TW201321881A - Electrophoretic display sheet and electrophoretic display medium using same - Google Patents

Abstract

The purpose of the present invention is to provide the following: a low-cost, high-quality electrophoretic display sheet that is highly durable, exhibits excellent display characteristics, and can be produced with high yield; and an electrophoretic display medium using said electrophoretic display sheet. This electrophoretic display sheet (A) can be obtained, for example, by: using diving walls (15) comprising an insulating material to form a cell structure (20) on a light-transmitting electrode surface (11) formed on a light-transmitting substrate material (10); filling said cell structure (20) with an electrophoretic ink (25); and bonding a film (35) on which an adhesive sealing layer or pressure-sensitive adhesive sealing layer (30) is formed to the top surface of the cell structure (20).

Description

Electrophoretic display sheet and electrophoretic display medium using the same

The present invention relates to an electrophoretic display sheet and an electrophoretic display medium using the same.

In recent years, the demand for low power consumption of display monitors, thinness and light weight, and flexibility have increased, and as one of them, attention has been focused on electronic paper. As one of such electronic papers, an electrophoretic display device using an electrophoretic ink or the like is known.

In general, an electrophoretic display device is configured such that at least one of the two electrode substrates that are transparent to each other is disposed, and electrophoretic ink is disposed between the electrodes disposed in opposite directions to form a display panel. Further, it is a member that is displayed on the transparent electrode surface by applying an electric field to the display panel.

The electrophoretic display device moves the electrophoretic particles in the electrophoretic ink by controlling the direction of the electric field, thereby obtaining a desired display, having a low cost, a wide viewing angle, a general printed matter, a small power consumption, and a display memory property. The strengths.

In such an electrophoretic display device, in the configuration using an electrophoretic display sheet (front plate), an electrophoretic display device in which the electrophoretic display sheet is bonded to various electrode substrates (bottom plates) is known. The electrophoretic display sheet to be used does not need to directly form a partition (rib) on the bottom plate (TFT, segmented substrate, etc.), and can be used in any combination with various kinds of substrates, and can be used in a large area, roll-to-roll. Mass production, no need to match the size of the bottom plate Production, and if necessary, can also be cut off and used. This electrophoretic display sheet is formed on the light transmissive electrode surface of the light transmissive substrate material to form an electrophoretic ink layer.

In the electrophoretic display device thus constructed, for example, in order to manufacture a closed method of an electrophoretic display, it is known that a) includes an array of electrophoretic fluids filled in a microcup type; b) is non-mixed with an electrophoretic fluid contained in the element. And coating the electrophoretic fluid with a solvent or a solvent mixture having a specific gravity which shows a smaller specific gravity than the electrophoretic fluid, and a blocking composition (blocking liquid) of the thermoplastic elastomer; and c) forming a closed layer to close the layer A method of drying a composition (blocking liquid) (for example, refer to Patent Document 1).

However, in this manufacturing method, coating or spraying of a sealing liquid or the like is applied and hardened, but in the case where the electrophoretic fluid has a low specific gravity compared to the sealing composition, it may sink from the surface before the curing of the blocking liquid, and may not be closed. The subject.

On the other hand, in order to provide a substrate having a high-quality image display medium which is excellent in molding precision and which can be formed at a low cost, and has a low density and a high resolution, it is known that there are at least two substrates facing each other. And a manufacturing method of the image display medium of the partition wall provided between the substrates, characterized by comprising a ratio of an end portion width a of the partition wall cross section, an end portion width a on the image display side, and an end portion width b on the side opposite to the image display side ( In the case of a/b), a method of manufacturing an image display medium in which a partition wall is integrally formed at a height of 0.8 or less is used (for example, see Patent Document 2).

In the manufacturing method, when the ratio (a/b) of the end portion width a to the end portion width b on the image display side of the partition wall between the substrates facing at least two sheets is set to 0.8 or less, the partition wall is used. End width facing portrait In the present invention, it is not necessary to directly form a TFT which is a bottom plate, a segment substrate, or the like, in order to ensure the aperture ratio of the image display side and the strength of the partition wall. In the electrode substrate, the electrophoretic display sheet (front plate) is bonded to the bottom plate, and the width of the end portion of the partition wall is narrowed toward the side of the back surface opposite to the image display side, and the sealing property of the electrophoretic ink is improved. The composition of the two technical ideas (constitution and its effects) are different.

[Patent Document]

Patent Document 1: Japanese Laid-Open Patent Publication No. 2005-509690 (Patent Application, Example, FIG. 4, FIG. 5, etc.)

Patent Document 2: Japanese Laid-Open Patent Publication No. 2003-208107 (Application No., Example, FIG. 1, FIG. 7, etc.)

In view of the above-described problems of the prior art, the present invention has an object of providing a low-quality, high-quality electrophoretic display sheet excellent in durability and display characteristics, and an electrophoretic display medium using the same. .

In order to solve the above-mentioned problems and the like, the inventors of the present invention have formed an element-shaped structure formed of a partition wall of an insulating material on the light-transmitting electrode surface of the light-transmitting substrate material. The electrophoretic ink is filled in the element-like structure, and the electrophoretic ink layer is obtained by bonding a film having a specific structure to the electrophoretic ink layer, and the electrophoretic display sheet is obtained by using the electrophoretic display sheet. The substrate was found to have an electrophoretic display medium for the above purpose, and the present invention was completed.

That is, the present invention relates to the following (1) to (16).

(1) An electrophoretic display sheet characterized in that an element-shaped structure formed of a partition wall of an insulating material is formed on a light-transmitting electrode surface of a light-transmitting substrate material, and an electrophoretic ink is filled in the element shape. Inside the structure, a film having a closed adhesive layer or a closed adhesive layer is bonded to the electrophoretic ink layer.

(2) The electrophoretic display sheet according to the item (1), wherein the partition wall of the insulating material faces the closed adhesive layer or the closed adhesive layer from the light-transmitting electrode surface side, and the short-axis width of the partition wall is narrowed. .

(3) The electrophoretic display sheet according to the item (2), wherein the short axis width of the partition wall on the side of the sealing layer or the sealing adhesive layer is smaller than the particle diameter of at least one of the electrophoretic particles contained in the electrophoretic ink layer. By.

(4) The electrophoretic display sheet according to any one of the above aspects, wherein the partition wall of the insulating material is formed with at least one of the gaps having a small particle diameter.

(5) An electrophoretic display sheet characterized in that an element-shaped structure formed of a partition wall of an insulating material is formed on a light-transmitting electrode surface of a light-transmitting substrate material, and an electrophoretic ink is filled in the element shape. Inside the structure, a film formed with a closed precursor layer is attached to the above electricity After the ink layer is swabbed, the closed precursor layer is cured to form a closed layer, and after blocking the electrophoretic ink layer, the film is peeled off from the closed layer.

(6) The electrophoretic display sheet according to the item (5), wherein the partition wall of the insulating material faces the light-transmissive electrode surface side toward the sealing layer, and the short-axis width of the partition wall is narrowed.

(7) The electrophoretic display sheet according to the item (6), wherein the short axis width of the partition wall on the side of the layer to be layered is smaller than the particle diameter of at least one of the electrophoretic particles contained in the electrophoretic ink layer.

(8) The electrophoretic display sheet according to any one of the above-mentioned (5), wherein the partition wall of the insulating material is formed with at least one of the gaps having a small particle diameter.

(9) The electrophoretic display sheet according to any one of the above (5) to (8), wherein an adhesive layer or an adhesive layer is formed on the outer surface of the sealing layer of the electrophoretic display sheet.

(10) An electrophoretic display sheet characterized in that an element-shaped structure formed of a partition wall of an insulating material is formed on a light-transmitting electrode surface of a light-transmitting substrate material, and an electrophoretic ink is filled in the element shape. Inside the structure, a sealing film having an adhesive layer formed thereon is bonded to the electrophoretic ink layer, and the electrophoretic ink layer is sealed by curing the adhesive layer.

(11) The electrophoretic display sheet according to the item (10), wherein the partition wall of the insulating material is directed from the light-transmitting electrode surface side toward the sealing film side, and the short-axis width of the partition wall is narrowed.

(12) The electrophoretic display sheet according to the above (11), wherein In the middle, the short axis width of the partition wall on the side of the closed layer is smaller than the particle diameter of at least one of the electrophoretic particles contained in the electrophoretic ink layer.

(13) The electrophoretic display sheet according to any one of the above-mentioned (10), wherein the partition wall of the insulating material is formed with at least one of the gaps having a small particle diameter.

