WO1992011625A1 - Panneau d'affichage electrophoretique a capacite amelioree - Google Patents

Panneau d'affichage electrophoretique a capacite amelioree Download PDF

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Publication number
WO1992011625A1
WO1992011625A1 PCT/US1991/008131 US9108131W WO9211625A1 WO 1992011625 A1 WO1992011625 A1 WO 1992011625A1 US 9108131 W US9108131 W US 9108131W WO 9211625 A1 WO9211625 A1 WO 9211625A1
Authority
WO
WIPO (PCT)
Prior art keywords
members
fluid
cathode
envelope
grid
Prior art date
Application number
PCT/US1991/008131
Other languages
English (en)
Inventor
Frank J. Disanto
Denis A. Krusos
Original Assignee
Copytele, Inc.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Copytele, Inc. filed Critical Copytele, Inc.
Publication of WO1992011625A1 publication Critical patent/WO1992011625A1/fr

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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3433—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices
    • G09G3/344—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices based on particles moving in a fluid or in a gas, e.g. electrophoretic devices
    • 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

Definitions

  • Electrophoretic Display Panel Having Enhanced Operation
  • the present invention relates to an electrophoretic display panel, and more particularly to an electrophoretic display panel having enhanced clarity and uniformity along the periphery of the display.
  • Electrophoretic display panels are well known. Each operates upon the same basic principle, viz., if a suspension of electrically charged pigment particles in a dielectric fluid is subjected to an applied electrostatic field, the pigment particles will migrate through the fluid in response to the electrostatic field. Given a substantially homogeneous suspension of particles having a pigment color different from that of the dielectric fluid, if the applied electrostatic field is localized it will cause a visually observable localized pigment particle migration. The localized pigment particle migration results either in a localized area of concentration or rarefaction of particles depending upon the sign and direction of the electrostatic force and the charge on the pigment particles.
  • the foregoing principles have been utilized in a variety of electrophoretic display designs. An example of an electrophoretic display apparatus is shown in U.S. Patent No. 4,742,345 to
  • the device described in the foregoing patent is a triode type display having a plurality of independent, parallel cathode conductor members deposited in the horizontal on one surface of a glass viewing screen.
  • a glass cap member forms a fluid-tight seal with the viewing window along the cap's peripheral edge for containing the fluid suspension and also acts as a substrate for the anode which is a conductive layer deposited on the interior flat surface of the cap.
  • the anode surface is in spaced parallel relation to both the cathode members and the grid members. Given a specific particulate suspension, the sign of the electrostatic charge which will attract and repel the pigment particles will be known.
  • the cathode member voltage and the grid member voltage can then be ascertained such that when a particular voltage is applied to a cathode member and another voltage is applied to a grid member, the area proximate their intersection will assume a net charge sufficient to attract or repel pigment particles in suspension in the dielectric fluid. Since numerous cathode and grid lines are employed, there are numerous discrete intersection points which can be controlled by varying the voltage on the cathode and grid members to cause localized visible regions of pigment concentration and rarefaction. Essentially then, the operating voltages on both cathode and grid must be able to assume at least two states corresponding to a logical one and a logical zero.
  • the cathode and grid voltages are selected such that only when both are a logical one at a particular intersection point, will a sufficient electrostatic field be present at the intersection to cause the writing of a visual bit of information on the display.
  • the bit may be erased upon a zero-zero state occurring at the intersection.
  • digitized data can be displayed on the electrophoretic display.
  • the cathode and grid members of this known device each have a contact end which protrudes beyond the anode cap, enabling a drive source to be independently applied to each cathode and grid element.
  • the ends of the cathode and grid elements distal to the contact pads were positioned within the fluid-tight enclosure such that the ends were exposed to the enclosed fluid and the suspended particles.
  • the present invention includes a fluid-tight envelope having a portion thereof which is at least partially transparent and an electrophoretic fluid contained within the envelope.
  • the fluid has pigmented particles suspended in it.
  • a plurality of elongated conductor members pass through the envelope and the fluid with both ends of the conductor members extending from the envelope.
  • the conductor members are selectively electrically chargeable to induce movement of the particles within the fluid, the movement of said particles being at least partially visible through the transparent portion of the envelope.
  • FIG. 1 is an exploded perspective rear view of a triode-type electrophoretic display panel in accordance with an exemplary embodiment of the present invention.
  • FIG.2 is a diagrammatic depiction of the position of the grid and cathode members relative to the border of the anode cap utilized in prior art electrophoretic displays.
  • FIG. 3 is a diagrammatic depiction of the position of the grid and cathode members relative to the border of the anode cap utilized in the present invention. Best Mode For Carrying Out The Invention
  • FIG. 1 shows the rear side of an electrophoretic display panel 10 in accordance with the present invention.
  • the panel 10 includes a glass faceplate 12 upon which is deposited a plurality of independent, horizontal, electrically conductive cathode members 14 (rows) using conventional deposition and etching techniques.
  • a plurality of vertically oriented grid conductors 16 are superimposed over the cathode members 14 and are insulated therefrom by an interstitial photoresist layer (not shown) .
  • Each cathode and grid conductor 14 and 16 terminates at one end in a contact pad 18 to permit the display 10 to be connected to display driver circuitry (not shown) .
  • An anode cap 20 is sealably affixed to the faceplate 12 and over the cathode and grid conductors 14 and 16 to form an envelope for containing the dielectric fluid/pigment particle suspension.
  • the anode cap 20 is formed from an insulating material, such as glass, and has an inner surface coating of conductor material to form the anode plate of a triode.
  • FIG. 1 does depict a feature of the present invention which is not shown in the prior art, viz., that the dimensions and positions of the cathode and grid conductors 14 and 16 are selected such that no terminal free end thereof is exposed to the dielectric fluid. This is accomplished by extending the ends of the cathode and grid conductors distal to the contact pads 18 such that they extend beyond the peripheral sealing edge of the anode cap 20.
  • FIG. 2 illustrates the termination of cathode and grid conductors 14 and 16 within the anode seal 22 on the face plate 12 as was the practice in the prior art.
  • FIG. 2 illustrates the termination of cathode and grid conductors 14 and 16 within the anode seal 22 on the face plate 12 as was the practice in the prior art.
  • This arrangement results in the observation of the detrimental effects noted earlier, under certain operating conditions and thus to provide a display having poor image quality around its periphery (the location of the terminal contained ends) .
  • the present invention as depicted in FIG.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Molecular Biology (AREA)
  • Electrochemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Optics & Photonics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)

Abstract

Dispositif d'affichage électrophorétique de type triode (10) comprenant une fenêtre de visualisation en verre (12) sur laquelle a été déposée une pluralité d'éléments de cathode parallèles (14). Une pluralité d'éléments de grille (16) reposent sur une couche isolante située au-dessus des éléments de cathode perpendiculairement par rapport auxdits éléments. Une enveloppe étanche aux fluides encapsulant la cathode et les éléments de grille (14 et 16) est constituée par une coiffe de verre (20) à couche conductrice déposée sur une surface intérieure pour former une anode. La coiffe de verre (20) forme une étanchéité en s'appuyant sur la fenêtre de visualisation (12). Un fluide électrophorétique contenant des particules pigmentées en suspension se trouve à l'intérieur de l'enveloppe. Les éléments de cathode et de grille (14 et 16) n'ont pas d'extrémités libres à l'intérieur du fluide, par contre, lesdites extrémités s'étendent au-delà de l'espace contenant le fluide et sont recouvertes par la coiffe (20). La cathode, la grille et l'anode (14, 16 et 20) peuvent sélectivement se charger électriquement pour induire le mouvement des particules à l'intérieur du fluide, et des concentrations de particules localisées aux intersections de la cathode et de la grille (14 et 16) sont visibles par la fenêtre de visualisation (12).
PCT/US1991/008131 1990-12-19 1991-11-07 Panneau d'affichage electrophoretique a capacite amelioree WO1992011625A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US63023890A 1990-12-19 1990-12-19
US630,238 1990-12-19

Publications (1)

Publication Number Publication Date
WO1992011625A1 true WO1992011625A1 (fr) 1992-07-09

Family

ID=24526365

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1991/008131 WO1992011625A1 (fr) 1990-12-19 1991-11-07 Panneau d'affichage electrophoretique a capacite amelioree

Country Status (1)

Country Link
WO (1) WO1992011625A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4742345A (en) * 1985-11-19 1988-05-03 Copytele, Inc. Electrophoretic display panel apparatus and methods therefor
US4840459A (en) * 1987-11-03 1989-06-20 General Electric Co. Matrix addressed flat panel liquid crystal display device with dual ended auxiliary repair lines for address line repair

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4742345A (en) * 1985-11-19 1988-05-03 Copytele, Inc. Electrophoretic display panel apparatus and methods therefor
US4840459A (en) * 1987-11-03 1989-06-20 General Electric Co. Matrix addressed flat panel liquid crystal display device with dual ended auxiliary repair lines for address line repair

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