JP2012220917A - Control method of electro-optic device, control device of electro-optic device, electro-optic device, and electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the power consumption in, for example, an electro-optic device employing a matrix driving system.SOLUTION: A control method of an electro-optic device controls a driving unit so that a reference potential (GND) is supplied to all of a plurality of data lines in a period between a first selection period and a second selection period on condition that a first sum (N2V) being the sum of the number of data lines supplied with a low potential (VL) in the first selection period and supplied with a high potential (VH) in the second selection period and the number of data lines supplied with the high potential in the first selection period and supplied with the low potential in the second selection period is larger than a second sum (N0) being the sum of the number of data lines supplied with the low potential in the first selection period and supplied with the low potential in the second selection period and the number of data lines supplied with the high potential in the first selection period and supplied with the high potential in the second selection period.

Description

  The present invention relates to a control method for an electro-optical device such as an electrophoretic display device, a control device for the electro-optical device, an electro-optical device, and an electronic device.

  As an example of this type of electro-optical device, an electrophoretic particle is moved by applying a voltage between a pixel electrode and a counter electrode provided to sandwich an electrophoretic element having a dispersion medium containing the electrophoretic particle. Thus, there is an electrophoretic display (EPD) that displays an image (see, for example, Patent Document 1). The electrophoretic element includes, for example, black particles and white particles as the electrophoretic particles, and these two kinds of particles are selectively attracted to the counter electrode side for each pixel, so that two gradations of black or white are obtained. Is displayed. In such an electrophoretic display device, an image is displayed by supplying a data potential corresponding to a gradation to be displayed to a pixel electrode provided in each of a plurality of pixels. For example, the pixel electrode of the pixel that should display black is supplied with a positive potential (for example, 15 volts) higher than the potential of the counter electrode (for example, 0 volts) as the data potential, and the pixel that should display white An image is displayed on the pixel electrode by supplying a negative potential (for example, −15 volts) lower than the potential of the counter electrode.

  On the other hand, as such an electrophoretic display device, each of a plurality of pixels arranged in a matrix corresponding to the intersection of a plurality of scanning lines and a plurality of data lines intersecting each other serves as a pixel switching element. Active matrix drive type electrophoretic display provided with a pixel circuit (so-called 1T1C type pixel circuit) including a TFT (Thin Film Transistor) and one capacitor (that is, a storage capacitor) that functions as a memory circuit. There is a device (see, for example, Patent Document 1). During operation of such an active matrix drive type electrophoretic display device, a plurality of scanning lines are sequentially selected for each horizontal scanning period, and a data potential is applied to the pixels corresponding to the selected scanning lines via the data lines. Supplied.

JP 2006-267982 A JP 2009-109705 A

  In the electrophoretic display device of the active matrix driving system as described above, the parasitic capacitance of the data line is charged when the potential of the data line is changed according to the data potential every horizontal scanning period in order to rewrite the display image. Therefore, there is a technical problem that a great amount of power may be consumed. For example, the potential of the data line is changed from a positive potential (for example, 15 volts) to a negative potential (for example, -15 volts), or the potential of the data line is changed from a negative potential (for example, -15 volts) to the positive polarity. When the potential is changed to a negative potential (for example, 15 volts), the charging voltage for charging the parasitic capacitance of the data line becomes relatively large, so that the power consumption for charging the parasitic capacitance of the data line may increase. There is.

  SUMMARY An advantage of some aspects of the invention is that it provides an electro-optical device control method, an electro-optical device control device, an electro-optical device, and an electronic apparatus that can reduce power consumption. And

  In order to solve the above-described problem, a control method for an electro-optical device according to the present invention corresponds to a plurality of scanning lines and a plurality of data lines intersecting each other, and an intersection of the plurality of scanning lines and the plurality of data lines. And a driving unit that sequentially selects the plurality of scanning lines and supplies a data potential to the pixel electrodes corresponding to the selected scanning lines via the plurality of data lines. A control method for controlling an electro-optical device, wherein, in a first selection period in which a first scanning line is selected from among the plurality of scanning lines, the pixel electrode corresponding to the first scanning line has the A first control step for controlling the driving unit so that either a high potential higher than a reference potential or a low potential lower than the reference potential is supplied as the data potential via the data line; Previous scan line In a second selection period in which a second scanning line different from the first scanning line is selected next to the first scanning line, the data potential is applied to the pixel electrode corresponding to the second scanning line. A second control step of controlling the driving unit so that either the high potential or the low potential is supplied, and the data potential as the data potential in the first selection period of the plurality of data lines. The number of the data lines to which the low potential is supplied and the high potential is supplied as the data potential in the second selection period, and the data potential in the first selection period among the plurality of data lines. A first sum that is a sum of the number of the data lines to which the high potential is supplied and the low potential is supplied as the data potential in the second selection period is the data line. The number of the data lines to which the low potential is supplied as the data potential in the first selection period and the low potential is supplied as the data potential in the second selection period, and the plurality of data lines Of these, the second potential is the sum of the number of the data lines to which the high potential is supplied as the data potential in the first selection period and the high potential is supplied as the data potential in the second selection period. When the sum is greater than the sum, the driving unit is configured so that the reference potential is supplied to all of the plurality of data lines in a period between the first selection period and the second selection period. And a third control step for controlling.

  The electro-optical device controlled by the control method of the electro-optical device according to the present invention is, for example, an active matrix driving type electrophoretic display device or the like, and each pixel corresponding to the intersection of a plurality of scanning lines and a plurality of data lines. For example, a plurality of pixel electrodes arranged in a matrix and a plurality of scanning lines are sequentially selected, and data is transmitted to the pixel electrodes corresponding to the selected scanning lines via a plurality of data lines. And a driving unit for supplying a potential. The driving unit includes, for example, a scanning line driving circuit that sequentially selects a plurality of scanning lines and a data line driving circuit that supplies a data potential to the plurality of data lines.

  According to the control method of the electro-optical device according to the invention, by performing the first control step, the pixel electrodes corresponding to the first scanning lines (that is, the plurality of pixels arranged along the first scanning lines). For example, by supplying a data potential to a pixel electrode provided in each pixel of the first pixel row) via a plurality of data lines and performing a second control step after the first control step. Pixel electrode corresponding to the second scanning line located adjacent to the scanning line (that is, the pixel provided in each pixel of the second pixel row composed of a plurality of pixels arranged along the second scanning line) A data potential is supplied to the electrode) via a plurality of data lines.

  In the first control step, in a first selection period (for example, a first horizontal scanning period) in which the first scanning line is selected from among the plurality of scanning lines, the pixel electrode corresponding to the first scanning line is applied to the pixel electrode corresponding to the first scanning line. As the data potential, either a high potential (for example, +15 volts) higher than the reference potential (for example, +15 volts) or a low potential (for example, −15 volts) lower than the reference potential is supplied via the data line. Control the drive. Thus, in the first selection period, each of the plurality of data lines has a high potential or a low potential in accordance with the data potential supplied to the pixel electrode electrically connected to the data line. Note that, in the first control process and the second control process, either the reference potential or the high potential and the low potential may be supplied to the pixel electrode via the data line as the data potential.

