KR101241307B1 - Electrophoretic display device and method of fabricating the same - Google Patents

Abstract

Embodiments of the present invention relate to an electrophoretic display device and a manufacturing method thereof. An electrophoretic display device according to an embodiment of the present invention comprises: first and second substrates facing each other; A plurality of cells disposed between the first substrate and the second substrate; And at least one or more types of electrophoretic particles dispersed in the plurality of cells, and a surface exposed in the plurality of cells may include a steric hindrance layer for the electrophoretic particles.

Description

Electrophoretic display device and method of fabricating the same

The present invention relates to display technology, and more particularly, to an electrophoretic display device and a method of manufacturing the same.

As an information display apparatus for replacing a liquid crystal display apparatus, a display apparatus using a technique such as electrophoresis, electro-chromic, or dichroic particles rotary method is proposed. Has been. These techniques have been extensively studied as next generation display devices that can replace liquid crystal display devices due to advantages such as wide viewing angle, low power consumption and memory effect in proximity to conventional print media.

Among these display devices, an electrophoretic display device has electrophoretic particles dispersed in two electrodes and a dielectric fluid closed between the two electrodes, and the particles are separated by an electric field applied between the electrodes. Display information using the phenomenon of flow. In such an electrophoretic display device, there have been continuous studies for improving the response speed of the electrophoretic particles and reducing the driving voltage.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide an electrophoretic display device having improved response speed of electrophoretic particles in an electrophoretic display device and a reduced driving voltage.

Another object of the present invention is to provide a method of manufacturing an electrophoretic display device having the aforementioned advantages.

An electrophoretic display device according to an embodiment of the present invention for solving the above problems, the first and second substrate facing each other; A plurality of cells defined by a partition wall disposed between the first substrate and the second substrate; And at least one or more types of electrophoretic particles dispersed within the plurality of cells, and a surface of the partition wall includes a stereoscopic barrier layer for the electrophoretic particles.

The steric hindrance layer may include a surfactant exposed on the surface of the partition wall. In this case, the partition wall may include a resin-based polymer material, and the surfactant may be primarily or secondly bonded to the main chain of the resin-based polymer material or to a sub chain bonded to the main chain. In addition, the surfactant may be any one or a combination thereof selected from the group consisting of amine salts and alkyl ammonium; anionic surfactants which are any one or a combination thereof selected from the group consisting of α-olefin sulfonates, alkyl sulfate ester salts, alkyl ether sulfates and alkyl sulfonates; Or a nonionic surfactant selected from the group consisting of polyisobutylene succinimide and polyoxyethylene lauryl ether.

In another embodiment, the steric hindrance layer may include inorganic particles exposed on the surface of the partition wall. In this case, the inorganic particles may be attached to the surface of the partition wall using a binder resin, or may include inorganic particles dispersed in the partition wall and exposed to the surface. The average size of the inorganic particles may be smaller than the average size of the electrophoretic particles. In some embodiments, the average size of the inorganic particles may be 1 nm to 100 nm, preferably 1 nm to 50 nm.

The inorganic particles may be titanium oxide, antimony trioxide, zinc sulfide, zinc oxide, barium sulfate, barium titanium oxide, kaolin, or kaolun. ), Silicon oxide (silica), calcium oxide (calcium oxide), calcium carbonate (CaCO ₃ ), or a mixture composition thereof may be included. Alternatively, the inorganic particles may include carbon black, copper oxide, manganese dioxide, aniline black, activated carbon, neo super black, sudan black, or a mixed composition thereof.

Electrophoretic display device according to another embodiment of the present invention for solving the above problems, the first and second substrate facing each other; A plurality of cells disposed between the first substrate and the second substrate; And at least one or more types of electrophoretic particles dispersed in the plurality of cells, and a surface exposed in the plurality of cells may include a steric hindrance layer for the electrophoretic particles.

The surface exposed in the plurality of cells may include at least one of a partition, an electrode, and a surface on the sealing layer.

According to another aspect of the present invention, there is provided a method of manufacturing an electrophoretic display device, which is spaced apart in a direction parallel to a main surface of the first substrate on a first substrate and includes a three-dimensional interference layer on a surface thereof. Forming a partition wall; Filling at least one kind of electrophoretic particles into a plurality of cells defined by the partition wall; And coupling a second substrate on the partition wall so as to face the first substrate.

In some embodiments, the forming of the partition wall may include applying or stacking a photosensitive film on the first substrate, the photosensitive film including a resin-based polymer material and a surfactant bonded to the main chain or the main chain of the resin-based polymer material; And patterning the photosensitive film to expose the surfactant on the surface to provide the particle barrier layer.

In another embodiment, the forming of the partition wall may include applying or stacking a photosensitive film including a resin-based polymer material and inorganic particles dispersed in the resin-based polymer material on the first substrate; And patterning the photosensitive film to expose the inorganic particles on the surface to provide the particle blocking layer.

In another embodiment, the forming of the partition wall may include applying or stacking a photosensitive film including a resin-based polymer material on the first substrate; Forming a partition pattern on the first substrate by patterning the photosensitive film; And applying a solution including a solvent selected to prevent the barrier rib pattern from dissolving on the barrier rib pattern and a surfactant dispersed in the solvent so as to first or secondary bond the surfactant to the surface of the barrier rib pattern. It may also comprise the step of providing the particle barrier layer.

In another embodiment, the forming of the partition wall may include applying or stacking a photosensitive film including a resin-based polymer material on the first substrate; Forming a partition pattern on the first substrate by patterning the photosensitive film; And a solution including a solvent selected so as not to dissolve the barrier rib pattern, a binder material dissolved in the solvent, and particle particles dispersed in the solvent, to the surface of the barrier rib pattern. May be provided to provide the particle barrier layer by exposure.

An electrophoretic display device according to embodiments of the present invention provides direct contact of electrophoretic particles with a partition and / or electrode surface by providing a stereoscopic barrier layer for electrophoretic particles on the side of the partition defining the cells. Control the electrical and / or physical interaction by interfering with each other or by adjusting the distance, thereby reducing the driving resistance of the electrophoretic particles by the partition wall, thereby improving the response speed, the driving voltage and the reflectance. In addition, by controlling the affinity between the partition and the electrophoretic particles by the three-dimensional interference layer, the electrophoretic particles are electrically, physically and chemically attached to the partition surface to improve the problem of product life and display quality This is improved.

In addition, the electrophoretic display device according to another embodiment of the present invention may be provided with a three-dimensional interference layer on the other surface exposed in the cell in addition to the partition wall, the chemical between the electrophoretic particles and the exposed surface by the three-dimensional interference layer The intermolecular and electrostatic forces are reduced with increasing intimacy and distance, so that electrophoretic particles can be easily removed from their surface. As a result, unnecessarily increased driving voltage can be reduced due to the chemical similarity of the material in the cells, and response speed can be improved. In this case, the steric hindrance layer also functions substantially as a means for adjusting the driving voltage and the response speed of the electrophoretic particles.

In addition, according to the embodiment of the present invention, it is possible to easily manufacture the electrophoretic display device having the above-described advantages.

1A is a cross-sectional view illustrating an electrophoretic display device according to an embodiment of the present invention, and FIGS. 1B and 1C are enlarged views of a portion of a partition wall 30 according to various embodiments.
2A to 2E are cross-sectional views illustrating a method of manufacturing an electrophoretic display device according to an embodiment of the present invention in a process sequence.
3A to 3E are cross-sectional views illustrating electrophoretic display devices according to other embodiments of the present invention.
4 is a cross-sectional view illustrating an image sheet according to an embodiment of the present invention.
FIG. 5A is a cross-sectional view illustrating an electrophoretic display device according to another exemplary embodiment. FIG. 5B is an enlarged view for describing a subpixel that may be applied to the device of FIG. 5A.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The embodiments of the present invention are described in order to more fully explain the present invention to those skilled in the art, and the following embodiments may be modified into various other forms, It is not limited to the embodiment. Rather, these embodiments are provided so that this disclosure will be more faithful and complete, and will fully convey the scope of the invention to those skilled in the art.

In the drawings, the thickness and size of each layer are exaggerated for convenience and clarity of description, and the same reference numerals refer to the same elements in the drawings. As used herein, the term "and / or" includes any and all combinations of one or more of the listed items.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. Also, as used herein, "comprise" and / or "comprising" specifies the presence of the mentioned shapes, numbers, steps, actions, members, elements and / or groups of these. It is not intended to exclude the presence or the addition of one or more other shapes, numbers, acts, members, elements and / or groups.

Although the terms first, second, etc. are used herein to describe various members, parts, regions, and / or parts, these members, parts, regions, and / or parts should not be limited by these terms. Is self-explanatory. These terms are only used to distinguish one member, part, region or part from another region or part. Thus, the first member, part, region, or portion, which will be described below, may refer to the second member, component, region, or portion without departing from the teachings of the present invention.

Embodiments of the present invention will now be described with reference to the drawings, which schematically illustrate ideal embodiments of the present invention. In the drawings, for example, the size and shape of the members may be exaggerated for convenience and clarity of description, and in actual implementation, variations of the illustrated shape may be expected. Accordingly, embodiments of the present invention should not be construed as limited to the specific shapes of the regions shown herein.

1A is a cross-sectional view illustrating an electrophoretic display apparatus 100 according to an embodiment of the present invention, and FIGS. 1B and 1C are partially enlarged views of a partition wall 30 according to various embodiments.

Referring to FIG. 1A, the electrophoretic display apparatus 100 may include a first substrate 10 (which may be a lower substrate in this drawing) and a second substrate 20 facing the lower substrate 10 (the upper substrate in this drawing). May be included). In one embodiment, at least one of the lower substrate 10 and the upper substrate 20, for example, the upper substrate 20 may be transparent, and the lower substrate 10, which is the other, may not be transparent. Alternatively, both the lower substrate 10 and the upper substrate 20 may be transparent. The lower substrate 10 and the upper substrate 20 may be formed of a glass substrate, an inorganic material having a single crystal or polycrystalline structure, or a resin-based material having flexibility.

Between these substrates 10 and 20, a partition wall 30 is disposed, and at least one kind of electrophoretic particles 72a, in a plurality of cells V1, V2, and V3 defined by the partition wall 30. A light conversion layer 70 in which 72b) is dispersed is disposed. The plurality of cells V1, V2, V3 may be filled with a dielectric fluid 71 such as a dielectric solution or a dielectric gas, and the electrophoretic particles 72a and 72b are dispersed in the dielectric fluid 71.

Particles 72a and 72b dispersed in dielectric fluid 71 are a kind of electrophoresis having a single color, for example, one of black and white, in each cell to achieve a mono chrome display. Particles or two kinds of electrophoretic particles. Alternatively, as illustrated in FIG. 1A, the particles may include two or more kinds of electrophoretic particles 72a and 72b having different colors in each cell V1, V2, and V3, and these particles may be different from each other. It may have a mobilization mobility. The particles 72a and 72b may include electrophoretic particles having different colors, such as red, green, and blue, for each cell.

For example, in order to implement a multi-color display of the RGB color system, when the first cell V1, the second cell V2, and the third cell V3 are red, green, and blue subpixels, respectively, Cell V1 may comprise red electrophoretic color particles 72R. Similarly, the second cell V2 and the third cell V3 may include green and blue electrophoretic color particles 72G and 72B, respectively. In another embodiment, to realize the colors of the CMY color system, the color particles 72b of the first cell V1, the second cell V2, and the third cell V3 are respectively cyan, magenta, and It may also comprise yellow electrophoretic color particles.

In some embodiments, each of the cells V1, V2, and V3 may further include black particles or white particles 72a having different electrophoretic mobility along with these color particles 72R, 72G, and 72B. . The distinctive driving of the colored particles 72b and the black or white particles 72a causes the observer 1 to identify the displayed information.

As described above, the light conversion layer 70 between the substrates 10 and 20 is divided by the partition wall 30 in a direction parallel to the main surfaces of the substrates 10 and 20, and is divided by the divided small spaces. Cells V1, V2, and V3 are defined, and each cell, alone or in combination with other adjacent one or more cells, may constitute one sub-pixel or pixel. The pattern of the partition wall 30 may define a pixel pattern of the electrophoretic display apparatus 100. For example, the partition wall 30 is arranged in the form of a polygon, a circle, an oval, a grid, a honeycomb, a meander, or a line, such as a square, a triangle, and a pentagon, when viewed from the position of the observer 1. Can be.

The height of the partition wall 30 may be within 1 μm to 0.1 mm, and the width of the partition wall 30 may be 5 μm to 10 mm. In addition, the distance between the partition wall 30 may be 10 ㎛ to 10 mm. The pitch of the adjacent partition walls 30 may range from 15 μm to 20 mm. The cross-sectional profile of the partition 30 may be substantially perpendicular to the main surface of the lower substrate 10, as shown. However, the present invention is not limited thereto, and the cross-sectional profile of the partition wall 30 may have a tapered shape in which the width gradually decreases toward the upper substrate or vice versa.

The side surface of the partition wall 30 includes a steric hindrance layer 30S. The steric hindrance layer 30S reduces the physical, electrical or chemical affinity between the charged electrophoretic particles 72a, 72b and the surface of the partition wall 30 present in the cells V1, V2, V3, thereby providing a fluid Increase the dispersion stability of the electrophoretic particles 72a, 72b in the electrophoretic particles, electrophoretic particles 72a, 72b are electrostatically adsorbed on the partition 30, or physically and / or chemically adsorbed to drive voltage This increase in the response speed and the response speed are improved This steric hindrance layer 30S can provide steric repulsion to the charged electrophoretic particles 72a and 72b in an aggressive sense. The layer 30S may be formed simultaneously with the patterning of the partition 30, or may be formed independently of the manufacturing process of the partition 30 on the surface of the partition 30 by an external method. Will be described later.

In some embodiments, steric hindrance layer 30S may include a surfactant 30A exposed on the partition 30 surface, as shown in FIG. 1B. In this case, the partition wall 30 may be a resin polymer such as polyester, polyethylene, polystyrene, polycarbonate, polyimide, epoxy resin, polyurethane, polyacrylate, silicone resin, melamine resin, acrylic resin, or phenol resin. It may be formed of a material or a combination thereof. These resin-based materials are exemplary and the present invention is not limited thereto. Surfactant 30A can be primary or secondary bonded to the main chain constituting these resin-based polymer materials. In the present specification, the primary bond refers to ionic bonds, covalent bonds, and metal bonds, and the secondary bonds are ionic bonds, dipole bonds, van der Waals bonds, or ions which are intermolecular bonds other than the primary bond. -Refers to a dipole bond.

In another embodiment, one or more subchains may be bonded to the main chain constituting these resin-based high molecular materials, and a surfactant 30A may be primary bond or secondary bond to these subchains. The sub chain may include at least one repeating unit selected from the group consisting of isobutylene, hexmethacrylate, laurylmethacrylate, methacrylate and urethane ester. can do.

Surfactant 30A may be a commercially available anionic surfactant, cationic surfactant or nonionic surfactant. Surfactants can provide steric barriers of water or tens of molecule sizes. For example, the cationic surfactant may be any one or a combination thereof selected from the group consisting of amine salts and alkyl ammonium. The anionic surfactant may be any one selected from the group consisting of α-olefin sulfonate, alkyl sulfate ester salt, alkyl ether sulfate, and alkyl sulfonate, or a combination thereof. The nonionic surfactant may be any one selected from the group consisting of polyisobutylene succinimide and polyoxyethylene lauryl ether, or a combination thereof. Examples of these listed surfactants are exemplary, and the present invention is not limited thereto, and other known surfactants may also be used.

In some embodiments, for the secondary bond between the surfactant 30A and the main chain and / or the sub chain of the resin-based polymer material constituting the partition 30, such as an ion bonder in the main chain and / or the sub chain of the resin-based separator material. Suitable functional groups can be combined. The ion bonding group may be an acid group of a carboxyl group, a sulfonic acid group, a phosphoric acid group, a sulfate group and a sulfonate group; Base groups of amine groups, ammonium groups, and imine groups; And salts such as sodium sulfonate, potassium sulfonate, sodium phosphate, potassium phosphate, and amine salts. However, these are exemplary and the present invention is not limited thereto, and other suitable acid groups, base groups or functional groups of salts may be applied.

In some embodiments, when the ionic bond group has an acidic functional group, a cationic surfactant may secondary bond with the acidic functional group, and when the ionic bond group is a basic functional group, anionic surfactant is the basic functional group Can be combined with the secondary. In addition, when the ionic bond group is selected from the group of salts, anionic surfactants, cationic surfactants or nonionic surfactants may be secondary bonded according to the type of the salt.

In another embodiment, the steric hindrance layer 30S may include inorganic particles 30P exposed on the surface of the partition wall 30, as shown in FIG. 1C. The inorganic particles 30P may be particles attached to the surface of the partition wall 30 using a binder, or particles dispersed in the above-described resin-based polymer material and exposed to the surface. The partition wall 30 may be the above-described resin-based polymer material.

The average size of the inorganic particles 30P is such that it provides a steric hindrance to the electrophoretic particles 72a, 72b while not disturbing the flow of the electrophoretic particles 72a, 72b. 72a, 72b). For example, electrophoretic particles 72a, 72b may generally have an average particle diameter of 0.05 μm to 20 μm, and the organic or inorganic particles may have the average particle diameter of electrophoretic particles 72a, 72b. Can be less than In some embodiments, the inorganic particles may have an average size of 1 nm to 100 nm, preferably 1 nm to 50 nm. If it is smaller or larger than this, it may be difficult to obtain a steric hindrance effect, given the size of the electrophoretic particles.

When the inorganic particles 30P are externally attached to the partition wall 30 using a binder resin, the binder resin and the solvent may be selected so that the partition wall 30 is not eroded. The binder resin is a polymer resin material similar to the materials constituting the partition wall 30, but is a material that can be selectively dissolved in comparison with the partition wall 30 by the solvent. For example, the binder resin may be a urethane resin, a urea resin, an acrylic resin, a polyester resin, an acrylic urethane resin, or an acrylic urethane silicone. Acrylic urethane silicone resins, acrylic urethane fluorocarbon polymers, acrylic fluorocarbon polymers, silicone resins, acrylic silicone resins, polystyrene resins (polystyrene resin), styrene acrylic resin, polyolefin resin, butyral resin, vinylydinene chloride resin, melamine resin, phenolic resin (phenolic resin), fluorocarbon polymers, polycarbonate resin, polysulfon resin, polyether resin, poly Among polymer resin materials such as polyethylene resin and polyamide resin, the material may be a material which can be selectively dissolved relative to the partition wall, and these materials may be used in combination of two or more materials. However, this is exemplary and the present invention is not limited thereto. For example, the binder resin may be gelatin, alginic acid, latex polymer, polystyrene, polyvinyl formal, polyvinyl butyral, polymethyl acrylate, polybutyl acrylate, polymethyl. It may also be formed from other polymeric materials such as methacrylate, polybutyl methacrylate.

