JP2002072258A - Electrophoretic display device and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrophoretic display device which is flexible and does not lose memory property of display even when it is deformed, and to provide a method of manufacturing the device by which a migration dispersion liquid is easily injected and sealed in a display section. SOLUTION: The electrophoretic display device is equipped with a flexible supporting body 20, a top plate 18 having flexibility and elasticity to stress and facing the supporting body 20 through barrier walls 15, and a migration dispersion liquid having migration particles 16 dispersed in an insulating liquid 17 in the section formed by these members 20, 15, 18. The method of manufacturing the device includes processes of forming the barrier walls 15 on the flexible supporting body 20, injecting the migration dispersion liquid having the migration particles 16 dispersed in the insulating liquid 17 into the section formed by the above members, applying a photosetting or thermosetting liquid incompatible with the liquid 17 by spraying or the like thereon and curing the liquid to form the top plate 18 to seal the whole body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophoretic display device.

[0002]

2. Description of the Related Art In recent years, with the development of information equipment, the need for rewritable electronic paper having both the convenience of paper media and the electronic media function of a portable personal computer, so-called "paper-like display" has been increasing. A display device used for a paper-like display has low power consumption, is thin, has paper-like flexibility, and can respond to bending. One or a plurality of such display devices are formed into one paper-like display. Used in displays.

[0003] Therefore, research and development of a display device meeting these needs have been actively conducted. Among them, the liquid crystal display device is capable of electrically controlling the arrangement of liquid crystal molecules and changing the optical characteristics of the liquid crystal, and is being actively developed as a display device capable of meeting the above needs. However, in these liquid crystal display devices, it is difficult to see the characters on the screen due to the angle at which the screen is viewed or reflected light, and the flicker of the light source.
The burden on vision resulting from low brightness and the like has not yet been sufficiently solved. In addition, since it is necessary to control the alignment of liquid crystal molecules and precisely control the liquid crystal cell gap,
It is difficult to achieve compatibility with flexibility.

[0004] As one of the technologies capable of realizing a flexible reflective display device, there is known an electrophoretic display device which performs display by moving colored charged particles in an insulating liquid (for example, an electrophoretic display device). U.S. Pat. No. 366
No. 8106). FIG. 4 shows a cross-sectional view of the most typical electrophoretic display device.

[0005] The apparatus shown in the figure is composed of colored charged particles (electrophoretic particles).
And a pair of electrodes 4 opposed to each other with the electrophoretic dispersion liquid therebetween.
2 and 43 are provided. Reference numeral 41 denotes a substrate that forms a support together with the electrodes 42, and 48 denotes a top plate. By applying a voltage to the electrophoretic dispersion liquid via the electrodes 42 and 43, the electrophoretic particles 46 are electrophoresed and fixed on the electrode biased to the opposite polarity to perform display. The display shows the migrating particles 46.
And the color of the colored dispersion medium 47 dyed. That is, the migrating particles 46 are placed on the first electrode 4 close to the observer.
2 (a), the color of the migrating particles 46 is displayed, and conversely, if it adheres to the second electrode 43 far from the observer (b), the color of the colored dispersion medium 47 is displayed.

This device can be made thinner in principle, and a flexible display device can be obtained by using flexible materials for the substrate and constituent members.

[0007] The display image holding performance (hereinafter referred to as "display memory property") is such that the circuit is kept open immediately after the voltage is applied, the charge is held on the electrode, and the charged fine particles are charged by the Coulomb force of the electrode holding charge. By adsorbing and holding.

[0008] If the decrease of the electrode-holding charge with time is suppressed by selecting the material of the insulating layer or the like, the electrophoretic particles are held on the electrode for a relatively long time, so that the display is performed without supplying any external power. Can be maintained for a long time.

Although an electrophoretic display device originally operates at a lower current than other types of devices such as a liquid crystal display device, the average power consumption can be further increased when the display is not frequently rewritten due to the memory property. Can be reduced.

[0010]

However, the conventional electrophoretic display has the following problems. First, there is a problem in injecting the electrophoretic dispersion liquid between the substrates when manufacturing the electrophoretic display device. In an example of the manufacturing process, first, the upper and lower two substrates constituting the electrophoretic display device are
Laminate while leaving the electrophoresis dispersion liquid inlet. Then, the electrophoretic dispersion liquid is injected from the injection port. However, the spacer and the partition wall provided to keep a constant distance between the two substrates become obstacles, and the injection cannot be performed smoothly. Also, when injecting the electrophoretic dispersion liquid from the end, the dispersion medium easily enters, but the electrophoretic particles may be caught by the spacers and partition walls, so that the concentration of the electrophoretic particles is high near the inlet, and as the distance from the inlet increases. The concentration of the migrating particles is reduced, which adversely affects display uniformity.

In another example of the manufacturing process of the electrophoretic display device, after a spacer and a partition are provided on the lower substrate, the electrophoretic dispersion liquid is uniformly dropped on the lower substrate, and then the upper substrate is adhered.
Seal around. However, in this method, in-plane uniformity of the concentration of the migrating particles can be realized, but there is a problem that air bubbles are apt to be mixed in bonding the upper substrate.

Secondly, since the electrophoretic display device is composed of two upper and lower substrates, even if both of these substrates are changed to a material having flexibility, if the display device is deformed by bending, However, since the difference between the inner and outer peripheries of the bending deformation cannot be absorbed, the user feels stiff and cannot achieve paper-like flexibility.

Third, when flexibility is given to the display device, the internal insulating liquid flows due to the deformation of the display device, and the electrophoretic particles adsorbed by the electrostatic interaction with the electrode-holding charge are removed. Because of the flushing, there is a problem that the display is broken and the memory of the display is lost. The present invention has been made to solve the above problems.

A first object of the present invention is to provide a method for manufacturing an electrophoretic display device in which injection and sealing of an electrophoretic dispersion liquid are easy. A second object of the present invention is to provide an electrophoretic display device having flexibility corresponding to bending. A third object of the present invention is to provide an electrophoretic display device which does not lose display memory even when deformed.

[0015]

The inventor of the present invention has made various studies to solve the above-mentioned problems, and as a result, has accomplished the following invention. That is, the method of manufacturing an electrophoretic display device of the present invention is a method of manufacturing an electrophoretic display device that performs display by moving electrophoretic particles dispersed in an insulating liquid in accordance with the direction of an electric field. Providing a plurality of partitions on a support having: a step of injecting an electrophoretic dispersion in which migrating particles are dispersed in an insulating liquid into a section formed by the support and the plurality of partitions; A step of applying a liquid that is incompatible with the insulating liquid and is cured by light, heat, or drying on both the electrophoretic dispersion liquid and the partition walls; and curing the applied liquid to form a top plate. And sealing the whole.

By manufacturing in this way, it is possible to inject the electrophoretic dispersion having a uniform electrophoretic particle concentration into any section of the display device. The application of the liquid is preferably performed by spraying using a spray device.

An electrophoretic display device according to the present invention is an electrophoretic display device for performing display by moving electrophoretic particles dispersed in an insulating liquid in accordance with the direction of an electric field. A top plate facing the support with a plurality of partitions interposed therebetween, the top plate being expandable and contractable with respect to surface stress, and an insulating liquid in a section formed by the support, the plurality of partitions and the top plate. And an electrophoretic dispersion liquid in which electrophoretic particles are dispersed.

As described above, a flexible electrophoretic display device capable of responding to bending can be obtained by using a material in which the top plate of the display device bends together with the support, that is, by using a material that can expand and contract against surface stress. I understood. In addition, since the stress generated when the display device is deformed is absorbed by the deformation of the top plate, the flow of the electrophoretic dispersion liquid in the display device can be suppressed, and the display memory performance is not lost. Was found to be obtained.

[0019]

Embodiments of the present invention will be described below. Configuration FIG. 1 is a sectional view showing an example of the electrophoretic display device of the present invention. The basic configuration of the display device of the present invention will be described with reference to FIG. In FIG. 1, a film-shaped first electrode 12 is provided on a flexible substrate 11, and a plurality of line-shaped second electrodes 13 are provided above the flexible substrate 11 at regular intervals in parallel with each other. In FIG. 1, the first electrode 12 extends in the left-right direction. An insulating layer 14 is provided between the first electrode 12 and the second electrode 13 and around the second electrode so as to maintain insulation between the electrodes and prevent the electrodes from directly touching the electrophoretic dispersion. Each of the second electrodes 13 extends in the front-back direction on the paper surface of FIG. The width of the second electrode 13 (width in the horizontal direction in the figure) is smaller than the width of the first electrode (not shown). here,
The flexible support 20, including the flexible substrate 11, the first electrode 12, the second electrode 13, and the insulating layer 14, will be collectively referred to as a flexible support 20.

On the insulating layer 14 of the flexible support 20, a plurality of flexible partitions 15 are formed in parallel with each other.
3 are provided in parallel and at the same interval. Pixels are formed by a combination of a wide first electrode 12 and a narrow second electrode 13 that are orthogonal to each other. The partition has a rectangular (or square) frame shape surrounding pixels including the bodies of the electrodes 12 and 13. The upper part of the flexible partition 15 is entirely covered with a top plate 18 parallel to the flexible substrate 11. This top plate 18 can be deformed together with the substrate 11. The term “deformation” means to include bending or expansion and contraction.

A flexible support 20, a flexible partition 15, and a flexible / stretchable top plate (hereinafter simply referred to as "stretchable top plate") 1
A space surrounded by 8 is a display section, and contains a migration dispersion liquid including the migration particles 16 and the insulating dispersion medium 17.

As shown in FIG. 2, a protective film 19 may be coated on the elastic top plate 18. In this method, for example, a film made of a polymer material or the like is used as the top plate, and it is conceivable that a low-molecular substance permeates the film. The protective film 19 may be used for the purpose of preventing the components of the electrophoretic dispersion liquid from evaporating, improving the gas barrier performance of the elastic top plate 18, and improving the mechanical strength.

Materials Next, materials used for the electrophoretic display device of the present invention will be described. 1. Flexible Substrate For the flexible substrate 11, many transparent and flexible resin materials can be used. For example, polyester, polyethylene, polypropylene, polyethersulfone, polycarbonate, polymethacrylate, and acryl are exemplified. The thickness is about 50 to 200 μm.

2. Insulating Layer As a material of the insulating layer 14, the same resin material as that of the flexible substrate can be used. Also, polyimide or the like can be used. The thickness is about 0.5 to 2.0 μm.

3. Flexible Partition The material of the flexible partition 15 may be the same resin material as that of the flexible substrate. The height of the partition is about 10 to 50 μm, the width is about 5 to 15 μm, and the aspect ratio (height / width)
Is about 2 to 3. The flexible partition wall may be formed integrally with the flexible support, or may be provided on the flexible support later using a photosensitive material. The flexible partition is the top plate 1
It is preferable not to be bonded to 8. In that case, when the display device is bent, the partition wall and the top plate are shifted. In order to shift, it is preferable to select a material in which both are hardly compatible.

4. Stretchable top plate For the stretchable top plate 18, it is preferable to use a material that can expand and contract according to the deflection of the flexible substrate, that is, the top plate bends together with the substrate. The Young's modulus is 100% or less of the substrate, preferably in the range of 0.001 to 10%. 1 for thickness
It is about 0 to 500 μm. Such materials include
Rubber-based resins such as isoprene, butadiene and silicone, and copolymers of styrene and acrylonitrile with isoprene and butadiene are exemplified. Besides, polyvinylidene chloride, copolymer nylon or ethylene-propylene copolymer may be used. In particular, in the case of a block copolymer, a material which is excellent in both mechanical strength and elasticity and hardly generates cracks even when bent can be obtained. These stretchable materials can be dissolved in an appropriate solvent, applied to the partition walls and the electrophoretic dispersion by spraying or the like, and dried from the surface to form a top plate. Further, a liquid in which a polymerizable monomer and a suitable polymerization initiator that reacts with heat or light in the rubber-based resin or copolymer described above are blended, applied by spraying or the like, and polymerized and cured by heating or light irradiation, It can also be a top plate.

5. Protective Film The protective film 19 is not necessarily required if the gas barrier performance and mechanical strength of the elastic top plate are sufficient, but the use of the protective film broadens the selection range of the elastic top plate material. The protective film must have elasticity, but a few μm
Since a thin film may be used, the same resin material as that for the flexible substrate can be used. Specifically, about 1 to 10 μm, preferably 1
About 3 μm.

6. Electrophoretic dispersion 6-1. Dispersion Medium As the insulating dispersion medium 17, paraffinic hydrocarbons (normal paraffin, isoparaffin), halogenated hydrocarbons, silicone oil, and the like can be used. Above all, isoparaffin is suitable because it has characteristics such as good dispersibility of dielectric particles, low cost, and low harm to the human body. Representative examples of commercially available isoparaffins include Shellsol 70, 71, 72 (all manufactured by Shell Japan KK), Isopar G, H, L, and M.
(Exxon Chemical Co., Ltd.), IP Solvent 1
620, 2028, and 2835 (all manufactured by Idemitsu Petrochemical Co., Ltd.).

6-2. Electrophoretic Particles As the electrophoretic particles 16, various inorganic and organic dielectrics can be widely used. As inorganic substances, glass, alumina,
Examples include zirconia, titanium oxide, and silicon nitride. Various pigments and resins can be used as the organic substance. Examples of the resin include polystyrene, polyacrylate, polymethacrylate, polyacrylonitrile, rubber resins such as inoprene and butadiene, polyester, polyurethane, polyamide,
Examples include epoxy resin, rosin, polycarbonate, phenolic resin, chlorinated paraffin, polyethylene, polypropylene, silicone resin, Teflon (registered trademark) and derivatives thereof, and copolymers and mixtures thereof.

6-3. Electrophoretic particle coloring agent When resin electrophoretic particles are used, if coloring is necessary, they are colored with carbon black, various pigments, various dyes, or the like. The material for electrophoretic particles mixed with a coloring agent has a diameter of 0.1
It is processed into particles of about μm to several tens μm for use. The shape of the particles is preferably spherical.

6-4. Charge Control Agent It is desirable to mix an appropriate amount of a charge control agent (charge control agent) in order to give a specific charge to the surface of the migrating particles 16 and to improve the migration characteristics and dispersion stability in the insulating dispersion medium. Examples of the charge control agent include sodium dioctyl sulfosuccinate (American cyanamide) and metal soap as positive charge control agents. Examples of the negative charge control agent include soy lecithin and alkenyl succinate polyimide (for example, OLON-1200 and OLOA manufactured by Olonite Japan).
-4375H), basic calcium petronates and basic barium petronates of petroleum sulfonates (manufactured by Witco Chemical), and the like. The charge control agent is used by dissolving it in an insulating liquid. When the electrophoretic particles are dispersed and stirred here, the charge control agent is adsorbed on the electrophoretic particle surface, and a specific charge is generated in the liquid. The charge controlling agent is added in an amount of about 0.01 to about 10% by weight of the electrophoretic dispersion composition, and the optimum amount varies depending on the type of the charge controlling agent.

Viewing Direction The display surface of the electrophoretic display device of the present invention is a flexible substrate 1
One side or the elastic top plate 18 side can be used. When the substrate 11 is used as the display surface, the substrate 11 may be made transparent, and the top plate 18 may be mixed with a reflective material powder, or a reflection layer may be provided on the back of the top plate 18. When the top plate 18 is used as the display surface, the top plate 18 and the protective film 19 may be made transparent, the substrate 11 may be mixed with a reflective material powder, or a reflective layer may be provided on the back of the substrate 11. . Further, a light emitting layer may be provided instead of the reflective layer. As the reflective material powder, a white pigment powder such as titanium oxide, tin oxide, and aluminum oxide, or a metal powder may be used.

Manufacturing Method FIGS. 3A to 3G are sectional views showing an example of a method for manufacturing an electrophoretic display device of the present invention. The manufacturing process will be described with reference to FIG. (A) The first electrode 12 is formed on the flexible substrate 11. (B) An insulating layer 14 is formed on the first electrode, and a plurality of linear second electrodes 13 are provided on the first electrode at a predetermined interval in parallel with each other. (C) The insulating layer 14 is formed so as to cover the second electrode. (D) A plurality of flexible partition walls 15 are provided on this insulating layer so as to be parallel to each other and to be parallel to the second electrodes at the same pitch. (E) In a section surrounded by the flexible partition 15 and the insulating layer 14,
An electrophoretic dispersion liquid comprising an insulating dispersion medium, electrophoretic particles and a charge control agent is injected. It is preferable that the injection amount slightly exceeds the height of the flexible partition wall. Since the openings of the compartments are large and easy to inject, it is possible to inject the electrophoretic dispersion liquid having a uniform concentration of the electrophoretic particles into any compartment. (F) Spraying the solution containing the material of the elastic top plate from the upper part in the form of a mist using a spray device, and applying. As the spray device, for example, a droplet discharge technology (so-called ink jet technology) that can extremely control severely the droplet discharge amount and the position accuracy of the discharge destination such as a micro spray manufactured by Nordson or a bubble jet printer head manufactured by Canon Inc. is used. it can. The applied top plate material is solidified and stretchable top plate 1
8 is formed. The curing step is performed by heating or light irradiation depending on the material used. (G) Finally, the protective film 19 is applied on the elastic top plate.

The electrophoretic display device having the flexibility and the memory property has a film-like appearance. When this display device is bent, it has flexibility. This is because one surface (substrate) is made of a flexible material and the other surface (top plate) is made of a stretchable material. To compensate or absorb.
Regarding the memory performance of the display, the stress when the electrophoretic display device is bent is deformed and absorbed by the elastic material of the top plate, so that the flow of the insulating dispersion medium can be suppressed, and thus the internal migration particles can be suppressed. Is less likely to be swept away, and the display is maintained.

[0035]

Embodiments of the present invention will be described below. First Embodiment Preparation of electrophoretic particles 1 part of azobisisobutyronitrile was mixed and dissolved in 50 parts of styrene, and 20 parts of carbon black were further mixed to obtain a monomer solution. On the other hand, 1.5 parts of AEROSIL # 200 (manufactured by Nippon AEROSIL) was dissolved in 450 parts of deionized water, and the monomer solution was added thereto and stirred at 5000 rpm using a homogenizer to form an emulsion. Thereafter, the whole was heated to 80 ° C. and stirred for about 1 hour to carry out polymerization. Next, transfer the whole system to another container,
6 at 80 ° C. while stirring the propeller at 200 rpm.
The polymerization reaction was continued for hours. Thereafter, cooling, filtration and washing with water were repeated, and finally drying was performed to obtain black electrophoretic particles having an average particle size of 1.5 μm.

2. Preparation of electrophoretic dispersion liquid 5 parts of the above electrophoretic particles and 0.1 part of cobalt naphthenate were dispersed in 100 parts of Isopar G (manufactured by Exxon Chemical) and stirred for about 1 hour to prepare an electrophoretic dispersion liquid. When the surface zeta potential of the migrating particles was measured by an Otsuka Electronics zeta potential measuring device, the average was +100 mV.

3. Production of Electrophoretic Display Device A 100 μm-thick polycarbonate film on which an ITO electrode (first electrode) was formed (Eleclear H, manufactured by Teijin Co., Ltd.)
AB200) On a substrate, an acrylic resin was applied to form a 2 μm thick insulating layer (Optomer, manufactured by JSR). Next, a linear aluminum electrode (second electrode) having a width of 10 μm and a pitch of 100 μm was provided thereon. Acrylic resin (Optomer) on the aluminum electrode again
Was applied to form an insulating layer having a thickness of 2 μm.

On this insulating layer, an ultraviolet curable resin (THB, manufactured by JSR Corporation) made of an acrylic resin has a thickness of 30 μm.
, And exposed to a partition pattern using a photomask, developed to dissolve unnecessary portions, and dried to prepare partition walls. Then, in the space surrounded by the partition and the insulating layer, 2. Was injected.

Next, a mixed liquid of 70 parts of OBR (manufactured by Tokyo Ohka) and 30 parts of aluminum oxide fine particles containing cyclized isoprene rubber as a main component was uniformly applied from the upper part of the electrophoretic dispersion liquid by a micro spray device manufactured by Nordson. Then, the resultant was dried to form a top plate coating serving also as a reflection layer having a thickness of about 100 μm.
OBR is a liquid and 70 parts contains a solvent component. The electrophoretic dispersion liquid in the completed electrophoretic display device had a uniform electrophoretic particle concentration in the plane.

Subsequently, the electrophoretic display operation was confirmed.
When the first electrode was grounded and the potential of the second electrode was set to +100 V, the migrating particles spread apart on the second electrode, and when viewed from the polycarbonate film substrate side, black display was shown. Next, when the potential of the second electrode was set to -100 V, the migrating particles gathered on the narrow second electrode,
When observed from the polycarbonate film substrate side,
The reflected light of the aluminum oxide mixed with the OBR of the top plate was observed, and a white display was shown.

When the potential of the second electrode is 1 Hz,
When the voltage was alternately modulated to 100 V and -100 V, the display changed to black and white alternately in synchronization with the potential modulation. Subsequently, when no voltage was applied and the electrophoretic display device was bent, it had flexibility. In addition, the display was not disturbed by the bending, and the display was maintained.

Second Embodiment The first embodiment is similar to the first embodiment except that PMER (manufactured by Tokyo Ohka) made of novolak resin is used as the ultraviolet-curable resin for forming the partition walls.
The steps up to the injection of the electrophoretic dispersion liquid were performed by the same materials and operation as in the example. Next, a mixture of 60 parts of styrene isoprene block polymer, 40 parts of maleic ester and 1 part of benzoyl ether was uniformly applied by microspray (manufactured by Nordson) from the top of the electrophoresis dispersion liquid, and the whole was uniformly exposed to ultraviolet light. Then, the solvent was removed on a hot plate at 120 ° C. for several minutes (about 30 to 1 hour in an oven) to form a transparent top plate coating having a thickness of 100 μm. The electrophoretic dispersion liquid in the completed electrophoretic display device had a uniform electrophoretic particle concentration in the plane. It was confirmed that this electrophoretic display also operates in the same manner as in the first embodiment.

Third Embodiment As an insulating layer provided on an aluminum electrode, alumina particles and an acrylic resin (optomer) were used in a weight ratio of 100: 30.
The process up to the injection of the electrophoretic dispersion liquid was carried out by the same material and operation as in the second example, except that the mixture of the above was applied to form an insulating layer / reflection layer having a thickness of 2 μm.

Next, a mixed solution containing 65 parts of hydrogenated terminal polybutadiene, 35 parts of fumaric ester and 1 part of benzyl ketal was uniformly applied from the upper part of the electrophoretic dispersion liquid by a microspray device (manufactured by Nordson). Exposure was performed uniformly with ultraviolet light to form a transparent top plate film having a thickness of about 100 μm. The electrophoretic dispersion liquid in the completed electrophoretic display device had a uniform electrophoretic particle concentration in the plane.

Subsequently, the electrophoretic display operation was confirmed.
When the first electrode was grounded and the potential of the second electrode was set to +100 V, the migrating particles spread apart on the second electrode, and when viewed from the top, a black display was observed. Next, when the potential of the second electrode was set to -100 V, the migrating particles gathered on the narrow second electrode, and when observed from the top plate side, the reflected light of alumina mixed with the insulating layer was observed. And displayed white.

When the potential of the second electrode is 1 Hz,
When the voltage was alternately modulated to 100 V and -100 V, the display changed to black and white alternately in synchronization with the potential modulation. Subsequently, when no voltage was applied and the electrophoretic display device was bent, it had flexibility. In addition, the display was not disturbed by the bending, and the display was maintained.

[0047]

As described above, according to the method of manufacturing an electrophoretic display device of the present invention, it is easy to inject and seal the electrophoretic dispersion liquid into the display section. INDUSTRIAL APPLICABILITY The electrophoretic display device of the present invention is suitable for paper-like displays because it has flexibility corresponding to bending deformation and does not lose display memory even when deformed.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing one embodiment of an electrophoretic display device of the present invention.

FIG. 2 is a schematic sectional view showing another embodiment of the electrophoretic display device of the present invention.

FIG. 3 is an explanatory diagram of a manufacturing process of the electrophoretic display device of the present invention.

FIG. 4 is a schematic sectional view showing a conventional electrophoretic display device.

[Explanation of symbols]

11: flexible substrate, 12: first electrode, 13: second electrode,
14: insulating layer, 15: flexible partition, 16: migrating particles, 1
7: insulating dispersion medium, 18: elastic top plate, 19: protective film, 20: flexible support, 41: substrate, 42: first electrode, 43: second electrode, 45: partition, 46: electrophoresis Particles, 4
7: colored dispersion medium, 48: top plate.

Claims (3)

[Claims] 1. An electrophoretic display device which performs display by moving electrophoretic particles dispersed in an insulating liquid in accordance with the direction of an electric field, comprising: a support having flexibility; A top plate that can be stretched and shrunk against surface stress,
An electrophoretic display device comprising a migration liquid in which migration particles are dispersed in an insulating liquid, in a section formed by the support, the plurality of partitions, and the top plate. 2. A method for manufacturing an electrophoretic display device for performing display by moving electrophoretic particles dispersed in an insulating liquid in accordance with the direction of an electric field, wherein a plurality of partitions are formed on a flexible support. Providing, a step of injecting an electrophoretic dispersion liquid in which electrophoretic particles are dispersed in an insulating liquid into a section formed by the support and the plurality of partition walls; and both of the electrophoretic dispersion liquid and the partition wall injected into the section. A step of applying a liquid which is incompatible with the insulating liquid and is cured by light, heat, or drying, and a step of curing the applied liquid to form a top plate and sealing the liquid. A method for manufacturing an electrophoretic display device. 3. The method according to claim 2, wherein the application of the liquid is performed by spraying using a spray device.
The production method described in 1.