WO2006103604A1 - Procede de fabrication d'un ecran electrophoretique et ecran electrophoretique - Google Patents

Procede de fabrication d'un ecran electrophoretique et ecran electrophoretique Download PDF

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Publication number
WO2006103604A1
WO2006103604A1 PCT/IB2006/050897 IB2006050897W WO2006103604A1 WO 2006103604 A1 WO2006103604 A1 WO 2006103604A1 IB 2006050897 W IB2006050897 W IB 2006050897W WO 2006103604 A1 WO2006103604 A1 WO 2006103604A1
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WO
WIPO (PCT)
Prior art keywords
substrate
microcapsules
contact pads
manufacturing
microcapsule
Prior art date
Application number
PCT/IB2006/050897
Other languages
English (en)
Inventor
Alwin R. M. Verschueren
Mark T. Johnson
Nigel D. Young
Original Assignee
Koninklijke Philips Electronics N.V.
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 Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2006103604A1 publication Critical patent/WO2006103604A1/fr

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Classifications

    • 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

  • the invention relates to a method of manufacturing an electrophoretic display device including a plurality of microcapsules, each microcapsule encapsulating an electrophoretic medium comprising a fluid and a plurality of charged electrophoretic particles dispersed in the fluid.
  • the invention also relates to an electrophoretic display device.
  • Electrophoretic display devices are non-emissive devices based on the phenomenon of electrophoresis influencing charged particles suspended in a suspension fluid.
  • the suspension fluid is, for example, a liquid or a gas.
  • Electrophoretic display devices are based on light absorbing and/or reflecting electrophoretic particles moving under the influence of an electric field between electrodes provided on opposite substrates or at spatially-separated portions on a substrate at one side of a microcapsule.
  • the charged electrophoretic particles usually are black and white particles or colored particles. With these display devices, dark (colored) characters can be imaged on a light (colored) background, and vice versa.
  • Electrophoretic display devices are notably used in display devices taking over the function of paper and are often referred to as "electronic paper” or "paper white” applications such as, for example, electronic newspapers and electronic diaries.
  • Electrophoretic display devices can form the basis of a variety of applications where information may be displayed, for example in the form of information signs, public transport signs, advertising posters, pricing labels, billboards etc.
  • electrophoretic display devices may be used where a changing non- information surface is required, such as wallpaper with a changing pattern or color, in particular if the surface requires a paper like appearance.
  • electrophoretic display devices offer an advantageous performance including relatively low power consumption due to long-term image stability, relatively high white state reflectivity and contrast, and "paper- like" optics enhancing readability and legibility.
  • the optical performance of these reflective display devices makes them relatively insensitive to ambient lighting intensity and direction.
  • Electrophoretic display devices provide a viewing angle which is practically as wide as that of normal paper.
  • the performance of electrophoretic display devices is such that supplemental illumination solutions such as front lights are not required for many devices.
  • Optical materials based on micro-encapsulated electrophoretic ink have been successfully integrated with traditional amorphous-Si thin- film transistors (TFTs), on a glass substrate, amorphous-Si TFTs built on conformable steel foils or organic TFTs. Facile mechanical integration of the material to active matrices leads to substantial simplifications in their cell assembly process compared to that of liquid crystal display (LCD) devices.
  • TFTs amorphous-Si thin- film transistors
  • LCD liquid crystal display
  • monochrome electrophoretic display devices for example, a flexible plastic front sheet coated with indium tin oxide (ITO) and the electrophoretic medium is laminated directly to a thin- film transistor backplane. After lamination, an edge seal is applied around the perimeter of the display device. In principle, no polarizer films, alignment layers, rubbing processes, or spacers are required.
  • the modulating layer includes a first substrate and an electro-optical material, for example an electrophoretic material, provided adjacent the first substrate.
  • the modulating layer is capable of changing a visual state upon application of an electric field.
  • the pixel layer comprises a second substrate.
  • a plurality of pixel electrodes are provided on a front surface of the second substrate and a plurality of contact pads are provided on a rear surface of the second substrate. Each pixel electrode is connected to a contact pad extending through the second substrate.
  • the circuit layer includes a third substrate and at least one circuit element. The modulating layer, the pixel layer, and the circuit layer are integrated to form the electro- optical device.
  • a disadvantage of the known method of manufacturing is that the alignment between the various layers is not optimal. This may result in some microcapsules being non- operational.
