JP2011221406A - Information displaying panel and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information displaying panel allowing the retention of an environment for a long period of time, the environment in which the display medium is initially arranged, and the realization of invariable display performance because of the fact the performance of an arranged display medium can be limited from being changed by an influence of heat, and that an external environmental gas, especially moisture, can be sufficiently limited from entering the inside of the panel, and to provide a method for producing the information displaying panel.SOLUTION: The information displaying panel includes: a display panel part formed in such a manner that two substrates face each other with a gap, the substrates in which conductive films are respectively formed in screen areas used for displaying information, and at least one of which is transparent; an information displaying panel front frame 41 in which flexible cables 32 and 36 are implemented in the display panel part; and two resin sheets 42-1 and 42-2 adhered to both surfaces of the information displaying panel front frame using a thermal fusing material, and adhered to each other at the periphery of the display panel part using the thermal fusing material, with the flexible cables sandwiched between the two resin sheets.

Description

  In the present invention, an electrically drivable display medium is sealed in a space between two substrates formed by opposing two conductive film substrates, at least one of which is transparent, and the display medium is electrically driven. The present invention relates to an information display panel with a flexible cable for connection to an external drive circuit that enables the displayed information to be observed, and a method for manufacturing the same.

  As an information display device that replaces a conventional liquid crystal display device (LCD), a system in which charged particles are moved in a gas, a system in which charged particles are moved in a liquid (electrophoresis system), and two colors are configured. Visibility to see what is drawn on paper is obtained by using a technology that visually recognizes the reflected light from particles used as a display medium, such as a two-color particle rotation method that rotates charged particles in gas or liquid. An information display device has been proposed. Compared to LCDs, these technologies can provide a wide viewing angle that is close to that of ordinary printed materials and display memory characteristics, so that it can be made into a low power consumption type that only needs to be supplied when rewriting the display. Since it has advantages over conventional LCDs, it is considered as a technology that can be used in the next generation of inexpensive information display devices, and is expected to be deployed in information display devices for mobile terminals, electronic paper type information display devices, etc. Has been. In particular, recently, a flexible information display panel using a transparent resin sheet as a panel substrate has been proposed, and expectation as an electronic paper excellent in portability is expected.

  Among them, a gas space between at least one transparent substrate formed by opposing two conductive film-coated substrates is configured as a particle group including particles having at least optical reflectivity and chargeability, and optically mutually. Charged particle flight in which at least two types of display media having different optical reflectivities and charging characteristics are arranged, and information is displayed by flying and moving the display medium with an electric field generated between the electrodes by a voltage applied between the opposing electrode pairs. The mobile information display panel is expected as an electronic paper device from the viewpoint of display memory properties (see Patent Document 1).

  In an information display panel using such chargeable particles as a display medium, when moisture enters from the external environment, the driveability of the display medium is affected, and in many cases the driveability deteriorates. A sealing material serving as a barrier against moisture ingress from the external environment is disposed around the. When a polyethylene terephthalate (PET) sheet substrate is used instead of arranging the sealing material, a structure in which the periphery of the substrate is heat sealed is also disclosed (see Patent Document 2).

WO2003 / 075087 Japanese Patent Laid-Open No. 2005-84408

  2. Description of the Related Art Conventionally, a technique of arranging a sealing material between panel substrates of an information display panel, that is, around a panel in order to seal a side surface of the panel has been used. This sealing material is arranged in the gap between the panel substrates and exhibits sealing properties by being in close contact with the two panel substrates, but when sealing between the panel substrates of thin information display panels, the entire panel However, even if it is slightly bent, the adhesion between the substrate and the sealing material becomes insufficient, and moisture may enter from the external environment, which may impair the display drive performance of the information display panel.

  Also, Patent Document 2 discloses a technique of using a polyethylene terephthalate (PET) sheet as a panel substrate and heat-sealing the periphery of the panel. This information display panel has a voltage applied to an electrode pair disposed in an information display area. Therefore, it is not necessary to consider the sealing property of the wiring part from the power supply outside the panel unit to the electrode pair arranged in the information display area. In heat sealing, the sealing property of the surface where PETs are combined can be taken, but the sealing property with other members such as wiring and flexible cables formed with wiring cannot be taken. For this reason, moisture may easily enter from the external environment, and the display drive performance of the information display panel may be impaired.

  Furthermore, in order to heat-seal a panel substrate such as PET resin, a high-temperature heat treatment exceeding 150 ° C. is used. Therefore, it is necessary to prevent the display medium from being damaged by heat. There is a problem that a so-called frame portion outside the information display area becomes large.

  The object of the present invention is to solve the above-mentioned problems, and to suppress the performance of the arranged display medium from being affected by heat, and to prevent the external environmental gas from entering the panel, particularly moisture. Providing an information display panel capable of maintaining the same environment as the initial display over a long period of time and providing an unchanging display performance and a method for manufacturing the same It is something to try.

  An information display panel according to the present invention includes a display panel portion formed by opposing two transparent substrates, each having a conductive film formed in a screen area for displaying information, with a gap therebetween, and a display panel portion. The information display panel precursor on which the flexible cable is mounted and the information display panel precursor are bonded to each other by the heat-sealing material, and the flexible cable is sandwiched between the outer peripheral portions of the display panel portion by the heat-sealing material. And two resin sheets to be bonded together.

  Further, as a preferred example of the information display panel of the present invention, the flexible cable is equipped with a driver IC for controlling and driving the display panel unit, and the display panel unit is provided with the opposing conductive film. It is configured in a dot matrix display system in which the electrode pairs formed in 1 are arranged in a matrix as one pixel, and a color filter is formed between a transparent substrate at least on the viewing side of the display panel section and a transparent resin sheet In other words, an adhesive material, an adhesive material, or a sealing material may be disposed between the heat sealing material surface of the resin sheet and the flexible cable surface.

  The information display panel manufacturing method of the present invention is the information display panel manufacturing method described above, and includes an information display panel precursor preparation step for mounting a flexible cable on the display panel portion, and a larger area than the display panel portion. The heat fusion material is formed so as to be embossed on one surface of the resin sheet so that the embossed valleys are aligned obliquely forward from the center in the width direction of the resin sheet toward the edge in the width direction. A resin sheet forming step with a bonding material, a bonding step in which the resin sheet with a heat bonding material is positioned on the substrate surface of the display panel unit, and then moved while pressing the heat roller and bonded together, and two heat bonding And a sealing step for sealing the outer peripheral portion of the resin sheet with a material by thermocompression bonding.

  Moreover, as a suitable example of the manufacturing method of the information display panel of the present invention, the heat-sealing material layer provided in an embossed shape on one surface of the resin sheet has an emboss height of 1 μm to 5 μm and a total thickness. 5 μm to 10 μm.

