JP2013250406A - Drive device of display medium, drive program of the display medium and display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drive device of a display medium, a drive program of the display medium and a display device capable of preventing color mixture more effectively when any of predetermined group of particles in plural groups of particles is displayed with a single color unlike the case where a voltage is applied to display a color of a predetermined group of particles at a saturated concentration.SOLUTION: The drive device of a display medium includes a voltage application unit that, when any of a predetermined group of particles in the plural groups of particles is displayed with a single color, applies, to the substrates thereacross, a voltage smaller than a voltage to generate an electric field for displaying the single color at a saturated concentration as well as generating an electric field which causes no color mixture with colors of groups of particles different from the predetermined group of particles in the plural groups of particles, on a display medium having a pair of substrates and plural groups of particles with different colors, which are sealed between the substrates including being charged at least two groups being charged to the identical polarity so that the particles moves between the substrates according to the electric field formed between the a pair of substrates.

Description

  The present invention relates to a display medium drive device, a drive program, and a display device.

  Patent Document 1 includes a first electrode, a second electrode, and a liquid sealed between the first electrode and the second electrode. The liquid includes the first electrode and the first electrode. A plurality of types of charged particles that are moved by a voltage applied between the two electrodes are dispersed, and the plurality of types of charged particles include a first color particle, a second color particle, and a third color particle. The first and second color particles have the same charge code, the third color particles have the opposite charge code to the first and second color particles, and the driving voltage of the first color particles Is a first voltage, and the driving voltage of the second color particle is a second voltage higher than the first voltage. An electro-optical device is disclosed.

  Patent Document 2 discloses an electrophoretic display device having an electrophoretic display element in which a dispersion medium containing electrophoretic particles is interposed between a common electrode and a pixel electrode, wherein the common electrode, the pixel electrode, The image rewriting period for rewriting the display of the electrophoretic display element is a reset period, comprising a driving unit that drives the electrophoretic display element by applying a voltage between the control unit and a control unit that controls the driving unit. And an image signal introduction period, and the electrophoretic display device is driven by the first data input pulse and the second data input pulse during the image signal introduction period. ing.

JP 2009-255102 A JP 2007-316594 A

  The present invention provides a display medium driving device, a driving program, and a display device capable of preventing color mixing when displaying the color of any one of a plurality of types of particle groups in a single color. The purpose is to do.

  According to a first aspect of the present invention, there is provided a display medium driving apparatus for each type enclosed between a pair of substrates and the substrates so as to move between the substrates in accordance with an electric field formed between the pair of substrates. For a display medium having a plurality of types of particle groups having different colors and at least two types charged with the same polarity, the color of any one of the plurality of types of particle groups is a single color. When displaying, it is a voltage lower than the voltage for generating an electric field for displaying the single color at a saturated concentration, and the color of another particle group different from the predetermined particle group among the plurality of types of particle groups; Application means for applying a voltage for generating an electric field that does not generate color mixing between the substrates is provided.

  According to a second aspect of the present invention, a color differs for each type enclosed between the substrates so as to move between the substrates in accordance with an electric field formed between the pair of substrates and the pair of substrates, and at least 2 When displaying the color of any one of the plurality of types of particle groups in a single color on a display medium having a plurality of types of particle groups charged to the same polarity, the particles Application means for applying a voltage lower than the movement start voltage of the particle group having a large voltage for generating an electric field for displaying the saturation concentration next to the group between the substrates.

  According to a third aspect of the present invention, when the voltage application unit displays a color mixture of two or more types of particle groups among the plurality of types of particle groups, each of the colors of the two or more types of particle groups is saturated. A voltage for generating an electric field for displaying the concentration is applied between the substrates.

  In the invention according to claim 4, when the application means displays the particle group having a large voltage for generating an electric field for displaying a saturated concentration next to any one of the predetermined particle groups in a single color, After applying a voltage for generating an electric field that displays a color mixture of the color of the particle group and the color of any one of the predetermined particle groups, to display the predetermined particle group at a saturated concentration A voltage equal to or higher than a saturation voltage, which is a voltage for generating an electric field, is applied with a reverse polarity to the voltage for generating the electric field for displaying the mixed colors.

  According to a fifth aspect of the present invention, the display medium includes a dispersion medium that is sealed between the pair of substrates and has a different color from the plurality of types of particle groups.

  According to a sixth aspect of the present invention, there is provided a display medium driving program for causing a computer to function as an application unit constituting the display medium driving device according to any one of the first to fifth aspects.

  According to a seventh aspect of the present invention, there is provided a display device comprising: a pair of substrates, and the colors enclosed between the substrates are different and have the same polarity so as to move between the substrates according to an electric field formed between the pair of substrates. A display medium having a plurality of types of charged particle groups, and the display medium driving device according to any one of claims 1 to 5.

  According to the first, second, sixth, and seventh aspects of the present invention, when the color of any one of a plurality of types of particle groups is displayed in a single color, the color of the predetermined particle group is saturated. Compared with the case where a voltage for displaying is applied, there is an effect that color mixing can be prevented.

  According to the invention of claim 3, when displaying a mixed color of two or more types of particle groups among a plurality of types of particle groups, the voltage for displaying each of the colors of the two or more types of particle groups at a saturated concentration Compared with the case of applying a voltage less than that, there is an effect that the display density of mixed colors can be increased.

  According to invention of Claim 4, when displaying the color of particle groups other than the particle group with the lowest voltage for displaying by a saturated density by a single color, the voltage for displaying the color of the said particle group by a saturated density Compared with the case of applying, there is an effect that color mixing can be prevented.

  According to the fifth aspect of the present invention, there is an effect that the electrophoretic properties of the particles can be improved as compared with the case where the space between the display substrate and the back substrate is made a space.

(A) is a schematic block diagram of a display apparatus, (B) is a block diagram at the time of comprising a control part with a computer. It is a figure which shows the voltage application characteristic of each migrating particle. It is a flowchart of the process performed by a control part. It is a figure for demonstrating the voltage application sequence at the time of applying a voltage. It is the schematic which shows the behavior of the electrophoretic particle according to a voltage application. It is a figure for demonstrating the voltage application sequence at the time of applying a voltage. It is the schematic which shows the behavior of the electrophoretic particle according to a voltage application. It is a figure for demonstrating the voltage application sequence at the time of applying a voltage. It is the schematic which shows the behavior of the electrophoretic particle according to a voltage application. It is the schematic which shows the behavior of the electrophoretic particle according to the voltage application at the time of using the display medium from which a particle diameter differs.

  Embodiments of the present invention will be described below with reference to the drawings. Members having the same functions and functions are given the same reference numbers throughout the drawings, and redundant descriptions may be omitted. In addition, in order to simplify the description, the present embodiment will be described with reference to a diagram that focuses on one cell as appropriate.

  Further, red particles are referred to as red particles R, and cyan particles having a complementary color relationship with red are referred to as cyan particles C. Each particle and its particle group are indicated by the same symbol (symbol).

  FIG. 1A schematically shows a display device according to this embodiment. The display device 100 includes a display medium 10 and a drive device 20 that drives the display medium 10. The driving device 20 controls the voltage application unit 30 that applies a voltage between the display-side electrode 3 and the back-side electrode 4 of the display medium 10 and the voltage application unit 30 according to image information of an image to be displayed on the display medium 10. And a control unit 40. The display-side electrode 3 and the back-side electrode 4 may be external electrodes without being provided on the display substrate 1 and the back-side substrate 2.

  In the display medium 10, a translucent display substrate 1 serving as an image display surface and a back substrate 2 serving as a non-display surface are disposed to face each other with a gap. Further, a gap member 5 is provided that holds the pair of substrates 1 and 2 at a predetermined interval and partitions the substrate into a plurality of cells.

  The cell indicates a region surrounded by the back substrate 2 provided with the back side electrode 4, the display substrate 1 provided with the display side electrode 3, and the gap member 5. In the cell, for example, a dispersion medium 6 made of an insulating liquid and a first particle group 11, a second particle group 12, and a white particle group 13 dispersed in the dispersion medium 6 are enclosed. The cells enclosing the particle groups and the dispersion medium 6 are not limited to this shape as long as they do not cause the deviation in the display surface of the particles, and may be, for example, those encapsulated in microcapsules.

  The first particle group 11 and the second particle group 12 are different in color and charged with the same polarity, and by applying a voltage that generates an electric field higher than a predetermined threshold electric field between the pair of electrodes 3 and 4, Each of the first particle group 11 and the second particle group 12 has a characteristic of migrating independently. On the other hand, the white particle group 13 is less charged than the first particle group 11 and the second particle group 12, and generates an electric field in which the first particle group 11 and the second particle group 12 move to either one of the electrodes. This is a particle group that does not move to any electrode side even when a voltage to be applied is applied between the electrodes.

  Instead of using the white particle group 13, white color may be displayed by mixing a colorant in the dispersion medium 6. Or you may use the white member which the 1st particle group 11 and the 2nd particle group 12 can pass, and this white member is a nonwoven fabric, a porous body, or the particle | grains of the 1st particle group 11 or the 2nd particle group 12. A large number of white particles having a particle diameter sufficiently larger than the diameter may be encapsulated.

  In the present embodiment, the first particles 11 are positively charged electrophoretic particles (cyan particles C) having a cyan color, and the second particles 12 are positively charged electric particles having a red color that is a complementary color of cyan. Although the case of migrating particles (red particles R) will be described, the present invention is not limited to this. What is necessary is just to set suitably the color and particle size of each particle | grain. The voltage value of the voltage applied in the following description is also an example, and is not limited to this, and may be set as appropriate according to the charging polarity, particle size, responsiveness, distance between electrodes, and the like of each particle.

  The drive device 20 (the voltage application unit 30 and the control unit 40) migrates the particle groups 11 and 12 by applying a voltage corresponding to the color displayed between the display side electrode 3 and the back side electrode 4 of the display medium 10. Then, it is attracted to either the display substrate 1 or the back substrate 2 according to the respective charging polarities.

  The voltage application unit 30 is electrically connected to the display side electrode 3 and the back side electrode 4, respectively. Further, the voltage application unit 30 is connected to the control unit 40 so as to exchange signals.

  As shown in FIG. 1B, the control unit 40 is configured as a computer 40, for example. The computer 40 includes a CPU (Central Processing Unit) 40A, a ROM (Read Only Memory) 40B, a RAM (Random Access Memory) 40C, a non-volatile memory 40D, and an input / output interface (I / O) 40E via a bus 40F. The voltage application unit 30 is connected to the I / O 40E. In this case, a program for causing the computer 40 to execute a process for instructing the voltage application unit 30 to apply a voltage necessary for displaying each color, which will be described later, is written in, for example, the nonvolatile memory 40D, and this is read and executed by the CPU 40A. . The program may be provided by a recording medium such as a CD-ROM.

  The voltage application unit 30 is a voltage application device for applying a voltage to the display side electrode 3 and the back side electrode 4, and applies a voltage according to the control of the control unit 40 to the display side electrode 3 and the back side electrode 4. .

  In the present embodiment, a case where the display-side electrode 3 is grounded and a voltage is applied to the back-side electrode 4 will be described as an example.

  In FIG. 2, in the display device 100 according to this embodiment, application necessary for moving positively charged cyan particles C and positively charged red particles R to the display substrate 1 side and the back substrate 2 side. The voltage characteristics are shown. In FIG. 2, the applied voltage characteristic of the cyan particle C is represented by a characteristic 50C, and the applied voltage characteristic of the red particle R is represented by a characteristic 50R. FIG. 2 shows the relationship between the voltage applied to the back side electrode 4 with the display side electrode 3 as the ground (0 V) and the display density by each particle group.

  As shown in FIG. 2, the movement start voltage (threshold voltage) for generating an electric field for starting the movement of the cyan particles C on the back substrate 2 side to the display substrate 1 side is + Vc, and the cyan particles C on the display substrate 1 side. The movement start voltage (threshold voltage) for generating an electric field that starts moving toward the rear substrate 2 is −Vc. Here, the movement start voltage refers to a voltage for generating an electric field in which a particle group existing on the back substrate 2 or the display substrate 1 side starts moving toward the opposite substrate. Accordingly, the cyan particles C on the rear substrate 2 side move to the display substrate 1 side by applying a voltage of + Vc or higher, and the cyan particles C on the display substrate 1 side of the rear substrate 2 move by applying a voltage of −Vc or lower. Move to the side.

  The amount of cyan particles C moved from the back substrate 2 side to the display substrate 1 side changes the voltage value of the applied voltage when, for example, the pulse width (voltage application time) of the applied voltage is the same. (Voltage value modulation). For example, when controlling the amount of cyan particles C moved from the back substrate 2 side to the display substrate 1 side, the pulse width of the applied voltage is the same, and the voltage value is set to an arbitrary voltage value of + Vc or more. The cyan particles C having a particle amount corresponding to the voltage value are moved to the display substrate 1 side, and the C color is displayed according to the particle amount of the cyan particles C located on the display substrate 1 side. Thereby, the gradation display of the cyan particles C is controlled. The same applies to the amount of particles when the cyan particles C on the display substrate 1 side are moved to the back substrate 2 side.

  The movement start voltage (threshold voltage) for generating an electric field for starting movement of the red particles R on the back substrate 2 side to the display substrate 1 side is + Vr, and the red particles R on the display substrate 1 side are on the back substrate 2 side. The movement start voltage for starting to move to -Vr. Accordingly, the red particles R on the rear substrate 2 side move to the display substrate 1 side by applying a voltage of + Vr or higher, and the red particles R on the display substrate 1 side of the rear substrate 2 move by applying a voltage of −Vr or lower. Move to the side. As shown in FIG. 2, | Vc |> | Vr |, and the movement start voltage (threshold voltage) of the cyan particles C is larger than the absolute value of the voltage value of the movement start voltage (threshold voltage) of the red particles R. The absolute value of the voltage value is larger. The movement start voltage (threshold voltage) of the particle is controlled by changing the charge amount of the particle by changing the particle material, the surface coating material of the particle, the additive, the particle diameter, the particle surface shape, the surface area, etc. It can be adjusted by controlling the adhesion force to the surface and the electrostatic force received from the electric field. Alternatively, it can be adjusted using electrostatic attraction generated by charging the particle surface material, substrate surface material, van der Waals force, or the like.

  The amount of red particles R moved from the back substrate 2 side to the display substrate 1 side and the amount of red particles R moved from the display substrate 1 side to the back substrate 2 side are the same as in the case of the cyan particles C described above. For example, when the pulse width of the applied voltage is the same, the voltage value of the applied voltage is controlled.

  In addition, the voltage value of the applied voltage may be the same, and the particle amount of the moving particles may be controlled by changing the pulse width to control the gradation display (pulse width modulation). For example, when controlling the amount of cyan particles C to be moved from the back substrate 2 side to the display substrate 1 side, if the voltage value of the applied voltage is a predetermined voltage value of + Vc or more, the pulse width is long. The amount of cyan particles C moving to the display substrate 1 side increases as the time goes. Accordingly, the gradation display of the cyan particles C is controlled by fixing the voltage value and setting the pulse width to a pulse width having a length corresponding to the gradation. In the present embodiment, as an example, a case will be described in which the amount of moving particles is controlled by voltage value modulation.

  By the way, normal particles have a distribution of particle diameter and shape, or the charge amount is not uniform for all particles due to variations in material composition, etc., and as shown in FIG. The voltage that moves to the 1 side, that is, the saturation voltage + Vr2 that generates an electric field for displaying red at a saturated density, may be higher than the movement start voltage + Vc of the cyan particles C. For this reason, when the saturation voltage + Vr2 is applied to display red with a single color saturation density from a state where all the cyan particles C and red particles R are moved to the back substrate 2 side (white display state), Since the cyan particles C move to the display substrate 1 side, color mixing occurs, and red display may deteriorate.

  Therefore, in the present embodiment, when red is displayed in a single color, a voltage that is less than the saturation voltage + Vr2 and does not cause color mixing with cyan, that is, a voltage that is less than the movement start voltage + Vc of cyan particles C is applied. To do. Thereby, although some red particles R remain on the back substrate 2 side, the movement of some cyan particles C to the display substrate 1 side is suppressed, and the occurrence of color mixing is suppressed.

  Next, as an operation of the present embodiment, control executed by the CPU 40A of the control unit 40 will be described with reference to a flowchart shown in FIG.

  First, in step S10, image information of an image to be displayed on the display medium 100 is acquired from an external device (not shown) via, for example, the I / O 40E.

  In step 12, the voltage application unit 30 is instructed to apply the reset voltage -VR as shown in FIG. Here, the reset voltage −VR is a voltage for moving all the cyan particles C and red particles R to the back substrate 2 side. That is, as shown in FIG. 4, the reset voltage −VR is a voltage (voltage with a high absolute value of the voltage value) lower than the voltage −Vc <b> 2 that generates an electric field at which the cyan particles C have a saturated concentration. For this reason, when the reset voltage −VR is applied to the back electrode 4, all the cyan particles C and red particles R move and adhere to the back substrate 2 side. As a result, as shown in FIG. 5A, white color by the white particles 13 is displayed from the display substrate 1 side. In FIG. 5, the electrodes and the gap member are not shown. The same applies to FIGS.

  In step S <b> 14, the display color voltage to be applied to the back side electrode 4 is determined based on the acquired image information, and the voltage application unit 30 is instructed. The voltage application unit 30 applies the display color voltage instructed by the control unit 40 to the back side electrode 4.

  This display color voltage is a voltage corresponding to the gradation of the color to be displayed on the display medium 100. For example, when performing gradation display of red single color, as shown in FIG. 4, the display color voltage is higher than + Vr which is the movement start voltage of the red particles R and does not generate color mixing with the cyan particles C. The voltage + V1 is less than + Vc. The voltage value of + V1 is a voltage value corresponding to the red tone (density) to be displayed. Note that the voltage values are the same, and gradation control may be performed by the pulse width.

  Therefore, even when red is displayed with, for example, the maximum gradation, the display color voltage + V1 is less than the voltage + Vc at which color mixing with the cyan particles C does not occur. Therefore, as shown in FIG. Although some of the red particles R remain on the back substrate 2 side, all the cyan particles C remain on the back substrate 2 side, so that deterioration of red display can be suppressed.

  Further, when displaying black, which is a secondary color of cyan and red, as shown in FIG. 6, the display color voltage is a voltage at which all cyan particles C and red particles R move to the display substrate 1 side. The voltage + V3 is higher than + Vc2. Therefore, when displaying black, as shown in FIG. 7, all the cyan particles C and red particles R move to the display substrate 1 side, and cyan and red are displayed at a saturated density. Decrease is suppressed. In order to prevent color mixing in color display using two or more kinds of particles, it is also effective to reduce the amount of particles of each color and reduce the overlapping part of display characteristics according to the voltage. However, according to the present embodiment, such a problem can be solved. However, the saturation of the secondary color may be low or the number of gradations may be reduced due to insufficient particle amount.

  In particular, when displaying a secondary color by a complementary color or a black color that is a tertiary color by three-color particles described later, if the balance of the particle amount is lost or the particle is biased, the displayed black color is displayed. However, the color of particles distributed on the display surface appears to be tinged. For example, in a region where many red particles and magenta particles are distributed, the color becomes reddish black, and the display quality deteriorates. According to the present embodiment, even if the color balance of the secondary color and the tertiary color is slightly deviated from the achromatic color, the density is increased if the amount of particles is sufficient, and is recognized as sufficient black in terms of visibility. , Display quality will be higher.

  In the present embodiment, it is desirable to make the particles nearly transparent or to reduce the particle diameter in order to display a good color mixture. This makes it possible to increase the saturation of the secondary color when using a color of three or more particles. Further, in order to sufficiently increase the display saturation of each particle below the saturation concentration of each particle, the amount of the color material contained in the particle and the dispersibility are sufficiently increased. Thereby, the color developability of the particles is increased.

  Further, in the case of performing a cyan monochrome gradation display, the cyan particles C having a particle amount corresponding to the gradation are left on the display substrate 1 side from the black display state shown in FIG. Red particles R are moved to the back substrate 2 side. Therefore, in the case of performing cyan single-color gradation display, as shown in FIG. 8, a voltage −V2 lower than the voltage −Vr2 for moving all the red particles R to the back substrate 2 side is applied. Apply to. The voltage value of −V2 is a voltage value corresponding to the cyan gradation (density) to be displayed. Note that the voltage values are the same, and gradation control may be performed by the pulse width.

  Therefore, even when the cyan color is displayed with, for example, the maximum gradation, the display color voltage −V2 is a voltage lower than the voltage −Vr2 at which color mixing with the red particles R does not occur. Although some of the cyan particles C move to the back substrate 2 side, all the red particles R move to the back substrate 2 side, so that it is possible to suppress deterioration of the cyan display.

  The display device according to the present embodiment has been described above, but the present invention is not limited to the above embodiment.

  For example, although the case where the white particle group is used as the particle group that does not migrate has been described, the present invention is not limited to this, and if the color is different from the first particle group 11 and the second particle group 12, for example, a black particle group is used. Also good.

  Further, in the present embodiment, the case of using two types of color particle groups having the same polarity as the colored particle groups to be migrated has been described. However, three or more types of colors having the same polarity (for example, cyan, magenta, yellow, etc.) are used. Particle groups may be used.

  In the present embodiment, the case where the cyan particles C and the red particles R have the same particle size has been described. However, a plurality of types of particle groups having different particle sizes may be used.

  In particular, as shown in FIGS. 10A and 10B (the operation is the same as in the embodiment shown in FIG. 5), the particle diameters of the particle groups are made different in order to make the movement start voltage (threshold voltage) of the particles different. The larger the particle size, the larger the charge amount, the smaller the movement start voltage (threshold voltage), and the larger the electrostatic force received from the electric field for display, the faster the movement speed between the front and back substrates. For this reason, the degree of color mixing resulting from the overlapping of threshold values is reduced, the saturation of the display color is increased, and the time required for display is generally shortened. In this case, it is more preferable that the particles having a large particle size have transparency because the saturation of the secondary color is increased.

  Incidentally, in the present embodiment, the movement start voltage (threshold voltage) is measured by applying various voltages to the display medium 10 enclosing the particles of the color to be measured, and the color of the particles of the measurement target by the spectroscope. The measurement is performed by measuring the intensity, that is, the concentration of the reflected light of the wavelength. For example, since the wavelength of cyan is about 500 nm, when measuring the relationship between the concentration of cyan particles C and the applied voltage, the intensity of reflected light of this wavelength is measured by a spectroscope. Further, since the wavelength of the red particle R is about 650 nm, when measuring the relationship between the concentration of the red particle R and the applied voltage, the intensity of the reflected light of this wavelength is measured with a spectroscope. Then, a voltage at which, for example, 5% or less of the maximum density (the intensity of reflected light) is measured is defined as a movement start voltage (threshold voltage), and a density of 95% or more of the maximum density is a saturated density, for example. And the voltage at which the saturation concentration is measured is defined as the saturation voltage.

  In this embodiment, the case where the display medium having a configuration in which the dispersion medium is sealed between the substrates is described, but a display medium in which the space between the substrates is a space (gas) may be used.

  The configuration of the display device 20 described in the present embodiment (see FIG. 1) is merely an example, and unnecessary portions may be deleted or new portions may be added without departing from the scope of the present invention. Needless to say.

DESCRIPTION OF SYMBOLS 1 Display substrate 2 Back substrate 3 Display side electrode 4 Back side electrode 5 Gap member 6 Dispersion medium 10 Display medium 11 1st migrating particle (group)
12 Second migrating particles (group)
13 White particles (group)
20 Display medium 30 Voltage application unit 40 Control unit 100 Display device C Cyan particle (group)
R red particles (group)

Claims (7)

A pair of substrates differ in color for each type enclosed between the substrates so as to move between the substrates in accordance with an electric field formed between the pair of substrates, and at least two types are charged with the same polarity. For a display medium having a plurality of types of particle groups,
When displaying the color of any one of the plurality of types of particle groups in a single color, the voltage is less than a voltage for generating an electric field for displaying the single color at a saturated density, and the plurality of types A display medium driving apparatus comprising: an applying unit that applies an electric voltage that generates an electric field that does not generate a color mixture of a color of a particle group different from the predetermined particle group. A pair of substrates differ in color for each type enclosed between the substrates so as to move between the substrates in accordance with an electric field formed between the pair of substrates, and at least two types are charged with the same polarity. For a display medium having a plurality of types of particle groups,
When displaying the color of any one of the plurality of types of particle groups in a single color, the movement of the particle group having a large voltage for generating an electric field for displaying a saturation concentration next to the particle group is started. A display medium driving device comprising application means for applying a voltage lower than the voltage between the substrates. When the voltage application means displays a color mixture of two or more types of particle groups among the plurality of types of particle groups, an electric field for displaying each of the colors of the two or more types of particle groups at a saturated concentration is provided. The display medium driving device according to claim 1, wherein a voltage to be generated is applied between the substrates. The application means, when displaying the particle group having a large voltage for generating an electric field for displaying a saturation concentration next to any one of the predetermined particle groups in a single color, After applying a voltage for generating an electric field for displaying a color mixture with the color of the predetermined particle group, the saturation is a voltage for generating an electric field for displaying one of the predetermined particle groups at a saturated concentration. The display medium driving device according to any one of claims 1 to 3, wherein a voltage equal to or higher than a voltage is applied with a polarity opposite to a voltage that generates an electric field for displaying the mixed colors. 5. The display medium driving device according to claim 1, wherein the display medium includes a dispersion medium enclosed between the pair of substrates and having a color different from the colors of the plurality of types of particle groups.   6. A display medium driving program for causing a computer to function as an application unit that constitutes the display medium driving device according to claim 1. A plurality of types of particle groups charged in the same polarity with different colors sealed between the substrates so as to move between the substrates according to an electric field formed between the pair of substrates; and A display medium having
The display medium driving device according to any one of claims 1 to 5,
A display device comprising: