JP2014142549A - Reflection type display device and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reflection type display device whose productivity is high, and which can perform multicolor display with a small color tone change, even when a display panel is observed from an oblique direction.SOLUTION: In a reflection type display device which includes a substrate having a pixel electrode and in which a reflection type display layer, a transparent electrode layer, a transparent reception layer, and a color filter layer are formed in order from the top of the pixel electrode, ruggedness corresponding to a pattern of a color filter is formed on the color filter layer forming face of the transparent reception layer.

Description

  The present invention relates to a reflective display device using a display panel that enables multicolor display by forming a color filter layer, and a manufacturing method thereof.

  As a display device, a liquid crystal display panel using a backlight is the mainstream. However, this liquid crystal display panel is heavy on the eyes and is not suitable for applications that keep watching for a long time. Therefore, a display panel having a pair of opposed electrodes and a reflective display layer provided between the electrodes has been proposed as a display device with a small eye load (see, for example, Patent Document 1).

  The reflection type display device using the display panel having the reflection type display layer displays characters and images by reflected light in the same manner as the printed paper surface. Suitable for

  One of the display methods of the reflective display device is a microcapsule electrophoresis method. This method is based on the principle that an image can be displayed by moving charged particles by applying an electric field to a dispersion liquid in which charged particles are dispersed. The microcapsule type electrophoretic reflection type display device in which colored charged particles are enclosed in microcapsules and the microcapsules are arranged between a pair of opposed electrodes has advantages such as low driving voltage and high flexibility, It has been put into practical use and is being developed further.

Japanese Patent Publication No. 50-015115

  At present, the reflective display devices are mainly two-color display mainly for black and white display, and the structure thereof is, for example, a reflective display layer, a transparent electrode, and a transparent substrate on a pixel electrode layer provided on a substrate. The material is formed in order.

  On the other hand, in recent years, what is required for a reflective display device has changed from two-color display to multicolor display (color display). In order to meet this demand, a multicolor display can be achieved by forming a color filter layer either between the reflective display layer and the transparent electrode, or between the transparent electrode and the transparent substrate, or on the transparent substrate. A reflection type display device has been devised.

  However, in the structure in which the reflective display device is multicolored by forming the color filter layer, when the distance between the patterned color filter layer and the reflective display layer is increased, the observation is performed obliquely. The problem that the color fades occurs. This problem loses the advantage of the reflective display device that the influence of the observation angle is small.

  SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a reflective display device that is highly productive and capable of multicolor display with little color change even when observed from an oblique direction, and a method for manufacturing the same.

  In order to solve the above-mentioned problem, a first aspect of the present invention is that a reflective display layer, a transparent electrode layer, a transparent receiving layer, and a color filter layer are formed in order from the top of a pixel electrode and a pixel electrode. The reflection type display device is characterized in that irregularities corresponding to the color filter pattern are formed on the color filter layer forming surface of the transparent receiving layer.

  In the first aspect, the color filter layer has, for example, a configuration in which the surface of the transparent receiving layer is colored with ink. A protective film may be further provided on the color filter layer. The thickness of the transparent receiving layer is preferably in the range of 0.1 μm to 100 μm.

  A second aspect of the present invention is a reflective display device in which a substrate including a pixel electrode and a reflective display layer, a transparent electrode layer, a transparent receiving layer, and a color filter layer are formed in this order from the top of the pixel electrode. A transparent receiving layer, a transparent electrode layer, a reflective display layer, and an adhesive layer are sequentially laminated on a concavo-convex forming surface of a substrate on which concavo-convex corresponding to a color filter pattern is formed. A step of bonding the pixel electrode surface of the substrate and the adhesive layer surface of the substrate, a step of peeling the substrate and forming irregularities corresponding to the pattern of the color filter on the transparent receiving layer, And a step of forming a color filter layer on the unevenness forming surface.