  According to the information display panel of the present invention, both the front and back panel surfaces of the information display panel precursor have a larger area than the panel surface and can be heat-sealed at a temperature of 100 ° C. to 150 ° C. The resin sheet in which the material is arranged on one side is overlapped, and the panel surface and the resin sheet are first bonded with a heat-sealing material using a heat roller, and then the outer peripheral portion of the panel surface is Since the flexible cable mounted on the information display panel precursor is sandwiched by thermo-compression so as to be sandwiched, it is possible to suppress the performance of the arranged display medium from being affected by heat and to be changed. Since it is possible to sufficiently suppress the entry of external environmental gas into the panel, especially the entry of moisture, the environment in which the display medium is arranged can be kept the same as the initial state for a long period of time, and the display is unchanged. Get performance It is.

  In addition, according to the information display panel of the present invention, it is possible to suppress the electrolytic corrosion that the electrode formed on the display panel portion corrodes while the energization to the pixel electrode is repeated, so that the wire is not disconnected even if the energization is repeated. became.

  Furthermore, according to the method for manufacturing an information display panel of the present invention, the resin sheet with the heat-sealing material is arranged in an embossed manner so that the embossed valleys are connected to each other. The information display panel having excellent display performance can be obtained because it can be bonded to the substrate surface without leaving bubbles.

(A), (b) is a figure which shows an example of the fundamental structure of the information display panel used as the object of this invention, respectively. (A), (b) is a figure which shows the other example of the fundamental structure of the information display panel used as the object of this invention, respectively. (A), (b) is a figure which shows the further another example of the fundamental structure of the information display panel used as the object of this invention, respectively. (A), (b) is a figure which shows an example of the specific structure of the information display panel of this invention, respectively. (A), (b) is a figure which shows the other example of the concrete structure of the information display panel of this invention, respectively. (A), (b) is a figure for demonstrating an example of the manufacturing method of the information display panel of this invention, respectively. (A)-(c) is a figure for demonstrating a specific example of the manufacturing method of the information display panel of this invention, respectively. (A)-(c) is a figure for demonstrating the other specific example of the manufacturing method of the information display panel of this invention, respectively. (A), (b) is a figure for demonstrating an example which forms an embossing part in the surface of the heat sealing | fusion material layer provided in the resin sheet, respectively. (A), (b) is a figure for demonstrating the other example which forms an embossing part in the surface of the heat sealing | fusion material layer provided in the resin sheet, respectively. (A), (b) is a figure for demonstrating an example of the embossing part arrangement | positioning of the heat sealing | fusion material in the manufacturing method of the information display panel of this invention, respectively. (A)-(f) is a figure for demonstrating an example of the method of bonding a resin sheet to the panel surface of the information display panel precursor using an embossed heat-fusion material layer, respectively. (A), (b) is a figure for demonstrating an example of the method of sealing the display panel part by thermocompression-bonding the resin sheet part around the information display panel precursor, respectively.

<Regarding Basic Structure and Display Method of Display Panel Unit in Information Display Panel of Present Invention>
First, a basic configuration of a charged particle driving type display panel unit which is an example of a display panel unit in the information display panel of the present invention will be described. In the display panel unit, an electric field is applied from a counter electrode pair 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 moving direction of the display medium is switched by a change in the electric field direction, whereby information such as an image is displayed. Therefore, it is necessary to design the display panel unit so that the display medium can move uniformly and maintain the stability when the display information is rewritten or when the displayed 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 a charged particle drive type display panel unit that is a subject of the present invention (a flexible cable mounting unit is not shown) will be described with reference to FIGS. 1 (a), 1 (b) to 3 (a) to 3 (d).

  In the example shown in FIGS. 1A and 1B, at least two types of display media (in this case, including negatively charged white particles 3Wa) configured as a particle group including particles having at least optical reflectance and chargeability are included. A white display medium 3W configured as a particle group and a black display medium 3B configured as a particle group including positively chargeable black particles 3Ba) in each cell formed by the partition walls 4, the glass substrate 1 on the back side. It is generated by applying a voltage between a pair of pixel electrodes formed by the electrodes 5 (striped electrodes) provided on the transparent electrode 6 and the transparent electrodes 6 (striped electrodes) provided on the transparent glass substrate 2 on the observation side facing each other. The substrate is moved perpendicular to the substrates 1 and 2 according to the electric field. Then, the white display medium 3W is visually recognized by the observer as shown in FIG. 1A, or the white display is displayed by the observer, or the black display medium 3B is visually recognized by the observer as shown in FIG. Is displayed in a matrix with black and white dots.

  In this example, the resin sheet 12 is formed on the outside of the glass substrate 1 via the heat sealing material layer 11, and the transparent resin sheet 14 is formed on the outside of the transparent glass substrate 2 via the transparent heat sealing material layer 13. is doing. Reference numeral 15 denotes an adhesive. In addition, in FIG. 1 (a), (b), the partition in front is abbreviate | omitted. Here, an example is shown in which cells and pixels (dots) correspond one-to-one. Furthermore, in this example, although the glass substrate 1 and the transparent glass substrate 2 are used, it can be set as the display panel part which can be bent if it uses a thin glass film board | substrate with the thickness of the range of 25 micrometers-200 micrometers. Furthermore, a resin substrate and a transparent resin substrate can be used instead of the glass substrate. Also in this case, the display panel can be bent by using a flexible resin substrate.

  In the example shown in FIGS. 2 (a) and 2 (b), at least two types of display media (here, including negatively charged white particles 3Wa) configured as a particle group including particles having at least optical reflectance and chargeability are included. In the state where the white display medium 3W configured as a particle group and the black display medium 3B configured as a particle group including the positively charged black particles 3Ba are enclosed in the transparent insulating liquid 8 in the microcapsule 7, It is generated by applying a voltage between the electrode 5 (pixel electrode with TFT (thin film transistor)) provided on the side glass substrate 1 and the common electrode 6 (transparent conductive film) provided on the transparent glass substrate 2 on the observation side. The substrate is moved perpendicular to the substrates 1 and 2 according to the electric field. Then, the white display medium 3W is visually recognized by the observer as shown in FIG. 2A, or the white display is displayed by the observer, or the black display medium 3B is visually recognized by the observer as shown in FIG. Is displayed in a matrix with black and white dots.

  In this example, the resin sheet 12 is formed on the outside of the glass substrate 1 via the heat sealing material layer 11, and the transparent resin sheet 14 is formed on the outside of the transparent glass substrate 2 via the transparent heat sealing material layer 13. is doing. Reference numeral 15 denotes an adhesive. In addition, in FIG. 2 (a), (b), the partition in front is abbreviate | omitted. Here, an example is shown in which the microcapsules and the pixels (dots) correspond one-to-one.