  • the invention has for its object to eliminate the above disadvantage wholly or partly. According to a first aspect of the invention, this object is achieved by a method of manufacturing an electrophoretic display device, the electrophoretic display device including a plurality of microcapsules, each microcapsule encapsulating an electrophoretic medium comprising a fluid (11) and a plurality of charged electrophoretic particles dispersed in the fluid, the method comprising the steps of: arranging the plurality of microcapsules on a first substrate in a substantially regular two-dimensional manner, providing a common electrode on the microcapsules at a side of the microcapsules facing away from the first substrate, the common electrode being arranged along a first direction, providing a pixel electrode on each microcapsule at a side of said microcapsule facing away from the first substrate, the pixel electrode being arranged along the first direction, providing a plurality of contact pads
  • each microcapsule on the first substrate is provided with a pixel electrode and with a common electrode.
  • On the second substrate a plurality of contact pads is provided. Electrical contact between the pixel electrode of each microcapsule and a particular one of the plurality of contact pads on the second substrate is established by contacting the first substrate with the second substrate.
  • the first and the second substrate upon contacting are oriented such that the pixel electrode on each microcapsule is oriented substantially perpendicular with respect to the contact pads. This is achieved by arranging the pixel electrode on each microcapsule along a first direction and the contact pads on the second substrate along a second direction while, upon contacting the first and the second substrate, the first direction and the second direction are oriented substantially perpendicular with respect to each other.
  • the mating tolerance between the structures providing electrical contact between the first and the second substrate is increased.
  • the tolerance is of the order of the size of the width of one electrode.
  • the alignment tolerance is increased to about the characteristic dimension of a single microcapsule. In practice this means a five to ten times improvement of tolerance, up to a realistic level of several 100 microns alignment accuracy.
  • the effect of the aligning the first and the second substrate according to the measure of the invention is particularly effective for full-color electrophoretic display devices relying upon in-plane ("horizontal") motion of electrophoretic particles.
  • in-plane horizontal
  • the electrophoretic particles are moving in a "vertical” manner from a position close to the first substrate towards the second substrate and vice versa.
  • in-plane in-plane
  • the second substrate is a so-called active matrix substrate.
  • a switching transistor for example a TFT transistor, is provided on the second substrate, the switching transistor being connected to the contact pad on the second substrate.
  • a preferred embodiment of the method of manufacturing according to the first aspect of the invention is characterized in that an isolating layer is provided on the common electrode at a side facing away form the first substrate.
  • the isolating layer on the common electrode reduces the possibility of electrical contact between the common electrode and the contact pads which contact is not desirable.
  • the isolation layer covers only the common electrode.
  • the isolation layer may cover a larger area than the common electrode but, preferably, not the pixel electrodes.
  • the common electrodes are short circuited for all microcapsules. Connection of the common electrodes to the second substrate can take place on the periphery of the electrophoretic display device.
  • first substrate is a relatively flexible substrate and the second substrate is a relatively rigid substrate.
  • a flexible first substrate can be easily contacted to the rigid second substrate using, for example, lamination techniques.
  • the relatively flexible first substrate comprises, for instance, a foil, preferably, a thin plastic film.
  • the relatively rigid second substrate comprises, for instance, a glass plate.
  • the method further comprises the steps of: contacting one side of the first substrate to one side of the second substrate, such that a row of the microcapsules on the first substrate is substantially aligned with a row of pixel electrodes at said one side of the second substrate, rolling the first substrate across the second substrate starting from said one side of the second substrate.
  • the relatively flexible first substrate with microcapsules provided with a common electrode and with a pixel electrode is laminated in a relatively easy manner on the relatively rigid second substrate with the pixel electrode structure.
  • the alignment procedure is carried out using traditional optical alignment techniques.
  • the relatively flexible first substrate with the array of microcapsules provided with the electrode structure is rolled across the relatively rigid second substrate with the electrode structure starting from the one side of the relatively rigid second substrate in such a manner that electrical contact between the pixel electrode of each microcapsule and the corresponding contact pad on the second substrate is established with a relatively high alignment tolerance.
  • a iavorable embodiment of the method of manufacturing an electrophoretic display device is characterized in that, before contacting the first substrate with the second substrate, a conductive adhesion material is applied on each of the pixel electrodes or on the plurality of contact pads for providing the electrical contact between the pixel electrode and the particular one of the plurality of contact pads.
  • the conductive adhesion material is applied by printing it on or by simply stamping the electrodes or contacts pads protruding with respect to the respective substrate on a glue pad.
  • an anisotropic glue layer provides the electrical contact between the pixel electrode on each microcapsule and the particular one of the plurality of contact pads.
