WO2006103605A1 - Procede de fabrication d’un dispositif d’ecran electrophoretique et dispositif d’ecran electrophoretique - Google Patents

Procede de fabrication d’un dispositif d’ecran electrophoretique et dispositif d’ecran electrophoretique Download PDF

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Publication number
WO2006103605A1
WO2006103605A1 PCT/IB2006/050899 IB2006050899W WO2006103605A1 WO 2006103605 A1 WO2006103605 A1 WO 2006103605A1 IB 2006050899 W IB2006050899 W IB 2006050899W WO 2006103605 A1 WO2006103605 A1 WO 2006103605A1
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WIPO (PCT)
Prior art keywords
pixel
pixels
substrate
electrode
electrodes
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Application number
PCT/IB2006/050899
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English (en)
Inventor
Mark T. Johnson
Nigel D. Young
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Koninklijke Philips Electronics N.V.
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Application filed by Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2006103605A1 publication Critical patent/WO2006103605A1/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
    • 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
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • G02F1/134363—Electrodes characterised by their geometrical arrangement for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
    • 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
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/12—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 electrode
    • G02F2201/124—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 electrode interdigital

Definitions

  • the invention relates to a method of manufacturing an electrophoretic display device, the electrophoretic display device comprising: a plurality of pixels, each pixel encapsulating between pixel walls 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.
  • US Patent Application US-A 2003/0152849 discloses a method of manufacturing an electrophoretic display device or a liquid crystal display device.
  • the known electrophoretic display device comprises micro-capsules of well-defined shape, size and aspect ratio and the micro-capsules are filled with charged pigment particles dispersed in an optically contrasting dielectric solvent.
  • a roll-to-roll process and apparatus permits the display manufacture to be carried out continuously by a synchronized photo-lithographic process.
  • the synchronized roll-to-roll process and apparatus permits a pre-patterned photomask, formed as a continuous loop, to be rolled in a synchronized motion in close parallel alignment to a web which has been pre-coated with a radiation sensitive material, so as to maintain image alignment during exposure to a radiation source.
  • the radiation sensitive material may be a radiation curable material, in which the exposed and cured portions form the micro-capsule structure. Exposure of a selected subset of the micro-capsules via the photo-mask image permits selective re-opening, filling and sealing of the micro-capsule subset. Repetition with additional colors permits the continuous assembly of a multicolor electrophoretic display device.
  • a disadvantage of the known method is that the individual microcapsules are provided at locations where an electrode structure has already been provided.
  • the invention has for its object to eliminate the above disadvantage wholly or partly.
  • a first aspect of the invention provides a method of manufacturing an electrophoretic display device, the electrophoretic display device comprising: a plurality of pixels with a characteristic dimension d p , each pixel encapsulating between pixel walls an electrophoretic medium comprising a fluid and a plurality of charged electrophoretic particles dispersed in the fluid, each pixel being divided into a plurality of imaginary sub-pixels, the method comprising the steps of: arranging the plurality of pixels on a first substrate in a substantially regular two-dimensional manner, providing a plurality of common electrodes and a plurality of pixel electrodes on a second substrate in a substantially similar regular two-dimensional manner, assembling the first substrate and the second substrate, the common electrodes and the pixel electrodes on the second substrate facing the pixels on the first substrate, a pitch d ee of
  • the common electrode and the pixel electrodes are provided on the second substrate before the first and the second substrate are assembled.
  • the common electrode and the pixel electrodes are created after the first and the second substrate are assembled.
  • a second aspect of the invention provides a method of manufacturing an electrophoretic display device, the electrophoretic display device comprising: a plurality of pixels with a characteristic dimension d p , each pixel encapsulating between pixel walls an electrophoretic medium comprising a fluid and a plurality of charged electrophoretic particles dispersed in the fluid, each pixel being divided into a plurality of imaginary sub-pixels, the method comprising the steps of: arranging the plurality of pixels on a first substrate in a substantially regular two-dimensional manner, providing an electrode-preparation layer on a second substrate, assembling the first substrate and the second substrate, the electrode- preparation layer on the second substrate facing the pixels on the first substrate, exposing the electrode-preparation layer to patterned radiation forming a plurality of common electrodes and forming a plurality of pixel electrodes on the second substrate, a pitch d ee of the common electrodes and the characteristic dimension d p of the pixels meeting the relation:
  • each of the pixels comprises a plurality of common electrodes and a plurality of pixel electrodes.
  • the provision of a plurality of common electrodes and a plurality of pixel electrodes per pixel renders the resulting electrophoretic display device relatively insensitive to misalignment of the pixels.
  • Each of the imaginary sub-pixels comprises its own common electrode and its corresponding pixel electrode such that each imaginary sub-pixel has the functionality of the well-known in-plane switching concept for electrophoretic displays.
  • the common electrode and the corresponding pixel electrode of each sub-pixel determine the presence of a so-called reservoir region
  • the exact position of the imaginary sub-pixel with respect to the pixel walls is less important.
  • the location of the common electrodes and pixel electrodes with respect to the pixels determines the location of the imaginary sub-pixels.
  • the imaginary sub-pixels which are located relatively remote from the pixel walls will be fully operative.
  • an imaginary sub-pixels which is formed in the vicinity of a pixel wall will have an effective aperture that is somewhat reduced.
  • such an imaginary sub-pixel may contain a pixel wall.
  • the effectiveness of the imaginary sub-pixels in the vicinity of the pixel walls may be reduced, resulting in a reduced colorfulness of such imaginary sub-pixels.
  • such imaginary sub-pixel will still be operative.
  • the sub-pixels are defined by the electrode structures on the second substrate. In other words, the sub-pixels are aligned to the electrode structures on the second substrate.
  • the methods of manufacturing according to the invention avoid the provision of an electrode structure registering with the location of the pixels.
  • an alignment tolerant (in-plane) electrode pattern is realized.
  • a iavorable embodiment of the method of manufacturing an electrophoretic display device according to the second aspect of the invention is characterized in that: the electrode-preparation layer comprises conductive particles forming the common electrodes and the pixel electrodes during exposing the electrode-preparation layer to patterned radiation.
  • the electrode-preparation layer may contain a random distribution of conductive particles.
  • these conductive particles are selectively re-arranged forming continuous conducting films at the location where the electrode-preparation layer is exposed to the patterned radiation.
  • the exposure to patterned radiation comprises locally heating the electrode-preparation layer.
  • these conductive particles form continuous conducting films at the location where the electrode- preparation layer is exposed to the patterned radiation.
  • a iavorable embodiment of the method of manufacturing an electrophoretic display device is characterized in that: the electrode-preparation layer comprises conductive polymeric material forming the common electrodes and the pixel electrodes during exposing the electrode-preparation layer to patterned radiation.
  • the electrode-preparation layer may contain a conductive polymeric material such as PANI (poly-analine).
  • PANI poly-analine
  • the exposure to patterned radiation comprises locally exposing the electrode-preparation layer to ultra-violet radiation.
  • these intrinsically conductive polymeric films form non-conducting films at the location where the electrode-preparation layer is exposed to the patterned radiation.
  • the pixel walls can be used as a so-called self-align mask to avoid creating conducting films at the location of the pixel walls.
  • a favorable embodiment of the method of manufacturing an electrophoretic display device according to the second aspect of the invention is characterized in that: the pixel walls act as a shielding means during the exposure of the electrode-preparation layer to the patterned radiation for reducing the formation of the common electrodes and pixel electrodes in the electrode-preparation layer at the location of the pixel walls.
  • a further favorable embodiment of the method of manufacturing an electrophoretic display device according to the second aspect of the invention is characterized in that: the pixel walls act as a focusing means during the exposure of the electrode- preparation layer to the patterned radiation for reducing the electrical conductivity of the common electrodes and pixel electrodes in the electrode-preparation layer at the location of the pixel walls.
  • an alignment tolerant in-plane electrode pattern can be further improved by providing more common electrodes and pixel electrodes per pixel of the electrophoretic display device.
  • a method of manufacturing an electrophoretic display device according to the first or the second aspect of the invention is characterized in that: the pitch d ee of the common electrodes and the characteristic dimension d p of the pixels meet the relation:
  • a method of manufacturing an electrophoretic display device is characterized in that: a width w p of the pixel-walls and the pitch d ee of the common electrodes meet the relation: ⁇ ⁇ 1 .
  • the width w p of the pixel- walls and the pitch dp e of the pixel electrodes meet the relation: w -*- ⁇ 1 . d P e
  • An alternative favorable embodiment of the method of manufacturing an electrophoretic display device according to the first or the second aspect of the invention is characterized in that: the width w p of the pixel- walls and the characteristic dimension d p of the pixels meet the relation: w 0.005 ⁇ - ⁇ - ⁇ 0.1 . d p
  • the width w p of the pixel- walls and the characteristic dimension d p of the pixels meet the relation: w 0.02 ⁇ - ⁇ ⁇ 0.1 .
  • a third aspect of the invention provides 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 pixels with a characteristic dimension d p , the pixels being arranged in a substantially regular two-dimensional manner, each pixel encapsulating between pixel walls an electrophoretic medium comprising a fluid and a plurality of charged electrophoretic particles dispersed in the fluid, each pixel being divided into a plurality of imaginary sub-pixels, the second substrate being provided with a plurality of common electrodes and a plurality of pixel electrodes arranged in a substantially similar regular two-dimensional manner, the common electrodes and the pixel electrodes on the second substrate facing the pixels on the first substrate, a pitch d ee of the common electrodes and the characteristic dimension d p of the pixels meeting the relation: ⁇ - ⁇ 0.5 , d P and a pitch d pe of the pixel electrodes and the characteristic dimension d p of the pixels meeting
