JP2010145722A - Information display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information display panel capable of making a panel narrower in frame even when connection terminals of leading lines to connect electrodes of each panel substrate to a drive circuit side are brought together on one edge or two opposing edges of one panel substrate. <P>SOLUTION: The display panel has a structure formed by successively stacking and laminating a first substrate, a second substrate and a third substrate in such a manner that at least a transparent stripe electrode of the first substrate and a transparent stripe electrode of the second substrate are perpendicularly opposing to each other, at least two types of display media composed of particle groups containing chargeable particles are encapsulated in an information display screen area in the space between the first substrate and the second substrate, and a line electrode led from the stripe electrode of the first substrate and a line electrode for connection wiring to a drive circuit side of the third substrate are electrically connected; and the panel is configured to display information by moving the display media by an electric field generated by applying a voltage controlled by the drive circuit to an electrode pair composed of the opposing stripe electrodes. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention seals two types of display media different in color and charging polarity, which are configured as a particle group including a chargeable particle, in a plurality of cells provided between an observation side panel substrate and a back side panel substrate. Then, these two types of display media are driven to be inverted by an electric field formed by applying a voltage to a counter electrode formed by opposing the electrodes provided on the two panel substrates to display information such as an image. The present invention relates to an information display panel.

  Conventionally, a display medium is encapsulated between a transparent front substrate and a back substrate that does not need to be transparent, a voltage is applied between electrodes provided on each substrate, and an electric field is applied to the display medium. In the information display panel for displaying information such as images by moving the first stripe electrode made of a transparent inorganic conductive film provided at least in the display area of the front substrate; provided in at least the display area of the back substrate A second stripe electrode made of a metal film and provided substantially orthogonally to the first stripe electrode; and made of a metal film provided outside the display area of the rear substrate and connected to the second stripe electrode And a first lead line made of a metal film and connected to the first stripe electrode and provided outside the display area of the rear substrate. Information display panel, wherein it is known to be (for example, see Patent Document 1).

  9A to 9C are diagrams for explaining an example of the conventional information display panel described above. First, as shown in FIG. 9A, an inorganic conductive film such as transparent indium tin oxide (ITO) is provided at a position corresponding to at least the information display screen region 52 of the observation side substrate 51 made of a transparent film substrate or the like. The first stripe electrode 53 made of is formed by patterning. Next, as shown in FIG. 9B, the second stripe electrode 55, the second lead line 56, and the first lead line 57 are all formed of a metal film on the back side substrate 54. Are formed by patterning.

  At this time, when the observation-side substrate 51 and the back-side substrate 54 are overlapped with each other at a position corresponding to at least the information display screen area 52 on the back-side substrate 54, the second stripe electrode 55 is the first stripe electrode. 53 is formed so as to be substantially orthogonal. Further, the second lead line 56 is connected to the second stripe electrode 55 at a position outside the information display screen area 52 on the back side substrate 54 and is connected to one end surface of the panel (TCP: Tape Carrier Package mounting portion). To be formed). Further, the first lead line 57 is connected to the end of the first stripe electrode 53 when the observation side substrate 51 and the back side substrate 54 are overlapped at a position outside the information display screen area 52 of the back side substrate 54. And the end portion of the first lead wire 57 are formed from one end surface of the panel so as to overlap vertically.

  Finally, as shown in FIG. 9C, an anisotropic conductive connecting material 58 (here, anisotropic conductive sealant) containing conductive particles and having anisotropic conductivity is disposed on the outer periphery of the information display screen area 52. So as to surround the information display screen area 52, and the end of the first stripe electrode 53 and the end of the first lead line 57 overlap each other (a part of the drawing is marked with a circle). In this state, the information display panel is obtained by bonding the observation side substrate 51 and the back side substrate 54 together. Here, the anisotropic conductive sealant is used to establish conduction, but an adhesive that bonds two substrates can also have the function.

JP 2007-322805 A

  In the conventional information display panel described above, the connection terminals of the lead lines for connecting the electrodes of each panel substrate to the drive circuit are gathered on one side of one panel substrate, and this connection terminal, the drive circuit, If the lead wire of the other panel substrate is bent by 90 degrees, the lead wire is arranged so that the area becomes a so-called frame that cannot display information, and the entire panel surface Among them, the area that can be used as the display screen was narrow.

  Also, a technology for directly mounting a driving IC chip (COG: mounting an IC chip on a glass substrate, COF: IC chip) when connecting the connection terminals collected on one side of one panel substrate and the driving circuit. Is mounted on a film substrate, COP: IC chip is mounted on a plastic substrate), or a flexible cable substrate on which the driving IC chip is TAB mounted is used, the driving IC chip or the driving IC chip is TAB. Since a plurality of mounted flexible cable substrates have to be connected in a row, the use of a panel substrate having one side longer than the arranged length also leads to an increase in the frame.

  The present invention solves the above-described problems, and the connection terminals of the lead lines for connecting the electrodes of each panel substrate to the drive circuit are collected on one side of one panel substrate or on two opposite sides. However, the present invention intends to provide an information display panel that can achieve a narrow frame of the panel.