(14) The electrophoretic display sheet according to any one of the above (10) to (13), wherein an adhesive layer or an adhesive layer is formed on the outer surface of the sealing layer of the electrophoretic display sheet.

(15) An electrophoretic display medium characterized in that the substrate on which one or more electrodes are formed is bonded and formed by peeling off a film of the electrophoretic display sheet according to any one of the above (1) to (4).

(16) An electrophoretic display medium characterized in that the electrophoretic display sheet according to the above item (9) or (14) is bonded to a substrate on which one or more electrodes are formed by an adhesive layer or an adhesive layer.

According to the present invention, it is possible to provide a high-quality electrophoretic display sheet which is low in productivity, superior in productivity and display characteristics, and an electrophoretic display medium using the same.

Hereinafter, each embodiment of the present invention will be described in detail with reference to the drawings. However, in the respective drawings, the same reference numerals indicate the same or equivalent constituent elements.

In the present invention, the electrophoretic display sheet of each embodiment is formed on a light-transmitting electrode surface of a light-transmitting substrate material, and an element-shaped structure formed by a partition wall of an insulating material is formed, and the electrophoretic ink is filled therein. In the inside of the element-shaped structure, the structure of the electrophoretic display sheet of each embodiment is configured by bonding the film of each of the specific structures of the first embodiment to the third embodiment to the electrophoretic ink layer. The electrophoretic display medium is formed by laminating and bonding a thin film of an electrophoretic display sheet of each embodiment such as peeling on a substrate on which one or more electrodes are formed.

(First embodiment, Figs. 1 to 9)

1 to 9 are explanatory views of a first embodiment of the present invention, and Fig. 1 is a schematic longitudinal cross-sectional view showing an electrophoretic display sheet and an enlarged schematic longitudinal cross-sectional view thereof, and Fig. 2 is a view showing a first embodiment for each project. A schematic view of the manufacturing process of the electrophoretic display sheet.

As shown in FIGS. 1 and 2, the electrophoretic display sheet A of the first embodiment has a light transmissive electrode surface 11 formed on the light transmissive substrate material 10, and the light transmissive electrode surface 11 The element-like structure 20 composed of the partition walls 15, 15 of the insulating material, and the electrophoretic ink (layer) 25 filled in the element-like structure 20 are formed with a closed adhesive layer (or closed adhesive layer). Layer 35 of film 35.

The light-transmitting substrate material 10 may have a light transmissive structure, and examples thereof include transparent inorganic materials such as glass, quartz, sapphire, MgO, LiF, and CaF ₂ , and fluorine resin, polyester, and poly. A resin film or ceramic of an organic polymer such as carbonate, polyethylene, polyethylene terephthalate (PET) or polyethylene naphthalate (PEN).

Ideally, in order to produce a roll-to-roll or to increase the area, it is preferable to use a flexible resin film.

For the light-transmitting electrode surface (electrode layer) 11, for example, a transparent conductive material such as ITO, ZnO, or SnO ₂ or aluminum (Al), gold (Au), platinum (Pt), or copper (Cu) may be used. A metal such as silver (Ag), nickel (Ni), or chromium (Cr) is formed. Further, it may be a conductive polymer such as PODET/PVS or PODET/PSS, or a transparent conductive material such as a titanium oxide system, a zinc oxide system or a tin oxide system. These materials can be formed by methods such as vapor deposition, ion plating, sputtering, and the like.

As shown in FIG. 1 and FIG. 2(a), the light-transmitting electrode surface 11 is formed with an element-like structure 20 composed of partition walls 15 and 15 of an insulating material. For example, an insulating resin material such as a PET film having a constant thickness is subjected to laser processing to form a square or hexagonal shape, a circular shape or the like, and the element-like structural body 20 can be formed by being attached to the electrode surface 11 . Further, after the photocurable insulating layer is formed on the electrode surface 11, the element-like structure 20 can be formed by patterning the insulating layer by photolithography. In addition, an insulating insulating resin material is formed on the electrode surface 11 and the element-shaped structure 20 may be formed by a hot press forming method. However, the partition wall 15 has a shape or purpose, and is called a partition wall, a column, a wall, a rib, or the like.

In the present invention, the partition wall 15 of the insulating material has a shape from the side of the light-transmitting electrode surface 11 toward the closed adhesive layer (or the closed adhesive layer) 30. On the side, the shape in which the short-axis width of the partition wall 15 is not narrowed is preferable, and in the present embodiment, the vertical cross-section has a triangular shape (a second-sided triangular shape).

More preferably, the width of the short axis (top) of the partition 15 on the side of the closed adhesive layer (or the closed adhesive layer) 30 is preferably smaller than the particle diameter of at least one of the electrophoretic particles contained in the electrophoretic ink 25 to be described later. Specifically, as shown in FIG. 3( a ), when the electrophoretic ink is filled, the electrophoretic particles are narrowed toward the top portion 15 a side so as not to remain on the top portion 15 a of the partition wall 15 . When the electrophoretic ink is filled, as shown in Fig. 3 (b), when the electrophoretic particles remain on the width of the top portion 15b of the partition wall 15, the barrier becomes the barrier to the closing of the adhesive layer (or the closed adhesive layer) 30. It is necessary to remove the electrophoretic particles (clearing), but as shown in Fig. 3 (a), the width of the short axis (top) 15a of the partition 15 is preferably smaller than the particle diameter of at least one of the electrophoretic particles to be used. When the minimum particle diameter of the electrophoretic particles is small, the removal (clearing) of the electrophoretic particles can be omitted, and since the top portion 15a penetrates the closed adhesive layer (or the closed adhesive layer) 30, the manufacturing time can be suppressed. It is offset, and because it can also obtain the contact area, it is a superior structure for sealing. However, 26 and 27 in Fig. 3 show electrophoretic particles, 26-series black particles (containing carbon black resin particles), and 27-series white particles (titanium oxide particles).

The longitudinal cross-sectional shape of the partition wall 15 as the insulating material may be a shape in which the minor axis width of the partition wall 15 is narrowed toward the closed adhesive layer (or the closed adhesive layer) 30 side, and for example, FIG. 4 (a) ) ~ (d) each longitudinal section shape and so on. In the case of these shapes, the tops 15a of the respective partitions 15 The width is also smaller than the particle diameter of at least one of the electrophoretic particles to be used, and it is particularly preferable that the smaller particle diameter of the electrophoretic particles is smaller.

In addition, as shown in FIG. 1(b), the short-axis length X of the electrode surface 11 side of the partition wall 15 is changed by electrophoretic ink, electrophoretic display medium, etc., but 20 μm is provided in order to sufficiently ensure the aperture ratio of the display surface. The following are preferred. Further, the height of the partition wall 15 is preferably a height higher than the height Y of the electrophoretic ink layer 20 to be filled: 20 to 40 μm.

The element-like structures 20 in which a plurality of small compartments (elements 16, 16...) are formed are formed via the partition walls 15, 15, ... which are erected on the electrode surface 11 having the above-described light transmittance. These elements 16 are separated by the partition walls 15, and may be provided in various shapes such as a circular shape, a rectangular shape (rectangular shape, a square shape), and a hexagonal shape.

FIG. 5 and FIG. 6 are diagrams showing an example of the element-like structure 20 composed of the partition walls 15 and 15 which are in the form of a triangular shape (a binary triangle shape) through the longitudinal section, and other examples. 5 shows a view of the well-shaped element-shaped structural body 20, and FIG. 6 shows a hexagonal-shaped element-shaped structural body 20.

The element-like structure 20 formed on the electrode surface 11 is filled with the electrophoretic ink 25 as shown in Fig. 2(b). The method of filling the electrophoretic ink 25 is, for example, a coating by a die coater or the like, or an electrophoretic ink 25 disposed at any position of the electrode substrate, via a bar coating device, a doctor blade, and a knife roll coating. The cloth machine or the like is slightly contacted and spread, and various methods can be used by a printing method such as screen printing or a method of filling the ink into the element by inkjet or filling with a dispenser.

The electrophoretic ink 25 to be used is not particularly limited, and for example, it may have a configuration in which at least one type of electrophoretic particles and a solvent such as a solvent are contained.

For the electrophoretic particles that can be used, for example, inorganic pigment particles, organic pigment particles, and polymer fine particles, which are colored or colorless (white), may be used, and these may be used alone or in combination of two or more. Further, it may be a composition of fine particles treated with a lipophilic surface.

As an example of the electrophoretic ink 25 which can be used, it can be formed by positively charged white particles, negatively charged black particles, and a solvent (solvent) for dispersing such particles. As the white particle system, a white pigment such as titanium oxide, a white resin particle, or a white resin particle or the like can be used. As the black particle system, a black pigment such as black titanium or carbon black, or a resin particle colored in black or the like can be used. These particles may be arbitrarily used as particles in various colors, and may be used as a combination of white and red, white and blue, yellow and black, and the like. Further, it may be a configuration of only one type of charged particles using only white particles or black particles.

These electrophoretic particles are preferably composed of an average particle diameter of 0.05 to 20 μm, and particularly preferably have an average particle diameter of 0.1 to 10 μm.

In addition, the total content of such fine particles is preferably 5 to 95% by mass, and more preferably 10 to 80% by mass, based on the total amount of the electrophoretic ink.

In addition, as a solvent, for example, a hydrocarbon-based, aromatic-based, ester-based, ketone-based, terpene-based, alcohol-based, polyfluorinated, or fluorin-based solvent may be used alone or in combination of two or more types. And the user. As such a solvent The content of the electrophoretic ink may be appropriately selected in accordance with the electrophoretic particles or the solvent to be used. The total amount of the electrophoretic ink is preferably 20 to 80%, more preferably 35 to 65%.

In addition, the electrophoretic ink 25 contains one or more types of electrophoretic particles and a solvent, and further contains a dispersing agent, and a charge control agent may be used. Examples of the dispersing agent that can be used include various dispersing agents, surfactants, and polymeric surfactants which are conventionally used, for example, nonionic surfactants, anionic surfactants, and cationic surfactants, both sexes. It is a surfactant, a polymer type surfactant, etc., but it is not limited to these. The content of the dispersing agent is appropriately determined depending on the electrophoretic particles or the solvent to be used. However, the total amount of the electrophoretic ink is preferably 0.01 to 50.0%, more preferably 0.5 to 30. It is better to contain %.

As the charge control agent, various forms of the conventional electrophoretic ink can be used.

When the electrophoretic ink 25 is filled, it is preferable to form the surface of the substrate 10, and the electrophoretic ink 25 may have a wettability adjustment project which improves the wettability. The inner wall or the corner portion of the plurality of elements 16, 16, ... formed by the insulating partition wall 15 sufficiently spreads the electrophoretic ink 25, and the gas such as air is supplied from the insulating partition wall 15 , 15 . It is an ideal project to release a plurality of components 16, 16 which are formed.

Examples of the wettability adjusting engineering system include solvent treatment, oxygen treatment, alkali treatment, ozone treatment, plasma treatment, corona discharge treatment, UV treatment, UV adhesion lifting surface treatment (UV ITRO treatment), and Ray. Shoot Treatment, treatment by electron beam, treatment by ion implantation, treatment by ion beam, treatment by ion irradiation, promoter treatment, surfactant treatment, treatment by sputtering (physical vapor phase growth method), CVD (Chemical vapor phase growth method), a method of forming a polymer layer, and forming an inorganic layer. These may be used in combination of plural numbers, and are not limited thereto.

In addition, in order to remove the contamination on the surface of the substrate in advance, the wettability can be more effectively adjusted by performing a treatment such as washing with a solvent, for example, by washing with an alcohol or the like.

Further, when the electrophoretic ink 25 is filled, the gas dissolved in the electrophoretic ink 25 or the air entrapped in the electrophoretic ink 25 is filled in the display region as much as possible without mixing or leaving air or the like in the display region before filling, at the time of filling, or after filling. It is preferable that the degassing is sufficiently performed and removed (the ambient atmosphere is used as a reduced pressure environment). Specifically, the filling process is carried out under a reduced pressure environment or, after coating, under a reduced pressure environment. Thereby, the voids in the electrophoretic ink 25 or the replacement of the air in the element and the electrophoretic ink 25 are promoted, and the possibility of residual bubbles in the panel can be reduced, and the sealing substrate and the sealing layer to be described later are formed ( Or, after the film 35 of the adhesive layer 30 is closed (after sealing), the formation of the bubble is suppressed.

As a method of deaerating before filling, for example, a method of stirring the electrophoretic ink 25 with a stirring bar or the like, a method of heating, a method of heating while stirring, and a method of decompressing by means of ultrasonic waves may be mentioned. A method of adding an additive such as an antifoaming agent or the like by a method of centrifugal force, but is not limited thereto. Moreover, these methods can also be combined with the user.

In the first embodiment, the film 35 having the closed adhesive layer (or the closed adhesive layer) 30, which will be described later, is bonded to the upper surfaces of the partition walls 15, 15, ... even if the above-described degassing process is performed. The internal pressure changes when the load or temperature changes, and the elements 16 separated by the element-like structure 20 also become decompressed. As shown in FIG. 7, bubbles are easily generated (vacuum state, solvent saturation state). ) 17,17... Therefore, as shown in FIGS. 8(a) and 8(b), the particle diameter included in at least one of the electrophoretic inks 25 is formed in a portion where the partition walls 15, 15 of the insulating material intersect, and it is particularly preferable to perform electrophoresis. It is preferable that the minimum particle diameter of the particle diameter is a small gap formed by the communicating holes 18, 18... Although the electrophoretic particles are not pierced, the local pressure changes inside the respective elements 16 are dispersed by the movement of the solvent when the communication holes 18, 18 are formed by the gap in which the solvent is formed, and are uniformly alleviated. It is not easy to generate bubbles, and it is a structure that can improve the display characteristics. Further, although the above-mentioned gap is smaller than the particle diameter of one of the other particles, the larger particle diameter is larger, and the larger one of the particles blocks the gap, and does not cause a small influence on the display. The mover of the particle. It is preferable that the communication hole formed by the small gap is formed in a portion where the partition walls 15 and 15 of the insulating material intersect, but it is also a communication hole which can be formed by providing a small gap outside the intersection portion.

Fig. 8(a) shows a portion 18, 18 which is intersected by the partition walls 15, 15 of the insulating material in the element-like structure (hexagonal body) 20 which is formed by the partition walls 15, 15, ..., a diagram of the communication holes 18, 18... formed by the gaps of the above characteristics. Fig. 8(b) is an insulating material in an element-like structure (well shape body) 20 which is formed by the partition walls 15, 15, The respective units of the portions where the partition walls 15, 15 are intersecting each other form a map of the communication holes 18, 18, which are formed by the gaps of the above characteristics.

In the first embodiment, as shown in FIG. 2(c), the electrode surface 11 of the electrophoretic ink 25 is filled, and a sealing layer (or a closed adhesive layer) in which the electrophoretic ink 25 disposed oppositely is disposed is closed by lamination. When the film 35 of the layer 30 is on the top of each of the structures 15, an electrophoretic display sheet A for the purpose can be obtained.

The closed adhesive layer (or the closed adhesive layer) 30 can be sealed so as not to expose the electrophoretic ink from the element, and is not particularly limited as long as it can be adhered to (or adhered to) the substrate to be described later. However, for example, a polymer or a polymer precursor material which is a high dielectric constant, low volume inherent resistance material such as polyvinylidene fluoride, polyurethane, nitrocellulose, cellulose acetate or the like is preferred. Further, in order to further increase the dielectric constant, the above polymer is used as a base polymer, and an alkyl group such as tetrabutylammonium hydrogen sulfate (TBAHS) or tetrabutylhexafluorophosphate (TBAHP) is blended in a specific ratio. A fourth-order ammonium salt, a fine particle barium titanate, barium titanate or the like may be used. Further, as the material, various materials such as ultraviolet curability, thermoplasticity, thermosetting type, two-liquid curing type, moisture curing type, and catalyst curing type can be used.

Further, after the polymer solution dissolved in the solvent is applied to the film, the excess solvent may be removed and used.

It is preferable that the above materials are appropriately combined as a closed adhesive layer (or a closed adhesive layer) 30 having a volume specific resistance of 10 ⁸ to 10 ¹⁴ Ωcm and a dielectric constant of 3 to 11.

The thickness of the closed adhesive layer (or closed adhesive layer) 30 varies depending on the volume specific resistance of the electrophoretic ink used, the value of the dielectric property, and the height of the electrophoretic ink layer, but a sufficient voltage can be applied to the electrophoretic ink. In order to close the electrophoretic ink, it is preferably 1 to 10 μm, more preferably 0.5 to 5 μm.

In addition, the film 35 to be used is a film for peeling, and it can be used for coating a surface of PET, PE, paper, etc., and a so-called release sheet such as a polyfluorinated release agent or a fluorine-based release agent. The release film, the release paper, and the like are suitably determined in combination with the closed adhesive layer (or the closed adhesive layer) to be used.

The method of forming a closed adhesive layer (or a closed adhesive layer) on the above-mentioned film may be, for example, a method in which a solvent is dissolved in a liquid of an organic solvent by using a coater, and then an excess solvent is removed, or a method in which a polymer precursor material of a monomer or an oligomer is applied to a film at the same time as a catalyst, and then formed by polymerization using heat or light, or a photocurable material is applied to the film. After the above, the light is irradiated and formed as a semi-hardened state (a state in which it is not subjected to irradiation with a degree of complete hardening, and has a viscosity or a viscous state), but is not limited thereto. Further, it is also possible to use a combination of a thermoplastic material and a photocurable material, or a combination of two or more types of a combination of a thermosetting material and a photocurable material.

The closed adhesive layer (or closed adhesive layer) 30 has a function of blocking the electrophoretic ink inside the element by bonding with the partition wall, and has the viscosity, hardness, etc. from the film leaving the electrophoretic ink, and not sinking. It also has the function of following the bottom plate described later. Accordingly, it is possible to appropriately adjust the thickness, viscosity, viscosity, hardness, and the like of the closed adhesive layer (or the closed adhesive layer) having the above-described functions.

As the substrate 10 on which the electrode 11 for filling the electrophoretic ink 25 is formed, a film 35 having a closed adhesive layer (or a closed adhesive layer) 30 that closes the above-described characteristics of the electrophoretic ink 25 disposed oppositely is attached to each of the partition walls. 15 The method of the above, for example, after fitting one end of the film 35 having the closed backing layer (or the closed adhesive layer) 30, by closing the roller between the opposing rollers, the sealing layer (or the closed adhesive layer) 30 is closed. The electrophoretic display medium sheet A shown in Fig. 1 can be obtained by being bonded to the upper surfaces of the partition walls 15.

In this case, the bonding as a bonding can be carried out by pressurization, heating, or light irradiation through a roller.

As described above, after various adjustments, after forming a closed adhesive layer (or a closed adhesive layer) on the film, the electrophoretic ink is smaller than the closed adhesive material (or the closed adhesive material) by being attached to the upper surface of each partition wall 15. In the case, it is also possible to close the surface from the surface, and the material (or the closed adhesive material) does not sink.

Further, in the first embodiment, the electrophoretic display medium can be produced by peeling off the thin film 35 of the obtained electrophoretic display sheet A by laminating an electrode substrate (backplane) in which one or more electrodes are formed, and further, if The control unit or the like can obtain an electrophoretic display device.

Examples of the substrate on which one or more electrodes are formed include a TFT substrate, a segmented substrate, a planar substrate, and the like, which are used in conventional electronic paper or electrophoretic display. The various electrode substrates of the device are shown.

9 is a peeling film 35 (see FIG. 9(a)) of the electrophoretic display medium sheet A obtained by peeling off, for example, by bonding a TFT substrate 60 to be a bottom plate to a closed adhesive layer (or a closed adhesive layer) 30. Sometimes you can make an electrophoretic display media.

In this case, the bonding as a bonding can be carried out by pressurization, heating, or light irradiation through a roller.

However, corresponding to the use of the electrophoretic display medium (use, rewriting method, etc.), it is also possible for the substrate and other light transmissive electrodes, non-light transmissive electrodes, resin films, resins, wood, metals, ceramics, paper, cloth. And / or glass fitters.

In the case where a resin film is used for the substrate, the effect can be increased when the resin film or other substrate is bonded to the solvent-inhibiting effect or the gas permeation suppressing effect.

In addition, in order to improve the strength of the electrophoretic display device, it is also possible to bond the other substrate to the reinforcing member, or to decorate the display device, and to bond the paper or the cloth as another substrate.

(Second embodiment, Fig. 10 to Fig. 12)

10 to 12 are explanatory views for explaining a second embodiment of the present invention.

In the electrophoretic display sheet of the second embodiment, only the film 35 having the closed adhesive layer (or the closed adhesive layer) 30 formed in the first embodiment is used, and the film 45 on which the closed precursor layer 40 is formed is bonded to the film 45. Electricity After the ink layer 25 is formed, the sealing layer 41 is formed by curing the sealing precursor layer 40, and after the electrophoretic ink layer 25 is closed, the dots formed by peeling the film 45 from the sealing layer 41 are different, and the substrate material 10 is The electrode surface 11, the partition wall 15, the element-like structure 20, and the electrophoretic ink (layer) 25, and FIGS. 3 to 8 and the description thereof (the short-axis width of the partition 25 is narrowed, and the short-axis width of the partition wall is The particle diameter of at least one of the electrophoretic particles is smaller, and the gap having at least one of the particle diameters is smaller than that of the electrophoretic display sheet of the first embodiment, and the description thereof is omitted. . In the drawings, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and their description will be omitted.

As shown in FIGS. 10 and 11, the electrophoretic display sheet B of the second embodiment has a light transmissive electrode surface 11 formed on the light transmissive substrate material 10, and the light transmissive electrode surface 11 The element-like structure 20 including the partition walls 15 and 15 of the insulating material, and the electrophoretic ink (layer) 25 filled in the element-like structure 20, and the film formed with the closed precursor layer 40 are formed. 45.

In the second embodiment, as shown in Fig. 11(c), a film of the closed precursor layer 40 in which the precursor material of the electrophoretic ink 25 disposed oppositely is disposed is formed on the electrode surface 11 of the electrophoretic ink 25 is filled. 45. After being bonded to the upper surface of each structure 15, the sealing layer 41 is formed by curing the sealing precursor layer 40, and after closing the electrophoretic ink layer 20, the film is peeled off from the sealing layer 41 as shown in FIG. 11(d). At the time of 45, the electrophoretic display sheet B of the object can be obtained.

The closed precursor layer 40 is formed by curing to form the sealing layer 41, and is not particularly limited as long as it can be blocked by electrolysis so that the electrophoretic ink does not leak out of the element. For example, epoxy acrylate can be used. Thermosetting resin such as urethane acrylate, urethane ethyl ester or the like, ultraviolet curable resin, phenol resin, urea resin, melamine resin, unsaturated polyester resin, epoxy resin, polyurethane resin, etc. Two kinds of materials such as a two-liquid hardening type resin such as a two-partic acid urethane group, a water-curing type resin such as a moisture-curable urethane resin, or a catalyst hardening type resin such as an epoxy or an isocyanate.

Further, after the material solution of the blocked precursor dissolved in the solvent is applied to the film, the excess solvent may be removed and used.

Further, the alkyl fourth ammonium salt such as tetrabutylammonium hydrogen sulfate (TBAHS) or tetrabutylhexafluorophosphoric acid (TBAHP), fine particles of barium titanate, barium titanate or the like is adjusted by a specific ratio. The dielectric constant or the volume specific resistance may be used.

It is preferable that the above materials are appropriately combined as the closed precursor layer 40 having a volume specific resistance of 10 ⁸ to 10 ¹⁴ Ωcm and a dielectric constant of 3 to 11.

The thickness of the closed precursor layer 40 varies depending on the volume specific resistance of the electrophoretic ink used, the value of the dielectric ratio, and the height of the electrophoretic ink layer, but a sufficient voltage can be applied to the electrophoretic ink, and in order to block the electrophoretic ink, The ideal system is preferably 1 to 10 μm, more preferably 0.5 to 5 μm.

Moreover, the film 45 used is the same as the above-described first embodiment. The composition of the film for peeling can be applied to a surface of PET, PE, paper, etc., and a so-called release sheet such as a polyfluorene-based release agent or a fluorine-based release agent, a release film, and a release paper. Etc., suitably combined with the closed adhesive layer (or closed adhesive layer) used.

The method of forming the sealing precursor layer 40 on the above-mentioned film may be, for example, a method in which a solvent for dissolving a polymer material in an organic solvent is applied by a coater to remove excess solvent, or a monomer or an oligo. a polymer precursor material of a polymer formed by applying a catalyst to a film at the same time, or applying a photocurable material to the film, and irradiating the light to be in a semi-hardened state (not to make it completely hardened) The method of forming the light or the viscous state, but is not limited thereto. Further, it is also possible to use a combination of a thermoplastic material and a photocurable material, or a combination of two or more types of a combination of a thermosetting material and a photocurable material.

The closed precursor layer 40 has a function of not adhering to the electrophoretic ink from the film, and the viscosity, hardness, and the like of the degree of sinking, and having a function of bonding the electrophoretic ink to the inside of the element after bonding to the partition wall after hardening. Accordingly, it is possible to appropriately adjust the thickness, viscosity, viscosity, hardness, and the like of the closed precursor layer having the above functions.

As a substrate 10 on which the electrode 11 for charging the electrophoretic ink 25 is formed, a film 45 having a closed precursor layer 40 that closes the above-described characteristics of the electrophoretic ink 25 disposed oppositely is bonded to the upper surface of each partition wall 15 For example, after mating one end of the film 45 having the closed precursor layer 40, the precursor layer 40 will be closed by passing between the opposing rollers. After being bonded to the upper surfaces of the partition walls 15, the sealing layer 41 which seals the electrophoretic ink layer 25 by curing the closed precursor layer 40 is formed, and as shown in FIG. 11(d), the electrophoretic display medium can be obtained by peeling off the film 45. Sheet B.

In this case, the bonding as a bonding can be carried out by pressurization, heating, or light irradiation through a roller.

As described above, after the various adjustments are made, after the closed precursor layer 40 is formed on the film, when the film is bonded to the upper surface of each of the partition walls 15, the electrophoretic ink has a smaller specific gravity than the closed precursor material, and is also capable of being closed from the surface. The precursor material did not sink and closed.

Further, in the second embodiment, on the outer surface of the closed layer 32 of the obtained electrophoretic display sheet B, as shown in Fig. 12(b), an adhesive layer (or adhesive layer) 46 is formed, and more than one or more are formed via bonding. The electrode substrate (bottom plate) of the electrode can be used to produce an electrophoretic display medium, and an electrophoretic display device can be obtained by providing a control unit or the like.

The adhesive layer (or adhesive layer) 46 is the same as that of the above-described first embodiment, and the description thereof will be omitted.

The peeling film 45 of the obtained electrophoretic display medium sheet B is peeled off as shown in FIG. 12(a), and then an adhesive layer (or adhesive layer) 46 is formed on the outer surface of the sealing layer 41, for example, the first one described above. In the same manner, an electrophoretic display medium can be produced by bonding the TFT substrate 60 serving as a substrate to the adhesive layer (or adhesive layer) 46.

In this case, the bonding as a bonding can be carried out by pressurization, heating, or light irradiation through a roller. However, the use of electrophoretic display media The use, the rewriting method, and the like are the same as in the first embodiment described above, and the description thereof will be omitted.

In the electrophoretic display sheet B according to the second embodiment of the present invention, it is a high-quality electrophoretic display sheet which is low in productivity and excellent in productivity and display characteristics, and an electrophoretic display medium using the same. Composition. In the second embodiment, in particular, a large-area electrophoretic display sheet B excellent in durability or display characteristics can be mass-produced in roll-to-roll, and can be produced without the size of the bottom plate, and can be made necessary. Cut off simply.

In addition, the electrophoretic display device obtained by electrophoretic display of the sheet B can realize high-contrast display, and has high reliability and can be displayed in contrast in repeated display, and is excellent in responsiveness, and has little deterioration in display characteristics. The composition.

(Third embodiment, Fig. 13 to Fig. 15)

13 to 15 are explanatory views for explaining a third embodiment of the present invention.

The electrophoretic display sheet according to the third embodiment is only a film 35 having a closed adhesive layer (or a closed adhesive layer) 30 formed in the first embodiment, and a closed precursor used in the second embodiment. The film 45 of the bulk layer 40 has a structure in which the film 55 having the adhesive layer 50 is bonded to the electrophoretic ink layer 25, and the layer of the electrophoretic ink layer 25 is closed by curing the adhesive layer 50, and the substrate material 10 is different. , electrode face 11, partition 15, component-like structure 20, electrophoretic ink (layer) In the configuration of the second embodiment, as shown in FIG. 3 to FIG. 8 and the description (the configuration in which the short-axis width of the partition wall 25 is narrowed, the short-axis width of the partition wall is smaller than the particle diameter of at least one of the electrophoretic particles, and the partition wall system is formed. The reason why the at least one of the particles has a small particle diameter is the same as that of the electrophoretic display sheet according to the first embodiment described above, and the description thereof will be omitted. In the drawings, the same components as those of the first embodiment are denoted by the same reference numerals, and their description will be omitted.

As shown in FIG. 13 and FIG. 14 , the electrophoretic display sheet C according to the third embodiment of the present invention has a light transmissive electrode surface 11 formed on the light transmissive substrate material 10, and an electrode for the light transmissive electrode. The surface 11 has an element-like structure 20 composed of partition walls 15 and 15 of an insulating material, an electrophoretic ink (layer) 25 filled in the element-like structure 20, and an adhesive layer 50 formed thereon. The film 55 is closed.

In the third embodiment, as shown in FIG. 14(c), the sealing film 55 on which the adhesive layer 25 of the electrophoretic ink 25 disposed oppositely is disposed is attached to the electrode surface 11 of the electrophoretic ink 25, and is bonded thereto. After the upper surface of each structure 15, the electrophoretic ink layer 25 is sealed by curing the adhesive layer 50, whereby the intended electrophoretic display sheet C can be obtained.

Then, the layer 50 is followed by the partition wall 15 and the sealing film 55, and is not particularly limited as long as it can be adhered to the sealing film to such an extent that the electrophoretic ink does not leak out of the element, for example, polyurethane, nitrocellulose. Preferably, the polymer or polymer precursor material of cellulose acetate or the like is preferred. In addition, the above polymer is used as a base polymer, and tetrabutylammonium hydrogen sulfate (TBAHS), tetrabutyl hexafluorophosphate is further formulated by a specific ratio. An alkyl group fourth ammonium salt such as an amine (TBAHP), a fine particle barium titanate, barium titanate or the like may be used. Further, as the material, various materials such as ultraviolet curability, thermoplasticity, thermosetting property, two-liquid curing type, moisture curing type, and catalyst hardening type can be used.

Further, after the polymer solution dissolved in the solvent is applied to the sealing film 55, the excess solvent may be removed and used.

It is preferable that the above materials are appropriately combined as the adhesive layer having a volume specific resistance of 10 ⁸ to 10 ¹⁴ Ωcm and a dielectric constant of 3 to 11.

The thickness of the adhesive layer 50 varies depending on the volume specific resistance of the electrophoretic ink used, the value of the dielectric constant, the height of the electrophoretic ink layer, and the thickness of the sealing film, but a sufficient voltage can be applied to the electrophoretic ink, and Next, the electrophoresis ink is sealed by the partition wall 15 and the sealing film 55, and it is preferably 1 to 10 μm, more preferably 1 to 5 μm.

The sealing film 55 to be used is not particularly limited, but a film material made of a high dielectric constant material or a low volume inherent resistance material is preferred. For example, a polymer film such as a polyvinylidene chloride film, a polyvinylidene fluoride film, a polyurethane film, a nitrocellulose film, or a cellulose acetate film may be mentioned.

It is preferable to use a polyvinylidene fluoride monomer film, a vinylidene fluoride copolymer film having a ratio of 50% by mass or more, a polyurethane film or the like.

Further, a composition containing various additives can be used for each of the above-mentioned film systems to be used. As various additives, a suitable content of phthalic acid ester, adipate, citrate, phosphate, and sebacic acid can be mentioned. Butyl acrylate (DBS), plastic bismuth citrate (ATBC), etc.; epoxy linoleic oil, epoxy linseed oil, bisphenol A diglycidyl ether bromide, epoxidized polybutadiene, An epoxy compound such as octyl octadecanoate; an antioxidant such as vitamin E, butylhydroxytoluene (BHT) or alkyl thiodipropionate; sodium pyrophosphate, sodium tripolyphosphate, sodium diamine 4 acetate (EDTA-2Na), an alkyl 4th ammonium salt such as tetrabutylammonium hydrogen sulfate (TBAHS) or tetrabutylhexafluorophosphoric acid (TBAHP), a metal oxide of a fine particle barium titanate or barium titanate, Thermal stabilizers such as magnesium oxide; various light stabilizers; various slip agents; various colorants; flame retardants, UV absorbers, etc. One part of these additives may be added simultaneously with the polymer of the polymer of the dichloroethylene copolymer or may be added during the polymerization.

It is preferable to contain 1 to 30% by mass of each of the above materials in the above film.

The thickness of the sealing film 55 is varied by the volume specific resistance of the electrophoretic ink used, the value of the dielectric ratio, the height of the electrophoretic ink layer, and the thickness of the layer, but a sufficient voltage can be applied to the electrophoretic ink, and The electrophoretic ink is sealed, and it is preferably 1 to 20 μm, more preferably 5 to 10 μm.

Further, the sealing film 55 is preferably a structure having a volume specific resistance of 10 ⁸ to 10 ¹⁴ Ωcm and a dielectric constant of 3 to 11.

The method of forming the adhesive layer 50 on the above-mentioned sealing film may, for example, be a method of applying a coating machine to dissolve a liquid of a polymer material in an organic solvent, removing excess solvent, or forming a monomer or an oligo. a polymer precursor material of the polymer, which is applied to the sealing film simultaneously with the catalyst a method of forming a method in which a photocurable material is applied to a film, and then irradiated with light to form a semi-hardened state (not in a state of being completely cured, having a viscosity or a viscous state), but It is not limited to this. Further, it is also possible to use a combination of a thermoplastic material and a photocurable material, or a combination of two or more types of a combination of a thermosetting material and a photocurable material.

Next, the layer 50 has a function of enclosing the electrophoretic ink in the inside of the element following the partition wall and the closing film, and has a configuration in which it is separated from the sealing film and dissolved in the electrophoretic ink, and is not sag. Accordingly, the thickness, viscosity, viscosity, hardness, and the like of the adhesive layer are appropriately adjusted to have the above-described functions.

As a method of forming a sealing film 55 having a bonding layer 50 that closes the above-described characteristics of the electrophoretic ink 25 disposed oppositely to the substrate 10 on which the electrophoretic ink 25 is filled, a method of bonding the sealing film 55 to the upper surface of each of the partition walls 15 is used. For example, after fitting one end of the closed film 55 having the adhesive layer 50, after the adhesive layer 50 is placed on the respective partition walls 15 by being disposed between the opposing rollers, the electrophoresis is blocked by hardening the adhesive layer 50. The ink layer 25 is formed to obtain the electrophoretic display medium sheet C shown in Fig. 15.

In this case, the bonding as a bonding can be carried out by pressurization, heating, or light irradiation through a roller.

As described above, after the various adjustments are made, after the adhesive layer 50 is formed on the sealing film 55, the electrophoretic ink is smaller than the thickness of the adhesive layer when it is bonded to the upper surface of each of the partition walls 15, and is also capable of being closed from the surface. Then the layer material does not sink and close.

Further, in the third embodiment, on the outer surface of the closed film layer 55 of the obtained electrophoretic display sheet C, as shown in Fig. 15, an adhesive layer (or adhesive layer) 56 is formed, and more than one electrode is formed via bonding. An electrophoretic display medium can be produced by using the electrode substrate (bottom plate), and an electrophoretic display device can be obtained by providing a control unit or the like.

The adhesive layer (or adhesive layer) 56 is, for example, a material that can be adhered to (or adhered to) the bottom plate, and is not particularly limited, but is, for example, a high dielectric constant, a low-volume inherent resistance material. A polymer or polymer precursor material of vinyl fluoride, polyurethane, nitrocellulose, cellulose acetate or the like is preferred. Further, in order to further increase the dielectric constant, the above polymer is used as a base polymer, and an alkyl group such as tetrabutylammonium hydrogen sulfate (TBAHS) or tetrabutylhexafluorophosphate (TBAHP) is blended in a specific ratio. A fourth-order ammonium salt, a fine particle barium titanate, barium titanate or the like may be used. Further, as the above-mentioned material, various materials such as ultraviolet curability, thermoplasticity, thermosetting property, two-liquid curing type, moisture curing type, and catalyst curing type can be blended in a specific ratio. Further, the thickness of the adhesive layer (or adhesive layer) 56 is preferably 1 to 10 μm, more preferably 1 to 5 μm.

In the same manner as in the above-described first embodiment, a substrate such as a TFT substrate, a segmented substrate, or a planar substrate used in various conventional electronic paper or electrophoretic display devices can be used.

Figure 15 is a closed film of the obtained electrophoretic display medium sheet C After forming the adhesive layer (or adhesive layer) 56 on the outer surface of 55, for example, an electrophoretic display medium can be produced by bonding the TFT substrate 60 serving as the substrate to the adhesive layer (or adhesive layer) 56. In this case, the bonding as a bonding can be carried out by pressurization, heating, or light irradiation through a roller. However, the use (the use, the rewriting method, etc.) of the electrophoretic display medium is the same as that of the above-described first embodiment, and the description thereof will be omitted.

In the electrophoretic display sheet C according to the third embodiment of the present invention, it is a high-quality electrophoretic display sheet which is low in productivity and excellent in durability and display characteristics, and an electrophoretic display medium using the same. Composition. In the third embodiment, in particular, a large-area electrophoretic display sheet excellent in durability or display characteristics can be produced in a large amount by roll-to-roll, and can be produced without the size of the bottom plate, and can be cut as necessary. Simply use it.

In addition, the electrophoretic display device obtained by electrophoretic display of the sheet can realize high-contrast display, and has high reliability and can be displayed in contrast when repeatedly displayed, and is excellent in responsiveness, and has little deterioration in display characteristics. Composition.

The present invention is constructed as described above, but is not limited to the configuration of each of the above embodiments, and various modifications can be made without departing from the scope of the present invention.

Example

Next, embodiments suitable for carrying out the invention are shown, but the invention is not limited thereto.

[Examples 1 to 4, the first embodiment, according to Figs. 1 to 10] (Example 1)

The electrophoretic display sheet and the electrophoretic display medium were obtained through the following items.

1) Engineering of a plurality of components formed by forming an insulating partition wall on an electrode substrate

As the electrode substrate, a 125 μm thick PET sheet (10 × 10 cm) formed of a transparent material ITO film having a surface resistance of about 300 Ω/□ was used.

On the first electrode substrate, an acrylic UV curable resin material is applied to have a thickness of 40 μm, and then a plurality of grid-like elements (height) formed by UV exposure and development to form an insulating partition wall are formed. 40 μm, component size 300 × 300 μm). The longitudinal cross-sectional shape of the partition wall: a quadrilateral triangular shape, a bottom edge = 20 μm, a height = 40 μm, and a top width: 2 μm or less.

2) Engineering of filling electrophoretic ink into components

The composition of the electrophoretic ink to be used is 75 mass% of n-dodecane, and the volume average particle diameter of the titanium oxide particles (measured by a particle size analyzer (manufactured by Nikkiso Co., Ltd.): about 1 μm] 10% by mass, and the carbon black contains acrylic acid. Particles (in the case of Mac-View (made by Japan Mountech Co., Ltd.), the average particle diameter when the image was enlarged by an electron microscope: about 6 μm) 10% by mass, hydroxyethylamine 3 % by mass, sorbitan trioleate 2% by mass.

This electrophoretic ink was filled in the above element using an applicator.

3) Engineering of attaching and filming with an electrode substrate and a closed adhesive layer (or a closed adhesive layer)

As a closed adhesive layer (or a closed adhesive layer), an ultraviolet curable urethane acrylate resin adjusted with a viscosity of butyl acetate was applied onto a polyethylene film (10×10 cm) having a thickness of 125 μm, and then removed. Butyl acetate was formed to have a thickness of 8 μm.

The electrode substrate filled with the electrophoretic ink is bonded to one end of a film having a closed adhesive layer (or a closed adhesive layer), and then laminated between the opposing rollers to obtain an electrophoretic display sheet.

No bubbles were mixed in the display region of the obtained electrophoretic display sheet, and the interval between the electrode and the film having the closed adhesive layer (or the closed adhesive layer) was uniform.

Further, the obtained electrophoretic display sheet was bonded to a substrate (a 0.7 mm glass substrate on which a planar electrode of ITO was formed), and ultraviolet rays were irradiated from the substrate side to cure the ultraviolet curable urethane acrylate resin. Thereafter, by applying a voltage of +50 V and -50 V between the two electrodes, it is confirmed that a black-and-white display capable of high contrast can be confirmed.

Further, when the display performance of the obtained electrophoretic display medium after drying for one month at 50 ° C was evaluated, no change in the initial display performance was observed, and an electrophoretic display medium which was extremely resistant to display deterioration was obtained. . In addition, no bubbles were observed in the element.

(Example 2)

In the first embodiment described above, a configuration in which a gap of about 5 μm is formed in a portion where the insulating partition walls intersect is formed.

(Example 3)

In the first embodiment, the composition of the electrophoretic ink to be used is 78% by mass of n-dodecane, and the titanium oxide contains polyethylene particles (analyzed by Mac-View (made by Japan Mountech Co., Ltd.) for image analysis (in terms of area circle) When the electron microscope expands the image of the image, the average particle diameter is about 15 μm), and the carbon black contains acrylic particles (in the case of Mac-View (made by Japan Mountech Co., Ltd.), the image is enlarged by an electron microscope. The average particle diameter: about 15 μm), 10% by mass, and 2% by mass of sorbitan trioleate were formed to form a gap of about 10 μm in a portion where the insulating partition walls intersect.

(Example 4)

In the above Example 1, a thermoplastic polyurethane resin was used as a closed adhesive layer (or a closed adhesive layer). Specifically, the thermoplastic polyurethane resin is applied to a release film made of polyethylene to a thickness of 8 μm, heated while being bonded by a roller, and heated when bonded to the substrate. The composition of the electrophoretic sheet and the electrophoresis medium is made.

(Evaluation of performance of electrophoretic display media of Examples 2 to 4)

In the display regions of the electrophoretic display sheets obtained in the above Examples 2 to 4, no bubbles were mixed, and the interval between the electrodes and the film having the closed adhesive layer (or the closed adhesive layer) was uniform.

Further, in each of the electrophoretic display sheets obtained in the examples 2 to 4, the electrode substrate was bonded in the same manner as in the above-described first embodiment, and the display of the obtained electrophoretic display medium after drying for one month at 50 ° C was evaluated. When the performance is the same, no change in the initial display characteristics is observed, and an electrophoretic display medium which is very unlikely to cause display deterioration is obtained. In addition, no bubbles were observed in the element.

[Embodiments 5 to 7, second embodiment, according to Figs. 11 to 13] (Example 5)

The electrophoretic display sheet and the electrophoretic display medium were obtained through the following items.

1) Engineering of a plurality of components formed by forming an insulating partition wall on an electrode substrate

As the electrode substrate, a 125 μm thick PET sheet (10 × 10 cm) formed of a transparent material ITO film having a surface resistance of about 300 Ω/□ was used.

On the first electrode substrate, an acrylic UV curable resin material is applied at 40 μm, and then a plurality of grid-like elements (height) formed by UV exposure and development to form an insulating partition wall are formed. 40 μm, component size 300 × 300 μm). The longitudinal cross-sectional shape of the partition wall is a quadrilateral triangular shape, the bottom edge = 18 μm, the height = 40 μm, and the top width: 5 μm or less.

2) Engineering of filling electrophoretic ink into components

The composition of the electrophoretic ink to be used: an electrophoretic ink having the same composition as that of the above-described Example 1 was filled in the above-mentioned member using an applicator.

3) Engineering of bonding the bottom plate and the electrophoretic display sheet forming the closed layer

As a closed precursor layer, a dispersion of an ultraviolet curable urethane oligomer (containing a photocuring initiator) adjusted for viscosity by using purified water is applied onto a PET film (10×10 cm) having a thickness of 70 μm. The water was removed to form a thickness of 8 μm.

After the electrode substrate having the electrophoretic ink is filled and one end of the film having the precursor layer is closed, the UV-curable urethane resin is cured by irradiating ultraviolet rays from the PET film side by bonding between the opposing rollers. As the sealing layer, an electrophoretic display sheet was obtained by peeling off the PET film.

No bubbles were mixed in the display region of the obtained electrophoretic display sheet, and the interval between the electrode and the sealing layer was uniform.

Further, on the outer surface of the closed layer of the obtained electrophoretic display sheet, a urethane hot-melt layer having a thickness of 5 μm is formed as an adhesive layer (or an adhesive layer), and then the adhesive layer (or adhesive layer) is passed through the adhesive layer. Heat the bottom plate (125 μm PET substrate on which the ITO planar electrode is formed) to 80 ° C and heat The layering is applied at the same time. Thereafter, by applying a voltage of +50 V and -50 V between the two electrodes, it is confirmed that a black-and-white display capable of high contrast can be confirmed.

Further, when the display performance of the obtained electrophoretic display medium after drying for one month at 50 ° C was evaluated, no change in the initial display performance was observed, and an electrophoretic display medium which was extremely resistant to display deterioration was obtained. . In addition, no bubbles were observed in the element.

(Example 6)

In the above-described fifth embodiment, a configuration in which a gap of about 5 μm is formed in a portion where the insulating partition walls intersect is formed.

(Example 7)

In the same manner as in the third embodiment, the composition of the electrophoretic ink was changed in the same manner as in the third embodiment, and a gap of about 10 μm was formed in a portion where the insulating partition walls intersect.

The bubbles in the display region of each of the electrophoretic display sheets obtained in the above Examples 6 and 7 were not mixed, and the interval between the electrodes and the film having the sealing layer 31 was uniform.

Further, in each of the electrophoretic display sheets obtained in Examples 6 and 7, the electrode substrate was bonded in the same manner as in Example 5, and the display of the obtained electrophoretic display medium after drying for one month at 50 ° C was evaluated. When the performance was the same, no change in the initial display performance was observed, and an electrophoretic display medium which is very unlikely to cause display deterioration was obtained. In addition, no bubbles were observed in the element.

[Embodiments 8 to 10, the third embodiment, according to Figs. 13 to 15] (Example 8)

The electrophoretic display sheet and the electrophoretic display medium were obtained through the following items.

1) Engineering of a plurality of components formed by forming an insulating partition wall on an electrode substrate

As the electrode substrate, a 125 μm thick PET sheet (10 × 10 cm) formed of a transparent material ITO film having a surface resistance of about 300 Ω/□ was used.

On the first electrode substrate, an acrylic UV curable resin material is applied at 40 μm, and then a plurality of grid-like elements (having a height of 40 μm) formed by UV exposure and developed to form an insulating partition wall are formed. , component size 300 × 300 μm). The longitudinal cross-sectional shape of the partition wall is a quadrilateral triangular shape, the bottom edge = 18 μm, the height = 40 μm, and the top width: 5 μm or less.

2) Engineering of filling electrophoretic ink into components

The composition of the electrophoretic ink to be used: an electrophoretic ink having the same composition as that of the above-described Example 1 was filled in the above-mentioned member using an applicator.

3) Engineering of a closed film with an adhesive layer

As an adhesive layer, it is a UV-curable amine group that has been adjusted for viscosity. The acid ester acrylate resin was applied to a polyvinylidene fluoride film (10 × 10 cm) having a thickness of 10 μm as a closed film, and then formed to have a film thickness of 5 μm.

After the electrode substrate filled with the electrophoretic ink is blended with one end of the closed film having the adhesive layer, the ultraviolet curable amine is cured by irradiating ultraviolet rays from the polyvinylidene fluoride film side by bonding between the opposing rollers. The urethane acrylate resin was obtained to obtain an electrophoretic display sheet.

No bubbles were mixed in the display region of the obtained electrophoretic display sheet, and the interval between the electrode and the sealing film of the adhesive layer was uniform.

Further, on the outer surface of the closed film of the obtained electrophoretic display sheet, a urethane hot-melt layer having a thickness of 5 μm is formed as an adhesive layer (or an adhesive layer), and then passed through the adhesive layer (or adhesive layer). The bottom plate (the 125 μm PET substrate on which the ITO planar electrode was formed) was heated to 80 ° C and bonded while being thermally laminated. Thereafter, by applying a voltage of +50 V and -50 V between the two electrodes, it is confirmed that a black-and-white display capable of high contrast can be confirmed.

Further, when the display performance of the obtained electrophoretic display medium after drying for one month at 50 ° C was evaluated, no change in the initial display performance was observed, and an electrophoretic display medium which was extremely resistant to display deterioration was obtained. . In addition, no bubbles were observed in the element.

(Example 9)

In the same manner as in the third embodiment, the composition of the electrophoretic ink was changed in the same manner as in the third embodiment, and a gap of about 10 μm was formed in a portion where the insulating partition walls intersect.

(Embodiment 10)

In the above Example 8, a thermoplastic polyurethane resin was used as the adhesive layer. Specifically, a thermoplastic polyvinyl urethane resin was applied to a polyvinylidene fluoride film as a closed film to a thickness of 5 μm, and an electrophoretic display was produced by heating while bonding with a roller. The composition of the sheet.

(Evaluation of performance of electrophoretic display media of Examples 9 and 10)

No bubbles were mixed in the display region of each of the electrophoretic display sheets obtained in the above Examples 9 to 10, and the interval between the electrodes and the closed film having the adhesive layer was uniform.

Further, in each of the electrophoretic display sheets obtained in Examples 9 and 10, the electrode substrate was bonded in the same manner as in the above-described Example 8, and the display of the obtained electrophoretic display medium was allowed to stand at 50 ° C for one month. When the performance is the same, no change in the initial display characteristics is observed, and an electrophoretic display medium which is very unlikely to cause display deterioration is obtained. In addition, no bubbles were observed in the element.

[Industrial Applicability]

The electrophoretic display sheet of the present invention and the electrophoretic display medium using the same can be suitably used for e-books, electronic newspapers, etc., electronic paper, billboards, posters, blackboards, etc., electronic price tags, electronic warehouse labels, electronic advertisements, actions The use of the display unit of the machine, etc.

A, B, C‧‧‧ electrophoretic display sheets

10‧‧‧Substrate

11‧‧‧Electrode layer

15‧‧‧ next door

16‧‧‧ components

20‧‧‧Component-like structures

25‧‧‧Electronic ink

30‧‧‧ Closed layer (or closed adhesive layer)

35‧‧‧film

40‧‧‧Closed precursor layer

41‧‧‧Closed layer

45‧‧‧film

46‧‧‧Next layer (or adhesive layer)

50‧‧‧Next layer

55‧‧‧Closed film

56‧‧‧Next layer (or adhesive layer)

60‧‧‧Backplane (TFT substrate)

Fig. 1 (a) is a schematic longitudinal cross-sectional view showing an electrophoretic display sheet according to a first embodiment of the present invention, and (b) is an enlarged schematic longitudinal cross-sectional view of (a).

2(a) to 2(c) are schematic views showing the manufacturing process of the electrophoretic display sheet of the first embodiment for each project.

Fig. 3(a) is an explanatory view showing a case where the width of the short axis of the partition wall is narrowed toward the side of the closed adhesive layer (or the closed adhesive layer), and (b) the width of the short axis of the partition wall is directed toward the closed adhesive layer (or closed adhesive layer). An illustration of the case where the side is not narrowed.

4(a) to 4(d) are explanatory views of other examples of the short-axis shapes (longitudinal cross-sectional shapes) of the partition walls.

5(a) to 5(c) are partial plan views showing a part of an element-like structure formed by a partition wall (a shape of a well type), a partial front view, and a partial oblique view.

6(a) to 6(c) are partial plan views, partially front view and partial oblique views, showing an example (hexagonal shape) of an element-like structure formed through a partition wall.

Fig. 7 is an explanatory view showing a state in which an electrophoretic ink layer of an element-like structure (hexagonal shape type) formed through a partition wall is used.

(a) and (b) of FIG. 8 are explanatory views for explaining the state of each element in which the communication hole is formed in the element-like structure (hexagonal shape, well-shaped shape) formed through the partition wall.

Fig. 9 (a) is a schematic longitudinal cross-sectional view showing a state in which a peeling film of an electrophoretic display sheet is peeled off, and (b) is an explanatory view showing a state in which a peeling film is peeled off from an electrophoretic display sheet, and a state of a substrate (TFT, a segmented substrate, etc.) is bonded. .

Fig. 10 (a) is a schematic longitudinal cross-sectional view showing an electrophoretic display sheet according to an example of the second embodiment of the present invention, and (b) is an enlarged schematic longitudinal cross-sectional view of (a).

11(a) to 11(d) are schematic views showing the manufacturing process of the electrophoretic display sheet according to the second embodiment of the present invention for each item.

Fig. 12 (a) is a schematic longitudinal cross-sectional view showing a state in which a peeling film of the electrophoretic display sheet according to the second embodiment of the present invention is peeled off, and (b) shows a state in which the peeling film is peeled off from the electrophoretic display sheet, and the substrate is bonded to the substrate (TFT, minute). Explanation of the state of the segment substrate, etc.).

Fig. 13 (a) is a schematic longitudinal cross-sectional view showing an electrophoretic display sheet according to a third embodiment of the present invention, and (b) is an enlarged schematic longitudinal cross-sectional view of (a).

14(a) to 14(c) are schematic views showing the manufacturing process of the electrophoretic display sheet according to the third embodiment of the present invention for each item.

Fig. 15 is an explanatory view showing a state in which a backing layer (TFT, a segmented substrate, etc.) is bonded to the outer layer or the adhesive layer formed on the outer surface of the electrophoretic display sheet according to the third embodiment of the present invention.

A‧‧‧electrophoretic display sheet

10‧‧‧Substrate

11‧‧‧Electrode layer

15‧‧‧ next door

25‧‧‧Electronic ink

30‧‧‧ Closed layer (or closed adhesive layer)

35‧‧‧film

Claims (16)

An electrophoretic display sheet characterized in that an element-shaped structure formed of a partition wall of an insulating material is formed on a light-transmitting electrode surface of a light-transmitting substrate material, and an electrophoretic ink is filled inside the element-shaped structure. A film having a closed adhesive layer or a closed adhesive layer is bonded to the electrophoretic ink layer. The electrophoretic display sheet according to the first aspect of the invention, wherein the partition wall of the insulating material faces the closed adhesive layer or the closed adhesive layer from the light-transmitting electrode surface side, and the short-axis width of the partition wall is narrowed. In the electrophoretic display sheet according to the second aspect of the invention, the short axis width of the partition wall on the side of the sealing layer or the sealing adhesive layer is smaller than the particle diameter of at least one of the electrophoretic particles contained in the electrophoretic ink layer. The electrophoretic display sheet according to any one of claims 1 to 3, wherein the partition wall of the insulating material is formed with at least one of the gaps having a small particle diameter. An electrophoretic display sheet characterized in that an element-shaped structure formed of a partition wall of an insulating material is formed on a light-transmitting electrode surface of a light-transmitting substrate material, and an electrophoretic ink is filled inside the element-shaped structure. After the film having the closed precursor layer is bonded to the electrophoretic ink layer, the closed precursor layer is cured to form a sealing layer, and the electrophoretic ink layer is sealed, and then the film is peeled off from the sealing layer. The electrophoretic display sheet according to claim 5, wherein the partition wall of the insulating material faces the sealing layer from the light-transmitting electrode surface side, and the short-axis width of the partition wall is narrowed. In the electrophoretic display sheet according to the sixth aspect of the invention, the short axis width of the partition wall on the side of the layer to be layered is smaller than the particle diameter of at least one of the electrophoretic particles contained in the electrophoretic ink layer. The electrophoretic display sheet according to any one of the fifth aspect of the present invention, wherein the partition wall of the insulating material is formed with at least one of the gaps having a small particle diameter. The electrophoretic display sheet according to any one of the items 5 to 8, wherein an adhesive layer or an adhesive layer is formed on the outer surface of the sealing layer of the electrophoretic display sheet. An electrophoretic display sheet characterized in that an element-shaped structure formed of a partition wall of an insulating material is formed on a light-transmitting electrode surface of a light-transmitting substrate material, and an electrophoretic ink is filled inside the element-shaped structure. After the sealing film having the adhesive layer formed thereon is bonded to the electrophoretic ink layer, the electrophoretic ink layer is sealed by curing the adhesive layer. The electrophoretic display sheet according to claim 10, wherein the partition wall of the insulating material is directed from the light-transmitting electrode surface side toward the sealing film side, and the short-axis width of the partition wall is narrowed. The electrophoretic display sheet according to claim 11, wherein the short axis width of the partition wall on the side of the layer to be layered is smaller than the particle diameter of at least one of the electrophoretic particles contained in the electrophoretic ink layer. The electrophoretic display sheet according to any one of claims 10 to 12, wherein the partition wall of the insulating material is formed with at least one of a gap having a small particle diameter. The electrophoretic display sheet according to any one of claims 10 to 13, wherein an adhesive layer or an adhesive layer is formed on the outer surface of the sealing layer of the electrophoretic display sheet. An electrophoretic display medium characterized in that a substrate on which one or more electrodes are formed is bonded and formed by peeling a film of an electrophoretic display sheet according to any one of claims 1 to 4. An electrophoretic display medium characterized in that an electrophoretic display sheet according to claim 9 or 14 is attached to a substrate on which one or more electrodes are formed by an adhesive layer or an adhesive layer.