  In the example shown in FIGS. 3A and 3B, at least two types of display media having at least two optical reflectivities and charging characteristics configured as a particle group including particles having at least optical reflectivity and chargeability ( Here, a white display medium 3W configured as a particle group including negatively charged white particles 3Wa and a black display medium 3B configured as a particle group including positively charged black particles 3Ba are shown). In each cell, a pair of pixel electrodes formed by an electrode 5 (stripe electrode) provided on the glass substrate 1 on the back side and a transparent electrode 6 (stripe electrode) provided on the transparent glass film substrate 2 on the observation side facing each other. The substrate is moved perpendicularly to the substrates 1 and 2 in accordance with an electric field generated by applying a voltage between them. A red color filter 21R, a green color filter 21G, and a blue color filter 21BL are provided on the outside of the transparent glass film substrate 2 on the observation side corresponding to each pixel via a transparent heat-sealing material layer 13, and further transparent thereon. A resin sheet 14 is formed. Furthermore, a resin sheet 12 is formed on the outside of the glass substrate 1 with a heat-bonding material layer 11 interposed therebetween. Here, the pixels and the cells are made to correspond one-to-one, the red color filter 21R, the green color filter 21G, and the blue color filter 21BL are formed corresponding to the pixels, and color display is performed with RGB3 pixels as one display unit. Yes. Reference numeral 15 denotes an adhesive for bonding the partition wall 4 and the substrate 1.

  Then, as shown in FIG. 3A, the white display medium 3W is moved to the viewer side so that the viewer can visually recognize the combined light transmitted through the red color filter 21R, the green color filter 21G, and the blue color filter 21BL. The white display is performed, or the black display medium 3B is moved to the observer side as shown in FIG. The pixel electrode pairs and the cells are arranged in a matrix in a one-to-one correspondence to perform dot matrix display. In addition, in FIG. 3 (a), (b), the partition in front is abbreviate | omitted. The transparent substrate on the observation side for forming the color filter is a thin film glass substrate, and the distance between the color filter and the display medium is as close as possible.

<Specific Configuration of Information Display Panel Targeting the Present Invention>
The information display panel according to the present invention is characterized in that the transparent conductive film surface of the observation-side transparent substrate in which the transparent conductive film is formed in the information display area and the conductive film that does not need to be transparent in the information display area are formed. The conductive film surface of the back side substrate is disposed oppositely, an electrically displayable display medium is sealed in the information display area between the two substrates, and the display medium is applied to the electrode pair formed by the opposed conductive film. Heat is applied to both sides of the information display panel precursor in which a flexible cable for connecting to the external drive circuit side for controlling and driving the display medium is mounted on the display panel unit that is electrically driven with the applied voltage and displays information. The resin sheet with the fusion material is bonded, and the periphery of the resin sheet is sealed by thermocompression bonding.

  4 (a), 4 (b), 5 (a), and 5 (b) are diagrams showing examples of specific configurations of the information display panel of the present invention. In the example shown in FIGS. 4A, 4B and 5A, 5B, the same members as those shown in FIGS. 1A, 1B to 3A, 3B are used. The same reference numerals are given to the members, and the description thereof is omitted.

  In the example shown in FIGS. 4A and 4B, a dot-matrix display system in which a flexible cable (Tape Carrier Package: also referred to as TCP) on which driver ICs are mounted on two sides extending from the stripe electrodes 5 and 6 is mounted. An information display panel including a passive drive type display panel unit is shown. In the example shown in FIGS. 4A and 4B, the flexible cable 32 with the driver IC 31 connected to the connection terminal portion on the glass substrate 2 on the observation side is sealed through the seal portion 33 made of a heat-sealing material. It extends from the lower surface of the display panel portion 34 forming the information display screen area to the outside of the heat-sealing material and is exposed to the outside. Similarly, an information display screen region is formed in which a flexible cable 36 with a driver IC 35 (back side) connected to a connection terminal portion on the glass substrate 1 on the back side is sealed through a seal portion 33 made of a heat-sealing material. The display panel unit 34 is configured to extend from the right side surface to the outside of the heat sealing material and be exposed to the outside. The example shown in FIG. 4 (b) shows a cross section along the line AA in FIG. 4 (a), and the seal portion 33 made of the heat-sealing material is formed by the heat-sealing materials 37-1, 37-2. It is composed. Reference numeral 38 denotes a sealing material provided on the outermost periphery of the display panel unit 34.

  In the example shown in FIGS. 5A and 5B, the dot matrix display type passive drive in which the stripe electrodes 5 and 6 are extended and routed to mount a flexible cable (also referred to as TCP) having a driver IC mounted on one side. An information display panel including a mold display panel unit is shown. In the example shown in FIGS. 5A and 5B, the flexible cable 32 with the driver IC 31 connected to the connection terminal portion on the glass substrate 2 on the observation side, and the connection terminal portion on the glass substrate 1 on the back side. The flexible cable 36 with the driver IC 35 (back side) connected to the terminal is heat-sealed from one side of the lower surface of the display panel portion 34 that forms the information display screen area sealed with the heat-sealing material via the seal portion 33. It extends to the outside of the material and is exposed to the outside. The example shown in FIG. 4 (b) shows a cross section along the line AA in FIG. 4 (a), and the seal portion 33 made of the heat-sealing material is attached to the heat-sealing materials 37-1, 37-2, 37-3. Reference numeral 38 denotes a sealing material provided on the outermost periphery of the display panel section 34, and reference numeral 39 denotes a wiring electrode routing area.

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

  A transparent substrate is used as the observation side panel substrate of the display panel unit. When a glass substrate is used, if the film substrate has a thickness of 200 μm or less, preferably 100 μm or less, and the back side panel substrate has a thickness of 200 μm or less, preferably 100 μm or less, it is flexible. There is a display panel that can be bent. By using a glass substrate as the substrate of the display panel unit, it is possible to suppress external moisture from entering from the panel surface. In this case, the resin sheet with a heat sealing material bonded to the outside of the information display panel precursor also functions to protect the glass substrate and prevent its damage.

  In addition to the glass substrate, the substrate may be a resin substrate such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyethersulfone (PES), polycarbonate (PC), polyimide (PI), acrylic, or the like. A metal substrate coated with an insulating film can be used. In order to obtain a thin information display panel, it is preferable to reduce the thickness of these substrates, and it is preferable to use a substrate having a thickness in the range of 25 μm to 200 μm. When a resin substrate is used, it is preferable to use a substrate provided with a silicon oxide (SiOx) film layer in order to improve moisture barrier properties.

  When the information display panel is configured as a color display type information display panel using a color filter, a transparent conductive film is formed on one surface of a transparent film substrate having a thickness of 200 μm or less, and the electrode is A color filter layer is formed on the non-formed side, and a transparent resin sheet with a transparent heat-sealing material is laminated on the outer side. The information display panel thus obtained has a laminated structure in the order of transparent conductive film / transparent film substrate having a thickness of 200 μm or less / color filter and transparent heat-sealing material / transparent resin sheet from the inside, and color display A panel for information display of the mold. The transparent resin sheet needs to be transparent, but may not be colorless and can be designed by selecting a color according to the use of the information display panel. Further, the thickness of the transparent resin sheet is adjusted within a range not affecting the visibility. If it is too thick, the light transmittance is lowered, and if it is too thin, the protection against the color filter is lowered. In the case of a double-sided display type display panel unit in which both the front side and the back side can be set as the observation side, the laminated structure on the back side is the same as that on the observation side (front side) described above.

  Further, the color filter can be formed not on the substrate on the display panel portion observation side but on a transparent resin sheet to be bonded. Also in this case, it is preferable to use a transparent substrate having a thickness of 25 μm to 200 μm as the substrate on the observation side of the display panel unit, and in terms of color visibility from an oblique direction, a thickness of 25 μm to 100 μm. It is preferable to use the substrate. As a resin sheet for forming the color filter, a resin sheet such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyethersulfone (PES), polycarbonate (PC), polyimide (PI), acrylic, or the like is used. The thickness of the resin sheet is not particularly limited, but in order to protect the display panel and the color filter, it is preferable to have a certain thickness, and from the viewpoint of visibility, a thinner one is preferable. The thickness is preferably in the range of 25 μm to 1000 μm from the viewpoint of handling properties during production. In the case where a resin substrate is used for the display panel portion, it is preferable to use a resin sheet provided with a silicon oxide (SiOx) film layer in order to enhance moisture barrier properties. A color filter is formed on one surface of a resin sheet formed by laminating the resin material layer and the silicon oxide (SiOx) film layer, and a heat sealing material is further disposed on the front surface of the color filter. You can.

  In addition, a non-transparent resin sheet may be bonded to a surface that is not the observation side among the resin sheets bonded to the display panel unit. Also in this case, resin sheets such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyethersulfone (PES), polycarbonate (PC), polyimide (PI), and acrylic are used as the resin sheet. The thickness of the resin sheet is not particularly limited, but in order to protect the display panel portion, it is preferable to have a certain thickness, considering the convenience from the viewpoint of handling at the time of manufacture, the thickness Is preferably in the range of 25 μm to 1000 μm. In the case where a resin substrate is used for the display panel portion, it is preferable to use a resin sheet provided with a silicon oxide (SiOx) film layer in order to enhance moisture barrier properties. A heat sealing material is disposed on the front surface of one surface of a resin sheet formed by laminating the resin material layer and the silicon oxide (SiOx) film layer.

  When forming a partition wall portion provided for securing a gap between two panel substrates of the display panel portion in the information display panel and a partition wall portion provided for forming a cell for storing a display medium configured as a particle group, A photolithography technique using a dry film resist material is preferably used. For example, Alfo NIT2 (manufactured by Nichigo Morton), PDF300 (manufactured by Nippon Steel Chemical Co., Ltd.), photosensitive film “Photec” (photoresist manufactured by Hitachi Chemical Co., Ltd.), etc. may be used as a dry film resist material. it can. If these dry film resist materials are blended with various pigments, a partition wall having a desired color can be obtained. The gap between the panel substrates varies depending on the type of the display medium to be used. For example, when a particle group including conductive particles is used as the display medium, the gap is 10 μm to 200 μm, preferably 10 μm to 100 μm. Accordingly, the height of the partition wall portion for securing the gap between the panel substrates is also in the above range.

  The width of the partition wall portion for securing the gap between the panel substrates is preferably in the range of 20 μm to 100 μm, and the width of the partition wall portion for forming the cell is preferably in the range of 5 μm to 30 μm.

  In the conductive film constituting the pixel arranged facing the information display area, the transparent conductive film material provided in the information display area on the transparent substrate side is indium tin oxide (ITO), indium oxide, zinc-doped indium oxide (IZO). , Aluminum doped zinc oxide (AZO), antimony tin oxide (ATO), conductive tin oxide, transparent conductive metal oxides such as conductive zinc oxide, polyaniline, polypyrrole, polythiophene, poly (3,4-ethylenedioxythiophene)- Examples thereof include transparent conductive polymers such as poly- (styrenesulfonate) (PEDOT: PSS).

  In the conductive film constituting the pixel arranged to face the information display region, the conductive film material provided in the information display region on the back substrate side may be transparent or may not be transparent. Indium tin oxide (ITO ), 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, poly (3,4-ethylenedioxythiophene) -poly- (styrenesulfonate) (PEDOT: PSS), metals such as gold, silver, copper, aluminum, nickel and chromium, and these metals An alloy having a main component can be mentioned.

  As a method for forming a conductive film provided on a panel substrate, a method of forming the above-described materials into a thin film by sputtering, vacuum deposition, CVD (chemical vapor deposition), coating, or the like, or metal foil (for example, rolled copper foil) And a method in which a conductive agent is mixed with a solvent or a synthetic resin binder and applied. The above-mentioned material that can be patterned and is electrically conductive can be preferably used. In addition, the thickness of the conductive film provided in the information display region of the observation side panel substrate may be as long as the conductivity can be secured and the light transmittance is not affected, and is preferably 0.01 μm to 10 μm, more preferably 0.05 μm to 5 μm. In addition, the thickness of the conductive film provided outside the information display area of the observation side panel substrate and the conductive film provided on the back side panel substrate only needs to ensure conductivity, and is preferably 0.01 μm to 10 μm, more preferably 0.05 μm to 5 μm. preferable.

  A metal oxide-based conductive material such as ITO suitable as a transparent conductive film is less flexible than a metal material. The metal oxide-based transparent conductive film provided in the information display area of the observation side panel substrate is preferably used in combination with a thin metal wire in order to prevent disconnection in the transparent conductive film. In particular, when the transparent conductive film is formed in a line shape, disconnection is likely to occur in the transparent conductive film, and therefore it is preferable to use it together with a fine metal wire to prevent this. The width of the fine metal wire is preferably 1 μm to 10 μm because it does not hinder display visibility. Since the conductive film provided on the back side panel substrate does not need to consider light transmittance, the metal material having low electrical resistance and excellent flexibility is preferably used. The thickness of the conductive film provided on the rear panel substrate is designed to be 0.01 μm to 10 μm from the viewpoint of electrical resistance, productivity, and cost.

<About the manufacturing method of the information display panel of this invention>
FIGS. 6A and 6B are diagrams for explaining an example of the method for manufacturing the information display panel of the present invention. In the example shown in FIGS. 6A and 6B, first, as shown in FIG. 6A, an information display panel precursor in which a flexible cable for connecting to the external drive circuit side is mounted on the display panel unit. An information display panel precursor 41 is prepared by carrying out the production steps, the heat-sealing material is embossed on one surface of the resin sheet having a larger area than the display panel portion, and the embossed trough portion is in the resin sheet width direction. A transparent resin sheet 42-1 with a heat-sealing material on the observation side, and a resin sheet-forming step with a heat-sealing material formed so as to be aligned and arranged obliquely forward from the center to the edge in the width direction, The back side resin sheet 42-2 with a heat sealing material is prepared. Next, as shown in FIG. 6 (b), the resin sheets 42-1 and 42-2 with the heat sealing material are moved to the display panel portion of the information display panel precursor 41 while pressing the heat roller. After carrying out the bonding step of bonding, the outer peripheral portions of the two resin sheets 42-1 and 42-2 with heat-bonding material bonded to the display panel portion of the information display panel precursor 41 are thermocompression bonded. The information display panel of the present invention can be obtained by performing the sealing step of sealing with the heat-sealing material crimping portion 43.

  Next, with reference to FIGS. 7A to 7C and FIGS. 8A to 8C, a specific example of the method for manufacturing the information display panel of the present invention will be described. In the examples shown in FIGS. 7A to 7C and FIGS. 8A to 8C, the same members as those shown in FIGS. 1A and 1B and FIGS. 6A and 6B are used. Are denoted by the same reference numerals, and the description thereof is omitted.

  An example of the method of manufacturing the information display panel of the present invention will be described with reference to FIGS. 7A to 7C. First, as shown in FIG. 7A, a transparent conductive film 6 (ITO stripe electrode) is formed in the information display area. The transparent conductive film surface of the transparent glass film substrate 2 on the observation side on which is formed) and the conductive film surface of the glass film substrate 1 on the back surface on which the conductive film 5 (ITO stripe electrode) is formed in the information display area are opposed to each other. As a display medium that is arranged and can be electrically driven in a cell 7 surrounded by a partition wall 4 in an information display region between two substrates 1 and 2, a negatively charged white particle group 3W and a positively charged black particle group A display panel unit 34 enclosing 3B is prepared. A sealing material 38 is disposed in the gap between the substrates 1 and 2 around the side surface of the manufactured display panel unit 34. Then, a flexible cable 32 (also referred to as TCP) with a driver IC 31 is mounted on the electrode portion obtained by extending the transparent conductive film 6 on the observation side of the display panel section 34, and the conductive film 5 on the back side of the display panel section 34 is extended. The information display panel precursor 41 is prepared by mounting the flexible cable 36 with the driver IC 35 on the electrode portion (the flexible cable 36 with the driver IC 35 on the back side on the front side of the paper is described here). Absent).

  Moreover, as shown to Fig.7 (a), the transparent heat sealing which can perform the heat sealing | fusion process at the temperature of 100 to 150 degreeC on the whole surface of one side of the transparent resin sheet 42-1 larger than the display panel part 34. 100 ° C. to 150 ° C. on one surface of a transparent resin sheet 42-1 with a heat-sealing material on the observation side formed with the material 44-1 in a predetermined embossed shape and a resin sheet 42-2 larger than the display panel unit 34. A transparent resin sheet 42-2 with a heat-sealing material on the back side, in which a heat-sealing material 44-2 that can be heat-sealed at a temperature of 0 ° C., is formed in a predetermined embossed shape. Here, the predetermined embossed shape is formed so that the valleys of the emboss are aligned and arranged obliquely forward from the center in the resin sheet width direction toward the edge in the width direction.

  Next, as shown in FIG.7 (b), the prepared transparent resin sheet 42-1 with a heat-fusion material and resin with a heat-fusion material were prepared in the panel surface of both the front and back of the prepared information display panel precursor 41. FIG. The sheets 42-2 are overlapped, and the panel surface, the resin sheet 42-1 and the resin sheet 42-2 are bonded together by a method of moving while pressing a heat roller (not shown here). Finally, as shown in FIG. 7 (c), the portions of the transparent resin sheet 42-1 with a heat sealing material and the resin sheet 42-2 with a heat sealing material that are outside the glass film substrates 1, 2 are mutually connected. The entire information display panel precursor 41 on which the flexible cable with driver IC is mounted is resin-bonded by thermocompression bonding so as to sandwich the flexible cables 32 and 36 mounted on the information display panel precursor 41. An information display panel having a structure covered with the sheets 42-1 and 42-2 can be obtained.

  In this example, the flexible cables 32 and 36 are mounted on the panel display unit 34 before the resin sheets 42-1 and 42-2 with the heat-sealing material are bonded together using a heat roller. The flexible cables 32 and 26 can be mounted after being bonded to the substrate.

  Referring to FIGS. 8A to 8C, another example of the method for manufacturing the information display panel of the present invention will be described. First, as shown in FIG. 8A, the transparent conductive film 6 (ITO) is formed in the information display area. The transparent conductive film surface of the transparent PET film substrate 2 having a thickness of 125 μm on the observation side on which the stripe electrode) is formed, and the PET having a thickness of 125 μm on the back side where the conductive film 5 (copper stripe electrode) is formed in the information display region. A negatively chargeable white particle group 3W and a positively charged white particle group 3W that can be electrically driven in a cell 7 surrounded by a partition wall 4 in an information display region between the two substrates 1 and 2 are disposed opposite to the conductive film surface of the substrate 1. A display panel unit 34 enclosing the chargeable black particle group B is prepared. In this example, three primary color filters 21R, 21G, and 21BL are formed on the transparent PET film substrate 2.

  Further, as shown in FIG. 8A, a transparent heat-sealing material 44 that can be heat-sealed at a temperature of 100 ° C. to 150 ° C. on one surface of the transparent resin sheet 42-1 that is larger than the display panel portion 34. -1 is formed into a predetermined embossed shape on one surface of the transparent resin sheet 42-1 with a heat-sealing material on the observation side and the resin sheet 42-2 larger than the display panel unit 34. A transparent resin sheet 42-2 with a heat sealing material on the back side, in which a heat sealing material 44-2 that can be heat-sealed at a temperature, is formed in a predetermined embossed shape is prepared. Here, the predetermined embossed shape is formed so that the valleys of the emboss are aligned and arranged obliquely forward from the center in the resin sheet width direction toward the edge in the width direction.

  Next, as shown in FIG. 8B, after the resin sheets 42-1 and 42-2 with the heat-sealable material are moved and bonded together while pressing the heat roller only on the PET film surface of the display panel unit 34. The flexible cable 32 with the driver IC 31 is mounted on the electrode portion obtained by extending the transparent conductive film 6 on the observation side of the display panel portion 34, and the driver is provided on the electrode portion obtained by extending the conductive film 5 on the back side of the display panel portion 34. The information display panel precursor 41 is prepared by mounting the flexible cable 36 with the IC 35 (here, the flexible cable 36 with the driver IC 35 on the back side on the front side of the paper is not described).

  Finally, as shown in FIG. 8 (c), the portions of the transparent resin sheet 42-1 with a heat-sealing material and the resin sheet 42-2 with a heat-sealing material that are outside the PET film substrates 1, 2 are mutually connected. The entire information display panel precursor 41 on which the flexible cable with driver IC is mounted is resin-bonded by thermocompression bonding so as to sandwich the flexible cables 32 and 36 mounted on the information display panel precursor 41. An information display panel capable of color display having a structure covered with the sheets 42-1 and 42-2 can be obtained.

  In this example, after the resin sheets 42-1 and 42-2 with the heat sealing material are bonded to the panel display unit 34 using a heat roller, the flexible cables 32 and 36 are mounted. The flexible cables 32 and 26 can be mounted before being attached to the substrate.

<About the embossing at the time of bonding of the resin sheet in the manufacturing method of the information display panel of this invention>
First, an example of embossing to be formed on the heat sealing material layer 44-1 of the transparent resin sheet 42-1 with heat sealing material and the heat sealing material layer 44-2 of the resin sheet 42-2 with heat sealing material. 9 (a) and 9 (b) to 11 (a) and 11 (b).

