Method for manufacturing display element

The present invention relates to a method for manufacturing a display element for displaying by moving fine particles, and particularly to a method for forming a sealing layer for sealing a dispersion liquid composed of fine particles and a dispersion medium filled in voids formed on a substrate. ..

In recent years, a display element that reflects the distribution state of fine particles in a hollow portion in a display state has been proposed, and as an example of such a display element, charged electrophoretic particles, which are charged fine particles, are dispersed in an insulating liquid. , There is an electrophoresis display element that displays by applying an electric field to the electrophoretic particles to move the electrophoretic particles.

Here, when the charge electrophoretic particles are dispersed in the insulating liquid in this way, the charge electrophoretic particles are likely to be displaced in the in-plane direction of the substrate, and when the charge electrophoretic particles are displaced from a predetermined position in this way, the display image is displayed. It is necessary to limit the movable region of the charged electrophoretic particles because it induces deterioration of the charged migration particles.

Therefore, as one method of limiting the movable region of the charged migration particles in this way, a substrate, a partition wall provided on the substrate, a support layer arranged so as to sandwich the partition wall with the substrate, and at least a support layer A plurality of fine hollow portions are formed on the substrate by the sealing layer that continuously covers the surface on the substrate side and the side surface of the partition wall near the support layer, and the charged migration particles and the insulating liquid are confined in the hollow portions. There is a way. Then, if this confinement is perfect, the displacement region of the charged electrophoretic particles can be limited to the inside of this hollow portion.

Next, a method of manufacturing an electrophoresis display element having such a configuration will be described.

First, a partition wall is formed on the substrate by an etching method, an inkjet method, or an embossing method to form a divided cell. The etching method corresponds to the known photolithography method, and forms a partition wall by developing and rinsing the photosensitive coating film after mask exposure. Further, the inkjet method gradually deposits the partition wall material on the substrate and then cures the partition wall material to form a partition wall, and the embossing method forms a dent in the material by applying pressure to the flat plate-shaped material. At the same time, it forms a partition wall.

Next, after forming the partition wall in this way, each divided cell divided by the partition wall is filled with a mixture (hereinafter referred to as a dispersion system) composed of charge electrophoretic particles and an insulating liquid by an inkjet method. Then, after filling the dispersion system in this way, a sealing material is applied onto the dispersion system to cure the sealing material. As a result, the dispersed system is confined.

Next, the encapsulant thus cured and the substrate facing the partition wall forming substrate are bonded together to complete the electrophoresis display element. In addition, in the method of manufacturing such an electrophoresis display element, the sealing material is required not to be mixed with the dispersion system.

On the other hand, as another manufacturing method for manufacturing an electrophoresis display element, a mixture of a sealing material precursor having a smaller specific gravity than the dispersion system and not mixed with the dispersion system and the dispersion system is filled in a divided cell by an inkjet method. There is a way. In this method, after the partition wall is formed, the encapsulant precursor is separated from the dispersion system, and finally a state in which the encapsulant precursor is located above the dispersion system is formed.

Then, when such a state is formed, after that, the encapsulant precursor is cured by, for example, ultraviolet irradiation to form an encapsulating layer. As a result, a state in which the dispersion system is confined is formed. After that, the sealing layer and the substrate facing the partition wall forming substrate are bonded together to complete the electrophoresis display element (see, for example, Patent Document 1).

<patcit num="1"><text>Japanese Unexamined Patent Publication No. 2001-343672</text></patcit>

<p> However, the method for manufacturing the electrophoretic display element described in Patent Document 1 has the following two problems.</p><p> The first problem is that the selection range of the encapsulant is very small.</p><p> Here, there are roughly two causes for suppressing the selection width, and the first cause is due to the specific gravity limitation imposed on the sealing material. That is, in the conventional manufacturing method, the specific gravity of the encapsulant must be smaller than the specific gravity of the dispersion system. For example, when an isoparaffin-based solvent often used as a dispersion is used, the specific gravity of the encapsulant is required to be less than 1. However, the specific gravity of many curable materials is greater than 1, and it is very difficult to find a material less than 1.</p><p> The second cause is that the encapsulant must be cured in contact with the outside air, and therefore the encapsulant is required to be able to be cured even in the presence of oxygen. However, an ultraviolet curable resin (for example, an acrylate-based ultraviolet curable material) that can be an inexpensive and soft sealing film generally polymerizes in an anaerobic state. If anaerobic conditions are required, a special effect device is required to remove oxygen from the polymerization environment. Due to these causes, there is a problem that the selection width of the encapsulant is extremely limited.</p><p> The second problem is that it is difficult to evenly install the encapsulant over a wide area.</p><p> This is because non-uniformity occurs in the layer of the sealing material exposed to the outside air. One of the causes of non-uniformity is the phenomenon of droplet formation of the encapsulant. It is generally difficult to avoid the occurrence of these non-uniformities. This situation tends to become more pronounced as the element size increases.</p><p> Therefore, the present invention has been made in view of such a current situation, and there is no specific gravity limitation on the sealing layer precursor, an ultraviolet curable material can be used as the sealing layer precursor, and a uniform sealing layer can be used. It is an object of the present invention to provide a method for manufacturing an electrophoretic display element (display element) capable of forming the above.</p>

<p> In the present invention, a substrate, a plurality of partition walls provided on the substrate, a support layer arranged so as to sandwich the partition wall with the substrate, a surface of the support layer on the substrate side, and a partition wall side surface at least in the vicinity of the support layer. This is a method for manufacturing a display element that reflects the distribution state of fine particles in the hollow portion formed by the sealing layer that continuously covers the above, and is a gap formed by providing the partition wall on the substrate. A dispersion filling step of filling the dispersion liquid composed of the fine particles and the dispersion medium and a sealing layer precursor dissolved and / or dispersed in the dispersion liquid, and a support layer mounting step of placing the support layer on the partition wall. The sealing layer precursor is aggregated on the surface of the support layer in contact with the dispersion liquid and at least the side surface of the partition wall in the vicinity of the support layer, and the surface of the support layer and the side surface of the partition wall in the vicinity of at least the support layer are assembled. The sealing layer is formed by performing at least one of a coating step of continuously coating the sealing layer precursor with the sealing layer precursor and at least one of a polymerization treatment and a cross-linking treatment on the sealing layer precursor. It is characterized by having a process.</p>

<p> As in the present invention, a sealing layer precursor that continuously coats the surface of the support layer and at least the side surface of the partition wall in the vicinity of the support layer in the coating step is treated with at least one of a polymerization treatment and a crosslinking treatment in the sealing layer forming step. By forming the sealing layer by applying the above, there is no limitation on the specific gravity of the sealing layer precursor, the ultraviolet curable material can be used as the sealing layer precursor, and the sealing layer is uniform. Can be formed.</p>

Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing a schematic configuration of an electrophoresis display element according to an embodiment of the present invention. In the figure, 10 is a substrate, 90 is an insulating layer formed on the upper surface of the substrate 10, and 20 is on the substrate. It is a grid-like partition wall formed in. The shape of the grid-shaped partition wall 20 may be quadrangular or circular.

Reference numeral 30 denotes a support layer arranged on the display surface side of the electrophoresis display element while sandwiching the partition wall 20 with the substrate 10, and the space surrounded by the support layer 30, the substrate 10 and the partition wall 20 is hollow. It is a department. Then, the hollow portion is filled with a dispersion liquid composed of the dispersion medium 40 and the charge electrophoresis particles 50. Note that 70 is the first electrode and 80 is the second electrode.

Reference numeral 60 denotes a sealing layer, and the sealing layer 60 covers the entire inner wall of the hollow portion. In the present embodiment, the sealing layer 60 is also filled in the gap between the support layer 30 and the partition wall 20.

Here, this electrophoresis display element reflects the distribution state of the charge electrophoresis particles 50 in the display state, and in the region shown in (A) in the figure, the charge electrophoresis particles 50 are gathered on the partition wall 20 side. It shows the distribution state. Then, in such a state, when the region (A) is observed from the support layer 30 side, for example, if the color of the first electrode surface or the insulating layer 90 is white, it looks white. Further, for example, if the first electrode surface (or the insulating layer 90) is appropriately colored in red, green, blue, or the like, color display is possible.

On the other hand, in the region shown in (B) in the figure, the charged electrophoretic particles 50 show a distributed state dispersed in the in-plane direction of the substrate. Then, in such a state, when the region (B) is observed from the support layer 30 side, for example, if the color of the charge electrophoresis particle 50 is black, it looks black.

In order to change the display state, the charge electrophoresis particles 50 may be displaced on the substrate to change the distribution state of the charge electrophoresis particles 50. For example, by applying an electric signal between the first electrode 70 and the second electrode 80, the charged electrophoretic particles 50 can be driven and displaced by the electrophoretic force. The method of displacing the charged electrophoretic particles 50 is not particularly limited, and may be displaced by using, for example, a dielectrophoretic force or an electrohydrodynamic flow of a dispersion medium. Further, the color of the fine particles can be appropriately colored other than black.

By the way, in the present embodiment, the sealing layer 60 is formed by dissolving the sealing layer precursor in the dispersion liquid and curing the sealing layer precursor.

Next, the method of forming the sealing layer according to the present embodiment will be described with reference to the process diagram shown in FIG.

&lt;Step 1&gt; Step 1 is a step of filling the voids formed by the substrate 10 and the partition wall 20 with a dispersion liquid in which the sealing layer precursor is dissolved (and / or dispersed).

In step 1, which is the dispersion liquid filling step, first, a switching element (not shown), a first electrode 70, and an insulating layer 90 are formed on the substrate 10 by using, for example, a known photolithography method, and then an insulating layer is formed. A second electrode 80 and a partition wall 20 are formed on the 90.

Here, the partition wall 20 is formed by, for example, a known lithography method. At this time, the surface of the partition wall 20 may be subjected to a treatment for promoting the adsorption of the sealing layer precursor in step 3 described later. For example, when the sealing layer precursor is an amphipathic material, if the partition wall surface is subjected to a hydrophobic treatment, the hydrophobic portion of the amphipathic material is likely to be adsorbed on the hydrophobic portion of the partition wall 20. Further, a residue capable of binding to the sealing layer precursor may be immobilized on the surface of the partition wall. The sealing layer precursor does not necessarily have to be dissolved in the dispersion medium in the dispersion liquid, and any one having dispersibility can be used.

Then, after the partition wall 20 is formed in this way, the charge electrophoresis particles 50 and the sealing layer precursor are dissolved (or dispersed) in the voids formed by the substrate 10 and the partition wall 20 as shown in FIG. 2 (a). Fill with the dispersion liquid 200.

&lt;Step 2&gt; Step 2 is a step of placing the support layer 30 on the partition wall 20, and in step 2 of this support layer mounting step, after filling the voids with the dispersion liquid 200, FIG. As shown in (b), the support layer (material) 30 is placed on the partition wall 20.

The surface of the support layer 30 may be subjected to a treatment for promoting the adsorption of the sealing layer precursor in step 3 described later. For example, when the sealing layer precursor is an amphipathic material, if the surface of the support layer is subjected to a hydrophobic treatment, the hydrophobic portion of the amphipathic material is easily adsorbed on the hydrophobic portion of the support layer 30. Further, an organic molecule capable of binding to the sealing layer precursor may be immobilized on the surface of the support layer.

Further, organic molecules capable of binding to the sealing layer precursor may be immobilized on at least one of the support layer 30 and at least the side surface of the partition wall in the vicinity of the support layer. In this case, it is effective when the chemical adsorption phenomenon described later is used.

There are chemical (covalent bond, etc.) and physical (non-covalent bond, etc.) methods for immobilizing this organic molecule on at least one of the support layer 30 and at least the side surface of the partition wall near the support layer. Although not particularly limited, in the present invention, immobilization by a chemical method is more preferable. Further, a reactive functional group obtained at least one of the support layer 30 and at least the side surface of the partition wall in the vicinity of the support layer by an oxidation treatment such as UV ashing may be used to bond with the sealing layer precursor.

&lt;Step 3&gt; In Step 3, the encapsulating layer precursor dissolved (or dispersed) in the dispersion liquid 200 is aggregated (precipitated) by adsorbing it on the support layer 30, the partition wall 20, and the insulating layer 90, and these 3 This is a step of continuously coating the surface of the person with the sealing layer precursor. In step 3, which is the coating step, the support layer 30, the partition wall 20, and the partition wall 20 are in contact with the dispersion liquid 200 in which the sealing layer precursor is dissolved. The sealing layer precursor is adsorbed on the surface of the insulating layer 90 due to its affinity. As a result, as shown in (c) of FIG. 2, a state in which the surfaces of these three parties are continuously covered with the sealing layer precursor 210 in which the surfaces are aggregated (precipitated) is formed. In the present embodiment, the sealing layer precursor 210 is also filled in the voids sandwiched between the support layer 30 and the partition wall 20.

&lt;Step 4&gt; Step 4 is a step of immobilizing the sealing layer precursor 210 to form the sealing layer 60, and in step 4 which is such a sealing layer forming step, sealing is performed. As a result of immobilizing the stop layer precursor 210, the sealing layer 60 shown in FIG. 1 is formed.

The method of immobilization treatment depends on the properties of the sealing layer precursor. For example, when the sealing layer precursor 210 is composed of a polymerizable compound, a polymerization treatment according to the properties of the polymerizable compound may be performed as an immobilization treatment, and the sealing layer precursor made of a photopolymerizable compound may be applied. When compound 210 is used, it may be subjected to photopolymerization treatment. Further, when the sealing layer precursor 210 contains a structure capable of being polymerized by ultraviolet rays, a cross-linking treatment by irradiation with ultraviolet rays is performed.

The step of forming the sealing layer 30 by the polymerization treatment and / or the cross-linking treatment on the sealing layer precursor 210 in the present invention includes the polymerization treatment and / or the cross-linking treatment between the sealing layer precursors and the sealing. This is a step of forming the sealing layer 60 by a polymerization treatment and / or a cross-linking treatment on at least one of the layer precursor 210, the support layer 30, and at least the side surface of the partition wall in the vicinity of the support layer.

Next, a material or the like for forming the electrophoresis display element according to the present embodiment will be described.

The dispersion medium 40 is an insulating fluid, and examples thereof include isoparaffin (for example, a fluid whose trade name is Isopar manufactured by Exxon), silicone oil, and organic solvents such as xylene and toluene.

The charged electrophoretic particles 50 are not particularly limited in material, particle size, particle color, etc. as long as they can be displayed as desired, but they are colored and have good positive or negative electrode characteristics in an insulating liquid. The material showing is preferable. For example, various inorganic pigments, organic pigments, carbon black, or resins containing them may be used. The average particle size of the particles can usually be about 0.01 to 50 μm, but preferably about 0.1 to 10 μm.

A charge control agent for controlling and stabilizing the charge of the charge electrophoresis particles 50 may be added to the insulating liquid or the charge electrophoresis particles. Here, examples of such a charge control agent include succinic acid imide, a metal complex salt of a monoazo dye, salicylic acid, an organic quaternary ammonium salt, and a niglosin-based compound.

The substrate 10 is not particularly limited, and for example, a soft substrate such as polyether sulfone (PES), polyethylene terephthalate (PET) or polycarbonate (PC), or a hard substrate such as glass or quartz can be used. When the sealing layer precursor is photopolymerizable as described later, the substrate on the side irradiated with the light for polymerization (for example, the support layer) needs to have transparency to the light for polymerization. There is.

The first and second electrodes 70 and 80 are not significantly limited as long as the desired display can be realized, and examples of the electrode material include Al electrodes and ITO electrodes. When the first electrode 70 is also used as a light reflecting layer, a material having a high light reflectance such as silver (Ag) or Al is preferably used. When the first electrode 70 is used as a white display, the surface of the electrode itself is unevenly reflected so that light is diffusely reflected, or a light scattering layer is formed on the electrode.

The electrode arrangement is not particularly limited as long as it can induce the desired displacement of the charged electrophoretic particles required for the change in the display state. For example, in FIG. 1, the electrodes are arranged on the substrate 10 side so as to displace the charge electrophoresis particles 50 significantly in the in-plane direction of the sealing layer (film) 60, but the charge electrophoresis particles 50 are arranged in the normal direction of the substrate 10. Electrodes may be provided on the substrate 10 and the support layer 30 so as to cause a large displacement.

Next, the characteristic sealing layer precursor of the present invention will be described.

The sealing layer precursor according to the present embodiment may be liquid or solid as long as it can form the desired sealing layer 60, but is soluble in the dispersion medium 40, that is, has solubility in the dispersion medium 40. For example, a small molecule is used. Here, by using a sealing layer precursor having solubility in the dispersion medium 40 in this way, the limitation of the specific gravity of the sealing layer precursor, that is, the limitation of the specific gravity of 1 or less is removed. This makes it possible to increase the types of materials that can be used as the sealing layer precursor. The sealing layer precursor can be applied not only as a precursor that dissolves in a dispersion medium but also as a precursor that disperses as fine droplets.

Further, in this sealing layer precursor, when the dispersion medium 40 in which the sealing layer precursor is dissolved comes into contact with the partition wall 20, the support layer 30, etc., the sealing layer precursor is at least on the surface of the support layer 30 and the partition wall 20. Use one that has an affinity so that it can be adsorbed to the region on the side surface near the support layer. Here, by allowing the sealing layer precursor to be adsorbed on the surface of the support layer 30 and at least the region on the side surface near the support layer of the partition wall 20, the sealing layer precursor is the dispersion medium 40 and the support layer 30. And it exists at the interface of the partition wall 20, that is, it exists in an anaerobic state. And, by being in an anaerobic state in this way, it becomes possible to use many ultraviolet curable materials. Furthermore, since the adsorption phenomenon from the dispersion medium 40 is used, it is possible to form a uniform layer of the sealing layer precursor.

Furthermore, it is desirable that the sealing layer precursor has a small affinity with the charged electrophoretic particles 50.

An amphipathic material composed of a hydrophilic unit and a hydrophobic unit can be given as an example of a material that can be used as such a sealing layer precursor. Here, the amphipathic material can control the solubility in the dispersion medium 40 and the adsorptivity to the support layer or the like by adjusting the molecular structure, molecular weight, etc. of each unit.

As one group of such amphipathic materials, a triblock type copolymer can be mentioned. Here, this triblock-type copolymer is linked in the order of hydrophilic unit-hydrophobic unit-hydrophilic unit, or in the order of hydrophobic unit-hydrophobic unit-hydrophobic unit. It is a coalescence.

As an example of the former, a material in which PEO (polyethylene oxide) and PPO (polypropylene) are connected in the order of PEO-PPO-PEO can be mentioned, and an example of the latter is PPO-PEO-PPO. You can list the materials that are connected in order.

Then, the solubility and adsorptivity of these copolymers can be controlled by the length (that is, the molecular weight) of the PEO unit and the PPO unit. Further, a material in which a photopolymerizing group is bonded to an amphipathic unit can also be used as a sealing layer precursor. Examples of the photopolymerizing group include acrylate and maleimide. Further, the sealing layer precursor may be a mixture of one or more materials.

Further, it is desirable that the sealing layer precursor has a structure that can be polymerized or crosslinked. This is because the encapsulation of the charged electrophoretic particles 50 becomes more reliable by solidifying the sealing layer precursor by the polymerization treatment or the cross-linking treatment. It is preferable that such a sealing layer precursor is subjected to a curing treatment after forming a predetermined coating state on the support layer or the like. This is because the hardening treatment increases the mechanical strength of the sealing layer and further improves the adhesiveness between the sealing layer and the partition wall.

It should be noted that a polymerizable substituent (for example, a vinyl group, a methacryl group, an acrylic group, a maleimide group, etc.) or a chemically reactive substituent (for example, a hydroxyl group, a carboxylic acid, an amino group, an isocia) is added to the unit exhibiting amphotericity. A material to which a nalto group, a halogen group, a vinyl group, an epoxy group, a carbonyl halide group, etc. are bonded can also be used as a sealing layer precursor in the present invention.

Here, the curing method may be selected according to the structure in which the sealing layer precursor can be polymerized or crosslinked. For example, when the sealing layer precursor contains an ultraviolet-polymerizable structure typified by an acrylate group or a maleimide group, ultraviolet polymerization can be selected as the curing method.

Further, when the above-mentioned copolymer having a PEO-PPO-PEO structure is used as a sealing layer precursor, a cross-linking material for cross-linking this copolymer may be added as a constituent component of the precursor. As a cross-linking material, a dicumyl peroxide can be mentioned. Alternatively, it is also possible to use a cross-linking material having a group (for example, isocyanate) capable of binding to the hydroxyl group of the copolymer.

Further, an organic molecule having a structure capable of binding to the sealing layer precursor may be immobilized on the side surface of the support layer 30 or the partition wall 20 at least in the vicinity of the support layer. For example, a molecule having an isocyanate group may be immobilized on the surface of a support layer or the like and bonded to a copolymer having a PEO-PPO-PEO structure adsorbed on the substrate. Up to now, the ultraviolet curable resin has been described as an example of the sealing layer precursor, but other polymerizable compounds can also be used.

By the way, the adsorption phenomenon in the present invention includes a physical adsorption phenomenon and a chemical adsorption phenomenon. Here, in the physical adsorption phenomenon, at least one of the support layer 30 and at least the side surface of the partition wall near the support layer and the sealing layer precursor are non-covalent bonds (ionic bond, coordination bond, hydrophilic-hydrophobic bond, It is a phenomenon of bonding by hydrogen bond, acid-base bond, etc.). In this case, it is preferable that at least one of the support layer 30 and at least the side surface of the partition wall in the vicinity of the support layer has an affinity for the sealing layer precursor to promote adsorption.

On the other hand, the chemical adsorption phenomenon is a phenomenon in which the sealing layer precursor chemically reacts with at least one of the support layer 30 and at least the side surface of the partition wall in the vicinity of the support layer to form a covalent bond. In this method, it is considered that adsorption is promoted by the distribution concentration gradient of the sealing layer precursor in the hollow portion.

As a form of forming this covalent bond, a method in which the sealing layer precursor has at least two or more reactive substituents and chemically reacts with at least one of the support layer 30 and at least the side surface of the partition wall in the vicinity of the support layer. Alternatively, a method in which a polymerization initiating group is present on at least one of the hollow portion-side surfaces of the support layer 30 and at least the side surface of the partition wall in the vicinity of the support layer, and the sealing layer precursor is polymerized and chemically reacted with the polymerization initiating group as a starting point. Can be mentioned.

Here, in the former, the sealing layer precursor may be a polymer or a low molecule, and in the latter, it is desirable that the sealing layer precursor is a low molecule or an oligomer. Further, in the former case, a polymerization treatment and / or a cross-linking treatment between the sealing layer precursors, a hollow portion side surface of at least one of the sealing layer precursor, the support layer 30 and at least the partition wall side surface in the vicinity of the support layer is provided. The permutation of fixation with is not particularly limited. As the adsorption phenomenon, physical adsorption and chemical adsorption may be used respectively, or both may be used at the same time.

In the present invention, a monomer can be used when the sealing layer precursor is polymerized to form a sealing film. This monomer may be a monomer generally used for polymer polymerization as long as it is soluble in a dispersion medium, and is not particularly limited. Specifically, various vinyl-based monomers, that is, styrene, 2-methylstyrene, 3-methylstyrene, 4-methylstyrene, 2-ethylstyrene, 3-ethylstyrene, 4-ethylstyrene, 2-propylstyrene, 3-propyl styrene, 4-propyl styrene, 2-isopropyl styrene, 3-isopropyl styrene, 4-isopropyl styrene, 4-tert-butyl styrene, 2,3-dimethyl styrene, 3, 4-dimethyl styrene, 2, 4- Dimethylstyrene, 2,6-dimethylstyrene, 2,3-diethylstyrene, 3,4-diethylstyrene, 2,4-diethylstyrene, 2,6-diethylstyrene, 2-methyl-3-ethylstyrene, 2-methyl Styrene-based monomers such as -4-ethylstyrene, α-methylstyrene, 4-phenylstyrene, acetoxystyrene, methoxystyrene, ethoxystyrene, butoxystyrene, methyl (meth) acrylate, ethyl (meth) acrylate, (meth) (Meta) acrylate-based monomers such as propyl acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, vinyl ether-based monomers such as vinyl methyl ether, vinyl ethyl ether, vinyl isobutyl ether, vinyl methyl ketone, vinyl Vinyl styrene-based monomers such as ethyl ketone and vinyl hexyl ketone, N-vinyl compound-based monomers such as N-vinylpyrrole, N-vinylcarbazole, N-vinylindole, and N-vinylpyrrolidone, and vinyl hydrocarbons such as ethylene, butylene, and hexene. Examples thereof include monomers, vinyl acetate, (meth) acrylonitrile, (meth) acrylamide, and halogenated monomers of the above-mentioned monomers. In addition, ethyl 2- (vinyloxy) ethoxyacetate and 2- (tert-butyldimethylsiloxy) ethyl vinyl acetate Monomers such as tell, 2- (trimethylsiloxy) ethyl vinyl ether, 2-vinyloxyethyl phthalamide and the like can also be used. The above-mentioned monomers may be used alone or in combination of two or more.

Further, a cross-linking agent may be used in combination as needed, and by using the cross-linking agent in combination in this way, a stronger sealing layer can be formed. Here, specific examples of the cross-linking agent include divinylbenzene, divinylnaphthalene, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, and tetraethylene glycol di (meth) acrylate. Trimethylolpropane triacrylate, allyl (meth) acrylate, 1,3-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, hexanediol diglycidyl ether (meth) acrylate, N, N- Examples thereof include compounds such as divinylaniline, divinyl ether, and dicumylperoxide, and these may be used alone or in combination of two or more.

Therefore, it may be a polymer composed of a single monomer, a block polymer composed of a plurality of types of monomers and having a plurality of types of repeating structures, or a random polymer having no repeating structure. It should be noted that these monomers may be used to control the physical characteristics and chemical characteristics of the pixel surface on the entire pixel to control the display characteristics, display stability, and memory properties of the display device. Further, the sealing layer precursor according to the present invention may be a mixture of one or more kinds of materials.

Next, an organic molecule capable of binding to a sealing layer precursor present in at least one of the support layer 30 and at least the side surface of the partition wall near the support layer will be described.

As described above, this organic molecule is formed by a method in which at least one of the support layer 30 and at least the side surface of the partition wall near the support layer and the organic molecule are chemically (covalently bonded, etc.) or physically (non-covalently bonded, etc.). , At least one of the support layer 30 and at least the side surface of the partition wall near the support layer. Immobilization by a chemical method is preferable. Therefore, it is essential that at least one of the support layer 30 and at least the side surface of the partition wall in the vicinity of the support layer has a reactive functional group in each of the organic molecules, and that these reactive functional groups react with each other. Become.

Here, the reactive functional group may be any chemically reactive substituent, and is not particularly limited, but is preferably a hydroxyl group, a carboxylic acid, an amino group, an isocyanato group, a halogen group, or a vinyl group. , Epoxy group, carbonyl halide group and the like. From these, reactive functional groups are appropriately selected so as to react with each other. The material of at least one of the support layer 30 and at least the side surface of the partition wall in the vicinity of the support layer is not particularly limited, but when there is no reactive functional group such as metal, a substance having a reactive functional group is used as the intermediate layer. It may be covered. Further, a reactive functional group may be formed on at least one of the support layer 30 and at least the side surface of the partition wall in the vicinity of the support layer by an oxidation treatment such as UV ashing.

In addition, it is necessary that the organic molecule and the sealing layer precursor are bonded by a chemical (covalent bond or the like) or physical (non-covalent bond or the like) method. Bonding by a chemical method is preferable. Therefore, it is essential that each of the sealing layer precursor and the inside of the organic molecule has a reactive functional group, and that these reactive functional groups react with each other. The reactive functional group may be any chemically reactive substituent, and is not particularly limited, but is preferably a hydroxyl group, a carboxylic acid, an amino group, an isocyanato group, a halogen group, a vinyl group, or an epoxy group. , Hadenized carbonyl group, vinyl group and the like. From these, reactive functional groups are appropriately selected so as to react with each other.

Further, by introducing a vinyl group or a polymerization initiation group into the organic molecule, the sealing film is immobilized on the support layer 30 or the side surface of the partition wall near the support layer while polymerizing the sealing layer precursor to form the sealing film. can do. The polymerization initiator used at this time may be a substituent having the skeleton of a known polymerization initiator generally used for radical polymerization, living radical polymerization, living cationic polymerization, living anionic polymerization and the like.

Next, an example of this embodiment will be described.

(Example 1) In this example, an electrophoresis display element as shown in FIG. 1 was manufactured. Here, the size of one pixel of the produced electrophoresis display element is 100 μm × 100 μm, and each pixel is surrounded by a partition wall 20. The partition wall 20 has a grid pattern, a width of 8 μm, and a height of 20 μm. Further, the first electrode 70 is located in the central portion of the portion surrounded by the partition wall 20 and is connected to a switching element (not shown). The second electrode 80 is located between the partition wall 20 and the substrate 10, and is a common electrode for all pixels.

Next, a method of manufacturing the electrophoresis display element according to this embodiment will be described.

First, a switching element (not shown), a first electrode 70, and an insulating layer 90 are formed on the substrate 10 using a known photolithography method, and then a second electrode 80 is formed on the insulating layer 90, and then the partition wall 20 is formed. , For example, formed by a known lithography method. Then, after the partition wall 20 is formed in this way, the voids formed by the substrate 10 and the partition wall 20 are filled with a dispersion liquid 200 composed of a charge electrophoresis particle 50 in which the sealing layer precursor is dissolved and a dispersion medium. (See (a) in Figure 2).

In this example, isoparaffin (trade name: Isopar, specific gravity 0.76, manufactured by Exxon) containing the charge control agent imide succinate (trade name: OLOA1200, manufactured by Chevron) was used as the dispersion medium. As 50, polymer beads made of polystyrene-polymethylmethacrylate copolymer resin containing carbon black having an average particle size of about 1 to 2 μm were used.

The precursor of the sealing layer includes 95 parts by weight of a triblock copolymer having a PEO-PPO-PEO structure (trade name: Pluronic PE 6100, manufactured by BASF Japan Ltd., specific gravity: 1 or more) and 5 parts by weight of dicumyl peroxide. Was used. The concentration of Pluronic PE 6100 constituting the sealing layer precursor is 1.5 mol / liter.

Next, after filling the voids with the dispersion liquid 200 in this way, a PET film having a thickness of 30 μm constituting the support layer 30 was placed on the partition wall (see (b) in FIG. 2). After that, the PET substrate was allowed to stand on the partition wall 20 for 1 hour. As a result, the sealing layer precursor is adsorbed on the surfaces of the support layer 30, the partition wall 20, and the insulating layer 90, and the surfaces of these three are covered with the sealing layer precursor 210 (FIG. 6). See 2 (c)).

After this, the strength is 30 mW / cm at room temperature.²The sealing layer precursor was crosslinked by irradiating with the ultraviolet rays of the above for 10 minutes. As a result, the sealing layer precursor was cured to form the sealing layer 60 (see FIG. 1).

Here, after that, when the electrophoretic display element after UV irradiation was disassembled and observed with an electron microscope, the PET surface as a support layer, the partition wall surface, between the PET and the partition wall 20, and on the insulating layer of the substrate 10. It was confirmed that a uniform sealing layer 60 was formed on the surface.

Further, the first electrode 70 of the electrophoresis display element thus obtained was grounded, and the potential of the second electrode 80 was alternately modulated at + 15V and -15V at 1 hertz (Hz). As a result, the display changed alternately in black and white in synchronization with the modulation of the potential. Then, even if such driving was continuously performed, it was not observed that the charged electrophoretic particles were displaced beyond the partition wall 20.

At the same time, the dispersion medium did not volatilize. That is, it was confirmed that the dispersion liquid was confined by the partition wall 20 and the substrate 10. Further, although the obtained electrophoresis display element was bent back and forth, the phenomenon that the charge electrophoresis particles 50 were displaced beyond the partition wall 20 was not observed.

(Example 2) The manufacturing process of the electrophoresis display element in this example is the same as in Example 1 until the partition wall is formed, but in this example, an isocyanate group is formed on the surface of the partition wall 20 and the insulating layer 90 at the end. (Product name: KBE-9007, manufactured by Shin-Etsu Chemical Co., Ltd.) was immobilized according to a known method for immobilizing a silane coupling agent.

Next, in this embodiment, the voids formed by the substrate 10 and the partition wall 20 are filled with a dispersion liquid 200 composed of charge electrophoretic particles in which the sealing layer precursor is dissolved and a dispersion medium (see (a) in FIG. 2). .. In this example, isoparaffin (trade name: Isopar, specific gravity 0.76, manufactured by Exxon) containing the charge control agent imide succinate (trade name: OLOA1200, manufactured by Chevron) was used as the dispersion medium. As a result, polymer beads made of polystyrene-polymethylmethacrylate copolymer resin containing carbon black having an average particle size of about 1 to 2 μm were used.

Moreover, only a triblock type copolymer having a PEO-PPO-PEO structure (trade name: Pluronic PE 6100, manufactured by BASF Japan Ltd., specific gravity: 1 or more) was used as the precursor of the sealing layer. The concentration of Pluronic PE 6100 constituting the sealing layer precursor is 1 mol / liter.

Next, after filling the voids with the dispersion liquid 200 in which such a sealing layer precursor was dissolved, a surface-modified PET film having a thickness of 30 μm constituting the support layer 30 was placed on the partition wall 20 ( See (b) in Figure 2). A silane coupling agent (trade name: KBE-9007, manufactured by Shin-Etsu Chemical Co., Ltd.) having an isocyanate group at the end is immobilized on the surface of this PET film.

After this, the PET substrate was allowed to stand on the partition wall for 30 minutes. In this standing process, the isocyanate group on the PET surface reacts with the hydroxyl group of the copolymer, and as a result, the copolymer is immobilized on the support layer 30, the partition wall 20, and the insulating layer 90, and the sealing layer 60 is formed. Formed (see Figure 1).

When such an electrophoresis display element was disassembled and observed with an electron microscope, it was uniformly sealed on the PET surface as a support layer, the partition wall surface, between the PET and the partition wall 20, and on the insulating layer of the substrate 10. It was confirmed that layer 60 was formed.

By the way, the first electrode 70 of the electrophoresis display element thus obtained was grounded, and the potential of the second electrode 80 was alternately modulated at + 15V and -15V at 1 hertz (Hz). As a result, the display changed alternately in black and white in synchronization with the modulation of the potential. Even if such driving was continuously performed, it was not observed that the charged electrophoretic particles were displaced beyond the partition wall 20.

At the same time, the dispersion medium did not volatilize. That is, it was confirmed that the dispersion liquid was confined by the partition wall 20 and the substrate 10. Further, although the obtained electrophoretic display element was bent back and forth, the phenomenon that the electrophoretic particles were displaced beyond the partition wall 20 was not observed.

(Example 3) The manufacturing process of the electrophoresis display element in this example is the same as in Example 1 until the partition wall is formed. In this example, the substrate 10 and the partition wall 20 are formed after the partition wall 20 is formed. The voids are filled with a dispersion liquid 200 composed of charge electrophoretic particles in which the sealing layer precursor is dissolved and a dispersion medium (see (a) in FIG. 2). In this example, isoparaffin (trade name: Isopar, specific gravity 0.76, manufactured by Exxon) containing the charge control agent imide succinate (trade name: OLOA1200, manufactured by Chevron) was used as the dispersion medium. As a result, polymer beads made of polystyrene-polymethylmethacrylate copolymer resin containing carbon black having an average particle size of about 1 to 2 μm were used.

Further, as the sealing layer precursor, 1H, 1H, 5H-octafluoropentyl acrylate (for example, V-8F manufactured by Osaka Organic Chemical Industry Co., Ltd., specific gravity 1 or more), which is an ultraviolet curable material, was used. A photopolymerization initiator (Irgacure 184, manufactured by Ciba Geigy Co., Ltd.) is added to such an ultraviolet curable material (addition concentration = 3 wt%).

Next, after filling the voids with the dispersion liquid 200 in which such a sealing layer precursor is dissolved, a UV / ozone-treated PET film having a thickness of 30 μm constituting the support layer 30 is placed on the partition wall 20. (See (b) in Fig. 2).

After that, the PET substrate was allowed to stand on the partition wall for 1 hour, and then the strength was 30 mW / cm at room temperature.²The sealing layer precursor was crosslinked by irradiating with the ultraviolet rays of the above for 3 minutes. As a result, the sealing layer precursor was cured to form the sealing layer 60 (see FIG. 1).

When the electrophoresis display element after UV irradiation was disassembled and observed with an electron microscope, a uniform sealing layer 60 was formed between the PET surface as the support layer, the partition wall surface, and the PET and the partition wall 20. The thing was confirmed.

By the way, the first electrode 70 of the electrophoresis display element thus obtained was grounded, and the potential of the second electrode 80 was alternately modulated at + 15V and -15V at 1 hertz (Hz). As a result, the display changed alternately in black and white in synchronization with the modulation of the potential. Even if such driving was continuously performed, it was not observed that the charged electrophoretic particles were displaced beyond the partition wall 20.

At the same time, the dispersion medium did not volatilize. That is, it was confirmed that the dispersion liquid was confined by the partition wall 20 and the substrate 10. Further, although the obtained electrophoretic display element was bent back and forth, the phenomenon that the electrophoretic particles were displaced beyond the partition wall was not observed.

(Example 4) The manufacturing process of the electrophoresis display device in this example is the same as that in Example 3 except that the sealing layer precursor is changed. In this example, a maleimide group is used as a precursor of the sealing layer in a triblock copolymer having a PEO-PPO-PEO structure (trade name: L61, manufactured by Asahi Denka Kogyo Co., Ltd., specific gravity: 1 or more) by a known method. The combined one was used. The hydroxyl group of L61 was used for the bond between L61 and the maleimide group. In this example, unlike Example 3, a photopolymerization initiator is not used. This is because the maleimide contained in the sealing layer precursor of this example can allow the photopolymerization reaction to proceed without the photopolymerization initiator.

Next, after filling the voids with the dispersion liquid 200 in which such a sealing layer precursor is dissolved, a UV / ozone-treated PET film having a thickness of 30 μm constituting the support layer 30 is placed on the partition wall 20. (See Fig. 2 (b)).

After that, the PET substrate was allowed to stand on the partition wall for 1 hour, and then the strength was 30 mW / cm at room temperature.²The sealing layer precursor was crosslinked by irradiating with the ultraviolet rays of the above for 3 minutes. As a result, the sealing layer precursor was cured to form the sealing layer 60. Figure 1 schematically shows this situation. When the electrophoresis display element after UV irradiation was disassembled and observed with an electron microscope, a uniform sealing layer 60 was formed on the PET surface as a support layer, the partition wall surface, and between the PET and the partition wall. Was confirmed.

Further, the first electrode 70 of the electrophoresis display element (not subjected to the above decomposition treatment) thus obtained is grounded, and the potential of the second electrode 80 is set to + 15 V,-at 1 hertz (Hz). Modulated alternately with 15V. As a result, the display changed alternately in black and white in synchronization with the modulation of the potential. Then, even if such driving was continuously performed, it was not observed that the charged electrophoretic particles were displaced beyond the partition wall 20. At the same time, the dispersion medium did not volatilize. That is, it was confirmed that the dispersion liquid was confined by the partition wall 20 and the substrate 10. Further, although the obtained electrophoresis display element was bent back and forth, the phenomenon that the charge electrophoresis particles 50 were displaced beyond the partition wall 20 was not observed.

(Example 5) The manufacturing process of the electrophoresis display element in this example is the same as that in Example 1 until the partition wall is formed. In this embodiment, a silane coupling agent (3-methacryloxypropylmethyldimethoxysilane, trade name: KBE-502, Shin-Etsu Chemical Co., Ltd.) having a methacryl group on the surfaces of the partition wall 20 and the insulating layer 90 that have been subjected to UV ashing treatment. Was immobilized according to a known method for immobilizing a silane coupling agent.

Next, in this embodiment, the voids formed by the substrate 10 and the partition wall 20 are filled with a dispersion liquid 200 composed of charge electrophoretic particles in which the sealing layer precursor is dissolved and a dispersion medium (see FIG. 2 (a)). In this example, isoparaffin (trade name: Isopar, specific gravity 0.76, manufactured by Exxon Corporation) containing the charge control agent imide succinate (trade name: OLOA1200, manufactured by Chevron Corporation) was used as the dispersion medium.

Further, as the charge migration particles, polymer beads made of a polystyrene-polymethylmethacrylate copolymer resin containing carbon black having an average particle size of about 1 to 2 μm are used. The precursors of the sealing layer include 95 parts by weight of lauryl methacrylate (manufactured by Kishida Chemical Co., Ltd.) and di (3,5,5-trimethylhexanoyl) peroxide (trade name: Parloyl 355, manufactured by NOF Corporation) 5 The weight part was used. The concentration of this sealing layer precursor is 20 g / L.

Next, after filling the voids with the dispersion liquid 200 in which such a sealing layer precursor is dissolved, the surface of the support layer 30 on the side in contact with the dispersion liquid has the above-mentioned methacryl group. A 30 μm-thick PET film surface-treated with the agent was placed on the partition wall 20 (see FIG. 2 (b)).

After this, the PET substrate was allowed to stand on the partition wall at 70 ° C. for 4 hours. In this standing process, the methacrylic group on the PET surface and the methacrylic group of the precursor are polymerized. As a result, the copolymer was immobilized on the support layer 30, the partition wall 20, and the insulating layer 90, and the sealing layer 60 was formed. Figure 1 schematically shows this situation. When such an electrophoresis display element is disassembled and observed with an electron microscope, a uniform sealing layer is observed on the PET surface as a support layer, the partition wall surface, between the PET and the partition wall 20, and on the insulating layer of the substrate 10. It was confirmed that 60 was formed.

By the way, the first electrode 70 of the electrophoresis display element (not subjected to the above decomposition treatment) thus obtained is grounded, and the potential of the second electrode 80 is + 15 V,-at 1 hertz (Hz). Modulated alternately with 15V. As a result, the display changes alternately in black and white in synchronization with the modulation of the electric potential, and even if such driving is continuously performed, the charge electrophoretic particle 50 is displaced beyond the partition wall 20. Not observed. At the same time, the dispersion medium did not volatilize. That is, it was confirmed that the dispersion liquid was confined by the partition wall 20 and the substrate 10. Further, even if the obtained electrophoresis display element was bent back and forth, the phenomenon that the charge electrophoresis particles were displaced beyond the partition wall 20 was not observed.

(Example 6) The manufacturing process of the electrophoresis display element in this example is the same as that in Example 1 until the partition wall is formed. In this embodiment, hexamethylene diisocyanate is spin-coated on the surfaces of the UV-ashed partition wall 20 and the insulating layer 90 to form the partition wall 20 and the insulating layer 90 having an isocyanate group on the surface.

Next, a partition wall 20 having a polymerization initiating group and an insulating layer 90 can be formed on the surface by spin-coating a toluene solution in which 10% by weight of azobiscyanovaleric acid and 0.1% by weight of α-picoline are dissolved. Further, the same steps as these are performed on the surface of the UV ashing-treated 30 μm-thick PET film on the side in contact with the dispersion liquid to prepare a PET film having a polymerization initiation group on the surface.

Next, the voids formed by the substrate 10 and the partition wall 20 are filled with a dispersion solution 200 composed of charged electrophoresis particles in which the sealing layer precursor is dissolved and a dispersion medium (see FIG. 2A). In this example, isoparaffin (trade name: Isopar, specific gravity 0.76, manufactured by Exxon Corporation) containing the charge control agent imide succinate (trade name: OLOA1200, manufactured by Chevron Corporation) was used as the dispersion medium. Further, as the charged migration particles, polymer beads made of polystyrene-polymethylmethacrylate copolymer resin containing carbon black having an average particle size of about 1 to 2 μm were used. As the sealing layer precursor, 95 parts by weight of lauryl methacrylate (manufactured by Kishida Chemical Industries, Ltd.) and 5 parts by weight of hexanediol dimethacrylate (manufactured by Wako Pure Chemical Industries, Ltd.) were used. The concentration of this sealing layer precursor is 20 g / L.

Next, after filling the voids with the dispersion liquid 200 in which such a sealing layer precursor is dissolved, a PET film having a polymerization initiation group on the surface of the support layer 30 on the side in contact with the dispersion liquid is used as a partition wall. 20 Placed on top (see Figure 2 (b)).

After this, the PET substrate was allowed to stand on the partition wall at 70 ° C. for 4 hours. In this static process, polymerization starts from the polymerization initiation group on the surface of the partition wall 20 and the insulating layer 90, and as a result, the copolymer is immobilized on the support layer 30, the partition wall 20 and the insulating layer 90, and the sealing layer 60 is formed. Was done. Figure 1 schematically shows this situation. When this electrophoresis display element is disassembled and observed with an electron microscope, a uniform sealing layer 60 is found on the PET surface as a support layer, the partition wall surface, between the PET and the partition wall 20, and on the insulating layer of the substrate 10. It was confirmed that it was formed.

By the way, the first electrode 70 of the electrophoresis display element (not subjected to the above decomposition treatment) thus obtained is grounded, and the potential of the second electrode 80 is + 15 V,-at 1 hertz (Hz). Modulated alternately with 15V. As a result, it is observed that the display changes alternately in black and white in synchronization with the modulation of the potential, and even if such driving is continuously performed, the charged electrophoretic particles are displaced beyond the partition wall. There wasn't. At the same time, the dispersion medium did not volatilize. That is, it was confirmed that the dispersion liquid was confined by the partition wall 20 and the substrate 10. Further, even if the obtained electrophoresis display element was bent back and forth, the phenomenon that the charge electrophoresis particles were displaced beyond the partition wall 20 was not observed.

(Example 7) The manufacturing process of the electrophoresis display element in this example is the same as that in Example 1 until the partition wall is formed. In this embodiment, the surfaces of the partition wall 20 and the insulating layer 90 that have been subjected to UV ashing treatment are spin-coated with a toluene solution in which a compound having an atom transfer radical polymerization initiator group represented by the chemical formula (1) is dissolved. A partition wall 20 and an insulating layer 90 having an atom transfer radical polymerization initiation group can be formed on the surface. Further, the same steps as these are carried out on the surface of the PET film having a thickness of 30 μm on the side in contact with the dispersion liquid to prepare a PET film having an atom transfer radical polymerization initiation group on the surface.

&lt;Chemical formula (1)&gt;<chemistry num="1"><img file="JP2005292789A_D0001.tif" /></chemistry>

Next, the voids formed by the substrate 10 and the partition wall 20 are filled with a dispersion solution 200 composed of charged electrophoresis particles in which the sealing layer precursor is dissolved and a dispersion medium (see FIG. 2A). In this example, isoparaffin (trade name: Isopar, specific gravity 0.76, manufactured by Exxon Corporation) containing the charge control agent imide succinate (trade name: OLOA1200, manufactured by Chevron Corporation) was used as the dispersion medium. Further, as the charge migration particles, polymer beads made of a polystyrene-polymethylmethacrylate copolymer resin containing carbon black having an average particle size of about 1 to 2 μm are used. Further, as the sealing layer precursor, 95 parts by weight of lauryl methacrylate (manufactured by Kishida Chemical Industries, Ltd.) and 5 parts by weight of hexanediol dimethacrylate (manufactured by Wako Pure Chemical Industries, Ltd.) were used. The concentration of this sealing layer precursor is 20 g / L.

Next, after filling the voids with the dispersion liquid 200 in which such a sealing layer precursor is dissolved, a PET film having a polymerization initiation group on the surface on the side in contact with the dispersion liquid is placed on the partition wall 20 as the support layer 30. (See Fig. 2 (b)).

After this, the PET substrate is allowed to stand at 70 ° C for 7 hours. In this static process, polymerization starts from the atom transfer radical polymerization initiation group on the surface of the partition wall 20 and the insulating layer 90, and as a result, the copolymer is immobilized on the support layer 30, the partition wall 20 and the insulating layer 90, and the sealing layer is sealed. 60 was formed. Figure 1 schematically shows this situation. When this electrophoresis display element is disassembled and observed with an electron microscope, a uniform sealing layer 60 is found on the PET surface as a support layer, the partition wall surface, between the PET and the partition wall 20, and on the insulating layer of the substrate 10. It was confirmed that it was formed.

By the way, the first electrode 70 of the electrophoresis display element (not subjected to the above decomposition treatment) thus obtained is grounded, and the potential of the second electrode 80 is + 15 V,-at 1 hertz (Hz). Modulated alternately with 15V. As a result, it is observed that the display changes alternately in black and white in synchronization with the modulation of the potential, and even if such driving is continuously performed, the charged electrophoretic particles are displaced beyond the partition wall. There wasn't. At the same time, the dispersion medium did not volatilize. That is, it was confirmed that the dispersion liquid was confined by the partition wall 20 and the substrate 10. Further, even if the obtained electrophoretic display element was bent back and forth, the phenomenon that the electrophoretic particles were displaced beyond the partition wall 20 was not observed.

As described above, the sealing layer precursor that continuously coated the surface of the support layer 30 and the side surface of the partition wall in the vicinity of the support layer in step 3 (coating step) was polymerized in step 4 (sealing layer forming step). By forming the sealing layer 60 by performing at least one of the treatment and the cross-linking treatment, there is no specific gravity limitation on the sealing layer precursor, and an ultraviolet curable material or the like can be used as the sealing layer precursor. It is possible to form a uniform sealing layer 60.

In the above description, the case where the support layer 30, the partition wall 20, and the insulating layer 90 are covered with the sealing layer 60 has been described, but the present invention is not limited to this, and at least the substrate 10 of the support layer 30 is described. As long as the side surface and the side surface of the partition wall 20 in the vicinity of the support layer 30 are covered, there is no particular limitation on the covering state of the hollow portion.

Therefore, the sealing layer precursor is adsorbed only on the display surface side of the support layer 30 and the partition wall 20, and the sealing layer 60 is the support layer 30 and the support layer as shown in FIG. It may be configured to cover only the gap between 30 and the partition wall 20. Further, the sealing layer precursor is prevented from being adsorbed only on the insulating layer 90, and the support layer 30 and the partition wall 20 are all covered by the step 4 as shown in FIG. 3 (b). good.

Further, in the description so far, the manufacturing method of the electrophoresis display element has been described as an example of the manufacturing method of the display element for displaying by moving the fine particles, but the present invention is not limited to this, and the fine particles are not limited to this. Needless to say, it can be applied to other methods for manufacturing display elements that are moved to display.

<figref num="1">The figure which shows the schematic structure of the electrophoresis display element which concerns on embodiment of this invention.</figref><figref num="2">The figure explaining the manufacturing method of the said electrophoretic display element.</figref><figref num="3">The figure which shows the other structure of the electrophoresis display element which concerns on embodiment of this invention.</figref>

Code description

10 Substrate 20 Partition 30 Support layer 40 Dispersion medium 50 Charging electrophoresis particles 60 Sealing layer 70 1st electrode 80 2nd electrode 90 Insulation layer 200 Dispersion liquid 210 Sealing layer precursor