The inorganic particles 30P may be white or black particles. The white particles may be, for example, titanium oxide, antimony trioxide, zinc sulfide, zinc oxide, barium sulfate, barium titanium oxide. ), Kaolin, silicon oxide, calcium oxide, calcium carbonate (CaCO ₃ ), or a mixed composition thereof. The black pigment may be, for example, carbon black, copper oxide, manganese dioxide, aniline black, activated carbon, neo super black, sudan black, or a mixed composition thereof. The dyes may be commercial acid dyes, oil-soluble dyes, disperse dyes, reactive dyes, direct dyes, or mixtures thereof.

Referring back to FIG. 1A, the electrophoretic display apparatus 100 includes electrodes for driving an electrophoretic particles 72a and 72b by generating an electric field in the cells V1, V2 and V3. In the embodiment illustrated in FIG. 1A, the electrodes may include electrodes 41 and 42 facing each other to generate an electric field perpendicular to the main surfaces of the substrates 10 and 20. The electrodes 42 on the lower substrate 10 may include individual electrodes 42R, 42G, and 42B for each cell. In addition, the electrode on the upper substrate 20 may include a common electrode 30c opposite the individual electrodes 42. Although not shown, in some embodiments, a plurality of individual electrodes may be formed in each cell defined by the partition wall so that a plurality of individual electrodes may be assigned to each cell, in which case the plurality of individual electrodes in each cell Gradation can be expressed using them.

At least one of these electrodes 41 and 42 may be a transparent electrode. For example, the common electrode 41 on the upper substrate 20 that provides the viewer 1 with a visible surface is a transparent electrode. In addition, to form a transmissive display device, the pixel electrodes 42 may also be transparent electrodes. The transparent electrode may include, for example, Indium-Tin-Oxide (ITO), Fluorinated Tin Oxide (FTO), Indium Oxide (IO), and Tin Oxide; It may be formed of any one or a combination of a transparent metal oxide such as SnO ₂ ), a transparent conductive resin such as polyacetylene, or a conductive resin containing conductive metal fine particles, but the present invention is not limited thereto. . On these electrodes 41 and 42, a suitable electrically insulating protective film (not shown) for protecting them may be formed.

Individual electrodes 42 may be driven by a suitable switch element, for example MOS thin film transistor 50. The MOS thin film transistor 50 has a semiconductor layer 50A having a channel region and a source / drain region, a gate electrode 50G, a gate insulating film 50I between the semiconductor layer 50A and the gate 50G, and a gate 50G. The source electrode 50S and the drain electrode 50D may be electrically connected to the source / drain regions spaced apart from each other. In some embodiments, an ohmic contact layer 50C may be formed between the source / drain region of the semiconductor layer 50A and the source electrode 50S and the drain electrode 50D. The MOS thin film transistor 50 may be electrically isolated from other adjacent members by the passivation film 60 formed of a suitable insulating material.

In the embodiment shown in FIG. 1A, an active matrix including MOS thin film transistors 50 is illustrated, but this is merely illustrative, and those skilled in the art will appreciate the passive matrix electrode configuration for other dynamic drive, or static drive. It will be appreciated that the segmented electrode configuration may be included in the embodiment of the present invention.

Typically, the electrophoretic display device has a memory characteristic that can retain the displayed information as particles remain on the electrodes even when the power source is removed. In order to enhance such memory characteristics, it may be desirable to selectively provide only the region where the electrodes 41 and 42 do not exist without the steric hindrance layer 30S disposed on the surface where the electrodes are disposed. For example, as in the embodiment shown in FIG. 1A, the steric hindrance layer 30S is provided in the partition 30 where no electrodes are disposed or on the surface of the partition 30. However, as another embodiment, if the strong physical and electrical adsorption between the surface of the electrodes 41, 42 and the particles 72a, 72b is a factor in increasing the driving voltage, the electrodes 41 may be limited to this. If there is a protective film on the surface of 42, or on the electrodes, the steric hindrance layer 30S may also be provided on the protective film.

2A to 2E are cross-sectional views illustrating a method of manufacturing an electrophoretic display device according to an embodiment of the present invention in a process sequence. In these figures, descriptions of constituent members having the same reference numerals as FIGS. 1A-1C may refer to the disclosures of FIGS. 1A-1C, unless contradictory.

Referring to FIG. 2A, a gate electrode 50G, a gate insulating film 50I, a semiconductor layer 50A, an ohmic contact layer 50C, a source electrode 50S, and a drain electrode 50D are disposed on a lower substrate 10. A driving device such as MOS thin film transistors 50 is formed. These transistors 50 may be arranged in an array of a plurality of rows x a plurality of columns, and may be formed in regions where data lines and gate lines cross each other. The surface of the MOS thin film transistors 50 may be electrically insulated from the adjacent members by the passivation film 60. The passivation film 60 may include a low dielectric constant layer such as Si: C: O or Si: O: F formed by plasma chemical vapor deposition. The passivation film 60 may be patterned to expose the surfaces of one end of the data lines and the gate lines to provide data pads and gate pads.

Alternatively, the planarization layer 65 may be further formed on the passivation film 60. The planarization layer 65 may also be formed by plasma chemical vapor deposition, like the passivation film 60, and may include a low dielectric constant layer. However, the passivation film 60 may be replaced with the planarization layer 65 by forming a film having excellent flatness or by forming an insulating film on the lower substrate 10 and subsequently planarizing it by a chemical mechanical polishing process. Thereafter, a conductive layer is formed on the passivation film 60 or the planarization layer 65 and patterned to form individual electrodes 42 each connected to the drain electrode 50D of the MOS thin film transistors. Optionally, an insulating protective film (not shown) may be further formed on the individual electrodes 42.

Referring to FIG. 2B, the barrier rib 30 is formed on the passivation film 60 or the planarization layer 65. The partition wall 30 may be formed between the individual electrodes 42. The partition wall 30 may be, for example, a polymer material such as polyethylene, polystyrene, polycarbonate, epoxy resin, silicone resin, melamine resin, acrylic resin, phenol resin, or the like, as disclosed with reference to FIG. 1B. It may include the above-mentioned surfactant primary or secondary bonded to the main chain of the resin-based polymer material, such as a combination or to the sub chain bonded to the main chain.

In some embodiments, the surfactant-based resin-based polymer material may be a photosensitive film further including a photoactive compound such as a photo active compound (PAC) or a photo acid generator (PAG). The photosensitive film may be liquid or solid, as is well known in the art. Subsequently, on the lower substrate 10 on which the driving elements 50 are formed, the photosensitive film-based resin-based polymer material combined with the surfactant is applied or laminated, and an exposure process is performed using a suitable mask, followed by development. The patterning process is performed. Thus, as shown in FIG. 1B, the partition wall 30 is formed, and the three-dimensional barrier layer 30S by the exposed surfactant 30A may be provided on the surface of the partition wall 30.

In another embodiment, a barrier rib pattern (hereinafter referred to as a barrier rib pattern) without the steric hindrance layer 30S is first formed using a photosensitive film including a resin-based polymer material that does not include the surfactant 30A, and then the interface. The activator 30A may be bonded to the surface of the barrier rib pattern to form the steric hindrance layer 30S. For example, the substrate 10 in which the barrier rib pattern is formed is immersed in a solution containing a solvent appropriately selected so that the barrier rib pattern is not dissolved and the surfactant 30A dispersed in the solvent, or the solution is applied to the substrate 10. By applying on, the steric hindrance layer 30S may be formed by inducing a primary or secondary bond of the surfactant 30A on the surfaces of the partition patterns. In another embodiment, the steric hindrance layer 30S may be formed by further adding a binder material into the solution and applying the solution onto the partition pattern.

In another embodiment, the partition 30 may include, for example, inorganic particles 30P exposed on the surface of the partition 30, as disclosed with reference to FIG. 1C. As described above, the photosensitive film may be manufactured by dispersing and mixing the inorganic particles 30P in the resin-based polymer material constituting the partition wall 30. Subsequently, the resin-based polymer material in which the inorganic particles 30P, which is the photosensitive film, is dispersed is applied or laminated on the lower substrate 10 on which the driving devices 50 are formed, and an exposure process is performed using a suitable mask. After that, by developing, the partition wall 30 can be formed. As a result, as shown in FIG. 1C, the steric hindrance layer 30S by the exposed inorganic particles 30P may be formed on the surface of the partition wall 30.

In another embodiment, the barrier rib pattern is first formed by using a resin material not including the inorganic particles 30P, and then the inorganic particles 30P are bonded to the surface of the barrier rib pattern 30S. May be formed. For example, a solution including a solvent selected appropriately so that the barrier rib pattern is not dissolved, a binder material dissolved in the solvent, and dispersed inorganic particles 30P is prepared, and the substrate 10 having the barrier rib pattern formed therein is prepared. By immersing or applying the solution onto the substrate 10 and drying it, the steric hindrance layer 30S may be formed on the partition pattern to which the inorganic particles 30P are bound. The three-dimensional blocking layer 30S formed as described above may be formed not only on the surface of the partition wall 30 but also on a region on the individual electrode 42 inside the cells.

The above-described embodiment is mainly described with respect to a partition wall forming process using a photosensitive film, but this is exemplary and the present invention is not limited thereto. Those skilled in the art will appreciate that the process of forming the partition 30 may also be formed by a screen print, a drill bit, an imprint, a softlithography, a laser drilling process, or an inkjet printing process.

Referring to FIG. 2C, the dielectric solution 71 and the electrophoretic particles 72 dispersed in the dielectric solution 71 are filled in the cells V1, V2, and V3 defined by the partition wall 30. If cells V1, V2, V3 contain the same dielectric solution and electrophoretic particles, electrophoresis dispersed in dielectric solution 71 and dielectric solution 71 by methods such as spraying and dipping with a dispenser Particles 72 may be filled into cells V1, V2, V3. However, if the composition of the dielectric solution 71 and / or the electrophoretic particles 72 is different for each of the cells V1, V2, V3, for example, for the implementation of a multi-color display device, the cells V1. If V2, V3 corresponds to any one of the red, green and blue subpixels, and it is necessary to fill the red, green and blue color particles 72R, 72G, 72B in the cells V1, V2, V3, A mask layer (not shown) that selectively opens each of the cells V1, V2, V3 is formed, and the process of filling the exposed cells is repeated several times to fill the cells with different dielectric solutions and / or electrophoretic particles. have.

Optionally, nozzles, as shown in FIG. 2C, to fill different dielectric solutions 71 and / or electrophoretic particles 72 for the cells V1, V2, V3 constituting each subpixel. An inkjet method using (N1, N2, N3) can also be used. Particles 72 dispersed in each of the cells (V1, V2, V3) may include two kinds of particles (72K; 72R, 72G, 72B) different in color and electrophoretic mobility. In the inkjet method, the nozzles N1, N2, and N3 selectively spraying droplets on the respective cells scan the lower substrate 10 in the direction of the arrow A, and the dielectric solution 71 is formed in each of the cells. The electrophoretic particles 72 may be filled. Such an inkjet method has an advantage of omitting a mask forming process.

In other embodiments, the dielectric solution 71 may be omitted to implement a dry electrophoretic display device. In this case, air or other dielectric gas may be filled together with the particles 72 in the cells V1, V2, V3 instead of the dielectric solution 71.

Subsequently, in some embodiments, as shown in FIG. 2D, the sealing layer 80 may be further formed on the cells V1, V2, V3 filled with the dielectric fluid 71 and the electrophoretic particles 72. It may be. The sealing layer 80 may be provided by, for example, further mixing the sealing layer composition in the dielectric solution 71 to fill the cells, and then separating the sealing layer composition and the dielectric solution from each other. To this end, the sealing layer material may be a suitable material having a low solubility in the dielectric solution and a specific gravity smaller than that of the dielectric solution and the electrophoretic particles. For example, the sealing layer material may include any one or a combination of UV curing compositions including acrylates, acrylate oligomers, and photoinitiators having a multifunctional group, but the present invention is not limited thereto.

After completing the light conversion layer 70 composed of the plurality of cells (V1, V2, V3), the dielectric solution 71 and the electrophoretic particles 72 defined as the partition wall 30, as shown in Figure 3f As described above, the resultant and the upper substrate 20 having the common electrode 41 formed thereon are combined with each other as shown by an arrow to complete the electrophoretic display apparatus (see 100 of FIG. 1).

Optionally, the electrophoretic display device 200 having the color filter layer 90 may be manufactured. For this purpose, the color filter layer and the common electrode are sequentially formed on the upper substrate 20, and then the upper substrate 20 is formed. And by combining the lower substrate 10 with each other.

While the above-described embodiments relate to an electrophoretic display device having a partition wall 30 including a stereoscopic barrier layer 30S, the features and advantages of the stereoscopic barrier layer are exposed in the cells, as in the following embodiments. It can be applied to other surfaces. Such embodiments will be embodied in the accompanying drawings, and the disclosure of the above-described disclosure is provided unless the description of the constituent members having the same reference numerals as the constituent members shown in these figures is inconsistent. References may be made and duplicate descriptions will be omitted.

3A to 3E are cross-sectional views illustrating electrophoretic display devices according to other embodiments of the present invention.

Referring to FIG. 3A, in the electrophoretic display device according to an embodiment, the surface of the sealing layer 80 that seals the cells V1, V2, and V3 filled with the dielectric fluid 71 and the electrophoretic particles 72. It includes a steric hindrance layer 80S for these electrophoretic particles 72. 2D is formed on the surface of the sealing layer 80 by forming the sealing layer 80 using the mixed composition obtained by adding the surfactant for providing a three-dimensional blocking layer to the sealing layer composition described above with reference to FIG. 2D. ) Can be formed.

In another embodiment, the steric hindrance layer 80S of the sealing layer 80 may include the aforementioned inorganic particles exposed on the surface of the sealing layer 80. However, since these inorganic particles may affect the displayed information, they may be determined in consideration of the refractive index and the color. For example, the inorganic particles may be selected among the transparent particles having a lower refractive index than the dielectric fluid 71 and may be appropriately selected so as not to interfere with light transmission into the dielectric fluid 71.

Referring to FIG. 3B, in the electrophoretic display device according to another exemplary embodiment, unlike the electrophoretic display device of FIG. 3A, the sealing layer 80 may be omitted. The electrophoretic display device may include a stereoscopic interference layer 41S on the upper electrode 41. For example, the steric hindrance layer 41S is formed directly on the upper electrode 41, or a protective film coated on the upper electrode 41, or a separate adhesive layer for bonding the upper substrate 20 and the partition wall 30 to each other. May be provided. For example, in order to provide the steric hindrance layer 41S on the adhesive layer, the adhesive composition obtained by dispersing the surfactant in a known resin layer for adhesive is coated on the upper substrate 20 on which the upper electrode 41 is formed. As shown in FIG. 3B, the steric hindrance layer 41S may be provided on the upper electrode 41.

Referring to FIG. 3C, the electrophoretic display device according to yet another embodiment may include a stereoscopic interference layer 42S on the lower electrode 42. The steric hindrance layer 42S on the bottom electrode 42 can be obtained by forming the bottom electrode 42 with a composition obtained by mixing a surfactant or inorganic particles for providing a steric hindrance layer to a known bottom electrode material. For example, the conductive carbon nanotubes, an appropriate binder, and a surfactant (or inorganic particles) may be mixed to form a composition for the lower electrode. Alternatively, it will be appreciated that a steric hindrance layer can be provided on the protective layer formed on the lower electrode 42.

Although the electrophoretic display device illustrated in FIG. 3C illustrates a case in which the stereoscopic interference layer 42S is selectively formed on the lower electrode 42, this is exemplary and, as described above with reference to FIG. 2B, the partition wall ( The steric hindrance layer 30S may also be formed on the surface 30. As such, FIG. 3D illustrates an electrophoretic display apparatus in which a stereoscopic barrier layer 42S is formed on both the partition wall 30 and the lower electrode 42. For example, the steric barrier layers 30S and 42S are coated by coating a composition obtained by dispersing a surfactant or inorganic particles in a suitable binder on the lower substrate 10 on which the lower electrode 42 and the partition 30 are formed. You can get it. Alternatively, the lower electrode 42 having the steric hindrance layer 42S and the steric hindrance layer 30S may be formed independently according to the above-described method.

Referring to FIG. 3E, the steric hindrance layer 44S may be separately formed on the lower electrode 42. For example, the steric hindrance layer 44S may be provided in a protective layer coated on the lower electrode 42. To this end, by coating a composition obtained by dispersing a surfactant or inorganic particles in the protective layer of the lower electrode on the lower substrate 10 having the lower electrode 42, the lower electrode 42 as shown in Figure 3e ) May be provided on the steric hindrance layer 44S.

Typically, the electrophoretic particles and other constituent members, such as a partition wall, an electrode protective layer, and an adhesive layer, which constitute the surface in the cell, are all formed of a resin-based material. In this case, due to the similarity of these materials, electrophoretic particles and other resin-based surfaces in the cells are generally of high chemical affinity. For example, when the electrophoretic particles are hydrophilic, the surface of the lower electrode may also be hydrophilic. As such, if the chemical affinity between the electrophoretic particles and these surfaces is high, the memory characteristics or non-volatile characteristics of the display information may be enhanced, which may be desirable in terms of power consumption.

However, the high chemical intimacy between the electrophoretic particles and the surfaces exposed in the cell results in an increase in drive voltage and a decrease in response speed. According to an embodiment of the present invention, the chemical intimacy between the electrophoretic particles and the exposed surface is reduced by the steric hindrance layer provided on the exposed surface in the cell, so that the electricity adheres on the lower electrode, the upper electrode and / or the partition wall. The migrating particles 72 can be easily removed from the surface. As a result, unnecessarily increased driving voltage can be reduced due to the chemical similarity of the material in the cells, and the response speed can also be improved. In this case, the steric hindrance layer also functions substantially as a control means of chemical intimacy or a drive voltage and response speed control means.

4 is a cross-sectional view illustrating an image sheet 200 according to an embodiment of the present invention. The description of the constituent members having the same reference numerals as the above-described constituent members among the constituent members shown in FIG. 4 may refer to the above-mentioned matters unless there is a contradiction, and duplicate descriptions are omitted.

Referring to FIG. 4, the image sheet 200 includes two support substrates 15 and 20 facing each other that do not include a drive element. At least one of the support substrates 15 and 20, for example, the support substrate 20 on the observer side may be a transparent substrate. In some embodiments, the support substrate 15 may include a wiring layer 46 for electrical coupling with a substrate 10 (also referred to as a backplane) on which drive elements are described below. The wiring layer 46 may include conductive patterns formed on both main surfaces of the support substrate 15 and conductive vias connecting the conductive patterns. As another example, the wiring layer 46 may not be formed on the supporting substrate 15. In this case, the individual electrodes 42 and the cells V1, V2, and V3 formed on the lower substrate 10 are electrically separated by the supporting substrate 15.

A partition wall 30, which is a separation member, may be disposed between the support substrates 15 and 20. The surface of the partition 30 is provided with a three-dimensional blockage layer (30S). The formation process of the steric hindrance layer 30S may be performed similarly to that disclosed with reference to FIG. 2B. Within each of the cells V1, V2, V3, color particles 72R, 72G, 72B may be dispersed as information display particles. In some embodiments, as shown, black particles 72a may be further dispersed. The color and type of these particles are exemplary and the present invention is not limited thereto.

As such, when the image sheet 200 is completed, the electrophoretic display device may be provided by coupling the image sheet 200 to the lower substrate 10 on which the driving elements 50 such as the active matrix layer are formed. Bonding between the image sheet 200 and the lower substrate 10 may be accomplished by an adhesive layer 85. The adhesive layer 85 may be any suitable resin-based adhesive layer or an anisotropic conductive adhesive layer. In the case where the adhesive layer 85 is an anisotropic conductive adhesive layer, the adhesive layer 85 may extend across the entire surface of these substrates between the image sheet 200 and the lower substrate 10.

The above-described image sheet 200 is illustrated with respect to the partition wall 30 having the steric hindrance layer 30S, but this is merely illustrative and the present invention is not limited thereto. For example, an image sheet including a light conversion layer 70 in which steric hindrance layers 41S, 42S, and 44S are formed on other surfaces exposed in cells as shown in FIGS. 3A to 3E is also within the scope of the present invention. Included in

FIG. 5A is a cross-sectional view illustrating an electrophoretic display device according to another exemplary embodiment. FIG. 5B is an enlarged view for describing a subpixel that may be applied to the device of FIG. 5A. For the components having the same reference numerals as those of the above-described members, reference may be made to the above-described disclosure as long as there is no contradiction, and will be omitted below.

5A and 5B, the electrophoretic display apparatus 300 may include a first substrate 10 and a second substrate 20. On these substrates 10 and 20, electrodes 41 (42R, 42G, 42B) facing each other may be formed to generate an electric field perpendicular to the main surfaces of the substrates 10, 20, respectively. As shown in FIGS. 5A and 5B, the electrophoretic display apparatus 300 may include a plurality of subpixels, which may be separated from each other by suitable spacers 66.

Unlike the electrophoretic display apparatus 100 illustrated in FIG. 1A, in the electrophoretic display apparatus 300 according to the present exemplary embodiment, cells including the electrophoretic fluid 71 and the particles 72 dispersed therein are partitioned. Not by microcapsules 35. These microcapsules 35 may be arranged in a single layer in the light conversion layer 70. Although shown as spherical, the microcapsules 35 may be shaped to have a flat cross-sectional shape with a surface having a larger projection area toward the upper substrate 20 and a pointed surface toward the lower substrate 10. Alternatively, the microcapsules 35 may be shaped to have a cuboid cross-sectional shape.

The microcapsules 35 may include, for example, chemical processes such as emulsion polymerization, interfacial polymerization, insitu polymerization; Physical processes such as co-extrusion and phase separation; In-liquid curing; And enumerated encapsulation reactions such as simple / complex coacervation. However, the present invention is not limited by these examples.

For example, the shell materials of exemplary microcapsules 35 formed by simple coacervation may include cellulose based derivatives such as gelatin, polyvinyl alcohol, polyvinyl acetate, and carbosylmethylcellulose. It may be, but is not limited to such. Exemplary capsule shell materials formed by complex coacervation include gelatin, acacia, caragenan, carboxymethylcellulose, hydrolyzed styrene anhydride copolymers, agar, casein, albumin and cellulose phthalate. It may include, but is not limited to. Exemplary capsule shell materials formed by phase separation may include, but are not limited to, polystyrene, PMMA, polyethyl methacrylate, polybutyl metal acrylate, ethyl cellulose and polyvinyl pyridine. Exemplary capsule shell materials formed by in situ polymerization may include, but are not limited to, polyhydroxyamide, melamine, urea, water soluble oligomers and vinyl monomers such as styrene and MMA. In addition, materials of exemplary capsule shells formed by interfacial polymerization may include, but are not limited to, sebacoyl, adipoyl, diamine, polyamines, alcohols, isocyanates.

Materials of the capsule shell by emulsion polymerization may include, but are not limited to, styrene, vinyl acetate, acrylic acid, butyl acrylate, t-butyl acrylate, methyl methacrylate and meth methacrylate. In addition, the capsule shell, in addition to the examples described above, may contain other water soluble polymers, water-dispersed polymers, oil soluble polymers, thermosetting resins, thermoplastic resins, and UV- or radiation curable resins. It may be.

The surface exposed in the cell as shown in FIG. 5B by mixing the surfactant or inorganic particles according to the present embodiment with the above-mentioned main materials for forming the capsule shell and performing the capsule shell forming process described above. In, a steric hindrance layer 35S for the electrophoretic particles 72 may be provided.

The microcapsules 35 arranged in the respective subpixels may be bonded onto the lower substrate 10 by an adhesive member 80 such as an adhesive layer or a binder. In another embodiment, the microcapsules 35 form a functional group capable of, for example, applying a predetermined receptor compound on each subpixel and binding to the receptor compound on the surface of the capsule 35. The capsules 35 may then be bonded by self-assembly.

In the reflective display device, according to some embodiments, the electrophoretic display device 300 may further include a front lighting member 92 composed of a light source 92a such as an LED and a light guide plate 92b.

When the particles 72 in the microcapsules 35 are black particles, the incident light i1 is absorbed by the black particles and turned off at the subpixel of the individual electrode 42R, and the adjacent individual electrode 42G is turned off. In the subpixels 42B, incident light i2 and i3 are reflected and the observer 1 observes the reflected light r2 and r3. Appropriate color filters may be disposed, or the capsules 35 may be colored with colored particles, such as red, green, and blue particles, having opposite polarities so that the capsules 35 can be colored, or behave in opposition to the black particles. In the case of further dispersing each of them, a multi-color display can be realized. For example, if the red, green and blue particles are further dispersed in the capsules 35 of the subpixels controlled by the individual electrodes 42R, 42G and 42B, respectively, the observer (when applying an electric field for the particle distribution shown) 1) can observe the color which mixed green light r2 and blue light r3 which are reflected light.

An electrophoretic display device having a capsule-shaped cell also has a separate image sheet including a light conversion layer 70 made of microcapsules, as described with reference to FIG. 4, and the image sheet is formed like an active matrix layer. The electrophoretic display device may be provided by coupling to the lower substrate 10 on which the driving devices 50 are formed.

In the above embodiment, as the member defining the cells in which the electrophoretic particles are dispersed, the partition wall or the microcapsule is described above, but the present invention is not limited thereto. For example, for microcup-structured cells formed by a press or embossing process, a steric hindrance layer may be provided for electrophoretic particles dispersed therein on the exposed surfaces of the cells.

In addition, the electrode for driving the electrophoretic particles, in addition to or in combination with the counter electrode configuration, it is understood that the known in-plane electrode configuration in which the drive electrode is formed on any one of the substrates is also within the scope of the present invention. shall. In addition, for the multi-color driving, the type and polarity of the color particles may be appropriately selected, and the above-described features related to the display device may be implemented selectively or in combination.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and alterations are possible within the scope without departing from the technical spirit of the present invention, which are common in the art. It will be apparent to those who have knowledge.

10, 20: substrate 30: partition wall
30S, 35S, 41S, 42S, 44S, 80S: solid block
41, 42: electrode 50: drive element
100, 200, 300: electrophoretic display device

Claims (21)

First and second substrates facing each other;
A plurality of cells defined by a partition wall disposed between the first substrate and the second substrate; And
At least one kind of electrophoretic particles dispersed in the plurality of cells,
A surface of the partition includes a stereoscopic barrier layer for the electrophoretic particles,
The steric hindrance layer is an electrophoretic display device comprising a surfactant exposed on the surface of the partition wall. The method of claim 1,
And a dielectric solution is filled in the plurality of cells. The method of claim 1,
The partition wall includes a resin-based polymer material,
The surfactant is an electrophoretic display device, characterized in that the primary or secondary bond to the main chain of the resin-based polymer material or to the sub chain bonded to the main chain. The method of claim 1,
The surfactant may be any one or a combination thereof selected from the group consisting of amine salts and alkyl ammonium; anionic surfactants which are any one or a combination thereof selected from the group consisting of α-olefin sulfonates, alkyl sulfate ester salts, alkyl ether sulfates and alkyl sulfonates; Or a nonionic surfactant selected from the group consisting of polyisobutylene succinimide and polyoxyethylene lauryl ether, or a combination thereof. Device. delete delete delete delete delete delete First and second substrates facing each other;
A plurality of cells disposed between the first substrate and the second substrate; And
At least one kind of electrophoretic particles dispersed in the plurality of cells,
And the surface exposed in said plurality of cells comprises a stereoscopic barrier layer for said electrophoretic particles, said stereoscopic barrier layer comprising a surfactant. The method of claim 11,
The plurality of cells is defined by partitions, microcapsules, microcups or a combination thereof,
Wherein the steric hindrance layer comprises a resin-based polymer material, and the surfactant is primary or secondary bonded to the main chain of the resin-based polymer material or to a sub chain bonded to the main chain. Forming a partition wall on the first substrate, the partition wall being spaced apart in a direction parallel to the main surface of the first substrate and including a three-dimensional interference layer on the surface;
Filling at least one kind of electrophoretic particles into a plurality of cells defined by the partition wall; And
Coupling a second substrate on the partition wall so as to face the first substrate,
The steric hindrance layer is a manufacturing method of an electrophoretic display device comprising a surfactant exposed on the surface of the partition wall. The method of claim 13, wherein forming the partition wall,
Applying or laminating a photosensitive film comprising a resin-based polymer material and a main chain of the resin-based polymer material or the surfactant bonded to the main chain on the first substrate; And
And patterning the photosensitive film, thereby exposing the surfactant to the surface to provide the particle barrier layer. 15. The method of claim 14,
The surfactant may be any one or a combination thereof selected from the group consisting of amine salts and alkyl ammonium; anionic surfactants which are any one or a combination thereof selected from the group consisting of α-olefin sulfonates, alkyl sulfate ester salts, alkyl ether sulfates and alkyl sulfonates; Or a nonionic surfactant selected from the group consisting of polyisobutylene succinimide and polyoxyethylene lauryl ether, or a combination thereof. Method of manufacturing the device. Forming a partition wall on the first substrate, the partition wall being spaced apart in a direction parallel to the main surface of the first substrate and including a three-dimensional interference layer on the surface;
Filling at least one kind of electrophoretic particles into a plurality of cells defined by the partition wall; And
Coupling a second substrate on the partition wall so as to face the first substrate,
Forming the partition wall,
Applying or laminating a photosensitive film comprising a resin-based polymer material and inorganic particles dispersed in the resin-based polymer material on the first substrate; And
And patterning the photosensitive film so that the inorganic particles are exposed on the surface to provide the particle blocking layer. 17. The method of claim 16,
The average size of the inorganic particles is a manufacturing method of an electrophoretic display device, characterized in that less than the average size of the electrophoretic particles. 17. The method of claim 16,
The inorganic particles may be titanium oxide, antimony trioxide, zinc sulfide, zinc oxide, barium sulfate, barium titanium oxide, kaolin, or kaolun. ), Silicon oxide (calcica oxide), calcium oxide (calcium oxide), calcium carbonate (CaCO ₃ ), or a method for producing an electrophoretic display device comprising a mixture composition thereof. 17. The method of claim 16,
The inorganic particles may include carbon black, copper oxide, manganese dioxide, aniline black, activated carbon, neo super black, sudan black, or a mixed composition thereof. Way. The method of claim 13, wherein forming the partition wall,
Applying or laminating a photosensitive film comprising a resin-based polymer material on the first substrate;
Forming a partition pattern on the first substrate by patterning the photosensitive film; And
By applying a solution comprising a solvent selected so that the partition pattern does not dissolve on the partition pattern, the surfactant dispersed in the solvent, by bonding the surfactant to the surface of the partition pattern primary or secondary And providing the particle blocking layer. Forming a partition wall on the first substrate, the partition wall being spaced apart in a direction parallel to the main surface of the first substrate and including a three-dimensional interference layer on the surface;
Filling at least one kind of electrophoretic particles into a plurality of cells defined by the partition wall; And
Coupling a second substrate on the partition wall so as to face the first substrate,
Forming the partition wall,
Applying or laminating a photosensitive film comprising a resin-based polymer material on the first substrate;
Forming a partition pattern on the first substrate by patterning the photosensitive film; And
The inorganic particles may be applied to the surface of the barrier rib pattern by applying a solution including a solvent selected so that the barrier rib pattern is not dissolved, a binder material dissolved in the solvent, and inorganic particles dispersed in the solvent. A method of manufacturing an electrophoretic display device comprising the step of providing the particle barrier layer by exposure.

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