JP2005215637A - Image display medium and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image display medium which is easy to manufacture and can display high quality images which are free of image unevenness by preventing uneven distribution of particles, and to provide its manufacturing method. <P>SOLUTION: This image display medium 1 is equipped with a display substrate 2, where row electrodes 21 formed on a display substrate member 20 are protected by a dielectric film 22, a non-display substrate 3 which is arranged facing the display substrate 2 and where column electrodes 31 formed on the non-display substrate member 30 are protected by a dielectric film 32; a sectioning member 5, which forms a plurality of cells 4 by sectioning the space between the display substrate 2 and non-display substrate 3 in parallel with the substrates 2 and 3; and a particle group, consisting of white particles 6A which are housed in respective cells 4 and are charged negatively and black particles 6B which are charged positively. A gap 5a, formed between the display substrate 2 and sectioning member 5, is filled with some of the group of particles to prevent particles from moving among cells 4. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an image display medium that can be rewritten repeatedly and a method for manufacturing the same, and in particular, an image display medium that is easy to manufacture, can prevent uneven distribution of particles, and can display a high-quality image with little image unevenness. It relates to the manufacturing method.

  As a conventional rewritable image display medium, one using toner is known (for example, see Patent Document 1).

  FIG. 8 is a schematic diagram of the image display medium. This image display medium includes a translucent display substrate 2 in which row electrodes 21 formed on a display substrate member 20 are protected by a dielectric film 22 and column electrodes 31 formed on a non-display substrate member 30. The non-display substrate 3 protected by the dielectric film 32, the display substrate 2 and the non-display substrate 3 are held facing each other, and the space between the substrates 2 and 3 is partitioned in a direction parallel to the substrates 2 and 3. A partition member 5 that forms a plurality of cells 4, a negatively charged white particle 6A housed in each cell 4, and a positively charged black particle 6B made of toner, and an adhesive that seals the periphery of the partition member 5 And a sealing member 7 made of an agent. The partition member 5 has a desired height obtained by performing screen printing with ink and heating and baking treatment a plurality of times.

  In the image display medium configured as described above, when a DC voltage is applied between the row electrode 21 and the column electrode 31, an electric field is formed between the electrodes 21 and 31, and the white particles 6 </ b> A and black are changed according to the direction of the electric field. The particles 6B move to the display substrate 2 or the non-display substrate 3 side, and image display is performed through the display substrate 3 by the contrast between the white particles 6A and the black particles 6B attached to the inside of the display substrate 3. According to this configuration, unlike an image display medium using electrophoresis or magnetophoresis, no liquid is required, so that an image with high contrast can be obtained.

JP 2003-107533 A ([0015] to [0044], FIGS. 1 to 6)

  However, according to the conventional image display medium, since only the periphery of the partition member 5 is sealed with the adhesive, the partition member 5 and the substrate 2, if the height and end face accuracy of the partition member 5 vary depending on the location. When the particles 6A and 6B are driven, as shown by the arrows in FIG. 8, the particles 6A and 6B scrub through the gap 5a and the amount of particles between the cells 4 There is a risk of unevenness in image quality. Further, after the partition member 5 is formed by screen printing, it is conceivable that the end face is polished to make the height dimension uniform, but the number of steps increases and it is not productive.

  Accordingly, it is an object of the present invention to provide an image display medium that can be easily manufactured, can prevent uneven distribution of particles, and can display a high-quality image with little image unevenness, and a method for manufacturing the same.

  In order to achieve the above object, according to the present invention, a first substrate having a first electrode, a second substrate having a second electrode, and the first substrate and the second substrate are opposed to each other. A partition member that partitions a space between the first and second substrates in a direction parallel to the substrate to form a plurality of cells, and is enclosed in the plurality of cells, respectively. For display with different colors and charging characteristics for displaying a predetermined image through the first or second substrate by moving between the first and second substrates by an electric field based on an applied voltage between the second electrodes There is provided an image display medium comprising a plurality of particle groups, and a plurality of particle groups for filling, which are filled in a gap generated at a partition position by the partition member and have different colors and charging characteristics.

  In order to achieve the above object, according to the present invention, a first substrate having a first electrode and a second substrate having a second electrode are opposed to each other and held by a partition member, and the first and second substrates A space between the substrates is partitioned in the direction parallel to the substrate by the partition member to form a plurality of cells, and the first and second are generated by an electric field based on an applied voltage between the first and second electrodes. In the method of manufacturing an image display medium in which a plurality of particle groups having different colors and charging characteristics for moving between the substrates and displaying a predetermined image through the first or second substrate are respectively enclosed in the plurality of cells. The holding of the first and second substrates by the partition member includes a step of filling a part of the particle group in the gap generated at the partition position.

  According to the image display medium and the method of manufacturing the same of the present invention, the plurality of particle groups filled in the gap generated at the partition position by the partition member have different charging characteristics and thus aggregate together to close the gap. Accordingly, there is no movement of particles between cells, and uneven distribution of particles can be prevented, and a high-quality image with little image unevenness can be displayed. Further, since the gap can be filled using the same particle group as the display particle group, the image display medium can be easily manufactured.

[First Embodiment] (Overall Configuration)
FIG. 1 shows an image display medium according to a first embodiment of the present invention. As shown in FIGS. 1A and 1B, the image display medium 1 includes a display substrate 2 as a first substrate, a non-display substrate 3 as a second substrate, and a display substrate 2 and a non-display. A partition made of an insulating material such as a thermosetting resin that holds the substrate 3 facing the substrate 3 and partitions the space between the substrates 2 and 3 in a direction parallel to the substrates 2 and 3 to form a plurality of cells 4. Member 5, two display particles composed of white particles 6 </ b> A and black particles 6 </ b> B having different colors and charging characteristics enclosed in cell 4, and sealing member 7 that seals the outer periphery of partition member 5. As shown in FIG. 1C, the gap 5a generated at the partition position by the partition member 5 includes two white particles 6A and black particles 6B for filling having different colors and charging characteristics. The particle group is filled with an adhesive.

(Configuration of each part)
The display substrate 2 includes a display substrate member 20 made of a transparent glass substrate or the like, a plurality of transparent strip-like row electrodes 21 made of ITO or the like formed on the display substrate member 20, and the particles 6A. , 6B is laminated with a dielectric film 22 made of polycarbonate or the like which stabilizes the charging characteristics.

  As the display substrate member 20, in addition to the transparent glass substrate, a transparent plastic substrate having transparency, polycarbonate resin, acrylic resin, polyimide resin, polyester resin, or the like can be used.

  In addition to the ITO, the transparent row electrode 21 has a light-transmitting oxide such as indyllium, tin, cadmium, and antimony, a composite oxide thereof, gold, silver, copper, carbon, nickel, and the like. A layer film, mixed film, or composite film having a thickness of 100 to 2000 angstroms formed by vapor deposition or sputtering, or an organic conductive material such as polypyrrole or polythiophene can be used.

  The dielectric film 22 has polycarbonate, polyester, polyimide, epoxy, polyisocyanate, polyamide, polyvinyl alcohol, polybutadiene, PMMA, copolymer nylon, ultraviolet curable acrylic depending on the charging characteristics of the particles 6A and 6B sealed in the cell 4. Resin, amorphous Teflon (R), or the like can be used. A material in which a charge transport material is contained in the insulating material constituting the dielectric film 22 can also be used. By containing a charge transport material, the chargeability of the particles 6A and 6B is improved by charging the particles 6A and 6B, and when the charge amount of the particles 6A and 6B becomes extremely large, the charges of the particles 6A and 6B are leaked. Effects such as stabilizing the charge amount of the particles 6A and 6B can be obtained.

  The non-display substrate 3 includes a non-display substrate member 30 made of an epoxy resin or the like, a plurality of strip-like column electrodes 31 made of copper or the like formed on the non-display substrate member 30, and the column electrodes 31 while protecting the column electrodes 31. , 6B is laminated with a dielectric film 32 made of polycarbonate or the like which stabilizes the charging characteristics. As the non-display substrate member 30, a substrate similar to the display substrate member 20 of the display substrate 2 may be used. As the dielectric film 32, a material corresponding to the charging characteristics of the particles 6 </ b> A and 6 </ b> B encapsulated in the cell 4 can be used similarly to the dielectric film 22 of the display substrate 3.

  For the partition member 5, in addition to the thermosetting resin, an insulating material such as a thermoplastic resin, an electron beam curable resin, a photocurable resin, or rubber can be used. In the present embodiment, one cell 4 corresponds to one pixel. However, the present invention is not limited to this, and a plurality of cells 4 may constitute one pixel.

  The white particles 6A and the black particles 6B are charged to different polarities by, for example, frictional charging by mutual friction. Here, the white particles 6A are negatively charged, and the black particles 6B are positively charged. For example, when the substrate inner dielectric film is polycarbonate resin (PC-Z), the average charge amount of the white particles 13 is -16 fC, and the average charge amount of the black particles 14 is +16 fC.

(Method for manufacturing image display medium)
Next, an example of a method for manufacturing the image display medium 1 according to the first embodiment will be described.

(1) Production of each part The display substrate 2 forms a plurality of row electrodes 21 by sputtering an ITO film on a display substrate member 20 made of transparent glass having a thickness of 2 mm, for example, and etching the ITO film into a predetermined pattern. A dielectric film 22 made of a polycarbonate film having a thickness of 5 μm is formed by dip-coating a solution in which 5 parts by weight of polycarbonate resin is dissolved in 45 parts by weight of monochlorobenzene on these row electrodes 21 and drying. To produce.

  In the non-display substrate 3, for example, a copper film is bonded onto a non-display substrate member 30 made of an epoxy substrate having a thickness of 5 mm, and this is etched into a predetermined pattern to form a plurality of column electrodes 31. The electrode 31 is prepared by dip-coating a solution in which 5 parts by weight of a polycarbonate resin is dissolved in 45 parts by weight of monochlorobenzene and drying to form a dielectric film 32 made of a polycarbonate film having a thickness of 5 μm. .

  For example, the partition member 5 may perform a process of pattern-printing ink made of a thermosetting resin on the dielectric film 32 of the non-display substrate 3 and heating and baking it at 110 ° C. in an oven. It is fabricated on the non-display substrate 3 by repeating a plurality of times until the height becomes.

  The white particles 6A are, for example, spherical particles of titanium oxide-containing crosslinked polymethyl methacrylate having a volume average particle size of 20 μm (classified by Sekisui Plastics Co., Ltd. Techpolymer MBX-20-White) in 100 parts by weight of isopropyltrimethoxysilane. It is obtained by adding 0.4 parts by weight of fine titania powder treated. The fine powder of titania treated with silane has the effect of suppressing the chargeability of the particles to an appropriate level and maintaining the fluidity of the particles at a high level. The amount of titania-treated titania fine powder added is appropriately adjusted depending on the diameter of the white particles 6A and the diameter of the fine powder. If the amount added is too large, fine powders released from the surface of the white particles 6A are generated. If these powders adhere to the surface of the black particles 6B, the charged polarity of the black particles 6B becomes the same as the charged polarity of the white particles 6A. 6B moves in the same direction as the white particles 6A, which is not preferable. The amount of titania with respect to 100 parts by weight of the particles is preferably 0.05 to 1.0 part by weight, more preferably 0.1 to 0.5 part by weight.

  As the black particles 6B, for example, spherical fine particles of carbon-containing crosslinked polymethylmethacrylate having a volume average particle diameter of 20 μm (classified by Sekisui Plastics Co., Ltd. Techpolymer MBX-20-Black) are used.

(2) Assembly of Each Part The assembly of the display substrate 2, the non-display substrate 3, the partition member 5, and the particles 6A and 6B manufactured as described above will be described with reference to FIG.

  As shown in FIG. 2A, the charged white particles 6A and the black particles 6B charged to the opposite polarity to the white particles 6A are mixed at a predetermined weight ratio, for example, a ratio of 2 to 1, and these are mixed. The partition member 5 disposed on the non-display substrate 3 is shaken off through the screen. The white particles 6A and the black particles 6B attached to the upper surface of the partition member 5 are removed with a silicon rubber blade.

  As shown in FIG. 2B, an adhesive is applied to the upper surface of the partition member 5 or the surface of the display substrate 3 in contact with the upper surface of the partition member 5, and the dielectric film 22 side of the display substrate 2 and the non-display substrate 3. The dielectric film 32 side, which is the side on which the partition member 5 is formed, is overlapped and fixed by a clamp or a clip. Examples of the adhesive include thermosetting resins such as epoxy resins and xylene resins, UV curable resins such as epoxy acrylates and urethane acrylates, thermoplastic resins such as polypropylene and polyethylene, acrylonitrile component polymers, vinyl alcohol component polymers. For example, a gas-permeable resin or the like can be used.

  As shown in FIG. 2C, a high frequency pulse voltage of, for example, 100 to 10 kHz is applied between the row electrode 21 and the column electrode 31 from the voltage application unit 8 for a predetermined time. As a result, the particles 6A and 6B enter and agglomerate into the gap 5a between the display substrate 2 caused by the dimensional error of the partition member 5, and close the gap 5a.

  Next, the outer periphery of the partition member 5 is sealed with the sealing member 7. As the sealing member 7, a thermosetting resin, a UV curable resin, a thermoplastic resin, a gas-resistant resin, or the like similar to the adhesive that bonds the partition member 5 and the display substrate 2 can be used.

(Image writing to image display media)
FIG. 3 shows the operation of the image display medium 1 according to the first embodiment. When a DC voltage (for example, DC 200V) is applied from the voltage application unit 8 so that a positive potential is applied to the row electrode 21 of the display substrate 2, the white particles 6A are negatively charged as shown in FIG. Therefore, it moves to the display substrate 2 side, and since the black particles 6B are positively charged, it moves to the non-display substrate 3 side.

  When the voltage application to the row electrode 21 is cut from the state of FIG. 3A, the electric field is maintained by the dielectric films 22 and 32 even when the voltage application is cut as shown in FIG. 3B. Therefore, the white particles 6A are held on the display substrate 2 side, and the black particles 6B are held on the non-display substrate 3 side.

  Next, when a DC voltage (for example, DC-200 V) is applied from the voltage application unit 8 so that a negative potential is applied to the row electrode 21, the white particles 6A are negatively charged as shown in FIG. Therefore, it moves to the non-display substrate 3 side, and since the black particles 6B are positively charged, it moves to the display substrate 2 side.

  When the voltage application to the row electrode 21 is cut off from the state of FIG. 3C, the electric field is maintained by the dielectric films 22 and 23 even when the voltage application is cut off, as shown in FIG. Therefore, the white particles 6A are held on the non-display substrate 3 side, and the black particles 6B are held on the display substrate 2 side.

  Since the shape of the particles 6A and 6B used in the present embodiment is a true sphere, the contact between the particles 6A and 6B is a point contact, and the contact between the particles 6A and 6B and the inner surfaces of the substrates 2 and 3 is also a point contact. is there. For this reason, the adhesion force based on the van der Waals force between the particles 6A and 6B and between the particles 6A and 6B and the inner surfaces of the substrates 2 and 3 is small. Therefore, as shown in FIGS. 3A and 3C, when a DC voltage is applied between the electrodes 21 and 31 by the voltage applying unit 8, the display substrate 2 and the non-display substrate 3 are not connected. Electric lines of force are formed, and the white particles 6A and the black particles 6B can move smoothly along the lines of electric force. Depending on the voltage to be applied, either the white particles 6 </ b> A or the black particles 6 </ b> B adhere to the display substrate 2, whereby a desired particle color is displayed through the display substrate 2. As the humidity in the cell 4 increases, the adhesion between the particles 6A and 6B and the particles 6A and 6B and the inner surfaces of the substrates 2 and 3 increases due to the liquid crosslinking force, and the charged particles 6A and 6B move smoothly. Therefore, it is necessary to prevent an increase in humidity for stable display.

(Effects of the first embodiment)
According to the first embodiment, the particles 6A and 6B filled in the gap 5a formed between the display substrate 2 and the partition member 5 have different charging characteristics and thus aggregate with each other to block the gap 5a. Furthermore, since the particles 6A and 6B are filled in the gap 5a together with the adhesive, the gap 5a is almost eliminated. As a result, the particles 6A and 6B cannot move between the cells 4, and uneven distribution of the particles 6A and 6B can be prevented, and a high-quality image with little image unevenness can be displayed. Further, since the gap 5a can be filled using the same particles 6A and 6B as the display particles 6A and 6B, the image display medium 1 can be easily manufactured.

[Second Embodiment]
FIG. 4 shows a main part of an image display medium according to the second embodiment of the present invention. In the second embodiment, a partition member 5 is provided on the display substrate 2 side, and a particle group including white particles 6A and black particles 6B together with an adhesive in a gap 5a generated between the partition member 5 and the display substrate 2 is provided. The others are configured in the same manner as in the first embodiment. According to the fourth embodiment, the colors of the particles 6A and 6B filled in the gap 5a can be hidden, and image quality deterioration can be prevented.

[Third embodiment]
FIG. 5 shows a main part of an image display medium according to the third embodiment of the present invention. In the third embodiment, the first partition member 5A is provided on the display substrate 2 side, the second partition member 5B is provided on the non-display substrate 3 side, and the first and second partition members 5A and 5B are provided. The gap 5a in which the particles are formed is filled with a particle group composed of white particles 6A and black particles 6B together with an adhesive, and the others are configured in the same manner as in the first embodiment. According to the third embodiment, since the heights of the partition members 5A and 5B are reduced, the height dimension accuracy is improved, and the surface accuracy of the end surfaces on the joining side is improved.

[Fourth embodiment]
FIG. 6 is a schematic diagram of an image display medium according to the fourth embodiment of the present invention. This fourth embodiment is provided with a pressing mechanism for pressing the display substrate 2 toward the non-display substrate 3 in the first embodiment, and the other configuration is the same as that of the first embodiment. ing. The pressing mechanism includes a display-side pressing plate 10 made of translucent resin, glass or the like that contacts the surface of the display substrate 2, a reinforcing metal fitting 11 that reinforces the periphery of the display-side pressing plate 10, and the non-display substrate 3. A screw hole 12a provided in the non-display-side pressing plate 12 by inserting a bolt 13 into the non-display-side pressing plate 12 that is in contact with the bottom surface of the display plate, and openings 10a, 11a provided in the display-side pressing plate 10 and the reinforcing metal fitting 11, respectively. And a bolt 13 to be screwed onto the screw. According to the fourth embodiment, the gap 5a generated between the partition member 5 and the display substrate 2 is filled with the particle group, and the particles 6A and 6B between the cells are reliably formed by the pressing force of the pressing mechanism. The movement can be prevented.

[Fifth embodiment]
FIG. 7 is a schematic diagram of an image display medium according to the fifth embodiment of the present invention. This fifth embodiment is provided with a seal member 15 that holds the space between the substrates 2 and 3 at a pressure lower than the atmospheric pressure in the first embodiment, and the others are the same as those in the first embodiment. It is comprised similarly to a form. An exhaust hole 14 is formed in the outer wall of the partition member 5 and the sealing member 7 covering the wall, and after the space between the substrates 2 and 3 is reduced to a pressure lower than the atmospheric pressure by an exhaust pump (not shown), the exhaust hole 14 Is sealed with a seal member 15. According to the fifth embodiment, the gap 5a formed between the partition member 5 and the display substrate 2 is filled with the particle group, and the space between the substrates 2 and 3 is maintained at a pressure lower than the atmospheric pressure. By doing so, it is possible to reliably prevent the movement of the particles 6A and 6B between the cells.

[Other embodiments]
In addition, this invention is not limited to said each embodiment, A various deformation | transformation implementation is possible within the range which does not change the summary. For example, in the above embodiment, the particles 6A and 6B are filled in the gap 5a between the display substrate 3 and the partition member 5 by the electric field formed by applying a voltage between the electrodes, but the entire image display medium 1 is vibrated. Then, the particles 6A and 6B may be filled in the gap 5a between the display substrate 3 and the partition member 5. Alternatively, the electrodes provided in the image display medium are not used, and the particles 6A and 6B are separated from the display substrate 3 and the partition member 5 by an electric field formed by applying a voltage between electrodes prepared outside the image display medium. 5a may be filled.

  Moreover, although it was set as the structure which contains an adhesive agent with the particle group in the clearance gap 5a, only particle group may be sufficient and adhesive agents, such as an acrylic adhesive and a rubber adhesive, may be used besides an adhesive agent.

  In addition, when the image display medium is a color display using three colors of RGB or CMY as one pixel, the cell may be configured to partition the pixel into three color regions.

  Moreover, a thick partition member may be used for each of a plurality of cells. Thereby, required intensity | strength is securable.

  In the above embodiment, the electrodes 21 and 31 are a combination of a row electrode and a column electrode. However, a combination of a full surface electrode and a pixel electrode, a combination of pixel electrodes, or a row electrode or a column electrode and a pixel. A combination with electrodes may also be used.

(A) is sectional drawing of the image display medium based on the 1st Embodiment of this invention, (b) is the sectional view on the AA line in (a), (c) is principal part sectional drawing. (A)-(c) is sectional drawing which shows an example of the assembly method of the image display medium based on the 1st Embodiment of this invention. (A)-(d) is sectional drawing for demonstrating the display operation of the image display medium based on the 1st Embodiment of this invention. It is principal part sectional drawing of the image display medium which concerns on the 2nd Embodiment of this invention. It is principal part sectional drawing of the image display medium which concerns on the 3rd Embodiment of this invention. It is a schematic diagram of the image display medium which concerns on the 4th Embodiment of this invention. It is a schematic diagram of the image display medium which concerns on the 5th Embodiment of this invention. It is sectional drawing for demonstrating the problem of the conventional image display medium.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Image display medium 2 Display substrate 3 Non-display substrate 4 Cell 5 Partition member 5A 1st partition member 5B 2nd partition member 6A White particle 6B Black particle 7 Sealing member 8 Voltage application part 10 Display side press board 10a Opening 11 Reinforcing metal fitting 11a Opening 12 Non-display side pressing plate 12a Screw hole 13 Bolt 14 Exhaust hole 15 Seal member 20 Display substrate member 21 Row electrode 22 Dielectric film 30 Non-display substrate member 31 Column electrode 32 Dielectric film

Claims (11)

A first substrate having a first electrode;
A second substrate having a second electrode;
A partition member that holds the first substrate and the second substrate facing each other and partitions a space between the first and second substrates in a direction parallel to the substrate to form a plurality of cells. When,
Each of the plurality of cells is sealed, and is moved between the first and second substrates by an electric field based on an applied voltage between the first and second electrodes, and is passed through the first or second substrate. A plurality of particle groups for display having different colors and charging characteristics for displaying images;
An image display medium comprising: a plurality of particle groups for filling, which are filled in a gap generated at a partition position by the partition member and have different colors and charging characteristics. The partition member is provided on the first or second substrate,
The gap is formed between the first or second substrate provided with the partition member and the second or first substrate not provided with the partition member. The image display medium according to claim 1. The partition member comprises a first partition member provided on the first substrate and a second partition member provided on the second substrate,
The image display medium according to claim 1, wherein the gap is generated between the first and second partition members.   The image display medium according to claim 1, wherein the gap includes an adhesive or a pressure-sensitive adhesive. A first substrate having a first electrode;
A second substrate having a second electrode;
A partition member that holds the first substrate and the second substrate facing each other and partitions a space between the first and second substrates in a direction parallel to the substrate to form a plurality of cells. When,
Each of the plurality of cells is sealed, and is moved between the first and second substrates by an electric field based on an applied voltage between the first and second electrodes, and is passed through the first or second substrate. A plurality of particle groups for display having different colors and charging characteristics for displaying images;
A plurality of particle groups for filling with different colors and charging characteristics filled in gaps generated at the partition positions by the partition members;
An image display medium comprising: a pressing unit that presses the first substrate toward the second substrate. A first substrate having a first electrode;
A second substrate having a second electrode;
A partition member that holds the first substrate and the second substrate facing each other and partitions a space between the first and second substrates in a direction parallel to the substrate to form a plurality of cells. When,
Each of the plurality of cells is sealed, and is moved between the first and second substrates by an electric field based on an applied voltage between the first and second electrodes, and is passed through the first or second substrate. A plurality of particle groups for display having different colors and charging characteristics for displaying images;
A plurality of particle groups for filling with different colors and charging characteristics filled in gaps generated at the partition positions by the partition members;
An image display medium comprising: a seal member that holds the space between the first and second substrates at a pressure lower than atmospheric pressure. The first substrate having the first electrode and the second substrate having the second electrode are opposed to each other and held by the partition member, and the space between the first and second substrates is A plurality of cells are formed by partitioning in a direction parallel to the substrate,
The color and charging characteristics for displaying a predetermined image through the first or second substrate by moving between the first and second substrates by an electric field based on an applied voltage between the first and second electrodes. In the method for manufacturing an image display medium in which a plurality of different particle groups are sealed in the plurality of cells,
The holding of the first and second substrates by the partition member includes a step of filling a part of the particle group into a gap generated at a partition position.   The method of manufacturing an image display medium according to claim 7, wherein the step is performed by applying vibration to the particle group.   8. The method of manufacturing an image display medium according to claim 7, wherein the step is performed by applying an electric field based on voltage application between the first and second electrodes, or an external electric field.   The method of manufacturing an image display medium according to claim 7, wherein the step involves pressing the first substrate toward the second substrate.   8. The method of manufacturing an image display medium according to claim 7, wherein the step is accompanied by pressure reduction in the space between the first and second substrates.

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