JP2009122192A - Method of manufacturing panel for information display, and panel for information display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a panel for information display provided with a substrate with a projected electrode of a cell center part capable of partly shortening a distance between the electrodes in a simple method, and to provide the panel for information display. <P>SOLUTION: The method of manufacturing the panel for the information display seals a display medium configured as a particle group containing electrification particles between two substrates at least one of which is transparent, and displays information such as images by giving an electric field to the display medium and moving the display medium. When at least the substrate of a rear face is manufactured, positions corresponding to each cell center part are embossed to be molded in projections so that the cell center part obtains the substrate with the projected electrode after the electrodes are formed by a conductive material having rolling property on a sheet capable of being embossed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention encloses a display medium configured as a particle group including a chargeable particle between two substrates, at least one of which is transparent, and applies an electric field to the display medium, thereby moving the display medium to generate an image or the like. The present invention relates to a method for manufacturing an information display panel for displaying the above information and an information display panel.

  Conventionally, in a driving type information display panel using charged particles as a display medium, a display medium made of charged particles is sealed in each cell formed by partitioning a space between substrates with a partition, and formed by electrodes provided on the substrate. A voltage is applied to the counter electrode to form an electric field between the electrodes, and the display medium is driven by the electric field. However, since the distance between the electrodes is the same, the strength of the formed electric field is the same. ) Had to be applied. As the information display panel of the charged particle driving method, a display medium is sealed in a cell space in gas (for example, a powder fluid driving method) and a microcapsule (a type of cell) is sealed with an insulating liquid. What is stopped (electrophoresis) is well known.

  As a method for avoiding a large driving voltage, the inter-substrate space is formed by partitioning in order to make the distance between the electrodes different in the cell in order to have a distribution in the magnitude of the electric field formed in the cell. It is known that in each cell, a part of the partition wall is arranged along the cell inner direction to form a portion that reduces the inter-substrate distance in the cell, and then an electrode is formed on the substrate to form a substrate with an electrode (for example, , See Patent Document 1).

JP 2006-58475 A JP 2003-186425 A

  In the technique described in Patent Document 1 described above, the distance between the electrodes is partially shortened by bending a predetermined portion of the back substrate with electrodes instead of being planar. However, there is a problem that it is difficult to form the electrode in such a shape after the partition is formed.

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and to provide a method for manufacturing an information display panel comprising a cell-centered electrode-attached substrate capable of partially shortening the distance between electrodes by a simple method, and An information display panel is to be provided.

  The method for producing an information display panel of the present invention includes enclosing a display medium configured as a particle group including a chargeable particle between two substrates, at least one of which is transparent, and applying an electric field to the display medium. In the method of manufacturing an information display panel that displays information such as images by moving a display medium, an electrode is formed of a rollable conductive material on a sheet that can be embossed at least for producing a substrate on the back side. After the formation, a position corresponding to each cell central portion is embossed and formed into a convex shape, and a substrate with an electrode having a convex cell central portion is obtained.

  As a suitable example of the manufacturing method of the information display panel of the present invention, the substrate with electrodes is a substrate with line electrodes, or a substrate in which individual electrodes are arranged in a dot shape or a segment shape. The electrode material used may be a metal.

  The information display panel according to the present invention is characterized in that it is produced according to the above-described method for manufacturing an information display panel, and includes at least a substrate with electrodes having a convex central portion of the cell as a substrate on the back side. .

  According to the present invention, when forming an electrode-attached substrate of an information display panel, an embossed sheet is formed with a rollable conductive material on an embossable sheet, and then the position corresponding to each cell center is embossed. With a convex electrode in the center of the cell, the distance between the electrodes can be partially shortened by a simple method by processing into a convex shape and obtaining a substrate with a convex electrode in the center of the cell An information display panel manufacturing method and an information display panel including a substrate at least on the back side can be obtained.

  First, a basic configuration of an information display panel that is a manufacturing target of the manufacturing method of the present invention will be described. In the information display panel which is an object of the present invention, an electric field is applied to a display medium configured as a particle group including a chargeable particle sealed between two opposing substrates. Along with the applied electric field direction, the display medium is attracted by an electric field force or a Coulomb force, and the display medium is moved by a change in the electric field direction, whereby information such as an image is displayed. Therefore, it is necessary to design the information display panel so that the display medium can move uniformly and maintain stability when rewriting the display repeatedly or when displaying the display information continuously. Here, as the force applied to the particles constituting the display medium, in addition to the force attracting each other by the Coulomb force between the particles, an electric mirror image force between the electrode and the substrate, an intermolecular force, a liquid cross-linking force, gravity and the like can be considered.

  An example of an information display panel that is an object of the present invention will be described with reference to FIGS. 1 (a) and (b) to FIGS. 2 (a) and 2 (b).

  In the example shown in FIGS. 1A and 1B, the optical reflectivity and charging characteristics of each other, which are configured as a particle group composed of at least one kind of particles including particles having optical reflectivity and chargeability. At least two types of display media 3 having different colors (here, a white display medium 3W composed of particles of white display medium particles 3Wa and a black display medium 3B composed of particles of black display medium particles 3Ba are shown) between substrates. An electric field generated by applying a voltage between an electrode 5 (individual electrode) provided on the substrate 1 and an electrode 6 (individual electrode) provided on the substrate 2 in each cell 7 formed by encapsulating and partitioning 4. Accordingly, the substrate is moved perpendicularly to the substrates 1 and 2. Then, as shown in FIG. 1A, the white display medium 3W is visually recognized by the observer and white dot display is performed, or as shown in FIG. 1B, the black display medium 3B is visually recognized by the observer. Black dots are displayed. In addition, in FIG. 1 (a), (b), the partition in front is abbreviate | omitted.

  In the example shown in FIGS. 2A and 2B, the optical reflectivity and the charging characteristics of each other are configured as a particle group composed of at least one kind of particles including particles having optical reflectivity and chargeability. Two or more types of display media 3 having different colors are enclosed between substrates (here, a white display medium 3W composed of particles of white display medium particles 3Wa and a black display medium 3B composed of particles of black display medium particles 3Ba are shown). In each cell 7 formed by the partition walls 4, an electric field generated by applying a voltage between the electrode 5 (line electrode) provided on the substrate 1 and the electrode 6 (line electrode) provided on the substrate 2 is generated. Accordingly, the substrate is moved perpendicularly to the substrates 1 and 2. Then, as shown in FIG. 2 (a), the white display medium 3W is visually recognized by the observer and white dot display is performed, or as shown in FIG. 2 (b), the black display medium 3B is visually recognized by the observer. Black dots are displayed. In addition, in FIG. 2 (a), (b), the partition in front is abbreviate | omitted.

  A feature of the method for manufacturing an information display panel according to the present invention is that, in the method for manufacturing an information display panel having the above-described configuration, a conductive material having a rollability is formed on a sheet that can be embossed when producing a substrate with electrodes. Then, after forming the electrode, the position corresponding to each cell central portion is embossed and formed into a convex shape to obtain a substrate with an electrode having a convex cell central portion.

  Hereinafter, the manufacturing method of the whole information display panel including the manufacturing process of the electrode-attached substrate in which the cell central part is convex, which is a feature of the manufacturing method of the present invention, will be described with reference to the drawings. Here, an example of an information display panel using a substrate with an electrode having a convex cell central part as a back side substrate is shown.

  FIGS. 3A to 3G are diagrams for explaining the overall flow of the method for manufacturing the information display panel of the present invention. First, as shown in FIG. 3A, predetermined partition walls 4 and electrodes 6 (line electrodes or individual electrodes: here, line electrodes) are formed on the transparent substrate 2 on the observation side. Next, as shown in FIG. 3B, the white display medium 3 </ b> W and the black display medium 3 </ b> B are filled into the cells 7 formed by the partition walls 4. On the other hand, as shown in FIG. 3 (c), an electrode 5 (line electrode or individual electrode: an electrode made of a metal material having excellent rollability is formed on a sheet 11 that can be embossed such as non-conductive (including insulating) resin. Here, a line electrode) is formed. Next, as shown in FIG. 3 (d), using the molding roller 12, the position corresponding to the center of each cell is embossed and formed into a convex shape, and the convex portion 13 and the flat portion 14 are formed. And the back substrate 1 with electrode having a convex cell center is obtained. Thereafter, as shown in FIG. 3 (e), the flat portion 14 of the substrate 1 having the convex portion 13 at the center of the cell and the top of the partition wall 4 formed on the substrate 2 on the observation side are bonded together. As shown in FIG. 3 (f), an information display panel using the embossed electrode-attached sheet as it is can be obtained. Moreover, as shown in FIG.3 (g), the sheet | seat with an embossed electrode can be bonded together to the board | substrate 15 with the adhesive agent 16, and the panel for information displays can also be obtained.

  FIG. 4 illustrates the embossing in FIG. In the example shown in FIG. 4, the substrate 2 on which the electrode 5 is formed has a predetermined convex portion 13 and a flat portion 14 by passing between the two molding rollers (15 and 12). The substrate 1 with an electrode having a convex cell central portion can be obtained. If a transparent sheet 11 is used as the sheet 11 that can be embossed such as non-conductive (including insulating) resin, and the transparent sheet is used as the conductive material having rollability, the resulting cell central portion is convex. These substrates with electrodes can also be used as the front substrate on the observation side.

  As described above, in the information display panel provided with the convex electrode-equipped substrate 1 at the center of the cell, which is obtained according to the production method of the present invention, a group of particles containing chargeable particles in the space between the two substrates with electrodes. Information display panel having a structure in which a display medium configured by sealing is sealed, and a portion having a small distance between the substrates is provided, and the display medium configured by particles including the chargeable particles can be driven at a low voltage Can be easily obtained.

  In an information display panel having a portion where the distance between the counter electrodes is small in the cell, the large electric field formed in the counter electrode portion having a narrow interval may cause the display medium in that portion to move (drive). Thus, all the display media in the cell including the display media in the counter electrode portion having a wide interval are moved, so that the display medium can be driven by applying a voltage lower than the drive voltage required when the interval is wide. Become.

  The electrode on the bottom surface of the convex portion at the center of the cell and the counter substrate side electrode are parallel to each other, but the electrode on the side surface of the convex portion at the center of the cell and the counter substrate side electrode are opposed at an angle. Therefore, the direction of the electric field formed is different. This is also considered to be one factor that enables the display medium to be driven by applying a low voltage. When the display medium (particles) on the side of the convex part moves slightly outward, the display on the bottom of the convex part is displayed. It is inferred that these display media are easily moved by hitting the media (particles).

  Next, each structural member of the information display panel which is the target of the manufacturing method of the present invention will be described.

  As the substrates 1 and 2, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyethylene (PE), polypropylene (PP), polycarbonate (PC), polyimide (PI), polyethersulfone (PES), acrylic, etc. A plastic substrate or glass substrate is used. Of these, a transparent substrate is used for the substrate 2 on the display surface (observation surface) side. The substrate 1 on the back side may not be transparent. If a material that can be embossed is used as the substrate material, the substrate itself can be embossed to produce a substrate with an electrode having a convex cell center.

  The convex portion 13 at the center of the cell is made of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyethylene (PE), polypropylene (PP), polycarbonate (PC), polyimide (PI), polyethersulfone (PES), It can be easily formed by preparing and embossing a plastic sheet 11 such as acrylic separately from the substrate. In this case, the convex portion 13 is formed by embossing or the like on the plastic sheet 11 by a photolithography method, a printing method, a sputtering method, a vacuum deposition method, a CVD (chemical vapor deposition) method, a coating method or a metal foil (for example, a rolled copper foil). This is performed on the electrode-attached sheet on which the electrode 5 has been formed by using the method of laminating, and the embossed electrode-attached sheet can be attached to the substrate. As the plastic sheet 11 forming the central convex portion 13, an acrylic, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyethylene (PE), or polypropylene (PP) sheet having excellent rolling properties is particularly preferable.

  The plastic sheet 11 on which the electrode 5 and the central convex portion 13 are formed can be attached to another sheet to form the back substrate 1, or the plastic sheet 11 can be used as the back substrate 1 as it is.

  A cell center convex portion 13 is provided for each cell on the back substrate 1 side. Of the display medium enclosed in the cell, the display medium moved to the back side moves to the convex portion 13.

  The position where the cell center convex portion 13 is provided may be in the center of the cell, so that the four sides of the cell wall are vacant, or one side, two sides, and three sides are vacant so as not to provide a gap with the cell wall. Or Since the cell wall (partition wall) is bonded to a flat part around the convex part at the center of the cell, the width of the flat part is made larger than the width of the partition wall.

  The information display panel is formed by enclosing a plurality of cells (small chambers) containing a display medium between substrates so that dot matrix display is possible, and arranging line electrodes formed on each of the two substrates orthogonally. The display medium can be driven by the matrix-like counter electrode pair.

  The information display panel includes a plurality of cells (small chambers) containing a display medium enclosed between the substrates so that dot matrix display is possible, and the display medium is formed by a matrix-like counter individual electrode pair formed on each of the two substrates. Can also be driven.

  The cells are arranged in a lattice shape, but the shape may be any of a polygon such as a triangle, a quadrangle, a pentagon, and a hexagon, a circle, an ellipse, and a racetrack, or a combination of different shapes. Of these, polygons with rounded corners (especially quadrangles with rounded corners), circles, ellipses, and racetracks are preferred as the display medium that is easy to move.

  The shape of the convex part at the center of the cell is preferably the same as the cell shape, but even if it is different from the cell shape, it is a polygon such as a triangle, quadrilateral, pentagon, hexagon, circle, ellipse, race Any shape such as a track shape may be used, or different shapes may be combined. Of these, the same shape as the cell shape, such as a polygon with rounded corners (particularly, a quadrilateral with rounded corners), a circle, an ellipse, a racetrack shape, etc., is preferred as the display medium that is easy to move.

  The electrode may be located at the center with respect to the cell, and may or may not protrude from the convex portion at the center of the cell.

  5 to 8 are diagrams for explaining an example of the configuration of the information display panel obtained by the manufacturing method of the present invention.

  FIG. 5 and FIG. 6 each show the configuration of an information display panel in which two cells of a white display medium and a black display medium are sealed in one cell. The example shown in FIG. 5 is an example using the line electrodes 5 and 6, and shows a state where an electric field is applied from the line electrodes 5 and 6 and black dots are displayed on a white background. The example shown in FIG. 6 is an example using the individual electrodes 5 and 6, and shows a state in which an electric field is applied from the individual electrodes 5 and 6 and displayed with black dots on a white background.

  FIGS. 7 and 8 each show the configuration of an information display panel in which two cells of a white display medium and a black display medium are sealed in one cell. The example shown in FIG. 7 is an example in which the line electrodes 5 and 6 are used. An electric field is applied from the line electrodes 5 and 6 to form one display unit (one pixel: one dot) in three cells, and each of the RGB color filters 21R. , 21G, 21BL are arranged, and a red dot is displayed in one display unit. The example shown in FIG. 8 is an example in which the individual electrodes 5 and 6 are used, and an electric field is applied from the individual electrodes 5 and 6 to form one display unit (one pixel: one dot) in three cells, and each of the RGB color filters 21R. , 21G, and 21BL are arranged and white dots are displayed in one display unit.

  FIGS. 9 to 12 and FIGS. 13 to 16 are diagrams for explaining an example of the configuration of one cell in the present invention.

  The example shown in FIGS. 9-12 is a figure for demonstrating an example of the cell which comprised the counter electrode with the corresponding line electrode, respectively. In the example shown in FIG. 9, the central convex portion 13 has a trapezoidal cross section and a columnar state. In the example shown in FIG. 10, the central convex portion 13 has a triangular cross section and shows a columnar state. In the example shown in FIG. 11, the central convex portion 13 has a circular arc cross section and shows a dome shape. In the example shown in FIG. 12, the central convex portion 13 has a columnar shape with a circular arc cross section.

  The example shown in FIGS. 13 to 16 is a diagram for explaining an example of a cell in which a counter electrode is configured by a corresponding individual electrode. In the example shown in FIG. 13, the central convex portion 13 has a trapezoidal cross section and a columnar state. In the example shown in FIG. 14, the central convex portion 13 has a triangular cross section and shows a columnar state. In the example shown in FIG. 15, the central convex portion 13 has a circular arc cross section and shows a dome shape. In the example shown in FIG. 16, the central convex portion 13 has a columnar shape with a circular arc cross section.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples of the present invention. However, the present invention is not limited to the following examples.

An information display panel was manufactured by the following process.
(1) Production process of partition wall (rib) and electrode pattern on observation side transparent substrate (2) Production process of back side substrate with convex part at center of cell (3) Display medium to cell formed on observation side transparent substrate (3) Step of removing unnecessary display medium on the partition (4) Step of forming an adhesive layer on the partition (5) Step of bonding two substrates

<< Formation of partition walls, filling of display medium, and bonding of substrates >>: Common to each example and comparative example: A 320 μm square opening (this portion is a display cell) formed on a substrate 1 on which an ITO electrode is formed by a photoresist method. A grid-like partition wall pattern having a line width of 30 μm was prepared and used as a substrate 1 with a partition wall.
The height of the partition wall was adjusted by adjusting the resist film thickness so that the gap between the bottom surface of the central convex portion formed on the substrate 2 to be bonded and the substrate 1 and the substrate 1 was 40 μm.
The white display medium (negatively charged) and the black display medium (positively charged) configured as a particle group each containing a chargeable particle are arranged in a cell formed on the substrate 1 with the same volume so that the volume becomes 25 vol%. Thereafter, two substrates were bonded together to obtain an A4 size display panel.

<Example 1>
<Formation of electrode pattern>
A photoresist method is applied to a 30Ω / □ ITO film (thickness: 1 μm) in the direction of the short side of the surface of the display screen area (290 mm × 200 mm) of an A4 size glass substrate 1 having a thickness of 200 μm, and a length of 195 mm, a width A 300 μm line ITO electrode was patterned.
On the other hand, a linear copper electrode having a length of 295 mm, a width of 300 μm, and a thickness of 1 μm was formed by patterning on a 100 μm thick A4 size polyethylene terephthalate (PET) resin sheet.

《Formation of substrate sheet with convex part in the center of the cell》
This PET sheet with electrodes is embossed with a square (250 μm × 250 μm) convex stamping die with rounded corners from the surface side where no electrode is formed, and a convex part with a height of 20 μm is formed on the cell position corresponding part of the sheet. A substrate sheet with a line-shaped copper electrode pattern was prepared. The line-shaped copper electrode of the substrate sheet was obtained on the assumption that a part in the electrode pattern width direction and a part in the length direction were also applied to the flat part of the substrate sheet protruding from the convex part.
Next, the substrate sheet with a line-shaped copper electrode pattern having a convex portion having a height of 20 μm at the cell position corresponding portion is connected to the display screen region (290 mm × 200 mm) of the glass substrate 2 with the line-shaped copper electrode in the surface long side direction. The back side substrate was made by laminating in line.

<Comparative Example 1>
<Formation of electrode pattern>
A photoresist method is applied to a 30Ω / □ ITO film (thickness: 1 μm) in the direction of the short side of the surface of the display screen area (290 mm × 200 mm) of an A4 size glass substrate 1 having a thickness of 200 μm, and a length of 195 mm, a width A 300 μm line ITO electrode was patterned.
On the other hand, a linear copper electrode having a length of 295 mm, a width of 300 μm, and a thickness of 1 μm was formed by patterning on a glass substrate 2 having a thickness of 100 μm and an A4 size by sputtering.
Otherwise, in the same manner as in Example 1, partition wall formation, display medium filling, and substrate bonding were performed to obtain an A4 size display panel.

<Example 2>
In the formation of a substrate sheet with a convex portion at the center of the cell, line copper having a convex portion having a height of 10 μm is formed on the portion corresponding to the cell position of the sheet by embossing with a rounded square (250 μm × 250 μm) convex stamping die. An A4 size display panel was obtained in the same manner as in Example 1 except that the substrate sheet was provided with an electrode pattern. The line-shaped copper electrode of the substrate sheet was obtained on the assumption that a part of the electrode pattern width direction and length direction protruded from the convex portion and also a flat portion of the substrate sheet.

<Example 3>
In the formation of a substrate sheet with a convex portion at the center of the cell, a line-shaped copper having a convex portion with a height of 20 μm is formed in a portion corresponding to the cell position of the sheet by embossing with a rounded square (300 μm × 300 μm) convex stamping die. An A4 size display panel was obtained in the same manner as in Example 1 except that the substrate sheet was provided with an electrode pattern. The line-shaped copper electrode of this board sheet is assumed to be on the flat part of the board sheet, where the electrode pattern width direction is all in the convex part and part of the electrode pattern length direction protrudes from the convex part. Obtained.

<Example 4>
A line-shaped copper electrode having a dome-shaped convex portion with a height of 20 μm at the cell position corresponding to the cell position of the sheet by embossing with a circular dome-shaped (300 μmφ) convex pressing die in forming a substrate sheet with a convex portion at the center of the cell A display panel of A4 size was obtained in the same manner as in Example 1 except that the substrate sheet with a pattern was used. The line-shaped copper electrode of this board sheet is assumed to be on the flat part of the board sheet, where the electrode pattern width direction is all in the convex part and part of the electrode pattern length direction protrudes from the convex part. Obtained.

<Example 5>
<Formation of electrode pattern>
On the surface of the display screen area (290 mm x 200 mm) of the A4 size glass substrate 1 with a thickness of 200 μm, a 30 Ω / □ ITO film (thickness: 200 nm) is subjected to a photoresist method to form a 300 μm x 300 μm square individual ITO The electrode was patterned.
On the other hand, a rectangular individual copper electrode having a thickness of 300 μm × 300 μm and a thickness of 1 μm was formed by patterning on an A4-sized polyethylene terephthalate (PET) resin sheet having a thickness of 100 μm.

《Formation of substrate sheet with convex part in the center of the cell》
This PET sheet with electrodes is embossed with a square-shaped (250 μm × 250 μm) convex stamping die with rounded corners from the surface side where no electrode is formed, and a convex part with a height of 20 μm is formed on the cell position corresponding part of the sheet. A substrate sheet with an individual copper electrode pattern was prepared. The individual copper electrode of this substrate sheet was obtained on the assumption that a part of the electrode pattern also extends over the flat portion of the substrate sheet that protrudes from the convex portion.
Next, the substrate sheet with an individual copper electrode pattern having a convex portion having a height of 20 μm at the cell position corresponding portion was bonded to the surface of the display screen region (290 mm × 200 mm) of the glass substrate 2 to obtain a back side substrate.
An A4 size display panel was obtained in the same manner as in Example 1 except for the above.

<Example 6>
An individual copper electrode having a convex portion with a height of 10 μm at a cell position corresponding to a cell position of the sheet by embossing with a rounded square (250 μm × 250 μm) convex pressing die in the formation of a substrate sheet with a convex portion at the center of the cell An A4 size display panel was obtained in the same manner as in Example 4 except that the substrate sheet with a pattern was used. The individual copper electrode of this substrate sheet was obtained on the assumption that a part of the electrode pattern also extends over the flat portion of the substrate sheet that protrudes from the convex portion.

<Example 7>
An individual copper electrode having a convex portion with a height of 20 μm at the cell position corresponding to the cell position of the sheet by embossing with a rounded square (300 μm × 300 μm) convex pressing die in the formation of the substrate sheet with the convex portion at the center of the cell An A4 size display panel was obtained in the same manner as in Example 4 except that the substrate sheet with a pattern was used. The individual copper electrodes of the substrate sheet were all in the convex portion, and were obtained as not covering the flat portion of the substrate sheet.

<Example 8>
An individual copper electrode pattern having a dome-shaped convex portion with a height of 20 μm in a portion corresponding to a cell position of the sheet by embossing with a circular dome-shaped (300 μmφ) convex pressing die in the formation of a substrate sheet with a convex portion in the center of the cell An A4 size display panel was obtained in the same manner as in Example 1 except that the substrate sheet was provided. The individual copper electrode of this substrate sheet was obtained on the assumption that the electrode pattern was on all the convex portions, and part of the electrode pattern was applied to the flat portion of the substrate sheet protruding from the convex portion.

<Evaluation of Examples and Comparative Examples>
A drivability evaluation test was performed in which the A4 size display panel manufactured as described above was connected to a driving device and driven to display a test pattern (monochrome solid image).
In the driveability evaluation test, whether the display medium is driven when the applied voltage is 100 V, whether the display medium is driven when the applied voltage is 70 V, and when the applied voltage is 40 V, the display medium is It was visually evaluated whether or not to drive.
The results are shown in Table 1 below.

  From the result of Table 1, Examples 1-8 using the back substrate with a convex part at the center of the cell of the present invention have a low voltage of 40 V compared to Comparative Example 1 in which the convex part is not provided on the back substrate. It was found that the back substrate with a convex portion at the center of the cell of the present invention was effective in reducing the driving voltage.

  Information display panels subject to the manufacturing method of the present invention are electronic papers such as display units of mobile devices such as notebook computers, PDAs, mobile phones, handy terminals, electronic books, electronic newspapers, and electronic manuals (instruction manuals). , Billboards such as signboards, posters, blackboards, calculators, home appliances, car supplies, display units such as point cards, IC cards, electronic advertising, electronic point of purchase (POP), electronic It is suitably used as a display unit for price tags, electronic shelf labels, electronic musical scores, and RF-ID devices.

(A), (b) is a figure for demonstrating an example of the information display panel used as the object of the manufacturing method of this invention, respectively. (A), (b) is a figure for demonstrating the other example of the information display panel used as the object of the manufacturing method of this invention, respectively. (A)-(g) is a figure for demonstrating the whole flow of the manufacturing method of the information display panel of this invention, respectively. It is a figure which shows description of the embossing in FIG.3 (d). It is a figure for demonstrating an example of a structure of the information display panel obtained by the manufacturing method of this invention. It is a figure for demonstrating the other example of the structure of the information display panel obtained by the manufacturing method of this invention. It is a figure for demonstrating the further another example of the structure of the information display panel obtained by the manufacturing method of this invention. It is a figure for demonstrating the further another example of the structure of the information display panel obtained by the manufacturing method of this invention. It is a figure for demonstrating an example of a structure of 1 cell in this invention. It is a figure for demonstrating the other example of a structure of 1 cell in this invention. It is a figure for demonstrating the further another example of the structure of 1 cell in this invention. It is a figure for demonstrating the further another example of the structure of 1 cell in this invention. It is a figure for demonstrating the further another example of the structure of 1 cell in this invention. It is a figure for demonstrating the further another example of the structure of 1 cell in this invention. It is a figure for demonstrating the further another example of the structure of 1 cell in this invention. It is a figure for demonstrating the further another example of the structure of 1 cell in this invention.

Explanation of symbols

1, 2 Substrate 3 Display medium (particle group)
3W white display medium 3Wa white display medium particles (white negatively charged particles)
3B Black display medium 3Ba Black display medium particles (black positively charged particles)
4 Partition 5 and 6 Electrode 7 Cell 11 Sheet 12 Molding roller 13 Convex part 14 Flat part 15 Substrate 16 Adhesive 17 Feeding roller 21R Red color filter 21G Green color filter 21BL Blue color filter

Claims (4)

  A display medium configured as a particle group including a chargeable particle is sealed between two substrates, at least one of which is transparent, and an electric field is applied to the display medium to move the display medium and display information such as an image. In the manufacturing method of the information display panel, after forming an electrode with a rollable conductive material on a sheet that can be embossed at least for producing a substrate on the back side, a position corresponding to the center of each cell is formed. A method for producing an information display panel, characterized by embossing and molding into a convex shape to obtain a substrate with an electrode having a convex cell center.   2. The information according to claim 1, wherein the substrate with a convex electrode at the center of the cell is a substrate with a line-shaped electrode or a substrate with an electrode in which individual electrodes are arranged in a dot shape or a segment shape. Manufacturing method of display panel.   3. The method for manufacturing an information display panel according to claim 1, wherein an electrode material used for the electrode-attached substrate having a convex cell central portion is a metal.   The information display panel produced according to the method for manufacturing an information display panel according to any one of claims 1 to 3, wherein at least a substrate on the back side includes a substrate with a convex electrode at the center of the cell. .

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