  FIGS. 9A and 9B are diagrams for explaining an example in which an embossed portion is formed on the surface of the heat-sealing material layer provided on the resin sheet. In addition, although the following example demonstrates the example which embosses to the transparent heat sealing | fusion material layer 44-1 of the transparent resin sheet 42-1, the embossing does not need to be transparent The resin sheet 42-2 This is the same when embossing is performed on the heat-sealable material layer 44-2 that does not require the transparency. In this example, first, as shown in FIG. 9A, the transparent heat-sealing material layer 44-1 is respectively formed on the transparent resin sheet 42-1, and the concavo-convex portion 52 for forming an emboss is formed on the surface in a cylindrical shape. An embossing roller plate 51 having the above is prepared. Then, the emboss forming roller plate 51 is rotated, and the rotated emboss forming roller plate 51 is pressed against the transparent heat-sealing material layer 44-1 to rotate. Thus, the embossing roller plate 51 is pressed from one end to the other end of the transparent heat-fusible material layer 44-1, and rotated to move the embossed portion on the surface as shown in FIG. 9B. The formed embossed transparent heat sealing material layer 44-1 can be formed on the transparent resin sheet 42-1. The resin sheet may be moved under the rotating roller plate so that the heat-sealable material layer is pressed.

  FIGS. 10A and 10B are diagrams for explaining another example in which an embossed portion is formed on the surface of the heat-sealing material layer provided on the resin sheet. In this example, as shown to Fig.10 (a), while preparing the transparent resin sheet 42-1, the uneven | corrugated | grooved part 52 of the roller plate 51 for emboss formation which has the uneven | corrugated | grooved part 52 for emboss formation on the surface while preparing the transparent resin sheet 42-1. A transparent heat-sealing material layer 44-1 is formed on the entire surface. Then, the embossing roller plate 51 is rotated, and the transparent heat-sealing material layer 44-1 of the rotated embossing roller plate 51 is pressed against the transparent resin sheet 42-1, and moved. Thus, as shown in FIG.10 (b), the transparent heat-fusion material layer 44-1 of the embossing roller plate 51 is pressed and moved from one end of the transparent resin sheet 42-1 to the other end. The embossed transparent heat-sealable material layer 44-1 having an embossed part formed on one surface can be disposed. The roller plate may be moved so as to roll on the fixed resin sheet.

  FIGS. 11A and 11B are views for explaining an example of the arrangement of the embossed portions of the heat-sealing material in the method for manufacturing the information display panel of the present invention. In the example shown in FIGS. 11A and 11B, the emboss pattern is schematically enlarged, and the emboss pattern includes an emboss peak 61 and an emboss valley 62 protruding upward. Yes. The embossed valleys 62 are arranged in a pattern so as to form a continuous groove in a linear shape (straight or curved). In this example, the continuous embossed valley portions 62 (grooves) are formed so as to have an angle of about 60 ° or less with respect to the roller traveling direction from the width center toward the edge. The above-mentioned range is preferable because the air layer in the embossed valley portion 62 only needs to be removed from the bonding surface to the outside, and an outlet can be formed on both sides and the distal end. In the range from over 60 ° to around 90 °, almost no outlets are formed on both sides, and a sufficient air outlet cannot be secured.

<About the bonding of the resin sheet in the manufacturing method of the information display panel of this invention>
12 (a) to 12 (f), respectively, a method of bonding a resin sheet to a panel surface of an information display panel precursor in which a flexible cable 32 is mounted on a display panel portion using an embossed heat-sealable material layer. It is a figure for demonstrating an example. In addition, although the transparent resin sheet 42-1 provided with the embossed transparent heat sealing | fusion material layer 44-1 is demonstrated in the following examples, the bonding method is a resin sheet provided with the embossed heat sealing | fusion material layer 44-2. The same applies to 42-2.

  First, as shown to Fig.12 (a), the transparent resin sheet 42-1 and the information display panel precursor 41 which formed the embossed transparent heat sealing | fusion material layer 44-1 are made into the transparent heat sealing | fusion material with embossing. The layer 44-1 and the transparent panel substrate 2 on the observation side of the information display panel precursor 41 are positioned facing each other. Then, while pressing the laminating heat roller 71 against the transparent resin sheet 42-1, it is moved horizontally as shown in FIG. As a result, as shown in FIG. 12C, a transparent resin sheet 42-1 is bonded to the transparent panel substrate 2 on the observation side of the information display panel precursor 41. The heat roller may be moved, or the panel may be moved. Next, as shown in FIG. 12 (d), the resin sheet 42-2 on which the heat-bonding material layer 44-2 with embossing and the information display panel precursor 41 are combined with the heat-bonding material layer 44 with embossing. -2 and the substrate 1 on the back side of the information display panel precursor 41 are positioned facing each other. And it is moved horizontally as shown in FIG.12 (e), pressing the heat roller 71 for lamination with respect to the resin sheet 42-2. As a result, as shown in FIG. 12 (f), the resin sheet 42-2 is bonded to the panel substrate 2 on the back side of the information display panel precursor 41. The heat roller may be moved, or the panel may be moved. Through the above steps, the resin sheet can be laminated and bonded to the observation-side and back-side panel surfaces of the display panel portion of the information display panel precursor 41.

  FIGS. 13A and 13B are diagrams for explaining an example of a method of sealing the resin sheets by bonding the resin sheets around the display panel portion of the information display panel precursor by thermocompression bonding. It is. In the example shown in FIGS. 13A and 13B, the flexible cable 32 (tape carrier package: TCP) on which the driver IC 31 is TAB mounted is mounted before the sealing material 38 is disposed, and the display panel unit 34 is mounted. An information display panel precursor in which a flexible cable 32 is mounted on the display panel portion is formed by arranging a sealing material 38 so as not to contact the extended portion of the ITO electrode 6 on the outer periphery of the substrate, and bonding the panel substrates 1 and 2 together. A body 41 is formed. A transparent resin sheet 42-1 and a heat sealing material layer 44- each having a transparent heat sealing material layer 44-1 formed on both the observation side and back side of the display panel portion of the information display panel precursor 41, respectively. After the resin sheet 42-2 having the shape 2 is arranged and laminated by using a heat roller, the outer peripheral portions of the transparent resin sheet 42-1 and the resin sheet 42-2 are sealed by thermocompression.

  In this example, as shown in FIGS. 13A and 13B, adhesive materials 72-1 and 72-2 are disposed on both sides of a flexible cable 32 (tape carrier package: TCP) on which a driver IC 31 is TAB-mounted. When the outer peripheral portions of the transparent resin sheet 42-1 on which the transparent heat sealing material layer 44-1 is formed and the resin sheet 42-2 on which the heat sealing material layer 44-2 is formed are subjected to thermocompression bonding, the TCP The portion can be surely sealed by the cooperation of the heat sealing material layers 44-1 and 44-2 and the adhesive materials 72-1 and 72-2.

