JP2011154202A - Electrophoretic display medium and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrophoretic display medium, which suppresses aggregation or uneven distribution of electrophoretic particles in the medium, maintains a constant gap between two opposing substrates, and can be easily produced, and to provide a method for producing the medium. <P>SOLUTION: The method for producing an electrophoretic display medium includes the steps of: forming a front side electrode substrate by forming a plurality of cells comprising insulating structures standing on the surface of a light-transmitting first electrode layer formed on a light-transmitting first substrate; filling the cell with an electrophoretic ink; forming a back side electrode substrate by forming a conductive adhesive layer on the surface of a first electrode layer formed on a second substrate; and disposing the front side electrode substrate and the back side electrode substrate to oppose to each other, and making the upper face of the structure adhere to the adhesive layer to seal the electrophoretic ink in the cells. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electrophoretic display medium capable of reversibly changing a visual state by the action of an electric field or the like and a method for manufacturing the same.

  In recent years, demands for reducing power consumption, thinning and weight reduction, flexibility, etc. of display displays have been increasing, and electronic paper has attracted attention as one of them. An electrophoretic display medium is known as one of such electronic papers. In the electrophoretic display medium, two electrode substrates, at least one of which is transparent, are arranged so as to face each other through a spacer, and an electrophoretic ink in which electrophoretic particles are dispersed is filled between the opposed electrodes. The display panel is configured. A display is obtained on the transparent electrode surface by applying an electric field to the display panel.

  An electrophoretic display medium is a display medium that can obtain a desired display by controlling the direction of an electric field, is low in cost, has a viewing angle as wide as that of a normal printed material, consumes little power, and has a display memory property. It has attracted particular attention because it has advantages such as However, the electrophoretic particles used in the electrophoretic ink have the problem that the particles are likely to aggregate due to long-term storage, and the display is liable to deteriorate due to uneven distribution of particles during repeated display. Had.

  As a method for preventing display non-uniformity due to uneven distribution of electrophoretic particles on the display surface, aggregation and uneven distribution of particles are suppressed by filling electrophoretic ink into a large number of small chambers (cells) that are finely isolated. A method has been proposed (see Patent Documents 1 to 6).

  Moreover, in patent document 7, regarding the structure and manufacturing method of the cell, a cell filled with ink called microcup (registered trademark) is formed on a substrate by embossing or the like, and a sealing precursor is added after filling with electrophoresis ink. A method of sealing by overcoating has been proposed.

  However, in order to overcoat the sealing precursor, there is a problem that if the sealing precursor and the electrophoretic ink are not insoluble, the seal is poorly cured or the display is deteriorated due to a change in ink physical properties. In addition, density management between the sealing precursor and the electrophoretic ink is required, and when the density of the sealing precursor is larger than the density of the electrophoretic ink, there is a problem that the ink is submerged in the ink. Further, when an insulator is provided between the counter electrodes (for example, between the electrode and the ink), it is necessary to increase the applied voltage, and there is a problem that the drive voltage increases.

JP 2001-159765 A JP 2002-148862 A JP 2002-292736 A JP 2004-20640 A JP 2007-65288 A Japanese Patent No. 3966890 JP 2004-4773 A

  The present invention has been made in view of the above points, and provides an electrophoretic display medium capable of suppressing aggregation and uneven distribution of electrophoretic particles in the electrophoretic display medium and reducing a driving voltage, and a method for manufacturing the same. Is one of the purposes.

  In one embodiment of the method for producing an electrophoretic display medium of the present invention, an insulating structure standing on the surface of a light-transmitting first electrode layer provided on a light-transmitting first base material Forming a plurality of cells comprising a front side electrode substrate, filling the cells with electrophoretic ink, and a surface of the second electrode layer provided on the second substrate, A step of forming a conductive adhesive layer to form a back electrode substrate, and the front electrode substrate and the back electrode substrate are arranged to face each other to bond the upper surface of the structure and the adhesive layer. A step of sealing the electrophoretic ink in the cell.

  In one embodiment of the method for producing an electrophoretic display medium of the present invention, the plurality of cells made of an insulating structure are formed by forming an insulating layer on the surface of the first electrode layer, and patterning the insulating layer by a photolithography method. Is preferably formed.

  In one aspect of the method for producing an electrophoretic display medium of the present invention, the second electrode layer is preferably a common electrode.

  In one embodiment of the method for producing an electrophoretic display medium of the present invention, it is preferable that the first base material and the second base material are formed of a flexible substrate.