  • the advantage of this embodiment is that the anisotropic glue can be deposited on the complete substrate without structuring.
  • the technique of applying an anisotropic glue layer is known in the art. In this technique conducting spacers, with a typical size of 5 micron, in an insulating epoxy matrix are squeezed together, such that conduction only takes place in the vertical direction.
  • the alignment tolerance of the mating first and second substrate can be increased to about the characteristic dimension of a single microcapsule.
  • a preferred embodiment of the method of manufacturing according to the first aspect of the invention is characterized in that a dimension da- st of the contact pads along the first direction and a separation S& st between the pixel electrodes measured along the first direction meet the relation: dfirst ⁇ Sfirst-
  • a further preferred embodiment of the method of manufacturing according to the first aspect of the invention is characterized in that a dimension d seCo n d of the contact pads along the second direction and a separation S seCo n d between the pixel electrodes measured along the second direction meet the relation:
  • the dimensions of the pixel electrodes can be chosen such to maximize the optical operation of the electrophoretic display and the dimensions of the contact pads can be chosen such to avoid that one contact pad establishes a short circuit between two (adjacent) pixel electrodes or that one pixel electrode establishes a short circuit between two (adjacent) contact pads.
  • an electrophoretic display device comprising: a first substrate and a second substrate, the first substrate being assembled with the second substrate, the first substrate being provided with a plurality of microcapsules, each microcapsule encapsulating an electrophoretic medium comprising a fluid and a plurality of charged electrophoretic particles dispersed in the fluid, the plurality of microcapsules being arranged on a first substrate in a substantially regular two-dimensional manner, a common electrode being provided on the microcapsules at a side of the microcapsules facing away from the first substrate, the common electrode being arranged along a first direction, a pixel electrode being provided on each microcapsule at a side of said microcapsule facing away from the first substrate, the pixel electrode being arranged along the first direction, the second substrate being provided with a plurality of contact pads in a substantially similar regular two-dimensional manner, the contact pads being arranged along a second direction, the first direction and the second direction being oriented substantially perpen
  • each microcapsule on the first substrate is provided with a pixel electrode and with a common electrode whereas a plurality of contact pads is provided on the second substrate. Electrical contact between the pixel electrode of each microcapsule and a particular one of the plurality of contact pads on the second substrate is established by contacting the first substrate with the second substrate.
  • the first and the second substrate are oriented such that the pixel electrode on each microcapsule is oriented substantially perpendicular with respect to the contact pads.
  • the pixel electrode on each microcapsule is arranged along a first direction and the contact pads on the second substrate along a second direction while the first direction and the second direction are oriented substantially perpendicular with respect to each other.
  • a relatively high alignment tolerance between each contact pad on the second substrate and the corresponding pixel electrode on the microcapsule on the first substrate is achieved.
  • the mating tolerance between the structures providing electrical contact between the first and the second substrate is increased.
  • the alignment tolerance is increased to about the characteristic dimension of a single microcapsule. In practice this means a five to ten times improvement of tolerance, up to a realistic level of several 100 microns alignment accuracy.
  • the common electrodes are short-circuited for all microcapsules. This simplifies the manufacture of the electrophoretic display device.
  • the second substrate is an active matrix substrate.
  • a switching transistor for example a TFT transistor, is provided on the second substrate, the switching transistor being connected to the contact pad on the second substrate.
  • the dimensions of the electrophoretic display device are relatively small thereby obtaining an image on the display device with a relatively high resolution.
  • a preferred embodiment of the electrophoretic display device according to the invention is characterized in that a characteristic dimension of the microcapsules is between 10 and 5000 micron.
  • Figure IA is a cross-section of a first embodiment of an electrophoretic display device according to the invention (side view);
  • Figure IB is a cross-section of a detail (top view) of the embodiment shown in Figure IA;
  • Figure 2A shows a first substrate provided with microcapsules and the arrangement of pixel electrodes and (isolated) common electrodes according to a second embodiment of the invention
  • Figure 2B shows a second substrate provided with contact pads and switching transistors according to the second embodiment of the invention
  • Figure 2C shows an assembly of the first substrate provided with microcapsules, the arrangement of pixel electrodes and (isolated) common electrodes and the second substrate provided with contact pads and switching transistors according to the second embodiment of the invention
  • Figure 3 A shows the first substrate provided with microcapsules and the arrangement of pixel electrodes and (isolated) common electrodes according to a third embodiment of the invention.
  • Figure 3B shows the second substrate provided with contact pads and switching transistors according to the third embodiment of the invention.
  • FIG. IA very schematically shows a cross-section of a first embodiment of an electrophoretic display device according to the invention (side view).
  • the electrophoretic display device comprises a plurality of microcapsules 10, two of which are exemplified in Figure IA.
  • Each of the microcapsules 10 encapsulates an electrophoretic medium comprising a fluid 11 and a plurality of charged electrophoretic particles 12 dispersed in the fluid 11.
  • the fluid 11 has an electrically insulating character.
  • Side walls 5 arranged perpendicular to the first substrate 1 and a seal layer 6 provide confinement of the fluid 11 with the charged electrophoretic particles 12 in the microcapsules 10.
  • a known technology for creating the microcapsules 12 on a substrate is the so-called embossing technology.
  • a common electrode 16 is provided on each microcapsules 10 at a side of the microcapsules 10 facing away from the first substrate 1.
  • the common electrode 16 is arranged along a first direction 30 (see Figure IB; in Figure IA the first direction is perpendicular with respect to the drawing plane).
  • an isolating layer 26 is provided on the common electrode 16 at a side facing away form the first substrate 1.
  • the isolating layer 26 covers only the common electrode 16.
  • the isolating layer 26 covers a larger part of the pixel area. At maximum the isolating layer 26 covers the complete pixel area except for the pixel electrode 15 to be contacted with the contact pad 17.
  • An isolating layer covering a larger area than only area of the common electrode is beneficial because the stray- fields originating from the contact pad are reduced.
  • the common electrodes 16 are short circuited for all microcapsules 10.
  • connection of the common electrodes 16 to the second substrate 2 is provided on the periphery of the electrophoretic display device.
  • a pixel electrode 15 is provided on each microcapsule 10 (see Figure IB) at a side of said microcapsule 10 facing away from the first substrate 1.
  • the pixel electrode 15 is arranged substantially parallel to the common electrode 16.
  • Electrophoretic display devices are based on light absorbing and/or reflecting electrophoretic particles 12 moving under the influence of an electric field.
  • the charged electrophoretic particles 12 usually are colored particles or black and white particles.
  • the charged electrophoretic particles 12 are attracted towards one of the walls 5; in the right part of Figure IB, the charged electrophoretic particles 12 are evenly spread along the seal layer 6.
  • the electrophoretic particles 12 are moving in a "horizontal" manner. This manner of movement is typical for a full-color electrophoretic display device.
  • a further common electrode 9 is provided on the first substrate 1; this further common electrode 9 is optional.
  • the pixel electrodes 15 and the common electrodes 16 are made from indium tin oxide (ITO) or any other suitable transparent conductive material.
  • the charged electrophoretic particles are attracted towards the pixel electrode in one mode of operation whereas in another mode of operation the charged electrophoretic particles are attracted towards the further common electrode arranged on the first substrate.
  • the electrophoretic particles are moving in a "vertical" manner. This manner of movement is typical for a monochrome electrophoretic display device.
  • the pixel electrode is a flat, rectangular shaped electrode, with a smaller conducting portion protruding below the electrode which would connect to the contact pad.
  • the plurality of microcapsules 10 is arranged on the first substrate 1 in a substantially regular two-dimensional manner (see Figure 2 A; in Figure IA only one dimension is shown).
  • the first substrate 1 comprises a foil, for example, a thin plastic film with a typical thickness of 100 ⁇ m.
  • a characteristic dimension d mc of the microcapsules is between 10 and 5000 micron.
  • the characteristic dimension of the microcapsules is between 50 and 500 micron.
  • a plurality of contact pads 17 is provided on a second substrate 2.
  • the contact pads 17 are arranged along a second direction 40.
  • the first direction 30 (see Figure IB) and the second direction 40 are substantially perpendicular with respect to each other.
  • the plurality of contact pads 17 provided on the second substrate 2 is arranged in a regular two-dimensional manner which is substantially similar tot the regular two- dimensional manner in which the microcapsules with the pixel electrode are arranged.
  • the first substrate 1 is brought into contact with the second substrate 2 such that electrical contact is provided between the pixel electrode 15 of each microcapsule 10 and a particular one of the plurality of contact pads 17 on the second substrate 2.
  • an anisotropic glue layer 25 provides electrical contact between the pixel electrode 15 of each microcapsule 10 and the particular one of the plurality of contact pads 17.
  • the technique of applying an anisotropic glue layer is known in the art. In this technique conducting spacers, with a typical size of 5 micron, in an insulating epoxy matrix are squeezed together, such that conduction only takes place in the vertical direction.
  • Figure IB very schematically shows a cross-section of a detail (top view) of the embodiment shown in Figure IA.
  • the common electrode 16 is arranged along a first direction 30; the first direction 30 is substantially perpendicular to the second direction 40 in Figure IA.
  • the isolating layer 26 covers the common electrode 16.
  • the pixel electrode 15 is arranged substantially along to the first direction 20.
  • Figure 2A very schematically shows the first substrate 1 provided with a two- dimensional array of microcapsules with side walls 5 and the arrangement of pixel electrodes 15 and common electrodes 16 covered by an isolation layer 26 according to a second embodiment of the invention.
  • the isolation layer 26 covers a larger area than the common electrode 16.
  • separations S& st and S seCo n d between the pixel electrodes along the first direction 30 and the second direction 40, respectively, have been indicated.
  • Figure 2B very schematically shows the second substrate 2 provided with a two-dimensional array of contact pads 17 and (TFT) switching transistors 27 according to the second embodiment of the invention.
  • the contact pads 17 are arranged along the second direction 40.
  • the dimension dfir st of the contact pads 17 along the first direction 30 and the separation Sa- st between the pixel electrodes 15 measured along the first direction 30 meet the relation: dfirst ⁇ Sfirst-
  • the dimension d seco n d of the contact pads 17 along the second direction 40 and a separation S seCo n d between the pixel electrodes 15 measured along the second direction 40 meet the relation:
  • the dimensions of the pixel electrodes 15 are chosen such to maximize the optical operation of the electrophoretic display.
  • the dimensions of the contact pads 17 are chosen according to the above indicated relations to avoid that one contact pad 17 establishes a short circuit between two (adjacent) pixel electrodes 15 or that one pixel electrode 15 establishes a short circuit between two (adjacent) contact pads 17.
  • the periodicity of the pixel electrodes 15 corresponds to the periodicity of the contact pads 17.
  • the dimensions (d&-s t , dsecond) of the contact pads 17 are not chosen to be smaller than the dimensions of the pixel electrodes 15, but are chose to be smaller than the separation (Sa- st , S seCo n d ) between neighboring pixel electrodes 15. This avoids short circuits between neighboring pixel electrodes 15 and contact pads 17.
  • Figure 2C very schematically shows an assembly of the first substrate 1 provided with microcapsules, the arrangement of pixel electrodes 15 and (isolated) common electrodes 16 and the second substrate 2 provided with contact pads 17 and switching transistors 27 according to the second embodiment of the invention.
  • the freedom of alignment the first substrate 1 with respect to the second substrate 2 is schematically indicated with the arrow m 30 for the first direction 30 and with the arrow Hi 40 for the second direction 40.
  • the alignment tolerance m 30 ; ITJ 40 between the structures providing electrical contact between the first substrate 1 and the second substrate 2 is largely increased.
  • the alignment tolerance m 30 ; IrJ 40 is increased to about the characteristic dimension of a single microcapsule.
  • the dimensions of the contacting structures on each of the substrates 1; 2 are chosen such that a one-to-one electrical relationship between the pixel electrode 15 of each microcapsule on the first substrate 1 and a particular one of the plurality of contact pads 17 on the second substrate 2 is established.
  • the method of manufacturing an electrophoretic display device further comprises: contacting one side of the first substrate 1 to one side of the second substrate 2, such that a row of the microcapsules 10 on the first substrate 1 is substantially aligned with a row of pixel electrodes 15 at said one side of the second substrate 2, and rolling the first substrate 1 across the second substrate 2 starting from said one side of the second substrate 2.
  • Figure 3 A very schematically shows the first substrate 1 provided with R, G, B microcapsules and the arrangement of pixel electrodes 15 and common electrodes 16 provided with an isolation layer 26 according to a third embodiment of the invention.
  • Figure 3B very schematically shows the second substrate 2 provided with contact pads 17 and switching transistors 27 according to the third embodiment of the invention.
  • the two substrates are overlaid in a manner similar to the situation shown in Figure 2C such that a one-to-one electrical relationship between the pixel electrode 15 of each R, G, B microcapsule on the first substrate 1 and a particular one of the plurality of contact pads 17 on the second substrate 2 is established.
  • the mating procedure can be done by positioning one row of microcapsules provided with pixel electrodes 15 onto one row of contact pads 17 on the second substrate 2 and consequently sliding a pressure squeegee over the remaining rows. Because this sliding process can stretch the relatively flexible first substrate 1, it is beneficial to perform this in a direction where the electrophoretic microcapsules are identical. Stretching of the relatively flexible first substrate 1 in the direction where the microcapsules are identical will only result in some skipped lines, which is much less disturbing to the image quality than colour intermixing.
  • the process of laminating an electrophoretic foil (first substrate) on top an active matrix backplane (second substrate) with an in-plane electrode structure requires a relatively high alignment accuracy and rigidity of the electrophoretic foil (first substrate).
  • this problem is solved by depositing the pixel electrodes and the (isolated) common electrodes directly on top of the electrophoretic microcapsules on the first substrate and employing contact pads on the active matrix backplane (second substrate). This results in an enhanced alignment tolerance which, according to the invention, becomes practically as large as the size of the width of the pixels.

Abstract

Le procédé de fabrication d'un écran électrophorétique consiste à: disposer une pluralité de microcapsules (10) sur un premier substrat (1) de manière bidimensionnelle et sensiblement régulière; apporter une électrode de pixel (15) et une électrode classique (16) sur chaque microcapsule; apporter une pluralité de plots de connexion (17) sur un substrat (2) d'une manière semblable bidimensionnelle et sensiblement régulière; mettre en contact le premier substrat avec le second substrat assurant un contact électrique entre l'électrode de pixel de chaque micro-capsule et un plot particulier parmi la pluralité de plots de connexion sur le second substrat, tout en orientant les électrodes de pixel et les plots de connexion de manière sensiblement perpendiculaire les uns par rapport aux autres. On prévoit une couche d'isolation (26), de préférence, sur l'électrode classique s'éloignant du premier substrat. On obtient ainsi une tolérance à alignement relativement élevé entre les plots de contact sur le second substrat et l'électrode de pixel sur le premier substrat.
PCT/IB2006/050897 2005-04-01 2006-03-23 Procede de fabrication d'un ecran electrophoretique et ecran electrophoretique WO2006103604A1 (fr)

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EP05102579 2005-04-01

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Cited By (1)

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US9201282B2 (en) 2009-07-27 2015-12-01 Hj Forever Patents B.V. Electrophoretic display device

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TWI420216B (zh) * 2010-05-05 2013-12-21 Long Win Science And Technology Corp Production method of color chamber unit for display of particle type electronic paper display panel

Citations (1)

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EP1149325B1 (fr) * 1998-12-15 2003-02-05 E Ink Corporation Ensemble d'affichage electronique microencapsule

Patent Citations (1)

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EP1149325B1 (fr) * 1998-12-15 2003-02-05 E Ink Corporation Ensemble d'affichage electronique microencapsule

Non-Patent Citations (1)

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TOYAMA J ET AL SOCIETY FOR INFORMATION DISPLAY: "AN ELECTROPHORETIC MATRIX DISPLAY WITH EXTERNAL LOGIC AND DRIVER DIRECTLY ASSEMBLED TO THE PANEL", SID INTERNATIONAL SYMPOSIUM DIGEST OF TECHNICAL PAPERS. SAN JOSE, JUNE 14 - 16, 1994, SANTA ANA, SID, US, vol. VOL. 25, 14 June 1994 (1994-06-14), pages 588 - 590, XP000462732 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9201282B2 (en) 2009-07-27 2015-12-01 Hj Forever Patents B.V. Electrophoretic display device

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