JP5406734B2 - Display sheet, display device and electronic device - Google Patents

Description

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

For example, an electrophoretic display device using particle electrophoresis is known as a display device such as electronic paper. The electrophoretic display device is provided with a display layer formed by holding a plurality of microcapsules in which a dispersion liquid in which electrophoretic particles are dispersed is sealed with a binder between a pair of sheet members on which electrodes are formed. Composed.
Such an electrophoretic display device can be manufactured, for example, as follows. First, a display layer is formed by applying and drying a coating liquid containing a plurality of microcapsules and a binder on the surface of the first sheet member on which an electrode layer such as an ITO thin film is formed. Overlay the release sheet on the surface. Along with this, a second sheet member (back plane) on which a drive circuit (for example, a plurality of electrodes and TFTs formed corresponding to these electrodes) is formed is prepared. Next, the release sheet is peeled off from the surface of the display layer, and the second sheet member is bonded (bonded) to the surface of the display layer using the adhesive force of the display layer, whereby the electrophoretic display device is manufactured. (For example, refer to Patent Document 1). According to such a manufacturing method, until the second sheet member is adhered on the display layer, the surface of the display layer is dried by the release sheet, and dust, dust, and the like adhere to the surface of the display layer. Since it can prevent, the adhesive force (adhesive force) of the surface of a display layer can be maintained.

  Here, a normal release sheet has a base material and a release layer (for example, a fluorine-based release layer, a silicone release layer, etc.) formed on one surface of the base material. The surface of is used in contact with the surface of the display layer. The surface of the release layer is a flat surface. In such a release sheet, since the release sheet contacts the entire surface of the display layer, it is difficult to release the release sheet from the display layer, and when the release sheet is released from the display layer, the release layer is formed on the surface of the display layer. There is a problem in that a part of the remaining part is left as a remaining part (becomes adhered), and the remaining part reduces the adhesive strength with the backplane.

Special table 2007-509379 gazette

  An object of the present invention is to use a display sheet that easily peels the release sheet from the display layer, and does not leave a part of the release sheet on the display layer even when the release sheet is peeled off from the display layer. An object is to provide a display device and an electronic device with high reliability.

Such an object is achieved by the present invention described below.
The display sheet of the present invention comprises a base material,
A display layer that is provided on the surface of the base material and has a plurality of storage portions that movably store particles, and the surface has an adhesive force or an adhesive force;
None of the sheet, a rough surface at least one surface is formed a minute uneven, as crude surface contacts the surface of the display layer, and a release sheet are superimposed on the display layer, the Have
Each of the plurality of accommodating portions is a microcapsule having a spherical shape,
The unevenness has a plurality of ridges extending in a predetermined direction and adjacent to each other,
The width of the ridge is smaller than the average particle size of the microcapsule,
A distance between the pair of adjacent convex protrusions is smaller than an average particle diameter of the microcapsules .
Thereby, since the adhesion area (contact area) between the display layer and the release sheet can be reduced, the release sheet can be easily peeled off from the display layer, and the release sheet is peeled off from the display layer even if the release sheet is peeled off from the display layer. It is possible to provide a display sheet in which a part of the display sheet does not remain.

In the display sheet of this invention, it is preferable that the extending direction of each said protruding item | line is parallel to the peeling direction of the said peeling sheet in planar view of the said peeling sheet.
Thereby, a protruding item | line will give a firmness to a peeling sheet, and the breakage | damage (destruction) of a peeling sheet can be prevented. In addition, since the contact area between the rough surface and the surface of the display layer becomes substantially equal over the entire peeling direction, the release sheet can be peeled off from the surface of the display layer more smoothly.

In the display sheet of this invention, it is preferable that the extending direction of each said protruding item is orthogonal to the peeling direction of the said peeling sheet in planar view of the said peeling sheet.
Thereby, since a peeling sheet can be easily bent between a pair of adjacent ridges (a part where the sheet thickness is thinner than other parts), the peeling sheet is more smoothly peeled from the surface of the display layer. be able to. In addition, since protrusions (that is, regions in contact with the surface of the display surface) are intermittently present in the peeling direction, the peeling sheet is peeled off from the surface of the display layer with a relatively small force. Can do.

  The display sheet of the present invention comprises a base material,
  A display layer that is provided on the surface of the base material and has a plurality of storage portions that movably store particles, and the surface has an adhesive force or an adhesive force;
  A release sheet that is in the form of a sheet and has a rough surface on which at least one surface is formed with minute irregularities, and is laminated on the display layer so that the rough surface is in contact with the surface of the display layer. Have
  Each of the plurality of accommodating portions is a microcapsule having a spherical shape,
  The concave and convex portions extend in a first direction and are separated from each other by a plurality of first ridges, and extend in a direction different from the first direction. And a second ridge that intersects the ridge of
  The width of the first ridge and the width of the second ridge are each smaller than the average particle diameter of the microcapsules,
  A pair of adjacent first convex spacing distances and a pair of adjacent second convex spacing distances are each smaller than the average particle size of the microcapsules.
  Thereby, since the adhesion area (contact area) between the display layer and the release sheet can be reduced, the release sheet can be easily peeled off from the display layer, and the release sheet is peeled off from the display layer even if the release sheet is peeled off from the display layer. It is possible to provide a display sheet in which a part of the display sheet does not remain.

In the display sheet of the present invention, the display layer has an adhesive layer,
It is preferable that the rough surface of the release sheet is in contact with the surface of the adhesive layer.
Thereby, the adhesive force of the surface of a display layer can be improved.

In the display sheet of the present invention, each of the plurality of accommodating portions is a microcapsule having a spherical shape,
It is preferable that irregularities along the outer shape of the microcapsules are formed on the surface of the display layer.
Thereby, the contact area of a peeling sheet and a display layer can be decreased compared with the case where the surface of a display layer is a flat surface. Therefore, peeling of the release sheet from the surface of the display layer can be performed more smoothly.

In the display sheet of this invention, it is preferable that the said peeling sheet has electroconductivity.
Thereby, a peeling sheet can be utilized as an electrode for a test | inspection at the time of test | inspecting the display characteristic of a display sheet.
The display device of the present invention is manufactured using the display sheet of the present invention.
Thereby, a highly reliable display device is obtained.
An electronic apparatus according to the present invention includes the display device according to the present invention.
As a result, a highly reliable electronic device can be obtained.

It is sectional drawing which shows 1st Embodiment of the display apparatus of this invention. It is sectional drawing explaining the action | operation of the display apparatus shown in FIG. It is sectional drawing of the display sheet used for manufacture of the display apparatus shown in FIG. It is a cross-sectional perspective view of the peeling sheet with which the display sheet shown in FIG. 3 is provided. It is a cross-sectional perspective view of the peeling sheet which the display sheet used for manufacture of the display apparatus concerning 2nd Embodiment of this invention has. It is sectional drawing of the display sheet used for manufacture of the display apparatus concerning 3rd Embodiment of this invention. It is sectional drawing of the display apparatus manufactured with the display sheet shown in FIG. It is sectional drawing of the display sheet used for manufacture of the display apparatus concerning 4th Embodiment of this invention. It is sectional drawing of the display apparatus manufactured with the display sheet shown in FIG. It is sectional drawing of the display sheet used for manufacture of the display apparatus concerning 5th Embodiment of this invention. It is sectional drawing of the display apparatus manufactured with the display sheet shown in FIG. It is sectional drawing of the display sheet used for manufacture of the display apparatus concerning 6th Embodiment of this invention. It is sectional drawing of the display apparatus manufactured with the display sheet shown in FIG. It is sectional drawing of the display sheet used for manufacture of the display apparatus concerning 7th Embodiment of this invention. It is sectional drawing of the display apparatus manufactured with the display sheet shown in FIG. It is sectional drawing of the peeling sheet which the display sheet used for manufacture of the display apparatus concerning 8th Embodiment of this invention has. 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 device, and an electronic device will be described in detail based on preferred embodiments shown in the accompanying drawings.
<First Embodiment>
First, a first embodiment of a display device (display device of the present invention) manufactured using the display sheet of the present invention will be described.