  2nd aspect WHEREIN: The peeling layer may be formed in the uneven | corrugated formation surface of a base material. Further, the step of forming the color filter layer may be performed by discharging ink to the transparent receiving layer by an ink jet printing method. The color filter layer preferably has a structure in which the surface of the transparent receiving layer is colored with ink. The thickness of the transparent receiving layer is preferably in the range of 0.1 μm to 100 μm. Furthermore, a pattern for pixel alignment may be formed on the substrate including the pixel electrode and the base material on which the unevenness is formed, and the position to be bonded by the pixel alignment pattern may be determined.

  According to the present invention, it is possible to realize a reflective display device that is highly productive and can display multicolors with little color change even when observed from an oblique direction.

Sectional drawing which showed typically the structure of the reflection type display apparatus which concerns on one Embodiment of this invention The figure explaining an example of the manufacturing method of the reflection type display apparatus which concerns on one Embodiment of this invention.

1. Structure of Reflective Display Device A structural example of the reflective display device 1 according to an embodiment of the present invention will be described with reference to FIG.
The reflective display device 1 of the present invention includes a substrate 20 on which a pixel electrode 21 is formed, an adhesive layer 30, a reflective display layer 11, a transparent electrode layer 12, a transparent receiving layer 14, color filter layers 15a, 15b, 15c, And a protective film 40.

  The reflective display layer 11 has a configuration in which microcapsules enclosing a dispersion liquid in which electrophoretic particles are dispersed in a dispersion medium are fixed with a binder resin. The reflective display layer 11 is laminated on the substrate 20 on which the pixel electrode 21 is formed via an adhesive layer 30. On the reflective display layer 11, a transparent electrode layer 12 and a transparent receiving layer 14 are sequentially laminated. The transparent receiving layer 14 is a layer in which the color filter layers 15a, 15b, and 15c are patterned, and the pattern of the pixel electrode 21 and the pattern of the color filter layers 15a, 15b, and 15c are the reflective display layer 11 and the transparent electrode layer. 12 are provided so as to coincide and face each other. A protective film 40 is formed on the transparent receiving layer 14.

  In the reflective display device 1 of the present invention, a pattern (alignment mark) 22 for pixel alignment used for pixel alignment at the time of manufacturing a reflective display device described later is provided on the substrate 20. In the reflective display device 1, a sealing layer 50 for preventing moisture from entering the reflective display layer 11 may be provided on the side surface of the reflective display layer 11.

2. Method for Manufacturing Reflective Display Device An example of a method for manufacturing the reflective display device 1 according to an embodiment of the present invention will be described with reference to FIG.
First, as shown in FIG. 2A, the transparent receiving layer 14 and the transparent electrode layer 12 are formed on the base material 13 on which the irregularities and the alignment marks 22 that form the patterns of the color filter layers 15a, 15b, and 15c are formed. The laminated film 10 is prepared by sequentially laminating the reflective display layer 11, the adhesive layer 30, and the release conductive release layer 31. In addition, the substrate 20 on which the pixel electrode 21 and the alignment mark 22 are formed is prepared.

  Next, as shown in FIG. 2B, the release conductive release layer 31 of the laminated film 10 is peeled off, and the surface of the adhesive layer 30 of the laminated film 10 and the surface of the pixel electrode 21 of the substrate 20 are bonded together. At this time, alignment of the laminated film 10 and the substrate 20 is performed by aligning the alignment mark 22 of the base material 13 with the alignment mark 22 of the substrate 20. Thereby, the uneven | corrugated pattern of the transparent receiving layer 14 of the laminated | multilayer film 10 and the pattern of the pixel electrode 21 of the board | substrate 20 can be bonded together. And the base material 13 is peeled from the laminated | multilayer film 10 bonded together to the board | substrate 20, and the transparent receiving layer 14 is exposed.

