JP2011065033A - Multi-panel color-filter electrophoretic front panel, method for manufacturing the same, and method for manufacturing multicolor display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multi-panel color filter electrophoretic front panel for a multicolor microcapsule type electrophoretic display panel, which prevents a reduction in display brightness and viewing angle. <P>SOLUTION: The multi-panel color filter electrophoretic front panel is formed by stacking: two or more color filter layers formed on a transparent substrate; a continuous transparent electrode layer provided on the color filter layers and between the color filter layers; at least, a microcapsule layer which is directly stacked on the transparent electrode layer on the color filter later and which is formed by dispersing the microcapsule in a binder resin, the microcapsule containing a dispersion liquid obtained by dispersing electrophoretic particles in a transparent dispersion medium and changing the optical reflection characteristics by the change of an electric field when a voltage is applied; and a releasable resin substrate with a conductive layer, which is stacked on the microcapsule layer through an adhesive layer. The conductive layer is continuously formed in a position to be paired with the transparent electrode layer. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a multi-faceted color filter electrophoretic front plate used for manufacturing a multicolor microcapsule type electrophoretic display panel and a method for manufacturing the same, and further relates to a method for manufacturing a multicolor display panel using the same. .

  In recent years, with the development of information equipment, information display has been made in various forms. As a display panel for variable information, a liquid crystal using a CRT (cathode ray tube) or a backlight is mainly used. However, light-emitting displays such as CRTs and backlight-type liquid crystal displays are not suitable for long-term use, which can cause eye strain that can cause significant eye fatigue and keep reading documents etc. for a long time. .

  In addition, a liquid crystal display of a type that does not use a backlight has a problem that the darkness of the screen due to the use of a polarizing plate appears remarkably and the visibility is poor. Furthermore, the display images on these displays do not have memory characteristics, and the display images disappear at the same time as the electrical energy supply is stopped. There is a need for a device that is less likely to cause fatigue on the eyes even when used for a long time, has good visibility, consumes less power, and has image memory properties.

  Therefore, as a reflective display device with a small eye load, for example, as disclosed in Patent Document 1, a display panel having a pair of opposed electrodes and an electrophoretic display layer provided between the electrodes is provided. It has been proposed as an electrophoretic display panel. Since this electrophoretic display panel displays characters and images by reflected light, as with the printed paper, it is suitable for work that keeps the screen looking for a long time with little load on the eyes.

  This electrophoretic display panel is based on the principle that an image can be displayed by moving charged particles by applying a voltage to a dispersion liquid in which charged particles are dispersed to change an electric field. Among electrophoretic display panels, microcapsule-type electrophoretic display panels in which colored charged particles are enclosed in microcapsules and the microcapsules are arranged between a pair of opposing electrodes are low driving voltage, high flexibility, etc. Has been commercialized and further developed.

  In addition to the displays of portable information devices such as so-called PDAs (Personal Digital Assistants) and electronic books that will become more widespread in the future, printed materials such as newspapers, books, magazines, and posters, as well as hardware output from printers to paper This electrophoretic panel is suitable for replacing a copy with a display display. The electrophoretic panel generally has a two-color display mainly for monochrome display because of its structure. However, in order to display the above-mentioned magazines and color prints, a multicolor display has recently been required.

  In order to make this electrophoretic panel multi-colored, two or more types of multi-color electrophoretic particles are used. For example, in Patent Document 2, patterning is performed by a photolithography method, and in Patent Document 3, in addition to the photolithography method. A technique for disposing electrophoretic particles in predetermined pixels using an inkjet method is disclosed. Further, Patent Document 4 discloses a display panel capable of displaying a plurality of colors by forming a cell frame that accommodates microcapsules in advance and securely installing a plurality of microcapsules at desired positions. However, disposing multi-color microcapsules in predetermined pixels has a lot of processes and complicated technical difficulties as compared with a normal photoresist or the like.

  For this reason, Patent Document 5 discloses a method capable of multi-color display by attaching a color filter substrate on a black and white electrophoretic display panel so that the positional accuracy between the microcapsules and the pixels is not required. However, in this method, a separate color filter substrate is pasted on a monochrome electrophoretic display panel, which is a reflective display panel. There is a problem that the productivity is low due to the decrease in brightness and the difficulty in bonding the color filter substrates.

  Furthermore, since there is a distance between the color filter layer and the electrophoretic display layer, color parallax occurs depending on the viewing angle, and the advantage of electronic paper that there is no influence of the viewing angle is lost. In order to solve the above problems, the brightness of the display and the viewing angle are improved by optimizing the color filter, but the actual situation is that the improvement has not been achieved.