  1 is a cross-sectional view showing a first embodiment of the display device of the present invention, FIG. 2 is a cross-sectional view for explaining the operation of the display device shown in FIG. 1, and FIG. 3 is for manufacturing the display device shown in FIG. 4 is a cross-sectional perspective view of a release sheet provided in the display sheet shown in FIG. In the following description, for convenience of explanation, the upper side in FIGS. 1 to 4 will be described as “upper” and the lower side will be described as “lower”.

  A display device 1 shown in FIG. 1 includes a display substrate (front plane) 2 and a circuit substrate (back plane) 9. The display substrate 2 includes a substrate (base material) 3 including a flat base 31 and a common electrode (second electrode) 32 provided on the lower surface of the base 31, a microcapsule 41, and a substrate 3. The display layer 4 having the binder 42 and the sealing portion 5 that hermetically seals the gap between the substrate 3 and the circuit substrate 9. On the other hand, the circuit board 9 is provided on a counter substrate 93 including a flat base 91 and a plurality of individual electrodes (first electrodes) 92 provided on the upper surface of the base 91, and the counter substrate 93 (base 91). For example, a circuit (not shown) including a switching element such as a TFT.

  Each of the base 31 and the base 91 is configured by a sheet-like (flat plate) member, and has a function of supporting and protecting each member disposed therebetween. Further, the upper surface of the base 31 constitutes a display surface 311 of the display device 1. Each of the base portions 31 and 91 may be either flexible or hard, but preferably has flexibility. By using the base portions 31 and 91 having flexibility, it is possible to obtain the display device 1 having flexibility, that is, for example, the display device 1 useful for constructing electronic paper.

  When each of the base portions 31 and 91 is flexible, the constituent materials thereof include, for example, polyesters such as PET (polyethylene terephthalate) and PEN (polyethylene naphthalate), polyolefins such as polyethylene, modified polyolefins, Various thermoplastic elastomers such as polyamide, thermoplastic polyimide, polyether, polyetheretherketone, polyurethane, chlorinated polyethylene, etc., or copolymers, blends, polymer alloys, etc. mainly comprising these, etc. 1 type or 2 types or more can be mixed and used.

  The average thicknesses of the base portions 31 and 91 are appropriately set depending on the constituent material, application, and the like, and are not particularly limited. However, in the case of having flexibility, the average thickness is about 20 μm or more and 500 μm or less. Preferably, it is about 25 μm or more and 250 μm or less. Thereby, size reduction (especially thickness reduction) of the display apparatus 1 can be achieved, aiming at harmony with the softness | flexibility and intensity | strength of the display apparatus 1. FIG.

  The individual electrodes 92 and the common electrode 32 that form a layer (film shape) are provided on the surfaces of the bases 31 and 91 on the display layer 4 side, that is, on the lower surface of the base 31 and the upper surface of the base 91, respectively. When a voltage is applied between the individual electrode 92 and the common electrode 32, an electric field is generated between them, and this electric field acts on electrophoretic particles (display particles) 6 described later. In the present embodiment, the individual electrode 92 is divided into a matrix (matrix), and a portion where the common electrode 32 and one individual electrode 92 overlap constitutes one pixel. Note that the common electrode 32 may also be divided into a plurality of parts in the same manner as the individual electrodes 92. Further, the individual electrode 92 may be divided into stripes, and the common electrode 32 may be similarly divided into stripes and arranged so as to intersect with each other.

The constituent materials of the electrodes 32 and 92 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, etc. An ionic substance such as NaCl, Cu (CF ₃ SO ₃ ) _{2 in} a matrix resin such as a carbon-based material such as polyacetylene, polyfluorene or a derivative thereof, or a matrix resin such as polyvinyl alcohol or polycarbonate. Various conductive materials such as dispersed ion conductive polymer materials, conductive oxide materials such as indium oxide (IO), indium tin oxide (ITO), fluorine-doped tin oxide (FTO), etc. One or more of these can be used in combination.
The average thicknesses of the electrodes 32 and 92 are appropriately set depending on the constituent material, application, etc., and are not particularly limited, but are preferably about 0.01 μm or more and 10 μm or less, preferably 0.02 μm or more and 5 μm. More preferably, it is about the following.

  Of the base portions 31 and 91 and the electrodes 32 and 92, the base portion and the electrodes (in the present embodiment, the base portion 31 and the common electrode 32) disposed on the display surface 311 side are each light transmissive. That is, it is substantially transparent (colorless and transparent, colored and transparent or translucent). Thereby, the state of the electrophoretic particles 6 in the electrophoretic dispersion 100 described later, that is, the information (image) displayed on the display device 1 can be easily recognized visually.

  The display layer 4 is provided in contact with the lower surface of the common electrode 32. In the display layer 4, a plurality of microcapsules (accommodating portions) 41 in which the electrophoretic dispersion 100 is enclosed in a capsule body (shell) 411 are held by a binder 42. As shown in FIG. 1, the microcapsule 41 is a single layer (one by one without overlapping in the thickness direction) between the substrate 3 and the circuit substrate 9 so as to be arranged in the vertical and horizontal directions, and the display layer 4. It is arrange | positioned in the whole thickness direction. That is, in the display layer 4, the microcapsules 41 adjacent to each other in the surface direction are in contact with each other and are arranged without being stacked in the thickness direction.

  In addition, even when the microcapsule 41 is sandwiched between the substrate 3 and the circuit substrate 9, the microcapsule 41 is substantially spherical (spherical) without being compressed (pressed) in the vertical direction. The microcapsule 41 is preferably present between the substrate 3 and the circuit board 9 in a state of maintaining a more spherical shape. The degree of the spherical shape of the microcapsule 41 is determined by the microcapsule 41. The ratio can be expressed using the ratio of the width of the microcapsule to the height of the microcapsule 41 (the width of the microcapsule 41 / the height of the microcapsule 41) as an index.

The width of the microcapsule 41 / the height (average value) of the microcapsule 41 is, for example, the average value of the particle diameter with respect to the height (thickness direction) and width (plane direction) of each microcapsule 41 in the display layer 4. Each is obtained and the ratio (width / height) of these average values is obtained.
The width / average height of the microcapsules 41 thus obtained is preferably 1.0 or more and 1.2 or less, and is 1.0 or more and 1.15 or less. More preferably. When the width of the microcapsule 41 / the height of the microcapsule 41 is within the above range, the microcapsule 41 exists between the substrate 3 and the circuit board 9 while maintaining a substantially spherical shape. Can be said. In this way, the microcapsules 41 having a substantially spherical shape are arranged in the display layer 4 so that those adjacent in the surface direction are in contact with each other and are not stacked in the thickness direction. Therefore, the display device 1 including the display layer 4 exhibits a high contrast.

  The constituent material of the capsule body 411 is not particularly limited. For example, gelatin, a composite material of gum arabic and gelatin, urethane resin, melamine resin, urea resin, epoxy resin, phenol resin, acrylic resin, Various resin materials such as urethane resin, olefin resin, polyamide, and polyether can be used, and one or more of these can be used in combination. Among these, it is preferable that the capsule main body 411 is mainly composed of a melamine resin. Since the melamine-based resin forms a three-dimensional network structure, the capsule body 411 formed using such a resin has excellent hardness and can maintain a spherical shape.

  As the particle size of the capsule body 411, the volume average particle size is preferably 25 μm or more and 60 μm or less, and more preferably 30 μm or more and 50 μm or less. When the particle size of the capsule body 411 is within such a range, the display layer 4 can be formed with high dimensional accuracy. If the particle size of the capsule body 411 is too smaller than the lower limit value, both surface sides of the display layer 4 may be filled with the microcapsules 41, and the display contrast may be reduced. On the other hand, when the particle size of the capsule body 411 is too larger than the upper limit value, the gap between the microcapsules 41 is also increased, which may reduce the display contrast.

  The plurality of microcapsules 41 included in the display layer 4 are preferably substantially uniform (identical) in size (particle diameter). Specifically, the variation coefficient (CV value) of the particle diameter is preferably 0% or more and 15% or less, and the variation coefficient (CV value) is more preferably 0% or more and 10% or less. Thereby, since the microcapsules 41 are arranged uniformly, the display device 1 can prevent or reduce the occurrence of display unevenness and can exhibit more excellent display performance.

  The electrophoretic dispersion liquid 100 enclosed in the capsule body 411 uses at least one type of electrophoretic particles (particles) 6 (in this embodiment, two types of colored particles 6b and white particles 6a) as a liquid phase dispersion medium. Dispersed (suspended). The dispersion of the electrophoretic particles 6 in the liquid phase dispersion medium is performed, for example, by combining one or more of the paint shaker method, the ball mill method, the media mill method, the ultrasonic dispersion method, the stirring dispersion method, and the like. Can do.

  As the liquid phase dispersion medium, those having low solubility in the capsule body 411 and relatively high insulation are preferably used. Examples of the liquid phase dispersion medium include various types of water (for example, distilled water and pure water), alcohols such as methanol, cellosolves such as methyl cellosolve, esters such as methyl acetate, ketones such as acetone, and pentane. Aliphatic hydrocarbons (liquid paraffin) such as cyclohexane, cycloaliphatic hydrocarbons such as cyclohexane, aromatic hydrocarbons such as benzene, halogenated hydrocarbons such as methylene chloride, and aromatic fluorinated rings such as pyridine. , Nitriles such as acetonitrile, amides such as N, N-dimethylformamide, carboxylates or other various oils, and the like can be used alone or as a mixture.

  Especially, as a liquid phase dispersion medium, what has aliphatic hydrocarbons (liquid paraffin) or a silicone oil as a main component is preferable. A liquid phase dispersion medium mainly composed of liquid paraffin or silicone oil is preferable because it has a high aggregation suppressing effect on the electrophoretic particles 6 and low affinity (low solubility) with the constituent material of the capsule body 411. . Thereby, it can prevent or suppress more reliably that the display performance of the display apparatus 1 deteriorates with time. In addition, liquid paraffin or silicone oil is preferable from the viewpoint of excellent weather resistance and high safety because it does not have an unsaturated bond.

  In the liquid phase dispersion medium (electrophoretic dispersion liquid 100), for example, a surfactant (anionic or cationic) such as an electrolyte or alkenyl succinate, a metal soap, a resin material, You may make it add various additives, such as a charge control agent which consists of particles, such as rubber material, oils, varnish, a compound, dispersing agents, such as a silane coupling agent, a lubricant, and a stabilizer. Furthermore, when coloring a liquid phase dispersion medium, you may make it melt | dissolve various dyes, such as an anthraquinone dye, an azo dye, an indigoid dye, in a liquid phase dispersion medium as needed.

  The electrophoretic particle 6 is a particle that has a charge and can be electrophoresed in the liquid phase dispersion medium by the action of an electric field. Any electrophoretic particles 6 may be used as long as they have a charge. Although there is no particular limitation, at least one of pigment particles, resin particles, or composite particles thereof is preferably used. used. These particles have the advantage that they are easy to manufacture and the charge can be controlled relatively easily.

  Examples of the pigment constituting the pigment particles include black pigments such as aniline black, carbon black, titanium black and copper chromite, white pigments such as titanium oxide and antimony oxide, azo pigments such as monoazo, isoindolinone, Yellow pigments such as yellow lead, red pigments such as quinacridone red and chrome vermilion, blue pigments such as phthalocyanine blue and indanthrene blue, green pigments such as phthalocyanine green, etc. They can be used in combination.

Examples of the resin material constituting the resin particles include acrylic resin, urethane resin, urea resin, epoxy resin, polystyrene, polyester, and the like, and one or more of these are combined. Can be used.
The composite particles include, for example, those in which the surface of the pigment particles is coated with a resin material or other pigment, those in which the surface of the resin particles is coated with a pigment, or a mixture in which the pigment and the resin material are mixed at an appropriate composition ratio. The particle | grains comprised by these, etc. are mentioned.

Examples of particles obtained by coating the surface of pigment particles with other pigments include those obtained by coating the surface of titanium oxide particles with silicon oxide or aluminum oxide, and such particles are suitable as white particles 6a. Used. The carbon black particles or particles covering the surface thereof are suitably used as colored particles (black particles) 6b.
Further, the shape of the electrophoretic particles 6 is not particularly limited, but is preferably spherical. In consideration of dispersibility in the liquid phase dispersion medium, the smaller electrophoretic particles 6 are preferably used. Specifically, the average particle diameter is about 10 nm or more and 500 nm or less. Preferably, it is about 20 nm or more and 300 nm or less. By setting the average particle size of the electrophoretic particles 6 within the above range, aggregation of the electrophoretic particles 6 and sedimentation in the liquid phase dispersion medium can be reliably prevented and the electrophoretic particles 6 can be dispersed in the liquid phase dispersion medium. As a result, it is possible to suitably prevent display quality deterioration of the display device 1.

  In the case of using two different types of particles as in the present embodiment, the average particle size of the two types of particles is made different. In particular, the average particle size of the white particles 6a is larger than the average particle size of the colored particles 6b. It is preferable to set. Thereby, the display contrast of the display device 1 can be further improved and the holding characteristics can be improved. Specifically, the average particle diameter of the colored particles 6b is preferably about 20 nm to 100 nm, and the average particle diameter of the white particles 6a is preferably about 150 nm to 300 nm.

  The specific gravity of the electrophoretic particles 6 is preferably set to be approximately equal to the specific gravity of the liquid phase dispersion medium. Thereby, even after the application of the voltage between the electrodes 32 and 92 is stopped, the electrophoretic particles 6 can stay in a certain position in the liquid phase dispersion medium for a long time. That is, the memory property can be given to the display device 1, and the information displayed on the display surface is held for a long time.

  The binder 42 includes, for example, the purpose of bonding the substrate 3 and the circuit board 9, the purpose of fixing the microcapsules 41 between the substrate 3 and the circuit board 9, the purpose of fixing the microcapsules 41 to each other, the common electrode 32 and the individual electrodes. Supplied for the purpose of ensuring insulation between the electrodes 92. Thereby, the durability and reliability of the display device 1 can be further improved. This binder 42 is a resin material (insulating or having a very small current) that is excellent in affinity (adhesion) with the circuit board 9, the common electrode 32, and the capsule body 411 (microcapsule 41) and has excellent insulating properties. Resin material) is preferably used.

  Examples of such a binder 42 include (meth) acrylic resins, (meth) acrylic urethane resins, polyvinyl chloride resins, polyvinylidene chloride resins, melamine resins, urethane resins, styrene resins, and alkyds. Resin, phenol resin, epoxy resin, polyester resin, polyvinyl alcohol resin, (meth) acrylic silicone resin, alkylpolysiloxane resin, silicone resin, silicone alkyd resin, silicone urethane resin, silicone polyester Resin, synthetic resin binder such as polyalkylene glycol resin, ethylene-propylene copolymer rubber, polybutadiene rubber, styrene-butanediene rubber, synthetic rubber such as acrylonitrile-butadiene rubber, or natural rubber binder Examples thereof include thermoplastic or thermosetting polymer binders such as cellulose nitrate, cellulose acetate butyrate, cellulose acetate, ethyl cellulose, hydroxypropylmethyl cellulose, and hydroxyethyl cellulose, and one or more of these are used in combination. be able to.

  Of these binders 42, the dispersibility of the microcapsules 41 is relatively good, and (meth) acrylic resins and polyesters are excellent in terms of adhesion to the circuit board 9, the common electrode 32 and the capsule body 411. Resin, urethane resin, and polyalkylene glycol resin are preferably used, and (meth) acrylic resin is particularly preferably used.

The sealing part 5 is provided between the board 3 and the circuit board 9 and along the edge thereof. The display layer 4 is hermetically sealed by the sealing portion 5. As a result, it is possible to prevent moisture from entering the display device 1 and more reliably prevent display performance deterioration of the display device 1.
Examples of the constituent material of the sealing portion 5 include thermoplastic resins such as acrylic resins, urethane resins, and olefin resins, epoxy resins, melamine resins, thermosetting resins such as phenol resins, and the like. Various resin materials etc. are mentioned, Among these, it can use combining 1 type (s) or 2 or more types. In addition, the sealing part 5 should just be provided as needed, and can also be abbreviate | omitted.
The display device 1 configured as described above operates as follows. In the following, one individual electrode 92 will be described as a representative.

When a voltage is applied between the common electrode 32 and the individual electrode 92 of the display device 1, an electric field is generated between them. According to this electric field, the electrophoretic particles 6 (colored particles 6b, white particles 6a) are electrophoresed toward one of the electrodes.
For example, when a white particle 6a having a positive charge is used and a negative charge is used as the colored particle (black particle) 6b, as shown in FIG. The white particles 6 a move to the common electrode 32 side and gather at the common electrode 32. On the other hand, the colored particles 6 b move to the individual electrode 92 side and gather at the individual electrode 92. For this reason, when the display device 1 is viewed from the display surface 311 side, the color of the white particles 6a can be seen, that is, white can be seen.

On the contrary, as shown in FIG. 2B, when the individual electrode 92 is set to a negative potential, the white particles 6 a move to the individual electrode 92 side and gather on the individual electrode 92. On the other hand, the colored particles 6 b move to the common electrode 32 side and gather at the common electrode 32. For this reason, when the display device 1 is viewed from the display surface 311 side, the color of the colored particles 6b can be seen, that is, black can be seen.
In such a configuration, by appropriately setting the charge amount of the electrophoretic particles 6 (white particles 6a and colored particles 6b), the polarity of the electrodes 32 and 92, the potential difference between the electrodes 32 and 92, and the like in each pixel, display is performed. On the display surface side of the apparatus 1, desired information (image) is displayed according to the combination of the colors of the white particles 6 a and the colored particles 6 b, the number of particles gathered at the electrodes 32 and 92, and the like.

Here, in the display device 1, since the microcapsules 41 in the display layer 4 are arranged in such a manner that those adjacent in the surface direction are in contact with each other and are not stacked in the thickness direction. The display device 1 including the layer 4 can exhibit high contrast.
In the display device 1, since the microcapsules 41 contained in the display layer 4 are present in a spherical shape, the pressure resistance and the bleed resistance are excellent. Therefore, even when the display device 1 is operated or while the display device 1 is stored, even if the display device 1 is subjected to an impact or the display surface is pressed, Dissipation of the electrophoretic dispersion liquid 100 is prevented, and the display device 1 can be stably operated for a long period of time.

  The display device 1 as described above can be manufactured as follows. That is, the display device 1 is manufactured using the display sheet 20 shown in FIG. As shown in FIG. 3, the display sheet 20 is in contact with the substrate 3, the display layer 4 provided on the substrate 3, the sealing portion 5 formed around the display layer 4, and the surface of the display layer 4. And the release sheet 8 provided. The display device 1 can be manufactured by peeling the release sheet 8 of the display sheet 20 and bonding the circuit board 9 to the surface of the display layer 4 exposed by the peeling. According to such a manufacturing method, the manufacturing of the display device 1 can be simplified.

Hereinafter, although the display sheet 20 is demonstrated, since it has already demonstrated about the board | substrate 3, the display layer 4, and the sealing part 5, below, the peeling sheet 8 is mainly demonstrated.
As shown in FIG. 3, the release sheet 8 has a sheet shape and is provided in contact with the surface of the display layer 4 (surface opposite to the substrate 3). The release sheet 8 prevents the surface of the display layer 4 from being exposed to the outside air, and prevents dust, dust, water droplets, etc. from adhering to the surface, and the surface of the display layer 4 (the binder 42 exposed on the surface of the display layer 4). ) Adhesive strength (adhesive strength). Such a release sheet 8 is peeled from the display layer 4 immediately before the circuit board 9 is bonded to the display layer 4. Thereby, the display layer 4 and the circuit board 9 can be firmly bonded (bonded).

  As shown in FIG. 4, the surface (surface on the display layer 4 side) 81 of such a release sheet 8 is a rough surface (hereinafter, also referred to as “rough surface 81”) on which minute irregularities 82 are formed. The rough surface 81 is in contact with the surface of the display layer 4. Thus, at least one surface of the release sheet 8 is a rough surface 81 on which fine irregularities 82 are formed, and the release sheet 8 is placed on the display layer 4 so that the rough surface 81 is in contact with the surface of the display layer 4. By overlapping, the contact area between the rough surface 81 of the release sheet 8 and the surface of the display layer 4 can be reduced as compared with, for example, the case where the rough surface 81 is replaced with a flat surface. Therefore, the adhesive strength between the release sheet 8 and the display layer 4 becomes an appropriate strength (not higher than necessary), and the release sheet 8 can be smoothly released from the surface of the display layer 4.

  Moreover, since the peeling sheet 8 can be smoothly peeled from the display layer 4, before and after peeling the peeling sheet 8, the shape of the surface of the display layer 4 can be kept the same shape. That is, when the display layer 4 is pulled along with the peeling of the release sheet 8, it is possible to prevent the shape of the surface of the display layer 4 after the release sheet 8 is peeled from being deformed. Therefore, the adhesion of the circuit board 9 to the surface of the display layer 4 performed after the release sheet 8 is peeled is performed without causing a problem that a gap is formed between the display layer 4 and the circuit board 9, for example. be able to.

  Further, when peeling the release sheet 8 from the display layer 4, it is possible to prevent the release sheet 8 from being torn or a part of the release sheet 8 from remaining on the surface of the display layer 4. When adhering the circuit board 9 to the surface of the layer 4, it is possible to prevent foreign matter (a part of the release sheet 8) from being mixed between the display layer 4 and the circuit board 9, and to the display layer 4. The original adhesive force can be exhibited.

  As shown in FIG. 4, the unevenness 82 formed on the rough surface 81 has a plurality of ridges 821 formed in parallel to each other at equal intervals. In other words, it can be said that the projections and depressions 82 have a plurality of ridges formed in parallel and at equal intervals, and have a plurality of ridges and a plurality of ridges formed alternately. I can say that. The top surface of each ridge 821 is in contact with the surface of the display layer 4. By making the unevenness 82 in such a configuration, the contact area between the surface of the display layer 4 and the rough surface 81 of the release sheet 8 is relatively easily compared with, for example, the case where the rough surface 81 is replaced with a flat surface. Can be made smaller. Further, since the irregularities 82 are regularly formed, the adhesive strength between the display layer 4 and the release sheet 8 is uniform over the entire surface of the display layer 4, and the release sheet 8 can be more smoothly peeled from the surface of the display layer 4. (With a certain amount of force).

  In a plan view of the display sheet 20, the extending direction of the plurality of ridges 821 may be substantially parallel to the peeling direction of the release sheet 8 or may be substantially orthogonal. In the case of being substantially parallel, the protrusions 821 give stiffness to the release sheet 8, and damage (breakage) of the release sheet 8 can be prevented. Moreover, since the contact area of the rough surface 81 and the surface of the display layer 4 becomes substantially equal over the entire peeling direction, the peeling sheet 8 can be peeled from the display layer 4 more smoothly. On the other hand, in the case of being substantially orthogonal, since the release sheet 8 can be easily bent between a pair of adjacent ridges 821 (portion where the sheet thickness is thinner than other portions), The release sheet 8 can be peeled more smoothly. Further, since the protrusions 821 (that is, the region in contact with the surface of the display layer 4) are intermittently present in the peeling direction, the peeling sheet 8 is peeled off from the surface of the display layer 4 relatively little. Can be done with force. However, the extending direction of the plurality of ridges 821 is not limited to the above direction, and for example, the extending direction of each ridge 821 may be inclined with respect to the peeling direction of the release sheet 8.

The distance D between the pair of adjacent ridges 821 is not particularly limited, but is preferably shorter than the average particle diameter of the microcapsules 41. As a result, the contact area between the rough surface 81 of the release sheet 8 and the surface of the display layer 4 can be prevented from becoming excessively small, and the release sheet 8 is unintentionally detached (peeled) from the surface of the display layer 4. Can be prevented.
The width W of each ridge 821 is not particularly limited, but is preferably shorter than the average particle diameter of the microcapsules 41. Thereby, it can prevent that the contact area of the one protruding item | line 821 and the surface of the display layer 4 becomes large too much, and can make the adhesive strength of the peeling sheet 8 and the display layer 4 moderate intensity | strength. it can.

  The area occupied by the ridges 821 with respect to the rough surface 81 is not particularly limited, but is preferably about 20% or more and about 80% or less, and more preferably about 50%. Thereby, the adhesive strength between the release sheet 8 and the display layer 4 can be set to an appropriate strength, the release sheet 8 is damaged (damage at the time of release) due to the adhesive strength being too strong, and the adhesive strength is too weak. The unintentional detachment | leave of the peeling sheet 8 by can be prevented more reliably.

  Further, the height H of the ridge 821 is not particularly limited, but is preferably about 50 μm or more and 500 μm or less, and more preferably about 100 μm or more and 400 μm or less. Thereby, the display layer 4 in a portion other than the top surface of the ridge 821 of the rough surface 81 (for example, a portion having a small sheet thickness positioned between a pair of adjacent ridges 821) while suppressing the thickness of the release sheet 8. Can be prevented from contacting the surface. Therefore, the contact area between the rough surface 81 of the release sheet 8 and the surface of the display layer 4 can be prevented from unintentionally increasing (becoming larger than the set value), and the release sheet from the surface of the display layer 4 8 can be smoothly peeled off.

Further, the thickness T of the part where the release sheet 8 is thin (the part located between a pair of adjacent ridges 821) is not particularly limited, but is preferably about 20 μm to 500 μm, preferably 25 μm. As mentioned above, it is more preferable that it is about 250 micrometers or less. Thereby, the mechanical strength of the release sheet 8 can be set to a strength sufficient to fulfill the purpose.
Examples of the release sheet 8 include polyethylene terephthalate, high-pressure low-density polyethylene, high-density polyethylene, linear low-density polyethylene, ethylene-vinyl acetate copolymer resin, unstretched polypropylene, stretched polypropylene, and stretched nylon. A plastic film, kraft paper, polyethylene laminated paper, polypropylene laminated paper, non-woven fabric, etc. composed of at least one kind as a main material can be mentioned. The release sheet 8 is not limited to the above as long as it can be adhered to the surface of the display layer 4 and can be peeled off.

Further, as the release sheet 8, a sheet having a release layer formed on the surface of the rough surface 81 along the unevenness 82 may be used. Further, as the release sheet 8, a release layer (for example, a fluorine-based release layer or a silicone release layer) is formed on the surface of various papers as described above, and the unevenness 82 as described above is formed on the surface of the release layer. A formed sheet may be used. According to the release sheet 8 having such a configuration, the release from the surface of the display layer 4 can be performed more smoothly. In addition, as described above, conventionally, when the release sheet is peeled off, a part of the release layer remains on the surface of the display layer. Such a problem can be solved by making the surface in contact with the surface of the display layer 4 rough.
Further, the method for forming the irregularities 82 is not particularly limited, but for example, it can be formed by embossing. According to the embossing, the irregularities 82 can be formed relatively easily.

Second Embodiment
Next, a second embodiment of the display device of the present invention will be described.
FIG. 5 is a cross-sectional perspective view of a release sheet included in a display sheet used for manufacturing a display device according to the second embodiment of the present invention.
Hereinafter, the display device according to the second embodiment will be described with a focus on differences from the above-described embodiments, 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 release sheet included in the display sheet used for the manufacture is different. In addition, the same code | symbol is attached | subjected to the structure similar to 1st Embodiment mentioned above.
As shown in FIG. 5, one surface of the release sheet 8A (the surface that contacts the surface of the display layer 4) is a rough surface 81A on which minute irregularities 82A are formed. Such a release sheet 8 </ b> A is provided on the display layer 4 so that the rough surface 81 </ b> A is in contact with the surface of the display layer 4.

  The unevenness 82A includes a plurality of first protrusions 821A extending in the first direction and a second protrusion 822A extending in a direction different from the first direction and intersecting the first protrusions 821A. Have. The plurality of first ridges 821A are formed in parallel with each other at equal intervals, and the plurality of second ridges 822A are also formed in parallel with each other at equal intervals. It can be said that such an unevenness 82 </ b> A has a grid-like ridge.

  By forming the unevenness 82A in such a shape, the contact area between the surface of the display layer 4 and the rough surface 81A of the release sheet 8A is relatively easily compared with, for example, the case where the rough surface 81A is replaced with a flat surface. Can be made smaller. Further, since the irregularities 82A are regularly formed, the adhesive strength between the display layer 4 and the release sheet 8A is uniform over the entire surface of the display layer 4, and the release sheet 8A is more smoothly peeled from the surface of the display layer 4. (Ie with constant force). Further, since the release sheet 8 can be peeled with the same force from any direction in a plan view of the display sheet, the release sheet 8A can be easily peeled off.

The extending direction (first direction) of the first ridge 821A is not particularly limited as long as it intersects the extending direction (second direction) of the second ridge 822A, but with respect to the second direction It is preferable that the angle is about 60 ° or more and 120 ° or less, more preferably about 90 °. Thereby, the above-mentioned effect becomes more remarkable.
The distance D ′ between the pair of adjacent first protrusions 821A (the pair of adjacent second protrusions 822A) is not particularly limited, but is preferably shorter than the average particle diameter of the microcapsules 41 (however, , Except when the separation distance D ′ is 0 (zero)). As a result, the contact area between the rough surface 81A of the release sheet 8 and the surface of the display layer 4 can be prevented from becoming excessively small, and the release sheet 8 is unintentionally detached (peeled) from the surface of the display layer 4. Can be prevented.

  The width W ′ of each first ridge 821A (each second ridge 822A) is not particularly limited, but is preferably shorter than the average particle diameter of the microcapsules 41. Thereby, it can prevent that the contact area of one 1st protruding item | line 821A (one 2nd protruding item | line 822A) and the surface of the display layer 4 becomes large too much, and the peeling sheet 8A and display layer Adhesive strength with 4 can be made moderate.

  The area occupied by the ridges (the first ridges 821A and the second ridges 822A) with respect to the rough surface 81A is not particularly limited, but is preferably about 20% or more and 80% or less, and 50%. More preferred is the degree. Thereby, the adhesive strength between the release sheet 8A and the display layer 4 can be set to an appropriate strength, the release sheet 8A is damaged (damage at the time of release) due to the adhesive strength being too strong, and the adhesive strength is too weak. The unintentional detachment of the release sheet 8A can be prevented more reliably.

The height H ′ of the first ridge 821A (second ridge 822A) is not particularly limited, but is preferably about 50 μm or more and 500 μm or less, and preferably about 100 μm or more and 400 μm or less. Is more preferable. Thereby, it is possible to prevent contact with the surface of the display layer 4 at portions other than the top surfaces of the first and second ridges 821A and 822A of the rough surface 81A while suppressing the thickness of the release sheet 8A. it can. Therefore, the contact area between the rough surface 81A of the release sheet 8A and the surface of the display layer 4 can be prevented from unintentionally increasing, and the release sheet 8A can be smoothly peeled from the surface of the display layer 4. Can do.
Also by such 2nd Embodiment, the effect similar to 1st Embodiment can be exhibited.

<Third Embodiment>
Next, a third embodiment of the display device of the present invention will be described.
6 is a cross-sectional view of a display sheet used for manufacturing the display device according to the third embodiment of the present invention, and FIG. 7 is a cross-sectional view of the display device manufactured using the display sheet shown in FIG.
Hereinafter, the display device according to 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 of the present invention is the same as the display device according to the first embodiment, except that the configuration of the display layer of the display sheet used for manufacturing the display device is different. In addition, the same code | symbol is attached | subjected to the structure similar to 1st Embodiment mentioned above.
As shown in FIG. 6, in the display sheet 20B, the display layer 4B includes a microcapsule-containing layer 43B having microcapsules 41 and a binder 42, and an adhesive layer 44B provided on the surface of the microcapsule-containing layer 43B. Has been. In such a display sheet 20B, the rough surface 81 of the release sheet 8 is provided in contact with the surface of the adhesive layer 44B. Note that the microcapsule-containing layer 43B has the same configuration as the display layer 4 of the first embodiment described above, and thus the description thereof is omitted.

  The adhesive layer 44B has a function of more reliably fixing the display layer 4B (microcapsule-containing layer 43B) and the circuit board 9. That is, it has a function of improving the adhesive force on the surface of the display layer 4B. The constituent material of the adhesive layer 44B is not particularly limited. For example, from the viewpoint of excellent adhesion to the circuit board 9, the binder 42, and the microcapsule 41, (meth) acrylic resin, polyester resin, Polymer adhesive materials such as urethane resins and polyalkylene glycol resins are preferably used, and among them, (meth) acrylic resins are particularly preferably used.

  Further, the adhesive layer 44B may have conductivity. In this case, those having conductive anisotropy in the vertical direction are more preferable. In order to impart conductivity to the adhesive layer 44B, for example, an electrolyte, a polymer electrolyte, a solid electrolyte, a quaternary ammonium salt, a conductive metal powder, a ferrofluid, a non-reactive solvent, a conductive organic compound are added to the resin. One or a combination of two or more selected from among them may be added.

A display device 1B as shown in FIG. 7 can be manufactured by peeling the release sheet 8 of the display sheet 20B and adhering the circuit board 9 to the surface of the display layer 4B exposed by the release.
According to the third embodiment, the same effect as that of the first embodiment can be exhibited.

<Fourth embodiment>
Next, a display device according to a fourth embodiment of the invention will be described.
FIG. 8 is a cross-sectional view of a display sheet used for manufacturing a display device according to the fourth embodiment of the present invention, and FIG. 9 is a cross-sectional view of the display device manufactured using the display sheet shown in FIG.
Hereinafter, the display device of the fourth embodiment will be described focusing on the differences from the above-described embodiment, and the description of the same matters will be omitted.

The display device according to the fourth embodiment of the present invention is the same as the display device according to the first embodiment, except that the configuration of the display layer of the display sheet used for manufacturing the display device 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, in the display layer 4C included in the display sheet 20C of the present embodiment, each microcapsule 41C has a flat shape extending in the horizontal direction. In other words, the microcapsule 41C forms a stone wall structure. In the display device 1 </ b> C manufactured using the display sheet 20 </ b> C having such a configuration, the effective display area is increased and the contrast is good. In addition, since the moving distance of the electrophoretic particles 6 in the vertical direction can be shortened, the display color switching speed can be improved.

  The display layer 4C having such a configuration can be formed, for example, by sandwiching a spherical capsule main body 411C between the substrate 3 and the circuit substrate 9 and compressing in the vertical direction. Further, for example, the capsule body 411C can be softened by being made of gelatin or the like, and can be formed by deforming each microcapsule 41C into a flat shape by its own weight on the substrate 3.

A display device 1C as shown in FIG. 9 can be manufactured by peeling the release sheet 8 of the display sheet 20C and adhering the circuit board 9 to the surface of the display layer 4C exposed by the release.
The display layer 4C may have an adhesive layer as in the third embodiment described above.
According to the fourth embodiment, the same effect as that of the first embodiment can be exhibited.

<Fifth Embodiment>
Next, a display device according to a fifth embodiment of the invention will be described.
FIG. 10 is a cross-sectional view of a display sheet used for manufacturing a display device according to the fifth embodiment of the present invention, and FIG. 11 is a cross-sectional view of the display device manufactured using the display sheet shown in FIG.
Hereinafter, the display device of the fifth embodiment will be described focusing on the differences from the above-described embodiment, and description of similar matters will be omitted.

The display device according to the fifth embodiment of the present invention is the same as the display device of the first embodiment, except that the configuration of the display layer included in the display sheet used for manufacturing the display device is different. In addition, the same code | symbol is attached | subjected to the structure similar to 1st Embodiment mentioned above.
As shown in FIG. 10, in the display layer 4 </ b> D included in the display sheet 20 </ b> D of the present embodiment, the unevenness 45 </ b> D is formed on the surface (the surface on the release sheet 8 side). The unevenness 45 </ b> D has a shape that follows (along) the outer periphery of each microcapsule 41. In this way, by forming the unevenness 45D on the surface of the display layer 4D, the contact area with the release sheet 8 is less than when the surface of the display layer 4D is a flat surface (for example, in the case of the first embodiment). can do. Therefore, the release sheet 8 can be smoothly peeled from the surface of the display layer 4D.

A display device 1D as shown in FIG. 11 can be manufactured by peeling the release sheet 8 of the display sheet 20D and bonding the circuit board 9 to the surface of the display layer 4D exposed by the release. In addition, since the circuit board 9 is adhered to the display layer 4D by pressing the circuit board 9 against the display layer 4D, in the display device 1D, the surface of the display layer 4D is substantially planarized (that is, unevenness). 45D has been removed).
According to the fifth embodiment, the same effect as that of the first embodiment can be exhibited.

<Sixth Embodiment>
Next, a sixth embodiment of the display device of the present invention will be described.
12 is a cross-sectional view of a display sheet used for manufacturing the display device according to the sixth embodiment of the present invention, and FIG. 13 is a cross-sectional view of the display device manufactured using the display sheet shown in FIG.
Hereinafter, the display device according to the sixth embodiment will be described with a focus on differences from the above-described embodiments, and description of similar matters will be omitted.

The display device according to the sixth embodiment of the present invention is the same as the display device of the first embodiment except that the configuration of the display layer included in the display sheet used for manufacturing the display device is different. In addition, the same code | symbol is attached | subjected to the structure similar to 1st Embodiment mentioned above.
As shown in FIG. 12, in the display sheet 20E of the present embodiment, the display layer 4E is provided in a matrix, and a cell array layer 47E having a plurality of cells (accommodating portions) 46E filled with the electrophoretic dispersion liquid 100. And an adhesive layer 44E provided on the surface of the cell array layer 47E. In such a display sheet 20E, the rough surface 81 of the release sheet 8 is provided in contact with the surface of the adhesive layer 44E.

The cell array layer 47E includes a base body 471E having a plurality of concave portions (portions serving as internal spaces of the cells 46E) and a lid 472E provided so as to cover the openings of the concave portions of the base body 471E. After filling each recess formed in the base 471E with the electrophoretic dispersion liquid 100, each recess can be sealed with a lid 472E.
As a constituent material of the base 471E and the lid 472E, a material having a relatively high insulating property can be used. For example, polyolefin such as polyethylene, modified polyolefin, polyamide, thermoplastic polyimide, polyether, polyetheretherketone, polyurethane And various thermoplastic elastomers such as chlorinated polyethylene and the like, or copolymers, blends, and polymers mainly composed of these.

  The adhesive layer 44E has a function of more reliably fixing the display layer 4E (cell arrangement layer 47E) and the circuit board 9. The constituent material of the adhesive layer 44E is not particularly limited. For example, from the viewpoint of excellent adhesion to the circuit board 9 and the cell 46E, (meth) acrylic resin, polyester resin, urethane resin, polyresin Polymer adhesive materials such as alkylene glycol resins are preferably used, and (meth) acrylic resins are particularly preferably used among them.

  Further, the adhesive layer 44B may have conductivity. In this case, those having conductive anisotropy in the vertical direction are more preferable. In order to impart conductivity to the adhesive layer 44B, for example, an electrolyte, a polymer electrolyte, a solid electrolyte, a quaternary ammonium salt, a conductive metal powder, a ferrofluid, a non-reactive solvent, a conductive organic compound are added to the resin. One or a combination of two or more selected from among them may be added.

A display device 1E as shown in FIG. 13 is manufactured by peeling the release sheet 8 of the display sheet 20E and bonding the circuit board 9 to the surface of the display layer 4E (adhesive layer 44E) exposed by the peeling. can do.
If the surface of the cell array layer 47E (the surface on the release sheet 8 side) has adhesive strength, the adhesive layer 44E may be omitted.
Also according to the sixth embodiment, the same effect as that of the first embodiment can be exhibited.

<Seventh embodiment>
Next, a seventh embodiment of the display device of the present invention will be described.
14 is a cross-sectional view of a display sheet used for manufacturing a display device according to a seventh embodiment of the present invention, and FIG. 15 is a cross-sectional view of the display device manufactured with the display sheet shown in FIG.
Hereinafter, the display device according to the seventh embodiment will be described focusing on differences from the above-described embodiment, and description of similar matters will be omitted.

The display device according to the seventh embodiment of the present invention is the same as the display device according to the first embodiment, except that the configuration of the display layer of the display sheet used for manufacturing the display device is different. In addition, the same code | symbol is attached | subjected to the structure similar to 1st Embodiment mentioned above.
As shown in FIG. 14, in the display sheet 20F of the present embodiment, the display layer 4F includes a cell array layer 47F having a plurality of cells (accommodating portions) 46F provided in a matrix, and a surface of the cell array layer 47F. It is comprised with the provided adhesive layer 44F. In each cell 46F, white particles 7a and colored particles 7b charged to opposite poles are scattered. That is, in the above-described embodiment, the particles are dispersed in the liquid, whereas in the present embodiment, the particles are scattered in the gas.

A display device 1F as shown in FIG. 15 is manufactured by peeling the release sheet 8 of the display sheet 20F and bonding the circuit board 9 to the surface of the display layer 4F (adhesive layer 44F) exposed by the release. can do.
Also according to the seventh embodiment, the same effect as that of the first embodiment can be exhibited.

<Eighth Embodiment>
Next, an eighth embodiment of the display device of the present invention will be described.
FIG. 16: is sectional drawing of the peeling sheet which the display sheet used for manufacture of the display apparatus concerning 8th Embodiment of this invention has.
Hereinafter, the display device of the eighth embodiment will be described focusing on the differences from the above-described embodiment, and description of similar matters will be omitted.

The display device according to the eighth embodiment of the present invention is the same as the display device of the first embodiment, except that the release sheet included in the display sheet used for the manufacture has conductivity. In addition, the same code | symbol is attached | subjected to the structure similar to 1st Embodiment mentioned above.
In the display sheet 20G of the present embodiment, the release sheet 8G has conductivity. Thus, when the release sheet 8G has conductivity, the release sheet 8G can be used as an inspection electrode when inspecting the display characteristics of the display sheet 20G.

  Specifically, before the display sheet 20G is bonded to the circuit board 9, it is usually checked whether or not the display characteristics of the display sheet 20G are desired. Then, only the display sheet recognized as having a predetermined display characteristic by this inspection is bonded to the circuit board 9 to manufacture a display device. As a result, the yield of the display device is improved and the manufacturing cost can be reduced because the circuit board 9 does not have to be wasted.

  In this inspection, a pair of electrodes are arranged via the display layer 4, and a voltage is applied between the pair of electrodes, so that the electrophoretic particles 6 in each microcapsule 41 are migrated in a desired direction and are moved. The display layer 4 is observed from the substrate 3 side or the release sheet 8G side. In the display sheet 20G of the present embodiment, since the conductive member, that is, the common electrode 32 and the release sheet 8G are disposed to face each other through the display layer 4, by using these as a pair of inspection electrodes, separately. Even without arranging the electrodes, the display characteristics of the display sheet 20G can be easily inspected.

Here, it is preferable that at least one of the release sheet 8G and the substrate 3 provided with the common electrode 32 is substantially transparent. Thereby, since the display layer 4 can be observed through the peeling sheet 8G or the substrate 3 provided with the common electrode 32, the display characteristics of the display sheet 20G can be more easily inspected.
In addition, a plurality of ridges 821 are formed on the rough surface 81 of the release sheet 8G, as in the first embodiment described above, and the plurality of ridges 821 are formed in parallel and at equal intervals. Yes. In the present embodiment, the width W ″ of each ridge 821 is preferably set to 100 μm or less. Since the ridge 821 having a width W ″ of 100 μm or less is difficult to be confirmed by human eyes, as described above. In the display characteristic inspection, when the display layer 4 is observed from the release sheet 8G side, the display characteristic inspection can be performed more accurately. That is, it is possible to prevent an error in the determination of display characteristics due to the influence of the ridge 821. If the width W ″ of the ridge 821 is 100 μm or less, the contact area between one ridge 821 and the surface of the display layer 4 is prevented from becoming excessively large, and the separation sheet 8A and the display layer 4 Adhesive strength can also be made moderate.

The configuration of the release sheet 8G as described above is not particularly limited as long as it has conductivity, and includes, for example, a sheet-like base material and a conductive layer formed on one surface of the base material. can do. In the case of such a configuration, the surface of the conductive layer is preferably a rough surface 81 in contact with the display layer 4. Thereby, a voltage can be reliably applied to the display layer 4.
As the base material, for example, at least one of polyethylene terephthalate, high pressure method low density polyethylene, high density polyethylene, linear low density polyethylene, ethylene-vinyl acetate copolymer resin, unstretched polypropylene, stretched polypropylene and stretched nylon is used. Examples of the main material include plastic film, kraft paper, polyethylene laminated paper, polypropylene laminated paper, and nonwoven fabric.

In addition, the constituent material of the conductive layer is not particularly limited as long as it is substantially conductive. For example, a metal material such as gold, silver, copper, aluminum or an alloy containing these, carbon such as carbon black, etc. An ionic substance such as NaCl, Cu (CF ₃ SO ₃ ) ₂ is dispersed in an electroconductive polymer material such as polyacetylene, polyfluorene or derivatives thereof, or a matrix resin such as polyvinyl alcohol or polycarbonate. Various conductive materials such as ion conductive polymer materials, conductive oxide materials such as indium oxide (IO), indium tin oxide (ITO), and fluorine-doped tin oxide (FTO) can be mentioned. Any material may be used as long as it is a combination of one or more of the above.

Alternatively, as the release sheet 8 having conductivity, a conductive sheet such as an aluminum foil, a SUS foil, or a copper foil may be used. The release sheet 8 may have a configuration in which a release agent layer is formed on the surface of the conductive layer. Thereby, peeling from the display layer 4 of the peeling sheet 8 becomes easier. Although it does not specifically limit as a mold release agent layer, What is comprised as a main material at least 1 sort (s) of a silicone type mold release agent, a fluorine type mold release agent, and a modified silicone type mold release agent is mentioned.
Also according to the seventh embodiment, the same effect as that of the first embodiment can be exhibited.

Each of the display devices 1 as 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. 17 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. 17 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 1 as described above.

Next, an embodiment when the electronic apparatus of the present invention is applied to a display will be described.
FIG. 18 is a diagram showing an embodiment when the electronic apparatus of the present invention is applied to a display. 18A is a sectional view, and FIG. 18B is a plan view.
A display (display device) 800 illustrated in FIG. 18 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. 18), and two pairs of conveying rollers 802a and 802b are provided inside. 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. 18B), 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.

Further, a terminal portion 806 is provided at the leading end portion (left side in FIG. 18) of the electronic paper 600 in the insertion direction, and the terminal with the electronic paper 600 installed on the main body portion 801 is provided inside the main body portion 801. A socket 807 to which the unit 806 is connected 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.

  As described above, the display sheet, the display device, and the electronic device of the present invention have been described based on the illustrated embodiments, but the present invention is not limited to these. For example, in the display sheet, the display device, and the electronic apparatus of the present invention, the configuration of each part can be replaced with any configuration that exhibits the same function, and any configuration can be added. In addition, the display sheet, the display device, and the electronic device may be a combination of any two or more configurations (features) of the above embodiments.

In the above-described embodiment, the configuration in which the unevenness formed on the rough surface of the release sheet is regularly formed has been described. However, the shape of the unevenness is not limited to this, and is an uneven unevenness. May be. Specifically, the unevenness may be a shape in which a plurality of recesses having different sizes and shapes are irregularly arranged.
Moreover, it is not specifically limited as a shape of the unevenness | corrugation formed in the rough surface of a peeling sheet, The shape in which the several recessed part is formed regularly or irregularly may be sufficient. In this case, the cross sectional shape (planar shape) of the recess is not particularly limited, and may be, for example, a circle, a triangle, a quadrangle, a pentagon or more polygon, an irregular shape, and the like.

  In the above-described embodiment, the unevenness formed on the rough surface of the release sheet has been described as having a plurality of protrusions. However, the present invention is not limited to this. For example, the unevenness has a plurality of protrusions. May be. Further, in the above-described embodiment, the top surface of the ridges of the unevenness formed on the rough surface of the release sheet is a flat surface, but is not limited thereto, and the top surface of the ridges is rounded. May be.

  1, 1B, 1C, 1D, 1E, 1F... Display device 100... Electrophoretic dispersion liquid 2... Display substrate 20, 20B, 20C, 20D, 20E, 20F, 20G ... Display sheet 3. ... base 311 ... display surface 32 ... common electrode 4, 4B, 4C, 4D, 4E, 4F ... display layer 41, 41C ... microcapsule 411, 411C ... capsule body 42 ... binder 43B ... microcapsule Contained layer 44B, 44E, 44F …… Adhesive layer 45D …… Unevenness 46E, 46F …… Cell 47E, 47F …… Cell array layer 471E …… Substrate 472E …… Cover body 5 …… Sealing part 6 …… Electrophoretic particles 6a, 7a ... White particles 6b, 7b ... Colored particles 8, 8A, 8G ... Release sheet 81, 81A ... Rough surface 82, 82A ... Unevenness 82 DESCRIPTION OF SYMBOLS 1 ... Projection 821A ... 1st projection 822A ... 2nd projection 9 ... Circuit board 91 ... Base 92 ... Individual electrode 93 ... Opposite substrate 600 ... Electronic paper 601 ... Main body 602 …… Display unit 800 …… Display 801 …… Main body part 802a, 802b …… Conveying roller pair 803 …… Hole part 804 …… Transparent glass plate 805 …… Insertion slot 806 …… Terminal part 807 …… Socket 808 …… Controller 809 …… Operation unit

Claims (9)

A substrate;
A display layer that is provided on the surface of the base material and has a plurality of storage portions that movably store particles, and the surface has an adhesive force or an adhesive force;
None of the sheet, a rough surface at least one surface is formed a minute uneven, as crude surface contacts the surface of the display layer, and a release sheet are superimposed on the display layer, the Have
Each of the plurality of accommodating portions is a microcapsule having a spherical shape,
The unevenness has a plurality of ridges extending in a predetermined direction and adjacent to each other,
The width of the ridge is smaller than the average particle size of the microcapsule,
A display sheet , wherein a pair of adjacent convex separation distances is smaller than an average particle diameter of the microcapsules . The extending direction of each said ridges, in a plan view of the release sheet, display sheet of claim 1 is parallel to the peeling direction of the release sheet. The extending direction of each said ridges, in a plan view of the release sheet, display sheet of claim 1 which is perpendicular to the peeling direction of the release sheet.   A substrate;
  A display layer that is provided on the surface of the base material and has a plurality of storage portions that movably store particles, and the surface has an adhesive force or an adhesive force;
  A release sheet that is in the form of a sheet and has a rough surface on which at least one surface is formed with minute irregularities, and is laminated on the display layer so that the rough surface is in contact with the surface of the display layer. Have
  Each of the plurality of accommodating portions is a microcapsule having a spherical shape,
  The concave and convex portions extend in a first direction and are separated from each other by a plurality of first ridges, and extend in a direction different from the first direction. And a second ridge that intersects the ridge of
  The width of the first ridge and the width of the second ridge are each smaller than the average particle diameter of the microcapsules,
  The display sheet, wherein the pair of adjacent first convex spacing distances and the pair of adjacent second convex spacing distances are smaller than the average particle diameter of the microcapsules, respectively. The display layer has an adhesive layer,
The display sheet according to claim 1, wherein the rough surface of the release sheet is in contact with the surface of the adhesive layer. Each of the plurality of accommodating portions is a microcapsule having a spherical shape,
Wherein the surface of the display layer, the display sheet according to any one of the claims 1 irregularities are formed along the outer shape of the microcapsules 5. The release sheet, display sheet according to any one of claims 1 to 6 having conductivity. Display device, characterized in that it is produced using the display sheet according to any one of claims 1 to 7. An electronic apparatus comprising the display device according to claim 8 .

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