  An information display panel according to the present invention includes a first substrate in which a transparent stripe electrode is formed in an information display screen area, and a line electrode drawn from the stripe electrode is formed in an area other than the information display screen area, and an information display A second substrate in which a stripe electrode is formed in the screen area and a line electrode drawn from the stripe electrode is formed in an area other than the information display screen area, and a line electrode for connection wiring to the drive circuit is formed. Information on the facing space between the first substrate and the second substrate so that at least the transparent stripe electrode of the first substrate and the stripe electrode of the second substrate are orthogonally opposed to each other. In the display screen area, at least two types of display media configured as a group of particles including a chargeable particle are sealed, and line power drawn from the stripe electrode of the first substrate is used. And a line electrode for connection wiring to the drive circuit of the third substrate, and a structure in which the first substrate, the second substrate, and the third substrate are stacked in this order so as to be electrically connected. The display medium is configured to display information by moving the display medium with an electric field generated by applying a voltage controlled by a drive circuit to an electrode pair formed by opposing stripe electrodes. is there.

  As a preferred example of the information display panel according to the present invention, a line electrode drawn from the stripe electrode of the first substrate and a line electrode for connection wiring to the driving circuit of the third substrate are electrically connected. The means for connecting is an anisotropic conductive connecting material having conductive particles contained in a non-conductive resin, the thickness of the second substrate is 25 μm to 250 μm, the first The anisotropic conductive connecting material between the electrode on the substrate and the electrode on the third substrate is bent by bending at least one of the first substrate and the third substrate. The distance between the substrates is reduced to the length of the particle diameter of the conductive particles contained in the line, and the line electrode for connection wiring to the drive circuit of the third substrate is drawn out from the stripe electrode of the second substrate. On one side of the panel from which the line electrode is drawn, or The line electrode drawn out from the stripe electrode of the second substrate may be drawn out to the side opposite to one side of the panel from which the line electrode was drawn out, or to both the opposite sides of the panel.

  According to the present invention, a transparent substrate having a transparent stripe electrode formed in an information display screen area and a line electrode drawn from the stripe electrode in an area other than the information display screen area is formed in the information display screen area. A second substrate in which a stripe electrode is formed and a line electrode drawn from the stripe electrode is formed in a region other than the information display screen region, and a third electrode in which a line electrode for connection wiring to the drive circuit side is formed A line electrode drawn out from the stripe electrode of the first substrate in such a manner that at least the transparent stripe electrode of the first substrate and the stripe electrode of the second substrate are orthogonally opposed to each other; A structure in which a first electrode, a second substrate, and a third substrate are stacked and bonded together in this order so as to be electrically connected to a line electrode for connection wiring to a drive circuit of the substrate; Since, it is possible to reduce the area occupied by the line electrodes drawn from the stripe electrodes in a region other than the information display screen area, it is possible to reduce the frame portion.

  Further, according to the present invention, the information display screen is provided with the first substrate in which the transparent stripe electrode is formed in the information display screen area and the line electrode drawn from the stripe electrode is formed in the area other than the information display screen area. A second substrate in which a stripe electrode is formed in a region and a line electrode drawn from the stripe electrode is formed in a region other than the information display screen region, and a third electrode in which a line electrode for connection wiring to a drive circuit is formed A line electrode led out from the stripe electrode of the first substrate, and at least a transparent stripe electrode of the first substrate and a stripe electrode of the second substrate are orthogonally opposed to each other; A structure in which the first substrate, the second substrate, and the third substrate are stacked and bonded in this order so as to be electrically connected to the line electrode for connection wiring to the drive circuit of the substrate. Therefore, the connection portion on which the driving IC chip drawn from the stripe electrode of the first substrate is mounted and the connection portion on which the driving IC chip drawn from the stripe electrode of the second substrate is mounted are the same substrate. Instead of arranging them on the upper side, they are arranged on opposite sides of different substrates, so that the connection parts can be arranged with an overlap, and the connection parts on which the driving IC chips are mounted are arranged. By shortening the length and making the panel substrate size suitable for it, the frame portion occupied by the area other than the information display area on the panel surface can be reduced.

  First, the configuration of the information display panel that is the subject 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 the stability when the display information is rewritten or when the display information is continuously displayed. 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. In the example shown in FIGS. 1 (a) and 1 (b), at least two types of display media having different optical reflectivity and charging characteristics (here, configured as a particle group including particles having at least optical reflectivity and chargeability) The white display medium 3W configured as a particle group including the negatively charged white particles 3Wa and the black display medium 3B configured as a particle group including the positively charged black particles 3Ba are shown). In the cell, the substrates 1 and 2 correspond to the electric field generated by applying a voltage to the pixel electrode pair formed by the stripe electrode 6 provided on the substrate 2 and the stripe electrode 5 provided on the substrate 1 crossing each other at right angles. And move vertically. Then, the white display medium 3W is visually recognized by the observer as shown in FIG. 1A, or the black display medium 3B is visually recognized by the observer as shown in FIG. 1B. Are displayed in a matrix with black and white dots. In addition, in FIG. 1 (a), (b), the partition in front is abbreviate | omitted. Here, the partition walls are formed so that the cells correspond to the pixels, but the partition walls can be formed regardless of the position of the pixels.