  One aspect of the electrophoretic display medium of the present invention includes a light-transmitting first substrate, a light-transmitting first electrode layer provided on the first substrate, and the first electrode. A front-side electrode substrate including a plurality of cells formed of an insulating structure on the surface of the layer, a second base material, a second electrode layer provided on the second base material, A back-side electrode substrate including a conductive adhesive layer provided on the surface of the second electrode layer; and an electrophoretic ink provided on the cell; and the upper surface of the structure and the adhesive Layers are adhered and the electrophoretic ink is sealed in the cells.

  In one embodiment of the electrophoretic display medium of the present invention, the second electrode layer is preferably a common electrode.

  In one embodiment of the electrophoretic display medium of the present invention, the first base material and the second base material are preferably provided using a flexible substrate.

  According to one embodiment of the present invention, it is possible to provide an electrophoretic display medium capable of suppressing aggregation and uneven distribution of electrophoretic particles in the electrophoretic display medium and reducing a driving voltage, and a method for manufacturing the same.

8A and 8B illustrate a method for manufacturing an electrophoretic display medium according to an embodiment. FIG. 6 illustrates an example of a structure of an electrophoretic display medium according to an embodiment. FIG. 6 illustrates an example of a structure of an electrophoretic display medium according to an embodiment.

  In the manufacturing method of the electrophoretic display medium described in this embodiment, the insulating structure is provided on the surface of the light-transmitting first electrode layer provided on the light-transmitting first substrate. Forming a front electrode substrate by forming a plurality of cells comprising: a step of filling the cells with electrophoretic ink; and a surface of the second electrode layer provided on the second base material. Forming a backside electrode substrate by forming an adhesive layer having a property, and arranging the front side electrode substrate and the backside electrode substrate so as to face each other and bonding the top surface of the structure and the adhesive layer, And sealing to the cell. Below, each process is demonstrated concretely with reference to drawings.

<Formation process of front side electrode substrate>
The front electrode substrate forming step includes a plurality of insulating structures 203 erected on the surface of the light transmissive first electrode layer 202 provided on the light transmissive first base material 201. The front side electrode substrate 200 is formed by forming the small chamber (cell) (see FIG. 1A). The plurality of cells 204 are separated from each other by a standing structure 203. The front-side electrode substrate 200 is an electrode substrate located on the surface (front surface) side to be visually recognized in the electrophoretic display medium. That is, the display of characters and the like formed with the electrophoretic ink is visually recognized through the first base material 201 and the first electrode layer 202. Therefore, the first base member 201 and the first electrode layer 202 are formed using a light-transmitting material. The structure 203 is sometimes referred to as a “rib” or a “spacer”.

The first substrate 201 is made of a transparent inorganic material such as glass, quartz, sapphire, MgO, LiF, or CaF _2, or a transparent organic polymer film or plate such as fluorine resin, polyester, polycarbonate, polyethylene, or polyethylene terephthalate. It can be formed using a body or the like.

The first electrode layer 202 can be formed using a transparent conductive material such as ITO, ZnO, or SnO ₂ . Further, conductive polymers such as PODET / PVS and PODET / PSS, and transparent conductive materials such as titanium oxide, zinc oxide, and tin oxide may be used. These materials can be formed by methods such as vapor deposition, ion plating, and sputtering. In addition, the first electrode layer 202 can be formed using a metal such as Al, Ni, Au, or the like that is thinned to the extent that it becomes translucent by vapor deposition or sputtering. The shape of the 1st electrode layer 202 can be suitably selected according to the shape of the 2nd electrode layer formed in a back side electrode substrate. Note that the first electrode layer 202 may be provided in contact with the first base material 201, or an element (such as a transistor) that drives an electrophoretic display medium is provided over the first base material 201. The first electrode layer 202 may be provided thereover.

  The structure 203 can be formed using a resin material such as a PET film. For example, a plurality of cells 204 can be formed by laser processing a synthetic resin such as a PET film having a certain thickness to form a shape such as a square, hexagon, or circle. In addition, after an insulating layer is formed over the first electrode layer 202, the plurality of cells 204 can be formed by patterning the insulating layer using a photolithography method. In addition, it is also possible to form a cell 204 made of a cross-shaped structure 203 by forming a thermoplastic resin on the first electrode layer 202 and using a method such as hot embossing.

  The shape of the cell 204 is not particularly limited, and various shapes such as a circle, a rectangle (rectangle, square), a hexagon, and the like can be obtained by controlling the position where the laser light is irradiated and the shape of a mask used in the photolithography method. Can be provided in any shape.

<Electrophoresis ink filling process>
In the electrophoretic ink filling step, the electrophoretic ink 205 is filled into the cell 204 formed over the first electrode layer 202 (see FIG. 1B).

  The electrophoretic ink 205 only needs to contain at least one kind of electrophoretic particles. For example, the electrophoretic ink 205 is formed of positively charged white particles, negatively charged black particles, and a dispersion medium in which these particles are dispersed. can do. As the white particles, white pigments such as titanium oxide, white resin particles, or resin particles colored in white can be used. As the black particles, black pigments such as titanium black and carbon black, resin particles colored black, and the like can be used. These particles can be arbitrarily used in various colors as long as the contrast can be displayed, and can be a combination of white and red, white and blue, yellow and black, and the like. Alternatively, only one type of charged particle such as only white particles or only black particles may be used.

<Backside electrode substrate forming process>
In the step of forming the back side electrode substrate, the back side electrode substrate 206 is formed by forming a conductive adhesive layer 209 on the surface of the second electrode layer 208 provided on the second base material 207. (See FIG. 1C). The back-side electrode substrate 206 is an electrode substrate located on the surface (back surface) opposite to the surface (front surface) to be visually recognized in the electrophoretic display medium. Therefore, the second base 207, the second electrode layer 208, and the conductive adhesive layer 209 are not necessarily formed using a light-transmitting material.

  The second base 207 can be formed using a polymer film, glass, quartz, ceramic, or the like.

The second electrode layer 208 is formed using a metal such as aluminum (Al), gold (Au), platinum (Pt), copper (Cu), silver (Ag), nickel (Ni), or chromium (Cr). be able to. In addition, it can be formed using a transparent conductive material such as ITO, ZnO, or SnO ₂ . The second electrode layer 208 may be a so-called common electrode (solid electrode) that is uniformly formed over the entire surface of the second base material 207, or may be an electrode patterned according to each pixel. The shape of the second electrode layer 208 can be appropriately selected according to the shape of the first electrode layer 202 formed on the front-side electrode substrate 200.

<Process for forming conductive adhesive layer>
Adhesive materials for forming the conductive adhesive layer 209 include ultraviolet curable adhesives, thermosetting adhesives, chemical reaction (crosslinking) adhesives, thermoplastic (hot melt) adhesives, conductive carbon black, An adhesive material formed by mixing carbon nanotubes, metal fine particles, or the like can be used. In addition, conductive polymers such as polyacetylene and polythiophenes can be contained or used. Further, the adhesive material may be in a steady state, such as liquid, film, or solid. On the other hand, it is also possible to use a film having adhesiveness, which is usually called a double-sided tape. Note that the conductive adhesive layer refers to an adhesive layer having a resistivity of 1 × 10 ¹¹ Ω · cm or less, preferably 1 × 10 ⁴ Ω · cm or less.

  As a coating method of the adhesive layer having conductivity, for example, a spin coater, a die coater, a bar coater, screen printing, a gravure roll, etc. can be used as long as it is a liquid material in a steady state. If it is a material, an adhesive layer can be formed with a laminator or the like. Furthermore, if the steady state is a solid thermoplastic material, the adhesive layer can be formed with a die coater or the like while heating.

  The conductive adhesive layer 209 is formed between the first electrode layer 202 and the second electrode layer 208. Therefore, from the viewpoint of further reducing the voltage applied between the first electrode layer 202 and the second electrode layer 208 (driving voltage of the electrophoretic display medium), it is preferable to use a highly conductive material. In general, the conductive adhesive material is often colored, but in this embodiment mode, the conductive adhesive layer 209 is provided on the back-side electrode substrate 206, so that the conductive adhesive layer 209 is provided. Even when a colored conductive adhesive is used, it is possible to suppress the influence on the visibility of the electrophoretic display medium.

  Note that in the case where the adhesive layer 209 having conductivity is formed, the second electrode layer 208 formed in contact with the adhesive layer 209 having conductivity is preferably used as a common electrode. In this case, the first electrode layer 202 may be formed using a pattern electrode separated for each pixel. On the other hand, when the second electrode layer 208 is formed with the pattern electrodes separated for each pixel, the electrode pattern of the second electrode layer 208 is not connected between the electrodes of adjacent pixels on the same surface. Accordingly, it is preferable to selectively form the adhesive layer 209 having conductivity. In this case, an adhesive material having conductivity can be formed by screen printing or the like in accordance with the electrode pattern of the electrode layer 208.

  In addition, in the sealing step described later, when the electrophoretic ink 205 is filled up to the upper surface side of the cell 204, the conductive adhesive layer 209 formed on the second electrode layer 208 side and the electrophoretic ink 205 are formed. In order to make contact, the conductive adhesive layer 209 is made of a material that does not dissolve into the electrophoretic ink 205 and that does not affect the display of the electrophoretic display medium even when mixed. Is preferred. For example, a material that can form a barrier layer by interfacial polymerization between the electrophoretic ink 205 and the conductive adhesive layer 209 can be used.

<Sealing process>
In the sealing step, the electrophoretic ink 205 is sealed in the cell 204 by placing the front electrode substrate 200 and the back electrode substrate 206 facing each other and bonding the upper surface of the structure 203 and the adhesive layer 209 (FIG. 1). (See (D)). For example, sealing can be performed by the following method. 1) When the adhesive layer 209 having conductivity is formed of an ultraviolet curable resin, after the upper surface of the structure 203 and the adhesive layer 209 having conductivity are brought into contact, ultraviolet rays are irradiated from the front electrode substrate 206 side. Good. 2) In the case where the conductive adhesive layer 209 is formed of a thermosetting resin, a desired curing temperature is maintained while pressing the upper surface of the structure 203 and the conductive adhesive layer 209 with a desired load. To cure. 3) In the case where the conductive adhesive layer 209 is formed of a thermoplastic resin, the roller-like pressing is performed while the upper surface of the structure 203 and the conductive adhesive layer 209 are brought into contact with each other while a temperature higher than the softening point temperature is applied. After the first base material and the second base material are continuously pressed and bonded together with a body, the body is cooled and sealed. Note that the upper surface of the structure 203 refers to a surface of the structure 203 opposite to the surface in contact with the first electrode layer 202.

  In this manner, since the cell 204 is sealed by bonding the upper surface of the structure 203 and the adhesive layer 209 having conductivity, it is possible to suppress migration of the particles of the electrophoretic ink 205 to another cell. It becomes possible. In addition, by applying the manufacturing method shown in this embodiment mode, when bonding is performed after the adhesive layer is selectively formed on the top surface of the structure, the adhesive layer is formed directly on the electrophoretic ink (overflow). Compared with the case of coating), the process can be simplified and a stable electrode substrate interval can be formed.

  Through the above steps, an electrophoretic display medium can be manufactured. The electrophoretic display medium obtained in the present embodiment includes a light-transmitting first base material, a light-transmitting first electrode layer provided on the first base material, and a first electrode layer. A front-side electrode substrate including a plurality of cells formed of an insulating structure on the surface thereof, a second base material, a second electrode layer provided on the second base material, and a second A backside electrode substrate including a conductive adhesive layer provided on the surface of the electrode layer and an electrophoretic ink provided in the cell, and the upper surface of the structure and the adhesive layer adhere to each other for electrophoresis The ink is sealed in the cell. As described above, the adhesion between the upper surface of the structure and the adhesive layer suppresses the aggregation of the electrophoretic particles used in the electrophoretic ink and the uneven distribution in specific cells, as well as the opposing two. The distance between the substrates can be kept constant. In addition, an increase in driving voltage of the electrophoretic display medium can be suppressed by forming the adhesive layer using a conductive material. In addition, even when the first base material and the second base material are provided using a flexible substrate and the electrophoretic display medium is curved, the upper surface of the structure and the adhesive layer are bonded to each other. Thus, it is possible to prevent the electrophoretic ink provided in each cell from moving to another cell.

<Modification>
The electrophoretic display medium shown in this embodiment is not limited to the structure shown in FIG.

  In the step of forming the front-side electrode substrate 200, a plurality of cells 204 made of an insulating structure 203 are formed on the surface of the first electrode layer 202 provided on the first base 201, and at the same time, the first A structure 210 may be provided separately from the structure 203 that forms the cells 204 in the periphery of the base 201 (see FIG. 2). By adhering the structure 210 to the adhesive layer 209 provided on the back electrode substrate 206, the adhesion between the front electrode substrate 200 and the back electrode substrate 206 can be improved. In this case, since the structure 210 functions as a so-called sealing material, a step of separately forming the sealing material can be omitted. 2A shows a schematic diagram of the top surface, and FIG. 2B shows a schematic diagram of a cross section.

  Further, in the step of forming the front electrode substrate 200, the width of the structure 203 disposed on the outermost periphery when the plurality of cells 204 made of the insulating structure 203 are formed on the surface of the first electrode layer 202. (Area of the upper surface) may be formed large (see FIGS. 3A and 3B). By selectively increasing the width of the structure 203 arranged on the outermost side, the width (distance between the plurality of cells 204) of the structure 203 arranged on the inner side of the outermost periphery is not increased (high definition). In addition, the adhesion between the front electrode substrate 200 and the back electrode substrate 206 can be improved. Furthermore, it becomes possible to omit the process of forming the sealing material. 3A shows a schematic diagram of the upper surface, and FIG. 3B shows a schematic diagram of a cross section.

  FIG. 1 shows the case where the upper surface of the insulating structure 203 is formed flat, but the invention is not limited to this. For example, the insulating structure 203 may be formed so that the upper surface has a curved surface that protrudes upward. Accordingly, even when the electrophoretic ink 205 is filled up to the upper surface side of the cell 204, the electrophoretic ink 205 is suppressed from being accumulated on the upper surface of the structure 203, and the adhesive force between the structure 203 and the adhesive layer 209 is increased. It can suppress that it falls.

  In addition, this invention is not limited to the said embodiment, A various change can be implemented. In addition, the material, quantity, and the like in the above embodiment are examples, and can be changed as appropriate. In addition, the present invention can be appropriately modified and implemented without departing from the technical idea of the present invention.

  EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited to these Examples.

Example 1
First, after pasting a film resist agent on a light transmissive first base material having a light transmissive electrode formed on the surface, the first base material is subjected to a photoresist process. A structure was formed on the upper electrode. In this example, PET having a thickness of 125 μm, a haze of 10 or less, and a total light transmittance of 90% or more was used as the first substrate, and ITO having a surface resistance value of 200Ω / □ was formed on the PET as an electrode.

  Next, the first base material on which the structure is formed is placed on a die coater, and after applying electrophoretic ink to a predetermined position of the structure, a sealing adhesive is applied around the ink with a dispenser. As a result, a first base material coated with ink was prepared. As the sealing adhesive, an ultraviolet curable adhesive was used.

Moreover, after dripping a liquid electroconductive hot-melt-adhesive on the 2nd base material in which the electrode was formed on the surface, it was rotated at 2000 rpm for 5 seconds using a spin coater, and the electrode on the 2nd base material An adhesive layer was formed on top. As the liquid conductive hot-melt adhesive, PES-320SB adhesive (resistivity 1 × 10 ⁴ Ω · cm) manufactured by Toagosei Co., Ltd. was used. In addition, as a 2nd base material, the 12-micrometer-thick polyimide was used, copper foil was formed on the said polyimide, and this copper foil surface was gold-flash plated to make an electrode.

  Next, the first base material to which the ink is applied and the second base material on which the adhesive layer is formed are placed in a thermal laminator and bonded while being heated to a predetermined temperature (120 ° C.). The electrophoretic display medium was produced by irradiating the sealing adhesive applied around the substrate with ultraviolet rays.

(Comparative Example 1)
As Comparative Example 1, like Example 1, after a film resist agent was bonded onto a light-transmitting first base material having a light-transmitting electrode formed on the surface, a photoresist was applied to the film resist agent. The structure was formed on the electrode on the first substrate by applying the process. In this example, PET having a thickness of 125 μm, a haze of 10 or less, and a total light transmittance of 90% or more was used as the first substrate, and ITO having a surface resistance value of 200Ω / □ was formed on the PET as an electrode.

  Next, the first base material on which the structure is formed is placed on a die coater, and after applying electrophoretic ink to a predetermined position of the structure, a sealing adhesive is applied around the ink with a dispenser. As a result, a first base material coated with ink was prepared. As the sealing adhesive, an ultraviolet curable adhesive was used.

Moreover, after dripping a liquid electroconductive hot-melt-adhesive on the 2nd base material in which the electrode was formed on the surface, it was rotated at 2000 rpm for 5 seconds using a spin coater, and the electrode on the 2nd base material An adhesive layer was formed on top. As the liquid conductive hot-melt adhesive, PES-320SK adhesive (resistivity 1 × 10 ¹⁵ Ω · cm) manufactured by Toagosei Co., Ltd. was used. In addition, as a 2nd base material, the 12-micrometer-thick polyimide was used, copper foil was formed on the said polyimide, and this copper foil surface was gold-flash plated to make an electrode.

(Evaluation)
The display reflectivity was measured by applying 50 V to the produced electrophoretic display medium to drive the panel, and the ratio (contrast) was measured. As a result, the electrophoretic display medium of Example 1 had a display contrast of 8.7, whereas the electrophoretic display medium of Comparative Example 1 had a contrast of 0.57.

(Example 2)
First, after pasting a film resist agent on a light transmissive first base material having a light transmissive electrode formed on the surface, the first base material is subjected to a photoresist process. A structure was formed on the upper electrode. In this example, PET having a thickness of 125 μm, a haze of 10 or less, and a total light transmittance of 90% or more was used as the first substrate, and ITO having a surface resistance value of 200Ω / □ was formed on the PET as an electrode.

  Next, the first base material on which the structure is formed is placed on a die coater, and after applying electrophoretic ink to a predetermined position of the structure, a sealing adhesive is applied around the ink with a dispenser. As a result, a first base material coated with ink was prepared. As the sealing adhesive, an ultraviolet curable adhesive was used.

  Moreover, the adhesive layer was formed on the electrode on a 2nd base material by forming an electroconductive double-sided tape on the 2nd base material in which the electrode was formed in the surface. Here, after installing the 2nd base material and the electroconductive double-sided tape in the laminator, it provided on the electrode on the 2nd base material, peeling the protective film adhering to the surface of the electroconductive double-sided tape. As the conductive double-sided tape, No. 795 (8.3Ω · cm) manufactured by Teraoka Co., Ltd. and No. 7025 (2.8Ω · cm) manufactured by Teraoka Co., Ltd. were used. In addition, as a 2nd base material, the 12-micrometer-thick polyimide was used, copper foil was formed on the said polyimide, and this copper foil surface was gold-flash plated to make an electrode.

  Next, the first base material to which the ink is applied and the second base material on which the adhesive layer is formed are bonded to the laminator, and then the sealing adhesive applied around the ink is applied. An electrophoretic display medium was produced by irradiation with ultraviolet rays.

(Comparative Example 2)
As Comparative Example 2, a panel was prepared in the same manner as in Example 2 using a general double-sided tape (uni-sided tape (Mitsubishi Pencil Co., Ltd.), resistivity measurement not possible).

(Evaluation)
As a result of applying 50 V to the produced electrophoretic display medium and driving the panel, the electrophoretic display medium of Example 2 operated, but the electrophoretic display medium of Comparative Example 2 did not operate.

DESCRIPTION OF SYMBOLS 200 Front side electrode board 201 1st base material 202 1st electrode layer 203 Structure 204 Cell 205 Electrophoretic ink 206 Back side electrode board 207 2nd base material 208 2nd electrode layer 209 Adhesive layer which has electroconductivity 210 Structure

Claims (7)

A front electrode substrate is formed by forming a plurality of cells made of an insulating structure standing on the surface of the light transmissive first electrode layer provided on the light transmissive first base material. And a process of
Filling the cell with electrophoretic ink;
Forming a back-side electrode substrate by forming a conductive adhesive layer on the surface of the second electrode layer provided on the second substrate;
An electrophoretic display comprising: a step of sealing the electrophoretic ink to the cell by adhering the upper surface of the structure and the adhesive layer with the front electrode substrate and the back electrode substrate facing each other. A method for manufacturing a medium. In the step of forming the front electrode substrate,
2. The electrophoresis according to claim 1, wherein the plurality of cells including the insulating structure are formed by forming an insulating layer on a surface of the first electrode layer and patterning the insulating layer by a photolithography method. A method for manufacturing a display medium.   The method for manufacturing an electrophoretic display medium according to claim 1, wherein the second electrode layer is a common electrode.   The method for manufacturing an electrophoretic display medium according to claim 1, wherein the first base material and the second base material are formed of a flexible substrate. A light transmissive first base material, a light transmissive first electrode layer provided on the first base material, and an insulating structure formed on the surface of the first electrode layer. A front electrode substrate including a plurality of cells;
A back-side electrode substrate including a second base material, a second electrode layer provided on the second base material, and a conductive adhesive layer provided on the surface of the second electrode layer When,
An electrophoretic ink provided in the cell,
An electrophoretic display medium in which an upper surface of the structure and the adhesive layer are bonded to each other and the electrophoretic ink is sealed in the cell.   The electrophoretic display medium according to claim 5, wherein the second electrode layer is a common electrode. The electrophoretic display medium according to claim 5, wherein the first base material and the second base material are flexible substrates.

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