JP5028970B2 - Multicolor display panel manufacturing method and multicolor display panel image display method - Google Patents

Description

  The present invention relates to a method for manufacturing a multicolor display panel and an image display method for a multicolor display panel to which two or more types of display bodies using different electrophoretic particles that move by application of an electric field are applied.

  With the development of information equipment, information display is also taking various forms. As a display of variable information, a liquid crystal display or the like is currently mainstream.

  Light-emitting displays such as liquid crystal displays that use backlights are unsuitable for reading texts because they are tired of the eyes they see over long periods of use. On the other hand, liquid crystal displays of a type that does not use a backlight have problems such as poor visibility due to noticeable darkness of the screen due to the use of polarizing plates.

  As a technique for solving these problems, a display principle different from that of a liquid crystal display, that is, a method of displaying by moving colored charged particles is proposed.

  When multicolor display is performed by the electrophoresis method using the microcapsules, it is necessary to match the position where the electric field is applied for each color, and it is necessary to align them sequentially.

  That is, as shown in FIG. 5, the position of the microcapsule (111) in which the particles of the first color (C) are encapsulated and the position of the electrode (33C) for applying an electric field to this correspond to a pair. Must be. Similarly, the position of the microcapsule (112) in which the particles of the second color (M) are encapsulated, the position of the electrode (33M) for applying an electric field thereto, and the particles of the third color (Y) are encapsulated. The position of the microcapsule (113) and the position of the electrode (33Y) for applying an electric field to the microcapsule (113) must be paired with each other. Further, the position of the microcapsule (114) in which the particles of the fourth color (K) are encapsulated and the position of the electrode (33K) for applying an electric field to this must be paired with each other. They must be arranged in a regular order such as Y, M, C, K.

The microcapsules encapsulating the electrophoretic particles are, for example, as shown in FIG. 6, an acrylic resin such as polymethyl methacrylate and polyethyl methacrylate, urea resin, gelatin, gum arabic and the like as a capsule shell (14), Titanium oxide, which is white particles (12) coated with a polyethylene resin that is negatively charged in the dispersion medium, and tetramethylammonium that is positively charged in the dispersion medium. Colored particles of Y, M, C, K color coated with quaternary ammonium of alkyltrimethylammonium chloride {R (CH ₃ ) ₃ N ⁺ Cl ⁻ , R is an alkyl group} such as chloride and ethyltrimethylammonium chloride (13 ) Is enclosed.

The patent literature is as follows.
JP 2000-35598 A

  The problem to be solved by the present invention is that, in the electrophoretic multicolor display panel using the above microcapsules, the microcapsules of two or more colors are simply applied separately according to the position of each color electrode. To provide a display panel capable of displaying and a manufacturing method.

  For example, in Patent Document 1, microcapsules are ejected from a nozzle one by one by an ink jet method. According to this method, it is described that the microcapsules can be accurately and uniformly arranged on the electrode by controlling the timing of the microcapsule ejection and the moving speed of the nozzle.

  In such a case, there is a problem in that the microcapsules supplied and arranged by the ink jet apparatus have many gaps, and a dense microcapsule cannot be formed.

  An object of the present invention is to provide a multicolor display panel capable of realizing multicolor display by embodying different color microcapsules by using a technology capable of forming microcapsules densely with a coater head.

(Invention of Claim 1)
The present invention has been made to achieve such problems.

The invention of claim 1 is a method for manufacturing a multicolor display panel in which a plurality of microcapsules of different colors including two or more kinds of particles having different optical reflection characteristics that are moved by application of an electric field are arranged in parallel, and insulate in order The process of forming a conductive film on a substrate, the process of forming a protective film, the process of slitting the protective film at the boundary between different colors, the process of peeling the protective film for each color and the surface of the conductive film from which the protective film has been peeled off after microcapsules of each color were repeated step of coating with a lip coater only the color number, and this includes the step of laminating a conductive film, by said, microcapsules densely and two or more colors It arrange | positions in a designated position and eliminates the said subject.

(Invention of Claim 2)
The present invention has been made to achieve such problems.

  According to a second aspect of the present invention, the step of applying the microcapsules is performed by a lip coater, thereby solving the above-mentioned problem due to the ink jet system.

(Invention of Claim 3)
The invention of claim 3 is an image display method of a multicolor display panel formed by the manufacturing method according to claim 1, and is arranged for each of the microcapsules of different colors arranged. By displaying an image by applying an electric field from the electrode array, the microcapsules are densely arranged at two or more colors at designated positions, thus solving the above-mentioned problem.

(Effect of the invention of claim 1)
According to the invention of claim 1, a multicolor display panel capable of multicolor display is provided by using a lip coater capable of densely coating microcapsules and separately coating multicolor display color microcapsules at designated positions. Can

  Further, since the simple manufacturing process is repeated, the manufacturing becomes easy and the yield is improved, so that the manufacturing cost can be reduced as a result.

(Effect of the invention of claim 2)
According to the second aspect of the present invention, there is no gap between the microcapsules supplied and arranged by the ink jet device, and a dense microcapsule can be formed.

(Effect of the invention of claim 3)
According to a third aspect of the present invention, an image can be displayed by applying an electric field from the arranged electrode array to each of the formed microcapsules arranged in a multicolored color. Can be provided.

  Further, since the simple manufacturing process is repeated, the manufacturing becomes easy, and an image display with good performance becomes possible.

  Next, the present invention will be described in detail based on the illustrated embodiment.

(Creation of color specification microcapsules)
In the present invention, first, titanium oxide having an average particle size of 3 μm and surface-coated with a polyethylene resin that is negatively charged in a solution in a tetrachloroethylene solvent and an alkyltrimethylammonium chloride (R (CH ₃ ) ₃ N that is positively charged in the solution. ⁺ Cl ⁻ , R is an alkyl group) surface-treated with an average particle size of 3.5 μm yellow colored particles (Pigment Yellow 13) (13Y) magenta colored particles (Pigment Red 122), (13M), cyan colored particles (Pigment Blue) (13C ), And four types of dispersion liquids in which each colored pigment of black pigment particles (Pigment Black) (13Bk) is dispersed.

  Each dispersion was mixed with water adjusted to 40 ° C. and an aqueous solution containing gelatin and sodium dodecyl sulfate as an emulsifying agent, and stirred with a homogenizer while maintaining the liquid temperature at 40 ° C. to obtain an O / W emulsion. It was.

  Next, each O / W emulsion obtained and an aqueous solution in which gum arabic was mixed with water adjusted to 40 ° C. were mixed using a disper, and acetic acid was used while keeping the liquid temperature of each solution at 40 ° C. The pH of the solution was adjusted and a microcapsule shell (14) was formed by coacervation. Furthermore, each liquid temperature was adjusted to 5 ° C., a formalin solution was added, and the pH of the solution was adjusted using sodium hydroxide. And each liquid temperature was adjusted to 50 degreeC, stirring, the microcapsule shell was hardened, and the diameter of the microcapsule which enclosed the dispersion liquid in which the white and each color particle were disperse | distributed was screened, respectively, and it adjusted to about 40 micrometers.

(Preparation of microcapsule coating solution)
The obtained four types of microcapsules and a polyurethane resin solution (Nipporan 5037, manufactured by Nippon Polyurethane Industry Co., Ltd.) were mixed to prepare a microcapsule coating solution (see FIG. 1).

(Create display panel)
2 and 3 show an example of the formation process of the present invention. The basic formation process of the present invention according to the embodiment shown in FIGS. 2 and 3 is shown in FIGS.

  A 40 μm protective film having the same thickness as the microcapsule is bonded onto a transparent material provided with an indium oxide (hereinafter abbreviated as ITO) electrode on the entire surface (FIG. 2A). Using the blade (Flexible Pinnacle Die, Tsukaya Cutlery Seisakusho) formed with high precision, leaving the base film at an interval of 50μm, for example, the laminated protective film is pressed and slit as much as possible. (FIG. 2 (b)). This slit constitutes a boundary between colors.

  First, the protective film of the color portion to which the first color microcapsule is applied is peeled off (FIG. 2C). A microcapsule of the first color is applied to the peeled portion of the protective film with a linear lip coater (FIG. 2 (d)). This completes the first color process.

  Similarly, the protective film of the color part which coats the microcapsule of the second color is peeled off (FIG. 2E). The microcapsules of the second color are applied to the peeled portion of the protective film with a linear lip coater (FIG. 2 (f)).

  Further, the protective film of the color portion to which the third color microcapsule is applied is peeled off (FIG. 3G). A third color microcapsule is applied to the peeled portion of the protective film with a linear lip coater (FIG. 3 (h)). The protective film of the color part to which the fourth color microcapsule is applied is peeled off (FIG. 3 (i)). A microcapsule of the fourth color is applied to the peeled portion of the protective film with a linear lip coater (FIG. 3 (j)). Finally, a conductive film (for example, a conductive polymer film) is laminated to obtain a multicolor display panel.

(Multicolor display panel)
Then, as shown in FIG. 4, a writing device comprising an electrode array head 6 having an electrode array in which electrodes are arranged at a pitch for each color (for example, 50 μm) on the multicolor display panel 5 obtained as described above and a computer 7 is provided for each color. When a voltage of ± 15 V was applied from the electrodes while being moved parallel to the coating direction and moved in parallel, for example, every 100 μm, the contents to be displayed on the multicolor display panel 5 could be expressed.

It is explanatory drawing which shows the preparation of the microcapsule coating liquid which concerns on this invention. It is a conceptual sectional view showing a part of formation process concerning the present invention. FIG. 3 is a conceptual cross-sectional view showing a step that follows the formation step of FIG. 2 according to the present invention. It is a conceptual perspective view which shows the writing state to the obtained multicolor display panel based on this invention. It is a schematic cross section of the conventional multicolor display panel. It is a schematic cross section of the microcapsule which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Transparent base material 2 ... Protective film 3C ... Cyan line coat head 3M ... Magenta line coat head 3Y ... Yellow line coat head 3K ... Black line coat head 4 ... Conductive film 5 ... Multicolor display panel 6 ... Electrode array head 7 ... Computer 12 ... White particles 13C ... Cyan colored particles 13M ... Magenta colored particles 13Y ... Yellow colored particles 13K ... Black colored particles 20 ... Binder solvent 33C ... Cyan electrode 33M ... Magenta electrode 33Y ... Yellow electrode 33K ... Black electrode 111 ... Cyan display microcapsule 112 ... Magenta display microcapsule 113 ... Yellow display microcapsule 114 ... Black display microcapsule

Claims (3)

A method for producing a multicolor display panel, comprising two or more kinds of particles having different optical reflection characteristics that are moved by application of an electric field, wherein microcapsules of a plurality of colors are arranged in parallel.
The process of forming a conductive film on an insulating substrate in sequence, the process of forming a protective film, the process of slitting the protective film at the boundary between different colors, the process of peeling the protective film for each color and the conductivity from which the protective film has been peeled after repeating the step of coating the microcapsules of each color on the membrane surface with a lip coater only the color number, and this includes the step of laminating the conductive film,
A manufacturing method of a multicolor display panel characterized by the above.   2. The method for producing a multicolor display panel according to claim 1, wherein the step of applying the microcapsules is performed by a lip coater. An image display method for a multicolor display panel formed by the manufacturing method according to claim 1, wherein an electric field is applied from an electrode array arranged for each of the microcapsules of different colors arranged. An image display method for a multicolor display panel, characterized in that image display is performed.