WO2015118980A1 - Dispositif de commande d'excitation par électrophorèse et procédé de commande d'excitation par électrophorèse - Google Patents

Dispositif de commande d'excitation par électrophorèse et procédé de commande d'excitation par électrophorèse Download PDF

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Publication number
WO2015118980A1
WO2015118980A1 PCT/JP2015/052013 JP2015052013W WO2015118980A1 WO 2015118980 A1 WO2015118980 A1 WO 2015118980A1 JP 2015052013 W JP2015052013 W JP 2015052013W WO 2015118980 A1 WO2015118980 A1 WO 2015118980A1
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WIPO (PCT)
Prior art keywords
voltage
reference electrode
image
electrode
individual electrode
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PCT/JP2015/052013
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English (en)
Japanese (ja)
Inventor
準 小林
英路 村松
健一郎 藤井
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日本電気株式会社
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Publication of WO2015118980A1 publication Critical patent/WO2015118980A1/fr

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    • 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
    • G09G3/2003—Display of colours
    • 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
    • G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
    • 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 present invention relates to an electrophoretic drive control device and an electrophoretic drive control method applied to electrophoretic electronic paper.
  • This application claims priority based on Japanese Patent Application No. 2014-23218 for which it applied to Japan on February 10, 2014, and uses the content here.
  • an electrophoretic electronic paper that displays an image by moving electrophoretic particles in a capsule disposed between two electrodes (for example, a reference electrode and an individual electrode or a pixel electrode) is known.
  • two electrodes for example, a reference electrode and an individual electrode or a pixel electrode
  • the entire screen is once displayed in white, and then a voltage corresponding to the image after rewriting is applied to two electrodes to realize the image rewriting process.
  • Patent Document 1 discloses a technique for reducing afterimages in an electrophoretic display device.
  • no potential difference is applied between the pixel electrode and the common electrode in the first gradation (white) region, and a potential difference is applied only between the pixel electrode and the common electrode in the second gradation (black) region.
  • Japanese Patent Application Laid-Open No. 2004-228620 discloses a technique for satisfactorily performing an image switching process while suppressing an increase in power consumption in an electrophoretic display device.
  • Patent Document 3 discloses a technique that does not cause a local decrease in contrast ratio or afterimage while maintaining DC balance in an electrophoretic display device. Here, long-term reliability and display quality are improved by driving only the pixels to be changed by applying a voltage between the common electrode and the pixel electrode.
  • Patent Document 4 discloses an electrophoretic display device of an active matrix type.
  • the present invention has been made to solve the above-described problems, and an object thereof is to provide an electrophoretic drive control device and an electrophoretic drive control method capable of suppressing screen flicker during image switching in electronic paper. To do.
  • a first aspect of the present invention is an electrophoretic drive control device that controls the display color of a plurality of pixels by applying a voltage to a display unit in which an electrophoretic particle capsule is disposed between a reference electrode and an individual electrode. is there.
  • the electrophoretic drive control device includes an image analysis unit that identifies a common image portion and a difference image portion of the current image and the next image, and display colors for reference electrodes and individual electrodes corresponding to pixels of the common image portion. And a drive unit that applies a voltage that changes the display color with respect to the individual electrodes and a reference electrode corresponding to the pixel of the difference image portion.
  • the electrophoretic drive control device may further include a voltage analysis unit that specifies the polarity of a voltage applied to the reference electrode and the individual electrode based on a potential difference generated between the reference electrode and the individual electrode of the display unit. .
  • a display unit in which an electrophoretic particle capsule is disposed between a reference electrode and an individual electrode, and a plurality of pixels are applied by applying a voltage to the reference electrode and the individual electrode of the display unit.
  • An electrophoretic drive control device for controlling the display color of the image display device.
  • an electrophoretic drive control method for controlling display colors of a plurality of pixels by applying a voltage to a display unit in which an electrophoretic particle capsule is disposed between a reference electrode and an individual electrode. It is.
  • the electrophoretic drive control method the common image portion and the difference image portion of the current image and the next image are specified, and the display color does not change with respect to the reference electrode and the individual electrode corresponding to the pixels of the common image portion.
  • a voltage that changes the display color is applied to the reference electrode and the individual electrode corresponding to the pixels in the difference image portion.
  • the polarity of the voltage applied to the reference electrode and the individual electrode is specified based on the potential difference generated between the reference electrode and the individual electrode of the display unit, and the reference electrode corresponding to the pixel of the common image portion or the difference image portion A voltage to be applied to the individual electrode may be determined.
  • a fourth embodiment of the present invention is a program for implementing an electrophoresis drive control method.
  • the present invention it is possible to reduce flicker on the screen that occurs when the display unit switches from the current image to the next image.
  • the number of electrodes driven by the electrophoretic drive control device can be reduced by mounting a common reference electrode for each electrophoretic particle capsule and individual electrodes for each pixel on the display unit, the image display device can be reduced in size. And power consumption can be reduced.
  • the display color of the common image part is retained and only the display color of the difference image part is selectively changed, the number of times of image switching of the display part can be reduced, and the durability of the display part can be improved. Can do.
  • FIG. 1 is a block diagram showing a minimum configuration of an electrophoretic drive control device (hereinafter referred to as drive control device) 10 according to the present invention.
  • the drive control apparatus 10 includes an image analysis unit 101 and a drive unit 103.
  • the image analysis unit 101 of the drive control device 10 acquires the current image and the next image.
  • the image analysis unit 101 identifies a common image portion and a difference image portion between the current image and the next image.
  • the driving unit 103 applies a voltage that does not change the pixels of the common image portion to the reference electrode and the individual electrodes corresponding to the pixels of the common image portion. Details of the reference electrode and the individual electrode will be described later.
  • FIG. 2 is a block diagram illustrating a configuration of the image display device 1 including the drive control device 10 according to the first embodiment of the present invention.
  • the image display device 1 includes a drive control device 10, a display unit 20, and a storage unit 30.
  • the drive control control device 10 includes an image analysis unit 101, a voltage analysis unit 102, and a drive unit 103.
  • the image analysis unit 101 acquires the current image and the next image.
  • the image analysis unit 101 identifies a common image portion and a difference image portion between the current image and the next image.
  • the voltage analysis unit 102 acquires a notification signal that notifies that the next image has been acquired from the internal mechanism or the external mechanism of the drive control device 10.
  • the voltage analysis unit 102 specifies the polarity of the voltage applied between the reference electrode and the individual electrode arranged to face the reference electrode based on the potential difference generated between the reference electrode and the individual electrode of the display unit 20.
  • the drive unit 103 applies a predetermined voltage between the reference electrode and the individual electrode of the display unit 20.
  • an electrophoretic particle capsule corresponding to each pixel is disposed between the reference electrode and the individual electrode (or pixel electrode).
  • the driving unit 103 applies the electrophoretic particle capsule corresponding to the pixel of the common image portion in which the image analysis unit 101 specifies the voltage having the same polarity as the polarity of the voltage currently applied between the reference electrode and the individual electrode. Applied between the sandwiched reference electrode and the individual electrode.
  • the driving unit 103 applies a voltage so that the potential difference between the reference electrode and the individual electrode holding the electrophoretic particle capsule corresponding to the pixel of the common image portion is zero.
  • the image displayed on the display unit 20 is composed of a plurality of pixels.
  • the driving unit 103 applies a voltage of the same polarity between the reference electrode and the individual electrode that sandwich the electrophoretic particle capsule corresponding to the pixel of the difference image portion specified by the image analysis unit 101. Thereafter, the drive unit 103 applies a voltage determined based on the difference image portion between the reference electrode and the individual electrode that sandwich the electrophoretic particle capsule corresponding to the pixel of the difference image portion.
  • the drive control device 10 controls the display unit 20 to display a predetermined image.
  • the storage unit 30 stores various data necessary for processing of the drive control device 10.
  • FIG. 3 is a schematic diagram showing the internal mechanism of the display unit 20.
  • the display unit 20 is an electrophoretic display.
  • the electrophoretic display includes a plurality of electrode pairs in which two electrodes of a front surface side electrode (that is, a reference electrode) and a back surface side electrode (that is, an individual electrode) are paired.
  • An electrophoretic particle capsule (hereinafter referred to as a capsule) is disposed between the two electrodes of each electrode pair.
  • Each capsule contains negatively charged white electrophoretic particles (hereinafter, white particles) and positively charged black electrophoretic particles (hereinafter, black particles).
  • white particles negatively charged white electrophoretic particles
  • black particles black particles
  • the pixel corresponding to the capsule in the display unit 20 shows white.
  • the voltage is set as shown in the right part of FIG. 3 and the reference electrode is set to Low and the individual electrode is set to High, white particles in the capsule are attracted to the individual electrode, and black particles are attracted to the reference electrode. At this time, the pixel corresponding to the capsule in the display unit 20 is black (or colored).
  • FIG. 4 shows an example of a voltage applied between the reference electrode and the individual electrode of the display unit 20 of the image display device 1.
  • the relationship between the voltages V 1 and V 2 is V 1 > V 2 > 0, and the voltages V 3 and V 4 are set to arbitrary values.
  • Figure 4 and (1a) in the reference electrode and the individual electrodes are connected in parallel, and applying a voltage V 1 -V 2 between the individual electrode and the reference electrode by applying a voltage V 3 to the individual electrodes .
  • the voltage of the individual electrode becomes Low and the voltage of the reference electrode becomes High.
  • the voltage of the reference electrode is low and the voltage of the individual electrode is high (that is, the pixel corresponding to the capsule sandwiched between the reference electrode and the individual electrode is black)
  • the white particles and the black particles in the capsule maintain the state before the applied voltage is changed. That is, the pixel corresponding to the capsule shows black.
  • a plurality of types of voltages are applied between the reference electrode and the individual electrodes in the display unit 20
  • a plurality of types of potential differences may occur between the reference electrode and the individual electrodes.
  • the pixels corresponding to the capsule on the screen of the display unit 20 are white, gray
  • the gradation changes to black.
  • FIG. 5 is a schematic diagram illustrating an example of a common image portion and a difference image portion of the current image and the next image specified by the image analysis unit 101.
  • the image analysis unit 101 reads the current image data and the next image data from the storage unit 30.
  • a pgm (portable gray map, binary) format is used as the gradation image format of the image data.
  • FIG. 5 shows image processing for changing from the current image “L” to the next image “F”.
  • the background is the common image portion
  • the vertical line portion of the image “L” is the common image portion.
  • the two horizontal line portions of the image “F” are difference image portions that are changed from white to black
  • the underline portion of the image “L” is a difference image portion that is changed from black to white.
  • the image analysis unit 101 identifies a difference image between the current image and the next image.
  • the difference image h (x, y) can be defined as a value obtained by subtracting the next image g (x, y) from the current image f (x, y) by obtaining a difference in gradation value for each pixel. . That is, the image analysis unit 101 subtracts the next image g (x, y) from the current image f (x, y) to obtain a difference image f (x, y).
  • the image analysis unit 101 calculates “0” by subtracting “0” from “0” for each pixel of the common image portion of the background. To do.
  • the image analysis unit 101 calculates “0” by subtracting “1” from “1” for each pixel of the common image portion of the figure.
  • the image analysis unit 101 calculates “ ⁇ 1” by subtracting “1” from “0” for each pixel of the difference image when the current image is white and the next image is black.
  • the image analysis unit 101 calculates “1” by subtracting “0” from “1” for each pixel of the difference image portion.
  • the image analysis unit 101 subtracts the next image g (x, y) from the current image f (x, y) and sets “0”.
  • the coordinates on the screen corresponding to the calculated pixel are specified as the common image portion.
  • the image analysis unit 101 subtracts the next image g (x, y) from the current image f (x, y) to change the coordinates on the screen corresponding to the pixel for which “ ⁇ 1” is calculated from white to black.
  • the difference image portion is specified.
  • the image analysis unit 101 subtracts the next image g (x, y) from the current image f (x, y) to change the coordinates on the screen corresponding to the pixel for which “1” is calculated from black to white.
  • the difference image portion is specified.
  • white pixels are “00”
  • light gray pixels are “01”
  • dark gray pixels are “10”
  • black pixels are “11”. ”To define the gradation using a plurality of bits and subtract the next image g (x, y) from the current image f (x, y).
  • FIGS. 6 to 9 are schematic diagrams illustrating examples of voltages applied by the drive unit 103 of the drive control device 10 between the reference electrode and the individual electrodes of the display unit 20.
  • the drive unit 103 includes a voltage having the same polarity as the current voltage or a reference electrode and an individual electrode between the reference electrode and the individual electrode that sandwich the capsule corresponding to the pixel of the common image portion specified by the image analysis unit 101. A voltage is applied so that the potential difference between the two becomes zero.
  • FIG. 6 shows image processing for a common image portion related to a vertical line portion in which the current image “L” and the next image “F” are common.
  • the voltage analysis unit 102 specifies that the current voltage of the reference electrode is Low and the current voltage of the individual electrode is High.
  • the drive unit 103 applies a voltage having the same polarity as the current voltage to the reference electrode and the individual electrode so that the color state of the common image portion does not change, holds the voltage of the reference electrode low, and The voltage is held high (see the upper right side of (1a)).
  • the drive unit 103 sets both the reference electrode and the individual electrode to Low or High voltage so that the potential difference between the reference electrode and the individual electrode is zero (see the middle and lower stages on the right side of (1a)). ).
  • the voltage analysis unit 102 specifies that the current voltages of both the reference electrode and the individual electrodes are Low in the common image portion specified by the image analysis unit 101 as shown in FIG.
  • the drive unit 103 sets the voltage of both the reference electrode and the individual electrode to Low or High so that the potential difference between the reference electrode and the individual electrode becomes zero so that the color state of the common image portion does not change. (Refer to the upper and lower sections on the right side of (1b)).
  • the voltage analysis unit 102 specifies that the current voltages of both the reference electrode and the individual electrode are High in the common image portion specified by the image analysis unit 101.
  • the drive unit 103 sets the voltage of both the reference electrode and the individual electrode to Low or High so that the potential difference between the reference electrode and the individual electrode becomes zero so that the color state of the common image portion does not change. (Refer to the upper and middle sections on the right side of (1c)).
  • FIG. 7 shows image processing for the common image portion related to the background.
  • the voltage analysis unit 102 specifies that the current voltage of the reference electrode is High and the current voltage of the individual electrode is Low.
  • the drive unit 103 applies a voltage having the same polarity as the current voltage to the reference electrode and the individual electrode so that the color state of the common image portion does not change, and sets the voltage of the reference electrode to High and the voltage of the individual electrode. Is set to Low (see the upper right side of (1a)).
  • the drive unit 103 sets the voltage of both the reference electrode and the individual electrode to Low or High so that the potential difference between the reference electrode and the individual electrode becomes zero so that the color state of the common image portion does not change. (Refer to (1a) right middle and lower).
  • the voltage analysis unit 102 specifies that the current voltages of both the reference electrode and the individual electrode are Low in the common image portion specified by the image analysis unit 101 as shown in FIG.
  • the drive unit 103 sets the voltage of both the reference electrode and the individual electrode to Low or High so that the potential difference between the reference electrode and the individual electrode becomes zero so that the color state of the common image portion does not change. (Refer to the upper and lower sections on the right side of (1b)).
  • the voltage analysis unit 102 specifies that the current voltages of both the reference electrode and the individual electrode are High in the common image portion specified by the image analysis unit 101.
  • the drive unit 103 sets the voltage of both the reference electrode and the individual electrode to Low or High so that the potential difference between the reference electrode and the individual electrode becomes zero so that the color state of the common image portion does not change. (Refer to the upper and middle sections on the right side of (1c)).
  • FIG. 8 shows image processing for the difference image portion related to the two horizontal line portions of the image “F” that changes from white to black when the current image “L” is changed to the next image “F”.
  • the voltage analysis unit 102 specifies that the current voltage of the reference electrode is High and the current voltage of the individual electrode is Low in the difference image portion specified by the image analysis unit 101.
  • the driving unit 103 sets the voltage of the reference electrode to Low and the voltage of the individual electrode to High (see the lower left side of (1a)).
  • the drive unit 103 keeps the voltage of the individual electrode at High with the voltage of the reference electrode set to Low so that the color state of the difference image portion changed from white to black does not change (see the upper right side of (1a)).
  • the drive unit 103 sets both the reference electrode and the individual electrode to Low or High so that the potential difference between the reference electrode and the individual electrode is zero so that the color state of the difference image portion does not change ( (Refer to the right middle and bottom of (1a)).
  • the drive unit 103 sets the voltage of the reference electrode to High and the voltage of the individual electrode to Low (see the left middle part of (1b)). After that, the driving unit 103 applies a voltage that makes the difference image portion black, and sets the voltage of the reference electrode to Low and the voltage of the individual electrode to High (see the lower left side of (1b)). The drive unit 103 sets the reference electrode voltage to Low and the individual electrode voltage to High so that the color state of the difference image portion in which the current image is white and the next image is black does not change (in (1b)). (See the upper right).
  • the drive unit 103 sets the voltage of both the reference electrode and the individual electrode to Low or High so that the potential difference between the reference electrode and the individual electrode becomes zero so that the color state of the difference image portion does not change. (Refer to (1b) left middle and lower).
  • the voltage analysis unit 102 specifies that the current voltages of the reference electrode and the individual electrode are both high in the difference image portion specified by the image analysis unit 101.
  • the drive unit 103 sets the voltage of the reference electrode to High and the voltage of the individual electrode to Low (see the left middle part of (1c)).
  • the driving unit 103 applies a voltage that makes the difference image portion black, and sets the voltage of the reference electrode to Low and the voltage of the individual electrode to High (see the lower left side of (1c)).
  • the drive unit 103 sets the reference electrode voltage to Low and the individual electrode voltage to High so that the color state of the difference image portion in which the current image is white and the next image is black does not change (in (1c)).
  • the drive unit 103 sets the voltage of both the reference electrode and the individual electrode to Low or High so that the potential difference between the reference electrode and the individual electrode becomes zero so that the color state of the difference image portion does not change. (Refer to the left middle and bottom of (1c)).
  • FIG. 9 shows image processing for the difference image portion relating to the underlined portion of the image “L” that changes from black to white when the current image “L” is changed to the next image “F”.
  • the voltage analysis unit 102 specifies that the current voltage of the reference electrode is Low and the current voltage of the individual electrode is High in the difference image portion specified by the image analysis unit 101.
  • the drive unit 103 sets the voltage of the reference electrode to High and the voltage of the individual electrode to Low (see the lower left side of (1a)).
  • the drive unit 103 maintains the voltage of the individual electrode at Low by setting the voltage of the reference electrode to High so that the color state of the difference image portion changed from black to white does not change (see the upper right side of (1a)).
  • the drive unit 103 sets both the reference electrode and the individual electrode to Low or High so that the potential difference between the reference electrode and the individual electrode is zero so that the color state of the difference image portion does not change ( (Refer to the right middle and bottom of (1a)).
  • the drive unit 103 applies a voltage that makes the difference image portion white, and sets the voltage of the reference electrode to High and the voltage of the individual electrode to Low (see the lower left side of (1b)).
  • the drive unit 103 sets the voltage of the reference electrode to High and the voltage of the individual electrode to Low so that the color state of the difference image portion in which the current image is black and the next image is white does not change (in (1b)). (See the upper right).
  • the drive unit 103 sets the voltage of both the reference electrode and the individual electrode to Low or High so that the potential difference between the reference electrode and the individual electrode becomes zero so that the color state of the difference image portion does not change. (Refer to (1b) left middle and lower).
  • the voltage analysis unit 102 specifies that the current voltages of the reference electrode and the individual electrode are both high in the difference image portion specified by the image analysis unit 101.
  • the driving unit 103 applies a voltage that makes the difference image portion white, sets the voltage of the reference electrode to High, and sets the voltage of the individual electrode to Low (see the lower left side of (1c)).
  • the driving unit 103 sets the voltage of the reference electrode to High and the voltage of the individual electrode to Low so that the color state of the difference image portion in which the current image is black and the next image is white does not change (in (1c)). (See the upper right).
  • the drive unit 103 sets the voltage of both the reference electrode and the individual electrode to Low or High so that the potential difference between the reference electrode and the individual electrode becomes zero so that the color state of the difference image portion does not change. (Refer to the left middle and bottom of (1c)).
  • FIG. 10 is a flowchart showing image display processing of the image display device 1 including the drive control device 10 according to the first embodiment of the present invention.
  • the image analysis unit 101 of the drive control device 10 acquires current image data from an external device (not shown) and stores it in the storage unit 30.
  • the image analysis unit 101 sequentially acquires the next image data from the external device.
  • the drive control device 10 applies the same voltage to all capsules in the display unit 20 to display the entire screen in white.
  • the image analysis unit 101 executes display control for the next image data acquired from the external device.
  • the voltage analysis unit 102 receives a notification signal that notifies that the image analysis unit 101 has acquired the next image data.
  • the image analysis unit 101 acquires the next image data from the external device (step S1).
  • the image analysis unit 101 stores the next image data in the storage unit 30 (step S2). Further, the image analysis unit 101 outputs a notification signal for notifying that the next image data has been acquired from the external device to the voltage analysis unit 102.
  • the image analysis unit 101 reads out the current image data displayed on the screen of the display unit 20 from the storage unit 30 (step S3).
  • the image analysis unit 101 identifies the common image portion and the difference image portion based on the current image data and the next image data (step S4).
  • the image analysis unit 101 subtracts the next image g (x, y) from the current image f (x, y). Then, the coordinates on the screen corresponding to the pixel for which “0” is calculated are specified as the common image portion.
  • the image analysis unit 101 subtracts the next image g (x, y) from the current image f (x, y) to change the coordinates on the screen corresponding to the pixel for which “ ⁇ 1” is calculated from white to black.
  • the difference image portion is specified.
  • the image analysis unit 101 subtracts the next image g (x, y) from the current image f (x, y) and changes the coordinates on the screen corresponding to the pixel for which “1” is calculated from black to white.
  • the difference image part to be identified is specified. Thereafter, the image analysis unit 101 outputs identification information for identifying the common image portion and the difference image portion to the drive unit 103.
  • the identification information is, for example, a combination of the coordinates (x, y) of each pixel on the screen and the result of subtracting the next image g (x, y) from the current image f (x, y).
  • the drive unit 103 inputs information related to the common image portion and the difference image portion from the image analysis unit 101.
  • the voltage analysis unit 102 inputs a notification signal that notifies the image analysis unit 101 that the next image data has been acquired.
  • the voltage analysis unit 102 specifies the polarity of the applied voltage based on the potential difference between the reference electrode and the individual electrode that are arranged to face each other in the display unit 20 (step S5).
  • the voltage analysis unit 102 acquires voltage information indicating a potential difference between the reference electrode and the individual electrode of the display unit 20 from the driving unit 103.
  • the voltage analysis unit 102 specifies the polarity of the voltage applied between the reference electrode and the individual electrode based on the voltage information.
  • the voltage analysis unit 102 acquires voltage information from a voltmeter (not shown) connected to the reference electrode and the individual electrode in the display unit 20, and calculates the voltage applied between the reference electrode and the individual electrode.
  • the polarity may be specified.
  • the voltage analysis unit 102 obtains the gate voltage of a transistor (not shown) connected to the reference electrode and the individual electrode in the display unit 20 as voltage information, and is applied between the reference electrode and the individual electrode.
  • the polarity of the voltage may be specified.
  • the voltage analysis unit 102 records the polarity of the voltage applied between the reference electrode and the individual electrode (step S6). Further, the voltage analysis unit 102 outputs the polarity of the voltage applied between the reference electrode and the individual electrode to the driving unit 103.
  • the drive unit 103 inputs the polarity of the voltage applied between the reference electrode and the individual electrode from the voltage analysis unit 102. Based on the polarity of the applied voltage and the common image portion and difference image portion between the current image and the next image, the driving unit 103 determines a predetermined voltage for the reference electrode and the individual electrode in the display unit 20. Apply. For example, the driving unit 103 outputs a voltage having the same polarity as the voltage currently applied between the reference electrode and the individual electrode, or a voltage at which the potential difference between the reference electrode and the individual electrode becomes zero. Applied to the reference electrode and the individual electrode corresponding to.
  • the driving unit 103 applies a voltage having the same polarity (for example, a voltage indicating a white image) to the reference electrode and the individual electrode corresponding to the pixels of the difference image portion (step S8). After that, the drive unit 103 individually outputs a voltage having a polarity opposite to the polarity of the voltage currently applied to the reference electrode and the individual electrode (a voltage corresponding to the gradation of the next image in the case of gradation display) separately from the reference electrode. Apply to the electrode (step S9). For example, as described with reference to FIGS. 6 to 9, the driving unit 103 determines the voltage determined based on the relationship between the current applied voltage and the common image portion and the difference image portion between the current image and the next image. Apply to the reference and individual electrodes.
  • a voltage having the same polarity for example, a voltage indicating a white image
  • the drive unit 103 individually outputs a voltage having a polarity opposite to the polarity of the voltage currently applied to the reference electrode and the individual electrode (a
  • pixel coordinate information on the screen and image information may be used. It can.
  • the display unit 20 displays an image corresponding to the voltage applied between the reference electrode and the individual electrode by the driving unit 103 (step S10).
  • the drive control device 10 May skip step S8 in the image display process. In this case, the drive unit 103 executes step S9 after step S7.
  • the drive unit 103 is a voltage having the same polarity as the voltage currently applied between the reference electrode and the individual electrode specified by the voltage analysis unit 102, or a voltage at which the potential difference between the reference electrode and the individual electrode becomes zero. Is applied to the reference electrode and the individual electrode corresponding to the pixel of the common image portion specified by the image analysis unit 101.
  • the image area that the display unit 20 switches from the current image to the next image can be reduced, so that flickers that occur on the screen of the display unit 20 due to image switching can be reduced.
  • the image area to be switched from the current image to the next image can be reduced in the display unit 20
  • the power consumption of the image display device 1 accompanying the image switching can be reduced.
  • the durability time of the display unit 20 can be improved.
  • the driving unit 103 applies the same polarity voltage to the reference electrode and the individual electrode corresponding to the pixels of the difference image portion. Therefore, the variation in gradation when the display unit 20 switches from the current image to the next image can be reduced.
  • Example 2 of the present invention will be described.
  • the second embodiment has the same configuration as that of the first embodiment, and is applied to the image display device 1 including the drive control device 10.
  • FIG. 11 is a schematic diagram illustrating the structure of the display unit 20 of the image display device 1.
  • FIG. 12 is a flowchart showing image display processing according to the second embodiment of the present invention.
  • the display unit 20 of the image display device 1 according to the second embodiment includes a reference electrode and individual electrodes that sandwich a plurality of capsules corresponding to pixels on the screen. As shown in FIG. 11, a common reference electrode and individual electrodes for each capsule are arranged in parallel with respect to a plurality of capsules.
  • the drive unit 103 of the drive control apparatus 10 according to the second embodiment needs to apply a voltage that does not cause a potential difference between the individual electrode corresponding to the pixel of the difference image portion and the reference electrode.
  • the image display process (FIG. 12) according to the second embodiment is the same as the image display process (FIG. 10) according to the first embodiment with respect to steps S1 to S6 and step S10. In the image display process according to the second embodiment, steps S7a to S9a are used instead of steps S7 to S9.
  • the voltage analysis unit 102 outputs the polarity of the voltage applied between the reference electrode and the individual electrode in the display unit 20 to the drive unit 103.
  • the drive unit 103 is configured such that the polarity of the voltage applied between the reference electrode and the individual electrode input from the voltage analysis unit 102, the common image portion between the current image and the next image input from the image analysis unit 101, Based on the difference image portion, a voltage at which the potential difference between the reference electrode and the individual electrode becomes zero is applied to the reference electrode and the individual electrode corresponding to the pixels of the common image portion (step S7a).
  • the drive unit 103 applies a voltage having a polarity opposite to that of the reference electrode to the individual electrode corresponding to the pixel of the difference image portion (step S8a).
  • the drive unit 103 applies a voltage such that the potential difference between the reference electrode and the individual electrode becomes zero to the reference electrode and the individual electrode corresponding to the pixels of the common image portion.
  • Step S9a the driving unit 103 inverts the polarity of the voltage between the reference electrode and the individual electrode corresponding to the pixel whose display color after the execution of Step S8a is to be reversed among the pixels of the difference image portion.
  • the drive unit 103 applies a voltage at which the potential difference becomes zero to the reference electrode and the individual electrode corresponding to the pixels other than the pixel whose display color should be inverted among the pixels of the difference image portion.
  • step S8a when the driving unit 103 applies a voltage that sets the reference electrode voltage to High and the individual electrode voltage to Low, the driving unit 103 sets the individual electrode voltage corresponding to the pixel of the difference image portion to be changed from white to black. And a voltage at which the reference electrode voltage is set to Low is applied.
  • the drive unit 103 uses the same voltage as that of the reference electrode for the individual electrodes corresponding to the pixels other than the pixels in the difference image portion to be changed from white to black.
  • step S9a the drive control device 10 executes step S10.
  • the drive unit 103 sets the reference electrode and the individual electrode for the pixels of the common image portion specified by the image analysis unit 101. A voltage at which the potential difference between them is zero is applied. Thereby, the flicker which generate
  • Example 3 of the present invention will be described.
  • the third embodiment has the same configuration as that of the first embodiment, and is applied to the image display device 1 including the drive control device 10.
  • FIG. 13 is a flowchart showing image display processing according to the third embodiment of the present invention.
  • the display unit 20 of the image display apparatus 1 according to the third embodiment includes a reference electrode common to a plurality of capsules and an individual electrode for each capsule.
  • the image display device No. 1 applies a voltage at which the potential difference becomes zero between the reference electrode and the individual electrode for the pixels of the difference image portion when the image is switched for the difference image portion. And the image display apparatus 1 reverses the polarity of a voltage in a separate step about the difference image part which changes from white to black, and the difference image part which changes from black to white. For this reason, the image display process (FIG. 13) according to the third embodiment is the same as the image display process (FIG.
  • Step S7a (FIG. 12) and steps S8b and S9b are used.
  • the drive unit 103 of the drive control device 10 is currently applied to the reference electrode and the individual electrode specified by the voltage analysis unit 102 with respect to the reference electrode and the individual electrode corresponding to the pixel of the difference image portion specified by the image analysis unit 101. Apply a voltage with the opposite polarity of the current voltage.
  • the drive unit 103 determines the voltage applied to the reference electrode and the individual electrode when step S7a is executed among the individual electrodes corresponding to the pixels of the difference image portion.
  • the polarity of the voltage is reversed with respect to the individual electrode whose display color is reversed (step S8b).
  • the drive unit 103 applies a voltage at which the potential difference between the reference electrode and the individual electrode is zero to pixels other than the pixel whose display color is inverted among the pixels in the difference image portion.
  • step S7a the drive unit 103 reverses the display color when the voltage of the individual electrode is Low when the voltage of the reference electrode is High, and thus the individual electrode corresponding to the pixel of the difference image portion to be changed from black to white Reverse the polarity of the voltage.
  • step S7a the drive unit 103 reverses the display color when the voltage of the individual electrode is High when the voltage of the reference electrode is Low. Therefore, the individual electrode corresponding to the pixel of the difference image portion to be changed from white to black. Reverse the polarity of the voltage.
  • the driving unit 103 inverts the polarity of the voltage of the reference electrode (step S9b). As a result, the display color of the pixels in the difference image portion where the display color was not inverted in step S8b is inverted. On the other hand, the drive unit 103 applies a voltage at which the potential difference between the reference electrode and the individual electrode is zero to the pixels in the common image portion. Thereafter, the drive control device 10 executes Step S10.
  • the drive unit 103 includes a difference image portion that changes from white to black and a difference image portion that changes from black to white. Invert the polarity of the voltage in a separate step. Thereby, when the display color of the part where the image is changed on the screen of the display unit 20 is reversed, the current image can be directly changed to the next image, and thus the image is generated on the screen of the display unit 20. Flickering can be reduced. Further, since the number of electrodes driven by the drive control device 10 is reduced, the drive control device 10 and the image display device 1 can be reduced in size and power consumption can be reduced. Furthermore, since the number of times of image display switching in the display unit 20 is reduced, the durability time of the display unit 20 can be improved.
  • FIG. 14 shows an area (or rewrite area) where the drive control apparatus 10 according to the fourth embodiment of the present invention switches images on the screen of the display unit 20.
  • FIG. 15 is a flowchart illustrating image display processing according to the fourth embodiment of the present invention.
  • the image display device 1 performs a process of switching an image of a predetermined area including the difference image portion.
  • the image display process (FIG. 15) according to the fourth embodiment is the same as the image display process (FIG. 10) of the first embodiment with respect to steps S1 to S6 and step S10, but step S4a is added after step S4.
  • step S7b is used instead of step S7
  • steps S8c and S9c are used instead of steps S8 and S9.
  • the drive unit 103 of the drive control device 10 applies a voltage having the same polarity to the reference electrode and the individual electrode corresponding to pixels in a predetermined region including the difference image portion specified by the image analysis unit 101. Thereafter, the drive unit 103 applies a voltage determined based on the difference image portion specified by the image analysis unit 101 to the reference electrode and the individual electrode.
  • the image analysis unit 101 identifies a predetermined area including the difference image portion (step S4a). For example, the image analysis unit 101 may determine a predetermined region by enlarging the periphery of a predetermined pixel in the difference image portion. Alternatively, the image analysis unit 101 may determine a square area including the difference image portion based on a preset condition. Further, the image analysis unit 101 may track and determine a contour line for a predetermined region including a difference image portion based on a well-known contour line tracking algorithm. For example, the image analysis unit 101 reads out the next image data from the storage unit 30 and narrows down the image data corresponding to the region including the difference image portion.
  • the narrowing down of the image data is performed on an area determined based on a preset condition such as an area enlarged by a predetermined number of pixels from the difference image area or a rectangular area including the difference image portion.
  • the image analysis unit 101 tracks a contour line starting from a pixel of a graphic first detected by raster scanning, assuming a white pixel as a background and a black pixel as a graphic. Then, the image analysis unit 101 stores the x and y coordinates of the start point and the Freeman chain code sequence in the storage unit 30 as the contour data of the image. In this way, the image analysis unit 101 determines a predetermined area including the difference image portion. Thereafter, the image analysis unit 101 outputs identification information that identifies the common image portion and the difference image portion, and identification information that includes coordinate information and color information that identify a predetermined region including the difference image portion, to the drive unit 103.
  • the voltage analysis unit 102 outputs the polarity of the voltage applied between the reference electrode and the individual electrode to the driving unit 103.
  • the driving unit 103 determines the difference image portion based on the polarity of the applied voltage input from the voltage analysis unit 102 and the common image portion and difference image portion of the current image and the next image input from the image analysis unit 101.
  • a voltage at which the potential difference between the reference electrode and the individual electrode is zero is applied to the pixels in the common image portion excluding the predetermined region including the predetermined region (step S7b).
  • the driving unit 103 applies the same voltage having the opposite polarity to the reference electrode to the individual electrodes corresponding to the pixels in the predetermined area including the difference image portion (step S8c). On the other hand, the driving unit 103 applies a voltage at which the potential difference between the reference electrode and the individual electrode becomes zero to the individual electrodes corresponding to the pixels of the common image portion excluding the predetermined region including the difference image portion.
  • the drive unit 103 inverts the polarity of the voltage between the reference electrode and the individual electrode corresponding to the pixel whose display color after execution of Step S8c is to be inverted among the pixels in the predetermined region including the difference image portion (Step S8c). S9c). On the other hand, the driving unit 103 applies a voltage at which the potential difference between the reference electrode and the individual electrode is zero for pixels other than the pixel whose display color should be inverted.
  • the image analysis unit 101 specifies a predetermined region including the difference image portion.
  • the drive unit 103 applies a predetermined voltage between the reference electrode and the individual electrode for pixels in a predetermined region including the difference image portion specified by the image analysis unit 101. Thereby, since the same voltage is applied to the pixels in the predetermined area including the difference image portion, the contrast variation in the predetermined area including the difference image portion on the screen of the display unit 20 can be reduced.
  • FIG. 16 shows a voltage control process after the drive control apparatus 10 according to the embodiment of the present invention switches the image on the screen of the display unit 20.
  • a common reference electrode and five individual electrodes are arranged in five capsules corresponding to five pixels.
  • the voltage of the individual electrode of the fourth capsule from the left is High, but the voltage of the individual electrode is changed to Low by changing the applied voltage.
  • the voltage of only the individual electrode of the left capsule is Low, but the voltage of the individual electrode of the left capsule is changed as the voltage of the common electrode is changed from Low to High by changing the applied voltage.
  • the voltage is also changed from Low to High. Thereby, the display color after pixel rewriting is maintained.
  • the drive unit 103 may perform voltage control processing such that the potential difference between the reference electrode and the individual electrode becomes zero after performing the image rewriting processing. This eliminates the need to separately apply a voltage after rewriting the image, so that the power consumption of the image display device 1 can be reduced.
  • the driving unit 103 may set the potential difference between the reference electrode and the individual electrode to zero so that the number of times of voltage change with respect to the reference electrode and the individual electrode is minimized. For example, the driving unit 103 obtains the number of individual electrodes to which the High voltage is applied and the number of individual electrodes to which the Low voltage is applied based on the voltage control signal.
  • the driving unit 103 compares the number of individual electrodes having a high voltage with the number of individual electrodes having a low voltage, and, as shown in FIG. 16, the high or low voltage applied to many individual electrodes is used as a reference electrode. What is necessary is just to apply to an individual electrode. Thereby, the drive part 103 can reduce the power consumption at the time of changing the voltage applied to a reference electrode and an individual electrode.
  • the storage unit 30 is provided in the image display device 1 according to the above-described embodiment, the storage unit 30 may be provided outside. That is, the storage unit 30 does not have to be directly connected to the drive control device 10 and may be installed in a range where stored information can be transmitted and received. Further, the processing order of the steps in the flowchart of the image display processing according to the above-described embodiment is not limited, and may be changed within an appropriate image rewritable range.
  • the drive control device 10 is provided with a computer system.
  • the above-described processing is stored in a computer-readable recording medium in a program format, and the above-described processing is performed by the computer reading and executing the program.
  • the computer-readable recording medium means a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like.
  • the computer program may be distributed to the computer via a communication line so that the computer executes the program.
  • the above program may be a program for realizing a part of the above functions.
  • the above-described functions may be realized by combining a difference file or a difference program with a program already recorded in the computer system.
  • the present invention reduces flickering on the screen that occurs when switching from the current image to the next image in electrophoretic electronic paper, but its application range is not limited to electronic paper, and various It can be applied to other image display devices.

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  • 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

L'invention concerne un dispositif de commande d'excitation par électrophorèse commandant les couleurs d'affichage de multiples pixels par application d'une tension à une unité d'affichage dans laquelle des capsules de particules électrophorétiques sont agencées entre une électrode de référence et des électrodes individuelles, comportant : une unité d'analyse d'image qui identifie la partie d'image commune et partie d'image différentielle de l'image actuelle et l'image suivante, et une unité d'excitation qui applique une tension aux électrodes individuelles et à l'électrode de référence correspondant aux pixels de la partie d'image commune de sorte que la couleur d'affichage ne change pas, et qui applique une tension aux électrodes individuelles et à l'électrode de référence correspondant aux pixels de la partie d'image différentielle de telle sorte que la couleur d'affichage change. En outre, une unité d'analyse de tension peut également être prévue, laquelle spécifie la polarité de la tension appliquée à l'électrode de référence et aux électrodes individuelles sur la base de la différence de potentiel survenant entre l'électrode de référence et les électrodes individuelles de l'unité d'affichage. Par ce moyen, il est possible de réduire le scintillement de l'écran lors du passage de la présente image à l'autre image sur l'unité d'affichage.
PCT/JP2015/052013 2014-02-10 2015-01-26 Dispositif de commande d'excitation par électrophorèse et procédé de commande d'excitation par électrophorèse WO2015118980A1 (fr)

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Cited By (1)

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CN113450711A (zh) * 2021-06-25 2021-09-28 京东方科技集团股份有限公司 显示装置及其驱动方法，驱动装置

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JP2012118348A (ja) * 2010-12-01 2012-06-21 Seiko Epson Corp 電気泳動表示装置の駆動方法、電気泳動表示装置、及び電子機器
JP2012159786A (ja) * 2011-02-02 2012-08-23 Seiko Epson Corp 制御装置、電気光学装置、電気光学装置の駆動方法および電子機器
JP2012220917A (ja) * 2011-04-14 2012-11-12 Seiko Epson Corp 電気光学装置の制御方法、電気光学装置の制御装置、電気光学装置、及び電子機器

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JP2007206267A (ja) * 2006-01-31 2007-08-16 Seiko Epson Corp 電気泳動表示装置および電子機器
JP2012118348A (ja) * 2010-12-01 2012-06-21 Seiko Epson Corp 電気泳動表示装置の駆動方法、電気泳動表示装置、及び電子機器
JP2012159786A (ja) * 2011-02-02 2012-08-23 Seiko Epson Corp 制御装置、電気光学装置、電気光学装置の駆動方法および電子機器
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Publication number Priority date Publication date Assignee Title
CN113450711A (zh) * 2021-06-25 2021-09-28 京东方科技集团股份有限公司 显示装置及其驱动方法，驱动装置

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