  In the example shown in FIGS. 13A and 13B, the adhesive materials 72-1 and 72-2 are provided between the flexible cable 32, the transparent resin sheet 42-1 and the resin sheet 42-2. The method of providing the adhesive material is not limited to this. For example, the adhesive materials 72-1 and 72-2 have the transparent resin sheet 42-1 and the resin sheet 42- after the sealing step of the outer periphery of the resin sheet is completed. It can also be provided so as to cover the ends of the two. Thereby, the interface with a flexible cable in which heat sealing materials are not bonded together is more reliably sealed. When arrange | positioning later, you may use an insulating moisture-proof material (for example, Hitachi Chemical "TUFFY" series) instead of an adhesive material.

  Next, the heat sealing material, the resin sheet, and the sealing material used in the information display panel of the present invention described above will be described.

  The heat sealing material with an emboss pattern has a total thickness in the range of 5 μm to 10 μm, and the height of the embossed portion in the range of 1 μm to 5 μm. The embossed portion is arranged so that when laminating the resin sheets, the embossed valleys are obliquely forward from the center in the width direction toward the edge in the width direction so that air is easily discharged in the direction of roller movement by the progress of the laminating roller. It forms so that a part may align. The alignment angle is about 60 ° or less.

  As the heat-sealing material, a colorless transparent resin that softens or melts at about 100 to 150 ° C. is used. If the melting temperature exceeds 150 ° C, the transparent resin sheet or color filter may become cloudy with the heat applied to melt this resin, so it consists of a colorless transparent resin that melts in the temperature range of 100 to 150 ° C. The heat-sealable material made is used. Examples of the colorless and transparent resin include ethylene-vinyl acetate copolymer (EVA), polyester, polypropylene (PP), polyethylene resin, polyamide resin, and ethylene-ethyl acrylate copolymer resin (EEA). Use one that softens or melts at about 150 ° C.

  As the resin sheet material, a heat-resistant material such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyethersulfone (PES), polycarbonate (PC), polyimide (PI), acrylic, or the like is used. A transparent resin is used for the resin sheet material arranged outside the observation side panel substrate, but a colorless transparent resin may be used for the resin sheet material arranged outside the back side panel substrate, or a resin that is not colorless and transparent. May be used. The resin sheet material is required to have heat resistance to such an extent that it does not soften at least in the temperature range of 100 to 150 ° C. and the transparent portion does not become cloudy. The resin sheet disposed on the observation side needs to be transparent, but may not be colorless and can be designed by selecting a color according to the use of the information display panel. Further, the thickness is adjusted within a range that does not affect the visibility, and when it is desired to make a flexible information display panel, the thickness is adjusted within a range that does not impair the flexibility of the entire panel. If it is too thick, the light transmission and flexibility are lowered, and if it is too thin, the protective property is lowered.

  There are many commercially available sealing materials such as world lock 780P-45F (manufactured by Kyoritsu Chemical Industry Co., Ltd.), and these materials are used between the panel substrates of flexible panel structures. It can also be applied as a sealant, but when it is bonded to a flexible panel substrate, it shows moderate hardness and tackiness, and after completion, it is preferable that it becomes an appropriate elastic body without being too hard, so thermosetting A two-stage curable type in which a mold material and a photocurable material are combined is preferable. Among these, a thermosetting epoxy resin and a photocurable acrylic resin and / or methacrylic resin are mixed, and after passing through a gel state by a curing reaction of the acrylic resin and / or methacrylic resin, the epoxy resin A material-mixed sealant that performs a curing reaction is preferable.

  As the epoxy compound used as the sealing material, in addition to bisphenol A, derivatives of bisphenol A, bisphenol F and derivatives thereof, alicyclic type, biphenyl type, glycidyl ester type and the like are preferable. As the monofunctional epoxy compound, phenyl glycidyl ether, t-butoxyphenyl glycidyl ether, or alkyl glycidyl ether can be used.

  As monofunctional acrylic compounds, linear alkyl esters, those having a branched structure such as isobutyl and isopropyl groups, alicyclic derivatives such as cyclohexyl groups, derivatives having hydroxyl groups, carboxyl groups, and amine groups are applicable. However, considering the storage stability of the latent curing agent, it is desirable to make the structure similar to an epoxy compound, and for example, glycidyl acrylate is preferred. As the polyfunctional acrylic compound, linear or branched alkyl chain diacrylate, oligooxyethylene diacrylate, trimethylolpropane triacrylate and the like can be applied.

  Monofunctional methacrylic compounds include linear alkyl esters, those having a branched structure such as isobutyl and isopropyl groups, and alicyclic derivatives such as cyclohexyl groups, derivatives having hydroxyl groups, carboxyl groups, and amine groups. However, considering the storage stability of the latent curing agent, it is desirable to make the structure similar to an epoxy compound, and for example, glycidyl methacrylate is preferred. As the polyfunctional methacrylic compound, linear or branched alkyl chain dimethacrylate, oligooxyethylene dimethacrylate, trimethylolpropane trimethacrylate and the like can be applied.

  Hereinafter, an actual example will be described.

(Example)
In Examples 1 to 5 and Comparative Example 1 shown below, a partition wall having a height of 50 μm formed between two film substrates having a thickness of 100 μm, in which an ITO film patterned as a stripe electrode is formed on one surface. TCP was mounted on a display panel portion obtained by arranging a white display medium and a black display medium in an enclosed 300 μm × 300 μm cell and bonding them to obtain an information display panel precursor. In Examples 1 to 5, a polyethylene terephthalate (PET) having a transparent ethylene-vinyl acetate copolymer (EVA) layer (total thickness of 5 μm) formed on one surface on both sides of the precursor display panel. ) The sheets were bonded together at a laminating heat roller temperature of 100 ° C. The transparent ethylene-vinyl acetate copolymer (EVA) is a heat-sealing material. In Examples 2 to 5, the embossed valleys are embossed with a height of 2 μm, and the embossed valley portion is perpendicular to the traveling direction of the heat roller during lamination. It was arranged so as to be connected in the direction of 30 °. In Examples 1 to 5, after laminating the film substrate to the observation-side panel substrate surface and the back-side substrate surface, the outer periphery of the PET sheet was thermocompressed at 100 ° C. to seal the periphery and display information Panel was obtained. The manufactured information display panel was placed in an environment of a temperature of 30 ° C. and a humidity of 85% RH, and a test for repeatedly displaying and erasing the test pattern was performed to evaluate durability against external environmental moisture. Moreover, as the comparative example 1, the example which did not use the resin sheet with a heat sealing | fusion material was shown. The results are shown in Table 1 below.

  In addition, the size of the information display screen region of the produced information display panel precursor was equivalent to A7 size, and one TCP was mounted on each adjacent side on two panel substrates. In addition, an epoxy adhesive was disposed on all the partition walls, and an epoxy sealant was disposed around the display panel portion, and a panel substrate (film substrate) was bonded thereto. Furthermore, the black display medium and white display medium used were as follows.

