WO2006016301A1 - Afficheur électrophorétique - Google Patents

Afficheur électrophorétique Download PDF

Info

Publication number
WO2006016301A1
WO2006016301A1 PCT/IB2005/052487 IB2005052487W WO2006016301A1 WO 2006016301 A1 WO2006016301 A1 WO 2006016301A1 IB 2005052487 W IB2005052487 W IB 2005052487W WO 2006016301 A1 WO2006016301 A1 WO 2006016301A1
Authority
WO
WIPO (PCT)
Prior art keywords
reset
electrode
particles
display
volume
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.)
Ceased
Application number
PCT/IB2005/052487
Other languages
English (en)
Inventor
Lucas J. M. Schlangen
Mark T. Johnson
Patrick J. Baesjou
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
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 NV filed Critical Koninklijke Philips Electronics NV
Publication of WO2006016301A1 publication Critical patent/WO2006016301A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • G09G3/3446—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 with more than two electrodes controlling the modulating element
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0439—Pixel structures
    • G09G2300/0452—Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/06—Details of flat display driving waveforms
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/06—Details of flat display driving waveforms
    • G09G2310/061—Details of flat display driving waveforms for resetting or blanking
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0252—Improving the response speed

Definitions

  • the invention relates to a driver for an electrophoretic display, the electrophoretic display, a display apparatus comprising the electrophoretic display, and a method of driving the electrophoretic display.
  • each pixel comprises at least two sub-pixels, and each sub-pixel is provided with a color filter and contains an electrophoretic media comprising two oppositely charged particle types.
  • each pixel comprises three sub-pixels having a cyan, magenta, and yellow absorbing filter, respectively.
  • a single sub-pixel comprises two reservoirs, one for each particle species, separated by a visible pixel volume.
  • the reservoirs comprise data electrodes, a reset electrode for negatively charged particles, and a reset electrode for positively charged particles.
  • the data electrodes may be connected via thin film transistors (TFT' s) to data drivers in an active matrix, while the reset electrodes may be common electrodes for a plurality of pixels or even for the entire display.
  • a black matrix covers the reservoirs to hide them for the viewer.
  • the pixel further comprises a white reflective background. Barriers forming sub-pixel walls may separate the sub-pixels from each other.
  • the brightness of this reflective display could be enhanced by using a front light assembly.
  • the inventive display is transmissive, instead of white reflectors, the display is fitted with a backlight which comprises, for example, a light guide and a light source.
  • the sub-pixels are filled with the corresponding electrophoretic solutions, which comprise the correctly colored and charged particles, into individual sub-pixel areas, each of which is surrounded by a pixel wall structure.
  • the perceived color of the pixel is determined by the number of visible particles of each color type which are present in each sub-pixel volume. If no particles are present, the sub-pixel takes the color of its color filter. If all particles are present, the sub-pixel becomes black. Other colors are achieved by providing intermediate numbers of the respective particles.
  • a first aspect of the invention provides a driver for an electrophoretic display as claimed in claim 1.
  • a second aspect of the invention provides an electrophoretic display as claimed in claim 2.
  • a third aspect of the invention provides a display apparatus comprising the electrophoretic display as claimed in claim 8.
  • a fourth aspect of the invention provides a method of driving the electrophoretic display as claimed in claim 9.
  • the electrophoretic display in accordance with the second aspect of the invention comprises display cells which each comprise first particles and second particles having different optical properties and being oppositely charged.
  • a first reset electrode and a second reset electrode are associated with a reservoir volume.
  • a first data electrode and a second data electrode are associated with a display volume which is adjacent to the reservoir volume.
  • a reset driver supplies a reset voltage between the first reset electrode and the second reset electrode.
  • a display driver supplies a drive voltage between the first data electrode and the second data electrode.
  • a controller controls the reset driver and the display driver to obtain the following sequence of states of the display cells:
  • a first fill state wherein the reset voltage has a first polarity, further referred to as the first reset polarity, to attract the first particles to the first reset electrode and the second particles to the second reset electrode.
  • the drive voltage has a first polarity, further referred to as the first drive polarity.
  • the drive voltage has a level with respect to the reset voltage to attract the first particles towards part of the display volume adjacent to the first data electrode, and to prevent the second particles to move between the reservoir volume and the display volume.
  • the amount of particles which move from the reservoir volume to the display volume depends on both the voltage difference between the second reset electrode and the second data electrode and the time this voltage difference is present.
  • the present invention differs from the non-prc-publishcd prior art in that the positive and negative particles are present in a single reservoir volume, in that the data electrodes are associated with the display volume which is adjacent to the reservoir volume and in that a polarity reversal drive is used. This results in a more efficient display because less space is required by the single reservoir volume.
  • the group of display cells which is associated with the interconnected first reset electrodes, the second reset electrodes, and the second data electrodes, respectively, only require, per display cell, individual driving of the first data electrode.
  • a single drive transistor usually a TFT (Thin Film Transistor), which is coupled to the first data electrode, is required for each display cell.
  • TFT Thin Film Transistor
  • the reservoir volume and the display volume are arranged in line. Now, the particles can move efficiently in a short path between the reservoir volume and the display volume.
  • the display cells further comprise help electrodes which facilitate the movement of the particles between the reservoir volume and the display volume and/or in the display volume.
  • the positive charged particles are attracted towards the second reset electrode and the negative charged particles are attracted towards the first reset electrode.
  • the positive voltage on the first reset electrodes keeps the negative particles in the reservoir volume. There is no electrical field which allows the positive particles to leave the reservoir volume.
  • the voltages on the first reset electrode, the second reset electrode and the second data electrode are not changed, only the voltage on the first data electrode is changed.
  • the negative particles near the first reset electrode are attracted towards the display volume near the first data electrode due to the voltage on the first data electrode which is more positive than the voltage on the first reset electrode.
  • the positive particles do not move between the reservoir volume and the display volume because there is no voltage difference between the second reset electrode and the second data electrode.
  • the voltage on the second reset electrode and the second data electrode are not changed.
  • the voltage on the first reset electrode and the first data electrode both get the same negative voltage.
  • the positive particles are attracted towards the first reset electrode and the negative particles are attracted towards the second reset electrode and thus swap position.
  • the negative particles move from the first data electrode to the second data electrode.
  • the voltages on the first reset electrode, the second reset electrode and the second data electrode are not changed, the voltage on the first data electrode is now made more negative than the voltage on the first reset electrode and the positive particles move from the reservoir volume to the display volume.
  • the negative particles will not move between the reservoir volume and the display volume because the voltage between the second reset electrode and the second data electrode is zero.
  • the voltages on the first reset electrode, the second reset electrode, and the second data electrode can be identical for all display cells.
  • the amount of particles which move between the reservoir volume and the display volume during the first and the second fill states only depend on the voltage on the first data electrode (and the duration this voltage is present). It thus suffices to control only the first data electrode of each pixel separately, and thus only one TFT per display cell is required.
  • Fig. 1 shows schematically a cross-section of a display cell, and its driver
  • Fig. 2 shows schematically an electrophoretic display comprising multiple display cells
  • Figs. 3A- 3E show schematically an embodiment of the voltages on the electrodes of the display cell to obtain the different optical states of the display cell
  • Figs. 4A - 4E show schematically another embodiment of the voltages on the electrodes of the display cell to obtain the different optical states of the display cell
  • Figs. 5A - 5B show schematically an embodiment of a display cell which comprises help electrodes
  • Fig. 6 shows an embodiment of an electrode configuration on the bottom substrate of the display cell.
  • Fig. 1 shows schematically a cross-section of a display cell, and its driver.
  • the display cell 10 comprises a reservoir volume RV and a display volume DV.
  • the reservoir volume RV is present between an opposing first reset electrode REl and a second reset electrode RE2.
  • the display volume DV is present between an opposing first data electrode DEl and a second data electrode DE2.
  • a reset driver 3 supplies a reset voltage VR between the first reset electrode REl and the second reset electrode RE2.
  • the data driver 4 supplies a data voltage VD between the first data electrode DEl and the second data electrode DE2.
  • a controller 5 controls the reset driver 3 and the data driver 4 to supply the reset voltage VR and the data voltage VD with the desired voltage levels during the desired periods in time to change the optical state of the display cell 10.
  • the number of particles 1 and 2 present in the reservoir volume RV has either a minor or no influence on the color of the display cell 10.
  • the reservoir volume RV is shielded from the viewer.
  • the number of particles 1 and 2 present in the display volume DV determines the perceived color of the display cell 10.
  • the optical state of the display cell 10 is determined by the distribution of the particles 1 and 2 which are oppositely charged and have different optical properties.
  • the particles 1 may be positively charged and the particles 2 may be negatively charged as shown in Fig. 1.
  • the positively charged particles 1 may absorb red light and the negatively charged particles 2 may absorb green light.
  • the light impinging on the display cell 10 may pass the cell or may be reflected by a reflector at the side of the cell opposite to the side where the light impinges.
  • a color filter (not shown) may be present to filter the light, either in the form of a color filter element, or alternatively incorporated into the display cell in the form of a colored liquid or a colored reflector.
  • Embodiments of operation of the display cell 10 will be elucidated with respect to Figs. 3A - 3E and 4A - 4E.
  • Fig. 2 shows schematically an electrophoretic display 100 comprising multiple display cells 10.
  • the display cells 10 are arranged in a matrix as well known in the art.
  • the processing circuit 101 receives a data signal RVS and supplies a display video signal DVS suitable for the display 100.
  • the received data signal RVS may be an analog or digital signal
  • the display video signal DVS is a digital signal which is fed to the controller 5 (shown in Figs. 5A — 5B) to control the reset driver 3 and the data driver 4 to obtain an optical state of the display cells 10 for representing the image(s) of the data signal RVS.
  • Figs. 3 A - 3E show schematically an embodiment of the voltages on the electrodes of the display cell to obtain the different optical states of the display cell.
  • the same items as in Fig. 1 have the same references.
  • a black mask BM is added to shield the reset volume RV from the viewer.
  • Fig. 3A shows the first part of the reset state wherein the voltage on the first reset electrode REl, the first data electrode DEl, and the second data electrode DE2 are OV, and the voltage on the second reset electrode RE2 is -10V.
  • the positive particles 1 are attracted towards the second reset electrode RE2 by the negative voltage -10V on the second reset electrode RE2.
  • the negative particles 2 will stay in the display volume DV because no electric field exists which attracts these particles 2 towards the reset volume RV.
  • the voltages applied to the electrodes may deviate from the voltages shown. What counts is that an electric field is generated which attracts the positive particles 1 towards the reset volume RV and which leaves the negative particles 2 in the display volume DV.
  • the voltage on the first reset electrode REl may be negative with respect to the first data electrode DEl, or the second data electrode DE2 may be negative with respect to the first data electrode DEL
  • Fig. 3B shows the second part of the reset state wherein the voltage on the second reset electrode RE2, the first data electrode DEl, and the second data electrode DE2 are OV, and the voltage on the first reset electrode REl is +10V.
  • the negative particles 2 are attracted towards the first reset electrode REl by the positive voltage +10V on the first reset electrode REl.
  • the positive particles 1 will stay in the reset volume RV because no electric field exists which attracts these particles 1 towards the display volume DV. Again, the voltages applied to the electrodes may deviate from the voltages shown. What counts is that an electric field is generated which attracts the negative particles 2 towards the reset volume RV and which leaves the positive particles 1 in the reset volume RV.
  • the voltage on the second data electrode DE2 may be positive with respect to the first data electrode DEl but should be less positive than the voltage +10V on the first reset electrode REl.
  • Fig. 3 C shows the first part of the fill state during which only the negative particles 2 are moved from the reset volume RV to the display volume DV.
  • the voltage on the first data electrode DEl should be positive with respect to the first reset electrode REl to attract the negative particles 2 towards the display volume DV.
  • the voltage on the second reset electrode RE2 and the second data electrode DE2 should be selected such that the positive particles 1 stay in the reset volume RV and the movement of the negative particles 2 towards the display volume DV is possible.
  • the voltage on the first reset electrode REl is +10V
  • the voltage on the first data electrode is +20V
  • the voltages on the second reset electrode RE2 and the second data electrode DE2 are OV.
  • Fig. 3D shows the top-bottom reversal state during which the position of the positive particles 1 and the negative particles 2 is reversed.
  • the voltages on the electrodes are changed such that in the reset volume RV the positive particles 1 are moved from the second reset electrode RE2 towards the first reset electrode REl.
  • the voltage on the first reset electrode REl should become negative with respect to the voltage on the second reset electrode RE2. Consequently, the negative particles 2 in the reset volume RV will move from the first reset electrode REl towards the second reset electrode RE2.
  • the negative particles 2 are moved in the display volume DV from the first data electrode DEl towards the second data electrode DE2 because the voltage on the first data electrode DEl is negative with respect to the voltage on the second data electrode DE2.
  • the voltages on the data electrodes DEl, DE2 have to be selected with respect to the voltages on the reset electrodes REl, RE2 such that the particles 1, 2 do not move between the reset volume RV and the display volume DV.
  • the first reset voltage REl and the first data voltage DEl both are -10V and the second reset voltage RE2 and the second data voltage DE2 both are OV.
  • Fig. 3E shows the second part of the fill state during which only the positive particles 1 are moved from the reset volume RV to the display volume DV.
  • the voltage on the first data electrode DEl should be negative with respect to the first reset electrode REl to attract the positive particles 1 towards the display volume DV.
  • the voltage on the second • reset electrode RE2 and the second data electrode DE2 should be selected such that the negative particles 2 do not move between the reset volume RV and the display volume DV, and such that the movement of the positive particles 1 towards the display volume DV is possible.
  • the voltage on the first reset electrode REl is -10V
  • the voltage on the first data electrode is -15 V
  • the voltages on the second reset electrode RE2 and the second data electrode DE2 are OV.
  • Figs. 4A - 4E show schematically another embodiment of the voltages on the electrodes of the display cell to obtain the different optical states of the display cell.
  • Figs. 4A - 4E are very similar to Figs. 3A - 3E, only the position of the particles 1, 2 is swapped at the starting situation shown in Fig. 4A with respect to the situation shown in Fig. 3A.
  • the same items in Figs. 4A — 4E as in Figs. 3A - 3E have the same function.
  • Fig. 4A shows the first part of the reset state wherein the voltage on the first reset electrode REl, the first data electrode DEl, and the second data electrode DE2 are OV, and the voltage on the second reset electrode RE2 is +10V.
  • the negative particles 2 are attracted towards the second reset electrode RE2 by the positive voltage +10V on the second reset electrode RE2.
  • the positive particles 1 will stay in the display volume DV because no electric field exists which attracts these particles 1 towards the reset volume RV.
  • the voltages applied to the electrodes may deviate from the voltages shown. What counts is that an electric field is generated which attracts the negative particles 2 towards the reset volume RV and which leaves the positive particles 1 in the display volume DV.
  • the voltage on the first reset electrode REl may be positive with respect to the first data electrode DEl, or the second data electrode DE2 may be positive with respect to the first data electrode DEL
  • Fig. 4B shows the second part of the reset state wherein the voltage on the second reset electrode RE2, the first data electrode DEl, and the second data electrode DE2 are OV, and the voltage on the first reset electrode REl is -10V.
  • the positive particles 1 are attracted towards the first reset electrode REl by the negative voltage -10V on the first reset electrode REl.
  • the negative particles 2 will stay in the reset volume RV because no electric field exists which attracts these particles 2 towards the display volume DV. Again, the voltages applied to the electrodes may deviate from the voltages shown. What counts is that an electric field is generated which attracts the positive particles 1 towards the reset volume RV and which leaves the negative particles 2 in the reset volume RV.
  • the voltage on the second data electrode DE2 may be negative with respect to the first data electrode DEl but should be less negative than the voltage -10V on the first reset electrode REl.
  • Fig. 4C shows the first part of the fill state during which only the positive particles 1 are moved from the reset volume RV to the display volume DV.
  • the voltage on the first data electrode DEl should be negative with respect to the first reset electrode REl to attract the positive particles 1 towards the display volume DV.
  • the voltage on the second reset electrode RE2 and the second data electrode DE2 should be selected such that the negative particles 2 stay in the reset volume RV and the movement of the positive particles 1 towards the display volume DV is possible.
  • the voltage on the first reset electrode REl is -10V
  • the voltage on the first data electrode is -15V
  • the voltages on the second reset electrode RE2 and the second data electrode DE2 are OV.
  • Fig. 4D shows the top-bottom reversal state during which the position of the positive particles 1 and the negative particles 2 is reversed.
  • the voltages on the electrodes are changed such that in the reset volume RV the negative particles 2 are moved from the second reset electrode RE2 towards the first reset electrode REl .
  • the voltage on the first reset electrode REl should become positive with respect to the voltage on the second reset electrode RE2. Consequently, the positive particles 1 in the reset volume RV will move from the first reset electrode REl towards the second reset electrode RE2.
  • the positive particles 1 are moved in the display volume DV from the first data electrode DEl towards the second data electrode DE2 because the voltage on the first data electrode DEl is positive with respect to the voltage on the second data electrode DE2.
  • the voltages on the data electrodes DEl, DE2 have to be selected with respect to the voltages on the reset electrodes REl, RE2 such that the particles 1, 2 do not move between the reset volume RV and the display volume DV.
  • the first reset voltage REl and the first data voltage DEl both are +10V and the second reset voltage RE2 and the second data voltage DE2 both are OV.
  • Fig. 4E shows the second part of the fill state during which only the negative particles 2 are moved from the reset volume RV to the display volume DV.
  • the voltage on the first data electrode DEl should be positive with respect to the first reset electrode REl to attract the negative particles 2 towards the display volume DV.
  • the voltage on the second reset electrode RE2 and the second data electrode DE2 should be selected such that the positive particles 1 do not move between the reset volume RV and the display volume DV, and such that the movement of the negative particles 2 towards the display volume DV is possible.
  • the voltage on the first reset electrode REl is +10V
  • the voltage on the first data electrode is +20V
  • the voltages on the second reset electrode RE2 and the second data electrode DE2 are OV.
  • Figs. 5 A - 5B show schematically an embodiment of a display cell which comprises help electrodes.
  • Both the display cells shown in Fig. 5A and 5B comprise a color filter CF, either in the form of a color filter element, or alternatively incorporated into the display cell in the form of a colored liquid or a colored reflector, a black mask BM, a first reset electrode REl, a first data electrode DEl, a second reset electrode RE2, a second data electrode DE2, a help electrode El, a help electrode E2, and a pixel volume which comprises a reservoir volume RV and a display volume DV and positive and negative particles 1, 2.
  • the pixel volume has a rectangular cross-section.
  • the second reset electrode RE2 and the second data electrode DE2 are arranged between the color filter CF and the pixel volume.
  • the black mask BM is arranged between the color filter CF and the second reset electrode RE2 to shield the reservoir volume from the viewer.
  • the viewer sees the display volume DV through the color filter CF.
  • the optical state of the display cell depends on the amount of positive and negative particles 1, 2 in the display volume DV.
  • the first reset electrode REl is positioned opposite to the second reset electrode RE2, the reset volume RV is present between the first and the second reset electrodes REl and RE2.
  • the first data electrode DEl is positioned opposite to the second data electrode DE2, the display volume DV is present between the first and the second data electrodes DEl and DE2.
  • the help electrode El is arranged between the first reset electrode REl and the first data electrode DEL
  • the help electrode E2 is arranged such that the first data electrode DEl is arranged in- between the help electrodes El and E2.
  • the particles 1, 2 can be moved through the display volume DV, as is shown, by way of example, for the negative particles in Fig. 5 A.
  • the movement of the negative particles 2 is obtained by applying a positive voltage between the help electrode El and the first reset electrode REl, and a positive voltage between the help electrode E2 and the help electrode El.
  • the voltage on the first reset electrode REl is +10V 5
  • the voltage on the help electrode El is +12V
  • the voltage on the help electrode E2 is +20V.
  • the voltages should be adapted if the positive particles 1 have to be moved through the display volume DV.
  • Particles that are not needed in the display volume DV can be returned to the reservoir volume RV by a suitable voltage on the help electrode El. It is also possible to prevent particles in the display volume to move back to the reservoir volume.
  • the voltage on the help electrode El should have both a lower level than the voltage on the first reset electrode REl, and than the voltage on the first data electrode DEL
  • the help electrode E2 it has the same voltage level as the first data electrode DEL
  • the voltage on the first reset electrode REl is +10V
  • the voltage on the help electrode El is +5V
  • the voltage on both the first data electrode DEl and the help electrode E2 is +20V. Similar effects can be reached if only one of the help electrodes El or E2 is present.
  • Fig. 6 shows an embodiment of an electrode configuration on the bottom substrate of the display cell.
  • the square help electrode E2 is positioned at the center of the display cell 10.
  • the help electrode E2 may have any other shape.
  • the geometrical center of the help electrode need not coincident with the geometric center of the display cell 10.
  • the first data electrode DEl surrounds the help electrode E2.
  • the help electrode El surrounds the first data electrode DEl, and the first reset electrode REl surrounds the help electrode El.
  • a stack of two or more of the cells 1 shown it is possible to make a stack of two or more of the cells 1 shown.
  • a complete cell may comprise two cells 1 shown. At least one of the particles in the extra cell should have an optical property different than the optical properties of the particles in the other cell.
  • This single particle cell may be controlled in a same manner as the known single particle cells with separate electrodes which are shielded from the electrodes of the cell 1.
  • the bottom electrodes of the single particle cell may be combined with the top electrodes of the cell 1.
  • any reference signs placed between parentheses shall not be construed as limiting the claim.
  • Use of the verb "comprise” and its conjugations docs not exclude the presence of elements or steps other than those stated in a claim.
  • the article "a” or “an” preceding an element does not exclude the presence of a plurality of such elements.
  • the invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)

Abstract

Le pilote d’afficheur électrophorétique avec des cellules d’affichage (10) comprend des premières particules (1) et des deuxièmes particules (2) possédant des propriétés optiques différentes et chargées de façon opposée. Une première électrode de réinitialisation (RE1) et une deuxième électrode de réinitialisation (RE2) sont associées à un volume de réservoir (RV). Une première électrode de données (DE1) et une deuxième électrode de données (DE2) sont associées à un volume d’affichage (DV). Un pilote de réinitialisation (3) fournit une tension de réinitialisation (VR) entre la première électrode de réinitialisation (RE1) et la deuxième électrode de réinitialisation (RE2). Un pilote d’affichage (4) fournit une tension de pilotage (VD) entre la première électrode de données (DE1) et la deuxième électrode de données (DE2). Un contrôleur (5) contrôle le pilote de réinitialisation (3) et le pilote d’affichage (4) pour obtenir la séquence suivante d’états pour les cellules d’affichage (10) : (i) un état de réinitialisation selon lequel les premières particules (1) et les deuxièmes particules (2) sont présentes dans le volume de réservoir (RV), (ii) un premier état de remplissage où la tension de réinitialisation (VR) possède une première polarité de réinitialisation pour attirer les premières particules (1) vers la première électrode de réinitialisation (RE1) et les deuxièmes particules (2) vers la deuxième électrode de réinitialisation (RE2) et où la tension de pilotage (VD) possède une première polarité de pilotage et un niveau pour attirer les premières particules (1) vers une partie du volume d’affichage (DV) adjacente à la première électrode de données (DE1) et pour empêcher les deuxièmes particules (2) de se déplacer entre le volume de réservoir (RV) et le volume d’affichage (DV), (iii) un état d’inversion selon lequel la tension de réinitialisation (VR) possède une deuxième polarité de réinitialisation opposée à la première polarité de réinitialisation pour attirer les deuxièmes particules (2) vers la première électrode de réinitialisation (RE1) et les premières particules (1) vers la deuxième électrode de réinitialisation (RE2) et selon lequel la tension de pilotage (DV) possède une deuxième polarité de pilotage opposée à la première polarité de pilotage et un niveau pour empêcher le déplacement des premières particules (1) et des deuxièmes particules (2) entre le volume de réinitialisation (RV) et le volume d’affichage (DV) et (iv) un deuxième état de remplissage selon lequel la tension de réinitialisation (VR) possède la deuxième polarité de réinitialisation et selon lequel la tension de pilotage (VB) possède la deuxième polarité de pilotage et un niveau pour attirer les deuxièmes particules (2) vers le volume d’affichage (DV) adjacent à la première électrode de données (DE1) et pour empêcher les premières particules (1) de se déplacer entre le volume de réservoir (RV) et le volume d’affichage (DV).
PCT/IB2005/052487 2004-08-10 2005-07-25 Afficheur électrophorétique Ceased WO2006016301A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP04103838 2004-08-10
EP04103838.1 2004-08-10

Publications (1)

Publication Number Publication Date
WO2006016301A1 true WO2006016301A1 (fr) 2006-02-16

Family

ID=35058602

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2005/052487 Ceased WO2006016301A1 (fr) 2004-08-10 2005-07-25 Afficheur électrophorétique

Country Status (2)

Country Link
TW (1) TW200620216A (fr)
WO (1) WO2006016301A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008065603A1 (fr) * 2006-11-30 2008-06-05 Koninklijke Philips Electronics N.V. Procédé de commande pour une cellule électrophorétique et dispositif électrophorétique
WO2024146065A1 (fr) * 2023-01-05 2024-07-11 惠科股份有限公司 Écran à encre électronique et son procédé de commande

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030038772A1 (en) * 2001-08-23 2003-02-27 De Boer Dirk Kornelis Gerhardus Electrophoretic display device
US20030231162A1 (en) * 2002-06-14 2003-12-18 Canon Kabushiki Kaisha Color electrophoretic display device
WO2004088409A1 (fr) * 2003-04-03 2004-10-14 Koninklijke Philips Electronics N.V. Affichage couleur electrophoretique
WO2005076062A1 (fr) * 2004-02-06 2005-08-18 Koninklijke Philips Electronics N.V. Panneau d'affichage electrophoretique

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030038772A1 (en) * 2001-08-23 2003-02-27 De Boer Dirk Kornelis Gerhardus Electrophoretic display device
US20030231162A1 (en) * 2002-06-14 2003-12-18 Canon Kabushiki Kaisha Color electrophoretic display device
WO2004088409A1 (fr) * 2003-04-03 2004-10-14 Koninklijke Philips Electronics N.V. Affichage couleur electrophoretique
WO2005076062A1 (fr) * 2004-02-06 2005-08-18 Koninklijke Philips Electronics N.V. Panneau d'affichage electrophoretique

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008065603A1 (fr) * 2006-11-30 2008-06-05 Koninklijke Philips Electronics N.V. Procédé de commande pour une cellule électrophorétique et dispositif électrophorétique
JP2010511195A (ja) * 2006-11-30 2010-04-08 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 電気泳動セルについての駆動方法及び電気泳動装置
CN104217685A (zh) * 2006-11-30 2014-12-17 皇家飞利浦电子股份有限公司 用于电泳单元的驱动方法和电泳设备
KR101475249B1 (ko) * 2006-11-30 2014-12-22 코닌클리케 필립스 엔.브이. 전기영동 셀을 위한 구동 방법, 및 전기영동 디바이스
US9633610B2 (en) 2006-11-30 2017-04-25 Philips Lighting Holding B.V. Drive method for an electrophoretic cell and an electrophoretic device
EP2102847B1 (fr) 2006-11-30 2017-10-25 Philips Lighting Holding B.V. Procédé de commande pour une cellule électrophorétique et dispositif électrophorétique
WO2024146065A1 (fr) * 2023-01-05 2024-07-11 惠科股份有限公司 Écran à encre électronique et son procédé de commande
US12367841B2 (en) 2023-01-05 2025-07-22 HKC Corporation Limited Electronic ink screen and driving method thereof

Also Published As

Publication number Publication date
TW200620216A (en) 2006-06-16

Similar Documents

Publication Publication Date Title
KR102155950B1 (ko) 전기 광학 디스플레이의 구동 방법
JP5478255B2 (ja) 電気泳動セルについての駆動方法及び電気泳動装置
US8797634B2 (en) Multi-color electrophoretic displays
KR102128215B1 (ko) 컬러 전기영동 디스플레이들을 위한 dc-밸런스드 리프레시 시퀀스들을 제공하는 드라이버들
US7250933B2 (en) Electrophoretic display device
CN100588268C (zh) 组合单视图/多视图显示器
KR102789344B1 (ko) 컬러 전기영동 디스플레이들로부터 이전 상태 정보를 제거하기 위한 구동 시퀀스들
EP1779368A2 (fr) Panneau d'affichage electrophoretique
KR20060097128A (ko) 감소된 영상 잔상을 갖는 전기영동 디스플레이 디바이스를구동하기 위한 방법과 장치
US11520202B2 (en) Electro-optic displays, and methods for driving same
KR20070006727A (ko) 전기 영동 디스플레이 패널
US20060209009A1 (en) Color electrophoretic display
US7379228B2 (en) Electrophoretic display
EP3995886B1 (fr) Fluide électrophorétique, dispositif d'affichage d'image et procédé de commande d'affichage d'image
WO2006016301A1 (fr) Afficheur électrophorétique
CN120826734A (zh) 彩色电泳显示器中用于改良色域的驱动方案
US11289036B2 (en) Methods for driving electro-optic displays

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KM KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NG NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SM SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU LV MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase