WO2007004120A2 - Attenuation de la diaphonie dans des dispositifs d'affichage electrophoretiques - Google Patents

Attenuation de la diaphonie dans des dispositifs d'affichage electrophoretiques Download PDF

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Publication number
WO2007004120A2
WO2007004120A2 PCT/IB2006/052110 IB2006052110W WO2007004120A2 WO 2007004120 A2 WO2007004120 A2 WO 2007004120A2 IB 2006052110 W IB2006052110 W IB 2006052110W WO 2007004120 A2 WO2007004120 A2 WO 2007004120A2
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WO
WIPO (PCT)
Prior art keywords
pixel
pixels
voltage
voltages
electrode
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Application number
PCT/IB2006/052110
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English (en)
Other versions
WO2007004120A3 (fr
Inventor
Mark T. Johnson
Martinus H. W. M. Van Delden
Original Assignee
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 WO2007004120A2 publication Critical patent/WO2007004120A2/fr
Publication of WO2007004120A3 publication Critical patent/WO2007004120A3/fr

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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3433—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices
    • G09G3/344—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices based on particles moving in a fluid or in a gas, e.g. electrophoretic devices
    • G—PHYSICS
    • 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
    • G09G3/36—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 liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • G09G3/3651—Control of matrices with row and column drivers using an active matrix using multistable liquid crystals, e.g. ferroelectric liquid crystals
    • 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
    • G09G2300/0421—Structural details of the set of electrodes
    • G09G2300/0434—Flat panel display in which a field is applied parallel to the display plane
    • 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
    • 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
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0243—Details of the generation of driving signals
    • G09G2310/0254—Control of polarity reversal in general, other than for liquid crystal displays
    • 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
    • G09G2320/0209—Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/16—Determination of a pixel data signal depending on the signal applied in the previous frame

Definitions

  • the invention relates to a method of driving an in-plane switching electrophoretic display, the display comprising a plurality of pixels and a common electrode for electrically separating the pixels from each other, each of the pixels comprising a pixel electrode, the method comprising applying a pixel voltage to at least one pixel electrode for obtaining a gray value for the corresponding pixel, and applying a collector voltage to the common electrode.
  • the invention further relates to a computer program product for performing said method.
  • the invention further relates to an in-plane switching electrophoretic display capable of performing said method.
  • the invention further relates to driving means for use in said in-plane switching electrophoretic display.
  • In-plane switching multi-color electrophoretic displays are, in general, displays of the reflective type, and use charged pigment particles as a means of incident light manipulation. Different pigment particles may be used for pixels of different colors. A multicolor effect may also be realized by using one kind of pigment particles and introducing different gray values. A multi color effect could also be realized using a color filter arrangement in combination with a for example a black pigment. The best multi-color effect is realized by using both differently colored pigment particles and gray values.
  • the optical properties of the particles are chosen to absorb or reflect a part of the incident light.
  • the pigment particles are suspended in a fluid, and generally a liquid.
  • Each pixel of the display comprises a pixel electrode.
  • the pixels are substantially surrounded by a common collector electrode. Voltages are supplied to the electrodes such that in one state, the pigment particles move to the pixel electrode and in another state move to the collector electrode.
  • the particles may either reflect the incident light in part, or in part shield the displaying electrode from incident light. Consequently, when the particles are at the collector electrode, the pixel electrode may either reflect or absorb the incident light in part. In other words, the charged particles move in or out of the field of view.
  • the particles are manipulated in-plane. Gray values are generally obtained by applying different voltages to different pixel electrodes. When a higher voltage is applied to the pixel electrode, more particles move to said pixel electrode and less particles stay at the collector electrode.
  • in-plane manipulation is a large compatibility with the existing LCD infrastructure, low voltage driving with a fast response speed, precisely controlled gray scale, brighter systems and the option of using only a single structured substrate.
  • the penalty of in-plane manipulation is electric field cross talk between neighboring pixels, which becomes a substantial problem in high-resolution devices.
  • Cross talk is a visible artifact in multi-color electrophoretic displays. Cross talk occurs when particles in a particular pixel should migrate from the common electrode to the pixel center but, due to the higher voltage of the neighboring pixel electrode, are attracted to the pixel center of a neighboring cell and hence stay at the common electrode. The particular pixel value will then show a lighter gray value than intended.
  • the collector electrode also functions as a guard electrode for shielding the pixels from its neighbors, but this shielding effect of the guard ring is not sufficient for reducing cross talk.
  • this object is achieved by providing a method according to the opening paragraph wherein for each pair of nearest neighbor pixels, the pixel voltage applied to at least one of the pixel electrodes is substantially equal to the collector voltage, or the pixel voltages applied to the pixel electrodes are substantially equal to each other.
  • both pixels When applying substantial equal voltages to the pixel electrodes of two neighboring pixels, due to symmetry, both pixels will have equal effects on the particles of the other pixel. Both pixels will show equal gray values and no artifacts will be visible.
  • the pixel voltage applied to a pixel electrode is substantially equal to the collector voltage, the particles in the corresponding pixel will not migrate. The gray value of the pixel is not changed. In other words, the pixel is not driven. Therefore it will be no problem when, due to the higher voltage of the neighboring pixel electrode, the particles of the non-driven pixel are attracted to the pixel center of the neighboring cell and, hence, stay at the common electrode.
  • the invention is based on the insight that cross talk typically occurs when different pixel voltages are applied to neighboring pixels in order to obtain different gray values, and the common electrode is at a voltage differing from the pixel voltages. For example, three adjacent pixel electrodes are being driven at different voltages 5 V, 10V and 5V, respectively, whilst the common or guard electrode is placed at ground voltage OV. Assuming that the pixels contain negatively charged particles, in all three pixels, it may be clear that it is intended to move particles away from the wall region at the edge of the pixel where they were stored from a previous action, such as a reset pulse, towards the pixel electrodes.
  • a maximum of two different voltage levels is applied to the pixel electrodes and the collector voltage is substantially equal to one of the two different voltage levels.
  • the gray values of the pixels are preferably obtained by modulating a duration of the application of the pixel voltage.
  • the gray value of a pixel depends on the voltages that are applied to the electrodes and on the time during which these voltages are applied. The higher the potential difference between the pixel electrode and the common electrode, the darker the corresponding pixel.
  • this embodiment only 2 voltage levels are used and modulating the voltage levels of the applied voltages for obtaining gray values is not possible. Instead, the duration of the applying of the voltages is modulated. The longer the voltage is applied, the darker the pixel.
  • the pixel voltages applied to at least one of the pixel electrodes of the pair of nearest neighbor pixels is substantially equal to the collector voltage.
  • two nearest neighbor pixels are never driven at the same time.
  • the pixel voltage applied to a pixel electrode is substantially equal to the collector voltage, the particles in the corresponding pixel will not migrate. The gray value of the pixel is not changed. No cross talk will occur.
  • the driven pixels may be driven at any possible voltage.
  • gray values can be obtained by using higher pixel electrode voltages for obtaining darker pixels.
  • the pixels may, for example, be arranged in a square grid.
  • All pixels of the display may then be driven in two steps, using a so called 'chessboard' pattern. First all the 'white' pixels are driven, and then all the 'black' pixels.
  • the pixels are arranged in a triangular grid or a hexagonal grid.
  • the display is also preferably driven in two steps. With the two steps driving method for square grids and triangular grids, no nearest neighbor pixels are written at the same time. However, corner points of driven pixels are located next to corner points of other driven pixels. This may result in minor cross talk effects, when different voltages are applied to the pixel electrodes of different pixels. Cross talk at corner points of driven pixel is prevented by using a hexagonal grid.
  • the display is preferably written in three steps. Each driven pixel except at the edges of the display is then surrounded by six non driven pixels.
  • Another aspect of the invention provides a computer program product as claimed in claim 9.
  • Another aspect of the invention provides an in-plane switching electrophoretic display as claimed in claim 10.
  • 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.
  • Figure Ia schematically shows three pixels of an electrophoretic display
  • Figure Ib illustrates cross talk in the situation shown in figure Ia
  • FIG. 2 shows a block diagram of an embodiment of the method according to the invention
  • FIG. 3 shows a block diagram of an embodiment of the method according to the invention
  • Figure 4 schematically shows a driving approach according to the invention with pixels in a square grid
  • Figure 5 schematically shows a driving approach according to the invention with pixels in a triangular grid
  • Figure 6 schematically shows a driving approach according to the invention with pixels in a hexagonal grid
  • Figure 7 schematically shows a driving approach according to the invention with pixels in a 'pentile' grid
  • FIG. Ia schematically shows three pixels 11, 12, 13 of an electrophoretic display.
  • Each pixel 11, 12, 13 comprises charged pigment particles 17.
  • the particles 17 may be black or colored.
  • the pixels 11, 12, 13 are separated by pixel walls 14, which ensure that the particles 17 can not leave the pixel 11, 12, 13.
  • the pixel wall 14 comprises a common collector electrode 15.
  • the voltage of the collector electrode 15 is equal for all pixels 11, 12, 13 in the display.
  • the common collector electrode 15 is coupled to ground 19.
  • the common collector electrode 15 may be coupled to a power source for bringing the common collector electrode 15 to a chosen voltage and for enabling changing of the voltage of the common collector electrode 15.
  • Each pixel 11, 12, 13 further comprises a pixel electrode 16 which is coupled to a pixel driver 18.
  • the pigment particles 17 are located at one of the electrodes 15, 16 or are moving from one electrode to the other.
  • the perceived color of a pixel 11, 12, 13 results from the reflection of light from the pixel electrode 16, from the pigment particles 17 covering the pixel electrode 16 or from a combination of both.
  • the pigment particles may, for example, be black, red, blue or green.
  • 16 different gray values of these colors are displayed. Lower gray values correspond to whiter pixels and higher gray values correspond to darker black, red, blue or green pixels. Combinations of red, blue and green pixels are used for making other colors.
  • the pixels 11, 12, 13 contain negatively charged particles 17 in all three pixels 11, 12, 13.
  • the display is reset by applying a positive voltage to the common collector electrode 15 or a negative voltage to all pixel electrodes 16, causing all negatively charged pigment particles 17 to gather at the pixel wall 14 at the edges of the pixels 11, 12, 13.
  • the common collector electrode 15 is coupled to ground 19 and the pixel driver 18 provides different voltages to the three pixels 11, 12, 13 to arrive at the situation as shown in figure Ia. No voltage is provided to the pixel electrode 16 of the first pixel 11. Consequently, the pigment particles 17 in the first pixel stay at the pixel wall 14.
  • the pixel 11 is white and has a low or zero gray value.
  • the color of the pigment particles 17 determines the color of the pixel 12.
  • the pixel 12 has a high or even maximum gray value.
  • a lower voltage of, for example, 5V is applied to the pixel electrode 16 of the third pixel 13, causing only part of the pigment particles 17 to migrate to the pixel electrode 16. Consequently the pixel will have a medium gray value.
  • Figure Ia shows a situation, wherein the occurrences of cross talk is not taken into account.
  • Figure Ib the same set up is shown (partly), but now also the effect of cross talk is shown.
  • voltages are applied to the pixel electrode 16 and the collector electrodes 15, 16 as described above with reference to figure Ia. Due to the high voltage, applied to the pixel electrode 16 of the second pixel 12, pigment particles 17 at the pixel walls 14 of the first pixel 11 and the third pixel 13 are attracted to the second pixel 12 and thus stay at the pixel wall 14 at the edge of their pixel. For the first pixel 11 this is not a problem, because the attracted pigment particles 17 were intended to stay at the pixel wall 14.
  • the pixel 13 has a lower gray value than intended. This cross talk results in extremely visible artifacts. At transition from darker areas to lighter areas thin lines occur, with a gray value lower than both of the neighboring areas.
  • FIG. 2 shows a block diagram of the method according to the invention.
  • graphics data arrives at the input of the display.
  • the data may, come from a video card of a personal computer, from an output of a video camera or from any other type of analog or digital apparatus with a graphics output. If the input data is analog, then the input step 51 also includes an A/D conversion step.
  • the input graphics data is converted to gray values. For each pixel of the display a gray value is determined, based on the graphics data. Thereafter the gray values are to be applied to the pixels.
  • Several techniques are known for applying gray values to the pixels. All embodiments of the method according to the invention involve applying voltages to a pixel electrode and/or a collector electrode.
  • the applying of the gray values starts with a reset step 53.
  • the reset step 53 is performed for collecting all charged pigment particles at the pixel wall. Assuming that the pixels contain negatively charged particles the reset step may be performed by applying a positive voltage to the common collector electrode or a negative voltage to all pixel electrodes.
  • write step 54 different voltages are applied to the individual pixel electrodes and the common collector electrode, for obtaining the gray values as determined in processing step 52. If, for example, the common collector electrode is coupled to ground and a high positive voltage is applied to a pixel electrode, many pigment particles move to the pixel electrode and a high gray value is obtained.
  • the display requires a memory for storing the current gray values of all pixels.
  • the voltages that are to be applied in write step 54 are to be determined.
  • the current gray values of the pixels are read from the memory.
  • the required gray values, as obtained in processing step, 52 are compared with the gray values which are read from the memory in read step 61.
  • the obtained differences of gray values per pixel indicate for each pixel whether the gray value is to be changed and if it has to be changed whether the pixel requires a higher or a lower gray value. From these differences, the pixel voltages that are to be applied to the pixel electrodes are calculated.
  • the voltages that are applied to the pixel electrode (pixel voltages) and the voltage that is applied to the common collector electrode (collector voltage) are such that for each pair of nearest neighbor pixels the pixel voltages applied to at least one of the pixel electrodes is substantially equal to the collector voltage, or the pixel voltages applied to the pixel electrodes are substantially equal to each other.
  • two voltages are considered substantially equal when a difference between the two voltages is less than or equal to 20% of the highest voltage of the two voltages.
  • a variety of driving methods may be used for driving the display, while meeting the above requirements:
  • gray values are obtained by modulating the duration of the application of the 10V pixel voltage.
  • the gray value of a pixel does not only depend on the voltages that are applied to the electrodes, but also on the time during which these voltages are applied. The longer the voltage is applied, the darker the pixel. In subsequent frames, a different combination of the two voltages may be applied, for example OV and 5 V. The lower voltage may allow for a more precise control of the movement of particles, and hence more flexibility in defining e.g. gray levels
  • the use of a display reset may be avoided by driving the particles with positive and negative voltages in alternating frames (one frame with positive voltages and voltages equal to that of the common electrode: next frame with negative voltages and voltages equal to that of the common electrode).
  • the total image update may require a long series of sequential positive and negative frames, but could also encompass several positive frames (e.g. completing the image for the pixels requiring a positive voltage) followed by several negative frames (e.g. completing the image for the pixels requiring a negative voltage). Avoiding a reset results in a more natural image update (the entire display does not become blank between 2 images).
  • the display requires a memory for storing the current gray value of each pixel. 3.
  • voltages are applied to the electrodes, such that nearest neighbor pixels are not driven at the same time. In this manner the driven pixels are more effectively isolated from their neighboring pixels, whereby cross talk will be reduced.
  • This spatial sequential driving approach allows for the driven pixels to be given any number of different voltages or different voltage polarities.
  • the electrical field strength in the non-driven pixel (OV) is far lower, reducing the (unwanted) movement of particles in these pixels, whereby the cross talk is far reduced.
  • particles in the driven pixel all move towards the pixel electrode, as required.
  • Four embodiments of such driving methods are shown in Figure 4-7.
  • Figure 4 shows a matrix arranged on a square grid.
  • the collecting electrode/guard ring is set to OV, and each pixel electrode can be driven individually to voltage levels other than that of the common electrode (and in general can be driven to many different voltage levels).
  • the display is driven such that half of the pixels, arranged on a checker board pattern, are driven with an arbitrary voltage V (V may be positive, negative and of any magnitude in any pixel), whilst the remaining pixels are held at the voltage of the collecting electrode/guard ring, in this case OV. There should be no particle movement in these pixels.
  • every driven pixel is surrounded only by nearest neighbour pixels at the voltage of the guard ring (OV).
  • the electrical field strength in the non-driven pixel is far lower, reducing the (unwanted) movement of particles in these pixels, whereby the cross talk is far reduced.
  • particles in the driven pixel all move towards the pixel electrode, as required.
  • the adjacent pixel is also functioning as a guard rail, being at the voltage of the guard ring.
  • the total image update (which covers many frame periods and may include shaking pulses, reset pulses, driving pulses etc.) may be completed for one set of pixels before the second set of pixels is addressed.
  • the second set of pixels may be driven before the image update of the first set is completed.
  • the first set of pixels must be driven again to complete their image transition.
  • both first and second sets of pixels are repeatedly driven (in an alternating manner) before the new image is completed.
  • certain portions of the image update (such as shaking pulses or reset pulses) may be carried out for all pixels simultaneously providing these voltages are the same for all pixels, whilst only the pixel dependent portions (e.g. drive pulses) are carried out according to this invention.
  • next-nearest neighbor pixels will be driven at a voltage which may be different to that of the driven pixel or of the guard ring.
  • the cross talk arising from this situation will be considerably reduced since the closest separation between next nearest neighbour pixels is smaller and he next- nearest neighbor pixels are only in close proximity at the corners - all other pars of the pixels are well shielded by the nearest neighbor pixels (which are at the voltage of the guard ring).
  • a matrix is arranged on a triangular grid (i.e. a
  • the collecting electrode/guard ring is set at OV, and each pixel electrode can be driven individually to voltage levels other than that of the common electrode (and in general can be driven to many different voltage levels).
  • the display is driven such that half of the pixels, are driven with an arbitrary voltage V (V may be positive, negative and of any magnitude in any pixel), whilst the remaining pixels are held at the voltage of the collecting electrode/guard ring, in this case OV. There should be no particle movement in these pixels.
  • V may be positive, negative and of any magnitude in any pixel
  • a matrix is arranged on a hexagonal grid ( Figure 6).
  • the collecting electrode/guard ring is set at OV, and each pixel electrode can be driven individually to voltage levels other than that of the common electrode (and in general can be driven to many different voltage levels).
  • Each pixel now has 6 nearest neighbours and in order to avoid the cross talk situation as shown in figure Ib, the display is driven with 3 subsets of pixels. In this manner one third of the pixels, are driven with an arbitrary voltage V (V may be positive, negative and of any magnitude in any pixel), whilst the remaining pixels are held at the voltage of the collecting electrode/guard ring, in this case OV. There should be no particle movement in these pixels.
  • the first set of driven pixels once they have reached their required brightness level, they will be set to the voltage of the guard ring, and the second set of pixels driven to an arbitrary voltage.
  • the remaining pixels will be driven by setting the first and second sets to the guard ring voltage.
  • a matrix is arranged on a more complicated grid pattern, as is used for e.g. "pentile" structures (which are proposed to increase the apparent resolution of a display without increasing the number of pixels - see Figure 7).
  • the collecting electrode/guard ring is set at OV, and each pixel electrode can be driven individually to voltage levels other than that of the common electrode (and in general can be driven to many different voltage levels).
  • the remaining pixels (c) will be driven by setting the first and second sets to the guard ring voltage.

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

Abstract

L'invention concerne un procédé d'excitation d'un dispositif d'affichage électrophorétique multicolore à mode de commutation dans le plan. Ce dispositif d'affichage présente une pluralité de pixels et une électrode commune destinée à séparer électriquement les pixels les uns des autres, chacun des pixels comportant une électrode de pixel destinée à l'attraction ou à la répulsion de particules pigmentaires. Ledit procédé consiste à appliquer une tension de pixel à au moins une électrode de pixel afin d'obtenir des valeurs de gris et à appliquer une tension de collecteur à l'électrode commune. Pour chaque paire de pixels voisins les plus proches, la tension de pixel appliquée à au moins une des électrodes de pixel est sensiblement égale à la tension de collecteur ou bien les tensions de pixel appliquées aux électrodes de pixel sont sensiblement égales. Le procédé d'excitation selon l'invention permet d'atténuer la diaphonie.
PCT/IB2006/052110 2005-06-30 2006-06-27 Attenuation de la diaphonie dans des dispositifs d'affichage electrophoretiques WO2007004120A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP05105917 2005-06-30
EP05105917.8 2005-06-30

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WO2007004120A2 true WO2007004120A2 (fr) 2007-01-11
WO2007004120A3 WO2007004120A3 (fr) 2007-05-03

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WO2011012499A1 (fr) 2009-07-27 2011-02-03 Irex Technologies B.V. Dispositif d'affichage électrophorétique
WO2017007323A1 (fr) 2015-07-08 2017-01-12 Hj Patents Bv Dispositif de commutation électrophorétique en ligne
WO2017200375A1 (fr) 2016-05-17 2017-11-23 Hj Forever Patents B.V. Dispositif électrophorétique comprenant des nanoparticules
CN112639602A (zh) * 2018-09-17 2021-04-09 伊英克公司 具有六角形和三角形电极的背板
EP4238086A4 (fr) * 2020-11-02 2024-06-12 E Ink Corporation Procédés de réduction d'artéfacts d'image pendant des mises à jour partielles de dispositifs d'affichage électrophorétiques

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