JP2005242207A - Image display medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image display medium capable of displaying an image free from image unevenness and having high quality by preventing maldistribution of particles. <P>SOLUTION: The image display medium 1 is provided with a front substrate 2 and a rear substrate 3 disposed opposite to each other at a prescribed interval, first partition walls 50 extending from the front substrate 2 toward the rear substrate 3, second partition walls 51 extending from the rear substrate 3 toward the second substrate 2 so as to come close to or come into contact with wall surfaces of the partition walls 50, and two kinds of particle groups encapsulated in a plurality of cells 4 partitioned by the first and the second partition walls 50 and 51 between the front substrate 2 and the rear substrate 3 and consisting of white particles 6A and black particles 6B moved in the cells 4 according to an applied electric field and having colors and charge characteristics different from each other. The particles 6A and the particles 6B are not moved between cells 4 since overlapping parts are formed on the tip sides of the first and the second partition walls 50 and 51. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an image display medium that can be rewritten repeatedly, and more particularly to an image display medium that can prevent uneven distribution of particles and display a high-quality image with little image unevenness.

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

  FIG. 13 is a schematic diagram of the image display medium. In this image display medium, a surface substrate 2 having translucency in which a row electrode 21 formed on a surface substrate member 20 is protected by a dielectric film 22 and a column electrode 31 formed on a back substrate member 30 are dielectrically formed. The rear substrate 3 protected by the body film 32, the front substrate 2 and the rear substrate 3 are held opposite to each other, and a space between the substrates 2 and 3 is partitioned in a direction parallel to the substrates 2 and 3 to form a plurality of cells. 4, partitioning member 5 that forms 4, negatively charged white particles 6 </ b> A accommodated in each cell 4, positively charged black particles 6 </ b> B made of toner, and an adhesive that seals the periphery of partitioning member 5. And a sealing member 8. 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 toward the surface substrate 2 or the back substrate 3, and an image is displayed through the surface substrate 3 by the contrast between the white particles 6A and the black particles 6B attached to the inside of the surface substrate 3.

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.

  Accordingly, an object of the present invention is to provide an image display medium capable of displaying a high-quality image with less unevenness by preventing uneven distribution of particles.

  In order to achieve the above object, the present invention provides first and second substrates that are arranged to face each other at a predetermined distance, and a first partition wall that extends from the first substrate toward the second substrate. A second partition wall extending from the second substrate toward the first substrate so as to be close to or in contact with the wall surface of the first partition wall, and the first between the first and second substrates. And a plurality of types of particle groups that are enclosed in a plurality of cells partitioned by the first and second partition walls and that move in the cells according to an applied electric field and have different colors and charging characteristics. An image display medium is provided.

  In order to achieve the above-mentioned object, the present invention provides a first and second substrates that are arranged to face each other at a predetermined distance, a partition wall that extends from one of the first and second substrates toward the other, Provided in the electric field applied to the other substrate, each of which is enclosed in a plurality of cells partitioned by a recess that accommodates the tip of the partition wall and the partition wall between the first and second substrates. Accordingly, there is provided an image display medium comprising a plurality of types of particle groups having different colors and charging characteristics that move in the cells.

  According to the image display medium of the present invention, it is possible to eliminate a gap in which particles can move between the first and second partition walls or between the partition wall and the other substrate, so that there is no movement of particles between cells. Therefore, it is possible to prevent uneven distribution of particles and display a high-quality image with little image unevenness.

[First Embodiment] (Overall Configuration of Image Display Medium)
1A and 1B show an image display medium according to a first embodiment of the present invention, in which FIG. 1A is a cross-sectional view taken along line B-B in FIG. 1C, FIG. It is an AA line sectional view of). As shown in FIGS. 1A and 1B, the image display medium 1 includes a front substrate 2 as a first substrate, a rear substrate 3 as a second substrate, a front substrate 2 and a rear substrate 3. And a partition member 5 made of a thermosetting resin that partitions the space between the substrates 2 and 3 in a direction parallel to the substrates 2 and 3 to form m × n cells 4, and The cell 4 includes two types of particle groups including white particles 6A and black particles 6B having different colors and charging characteristics, and a sealing member 8 that seals the outer periphery of the partition member 5. .

  In FIG. 1C, the particles 6A and 6B are not shown. Further, although FIG. 1 illustrates the number of cells as 8 × 8 = 16, it is not limited to this number. In this 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. There may be multiple pixels in one cell.

