors may be over- or under-populated in the electrophoretic display, for example, by printing more display elements of one color than of another color, to account for the sensitivities of the human eye and to thereby achieve a more pleasing or uniform effect. Similarly, the sizes of the display elements may also be disproportionate to achieve various optical effects.
  • microencapsulated electrophoretic displays the invention can be utilized across other reflective displays including liquid crystal, polymer-dispersed liquid crystal, rotating ball, suspended particle and any other reflective display capable of being printed.
  • many schemes are possible by which display elements in a direct color reflective display can be printed. Such printing schemes will vary by the nature of the display and any suitable means may be used.
  • FIGS. 1A and 1B an addressing scheme for controlling particle-based displays is shown in which electrodes are disposed on only one side of a display, allowing the display to be rear-addressed. Utilizing only one side of the display for electrodes simplifies fabrication of displays. For example, if the electrodes are disposed on only the rear side of a display, both of the electrodes can be fabricated using opaque materials, which may be colored, because the electrodes do not need to be transparent.
  • FIG. 1A depicts a single capsule 20 of an encapsulated display media.
  • the embodiment depicted in FIG. 1A includes a capsule 20 containing at least one particle 50 dispersed in a suspending fluid 25 .
  • the capsule 20 is addressed by a first electrode 30 and a second electrode 40 .
  • the first electrode 30 is smaller than the second electrode 40 .
  • the first electrode 30 and the second electrode 40 may be set to voltage potentials which affect the position of the particles 50 in the capsule 20 .
  • the particles 50 represent 0.1% to 20% of the volume enclosed by the capsule 20 . In some embodiments the particles 50 represent 2.5% to 17.5% of the volume enclosed by capsule 20 . In preferred embodiments, the particles 50 represent 5% to 15% of the volume enclosed by the capsule 20 . In more preferred embodiments the particles 50 represent 9% to 11% of the volume defined by the capsule 20 . In general, the volume percentage of the capsule 20 that the particles 50 represent should be selected so that the particles 50 expose most of the second, larger electrode 40 when positioned over the first, smaller electrode 30 . As described in detail below, the particles 50 may be colored any one of a number of colors. The particles 50 may be either positively charged or negatively charged.
  • the particles 50 are dispersed in a dispersing fluid 25 .
  • the dispersing fluid 25 should have a low dielectric constant.
  • the fluid 25 may be clear, or substantially clear, so that the fluid 25 does not inhibit viewing the particles 50 and the electrodes 30 , 40 from position 10 .
  • the fluid 25 is dyed.
  • the dispersing fluid 25 has a specific gravity substantially matched to the density of the particles 50 . These embodiments can provide a bistable display media, because the particles 50 do not tend to move absent an electric field applied via the electrodes 30 , 40 .
  • the electrodes 30 , 40 should be sized and positioned appropriately so that together they address the entire capsule 20 . There may be exactly one pair of electrodes 30 , 40 per capsule 20 , multiple pairs of electrodes 30 , 40 per capsule 20 , or a single pair of electrodes 30 , 40 may span multiple capsules 20 . In the embodiment shown in FIGS. 1A and 1B, the capsule 20 has a flattened, rectangular shape. In these embodiments, the electrodes 30 , 40 should address most, or all, of the flattened surface area adjacent the electrodes 30 , 40 . The smaller electrode 30 is at most one-half the size of the larger electrode 40 .
  • the smaller electrode is one-quarter the size of the larger electrode 40 ; in more preferred embodiments the smaller electrode 30 is one-eighth the size of the larger electrode 40 . In even more preferred embodiments, the smaller electrode 30 is one-sixteenth the size of the larger electrode 40 .
  • reference to “smaller” in connection with the electrode 30 means that the electrode 30 addresses a smaller amount of the surface area of the capsule 20 , not necessarily that the electrode 30 is physically smaller than the larger electrode 40 .
  • multiple capsules 20 may be positioned such that less of each capsule 20 is addressed by the “smaller” electrode 30 , even though both electrodes 30 , 40 are equal in size. It should also be noted that, as shown in FIG.
  • electrode 30 may address only a small corner of a rectangular capsule 20 (shown in phantom view in FIG. 1C), requiring the larger electrode 40 to surround the smaller electrode 30 on two sides in order to properly address the capsule 20 .