  • each of the pixels comprises a plurality of common electrodes and a plurality of pixel electrodes.
  • the provision of a plurality of common electrodes and a plurality of pixel electrodes per pixel renders the resulting electrophoretic display device relatively insensitive to misalignment of the pixels.
  • Each of the imaginary sub-pixels comprises its own set of a common electrode and an adjacent corresponding pixel electrode such that each imaginary sub-pixel has the functionality of the well-known in-plane switching concept for electrophoretic displays.
  • the common electrode and the corresponding pixel electrode of each sub-pixel determine the presence of the reservoir region and the so-called visible pixel region.
  • the exact position of the imaginary sub-pixel with respect to the pixel walls is less important.
  • the location of the common electrodes and pixel electrodes with respect to the pixels determines the location of the imaginary sub-pixels.
  • the imaginary sub-pixels which are located relatively remote from the pixel walls will be fully operative.
  • an imaginary sub-pixel which is formed in the vicinity of a pixel wall will have an effective aperture that is somewhat reduced.
  • such an imaginary sub-pixel may contain a pixel wall.
  • the effectiveness of the imaginary sub-pixels in the vicinity of the pixel walls may be reduced, resulting in a reduced colorfulness of such imaginary sub-pixels.
  • such imaginary sub-pixel will still be operative.
  • the sub-pixels are defined by the electrode structures on the second substrate. In other words, the sub-pixels are aligned to the electrode structures on the second substrate. The provision of an electrode structure at the location of the pixels is avoided. In the electrophoretic display device according to the third aspect of the invention an alignment tolerant (in-plane) electrode pattern is realized.
  • an electrophoretic display device is characterized in that: the pitch d ee of the common electrodes and the characteristic dimension d p of the pixels meet the relation:
  • an electrophoretic display device is characterized in that: a width Wp of the pixel- walls and the pitch d ee of the common electrodes meet the relation:
  • the width w p of the pixel- walls and the pitch dp e of the pixel electrodes meet the relation:
  • An alternative favorable embodiment of the electrophoretic display device is characterized in that: the width w p of the pixel- walls and the characteristic dimension d p of the pixels meet the relation:
  • the width w p of the pixel- walls and the characteristic dimension d p of the pixels meet the relation: w 0.02 ⁇ - ⁇ - ⁇ 0.1 . d,
  • a iavorable embodiment of the electrophoretic display device according to the third aspect of the invention is characterized in that: in each pixel the pixel electrodes are short-circuited. This simplifies the manufacture of the electrophoretic display device.
  • Yet another favorable embodiment of the electrophoretic display device according to the third aspect of the invention is characterized in that: the conductivity of a common electrode and/or a pixel electrode covered by a pixel wall is lower. This preferred embodiment can be realized when the second substrate comprised an electrode-preparation layer with conductive particles, which layer forms the common electrodes and the pixel electrodes during exposing the electrode-preparation layer to a patterned radiation.
  • Figure 1 is a cross-section of an embodiment of an electrophoretic display device according to the invention (side view), and
  • Figure 2 is a cross-section of an embodiment of an electrophoretic display device according to the invention (top view).
  • FIG. 1 very schematically shows a cross-section of an embodiment of an electrophoretic display device according to the invention (side view).
  • the electrophoretic display device comprises a plurality of pixels with a characteristic dimension d p (pitch).
  • the pixels are arranged in a substantially regular two-dimensional manner.
  • the characteristic dimension d p (pitch) corresponds to the length of each pixel in the two-dimensional arrangement.
  • Each pixel encapsulates an electrophoretic medium comprising a fluid 11 between pixel walls 5, the pixel walls having a width w p .
  • the fluid 11 has an electrically insulating character.
  • a plurality of charged electrophoretic particles 12 is dispersed.
  • Each pixel is divided into a plurality of imaginary sub-pixels 10, two of which are indicated in Figure 1.
  • the plurality of pixels is provided on a first substrate 1.
  • the side walls 5 and a seal layer 6 provide confinement of the fluid 11.
  • 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 the plurality of common electrodes 16.
  • a plurality of common electrodes 16 and a plurality of pixel electrodes 15 are provided on a second substrate 2.
  • the common electrodes 16 and the pixel electrodes 15 are provided in a substantially similar regular two-dimensional manner.
  • the common electrodes 16 and the pixel electrodes 15 on the second substrate 2 face the pixels on the first substrate 1.
  • 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.
  • ITO indium tin oxide
  • the first substrate 1 provided with the pixels is assembled by being contacted to the second substrate 2 with the common electrodes 16 and the pixel electrodes 15.
  • the assembly process is carried out using a lamination process.
  • each of the pixels comprises a plurality of common electrodes 16 and a plurality of pixel electrodes 15.
  • the provision of a plurality of common electrodes 16 and a plurality of pixel electrodes 15 per pixel renders the resulting electrophoretic display device relatively insensitive to misalignment of the pixels.
  • Each of the imaginary sub-pixels 10 comprises its own set of a common electrode 16 and an adjacent corresponding pixel electrode 15 such that each imaginary sub-pixel 10 has the functionality of the well-known in-plane switching concept for electrophoretic displays.
  • the common electrode 16 and the corresponding pixel electrode 15 of each sub-pixel 10 determine the presence of the reservoir region and the so-called visible pixel region.
  • the exact position of the imaginary sub-pixel 10 with respect to the pixel walls 5 is less important.
  • the location of the common electrodes 16 and pixel electrodes 15 with respect to the pixels determines the location of the imaginary sub- pixels 10 (also see Figure 2).
  • the imaginary sub-pixels 10 which are located relatively remote from the pixel walls 5 will be fully operative.
  • an imaginary sub-pixel 10 which is formed in the vicinity of a pixel wall 5 will have an effective aperture that is somewhat reduced.
  • such an imaginary sub-pixel 10 may contain a pixel wall 5.
  • the effectiveness of the imaginary sub-pixels 10 in the vicinity of the pixel walls 5 may be reduced, resulting in a reduced colorfulness of such imaginary sub- pixels 10.
  • such imaginary sub-pixel 10 will still be operative.
  • the sub-pixels 10 are defined by the electrode structures on the second substrate 2. In other words, the sub- pixels 10 are aligned to the electrode structures on the second substrate 2. The provision of an electrode structure at the location of the pixels is avoided. In the electrophoretic display device as shown in Figure 1 an alignment tolerant (in-plane) electrode pattern is realized.
  • a pitch d ee of the common electrodes 16 and the characteristic dimension d p of the pixels meet the relation: ⁇ s. ⁇ o.5 , d P and a pitch d pe of the pixel electrodes 15 and the characteristic dimension d p of the pixels meeting the relation:
  • the pitch d ee of the common electrodes 16 and the characteristic dimension d p of the pixels meet the relation:
  • a typical dimension d p of the pixels is approximately 300 micron, whereas a typical pitch d pe of the pixel electrodes 15 is approximately 50 micron.
  • a width w p of the pixel- walls 5 and the pitch d ee of the common electrodes 16 meet the relation:
  • the width w p of the pixel- walls 5 and the pitch d pe of the pixel electrodes 15 meet the relation: w
  • a typical width w p of the pixel walls 5 is approximately 20 micron, whereas a typical pitch d pe of the pixel electrodes 15 is approximately 50 micron.
  • the width w p of the pixel- walls 5 and the characteristic dimension dp of the pixels meet the relation: w 0.005 ⁇ - ⁇ - ⁇ 0.1 . d p
  • the width w p of the pixel- walls 5 and the characteristic dimension dp of the pixels meet the relation: w 0.02 ⁇ - ⁇ ⁇ 0.1 .
  • a typical dimension d p of the pixels is approximately 300 micron, whereas a typical width w p of the pixel walls 5 is approximately 20 micron.
  • a method of manufacturing an electrophoretic display device as shown in Figure 1 comprises the following steps.
  • the plurality of pixels with the pixel walls 5 and the seal layer 6 is arranged on the first substrate 1 in a substantially regular two-dimensional manner.
  • the plurality of common electrodes 16 and the plurality of pixel electrodes 15 are provided on the second substrate 2 in a substantially similar regular two-dimensional manner.
  • the first substrate 1 is assembled with the second substrate 2 such that the common electrodes 16 and the pixel electrodes 15 on the second substrate 2 face the pixels on the first substrate 1.
  • FIG. 2 schematically shows a cross-section of an embodiment of an electrophoretic display device according to the invention (top view).
  • Each pixel comprises a plurality of common electrodes 16 and a plurality of pixel electrodes 15.
  • the pixel electrodes 15 are short- circuited in each pixel.
  • all common electrodes 16 are short-circuited for the entire electrophoretic display device. The short-circuiting can also be established outside the pixel area.
  • a particular common electrode referenced 16A and a particular pixel electrode referenced 15A coincide with a pixel wall 5.
  • the conductivity of the particular common electrode 16A and the particular pixel electrode 15A covered by a pixel wall 5 is lower.
  • the particular common electrode 16A and the particular pixel electrode 15A are shown dashed in Figure 2 because in a method of manufacturing the electrophoretic display device according to the invention, the formation of such electrode structures can be avoided.
  • a method of manufacturing an electrophoretic display device as shown in Figure 2 comprises the following steps.
  • the plurality of pixels with the pixel walls 5 and the seal layer 6 is arranged on the first substrate 1 in a substantially regular two-dimensional manner.
  • the electrode-preparation layer is provided on the second substrate.
  • the electrode- preparation layer comprises conducting particles.
  • the first substrate and the second substrate 2 are laminated wherein the electrode-preparation layer on the second substrate 2 faces the pixels on the first substrate 1.
  • the electrode-preparation layer is exposed to patterned radiation forming a plurality of common electrodes 16 and forming a plurality of pixel electrodes 15 on the second substrate 2.
  • it may contain a random distribution of conductive particles, for instance aluminum particles.
  • conductive particles for instance aluminum particles.
  • these conductive particles are selectively re-arranged forming continuous conducting films at the location where the electrode-preparation layer is exposed to the patterned radiation.
  • a suitable manner of irradiation is the local locally heating the electrode-preparation layer.
  • the electrode-preparation layer By suitably heating the electrode-preparation layer, these conductive particles form continuous conducting films at the location where the electrode-preparation layer is exposed to the patterned radiation. If the common electrode 16 and the pixel electrodes 15 are created after assembling the first and the second substrate 1 ; 2 by suitably irradiating the electrode-preparation layer, the pixel walls can be used as a so-called self-align mask to avoid creating the particular common electrode 16A and the particular pixel electrode 15A are exemplified in Figure 2.
  • the invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer.
  • the device claim enumerating several means several of these means may be embodied by one and the same item of hardware.
  • the mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

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

Abstract

Un dispositif d’écran électrophorétique selon l’invention a un premier substrat (1) et un deuxième substrat (2). Le premier substrat est muni d’une pluralité de pixels. Chaque pixel encapsule entre les parois de pixel (5) un milieu électrophorétique comprenant un fluide (11) et une pluralité de particules électrophorétiques chargées (12) dispersées dans le fluide (11). Chaque pixel est divisé en une pluralité de sous pixels imaginaires (10). Le procédé de fabrication d’un dispositif d’écran électrophorétique comprend les étapes suivantes. Une pluralité de pixels électrophorétiques est logée sur le premier substrat d’une façon bidimensionnelle sensiblement régulière. Une pluralité d’électrodes communes (16) et d’électrodes pixel (15) sont logées sur le deuxième substrat. Le premier substrat et le deuxième substrat sont lamellés. Un pas dce des électrodes communes et une dimension caractéristique dp des pixels sont conformes à la relation: et un pas dpe des électrodes pixel et la dimension caractéristique dp sont conformes à la relation.
PCT/IB2006/050899 2005-04-01 2006-03-23 Procede de fabrication d’un dispositif d’ecran electrophoretique et dispositif d’ecran electrophoretique WO2006103605A1 (fr)

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EP05102576.5 2005-04-01
EP05102576 2005-04-01

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007029566A1 (de) 2007-06-26 2009-01-02 Bundesdruckerei Gmbh Verfahren zur Herstellung einer elektrophoretischen Anzeigevorrichtung, elektrophoretische Anzeigevorrichtung und Dokument
DE102007000881A1 (de) 2007-11-12 2009-05-14 Bundesdruckerei Gmbh Dokument mit einer integrierten Anzeigevorrichtung, Verfahren zur Herstellung eines Dokuments und Lesegerät
EP2245506A1 (fr) * 2008-02-26 2010-11-03 Hewlett-Packard Development Company, L.P. Dispositif d'affichage électrophorétique

Citations (5)

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