JP2012027152A - Display medium and display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display medium restrained in faulty displaying due to contact occurring between an adhesive constituting an adhesive section and particle dispersion liquid constituting a display unit when displaying is driven.SOLUTION: A display medium 101 comprises a display unit 20; a display unit wall part 32 disposed continuously along the circumference of the display unit 20, between a surface electrode 13 and a back substrate 11; an adhesive section 31 disposed continuously along the edges of the surface electrode 13 and the back substrate 11, between the surface electrode 13 and the back substrate 11; an adhesive section wall part 33 disposed continuously along the inside of the adhesive section 31, between the surface electrode 13 and the back substrate 11; and a plurality of first columnar sections 34 disposed along the display unit wall part 32 and the adhesive section wall part 33 between the display unit wall part 32 and the adhesive section wall part 33 and at intervals, between the surface electrode 13 and the back substrate 11.

Description

  The present invention relates to a display medium and a display device.

As a display medium, Patent Document 1 discloses that “a broken wall-like wall structure holds a sealing agent and prevents protrusion to a display area”.
Further, Patent Document 2 states that “an injection column structure is formed at the liquid crystal injection port at the opening of the outer peripheral seal to prevent the contaminants that exude from the sealing agent from spreading to the display area”. It is disclosed.
Further, Patent Document 3 discloses that “the dotted line dummy columnar spacers smooth the flow of liquid crystal and prevent air remaining”.
Further, Patent Document 4 discloses that “a linear dummy columnar spacer adjusts the flow of liquid crystal and prevents air remaining”.
Further, Patent Document 5 discloses that “having an impurity blocking liquid crystal flow structure that prevents a contaminant that oozes out from the sealant from spreading to the display area between the outer peripheral seal portion and the display portion”. Yes.

JP 2001-051282 A JP 2001-305556 A JP2003-186026A JP 2003-195318 A JP2007-133392A

  The subject of the present invention is caused by the contact between the adhesive constituting the adhesive portion and the particle dispersion constituting the display portion, which occurs when display driving is performed, as compared with the case where the first columnar portion is not provided. It is to provide a display medium in which display defects are suppressed.

The above problem is solved by the following means. That is,
The invention according to claim 1
A pair of substrates;
A display unit provided between the pair of substrates, which is composed of a particle dispersion liquid including a migrating particle and a dispersion medium in which the migrating particle is dispersed, and displays the image by moving the migrating particle by an electric field. A display unit;
A first wall portion provided continuously along the periphery of the display portion between the pair of substrates;
An adhesive portion provided continuously along an edge of the pair of substrates between the pair of substrates;
A second wall portion provided continuously along the inside of the bonding portion between the pair of substrates;
Between the first wall portion and the second wall portion between the pair of substrates, the first wall portion is provided in a plurality along the first wall portion and the second wall portion with a space therebetween. A columnar section;
A display medium comprising:

The invention according to claim 2
The display medium according to claim 1, wherein a length along the arrangement direction in the first columnar portion is longer than a length along a direction intersecting the arrangement direction.

The invention according to claim 3
A second array is provided between the first columnar portion and the first wall portion between the pair of substrates, along the first columnar portion and the first wall portion, and arranged in a plurality at intervals. The display medium according to claim 1, comprising a columnar part.

The invention according to claim 4
The shortest distance between the adjacent first columnar portions and the shortest distance between the adjacent second columnar portions are shorter than the shortest distance between the adjacent first columnar portions and the second columnar portions, respectively. 3. The display medium according to 3.

The invention according to claim 5
The display medium according to any one of claims 1 to 4,
An electric field forming unit that forms an electric field between a pair of substrates provided in the display medium;
A display device comprising:

According to the first aspect of the present invention, compared with the case where the first columnar portion is not provided, the adhesive that forms the adhesive portion and the particle dispersion that forms the display portion, which are generated when display driving is performed, are performed. Display defects due to contact are suppressed.
The invention according to claim 2 occurs when display driving is performed as compared with a case where the length along the arrangement direction of the first columnar portions is shorter than the length along the direction intersecting the arrangement direction. Display defects due to the contact between the adhesive constituting the adhesive portion and the particle dispersion constituting the display portion are suppressed.
According to the third aspect of the invention, compared to the case where the second columnar portion is not provided, the adhesive that forms the adhesive portion and the particle dispersion that forms the display portion, which are generated when display driving is performed, are performed. Display defects due to contact are suppressed.
According to the invention which concerns on Claim 4, the shortest distance of adjacent 1st columnar part and the shortest distance of adjacent 2nd columnar part are the shortest of the adjacent 1st columnar part and 2nd columnar part, respectively. Compared with the case where the distance is longer than the distance, display defects caused by the contact between the adhesive constituting the adhesive portion and the particle dispersion constituting the display portion, which are generated when display driving is performed, are suppressed.
According to the invention which concerns on Claim 5, compared with the case where the display medium which does not provide the 1st columnar part is applied, the adhesive agent which comprises an adhesive part and a display part which generate | occur | produce when a display drive is performed are comprised. Display defects due to contact with the particle dispersion are suppressed.

1 is a schematic plan view showing a display device according to a first embodiment. 1 is an enlarged schematic cross-sectional view showing a display device according to a first embodiment. 1 is an enlarged schematic cross-sectional view showing a display device according to a first embodiment. 1 is an enlarged schematic plan view showing a display medium according to a first embodiment. It is a partial expanded sectional view which shows the display medium which concerns on 1st Embodiment. It is an expansion fracture | rupture schematic plan view which shows the display medium which concerns on other 1st Embodiment. It is an expansion fracture | rupture schematic plan view which shows the display medium which concerns on other 1st Embodiment. FIG. 5 is a schematic plan view for explaining the operation of the display medium according to the first embodiment. FIG. 5 is a schematic plan view for explaining the operation of the display medium according to the first embodiment. It is a schematic plan view for demonstrating the effect | action of the columnar part provided continuously. It is an expansion fracture | rupture schematic plan view which shows the display medium which concerns on 2nd Embodiment. It is a partial expanded sectional view which shows the display medium which concerns on 2nd Embodiment. It is a typical top view for explaining the operation of the display medium concerning a 2nd embodiment. It is a typical top view for explaining the operation of the display medium concerning a 2nd embodiment. It is a typical top view for explaining the operation of the display medium concerning a 2nd embodiment.

  Below, an example of an embodiment concerning the present invention is described based on a drawing.

(First embodiment)
FIG. 1 is a schematic plan view showing the display device according to the first embodiment. 2 and 3 are enlarged schematic cross-sectional views showing the display device according to the first embodiment. FIG. 4 is an enlarged schematic plan view showing the display medium according to the first embodiment. FIG. 5 is a partially enlarged cross-sectional view showing the display medium according to the first embodiment.
2 and 3 correspond to partial enlarged cross-sectional views of the display portion of the display medium. 4 and 5 correspond to a plan view and a cross-sectional view of the region A shown in FIG.

  The display device 100 according to the first embodiment is, for example, a device that can store and rewrite images (specifically, for example, a bulletin board, a circulation version, an electronic blackboard, an advertisement, a signboard, a flashing sign, electronic paper, Electronic newspapers, electronic books, and document sheets that can be shared with copiers and printers).

  Specifically, as shown in FIGS. 1 to 5, the display device 100 according to the first embodiment forms an electric field in the display medium 101 by applying a voltage to the display medium 101 and the display medium 101, for example. And an electric field forming unit 40 to be provided.

-Display media-
The display medium 101 includes, for example, a front substrate 10 serving as an image display surface, a rear substrate 11 disposed to face the front substrate 10 with a gap between the front substrate 10, and between the front substrate 10 and the rear substrate 11. And a display unit 20 that displays an image.
Note that the display unit 20 includes, for example, a particle dispersion liquid 25 including the migrating particles 21 and the dispersion medium 22 in which the migrating particles 21 are dispersed.

  Between the front substrate 10 and the rear substrate 11, for example, a display unit 20 is provided in the central portion of the substrate (the central portion when viewed from the substrate side) and continuously along the edge of the substrate. An adhesive portion 31 made of the provided adhesive 31A is provided. And the front substrate 10 and the back substrate 11 are joined in the state bonded together by the adhesion part 31, for example.

  Here, the region between the front substrate 10 and the rear substrate 11 is a region in which the display unit 20 is provided in the central portion (the central portion when viewed from the substrate side) of the front substrate 10 and the rear substrate 11, and the display unit. It is divided into a region outside 20 (hereinafter referred to as a redundant portion 30), and the adhesive portion 31 is provided in the redundant portion 30.

First, the front substrate 10 and the rear substrate 11 will be described.
The surface substrate 10 includes a support substrate 12 and a surface electrode 13 formed on the surface of the support substrate 12 facing the back substrate 11.
On the other hand, the back substrate 11 includes a support substrate 14 and a back electrode 15 formed on the surface of the support substrate 14 facing the front substrate 10.

  Of the front substrate 10 and the rear substrate 11, at least the front substrate 10 serving as an image display surface has translucency. Here, translucency refers to that the transmittance of visible light is 60% or more.

  Examples of the material constituting the support substrate 12 and the support substrate 14 include glass, plastic, polyethylene terephthalate resin, polyethylene naphthalate resin, polycarbonate resin, acrylic resin, polyimide resin, polyester resin, epoxy resin, and polyether sulfone resin. Etc.

  The support substrate 12 and the support substrate 14 may be flexible or non-flexible. For example, when the display medium 101 is manufactured, a surface substrate is used. When the bonding of the substrate 10 and the back substrate 11 is performed by a roll-to-roll method, one having flexibility is selected.

  Examples of the material constituting the surface electrode 13 and the back electrode 15 include oxides such as indium, tin, cadmium, and antimony, composite oxides such as ITO, metals such as gold, silver, copper, and nickel, polypyrrole, and polythiophene. Organic materials and the like. These materials constitute an electrode as, for example, a single layer film, a mixed film, or a composite film. Each electrode is formed using these materials by, for example, a vapor deposition method, a sputtering method, a coating method, a CVD method (vapor phase growth method), or the like.

Next, the display unit 20 will be described.
The display unit 20 is composed of a particle dispersion liquid 25 that includes migrating particles 21 (groups thereof) and a dispersion medium 22 in which the migrating particles 21 are dispersed. That is, the display unit 20 is configured with the particle dispersion liquid sealed between the front substrate 10 and the rear substrate 11.

Examples of the dispersion medium 22 include an insulating liquid. Here, “insulating” means that the volume resistance value is 10 ⁷ Ω · cm or more.
Examples of the insulating liquid include hexane, cyclohexane, toluene, xylene, decane, hexadecane, kerosene, paraffin, isoparaffin, silicone oil, modified silicone oil, dichloroethylene, trichloroethylene, perchloroethylene, high-purity petroleum, ethylene glycol, alcohols , Ethers, esters, dimethylformamide, dimethylacetamide, dimethylsulfoxide, N-methylpyrrolidone, 2-pyrrolidone, N-methylformamide, acetonitrile, tetrahydrofuran, propylene carbonate, ethylene carbonate, benzine, diisopropylnaphthalene, olive oil, isopropanol, trichloro Trifluoroethane, tetrachloroethane, dibromotetrafluoroethane, etc. Mixtures of al are preferably exemplified.
As the insulating liquid, for example, water from which impurities are removed so as to have the following volume resistance value (so-called pure water) can be cited.

  Examples of the dispersion medium 22 include a polymer. Examples of the polymer include a polymer gel and a polymer. Specifically, examples of the polymer include gelatin, polyvinyl alcohol, poly (meth) acrylamide and the like.

  Here, the dispersion medium 22 may be composed of an insulating liquid alone or a polymer alone, but may be a mixture of a resin insulating liquid and a polymer resin.

The volume resistivity of the dispersion medium 22, for example, often is 10 ⁷ Ω · cm or more, preferably not more than 10 ⁷ Ω · cm or more ^{10 19 Ω} · cm, more preferably ^{10 10 Ω} · cm or more 10 ¹⁹ Ω · cm or less. By setting the volume resistance value within this range, an electric field is applied to the migrating particles 21 (group), and generation of bubbles due to electrolysis of the dispersion medium 22 due to electrode reaction is suppressed.

  For example, an acid, an alkali, a salt, a dispersion stabilizer, an additive for the purpose of preventing oxidation or ultraviolet absorption (for example, a stabilizer, an antibacterial agent, a preservative, etc.) is added to the dispersion medium 22 as necessary. May be. However, it is desirable to add so that it may become the range of the specific volume resistance value shown above.

  Examples of the dispersion medium 22 include a charge control agent (for example, an anionic surfactant, a cationic surfactant, an amphoteric surfactant, a nonionic surfactant, a fluorosurfactant, a silicone surfactant, a metal Soap, alkyl phosphate esters, succinimides, etc.) may be added.

  The migrating particles 21 are composed of, for example, a group of a plurality of particles, and are dispersed in the dispersion medium 22, and between the substrates of the front substrate 10 and the rear substrate 11 according to the direction strength of the electric field formed between the substrates. Is supposed to move.

  Examples of the migrating particles 21 include insulating metal oxide particles such as glass beads, alumina, and titanium oxide, thermoplastic or thermosetting resin particles, those obtained by fixing a colorant on the surface of these resin particles, Examples thereof include particles containing an insulating colorant in a plastic or thermosetting resin, and metal colloid particles having a plasmon coloring function.

  The resin constituting the migrating particles 21 may be mixed with, for example, a charge control agent that controls chargeability, if necessary. Moreover, you may mix a magnetic material in the inside and the surface of the migrating particle 21 as needed. Further, an external additive may be attached to the surface of the migrating particle 21 as necessary.

The display unit 20 includes, for example, reflective particles 23.
The reflective particles 23 are arranged so as to exist over the entire surface of the front substrate 10 between the front substrate 10 and the rear substrate 11.
In the present embodiment, the reflective particles 23 are illustrated so as to be arranged in the direction of the surface of the substrate (the front substrate 10 and the rear substrate 11) for convenience, but are arranged so as to overlap in a plurality of rows in the substrate thickness direction. It doesn't matter. Moreover, the diameter of the reflective particles 23 may be approximately the same as that of the migrating particles 21 or about 100 times as long as the reflective particles 23 are disposed almost entirely within the surface of the surface substrate 10.

  The reflective particle 23 has an optical reflection characteristic different from that of the particles constituting the migrating particle 21. A gap is formed between the reflective particles 23 so that the particles constituting the migrating particles 21 can pass therethrough. The reflective particles 23 are dispersed in the dispersion medium 22, and when the migrating particles 21 move, the reflecting particles 23 may move with the flow of the dispersion medium 22 and pass through the migrating particles 21. .

“Having optical reflection characteristics different from the particles constituting the migrating particles 21” means that the color of the dispersion medium 22 in which only the migrating particles 21 are dispersed and the reflecting particles 23 are compared with each other and visually observed. This means that there is a discernible difference between the two in degree, brightness, and saturation. Of these chromaticity, lightness, and saturation, it is desirable that the chromaticity is particularly different.
For example, when the chromaticity is different, specifically, the “identifiable difference” indicates the CIELAB value in each of the dispersion medium 22 in which only the migrating particles 21 are dispersed and the reflective particles 23 is X-Rite. It means that the difference between a * and b * when measured by X-Rite 404 manufactured by the company is 5 or more.

The display unit 20 includes, for example, a partition member 24 that partitions a plurality of substrates between the front substrate 10 and the rear substrate 11.
The partition member 24 has a function of maintaining a distance between the front substrate 10 and the rear substrate 11 and a function of partitioning a plurality of gaps between the front substrate 10 and the rear substrate 11. Note that the partition member 24 may have only a function of maintaining the distance between the front substrate 10 and the rear substrate 11 and does not partition the gap between the substrates.

A region (hereinafter referred to as a cell) partitioned by the partition member 24 is surrounded by the front substrate 10, the back substrate 11, and the partition member 24. The partition member 24 has cells formed two-dimensionally so as to correspond to each pixel when an image is displayed on the display medium 101.
And the particle dispersion liquid 25 and the reflective particle 23 are enclosed with the cell.

Examples of the constituent material of the partition member 24 include thermoplastic resins, thermosetting resins, electron beam curable resins, photo curable resins, rubbers, metals, and the like.
As a method of forming the partition member 24, for example, 1) a layer of photosensitive resin having adhesiveness (for example, thermoplastic resin: acrylic resin, acrylate, urethane, etc.) is formed on one of the front substrate 10 and the rear substrate 11. Then, a method of forming a latent image on the layer of the resin by exposing it to light using a photolithography method, and developing it. 2) Thermal nanoimprint, optical nanoimprint, or nanoimprint combining these, Examples of embossing methods and 3) other known methods.

  The partition member 24 may be colored or colorless, but is desirably colorless and transparent so as not to adversely affect the display image displayed on the display medium 101. In that case, for example, polystyrene, polyester, acrylic, or the like is used. Transparent resin or the like is used. Note that “transparent” means having a transmittance of 50% or more with respect to visible light.

  For example, the partition member 24 may be configured to adhere to the opposing substrates (the front substrate 10 and the rear substrate 11). In that case, for example, an adhesive material is disposed on the top of the partition member 24 or the opposing substrate surface, or the partition member 24 itself is held by adhesion or adhesion to the opposing substrate surface by heat or pressure. It is better to configure.

Next, the redundant part 30 will be described.
As described above, for example, the adhesive portion 31 made of the adhesive 31 </ b> A provided continuously along the edge of the substrate is provided between the front substrate 10 and the rear substrate 11 serving as the redundant portion 30. Yes.

Between the front substrate 10 and the rear substrate 11 serving as the redundant portion 30, for example, a wall portion for damming the particle dispersion 25 constituting the display unit 20, which is continuous along the periphery of the display unit 20. A first wall portion 32 (hereinafter referred to as a display portion wall portion 32). That is, the display unit wall 32 is provided so as to surround the display unit 20 together with the front substrate 10 and the rear substrate 11.
The display portion wall portion 32 may also serve as the partition member 24 constituting the display portion 20.

The display unit wall portion 32 is a wall portion having a function of suppressing intrusion of the particle dispersion liquid 25 to the outside between the front substrate 10 and the rear substrate 11, and is in contact with (for example, close contact with) the front substrate 10 and the rear substrate 11. Is provided.
However, the display unit wall 32 is provided by being bonded to at least one of the front substrate 10 and the rear substrate 11 by an adhesive, a forming method, which will be described later, or the like (ie, liquid) because of the necessity of fixing. The object is provided in a state where it does not enter the gap between the substrate and the wall). For example, in the present embodiment, the display unit wall portion 32 is provided in a state in which it is bonded and fixed to the back substrate 11 and is not fixed in contact with the front substrate 10.

  Between the front substrate 10 and the rear substrate 11 that become the redundant portion 30, it is a wall portion for blocking the adhesive 31 </ b> A constituting the adhesive portion 31, and is provided continuously along the inside of the adhesive portion 31. And a second wall portion 33 (hereinafter referred to as a bonding portion wall portion 33). That is, the bonding portion wall 33 is provided so as to be surrounded by the bonding portion 31 together with the front substrate 10 and the rear substrate 11.

The adhesion portion wall portion 33 is a wall portion having a function of suppressing the intrusion of the adhesive 31 </ b> A to the inside between the front substrate 10 and the rear substrate 11, and contacts (for example, closely contacts) the front substrate 10 and the rear substrate 11. Is provided.
However, the bonding portion wall portion 33 is provided, for example, by bonding to at least one of the front substrate 10 and the rear substrate 11 by an adhesive, a forming method described later, or the like (ie, liquid) because of the necessity of fixing. The object is provided in a state where it does not enter the gap between the substrate and the wall). For example, in the present embodiment, the display unit wall portion 32 is provided in a state in which it is bonded and fixed to the back substrate 11 and is not fixed in contact with the front substrate 10.

Between the front substrate 10 and the rear substrate 11 that become the redundant portion 30, along the display portion wall portion 32 and the adhesive portion wall portion 33, and between the display portion wall portion 32 and the adhesive portion wall portion 33. The first columnar portions 34 are arranged in a plurality with intervals. In other words, the first columnar portion 34 is provided so as to divide between the display portion wall portion 32 and the bonding portion wall portion 33.
For example, when the first columnar portion 34 is bonded to the front substrate 10 and the rear substrate 11, the particle dispersion 25 and the adhesive 31A get over the display portion wall portion 32 and the adhesive portion wall portion 33, respectively. When entering the region between the display portion wall portion 32 and the bonding portion wall portion 33, the particle dispersion liquid 25 and the adhesive are provided between the first columnar portion 34 and at least one of the front substrate 10 and the rear substrate 11. It is a member having a function of sucking and holding 31A by capillary action due to a gap generated between the gaps.

The first columnar part 34 is provided in contact (for example, in close contact) with the front substrate 10 and the rear substrate 11.
However, the first columnar portion 34 is provided, for example, by bonding to one of the front substrate 10 and the rear substrate 11 by an adhesive, a formation method described later, or the like (that is, a liquid material). Is provided in a state where it does not enter the gap between the substrate and the wall). For example, in the present embodiment, the first columnar portion 34 is provided in a state in which it is bonded and fixed to the back substrate 11 and is not fixed in contact with the front substrate 10.

  Even if the first columnar part 34 is arranged in contact with the substrate (for example, in close contact), if it is arranged in a non-fixed state, a slight gap is formed, and suction / holding by the capillary phenomenon is performed. This function is considered to occur. In this regard, the first columnar section 34 may be arranged with a gap as long as it does not impair the function of sucking and holding by either the front substrate 10 or the rear substrate 11 and the capillary phenomenon.

The first columnar section 34 is provided along the display section wall section 32 and the bonding section wall section 33 and arranged in a plurality with intervals, specifically, for example, the display section wall section. A central portion between 32 and the bonding portion wall portion 33 is provided intermittently along the long and short sides of the front substrate 10 and the rear substrate 11.
The interval between the adjacent first columnar portions 34 arranged, that is, the arrangement pitch RA (shortest distance along the arrangement direction) is, for example, 100 μm or more and 3000 μm or less (preferably 200 μm or more and 1000 μm or less). .
The shortest distance (arrangement pitch RA) between the adjacent first columnar portions 34 arranged is the shortest distance between the first columnar portion 34 and the bonding portion wall portion 33 and the first columnar portion and the display portion wall. It is preferable that each distance is shorter than the shortest distance from the portion 32.

Here, for example, when the display medium 101 is manufactured, the front substrate 10 and the rear substrate 11 are moved from one end to the other end as in the case of bonding the front substrate 10 and the rear substrate 11 by a roll-to-roll method. In the redundant portion 30 on the side of the substrate that intersects (for example, orthogonally) the bonding direction, the particle dispersion 25 and the adhesive 31A are respectively applied to the display portion wall portion 32 and the adhesive portion wall portion. Since it is easy to enter the region between the display portion wall portion 32 and the bonding portion wall portion 33 over the 33, it is provided in the redundant portion 30 on the side of the substrate that intersects (for example, perpendicularly) to the bonding direction. The first columnar portions 34 are preferably arranged so that the arrangement pitch RA is smaller than the first columnar portions 34 provided in the redundant portions 30 on the sides of the substrates along the bonding direction.
Specifically, for example, when the short side of the front substrate 10 and the back substrate 11 corresponds to a side intersecting (for example, orthogonal to) the bonding direction, and the long side corresponds to a side along the bonding direction, the short side The first columnar portion 34 provided in the redundant portion 30 of the first columnar portion 34 may have a shorter arrangement pitch RA than the first columnar portion 34 provided in the long-side redundant portion 30 (see FIG. 6: P in FIG. Show directions).

The planar shape of the first columnar part 34 (the shape seen from the substrate side) is, for example, a square shape of 50 μm × 50 μm to 1000 μm × 1000 μm (see FIG. 4).
The planar shape of the first columnar portion 34 is not limited to a square shape, and, for example, the long side along the display portion wall portion 32 and the bonding portion wall portion 33, the display portion wall portion 32, and the bonding portion wall portion 33. From the length (short side) along the direction in which the length (long side) along the arrangement direction of the first columnar portions 34 intersects with the arrangement direction. May have a long shape (see FIG. 7). When the planar shape of the first columnar part 34 is rectangular, the length of the long side is preferably, for example, 100 μm or more and 3000 μm or less, and the length of the short side is, for example, 50 μm or more and 1000 μm or less.
The planar shape of the first columnar section 34 may be a circle or other shapes.

Here, as a constituent material of the display portion wall portion 32, the adhesive portion wall portion 33, and the first columnar portion 34, for example, a thermoplastic resin, a thermosetting resin, an electron beam curable resin, a light curable resin, a rubber, and the like. And metals.
The method for forming the display portion wall portion 32, the bonding portion wall portion 33, and the first columnar portion 34 is, for example, 1) photosensitive resin having adhesiveness (for example, thermoplastic resin: acrylic resin, acrylate, urethane, etc.) 2) is formed on one of the front substrate 10 and the rear substrate 11, and then exposed to light using a photolithography method to form a latent image on the resin layer, followed by development. A method of embossing a resin by thermal nanoimprinting, optical nanoimprinting, or nanoimprinting a combination thereof, and 3) other known methods.

  The display portion wall portion 32, the bonding portion wall portion 33, and the first columnar portion 34 may be colored or colorless, but are colorless and transparent so as not to adversely affect the display image displayed on the display medium 101. In this case, for example, a transparent resin such as polystyrene, polyester, or acrylic is used. Note that “transparent” means having a transmittance of 50% or more with respect to visible light.

-Electric field forming part 40-
The electric field forming unit 40 is electrically connected to the front electrode 13 and the back electrode 15. The electric field forming unit 40 is a voltage applying device for applying a voltage to the surface electrode 13 and the back electrode 15. By applying a voltage between the surface electrode 13 and the back electrode 15 by the electric field forming unit 40, the surface electrode 13 An electric field is formed between the back electrode 15 and the back electrode 15. The electric field forming unit 40 of the display device 100 may be detachably connected to the display medium 101 (the front electrode 13 and the back electrode 15). In this case, for example, only when the display medium 101 needs to be rewritten or displayed, the display medium 101 is connected to the electric field forming unit 40 to display the image information, and separated from each other during storage. 101 is configured to improve portability.

  In the above configuration, both the front substrate 10 and the rear substrate 11 are provided with electrodes (the front electrode 13 and the rear electrode 15), but may be provided only on either one. In this case, for example, one of the surface electrode 13 and the back electrode 15 is grounded, and the other is connected to the electric field forming unit 40.

  Here, in the display unit 20 of the display medium 101, when a voltage is applied from the electric field forming unit 40 to the front electrode 13 and the back electrode 15 of the display medium 101, an electric field corresponding to the applied voltage is applied to the dispersion medium 22. Formed inside.

  Due to the formed electric field, the migrating particles 21 move between the front substrate 10 and the rear substrate 11. For example, when the particles constituting the migrating particles 21 are charged to the negative electrode and a positive voltage is applied to the front electrode 13 and a negative voltage is applied to the back electrode 15, the particles constituting the migrating particles 21 are reflected particles 23. And move from the back substrate 11 side to the front substrate 10 side (see FIG. 2). At this time, when viewed from the front substrate 10 side, the color of the migrating particles 21 located on the front substrate 10 side is visually recognized as the color of the display medium 101.

On the other hand, when a negative voltage is applied to the front electrode 13 and a positive voltage is applied to the back electrode 15, the particles constituting the migrating particles 21 pass through the gaps in the reflective particles 23 and are from the front substrate 10 side to the back substrate 11 side. (See FIG. 3). At this time, when viewed from the surface substrate 10 side, the color of the reflective particles 23 is visually recognized as the color of the display medium 101.
The reflecting particles 23 are charged with a polarity different from that of the migrating particles 21, and are configured to move between the substrates in the opposite direction to the migrating particles 21 when a voltage is applied to the front electrode 13 and the back electrode 15. Also good.

  In the display medium 101 according to the present embodiment described above, the display unit 20 and the display unit wall 32 provided continuously along the periphery of the display unit 20 between the surface electrode 13 and the back substrate 11; An adhesive portion 31 provided continuously along the edge of the surface electrode 13 and the back substrate 11 between the surface electrode 13 and the back substrate 11 and an inside of the adhesive portion 31 between the surface electrode 13 and the back substrate 11 The display portion wall portion 32 and the adhesive portion wall portion 33 provided between the surface portion electrode 13 and the back substrate 11 and the adhesive portion wall portion 33 between the surface electrode 13 and the rear substrate 11. The first columnar section 34 is provided along the bonding section wall section 33 and arranged in a plurality with intervals.

Here, the display medium 101 includes, for example, the display unit wall portion 32 together with the display unit 20 formed of the particle dispersion 25 on the surface of the back substrate 11 (on the surface facing the front substrate 10). Then, after providing the bonding portion wall 33 and the first columnar portion 34 and applying the adhesive 31A to be the bonding portion 31 along the substrate edge portion outside the bonding portion wall portion 33, the rear substrate 11 The surface substrate 10 is bonded to the substrate. The display unit 20 is provided in a state where the particle dispersion 25 is dammed up by the display unit wall 32 (or the partition member 24).
Note that the manufacturing method is not limited to the above method. For example, 1) After the above portions are provided on the surface of the surface substrate 10 (on the surface facing the back substrate 11), the back substrate 11 is mounted. 2) The display unit 20, the display unit wall 32, and the bonding unit wall 33 are provided on the surface of the back substrate 11, and the surface substrate 10 is provided on the surface of the surface substrate 10. The first columnar portion 34 is provided, and the respective portions are separately provided on the substrate, and after the adhesive 31A is applied to one of the substrates, the front substrate 10 and the rear substrate 11 are bonded together. May be.

  When the front substrate 10 and the rear substrate 11 are bonded together, the particle dispersion 25 constituting the display unit 20 and the adhesive 31A serving as the bonding unit 31 are liquid materials, but the display unit wall unit 32 is provided respectively. Further, the particle dispersion liquid 25 and the adhesive 31 </ b> A are prevented from entering the display portion wall portion 32 and the bonding portion wall portion 33.

However, since the particle dispersion 25 and the adhesive 31A are liquid materials, the surface substrate 10 and the back substrate 11 get over the display portion wall portion 32 and the adhesive portion wall portion 33 at the time of bonding, In some cases, the display portion wall portion 32 and the bonding portion wall portion 33 may enter the region. Then, the particle dispersion 25 and the adhesive 31A come into contact with each other.
When this contact occurs, a change in physical properties of the infiltrated particle dispersion 25 (for example, conductivity of the dispersion medium 22, chargeability of the migrating particles 21, etc.) occurs, and accordingly, the invading particle dispersion 25 and the display unit 20 exist. Since the particle dispersion liquid 25 is connected, the physical properties of the particle dispersion liquid 25 existing in the display unit 20 may be changed (for example, viscosity), which may cause display defects. In addition, if the adhesive 31 </ b> A reaches the display unit 20, a more remarkable display failure may be caused.

Specifically, in the electrophoretic display medium 101, the particle dispersion 25 enclosed in the display medium 101 is usually used to improve the responsiveness of the electrophoretic particles 21 dispersed in the particle dispersion 25. A dispersion medium 22 having a low viscosity is used. Since the viscosity of the dispersion medium 22 is lower than that of the liquid crystal for the display medium, when the dispersion medium 22 comes into contact with the adhesive 31A (sealant) before curing, the dispersion with the particle dispersion 25 is adhered even during the time until the adhesive 31A is cured. The agent 31 </ b> A may be mixed, and in particular, the component of the adhesive 31 </ b> A may dissolve into the particle dispersion 25. When this dissolution occurs, the chargeability of the migrating particles 21 in the particle dispersion 25 changes or the conductivity of the particle dispersion 25 (dispersion medium 22) changes, and an electric field corresponding to the display signal is generated. When applied, the responsiveness of the migrating particles 21 and the amount of migrating migrating particles 21 change, and the display density and display color may change, which is recognized as a display defect.
After the adhesive 31A (sealant) is cured, even if it comes into contact with the particle dispersion 25, it is difficult for dissolution to occur. However, the display medium substrate (surface substrate 10 and back substrate 11) is bonded and the particle separation 25 is applied. When the particle dispersion 25 and the adhesive 31A (sealing agent) before curing come into contact at the time of sealing, problems such as generation of a display defect and change in display state over time occur.

  On the other hand, if the particle dispersion 25 reaches the adhesion part 31, adhesion failure between the front substrate 10 and the rear substrate 11 may be caused.

  Therefore, in the present embodiment, the first columnar portion 34 is provided between the display portion wall portion 32 and the bonding portion wall portion 33 between the surface electrode 13 and the back substrate 11. The first columnar section 34 is provided along the display section wall section 32 and the bonding section wall section 33 and arranged in a plurality at intervals.

  When the first columnar portion 34 is provided, the adhesive 31 </ b> A that has entered between the first columnar portion 34 and the bonding portion wall portion 33 is separated from the first columnar portion 34 and the substrate (in this embodiment, the first columnar portion 34 is It is sucked by capillary action in the gap with the surface substrate 10) provided in a non-fixed state in contact. Since a plurality of the first columnar portions 34 are arranged at intervals, that is, provided intermittently, the sucked adhesive 31A is placed in the gap between one first columnar portion 34 and the substrate. It is retained and retained (see FIGS. 8 and 9A).

  On the other hand, the particle dispersion liquid 25 that has entered between the first columnar portion 34 and the display portion wall portion 32 is in a state where the first columnar portion 34 and the substrate (in this embodiment, the first columnar portion 34 is not fixed by contact). Is sucked by the capillary action in the gap with the surface substrate 10). Since a plurality of the first columnar portions 34 are arranged at intervals, that is, provided intermittently, the sucked particle dispersion 25 has a gap between one first columnar portion 34 and the substrate. (See FIGS. 8 and 9B).

  When the first columnar portion 34 is continuously provided along the display portion wall portion 32 and the bonding portion wall portion 33, the first columnar portion 34 is sucked into the gap between the first columnar portion 34 and the substrate by capillary action. The adhesive 31A and the particle dispersion 25 spread in the gap between the first columnar portion 34 and the substrate and come into contact with each other (see FIG. 10).

Therefore, in the present embodiment, in the display medium 101, contact between the adhesive 31 </ b> A constituting the adhesive part 31 and the particle dispersion 25 constituting the display part 20 is suppressed. As a result, display defects caused by the contact between the adhesive 31 </ b> A constituting the adhesive portion 31 and the particle dispersion 25 constituting the display portion 20, which are generated when display driving is performed, are suppressed.
In the present embodiment, the peripheral portion of the display medium 101, that is, the redundant portion 30, together with the display portion wall portion 32 and the adhesive portion wall portion 33, the first columnar portion causes the front substrate 10 and the rear substrate 11 to be connected. Since the distance between the substrates is supported, the distance between the substrates is less likely to vary, and display defects due to the variation in the distance between the substrates are suppressed.

  Further, in the present embodiment, in the display medium 101, the first columnar portion 34 has a planar shape such that the length along the arrangement direction is longer than the length along the direction intersecting the arrangement direction. The contact area (or opposing area) between the first columnar part 34 and the substrate is increased while securing the distance between the one columnar part 34 and the display part wall part 32 and the bonding part wall part 33. Even if the amount of the particle dispersion 25 and the adhesive 31A that penetrates increases, the particle dispersion 25 and the adhesive 31A remain in the gap between the first columnar portion 34 and the substrate. As a result, the contact between the adhesive 31 </ b> A constituting the adhesive part 31 and the particle dispersion 25 constituting the display part 20 is easily suppressed. As a result, display defects caused by the contact between the adhesive 31 </ b> A constituting the adhesive portion 31 and the particle dispersion 25 constituting the display portion 20, which are generated when display driving is performed, are easily suppressed.

(Second Embodiment)
FIG. 11 is an enlarged schematic plan view showing a display medium according to the second embodiment. FIG. 12 is a partially enlarged cross-sectional view showing a redundant portion of the display medium according to the second embodiment.
11 and 12 correspond to a plan view and a cross-sectional view of the region A shown in FIG.

As shown in FIGS. 11 to 12, the display medium 102 according to the second embodiment includes a first columnar section 34, a display section wall section 32, and a display section wall section 32 between the front substrate 10 and the rear substrate 11 serving as the redundant section 30. In the meantime, the second columnar section 35 is provided along the first columnar section 34 and the display section wall section 32 and arranged in a plurality with intervals.
That is, the second columnar portion 35 is provided so as to divide between the first columnar portion 34 and the display portion wall portion 32.

  The second columnar part 35, for example, when the surface substrate 10 and the back substrate 11 are bonded together, the particle dispersion 25 and the adhesive 31A get over the display part wall part 32 and the adhesive part wall part 33, respectively. When entering the region between the first columnar portion 34 and the second columnar portion 35, or the region between the second columnar portion 35 and the display portion wall portion 32, the second columnar portion 35, the surface substrate 10, and the back surface It is a member having a function of sucking and holding the particle dispersion 25 and the adhesive 31 </ b> A with at least one of the substrates 11 by capillarity due to a gap generated between the substrates 11.

The second columnar section 35 is provided along the display section wall section 32 and the bonding section wall section 33 and arranged in a plurality with a gap. Specifically, for example, the first columnar section 34 is provided, for example. And the center part between the wall parts 32 for display parts is provided intermittently along the long side and short side of the surface substrate 10 and the back substrate 11. FIG.
The interval between the second columnar portions 35 to be arranged, that is, the arrangement pitch RB (shortest distance along the arrangement direction) is preferably, for example, 100 μm or more and 3000 μm or less (desirably 200 μm or more and 1000 μm or less).

Here, the first columnar part 34 and the second columnar part 35 are such that the shortest distance (arrangement pitch RA) between the adjacent first columnar parts 34 arranged is the adjacent first columnar part 34 and second columnar part. It is good to provide so that it may become shorter than the shortest distance RC.
Further, the first columnar part 34 and the second columnar part 35 are such that the shortest distance (arrangement pitch RB) between the adjacent second columnar parts 35 arranged is that the first columnar part 34 and the second columnar part adjacent to each other. It is preferable to arrange so as to be shorter than the shortest distance RC.
The shortest distance (arrangement pitch RA) between the adjacent first columnar portions 34 that are arranged is preferably shorter than the shortest distance between the first columnar portion 34 and the bonding portion wall portion 33. Moreover, the shortest distance (arrangement pitch RB) between the arranged second columnar portions 35 is preferably shorter than the shortest distance between the second columnar portions 35 and the display portion wall portion 32.

  Since other than these are the same as in the first embodiment, description thereof is omitted.

  In the display medium 102 according to the present embodiment described above, in addition to the configuration of the first embodiment, the first columnar section 34 and the display section wall section 32 between the surface electrode 13 and the rear substrate 11 are arranged between the first columnar section 34 and the display section wall section 32. A second columnar section 35 is provided along the one columnar section 34 and the display section wall section 32 and arranged in a plurality with intervals.

  First, as described in the first embodiment, when the first columnar portion 34 is provided, the adhesive 31A that has entered between the first columnar portion 34 and the bonding portion wall portion 33 is separated from the first columnar portion 34 and the substrate. (In this embodiment, the first columnar portion 34 is sucked by capillary action in the gap with the surface substrate 10 provided in a state where the first columnar portion 34 is not fixed in contact with the first columnar portion 34. Since a plurality of the first columnar portions 34 are arranged at intervals, that is, provided intermittently, the sucked adhesive 31A is placed in the gap between one first columnar portion 34 and the substrate. It is retained and retained (see FIGS. 13 and 14A).

  On the other hand, when the second columnar portion 35 is provided, the particle dispersion liquid 25 that has entered between the second columnar portion 35 and the display portion wall portion 32 is separated from the second columnar portion 35 and the substrate (in this embodiment, the second columnar portion 35). The portion 35 is sucked by capillary action in the gap with the surface substrate 10) provided in a state where it is not fixed in contact. Since a plurality of the second columnar portions 35 are arranged at intervals, that is, provided intermittently, the sucked particle dispersion 25 has a gap between one second columnar portion 35 and the substrate. (See FIG. 13 and FIG. 14B).

That is, the adhesive 31 </ b> A that has invaded beyond the bonding portion wall 33 is intermittently provided by the first columnar portion 34 that is intermittently provided, and the particle dispersion 25 that has intruded beyond the display portion wall 32 is intermittently provided. Each of the second columnar portions 35 provided on the substrate is sucked in the gap with the substrate and held in the gap.
Even if the adhesive 31A and the particle dispersion 25 have entered between the first columnar part 34 and the second columnar part, the adhesive 31A and the particle dispersion 25 are intermittently separated as described above. The first columnar portion 34 and the second columnar portion 35 that are received by the net are sucked into the gap between the substrate and stay in the gap.

  Therefore, in the present embodiment, in the display medium 102, contact between the adhesive 31 </ b> A constituting the adhesive portion 31 and the particle dispersion 25 constituting the display portion 20 is suppressed. As a result, display defects due to this contact are suppressed.

In the present embodiment, in the display medium 102, the first columnar portion 34 and the second columnar portion 35 are separated from the shortest distance between adjacent first columnar portions 34 and the shortest distance between adjacent second columnar portions 35. However, it arrange | positions shorter than the shortest distance of the 1st columnar part 34 and the 2nd columnar part 35 which adjoin.
As a result, the amount of the invading adhesive 31A increases, and even if the amount of the adhesive 31A held in the gap between one first columnar portion 34 and the substrate exceeds the amount of the first columnar portion 34 located next to it, Is located closer to the second columnar portion, the adhesive 31A overflowing from the gap between one first columnar portion 34 and the substrate is not separated from the gap between the first columnar portion 34 and the substrate located next to each other. It is considered that the liquid is sucked by the capillary phenomenon due to, and stays in the gap and is easily held (see FIG. 15).
Even if the amount of the particle dispersion liquid 25 invading increases and exceeds the amount of the particle dispersion liquid 25 held in the gap between the one second columnar portion 35 and the substrate, the second columnar portion 35 located adjacent to the second columnar portion 35 is larger. Since it is located closer to the first columnar part, the adhesive 31A overflowing from the gap between one second columnar part 35 and the substrate is caused by the gap between the second columnar part 35 located next to the substrate. It is thought that it is sucked by capillary action and stays in the gap and is easily held (see FIG. 15).

  For this reason, in this embodiment, by providing the first columnar portion 34 and the second columnar portion 35 in the above relationship, the adhesive 31A constituting the adhesive portion 31 and the particle dispersion 25 constituting the display portion 20 It becomes easy to suppress the contact. As a result, in comparison with the first embodiment, display failure caused by contact between the adhesive 31A constituting the adhesive portion 31 and the particle dispersion 25 constituting the display portion 20 that occurs when display driving is performed. Will be suppressed.

  In addition, this invention is not restricted to said embodiment, A various deformation | transformation, change, and improvement are possible.

DESCRIPTION OF SYMBOLS 10 Front substrate 11 Back substrate 12 Support substrate 13 Front electrode 14 Support substrate 15 Back electrode 20 Display part 21 Electrophoretic particle 22 Dispersion medium 23 Reflective particle 24 Partition member 25 Particle dispersion 30 Redundant part 31 Adhesive part 31A Adhesive 32 1st wall (Wall for display)
33 2nd wall part (wall part for bonding part)
34 1st columnar part 35 2nd columnar part 40 Electric field formation part 100 Display apparatus 101 Display medium 102 Display medium

Claims (5)

A pair of substrates;
A display unit provided between the pair of substrates, which is composed of a particle dispersion liquid including a migrating particle and a dispersion medium in which the migrating particle is dispersed, and displays the image by moving the migrating particle by an electric field. A display unit;
A first wall portion provided continuously along the periphery of the display portion between the pair of substrates;
An adhesive portion provided continuously along an edge of the pair of substrates between the pair of substrates;
A second wall portion provided continuously along the inside of the bonding portion between the pair of substrates;
Between the first wall portion and the second wall portion between the pair of substrates, the first wall portion is provided in a plurality along the first wall portion and the second wall portion with a space therebetween. A columnar section;
A display medium comprising:   The display medium according to claim 1, wherein a length along the arrangement direction in the first columnar portion is longer than a length along a direction intersecting the arrangement direction.   A second array is provided between the first columnar portion and the first wall portion between the pair of substrates, along the first columnar portion and the first wall portion, and arranged in a plurality at intervals. The display medium according to claim 1, comprising a columnar part.   The shortest distance between the adjacent first columnar portions and the shortest distance between the adjacent second columnar portions are shorter than the shortest distance between the adjacent first columnar portions and the second columnar portions, respectively. 3. The display medium according to 3. The display medium according to any one of claims 1 to 4,
An electric field forming unit that forms an electric field between a pair of substrates provided in the display medium;
A display device comprising:

Images