  • electrodes may be of any shape, such as concentric rings or rectangles. Selection of the percentage volume of the particles 50 and the electrodes 30 , 40 in this manner allow the encapsulated display media to be addressed as described below.
  • Electrodes generally may be fabricated from any material capable of conducting electricity so that electrode 30 , 40 may apply an electric field to the capsule 20 .
  • conductive material may be printed by using conductive ink.
  • Conductive inks are well known and may be prepared by including in the ink fluid a conductive material such as powdered metal or powdered graphite.
  • the rear-addressed embodiments depicted in FIGS. 1A and 1B allow the electrodes 30 , 40 to be fabricated from opaque materials such as solder paste, copper, copper-clad polyimide, graphite inks, silver inks and other metal-containing conductive inks.
  • electrodes may be fabricated using transparent materials such as indium tin oxide and conductive polymers such as polyaniline or polythiopenes. Electrodes 30 , 40 may be provided with contrasting optical properties. In some embodiments, one of the electrodes has an optical property complementary to optical properties of the particles 50 . Alternatively, since the electrodes need not be transparent, an electrode can be constructed so as to display a selected color. Since electric current is not always required to be conducted from an electrode to a display element, but is only required to flow within the electrode to set up an electric field, one is in general able to overcoat the electrode with a colored ink so as to impart a desired color to an electrode, without detrimental effect on the operation of an electrode.
  • the capsule 20 contains positively charged black particles 50 , and a substantially clear suspending fluid 25 .
  • the first, smaller electrode 30 is colored black, and is smaller than the second electrode 40 , which is colored white or is highly reflective.
  • the positively-charged particles 50 migrate to the smaller, black electrode 30 .
  • the effect to a viewer of the capsule 20 located at position 10 is a mixture of the larger, white electrode 40 and the smaller, black electrode 30 , creating an effect which is largely white. Referring to FIG.
  • the capsule 20 may be addressed to display either a white visual state or a black visual state.
  • varying the color of the smaller electrode 30 and the particles 50 allows fabrication of a rear-addressed, two-color display having black as one of the colors.
  • varying the color of the smaller electrode 30 and the particles 50 allow a rear-addressed two-color system to be fabricated using white as one of the colors.
  • the particles 50 and the smaller electrode 30 can be different colors.
  • a two-color display may be fabricated having a second color that is different from the color of the smaller electrode 30 and the particles 50 .
  • a rear-addressed, orange-white display may be fabricated by providing blue particles 50 , a red, smaller electrode 30 , and a white (or highly reflective) larger electrode 40 .
  • the optical properties of the electrodes 30 , 40 and the particles 50 can be independently selected to provide desired display characteristics.
  • the optical properties of the dispersing fluid 25 may also be varied, e.g. the fluid 25 may be dyed.
  • this technique may be used to provide a full color display.
  • FIGS. 1D and 1E an embodiment is depicted that comprises three display elements.
  • an element may have any shape and a display may be comprised of display elements that are unequal in size or shape, or alternatively the display may be comprised of display elements that are unequal in number by color or optical property.
  • the display elements may each be formed as a single large capsule, or each may be distributed across any number of small capsules or cells. For the purposes of illustration, the simpler case of a single large capsule for each display element is shown.
  • a first capsule 20 contains positively charged black particles 50 and a substantially clear suspending fluid 25 .
  • a first, smaller electrode 30 is colored black, and is smaller than the second electrode 40 , which is colored red.
  • the positively-charged particles 50 migrate to the smaller, black electrode 30 .
  • the effect to a viewer of the capsule 20 located at position 10 is a mixture of the larger, red electrode 40 and the smaller, black electrode 30 , creating an effect which is largely red.
  • the first capsule 20 may be addressed to display either a red visual state or a black visual state.
  • a second capsule 20 ′ contains positively charged black particles 50 ′ and a substantially clear suspending fluid 25 ′.
  • a first, smaller electrode 30 ′ is colored black, and is smaller than the second electrode 40 ′, which is colored green.
  • the smaller, black electrode 30 ′ is placed at a negative voltage potential relative to larger, green electrode 40 ′, the positively-charged particles 50 ′ migrate to the smaller, black electrode 30 ′.
  • the effect to a viewer of the capsule 20 ′ located at position 10 ′ is a mixture of the larger, green electrode 40 ′ and the smaller, black electrode 30 ′, creating an effect which is largely green.