Japanese Patent Publication No. 50-015115 JP 2002-365668 A JP 2003-156770 A JP 2003-295234 A JP 2003-161964 A

  The present invention has been made in view of the above circumstances, and can be applied to the production of a multicolor microcapsule type electrophoretic display panel in which the problems of lowering display brightness and narrowing the viewing angle are improved, and It is an object of the present invention to provide a multi-sided color filter electrophoresis front plate essential for the spread of color electronic paper and a method for manufacturing the same, and to provide a method for efficiently manufacturing a multi-color display panel using the same.

  According to the first aspect of the present invention, two or more color filter layers separated in a plane are formed on a transparent substrate, and the transparent electrode layer is continuous on the color filter layer and the color filter layer. And a microcapsule layer is directly laminated on at least the transparent electrode layer on the color filter layer, and the microcapsule layer is configured by dispersing microcapsules in a binder resin. In addition, a dispersion liquid in which electrophoretic particles are dispersed in a transparent dispersion medium is encapsulated, and the optical reflection characteristics change due to an electric field change caused by application of a voltage. Further, an adhesive layer is interposed between the microcapsule layer and A multi-faceted color filter electrophoresis front plate in which a peelable resin substrate on which a conductive layer is formed is laminated, wherein the conductive layer is the color filter Before the multi-sided color filter electrophoresis method, wherein the multi-sided color filter electrophoresis method is characterized by being continuously connected to the transparent electrode layer on the filter layer and the transparent electrode layer on the color filter layer. It is a face plate.

The invention according to claim 2 of the present invention is characterized in that the electrophoretic particles are particles having two different surface charges, one of which is a colored particle and the other is a white particle. 1 is a front surface plate of a multi-surface color filter electrophoresis system described in 1.

  Next, the invention according to claim 3 of the present invention includes (a) a step of providing two or more color filter layers separated in a plane on a transparent substrate, and (b) the color filter layer and the color. A step of providing a continuous transparent electrode layer on the filter layer; and (c) a voltage in which a dispersion liquid in which electrophoretic particles are dispersed in a transparent dispersion medium is sealed on at least the transparent electrode layer on the color filter layer. A step of forming a microcapsule layer in which microcapsules whose optical reflection characteristics change due to an electric field change due to application of the resin are dispersed in a binder resin, and (d) the color filter layer through the adhesive layer on the microcapsule layer Laminating a peelable resin substrate on which a conductive layer is formed continuously connected to a position paired with the transparent electrode layer and a position paired with the transparent electrode layer on the color filter layer A step, a multifaceted with color filters electrophoretic method for producing a front plate, characterized in that it comprises a.

  Furthermore, in the invention according to claim 4 of the present invention, a voltage is applied between the transparent electrode layer and the conductive layer of the multifaceted color filter electrophoresis front plate according to claim 1 or 2, A step of collectively evaluating the driving of the microcapsule layer by multi-sided attachment, a step of separating the multi-sided color filter electrophoresis type front plate, and a peelable resin substrate on which the conductive layer is formed from the adhesive layer A multicolor process comprising a step of peeling and removing, and a step of bonding the microcapsule layer to a pixel electrode surface of a back electrode plate on which a pixel electrode is disposed on a back substrate, through the adhesive layer. It is a manufacturing method of a display panel.

  In the multi-sided color filter electrophoresis front plate of the present invention (hereinafter abbreviated as multi-sided front plate), the conductive layer of the peelable resin substrate laminated on the microcapsule layer with an adhesive layer is a color layer. Since it is formed continuously connected to the position where it is paired with the transparent electrode layer on the filter layer and the position where it is paired with the transparent electrode layer on the color filter layer, quality inspection of the front plate There is no need to drive every time, and multiple drive quality inspections can be performed at once. That is, before manufacturing as a final multicolor display panel laminated with a TFT (Thin film transistor) substrate or the like, it is possible to evaluate the drive of a capsule-type electrophoretic layer with a multi-sided color filter, which is suitable for quality confirmation. Only good products can be selected and bonded to the TFT. Note that after bonding to the TFT, the panel can be selected based on the above-described inspection result, and multi-faceted production can be performed on a substrate having a large color filter, which increases the production efficiency.

  Further, the multi-faced front plate of the present invention is such that the microcapsule layer is directly formed on the transparent electrode layer on the color filter layer. When a display panel is formed by bonding to the pixel electrode surface of the electrode plate, the distance between the microcapsule layer, which is the display surface, and the color filter layer is very close. As a result, an unnecessary layer such as an adhesive does not exist between the microcapsule layer and the color filter layer as compared with a conventional display panel formed by laminating a separately prepared color filter substrate, and reflected by the microcapsule layer. The reflected light passes through the minimum layer, and the display brightness is improved as compared with the conventional display panel.

  In addition, regarding the display of the microcapsule layer and the displacement of the color filter that are observed when the distance between the color filter layer and the microcapsule layer is increased, the parallax as described above is observed by the microcapsules being in close contact with the color filter layer. In other words, the viewing angle is not pinched.

BRIEF DESCRIPTION OF THE DRAWINGS Schematic explaining the structural example which concerns on one Embodiment of the multifaceted color filter electrophoresis system front plate of this invention in a cross section. Schematic explaining the other structural example which concerns on one Embodiment of the multi-faced color filter electrophoresis system front plate of this invention in a cross section. The schematic diagram explaining the structure of the multicolor display panel which concerns on this invention in an expanded cross section.

  The manufacturing method of the multicolor display panel of this invention is demonstrated in detail below based on one Embodiment.

  FIG. 1 is a schematic view illustrating a cross-sectional configuration example according to an embodiment of the multi-faced front plate of the present invention, and FIG. 2 is a cross-sectional view illustrating another configuration example according to an embodiment of the front plate of the present invention. FIG. FIG. 3 is a schematic diagram for explaining the configuration of the multicolor display panel according to the present invention in an enlarged cross section. As shown in FIGS. 1 and 2, the multi-faced front plate of the present invention includes two or more color filter layers (2) separated in a plane on the transparent substrate (1), and the color filter layer. And a continuous transparent electrode layer (4) between the color filter layers, and a microcapsule layer (10) is directly laminated on at least the transparent electrode layer (4) on the color filter layer. A peelable resin in which a conductive layer (18) and a peelable layer (17) are formed on a peelable substrate (19) via an adhesive layer (16) on the microcapsule layer (10) of the color filter with microcapsules. The front plate of the present invention is configured by laminating the substrate (20).

  Here, as shown in FIG. 3, the microcapsule layer (10) encloses a dispersion in which electrophoretic particles composed of colored particles (6) and white particles (7) are dispersed in a transparent dispersion medium (8). The microcapsules (5) whose optical reflection characteristics change due to the electric field change caused by the application of voltage are dispersed in the binder resin (11).

  The adhesive layer (16) is formed on a peelable resin substrate (20) in which a conductive layer (18) is formed between the silicon film as the peel layer (17) and the resin substrate as the peel base material (19). In addition, an adhesive may be applied in advance and applied as an adhesive sheet, or the adhesive may be directly applied to the microcapsule layer (10) of the color filter with microcapsules, and then the release substrate described above. The release layer surface of the peelable resin substrate (20) on which the conductive layer (18) and the release layer (17) are formed may be laminated on (19).

  Transparent substrates (1) include glass plates such as soda lime glass, low alkali borosilicate glass, non-alkali aluminoborosilicate glass, polyethylene terephthalate (PET), polycarbonate, polyimide, polyethylene naphthalate, polyethersulfone, acrylic resin A resin plate such as polyvinyl chloride is used.

  In the front plate of the present invention, the pattern shape of the two or more color filter layers (2) separated in a plane is not particularly limited, and the same shape is multifaceted, or the number of types of clothes is different. A suitable shape can be used as appropriate, for example, by arranging things. The individual shape of the color filter layer includes, for example, one in which fine band (striped) filter segments are arranged in parallel or intersecting, or one in which fine filter segments are arranged in a constant vertical and horizontal arrangement. The color filter layer (2) used in the present invention is provided with a plurality of colored patterns, and colored pixels are arranged in each of the pixel regions. The colored pixels are used to color the transmitted light for each pixel, and are generally three colors of red (R), green (G), and blue (B) corresponding to the three primary colors of light, or yellow (Y) and magenta ( The colored pixels of the three primary colors M) and cyan (C) are arranged.

  A known manufacturing method can be adopted for manufacturing the color filter layer. In general, a colored photosensitive resin or a transparent photosensitive resin in which a coloring agent such as a pigment or a dye is dispersed and mixed in a photosensitive resin is applied on a glass substrate to a uniform thickness by a spin coating method or a spinless coating method. After the excess solvent is removed by drying, the resist film is irradiated with active energy rays using an ultra-high pressure mercury lamp in proximity exposure (proximity exposure) through a photomask of the desired shape by photolithography. It is carried out by repeating the necessary number of steps of curing (negative type) or increasing alkali solubility (positive type), developing by removing the portion dissolved with an alkaline solution and post-baking. In the present invention, the production method is not particularly limited.

  Then, the color filter layer (2) multifaceted on the glass substrate (1) is provided with a transparent electrode layer (4) after polishing and planarizing the surface as necessary. The transparent electrode layer is continuously formed on the color filter layer and the color filter layer. What can be used as the transparent electrode material is a conductive oxide having transparency such as indium oxide, tin oxide and zinc oxide such as ITO. A known technique such as a vapor deposition method, a sputtering method, or a CVD method can be used for forming the transparent electrode.

  The outline of the display principle of the color filter with microcapsules constituting the multicolor display panel using the multifaceted front plate of the present invention will be described below.

  As shown in FIG. 3, the pixel electrode (30) of the back substrate (50) is connected to the switching element (not shown) of each pixel electrode, and is positive or negative between the transparent electrode layer (4). Can be applied. In order to display an image, the pixel electrode (30) is usually connected to a power source having a circuit configuration of an active matrix drive system. When a voltage is applied to the pixel electrode (30), the electric field applied to the microcapsule layer (10) with a color filter varies. When the pixel electrode (30) is positive, the negatively charged particles in the microcapsule (5) move to the back pixel electrode (30) side, and the positively charged particles are It moves to the transparent electrode layer (4) side. Similarly, when the pixel electrode (30) becomes a negative electrode, the positively charged particles move to the pixel electrode side, and the negatively charged particles move to the transparent electrode layer (4) side. Here, for example, if the black particles are positively charged and the white particles are negatively charged, the display color becomes the color of the particles moved to the transparent electrode layer (4) side of the front surface. The desired character or image can be displayed in color by passing the colored pattern of the color filter layer where the reflected light is reflected and the reflected light is opposed.

  Next, materials and members used for the front plate of the present invention will be further described.

  The microcapsule (5) used for forming the color filter with microcapsules of the front plate of the present invention comprises colored particles (6), white particles (7), a transparent dispersion medium (8), and a microcapsule shell (9). .

  In general, the microcapsules used in the microcapsule type electrophoretic display panel are refined by a sieving method or a specific gravity separation method, and have an average particle size of 30 to 100 μm. On the other hand, the proportion of microcapsules having a particle size within 10 μm before and after exceeds at least 50%. The same applies to the microcapsules used in the front plate of the present invention.

  For the microcapsule dispersion, an aqueous solvent such as alcohol is used, and water is used if there is no particular problem.

As the transparent dispersion medium (8), for example, aliphatic hydrocarbons, aromatic hydrocarbons, alicyclic hydrocarbons, halogenated hydrocarbons, various esters, alcohol solvents, or other fats are used alone or appropriately mixed. Use the solvent.

  For the colored particles (6), in addition to inorganic pigments such as inorganic carbon, fine powders such as glass or resin, and composites thereof are used. In the multicolor display panel according to the present invention that performs multicolor display using a color filter, normally, black particles using carbon black are used.

  As the white particles (7), known white inorganic pigments such as titanium oxide, silica, alumina and zinc oxide, organic compounds such as vinyl acetate emulsion, and composites thereof are used.

  The colored particles (6) and the white particles (7) may have a desired surface charge by treating the surface of the particles with various surfactants, dispersants, organic and inorganic compounds, metals, etc. as necessary. Not only can be imparted, but also the dispersion stability in the transparent dispersion medium (8) can be improved.

  Dispersion A in which colored particles (6) and white particles (7) are dispersed in a transparent dispersion medium (8) is a phase separation method such as a mixed coacervation method, an interfacial polymerization method, an in-situ method, and a solution dispersion cooling method. Etc., and encapsulating in microcapsules using a known method. The shell (9) of the microcapsule is, for example, a rubber or gelatin film.

  A microcapsule dispersion is prepared by mixing a thickener, a surfactant, a binder resin (11), and the like with a microcapsule dispersion in which microcapsules having different particle size distributions are dispersed. For the binder resin (11) of the microcapsule ink, a dielectric resin such as polylactic acid, phenol resin, polypropylene resin, acrylic resin, or urethane resin is used. When two or more kinds of microcapsule inks are mixed and then mixed, in order to prevent a change in ink density after mixing, the density of the inks to be mixed is adjusted to be equal.

  As described above, the microcapsule layer (10) has the transparent electrode layer (4) continuously formed on the two or more color filter layers (2) and the color filter layers in advance as described above. It is formed by directly coating on the transparent electrode layer (4) of the transparent substrate (1) made of a provided glass substrate or resin substrate. The coating is performed using 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.

  Since the surface of the microcapsule layer (10) formed as described above is uneven, the distance between the electrodes sandwiching the microcapsule is difficult to be constant. Therefore, if necessary, it is preferable to form a surface smoothing layer by applying a surface smoothing ink on the microcapsule layer (10). By forming the surface smooth layer, the adhesive can be directly applied onto the surface smooth layer. This is because when the adhesive is directly applied without a surface smoothing layer, if there are uncoated portions such as pinholes in the microcapsule layer (10), the adhesive directly touches the transparent electrode layer (4) on the color filter side, It can be avoided that the dielectric constant changes and it becomes difficult to apply a voltage to the microcapsule, resulting in an unclear display.

The surface smoothing ink is obtained by dispersing a resin in a solvent as a binder. As the binder component, a resin having the same dielectric constant as that of the binder resin component used in the microcapsule ink or the binder component used in the adhesive layer is preferable. Especially, it is the most preferable that it is the same as the binder resin component used for the microcapsule ink and the adhesive layer, and the binder resin component of the surface smoothing ink is also the same. When resins having different dielectric constants are used, resins having different dielectric constants are laminated between the electrodes, and the thickness of each resin varies depending on the size of the microcapsule in the portion. This is because the voltage applied to the microcapsules is difficult to be uniform over the entire screen due to the difference in dielectric constant of each resin.

  As the solvent for the surface smoothing ink, those used for the microcapsule ink can be used, but other aqueous solvents such as alcohols may be used. The surface smoothing ink is applied using a coating apparatus such as a curtain coater or a slot die coater. The coating method of scraping off the coating liquid such as blade coating cannot be used because it bursts the microcapsules in the microcapsule layer.

  The thickness of the surface smoothing layer is preferably 10 to 30 μm. When the thickness is 10 μm or less, the unevenness of the microcapsule surface is not smooth. On the other hand, if it is 30 μm or more, the distance between the electrodes increases, which causes the drive voltage to increase.

  As described above, a color filter with a microcapsule with or without a surface smoothing layer is formed. By laminating a release resin substrate on which a conductive layer and a release layer are formed on a release substrate via an adhesive layer on the microcapsule layer side of the color filter with microcapsules, as shown in FIG. In this embodiment, the front plate, that is, the multi-faceted color filter electrophoresis front plate (A) is obtained.

  The adhesive layer may be applied as an adhesive sheet by previously applying an adhesive onto a peelable resin substrate in which a conductive layer is formed between a silicon film as a release layer and a resin substrate as a release substrate. Then, an adhesive is directly applied to the microcapsule layer of the color filter with microcapsules, and then the release layer surface of the release resin substrate on which the conductive layer and the release layer are formed is laminated on the release substrate. May be.

  By the way, the microcapsule layer applied on the transparent electrode layer of the transparent substrate having the multi-faced color filter layer described above may be originally formed on the transparent electrode layer on the color filter layer piece. For this reason, it is preferable to laminate a cover film in a place where the microcapsule ink is unnecessary before application. The cover film is laminated on the entire surface, and the cover film on the color filter layer is removed using Thomson cutting or laser. Further, before the lamination, a hole corresponding to the shape of the color filter layer may be formed in the cover film in advance, and then laminated. Moreover, you may form a resist resin in a microcapsule ink unnecessary part using photolithography instead of a cover film.

  After the cover film is formed, the microcapsule ink is applied to the entire surface, and the surface smoothing ink described above is further applied and dried. Thereafter, by removing the cover film, the microcapsule layer can be formed only at a necessary position on the transparent electrode layer on the color filter layer.

  Next, a metal or resin mask having a window of the same size as the microcapsule layer and having a thickness 2 to 6 times the thickness of the microcapsule layer is placed on the transparent electrode between the color filter layers, and an adhesive is applied. dry. The surface of the mask is preferably subjected to a release treatment for an adhesive such as silicon resin or fluorine resin. Since the adhesive layer is drawn when the mask is removed as it is, half cut is applied to the adhesive layer at the boundary portion of the mask with Thomson or laser as necessary.

Subsequently, by removing the mask, an adhesive layer is formed only on the portion of the microcapsule layer laminated on the transparent electrode layer on each of the multi-faceted color filter layers, with a microcapsule with a multifaceted adhesive layer By forming a color filter and laminating a peelable resin substrate having a conductive layer and a peelable layer formed on a peelable base material on this adhesive layer, another example of one embodiment of the present invention shown in FIG. A front plate, that is, a multifaceted color filter electrophoresis front plate (B) is obtained.

  What can be used as the adhesive is preferably a synthetic resin adhesive such as a urethane resin adhesive or an acrylic resin adhesive. In particular, an adhesive using a high dielectric resin is preferable, and an adhesive using the same components as the binder resin used in the above-described microcapsule ink is preferably applied. By using an adhesive with the same components as the binder resin used in the microcapsule ink, the affinity at the interface of the resin is increased, peeling does not occur easily, and the dielectric constant is similar, so it is applied to the microcapsule. An advantage is that the applied voltage tends to be constant in terms of surface.

  Further, by using a resin release substrate in which a conductive layer is formed between a silicon film and a resin substrate, a multilayer substrate in which the above-described adhesive and resin release substrate are laminated on a color filter with microcapsules, a so-called front plate of the present invention ( Drive evaluation and quality confirmation can be performed with a multi-faceted color filter electrophoresis type front plate). Note that the conductive layer here does not require transparency, and may be a thin film formed by vapor deposition and electrodeposition of a metal such as copper or aluminum, or a film formed by applying a conductive polymer.

  The front plate of the present invention is separated into pieces by dicing, the above-described resin release substrate is peeled and removed, and the remaining adhesive layer is used to match with the positioning mark of the color pattern (pixel) of the color filter. A multicolor display panel according to the present invention is formed by laminating and laminating a pixel electrode surface of a back electrode plate having a pixel electrode made of ITO having a circuit configuration of an active matrix type driving method using a thin film transistor on a glass substrate as Is obtained. Thus, when driven, each multicolor display panel has no difference in display performance, has a high display brightness, and can efficiently produce a multicolor display panel having no hue parallax depending on the viewing angle.

  Specific examples of the present invention will be described below.

<Example 1>
Disperse titanium oxide powder (white particles) with an average particle diameter of 3 μm coated with a polyethylene resin and carbon black powder (black particles) with an average particle diameter of 4 μm surface-treated with alkyltrimethylammonium chloride in tetrachloroethylene as a transparent dispersion medium. Dispersion A was obtained. In this case, the white particles are negatively charged and the black particles are positively charged.

  Next, an aqueous solution in which gelatin and sodium polystyrene sulfonate are dissolved in water is prepared, mixed with dispersion A, adjusted to a liquid temperature of 40 ° C., and stirred with a homogenizer while maintaining the liquid temperature. An emulsion was obtained.

  Next, the obtained O / W emulsion and an aqueous solution in which gum arabic was dissolved in water were mixed using a dispenser at 40 ° C., and the pH of the solution was adjusted using acetic acid while maintaining the liquid temperature at 40 ° C. Was adjusted to 4, and microcapsules having gelatin-gum arabic as a shell material were formed by a complex coacervation method.

  Further, after the liquid temperature was lowered to 5 ° C., a 37 mass% formalin solution was added to harden the wall material of the microcapsule shell, and dispersion in which white particles (titanium oxide particles) and black particles (carbon black particles) were dispersed A microcapsule enclosing the liquid A was obtained.

The microcapsules thus obtained were sieved, and the particle diameters were adjusted so that the average particle diameter was 60 μm and the ratio of microcapsules having 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 using the microcapsules as a solid content. The aqueous dispersion, a urethane binder having a solid content of 25% by mass (CP-7050, manufactured by DIC Corporation), a surfactant, a thickener, and pure water were mixed to prepare a microcapsule ink.

  On the other hand, on a transparent glass substrate having dimensions of 300 mm × 350 mm and a thickness of 0.7 mm, a color filter having a size corresponding to a 6-inch screen size was prepared by four-sided imposition. Each screen was created in a form separated by 20 mm. In the following color filter creation, all parts are parts by mass.

  First, 50 parts of butyl methacrylate, 20 parts of methyl methacrylate and 30 parts of acrylic acid were copolymerized using cyclohexanone as a solvent to prepare an acrylic resin.

  An acrylic resin solution was prepared so that the solvent was in a ratio of 47 parts with respect to 25 parts of this acrylic resin, and 20 parts of a red pigment (Pigment Red 22) was added thereto and dispersed in a bead mill for 1 hour. Thereafter, further 4 parts of dipentaerythritol and 4 parts of hexaacrylate as photosensitive monomers and 0.3 part of bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide as a photopolymerization initiator were mixed in a disper. A red photoresist material was prepared.

  This red photoresist material was spin-coated on a transparent glass substrate, allowed to stand at room temperature for 5 minutes to smooth the film surface, and then dried at 70 ° C. for 20 minutes to form a red photoresist layer.

In this red photoresist layer, each screen is separated at an interval of 20 mm, and each screen is repeatedly formed with an exposure portion stripe pattern of 102.8 mm in length × 110 μm in width through a light shielding portion of 280 μm in the horizontal direction. A four-sided photomask was brought into close contact, and contact exposure was performed with an ultrahigh pressure mercury lamp under an exposure amount of 150 mJ / cm ² .

After the exposure, spray development was performed for 20 seconds by spraying a 1% aqueous sodium carbonate solution at a temperature of 20 ° C. at an ejection pressure of 1 Kg / cm ² to remove the unexposed area and expose the glass substrate.

  After drying the glass substrate after the development treatment, the film was hardened by heating at 230 ° C. for 1 hour to obtain a red pattern having a thickness of 1.1 μm.

  Next, on the glass substrate on which the red pattern is formed, a green pigment (Pigment Green 7) is used as a coloring material, and a green photoresist material prepared with the same composition as the above-described red photoresist is used. A layer was formed.

A photomask similar to the above was placed at a position moved 130 μm in the horizontal axis direction from the position where the red pattern was formed, and contact exposure was performed under the condition of an exposure amount of 200 mJ / cm ² .

After the exposure, spray development in which a 1% sodium carbonate aqueous solution at a temperature of 20 ° C. was sprayed at an ejection pressure of 1 Kg / cm ² was performed for 30 seconds to remove unexposed portions and expose the glass substrate.

  After the glass substrate after the development treatment was dried, a hardening treatment was performed by heating at 230 ° C. for 1 hour in the same manner as described above to obtain a green pattern having a thickness of 1.2 μm.

  Further, in the same manner as described above, a blue photoresist material was prepared using a blue pigment (Pigment Blue 15: 6) as a color material, and a blue pattern having a thickness of 1.1 μm was obtained.

  Thus, the board | substrate with which the color filter layer corresponding to the screen size 6 type | mold which has a coloring pattern of 3 colors was formed on the glass substrate at the space | interval of 20 mm was obtained. Next, a transparent electrode layer made of ITO was formed on the entire surface of the color filter layer and the exposed glass substrate by a sputtering method.

  Next, the above-described microcapsule ink is applied onto the transparent electrode layer of the substrate having the color filter layer and the transparent electrode layer on the above-described transparent glass substrate using a slot die coater. It dried and obtained the color filter with a microcapsule.

  Furthermore, a urethane binder (CP-7050, manufactured by DIC Corporation) having a solid content of 25 mass% is overlaid as a surface smoothing ink on the microcapsule layer of the color filter with microcapsules using a slot die coater. And dried to obtain a microcapsule type electrophoretic layer with a color filter with a surface smoothing layer.

  Separately, a peelable resin substrate made of a polyethylene terephthalate sheet having a thickness of 50 μm was prepared by depositing aluminum with a thickness of 100 nm on one side as a conductive layer and further having a silicon-based release coat layer thereon. A 25 μm thick polyester-urethane adhesive was applied to the release coating surface side of this release resin substrate to prepare an adhesive sheet.

  Next, the adhesive sheet was bonded to the color filter with microcapsules with the surface smoothing layer to obtain the four-sided front plate of Example 1. At this stage, when a voltage was applied between the transparent electrode layer and the conductive layer, the black particles and white particles in any of the microcapsules in the four screens were applied between the two electrodes according to the direction of the electric field at the applied voltage. It was possible to confirm that they moved alternately, and quality confirmation was possible.

<Example 2>
Until the formation of the transparent electrode layer, in the same manner as in Example 1 described above, four color filter layers corresponding to the screen size 6 type having three colored patterns are formed on the glass substrate at intervals of 20 mm. A finished substrate was obtained.

  Next, a cover film made of a polyethylene resin film having a thickness corresponding to the shape of the color filter layer and having a thickness of 50 μm is adhered and laminated to the glass substrate. After the cover film is formed, the microcapsule ink is applied to the entire surface in the same manner as in Example 1, and then the surface smoothing ink is applied and dried as in Example 1. Thereafter, the cover film was removed, and a microcapsule layer was formed only on the transparent electrode layer on the color filter layer.

  Next, a stainless steel mask having a window of the same size as the microcapsule layer as in the case of the cover film and having a surface of 300 μm in thickness released from silicon resin is covered on the exposed transparent electrode, A polyester-urethane adhesive similar to that used in Example 1 was applied to the entire surface by a curtain coating method with a thickness of 25 μm. After drying, this mask is removed, and an adhesive layer is formed only on the part of the microcapsule layer laminated on the transparent electrode layer on each of the multi-faceted color filter layers. A four-sided front plate of Example 2 was obtained by laminating a peelable resin substrate having a conductive layer and a release layer formed on a release substrate on the entire surface including the adhesive layer. Obtained. In the same manner as in Example 1, when a voltage was applied between the transparent electrode layer and the conductive layer at this stage, the black particles and white particles in any of the microcapsules in the four screens were subjected to the electric field at the applied voltage. According to the direction, it was confirmed that the electrodes moved alternately between the two electrodes, and the quality could be confirmed.

  Further, the front plates of Examples 1 and 2 were separated by dicing, the 50 μm-thick polyethylene terephthalate sheet provided with the silicon-based release coat was peeled off, and the remaining polyester-urethane adhesive was passed through the adhesive layer. A thin film transistor is formed on a 134.4 mm × 102.8 mm glass substrate as a TFT substrate having an area of a display portion of 122.4 mm × 90.6 mm in combination with positioning marks of colored patterns (pixels) of the respective color filters. A multi-color display panel was obtained by laminating and laminating the pixel electrode surfaces of a back electrode plate having pixel electrodes made of ITO having a circuit configuration of an active matrix type drive system using the above.

A voltage of about 15 V is applied between the front transparent electrode and the back pixel electrode from the standard voltage / current generator (Yokogawa Electric Corporation) to the display panels of Examples 1 and 2 thus fabricated. The display characteristics were evaluated. Also, using a color difference meter CR-400 (manufactured by Konica Minolta), the reflectance during color display (white display) and black display is measured, and contrast = color (white) reflectance / black Contrast was evaluated as reflectance. Furthermore, the visual brightness L ^* was measured with the same apparatus.

  As a result, when the multicolor display panel using the front plate of Examples 1 and 2 was driven, there was no difference in display performance between the individual multicolor display panels, the display brightness was high, and the color parallax depending on the viewing angle There was not.

DESCRIPTION OF SYMBOLS 1 ... Transparent substrate 2 ... Color filter layer 4 ... Transparent electrode layer
5 ... Microcapsules 6 ... Colored particles 7 ... White particles
DESCRIPTION OF SYMBOLS 8 ... Transparent dispersion medium 9 ... Microcapsule shell 10 ... Microcapsule layer 11 ... Binder resin 16 ... Adhesive layer 17 ... Release layer 18 ... Conductive layer 19 ... Peeling substrate 20 ... Peelable resin substrate 30 ... Pixel electrode
50 ... Back base material

Claims (4)

Two or more color filter layers separated in a plane are formed on a transparent substrate, and have a continuous transparent electrode layer on the color filter layer and the color filter layer, and at least on the color filter layer A microcapsule layer is directly laminated on the transparent electrode layer of
The microcapsule layer is configured by dispersing microcapsules in a binder resin, and the microcapsules encapsulate a dispersion liquid in which electrophoretic particles are dispersed in a transparent dispersion medium. The optical reflection characteristics change,
Furthermore, a multi-sided color filter electrophoresis method front plate in which a peelable resin substrate having a conductive layer formed thereon is laminated on the microcapsule layer via an adhesive layer,
The conductive layer is formed by being continuously connected to a position that is paired with the transparent electrode layer on the color filter layer and a position that is paired with the transparent electrode layer on the color filter layer. Attached color filter electrophoresis front plate.   2. The multifaceted color filter electrophoresis front plate according to claim 1, wherein the electrophoretic particles are particles having two different surface charges, one of which is a colored particle and the other is a white particle. . (A) a step of providing two or more color filter layers separated in a plane on a transparent substrate; (b) a step of providing a continuous transparent electrode layer on the color filter layer and on the color filter layer;
(C) Microcapsules whose optical reflection characteristics change due to an electric field change by applying a voltage in which a dispersion liquid in which electrophoretic particles are dispersed in a transparent dispersion medium is sealed on at least the transparent electrode layer on the color filter layer Forming a microcapsule layer in which a binder resin is dispersed;
(D) Continuously connected to the microcapsule layer through an adhesive layer at a position paired with the transparent electrode layer on the color filter layer and a position paired with the transparent electrode layer on the color filter layer. Laminating a peelable resin substrate on which a conductive layer is formed,
A method for producing a multi-faceted color filter electrophoresis front plate.   Applying a voltage between the transparent electrode layer and the conductive layer of the multi-faceted color filter electrophoresis front plate according to claim 1 or 2, and collectively evaluating driving of the microcapsule layer in advance. Separating the multi-faceted color filter electrophoresis front plate, separating and removing the peelable resin substrate on which the conductive layer is formed from the adhesive layer, and via the adhesive layer A method for producing a multicolor display panel, comprising the step of bonding a pixel electrode surface of a back electrode plate having a pixel electrode on a back substrate and the microcapsule layer.

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