JP2007219005A - Image display medium, image display device and image display method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image display medium which has a simple constitution and permits high resolution and multicolor repetitiously rewriting, and to provide an image display device and an image display method using the image display medium. <P>SOLUTION: The image display medium is provided with: a pair of substrates which have at least a light transmissive property and are disposed oppositely while leaving a gap from each other; colored particle groups which are enclosed between the pair of substrates and have a plurality of colors different from each other; and a first particle group which changes from a charged charging state into non-charging state by irradiation of light of specific wavelengths corresponding to colored particle groups of respective colors. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an image display medium, an image display apparatus, and an image display method, and more particularly to an image display medium, an image display apparatus, and an image display method for displaying an image by moving particles.

  Conventionally, display technologies such as Twisting Ball Display (two-color particle rotation display), electrophoresis, magnetophoresis, thermal rewritable media, and liquid crystal with memory properties have been proposed as repetitively rewritable sheet-like image display media. (For example, Patent Document 1).

  Among the display technologies, Twisting Ball Display, memory-type liquid crystal, etc. are excellent in image memory properties, but the display surface cannot be made sufficiently white display like paper, so that images are displayed. In such a case, there is a problem that it is difficult to visually confirm the distinction between the portion where the image is displayed and the portion where the image is not displayed, that is, the image quality is deteriorated. In addition, the display technology using electrophoresis and magnetophoresis has a memory property of an image and is a technology in which colored particles are dispersed in a white liquid, so that it is excellent for white display but forms an image display portion. The black (color) display has a problem that the white liquid always enters the gap between the colored particles, resulting in a grayish color and poor image quality.

  Further, since the white liquid is sealed inside the image display medium, when the image display medium is removed from the image display apparatus and handled roughly like paper, the white liquid leaks out of the image display medium. There is a fear. Twisting Ball Display also has display memory properties, and oil is present only in the cavities around the particles inside the image display medium, but it is almost solid so that it is relatively easy to form a sheet. However, even if the white-coated hemisphere is perfectly aligned on the display side, the light that enters the gap between the spheres is not reflected and is lost internally, so in principle white display with 100% coverage There is a problem that it is not possible to do so, and it becomes slightly grayish. In addition, since the particle size is required to be smaller than the pixel size, fine particles with different colors must be manufactured for high-resolution display, which requires advanced manufacturing techniques. There is also a problem.

  As a display technology that solves the above problems, as a display technology using toner particles, colored toner particles and white toner particles are sealed between opposing electrode substrates, and colored toner particles, or by an electric field between the electrode substrates, or There has been proposed a display technique in which white toner particles move and adhere to the inside of a display-side substrate to display an image based on the contrast between colored toner particles and white toner particles. This display technology is excellent in that the image display medium is entirely composed of solid, and white and black (color) display can be switched 100% in principle. However, in principle, the above technique is a display technique for obtaining a good two-color contrast. In order to perform multi-color display of two or more colors, pixels divided into CMY and RGB are individually driven. Need to be displayed. Such pixel division has a problem that the display resolution is reduced to 1/3 even with the same number of pixels, the medium configuration is complicated, and each color segment is individually driven, which leads to complicated apparatus. . Furthermore, this has a problem that the cost of the image display medium and the image display device is increased.

USP 6017584

  The present invention has been made in view of the above-described facts, and an object thereof is to provide an image display medium, an image display apparatus, and an image display method that can be repeatedly rewritten with a high resolution and multicolor with a simple configuration. To do.

  In order to achieve the above object, an image display medium according to claim 1 is provided with a plurality of kinds of substrates, a pair of substrates that are at least translucent and disposed to face each other with a gap therebetween, and are enclosed between the pair of substrates. And a first particle group that changes from a charged state to an uncharged state by irradiation with light of a specific wavelength corresponding to the colored particle group of each color.

  The image display medium according to claim 1 is charged by irradiating light of a specific wavelength corresponding to a colored particle group of each color between a pair of substrates that are at least translucent and arranged to face each other with a gap. Since a plurality of types of colored particle groups having different colors from the charged state to the uncharged state are provided, the first particle group in the light irradiation region can be selectively changed from the charged state to the uncharged state by light irradiation. . In the charged state, the first particle group is preferably charged with the same polarity and a substantially uniform charge amount.

  In this way, by forming an electric field between a pair of substrates from the outside, only charged particles can be selectively moved, so that a matrix is applied as in the case of applying a voltage to a position corresponding to a pixel position. An electrode or pixel electrode is not required, and the image display medium can have a simple structure. In addition, since no matrix electrode, pixel electrode, or the like is used, the resolution of the image is not limited by the electrode resolution, and higher-resolution image display can be realized.

  In addition, by using the first particle group consisting of the colored particle group that is changed from the charged state to the uncharged state charged by irradiation with light of a specific wavelength, only the colored particles unnecessary for display are removed, and the colored particles necessary for display Therefore, the effect of high stability of displayed chromaticity can be obtained.

3. The image display medium according to claim 2, wherein each particle of the first particle group includes a charge generation material that generates electrons and holes by light irradiation, and a charge transport material that transports electrons or holes. Can do.
When the particles are negatively charged, the electrons generated by the light irradiation move out of the particles by the charge transport material that transports only the electrons and flow out from the contacting electrodes. On the other hand, holes generated by light irradiation remain in the particles and are neutralized with negative surface charges, and the particles are uncharged. In addition, when a voltage is applied between the substrates so that the electrode in contact with the particle simultaneously with light irradiation has a positive voltage, the movement of electrons in the particle is promoted.
When the particles are positively charged, the holes generated by light irradiation move out of the particles by the charge transport material that transports only the holes and flow out of the contacting electrodes. On the other hand, the electrons generated by light irradiation remain in the particles, neutralize with the positive surface charge, and the particles become uncharged. In addition, when a voltage is applied between the substrates so that the electrode that contacts the particles simultaneously with light irradiation has a negative voltage, the movement of holes in the particles is promoted.

  The image display medium according to claim 3 is the image display medium according to claim 1 or 2, wherein the first particle group is a cyan particle that is changed from a charged state to an uncharged state by red light. A group of cyan colored particles, a group of magenta colored particles composed of magenta color particles that are changed from a charged state to a non-charged state by green light, and a yellow color composed of yellow particles that are changed from a charged state to a non-charged state by blue light. It can be composed of at least one kind of colored particle group.

  For this reason, light irradiation is performed by the light irradiation means, and an electric field is formed between the pair of substrates, so that particles of at least one of yellow, magenta, and cyan are selectively separated between the pair of substrates. Since the image can be displayed by moving, multicolor display is possible.

  The image display medium according to claim 4 is the image display medium according to any one of claims 1 to 3, wherein an insulating property of a color different from that of the first particle group is provided between the pair of substrates. Particles can be further encapsulated, and the insulating particles can be arranged in a direction substantially perpendicular to the opposing direction of the pair of substrates with a gap through which each of the particles of the first particle group can pass.

  Thus, since the insulating particles having a color different from that of the first particle group are arranged between the pair of substrates, the first particle group moves between the pair of substrates and is positioned on the back side of the insulating particles. Thus, the color of the insulating particles can be displayed as the color of the image display medium.

  The image display device according to claim 5, wherein in accordance with color data indicating a color to be displayed on the image display medium, a colored particle group of each color such that particles other than the color according to the color data are in an uncharged state. A voltage is applied between the light irradiating means for irradiating the image display medium according to any one of claims 1 to 4 with light having a specific wavelength corresponding to the pair of substrates to generate a potential difference. Voltage applying means.

  Depending on the color data indicating the color to be displayed on the image display medium by the light irradiation means, light of a specific wavelength corresponding to the colored particle group of each color that makes particles other than the color corresponding to the color data uncharged. In addition to irradiating an image display medium and generating a potential difference between a pair of substrates, an image with a simple configuration is not required, as in the case of applying a voltage to a position corresponding to a pixel position, and no matrix electrode or pixel electrode is required. It can be a display device. Further, since the resolution of the image is not limited by the electrode resolution, it is possible to provide an image display capable of realizing a higher resolution image display.

  The image display device according to claim 6 is the image display device according to claim 5, wherein particles other than the color corresponding to the color data in the first particle group are in an uncharged state. The light irradiation means is controlled to irradiate light of a specific wavelength, and the other substrate after the charged particles in the first particle group move to one of the pair of substrates. And a control means for controlling the voltage application means to apply a voltage such that the charged particles move to the one substrate after a voltage that moves to the substrate is applied a plurality of times.

  Depending on where each particle of the first particle group is located between the pair of substrates, particles that are not irradiated with light of a specific wavelength by the light irradiation means may be generated. In the image display device according to claim 6, while irradiating light of a specific wavelength that makes particles other than colors corresponding to color data uncharged, charged particles in the first particle group Since a voltage that moves to one of the pair of substrates and then moves to the other substrate is applied several times, and then a voltage that moves charged particles to the one substrate is applied. It is possible to irradiate light of a specific wavelength to almost all of the first particle group included in the display medium.

  For this reason, by irradiating light of a specific wavelength that makes particles other than the color corresponding to the color data uncharged, the first particle group included in the image display medium is made uncharged. Since almost all the target particles can be in an uncharged state, it is possible to suppress deterioration in image quality due to mixing of non-target colors to be displayed in the color region to be displayed.

  The image display device according to claim 7 is the image display device according to claim 5 or 6, wherein the light irradiation unit is a cyan colored particle group including cyan particles in the first particle group. Red light as the light to make the uncharged state, green light as the light to make the magenta colored particles group made of magenta particles uncharged, and the yellow colored particle group made of yellow particles made uncharged state The image display medium can be irradiated with blue light as the light to be emitted.

  The image display device according to claim 8 is the image display device according to any one of claims 5 to 7, wherein the light irradiation means is provided on the image display medium in the first particle group. It is possible to irradiate a region corresponding to each pixel of the image display medium with light of a specific wavelength that makes particles other than the color of the color data corresponding to each pixel of the image to be displayed uncharged. For this reason, a high-resolution image display apparatus can be provided.

  According to the image display method of the ninth aspect, it is possible to provide an image display method capable of repeatedly rewriting multiple colors with a simple configuration and high resolution. Specifically, the image display method according to claim 9 forms an electric field or a magnetic field between the pair of substrates of the image display medium according to any one of claims 1 to 4. In the image display medium according to any one of claims 1 to 4, in accordance with color data indicating a color displayed on the image display medium, particles other than the color corresponding to the color data are set in an uncharged state. The light of the specific wavelength corresponding to the colored particle group of each color is irradiated.

  Further, according to the image display method of the tenth aspect, it is possible to provide an image display method capable of repeatedly rewriting multiple colors with a simple configuration and high resolution. Specifically, an image display method according to a ninth aspect is based on color data indicating a color displayed on the image display medium according to any one of the first to fourth aspects. Then, the charged particles in the first particle group are irradiated with light of a specific wavelength corresponding to the colored particle group of each color so that the particles other than the color according to the color data are in an uncharged state. Between the pair of substrates so that the charged particles move to the one substrate after forming an electric field that moves to the other substrate multiple times after moving to one of the pair of substrates. An electric field is formed in

  As described above, according to the image display medium, the image display device, and the image display method of the present invention, the colors of the pair of substrates are different from each other and irradiated with light of a specific wavelength corresponding to the colored particle group of each color. With multiple types of particle groups that change from a charged state to an uncharged state, only the particles that are to be moved by light irradiation are charged, so it is possible to rewrite multiple colors repeatedly with a simple configuration and high resolution. It is possible to provide a possible image display medium, an image display device, and an image display method.

  Embodiments of the present invention will be described below with reference to the drawings.

  As shown in FIG. 1, the image display apparatus according to the embodiment of the present invention includes an image display medium 12 for displaying an image, a light irradiation unit 14, a voltage application unit 16, and a control unit 18. ing. The control part 18 is connected to the voltage application part 16 and the light irradiation part 14 so that signal transmission / reception is possible.

  The image display medium 12 corresponds to the image display medium of the present invention, the image display apparatus 10 corresponds to the image display apparatus of the present invention, and the voltage application unit 16 corresponds to the voltage application means of the image display apparatus of the present invention. The control unit 18 corresponds to the control means of the image display apparatus of the present invention.

  The image display medium 12 holds the display substrate 20 and the back substrate 22 at a constant interval between the display substrate 20 serving as an image display surface and the back substrate 22 facing the display substrate 20 with a minute gap. The first particle group 34 and the insulating particles 36 are formed in the gap member 24 for the above, and the area formed by the display substrate 20, the back substrate 22, and the gap member 24 (hereinafter, appropriately referred to as a divided area). It is configured to be enclosed.

  In addition, by providing the gap member 24 so that the divided area corresponds to each pixel when an image is displayed on the image display medium 12, it is possible to configure color display for each pixel.

  As the display substrate 20 and the back substrate 22 of the image display medium 12, a transparent glass substrate, a resin substrate such as acrylic, and various transparent films can be used.

Moreover, examples of the material constituting the display substrate 20 and the back substrate 22 include glass or plastic. However, the material is flexible in that it is close to paper hard copy and has excellent mechanical strength that can withstand rough handling. It is desirable to use materials. Examples of such a plastic substrate include polyester films such as polyethylene terephthalate, polycarbonate, polyimide, polystyrene, and polyethersulfone. The thickness of the substrate is preferably about 50 μm to 500 μm in terms of self-supporting property, flexibility, lightness, and thickness when stacked.
In this embodiment, polyethylene terephthalate having a thickness of 125 μm is used.

  Display electrodes 26 are stacked on the display substrate 20. A back electrode 30 is laminated on the back substrate 22. Note that a surface coat layer 28 may be further formed on the display electrode 26, and a surface coat layer 32 may be further formed on the back electrode 30.

  As the display electrode 26 and the back electrode 30, an indium tin oxide (ITO) electrode, indium zinc oxide (IZO), a copper electrode, a nickel electrode, or the like can be used. The display electrode requires transparency, but the back electrode is not limited thereto. In this embodiment, the ITO electrode is used as the display electrode 26 and the copper electrode is used as the back electrode 30, and a single continuous electrode covering the entire area of the display unit is prepared on the display surface and the back surface, respectively, and the gap member 24 is interposed therebetween. So as to be opposed to each other.

  The surface coat layer 32 may be omitted, but within a range that does not impair the conductivity of the electrode, inorganic thin films such as titanium oxide, silica oxide, and aluminum oxide having a thickness of several nm, polyester, polycarbonate, polyimide, polystyrene Further, a resin thin film such as epoxy, and a thin film made of a mixture thereof can be used. As the surface coat layer 28, an inorganic thin film such as silicon nitride that does not impair transparency, or a resin film such as polycarbonate, acrylic, or polyester having high transparency can be used.

  Such a configuration including electrodes on a substrate can be easily formed by using, for example, a 7059 glass substrate with transparent ITO of length × width × thickness = 25 mm × 25 mm × 1.1 mm. The details of the materials constituting the display substrate 20, the back substrate 22, the display electrode 26, and the back electrode 30 will be described later.

  The gap member 24 is formed, for example, by applying a thermosetting epoxy resin to the rear substrate 22 in a desired pattern shape by screen printing, heat-curing it, and repeating this process until the required height is reached. be able to. In the present embodiment, the height of the gap member 24 is set to 0.1 mm.

  The gap member 24 can be formed by, for example, photoetching of a dry film type photoresist in addition to the printing method described above. It can also be formed by adhering a thermoplastic film formed in a desired surface shape to the back substrate 22 by injection compression molding, embossing, hot pressing or the like. Further, the gap member 24 can be integrally formed with the back substrate 22 by embossing or hot pressing. Of course, if the transparency is not impaired, the gap member 24 may be formed on the display substrate 20 side, or may be integrally formed with the display substrate 20.

  The back electrode 30 and the display electrode 26 are each connected to the voltage application unit 16. Although not particularly illustrated, the voltage application unit 16 includes an electric field generation device, a sequencer, a controller (logic IC), and the like, and the electric field generation device includes a power source, a waveform generation device, an amplification device, and the like. The voltage application unit 16 generates a potential difference between the display substrate 20 side and the back substrate 22 side by applying a predetermined level of voltage to the back electrode 30 and the display electrode 26 at a predetermined timing under the control of the control unit 18.

  For example, the light irradiation unit 14 includes an optical writing device in which a surface emitting device such as a CRT is combined with a fiber optical system or an imaging optical system. Under the control of the control unit 18, the light irradiation unit 14 irradiates the divided areas corresponding to the respective pixels with light according to the color data indicating the color of each pixel of the image data displayed on the image display medium 12.

  As shown in FIG. 2, the light irradiation unit 14 includes a light emitting unit 44 that emits light from the rear substrate 22 side of the image display medium 12.

  The light emitting unit 44 includes a green light emitting unit 44G that emits green light, a red light emitting unit 44R that emits red light, and a blue light emitting unit 44B that emits blue light. Switching of light emission or non-light emission of the red light emitting unit 44R, the blue light emitting unit 44B, and the green light emitting unit 44G is performed under the control of the control unit 18.

  As the light emitting unit 44, for example, a fluorescent lamp, a halogen lamp, a fluorescent display tube, a plasma light emitting element, an EL (electroluminescence) light emitting element, an LED, or the like can be used.

  The control unit 18 switches the color of light emitted from the light emitting unit 44. That is, the control unit 18 irradiates the divided region corresponding to each pixel of the image data with light having a specific wavelength so as to make the first particles 34 other than the color corresponding to the color data of each pixel uncharged. In addition, the light irradiation unit 14 is controlled.

  The light emitting unit 44 of the light irradiation unit 14 is supported by a linear guide 46. The linear guide 46 is provided at a predetermined interval from the back substrate 22 of the image display medium 12 and is supported so as to be movable in the longitudinal direction of a long member 48 that is long in the direction along the plate surface of the back substrate 22. Yes. The linear guide 46 is connected to the control unit 18 so as to be able to send and receive signals, and includes a motor 50 for moving the linear guide 46 in the longitudinal direction of the long member 48.

  For this reason, the light irradiation unit 14 moves the linear guide 46 in the direction along the plate surface of the back substrate 22 by the control of the motor 50 and the light emission control of the light emitting unit 44 by the control unit 18. Through the back electrode 30 and the surface coat layer 32, the entire surface of each divided region can be irradiated with light of uniform light intensity.

  In addition, you may make it irradiate a division area through the lens which abbreviate | omits illustration so that the light irradiated from the light emission part 44 may be irradiated to a division area uniformly.

  In addition, the light irradiation part 14 and the control part 18 may be connected so that signal transmission / reception is possible using a radio | wireless, electromagnetic waves, infrared rays, an ultrasonic wave etc. other than connecting with wiring etc., for example.

  Moreover, the light irradiation part 14 should just be comprised so that the light of uniform light intensity can be irradiated with respect to the whole surface of each division area via the back substrate 22, the back electrode 30, and the surface coat layer 32, The configuration is not limited to the above.

  For example, as the light irradiation unit 14, a laser exposure apparatus that scans one-dimensionally or two-dimensionally with a scanning optical system as spot light modulated for each pixel with light from each laser light source that oscillates RGB wavelengths, It is possible to apply an exposure apparatus that uses a light source configured to divide the illumination light from a fluorescent lamp, halogen lamp, etc., and irradiate it directly or through a reflector or transmission, or to form an image with a lens. It is.

  The first particle group 34 includes a plurality of types of colored particle groups having different colors, and transitions from a charged state to an uncharged state charged by irradiation with light of a specific wavelength corresponding to the colored particle group of each color. It is a particle group. These first particle groups 34 are charged to the same polarity and substantially uniform potential in the charged state.

In the present embodiment, as a plurality of types of colored particle groups constituting the first particle group 34, a cyan colored particle group 34C composed of cyan particles that change from a charged state to an uncharged state when irradiated with red light. , Yellow colored particles by a magenta colored particle group 34M that changes from a charged state to an uncharged state when irradiated with green light, and yellow particles that changes from a charged state to an uncharged state when irradiated with blue light A first particle group 34 in which the group 34Y is mixed at a ratio of 1: 1 to 1 (particle number ratio) is enclosed in the image display medium 12.
This mixing ratio is the same ratio (preferably one to one) from the viewpoint of color uniformity and smoothness.

  In the present embodiment, specifically, the cyan colored particle group 34C, the magenta colored particle group 34M, and the yellow colored particle group 34Y that were adjusted by the following procedure were used.

The adjustment of the cyan colored particle group 34C will be described.
First, 100 parts by weight of a polyester resin, 2 parts by weight of benzimidazole perylene, 5 parts by weight of CI Pigment Blue 15: 3, 10 parts by weight of n-type hydrogenated amorphous silicon carbide powder, 2 of CO40PY CHARGE PSY VP2038 (manufactured by Clariant Japan) A part by weight and 110 parts by weight of ethyl acetate are dispersed in a ball mill for 48 hours to obtain Liquid A. Next, 100 parts by weight of a 2% aqueous solution of carboxymethyl cellulose was prepared to obtain a liquid B. Next, 100 parts by weight of Liquid B is stirred with an emulsifier, and 50 parts by weight of Liquid A is slowly added therein to suspend the mixed liquid. Thereafter, the mixture was depressurized to remove ethyl acetate, washed with water, dried and classified to obtain a cyan colored particle group 34C having a volume average primary particle size of about 3 μm.
The cyan colored particle group 34C and the insulating particles 36 were mixed and stirred, and then dispersed in an isoparaffinic hydrocarbon solvent to obtain a dispersion of the cyan colored particle group 34C and the insulating particles 36.

  The cyan colored particle group 34 </ b> C is sealed on the back electrode of the image display medium 12 of the image display device 10, and changes from a charged state to an uncharged state when irradiated with red light.

The cyan colored particle group 34C is in a state of being charged to a predetermined potential when sealed in the image display medium 12. The predetermined potential is a charge amount having substantially the same polarity and the same polarity as the charge amount of the other colored particle group 34 (magenta colored particle group 34M and yellow colored particle group 34Y) sealed in the image display medium 12. Show. In the above examples, all are negative.
This amount of charge can be adjusted by mixing and stirring the cyan colored particle group 34C and the insulating particles 36.

Next, adjustment of the magenta colored particle group 34M will be described.
First, 100 parts by weight of a polyester resin, 50 parts by weight of benzimidazole perylene, C.I. I. 4 parts by weight of Pigment Red 57, 10 parts by weight of n-type hydrogenated amorphous silicon carbide powder, 2 parts by weight of CO40PY CHARGE PSY VP2038 (manufactured by Clariant Japan), and 110 parts by weight of ethyl acetate are dispersed in a ball mill for 48 hours to form C liquid. On the other hand, 100 parts by weight of a 2% aqueous solution of carboxymethyl cellulose was prepared to obtain a D solution. Next, 100 parts by weight of D liquid was stirred with an emulsifier, and 50 parts by weight of C liquid was slowly added therein to suspend the mixed liquid. Thereafter, ethyl acetate was removed under reduced pressure, washed with water, dried and classified to obtain a magenta colored particle group 34M having a volume average primary particle size of about 3 μm.
The magenta colored particle group 34M and the insulating particles 36 were mixed and stirred, and then dispersed in an isoparaffin hydrocarbon solvent to obtain a dispersion of the magenta colored particle group 34M and the insulating particles 36.

By the above adjustment, a magenta colored particle group 34M having a volume average primary particle size of about 3 μm was obtained.
The magenta colored particle group 34M is changed from a charged state to an uncharged state when irradiated with green light.

The magenta colored particle group 34M is in a state of being charged to the predetermined potential when sealed in the image display medium 12.
This charge amount can be adjusted by mixing and stirring the magenta colored particle group 34M with the insulating particles 36.

Next, adjustment of the yellow colored particle group 34Y will be described.
First, 100 parts by weight of a polyester resin, 2 parts by weight of benz30 imidazole perylene, C.I. I. 5 parts by weight of Pigment Yellow 12, 10 parts by weight of n-type hydrogenated amorphous silicon carbide powder, 2 parts by weight of CO40PY CHARGE PSY VP2038 (manufactured by Clariant Japan) and 110 parts by weight of ethyl acetate are dispersed for 48 hours with a ball mill. It was. On the other hand, 100 parts by weight of a 2% aqueous solution of carboxymethylcellulose was prepared and used as Liquid F. Next, 100 parts by weight of solution F was stirred with an emulsifier, and 50 parts by weight of solution E was slowly added to suspend the mixed solution. Thereafter, ethyl acetate was removed under reduced pressure, washed with water, dried and classified to obtain yellow colored particle group 34Y having a volume average primary particle size of about 3 μm.
The yellow colored particle group 34Y and the insulating particles 36 were mixed and stirred, and then dispersed in an isoparaffinic hydrocarbon solvent to obtain a dispersion of the yellow colored particle group 34Y and the insulating particles 36.

By the above adjustment, a yellow colored particle group 34Y having a volume average primary particle size of about 3 μm was obtained.
The yellow colored particle group 34Y changes from a charged state to an uncharged state when irradiated with blue light.

The yellow colored particle group 34Y is in a state of being charged to the predetermined potential when enclosed in the image display medium 12.
This charge amount can be adjusted by mixing and stirring the yellow colored particle group 34Y with the insulating particles 36.

Next, the insulating particles 36 will be described. The insulating particles 36 are insulating particles having a color different from the color of the first particle group 34 enclosed in the same divided region, and each particle of the first particle group 34 can pass therethrough. They are arranged in a direction substantially perpendicular to the opposing direction of the back substrate 22 and the display substrate 20 with a gap.
That is, each particle of the first particle group 34 moves through the gap between the insulating particles 36 from the back substrate 22 side to the display substrate 20 side or from the display substrate 20 side to the back substrate 22 side. it can. In the present embodiment, the case where white particles are used as the insulating particles 36 will be described, but any color different from the color of the first particle group 34 enclosed in the same divided region may be used. It may be black or the like.

  For example, as shown in FIG. 1, the insulating particles 36 have a gap through which each of the particles constituting the first particle group 34 can pass, in a direction substantially orthogonal to the facing direction of the back substrate 22 and the display substrate 20. It is arranged. Further, the insulating particles 36 are displayed between the back substrate 22 and the insulating particles 36, and between the display substrate 20 and the insulating particles 36, each particle of the first particle group 34 is displayed with the back substrate 22. A plurality of layers are provided in the opposite direction of the substrate 20 so as to be stacked.

In order to provide the insulating particles 36 between the back substrate 22 and the display substrate 20 so as to satisfy the above-described conditions, a dispersion of the cyan colored particle group 34C and the insulating particles 36 created as described above, and magenta coloring. The dispersion of the particle group 34M and the insulating particles 36, and the yellow colored particle group 34Y and the dispersion of the insulating particles 36 are mixed to prepare a dispersion of the three-color particle group and the insulating particles 36, and the back substrate 22 is prepared. And the display substrate 20.
For example, if a mixed dispersion of a group of three color particles and insulating particles 36 is filled on the rear substrate 22 with the partition walls and the display substrate 20 is placed thereon, the apex portion of the partition walls and the display substrate are sealed. Good.

The adjustment of the insulating particles 36 will be described.
Cyclohexyl methacrylate: 53 parts by weight, titanium oxide: (Taipeku CR6
3: Ishihara Sangyo Co., Ltd.): 45 parts by weight and cyclohexane: 5 parts by weight using zirconia balls having a diameter of 10 mm, and carrying out ball milling for 20 hours to prepare dispersion A. A charcoal cal dispersion B is prepared by finely grinding 40 parts by weight of calcium carbonate and 60 parts by weight of water with a ball mill. 2% serogen aqueous solution: 4.3 g, charcoal cal dispersion liquid 8.5 g, and 20% saline solution: 50 g were mixed, degassed with an ultrasonic machine for 10 minutes, and stirred with an emulsifier to obtain a mixed solution C Create 35 g of dispersion A, 1 g of divinylbenzene, and polymerization initiator AIBN: 0.35 g are sufficiently mixed and degassed with an ultrasonic machine for 10 minutes. This is put in the mixed solution C and emulsified with an emulsifier.
Next, this emulsified liquid is put into a bottle, siliconized, and using an injection needle, vacuum deaeration is sufficiently performed, and nitrogen gas is sealed. Next, it reacts at 60 degreeC for 10 hours, and produces particle | grains. After cooling, the dispersion is freed from cyclohexane for 2 days at −35 ° C. and 0.1 Pa using a freeze dryer. The obtained fine particle powder is dispersed in ion-exchanged water, calcium carbonate is decomposed with hydrochloric acid water, and filtration is performed. Then, it is washed with sufficient distilled water to make the particle size uniform and dried.

By the above adjustment, insulating particles 36 having a volume average primary particle size of about 23 μm were obtained.
As such insulating particles 36, commercially available products manufactured by Sekisui Plastics Co., Ltd., trade names: MBX-20 White, MBX-20 Black manufactured by Daikin Industries, Ltd., trade names: Lubron L, manufactured by Toshiba Silicone Co., Ltd., trade name: Tospearl, etc. can be mentioned.

In the image display medium 12 of the present invention, the gap member 24 is formed as described above on the back substrate 22 on which the back electrode 30 and the surface coat layer 32 are laminated, and then each of the cyan colored particle groups 34C and magenta colored. The first particle group 34 obtained by mixing each of the mixed stirring particle groups of the particle group 34M and the insulating particles 36 of the yellow colored particle group 34Y in a ratio of 1: 1, and the insulating particles 36 are isoparaffinic hydrocarbons. A dispersion liquid dispersed in an insulating transparent solvent such as The amount of the insulating particles 36 was set to 1/10 with respect to the first particle group 34.
The gap between the insulating particles 36 and the back substrate 22 is 15 to 20 μm, and 4 to 6 layers of colored particles are stacked in the opposite direction of the substrate, and the gap has the same degree of space above it. It was.

  Next, the surface of the display substrate 20 on which the display electrode 26 and the surface coat layer 28 are laminated is arranged on the gap member 24 so as to face the back substrate 22 and is pressed and held with a double clip to hold the gap member 24. And the surface coat layer 28, and the gap member 24 and the surface coat layer 32 were adhered to each other to form the image display medium 12.

Here, as shown in the above example, each particle of the first particle group 34 includes a charge generation material that generates holes and electrons, a charge transport material that transports holes or electrons, and charge control. Consists of materials.
In addition, as a charge generation material that generates holes and electrons, a charge transport material that transports holes or electrons, a charge control material, a material that forms the insulating particles 36, and a material that forms the display substrate 20 and the back substrate 22. Is not limited to those described above. For example, the following can be selected and used.

  For example, charge generation materials that generate holes or electrons include azo pigments such as bisazo pigments and trisazo pigments, quinone pigments, perylene pigments, indigo pigments, thioindigo pigments, bisbenzimidazole pigments, phthalocyanines. Pigments, quinacridone pigments, quinoline pigments, lake pigments, azo lake pigments, anthraquinone pigments, oxazine pigments, dioxazine pigments, triphenylmethane pigments, azurenium dyes, squalium dyes, pyrylium dyes, Various organic pigments such as triallylmethane dyes, xanthene dyes, thiazine dyes, cyanine dyes, dyes, and amorphous silicon, amorphous selenium, tellurium, selenium-tellurium alloys, cadmium sulfide, antimony sulfide, zinc oxide, Titanium oxide, sulfide Examples thereof include inorganic materials such as copper, nickel sulfide, and zinc sulfide.

  In addition, as a charge transport material that transports holes or electrons, there are an electron transport material that transports electrons and a hole transport material that transports holes. Examples of electron transport materials include benzoquinone compounds, tetracyanoethylene compounds, tetracyanoquinodimethane compounds, fluorenone compounds, xanthone compounds, phenanthraquinone compounds, phthalic anhydride compounds, diphenoquinone compounds. Inorganic N-type semiconductors composed of organic compounds such as bilan compounds, amorphous silicon, amorphous selenium, tellurium, selenium-tellurium alloys, cadmium sulfide, copper sulfide, nickel sulfide, antimony sulfide, zinc sulfide, zinc oxide, titanium oxide, zinc sulfide Materials.

  In addition, as hole transport materials, low molecular weight compounds include pyrene compounds, carbazole compounds, hydrazone compounds, oxazole compounds, oxadiazole compounds, stilbene compounds, pyrazoline compounds, arylamine compounds, arylmethanes. Compounds, benzidine compounds, thiazole compounds, stilbene compounds, butadiene compounds, etc., and examples of the polymer compounds include poly-N-vinylcarbazole, halogenated poly-N-vinylcarbazole, polyvinylpyrene, polyvinylanthrae. Organic compounds such as sen, polyvinyl acridine, pyrene-formaldehyde resin, ethylcarbazole-formaldehyde resin, ethylcarbazole-formaldehyde resin, triphenylmethane polymer, polysilane, and amorphous silicon Inorganic P-type semiconductors composed of amorphous selenium, tellurium, selenium-tellurium alloy, cadmium sulfide, copper sulfide, nickel sulfide, antimony sulfide, zinc sulfide, and titanium oxide.

  As the charge control agent, known materials used for toner materials for electrophotography can be used. For example, cetylpyridyl chloride, BONTRON P-51, BONTRON P-53, BONTRON E-84, BONTRON E-81 (above, Quaternary ammonium salts such as Orient Chemical Industry Co., Ltd.), salicylic acid metal complexes, phenol condensates, tetraphenyl compounds, metal oxide fine particles, and metal oxide fine particles surface-treated with various coupling agents. it can.

  In addition, as the binder resin for binding the charge transport material and the charge generation material into one particle, a high-molecular polymer capable of forming an electrically insulating film is preferable, but as such a high-molecular polymer, , Polycarbonate, polyester, methacrylic resin, acrylic resin, polyvinyl chloride, polyvinylidene chloride, polystyrene, polyvinyl acetate, styrene-butadiene copolymer, vinylidene chloride-acrylonitrile polymer, vinyl chloride-vinyl acetate copolymer, vinyl chloride- Vinyl acetate-maleic anhydride copolymer, silicone resin, silicone-alkyd resin, phenol-formaldehyde resin, styrene-alkyd resin, poly-N-vinylcarbazole, polyvinyl butyral, polyvinyl formal, polysulfone, casein, gelatin, poly Examples include vinyl alcohol, ethyl cellulose, phenol resin, polyamide, carboxy-methyl cellulose, vinylidene chloride polymer latex, and polyurethane. In addition, binder resin is not limited to these, These binder resin can be used individually or in mixture of 2 or more types. Furthermore, additives such as dispersion stabilizers, plasticizers, surface modifiers, antioxidants, and photodegradation inhibitors can be used together with these binder resins.

  Note that the charge transport material, charge generation material, charge control material, binder resin, etc. used in the present invention are not limited to those listed here, and when used alone or in combination of two or more. It can also be used.

  In addition, the methods that can be used as the method for producing the charge generation material and the charge transport material-containing particles in the present embodiment and each embodiment described later are as follows.

  As one of the methods for producing the first particle group 34, a dissolution suspension method is known. In the dissolution suspension method, an oil phase solution in which a resin such as polyester or styrene and a pigment are dissolved and dispersed in a solvent is mixed and suspended in an aqueous phase containing a water-soluble resin to form particles, and the solvent is removed to dry powder. It is a way to embody. A charge transport material such as an n-type hydrogenated amorphous silicon carbide powder, a polyester resin, and a colored pigment dissolved and dispersed in a solvent is mixed and suspended in an aqueous solvent to form particles, and the solvent is removed into powder. As a result, particles containing a charge transport material can be obtained. As the charge generation material and the charge transport material, those described above can be used.

  As the colorant, known organic or inorganic pigments and dyes, and oil-soluble dyes can be used. For example, carbon black such as furnace black and channel black, inorganic pigments such as bengara, bitumen and titanium oxide, azo pigments such as fast yellow, disazo yellow, pyrazolone red, chelate red, brilliant carmine and para brown, copper phthalocyanine, no metal Examples thereof include phthalocyanine pigments such as phthalocyanine, and condensed polycyclic pigments such as flavandron yellow, cyflomoandron orange, perylene red, quinacridone red, and dioxazine violet.

  As the solvent used for adjusting the oil phase component, a general organic solvent can be used. For example, hydrocarbons such as toluene, xylene and hexane, halogenated hydrocarbons such as methylene chloride, chloroform and dichloroethane, alcohols such as methanol and ethanol, ethers such as tetrahydrofuran, esters such as methyl acetate, ethyl acetate and butyl acetate , Ketones such as acetone, methyl ethyl ketone, and cyclohexanone.

  As the aqueous medium, water is mainly used, but a water-soluble solvent can also be mixed and used. Furthermore, it is preferable in terms of particle size distribution to add a dispersant.

  The first particle group 34 and the insulating particles 36 have been described as being dispersed in isoparaffinic hydrocarbons, but are not limited to the above as long as they are insulating solvents such as silicone oil. Further, it may be a gas such as air, or a hot melt material that melts into a liquid when heated.

  When each pixel is provided with a divided region of the image display medium 12 by the gap member 24 (a spatial region constituted by the display substrate 20, the back substrate 22, and the gap member 24), the above-mentioned is performed for each divided region. The light irradiation unit 14 is provided, and the control unit 18 performs control based on color data indicating a color for each pixel included in the image data for each light irradiation unit 14 in each divided region (see FIG. 3). do it.

  Next, the operation of the image display device 10 using the image display medium 12 of the present invention will be described.

When the control unit 18 of the image display device 10 receives image data of an image to be displayed on the image display device 10 from an external device (not shown) via a communication unit (not shown), the processing routine shown in FIG. Once executed, go to step 100.
In the present embodiment, for the sake of simplicity, description will be made assuming that color data indicating the color of a specific pixel is input. However, in practice, the following processing may be executed for each divided region corresponding to each pixel based on color data indicating the color of each pixel of the input image data.

  Before the processing routine shown in FIG. 3 is executed, as an initialization process, the voltage is applied so that all of the first particle groups 34 enclosed in the image display medium 12 are moved to the back substrate 22 side. A description will be given assuming that a voltage is applied by the application unit 16. As initialization processing, the electric field between the display substrate and the back substrate is switched a plurality of times, and the insulating particles 36 and the back electrode substrate 30 or the back surface coat are passed through the first particle group 34 between the insulating particles 36. The charged state is adjusted by contacting the layer 32. In the state where all of the first particle groups 34 are moved to the back substrate 22 side (see FIG. 4A), the image display medium 12 is insulative particles 36 when viewed from the display substrate 20 side. Therefore, when the color of the insulating particles 36 is white, white display is performed.

  In step 100, the acquired color data is read.

  In the next step 102, based on the color data read in step 100, the light irradiation unit 14 is controlled so as to irradiate the divided area corresponding to the pixel of the color data.

  Specifically, in the process of step 102, for example, when yellow display is performed in a certain divided area, only the yellow colored particle group 34Y in the divided area is charged, and the other coloring included in the divided area is set. In order to make the particle group 34 (the cyan colored particle group 34C and the magenta colored particle group 34M) uncharged, the red light for making the cyan colored particle group 34C uncharged and the magenta colored particle group 34M The light irradiation unit 14 is controlled so as to start the process of irradiating the corresponding divided region with green light for setting the uncharged state.

  By this processing, as shown in FIG. 4A, blue light and green light are irradiated to the corresponding divided regions of the image display medium 12 from the red light emitting unit 44R and the green light emitting unit 44G of the light irradiation unit 14, respectively. Is done.

In the process of step 102, when light is irradiated in the divided area corresponding to the pixel of the color data, the linear guide 46 is moved in the divided area by controlling the motor 50, thereby moving the linear guide 46 in the divided area. It becomes possible to irradiate the light by the light emission part 44 uniformly. Here, the light irradiation unit 14 is controlled to end the light irradiation.
In the process of step 102, the back electrode 30 is grounded under the control of the control unit 18, or a voltage is applied so that the charged particles of the first particle group 34 continue to contact the back electrode 30. The voltage application unit 16 may be controlled so as to be applied to the display electrode 26 and the back electrode 30.

  In the next step 104, the voltage application unit 16 is controlled so that a voltage is applied to the display electrode 26 and the back electrode 30 so that the charged particles in the first particle group 34 move to the display substrate 20 side. To do.

  Under the control of the control unit 18 in Step 104, the voltage application unit 16 causes the display substrate 20 and the back surface so that the charged particles in the first particle group 34 move from the back substrate 22 side to the display substrate 20 side. A voltage for generating a potential difference with the substrate 22 is applied to the display electrode 26 and the back electrode 30.

  As shown in FIG. 4 (B), particles other than the particles in the first particle group 34 other than the non-charged particles due to the start of light irradiation by the light irradiation unit 14 in the above step 102 by the processing in step 104. However, it moves from the back substrate 22 side to the display substrate 20 side through the gap between the insulating particles 36.

  Here, when the light irradiation unit 14 irradiates light, the light irradiation unit 14 sufficiently irradiates the particles located in the first particle group 34 near the back substrate 22. However, there is a problem that the particles located at positions where light irradiation by the light irradiation unit 14 is difficult are not sufficiently irradiated with light.

Therefore, as shown in FIG. 4B, among the first particle group 34, the cyan colored particle group 34C that is uncharged by red light, and the magenta colored particle that is uncharged by green light. The particles in the group 34M and all the particles in the magenta colored particle group 34M and the particles in the charged state in the cyan colored particle group 34C are not charged. It moves to the display substrate 20 side together with the yellow colored particle group 34Y.
For this reason, not only the yellow colored particle group 34Y but also some of the cyan colored particle group 34C and some of the magenta colored particle group 34M also move to the display substrate 20 side. Will occur.

  Therefore, in the next step 106, the voltage application unit 16 is configured to apply a voltage to the display electrode 26 and the back electrode 30 such that the charged particles in the first particle group 34 move to the back substrate 22 side. To control.

  Under the control of the control unit 18 in step 106, the voltage application unit 16 causes the charged particles in the first particle group 34 to move between the display substrate 20 and the back substrate 22 so as to move to the back substrate 22 side. A voltage for generating a potential difference is applied to the display electrode 26 and the back electrode 30.

  By the process of step 106, the charged particles in the first particle group 34 move to the back substrate 22 side. Therefore, as shown in FIG. 4C, both charged particles and uncharged particles in the first particle group 34 are positioned on the back substrate 22 side.

  In the next step 108, it is determined whether or not the series of processing in steps 102, 104 and 106 has been repeatedly executed a predetermined number of times.

  In step 108, the predetermined number of times to perform the processes in steps 102, 104, and 106 is stored in advance in a memory (not shown) of the control unit 18, and a series of processes in steps 102, 104, and step 106 are performed. Each time it is executed, a counter provided in the control unit 18 is counted up, and a determination is made by determining whether or not the value after the count-up is the same as the predetermined number of times stored in the memory. be able to.

  The “predetermined number of times” stored in advance in a memory not shown in the control unit 18 means that the first particle group is in a state where all of the first particle groups 34 are positioned on the back substrate 22 side in advance. 34, the number of repetitions of a series of processes of steps 102 and 104 and step 106 required until only the first particle group 34 of a specific color of 34 moves to the display substrate 20 side is measured. This measurement result may be stored as a predetermined number of times in a memory not shown in the figure of the control unit 18 in advance.

  In the first particle group 34 in which the light irradiation by the light irradiation unit 14 was not performed only by performing the processes of Steps 102 and 104 and Step 106 once by the processes of Steps 102 to 108. Also for the particles, the light irradiation unit 14 irradiates substantially all the particles of the first particle group 34 in the divided region by repeatedly executing the processing of the step 102, the step 104, and the step 106. .

  For this reason, light can be irradiated to almost all the particles of the first particle group 34 of a color that should be in an uncharged state depending on the color of light irradiated by the light irradiation unit 14 to be in an uncharged state. In the present embodiment, all of the magenta colored particle group 34M and the cyan colored particle group 34C in the colored particle group 34 can be irradiated with red and green light, and can be in an uncharged state.

  In the next step 110, after the value of a counter (not shown) in the control unit 18 is cleared (set to “0”), the charged state in the first particle group 34 is again set in the same manner as in step 104. The voltage application unit 16 is controlled so that a voltage that causes the particles to move toward the display substrate 20 is applied to the display electrode 26 and the back electrode 30.

  As shown in FIG. 4 (D), particles other than the particles in the first particle group 34 other than the particles that have become uncharged by the start of light irradiation by the light irradiation unit 14 in step 102 as shown in FIG. As a result, only the yellow colored particle group 34Y moves from the back substrate 22 side to the display substrate 20 side through the gap between the insulating particles 36.

  In the next step 112, the voltage application unit 16 is controlled so that the voltage application performed up to step 110 is finished, and then this routine is finished.

  As described above, according to the image display medium 12 of the present invention, there are a plurality of types of colored particle groups 34 (yellow colored particle group 34Y, magenta colored particle group 34M, and cyan colored particle group 34C) having different colors. Then, a first particle group 34 that is changed from a charged state to an uncharged state by being irradiated with light of a specific wavelength corresponding to the colored particle group of each color is sealed between the display substrate 20 and the back substrate 22, and each color In the case where a voltage is applied to a position corresponding to a pixel position because image display is performed by selectively irradiating light of a wavelength that makes the colored particle group 34 in an uncharged state and generating a potential difference between the substrates. As described above, the image display medium 12 can be configured simply without the need for matrix electrodes or pixel electrodes, and the resolution of the image is not limited by the electrode resolution. It can be current.

  In addition, since the first particle group 34 that is changed from a charged state to an uncharged state by irradiation with light of a specific wavelength corresponding to the colored particle group of each color is enclosed between the display substrate 20 and the back substrate 22, Since only the colored particles unnecessary for display can be removed and the colored particles necessary for display can be reliably left, an effect of high stability of displayed chromaticity can be obtained.

  In addition, after the light irradiation unit 14 starts irradiating light for making the colored particle group 34 of a specific color uncharged, the charged particles in the first particle group 34 are transferred to the rear substrate 22. After a series of processes of moving from the side to the display substrate 20 side and then moving to the back substrate 22 side are repeated, the charged particles in the first particle group 34 are moved again to the display substrate 20 side. Therefore, light irradiation by the light irradiation unit 14 can be performed on substantially all the particles of the first particle group 34 included in the image display medium 12.

  For this reason, light of a specific wavelength is emitted from almost all the particles of the colored particle group 34 that should be in an uncharged state depending on the color of the light irradiated by the light irradiation unit 14 in the first particle group 34. Since irradiation can be performed, almost all of the particles to be uncharged can be uncharged, and a desired color can be displayed while image quality deterioration is suppressed.

  In this embodiment, the case where only the yellow colored particle group 34Y is selectively moved to the display substrate 20 side has been described. However, the yellow colored particle group 34Y, the magenta colored particle group 34M, and the cyan colored particle group 34C Among them, the colored particle group 34 of at least one color or a plurality of colors may be selectively moved to the display substrate 20 side.

  In this case, only the colored particle group 34 corresponding to the color to be moved to the display substrate 20 side is charged, and the colored particle group 34 other than the color to be moved is moved so as to be in an uncharged state. What is necessary is just to irradiate in the process of the said step 102 the light of the color for making the colored particle group 34 of colors other than the object into an uncharged state.

  In the present embodiment, the case where the first particle group 34 is moved by forming an electric field between the display substrate 20 and the back substrate 22 has been described. However, a magnetic field may be formed.

It is a schematic block diagram of the image display apparatus which concerns on this Embodiment. It is a schematic block diagram of the image display apparatus which concerns on this Embodiment. It is a flowchart which shows the process performed by the control part of the image display apparatus of this Embodiment. (A)-(D) are explanatory drawings which showed the state transition of the 1st particle group when the flowchart of FIG. 3 is performed in the image display apparatus of this Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Image display apparatus 12 Image display medium 14 Light irradiation part 16 Voltage application part 18 Control part 20 Display board 22 Back board 24 Gap member 26 Display electrode 30 Back electrode 34Y Yellow colored particle group 34C Cyan colored particle group 34M Magenta colored particle group 34 Colored particle group 36 Insulating particle 44 Light emitting part 44B Blue light emitting part 44R Red light emitting part 44G Green light emitting part 4G Green light emitting part

Claims (10)

A pair of substrates having at least translucency and arranged to face each other with a gap;
First, the charged state is changed from a charged state to an uncharged state by being irradiated with light of a specific wavelength corresponding to the colored particle group of each color. 1 particle group,
An image display medium comprising:   The image display medium according to claim 1, wherein each particle of the first particle group includes a charge generation material that generates electrons and holes by light irradiation and a charge transport material that transports electrons or holes.   The first particle group includes a cyan colored particle group composed of cyan particles that are changed from a charged state to an uncharged state by red light, and a magenta particle composed of magenta particles that are changed from a charged state to an uncharged state by green light. 3. The image display medium according to claim 1, wherein the image display medium is composed of at least one kind of colored particle group including a colored particle group, and a yellow colored particle group including yellow particles that are changed from a charged state to an uncharged state by blue light.   Insulating particles of a color different from that of the first particle group are further encapsulated between the pair of substrates, and the insulating particles have a gap through which the particles of the first particle group can pass. The image display medium according to any one of claims 1 to 3, wherein the image display medium is arranged in a direction substantially orthogonal to the opposing direction. In accordance with color data indicating a color to be displayed on the image display medium, the light having a specific wavelength corresponding to the colored particle group of each color such that particles other than the color according to the color data are in an uncharged state, Light irradiation means for irradiating the image display medium according to any one of claims 1 to 4,
Voltage applying means for generating a potential difference by applying a voltage between the pair of substrates;
An image display device comprising:   The light irradiation means is controlled so as to irradiate light of a specific wavelength such that particles other than the color according to the color data in the first particle group are in an uncharged state, and the first After applying a voltage such that the charged particles in the particle group move to one of the pair of substrates and then move to the other substrate, the charged particles are applied to the one substrate. The image display apparatus according to claim 5, further comprising a control unit configured to control the voltage application unit so as to apply a voltage such that the voltage moves.   The light irradiating means removes magenta colored particles composed of magenta particles as light that makes cyan colored particles composed of cyan particles out of the first particle group uncharged. 7. The image display medium according to claim 5, wherein the image display medium is irradiated with green light as light to be charged and blue light as light to make a yellow colored particle group composed of yellow particles uncharged. Image display device.   The light irradiating means emits light of a specific wavelength such that particles other than the color of the color data corresponding to each pixel of the image displayed on the image display medium in the first particle group are in an uncharged state. The image display device according to claim 5, wherein the image display medium irradiates a region corresponding to each pixel of the image display medium. An electric field or a magnetic field is formed between the pair of substrates of the image display medium according to any one of claims 1 to 4,
5. The image display medium according to claim 1, wherein particles other than the color corresponding to the color data are in an uncharged state in accordance with color data indicating a color displayed on the image display medium. And irradiating light of a specific wavelength corresponding to the colored particle group of each color,
Image display method. 5. The image display medium according to claim 1, wherein particles other than the color corresponding to the color data are in an uncharged state in accordance with color data indicating a color displayed on the image display medium. Irradiate light of a specific wavelength corresponding to the colored particle group of each color,
After forming an electric field a plurality of times so that the charged particles in the first particle group move to one of the pair of substrates and then move to the other substrate, the one substrate is charged. Forming an electric field between the pair of substrates so that the particles in a state move;
Image display method.

Images