(Configuration of each part of the image display medium)
As shown in FIGS. 1A to 1C, the partition member 5 is provided on the first substrate wall 50 having a height h provided on the inner side of the front substrate 2 and on the back substrate 3 side. A plurality of square cylindrical second partition walls 51 having a height h, and a height H provided around the second partition walls 51 and bonded to the surface substrate 2 by the adhesive 7. And holding wall 52. The height of the first partition wall 50 and the second partition wall 51 may be different. Further, the first partition wall 50 having the height H and the second partition wall 51 having the height h may be provided, and the holding wall 52 may not be provided. In addition, the first partition wall 50 having the height H and the back substrate 3 can be joined by the adhesive 7. The second partition wall 51 having the height H and the surface substrate 2 can be bonded by the adhesive 7. In a state in which the front substrate 2 and the rear substrate 3 are joined by the holding wall 52, each second partition wall 51 is formed by the first partition wall 50 as shown in FIGS. Is accommodated in each of the holes 50a. In this state, as shown in FIG.1 (b), the 1st partition wall 50 and the 2nd partition wall 51 are located so that wall surfaces may adjoin or contact, and the overlap part of length L is formed. Thus, the particles 6A and 6B do not move between the cells 4.

  The surface substrate 2 includes a surface substrate member 20 made of a transparent glass substrate or the like, a plurality of transparent strip-like row electrodes 21 made of indium tin oxide (ITO) or the like formed on the surface substrate member 20, and the row electrodes 21. And a dielectric film 22 made of polycarbonate or the like that protects the particles 6A and 6B and stabilizes the charging characteristics of the particles 6A and 6B.

  As the front 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 row electrode 21 has a light-transmitting oxide such as indyllium, tin, cadmium, and antimony, a composite oxide thereof, and a single layer film such as gold, silver, copper, carbon, nickel, etc. Alternatively, a mixed film or a 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, polymethyl methacrylate (PMMA), co-polymer, depending on the charging characteristics of the particles 6A and 6B sealed in the cell 4. Polymerized nylon, ultraviolet curable acrylic 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 back substrate 3 is composed of a back substrate member 30 made of epoxy resin or the like, a plurality of strip-like column electrodes 31 made of copper or the like formed on the back substrate member 30, and the column electrodes 31 and the particles 6A and 6B. A dielectric film 32 made of polycarbonate or the like that stabilizes the charging characteristics is laminated. As the back substrate member 30, a substrate similar to the front substrate member 20 of the front substrate 2 may be used. The dielectric film 32 can be made of a material corresponding to the charging characteristics of the particles 6A and 6B to be enclosed in the cell 4, similarly to the dielectric film 22 of the surface 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.

  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 dielectric films 22 and 32 are polycarbonate resin, the average charge amount of the white particles 6A is -16 fC, and the average charge amount of the black particles 6B 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 surface substrate 2 is formed by sputtering an ITO film on a surface substrate member 20 made of transparent glass having a thickness of 2 mm, for example, and etching the ITO film into a predetermined pattern to form a plurality of row electrodes 21. 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.

  For example, the first partition wall 50 is formed by screen-printing ink made of a thermosetting resin on the dielectric film 22 of the surface substrate 2 and heating and baking it at 110 ° C. in an oven. It is fabricated on the surface substrate 2 by repeating a plurality of times until reaching h.

  For the back substrate 3, for example, a copper film is bonded onto a back 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. A dielectric film 32 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 a polycarbonate resin is dissolved in 45 parts by weight of monochlorobenzene and drying.

  The second partition wall 51 and the holding wall 52 are, for example, screen-printed with an ink made of a thermosetting resin on the dielectric film 32 of the back substrate 3 and heated to 110 ° C. in an oven for baking. These are repeated on the back substrate 3 by repeating a plurality of times until the desired heights h and H are obtained.

  FIG. 2 shows a state in which the first partition wall 50 is formed on the dielectric film 22 of the front substrate 2, and FIG. 3 shows the second partition wall 51 and the holding on the dielectric film 32 of the back substrate 3. The state in which the wall 52 is produced is shown. When the surface substrate 3 on which the first partition wall 50 is fabricated and the back substrate 3 on which the second partition wall 51 and the holding wall 52 are fabricated are assembled, the length a of one side shown in FIG. The tip of the second partition wall 51 enters the hole 50a having the length a of one side shown in FIG. 2, and forms an overlapping portion having a length L, as shown in FIG. In FIG. 2, b represents the thickness of the first partition wall 50, and in FIG. 3 b represents the gap between the second partition walls 51. Moreover, the hole 50a may not be square but may be rectangular.

  The white particles 6A are, for example, spherical fine particles of titanium oxide-containing crosslinked polymethyl methacrylate having a volume average particle diameter 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 action of suppressing the chargeability of the particles to an appropriate level and keeping the fluidity of the particles at a high level. The amount of titania-treated titania fine powder added is appropriately adjusted according to 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) Assembling of each part Assembling of the surface substrate 2 having the first partition wall 50, the back substrate 3 having the second partition wall 51 and the holding wall 52, and the particles 6A and 6B manufactured as described above. explain.

  First, the white particles 6A charged by friction charging or the like 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 on the back substrate 3. The screen is shaken off through the screen to the opening 51a of the second partition wall 51 formed in the above. The white particles 6A and the black particles 6B attached to the upper surface of the second partition wall 51 are removed with a silicon rubber blade.

  Next, the adhesive 7 is applied to the upper surface 52 a of the holding wall 52 or the surface of the surface substrate 3 in contact with the upper surface 52 a of the holding wall 52, and the dielectric film 22 side of the front substrate 2 and the dielectric film 32 of the rear substrate 3. The sides are overlapped and fixed with clamps or clips. Examples of the adhesive 7 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, and vinyl alcohol component weights. An air-resistant resin such as a coalescence can be used.

  Next, the outer periphery of the holding wall 52 is sealed with the sealing member 8. As the sealing member 8, a thermosetting resin, a UV curable resin, a thermoplastic resin, a gas-resistant resin, or the like similar to the adhesive 7 that bonds the holding wall 52 and the surface substrate 2 can be used.

(Display operation of image display medium)
(1) Display Operation of One Cell 4 FIG. 4 shows a display operation of one cell (pixel) 4 of the image display medium 1. A positive pulse voltage (for example, + 40V) is applied as the selection voltage Vsw from the voltage application unit 9 to the row electrode 21 of the front substrate 2, and a negative pulse voltage (for example, −40V) is applied as the image voltage Vdw to the column electrode 31 of the back substrate 3. 4A, since the white particles 6A are negatively charged as shown in FIG. 4A, they move to the surface substrate 2 side, and the black particles 6B are positively charged. Move to.

  When the application of the voltage to the row electrode 21 and the column electrode 31 is stopped in the state of FIG. 4A, even if the application of the voltage is stopped, as shown in FIG. Since the electric field is maintained, the white particles 6A are held on the front substrate 2 side, and the black particles 6B are held on the back substrate 3 side.

  Next, when a negative pulse voltage (for example, −40V) is applied as the selection voltage Vsb from the voltage application unit 9 to the row electrode 21, and a positive pulse voltage (for example, + 40V) is applied as the image voltage Vdb to the column electrode 31, FIG. As shown in FIG. 4C, since the white particles 6A are negatively charged, they move to the back substrate 3, and the black particles 6B move positively, so they move to the front substrate 2.

  When the application of voltage to the row electrode 21 and the column electrode 31 is stopped in the state of FIG. 4C, even if the application of voltage is stopped, as shown in FIG. Since the electric field is maintained, the white particles 6A are held on the back substrate 3 side, and the black particles 6B are held on the front substrate 2 side.

  Since the shape of the particles 6A and 6B used in the present embodiment is almost 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 performed. Is also point contact. 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. 4A and 4C, when a DC voltage is applied between the electrodes 21 and 31 by the voltage application unit 9, there is no electrical connection between the front substrate 2 and the rear substrate 3. Force lines 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 surface substrate 2, thereby displaying a desired particle color through the surface substrate 2.

(2) Display Operation of Entire Image Display Medium 1 FIG. 5 shows the voltage application unit 9. The voltage application unit 9 includes a row electrode drive circuit 90 that applies selection voltages Vsw and Vsb to the row electrode 21, a column electrode drive circuit 91 that applies image voltages Vdw and Vdb to the column electrode 31, and drive circuits 90 and 91. And a drive control circuit 92 for controlling the drive, and the drive is performed by a simple matrix drive system. When the drive control circuit 92 controls the drive circuits 90 and 91 according to the image signal, the row electrode drive circuit 90 applies the selection voltage Vsw or the selection voltage Vsb to the row electrode 21, and the column electrode drive circuit 91 Image voltage Vdw or image voltage Vdb is applied. For pixels displaying white, the selection voltage Vsw is applied to the corresponding row electrode 21 and the image voltage Vdw is applied to the corresponding column electrode 31. In addition, the selection voltage Vsb is applied to the corresponding row electrode 21 and the image voltage Vdb is applied to the corresponding column electrode 31 in the pixel displaying black.

  For example, in the figure, when the two pixels a and b in the second row, the second column, and the second row and the fourth column shown by hatching are displayed in black, the row electrode 21 in the second row is selected. A negative pulse voltage (for example, −40 V) is applied as the voltage Vsb, and a positive pulse voltage (for example, +40 V) is applied as the image voltage Vdb to the column electrodes 31 of the second column and the fourth column in synchronization therewith. Then, black is displayed on these two pixels a and b. Similarly, when these two pixels a and b are displayed in white, a positive pulse voltage (for example, +40 V) is applied to the row electrode 21 of the second row as the selection voltage Vsw, and the second column and the fourth column are synchronized with this. A positive pulse voltage (for example, −40 V) is applied as the image voltage Vdw to the column electrode 31 of the column. Then, white is displayed on these two pixels a and b. In this way, an image corresponding to the image signal is displayed on the image display medium 1.

(Effects of the first embodiment)
According to the first embodiment, since the overlapping portion is formed on the front end side of the first partition wall 50 provided on the front substrate 2 side and the second partition wall 51 provided on the back substrate 3 side, The movement of the particles 6A and 6B between the cells 4 is eliminated, and the uneven distribution of the particles 6A and 6B can be prevented, and a high-quality image with little image unevenness can be displayed.

[Second Embodiment]
FIG. 6 shows an image display medium according to the second embodiment of the present invention. In the first embodiment, the rear substrate 3 is joined to the front substrate 2 by the retaining wall 51 provided near the periphery of the rear substrate 3, but as shown in FIG. The rear substrate 3 may be bonded to the front substrate 2 and the adhesive 7 by 51 as well. According to the second embodiment, the movement of particles between cells can be prevented, and the strength of the entire medium is improved.

[Third Embodiment]
FIG. 7 shows a main part of an image display medium according to the third embodiment of the present invention. In the first embodiment, the partition walls 50 and 51 are provided on both the front substrate 2 and the rear substrate 3. However, as shown in the figure, the partition wall 53 is provided only on the front substrate 2 side. A recess 32 a may be formed on the surface of the back substrate 3 corresponding to 53, and the leading end 53 a of the partition wall 53 may be fitted into the recess 32 a so that variations in the height of the partition wall 53 can be absorbed. According to the third embodiment, the movement of particles between cells can be prevented, and the partition wall 53 is only formed on one substrate 2, so that the partition wall 53 can be easily manufactured. The partition wall may be provided on the back substrate 3 side, and the recess may be provided on the front substrate 2 side.

[Fourth Embodiment]
FIG. 8 shows a main part of an image display medium according to the fourth embodiment of the present invention. In the fourth embodiment, a lattice-shaped first partition wall 50 is formed on the front substrate 2 side, and a lattice-shaped second partition wall 51 is formed on the back substrate 3 side, so that the second partition is formed. A recess 51a is formed on the upper surface of the wall 51 so that the tip 50c of the first partition wall 50 is fitted into the recess 51a. This configuration can also prevent the movement of particles between cells.

[Fifth Embodiment]
FIG. 9 shows a main part of an image display medium according to the fifth embodiment of the present invention. In the fifth embodiment, a lattice-shaped first partition wall 50 is formed on the surface substrate 2 side, and a lattice-shaped second partition wall 51 is also formed on the back substrate 3 side. A concave portion 51a is formed on the upper surface of the wall 51, and a convex portion 50b is formed on the lower surface of the first partition wall 50. The convex portion 50b enters the concave portion 51a. This configuration can also prevent the movement of particles between cells.

[Sixth Embodiment]
FIG. 10 shows a main part of an image display medium according to the sixth embodiment of the present invention. In the sixth embodiment, the tips of the first and second partition walls 50 and 51 are rounded in the first embodiment, and the rest is configured in the same manner as in the first embodiment. ing. According to the sixth embodiment, the movement of particles between cells can be prevented, and the end portions 50c and 51c of the partition walls 50 and 51 are formed in a round shape. It becomes easy to insert between the second partition walls 51.

[Seventh Embodiment]
FIG. 11 shows a main part of an image display medium according to the seventh embodiment of the present invention. In the seventh embodiment, the height h ₁ of the first partition wall 50 is brought close to the height H of the holding wall 52 (the distance between the front substrate 2 and the rear substrate 3), and the height of the second partition wall 51 is increased. are those that are low h _2, others are configured similarly to the first embodiment. This configuration can also prevent the movement of particles between cells. Note that the height of the second partition wall 51 may be close to the height of the holding wall 52 and the height of the first partition wall 50 may be reduced.

[Eighth Embodiment]
FIG. 12 shows a main part of an image display medium according to the eighth embodiment of the present invention. In the eighth embodiment, the hole 50a of the first partition wall 50 is a rectangle (a ₁ × a ₂ ), and the second partition wall is a rectangle (a ₁ × a ₂ ) accordingly. It is. In this case, one thickness b ₁ and the other thickness b _{2 of} the first partition wall 50 may be different values or the same value. Similarly, it may be the same value or a different value than the one of the gap b ₁ and the other gaps b ₂ of the second partition wall 51. Also with this configuration, movement of particles between cells can be prevented, and when a plurality of pixels are provided in one cell, the number of vertical and horizontal pixels can be made different.

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

  The electrodes 21 and 31 may have column electrodes on the front substrate 2 and row electrodes on the rear substrate. In the above embodiment, a combination of row electrodes and column electrodes is used. An active matrix driving method may be employed using a combination with electrodes.

The image display medium according to the first embodiment of the present invention includes (a) a cross-sectional view taken along the line BB of (c), (b) a cross-sectional view of an essential part, and (c) an A- It is A sectional view. It is a top view of the surface board concerning a 1st embodiment of the present invention. It is a top view of the back substrate concerning a 1st embodiment of the present invention. (A)-(d) is sectional drawing for demonstrating the display operation | movement of one cell of the image display medium based on the 1st Embodiment of this invention. It is a block diagram of the voltage application part which concerns on the 1st Embodiment of this invention. It is a fragmentary sectional view 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 principal part sectional drawing of the image display medium which concerns on the 4th Embodiment of this invention. It is principal part sectional drawing of the image display medium which concerns on the 5th Embodiment of this invention. It is principal part sectional drawing of the image display medium which concerns on the 6th Embodiment of this invention. It is principal part sectional drawing of the image display medium which concerns on the 7th Embodiment of this invention. (A), (b) is principal part sectional drawing of the image display medium based on the 8th 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 Front substrate 3 Back substrate 4 Cell 5 Partition member 6A White particle 6B Black particle 7 Adhesive 8 Sealing member 9 Voltage application part 20 Surface substrate member 21 Row electrode 22 Dielectric film 30 Back substrate member 31 Column electrode 32 Dielectric film 32a Recess 50 First partition wall 50a Hole 50b Projection 50c Tip 51 Second partition wall 51a Opening 51b Recess 51c Tip 52 Holding wall 52a Upper surface 53 Partition wall 53a Tip 90 Row electrode drive circuit 91 Column electrode drive circuit 92 Drive controller

Claims (5)

First and second substrates disposed opposite to each other with a predetermined distance;
A first partition wall extending from the first substrate toward the second substrate;
A second partition wall extending from the second substrate toward the first substrate so as to be close to or in contact with the wall surface of the first partition wall;
The plurality of cells defined by the first and second partition walls between the first and second substrates are respectively enclosed, and the color and charging characteristics of moving in the cells differ according to the applied electric field. An image display medium comprising a plurality of types of particle groups.   2. The image according to claim 1, wherein one of the first and second partition walls has a lattice shape, and the other has a plurality of cylindrical shapes received in the plurality of lattice-shaped openings. Display medium.   2. The image display medium according to claim 1, wherein one of the first and second partition walls has a convex portion at a tip, and the other has a concave portion in which the convex portion is accommodated at the tip.   The image display medium according to claim 1, wherein at least one of the first and second partition walls has a rounded shape at the tip. First and second substrates disposed opposite to each other with a predetermined distance;
A partition wall extending from one of the first and second substrates toward the other;
A recess provided in the other substrate and accommodating a tip of the partition wall;
A plurality of types of particle groups that are encapsulated in a plurality of cells partitioned by the partition wall between the first and second substrates, and that move in the cells according to an applied electric field and have different colors and charging characteristics; An image display medium comprising: