WO2005038765A1 - Tables de consultation a formes d'onde de transition de niveaux de gris pour des affichages bistables - Google Patents

Tables de consultation a formes d'onde de transition de niveaux de gris pour des affichages bistables Download PDF

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Publication number
WO2005038765A1
WO2005038765A1 PCT/IB2004/052092 IB2004052092W WO2005038765A1 WO 2005038765 A1 WO2005038765 A1 WO 2005038765A1 IB 2004052092 W IB2004052092 W IB 2004052092W WO 2005038765 A1 WO2005038765 A1 WO 2005038765A1
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WO
WIPO (PCT)
Prior art keywords
display
coded data
retrieving
driving
stored
Prior art date
Application number
PCT/IB2004/052092
Other languages
English (en)
Inventor
Guofu Zhou
Jan Van De Kamer
Mark T. Johnson
Neculai Ailenei
Original Assignee
Koninklijke Philips Electronics, N.V.
U.S. Philips Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics, N.V., U.S. Philips Corporation filed Critical Koninklijke Philips Electronics, N.V.
Priority to US10/575,518 priority Critical patent/US20070085819A1/en
Priority to EP04770254A priority patent/EP1676258A1/fr
Priority to JP2006534898A priority patent/JP2007508595A/ja
Publication of WO2005038765A1 publication Critical patent/WO2005038765A1/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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0285—Improving the quality of display appearance using tables for spatial correction of display data
    • 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
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/041—Temperature compensation

Definitions

  • the invention relates generally to electronic reading devices such as electronic books and electronic newspapers and, more particularly, to a method and apparatus for controlling a bi-stable display such as an electrophoretic display.
  • electronic reading devices such as electronic books and electronic newspapers
  • electrophoretic displays hold much promise.
  • Such displays have an intrinsic memory behavior and are able to hold an image for a relatively long time without power consumption. Power is consumed only when the display needs to be refreshed or updated with new information. So, the power consumption in such displays is very low, suitable for applications for portable e-reading devices like e-books and e-newspaper.
  • Electrophoresis refers to movement of charged particles in an applied electric field.
  • An electrophoretic display is a type of bi-stable display, which is a display that substantially holds an image without consuming power after an image update.
  • WO 99/53373 published April 9, 1999, by E Ink Corporation, Cambridge, Massachusetts, US, and entitled Full Color Reflective Display With Multichromatic Sub-Pixels, describes such a display device.
  • WO 99/53373 discusses an electronic ink display having two substrates. One is transparent, and the other is provided with electrodes arranged in rows and columns.
  • a display element or pixel is associated with an intersection of a row electrode and column electrode.
  • the display element is coupled to the column electrode using a thin film transistor (TFT), the gate of which is coupled to the row electrode.
  • TFT thin film transistor
  • This arrangement of display elements, TFT transistors, and row and column electrodes together forms an active matrix.
  • the display element comprises a pixel electrode.
  • a row driver selects a row of display elements, and a column or source driver supplies a data signal to the selected row of display elements via the column electrodes and the TFT transistors.
  • the data signals correspond to graphic data to be displayed, such as text or figures.
  • the electronic ink is provided between the pixel electrode and a common electrode on the transparent substrate.
  • the electronic ink comprises multiple microcapsules of about 10 to 50 microns in diameter.
  • each microcapsule has positively charged white particles and negatively charged black particles suspended in a liquid carrier medium or fluid.
  • a positive voltage is applied to the pixel electrode, the white particles move to a side of the microcapsule directed to the transparent substrate and a viewer will see a white display element.
  • the black particles move to the pixel electrode at the opposite side of the microcapsule where they are hidden from the viewer.
  • a negative voltage is applied to the pixel electrode, the black particles move to the common electrode at the side of the microcapsule directed to the transparent substrate and the display element appears dark to the viewer.
  • the white particles move to the pixel electrode at the opposite side of the microcapsule where they are hidden from the viewer.
  • particles are provided in a dyed liquid.
  • black particles may be provided in a white liquid, or white particles may be provided in a black liquid.
  • other colored particles may be provided in different colored liquids, e.g., white particles in green liquid.
  • Other fluids such as air may also be used in the medium in which the charged black and white particles move around in an electric field (e.g., Bridgestone SID2003 - Symposium on Information Displays. May 18-23, 2003, - digest 20.3). Colored particles may also be used.
  • the electronic ink may be printed onto a sheet of plastic film that is laminated to a layer of circuitry.
  • the circuitry forms a pattern of pixels that can then be controlled by a display driver. Since the microcapsules are suspended in a liquid carrier medium, they can be printed using existing screen-printing processes onto virtually any surface, including glass, plastic, fabric and even paper. Moreover, the use of flexible sheets allows the design of electronic reading devices that approximate the appearance of a conventional book.
  • electrophoretic and other bi-stable displays must be addressed and controlled in a different way than other displays such as LCDs because of their sensitivity to both the driving voltage amplitude/pulse width and the voltage signs or polarities, the relatively long switching or update time for monochrome mode updates, the even longer update time for greyscale mode updates, and sensitivity to image history.
  • the present invention addresses the above and other issues by providing an efficient scheme for controlling a bi-stable display.
  • a method for driving a display in a bi-stable device includes storing coded data for driving the display for different pixel transitions, retrieving a portion of the stored coded data based on at least a selected one of the pixel transitions, decoding the portion of the stored coded data to provide decoded data, and providing at least one voltage waveform for driving the display based on the decoded data.
  • a related controller and program storage device are also provided.
  • Fig. 1 shows diagramatically a front view of an embodiment of a portion of a display screen of an electronic reading device
  • Fig. 2 shows diagramatically a cross-sectional view along 2-2 in Fig. 1
  • FIG. 3 shows diagramatically an overview of an electronic reading device
  • Fig. 4 shows diagramatically two display screens with respective display regions
  • Fig. 5 illustrates an algorithm for controlling a display with multiple image update modes
  • Fig. 6 illustrates a data layout in memory
  • Fig. 7 illustrates conceptually the selection of a sequence based on a display update mode.
  • Figures 1 and 2 show the embodiment of a portion of a display panel 1 of an electronic reading device having a first substrate 8, a second opposed substrate 9 and a plurality of picture elements 2.
  • the picture elements 2 may be arranged along substantially straight lines in a two-dimensional structure.
  • the picture elements 2 are shown spaced apart from one another for clarity, but in practice, the picture elements 2 are very close to one another so as to form a continuous image. Moreover, only a portion of a full display screen is shown. Other arrangements of the picture elements are possible, such as a honeycomb arrangement.
  • An electrophoretic medium '5 having charged particles 6 is present between the substrates 8 and 9.
  • a first electrode 3 and second electrode 4 are associated with each picture element 2. The electrodes 3 and 4 are able to receive a potential difference.
  • the first substrate has a first electrode 3 and the second substrate 9 has a second electrode 4.
  • the charged particles 6 are able to occupy positions near either of the electrodes 3 and 4 or intermediate to them.
  • Each picture element 2 has an appearance determined by the position of the charged particles 6 between the electrodes 3 and 4.
  • Electrophoretic media 5 are known per se, e.g., from U.S. patents 5,961,804, 6,120,839, and 6,130,774 and can be obtained, for instance, from E Ink Corporation.
  • the electrophoretic medium 5 may contain negatively charged black particles 6 in a white fluid.
  • the appearance of the picture elements 2 is white.
  • the charged particles 6 are near the second electrode 4 due to a potential difference of opposite polarity, e.g., -15 Volts, the appearance of the picture elements 2 is black.
  • An application-specific integrated circuit (ASIC) 100 controls the potential difference of each picture element 2 to create a desired picture, e.g. images and/or text, in a full display screen.
  • the full display screen is made up of numerous picture elements that correspond to pixels in a display.
  • Fig. 3 shows diagramatically an overview of an electronic reading device.
  • the electronic reading device 300 includes the display ASIC 100.
  • the ASIC 100 may be the Philips Corp. "Apollo" ASIC E-ink display controller.
  • the display ASIC 100 controls the one or more display screens 310, such as electrophoretic screens, via an addressing circuit 305, to cause desired text or images to be displayed.
  • the addressing circuit 305 includes driving integrated circuits (ICs).
  • the display ASIC 100 may provide voltage via an addressing circuit 305 waveforms to the different pixels in the display screen 310.
  • the addressing circuit 305 provides information for addressing specific pixels, such as row and column, to cause the desired image or text to be displayed.
  • the display ASIC 100 causes successive pages to be displayed starting on different rows and/or columns.
  • the image or text data may be stored in a memory 320, which represents one or more storage devices.
  • SFFO Philips Electronics small form factor optical
  • the electronic reading device 300 further includes a reading device controller 330 or host controller, which may be responsive to a user-activated software or hardware button 322 that initiates a user command such as a next page command or previous page command.
  • the reading device controller 330 may be part of a computer that executes any type of computer code devices, such as software, firmware, micro code or the like, to achieve the functionality described herein. Accordingly, a computer program product comprising such computer code devices may be provided in a manner apparent to those skilled in the art.
  • the reading device controller 330 may further comprise a memory (not shown) that is a program storage device that tangibly embodies a program of instructions executable by a machine such as the reading device controller 330 or a computer to perform a method that achieves the functionality described herein. Such a program storage device may be provided in a manner apparent to those skilled in the art.
  • the display ASIC 100 may have logic for periodically providing a forced reset of a display region of an electronic book, e.g., after every x pages are displayed, after every y minutes, e.g., ten minutes, when the electronic reading device 300 is first turned on, and/or when the brightness deviation is larger than a value such as 3% reflection.
  • an acceptable frequency can be determined empirically based on the lowest frequency that results in acceptable image quality.
  • the reset can be initiated manually by the user via a function button or other interface device, e.g., when the user starts to read the electronic reading device, or when the image quality drops to an unacceptable level.
  • the ASIC 100 provides instructions to the display addressing circuit 305 for driving the display 310 based on information stored in the memory 320, as discussed further below.
  • the invention may be used with any type of electronic reading device.
  • Fig. 4 illustrates one possible example of an electronic reading device 400 having two separate display screens. Specifically, a first display region 442 is provided on a first screen 440, and a second display region 452 is provided on a second screen 450.
  • the screens 440 and 450 may be connected by a binding 445 that allows the screens to be folded flat against each other, or opened up and laid flat on a surface. This arrangement is desirable since it closely replicates the experience of reading a conventional book.
  • Various user interface devices may be provided to allow the user to initiate page forward, page backward commands and the like.
  • the first region 442 may include on-screen buttons 424 that can be activated using a mouse or other pointing device, a touch activation, PDA pen, or other known technique, to navigate among the pages of the electronic reading device.
  • a capability may be provided to scroll up or down in the same page.
  • Hardware buttons 422 may be provided alternatively, or additionally, to allow the user to provide page forward and page backward commands.
  • the second region 452 may also include on-screen buttons 414 and/or hardware buttons 412.
  • the frame 405 around the first and second display regions 442, 452 is not required as the display regions may be frameless.
  • Other interfaces such as a voice command interface, may be used as well.
  • the buttons 412, 414; 422, 424 are not required for both display regions. That is, a single set of page forward and page backward buttons may be provided. Or, a single button or other device, such as a rocker switch, may be actuated to provide both page forward and page backward commands.
  • a function button or other interface device can also be provided to allow the user to manually initiate a reset.
  • an electronic book has a single display screen with a single display region that displays one page at a time.
  • a single display screen may be partitioned into or two or more display regions arranged, e.g., horizontally or vertically.
  • successive pages can be displayed in any desired order. For example, in Fig. 4, a first page can be displayed on the display region 442, while a second page is displayed on the display region 452.
  • a third page may be displayed in the first display region 442 in place of the first page while the second page remains displayed in the second display region 452.
  • a fourth page may be displayed in the second display region 452, and so forth.
  • both display regions are updated so that the third page is displayed in the first display region 442 in place of the first page, and the fourth page is displayed in the second display region 452 in place of the second page.
  • a first page may be displayed, then a second page overwrites the first page, and so forth, when the user enters a next page command.
  • the process can work in reverse for page back commands.
  • the process is equally applicable to languages in which text is read from right to left, such as Hebrew, as well as to languages such as Chinese in which text is read column-wise rather than row-wise. Additionally, note that the entire page need not be displayed on the display region.
  • a portion of the page may be displayed and a scrolling capability provided to allow the user to scroll up, down, left or right to read other portions of the page.
  • a magnification and reduction capability may be provided to allow the user to change the size of the text or images. This may be desirable for users with reduced vision, for example. Discussion of control scheme As indicated at the outset, electrophoretic and other bi-stable displays must be addressed and controlled in a different way than other displays such as LCDs because of their sensitivity to both the driving voltage amplitude/pulse width and the voltage signs, the relatively long switching or update time for monochrome mode updates, the even longer update time for greyscale mode updates, and sensitivity to image history. For example, the shortest image update time of 900ms is achieved for greyscale image transitions.
  • Fig. 5 illustrates an algorithm for controlling a display with multiple image update modes.
  • a display mode may include, for example, a monochrome update (MU) mode 500, a greyscale update (GU) mode 510, an initialization (INIT) mode 520, and a greyscale clear (GC) mode 530.
  • MU monochrome update
  • GUI greyscale update
  • IIT initialization
  • GC greyscale clear
  • a sleep state 540 is a controller state used when waiting for a display update command. The inter- relationship between these four modes is shown. If a mode update request is made, e.g., by logic running at the reading device control 330 (a display command generated by the host), a determination is made at decision block 560 as to whether the elapsed time from the last display refresh (clear sequence) is less than a preset value. If this is true, a determination is made at decision block 570 as to whether a pixel transition flag 'Q' is zero. If all changed pixels have transitions from a monochrome state to a monochrome state, the flag Q will be set to zero). If this is true, MU mode 500 is selected.
  • GU mode 510 is selected. If the decision block 570 is false, GU mode 510 is selected. If the decision block 560 is false, the refresh timer will be cleared at block 550, and GC mode 530 is selected.
  • the MU mode 500 is loaded by the display ASIC, 100 when only monochrome data are updated, which occurs often in a black and white book or in a sub -window.
  • GU mode 510 is used when at least some greyscale data in a display are updated.
  • the total image update time with MU mode 500 is usually about half the GU mode update time.
  • INIT mode 520 is needed when one starts using the display 310 and/or periodically afterwards, such as after every ten minutes of reading.
  • GC mode 530 is an option when the same level of greyscale is not updated and the display may need to be reset after a regular time.
  • each pixel receives one of thirty-two possible waveforms, depending on the data. Sixteen waveforms correspond to even pixel transitions, and sixteen corresponding to odd pixel transitions. With four possible modes, there are one hundred and twenty-eight possible waveforms that may be used to drive each pixel.
  • each pixel receives one of sixteen possible waveforms, and there are sixty- four possible waveforms that may be used to drive each pixel. The number becomes much larger when various temperatures are considered.
  • the present invention accommodates these variables by providing a codification method/format that results in an efficient controller implementation for controlling a display such as an electrophoretic display or other bi-stable display.
  • a dedicated controller such as the ASIC 100 may be provided according to the invention to provide instructions to the display addressing circuit 305 for driving the display 310 based on information stored in the memory 320.
  • Fig. 6 illustrates a data layout in memory.
  • each of the display modes data is retrieved from the memory 320 for use by the ASIC 100 in driving the pixels of the display with appropriate waveforms.
  • one or more frames of waveform data are provided from the memory 320 to the display ASIC 100 for driving the display 310.
  • the waveform data may be laid out in
  • LUTs in different locations in a memory space 600 in the memory 320.
  • This layout may be thought of as a lookup table (LUT), although the data structure is different from a traditional LUT used, for example, in LCDs.
  • a separate block of data is provided for each possible pixel transition.
  • a pixel has one of four greyscale levels, namely black (B), drag grey (DG), light grey (LG), and white (W)
  • B to B, DG, LG, or W there are sixteen possible transitions for a pixel, e.g., B to B, DG, LG, or W; DG to B, DG, LG, or W; LG to B, DG, LG, or W; and W to B, DG, LG, or W.
  • the number of transitions is the square of the number of greyscale levels.
  • the memory space 600 includes a zeroeth LUT 605, a first LUT 610, and additional LUTs up through a fifteenth LUT 615.
  • the zeroeth LUT 605 is designated as a default.
  • the memory space 600 also includes the addresses at which the LUT data is stored. For example, the address for the zeroeth LUT 605 is stored in memory space 635, the address for the first LUT 610 is stored in memory space 640, and so forth, up to the address for the fifteenth LUT, which is stored in memory space 645.
  • a memory space 650 stores controller settings and manufacturing data for the ASIC 100.
  • An LUT select register 670 may be used to select one of the LUTs depending on the pixel transition.
  • the memory 320 may be a non-volatile flash memory, for example.
  • the display ASIC 100 must apply these wavefo ⁇ ns to all display pixels according to the pixel transition. Additionally, the waveforms are applied based on a pixel parity. Pixel parity can minimize undesirable optical effects by treating the pixels in the display odd columns differently than the pixels in the display even columns.
  • the display ASIC 100 reads the temperature and select the appropriate display sequence (collection of frame instructions) from a LUT depending on the temperature and LUT select register value.
  • the display ASIC 100 Before each frame scan is started, the display ASIC 100 reads a 'frame instruction' from an external non- volatile memory, e.g., memory 320, which provides the LUT space.
  • each frame instruction is 11 bytes long.
  • the instruction fields provide the display ASIC 100 with all necessary information about the current frame, including the voltage to be applied for each pixel depending on its transition and the frame timing. Additionally, logic is implemented for memorizing the previous state of each pixel. Based on this codification, the ASIC 100 can be designed to decode and execute this information, generating a sequence of more frames to apply the desired waveform to each pixel.
  • the coded waveform data may be stored in the memory 320 and decoded by the ASIC 100.
  • the waveform data format is a new definition and could be used for all electrophoretic displays, including those using a three-voltage source driver (e.g., -15 V, 0 V, +15 V), independent of display size.
  • the decoded data is then used by the ASIC 100 to drive the display 310.
  • the waveform codification must be related to all pixels in a frame and will be read before each display frame. Also, since the waveforms depend on the display temperature, there is a link structure to implement this dependence.
  • the ASIC 100 uses a minimum 64kbyte flash memory to store the temperature
  • each temperature LUT has 256 temperature ranges, for example, of 1 °C, representing 256 pointers, for each temperature, virtual values between -128 °C up to +127 °C, arranged as shown below. All pointers are represented using two flash bytes in the order MSB, LSB.
  • the location of the default temperature LUT is fixed. It begins at the address 0 and ends at the address IFF (hexadecimal).
  • the flash memory locations from the address DFE0 (hexadecimal) up to address DFFF (hexadecimal) are also fixed and represent 16 address pointers to the 16 possible LUTs in the flash memory.
  • the location between E000 and FFFF are reserved for the controller settings and manufacturing data.
  • Temperature LUT The LUT address below is relative to, e.g., offset from, the base LUT address, which is indicated by the LUT pointers.
  • the relative (rel.) addresses, e.g., offsets, are provided below, in one example.
  • the display should be updated using different waveforms depending on the update mode, which could be monochrome update (MU), greyscale update (GU), initialization (INIT), refresh, etc. Every pointer from the temperature LUT represents the absolute address to a block of 16 pointers, to 16 possible display sequences (modes). As indicated in Fig. 7, a particular sequence 705, 710, 715, 720, 725 and 730 is selected based on the display update mode 750.
  • the data format is the same for all display sequences and includes one or more records of 11 bytes length, in a particular design.
  • the length of the record (frame instruction) can be increased if more than three driver voltages are used.
  • the end of the display sequence may be indicated, e.g., by the two bytes FF, as in the example below.
  • Hardware shaking is an example of a more generic form of driving pulses, known as "hardware driving”.
  • the display is defined to operate in a mode whereby more than one line of the display is supplied with data at the same time, for example by operating more than one driver IC, such as select drivers, in parallel, or by providing multiple simultaneous outputs from a single driver IC.
  • the cascade signals of the display gate drivers will connect the gate drivers in parallel in order to decrease the frame time to a minimum.
  • FF shaking_data_byte FF shaking_data_byte FF shaking_data_byte FFFF
  • Byte ⁇ represents the display row time
  • byte9 represents the delay between two consecutive display frames
  • byte 10 represents the number of frames used for that sequence.
  • the memory space 650 in Fig. 6 may be allocated as follows: Address (hex) Description E000-E1FF Reserved for Controller settings depending on the temperature. E200 PWM value, 0-always low, 128-50% duty cycle, 255-always high. E201 border appearance, 0-black, 1-grayl, 2-gray2, 3 white E202-E3FF Reserved for other Controller settings and manufacturing data. E400-E401 Address Pointer to Flash Program Sequence, used for autotest.
  • the pulse width modulation (PWM) value and the border appearance are copied from the flash memory in two controller registers, and could be changed by the host, writing these registers: - PWM register 0x11 - Border data register 0x12 Border data If a border is provided around the display, the display border is treated as any other display pixel and is updated at the same time with all display pixels.
  • the default display border value is stored in the flash memory at the address E201 hexadecimal.
  • the display border value could be 0,1,2,3 (black, greyl, grey2, white) and is represented by the low nibble of the byte at the address E201.
  • border data register (address register 12 hex).
  • the high nibble of this register is set to 0, after reset.
  • the low nibble of the border data register represents the new border value and the high nibble represents the actual border value.
  • the host is able to write the low nibble of this register, using the controller's command write register (0x10) followed by the address register (0x12) and the data.
  • the high nibble will get the current value of the low nibble, then the low nibble will get the host data. So, this does work like the two images in the memory, keeping the previous and the current display border value.
  • the border data register is written two times with the same value, the display border will be treated as a pixel having no transition. If the low nibble value is not the same with the high nibble value, the border will be treated (updated) as a pixel having a transition from 'high nibble value' to the 'low nibble value'. In this way, we can force the border update in all sequences or only in the refresh sequences. Also, it is possible to change the border value any time we want. While there has been shown and described what are considered to be preferred embodiments of the invention, it will, of course, be understood that various modifications and changes in form or detail could readily be made without departing from the spirit of the invention. It is therefore intended that the invention not be limited to the exact forms described and illustrated, but should be construed to cover all modifications that may fall within the scope of the appended claims

Abstract

Procédé et système de commande d'affichages électrophorétiques et d'autres affichages du type bistable (310). Des données codées (605, 610, 615) permettant de piloter l'affichage sont stockées dans une mémoire (320) pour différentes transitions de pixels et des températures différentes. Les données codées comprennent des informations concernant le niveau de tension et la synchronisation pour différentes transitions de pixels. Une partie (705, 710, 715, 720, 725, 730) des données codées est extraite par un contrôleur (100) tel qu'un circuit ASIC en fonction d'une transition de pixels, d'une température et d'un mode de mise à jour choisis. La partie des données codées, qui peut comprendre des instructions de trames de longueur fixe, est décodée pour fournir des données décodées. Ces données décodées sont utilisées pour produire des formes d'onde de tension permettant de piloter l'affichage.
PCT/IB2004/052092 2003-10-16 2004-10-14 Tables de consultation a formes d'onde de transition de niveaux de gris pour des affichages bistables WO2005038765A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US10/575,518 US20070085819A1 (en) 2004-10-14 2004-10-14 Look-up tables with graylevel transition waveforms for bi-stable display
EP04770254A EP1676258A1 (fr) 2003-10-16 2004-10-14 Tables de consultation a formes d'onde de transition de niveaux de gris pour des affichages bistables
JP2006534898A JP2007508595A (ja) 2003-10-16 2004-10-14 双安定ディスプレイのグレーレベルの遷移波形を含む参照表

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Application Number Priority Date Filing Date Title
US51169103P 2003-10-16 2003-10-16
US60/511,691 2003-10-16

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WO2005038765A1 true WO2005038765A1 (fr) 2005-04-28

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EP (1) EP1676258A1 (fr)
JP (1) JP2007508595A (fr)
KR (1) KR20060128864A (fr)
TW (1) TW200525267A (fr)
WO (1) WO2005038765A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007052202A (ja) * 2005-08-17 2007-03-01 Fuji Xerox Co Ltd メモリ性のある表示媒体の表示駆動装置及び表示駆動方法
US9947256B2 (en) 2014-06-23 2018-04-17 Seiko Epson Corporation Integrated circuit device, electronic apparatus, and control method for electrooptic panel
WO2023167901A1 (fr) * 2022-03-01 2023-09-07 E Ink California, Llc Compensation de température dans des dispositifs d'affichage électro-optiques

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JP2010107924A (ja) * 2008-10-31 2010-05-13 Delta Electronics (Japan) Inc 記憶型表示装置の画面書替え方法
TWI415065B (zh) * 2010-12-31 2013-11-11 Au Optronics Corp 雙穩態顯示器及其面板的驅動方法
JP5754194B2 (ja) * 2011-03-22 2015-07-29 セイコーエプソン株式会社 集積回路装置、電気光学装置及び電子機器

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WO2003044765A2 (fr) * 2001-11-20 2003-05-30 E Ink Corporation Procedes pour piloter des afficheurs electro-optiques bistables

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
JP2007052202A (ja) * 2005-08-17 2007-03-01 Fuji Xerox Co Ltd メモリ性のある表示媒体の表示駆動装置及び表示駆動方法
US9947256B2 (en) 2014-06-23 2018-04-17 Seiko Epson Corporation Integrated circuit device, electronic apparatus, and control method for electrooptic panel
WO2023167901A1 (fr) * 2022-03-01 2023-09-07 E Ink California, Llc Compensation de température dans des dispositifs d'affichage électro-optiques
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TW200525267A (en) 2005-08-01
EP1676258A1 (fr) 2006-07-05
KR20060128864A (ko) 2006-12-14

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