JP6028376B2 - Display sheet, display sheet manufacturing method, display device, and electronic apparatus - Google Patents

Description

  The present invention relates to a display sheet, a display sheet manufacturing method, a display device, and an electronic apparatus.

  2. Description of the Related Art Conventionally, an electrophoretic display device using particle electrophoresis has been known (see, for example, Patent Document 1). Such an electrophoretic display device is excellent in that it has excellent portability and power saving. The electrophoretic display described in Patent Document 1 has a pair of substrates arranged opposite to each other, and a display layer provided therebetween. The display layer is divided into a plurality of cells by partition walls, and each cell is filled with a dispersion liquid in which electrophoretic particles are dispersed in a dispersion medium.

  In such an electrophoretic display device, the partition wall and the substrate are bonded via an adhesive layer (adhesive). However, since the contact area between the partition walls and the substrate (that is, the area of the top surface of the partition walls) is small, the bonding strength between the partition walls and the substrate cannot be sufficiently increased. In Patent Document 1, a groove is formed on the top surface of the partition wall to increase the contact strength with the pressure-sensitive adhesive layer, but this is still insufficient. Therefore, for example, when a relatively large stress is applied due to the deformation of the electrophoretic display device, the partition wall is peeled off from the substrate, and the electrophoretic particles move between adjacent cells via the peeled portion. . Accordingly, there is a problem that the electrophoretic particles are biased and the display characteristics are deteriorated.

JP 2009-271387 A

  The objective of this invention is providing the display sheet which has the outstanding mechanical strength, the manufacturing method of a display sheet, a display apparatus, and a highly reliable electronic device.

Such an object is achieved by the present invention described below.
The display sheet of the present invention includes a first substrate provided on the display surface side,
A second substrate disposed opposite the first substrate;
An adhesive layer provided on the second substrate side of the first substrate;
A display layer provided between the adhesive layer and the second substrate,
The display layer includes a partition that divides the display layer into a plurality of regions, and a dispersion liquid in which at least one kind of positively or negatively charged particles filled in each region is dispersed in a dispersion medium. Have
An end of the partition on the first substrate side is embedded in the adhesive layer and is in contact with the first substrate, and a portion embedded in the adhesive layer is narrow. It has a width part and a 1st wide part located in the said 1st board | substrate side rather than the said narrow part, and wider than the said narrow part, It is characterized by the above-mentioned.
Thereby, the display sheet which has the outstanding mechanical strength is obtained.

In the display sheet of the present invention, it is preferable that the first wide portion is in contact with the first substrate.
Thereby, the bonding strength between the partition walls and the first substrate is increased, and the mechanical strength of the display sheet is further improved.
In the display sheet of the present invention, the portion embedded in the adhesive layer of the partition wall is located on the second substrate side than the narrow width portion, and the second wide width portion is wider than the narrow width portion. It is preferable to have.
Thereby, an anchor effect can be exhibited and the bonding strength between the partition wall and the adhesive layer can be further increased. Therefore, the mechanical strength of the display sheet is further improved.

In the display sheet of the present invention, it is preferable that the first wide portion is wider than the second wide portion.
Thereby, the fall of the aperture ratio of a display surface can be suppressed.
In the display sheet of the present invention, the portion embedded in the adhesive layer of the partition wall is located on the second substrate side, and the width gradually decreasing portion whose width gradually decreases toward the first substrate side, A width gradually increasing portion located on the first substrate side, the width of which gradually increases toward the first substrate side,
The first wide portion is positioned at the gradually increasing portion, the second wide portion is positioned at the gradually decreasing portion, and the narrow portion is positioned at a boundary between the gradually increasing portion and the gradually decreasing portion. It is preferable.
Thereby, the shape of an embedding part becomes simple.

In the display sheet of this invention, it is preferable that the said partition is comprised with the material which has thermoplasticity.
Thereby, the part currently embed | buried under the said contact bonding layer of a partition can be formed easily.

In the display sheet of the present invention, the adhesive layer is preferably made of a material having thermoplasticity.
Thereby, the part currently embed | buried under the said contact bonding layer of a partition can be formed easily.
In the display sheet of the present invention, the adhesive layer has a first adhesive layer and a second adhesive layer laminated in order from the first substrate side,
The first adhesive layer is made of a material having thermoplasticity,
The second adhesive layer is preferably made of a photocurable material.
Thereby, the penetration of the partition walls and the first adhesive layer into the dispersion can be prevented, and contamination of the dispersion can be prevented.

The display sheet manufacturing method of the present invention includes a first substrate provided on the display surface side, a second substrate disposed opposite to the first substrate, the first substrate, and the second substrate. A display layer provided between the substrate and a display sheet, comprising:
A dispersion liquid in which partition walls are formed on the second substrate, and at least one kind of first particles positively or negatively charged in each of a plurality of regions formed by the partition walls is dispersed in a dispersion medium. Forming the display layer by filling;
The first substrate having an adhesive layer formed on one surface is placed on the display layer so that the adhesive layer is located on the display layer side, and the first substrate and the second substrate A step of pressing at least one of the substrates against the other side to cause the tip of the partition wall to enter the adhesive layer and further to contact the first substrate to be deformed. To do.
Thereby, a display sheet having excellent mechanical strength can be easily obtained.

In the manufacturing method of the display sheet of this invention, it is preferable to make the front-end | tip part of the said partition penetrate | invade in the said adhesive layer in the state which softened the said adhesive layer.
Thereby, the front-end | tip part can be penetrated in an adhesive layer, preventing the unintentional deformation | transformation of a partition.
In the method for producing a display sheet of the present invention, the partition wall is made of a thermoplastic material,
It is preferable that the tip portion softened by heating is brought into contact with the first substrate to be deformed.
Thereby, a partition can be changed easily.

In the manufacturing method of the display sheet of this invention, it is preferable to soften the said partition, after making the front-end | tip part of the said partition penetrate | invade in the said contact bonding layer.
Thereby, the front-end | tip part can be penetrated in an adhesive layer, preventing the unintentional deformation | transformation of a partition.
In the method for producing a display sheet of the present invention, the adhesive layer is made of a material having thermoplasticity,
The softening temperature of the adhesive layer is preferably lower than the softening temperature of the partition wall.
As a result, it is possible to easily realize a state in which the adhesive layer is softened but the partition walls are not softened.
The display device of the present invention includes the display sheet of the present invention.
As a result, a display device having excellent reliability can be obtained.
An electronic apparatus according to the present invention includes the display device according to the present invention.
Thereby, an electronic device having excellent reliability can be obtained.

It is sectional drawing which shows 1st Embodiment of the display apparatus of this invention. It is a top view (top view) of the display apparatus shown in FIG. It is a partial expanded sectional view of the display apparatus shown in FIG. It is sectional drawing explaining the drive of the display apparatus shown in FIG. It is sectional drawing explaining the manufacturing method of the display apparatus shown in FIG. It is sectional drawing explaining the manufacturing method of the display apparatus shown in FIG. It is sectional drawing explaining the manufacturing method of the display apparatus shown in FIG. It is a partial expanded sectional view which shows 2nd Embodiment of the display apparatus of this invention. It is sectional drawing explaining the manufacturing method of the display apparatus shown in FIG. It is a schematic perspective view which shows 3rd Embodiment of the display apparatus of this invention. It is sectional drawing of the display sheet shown in FIG. It is a perspective view which shows embodiment at the time of applying the electronic device of this invention to electronic paper. It is a figure which shows embodiment at the time of applying the electronic device of this invention to a display.

Hereinafter, a display sheet, a display sheet manufacturing method, a display device, and an electronic apparatus of the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.
1. Display Device First, a display device incorporating the display sheet of the present invention will be described.
<First Embodiment>
1 is a cross-sectional view showing a first embodiment of the display device of the present invention, FIG. 2 is a plan view (top view) of the display device shown in FIG. 1, and FIG. 3 is a partially enlarged view of the display device shown in FIG. 4 is a cross-sectional view for explaining the driving of the display device shown in FIG. 1, and FIGS. 5, 6 and 7 are cross-sectional views for explaining a method for producing the display device shown in FIG. In the following description, for convenience of explanation, the upper side in FIG. 1 will be described as “upper” and the lower side as “lower”. Further, as shown in FIG. 1, two directions orthogonal to each other in a plan view of the display device are referred to as “X direction” and “Y direction”. The same applies to other figures.

A display device 20 (display device of the present invention) shown in FIG. 1 is an electrophoretic display device that displays a desired image using particle migration. The display device 20 includes a display sheet (front plane) 21 and a circuit board (back plane) 22.
As shown in FIG. 1, the display sheet 21 includes a substrate (first substrate) 12 including a flat base 2 and a second electrode 4 provided on the lower surface of the base 2, and a lower surface (electrode) of the substrate 12. 4 and the display layer 400 positioned between the adhesive layer 13 and the circuit board 22. In such a display sheet 21, the upper surface of the substrate 12 constitutes the display surface 121.

In addition, the display layer 400 includes partition walls 9 formed in a lattice shape and the dispersion liquid 100 filled in each cell S partitioned by the partition walls 9. The dispersion liquid 100 includes first particles (electrophoretic particles) A that are negatively charged and second particles (electrophoretic particles) B that are positively charged and have a hue different from that of the first particles A. 7 is dispersed.
On the other hand, the circuit board 22 is provided with a counter substrate (second substrate) 11 including a flat base 1 and a plurality of first electrodes 3 provided on the upper surface of the base 1, and the counter substrate 11. And a circuit (not shown). Such a circuit includes, for example, TFTs (switching elements) arranged in a matrix, gate lines and data lines formed corresponding to the TFTs, a gate driver that applies a desired voltage to the gate lines, and data A data driver that applies a desired voltage to the line, and a gate driver and a control unit that controls driving of the data driver are included.
In such a display device 20, the counter substrate 11 also serves as the second substrate of the display sheet 21.

Hereinafter, the structure of each part is demonstrated sequentially.
The base 1 and the base 2 are each composed of a sheet-like (flat plate) member, and have a function of supporting and protecting each member disposed therebetween. Each of the base portions 1 and 2 may be either flexible or hard, but is preferably flexible. By using the bases 1 and 2 having flexibility, it is possible to obtain a display device 20 having flexibility, that is, for example, a display device 20 useful in constructing electronic paper.

  In the case where the bases 1 and 2 are flexible, the constituent material includes highly transparent glass or resin. Examples of the resin include polyesters such as PET (polyethylene terephthalate) and PEN (polyethylene naphthalate), polyolefins such as polyethylene, modified polyolefins, polyamides, thermoplastic polyimides, polyethers, polyether ether ketones, polyurethanes, and chlorinated polyethylenes. These include various types of thermoplastic elastomers and the like, or copolymers, blends, polymer alloys and the like mainly containing these, and one or more of these can be used in combination.

  The average thicknesses of the bases 1 and 2 are appropriately set depending on the constituent material, application, etc., and are not particularly limited. However, when having flexibility, it is preferably about 20 μm or more and 500 μm or less, and 25 μm. As mentioned above, it is more preferable that it is about 250 micrometers or less. Thereby, size reduction (especially thickness reduction) of the display apparatus 20 can be achieved, aiming at harmony with the softness | flexibility and intensity | strength of the display apparatus 20. FIG.

  A film-like first electrode 3 and second electrode 4 are provided on the surfaces of the bases 1 and 2 on the display layer 400 side, that is, on the upper surface of the base 1 and the lower surface of the base 2, respectively. In the present embodiment, the second electrode 4 is a common electrode, and the first electrode 3 is an individual electrode (pixel electrode connected to a TFT) divided in a matrix in the X and Y directions. . In the display device 20, a region in which one first electrode 3 and the second electrode 4 overlap constitutes one pixel.

The constituent materials of the electrodes 3 and 4 are not particularly limited as long as they are substantially conductive, for example, metal materials such as gold, silver, copper, aluminum or alloys containing these, carbon black, In a carbon-based material such as graphene, carbon nanotube, and fullerene, an electroconductive polymer material such as polyacetylene, polyfluorene, polythiophene or a derivative thereof, or a matrix resin such as polyvinyl alcohol or polycarbonate, NaCl, Cu (CF ₃ SO ₃ ) Conductive oxide materials such as ion conductive polymer materials, indium oxide (IO), indium tin oxide (ITO), fluorine-doped tin oxide (FTO), zinc oxide, etc. in which ionic substances such as ₂ are dispersed Various conductive materials such as, and one or more of these It can be used in conjunction seen.

The average thicknesses of the electrodes 3 and 4 are appropriately set depending on the constituent material, application, etc., and are, for example, about 10 nm or more and 100 nm or less.
Here, among the bases 1 and 2 and the electrodes 3 and 4, the base and the electrode disposed on the display surface 121 side are each transparent, that is, substantially transparent (colorless and transparent, colored Transparent or translucent). In the present embodiment, since the upper surface of the substrate 12 constitutes the display surface 121, at least the base 2 and the second electrode 4 are substantially transparent. Thereby, the image displayed on the display device 20 can be easily recognized visually from the display surface 121 side.

A sealing portion 5 is provided between the substrate 12 and the counter substrate 11 along the edge portions thereof. The display layer 400 is hermetically sealed by the sealing portion 5. Thereby, it is possible to prevent moisture from entering the display device 20 and more reliably prevent display performance deterioration of the display device 20.
The constituent material of the sealing portion 5 is not particularly limited. For example, a thermoplastic resin such as an acrylic resin, a urethane resin, or an olefin resin, an epoxy resin, a melamine resin, or a heat such as a phenol resin. Various resin materials such as a curable resin can be used, and one or more of these can be used in combination.

An adhesive layer 13 is formed on the lower surface of the substrate 12. The adhesive layer 13 is substantially colorless and transparent like the base portion 2 and the second electrode 4.
Such an adhesive layer 13 is a layer used for bonding the partition wall 9 included in the display layer 400 and the substrate 12 as described later. The adhesive layer 13 also has a function of preventing contact between the electrode 4 and the dispersion medium 7, thereby preventing corrosion deterioration of the electrode 4. Further, it has a function of preventing the contact between the electrode 4 and the first and second particles A and B and preventing the first and second particles A and B from sticking to the electrode 4.

  The constituent material of the adhesive layer 13 is not particularly limited, but is preferably made of a material that is easily softened by heat, that is, a thermoplastic material. By using the thermoplastic material, the display device 20 can be easily manufactured as described later. The thermoplastic material is not particularly limited. For example, urethane resin, urea resin, ester resin, ether resin, olefin resin such as polyethylene or polypropylene, ethylene vinyl acetate copolymer (EVA) or ethylene methyl methacrylate copolymer. Examples thereof include thermoplastic polymers such as ethylene polymer such as coalescence (EMMA) and ethylene cyclic olefin copolymer (COC resin), acrylic resin, and butadiene elastomer.

  In order to increase the heat resistance of the adhesive layer 13, a thermosetting material such as an epoxy compound, an isocyanate compound, a cyanoacrylate, a silane coupling agent, a melamine compound, or a phenol compound is added to the thermoplastic resin as described above. You may do it. Moreover, you may mix a fibrous fine particle and a particulate nanoparticle with a thermoplastic resin. Thereby, micro unevenness | corrugation is formed in the lower surface (surface which faces the display layer 400) of the contact bonding layer 13, and a surface area can be enlarged compared with the case of a flat surface. For this reason, the retention of the first and second particles A and B is improved, the deposition thickness of the first and second particles A and B can be increased, and high-contrast display is possible.

  Here, as will be described later in the manufacturing method, in the manufacturing process of the display device 20, the front end portion of the partition wall 9 is pushed into the adhesive layer 13 by pushing the front end portion of the partition wall 9 into the adhesive layer 13. Exists. In order to perform such a process smoothly and reliably, it is necessary to suppress deformation of the partition wall 9 during this process. Therefore, it is preferable that the adhesive layer 13 is configured to be softer than the partition wall 9. That is, it is preferable that the adhesive layer 13 is made of a material lower than the Young's modulus of the constituent material of the partition wall 9. The Young's modulus of the constituent material of the adhesive layer 13 is not particularly limited, and may vary depending on the constituent material of the partition wall 9, but is preferably about 0.01 MPa or more and 500 MPa or less, for example.

  Further, in the manufacturing process of the display device 20, as described above, after the front end portion of the partition wall 9 has entered the adhesive layer 13, the partition wall 9 softened by heating is further pushed into the adhesive layer 13, There is a step of deforming the tip portion so as to be crushed in the adhesive layer 13 by pressing. In order to perform this process smoothly and reliably, it is preferable that the adhesive layer 13 is softened so that the deformation of the partition wall 9 in the adhesive layer 13 is facilitated. Therefore, the softening temperature (Vicat softening temperature) of the adhesive layer 13 is preferably lower than the softening temperature of the partition walls 9. The softening temperature (Vicat softening temperature) of the adhesive layer 13 is not particularly limited and is preferably about 50 ° C. or higher and 80 ° C. or lower, although it varies depending on the softening temperature of the partition wall 9. Thereby, for example, thermal damage to other members constituting the display device 20 can be reduced.

  The average thickness of the adhesive layer 13 is not particularly limited, but is preferably about 1 μm or more and 5 μm or less. Thereby, a sufficiently large contact area (bonding area) with the partition wall 9 can be secured, and these can be firmly bonded. In addition, the thickness of the adhesive layer 13 is sufficient to absorb the deformation of the adhesive layer 13 caused by the deformation of the partition wall 9 in the adhesive layer 13 as described above. Therefore, for example, it is possible to suppress the occurrence of bending or unevenness on the lower surface of the adhesive layer 13 and to prevent the image display characteristics from being deteriorated. Furthermore, since the adhesive layer 13 can be prevented from becoming excessively thick and the voltage drop between the electrodes 3 and 4 can be suppressed, it is possible to suppress a decrease in the retainability of the first and second particles A and B. it can.

A pixel electrode protective layer 14 is formed on the lower surface of the counter substrate 11. The pixel electrode protective layer 14 prevents contact between the electrode 3 and the dispersion medium 7, prevents corrosion deterioration of the electrode 3, and prevents contact between the electrode 3 and the first and second particles A and B. And the function of preventing the first and second particles A and B from sticking to the electrode 3.
The pixel electrode protective layer 14 is formed integrally with the partition wall 9. In order to reduce the electrical resistance of the pixel electrode protective layer 14, metal nanoparticles or the like may be blended in the pixel electrode protective layer 14. Thereby, the voltage drop between the electrodes 3 and 4 can be suppressed, and the fall of the retainability of the 1st, 2nd particle | grains A and B can be suppressed.

The thickness of the pixel electrode protective layer 14 is not particularly limited, but is preferably about 0.1 μm or more and 2 μm or less. Thereby, the function of the pixel electrode protective layer 14 can be exhibited, and the thickness thereof can be reduced. Therefore, the voltage drop between the electrodes 3 and 4 can be more effectively suppressed.
As shown in FIG. 1, the display layer 400 includes partition walls 9 formed in a lattice shape, and the dispersion liquid 100 filled in each cell S partitioned by the partition walls 9. Further, one first electrode 3 is disposed in each cell S. The number of the first electrodes 3 disposed in each cell S is not limited to one, and may be two or more.

The partition wall 9 is formed on the upper surface of the counter substrate 11. As shown in FIG. 2, the partition wall 9 includes a first partition wall 91 extending in the X direction and arranged in parallel in the Y direction perpendicular to the X direction in a plan view of the display layer 400. And second partition walls 92 extending in the direction and arranged at equal intervals in the X direction, and these intersect each other.
Such a partition wall 9 is substantially colorless and transparent. Hereinafter, the configuration (shape) of the partition wall 9 will be described in detail. However, the first and second partition walls 91 and 92 have the same configuration as each other. Explanation will be made and explanation of other partition walls will be omitted.

As shown in FIG. 3, the first partition wall 91 is formed so as to protrude from the counter substrate 11 toward the substrate 12, and its front end is embedded in the adhesive layer 13 and is in contact with the substrate 12. Yes.
The embedded portion 93, which is a portion embedded in the adhesive layer 13 of the first partition wall 91, is located in the middle of the height direction, and has a narrow width portion 931 having a narrower width and a front end side than the narrow width portion 931. The first wide portion 932, which is located on the (substrate 12 side) and wider than the narrow portion 931, is located on the base end side (opposite substrate 11 side) than the narrow portion 931, and from the narrow portion 931. And a second wide portion 933 having a large width. By setting it as such a shape, the surface area of the embedding part 93 increases and the contact area of the embedding part 93 and the contact bonding layer 13 increases in connection with it. Thereby, the embedding part 93 and the contact bonding layer 13 can be adhere | attached firmly. Further, by forming a “narrow” portion narrower than the upper and lower portions in the middle of the embedded portion 93 in the height direction, the anchor effect is exhibited, and the embedded portion 93 and the adhesive layer 13 are more firmly bonded. be able to.

Such an embedded portion 93 is bonded to the substrate 12 at the first wide portion 932. Thereby, the large contact area of the board | substrate 12 and the partition 9 can be ensured, and the partition 9 and the board | substrate 12 can be adhere | attached firmly.
More specifically, the embedded portion 93 is positioned on the counter substrate 11 side, the width gradually decreasing portion 93a whose width gradually decreases toward the substrate 12, and the substrate 12 side, and the width is on the substrate 12 side. The width gradually increasing portion 93b gradually increases toward the end, and the upper end of the width gradually decreasing portion 93a and the lower end of the width gradually increasing portion 93b are connected by a continuous surface. In such an embedded portion 93, the width gradually decreasing portion 93a constitutes the second wide width portion 933, the width gradually increasing portion 93b constitutes the first wide width portion 932, and the boundary between the width gradually decreasing portion 93a and the width gradually increasing portion 93b. The portion constitutes a narrow width portion 931. By making the embedding part 93 into such a shape, the above effects can be exhibited with a simple shape and with certainty.

  The width (maximum width) W2 of the first wide portion 932 is preferably larger than the width (maximum width) W3 of the second wide portion 933. Further, W3 is preferably 10 μm or less because it affects the aperture ratio of the display surface. Considering the strength of the partition wall 9, W3 is preferably 1 μm or more and 5 μm or less. And as a ratio of W2 / W3, 1.1-2.0 are preferable. If it is smaller than 1.1, it is difficult to obtain the anchor effect, and if it is 2.0 or more, the influence on the height of the partition wall becomes large, such being undesirable. Thereby, the contact area of the board | substrate 12 and the partition 9 becomes large, and the partition 9 and the board | substrate 12 can be adhere | attached more firmly. Even if the width W2 is larger than the width W3, the partition wall 9 is colorless and transparent, so that the aperture ratio of the display surface 121 (the ratio occupied by the effective display area) is not reduced, and the display characteristics are maintained. Can do.

  The base portion 94, which is a portion closer to the base end side than the embedded portion 93 of the first partition wall 91, has a tapered shape whose width gradually decreases toward the substrate 12 side. Therefore, the width of the tip end portion of the base portion 94 is narrower than that of the base end portion. Such a taper-shaped base 94 is formed continuously with the aforementioned width gradually decreasing portion 93 a of the embedded portion 93. By forming the base 94 in such a shape, the mechanical strength of the first partition 91 is improved and the aperture ratio of the display surface 121 is increased.

  The constituent material of the partition wall 9 is not particularly limited, but is preferably made of a material that is easily softened by heat, specifically, a thermoplastic material. By using the thermoplastic material, the step of deforming the tip portions of the first and second partition walls 91 and 92 in the adhesive layer 13 can be performed easily and reliably. Such a thermoplastic material is not particularly limited. For example, silicone resin, polyimide, epoxy resin, acrylic resin, urethane resin, urea resin, ester resin, ether resin, olefin resin such as polyethylene and polypropylene, ethylene acetate Examples thereof include ethylene polymers such as vinyl copolymer (EVA), ethylene methyl methacrylate copolymer (EMMA), and ethylene cyclic olefin copolymer (COC resin), and thermoplastic resins such as butadiene elastomer.

In order to increase the heat resistance and hardness of the partition wall 9, a thermosetting material such as an epoxy compound, an isocyanate compound, a cyanoacrylate, a silane coupling agent, a melamine compound, a phenol compound, etc. If necessary, an inorganic filler such as an ultraviolet polymerization initiator or silica nanoparticles may be added.
Such a partition wall 9 is preferably harder than the adhesive layer 13. That is, the partition wall 9 is preferably made of a material having a higher Young's modulus than the constituent material of the adhesive layer 13. For example, the Young's modulus of the constituent material of the partition walls 9 is preferably 500 MPa or more and 10 GPa or less, while the adhesive layer material is preferably 1 MPa or more and 500 MPa or less. Thereby, the front-end | tip part of the partition 9 can be easily penetrate | invaded (pierced) in the contact bonding layer 13 in the manufacturing process of the display apparatus 20. FIG.

  The softening temperature (Vicat softening temperature) of the partition walls 9 is preferably higher than the softening temperature of the adhesive layer 13. The softening temperature of the partition wall 9 is not particularly limited, and is preferably about 80 ° C. or higher and 120 ° C. or lower, although it varies depending on the softening temperature of the adhesive layer 13. Further, the softening temperature of the partition wall 9 is preferably about 30 ° C. higher than the softening temperature of the adhesive layer 13. Accordingly, since the adhesive layer 13 is surely softened when the partition wall 9 is softened, the partition wall 9 can be easily and reliably deformed as described above. Further, since a sufficient temperature difference is provided between the softening temperatures of the two, the partition wall 9 is not softened, but the adhesive layer 13 is easily softened.

Further, the softening temperature of the partition walls 9 is preferably lower than the boiling point of the dispersion medium 7, and more preferably 20 ° C. or more lower than the boiling point of the dispersion medium 7. Thereby, it is possible to effectively prevent the dispersion medium 7 from being evaporated by heat applied to soften the partition walls 9 during the manufacture of the display device 20.
Each region S formed by such partition walls 9 is filled with the dispersion liquid 100. The dispersion liquid 100 is obtained by dispersing negatively charged first particles A and positively charged second particles B having a hue different from that of the first particles A in a dispersion medium 7. The color (hue) of the first and second particles A and B is not particularly limited, and two colors are selected from achromatic colors such as white, black and gray, and chromatic colors such as red, blue and green. Any combination can be selected. For example, when realizing a monochrome display, one of the first and second particles A and B may be white and the other black.

  As the first and second particles A and B, any particles can be used as long as they have electric charges. For example, titanium oxide, zinc oxide, iron oxide, chromium oxide, zirconium oxide, etc. Oxide particles, nitride particles such as silicon nitride and titanium nitride, sulfide particles such as zinc sulfide, boride particles such as titanium boride, strontium chromate, cobalt aluminate, cuprous copper, ultra Inorganic pigment particles such as marine, organic pigment particles such as azo, quinacridone, anthraquinone, dioxazine, and perylene can be used. Alternatively, composite particles obtained by applying a pigment to the surface of resin particles made of acrylic resin, urethane resin, urea resin, epoxy resin, polystyrene, polyester, or the like can be used.

  The average particle diameter of the first and second particles A and B is not particularly limited, but is preferably about 100 nm or more and 1 μm or less. If the average particle size is less than 10 nm, sufficient chromaticity cannot be obtained, and the display contrast may be lowered and the display may become unclear. On the contrary, if the average particle diameter exceeds 1 μm, it is necessary to increase the coloring degree of the particles themselves more than necessary, and the amount of pigments used increases, and the first and second particles A and B are promptly used. Movement may be difficult, and the response speed may decrease.

In addition, the average particle diameter of the 1st, 2nd particle | grains A and B is the volume average particle | grains measured with the dynamic light scattering type particle size distribution measuring apparatus (For example, product name: LB-500, the Horiba, Ltd. make) Means diameter.
As the dispersion medium 7, one having a boiling point of 150 ° C. or higher and hardly vaporizing and having a relatively high insulating property is preferably used. Examples of the dispersion medium 7 include alcohols such as butanol and glycerin, cellosolves such as butyl cellosolve, esters such as butyl acetate, ketones such as dibutyl ketone, aliphatic hydrocarbons (liquid paraffin) such as pentane, Alicyclic hydrocarbons such as cyclohexane, aromatic hydrocarbons such as xylene, halogenated hydrocarbons such as methylene chloride, aromatic heterocycles such as pyridine, nitriles such as acetonitrile, N, N-dimethylformamide Such as amides, carboxylate, silicone oil or other various oils, and the like, and these can be used alone or as a mixture.

  Among these, as the dispersion medium 7, those mainly composed of aliphatic hydrocarbons (liquid paraffin) or silicone oil are preferable. The dispersion medium 7 containing liquid paraffin or silicone oil as a main component is preferable because it is hydrophobic and has a high aggregation suppressing effect on the first and second particles A and B. Thereby, it can prevent or suppress more reliably that the display performance of the display apparatus 20 deteriorates with time. In addition, liquid paraffin and silicone oil are preferable from the viewpoints of excellent weather resistance and high safety because they do not have an unsaturated bond.

The configuration of the display device 20 has been described in detail above. According to such a display device 20, since the substrate 12 and the partition wall 9 can be firmly bonded, the mechanical strength (particularly the strength against bending deformation) can be increased. In addition, since the substrate 12 and the partition wall 9 are firmly bonded, each cell S can be reliably separated from the other cells S, and the first and second particles A and B move between the adjacent cells S. (Going back and forth) can be prevented. Therefore, the bias of the first and second particles A and B in the display layer 400 is prevented, and excellent display characteristics can be exhibited and maintained.
Such a display device 20 is driven as follows, for example.

-Color display state of the first particle-
When a voltage is applied between the first electrode 3 and the second electrode 4 so that the first electrode 3 has a negative potential and the second electrode 4 has a positive potential, the electric field generated by the voltage application is displayed on the display layer. It acts on the first and second particles A and B in 400. Then, the negatively charged first particles A migrate to the second electrode 4 side and gather at the second electrode 4, and the positively charged second particles B migrate to the first electrode 3 side. To the first electrode 3. As a result, the color of the first particles A is displayed on the display surface 121 as shown in FIG.

-Color display state of second particles-
When a voltage is applied between the first electrode 3 and the second electrode 4 so that the first electrode 3 has a positive potential and the second electrode 4 has a negative potential, the electric field generated by the voltage application is displayed on the display layer. It acts on the first and second particles A and B in 400. Then, the negatively charged first particles A migrate to the first electrode 3 side and gather on the first electrode 3, and the positively charged second particles B migrate to the second electrode 4 side. To the second electrode 4. Thereby, as shown in FIG.4 (b), the color of the 2nd particle | grains B is displayed on the display surface 121. FIG.
By performing such display color selection for each region S (pixel), a desired image can be displayed on the display surface 121.

Next, a method for manufacturing the display device 20 will be described.
The manufacturing method of the display device 20 includes forming the display layer 400 by forming the partition wall 9 on the counter substrate 11 and filling the dispersion liquid 100 in each of the plurality of regions S formed by the partition wall 9. The substrate 12 on which the adhesive layer 13 is formed is placed on the display layer 400 so that the adhesive layer 13 is located on the display layer 400 side, and at least one of the substrate 12 and the counter substrate 11 is pressed to the other side, And a step of causing the tip end of the partition wall 9 to enter the adhesive layer 13 and then contacting the substrate 12 to be deformed. Hereinafter, each step will be described in detail.

[1]
First, as shown in FIG. 5A, the counter substrate 11 is prepared, and the partition wall 9 and the pixel electrode protective layer 14 are simultaneously formed (integrally formed) on the counter substrate 11.
The method for forming the partition wall 9 and the pixel electrode protective layer 14 is not particularly limited, and includes a patterning method using a photolithography technique and an etching technique, a printing method such as screen printing, and an imprint method in which irregularities are formed with a mold. As a representative example, the case of using the imprint method will be described. First, as shown in FIG.5 (b), the coating liquid obtained by disperse | distributing the raw material (resin material) in the solvent on the counter substrate 11 is apply | coated, and it is made to dry and the resin layer 90 is removed by removing. Form. Thereafter, as shown in FIG. 5C, a heated mold 900 is pressed against the resin layer 90 to transfer and form a partition wall shape on the counter substrate 11. Thereafter, the resin layer 90 is solidified by, for example, irradiating ultraviolet rays, although it varies depending on the raw material. Thereby, as shown in FIG. 6A, the partition wall 9 and the pixel electrode protective layer 14 are integrally formed.

In this state, each of the first and second partition walls 91 and 92 constituting the partition wall 9 has a tapered shape in which the width gradually decreases toward the distal end side. That is, at this time, the width gradually increasing portion 93b as in the finished product is not yet formed.
Here, in order to pierce the tips of the first and second partition walls 91 and 92 into the adhesive layer 13 in a later step, the tips of the first and second partition walls 91 and 92 are reduced in order to reduce the resistance at that time. The part is preferably sharper. Further, in order to increase the aperture ratio of the display surface 121, it is preferable that the tip portion has a narrower width. Therefore, the width of the tip of the first and second partition walls 91 and 92 is preferably 5 μm or less.

Further, the first and second partition walls 91 and 92 are prevented from being unintentionally deformed or overturned by stress applied when the first and second partition walls 91 and 92 are pushed into the adhesive layer 13. It is preferable to increase the width of the base end portions of the partition walls 91 and 92 to ensure sufficient mechanical strength. The width of the base ends of the first and second partition walls 91 and 92 is not particularly limited, but is preferably twice or more the width of the tip, for example, 10 μm or more and 20 μm or less.
The height of the first and second partition walls 91 and 92 is not particularly limited, but is preferably 5 μm or more and 50 μm or less. Thereby, the shielding property of the 1st, 2nd particle | grains A and B can be ensured, shortening the moving distance of the 1st, 2nd particle | grains A and B. FIG. Therefore, high contrast display is possible while exhibiting high response speed.

[2]
Next, as shown in FIG. 6B, each region S is filled with the dispersion liquid 100. The filling method of the dispersion liquid 100 is not particularly limited, but for example, an inkjet method can be used.
[3]
Next, the substrate 12 on which the adhesive layer 13 is formed is prepared. The method for forming the adhesive layer 13 is not particularly limited, and a resin layer is formed by applying a coating liquid obtained by dispersing a raw material (resin material) in a solvent onto the substrate 12 (the surface of the second electrode 4). The resin layer can be dried to remove the solvent. As a coating method of the coating solution, for example, gravure coating, comma coating, wire bar coating, lip coating, die coating, screen printing, and inkjet method can be used.

[4]
Next, as illustrated in FIG. 6C, the substrate 12 is placed on the display layer 400 so that the adhesive layer 13 is positioned on the display layer 400 side. Thereafter, the adhesive layer 13 is heated to about 50 to 80 ° C. (above the softening temperature of the adhesive layer 13) to be softened, and the substrate 12 and the counter substrate 11 are pressed toward each other in the softened state. As a result, as shown in FIG. 7A, the tip of the partition wall 9 breaks through the surface of the adhesive layer 13 and enters the adhesive layer 13, and further reaches and contacts the lower surface of the substrate 12. In this step, since the heating temperature is higher than the softening temperature of the adhesive layer 13 and lower than the softening temperature of the partition wall 9, only the adhesive layer 13 can be softened without softening the partition wall 9. Therefore, a large difference can be generated in the hardness between the partition wall 9 and the adhesive layer 13, and this process can be performed smoothly and reliably while preventing unintentional deformation of the partition wall 9.
Further, when the tip of the partition wall 9 enters the adhesive layer 13, the dispersion liquid 100 adhering to the surface of the partition wall 9 is removed by contact with the adhesive layer 13, so that the partition wall 9 and the adhesive layer 13 are included in the adhesive layer 13. The dispersion liquid 100 does not substantially intervene at the interface with each other, so that they can be bonded more firmly.

[5]
Next, the counter substrate 11 is heated to about 80 to 120 ° C. (above the softening temperature of the partition wall), and the tip of the partition wall 9 is locally softened by the heat. Then, in this state, the substrate 12 and the counter substrate 11 are further pressed in a direction approaching each other. As a result, as shown in FIG. 7B, the tip end portion of the partition wall 9 is deformed so as to be crushed and expanded by the substrate 12, and the embedded portion 93 (first wide portion 932, A narrow portion 931 and a second wide portion 933) are formed. The deformed portion becomes the first wide portion 932. Thereafter, for example, the partition wall 9 and the adhesive layer 13 are cured again by natural cooling. Thereby, the partition wall 9 and the adhesive layer 13 are firmly bonded.
By heating the counter substrate 11 and locally softening only the tip of the partition wall 9, the base portion 94 of the partition wall 9 can be kept hard, and the unintentional deformation of the base portion 94 can be effectively prevented. Can do. Moreover, since a material having a boiling point higher than the heating temperature is used as the dispersion medium 7, evaporation of the dispersion medium 7 in this step can be effectively prevented. For example, generation of bubbles and the like are more effective. Can be prevented.

[6]
Next, as illustrated in FIG. 7C, the display device 20 is obtained by forming the sealing portion 5 around the display layer 400. According to such a manufacturing method, the partition wall 9 and the substrate 12 are firmly bonded, and the display device 20 having excellent mechanical strength can be manufactured.

Second Embodiment
Next, a second embodiment of the display device of the present invention will be described.
FIG. 8 is a partial enlarged cross-sectional view showing a second embodiment of the display device of the present invention, and FIG. 9 is a cross-sectional view for explaining a method of manufacturing the display device shown in FIG.
Hereinafter, the second embodiment will be described with a focus on differences from the above-described embodiment, and description of similar matters will be omitted.

The display device according to the second embodiment of the present invention is the same as the display device of the first embodiment except that the configuration of the adhesive layer is different. In addition, the same code | symbol is attached | subjected to the structure similar to 1st Embodiment mentioned above.
As shown in FIG. 8, the adhesive layer 13A of the display device 20 of the present embodiment includes a first adhesive layer 131A formed on the lower surface of the substrate 12 and a second adhesive layer formed on the lower surface of the first adhesive layer 131A. And an adhesive layer 132A. That is, the adhesive layer 13A includes a first adhesive layer 131A and a second adhesive layer 132A that are sequentially stacked from the substrate 12 side.

Among these, the first adhesive layer 131 </ b> A is made of a thermoplastic material, like the adhesive layer 13 of the first embodiment described above. The configuration of the first adhesive layer 131A is the same as that of the adhesive layer 13 of the first embodiment, and a description thereof will be omitted.
On the other hand, the second adhesive layer 132A is harder than the first adhesive layer 131A. The second adhesive layer 132A is a layer that functions as a barrier layer that prevents the softened partition wall 9 and the first adhesive layer 131A from penetrating into the dispersion liquid (does not flow out) when the display device 20 is manufactured. is there. As a result, contamination of the dispersion 100 can be prevented, and deterioration of display characteristics can be effectively prevented.

  More specifically, as shown in FIG. 9A, the substrate 11 on which the partition walls 9 and the display layer 400 are formed and the adhesive layer 13A are formed in the same manner as in the manufacturing method of the first embodiment described above. The substrate 12 is overlapped. In this state, the second adhesive layer 132A has already been cured by ultraviolet irradiation. Next, the adhesive layer 13A is heated to soften the first adhesive layer 131A. The second adhesive layer 132A maintains a hard state because it is not softened by heat. Therefore, the penetration of the first adhesive layer 131A into the dispersion liquid 100 is prevented. Next, the substrate 12 and the counter substrate 11 are pressed toward each other. As a result, as shown in FIG. 9B, the tip of the partition wall 9 penetrates the surface of the adhesive layer 13 (second adhesive layer 132A) and enters the adhesive layer 13, and further on the lower surface of the substrate 12. Reach and touch. Next, the counter substrate 11 is heated to a temperature equal to or higher than the softening temperature of the partition wall 9, and the substrate 12 and the counter substrate 11 are further pressed toward each other in a state where the tip end portion of the partition wall 9 is locally softened. As a result, as shown in FIG. 9C, the distal end portion of the partition wall 9 is crushed and expanded by the substrate 12, and an embedded portion 93 is formed in the adhesive layer 13. At this time, penetration of the softened partition wall 9 into the dispersion liquid 100 is prevented by the second adhesive layer 132A. In this way, contamination of the dispersion 100 is prevented.

  The Young's modulus of the constituent material of the second adhesive layer 132A is preferably higher than the Young's modulus of the constituent material of the first adhesive layer 131A and lower than the Young's modulus of the constituent material of the partition wall 9. Specifically, as the Young's modulus of the constituent material of the second adhesive layer 132A, for example, the Young's modulus of the constituent material of the first adhesive layer 131A is 0.01 MPa or more and 50 MPa or less, and the Young's modulus of the constituent material of the partition wall 9 is, for example. When the rate is 500 MPa or more and 10 GPa or less, it is preferably higher than 50 MPa and lower than 500 MPa.

  The second adhesive layer 132A is preferably made of a photocurable material such as an ultraviolet curable material. As a result, the second adhesive layer 132A becomes a layer that is not softened by heat, and the hardened state is maintained even when the adhesive layer 131A and the partition wall 9 are softened by heat. The penetration of the partition wall 9 and the first adhesive layer 131A into the dispersion liquid 100 can be reliably prevented. In addition, since the use of a photo-curing material eliminates the need for heat for curing, there is a problem that the first adhesive layer 131A is softened when the second adhesive layer 132A is cured. Is prevented. Therefore, the adhesive layer 13A can be reliably and easily formed.

The photocurable (ultraviolet curable) material constituting the second adhesive layer 132A is not particularly limited, but an ultraviolet polymerization initiator is blended in the resin material exemplified as the constituent material of the first adhesive layer 131A. Materials can be used.
Also according to the second embodiment, the same effects as those of the first embodiment described above can be exhibited.

<Third Embodiment>
FIG. 10 is a schematic perspective view showing a third embodiment of the display device of the present invention, and FIG. 11 is a cross-sectional view of the display sheet shown in FIG.
Hereinafter, the third embodiment will be described with a focus on differences from the above-described embodiment, and description of similar matters will be omitted.

The display device according to the third embodiment is the same as that of the first embodiment except that the display sheet is configured as a separate body.
As shown in FIG. 10, the display device 20C of the present embodiment includes a display sheet 21C and a writing device 22C.
As shown in FIG. 11, the display sheet 21C includes a substrate (first substrate) 12C, a substrate (second substrate) 11C disposed opposite to the substrate 12C, and an adhesive layer 13 formed on the lower surface of the substrate 12C. And a display layer 400 provided between the substrates 12C and 11C, and a sealing portion 5 for sealing the display layer 400. Since the substrates 12C and 11C have the same configuration as the base 2 of the substrate 12 of the first embodiment described above, description thereof is omitted.

The writing device 22C is a device used when writing a desired image (pattern, color, character, picture, or a combination thereof) on the display sheet 21C. As shown in FIG. 10, the writing device 22C is common to a pedestal 221C, a sheet-like common electrode 222C provided on the pedestal 221C, and a writing pen (input tool) 224C provided with a partial electrode 223C at the tip. Voltage application means 225C for applying a voltage between the electrode 222C and the partial electrode 223C.
Such a display device 20C is used as follows, for example.

  First, the display sheet 21C in which the entire display surface 121 is in a white display state is placed on the common electrode 222C of the writing device 22C with the display surface 121 facing upward. Next, a voltage at which the partial electrode 223C side has a low potential is applied between the common electrode 222C and the partial electrode 223C by the voltage applying unit 225C. In this state, when the writing pen 224C is moved along a desired locus while being in contact with the display surface 121, migration of the first and second particles A and B occurs in an area corresponding to the locus, and the display color is white. To black.

According to such a display device 20C, a desired character or the like can be drawn on the display surface 121 of the display sheet 21C with the same feeling as drawing a character or the like on paper with a pencil. Therefore, the operability (operation feeling) of the display device 20C is improved.
Also according to the third embodiment, the same effects as those of the first embodiment described above can be exhibited.

  Each of the display devices 20 described above can be incorporated into various electronic devices. As an electronic apparatus of the present invention provided with an electrophoretic display device, for example, an electronic paper, an electronic book, a television, a viewfinder type, a monitor direct view type video tape recorder, a car navigation device, a pager, an electronic notebook, a calculator, an electronic newspaper, Examples include a word processor, a personal computer, a workstation, a videophone, a POS terminal, and a device equipped with a touch panel.

Of these electronic devices, an electronic paper will be described as an example for specific description.
FIG. 12 is a perspective view showing an embodiment when the electronic apparatus of the present invention is applied to electronic paper.
An electronic paper 600 shown in FIG. 12 includes a main body 601 composed of a rewritable sheet having the same texture and flexibility as paper, and a display unit 602. In such electronic paper 600, the display unit 602 includes the display device 20 as described above.

Next, an embodiment when the electronic apparatus of the present invention is applied to a display will be described.
FIG. 13 is a diagram showing an embodiment when the electronic apparatus of the present invention is applied to a display. Among these, (a) in FIG. 13 is a sectional view and (b) is a plan view.
A display (display device) 800 illustrated in FIG. 13 includes a main body 801 and an electronic paper 600 that is detachably attached to the main body 801. The electronic paper 600 has the same configuration as described above, that is, the configuration shown in FIG.

  The main body 801 has an insertion port 805 into which the electronic paper 600 can be inserted on its side (right side in FIG. 13A), and two pairs of conveying rollers 802a and 802b are provided inside. Yes. When the electronic paper 600 is inserted into the main body 801 through the insertion port 805, the electronic paper 600 is installed in the main body 801 in a state of being sandwiched between the pair of conveyance rollers 802a and 802b.

  A rectangular hole 803 is formed on the display surface side of the main body 801 (the front side in FIG. 13B), and a transparent glass plate 804 is fitted in the hole 803. . Thereby, the electronic paper 600 installed in the main body 801 can be viewed from the outside of the main body 801. That is, in the display 800, the display surface is configured by visually recognizing the electronic paper 600 installed in the main body 801 on the transparent glass plate 804.

In addition, a terminal portion 806 is provided at the leading end of the electronic paper 600 in the insertion direction (left side in FIG. 13A), and the electronic paper 600 is installed in the main body 801 inside the main body 801. A socket 807 to which the terminal portion 806 is connected in the state is provided. A controller 808 and an operation unit 809 are electrically connected to the socket 807.
In such a display 800, the electronic paper 600 is detachably installed on the main body 801, and can be carried and used while being detached from the main body 801. This improves convenience.

  As described above, the display sheet, the display sheet manufacturing method, the display device, and the electronic apparatus according to the present invention have been described based on the illustrated embodiment.However, the present invention is not limited to this, and the configuration of each part is as follows. Any structure having a similar function can be substituted. In addition, any other component may be added to the present invention. Moreover, you may combine each embodiment mentioned above suitably.

  In the above-described embodiment, the partition walls 9 have a lattice shape. However, the configuration (planar shape) of the partition walls 9 is not particularly limited. For example, it may be configured in a honeycomb shape, or may be configured by a plurality of partition walls extending in the X direction and arranged at intervals in the Y direction. In the former case, the mechanical strength is further increased, and in the latter case, the aperture ratio can be further increased.

Moreover, you may comprise a partition with a porous body. In this case, the pores formed in the partition walls are allowed to allow the dispersion medium 7 to pass through, but are not large enough to allow the passage of the first and second particles A and B. The Thereby, since the dispersion medium 7 can be moved between the adjacent cells S, the pressure applied to the predetermined cells S can be dispersed and absorbed. Specifically, for example, when the predetermined cell S is pressed by the writing pen 224C as in the above-described third embodiment, the dispersion medium 7 moves from the cell S to the adjacent cell S, so that the cell S An increase in the internal pressure can be suppressed. In addition, as a porosity of a partition, it is preferable that it is about 5% or more and about 50%, for example. Moreover, as a magnitude | size of a void | hole, it is preferable that it is 1 nm or more and 100 nm or less, for example.
In the above-described embodiment, the configuration in which the width of the first wide portion is wider than the width of the second wide portion has been described. However, the present invention is not limited to this, and the width of the first wide portion is the second wide width. It may be narrower than the width of the part. When the partition wall is not transparent and has substantially no light transmittance, such a configuration can prevent a decrease in the aperture ratio of the display surface.

  DESCRIPTION OF SYMBOLS 1,2 ... Base part 100 ... Dispersion liquid 11C, 12C ... Substrate 11 ... Counter substrate 12 ... Substrate 121 ... Display surface 13, 13A ... Adhesive layer 131A ... First adhesive layer 132A ... Second adhesive layer 14 ... Pixel electrode Protective layer 20 ... Display device 20C ... Display device 21 ... Display sheet 21C ... Display sheet 22 ... Circuit board 22C ... Writing device 221C ... Base 222C ... Common electrode 223C ... Partial electrode 224C ... Writing pen 225C ... ...... Voltage application means 3, 4 ... electrode 400 ... display layer 5 ... sealing part 7 ... dispersion medium 600 ... electronic paper 601 ... main body 602 ... display unit 800 ... display 801 ... main body part 802a, 802b ... Transport roller pair 803 ... Hole 804 ... Transparent glass plate 805 ... Insertion slot 806 ... Terminal 807..Socket 808..Controller 809..Operation part 9 ... Partition 90 ... Resin layer 900 ... Mold 91 ... First partition 92 ... Second partition 93 ... Built-in part 931 ... Narrow part 932 ... First Wide part 933 ... 2nd wide part 93a ... Width gradually decreasing part 93b ... Width gradually increasing part 94 ... Base part A ... 1st particle B ... 2nd particle S ... Cell (region) W2, W3 ... Width

Claims (15)

A first substrate provided on the display surface side;
A second substrate disposed opposite the first substrate;
An adhesive layer provided on the second substrate side of the first substrate;
A display layer provided between the adhesive layer and the second substrate,
The display layer includes a partition that divides the display layer into a plurality of regions, and a dispersion liquid in which at least one kind of positively or negatively charged particles filled in each region is dispersed in a dispersion medium. Have
An end of the partition on the first substrate side is embedded in the adhesive layer and is in contact with the first substrate, and a portion embedded in the adhesive layer is narrow. A display sheet comprising: a width portion; and a first wide portion that is positioned closer to the first substrate than the narrow portion and wider than the narrow portion.   The display sheet according to claim 1, wherein the first wide portion is in contact with the first substrate.   The portion embedded in the adhesive layer of the partition wall has a second wide portion that is located closer to the second substrate than the narrow portion and wider than the narrow portion. The display sheet according to 1 or 2.   The display sheet according to claim 3, wherein the first wide portion is wider than the second wide portion. A portion embedded in the adhesive layer of the partition wall is located on the second substrate side, and a width gradually decreasing portion whose width gradually decreases toward the first substrate side, and a portion positioned on the first substrate side. A width gradually increasing portion whose width gradually increases toward the first substrate side,
The first wide portion is positioned at the gradually increasing portion, the second wide portion is positioned at the gradually decreasing portion, and the narrow portion is positioned at a boundary between the gradually increasing portion and the gradually decreasing portion. The display sheet according to any one of claims 1 to 4. The septum display sheet according to any one of claims 1 to 5 is composed of a material having a thermoplastic. The adhesive layer, the display sheet according to any one of claims 1 is composed of a material having a thermoplastic 6. The adhesive layer has a first adhesive layer and a second adhesive layer laminated in order from the first substrate side,
The first adhesive layer is made of a material having thermoplasticity,
The second adhesive layer, the display sheet according to any one of claims 1 and is composed of a material having a photocurable 6. A first substrate provided on the display surface side, a second substrate disposed opposite to the first substrate, and a display provided between the first substrate and the second substrate A display sheet having a layer,
A dispersion liquid in which partition walls are formed on the second substrate, and at least one kind of first particles positively or negatively charged in each of a plurality of regions formed by the partition walls is dispersed in a dispersion medium. Forming the display layer by filling;
The first substrate having an adhesive layer formed on one surface is placed on the display layer so that the adhesive layer is located on the display layer side, and the first substrate and the second substrate A step of pressing at least one of the substrates against the other side to cause the tip of the partition wall to enter the adhesive layer and further to contact the first substrate to be deformed. Display sheet manufacturing method. The method for manufacturing a display sheet according to claim 9 , wherein a leading end portion of the partition wall enters the adhesive layer in a state where the adhesive layer is softened. The partition is made of a thermoplastic material,
The method for manufacturing a display sheet according to claim 9 or 10 , wherein the tip portion softened by heating is brought into contact with the first substrate to be deformed. The method for manufacturing a display sheet according to claim 11 , wherein the softening of the partition wall is performed after a front end portion of the partition wall has entered the adhesive layer. The adhesive layer is made of a material having thermoplasticity,
Softening temperature of the adhesive layer, the display sheet manufacturing method according to any one of claims 10 lower than the softening temperature of the partition wall 12. Display device characterized by comprising a display sheet according to any one of claims 1 to 8. An electronic apparatus comprising the display device according to claim 14 .

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