  In the second control step, in the second selection period in which a second scanning line different from the first scanning line among the plurality of scanning lines is selected next to the first scanning line, the second scanning line The drive unit is controlled so that either the high potential or the low potential is supplied as the data potential to the pixel electrode corresponding to. Therefore, in the second selection period, each of the plurality of data lines has a high potential or a low potential in accordance with the data potential supplied to the pixel electrode electrically connected to the data line.

  Here, if no countermeasure is taken, the pixel electrode to which the data line is electrically connected in the first selection period (in other words, the pixel corresponding to the intersection of the data line and the first scanning line) Provided) and a pixel electrode to which the data line is electrically connected in the second selection period (in other words, provided in a pixel corresponding to the intersection of the data line and the second scanning line). When the supplied data potential differs between the pixel electrode), that is, for example, a low potential is supplied as the data potential to the pixel electrode to which the data line is electrically connected in the first selection period, and the data When a high potential is supplied as a data potential to a pixel electrode to which the line is electrically connected in the second selection period, the potential of the data line is set to a potential (for example, a low potential) in the first selection period. To second There is a possibility that the power consumption for charging the parasitic capacitance of the data lines when changing to a potential (e.g. high potential) in the selection period is increased.

  However, in the present invention, in particular, in the third control step, the low potential is supplied as the data potential in the first selection period and the high potential is supplied as the data potential in the second selection period among the plurality of data lines. The sum of the number of lines and the number of data lines among the plurality of data lines to which a high potential is supplied as a data potential in the first selection period and a low potential is supplied as a data potential in the second selection period. A certain first sum is the number of data lines of which a low potential is supplied as a data potential in the first selection period and a low potential is supplied as a data potential in the second selection period among the plurality of data lines; Among the plurality of data lines, a high potential is supplied as a data potential in the first selection period and a high potential is supplied as a data potential in the second selection period. When the sum is larger than the second sum that is the sum of the number of data lines to be processed, the reference potential is applied to all of the plurality of data lines in the period between the first selection period and the second selection period. The drive is controlled to be supplied.

  That is, in the third control step, when the following relational expression is established, the reference potential (for example, 0 volt) is applied to all of the plurality of data lines in the period between the first selection period and the second selection period. ) Is supplied so as to be supplied.

Relational expression: N2V> N0
However, N2V = N2V_1 + N2V_2
N0 = N0_1 + N0_2
N2V_1 is the number of data lines out of a plurality of data lines to which a low potential is supplied as a data potential in the first selection period and a high potential is supplied as a data potential in the second selection period. N2V_2 is the number of data lines out of a plurality of data lines to which a high potential is supplied as a data potential in the first selection period and a low potential is supplied as a data potential in the second selection period. N0_1 is the number of data lines among the plurality of data lines to which a low potential is supplied as a data potential in the first selection period and a low potential is supplied as a data potential in the second selection period. N0_2 is the number of data lines out of a plurality of data lines to which a high potential is supplied as a data potential in the first selection period and a high potential is supplied as a data potential in the second selection period. N2V is the first sum, and N0 is the second sum.

  In other words, according to the third control step, the data supplied as the data potential among the plurality of data lines is different in the first selection period and the second selection period by the difference in potential between the high potential and the low potential. When the number of lines is larger than the number of data lines in which the potential supplied as the data potential is the same at the high potential or the low potential in the first selection period and the second selection period, the first selection is performed. In the period between the period and the second selection period, the reference potential is supplied to all of the plurality of data lines (in other words, the plurality of data lines between the first selection period and the second selection period. On the other hand, the potential supplied as the data potential differs by the potential difference between the high potential and the low potential in the first selection period and the second selection period. Of the first potential is the potential supplied as the data potential. In the case where the number of data lines is the same at the high potential or the low potential in the period and the second selection period, the above-described reference potential is set between the first selection period and the second selection period. There is no supply period.

  Therefore, for example, when the above-described period for supplying the reference potential is not provided between the first selection period and the second selection period, or between the first selection period and the second selection period. In addition, compared with the case where the period for supplying the reference potential is always provided, the parasitic capacitance of the data line is charged when the data potential is supplied to the pixel electrode through the data line in the second selection period. Therefore, power consumed can be reduced. Therefore, the power consumption of the electro-optical device can be reduced.

  As described above, according to the control method of the electro-optical device according to the present invention, the power consumption of the electro-optical device can be reduced.

  In one aspect of the control method of the electro-optical device according to the invention, the third control step indicates the data potential to be supplied to the pixel electrode corresponding to the first scanning line in the first selection period. By comparing the first data potential information with the second data potential information indicating the data potential to be supplied to the pixel electrode corresponding to the second scanning line in the second selection period, the first data potential information is compared with the first data potential information. A determination step of determining whether or not the sum is greater than the second sum.

  According to this aspect, it is possible to reliably determine whether or not the first sum is larger than the second sum, that is, whether or not the above-described relational expression N2V> N0 is satisfied. Furthermore, the circuit configuration of the circuit for realizing the third control step can be made relatively simple, which is very advantageous in practice.

  In order to solve the above-described problem, a control device for an electro-optical device according to the present invention corresponds to a plurality of scanning lines and a plurality of data lines that intersect with each other, and an intersection of the plurality of scanning lines and the plurality of data lines. And a driving unit that sequentially selects the plurality of scanning lines and supplies a data potential to the pixel electrodes corresponding to the selected scanning lines via the plurality of data lines. A control device for controlling an electro-optical device, wherein the pixel electrode corresponding to the first scan line is connected to the pixel electrode corresponding to the first scan line in the first selection period in which the first scan line is selected from the plurality of scan lines. A first control means for controlling the drive section so that either a high potential higher than a reference potential or a low potential lower than the reference potential is supplied via the data line as the data potential; Previous scan line In a second selection period in which a second scanning line different from the first scanning line is selected next to the first scanning line, the data potential is applied to the pixel electrode corresponding to the second scanning line. As a second control means for controlling the driving unit so that either the high potential or the low potential is supplied, and the data potential as the data potential in the first selection period among the plurality of data lines. The number of the data lines to which the low potential is supplied and the high potential is supplied as the data potential in the second selection period, and the data potential in the first selection period among the plurality of data lines. A first sum that is a sum of the number of the data lines to which the high potential is supplied and the low potential is supplied as the data potential in the second selection period is the data line. The number of the data lines to which the low potential is supplied as the data potential in the first selection period and the low potential is supplied as the data potential in the second selection period, and the plurality of data lines Of these, the second potential is the sum of the number of the data lines to which the high potential is supplied as the data potential in the first selection period and the high potential is supplied as the data potential in the second selection period. When the sum is greater than the sum, the driving unit is configured so that the reference potential is supplied to all of the plurality of data lines in a period between the first selection period and the second selection period. And third control means for controlling.

  According to the control apparatus for an electro-optical device according to the present invention, the power consumption can be reduced in the electro-optical device as in the above-described control method for the electro-optical device according to the present invention.

  The electro-optical device control apparatus according to the present invention can also adopt various aspects similar to the various aspects of the electro-optical device control method according to the present invention described above.

  In order to solve the above problems, an electro-optical device according to the present invention includes the above-described electro-optical device control device according to the present invention (including various aspects thereof).

  According to the electro-optical device according to the present invention, since the control device for the electro-optical device according to the present invention described above is provided, power consumption can be reduced.

  In order to solve the above problems, an electronic apparatus according to the present invention includes the above-described electro-optical device according to the present invention (including various aspects thereof).

  The electronic apparatus according to the present invention includes the above-described electro-optical device according to the present invention, so that a high-quality image can be displayed, for example, a wristwatch, electronic paper, an electronic notebook, a mobile phone, and a portable device. Various electronic devices such as audio devices can be realized.

  The effect | action and other gain of this invention are clarified from the form for implementing invention demonstrated below.

1 is a block diagram illustrating an overall configuration of an electrophoretic display device according to a first embodiment. FIG. 3 is an equivalent circuit diagram illustrating an electrical configuration of a pixel according to the first embodiment. It is a fragmentary sectional view of the display part of the electrophoretic display device concerning a 1st embodiment. It is a schematic diagram which shows the structure of the microcapsule which concerns on 1st Embodiment. It is a top view which shows an example of the image before rewriting, and the image after rewriting. It is a conceptual diagram which shows notionally an example of the data potential information which shows the data potential which should be supplied to each pixel when rewriting an image. It is a conceptual diagram (the 1) for demonstrating the determination method which determines whether GND insertion which concerns on 1st Embodiment is performed. It is a conceptual diagram (the 2) for demonstrating the determination method which determines whether GND insertion which concerns on 1st Embodiment is performed. It is a timing chart which shows an example of GND insertion when the picture in a 1st embodiment is rewritten. It is a table | surface which shows a charging voltage for every combination of the data potential in the horizontal scanning period Tpre, and the data potential in the horizontal scanning period Tcon. It is a table | surface which shows charging energy for every combination of the data potential in horizontal scanning period Tcon, and the data potential in horizontal scanning period Tcon about each when GND insertion is performed and when GND insertion is not performed. It is a perspective view which shows the structure of the electronic paper which is an example of the electronic device to which the electro-optical device is applied. It is a perspective view which shows the structure of the electronic notebook which is an example of the electronic device to which the electro-optical apparatus is applied.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, an electrophoretic display device, which is an example of an electro-optical device according to the invention, is taken as an example.

<First Embodiment>
The electrophoretic display device according to the first embodiment will be described with reference to FIGS.

  First, the overall configuration of the electrophoretic display device according to the present embodiment will be described with reference to FIGS. 1 and 2.

  FIG. 1 is a block diagram showing the overall configuration of the electrophoretic display device according to this embodiment.

  In FIG. 1, an electrophoretic display device 1 according to this embodiment is an active matrix drive type electrophoretic display device, and includes a display unit 3, a controller 10, a scanning line driving circuit 60, a data line driving circuit 70, and the like. And a common potential supply circuit 220. The controller 10 is an example of an “electro-optical device control device” according to the present invention. The scanning line driving circuit 60 and the data line driving circuit 70 constitute an example of the “driving unit” according to the present invention.

  In the display unit 3, m rows × n columns of pixels 20 are arranged in a matrix (in a two-dimensional plane). The display unit 3 includes m scanning lines 40 (that is, scanning lines Y1, Y2,..., Ym) and n data lines 50 (that is, data lines X1, X2,..., Xn). It is provided so as to cross each other. Specifically, the m scanning lines 40 extend in the row direction (that is, the X direction), and the n data lines 50 extend in the column direction (that is, the Y direction). The pixels 20 are arranged corresponding to the intersections of the m scanning lines 40 and the n data lines 50.

  The controller 10 controls operations of the scanning line driving circuit 60, the data line driving circuit 70, and the common potential supply circuit 220. The controller 10 supplies timing signals such as a clock signal and a start pulse to each circuit, for example.

  The scanning line driving circuit 60 sequentially selects m scanning lines 40 by sequentially supplying a scanning signal to each of the scanning lines Y1, Y2,..., Ym under the control of the controller 10.

  The data line driving circuit 70 supplies a data potential to the data lines X1, X2,..., Xn under the control of the controller 10. The data potential is any one of a reference potential GND (for example, 0 volt), a high potential VH (for example, +15 volt), or a low potential VL (for example, -15 volt). In the present embodiment, basically, the data potential of the low potential VL is supplied to the pixel 20 that should display black, and the data potential of the high potential VH to the pixel 20 that displays white. Is supplied.

  The common potential supply circuit 220 supplies a common potential Vcom (in this embodiment, the same potential as the reference potential GND) to the common potential line 93. Note that the common potential Vcom is a potential different from the reference potential GND within a range in which no voltage is substantially generated between the counter electrode 22 supplied with the common potential Vcom and the pixel electrode 21 supplied with the reference potential GND. It may be.

  Note that various signals are input to and output from the controller 10, the scanning line driving circuit 60, the data line driving circuit 70, and the common potential supply circuit 220, but descriptions of those that are not particularly related to the present embodiment are omitted. .

  FIG. 2 is an equivalent circuit diagram illustrating the electrical configuration of the pixel.

  In FIG. 2, the pixel 20 includes a pixel switching transistor 24, a pixel electrode 21, a counter electrode 22, an electrophoretic element 23, and a storage capacitor 27.

  The pixel switching transistor 24 is composed of, for example, an N-type transistor. The pixel switching transistor 24 has a gate electrically connected to the scanning line 40, a source electrically connected to the data line 50, and a drain electrically connected to the pixel electrode 21 and the storage capacitor 27. It is connected to the. The pixel switching transistor 24 applies a data potential supplied from the data line driving circuit 70 (see FIG. 1) via the data line 50 to the pulsed state via the scanning line 40 from the scanning line driving circuit 60 (see FIG. 1). Are output to the pixel electrode 21 and the storage capacitor 27 at a timing corresponding to the scanning signal supplied to the pixel.

  A data potential is supplied to the pixel electrode 21 from the data line driving circuit 70 via the data line 50 and the pixel switching transistor 24. The pixel electrode 21 is disposed so as to face the counter electrode 22 via the electrophoretic element 23.

  The counter electrode 22 is electrically connected to a common potential line 93 to which a common potential Vcom is supplied.

  The electrophoretic element 23 is composed of a plurality of microcapsules each containing electrophoretic particles.

  The storage capacitor 27 is composed of a pair of electrodes arranged opposite to each other with a dielectric film therebetween, one electrode is electrically connected to the pixel electrode 21 and the pixel switching transistor 24, and the other electrode is a common potential line 93. Is electrically connected. The storage capacitor 27 can maintain the data potential for a certain period.

  Next, a specific configuration of the display unit of the electrophoretic display device according to the present embodiment will be described with reference to FIGS. 3 and 4.

  FIG. 3 is a partial cross-sectional view of the display unit of the electrophoretic display device according to this embodiment.

  In FIG. 3, the display unit 3 is configured such that an electrophoretic element 23 is sandwiched between an element substrate 28 and a counter substrate 29. In the present embodiment, description will be made on the assumption that an image is displayed on the counter substrate 29 side.

  The element substrate 28 is a substrate made of, for example, glass or plastic. Although not shown here, the pixel switching transistor 24, the storage capacitor 27, the scanning line 40, the data line 50, the common potential line 93, and the like described above with reference to FIG. 2 are formed on the element substrate 28. A laminated structure is formed. A plurality of pixel electrodes 21 are provided in a matrix on the upper layer side of the stacked structure.

  The counter substrate 29 is a transparent substrate made of, for example, glass or plastic. On the surface of the counter substrate 29 facing the element substrate 28, the counter electrode 22 is formed in a solid shape so as to face the plurality of pixel electrodes 9a. The counter electrode 22 is made of a transparent conductive material such as magnesium silver (MgAg), indium / tin oxide (ITO), indium / zinc oxide (IZO).

  The electrophoretic element 23 is composed of a plurality of microcapsules 80 each including electrophoretic particles, and is fixed between the element substrate 28 and the counter substrate 29 by a binder 30 and an adhesive layer 31 made of, for example, resin. . In the electrophoretic display device 1 according to this embodiment, in the manufacturing process, an electrophoretic sheet in which the electrophoretic element 23 is previously fixed to the counter substrate 29 side by the binder 30 is separately manufactured, such as the pixel electrode 21. It is constituted by being bonded by an adhesive layer 31 to the element substrate 28 side on which is formed.

  One or a plurality of microcapsules 80 are sandwiched between the pixel electrode 21 and the counter electrode 22, and are arranged in one pixel 20 (in other words, with respect to one pixel electrode 21).

  FIG. 4 is a schematic diagram showing the configuration of the microcapsule. In addition, in FIG. 4, the cross section of the microcapsule is shown typically.

  In FIG. 4, the microcapsule 80 is formed by enclosing a dispersion medium 81, a plurality of white particles 82, and a plurality of black particles 83 inside a coating 85. The microcapsule 80 is formed in a spherical shape having a particle size of about 50 μm, for example.

  The coating 85 functions as an outer shell of the microcapsule 80 and is formed of a translucent polymer resin such as acrylic resin such as polymethyl methacrylate and polyethyl methacrylate, urea resin, gum arabic, and gelatin. .

  The dispersion medium 81 is a medium for dispersing the white particles 82 and the black particles 83 in the microcapsules 80 (in other words, in the coating 85). Examples of the dispersion medium 81 include water, alcohol solvents such as methanol, ethanol, isopropanol, butanol, octanol, and methyl cellosolve, various esters such as ethyl acetate and butyl acetate, and ketones such as acetone, methyl ethyl ketone, and methyl isobutyl ketone. , Aliphatic hydrocarbons such as pentane, hexane and octane, alicyclic hydrocarbons such as cyclohexane and methylcyclohexane, benzene, toluene, xylene, hexylbenzene, hebutylbenzene, octylbenzene, nonylbenzene, decylbenzene, undecyl Aromatic hydrocarbons such as benzenes with long chain alkyl groups such as benzene, dodecylbenzene, tridecylbenzene, tetradecylbenzene, etc., halo such as methylene chloride, chloroform, carbon tetrachloride, 1,2-dichloroethane, etc. Emissions of hydrocarbons, carboxylate or other oils may be used singly or as a mixture. In addition, a surfactant may be added to the dispersion medium 81.

  The white particles 82 are particles (polymer or colloid) made of a white pigment such as titanium dioxide, zinc white (zinc oxide), and antimony trioxide, and are negatively charged, for example.

  The black particles 83 are particles (polymer or colloid) made of a black pigment such as aniline black or carbon black, and are positively charged, for example.

  For this reason, the white particles 82 and the black particles 83 can move in the dispersion medium 81 by the electric field generated by the potential difference between the pixel electrode 21 and the counter electrode 22.

  These pigments include electrolytes, surfactants, metal soaps, resins, rubbers, oils, varnishes, charge control agents composed of particles such as compounds, titanium-based coupling agents, aluminum-based coupling agents, silanes as necessary. A dispersant such as a system coupling agent, a lubricant, a stabilizer, and the like can be added.

  3 and 4, when a voltage is applied between the pixel electrode 21 and the counter electrode 22 so that the potential of the counter electrode 22 is relatively high, the positively charged black particles 83 are While being attracted to the pixel electrode 21 side in the microcapsule 80 by the Coulomb force, the negatively charged white particles 82 are attracted to the counter electrode 22 side in the microcapsule 80 by the Coulomb force. As a result, the white particles 82 gather on the display surface side (that is, the counter electrode 22 side) in the microcapsule 80, and the color of the white particles 82 (that is, white) is displayed on the display surface of the display unit 3. Will be displayed. Conversely, when a voltage is applied between the pixel electrode 21 and the counter electrode 22 so that the potential of the pixel electrode 21 becomes relatively high, the negatively charged white particles 82 are generated by the Coulomb force. While attracted to the electrode 21 side, the positively charged black particles 83 are attracted to the counter electrode 22 side by Coulomb force. As a result, the black particles 83 are collected on the display surface side of the microcapsule 80, and the color of the black particles 83 (that is, black) is displayed on the display surface of the display unit 3.

  In addition, red, green, blue, etc. can be displayed by replacing the pigment used for the white particle 82 and the black particle 83 with pigments, such as red, green, and blue, for example.

  Next, a method for controlling the electrophoretic display device according to the present embodiment will be described with reference to FIGS. In the following, for convenience of explanation, it is assumed that pixels 20 of 3 rows × 7 columns are arranged in a matrix on the display unit 3 (see FIG. 1). That is, in the following, m = 3 and n = 7, and the display unit 3 has three scanning lines 40 (that is, scanning lines Y1, Y2, and Y3) and seven data lines 50 (that is, data lines X1,. In the following description, X2,..., X7) are provided so as to intersect each other.

  FIG. 5 is a plan view showing an example of the image P1 before rewriting and the image P2 after rewriting.

  Below, as shown in FIG. 5, the control method of the electrophoretic display device 1 described above will be described, taking as an example the case where the image displayed on the display unit 3 is rewritten from the image P1 to the image P2. Each of the images P1 and P2 is a two-gradation image composed of two gradations of black and white.

  In the present embodiment, when the image P1 displayed on the display unit 3 is rewritten to the image P2, the high potential VH is supplied to the pixel electrode 21 as the data potential for the pixel 20 whose gradation should be changed from white to black. For the pixel 20 whose gradation is to be changed from black to white, the pixel electrode 21 is supplied with the low potential VL as the data potential, and the gradation is not changed (that is, the gradation should be kept black or white). For the reference numeral 20, the reference potential GND is supplied to the pixel electrode 21 as the data potential. Thereby, in the pixel 20 whose gradation should be changed from white to black, the black particles 83 are gathered on the display surface side (that is, the counter electrode 22 side) and black is displayed, and the gradation should be changed from black to white. In the pixel 20, white particles 82 gather on the display surface side to display white, and in the pixel 20 that does not change the gradation, the white particles 82 and the black particles 83 move little or not, and the gradation is black or white. Maintained.

  FIG. 6 is a conceptual diagram conceptually showing data potential information 900 indicating the data potential to be supplied to each pixel 20 when the image P1 displayed on the display unit 3 is rewritten to the image P2.

  In FIG. 6, data potential information 900 is information (or electronic data) indicating the data potential to be supplied to each pixel 20 when the image P1 is rewritten to the image P2, and the gradation data related to the image P1 and the image P2 It is generated by the controller 10 based on the gradation data. The data potential information 900 includes a plurality of pixel potential data 920 indicating data potentials to be supplied to each of the plurality of pixels 20. The pixel potential data 920 is information indicating a data potential to be supplied to the corresponding pixel 20.

  5 and 6, when the image P1 displayed on the display unit 3 is rewritten to the image P2, for example, pixels in the first row-first column, the first row-second column, and the first row-fourth column. 20, the pixel electrode 21 is supplied with the high potential VH as the data potential. For the pixels 20 in the first row-fifth column and the first row-sixth column, the pixel electrode 21 has the low potential VL as the data potential. For the pixels 20 in the first row-third column and the first row-seventh column, the reference potential GND is supplied as the data potential to the pixel electrode 21, and the second row-third column, second row- For the pixels 20 in the fourth column, second row-fifth column, and second row-sixth column, the high potential VH is supplied to the pixel electrode 21 as the data potential, and the second row-first column and second row -For the pixel 20 in the second column, the low potential VL is supplied to the pixel electrode 21 as the data potential. For the pixels 20 in the second row to the seventh column, the reference potential GND is supplied as the data potential to the pixel electrode 21, and for the pixels 20 in the third row to the seventh column, the high potential VH as the data potential to the pixel electrode 21. For the pixels 20 in the third row-first column, the third row-second column, and the third row-sixth column, the low potential VL is supplied as the data potential to the pixel electrode 21, and the third row -For the pixels 20 in the third column, third row-fourth column, and third row-fifth column, the reference potential GND is supplied to the pixel electrode 21 as the data potential.

  In the present embodiment, when the image displayed on the display unit 3 is rewritten, the scanning lines Y1, Y2, and Y3 are selected by the scanning line driving circuit 60 in this order by one horizontal scanning period that is a predetermined period (that is, And a scanning signal having a pulse width corresponding to one horizontal scanning period is sequentially supplied to the scanning lines Y1, Y2, and Y3), and in the horizontal scanning period Th1 in which the scanning line Y1 is selected, the scanning line Y1 The data to be supplied to the pixel electrodes 21 of the pixels 20 in the first row corresponding to (namely, the first row-first column, the first row-second column, ..., the first row-seventh column pixel 20). A potential is supplied to each of the data lines X1,..., X7 by the data line driving circuit 70, and in the horizontal scanning period Th2 in which the scanning line Y2 is selected, the pixels 20 in the second row corresponding to the scanning line Y2 (ie, the scanning line Y2). , Second row-first , Second row-second column,..., Second row-seventh column of pixels 20) are supplied with data potentials by the data line driving circuit 70 in each of the data lines X1,. In the horizontal scanning period Th3 that is supplied and the scanning line Y3 is selected, the pixels 20 in the third row corresponding to the scanning line Y3 (that is, the third row-first column, the third row-second column,. The data potential to be supplied to the pixel electrode 21 of the pixel 20) in the third row-seventh column is supplied by the data line driving circuit 70 to each of the data lines X1,. As a result, the data potential is supplied from the data line 50 to the pixel electrode 21 through the pixel switching transistor 24 that is turned on by the supply of the scanning signal.

  In the present embodiment, in particular, in order to rewrite the image displayed on the display unit 3, the scanning lines Y1, Y2, and Y3 are selected in this order by one horizontal scanning period, and the pixels 20 corresponding to the selected scanning line 40 are selected. When the data potential is supplied every time, “GND insertion” for supplying the reference potential GND to all the data lines 50 is appropriately performed before the data potential is supplied.

  That is, among the data lines X1,..., X7, the low potential VL is supplied as the data potential in the first horizontal scanning period and the high potential VH is supplied as the data potential in the second horizontal scanning period. The data line 50 is supplied with the high potential VH as the data potential in the first horizontal scanning period and the low potential VL as the data potential in the second horizontal scanning period among the data lines X1,. The value N2V, which is the sum of the two, is supplied with the low potential VL as the data potential in the first horizontal scanning period of the data lines X1,..., X7 and the low potential as the data potential in the second horizontal scanning period. The high potential VH is supplied as the data potential in the first horizontal scanning period among the number of data lines 50 to which VL is supplied and the data lines X1,. In the second horizontal scanning period, when the value is larger than the value N0 which is the sum of the number of data lines 50 to which the high potential VH is supplied as the data potential, the first horizontal scanning period and the second horizontal scanning are performed. In the period between the periods, GND insertion is performed (that is, the reference potential GND is supplied to all the data lines 50). In other words, before the data potential is supplied to the data lines 50 in the second horizontal scanning period. Then, precharge is performed with all the data lines 50 set to the reference potential GND.

  That is, particularly in the present embodiment, GND insertion is performed when the following relational expression (1) is satisfied, and GND insertion is not performed when the following relational expression (1) is not satisfied.

N2V> N0 (1)
Specifically, the controller 10 determines whether or not the relational expression (1) is satisfied based on the data potential information 900, and performs the GND insertion only when it is determined that the relational expression (1) is satisfied. Thus, the data line driving circuit 70 is controlled.

  7 and 8 are conceptual diagrams for explaining a determination method for determining whether or not to perform GND insertion. FIG. 7 shows an example in which it is determined whether or not GND insertion is performed between the horizontal scanning period Th1 in which the scanning line Y1 is selected and the horizontal scanning period Th2 in which the scanning line Y2 is selected. FIG. 8 shows an example of determining whether or not to insert GND between the horizontal scanning period Th2 in which the scanning line Y2 is selected and the horizontal scanning period Th3 in which the scanning line Y3 is selected. Yes. Hereinafter, it is assumed that the reference potential GND is 0 volts, the high potential VH is + V volts (for example, +15 volts), and the low potential VL is −V volts (for example, −15 volts).

  In FIG. 7, when the controller 10 controls the data line driving circuit 60 and the scanning driving circuit 70 so as to supply the data potential indicated by the data potential information 900 to each pixel 20, the controller 10 applies the scanning line Y1 in the horizontal scanning period Th1. Based on the pixel potential data 920_1 indicating the data potential to be supplied to the corresponding pixel 20 and the pixel potential data 920_2 indicating the data potential to be supplied to the pixel 20 corresponding to the scanning line Y2 in the horizontal scanning period Th2. Every 50, the difference between the pixel potential data 920_1 and the pixel potential data 920_2 (that is, the data potential to be supplied to the pixel 20 corresponding to the scanning line Y1 and the data potential to be supplied to the pixel 20 corresponding to the scanning line Y2). Difference), in other words, for each of the data lines X1,..., X7, the horizontal scanning period Th2 is calculated. It calculates a change amount of a change in potential relative to the horizontal scanning period Th1 by the Oite data potential is supplied.

  As shown in FIG. 7, the difference between the pixel potential data 920_1 and the pixel potential data 920_2 is 2 V volts (for example, 30 volts) for the data lines X1, X2, X5, and X6, and V for the data line X3. The data lines X4 and X7 are 0 volts (for example, 15 volts).

  Here, the number of data lines 50 in which the difference between the pixel potential data 920_1 and the pixel potential data 920_2 is 2V volts (“4” in the example of FIG. 7) matches the above-described value N2V, and the pixel potential data 920_1. The number of data lines 50 excluding the data lines 50 to which the reference potential GND is supplied in the horizontal scanning periods Th1 and Th2 among the data lines 50 in which the difference between the pixel potential data 920_2 and the pixel potential data 920_2 is 0 volts (in the example of FIG. 7, “1”) matches the aforementioned value N0. Therefore, the controller 10 determines whether the relational expression (1) is satisfied with N2V = 4 and N0 = 1. Therefore, in the example of FIG. 7, the controller 10 determines that the relational expression (1) is satisfied, and performs GND insertion in the period between the horizontal scanning period Th1 and the horizontal scanning period Th2.

  In FIG. 8, when the controller 10 controls the data line driving circuit 60 and the scanning driving circuit 70 so as to supply the data potential indicated by the data potential information 900 to each pixel 20, the controller 10 applies the scanning line Y2 in the horizontal scanning period Th2. Based on the pixel potential data 920_2 indicating the data potential to be supplied to the corresponding pixel 20, and the pixel potential data 920_3 indicating the data potential to be supplied to the pixel 20 corresponding to the scanning line Y3 in the horizontal scanning period Th3. Every 50, the difference between the pixel potential data 920_2 and the pixel potential data 920_3 (that is, the data potential to be supplied to the pixel 20 corresponding to the scanning line Y2 and the data potential to be supplied to the pixel 20 corresponding to the scanning line Y3). Difference), in other words, for each of the data lines X1,..., X7, the horizontal scanning period Th3. It calculates a change amount of a change in potential relative to the horizontal scanning period Th2 by the Oite data potential is supplied.

  As shown in FIG. 8, the difference between the pixel potential data 920_2 and the pixel potential data 920_3 is 0 volt for the data lines X1 and X2, and V volt (for the data lines X3, X4, X5, and X7). For example, the data line X6 is 2V volts (for example, 30 volts).

  Here, the number of data lines 50 (“1” in the example of FIG. 8) in which the difference between the pixel potential data 920_2 and the pixel potential data 920_3 is 2V volts matches the above-described value N2V, and the pixel potential data 920_2. The number of data lines 50 excluding the data lines 50 to which the reference potential GND is supplied in the horizontal scanning periods Th1 and Th2 among the data lines 50 in which the difference between the pixel potential data 920_3 is 0 volts (in the example of FIG. 8, “2”) matches the aforementioned value N0. Therefore, the controller 10 determines whether the relational expression (1) is satisfied with N2V = 1 and N0 = 2. Therefore, in the example of FIG. 8, the controller 10 determines that the relational expression (1) is not satisfied, and does not perform the GND insertion in the period between the horizontal scanning period Th2 and the horizontal scanning period Th3.

  FIG. 9 is a timing chart showing an example of GND insertion when the image P1 displayed on the display unit 3 is rewritten to the image P2. FIG. 9 shows a change with time of the potentials of the scanning lines Y1, Y2, and Y3 and a change with time of the potential of the data line X5. The data line 50 other than the data line X5 (that is, the data lines X1, X2, X3, X4, X6, and X7) is also inserted into the GND similarly to the data line X5.

  In FIG. 9, particularly in the present embodiment, when the image P1 displayed on the display unit 3 is rewritten to the image P2, the horizontal scanning period Th1 in which the scanning line Y1 is selected and the horizontal scanning period Th2 in which the scanning line Y2 is selected. GND is inserted during the period Tp between and the potential of the data line X5 becomes the reference potential GND, and during the period Tn between the horizontal scanning period Th2 and the horizontal scanning period Th3 in which the scanning line Y3 is selected, GND is inserted. Insertion is not performed, and the potential of the data line X5 is maintained as the potential in the horizontal scanning period Th2 (ie, the high potential VH).

  As described above with reference to FIG. 7, the controller 10 calculates the difference between the pixel potential data 920_1 and the pixel potential data 920_2, determines that the relational expression (1) is satisfied, and determines that the horizontal scanning period Th1 and the horizontal potential are horizontal. The GND insertion is performed in a period Tp between the scanning period Th2. Further, as described above with reference to FIG. 8, the difference between the pixel potential data 920_2 and the pixel potential data 920_3 is calculated, it is determined that the relational expression (1) is not satisfied, and the horizontal scanning period Th2 and the horizontal scanning period Th3 are determined. During the period Tn between the two, GND insertion is not performed.

  As described above, in the present embodiment, the GND insertion is appropriately performed depending on whether or not the relational expression (1) is satisfied. For example, when the GND insertion is not performed at all, or two consecutive horizontal scans are performed. Compared to the case where GND insertion is always performed in the period between the periods, the parasitic capacitance of the data line 50 is charged when the data potential is supplied to the pixel electrode 21 through the data line 50 in the horizontal scanning period. Power consumption can be reduced. Therefore, according to the electrophoretic display device 1 according to the present embodiment, the power consumption of the electrophoretic display device 1 can be reduced.

  Next, effects of the control method of the electrophoretic display device 1 according to the present embodiment will be described with reference to FIGS. 10 and 11.

  FIG. 10 illustrates a charging voltage applied to the parasitic capacitance of the data line 50 when the data potential is supplied to the data line 50 in the horizontal scanning period Tcon (that is, the data line driving circuit 70 charges the parasitic capacitance of the data line 50. Is a table showing the data potential in the horizontal scanning period Tpre immediately before the horizontal scanning period Tcon and the combination of the data potential in the horizontal scanning period Tcon. FIG. 10A shows a charging voltage when GND insertion is performed, and FIG. 10B shows a charging voltage when GND insertion is not performed. In FIG. 10, the high potential VH is + V volts (for example, +15 volts), the low potential VH is −V volts (for example, −15 volts), and the reference potential GND is 0 volts.

  In FIG. 10A, when GND insertion is performed during the period between the horizontal scanning period Tpre and the horizontal scanning period Tcon, the potentials of all the data lines 50 are the reference potential GND before the horizontal scanning period Tcon. The charging voltage is the same voltage as the difference between the data potential and the reference potential GND in the horizontal scanning period Tcon, and is not related to the potential of the data line 50 in the horizontal scanning period Tpre.

  That is, when GND insertion is performed during the period between the horizontal scanning period Tpre and the horizontal scanning period Tcon, when the data potential in the horizontal scanning period Tcon is the high potential VH, the charging voltage is + V volts (for example, +15 volts). When the data potential in the horizontal scanning period Tcon is the low potential VL, the charging voltage is −V volts (for example, −15 volts), and when the data potential in the horizontal scanning period Tcon is the reference potential GND, the charging voltage is 0 volts. is there.

  In FIG. 10B, when GND insertion is not performed in the period between the horizontal scanning period Tpre and the horizontal scanning period Tcon, the potential of the data line 50 before the horizontal scanning period Tcon is the data potential in the horizontal scanning period Tpre. Therefore, the charging voltage is basically the same voltage as the difference between the data potential in the horizontal scanning period Tcon and the data potential in the horizontal scanning period Tpre. However, when the data potential in the horizontal scanning period Tcon is the reference potential GND, the data line 50 is electrically connected to the reference potential line set to the reference potential GND and discharged, so that the charging voltage by the data line driving circuit 70 is 0 volts.

  That is, when the GND insertion is not performed in the period between the horizontal scanning period Tpre and the horizontal scanning period Tcon, the data potential in the horizontal scanning period Tpre is the low potential VL and the data potential in the horizontal scanning period Tcon is the high potential VH. The charging voltage is + 2V volts (for example, +30 volts). When the data potential in the horizontal scanning period Tpre is the high potential VH and the data potential in the horizontal scanning period Tcon is the low potential VL, the charging voltage is -2V volts. When the data potential in the horizontal scanning period Tpre is the reference potential GND (that is, 0 volt) and the data potential in the horizontal scanning period Tcon is the high potential VH, the charging voltage is + V volts (for example, +15 volts) and the data voltage in the horizontal scanning period Tpre The charging voltage is -V volts (for example, -15 volts) when the potential is the reference potential GND (ie, 0 volt) and the data potential in the horizontal scanning period Tcon is the low potential VL, and the charging voltage is otherwise used. Is 0 volts.

  FIG. 11 shows the charging energy (that is, the power consumed to charge the parasitic capacitance of the data line 50) for the horizontal scanning period Tcon for each of the cases where the GND insertion is performed and the case where the GND insertion is not performed. It is a table | surface shown for every combination of the data potential in the last horizontal scanning period Tpre and the data potential in the horizontal scanning period Tcon.

As shown in FIG. 11, when GND insertion is performed during the period between the horizontal scanning period Tpre and the horizontal scanning period Tcon, the charging voltage is the value shown in FIG. When the data potential in the scanning period Tcon is the low potential VL or the high potential VH, if the capacitance value of the parasitic capacitance of the data line 50 is “C”, it is C × VL ² or C × VH ² , and the horizontal scanning period Tcon When the data potential at is the reference potential GND, it is 0 (zero). Here, since VL = −V and VH = + V, C × VL ² = C × VH ² = C × V ² . In the following description, the charging energy value C × V ² is assumed to be “P”, that is, P = C × V ² .

  On the other hand, when GND insertion is not performed in the period between the horizontal scanning period Tpre and the horizontal scanning period Tcon, the charging energy is set to “Vpre” as the data potential in the horizontal scanning period Tpre and the data potential in the horizontal scanning period Tcon. “Vcon” is C × Vcon × (Vcon−Vpre). Therefore, when GND insertion is not performed, the charging energy is the data potential when the data potential in the horizontal scanning period Tpre is the low potential VL, the data potential in the horizontal scanning period Tcon is the high potential VH, and in the horizontal scanning period Tpre. Is the high potential VH and the data potential in the horizontal scanning period Tcon is the low potential VL (that is, the data potential transitions by 2 V volts (for example, 30 volts) between the horizontal scanning period Tpre and the horizontal scanning period Tcon). 2P (that is, twice the value P), the data potential in the horizontal scanning period Tpre is the reference potential GND, the data potential in the horizontal scanning period Tcon is the high potential VH, and the horizontal scanning period. The data potential at Tpre is the reference potential GND, and the data potential at the horizontal scanning period Tcon is When data potential is a low potential VL is P, when the other is 0 (zero).

Here, the power consumption consumed to charge all the parasitic capacitances of the m data lines 50 in the horizontal scanning period Tcon (charging energy for charging the parasitic capacitances of the m data lines 50) is GND. The case where the insertion is performed and the case where the GND insertion is not performed can be calculated by the following equations (2) and (3). The power consumption when GND insertion is performed is “E1”, and the power consumption when GND insertion is not performed is “E2”. “N2v_1” is the number of data lines 50 in which the data potential in the horizontal scanning period Tpre is the low potential VL and the data potential in the horizontal scanning period Tcon is the high potential VH, and “N0_1” is the horizontal scanning period. The number of data lines 50 in which the data potential in Tpre is the low potential VL and the data potential in the horizontal scanning period Tcon is the low potential VL, and “NV_1” is the data potential in the horizontal scanning period Tpre is the reference potential GND. In addition, the number of data lines 50 in which the data potential in the horizontal scanning period Tcon is the high potential VH is “NV_2”. The data potential in the horizontal scanning period Tpre is the reference potential GND and the data potential in the horizontal scanning period Tcon is low. The number of data lines 50 at the potential VL, “0_2” is the number of data lines 50 in which the data potential in the horizontal scanning period Tpre is the low potential VL and the data potential in the horizontal scanning period Tcon is the low potential VL, and “N2V_2” is the data in the horizontal scanning period Tpre. This is the number of data lines 50 whose potential is the high potential VH and whose data potential in the horizontal scanning period Tcon is the low potential VL.
<When GND insertion is performed>
E1 = (N2V_1 + N0_1 + NV_1 + NV_2 + N0_2 + N2V_2) × P
= (N2V + NV + N0) × P (2)
<When GND insertion is not performed>
E2 = (N2V_1 + N2V_2) × 2P + (NV_1 + NV_2) × P
= (2 × N2V + NV) × P (3)
However, in the expressions (2) and (3), N2V = N2V_1 + N2V_2 and NV = NV_1 + NV_2.

  Therefore, the condition for reducing the power consumption E1 when the GND insertion is performed to be smaller than the power consumption E2 when the GND insertion is not performed (that is, the condition for reducing the power consumption by performing the GND insertion) is as follows. The following relational expression (4), that is, relational expression (5) is satisfied.

E1-E2 = (− N2V + N0) <0 (4)
N2V> N0 (5)
That is, as shown by the relational expression (5), the number N2V_1 of data lines 50 in which the data potential in the horizontal scanning period Tpre is the low potential VL and the data potential in the horizontal scanning period Tcon is the high potential VH, and the horizontal scanning period. The value N2V which is the sum of the number N2V_2 of the data lines 50 in which the data potential in Tpre is the high potential VH and the data potential in the horizontal scanning period Tcon is the low potential VL is the data potential in the horizontal scanning period Tpre. The number N0_1 of the data lines 50 whose data potential in the horizontal scanning period Tcon is the low potential VL, the data potential in the horizontal scanning period Tpre is the high potential VH, and the data potential in the horizontal scanning period Tcon is the high potential VH. A value that is the sum of the number N0_2 of data lines 50 By performing GND inserted only if greater than zero, power consumption can be reduced. Here, since the relational expression (5) is the same as the relational expression (1) described above, when the relational expression (1) is satisfied as in the present embodiment, the GND is inserted and the relational expression (1 ) Is not established, the power consumption of the electrophoretic display device 1 can be reliably reduced by not performing GND insertion.

  Further, in this embodiment, in particular, the controller 10 determines whether or not the relational expression (1) is satisfied based on the data potential information 900 as described above, so the circuit configurations for the determination are compared. This can be realized by a simple circuit (for example, a circuit configuration including a comparison circuit that compares the data potentials of two pixel rows), which is very advantageous in practice.

  As described above, according to the electrophoretic display device 1 according to the present invention, the power consumption of the electrophoretic display device 1 can be reduced.

<Electronic equipment>
Next, electronic devices to which the above-described electrophoretic display device is applied will be described with reference to FIGS. Below, the case where the electrophoretic display device described above is applied to electronic paper and electronic notebook is taken as an example.

  FIG. 12 is a perspective view illustrating a configuration of the electronic paper 1400.

  As illustrated in FIG. 12, the electronic paper 1400 includes the electrophoretic display device according to the above-described embodiment as a display unit 1401. The electronic paper 1400 has flexibility, and includes a main body 1402 formed of a rewritable sheet having the same texture and flexibility as conventional paper.

  FIG. 13 is a perspective view showing the configuration of the electronic notebook 1500.

  As shown in FIG. 13, an electronic notebook 1500 is obtained by bundling a plurality of electronic papers 1400 shown in FIG. The cover 1501 includes display data input means (not shown) for inputting display data sent from an external device, for example. Thereby, according to the display data, the display content can be changed or updated while the electronic paper is bundled.

  Since the electronic paper 1400 and the electronic notebook 1500 described above include the electrophoretic display device according to the above-described embodiment, low power consumption and high-quality image display can be performed.

  In addition to these, the electrophoretic display device according to the present embodiment described above can be applied to a display unit of an electronic device such as a wristwatch, a mobile phone, or a portable audio device.

  In addition to the electrophoretic display device, the present invention can also be applied to a display device using an electronic powder fluid.

  The present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit or idea of the invention that can be read from the claims and the entire specification, and an electro-optical device with such a change. The control method, electro-optical device control device, electro-optical device, and electronic apparatus are also included in the technical scope of the present invention.

  DESCRIPTION OF SYMBOLS 3 ... Display part, 10 ... Controller, 20 ... Pixel, 21 ... Pixel electrode, 22 ... Counter electrode, 24 ... Pixel switching transistor, 28 ... Element substrate, 29 ... Counter substrate, 40 ... Scanning line, 50 ... Data line, 60 ... Scanning line drive circuit, 70 ... Data line drive circuit, 82 ... White particles, 83 ... Black particles, 220 ... Common potential supply circuit.

Claims (5)

A plurality of scanning lines and a plurality of data lines intersecting each other, a pixel electrode provided corresponding to the intersection of the plurality of scanning lines and the plurality of data lines, and the plurality of scanning lines are sequentially selected, A control method for controlling an electro-optical device including a driving unit that supplies a data potential to the pixel electrode corresponding to the selected scanning line via the plurality of data lines,
In a first selection period in which the first scanning line is selected from among the plurality of scanning lines, a high potential higher than a reference potential is applied to the pixel electrode corresponding to the first scanning line as the data potential. A first control step of controlling the drive unit so that any of a low potential lower than the reference potential is supplied via the data line;
In a second selection period in which a second scanning line different from the first scanning line among the plurality of scanning lines is selected next to the first scanning line, the second scanning line corresponds to the second scanning line. A second control step of controlling the driving unit so that either the high potential or the low potential is supplied as the data potential to the pixel electrode;
Among the plurality of data lines, the number of the data lines to which the low potential is supplied as the data potential in the first selection period and the high potential is supplied as the data potential in the second selection period; The number of the data lines to which the high potential is supplied as the data potential in the first selection period and the low potential is supplied as the data potential in the second selection period among the plurality of data lines. Of the plurality of data lines is supplied with the low potential as the data potential in the first selection period and the data potential in the second selection period. The number of the data lines to which potential is supplied and the high potential as the data potential in the first selection period among the plurality of data lines. And is greater than a second sum that is the sum of the number of data lines to which the high potential is supplied as the data potential in the second selection period, the first selection period And a third control step of controlling the driving unit so that the reference potential is supplied to all of the plurality of data lines in a period between the second selection period and the second selection period. Control method of optical device.   The third control step includes: first data potential information indicating the data potential to be supplied to the pixel electrode corresponding to the first scan line in the first selection period; and the first control period in the second selection period. Whether or not the first sum is larger than the second sum is compared with the second data potential information indicating the data potential to be supplied to the pixel electrode corresponding to the second scanning line. The method of controlling an electro-optical device according to claim 1, further comprising a determination step of determining. A plurality of scanning lines and a plurality of data lines intersecting each other, a pixel electrode provided corresponding to the intersection of the plurality of scanning lines and the plurality of data lines, and the plurality of scanning lines are sequentially selected, A control device that controls an electro-optical device including a driving unit that supplies a data potential to the pixel electrode corresponding to the selected scanning line via the plurality of data lines;
In a first selection period in which the first scanning line is selected from among the plurality of scanning lines, a high potential higher than a reference potential is applied to the pixel electrode corresponding to the first scanning line as the data potential. First control means for controlling the drive unit such that any of a low potential lower than the reference potential is supplied via the data line;
In a second selection period in which a second scanning line different from the first scanning line among the plurality of scanning lines is selected next to the first scanning line, the second scanning line corresponds to the second scanning line. Second control means for controlling the drive unit so that either the high potential or the low potential is supplied to the pixel electrode as the data potential;
Among the plurality of data lines, the number of the data lines to which the low potential is supplied as the data potential in the first selection period and the high potential is supplied as the data potential in the second selection period; The number of the data lines to which the high potential is supplied as the data potential in the first selection period and the low potential is supplied as the data potential in the second selection period among the plurality of data lines. Of the plurality of data lines is supplied with the low potential as the data potential in the first selection period and the data potential in the second selection period. The number of the data lines to which potential is supplied and the high potential as the data potential in the first selection period among the plurality of data lines. And is greater than a second sum that is the sum of the number of data lines to which the high potential is supplied as the data potential in the second selection period, the first selection period And third control means for controlling the drive unit so that the reference potential is supplied to all of the plurality of data lines in a period between the second selection period and the second selection period. Control device for optical device.   An electro-optical device comprising the control device for an electro-optical device according to claim 3.   An electronic apparatus comprising the electro-optical device according to claim 4.

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