  The information display panel according to the present invention is characterized in that a transparent stripe electrode is formed in the information display screen area based on the information display panel having the above-described configuration, and is drawn from the stripe electrode in an area other than the information display screen area. A first substrate on which line electrodes are formed, a second substrate on which stripe electrodes are formed in an information display screen region, and line electrodes drawn from the stripe electrode are formed in a region other than the information display screen region, and driving The third substrate on which the line electrode for connection wiring to the circuit is formed, with at least the transparent stripe electrode of the first substrate and the stripe electrode of the second substrate orthogonally opposed to each other, and At least two types of display media configured as a particle group including a chargeable particle are sealed in the information display screen area in the space between the first substrate and the second substrate. The first substrate, the second substrate, the line electrode drawn from the stripe electrode of the first substrate and the line electrode for connection wiring to the driving circuit of the third substrate are electrically connected. As a structure in which the third substrate is stacked and bonded in order, information is displayed by moving the display medium with an electric field generated by applying a voltage controlled by a drive circuit to an electrode pair formed by opposing stripe electrodes. It is in the point comprised so that it may perform.

  Hereinafter, specific examples of the information display panel of the present invention will be described with reference to the drawings.

<About the first embodiment>
FIGS. 2A to 2C are diagrams for explaining the first embodiment of the first substrate, the second substrate, and the third substrate that constitute the information display panel of the present invention. The first embodiment shown in FIGS. 2A to 2C shows an example in which the connection on the drive circuit side is performed on the same side.

  First, in the first substrate (observation side substrate) 12 shown in FIG. 2A, a transparent stripe electrode (transparent conductive film) 16 is formed in an information display screen area (area surrounded by a dotted line in the figure), It is configured as a transparent substrate in which a line electrode (conductive film) 21 drawn from the stripe electrode 16 is formed in a region other than the information display screen region. Next, in the second substrate (intermediate substrate) 11 shown in FIG. 2B, a stripe electrode (conductive film) 15 is formed in the information display screen region, and the stripe electrode 15 is formed in a region other than the information display screen region. It is configured as a film-like substrate on which the drawn line electrode (conductive film) 22 is formed. The line electrodes 22 collected corresponding to the number of connection terminals of the driving IC are connected to a flexible cable 23 on which one side of the panel is mounted with a driving IC connected to the external driving circuit side. . The thickness of the second substrate 11 is preferably as thin as possible, and the thickness of the film-like second substrate 11 is preferably 25 μm to 250 μm. Next, a third substrate (back substrate) 24 shown in FIG. 2C is a substrate on which a line electrode (conductive film) 25 for connection wiring to the drive circuit is formed. Is connected to the drive circuit side of the second substrate on the same side as the line electrode bent 90 degrees in the middle. A general circuit board such as a glass fiber reinforced epoxy board (glass epoxy board) or a flexible circuit board (FPC board) can be applied to the third board 24. The electrodes 25 are grouped according to the number of connection terminals of the driving IC, and the driving IC connected to the external driving circuit side is mounted on the same side as the side where the flexible cable 23 of the second substrate is disposed. The flexible cable 26 is connected. Note that a TCP (Tape Carrier Package) in which a driving IC is mounted on the flexible cables 23 and 26 can also be used.

  In this example, it corresponds to the line electrode 21 drawn from the stripe electrode 16 in an area other than the information display screen area of the first substrate 12 and the information display screen area of the first substrate in the third substrate 24 plane. The tip portion 25-A of the electrode 25 provided in a region other than the region and opposite to the side connected to the flexible cable 26 is the first substrate 12, the second substrate 11, and the third substrate. When the substrates 24 are superposed, they are arranged to correspond to each other, preferably facing each other. Further, in this example, when the flexible cable 23 of the second substrate and the flexible cable 26 of the third substrate 24 overlap the first substrate 12, the second substrate 11, and the third substrate 24. The upper and lower lengths of the third substrate 24 in the drawing are configured to be longer than the second substrate 11 so as to be arranged alternately. In this respect, since the flexible cable 23 and the flexible cable 26 are provided on different substrates, even if they overlap at the same position, it is possible to connect without problems by devising a connector that connects to the flexible cable. .

  FIGS. 3A and 3B are diagrams for explaining an example of the information display panel according to the present invention. FIG. 3A is a diagram of the information display panel viewed from the observation surface side. FIG. 3B is a diagram schematically showing a cross section along the line AA in FIG. In the example shown in FIGS. 3A and 3B, each component is displayed at a ratio of dimensions different from the actual dimensions so that the features of the information display panel of the present invention can be better understood. In particular, the structural members are omitted. In the example shown in FIGS. 3A and 3B, the first substrate 12, the second substrate 11 and the third substrate 24 shown in FIGS. 2A to 2C are overlapped in this order to display information. Panel is configured.

  In the example shown in FIGS. 3A and 3B, the first substrate 12, the second substrate 11, and the third substrate 24 are overlaid on the outer periphery of the information display screen region. A frame-shaped sealing agent 32 is provided on the outer peripheral portion of the inter-substrate gap securing partition wall 31 between the substrate 12 and the second substrate 11. Further, the display medium arranged layer 33 between the first substrate 12 and the second substrate 11 is sealed with a display medium configured as a particle group including a chargeable particle. For information display of a dot matrix display method in which an electric field is applied from an electrode pair formed by opposing and intersecting the formed transparent stripe electrode 16 and the stripe electrode 15 formed on the second substrate 11 to perform dot matrix display by passive drive. It is a panel. Note that in the example shown in FIGS. 3A and 3B, the display medium is not shown as only the display medium arrangement layer 33 is shown. The partition 31 for securing the inter-substrate gap, the frame-shaped sealing agent 32, and the sealing of the display medium are all the same as the configuration of the conventionally known information display panel.

  The greatest feature of the information display panel of the present invention is that in the example shown in FIGS. 3A and 3B, the line electrode 21 drawn from the stripe electrode 16 to a region other than the information display screen region of the first substrate 12. And the tip portion 25 -A of the electrode 25 provided in the region other than the information display screen region of the third substrate 24 and on the opposite side to the side connected to the flexible cable 26, the inter-substrate gap On one side outside the securing partition wall 31 and the frame-shaped sealant 32, electrical connection is made by an anisotropic conductive connecting material 34 such as an anisotropic conductive film (ACF) to conduct conduction between the substrates. It is a point. An anisotropic conductive film (ACF) is composed of an anisotropic conductive connecting material having a configuration in which conductive particles are contained in a non-conductive resin, and the electrical connection using this is the same as a conventionally known example. It is. An anisotropic conductive paste (ACP) may be used instead of the anisotropic conductive film (ACF).

  According to the information display panel of the present invention described above, the line electrode 21 drawn from the stripe electrode 16 of the first substrate 12 and the tip portion 25 -A of the electrode 25 of the third substrate 24 are anisotropically conductive. By connecting with the connection material 34, a driving voltage can be applied to the stripe electrode 16 of the first substrate 12 via the electrode 25 of the third substrate 24, the anisotropic conductive connection material 34, and the line electrode 21. it can. In the present invention, since the above configuration can be configured only by the anisotropic conductive connecting material 34 provided in a region other than the information display screen region, a narrower frame can be achieved as compared with the conventional configuration. In addition, when the connection to the drive circuit side is performed on the same side, the flexible cable 23 and the flexible cable 26 can be formed on different surfaces, respectively, so that the flexible cable 23 and the flexible cable 26 are allowed to overlap. Can do.

  FIG. 4 is a view for explaining another example of inter-substrate conduction using the anisotropic conductive connecting member 34 in the information display panel of the present invention. As shown in FIG. 4, when at least one of the first substrate 12 and the third substrate 24 is a flexible substrate (in the example of FIG. 4, the third substrate 24 is a flexible substrate), the anisotropic conductive film Even if the particle diameter of the conductive particles contained in (ACF) is small, the ACF connection can be made by bending the flexible substrate (herein, the third substrate 24) side.

<About the second embodiment>
FIGS. 5A to 5C are diagrams for explaining a second embodiment of the first substrate, the second substrate, and the third substrate that constitute the information display panel of the present invention. The second embodiment shown in FIGS. 5A to 5C shows an example in which the connection on the drive circuit side is performed on two opposite sides.

  First, in the first substrate (observation side substrate) 12 shown in FIG. 5A, a transparent stripe electrode (transparent conductive film) 16 is formed in an information display screen area (area surrounded by a dotted line in the figure), It is configured as a transparent substrate in which a line electrode (conductive film) 21 drawn from the stripe electrode 16 is formed in a region other than the information display screen region. Next, in the second substrate (intermediate substrate) 11 shown in FIG. 5B, a stripe electrode (conductive film) 15 is formed in the information display screen region, and the stripe electrode 15 is formed in a region other than the information display screen region. It is configured as a film-like substrate on which the drawn line electrode (conductive film) 22 is formed. The line electrodes 22 collected according to the number of connection terminals of the driving IC are connected to a flexible cable 23 on which one side of the panel is mounted with a driving IC connected to the external driving circuit side. The thickness of the second substrate 11 is preferably as thin as possible. Next, a third substrate (back side substrate) 24 shown in FIG. 5C is a substrate on which a line electrode (conductive film) 25 for connection wiring to the drive circuit is formed. Is connected to the side of the second substrate facing the connection part with the drive circuit side, and is bent 90 degrees in the middle to form a line electrode. A general circuit board such as a glass fiber reinforced epoxy board (glass epoxy board) or a flexible circuit board (FPC board) can be applied to the third board 24. The electrodes 25 are grouped according to the number of connection terminals of the driving IC, and the driving IC connected to the external driving circuit side is TAB on one side of the second substrate facing the side where the flexible cable 23 is disposed. It is connected to the mounted flexible cable 26.

  In this example, the line electrode 21 drawn from the stripe electrode 16 in a region other than the information display screen region of the first substrate 12 and a region other than the information display screen region of the third substrate 24 and connected to the flexible cable 26 The tip portion 25-A of the electrode 25 provided in the region opposite to the formed side corresponds when the first substrate 12, the second substrate 11, and the third substrate 24 are overlaid. It is arranged to be at a position, preferably facing and corresponding.

  FIG. 6 is a view for explaining another example of the information display panel of the present invention. In the example shown in FIG. 6, in order to better understand the characteristics of the information display panel of the present invention, each component is displayed at a ratio of dimensions different from the actual dimensions, and the components are partially omitted. it's shown. In the example shown in FIG. 6, the information display panel is configured by superimposing the first substrate 12, the second substrate 11, and the third substrate 24 shown in FIGS. 5A to 5C in this order. . Also in the example shown in FIG. 6, the configuration and effect of the anisotropic conductive connecting member 34 using the third substrate 24 that is a feature of the information display panel of the present invention is the same as the example of the first embodiment described above. It is.