(Black display medium)
60 parts by weight of methyl methacrylate monomer (Kanto Chemical Reagent) and 40 parts by weight (about 25 mol%) of ethylene glycol dimethacrylate (Wako Pure Chemical Reagent) as a polyfunctional monomer having a plurality of polymerization reactive groups in one molecule 3 parts by weight of a nigrosine compound (Bontron N07: manufactured by Orient Chemical) as a charge control agent for charging and 5 parts by weight of carbon black (special black: manufactured by Degussa) as a black pigment are dispersed by a sand mill (acrylic and methacrylic). ) After dissolving 5 parts by weight of resin-hydrocarbon resin block copolymer (Modiper F600: manufactured by NOF Corporation), a solution containing 2 parts by weight of lauryl peroxide (Perroyl L: manufactured by NOF Corporation) was dissolved in the interface. Sodium polyoxyethylene alkyl ether sulfate as activator LATEMUL E-118B (manufactured by Kao) is suspended in purified water to which 0.5% is added, polymerized, filtered and dried, and then average particle size 9 using a classifier (MDS-2: Nippon Pneumatic Industry). A group of positively charged black particles of 2 μm was obtained. In the examples, this black particle group was used as a black display medium.

(White display medium)
100 parts by weight of polymethylpentene polymer (TPX-R18: made by Mitsui Chemicals), 100 parts by weight of titanium dioxide (Taipaque CR-90: made by Ishihara Sangyo Co., Ltd.) as a colorant, and phenol-based condensation as a negative charge control agent 5 parts by weight of the product (Bontron E89: manufactured by Orient Chemical Co., Ltd.) was melt-kneaded with a twin-screw kneader and finely pulverized with a jet mill (Lab Jet Mill IDS-Lj type: Nippon Pneumatic Co., Ltd.). MDS-2: Nihon Numatic Kogyo Co., Ltd., classified and melt spheronized using a melt spheronizer (MR-10: Nihon Numatic Kogyo Co., Ltd.), with an average particle size of 9.5 μm Negatively charged white particles were obtained. In the examples, this white particle group was used as a white display medium.

  From the result of Table 1, Examples 1-5 which sealed the display panel part of the panel precursor for information displays using the resin sheet with a heat sealing material are comparative examples which did not use the resin sheet with a heat sealing material. It can be seen that, compared with 1, the environment in which the display medium is arranged can be kept the same as the initial state over a long period of time, and the same display performance can be obtained.

  In addition, if embossing is applied to the heat sealing material placed on the resin sheet to be bonded to the display panel, it can be bonded without creating bubbles at the interface between the resin sheet and the substrate of the display panel. It can be seen that a good information display panel can be obtained. Furthermore, when the outer periphery of the display panel part is thermocompression-bonded and sealed, the adhesive property and the sealing material are also disposed on the portion where the flexible cable where the heat-sealable materials do not face each other is disposed, thereby improving the sealing performance. It can be seen that the environment in which the display medium is arranged can be maintained at the same level as expected over a long period of time, and display performance that does not change can be obtained.

  Information display panels subject to the present invention include notebook computers, electronic notebooks, portable information devices called PDA (Personal Digital Assistants), display units of mobile devices such as mobile phones and handy terminals, electronic books, electronic newspapers, etc. Electronic paper, signboards, posters, bulletin boards such as blackboards (whiteboards), electronic desk calculators, display units for home appliances, automotive supplies, card display units such as point cards, IC cards, electronic advertisements, information boards, electronic POPs (Point Of Presence, Point Of Purchase advertising), electronic price tag, electronic shelf label, electronic score, display part of RF-ID equipment, as well as display part of various electronic equipment such as POS terminal, car navigation device, clock Used. In addition, rewritable paper (one that can be rewritten using an external electric field forming means having a pixel electrode pair for forming an electric field of a pixel size according to the present invention, or a connection after rewriting information by connecting to an external display rewriting means) It can also be suitably used as a device that can keep information displayed even if it is released.

DESCRIPTION OF SYMBOLS 1 Back side substrate 2 Observation side transparent substrate 3W White display medium 3Wa Negatively charged white particle 3B Black display medium 3Ba Positively charged black particle 4 Bulkhead 5 Electrode 6 Transparent electrode 7 Microcapsule 8 Transparent insulating liquid 11 Thermal fusion material Layer 12 Resin sheet 13 Transparent heat sealing material layer 14 Transparent resin sheet 15 Adhesive 21R Red color filter 21G Green color filter 21BL Blue color filter 31, 35 Driver IC
32, 36 Flexible cable 33 Thermo-compression sealing part 34 Display panel part 37-1, 37-2, 44-1, 44-2 Thermal fusion material layer 38, 43 Sealing material 39 Wiring electrode routing area 41 Information display panel precursor Body 42-1 Transparent resin sheet with heat-sealing material 42-2 Resin sheet with heat-sealing material 43 Heat-bonding material pressure-bonding part 51 Emboss-forming roller plate 52 Concavity and convexity part 61 Embossed peak part 62 Embossed valley part 71 Lamination Heat roller 72-1, 72-2 adhesive material

Claims (7)

  A display panel portion in which a conductive film is formed in a screen area for displaying information and at least one transparent substrate is formed to face each other with a gap, and a flexible cable is mounted on the display panel portion. Two sheets that are bonded to both sides of the panel precursor and the information display panel precursor by a heat sealing material, and are bonded to each other by a heat sealing material with the flexible cable sandwiched between the outer peripheral portions of the display panel portion An information display panel comprising: a resin sheet.   The information display panel according to claim 1, wherein the flexible cable includes a driver IC for controlling and driving the display panel unit.   3. The information display panel according to claim 1, wherein the display panel unit is configured in a dot matrix display system in which electrode pairs formed of the opposing conductive films are arranged in a matrix as one pixel. 4. .   The information display panel according to any one of claims 1 to 3, wherein a color filter is formed between a transparent substrate on at least the observation side of the display panel unit and a transparent resin sheet. .   The information according to any one of claims 1 to 4, wherein an adhesive material, an adhesive material, or a sealing material is disposed between the heat-sealable material surface of the resin sheet and the flexible cable surface. Display panel.   It is a manufacturing method of the information display panel of any one of Claims 1-5, Comprising: The information display panel precursor preparation step which mounts a flexible cable in a display panel part, and a larger area than a display panel part Heat-sealing that forms a heat-sealing material on one side of the resin sheet in an embossed fashion, with the embossed troughs aligned diagonally forward from the center in the width direction of the resin sheet toward the edge in the width direction A resin sheet forming step with a material, a bonding step in which a resin sheet with a heat sealing material is positioned on the substrate surface of the display panel unit and then moved while pressing the heat roller, and two heat sealing materials And a sealing step for sealing the outer peripheral portion of the attached resin sheet by thermocompression bonding.   7. The information according to claim 6, wherein the heat-sealing material layer provided in an embossed shape on one surface of the resin sheet has an embossed height of 1 μm to 5 μm and a total thickness of 5 μm to 10 μm. Manufacturing method of display panel.

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