  • a third capsule 20 ′′ contains positively charged black particles 50 ′′ and a substantially clear suspending fluid 25 ′′.
  • a first, smaller electrode 30 ′′ is colored black, and is smaller than the second electrode 40 ′′, which is colored blue.
  • the effect to a viewer of the capsule 20 ′′ located at position 10 ′′ is a mixture of the larger, blue electrode 40 ′′ and the smaller, black electrode 30 ′′, creating an effect which is largely blue.
  • the smaller, black electrode 30 ′′ is placed at a positive voltage potential relative to the larger, blue electrode 40 ′′, particles 50 ′′ migrate to the larger, blue electrode 40 ′′ and the viewer is presented a mixture of the black particles 50 ′′ covering the larger, blue electrode 40 ′′ and the smaller, black electrode 30 ′′, creating an effect which is largely black.
  • the relative intensities of these colors can be controlled by the actual voltage potentials applied to the electrodes. By choosing appropriate combinations of the three colors, one may create a visual display which appears as the effective combination of the selected colors as an additive process.
  • the first, second and third capsules can have larger electrodes 40 , 40 ′, 40 ′′ which are respectively colored cyan, yellow, and magenta. Operation of the alternative cyan, yellow, and magenta embodiment is analogous to that of the red, green, and blue embodiment, with the feature that the color to be displayed is selected by a subtractive process.
  • the larger electrode 40 may be transparent or reflective instead of white.
  • the particles 50 when the particles 50 are moved to the smaller electrode 30 , light reflects off the reflective surface of the larger electrode 40 and the capsule 20 appears light in color, e.g. white.
  • the reflecting surface is obscured and the capsule 20 appears dark because light is absorbed by the particles 50 before reaching the reflecting surface.
  • proper switching of the particles may be accomplished with a combination of alternating-current (AC) and direct-current (DC) electric fields.
  • AC alternating-current
  • DC direct-current
  • the rear-addressed display previously discussed can be configured to transition between largely transmissive and largely opaque modes of operation (referred to hereafter as “shutter mode”).
  • shutter mode largely transmissive and largely opaque modes of operation
  • the capsule 20 contains at least one positively-charged particle 50 dispersed in a substantially clear dispersing fluid 25 .
  • the larger electrode 40 is transparent and the smaller electrode 30 is opaque.
  • the smaller, opaque electrode 30 is placed at a negative voltage potential relative to the larger, transmissive electrode 40 , the particles 50 migrate to the smaller, opaque electrode 30 .
  • the effect to a viewer of the capsule 20 located at position 10 is a mixture of the larger, transparent electrode 40 and the smaller, opaque electrode 30 , creating an effect which is largely transparent.
  • FIG. 1B when the smaller, opaque electrode 30 is placed at a positive voltage potential relative to the larger, transparent electrode 40 , particles 50 migrate to the second electrode 40 and the viewer is presented a mixture of the opaque particles 50 covering the larger, transparent electrode 40 and the smaller, opaque electrode 30 , creating an effect which is largely opaque.
  • a display formed using the capsules depicted in FIGS. 1A and 1B may be switched between transmissive and opaque modes.
  • the electrodes may be disposed on the viewing side of the capsule 20 .
  • FIGS. 1 A- 1 D depict a pair of electrodes associated with each capsule 20 , it should be understood that each pair of electrodes may be associated with more than one capsule 20 .
  • a capsule 20 contains at least one dark or black particle 50 dispersed in a substantially clear dispersing fluid 25 .
  • a smaller, opaque electrode 30 and a larger, transparent electrode 40 apply both direct-current (DC) electric fields and alternating-current (AC) fields to the capsule 20 .
  • a DC field can be applied to the capsule 20 to cause the particles 50 to migrate towards the smaller electrode 30 .
  • the smaller electrode is placed a voltage that is more negative than the larger electrode 40 .
  • FIGS. 3 A- 3 D depict only one capsule per electrode pair, multiple capsules may be addressed using the same electrode pair.
  • the smaller electrode 30 is at most one-half the size of the larger electrode 40 . In preferred embodiments the smaller electrode is one-quarter the size of the larger electrode 40 ; in more preferred embodiments the smaller electrode 30 is one-eighth the size of the larger electrode 40 . In even more preferred embodiments, the smaller electrode 30 is one-sixteenth the size of the larger electrode 40 .
  • Causing the particles 50 to migrate to the smaller electrode 30 allows incident light to pass through the larger, transparent electrode 40 and be reflected by a reflecting surface 60 .
  • the reflecting surface 60 is replaced by a translucent layer, a transparent layer, or a layer is not provided at all, and incident light is allowed to pass through the capsule 20 , i.e. the capsule 20 is transmissive.
  • the translucent layer or the transparent layer comprises a color, such as a color filter, the light that is transmitted will be those wavelengths that the filter passes, and the reflected light will consist of those wavelengths that the filter reflects, while the wavelengths that the filter absorbs will be lost.
  • the visual appearance of a shutter mode display may thus depend on whether the display is in a transmissive or reflective condition, on the characteristics of the filter, and on the position of the viewer.
  • the particles 50 are dispersed throughout the capsule 20 by applying an AC field to the capsule 20 via the electrodes 30 , 40 .
  • the particles 50 dispersed into the capsule 20 by the AC field, block incident light from passing through the capsule 20 , causing it to appear dark at the viewpoint 10 .
  • the embodiment depicted in FIGS. 3 A- 3 B may be used in shutter mode by not providing the reflecting surface 60 and instead providing a translucent layer, a transparent layer, a color filter layer, or no layer at all.
  • application of an AC electric field causes the capsule 20 to appear opaque.
  • the transparency of a shutter mode display formed by the apparatus depicted in FIGS. 3 A- 3 D may be controlled by the number of capsules addressed using DC fields and AC fields. For example, a display in which every other capsule 20 is addressed using an AC field would appear about half as transmissive as when the particles are all addressed by the AC field.
  • FIGS. 3C and 3D depict an embodiment of the electrode structure described above in which electrodes 30 , 40 are on “top” of the capsule 20 , that is, the electrodes 30 , 40 are between the viewpoint 10 and the capsule 20 .
  • both electrodes 30 , 40 should be transparent.
  • Transparent conducting layers can be fabricated using conductive polymers, such as polyaniline, polythiophenes, indium tin oxide, or polymers containing conducting particles less than 100 nanometers in diameter such as copper iodide, ionic polymers, or slat-doped polymers.
  • Electrodes can be fabricated using coating techniques such as spin coating, spray coating, meniscus coating, printing techniques, forward and reverse roll coating and the like.
  • light passes through the electrodes 30 , 40 and is either absorbed by the particles 50 , reflected by reflecting layer 60 (when provided), transmitted throughout the capsule 20 (when reflecting layer 60 is not provided), or partially transmitted and/or reflected if a color filter is present in place of retroreflecting layer 60 .
  • each display element capsule 22 , 22 ′ and 22 ′′ each contain at least one white particle 50 dispersed in a substantially clear dispersing fluid 25 .
  • each display element capsule 22 , 22 ′ and 22 ′′ has a transparent electrode 42 , 42 ′, and 42 ′′ disposed above it and a colored filter 60 , 60 ′ and 60 ′′ disposed below it.
  • a common reflective surface 70 may be shared behind the color filter layer.
  • the display includes an emissive light source 70
  • Smaller, opaque electrodes 30 , 30 ′ and 30 ′′ and larger, transparent electrodes 40 , 40 ′ and 40 ′′ may apply direct-current (DC) electric fields and alternating-current (AC) fields to the capsules 20 , 20 ′ and 20 ′′.
  • a DC field can be applied to the capsules 20 , 20 ′ and 20 ′′ to cause the particles 50 , 50 ′ 50 ′′ to migrate towards the smaller electrodes 30 , 30 ′ and 30 ′′.
  • the smaller electrodes 30 , 30 ′ and 30 ′′ are placed a voltage that is more negative than the larger electrodes 40 , 40 ′ and 40 ′′.
  • the smaller electrode 30 is at most one-half the size of the larger electrode 40 . In preferred embodiments the smaller electrode 30 is one-quarter the size of the larger electrode 40 ; in more preferred embodiments the smaller electrode 30 is one-eighth the size of the larger electrode 40 . In even more preferred embodiments, the smaller electrode 30 is one-sixteenth the size of the larger electrode 40 .
  • the filter layer 60 may be a translucent layer, a transparent layer, a color filter layer, or a layer is not provided at all, and further substrate 70 may be reflective, emissive, translucent or not provided at all. If the layer 60 comprises a color, such as a color filter, the light which is transmitted will be those wavelengths that the filter passes, and the reflected light will consist of those wavelengths that the filter reflects, while the wavelengths that the filter absorbs will be lost. The visual appearance of a the display element in 3 E may thus depend on whether the display is in a transmissive or reflective condition, on the characteristics of the filter, and on the position of the viewer. In an alternative embodiment layer 60 may be provided on top of the capsule adjacent to electrode 42 .
  • Clear electrode 42 allows light to pass into capsule 22 and to strike either white particles W, red particles R, or a colored substrate 60 .
  • the substrate 60 can be a combination of color filter and non-colored substrate or it can be provided as a unitary colored substrate.
  • Capsule 22 also includes a suspending fluid that can be dye-colored (possibly eliminating the need for a separate color filter 60 ) or substantially clear.
  • Electrodes 45 and 35 are transparent and may be equally sized or sized in any suitable manner taking into account the relative particles sizes and mobilities of particles W and R. A gap exists between 45 and 35 . Assume that particles W are negatively charged and particles R are positively charged. In FIG.
  • top electrode 42 is set at a positive voltage potential relative to bottom electrodes 35 and 45 , moving particles W to the top and particles R to the bottom and thus white is displayed.
  • red is displayed in both FIGS. 3F and 3G .
  • electrode 45 is at a negative voltage potential relative to electrode 35
  • electrode 42 is at a voltage potential between the potentials of 45 and 35 , such as zero.
  • electrode 42 switches between the potentials of 45 and 35 so that over time the effective voltage of 42 is again between the potentials of 45 and 35 .
  • the color combinations can differ.
  • the specific colors of the filters and particles need not differ.
  • This system called “dual particle curtain mode,” can image three arbitrary colors. In a preferred embodiment the colors are as described wherein one color is white and the other two colors are complements. In this manner, referring again to FIG. 3H, if a small portion of red is visible it absorbs part of the light reflected from the cyan substrate and the net result is black, which may be offset by a small portion of visible white. Thus, the element in FIG. 3H may appear to be cyan even if some red and white is visible. As mentioned above, the edges of the element may be masked to hide particles R and W when in the mode shown in FIG. 3H.
  • FIG. 3I a full-color element is shown comprising three display elements, each operating in the manner taught by FIGS. 3 F- 3 H wherein the colored particles are positively charged, and the white particles are negatively charged.
  • the system may still function with top electrode 42 extended as a common top electrode as shown in FIG. 3I.
  • electrodes 42 , 45 , 35 , 45 ′, 35 ′, 45 ′′, 35 ′′ may be set to voltage potentials ⁇ 30V, 60V, 60V, ⁇ 60V, +60V, ⁇ 60V, +60V respectively.
  • FIGS. 3 J- 3 K an electrode scheme is shown whereby a cluster of microcapsules may be addressed for an entire display element in a manner similar to those described above.
  • Clear electrode 42 allows light to pass into microcapsules 27 and to strike either white particles W, red particles R, or colored substrate 60 .
  • colored substrate 60 may be a combination of color filter and non-colored substrate 60 or colored substrate 60 may be provided as a unitary colored substrate.
  • Capsules 27 include a suspending fluid that may be dye-colored (possibly eliminating the need for a separate color filter 60 ) or substantially clear.
  • Electrodes 45 and 35 are transparent and may be equally sized or sized in any suitable manner taking into account the relative particle sizes and mobilities of particles W and R.
  • FIG. 3K illustrates an embodiment of a suitable electrode pattern in which 45 and 35 are interdigitated.
  • capsule 22 includes a suspending fluid 62 that is dyed cyan.
  • suspending fluid 62 is substantially clear and a third species of cyan particles C is included in capsules 22 .
  • the cyan particles have a relatively neutral charge.
  • FIGS. 3 A- 3 M may be used with electrophoretic display media and encapsulated electrophoretic display media.
  • FIGS. 3 A- 3 M depict embodiments in which electrode 30 , 40 are statically attached to the display media.
  • the particles 50 exhibit bistability, that is, they are substantially motionless in the absence of a electric field.
  • a preferred substrate for this use is an electroluminiscent (EL) backlight.
  • EL electroluminiscent
  • Such a backlight can be reflective when inactive, often with a whitish-green color, yet emit lights in various wavelengths when active.
  • whitish EL substrates in place of static white reflective substrates, it is possible to construct a full-color reflective display that can also switch its mode of operation to display a range of colors in an emissive state, permitting operation in low ambient light conditions.
  • FIGS. 4A and 4B depict an embodiment of a rear-addressing electrode structure that creates a reflective color display in a manner similar to halftoning or pointillism.
  • the capsule 20 contains white particles 55 dispersed in a clear suspending fluid 25 .
  • Electrodes 42 , 44 , 46 , 48 are colored cyan, magenta, yellow, and white respectively.
  • FIG. 4A when the colored electrodes 42 , 44 , 46 are placed at a positive potential relative to the white electrode 48 , negatively-charged particles 55 migrate to these three electrodes, causing the capsule 20 to present to the viewpoint 10 a mix of the white particles 55 and the white electrode 48 , creating an effect which is largely white.
  • FIG. 4A when the colored electrodes 42 , 44 , 46 are placed at a positive potential relative to the white electrode 48 , negatively-charged particles 55 migrate to these three electrodes, causing the capsule 20 to present to the viewpoint 10 a mix of the white particles 55 and the white electrode 48 , creating an effect which is largely white
  • any color can be produced that is possible with a subtractive color process.
  • the yellow electrode 46 and the magenta electrode 42 are set to a voltage potential that is more positive than the voltage potential applied by the cyan electrode 42 and the white electrode 48 .
  • the relative intensities of these colors can be controlled by the actual voltage potentials applied to the electrodes.
  • AC current may be used appropriately to randomize the position of the particles as a step in this process.
  • FIGS. 4A and 4B could be used in a similar manner with fewer electrodes and controlling fewer colors. For example, if electrode 42 were not present, the element could still display three colors. If electrodes 44 and 46 were colored red and cyan respectively, the capsule could display red, cyan and white. This construction could be used then employed as a display element, to be matched with similar display elements displaying other trios of colors thus achieving a full-color display as described above.
  • the addressing structures described in FIGS. 1 - 4 B typically comprise a top electrode controlled by display driver circuitry. It may be seen that if the top electrode is absent, the display may be imaged by an externally applied voltage source, such as a passing stylus or electrostatic print head. The means that techniques applied above to generate a full-color electrophoretic display could also be applied for a full-color electrophoretic media.
  • color electrophoretic displays require careful registration of display elements to the electrodes used to address those display elements. Referring now to FIG. 5, steps that may be taken to efficiently and cheaply manufacture a display while avoiding the registration problems of prior art display are shown.
  • a substrate is provided that has at least two electrodes (step 502 ).
  • the number of electrodes provided will vary depending on the number of regions to be individually addressed. For example, in a traditional RGB display, three electrodes or sets of electrodes may be provided in order to address red capsules, green capsules, and blue capsules.
  • the electrodes may have a predetermined pattern of interest.
  • a display may include both electronic ink and traditional, printed inks. In such a display, the electrodes may be patterned to address only those portions of the display meant to bear electronic ink.
  • the substrate is provided and the electrodes are printed on the substrate using any one of a number of printing techniques.
  • FIG. 6 the structure of a printed electrode is shown.
  • a conductive material 162 can be printed onto an insulative substrate 160 .
  • the substrate 160 defines one or more vias 164 that allow the printed conductive material 162 to be driven by addressing logic 166 .
  • the addressing logic 166 may also be printed.
  • a first plurality of electrophoretic display elements is selectively printed on the substrate in substantial registration with at least one of the electrodes disposed on the substrate (step 504 ).
  • the electrophoretic display elements generally are capsules containing one or more species of particles in a dispersing fluid as described above in connection with FIGS. 1 - 4 B.
  • the display elements which may form the contrast phase of an electronic ink, may be printed onto the substrate using any of the printing techniques described above. In certain embodiments, the printing technique itself provides the accuracy necessary to register the display elements to the appropriate electrode.
  • an ink-jet printing process could be used to print red capsules in substantial registration with a “red” electrode, green capsules in substantial registration with a “green” electrode, and blue capsules in substantial registration with a “blue” electrode.
  • the capsules can be printed sequentially or an ink-jet head may be used that allows red, green, and blue capsules to be simultaneously printed in a selective fashion.
  • the display elements may be coated onto the substrate using an intermediate having a substantially cylindrical surface or a substantially flat surface, such as a lithographic belt.
  • the intermediate is a roller, belt, blotter, brush, or sponge.
  • the display elements may be held to the intermediate by electrostatic forces, surface tension, chemical bonding forces, or an applied electric field.
  • the properties of the binder phase An be adjusted to match the desired printing process. For example, an ink to be used in inkjet printing may be adjusted to have a low viscosity. An ink suitable for lithographic printing may be adjusted to have a suitable contact angle.
  • the display elements can be dispersed in a suitable carrier fluid such as water or an organic solvent that is dried after coating.
  • the carrier fluid can also contain agents to modify surface tension, contact angle, viscosity, or electrical conductivity.
  • the binder phase may contain monomers, oligomers, polymers, or polymerization inhibitors. These components can be used to form physically robust display element layers.
  • the display elements could be dispersed in a low viscosity water solution containing a polymer. This solution could be inkjet printed in registration with the appropriate electrode pattern.
  • the display element can be dispersed in an ultraviolet-curable resin used in lithographic printing processes, deposited on the appropriate electrodes by a lithographic process, and cured to form the display element layer. In all cases, the display elements are printed in substantial registration with the appropriate electrodes.
  • the electronic ink is coated onto the substrate using an appropriate coating method such as knife-over-roll coating, silk-screen printing processes, brushing or other non-patterned coating techniques.
  • an electric signal is applied to the electrode to which the display elements should be registered. Application of an electric signal attracts the display elements proximate the electrode.
  • the applied signal overcomes the forces holding the display elements to the carrier and transfers the elements to the substrate adjacent the electrode.
  • the display elements can be dispersed in a low viscosity liquid, such as low molecular weight hydrocarbons like methylethylketone or cyclohexane, or alcohols such as ethanol or propanol.
  • the display elements are then treated to produce a controlled surface charge by, for example, adjusting the pH of the dispersing liquid or adding surface active agents such as soaps, detergents, or other dispersants. Because the charge of the display elements is controlled, an electric charge can be use to transfer the display elements to the appropriate electrode.
  • Other display elements may then be removed from the substrate, e.g. by washing the substrate, to leave only the display elements that are proximate to the electrode.
  • a second plurality of electrophoretic display elements are selectively deposited on the substrate in substantial registration with another electrode (step 506 ) using techniques similar to those just described.
  • the technique used to selectively deposit the first plurality of display elements need not be the same technique as that used to selectively deposit the second plurality of display elements.
  • This technique for printing displays can be used to build the rear electrode structure on a display or to construct two separate layers that are laminated together to form the display.
  • an electronically active ink may be printed on an indium tin oxide electrode.
  • a rear electrode structure as described above can be printed on a suitable substrate, such as plastic, polymer films, or glass.
  • the electrode structure and the display element can be laminated to form a display.

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  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
  • Manufacturing Of Micro-Capsules (AREA)
US09/349,806 1998-07-08 1999-07-08 Methods for achieving improved color in microencapsulated electrophoretic devices Abandoned US20020113770A1 (en)

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US12/609,158 US9293511B2 (en) 1998-07-08 2009-10-30 Methods for achieving improved color in microencapsulated electrophoretic devices
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JP5047331B2 (ja) 2012-10-10
US9293511B2 (en) 2016-03-22
US20100156780A1 (en) 2010-06-24
US20100103502A1 (en) 2010-04-29
DE69920228D1 (de) 2004-10-21
US20040190114A1 (en) 2004-09-30
US7667684B2 (en) 2010-02-23
DE69934618T2 (de) 2007-05-03
EP1093600B1 (fr) 2004-09-15
JP2002520655A (ja) 2002-07-09
EP1754995B1 (fr) 2012-04-04
ATE276536T1 (de) 2004-10-15
ATE349722T1 (de) 2007-01-15
WO2000003291A9 (fr) 2000-07-27
WO2000003291A1 (fr) 2000-01-20
EP1754995A2 (fr) 2007-02-21
ATE552530T1 (de) 2012-04-15
EP1754995A3 (fr) 2007-05-23
EP1093600A1 (fr) 2001-04-25
DE69920228T2 (de) 2005-01-27
AU5094699A (en) 2000-02-01
JP2010217916A (ja) 2010-09-30
JP4568429B2 (ja) 2010-10-27
DE69934618D1 (de) 2007-02-08

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