<About the third embodiment>
FIGS. 7A to 7C are views for explaining a third embodiment of the first substrate, the second substrate, and the third substrate, respectively, constituting the information display panel of the present invention. The third embodiment shown in FIGS. 7A to 7C shows an example in which the connection on the drive circuit side is performed on two opposite sides.

  First, in the first substrate (observation side substrate) 12 shown in FIG. 7A, a transparent stripe electrode (transparent conductive film) 16 is formed in an information display screen area (area surrounded by a dotted line in the figure), It is configured as a transparent substrate in which a line electrode (conductive film) 21 drawn from the stripe electrode 16 is formed in a region other than the information display screen region. Next, in the second substrate (intermediate substrate) 11 shown in FIG. 7B, a stripe electrode (conductive film) 15 is formed in the information display screen region, and the stripe electrode 15 is formed in a region other than the information display screen region. It is configured as a film-like substrate on which the drawn line electrode (conductive film) 22 is formed. The line electrodes 22 collected corresponding to the number of connection terminals of the driving IC are connected to a flexible cable 23 on which one side of the panel is mounted with a driving IC connected to the external driving circuit side. . The thickness of the second substrate 11 is preferably as thin as possible. Next, a third substrate (back side substrate) 24 shown in FIG. 7C is a substrate on which a line electrode (conductive film) 25 for connection wiring to the drive circuit side is formed. In order to make the connecting portion with the side the same side as the connecting portion with the driving circuit side in the second substrate and the opposite side, the line electrode is bent 90 degrees in the middle. A general circuit board such as a glass fiber reinforced epoxy board (glass epoxy board) or a flexible circuit board (FPC board) can be applied to the third board 24. The electrodes 25 are grouped according to the number of connection terminals of the driving IC, and are connected to the external drive circuit side on the two sides of the side where the flexible cable 23 of the second substrate is disposed and the side opposite to the side. The IC for use is connected to the flexible cable 26 mounted with TAB.

  In this example, the line electrode 21 drawn from the stripe electrode 16 in a region other than the information display screen region of the first substrate 12 and a region other than the information display screen region of the third substrate 24 and connected to the flexible cable 26 The tip portion 25-A of the electrode 25 provided in the region opposite to the formed side corresponds when the first substrate 12, the second substrate 11, and the third substrate 24 are overlaid. It is arranged to be a position.

  FIG. 8 is a view for explaining still another example of the information display panel of the present invention. In the example shown in FIG. 8, in order to better understand the characteristics of the information display panel of the present invention, each component is displayed in a ratio of dimensions different from the actual dimensions, and the components are partially omitted. it's shown. In the example illustrated in FIG. 8, the information display panel is configured by superimposing the first substrate 12, the second substrate 11, and the third substrate 24 illustrated in FIGS. 7A to 7C in this order. . Also in the example shown in FIG. 8, the configuration and effect of the anisotropic conductive connecting material 34 using the third substrate 24 that is a feature of the information display panel of the present invention are the same as those in the above-described first embodiment. It is.

  Next, each structural member which comprises the information display panel of this invention is demonstrated.

  The first substrate must be transparent, such as ester resins such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), olefin resins such as polyethylene (PE) and polypropylene (PP), and polymethyl methacrylate. Polymer films and polymer sheets such as acrylic resins such as (PMMA), polycarbonate (PC), polyethersulfone (PES), and polyimide (PI) can be used. Glass can also be used.

  Since the second substrate does not require transparency, various films can be used in addition to the polymer film described above. Since it is necessary to connect the first substrate and the third substrate using an anisotropic conductive connecting material, it is preferable that the distance is short, and the second substrate is disposed between the first substrate and the third substrate. The substrate is preferably thin. Therefore, a film-like substrate is preferable.

  Since the third substrate does not need to be transparent or thin, a wide variety of materials can be selected and used. In addition to the polymer film and glass used for the first substrate and the second substrate, a glass epoxy resin plate or the like can also be suitably used. A substrate in which an insulating film is formed over a metal plate can also be used.

  In order to electrically connect using the conductive connection material in a state where the second substrate is sandwiched between the first substrate and the third substrate, at least one of the first substrate and the third substrate is It is preferable to bend. In particular, when a conductive connecting material containing conductive particles is used, it is necessary to narrow the distance between the substrates that conduct electricity to the length of the particle diameter of the conductive particles, so that at least one of the first substrate and the third substrate is used. It is preferable since the conduction between the substrates can be obtained regardless of the particle diameter of the conductive particles by bending. Therefore, it is desirable that either the first substrate or the third substrate is a flexible film substrate.

  Conductive connection materials include anisotropic conductive films (ACF) in which conductive particles are dispersed in a non-conductive thermosetting resin and formed into a film, or non-conductive without forming into a film. An anisotropic conductive paste (ACP) in which conductive particles are dispersed in a conductive thermosetting resin to form a paste is preferably used. As the conductive particles, those having a surface of a spherical resin having an average particle diameter of about 3 to 5 μm plated with nickel or gold, or those having an outer surface of the spherical resin having an average particle diameter of about 3 to 5 μm coated with a conductive material are used. It is done. In addition, when producing bumps on the connection electrode portions of the first substrate and the third substrate, a non-conductive film (NCF) containing no conductive particles or a non-conductive paste (Non Conductive Paste) : NCP) can also be used.

  The pixel formed by the counter electrode pair and the cell in which at least two kinds of display media are combined can be made to correspond or can not be made to correspond to each other. When performing color display by combining the three primary color filter and white display medium or black display medium, or when performing color display by combining the three primary color display medium and black display medium or the three primary color display medium and white display medium, It is preferable to associate the pixel with the cell.

  A cell can be formed by providing a partition between opposing substrates on which a display medium is arranged, or a cell can be formed as a microcapsule in which the display medium is sealed. In addition, an inter-substrate gap securing partition provided to secure the counter-substrate gap, and a cell-forming partition that functions to suppress movement of particles as a display medium in a direction parallel to the panel substrate are provided. In this case, the width of the inter-substrate gap securing partition wall is preferably in the range of 20 μm to 100 μm, and the width of the cell forming partition wall is preferably as narrow as possible in the range of 5 μm to 30 μm. Furthermore, the cell forming partition may be lower than the height of the inter-substrate gap securing partition, and the range that does not impair the function of suppressing the movement of particles as a display medium in a direction parallel to the panel substrate. . The cell-forming partition wall may be formed at the opposing position of both panel substrates, and may be configured to face each other when the substrates are overlapped. In this case, the opposing portions may or may not be joined.

  The cell shape may be a polygon (square with rounded corners, stepped octagon with rounded corners, etc.) matching the pixel shape and pixel arrangement, or a polygon regardless of the pixel shape or pixel arrangement. By using the polygonal shape, the ratio of the partition wall portion serving as the non-display area can be reduced, and the aperture in the information display area is increased. It is preferable that the partition walls are formed in a lattice shape so that the positions correspond to the pixels arranged in a matrix shape. A cell shape having a curve is preferable from the viewpoint that the particles constituting the display medium can be easily moved, and a rectangle or a staircase octagon is preferable from the point of correspondence between the pixel and the cell. A stepped octagon with rounded corners is preferably used.

  A dry film resist material is suitably used as a material for forming a partition provided for securing the inter-substrate gap, a partition provided at an area boundary for securing the inter-substrate gap and performing different display colors, and a partition dedicated for cell formation. As an example, Alfo NIT2 (manufactured by Nichigo Morton) or PDF300 (manufactured by Nippon Steel Chemical Co., Ltd.) can be used.

  A dry film resist material having a thickness corresponding to the height of the partition wall to be formed is laminated on the panel substrate, and patterned by a photolithography method using a photomask having a predetermined shape.

  The width of the partition wall portion for securing the inter-substrate gap is in the range of 20 μm to 100 μm, the width of the partition wall portion for forming the cell is in the range of 5 to 30 μm, and the width of the partition wall portion for forming the cell is secured to the gap between the substrates. Smaller than the width of the partition wall portion.

  Among the conductive materials that pattern the conductive film to form electrodes, a transparent conductive film is obtained on the first substrate that becomes the transparent substrate on the observation side. Indium tin oxide (ITO), indium oxide, zinc-doped indium oxide (IZO) ), Transparent conductive metal oxides such as aluminum-doped zinc oxide (AZO), antimony tin oxide (ATO), conductive tin oxide, and conductive zinc oxide, and transparent conductive polymers such as polyaniline, polypyrrole, and polythiophene. Use.

  Of the conductive material used as an electrode by patterning the conductive film, indium tin oxide (ITO) is used for the second substrate and the third substrate that are not arranged on the observation side, and in the region other than the information display screen region of the first substrate. ), Indium oxide, zinc-doped indium oxide (IZO), aluminum-doped zinc oxide (AZO), antimony tin oxide (ATO), conductive tin oxide, conductive zinc oxide and other conductive metal oxides, polyaniline, polypyrrole, Conductive polymers such as polythiophene, metals such as gold, silver, copper, aluminum, nickel, and chromium, and alloys containing these metals as main components are used. The conductive film used as these electrodes may be transparent or may not be transparent.

  As a method for forming a conductive film as an electrode, a thin film or a metal foil (for example, rolled copper) may be used for the above-described materials by sputtering, vacuum deposition, CVD (chemical vapor deposition), coating, plating, or the like. A method of laminating a foil) and a method of applying a conductive agent mixed with a solvent or a synthetic resin binder. The above-mentioned material that can be patterned and is electrically conductive can be preferably used. In addition, the thickness of the transparent electrode on the observation side is preferably 0.01 to 10 μm, more preferably 0.05 to 5 μm, as long as conductivity can be secured and light transmittance is not hindered. The thickness of the electrode that is not on the observation side is only required to ensure conductivity, and is set in the range of 0.01 to 10 μm.

  A transparent conductive material suitable as an electrode provided on the observation side substrate (first substrate) is less flexible than a metal material. When the observation side electrode is a line electrode, it is preferably used in combination with a fine metal wire in order to prevent disconnection in the transparent electrode material. The width of the fine metal wire is preferably 1 μm to 10 μm because it does not hinder display visibility. The electrodes provided on the back side substrate (third substrate) and the intermediate substrate (second substrate) do not need to consider light transmission, so the metal material having low electrical resistance and excellent flexibility is preferably used. Used.

  Hereinafter, an actual example will be described. In Examples 1 to 5 below, the line electrode for the connection wiring to the drive circuit side formed on the third substrate is a stripe electrode extending from the portion where the anisotropic conductive connection material is arranged to the drive circuit side. Patterning into an L-shape bent 90 degrees at the portion where the flexible cable for connection is arranged, and connecting terminal portions to the drive circuit side provided on the third substrate are all on the same side and on the second substrate It is configured on the same side as the connection terminal portion on the drive circuit side to be provided. As the shape for bending the stripe-shaped line electrode by 90 degrees, besides the L-shape, a circular arc may be drawn, or a shape in which obtuse angles are combined and connected.

<Example 1>
A film with a transparent electrode using ITO (tin-doped indium oxide) formed in a stripe shape on a transparent polyethylene terephthalate (PET) resin substrate having a thickness of 125 μm was produced as a first substrate. A second substrate in which an electrode using ITO (tin-doped indium oxide) is formed in a stripe shape in a direction orthogonal to the stripe-shaped electrode formed on the first substrate on a transparent PET resin substrate having a thickness of 125 μm is manufactured. did. The electrode of the second substrate was electrically connected to the TCP on which the driving IC was mounted using ACF in the outer portion of the information display screen area. A copper electrode patterned as an L-shaped stripe was prepared by etching a polyimide film laminated with a copper foil as the third substrate. The first electrode and the third electrode were electrically connected using ACF outside the information display screen area. In addition, the electrode formed on the third substrate was electrically connected to the TCP on which the driving IC was mounted using an ACF at a portion opposite to the portion connected to the first substrate. The TCP with the driving IC connected to the second substrate and the third substrate was connected to the driving circuit side using a connector, and display was performed in the information display screen area. As a result, both vertical and horizontal display could be performed satisfactorily without disconnection or leakage.

<Example 2>
A transparent electrode film using ITO (tin-doped indium oxide) formed in a stripe shape on a transparent PET resin substrate having a thickness of 125 μm was prepared as a first substrate. A second substrate in which an electrode using ITO (tin-doped indium oxide) is formed in a stripe shape in a direction orthogonal to the stripe-shaped electrode formed on the first substrate on a transparent PET resin substrate having a thickness of 125 μm is manufactured. did. The electrode of the second substrate was electrically connected to the TCP on which the driving IC was mounted using ACF in the outer portion of the information display screen area. As a third substrate, an electrode film in which an aluminum electrode was formed in an L-shaped stripe on a 125 μm transparent PET film was prepared. The first electrode and the third electrode were electrically connected using ACF outside the information display screen area. In addition, the electrode formed on the third substrate was electrically connected to the TCP on which the driving IC was mounted using an ACF at a portion opposite to the portion connected to the first substrate. The TCP with the driving IC connected to the second substrate and the third substrate was connected to the driving circuit side using a connector, and display was performed in the information display screen area. As a result, both vertical and horizontal display could be performed satisfactorily without disconnection or leakage.

<Example 3>
A transparent electrode film using indium oxide formed in a stripe shape on a transparent PET resin substrate having a thickness of 250 μm was produced as a first substrate. A second substrate in which an electrode made of ITO (tin-doped indium oxide) in a stripe shape is formed on a transparent PET resin substrate having a thickness of 250 μm in a direction perpendicular to the stripe electrode formed on the first substrate is produced. did. The electrode of the second substrate was electrically connected to the TCP on which the driving IC was mounted using ACF in the outer portion of the information display screen area. A copper electrode patterned as an L-shaped stripe was prepared by etching a polyimide film laminated with a copper foil as the third substrate. The first electrode and the third electrode were electrically connected using ACF outside the information display screen area. In addition, the electrode formed on the third substrate was electrically connected to the TCP on which the driving IC was mounted using an ACF at a portion opposite to the portion connected to the first substrate. The TCP with the driving IC connected to the second substrate and the third substrate was connected to the driving circuit side using a connector, and display was performed in the information display screen area. As a result, both vertical and horizontal display could be performed satisfactorily without disconnection or leakage.

<Example 4>
A transparent electrode film using indium oxide formed in a stripe shape on a transparent PET resin substrate having a thickness of 250 μm was produced as a first substrate. A second substrate in which an electrode made of ITO (tin-doped indium oxide) in a stripe shape is formed on a transparent PET resin substrate having a thickness of 250 μm in a direction perpendicular to the stripe electrode formed on the first substrate is produced. did. The electrode of the second substrate was electrically connected to the TCP on which the driving IC was mounted using ACF in the outer portion of the information display screen area. As a third substrate, an electrode film in which an aluminum electrode was formed in an L-shaped stripe on a 250 μm transparent PET film was prepared. The first electrode and the third electrode were electrically connected using ACF outside the information display screen area. In addition, the electrode formed on the third substrate was electrically connected to the TCP on which the driving IC was mounted using an ACF at a portion opposite to the portion connected to the first substrate. The TCP with the driving IC connected to the second substrate and the third substrate was connected to the driving circuit side using a connector, and display was performed in the information display screen area. As a result, a line that does not operate due to disconnection may be seen in a part of the electrodes of the first substrate. As a result of observing details of the defective display panel, it was found that the aluminum electrode of the third electrode film was scratched by a step at the edge portion of the second electrode film, causing disconnection.