  Next, as shown in FIG. 2 (c), two or more types of ink are ejected to the exposed transparent receiving layer 14 by ink jet printing to form color filter layers 15a, 15b, 15c on the transparent receiving layer 14. To do. In the example of FIG. 2C, a red color filter layer 15a, a blue color filter layer 15b, and a green color filter layer 15c are formed. In forming the color filter layers 15a, 15b, and 15c, it is necessary to make the pattern of the pixel electrode 21 on the substrate 20 correspond to the pattern of the color filter layers 15a, 15b, and 15c. In the method of manufacturing the reflective display device 1 of the present invention, the color filter after the laminated film 10 and the substrate 20 are bonded together by not disposing the reflective display layer 11 above the alignment mark 22 for pixel alignment. In the layer forming step, the pattern of the color filter layers 15a, 15b, and 15c corresponding to the pattern of the pixel electrode 21 can be easily formed using the alignment mark 22 as a reference. Moreover, since the unevenness | corrugation corresponding to the pattern of the color filter layers 15a, 15b, and 15c is previously formed in the surface of the transparent receiving layer 14, the square shape which was difficult with the inkjet printing method can be formed easily.

  Finally, as shown in FIG. 2D, the reflective display device 1 is manufactured by bonding a protective film 40 provided with an adhesive layer on the color filter layers 15a, 15b, and 15c.

3. Operational Principle of Reflective Display Device The operational principle of the reflective display device 1 of the present invention will be described.
Each of the pixel electrodes 21 on the substrate 20 is connected to a switching element, and a positive or negative voltage can be applied to the transparent electrode layer 12. In order to display an image, the pixel electrode 21 is usually connected to a voltage supply circuit of an active matrix driving method. When a voltage is applied to the pixel electrode 21, the electric field applied to the reflective display layer 11 varies. When the pixel electrode 21 is a positive electrode, the negatively charged particles in the microcapsule move to the pixel electrode 21 side on the back of the device, and the positively charged particles in the microcapsule It moves to the transparent electrode layer 12 side. Similarly, when the pixel electrode 21 becomes a negative electrode, positively charged particles move to the pixel electrode 21 side, and negatively charged particles move to the transparent electrode layer 12 side.

  Here, the display color depends on the color of the particles moved to the transparent electrode layer 12 side. Therefore, for example, the black particles are positively charged, the white particles are negatively charged, and the white particles moving to the transparent electrode layer 12 side are controlled so that only the white particles out of the light incident from the observation side are reflected. The reflected light thus transmitted can be transmitted through a desired coloring pattern of the color filter layers 15a, 15b, and 15c, and desired characters and images can be displayed in color.

  In the reflective display device 1 of the present invention, only the transparent electrode layer 12 and the transparent receiving layer 14 exist between the reflective display layer 11 and the color filter layers 15a, 15b, and 15c. Since the thickness of the transparent electrode layer 12 is on the order of submicrons, the distance between the reflective display layer 11 and the color filter layers 15a, 15b, and 15c is determined by the thickness of the transparent receiving layer 14. Therefore, by reducing the thickness of the transparent receiving layer 14, the distance between the reflective display layer 11 and the color filter layers 15a, 15b, and 15c can be made closer, and the color changes even when observed from an oblique direction. Multicolor display with a small size is possible.

  In the method of manufacturing the reflective display device 1 of the present invention, the color filter layers 15a, 15b, and 15c are formed by ejecting a plurality of colors of ink to the transparent receiving layer 14 by an ink jet printing method. It is preferable. Since the transparent receiving layer 14 is patterned in advance so as to match the color filter layer, it is possible to easily form a rectangular shape, which is difficult to control by ink jet printing in which ink is discharged in a spherical shape, and to reflect with high lightness. The mold display device 1 can be realized.

  Further, after the laminated film 10 and the substrate 20 are bonded together, the base material 13 of the laminated film 10 is peeled off, and the color filter layers 15 a, 15 b, and 15 c are formed on the surface of the transparent receiving layer 14. Accordingly, in consideration of damage to the panel in which the laminated film 10 and the substrate 20 are bonded, the color filter layers 15a, 15b, and 15c are formed by ejecting a plurality of colors of ink by a non-contact ink jet printing method. It is preferred that

  In the reflective display device 1 of the present invention, the protective film 40 is further laminated on the color filter layers 15a, 15b, and 15c. By providing the protective film 40, the scratch resistance of the reflective display device 1 can be improved.

In the reflective display device 1 and the method for manufacturing the same according to the present invention, it is preferable that the transparent receiving layer 14 has a thickness in the range of 0.1 μm to 100 μm. As described above, in the present invention, the distance between the reflective display layer 11 and the color filter layers 15a, 15b, and 15c is determined by the thickness of the transparent receiving layer. Therefore, if the thickness of the transparent receiving layer 14 is within the above-described numerical range, the printing position of the color filter layer can be easily aligned, the productivity is improved, and the color change is reduced when observed from an oblique direction. be able to.
On the other hand, when the thickness of the transparent receiving layer 14 exceeds 100 μm, a change in color becomes large when observed from an oblique direction. Further, if the thickness of the transparent receiving layer 14 is less than 0.1 μm, the ink may not be sufficiently received when forming the color filter layer, and the pattern may be broken.

Hereinafter, the reflective display device 1 and the method for manufacturing the same according to an embodiment of the present invention will be described in more detail.
As the base material 13 with irregularities formed, a metal plate such as aluminum or copper, a glass substrate such as soda glass or non-alkali glass, polyethylene terephthalate, polyethylene naphthalate, polyethersulfone, cycloolefin polymer, polyimide, nylon, aramid It is possible to process and use a film substrate such as polycarbonate, polymethyl methacrylate, polyvinyl chloride, or triacetyl cellulose. A glass substrate is most preferable from the viewpoint of facilitating alignment at the time of bonding and dimensional stability.

As a pattern processing method of the base material 13, a photosensitive resin is applied to the substrate surface, and after pattern formation and development processing by exposure processing through a mask, existing dry etching processing, wet etching processing, or sand blast processing is used. Then, after processing the substrate to a depth corresponding to the film thickness of the transparent receiving layer 14 to be formed, a method of peeling and forming this photosensitive resin can be used.
Alternatively, as a pattern processing method for the base material 13, a photosensitive resin is applied to the substrate surface with a thickness corresponding to the film thickness of the transparent receiving layer 14 to be formed and the pattern of the color filter layers 15 a, 15 b, and 15 c, and the mask is interposed. A method of curing the photosensitive resin after pattern formation and development processing by the exposed exposure processing can be used.

  The pattern of the base material 13 is a pattern in which 50 to 500 μm square patterns corresponding to the pixel size are arranged at equal intervals of 5 to 50 μm according to the pattern of the color filter layers 15 a, 15 b and 15 c to be formed. . The pixel area is processed to a depth of 0.1 to 100 μm according to the film thickness of the transparent receiving layer 14.

  A release layer is provided on the substrate 13. For the release layer, a release agent represented by silicone oil or silicone varnish may be used, or a thin silicone rubber may be provided. For the same purpose, fluorine-based resin or fluorine-based rubber can be used, or the fluororesin fine powder can be mixed with silicone rubber or ordinary rubber to obtain peelability. The thickness of the release layer may be set to about 0.05 to 5 μm, as long as the transparent receiving layer 14 can be uniformly applied and the release layer can be exhibited when bonded to the substrate 20 on which the pixel electrode 21 is formed. Preferably it is done.

  Specific silicones include dimethylpolysiloxanes of various molecular weights, other methylhydrogen polysiloxanes, methylphenyl silicone oils, methyl chlorinated phenyl silicone oils, or copolymers of these polysiloxanes with organic compounds. Can be used. Silicone rubber is a combination of two-component diorganopolysiloxane and a trifunctional or higher functional silane as a crosslinking agent, or a combination of siloxane and a curing catalyst, or one-component diorganopolysiloxane, acetone oxime, various methoxys Combinations of silane, methyltriacetoxysilane, and the like are used, and other polysiloxanes for adjusting rubber hardness are appropriately used.

  As a method for forming the release layer described above on the substrate 13, a known coating method can be used depending on the viscosity of the ink and the drying property of the solvent. Examples thereof include spin coating, dipping method, roll coating, gravure coating, reverse coating, air knife coating, comma coating, die coating, screen printing method, spray coating, gravure offset method and the like. Among these, a die coat, a cap coat, a roll coat, and an applicator can form a uniform ink liquid film with respect to an ink having a wide range of viscosity.

  The transparent receiving layer 14 formed on the substrate 13 is formed by applying a receiving layer forming coating liquid containing a resin on the transparent substrate. As the transparent receiving layer 14, urethane resin, polyester, acrylic resin, vinyl alcohol resin, or the like can be used, and a porous substance such as synthetic silica or alumina can be included in order to increase the absorbability of the ink solvent. The transparent receiving layer 14 can be formed by a screen printing method, an offset printing method, a spin coating method, or intermittent coating using a die, as long as sheet processing is performed. In addition, if continuous processing is performed by roll-to-roll, a receiving layer can be formed by general-purpose coating techniques such as die coating, comma coating, curtain coating, and gravure coating. Moreover, after the coating liquid for forming the receiving layer is applied, the coating liquid on the transparent substrate is dried. As a drying method, heating, blowing, or the like can be used. The transparent receiving layer 14 is preferably formed by continuous coating by a roll-to-roll method.

  As a material for the transparent electrode layer 12 formed on the transparent receiving layer 14, a conductive oxide having transparency such as indium oxide, tin oxide, and zinc oxide, such as ITO, or carbon nanotube or thiophene A compound or the like can be used. The transparent electrode layer 12 can be formed by a conventional technique such as a dry film forming method such as a vapor deposition method, a sputtering method, or a CVD method, or a wet film forming method using a coating liquid.

  The reflective display layer 11 formed on the transparent electrode layer 12 is a reflective display layer forming coating containing a microcapsule enclosing a dispersion liquid in which electrophoretic particles are dispersed in a dispersion medium, a binder resin, and a solvent. It is formed by applying the liquid on a transparent substrate provided with a transparent electrode. The microcapsule has a structure in which at least two kinds of particles having different electric polarities are dispersed in a transparent dispersion medium in a shell. Examples of the two types of particles having different electric polarities enclosed in the microcapsule include a combination of black particles and white particles. It is preferable to use a microcapsule that has been purified by a sieving method, a specific gravity separation method, or the like and has an average particle diameter of 30 to 100 μm. Moreover, it is preferable that the ratio of the microcapsule having a particle size within 10 μm before and after the average particle size of the microcapsule exceeds at least 50%.

  For the microcapsule dispersion, an aqueous solvent such as alcohol is used, and water is used if there is no particular problem. As the dispersion medium, for example, an aliphatic hydrocarbon, an aromatic hydrocarbon, an alicyclic hydrocarbon, a halogenated hydrocarbon, various esters, an alcohol-based solvent, or other transparent oils alone or appropriately mixed Is used.

  In addition to inorganic pigments such as inorganic carbon, fine particles such as glass or resin, and composites thereof can be used for the black particles. On the other hand, as the white particles, known white inorganic pigments such as titanium oxide, silica, alumina, and zinc oxide, organic compounds such as vinyl acetate emulsion, and composites thereof can be used. In addition, black particles and white particles may impart desired surface charges by treating the surface of the particles with various surfactants, dispersants, organic and inorganic compounds, metals, and the like as necessary. In addition, the dispersion stability in the dispersion medium can be improved.

  The dispersion in which the microcapsules are dispersed is enclosed in a microcapsule capsule shell using a known method such as a phase separation method such as a mixed coacervation method, an interfacial polymerization method, an in-situ method, or a solution-dispersion cooling method. It becomes a capsule. For the microcapsule shell, for example, rubber or gelatin can be used.

  Dielectric resins such as polylactic acid, phenol resin, polypropylene resin, and acrylic resin can be used as the binder resin contained in the reflective layer forming coating solution. As a coating method of the reflective layer forming coating liquid, a coating apparatus such as a screen printing method, a micro gravure coater, a kiss coater, a comma coater, a die coater, a bar coder, or a curtain coater can be used. After the reflective layer forming coating solution is applied, the coating solution on the transparent electrode layer is dried. As a drying method, heating, blowing, or the like can be used.

  The adhesive layer 30 formed on the reflective display layer 11 is separated from the transparent conductive film of the laminated film 10 when a layer formed in advance on the release conductive film is bonded to the reflective display layer 11 side of the laminated film 10. A voltage can be applied between the reflective conductive layer and the reflective display layer 11 to perform a defect inspection, which is preferable. At this time, it is preferable to use a synthetic resin adhesive such as a urethane resin adhesive or an acrylic resin adhesive that can be used as an adhesive. In particular, an adhesive using a high dielectric resin is preferably used. Examples of the release conductive film include an ITO layer and a metal thin film.

  Color filter layers 15 a, 15 b, and 15 c are provided on the unevenness forming surface of the transparent receiving layer 14. The color filter layers 15a, 15b, and 15c are formed by applying a plurality of inks to the transparent receiving layer. Since the surface of the transparent receiving layer 14 has uneven portions corresponding to the pattern of the color filter, it is possible to perform fine shape control that is difficult with the ink jet printing method.

  As the ink for forming the color filter layers 15a, 15b, and 15c, an ink containing a known color pigment or color dye can be used. The color filter layers 15a, 15b, and 15c color light for each pixel, and are three-color patterns of red (R), green (G), and blue (B), or yellow (Y), magenta (M), A three-color pattern of cyan (C) can be used. Moreover, the combination of these colors may be sufficient and other colors, such as white (W), may be combined.

  Specific examples of the coloring pigment component include red coloring compositions for forming red coloring layers or red pixels. I. Pigment Red 7, 9, 14, 41, 48: 1, 48: 2, 48: 3, 48: 4, 81: 1, 81: 2, 81: 3, 97, 122, 123, 146, 149, 168, 177, 178, 179, 180, 184, 185, 187, 192, 200, 202, 208, 210, 215, 216, 217, 220, 223, 224, 226, 227, 228, 240, 246, 254, 255, Red pigments such as H.264, 272, and 279 can be used. A yellow pigment and an orange pigment can be used in combination with the red coloring composition.

  Examples of the green coloring composition include C.I. I. Green pigments such as Pigment Green 7, 10, 36, and 37 can be used. The green coloring composition can be used in combination with the same yellow pigment as the red coloring composition.

  Examples of the blue coloring composition include C.I. I. Pigment Blue 15, 15: 1, 15: 2, 15: 3, 15: 4, 15: 6, 16, 22, 60, 64, 80, etc., preferably C.I. I. Pigment Blue 15: 6 can be used. In addition, C.I. I. Pigment Violet 1, 19, 23, 27, 29, 30, 32, 37, 40, 42, 50 and the like, preferably C.I. I. Pigment Violet 23 can be used in combination.

  In the color filter layers 15a, 15b, and 15c of the present invention, a black matrix for separating each pixel with black is not formed. Therefore, in the present invention, the transparent receiving layer 14 is formed when the color filter layers 15a, 15b, and 15c are formed, and ink is ejected into the transparent receiving layer 14 by an ink jet printing method to form a color filter. This method has the highest productivity and can be suitably used.

  As a method for applying the ink to the transparent receiving layer 14, since it is necessary to separate the colors, it is possible to use a screen printing method, an offset printing method, an ink jet printing method, or the like. Among them, since alignment is easy, a method of ejecting ink to the transparent receiving layer 14 using an ink jet printing method to form a color filter layer is preferable.

  A known substrate can be used as the substrate 20 including the pixel electrode 21. Each pixel electrode 21 is connected to a switching element, and a positive and negative voltage can be applied between the pixel electrode 21 and the transparent electrode layer 12. The pixel electrode 21 is connected to an active matrix type voltage supply circuit. As the alignment pattern (alignment mark) 22 provided on the substrate 20, a pattern can be formed on the edge of the substrate 20 simultaneously with the formation of the pixel electrode 21. Examples of the alignment pattern include a cross shape, a round shape, a multiple concentric circle shape, and a wedge shape.

  As the protective film 40, a material shown as a transparent substrate, that is, a plastic film such as polyethylene terephthalate (PET), polycarbonate, polyimide, polyethylene naphthalate, polyethersulfone, acrylic resin, polyvinyl chloride, or glass is used. be able to. In addition, the protective film 40 contains a hard coat layer for improving the scratch resistance of the surface on the viewer side, an antireflection layer for preventing the reflection of the surface, and a metal component considering moisture resistance. A thin film layer may be provided. The transparent receiving layer 14 and the protective film 40 are bonded together with a known adhesive.

  The sealing layer 50 sandwiching the macrocapsules of the reflective display layer 11 may be a thermoplastic resin, such as polyolefin resin, polyester resin, polyamide resin, polyurethane resin, polysilicone-based sealant, or thermosetting resin epoxy resin. Urethane resin, melamine resin, phenol resin, acrylic resin-based sealant, and the like can be used.

4). EXAMPLE A titanium oxide powder (white particles) having an average particle diameter of 3 μm whose surface is coated with a polyethylene resin and a carbon black powder (black particles) having an average particle diameter of 4 μm which has been surface-treated with alkyltrimethylammonium chloride are dispersed in tetrachloroethylene. Prepare a dispersion. In this case, the white particles are negatively charged and the black particles are positively charged. This dispersion was O / W emulsified and microcapsules were formed by a complex coacervation method using gelatin-gum arabic, whereby the dispersion was enclosed in the microcapsules. The microcapsules thus obtained were sieved, and the particle diameters were adjusted so that the ratio of microcapsules having an average particle diameter of 60 μm and a particle diameter of 50 to 70 μm was 50% or more.

  Next, an aqueous dispersion of microcapsules having a solid content of 40% by mass was prepared. The aqueous dispersion, a urethane binder having a solid content of 25% by mass (CP-7050, manufactured by Dainippon Ink Co., Ltd.), a surfactant, a thickener, and pure water are mixed, and a reflective display layer is mixed. A forming coating solution was prepared.

  The base material for forming the reflective display layer was formed as follows. A positive resist (Shipley, S1813) is applied to alkali-free glass (Corning, 1737 glass, 300 mm square, 1.1 mm thick) by spin coating, exposed through a mask, and an alkali developer (Shipley, By performing development with MFCD-26), a pattern according to the color filter layer was formed. The opening of this pattern was etched with hydrofluoric acid to a depth of 5.0 μm, and the resist was stripped with a resist stripping agent (manufactured by Shipley, remover 1165) to obtain an uneven substrate. A fluorinated water repellent treatment agent (manufactured by 3M, EGC-1720) was dip coated on the glass intaglio, and a release layer was provided by drying treatment at 80 ° C. for 30 minutes.

  A polyester resin-based receiving liquid NS-141LX (Takamatsu Yushi Co., Ltd.) was coated on this substrate using a die coater to form a transparent receiving layer having an average film thickness of 10 μm. Next, an ITO layer was formed on the transparent receiving layer by a wet film forming method to obtain a substrate composed of a metal plate / silicone layer / receiving layer / ITO layer.

  Subsequently, a microcapsule ink is applied to the ITO layer side of the obtained film by a die, and an aluminum release with silicone with urethane adhesive is bonded to the microcapsule surface, and a metal plate / silicone layer / receiving layer A laminated substrate consisting of / ITO layer / microcapsule type reflective display layer / aluminum release layer with silicone was obtained.

A voltage was applied between the ITO layer and the aluminum release layer of the obtained multilayer substrate, the reflective display layer was driven, and display defect inspection was performed.
Further, the obtained multilayer substrate was cut into a size smaller than the substrate provided with the pixel electrode using a CO2 laser cutting device.
Then, the silicon release aluminum release film on the adhesive side of the laminated substrate obtained is peeled off, the pixel electrode connected to the active matrix type driving system circuit using the thin film transistor, and the full width 500 um line for alignment at the end A reflective display substrate with a receiving layer was obtained by laminating to a substrate having a cross pattern with a width of 200 μm by lamination.

  The substrate on the transparent receiving layer side of the reflective display substrate with the receiving layer was peeled off, and ink-jet printing was used on the transparent receiving layer to perform color-coded printing for each pixel to form a color filter layer. At this time, alignment was performed by a cross pattern for alignment on the substrate. The color filter layer was a red, blue, and green pattern. Finally, an adhesive hard coat film KB stick SG90R (Kimoto Co., Ltd.) was laminated on the transparent receiving layer as a protective film.

Thus, a reflective display device was produced.
When a voltage was applied to each pixel in the manufactured reflective display device, color display could be performed. In addition, since the rectangular color filter was formed by the unevenness formed in the transparent receiving layer, and the reflective layer and the color filter layer were close to each other, no color unevenness due to parallax was observed.

  INDUSTRIAL APPLICABILITY The present invention is useful for a reflective display device using a display panel that enables multicolor display by forming a color filter layer.

DESCRIPTION OF SYMBOLS 10 Laminated | multilayer film 11 Reflective display layer 12 Transparent electrode layer 13 Base material 14 Transparent receiving layer 15a, 15b, 15c Color filter layer 20 Substrate 21 Pixel electrode 22 Pattern for pixel alignment 30 Adhesive layer 31 Release conductive release 40 Protection Film 50 sealing layer

Claims (10)

A reflective display device in which a substrate including a pixel electrode and a reflective display layer, a transparent electrode layer, a transparent receiving layer, and a color filter layer are formed in order from the top of the pixel electrode,
The reflective display device is characterized in that irregularities corresponding to a color filter pattern are formed on a color filter layer forming surface of the transparent receiving layer.   2. The reflective display device according to claim 1, wherein the color filter layer has a configuration in which the surface of the transparent receiving layer is colored with ink.   The reflective display device according to claim 1, wherein a protective film is further formed on the color filter layer.   The reflective display device according to claim 1, wherein a thickness of the transparent receiving layer is in a range of 0.1 μm to 100 μm. A method of manufacturing a reflective display device in which a substrate including a pixel electrode and a reflective display layer, a transparent electrode layer, a transparent receiving layer, and a color filter layer are formed in order from the top of the pixel electrode,
A step of sequentially laminating the transparent receiving layer, the transparent electrode layer, the reflective display layer, and an adhesive layer on the concavo-convex forming surface of the substrate on which the concavo-convex corresponding to the pattern of the color filter is formed;
Bonding the pixel electrode surface of the substrate and the adhesive layer surface of the substrate;
Peeling the base material to form irregularities corresponding to the pattern of the color filter in the transparent receiving layer;
And a step of forming a color filter layer on the concave / convex forming surface of the transparent receiving layer.   The method for manufacturing a reflective display device according to claim 5, wherein a release layer is formed on the unevenness forming surface of the base material.   The method for manufacturing a reflective display device according to claim 5, wherein the step of forming the color filter layer is performed by discharging ink to the transparent receiving layer by an ink jet printing method.   The method of manufacturing a reflective display device according to claim 7, wherein the color filter layer has a configuration in which the surface of the transparent receiving layer is colored with ink.   The method of manufacturing a reflective display device according to claim 5, wherein the transparent receiving layer has a thickness in a range of 0.1 μm to 100 μm.   A pattern for pixel alignment is formed on each of the substrate including the pixel electrode and the base material on which the unevenness is formed, and a position to be bonded is determined by the pattern for pixel alignment. A method of manufacturing a reflective display device according to claim 5, wherein the method is characterized in that:

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