<Example 5>
A transparent electrode film using ITO (tin-doped indium oxide) formed in a stripe shape on a transparent PET resin substrate having a thickness of 125 μm was prepared as a first substrate. A second substrate in which an electrode using ITO (tin-doped indium oxide) is formed in a stripe shape in a direction perpendicular to the stripe-shaped electrode formed on the first substrate on a transparent PET resin substrate having a thickness of 25 μm is manufactured. did. The electrode of the second substrate was electrically connected to the TCP on which the driving IC was mounted using ACF in the outer portion of the information display screen area. A copper electrode patterned as an L-shaped stripe was prepared by etching a polyimide film laminated with a copper foil as the third substrate. The first electrode and the third electrode were electrically connected using ACF outside the information display screen area. In addition, the electrode formed on the third substrate was electrically connected to the TCP on which the driving IC was mounted using an ACF at a portion opposite to the portion connected to the first substrate. The TCP with the driving IC connected to the second substrate and the third substrate was connected to the driving circuit side using a connector, and display was performed in the information display screen area. As a result, both vertical and horizontal display could be performed satisfactorily without disconnection or leakage.

  Information display panels subject to the present invention include display devices for mobile devices such as notebook computers, PDAs, mobile phones, handy terminals, electronic papers such as electronic books, electronic newspapers, and electronic manuals (instruction manuals), signboards, Poster, blackboard and other bulletin boards, calculators, home appliances, automotive parts display, point card, IC card display, electronic advertising, electronic point of purchase (POP), electronic price tag, electronic It is suitably used as a display unit (so-called rewritable paper) that performs display rewriting by connecting to a shelf label, electronic score, display unit of an RF-ID device, or external display rewriting means.

(A), (b) is a figure for demonstrating an example of the information display panel used as the object of the drive method of this invention, respectively. (A)-(c) is a figure for demonstrating 1st Embodiment of the 1st board | substrate, the 2nd board | substrate, and the 3rd board | substrate which respectively comprise the information display panel of this invention. (A), (b) is a figure for demonstrating an example of the information display panel of this invention, respectively. It is a figure for demonstrating the other example of the ACF connection part in the information display panel of this invention. (A)-(c) is a figure for demonstrating 2nd Embodiment of the 1st board | substrate which comprises the information display panel of this invention, a 2nd board | substrate, and a 3rd board | substrate, respectively. It is a figure for demonstrating the other example of the information display panel of this invention. (A)-(c) is a figure for demonstrating 3rd Embodiment of the 1st board | substrate, 2nd board | substrate, and 3rd board | substrate which respectively comprise the information display panel of this invention. It is a figure for demonstrating the further another example of the information display panel of this invention. (A)-(c) is a figure for demonstrating an example of the conventional information display panel, respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 2 Substrate 3W White display medium 3Wa White negatively charged particle 3B Black display medium 3Ba Black positively charged particle 4 Bulkhead 5, 6 Electrode 11 Second substrate 12 First substrate 15, 16 Striped electrode 21, 22 Line electrode 23, 26 Flexible cable 24 Third substrate 25 Electrode 25-A Tip portion 31 Separation gap for securing gap between substrates 32 Frame-shaped sealing agent 33 Display medium arrangement layer 34 Anisotropic conductive connecting material

Claims (5)

  A transparent stripe electrode is formed in the information display screen area, a first substrate on which a line electrode drawn from the stripe electrode is formed in an area other than the information display screen area, and a stripe electrode is formed in the information display screen area; At least a first substrate on which a line electrode drawn from the stripe electrode is formed in a region other than the information display screen region and a third substrate on which a line electrode for connection wiring to the drive circuit is formed. In the information display screen region in the space between the first substrate and the second substrate, the chargeable particles are placed so that the transparent stripe electrode of the substrate and the stripe electrode of the second substrate are orthogonally opposed to each other. At least two types of display media configured as a group of contained particles are sealed, a line electrode drawn from the stripe electrode of the first substrate, and a drive circuit side of the third substrate As a structure in which the first substrate, the second substrate, and the third substrate are stacked in this order so as to be electrically connected to the connection wiring line electrode, an electrode pair formed by opposing stripe electrodes An information display panel configured to display information by moving the display medium with an electric field generated by applying a voltage controlled by a driving circuit.   The means for electrically connecting the line electrode drawn from the stripe electrode of the first substrate and the line electrode for connection wiring to the driving circuit of the third substrate includes conductive particles in the non-conductive resin. The information display panel according to claim 1, wherein the information display panel is an anisotropic conductive connecting material having a configuration as described above.   3. The information display panel according to claim 1, wherein the second substrate has a thickness of 25 μm to 250 μm.   The anisotropic conductive connecting material between the electrode on the first substrate and the electrode on the third substrate is bent by bending at least one of the first substrate and the third substrate, and the anisotropic The information display panel according to any one of claims 1 to 3, wherein the distance between the substrates is narrowed to the length of the particle diameter of the conductive particles contained in the conductive connecting material.   A line electrode for connection wiring to the driving circuit of the third substrate is arranged on one side of the panel from which the line electrode drawn from the stripe electrode of the second substrate is drawn, or the stripe of the second substrate. 5. The line electrode according to claim 1, wherein the line electrode drawn out from the electrode is drawn out to a side opposite to one side of the drawn panel or to both sides facing the panel. Information display panel.

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